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------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- S E M _ C H 1 3 --
-- --
-- B o d y --
-- --
-- Copyright (C) 1992-2018, Free Software Foundation, Inc. --
-- --
-- GNAT is free software; you can redistribute it and/or modify it under --
-- terms of the GNU General Public License as published by the Free Soft- --
-- ware Foundation; either version 3, or (at your option) any later ver- --
-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
-- for more details. You should have received a copy of the GNU General --
-- Public License distributed with GNAT; see file COPYING3. If not, go to --
-- http://www.gnu.org/licenses for a complete copy of the license. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
with Aspects; use Aspects;
with Atree; use Atree;
with Checks; use Checks;
with Debug; use Debug;
with Einfo; use Einfo;
with Elists; use Elists;
with Errout; use Errout;
with Expander; use Expander;
with Exp_Disp; use Exp_Disp;
with Exp_Tss; use Exp_Tss;
with Exp_Util; use Exp_Util;
with Freeze; use Freeze;
with Ghost; use Ghost;
with Lib; use Lib;
with Lib.Xref; use Lib.Xref;
with Namet; use Namet;
with Nlists; use Nlists;
with Nmake; use Nmake;
with Opt; use Opt;
with Par_SCO; use Par_SCO;
with Restrict; use Restrict;
with Rident; use Rident;
with Rtsfind; use Rtsfind;
with Sem; use Sem;
with Sem_Aux; use Sem_Aux;
with Sem_Case; use Sem_Case;
with Sem_Ch3; use Sem_Ch3;
with Sem_Ch6; use Sem_Ch6;
with Sem_Ch7; use Sem_Ch7;
with Sem_Ch8; use Sem_Ch8;
with Sem_Dim; use Sem_Dim;
with Sem_Disp; use Sem_Disp;
with Sem_Eval; use Sem_Eval;
with Sem_Prag; use Sem_Prag;
with Sem_Res; use Sem_Res;
with Sem_Type; use Sem_Type;
with Sem_Util; use Sem_Util;
with Sem_Warn; use Sem_Warn;
with Sinfo; use Sinfo;
with Sinput; use Sinput;
with Snames; use Snames;
with Stand; use Stand;
with Targparm; use Targparm;
with Ttypes; use Ttypes;
with Tbuild; use Tbuild;
with Urealp; use Urealp;
with Warnsw; use Warnsw;
with GNAT.Heap_Sort_G;
package body Sem_Ch13 is
SSU : constant Pos := System_Storage_Unit;
-- Convenient short hand for commonly used constant
-----------------------
-- Local Subprograms --
-----------------------
procedure Adjust_Record_For_Reverse_Bit_Order_Ada_95 (R : Entity_Id);
-- Helper routine providing the original (pre-AI95-0133) behavior for
-- Adjust_Record_For_Reverse_Bit_Order.
procedure Alignment_Check_For_Size_Change (Typ : Entity_Id; Size : Uint);
-- This routine is called after setting one of the sizes of type entity
-- Typ to Size. The purpose is to deal with the situation of a derived
-- type whose inherited alignment is no longer appropriate for the new
-- size value. In this case, we reset the Alignment to unknown.
procedure Build_Discrete_Static_Predicate
(Typ : Entity_Id;
Expr : Node_Id;
Nam : Name_Id);
-- Given a predicated type Typ, where Typ is a discrete static subtype,
-- whose predicate expression is Expr, tests if Expr is a static predicate,
-- and if so, builds the predicate range list. Nam is the name of the one
-- argument to the predicate function. Occurrences of the type name in the
-- predicate expression have been replaced by identifier references to this
-- name, which is unique, so any identifier with Chars matching Nam must be
-- a reference to the type. If the predicate is non-static, this procedure
-- returns doing nothing. If the predicate is static, then the predicate
-- list is stored in Static_Discrete_Predicate (Typ), and the Expr is
-- rewritten as a canonicalized membership operation.
function Build_Export_Import_Pragma
(Asp : Node_Id;
Id : Entity_Id) return Node_Id;
-- Create the corresponding pragma for aspect Export or Import denoted by
-- Asp. Id is the related entity subject to the aspect. Return Empty when
-- the expression of aspect Asp evaluates to False or is erroneous.
function Build_Predicate_Function_Declaration
(Typ : Entity_Id) return Node_Id;
-- Build the declaration for a predicate function. The declaration is built
-- at the end of the declarative part containing the type definition, which
-- may be before the freeze point of the type. The predicate expression is
-- pre-analyzed at this point, to catch visibility errors.
procedure Build_Predicate_Functions (Typ : Entity_Id; N : Node_Id);
-- If Typ has predicates (indicated by Has_Predicates being set for Typ),
-- then either there are pragma Predicate entries on the rep chain for the
-- type (note that Predicate aspects are converted to pragma Predicate), or
-- there are inherited aspects from a parent type, or ancestor subtypes.
-- This procedure builds body for the Predicate function that tests these
-- predicates. N is the freeze node for the type. The spec of the function
-- is inserted before the freeze node, and the body of the function is
-- inserted after the freeze node. If the predicate expression has a least
-- one Raise_Expression, then this procedure also builds the M version of
-- the predicate function for use in membership tests.
procedure Check_Pool_Size_Clash (Ent : Entity_Id; SP, SS : Node_Id);
-- Called if both Storage_Pool and Storage_Size attribute definition
-- clauses (SP and SS) are present for entity Ent. Issue error message.
procedure Freeze_Entity_Checks (N : Node_Id);
-- Called from Analyze_Freeze_Entity and Analyze_Generic_Freeze Entity
-- to generate appropriate semantic checks that are delayed until this
-- point (they had to be delayed this long for cases of delayed aspects,
-- e.g. analysis of statically predicated subtypes in choices, for which
-- we have to be sure the subtypes in question are frozen before checking).
function Get_Alignment_Value (Expr : Node_Id) return Uint;
-- Given the expression for an alignment value, returns the corresponding
-- Uint value. If the value is inappropriate, then error messages are
-- posted as required, and a value of No_Uint is returned.
function Is_Operational_Item (N : Node_Id) return Boolean;
-- A specification for a stream attribute is allowed before the full type
-- is declared, as explained in AI-00137 and the corrigendum. Attributes
-- that do not specify a representation characteristic are operational
-- attributes.
function Is_Predicate_Static
(Expr : Node_Id;
Nam : Name_Id) return Boolean;
-- Given predicate expression Expr, tests if Expr is predicate-static in
-- the sense of the rules in (RM 3.2.4 (15-24)). Occurrences of the type
-- name in the predicate expression have been replaced by references to
-- an identifier whose Chars field is Nam. This name is unique, so any
-- identifier with Chars matching Nam must be a reference to the type.
-- Returns True if the expression is predicate-static and False otherwise,
-- but is not in the business of setting flags or issuing error messages.
--
-- Only scalar types can have static predicates, so False is always
-- returned for non-scalar types.
--
-- Note: the RM seems to suggest that string types can also have static
-- predicates. But that really makes lttle sense as very few useful
-- predicates can be constructed for strings. Remember that:
--
-- "ABC" < "DEF"
--
-- is not a static expression. So even though the clearly faulty RM wording
-- allows the following:
--
-- subtype S is String with Static_Predicate => S < "DEF"
--
-- We can't allow this, otherwise we have predicate-static applying to a
-- larger class than static expressions, which was never intended.
procedure New_Stream_Subprogram
(N : Node_Id;
Ent : Entity_Id;
Subp : Entity_Id;
Nam : TSS_Name_Type);
-- Create a subprogram renaming of a given stream attribute to the
-- designated subprogram and then in the tagged case, provide this as a
-- primitive operation, or in the untagged case make an appropriate TSS
-- entry. This is more properly an expansion activity than just semantics,
-- but the presence of user-defined stream functions for limited types
-- is a legality check, which is why this takes place here rather than in
-- exp_ch13, where it was previously. Nam indicates the name of the TSS
-- function to be generated.
--
-- To avoid elaboration anomalies with freeze nodes, for untagged types
-- we generate both a subprogram declaration and a subprogram renaming
-- declaration, so that the attribute specification is handled as a
-- renaming_as_body. For tagged types, the specification is one of the
-- primitive specs.
procedure Register_Address_Clause_Check
(N : Node_Id;
X : Entity_Id;
A : Uint;
Y : Entity_Id;
Off : Boolean);
-- Register a check for the address clause N. The rest of the parameters
-- are in keeping with the components of Address_Clause_Check_Record below.
procedure Resolve_Iterable_Operation
(N : Node_Id;
Cursor : Entity_Id;
Typ : Entity_Id;
Nam : Name_Id);
-- If the name of a primitive operation for an Iterable aspect is
-- overloaded, resolve according to required signature.
procedure Set_Biased
(E : Entity_Id;
N : Node_Id;
Msg : String;
Biased : Boolean := True);
-- If Biased is True, sets Has_Biased_Representation flag for E, and
-- outputs a warning message at node N if Warn_On_Biased_Representation is
-- is True. This warning inserts the string Msg to describe the construct
-- causing biasing.
---------------------------------------------------
-- Table for Validate_Compile_Time_Warning_Error --
---------------------------------------------------
-- The following table collects pragmas Compile_Time_Error and Compile_
-- Time_Warning for validation. Entries are made by calls to subprogram
-- Validate_Compile_Time_Warning_Error, and the call to the procedure
-- Validate_Compile_Time_Warning_Errors does the actual error checking
-- and posting of warning and error messages. The reason for this delayed
-- processing is to take advantage of back-annotations of attributes size
-- and alignment values performed by the back end.
-- Note: the reason we store a Source_Ptr value instead of a Node_Id is
-- that by the time Validate_Unchecked_Conversions is called, Sprint will
-- already have modified all Sloc values if the -gnatD option is set.
type CTWE_Entry is record
Eloc : Source_Ptr;
-- Source location used in warnings and error messages
Prag : Node_Id;
-- Pragma Compile_Time_Error or Compile_Time_Warning
Scope : Node_Id;
-- The scope which encloses the pragma
end record;
package Compile_Time_Warnings_Errors is new Table.Table (
Table_Component_Type => CTWE_Entry,
Table_Index_Type => Int,
Table_Low_Bound => 1,
Table_Initial => 50,
Table_Increment => 200,
Table_Name => "Compile_Time_Warnings_Errors");
----------------------------------------------
-- Table for Validate_Unchecked_Conversions --
----------------------------------------------
-- The following table collects unchecked conversions for validation.
-- Entries are made by Validate_Unchecked_Conversion and then the call
-- to Validate_Unchecked_Conversions does the actual error checking and
-- posting of warnings. The reason for this delayed processing is to take
-- advantage of back-annotations of size and alignment values performed by
-- the back end.
-- Note: the reason we store a Source_Ptr value instead of a Node_Id is
-- that by the time Validate_Unchecked_Conversions is called, Sprint will
-- already have modified all Sloc values if the -gnatD option is set.
type UC_Entry is record
Eloc : Source_Ptr; -- node used for posting warnings
Source : Entity_Id; -- source type for unchecked conversion
Target : Entity_Id; -- target type for unchecked conversion
Act_Unit : Entity_Id; -- actual function instantiated
end record;
package Unchecked_Conversions is new Table.Table (
Table_Component_Type => UC_Entry,
Table_Index_Type => Int,
Table_Low_Bound => 1,
Table_Initial => 50,
Table_Increment => 200,
Table_Name => "Unchecked_Conversions");
----------------------------------------
-- Table for Validate_Address_Clauses --
----------------------------------------
-- If an address clause has the form
-- for X'Address use Expr
-- where Expr has a value known at compile time or is of the form Y'Address
-- or recursively is a reference to a constant initialized with either of
-- these forms, and the value of Expr is not a multiple of X's alignment,
-- or if Y has a smaller alignment than X, then that merits a warning about
-- possible bad alignment. The following table collects address clauses of
-- this kind. We put these in a table so that they can be checked after the
-- back end has completed annotation of the alignments of objects, since we
-- can catch more cases that way.
type Address_Clause_Check_Record is record
N : Node_Id;
-- The address clause
X : Entity_Id;
-- The entity of the object subject to the address clause
A : Uint;
-- The value of the address in the first case
Y : Entity_Id;
-- The entity of the object being overlaid in the second case
Off : Boolean;
-- Whether the address is offset within Y in the second case
Alignment_Checks_Suppressed : Boolean;
-- Whether alignment checks are suppressed by an active scope suppress
-- setting. We need to save the value in order to be able to reuse it
-- after the back end has been run.
end record;
package Address_Clause_Checks is new Table.Table (
Table_Component_Type => Address_Clause_Check_Record,
Table_Index_Type => Int,
Table_Low_Bound => 1,
Table_Initial => 20,
Table_Increment => 200,
Table_Name => "Address_Clause_Checks");
function Alignment_Checks_Suppressed
(ACCR : Address_Clause_Check_Record) return Boolean;
-- Return whether the alignment check generated for the address clause
-- is suppressed.
---------------------------------
-- Alignment_Checks_Suppressed --
---------------------------------
function Alignment_Checks_Suppressed
(ACCR : Address_Clause_Check_Record) return Boolean
is
begin
if Checks_May_Be_Suppressed (ACCR.X) then
return Is_Check_Suppressed (ACCR.X, Alignment_Check);
else
return ACCR.Alignment_Checks_Suppressed;
end if;
end Alignment_Checks_Suppressed;
-----------------------------------------
-- Adjust_Record_For_Reverse_Bit_Order --
-----------------------------------------
procedure Adjust_Record_For_Reverse_Bit_Order (R : Entity_Id) is
Max_Machine_Scalar_Size : constant Uint :=
UI_From_Int
(Standard_Long_Long_Integer_Size);
-- We use this as the maximum machine scalar size
SSU : constant Uint := UI_From_Int (System_Storage_Unit);
CC : Node_Id;
Comp : Node_Id;
Num_CC : Natural;
begin
-- Processing here used to depend on Ada version: the behavior was
-- changed by AI95-0133. However this AI is a Binding interpretation,
-- so we now implement it even in Ada 95 mode. The original behavior
-- from unamended Ada 95 is still available for compatibility under
-- debugging switch -gnatd.
if Ada_Version < Ada_2005 and then Debug_Flag_Dot_P then
Adjust_Record_For_Reverse_Bit_Order_Ada_95 (R);
return;
end if;
-- For Ada 2005, we do machine scalar processing, as fully described In
-- AI-133. This involves gathering all components which start at the
-- same byte offset and processing them together. Same approach is still
-- valid in later versions including Ada 2012.
-- This first loop through components does two things. First it deals
-- with the case of components with component clauses whose length is
-- greater than the maximum machine scalar size (either accepting them
-- or rejecting as needed). Second, it counts the number of components
-- with component clauses whose length does not exceed this maximum for
-- later processing.
Num_CC := 0;
Comp := First_Component_Or_Discriminant (R);
while Present (Comp) loop
CC := Component_Clause (Comp);
if Present (CC) then
declare
Fbit : constant Uint := Static_Integer (First_Bit (CC));
Lbit : constant Uint := Static_Integer (Last_Bit (CC));
begin
-- Case of component with last bit >= max machine scalar
if Lbit >= Max_Machine_Scalar_Size then
-- This is allowed only if first bit is zero, and last bit
-- + 1 is a multiple of storage unit size.
if Fbit = 0 and then (Lbit + 1) mod SSU = 0 then
-- This is the case to give a warning if enabled
if Warn_On_Reverse_Bit_Order then
Error_Msg_N
("info: multi-byte field specified with "
& "non-standard Bit_Order?V?", CC);
if Bytes_Big_Endian then
Error_Msg_N
("\bytes are not reversed "
& "(component is big-endian)?V?", CC);
else
Error_Msg_N
("\bytes are not reversed "
& "(component is little-endian)?V?", CC);
end if;
end if;
-- Give error message for RM 13.5.1(10) violation
else
Error_Msg_FE
("machine scalar rules not followed for&",
First_Bit (CC), Comp);
Error_Msg_Uint_1 := Lbit + 1;
Error_Msg_Uint_2 := Max_Machine_Scalar_Size;
Error_Msg_F
("\last bit + 1 (^) exceeds maximum machine scalar "
& "size (^)", First_Bit (CC));
if (Lbit + 1) mod SSU /= 0 then
Error_Msg_Uint_1 := SSU;
Error_Msg_F
("\and is not a multiple of Storage_Unit (^) "
& "(RM 13.5.1(10))", First_Bit (CC));
else
Error_Msg_Uint_1 := Fbit;
Error_Msg_F
("\and first bit (^) is non-zero "
& "(RM 13.4.1(10))", First_Bit (CC));
end if;
end if;
-- OK case of machine scalar related component clause. For now,
-- just count them.
else
Num_CC := Num_CC + 1;
end if;
end;
end if;
Next_Component_Or_Discriminant (Comp);
end loop;
-- We need to sort the component clauses on the basis of the Position
-- values in the clause, so we can group clauses with the same Position
-- together to determine the relevant machine scalar size.
Sort_CC : declare
Comps : array (0 .. Num_CC) of Entity_Id;
-- Array to collect component and discriminant entities. The data
-- starts at index 1, the 0'th entry is for the sort routine.
function CP_Lt (Op1, Op2 : Natural) return Boolean;
-- Compare routine for Sort
procedure CP_Move (From : Natural; To : Natural);
-- Move routine for Sort
package Sorting is new GNAT.Heap_Sort_G (CP_Move, CP_Lt);
MaxL : Uint;
-- Maximum last bit value of any component in this set
MSS : Uint;
-- Corresponding machine scalar size
Start : Natural;
Stop : Natural;
-- Start and stop positions in the component list of the set of
-- components with the same starting position (that constitute
-- components in a single machine scalar).
-----------
-- CP_Lt --
-----------
function CP_Lt (Op1, Op2 : Natural) return Boolean is
begin
return
Position (Component_Clause (Comps (Op1))) <
Position (Component_Clause (Comps (Op2)));
end CP_Lt;
-------------
-- CP_Move --
-------------
procedure CP_Move (From : Natural; To : Natural) is
begin
Comps (To) := Comps (From);
end CP_Move;
-- Start of processing for Sort_CC
begin
-- Collect the machine scalar relevant component clauses
Num_CC := 0;
Comp := First_Component_Or_Discriminant (R);
while Present (Comp) loop
declare
CC : constant Node_Id := Component_Clause (Comp);
begin
-- Collect only component clauses whose last bit is less than
-- machine scalar size. Any component clause whose last bit
-- exceeds this value does not take part in machine scalar
-- layout considerations. The test for Error_Posted makes sure
-- we exclude component clauses for which we already posted an
-- error.
if Present (CC)
and then not Error_Posted (Last_Bit (CC))
and then Static_Integer (Last_Bit (CC)) <
Max_Machine_Scalar_Size
then
Num_CC := Num_CC + 1;
Comps (Num_CC) := Comp;
end if;
end;
Next_Component_Or_Discriminant (Comp);
end loop;
-- Sort by ascending position number
Sorting.Sort (Num_CC);
-- We now have all the components whose size does not exceed the max
-- machine scalar value, sorted by starting position. In this loop we
-- gather groups of clauses starting at the same position, to process
-- them in accordance with AI-133.
Stop := 0;
while Stop < Num_CC loop
Start := Stop + 1;
Stop := Start;
MaxL :=
Static_Integer
(Last_Bit (Component_Clause (Comps (Start))));
while Stop < Num_CC loop
if Static_Integer
(Position (Component_Clause (Comps (Stop + 1)))) =
Static_Integer
(Position (Component_Clause (Comps (Stop))))
then
Stop := Stop + 1;
MaxL :=
UI_Max
(MaxL,
Static_Integer
(Last_Bit
(Component_Clause (Comps (Stop)))));
else
exit;
end if;
end loop;
-- Now we have a group of component clauses from Start to Stop
-- whose positions are identical, and MaxL is the maximum last
-- bit value of any of these components.
-- We need to determine the corresponding machine scalar size.
-- This loop assumes that machine scalar sizes are even, and that
-- each possible machine scalar has twice as many bits as the next
-- smaller one.
MSS := Max_Machine_Scalar_Size;
while MSS mod 2 = 0
and then (MSS / 2) >= SSU
and then (MSS / 2) > MaxL
loop
MSS := MSS / 2;
end loop;
-- Here is where we fix up the Component_Bit_Offset value to
-- account for the reverse bit order. Some examples of what needs
-- to be done for the case of a machine scalar size of 8 are:
-- First_Bit .. Last_Bit Component_Bit_Offset
-- old new old new
-- 0 .. 0 7 .. 7 0 7
-- 0 .. 1 6 .. 7 0 6
-- 0 .. 2 5 .. 7 0 5
-- 0 .. 7 0 .. 7 0 4
-- 1 .. 1 6 .. 6 1 6
-- 1 .. 4 3 .. 6 1 3
-- 4 .. 7 0 .. 3 4 0
-- The rule is that the first bit is obtained by subtracting the
-- old ending bit from machine scalar size - 1.
for C in Start .. Stop loop
declare
Comp : constant Entity_Id := Comps (C);
CC : constant Node_Id := Component_Clause (Comp);
LB : constant Uint := Static_Integer (Last_Bit (CC));
NFB : constant Uint := MSS - Uint_1 - LB;
NLB : constant Uint := NFB + Esize (Comp) - 1;
Pos : constant Uint := Static_Integer (Position (CC));
begin
if Warn_On_Reverse_Bit_Order then
Error_Msg_Uint_1 := MSS;
Error_Msg_N
("info: reverse bit order in machine scalar of "
& "length^?V?", First_Bit (CC));
Error_Msg_Uint_1 := NFB;
Error_Msg_Uint_2 := NLB;
if Bytes_Big_Endian then
Error_Msg_NE
("\big-endian range for component & is ^ .. ^?V?",
First_Bit (CC), Comp);
else
Error_Msg_NE
("\little-endian range for component & is ^ .. ^?V?",
First_Bit (CC), Comp);
end if;
end if;
Set_Component_Bit_Offset (Comp, Pos * SSU + NFB);
Set_Normalized_Position (Comp, Pos + NFB / SSU);
Set_Normalized_First_Bit (Comp, NFB mod SSU);
end;
end loop;
end loop;
end Sort_CC;
end Adjust_Record_For_Reverse_Bit_Order;
------------------------------------------------
-- Adjust_Record_For_Reverse_Bit_Order_Ada_95 --
------------------------------------------------
procedure Adjust_Record_For_Reverse_Bit_Order_Ada_95 (R : Entity_Id) is
CC : Node_Id;
Comp : Node_Id;
begin
-- For Ada 95, we just renumber bits within a storage unit. We do the
-- same for Ada 83 mode, since we recognize the Bit_Order attribute in
-- Ada 83, and are free to add this extension.
Comp := First_Component_Or_Discriminant (R);
while Present (Comp) loop
CC := Component_Clause (Comp);
-- If component clause is present, then deal with the non-default
-- bit order case for Ada 95 mode.
-- We only do this processing for the base type, and in fact that
-- is important, since otherwise if there are record subtypes, we
-- could reverse the bits once for each subtype, which is wrong.
if Present (CC) and then Ekind (R) = E_Record_Type then
declare
CFB : constant Uint := Component_Bit_Offset (Comp);
CSZ : constant Uint := Esize (Comp);
CLC : constant Node_Id := Component_Clause (Comp);
Pos : constant Node_Id := Position (CLC);
FB : constant Node_Id := First_Bit (CLC);
Storage_Unit_Offset : constant Uint :=
CFB / System_Storage_Unit;
Start_Bit : constant Uint :=
CFB mod System_Storage_Unit;
begin
-- Cases where field goes over storage unit boundary
if Start_Bit + CSZ > System_Storage_Unit then
-- Allow multi-byte field but generate warning
if Start_Bit mod System_Storage_Unit = 0
and then CSZ mod System_Storage_Unit = 0
then
Error_Msg_N
("info: multi-byte field specified with non-standard "
& "Bit_Order?V?", CLC);
if Bytes_Big_Endian then
Error_Msg_N
("\bytes are not reversed "
& "(component is big-endian)?V?", CLC);
else
Error_Msg_N
("\bytes are not reversed "
& "(component is little-endian)?V?", CLC);
end if;
-- Do not allow non-contiguous field
else
Error_Msg_N
("attempt to specify non-contiguous field not "
& "permitted", CLC);
Error_Msg_N
("\caused by non-standard Bit_Order specified in "
& "legacy Ada 95 mode", CLC);
end if;
-- Case where field fits in one storage unit
else
-- Give warning if suspicious component clause
if Intval (FB) >= System_Storage_Unit
and then Warn_On_Reverse_Bit_Order
then
Error_Msg_N
("info: Bit_Order clause does not affect byte "
& "ordering?V?", Pos);
Error_Msg_Uint_1 :=
Intval (Pos) + Intval (FB) /
System_Storage_Unit;
Error_Msg_N
("info: position normalized to ^ before bit order "
& "interpreted?V?", Pos);
end if;
-- Here is where we fix up the Component_Bit_Offset value
-- to account for the reverse bit order. Some examples of
-- what needs to be done are:
-- First_Bit .. Last_Bit Component_Bit_Offset
-- old new old new
-- 0 .. 0 7 .. 7 0 7
-- 0 .. 1 6 .. 7 0 6
-- 0 .. 2 5 .. 7 0 5
-- 0 .. 7 0 .. 7 0 4
-- 1 .. 1 6 .. 6 1 6
-- 1 .. 4 3 .. 6 1 3
-- 4 .. 7 0 .. 3 4 0
-- The rule is that the first bit is is obtained by
-- subtracting the old ending bit from storage_unit - 1.
Set_Component_Bit_Offset (Comp,
(Storage_Unit_Offset * System_Storage_Unit) +
(System_Storage_Unit - 1) -
(Start_Bit + CSZ - 1));
Set_Normalized_Position (Comp,
Component_Bit_Offset (Comp) / System_Storage_Unit);
Set_Normalized_First_Bit (Comp,
Component_Bit_Offset (Comp) mod System_Storage_Unit);
end if;
end;
end if;
Next_Component_Or_Discriminant (Comp);
end loop;
end Adjust_Record_For_Reverse_Bit_Order_Ada_95;
-------------------------------------
-- Alignment_Check_For_Size_Change --
-------------------------------------
procedure Alignment_Check_For_Size_Change (Typ : Entity_Id; Size : Uint) is
begin
-- If the alignment is known, and not set by a rep clause, and is
-- inconsistent with the size being set, then reset it to unknown,
-- we assume in this case that the size overrides the inherited
-- alignment, and that the alignment must be recomputed.
if Known_Alignment (Typ)
and then not Has_Alignment_Clause (Typ)
and then Size mod (Alignment (Typ) * SSU) /= 0
then
Init_Alignment (Typ);
end if;
end Alignment_Check_For_Size_Change;
-------------------------------------
-- Analyze_Aspects_At_Freeze_Point --
-------------------------------------
procedure Analyze_Aspects_At_Freeze_Point (E : Entity_Id) is
procedure Analyze_Aspect_Default_Value (ASN : Node_Id);
-- This routine analyzes an Aspect_Default_[Component_]Value denoted by
-- the aspect specification node ASN.
procedure Inherit_Delayed_Rep_Aspects (ASN : Node_Id);
-- As discussed in the spec of Aspects (see Aspect_Delay declaration),
-- a derived type can inherit aspects from its parent which have been
-- specified at the time of the derivation using an aspect, as in:
--
-- type A is range 1 .. 10
-- with Size => Not_Defined_Yet;
-- ..
-- type B is new A;
-- ..
-- Not_Defined_Yet : constant := 64;
--
-- In this example, the Size of A is considered to be specified prior
-- to the derivation, and thus inherited, even though the value is not
-- known at the time of derivation. To deal with this, we use two entity
-- flags. The flag Has_Derived_Rep_Aspects is set in the parent type (A
-- here), and then the flag May_Inherit_Delayed_Rep_Aspects is set in
-- the derived type (B here). If this flag is set when the derived type
-- is frozen, then this procedure is called to ensure proper inheritance
-- of all delayed aspects from the parent type. The derived type is E,
-- the argument to Analyze_Aspects_At_Freeze_Point. ASN is the first
-- aspect specification node in the Rep_Item chain for the parent type.
procedure Make_Pragma_From_Boolean_Aspect (ASN : Node_Id);
-- Given an aspect specification node ASN whose expression is an
-- optional Boolean, this routines creates the corresponding pragma
-- at the freezing point.
----------------------------------
-- Analyze_Aspect_Default_Value --
----------------------------------
procedure Analyze_Aspect_Default_Value (ASN : Node_Id) is
A_Id : constant Aspect_Id := Get_Aspect_Id (ASN);
Ent : constant Entity_Id := Entity (ASN);
Expr : constant Node_Id := Expression (ASN);
Id : constant Node_Id := Identifier (ASN);
begin
Error_Msg_Name_1 := Chars (Id);
if not Is_Type (Ent) then
Error_Msg_N ("aspect% can only apply to a type", Id);
return;
elsif not Is_First_Subtype (Ent) then
Error_Msg_N ("aspect% cannot apply to subtype", Id);
return;
elsif A_Id = Aspect_Default_Value
and then not Is_Scalar_Type (Ent)
then
Error_Msg_N ("aspect% can only be applied to scalar type", Id);
return;
elsif A_Id = Aspect_Default_Component_Value then
if not Is_Array_Type (Ent) then
Error_Msg_N ("aspect% can only be applied to array type", Id);
return;
elsif not Is_Scalar_Type (Component_Type (Ent)) then
Error_Msg_N ("aspect% requires scalar components", Id);
return;
end if;
end if;
Set_Has_Default_Aspect (Base_Type (Ent));
if Is_Scalar_Type (Ent) then
Set_Default_Aspect_Value (Base_Type (Ent), Expr);
else
Set_Default_Aspect_Component_Value (Base_Type (Ent), Expr);
end if;
end Analyze_Aspect_Default_Value;
---------------------------------
-- Inherit_Delayed_Rep_Aspects --
---------------------------------
procedure Inherit_Delayed_Rep_Aspects (ASN : Node_Id) is
A_Id : constant Aspect_Id := Get_Aspect_Id (ASN);
P : constant Entity_Id := Entity (ASN);
-- Entithy for parent type
N : Node_Id;
-- Item from Rep_Item chain
A : Aspect_Id;
begin
-- Loop through delayed aspects for the parent type
N := ASN;
while Present (N) loop
if Nkind (N) = N_Aspect_Specification then
exit when Entity (N) /= P;
if Is_Delayed_Aspect (N) then
A := Get_Aspect_Id (Chars (Identifier (N)));
-- Process delayed rep aspect. For Boolean attributes it is
-- not possible to cancel an attribute once set (the attempt
-- to use an aspect with xxx => False is an error) for a
-- derived type. So for those cases, we do not have to check
-- if a clause has been given for the derived type, since it
-- is harmless to set it again if it is already set.
case A is
-- Alignment
when Aspect_Alignment =>
if not Has_Alignment_Clause (E) then
Set_Alignment (E, Alignment (P));
end if;
-- Atomic
when Aspect_Atomic =>
if Is_Atomic (P) then
Set_Is_Atomic (E);
end if;
-- Atomic_Components
when Aspect_Atomic_Components =>
if Has_Atomic_Components (P) then
Set_Has_Atomic_Components (Base_Type (E));
end if;
-- Bit_Order
when Aspect_Bit_Order =>
if Is_Record_Type (E)
and then No (Get_Attribute_Definition_Clause
(E, Attribute_Bit_Order))
and then Reverse_Bit_Order (P)
then
Set_Reverse_Bit_Order (Base_Type (E));
end if;
-- Component_Size
when Aspect_Component_Size =>
if Is_Array_Type (E)
and then not Has_Component_Size_Clause (E)
then
Set_Component_Size
(Base_Type (E), Component_Size (P));
end if;
-- Machine_Radix
when Aspect_Machine_Radix =>
if Is_Decimal_Fixed_Point_Type (E)
and then not Has_Machine_Radix_Clause (E)
then
Set_Machine_Radix_10 (E, Machine_Radix_10 (P));
end if;
-- Object_Size (also Size which also sets Object_Size)
when Aspect_Object_Size
| Aspect_Size
=>
if not Has_Size_Clause (E)
and then
No (Get_Attribute_Definition_Clause
(E, Attribute_Object_Size))
then
Set_Esize (E, Esize (P));
end if;
-- Pack
when Aspect_Pack =>
if not Is_Packed (E) then
Set_Is_Packed (Base_Type (E));
if Is_Bit_Packed_Array (P) then
Set_Is_Bit_Packed_Array (Base_Type (E));
Set_Packed_Array_Impl_Type
(E, Packed_Array_Impl_Type (P));
end if;
end if;
-- Scalar_Storage_Order
when Aspect_Scalar_Storage_Order =>
if (Is_Record_Type (E) or else Is_Array_Type (E))
and then No (Get_Attribute_Definition_Clause
(E, Attribute_Scalar_Storage_Order))
and then Reverse_Storage_Order (P)
then
Set_Reverse_Storage_Order (Base_Type (E));
-- Clear default SSO indications, since the aspect
-- overrides the default.
Set_SSO_Set_Low_By_Default (Base_Type (E), False);
Set_SSO_Set_High_By_Default (Base_Type (E), False);
end if;
-- Small
when Aspect_Small =>
if Is_Fixed_Point_Type (E)
and then not Has_Small_Clause (E)
then
Set_Small_Value (E, Small_Value (P));
end if;
-- Storage_Size
when Aspect_Storage_Size =>
if (Is_Access_Type (E) or else Is_Task_Type (E))
and then not Has_Storage_Size_Clause (E)
then
Set_Storage_Size_Variable
(Base_Type (E), Storage_Size_Variable (P));
end if;
-- Value_Size
when Aspect_Value_Size =>
-- Value_Size is never inherited, it is either set by
-- default, or it is explicitly set for the derived
-- type. So nothing to do here.
null;
-- Volatile
when Aspect_Volatile =>
if Is_Volatile (P) then
Set_Is_Volatile (E);
end if;
-- Volatile_Full_Access
when Aspect_Volatile_Full_Access =>
if Is_Volatile_Full_Access (P) then
Set_Is_Volatile_Full_Access (E);
end if;
-- Volatile_Components
when Aspect_Volatile_Components =>
if Has_Volatile_Components (P) then
Set_Has_Volatile_Components (Base_Type (E));
end if;
-- That should be all the Rep Aspects
when others =>
pragma Assert (Aspect_Delay (A_Id) /= Rep_Aspect);
null;
end case;
end if;
end if;
N := Next_Rep_Item (N);
end loop;
end Inherit_Delayed_Rep_Aspects;
-------------------------------------
-- Make_Pragma_From_Boolean_Aspect --
-------------------------------------
procedure Make_Pragma_From_Boolean_Aspect (ASN : Node_Id) is
Ident : constant Node_Id := Identifier (ASN);
A_Name : constant Name_Id := Chars (Ident);
A_Id : constant Aspect_Id := Get_Aspect_Id (A_Name);
Ent : constant Entity_Id := Entity (ASN);
Expr : constant Node_Id := Expression (ASN);
Loc : constant Source_Ptr := Sloc (ASN);
procedure Check_False_Aspect_For_Derived_Type;
-- This procedure checks for the case of a false aspect for a derived
-- type, which improperly tries to cancel an aspect inherited from
-- the parent.
-----------------------------------------
-- Check_False_Aspect_For_Derived_Type --
-----------------------------------------
procedure Check_False_Aspect_For_Derived_Type is
Par : Node_Id;
begin
-- We are only checking derived types
if not Is_Derived_Type (E) then
return;
end if;
Par := Nearest_Ancestor (E);
case A_Id is
when Aspect_Atomic
| Aspect_Shared
=>
if not Is_Atomic (Par) then
return;
end if;
when Aspect_Atomic_Components =>
if not Has_Atomic_Components (Par) then
return;
end if;
when Aspect_Discard_Names =>
if not Discard_Names (Par) then
return;
end if;
when Aspect_Pack =>
if not Is_Packed (Par) then
return;
end if;
when Aspect_Unchecked_Union =>
if not Is_Unchecked_Union (Par) then
return;
end if;
when Aspect_Volatile =>
if not Is_Volatile (Par) then
return;
end if;
when Aspect_Volatile_Components =>
if not Has_Volatile_Components (Par) then
return;
end if;
when Aspect_Volatile_Full_Access =>
if not Is_Volatile_Full_Access (Par) then
return;
end if;
when others =>
return;
end case;
-- Fall through means we are canceling an inherited aspect
Error_Msg_Name_1 := A_Name;
Error_Msg_NE
("derived type& inherits aspect%, cannot cancel", Expr, E);
end Check_False_Aspect_For_Derived_Type;
-- Local variables
Prag : Node_Id;
-- Start of processing for Make_Pragma_From_Boolean_Aspect
begin
-- Note that we know Expr is present, because for a missing Expr
-- argument, we knew it was True and did not need to delay the
-- evaluation to the freeze point.
if Is_False (Static_Boolean (Expr)) then
Check_False_Aspect_For_Derived_Type;
else
Prag :=
Make_Pragma (Loc,
Pragma_Identifier =>
Make_Identifier (Sloc (Ident), Chars (Ident)),
Pragma_Argument_Associations => New_List (
Make_Pragma_Argument_Association (Sloc (Ident),
Expression => New_Occurrence_Of (Ent, Sloc (Ident)))));
Set_From_Aspect_Specification (Prag, True);
Set_Corresponding_Aspect (Prag, ASN);
Set_Aspect_Rep_Item (ASN, Prag);
Set_Is_Delayed_Aspect (Prag);
Set_Parent (Prag, ASN);
end if;
end Make_Pragma_From_Boolean_Aspect;
-- Local variables
A_Id : Aspect_Id;
ASN : Node_Id;
Ritem : Node_Id;
-- Start of processing for Analyze_Aspects_At_Freeze_Point
begin
-- Must be visible in current scope, but if this is a type from a nested
-- package it may be frozen from an object declaration in the enclosing
-- scope, so install the package declarations to complete the analysis
-- of the aspects, if any. If the package itself is frozen the type will
-- have been frozen as well.
if not Scope_Within_Or_Same (Current_Scope, Scope (E)) then
if Is_Type (E) and then From_Nested_Package (E) then
declare
Pack : constant Entity_Id := Scope (E);
begin
Push_Scope (Pack);
Install_Visible_Declarations (Pack);
Install_Private_Declarations (Pack);
Analyze_Aspects_At_Freeze_Point (E);
if Is_Private_Type (E)
and then Present (Full_View (E))
then
Analyze_Aspects_At_Freeze_Point (Full_View (E));
end if;
End_Package_Scope (Pack);
return;
end;
-- Aspects from other entities in different contexts are analyzed
-- elsewhere.
else
return;
end if;
end if;
-- Look for aspect specification entries for this entity
ASN := First_Rep_Item (E);
while Present (ASN) loop
if Nkind (ASN) = N_Aspect_Specification then
exit when Entity (ASN) /= E;
if Is_Delayed_Aspect (ASN) then
A_Id := Get_Aspect_Id (ASN);
case A_Id is
-- For aspects whose expression is an optional Boolean, make
-- the corresponding pragma at the freeze point.
when Boolean_Aspects
| Library_Unit_Aspects
=>
-- Aspects Export and Import require special handling.
-- Both are by definition Boolean and may benefit from
-- forward references, however their expressions are
-- treated as static. In addition, the syntax of their
-- corresponding pragmas requires extra "pieces" which
-- may also contain forward references. To account for
-- all of this, the corresponding pragma is created by
-- Analyze_Aspect_Export_Import, but is not analyzed as
-- the complete analysis must happen now.
if A_Id = Aspect_Export or else A_Id = Aspect_Import then
null;
-- Otherwise create a corresponding pragma
else
Make_Pragma_From_Boolean_Aspect (ASN);
end if;
-- Special handling for aspects that don't correspond to
-- pragmas/attributes.
when Aspect_Default_Value
| Aspect_Default_Component_Value
=>
-- Do not inherit aspect for anonymous base type of a
-- scalar or array type, because they apply to the first
-- subtype of the type, and will be processed when that
-- first subtype is frozen.
if Is_Derived_Type (E)
and then not Comes_From_Source (E)
and then E /= First_Subtype (E)
then
null;
else
Analyze_Aspect_Default_Value (ASN);
end if;
-- Ditto for iterator aspects, because the corresponding
-- attributes may not have been analyzed yet.
when Aspect_Constant_Indexing
| Aspect_Default_Iterator
| Aspect_Iterator_Element
| Aspect_Variable_Indexing
=>
Analyze (Expression (ASN));
if Etype (Expression (ASN)) = Any_Type then
Error_Msg_NE
("\aspect must be fully defined before & is frozen",
ASN, E);
end if;
when Aspect_Iterable =>
Validate_Iterable_Aspect (E, ASN);
when others =>
null;
end case;
Ritem := Aspect_Rep_Item (ASN);
if Present (Ritem) then
Analyze (Ritem);
end if;
end if;
end if;
Next_Rep_Item (ASN);
end loop;
-- This is where we inherit delayed rep aspects from our parent. Note
-- that if we fell out of the above loop with ASN non-empty, it means
-- we hit an aspect for an entity other than E, and it must be the
-- type from which we were derived.
if May_Inherit_Delayed_Rep_Aspects (E) then
Inherit_Delayed_Rep_Aspects (ASN);
end if;
end Analyze_Aspects_At_Freeze_Point;
-----------------------------------
-- Analyze_Aspect_Specifications --
-----------------------------------
procedure Analyze_Aspect_Specifications (N : Node_Id; E : Entity_Id) is
pragma Assert (Present (E));
procedure Decorate (Asp : Node_Id; Prag : Node_Id);
-- Establish linkages between an aspect and its corresponding pragma
procedure Insert_Pragma
(Prag : Node_Id;
Is_Instance : Boolean := False);
-- Subsidiary to the analysis of aspects
-- Abstract_State
-- Attach_Handler
-- Contract_Cases
-- Depends
-- Ghost
-- Global
-- Initial_Condition
-- Initializes
-- Post
-- Pre
-- Refined_Depends
-- Refined_Global
-- Refined_State
-- SPARK_Mode
-- Warnings
-- Insert pragma Prag such that it mimics the placement of a source
-- pragma of the same kind. Flag Is_Generic should be set when the
-- context denotes a generic instance.
--------------
-- Decorate --
--------------
procedure Decorate (Asp : Node_Id; Prag : Node_Id) is
begin
Set_Aspect_Rep_Item (Asp, Prag);
Set_Corresponding_Aspect (Prag, Asp);
Set_From_Aspect_Specification (Prag);
Set_Parent (Prag, Asp);
end Decorate;
-------------------
-- Insert_Pragma --
-------------------
procedure Insert_Pragma
(Prag : Node_Id;
Is_Instance : Boolean := False)
is
Aux : Node_Id;
Decl : Node_Id;
Decls : List_Id;
Def : Node_Id;
Inserted : Boolean := False;
begin
-- When the aspect appears on an entry, package, protected unit,
-- subprogram, or task unit body, insert the generated pragma at the
-- top of the body declarations to emulate the behavior of a source
-- pragma.
-- package body Pack with Aspect is
-- package body Pack is
-- pragma Prag;
if Nkind_In (N, N_Entry_Body,
N_Package_Body,
N_Protected_Body,
N_Subprogram_Body,
N_Task_Body)
then
Decls := Declarations (N);
if No (Decls) then
Decls := New_List;
Set_Declarations (N, Decls);
end if;
Prepend_To (Decls, Prag);
-- When the aspect is associated with a [generic] package declaration
-- insert the generated pragma at the top of the visible declarations
-- to emulate the behavior of a source pragma.
-- package Pack with Aspect is
-- package Pack is
-- pragma Prag;
elsif Nkind_In (N, N_Generic_Package_Declaration,
N_Package_Declaration)
then
Decls := Visible_Declarations (Specification (N));
if No (Decls) then
Decls := New_List;
Set_Visible_Declarations (Specification (N), Decls);
end if;
-- The visible declarations of a generic instance have the
-- following structure:
-- <renamings of generic formals>
-- <renamings of internally-generated spec and body>
-- <first source declaration>
-- Insert the pragma before the first source declaration by
-- skipping the instance "header" to ensure proper visibility of
-- all formals.
if Is_Instance then
Decl := First (Decls);
while Present (Decl) loop
if Comes_From_Source (Decl) then
Insert_Before (Decl, Prag);
Inserted := True;
exit;
else
Next (Decl);
end if;
end loop;
-- The pragma is placed after the instance "header"
if not Inserted then
Append_To (Decls, Prag);
end if;
-- Otherwise this is not a generic instance
else
Prepend_To (Decls, Prag);
end if;
-- When the aspect is associated with a protected unit declaration,
-- insert the generated pragma at the top of the visible declarations
-- the emulate the behavior of a source pragma.
-- protected [type] Prot with Aspect is
-- protected [type] Prot is
-- pragma Prag;
elsif Nkind (N) = N_Protected_Type_Declaration then
Def := Protected_Definition (N);
if No (Def) then
Def :=
Make_Protected_Definition (Sloc (N),
Visible_Declarations => New_List,
End_Label => Empty);
Set_Protected_Definition (N, Def);
end if;
Decls := Visible_Declarations (Def);
if No (Decls) then
Decls := New_List;
Set_Visible_Declarations (Def, Decls);
end if;
Prepend_To (Decls, Prag);
-- When the aspect is associated with a task unit declaration, insert
-- insert the generated pragma at the top of the visible declarations
-- the emulate the behavior of a source pragma.
-- task [type] Prot with Aspect is
-- task [type] Prot is
-- pragma Prag;
elsif Nkind (N) = N_Task_Type_Declaration then
Def := Task_Definition (N);
if No (Def) then
Def :=
Make_Task_Definition (Sloc (N),
Visible_Declarations => New_List,
End_Label => Empty);
Set_Task_Definition (N, Def);
end if;
Decls := Visible_Declarations (Def);
if No (Decls) then
Decls := New_List;
Set_Visible_Declarations (Def, Decls);
end if;
Prepend_To (Decls, Prag);
-- When the context is a library unit, the pragma is added to the
-- Pragmas_After list.
elsif Nkind (Parent (N)) = N_Compilation_Unit then
Aux := Aux_Decls_Node (Parent (N));
if No (Pragmas_After (Aux)) then
Set_Pragmas_After (Aux, New_List);
end if;
Prepend (Prag, Pragmas_After (Aux));
-- Default, the pragma is inserted after the context
else
Insert_After (N, Prag);
end if;
end Insert_Pragma;
-- Local variables
Aspect : Node_Id;
Aitem : Node_Id;
Ent : Node_Id;
L : constant List_Id := Aspect_Specifications (N);
pragma Assert (Present (L));
Ins_Node : Node_Id := N;
-- Insert pragmas/attribute definition clause after this node when no
-- delayed analysis is required.
-- Start of processing for Analyze_Aspect_Specifications
begin
-- The general processing involves building an attribute definition
-- clause or a pragma node that corresponds to the aspect. Then in order
-- to delay the evaluation of this aspect to the freeze point, we attach
-- the corresponding pragma/attribute definition clause to the aspect
-- specification node, which is then placed in the Rep Item chain. In
-- this case we mark the entity by setting the flag Has_Delayed_Aspects
-- and we evaluate the rep item at the freeze point. When the aspect
-- doesn't have a corresponding pragma/attribute definition clause, then
-- its analysis is simply delayed at the freeze point.
-- Some special cases don't require delay analysis, thus the aspect is
-- analyzed right now.
-- Note that there is a special handling for Pre, Post, Test_Case,
-- Contract_Cases aspects. In these cases, we do not have to worry
-- about delay issues, since the pragmas themselves deal with delay
-- of visibility for the expression analysis. Thus, we just insert
-- the pragma after the node N.
-- Loop through aspects
Aspect := First (L);
Aspect_Loop : while Present (Aspect) loop
Analyze_One_Aspect : declare
Expr : constant Node_Id := Expression (Aspect);
Id : constant Node_Id := Identifier (Aspect);
Loc : constant Source_Ptr := Sloc (Aspect);
Nam : constant Name_Id := Chars (Id);
A_Id : constant Aspect_Id := Get_Aspect_Id (Nam);
Anod : Node_Id;
Delay_Required : Boolean;
-- Set False if delay is not required
Eloc : Source_Ptr := No_Location;
-- Source location of expression, modified when we split PPC's. It
-- is set below when Expr is present.
procedure Analyze_Aspect_Convention;
-- Perform analysis of aspect Convention
procedure Analyze_Aspect_Disable_Controlled;
-- Perform analysis of aspect Disable_Controlled
procedure Analyze_Aspect_Export_Import;
-- Perform analysis of aspects Export or Import
procedure Analyze_Aspect_External_Link_Name;
-- Perform analysis of aspects External_Name or Link_Name
procedure Analyze_Aspect_Implicit_Dereference;
-- Perform analysis of the Implicit_Dereference aspects
procedure Make_Aitem_Pragma
(Pragma_Argument_Associations : List_Id;
Pragma_Name : Name_Id);
-- This is a wrapper for Make_Pragma used for converting aspects
-- to pragmas. It takes care of Sloc (set from Loc) and building
-- the pragma identifier from the given name. In addition the
-- flags Class_Present and Split_PPC are set from the aspect
-- node, as well as Is_Ignored. This routine also sets the
-- From_Aspect_Specification in the resulting pragma node to
-- True, and sets Corresponding_Aspect to point to the aspect.
-- The resulting pragma is assigned to Aitem.
-------------------------------
-- Analyze_Aspect_Convention --
-------------------------------
procedure Analyze_Aspect_Convention is
Conv : Node_Id;
Dummy_1 : Node_Id;
Dummy_2 : Node_Id;
Dummy_3 : Node_Id;
Expo : Node_Id;
Imp : Node_Id;
begin
-- Obtain all interfacing aspects that apply to the related
-- entity.
Get_Interfacing_Aspects
(Iface_Asp => Aspect,
Conv_Asp => Dummy_1,
EN_Asp => Dummy_2,
Expo_Asp => Expo,
Imp_Asp => Imp,
LN_Asp => Dummy_3,
Do_Checks => True);
-- The related entity is subject to aspect Export or Import.
-- Do not process Convention now because it must be analysed
-- as part of Export or Import.
if Present (Expo) or else Present (Imp) then
return;
-- Otherwise Convention appears by itself
else
-- The aspect specifies a particular convention
if Present (Expr) then
Conv := New_Copy_Tree (Expr);
-- Otherwise assume convention Ada
else
Conv := Make_Identifier (Loc, Name_Ada);
end if;
-- Generate:
-- pragma Convention (<Conv>, <E>);
Make_Aitem_Pragma
(Pragma_Name => Name_Convention,
Pragma_Argument_Associations => New_List (
Make_Pragma_Argument_Association (Loc,
Expression => Conv),
Make_Pragma_Argument_Association (Loc,
Expression => New_Occurrence_Of (E, Loc))));
Decorate (Aspect, Aitem);
Insert_Pragma (Aitem);
end if;
end Analyze_Aspect_Convention;
---------------------------------------
-- Analyze_Aspect_Disable_Controlled --
---------------------------------------
procedure Analyze_Aspect_Disable_Controlled is
begin
-- The aspect applies only to controlled records
if not (Ekind (E) = E_Record_Type
and then Is_Controlled_Active (E))
then
Error_Msg_N
("aspect % requires controlled record type", Aspect);
return;
end if;
-- Preanalyze the expression (if any) when the aspect resides
-- in a generic unit.
if Inside_A_Generic then
if Present (Expr) then
Preanalyze_And_Resolve (Expr, Any_Boolean);
end if;
-- Otherwise the aspect resides in a nongeneric context
else
-- A controlled record type loses its controlled semantics
-- when the expression statically evaluates to True.
if Present (Expr) then
Analyze_And_Resolve (Expr, Any_Boolean);
if Is_OK_Static_Expression (Expr) then
if Is_True (Static_Boolean (Expr)) then
Set_Disable_Controlled (E);
end if;
-- Otherwise the expression is not static
else
Error_Msg_N
("expression of aspect % must be static", Aspect);
end if;
-- Otherwise the aspect appears without an expression and
-- defaults to True.
else
Set_Disable_Controlled (E);
end if;
end if;
end Analyze_Aspect_Disable_Controlled;
----------------------------------
-- Analyze_Aspect_Export_Import --
----------------------------------
procedure Analyze_Aspect_Export_Import is
Dummy_1 : Node_Id;
Dummy_2 : Node_Id;
Dummy_3 : Node_Id;
Expo : Node_Id;
Imp : Node_Id;
begin
-- Obtain all interfacing aspects that apply to the related
-- entity.
Get_Interfacing_Aspects
(Iface_Asp => Aspect,
Conv_Asp => Dummy_1,
EN_Asp => Dummy_2,
Expo_Asp => Expo,
Imp_Asp => Imp,
LN_Asp => Dummy_3,
Do_Checks => True);
-- The related entity cannot be subject to both aspects Export
-- and Import.
if Present (Expo) and then Present (Imp) then
Error_Msg_N
("incompatible interfacing aspects given for &", E);
Error_Msg_Sloc := Sloc (Expo);
Error_Msg_N ("\aspect `Export` #", E);
Error_Msg_Sloc := Sloc (Imp);
Error_Msg_N ("\aspect `Import` #", E);
end if;
-- A variable is most likely modified from the outside. Take
-- the optimistic approach to avoid spurious errors.
if Ekind (E) = E_Variable then
Set_Never_Set_In_Source (E, False);
end if;
-- Resolve the expression of an Import or Export here, and
-- require it to be of type Boolean and static. This is not
-- quite right, because in general this should be delayed,
-- but that seems tricky for these, because normally Boolean
-- aspects are replaced with pragmas at the freeze point in
-- Make_Pragma_From_Boolean_Aspect.
if not Present (Expr)
or else Is_True (Static_Boolean (Expr))
then
if A_Id = Aspect_Import then
Set_Has_Completion (E);
Set_Is_Imported (E);
-- An imported object cannot be explicitly initialized
if Nkind (N) = N_Object_Declaration
and then Present (Expression (N))
then
Error_Msg_N
("imported entities cannot be initialized "
& "(RM B.1(24))", Expression (N));
end if;
else
pragma Assert (A_Id = Aspect_Export);
Set_Is_Exported (E);
end if;
-- Create the proper form of pragma Export or Import taking
-- into account Conversion, External_Name, and Link_Name.
Aitem := Build_Export_Import_Pragma (Aspect, E);
-- Otherwise the expression is either False or erroneous. There
-- is no corresponding pragma.
else
Aitem := Empty;
end if;
end Analyze_Aspect_Export_Import;
---------------------------------------
-- Analyze_Aspect_External_Link_Name --
---------------------------------------
procedure Analyze_Aspect_External_Link_Name is
Dummy_1 : Node_Id;
Dummy_2 : Node_Id;
Dummy_3 : Node_Id;
Expo : Node_Id;
Imp : Node_Id;
begin
-- Obtain all interfacing aspects that apply to the related
-- entity.
Get_Interfacing_Aspects
(Iface_Asp => Aspect,
Conv_Asp => Dummy_1,
EN_Asp => Dummy_2,
Expo_Asp => Expo,
Imp_Asp => Imp,
LN_Asp => Dummy_3,
Do_Checks => True);
-- Ensure that aspect External_Name applies to aspect Export or
-- Import.
if A_Id = Aspect_External_Name then
if No (Expo) and then No (Imp) then
Error_Msg_N
("aspect `External_Name` requires aspect `Import` or "
& "`Export`", Aspect);
end if;
-- Otherwise ensure that aspect Link_Name applies to aspect
-- Export or Import.
else
pragma Assert (A_Id = Aspect_Link_Name);
if No (Expo) and then No (Imp) then
Error_Msg_N
("aspect `Link_Name` requires aspect `Import` or "
& "`Export`", Aspect);
end if;
end if;
end Analyze_Aspect_External_Link_Name;
-----------------------------------------
-- Analyze_Aspect_Implicit_Dereference --
-----------------------------------------
procedure Analyze_Aspect_Implicit_Dereference is
begin
if not Is_Type (E) or else not Has_Discriminants (E) then
Error_Msg_N
("aspect must apply to a type with discriminants", Expr);
elsif not Is_Entity_Name (Expr) then
Error_Msg_N
("aspect must name a discriminant of current type", Expr);
else
-- Discriminant type be an anonymous access type or an
-- anonymous access to subprogram.
-- Missing synchronized types???
declare
Disc : Entity_Id := First_Discriminant (E);
begin
while Present (Disc) loop
if Chars (Expr) = Chars (Disc)
and then Ekind_In
(Etype (Disc),
E_Anonymous_Access_Subprogram_Type,
E_Anonymous_Access_Type)
then
Set_Has_Implicit_Dereference (E);
Set_Has_Implicit_Dereference (Disc);
exit;
end if;
Next_Discriminant (Disc);
end loop;
-- Error if no proper access discriminant
if Present (Disc) then
-- For a type extension, check whether parent has
-- a reference discriminant, to verify that use is
-- proper.
if Is_Derived_Type (E)
and then Has_Discriminants (Etype (E))
then
declare
Parent_Disc : constant Entity_Id :=
Get_Reference_Discriminant (Etype (E));
begin
if Present (Parent_Disc)
and then Corresponding_Discriminant (Disc) /=
Parent_Disc
then
Error_Msg_N
("reference discriminant does not match "
& "discriminant of parent type", Expr);
end if;
end;
end if;
else
Error_Msg_NE
("not an access discriminant of&", Expr, E);
end if;
end;
end if;
end Analyze_Aspect_Implicit_Dereference;
-----------------------
-- Make_Aitem_Pragma --
-----------------------
procedure Make_Aitem_Pragma
(Pragma_Argument_Associations : List_Id;
Pragma_Name : Name_Id)
is
Args : List_Id := Pragma_Argument_Associations;
begin
-- We should never get here if aspect was disabled
pragma Assert (not Is_Disabled (Aspect));
-- Certain aspects allow for an optional name or expression. Do
-- not generate a pragma with empty argument association list.
if No (Args) or else No (Expression (First (Args))) then
Args := No_List;
end if;
-- Build the pragma
Aitem :=
Make_Pragma (Loc,
Pragma_Argument_Associations => Args,
Pragma_Identifier =>
Make_Identifier (Sloc (Id), Pragma_Name),
Class_Present => Class_Present (Aspect),
Split_PPC => Split_PPC (Aspect));
-- Set additional semantic fields
if Is_Ignored (Aspect) then
Set_Is_Ignored (Aitem);
elsif Is_Checked (Aspect) then
Set_Is_Checked (Aitem);
end if;
Set_Corresponding_Aspect (Aitem, Aspect);
Set_From_Aspect_Specification (Aitem);
end Make_Aitem_Pragma;
-- Start of processing for Analyze_One_Aspect
begin
-- Skip aspect if already analyzed, to avoid looping in some cases
if Analyzed (Aspect) then
goto Continue;
end if;
-- Skip looking at aspect if it is totally disabled. Just mark it
-- as such for later reference in the tree. This also sets the
-- Is_Ignored and Is_Checked flags appropriately.
Check_Applicable_Policy (Aspect);
if Is_Disabled (Aspect) then
goto Continue;
end if;
-- Set the source location of expression, used in the case of
-- a failed precondition/postcondition or invariant. Note that
-- the source location of the expression is not usually the best
-- choice here. For example, it gets located on the last AND
-- keyword in a chain of boolean expressiond AND'ed together.
-- It is best to put the message on the first character of the
-- assertion, which is the effect of the First_Node call here.
if Present (Expr) then
Eloc := Sloc (First_Node (Expr));
end if;
-- Check restriction No_Implementation_Aspect_Specifications
if Implementation_Defined_Aspect (A_Id) then
Check_Restriction
(No_Implementation_Aspect_Specifications, Aspect);
end if;
-- Check restriction No_Specification_Of_Aspect
Check_Restriction_No_Specification_Of_Aspect (Aspect);
-- Mark aspect analyzed (actual analysis is delayed till later)
Set_Analyzed (Aspect);
Set_Entity (Aspect, E);
-- Build the reference to E that will be used in the built pragmas
Ent := New_Occurrence_Of (E, Sloc (Id));
if A_Id = Aspect_Attach_Handler
or else A_Id = Aspect_Interrupt_Handler
then
-- Treat the specification as a reference to the protected
-- operation, which might otherwise appear unreferenced and
-- generate spurious warnings.
Generate_Reference (E, Id);
end if;
-- Check for duplicate aspect. Note that the Comes_From_Source
-- test allows duplicate Pre/Post's that we generate internally
-- to escape being flagged here.
if No_Duplicates_Allowed (A_Id) then
Anod := First (L);
while Anod /= Aspect loop
if Comes_From_Source (Aspect)
and then Same_Aspect (A_Id, Get_Aspect_Id (Anod))
then
Error_Msg_Name_1 := Nam;
Error_Msg_Sloc := Sloc (Anod);
-- Case of same aspect specified twice
if Class_Present (Anod) = Class_Present (Aspect) then
if not Class_Present (Anod) then
Error_Msg_NE
("aspect% for & previously given#",
Id, E);
else
Error_Msg_NE
("aspect `%''Class` for & previously given#",
Id, E);
end if;
end if;
end if;
Next (Anod);
end loop;
end if;
-- Check some general restrictions on language defined aspects
if not Implementation_Defined_Aspect (A_Id) then
Error_Msg_Name_1 := Nam;
-- Not allowed for renaming declarations. Examine the original
-- node because a subprogram renaming may have been rewritten
-- as a body.
if Nkind (Original_Node (N)) in N_Renaming_Declaration then
Error_Msg_N
("aspect % not allowed for renaming declaration",
Aspect);
end if;
-- Not allowed for formal type declarations
if Nkind (N) = N_Formal_Type_Declaration then
Error_Msg_N
("aspect % not allowed for formal type declaration",
Aspect);
end if;
end if;
-- Copy expression for later processing by the procedures
-- Check_Aspect_At_[Freeze_Point | End_Of_Declarations]
Set_Entity (Id, New_Copy_Tree (Expr));
-- Set Delay_Required as appropriate to aspect
case Aspect_Delay (A_Id) is
when Always_Delay =>
Delay_Required := True;
when Never_Delay =>
Delay_Required := False;
when Rep_Aspect =>
-- If expression has the form of an integer literal, then
-- do not delay, since we know the value cannot change.
-- This optimization catches most rep clause cases.
-- For Boolean aspects, don't delay if no expression
if A_Id in Boolean_Aspects and then No (Expr) then
Delay_Required := False;
-- For non-Boolean aspects, don't delay if integer literal,
-- unless the aspect is Alignment, which affects the
-- freezing of an initialized object.
elsif A_Id not in Boolean_Aspects
and then A_Id /= Aspect_Alignment
and then Present (Expr)
and then Nkind (Expr) = N_Integer_Literal
then
Delay_Required := False;
-- All other cases are delayed
else
Delay_Required := True;
Set_Has_Delayed_Rep_Aspects (E);
end if;
end case;
-- Processing based on specific aspect
case A_Id is
when Aspect_Unimplemented =>
null; -- ??? temp for now
-- No_Aspect should be impossible
when No_Aspect =>
raise Program_Error;
-- Case 1: Aspects corresponding to attribute definition
-- clauses.
when Aspect_Address
| Aspect_Alignment
| Aspect_Bit_Order
| Aspect_Component_Size
| Aspect_Constant_Indexing
| Aspect_Default_Iterator
| Aspect_Dispatching_Domain
| Aspect_External_Tag
| Aspect_Input
| Aspect_Iterable
| Aspect_Iterator_Element
| Aspect_Machine_Radix
| Aspect_Object_Size
| Aspect_Output
| Aspect_Read
| Aspect_Scalar_Storage_Order
| Aspect_Simple_Storage_Pool
| Aspect_Size
| Aspect_Small
| Aspect_Storage_Pool
| Aspect_Stream_Size
| Aspect_Value_Size
| Aspect_Variable_Indexing
| Aspect_Write
=>
-- Indexing aspects apply only to tagged type
if (A_Id = Aspect_Constant_Indexing
or else
A_Id = Aspect_Variable_Indexing)
and then not (Is_Type (E)
and then Is_Tagged_Type (E))
then
Error_Msg_N
("indexing aspect can only apply to a tagged type",
Aspect);
goto Continue;
end if;
-- For the case of aspect Address, we don't consider that we
-- know the entity is never set in the source, since it is
-- is likely aliasing is occurring.
-- Note: one might think that the analysis of the resulting
-- attribute definition clause would take care of that, but
-- that's not the case since it won't be from source.
if A_Id = Aspect_Address then
Set_Never_Set_In_Source (E, False);
end if;
-- Correctness of the profile of a stream operation is
-- verified at the freeze point, but we must detect the
-- illegal specification of this aspect for a subtype now,
-- to prevent malformed rep_item chains.
if A_Id = Aspect_Input or else
A_Id = Aspect_Output or else
A_Id = Aspect_Read or else
A_Id = Aspect_Write
then
if not Is_First_Subtype (E) then
Error_Msg_N
("local name must be a first subtype", Aspect);
goto Continue;
-- If stream aspect applies to the class-wide type,
-- the generated attribute definition applies to the
-- class-wide type as well.
elsif Class_Present (Aspect) then
Ent :=
Make_Attribute_Reference (Loc,
Prefix => Ent,
Attribute_Name => Name_Class);
end if;
end if;
-- Construct the attribute_definition_clause. The expression
-- in the aspect specification is simply shared with the
-- constructed attribute, because it will be fully analyzed
-- when the attribute is processed. However, in ASIS mode
-- the aspect expression itself is preanalyzed and resolved
-- to catch visibility errors that are otherwise caught
-- later, and we create a separate copy of the expression
-- to prevent analysis of a malformed tree (e.g. a function
-- call with parameter associations).
if ASIS_Mode then
Aitem :=
Make_Attribute_Definition_Clause (Loc,
Name => Ent,
Chars => Chars (Id),
Expression => New_Copy_Tree (Expr));
else
Aitem :=
Make_Attribute_Definition_Clause (Loc,
Name => Ent,
Chars => Chars (Id),
Expression => Relocate_Node (Expr));
end if;
-- If the address is specified, then we treat the entity as
-- referenced, to avoid spurious warnings. This is analogous
-- to what is done with an attribute definition clause, but
-- here we don't want to generate a reference because this
-- is the point of definition of the entity.
if A_Id = Aspect_Address then
Set_Referenced (E);
end if;
-- Case 2: Aspects corresponding to pragmas
-- Case 2a: Aspects corresponding to pragmas with two
-- arguments, where the first argument is a local name
-- referring to the entity, and the second argument is the
-- aspect definition expression.
-- Linker_Section/Suppress/Unsuppress
when Aspect_Linker_Section
| Aspect_Suppress
| Aspect_Unsuppress
=>
Make_Aitem_Pragma
(Pragma_Argument_Associations => New_List (
Make_Pragma_Argument_Association (Loc,
Expression => New_Occurrence_Of (E, Loc)),
Make_Pragma_Argument_Association (Sloc (Expr),
Expression => Relocate_Node (Expr))),
Pragma_Name => Chars (Id));
-- Linker_Section does not need delaying, as its argument
-- must be a static string. Furthermore, if applied to
-- an object with an explicit initialization, the object
-- must be frozen in order to elaborate the initialization
-- code. (This is already done for types with implicit
-- initialization, such as protected types.)
if A_Id = Aspect_Linker_Section
and then Nkind (N) = N_Object_Declaration
and then Has_Init_Expression (N)
then
Delay_Required := False;
end if;
-- Synchronization
-- Corresponds to pragma Implemented, construct the pragma
when Aspect_Synchronization =>
Make_Aitem_Pragma
(Pragma_Argument_Associations => New_List (
Make_Pragma_Argument_Association (Loc,
Expression => New_Occurrence_Of (E, Loc)),
Make_Pragma_Argument_Association (Sloc (Expr),
Expression => Relocate_Node (Expr))),
Pragma_Name => Name_Implemented);
-- Attach_Handler
when Aspect_Attach_Handler =>
Make_Aitem_Pragma
(Pragma_Argument_Associations => New_List (
Make_Pragma_Argument_Association (Sloc (Ent),
Expression => Ent),
Make_Pragma_Argument_Association (Sloc (Expr),
Expression => Relocate_Node (Expr))),
Pragma_Name => Name_Attach_Handler);
-- We need to insert this pragma into the tree to get proper
-- processing and to look valid from a placement viewpoint.
Insert_Pragma (Aitem);
goto Continue;
-- Dynamic_Predicate, Predicate, Static_Predicate
when Aspect_Dynamic_Predicate
| Aspect_Predicate
| Aspect_Static_Predicate
=>
-- These aspects apply only to subtypes
if not Is_Type (E) then
Error_Msg_N
("predicate can only be specified for a subtype",
Aspect);
goto Continue;
elsif Is_Incomplete_Type (E) then
Error_Msg_N
("predicate cannot apply to incomplete view", Aspect);
elsif Is_Generic_Type (E) then
Error_Msg_N
("predicate cannot apply to formal type", Aspect);
goto Continue;
end if;
-- Construct the pragma (always a pragma Predicate, with
-- flags recording whether it is static/dynamic). We also
-- set flags recording this in the type itself.
Make_Aitem_Pragma
(Pragma_Argument_Associations => New_List (
Make_Pragma_Argument_Association (Sloc (Ent),
Expression => Ent),
Make_Pragma_Argument_Association (Sloc (Expr),
Expression => Relocate_Node (Expr))),
Pragma_Name => Name_Predicate);
-- Mark type has predicates, and remember what kind of
-- aspect lead to this predicate (we need this to access
-- the right set of check policies later on).
Set_Has_Predicates (E);
if A_Id = Aspect_Dynamic_Predicate then
Set_Has_Dynamic_Predicate_Aspect (E);
-- If the entity has a dynamic predicate, any inherited
-- static predicate becomes dynamic as well, and the
-- predicate function includes the conjunction of both.
Set_Has_Static_Predicate_Aspect (E, False);
elsif A_Id = Aspect_Static_Predicate then
Set_Has_Static_Predicate_Aspect (E);
end if;
-- If the type is private, indicate that its completion
-- has a freeze node, because that is the one that will
-- be visible at freeze time.
if Is_Private_Type (E) and then Present (Full_View (E)) then
Set_Has_Predicates (Full_View (E));
if A_Id = Aspect_Dynamic_Predicate then
Set_Has_Dynamic_Predicate_Aspect (Full_View (E));
elsif A_Id = Aspect_Static_Predicate then
Set_Has_Static_Predicate_Aspect (Full_View (E));
end if;
Set_Has_Delayed_Aspects (Full_View (E));
Ensure_Freeze_Node (Full_View (E));
end if;
-- Predicate_Failure
when Aspect_Predicate_Failure =>
-- This aspect applies only to subtypes
if not Is_Type (E) then
Error_Msg_N
("predicate can only be specified for a subtype",
Aspect);
goto Continue;
elsif Is_Incomplete_Type (E) then
Error_Msg_N
("predicate cannot apply to incomplete view", Aspect);
goto Continue;
end if;
-- Construct the pragma
Make_Aitem_Pragma
(Pragma_Argument_Associations => New_List (
Make_Pragma_Argument_Association (Sloc (Ent),
Expression => Ent),
Make_Pragma_Argument_Association (Sloc (Expr),
Expression => Relocate_Node (Expr))),
Pragma_Name => Name_Predicate_Failure);
Set_Has_Predicates (E);
-- If the type is private, indicate that its completion
-- has a freeze node, because that is the one that will
-- be visible at freeze time.
if Is_Private_Type (E) and then Present (Full_View (E)) then
Set_Has_Predicates (Full_View (E));
Set_Has_Delayed_Aspects (Full_View (E));
Ensure_Freeze_Node (Full_View (E));
end if;
-- Case 2b: Aspects corresponding to pragmas with two
-- arguments, where the second argument is a local name
-- referring to the entity, and the first argument is the
-- aspect definition expression.
-- Convention
when Aspect_Convention =>
Analyze_Aspect_Convention;
goto Continue;
-- External_Name, Link_Name
when Aspect_External_Name
| Aspect_Link_Name
=>
Analyze_Aspect_External_Link_Name;
goto Continue;
-- CPU, Interrupt_Priority, Priority
-- These three aspects can be specified for a subprogram spec
-- or body, in which case we analyze the expression and export
-- the value of the aspect.
-- Previously, we generated an equivalent pragma for bodies
-- (note that the specs cannot contain these pragmas). The
-- pragma was inserted ahead of local declarations, rather than
-- after the body. This leads to a certain duplication between
-- the processing performed for the aspect and the pragma, but
-- given the straightforward handling required it is simpler
-- to duplicate than to translate the aspect in the spec into
-- a pragma in the declarative part of the body.
when Aspect_CPU
| Aspect_Interrupt_Priority
| Aspect_Priority
=>
if Nkind_In (N, N_Subprogram_Body,
N_Subprogram_Declaration)
then
-- Analyze the aspect expression
Analyze_And_Resolve (Expr, Standard_Integer);
-- Interrupt_Priority aspect not allowed for main
-- subprograms. RM D.1 does not forbid this explicitly,
-- but RM J.15.11(6/3) does not permit pragma
-- Interrupt_Priority for subprograms.
if A_Id = Aspect_Interrupt_Priority then
Error_Msg_N
("Interrupt_Priority aspect cannot apply to "
& "subprogram", Expr);
-- The expression must be static
elsif not Is_OK_Static_Expression (Expr) then
Flag_Non_Static_Expr
("aspect requires static expression!", Expr);
-- Check whether this is the main subprogram. Issue a
-- warning only if it is obviously not a main program
-- (when it has parameters or when the subprogram is
-- within a package).
elsif Present (Parameter_Specifications
(Specification (N)))
or else not Is_Compilation_Unit (Defining_Entity (N))
then
-- See RM D.1(14/3) and D.16(12/3)
Error_Msg_N
("aspect applied to subprogram other than the "
& "main subprogram has no effect??", Expr);
-- Otherwise check in range and export the value
-- For the CPU aspect
elsif A_Id = Aspect_CPU then
if Is_In_Range (Expr, RTE (RE_CPU_Range)) then
-- Value is correct so we export the value to make
-- it available at execution time.
Set_Main_CPU
(Main_Unit, UI_To_Int (Expr_Value (Expr)));
else
Error_Msg_N
("main subprogram CPU is out of range", Expr);
end if;
-- For the Priority aspect
elsif A_Id = Aspect_Priority then
if Is_In_Range (Expr, RTE (RE_Priority)) then
-- Value is correct so we export the value to make
-- it available at execution time.
Set_Main_Priority
(Main_Unit, UI_To_Int (Expr_Value (Expr)));
-- Ignore pragma if Relaxed_RM_Semantics to support
-- other targets/non GNAT compilers.
elsif not Relaxed_RM_Semantics then
Error_Msg_N
("main subprogram priority is out of range",
Expr);
end if;
end if;
-- Load an arbitrary entity from System.Tasking.Stages
-- or System.Tasking.Restricted.Stages (depending on
-- the supported profile) to make sure that one of these
-- packages is implicitly with'ed, since we need to have
-- the tasking run time active for the pragma Priority to
-- have any effect. Previously we with'ed the package
-- System.Tasking, but this package does not trigger the
-- required initialization of the run-time library.
declare
Discard : Entity_Id;
begin
if Restricted_Profile then
Discard := RTE (RE_Activate_Restricted_Tasks);
else
Discard := RTE (RE_Activate_Tasks);
end if;
end;
-- Handling for these aspects in subprograms is complete
goto Continue;
-- For task and protected types pass the aspect as an
-- attribute.
else
Aitem :=
Make_Attribute_Definition_Clause (Loc,
Name => Ent,
Chars => Chars (Id),
Expression => Relocate_Node (Expr));
end if;
-- Warnings
when Aspect_Warnings =>
Make_Aitem_Pragma
(Pragma_Argument_Associations => New_List (
Make_Pragma_Argument_Association (Sloc (Expr),
Expression => Relocate_Node (Expr)),
Make_Pragma_Argument_Association (Loc,
Expression => New_Occurrence_Of (E, Loc))),
Pragma_Name => Chars (Id));
Decorate (Aspect, Aitem);
Insert_Pragma (Aitem);
goto Continue;
-- Case 2c: Aspects corresponding to pragmas with three
-- arguments.
-- Invariant aspects have a first argument that references the
-- entity, a second argument that is the expression and a third
-- argument that is an appropriate message.
-- Invariant, Type_Invariant
when Aspect_Invariant
| Aspect_Type_Invariant
=>
-- Analysis of the pragma will verify placement legality:
-- an invariant must apply to a private type, or appear in
-- the private part of a spec and apply to a completion.
Make_Aitem_Pragma
(Pragma_Argument_Associations => New_List (
Make_Pragma_Argument_Association (Sloc (Ent),
Expression => Ent),
Make_Pragma_Argument_Association (Sloc (Expr),
Expression => Relocate_Node (Expr))),
Pragma_Name => Name_Invariant);
-- Add message unless exception messages are suppressed
if not Opt.Exception_Locations_Suppressed then
Append_To (Pragma_Argument_Associations (Aitem),
Make_Pragma_Argument_Association (Eloc,
Chars => Name_Message,
Expression =>
Make_String_Literal (Eloc,
Strval => "failed invariant from "
& Build_Location_String (Eloc))));
end if;
-- For Invariant case, insert immediately after the entity
-- declaration. We do not have to worry about delay issues
-- since the pragma processing takes care of this.
Delay_Required := False;
-- Case 2d : Aspects that correspond to a pragma with one
-- argument.
-- Abstract_State
-- Aspect Abstract_State introduces implicit declarations for
-- all state abstraction entities it defines. To emulate this
-- behavior, insert the pragma at the beginning of the visible
-- declarations of the related package so that it is analyzed
-- immediately.
when Aspect_Abstract_State => Abstract_State : declare
Context : Node_Id := N;
begin
-- When aspect Abstract_State appears on a generic package,
-- it is propageted to the package instance. The context in
-- this case is the instance spec.
if Nkind (Context) = N_Package_Instantiation then
Context := Instance_Spec (Context);
end if;
if Nkind_In (Context, N_Generic_Package_Declaration,
N_Package_Declaration)
then
Make_Aitem_Pragma
(Pragma_Argument_Associations => New_List (
Make_Pragma_Argument_Association (Loc,
Expression => Relocate_Node (Expr))),
Pragma_Name => Name_Abstract_State);
Decorate (Aspect, Aitem);
Insert_Pragma
(Prag => Aitem,
Is_Instance =>
Is_Generic_Instance (Defining_Entity (Context)));
else
Error_Msg_NE
("aspect & must apply to a package declaration",
Aspect, Id);
end if;
goto Continue;
end Abstract_State;
-- Aspect Async_Readers is never delayed because it is
-- equivalent to a source pragma which appears after the
-- related object declaration.
when Aspect_Async_Readers =>
Make_Aitem_Pragma
(Pragma_Argument_Associations => New_List (
Make_Pragma_Argument_Association (Loc,
Expression => Relocate_Node (Expr))),
Pragma_Name => Name_Async_Readers);
Decorate (Aspect, Aitem);
Insert_Pragma (Aitem);
goto Continue;
-- Aspect Async_Writers is never delayed because it is
-- equivalent to a source pragma which appears after the
-- related object declaration.
when Aspect_Async_Writers =>
Make_Aitem_Pragma
(Pragma_Argument_Associations => New_List (
Make_Pragma_Argument_Association (Loc,
Expression => Relocate_Node (Expr))),
Pragma_Name => Name_Async_Writers);
Decorate (Aspect, Aitem);
Insert_Pragma (Aitem);
goto Continue;
-- Aspect Constant_After_Elaboration is never delayed because
-- it is equivalent to a source pragma which appears after the
-- related object declaration.
when Aspect_Constant_After_Elaboration =>
Make_Aitem_Pragma
(Pragma_Argument_Associations => New_List (
Make_Pragma_Argument_Association (Loc,
Expression => Relocate_Node (Expr))),
Pragma_Name =>
Name_Constant_After_Elaboration);
Decorate (Aspect, Aitem);
Insert_Pragma (Aitem);
goto Continue;
-- Aspect Default_Internal_Condition is never delayed because
-- it is equivalent to a source pragma which appears after the
-- related private type. To deal with forward references, the
-- generated pragma is stored in the rep chain of the related
-- private type as types do not carry contracts. The pragma is
-- wrapped inside of a procedure at the freeze point of the
-- private type's full view.
when Aspect_Default_Initial_Condition =>
Make_Aitem_Pragma
(Pragma_Argument_Associations => New_List (
Make_Pragma_Argument_Association (Loc,
Expression => Relocate_Node (Expr))),
Pragma_Name =>
Name_Default_Initial_Condition);
Decorate (Aspect, Aitem);
Insert_Pragma (Aitem);
goto Continue;
-- Default_Storage_Pool
when Aspect_Default_Storage_Pool =>
Make_Aitem_Pragma
(Pragma_Argument_Associations => New_List (
Make_Pragma_Argument_Association (Loc,
Expression => Relocate_Node (Expr))),
Pragma_Name =>
Name_Default_Storage_Pool);
Decorate (Aspect, Aitem);
Insert_Pragma (Aitem);
goto Continue;
-- Depends
-- Aspect Depends is never delayed because it is equivalent to
-- a source pragma which appears after the related subprogram.
-- To deal with forward references, the generated pragma is
-- stored in the contract of the related subprogram and later
-- analyzed at the end of the declarative region. See routine
-- Analyze_Depends_In_Decl_Part for details.
when Aspect_Depends =>
Make_Aitem_Pragma
(Pragma_Argument_Associations => New_List (
Make_Pragma_Argument_Association (Loc,
Expression => Relocate_Node (Expr))),
Pragma_Name => Name_Depends);
Decorate (Aspect, Aitem);
Insert_Pragma (Aitem);
goto Continue;
-- Aspect Effecitve_Reads is never delayed because it is
-- equivalent to a source pragma which appears after the
-- related object declaration.
when Aspect_Effective_Reads =>
Make_Aitem_Pragma
(Pragma_Argument_Associations => New_List (
Make_Pragma_Argument_Association (Loc,
Expression => Relocate_Node (Expr))),
Pragma_Name => Name_Effective_Reads);
Decorate (Aspect, Aitem);
Insert_Pragma (Aitem);
goto Continue;
-- Aspect Effective_Writes is never delayed because it is
-- equivalent to a source pragma which appears after the
-- related object declaration.
when Aspect_Effective_Writes =>
Make_Aitem_Pragma
(Pragma_Argument_Associations => New_List (
Make_Pragma_Argument_Association (Loc,
Expression => Relocate_Node (Expr))),
Pragma_Name => Name_Effective_Writes);
Decorate (Aspect, Aitem);
Insert_Pragma (Aitem);
goto Continue;
-- Aspect Extensions_Visible is never delayed because it is
-- equivalent to a source pragma which appears after the
-- related subprogram.
when Aspect_Extensions_Visible =>
Make_Aitem_Pragma
(Pragma_Argument_Associations => New_List (
Make_Pragma_Argument_Association (Loc,
Expression => Relocate_Node (Expr))),
Pragma_Name => Name_Extensions_Visible);
Decorate (Aspect, Aitem);
Insert_Pragma (Aitem);
goto Continue;
-- Aspect Ghost is never delayed because it is equivalent to a
-- source pragma which appears at the top of [generic] package
-- declarations or after an object, a [generic] subprogram, or
-- a type declaration.
when Aspect_Ghost =>
Make_Aitem_Pragma
(Pragma_Argument_Associations => New_List (
Make_Pragma_Argument_Association (Loc,
Expression => Relocate_Node (Expr))),
Pragma_Name => Name_Ghost);
Decorate (Aspect, Aitem);
Insert_Pragma (Aitem);
goto Continue;
-- Global
-- Aspect Global is never delayed because it is equivalent to
-- a source pragma which appears after the related subprogram.
-- To deal with forward references, the generated pragma is
-- stored in the contract of the related subprogram and later
-- analyzed at the end of the declarative region. See routine
-- Analyze_Global_In_Decl_Part for details.
when Aspect_Global =>
Make_Aitem_Pragma
(Pragma_Argument_Associations => New_List (
Make_Pragma_Argument_Association (Loc,
Expression => Relocate_Node (Expr))),
Pragma_Name => Name_Global);
Decorate (Aspect, Aitem);
Insert_Pragma (Aitem);
goto Continue;
-- Initial_Condition
-- Aspect Initial_Condition is never delayed because it is
-- equivalent to a source pragma which appears after the
-- related package. To deal with forward references, the
-- generated pragma is stored in the contract of the related
-- package and later analyzed at the end of the declarative
-- region. See routine Analyze_Initial_Condition_In_Decl_Part
-- for details.
when Aspect_Initial_Condition => Initial_Condition : declare
Context : Node_Id := N;
begin
-- When aspect Initial_Condition appears on a generic
-- package, it is propageted to the package instance. The
-- context in this case is the instance spec.
if Nkind (Context) = N_Package_Instantiation then
Context := Instance_Spec (Context);
end if;
if Nkind_In (Context, N_Generic_Package_Declaration,
N_Package_Declaration)
then
Make_Aitem_Pragma
(Pragma_Argument_Associations => New_List (
Make_Pragma_Argument_Association (Loc,
Expression => Relocate_Node (Expr))),
Pragma_Name =>
Name_Initial_Condition);
Decorate (Aspect, Aitem);
Insert_Pragma
(Prag => Aitem,
Is_Instance =>
Is_Generic_Instance (Defining_Entity (Context)));
-- Otherwise the context is illegal
else
Error_Msg_NE
("aspect & must apply to a package declaration",
Aspect, Id);
end if;
goto Continue;
end Initial_Condition;
-- Initializes
-- Aspect Initializes is never delayed because it is equivalent
-- to a source pragma appearing after the related package. To
-- deal with forward references, the generated pragma is stored
-- in the contract of the related package and later analyzed at
-- the end of the declarative region. For details, see routine
-- Analyze_Initializes_In_Decl_Part.
when Aspect_Initializes => Initializes : declare
Context : Node_Id := N;
begin
-- When aspect Initializes appears on a generic package,
-- it is propageted to the package instance. The context
-- in this case is the instance spec.
if Nkind (Context) = N_Package_Instantiation then
Context := Instance_Spec (Context);
end if;
if Nkind_In (Context, N_Generic_Package_Declaration,
N_Package_Declaration)
then
Make_Aitem_Pragma
(Pragma_Argument_Associations => New_List (
Make_Pragma_Argument_Association (Loc,
Expression => Relocate_Node (Expr))),
Pragma_Name => Name_Initializes);
Decorate (Aspect, Aitem);
Insert_Pragma
(Prag => Aitem,
Is_Instance =>
Is_Generic_Instance (Defining_Entity (Context)));
-- Otherwise the context is illegal
else
Error_Msg_NE
("aspect & must apply to a package declaration",
Aspect, Id);
end if;
goto Continue;
end Initializes;
-- Max_Queue_Length
when Aspect_Max_Queue_Length =>
Make_Aitem_Pragma
(Pragma_Argument_Associations => New_List (
Make_Pragma_Argument_Association (Loc,
Expression => Relocate_Node (Expr))),
Pragma_Name => Name_Max_Queue_Length);
Decorate (Aspect, Aitem);
Insert_Pragma (Aitem);
goto Continue;
-- Obsolescent
when Aspect_Obsolescent => declare
Args : List_Id;
begin
if No (Expr) then
Args := No_List;
else
Args := New_List (
Make_Pragma_Argument_Association (Sloc (Expr),
Expression => Relocate_Node (Expr)));
end if;
Make_Aitem_Pragma
(Pragma_Argument_Associations => Args,
Pragma_Name => Chars (Id));
end;
-- Part_Of
when Aspect_Part_Of =>
if Nkind_In (N, N_Object_Declaration,
N_Package_Instantiation)
or else Is_Single_Concurrent_Type_Declaration (N)
then
Make_Aitem_Pragma
(Pragma_Argument_Associations => New_List (
Make_Pragma_Argument_Association (Loc,
Expression => Relocate_Node (Expr))),
Pragma_Name => Name_Part_Of);
Decorate (Aspect, Aitem);
Insert_Pragma (Aitem);
else
Error_Msg_NE
("aspect & must apply to package instantiation, "
& "object, single protected type or single task type",
Aspect, Id);
end if;
goto Continue;
-- SPARK_Mode
when Aspect_SPARK_Mode =>
Make_Aitem_Pragma
(Pragma_Argument_Associations => New_List (
Make_Pragma_Argument_Association (Loc,
Expression => Relocate_Node (Expr))),
Pragma_Name => Name_SPARK_Mode);
Decorate (Aspect, Aitem);
Insert_Pragma (Aitem);
goto Continue;
-- Refined_Depends
-- Aspect Refined_Depends is never delayed because it is
-- equivalent to a source pragma which appears in the
-- declarations of the related subprogram body. To deal with
-- forward references, the generated pragma is stored in the
-- contract of the related subprogram body and later analyzed
-- at the end of the declarative region. For details, see
-- routine Analyze_Refined_Depends_In_Decl_Part.
when Aspect_Refined_Depends =>
Make_Aitem_Pragma
(Pragma_Argument_Associations => New_List (
Make_Pragma_Argument_Association (Loc,
Expression => Relocate_Node (Expr))),
Pragma_Name => Name_Refined_Depends);
Decorate (Aspect, Aitem);
Insert_Pragma (Aitem);
goto Continue;
-- Refined_Global
-- Aspect Refined_Global is never delayed because it is
-- equivalent to a source pragma which appears in the
-- declarations of the related subprogram body. To deal with
-- forward references, the generated pragma is stored in the
-- contract of the related subprogram body and later analyzed
-- at the end of the declarative region. For details, see
-- routine Analyze_Refined_Global_In_Decl_Part.
when Aspect_Refined_Global =>
Make_Aitem_Pragma
(Pragma_Argument_Associations => New_List (
Make_Pragma_Argument_Association (Loc,
Expression => Relocate_Node (Expr))),
Pragma_Name => Name_Refined_Global);
Decorate (Aspect, Aitem);
Insert_Pragma (Aitem);
goto Continue;
-- Refined_Post
when Aspect_Refined_Post =>
Make_Aitem_Pragma
(Pragma_Argument_Associations => New_List (
Make_Pragma_Argument_Association (Loc,
Expression => Relocate_Node (Expr))),
Pragma_Name => Name_Refined_Post);
Decorate (Aspect, Aitem);
Insert_Pragma (Aitem);
goto Continue;
-- Refined_State
when Aspect_Refined_State =>
-- The corresponding pragma for Refined_State is inserted in
-- the declarations of the related package body. This action
-- synchronizes both the source and from-aspect versions of
-- the pragma.
if Nkind (N) = N_Package_Body then
Make_Aitem_Pragma
(Pragma_Argument_Associations => New_List (
Make_Pragma_Argument_Association (Loc,
Expression => Relocate_Node (Expr))),
Pragma_Name => Name_Refined_State);
Decorate (Aspect, Aitem);
Insert_Pragma (Aitem);
-- Otherwise the context is illegal
else
Error_Msg_NE
("aspect & must apply to a package body", Aspect, Id);
end if;
goto Continue;
-- Relative_Deadline
when Aspect_Relative_Deadline =>
Make_Aitem_Pragma
(Pragma_Argument_Associations => New_List (
Make_Pragma_Argument_Association (Loc,
Expression => Relocate_Node (Expr))),
Pragma_Name => Name_Relative_Deadline);
-- If the aspect applies to a task, the corresponding pragma
-- must appear within its declarations, not after.
if Nkind (N) = N_Task_Type_Declaration then
declare
Def : Node_Id;
V : List_Id;
begin
if No (Task_Definition (N)) then
Set_Task_Definition (N,
Make_Task_Definition (Loc,
Visible_Declarations => New_List,
End_Label => Empty));
end if;
Def := Task_Definition (N);
V := Visible_Declarations (Def);
if not Is_Empty_List (V) then
Insert_Before (First (V), Aitem);
else
Set_Visible_Declarations (Def, New_List (Aitem));
end if;
goto Continue;
end;
end if;
-- Secondary_Stack_Size
-- Aspect Secondary_Stack_Size needs to be converted into a
-- pragma for two reasons: the attribute is not analyzed until
-- after the expansion of the task type declaration and the
-- attribute does not have visibility on the discriminant.
when Aspect_Secondary_Stack_Size =>
Make_Aitem_Pragma
(Pragma_Argument_Associations => New_List (
Make_Pragma_Argument_Association (Loc,
Expression => Relocate_Node (Expr))),
Pragma_Name =>
Name_Secondary_Stack_Size);
Decorate (Aspect, Aitem);
Insert_Pragma (Aitem);
goto Continue;
-- Volatile_Function
-- Aspect Volatile_Function is never delayed because it is
-- equivalent to a source pragma which appears after the
-- related subprogram.
when Aspect_Volatile_Function =>
Make_Aitem_Pragma
(Pragma_Argument_Associations => New_List (
Make_Pragma_Argument_Association (Loc,
Expression => Relocate_Node (Expr))),
Pragma_Name => Name_Volatile_Function);
Decorate (Aspect, Aitem);
Insert_Pragma (Aitem);
goto Continue;
-- Case 2e: Annotate aspect
when Aspect_Annotate =>
declare
Args : List_Id;
Pargs : List_Id;
Arg : Node_Id;
begin
-- The argument can be a single identifier
if Nkind (Expr) = N_Identifier then
-- One level of parens is allowed
if Paren_Count (Expr) > 1 then
Error_Msg_F ("extra parentheses ignored", Expr);
end if;
Set_Paren_Count (Expr, 0);
-- Add the single item to the list
Args := New_List (Expr);
-- Otherwise we must have an aggregate
elsif Nkind (Expr) = N_Aggregate then
-- Must be positional
if Present (Component_Associations (Expr)) then
Error_Msg_F
("purely positional aggregate required", Expr);
goto Continue;
end if;
-- Must not be parenthesized
if Paren_Count (Expr) /= 0 then
Error_Msg_F ("extra parentheses ignored", Expr);
end if;
-- List of arguments is list of aggregate expressions
Args := Expressions (Expr);
-- Anything else is illegal
else
Error_Msg_F ("wrong form for Annotate aspect", Expr);
goto Continue;
end if;
-- Prepare pragma arguments
Pargs := New_List;
Arg := First (Args);
while Present (Arg) loop
Append_To (Pargs,
Make_Pragma_Argument_Association (Sloc (Arg),
Expression => Relocate_Node (Arg)));
Next (Arg);
end loop;
Append_To (Pargs,
Make_Pragma_Argument_Association (Sloc (Ent),
Chars => Name_Entity,
Expression => Ent));
Make_Aitem_Pragma
(Pragma_Argument_Associations => Pargs,
Pragma_Name => Name_Annotate);
end;
-- Case 3 : Aspects that don't correspond to pragma/attribute
-- definition clause.
-- Case 3a: The aspects listed below don't correspond to
-- pragmas/attributes but do require delayed analysis.
-- Default_Value can only apply to a scalar type
when Aspect_Default_Value =>
if not Is_Scalar_Type (E) then
Error_Msg_N
("aspect Default_Value must apply to a scalar type", N);
end if;
Aitem := Empty;
-- Default_Component_Value can only apply to an array type
-- with scalar components.
when Aspect_Default_Component_Value =>
if not (Is_Array_Type (E)
and then Is_Scalar_Type (Component_Type (E)))
then
Error_Msg_N
("aspect Default_Component_Value can only apply to an "
& "array of scalar components", N);
end if;
Aitem := Empty;
-- Case 3b: The aspects listed below don't correspond to
-- pragmas/attributes and don't need delayed analysis.
-- Implicit_Dereference
-- For Implicit_Dereference, External_Name and Link_Name, only
-- the legality checks are done during the analysis, thus no
-- delay is required.
when Aspect_Implicit_Dereference =>
Analyze_Aspect_Implicit_Dereference;
goto Continue;
-- Dimension
when Aspect_Dimension =>
Analyze_Aspect_Dimension (N, Id, Expr);
goto Continue;
-- Dimension_System
when Aspect_Dimension_System =>
Analyze_Aspect_Dimension_System (N, Id, Expr);
goto Continue;
-- Case 4: Aspects requiring special handling
-- Pre/Post/Test_Case/Contract_Cases whose corresponding
-- pragmas take care of the delay.
-- Pre/Post
-- Aspects Pre/Post generate Precondition/Postcondition pragmas
-- with a first argument that is the expression, and a second
-- argument that is an informative message if the test fails.
-- This is inserted right after the declaration, to get the
-- required pragma placement. The processing for the pragmas
-- takes care of the required delay.
when Pre_Post_Aspects => Pre_Post : declare
Pname : Name_Id;
begin
if A_Id = Aspect_Pre or else A_Id = Aspect_Precondition then
Pname := Name_Precondition;
else
Pname := Name_Postcondition;
end if;
-- Check that the class-wide predicate cannot be applied to
-- an operation of a synchronized type. AI12-0182 forbids
-- these altogether, while earlier language semantics made
-- them legal on tagged synchronized types.
-- Other legality checks are performed when analyzing the
-- contract of the operation.
if Class_Present (Aspect)
and then Is_Concurrent_Type (Current_Scope)
and then Ekind_In (E, E_Entry, E_Function, E_Procedure)
then
Error_Msg_Name_1 := Original_Aspect_Pragma_Name (Aspect);
Error_Msg_N
("aspect % can only be specified for a primitive "
& "operation of a tagged type", Aspect);
goto Continue;
end if;
-- If the expressions is of the form A and then B, then
-- we generate separate Pre/Post aspects for the separate
-- clauses. Since we allow multiple pragmas, there is no
-- problem in allowing multiple Pre/Post aspects internally.
-- These should be treated in reverse order (B first and
-- A second) since they are later inserted just after N in
-- the order they are treated. This way, the pragma for A
-- ends up preceding the pragma for B, which may have an
-- importance for the error raised (either constraint error
-- or precondition error).
-- We do not do this for Pre'Class, since we have to put
-- these conditions together in a complex OR expression.
-- We do not do this in ASIS mode, as ASIS relies on the
-- original node representing the complete expression, when
-- retrieving it through the source aspect table.
if not ASIS_Mode
and then (Pname = Name_Postcondition
or else not Class_Present (Aspect))
then
while Nkind (Expr) = N_And_Then loop
Insert_After (Aspect,
Make_Aspect_Specification (Sloc (Left_Opnd (Expr)),
Identifier => Identifier (Aspect),
Expression => Relocate_Node (Left_Opnd (Expr)),
Class_Present => Class_Present (Aspect),
Split_PPC => True));
Rewrite (Expr, Relocate_Node (Right_Opnd (Expr)));
Eloc := Sloc (Expr);
end loop;
end if;
-- Build the precondition/postcondition pragma
-- Add note about why we do NOT need Copy_Tree here???
Make_Aitem_Pragma
(Pragma_Argument_Associations => New_List (
Make_Pragma_Argument_Association (Eloc,
Chars => Name_Check,
Expression => Relocate_Node (Expr))),
Pragma_Name => Pname);
-- Add message unless exception messages are suppressed
if not Opt.Exception_Locations_Suppressed then
Append_To (Pragma_Argument_Associations (Aitem),
Make_Pragma_Argument_Association (Eloc,
Chars => Name_Message,
Expression =>
Make_String_Literal (Eloc,
Strval => "failed "
& Get_Name_String (Pname)
& " from "
& Build_Location_String (Eloc))));
end if;
Set_Is_Delayed_Aspect (Aspect);
-- For Pre/Post cases, insert immediately after the entity
-- declaration, since that is the required pragma placement.
-- Note that for these aspects, we do not have to worry
-- about delay issues, since the pragmas themselves deal
-- with delay of visibility for the expression analysis.
Insert_Pragma (Aitem);
goto Continue;
end Pre_Post;
-- Test_Case
when Aspect_Test_Case => Test_Case : declare
Args : List_Id;
Comp_Expr : Node_Id;
Comp_Assn : Node_Id;
New_Expr : Node_Id;
begin
Args := New_List;
if Nkind (Parent (N)) = N_Compilation_Unit then
Error_Msg_Name_1 := Nam;
Error_Msg_N ("incorrect placement of aspect `%`", E);
goto Continue;
end if;
if Nkind (Expr) /= N_Aggregate then
Error_Msg_Name_1 := Nam;
Error_Msg_NE
("wrong syntax for aspect `%` for &", Id, E);
goto Continue;
end if;
-- Make pragma expressions refer to the original aspect
-- expressions through the Original_Node link. This is used
-- in semantic analysis for ASIS mode, so that the original
-- expression also gets analyzed.
Comp_Expr := First (Expressions (Expr));
while Present (Comp_Expr) loop
New_Expr := Relocate_Node (Comp_Expr);
Append_To (Args,
Make_Pragma_Argument_Association (Sloc (Comp_Expr),
Expression => New_Expr));
Next (Comp_Expr);
end loop;
Comp_Assn := First (Component_Associations (Expr));
while Present (Comp_Assn) loop
if List_Length (Choices (Comp_Assn)) /= 1
or else
Nkind (First (Choices (Comp_Assn))) /= N_Identifier
then
Error_Msg_Name_1 := Nam;
Error_Msg_NE
("wrong syntax for aspect `%` for &", Id, E);
goto Continue;
end if;
Append_To (Args,
Make_Pragma_Argument_Association (Sloc (Comp_Assn),
Chars => Chars (First (Choices (Comp_Assn))),
Expression =>
Relocate_Node (Expression (Comp_Assn))));
Next (Comp_Assn);
end loop;
-- Build the test-case pragma
Make_Aitem_Pragma
(Pragma_Argument_Associations => Args,
Pragma_Name => Nam);
end Test_Case;
-- Contract_Cases
when Aspect_Contract_Cases =>
Make_Aitem_Pragma
(Pragma_Argument_Associations => New_List (
Make_Pragma_Argument_Association (Loc,
Expression => Relocate_Node (Expr))),
Pragma_Name => Nam);
Decorate (Aspect, Aitem);
Insert_Pragma (Aitem);
goto Continue;
-- Case 5: Special handling for aspects with an optional
-- boolean argument.
-- In the delayed case, the corresponding pragma cannot be
-- generated yet because the evaluation of the boolean needs
-- to be delayed till the freeze point.
when Boolean_Aspects
| Library_Unit_Aspects
=>
Set_Is_Boolean_Aspect (Aspect);
-- Lock_Free aspect only apply to protected objects
if A_Id = Aspect_Lock_Free then
if Ekind (E) /= E_Protected_Type then
Error_Msg_Name_1 := Nam;
Error_Msg_N
("aspect % only applies to a protected object",
Aspect);
else
-- Set the Uses_Lock_Free flag to True if there is no
-- expression or if the expression is True. The
-- evaluation of this aspect should be delayed to the
-- freeze point (why???)
if No (Expr)
or else Is_True (Static_Boolean (Expr))
then
Set_Uses_Lock_Free (E);
end if;
Record_Rep_Item (E, Aspect);
end if;
goto Continue;
elsif A_Id = Aspect_Export or else A_Id = Aspect_Import then
Analyze_Aspect_Export_Import;
-- Disable_Controlled
elsif A_Id = Aspect_Disable_Controlled then
Analyze_Aspect_Disable_Controlled;
goto Continue;
end if;
-- Library unit aspects require special handling in the case
-- of a package declaration, the pragma needs to be inserted
-- in the list of declarations for the associated package.
-- There is no issue of visibility delay for these aspects.
if A_Id in Library_Unit_Aspects
and then
Nkind_In (N, N_Package_Declaration,
N_Generic_Package_Declaration)
and then Nkind (Parent (N)) /= N_Compilation_Unit
-- Aspect is legal on a local instantiation of a library-
-- level generic unit.
and then not Is_Generic_Instance (Defining_Entity (N))
then
Error_Msg_N
("incorrect context for library unit aspect&", Id);
goto Continue;
end if;
-- Cases where we do not delay, includes all cases where the
-- expression is missing other than the above cases.
if not Delay_Required or else No (Expr) then
-- Exclude aspects Export and Import because their pragma
-- syntax does not map directly to a Boolean aspect.
if A_Id /= Aspect_Export
and then A_Id /= Aspect_Import
then
Make_Aitem_Pragma
(Pragma_Argument_Associations => New_List (
Make_Pragma_Argument_Association (Sloc (Ent),
Expression => Ent)),
Pragma_Name => Chars (Id));
end if;
Delay_Required := False;
-- In general cases, the corresponding pragma/attribute
-- definition clause will be inserted later at the freezing
-- point, and we do not need to build it now.
else
Aitem := Empty;
end if;
-- Storage_Size
-- This is special because for access types we need to generate
-- an attribute definition clause. This also works for single
-- task declarations, but it does not work for task type
-- declarations, because we have the case where the expression
-- references a discriminant of the task type. That can't use
-- an attribute definition clause because we would not have
-- visibility on the discriminant. For that case we must
-- generate a pragma in the task definition.
when Aspect_Storage_Size =>
-- Task type case
if Ekind (E) = E_Task_Type then
declare
Decl : constant Node_Id := Declaration_Node (E);
begin
pragma Assert (Nkind (Decl) = N_Task_Type_Declaration);
-- If no task definition, create one
if No (Task_Definition (Decl)) then
Set_Task_Definition (Decl,
Make_Task_Definition (Loc,
Visible_Declarations => Empty_List,
End_Label => Empty));
end if;
-- Create a pragma and put it at the start of the task
-- definition for the task type declaration.
Make_Aitem_Pragma
(Pragma_Argument_Associations => New_List (
Make_Pragma_Argument_Association (Loc,
Expression => Relocate_Node (Expr))),
Pragma_Name => Name_Storage_Size);
Prepend
(Aitem,
Visible_Declarations (Task_Definition (Decl)));
goto Continue;
end;
-- All other cases, generate attribute definition
else
Aitem :=
Make_Attribute_Definition_Clause (Loc,
Name => Ent,
Chars => Chars (Id),
Expression => Relocate_Node (Expr));
end if;
end case;
-- Attach the corresponding pragma/attribute definition clause to
-- the aspect specification node.
if Present (Aitem) then
Set_From_Aspect_Specification (Aitem);
end if;
-- In the context of a compilation unit, we directly put the
-- pragma in the Pragmas_After list of the N_Compilation_Unit_Aux
-- node (no delay is required here) except for aspects on a
-- subprogram body (see below) and a generic package, for which we
-- need to introduce the pragma before building the generic copy
-- (see sem_ch12), and for package instantiations, where the
-- library unit pragmas are better handled early.
if Nkind (Parent (N)) = N_Compilation_Unit
and then (Present (Aitem) or else Is_Boolean_Aspect (Aspect))
then
declare
Aux : constant Node_Id := Aux_Decls_Node (Parent (N));
begin
pragma Assert (Nkind (Aux) = N_Compilation_Unit_Aux);
-- For a Boolean aspect, create the corresponding pragma if
-- no expression or if the value is True.
if Is_Boolean_Aspect (Aspect) and then No (Aitem) then
if Is_True (Static_Boolean (Expr)) then
Make_Aitem_Pragma
(Pragma_Argument_Associations => New_List (
Make_Pragma_Argument_Association (Sloc (Ent),
Expression => Ent)),
Pragma_Name => Chars (Id));
Set_From_Aspect_Specification (Aitem, True);
Set_Corresponding_Aspect (Aitem, Aspect);
else
goto Continue;
end if;
end if;
-- If the aspect is on a subprogram body (relevant aspect
-- is Inline), add the pragma in front of the declarations.
if Nkind (N) = N_Subprogram_Body then
if No (Declarations (N)) then
Set_Declarations (N, New_List);
end if;
Prepend (Aitem, Declarations (N));
elsif Nkind (N) = N_Generic_Package_Declaration then
if No (Visible_Declarations (Specification (N))) then
Set_Visible_Declarations (Specification (N), New_List);
end if;
Prepend (Aitem,
Visible_Declarations (Specification (N)));
elsif Nkind (N) = N_Package_Instantiation then
declare
Spec : constant Node_Id :=
Specification (Instance_Spec (N));
begin
if No (Visible_Declarations (Spec)) then
Set_Visible_Declarations (Spec, New_List);
end if;
Prepend (Aitem, Visible_Declarations (Spec));
end;
else
if No (Pragmas_After (Aux)) then
Set_Pragmas_After (Aux, New_List);
end if;
Append (Aitem, Pragmas_After (Aux));
end if;
goto Continue;
end;
end if;
-- The evaluation of the aspect is delayed to the freezing point.
-- The pragma or attribute clause if there is one is then attached
-- to the aspect specification which is put in the rep item list.
if Delay_Required then
if Present (Aitem) then
Set_Is_Delayed_Aspect (Aitem);
Set_Aspect_Rep_Item (Aspect, Aitem);
Set_Parent (Aitem, Aspect);
end if;
Set_Is_Delayed_Aspect (Aspect);
-- In the case of Default_Value, link the aspect to base type
-- as well, even though it appears on a first subtype. This is
-- mandated by the semantics of the aspect. Do not establish
-- the link when processing the base type itself as this leads
-- to a rep item circularity. Verify that we are dealing with
-- a scalar type to prevent cascaded errors.
if A_Id = Aspect_Default_Value
and then Is_Scalar_Type (E)
and then Base_Type (E) /= E
then
Set_Has_Delayed_Aspects (Base_Type (E));
Record_Rep_Item (Base_Type (E), Aspect);
end if;
Set_Has_Delayed_Aspects (E);
Record_Rep_Item (E, Aspect);
-- When delay is not required and the context is a package or a
-- subprogram body, insert the pragma in the body declarations.
elsif Nkind_In (N, N_Package_Body, N_Subprogram_Body) then
if No (Declarations (N)) then
Set_Declarations (N, New_List);
end if;
-- The pragma is added before source declarations
Prepend_To (Declarations (N), Aitem);
-- When delay is not required and the context is not a compilation
-- unit, we simply insert the pragma/attribute definition clause
-- in sequence.
elsif Present (Aitem) then
Insert_After (Ins_Node, Aitem);
Ins_Node := Aitem;
end if;
end Analyze_One_Aspect;
<<Continue>>
Next (Aspect);
end loop Aspect_Loop;
if Has_Delayed_Aspects (E) then
Ensure_Freeze_Node (E);
end if;
end Analyze_Aspect_Specifications;
---------------------------------------------------
-- Analyze_Aspect_Specifications_On_Body_Or_Stub --
---------------------------------------------------
procedure Analyze_Aspect_Specifications_On_Body_Or_Stub (N : Node_Id) is
Body_Id : constant Entity_Id := Defining_Entity (N);
procedure Diagnose_Misplaced_Aspects (Spec_Id : Entity_Id);
-- Body [stub] N has aspects, but they are not properly placed. Emit an
-- error message depending on the aspects involved. Spec_Id denotes the
-- entity of the corresponding spec.
--------------------------------
-- Diagnose_Misplaced_Aspects --
--------------------------------
procedure Diagnose_Misplaced_Aspects (Spec_Id : Entity_Id) is
procedure Misplaced_Aspect_Error
(Asp : Node_Id;
Ref_Nam : Name_Id);
-- Emit an error message concerning misplaced aspect Asp. Ref_Nam is
-- the name of the refined version of the aspect.
----------------------------
-- Misplaced_Aspect_Error --
----------------------------
procedure Misplaced_Aspect_Error
(Asp : Node_Id;
Ref_Nam : Name_Id)
is
Asp_Nam : constant Name_Id := Chars (Identifier (Asp));
Asp_Id : constant Aspect_Id := Get_Aspect_Id (Asp_Nam);
begin
-- The corresponding spec already contains the aspect in question
-- and the one appearing on the body must be the refined form:
-- procedure P with Global ...;
-- procedure P with Global ... is ... end P;
-- ^
-- Refined_Global
if Has_Aspect (Spec_Id, Asp_Id) then
Error_Msg_Name_1 := Asp_Nam;
-- Subunits cannot carry aspects that apply to a subprogram
-- declaration.
if Nkind (Parent (N)) = N_Subunit then
Error_Msg_N ("aspect % cannot apply to a subunit", Asp);
-- Otherwise suggest the refined form
else
Error_Msg_Name_2 := Ref_Nam;
Error_Msg_N ("aspect % should be %", Asp);
end if;
-- Otherwise the aspect must appear on the spec, not on the body
-- procedure P;
-- procedure P with Global ... is ... end P;
else
Error_Msg_N
("aspect specification must appear on initial declaration",
Asp);
end if;
end Misplaced_Aspect_Error;
-- Local variables
Asp : Node_Id;
Asp_Nam : Name_Id;
-- Start of processing for Diagnose_Misplaced_Aspects
begin
-- Iterate over the aspect specifications and emit specific errors
-- where applicable.
Asp := First (Aspect_Specifications (N));
while Present (Asp) loop
Asp_Nam := Chars (Identifier (Asp));
-- Do not emit errors on aspects that can appear on a subprogram
-- body. This scenario occurs when the aspect specification list
-- contains both misplaced and properly placed aspects.
if Aspect_On_Body_Or_Stub_OK (Get_Aspect_Id (Asp_Nam)) then
null;
-- Special diagnostics for SPARK aspects
elsif Asp_Nam = Name_Depends then
Misplaced_Aspect_Error (Asp, Name_Refined_Depends);
elsif Asp_Nam = Name_Global then
Misplaced_Aspect_Error (Asp, Name_Refined_Global);
elsif Asp_Nam = Name_Post then
Misplaced_Aspect_Error (Asp, Name_Refined_Post);
-- Otherwise a language-defined aspect is misplaced
else
Error_Msg_N
("aspect specification must appear on initial declaration",
Asp);
end if;
Next (Asp);
end loop;
end Diagnose_Misplaced_Aspects;
-- Local variables
Spec_Id : constant Entity_Id := Unique_Defining_Entity (N);
-- Start of processing for Analyze_Aspects_On_Body_Or_Stub
begin
-- Language-defined aspects cannot be associated with a subprogram body
-- [stub] if the subprogram has a spec. Certain implementation defined
-- aspects are allowed to break this rule (for all applicable cases, see
-- table Aspects.Aspect_On_Body_Or_Stub_OK).
if Spec_Id /= Body_Id and then not Aspects_On_Body_Or_Stub_OK (N) then
Diagnose_Misplaced_Aspects (Spec_Id);
else
Analyze_Aspect_Specifications (N, Body_Id);
end if;
end Analyze_Aspect_Specifications_On_Body_Or_Stub;
-----------------------
-- Analyze_At_Clause --
-----------------------
-- An at clause is replaced by the corresponding Address attribute
-- definition clause that is the preferred approach in Ada 95.
procedure Analyze_At_Clause (N : Node_Id) is
CS : constant Boolean := Comes_From_Source (N);
begin
-- This is an obsolescent feature
Check_Restriction (No_Obsolescent_Features, N);
if Warn_On_Obsolescent_Feature then
Error_Msg_N
("?j?at clause is an obsolescent feature (RM J.7(2))", N);
Error_Msg_N
("\?j?use address attribute definition clause instead", N);
end if;
-- Rewrite as address clause
Rewrite (N,
Make_Attribute_Definition_Clause (Sloc (N),
Name => Identifier (N),
Chars => Name_Address,
Expression => Expression (N)));
-- We preserve Comes_From_Source, since logically the clause still comes
-- from the source program even though it is changed in form.
Set_Comes_From_Source (N, CS);
-- Analyze rewritten clause
Analyze_Attribute_Definition_Clause (N);
end Analyze_At_Clause;
-----------------------------------------
-- Analyze_Attribute_Definition_Clause --
-----------------------------------------
procedure Analyze_Attribute_Definition_Clause (N : Node_Id) is
Loc : constant Source_Ptr := Sloc (N);
Nam : constant Node_Id := Name (N);
Attr : constant Name_Id := Chars (N);
Expr : constant Node_Id := Expression (N);
Id : constant Attribute_Id := Get_Attribute_Id (Attr);
Ent : Entity_Id;
-- The entity of Nam after it is analyzed. In the case of an incomplete
-- type, this is the underlying type.
U_Ent : Entity_Id;
-- The underlying entity to which the attribute applies. Generally this
-- is the Underlying_Type of Ent, except in the case where the clause
-- applies to the full view of an incomplete or private type, in which
-- case U_Ent is just a copy of Ent.
FOnly : Boolean := False;
-- Reset to True for subtype specific attribute (Alignment, Size)
-- and for stream attributes, i.e. those cases where in the call to
-- Rep_Item_Too_Late, FOnly is set True so that only the freezing rules
-- are checked. Note that the case of stream attributes is not clear
-- from the RM, but see AI95-00137. Also, the RM seems to disallow
-- Storage_Size for derived task types, but that is also clearly
-- unintentional.
procedure Analyze_Stream_TSS_Definition (TSS_Nam : TSS_Name_Type);
-- Common processing for 'Read, 'Write, 'Input and 'Output attribute
-- definition clauses.
function Duplicate_Clause return Boolean;
-- This routine checks if the aspect for U_Ent being given by attribute
-- definition clause N is for an aspect that has already been specified,
-- and if so gives an error message. If there is a duplicate, True is
-- returned, otherwise if there is no error, False is returned.
procedure Check_Indexing_Functions;
-- Check that the function in Constant_Indexing or Variable_Indexing
-- attribute has the proper type structure. If the name is overloaded,
-- check that some interpretation is legal.
procedure Check_Iterator_Functions;
-- Check that there is a single function in Default_Iterator attribute
-- that has the proper type structure.
function Check_Primitive_Function (Subp : Entity_Id) return Boolean;
-- Common legality check for the previous two
-----------------------------------
-- Analyze_Stream_TSS_Definition --
-----------------------------------
procedure Analyze_Stream_TSS_Definition (TSS_Nam : TSS_Name_Type) is
Subp : Entity_Id := Empty;
I : Interp_Index;
It : Interp;
Pnam : Entity_Id;
Is_Read : constant Boolean := (TSS_Nam = TSS_Stream_Read);
-- True for Read attribute, False for other attributes
function Has_Good_Profile
(Subp : Entity_Id;
Report : Boolean := False) return Boolean;
-- Return true if the entity is a subprogram with an appropriate
-- profile for the attribute being defined. If result is False and
-- Report is True, function emits appropriate error.
----------------------
-- Has_Good_Profile --
----------------------
function Has_Good_Profile
(Subp : Entity_Id;
Report : Boolean := False) return Boolean
is
Expected_Ekind : constant array (Boolean) of Entity_Kind :=
(False => E_Procedure, True => E_Function);
Is_Function : constant Boolean := (TSS_Nam = TSS_Stream_Input);
F : Entity_Id;
Typ : Entity_Id;
begin
if Ekind (Subp) /= Expected_Ekind (Is_Function) then
return False;
end if;
F := First_Formal (Subp);
if No (F)
or else Ekind (Etype (F)) /= E_Anonymous_Access_Type
or else Designated_Type (Etype (F)) /=
Class_Wide_Type (RTE (RE_Root_Stream_Type))
then
return False;
end if;
if not Is_Function then
Next_Formal (F);
declare
Expected_Mode : constant array (Boolean) of Entity_Kind :=
(False => E_In_Parameter,
True => E_Out_Parameter);
begin
if Parameter_Mode (F) /= Expected_Mode (Is_Read) then
return False;
end if;
end;
Typ := Etype (F);
-- If the attribute specification comes from an aspect
-- specification for a class-wide stream, the parameter must be
-- a class-wide type of the entity to which the aspect applies.
if From_Aspect_Specification (N)
and then Class_Present (Parent (N))
and then Is_Class_Wide_Type (Typ)
then
Typ := Etype (Typ);
end if;
else
Typ := Etype (Subp);
end if;
-- Verify that the prefix of the attribute and the local name for
-- the type of the formal match, or one is the class-wide of the
-- other, in the case of a class-wide stream operation.
if Base_Type (Typ) = Base_Type (Ent)
or else (Is_Class_Wide_Type (Typ)
and then Typ = Class_Wide_Type (Base_Type (Ent)))
or else (Is_Class_Wide_Type (Ent)
and then Ent = Class_Wide_Type (Base_Type (Typ)))
then
null;
else
return False;
end if;
if Present (Next_Formal (F)) then
return False;
elsif not Is_Scalar_Type (Typ)
and then not Is_First_Subtype (Typ)
and then not Is_Class_Wide_Type (Typ)
then
if Report and not Is_First_Subtype (Typ) then
Error_Msg_N
("subtype of formal in stream operation must be a first "
& "subtype", Parameter_Type (Parent (F)));
end if;
return False;
else
return True;
end if;
end Has_Good_Profile;
-- Start of processing for Analyze_Stream_TSS_Definition
begin
FOnly := True;
if not Is_Type (U_Ent) then
Error_Msg_N ("local name must be a subtype", Nam);
return;
elsif not Is_First_Subtype (U_Ent) then
Error_Msg_N ("local name must be a first subtype", Nam);
return;
end if;
Pnam := TSS (Base_Type (U_Ent), TSS_Nam);
-- If Pnam is present, it can be either inherited from an ancestor
-- type (in which case it is legal to redefine it for this type), or
-- be a previous definition of the attribute for the same type (in
-- which case it is illegal).
-- In the first case, it will have been analyzed already, and we
-- can check that its profile does not match the expected profile
-- for a stream attribute of U_Ent. In the second case, either Pnam
-- has been analyzed (and has the expected profile), or it has not
-- been analyzed yet (case of a type that has not been frozen yet
-- and for which the stream attribute has been set using Set_TSS).
if Present (Pnam)
and then (No (First_Entity (Pnam)) or else Has_Good_Profile (Pnam))
then
Error_Msg_Sloc := Sloc (Pnam);
Error_Msg_Name_1 := Attr;
Error_Msg_N ("% attribute already defined #", Nam);
return;
end if;
Analyze (Expr);
if Is_Entity_Name (Expr) then
if not Is_Overloaded (Expr) then
if Has_Good_Profile (Entity (Expr), Report => True) then
Subp := Entity (Expr);
end if;
else
Get_First_Interp (Expr, I, It);
while Present (It.Nam) loop
if Has_Good_Profile (It.Nam) then
Subp := It.Nam;
exit;
end if;
Get_Next_Interp (I, It);
end loop;
end if;
end if;
if Present (Subp) then
if Is_Abstract_Subprogram (Subp) then
Error_Msg_N ("stream subprogram must not be abstract", Expr);
return;
-- A stream subprogram for an interface type must be a null
-- procedure (RM 13.13.2 (38/3)). Note that the class-wide type
-- of an interface is not an interface type (3.9.4 (6.b/2)).
elsif Is_Interface (U_Ent)
and then not Is_Class_Wide_Type (U_Ent)
and then not Inside_A_Generic
and then
(Ekind (Subp) = E_Function
or else
not Null_Present
(Specification
(Unit_Declaration_Node (Ultimate_Alias (Subp)))))
then
Error_Msg_N
("stream subprogram for interface type must be null "
& "procedure", Expr);
end if;
Set_Entity (Expr, Subp);
Set_Etype (Expr, Etype (Subp));
New_Stream_Subprogram (N, U_Ent, Subp, TSS_Nam);
else
Error_Msg_Name_1 := Attr;
Error_Msg_N ("incorrect expression for% attribute", Expr);
end if;
end Analyze_Stream_TSS_Definition;
------------------------------
-- Check_Indexing_Functions --
------------------------------
procedure Check_Indexing_Functions is
Indexing_Found : Boolean := False;
procedure Check_Inherited_Indexing;
-- For a derived type, check that no indexing aspect is specified
-- for the type if it is also inherited
procedure Check_One_Function (Subp : Entity_Id);
-- Check one possible interpretation. Sets Indexing_Found True if a
-- legal indexing function is found.
procedure Illegal_Indexing (Msg : String);
-- Diagnose illegal indexing function if not overloaded. In the
-- overloaded case indicate that no legal interpretation exists.
------------------------------
-- Check_Inherited_Indexing --
------------------------------
procedure Check_Inherited_Indexing is
Inherited : Node_Id;
begin
if Attr = Name_Constant_Indexing then
Inherited :=
Find_Aspect (Etype (Ent), Aspect_Constant_Indexing);
else pragma Assert (Attr = Name_Variable_Indexing);
Inherited :=
Find_Aspect (Etype (Ent), Aspect_Variable_Indexing);
end if;
if Present (Inherited) then
if Debug_Flag_Dot_XX then
null;
-- OK if current attribute_definition_clause is expansion of
-- inherited aspect.
elsif Aspect_Rep_Item (Inherited) = N then
null;
-- Indicate the operation that must be overridden, rather than
-- redefining the indexing aspect.
else
Illegal_Indexing
("indexing function already inherited from parent type");
Error_Msg_NE
("!override & instead",
N, Entity (Expression (Inherited)));
end if;
end if;
end Check_Inherited_Indexing;
------------------------
-- Check_One_Function --
------------------------
procedure Check_One_Function (Subp : Entity_Id) is
Default_Element : Node_Id;
Ret_Type : constant Entity_Id := Etype (Subp);
begin
if not Is_Overloadable (Subp) then
Illegal_Indexing ("illegal indexing function for type&");
return;
elsif Scope (Subp) /= Scope (Ent) then
if Nkind (Expr) = N_Expanded_Name then
-- Indexing function can't be declared elsewhere
Illegal_Indexing
("indexing function must be declared in scope of type&");
end if;
return;
elsif No (First_Formal (Subp)) then
Illegal_Indexing
("Indexing requires a function that applies to type&");
return;
elsif No (Next_Formal (First_Formal (Subp))) then
Illegal_Indexing
("indexing function must have at least two parameters");
return;
elsif Is_Derived_Type (Ent) then
Check_Inherited_Indexing;
end if;
if not Check_Primitive_Function (Subp) then
Illegal_Indexing
("Indexing aspect requires a function that applies to type&");
return;
end if;
-- If partial declaration exists, verify that it is not tagged.
if Ekind (Current_Scope) = E_Package
and then Has_Private_Declaration (Ent)
and then From_Aspect_Specification (N)
and then
List_Containing (Parent (Ent)) =
Private_Declarations
(Specification (Unit_Declaration_Node (Current_Scope)))
and then Nkind (N) = N_Attribute_Definition_Clause
then
declare
Decl : Node_Id;
begin
Decl :=
First (Visible_Declarations
(Specification
(Unit_Declaration_Node (Current_Scope))));
while Present (Decl) loop
if Nkind (Decl) = N_Private_Type_Declaration
and then Ent = Full_View (Defining_Identifier (Decl))
and then Tagged_Present (Decl)
and then No (Aspect_Specifications (Decl))
then
Illegal_Indexing
("Indexing aspect cannot be specified on full view "
& "if partial view is tagged");
return;
end if;
Next (Decl);
end loop;
end;
end if;
-- An indexing function must return either the default element of
-- the container, or a reference type. For variable indexing it
-- must be the latter.
Default_Element :=
Find_Value_Of_Aspect
(Etype (First_Formal (Subp)), Aspect_Iterator_Element);
if Present (Default_Element) then
Analyze (Default_Element);
end if;
-- For variable_indexing the return type must be a reference type
if Attr = Name_Variable_Indexing then
if not Has_Implicit_Dereference (Ret_Type) then
Illegal_Indexing
("variable indexing must return a reference type");
return;
elsif Is_Access_Constant
(Etype (First_Discriminant (Ret_Type)))
then
Illegal_Indexing
("variable indexing must return an access to variable");
return;
end if;
else
if Has_Implicit_Dereference (Ret_Type)
and then not
Is_Access_Constant (Etype (First_Discriminant (Ret_Type)))
then
Illegal_Indexing
("constant indexing must return an access to constant");
return;
elsif Is_Access_Type (Etype (First_Formal (Subp)))
and then not Is_Access_Constant (Etype (First_Formal (Subp)))
then
Illegal_Indexing
("constant indexing must apply to an access to constant");
return;
end if;
end if;
-- All checks succeeded.
Indexing_Found := True;
end Check_One_Function;
-----------------------
-- Illegal_Indexing --
-----------------------
procedure Illegal_Indexing (Msg : String) is
begin
Error_Msg_NE (Msg, N, Ent);
end Illegal_Indexing;
-- Start of processing for Check_Indexing_Functions
begin
if In_Instance then
Check_Inherited_Indexing;
end if;
Analyze (Expr);
if not Is_Overloaded (Expr) then
Check_One_Function (Entity (Expr));
else
declare
I : Interp_Index;
It : Interp;
begin
Indexing_Found := False;
Get_First_Interp (Expr, I, It);
while Present (It.Nam) loop
-- Note that analysis will have added the interpretation
-- that corresponds to the dereference. We only check the
-- subprogram itself. Ignore homonyms that may come from
-- derived types in the context.
if Is_Overloadable (It.Nam)
and then Comes_From_Source (It.Nam)
then
Check_One_Function (It.Nam);
end if;
Get_Next_Interp (I, It);
end loop;
end;
end if;
if not Indexing_Found and then not Error_Posted (N) then
Error_Msg_NE
("aspect Indexing requires a local function that applies to "
& "type&", Expr, Ent);
end if;
end Check_Indexing_Functions;
------------------------------
-- Check_Iterator_Functions --
------------------------------
procedure Check_Iterator_Functions is
function Valid_Default_Iterator (Subp : Entity_Id) return Boolean;
-- Check one possible interpretation for validity
----------------------------
-- Valid_Default_Iterator --
----------------------------
function Valid_Default_Iterator (Subp : Entity_Id) return Boolean is
Root_T : constant Entity_Id := Root_Type (Etype (Etype (Subp)));
Formal : Entity_Id;
begin
if not Check_Primitive_Function (Subp) then
return False;
-- The return type must be derived from a type in an instance
-- of Iterator.Interfaces, and thus its root type must have a
-- predefined name.
elsif Chars (Root_T) /= Name_Forward_Iterator
and then Chars (Root_T) /= Name_Reversible_Iterator
then
return False;
else
Formal := First_Formal (Subp);
end if;
-- False if any subsequent formal has no default expression
Formal := Next_Formal (Formal);
while Present (Formal) loop
if No (Expression (Parent (Formal))) then
return False;
end if;
Next_Formal (Formal);
end loop;
-- True if all subsequent formals have default expressions
return True;
end Valid_Default_Iterator;
-- Start of processing for Check_Iterator_Functions
begin
Analyze (Expr);
if not Is_Entity_Name (Expr) then
Error_Msg_N ("aspect Iterator must be a function name", Expr);
end if;
if not Is_Overloaded (Expr) then
if not Check_Primitive_Function (Entity (Expr)) then
Error_Msg_NE
("aspect Indexing requires a function that applies to type&",
Entity (Expr), Ent);
end if;
-- Flag the default_iterator as well as the denoted function.
if not Valid_Default_Iterator (Entity (Expr)) then
Error_Msg_N ("improper function for default iterator!", Expr);
end if;
else
declare
Default : Entity_Id := Empty;
I : Interp_Index;
It : Interp;
begin
Get_First_Interp (Expr, I, It);
while Present (It.Nam) loop
if not Check_Primitive_Function (It.Nam)
or else not Valid_Default_Iterator (It.Nam)
then
Remove_Interp (I);
elsif Present (Default) then
-- An explicit one should override an implicit one
if Comes_From_Source (Default) =
Comes_From_Source (It.Nam)
then
Error_Msg_N ("default iterator must be unique", Expr);
Error_Msg_Sloc := Sloc (Default);
Error_Msg_N ("\\possible interpretation#", Expr);
Error_Msg_Sloc := Sloc (It.Nam);
Error_Msg_N ("\\possible interpretation#", Expr);
elsif Comes_From_Source (It.Nam) then
Default := It.Nam;
end if;
else
Default := It.Nam;
end if;
Get_Next_Interp (I, It);
end loop;
if Present (Default) then
Set_Entity (Expr, Default);
Set_Is_Overloaded (Expr, False);
else
Error_Msg_N
("no interpretation is a valid default iterator!", Expr);
end if;
end;
end if;
end Check_Iterator_Functions;
-------------------------------
-- Check_Primitive_Function --
-------------------------------
function Check_Primitive_Function (Subp : Entity_Id) return Boolean is
Ctrl : Entity_Id;
begin
if Ekind (Subp) /= E_Function then
return False;
end if;
if No (First_Formal (Subp)) then
return False;
else
Ctrl := Etype (First_Formal (Subp));
end if;
-- To be a primitive operation subprogram has to be in same scope.
if Scope (Ctrl) /= Scope (Subp) then
return False;
end if;
-- Type of formal may be the class-wide type, an access to such,
-- or an incomplete view.
if Ctrl = Ent
or else Ctrl = Class_Wide_Type (Ent)
or else
(Ekind (Ctrl) = E_Anonymous_Access_Type
and then (Designated_Type (Ctrl) = Ent
or else
Designated_Type (Ctrl) = Class_Wide_Type (Ent)))
or else
(Ekind (Ctrl) = E_Incomplete_Type
and then Full_View (Ctrl) = Ent)
then
null;
else
return False;
end if;
return True;
end Check_Primitive_Function;
----------------------
-- Duplicate_Clause --
----------------------
function Duplicate_Clause return Boolean is
A : Node_Id;
begin
-- Nothing to do if this attribute definition clause comes from
-- an aspect specification, since we could not be duplicating an
-- explicit clause, and we dealt with the case of duplicated aspects
-- in Analyze_Aspect_Specifications.
if From_Aspect_Specification (N) then
return False;
end if;
-- Otherwise current clause may duplicate previous clause, or a
-- previously given pragma or aspect specification for the same
-- aspect.
A := Get_Rep_Item (U_Ent, Chars (N), Check_Parents => False);
if Present (A) then
Error_Msg_Name_1 := Chars (N);
Error_Msg_Sloc := Sloc (A);
Error_Msg_NE ("aspect% for & previously given#", N, U_Ent);
return True;
end if;
return False;
end Duplicate_Clause;
-- Start of processing for Analyze_Attribute_Definition_Clause
begin
-- The following code is a defense against recursion. Not clear that
-- this can happen legitimately, but perhaps some error situations can
-- cause it, and we did see this recursion during testing.
if Analyzed (N) then
return;
else
Set_Analyzed (N, True);
end if;
Check_Restriction_No_Use_Of_Attribute (N);
-- Ignore some selected attributes in CodePeer mode since they are not
-- relevant in this context.
if CodePeer_Mode then
case Id is
-- Ignore Component_Size in CodePeer mode, to avoid changing the
-- internal representation of types by implicitly packing them.
when Attribute_Component_Size =>
Rewrite (N, Make_Null_Statement (Sloc (N)));
return;
when others =>
null;
end case;
end if;
-- Process Ignore_Rep_Clauses option
if Ignore_Rep_Clauses then
case Id is
-- The following should be ignored. They do not affect legality
-- and may be target dependent. The basic idea of -gnatI is to
-- ignore any rep clauses that may be target dependent but do not
-- affect legality (except possibly to be rejected because they
-- are incompatible with the compilation target).
when Attribute_Alignment
| Attribute_Bit_Order
| Attribute_Component_Size
| Attribute_Default_Scalar_Storage_Order
| Attribute_Machine_Radix
| Attribute_Object_Size
| Attribute_Scalar_Storage_Order
| Attribute_Size
| Attribute_Small
| Attribute_Stream_Size
| Attribute_Value_Size
=>
Kill_Rep_Clause (N);
return;
-- The following should not be ignored, because in the first place
-- they are reasonably portable, and should not cause problems
-- in compiling code from another target, and also they do affect
-- legality, e.g. failing to provide a stream attribute for a type
-- may make a program illegal.
when Attribute_External_Tag
| Attribute_Input
| Attribute_Output
| Attribute_Read
| Attribute_Simple_Storage_Pool
| Attribute_Storage_Pool
| Attribute_Storage_Size
| Attribute_Write
=>
null;
-- We do not do anything here with address clauses, they will be
-- removed by Freeze later on, but for now, it works better to
-- keep them in the tree.
when Attribute_Address =>
null;
-- Other cases are errors ("attribute& cannot be set with
-- definition clause"), which will be caught below.
when others =>
null;
end case;
end if;
Analyze (Nam);
Ent := Entity (Nam);
if Rep_Item_Too_Early (Ent, N) then
return;
end if;
-- Rep clause applies to full view of incomplete type or private type if
-- we have one (if not, this is a premature use of the type). However,
-- certain semantic checks need to be done on the specified entity (i.e.
-- the private view), so we save it in Ent.
if Is_Private_Type (Ent)
and then Is_Derived_Type (Ent)
and then not Is_Tagged_Type (Ent)
and then No (Full_View (Ent))
then
-- If this is a private type whose completion is a derivation from
-- another private type, there is no full view, and the attribute
-- belongs to the type itself, not its underlying parent.
U_Ent := Ent;
elsif Ekind (Ent) = E_Incomplete_Type then
-- The attribute applies to the full view, set the entity of the
-- attribute definition accordingly.
Ent := Underlying_Type (Ent);
U_Ent := Ent;
Set_Entity (Nam, Ent);
else
U_Ent := Underlying_Type (Ent);
end if;
-- Avoid cascaded error
if Etype (Nam) = Any_Type then
return;
-- Must be declared in current scope or in case of an aspect
-- specification, must be visible in current scope.
elsif Scope (Ent) /= Current_Scope
and then
not (From_Aspect_Specification (N)
and then Scope_Within_Or_Same (Current_Scope, Scope (Ent)))
then
Error_Msg_N ("entity must be declared in this scope", Nam);
return;
-- Must not be a source renaming (we do have some cases where the
-- expander generates a renaming, and those cases are OK, in such
-- cases any attribute applies to the renamed object as well).
elsif Is_Object (Ent)
and then Present (Renamed_Object (Ent))
then
-- Case of renamed object from source, this is an error
if Comes_From_Source (Renamed_Object (Ent)) then
Get_Name_String (Chars (N));
Error_Msg_Strlen := Name_Len;
Error_Msg_String (1 .. Name_Len) := Name_Buffer (1 .. Name_Len);
Error_Msg_N
("~ clause not allowed for a renaming declaration "
& "(RM 13.1(6))", Nam);
return;
-- For the case of a compiler generated renaming, the attribute
-- definition clause applies to the renamed object created by the
-- expander. The easiest general way to handle this is to create a
-- copy of the attribute definition clause for this object.
elsif Is_Entity_Name (Renamed_Object (Ent)) then
Insert_Action (N,
Make_Attribute_Definition_Clause (Loc,
Name =>
New_Occurrence_Of (Entity (Renamed_Object (Ent)), Loc),
Chars => Chars (N),
Expression => Duplicate_Subexpr (Expression (N))));
-- If the renamed object is not an entity, it must be a dereference
-- of an unconstrained function call, and we must introduce a new
-- declaration to capture the expression. This is needed in the case
-- of 'Alignment, where the original declaration must be rewritten.
else
pragma Assert
(Nkind (Renamed_Object (Ent)) = N_Explicit_Dereference);
null;
end if;
-- If no underlying entity, use entity itself, applies to some
-- previously detected error cases ???
elsif No (U_Ent) then
U_Ent := Ent;
-- Cannot specify for a subtype (exception Object/Value_Size)
elsif Is_Type (U_Ent)
and then not Is_First_Subtype (U_Ent)
and then Id /= Attribute_Object_Size
and then Id /= Attribute_Value_Size
and then not From_At_Mod (N)
then
Error_Msg_N ("cannot specify attribute for subtype", Nam);
return;
end if;
Set_Entity (N, U_Ent);
-- Switch on particular attribute
case Id is
-------------
-- Address --
-------------
-- Address attribute definition clause
when Attribute_Address => Address : begin
-- A little error check, catch for X'Address use X'Address;
if Nkind (Nam) = N_Identifier
and then Nkind (Expr) = N_Attribute_Reference
and then Attribute_Name (Expr) = Name_Address
and then Nkind (Prefix (Expr)) = N_Identifier
and then Chars (Nam) = Chars (Prefix (Expr))
then
Error_Msg_NE
("address for & is self-referencing", Prefix (Expr), Ent);
return;
end if;
-- Not that special case, carry on with analysis of expression
Analyze_And_Resolve (Expr, RTE (RE_Address));
-- Even when ignoring rep clauses we need to indicate that the
-- entity has an address clause and thus it is legal to declare
-- it imported. Freeze will get rid of the address clause later.
-- Also call Set_Address_Taken to indicate that an address clause
-- was present, even if we are about to remove it.
if Ignore_Rep_Clauses then
Set_Address_Taken (U_Ent);
if Ekind_In (U_Ent, E_Variable, E_Constant) then
Record_Rep_Item (U_Ent, N);
end if;
return;
end if;
if Duplicate_Clause then
null;
-- Case of address clause for subprogram
elsif Is_Subprogram (U_Ent) then
if Has_Homonym (U_Ent) then
Error_Msg_N
("address clause cannot be given for overloaded "
& "subprogram", Nam);
return;
end if;
-- For subprograms, all address clauses are permitted, and we
-- mark the subprogram as having a deferred freeze so that Gigi
-- will not elaborate it too soon.
-- Above needs more comments, what is too soon about???
Set_Has_Delayed_Freeze (U_Ent);
-- Case of address clause for entry
elsif Ekind (U_Ent) = E_Entry then
if Nkind (Parent (N)) = N_Task_Body then
Error_Msg_N
("entry address must be specified in task spec", Nam);
return;
end if;
-- For entries, we require a constant address
Check_Constant_Address_Clause (Expr, U_Ent);
-- Special checks for task types
if Is_Task_Type (Scope (U_Ent))
and then Comes_From_Source (Scope (U_Ent))
then
Error_Msg_N
("??entry address declared for entry in task type", N);
Error_Msg_N
("\??only one task can be declared of this type", N);
end if;
-- Entry address clauses are obsolescent
Check_Restriction (No_Obsolescent_Features, N);
if Warn_On_Obsolescent_Feature then
Error_Msg_N
("?j?attaching interrupt to task entry is an obsolescent "
& "feature (RM J.7.1)", N);
Error_Msg_N
("\?j?use interrupt procedure instead", N);
end if;
-- Case of an address clause for a class-wide object, which is
-- considered erroneous.
elsif Is_Class_Wide_Type (Etype (U_Ent)) then
Error_Msg_NE
("??class-wide object & must not be overlaid", Nam, U_Ent);
Error_Msg_N
("\??Program_Error will be raised at run time", Nam);
Insert_Action (Declaration_Node (U_Ent),
Make_Raise_Program_Error (Loc,
Reason => PE_Overlaid_Controlled_Object));
return;
-- Case of address clause for an object
elsif Ekind_In (U_Ent, E_Constant, E_Variable) then
declare
Expr : constant Node_Id := Expression (N);
O_Ent : Entity_Id;
Off : Boolean;
begin
-- Exported variables cannot have an address clause, because
-- this cancels the effect of the pragma Export.
if Is_Exported (U_Ent) then
Error_Msg_N
("cannot export object with address clause", Nam);
return;
end if;
Find_Overlaid_Entity (N, O_Ent, Off);
if Present (O_Ent) then
-- If the object overlays a constant object, mark it so
if Is_Constant_Object (O_Ent) then
Set_Overlays_Constant (U_Ent);
end if;
-- If the address clause is of the form:
-- for X'Address use Y'Address;
-- or
-- C : constant Address := Y'Address;
-- ...
-- for X'Address use C;
-- then we make an entry in the table to check the size
-- and alignment of the overlaying variable. But we defer
-- this check till after code generation to take full
-- advantage of the annotation done by the back end.
-- If the entity has a generic type, the check will be
-- performed in the instance if the actual type justifies
-- it, and we do not insert the clause in the table to
-- prevent spurious warnings.
-- Note: we used to test Comes_From_Source and only give
-- this warning for source entities, but we have removed
-- this test. It really seems bogus to generate overlays
-- that would trigger this warning in generated code.
-- Furthermore, by removing the test, we handle the
-- aspect case properly.
if Is_Object (O_Ent)
and then not Is_Generic_Type (Etype (U_Ent))
and then Address_Clause_Overlay_Warnings
then
Register_Address_Clause_Check
(N, U_Ent, No_Uint, O_Ent, Off);
end if;
-- If the overlay changes the storage order, mark the
-- entity as being volatile to block any optimization
-- for it since the construct is not really supported
-- by the back end.
if (Is_Record_Type (Etype (U_Ent))
or else Is_Array_Type (Etype (U_Ent)))
and then (Is_Record_Type (Etype (O_Ent))
or else Is_Array_Type (Etype (O_Ent)))
and then Reverse_Storage_Order (Etype (U_Ent)) /=
Reverse_Storage_Order (Etype (O_Ent))
then
Set_Treat_As_Volatile (U_Ent);
end if;
else
-- If this is not an overlay, mark a variable as being
-- volatile to prevent unwanted optimizations. It's a
-- conservative interpretation of RM 13.3(19) for the
-- cases where the compiler cannot detect potential
-- aliasing issues easily and it also covers the case
-- of an absolute address where the volatile aspect is
-- kind of implicit.
if Ekind (U_Ent) = E_Variable then
Set_Treat_As_Volatile (U_Ent);
end if;
-- Make an entry in the table for an absolute address as
-- above to check that the value is compatible with the
-- alignment of the object.
declare
Addr : constant Node_Id := Address_Value (Expr);
begin
if Compile_Time_Known_Value (Addr)
and then Address_Clause_Overlay_Warnings
then
Register_Address_Clause_Check
(N, U_Ent, Expr_Value (Addr), Empty, False);
end if;
end;
end if;
-- Issue an unconditional warning for a constant overlaying
-- a variable. For the reverse case, we will issue it only
-- if the variable is modified.
if Ekind (U_Ent) = E_Constant
and then Present (O_Ent)
and then not Overlays_Constant (U_Ent)
and then Address_Clause_Overlay_Warnings
then
Error_Msg_N ("??constant overlays a variable", Expr);
-- Imported variables can have an address clause, but then
-- the import is pretty meaningless except to suppress
-- initializations, so we do not need such variables to
-- be statically allocated (and in fact it causes trouble
-- if the address clause is a local value).
elsif Is_Imported (U_Ent) then
Set_Is_Statically_Allocated (U_Ent, False);
end if;
-- We mark a possible modification of a variable with an
-- address clause, since it is likely aliasing is occurring.
Note_Possible_Modification (Nam, Sure => False);
-- Legality checks on the address clause for initialized
-- objects is deferred until the freeze point, because
-- a subsequent pragma might indicate that the object
-- is imported and thus not initialized. Also, the address
-- clause might involve entities that have yet to be
-- elaborated.
Set_Has_Delayed_Freeze (U_Ent);
-- If an initialization call has been generated for this
-- object, it needs to be deferred to after the freeze node
-- we have just now added, otherwise GIGI will see a
-- reference to the variable (as actual to the IP call)
-- before its definition.
declare
Init_Call : constant Node_Id :=
Remove_Init_Call (U_Ent, N);
begin
if Present (Init_Call) then
Append_Freeze_Action (U_Ent, Init_Call);
-- Reset Initialization_Statements pointer so that
-- if there is a pragma Import further down, it can
-- clear any default initialization.
Set_Initialization_Statements (U_Ent, Init_Call);
end if;
end;
-- Entity has delayed freeze, so we will generate an
-- alignment check at the freeze point unless suppressed.
if not Range_Checks_Suppressed (U_Ent)
and then not Alignment_Checks_Suppressed (U_Ent)
then
Set_Check_Address_Alignment (N);
end if;
-- Kill the size check code, since we are not allocating
-- the variable, it is somewhere else.
Kill_Size_Check_Code (U_Ent);
end;
-- Not a valid entity for an address clause
else
Error_Msg_N ("address cannot be given for &", Nam);
end if;
end Address;
---------------
-- Alignment --
---------------
-- Alignment attribute definition clause
when Attribute_Alignment => Alignment : declare
Align : constant Uint := Get_Alignment_Value (Expr);
Max_Align : constant Uint := UI_From_Int (Maximum_Alignment);
begin
FOnly := True;
if not Is_Type (U_Ent)
and then Ekind (U_Ent) /= E_Variable
and then Ekind (U_Ent) /= E_Constant
then
Error_Msg_N ("alignment cannot be given for &", Nam);
elsif Duplicate_Clause then
null;
elsif Align /= No_Uint then
Set_Has_Alignment_Clause (U_Ent);
-- Tagged type case, check for attempt to set alignment to a
-- value greater than Max_Align, and reset if so. This error
-- is suppressed in ASIS mode to allow for different ASIS
-- back ends or ASIS-based tools to query the illegal clause.
if Is_Tagged_Type (U_Ent)
and then Align > Max_Align
and then not ASIS_Mode
then
Error_Msg_N
("alignment for & set to Maximum_Aligment??", Nam);
Set_Alignment (U_Ent, Max_Align);
-- All other cases
else
Set_Alignment (U_Ent, Align);
end if;
-- For an array type, U_Ent is the first subtype. In that case,
-- also set the alignment of the anonymous base type so that
-- other subtypes (such as the itypes for aggregates of the
-- type) also receive the expected alignment.
if Is_Array_Type (U_Ent) then
Set_Alignment (Base_Type (U_Ent), Align);
end if;
end if;
end Alignment;
---------------
-- Bit_Order --
---------------
-- Bit_Order attribute definition clause
when Attribute_Bit_Order =>
if not Is_Record_Type (U_Ent) then
Error_Msg_N
("Bit_Order can only be defined for record type", Nam);
elsif Duplicate_Clause then
null;
else
Analyze_And_Resolve (Expr, RTE (RE_Bit_Order));
if Etype (Expr) = Any_Type then
return;
elsif not Is_OK_Static_Expression (Expr) then
Flag_Non_Static_Expr
("Bit_Order requires static expression!", Expr);
else
if (Expr_Value (Expr) = 0) /= Bytes_Big_Endian then
Set_Reverse_Bit_Order (Base_Type (U_Ent), True);
end if;
end if;
end if;
--------------------
-- Component_Size --
--------------------
-- Component_Size attribute definition clause
when Attribute_Component_Size => Component_Size_Case : declare
Csize : constant Uint := Static_Integer (Expr);
Ctyp : Entity_Id;
Btype : Entity_Id;
Biased : Boolean;
New_Ctyp : Entity_Id;
Decl : Node_Id;
begin
if not Is_Array_Type (U_Ent) then
Error_Msg_N ("component size requires array type", Nam);
return;
end if;
Btype := Base_Type (U_Ent);
Ctyp := Component_Type (Btype);
if Duplicate_Clause then
null;
elsif Rep_Item_Too_Early (Btype, N) then
null;
elsif Csize /= No_Uint then
Check_Size (Expr, Ctyp, Csize, Biased);
-- For the biased case, build a declaration for a subtype that
-- will be used to represent the biased subtype that reflects
-- the biased representation of components. We need the subtype
-- to get proper conversions on referencing elements of the
-- array.
if Biased then
New_Ctyp :=
Make_Defining_Identifier (Loc,
Chars =>
New_External_Name (Chars (U_Ent), 'C', 0, 'T'));
Decl :=
Make_Subtype_Declaration (Loc,
Defining_Identifier => New_Ctyp,
Subtype_Indication =>
New_Occurrence_Of (Component_Type (Btype), Loc));
Set_Parent (Decl, N);
Analyze (Decl, Suppress => All_Checks);
Set_Has_Delayed_Freeze (New_Ctyp, False);
Set_Esize (New_Ctyp, Csize);
Set_RM_Size (New_Ctyp, Csize);
Init_Alignment (New_Ctyp);
Set_Is_Itype (New_Ctyp, True);
Set_Associated_Node_For_Itype (New_Ctyp, U_Ent);
Set_Component_Type (Btype, New_Ctyp);
Set_Biased (New_Ctyp, N, "component size clause");
end if;
Set_Component_Size (Btype, Csize);
-- Deal with warning on overridden size
if Warn_On_Overridden_Size
and then Has_Size_Clause (Ctyp)
and then RM_Size (Ctyp) /= Csize
then
Error_Msg_NE
("component size overrides size clause for&?S?", N, Ctyp);
end if;
Set_Has_Component_Size_Clause (Btype, True);
Set_Has_Non_Standard_Rep (Btype, True);
end if;
end Component_Size_Case;
-----------------------
-- Constant_Indexing --
-----------------------
when Attribute_Constant_Indexing =>
Check_Indexing_Functions;
---------
-- CPU --
---------
when Attribute_CPU =>
-- CPU attribute definition clause not allowed except from aspect
-- specification.
if From_Aspect_Specification (N) then
if not Is_Task_Type (U_Ent) then
Error_Msg_N ("CPU can only be defined for task", Nam);
elsif Duplicate_Clause then
null;
else
-- The expression must be analyzed in the special manner
-- described in "Handling of Default and Per-Object
-- Expressions" in sem.ads.
-- The visibility to the discriminants must be restored
Push_Scope_And_Install_Discriminants (U_Ent);
Preanalyze_Spec_Expression (Expr, RTE (RE_CPU_Range));
Uninstall_Discriminants_And_Pop_Scope (U_Ent);
if not Is_OK_Static_Expression (Expr) then
Check_Restriction (Static_Priorities, Expr);
end if;
end if;
else
Error_Msg_N
("attribute& cannot be set with definition clause", N);
end if;
----------------------
-- Default_Iterator --
----------------------
when Attribute_Default_Iterator => Default_Iterator : declare
Func : Entity_Id;
Typ : Entity_Id;
begin
-- If target type is untagged, further checks are irrelevant
if not Is_Tagged_Type (U_Ent) then
Error_Msg_N
("aspect Default_Iterator applies to tagged type", Nam);
return;
end if;
Check_Iterator_Functions;
Analyze (Expr);
if not Is_Entity_Name (Expr)
or else Ekind (Entity (Expr)) /= E_Function
then
Error_Msg_N ("aspect Iterator must be a function", Expr);
return;
else
Func := Entity (Expr);
end if;
-- The type of the first parameter must be T, T'class, or a
-- corresponding access type (5.5.1 (8/3). If function is
-- parameterless label type accordingly.
if No (First_Formal (Func)) then
Typ := Any_Type;
else
Typ := Etype (First_Formal (Func));
end if;
if Typ = U_Ent
or else Typ = Class_Wide_Type (U_Ent)
or else (Is_Access_Type (Typ)
and then Designated_Type (Typ) = U_Ent)
or else (Is_Access_Type (Typ)
and then Designated_Type (Typ) =
Class_Wide_Type (U_Ent))
then
null;
else
Error_Msg_NE
("Default Iterator must be a primitive of&", Func, U_Ent);
end if;
end Default_Iterator;
------------------------
-- Dispatching_Domain --
------------------------
when Attribute_Dispatching_Domain =>
-- Dispatching_Domain attribute definition clause not allowed
-- except from aspect specification.
if From_Aspect_Specification (N) then
if not Is_Task_Type (U_Ent) then
Error_Msg_N
("Dispatching_Domain can only be defined for task", Nam);
elsif Duplicate_Clause then
null;
else
-- The expression must be analyzed in the special manner
-- described in "Handling of Default and Per-Object
-- Expressions" in sem.ads.
-- The visibility to the discriminants must be restored
Push_Scope_And_Install_Discriminants (U_Ent);
Preanalyze_Spec_Expression
(Expr, RTE (RE_Dispatching_Domain));
Uninstall_Discriminants_And_Pop_Scope (U_Ent);
end if;
else
Error_Msg_N
("attribute& cannot be set with definition clause", N);
end if;
------------------
-- External_Tag --
------------------
when Attribute_External_Tag =>
if not Is_Tagged_Type (U_Ent) then
Error_Msg_N ("should be a tagged type", Nam);
end if;
if Duplicate_Clause then
null;
else
Analyze_And_Resolve (Expr, Standard_String);
if not Is_OK_Static_Expression (Expr) then
Flag_Non_Static_Expr
("static string required for tag name!", Nam);
end if;
if not Is_Library_Level_Entity (U_Ent) then
Error_Msg_NE
("??non-unique external tag supplied for &", N, U_Ent);
Error_Msg_N
("\??same external tag applies to all subprogram calls",
N);
Error_Msg_N
("\??corresponding internal tag cannot be obtained", N);
end if;
end if;
--------------------------
-- Implicit_Dereference --
--------------------------
when Attribute_Implicit_Dereference =>
-- Legality checks already performed at the point of the type
-- declaration, aspect is not delayed.
null;
-----------
-- Input --
-----------
when Attribute_Input =>
Analyze_Stream_TSS_Definition (TSS_Stream_Input);
Set_Has_Specified_Stream_Input (Ent);
------------------------
-- Interrupt_Priority --
------------------------
when Attribute_Interrupt_Priority =>
-- Interrupt_Priority attribute definition clause not allowed
-- except from aspect specification.
if From_Aspect_Specification (N) then
if not Is_Concurrent_Type (U_Ent) then
Error_Msg_N
("Interrupt_Priority can only be defined for task and "
& "protected object", Nam);
elsif Duplicate_Clause then
null;
else
-- The expression must be analyzed in the special manner
-- described in "Handling of Default and Per-Object
-- Expressions" in sem.ads.
-- The visibility to the discriminants must be restored
Push_Scope_And_Install_Discriminants (U_Ent);
Preanalyze_Spec_Expression
(Expr, RTE (RE_Interrupt_Priority));
Uninstall_Discriminants_And_Pop_Scope (U_Ent);
-- Check the No_Task_At_Interrupt_Priority restriction
if Is_Task_Type (U_Ent) then
Check_Restriction (No_Task_At_Interrupt_Priority, N);
end if;
end if;
else
Error_Msg_N
("attribute& cannot be set with definition clause", N);
end if;
--------------
-- Iterable --
--------------
when Attribute_Iterable =>
Analyze (Expr);
if Nkind (Expr) /= N_Aggregate then
Error_Msg_N ("aspect Iterable must be an aggregate", Expr);
end if;
declare
Assoc : Node_Id;
begin
Assoc := First (Component_Associations (Expr));
while Present (Assoc) loop
if not Is_Entity_Name (Expression (Assoc)) then
Error_Msg_N ("value must be a function", Assoc);
end if;
Next (Assoc);
end loop;
end;
----------------------
-- Iterator_Element --
----------------------
when Attribute_Iterator_Element =>
Analyze (Expr);
if not Is_Entity_Name (Expr)
or else not Is_Type (Entity (Expr))
then
Error_Msg_N ("aspect Iterator_Element must be a type", Expr);
end if;
-------------------
-- Machine_Radix --
-------------------
-- Machine radix attribute definition clause
when Attribute_Machine_Radix => Machine_Radix : declare
Radix : constant Uint := Static_Integer (Expr);
begin
if not Is_Decimal_Fixed_Point_Type (U_Ent) then
Error_Msg_N ("decimal fixed-point type expected for &", Nam);
elsif Duplicate_Clause then
null;
elsif Radix /= No_Uint then
Set_Has_Machine_Radix_Clause (U_Ent);
Set_Has_Non_Standard_Rep (Base_Type (U_Ent));
if Radix = 2 then
null;
elsif Radix = 10 then
Set_Machine_Radix_10 (U_Ent);
-- The following error is suppressed in ASIS mode to allow for
-- different ASIS back ends or ASIS-based tools to query the
-- illegal clause.
elsif not ASIS_Mode then
Error_Msg_N ("machine radix value must be 2 or 10", Expr);
end if;
end if;
end Machine_Radix;
-----------------
-- Object_Size --
-----------------
-- Object_Size attribute definition clause
when Attribute_Object_Size => Object_Size : declare
Size : constant Uint := Static_Integer (Expr);
Biased : Boolean;
pragma Warnings (Off, Biased);
begin
if not Is_Type (U_Ent) then
Error_Msg_N ("Object_Size cannot be given for &", Nam);
elsif Duplicate_Clause then
null;
else
Check_Size (Expr, U_Ent, Size, Biased);
-- The following errors are suppressed in ASIS mode to allow
-- for different ASIS back ends or ASIS-based tools to query
-- the illegal clause.
if ASIS_Mode then
null;
elsif Is_Scalar_Type (U_Ent) then
if Size /= 8 and then Size /= 16 and then Size /= 32
and then UI_Mod (Size, 64) /= 0
then
Error_Msg_N
("Object_Size must be 8, 16, 32, or multiple of 64",
Expr);
end if;
elsif Size mod 8 /= 0 then
Error_Msg_N ("Object_Size must be a multiple of 8", Expr);
end if;
Set_Esize (U_Ent, Size);
Set_Has_Object_Size_Clause (U_Ent);
Alignment_Check_For_Size_Change (U_Ent, Size);
end if;
end Object_Size;
------------
-- Output --
------------
when Attribute_Output =>
Analyze_Stream_TSS_Definition (TSS_Stream_Output);
Set_Has_Specified_Stream_Output (Ent);
--------------
-- Priority --
--------------
when Attribute_Priority =>
-- Priority attribute definition clause not allowed except from
-- aspect specification.
if From_Aspect_Specification (N) then
if not (Is_Concurrent_Type (U_Ent)
or else Ekind (U_Ent) = E_Procedure)
then
Error_Msg_N
("Priority can only be defined for task and protected "
& "object", Nam);
elsif Duplicate_Clause then
null;
else
-- The expression must be analyzed in the special manner
-- described in "Handling of Default and Per-Object
-- Expressions" in sem.ads.
-- The visibility to the discriminants must be restored
Push_Scope_And_Install_Discriminants (U_Ent);
Preanalyze_Spec_Expression (Expr, Standard_Integer);
Uninstall_Discriminants_And_Pop_Scope (U_Ent);
if not Is_OK_Static_Expression (Expr) then
Check_Restriction (Static_Priorities, Expr);
end if;
end if;
else
Error_Msg_N
("attribute& cannot be set with definition clause", N);
end if;
----------
-- Read --
----------
when Attribute_Read =>
Analyze_Stream_TSS_Definition (TSS_Stream_Read);
Set_Has_Specified_Stream_Read (Ent);
--------------------------
-- Scalar_Storage_Order --
--------------------------
-- Scalar_Storage_Order attribute definition clause
when Attribute_Scalar_Storage_Order =>
if not (Is_Record_Type (U_Ent) or else Is_Array_Type (U_Ent)) then
Error_Msg_N
("Scalar_Storage_Order can only be defined for record or "
& "array type", Nam);
elsif Duplicate_Clause then
null;
else
Analyze_And_Resolve (Expr, RTE (RE_Bit_Order));
if Etype (Expr) = Any_Type then
return;
elsif not Is_OK_Static_Expression (Expr) then
Flag_Non_Static_Expr
("Scalar_Storage_Order requires static expression!", Expr);
elsif (Expr_Value (Expr) = 0) /= Bytes_Big_Endian then
-- Here for the case of a non-default (i.e. non-confirming)
-- Scalar_Storage_Order attribute definition.
if Support_Nondefault_SSO_On_Target then
Set_Reverse_Storage_Order (Base_Type (U_Ent), True);
else
Error_Msg_N
("non-default Scalar_Storage_Order not supported on "
& "target", Expr);
end if;
end if;
-- Clear SSO default indications since explicit setting of the
-- order overrides the defaults.
Set_SSO_Set_Low_By_Default (Base_Type (U_Ent), False);
Set_SSO_Set_High_By_Default (Base_Type (U_Ent), False);
end if;
----------
-- Size --
----------
-- Size attribute definition clause
when Attribute_Size => Size : declare
Size : constant Uint := Static_Integer (Expr);
Etyp : Entity_Id;
Biased : Boolean;
begin
FOnly := True;
if Duplicate_Clause then
null;
elsif not Is_Type (U_Ent)
and then Ekind (U_Ent) /= E_Variable
and then Ekind (U_Ent) /= E_Constant
then
Error_Msg_N ("size cannot be given for &", Nam);
elsif Is_Array_Type (U_Ent)
and then not Is_Constrained (U_Ent)
then
Error_Msg_N
("size cannot be given for unconstrained array", Nam);
elsif Size /= No_Uint then
if Is_Type (U_Ent) then
Etyp := U_Ent;
else
Etyp := Etype (U_Ent);
end if;
-- Check size, note that Gigi is in charge of checking that the
-- size of an array or record type is OK. Also we do not check
-- the size in the ordinary fixed-point case, since it is too
-- early to do so (there may be subsequent small clause that
-- affects the size). We can check the size if a small clause
-- has already been given.
if not Is_Ordinary_Fixed_Point_Type (U_Ent)
or else Has_Small_Clause (U_Ent)
then
Check_Size (Expr, Etyp, Size, Biased);
Set_Biased (U_Ent, N, "size clause", Biased);
end if;
-- For types set RM_Size and Esize if possible
if Is_Type (U_Ent) then
Set_RM_Size (U_Ent, Size);
-- For elementary types, increase Object_Size to power of 2,
-- but not less than a storage unit in any case (normally
-- this means it will be byte addressable).
-- For all other types, nothing else to do, we leave Esize
-- (object size) unset, the back end will set it from the
-- size and alignment in an appropriate manner.
-- In both cases, we check whether the alignment must be
-- reset in the wake of the size change.
if Is_Elementary_Type (U_Ent) then
if Size <= System_Storage_Unit then
Init_Esize (U_Ent, System_Storage_Unit);
elsif Size <= 16 then
Init_Esize (U_Ent, 16);
elsif Size <= 32 then
Init_Esize (U_Ent, 32);
else
Set_Esize (U_Ent, (Size + 63) / 64 * 64);
end if;
Alignment_Check_For_Size_Change (U_Ent, Esize (U_Ent));
else
Alignment_Check_For_Size_Change (U_Ent, Size);
end if;
-- For objects, set Esize only
else
-- The following error is suppressed in ASIS mode to allow
-- for different ASIS back ends or ASIS-based tools to query
-- the illegal clause.
if Is_Elementary_Type (Etyp)
and then Size /= System_Storage_Unit
and then Size /= System_Storage_Unit * 2
and then Size /= System_Storage_Unit * 4
and then Size /= System_Storage_Unit * 8
and then not ASIS_Mode
then
Error_Msg_Uint_1 := UI_From_Int (System_Storage_Unit);
Error_Msg_Uint_2 := Error_Msg_Uint_1 * 8;
Error_Msg_N
("size for primitive object must be a power of 2 in "
& "the range ^-^", N);
end if;
Set_Esize (U_Ent, Size);
end if;
Set_Has_Size_Clause (U_Ent);
end if;
end Size;
-----------
-- Small --
-----------
-- Small attribute definition clause
when Attribute_Small => Small : declare
Implicit_Base : constant Entity_Id := Base_Type (U_Ent);
Small : Ureal;
begin
Analyze_And_Resolve (Expr, Any_Real);
if Etype (Expr) = Any_Type then
return;
elsif not Is_OK_Static_Expression (Expr) then
Flag_Non_Static_Expr
("small requires static expression!", Expr);
return;
else
Small := Expr_Value_R (Expr);
if Small <= Ureal_0 then
Error_Msg_N ("small value must be greater than zero", Expr);
return;
end if;
end if;
if not Is_Ordinary_Fixed_Point_Type (U_Ent) then
Error_Msg_N
("small requires an ordinary fixed point type", Nam);
elsif Has_Small_Clause (U_Ent) then
Error_Msg_N ("small already given for &", Nam);
elsif Small > Delta_Value (U_Ent) then
Error_Msg_N
("small value must not be greater than delta value", Nam);
else
Set_Small_Value (U_Ent, Small);
Set_Small_Value (Implicit_Base, Small);
Set_Has_Small_Clause (U_Ent);
Set_Has_Small_Clause (Implicit_Base);
Set_Has_Non_Standard_Rep (Implicit_Base);
end if;
end Small;
------------------
-- Storage_Pool --
------------------
-- Storage_Pool attribute definition clause
when Attribute_Simple_Storage_Pool
| Attribute_Storage_Pool
=>
Storage_Pool : declare
Pool : Entity_Id;
T : Entity_Id;
begin
if Ekind (U_Ent) = E_Access_Subprogram_Type then
Error_Msg_N
("storage pool cannot be given for access-to-subprogram type",
Nam);
return;
elsif not Ekind_In (U_Ent, E_Access_Type, E_General_Access_Type)
then
Error_Msg_N
("storage pool can only be given for access types", Nam);
return;
elsif Is_Derived_Type (U_Ent) then
Error_Msg_N
("storage pool cannot be given for a derived access type",
Nam);
elsif Duplicate_Clause then
return;
elsif Present (Associated_Storage_Pool (U_Ent)) then
Error_Msg_N ("storage pool already given for &", Nam);
return;
end if;
-- Check for Storage_Size previously given
declare
SS : constant Node_Id :=
Get_Attribute_Definition_Clause
(U_Ent, Attribute_Storage_Size);
begin
if Present (SS) then
Check_Pool_Size_Clash (U_Ent, N, SS);
end if;
end;
-- Storage_Pool case
if Id = Attribute_Storage_Pool then
Analyze_And_Resolve
(Expr, Class_Wide_Type (RTE (RE_Root_Storage_Pool)));
-- In the Simple_Storage_Pool case, we allow a variable of any
-- simple storage pool type, so we Resolve without imposing an
-- expected type.
else
Analyze_And_Resolve (Expr);
if not Present (Get_Rep_Pragma
(Etype (Expr), Name_Simple_Storage_Pool_Type))
then
Error_Msg_N
("expression must be of a simple storage pool type", Expr);
end if;
end if;
if not Denotes_Variable (Expr) then
Error_Msg_N ("storage pool must be a variable", Expr);
return;
end if;
if Nkind (Expr) = N_Type_Conversion then
T := Etype (Expression (Expr));
else
T := Etype (Expr);
end if;
-- The Stack_Bounded_Pool is used internally for implementing
-- access types with a Storage_Size. Since it only work properly
-- when used on one specific type, we need to check that it is not
-- hijacked improperly:
-- type T is access Integer;
-- for T'Storage_Size use n;
-- type Q is access Float;
-- for Q'Storage_Size use T'Storage_Size; -- incorrect
if RTE_Available (RE_Stack_Bounded_Pool)
and then Base_Type (T) = RTE (RE_Stack_Bounded_Pool)
then
Error_Msg_N ("non-shareable internal Pool", Expr);
return;
end if;
-- If the argument is a name that is not an entity name, then
-- we construct a renaming operation to define an entity of
-- type storage pool.
if not Is_Entity_Name (Expr)
and then Is_Object_Reference (Expr)
then
Pool := Make_Temporary (Loc, 'P', Expr);
declare
Rnode : constant Node_Id :=
Make_Object_Renaming_Declaration (Loc,
Defining_Identifier => Pool,
Subtype_Mark =>
New_Occurrence_Of (Etype (Expr), Loc),
Name => Expr);
begin
-- If the attribute definition clause comes from an aspect
-- clause, then insert the renaming before the associated
-- entity's declaration, since the attribute clause has
-- not yet been appended to the declaration list.
if From_Aspect_Specification (N) then
Insert_Before (Parent (Entity (N)), Rnode);
else
Insert_Before (N, Rnode);
end if;
Analyze (Rnode);
Set_Associated_Storage_Pool (U_Ent, Pool);
end;
elsif Is_Entity_Name (Expr) then
Pool := Entity (Expr);
-- If pool is a renamed object, get original one. This can
-- happen with an explicit renaming, and within instances.
while Present (Renamed_Object (Pool))
and then Is_Entity_Name (Renamed_Object (Pool))
loop
Pool := Entity (Renamed_Object (Pool));
end loop;
if Present (Renamed_Object (Pool))
and then Nkind (Renamed_Object (Pool)) = N_Type_Conversion
and then Is_Entity_Name (Expression (Renamed_Object (Pool)))
then
Pool := Entity (Expression (Renamed_Object (Pool)));
end if;
Set_Associated_Storage_Pool (U_Ent, Pool);
elsif Nkind (Expr) = N_Type_Conversion
and then Is_Entity_Name (Expression (Expr))
and then Nkind (Original_Node (Expr)) = N_Attribute_Reference
then
Pool := Entity (Expression (Expr));
Set_Associated_Storage_Pool (U_Ent, Pool);
else
Error_Msg_N ("incorrect reference to a Storage Pool", Expr);
return;
end if;
end Storage_Pool;
------------------
-- Storage_Size --
------------------
-- Storage_Size attribute definition clause
when Attribute_Storage_Size => Storage_Size : declare
Btype : constant Entity_Id := Base_Type (U_Ent);
begin
if Is_Task_Type (U_Ent) then
-- Check obsolescent (but never obsolescent if from aspect)
if not From_Aspect_Specification (N) then
Check_Restriction (No_Obsolescent_Features, N);
if Warn_On_Obsolescent_Feature then
Error_Msg_N
("?j?storage size clause for task is an obsolescent "
& "feature (RM J.9)", N);
Error_Msg_N ("\?j?use Storage_Size pragma instead", N);
end if;
end if;
FOnly := True;
end if;
if not Is_Access_Type (U_Ent)
and then Ekind (U_Ent) /= E_Task_Type
then
Error_Msg_N ("storage size cannot be given for &", Nam);
elsif Is_Access_Type (U_Ent) and Is_Derived_Type (U_Ent) then
Error_Msg_N
("storage size cannot be given for a derived access type",
Nam);
elsif Duplicate_Clause then
null;
else
Analyze_And_Resolve (Expr, Any_Integer);
if Is_Access_Type (U_Ent) then
-- Check for Storage_Pool previously given
declare
SP : constant Node_Id :=
Get_Attribute_Definition_Clause
(U_Ent, Attribute_Storage_Pool);
begin
if Present (SP) then
Check_Pool_Size_Clash (U_Ent, SP, N);
end if;
end;
-- Special case of for x'Storage_Size use 0
if Is_OK_Static_Expression (Expr)
and then Expr_Value (Expr) = 0
then
Set_No_Pool_Assigned (Btype);
end if;
end if;
Set_Has_Storage_Size_Clause (Btype);
end if;
end Storage_Size;
-----------------
-- Stream_Size --
-----------------
when Attribute_Stream_Size => Stream_Size : declare
Size : constant Uint := Static_Integer (Expr);
begin
if Ada_Version <= Ada_95 then
Check_Restriction (No_Implementation_Attributes, N);
end if;
if Duplicate_Clause then
null;
elsif Is_Elementary_Type (U_Ent) then
-- The following errors are suppressed in ASIS mode to allow
-- for different ASIS back ends or ASIS-based tools to query
-- the illegal clause.
if ASIS_Mode then
null;
elsif Size /= System_Storage_Unit
and then Size /= System_Storage_Unit * 2
and then Size /= System_Storage_Unit * 4
and then Size /= System_Storage_Unit * 8
then
Error_Msg_Uint_1 := UI_From_Int (System_Storage_Unit);
Error_Msg_N
("stream size for elementary type must be a power of 2 "
& "and at least ^", N);
elsif RM_Size (U_Ent) > Size then
Error_Msg_Uint_1 := RM_Size (U_Ent);
Error_Msg_N
("stream size for elementary type must be a power of 2 "
& "and at least ^", N);
end if;
Set_Has_Stream_Size_Clause (U_Ent);
else
Error_Msg_N ("Stream_Size cannot be given for &", Nam);
end if;
end Stream_Size;
----------------
-- Value_Size --
----------------
-- Value_Size attribute definition clause
when Attribute_Value_Size => Value_Size : declare
Size : constant Uint := Static_Integer (Expr);
Biased : Boolean;
begin
if not Is_Type (U_Ent) then
Error_Msg_N ("Value_Size cannot be given for &", Nam);
elsif Duplicate_Clause then
null;
elsif Is_Array_Type (U_Ent)
and then not Is_Constrained (U_Ent)
then
Error_Msg_N
("Value_Size cannot be given for unconstrained array", Nam);
else
if Is_Elementary_Type (U_Ent) then
Check_Size (Expr, U_Ent, Size, Biased);
Set_Biased (U_Ent, N, "value size clause", Biased);
end if;
Set_RM_Size (U_Ent, Size);
end if;
end Value_Size;
-----------------------
-- Variable_Indexing --
-----------------------
when Attribute_Variable_Indexing =>
Check_Indexing_Functions;
-----------
-- Write --
-----------
when Attribute_Write =>
Analyze_Stream_TSS_Definition (TSS_Stream_Write);
Set_Has_Specified_Stream_Write (Ent);
-- All other attributes cannot be set
when others =>
Error_Msg_N
("attribute& cannot be set with definition clause", N);
end case;
-- The test for the type being frozen must be performed after any
-- expression the clause has been analyzed since the expression itself
-- might cause freezing that makes the clause illegal.
if Rep_Item_Too_Late (U_Ent, N, FOnly) then
return;
end if;
end Analyze_Attribute_Definition_Clause;
----------------------------
-- Analyze_Code_Statement --
----------------------------
procedure Analyze_Code_Statement (N : Node_Id) is
HSS : constant Node_Id := Parent (N);
SBody : constant Node_Id := Parent (HSS);
Subp : constant Entity_Id := Current_Scope;
Stmt : Node_Id;
Decl : Node_Id;
StmtO : Node_Id;
DeclO : Node_Id;
begin
-- Accept foreign code statements for CodePeer. The analysis is skipped
-- to avoid rejecting unrecognized constructs.
if CodePeer_Mode then
Set_Analyzed (N);
return;
end if;
-- Analyze and check we get right type, note that this implements the
-- requirement (RM 13.8(1)) that Machine_Code be with'ed, since that is
-- the only way that Asm_Insn could possibly be visible.
Analyze_And_Resolve (Expression (N));
if Etype (Expression (N)) = Any_Type then
return;
elsif Etype (Expression (N)) /= RTE (RE_Asm_Insn) then
Error_Msg_N ("incorrect type for code statement", N);
return;
end if;
Check_Code_Statement (N);
-- Make sure we appear in the handled statement sequence of a subprogram
-- (RM 13.8(3)).
if Nkind (HSS) /= N_Handled_Sequence_Of_Statements
or else Nkind (SBody) /= N_Subprogram_Body
then
Error_Msg_N
("code statement can only appear in body of subprogram", N);
return;
end if;
-- Do remaining checks (RM 13.8(3)) if not already done
if not Is_Machine_Code_Subprogram (Subp) then
Set_Is_Machine_Code_Subprogram (Subp);
-- No exception handlers allowed
if Present (Exception_Handlers (HSS)) then
Error_Msg_N
("exception handlers not permitted in machine code subprogram",
First (Exception_Handlers (HSS)));
end if;
-- No declarations other than use clauses and pragmas (we allow
-- certain internally generated declarations as well).
Decl := First (Declarations (SBody));
while Present (Decl) loop
DeclO := Original_Node (Decl);
if Comes_From_Source (DeclO)
and not Nkind_In (DeclO, N_Pragma,
N_Use_Package_Clause,
N_Use_Type_Clause,
N_Implicit_Label_Declaration)
then
Error_Msg_N
("this declaration not allowed in machine code subprogram",
DeclO);
end if;
Next (Decl);
end loop;
-- No statements other than code statements, pragmas, and labels.
-- Again we allow certain internally generated statements.
-- In Ada 2012, qualified expressions are names, and the code
-- statement is initially parsed as a procedure call.
Stmt := First (Statements (HSS));
while Present (Stmt) loop
StmtO := Original_Node (Stmt);
-- A procedure call transformed into a code statement is OK
if Ada_Version >= Ada_2012
and then Nkind (StmtO) = N_Procedure_Call_Statement
and then Nkind (Name (StmtO)) = N_Qualified_Expression
then
null;
elsif Comes_From_Source (StmtO)
and then not Nkind_In (StmtO, N_Pragma,
N_Label,
N_Code_Statement)
then
Error_Msg_N
("this statement is not allowed in machine code subprogram",
StmtO);
end if;
Next (Stmt);
end loop;
end if;
end Analyze_Code_Statement;
-----------------------------------------------
-- Analyze_Enumeration_Representation_Clause --
-----------------------------------------------
procedure Analyze_Enumeration_Representation_Clause (N : Node_Id) is
Ident : constant Node_Id := Identifier (N);
Aggr : constant Node_Id := Array_Aggregate (N);
Enumtype : Entity_Id;
Elit : Entity_Id;
Expr : Node_Id;
Assoc : Node_Id;
Choice : Node_Id;
Val : Uint;
Err : Boolean := False;
-- Set True to avoid cascade errors and crashes on incorrect source code
Lo : constant Uint := Expr_Value (Type_Low_Bound (Universal_Integer));
Hi : constant Uint := Expr_Value (Type_High_Bound (Universal_Integer));
-- Allowed range of universal integer (= allowed range of enum lit vals)
Min : Uint;
Max : Uint;
-- Minimum and maximum values of entries
Max_Node : Node_Id := Empty; -- init to avoid warning
-- Pointer to node for literal providing max value
begin
if Ignore_Rep_Clauses then
Kill_Rep_Clause (N);
return;
end if;
-- Ignore enumeration rep clauses by default in CodePeer mode,
-- unless -gnatd.I is specified, as a work around for potential false
-- positive messages.
if CodePeer_Mode and not Debug_Flag_Dot_II then
return;
end if;
-- First some basic error checks
Find_Type (Ident);
Enumtype := Entity (Ident);
if Enumtype = Any_Type
or else Rep_Item_Too_Early (Enumtype, N)
then
return;
else
Enumtype := Underlying_Type (Enumtype);
end if;
if not Is_Enumeration_Type (Enumtype) then
Error_Msg_NE
("enumeration type required, found}",
Ident, First_Subtype (Enumtype));
return;
end if;
-- Ignore rep clause on generic actual type. This will already have
-- been flagged on the template as an error, and this is the safest
-- way to ensure we don't get a junk cascaded message in the instance.
if Is_Generic_Actual_Type (Enumtype) then
return;
-- Type must be in current scope
elsif Scope (Enumtype) /= Current_Scope then
Error_Msg_N ("type must be declared in this scope", Ident);
return;
-- Type must be a first subtype
elsif not Is_First_Subtype (Enumtype) then
Error_Msg_N ("cannot give enumeration rep clause for subtype", N);
return;
-- Ignore duplicate rep clause
elsif Has_Enumeration_Rep_Clause (Enumtype) then
Error_Msg_N ("duplicate enumeration rep clause ignored", N);
return;
-- Don't allow rep clause for standard [wide_[wide_]]character
elsif Is_Standard_Character_Type (Enumtype) then
Error_Msg_N ("enumeration rep clause not allowed for this type", N);
return;
-- Check that the expression is a proper aggregate (no parentheses)
elsif Paren_Count (Aggr) /= 0 then
Error_Msg
("extra parentheses surrounding aggregate not allowed",
First_Sloc (Aggr));
return;
-- All tests passed, so set rep clause in place
else
Set_Has_Enumeration_Rep_Clause (Enumtype);
Set_Has_Enumeration_Rep_Clause (Base_Type (Enumtype));
end if;
-- Now we process the aggregate. Note that we don't use the normal
-- aggregate code for this purpose, because we don't want any of the
-- normal expansion activities, and a number of special semantic
-- rules apply (including the component type being any integer type)
Elit := First_Literal (Enumtype);
-- First the positional entries if any
if Present (Expressions (Aggr)) then
Expr := First (Expressions (Aggr));
while Present (Expr) loop
if No (Elit) then
Error_Msg_N ("too many entries in aggregate", Expr);
return;
end if;
Val := Static_Integer (Expr);
-- Err signals that we found some incorrect entries processing
-- the list. The final checks for completeness and ordering are
-- skipped in this case.
if Val = No_Uint then
Err := True;
elsif Val < Lo or else Hi < Val then
Error_Msg_N ("value outside permitted range", Expr);
Err := True;
end if;
Set_Enumeration_Rep (Elit, Val);
Set_Enumeration_Rep_Expr (Elit, Expr);
Next (Expr);
Next (Elit);
end loop;
end if;
-- Now process the named entries if present
if Present (Component_Associations (Aggr)) then
Assoc := First (Component_Associations (Aggr));
while Present (Assoc) loop
Choice := First (Choices (Assoc));
if Present (Next (Choice)) then
Error_Msg_N
("multiple choice not allowed here", Next (Choice));
Err := True;
end if;
if Nkind (Choice) = N_Others_Choice then
Error_Msg_N ("others choice not allowed here", Choice);
Err := True;
elsif Nkind (Choice) = N_Range then
-- ??? should allow zero/one element range here
Error_Msg_N ("range not allowed here", Choice);
Err := True;
else
Analyze_And_Resolve (Choice, Enumtype);
if Error_Posted (Choice) then
Err := True;
end if;
if not Err then
if Is_Entity_Name (Choice)
and then Is_Type (Entity (Choice))
then
Error_Msg_N ("subtype name not allowed here", Choice);
Err := True;
-- ??? should allow static subtype with zero/one entry
elsif Etype (Choice) = Base_Type (Enumtype) then
if not Is_OK_Static_Expression (Choice) then
Flag_Non_Static_Expr
("non-static expression used for choice!", Choice);
Err := True;
else
Elit := Expr_Value_E (Choice);
if Present (Enumeration_Rep_Expr (Elit)) then
Error_Msg_Sloc :=
Sloc (Enumeration_Rep_Expr (Elit));
Error_Msg_NE
("representation for& previously given#",
Choice, Elit);
Err := True;
end if;
Set_Enumeration_Rep_Expr (Elit, Expression (Assoc));
Expr := Expression (Assoc);
Val := Static_Integer (Expr);
if Val = No_Uint then
Err := True;
elsif Val < Lo or else Hi < Val then
Error_Msg_N ("value outside permitted range", Expr);
Err := True;
end if;
Set_Enumeration_Rep (Elit, Val);
end if;
end if;
end if;
end if;
Next (Assoc);
end loop;
end if;
-- Aggregate is fully processed. Now we check that a full set of
-- representations was given, and that they are in range and in order.
-- These checks are only done if no other errors occurred.
if not Err then
Min := No_Uint;
Max := No_Uint;
Elit := First_Literal (Enumtype);
while Present (Elit) loop
if No (Enumeration_Rep_Expr (Elit)) then
Error_Msg_NE ("missing representation for&!", N, Elit);
else
Val := Enumeration_Rep (Elit);
if Min = No_Uint then
Min := Val;
end if;
if Val /= No_Uint then
if Max /= No_Uint and then Val <= Max then
Error_Msg_NE
("enumeration value for& not ordered!",
Enumeration_Rep_Expr (Elit), Elit);
end if;
Max_Node := Enumeration_Rep_Expr (Elit);
Max := Val;
end if;
-- If there is at least one literal whose representation is not
-- equal to the Pos value, then note that this enumeration type
-- has a non-standard representation.
if Val /= Enumeration_Pos (Elit) then
Set_Has_Non_Standard_Rep (Base_Type (Enumtype));
end if;
end if;
Next (Elit);
end loop;
-- Now set proper size information
declare
Minsize : Uint := UI_From_Int (Minimum_Size (Enumtype));
begin
if Has_Size_Clause (Enumtype) then
-- All OK, if size is OK now
if RM_Size (Enumtype) >= Minsize then
null;
else
-- Try if we can get by with biasing
Minsize :=
UI_From_Int (Minimum_Size (Enumtype, Biased => True));
-- Error message if even biasing does not work
if RM_Size (Enumtype) < Minsize then
Error_Msg_Uint_1 := RM_Size (Enumtype);
Error_Msg_Uint_2 := Max;
Error_Msg_N
("previously given size (^) is too small "
& "for this value (^)", Max_Node);
-- If biasing worked, indicate that we now have biased rep
else
Set_Biased
(Enumtype, Size_Clause (Enumtype), "size clause");
end if;
end if;
else
Set_RM_Size (Enumtype, Minsize);
Set_Enum_Esize (Enumtype);
end if;
Set_RM_Size (Base_Type (Enumtype), RM_Size (Enumtype));
Set_Esize (Base_Type (Enumtype), Esize (Enumtype));
Set_Alignment (Base_Type (Enumtype), Alignment (Enumtype));
end;
end if;
-- We repeat the too late test in case it froze itself
if Rep_Item_Too_Late (Enumtype, N) then
null;
end if;
end Analyze_Enumeration_Representation_Clause;
----------------------------
-- Analyze_Free_Statement --
----------------------------
procedure Analyze_Free_Statement (N : Node_Id) is
begin
Analyze (Expression (N));
end Analyze_Free_Statement;
---------------------------
-- Analyze_Freeze_Entity --
---------------------------
procedure Analyze_Freeze_Entity (N : Node_Id) is
begin
Freeze_Entity_Checks (N);
end Analyze_Freeze_Entity;
-----------------------------------
-- Analyze_Freeze_Generic_Entity --
-----------------------------------
procedure Analyze_Freeze_Generic_Entity (N : Node_Id) is
E : constant Entity_Id := Entity (N);
begin
if not Is_Frozen (E) and then Has_Delayed_Aspects (E) then
Analyze_Aspects_At_Freeze_Point (E);
end if;
Freeze_Entity_Checks (N);
end Analyze_Freeze_Generic_Entity;
------------------------------------------
-- Analyze_Record_Representation_Clause --
------------------------------------------
-- Note: we check as much as we can here, but we can't do any checks
-- based on the position values (e.g. overlap checks) until freeze time
-- because especially in Ada 2005 (machine scalar mode), the processing
-- for non-standard bit order can substantially change the positions.
-- See procedure Check_Record_Representation_Clause (called from Freeze)
-- for the remainder of this processing.
procedure Analyze_Record_Representation_Clause (N : Node_Id) is
Ident : constant Node_Id := Identifier (N);
Biased : Boolean;
CC : Node_Id;
Comp : Entity_Id;
Fbit : Uint;
Hbit : Uint := Uint_0;
Lbit : Uint;
Ocomp : Entity_Id;
Posit : Uint;
Rectype : Entity_Id;
Recdef : Node_Id;
function Is_Inherited (Comp : Entity_Id) return Boolean;
-- True if Comp is an inherited component in a record extension
------------------
-- Is_Inherited --
------------------
function Is_Inherited (Comp : Entity_Id) return Boolean is
Comp_Base : Entity_Id;
begin
if Ekind (Rectype) = E_Record_Subtype then
Comp_Base := Original_Record_Component (Comp);
else
Comp_Base := Comp;
end if;
return Comp_Base /= Original_Record_Component (Comp_Base);
end Is_Inherited;
-- Local variables
Is_Record_Extension : Boolean;
-- True if Rectype is a record extension
CR_Pragma : Node_Id := Empty;
-- Points to N_Pragma node if Complete_Representation pragma present
-- Start of processing for Analyze_Record_Representation_Clause
begin
if Ignore_Rep_Clauses then
Kill_Rep_Clause (N);
return;
end if;
Find_Type (Ident);
Rectype := Entity (Ident);
if Rectype = Any_Type or else Rep_Item_Too_Early (Rectype, N) then
return;
else
Rectype := Underlying_Type (Rectype);
end if;
-- First some basic error checks
if not Is_Record_Type (Rectype) then
Error_Msg_NE
("record type required, found}", Ident, First_Subtype (Rectype));
return;
elsif Scope (Rectype) /= Current_Scope then
Error_Msg_N ("type must be declared in this scope", N);
return;
elsif not Is_First_Subtype (Rectype) then
Error_Msg_N ("cannot give record rep clause for subtype", N);
return;
elsif Has_Record_Rep_Clause (Rectype) then
Error_Msg_N ("duplicate record rep clause ignored", N);
return;
elsif Rep_Item_Too_Late (Rectype, N) then
return;
end if;
-- We know we have a first subtype, now possibly go to the anonymous
-- base type to determine whether Rectype is a record extension.
Recdef := Type_Definition (Declaration_Node (Base_Type (Rectype)));
Is_Record_Extension :=
Nkind (Recdef) = N_Derived_Type_Definition
and then Present (Record_Extension_Part (Recdef));
if Present (Mod_Clause (N)) then
declare
Loc : constant Source_Ptr := Sloc (N);
M : constant Node_Id := Mod_Clause (N);
P : constant List_Id := Pragmas_Before (M);
AtM_Nod : Node_Id;
Mod_Val : Uint;
pragma Warnings (Off, Mod_Val);
begin
Check_Restriction (No_Obsolescent_Features, Mod_Clause (N));
if Warn_On_Obsolescent_Feature then
Error_Msg_N
("?j?mod clause is an obsolescent feature (RM J.8)", N);
Error_Msg_N
("\?j?use alignment attribute definition clause instead", N);
end if;
if Present (P) then
Analyze_List (P);
end if;
-- In ASIS_Mode mode, expansion is disabled, but we must convert
-- the Mod clause into an alignment clause anyway, so that the
-- back end can compute and back-annotate properly the size and
-- alignment of types that may include this record.
-- This seems dubious, this destroys the source tree in a manner
-- not detectable by ASIS ???
if Operating_Mode = Check_Semantics and then ASIS_Mode then
AtM_Nod :=
Make_Attribute_Definition_Clause (Loc,
Name => New_Occurrence_Of (Base_Type (Rectype), Loc),
Chars => Name_Alignment,
Expression => Relocate_Node (Expression (M)));
Set_From_At_Mod (AtM_Nod);
Insert_After (N, AtM_Nod);
Mod_Val := Get_Alignment_Value (Expression (AtM_Nod));
Set_Mod_Clause (N, Empty);
else
-- Get the alignment value to perform error checking
Mod_Val := Get_Alignment_Value (Expression (M));
end if;
end;
end if;
-- For untagged types, clear any existing component clauses for the
-- type. If the type is derived, this is what allows us to override
-- a rep clause for the parent. For type extensions, the representation
-- of the inherited components is inherited, so we want to keep previous
-- component clauses for completeness.
if not Is_Tagged_Type (Rectype) then
Comp := First_Component_Or_Discriminant (Rectype);
while Present (Comp) loop
Set_Component_Clause (Comp, Empty);
Next_Component_Or_Discriminant (Comp);
end loop;
end if;
-- All done if no component clauses
CC := First (Component_Clauses (N));
if No (CC) then
return;
end if;
-- A representation like this applies to the base type
Set_Has_Record_Rep_Clause (Base_Type (Rectype));
Set_Has_Non_Standard_Rep (Base_Type (Rectype));
Set_Has_Specified_Layout (Base_Type (Rectype));
-- Process the component clauses
while Present (CC) loop
-- Pragma
if Nkind (CC) = N_Pragma then
Analyze (CC);
-- The only pragma of interest is Complete_Representation
if Pragma_Name (CC) = Name_Complete_Representation then
CR_Pragma := CC;
end if;
-- Processing for real component clause
else
Posit := Static_Integer (Position (CC));
Fbit := Static_Integer (First_Bit (CC));
Lbit := Static_Integer (Last_Bit (CC));
if Posit /= No_Uint
and then Fbit /= No_Uint
and then Lbit /= No_Uint
then
if Posit < 0 then
Error_Msg_N ("position cannot be negative", Position (CC));
elsif Fbit < 0 then
Error_Msg_N ("first bit cannot be negative", First_Bit (CC));
-- The Last_Bit specified in a component clause must not be
-- less than the First_Bit minus one (RM-13.5.1(10)).
elsif Lbit < Fbit - 1 then
Error_Msg_N
("last bit cannot be less than first bit minus one",
Last_Bit (CC));
-- Values look OK, so find the corresponding record component
-- Even though the syntax allows an attribute reference for
-- implementation-defined components, GNAT does not allow the
-- tag to get an explicit position.
elsif Nkind (Component_Name (CC)) = N_Attribute_Reference then
if Attribute_Name (Component_Name (CC)) = Name_Tag then
Error_Msg_N ("position of tag cannot be specified", CC);
else
Error_Msg_N ("illegal component name", CC);
end if;
else
Comp := First_Entity (Rectype);
while Present (Comp) loop
exit when Chars (Comp) = Chars (Component_Name (CC));
Next_Entity (Comp);
end loop;
if No (Comp) then
-- Maybe component of base type that is absent from
-- statically constrained first subtype.
Comp := First_Entity (Base_Type (Rectype));
while Present (Comp) loop
exit when Chars (Comp) = Chars (Component_Name (CC));
Next_Entity (Comp);
end loop;
end if;
if No (Comp) then
Error_Msg_N
("component clause is for non-existent field", CC);
-- Ada 2012 (AI05-0026): Any name that denotes a
-- discriminant of an object of an unchecked union type
-- shall not occur within a record_representation_clause.
-- The general restriction of using record rep clauses on
-- Unchecked_Union types has now been lifted. Since it is
-- possible to introduce a record rep clause which mentions
-- the discriminant of an Unchecked_Union in non-Ada 2012
-- code, this check is applied to all versions of the
-- language.
elsif Ekind (Comp) = E_Discriminant
and then Is_Unchecked_Union (Rectype)
then
Error_Msg_N
("cannot reference discriminant of unchecked union",
Component_Name (CC));
elsif Is_Record_Extension and then Is_Inherited (Comp) then
Error_Msg_NE
("component clause not allowed for inherited "
& "component&", CC, Comp);
elsif Present (Component_Clause (Comp)) then
-- Diagnose duplicate rep clause, or check consistency
-- if this is an inherited component. In a double fault,
-- there may be a duplicate inconsistent clause for an
-- inherited component.
if Scope (Original_Record_Component (Comp)) = Rectype
or else Parent (Component_Clause (Comp)) = N
then
Error_Msg_Sloc := Sloc (Component_Clause (Comp));
Error_Msg_N ("component clause previously given#", CC);
else
declare
Rep1 : constant Node_Id := Component_Clause (Comp);
begin
if Intval (Position (Rep1)) /=
Intval (Position (CC))
or else Intval (First_Bit (Rep1)) /=
Intval (First_Bit (CC))
or else Intval (Last_Bit (Rep1)) /=
Intval (Last_Bit (CC))
then
Error_Msg_N
("component clause inconsistent with "
& "representation of ancestor", CC);
elsif Warn_On_Redundant_Constructs then
Error_Msg_N
("?r?redundant confirming component clause "
& "for component!", CC);
end if;
end;
end if;
-- Normal case where this is the first component clause we
-- have seen for this entity, so set it up properly.
else
-- Make reference for field in record rep clause and set
-- appropriate entity field in the field identifier.
Generate_Reference
(Comp, Component_Name (CC), Set_Ref => False);
Set_Entity (Component_Name (CC), Comp);
-- Update Fbit and Lbit to the actual bit number
Fbit := Fbit + UI_From_Int (SSU) * Posit;
Lbit := Lbit + UI_From_Int (SSU) * Posit;
if Has_Size_Clause (Rectype)
and then RM_Size (Rectype) <= Lbit
then
Error_Msg_N
("bit number out of range of specified size",
Last_Bit (CC));
else
Set_Component_Clause (Comp, CC);
Set_Component_Bit_Offset (Comp, Fbit);
Set_Esize (Comp, 1 + (Lbit - Fbit));
Set_Normalized_First_Bit (Comp, Fbit mod SSU);
Set_Normalized_Position (Comp, Fbit / SSU);
if Warn_On_Overridden_Size
and then Has_Size_Clause (Etype (Comp))
and then RM_Size (Etype (Comp)) /= Esize (Comp)
then
Error_Msg_NE
("?S?component size overrides size clause for&",
Component_Name (CC), Etype (Comp));
end if;
-- This information is also set in the corresponding
-- component of the base type, found by accessing the
-- Original_Record_Component link if it is present.
Ocomp := Original_Record_Component (Comp);
if Hbit < Lbit then
Hbit := Lbit;
end if;
Check_Size
(Component_Name (CC),
Etype (Comp),
Esize (Comp),
Biased);
Set_Biased
(Comp, First_Node (CC), "component clause", Biased);
if Present (Ocomp) then
Set_Component_Clause (Ocomp, CC);
Set_Component_Bit_Offset (Ocomp, Fbit);
Set_Normalized_First_Bit (Ocomp, Fbit mod SSU);
Set_Normalized_Position (Ocomp, Fbit / SSU);
Set_Esize (Ocomp, 1 + (Lbit - Fbit));
Set_Normalized_Position_Max
(Ocomp, Normalized_Position (Ocomp));
-- Note: we don't use Set_Biased here, because we
-- already gave a warning above if needed, and we
-- would get a duplicate for the same name here.
Set_Has_Biased_Representation
(Ocomp, Has_Biased_Representation (Comp));
end if;
if Esize (Comp) < 0 then
Error_Msg_N ("component size is negative", CC);
end if;
end if;
end if;
end if;
end if;
end if;
Next (CC);
end loop;
-- Check missing components if Complete_Representation pragma appeared
if Present (CR_Pragma) then
Comp := First_Component_Or_Discriminant (Rectype);
while Present (Comp) loop
if No (Component_Clause (Comp)) then
Error_Msg_NE
("missing component clause for &", CR_Pragma, Comp);
end if;
Next_Component_Or_Discriminant (Comp);
end loop;
-- Give missing components warning if required
elsif Warn_On_Unrepped_Components then
declare
Num_Repped_Components : Nat := 0;
Num_Unrepped_Components : Nat := 0;
begin
-- First count number of repped and unrepped components
Comp := First_Component_Or_Discriminant (Rectype);
while Present (Comp) loop
if Present (Component_Clause (Comp)) then
Num_Repped_Components := Num_Repped_Components + 1;
else
Num_Unrepped_Components := Num_Unrepped_Components + 1;
end if;
Next_Component_Or_Discriminant (Comp);
end loop;
-- We are only interested in the case where there is at least one
-- unrepped component, and at least half the components have rep
-- clauses. We figure that if less than half have them, then the
-- partial rep clause is really intentional. If the component
-- type has no underlying type set at this point (as for a generic
-- formal type), we don't know enough to give a warning on the
-- component.
if Num_Unrepped_Components > 0
and then Num_Unrepped_Components < Num_Repped_Components
then
Comp := First_Component_Or_Discriminant (Rectype);
while Present (Comp) loop
if No (Component_Clause (Comp))
and then Comes_From_Source (Comp)
and then Present (Underlying_Type (Etype (Comp)))
and then (Is_Scalar_Type (Underlying_Type (Etype (Comp)))
or else Size_Known_At_Compile_Time
(Underlying_Type (Etype (Comp))))
and then not Has_Warnings_Off (Rectype)
-- Ignore discriminant in unchecked union, since it is
-- not there, and cannot have a component clause.
and then (not Is_Unchecked_Union (Rectype)
or else Ekind (Comp) /= E_Discriminant)
then
Error_Msg_Sloc := Sloc (Comp);
Error_Msg_NE
("?C?no component clause given for & declared #",
N, Comp);
end if;
Next_Component_Or_Discriminant (Comp);
end loop;
end if;
end;
end if;
end Analyze_Record_Representation_Clause;
-------------------------------------
-- Build_Discrete_Static_Predicate --
-------------------------------------
procedure Build_Discrete_Static_Predicate
(Typ : Entity_Id;
Expr : Node_Id;
Nam : Name_Id)
is
Loc : constant Source_Ptr := Sloc (Expr);
Non_Static : exception;
-- Raised if something non-static is found
Btyp : constant Entity_Id := Base_Type (Typ);
BLo : constant Uint := Expr_Value (Type_Low_Bound (Btyp));
BHi : constant Uint := Expr_Value (Type_High_Bound (Btyp));
-- Low bound and high bound value of base type of Typ
TLo : Uint;
THi : Uint;
-- Bounds for constructing the static predicate. We use the bound of the
-- subtype if it is static, otherwise the corresponding base type bound.
-- Note: a non-static subtype can have a static predicate.
type REnt is record
Lo, Hi : Uint;
end record;
-- One entry in a Rlist value, a single REnt (range entry) value denotes
-- one range from Lo to Hi. To represent a single value range Lo = Hi =
-- value.
type RList is array (Nat range <>) of REnt;
-- A list of ranges. The ranges are sorted in increasing order, and are
-- disjoint (there is a gap of at least one value between each range in
-- the table). A value is in the set of ranges in Rlist if it lies
-- within one of these ranges.
False_Range : constant RList :=
RList'(1 .. 0 => REnt'(No_Uint, No_Uint));
-- An empty set of ranges represents a range list that can never be
-- satisfied, since there are no ranges in which the value could lie,
-- so it does not lie in any of them. False_Range is a canonical value
-- for this empty set, but general processing should test for an Rlist
-- with length zero (see Is_False predicate), since other null ranges
-- may appear which must be treated as False.
True_Range : constant RList := RList'(1 => REnt'(BLo, BHi));
-- Range representing True, value must be in the base range
function "and" (Left : RList; Right : RList) return RList;
-- And's together two range lists, returning a range list. This is a set
-- intersection operation.
function "or" (Left : RList; Right : RList) return RList;
-- Or's together two range lists, returning a range list. This is a set
-- union operation.
function "not" (Right : RList) return RList;
-- Returns complement of a given range list, i.e. a range list
-- representing all the values in TLo .. THi that are not in the input
-- operand Right.
function Build_Val (V : Uint) return Node_Id;
-- Return an analyzed N_Identifier node referencing this value, suitable
-- for use as an entry in the Static_Discrte_Predicate list. This node
-- is typed with the base type.
function Build_Range (Lo : Uint; Hi : Uint) return Node_Id;
-- Return an analyzed N_Range node referencing this range, suitable for
-- use as an entry in the Static_Discrete_Predicate list. This node is
-- typed with the base type.
function Get_RList (Exp : Node_Id) return RList;
-- This is a recursive routine that converts the given expression into a
-- list of ranges, suitable for use in building the static predicate.
function Is_False (R : RList) return Boolean;
pragma Inline (Is_False);
-- Returns True if the given range list is empty, and thus represents a
-- False list of ranges that can never be satisfied.
function Is_True (R : RList) return Boolean;
-- Returns True if R trivially represents the True predicate by having a
-- single range from BLo to BHi.
function Is_Type_Ref (N : Node_Id) return Boolean;
pragma Inline (Is_Type_Ref);
-- Returns if True if N is a reference to the type for the predicate in
-- the expression (i.e. if it is an identifier whose Chars field matches
-- the Nam given in the call). N must not be parenthesized, if the type
-- name appears in parens, this routine will return False.
function Lo_Val (N : Node_Id) return Uint;
-- Given an entry from a Static_Discrete_Predicate list that is either
-- a static expression or static range, gets either the expression value
-- or the low bound of the range.
function Hi_Val (N : Node_Id) return Uint;
-- Given an entry from a Static_Discrete_Predicate list that is either
-- a static expression or static range, gets either the expression value
-- or the high bound of the range.
function Membership_Entry (N : Node_Id) return RList;
-- Given a single membership entry (range, value, or subtype), returns
-- the corresponding range list. Raises Static_Error if not static.
function Membership_Entries (N : Node_Id) return RList;
-- Given an element on an alternatives list of a membership operation,
-- returns the range list corresponding to this entry and all following
-- entries (i.e. returns the "or" of this list of values).
function Stat_Pred (Typ : Entity_Id) return RList;
-- Given a type, if it has a static predicate, then return the predicate
-- as a range list, otherwise raise Non_Static.
-----------
-- "and" --
-----------
function "and" (Left : RList; Right : RList) return RList is
FEnt : REnt;
-- First range of result
SLeft : Nat := Left'First;
-- Start of rest of left entries
SRight : Nat := Right'First;
-- Start of rest of right entries
begin
-- If either range is True, return the other
if Is_True (Left) then
return Right;
elsif Is_True (Right) then
return Left;
end if;
-- If either range is False, return False
if Is_False (Left) or else Is_False (Right) then
return False_Range;
end if;
-- Loop to remove entries at start that are disjoint, and thus just
-- get discarded from the result entirely.
loop
-- If no operands left in either operand, result is false
if SLeft > Left'Last or else SRight > Right'Last then
return False_Range;
-- Discard first left operand entry if disjoint with right
elsif Left (SLeft).Hi < Right (SRight).Lo then
SLeft := SLeft + 1;
-- Discard first right operand entry if disjoint with left
elsif Right (SRight).Hi < Left (SLeft).Lo then
SRight := SRight + 1;
-- Otherwise we have an overlapping entry
else
exit;
end if;
end loop;
-- Now we have two non-null operands, and first entries overlap. The
-- first entry in the result will be the overlapping part of these
-- two entries.
FEnt := REnt'(Lo => UI_Max (Left (SLeft).Lo, Right (SRight).Lo),
Hi => UI_Min (Left (SLeft).Hi, Right (SRight).Hi));
-- Now we can remove the entry that ended at a lower value, since its
-- contribution is entirely contained in Fent.
if Left (SLeft).Hi <= Right (SRight).Hi then
SLeft := SLeft + 1;
else
SRight := SRight + 1;
end if;
-- Compute result by concatenating this first entry with the "and" of
-- the remaining parts of the left and right operands. Note that if
-- either of these is empty, "and" will yield empty, so that we will
-- end up with just Fent, which is what we want in that case.
return
FEnt & (Left (SLeft .. Left'Last) and Right (SRight .. Right'Last));
end "and";
-----------
-- "not" --
-----------
function "not" (Right : RList) return RList is
begin
-- Return True if False range
if Is_False (Right) then
return True_Range;
end if;
-- Return False if True range
if Is_True (Right) then
return False_Range;
end if;
-- Here if not trivial case
declare
Result : RList (1 .. Right'Length + 1);
-- May need one more entry for gap at beginning and end
Count : Nat := 0;
-- Number of entries stored in Result
begin
-- Gap at start
if Right (Right'First).Lo > TLo then
Count := Count + 1;
Result (Count) := REnt'(TLo, Right (Right'First).Lo - 1);
end if;
-- Gaps between ranges
for J in Right'First .. Right'Last - 1 loop
Count := Count + 1;
Result (Count) := REnt'(Right (J).Hi + 1, Right (J + 1).Lo - 1);
end loop;
-- Gap at end
if Right (Right'Last).Hi < THi then
Count := Count + 1;
Result (Count) := REnt'(Right (Right'Last).Hi + 1, THi);
end if;
return Result (1 .. Count);
end;
end "not";
----------
-- "or" --
----------
function "or" (Left : RList; Right : RList) return RList is
FEnt : REnt;
-- First range of result
SLeft : Nat := Left'First;
-- Start of rest of left entries
SRight : Nat := Right'First;
-- Start of rest of right entries
begin
-- If either range is True, return True
if Is_True (Left) or else Is_True (Right) then
return True_Range;
end if;
-- If either range is False (empty), return the other
if Is_False (Left) then
return Right;
elsif Is_False (Right) then
return Left;
end if;
-- Initialize result first entry from left or right operand depending
-- on which starts with the lower range.
if Left (SLeft).Lo < Right (SRight).Lo then
FEnt := Left (SLeft);
SLeft := SLeft + 1;
else
FEnt := Right (SRight);
SRight := SRight + 1;
end if;
-- This loop eats ranges from left and right operands that are
-- contiguous with the first range we are gathering.
loop
-- Eat first entry in left operand if contiguous or overlapped by
-- gathered first operand of result.
if SLeft <= Left'Last
and then Left (SLeft).Lo <= FEnt.Hi + 1
then
FEnt.Hi := UI_Max (FEnt.Hi, Left (SLeft).Hi);
SLeft := SLeft + 1;
-- Eat first entry in right operand if contiguous or overlapped by
-- gathered right operand of result.
elsif SRight <= Right'Last
and then Right (SRight).Lo <= FEnt.Hi + 1
then
FEnt.Hi := UI_Max (FEnt.Hi, Right (SRight).Hi);
SRight := SRight + 1;
-- All done if no more entries to eat
else
exit;
end if;
end loop;
-- Obtain result as the first entry we just computed, concatenated
-- to the "or" of the remaining results (if one operand is empty,
-- this will just concatenate with the other
return
FEnt & (Left (SLeft .. Left'Last) or Right (SRight .. Right'Last));
end "or";
-----------------
-- Build_Range --
-----------------
function Build_Range (Lo : Uint; Hi : Uint) return Node_Id is
Result : Node_Id;
begin
Result :=
Make_Range (Loc,
Low_Bound => Build_Val (Lo),
High_Bound => Build_Val (Hi));
Set_Etype (Result, Btyp);
Set_Analyzed (Result);
return Result;
end Build_Range;
---------------
-- Build_Val --
---------------
function Build_Val (V : Uint) return Node_Id is
Result : Node_Id;
begin
if Is_Enumeration_Type (Typ) then
Result := Get_Enum_Lit_From_Pos (Typ, V, Loc);
else
Result := Make_Integer_Literal (Loc, V);
end if;
Set_Etype (Result, Btyp);
Set_Is_Static_Expression (Result);
Set_Analyzed (Result);
return Result;
end Build_Val;
---------------
-- Get_RList --
---------------
function Get_RList (Exp : Node_Id) return RList is
Op : Node_Kind;
Val : Uint;
begin
-- Static expression can only be true or false
if Is_OK_Static_Expression (Exp) then
if Expr_Value (Exp) = 0 then
return False_Range;
else
return True_Range;
end if;
end if;
-- Otherwise test node type
Op := Nkind (Exp);
case Op is
-- And
when N_And_Then
| N_Op_And
=>
return Get_RList (Left_Opnd (Exp))
and
Get_RList (Right_Opnd (Exp));
-- Or
when N_Op_Or
| N_Or_Else
=>
return Get_RList (Left_Opnd (Exp))
or
Get_RList (Right_Opnd (Exp));
-- Not
when N_Op_Not =>
return not Get_RList (Right_Opnd (Exp));
-- Comparisons of type with static value
when N_Op_Compare =>
-- Type is left operand
if Is_Type_Ref (Left_Opnd (Exp))
and then Is_OK_Static_Expression (Right_Opnd (Exp))
then
Val := Expr_Value (Right_Opnd (Exp));
-- Typ is right operand
elsif Is_Type_Ref (Right_Opnd (Exp))
and then Is_OK_Static_Expression (Left_Opnd (Exp))
then
Val := Expr_Value (Left_Opnd (Exp));
-- Invert sense of comparison
case Op is
when N_Op_Gt => Op := N_Op_Lt;
when N_Op_Lt => Op := N_Op_Gt;
when N_Op_Ge => Op := N_Op_Le;
when N_Op_Le => Op := N_Op_Ge;
when others => null;
end case;
-- Other cases are non-static
else
raise Non_Static;
end if;
-- Construct range according to comparison operation
case Op is
when N_Op_Eq =>
return RList'(1 => REnt'(Val, Val));
when N_Op_Ge =>
return RList'(1 => REnt'(Val, BHi));
when N_Op_Gt =>
return RList'(1 => REnt'(Val + 1, BHi));
when N_Op_Le =>
return RList'(1 => REnt'(BLo, Val));
when N_Op_Lt =>
return RList'(1 => REnt'(BLo, Val - 1));
when N_Op_Ne =>
return RList'(REnt'(BLo, Val - 1), REnt'(Val + 1, BHi));
when others =>
raise Program_Error;
end case;
-- Membership (IN)
when N_In =>
if not Is_Type_Ref (Left_Opnd (Exp)) then
raise Non_Static;
end if;
if Present (Right_Opnd (Exp)) then
return Membership_Entry (Right_Opnd (Exp));
else
return Membership_Entries (First (Alternatives (Exp)));
end if;
-- Negative membership (NOT IN)
when N_Not_In =>
if not Is_Type_Ref (Left_Opnd (Exp)) then
raise Non_Static;
end if;
if Present (Right_Opnd (Exp)) then
return not Membership_Entry (Right_Opnd (Exp));
else
return not Membership_Entries (First (Alternatives (Exp)));
end if;
-- Function call, may be call to static predicate
when N_Function_Call =>
if Is_Entity_Name (Name (Exp)) then
declare
Ent : constant Entity_Id := Entity (Name (Exp));
begin
if Is_Predicate_Function (Ent)
or else
Is_Predicate_Function_M (Ent)
then
return Stat_Pred (Etype (First_Formal (Ent)));
end if;
end;
end if;
-- Other function call cases are non-static
raise Non_Static;
-- Qualified expression, dig out the expression
when N_Qualified_Expression =>
return Get_RList (Expression (Exp));
when N_Case_Expression =>
declare
Alt : Node_Id;
Choices : List_Id;
Dep : Node_Id;
begin
if not Is_Entity_Name (Expression (Expr))
or else Etype (Expression (Expr)) /= Typ
then
Error_Msg_N
("expression must denaote subtype", Expression (Expr));
return False_Range;
end if;
-- Collect discrete choices in all True alternatives
Choices := New_List;
Alt := First (Alternatives (Exp));
while Present (Alt) loop
Dep := Expression (Alt);
if not Is_OK_Static_Expression (Dep) then
raise Non_Static;
elsif Is_True (Expr_Value (Dep)) then
Append_List_To (Choices,
New_Copy_List (Discrete_Choices (Alt)));
end if;
Next (Alt);
end loop;
return Membership_Entries (First (Choices));
end;
-- Expression with actions: if no actions, dig out expression
when N_Expression_With_Actions =>
if Is_Empty_List (Actions (Exp)) then
return Get_RList (Expression (Exp));
else
raise Non_Static;
end if;
-- Xor operator
when N_Op_Xor =>
return (Get_RList (Left_Opnd (Exp))
and not Get_RList (Right_Opnd (Exp)))
or (Get_RList (Right_Opnd (Exp))
and not Get_RList (Left_Opnd (Exp)));
-- Any other node type is non-static
when others =>
raise Non_Static;
end case;
end Get_RList;
------------
-- Hi_Val --
------------
function Hi_Val (N : Node_Id) return Uint is
begin
if Is_OK_Static_Expression (N) then
return Expr_Value (N);
else
pragma Assert (Nkind (N) = N_Range);
return Expr_Value (High_Bound (N));
end if;
end Hi_Val;
--------------
-- Is_False --
--------------
function Is_False (R : RList) return Boolean is
begin
return R'Length = 0;
end Is_False;
-------------
-- Is_True --
-------------
function Is_True (R : RList) return Boolean is
begin
return R'Length = 1
and then R (R'First).Lo = BLo
and then R (R'First).Hi = BHi;
end Is_True;
-----------------
-- Is_Type_Ref --
-----------------
function Is_Type_Ref (N : Node_Id) return Boolean is
begin
return Nkind (N) = N_Identifier
and then Chars (N) = Nam
and then Paren_Count (N) = 0;
end Is_Type_Ref;
------------
-- Lo_Val --
------------
function Lo_Val (N : Node_Id) return Uint is
begin
if Is_OK_Static_Expression (N) then
return Expr_Value (N);
else
pragma Assert (Nkind (N) = N_Range);
return Expr_Value (Low_Bound (N));
end if;
end Lo_Val;
------------------------
-- Membership_Entries --
------------------------
function Membership_Entries (N : Node_Id) return RList is
begin
if No (Next (N)) then
return Membership_Entry (N);
else
return Membership_Entry (N) or Membership_Entries (Next (N));
end if;
end Membership_Entries;
----------------------
-- Membership_Entry --
----------------------
function Membership_Entry (N : Node_Id) return RList is
Val : Uint;
SLo : Uint;
SHi : Uint;
begin
-- Range case
if Nkind (N) = N_Range then
if not Is_OK_Static_Expression (Low_Bound (N))
or else
not Is_OK_Static_Expression (High_Bound (N))
then
raise Non_Static;
else
SLo := Expr_Value (Low_Bound (N));
SHi := Expr_Value (High_Bound (N));
return RList'(1 => REnt'(SLo, SHi));
end if;
-- Static expression case
elsif Is_OK_Static_Expression (N) then
Val := Expr_Value (N);
return RList'(1 => REnt'(Val, Val));
-- Identifier (other than static expression) case
else pragma Assert (Nkind (N) = N_Identifier);
-- Type case
if Is_Type (Entity (N)) then
-- If type has predicates, process them
if Has_Predicates (Entity (N)) then
return Stat_Pred (Entity (N));
-- For static subtype without predicates, get range
elsif Is_OK_Static_Subtype (Entity (N)) then
SLo := Expr_Value (Type_Low_Bound (Entity (N)));
SHi := Expr_Value (Type_High_Bound (Entity (N)));
return RList'(1 => REnt'(SLo, SHi));
-- Any other type makes us non-static
else
raise Non_Static;
end if;
-- Any other kind of identifier in predicate (e.g. a non-static
-- expression value) means this is not a static predicate.
else
raise Non_Static;
end if;
end if;
end Membership_Entry;
---------------
-- Stat_Pred --
---------------
function Stat_Pred (Typ : Entity_Id) return RList is
begin
-- Not static if type does not have static predicates
if not Has_Static_Predicate (Typ) then
raise Non_Static;
end if;
-- Otherwise we convert the predicate list to a range list
declare
Spred : constant List_Id := Static_Discrete_Predicate (Typ);
Result : RList (1 .. List_Length (Spred));
P : Node_Id;
begin
P := First (Static_Discrete_Predicate (Typ));
for J in Result'Range loop
Result (J) := REnt'(Lo_Val (P), Hi_Val (P));
Next (P);
end loop;
return Result;
end;
end Stat_Pred;
-- Start of processing for Build_Discrete_Static_Predicate
begin
-- Establish bounds for the predicate
if Compile_Time_Known_Value (Type_Low_Bound (Typ)) then
TLo := Expr_Value (Type_Low_Bound (Typ));
else
TLo := BLo;
end if;
if Compile_Time_Known_Value (Type_High_Bound (Typ)) then
THi := Expr_Value (Type_High_Bound (Typ));
else
THi := BHi;
end if;
-- Analyze the expression to see if it is a static predicate
declare
Ranges : constant RList := Get_RList (Expr);
-- Range list from expression if it is static
Plist : List_Id;
begin
-- Convert range list into a form for the static predicate. In the
-- Ranges array, we just have raw ranges, these must be converted
-- to properly typed and analyzed static expressions or range nodes.
-- Note: here we limit ranges to the ranges of the subtype, so that
-- a predicate is always false for values outside the subtype. That
-- seems fine, such values are invalid anyway, and considering them
-- to fail the predicate seems allowed and friendly, and furthermore
-- simplifies processing for case statements and loops.
Plist := New_List;
for J in Ranges'Range loop
declare
Lo : Uint := Ranges (J).Lo;
Hi : Uint := Ranges (J).Hi;
begin
-- Ignore completely out of range entry
if Hi < TLo or else Lo > THi then
null;
-- Otherwise process entry
else
-- Adjust out of range value to subtype range
if Lo < TLo then
Lo := TLo;
end if;
if Hi > THi then
Hi := THi;
end if;
-- Convert range into required form
Append_To (Plist, Build_Range (Lo, Hi));
end if;
end;
end loop;
-- Processing was successful and all entries were static, so now we
-- can store the result as the predicate list.
Set_Static_Discrete_Predicate (Typ, Plist);
-- The processing for static predicates put the expression into
-- canonical form as a series of ranges. It also eliminated
-- duplicates and collapsed and combined ranges. We might as well
-- replace the alternatives list of the right operand of the
-- membership test with the static predicate list, which will
-- usually be more efficient.
declare
New_Alts : constant List_Id := New_List;
Old_Node : Node_Id;
New_Node : Node_Id;
begin
Old_Node := First (Plist);
while Present (Old_Node) loop
New_Node := New_Copy (Old_Node);
if Nkind (New_Node) = N_Range then
Set_Low_Bound (New_Node, New_Copy (Low_Bound (Old_Node)));
Set_High_Bound (New_Node, New_Copy (High_Bound (Old_Node)));
end if;
Append_To (New_Alts, New_Node);
Next (Old_Node);
end loop;
-- If empty list, replace by False
if Is_Empty_List (New_Alts) then
Rewrite (Expr, New_Occurrence_Of (Standard_False, Loc));
-- Else replace by set membership test
else
Rewrite (Expr,
Make_In (Loc,
Left_Opnd => Make_Identifier (Loc, Nam),
Right_Opnd => Empty,
Alternatives => New_Alts));
-- Resolve new expression in function context
Install_Formals (Predicate_Function (Typ));
Push_Scope (Predicate_Function (Typ));
Analyze_And_Resolve (Expr, Standard_Boolean);
Pop_Scope;
end if;
end;
end;
-- If non-static, return doing nothing
exception
when Non_Static =>
return;
end Build_Discrete_Static_Predicate;
--------------------------------
-- Build_Export_Import_Pragma --
--------------------------------
function Build_Export_Import_Pragma
(Asp : Node_Id;
Id : Entity_Id) return Node_Id
is
Asp_Id : constant Aspect_Id := Get_Aspect_Id (Asp);
Expr : constant Node_Id := Expression (Asp);
Loc : constant Source_Ptr := Sloc (Asp);
Args : List_Id;
Conv : Node_Id;
Conv_Arg : Node_Id;
Dummy_1 : Node_Id;
Dummy_2 : Node_Id;
EN : Node_Id;
LN : Node_Id;
Prag : Node_Id;
Create_Pragma : Boolean := False;
-- This flag is set when the aspect form is such that it warrants the
-- creation of a corresponding pragma.
begin
if Present (Expr) then
if Error_Posted (Expr) then
null;
elsif Is_True (Expr_Value (Expr)) then
Create_Pragma := True;
end if;
-- Otherwise the aspect defaults to True
else
Create_Pragma := True;
end if;
-- Nothing to do when the expression is False or is erroneous
if not Create_Pragma then
return Empty;
end if;
-- Obtain all interfacing aspects that apply to the related entity
Get_Interfacing_Aspects
(Iface_Asp => Asp,
Conv_Asp => Conv,
EN_Asp => EN,
Expo_Asp => Dummy_1,
Imp_Asp => Dummy_2,
LN_Asp => LN);
Args := New_List;
-- Handle the convention argument
if Present (Conv) then
Conv_Arg := New_Copy_Tree (Expression (Conv));
-- Assume convention "Ada' when aspect Convention is missing
else
Conv_Arg := Make_Identifier (Loc, Name_Ada);
end if;
Append_To (Args,
Make_Pragma_Argument_Association (Loc,
Chars => Name_Convention,
Expression => Conv_Arg));
-- Handle the entity argument
Append_To (Args,
Make_Pragma_Argument_Association (Loc,
Chars => Name_Entity,
Expression => New_Occurrence_Of (Id, Loc)));
-- Handle the External_Name argument
if Present (EN) then
Append_To (Args,
Make_Pragma_Argument_Association (Loc,
Chars => Name_External_Name,
Expression => New_Copy_Tree (Expression (EN))));
end if;
-- Handle the Link_Name argument
if Present (LN) then
Append_To (Args,
Make_Pragma_Argument_Association (Loc,
Chars => Name_Link_Name,
Expression => New_Copy_Tree (Expression (LN))));
end if;
-- Generate:
-- pragma Export/Import
-- (Convention => <Conv>/Ada,
-- Entity => <Id>,
-- [External_Name => <EN>,]
-- [Link_Name => <LN>]);
Prag :=
Make_Pragma (Loc,
Pragma_Identifier =>
Make_Identifier (Loc, Chars (Identifier (Asp))),
Pragma_Argument_Associations => Args);
-- Decorate the relevant aspect and the pragma
Set_Aspect_Rep_Item (Asp, Prag);
Set_Corresponding_Aspect (Prag, Asp);
Set_From_Aspect_Specification (Prag);
Set_Parent (Prag, Asp);
if Asp_Id = Aspect_Import and then Is_Subprogram (Id) then
Set_Import_Pragma (Id, Prag);
end if;
return Prag;
end Build_Export_Import_Pragma;
-------------------------------
-- Build_Predicate_Functions --
-------------------------------
-- The functions that are constructed here have the form:
-- function typPredicate (Ixxx : typ) return Boolean is
-- begin
-- return
-- typ1Predicate (typ1 (Ixxx))
-- and then typ2Predicate (typ2 (Ixxx))
-- and then ...
-- and then exp1 and then exp2 and then ...;
-- end typPredicate;
-- Here exp1, and exp2 are expressions from Predicate pragmas. Note that
-- this is the point at which these expressions get analyzed, providing the
-- required delay, and typ1, typ2, are entities from which predicates are
-- inherited. Note that we do NOT generate Check pragmas, that's because we
-- use this function even if checks are off, e.g. for membership tests.
-- Note that the inherited predicates are evaluated first, as required by
-- AI12-0071-1.
-- Note that Sem_Eval.Real_Or_String_Static_Predicate_Matches depends on
-- the form of this return expression.
-- If the expression has at least one Raise_Expression, then we also build
-- the typPredicateM version of the function, in which any occurrence of a
-- Raise_Expression is converted to "return False".
-- WARNING: This routine manages Ghost regions. Return statements must be
-- replaced by gotos which jump to the end of the routine and restore the
-- Ghost mode.
procedure Build_Predicate_Functions (Typ : Entity_Id; N : Node_Id) is
Loc : constant Source_Ptr := Sloc (Typ);
Expr : Node_Id;
-- This is the expression for the result of the function. It is
-- is build by connecting the component predicates with AND THEN.
Expr_M : Node_Id := Empty; -- init to avoid warning
-- This is the corresponding return expression for the Predicate_M
-- function. It differs in that raise expressions are marked for
-- special expansion (see Process_REs).
Object_Name : Name_Id;
-- Name for argument of Predicate procedure. Note that we use the same
-- name for both predicate functions. That way the reference within the
-- predicate expression is the same in both functions.
Object_Entity : Entity_Id;
-- Entity for argument of Predicate procedure
Object_Entity_M : Entity_Id;
-- Entity for argument of separate Predicate procedure when exceptions
-- are present in expression.
FDecl : Node_Id;
-- The function declaration
SId : Entity_Id;
-- Its entity
Raise_Expression_Present : Boolean := False;
-- Set True if Expr has at least one Raise_Expression
procedure Add_Condition (Cond : Node_Id);
-- Append Cond to Expr using "and then" (or just copy Cond to Expr if
-- Expr is empty).
procedure Add_Predicates;
-- Appends expressions for any Predicate pragmas in the rep item chain
-- Typ to Expr. Note that we look only at items for this exact entity.
-- Inheritance of predicates for the parent type is done by calling the
-- Predicate_Function of the parent type, using Add_Call above.
procedure Add_Call (T : Entity_Id);
-- Includes a call to the predicate function for type T in Expr if T
-- has predicates and Predicate_Function (T) is non-empty.
function Process_RE (N : Node_Id) return Traverse_Result;
-- Used in Process REs, tests if node N is a raise expression, and if
-- so, marks it to be converted to return False.
procedure Process_REs is new Traverse_Proc (Process_RE);
-- Marks any raise expressions in Expr_M to return False
function Test_RE (N : Node_Id) return Traverse_Result;
-- Used in Test_REs, tests one node for being a raise expression, and if
-- so sets Raise_Expression_Present True.
procedure Test_REs is new Traverse_Proc (Test_RE);
-- Tests to see if Expr contains any raise expressions
--------------
-- Add_Call --
--------------
procedure Add_Call (T : Entity_Id) is
Exp : Node_Id;
begin
if Present (T) and then Present (Predicate_Function (T)) then
Set_Has_Predicates (Typ);
-- Build the call to the predicate function of T. The type may be
-- derived, so use an unchecked conversion for the actual.
Exp :=
Make_Predicate_Call
(Typ => T,
Expr =>
Unchecked_Convert_To (T,
Make_Identifier (Loc, Object_Name)));
-- "and"-in the call to evolving expression
Add_Condition (Exp);
-- Output info message on inheritance if required. Note we do not
-- give this information for generic actual types, since it is
-- unwelcome noise in that case in instantiations. We also
-- generally suppress the message in instantiations, and also
-- if it involves internal names.
if Opt.List_Inherited_Aspects
and then not Is_Generic_Actual_Type (Typ)
and then Instantiation_Depth (Sloc (Typ)) = 0
and then not Is_Internal_Name (Chars (T))
and then not Is_Internal_Name (Chars (Typ))
then
Error_Msg_Sloc := Sloc (Predicate_Function (T));
Error_Msg_Node_2 := T;
Error_Msg_N ("info: & inherits predicate from & #?L?", Typ);
end if;
end if;
end Add_Call;
-------------------
-- Add_Condition --
-------------------
procedure Add_Condition (Cond : Node_Id) is
begin
-- This is the first predicate expression
if No (Expr) then
Expr := Cond;
-- Otherwise concatenate to the existing predicate expressions by
-- using "and then".
else
Expr :=
Make_And_Then (Loc,
Left_Opnd => Relocate_Node (Expr),
Right_Opnd => Cond);
end if;
end Add_Condition;
--------------------
-- Add_Predicates --
--------------------
procedure Add_Predicates is
procedure Add_Predicate (Prag : Node_Id);
-- Concatenate the expression of predicate pragma Prag to Expr by
-- using a short circuit "and then" operator.
-------------------
-- Add_Predicate --
-------------------
procedure Add_Predicate (Prag : Node_Id) is
procedure Replace_Type_Reference (N : Node_Id);
-- Replace a single occurrence N of the subtype name with a
-- reference to the formal of the predicate function. N can be an
-- identifier referencing the subtype, or a selected component,
-- representing an appropriately qualified occurrence of the
-- subtype name.
procedure Replace_Type_References is
new Replace_Type_References_Generic (Replace_Type_Reference);
-- Traverse an expression changing every occurrence of an
-- identifier whose name matches the name of the subtype with a
-- reference to the formal parameter of the predicate function.
----------------------------
-- Replace_Type_Reference --
----------------------------
procedure Replace_Type_Reference (N : Node_Id) is
begin
Rewrite (N, Make_Identifier (Sloc (N), Object_Name));
-- Use the Sloc of the usage name, not the defining name
Set_Etype (N, Typ);
Set_Entity (N, Object_Entity);
-- We want to treat the node as if it comes from source, so
-- that ASIS will not ignore it.
Set_Comes_From_Source (N, True);
end Replace_Type_Reference;
-- Local variables
Asp : constant Node_Id := Corresponding_Aspect (Prag);
Arg1 : Node_Id;
Arg2 : Node_Id;
-- Start of processing for Add_Predicate
begin
-- Mark corresponding SCO as enabled
Set_SCO_Pragma_Enabled (Sloc (Prag));
-- Extract the arguments of the pragma. The expression itself
-- is copied for use in the predicate function, to preserve the
-- original version for ASIS use.
Arg1 := First (Pragma_Argument_Associations (Prag));
Arg2 := Next (Arg1);
Arg1 := Get_Pragma_Arg (Arg1);
Arg2 := New_Copy_Tree (Get_Pragma_Arg (Arg2));
-- When the predicate pragma applies to the current type or its
-- full view, replace all occurrences of the subtype name with
-- references to the formal parameter of the predicate function.
if Entity (Arg1) = Typ
or else Full_View (Entity (Arg1)) = Typ
then
Replace_Type_References (Arg2, Typ);
-- If the predicate pragma comes from an aspect, replace the
-- saved expression because we need the subtype references
-- replaced for the calls to Preanalyze_Spec_Expression in
-- Check_Aspect_At_xxx routines.
if Present (Asp) then
Set_Entity (Identifier (Asp), New_Copy_Tree (Arg2));
end if;
-- "and"-in the Arg2 condition to evolving expression
Add_Condition (Relocate_Node (Arg2));
end if;
end Add_Predicate;
-- Local variables
Ritem : Node_Id;
-- Start of processing for Add_Predicates
begin
Ritem := First_Rep_Item (Typ);
-- If the type is private, check whether full view has inherited
-- predicates.
if Is_Private_Type (Typ) and then No (Ritem) then
Ritem := First_Rep_Item (Full_View (Typ));
end if;
while Present (Ritem) loop
if Nkind (Ritem) = N_Pragma
and then Pragma_Name (Ritem) = Name_Predicate
then
Add_Predicate (Ritem);
-- If the type is declared in an inner package it may be frozen
-- outside of the package, and the generated pragma has not been
-- analyzed yet, so capture the expression for the predicate
-- function at this point.
elsif Nkind (Ritem) = N_Aspect_Specification
and then Present (Aspect_Rep_Item (Ritem))
and then Scope (Typ) /= Current_Scope
then
declare
Prag : constant Node_Id := Aspect_Rep_Item (Ritem);
begin
if Nkind (Prag) = N_Pragma
and then Pragma_Name (Prag) = Name_Predicate
then
Add_Predicate (Prag);
end if;
end;
end if;
Next_Rep_Item (Ritem);
end loop;
end Add_Predicates;
----------------
-- Process_RE --
----------------
function Process_RE (N : Node_Id) return Traverse_Result is
begin
if Nkind (N) = N_Raise_Expression then
Set_Convert_To_Return_False (N);
return Skip;
else
return OK;
end if;
end Process_RE;
-------------
-- Test_RE --
-------------
function Test_RE (N : Node_Id) return Traverse_Result is
begin
if Nkind (N) = N_Raise_Expression then
Raise_Expression_Present := True;
return Abandon;
else
return OK;
end if;
end Test_RE;
-- Local variables
Saved_GM : constant Ghost_Mode_Type := Ghost_Mode;
-- Save the Ghost mode to restore on exit
-- Start of processing for Build_Predicate_Functions
begin
-- Return if already built or if type does not have predicates
SId := Predicate_Function (Typ);
if not Has_Predicates (Typ)
or else (Present (SId) and then Has_Completion (SId))
then
return;
end if;
-- The related type may be subject to pragma Ghost. Set the mode now to
-- ensure that the predicate functions are properly marked as Ghost.
Set_Ghost_Mode (Typ);
-- Prepare to construct predicate expression
Expr := Empty;
if Present (SId) then
FDecl := Unit_Declaration_Node (SId);
else
FDecl := Build_Predicate_Function_Declaration (Typ);
SId := Defining_Entity (FDecl);
end if;
-- Recover name of formal parameter of function that replaces references
-- to the type in predicate expressions.
Object_Entity :=
Defining_Identifier
(First (Parameter_Specifications (Specification (FDecl))));
Object_Name := Chars (Object_Entity);
Object_Entity_M := Make_Defining_Identifier (Loc, Chars => Object_Name);
-- Add predicates for ancestor if present. These must come before the
-- ones for the current type, as required by AI12-0071-1.
declare
Atyp : Entity_Id;
begin
Atyp := Nearest_Ancestor (Typ);
-- The type may be private but the full view may inherit predicates
if No (Atyp) and then Is_Private_Type (Typ) then
Atyp := Nearest_Ancestor (Full_View (Typ));
end if;
if Present (Atyp) then
Add_Call (Atyp);
end if;
end;
-- Add Predicates for the current type
Add_Predicates;
-- Case where predicates are present
if Present (Expr) then
-- Test for raise expression present
Test_REs (Expr);
-- If raise expression is present, capture a copy of Expr for use
-- in building the predicateM function version later on. For this
-- copy we replace references to Object_Entity by Object_Entity_M.
if Raise_Expression_Present then
declare
Map : constant Elist_Id := New_Elmt_List;
New_V : Entity_Id := Empty;
-- The unanalyzed expression will be copied and appear in
-- both functions. Normally expressions do not declare new
-- entities, but quantified expressions do, so we need to
-- create new entities for their bound variables, to prevent
-- multiple definitions in gigi.
function Reset_Loop_Variable (N : Node_Id)
return Traverse_Result;
procedure Collect_Loop_Variables is
new Traverse_Proc (Reset_Loop_Variable);
------------------------
-- Reset_Loop_Variable --
------------------------
function Reset_Loop_Variable (N : Node_Id)
return Traverse_Result
is
begin
if Nkind (N) = N_Iterator_Specification then
New_V := Make_Defining_Identifier
(Sloc (N), Chars (Defining_Identifier (N)));
Set_Defining_Identifier (N, New_V);
end if;
return OK;
end Reset_Loop_Variable;
begin
Append_Elmt (Object_Entity, Map);
Append_Elmt (Object_Entity_M, Map);
Expr_M := New_Copy_Tree (Expr, Map => Map);
Collect_Loop_Variables (Expr_M);
end;
end if;
-- Build the main predicate function
declare
SIdB : constant Entity_Id :=
Make_Defining_Identifier (Loc,
Chars => New_External_Name (Chars (Typ), "Predicate"));
-- The entity for the function body
Spec : Node_Id;
FBody : Node_Id;
begin
Set_Ekind (SIdB, E_Function);
Set_Is_Predicate_Function (SIdB);
-- The predicate function is shared between views of a type
if Is_Private_Type (Typ) and then Present (Full_View (Typ)) then
Set_Predicate_Function (Full_View (Typ), SId);
end if;
-- Build function body
Spec :=
Make_Function_Specification (Loc,
Defining_Unit_Name => SIdB,
Parameter_Specifications => New_List (
Make_Parameter_Specification (Loc,
Defining_Identifier =>
Make_Defining_Identifier (Loc, Object_Name),
Parameter_Type =>
New_Occurrence_Of (Typ, Loc))),
Result_Definition =>
New_Occurrence_Of (Standard_Boolean, Loc));
FBody :=
Make_Subprogram_Body (Loc,
Specification => Spec,
Declarations => Empty_List,
Handled_Statement_Sequence =>
Make_Handled_Sequence_Of_Statements (Loc,
Statements => New_List (
Make_Simple_Return_Statement (Loc,
Expression => Expr))));
-- If declaration has not been analyzed yet, Insert declaration
-- before freeze node. Insert body itself after freeze node.
if not Analyzed (FDecl) then
Insert_Before_And_Analyze (N, FDecl);
end if;
Insert_After_And_Analyze (N, FBody);
-- Static predicate functions are always side-effect free, and
-- in most cases dynamic predicate functions are as well. Mark
-- them as such whenever possible, so redundant predicate checks
-- can be optimized. If there is a variable reference within the
-- expression, the function is not pure.
if Expander_Active then
Set_Is_Pure (SId,
Side_Effect_Free (Expr, Variable_Ref => True));
Set_Is_Inlined (SId);
end if;
end;
-- Test for raise expressions present and if so build M version
if Raise_Expression_Present then
declare
SId : constant Entity_Id :=
Make_Defining_Identifier (Loc,
Chars => New_External_Name (Chars (Typ), "PredicateM"));
-- The entity for the function spec
SIdB : constant Entity_Id :=
Make_Defining_Identifier (Loc,
Chars => New_External_Name (Chars (Typ), "PredicateM"));
-- The entity for the function body
Spec : Node_Id;
FBody : Node_Id;
FDecl : Node_Id;
BTemp : Entity_Id;
begin
-- Mark any raise expressions for special expansion
Process_REs (Expr_M);
-- Build function declaration
Set_Ekind (SId, E_Function);
Set_Is_Predicate_Function_M (SId);
Set_Predicate_Function_M (Typ, SId);
-- The predicate function is shared between views of a type
if Is_Private_Type (Typ) and then Present (Full_View (Typ)) then
Set_Predicate_Function_M (Full_View (Typ), SId);
end if;
Spec :=
Make_Function_Specification (Loc,
Defining_Unit_Name => SId,
Parameter_Specifications => New_List (
Make_Parameter_Specification (Loc,
Defining_Identifier => Object_Entity_M,
Parameter_Type => New_Occurrence_Of (Typ, Loc))),
Result_Definition =>
New_Occurrence_Of (Standard_Boolean, Loc));
FDecl :=
Make_Subprogram_Declaration (Loc,
Specification => Spec);
-- Build function body
Spec :=
Make_Function_Specification (Loc,
Defining_Unit_Name => SIdB,
Parameter_Specifications => New_List (
Make_Parameter_Specification (Loc,
Defining_Identifier =>
Make_Defining_Identifier (Loc, Object_Name),
Parameter_Type =>
New_Occurrence_Of (Typ, Loc))),
Result_Definition =>
New_Occurrence_Of (Standard_Boolean, Loc));
-- Build the body, we declare the boolean expression before
-- doing the return, because we are not really confident of
-- what happens if a return appears within a return.
BTemp :=
Make_Defining_Identifier (Loc,
Chars => New_Internal_Name ('B'));
FBody :=
Make_Subprogram_Body (Loc,
Specification => Spec,
Declarations => New_List (
Make_Object_Declaration (Loc,
Defining_Identifier => BTemp,
Constant_Present => True,
Object_Definition =>
New_Occurrence_Of (Standard_Boolean, Loc),
Expression => Expr_M)),
Handled_Statement_Sequence =>
Make_Handled_Sequence_Of_Statements (Loc,
Statements => New_List (
Make_Simple_Return_Statement (Loc,
Expression => New_Occurrence_Of (BTemp, Loc)))));
-- Insert declaration before freeze node and body after
Insert_Before_And_Analyze (N, FDecl);
Insert_After_And_Analyze (N, FBody);
end;
end if;
-- See if we have a static predicate. Note that the answer may be
-- yes even if we have an explicit Dynamic_Predicate present.
declare
PS : Boolean;
EN : Node_Id;
begin
if not Is_Scalar_Type (Typ) and then not Is_String_Type (Typ) then
PS := False;
else
PS := Is_Predicate_Static (Expr, Object_Name);
end if;
-- Case where we have a predicate-static aspect
if PS then
-- We don't set Has_Static_Predicate_Aspect, since we can have
-- any of the three cases (Predicate, Dynamic_Predicate, or
-- Static_Predicate) generating a predicate with an expression
-- that is predicate-static. We just indicate that we have a
-- predicate that can be treated as static.
Set_Has_Static_Predicate (Typ);
-- For discrete subtype, build the static predicate list
if Is_Discrete_Type (Typ) then
Build_Discrete_Static_Predicate (Typ, Expr, Object_Name);
-- If we don't get a static predicate list, it means that we
-- have a case where this is not possible, most typically in
-- the case where we inherit a dynamic predicate. We do not
-- consider this an error, we just leave the predicate as
-- dynamic. But if we do succeed in building the list, then
-- we mark the predicate as static.
if No (Static_Discrete_Predicate (Typ)) then
Set_Has_Static_Predicate (Typ, False);
end if;
-- For real or string subtype, save predicate expression
elsif Is_Real_Type (Typ) or else Is_String_Type (Typ) then
Set_Static_Real_Or_String_Predicate (Typ, Expr);
end if;
-- Case of dynamic predicate (expression is not predicate-static)
else
-- Again, we don't set Has_Dynamic_Predicate_Aspect, since that
-- is only set if we have an explicit Dynamic_Predicate aspect
-- given. Here we may simply have a Predicate aspect where the
-- expression happens not to be predicate-static.
-- Emit an error when the predicate is categorized as static
-- but its expression is not predicate-static.
-- First a little fiddling to get a nice location for the
-- message. If the expression is of the form (A and then B),
-- where A is an inherited predicate, then use the right
-- operand for the Sloc. This avoids getting confused by a call
-- to an inherited predicate with a less convenient source
-- location.
EN := Expr;
while Nkind (EN) = N_And_Then
and then Nkind (Left_Opnd (EN)) = N_Function_Call
and then Is_Predicate_Function
(Entity (Name (Left_Opnd (EN))))
loop
EN := Right_Opnd (EN);
end loop;
-- Now post appropriate message
if Has_Static_Predicate_Aspect (Typ) then
if Is_Scalar_Type (Typ) or else Is_String_Type (Typ) then
Error_Msg_F
("expression is not predicate-static (RM 3.2.4(16-22))",
EN);
else
Error_Msg_F
("static predicate requires scalar or string type", EN);
end if;
end if;
end if;
end;
end if;
Restore_Ghost_Mode (Saved_GM);
end Build_Predicate_Functions;
------------------------------------------
-- Build_Predicate_Function_Declaration --
------------------------------------------
-- WARNING: This routine manages Ghost regions. Return statements must be
-- replaced by gotos which jump to the end of the routine and restore the
-- Ghost mode.
function Build_Predicate_Function_Declaration
(Typ : Entity_Id) return Node_Id
is
Loc : constant Source_Ptr := Sloc (Typ);
Saved_GM : constant Ghost_Mode_Type := Ghost_Mode;
-- Save the Ghost mode to restore on exit
Func_Decl : Node_Id;
Func_Id : Entity_Id;
Spec : Node_Id;
begin
-- The related type may be subject to pragma Ghost. Set the mode now to
-- ensure that the predicate functions are properly marked as Ghost.
Set_Ghost_Mode (Typ);
Func_Id :=
Make_Defining_Identifier (Loc,
Chars => New_External_Name (Chars (Typ), "Predicate"));
-- The predicate function requires debug info when the predicates are
-- subject to Source Coverage Obligations.
if Opt.Generate_SCO then
Set_Debug_Info_Needed (Func_Id);
end if;
Spec :=
Make_Function_Specification (Loc,
Defining_Unit_Name => Func_Id,
Parameter_Specifications => New_List (
Make_Parameter_Specification (Loc,
Defining_Identifier => Make_Temporary (Loc, 'I'),
Parameter_Type => New_Occurrence_Of (Typ, Loc))),
Result_Definition =>
New_Occurrence_Of (Standard_Boolean, Loc));
Func_Decl := Make_Subprogram_Declaration (Loc, Specification => Spec);
Set_Ekind (Func_Id, E_Function);
Set_Etype (Func_Id, Standard_Boolean);
Set_Is_Internal (Func_Id);
Set_Is_Predicate_Function (Func_Id);
Set_Predicate_Function (Typ, Func_Id);
Insert_After (Parent (Typ), Func_Decl);
Analyze (Func_Decl);
Restore_Ghost_Mode (Saved_GM);
return Func_Decl;
end Build_Predicate_Function_Declaration;
-----------------------------------------
-- Check_Aspect_At_End_Of_Declarations --
-----------------------------------------
procedure Check_Aspect_At_End_Of_Declarations (ASN : Node_Id) is
Ent : constant Entity_Id := Entity (ASN);
Ident : constant Node_Id := Identifier (ASN);
A_Id : constant Aspect_Id := Get_Aspect_Id (Chars (Ident));
End_Decl_Expr : constant Node_Id := Entity (Ident);
-- Expression to be analyzed at end of declarations
Freeze_Expr : constant Node_Id := Expression (ASN);
-- Expression from call to Check_Aspect_At_Freeze_Point.
T : constant Entity_Id := Etype (Original_Node (Freeze_Expr));
-- Type required for preanalyze call. We use the original expression to
-- get the proper type, to prevent cascaded errors when the expression
-- is constant-folded.
Err : Boolean;
-- Set False if error
-- On entry to this procedure, Entity (Ident) contains a copy of the
-- original expression from the aspect, saved for this purpose, and
-- but Expression (Ident) is a preanalyzed copy of the expression,
-- preanalyzed just after the freeze point.
procedure Check_Overloaded_Name;
-- For aspects whose expression is simply a name, this routine checks if
-- the name is overloaded or not. If so, it verifies there is an
-- interpretation that matches the entity obtained at the freeze point,
-- otherwise the compiler complains.
---------------------------
-- Check_Overloaded_Name --
---------------------------
procedure Check_Overloaded_Name is
begin
if not Is_Overloaded (End_Decl_Expr) then
Err := not Is_Entity_Name (End_Decl_Expr)
or else Entity (End_Decl_Expr) /= Entity (Freeze_Expr);
else
Err := True;
declare
Index : Interp_Index;
It : Interp;
begin
Get_First_Interp (End_Decl_Expr, Index, It);
while Present (It.Typ) loop
if It.Nam = Entity (Freeze_Expr) then
Err := False;
exit;
end if;
Get_Next_Interp (Index, It);
end loop;
end;
end if;
end Check_Overloaded_Name;
-- Start of processing for Check_Aspect_At_End_Of_Declarations
begin
-- In an instance we do not perform the consistency check between freeze
-- point and end of declarations, because it was done already in the
-- analysis of the generic. Furthermore, the delayed analysis of an
-- aspect of the instance may produce spurious errors when the generic
-- is a child unit that references entities in the parent (which might
-- not be in scope at the freeze point of the instance).
if In_Instance then
return;
-- The enclosing scope may have been rewritten during expansion (.e.g. a
-- task body is rewritten as a procedure) after this conformance check
-- has been performed, so do not perform it again (it may not easily be
-- done if full visibility of local entities is not available).
elsif not Comes_From_Source (Current_Scope) then
return;
-- Case of aspects Dimension, Dimension_System and Synchronization
elsif A_Id = Aspect_Synchronization then
return;
-- Case of stream attributes, just have to compare entities. However,
-- the expression is just a name (possibly overloaded), and there may
-- be stream operations declared for unrelated types, so we just need
-- to verify that one of these interpretations is the one available at
-- at the freeze point.
elsif A_Id = Aspect_Input or else
A_Id = Aspect_Output or else
A_Id = Aspect_Read or else
A_Id = Aspect_Write
then
Analyze (End_Decl_Expr);
Check_Overloaded_Name;
elsif A_Id = Aspect_Variable_Indexing or else
A_Id = Aspect_Constant_Indexing or else
A_Id = Aspect_Default_Iterator or else
A_Id = Aspect_Iterator_Element
then
-- Make type unfrozen before analysis, to prevent spurious errors
-- about late attributes.
Set_Is_Frozen (Ent, False);
Analyze (End_Decl_Expr);
Set_Is_Frozen (Ent, True);
-- If the end of declarations comes before any other freeze
-- point, the Freeze_Expr is not analyzed: no check needed.
if Analyzed (Freeze_Expr) and then not In_Instance then
Check_Overloaded_Name;
else
Err := False;
end if;
-- All other cases
else
-- Indicate that the expression comes from an aspect specification,
-- which is used in subsequent analysis even if expansion is off.
Set_Parent (End_Decl_Expr, ASN);
-- In a generic context the aspect expressions have not been
-- preanalyzed, so do it now. There are no conformance checks
-- to perform in this case.
if No (T) then
Check_Aspect_At_Freeze_Point (ASN);
return;
-- The default values attributes may be defined in the private part,
-- and the analysis of the expression may take place when only the
-- partial view is visible. The expression must be scalar, so use
-- the full view to resolve.
elsif (A_Id = Aspect_Default_Value
or else
A_Id = Aspect_Default_Component_Value)
and then Is_Private_Type (T)
then
Preanalyze_Spec_Expression (End_Decl_Expr, Full_View (T));
else
Preanalyze_Spec_Expression (End_Decl_Expr, T);
end if;
Err := not Fully_Conformant_Expressions (End_Decl_Expr, Freeze_Expr);
end if;
-- Output error message if error. Force error on aspect specification
-- even if there is an error on the expression itself.
if Err then
Error_Msg_NE
("!visibility of aspect for& changes after freeze point",
ASN, Ent);
Error_Msg_NE
("info: & is frozen here, aspects evaluated at this point??",
Freeze_Node (Ent), Ent);
end if;
end Check_Aspect_At_End_Of_Declarations;
----------------------------------
-- Check_Aspect_At_Freeze_Point --
----------------------------------
procedure Check_Aspect_At_Freeze_Point (ASN : Node_Id) is
Ident : constant Node_Id := Identifier (ASN);
-- Identifier (use Entity field to save expression)
A_Id : constant Aspect_Id := Get_Aspect_Id (Chars (Ident));
T : Entity_Id := Empty;
-- Type required for preanalyze call
begin
-- On entry to this procedure, Entity (Ident) contains a copy of the
-- original expression from the aspect, saved for this purpose.
-- On exit from this procedure Entity (Ident) is unchanged, still
-- containing that copy, but Expression (Ident) is a preanalyzed copy
-- of the expression, preanalyzed just after the freeze point.
-- Make a copy of the expression to be preanalyzed
Set_Expression (ASN, New_Copy_Tree (Entity (Ident)));
-- Find type for preanalyze call
case A_Id is
-- No_Aspect should be impossible
when No_Aspect =>
raise Program_Error;
-- Aspects taking an optional boolean argument
when Boolean_Aspects
| Library_Unit_Aspects
=>
T := Standard_Boolean;
-- Aspects corresponding to attribute definition clauses
when Aspect_Address =>
T := RTE (RE_Address);
when Aspect_Attach_Handler =>
T := RTE (RE_Interrupt_ID);
when Aspect_Bit_Order
| Aspect_Scalar_Storage_Order
=>
T := RTE (RE_Bit_Order);
when Aspect_Convention =>
return;
when Aspect_CPU =>
T := RTE (RE_CPU_Range);
-- Default_Component_Value is resolved with the component type
when Aspect_Default_Component_Value =>
T := Component_Type (Entity (ASN));
when Aspect_Default_Storage_Pool =>
T := Class_Wide_Type (RTE (RE_Root_Storage_Pool));
-- Default_Value is resolved with the type entity in question
when Aspect_Default_Value =>
T := Entity (ASN);
when Aspect_Dispatching_Domain =>
T := RTE (RE_Dispatching_Domain);
when Aspect_External_Tag =>
T := Standard_String;
when Aspect_External_Name =>
T := Standard_String;
when Aspect_Link_Name =>
T := Standard_String;
when Aspect_Interrupt_Priority
| Aspect_Priority
=>
T := Standard_Integer;
when Aspect_Relative_Deadline =>
T := RTE (RE_Time_Span);
when Aspect_Secondary_Stack_Size =>
T := Standard_Integer;
when Aspect_Small =>
-- Note that the expression can be of any real type (not just a
-- real universal literal) as long as it is a static constant.
T := Any_Real;
-- For a simple storage pool, we have to retrieve the type of the
-- pool object associated with the aspect's corresponding attribute
-- definition clause.
when Aspect_Simple_Storage_Pool =>
T := Etype (Expression (Aspect_Rep_Item (ASN)));
when Aspect_Storage_Pool =>
T := Class_Wide_Type (RTE (RE_Root_Storage_Pool));
when Aspect_Alignment
| Aspect_Component_Size
| Aspect_Machine_Radix
| Aspect_Object_Size
| Aspect_Size
| Aspect_Storage_Size
| Aspect_Stream_Size
| Aspect_Value_Size
=>
T := Any_Integer;
when Aspect_Linker_Section =>
T := Standard_String;
when Aspect_Synchronization =>
return;
-- Special case, the expression of these aspects is just an entity
-- that does not need any resolution, so just analyze.
when Aspect_Input
| Aspect_Output
| Aspect_Read
| Aspect_Suppress
| Aspect_Unsuppress
| Aspect_Warnings
| Aspect_Write
=>
Analyze (Expression (ASN));
return;
-- Same for Iterator aspects, where the expression is a function
-- name. Legality rules are checked separately.
when Aspect_Constant_Indexing
| Aspect_Default_Iterator
| Aspect_Iterator_Element
| Aspect_Variable_Indexing
=>
Analyze (Expression (ASN));
return;
-- Ditto for Iterable, legality checks in Validate_Iterable_Aspect.
when Aspect_Iterable =>
T := Entity (ASN);
declare
Cursor : constant Entity_Id := Get_Cursor_Type (ASN, T);
Assoc : Node_Id;
Expr : Node_Id;
begin
if Cursor = Any_Type then
return;
end if;
Assoc := First (Component_Associations (Expression (ASN)));
while Present (Assoc) loop
Expr := Expression (Assoc);
Analyze (Expr);
if not Error_Posted (Expr) then
Resolve_Iterable_Operation
(Expr, Cursor, T, Chars (First (Choices (Assoc))));
end if;
Next (Assoc);
end loop;
end;
return;
-- Invariant/Predicate take boolean expressions
when Aspect_Dynamic_Predicate
| Aspect_Invariant
| Aspect_Predicate
| Aspect_Static_Predicate
| Aspect_Type_Invariant
=>
T := Standard_Boolean;
when Aspect_Predicate_Failure =>
T := Standard_String;
-- Here is the list of aspects that don't require delay analysis
when Aspect_Abstract_State
| Aspect_Annotate
| Aspect_Async_Readers
| Aspect_Async_Writers
| Aspect_Constant_After_Elaboration
| Aspect_Contract_Cases
| Aspect_Default_Initial_Condition
| Aspect_Depends
| Aspect_Dimension
| Aspect_Dimension_System
| Aspect_Effective_Reads
| Aspect_Effective_Writes
| Aspect_Extensions_Visible
| Aspect_Ghost
| Aspect_Global
| Aspect_Implicit_Dereference
| Aspect_Initial_Condition
| Aspect_Initializes
| Aspect_Max_Queue_Length
| Aspect_Obsolescent
| Aspect_Part_Of
| Aspect_Post
| Aspect_Postcondition
| Aspect_Pre
| Aspect_Precondition
| Aspect_Refined_Depends
| Aspect_Refined_Global
| Aspect_Refined_Post
| Aspect_Refined_State
| Aspect_SPARK_Mode
| Aspect_Test_Case
| Aspect_Unimplemented
| Aspect_Volatile_Function
=>
raise Program_Error;
end case;
-- Do the preanalyze call
Preanalyze_Spec_Expression (Expression (ASN), T);
end Check_Aspect_At_Freeze_Point;
-----------------------------------
-- Check_Constant_Address_Clause --
-----------------------------------
procedure Check_Constant_Address_Clause
(Expr : Node_Id;
U_Ent : Entity_Id)
is
procedure Check_At_Constant_Address (Nod : Node_Id);
-- Checks that the given node N represents a name whose 'Address is
-- constant (in the same sense as OK_Constant_Address_Clause, i.e. the
-- address value is the same at the point of declaration of U_Ent and at
-- the time of elaboration of the address clause.
procedure Check_Expr_Constants (Nod : Node_Id);
-- Checks that Nod meets the requirements for a constant address clause
-- in the sense of the enclosing procedure.
procedure Check_List_Constants (Lst : List_Id);
-- Check that all elements of list Lst meet the requirements for a
-- constant address clause in the sense of the enclosing procedure.
-------------------------------
-- Check_At_Constant_Address --
-------------------------------
procedure Check_At_Constant_Address (Nod : Node_Id) is
begin
if Is_Entity_Name (Nod) then
if Present (Address_Clause (Entity ((Nod)))) then
Error_Msg_NE
("invalid address clause for initialized object &!",
Nod, U_Ent);
Error_Msg_NE
("address for& cannot depend on another address clause! "
& "(RM 13.1(22))!", Nod, U_Ent);
elsif In_Same_Source_Unit (Entity (Nod), U_Ent)
and then Sloc (U_Ent) < Sloc (Entity (Nod))
then
Error_Msg_NE
("invalid address clause for initialized object &!",
Nod, U_Ent);
Error_Msg_Node_2 := U_Ent;
Error_Msg_NE
("\& must be defined before & (RM 13.1(22))!",
Nod, Entity (Nod));
end if;
elsif Nkind (Nod) = N_Selected_Component then
declare
T : constant Entity_Id := Etype (Prefix (Nod));
begin
if (Is_Record_Type (T)
and then Has_Discriminants (T))
or else
(Is_Access_Type (T)
and then Is_Record_Type (Designated_Type (T))
and then Has_Discriminants (Designated_Type (T)))
then
Error_Msg_NE
("invalid address clause for initialized object &!",
Nod, U_Ent);
Error_Msg_N
("\address cannot depend on component of discriminated "
& "record (RM 13.1(22))!", Nod);
else
Check_At_Constant_Address (Prefix (Nod));
end if;
end;
elsif Nkind (Nod) = N_Indexed_Component then
Check_At_Constant_Address (Prefix (Nod));
Check_List_Constants (Expressions (Nod));
else
Check_Expr_Constants (Nod);
end if;
end Check_At_Constant_Address;
--------------------------
-- Check_Expr_Constants --
--------------------------
procedure Check_Expr_Constants (Nod : Node_Id) is
Loc_U_Ent : constant Source_Ptr := Sloc (U_Ent);
Ent : Entity_Id := Empty;
begin
if Nkind (Nod) in N_Has_Etype
and then Etype (Nod) = Any_Type
then
return;
end if;
case Nkind (Nod) is
when N_Empty
| N_Error
=>
return;
when N_Expanded_Name
| N_Identifier
=>
Ent := Entity (Nod);
-- We need to look at the original node if it is different
-- from the node, since we may have rewritten things and
-- substituted an identifier representing the rewrite.
if Original_Node (Nod) /= Nod then
Check_Expr_Constants (Original_Node (Nod));
-- If the node is an object declaration without initial
-- value, some code has been expanded, and the expression
-- is not constant, even if the constituents might be
-- acceptable, as in A'Address + offset.
if Ekind (Ent) = E_Variable
and then
Nkind (Declaration_Node (Ent)) = N_Object_Declaration
and then
No (Expression (Declaration_Node (Ent)))
then
Error_Msg_NE
("invalid address clause for initialized object &!",
Nod, U_Ent);
-- If entity is constant, it may be the result of expanding
-- a check. We must verify that its declaration appears
-- before the object in question, else we also reject the
-- address clause.
elsif Ekind (Ent) = E_Constant
and then In_Same_Source_Unit (Ent, U_Ent)
and then Sloc (Ent) > Loc_U_Ent
then
Error_Msg_NE
("invalid address clause for initialized object &!",
Nod, U_Ent);
end if;
return;
end if;
-- Otherwise look at the identifier and see if it is OK
if Ekind_In (Ent, E_Named_Integer, E_Named_Real)
or else Is_Type (Ent)
then
return;
elsif Ekind_In (Ent, E_Constant, E_In_Parameter) then
-- This is the case where we must have Ent defined before
-- U_Ent. Clearly if they are in different units this
-- requirement is met since the unit containing Ent is
-- already processed.
if not In_Same_Source_Unit (Ent, U_Ent) then
return;
-- Otherwise location of Ent must be before the location
-- of U_Ent, that's what prior defined means.
elsif Sloc (Ent) < Loc_U_Ent then
return;
else
Error_Msg_NE
("invalid address clause for initialized object &!",
Nod, U_Ent);
Error_Msg_Node_2 := U_Ent;
Error_Msg_NE
("\& must be defined before & (RM 13.1(22))!",
Nod, Ent);
end if;
elsif Nkind (Original_Node (Nod)) = N_Function_Call then
Check_Expr_Constants (Original_Node (Nod));
else
Error_Msg_NE
("invalid address clause for initialized object &!",
Nod, U_Ent);
if Comes_From_Source (Ent) then
Error_Msg_NE
("\reference to variable& not allowed"
& " (RM 13.1(22))!", Nod, Ent);
else
Error_Msg_N
("non-static expression not allowed"
& " (RM 13.1(22))!", Nod);
end if;
end if;
when N_Integer_Literal =>
-- If this is a rewritten unchecked conversion, in a system
-- where Address is an integer type, always use the base type
-- for a literal value. This is user-friendly and prevents
-- order-of-elaboration issues with instances of unchecked
-- conversion.
if Nkind (Original_Node (Nod)) = N_Function_Call then
Set_Etype (Nod, Base_Type (Etype (Nod)));
end if;
when N_Character_Literal
| N_Real_Literal
| N_String_Literal
=>
return;
when N_Range =>
Check_Expr_Constants (Low_Bound (Nod));
Check_Expr_Constants (High_Bound (Nod));
when N_Explicit_Dereference =>
Check_Expr_Constants (Prefix (Nod));
when N_Indexed_Component =>
Check_Expr_Constants (Prefix (Nod));
Check_List_Constants (Expressions (Nod));
when N_Slice =>
Check_Expr_Constants (Prefix (Nod));
Check_Expr_Constants (Discrete_Range (Nod));
when N_Selected_Component =>
Check_Expr_Constants (Prefix (Nod));
when N_Attribute_Reference =>
if Nam_In (Attribute_Name (Nod), Name_Address,
Name_Access,
Name_Unchecked_Access,
Name_Unrestricted_Access)
then
Check_At_Constant_Address (Prefix (Nod));
-- Normally, System'To_Address will have been transformed into
-- an Unchecked_Conversion, but in -gnatc mode, it will not,
-- and we don't want to give an error, because the whole point
-- of 'To_Address is that it is static.
elsif Attribute_Name (Nod) = Name_To_Address then
pragma Assert (Operating_Mode = Check_Semantics);
null;
else
Check_Expr_Constants (Prefix (Nod));
Check_List_Constants (Expressions (Nod));
end if;
when N_Aggregate =>
Check_List_Constants (Component_Associations (Nod));
Check_List_Constants (Expressions (Nod));
when N_Component_Association =>
Check_Expr_Constants (Expression (Nod));
when N_Extension_Aggregate =>
Check_Expr_Constants (Ancestor_Part (Nod));
Check_List_Constants (Component_Associations (Nod));
Check_List_Constants (Expressions (Nod));
when N_Null =>
return;
when N_Binary_Op
| N_Membership_Test
| N_Short_Circuit
=>
Check_Expr_Constants (Left_Opnd (Nod));
Check_Expr_Constants (Right_Opnd (Nod));
when N_Unary_Op =>
Check_Expr_Constants (Right_Opnd (Nod));
when N_Allocator
| N_Qualified_Expression
| N_Type_Conversion
| N_Unchecked_Type_Conversion
=>
Check_Expr_Constants (Expression (Nod));
when N_Function_Call =>
if not Is_Pure (Entity (Name (Nod))) then
Error_Msg_NE
("invalid address clause for initialized object &!",
Nod, U_Ent);
Error_Msg_NE
("\function & is not pure (RM 13.1(22))!",
Nod, Entity (Name (Nod)));
else
Check_List_Constants (Parameter_Associations (Nod));
end if;
when N_Parameter_Association =>
Check_Expr_Constants (Explicit_Actual_Parameter (Nod));
when others =>
Error_Msg_NE
("invalid address clause for initialized object &!",
Nod, U_Ent);
Error_Msg_NE
("\must be constant defined before& (RM 13.1(22))!",
Nod, U_Ent);
end case;
end Check_Expr_Constants;
--------------------------
-- Check_List_Constants --
--------------------------
procedure Check_List_Constants (Lst : List_Id) is
Nod1 : Node_Id;
begin
if Present (Lst) then
Nod1 := First (Lst);
while Present (Nod1) loop
Check_Expr_Constants (Nod1);
Next (Nod1);
end loop;
end if;
end Check_List_Constants;
-- Start of processing for Check_Constant_Address_Clause
begin
-- If rep_clauses are to be ignored, no need for legality checks. In
-- particular, no need to pester user about rep clauses that violate the
-- rule on constant addresses, given that these clauses will be removed
-- by Freeze before they reach the back end. Similarly in CodePeer mode,
-- we want to relax these checks.
if not Ignore_Rep_Clauses and not CodePeer_Mode then
Check_Expr_Constants (Expr);
end if;
end Check_Constant_Address_Clause;
---------------------------
-- Check_Pool_Size_Clash --
---------------------------
procedure Check_Pool_Size_Clash (Ent : Entity_Id; SP, SS : Node_Id) is
Post : Node_Id;
begin
-- We need to find out which one came first. Note that in the case of
-- aspects mixed with pragmas there are cases where the processing order
-- is reversed, which is why we do the check here.
if Sloc (SP) < Sloc (SS) then
Error_Msg_Sloc := Sloc (SP);
Post := SS;
Error_Msg_NE ("Storage_Pool previously given for&#", Post, Ent);
else
Error_Msg_Sloc := Sloc (SS);
Post := SP;
Error_Msg_NE ("Storage_Size previously given for&#", Post, Ent);
end if;
Error_Msg_N
("\cannot have Storage_Size and Storage_Pool (RM 13.11(3))", Post);
end Check_Pool_Size_Clash;
----------------------------------------
-- Check_Record_Representation_Clause --
----------------------------------------
procedure Check_Record_Representation_Clause (N : Node_Id) is
Loc : constant Source_Ptr := Sloc (N);
Ident : constant Node_Id := Identifier (N);
Rectype : Entity_Id;
Fent : Entity_Id;
CC : Node_Id;
Fbit : Uint;
Lbit : Uint;
Hbit : Uint := Uint_0;
Comp : Entity_Id;
Pcomp : Entity_Id;
Max_Bit_So_Far : Uint;
-- Records the maximum bit position so far. If all field positions
-- are monotonically increasing, then we can skip the circuit for
-- checking for overlap, since no overlap is possible.
Tagged_Parent : Entity_Id := Empty;
-- This is set in the case of an extension for which we have either a
-- size clause or Is_Fully_Repped_Tagged_Type True (indicating that all
-- components are positioned by record representation clauses) on the
-- parent type. In this case we check for overlap between components of
-- this tagged type and the parent component. Tagged_Parent will point
-- to this parent type. For all other cases, Tagged_Parent is Empty.
Parent_Last_Bit : Uint := No_Uint; -- init to avoid warning
-- Relevant only if Tagged_Parent is set, Parent_Last_Bit indicates the
-- last bit position for any field in the parent type. We only need to
-- check overlap for fields starting below this point.
Overlap_Check_Required : Boolean;
-- Used to keep track of whether or not an overlap check is required
Overlap_Detected : Boolean := False;
-- Set True if an overlap is detected
Ccount : Natural := 0;
-- Number of component clauses in record rep clause
procedure Check_Component_Overlap (C1_Ent, C2_Ent : Entity_Id);
-- Given two entities for record components or discriminants, checks
-- if they have overlapping component clauses and issues errors if so.
procedure Find_Component;
-- Finds component entity corresponding to current component clause (in
-- CC), and sets Comp to the entity, and Fbit/Lbit to the zero origin
-- start/stop bits for the field. If there is no matching component or
-- if the matching component does not have a component clause, then
-- that's an error and Comp is set to Empty, but no error message is
-- issued, since the message was already given. Comp is also set to
-- Empty if the current "component clause" is in fact a pragma.
-----------------------------
-- Check_Component_Overlap --
-----------------------------
procedure Check_Component_Overlap (C1_Ent, C2_Ent : Entity_Id) is
CC1 : constant Node_Id := Component_Clause (C1_Ent);
CC2 : constant Node_Id := Component_Clause (C2_Ent);
begin
if Present (CC1) and then Present (CC2) then
-- Exclude odd case where we have two tag components in the same
-- record, both at location zero. This seems a bit strange, but
-- it seems to happen in some circumstances, perhaps on an error.
if Nam_In (Chars (C1_Ent), Name_uTag, Name_uTag) then
return;
end if;
-- Here we check if the two fields overlap
declare
S1 : constant Uint := Component_Bit_Offset (C1_Ent);
S2 : constant Uint := Component_Bit_Offset (C2_Ent);
E1 : constant Uint := S1 + Esize (C1_Ent);
E2 : constant Uint := S2 + Esize (C2_Ent);
begin
if E2 <= S1 or else E1 <= S2 then
null;
else
Error_Msg_Node_2 := Component_Name (CC2);
Error_Msg_Sloc := Sloc (Error_Msg_Node_2);
Error_Msg_Node_1 := Component_Name (CC1);
Error_Msg_N
("component& overlaps & #", Component_Name (CC1));
Overlap_Detected := True;
end if;
end;
end if;
end Check_Component_Overlap;
--------------------
-- Find_Component --
--------------------
procedure Find_Component is
procedure Search_Component (R : Entity_Id);
-- Search components of R for a match. If found, Comp is set
----------------------
-- Search_Component --
----------------------
procedure Search_Component (R : Entity_Id) is
begin
Comp := First_Component_Or_Discriminant (R);
while Present (Comp) loop
-- Ignore error of attribute name for component name (we
-- already gave an error message for this, so no need to
-- complain here)
if Nkind (Component_Name (CC)) = N_Attribute_Reference then
null;
else
exit when Chars (Comp) = Chars (Component_Name (CC));
end if;
Next_Component_Or_Discriminant (Comp);
end loop;
end Search_Component;
-- Start of processing for Find_Component
begin
-- Return with Comp set to Empty if we have a pragma
if Nkind (CC) = N_Pragma then
Comp := Empty;
return;
end if;
-- Search current record for matching component
Search_Component (Rectype);
-- If not found, maybe component of base type discriminant that is
-- absent from statically constrained first subtype.
if No (Comp) then
Search_Component (Base_Type (Rectype));
end if;
-- If no component, or the component does not reference the component
-- clause in question, then there was some previous error for which
-- we already gave a message, so just return with Comp Empty.
if No (Comp) or else Component_Clause (Comp) /= CC then
Check_Error_Detected;
Comp := Empty;
-- Normal case where we have a component clause
else
Fbit := Component_Bit_Offset (Comp);
Lbit := Fbit + Esize (Comp) - 1;
end if;
end Find_Component;
-- Start of processing for Check_Record_Representation_Clause
begin
Find_Type (Ident);
Rectype := Entity (Ident);
if Rectype = Any_Type then
return;
end if;
Rectype := Underlying_Type (Rectype);
-- See if we have a fully repped derived tagged type
declare
PS : constant Entity_Id := Parent_Subtype (Rectype);
begin
if Present (PS) and then Known_Static_RM_Size (PS) then
Tagged_Parent := PS;
Parent_Last_Bit := RM_Size (PS) - 1;
elsif Present (PS) and then Is_Fully_Repped_Tagged_Type (PS) then
Tagged_Parent := PS;
-- Find maximum bit of any component of the parent type
Parent_Last_Bit := UI_From_Int (System_Address_Size - 1);
Pcomp := First_Entity (Tagged_Parent);
while Present (Pcomp) loop
if Ekind_In (Pcomp, E_Discriminant, E_Component) then
if Component_Bit_Offset (Pcomp) /= No_Uint
and then Known_Static_Esize (Pcomp)
then
Parent_Last_Bit :=
UI_Max
(Parent_Last_Bit,
Component_Bit_Offset (Pcomp) + Esize (Pcomp) - 1);
end if;
else
-- Skip anonymous types generated for constrained array
-- or record components.
null;
end if;
Next_Entity (Pcomp);
end loop;
end if;
end;
-- All done if no component clauses
CC := First (Component_Clauses (N));
if No (CC) then
return;
end if;
-- If a tag is present, then create a component clause that places it
-- at the start of the record (otherwise gigi may place it after other
-- fields that have rep clauses).
Fent := First_Entity (Rectype);
if Nkind (Fent) = N_Defining_Identifier
and then Chars (Fent) = Name_uTag
then
Set_Component_Bit_Offset (Fent, Uint_0);
Set_Normalized_Position (Fent, Uint_0);
Set_Normalized_First_Bit (Fent, Uint_0);
Set_Normalized_Position_Max (Fent, Uint_0);
Init_Esize (Fent, System_Address_Size);
Set_Component_Clause (Fent,
Make_Component_Clause (Loc,
Component_Name => Make_Identifier (Loc, Name_uTag),
Position => Make_Integer_Literal (Loc, Uint_0),
First_Bit => Make_Integer_Literal (Loc, Uint_0),
Last_Bit =>
Make_Integer_Literal (Loc,
UI_From_Int (System_Address_Size))));
Ccount := Ccount + 1;
end if;
Max_Bit_So_Far := Uint_Minus_1;
Overlap_Check_Required := False;
-- Process the component clauses
while Present (CC) loop
Find_Component;
if Present (Comp) then
Ccount := Ccount + 1;
-- We need a full overlap check if record positions non-monotonic
if Fbit <= Max_Bit_So_Far then
Overlap_Check_Required := True;
end if;
Max_Bit_So_Far := Lbit;
-- Check bit position out of range of specified size
if Has_Size_Clause (Rectype)
and then RM_Size (Rectype) <= Lbit
then
Error_Msg_N
("bit number out of range of specified size",
Last_Bit (CC));
-- Check for overlap with tag or parent component
else
if Is_Tagged_Type (Rectype)
and then Fbit < System_Address_Size
then
Error_Msg_NE
("component overlaps tag field of&",
Component_Name (CC), Rectype);
Overlap_Detected := True;
elsif Present (Tagged_Parent)
and then Fbit <= Parent_Last_Bit
then
Error_Msg_NE
("component overlaps parent field of&",
Component_Name (CC), Rectype);
Overlap_Detected := True;
end if;
if Hbit < Lbit then
Hbit := Lbit;
end if;
end if;
end if;
Next (CC);
end loop;
-- Now that we have processed all the component clauses, check for
-- overlap. We have to leave this till last, since the components can
-- appear in any arbitrary order in the representation clause.
-- We do not need this check if all specified ranges were monotonic,
-- as recorded by Overlap_Check_Required being False at this stage.
-- This first section checks if there are any overlapping entries at
-- all. It does this by sorting all entries and then seeing if there are
-- any overlaps. If there are none, then that is decisive, but if there
-- are overlaps, they may still be OK (they may result from fields in
-- different variants).
if Overlap_Check_Required then
Overlap_Check1 : declare
OC_Fbit : array (0 .. Ccount) of Uint;
-- First-bit values for component clauses, the value is the offset
-- of the first bit of the field from start of record. The zero
-- entry is for use in sorting.
OC_Lbit : array (0 .. Ccount) of Uint;
-- Last-bit values for component clauses, the value is the offset
-- of the last bit of the field from start of record. The zero
-- entry is for use in sorting.
OC_Count : Natural := 0;
-- Count of entries in OC_Fbit and OC_Lbit
function OC_Lt (Op1, Op2 : Natural) return Boolean;
-- Compare routine for Sort
procedure OC_Move (From : Natural; To : Natural);
-- Move routine for Sort
package Sorting is new GNAT.Heap_Sort_G (OC_Move, OC_Lt);
-----------
-- OC_Lt --
-----------
function OC_Lt (Op1, Op2 : Natural) return Boolean is
begin
return OC_Fbit (Op1) < OC_Fbit (Op2);
end OC_Lt;
-------------
-- OC_Move --
-------------
procedure OC_Move (From : Natural; To : Natural) is
begin
OC_Fbit (To) := OC_Fbit (From);
OC_Lbit (To) := OC_Lbit (From);
end OC_Move;
-- Start of processing for Overlap_Check
begin
CC := First (Component_Clauses (N));
while Present (CC) loop
-- Exclude component clause already marked in error
if not Error_Posted (CC) then
Find_Component;
if Present (Comp) then
OC_Count := OC_Count + 1;
OC_Fbit (OC_Count) := Fbit;
OC_Lbit (OC_Count) := Lbit;
end if;
end if;
Next (CC);
end loop;
Sorting.Sort (OC_Count);
Overlap_Check_Required := False;
for J in 1 .. OC_Count - 1 loop
if OC_Lbit (J) >= OC_Fbit (J + 1) then
Overlap_Check_Required := True;
exit;
end if;
end loop;
end Overlap_Check1;
end if;
-- If Overlap_Check_Required is still True, then we have to do the full
-- scale overlap check, since we have at least two fields that do
-- overlap, and we need to know if that is OK since they are in
-- different variant, or whether we have a definite problem.
if Overlap_Check_Required then
Overlap_Check2 : declare
C1_Ent, C2_Ent : Entity_Id;
-- Entities of components being checked for overlap
Clist : Node_Id;
-- Component_List node whose Component_Items are being checked
Citem : Node_Id;
-- Component declaration for component being checked
begin
C1_Ent := First_Entity (Base_Type (Rectype));
-- Loop through all components in record. For each component check
-- for overlap with any of the preceding elements on the component
-- list containing the component and also, if the component is in
-- a variant, check against components outside the case structure.
-- This latter test is repeated recursively up the variant tree.
Main_Component_Loop : while Present (C1_Ent) loop
if not Ekind_In (C1_Ent, E_Component, E_Discriminant) then
goto Continue_Main_Component_Loop;
end if;
-- Skip overlap check if entity has no declaration node. This
-- happens with discriminants in constrained derived types.
-- Possibly we are missing some checks as a result, but that
-- does not seem terribly serious.
if No (Declaration_Node (C1_Ent)) then
goto Continue_Main_Component_Loop;
end if;
Clist := Parent (List_Containing (Declaration_Node (C1_Ent)));
-- Loop through component lists that need checking. Check the
-- current component list and all lists in variants above us.
Component_List_Loop : loop
-- If derived type definition, go to full declaration
-- If at outer level, check discriminants if there are any.
if Nkind (Clist) = N_Derived_Type_Definition then
Clist := Parent (Clist);
end if;
-- Outer level of record definition, check discriminants
if Nkind_In (Clist, N_Full_Type_Declaration,
N_Private_Type_Declaration)
then
if Has_Discriminants (Defining_Identifier (Clist)) then
C2_Ent :=
First_Discriminant (Defining_Identifier (Clist));
while Present (C2_Ent) loop
exit when C1_Ent = C2_Ent;
Check_Component_Overlap (C1_Ent, C2_Ent);
Next_Discriminant (C2_Ent);
end loop;
end if;
-- Record extension case
elsif Nkind (Clist) = N_Derived_Type_Definition then
Clist := Empty;
-- Otherwise check one component list
else
Citem := First (Component_Items (Clist));
while Present (Citem) loop
if Nkind (Citem) = N_Component_Declaration then
C2_Ent := Defining_Identifier (Citem);
exit when C1_Ent = C2_Ent;
Check_Component_Overlap (C1_Ent, C2_Ent);
end if;
Next (Citem);
end loop;
end if;
-- Check for variants above us (the parent of the Clist can
-- be a variant, in which case its parent is a variant part,
-- and the parent of the variant part is a component list
-- whose components must all be checked against the current
-- component for overlap).
if Nkind (Parent (Clist)) = N_Variant then
Clist := Parent (Parent (Parent (Clist)));
-- Check for possible discriminant part in record, this
-- is treated essentially as another level in the
-- recursion. For this case the parent of the component
-- list is the record definition, and its parent is the
-- full type declaration containing the discriminant
-- specifications.
elsif Nkind (Parent (Clist)) = N_Record_Definition then
Clist := Parent (Parent ((Clist)));
-- If neither of these two cases, we are at the top of
-- the tree.
else
exit Component_List_Loop;
end if;
end loop Component_List_Loop;
<<Continue_Main_Component_Loop>>
Next_Entity (C1_Ent);
end loop Main_Component_Loop;
end Overlap_Check2;
end if;
-- The following circuit deals with warning on record holes (gaps). We
-- skip this check if overlap was detected, since it makes sense for the
-- programmer to fix this illegality before worrying about warnings.
if not Overlap_Detected and Warn_On_Record_Holes then
Record_Hole_Check : declare
Decl : constant Node_Id := Declaration_Node (Base_Type (Rectype));
-- Full declaration of record type
procedure Check_Component_List
(CL : Node_Id;
Sbit : Uint;
DS : List_Id);
-- Check component list CL for holes. The starting bit should be
-- Sbit. which is zero for the main record component list and set
-- appropriately for recursive calls for variants. DS is set to
-- a list of discriminant specifications to be included in the
-- consideration of components. It is No_List if none to consider.
--------------------------
-- Check_Component_List --
--------------------------
procedure Check_Component_List
(CL : Node_Id;
Sbit : Uint;
DS : List_Id)
is
Compl : Integer;
begin
Compl := Integer (List_Length (Component_Items (CL)));
if DS /= No_List then
Compl := Compl + Integer (List_Length (DS));
end if;
declare
Comps : array (Natural range 0 .. Compl) of Entity_Id;
-- Gather components (zero entry is for sort routine)
Ncomps : Natural := 0;
-- Number of entries stored in Comps (starting at Comps (1))
Citem : Node_Id;
-- One component item or discriminant specification
Nbit : Uint;
-- Starting bit for next component
CEnt : Entity_Id;
-- Component entity
Variant : Node_Id;
-- One variant
function Lt (Op1, Op2 : Natural) return Boolean;
-- Compare routine for Sort
procedure Move (From : Natural; To : Natural);
-- Move routine for Sort
package Sorting is new GNAT.Heap_Sort_G (Move, Lt);
--------
-- Lt --
--------
function Lt (Op1, Op2 : Natural) return Boolean is
begin
return Component_Bit_Offset (Comps (Op1))
<
Component_Bit_Offset (Comps (Op2));
end Lt;
----------
-- Move --
----------
procedure Move (From : Natural; To : Natural) is
begin
Comps (To) := Comps (From);
end Move;
begin
-- Gather discriminants into Comp
if DS /= No_List then
Citem := First (DS);
while Present (Citem) loop
if Nkind (Citem) = N_Discriminant_Specification then
declare
Ent : constant Entity_Id :=
Defining_Identifier (Citem);
begin
if Ekind (Ent) = E_Discriminant then
Ncomps := Ncomps + 1;
Comps (Ncomps) := Ent;
end if;
end;
end if;
Next (Citem);
end loop;
end if;
-- Gather component entities into Comp
Citem := First (Component_Items (CL));
while Present (Citem) loop
if Nkind (Citem) = N_Component_Declaration then
Ncomps := Ncomps + 1;
Comps (Ncomps) := Defining_Identifier (Citem);
end if;
Next (Citem);
end loop;
-- Now sort the component entities based on the first bit.
-- Note we already know there are no overlapping components.
Sorting.Sort (Ncomps);
-- Loop through entries checking for holes
Nbit := Sbit;
for J in 1 .. Ncomps loop
CEnt := Comps (J);
declare
CBO : constant Uint := Component_Bit_Offset (CEnt);
begin
-- Skip components with unknown offsets
if CBO /= No_Uint and then CBO >= 0 then
Error_Msg_Uint_1 := CBO - Nbit;
if Error_Msg_Uint_1 > 0 then
Error_Msg_NE
("?H?^-bit gap before component&",
Component_Name (Component_Clause (CEnt)),
CEnt);
end if;
Nbit := CBO + Esize (CEnt);
end if;
end;
end loop;
-- Process variant parts recursively if present
if Present (Variant_Part (CL)) then
Variant := First (Variants (Variant_Part (CL)));
while Present (Variant) loop
Check_Component_List
(Component_List (Variant), Nbit, No_List);
Next (Variant);
end loop;
end if;
end;
end Check_Component_List;
-- Start of processing for Record_Hole_Check
begin
declare
Sbit : Uint;
begin
if Is_Tagged_Type (Rectype) then
Sbit := UI_From_Int (System_Address_Size);
else
Sbit := Uint_0;
end if;
if Nkind (Decl) = N_Full_Type_Declaration
and then Nkind (Type_Definition (Decl)) = N_Record_Definition
then
Check_Component_List
(Component_List (Type_Definition (Decl)),
Sbit,
Discriminant_Specifications (Decl));
end if;
end;
end Record_Hole_Check;
end if;
-- For records that have component clauses for all components, and whose
-- size is less than or equal to 32, we need to know the size in the
-- front end to activate possible packed array processing where the
-- component type is a record.
-- At this stage Hbit + 1 represents the first unused bit from all the
-- component clauses processed, so if the component clauses are
-- complete, then this is the length of the record.
-- For records longer than System.Storage_Unit, and for those where not
-- all components have component clauses, the back end determines the
-- length (it may for example be appropriate to round up the size
-- to some convenient boundary, based on alignment considerations, etc).
if Unknown_RM_Size (Rectype) and then Hbit + 1 <= 32 then
-- Nothing to do if at least one component has no component clause
Comp := First_Component_Or_Discriminant (Rectype);
while Present (Comp) loop
exit when No (Component_Clause (Comp));
Next_Component_Or_Discriminant (Comp);
end loop;
-- If we fall out of loop, all components have component clauses
-- and so we can set the size to the maximum value.
if No (Comp) then
Set_RM_Size (Rectype, Hbit + 1);
end if;
end if;
end Check_Record_Representation_Clause;
----------------
-- Check_Size --
----------------
procedure Check_Size
(N : Node_Id;
T : Entity_Id;
Siz : Uint;
Biased : out Boolean)
is
procedure Size_Too_Small_Error (Min_Siz : Uint);
-- Emit an error concerning illegal size Siz. Min_Siz denotes the
-- minimum size.
--------------------------
-- Size_Too_Small_Error --
--------------------------
procedure Size_Too_Small_Error (Min_Siz : Uint) is
begin
-- This error is suppressed in ASIS mode to allow for different ASIS
-- back ends or ASIS-based tools to query the illegal clause.
if not ASIS_Mode then
Error_Msg_Uint_1 := Min_Siz;
Error_Msg_NE ("size for& too small, minimum allowed is ^", N, T);
end if;
end Size_Too_Small_Error;
-- Local variables
UT : constant Entity_Id := Underlying_Type (T);
M : Uint;
-- Start of processing for Check_Size
begin
Biased := False;
-- Reject patently improper size values
if Is_Elementary_Type (T)
and then Siz > UI_From_Int (Int'Last)
then
Error_Msg_N ("Size value too large for elementary type", N);
if Nkind (Original_Node (N)) = N_Op_Expon then
Error_Msg_N
("\maybe '* was meant, rather than '*'*", Original_Node (N));
end if;
end if;
-- Dismiss generic types
if Is_Generic_Type (T)
or else
Is_Generic_Type (UT)
or else
Is_Generic_Type (Root_Type (UT))
then
return;
-- Guard against previous errors
elsif No (UT) or else UT = Any_Type then
Check_Error_Detected;
return;
-- Check case of bit packed array
elsif Is_Array_Type (UT)
and then Known_Static_Component_Size (UT)
and then Is_Bit_Packed_Array (UT)
then
declare
Asiz : Uint;
Indx : Node_Id;
Ityp : Entity_Id;
begin
Asiz := Component_Size (UT);
Indx := First_Index (UT);
loop
Ityp := Etype (Indx);
-- If non-static bound, then we are not in the business of
-- trying to check the length, and indeed an error will be
-- issued elsewhere, since sizes of non-static array types
-- cannot be set implicitly or explicitly.
if not Is_OK_Static_Subtype (Ityp) then
return;
end if;
-- Otherwise accumulate next dimension
Asiz := Asiz * (Expr_Value (Type_High_Bound (Ityp)) -
Expr_Value (Type_Low_Bound (Ityp)) +
Uint_1);
Next_Index (Indx);
exit when No (Indx);
end loop;
if Asiz <= Siz then
return;
else
Size_Too_Small_Error (Asiz);
Set_Esize (T, Asiz);
Set_RM_Size (T, Asiz);
end if;
end;
-- All other composite types are ignored
elsif Is_Composite_Type (UT) then
return;
-- For fixed-point types, don't check minimum if type is not frozen,
-- since we don't know all the characteristics of the type that can
-- affect the size (e.g. a specified small) till freeze time.
elsif Is_Fixed_Point_Type (UT) and then not Is_Frozen (UT) then
null;
-- Cases for which a minimum check is required
else
-- Ignore if specified size is correct for the type
if Known_Esize (UT) and then Siz = Esize (UT) then
return;
end if;
-- Otherwise get minimum size
M := UI_From_Int (Minimum_Size (UT));
if Siz < M then
-- Size is less than minimum size, but one possibility remains
-- that we can manage with the new size if we bias the type.
M := UI_From_Int (Minimum_Size (UT, Biased => True));
if Siz < M then
Size_Too_Small_Error (M);
Set_Esize (T, M);
Set_RM_Size (T, M);
else
Biased := True;
end if;
end if;
end if;
end Check_Size;
--------------------------
-- Freeze_Entity_Checks --
--------------------------
procedure Freeze_Entity_Checks (N : Node_Id) is
procedure Hide_Non_Overridden_Subprograms (Typ : Entity_Id);
-- Inspect the primitive operations of type Typ and hide all pairs of
-- implicitly declared non-overridden non-fully conformant homographs
-- (Ada RM 8.3 12.3/2).
-------------------------------------
-- Hide_Non_Overridden_Subprograms --
-------------------------------------
procedure Hide_Non_Overridden_Subprograms (Typ : Entity_Id) is
procedure Hide_Matching_Homographs
(Subp_Id : Entity_Id;
Start_Elmt : Elmt_Id);
-- Inspect a list of primitive operations starting with Start_Elmt
-- and find matching implicitly declared non-overridden non-fully
-- conformant homographs of Subp_Id. If found, all matches along
-- with Subp_Id are hidden from all visibility.
function Is_Non_Overridden_Or_Null_Procedure
(Subp_Id : Entity_Id) return Boolean;
-- Determine whether subprogram Subp_Id is implicitly declared non-
-- overridden subprogram or an implicitly declared null procedure.
------------------------------
-- Hide_Matching_Homographs --
------------------------------
procedure Hide_Matching_Homographs
(Subp_Id : Entity_Id;
Start_Elmt : Elmt_Id)
is
Prim : Entity_Id;
Prim_Elmt : Elmt_Id;
begin
Prim_Elmt := Start_Elmt;
while Present (Prim_Elmt) loop
Prim := Node (Prim_Elmt);
-- The current primitive is implicitly declared non-overridden
-- non-fully conformant homograph of Subp_Id. Both subprograms
-- must be hidden from visibility.
if Chars (Prim) = Chars (Subp_Id)
and then Is_Non_Overridden_Or_Null_Procedure (Prim)
and then not Fully_Conformant (Prim, Subp_Id)
then
Set_Is_Hidden_Non_Overridden_Subpgm (Prim);
Set_Is_Immediately_Visible (Prim, False);
Set_Is_Potentially_Use_Visible (Prim, False);
Set_Is_Hidden_Non_Overridden_Subpgm (Subp_Id);
Set_Is_Immediately_Visible (Subp_Id, False);
Set_Is_Potentially_Use_Visible (Subp_Id, False);
end if;
Next_Elmt (Prim_Elmt);
end loop;
end Hide_Matching_Homographs;
-----------------------------------------
-- Is_Non_Overridden_Or_Null_Procedure --
-----------------------------------------
function Is_Non_Overridden_Or_Null_Procedure
(Subp_Id : Entity_Id) return Boolean
is
Alias_Id : Entity_Id;
begin
-- The subprogram is inherited (implicitly declared), it does not
-- override and does not cover a primitive of an interface.
if Ekind_In (Subp_Id, E_Function, E_Procedure)
and then Present (Alias (Subp_Id))
and then No (Interface_Alias (Subp_Id))
and then No (Overridden_Operation (Subp_Id))
then
Alias_Id := Alias (Subp_Id);
if Requires_Overriding (Alias_Id) then
return True;
elsif Nkind (Parent (Alias_Id)) = N_Procedure_Specification
and then Null_Present (Parent (Alias_Id))
then
return True;
end if;
end if;
return False;
end Is_Non_Overridden_Or_Null_Procedure;
-- Local variables
Prim_Ops : constant Elist_Id := Direct_Primitive_Operations (Typ);
Prim : Entity_Id;
Prim_Elmt : Elmt_Id;
-- Start of processing for Hide_Non_Overridden_Subprograms
begin
-- Inspect the list of primitives looking for non-overridden
-- subprograms.
if Present (Prim_Ops) then
Prim_Elmt := First_Elmt (Prim_Ops);
while Present (Prim_Elmt) loop
Prim := Node (Prim_Elmt);
Next_Elmt (Prim_Elmt);
if Is_Non_Overridden_Or_Null_Procedure (Prim) then
Hide_Matching_Homographs
(Subp_Id => Prim,
Start_Elmt => Prim_Elmt);
end if;
end loop;
end if;
end Hide_Non_Overridden_Subprograms;
-- Local variables
E : constant Entity_Id := Entity (N);
Nongeneric_Case : constant Boolean := Nkind (N) = N_Freeze_Entity;
-- True in nongeneric case. Some of the processing here is skipped
-- for the generic case since it is not needed. Basically in the
-- generic case, we only need to do stuff that might generate error
-- messages or warnings.
-- Start of processing for Freeze_Entity_Checks
begin
-- Remember that we are processing a freezing entity. Required to
-- ensure correct decoration of internal entities associated with
-- interfaces (see New_Overloaded_Entity).
Inside_Freezing_Actions := Inside_Freezing_Actions + 1;
-- For tagged types covering interfaces add internal entities that link
-- the primitives of the interfaces with the primitives that cover them.
-- Note: These entities were originally generated only when generating
-- code because their main purpose was to provide support to initialize
-- the secondary dispatch tables. They are now generated also when
-- compiling with no code generation to provide ASIS the relationship
-- between interface primitives and tagged type primitives. They are
-- also used to locate primitives covering interfaces when processing
-- generics (see Derive_Subprograms).
-- This is not needed in the generic case
if Ada_Version >= Ada_2005
and then Nongeneric_Case
and then Ekind (E) = E_Record_Type
and then Is_Tagged_Type (E)
and then not Is_Interface (E)
and then Has_Interfaces (E)
then
-- This would be a good common place to call the routine that checks
-- overriding of interface primitives (and thus factorize calls to
-- Check_Abstract_Overriding located at different contexts in the
-- compiler). However, this is not possible because it causes
-- spurious errors in case of late overriding.
Add_Internal_Interface_Entities (E);
end if;
-- After all forms of overriding have been resolved, a tagged type may
-- be left with a set of implicitly declared and possibly erroneous
-- abstract subprograms, null procedures and subprograms that require
-- overriding. If this set contains fully conformant homographs, then
-- one is chosen arbitrarily (already done during resolution), otherwise
-- all remaining non-fully conformant homographs are hidden from
-- visibility (Ada RM 8.3 12.3/2).
if Is_Tagged_Type (E) then
Hide_Non_Overridden_Subprograms (E);
end if;
-- Check CPP types
if Ekind (E) = E_Record_Type
and then Is_CPP_Class (E)
and then Is_Tagged_Type (E)
and then Tagged_Type_Expansion
then
if CPP_Num_Prims (E) = 0 then
-- If the CPP type has user defined components then it must import
-- primitives from C++. This is required because if the C++ class
-- has no primitives then the C++ compiler does not added the _tag
-- component to the type.
if First_Entity (E) /= Last_Entity (E) then
Error_Msg_N
("'C'P'P type must import at least one primitive from C++??",
E);
end if;
end if;
-- Check that all its primitives are abstract or imported from C++.
-- Check also availability of the C++ constructor.
declare
Has_Constructors : constant Boolean := Has_CPP_Constructors (E);
Elmt : Elmt_Id;
Error_Reported : Boolean := False;
Prim : Node_Id;
begin
Elmt := First_Elmt (Primitive_Operations (E));
while Present (Elmt) loop
Prim := Node (Elmt);
if Comes_From_Source (Prim) then
if Is_Abstract_Subprogram (Prim) then
null;
elsif not Is_Imported (Prim)
or else Convention (Prim) /= Convention_CPP
then
Error_Msg_N
("primitives of 'C'P'P types must be imported from C++ "
& "or abstract??", Prim);
elsif not Has_Constructors
and then not Error_Reported
then
Error_Msg_Name_1 := Chars (E);
Error_Msg_N
("??'C'P'P constructor required for type %", Prim);
Error_Reported := True;
end if;
end if;
Next_Elmt (Elmt);
end loop;
end;
end if;
-- Check Ada derivation of CPP type
if Expander_Active -- why? losing errors in -gnatc mode???
and then Present (Etype (E)) -- defend against errors
and then Tagged_Type_Expansion
and then Ekind (E) = E_Record_Type
and then Etype (E) /= E
and then Is_CPP_Class (Etype (E))
and then CPP_Num_Prims (Etype (E)) > 0
and then not Is_CPP_Class (E)
and then not Has_CPP_Constructors (Etype (E))
then
-- If the parent has C++ primitives but it has no constructor then
-- check that all the primitives are overridden in this derivation;
-- otherwise the constructor of the parent is needed to build the
-- dispatch table.
declare
Elmt : Elmt_Id;
Prim : Node_Id;
begin
Elmt := First_Elmt (Primitive_Operations (E));
while Present (Elmt) loop
Prim := Node (Elmt);
if not Is_Abstract_Subprogram (Prim)
and then No (Interface_Alias (Prim))
and then Find_Dispatching_Type (Ultimate_Alias (Prim)) /= E
then
Error_Msg_Name_1 := Chars (Etype (E));
Error_Msg_N
("'C'P'P constructor required for parent type %", E);
exit;
end if;
Next_Elmt (Elmt);
end loop;
end;
end if;
Inside_Freezing_Actions := Inside_Freezing_Actions - 1;
-- If we have a type with predicates, build predicate function. This is
-- not needed in the generic case, nor within TSS subprograms and other
-- predefined primitives.
if Is_Type (E)
and then Nongeneric_Case
and then not Within_Internal_Subprogram
and then Has_Predicates (E)
then
Build_Predicate_Functions (E, N);
end if;
-- If type has delayed aspects, this is where we do the preanalysis at
-- the freeze point, as part of the consistent visibility check. Note
-- that this must be done after calling Build_Predicate_Functions or
-- Build_Invariant_Procedure since these subprograms fix occurrences of
-- the subtype name in the saved expression so that they will not cause
-- trouble in the preanalysis.
-- This is also not needed in the generic case
if Nongeneric_Case
and then Has_Delayed_Aspects (E)
and then Scope (E) = Current_Scope
then
-- Retrieve the visibility to the discriminants in order to properly
-- analyze the aspects.
Push_Scope_And_Install_Discriminants (E);
declare
Ritem : Node_Id;
begin
-- Look for aspect specification entries for this entity
Ritem := First_Rep_Item (E);
while Present (Ritem) loop
if Nkind (Ritem) = N_Aspect_Specification
and then Entity (Ritem) = E
and then Is_Delayed_Aspect (Ritem)
then
Check_Aspect_At_Freeze_Point (Ritem);
end if;
Next_Rep_Item (Ritem);
end loop;
end;
Uninstall_Discriminants_And_Pop_Scope (E);
end if;
-- For a record type, deal with variant parts. This has to be delayed
-- to this point, because of the issue of statically predicated
-- subtypes, which we have to ensure are frozen before checking
-- choices, since we need to have the static choice list set.
if Is_Record_Type (E) then
Check_Variant_Part : declare
D : constant Node_Id := Declaration_Node (E);
T : Node_Id;
C : Node_Id;
VP : Node_Id;
Others_Present : Boolean;
pragma Warnings (Off, Others_Present);
-- Indicates others present, not used in this case
procedure Non_Static_Choice_Error (Choice : Node_Id);
-- Error routine invoked by the generic instantiation below when
-- the variant part has a non static choice.
procedure Process_Declarations (Variant : Node_Id);
-- Processes declarations associated with a variant. We analyzed
-- the declarations earlier (in Sem_Ch3.Analyze_Variant_Part),
-- but we still need the recursive call to Check_Choices for any
-- nested variant to get its choices properly processed. This is
-- also where we expand out the choices if expansion is active.
package Variant_Choices_Processing is new
Generic_Check_Choices
(Process_Empty_Choice => No_OP,
Process_Non_Static_Choice => Non_Static_Choice_Error,
Process_Associated_Node => Process_Declarations);
use Variant_Choices_Processing;
-----------------------------
-- Non_Static_Choice_Error --
-----------------------------
procedure Non_Static_Choice_Error (Choice : Node_Id) is
begin
Flag_Non_Static_Expr
("choice given in variant part is not static!", Choice);
end Non_Static_Choice_Error;
--------------------------
-- Process_Declarations --
--------------------------
procedure Process_Declarations (Variant : Node_Id) is
CL : constant Node_Id := Component_List (Variant);
VP : Node_Id;
begin
-- Check for static predicate present in this variant
if Has_SP_Choice (Variant) then
-- Here we expand. You might expect to find this call in
-- Expand_N_Variant_Part, but that is called when we first
-- see the variant part, and we cannot do this expansion
-- earlier than the freeze point, since for statically
-- predicated subtypes, the predicate is not known till
-- the freeze point.
-- Furthermore, we do this expansion even if the expander
-- is not active, because other semantic processing, e.g.
-- for aggregates, requires the expanded list of choices.
-- If the expander is not active, then we can't just clobber
-- the list since it would invalidate the ASIS -gnatct tree.
-- So we have to rewrite the variant part with a Rewrite
-- call that replaces it with a copy and clobber the copy.
if not Expander_Active then
declare
NewV : constant Node_Id := New_Copy (Variant);
begin
Set_Discrete_Choices
(NewV, New_Copy_List (Discrete_Choices (Variant)));
Rewrite (Variant, NewV);
end;
end if;
Expand_Static_Predicates_In_Choices (Variant);
end if;
-- We don't need to worry about the declarations in the variant
-- (since they were analyzed by Analyze_Choices when we first
-- encountered the variant), but we do need to take care of
-- expansion of any nested variants.
if not Null_Present (CL) then
VP := Variant_Part (CL);
if Present (VP) then
Check_Choices
(VP, Variants (VP), Etype (Name (VP)), Others_Present);
end if;
end if;
end Process_Declarations;
-- Start of processing for Check_Variant_Part
begin
-- Find component list
C := Empty;
if Nkind (D) = N_Full_Type_Declaration then
T := Type_Definition (D);
if Nkind (T) = N_Record_Definition then
C := Component_List (T);
elsif Nkind (T) = N_Derived_Type_Definition
and then Present (Record_Extension_Part (T))
then
C := Component_List (Record_Extension_Part (T));
end if;
end if;
-- Case of variant part present
if Present (C) and then Present (Variant_Part (C)) then
VP := Variant_Part (C);
-- Check choices
Check_Choices
(VP, Variants (VP), Etype (Name (VP)), Others_Present);
-- If the last variant does not contain the Others choice,
-- replace it with an N_Others_Choice node since Gigi always
-- wants an Others. Note that we do not bother to call Analyze
-- on the modified variant part, since its only effect would be
-- to compute the Others_Discrete_Choices node laboriously, and
-- of course we already know the list of choices corresponding
-- to the others choice (it's the list we're replacing).
-- We only want to do this if the expander is active, since
-- we do not want to clobber the ASIS tree.
if Expander_Active then
declare
Last_Var : constant Node_Id :=
Last_Non_Pragma (Variants (VP));
Others_Node : Node_Id;
begin
if Nkind (First (Discrete_Choices (Last_Var))) /=
N_Others_Choice
then
Others_Node := Make_Others_Choice (Sloc (Last_Var));
Set_Others_Discrete_Choices
(Others_Node, Discrete_Choices (Last_Var));
Set_Discrete_Choices
(Last_Var, New_List (Others_Node));
end if;
end;
end if;
end if;
end Check_Variant_Part;
end if;
end Freeze_Entity_Checks;
-------------------------
-- Get_Alignment_Value --
-------------------------
function Get_Alignment_Value (Expr : Node_Id) return Uint is
Align : constant Uint := Static_Integer (Expr);
begin
if Align = No_Uint then
return No_Uint;
elsif Align <= 0 then
-- This error is suppressed in ASIS mode to allow for different ASIS
-- back ends or ASIS-based tools to query the illegal clause.
if not ASIS_Mode then
Error_Msg_N ("alignment value must be positive", Expr);
end if;
return No_Uint;
else
for J in Int range 0 .. 64 loop
declare
M : constant Uint := Uint_2 ** J;
begin
exit when M = Align;
if M > Align then
-- This error is suppressed in ASIS mode to allow for
-- different ASIS back ends or ASIS-based tools to query the
-- illegal clause.
if not ASIS_Mode then
Error_Msg_N ("alignment value must be power of 2", Expr);
end if;
return No_Uint;
end if;
end;
end loop;
return Align;
end if;
end Get_Alignment_Value;
-------------------------------------
-- Inherit_Aspects_At_Freeze_Point --
-------------------------------------
procedure Inherit_Aspects_At_Freeze_Point (Typ : Entity_Id) is
function Is_Pragma_Or_Corr_Pragma_Present_In_Rep_Item
(Rep_Item : Node_Id) return Boolean;
-- This routine checks if Rep_Item is either a pragma or an aspect
-- specification node whose correponding pragma (if any) is present in
-- the Rep Item chain of the entity it has been specified to.
--------------------------------------------------
-- Is_Pragma_Or_Corr_Pragma_Present_In_Rep_Item --
--------------------------------------------------
function Is_Pragma_Or_Corr_Pragma_Present_In_Rep_Item
(Rep_Item : Node_Id) return Boolean
is
begin
return
Nkind (Rep_Item) = N_Pragma
or else Present_In_Rep_Item
(Entity (Rep_Item), Aspect_Rep_Item (Rep_Item));
end Is_Pragma_Or_Corr_Pragma_Present_In_Rep_Item;
-- Start of processing for Inherit_Aspects_At_Freeze_Point
begin
-- A representation item is either subtype-specific (Size and Alignment
-- clauses) or type-related (all others). Subtype-specific aspects may
-- differ for different subtypes of the same type (RM 13.1.8).
-- A derived type inherits each type-related representation aspect of
-- its parent type that was directly specified before the declaration of
-- the derived type (RM 13.1.15).
-- A derived subtype inherits each subtype-specific representation
-- aspect of its parent subtype that was directly specified before the
-- declaration of the derived type (RM 13.1.15).
-- The general processing involves inheriting a representation aspect
-- from a parent type whenever the first rep item (aspect specification,
-- attribute definition clause, pragma) corresponding to the given
-- representation aspect in the rep item chain of Typ, if any, isn't
-- directly specified to Typ but to one of its parents.
-- ??? Note that, for now, just a limited number of representation
-- aspects have been inherited here so far. Many of them are
-- still inherited in Sem_Ch3. This will be fixed soon. Here is
-- a non- exhaustive list of aspects that likely also need to
-- be moved to this routine: Alignment, Component_Alignment,
-- Component_Size, Machine_Radix, Object_Size, Pack, Predicates,
-- Preelaborable_Initialization, RM_Size and Small.
-- In addition, Convention must be propagated from base type to subtype,
-- because the subtype may have been declared on an incomplete view.
if Nkind (Parent (Typ)) = N_Private_Extension_Declaration then
return;
end if;
-- Ada_05/Ada_2005
if not Has_Rep_Item (Typ, Name_Ada_05, Name_Ada_2005, False)
and then Has_Rep_Item (Typ, Name_Ada_05, Name_Ada_2005)
and then Is_Pragma_Or_Corr_Pragma_Present_In_Rep_Item
(Get_Rep_Item (Typ, Name_Ada_05, Name_Ada_2005))
then
Set_Is_Ada_2005_Only (Typ);
end if;
-- Ada_12/Ada_2012
if not Has_Rep_Item (Typ, Name_Ada_12, Name_Ada_2012, False)
and then Has_Rep_Item (Typ, Name_Ada_12, Name_Ada_2012)
and then Is_Pragma_Or_Corr_Pragma_Present_In_Rep_Item
(Get_Rep_Item (Typ, Name_Ada_12, Name_Ada_2012))
then
Set_Is_Ada_2012_Only (Typ);
end if;
-- Atomic/Shared
if not Has_Rep_Item (Typ, Name_Atomic, Name_Shared, False)
and then Has_Rep_Pragma (Typ, Name_Atomic, Name_Shared)
and then Is_Pragma_Or_Corr_Pragma_Present_In_Rep_Item
(Get_Rep_Item (Typ, Name_Atomic, Name_Shared))
then
Set_Is_Atomic (Typ);
Set_Is_Volatile (Typ);
Set_Treat_As_Volatile (Typ);
end if;
-- Convention
if Is_Record_Type (Typ)
and then Typ /= Base_Type (Typ) and then Is_Frozen (Base_Type (Typ))
then
Set_Convention (Typ, Convention (Base_Type (Typ)));
end if;
-- Default_Component_Value
-- Verify that there is no rep_item declared for the type, and there
-- is one coming from an ancestor.
if Is_Array_Type (Typ)
and then Is_Base_Type (Typ)
and then not Has_Rep_Item (Typ, Name_Default_Component_Value, False)
and then Has_Rep_Item (Typ, Name_Default_Component_Value)
then
Set_Default_Aspect_Component_Value (Typ,
Default_Aspect_Component_Value
(Entity (Get_Rep_Item (Typ, Name_Default_Component_Value))));
end if;
-- Default_Value
if Is_Scalar_Type (Typ)
and then Is_Base_Type (Typ)
and then not Has_Rep_Item (Typ, Name_Default_Value, False)
and then Has_Rep_Item (Typ, Name_Default_Value)
then
Set_Has_Default_Aspect (Typ);
Set_Default_Aspect_Value (Typ,
Default_Aspect_Value
(Entity (Get_Rep_Item (Typ, Name_Default_Value))));
end if;
-- Discard_Names
if not Has_Rep_Item (Typ, Name_Discard_Names, False)
and then Has_Rep_Item (Typ, Name_Discard_Names)
and then Is_Pragma_Or_Corr_Pragma_Present_In_Rep_Item
(Get_Rep_Item (Typ, Name_Discard_Names))
then
Set_Discard_Names (Typ);
end if;
-- Volatile
if not Has_Rep_Item (Typ, Name_Volatile, False)
and then Has_Rep_Item (Typ, Name_Volatile)
and then Is_Pragma_Or_Corr_Pragma_Present_In_Rep_Item
(Get_Rep_Item (Typ, Name_Volatile))
then
Set_Is_Volatile (Typ);
Set_Treat_As_Volatile (Typ);
end if;
-- Volatile_Full_Access
if not Has_Rep_Item (Typ, Name_Volatile_Full_Access, False)
and then Has_Rep_Pragma (Typ, Name_Volatile_Full_Access)
and then Is_Pragma_Or_Corr_Pragma_Present_In_Rep_Item
(Get_Rep_Item (Typ, Name_Volatile_Full_Access))
then
Set_Is_Volatile_Full_Access (Typ);
Set_Is_Volatile (Typ);
Set_Treat_As_Volatile (Typ);
end if;
-- Inheritance for derived types only
if Is_Derived_Type (Typ) then
declare
Bas_Typ : constant Entity_Id := Base_Type (Typ);
Imp_Bas_Typ : constant Entity_Id := Implementation_Base_Type (Typ);
begin
-- Atomic_Components
if not Has_Rep_Item (Typ, Name_Atomic_Components, False)
and then Has_Rep_Item (Typ, Name_Atomic_Components)
and then Is_Pragma_Or_Corr_Pragma_Present_In_Rep_Item
(Get_Rep_Item (Typ, Name_Atomic_Components))
then
Set_Has_Atomic_Components (Imp_Bas_Typ);
end if;
-- Volatile_Components
if not Has_Rep_Item (Typ, Name_Volatile_Components, False)
and then Has_Rep_Item (Typ, Name_Volatile_Components)
and then Is_Pragma_Or_Corr_Pragma_Present_In_Rep_Item
(Get_Rep_Item (Typ, Name_Volatile_Components))
then
Set_Has_Volatile_Components (Imp_Bas_Typ);
end if;
-- Finalize_Storage_Only
if not Has_Rep_Pragma (Typ, Name_Finalize_Storage_Only, False)
and then Has_Rep_Pragma (Typ, Name_Finalize_Storage_Only)
then
Set_Finalize_Storage_Only (Bas_Typ);
end if;
-- Universal_Aliasing
if not Has_Rep_Item (Typ, Name_Universal_Aliasing, False)
and then Has_Rep_Item (Typ, Name_Universal_Aliasing)
and then Is_Pragma_Or_Corr_Pragma_Present_In_Rep_Item
(Get_Rep_Item (Typ, Name_Universal_Aliasing))
then
Set_Universal_Aliasing (Imp_Bas_Typ);
end if;
-- Bit_Order
if Is_Record_Type (Typ) then
if not Has_Rep_Item (Typ, Name_Bit_Order, False)
and then Has_Rep_Item (Typ, Name_Bit_Order)
then
Set_Reverse_Bit_Order (Bas_Typ,
Reverse_Bit_Order (Entity (Name
(Get_Rep_Item (Typ, Name_Bit_Order)))));
end if;
end if;
-- Scalar_Storage_Order
-- Note: the aspect is specified on a first subtype, but recorded
-- in a flag of the base type!
if (Is_Record_Type (Typ) or else Is_Array_Type (Typ))
and then Typ = Bas_Typ
then
-- For a type extension, always inherit from parent; otherwise
-- inherit if no default applies. Note: we do not check for
-- an explicit rep item on the parent type when inheriting,
-- because the parent SSO may itself have been set by default.
if not Has_Rep_Item (First_Subtype (Typ),
Name_Scalar_Storage_Order, False)
and then (Is_Tagged_Type (Bas_Typ)
or else not (SSO_Set_Low_By_Default (Bas_Typ)
or else
SSO_Set_High_By_Default (Bas_Typ)))
then
Set_Reverse_Storage_Order (Bas_Typ,
Reverse_Storage_Order
(Implementation_Base_Type (Etype (Bas_Typ))));
-- Clear default SSO indications, since the inherited aspect
-- which was set explicitly overrides the default.
Set_SSO_Set_Low_By_Default (Bas_Typ, False);
Set_SSO_Set_High_By_Default (Bas_Typ, False);
end if;
end if;
end;
end if;
end Inherit_Aspects_At_Freeze_Point;
----------------
-- Initialize --
----------------
procedure Initialize is
begin
Address_Clause_Checks.Init;
Compile_Time_Warnings_Errors.Init;
Unchecked_Conversions.Init;
-- ??? Might be needed in the future for some non GCC back-ends
-- if AAMP_On_Target then
-- Independence_Checks.Init;
-- end if;
end Initialize;
---------------------------
-- Install_Discriminants --
---------------------------
procedure Install_Discriminants (E : Entity_Id) is
Disc : Entity_Id;
Prev : Entity_Id;
begin
Disc := First_Discriminant (E);
while Present (Disc) loop
Prev := Current_Entity (Disc);
Set_Current_Entity (Disc);
Set_Is_Immediately_Visible (Disc);
Set_Homonym (Disc, Prev);
Next_Discriminant (Disc);
end loop;
end Install_Discriminants;
-------------------------
-- Is_Operational_Item --
-------------------------
function Is_Operational_Item (N : Node_Id) return Boolean is
begin
if Nkind (N) /= N_Attribute_Definition_Clause then
return False;
else
declare
Id : constant Attribute_Id := Get_Attribute_Id (Chars (N));
begin
-- List of operational items is given in AARM 13.1(8.mm/1).
-- It is clearly incomplete, as it does not include iterator
-- aspects, among others.
return Id = Attribute_Constant_Indexing
or else Id = Attribute_Default_Iterator
or else Id = Attribute_Implicit_Dereference
or else Id = Attribute_Input
or else Id = Attribute_Iterator_Element
or else Id = Attribute_Iterable
or else Id = Attribute_Output
or else Id = Attribute_Read
or else Id = Attribute_Variable_Indexing
or else Id = Attribute_Write
or else Id = Attribute_External_Tag;
end;
end if;
end Is_Operational_Item;
-------------------------
-- Is_Predicate_Static --
-------------------------
-- Note: the basic legality of the expression has already been checked, so
-- we don't need to worry about cases or ranges on strings for example.
function Is_Predicate_Static
(Expr : Node_Id;
Nam : Name_Id) return Boolean
is
function All_Static_Case_Alternatives (L : List_Id) return Boolean;
-- Given a list of case expression alternatives, returns True if all
-- the alternatives are static (have all static choices, and a static
-- expression).
function All_Static_Choices (L : List_Id) return Boolean;
-- Returns true if all elements of the list are OK static choices
-- as defined below for Is_Static_Choice. Used for case expression
-- alternatives and for the right operand of a membership test. An
-- others_choice is static if the corresponding expression is static.
-- The staticness of the bounds is checked separately.
function Is_Static_Choice (N : Node_Id) return Boolean;
-- Returns True if N represents a static choice (static subtype, or
-- static subtype indication, or static expression, or static range).
--
-- Note that this is a bit more inclusive than we actually need
-- (in particular membership tests do not allow the use of subtype
-- indications). But that doesn't matter, we have already checked
-- that the construct is legal to get this far.
function Is_Type_Ref (N : Node_Id) return Boolean;
pragma Inline (Is_Type_Ref);
-- Returns True if N is a reference to the type for the predicate in the
-- expression (i.e. if it is an identifier whose Chars field matches the
-- Nam given in the call). N must not be parenthesized, if the type name
-- appears in parens, this routine will return False.
--
-- The routine also returns True for function calls generated during the
-- expansion of comparison operators on strings, which are intended to
-- be legal in static predicates, and are converted into calls to array
-- comparison routines in the body of the corresponding predicate
-- function.
----------------------------------
-- All_Static_Case_Alternatives --
----------------------------------
function All_Static_Case_Alternatives (L : List_Id) return Boolean is
N : Node_Id;
begin
N := First (L);
while Present (N) loop
if not (All_Static_Choices (Discrete_Choices (N))
and then Is_OK_Static_Expression (Expression (N)))
then
return False;
end if;
Next (N);
end loop;
return True;
end All_Static_Case_Alternatives;
------------------------
-- All_Static_Choices --
------------------------
function All_Static_Choices (L : List_Id) return Boolean is
N : Node_Id;
begin
N := First (L);
while Present (N) loop
if not Is_Static_Choice (N) then
return False;
end if;
Next (N);
end loop;
return True;
end All_Static_Choices;
----------------------
-- Is_Static_Choice --
----------------------
function Is_Static_Choice (N : Node_Id) return Boolean is
begin
return Nkind (N) = N_Others_Choice
or else Is_OK_Static_Expression (N)
or else (Is_Entity_Name (N) and then Is_Type (Entity (N))
and then Is_OK_Static_Subtype (Entity (N)))
or else (Nkind (N) = N_Subtype_Indication
and then Is_OK_Static_Subtype (Entity (N)))
or else (Nkind (N) = N_Range and then Is_OK_Static_Range (N));
end Is_Static_Choice;
-----------------
-- Is_Type_Ref --
-----------------
function Is_Type_Ref (N : Node_Id) return Boolean is
begin
return (Nkind (N) = N_Identifier
and then Chars (N) = Nam
and then Paren_Count (N) = 0)
or else Nkind (N) = N_Function_Call;
end Is_Type_Ref;
-- Start of processing for Is_Predicate_Static
begin
-- Predicate_Static means one of the following holds. Numbers are the
-- corresponding paragraph numbers in (RM 3.2.4(16-22)).
-- 16: A static expression
if Is_OK_Static_Expression (Expr) then
return True;
-- 17: A membership test whose simple_expression is the current
-- instance, and whose membership_choice_list meets the requirements
-- for a static membership test.
elsif Nkind (Expr) in N_Membership_Test
and then ((Present (Right_Opnd (Expr))
and then Is_Static_Choice (Right_Opnd (Expr)))
or else
(Present (Alternatives (Expr))
and then All_Static_Choices (Alternatives (Expr))))
then
return True;
-- 18. A case_expression whose selecting_expression is the current
-- instance, and whose dependent expressions are static expressions.
elsif Nkind (Expr) = N_Case_Expression
and then Is_Type_Ref (Expression (Expr))
and then All_Static_Case_Alternatives (Alternatives (Expr))
then
return True;
-- 19. A call to a predefined equality or ordering operator, where one
-- operand is the current instance, and the other is a static
-- expression.
-- Note: the RM is clearly wrong here in not excluding string types.
-- Without this exclusion, we would allow expressions like X > "ABC"
-- to be considered as predicate-static, which is clearly not intended,
-- since the idea is for predicate-static to be a subset of normal
-- static expressions (and "DEF" > "ABC" is not a static expression).
-- However, we do allow internally generated (not from source) equality
-- and inequality operations to be valid on strings (this helps deal
-- with cases where we transform A in "ABC" to A = "ABC).
-- In fact, it appears that the intent of the ARG is to extend static
-- predicates to strings, and that the extension should probably apply
-- to static expressions themselves. The code below accepts comparison
-- operators that apply to static strings.
elsif Nkind (Expr) in N_Op_Compare
and then ((Is_Type_Ref (Left_Opnd (Expr))
and then Is_OK_Static_Expression (Right_Opnd (Expr)))
or else
(Is_Type_Ref (Right_Opnd (Expr))
and then Is_OK_Static_Expression (Left_Opnd (Expr))))
then
return True;
-- 20. A call to a predefined boolean logical operator, where each
-- operand is predicate-static.
elsif (Nkind_In (Expr, N_Op_And, N_Op_Or, N_Op_Xor)
and then Is_Predicate_Static (Left_Opnd (Expr), Nam)
and then Is_Predicate_Static (Right_Opnd (Expr), Nam))
or else
(Nkind (Expr) = N_Op_Not
and then Is_Predicate_Static (Right_Opnd (Expr), Nam))
then
return True;
-- 21. A short-circuit control form where both operands are
-- predicate-static.
elsif Nkind (Expr) in N_Short_Circuit
and then Is_Predicate_Static (Left_Opnd (Expr), Nam)
and then Is_Predicate_Static (Right_Opnd (Expr), Nam)
then
return True;
-- 22. A parenthesized predicate-static expression. This does not
-- require any special test, since we just ignore paren levels in
-- all the cases above.
-- One more test that is an implementation artifact caused by the fact
-- that we are analyzing not the original expression, but the generated
-- expression in the body of the predicate function. This can include
-- references to inherited predicates, so that the expression we are
-- processing looks like:
-- xxPredicate (typ (Inns)) and then expression
-- Where the call is to a Predicate function for an inherited predicate.
-- We simply ignore such a call, which could be to either a dynamic or
-- a static predicate. Note that if the parent predicate is dynamic then
-- eventually this type will be marked as dynamic, but you are allowed
-- to specify a static predicate for a subtype which is inheriting a
-- dynamic predicate, so the static predicate validation here ignores
-- the inherited predicate even if it is dynamic.
-- In all cases, a static predicate can only apply to a scalar type.
elsif Nkind (Expr) = N_Function_Call
and then Is_Predicate_Function (Entity (Name (Expr)))
and then Is_Scalar_Type (Etype (First_Entity (Entity (Name (Expr)))))
then
return True;
elsif Is_Entity_Name (Expr)
and then Entity (Expr) = Standard_True
then
Error_Msg_N ("predicate is redundant (always True)?", Expr);
return True;
-- That's an exhaustive list of tests, all other cases are not
-- predicate-static, so we return False.
else
return False;
end if;
end Is_Predicate_Static;
---------------------
-- Kill_Rep_Clause --
---------------------
procedure Kill_Rep_Clause (N : Node_Id) is
begin
pragma Assert (Ignore_Rep_Clauses);
-- Note: we use Replace rather than Rewrite, because we don't want
-- ASIS to be able to use Original_Node to dig out the (undecorated)
-- rep clause that is being replaced.
Replace (N, Make_Null_Statement (Sloc (N)));
-- The null statement must be marked as not coming from source. This is
-- so that ASIS ignores it, and also the back end does not expect bogus
-- "from source" null statements in weird places (e.g. in declarative
-- regions where such null statements are not allowed).
Set_Comes_From_Source (N, False);
end Kill_Rep_Clause;
------------------
-- Minimum_Size --
------------------
function Minimum_Size
(T : Entity_Id;
Biased : Boolean := False) return Nat
is
Lo : Uint := No_Uint;
Hi : Uint := No_Uint;
LoR : Ureal := No_Ureal;
HiR : Ureal := No_Ureal;
LoSet : Boolean := False;
HiSet : Boolean := False;
B : Uint;
S : Nat;
Ancest : Entity_Id;
R_Typ : constant Entity_Id := Root_Type (T);
begin
-- If bad type, return 0
if T = Any_Type then
return 0;
-- For generic types, just return zero. There cannot be any legitimate
-- need to know such a size, but this routine may be called with a
-- generic type as part of normal processing.
elsif Is_Generic_Type (R_Typ) or else R_Typ = Any_Type then
return 0;
-- Access types (cannot have size smaller than System.Address)
elsif Is_Access_Type (T) then
return System_Address_Size;
-- Floating-point types
elsif Is_Floating_Point_Type (T) then
return UI_To_Int (Esize (R_Typ));
-- Discrete types
elsif Is_Discrete_Type (T) then
-- The following loop is looking for the nearest compile time known
-- bounds following the ancestor subtype chain. The idea is to find
-- the most restrictive known bounds information.
Ancest := T;
loop
if Ancest = Any_Type or else Etype (Ancest) = Any_Type then
return 0;
end if;
if not LoSet then
if Compile_Time_Known_Value (Type_Low_Bound (Ancest)) then
Lo := Expr_Rep_Value (Type_Low_Bound (Ancest));
LoSet := True;
exit when HiSet;
end if;
end if;
if not HiSet then
if Compile_Time_Known_Value (Type_High_Bound (Ancest)) then
Hi := Expr_Rep_Value (Type_High_Bound (Ancest));
HiSet := True;
exit when LoSet;
end if;
end if;
Ancest := Ancestor_Subtype (Ancest);
if No (Ancest) then
Ancest := Base_Type (T);
if Is_Generic_Type (Ancest) then
return 0;
end if;
end if;
end loop;
-- Fixed-point types. We can't simply use Expr_Value to get the
-- Corresponding_Integer_Value values of the bounds, since these do not
-- get set till the type is frozen, and this routine can be called
-- before the type is frozen. Similarly the test for bounds being static
-- needs to include the case where we have unanalyzed real literals for
-- the same reason.
elsif Is_Fixed_Point_Type (T) then
-- The following loop is looking for the nearest compile time known
-- bounds following the ancestor subtype chain. The idea is to find
-- the most restrictive known bounds information.
Ancest := T;
loop
if Ancest = Any_Type or else Etype (Ancest) = Any_Type then
return 0;
end if;
-- Note: In the following two tests for LoSet and HiSet, it may
-- seem redundant to test for N_Real_Literal here since normally
-- one would assume that the test for the value being known at
-- compile time includes this case. However, there is a glitch.
-- If the real literal comes from folding a non-static expression,
-- then we don't consider any non- static expression to be known
-- at compile time if we are in configurable run time mode (needed
-- in some cases to give a clearer definition of what is and what
-- is not accepted). So the test is indeed needed. Without it, we
-- would set neither Lo_Set nor Hi_Set and get an infinite loop.
if not LoSet then
if Nkind (Type_Low_Bound (Ancest)) = N_Real_Literal
or else Compile_Time_Known_Value (Type_Low_Bound (Ancest))
then
LoR := Expr_Value_R (Type_Low_Bound (Ancest));
LoSet := True;
exit when HiSet;
end if;
end if;
if not HiSet then
if Nkind (Type_High_Bound (Ancest)) = N_Real_Literal
or else Compile_Time_Known_Value (Type_High_Bound (Ancest))
then
HiR := Expr_Value_R (Type_High_Bound (Ancest));
HiSet := True;
exit when LoSet;
end if;
end if;
Ancest := Ancestor_Subtype (Ancest);
if No (Ancest) then
Ancest := Base_Type (T);
if Is_Generic_Type (Ancest) then
return 0;
end if;
end if;
end loop;
Lo := UR_To_Uint (LoR / Small_Value (T));
Hi := UR_To_Uint (HiR / Small_Value (T));
-- No other types allowed
else
raise Program_Error;
end if;
-- Fall through with Hi and Lo set. Deal with biased case
if (Biased
and then not Is_Fixed_Point_Type (T)
and then not (Is_Enumeration_Type (T)
and then Has_Non_Standard_Rep (T)))
or else Has_Biased_Representation (T)
then
Hi := Hi - Lo;
Lo := Uint_0;
end if;
-- Null range case, size is always zero. We only do this in the discrete
-- type case, since that's the odd case that came up. Probably we should
-- also do this in the fixed-point case, but doing so causes peculiar
-- gigi failures, and it is not worth worrying about this incredibly
-- marginal case (explicit null-range fixed-point type declarations)???
if Lo > Hi and then Is_Discrete_Type (T) then
S := 0;
-- Signed case. Note that we consider types like range 1 .. -1 to be
-- signed for the purpose of computing the size, since the bounds have
-- to be accommodated in the base type.
elsif Lo < 0 or else Hi < 0 then
S := 1;
B := Uint_1;
-- S = size, B = 2 ** (size - 1) (can accommodate -B .. +(B - 1))
-- Note that we accommodate the case where the bounds cross. This
-- can happen either because of the way the bounds are declared
-- or because of the algorithm in Freeze_Fixed_Point_Type.
while Lo < -B
or else Hi < -B
or else Lo >= B
or else Hi >= B
loop
B := Uint_2 ** S;
S := S + 1;
end loop;
-- Unsigned case
else
-- If both bounds are positive, make sure that both are represen-
-- table in the case where the bounds are crossed. This can happen
-- either because of the way the bounds are declared, or because of
-- the algorithm in Freeze_Fixed_Point_Type.
if Lo > Hi then
Hi := Lo;
end if;
-- S = size, (can accommodate 0 .. (2**size - 1))
S := 0;
while Hi >= Uint_2 ** S loop
S := S + 1;
end loop;
end if;
return S;
end Minimum_Size;
---------------------------
-- New_Stream_Subprogram --
---------------------------
procedure New_Stream_Subprogram
(N : Node_Id;
Ent : Entity_Id;
Subp : Entity_Id;
Nam : TSS_Name_Type)
is
Loc : constant Source_Ptr := Sloc (N);
Sname : constant Name_Id := Make_TSS_Name (Base_Type (Ent), Nam);
Subp_Id : Entity_Id;
Subp_Decl : Node_Id;
F : Entity_Id;
Etyp : Entity_Id;
Defer_Declaration : constant Boolean :=
Is_Tagged_Type (Ent) or else Is_Private_Type (Ent);
-- For a tagged type, there is a declaration for each stream attribute
-- at the freeze point, and we must generate only a completion of this
-- declaration. We do the same for private types, because the full view
-- might be tagged. Otherwise we generate a declaration at the point of
-- the attribute definition clause. If the attribute definition comes
-- from an aspect specification the declaration is part of the freeze
-- actions of the type.
function Build_Spec return Node_Id;
-- Used for declaration and renaming declaration, so that this is
-- treated as a renaming_as_body.
----------------
-- Build_Spec --
----------------
function Build_Spec return Node_Id is
Out_P : constant Boolean := (Nam = TSS_Stream_Read);
Formals : List_Id;
Spec : Node_Id;
T_Ref : constant Node_Id := New_Occurrence_Of (Etyp, Loc);
begin
Subp_Id := Make_Defining_Identifier (Loc, Sname);
-- S : access Root_Stream_Type'Class
Formals := New_List (
Make_Parameter_Specification (Loc,
Defining_Identifier =>
Make_Defining_Identifier (Loc, Name_S),
Parameter_Type =>
Make_Access_Definition (Loc,
Subtype_Mark =>
New_Occurrence_Of (
Designated_Type (Etype (F)), Loc))));
if Nam = TSS_Stream_Input then
Spec :=
Make_Function_Specification (Loc,
Defining_Unit_Name => Subp_Id,
Parameter_Specifications => Formals,
Result_Definition => T_Ref);
else
-- V : [out] T
Append_To (Formals,
Make_Parameter_Specification (Loc,
Defining_Identifier => Make_Defining_Identifier (Loc, Name_V),
Out_Present => Out_P,
Parameter_Type => T_Ref));
Spec :=
Make_Procedure_Specification (Loc,
Defining_Unit_Name => Subp_Id,
Parameter_Specifications => Formals);
end if;
return Spec;
end Build_Spec;
-- Start of processing for New_Stream_Subprogram
begin
F := First_Formal (Subp);
if Ekind (Subp) = E_Procedure then
Etyp := Etype (Next_Formal (F));
else
Etyp := Etype (Subp);
end if;
-- Prepare subprogram declaration and insert it as an action on the
-- clause node. The visibility for this entity is used to test for
-- visibility of the attribute definition clause (in the sense of
-- 8.3(23) as amended by AI-195).
if not Defer_Declaration then
Subp_Decl :=
Make_Subprogram_Declaration (Loc,
Specification => Build_Spec);
-- For a tagged type, there is always a visible declaration for each
-- stream TSS (it is a predefined primitive operation), and the
-- completion of this declaration occurs at the freeze point, which is
-- not always visible at places where the attribute definition clause is
-- visible. So, we create a dummy entity here for the purpose of
-- tracking the visibility of the attribute definition clause itself.
else
Subp_Id :=
Make_Defining_Identifier (Loc, New_External_Name (Sname, 'V'));
Subp_Decl :=
Make_Object_Declaration (Loc,
Defining_Identifier => Subp_Id,
Object_Definition => New_Occurrence_Of (Standard_Boolean, Loc));
end if;
if not Defer_Declaration
and then From_Aspect_Specification (N)
and then Has_Delayed_Freeze (Ent)
then
Append_Freeze_Action (Ent, Subp_Decl);
else
Insert_Action (N, Subp_Decl);
Set_Entity (N, Subp_Id);
end if;
Subp_Decl :=
Make_Subprogram_Renaming_Declaration (Loc,
Specification => Build_Spec,
Name => New_Occurrence_Of (Subp, Loc));
if Defer_Declaration then
Set_TSS (Base_Type (Ent), Subp_Id);
else
if From_Aspect_Specification (N) then
Append_Freeze_Action (Ent, Subp_Decl);
else
Insert_Action (N, Subp_Decl);
end if;
Copy_TSS (Subp_Id, Base_Type (Ent));
end if;
end New_Stream_Subprogram;
------------------------------------------
-- Push_Scope_And_Install_Discriminants --
------------------------------------------
procedure Push_Scope_And_Install_Discriminants (E : Entity_Id) is
begin
if Has_Discriminants (E) then
Push_Scope (E);
-- Make the discriminants visible for type declarations and protected
-- type declarations, not for subtype declarations (RM 13.1.1 (12/3))
if Nkind (Parent (E)) /= N_Subtype_Declaration then
Install_Discriminants (E);
end if;
end if;
end Push_Scope_And_Install_Discriminants;
-----------------------------------
-- Register_Address_Clause_Check --
-----------------------------------
procedure Register_Address_Clause_Check
(N : Node_Id;
X : Entity_Id;
A : Uint;
Y : Entity_Id;
Off : Boolean)
is
ACS : constant Boolean := Scope_Suppress.Suppress (Alignment_Check);
begin
Address_Clause_Checks.Append ((N, X, A, Y, Off, ACS));
end Register_Address_Clause_Check;
------------------------
-- Rep_Item_Too_Early --
------------------------
function Rep_Item_Too_Early (T : Entity_Id; N : Node_Id) return Boolean is
begin
-- Cannot apply non-operational rep items to generic types
if Is_Operational_Item (N) then
return False;
elsif Is_Type (T)
and then Is_Generic_Type (Root_Type (T))
and then (Nkind (N) /= N_Pragma
or else Get_Pragma_Id (N) /= Pragma_Convention)
then
Error_Msg_N ("representation item not allowed for generic type", N);
return True;
end if;
-- Otherwise check for incomplete type
if Is_Incomplete_Or_Private_Type (T)
and then No (Underlying_Type (T))
and then
(Nkind (N) /= N_Pragma
or else Get_Pragma_Id (N) /= Pragma_Import)
then
Error_Msg_N
("representation item must be after full type declaration", N);
return True;
-- If the type has incomplete components, a representation clause is
-- illegal but stream attributes and Convention pragmas are correct.
elsif Has_Private_Component (T) then
if Nkind (N) = N_Pragma then
return False;
else
Error_Msg_N
("representation item must appear after type is fully defined",
N);
return True;
end if;
else
return False;
end if;
end Rep_Item_Too_Early;
-----------------------
-- Rep_Item_Too_Late --
-----------------------
function Rep_Item_Too_Late
(T : Entity_Id;
N : Node_Id;
FOnly : Boolean := False) return Boolean
is
S : Entity_Id;
Parent_Type : Entity_Id;
procedure No_Type_Rep_Item;
-- Output message indicating that no type-related aspects can be
-- specified due to some property of the parent type.
procedure Too_Late;
-- Output message for an aspect being specified too late
-- Note that neither of the above errors is considered a serious one,
-- since the effect is simply that we ignore the representation clause
-- in these cases.
-- Is this really true? In any case if we make this change we must
-- document the requirement in the spec of Rep_Item_Too_Late that
-- if True is returned, then the rep item must be completely ignored???
----------------------
-- No_Type_Rep_Item --
----------------------
procedure No_Type_Rep_Item is
begin
Error_Msg_N ("|type-related representation item not permitted!", N);
end No_Type_Rep_Item;
--------------
-- Too_Late --
--------------
procedure Too_Late is
begin
-- Other compilers seem more relaxed about rep items appearing too
-- late. Since analysis tools typically don't care about rep items
-- anyway, no reason to be too strict about this.
if not Relaxed_RM_Semantics then
Error_Msg_N ("|representation item appears too late!", N);
end if;
end Too_Late;
-- Start of processing for Rep_Item_Too_Late
begin
-- First make sure entity is not frozen (RM 13.1(9))
if Is_Frozen (T)
-- Exclude imported types, which may be frozen if they appear in a
-- representation clause for a local type.
and then not From_Limited_With (T)
-- Exclude generated entities (not coming from source). The common
-- case is when we generate a renaming which prematurely freezes the
-- renamed internal entity, but we still want to be able to set copies
-- of attribute values such as Size/Alignment.
and then Comes_From_Source (T)
then
-- A self-referential aspect is illegal if it forces freezing the
-- entity before the corresponding pragma has been analyzed.
if Nkind_In (N, N_Attribute_Definition_Clause, N_Pragma)
and then From_Aspect_Specification (N)
then
Error_Msg_NE
("aspect specification causes premature freezing of&", N, T);
Set_Has_Delayed_Freeze (T, False);
return True;
end if;
Too_Late;
S := First_Subtype (T);
if Present (Freeze_Node (S)) then
if not Relaxed_RM_Semantics then
Error_Msg_NE
("??no more representation items for }", Freeze_Node (S), S);
end if;
end if;
return True;
-- Check for case of untagged derived type whose parent either has
-- primitive operations, or is a by reference type (RM 13.1(10)). In
-- this case we do not output a Too_Late message, since there is no
-- earlier point where the rep item could be placed to make it legal.
elsif Is_Type (T)
and then not FOnly
and then Is_Derived_Type (T)
and then not Is_Tagged_Type (T)
then
Parent_Type := Etype (Base_Type (T));
if Has_Primitive_Operations (Parent_Type) then
No_Type_Rep_Item;
if not Relaxed_RM_Semantics then
Error_Msg_NE
("\parent type & has primitive operations!", N, Parent_Type);
end if;
return True;
elsif Is_By_Reference_Type (Parent_Type) then
No_Type_Rep_Item;
if not Relaxed_RM_Semantics then
Error_Msg_NE
("\parent type & is a by reference type!", N, Parent_Type);
end if;
return True;
end if;
end if;
-- No error, but one more warning to consider. The RM (surprisingly)
-- allows this pattern:
-- type S is ...
-- primitive operations for S
-- type R is new S;
-- rep clause for S
-- Meaning that calls on the primitive operations of S for values of
-- type R may require possibly expensive implicit conversion operations.
-- This is not an error, but is worth a warning.
if not Relaxed_RM_Semantics and then Is_Type (T) then
declare
DTL : constant Entity_Id := Derived_Type_Link (Base_Type (T));
begin
if Present (DTL)
and then Has_Primitive_Operations (Base_Type (T))
-- For now, do not generate this warning for the case of aspect
-- specification using Ada 2012 syntax, since we get wrong
-- messages we do not understand. The whole business of derived
-- types and rep items seems a bit confused when aspects are
-- used, since the aspects are not evaluated till freeze time.
and then not From_Aspect_Specification (N)
then
Error_Msg_Sloc := Sloc (DTL);
Error_Msg_N
("representation item for& appears after derived type "
& "declaration#??", N);
Error_Msg_NE
("\may result in implicit conversions for primitive "
& "operations of&??", N, T);
Error_Msg_NE
("\to change representations when called with arguments "
& "of type&??", N, DTL);
end if;
end;
end if;
-- No error, link item into head of chain of rep items for the entity,
-- but avoid chaining if we have an overloadable entity, and the pragma
-- is one that can apply to multiple overloaded entities.
if Is_Overloadable (T) and then Nkind (N) = N_Pragma then
declare
Pname : constant Name_Id := Pragma_Name (N);
begin
if Nam_In (Pname, Name_Convention, Name_Import, Name_Export,
Name_External, Name_Interface)
then
return False;
end if;
end;
end if;
Record_Rep_Item (T, N);
return False;
end Rep_Item_Too_Late;
-------------------------------------
-- Replace_Type_References_Generic --
-------------------------------------
procedure Replace_Type_References_Generic (N : Node_Id; T : Entity_Id) is
TName : constant Name_Id := Chars (T);
function Replace_Type_Ref (N : Node_Id) return Traverse_Result;
-- Processes a single node in the traversal procedure below, checking
-- if node N should be replaced, and if so, doing the replacement.
function Visible_Component (Comp : Name_Id) return Entity_Id;
-- Given an identifier in the expression, check whether there is a
-- discriminant or component of the type that is directy visible, and
-- rewrite it as the corresponding selected component of the formal of
-- the subprogram. The entity is located by a sequential search, which
-- seems acceptable given the typical size of component lists and check
-- expressions. Possible optimization ???
----------------------
-- Replace_Type_Ref --
----------------------
function Replace_Type_Ref (N : Node_Id) return Traverse_Result is
Loc : constant Source_Ptr := Sloc (N);
procedure Add_Prefix (Ref : Node_Id; Comp : Entity_Id);
-- Add the proper prefix to a reference to a component of the type
-- when it is not already a selected component.
----------------
-- Add_Prefix --
----------------
procedure Add_Prefix (Ref : Node_Id; Comp : Entity_Id) is
begin
Rewrite (Ref,
Make_Selected_Component (Loc,
Prefix => New_Occurrence_Of (T, Loc),
Selector_Name => New_Occurrence_Of (Comp, Loc)));
Replace_Type_Reference (Prefix (Ref));
end Add_Prefix;
-- Local variables
Comp : Entity_Id;
Pref : Node_Id;
Scop : Entity_Id;
-- Start of processing for Replace_Type_Ref
begin
if Nkind (N) = N_Identifier then
-- If not the type name, check whether it is a reference to some
-- other type, which must be frozen before the predicate function
-- is analyzed, i.e. before the freeze node of the type to which
-- the predicate applies.
if Chars (N) /= TName then
if Present (Current_Entity (N))
and then Is_Type (Current_Entity (N))
then
Freeze_Before (Freeze_Node (T), Current_Entity (N));
end if;
-- The components of the type are directly visible and can
-- be referenced without a prefix.
if Nkind (Parent (N)) = N_Selected_Component then
null;
-- In expression C (I), C may be a directly visible function
-- or a visible component that has an array type. Disambiguate
-- by examining the component type.
elsif Nkind (Parent (N)) = N_Indexed_Component
and then N = Prefix (Parent (N))
then
Comp := Visible_Component (Chars (N));
if Present (Comp) and then Is_Array_Type (Etype (Comp)) then
Add_Prefix (N, Comp);
end if;
else
Comp := Visible_Component (Chars (N));
if Present (Comp) then
Add_Prefix (N, Comp);
end if;
end if;
return Skip;
-- Otherwise do the replacement if this is not a qualified
-- reference to a homograph of the type itself. Note that the
-- current instance could not appear in such a context, e.g.
-- the prefix of a type conversion.
else
if Nkind (Parent (N)) /= N_Selected_Component
or else N /= Selector_Name (Parent (N))
then
Replace_Type_Reference (N);
end if;
return Skip;
end if;
-- Case of selected component, which may be a subcomponent of the
-- current instance, or an expanded name which is still unanalyzed.
elsif Nkind (N) = N_Selected_Component then
-- If selector name is not our type, keep going (we might still
-- have an occurrence of the type in the prefix). If it is a
-- subcomponent of the current entity, add prefix.
if Nkind (Selector_Name (N)) /= N_Identifier
or else Chars (Selector_Name (N)) /= TName
then
if Nkind (Prefix (N)) = N_Identifier then
Comp := Visible_Component (Chars (Prefix (N)));
if Present (Comp) then
Add_Prefix (Prefix (N), Comp);
end if;
end if;
return OK;
-- Selector name is our type, check qualification
else
-- Loop through scopes and prefixes, doing comparison
Scop := Current_Scope;
Pref := Prefix (N);
loop
-- Continue if no more scopes or scope with no name
if No (Scop) or else Nkind (Scop) not in N_Has_Chars then
return OK;
end if;
-- Do replace if prefix is an identifier matching the scope
-- that we are currently looking at.
if Nkind (Pref) = N_Identifier
and then Chars (Pref) = Chars (Scop)
then
Replace_Type_Reference (N);
return Skip;
end if;
-- Go check scope above us if prefix is itself of the form
-- of a selected component, whose selector matches the scope
-- we are currently looking at.
if Nkind (Pref) = N_Selected_Component
and then Nkind (Selector_Name (Pref)) = N_Identifier
and then Chars (Selector_Name (Pref)) = Chars (Scop)
then
Scop := Scope (Scop);
Pref := Prefix (Pref);
-- For anything else, we don't have a match, so keep on
-- going, there are still some weird cases where we may
-- still have a replacement within the prefix.
else
return OK;
end if;
end loop;
end if;
-- Continue for any other node kind
else
return OK;
end if;
end Replace_Type_Ref;
procedure Replace_Type_Refs is new Traverse_Proc (Replace_Type_Ref);
-----------------------
-- Visible_Component --
-----------------------
function Visible_Component (Comp : Name_Id) return Entity_Id is
E : Entity_Id;
begin
-- Types with nameable components are records and discriminated
-- private types.
if Ekind (T) = E_Record_Type
or else (Is_Private_Type (T) and then Has_Discriminants (T))
then
E := First_Entity (T);
while Present (E) loop
if Comes_From_Source (E) and then Chars (E) = Comp then
return E;
end if;
Next_Entity (E);
end loop;
end if;
-- Nothing by that name, or the type has no components
return Empty;
end Visible_Component;
-- Start of processing for Replace_Type_References_Generic
begin
Replace_Type_Refs (N);
end Replace_Type_References_Generic;
--------------------------------
-- Resolve_Aspect_Expressions --
--------------------------------
procedure Resolve_Aspect_Expressions (E : Entity_Id) is
function Resolve_Name (N : Node_Id) return Traverse_Result;
-- Verify that all identifiers in the expression, with the exception
-- of references to the current entity, denote visible entities. This
-- is done only to detect visibility errors, as the expression will be
-- properly analyzed/expanded during analysis of the predicate function
-- body. We omit quantified expressions from this test, given that they
-- introduce a local identifier that would require proper expansion to
-- handle properly.
-- In ASIS_Mode we preserve the entity in the source because there is
-- no subsequent expansion to decorate the tree.
------------------
-- Resolve_Name --
------------------
function Resolve_Name (N : Node_Id) return Traverse_Result is
Dummy : Traverse_Result;
begin
if Nkind (N) = N_Selected_Component then
if Nkind (Prefix (N)) = N_Identifier
and then Chars (Prefix (N)) /= Chars (E)
then
Find_Selected_Component (N);
end if;
return Skip;
-- Resolve identifiers that are not selectors in parameter
-- associations (these are never resolved by visibility).
elsif Nkind (N) = N_Identifier
and then Chars (N) /= Chars (E)
and then (Nkind (Parent (N)) /= N_Parameter_Association
or else N /= Selector_Name (Parent (N)))
then
Find_Direct_Name (N);
-- In ASIS mode we must analyze overloaded identifiers to ensure
-- their correct decoration because expansion is disabled (and
-- the expansion of freeze nodes takes care of resolving aspect
-- expressions).
if ASIS_Mode then
if Is_Overloaded (N) then
Analyze (Parent (N));
end if;
else
Set_Entity (N, Empty);
end if;
-- The name is component association needs no resolution.
elsif Nkind (N) = N_Component_Association then
Dummy := Resolve_Name (Expression (N));
return Skip;
elsif Nkind (N) = N_Quantified_Expression then
return Skip;
end if;
return OK;
end Resolve_Name;
procedure Resolve_Aspect_Expression is new Traverse_Proc (Resolve_Name);
-- Local variables
ASN : Node_Id := First_Rep_Item (E);
-- Start of processing for Resolve_Aspect_Expressions
begin
-- Need to make sure discriminants, if any, are directly visible
Push_Scope_And_Install_Discriminants (E);
while Present (ASN) loop
if Nkind (ASN) = N_Aspect_Specification and then Entity (ASN) = E then
declare
A_Id : constant Aspect_Id := Get_Aspect_Id (ASN);
Expr : constant Node_Id := Expression (ASN);
begin
case A_Id is
-- For now we only deal with aspects that do not generate
-- subprograms, or that may mention current instances of
-- types. These will require special handling (???TBD).
when Aspect_Invariant
| Aspect_Predicate
| Aspect_Predicate_Failure
=>
null;
when Aspect_Dynamic_Predicate
| Aspect_Static_Predicate
=>
-- Build predicate function specification and preanalyze
-- expression after type replacement. The function
-- declaration must be analyzed in the scope of the
-- type, but the expression must see components.
if No (Predicate_Function (E)) then
Uninstall_Discriminants_And_Pop_Scope (E);
declare
FDecl : constant Node_Id :=
Build_Predicate_Function_Declaration (E);
pragma Unreferenced (FDecl);
begin
Push_Scope_And_Install_Discriminants (E);
Resolve_Aspect_Expression (Expr);
end;
end if;
when Pre_Post_Aspects =>
null;
when Aspect_Iterable =>
if Nkind (Expr) = N_Aggregate then
declare
Assoc : Node_Id;
begin
Assoc := First (Component_Associations (Expr));
while Present (Assoc) loop
Find_Direct_Name (Expression (Assoc));
Next (Assoc);
end loop;
end;
end if;
-- The expression for Default_Value is a static expression
-- of the type, but this expression does not freeze the
-- type, so it can still appear in a representation clause
-- before the actual freeze point.
when Aspect_Default_Value =>
Set_Must_Not_Freeze (Expr);
Preanalyze_Spec_Expression (Expr, E);
-- Ditto for Storage_Size. Any other aspects that carry
-- expressions that should not freeze ??? This is only
-- relevant to the misuse of deferred constants.
when Aspect_Storage_Size =>
Set_Must_Not_Freeze (Expr);
Preanalyze_Spec_Expression (Expr, Any_Integer);
when others =>
if Present (Expr) then
case Aspect_Argument (A_Id) is
when Expression
| Optional_Expression
=>
Analyze_And_Resolve (Expr);
when Name
| Optional_Name
=>
if Nkind (Expr) = N_Identifier then
Find_Direct_Name (Expr);
elsif Nkind (Expr) = N_Selected_Component then
Find_Selected_Component (Expr);
end if;
end case;
end if;
end case;
end;
end if;
ASN := Next_Rep_Item (ASN);
end loop;
Uninstall_Discriminants_And_Pop_Scope (E);
end Resolve_Aspect_Expressions;
-------------------------
-- Same_Representation --
-------------------------
function Same_Representation (Typ1, Typ2 : Entity_Id) return Boolean is
T1 : constant Entity_Id := Underlying_Type (Typ1);
T2 : constant Entity_Id := Underlying_Type (Typ2);
begin
-- A quick check, if base types are the same, then we definitely have
-- the same representation, because the subtype specific representation
-- attributes (Size and Alignment) do not affect representation from
-- the point of view of this test.
if Base_Type (T1) = Base_Type (T2) then
return True;
elsif Is_Private_Type (Base_Type (T2))
and then Base_Type (T1) = Full_View (Base_Type (T2))
then
return True;
end if;
-- Tagged types always have the same representation, because it is not
-- possible to specify different representations for common fields.
if Is_Tagged_Type (T1) then
return True;
end if;
-- Representations are definitely different if conventions differ
if Convention (T1) /= Convention (T2) then
return False;
end if;
-- Representations are different if component alignments or scalar
-- storage orders differ.
if (Is_Record_Type (T1) or else Is_Array_Type (T1))
and then
(Is_Record_Type (T2) or else Is_Array_Type (T2))
and then
(Component_Alignment (T1) /= Component_Alignment (T2)
or else Reverse_Storage_Order (T1) /= Reverse_Storage_Order (T2))
then
return False;
end if;
-- For arrays, the only real issue is component size. If we know the
-- component size for both arrays, and it is the same, then that's
-- good enough to know we don't have a change of representation.
if Is_Array_Type (T1) then
if Known_Component_Size (T1)
and then Known_Component_Size (T2)
and then Component_Size (T1) = Component_Size (T2)
then
return True;
end if;
end if;
-- For records, representations are different if reorderings differ
if Is_Record_Type (T1)
and then Is_Record_Type (T2)
and then No_Reordering (T1) /= No_Reordering (T2)
then
return False;
end if;
-- Types definitely have same representation if neither has non-standard
-- representation since default representations are always consistent.
-- If only one has non-standard representation, and the other does not,
-- then we consider that they do not have the same representation. They
-- might, but there is no way of telling early enough.
if Has_Non_Standard_Rep (T1) then
if not Has_Non_Standard_Rep (T2) then
return False;
end if;
else
return not Has_Non_Standard_Rep (T2);
end if;
-- Here the two types both have non-standard representation, and we need
-- to determine if they have the same non-standard representation.
-- For arrays, we simply need to test if the component sizes are the
-- same. Pragma Pack is reflected in modified component sizes, so this
-- check also deals with pragma Pack.
if Is_Array_Type (T1) then
return Component_Size (T1) = Component_Size (T2);
-- Case of record types
elsif Is_Record_Type (T1) then
-- Packed status must conform
if Is_Packed (T1) /= Is_Packed (T2) then
return False;
-- Otherwise we must check components. Typ2 maybe a constrained
-- subtype with fewer components, so we compare the components
-- of the base types.
else
Record_Case : declare
CD1, CD2 : Entity_Id;
function Same_Rep return Boolean;
-- CD1 and CD2 are either components or discriminants. This
-- function tests whether they have the same representation.
--------------
-- Same_Rep --
--------------
function Same_Rep return Boolean is
begin
if No (Component_Clause (CD1)) then
return No (Component_Clause (CD2));
else
-- Note: at this point, component clauses have been
-- normalized to the default bit order, so that the
-- comparison of Component_Bit_Offsets is meaningful.
return
Present (Component_Clause (CD2))
and then
Component_Bit_Offset (CD1) = Component_Bit_Offset (CD2)
and then
Esize (CD1) = Esize (CD2);
end if;
end Same_Rep;
-- Start of processing for Record_Case
begin
if Has_Discriminants (T1) then
-- The number of discriminants may be different if the
-- derived type has fewer (constrained by values). The
-- invisible discriminants retain the representation of
-- the original, so the discrepancy does not per se
-- indicate a different representation.
CD1 := First_Discriminant (T1);
CD2 := First_Discriminant (T2);
while Present (CD1) and then Present (CD2) loop
if not Same_Rep then
return False;
else
Next_Discriminant (CD1);
Next_Discriminant (CD2);
end if;
end loop;
end if;
CD1 := First_Component (Underlying_Type (Base_Type (T1)));
CD2 := First_Component (Underlying_Type (Base_Type (T2)));
while Present (CD1) loop
if not Same_Rep then
return False;
else
Next_Component (CD1);
Next_Component (CD2);
end if;
end loop;
return True;
end Record_Case;
end if;
-- For enumeration types, we must check each literal to see if the
-- representation is the same. Note that we do not permit enumeration
-- representation clauses for Character and Wide_Character, so these
-- cases were already dealt with.
elsif Is_Enumeration_Type (T1) then
Enumeration_Case : declare
L1, L2 : Entity_Id;
begin
L1 := First_Literal (T1);
L2 := First_Literal (T2);
while Present (L1) loop
if Enumeration_Rep (L1) /= Enumeration_Rep (L2) then
return False;
else
Next_Literal (L1);
Next_Literal (L2);
end if;
end loop;
return True;
end Enumeration_Case;
-- Any other types have the same representation for these purposes
else
return True;
end if;
end Same_Representation;
--------------------------------
-- Resolve_Iterable_Operation --
--------------------------------
procedure Resolve_Iterable_Operation
(N : Node_Id;
Cursor : Entity_Id;
Typ : Entity_Id;
Nam : Name_Id)
is
Ent : Entity_Id;
F1 : Entity_Id;
F2 : Entity_Id;
begin
if not Is_Overloaded (N) then
if not Is_Entity_Name (N)
or else Ekind (Entity (N)) /= E_Function
or else Scope (Entity (N)) /= Scope (Typ)
or else No (First_Formal (Entity (N)))
or else Etype (First_Formal (Entity (N))) /= Typ
then
Error_Msg_N
("iterable primitive must be local function name whose first "
& "formal is an iterable type", N);
return;
end if;
Ent := Entity (N);
F1 := First_Formal (Ent);
if Nam = Name_First or else Nam = Name_Last then
-- First or Last (Container) => Cursor
if Etype (Ent) /= Cursor then
Error_Msg_N ("primitive for First must yield a curosr", N);
end if;
elsif Nam = Name_Next then
-- Next (Container, Cursor) => Cursor
F2 := Next_Formal (F1);
if Etype (F2) /= Cursor
or else Etype (Ent) /= Cursor
or else Present (Next_Formal (F2))
then
Error_Msg_N ("no match for Next iterable primitive", N);
end if;
elsif Nam = Name_Previous then
-- Previous (Container, Cursor) => Cursor
F2 := Next_Formal (F1);
if Etype (F2) /= Cursor
or else Etype (Ent) /= Cursor
or else Present (Next_Formal (F2))
then
Error_Msg_N ("no match for Previous iterable primitive", N);
end if;
elsif Nam = Name_Has_Element then
-- Has_Element (Container, Cursor) => Boolean
F2 := Next_Formal (F1);
if Etype (F2) /= Cursor
or else Etype (Ent) /= Standard_Boolean
or else Present (Next_Formal (F2))
then
Error_Msg_N ("no match for Has_Element iterable primitive", N);
end if;
elsif Nam = Name_Element then
F2 := Next_Formal (F1);
if No (F2)
or else Etype (F2) /= Cursor
or else Present (Next_Formal (F2))
then
Error_Msg_N ("no match for Element iterable primitive", N);
end if;
else
raise Program_Error;
end if;
else
-- Overloaded case: find subprogram with proper signature. Caller
-- will report error if no match is found.
declare
I : Interp_Index;
It : Interp;
begin
Get_First_Interp (N, I, It);
while Present (It.Typ) loop
if Ekind (It.Nam) = E_Function
and then Scope (It.Nam) = Scope (Typ)
and then Etype (First_Formal (It.Nam)) = Typ
then
F1 := First_Formal (It.Nam);
if Nam = Name_First then
if Etype (It.Nam) = Cursor
and then No (Next_Formal (F1))
then
Set_Entity (N, It.Nam);
exit;
end if;
elsif Nam = Name_Next then
F2 := Next_Formal (F1);
if Present (F2)
and then No (Next_Formal (F2))
and then Etype (F2) = Cursor
and then Etype (It.Nam) = Cursor
then
Set_Entity (N, It.Nam);
exit;
end if;
elsif Nam = Name_Has_Element then
F2 := Next_Formal (F1);
if Present (F2)
and then No (Next_Formal (F2))
and then Etype (F2) = Cursor
and then Etype (It.Nam) = Standard_Boolean
then
Set_Entity (N, It.Nam);
F2 := Next_Formal (F1);
exit;
end if;
elsif Nam = Name_Element then
F2 := Next_Formal (F1);
if Present (F2)
and then No (Next_Formal (F2))
and then Etype (F2) = Cursor
then
Set_Entity (N, It.Nam);
exit;
end if;
end if;
end if;
Get_Next_Interp (I, It);
end loop;
end;
end if;
end Resolve_Iterable_Operation;
----------------
-- Set_Biased --
----------------
procedure Set_Biased
(E : Entity_Id;
N : Node_Id;
Msg : String;
Biased : Boolean := True)
is
begin
if Biased then
Set_Has_Biased_Representation (E);
if Warn_On_Biased_Representation then
Error_Msg_NE
("?B?" & Msg & " forces biased representation for&", N, E);
end if;
end if;
end Set_Biased;
--------------------
-- Set_Enum_Esize --
--------------------
procedure Set_Enum_Esize (T : Entity_Id) is
Lo : Uint;
Hi : Uint;
Sz : Nat;
begin
Init_Alignment (T);
-- Find the minimum standard size (8,16,32,64) that fits
Lo := Enumeration_Rep (Entity (Type_Low_Bound (T)));
Hi := Enumeration_Rep (Entity (Type_High_Bound (T)));
if Lo < 0 then
if Lo >= -Uint_2**07 and then Hi < Uint_2**07 then
Sz := Standard_Character_Size; -- May be > 8 on some targets
elsif Lo >= -Uint_2**15 and then Hi < Uint_2**15 then
Sz := 16;
elsif Lo >= -Uint_2**31 and then Hi < Uint_2**31 then
Sz := 32;
else pragma Assert (Lo >= -Uint_2**63 and then Hi < Uint_2**63);
Sz := 64;
end if;
else
if Hi < Uint_2**08 then
Sz := Standard_Character_Size; -- May be > 8 on some targets
elsif Hi < Uint_2**16 then
Sz := 16;
elsif Hi < Uint_2**32 then
Sz := 32;
else pragma Assert (Hi < Uint_2**63);
Sz := 64;
end if;
end if;
-- That minimum is the proper size unless we have a foreign convention
-- and the size required is 32 or less, in which case we bump the size
-- up to 32. This is required for C and C++ and seems reasonable for
-- all other foreign conventions.
if Has_Foreign_Convention (T)
and then Esize (T) < Standard_Integer_Size
-- Don't do this if Short_Enums on target
and then not Target_Short_Enums
then
Init_Esize (T, Standard_Integer_Size);
else
Init_Esize (T, Sz);
end if;
end Set_Enum_Esize;
-----------------------------
-- Uninstall_Discriminants --
-----------------------------
procedure Uninstall_Discriminants (E : Entity_Id) is
Disc : Entity_Id;
Prev : Entity_Id;
Outer : Entity_Id;
begin
-- Discriminants have been made visible for type declarations and
-- protected type declarations, not for subtype declarations.
if Nkind (Parent (E)) /= N_Subtype_Declaration then
Disc := First_Discriminant (E);
while Present (Disc) loop
if Disc /= Current_Entity (Disc) then
Prev := Current_Entity (Disc);
while Present (Prev)
and then Present (Homonym (Prev))
and then Homonym (Prev) /= Disc
loop
Prev := Homonym (Prev);
end loop;
else
Prev := Empty;
end if;
Set_Is_Immediately_Visible (Disc, False);
Outer := Homonym (Disc);
while Present (Outer) and then Scope (Outer) = E loop
Outer := Homonym (Outer);
end loop;
-- Reset homonym link of other entities, but do not modify link
-- between entities in current scope, so that the back end can
-- have a proper count of local overloadings.
if No (Prev) then
Set_Name_Entity_Id (Chars (Disc), Outer);
elsif Scope (Prev) /= Scope (Disc) then
Set_Homonym (Prev, Outer);
end if;
Next_Discriminant (Disc);
end loop;
end if;
end Uninstall_Discriminants;
-------------------------------------------
-- Uninstall_Discriminants_And_Pop_Scope --
-------------------------------------------
procedure Uninstall_Discriminants_And_Pop_Scope (E : Entity_Id) is
begin
if Has_Discriminants (E) then
Uninstall_Discriminants (E);
Pop_Scope;
end if;
end Uninstall_Discriminants_And_Pop_Scope;
------------------------------
-- Validate_Address_Clauses --
------------------------------
procedure Validate_Address_Clauses is
function Offset_Value (Expr : Node_Id) return Uint;
-- Given an Address attribute reference, return the value in bits of its
-- offset from the first bit of the underlying entity, or 0 if it is not
-- known at compile time.
------------------
-- Offset_Value --
------------------
function Offset_Value (Expr : Node_Id) return Uint is
N : Node_Id := Prefix (Expr);
Off : Uint;
Val : Uint := Uint_0;
begin
-- Climb the prefix chain and compute the cumulative offset
loop
if Is_Entity_Name (N) then
return Val;
elsif Nkind (N) = N_Selected_Component then
Off := Component_Bit_Offset (Entity (Selector_Name (N)));
if Off /= No_Uint and then Off >= Uint_0 then
Val := Val + Off;
N := Prefix (N);
else
return Uint_0;
end if;
elsif Nkind (N) = N_Indexed_Component then
Off := Indexed_Component_Bit_Offset (N);
if Off /= No_Uint then
Val := Val + Off;
N := Prefix (N);
else
return Uint_0;
end if;
else
return Uint_0;
end if;
end loop;
end Offset_Value;
-- Start of processing for Validate_Address_Clauses
begin
for J in Address_Clause_Checks.First .. Address_Clause_Checks.Last loop
declare
ACCR : Address_Clause_Check_Record
renames Address_Clause_Checks.Table (J);
Expr : Node_Id;
X_Alignment : Uint;
Y_Alignment : Uint := Uint_0;
X_Size : Uint;
Y_Size : Uint := Uint_0;
X_Offs : Uint;
begin
-- Skip processing of this entry if warning already posted
if not Address_Warning_Posted (ACCR.N) then
Expr := Original_Node (Expression (ACCR.N));
-- Get alignments, sizes and offset, if any
X_Alignment := Alignment (ACCR.X);
X_Size := Esize (ACCR.X);
if Present (ACCR.Y) then
Y_Alignment := Alignment (ACCR.Y);
Y_Size := Esize (ACCR.Y);
end if;
if ACCR.Off
and then Nkind (Expr) = N_Attribute_Reference
and then Attribute_Name (Expr) = Name_Address
then
X_Offs := Offset_Value (Expr);
else
X_Offs := Uint_0;
end if;
-- Check for known value not multiple of alignment
if No (ACCR.Y) then
if not Alignment_Checks_Suppressed (ACCR)
and then X_Alignment /= 0
and then ACCR.A mod X_Alignment /= 0
then
Error_Msg_NE
("??specified address for& is inconsistent with "
& "alignment", ACCR.N, ACCR.X);
Error_Msg_N
("\??program execution may be erroneous (RM 13.3(27))",
ACCR.N);
Error_Msg_Uint_1 := X_Alignment;
Error_Msg_NE ("\??alignment of & is ^", ACCR.N, ACCR.X);
end if;
-- Check for large object overlaying smaller one
elsif Y_Size > Uint_0
and then X_Size > Uint_0
and then X_Offs + X_Size > Y_Size
then
Error_Msg_NE ("??& overlays smaller object", ACCR.N, ACCR.X);
Error_Msg_N
("\??program execution may be erroneous", ACCR.N);
Error_Msg_Uint_1 := X_Size;
Error_Msg_NE ("\??size of & is ^", ACCR.N, ACCR.X);
Error_Msg_Uint_1 := Y_Size;
Error_Msg_NE ("\??size of & is ^", ACCR.N, ACCR.Y);
if Y_Size >= X_Size then
Error_Msg_Uint_1 := X_Offs;
Error_Msg_NE ("\??but offset of & is ^", ACCR.N, ACCR.X);
end if;
-- Check for inadequate alignment, both of the base object
-- and of the offset, if any. We only do this check if the
-- run-time Alignment_Check is active. No point in warning
-- if this check has been suppressed (or is suppressed by
-- default in the non-strict alignment machine case).
-- Note: we do not check the alignment if we gave a size
-- warning, since it would likely be redundant.
elsif not Alignment_Checks_Suppressed (ACCR)
and then Y_Alignment /= Uint_0
and then
(Y_Alignment < X_Alignment
or else
(ACCR.Off
and then Nkind (Expr) = N_Attribute_Reference
and then Attribute_Name (Expr) = Name_Address
and then Has_Compatible_Alignment
(ACCR.X, Prefix (Expr), True) /=
Known_Compatible))
then
Error_Msg_NE
("??specified address for& may be inconsistent with "
& "alignment", ACCR.N, ACCR.X);
Error_Msg_N
("\??program execution may be erroneous (RM 13.3(27))",
ACCR.N);
Error_Msg_Uint_1 := X_Alignment;
Error_Msg_NE ("\??alignment of & is ^", ACCR.N, ACCR.X);
Error_Msg_Uint_1 := Y_Alignment;
Error_Msg_NE ("\??alignment of & is ^", ACCR.N, ACCR.Y);
if Y_Alignment >= X_Alignment then
Error_Msg_N
("\??but offset is not multiple of alignment", ACCR.N);
end if;
end if;
end if;
end;
end loop;
end Validate_Address_Clauses;
-----------------------------------------
-- Validate_Compile_Time_Warning_Error --
-----------------------------------------
procedure Validate_Compile_Time_Warning_Error (N : Node_Id) is
begin
Compile_Time_Warnings_Errors.Append
(New_Val => CTWE_Entry'(Eloc => Sloc (N),
Scope => Current_Scope,
Prag => N));
end Validate_Compile_Time_Warning_Error;
------------------------------------------
-- Validate_Compile_Time_Warning_Errors --
------------------------------------------
procedure Validate_Compile_Time_Warning_Errors is
procedure Set_Scope (S : Entity_Id);
-- Install all enclosing scopes of S along with S itself
procedure Unset_Scope (S : Entity_Id);
-- Uninstall all enclosing scopes of S along with S itself
---------------
-- Set_Scope --
---------------
procedure Set_Scope (S : Entity_Id) is
begin
if S /= Standard_Standard then
Set_Scope (Scope (S));
end if;
Push_Scope (S);
end Set_Scope;
-----------------
-- Unset_Scope --
-----------------
procedure Unset_Scope (S : Entity_Id) is
begin
if S /= Standard_Standard then
Unset_Scope (Scope (S));
end if;
Pop_Scope;
end Unset_Scope;
-- Start of processing for Validate_Compile_Time_Warning_Errors
begin
Expander_Mode_Save_And_Set (False);
In_Compile_Time_Warning_Or_Error := True;
for N in Compile_Time_Warnings_Errors.First ..
Compile_Time_Warnings_Errors.Last
loop
declare
T : CTWE_Entry renames Compile_Time_Warnings_Errors.Table (N);
begin
Set_Scope (T.Scope);
Reset_Analyzed_Flags (T.Prag);
Process_Compile_Time_Warning_Or_Error (T.Prag, T.Eloc);
Unset_Scope (T.Scope);
end;
end loop;
In_Compile_Time_Warning_Or_Error := False;
Expander_Mode_Restore;
end Validate_Compile_Time_Warning_Errors;
---------------------------
-- Validate_Independence --
---------------------------
procedure Validate_Independence is
SU : constant Uint := UI_From_Int (System_Storage_Unit);
N : Node_Id;
E : Entity_Id;
IC : Boolean;
Comp : Entity_Id;
Addr : Node_Id;
P : Node_Id;
procedure Check_Array_Type (Atyp : Entity_Id);
-- Checks if the array type Atyp has independent components, and
-- if not, outputs an appropriate set of error messages.
procedure No_Independence;
-- Output message that independence cannot be guaranteed
function OK_Component (C : Entity_Id) return Boolean;
-- Checks one component to see if it is independently accessible, and
-- if so yields True, otherwise yields False if independent access
-- cannot be guaranteed. This is a conservative routine, it only
-- returns True if it knows for sure, it returns False if it knows
-- there is a problem, or it cannot be sure there is no problem.
procedure Reason_Bad_Component (C : Entity_Id);
-- Outputs continuation message if a reason can be determined for
-- the component C being bad.
----------------------
-- Check_Array_Type --
----------------------
procedure Check_Array_Type (Atyp : Entity_Id) is
Ctyp : constant Entity_Id := Component_Type (Atyp);
begin
-- OK if no alignment clause, no pack, and no component size
if not Has_Component_Size_Clause (Atyp)
and then not Has_Alignment_Clause (Atyp)
and then not Is_Packed (Atyp)
then
return;
end if;
-- Case of component size is greater than or equal to 64 and the
-- alignment of the array is at least as large as the alignment
-- of the component. We are definitely OK in this situation.
if Known_Component_Size (Atyp)
and then Component_Size (Atyp) >= 64
and then Known_Alignment (Atyp)
and then Known_Alignment (Ctyp)
and then Alignment (Atyp) >= Alignment (Ctyp)
then
return;
end if;
-- Check actual component size
if not Known_Component_Size (Atyp)
or else not (Addressable (Component_Size (Atyp))
and then Component_Size (Atyp) < 64)
or else Component_Size (Atyp) mod Esize (Ctyp) /= 0
then
No_Independence;
-- Bad component size, check reason
if Has_Component_Size_Clause (Atyp) then
P := Get_Attribute_Definition_Clause
(Atyp, Attribute_Component_Size);
if Present (P) then
Error_Msg_Sloc := Sloc (P);
Error_Msg_N ("\because of Component_Size clause#", N);
return;
end if;
end if;
if Is_Packed (Atyp) then
P := Get_Rep_Pragma (Atyp, Name_Pack);
if Present (P) then
Error_Msg_Sloc := Sloc (P);
Error_Msg_N ("\because of pragma Pack#", N);
return;
end if;
end if;
-- No reason found, just return
return;
end if;
-- Array type is OK independence-wise
return;
end Check_Array_Type;
---------------------
-- No_Independence --
---------------------
procedure No_Independence is
begin
if Pragma_Name (N) = Name_Independent then
Error_Msg_NE ("independence cannot be guaranteed for&", N, E);
else
Error_Msg_NE
("independent components cannot be guaranteed for&", N, E);
end if;
end No_Independence;
------------------
-- OK_Component --
------------------
function OK_Component (C : Entity_Id) return Boolean is
Rec : constant Entity_Id := Scope (C);
Ctyp : constant Entity_Id := Etype (C);
begin
-- OK if no component clause, no Pack, and no alignment clause
if No (Component_Clause (C))
and then not Is_Packed (Rec)
and then not Has_Alignment_Clause (Rec)
then
return True;
end if;
-- Here we look at the actual component layout. A component is
-- addressable if its size is a multiple of the Esize of the
-- component type, and its starting position in the record has
-- appropriate alignment, and the record itself has appropriate
-- alignment to guarantee the component alignment.
-- Make sure sizes are static, always assume the worst for any
-- cases where we cannot check static values.
if not (Known_Static_Esize (C)
and then
Known_Static_Esize (Ctyp))
then
return False;
end if;
-- Size of component must be addressable or greater than 64 bits
-- and a multiple of bytes.
if not Addressable (Esize (C)) and then Esize (C) < Uint_64 then
return False;
end if;
-- Check size is proper multiple
if Esize (C) mod Esize (Ctyp) /= 0 then
return False;
end if;
-- Check alignment of component is OK
if not Known_Component_Bit_Offset (C)
or else Component_Bit_Offset (C) < Uint_0
or else Component_Bit_Offset (C) mod Esize (Ctyp) /= 0
then
return False;
end if;
-- Check alignment of record type is OK
if not Known_Alignment (Rec)
or else (Alignment (Rec) * SU) mod Esize (Ctyp) /= 0
then
return False;
end if;
-- All tests passed, component is addressable
return True;
end OK_Component;
--------------------------
-- Reason_Bad_Component --
--------------------------
procedure Reason_Bad_Component (C : Entity_Id) is
Rec : constant Entity_Id := Scope (C);
Ctyp : constant Entity_Id := Etype (C);
begin
-- If component clause present assume that's the problem
if Present (Component_Clause (C)) then
Error_Msg_Sloc := Sloc (Component_Clause (C));
Error_Msg_N ("\because of Component_Clause#", N);
return;
end if;
-- If pragma Pack clause present, assume that's the problem
if Is_Packed (Rec) then
P := Get_Rep_Pragma (Rec, Name_Pack);
if Present (P) then
Error_Msg_Sloc := Sloc (P);
Error_Msg_N ("\because of pragma Pack#", N);
return;
end if;
end if;
-- See if record has bad alignment clause
if Has_Alignment_Clause (Rec)
and then Known_Alignment (Rec)
and then (Alignment (Rec) * SU) mod Esize (Ctyp) /= 0
then
P := Get_Attribute_Definition_Clause (Rec, Attribute_Alignment);
if Present (P) then
Error_Msg_Sloc := Sloc (P);
Error_Msg_N ("\because of Alignment clause#", N);
end if;
end if;
-- Couldn't find a reason, so return without a message
return;
end Reason_Bad_Component;
-- Start of processing for Validate_Independence
begin
for J in Independence_Checks.First .. Independence_Checks.Last loop
N := Independence_Checks.Table (J).N;
E := Independence_Checks.Table (J).E;
IC := Pragma_Name (N) = Name_Independent_Components;
-- Deal with component case
if Ekind (E) = E_Discriminant or else Ekind (E) = E_Component then
if not OK_Component (E) then
No_Independence;
Reason_Bad_Component (E);
goto Continue;
end if;
end if;
-- Deal with record with Independent_Components
if IC and then Is_Record_Type (E) then
Comp := First_Component_Or_Discriminant (E);
while Present (Comp) loop
if not OK_Component (Comp) then
No_Independence;
Reason_Bad_Component (Comp);
goto Continue;
end if;
Next_Component_Or_Discriminant (Comp);
end loop;
end if;
-- Deal with address clause case
if Is_Object (E) then
Addr := Address_Clause (E);
if Present (Addr) then
No_Independence;
Error_Msg_Sloc := Sloc (Addr);
Error_Msg_N ("\because of Address clause#", N);
goto Continue;
end if;
end if;
-- Deal with independent components for array type
if IC and then Is_Array_Type (E) then
Check_Array_Type (E);
end if;
-- Deal with independent components for array object
if IC and then Is_Object (E) and then Is_Array_Type (Etype (E)) then
Check_Array_Type (Etype (E));
end if;
<<Continue>> null;
end loop;
end Validate_Independence;
------------------------------
-- Validate_Iterable_Aspect --
------------------------------
procedure Validate_Iterable_Aspect (Typ : Entity_Id; ASN : Node_Id) is
Assoc : Node_Id;
Expr : Node_Id;
Prim : Node_Id;
Cursor : constant Entity_Id := Get_Cursor_Type (ASN, Typ);
First_Id : Entity_Id;
Last_Id : Entity_Id;
Next_Id : Entity_Id;
Has_Element_Id : Entity_Id;
Element_Id : Entity_Id;
begin
-- If previous error aspect is unusable
if Cursor = Any_Type then
return;
end if;
First_Id := Empty;
Last_Id := Empty;
Next_Id := Empty;
Has_Element_Id := Empty;
Element_Id := Empty;
-- Each expression must resolve to a function with the proper signature
Assoc := First (Component_Associations (Expression (ASN)));
while Present (Assoc) loop
Expr := Expression (Assoc);
Analyze (Expr);
Prim := First (Choices (Assoc));
if Nkind (Prim) /= N_Identifier or else Present (Next (Prim)) then
Error_Msg_N ("illegal name in association", Prim);
elsif Chars (Prim) = Name_First then
Resolve_Iterable_Operation (Expr, Cursor, Typ, Name_First);
First_Id := Entity (Expr);
elsif Chars (Prim) = Name_Last then
Resolve_Iterable_Operation (Expr, Cursor, Typ, Name_Last);
Last_Id := Entity (Expr);
elsif Chars (Prim) = Name_Previous then
Resolve_Iterable_Operation (Expr, Cursor, Typ, Name_Previous);
Last_Id := Entity (Expr);
elsif Chars (Prim) = Name_Next then
Resolve_Iterable_Operation (Expr, Cursor, Typ, Name_Next);
Next_Id := Entity (Expr);
elsif Chars (Prim) = Name_Has_Element then
Resolve_Iterable_Operation (Expr, Cursor, Typ, Name_Has_Element);
Has_Element_Id := Entity (Expr);
elsif Chars (Prim) = Name_Element then
Resolve_Iterable_Operation (Expr, Cursor, Typ, Name_Element);
Element_Id := Entity (Expr);
else
Error_Msg_N ("invalid name for iterable function", Prim);
end if;
Next (Assoc);
end loop;
if No (First_Id) then
Error_Msg_N ("match for First primitive not found", ASN);
elsif No (Next_Id) then
Error_Msg_N ("match for Next primitive not found", ASN);
elsif No (Has_Element_Id) then
Error_Msg_N ("match for Has_Element primitive not found", ASN);
elsif No (Element_Id) or else No (Last_Id) then
null; -- optional
end if;
end Validate_Iterable_Aspect;
-----------------------------------
-- Validate_Unchecked_Conversion --
-----------------------------------
procedure Validate_Unchecked_Conversion
(N : Node_Id;
Act_Unit : Entity_Id)
is
Source : Entity_Id;
Target : Entity_Id;
Vnode : Node_Id;
begin
-- Obtain source and target types. Note that we call Ancestor_Subtype
-- here because the processing for generic instantiation always makes
-- subtypes, and we want the original frozen actual types.
-- If we are dealing with private types, then do the check on their
-- fully declared counterparts if the full declarations have been
-- encountered (they don't have to be visible, but they must exist).
Source := Ancestor_Subtype (Etype (First_Formal (Act_Unit)));
if Is_Private_Type (Source)
and then Present (Underlying_Type (Source))
then
Source := Underlying_Type (Source);
end if;
Target := Ancestor_Subtype (Etype (Act_Unit));
-- If either type is generic, the instantiation happens within a generic
-- unit, and there is nothing to check. The proper check will happen
-- when the enclosing generic is instantiated.
if Is_Generic_Type (Source) or else Is_Generic_Type (Target) then
return;
end if;
if Is_Private_Type (Target)
and then Present (Underlying_Type (Target))
then
Target := Underlying_Type (Target);
end if;
-- Source may be unconstrained array, but not target, except in relaxed
-- semantics mode.
if Is_Array_Type (Target)
and then not Is_Constrained (Target)
and then not Relaxed_RM_Semantics
then
Error_Msg_N
("unchecked conversion to unconstrained array not allowed", N);
return;
end if;
-- Warn if conversion between two different convention pointers
if Is_Access_Type (Target)
and then Is_Access_Type (Source)
and then Convention (Target) /= Convention (Source)
and then Warn_On_Unchecked_Conversion
then
-- Give warnings for subprogram pointers only on most targets
if Is_Access_Subprogram_Type (Target)
or else Is_Access_Subprogram_Type (Source)
then
Error_Msg_N
("?z?conversion between pointers with different conventions!",
N);
end if;
end if;
-- Warn if one of the operands is Ada.Calendar.Time. Do not emit a
-- warning when compiling GNAT-related sources.
if Warn_On_Unchecked_Conversion
and then not In_Predefined_Unit (N)
and then RTU_Loaded (Ada_Calendar)
and then (Chars (Source) = Name_Time
or else
Chars (Target) = Name_Time)
then
-- If Ada.Calendar is loaded and the name of one of the operands is
-- Time, there is a good chance that this is Ada.Calendar.Time.
declare
Calendar_Time : constant Entity_Id := Full_View (RTE (RO_CA_Time));
begin
pragma Assert (Present (Calendar_Time));
if Source = Calendar_Time or else Target = Calendar_Time then
Error_Msg_N
("?z?representation of 'Time values may change between "
& "'G'N'A'T versions", N);
end if;
end;
end if;
-- Make entry in unchecked conversion table for later processing by
-- Validate_Unchecked_Conversions, which will check sizes and alignments
-- (using values set by the back end where possible). This is only done
-- if the appropriate warning is active.
if Warn_On_Unchecked_Conversion then
Unchecked_Conversions.Append
(New_Val => UC_Entry'(Eloc => Sloc (N),
Source => Source,
Target => Target,
Act_Unit => Act_Unit));
-- If both sizes are known statically now, then back-end annotation
-- is not required to do a proper check but if either size is not
-- known statically, then we need the annotation.
if Known_Static_RM_Size (Source)
and then
Known_Static_RM_Size (Target)
then
null;
else
Back_Annotate_Rep_Info := True;
end if;
end if;
-- If unchecked conversion to access type, and access type is declared
-- in the same unit as the unchecked conversion, then set the flag
-- No_Strict_Aliasing (no strict aliasing is implicit here)
if Is_Access_Type (Target) and then
In_Same_Source_Unit (Target, N)
then
Set_No_Strict_Aliasing (Implementation_Base_Type (Target));
end if;
-- Generate N_Validate_Unchecked_Conversion node for back end in case
-- the back end needs to perform special validation checks.
-- Shouldn't this be in Exp_Ch13, since the check only gets done if we
-- have full expansion and the back end is called ???
Vnode :=
Make_Validate_Unchecked_Conversion (Sloc (N));
Set_Source_Type (Vnode, Source);
Set_Target_Type (Vnode, Target);
-- If the unchecked conversion node is in a list, just insert before it.
-- If not we have some strange case, not worth bothering about.
if Is_List_Member (N) then
Insert_After (N, Vnode);
end if;
end Validate_Unchecked_Conversion;
------------------------------------
-- Validate_Unchecked_Conversions --
------------------------------------
procedure Validate_Unchecked_Conversions is
begin
for N in Unchecked_Conversions.First .. Unchecked_Conversions.Last loop
declare
T : UC_Entry renames Unchecked_Conversions.Table (N);
Act_Unit : constant Entity_Id := T.Act_Unit;
Eloc : constant Source_Ptr := T.Eloc;
Source : constant Entity_Id := T.Source;
Target : constant Entity_Id := T.Target;
Source_Siz : Uint;
Target_Siz : Uint;
begin
-- Skip if function marked as warnings off
if Warnings_Off (Act_Unit) then
goto Continue;
end if;
-- This validation check, which warns if we have unequal sizes for
-- unchecked conversion, and thus potentially implementation
-- dependent semantics, is one of the few occasions on which we
-- use the official RM size instead of Esize. See description in
-- Einfo "Handling of Type'Size Values" for details.
if Serious_Errors_Detected = 0
and then Known_Static_RM_Size (Source)
and then Known_Static_RM_Size (Target)
-- Don't do the check if warnings off for either type, note the
-- deliberate use of OR here instead of OR ELSE to get the flag
-- Warnings_Off_Used set for both types if appropriate.
and then not (Has_Warnings_Off (Source)
or
Has_Warnings_Off (Target))
then
Source_Siz := RM_Size (Source);
Target_Siz := RM_Size (Target);
if Source_Siz /= Target_Siz then
Error_Msg
("?z?types for unchecked conversion have different sizes!",
Eloc, Act_Unit);
if All_Errors_Mode then
Error_Msg_Name_1 := Chars (Source);
Error_Msg_Uint_1 := Source_Siz;
Error_Msg_Name_2 := Chars (Target);
Error_Msg_Uint_2 := Target_Siz;
Error_Msg ("\size of % is ^, size of % is ^?z?", Eloc);
Error_Msg_Uint_1 := UI_Abs (Source_Siz - Target_Siz);
if Is_Discrete_Type (Source)
and then
Is_Discrete_Type (Target)
then
if Source_Siz > Target_Siz then
Error_Msg
("\?z?^ high order bits of source will "
& "be ignored!", Eloc);
elsif Is_Unsigned_Type (Source) then
Error_Msg
("\?z?source will be extended with ^ high order "
& "zero bits!", Eloc);
else
Error_Msg
("\?z?source will be extended with ^ high order "
& "sign bits!", Eloc);
end if;
elsif Source_Siz < Target_Siz then
if Is_Discrete_Type (Target) then
if Bytes_Big_Endian then
Error_Msg
("\?z?target value will include ^ undefined "
& "low order bits!", Eloc, Act_Unit);
else
Error_Msg
("\?z?target value will include ^ undefined "
& "high order bits!", Eloc, Act_Unit);
end if;
else
Error_Msg
("\?z?^ trailing bits of target value will be "
& "undefined!", Eloc, Act_Unit);
end if;
else pragma Assert (Source_Siz > Target_Siz);
if Is_Discrete_Type (Source) then
if Bytes_Big_Endian then
Error_Msg
("\?z?^ low order bits of source will be "
& "ignored!", Eloc, Act_Unit);
else
Error_Msg
("\?z?^ high order bits of source will be "
& "ignored!", Eloc, Act_Unit);
end if;
else
Error_Msg
("\?z?^ trailing bits of source will be "
& "ignored!", Eloc, Act_Unit);
end if;
end if;
end if;
end if;
end if;
-- If both types are access types, we need to check the alignment.
-- If the alignment of both is specified, we can do it here.
if Serious_Errors_Detected = 0
and then Is_Access_Type (Source)
and then Is_Access_Type (Target)
and then Target_Strict_Alignment
and then Present (Designated_Type (Source))
and then Present (Designated_Type (Target))
then
declare
D_Source : constant Entity_Id := Designated_Type (Source);
D_Target : constant Entity_Id := Designated_Type (Target);
begin
if Known_Alignment (D_Source)
and then
Known_Alignment (D_Target)
then
declare
Source_Align : constant Uint := Alignment (D_Source);
Target_Align : constant Uint := Alignment (D_Target);
begin
if Source_Align < Target_Align
and then not Is_Tagged_Type (D_Source)
-- Suppress warning if warnings suppressed on either
-- type or either designated type. Note the use of
-- OR here instead of OR ELSE. That is intentional,
-- we would like to set flag Warnings_Off_Used in
-- all types for which warnings are suppressed.
and then not (Has_Warnings_Off (D_Source)
or
Has_Warnings_Off (D_Target)
or
Has_Warnings_Off (Source)
or
Has_Warnings_Off (Target))
then
Error_Msg_Uint_1 := Target_Align;
Error_Msg_Uint_2 := Source_Align;
Error_Msg_Node_1 := D_Target;
Error_Msg_Node_2 := D_Source;
Error_Msg
("?z?alignment of & (^) is stricter than "
& "alignment of & (^)!", Eloc, Act_Unit);
Error_Msg
("\?z?resulting access value may have invalid "
& "alignment!", Eloc, Act_Unit);
end if;
end;
end if;
end;
end if;
end;
<<Continue>>
null;
end loop;
end Validate_Unchecked_Conversions;
end Sem_Ch13;