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------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- E X P _ I M G V --
-- --
-- B o d y --
-- --
-- Copyright (C) 2001-2021, 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 Atree; use Atree;
with Casing; use Casing;
with Checks; use Checks;
with Einfo; use Einfo;
with Einfo.Entities; use Einfo.Entities;
with Einfo.Utils; use Einfo.Utils;
with Debug; use Debug;
with Exp_Put_Image;
with Exp_Util; use Exp_Util;
with Lib; use Lib;
with Namet; use Namet;
with Nmake; use Nmake;
with Nlists; use Nlists;
with Opt; use Opt;
with Restrict; use Restrict;
with Rident; use Rident;
with Rtsfind; use Rtsfind;
with Sem_Aux; use Sem_Aux;
with Sem_Res; use Sem_Res;
with Sem_Util; use Sem_Util;
with Sinfo; use Sinfo;
with Sinfo.Nodes; use Sinfo.Nodes;
with Sinfo.Utils; use Sinfo.Utils;
with Snames; use Snames;
with Stand; use Stand;
with Stringt; use Stringt;
with Targparm; use Targparm;
with Tbuild; use Tbuild;
with Ttypes; use Ttypes;
with Uintp; use Uintp;
with Urealp; use Urealp;
with System.Perfect_Hash_Generators;
package body Exp_Imgv is
procedure Rewrite_Object_Image
(N : Node_Id;
Pref : Entity_Id;
Attr_Name : Name_Id;
Str_Typ : Entity_Id);
-- AI12-0124: Rewrite attribute 'Image when it is applied to an object
-- reference as an attribute applied to a type. N denotes the node to be
-- rewritten, Pref denotes the prefix of the 'Image attribute, and Name
-- and Str_Typ specify which specific string type and 'Image attribute to
-- apply (e.g. Name_Wide_Image and Standard_Wide_String).
------------------------------------
-- Build_Enumeration_Image_Tables --
------------------------------------
procedure Build_Enumeration_Image_Tables (E : Entity_Id; N : Node_Id) is
Loc : constant Source_Ptr := Sloc (E);
In_Main_Unit : constant Boolean := In_Extended_Main_Code_Unit (Loc);
Act : List_Id;
Eind : Entity_Id;
Estr : Entity_Id;
H_Id : Entity_Id;
H_OK : Boolean;
H_Sp : Node_Id;
Ind : List_Id;
Ityp : Node_Id;
Len : Nat;
Lit : Entity_Id;
Nlit : Nat;
S_Id : Entity_Id;
S_N : Nat;
Str : String_Id;
package SPHG renames System.Perfect_Hash_Generators;
Saved_SSO : constant Character := Opt.Default_SSO;
-- Used to save the current scalar storage order during the generation
-- of the literal lookup table.
Serial_Number_Budget : constant := 50;
-- We may want to compute a perfect hash function for use by the Value
-- attribute. However computing this function is costly and, therefore,
-- cannot be done when compiling every unit where the enumeration type
-- is referenced, so we do it only when compiling the unit where it is
-- declared. This means that we may need to control the internal serial
-- numbers of this unit, or else we would risk generating public symbols
-- with mismatched names later on. The strategy for this is to allocate
-- a fixed budget of serial numbers to be spent from a specified point
-- until the end of the processing and to make sure that it is always
-- exactly spent on all possible paths from this point.
Threshold : constant Nat :=
(if Is_Library_Level_Entity (E)
or else not Always_Compatible_Rep_On_Target
then 3
else Nat'Last);
-- Threshold above which we want to generate the hash function in the
-- default case. We avoid doing it if this would cause a trampoline to
-- be generated because the type is local and descriptors are not used.
Threshold_For_Size : constant Nat := Nat'Max (Threshold, 9);
-- But the function and its tables take a bit of space so the threshold
-- is raised when compiling for size.
procedure Append_Table_To
(L : List_Id;
E : Entity_Id;
UB : Nat;
Ctyp : Entity_Id;
V : List_Id);
-- Append to L the declaration of E as a constant array of range 0 .. UB
-- and component type Ctyp with initial value V.
---------------------
-- Append_Table_To --
---------------------
procedure Append_Table_To
(L : List_Id;
E : Entity_Id;
UB : Nat;
Ctyp : Entity_Id;
V : List_Id)
is
begin
Append_To (L,
Make_Object_Declaration (Loc,
Defining_Identifier => E,
Constant_Present => True,
Object_Definition =>
Make_Constrained_Array_Definition (Loc,
Discrete_Subtype_Definitions => New_List (
Make_Range (Loc,
Low_Bound => Make_Integer_Literal (Loc, 0),
High_Bound => Make_Integer_Literal (Loc, UB))),
Component_Definition =>
Make_Component_Definition (Loc,
Aliased_Present => False,
Subtype_Indication => New_Occurrence_Of (Ctyp, Loc))),
Expression => Make_Aggregate (Loc, Expressions => V)));
end Append_Table_To;
-- Start of Build_Enumeration_Image_Tables
begin
-- Nothing to do for types other than a root enumeration type
if E /= Root_Type (E) then
return;
-- Nothing to do if pragma Discard_Names applies
elsif Discard_Names (E) then
return;
end if;
-- Otherwise tables need constructing
Start_String;
Ind := New_List;
Lit := First_Literal (E);
Len := 1;
Nlit := 0;
H_OK := False;
loop
Append_To (Ind, Make_Integer_Literal (Loc, UI_From_Int (Len)));
exit when No (Lit);
Nlit := Nlit + 1;
Get_Unqualified_Decoded_Name_String (Chars (Lit));
if Name_Buffer (1) /= ''' then
Set_Casing (All_Upper_Case);
end if;
Store_String_Chars (Name_Buffer (1 .. Name_Len));
if In_Main_Unit then
SPHG.Insert (Name_Buffer (1 .. Name_Len));
end if;
Len := Len + Int (Name_Len);
Next_Literal (Lit);
end loop;
if Len < Int (2 ** (8 - 1)) then
Ityp := Standard_Integer_8;
elsif Len < Int (2 ** (16 - 1)) then
Ityp := Standard_Integer_16;
else
Ityp := Standard_Integer_32;
end if;
Str := End_String;
Estr :=
Make_Defining_Identifier (Loc,
Chars => New_External_Name (Chars (E), 'S'));
Eind :=
Make_Defining_Identifier (Loc,
Chars => New_External_Name (Chars (E), 'N'));
Set_Lit_Strings (E, Estr);
Set_Lit_Indexes (E, Eind);
-- Temporarily set the current scalar storage order to the default
-- during the generation of the literals table, since both the Image and
-- Value attributes rely on runtime routines for interpreting table
-- values.
Opt.Default_SSO := ' ';
-- Generate literal table
Act :=
New_List (
Make_Object_Declaration (Loc,
Defining_Identifier => Estr,
Constant_Present => True,
Object_Definition =>
New_Occurrence_Of (Standard_String, Loc),
Expression =>
Make_String_Literal (Loc,
Strval => Str)));
-- Generate index table
Append_Table_To (Act, Eind, Nlit, Ityp, Ind);
-- If the number of literals is not greater than Threshold, then we are
-- done. Otherwise we generate a (perfect) hash function for use by the
-- Value attribute.
if Nlit > Threshold then
-- We start to count serial numbers from here
S_N := Increment_Serial_Number;
-- Generate specification of hash function
H_Id :=
Make_Defining_Identifier (Loc,
Chars => New_External_Name (Chars (E), 'H'));
Mutate_Ekind (H_Id, E_Function);
Set_Is_Internal (H_Id);
if not Debug_Generated_Code then
Set_Debug_Info_Off (H_Id);
end if;
Set_Lit_Hash (E, H_Id);
S_Id := Make_Temporary (Loc, 'S');
H_Sp := Make_Function_Specification (Loc,
Defining_Unit_Name => H_Id,
Parameter_Specifications => New_List (
Make_Parameter_Specification (Loc,
Defining_Identifier => S_Id,
Parameter_Type =>
New_Occurrence_Of (Standard_String, Loc))),
Result_Definition =>
New_Occurrence_Of (Standard_Natural, Loc));
-- If the unit where the type is declared is the main unit, and the
-- number of literals is greater than Threshold_For_Size when we are
-- optimizing for size, and the restriction No_Implicit_Loops is not
-- active, and -gnatd_h is not specified, generate the hash function.
if In_Main_Unit
and then (Optimize_Size = 0 or else Nlit > Threshold_For_Size)
and then not Restriction_Active (No_Implicit_Loops)
and then not Debug_Flag_Underscore_H
then
declare
LB : constant Positive := 2 * Positive (Nlit) + 1;
UB : constant Positive := LB + 24;
begin
-- Try at most 25 * 4 times to compute the hash function before
-- giving up and using a linear search for the Value attribute.
for V in LB .. UB loop
begin
SPHG.Initialize (4321, V, SPHG.Memory_Space, Tries => 4);
SPHG.Compute ("");
H_OK := True;
exit;
exception
when SPHG.Too_Many_Tries => null;
end;
end loop;
end;
end if;
-- If the hash function has been successfully computed, 4 more tables
-- named P, T1, T2 and G are needed. The hash function is of the form
-- function Hash (S : String) return Natural is
-- xxxP : constant array (0 .. X) of Natural = [...];
-- xxxT1 : constant array (0 .. Y) of Index_Type = [...];
-- xxxT2 : constant array (0 .. Y) of Index_Type = [...];
-- xxxG : constant array (0 .. Z) of Index_Type = [...];
-- F : constant Natural := S'First - 1;
-- L : constant Natural := S'Length;
-- A, B : Natural := 0;
-- J : Natural;
-- begin
-- for K in P'Range loop
-- exit when L < P (K);
-- J := Character'Pos (S (P (K) + F));
-- A := (A + Natural (T1 (K) * J)) mod N;
-- B := (B + Natural (T2 (K) * J)) mod N;
-- end loop;
-- return (Natural (G (A)) + Natural (G (B))) mod M;
-- end Hash;
-- where N is the length of G and M the number of literals. Note that
-- we declare the tables inside the function for two reasons: first,
-- their analysis creates array subtypes and thus their concatenation
-- operators which are homonyms of the concatenation operator and may
-- change the homonym number of user operators declared in the scope;
-- second, the code generator can fold the values in the tables when
-- they are small and avoid emitting them in the final object code.
if H_OK then
declare
Siz, L1, L2 : Natural;
I : Int;
Pos, T1, T2, G : List_Id;
EPos, ET1, ET2, EG : Entity_Id;
F, L, A, B, J, K : Entity_Id;
Body_Decls : List_Id;
Body_Stmts : List_Id;
Loop_Stmts : List_Id;
begin
Body_Decls := New_List;
-- Generate position table
SPHG.Define (SPHG.Character_Position, Siz, L1, L2);
Pos := New_List;
for J in 0 .. L1 - 1 loop
I := Int (SPHG.Value (SPHG.Character_Position, J));
Append_To (Pos, Make_Integer_Literal (Loc, UI_From_Int (I)));
end loop;
EPos :=
Make_Defining_Identifier (Loc,
Chars => New_External_Name (Chars (E), 'P'));
Append_Table_To
(Body_Decls, EPos, Nat (L1 - 1), Standard_Natural, Pos);
-- Generate function table 1
SPHG.Define (SPHG.Function_Table_1, Siz, L1, L2);
T1 := New_List;
for J in 0 .. L1 - 1 loop
I := Int (SPHG.Value (SPHG.Function_Table_1, J));
Append_To (T1, Make_Integer_Literal (Loc, UI_From_Int (I)));
end loop;
ET1 :=
Make_Defining_Identifier (Loc,
Chars => New_External_Name (Chars (E), "T1"));
Ityp :=
Small_Integer_Type_For (UI_From_Int (Int (Siz)), Uns => True);
Append_Table_To (Body_Decls, ET1, Nat (L1 - 1), Ityp, T1);
-- Generate function table 2
SPHG.Define (SPHG.Function_Table_2, Siz, L1, L2);
T2 := New_List;
for J in 0 .. L1 - 1 loop
I := Int (SPHG.Value (SPHG.Function_Table_2, J));
Append_To (T2, Make_Integer_Literal (Loc, UI_From_Int (I)));
end loop;
ET2 :=
Make_Defining_Identifier (Loc,
Chars => New_External_Name (Chars (E), "T2"));
Ityp :=
Small_Integer_Type_For (UI_From_Int (Int (Siz)), Uns => True);
Append_Table_To (Body_Decls, ET2, Nat (L1 - 1), Ityp, T2);
-- Generate graph table
SPHG.Define (SPHG.Graph_Table, Siz, L1, L2);
G := New_List;
for J in 0 .. L1 - 1 loop
I := Int (SPHG.Value (SPHG.Graph_Table, J));
Append_To (G, Make_Integer_Literal (Loc, UI_From_Int (I)));
end loop;
EG :=
Make_Defining_Identifier (Loc,
Chars => New_External_Name (Chars (E), 'G'));
Ityp :=
Small_Integer_Type_For (UI_From_Int (Int (Siz)), Uns => True);
Append_Table_To (Body_Decls, EG, Nat (L1 - 1), Ityp, G);
F := Make_Temporary (Loc, 'F');
Append_To (Body_Decls,
Make_Object_Declaration (Loc,
Defining_Identifier => F,
Object_Definition =>
New_Occurrence_Of (Standard_Natural, Loc),
Expression =>
Make_Op_Subtract (Loc,
Left_Opnd =>
Make_Attribute_Reference (Loc,
Prefix => New_Occurrence_Of (S_Id, Loc),
Attribute_Name => Name_First),
Right_Opnd =>
Make_Integer_Literal (Loc, 1))));
L := Make_Temporary (Loc, 'L');
Append_To (Body_Decls,
Make_Object_Declaration (Loc,
Defining_Identifier => L,
Object_Definition =>
New_Occurrence_Of (Standard_Natural, Loc),
Expression =>
Make_Attribute_Reference (Loc,
Prefix => New_Occurrence_Of (S_Id, Loc),
Attribute_Name => Name_Length)));
A := Make_Temporary (Loc, 'A');
Append_To (Body_Decls,
Make_Object_Declaration (Loc,
Defining_Identifier => A,
Object_Definition =>
New_Occurrence_Of (Standard_Natural, Loc),
Expression => Make_Integer_Literal (Loc, 0)));
B := Make_Temporary (Loc, 'B');
Append_To (Body_Decls,
Make_Object_Declaration (Loc,
Defining_Identifier => B,
Object_Definition =>
New_Occurrence_Of (Standard_Natural, Loc),
Expression => Make_Integer_Literal (Loc, 0)));
J := Make_Temporary (Loc, 'J');
Append_To (Body_Decls,
Make_Object_Declaration (Loc,
Defining_Identifier => J,
Object_Definition =>
New_Occurrence_Of (Standard_Natural, Loc)));
K := Make_Temporary (Loc, 'K');
-- Generate exit when L < P (K);
Loop_Stmts := New_List (
Make_Exit_Statement (Loc,
Condition =>
Make_Op_Lt (Loc,
Left_Opnd => New_Occurrence_Of (L, Loc),
Right_Opnd =>
Make_Indexed_Component (Loc,
Prefix => New_Occurrence_Of (EPos, Loc),
Expressions => New_List (
New_Occurrence_Of (K, Loc))))));
-- Generate J := Character'Pos (S (P (K) + F));
Append_To (Loop_Stmts,
Make_Assignment_Statement (Loc,
Name => New_Occurrence_Of (J, Loc),
Expression =>
Make_Attribute_Reference (Loc,
Prefix =>
New_Occurrence_Of (Standard_Character, Loc),
Attribute_Name => Name_Pos,
Expressions => New_List (
Make_Indexed_Component (Loc,
Prefix => New_Occurrence_Of (S_Id, Loc),
Expressions => New_List (
Make_Op_Add (Loc,
Left_Opnd =>
Make_Indexed_Component (Loc,
Prefix =>
New_Occurrence_Of (EPos, Loc),
Expressions => New_List (
New_Occurrence_Of (K, Loc))),
Right_Opnd =>
New_Occurrence_Of (F, Loc))))))));
-- Generate A := (A + Natural (T1 (K) * J)) mod N;
Append_To (Loop_Stmts,
Make_Assignment_Statement (Loc,
Name => New_Occurrence_Of (A, Loc),
Expression =>
Make_Op_Mod (Loc,
Left_Opnd =>
Make_Op_Add (Loc,
Left_Opnd => New_Occurrence_Of (A, Loc),
Right_Opnd =>
Make_Op_Multiply (Loc,
Left_Opnd =>
Convert_To (Standard_Natural,
Make_Indexed_Component (Loc,
Prefix =>
New_Occurrence_Of (ET1, Loc),
Expressions => New_List (
New_Occurrence_Of (K, Loc)))),
Right_Opnd => New_Occurrence_Of (J, Loc))),
Right_Opnd => Make_Integer_Literal (Loc, Int (L1)))));
-- Generate B := (B + Natural (T2 (K) * J)) mod N;
Append_To (Loop_Stmts,
Make_Assignment_Statement (Loc,
Name => New_Occurrence_Of (B, Loc),
Expression =>
Make_Op_Mod (Loc,
Left_Opnd =>
Make_Op_Add (Loc,
Left_Opnd => New_Occurrence_Of (B, Loc),
Right_Opnd =>
Make_Op_Multiply (Loc,
Left_Opnd =>
Convert_To (Standard_Natural,
Make_Indexed_Component (Loc,
Prefix =>
New_Occurrence_Of (ET2, Loc),
Expressions => New_List (
New_Occurrence_Of (K, Loc)))),
Right_Opnd => New_Occurrence_Of (J, Loc))),
Right_Opnd => Make_Integer_Literal (Loc, Int (L1)))));
-- Generate loop
Body_Stmts := New_List (
Make_Implicit_Loop_Statement (N,
Iteration_Scheme =>
Make_Iteration_Scheme (Loc,
Loop_Parameter_Specification =>
Make_Loop_Parameter_Specification (Loc,
Defining_Identifier => K,
Discrete_Subtype_Definition =>
Make_Attribute_Reference (Loc,
Prefix =>
New_Occurrence_Of (EPos, Loc),
Attribute_Name => Name_Range))),
Statements => Loop_Stmts));
-- Generate return (Natural (G (A)) + Natural (G (B))) mod M;
Append_To (Body_Stmts,
Make_Simple_Return_Statement (Loc,
Expression =>
Make_Op_Mod (Loc,
Left_Opnd =>
Make_Op_Add (Loc,
Left_Opnd =>
Convert_To (Standard_Natural,
Make_Indexed_Component (Loc,
Prefix =>
New_Occurrence_Of (EG, Loc),
Expressions => New_List (
New_Occurrence_Of (A, Loc)))),
Right_Opnd =>
Convert_To (Standard_Natural,
Make_Indexed_Component (Loc,
Prefix =>
New_Occurrence_Of (EG, Loc),
Expressions => New_List (
New_Occurrence_Of (B, Loc))))),
Right_Opnd => Make_Integer_Literal (Loc, Nlit))));
-- Generate final body
Append_To (Act,
Make_Subprogram_Body (Loc,
Specification => H_Sp,
Declarations => Body_Decls,
Handled_Statement_Sequence =>
Make_Handled_Sequence_Of_Statements (Loc, Body_Stmts)));
end;
-- If we chose not to or did not manage to compute the hash function,
-- we need to build a dummy function always returning Natural'Last
-- because other units reference it if they use the Value attribute.
elsif In_Main_Unit then
declare
Body_Stmts : List_Id;
begin
-- Generate return Natural'Last
Body_Stmts := New_List (
Make_Simple_Return_Statement (Loc,
Expression =>
Make_Attribute_Reference (Loc,
Prefix =>
New_Occurrence_Of (Standard_Natural, Loc),
Attribute_Name => Name_Last)));
-- Generate body
Append_To (Act,
Make_Subprogram_Body (Loc,
Specification => H_Sp,
Declarations => Empty_List,
Handled_Statement_Sequence =>
Make_Handled_Sequence_Of_Statements (Loc, Body_Stmts)));
end;
-- For the other units, just declare the function
else
Append_To (Act,
Make_Subprogram_Declaration (Loc, Specification => H_Sp));
end if;
else
Set_Lit_Hash (E, Empty);
end if;
if In_Main_Unit then
System.Perfect_Hash_Generators.Finalize;
end if;
Insert_Actions (N, Act, Suppress => All_Checks);
-- This is where we check that our budget of serial numbers has been
-- entirely spent, see the declaration of Serial_Number_Budget above.
if Nlit > Threshold then
Synchronize_Serial_Number (S_N + Serial_Number_Budget);
end if;
-- Reset the scalar storage order to the saved value
Opt.Default_SSO := Saved_SSO;
end Build_Enumeration_Image_Tables;
----------------------------
-- Expand_Image_Attribute --
----------------------------
-- For all cases other than user-defined enumeration types, the scheme
-- is as follows. First we insert the following code:
-- Snn : String (1 .. rt'Width);
-- Pnn : Natural;
-- Image_xx (tv, Snn, Pnn [,pm]);
--
-- and then Expr is replaced by Snn (1 .. Pnn)
-- In the above expansion:
-- rt is the root type of the expression
-- tv is the expression with the value, usually a type conversion
-- pm is an extra parameter present in some cases
-- The following table shows tv, xx, and (if used) pm for the various
-- possible types of the argument:
-- For types whose root type is Character
-- xx = Character
-- tv = Character (Expr)
-- For types whose root type is Boolean
-- xx = Boolean
-- tv = Boolean (Expr)
-- For signed integer types
-- xx = [Long_Long_[Long_]]Integer
-- tv = [Long_Long_[Long_]]Integer (Expr)
-- For modular types
-- xx = [Long_Long_[Long_]]Unsigned
-- tv = System.Unsigned_Types.[Long_Long_[Long_]]Unsigned (Expr)
-- For types whose root type is Wide_Character
-- xx = Wide_Character
-- tv = Wide_Character (Expr)
-- pm = Boolean, true if Ada 2005 mode, False otherwise
-- For types whose root type is Wide_Wide_Character
-- xx = Wide_Wide_Character
-- tv = Wide_Wide_Character (Expr)
-- For floating-point types
-- xx = Floating_Point
-- tv = [Long_[Long_]]Float (Expr)
-- pm = typ'Digits (typ = subtype of expression)
-- For decimal fixed-point types
-- xx = Decimal{32,64,128}
-- tv = Integer_{32,64,128} (Expr)? [convert with no scaling]
-- pm = typ'Scale (typ = subtype of expression)
-- For the most common ordinary fixed-point types
-- xx = Fixed{32,64,128}
-- tv = Integer_{32,64,128} (Expr) [convert with no scaling]
-- pm = numerator of typ'Small (typ = subtype of expression)
-- denominator of typ'Small
-- (Integer_{32,64,128} x typ'Small)'Fore
-- typ'Aft
-- For other ordinary fixed-point types
-- xx = Fixed
-- tv = Long_Float (Expr)
-- pm = typ'Aft (typ = subtype of expression)
-- For enumeration types other than those declared in package Standard
-- or System, Snn, Pnn, are expanded as above, but the call looks like:
-- Image_Enumeration_NN (rt'Pos (X), Snn, Pnn, typS, typI'Address)
-- where rt is the root type of the expression, and typS and typI are
-- the entities constructed as described in the spec for the procedure
-- Build_Enumeration_Image_Tables and NN is 32/16/8 depending on the
-- element type of Lit_Indexes. The rewriting of the expression to
-- Snn (1 .. Pnn) then occurs as in the other cases. A special case is
-- when pragma Discard_Names applies, in which case we replace expr by:
-- (rt'Pos (expr))'Img
-- So that the result is a space followed by the decimal value for the
-- position of the enumeration value in the enumeration type.
procedure Expand_Image_Attribute (N : Node_Id) is
Loc : constant Source_Ptr := Sloc (N);
Exprs : constant List_Id := Expressions (N);
Expr : constant Node_Id := Relocate_Node (First (Exprs));
Pref : constant Node_Id := Prefix (N);
procedure Expand_Standard_Boolean_Image;
-- Expand attribute 'Image in Standard.Boolean, avoiding string copy
procedure Expand_User_Defined_Enumeration_Image (Typ : Entity_Id);
-- Expand attribute 'Image in user-defined enumeration types, avoiding
-- string copy.
-----------------------------------
-- Expand_Standard_Boolean_Image --
-----------------------------------
procedure Expand_Standard_Boolean_Image is
Ins_List : constant List_Id := New_List;
S1_Id : constant Entity_Id := Make_Temporary (Loc, 'S');
T_Id : constant Entity_Id := Make_Temporary (Loc, 'T');
F_Id : constant Entity_Id := Make_Temporary (Loc, 'F');
V_Id : constant Entity_Id := Make_Temporary (Loc, 'V');
begin
-- We use a single 5-character string subtype throughout so that the
-- subtype of the string if-expression is constrained and, therefore,
-- does not force the creation of a temporary during analysis.
-- Generate:
-- subtype S1 is String (1 .. 5);
Append_To (Ins_List,
Make_Subtype_Declaration (Loc,
Defining_Identifier => S1_Id,
Subtype_Indication =>
Make_Subtype_Indication (Loc,
Subtype_Mark =>
New_Occurrence_Of (Standard_String, Loc),
Constraint =>
Make_Index_Or_Discriminant_Constraint (Loc,
Constraints => New_List (
Make_Range (Loc,
Low_Bound => Make_Integer_Literal (Loc, 1),
High_Bound => Make_Integer_Literal (Loc, 5)))))));
-- Generate:
-- T : constant String (1 .. 5) := "TRUE ";
Start_String;
Store_String_Chars ("TRUE ");
Append_To (Ins_List,
Make_Object_Declaration (Loc,
Defining_Identifier => T_Id,
Object_Definition =>
New_Occurrence_Of (S1_Id, Loc),
Constant_Present => True,
Expression => Make_String_Literal (Loc, End_String)));
-- Generate:
-- F : constant String (1 .. 5) := "FALSE";
Start_String;
Store_String_Chars ("FALSE");
Append_To (Ins_List,
Make_Object_Declaration (Loc,
Defining_Identifier => F_Id,
Object_Definition =>
New_Occurrence_Of (S1_Id, Loc),
Constant_Present => True,
Expression => Make_String_Literal (Loc, End_String)));
-- Generate:
-- V : String (1 .. 5) renames (if Expr then T else F);
Append_To (Ins_List,
Make_Object_Renaming_Declaration (Loc,
Defining_Identifier => V_Id,
Subtype_Mark =>
New_Occurrence_Of (S1_Id, Loc),
Name =>
Make_If_Expression (Loc,
Expressions => New_List (
Duplicate_Subexpr (Expr),
New_Occurrence_Of (T_Id, Loc),
New_Occurrence_Of (F_Id, Loc)))));
-- Insert all the above declarations before N. We suppress checks
-- because everything is in range at this stage.
Insert_Actions (N, Ins_List, Suppress => All_Checks);
-- Final step is to rewrite the expression as a slice:
-- V (1 .. (if Expr then 4 else 5)) and analyze, again with no
-- checks, since we are sure that everything is OK.
Rewrite (N,
Make_Slice (Loc,
Prefix => New_Occurrence_Of (V_Id, Loc),
Discrete_Range =>
Make_Range (Loc,
Low_Bound => Make_Integer_Literal (Loc, 1),
High_Bound =>
Make_If_Expression (Loc,
Expressions => New_List (
Duplicate_Subexpr (Expr),
Make_Integer_Literal (Loc, 4),
Make_Integer_Literal (Loc, 5))))));
Analyze_And_Resolve (N, Standard_String, Suppress => All_Checks);
end Expand_Standard_Boolean_Image;
-------------------------------------------
-- Expand_User_Defined_Enumeration_Image --
-------------------------------------------
procedure Expand_User_Defined_Enumeration_Image (Typ : Entity_Id) is
Ins_List : constant List_Id := New_List;
P1_Id : constant Entity_Id := Make_Temporary (Loc, 'P');
P2_Id : constant Entity_Id := Make_Temporary (Loc, 'P');
P3_Id : constant Entity_Id := Make_Temporary (Loc, 'P');
P4_Id : constant Entity_Id := Make_Temporary (Loc, 'P');
S1_Id : constant Entity_Id := Make_Temporary (Loc, 'S');
begin
-- Apply a validity check, since it is a bit drastic to get a
-- completely junk image value for an invalid value.
if not Expr_Known_Valid (Expr) then
Insert_Valid_Check (Expr);
end if;
-- Generate:
-- P1 : constant Natural := Typ'Pos (Typ?(Expr));
Append_To (Ins_List,
Make_Object_Declaration (Loc,
Defining_Identifier => P1_Id,
Object_Definition =>
New_Occurrence_Of (Standard_Natural, Loc),
Constant_Present => True,
Expression =>
Convert_To (Standard_Natural,
Make_Attribute_Reference (Loc,
Attribute_Name => Name_Pos,
Prefix => New_Occurrence_Of (Typ, Loc),
Expressions => New_List (OK_Convert_To (Typ, Expr))))));
-- Compute the index of the string start, generating:
-- P2 : constant Natural := call_put_enumN (P1);
Append_To (Ins_List,
Make_Object_Declaration (Loc,
Defining_Identifier => P2_Id,
Object_Definition =>
New_Occurrence_Of (Standard_Natural, Loc),
Constant_Present => True,
Expression =>
Convert_To (Standard_Natural,
Make_Indexed_Component (Loc,
Prefix =>
New_Occurrence_Of (Lit_Indexes (Typ), Loc),
Expressions =>
New_List (New_Occurrence_Of (P1_Id, Loc))))));
-- Compute the index of the next value, generating:
-- P3 : constant Natural := call_put_enumN (P1 + 1);
declare
Add_Node : constant Node_Id := New_Op_Node (N_Op_Add, Loc);
begin
Set_Left_Opnd (Add_Node, New_Occurrence_Of (P1_Id, Loc));
Set_Right_Opnd (Add_Node, Make_Integer_Literal (Loc, 1));
Append_To (Ins_List,
Make_Object_Declaration (Loc,
Defining_Identifier => P3_Id,
Object_Definition =>
New_Occurrence_Of (Standard_Natural, Loc),
Constant_Present => True,
Expression =>
Convert_To (Standard_Natural,
Make_Indexed_Component (Loc,
Prefix =>
New_Occurrence_Of (Lit_Indexes (Typ), Loc),
Expressions =>
New_List (Add_Node)))));
end;
-- Generate:
-- P4 : String renames call_put_enumS (P2 .. P3 - 1);
declare
Sub_Node : constant Node_Id := New_Op_Node (N_Op_Subtract, Loc);
begin
Set_Left_Opnd (Sub_Node, New_Occurrence_Of (P3_Id, Loc));
Set_Right_Opnd (Sub_Node, Make_Integer_Literal (Loc, 1));
Append_To (Ins_List,
Make_Object_Renaming_Declaration (Loc,
Defining_Identifier => P4_Id,
Subtype_Mark =>
New_Occurrence_Of (Standard_String, Loc),
Name =>
Make_Slice (Loc,
Prefix =>
New_Occurrence_Of (Lit_Strings (Typ), Loc),
Discrete_Range =>
Make_Range (Loc,
Low_Bound => New_Occurrence_Of (P2_Id, Loc),
High_Bound => Sub_Node))));
end;
-- Generate:
-- subtype S1 is String (1 .. P3 - P2);
declare
HB : constant Node_Id := New_Op_Node (N_Op_Subtract, Loc);
begin
Set_Left_Opnd (HB, New_Occurrence_Of (P3_Id, Loc));
Set_Right_Opnd (HB, New_Occurrence_Of (P2_Id, Loc));
Append_To (Ins_List,
Make_Subtype_Declaration (Loc,
Defining_Identifier => S1_Id,
Subtype_Indication =>
Make_Subtype_Indication (Loc,
Subtype_Mark =>
New_Occurrence_Of (Standard_String, Loc),
Constraint =>
Make_Index_Or_Discriminant_Constraint (Loc,
Constraints => New_List (
Make_Range (Loc,
Low_Bound => Make_Integer_Literal (Loc, 1),
High_Bound => HB))))));
end;
-- Insert all the above declarations before N. We suppress checks
-- because everything is in range at this stage.
Insert_Actions (N, Ins_List, Suppress => All_Checks);
Rewrite (N,
Unchecked_Convert_To (S1_Id, New_Occurrence_Of (P4_Id, Loc)));
Analyze_And_Resolve (N, Standard_String);
end Expand_User_Defined_Enumeration_Image;
-- Local variables
Enum_Case : Boolean;
Imid : RE_Id;
Proc_Ent : Entity_Id;
Ptyp : Entity_Id;
Rtyp : Entity_Id;
Tent : Entity_Id := Empty;
Ttyp : Entity_Id;
Arg_List : List_Id;
-- List of arguments for run-time procedure call
Ins_List : List_Id;
-- List of actions to be inserted
Snn : constant Entity_Id := Make_Temporary (Loc, 'S');
Pnn : constant Entity_Id := Make_Temporary (Loc, 'P');
-- Start of processing for Expand_Image_Attribute
begin
if Is_Object_Image (Pref) then
Rewrite_Object_Image (N, Pref, Name_Image, Standard_String);
return;
end if;
-- If Image should be transformed using Put_Image, then do so. See
-- Exp_Put_Image for details.
if Exp_Put_Image.Image_Should_Call_Put_Image (N) then
Rewrite (N, Exp_Put_Image.Build_Image_Call (N));
Analyze_And_Resolve (N, Standard_String, Suppress => All_Checks);
return;
end if;
Ptyp := Underlying_Type (Entity (Pref));
-- Ada 2022 allows 'Image on private types, so fetch the underlying
-- type to obtain the structure of the type. We use the base type,
-- not the root type for discrete types, to handle properly derived
-- types, but we use the root type for enumeration types, because the
-- literal map is attached to the root. Should be inherited ???
if Is_Real_Type (Ptyp) or else Is_Enumeration_Type (Ptyp) then
Rtyp := Underlying_Type (Root_Type (Ptyp));
else
Rtyp := Underlying_Type (Base_Type (Ptyp));
end if;
-- Set Imid (RE_Id of procedure to call), and Tent, target for the
-- type conversion of the first argument for all possibilities.
Enum_Case := False;
if Rtyp = Standard_Boolean then
-- Use inline expansion if the -gnatd_x switch is not passed to the
-- compiler. Otherwise expand into a call to the runtime.
if not Debug_Flag_Underscore_X then
Expand_Standard_Boolean_Image;
return;
else
Imid := RE_Image_Boolean;
Tent := Rtyp;
end if;
-- For standard character, we have to select the version which handles
-- soft hyphen correctly, based on the version of Ada in use (this is
-- ugly, but we have no choice).
elsif Rtyp = Standard_Character then
if Ada_Version < Ada_2005 then
Imid := RE_Image_Character;
else
Imid := RE_Image_Character_05;
end if;
Tent := Rtyp;
elsif Rtyp = Standard_Wide_Character then
Imid := RE_Image_Wide_Character;
Tent := Rtyp;
elsif Rtyp = Standard_Wide_Wide_Character then
Imid := RE_Image_Wide_Wide_Character;
Tent := Rtyp;
elsif Is_Signed_Integer_Type (Rtyp) then
if Esize (Rtyp) <= Standard_Integer_Size then
Imid := RE_Image_Integer;
Tent := Standard_Integer;
elsif Esize (Rtyp) <= Standard_Long_Long_Integer_Size then
Imid := RE_Image_Long_Long_Integer;
Tent := Standard_Long_Long_Integer;
else
Imid := RE_Image_Long_Long_Long_Integer;
Tent := Standard_Long_Long_Long_Integer;
end if;
elsif Is_Modular_Integer_Type (Rtyp) then
if Modulus (Rtyp) <= Modulus (RTE (RE_Unsigned)) then
Imid := RE_Image_Unsigned;
Tent := RTE (RE_Unsigned);
elsif Modulus (Rtyp) <= Modulus (RTE (RE_Long_Long_Unsigned)) then
Imid := RE_Image_Long_Long_Unsigned;
Tent := RTE (RE_Long_Long_Unsigned);
else
Imid := RE_Image_Long_Long_Long_Unsigned;
Tent := RTE (RE_Long_Long_Long_Unsigned);
end if;
elsif Is_Decimal_Fixed_Point_Type (Rtyp) then
if Esize (Rtyp) <= 32 then
Imid := RE_Image_Decimal32;
Tent := RTE (RE_Integer_32);
elsif Esize (Rtyp) <= 64 then
Imid := RE_Image_Decimal64;
Tent := RTE (RE_Integer_64);
else
Imid := RE_Image_Decimal128;
Tent := RTE (RE_Integer_128);
end if;
elsif Is_Ordinary_Fixed_Point_Type (Rtyp) then
declare
Num : constant Uint := Norm_Num (Small_Value (Rtyp));
Den : constant Uint := Norm_Den (Small_Value (Rtyp));
Max : constant Uint := UI_Max (Num, Den);
Min : constant Uint := UI_Min (Num, Den);
Siz : constant Uint := Esize (Rtyp);
begin
-- Note that we do not use sharp bounds to speed things up
if Siz <= 32
and then Max <= Uint_2 ** 31
and then (Min = Uint_1
or else (Num < Den and then Den <= Uint_2 ** 27)
or else (Den < Num and then Num <= Uint_2 ** 25))
then
Imid := RE_Image_Fixed32;
Tent := RTE (RE_Integer_32);
elsif Siz <= 64
and then Max <= Uint_2 ** 63
and then (Min = Uint_1
or else (Num < Den and then Den <= Uint_2 ** 59)
or else (Den < Num and then Num <= Uint_2 ** 53))
then
Imid := RE_Image_Fixed64;
Tent := RTE (RE_Integer_64);
elsif System_Max_Integer_Size = 128
and then Max <= Uint_2 ** 127
and then (Min = Uint_1
or else (Num < Den and then Den <= Uint_2 ** 123)
or else (Den < Num and then Num <= Uint_2 ** 122))
then
Imid := RE_Image_Fixed128;
Tent := RTE (RE_Integer_128);
else
Imid := RE_Image_Fixed;
Tent := Standard_Long_Float;
end if;
end;
elsif Is_Floating_Point_Type (Rtyp) then
-- Short_Float and Float are the same type for GNAT
if Rtyp = Standard_Short_Float or else Rtyp = Standard_Float then
Imid := RE_Image_Float;
Tent := Standard_Float;
elsif Rtyp = Standard_Long_Float then
Imid := RE_Image_Long_Float;
Tent := Standard_Long_Float;
else
Imid := RE_Image_Long_Long_Float;
Tent := Standard_Long_Long_Float;
end if;
-- Only other possibility is user-defined enumeration type
else
pragma Assert (Is_Enumeration_Type (Rtyp));
if Discard_Names (First_Subtype (Ptyp))
or else No (Lit_Strings (Rtyp))
then
-- When pragma Discard_Names applies to the first subtype, build
-- (Long_Long_Integer (Pref'Pos (Expr)))'Img. The conversion is
-- there to avoid applying 'Img directly in Universal_Integer,
-- which can be a very large type. See also the handling of 'Val.
Rewrite (N,
Make_Attribute_Reference (Loc,
Prefix =>
Convert_To (Standard_Long_Long_Integer,
Make_Attribute_Reference (Loc,
Prefix => Pref,
Attribute_Name => Name_Pos,
Expressions => New_List (Expr))),
Attribute_Name =>
Name_Img));
Analyze_And_Resolve (N, Standard_String);
return;
-- Use inline expansion if the -gnatd_x switch is not passed to the
-- compiler. Otherwise expand into a call to the runtime.
elsif not Debug_Flag_Underscore_X then
Expand_User_Defined_Enumeration_Image (Rtyp);
return;
else
Ttyp := Component_Type (Etype (Lit_Indexes (Rtyp)));
if Ttyp = Standard_Integer_8 then
Imid := RE_Image_Enumeration_8;
elsif Ttyp = Standard_Integer_16 then
Imid := RE_Image_Enumeration_16;
else
Imid := RE_Image_Enumeration_32;
end if;
-- Apply a validity check, since it is a bit drastic to get a
-- completely junk image value for an invalid value.
if not Expr_Known_Valid (Expr) then
Insert_Valid_Check (Expr);
end if;
Enum_Case := True;
end if;
end if;
-- Build first argument for call
if Enum_Case then
Arg_List := New_List (
Make_Attribute_Reference (Loc,
Attribute_Name => Name_Pos,
Prefix => New_Occurrence_Of (Ptyp, Loc),
Expressions => New_List (Expr)));
-- AI12-0020: Ada 2022 allows 'Image for all types, including private
-- types. If the full type is not a fixed-point type, then it is enough
-- to set the Conversion_OK flag. However, that would not work for
-- fixed-point types, because that flag changes the run-time semantics
-- of fixed-point type conversions; therefore, we must first convert to
-- Rtyp, and then to Tent.
else
declare
Conv : Node_Id;
begin
if Is_Private_Type (Etype (Expr)) then
if Is_Fixed_Point_Type (Rtyp) then
Conv := Convert_To (Tent, OK_Convert_To (Rtyp, Expr));
else
Conv := OK_Convert_To (Tent, Expr);
end if;
else
Conv := Convert_To (Tent, Expr);
end if;
Arg_List := New_List (Conv);
end;
end if;
-- Build declarations of Snn and Pnn to be inserted
Ins_List := New_List (
-- Snn : String (1 .. typ'Width);
Make_Object_Declaration (Loc,
Defining_Identifier => Snn,
Object_Definition =>
Make_Subtype_Indication (Loc,
Subtype_Mark => New_Occurrence_Of (Standard_String, Loc),
Constraint =>
Make_Index_Or_Discriminant_Constraint (Loc,
Constraints => New_List (
Make_Range (Loc,
Low_Bound => Make_Integer_Literal (Loc, 1),
High_Bound =>
Make_Attribute_Reference (Loc,
Prefix => New_Occurrence_Of (Rtyp, Loc),
Attribute_Name => Name_Width)))))),
-- Pnn : Natural;
Make_Object_Declaration (Loc,
Defining_Identifier => Pnn,
Object_Definition => New_Occurrence_Of (Standard_Natural, Loc)));
-- Append Snn, Pnn arguments
Append_To (Arg_List, New_Occurrence_Of (Snn, Loc));
Append_To (Arg_List, New_Occurrence_Of (Pnn, Loc));
-- Get entity of procedure to call
Proc_Ent := RTE (Imid);
-- If the procedure entity is empty, that means we have a case in
-- no run time mode where the operation is not allowed, and an
-- appropriate diagnostic has already been issued.
if No (Proc_Ent) then
return;
end if;
-- Otherwise complete preparation of arguments for run-time call
-- Add extra arguments for Enumeration case
if Enum_Case then
Append_To (Arg_List, New_Occurrence_Of (Lit_Strings (Rtyp), Loc));
Append_To (Arg_List,
Make_Attribute_Reference (Loc,
Prefix => New_Occurrence_Of (Lit_Indexes (Rtyp), Loc),
Attribute_Name => Name_Address));
-- For floating-point types, append Digits argument
elsif Is_Floating_Point_Type (Rtyp) then
Append_To (Arg_List,
Make_Attribute_Reference (Loc,
Prefix => New_Occurrence_Of (Ptyp, Loc),
Attribute_Name => Name_Digits));
-- For decimal, append Scale and also set to do literal conversion
elsif Is_Decimal_Fixed_Point_Type (Rtyp) then
Set_Conversion_OK (First (Arg_List));
Append_To (Arg_List, Make_Integer_Literal (Loc, Scale_Value (Ptyp)));
-- For ordinary fixed-point types, append Num, Den, Fore, Aft parameters
-- and also set to do literal conversion.
elsif Is_Ordinary_Fixed_Point_Type (Rtyp) then
if Imid /= RE_Image_Fixed then
Set_Conversion_OK (First (Arg_List));
Append_To (Arg_List,
Make_Integer_Literal (Loc, -Norm_Num (Small_Value (Ptyp))));
Append_To (Arg_List,
Make_Integer_Literal (Loc, -Norm_Den (Small_Value (Ptyp))));
-- We want to compute the Fore value for the fixed point type
-- whose mantissa type is Tent and whose small is typ'Small.
declare
T : Ureal := Uint_2 ** (Esize (Tent) - 1) * Small_Value (Ptyp);
F : Nat := 2;
begin
while T >= Ureal_10 loop
F := F + 1;
T := T / Ureal_10;
end loop;
Append_To (Arg_List,
Make_Integer_Literal (Loc, UI_From_Int (F)));
end;
end if;
Append_To (Arg_List, Make_Integer_Literal (Loc, Aft_Value (Ptyp)));
-- For Wide_Character, append Ada 2005 indication
elsif Rtyp = Standard_Wide_Character then
Append_To (Arg_List,
New_Occurrence_Of
(Boolean_Literals (Ada_Version >= Ada_2005), Loc));
end if;
-- Now append the procedure call to the insert list
Append_To (Ins_List,
Make_Procedure_Call_Statement (Loc,
Name => New_Occurrence_Of (Proc_Ent, Loc),
Parameter_Associations => Arg_List));
-- Insert declarations of Snn, Pnn, and the procedure call. We suppress
-- checks because we are sure that everything is in range at this stage.
Insert_Actions (N, Ins_List, Suppress => All_Checks);
-- Final step is to rewrite the expression as a slice and analyze,
-- again with no checks, since we are sure that everything is OK.
Rewrite (N,
Make_Slice (Loc,
Prefix => New_Occurrence_Of (Snn, Loc),
Discrete_Range =>
Make_Range (Loc,
Low_Bound => Make_Integer_Literal (Loc, 1),
High_Bound => New_Occurrence_Of (Pnn, Loc))));
Analyze_And_Resolve (N, Standard_String, Suppress => All_Checks);
end Expand_Image_Attribute;
----------------------------------
-- Expand_Valid_Value_Attribute --
----------------------------------
procedure Expand_Valid_Value_Attribute (N : Node_Id) is
Loc : constant Source_Ptr := Sloc (N);
Btyp : constant Entity_Id := Base_Type (Entity (Prefix (N)));
Rtyp : constant Entity_Id := Root_Type (Btyp);
pragma Assert (Is_Enumeration_Type (Rtyp));
Args : constant List_Id := Expressions (N);
Func : RE_Id;
Ttyp : Entity_Id;
begin
-- Generate:
-- Valid_Value_Enumeration_NN
-- (typS, typN'Address, typH'Unrestricted_Access, Num, X)
Ttyp := Component_Type (Etype (Lit_Indexes (Rtyp)));
if Ttyp = Standard_Integer_8 then
Func := RE_Valid_Value_Enumeration_8;
elsif Ttyp = Standard_Integer_16 then
Func := RE_Valid_Value_Enumeration_16;
else
Func := RE_Valid_Value_Enumeration_32;
end if;
Prepend_To (Args,
Make_Attribute_Reference (Loc,
Prefix => New_Occurrence_Of (Rtyp, Loc),
Attribute_Name => Name_Pos,
Expressions => New_List (
Make_Attribute_Reference (Loc,
Prefix => New_Occurrence_Of (Rtyp, Loc),
Attribute_Name => Name_Last))));
if Present (Lit_Hash (Rtyp)) then
Prepend_To (Args,
Make_Attribute_Reference (Loc,
Prefix => New_Occurrence_Of (Lit_Hash (Rtyp), Loc),
Attribute_Name => Name_Unrestricted_Access));
else
Prepend_To (Args, Make_Null (Loc));
end if;
Prepend_To (Args,
Make_Attribute_Reference (Loc,
Prefix => New_Occurrence_Of (Lit_Indexes (Rtyp), Loc),
Attribute_Name => Name_Address));
Prepend_To (Args,
New_Occurrence_Of (Lit_Strings (Rtyp), Loc));
Rewrite (N,
Make_Function_Call (Loc,
Name =>
New_Occurrence_Of (RTE (Func), Loc),
Parameter_Associations => Args));
Analyze_And_Resolve (N, Standard_Boolean);
end Expand_Valid_Value_Attribute;
----------------------------
-- Expand_Value_Attribute --
----------------------------
-- For scalar types derived from Boolean, Character and integer types
-- in package Standard, typ'Value (X) expands into:
-- btyp (Value_xx (X))
-- where btyp is the base type of the prefix
-- For types whose root type is Character
-- xx = Character
-- For types whose root type is Wide_Character
-- xx = Wide_Character
-- For types whose root type is Wide_Wide_Character
-- xx = Wide_Wide_Character
-- For types whose root type is Boolean
-- xx = Boolean
-- For signed integer types
-- xx = [Long_Long_[Long_]]Integer
-- For modular types
-- xx = [Long_Long_[Long_]]Unsigned
-- For floating-point types
-- xx = [Long_[Long_]]Float
-- For decimal fixed-point types, typ'Value (X) expands into
-- btyp?(Value_Decimal{32,64,128} (X, typ'Scale));
-- For the most common ordinary fixed-point types, it expands into
-- btyp?(Value_Fixed{32,64,128} (X, numerator of S, denominator of S));
-- where S = typ'Small
-- For other ordinary fixed-point types, it expands into
-- btyp (Value_Long_Float (X))
-- For Wide_[Wide_]Character types, typ'Value (X) expands into
-- btyp (Value_xx (X, EM))
-- where btyp is the base type of the prefix, and EM is the encoding method
-- For enumeration types other than those derived from types Boolean,
-- Character, Wide_[Wide_]Character in Standard, typ'Value (X) expands to:
-- Enum'Val
-- (Value_Enumeration_NN
-- (typS, typN'Address, typH'Unrestricted_Access, Num, X))
-- where typS, typN and typH are the Lit_Strings, Lit_Indexes and Lit_Hash
-- entities from T's root type entity, and Num is Enum'Pos (Enum'Last).
-- The Value_Enumeration_NN function will search the tables looking for
-- X and return the position number in the table if found which is
-- used to provide the result of 'Value (using Enum'Val). If the
-- value is not found Constraint_Error is raised. The suffix _NN
-- depends on the element type of typN.
procedure Expand_Value_Attribute (N : Node_Id) is
Loc : constant Source_Ptr := Sloc (N);
Btyp : constant Entity_Id := Etype (N);
pragma Assert (Is_Base_Type (Btyp));
pragma Assert (Btyp = Base_Type (Entity (Prefix (N))));
Rtyp : constant Entity_Id := Root_Type (Btyp);
Args : constant List_Id := Expressions (N);
Ttyp : Entity_Id;
Vid : RE_Id;
begin
-- Fall through for all cases except user-defined enumeration type
-- and decimal types, with Vid set to the Id of the entity for the
-- Value routine and Args set to the list of parameters for the call.
if Rtyp = Standard_Boolean then
Vid := RE_Value_Boolean;
elsif Rtyp = Standard_Character then
Vid := RE_Value_Character;
elsif Rtyp = Standard_Wide_Character then
Vid := RE_Value_Wide_Character;
Append_To (Args,
Make_Integer_Literal (Loc,
Intval => Int (Wide_Character_Encoding_Method)));
elsif Rtyp = Standard_Wide_Wide_Character then
Vid := RE_Value_Wide_Wide_Character;
Append_To (Args,
Make_Integer_Literal (Loc,
Intval => Int (Wide_Character_Encoding_Method)));
elsif Is_Signed_Integer_Type (Rtyp) then
if Esize (Rtyp) <= Standard_Integer_Size then
Vid := RE_Value_Integer;
elsif Esize (Rtyp) <= Standard_Long_Long_Integer_Size then
Vid := RE_Value_Long_Long_Integer;
else
Vid := RE_Value_Long_Long_Long_Integer;
end if;
elsif Is_Modular_Integer_Type (Rtyp) then
if Modulus (Rtyp) <= Modulus (RTE (RE_Unsigned)) then
Vid := RE_Value_Unsigned;
elsif Modulus (Rtyp) <= Modulus (RTE (RE_Long_Long_Unsigned)) then
Vid := RE_Value_Long_Long_Unsigned;
else
Vid := RE_Value_Long_Long_Long_Unsigned;
end if;
elsif Is_Decimal_Fixed_Point_Type (Rtyp) then
if Esize (Rtyp) <= 32 and then abs (Scale_Value (Rtyp)) <= 9 then
Vid := RE_Value_Decimal32;
elsif Esize (Rtyp) <= 64 and then abs (Scale_Value (Rtyp)) <= 18 then
Vid := RE_Value_Decimal64;
else
Vid := RE_Value_Decimal128;
end if;
Append_To (Args, Make_Integer_Literal (Loc, Scale_Value (Rtyp)));
Rewrite (N,
OK_Convert_To (Btyp,
Make_Function_Call (Loc,
Name => New_Occurrence_Of (RTE (Vid), Loc),
Parameter_Associations => Args)));
Set_Etype (N, Btyp);
Analyze_And_Resolve (N, Btyp);
return;
elsif Is_Ordinary_Fixed_Point_Type (Rtyp) then
declare
Num : constant Uint := Norm_Num (Small_Value (Rtyp));
Den : constant Uint := Norm_Den (Small_Value (Rtyp));
Max : constant Uint := UI_Max (Num, Den);
Min : constant Uint := UI_Min (Num, Den);
Siz : constant Uint := Esize (Rtyp);
begin
if Siz <= 32
and then Max <= Uint_2 ** 31
and then (Min = Uint_1 or else Max <= Uint_2 ** 27)
then
Vid := RE_Value_Fixed32;
elsif Siz <= 64
and then Max <= Uint_2 ** 63
and then (Min = Uint_1 or else Max <= Uint_2 ** 59)
then
Vid := RE_Value_Fixed64;
elsif System_Max_Integer_Size = 128
and then Max <= Uint_2 ** 127
and then (Min = Uint_1 or else Max <= Uint_2 ** 123)
then
Vid := RE_Value_Fixed128;
else
Vid := RE_Value_Long_Float;
end if;
if Vid /= RE_Value_Long_Float then
Append_To (Args,
Make_Integer_Literal (Loc, -Norm_Num (Small_Value (Rtyp))));
Append_To (Args,
Make_Integer_Literal (Loc, -Norm_Den (Small_Value (Rtyp))));
Rewrite (N,
OK_Convert_To (Btyp,
Make_Function_Call (Loc,
Name => New_Occurrence_Of (RTE (Vid), Loc),
Parameter_Associations => Args)));
Set_Etype (N, Btyp);
Analyze_And_Resolve (N, Btyp);
return;
end if;
end;
elsif Is_Floating_Point_Type (Rtyp) then
-- Short_Float and Float are the same type for GNAT
if Rtyp = Standard_Short_Float or else Rtyp = Standard_Float then
Vid := RE_Value_Float;
elsif Rtyp = Standard_Long_Float then
Vid := RE_Value_Long_Float;
else
Vid := RE_Value_Long_Long_Float;
end if;
-- Only other possibility is user-defined enumeration type
else
pragma Assert (Is_Enumeration_Type (Rtyp));
-- Case of pragma Discard_Names, transform the Value
-- attribute to Btyp'Val (Long_Long_Integer'Value (Args))
if Discard_Names (First_Subtype (Btyp))
or else No (Lit_Strings (Rtyp))
then
Rewrite (N,
Make_Attribute_Reference (Loc,
Prefix => New_Occurrence_Of (Btyp, Loc),
Attribute_Name => Name_Val,
Expressions => New_List (
Make_Attribute_Reference (Loc,
Prefix =>
New_Occurrence_Of (Standard_Long_Long_Integer, Loc),
Attribute_Name => Name_Value,
Expressions => Args))));
Analyze_And_Resolve (N, Btyp);
-- Normal case where we have enumeration tables, build
-- T'Val
-- (Value_Enumeration_NN
-- (typS, typN'Address, typH'Unrestricted_Access, Num, X))
else
Ttyp := Component_Type (Etype (Lit_Indexes (Rtyp)));
if Ttyp = Standard_Integer_8 then
Vid := RE_Value_Enumeration_8;
elsif Ttyp = Standard_Integer_16 then
Vid := RE_Value_Enumeration_16;
else
Vid := RE_Value_Enumeration_32;
end if;
Prepend_To (Args,
Make_Attribute_Reference (Loc,
Prefix => New_Occurrence_Of (Rtyp, Loc),
Attribute_Name => Name_Pos,
Expressions => New_List (
Make_Attribute_Reference (Loc,
Prefix => New_Occurrence_Of (Rtyp, Loc),
Attribute_Name => Name_Last))));
if Present (Lit_Hash (Rtyp)) then
Prepend_To (Args,
Make_Attribute_Reference (Loc,
Prefix => New_Occurrence_Of (Lit_Hash (Rtyp), Loc),
Attribute_Name => Name_Unrestricted_Access));
else
Prepend_To (Args, Make_Null (Loc));
end if;
Prepend_To (Args,
Make_Attribute_Reference (Loc,
Prefix => New_Occurrence_Of (Lit_Indexes (Rtyp), Loc),
Attribute_Name => Name_Address));
Prepend_To (Args,
New_Occurrence_Of (Lit_Strings (Rtyp), Loc));
Rewrite (N,
Make_Attribute_Reference (Loc,
Prefix => New_Occurrence_Of (Btyp, Loc),
Attribute_Name => Name_Val,
Expressions => New_List (
Make_Function_Call (Loc,
Name =>
New_Occurrence_Of (RTE (Vid), Loc),
Parameter_Associations => Args))));
Analyze_And_Resolve (N, Btyp);
end if;
return;
end if;
-- Compiling package Ada.Tags under No_Run_Time_Mode we disable the
-- expansion of the attribute into the function call statement to avoid
-- generating spurious errors caused by the use of Integer_Address'Value
-- in our implementation of Ada.Tags.Internal_Tag.
if No_Run_Time_Mode
and then Is_RTE (Rtyp, RE_Integer_Address)
and then RTU_Loaded (Ada_Tags)
and then Cunit_Entity (Current_Sem_Unit)
= Body_Entity (RTU_Entity (Ada_Tags))
then
Rewrite (N,
Unchecked_Convert_To (Rtyp,
Make_Integer_Literal (Loc, Uint_0)));
else
Rewrite (N,
Convert_To (Btyp,
Make_Function_Call (Loc,
Name => New_Occurrence_Of (RTE (Vid), Loc),
Parameter_Associations => Args)));
end if;
Analyze_And_Resolve (N, Btyp);
end Expand_Value_Attribute;
---------------------------------
-- Expand_Wide_Image_Attribute --
---------------------------------
-- We expand typ'Wide_Image (X) as follows. First we insert this code:
-- Rnn : Wide_String (1 .. rt'Wide_Width);
-- Lnn : Natural;
-- String_To_Wide_String
-- (typ'Image (Expr), Rnn, Lnn, Wide_Character_Encoding_Method);
-- where rt is the root type of the prefix type
-- Now we replace the Wide_Image reference by
-- Rnn (1 .. Lnn)
-- This works in all cases because String_To_Wide_String converts any
-- wide character escape sequences resulting from the Image call to the
-- proper Wide_Character equivalent
-- not quite right for typ = Wide_Character ???
procedure Expand_Wide_Image_Attribute (N : Node_Id) is
Loc : constant Source_Ptr := Sloc (N);
Pref : constant Entity_Id := Prefix (N);
Rnn : constant Entity_Id := Make_Temporary (Loc, 'S');
Lnn : constant Entity_Id := Make_Temporary (Loc, 'P');
Rtyp : Entity_Id;
begin
if Is_Object_Image (Pref) then
Rewrite_Object_Image (N, Pref, Name_Wide_Image, Standard_Wide_String);
return;
end if;
Rtyp := Root_Type (Entity (Pref));
Insert_Actions (N, New_List (
-- Rnn : Wide_String (1 .. base_typ'Width);
Make_Object_Declaration (Loc,
Defining_Identifier => Rnn,
Object_Definition =>
Make_Subtype_Indication (Loc,
Subtype_Mark =>
New_Occurrence_Of (Standard_Wide_String, Loc),
Constraint =>
Make_Index_Or_Discriminant_Constraint (Loc,
Constraints => New_List (
Make_Range (Loc,
Low_Bound => Make_Integer_Literal (Loc, 1),
High_Bound =>
Make_Attribute_Reference (Loc,
Prefix => New_Occurrence_Of (Rtyp, Loc),
Attribute_Name => Name_Wide_Width)))))),
-- Lnn : Natural;
Make_Object_Declaration (Loc,
Defining_Identifier => Lnn,
Object_Definition => New_Occurrence_Of (Standard_Natural, Loc)),
-- String_To_Wide_String
-- (typ'Image (X), Rnn, Lnn, Wide_Character_Encoding_Method);
Make_Procedure_Call_Statement (Loc,
Name =>
New_Occurrence_Of (RTE (RE_String_To_Wide_String), Loc),
Parameter_Associations => New_List (
Make_Attribute_Reference (Loc,
Prefix => Prefix (N),
Attribute_Name => Name_Image,
Expressions => Expressions (N)),
New_Occurrence_Of (Rnn, Loc),
New_Occurrence_Of (Lnn, Loc),
Make_Integer_Literal (Loc,
Intval => Int (Wide_Character_Encoding_Method))))),
-- Suppress checks because we know everything is properly in range
Suppress => All_Checks);
-- Final step is to rewrite the expression as a slice and analyze,
-- again with no checks, since we are sure that everything is OK.
Rewrite (N,
Make_Slice (Loc,
Prefix => New_Occurrence_Of (Rnn, Loc),
Discrete_Range =>
Make_Range (Loc,
Low_Bound => Make_Integer_Literal (Loc, 1),
High_Bound => New_Occurrence_Of (Lnn, Loc))));
Analyze_And_Resolve (N, Standard_Wide_String, Suppress => All_Checks);
end Expand_Wide_Image_Attribute;
--------------------------------------
-- Expand_Wide_Wide_Image_Attribute --
--------------------------------------
-- We expand typ'Wide_Wide_Image (X) as follows. First we insert this code:
-- Rnn : Wide_Wide_String (1 .. rt'Wide_Wide_Width);
-- Lnn : Natural;
-- String_To_Wide_Wide_String
-- (typ'Image (Expr), Rnn, Lnn, Wide_Character_Encoding_Method);
-- where rt is the root type of the prefix type
-- Now we replace the Wide_Wide_Image reference by
-- Rnn (1 .. Lnn)
-- This works in all cases because String_To_Wide_Wide_String converts any
-- wide character escape sequences resulting from the Image call to the
-- proper Wide_Wide_Character equivalent
-- not quite right for typ = Wide_Wide_Character ???
procedure Expand_Wide_Wide_Image_Attribute (N : Node_Id) is
Loc : constant Source_Ptr := Sloc (N);
Pref : constant Entity_Id := Prefix (N);
Rnn : constant Entity_Id := Make_Temporary (Loc, 'S');
Lnn : constant Entity_Id := Make_Temporary (Loc, 'P');
Rtyp : Entity_Id;
begin
if Is_Object_Image (Pref) then
Rewrite_Object_Image
(N, Pref, Name_Wide_Wide_Image, Standard_Wide_Wide_String);
return;
end if;
Rtyp := Root_Type (Entity (Pref));
Insert_Actions (N, New_List (
-- Rnn : Wide_Wide_String (1 .. rt'Wide_Wide_Width);
Make_Object_Declaration (Loc,
Defining_Identifier => Rnn,
Object_Definition =>
Make_Subtype_Indication (Loc,
Subtype_Mark =>
New_Occurrence_Of (Standard_Wide_Wide_String, Loc),
Constraint =>
Make_Index_Or_Discriminant_Constraint (Loc,
Constraints => New_List (
Make_Range (Loc,
Low_Bound => Make_Integer_Literal (Loc, 1),
High_Bound =>
Make_Attribute_Reference (Loc,
Prefix => New_Occurrence_Of (Rtyp, Loc),
Attribute_Name => Name_Wide_Wide_Width)))))),
-- Lnn : Natural;
Make_Object_Declaration (Loc,
Defining_Identifier => Lnn,
Object_Definition => New_Occurrence_Of (Standard_Natural, Loc)),
-- String_To_Wide_Wide_String
-- (typ'Image (X), Rnn, Lnn, Wide_Character_Encoding_Method);
Make_Procedure_Call_Statement (Loc,
Name =>
New_Occurrence_Of (RTE (RE_String_To_Wide_Wide_String), Loc),
Parameter_Associations => New_List (
Make_Attribute_Reference (Loc,
Prefix => Prefix (N),
Attribute_Name => Name_Image,
Expressions => Expressions (N)),
New_Occurrence_Of (Rnn, Loc),
New_Occurrence_Of (Lnn, Loc),
Make_Integer_Literal (Loc,
Intval => Int (Wide_Character_Encoding_Method))))),
-- Suppress checks because we know everything is properly in range
Suppress => All_Checks);
-- Final step is to rewrite the expression as a slice and analyze,
-- again with no checks, since we are sure that everything is OK.
Rewrite (N,
Make_Slice (Loc,
Prefix => New_Occurrence_Of (Rnn, Loc),
Discrete_Range =>
Make_Range (Loc,
Low_Bound => Make_Integer_Literal (Loc, 1),
High_Bound => New_Occurrence_Of (Lnn, Loc))));
Analyze_And_Resolve
(N, Standard_Wide_Wide_String, Suppress => All_Checks);
end Expand_Wide_Wide_Image_Attribute;
----------------------------
-- Expand_Width_Attribute --
----------------------------
-- The processing here also handles the case of Wide_[Wide_]Width. With the
-- exceptions noted, the processing is identical
-- For scalar types derived from Boolean, character and integer types
-- in package Standard. Note that the Width attribute is computed at
-- compile time for all cases except those involving non-static sub-
-- types. For such subtypes, typ'[Wide_[Wide_]]Width expands into:
-- Result_Type (xx (yy (Ptyp'First), yy (Ptyp'Last)))
-- where
-- For types whose root type is Character
-- xx = Width_Character
-- yy = Character
-- For types whose root type is Wide_Character
-- xx = Wide_Width_Character
-- yy = Character
-- For types whose root type is Wide_Wide_Character
-- xx = Wide_Wide_Width_Character
-- yy = Character
-- For types whose root type is Boolean
-- xx = Width_Boolean
-- yy = Boolean
-- For signed integer types
-- xx = Width_[Long_Long_[Long_]]Integer
-- yy = [Long_Long_[Long_]]Integer
-- For modular integer types
-- xx = Width_[Long_Long_[Long_]]Unsigned
-- yy = [Long_Long_[Long_]]Unsigned
-- For types derived from Wide_Character, typ'Width expands into
-- Result_Type (Width_Wide_Character (
-- Wide_Character (typ'First),
-- Wide_Character (typ'Last),
-- and typ'Wide_Width expands into:
-- Result_Type (Wide_Width_Wide_Character (
-- Wide_Character (typ'First),
-- Wide_Character (typ'Last));
-- and typ'Wide_Wide_Width expands into
-- Result_Type (Wide_Wide_Width_Wide_Character (
-- Wide_Character (typ'First),
-- Wide_Character (typ'Last));
-- For types derived from Wide_Wide_Character, typ'Width expands into
-- Result_Type (Width_Wide_Wide_Character (
-- Wide_Wide_Character (typ'First),
-- Wide_Wide_Character (typ'Last),
-- and typ'Wide_Width expands into:
-- Result_Type (Wide_Width_Wide_Wide_Character (
-- Wide_Wide_Character (typ'First),
-- Wide_Wide_Character (typ'Last));
-- and typ'Wide_Wide_Width expands into
-- Result_Type (Wide_Wide_Width_Wide_Wide_Char (
-- Wide_Wide_Character (typ'First),
-- Wide_Wide_Character (typ'Last));
-- For fixed point types, typ'Width and typ'Wide_[Wide_]Width expand into
-- if Ptyp'First > Ptyp'Last then 0 else Ptyp'Fore + 1 + Ptyp'Aft end if
-- and for floating point types, they expand into
-- if Ptyp'First > Ptyp'Last then 0 else btyp'Width end if
-- where btyp is the base type. This looks recursive but it isn't
-- because the base type is always static, and hence the expression
-- in the else is reduced to an integer literal.
-- For user-defined enumeration types, typ'Width expands into
-- Result_Type (Width_Enumeration_NN
-- (typS,
-- typI'Address,
-- typ'Pos (typ'First),
-- typ'Pos (Typ'Last)));
-- and typ'Wide_Width expands into:
-- Result_Type (Wide_Width_Enumeration_NN
-- (typS,
-- typI,
-- typ'Pos (typ'First),
-- typ'Pos (Typ'Last))
-- Wide_Character_Encoding_Method);
-- and typ'Wide_Wide_Width expands into:
-- Result_Type (Wide_Wide_Width_Enumeration_NN
-- (typS,
-- typI,
-- typ'Pos (typ'First),
-- typ'Pos (Typ'Last))
-- Wide_Character_Encoding_Method);
-- where typS and typI are the enumeration image strings and indexes
-- table, as described in Build_Enumeration_Image_Tables. NN is 8/16/32
-- for depending on the element type for typI.
-- Finally if Discard_Names is in effect for an enumeration type, then
-- a special if expression is built that yields the space needed for the
-- decimal representation of the largest pos value in the subtype. See
-- code below for details.
procedure Expand_Width_Attribute (N : Node_Id; Attr : Atype := Normal) is
Loc : constant Source_Ptr := Sloc (N);
Typ : constant Entity_Id := Etype (N);
Pref : constant Node_Id := Prefix (N);
Ptyp : constant Entity_Id := Etype (Pref);
Rtyp : constant Entity_Id := Root_Type (Ptyp);
Arglist : List_Id;
Ttyp : Entity_Id;
XX : RE_Id;
YY : Entity_Id;
begin
-- Types derived from Standard.Boolean
if Rtyp = Standard_Boolean then
XX := RE_Width_Boolean;
YY := Rtyp;
-- Types derived from Standard.Character
elsif Rtyp = Standard_Character then
case Attr is
when Normal => XX := RE_Width_Character;
when Wide => XX := RE_Wide_Width_Character;
when Wide_Wide => XX := RE_Wide_Wide_Width_Character;
end case;
YY := Rtyp;
-- Types derived from Standard.Wide_Character
elsif Rtyp = Standard_Wide_Character then
case Attr is
when Normal => XX := RE_Width_Wide_Character;
when Wide => XX := RE_Wide_Width_Wide_Character;
when Wide_Wide => XX := RE_Wide_Wide_Width_Wide_Character;
end case;
YY := Rtyp;
-- Types derived from Standard.Wide_Wide_Character
elsif Rtyp = Standard_Wide_Wide_Character then
case Attr is
when Normal => XX := RE_Width_Wide_Wide_Character;
when Wide => XX := RE_Wide_Width_Wide_Wide_Character;
when Wide_Wide => XX := RE_Wide_Wide_Width_Wide_Wide_Char;
end case;
YY := Rtyp;
-- Signed integer types
elsif Is_Signed_Integer_Type (Rtyp) then
if Esize (Rtyp) <= Standard_Integer_Size then
XX := RE_Width_Integer;
YY := Standard_Integer;
elsif Esize (Rtyp) <= Standard_Long_Long_Integer_Size then
XX := RE_Width_Long_Long_Integer;
YY := Standard_Long_Long_Integer;
else
XX := RE_Width_Long_Long_Long_Integer;
YY := Standard_Long_Long_Long_Integer;
end if;
-- Modular integer types
elsif Is_Modular_Integer_Type (Rtyp) then
if Modulus (Rtyp) <= Modulus (RTE (RE_Unsigned)) then
XX := RE_Width_Unsigned;
YY := RTE (RE_Unsigned);
elsif Modulus (Rtyp) <= Modulus (RTE (RE_Long_Long_Unsigned)) then
XX := RE_Width_Long_Long_Unsigned;
YY := RTE (RE_Long_Long_Unsigned);
else
XX := RE_Width_Long_Long_Long_Unsigned;
YY := RTE (RE_Long_Long_Long_Unsigned);
end if;
-- Fixed point types
elsif Is_Fixed_Point_Type (Rtyp) then
Rewrite (N,
Make_If_Expression (Loc,
Expressions => New_List (
Make_Op_Gt (Loc,
Left_Opnd =>
Make_Attribute_Reference (Loc,
Prefix => New_Occurrence_Of (Ptyp, Loc),
Attribute_Name => Name_First),
Right_Opnd =>
Make_Attribute_Reference (Loc,
Prefix => New_Occurrence_Of (Ptyp, Loc),
Attribute_Name => Name_Last)),
Make_Integer_Literal (Loc, 0),
Make_Op_Add (Loc,
Make_Attribute_Reference (Loc,
Prefix => New_Occurrence_Of (Ptyp, Loc),
Attribute_Name => Name_Fore),
Make_Op_Add (Loc,
Make_Integer_Literal (Loc, 1),
Make_Integer_Literal (Loc, Aft_Value (Ptyp)))))));
Analyze_And_Resolve (N, Typ);
return;
-- Floating point types
elsif Is_Floating_Point_Type (Rtyp) then
Rewrite (N,
Make_If_Expression (Loc,
Expressions => New_List (
Make_Op_Gt (Loc,
Left_Opnd =>
Make_Attribute_Reference (Loc,
Prefix => New_Occurrence_Of (Ptyp, Loc),
Attribute_Name => Name_First),
Right_Opnd =>
Make_Attribute_Reference (Loc,
Prefix => New_Occurrence_Of (Ptyp, Loc),
Attribute_Name => Name_Last)),
Make_Integer_Literal (Loc, 0),
Make_Attribute_Reference (Loc,
Prefix => New_Occurrence_Of (Base_Type (Ptyp), Loc),
Attribute_Name => Name_Width))));
Analyze_And_Resolve (N, Typ);
return;
-- User-defined enumeration types
else
pragma Assert (Is_Enumeration_Type (Rtyp));
-- Whenever pragma Discard_Names is in effect, the value we need
-- is the value needed to accommodate the largest integer pos value
-- in the range of the subtype + 1 for the space at the start. We
-- build:
-- Tnn : constant Integer := Rtyp'Pos (Ptyp'Last)
-- and replace the expression by
-- (if Ptyp'Range_Length = 0 then 0
-- else (if Tnn < 10 then 2
-- else (if Tnn < 100 then 3
-- ...
-- else n)))...
-- where n is equal to Rtyp'Pos (Ptyp'Last) + 1
-- Note: The above processing is in accordance with the intent of
-- the RM, which is that Width should be related to the impl-defined
-- behavior of Image. It is not clear what this means if Image is
-- not defined (as in the configurable run-time case for GNAT) and
-- gives an error at compile time.
-- We choose in this case to just go ahead and implement Width the
-- same way, returning what Image would have returned if it has been
-- available in the configurable run-time library.
if Discard_Names (Rtyp) then
declare
Tnn : constant Entity_Id := Make_Temporary (Loc, 'T');
Cexpr : Node_Id;
P : Int;
M : Int;
K : Int;
begin
Insert_Action (N,
Make_Object_Declaration (Loc,
Defining_Identifier => Tnn,
Constant_Present => True,
Object_Definition =>
New_Occurrence_Of (Standard_Integer, Loc),
Expression =>
Make_Attribute_Reference (Loc,
Prefix => New_Occurrence_Of (Rtyp, Loc),
Attribute_Name => Name_Pos,
Expressions => New_List (
Convert_To (Rtyp,
Make_Attribute_Reference (Loc,
Prefix => New_Occurrence_Of (Ptyp, Loc),
Attribute_Name => Name_Last))))));
-- OK, now we need to build the if expression. First get the
-- value of M, the largest possible value needed.
P := UI_To_Int
(Enumeration_Pos (Entity (Type_High_Bound (Rtyp))));
K := 1;
M := 1;
while M < P loop
M := M * 10;
K := K + 1;
end loop;
-- Build inner else
Cexpr := Make_Integer_Literal (Loc, K);
-- Wrap in inner if's until counted down to 2
while K > 2 loop
M := M / 10;
K := K - 1;
Cexpr :=
Make_If_Expression (Loc,
Expressions => New_List (
Make_Op_Lt (Loc,
Left_Opnd => New_Occurrence_Of (Tnn, Loc),
Right_Opnd => Make_Integer_Literal (Loc, M)),
Make_Integer_Literal (Loc, K),
Cexpr));
end loop;
-- Add initial comparison for null range and we are done, so
-- rewrite the attribute occurrence with this expression.
Rewrite (N,
Convert_To (Typ,
Make_If_Expression (Loc,
Expressions => New_List (
Make_Op_Eq (Loc,
Left_Opnd =>
Make_Attribute_Reference (Loc,
Prefix => New_Occurrence_Of (Ptyp, Loc),
Attribute_Name => Name_Range_Length),
Right_Opnd => Make_Integer_Literal (Loc, 0)),
Make_Integer_Literal (Loc, 0),
Cexpr))));
Analyze_And_Resolve (N, Typ);
return;
end;
end if;
-- Normal case, not Discard_Names
Ttyp := Component_Type (Etype (Lit_Indexes (Rtyp)));
case Attr is
when Normal =>
if Ttyp = Standard_Integer_8 then
XX := RE_Width_Enumeration_8;
elsif Ttyp = Standard_Integer_16 then
XX := RE_Width_Enumeration_16;
else
XX := RE_Width_Enumeration_32;
end if;
when Wide =>
if Ttyp = Standard_Integer_8 then
XX := RE_Wide_Width_Enumeration_8;
elsif Ttyp = Standard_Integer_16 then
XX := RE_Wide_Width_Enumeration_16;
else
XX := RE_Wide_Width_Enumeration_32;
end if;
when Wide_Wide =>
if Ttyp = Standard_Integer_8 then
XX := RE_Wide_Wide_Width_Enumeration_8;
elsif Ttyp = Standard_Integer_16 then
XX := RE_Wide_Wide_Width_Enumeration_16;
else
XX := RE_Wide_Wide_Width_Enumeration_32;
end if;
end case;
Arglist :=
New_List (
New_Occurrence_Of (Lit_Strings (Rtyp), Loc),
Make_Attribute_Reference (Loc,
Prefix => New_Occurrence_Of (Lit_Indexes (Rtyp), Loc),
Attribute_Name => Name_Address),
Make_Attribute_Reference (Loc,
Prefix => New_Occurrence_Of (Ptyp, Loc),
Attribute_Name => Name_Pos,
Expressions => New_List (
Make_Attribute_Reference (Loc,
Prefix => New_Occurrence_Of (Ptyp, Loc),
Attribute_Name => Name_First))),
Make_Attribute_Reference (Loc,
Prefix => New_Occurrence_Of (Ptyp, Loc),
Attribute_Name => Name_Pos,
Expressions => New_List (
Make_Attribute_Reference (Loc,
Prefix => New_Occurrence_Of (Ptyp, Loc),
Attribute_Name => Name_Last))));
Rewrite (N,
Convert_To (Typ,
Make_Function_Call (Loc,
Name => New_Occurrence_Of (RTE (XX), Loc),
Parameter_Associations => Arglist)));
Analyze_And_Resolve (N, Typ);
return;
end if;
-- If we fall through XX and YY are set
Arglist := New_List (
Convert_To (YY,
Make_Attribute_Reference (Loc,
Prefix => New_Occurrence_Of (Ptyp, Loc),
Attribute_Name => Name_First)),
Convert_To (YY,
Make_Attribute_Reference (Loc,
Prefix => New_Occurrence_Of (Ptyp, Loc),
Attribute_Name => Name_Last)));
Rewrite (N,
Convert_To (Typ,
Make_Function_Call (Loc,
Name => New_Occurrence_Of (RTE (XX), Loc),
Parameter_Associations => Arglist)));
Analyze_And_Resolve (N, Typ);
end Expand_Width_Attribute;
--------------------------
-- Rewrite_Object_Image --
--------------------------
procedure Rewrite_Object_Image
(N : Node_Id;
Pref : Entity_Id;
Attr_Name : Name_Id;
Str_Typ : Entity_Id)
is
begin
Rewrite (N,
Make_Attribute_Reference (Sloc (N),
Prefix => New_Occurrence_Of (Etype (Pref), Sloc (N)),
Attribute_Name => Attr_Name,
Expressions => New_List (Relocate_Node (Pref))));
Analyze_And_Resolve (N, Str_Typ);
end Rewrite_Object_Image;
end Exp_Imgv;