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------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- E X P _ I M G V --
-- --
-- B o d y --
-- --
-- Copyright (C) 2001-2014, 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 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 Rtsfind; use Rtsfind;
with Sem_Aux; use Sem_Aux;
with Sem_Res; use Sem_Res;
with Sinfo; use Sinfo;
with Snames; use Snames;
with Stand; use Stand;
with Stringt; use Stringt;
with Tbuild; use Tbuild;
with Ttypes; use Ttypes;
with Uintp; use Uintp;
with Urealp; use Urealp;
package body Exp_Imgv is
function Has_Decimal_Small (E : Entity_Id) return Boolean;
-- Applies to all entities. True for a Decimal_Fixed_Point_Type, or an
-- Ordinary_Fixed_Point_Type with a small that is a negative power of ten.
-- Shouldn't this be in einfo.adb or sem_aux.adb???
------------------------------------
-- Build_Enumeration_Image_Tables --
------------------------------------
procedure Build_Enumeration_Image_Tables (E : Entity_Id; N : Node_Id) is
Loc : constant Source_Ptr := Sloc (E);
Str : String_Id;
Ind : List_Id;
Lit : Entity_Id;
Nlit : Nat;
Len : Nat;
Estr : Entity_Id;
Eind : Entity_Id;
Ityp : Node_Id;
begin
-- Nothing to do for 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;
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));
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);
Insert_Actions (N,
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)),
Make_Object_Declaration (Loc,
Defining_Identifier => Eind,
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, Nlit))),
Component_Definition =>
Make_Component_Definition (Loc,
Aliased_Present => False,
Subtype_Indication => New_Occurrence_Of (Ityp, Loc))),
Expression =>
Make_Aggregate (Loc,
Expressions => Ind))),
Suppress => All_Checks);
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 with size <= Integer'Size
-- xx = Integer
-- tv = Integer (Expr)
-- For other signed integer types
-- xx = Long_Long_Integer
-- tv = Long_Long_Integer (Expr)
-- For modular types with modulus <= System.Unsigned_Types.Unsigned
-- xx = Unsigned
-- tv = System.Unsigned_Types.Unsigned (Expr)
-- For other modular integer types
-- xx = Long_Long_Unsigned
-- tv = System.Unsigned_Types.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 ordinary fixed-point types
-- xx = Ordinary_Fixed_Point
-- tv = Long_Long_Float (Expr)
-- pm = typ'Aft (typ = subtype of expression)
-- For decimal fixed-point types with size = Integer'Size
-- xx = Decimal
-- tv = Integer (Expr)
-- pm = typ'Scale (typ = subtype of expression)
-- For decimal fixed-point types with size > Integer'Size
-- xx = Long_Long_Decimal
-- tv = Long_Long_Integer?(Expr) [convert with no scaling]
-- pm = typ'Scale (typ = subtype of expression)
-- For enumeration types other than those declared packages 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);
Pref : constant Node_Id := Prefix (N);
Ptyp : constant Entity_Id := Entity (Pref);
Rtyp : constant Entity_Id := Root_Type (Ptyp);
Expr : constant Node_Id := Relocate_Node (First (Exprs));
Imid : RE_Id;
Tent : Entity_Id;
Ttyp : Entity_Id;
Proc_Ent : Entity_Id;
Enum_Case : Boolean;
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');
begin
-- 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)));
-- 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
Imid := RE_Image_Boolean;
Tent := Rtyp;
-- 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) <= Esize (Standard_Integer) then
Imid := RE_Image_Integer;
Tent := Standard_Integer;
else
Imid := RE_Image_Long_Long_Integer;
Tent := Standard_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);
else
Imid := RE_Image_Long_Long_Unsigned;
Tent := RTE (RE_Long_Long_Unsigned);
end if;
elsif Is_Fixed_Point_Type (Rtyp) and then Has_Decimal_Small (Rtyp) then
if UI_To_Int (Esize (Rtyp)) <= Standard_Integer_Size then
Imid := RE_Image_Decimal;
Tent := Standard_Integer;
else
Imid := RE_Image_Long_Long_Decimal;
Tent := Standard_Long_Long_Integer;
end if;
elsif Is_Ordinary_Fixed_Point_Type (Rtyp) then
Imid := RE_Image_Ordinary_Fixed_Point;
Tent := Standard_Long_Long_Float;
elsif Is_Floating_Point_Type (Rtyp) then
Imid := RE_Image_Floating_Point;
Tent := Standard_Long_Long_Float;
-- Only other possibility is user defined enumeration type
else
if Discard_Names (First_Subtype (Ptyp))
or else No (Lit_Strings (Root_Type (Ptyp)))
then
-- When pragma Discard_Names applies to the first subtype, build
-- (Pref'Pos (Expr))'Img.
Rewrite (N,
Make_Attribute_Reference (Loc,
Prefix =>
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;
else
-- Here for enumeration type case
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)));
else
Arg_List := New_List (Convert_To (Tent, Expr));
end if;
-- 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 ordinary fixed-point types, append Aft parameter
elsif Is_Ordinary_Fixed_Point_Type (Rtyp) then
Append_To (Arg_List,
Make_Attribute_Reference (Loc,
Prefix => New_Occurrence_Of (Ptyp, Loc),
Attribute_Name => Name_Aft));
if Has_Decimal_Small (Rtyp) then
Set_Conversion_OK (First (Arg_List));
Set_Etype (First (Arg_List), Tent);
end if;
-- For decimal, append Scale and also set to do literal conversion
elsif Is_Decimal_Fixed_Point_Type (Rtyp) then
Append_To (Arg_List,
Make_Attribute_Reference (Loc,
Prefix => New_Occurrence_Of (Ptyp, Loc),
Attribute_Name => Name_Scale));
Set_Conversion_OK (First (Arg_List));
Set_Etype (First (Arg_List), Tent);
-- 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_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 he 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 with size <= Integer'Size
-- xx = Integer
-- For other signed integer types
-- xx = Long_Long_Integer
-- For modular types with modulus <= System.Unsigned_Types.Unsigned
-- xx = Unsigned
-- For other modular integer types
-- xx = Long_Long_Unsigned
-- For floating-point types and ordinary fixed-point types
-- xx = Real
-- 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 decimal types with size <= Integer'Size, typ'Value (X)
-- expands into
-- btyp?(Value_Decimal (X, typ'Scale));
-- For all other decimal types, typ'Value (X) expands into
-- btyp?(Value_Long_Long_Decimal (X, typ'Scale))
-- 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, typI'Address, Num, X))
-- where typS and typI and the Lit_Strings and Lit_Indexes 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 typI.
procedure Expand_Value_Attribute (N : Node_Id) is
Loc : constant Source_Ptr := Sloc (N);
Typ : constant Entity_Id := Etype (N);
Btyp : constant Entity_Id := Base_Type (Typ);
Rtyp : constant Entity_Id := Root_Type (Typ);
Exprs : constant List_Id := Expressions (N);
Vid : RE_Id;
Args : List_Id;
Func : RE_Id;
Ttyp : Entity_Id;
begin
Args := Exprs;
if Rtyp = Standard_Character then
Vid := RE_Value_Character;
elsif Rtyp = Standard_Boolean then
Vid := RE_Value_Boolean;
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 Rtyp = Base_Type (Standard_Short_Short_Integer)
or else Rtyp = Base_Type (Standard_Short_Integer)
or else Rtyp = Base_Type (Standard_Integer)
then
Vid := RE_Value_Integer;
elsif Is_Signed_Integer_Type (Rtyp) then
Vid := RE_Value_Long_Long_Integer;
elsif Is_Modular_Integer_Type (Rtyp) then
if Modulus (Rtyp) <= Modulus (RTE (RE_Unsigned)) then
Vid := RE_Value_Unsigned;
else
Vid := RE_Value_Long_Long_Unsigned;
end if;
elsif Is_Decimal_Fixed_Point_Type (Rtyp) then
if UI_To_Int (Esize (Rtyp)) <= Standard_Integer_Size then
Vid := RE_Value_Decimal;
else
Vid := RE_Value_Long_Long_Decimal;
end if;
Append_To (Args,
Make_Attribute_Reference (Loc,
Prefix => New_Occurrence_Of (Typ, Loc),
Attribute_Name => Name_Scale));
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_Real_Type (Rtyp) then
Vid := RE_Value_Real;
-- 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 (Typ))
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);
-- Here for normal case where we have enumeration tables, this
-- is where we build
-- T'Val (Value_Enumeration_NN (typS, typI'Address, Num, X))
else
Ttyp := Component_Type (Etype (Lit_Indexes (Rtyp)));
if Ttyp = Standard_Integer_8 then
Func := RE_Value_Enumeration_8;
elsif Ttyp = Standard_Integer_16 then
Func := RE_Value_Enumeration_16;
else
Func := 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))));
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 (Typ, Loc),
Attribute_Name => Name_Val,
Expressions => New_List (
Make_Function_Call (Loc,
Name =>
New_Occurrence_Of (RTE (Func), Loc),
Parameter_Associations => Args))));
Analyze_And_Resolve (N, Btyp);
end if;
return;
end if;
-- 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.
-- 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
-- Seems like a bit of a odd approach, there should be a better way ???
-- There is a better way, test RTE_Available ???
if No_Run_Time_Mode
and then Rtyp = RTE (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);
Rtyp : constant Entity_Id := Root_Type (Entity (Prefix (N)));
Rnn : constant Entity_Id := Make_Temporary (Loc, 'S');
Lnn : constant Entity_Id := Make_Temporary (Loc, 'P');
begin
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);
Rtyp : constant Entity_Id := Root_Type (Entity (Prefix (N)));
Rnn : constant Entity_Id := Make_Temporary (Loc, 'S');
Lnn : constant Entity_Id := Make_Temporary (Loc, 'P');
begin
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_Integer
-- yy = Long_Long_Integer
-- For modular integer types
-- xx = Width_Long_Long_Unsigned
-- yy = 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 real types, typ'Width and typ'Wide_[Wide_]Width 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
XX := RE_Width_Long_Long_Integer;
YY := Standard_Long_Long_Integer;
-- Modular integer types
elsif Is_Modular_Integer_Type (Rtyp) then
XX := RE_Width_Long_Long_Unsigned;
YY := RTE (RE_Long_Long_Unsigned);
-- Real types
elsif Is_Real_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 accomodate 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;
-----------------------
-- Has_Decimal_Small --
-----------------------
function Has_Decimal_Small (E : Entity_Id) return Boolean is
begin
return Is_Decimal_Fixed_Point_Type (E)
or else
(Is_Ordinary_Fixed_Point_Type (E)
and then Ureal_10**Aft_Value (E) * Small_Value (E) = Ureal_1);
end Has_Decimal_Small;
end Exp_Imgv;