------------------------------------------------------------------------------
--- c --
+-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- S E M _ C H 1 3 --
-- --
-- B o d y --
-- --
--- Copyright (C) 1992-2004, Free Software Foundation, Inc. --
+-- Copyright (C) 1992-2006, 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- --
-- 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 COPYING. If not, write --
--- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
--- MA 02111-1307, USA. --
+-- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
+-- Boston, MA 02110-1301, USA. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
with Sem_Res; use Sem_Res;
with Sem_Type; use Sem_Type;
with Sem_Util; use Sem_Util;
+with Sem_Warn; use Sem_Warn;
with Snames; use Snames;
with Stand; use Stand;
with Sinfo; use Sinfo;
-- the expression N is of the form of K'Address, then the entity that
-- is associated with K is marked as volatile.
- procedure New_Stream_Function
+ procedure New_Stream_Subprogram
(N : Node_Id;
Ent : Entity_Id;
Subp : Entity_Id;
Nam : TSS_Name_Type);
- -- Create a function renaming of a given stream attribute to the
- -- designated subprogram and then in the tagged case, provide this as
- -- a primitive operation, or in the non-tagged case make an appropriate
- -- TSS entry. Used for Input. This is more properly an expansion activity
- -- than just semantics, but the presence of user-defined stream functions
- -- for limited types is a legality check, which is why this takes place
- -- here rather than in exp_ch13, where it was previously. Nam indicates
- -- the name of the TSS function to be generated.
+ -- Create a subprogram renaming of a given stream attribute to the
+ -- designated subprogram and then in the tagged case, provide this as a
+ -- primitive operation, or in the non-tagged case make an appropriate TSS
+ -- entry. This is more properly an expansion activity than just semantics,
+ -- but the presence of user-defined stream functions for limited types is a
+ -- legality check, which is why this takes place here rather than in
+ -- exp_ch13, where it was previously. Nam indicates the name of the TSS
+ -- function to be generated.
--
-- To avoid elaboration anomalies with freeze nodes, for untagged types
-- we generate both a subprogram declaration and a subprogram renaming
-- renaming_as_body. For tagged types, the specification is one of the
-- primitive specs.
- procedure New_Stream_Procedure
- (N : Node_Id;
- Ent : Entity_Id;
- Subp : Entity_Id;
- Nam : TSS_Name_Type;
- Out_P : Boolean := False);
- -- Create a procedure renaming of a given stream attribute to the
- -- designated subprogram and then in the tagged case, provide this as
- -- a primitive operation, or in the non-tagged case make an appropriate
- -- TSS entry. Used for Read, Output, Write. Nam indicates the name of
- -- the TSS procedure to be generated.
-
----------------------------------------------
-- Table for Validate_Unchecked_Conversions --
----------------------------------------------
return Empty;
end Address_Aliased_Entity;
+ -----------------------------------------
+ -- Adjust_Record_For_Reverse_Bit_Order --
+ -----------------------------------------
+
+ procedure Adjust_Record_For_Reverse_Bit_Order (R : Entity_Id) is
+ Max_Machine_Scalar_Size : constant Uint :=
+ UI_From_Int
+ (Standard_Long_Long_Integer_Size);
+ -- We use this as the maximum machine scalar size in the sense of AI-133
+
+ Num_CC : Natural;
+ Comp : Entity_Id;
+ SSU : constant Uint := UI_From_Int (System_Storage_Unit);
+
+ begin
+ -- This first loop through components does two things. First it deals
+ -- with the case of components with component clauses whose length is
+ -- greater than the maximum machine scalar size (either accepting them
+ -- or rejecting as needed). Second, it counts the number of components
+ -- with component clauses whose length does not exceed this maximum for
+ -- later processing.
+
+ Num_CC := 0;
+ Comp := First_Component_Or_Discriminant (R);
+ while Present (Comp) loop
+ declare
+ CC : constant Node_Id := Component_Clause (Comp);
+ Fbit : constant Uint := Static_Integer (First_Bit (CC));
+
+ begin
+ if Present (CC) then
+
+ -- Case of component with size > max machine scalar
+
+ if Esize (Comp) > Max_Machine_Scalar_Size then
+
+ -- Must begin on byte boundary
+
+ if Fbit mod SSU /= 0 then
+ Error_Msg_N
+ ("illegal first bit value for reverse bit order",
+ First_Bit (CC));
+ Error_Msg_Uint_1 := SSU;
+ Error_Msg_Uint_2 := Max_Machine_Scalar_Size;
+
+ Error_Msg_N
+ ("\must be a multiple of ^ if size greater than ^",
+ First_Bit (CC));
+
+ -- Must end on byte boundary
+
+ elsif Esize (Comp) mod SSU /= 0 then
+ Error_Msg_N
+ ("illegal last bit value for reverse bit order",
+ Last_Bit (CC));
+ Error_Msg_Uint_1 := SSU;
+ Error_Msg_Uint_2 := Max_Machine_Scalar_Size;
+
+ Error_Msg_N
+ ("\must be a multiple of ^ if size greater than ^",
+ Last_Bit (CC));
+
+ -- OK, give warning if enabled
+
+ elsif Warn_On_Reverse_Bit_Order then
+ Error_Msg_N
+ ("multi-byte field specified with non-standard"
+ & " Bit_Order?", CC);
+
+ if Bytes_Big_Endian then
+ Error_Msg_N
+ ("\bytes are not reversed "
+ & "(component is big-endian)?", CC);
+ else
+ Error_Msg_N
+ ("\bytes are not reversed "
+ & "(component is little-endian)?", CC);
+ end if;
+ end if;
+
+ -- Case where size is not greater than max machine scalar.
+ -- For now, we just count these.
+
+ else
+ Num_CC := Num_CC + 1;
+ end if;
+ end if;
+ end;
+
+ Next_Component_Or_Discriminant (Comp);
+ end loop;
+
+ -- We need to sort the component clauses on the basis of the Position
+ -- values in the clause, so we can group clauses with the same Position
+ -- together to determine the relevant machine scalar size.
+
+ declare
+ Comps : array (0 .. Num_CC) of Entity_Id;
+ -- Array to collect component and discrimninant entities. The data
+ -- starts at index 1, the 0'th entry is for GNAT.Heap_Sort_A.
+
+ function CP_Lt (Op1, Op2 : Natural) return Boolean;
+ -- Compare routine for Sort (See GNAT.Heap_Sort_A)
+
+ procedure CP_Move (From : Natural; To : Natural);
+ -- Move routine for Sort (see GNAT.Heap_Sort_A)
+
+ Start : Natural;
+ Stop : Natural;
+ -- Start and stop positions in component list of set of components
+ -- with the same starting position (that constitute components in
+ -- a single machine scalar).
+
+ MaxL : Uint;
+ -- Maximum last bit value of any component in this set
+
+ MSS : Uint;
+ -- Corresponding machine scalar size
+
+ -----------
+ -- CP_Lt --
+ -----------
+
+ function CP_Lt (Op1, Op2 : Natural) return Boolean is
+ begin
+ return Position (Component_Clause (Comps (Op1))) <
+ Position (Component_Clause (Comps (Op2)));
+ end CP_Lt;
+
+ -------------
+ -- CP_Move --
+ -------------
+
+ procedure CP_Move (From : Natural; To : Natural) is
+ begin
+ Comps (To) := Comps (From);
+ end CP_Move;
+
+ begin
+ -- Collect the component clauses
+
+ Num_CC := 0;
+ Comp := First_Component_Or_Discriminant (R);
+ while Present (Comp) loop
+ if Present (Component_Clause (Comp))
+ and then Esize (Comp) <= Max_Machine_Scalar_Size
+ then
+ Num_CC := Num_CC + 1;
+ Comps (Num_CC) := Comp;
+ end if;
+
+ Next_Component_Or_Discriminant (Comp);
+ end loop;
+
+ -- Sort by ascending position number
+
+ Sort (Num_CC, CP_Move'Unrestricted_Access, CP_Lt'Unrestricted_Access);
+
+ -- We now have all the components whose size does not exceed the max
+ -- machine scalar value, sorted by starting position. In this loop
+ -- we gather groups of clauses starting at the same position, to
+ -- process them in accordance with Ada 2005 AI-133.
+
+ Stop := 0;
+ while Stop < Num_CC loop
+ Start := Stop + 1;
+ Stop := Start;
+ MaxL :=
+ Static_Integer (Last_Bit (Component_Clause (Comps (Start))));
+ while Stop < Num_CC loop
+ if Static_Integer
+ (Position (Component_Clause (Comps (Stop + 1)))) =
+ Static_Integer
+ (Position (Component_Clause (Comps (Stop))))
+ then
+ Stop := Stop + 1;
+ MaxL :=
+ UI_Max
+ (MaxL,
+ Static_Integer
+ (Last_Bit (Component_Clause (Comps (Stop)))));
+ else
+ exit;
+ end if;
+ end loop;
+
+ -- Now we have a group of component clauses from Start to Stop
+ -- whose positions are identical, and MaxL is the maximum last bit
+ -- value of any of these components.
+
+ -- We need to determine the corresponding machine scalar size.
+ -- This loop assumes that machine scalar sizes are even, and that
+ -- each possible machine scalar has twice as many bits as the
+ -- next smaller one.
+
+ MSS := Max_Machine_Scalar_Size;
+ while MSS mod 2 = 0
+ and then (MSS / 2) >= SSU
+ and then (MSS / 2) > MaxL
+ loop
+ MSS := MSS / 2;
+ end loop;
+
+ -- Here is where we fix up the Component_Bit_Offset value to
+ -- account for the reverse bit order. Some examples of what needs
+ -- to be done for the case of a machine scalar size of 8 are:
+
+ -- First_Bit .. Last_Bit Component_Bit_Offset
+ -- old new old new
+
+ -- 0 .. 0 7 .. 7 0 7
+ -- 0 .. 1 6 .. 7 0 6
+ -- 0 .. 2 5 .. 7 0 5
+ -- 0 .. 7 0 .. 7 0 4
+
+ -- 1 .. 1 6 .. 6 1 6
+ -- 1 .. 4 3 .. 6 1 3
+ -- 4 .. 7 0 .. 3 4 0
+
+ -- The general rule is that the first bit is is obtained by
+ -- subtracting the old ending bit from machine scalar size - 1.
+
+ for C in Start .. Stop loop
+ declare
+ Comp : constant Entity_Id := Comps (C);
+ CC : constant Node_Id := Component_Clause (Comp);
+ LB : constant Uint := Static_Integer (Last_Bit (CC));
+ NFB : constant Uint := MSS - Uint_1 - LB;
+ NLB : constant Uint := NFB + Esize (Comp) - 1;
+ Pos : constant Uint := Static_Integer (Position (CC));
+
+ begin
+ if Warn_On_Reverse_Bit_Order then
+ Error_Msg_Uint_1 := MSS;
+ Error_Msg_N
+ ("?reverse bit order in machine " &
+ "scalar of length^", First_Bit (CC));
+ Error_Msg_Uint_1 := NFB;
+ Error_Msg_Uint_2 := NLB;
+
+ if Bytes_Big_Endian then
+ Error_Msg_NE
+ ("?\big-endian range for component & is ^ .. ^",
+ First_Bit (CC), Comp);
+ else
+ Error_Msg_NE
+ ("?\little-endian range for component & is ^ .. ^",
+ First_Bit (CC), Comp);
+ end if;
+ end if;
+
+ Set_Component_Bit_Offset (Comp, Pos * SSU + NFB);
+ Set_Normalized_First_Bit (Comp, NFB mod SSU);
+ end;
+ end loop;
+ end loop;
+ end;
+ end Adjust_Record_For_Reverse_Bit_Order;
+
--------------------------------------
-- Alignment_Check_For_Esize_Change --
--------------------------------------
-- disallow Storage_Size for derived task types, but that is also
-- clearly unintentional.
+ procedure Analyze_Stream_TSS_Definition (TSS_Nam : TSS_Name_Type);
+ -- Common processing for 'Read, 'Write, 'Input and 'Output attribute
+ -- definition clauses.
+
+ procedure Analyze_Stream_TSS_Definition (TSS_Nam : TSS_Name_Type) is
+ Subp : Entity_Id := Empty;
+ I : Interp_Index;
+ It : Interp;
+ Pnam : Entity_Id;
+
+ Is_Read : constant Boolean := (TSS_Nam = TSS_Stream_Read);
+
+ function Has_Good_Profile (Subp : Entity_Id) return Boolean;
+ -- Return true if the entity is a subprogram with an appropriate
+ -- profile for the attribute being defined.
+
+ ----------------------
+ -- Has_Good_Profile --
+ ----------------------
+
+ function Has_Good_Profile (Subp : Entity_Id) return Boolean is
+ F : Entity_Id;
+ Is_Function : constant Boolean := (TSS_Nam = TSS_Stream_Input);
+ Expected_Ekind : constant array (Boolean) of Entity_Kind :=
+ (False => E_Procedure, True => E_Function);
+ Typ : Entity_Id;
+
+ begin
+ if Ekind (Subp) /= Expected_Ekind (Is_Function) then
+ return False;
+ end if;
+
+ F := First_Formal (Subp);
+
+ if No (F)
+ or else Ekind (Etype (F)) /= E_Anonymous_Access_Type
+ or else Designated_Type (Etype (F)) /=
+ Class_Wide_Type (RTE (RE_Root_Stream_Type))
+ then
+ return False;
+ end if;
+
+ if not Is_Function then
+ Next_Formal (F);
+
+ declare
+ Expected_Mode : constant array (Boolean) of Entity_Kind :=
+ (False => E_In_Parameter,
+ True => E_Out_Parameter);
+ begin
+ if Parameter_Mode (F) /= Expected_Mode (Is_Read) then
+ return False;
+ end if;
+ end;
+
+ Typ := Etype (F);
+
+ else
+ Typ := Etype (Subp);
+ end if;
+
+ return Base_Type (Typ) = Base_Type (Ent)
+ and then No (Next_Formal (F));
+
+ end Has_Good_Profile;
+
+ -- Start of processing for Analyze_Stream_TSS_Definition
+
+ begin
+ FOnly := True;
+
+ if not Is_Type (U_Ent) then
+ Error_Msg_N ("local name must be a subtype", Nam);
+ return;
+ end if;
+
+ Pnam := TSS (Base_Type (U_Ent), TSS_Nam);
+
+ -- If Pnam is present, it can be either inherited from an ancestor
+ -- type (in which case it is legal to redefine it for this type), or
+ -- be a previous definition of the attribute for the same type (in
+ -- which case it is illegal).
+
+ -- In the first case, it will have been analyzed already, and we
+ -- can check that its profile does not match the expected profile
+ -- for a stream attribute of U_Ent. In the second case, either Pnam
+ -- has been analyzed (and has the expected profile), or it has not
+ -- been analyzed yet (case of a type that has not been frozen yet
+ -- and for which the stream attribute has been set using Set_TSS).
+
+ if Present (Pnam)
+ and then (No (First_Entity (Pnam)) or else Has_Good_Profile (Pnam))
+ then
+ Error_Msg_Sloc := Sloc (Pnam);
+ Error_Msg_Name_1 := Attr;
+ Error_Msg_N ("% attribute already defined #", Nam);
+ return;
+ end if;
+
+ Analyze (Expr);
+
+ if Is_Entity_Name (Expr) then
+ if not Is_Overloaded (Expr) then
+ if Has_Good_Profile (Entity (Expr)) then
+ Subp := Entity (Expr);
+ end if;
+
+ else
+ Get_First_Interp (Expr, I, It);
+
+ while Present (It.Nam) loop
+ if Has_Good_Profile (It.Nam) then
+ Subp := It.Nam;
+ exit;
+ end if;
+
+ Get_Next_Interp (I, It);
+ end loop;
+ end if;
+ end if;
+
+ if Present (Subp) then
+ if Is_Abstract_Subprogram (Subp) then
+ Error_Msg_N ("stream subprogram must not be abstract", Expr);
+ return;
+ end if;
+
+ Set_Entity (Expr, Subp);
+ Set_Etype (Expr, Etype (Subp));
+
+ New_Stream_Subprogram (N, U_Ent, Subp, TSS_Nam);
+
+ else
+ Error_Msg_Name_1 := Attr;
+ Error_Msg_N ("incorrect expression for% attribute", Expr);
+ end if;
+ end Analyze_Stream_TSS_Definition;
+
+ -- Start of processing for Analyze_Attribute_Definition_Clause
+
begin
Analyze (Nam);
Ent := Entity (Nam);
return;
end if;
- -- Rep clause applies to full view of incomplete type or private type
- -- if we have one (if not, this is a premature use of the type).
- -- However, certain semantic checks need to be done on the specified
- -- entity (i.e. the private view), so we save it in Ent.
+ -- Rep clause applies to full view of incomplete type or private type if
+ -- we have one (if not, this is a premature use of the type). However,
+ -- certain semantic checks need to be done on the specified entity (i.e.
+ -- the private view), so we save it in Ent.
if Is_Private_Type (Ent)
and then Is_Derived_Type (Ent)
and then not Is_Tagged_Type (Ent)
and then No (Full_View (Ent))
then
- -- If this is a private type whose completion is a derivation
- -- from another private type, there is no full view, and the
- -- attribute belongs to the type itself, not its underlying parent.
+ -- If this is a private type whose completion is a derivation from
+ -- another private type, there is no full view, and the attribute
+ -- belongs to the type itself, not its underlying parent.
U_Ent := Ent;
elsif Ekind (Ent) = E_Incomplete_Type then
- -- The attribute applies to the full view, set the entity
- -- of the attribute definition accordingly.
+ -- The attribute applies to the full view, set the entity of the
+ -- attribute definition accordingly.
Ent := Underlying_Type (Ent);
U_Ent := Ent;
then
Error_Msg_N ("cannot specify attribute for subtype", Nam);
return;
-
end if;
-- Switch on particular attribute
Mark_Aliased_Address_As_Volatile (Expr);
-- Second case is where we have a constant whose
- -- definition is of the form of an adress as in:
+ -- definition is of the form of an address as in:
-- A : constant Address := K'Address;
-- ...
Nam);
end if;
- -- Entity has delayed freeze, so we will generate
- -- an alignment check at the freeze point.
+ -- Entity has delayed freeze, so we will generate an
+ -- alignment check at the freeze point unless suppressed.
- Set_Check_Address_Alignment
- (N, not Range_Checks_Suppressed (U_Ent));
+ if not Range_Checks_Suppressed (U_Ent)
+ and then not Alignment_Checks_Suppressed (U_Ent)
+ then
+ Set_Check_Address_Alignment (N);
+ end if;
-- Kill the size check code, since we are not allocating
-- the variable, it is somewhere else.
-- Input --
-----------
- when Attribute_Input => Input : declare
- Subp : Entity_Id := Empty;
- I : Interp_Index;
- It : Interp;
- Pnam : Entity_Id;
-
- function Has_Good_Profile (Subp : Entity_Id) return Boolean;
- -- Return true if the entity is a function with an appropriate
- -- profile for the Input attribute.
-
- ----------------------
- -- Has_Good_Profile --
- ----------------------
-
- function Has_Good_Profile (Subp : Entity_Id) return Boolean is
- F : Entity_Id;
- Ok : Boolean := False;
-
- begin
- if Ekind (Subp) = E_Function then
- F := First_Formal (Subp);
-
- if Present (F) and then No (Next_Formal (F)) then
- if Ekind (Etype (F)) = E_Anonymous_Access_Type
- and then
- Designated_Type (Etype (F)) =
- Class_Wide_Type (RTE (RE_Root_Stream_Type))
- then
- Ok := Base_Type (Etype (Subp)) = Base_Type (Ent);
- end if;
- end if;
- end if;
-
- return Ok;
- end Has_Good_Profile;
-
- -- Start of processing for Input attribute definition
-
- begin
- FOnly := True;
-
- if not Is_Type (U_Ent) then
- Error_Msg_N ("local name must be a subtype", Nam);
- return;
-
- else
- Pnam := TSS (Base_Type (U_Ent), TSS_Stream_Input);
-
- if Present (Pnam)
- and then Base_Type (Etype (Pnam)) = Base_Type (U_Ent)
- then
- Error_Msg_Sloc := Sloc (Pnam);
- Error_Msg_N ("input attribute already defined #", Nam);
- return;
- end if;
- end if;
-
- Analyze (Expr);
-
- if Is_Entity_Name (Expr) then
- if not Is_Overloaded (Expr) then
- if Has_Good_Profile (Entity (Expr)) then
- Subp := Entity (Expr);
- end if;
-
- else
- Get_First_Interp (Expr, I, It);
-
- while Present (It.Nam) loop
- if Has_Good_Profile (It.Nam) then
- Subp := It.Nam;
- exit;
- end if;
-
- Get_Next_Interp (I, It);
- end loop;
- end if;
- end if;
-
- if Present (Subp) then
- Set_Entity (Expr, Subp);
- Set_Etype (Expr, Etype (Subp));
- New_Stream_Function (N, U_Ent, Subp, TSS_Stream_Input);
- else
- Error_Msg_N ("incorrect expression for input attribute", Expr);
- return;
- end if;
- end Input;
+ when Attribute_Input =>
+ Analyze_Stream_TSS_Definition (TSS_Stream_Input);
+ Set_Has_Specified_Stream_Input (Ent);
-------------------
-- Machine_Radix --
-- Output --
------------
- when Attribute_Output => Output : declare
- Subp : Entity_Id := Empty;
- I : Interp_Index;
- It : Interp;
- Pnam : Entity_Id;
-
- function Has_Good_Profile (Subp : Entity_Id) return Boolean;
- -- Return true if the entity is a procedure with an
- -- appropriate profile for the output attribute.
-
- ----------------------
- -- Has_Good_Profile --
- ----------------------
-
- function Has_Good_Profile (Subp : Entity_Id) return Boolean is
- F : Entity_Id;
- Ok : Boolean := False;
-
- begin
- if Ekind (Subp) = E_Procedure then
- F := First_Formal (Subp);
-
- if Present (F) then
- if Ekind (Etype (F)) = E_Anonymous_Access_Type
- and then
- Designated_Type (Etype (F)) =
- Class_Wide_Type (RTE (RE_Root_Stream_Type))
- then
- Next_Formal (F);
- Ok := Present (F)
- and then Parameter_Mode (F) = E_In_Parameter
- and then Base_Type (Etype (F)) = Base_Type (Ent)
- and then No (Next_Formal (F));
- end if;
- end if;
- end if;
-
- return Ok;
- end Has_Good_Profile;
-
- -- Start of processing for Output attribute definition
-
- begin
- FOnly := True;
-
- if not Is_Type (U_Ent) then
- Error_Msg_N ("local name must be a subtype", Nam);
- return;
-
- else
- Pnam := TSS (Base_Type (U_Ent), TSS_Stream_Output);
-
- if Present (Pnam)
- and then
- Base_Type (Etype (Next_Formal (First_Formal (Pnam))))
- = Base_Type (U_Ent)
- then
- Error_Msg_Sloc := Sloc (Pnam);
- Error_Msg_N ("output attribute already defined #", Nam);
- return;
- end if;
- end if;
-
- Analyze (Expr);
-
- if Is_Entity_Name (Expr) then
- if not Is_Overloaded (Expr) then
- if Has_Good_Profile (Entity (Expr)) then
- Subp := Entity (Expr);
- end if;
-
- else
- Get_First_Interp (Expr, I, It);
-
- while Present (It.Nam) loop
- if Has_Good_Profile (It.Nam) then
- Subp := It.Nam;
- exit;
- end if;
-
- Get_Next_Interp (I, It);
- end loop;
- end if;
- end if;
-
- if Present (Subp) then
- Set_Entity (Expr, Subp);
- Set_Etype (Expr, Etype (Subp));
- New_Stream_Procedure (N, U_Ent, Subp, TSS_Stream_Output);
- else
- Error_Msg_N ("incorrect expression for output attribute", Expr);
- return;
- end if;
- end Output;
+ when Attribute_Output =>
+ Analyze_Stream_TSS_Definition (TSS_Stream_Output);
+ Set_Has_Specified_Stream_Output (Ent);
----------
-- Read --
----------
- when Attribute_Read => Read : declare
- Subp : Entity_Id := Empty;
- I : Interp_Index;
- It : Interp;
- Pnam : Entity_Id;
-
- function Has_Good_Profile (Subp : Entity_Id) return Boolean;
- -- Return true if the entity is a procedure with an appropriate
- -- profile for the Read attribute.
-
- ----------------------
- -- Has_Good_Profile --
- ----------------------
-
- function Has_Good_Profile (Subp : Entity_Id) return Boolean is
- F : Entity_Id;
- Ok : Boolean := False;
-
- begin
- if Ekind (Subp) = E_Procedure then
- F := First_Formal (Subp);
-
- if Present (F) then
- if Ekind (Etype (F)) = E_Anonymous_Access_Type
- and then
- Designated_Type (Etype (F)) =
- Class_Wide_Type (RTE (RE_Root_Stream_Type))
- then
- Next_Formal (F);
- Ok := Present (F)
- and then Parameter_Mode (F) = E_Out_Parameter
- and then Base_Type (Etype (F)) = Base_Type (Ent)
- and then No (Next_Formal (F));
- end if;
- end if;
- end if;
-
- return Ok;
- end Has_Good_Profile;
-
- -- Start of processing for Read attribute definition
-
- begin
- FOnly := True;
-
- if not Is_Type (U_Ent) then
- Error_Msg_N ("local name must be a subtype", Nam);
- return;
-
- else
- Pnam := TSS (Base_Type (U_Ent), TSS_Stream_Read);
-
- if Present (Pnam)
- and then Base_Type (Etype (Next_Formal (First_Formal (Pnam))))
- = Base_Type (U_Ent)
- then
- Error_Msg_Sloc := Sloc (Pnam);
- Error_Msg_N ("read attribute already defined #", Nam);
- return;
- end if;
- end if;
-
- Analyze (Expr);
-
- if Is_Entity_Name (Expr) then
- if not Is_Overloaded (Expr) then
- if Has_Good_Profile (Entity (Expr)) then
- Subp := Entity (Expr);
- end if;
-
- else
- Get_First_Interp (Expr, I, It);
-
- while Present (It.Nam) loop
- if Has_Good_Profile (It.Nam) then
- Subp := It.Nam;
- exit;
- end if;
-
- Get_Next_Interp (I, It);
- end loop;
- end if;
- end if;
-
- if Present (Subp) then
- Set_Entity (Expr, Subp);
- Set_Etype (Expr, Etype (Subp));
- New_Stream_Procedure (N, U_Ent, Subp, TSS_Stream_Read, True);
- else
- Error_Msg_N ("incorrect expression for read attribute", Expr);
- return;
- end if;
- end Read;
+ when Attribute_Read =>
+ Analyze_Stream_TSS_Definition (TSS_Stream_Read);
+ Set_Has_Specified_Stream_Read (Ent);
----------
-- Size --
Etyp := Etype (U_Ent);
end if;
- -- Check size, note that Gigi is in charge of checking
- -- that the size of an array or record type is OK. Also
- -- we do not check the size in the ordinary fixed-point
- -- case, since it is too early to do so (there may be a
- -- subsequent small clause that affects the size). We can
- -- check the size if a small clause has already been given.
+ -- Check size, note that Gigi is in charge of checking that the
+ -- size of an array or record type is OK. Also we do not check
+ -- the size in the ordinary fixed-point case, since it is too
+ -- early to do so (there may be subsequent small clause that
+ -- affects the size). We can check the size if a small clause
+ -- has already been given.
if not Is_Ordinary_Fixed_Point_Type (U_Ent)
or else Has_Small_Clause (U_Ent)
if Is_Type (U_Ent) then
Set_RM_Size (U_Ent, Size);
- -- For scalar types, increase Object_Size to power of 2,
- -- but not less than a storage unit in any case (i.e.,
- -- normally this means it will be byte addressable).
+ -- For scalar types, increase Object_Size to power of 2, but
+ -- not less than a storage unit in any case (i.e., normally
+ -- this means it will be byte addressable).
if Is_Scalar_Type (U_Ent) then
if Size <= System_Storage_Unit then
Size /= System_Storage_Unit * 8
then
Error_Msg_Uint_1 := UI_From_Int (System_Storage_Unit);
+ Error_Msg_Uint_2 := Error_Msg_Uint_1 * 8;
Error_Msg_N
("size for primitive object must be a power of 2"
- & " and at least ^", N);
+ & " in the range ^-^", N);
end if;
end if;
if not Is_Ordinary_Fixed_Point_Type (U_Ent) then
Error_Msg_N
- ("small requires an ordinary fixed point type", Nam);
-
- elsif Has_Small_Clause (U_Ent) then
- Error_Msg_N ("small already given for &", Nam);
-
- elsif Small > Delta_Value (U_Ent) then
- Error_Msg_N
- ("small value must not be greater then delta value", Nam);
-
- else
- Set_Small_Value (U_Ent, Small);
- Set_Small_Value (Implicit_Base, Small);
- Set_Has_Small_Clause (U_Ent);
- Set_Has_Small_Clause (Implicit_Base);
- Set_Has_Non_Standard_Rep (Implicit_Base);
- end if;
- end Small;
-
- ------------------
- -- Storage_Size --
- ------------------
-
- -- Storage_Size attribute definition clause
-
- when Attribute_Storage_Size => Storage_Size : declare
- Btype : constant Entity_Id := Base_Type (U_Ent);
- Sprag : Node_Id;
-
- begin
- if Is_Task_Type (U_Ent) then
- Check_Restriction (No_Obsolescent_Features, N);
-
- if Warn_On_Obsolescent_Feature then
- Error_Msg_N
- ("storage size clause for task is an " &
- "obsolescent feature ('R'M 'J.9)?", N);
- Error_Msg_N
- ("\use Storage_Size pragma instead?", N);
- end if;
-
- FOnly := True;
- end if;
-
- if not Is_Access_Type (U_Ent)
- and then Ekind (U_Ent) /= E_Task_Type
- then
- Error_Msg_N ("storage size cannot be given for &", Nam);
-
- elsif Is_Access_Type (U_Ent) and Is_Derived_Type (U_Ent) then
- Error_Msg_N
- ("storage size cannot be given for a derived access type",
- Nam);
-
- elsif Has_Storage_Size_Clause (Btype) then
- Error_Msg_N ("storage size already given for &", Nam);
-
- else
- Analyze_And_Resolve (Expr, Any_Integer);
-
- if Is_Access_Type (U_Ent) then
-
- if Present (Associated_Storage_Pool (U_Ent)) then
- Error_Msg_N ("storage pool already given for &", Nam);
- return;
- end if;
-
- if Compile_Time_Known_Value (Expr)
- and then Expr_Value (Expr) = 0
- then
- Set_No_Pool_Assigned (Btype);
- end if;
+ ("small requires an ordinary fixed point type", Nam);
- else -- Is_Task_Type (U_Ent)
- Sprag := Get_Rep_Pragma (Btype, Name_Storage_Size);
+ elsif Has_Small_Clause (U_Ent) then
+ Error_Msg_N ("small already given for &", Nam);
- if Present (Sprag) then
- Error_Msg_Sloc := Sloc (Sprag);
- Error_Msg_N
- ("Storage_Size already specified#", Nam);
- return;
- end if;
- end if;
+ elsif Small > Delta_Value (U_Ent) then
+ Error_Msg_N
+ ("small value must not be greater then delta value", Nam);
- Set_Has_Storage_Size_Clause (Btype);
+ else
+ Set_Small_Value (U_Ent, Small);
+ Set_Small_Value (Implicit_Base, Small);
+ Set_Has_Small_Clause (U_Ent);
+ Set_Has_Small_Clause (Implicit_Base);
+ Set_Has_Non_Standard_Rep (Implicit_Base);
end if;
- end Storage_Size;
+ end Small;
------------------
-- Storage_Pool --
T : Entity_Id;
begin
- if Ekind (U_Ent) /= E_Access_Type
+ if Ekind (U_Ent) = E_Access_Subprogram_Type then
+ Error_Msg_N
+ ("storage pool cannot be given for access-to-subprogram type",
+ Nam);
+ return;
+
+ elsif Ekind (U_Ent) /= E_Access_Type
and then Ekind (U_Ent) /= E_General_Access_Type
then
- Error_Msg_N (
- "storage pool can only be given for access types", Nam);
+ Error_Msg_N
+ ("storage pool can only be given for access types", Nam);
return;
elsif Is_Derived_Type (U_Ent) then
end if;
end Storage_Pool;
+ ------------------
+ -- Storage_Size --
+ ------------------
+
+ -- Storage_Size attribute definition clause
+
+ when Attribute_Storage_Size => Storage_Size : declare
+ Btype : constant Entity_Id := Base_Type (U_Ent);
+ Sprag : Node_Id;
+
+ begin
+ if Is_Task_Type (U_Ent) then
+ Check_Restriction (No_Obsolescent_Features, N);
+
+ if Warn_On_Obsolescent_Feature then
+ Error_Msg_N
+ ("storage size clause for task is an " &
+ "obsolescent feature ('R'M 'J.9)?", N);
+ Error_Msg_N
+ ("\use Storage_Size pragma instead?", N);
+ end if;
+
+ FOnly := True;
+ end if;
+
+ if not Is_Access_Type (U_Ent)
+ and then Ekind (U_Ent) /= E_Task_Type
+ then
+ Error_Msg_N ("storage size cannot be given for &", Nam);
+
+ elsif Is_Access_Type (U_Ent) and Is_Derived_Type (U_Ent) then
+ Error_Msg_N
+ ("storage size cannot be given for a derived access type",
+ Nam);
+
+ elsif Has_Storage_Size_Clause (Btype) then
+ Error_Msg_N ("storage size already given for &", Nam);
+
+ else
+ Analyze_And_Resolve (Expr, Any_Integer);
+
+ if Is_Access_Type (U_Ent) then
+ if Present (Associated_Storage_Pool (U_Ent)) then
+ Error_Msg_N ("storage pool already given for &", Nam);
+ return;
+ end if;
+
+ if Compile_Time_Known_Value (Expr)
+ and then Expr_Value (Expr) = 0
+ then
+ Set_No_Pool_Assigned (Btype);
+ end if;
+
+ else -- Is_Task_Type (U_Ent)
+ Sprag := Get_Rep_Pragma (Btype, Name_Storage_Size);
+
+ if Present (Sprag) then
+ Error_Msg_Sloc := Sloc (Sprag);
+ Error_Msg_N
+ ("Storage_Size already specified#", Nam);
+ return;
+ end if;
+ end if;
+
+ Set_Has_Storage_Size_Clause (Btype);
+ end if;
+ end Storage_Size;
+
+ -----------------
+ -- Stream_Size --
+ -----------------
+
+ when Attribute_Stream_Size => Stream_Size : declare
+ Size : constant Uint := Static_Integer (Expr);
+
+ begin
+ if Has_Stream_Size_Clause (U_Ent) then
+ Error_Msg_N ("Stream_Size already given for &", Nam);
+
+ elsif Is_Elementary_Type (U_Ent) then
+ if Size /= System_Storage_Unit
+ and then
+ Size /= System_Storage_Unit * 2
+ and then
+ Size /= System_Storage_Unit * 4
+ and then
+ Size /= System_Storage_Unit * 8
+ then
+ Error_Msg_Uint_1 := UI_From_Int (System_Storage_Unit);
+ Error_Msg_N
+ ("stream size for elementary type must be a"
+ & " power of 2 and at least ^", N);
+
+ elsif RM_Size (U_Ent) > Size then
+ Error_Msg_Uint_1 := RM_Size (U_Ent);
+ Error_Msg_N
+ ("stream size for elementary type must be a"
+ & " power of 2 and at least ^", N);
+ end if;
+
+ Set_Has_Stream_Size_Clause (U_Ent);
+
+ else
+ Error_Msg_N ("Stream_Size cannot be given for &", Nam);
+ end if;
+ end Stream_Size;
+
----------------
-- Value_Size --
----------------
then
Error_Msg_N ("Value_Size already given for &", Nam);
+ elsif Is_Array_Type (U_Ent)
+ and then not Is_Constrained (U_Ent)
+ then
+ Error_Msg_N
+ ("Value_Size cannot be given for unconstrained array", Nam);
+
else
if Is_Elementary_Type (U_Ent) then
Check_Size (Expr, U_Ent, Size, Biased);
-- Write --
-----------
- -- Write attribute definition clause
- -- check for class-wide case will be performed later
-
- when Attribute_Write => Write : declare
- Subp : Entity_Id := Empty;
- I : Interp_Index;
- It : Interp;
- Pnam : Entity_Id;
-
- function Has_Good_Profile (Subp : Entity_Id) return Boolean;
- -- Return true if the entity is a procedure with an
- -- appropriate profile for the write attribute.
-
- ----------------------
- -- Has_Good_Profile --
- ----------------------
-
- function Has_Good_Profile (Subp : Entity_Id) return Boolean is
- F : Entity_Id;
- Ok : Boolean := False;
-
- begin
- if Ekind (Subp) = E_Procedure then
- F := First_Formal (Subp);
-
- if Present (F) then
- if Ekind (Etype (F)) = E_Anonymous_Access_Type
- and then
- Designated_Type (Etype (F)) =
- Class_Wide_Type (RTE (RE_Root_Stream_Type))
- then
- Next_Formal (F);
- Ok := Present (F)
- and then Parameter_Mode (F) = E_In_Parameter
- and then Base_Type (Etype (F)) = Base_Type (Ent)
- and then No (Next_Formal (F));
- end if;
- end if;
- end if;
-
- return Ok;
- end Has_Good_Profile;
-
- -- Start of processing for Write attribute definition
-
- begin
- FOnly := True;
-
- if not Is_Type (U_Ent) then
- Error_Msg_N ("local name must be a subtype", Nam);
- return;
- end if;
-
- Pnam := TSS (Base_Type (U_Ent), TSS_Stream_Write);
-
- if Present (Pnam)
- and then Base_Type (Etype (Next_Formal (First_Formal (Pnam))))
- = Base_Type (U_Ent)
- then
- Error_Msg_Sloc := Sloc (Pnam);
- Error_Msg_N ("write attribute already defined #", Nam);
- return;
- end if;
-
- Analyze (Expr);
-
- if Is_Entity_Name (Expr) then
- if not Is_Overloaded (Expr) then
- if Has_Good_Profile (Entity (Expr)) then
- Subp := Entity (Expr);
- end if;
-
- else
- Get_First_Interp (Expr, I, It);
-
- while Present (It.Nam) loop
- if Has_Good_Profile (It.Nam) then
- Subp := It.Nam;
- exit;
- end if;
-
- Get_Next_Interp (I, It);
- end loop;
- end if;
- end if;
-
- if Present (Subp) then
- Set_Entity (Expr, Subp);
- Set_Etype (Expr, Etype (Subp));
- New_Stream_Procedure (N, U_Ent, Subp, TSS_Stream_Write);
- else
- Error_Msg_N ("incorrect expression for write attribute", Expr);
- return;
- end if;
- end Write;
+ when Attribute_Write =>
+ Analyze_Stream_TSS_Definition (TSS_Stream_Write);
+ Set_Has_Specified_Stream_Write (Ent);
-- All other attributes cannot be set
when others =>
Error_Msg_N
("attribute& cannot be set with definition clause", N);
-
end case;
-- The test for the type being frozen must be performed after
return;
end if;
+ Check_Code_Statement (N);
+
-- Make sure we appear in the handled statement sequence of a
-- subprogram (RM 13.8(3)).
Error_Msg_N ("duplicate enumeration rep clause ignored", N);
return;
- -- Don't allow rep clause if root type is standard [wide_]character
+ -- Don't allow rep clause for standard [wide_[wide_]]character
elsif Root_Type (Enumtype) = Standard_Character
or else Root_Type (Enumtype) = Standard_Wide_Character
+ or else Root_Type (Enumtype) = Standard_Wide_Wide_Character
then
Error_Msg_N ("enumeration rep clause not allowed for this type", N);
return;
+ -- Check that the expression is a proper aggregate (no parentheses)
+
+ elsif Paren_Count (Aggr) /= 0 then
+ Error_Msg
+ ("extra parentheses surrounding aggregate not allowed",
+ First_Sloc (Aggr));
+ return;
+
-- All tests passed, so set rep clause in place
else
-- normal expansion activities, and a number of special semantic
-- rules apply (including the component type being any integer type)
- -- Badent signals that we found some incorrect entries processing
- -- the list. The final checks for completeness and ordering are
- -- skipped in this case.
-
Elit := First_Literal (Enumtype);
-- First the positional entries if any
Val := Static_Integer (Expr);
+ -- Err signals that we found some incorrect entries processing
+ -- the list. The final checks for completeness and ordering are
+ -- skipped in this case.
+
if Val = No_Uint then
Err := True;
-
elsif Val < Lo or else Hi < Val then
Error_Msg_N ("value outside permitted range", Expr);
Err := True;
Ccount : Natural := 0;
-- Number of component clauses in record rep clause
+ CR_Pragma : Node_Id := Empty;
+ -- Points to N_Pragma node if Complete_Representation pragma present
+
begin
Find_Type (Ident);
Rectype := Entity (Ident);
-- Clear any existing component clauses for the type (this happens
-- with derived types, where we are now overriding the original)
- Fent := First_Entity (Rectype);
-
- Comp := Fent;
+ Comp := First_Component_Or_Discriminant (Rectype);
while Present (Comp) loop
- if Ekind (Comp) = E_Component
- or else Ekind (Comp) = E_Discriminant
- then
- Set_Component_Clause (Comp, Empty);
- end if;
-
- Next_Entity (Comp);
+ Set_Component_Clause (Comp, Empty);
+ Next_Component_Or_Discriminant (Comp);
end loop;
-- All done if no component clauses
-- it at the start of the record (otherwise gigi may place it after
-- other fields that have rep clauses).
+ Fent := First_Entity (Rectype);
+
if Nkind (Fent) = N_Defining_Identifier
and then Chars (Fent) = Name_uTag
then
while Present (CC) loop
- -- If pragma, just analyze it
+ -- Pragma
if Nkind (CC) = N_Pragma then
Analyze (CC);
+ -- The only pragma of interest is Complete_Representation
+
+ if Chars (CC) = Name_Complete_Representation then
+ CR_Pragma := CC;
+ end if;
+
-- Processing for real component clause
else
then
-- Nothing to do if at least one component with no component clause
- Comp := First_Entity (Rectype);
+ Comp := First_Component_Or_Discriminant (Rectype);
while Present (Comp) loop
- if Ekind (Comp) = E_Component
- or else Ekind (Comp) = E_Discriminant
- then
- if No (Component_Clause (Comp)) then
- return;
- end if;
- end if;
-
- Next_Entity (Comp);
+ exit when No (Component_Clause (Comp));
+ Next_Component_Or_Discriminant (Comp);
end loop;
-- If we fall out of loop, all components have component clauses
-- and so we can set the size to the maximum value.
- Set_RM_Size (Rectype, Hbit + 1);
+ if No (Comp) then
+ Set_RM_Size (Rectype, Hbit + 1);
+ end if;
+ end if;
+
+ -- Check missing components if Complete_Representation pragma appeared
+
+ if Present (CR_Pragma) then
+ Comp := First_Component_Or_Discriminant (Rectype);
+ while Present (Comp) loop
+ if No (Component_Clause (Comp)) then
+ Error_Msg_NE
+ ("missing component clause for &", CR_Pragma, Comp);
+ end if;
+
+ Next_Component_Or_Discriminant (Comp);
+ end loop;
end if;
end Analyze_Record_Representation_Clause;
Check_Expr_Constants (Prefix (Nod));
when N_Attribute_Reference =>
-
if Attribute_Name (Nod) = Name_Address
or else
Attribute_Name (Nod) = Name_Access
when N_Null =>
return;
- when N_Binary_Op | N_And_Then | N_Or_Else | N_In | N_Not_In =>
+ when N_Binary_Op | N_And_Then | N_Or_Else | N_Membership_Test =>
Check_Expr_Constants (Left_Opnd (Nod));
Check_Expr_Constants (Right_Opnd (Nod));
return S;
end Minimum_Size;
- -------------------------
- -- New_Stream_Function --
- -------------------------
+ ---------------------------
+ -- New_Stream_Subprogram --
+ ---------------------------
- procedure New_Stream_Function
- (N : Node_Id;
- Ent : Entity_Id;
- Subp : Entity_Id;
- Nam : TSS_Name_Type)
+ procedure New_Stream_Subprogram
+ (N : Node_Id;
+ Ent : Entity_Id;
+ Subp : Entity_Id;
+ Nam : TSS_Name_Type)
is
Loc : constant Source_Ptr := Sloc (N);
Sname : constant Name_Id := Make_TSS_Name (Base_Type (Ent), Nam);
F : Entity_Id;
Etyp : Entity_Id;
+ Defer_Declaration : constant Boolean :=
+ Is_Tagged_Type (Ent) or else Is_Private_Type (Ent);
+ -- For a tagged type, there is a declaration for each stream attribute
+ -- at the freeze point, and we must generate only a completion of this
+ -- declaration. We do the same for private types, because the full view
+ -- might be tagged. Otherwise we generate a declaration at the point of
+ -- the attribute definition clause.
+
function Build_Spec return Node_Id;
-- Used for declaration and renaming declaration, so that this is
-- treated as a renaming_as_body.
----------------
function Build_Spec return Node_Id is
+ Out_P : constant Boolean := (Nam = TSS_Stream_Read);
+ Formals : List_Id;
+ Spec : Node_Id;
+ T_Ref : constant Node_Id := New_Reference_To (Etyp, Loc);
+
begin
Subp_Id := Make_Defining_Identifier (Loc, Sname);
- return
- Make_Function_Specification (Loc,
- Defining_Unit_Name => Subp_Id,
- Parameter_Specifications =>
- New_List (
- Make_Parameter_Specification (Loc,
- Defining_Identifier =>
- Make_Defining_Identifier (Loc, Name_S),
- Parameter_Type =>
- Make_Access_Definition (Loc,
- Subtype_Mark =>
- New_Reference_To (
- Designated_Type (Etype (F)), Loc)))),
-
- Subtype_Mark =>
- New_Reference_To (Etyp, Loc));
- end Build_Spec;
+ -- S : access Root_Stream_Type'Class
+
+ Formals := New_List (
+ Make_Parameter_Specification (Loc,
+ Defining_Identifier =>
+ Make_Defining_Identifier (Loc, Name_S),
+ Parameter_Type =>
+ Make_Access_Definition (Loc,
+ Subtype_Mark =>
+ New_Reference_To (
+ Designated_Type (Etype (F)), Loc))));
+
+ if Nam = TSS_Stream_Input then
+ Spec := Make_Function_Specification (Loc,
+ Defining_Unit_Name => Subp_Id,
+ Parameter_Specifications => Formals,
+ Result_Definition => T_Ref);
+ else
+ -- V : [out] T
- -- Start of processing for New_Stream_Function
+ Append_To (Formals,
+ Make_Parameter_Specification (Loc,
+ Defining_Identifier => Make_Defining_Identifier (Loc, Name_V),
+ Out_Present => Out_P,
+ Parameter_Type => T_Ref));
- begin
- F := First_Formal (Subp);
- Etyp := Etype (Subp);
+ Spec := Make_Procedure_Specification (Loc,
+ Defining_Unit_Name => Subp_Id,
+ Parameter_Specifications => Formals);
+ end if;
- if not Is_Tagged_Type (Ent) then
- Subp_Decl :=
- Make_Subprogram_Declaration (Loc,
- Specification => Build_Spec);
- Insert_Action (N, Subp_Decl);
- end if;
+ return Spec;
+ end Build_Spec;
- Subp_Decl :=
- Make_Subprogram_Renaming_Declaration (Loc,
- Specification => Build_Spec,
- Name => New_Reference_To (Subp, Loc));
+ -- Start of processing for New_Stream_Subprogram
- if Is_Tagged_Type (Ent) and then not Is_Limited_Type (Ent) then
- Set_TSS (Base_Type (Ent), Subp_Id);
+ begin
+ F := First_Formal (Subp);
+
+ if Ekind (Subp) = E_Procedure then
+ Etyp := Etype (Next_Formal (F));
else
- Insert_Action (N, Subp_Decl);
- Copy_TSS (Subp_Id, Base_Type (Ent));
+ Etyp := Etype (Subp);
end if;
- end New_Stream_Function;
-
- --------------------------
- -- New_Stream_Procedure --
- --------------------------
-
- procedure New_Stream_Procedure
- (N : Node_Id;
- Ent : Entity_Id;
- Subp : Entity_Id;
- Nam : TSS_Name_Type;
- Out_P : Boolean := False)
- is
- Loc : constant Source_Ptr := Sloc (N);
- Sname : constant Name_Id := Make_TSS_Name (Base_Type (Ent), Nam);
- Subp_Id : Entity_Id;
- Subp_Decl : Node_Id;
- F : Entity_Id;
- Etyp : Entity_Id;
-
- function Build_Spec return Node_Id;
- -- Used for declaration and renaming declaration, so that this is
- -- treated as a renaming_as_body.
-
- ----------------
- -- Build_Spec --
- ----------------
-
- function Build_Spec return Node_Id is
- begin
- Subp_Id := Make_Defining_Identifier (Loc, Sname);
-
- return
- Make_Procedure_Specification (Loc,
- Defining_Unit_Name => Subp_Id,
- Parameter_Specifications =>
- New_List (
- Make_Parameter_Specification (Loc,
- Defining_Identifier =>
- Make_Defining_Identifier (Loc, Name_S),
- Parameter_Type =>
- Make_Access_Definition (Loc,
- Subtype_Mark =>
- New_Reference_To (
- Designated_Type (Etype (F)), Loc))),
-
- Make_Parameter_Specification (Loc,
- Defining_Identifier =>
- Make_Defining_Identifier (Loc, Name_V),
- Out_Present => Out_P,
- Parameter_Type =>
- New_Reference_To (Etyp, Loc))));
- end Build_Spec;
- -- Start of processing for New_Stream_Procedure
+ -- Prepare subprogram declaration and insert it as an action on the
+ -- clause node. The visibility for this entity is used to test for
+ -- visibility of the attribute definition clause (in the sense of
+ -- 8.3(23) as amended by AI-195).
- begin
- F := First_Formal (Subp);
- Etyp := Etype (Next_Formal (F));
-
- if not Is_Tagged_Type (Ent) then
+ if not Defer_Declaration then
Subp_Decl :=
Make_Subprogram_Declaration (Loc,
Specification => Build_Spec);
- Insert_Action (N, Subp_Decl);
+
+ -- For a tagged type, there is always a visible declaration for each
+ -- stream TSS (it is a predefined primitive operation), and the for the
+ -- completion of this declaration occurs at the freeze point, which is
+ -- not always visible at places where the attribute definition clause is
+ -- visible. So, we create a dummy entity here for the purpose of
+ -- tracking the visibility of the attribute definition clause itself.
+
+ else
+ Subp_Id :=
+ Make_Defining_Identifier (Loc,
+ Chars => New_External_Name (Sname, 'V'));
+ Subp_Decl :=
+ Make_Object_Declaration (Loc,
+ Defining_Identifier => Subp_Id,
+ Object_Definition => New_Occurrence_Of (Standard_Boolean, Loc));
end if;
+ Insert_Action (N, Subp_Decl);
+ Set_Entity (N, Subp_Id);
+
Subp_Decl :=
Make_Subprogram_Renaming_Declaration (Loc,
Specification => Build_Spec,
Name => New_Reference_To (Subp, Loc));
- if Is_Tagged_Type (Ent) and then not Is_Limited_Type (Ent) then
+ if Defer_Declaration then
Set_TSS (Base_Type (Ent), Subp_Id);
else
Insert_Action (N, Subp_Decl);
Copy_TSS (Subp_Id, Base_Type (Ent));
end if;
- end New_Stream_Procedure;
+ end New_Stream_Subprogram;
------------------------
-- Rep_Item_Too_Early --
function Rep_Item_Too_Early (T : Entity_Id; N : Node_Id) return Boolean is
begin
- -- Cannot apply rep items that are not operational items
- -- to generic types
+ -- Cannot apply non-operational rep items to generic types
if Is_Operational_Item (N) then
return False;
if Present (Freeze_Node (S)) then
Error_Msg_NE
- ("?no more representation items for }!", Freeze_Node (S), S);
+ ("?no more representation items for }", Freeze_Node (S), S);
end if;
return True;
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