-- --
-- B o d y --
-- --
--- Copyright (C) 1992-2009, Free Software Foundation, Inc. --
+-- Copyright (C) 1992-2010, 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- --
with Atree; use Atree;
with Checks; use Checks;
with Einfo; use Einfo;
+with Elists; use Elists;
with Errout; use Errout;
+with Exp_Disp; use Exp_Disp;
with Exp_Tss; use Exp_Tss;
with Exp_Util; use Exp_Util;
with Lib; use Lib;
with Snames; use Snames;
with Stand; use Stand;
with Sinfo; use Sinfo;
-with Table;
with Targparm; use Targparm;
with Ttypes; use Ttypes;
with Tbuild; use Tbuild;
-- renaming_as_body. For tagged types, the specification is one of the
-- primitive specs.
+ procedure Set_Biased
+ (E : Entity_Id;
+ N : Node_Id;
+ Msg : String;
+ Biased : Boolean := True);
+ -- If Biased is True, sets Has_Biased_Representation flag for E, and
+ -- outputs a warning message at node N if Warn_On_Biased_Representation is
+ -- is True. This warning inserts the string Msg to describe the construct
+ -- causing biasing.
+
----------------------------------------------
-- Table for Validate_Unchecked_Conversions --
----------------------------------------------
begin
-- Processing depends on version of Ada
- case Ada_Version is
+ -- For Ada 95, we just renumber bits within a storage unit. We do the
+ -- same for Ada 83 mode, since we recognize pragma Bit_Order in Ada 83,
+ -- and are free to add this extension.
- -- For Ada 95, we just renumber bits within a storage unit. We do
- -- the same for Ada 83 mode, since we recognize pragma Bit_Order
- -- in Ada 83, and are free to add this extension.
+ if Ada_Version < Ada_2005 then
+ Comp := First_Component_Or_Discriminant (R);
+ while Present (Comp) loop
+ CC := Component_Clause (Comp);
- when Ada_83 | Ada_95 =>
- Comp := First_Component_Or_Discriminant (R);
- while Present (Comp) loop
- CC := Component_Clause (Comp);
+ -- If component clause is present, then deal with the non-default
+ -- bit order case for Ada 95 mode.
- -- If component clause is present, then deal with the non-
- -- default bit order case for Ada 95 mode.
+ -- We only do this processing for the base type, and in fact that
+ -- is important, since otherwise if there are record subtypes, we
+ -- could reverse the bits once for each subtype, which is wrong.
- -- We only do this processing for the base type, and in
- -- fact that's important, since otherwise if there are
- -- record subtypes, we could reverse the bits once for
- -- each subtype, which would be incorrect.
+ if Present (CC)
+ and then Ekind (R) = E_Record_Type
+ then
+ declare
+ CFB : constant Uint := Component_Bit_Offset (Comp);
+ CSZ : constant Uint := Esize (Comp);
+ CLC : constant Node_Id := Component_Clause (Comp);
+ Pos : constant Node_Id := Position (CLC);
+ FB : constant Node_Id := First_Bit (CLC);
- if Present (CC)
- and then Ekind (R) = E_Record_Type
- then
- declare
- CFB : constant Uint := Component_Bit_Offset (Comp);
- CSZ : constant Uint := Esize (Comp);
- CLC : constant Node_Id := Component_Clause (Comp);
- Pos : constant Node_Id := Position (CLC);
- FB : constant Node_Id := First_Bit (CLC);
+ Storage_Unit_Offset : constant Uint :=
+ CFB / System_Storage_Unit;
- Storage_Unit_Offset : constant Uint :=
- CFB / System_Storage_Unit;
+ Start_Bit : constant Uint :=
+ CFB mod System_Storage_Unit;
- Start_Bit : constant Uint :=
- CFB mod System_Storage_Unit;
+ begin
+ -- Cases where field goes over storage unit boundary
- begin
- -- Cases where field goes over storage unit boundary
+ if Start_Bit + CSZ > System_Storage_Unit then
- if Start_Bit + CSZ > System_Storage_Unit then
+ -- Allow multi-byte field but generate warning
- -- Allow multi-byte field but generate warning
+ if Start_Bit mod System_Storage_Unit = 0
+ and then CSZ mod System_Storage_Unit = 0
+ then
+ Error_Msg_N
+ ("multi-byte field specified with non-standard"
+ & " Bit_Order?", CLC);
- if Start_Bit mod System_Storage_Unit = 0
- and then CSZ mod System_Storage_Unit = 0
- then
+ if Bytes_Big_Endian then
Error_Msg_N
- ("multi-byte field specified with non-standard"
- & " Bit_Order?", CLC);
-
- if Bytes_Big_Endian then
- Error_Msg_N
- ("bytes are not reversed "
- & "(component is big-endian)?", CLC);
- else
- Error_Msg_N
- ("bytes are not reversed "
- & "(component is little-endian)?", CLC);
- end if;
-
- -- Do not allow non-contiguous field
-
+ ("bytes are not reversed "
+ & "(component is big-endian)?", CLC);
else
Error_Msg_N
- ("attempt to specify non-contiguous field "
- & "not permitted", CLC);
- Error_Msg_N
- ("\caused by non-standard Bit_Order "
- & "specified", CLC);
- Error_Msg_N
- ("\consider possibility of using "
- & "Ada 2005 mode here", CLC);
+ ("bytes are not reversed "
+ & "(component is little-endian)?", CLC);
end if;
- -- Case where field fits in one storage unit
+ -- Do not allow non-contiguous field
else
- -- Give warning if suspicious component clause
+ Error_Msg_N
+ ("attempt to specify non-contiguous field "
+ & "not permitted", CLC);
+ Error_Msg_N
+ ("\caused by non-standard Bit_Order "
+ & "specified", CLC);
+ Error_Msg_N
+ ("\consider possibility of using "
+ & "Ada 2005 mode here", CLC);
+ end if;
- if Intval (FB) >= System_Storage_Unit
- and then Warn_On_Reverse_Bit_Order
- then
- Error_Msg_N
- ("?Bit_Order clause does not affect " &
- "byte ordering", Pos);
- Error_Msg_Uint_1 :=
- Intval (Pos) + Intval (FB) /
- System_Storage_Unit;
- Error_Msg_N
- ("?position normalized to ^ before bit " &
- "order interpreted", Pos);
- end if;
+ -- Case where field fits in one storage unit
- -- Here is where we fix up the Component_Bit_Offset
- -- value to account for the reverse bit order.
- -- Some examples of what needs to be done are:
+ else
+ -- Give warning if suspicious component clause
- -- First_Bit .. Last_Bit Component_Bit_Offset
- -- old new old new
+ if Intval (FB) >= System_Storage_Unit
+ and then Warn_On_Reverse_Bit_Order
+ then
+ Error_Msg_N
+ ("?Bit_Order clause does not affect " &
+ "byte ordering", Pos);
+ Error_Msg_Uint_1 :=
+ Intval (Pos) + Intval (FB) /
+ System_Storage_Unit;
+ Error_Msg_N
+ ("?position normalized to ^ before bit " &
+ "order interpreted", Pos);
+ end if;
- -- 0 .. 0 7 .. 7 0 7
- -- 0 .. 1 6 .. 7 0 6
- -- 0 .. 2 5 .. 7 0 5
- -- 0 .. 7 0 .. 7 0 4
+ -- Here is where we fix up the Component_Bit_Offset value
+ -- to account for the reverse bit order. Some examples of
+ -- what needs to be done are:
+
+ -- First_Bit .. Last_Bit Component_Bit_Offset
+ -- old new old new
- -- 1 .. 1 6 .. 6 1 6
- -- 1 .. 4 3 .. 6 1 3
- -- 4 .. 7 0 .. 3 4 0
+ -- 0 .. 0 7 .. 7 0 7
+ -- 0 .. 1 6 .. 7 0 6
+ -- 0 .. 2 5 .. 7 0 5
+ -- 0 .. 7 0 .. 7 0 4
- -- The general rule is that the first bit is
- -- is obtained by subtracting the old ending bit
- -- from storage_unit - 1.
+ -- 1 .. 1 6 .. 6 1 6
+ -- 1 .. 4 3 .. 6 1 3
+ -- 4 .. 7 0 .. 3 4 0
- Set_Component_Bit_Offset
- (Comp,
- (Storage_Unit_Offset * System_Storage_Unit) +
- (System_Storage_Unit - 1) -
- (Start_Bit + CSZ - 1));
+ -- The rule is that the first bit is is obtained by
+ -- subtracting the old ending bit from storage_unit - 1.
- Set_Normalized_First_Bit
- (Comp,
- Component_Bit_Offset (Comp) mod
- System_Storage_Unit);
- end if;
- end;
- end if;
+ Set_Component_Bit_Offset
+ (Comp,
+ (Storage_Unit_Offset * System_Storage_Unit) +
+ (System_Storage_Unit - 1) -
+ (Start_Bit + CSZ - 1));
- Next_Component_Or_Discriminant (Comp);
- end loop;
+ Set_Normalized_First_Bit
+ (Comp,
+ Component_Bit_Offset (Comp) mod
+ System_Storage_Unit);
+ end if;
+ end;
+ end if;
- -- For Ada 2005, we do machine scalar processing, as fully described
- -- In AI-133. This involves gathering all components which start at
- -- the same byte offset and processing them together
+ Next_Component_Or_Discriminant (Comp);
+ end loop;
- when Ada_05 =>
- declare
- Max_Machine_Scalar_Size : constant Uint :=
- UI_From_Int
- (Standard_Long_Long_Integer_Size);
+ -- For Ada 2005, we do machine scalar processing, as fully described In
+ -- AI-133. This involves gathering all components which start at the
+ -- same byte offset and processing them together. Same approach is still
+ -- valid in later versions including Ada 2012.
+
+ else
+ declare
+ Max_Machine_Scalar_Size : constant Uint :=
+ UI_From_Int
+ (Standard_Long_Long_Integer_Size);
-- We use this as the maximum machine scalar size
- Num_CC : Natural;
- SSU : constant Uint := UI_From_Int (System_Storage_Unit);
+ Num_CC : Natural;
+ 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.
+ 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
+ CC := Component_Clause (Comp);
- Num_CC := 0;
- Comp := First_Component_Or_Discriminant (R);
- while Present (Comp) loop
- CC := Component_Clause (Comp);
+ if Present (CC) then
+ declare
+ Fbit : constant Uint :=
+ Static_Integer (First_Bit (CC));
- if Present (CC) then
- declare
- Fbit : constant Uint :=
- Static_Integer (First_Bit (CC));
+ begin
+ -- Case of component with size > max machine scalar
- begin
- -- Case of component with size > max machine scalar
+ if Esize (Comp) > Max_Machine_Scalar_Size then
- if Esize (Comp) > Max_Machine_Scalar_Size then
+ -- Must begin on byte boundary
- -- 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;
- 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));
- Error_Msg_N
- ("\must be a multiple of ^ "
- & "if size greater than ^",
- First_Bit (CC));
+ -- Must end on byte boundary
- -- 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;
- 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));
- Error_Msg_N
- ("\must be a multiple of ^ if size "
- & "greater than ^",
- Last_Bit (CC));
+ -- OK, give warning if enabled
- -- 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);
- elsif Warn_On_Reverse_Bit_Order then
+ if Bytes_Big_Endian 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;
+ ("\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.
+ -- 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;
- end if;
+ else
+ Num_CC := Num_CC + 1;
+ end if;
+ end;
+ end if;
- Next_Component_Or_Discriminant (Comp);
- end loop;
+ 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.
+ -- We need to sort the component clauses on the basis of the
+ -- Position values in the clause, so we can group clauses with
+ -- the same Position. together to determine the relevant machine
+ -- scalar size.
- Sort_CC : declare
- Comps : array (0 .. Num_CC) of Entity_Id;
- -- Array to collect component and discriminant entities. The
- -- data starts at index 1, the 0'th entry is for the sort
- -- routine.
+ Sort_CC : declare
+ Comps : array (0 .. Num_CC) of Entity_Id;
+ -- Array to collect component and discriminant entities. The
+ -- data starts at index 1, the 0'th entry is for the sort
+ -- routine.
- function CP_Lt (Op1, Op2 : Natural) return Boolean;
- -- Compare routine for Sort
+ function CP_Lt (Op1, Op2 : Natural) return Boolean;
+ -- Compare routine for Sort
- procedure CP_Move (From : Natural; To : Natural);
- -- Move routine for Sort
+ procedure CP_Move (From : Natural; To : Natural);
+ -- Move routine for Sort
- package Sorting is new GNAT.Heap_Sort_G (CP_Move, CP_Lt);
+ package Sorting is new GNAT.Heap_Sort_G (CP_Move, CP_Lt);
- 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).
+ Start : Natural;
+ Stop : Natural;
+ -- Start and stop positions in the component list of the set of
+ -- components with the same starting position (that constitute
+ -- components in a single machine scalar).
- MaxL : Uint;
- -- Maximum last bit value of any component in this set
+ MaxL : Uint;
+ -- Maximum last bit value of any component in this set
- MSS : Uint;
- -- Corresponding machine scalar size
+ MSS : Uint;
+ -- Corresponding machine scalar size
- -----------
- -- CP_Lt --
- -----------
+ -----------
+ -- 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;
+ 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 --
- -------------
+ -------------
+ -- CP_Move --
+ -------------
- procedure CP_Move (From : Natural; To : Natural) is
- begin
- Comps (To) := Comps (From);
- end CP_Move;
+ procedure CP_Move (From : Natural; To : Natural) is
+ begin
+ Comps (To) := Comps (From);
+ end CP_Move;
-- Start of processing for Sort_CC
- begin
- -- Collect the component clauses
+ 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;
+ 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;
+ Next_Component_Or_Discriminant (Comp);
+ end loop;
- -- Sort by ascending position number
+ -- Sort by ascending position number
- Sorting.Sort (Num_CC);
+ Sorting.Sort (Num_CC);
- -- We now have all the components whose size does not exceed
- -- the max machine scalar value, sorted by starting
- -- position. In this loop we gather groups of clauses
- -- starting at the same position, to process them in
- -- accordance with Ada 2005 AI-133.
+ -- We now have all the components whose size does not exceed
+ -- the max machine scalar value, sorted by starting position.
+ -- In this loop we gather groups of clauses starting at the
+ -- same position, to process them in accordance with AI-133.
- Stop := 0;
+ 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
- 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;
+ 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;
+ -- 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.
- -- 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:
+ -- 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.
- -- First_Bit .. Last_Bit Component_Bit_Offset
- -- old new old new
+ 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;
- -- 0 .. 0 7 .. 7 0 7
- -- 0 .. 1 6 .. 7 0 6
- -- 0 .. 2 5 .. 7 0 5
- -- 0 .. 7 0 .. 7 0 4
+ -- 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:
- -- 1 .. 1 6 .. 6 1 6
- -- 1 .. 4 3 .. 6 1 3
- -- 4 .. 7 0 .. 3 4 0
+ -- First_Bit .. Last_Bit Component_Bit_Offset
+ -- old new old new
- -- The general rule is that the first bit is obtained by
- -- subtracting the old ending bit from machine scalar
- -- size - 1.
+ -- 0 .. 0 7 .. 7 0 7
+ -- 0 .. 1 6 .. 7 0 6
+ -- 0 .. 2 5 .. 7 0 5
+ -- 0 .. 7 0 .. 7 0 4
- 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));
+ -- 1 .. 1 6 .. 6 1 6
+ -- 1 .. 4 3 .. 6 1 3
+ -- 4 .. 7 0 .. 3 4 0
- begin
- if Warn_On_Reverse_Bit_Order then
- Error_Msg_Uint_1 := MSS;
- Error_Msg_N
- ("info: reverse bit order in machine " &
- "scalar of length^?", First_Bit (CC));
- Error_Msg_Uint_1 := NFB;
- Error_Msg_Uint_2 := NLB;
-
- if Bytes_Big_Endian then
- Error_Msg_NE
- ("?\info: big-endian range for "
- & "component & is ^ .. ^",
- First_Bit (CC), Comp);
- else
- Error_Msg_NE
- ("?\info: little-endian range "
- & "for component & is ^ .. ^",
- First_Bit (CC), Comp);
- end if;
+ -- The rule is that the first bit is obtained by subtracting
+ -- the old ending bit from machine scalar size - 1.
+
+ for C in Start .. Stop loop
+ declare
+ Comp : constant Entity_Id := Comps (C);
+ CC : constant Node_Id :=
+ Component_Clause (Comp);
+ LB : constant Uint :=
+ Static_Integer (Last_Bit (CC));
+ NFB : constant Uint := MSS - Uint_1 - LB;
+ NLB : constant Uint := NFB + Esize (Comp) - 1;
+ Pos : constant Uint :=
+ Static_Integer (Position (CC));
+
+ begin
+ if Warn_On_Reverse_Bit_Order then
+ Error_Msg_Uint_1 := MSS;
+ Error_Msg_N
+ ("info: reverse bit order in machine " &
+ "scalar of length^?", First_Bit (CC));
+ Error_Msg_Uint_1 := NFB;
+ Error_Msg_Uint_2 := NLB;
+
+ if Bytes_Big_Endian then
+ Error_Msg_NE
+ ("?\info: big-endian range for "
+ & "component & is ^ .. ^",
+ First_Bit (CC), Comp);
+ else
+ Error_Msg_NE
+ ("?\info: 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;
+ Set_Component_Bit_Offset (Comp, Pos * SSU + NFB);
+ Set_Normalized_First_Bit (Comp, NFB mod SSU);
+ end;
end loop;
- end Sort_CC;
- end;
- end case;
+ end loop;
+ end Sort_CC;
+ end;
+ end if;
end Adjust_Record_For_Reverse_Bit_Order;
--------------------------------------
Attribute_Write =>
null;
- -- Other cases are errors, which will be caught below
+ -- Other cases are errors ("attribute& cannot be set with
+ -- definition clause"), which will be caught below.
when others =>
null;
when Attribute_Component_Size => Component_Size_Case : declare
Csize : constant Uint := Static_Integer (Expr);
+ Ctyp : Entity_Id;
Btype : Entity_Id;
Biased : Boolean;
New_Ctyp : Entity_Id;
end if;
Btype := Base_Type (U_Ent);
+ Ctyp := Component_Type (Btype);
if Has_Component_Size_Clause (Btype) then
Error_Msg_N
("component size clause for& previously given", Nam);
- elsif Csize /= No_Uint then
- Check_Size (Expr, Component_Type (Btype), Csize, Biased);
+ elsif Rep_Item_Too_Early (Btype, N) then
+ null;
- if Has_Aliased_Components (Btype)
- and then Csize < 32
- and then Csize /= 8
- and then Csize /= 16
- then
- Error_Msg_N
- ("component size incorrect for aliased components", N);
- return;
- end if;
+ elsif Csize /= No_Uint then
+ Check_Size (Expr, Ctyp, Csize, Biased);
-- For the biased case, build a declaration for a subtype
-- that will be used to represent the biased subtype that
Set_Esize (New_Ctyp, Csize);
Set_RM_Size (New_Ctyp, Csize);
Init_Alignment (New_Ctyp);
- Set_Has_Biased_Representation (New_Ctyp, True);
Set_Is_Itype (New_Ctyp, True);
Set_Associated_Node_For_Itype (New_Ctyp, U_Ent);
Set_Component_Type (Btype, New_Ctyp);
-
- if Warn_On_Biased_Representation then
- Error_Msg_N
- ("?component size clause forces biased "
- & "representation", N);
- end if;
+ Set_Biased (New_Ctyp, N, "component size clause");
end if;
Set_Component_Size (Btype, Csize);
end if;
end if;
+ -- Deal with warning on overridden size
+
+ if Warn_On_Overridden_Size
+ and then Has_Size_Clause (Ctyp)
+ and then RM_Size (Ctyp) /= Csize
+ then
+ Error_Msg_NE
+ ("?component size overrides size clause for&",
+ N, Ctyp);
+ end if;
+
Set_Has_Component_Size_Clause (Btype, True);
- Set_Has_Non_Standard_Rep (Btype, True);
+ Set_Has_Non_Standard_Rep (Btype, True);
end if;
end Component_Size_Case;
("size cannot be given for unconstrained array", Nam);
elsif Size /= No_Uint then
+
+ if VM_Target /= No_VM and then not GNAT_Mode then
+
+ -- Size clause is not handled properly on VM targets.
+ -- Display a warning unless we are in GNAT mode, in which
+ -- case this is useless.
+
+ Error_Msg_N
+ ("?size clauses are ignored in this configuration", N);
+ end if;
+
if Is_Type (U_Ent) then
Etyp := U_Ent;
else
or else Has_Small_Clause (U_Ent)
then
Check_Size (Expr, Etyp, Size, Biased);
- Set_Has_Biased_Representation (U_Ent, Biased);
-
- if Biased and Warn_On_Biased_Representation then
- Error_Msg_N
- ("?size clause forces biased representation", N);
- end if;
+ Set_Biased (U_Ent, N, "size clause", Biased);
end if;
-- For types set RM_Size and Esize if possible
if not Is_Entity_Name (Expr)
and then Is_Object_Reference (Expr)
then
- Pool :=
- Make_Defining_Identifier (Loc,
- Chars => New_Internal_Name ('P'));
+ Pool := Make_Temporary (Loc, 'P', Expr);
declare
Rnode : constant Node_Id :=
Defining_Identifier => Pool,
Subtype_Mark =>
New_Occurrence_Of (Etype (Expr), Loc),
- Name => Expr);
+ Name => Expr);
begin
Insert_Before (N, Rnode);
Error_Msg_N
("storage size clause for task is an " &
"obsolescent feature (RM J.9)?", N);
- Error_Msg_N
- ("\use Storage_Size pragma instead?", N);
+ Error_Msg_N ("\use Storage_Size pragma instead?", N);
end if;
FOnly := True;
return;
end if;
- if Compile_Time_Known_Value (Expr)
+ if Is_OK_Static_Expression (Expr)
and then Expr_Value (Expr) = 0
then
Set_No_Pool_Assigned (Btype);
else
if Is_Elementary_Type (U_Ent) then
Check_Size (Expr, U_Ent, Size, Biased);
- Set_Has_Biased_Representation (U_Ent, Biased);
-
- if Biased and Warn_On_Biased_Representation then
- Error_Msg_N
- ("?value size clause forces biased representation", N);
- end if;
+ Set_Biased (U_Ent, N, "value size clause", Biased);
end if;
Set_RM_Size (U_Ent, Size);
Val : Uint;
Err : Boolean := False;
- Lo : constant Uint := Expr_Value (Type_Low_Bound (Universal_Integer));
- Hi : constant Uint := Expr_Value (Type_High_Bound (Universal_Integer));
+ Lo : constant Uint := Expr_Value (Type_Low_Bound (Universal_Integer));
+ Hi : constant Uint := Expr_Value (Type_High_Bound (Universal_Integer));
+ -- Allowed range of universal integer (= allowed range of enum lit vals)
+
Min : Uint;
Max : Uint;
+ -- Minimum and maximum values of entries
+
+ Max_Node : Node_Id;
+ -- Pointer to node for literal providing max value
begin
if Ignore_Rep_Clauses then
Err := True;
end if;
- Set_Enumeration_Rep_Expr (Elit, Choice);
+ Set_Enumeration_Rep_Expr (Elit, Expression (Assoc));
Expr := Expression (Assoc);
Val := Static_Integer (Expr);
if Max /= No_Uint and then Val <= Max then
Error_Msg_NE
("enumeration value for& not ordered!",
- Enumeration_Rep_Expr (Elit), Elit);
+ Enumeration_Rep_Expr (Elit), Elit);
end if;
+ Max_Node := Enumeration_Rep_Expr (Elit);
Max := Val;
end if;
- -- If there is at least one literal whose representation
- -- is not equal to the Pos value, then note that this
- -- enumeration type has a non-standard representation.
+ -- If there is at least one literal whose representation is not
+ -- equal to the Pos value, then note that this enumeration type
+ -- has a non-standard representation.
if Val /= Enumeration_Pos (Elit) then
Set_Has_Non_Standard_Rep (Base_Type (Enumtype));
begin
if Has_Size_Clause (Enumtype) then
- if Esize (Enumtype) >= Minsize then
+
+ -- All OK, if size is OK now
+
+ if RM_Size (Enumtype) >= Minsize then
null;
else
+ -- Try if we can get by with biasing
+
Minsize :=
UI_From_Int (Minimum_Size (Enumtype, Biased => True));
- if Esize (Enumtype) < Minsize then
- Error_Msg_N ("previously given size is too small", N);
+ -- Error message if even biasing does not work
+
+ if RM_Size (Enumtype) < Minsize then
+ Error_Msg_Uint_1 := RM_Size (Enumtype);
+ Error_Msg_Uint_2 := Max;
+ Error_Msg_N
+ ("previously given size (^) is too small "
+ & "for this value (^)", Max_Node);
+
+ -- If biasing worked, indicate that we now have biased rep
else
- Set_Has_Biased_Representation (Enumtype);
+ Set_Biased
+ (Enumtype, Size_Clause (Enumtype), "size clause");
end if;
end if;
E : constant Entity_Id := Entity (N);
begin
+ -- Remember that we are processing a freezing entity. Required to
+ -- ensure correct decoration of internal entities associated with
+ -- interfaces (see New_Overloaded_Entity).
+
+ Inside_Freezing_Actions := Inside_Freezing_Actions + 1;
+
-- For tagged types covering interfaces add internal entities that link
-- the primitives of the interfaces with the primitives that cover them.
-
-- Note: These entities were originally generated only when generating
-- code because their main purpose was to provide support to initialize
-- the secondary dispatch tables. They are now generated also when
-- compiling with no code generation to provide ASIS the relationship
- -- between interface primitives and tagged type primitives.
+ -- between interface primitives and tagged type primitives. They are
+ -- also used to locate primitives covering interfaces when processing
+ -- generics (see Derive_Subprograms).
if Ada_Version >= Ada_05
and then Ekind (E) = E_Record_Type
and then not Is_Interface (E)
and then Has_Interfaces (E)
then
+ -- This would be a good common place to call the routine that checks
+ -- overriding of interface primitives (and thus factorize calls to
+ -- Check_Abstract_Overriding located at different contexts in the
+ -- compiler). However, this is not possible because it causes
+ -- spurious errors in case of late overriding.
+
Add_Internal_Interface_Entities (E);
end if;
+
+ -- Check CPP types
+
+ if Ekind (E) = E_Record_Type
+ and then Is_CPP_Class (E)
+ and then Is_Tagged_Type (E)
+ and then Tagged_Type_Expansion
+ and then Expander_Active
+ then
+ if CPP_Num_Prims (E) = 0 then
+
+ -- If the CPP type has user defined components then it must import
+ -- primitives from C++. This is required because if the C++ class
+ -- has no primitives then the C++ compiler does not added the _tag
+ -- component to the type.
+
+ pragma Assert (Chars (First_Entity (E)) = Name_uTag);
+
+ if First_Entity (E) /= Last_Entity (E) then
+ Error_Msg_N
+ ("?'C'P'P type must import at least one primitive from C++",
+ E);
+ end if;
+ end if;
+
+ -- Check that all its primitives are abstract or imported from C++.
+ -- Check also availability of the C++ constructor.
+
+ declare
+ Has_Constructors : constant Boolean := Has_CPP_Constructors (E);
+ Elmt : Elmt_Id;
+ Error_Reported : Boolean := False;
+ Prim : Node_Id;
+
+ begin
+ Elmt := First_Elmt (Primitive_Operations (E));
+ while Present (Elmt) loop
+ Prim := Node (Elmt);
+
+ if Comes_From_Source (Prim) then
+ if Is_Abstract_Subprogram (Prim) then
+ null;
+
+ elsif not Is_Imported (Prim)
+ or else Convention (Prim) /= Convention_CPP
+ then
+ Error_Msg_N
+ ("?primitives of 'C'P'P types must be imported from C++"
+ & " or abstract", Prim);
+
+ elsif not Has_Constructors
+ and then not Error_Reported
+ then
+ Error_Msg_Name_1 := Chars (E);
+ Error_Msg_N
+ ("?'C'P'P constructor required for type %", Prim);
+ Error_Reported := True;
+ end if;
+ end if;
+
+ Next_Elmt (Elmt);
+ end loop;
+ end;
+ end if;
+
+ Inside_Freezing_Actions := Inside_Freezing_Actions - 1;
end Analyze_Freeze_Entity;
------------------------------------------
-- for the remainder of this processing.
procedure Analyze_Record_Representation_Clause (N : Node_Id) is
- Ident : constant Node_Id := Identifier (N);
- Rectype : Entity_Id;
+ Ident : constant Node_Id := Identifier (N);
+ Biased : Boolean;
CC : Node_Id;
- Posit : Uint;
+ Comp : Entity_Id;
Fbit : Uint;
- Lbit : Uint;
Hbit : Uint := Uint_0;
- Comp : Entity_Id;
+ Lbit : Uint;
Ocomp : Entity_Id;
- Biased : Boolean;
+ Posit : Uint;
+ Rectype : Entity_Id;
CR_Pragma : Node_Id := Empty;
-- Points to N_Pragma node if Complete_Representation pragma present
("record type required, found}", Ident, First_Subtype (Rectype));
return;
- elsif Is_Unchecked_Union (Rectype) then
- Error_Msg_N
- ("record rep clause not allowed for Unchecked_Union", N);
-
elsif Scope (Rectype) /= Current_Scope then
Error_Msg_N ("type must be declared in this scope", N);
return;
Error_Msg_N
("component clause is for non-existent field", CC);
+ -- Ada 2012 (AI05-0026): Any name that denotes a
+ -- discriminant of an object of an unchecked union type
+ -- shall not occur within a record_representation_clause.
+
+ -- The general restriction of using record rep clauses on
+ -- Unchecked_Union types has now been lifted. Since it is
+ -- possible to introduce a record rep clause which mentions
+ -- the discriminant of an Unchecked_Union in non-Ada 2012
+ -- code, this check is applied to all versions of the
+ -- language.
+
+ elsif Ekind (Comp) = E_Discriminant
+ and then Is_Unchecked_Union (Rectype)
+ then
+ Error_Msg_N
+ ("cannot reference discriminant of Unchecked_Union",
+ Component_Name (CC));
+
elsif Present (Component_Clause (Comp)) then
-- Diagnose duplicate rep clause, or check consistency
Set_Normalized_First_Bit (Comp, Fbit mod SSU);
Set_Normalized_Position (Comp, Fbit / SSU);
+ if Warn_On_Overridden_Size
+ and then Has_Size_Clause (Etype (Comp))
+ and then RM_Size (Etype (Comp)) /= Esize (Comp)
+ then
+ Error_Msg_NE
+ ("?component size overrides size clause for&",
+ Component_Name (CC), Etype (Comp));
+ end if;
+
-- This information is also set in the corresponding
-- component of the base type, found by accessing the
-- Original_Record_Component link if it is present.
Esize (Comp),
Biased);
- Set_Has_Biased_Representation (Comp, Biased);
-
- if Biased and Warn_On_Biased_Representation then
- Error_Msg_F
- ("?component clause forces biased "
- & "representation", CC);
- end if;
+ Set_Biased
+ (Comp, First_Node (CC), "component clause", Biased);
if Present (Ocomp) then
Set_Component_Clause (Ocomp, CC);
Set_Normalized_Position_Max
(Ocomp, Normalized_Position (Ocomp));
+ -- Note: we don't use Set_Biased here, because we
+ -- already gave a warning above if needed, and we
+ -- would get a duplicate for the same name here.
+
Set_Has_Biased_Representation
(Ocomp, Has_Biased_Representation (Comp));
end if;
-- Start of processing for Check_Constant_Address_Clause
begin
- Check_Expr_Constants (Expr);
+ -- If rep_clauses are to be ignored, no need for legality checks. In
+ -- particular, no need to pester user about rep clauses that violate
+ -- the rule on constant addresses, given that these clauses will be
+ -- removed by Freeze before they reach the back end.
+
+ if not Ignore_Rep_Clauses then
+ Check_Expr_Constants (Expr);
+ end if;
end Check_Constant_Address_Clause;
----------------------------------------
Overlap_Check_Required : Boolean;
-- Used to keep track of whether or not an overlap check is required
+ Overlap_Detected : Boolean := False;
+ -- Set True if an overlap is detected
+
Ccount : Natural := 0;
-- Number of component clauses in record rep clause
procedure Check_Component_Overlap (C1_Ent, C2_Ent : Entity_Id) is
CC1 : constant Node_Id := Component_Clause (C1_Ent);
CC2 : constant Node_Id := Component_Clause (C2_Ent);
+
begin
if Present (CC1) and then Present (CC2) then
Error_Msg_Node_1 := Component_Name (CC1);
Error_Msg_N
("component& overlaps & #", Component_Name (CC1));
+ Overlap_Detected := True;
end if;
end;
end if;
if Present (Comp) then
Ccount := Ccount + 1;
+ -- We need a full overlap check if record positions non-monotonic
+
if Fbit <= Max_Bit_So_Far then
Overlap_Check_Required := True;
- else
- Max_Bit_So_Far := Lbit;
end if;
+ Max_Bit_So_Far := Lbit;
+
-- Check bit position out of range of specified size
if Has_Size_Clause (Rectype)
Error_Msg_NE
("component overlaps tag field of&",
Component_Name (CC), Rectype);
+ Overlap_Detected := True;
end if;
if Hbit < Lbit then
-- Skip overlap check if entity has no declaration node. This
-- happens with discriminants in constrained derived types.
- -- Probably we are missing some checks as a result, but that
- -- does not seem terribly serious ???
+ -- Possibly we are missing some checks as a result, but that
+ -- does not seem terribly serious.
if No (Declaration_Node (C1_Ent)) then
goto Continue_Main_Component_Loop;
else
Citem := First (Component_Items (Clist));
-
while Present (Citem) loop
if Nkind (Citem) = N_Component_Declaration then
C2_Ent := Defining_Identifier (Citem);
end Overlap_Check2;
end if;
+ -- The following circuit deals with warning on record holes (gaps). We
+ -- skip this check if overlap was detected, since it makes sense for the
+ -- programmer to fix this illegality before worrying about warnings.
+
+ if not Overlap_Detected and Warn_On_Record_Holes then
+ Record_Hole_Check : declare
+ Decl : constant Node_Id := Declaration_Node (Base_Type (Rectype));
+ -- Full declaration of record type
+
+ procedure Check_Component_List
+ (CL : Node_Id;
+ Sbit : Uint;
+ DS : List_Id);
+ -- Check component list CL for holes. The starting bit should be
+ -- Sbit. which is zero for the main record component list and set
+ -- appropriately for recursive calls for variants. DS is set to
+ -- a list of discriminant specifications to be included in the
+ -- consideration of components. It is No_List if none to consider.
+
+ --------------------------
+ -- Check_Component_List --
+ --------------------------
+
+ procedure Check_Component_List
+ (CL : Node_Id;
+ Sbit : Uint;
+ DS : List_Id)
+ is
+ Compl : Integer;
+
+ begin
+ Compl := Integer (List_Length (Component_Items (CL)));
+
+ if DS /= No_List then
+ Compl := Compl + Integer (List_Length (DS));
+ end if;
+
+ declare
+ Comps : array (Natural range 0 .. Compl) of Entity_Id;
+ -- Gather components (zero entry is for sort routine)
+
+ Ncomps : Natural := 0;
+ -- Number of entries stored in Comps (starting at Comps (1))
+
+ Citem : Node_Id;
+ -- One component item or discriminant specification
+
+ Nbit : Uint;
+ -- Starting bit for next component
+
+ CEnt : Entity_Id;
+ -- Component entity
+
+ Variant : Node_Id;
+ -- One variant
+
+ function Lt (Op1, Op2 : Natural) return Boolean;
+ -- Compare routine for Sort
+
+ procedure Move (From : Natural; To : Natural);
+ -- Move routine for Sort
+
+ package Sorting is new GNAT.Heap_Sort_G (Move, Lt);
+
+ --------
+ -- Lt --
+ --------
+
+ function Lt (Op1, Op2 : Natural) return Boolean is
+ begin
+ return Component_Bit_Offset (Comps (Op1))
+ <
+ Component_Bit_Offset (Comps (Op2));
+ end Lt;
+
+ ----------
+ -- Move --
+ ----------
+
+ procedure Move (From : Natural; To : Natural) is
+ begin
+ Comps (To) := Comps (From);
+ end Move;
+
+ begin
+ -- Gather discriminants into Comp
+
+ if DS /= No_List then
+ Citem := First (DS);
+ while Present (Citem) loop
+ if Nkind (Citem) = N_Discriminant_Specification then
+ declare
+ Ent : constant Entity_Id :=
+ Defining_Identifier (Citem);
+ begin
+ if Ekind (Ent) = E_Discriminant then
+ Ncomps := Ncomps + 1;
+ Comps (Ncomps) := Ent;
+ end if;
+ end;
+ end if;
+
+ Next (Citem);
+ end loop;
+ end if;
+
+ -- Gather component entities into Comp
+
+ Citem := First (Component_Items (CL));
+ while Present (Citem) loop
+ if Nkind (Citem) = N_Component_Declaration then
+ Ncomps := Ncomps + 1;
+ Comps (Ncomps) := Defining_Identifier (Citem);
+ end if;
+
+ Next (Citem);
+ end loop;
+
+ -- Now sort the component entities based on the first bit.
+ -- Note we already know there are no overlapping components.
+
+ Sorting.Sort (Ncomps);
+
+ -- Loop through entries checking for holes
+
+ Nbit := Sbit;
+ for J in 1 .. Ncomps loop
+ CEnt := Comps (J);
+ Error_Msg_Uint_1 := Component_Bit_Offset (CEnt) - Nbit;
+
+ if Error_Msg_Uint_1 > 0 then
+ Error_Msg_NE
+ ("?^-bit gap before component&",
+ Component_Name (Component_Clause (CEnt)), CEnt);
+ end if;
+
+ Nbit := Component_Bit_Offset (CEnt) + Esize (CEnt);
+ end loop;
+
+ -- Process variant parts recursively if present
+
+ if Present (Variant_Part (CL)) then
+ Variant := First (Variants (Variant_Part (CL)));
+ while Present (Variant) loop
+ Check_Component_List
+ (Component_List (Variant), Nbit, No_List);
+ Next (Variant);
+ end loop;
+ end if;
+ end;
+ end Check_Component_List;
+
+ -- Start of processing for Record_Hole_Check
+
+ begin
+ declare
+ Sbit : Uint;
+
+ begin
+ if Is_Tagged_Type (Rectype) then
+ Sbit := UI_From_Int (System_Address_Size);
+ else
+ Sbit := Uint_0;
+ end if;
+
+ if Nkind (Decl) = N_Full_Type_Declaration
+ and then Nkind (Type_Definition (Decl)) = N_Record_Definition
+ then
+ Check_Component_List
+ (Component_List (Type_Definition (Decl)),
+ Sbit,
+ Discriminant_Specifications (Decl));
+ end if;
+ end;
+ end Record_Hole_Check;
+ end if;
+
-- For records that have component clauses for all components, and whose
-- size is less than or equal to 32, we need to know the size in the
-- front end to activate possible packed array processing where the
procedure Initialize is
begin
+ Address_Clause_Checks.Init;
+ Independence_Checks.Init;
Unchecked_Conversions.Init;
end Initialize;
elsif Is_Type (T)
and then Is_Generic_Type (Root_Type (T))
then
- Error_Msg_N
- ("representation item not allowed for generic type", N);
+ Error_Msg_N ("representation item not allowed for generic type", N);
return True;
end if;
-- cases were already dealt with.
elsif Is_Enumeration_Type (T1) then
-
Enumeration_Case : declare
L1, L2 : Entity_Id;
end if;
end Same_Representation;
+ ----------------
+ -- Set_Biased --
+ ----------------
+
+ procedure Set_Biased
+ (E : Entity_Id;
+ N : Node_Id;
+ Msg : String;
+ Biased : Boolean := True)
+ is
+ begin
+ if Biased then
+ Set_Has_Biased_Representation (E);
+
+ if Warn_On_Biased_Representation then
+ Error_Msg_NE
+ ("?" & Msg & " forces biased representation for&", N, E);
+ end if;
+ end if;
+ end Set_Biased;
+
--------------------
-- Set_Enum_Esize --
--------------------
end loop;
end Validate_Address_Clauses;
+ ---------------------------
+ -- Validate_Independence --
+ ---------------------------
+
+ procedure Validate_Independence is
+ SU : constant Uint := UI_From_Int (System_Storage_Unit);
+ N : Node_Id;
+ E : Entity_Id;
+ IC : Boolean;
+ Comp : Entity_Id;
+ Addr : Node_Id;
+ P : Node_Id;
+
+ procedure Check_Array_Type (Atyp : Entity_Id);
+ -- Checks if the array type Atyp has independent components, and
+ -- if not, outputs an appropriate set of error messages.
+
+ procedure No_Independence;
+ -- Output message that independence cannot be guaranteed
+
+ function OK_Component (C : Entity_Id) return Boolean;
+ -- Checks one component to see if it is independently accessible, and
+ -- if so yields True, otherwise yields False if independent access
+ -- cannot be guaranteed. This is a conservative routine, it only
+ -- returns True if it knows for sure, it returns False if it knows
+ -- there is a problem, or it cannot be sure there is no problem.
+
+ procedure Reason_Bad_Component (C : Entity_Id);
+ -- Outputs continuation message if a reason can be determined for
+ -- the component C being bad.
+
+ ----------------------
+ -- Check_Array_Type --
+ ----------------------
+
+ procedure Check_Array_Type (Atyp : Entity_Id) is
+ Ctyp : constant Entity_Id := Component_Type (Atyp);
+
+ begin
+ -- OK if no alignment clause, no pack, and no component size
+
+ if not Has_Component_Size_Clause (Atyp)
+ and then not Has_Alignment_Clause (Atyp)
+ and then not Is_Packed (Atyp)
+ then
+ return;
+ end if;
+
+ -- Check actual component size
+
+ if not Known_Component_Size (Atyp)
+ or else not (Addressable (Component_Size (Atyp))
+ and then Component_Size (Atyp) < 64)
+ or else Component_Size (Atyp) mod Esize (Ctyp) /= 0
+ then
+ No_Independence;
+
+ -- Bad component size, check reason
+
+ if Has_Component_Size_Clause (Atyp) then
+ P :=
+ Get_Attribute_Definition_Clause
+ (Atyp, Attribute_Component_Size);
+
+ if Present (P) then
+ Error_Msg_Sloc := Sloc (P);
+ Error_Msg_N ("\because of Component_Size clause#", N);
+ return;
+ end if;
+ end if;
+
+ if Is_Packed (Atyp) then
+ P := Get_Rep_Pragma (Atyp, Name_Pack);
+
+ if Present (P) then
+ Error_Msg_Sloc := Sloc (P);
+ Error_Msg_N ("\because of pragma Pack#", N);
+ return;
+ end if;
+ end if;
+
+ -- No reason found, just return
+
+ return;
+ end if;
+
+ -- Array type is OK independence-wise
+
+ return;
+ end Check_Array_Type;
+
+ ---------------------
+ -- No_Independence --
+ ---------------------
+
+ procedure No_Independence is
+ begin
+ if Pragma_Name (N) = Name_Independent then
+ Error_Msg_NE
+ ("independence cannot be guaranteed for&", N, E);
+ else
+ Error_Msg_NE
+ ("independent components cannot be guaranteed for&", N, E);
+ end if;
+ end No_Independence;
+
+ ------------------
+ -- OK_Component --
+ ------------------
+
+ function OK_Component (C : Entity_Id) return Boolean is
+ Rec : constant Entity_Id := Scope (C);
+ Ctyp : constant Entity_Id := Etype (C);
+
+ begin
+ -- OK if no component clause, no Pack, and no alignment clause
+
+ if No (Component_Clause (C))
+ and then not Is_Packed (Rec)
+ and then not Has_Alignment_Clause (Rec)
+ then
+ return True;
+ end if;
+
+ -- Here we look at the actual component layout. A component is
+ -- addressable if its size is a multiple of the Esize of the
+ -- component type, and its starting position in the record has
+ -- appropriate alignment, and the record itself has appropriate
+ -- alignment to guarantee the component alignment.
+
+ -- Make sure sizes are static, always assume the worst for any
+ -- cases where we cannot check static values.
+
+ if not (Known_Static_Esize (C)
+ and then Known_Static_Esize (Ctyp))
+ then
+ return False;
+ end if;
+
+ -- Size of component must be addressable or greater than 64 bits
+ -- and a multiple of bytes.
+
+ if not Addressable (Esize (C))
+ and then Esize (C) < Uint_64
+ then
+ return False;
+ end if;
+
+ -- Check size is proper multiple
+
+ if Esize (C) mod Esize (Ctyp) /= 0 then
+ return False;
+ end if;
+
+ -- Check alignment of component is OK
+
+ if not Known_Component_Bit_Offset (C)
+ or else Component_Bit_Offset (C) < Uint_0
+ or else Component_Bit_Offset (C) mod Esize (Ctyp) /= 0
+ then
+ return False;
+ end if;
+
+ -- Check alignment of record type is OK
+
+ if not Known_Alignment (Rec)
+ or else (Alignment (Rec) * SU) mod Esize (Ctyp) /= 0
+ then
+ return False;
+ end if;
+
+ -- All tests passed, component is addressable
+
+ return True;
+ end OK_Component;
+
+ --------------------------
+ -- Reason_Bad_Component --
+ --------------------------
+
+ procedure Reason_Bad_Component (C : Entity_Id) is
+ Rec : constant Entity_Id := Scope (C);
+ Ctyp : constant Entity_Id := Etype (C);
+
+ begin
+ -- If component clause present assume that's the problem
+
+ if Present (Component_Clause (C)) then
+ Error_Msg_Sloc := Sloc (Component_Clause (C));
+ Error_Msg_N ("\because of Component_Clause#", N);
+ return;
+ end if;
+
+ -- If pragma Pack clause present, assume that's the problem
+
+ if Is_Packed (Rec) then
+ P := Get_Rep_Pragma (Rec, Name_Pack);
+
+ if Present (P) then
+ Error_Msg_Sloc := Sloc (P);
+ Error_Msg_N ("\because of pragma Pack#", N);
+ return;
+ end if;
+ end if;
+
+ -- See if record has bad alignment clause
+
+ if Has_Alignment_Clause (Rec)
+ and then Known_Alignment (Rec)
+ and then (Alignment (Rec) * SU) mod Esize (Ctyp) /= 0
+ then
+ P := Get_Attribute_Definition_Clause (Rec, Attribute_Alignment);
+
+ if Present (P) then
+ Error_Msg_Sloc := Sloc (P);
+ Error_Msg_N ("\because of Alignment clause#", N);
+ end if;
+ end if;
+
+ -- Couldn't find a reason, so return without a message
+
+ return;
+ end Reason_Bad_Component;
+
+ -- Start of processing for Validate_Independence
+
+ begin
+ for J in Independence_Checks.First .. Independence_Checks.Last loop
+ N := Independence_Checks.Table (J).N;
+ E := Independence_Checks.Table (J).E;
+ IC := Pragma_Name (N) = Name_Independent_Components;
+
+ -- Deal with component case
+
+ if Ekind (E) = E_Discriminant or else Ekind (E) = E_Component then
+ if not OK_Component (E) then
+ No_Independence;
+ Reason_Bad_Component (E);
+ goto Continue;
+ end if;
+ end if;
+
+ -- Deal with record with Independent_Components
+
+ if IC and then Is_Record_Type (E) then
+ Comp := First_Component_Or_Discriminant (E);
+ while Present (Comp) loop
+ if not OK_Component (Comp) then
+ No_Independence;
+ Reason_Bad_Component (Comp);
+ goto Continue;
+ end if;
+
+ Next_Component_Or_Discriminant (Comp);
+ end loop;
+ end if;
+
+ -- Deal with address clause case
+
+ if Is_Object (E) then
+ Addr := Address_Clause (E);
+
+ if Present (Addr) then
+ No_Independence;
+ Error_Msg_Sloc := Sloc (Addr);
+ Error_Msg_N ("\because of Address clause#", N);
+ goto Continue;
+ end if;
+ end if;
+
+ -- Deal with independent components for array type
+
+ if IC and then Is_Array_Type (E) then
+ Check_Array_Type (E);
+ end if;
+
+ -- Deal with independent components for array object
+
+ if IC and then Is_Object (E) and then Is_Array_Type (Etype (E)) then
+ Check_Array_Type (Etype (E));
+ end if;
+
+ <<Continue>> null;
+ end loop;
+ end Validate_Independence;
+
-----------------------------------
-- Validate_Unchecked_Conversion --
-----------------------------------
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