From: Ronan Desplanques <[email protected]>
Before this patch, confirming Stream_Size aspect specifications on
elementary types were incorrectly rejected when the stream size was 128,
and the error messages emitted for Stream_Size aspect errors gave
incorrect possible values.
This patch fixes this. The most significant part of the fix is a new
subprogram in Exp_Strm, Get_Primitives, that makes it possible to
retrieve a precise list of supported stream sizes, but also to select
the right runtime streaming primitives for a given type. Using the
latter, this patch factorizes code that was present in both
Build_Elementary_Input_Call and Build_Elementary_Write_Call.
gcc/ada/ChangeLog:
* exp_strm.ads (Get_Primitives): New function.
* exp_strm.adb (Get_Primitives): Likewise.
(Build_Elementary_Input_Call, Build_Elementary_Write_Call): use
Get_Primitives.
(Has_Stream_Standard_Rep): Add formal parameter and rename to...
(Is_Stream_Standard_Rep): New function.
* sem_ch13.adb (Analyze_Attribute_Definition_Clause): Fix error
emission.
Tested on x86_64-pc-linux-gnu, committed on master.
---
gcc/ada/exp_strm.adb | 447 +++++++++++++++----------------------------
gcc/ada/exp_strm.ads | 30 +++
gcc/ada/sem_ch13.adb | 74 ++++---
3 files changed, 234 insertions(+), 317 deletions(-)
diff --git a/gcc/ada/exp_strm.adb b/gcc/ada/exp_strm.adb
index 5e1c9134fb57..3bb6966dc1c2 100644
--- a/gcc/ada/exp_strm.adb
+++ b/gcc/ada/exp_strm.adb
@@ -33,7 +33,6 @@ with Mutably_Tagged; use Mutably_Tagged;
with Namet; use Namet;
with Nlists; use Nlists;
with Nmake; use Nmake;
-with Rtsfind; use Rtsfind;
with Sem_Aux; use Sem_Aux;
with Sem_Util; use Sem_Util;
with Sinfo; use Sinfo;
@@ -43,7 +42,6 @@ with Snames; use Snames;
with Stand; use Stand;
with Tbuild; use Tbuild;
with Ttypes; use Ttypes;
-with Uintp; use Uintp;
package body Exp_Strm is
@@ -82,13 +80,13 @@ package body Exp_Strm is
-- Decls and Stms are the declarations and statements for the body and
-- The parameter Fnam is the name of the constructed function.
- function Has_Stream_Standard_Rep (U_Type : Entity_Id) return Boolean;
- -- This function is used to test the type U_Type, to determine if it has
- -- a standard representation from a streaming point of view. Standard means
- -- that it has a standard representation (e.g. no enumeration rep clause),
- -- and the size of the root type is the same as the streaming size (which
- -- is defined as value specified by a Stream_Size clause if present, or
- -- the Esize of U_Type if not).
+ function Is_Stream_Standard_Rep
+ (U_Type : Entity_Id; S_Size : Uint) return Boolean;
+ -- This function is used to test the type U_Type, to determine whether it
+ -- would have a standard representation from a streaming point of view if
+ -- its Stream_Size attribute was set to S_Size. Standard means that it has
+ -- a standard representation (e.g. no enumeration rep clause), and the size
+ -- of the root type is the same as the stream size.
function Make_Stream_Subprogram_Name
(Loc : Source_Ptr;
@@ -436,51 +434,39 @@ package body Exp_Strm is
Build_Array_Read_Write_Procedure (Typ, Decl, Pnam, Name_Write);
end Build_Array_Write_Procedure;
- ---------------------------------
- -- Build_Elementary_Input_Call --
- ---------------------------------
+ function Get_Primitives
+ (P_Type : Entity_Id; P_Size : Uint) return Primitive_Result
+ is
- function Build_Elementary_Input_Call (N : Node_Id) return Node_Id is
- Loc : constant Source_Ptr := Sloc (N);
- P_Type : constant Entity_Id := Entity (Prefix (N));
- U_Type : constant Entity_Id := Underlying_Type (P_Type);
- Rt_Type : constant Entity_Id := Root_Type (U_Type);
- FST : constant Entity_Id := First_Subtype (U_Type);
- Strm : constant Node_Id := First (Expressions (N));
- Targ : constant Node_Id := Next (Strm);
- P_Size : constant Uint := Get_Stream_Size (FST);
- Res : Node_Id;
- Lib_RE : RE_Id;
+ function Prims (Input, Write : RE_Id) return Primitive_Result;
+ function Prims (Input, Write : RE_Id) return Primitive_Result is
+ begin
+ return (Primitives, 0, Input, Write);
+ end Prims;
+ function PSizes (L : Sizes) return Primitive_Result;
+ function PSizes (L : Sizes) return Primitive_Result is
+ begin
+ return (Possible_Sizes, L'Length, L);
+ end PSizes;
+
+ U_Type : constant Entity_Id := Underlying_Type (P_Type);
+ FST : constant Entity_Id := First_Subtype (U_Type);
+ Rt_Type : constant Entity_Id := Root_Type (U_Type);
+
+ Rep_Is_Standard : constant Boolean :=
+ Known_RM_Size (U_Type)
+ and then Is_Stream_Standard_Rep (U_Type, P_Size);
begin
- -- Check first for Boolean and Character. These are enumeration types,
- -- but we treat them specially, since they may require special handling
- -- in the transfer protocol. However, this special handling only applies
- -- if they have standard representation, otherwise they are treated like
- -- any other enumeration type.
-
- if Rt_Type = Standard_Boolean
- and then Has_Stream_Standard_Rep (U_Type)
+ if Rt_Type = Standard_Boolean and then Rep_Is_Standard then
+ return Prims (RE_I_B, RE_W_B);
+ elsif Rt_Type = Standard_Character and then Rep_Is_Standard then
+ return Prims (RE_I_C, RE_W_C);
+ elsif Rt_Type = Standard_Wide_Character and then Rep_Is_Standard then
+ return Prims (RE_I_WC, RE_W_WC);
+ elsif Rt_Type = Standard_Wide_Wide_Character and then Rep_Is_Standard
then
- Lib_RE := RE_I_B;
-
- elsif Rt_Type = Standard_Character
- and then Has_Stream_Standard_Rep (U_Type)
- then
- Lib_RE := RE_I_C;
-
- elsif Rt_Type = Standard_Wide_Character
- and then Has_Stream_Standard_Rep (U_Type)
- then
- Lib_RE := RE_I_WC;
-
- elsif Rt_Type = Standard_Wide_Wide_Character
- and then Has_Stream_Standard_Rep (U_Type)
- then
- Lib_RE := RE_I_WWC;
-
- -- Floating point types
-
+ return Prims (RE_I_WWC, RE_W_WWC);
elsif Is_Floating_Point_Type (U_Type) then
-- Question: should we use P_Size or Rt_Type to distinguish between
@@ -500,23 +486,30 @@ package body Exp_Strm is
-- To deal with these two requirements we add the special checks
-- on equal sizes and use the root type to distinguish.
- if P_Size <= Standard_Short_Float_Size
+ if P_Size = Standard_Short_Float_Size
and then (Standard_Short_Float_Size /= Standard_Float_Size
or else Rt_Type = Standard_Short_Float)
then
- Lib_RE := RE_I_SF;
+ return Prims (RE_I_SF, RE_W_SF);
- elsif P_Size <= Standard_Float_Size then
- Lib_RE := RE_I_F;
+ elsif P_Size = Standard_Float_Size then
+ return Prims (RE_I_F, RE_W_F);
- elsif P_Size <= Standard_Long_Float_Size
+ elsif P_Size = Standard_Long_Float_Size
and then (Standard_Long_Float_Size /= Standard_Long_Long_Float_Size
- or else Rt_Type = Standard_Long_Float)
+ or else Rt_Type = Standard_Long_Float)
then
- Lib_RE := RE_I_LF;
+ return Prims (RE_I_LF, RE_W_LF);
+ elsif P_Size = Standard_Long_Long_Float_Size then
+ return Prims (RE_I_LLF, RE_W_LLF);
else
- Lib_RE := RE_I_LLF;
+ return
+ PSizes
+ ((Standard_Short_Float_Size,
+ Standard_Float_Size,
+ Standard_Long_Float_Size,
+ Standard_Long_Long_Float_Size));
end if;
-- Signed integer types. Also includes signed fixed-point types and
@@ -548,35 +541,42 @@ package body Exp_Strm is
-- The following set of tests gets repeated many times, we should
-- have an abstraction defined ???
- and then
- (Is_Fixed_Point_Type (U_Type)
- or else
- Is_Enumeration_Type (U_Type)
- or else
- (Is_Signed_Integer_Type (U_Type)
- and then not Has_Biased_Representation (FST)))
+ and then (Is_Fixed_Point_Type (U_Type)
+ or else Is_Enumeration_Type (U_Type)
+ or else (Is_Signed_Integer_Type (U_Type)
+ and then not Has_Biased_Representation (FST)))
then
- if P_Size <= Standard_Short_Short_Integer_Size then
- Lib_RE := RE_I_SSI;
+ if P_Size = Standard_Short_Short_Integer_Size then
+ return Prims (RE_I_SSI, RE_W_SSI);
- elsif P_Size <= Standard_Short_Integer_Size then
- Lib_RE := RE_I_SI;
+ elsif P_Size = Standard_Short_Integer_Size then
+ return Prims (RE_I_SI, RE_W_SI);
elsif P_Size = 24 then
- Lib_RE := RE_I_I24;
+ return Prims (RE_I_I24, RE_W_I24);
- elsif P_Size <= Standard_Integer_Size then
- Lib_RE := RE_I_I;
+ elsif P_Size = Standard_Integer_Size then
+ return Prims (RE_I_I, RE_W_I);
- elsif P_Size <= Standard_Long_Integer_Size then
- Lib_RE := RE_I_LI;
+ elsif P_Size = Standard_Long_Integer_Size then
+ return Prims (RE_I_LI, RE_W_LI);
- elsif P_Size <= Standard_Long_Long_Integer_Size then
- Lib_RE := RE_I_LLI;
+ elsif P_Size = Standard_Long_Long_Integer_Size then
+ return Prims (RE_I_LLI, RE_W_LLI);
+ elsif P_Size = Standard_Long_Long_Long_Integer_Size then
+ return Prims (RE_I_LLLI, RE_W_LLLI);
else
- Lib_RE := RE_I_LLLI;
+ return
+ PSizes
+ ((Standard_Short_Short_Integer_Size,
+ Standard_Short_Integer_Size,
+ 24,
+ Standard_Integer_Size,
+ Standard_Long_Integer_Size,
+ Standard_Long_Long_Integer_Size,
+ Standard_Long_Long_Long_Integer_Size));
end if;
-- Unsigned integer types, also includes unsigned fixed-point types
@@ -586,41 +586,74 @@ package body Exp_Strm is
-- Also includes signed integer types that are unsigned in the sense
-- that they do not include negative numbers. See above for details.
- elsif Is_Modular_Integer_Type (U_Type)
- or else Is_Fixed_Point_Type (U_Type)
- or else Is_Enumeration_Type (U_Type)
+ elsif Is_Modular_Integer_Type (U_Type)
+ or else Is_Fixed_Point_Type (U_Type)
+ or else Is_Enumeration_Type (U_Type)
or else Is_Signed_Integer_Type (U_Type)
then
- if P_Size <= Standard_Short_Short_Integer_Size then
- Lib_RE := RE_I_SSU;
+ if P_Size = Standard_Short_Short_Integer_Size then
+ return Prims (RE_I_SSU, RE_W_SSU);
- elsif P_Size <= Standard_Short_Integer_Size then
- Lib_RE := RE_I_SU;
+ elsif P_Size = Standard_Short_Integer_Size then
+ return Prims (RE_I_SU, RE_W_SU);
elsif P_Size = 24 then
- Lib_RE := RE_I_U24;
+ return Prims (RE_I_U24, RE_W_U24);
- elsif P_Size <= Standard_Integer_Size then
- Lib_RE := RE_I_U;
+ elsif P_Size = Standard_Integer_Size then
+ return Prims (RE_I_U, RE_W_U);
- elsif P_Size <= Standard_Long_Integer_Size then
- Lib_RE := RE_I_LU;
+ elsif P_Size = Standard_Long_Integer_Size then
+ return Prims (RE_I_LU, RE_W_LU);
- elsif P_Size <= Standard_Long_Long_Integer_Size then
- Lib_RE := RE_I_LLU;
+ elsif P_Size = Standard_Long_Long_Integer_Size then
+ return Prims (RE_I_LLU, RE_W_LLU);
+
+ elsif P_Size = Standard_Long_Long_Long_Integer_Size then
+ return Prims (RE_I_LLLU, RE_W_LLLU);
else
- Lib_RE := RE_I_LLLU;
+ return
+ PSizes
+ ((Standard_Short_Short_Integer_Size,
+ Standard_Short_Integer_Size,
+ 24,
+ Standard_Integer_Size,
+ Standard_Long_Integer_Size,
+ Standard_Long_Long_Integer_Size,
+ Standard_Long_Long_Long_Integer_Size));
end if;
else pragma Assert (Is_Access_Type (U_Type));
if Present (P_Size) and then P_Size > System_Address_Size then
- Lib_RE := RE_I_AD;
+ return Prims (RE_I_AD, RE_W_AD);
else
- Lib_RE := RE_I_AS;
+ return Prims (RE_I_AS, RE_W_AS);
end if;
end if;
+ end Get_Primitives;
+ ---------------------------------
+ -- Build_Elementary_Input_Call --
+ ---------------------------------
+
+ function Build_Elementary_Input_Call (N : Node_Id) return Node_Id is
+ Loc : constant Source_Ptr := Sloc (N);
+ P_Type : constant Entity_Id := Entity (Prefix (N));
+ U_Type : constant Entity_Id := Underlying_Type (P_Type);
+ FST : constant Entity_Id := First_Subtype (U_Type);
+ Strm : constant Node_Id := First (Expressions (N));
+ Targ : constant Node_Id := Next (Strm);
+ P_Size : constant Uint := Get_Stream_Size (FST);
+ Res : Node_Id;
+
+ Prims : constant Primitive_Result := Get_Primitives (P_Type, P_Size);
+
+ Lib_RE : constant RE_Id :=
+ (case Prims.S is
+ when Primitives => Prims.Input,
+ when others => raise Program_Error);
+ begin
-- Call the function, and do an unchecked conversion of the result
-- to the actual type of the prefix. If the target is a discriminant,
-- and we are in the body of the default implementation of a 'Read
@@ -679,191 +712,22 @@ package body Exp_Strm is
function Build_Elementary_Write_Call (N : Node_Id) return Node_Id is
Loc : constant Source_Ptr := Sloc (N);
- P_Type : constant Entity_Id := Entity (Prefix (N));
- U_Type : constant Entity_Id := Underlying_Type (P_Type);
- Rt_Type : constant Entity_Id := Root_Type (U_Type);
- FST : constant Entity_Id := First_Subtype (U_Type);
- Strm : constant Node_Id := First (Expressions (N));
- Item : constant Node_Id := Next (Strm);
- P_Size : Uint;
- Lib_RE : RE_Id;
+ P_Type : constant Entity_Id := Entity (Prefix (N));
+ U_Type : constant Entity_Id := Underlying_Type (P_Type);
+ FST : constant Entity_Id := First_Subtype (U_Type);
+ Strm : constant Node_Id := First (Expressions (N));
+ Item : constant Node_Id := Next (Strm);
+ P_Size : constant Uint := Get_Stream_Size (FST);
Libent : Entity_Id;
+ Prims : constant Primitive_Result := Get_Primitives (P_Type, P_Size);
+
+ Lib_RE : constant RE_Id :=
+ (case Prims.S is
+ when Primitives => Prims.Write,
+ when others => raise Program_Error);
begin
- -- Compute the size of the stream element. This is either the size of
- -- the first subtype or if given the size of the Stream_Size attribute.
-
- if Has_Stream_Size_Clause (FST) then
- P_Size := Static_Integer (Expression (Stream_Size_Clause (FST)));
- else
- P_Size := Esize (FST);
- end if;
-
- -- Find the routine to be called
-
- -- Check for First Boolean and Character. These are enumeration types,
- -- but we treat them specially, since they may require special handling
- -- in the transfer protocol. However, this special handling only applies
- -- if they have standard representation, otherwise they are treated like
- -- any other enumeration type.
-
- if Rt_Type = Standard_Boolean
- and then Has_Stream_Standard_Rep (U_Type)
- then
- Lib_RE := RE_W_B;
-
- elsif Rt_Type = Standard_Character
- and then Has_Stream_Standard_Rep (U_Type)
- then
- Lib_RE := RE_W_C;
-
- elsif Rt_Type = Standard_Wide_Character
- and then Has_Stream_Standard_Rep (U_Type)
- then
- Lib_RE := RE_W_WC;
-
- elsif Rt_Type = Standard_Wide_Wide_Character
- and then Has_Stream_Standard_Rep (U_Type)
- then
- Lib_RE := RE_W_WWC;
-
- -- Floating point types
-
- elsif Is_Floating_Point_Type (U_Type) then
-
- -- Question: should we use P_Size or Rt_Type to distinguish between
- -- possible floating point types? If a non-standard size or a stream
- -- size is specified, then we should certainly use the size. But if
- -- we have two types the same (notably Short_Float_Size = Float_Size
- -- which is close to universally true, and Long_Long_Float_Size =
- -- Long_Float_Size, true on most targets except the x86), then we
- -- would really rather use the root type, so that if people want to
- -- fiddle with System.Stream_Attributes to get inter-target portable
- -- streams, they get the size they expect. Consider in particular the
- -- case of a stream written on an x86, with 96-bit Long_Long_Float
- -- being read into a non-x86 target with 64 bit Long_Long_Float. A
- -- special version of System.Stream_Attributes can deal with this
- -- provided the proper type is always used.
-
- -- To deal with these two requirements we add the special checks
- -- on equal sizes and use the root type to distinguish.
-
- if P_Size <= Standard_Short_Float_Size
- and then (Standard_Short_Float_Size /= Standard_Float_Size
- or else Rt_Type = Standard_Short_Float)
- then
- Lib_RE := RE_W_SF;
-
- elsif P_Size <= Standard_Float_Size then
- Lib_RE := RE_W_F;
-
- elsif P_Size <= Standard_Long_Float_Size
- and then (Standard_Long_Float_Size /= Standard_Long_Long_Float_Size
- or else Rt_Type = Standard_Long_Float)
- then
- Lib_RE := RE_W_LF;
-
- else
- Lib_RE := RE_W_LLF;
- end if;
-
- -- Signed integer types. Also includes signed fixed-point types and
- -- signed enumeration types share this circuitry.
-
- -- Note on signed integer types. We do not consider types as signed for
- -- this purpose if they have no negative numbers, or if they have biased
- -- representation. The reason is that the value in either case basically
- -- represents an unsigned value.
-
- -- For example, consider:
-
- -- type W is range 0 .. 2**32 - 1;
- -- for W'Size use 32;
-
- -- This is a signed type, but the representation is unsigned, and may
- -- be outside the range of a 32-bit signed integer, so this must be
- -- treated as 32-bit unsigned.
-
- -- Similarly, the representation is also unsigned if we have:
-
- -- type W is range -1 .. +254;
- -- for W'Size use 8;
-
- -- forcing a biased and unsigned representation
-
- elsif not Is_Unsigned_Type (FST)
- and then
- (Is_Fixed_Point_Type (U_Type)
- or else
- Is_Enumeration_Type (U_Type)
- or else
- (Is_Signed_Integer_Type (U_Type)
- and then not Has_Biased_Representation (FST)))
- then
- if P_Size <= Standard_Short_Short_Integer_Size then
- Lib_RE := RE_W_SSI;
-
- elsif P_Size <= Standard_Short_Integer_Size then
- Lib_RE := RE_W_SI;
-
- elsif P_Size = 24 then
- Lib_RE := RE_W_I24;
-
- elsif P_Size <= Standard_Integer_Size then
- Lib_RE := RE_W_I;
-
- elsif P_Size <= Standard_Long_Integer_Size then
- Lib_RE := RE_W_LI;
-
- elsif P_Size <= Standard_Long_Long_Integer_Size then
- Lib_RE := RE_W_LLI;
-
- else
- Lib_RE := RE_W_LLLI;
- end if;
-
- -- Unsigned integer types, also includes unsigned fixed-point types
- -- and unsigned enumeration types (note we know they are unsigned
- -- because we already tested for signed above).
-
- -- Also includes signed integer types that are unsigned in the sense
- -- that they do not include negative numbers. See above for details.
-
- elsif Is_Modular_Integer_Type (U_Type)
- or else Is_Fixed_Point_Type (U_Type)
- or else Is_Enumeration_Type (U_Type)
- or else Is_Signed_Integer_Type (U_Type)
- then
- if P_Size <= Standard_Short_Short_Integer_Size then
- Lib_RE := RE_W_SSU;
-
- elsif P_Size <= Standard_Short_Integer_Size then
- Lib_RE := RE_W_SU;
-
- elsif P_Size = 24 then
- Lib_RE := RE_W_U24;
-
- elsif P_Size <= Standard_Integer_Size then
- Lib_RE := RE_W_U;
-
- elsif P_Size <= Standard_Long_Integer_Size then
- Lib_RE := RE_W_LU;
-
- elsif P_Size <= Standard_Long_Long_Integer_Size then
- Lib_RE := RE_W_LLU;
-
- else
- Lib_RE := RE_W_LLLU;
- end if;
-
- else pragma Assert (Is_Access_Type (U_Type));
-
- if Present (P_Size) and then P_Size > System_Address_Size then
- Lib_RE := RE_W_AD;
- else
- Lib_RE := RE_W_AS;
- end if;
- end if;
+ pragma Assert (Prims.S = Primitives);
-- Unchecked-convert parameter to the required type (i.e. the type of
-- the corresponding parameter, and call the appropriate routine.
@@ -871,12 +735,15 @@ package body Exp_Strm is
Libent := RTE (Lib_RE);
return
- Make_Procedure_Call_Statement (Loc,
- Name => New_Occurrence_Of (Libent, Loc),
- Parameter_Associations => New_List (
- Relocate_Node (Strm),
- Unchecked_Convert_To (Etype (Next_Formal (First_Formal (Libent))),
- Relocate_Node (Item))));
+ Make_Procedure_Call_Statement
+ (Loc,
+ Name => New_Occurrence_Of (Libent, Loc),
+ Parameter_Associations =>
+ New_List
+ (Relocate_Node (Strm),
+ Unchecked_Convert_To
+ (Etype (Next_Formal (First_Formal (Libent))),
+ Relocate_Node (Item))));
end Build_Elementary_Write_Call;
-----------------------------------------
@@ -1766,22 +1633,15 @@ package body Exp_Strm is
-- Has_Stream_Standard_Rep --
-----------------------------
- function Has_Stream_Standard_Rep (U_Type : Entity_Id) return Boolean is
- Siz : Uint;
-
+ function Is_Stream_Standard_Rep
+ (U_Type : Entity_Id; S_Size : Uint) return Boolean is
begin
if Has_Non_Standard_Rep (U_Type) then
return False;
end if;
- if Has_Stream_Size_Clause (U_Type) then
- Siz := Static_Integer (Expression (Stream_Size_Clause (U_Type)));
- else
- Siz := Esize (First_Subtype (U_Type));
- end if;
-
- return Siz = Esize (Root_Type (U_Type));
- end Has_Stream_Standard_Rep;
+ return S_Size = Esize (Root_Type (U_Type));
+ end Is_Stream_Standard_Rep;
---------------------------------
-- Make_Stream_Subprogram_Name --
@@ -1827,5 +1687,4 @@ package body Exp_Strm is
return Base_Type (E);
end if;
end Stream_Base_Type;
-
end Exp_Strm;
diff --git a/gcc/ada/exp_strm.ads b/gcc/ada/exp_strm.ads
index 733cf9c0dd19..54eded5d61df 100644
--- a/gcc/ada/exp_strm.ads
+++ b/gcc/ada/exp_strm.ads
@@ -26,7 +26,9 @@
-- Routines to build stream subprograms for composite types
with Exp_Tss; use Exp_Tss;
+with Rtsfind; use Rtsfind;
with Types; use Types;
+with Uintp; use Uintp;
package Exp_Strm is
@@ -138,4 +140,32 @@ package Exp_Strm is
-- always null), and Pnam is the name of the constructed procedure.
-- Used by Exp_Dist to generate stream-oriented attributes for RACWs.
+ type Status is (Primitives, Possible_Sizes);
+
+ type Sizes is array (Positive range <>) of Nat;
+
+ type Primitive_Result
+ (S : Status;
+ Len : Natural)
+ is record
+ case S is
+ when Primitives =>
+ Input : RE_Id;
+ Write : RE_Id;
+
+ when Possible_Sizes =>
+ List : Sizes (1 .. Len);
+ end case;
+ end record;
+
+ --------------------
+ -- Get_Primitives --
+ --------------------
+
+ function Get_Primitives
+ (P_Type : Entity_Id; P_Size : Uint) return Primitive_Result;
+ -- If P_Type supports a stream size of P_Size, returns the corresponding
+ -- input and write primitives. Otherwise, returns a list of the stream
+ -- sizes P_Type supports, in nondecreasing order and with possible
+ -- duplicates.
end Exp_Strm;
diff --git a/gcc/ada/sem_ch13.adb b/gcc/ada/sem_ch13.adb
index 2166eb318d75..22fea0d02907 100644
--- a/gcc/ada/sem_ch13.adb
+++ b/gcc/ada/sem_ch13.adb
@@ -37,6 +37,7 @@ with Errid; use Errid;
with Errout; use Errout;
with Exp_Ch3; use Exp_Ch3;
with Exp_Disp; use Exp_Disp;
+with Exp_Strm; use Exp_Strm;
with Exp_Tss; use Exp_Tss;
with Exp_Util; use Exp_Util;
with Expander; use Expander;
@@ -8366,32 +8367,59 @@ package body Sem_Ch13 is
if Duplicate_Clause then
null;
-
+ elsif No (Size) then
+ Error_Msg_N ("invalid argument for Stream_Size aspect", Nam);
elsif Is_Elementary_Type (U_Ent) then
- -- Size will be empty if we already detected an error
- -- (e.g. Expr is of the wrong type); we might as well
- -- give the useful hint below even in that case.
-
- if No (Size) or else
- (Size /= System_Storage_Unit
- and then Size /= System_Storage_Unit * 2
- and then Size /= System_Storage_Unit * 3
- and then Size /= System_Storage_Unit * 4
- and then Size /= System_Storage_Unit * 8)
- then
- Error_Msg_N
- ("stream size for elementary type must be 8, 16, 24, " &
- "32 or 64", N);
-
- elsif Known_RM_Size (U_Ent) and then RM_Size (U_Ent) > Size then
- Error_Msg_Uint_1 := RM_Size (U_Ent);
- Error_Msg_N
- ("stream size for elementary type must be 8, 16, 24, " &
- "32 or 64 and at least ^", N);
- end if;
-
Set_Has_Stream_Size_Clause (U_Ent);
+ declare
+ Minimum_Size : constant Uint :=
+ (if Known_RM_Size (U_Ent)
+ then RM_Size (U_Ent)
+ else Uint_0);
+
+ Size_Or_Zero : constant Uint :=
+ (if Size < Minimum_Size then Uint_0 else Size);
+ -- If the requested size is smaller than the RM size of the
+ -- type, we pass zero to Get_Primitives. That will always
+ -- give us the list of supported sizes we need to report an
+ -- error.
+
+ P : constant Primitive_Result :=
+ Get_Primitives (U_Ent, Size_Or_Zero);
+
+ Error_Text : Bounded_String;
+
+ In_First_Iteration : Boolean := True;
+ Previous_Value : Nat := 0;
+ begin
+ case P.S is
+ when Possible_Sizes =>
+ Error_Msg_N ("unsupported stream size", N);
+
+ Append
+ (Error_Text,
+ "\supported stream sizes for this type: ");
+ for Sz of P.List loop
+ if Minimum_Size <= Sz and then Sz /= Previous_Value
+ then
+ if In_First_Iteration then
+ In_First_Iteration := False;
+ else
+ Append (Error_Text, ", ");
+ end if;
+
+ Append (Error_Text, Sz);
+
+ Previous_Value := Sz;
+ end if;
+ end loop;
+ Error_Msg_N (To_String (Error_Text), N);
+
+ when others =>
+ null;
+ end case;
+ end;
else
Error_Msg_N ("Stream_Size cannot be given for &", Nam);
end if;
--
2.43.0
