-- --
-- B o d y --
-- --
--- Copyright (C) 1992-2007, Free Software Foundation, Inc. --
+-- Copyright (C) 1992-2008, 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 Tbuild; use Tbuild;
with Urealp; use Urealp;
-with GNAT.Heap_Sort_A; use GNAT.Heap_Sort_A;
+with GNAT.Heap_Sort_G;
package body Sem_Ch13 is
procedure Alignment_Check_For_Esize_Change (Typ : Entity_Id);
-- This routine is called after setting the Esize of type entity Typ.
- -- The purpose is to deal with the situation where an aligment has been
+ -- The purpose is to deal with the situation where an alignment has been
-- inherited from a derived type that is no longer appropriate for the
-- new Esize value. In this case, we reset the Alignment to unknown.
procedure Check_Component_Overlap (C1_Ent, C2_Ent : Entity_Id);
-- Given two entities for record components or discriminants, checks
- -- if they hav overlapping component clauses and issues errors if so.
+ -- if they have overlapping component clauses and issues errors if so.
function Get_Alignment_Value (Expr : Node_Id) return Uint;
-- Given the expression for an alignment value, returns the corresponding
-- call to Validate_Unchecked_Conversions does the actual error
-- checking and posting of warnings. The reason for this delayed
-- processing is to take advantage of back-annotations of size and
- -- alignment values peformed by the back end.
+ -- alignment values performed by the back end.
type UC_Entry is record
Enode : Node_Id; -- node used for posting warnings
and then Attribute_Name (N) = Name_Address
then
declare
- Nam : Node_Id := Prefix (N);
+ P : Node_Id;
+
begin
- while False
- or else Nkind (Nam) = N_Selected_Component
- or else Nkind (Nam) = N_Indexed_Component
- loop
- Nam := Prefix (Nam);
+ P := Prefix (N);
+ while Nkind_In (P, N_Selected_Component, N_Indexed_Component) loop
+ P := Prefix (P);
end loop;
- if Is_Entity_Name (Nam) then
- return Entity (Nam);
+ if Is_Entity_Name (P) then
+ return Entity (P);
end if;
end;
end if;
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.
+ -- 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 (See GNAT.Heap_Sort_A)
+ -- Compare routine for Sort
procedure CP_Move (From : Natural; To : Natural);
- -- Move routine for Sort (see GNAT.Heap_Sort_A)
+ -- Move routine for Sort
+
+ package Sorting is new GNAT.Heap_Sort_G (CP_Move, CP_Lt);
Start : Natural;
Stop : Natural;
-- Sort by ascending position number
- Sort (Num_CC, CP_Move'Unrestricted_Access, CP_Lt'Unrestricted_Access);
+ 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
-- definition clause that is the preferred approach in Ada 95.
procedure Analyze_At_Clause (N : Node_Id) is
+ CS : constant Boolean := Comes_From_Source (N);
+
begin
+ -- This is an obsolescent feature
+
Check_Restriction (No_Obsolescent_Features, N);
if Warn_On_Obsolescent_Feature then
("\use address attribute definition clause instead?", N);
end if;
+ -- Rewrite as address clause
+
Rewrite (N,
Make_Attribute_Definition_Clause (Sloc (N),
Name => Identifier (N),
Chars => Name_Address,
Expression => Expression (N)));
+
+ -- We preserve Comes_From_Source, since logically the clause still
+ -- comes from the source program even though it is changed in form.
+
+ Set_Comes_From_Source (N, CS);
+
+ -- Analyze rewritten clause
+
Analyze_Attribute_Definition_Clause (N);
end Analyze_At_Clause;
-- Common processing for 'Read, 'Write, 'Input and 'Output attribute
-- definition clauses.
+ -----------------------------------
+ -- Analyze_Stream_TSS_Definition --
+ -----------------------------------
+
procedure Analyze_Stream_TSS_Definition (TSS_Nam : TSS_Name_Type) is
Subp : Entity_Id := Empty;
I : Interp_Index;
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
-- Address attribute definition clause
when Attribute_Address => Address : begin
+
+ -- A little error check, catch for X'Address use X'Address;
+
+ if Nkind (Nam) = N_Identifier
+ and then Nkind (Expr) = N_Attribute_Reference
+ and then Attribute_Name (Expr) = Name_Address
+ and then Nkind (Prefix (Expr)) = N_Identifier
+ and then Chars (Nam) = Chars (Prefix (Expr))
+ then
+ Error_Msg_NE
+ ("address for & is self-referencing", Prefix (Expr), Ent);
+ return;
+ end if;
+
+ -- Not that special case, carry on with analysis of expression
+
Analyze_And_Resolve (Expr, RTE (RE_Address));
if Present (Address_Clause (U_Ent)) then
-- We mark a possible modification of a variable with an
-- address clause, since it is likely aliasing is occurring.
- Note_Possible_Modification (Nam);
+ Note_Possible_Modification (Nam, Sure => False);
-- Here we are checking for explicit overlap of one variable
-- by another, and if we find this then mark the overlapped
-- If the address clause is of the form:
- -- for X'Address use Y'Address
+ -- for Y'Address use X'Address
-- or
- -- Const : constant Address := Y'Address;
+ -- Const : constant Address := X'Address;
-- ...
- -- for X'Address use Const;
+ -- for Y'Address use Const;
-- then we make an entry in the table for checking the size and
-- alignment of the overlaying variable. We defer this check
-- till after code generation to take full advantage of the
-- annotation done by the back end. This entry is only made if
-- we have not already posted a warning about size/alignment
- -- (some warnings of this type are posted in Checks).
+ -- (some warnings of this type are posted in Checks), and if
+ -- the address clause comes from source.
- if Address_Clause_Overlay_Warnings then
+ if Address_Clause_Overlay_Warnings
+ and then Comes_From_Source (N)
+ then
declare
Ent_X : Entity_Id := Empty;
Ent_Y : Entity_Id := Empty;
if Present (Ent_Y) and then Is_Entity_Name (Name (N)) then
Ent_X := Entity (Name (N));
- Address_Clause_Checks.Append ((N, Ent_X, Ent_Y));
+ Address_Clause_Checks.Append ((N, Ent_X, Ent_Y));
+
+ -- If variable overlays a constant view, and we are
+ -- warning on overlays, then mark the variable as
+ -- overlaying a constant (we will give warnings later
+ -- if this variable is assigned).
+
+ if Is_Constant_Object (Ent_Y)
+ and then Ekind (Ent_X) = E_Variable
+ then
+ Set_Overlays_Constant (Ent_X);
+ end if;
end if;
end;
end if;
if Has_Component_Size_Clause (Btype) then
Error_Msg_N
- ("component size clase for& previously given", Nam);
+ ("component size clause for& previously given", Nam);
elsif Csize /= No_Uint then
Check_Size (Expr, Component_Type (Btype), Csize, Biased);
-- that will be used to represent the biased subtype that
-- reflects the biased representation of components. We need
-- this subtype to get proper conversions on referencing
- -- elements of the array.
-
- if Biased then
- New_Ctyp :=
- Make_Defining_Identifier (Loc,
- Chars => New_External_Name (Chars (U_Ent), 'C', 0, 'T'));
-
- Decl :=
- Make_Subtype_Declaration (Loc,
- Defining_Identifier => New_Ctyp,
- Subtype_Indication =>
- New_Occurrence_Of (Component_Type (Btype), Loc));
-
- Set_Parent (Decl, N);
- Analyze (Decl, Suppress => All_Checks);
-
- Set_Has_Delayed_Freeze (New_Ctyp, False);
- 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);
+ -- elements of the array. Note that component size clauses
+ -- are ignored in VM mode.
+
+ if VM_Target = No_VM then
+ if Biased then
+ New_Ctyp :=
+ Make_Defining_Identifier (Loc,
+ Chars =>
+ New_External_Name (Chars (U_Ent), 'C', 0, 'T'));
+
+ Decl :=
+ Make_Subtype_Declaration (Loc,
+ Defining_Identifier => New_Ctyp,
+ Subtype_Indication =>
+ New_Occurrence_Of (Component_Type (Btype), Loc));
+
+ Set_Parent (Decl, N);
+ Analyze (Decl, Suppress => All_Checks);
+
+ Set_Has_Delayed_Freeze (New_Ctyp, False);
+ 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);
+ end if;
+
+ Set_Component_Size (Btype, Csize);
+
+ -- For VM case, we ignore component size clauses
+
+ else
+ -- Give a warning unless we are in GNAT mode, in which case
+ -- the warning is suppressed since it is not useful.
+
+ if not GNAT_Mode then
+ Error_Msg_N
+ ("?component size ignored in this configuration", N);
+ end if;
end if;
- Set_Component_Size (Btype, Csize);
Set_Has_Component_Size_Clause (Btype, True);
Set_Has_Non_Standard_Rep (Btype, True);
end if;
if VM_Target = No_VM then
Set_Has_External_Tag_Rep_Clause (U_Ent);
- else
+ elsif not Inspector_Mode then
Error_Msg_Name_1 := Attr;
Error_Msg_N
("% attribute unsupported in this configuration", Nam);
-- Object_Size attribute definition clause
when Attribute_Object_Size => Object_Size : declare
- Size : constant Uint := Static_Integer (Expr);
+ Size : constant Uint := Static_Integer (Expr);
+
Biased : Boolean;
+ pragma Warnings (Off, Biased);
begin
if not Is_Type (U_Ent) then
-- The Stack_Bounded_Pool is used internally for implementing
-- access types with a Storage_Size. Since it only work
-- properly when used on one specific type, we need to check
- -- that it is not highjacked improperly:
+ -- that it is not hijacked improperly:
-- type T is access Integer;
-- for T'Storage_Size use n;
-- type Q is access Float;
while Present (Decl) loop
DeclO := Original_Node (Decl);
if Comes_From_Source (DeclO)
- and then Nkind (DeclO) /= N_Pragma
- and then Nkind (DeclO) /= N_Use_Package_Clause
- and then Nkind (DeclO) /= N_Use_Type_Clause
- and then Nkind (DeclO) /= N_Implicit_Label_Declaration
+ and not Nkind_In (DeclO, N_Pragma,
+ N_Use_Package_Clause,
+ N_Use_Type_Clause,
+ N_Implicit_Label_Declaration)
then
Error_Msg_N
("this declaration not allowed in machine code subprogram",
while Present (Stmt) loop
StmtO := Original_Node (Stmt);
if Comes_From_Source (StmtO)
- and then Nkind (StmtO) /= N_Pragma
- and then Nkind (StmtO) /= N_Label
- and then Nkind (StmtO) /= N_Code_Statement
+ and then not Nkind_In (StmtO, N_Pragma,
+ N_Label,
+ N_Code_Statement)
then
Error_Msg_N
("this statement is not allowed in machine code subprogram",
-- 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
+ elsif Is_Standard_Character_Type (Enumtype) then
Error_Msg_N ("enumeration rep clause not allowed for this type", N);
return;
end;
end if;
- -- Clear any existing component clauses for the type (this happens with
- -- derived types, where we are now overriding the original).
+ -- For untagged types, clear any existing component clauses for the
+ -- type. If the type is derived, this is what allows us to override
+ -- a rep clause for the parent. For type extensions, the representation
+ -- of the inherited components is inherited, so we want to keep previous
+ -- component clauses for completeness.
- Comp := First_Component_Or_Discriminant (Rectype);
- while Present (Comp) loop
- Set_Component_Clause (Comp, Empty);
- Next_Component_Or_Discriminant (Comp);
- end loop;
+ if not Is_Tagged_Type (Rectype) then
+ Comp := First_Component_Or_Discriminant (Rectype);
+ while Present (Comp) loop
+ Set_Component_Clause (Comp, Empty);
+ Next_Component_Or_Discriminant (Comp);
+ end loop;
+ end if;
-- All done if no component clauses
-- The only pragma of interest is Complete_Representation
- if Chars (CC) = Name_Complete_Representation then
+ if Pragma_Name (CC) = Name_Complete_Representation then
CR_Pragma := CC;
end if;
Error_Msg_N
("first bit cannot be negative", First_Bit (CC));
+ -- The Last_Bit specified in a component clause must not be
+ -- less than the First_Bit minus one (RM-13.5.1(10)).
+
+ elsif Lbit < Fbit - 1 then
+ Error_Msg_N
+ ("last bit cannot be less than first bit minus one",
+ Last_Bit (CC));
+
-- Values look OK, so find the corresponding record component
-- Even though the syntax allows an attribute reference for
-- implementation-defined components, GNAT does not allow the
("component clause is for non-existent field", CC);
elsif Present (Component_Clause (Comp)) then
- Error_Msg_Sloc := Sloc (Component_Clause (Comp));
- Error_Msg_N
- ("component clause previously given#", CC);
+
+ -- Diagnose duplicate rep clause, or check consistency
+ -- if this is an inherited component. In a double fault,
+ -- there may be a duplicate inconsistent clause for an
+ -- inherited component.
+
+ if Scope (Original_Record_Component (Comp)) = Rectype
+ or else Parent (Component_Clause (Comp)) = N
+ then
+ Error_Msg_Sloc := Sloc (Component_Clause (Comp));
+ Error_Msg_N ("component clause previously given#", CC);
+
+ else
+ declare
+ Rep1 : constant Node_Id := Component_Clause (Comp);
+ begin
+ if Intval (Position (Rep1)) /=
+ Intval (Position (CC))
+ or else Intval (First_Bit (Rep1)) /=
+ Intval (First_Bit (CC))
+ or else Intval (Last_Bit (Rep1)) /=
+ Intval (Last_Bit (CC))
+ then
+ Error_Msg_N ("component clause inconsistent "
+ & "with representation of ancestor", CC);
+ elsif Warn_On_Redundant_Constructs then
+ Error_Msg_N ("?redundant component clause "
+ & "for inherited component!", CC);
+ end if;
+ end;
+ end if;
else
-- Make reference for field in record rep clause and set
end loop;
-- Now that we have processed all the component clauses, check for
- -- overlap. We have to leave this till last, since the components
- -- can appear in any arbitrary order in the representation clause.
+ -- overlap. We have to leave this till last, since the components can
+ -- appear in any arbitrary order in the representation clause.
-- We do not need this check if all specified ranges were monotonic,
-- as recorded by Overlap_Check_Required being False at this stage.
- -- This first section checks if there are any overlapping entries
- -- at all. It does this by sorting all entries and then seeing if
- -- there are any overlaps. If there are none, then that is decisive,
- -- but if there are overlaps, they may still be OK (they may result
- -- from fields in different variants).
+ -- This first section checks if there are any overlapping entries at
+ -- all. It does this by sorting all entries and then seeing if there are
+ -- any overlaps. If there are none, then that is decisive, but if there
+ -- are overlaps, they may still be OK (they may result from fields in
+ -- different variants).
if Overlap_Check_Required then
Overlap_Check1 : declare
OC_Fbit : array (0 .. Ccount) of Uint;
- -- First-bit values for component clauses, the value is the
- -- offset of the first bit of the field from start of record.
- -- The zero entry is for use in sorting.
+ -- First-bit values for component clauses, the value is the offset
+ -- of the first bit of the field from start of record. The zero
+ -- entry is for use in sorting.
OC_Lbit : array (0 .. Ccount) of Uint;
- -- Last-bit values for component clauses, the value is the
- -- offset of the last bit of the field from start of record.
- -- The zero entry is for use in sorting.
+ -- Last-bit values for component clauses, the value is the offset
+ -- of the last bit of the field from start of record. The zero
+ -- entry is for use in sorting.
OC_Count : Natural := 0;
-- Count of entries in OC_Fbit and OC_Lbit
function OC_Lt (Op1, Op2 : Natural) return Boolean;
- -- Compare routine for Sort (See GNAT.Heap_Sort_A)
+ -- Compare routine for Sort
procedure OC_Move (From : Natural; To : Natural);
- -- Move routine for Sort (see GNAT.Heap_Sort_A)
+ -- Move routine for Sort
+
+ package Sorting is new GNAT.Heap_Sort_G (OC_Move, OC_Lt);
function OC_Lt (Op1, Op2 : Natural) return Boolean is
begin
Next (CC);
end loop;
- Sort
- (OC_Count,
- OC_Move'Unrestricted_Access,
- OC_Lt'Unrestricted_Access);
+ Sorting.Sort (OC_Count);
Overlap_Check_Required := False;
for J in 1 .. OC_Count - 1 loop
end Overlap_Check1;
end if;
- -- If Overlap_Check_Required is still True, then we have to do
- -- the full scale overlap check, since we have at least two fields
- -- that do overlap, and we need to know if that is OK since they
- -- are in the same variant, or whether we have a definite problem
+ -- If Overlap_Check_Required is still True, then we have to do the full
+ -- scale overlap check, since we have at least two fields that do
+ -- overlap, and we need to know if that is OK since they are in
+ -- different variant, or whether we have a definite problem.
if Overlap_Check_Required then
Overlap_Check2 : declare
-- Loop through all components in record. For each component check
-- for overlap with any of the preceding elements on the component
- -- list containing the component, and also, if the component is in
+ -- list containing the component and also, if the component is in
-- a variant, check against components outside the case structure.
-- This latter test is repeated recursively up the variant tree.
Component_List_Loop : loop
-- If derived type definition, go to full declaration
- -- If at outer level, check discriminants if there are any
+ -- If at outer level, check discriminants if there are any.
if Nkind (Clist) = N_Derived_Type_Definition then
Clist := Parent (Clist);
-- Outer level of record definition, check discriminants
- if Nkind (Clist) = N_Full_Type_Declaration
- or else Nkind (Clist) = N_Private_Type_Declaration
+ if Nkind_In (Clist, N_Full_Type_Declaration,
+ N_Private_Type_Declaration)
then
if Has_Discriminants (Defining_Identifier (Clist)) then
C2_Ent :=
-- be a variant, in which case its parent is a variant part,
-- and the parent of the variant part is a component list
-- whose components must all be checked against the current
- -- component for overlap.
+ -- component for overlap).
if Nkind (Parent (Clist)) = N_Variant then
Clist := Parent (Parent (Parent (Clist)));
-- Check for possible discriminant part in record, this is
-- treated essentially as another level in the recursion.
- -- For this case we have the parent of the component list
- -- is the record definition, and its parent is the full
- -- type declaration which contains the discriminant
- -- specifications.
+ -- For this case the parent of the component list is the
+ -- record definition, and its parent is the full type
+ -- declaration containing the discriminant specifications.
elsif Nkind (Parent (Clist)) = N_Record_Definition then
Clist := Parent (Parent ((Clist)));
-- If neither of these two cases, we are at the top of
- -- the tree
+ -- the tree.
else
exit Component_List_Loop;
end Overlap_Check2;
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 component type is a record.
+ -- 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
+ -- component type is a record.
- -- At this stage Hbit + 1 represents the first unused bit from all
- -- the component clauses processed, so if the component clauses are
+ -- At this stage Hbit + 1 represents the first unused bit from all the
+ -- component clauses processed, so if the component clauses are
-- complete, then this is the length of the record.
- -- For records longer than System.Storage_Unit, and for those where
- -- not all components have component clauses, the back end determines
- -- the length (it may for example be appopriate to round up the size
- -- to some convenient boundary, based on alignment considerations etc).
+ -- For records longer than System.Storage_Unit, and for those where not
+ -- all components have component clauses, the back end determines the
+ -- length (it may for example be appropriate to round up the size
+ -- to some convenient boundary, based on alignment considerations, etc).
- if Unknown_RM_Size (Rectype)
- and then Hbit + 1 <= 32
- then
- -- Nothing to do if at least one component with no component clause
+ if Unknown_RM_Size (Rectype) and then Hbit + 1 <= 32 then
+
+ -- Nothing to do if at least one component has no component clause
Comp := First_Component_Or_Discriminant (Rectype);
while Present (Comp) loop
-- If no Complete_Representation pragma, warn if missing components
- elsif Warn_On_Unrepped_Components
- and then not Warnings_Off (Rectype)
- then
+ elsif Warn_On_Unrepped_Components then
declare
Num_Repped_Components : Nat := 0;
Num_Unrepped_Components : Nat := 0;
-- We are only interested in the case where there is at least one
-- unrepped component, and at least half the components have rep
-- clauses. We figure that if less than half have them, then the
- -- partial rep clause is really intentional.
+ -- partial rep clause is really intentional. If the component
+ -- type has no underlying type set at this point (as for a generic
+ -- formal type), we don't know enough to give a warning on the
+ -- component.
if Num_Unrepped_Components > 0
and then Num_Unrepped_Components < Num_Repped_Components
Comp := First_Component_Or_Discriminant (Rectype);
while Present (Comp) loop
if No (Component_Clause (Comp))
+ and then Comes_From_Source (Comp)
+ and then Present (Underlying_Type (Etype (Comp)))
and then (Is_Scalar_Type (Underlying_Type (Etype (Comp)))
or else Size_Known_At_Compile_Time
(Underlying_Type (Etype (Comp))))
+ and then not Has_Warnings_Off (Rectype)
then
Error_Msg_Sloc := Sloc (Comp);
Error_Msg_NE
if Present (Component_Clause (C1_Ent))
and then Present (Component_Clause (C2_Ent))
then
- -- Exclude odd case where we have two tag fields in the same
- -- record, both at location zero. This seems a bit strange,
- -- but it seems to happen in some circumstances ???
+ -- Exclude odd case where we have two tag fields in the same record,
+ -- both at location zero. This seems a bit strange, but it seems to
+ -- happen in some circumstances ???
if Chars (C1_Ent) = Name_uTag
and then Chars (C2_Ent) = Name_uTag
U_Ent : Entity_Id)
is
procedure Check_At_Constant_Address (Nod : Node_Id);
- -- Checks that the given node N represents a name whose 'Address
- -- is constant (in the same sense as OK_Constant_Address_Clause,
- -- i.e. the address value is the same at the point of declaration
- -- of U_Ent and at the time of elaboration of the address clause.
+ -- Checks that the given node N represents a name whose 'Address is
+ -- constant (in the same sense as OK_Constant_Address_Clause, i.e. the
+ -- address value is the same at the point of declaration of U_Ent and at
+ -- the time of elaboration of the address clause.
procedure Check_Expr_Constants (Nod : Node_Id);
- -- Checks that Nod meets the requirements for a constant address
- -- clause in the sense of the enclosing procedure.
+ -- Checks that Nod meets the requirements for a constant address clause
+ -- in the sense of the enclosing procedure.
procedure Check_List_Constants (Lst : List_Id);
-- Check that all elements of list Lst meet the requirements for a
-- If the node is an object declaration without initial
-- value, some code has been expanded, and the expression
-- is not constant, even if the constituents might be
- -- acceptable, as in A'Address + offset.
+ -- acceptable, as in A'Address + offset.
if Ekind (Ent) = E_Variable
- and then Nkind (Declaration_Node (Ent))
- = N_Object_Declaration
+ and then
+ Nkind (Declaration_Node (Ent)) = N_Object_Declaration
and then
No (Expression (Declaration_Node (Ent)))
then
or else
Ekind (Ent) = E_In_Parameter
then
- -- This is the case where we must have Ent defined
- -- before U_Ent. Clearly if they are in different
- -- units this requirement is met since the unit
- -- containing Ent is already processed.
+ -- This is the case where we must have Ent defined before
+ -- U_Ent. Clearly if they are in different units this
+ -- requirement is met since the unit containing Ent is
+ -- already processed.
if not In_Same_Source_Unit (Ent, U_Ent) then
return;
- -- Otherwise location of Ent must be before the
- -- location of U_Ent, that's what prior defined means.
+ -- Otherwise location of Ent must be before the location
+ -- of U_Ent, that's what prior defined means.
elsif Sloc (Ent) < Loc_U_Ent then
return;
when N_Unchecked_Type_Conversion =>
Check_Expr_Constants (Expression (Nod));
- -- If this is a rewritten unchecked conversion, subtypes
- -- in this node are those created within the instance.
- -- To avoid order of elaboration issues, replace them
- -- with their base types. Note that address clauses can
- -- cause order of elaboration problems because they are
- -- elaborated by the back-end at the point of definition,
- -- and may mention entities declared in between (as long
- -- as everything is static). It is user-friendly to allow
- -- unchecked conversions in this context.
+ -- If this is a rewritten unchecked conversion, subtypes in
+ -- this node are those created within the instance. To avoid
+ -- order of elaboration issues, replace them with their base
+ -- types. Note that address clauses can cause order of
+ -- elaboration problems because they are elaborated by the
+ -- back-end at the point of definition, and may mention
+ -- entities declared in between (as long as everything is
+ -- static). It is user-friendly to allow unchecked conversions
+ -- in this context.
if Nkind (Original_Node (Nod)) = N_Function_Call then
Set_Etype (Expression (Nod),
if Siz < M then
-- Size is less than minimum size, but one possibility remains
- -- that we can manage with the new size if we bias the type
+ -- that we can manage with the new size if we bias the type.
M := UI_From_Int (Minimum_Size (UT, Biased => True));
else
declare
Id : constant Attribute_Id := Get_Attribute_Id (Chars (N));
-
begin
- return Id = Attribute_Input
+ return Id = Attribute_Input
or else Id = Attribute_Output
or else Id = Attribute_Read
or else Id = Attribute_Write
-- we have short and long addresses, and it is possible for an access
-- type to have a short address size (and thus be less than the size
-- of System.Address itself). We simply skip the check for VMS, and
- -- leave the back end to do the check.
+ -- leave it to the back end to do the check.
elsif Is_Access_Type (T) then
if OpenVMS_On_Target then
elsif Is_Discrete_Type (T) then
- -- The following loop is looking for the nearest compile time
- -- known bounds following the ancestor subtype chain. The idea
- -- is to find the most restrictive known bounds information.
+ -- The following loop is looking for the nearest compile time known
+ -- bounds following the ancestor subtype chain. The idea is to find
+ -- the most restrictive known bounds information.
Ancest := T;
loop
end loop;
-- Fixed-point types. We can't simply use Expr_Value to get the
- -- Corresponding_Integer_Value values of the bounds, since these
- -- do not get set till the type is frozen, and this routine can
- -- be called before the type is frozen. Similarly the test for
- -- bounds being static needs to include the case where we have
- -- unanalyzed real literals for the same reason.
+ -- Corresponding_Integer_Value values of the bounds, since these do not
+ -- get set till the type is frozen, and this routine can be called
+ -- before the type is frozen. Similarly the test for bounds being static
+ -- needs to include the case where we have unanalyzed real literals for
+ -- the same reason.
elsif Is_Fixed_Point_Type (T) then
- -- The following loop is looking for the nearest compile time
- -- known bounds following the ancestor subtype chain. The idea
- -- is to find the most restrictive known bounds information.
+ -- The following loop is looking for the nearest compile time known
+ -- bounds following the ancestor subtype chain. The idea is to find
+ -- the most restrictive known bounds information.
Ancest := T;
loop
return 0;
end if;
+ -- Note: In the following two tests for LoSet and HiSet, it may
+ -- seem redundant to test for N_Real_Literal here since normally
+ -- one would assume that the test for the value being known at
+ -- compile time includes this case. However, there is a glitch.
+ -- If the real literal comes from folding a non-static expression,
+ -- then we don't consider any non- static expression to be known
+ -- at compile time if we are in configurable run time mode (needed
+ -- in some cases to give a clearer definition of what is and what
+ -- is not accepted). So the test is indeed needed. Without it, we
+ -- would set neither Lo_Set nor Hi_Set and get an infinite loop.
+
if not LoSet then
if Nkind (Type_Low_Bound (Ancest)) = N_Real_Literal
or else Compile_Time_Known_Value (Type_Low_Bound (Ancest))
end if;
-- Signed case. Note that we consider types like range 1 .. -1 to be
- -- signed for the purpose of computing the size, since the bounds
- -- have to be accomodated in the base type.
+ -- signed for the purpose of computing the size, since the bounds have
+ -- to be accommodated in the base type.
if Lo < 0 or else Hi < 0 then
S := 1;
return True;
end if;
- -- Otherwise check for incompleted type
+ -- Otherwise check for incomplete type
if Is_Incomplete_Or_Private_Type (T)
and then No (Underlying_Type (T))
("representation item must be after full type declaration", N);
return True;
- -- If the type has incompleted components, a representation clause is
+ -- If the type has incomplete components, a representation clause is
-- illegal but stream attributes and Convention pragmas are correct.
elsif Has_Private_Component (T) then
end if;
end if;
- -- No error, link item into head of chain of rep items for the entity
+ -- No error, link item into head of chain of rep items for the entity,
+ -- but avoid chaining if we have an overloadable entity, and the pragma
+ -- is one that can apply to multiple overloaded entities.
+
+ if Is_Overloadable (T)
+ and then Nkind (N) = N_Pragma
+ then
+ declare
+ Pname : constant Name_Id := Pragma_Name (N);
+ begin
+ if Pname = Name_Convention or else
+ Pname = Name_Import or else
+ Pname = Name_Export or else
+ Pname = Name_External or else
+ Pname = Name_Interface
+ then
+ return False;
+ end if;
+ end;
+ end if;
Record_Rep_Item (T, N);
return False;
return not Has_Non_Standard_Rep (T2);
end if;
- -- Here the two types both have non-standard representation, and we
- -- need to determine if they have the same non-standard representation
+ -- Here the two types both have non-standard representation, and we need
+ -- to determine if they have the same non-standard representation.
-- For arrays, we simply need to test if the component sizes are the
-- same. Pragma Pack is reflected in modified component sizes, so this
-- For enumeration types, we must check each literal to see if the
-- representation is the same. Note that we do not permit enumeration
- -- reprsentation clauses for Character and Wide_Character, so these
+ -- representation clauses for Character and Wide_Character, so these
-- cases were already dealt with.
elsif Is_Enumeration_Type (T1) then
Target := Ancestor_Subtype (Etype (Act_Unit));
- -- If either type is generic, the instantiation happens within a
- -- generic unit, and there is nothing to check. The proper check
+ -- If either type is generic, the instantiation happens within a generic
+ -- unit, and there is nothing to check. The proper check
-- will happen when the enclosing generic is instantiated.
if Is_Generic_Type (Source) or else Is_Generic_Type (Target) then
and then Convention (Target) /= Convention (Source)
and then Warn_On_Unchecked_Conversion
then
- Error_Msg_N
- ("?conversion between pointers with different conventions!", N);
+ -- Give warnings for subprogram pointers only on most targets. The
+ -- exception is VMS, where data pointers can have different lengths
+ -- depending on the pointer convention.
+
+ if Is_Access_Subprogram_Type (Target)
+ or else Is_Access_Subprogram_Type (Source)
+ or else OpenVMS_On_Target
+ then
+ Error_Msg_N
+ ("?conversion between pointers with different conventions!", N);
+ end if;
+ end if;
+
+ -- Warn if one of the operands is Ada.Calendar.Time. Do not emit a
+ -- warning when compiling GNAT-related sources.
+
+ if Warn_On_Unchecked_Conversion
+ and then not In_Predefined_Unit (N)
+ and then RTU_Loaded (Ada_Calendar)
+ and then
+ (Chars (Source) = Name_Time
+ or else
+ Chars (Target) = Name_Time)
+ then
+ -- If Ada.Calendar is loaded and the name of one of the operands is
+ -- Time, there is a good chance that this is Ada.Calendar.Time.
+
+ declare
+ Calendar_Time : constant Entity_Id :=
+ Full_View (RTE (RO_CA_Time));
+ begin
+ pragma Assert (Present (Calendar_Time));
+
+ if Source = Calendar_Time
+ or else Target = Calendar_Time
+ then
+ Error_Msg_N
+ ("?representation of 'Time values may change between " &
+ "'G'N'A'T versions", N);
+ end if;
+ end;
end if;
- -- Make entry in unchecked conversion table for later processing
- -- by Validate_Unchecked_Conversions, which will check sizes and
- -- alignments (using values set by the back-end where possible).
- -- This is only done if the appropriate warning is active
+ -- Make entry in unchecked conversion table for later processing by
+ -- Validate_Unchecked_Conversions, which will check sizes and alignments
+ -- (using values set by the back-end where possible). This is only done
+ -- if the appropriate warning is active.
if Warn_On_Unchecked_Conversion then
Unchecked_Conversions.Append
end if;
end if;
- -- If unchecked conversion to access type, and access type is
- -- declared in the same unit as the unchecked conversion, then
- -- set the No_Strict_Aliasing flag (no strict aliasing is
- -- implicit in this situation).
+ -- If unchecked conversion to access type, and access type is declared
+ -- in the same unit as the unchecked conversion, then set the
+ -- No_Strict_Aliasing flag (no strict aliasing is implicit in this
+ -- situation).
if Is_Access_Type (Target) and then
In_Same_Source_Unit (Target, N)
-- Generate N_Validate_Unchecked_Conversion node for back end in
-- case the back end needs to perform special validation checks.
- -- Shouldn't this be in exp_ch13, since the check only gets done
+ -- Shouldn't this be in Exp_Ch13, since the check only gets done
-- if we have full expansion and the back end is called ???
Vnode :=
Set_Source_Type (Vnode, Source);
Set_Target_Type (Vnode, Target);
- -- If the unchecked conversion node is in a list, just insert before
- -- it. If not we have some strange case, not worth bothering about.
+ -- If the unchecked conversion node is in a list, just insert before it.
+ -- If not we have some strange case, not worth bothering about.
if Is_List_Member (N) then
Insert_After (N, Vnode);
Target_Siz : Uint;
begin
- -- This validation check, which warns if we have unequal sizes
- -- for unchecked conversion, and thus potentially implementation
+ -- This validation check, which warns if we have unequal sizes for
+ -- unchecked conversion, and thus potentially implementation
-- dependent semantics, is one of the few occasions on which we
- -- use the official RM size instead of Esize. See description
- -- in Einfo "Handling of Type'Size Values" for details.
+ -- use the official RM size instead of Esize. See description in
+ -- Einfo "Handling of Type'Size Values" for details.
if Serious_Errors_Detected = 0
and then Known_Static_RM_Size (Source)
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