-- the activation Chain. Note: Master_Actual can be Empty, but only if
-- there are no tasks.
+ function Caller_Known_Size
+ (Func_Call : Node_Id; Result_Subt : Entity_Id) return Boolean;
+ -- True if result subtype is definite, or has a size that does not require
+ -- secondary stack usage (i.e. no variant part or components whose type
+ -- depends on discriminants). In particular, untagged types with only
+ -- access discriminants do not require secondary stack use. Note we must
+ -- always use the secondary stack for dispatching-on-result calls.
+
procedure Check_Overriding_Operation (Subp : Entity_Id);
-- Subp is a dispatching operation. Check whether it may override an
-- inherited private operation, in which case its DT entry is that of
return New_Body;
end Build_Procedure_Body_Form;
+ -----------------------
+ -- Caller_Known_Size --
+ -----------------------
+
+ function Caller_Known_Size
+ (Func_Call : Node_Id; Result_Subt : Entity_Id) return Boolean is
+ begin
+ return (Is_Definite_Subtype (Underlying_Type (Result_Subt))
+ and then No (Controlling_Argument (Func_Call)))
+ or else not Requires_Transient_Scope (Underlying_Type (Result_Subt));
+ end Caller_Known_Size;
+
--------------------------------
-- Check_Overriding_Operation --
--------------------------------
Expr : Node_Id;
Obj : Node_Id;
Obj_Typ : Entity_Id;
- Var : Node_Id;
+ Var : constant Node_Id := Unqual_Conv (Act);
Var_Id : Entity_Id;
begin
- Var := Act;
-
- -- Use the expression when the context qualifies a reference in some
- -- fashion.
-
- while Nkind_In (Var, N_Qualified_Expression,
- N_Type_Conversion,
- N_Unchecked_Type_Conversion)
- loop
- Var := Expression (Var);
- end loop;
-
-- Copy the value of the validation variable back into the object
-- being validated.
Discrim_Source := Original_Node (Discrim_Source);
end if;
- while Nkind_In (Discrim_Source, N_Qualified_Expression,
- N_Type_Conversion,
- N_Unchecked_Type_Conversion)
- loop
- Discrim_Source := Expression (Discrim_Source);
- end loop;
+ Discrim_Source := Unqual_Conv (Discrim_Source);
case Nkind (Discrim_Source) is
when N_Defining_Identifier =>
-------------------------------------
function Is_Build_In_Place_Function_Call (N : Node_Id) return Boolean is
- Exp_Node : Node_Id := N;
+ Exp_Node : constant Node_Id := Unqual_Conv (N);
Function_Id : Entity_Id;
begin
return False;
end if;
- -- Step past qualification, type conversion (which can occur in actual
- -- parameter contexts), and unchecked conversion (which can occur in
- -- cases of calls to 'Input).
-
- if Nkind_In (Exp_Node, N_Qualified_Expression,
- N_Type_Conversion,
- N_Unchecked_Type_Conversion)
- then
- Exp_Node := Expression (N);
- end if;
-
if Nkind (Exp_Node) /= N_Function_Call then
return False;
(Function_Call : Node_Id)
is
Loc : Source_Ptr;
- Func_Call : Node_Id := Function_Call;
+ Func_Call : constant Node_Id := Unqual_Conv (Function_Call);
Function_Id : Entity_Id;
Result_Subt : Entity_Id;
Return_Obj_Id : Entity_Id;
Return_Obj_Decl : Entity_Id;
- Definite : Boolean;
- -- True if result subtype is definite, or has a size that does not
- -- require secondary stack usage (i.e. no variant part or components
- -- whose type depends on discriminants). In particular, untagged types
- -- with only access discriminants do not require secondary stack use.
- -- Note that if the return type is tagged we must always use the sec.
- -- stack because the call may dispatch on result.
-
begin
- -- Step past qualification, type conversion (which can occur in actual
- -- parameter contexts), and unchecked conversion (which can occur in
- -- cases of calls to 'Input).
-
- if Nkind_In (Func_Call, N_Qualified_Expression,
- N_Type_Conversion,
- N_Unchecked_Type_Conversion)
- then
- Func_Call := Expression (Func_Call);
- end if;
-
-- If the call has already been processed to add build-in-place actuals
-- then return. One place this can occur is for calls to build-in-place
-- functions that occur within a call to a protected operation, where
end if;
Result_Subt := Etype (Function_Id);
- Definite :=
- (Is_Definite_Subtype (Underlying_Type (Result_Subt))
- and then not Is_Tagged_Type (Result_Subt))
- or else not Requires_Transient_Scope (Underlying_Type (Result_Subt));
-- If the build-in-place function returns a controlled object, then the
-- object needs to be finalized immediately after the context. Since
-- When the result subtype is definite, an object of the subtype is
-- declared and an access value designating it is passed as an actual.
- elsif Definite then
+ elsif Caller_Known_Size (Func_Call, Result_Subt) then
-- Create a temporary object to hold the function result
Function_Call : Node_Id)
is
Lhs : constant Node_Id := Name (Assign);
- Func_Call : Node_Id := Function_Call;
+ Func_Call : constant Node_Id := Unqual_Conv (Function_Call);
Func_Id : Entity_Id;
Loc : Source_Ptr;
Obj_Decl : Node_Id;
Target : Node_Id;
begin
- -- Step past qualification or unchecked conversion (the latter can occur
- -- in cases of calls to 'Input).
-
- if Nkind_In (Func_Call, N_Qualified_Expression,
- N_Unchecked_Type_Conversion)
- then
- Func_Call := Expression (Func_Call);
- end if;
-
-- If the call has already been processed to add build-in-place actuals
-- then return. This should not normally occur in an assignment context,
-- but we add the protection as a defensive measure.
Caller_Object : Node_Id;
Def_Id : Entity_Id;
Fmaster_Actual : Node_Id := Empty;
- Func_Call : Node_Id := Function_Call;
+ Func_Call : constant Node_Id := Unqual_Conv (Function_Call);
Function_Id : Entity_Id;
Pool_Actual : Node_Id;
Ptr_Typ : Entity_Id;
Res_Decl : Node_Id;
Result_Subt : Entity_Id;
- Definite : Boolean;
- -- True if result subtype is definite, or has a size that does not
- -- require secondary stack usage (i.e. no variant part or components
- -- whose type depends on discriminants). In particular, untagged types
- -- with only access discriminants do not require secondary stack use.
- -- Note that if the return type is tagged we must always use the sec.
- -- stack because the call may dispatch on result.
-
begin
- -- Step past qualification or unchecked conversion (the latter can occur
- -- in cases of calls to 'Input).
-
- if Nkind_In (Func_Call, N_Qualified_Expression,
- N_Unchecked_Type_Conversion)
- then
- Func_Call := Expression (Func_Call);
- end if;
-
-- If the call has already been processed to add build-in-place actuals
-- then return. This should not normally occur in an object declaration,
-- but we add the protection as a defensive measure.
end if;
Result_Subt := Etype (Function_Id);
- Definite :=
- (Is_Definite_Subtype (Underlying_Type (Result_Subt))
- and then not Is_Tagged_Type (Result_Subt))
- or else not Requires_Transient_Scope (Underlying_Type (Result_Subt));
- -- Create an access type designating the function's result subtype. We
- -- use the type of the original call because it may be a call to an
- -- inherited operation, which the expansion has replaced with the parent
- -- operation that yields the parent type. Note that this access type
- -- must be declared before we establish a transient scope, so that it
- -- receives the proper accessibility level.
+ declare
+ Definite : constant Boolean :=
+ Caller_Known_Size (Func_Call, Result_Subt);
+ begin
+ -- Create an access type designating the function's result subtype.
+ -- We use the type of the original call because it may be a call to
+ -- an inherited operation, which the expansion has replaced with the
+ -- parent operation that yields the parent type. Note that this
+ -- access type must be declared before we establish a transient
+ -- scope, so that it receives the proper accessibility level.
+
+ Ptr_Typ := Make_Temporary (Loc, 'A');
+ Ptr_Typ_Decl :=
+ Make_Full_Type_Declaration (Loc,
+ Defining_Identifier => Ptr_Typ,
+ Type_Definition =>
+ Make_Access_To_Object_Definition (Loc,
+ All_Present => True,
+ Subtype_Indication =>
+ New_Occurrence_Of (Etype (Function_Call), Loc)));
+
+ -- The access type and its accompanying object must be inserted after
+ -- the object declaration in the constrained case, so that the
+ -- function call can be passed access to the object. In the
+ -- indefinite case, or if the object declaration is for a return
+ -- object, the access type and object must be inserted before the
+ -- object, since the object declaration is rewritten to be a renaming
+ -- of a dereference of the access object. Note: we need to freeze
+ -- Ptr_Typ explicitly, because the result object is in a different
+ -- (transient) scope, so won't cause freezing.
+
+ if Definite
+ and then not Is_Return_Object (Defining_Identifier (Obj_Decl))
+ then
+ Insert_After_And_Analyze (Obj_Decl, Ptr_Typ_Decl);
+ else
+ Insert_Action (Obj_Decl, Ptr_Typ_Decl);
+ end if;
- Ptr_Typ := Make_Temporary (Loc, 'A');
- Ptr_Typ_Decl :=
- Make_Full_Type_Declaration (Loc,
- Defining_Identifier => Ptr_Typ,
- Type_Definition =>
- Make_Access_To_Object_Definition (Loc,
- All_Present => True,
- Subtype_Indication =>
- New_Occurrence_Of (Etype (Function_Call), Loc)));
-
- -- The access type and its accompanying object must be inserted after
- -- the object declaration in the constrained case, so that the function
- -- call can be passed access to the object. In the indefinite case,
- -- or if the object declaration is for a return object, the access type
- -- and object must be inserted before the object, since the object
- -- declaration is rewritten to be a renaming of a dereference of the
- -- access object. Note: we need to freeze Ptr_Typ explicitly, because
- -- the result object is in a different (transient) scope, so won't
- -- cause freezing.
-
- if Definite
- and then not Is_Return_Object (Defining_Identifier (Obj_Decl))
- then
- Insert_After_And_Analyze (Obj_Decl, Ptr_Typ_Decl);
- else
- Insert_Action (Obj_Decl, Ptr_Typ_Decl);
- end if;
+ -- Force immediate freezing of Ptr_Typ because Res_Decl will be
+ -- elaborated in an inner (transient) scope and thus won't cause
+ -- freezing by itself.
- -- Force immediate freezing of Ptr_Typ because Res_Decl will be
- -- elaborated in an inner (transient) scope and thus won't cause
- -- freezing by itself.
+ declare
+ Ptr_Typ_Freeze_Ref : constant Node_Id :=
+ New_Occurrence_Of (Ptr_Typ, Loc);
+ begin
+ Set_Parent (Ptr_Typ_Freeze_Ref, Ptr_Typ_Decl);
+ Freeze_Expression (Ptr_Typ_Freeze_Ref);
+ end;
- declare
- Ptr_Typ_Freeze_Ref : constant Node_Id :=
- New_Occurrence_Of (Ptr_Typ, Loc);
- begin
- Set_Parent (Ptr_Typ_Freeze_Ref, Ptr_Typ_Decl);
- Freeze_Expression (Ptr_Typ_Freeze_Ref);
- end;
+ -- If the object is a return object of an enclosing build-in-place
+ -- function, then the implicit build-in-place parameters of the
+ -- enclosing function are simply passed along to the called function.
+ -- (Unfortunately, this won't cover the case of extension aggregates
+ -- where the ancestor part is a build-in-place indefinite function
+ -- call that should be passed along the caller's parameters.
+ -- Currently those get mishandled by reassigning the result of the
+ -- call to the aggregate return object, when the call result should
+ -- really be directly built in place in the aggregate and not in a
+ -- temporary. ???)
+
+ if Is_Return_Object (Defining_Identifier (Obj_Decl)) then
+ Pass_Caller_Acc := True;
+
+ -- When the enclosing function has a BIP_Alloc_Form formal then we
+ -- pass it along to the callee (such as when the enclosing
+ -- function has an unconstrained or tagged result type).
+
+ if Needs_BIP_Alloc_Form (Encl_Func) then
+ if RTE_Available (RE_Root_Storage_Pool_Ptr) then
+ Pool_Actual :=
+ New_Occurrence_Of
+ (Build_In_Place_Formal
+ (Encl_Func, BIP_Storage_Pool), Loc);
+
+ -- The build-in-place pool formal is not built on e.g. ZFP
- -- If the object is a return object of an enclosing build-in-place
- -- function, then the implicit build-in-place parameters of the
- -- enclosing function are simply passed along to the called function.
- -- (Unfortunately, this won't cover the case of extension aggregates
- -- where the ancestor part is a build-in-place indefinite function
- -- call that should be passed along the caller's parameters. Currently
- -- those get mishandled by reassigning the result of the call to the
- -- aggregate return object, when the call result should really be
- -- directly built in place in the aggregate and not in a temporary. ???)
-
- if Is_Return_Object (Defining_Identifier (Obj_Decl)) then
- Pass_Caller_Acc := True;
-
- -- When the enclosing function has a BIP_Alloc_Form formal then we
- -- pass it along to the callee (such as when the enclosing function
- -- has an unconstrained or tagged result type).
-
- if Needs_BIP_Alloc_Form (Encl_Func) then
- if RTE_Available (RE_Root_Storage_Pool_Ptr) then
- Pool_Actual :=
- New_Occurrence_Of
- (Build_In_Place_Formal (Encl_Func, BIP_Storage_Pool), Loc);
+ else
+ Pool_Actual := Empty;
+ end if;
+
+ Add_Unconstrained_Actuals_To_Build_In_Place_Call
+ (Function_Call => Func_Call,
+ Function_Id => Function_Id,
+ Alloc_Form_Exp =>
+ New_Occurrence_Of
+ (Build_In_Place_Formal (Encl_Func, BIP_Alloc_Form), Loc),
+ Pool_Actual => Pool_Actual);
- -- The build-in-place pool formal is not built on e.g. ZFP
+ -- Otherwise, if enclosing function has a definite result subtype,
+ -- then caller allocation will be used.
else
- Pool_Actual := Empty;
+ Add_Unconstrained_Actuals_To_Build_In_Place_Call
+ (Func_Call, Function_Id, Alloc_Form => Caller_Allocation);
end if;
- Add_Unconstrained_Actuals_To_Build_In_Place_Call
- (Function_Call => Func_Call,
- Function_Id => Function_Id,
- Alloc_Form_Exp =>
+ if Needs_BIP_Finalization_Master (Encl_Func) then
+ Fmaster_Actual :=
New_Occurrence_Of
- (Build_In_Place_Formal (Encl_Func, BIP_Alloc_Form), Loc),
- Pool_Actual => Pool_Actual);
+ (Build_In_Place_Formal
+ (Encl_Func, BIP_Finalization_Master), Loc);
+ end if;
- -- Otherwise, if enclosing function has a definite result subtype,
- -- then caller allocation will be used.
+ -- Retrieve the BIPacc formal from the enclosing function and
+ -- convert it to the access type of the callee's BIP_Object_Access
+ -- formal.
+
+ Caller_Object :=
+ Make_Unchecked_Type_Conversion (Loc,
+ Subtype_Mark =>
+ New_Occurrence_Of
+ (Etype
+ (Build_In_Place_Formal
+ (Function_Id, BIP_Object_Access)),
+ Loc),
+ Expression =>
+ New_Occurrence_Of
+ (Build_In_Place_Formal (Encl_Func, BIP_Object_Access),
+ Loc));
+
+ -- In the definite case, add an implicit actual to the function call
+ -- that provides access to the declared object. An unchecked
+ -- conversion to the (specific) result type of the function is
+ -- inserted to handle the case where the object is declared with a
+ -- class-wide type.
+
+ elsif Definite then
+ Caller_Object :=
+ Make_Unchecked_Type_Conversion (Loc,
+ Subtype_Mark => New_Occurrence_Of (Result_Subt, Loc),
+ Expression => New_Occurrence_Of (Obj_Def_Id, Loc));
+
+ -- When the function has a controlling result, an allocation-form
+ -- parameter must be passed indicating that the caller is
+ -- allocating the result object. This is needed because such a
+ -- function can be called as a dispatching operation and must be
+ -- treated similarly to functions with indefinite result subtypes.
- else
Add_Unconstrained_Actuals_To_Build_In_Place_Call
(Func_Call, Function_Id, Alloc_Form => Caller_Allocation);
- end if;
-
- if Needs_BIP_Finalization_Master (Encl_Func) then
- Fmaster_Actual :=
- New_Occurrence_Of
- (Build_In_Place_Formal
- (Encl_Func, BIP_Finalization_Master), Loc);
- end if;
-
- -- Retrieve the BIPacc formal from the enclosing function and convert
- -- it to the access type of the callee's BIP_Object_Access formal.
-
- Caller_Object :=
- Make_Unchecked_Type_Conversion (Loc,
- Subtype_Mark =>
- New_Occurrence_Of
- (Etype
- (Build_In_Place_Formal (Function_Id, BIP_Object_Access)),
- Loc),
- Expression =>
- New_Occurrence_Of
- (Build_In_Place_Formal (Encl_Func, BIP_Object_Access),
- Loc));
-
- -- In the definite case, add an implicit actual to the function call
- -- that provides access to the declared object. An unchecked conversion
- -- to the (specific) result type of the function is inserted to handle
- -- the case where the object is declared with a class-wide type.
- elsif Definite then
- Caller_Object :=
- Make_Unchecked_Type_Conversion (Loc,
- Subtype_Mark => New_Occurrence_Of (Result_Subt, Loc),
- Expression => New_Occurrence_Of (Obj_Def_Id, Loc));
+ -- The allocation for indefinite library-level objects occurs on the
+ -- heap as opposed to the secondary stack. This accommodates DLLs
+ -- where the secondary stack is destroyed after each library
+ -- unload. This is a hybrid mechanism where a stack-allocated object
+ -- lives on the heap.
- -- When the function has a controlling result, an allocation-form
- -- parameter must be passed indicating that the caller is allocating
- -- the result object. This is needed because such a function can be
- -- called as a dispatching operation and must be treated similarly
- -- to functions with indefinite result subtypes.
+ elsif Is_Library_Level_Entity (Defining_Identifier (Obj_Decl))
+ and then not Restriction_Active (No_Implicit_Heap_Allocations)
+ then
+ Add_Unconstrained_Actuals_To_Build_In_Place_Call
+ (Func_Call, Function_Id, Alloc_Form => Global_Heap);
+ Caller_Object := Empty;
- Add_Unconstrained_Actuals_To_Build_In_Place_Call
- (Func_Call, Function_Id, Alloc_Form => Caller_Allocation);
+ -- Create a finalization master for the access result type to
+ -- ensure that the heap allocation can properly chain the object
+ -- and later finalize it when the library unit goes out of scope.
- -- The allocation for indefinite library-level objects occurs on the
- -- heap as opposed to the secondary stack. This accommodates DLLs where
- -- the secondary stack is destroyed after each library unload. This is
- -- a hybrid mechanism where a stack-allocated object lives on the heap.
+ if Needs_Finalization (Etype (Func_Call)) then
+ Build_Finalization_Master
+ (Typ => Ptr_Typ,
+ For_Lib_Level => True,
+ Insertion_Node => Ptr_Typ_Decl);
- elsif Is_Library_Level_Entity (Defining_Identifier (Obj_Decl))
- and then not Restriction_Active (No_Implicit_Heap_Allocations)
- then
- Add_Unconstrained_Actuals_To_Build_In_Place_Call
- (Func_Call, Function_Id, Alloc_Form => Global_Heap);
- Caller_Object := Empty;
+ Fmaster_Actual :=
+ Make_Attribute_Reference (Loc,
+ Prefix =>
+ New_Occurrence_Of (Finalization_Master (Ptr_Typ), Loc),
+ Attribute_Name => Name_Unrestricted_Access);
+ end if;
- -- Create a finalization master for the access result type to ensure
- -- that the heap allocation can properly chain the object and later
- -- finalize it when the library unit goes out of scope.
+ -- In other indefinite cases, pass an indication to do the allocation
+ -- on the secondary stack and set Caller_Object to Empty so that a
+ -- null value will be passed for the caller's object address. A
+ -- transient scope is established to ensure eventual cleanup of the
+ -- result.
- if Needs_Finalization (Etype (Func_Call)) then
- Build_Finalization_Master
- (Typ => Ptr_Typ,
- For_Lib_Level => True,
- Insertion_Node => Ptr_Typ_Decl);
+ else
+ Add_Unconstrained_Actuals_To_Build_In_Place_Call
+ (Func_Call, Function_Id, Alloc_Form => Secondary_Stack);
+ Caller_Object := Empty;
- Fmaster_Actual :=
- Make_Attribute_Reference (Loc,
- Prefix =>
- New_Occurrence_Of (Finalization_Master (Ptr_Typ), Loc),
- Attribute_Name => Name_Unrestricted_Access);
+ Establish_Transient_Scope (Obj_Decl, Sec_Stack => True);
end if;
- -- In other indefinite cases, pass an indication to do the allocation
- -- on the secondary stack and set Caller_Object to Empty so that a null
- -- value will be passed for the caller's object address. A transient
- -- scope is established to ensure eventual cleanup of the result.
-
- else
- Add_Unconstrained_Actuals_To_Build_In_Place_Call
- (Func_Call, Function_Id, Alloc_Form => Secondary_Stack);
- Caller_Object := Empty;
+ -- Pass along any finalization master actual, which is needed in the
+ -- case where the called function initializes a return object of an
+ -- enclosing build-in-place function.
- Establish_Transient_Scope (Obj_Decl, Sec_Stack => True);
- end if;
-
- -- Pass along any finalization master actual, which is needed in the
- -- case where the called function initializes a return object of an
- -- enclosing build-in-place function.
-
- Add_Finalization_Master_Actual_To_Build_In_Place_Call
- (Func_Call => Func_Call,
- Func_Id => Function_Id,
- Master_Exp => Fmaster_Actual);
+ Add_Finalization_Master_Actual_To_Build_In_Place_Call
+ (Func_Call => Func_Call,
+ Func_Id => Function_Id,
+ Master_Exp => Fmaster_Actual);
- if Nkind (Parent (Obj_Decl)) = N_Extended_Return_Statement
- and then Has_Task (Result_Subt)
- then
- -- Here we're passing along the master that was passed in to this
- -- function.
+ if Nkind (Parent (Obj_Decl)) = N_Extended_Return_Statement
+ and then Has_Task (Result_Subt)
+ then
+ -- Here we're passing along the master that was passed in to this
+ -- function.
- Add_Task_Actuals_To_Build_In_Place_Call
- (Func_Call, Function_Id,
- Master_Actual =>
- New_Occurrence_Of
- (Build_In_Place_Formal (Encl_Func, BIP_Task_Master), Loc));
+ Add_Task_Actuals_To_Build_In_Place_Call
+ (Func_Call, Function_Id,
+ Master_Actual =>
+ New_Occurrence_Of
+ (Build_In_Place_Formal (Encl_Func, BIP_Task_Master), Loc));
- else
- Add_Task_Actuals_To_Build_In_Place_Call
- (Func_Call, Function_Id, Make_Identifier (Loc, Name_uMaster));
- end if;
+ else
+ Add_Task_Actuals_To_Build_In_Place_Call
+ (Func_Call, Function_Id, Make_Identifier (Loc, Name_uMaster));
+ end if;
- Add_Access_Actual_To_Build_In_Place_Call
- (Func_Call, Function_Id, Caller_Object, Is_Access => Pass_Caller_Acc);
+ Add_Access_Actual_To_Build_In_Place_Call
+ (Func_Call,
+ Function_Id,
+ Caller_Object,
+ Is_Access => Pass_Caller_Acc);
- -- Finally, create an access object initialized to a reference to the
- -- function call. We know this access value cannot be null, so mark the
- -- entity accordingly to suppress the access check.
+ -- Finally, create an access object initialized to a reference to the
+ -- function call. We know this access value cannot be null, so mark
+ -- the entity accordingly to suppress the access check.
- Def_Id := Make_Temporary (Loc, 'R', Func_Call);
- Set_Etype (Def_Id, Ptr_Typ);
- Set_Is_Known_Non_Null (Def_Id);
+ Def_Id := Make_Temporary (Loc, 'R', Func_Call);
+ Set_Etype (Def_Id, Ptr_Typ);
+ Set_Is_Known_Non_Null (Def_Id);
- Res_Decl :=
- Make_Object_Declaration (Loc,
- Defining_Identifier => Def_Id,
- Constant_Present => True,
- Object_Definition => New_Occurrence_Of (Ptr_Typ, Loc),
- Expression =>
- Make_Reference (Loc, Relocate_Node (Func_Call)));
+ Res_Decl :=
+ Make_Object_Declaration (Loc,
+ Defining_Identifier => Def_Id,
+ Constant_Present => True,
+ Object_Definition => New_Occurrence_Of (Ptr_Typ, Loc),
+ Expression =>
+ Make_Reference (Loc, Relocate_Node (Func_Call)));
- Insert_After_And_Analyze (Ptr_Typ_Decl, Res_Decl);
+ Insert_After_And_Analyze (Ptr_Typ_Decl, Res_Decl);
- -- If the result subtype of the called function is definite and is not
- -- itself the return expression of an enclosing BIP function, then mark
- -- the object as having no initialization.
+ -- If the result subtype of the called function is definite and is
+ -- not itself the return expression of an enclosing BIP function,
+ -- then mark the object as having no initialization.
- if Definite
- and then not Is_Return_Object (Defining_Identifier (Obj_Decl))
- then
- -- The related object declaration is encased in a transient block
- -- because the build-in-place function call contains at least one
- -- nested function call that produces a controlled transient
- -- temporary:
+ if Definite
+ and then not Is_Return_Object (Defining_Identifier (Obj_Decl))
+ then
+ -- The related object declaration is encased in a transient block
+ -- because the build-in-place function call contains at least one
+ -- nested function call that produces a controlled transient
+ -- temporary:
- -- Obj : ... := BIP_Func_Call (Ctrl_Func_Call);
+ -- Obj : ... := BIP_Func_Call (Ctrl_Func_Call);
- -- Since the build-in-place expansion decouples the call from the
- -- object declaration, the finalization machinery lacks the context
- -- which prompted the generation of the transient block. To resolve
- -- this scenario, store the build-in-place call.
+ -- Since the build-in-place expansion decouples the call from the
+ -- object declaration, the finalization machinery lacks the
+ -- context which prompted the generation of the transient
+ -- block. To resolve this scenario, store the build-in-place call.
- if Scope_Is_Transient and then Node_To_Be_Wrapped = Obj_Decl then
- Set_BIP_Initialization_Call (Obj_Def_Id, Res_Decl);
- end if;
+ if Scope_Is_Transient and then Node_To_Be_Wrapped = Obj_Decl then
+ Set_BIP_Initialization_Call (Obj_Def_Id, Res_Decl);
+ end if;
- Set_Expression (Obj_Decl, Empty);
- Set_No_Initialization (Obj_Decl);
+ Set_Expression (Obj_Decl, Empty);
+ Set_No_Initialization (Obj_Decl);
- -- In case of an indefinite result subtype, or if the call is the
- -- return expression of an enclosing BIP function, rewrite the object
- -- declaration as an object renaming where the renamed object is a
- -- dereference of <function_Call>'reference:
- --
- -- Obj : Subt renames <function_call>'Ref.all;
+ -- In case of an indefinite result subtype, or if the call is the
+ -- return expression of an enclosing BIP function, rewrite the object
+ -- declaration as an object renaming where the renamed object is a
+ -- dereference of <function_Call>'reference:
+ --
+ -- Obj : Subt renames <function_call>'Ref.all;
- else
- Call_Deref :=
- Make_Explicit_Dereference (Obj_Loc,
- Prefix => New_Occurrence_Of (Def_Id, Obj_Loc));
-
- Rewrite (Obj_Decl,
- Make_Object_Renaming_Declaration (Obj_Loc,
- Defining_Identifier => Make_Temporary (Obj_Loc, 'D'),
- Subtype_Mark => New_Occurrence_Of (Result_Subt, Obj_Loc),
- Name => Call_Deref));
-
- Set_Renamed_Object (Defining_Identifier (Obj_Decl), Call_Deref);
-
- -- If the original entity comes from source, then mark the new
- -- entity as needing debug information, even though it's defined
- -- by a generated renaming that does not come from source, so that
- -- the Materialize_Entity flag will be set on the entity when
- -- Debug_Renaming_Declaration is called during analysis.
-
- if Comes_From_Source (Obj_Def_Id) then
- Set_Debug_Info_Needed (Defining_Identifier (Obj_Decl));
- end if;
+ else
+ Call_Deref :=
+ Make_Explicit_Dereference (Obj_Loc,
+ Prefix => New_Occurrence_Of (Def_Id, Obj_Loc));
+
+ Rewrite (Obj_Decl,
+ Make_Object_Renaming_Declaration (Obj_Loc,
+ Defining_Identifier => Make_Temporary (Obj_Loc, 'D'),
+ Subtype_Mark => New_Occurrence_Of (Result_Subt, Obj_Loc),
+ Name => Call_Deref));
+
+ Set_Renamed_Object (Defining_Identifier (Obj_Decl), Call_Deref);
+
+ -- If the original entity comes from source, then mark the new
+ -- entity as needing debug information, even though it's defined
+ -- by a generated renaming that does not come from source, so that
+ -- the Materialize_Entity flag will be set on the entity when
+ -- Debug_Renaming_Declaration is called during analysis.
+
+ if Comes_From_Source (Obj_Def_Id) then
+ Set_Debug_Info_Needed (Defining_Identifier (Obj_Decl));
+ end if;
- Analyze (Obj_Decl);
+ Analyze (Obj_Decl);
- -- Replace the internal identifier of the renaming declaration's
- -- entity with identifier of the original object entity. We also have
- -- to exchange the entities containing their defining identifiers to
- -- ensure the correct replacement of the object declaration by the
- -- object renaming declaration to avoid homograph conflicts (since
- -- the object declaration's defining identifier was already entered
- -- in current scope). The Next_Entity links of the two entities also
- -- have to be swapped since the entities are part of the return
- -- scope's entity list and the list structure would otherwise be
- -- corrupted. Finally, the homonym chain must be preserved as well.
+ -- Replace the internal identifier of the renaming declaration's
+ -- entity with identifier of the original object entity. We also
+ -- have to exchange the entities containing their defining
+ -- identifiers to ensure the correct replacement of the object
+ -- declaration by the object renaming declaration to avoid
+ -- homograph conflicts (since the object declaration's defining
+ -- identifier was already entered in current scope). The
+ -- Next_Entity links of the two entities also have to be swapped
+ -- since the entities are part of the return scope's entity list
+ -- and the list structure would otherwise be corrupted. Finally,
+ -- the homonym chain must be preserved as well.
- declare
- Ren_Id : constant Entity_Id := Defining_Entity (Obj_Decl);
- Next_Id : constant Entity_Id := Next_Entity (Ren_Id);
+ declare
+ Ren_Id : constant Entity_Id := Defining_Entity (Obj_Decl);
+ Next_Id : constant Entity_Id := Next_Entity (Ren_Id);
- begin
- Set_Chars (Ren_Id, Chars (Obj_Def_Id));
+ begin
+ Set_Chars (Ren_Id, Chars (Obj_Def_Id));
- -- Swap next entity links in preparation for exchanging entities
+ -- Swap next entity links in preparation for exchanging
+ -- entities.
- Set_Next_Entity (Ren_Id, Next_Entity (Obj_Def_Id));
- Set_Next_Entity (Obj_Def_Id, Next_Id);
- Set_Homonym (Ren_Id, Homonym (Obj_Def_Id));
+ Set_Next_Entity (Ren_Id, Next_Entity (Obj_Def_Id));
+ Set_Next_Entity (Obj_Def_Id, Next_Id);
+ Set_Homonym (Ren_Id, Homonym (Obj_Def_Id));
- Exchange_Entities (Ren_Id, Obj_Def_Id);
+ Exchange_Entities (Ren_Id, Obj_Def_Id);
- -- Preserve source indication of original declaration, so that
- -- xref information is properly generated for the right entity.
+ -- Preserve source indication of original declaration, so that
+ -- xref information is properly generated for the right entity.
- Preserve_Comes_From_Source (Obj_Decl, Original_Node (Obj_Decl));
- Preserve_Comes_From_Source (Obj_Def_Id, Original_Node (Obj_Decl));
+ Preserve_Comes_From_Source (Obj_Decl, Original_Node (Obj_Decl));
+ Preserve_Comes_From_Source
+ (Obj_Def_Id, Original_Node (Obj_Decl));
- Set_Comes_From_Source (Ren_Id, False);
- end;
- end if;
+ Set_Comes_From_Source (Ren_Id, False);
+ end;
+ end if;
+ end;
-- If the object entity has a class-wide Etype, then we need to change
-- it to the result subtype of the function call, because otherwise the
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