-- --
-- B o d y --
-- --
--- Copyright (C) 1992-2008, Free Software Foundation, Inc. --
+-- Copyright (C) 1992-2009, 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 Exp_Ch7; use Exp_Ch7;
with Exp_Ch9; use Exp_Ch9;
with Exp_Tss; use Exp_Tss;
+with Fname; use Fname;
with Freeze; use Freeze;
with Itypes; use Itypes;
with Lib; use Lib;
with Rtsfind; use Rtsfind;
with Ttypes; use Ttypes;
with Sem; use Sem;
+with Sem_Aux; use Sem_Aux;
with Sem_Ch3; use Sem_Ch3;
with Sem_Eval; use Sem_Eval;
with Sem_Res; use Sem_Res;
with Sinfo; use Sinfo;
with Snames; use Snames;
with Stand; use Stand;
-with Targparm; use Targparm;
with Tbuild; use Tbuild;
with Uintp; use Uintp;
-- The limit is applied to the total number of components that the
-- aggregate will have, which is the number of static expressions
-- that will appear in the flattened array. This requires a recursive
- -- computation of the the number of scalar components of the structure.
+ -- computation of the number of scalar components of the structure.
---------------------
-- Component_Count --
return True;
end if;
- -- One-component aggregates are suspicious, and if the context
- -- type is an object declaration with non-static bounds it will
- -- trip gcc; such an aggregate must be expanded into a single
- -- assignment.
+ -- One-component aggregates are suspicious, and if the context type
+ -- is an object declaration with non-static bounds it will trip gcc;
+ -- such an aggregate must be expanded into a single assignment.
if Hiv = Lov
and then Nkind (Parent (N)) = N_Object_Declaration
then
declare
Index_Type : constant Entity_Id :=
- Etype
- (First_Index
- (Etype (Defining_Identifier (Parent (N)))));
- Indx : Node_Id;
+ Etype
+ (First_Index
+ (Etype (Defining_Identifier (Parent (N)))));
+ Indx : Node_Id;
+
begin
if not Compile_Time_Known_Value (Type_Low_Bound (Index_Type))
or else not Compile_Time_Known_Value
-- 9. There cannot be any discriminated record components, since the
-- back end cannot handle this complex case.
+ -- 10. No controlled actions need to be generated for components
+
function Backend_Processing_Possible (N : Node_Id) return Boolean is
Typ : constant Entity_Id := Etype (N);
-- Typ is the correct constrained array subtype of the aggregate
-- Start of processing for Backend_Processing_Possible
begin
- -- Checks 2 (array must not be bit packed)
+ -- Checks 2 (array not bit packed) and 10 (no controlled actions)
- if Is_Bit_Packed_Array (Typ) then
+ if Is_Bit_Packed_Array (Typ) or else Needs_Finalization (Typ) then
return False;
end if;
-- with tagged components, but not clear whether it's worthwhile ???;
-- in the case of the JVM, object tags are handled implicitly)
- if Is_Tagged_Type (Component_Type (Typ)) and then VM_Target = No_VM then
+ if Is_Tagged_Type (Component_Type (Typ))
+ and then Tagged_Type_Expansion
+ then
return False;
end if;
if Present (Flist) then
F := New_Copy_Tree (Flist);
- elsif Present (Etype (N)) and then Controlled_Type (Etype (N)) then
+ elsif Present (Etype (N)) and then Needs_Finalization (Etype (N)) then
if Is_Entity_Name (Into)
and then Present (Scope (Entity (Into)))
then
-- default initialized components (otherwise Expr_Q is not present).
if Present (Expr_Q)
- and then (Nkind (Expr_Q) = N_Aggregate
- or else Nkind (Expr_Q) = N_Extension_Aggregate)
+ and then Nkind_In (Expr_Q, N_Aggregate, N_Extension_Aggregate)
then
- -- At this stage the Expression may not have been
- -- analyzed yet because the array aggregate code has not
- -- been updated to use the Expansion_Delayed flag and
- -- avoid analysis altogether to solve the same problem
- -- (see Resolve_Aggr_Expr). So let us do the analysis of
- -- non-array aggregates now in order to get the value of
- -- Expansion_Delayed flag for the inner aggregate ???
+ -- At this stage the Expression may not have been analyzed yet
+ -- because the array aggregate code has not been updated to use
+ -- the Expansion_Delayed flag and avoid analysis altogether to
+ -- solve the same problem (see Resolve_Aggr_Expr). So let us do
+ -- the analysis of non-array aggregates now in order to get the
+ -- value of Expansion_Delayed flag for the inner aggregate ???
if Present (Comp_Type) and then not Is_Array_Type (Comp_Type) then
Analyze_And_Resolve (Expr_Q, Comp_Type);
Expression => Make_Null (Loc)));
end if;
- if Controlled_Type (Ctype) then
+ if Needs_Finalization (Ctype) then
Append_List_To (L,
Make_Init_Call (
Ref => New_Copy_Tree (Indexed_Comp),
Name => Indexed_Comp,
Expression => New_Copy_Tree (Expr));
- if Present (Comp_Type) and then Controlled_Type (Comp_Type) then
+ if Present (Comp_Type) and then Needs_Finalization (Comp_Type) then
Set_No_Ctrl_Actions (A);
-- If this is an aggregate for an array of arrays, each
Append_To (L, A);
-- Adjust the tag if tagged (because of possible view
- -- conversions), unless compiling for the Java VM where
+ -- conversions), unless compiling for a VM where
-- tags are implicit.
if Present (Comp_Type)
and then Is_Tagged_Type (Comp_Type)
- and then VM_Target = No_VM
+ and then Tagged_Type_Expansion
then
A :=
Make_OK_Assignment_Statement (Loc,
-- inner finalization actions).
if Present (Comp_Type)
- and then Controlled_Type (Comp_Type)
+ and then Needs_Finalization (Comp_Type)
and then not Is_Limited_Type (Comp_Type)
- and then
- (not Is_Array_Type (Comp_Type)
- or else not Is_Controlled (Component_Type (Comp_Type))
- or else Nkind (Expr) /= N_Aggregate)
+ and then not
+ (Is_Array_Type (Comp_Type)
+ and then Is_Controlled (Component_Type (Comp_Type))
+ and then Nkind (Expr) = N_Aggregate)
then
Append_List_To (L,
Make_Adjust_Call (
Parent_Typ := Etype (Current_Typ);
while Current_Typ /= Parent_Typ loop
- if Has_Discriminants (Parent_Typ) then
+ if Has_Discriminants (Parent_Typ)
+ and then not Has_Unknown_Discriminants (Parent_Typ)
+ then
Parent_Disc := First_Discriminant (Parent_Typ);
-- We either get the association from the subtype indication
-- proper scope is the scope of the target rather than the
-- potentially transient current scope.
- if Controlled_Type (Typ) then
+ if Needs_Finalization (Typ) then
-- The current aggregate belongs to an allocator which creates
-- an object through an anonymous access type or acts as the root
end if;
end Gen_Ctrl_Actions_For_Aggr;
+ function Rewrite_Discriminant (Expr : Node_Id) return Traverse_Result;
+ -- If default expression of a component mentions a discriminant of the
+ -- type, it must be rewritten as the discriminant of the target object.
+
function Replace_Type (Expr : Node_Id) return Traverse_Result;
-- If the aggregate contains a self-reference, traverse each expression
-- to replace a possible self-reference with a reference to the proper
-- component of the target of the assignment.
+ --------------------------
+ -- Rewrite_Discriminant --
+ --------------------------
+
+ function Rewrite_Discriminant (Expr : Node_Id) return Traverse_Result is
+ begin
+ if Nkind (Expr) = N_Identifier
+ and then Present (Entity (Expr))
+ and then Ekind (Entity (Expr)) = E_In_Parameter
+ and then Present (Discriminal_Link (Entity (Expr)))
+ then
+ Rewrite (Expr,
+ Make_Selected_Component (Loc,
+ Prefix => New_Occurrence_Of (Obj, Loc),
+ Selector_Name => Make_Identifier (Loc, Chars (Expr))));
+ end if;
+ return OK;
+ end Rewrite_Discriminant;
+
------------------
-- Replace_Type --
------------------
procedure Replace_Self_Reference is
new Traverse_Proc (Replace_Type);
+ procedure Replace_Discriminants is
+ new Traverse_Proc (Rewrite_Discriminant);
+
-- Start of processing for Build_Record_Aggr_Code
begin
-- are visible. We know already that the types are compatible.
if Present (Etype (Lhs))
- and then Is_Interface (Etype (Lhs))
+ and then Is_Class_Wide_Type (Etype (Lhs))
then
Target := Unchecked_Convert_To (Typ, Lhs);
else
Ref := Convert_To (Init_Typ, New_Copy_Tree (Target));
Set_Assignment_OK (Ref);
- if Has_Default_Init_Comps (N)
- or else Has_Task (Base_Type (Init_Typ))
- then
- Append_List_To (L,
- Build_Initialization_Call (Loc,
- Id_Ref => Ref,
- Typ => Init_Typ,
- In_Init_Proc => Within_Init_Proc,
- With_Default_Init => True));
- else
- Append_List_To (L,
- Build_Initialization_Call (Loc,
- Id_Ref => Ref,
- Typ => Init_Typ,
- In_Init_Proc => Within_Init_Proc));
- end if;
+ Append_List_To (L,
+ Build_Initialization_Call (Loc,
+ Id_Ref => Ref,
+ Typ => Init_Typ,
+ In_Init_Proc => Within_Init_Proc,
+ With_Default_Init => Has_Default_Init_Comps (N)
+ or else
+ Has_Task (Base_Type (Init_Typ))));
if Is_Constrained (Entity (A))
and then Has_Discriminants (Entity (A))
Check_Ancestor_Discriminants (Entity (A));
end if;
+ -- Handle calls to C++ constructors
+
+ elsif Is_CPP_Constructor_Call (A) then
+ Init_Typ := Etype (A);
+ Ref := Convert_To (Init_Typ, New_Copy_Tree (Target));
+ Set_Assignment_OK (Ref);
+
+ Append_List_To (L,
+ Build_Initialization_Call (Loc,
+ Id_Ref => Ref,
+ Typ => Init_Typ,
+ In_Init_Proc => Within_Init_Proc,
+ With_Default_Init => Has_Default_Init_Comps (N),
+ Constructor_Ref => A));
+
-- Ada 2005 (AI-287): If the ancestor part is an aggregate of
-- limited type, a recursive call expands the ancestor. Note that
-- in the limited case, the ancestor part must be either a
-- function call (possibly qualified, or wrapped in an unchecked
-- conversion) or aggregate (definitely qualified).
+ -- The ancestor part can also be a function call (that may be
+ -- transformed into an explicit dereference) or a qualification
+ -- of one such.
elsif Is_Limited_Type (Etype (A))
- and then Nkind (Unqualify (A)) /= N_Function_Call -- aggregate?
- and then
- (Nkind (Unqualify (A)) /= N_Unchecked_Type_Conversion
- or else
- Nkind (Expression (Unqualify (A))) /= N_Function_Call)
+ and then Nkind_In (Unqualify (A), N_Aggregate,
+ N_Extension_Aggregate)
then
Ancestor_Is_Expression := True;
-- If the ancestor part is an aggregate, force its full
-- expansion, which was delayed.
- if Nkind (Unqualify (A)) = N_Aggregate
- or else Nkind (Unqualify (A)) = N_Extension_Aggregate
+ if Nkind_In (Unqualify (A), N_Aggregate,
+ N_Extension_Aggregate)
then
Set_Analyzed (A, False);
Set_Analyzed (Expression (A), False);
-- the subsequent deep_adjust works properly (unless VM_Target,
-- where tags are implicit).
- if VM_Target = No_VM then
+ if Tagged_Type_Expansion then
Instr :=
Make_OK_Assignment_Statement (Loc,
Name =>
-- Call Adjust manually
- if Controlled_Type (Etype (A))
+ if Needs_Finalization (Etype (A))
and then not Is_Limited_Type (Etype (A))
then
Append_List_To (Assign,
end if;
end if;
+ -- For CPP types we generate an implicit call to the C++ default
+ -- constructor to ensure the proper initialization of the _Tag
+ -- component.
+
+ if Is_CPP_Class (Typ) then
+ pragma Assert (Present (Base_Init_Proc (Typ)));
+ Append_List_To (L,
+ Build_Initialization_Call (Loc,
+ Id_Ref => Lhs,
+ Typ => Typ));
+ end if;
+
-- Generate the assignments, component by component
-- tmp.comp1 := Expr1_From_Aggr;
while Present (Comp) loop
Selector := Entity (First (Choices (Comp)));
+ -- C++ constructors
+
+ if Is_CPP_Constructor_Call (Expression (Comp)) then
+ Append_List_To (L,
+ Build_Initialization_Call (Loc,
+ Id_Ref => Make_Selected_Component (Loc,
+ Prefix => New_Copy_Tree (Target),
+ Selector_Name => New_Occurrence_Of (Selector,
+ Loc)),
+ Typ => Etype (Selector),
+ Enclos_Type => Typ,
+ With_Default_Init => True,
+ Constructor_Ref => Expression (Comp)));
+
-- Ada 2005 (AI-287): For each default-initialized component generate
-- a call to the corresponding IP subprogram if available.
- if Box_Present (Comp)
+ elsif Box_Present (Comp)
and then Has_Non_Null_Base_Init_Proc (Etype (Selector))
then
if Ekind (Selector) /= E_Discriminant then
Enclos_Type => Typ,
With_Default_Init => True));
- goto Next_Comp;
- end if;
-
-- Prepare for component assignment
- if Ekind (Selector) /= E_Discriminant
+ elsif Ekind (Selector) /= E_Discriminant
or else Nkind (N) = N_Extension_Aggregate
then
-- All the discriminants have now been assigned
-- The controller is the one of the parent type defining the
-- component (in case of inherited components).
- if Controlled_Type (Comp_Type) then
+ if Needs_Finalization (Comp_Type) then
Internal_Final_List :=
Make_Selected_Component (Loc,
Prefix => Convert_To (
-- Expr_Q is not delayed aggregate
else
+ if Has_Discriminants (Typ) then
+ Replace_Discriminants (Expr_Q);
+ end if;
+
Instr :=
Make_OK_Assignment_Statement (Loc,
Name => Comp_Expr,
- Expression => Expression (Comp));
+ Expression => Expr_Q);
Set_No_Ctrl_Actions (Instr);
Append_To (L, Instr);
-- tmp.comp._tag := comp_typ'tag;
- if Is_Tagged_Type (Comp_Type) and then VM_Target = No_VM then
+ if Is_Tagged_Type (Comp_Type)
+ and then Tagged_Type_Expansion
+ then
Instr :=
Make_OK_Assignment_Statement (Loc,
Name =>
-- Attach_To_Final_List (tmp.comp,
-- comp_typ (tmp)._record_controller.f)
- if Controlled_Type (Comp_Type)
+ if Needs_Finalization (Comp_Type)
and then not Is_Limited_Type (Comp_Type)
then
Append_List_To (L,
end;
end if;
- <<Next_Comp>>
-
Next (Comp);
end loop;
if Ancestor_Is_Expression then
null;
- elsif Is_Tagged_Type (Typ) and then VM_Target = No_VM then
+ -- For CPP types we generated a call to the C++ default constructor
+ -- before the components have been initialized to ensure the proper
+ -- initialization of the _Tag component (see above).
+
+ elsif Is_CPP_Class (Typ) then
+ null;
+
+ elsif Is_Tagged_Type (Typ) and then Tagged_Type_Expansion then
Instr :=
Make_OK_Assignment_Statement (Loc,
Name =>
procedure Convert_To_Assignments (N : Node_Id; Typ : Entity_Id) is
Loc : constant Source_Ptr := Sloc (N);
+ T : Entity_Id;
Temp : Entity_Id;
Instr : Node_Id;
(Is_Inherently_Limited_Type (Typ)
and then
(Nkind (Parent (Parent_Node)) = N_Extended_Return_Statement
- or else Nkind (Parent_Node) = N_Simple_Return_Statement))
+ or else Nkind (Parent_Node) = N_Simple_Return_Statement))
then
Set_Expansion_Delayed (N);
return;
Is_Controlled (Typ) or else Has_Controlled_Component (Typ));
end if;
- -- If the aggregate is non-limited, create a temporary. If it is
- -- limited and the context is an assignment, this is a subaggregate
- -- for an enclosing aggregate being expanded. It must be built in place,
- -- so use the target of the current assignment.
+ -- If the aggregate is non-limited, create a temporary. If it is limited
+ -- and the context is an assignment, this is a subaggregate for an
+ -- enclosing aggregate being expanded. It must be built in place, so use
+ -- the target of the current assignment.
if Is_Limited_Type (Typ)
and then Nkind (Parent (N)) = N_Assignment_Statement
else
Temp := Make_Defining_Identifier (Loc, New_Internal_Name ('A'));
+ -- If the type inherits unknown discriminants, use the view with
+ -- known discriminants if available.
+
+ if Has_Unknown_Discriminants (Typ)
+ and then Present (Underlying_Record_View (Typ))
+ then
+ T := Underlying_Record_View (Typ);
+ else
+ T := Typ;
+ end if;
+
Instr :=
Make_Object_Declaration (Loc,
Defining_Identifier => Temp,
- Object_Definition => New_Occurrence_Of (Typ, Loc));
+ Object_Definition => New_Occurrence_Of (T, Loc));
Set_No_Initialization (Instr);
Insert_Action (N, Instr);
- Initialize_Discriminants (Instr, Typ);
+ Initialize_Discriminants (Instr, T);
Target_Expr := New_Occurrence_Of (Temp, Loc);
- Insert_Actions (N, Build_Record_Aggr_Code (N, Typ, Target_Expr));
+ Insert_Actions (N, Build_Record_Aggr_Code (N, T, Target_Expr));
Rewrite (N, New_Occurrence_Of (Temp, Loc));
- Analyze_And_Resolve (N, Typ);
+ Analyze_And_Resolve (N, T);
end if;
end Convert_To_Assignments;
if Nkind (Elmt) = N_Aggregate
and then Present (Next_Index (Ix))
and then
- not Flatten (Elmt, Next_Index (Ix), Next_Index (Ixb))
+ not Flatten (Elmt, Next_Index (Ix), Next_Index (Ixb))
then
return False;
end if;
-- Check for maximum others replication. Note that
-- we skip this test if either of the restrictions
-- No_Elaboration_Code or No_Implicit_Loops is
- -- active, or if this is a preelaborable unit.
+ -- active, if this is a preelaborable unit or a
+ -- predefined unit. This ensures that predefined
+ -- units get the same level of constant folding in
+ -- Ada 95 and Ada 05, where their categorization
+ -- has changed.
declare
P : constant Entity_Id :=
Cunit_Entity (Current_Sem_Unit);
begin
+ -- Check if duplication OK and if so continue
+ -- processing.
+
if Restriction_Active (No_Elaboration_Code)
or else Restriction_Active (No_Implicit_Loops)
or else Is_Preelaborated (P)
or else (Ekind (P) = E_Package_Body
and then
Is_Preelaborated (Spec_Entity (P)))
+ or else
+ Is_Predefined_File_Name
+ (Unit_File_Name (Get_Source_Unit (P)))
then
null;
+ -- If duplication not OK, then we return False
+ -- if the replication count is too high
+
elsif Rep_Count > Max_Others_Replicate then
return False;
+
+ -- Continue on if duplication not OK, but the
+ -- replication count is not excessive.
+
+ else
+ null;
end if;
end;
end if;
-- STEP 3
- -- Delay expansion for nested aggregates it will be taken care of
- -- when the parent aggregate is expanded
+ -- Delay expansion for nested aggregates: it will be taken care of
+ -- when the parent aggregate is expanded.
Parent_Node := Parent (N);
Parent_Kind := Nkind (Parent_Node);
or else Parent_Kind = N_Extension_Aggregate
or else Parent_Kind = N_Component_Association
or else (Parent_Kind = N_Object_Declaration
- and then Controlled_Type (Typ))
+ and then Needs_Finalization (Typ))
or else (Parent_Kind = N_Assignment_Statement
and then Inside_Init_Proc)
then
else
Maybe_In_Place_OK :=
(Nkind (Parent (N)) = N_Assignment_Statement
- and then Comes_From_Source (N)
- and then In_Place_Assign_OK)
+ and then Comes_From_Source (N)
+ and then In_Place_Assign_OK)
or else
(Nkind (Parent (Parent (N))) = N_Allocator
and then In_Place_Assign_OK);
end if;
- -- If this is an array of tasks, it will be expanded into build-in-
- -- -place assignments. Build an activation chain for the tasks now
+ -- If this is an array of tasks, it will be expanded into build-in-place
+ -- assignments. Build an activation chain for the tasks now.
if Has_Task (Etype (N)) then
Build_Activation_Chain_Entity (N);
Set_No_Initialization (Tmp_Decl, True);
-- If we are within a loop, the temporary will be pushed on the
- -- stack at each iteration. If the aggregate is the expression for
- -- an allocator, it will be immediately copied to the heap and can
+ -- stack at each iteration. If the aggregate is the expression for an
+ -- allocator, it will be immediately copied to the heap and can
-- be reclaimed at once. We create a transient scope around the
-- aggregate for this purpose.
Insert_Action (N, Tmp_Decl);
end if;
- -- Construct and insert the aggregate code. We can safely suppress
- -- index checks because this code is guaranteed not to raise CE
- -- on index checks. However we should *not* suppress all checks.
+ -- Construct and insert the aggregate code. We can safely suppress index
+ -- checks because this code is guaranteed not to raise CE on index
+ -- checks. However we should *not* suppress all checks.
declare
Target : Node_Id;
else
Set_Etype (N, Typ);
- if VM_Target = No_VM then
+ if Tagged_Type_Expansion then
Expand_Record_Aggregate (N,
Orig_Tag =>
New_Occurrence_Of
or else (Is_Entity_Name (Expr_Q)
and then
Ekind (Entity (Expr_Q)) in Formal_Kind))
- and then VM_Target = No_VM
+ and then Tagged_Type_Expansion
then
Static_Components := False;
return True;
-- an atomic move for it.
if Is_Atomic (Typ)
- and then (Nkind (Parent (N)) = N_Object_Declaration
- or else Nkind (Parent (N)) = N_Assignment_Statement)
and then Comes_From_Source (Parent (N))
+ and then Is_Atomic_Aggregate (N, Typ)
then
- Expand_Atomic_Aggregate (N, Typ);
return;
-- No special management required for aggregates used to initialize
if Present (Orig_Tag) then
Tag_Value := Orig_Tag;
- elsif VM_Target /= No_VM then
+ elsif not Tagged_Type_Expansion then
Tag_Value := Empty;
else
Tag_Value :=
-- For a root type, the tag component is added (unless compiling
-- for the VMs, where tags are implicit).
- elsif VM_Target = No_VM then
+ elsif Tagged_Type_Expansion then
declare
Tag_Name : constant Node_Id :=
New_Occurrence_Of
C : Node_Id;
Expr : Node_Id;
begin
- pragma Assert (Nkind (N) = N_Aggregate
- or else Nkind (N) = N_Extension_Aggregate);
+ pragma Assert (Nkind_In (N, N_Aggregate, N_Extension_Aggregate));
if No (Comps) then
return False;
Expr := Expression (C);
if Present (Expr)
- and then (Nkind (Expr) = N_Aggregate
- or else Nkind (Expr) = N_Extension_Aggregate)
+ and then
+ Nkind_In (Expr, N_Aggregate, N_Extension_Aggregate)
and then Has_Default_Init_Comps (Expr)
then
return True;
begin
return Static_Dispatch_Tables
- and then VM_Target = No_VM
+ and then Tagged_Type_Expansion
and then RTU_Loaded (Ada_Tags)
-- Avoid circularity when rebuilding the compiler
return False;
else
- -- The aggregate is static if all components are literals, or
- -- else all its components are static aggregates for the
+ -- The aggregate is static if all components are literals,
+ -- or else all its components are static aggregates for the
-- component type. We also limit the size of a static aggregate
-- to prevent runaway static expressions.
loop
Append_To
(Expressions (Agg), New_Copy (Expression (Expr)));
- Set_Etype (Last (Expressions (Agg)), Component_Type (Typ));
+
+ -- The copied expression must be analyzed and resolved.
+ -- Besides setting the type, this ensures that static
+ -- expressions are appropriately marked as such.
+
+ Analyze_And_Resolve
+ (Last (Expressions (Agg)), Component_Type (Typ));
end loop;
Set_Aggregate_Bounds (Agg, Bounds);
return False;
end if;
end Static_Array_Aggregate;
+
end Exp_Aggr;
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