-- --
-- 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;
function Backend_Processing_Possible (N : Node_Id) return Boolean;
-- This function checks if array aggregate N can be processed directly
- -- by Gigi. If this is the case True is returned.
+ -- by the backend. If this is the case True is returned.
function Build_Array_Aggr_Code
(N : Node_Id;
-- 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.
+ -- 10. No controlled actions need to be generated for components
+
+ -- 11. For a VM back end, the array should have no aliased components
function Backend_Processing_Possible (N : Node_Id) return Boolean is
Typ : constant Entity_Id := Etype (N);
-- 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;
return False;
end if;
+ -- Checks 11: Array aggregates with aliased components are currently
+ -- not well supported by the VM backend; disable temporarily this
+ -- backend processing until it is definitely supported.
+
+ if VM_Target /= No_VM
+ and then Has_Aliased_Components (Base_Type (Typ))
+ then
+ return False;
+ end if;
+
-- Backend processing is possible
Set_Size_Known_At_Compile_Time (Etype (N), True);
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,
function Gen_Loop (L, H : Node_Id; Expr : Node_Id) return List_Id is
L_J : Node_Id;
+ L_L : Node_Id;
+ -- Index_Base'(L)
+
+ L_H : Node_Id;
+ -- Index_Base'(H)
+
L_Range : Node_Id;
-- Index_Base'(L) .. Index_Base'(H)
L_J := Make_Defining_Identifier (Loc, New_Internal_Name ('J'));
- -- Construct "L .. H"
+ -- Construct "L .. H" in Index_Base. We use a qualified expression
+ -- for the bound to convert to the index base, but we don't need
+ -- to do that if we already have the base type at hand.
+
+ if Etype (L) = Index_Base then
+ L_L := L;
+ else
+ L_L :=
+ Make_Qualified_Expression (Loc,
+ Subtype_Mark => Index_Base_Name,
+ Expression => L);
+ end if;
+
+ if Etype (H) = Index_Base then
+ L_H := H;
+ else
+ L_H :=
+ Make_Qualified_Expression (Loc,
+ Subtype_Mark => Index_Base_Name,
+ Expression => H);
+ end if;
L_Range :=
- Make_Range
- (Loc,
- Low_Bound => Make_Qualified_Expression
- (Loc,
- Subtype_Mark => Index_Base_Name,
- Expression => L),
- High_Bound => Make_Qualified_Expression
- (Loc,
- Subtype_Mark => Index_Base_Name,
- Expression => H));
+ Make_Range (Loc,
+ Low_Bound => L_L,
+ High_Bound => L_H);
-- Construct "for L_J in Index_Base range L .. H"
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
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
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
+ if not Is_Interface (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));
+ 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))
+ then
+ Check_Ancestor_Discriminants (Entity (A));
+ end if;
end if;
- if Is_Constrained (Entity (A))
- and then Has_Discriminants (Entity (A))
- then
- 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
-- 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 =>
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
declare
SubE : constant Entity_Id :=
Make_Defining_Identifier (Loc,
- New_Internal_Name ('T'));
+ Chars => New_Internal_Name ('T'));
SubD : constant Node_Id :=
Make_Subtype_Declaration (Loc,
- Defining_Identifier =>
- SubE,
+ Defining_Identifier => SubE,
Subtype_Indication =>
Make_Subtype_Indication (Loc,
- Subtype_Mark => New_Reference_To (
- Etype (Comp_Type), Loc),
+ Subtype_Mark =>
+ New_Reference_To
+ (Etype (Comp_Type), Loc),
Constraint =>
- Make_Index_Or_Discriminant_Constraint (
- Loc, Constraints => New_List (
- New_Copy_Tree (Aggregate_Bounds (
- Expr_Q))))));
+ Make_Index_Or_Discriminant_Constraint
+ (Loc,
+ Constraints => New_List (
+ New_Copy_Tree
+ (Aggregate_Bounds (Expr_Q))))));
-- Create a temporary array of the above subtype which
-- will be used to capture the aggregate assignments.
- TmpE : constant Entity_Id :=
- Make_Defining_Identifier (Loc,
- New_Internal_Name ('A'));
+ TmpE : constant Entity_Id := Make_Temporary (Loc, 'A', N);
TmpD : constant Node_Id :=
Make_Object_Declaration (Loc,
- Defining_Identifier =>
- TmpE,
+ Defining_Identifier => TmpE,
Object_Definition =>
New_Reference_To (SubE, Loc));
-- 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 =>
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 =>
N_Discriminant_Specification
then
Flist := Empty;
- else
+
+ elsif Needs_Finalization (Typ) then
Flist := Find_Final_List (Access_Type);
+
+ -- Otherwise there are no controlled actions to be performed.
+
+ else
+ Flist := Empty;
end if;
if Is_Array_Type (Typ) then
Rewrite (Parent (N), Make_Null_Statement (Loc));
else
- Temp := Make_Defining_Identifier (Loc, New_Internal_Name ('A'));
+ Temp := Make_Temporary (Loc, 'A', N);
-- If the type inherits unknown discriminants, use the view with
-- known discriminants if available.
-- total number of components is safe enough to expand.
function Is_Flat (N : Node_Id; Dims : Int) return Boolean;
- -- Return True iff the array N is flat (which is not rivial in the case
+ -- Return True iff the array N is flat (which is not trivial in the case
-- of multidimensionsl aggregates).
-----------------------------
-- 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;
end if;
end if;
- -- Range cases merge with Lo,Hi said
+ -- Range cases merge with Lo,Hi set
if not Compile_Time_Known_Value (Lo)
or else
end if;
Aggr_In := First_Index (Etype (N));
+
if Nkind (Parent (N)) = N_Assignment_Statement then
Obj_In := First_Index (Etype (Name (Parent (N))));
-- STEP 4
- -- Look if in place aggregate expansion is possible.
+ -- Look if in place aggregate expansion is possible
-- For object declarations we build the aggregate in place, unless
-- the array is bit-packed or the component is controlled.
else
Maybe_In_Place_OK := False;
- Tmp := Make_Defining_Identifier (Loc, New_Internal_Name ('A'));
+ Tmp := Make_Temporary (Loc, 'A', N);
Tmp_Decl :=
Make_Object_Declaration
(Loc,
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_In (Parent (N), N_Object_Declaration,
- 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
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
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