-- --
-- B o d y --
-- --
--- Copyright (C) 1992-2004, 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- --
--- ware Foundation; either version 2, or (at your option) any later ver- --
+-- ware Foundation; either version 3, or (at your option) any later ver- --
-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
-- for more details. You should have received a copy of the GNU General --
--- Public License distributed with GNAT; see file COPYING. If not, write --
--- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
--- MA 02111-1307, USA. --
+-- Public License distributed with GNAT; see file COPYING3. If not, go to --
+-- http://www.gnu.org/licenses for a complete copy of the license. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
with Elists; use Elists;
with Errout; use Errout;
with Exp_Aggr; use Exp_Aggr;
+with Exp_Atag; use Exp_Atag;
with Exp_Ch3; use Exp_Ch3;
+with Exp_Ch6; use Exp_Ch6;
with Exp_Ch7; use Exp_Ch7;
with Exp_Ch9; use Exp_Ch9;
with Exp_Disp; use Exp_Disp;
with Exp_Tss; use Exp_Tss;
with Exp_Util; use Exp_Util;
with Exp_VFpt; use Exp_VFpt;
-with Hostparm; use Hostparm;
+with Freeze; use Freeze;
with Inline; use Inline;
+with Namet; use Namet;
with Nlists; use Nlists;
with Nmake; use Nmake;
with Opt; use Opt;
+with Restrict; use Restrict;
+with Rident; use Rident;
with Rtsfind; use Rtsfind;
with Sem; use Sem;
with Sem_Cat; use Sem_Cat;
with Sem_Ch3; use Sem_Ch3;
+with Sem_Ch8; use Sem_Ch8;
with Sem_Ch13; use Sem_Ch13;
with Sem_Eval; use Sem_Eval;
with Sem_Res; use Sem_Res;
(N : Node_Id;
Op1 : Node_Id;
Op2 : Node_Id);
- -- If an boolean array assignment can be done in place, build call to
+ -- If a boolean array assignment can be done in place, build call to
-- corresponding library procedure.
+ procedure Displace_Allocator_Pointer (N : Node_Id);
+ -- Ada 2005 (AI-251): Subsidiary procedure to Expand_N_Allocator and
+ -- Expand_Allocator_Expression. Allocating class-wide interface objects
+ -- this routine displaces the pointer to the allocated object to reference
+ -- the component referencing the corresponding secondary dispatch table.
+
procedure Expand_Allocator_Expression (N : Node_Id);
-- Subsidiary to Expand_N_Allocator, for the case when the expression
-- is a qualified expression or an aggregate.
-- Local recursive function used to expand equality for nested
-- composite types. Used by Expand_Record/Array_Equality, Bodies
-- is a list on which to attach bodies of local functions that are
- -- created in the process. This is the responsability of the caller
+ -- created in the process. This is the responsibility of the caller
-- to insert those bodies at the right place. Nod provides the Sloc
-- value for generated code. Lhs and Rhs are the left and right sides
-- for the comparison, and Typ is the type of the arrays to compare.
procedure Expand_Concatenate_String (Cnode : Node_Id; Opnds : List_Id);
-- Routine to expand concatenation of 2-5 operands (in the list Operands)
- -- and replace node Cnode with the result of the contatenation. If there
+ -- and replace node Cnode with the result of the concatenation. If there
-- are two operands, they can be string or character. If there are more
-- than two operands, then are always of type string (i.e. the caller has
-- already converted character operands to strings in this case).
-- this by using Convert_To_Actual_Subtype if necessary).
procedure Rewrite_Comparison (N : Node_Id);
- -- N is the node for a compile time comparison. If this outcome of this
- -- comparison can be determined at compile time, then the node N can be
- -- rewritten with True or False. If the outcome cannot be determined at
- -- compile time, the call has no effect.
+ -- If N is the node for a comparison whose outcome can be determined at
+ -- compile time, then the node N can be rewritten with True or False. If
+ -- the outcome cannot be determined at compile time, the call has no
+ -- effect. If N is a type conversion, then this processing is applied to
+ -- its expression. If N is neither comparison nor a type conversion, the
+ -- call has no effect.
function Tagged_Membership (N : Node_Id) return Node_Id;
-- Construct the expression corresponding to the tagged membership test.
if Kind = N_Op_Not then
if Nkind (Op1) in N_Binary_Op then
- -- Use negated version of the binary operators.
+ -- Use negated version of the binary operators
if Nkind (Op1) = N_Op_And then
Proc_Name := RTE (RE_Vector_Nand);
return;
end Build_Boolean_Array_Proc_Call;
+ --------------------------------
+ -- Displace_Allocator_Pointer --
+ --------------------------------
+
+ procedure Displace_Allocator_Pointer (N : Node_Id) is
+ Loc : constant Source_Ptr := Sloc (N);
+ Orig_Node : constant Node_Id := Original_Node (N);
+ Dtyp : Entity_Id;
+ Etyp : Entity_Id;
+ PtrT : Entity_Id;
+
+ begin
+ -- Do nothing in case of VM targets: the virtual machine will handle
+ -- interfaces directly.
+
+ if VM_Target /= No_VM then
+ return;
+ end if;
+
+ pragma Assert (Nkind (N) = N_Identifier
+ and then Nkind (Orig_Node) = N_Allocator);
+
+ PtrT := Etype (Orig_Node);
+ Dtyp := Designated_Type (PtrT);
+ Etyp := Etype (Expression (Orig_Node));
+
+ if Is_Class_Wide_Type (Dtyp)
+ and then Is_Interface (Dtyp)
+ then
+ -- If the type of the allocator expression is not an interface type
+ -- we can generate code to reference the record component containing
+ -- the pointer to the secondary dispatch table.
+
+ if not Is_Interface (Etyp) then
+ declare
+ Saved_Typ : constant Entity_Id := Etype (Orig_Node);
+
+ begin
+ -- 1) Get access to the allocated object
+
+ Rewrite (N,
+ Make_Explicit_Dereference (Loc,
+ Relocate_Node (N)));
+ Set_Etype (N, Etyp);
+ Set_Analyzed (N);
+
+ -- 2) Add the conversion to displace the pointer to reference
+ -- the secondary dispatch table.
+
+ Rewrite (N, Convert_To (Dtyp, Relocate_Node (N)));
+ Analyze_And_Resolve (N, Dtyp);
+
+ -- 3) The 'access to the secondary dispatch table will be used
+ -- as the value returned by the allocator.
+
+ Rewrite (N,
+ Make_Attribute_Reference (Loc,
+ Prefix => Relocate_Node (N),
+ Attribute_Name => Name_Access));
+ Set_Etype (N, Saved_Typ);
+ Set_Analyzed (N);
+ end;
+
+ -- If the type of the allocator expression is an interface type we
+ -- generate a run-time call to displace "this" to reference the
+ -- component containing the pointer to the secondary dispatch table
+ -- or else raise Constraint_Error if the actual object does not
+ -- implement the target interface. This case corresponds with the
+ -- following example:
+
+ -- function Op (Obj : Iface_1'Class) return access Iface_2'Class is
+ -- begin
+ -- return new Iface_2'Class'(Obj);
+ -- end Op;
+
+ else
+ Rewrite (N,
+ Unchecked_Convert_To (PtrT,
+ Make_Function_Call (Loc,
+ Name => New_Reference_To (RTE (RE_Displace), Loc),
+ Parameter_Associations => New_List (
+ Unchecked_Convert_To (RTE (RE_Address),
+ Relocate_Node (N)),
+
+ New_Occurrence_Of
+ (Elists.Node
+ (First_Elmt
+ (Access_Disp_Table (Etype (Base_Type (Dtyp))))),
+ Loc)))));
+ Analyze_And_Resolve (N, PtrT);
+ end if;
+ end if;
+ end Displace_Allocator_Pointer;
+
---------------------------------
-- Expand_Allocator_Expression --
---------------------------------
procedure Expand_Allocator_Expression (N : Node_Id) is
- Loc : constant Source_Ptr := Sloc (N);
- Exp : constant Node_Id := Expression (Expression (N));
- Indic : constant Node_Id := Subtype_Mark (Expression (N));
- PtrT : constant Entity_Id := Etype (N);
- T : constant Entity_Id := Entity (Indic);
+ Loc : constant Source_Ptr := Sloc (N);
+ Exp : constant Node_Id := Expression (Expression (N));
+ PtrT : constant Entity_Id := Etype (N);
+ DesigT : constant Entity_Id := Designated_Type (PtrT);
+
+ procedure Apply_Accessibility_Check
+ (Ref : Node_Id;
+ Built_In_Place : Boolean := False);
+ -- Ada 2005 (AI-344): For an allocator with a class-wide designated
+ -- type, generate an accessibility check to verify that the level of
+ -- the type of the created object is not deeper than the level of the
+ -- access type. If the type of the qualified expression is class-
+ -- wide, then always generate the check (except in the case where it
+ -- is known to be unnecessary, see comment below). Otherwise, only
+ -- generate the check if the level of the qualified expression type
+ -- is statically deeper than the access type. Although the static
+ -- accessibility will generally have been performed as a legality
+ -- check, it won't have been done in cases where the allocator
+ -- appears in generic body, so a run-time check is needed in general.
+ -- One special case is when the access type is declared in the same
+ -- scope as the class-wide allocator, in which case the check can
+ -- never fail, so it need not be generated. As an open issue, there
+ -- seem to be cases where the static level associated with the
+ -- class-wide object's underlying type is not sufficient to perform
+ -- the proper accessibility check, such as for allocators in nested
+ -- subprograms or accept statements initialized by class-wide formals
+ -- when the actual originates outside at a deeper static level. The
+ -- nested subprogram case might require passing accessibility levels
+ -- along with class-wide parameters, and the task case seems to be
+ -- an actual gap in the language rules that needs to be fixed by the
+ -- ARG. ???
+
+ -------------------------------
+ -- Apply_Accessibility_Check --
+ -------------------------------
+
+ procedure Apply_Accessibility_Check
+ (Ref : Node_Id;
+ Built_In_Place : Boolean := False)
+ is
+ Ref_Node : Node_Id;
+
+ begin
+ -- Note: we skip the accessibility check for the VM case, since
+ -- there does not seem to be any practical way of implementing it.
+
+ if Ada_Version >= Ada_05
+ and then VM_Target = No_VM
+ and then Is_Class_Wide_Type (DesigT)
+ and then not Scope_Suppress (Accessibility_Check)
+ and then
+ (Type_Access_Level (Etype (Exp)) > Type_Access_Level (PtrT)
+ or else
+ (Is_Class_Wide_Type (Etype (Exp))
+ and then Scope (PtrT) /= Current_Scope))
+ then
+ -- If the allocator was built in place Ref is already a reference
+ -- to the access object initialized to the result of the allocator
+ -- (see Exp_Ch6.Make_Build_In_Place_Call_In_Allocator). Otherwise
+ -- it is the entity associated with the object containing the
+ -- address of the allocated object.
+
+ if Built_In_Place then
+ Ref_Node := New_Copy (Ref);
+ else
+ Ref_Node := New_Reference_To (Ref, Loc);
+ end if;
+
+ Insert_Action (N,
+ Make_Raise_Program_Error (Loc,
+ Condition =>
+ Make_Op_Gt (Loc,
+ Left_Opnd =>
+ Build_Get_Access_Level (Loc,
+ Make_Attribute_Reference (Loc,
+ Prefix => Ref_Node,
+ Attribute_Name => Name_Tag)),
+ Right_Opnd =>
+ Make_Integer_Literal (Loc,
+ Type_Access_Level (PtrT))),
+ Reason => PE_Accessibility_Check_Failed));
+ end if;
+ end Apply_Accessibility_Check;
+
+ -- Local variables
+
+ Indic : constant Node_Id := Subtype_Mark (Expression (N));
+ T : constant Entity_Id := Entity (Indic);
Flist : Node_Id;
Node : Node_Id;
Temp : Entity_Id;
+ TagT : Entity_Id := Empty;
+ -- Type used as source for tag assignment
+
+ TagR : Node_Id := Empty;
+ -- Target reference for tag assignment
+
Aggr_In_Place : constant Boolean := Is_Delayed_Aggregate (Exp);
Tag_Assign : Node_Id;
Tmp_Node : Node_Id;
+ -- Start of processing for Expand_Allocator_Expression
+
begin
if Is_Tagged_Type (T) or else Controlled_Type (T) then
+ -- Ada 2005 (AI-318-02): If the initialization expression is a
+ -- call to a build-in-place function, then access to the allocated
+ -- object must be passed to the function. Currently we limit such
+ -- functions to those with constrained limited result subtypes,
+ -- but eventually we plan to expand the allowed forms of functions
+ -- that are treated as build-in-place.
+
+ if Ada_Version >= Ada_05
+ and then Is_Build_In_Place_Function_Call (Exp)
+ then
+ Make_Build_In_Place_Call_In_Allocator (N, Exp);
+ Apply_Accessibility_Check (N, Built_In_Place => True);
+ return;
+ end if;
+
-- Actions inserted before:
-- Temp : constant ptr_T := new T'(Expression);
-- <no CW> Temp._tag := T'tag;
-- We analyze by hand the new internal allocator to avoid
-- any recursion and inappropriate call to Initialize
+ -- We don't want to remove side effects when the expression must be
+ -- built in place. In the case of a build-in-place function call,
+ -- that could lead to a duplication of the call, which was already
+ -- substituted for the allocator.
+
if not Aggr_In_Place then
Remove_Side_Effects (Exp);
end if;
if Is_Class_Wide_Type (T) then
Expand_Subtype_From_Expr (Empty, T, Indic, Exp);
- Set_Expression (Expression (N),
- Unchecked_Convert_To (Entity (Indic), Exp));
+ -- Ada 2005 (AI-251): If the expression is a class-wide interface
+ -- object we generate code to move up "this" to reference the
+ -- base of the object before allocating the new object.
+
+ -- Note that Exp'Address is recursively expanded into a call
+ -- to Base_Address (Exp.Tag)
+
+ if Is_Class_Wide_Type (Etype (Exp))
+ and then Is_Interface (Etype (Exp))
+ and then VM_Target = No_VM
+ then
+ Set_Expression
+ (Expression (N),
+ Unchecked_Convert_To (Entity (Indic),
+ Make_Explicit_Dereference (Loc,
+ Unchecked_Convert_To (RTE (RE_Tag_Ptr),
+ Make_Attribute_Reference (Loc,
+ Prefix => Exp,
+ Attribute_Name => Name_Address)))));
+
+ else
+ Set_Expression
+ (Expression (N),
+ Unchecked_Convert_To (Entity (Indic), Exp));
+ end if;
Analyze_And_Resolve (Expression (N), Entity (Indic));
end if;
- if Aggr_In_Place then
- Tmp_Node :=
- Make_Object_Declaration (Loc,
- Defining_Identifier => Temp,
- Object_Definition => New_Reference_To (PtrT, Loc),
- Expression =>
- Make_Allocator (Loc,
- New_Reference_To (Etype (Exp), Loc)));
+ -- Keep separate the management of allocators returning interfaces
+
+ if not Is_Interface (Directly_Designated_Type (PtrT)) then
+ if Aggr_In_Place then
+ Tmp_Node :=
+ Make_Object_Declaration (Loc,
+ Defining_Identifier => Temp,
+ Object_Definition => New_Reference_To (PtrT, Loc),
+ Expression =>
+ Make_Allocator (Loc,
+ New_Reference_To (Etype (Exp), Loc)));
- Set_Comes_From_Source
- (Expression (Tmp_Node), Comes_From_Source (N));
+ Set_Comes_From_Source
+ (Expression (Tmp_Node), Comes_From_Source (N));
- Set_No_Initialization (Expression (Tmp_Node));
- Insert_Action (N, Tmp_Node);
+ Set_No_Initialization (Expression (Tmp_Node));
+ Insert_Action (N, Tmp_Node);
- if Controlled_Type (T)
- and then Ekind (PtrT) = E_Anonymous_Access_Type
- then
- -- Create local finalization list for access parameter.
+ if Controlled_Type (T)
+ and then Ekind (PtrT) = E_Anonymous_Access_Type
+ then
+ -- Create local finalization list for access parameter
- Flist := Get_Allocator_Final_List (N, Base_Type (T), PtrT);
+ Flist := Get_Allocator_Final_List (N, Base_Type (T), PtrT);
+ end if;
+
+ Convert_Aggr_In_Allocator (N, Tmp_Node, Exp);
+ else
+ Node := Relocate_Node (N);
+ Set_Analyzed (Node);
+ Insert_Action (N,
+ Make_Object_Declaration (Loc,
+ Defining_Identifier => Temp,
+ Constant_Present => True,
+ Object_Definition => New_Reference_To (PtrT, Loc),
+ Expression => Node));
end if;
- Convert_Aggr_In_Allocator (Tmp_Node, Exp);
+ -- Ada 2005 (AI-251): Handle allocators whose designated type is an
+ -- interface type. In this case we use the type of the qualified
+ -- expression to allocate the object.
+
else
- Node := Relocate_Node (N);
- Set_Analyzed (Node);
- Insert_Action (N,
- Make_Object_Declaration (Loc,
- Defining_Identifier => Temp,
- Constant_Present => True,
- Object_Definition => New_Reference_To (PtrT, Loc),
- Expression => Node));
+ declare
+ Def_Id : constant Entity_Id :=
+ Make_Defining_Identifier (Loc,
+ New_Internal_Name ('T'));
+ New_Decl : Node_Id;
+
+ begin
+ New_Decl :=
+ Make_Full_Type_Declaration (Loc,
+ Defining_Identifier => Def_Id,
+ Type_Definition =>
+ Make_Access_To_Object_Definition (Loc,
+ All_Present => True,
+ Null_Exclusion_Present => False,
+ Constant_Present => False,
+ Subtype_Indication =>
+ New_Reference_To (Etype (Exp), Loc)));
+
+ Insert_Action (N, New_Decl);
+
+ -- Inherit the final chain to ensure that the expansion of the
+ -- aggregate is correct in case of controlled types
+
+ if Controlled_Type (Directly_Designated_Type (PtrT)) then
+ Set_Associated_Final_Chain (Def_Id,
+ Associated_Final_Chain (PtrT));
+ end if;
+
+ -- Declare the object using the previous type declaration
+
+ if Aggr_In_Place then
+ Tmp_Node :=
+ Make_Object_Declaration (Loc,
+ Defining_Identifier => Temp,
+ Object_Definition => New_Reference_To (Def_Id, Loc),
+ Expression =>
+ Make_Allocator (Loc,
+ New_Reference_To (Etype (Exp), Loc)));
+
+ Set_Comes_From_Source
+ (Expression (Tmp_Node), Comes_From_Source (N));
+
+ Set_No_Initialization (Expression (Tmp_Node));
+ Insert_Action (N, Tmp_Node);
+
+ if Controlled_Type (T)
+ and then Ekind (PtrT) = E_Anonymous_Access_Type
+ then
+ -- Create local finalization list for access parameter
+
+ Flist :=
+ Get_Allocator_Final_List (N, Base_Type (T), PtrT);
+ end if;
+
+ Convert_Aggr_In_Allocator (N, Tmp_Node, Exp);
+ else
+ Node := Relocate_Node (N);
+ Set_Analyzed (Node);
+ Insert_Action (N,
+ Make_Object_Declaration (Loc,
+ Defining_Identifier => Temp,
+ Constant_Present => True,
+ Object_Definition => New_Reference_To (Def_Id, Loc),
+ Expression => Node));
+ end if;
+
+ -- Generate an additional object containing the address of the
+ -- returned object. The type of this second object declaration
+ -- is the correct type required for the common processing
+ -- that is still performed by this subprogram. The displacement
+ -- of this pointer to reference the component associated with
+ -- the interface type will be done at the end of the common
+ -- processing.
+
+ New_Decl :=
+ Make_Object_Declaration (Loc,
+ Defining_Identifier => Make_Defining_Identifier (Loc,
+ New_Internal_Name ('P')),
+ Object_Definition => New_Reference_To (PtrT, Loc),
+ Expression => Unchecked_Convert_To (PtrT,
+ New_Reference_To (Temp, Loc)));
+
+ Insert_Action (N, New_Decl);
+
+ Tmp_Node := New_Decl;
+ Temp := Defining_Identifier (New_Decl);
+ end;
end if;
- -- Suppress the tag assignment when Java_VM because JVM tags
- -- are represented implicitly in objects.
+ Apply_Accessibility_Check (Temp);
+
+ -- Generate the tag assignment
- if Is_Tagged_Type (T)
- and then not Is_Class_Wide_Type (T)
- and then not Java_VM
+ -- Suppress the tag assignment when VM_Target because VM tags are
+ -- represented implicitly in objects.
+
+ if VM_Target /= No_VM then
+ null;
+
+ -- Ada 2005 (AI-251): Suppress the tag assignment with class-wide
+ -- interface objects because in this case the tag does not change.
+
+ elsif Is_Interface (Directly_Designated_Type (Etype (N))) then
+ pragma Assert (Is_Class_Wide_Type
+ (Directly_Designated_Type (Etype (N))));
+ null;
+
+ elsif Is_Tagged_Type (T) and then not Is_Class_Wide_Type (T) then
+ TagT := T;
+ TagR := New_Reference_To (Temp, Loc);
+
+ elsif Is_Private_Type (T)
+ and then Is_Tagged_Type (Underlying_Type (T))
then
+ TagT := Underlying_Type (T);
+ TagR :=
+ Unchecked_Convert_To (Underlying_Type (T),
+ Make_Explicit_Dereference (Loc,
+ Prefix => New_Reference_To (Temp, Loc)));
+ end if;
+
+ if Present (TagT) then
Tag_Assign :=
Make_Assignment_Statement (Loc,
Name =>
Make_Selected_Component (Loc,
- Prefix => New_Reference_To (Temp, Loc),
+ Prefix => TagR,
Selector_Name =>
- New_Reference_To (Tag_Component (T), Loc)),
+ New_Reference_To (First_Tag_Component (TagT), Loc)),
Expression =>
Unchecked_Convert_To (RTE (RE_Tag),
- New_Reference_To (Access_Disp_Table (T), Loc)));
+ New_Reference_To
+ (Elists.Node (First_Elmt (Access_Disp_Table (TagT))),
+ Loc)));
-- The previous assignment has to be done in any case
Set_Assignment_OK (Name (Tag_Assign));
Insert_Action (N, Tag_Assign);
-
- elsif Is_Private_Type (T)
- and then Is_Tagged_Type (Underlying_Type (T))
- and then not Java_VM
- then
- declare
- Utyp : constant Entity_Id := Underlying_Type (T);
- Ref : constant Node_Id :=
- Unchecked_Convert_To (Utyp,
- Make_Explicit_Dereference (Loc,
- New_Reference_To (Temp, Loc)));
-
- begin
- Tag_Assign :=
- Make_Assignment_Statement (Loc,
- Name =>
- Make_Selected_Component (Loc,
- Prefix => Ref,
- Selector_Name =>
- New_Reference_To (Tag_Component (Utyp), Loc)),
-
- Expression =>
- Unchecked_Convert_To (RTE (RE_Tag),
- New_Reference_To (
- Access_Disp_Table (Utyp), Loc)));
-
- Set_Assignment_OK (Name (Tag_Assign));
- Insert_Action (N, Tag_Assign);
- end;
end if;
- if Controlled_Type (Designated_Type (PtrT))
+ if Controlled_Type (DesigT)
and then Controlled_Type (T)
then
declare
if Controlled_Type (T)
and then Ekind (PtrT) = E_Anonymous_Access_Type
then
- -- Create local finalization list for access parameter.
+ -- Create local finalization list for access parameter
Flist :=
Get_Allocator_Final_List (N, Base_Type (T), PtrT);
Attach := Make_Integer_Literal (Loc, 2);
end if;
- if not Aggr_In_Place then
+ -- Generate an Adjust call if the object will be moved. In Ada
+ -- 2005, the object may be inherently limited, in which case
+ -- there is no Adjust procedure, and the object is built in
+ -- place. In Ada 95, the object can be limited but not
+ -- inherently limited if this allocator came from a return
+ -- statement (we're allocating the result on the secondary
+ -- stack). In that case, the object will be moved, so we _do_
+ -- want to Adjust.
+
+ if not Aggr_In_Place
+ and then not Is_Inherently_Limited_Type (T)
+ then
Insert_Actions (N,
Make_Adjust_Call (
Ref =>
Unchecked_Convert_To (T,
Make_Explicit_Dereference (Loc,
- New_Reference_To (Temp, Loc))),
+ Prefix => New_Reference_To (Temp, Loc))),
Typ => T,
Flist_Ref => Flist,
- With_Attach => Attach));
+ With_Attach => Attach,
+ Allocator => True));
end if;
end;
end if;
Rewrite (N, New_Reference_To (Temp, Loc));
Analyze_And_Resolve (N, PtrT);
+ -- Ada 2005 (AI-251): Displace the pointer to reference the
+ -- record component containing the secondary dispatch table
+ -- of the interface type.
+
+ if Is_Interface (Directly_Designated_Type (PtrT)) then
+ Displace_Allocator_Pointer (N);
+ end if;
+
elsif Aggr_In_Place then
Temp :=
Make_Defining_Identifier (Loc, New_Internal_Name ('P'));
Set_No_Initialization (Expression (Tmp_Node));
Insert_Action (N, Tmp_Node);
- Convert_Aggr_In_Allocator (Tmp_Node, Exp);
+ Convert_Aggr_In_Allocator (N, Tmp_Node, Exp);
Rewrite (N, New_Reference_To (Temp, Loc));
Analyze_And_Resolve (N, PtrT);
- elsif Is_Access_Type (Designated_Type (PtrT))
+ elsif Is_Access_Type (DesigT)
and then Nkind (Exp) = N_Allocator
and then Nkind (Expression (Exp)) /= N_Qualified_Expression
then
-- Apply constraint to designated subtype indication
Apply_Constraint_Check (Expression (Exp),
- Designated_Type (Designated_Type (PtrT)),
+ Designated_Type (DesigT),
No_Sliding => True);
if Nkind (Expression (Exp)) = N_Raise_Constraint_Error then
-- on the qualified expression does not allow sliding,
-- but this check does (a relaxation from Ada 83).
- if Is_Constrained (Designated_Type (PtrT))
+ if Is_Constrained (DesigT)
and then not Subtypes_Statically_Match
- (T, Designated_Type (PtrT))
+ (T, DesigT)
then
Apply_Constraint_Check
- (Exp, Designated_Type (PtrT), No_Sliding => False);
+ (Exp, DesigT, No_Sliding => False);
-- The nonsliding check should really be performed
-- (unconditionally) against the subtype of the
else
Apply_Constraint_Check
- (Exp, Designated_Type (PtrT), No_Sliding => True);
+ (Exp, DesigT, No_Sliding => True);
+ end if;
+
+ -- For an access to unconstrained packed array, GIGI needs
+ -- to see an expression with a constrained subtype in order
+ -- to compute the proper size for the allocator.
+
+ if Is_Array_Type (T)
+ and then not Is_Constrained (T)
+ and then Is_Packed (T)
+ then
+ declare
+ ConstrT : constant Entity_Id :=
+ Make_Defining_Identifier (Loc,
+ Chars => New_Internal_Name ('A'));
+ Internal_Exp : constant Node_Id := Relocate_Node (Exp);
+ begin
+ Insert_Action (Exp,
+ Make_Subtype_Declaration (Loc,
+ Defining_Identifier => ConstrT,
+ Subtype_Indication =>
+ Make_Subtype_From_Expr (Exp, T)));
+ Freeze_Itype (ConstrT, Exp);
+ Rewrite (Exp, OK_Convert_To (ConstrT, Internal_Exp));
+ end;
+ end if;
+
+ -- Ada 2005 (AI-318-02): If the initialization expression is a
+ -- call to a build-in-place function, then access to the allocated
+ -- object must be passed to the function. Currently we limit such
+ -- functions to those with constrained limited result subtypes,
+ -- but eventually we plan to expand the allowed forms of functions
+ -- that are treated as build-in-place.
+
+ if Ada_Version >= Ada_05
+ and then Is_Build_In_Place_Function_Call (Exp)
+ then
+ Make_Build_In_Place_Call_In_Allocator (N, Exp);
end if;
end if;
begin
-- Deal first with unpacked case, where we can call a runtime routine
-- except that we avoid this for targets for which are not addressable
- -- by bytes, and for the JVM, since the JVM does not support direct
+ -- by bytes, and for the JVM/CIL, since they do not support direct
-- addressing of array components.
if not Is_Bit_Packed_Array (Typ1)
and then Byte_Addressable
- and then not Java_VM
+ and then VM_Target = No_VM
then
-- The call we generate is:
(Arr : Entity_Id;
Nam : Name_Id;
Num : Int) return Node_Id;
- -- This builds the attribute reference Arr'Nam (Expr).
+ -- This builds the attribute reference Arr'Nam (Expr)
function Component_Equality (Typ : Entity_Id) return Node_Id;
-- Create one statement to compare corresponding components,
Test := Expand_Composite_Equality
(Nod, Component_Type (Typ), L, R, Decls);
- return
- Make_Implicit_If_Statement (Nod,
- Condition => Make_Op_Not (Loc, Right_Opnd => Test),
- Then_Statements => New_List (
- Make_Return_Statement (Loc,
- Expression => New_Occurrence_Of (Standard_False, Loc))));
+ -- If some (sub)component is an unchecked_union, the whole operation
+ -- will raise program error.
+
+ if Nkind (Test) = N_Raise_Program_Error then
+
+ -- This node is going to be inserted at a location where a
+ -- statement is expected: clear its Etype so analysis will
+ -- set it to the expected Standard_Void_Type.
+
+ Set_Etype (Test, Empty);
+ return Test;
+
+ else
+ return
+ Make_Implicit_If_Statement (Nod,
+ Condition => Make_Op_Not (Loc, Right_Opnd => Test),
+ Then_Statements => New_List (
+ Make_Simple_Return_Statement (Loc,
+ Expression => New_Occurrence_Of (Standard_False, Loc))));
+ end if;
end Component_Equality;
------------------
Handle_One_Dimension (N + 1, Next_Index (Index)));
if Need_Separate_Indexes then
- -- Generate guard for loop, followed by increments of indices.
+
+ -- Generate guard for loop, followed by increments of indices
Append_To (Stm_List,
Make_Exit_Statement (Loc,
Expressions => New_List (New_Reference_To (Bn, Loc)))));
end if;
- -- If separate indexes, we need a declare block for An and Bn,
- -- and a loop without an iteration scheme.
+ -- If separate indexes, we need a declare block for An and Bn, and a
+ -- loop without an iteration scheme.
if Need_Separate_Indexes then
Loop_Stm :=
Make_Function_Specification (Loc,
Defining_Unit_Name => Func_Name,
Parameter_Specifications => Formals,
- Subtype_Mark => New_Reference_To (Standard_Boolean, Loc)),
+ Result_Definition => New_Reference_To (Standard_Boolean, Loc)),
Declarations => Decls,
Make_Implicit_If_Statement (Nod,
Condition => Test_Empty_Arrays,
Then_Statements => New_List (
- Make_Return_Statement (Loc,
+ Make_Simple_Return_Statement (Loc,
Expression =>
New_Occurrence_Of (Standard_True, Loc)))),
Make_Implicit_If_Statement (Nod,
Condition => Test_Lengths_Correspond,
Then_Statements => New_List (
- Make_Return_Statement (Loc,
+ Make_Simple_Return_Statement (Loc,
Expression =>
New_Occurrence_Of (Standard_False, Loc)))),
Handle_One_Dimension (1, First_Index (Ltyp)),
- Make_Return_Statement (Loc,
+ Make_Simple_Return_Statement (Loc,
Expression => New_Occurrence_Of (Standard_True, Loc)))));
Set_Has_Completion (Func_Name, True);
Typ : constant Entity_Id := Etype (N);
begin
- if Is_Bit_Packed_Array (Typ) then
+ -- Special case of bit packed array where both operands are known
+ -- to be properly aligned. In this case we use an efficient run time
+ -- routine to carry out the operation (see System.Bit_Ops).
+
+ if Is_Bit_Packed_Array (Typ)
+ and then not Is_Possibly_Unaligned_Object (Left_Opnd (N))
+ and then not Is_Possibly_Unaligned_Object (Right_Opnd (N))
+ then
Expand_Packed_Boolean_Operator (N);
+ return;
+ end if;
- else
- -- For the normal non-packed case, the general expansion is
- -- to build a function for carrying out the comparison (using
- -- Make_Boolean_Array_Op) and then inserting it into the tree.
- -- The original operator node is then rewritten as a call to
- -- this function.
+ -- For the normal non-packed case, the general expansion is to build
+ -- function for carrying out the comparison (use Make_Boolean_Array_Op)
+ -- and then inserting it into the tree. The original operator node is
+ -- then rewritten as a call to this function. We also use this in the
+ -- packed case if either operand is a possibly unaligned object.
- declare
- Loc : constant Source_Ptr := Sloc (N);
- L : constant Node_Id := Relocate_Node (Left_Opnd (N));
- R : constant Node_Id := Relocate_Node (Right_Opnd (N));
- Func_Body : Node_Id;
- Func_Name : Entity_Id;
+ declare
+ Loc : constant Source_Ptr := Sloc (N);
+ L : constant Node_Id := Relocate_Node (Left_Opnd (N));
+ R : constant Node_Id := Relocate_Node (Right_Opnd (N));
+ Func_Body : Node_Id;
+ Func_Name : Entity_Id;
- begin
- Convert_To_Actual_Subtype (L);
- Convert_To_Actual_Subtype (R);
- Ensure_Defined (Etype (L), N);
- Ensure_Defined (Etype (R), N);
- Apply_Length_Check (R, Etype (L));
-
- if Nkind (Parent (N)) = N_Assignment_Statement
- and then Safe_In_Place_Array_Op (Name (Parent (N)), L, R)
- then
- Build_Boolean_Array_Proc_Call (Parent (N), L, R);
+ begin
+ Convert_To_Actual_Subtype (L);
+ Convert_To_Actual_Subtype (R);
+ Ensure_Defined (Etype (L), N);
+ Ensure_Defined (Etype (R), N);
+ Apply_Length_Check (R, Etype (L));
+
+ if Nkind (N) = N_Op_Xor then
+ Silly_Boolean_Array_Xor_Test (N, Etype (L));
+ end if;
- elsif Nkind (Parent (N)) = N_Op_Not
- and then Nkind (N) = N_Op_And
- and then
- Safe_In_Place_Array_Op (Name (Parent (Parent (N))), L, R)
- then
- return;
- else
+ if Nkind (Parent (N)) = N_Assignment_Statement
+ and then Safe_In_Place_Array_Op (Name (Parent (N)), L, R)
+ then
+ Build_Boolean_Array_Proc_Call (Parent (N), L, R);
+
+ elsif Nkind (Parent (N)) = N_Op_Not
+ and then Nkind (N) = N_Op_And
+ and then
+ Safe_In_Place_Array_Op (Name (Parent (Parent (N))), L, R)
+ then
+ return;
+ else
- Func_Body := Make_Boolean_Array_Op (Etype (L), N);
- Func_Name := Defining_Unit_Name (Specification (Func_Body));
- Insert_Action (N, Func_Body);
+ Func_Body := Make_Boolean_Array_Op (Etype (L), N);
+ Func_Name := Defining_Unit_Name (Specification (Func_Body));
+ Insert_Action (N, Func_Body);
- -- Now rewrite the expression with a call
+ -- Now rewrite the expression with a call
- Rewrite (N,
- Make_Function_Call (Loc,
- Name => New_Reference_To (Func_Name, Loc),
- Parameter_Associations =>
- New_List
- (L, Make_Type_Conversion
- (Loc, New_Reference_To (Etype (L), Loc), R))));
+ Rewrite (N,
+ Make_Function_Call (Loc,
+ Name => New_Reference_To (Func_Name, Loc),
+ Parameter_Associations =>
+ New_List (
+ L,
+ Make_Type_Conversion
+ (Loc, New_Reference_To (Etype (L), Loc), R))));
- Analyze_And_Resolve (N, Typ);
- end if;
- end;
- end if;
+ Analyze_And_Resolve (N, Typ);
+ end if;
+ end;
end Expand_Boolean_Operator;
-------------------------------
-- It is not possible to infer the discriminant since
-- the subtype is not constrained.
- Insert_Action (Nod,
+ return
Make_Raise_Program_Error (Loc,
- Reason => PE_Unchecked_Union_Restriction));
-
- -- Prevent Gigi from generating illegal code, change
- -- the equality to a standard False.
-
- return New_Occurrence_Of (Standard_False, Loc);
+ Reason => PE_Unchecked_Union_Restriction);
end if;
-- Rhs of the composite equality
end if;
else
- Insert_Action (Nod,
+ return
Make_Raise_Program_Error (Loc,
- Reason => PE_Unchecked_Union_Restriction));
-
- return Empty;
+ Reason => PE_Unchecked_Union_Restriction);
end if;
-- Call the TSS equality function with the inferred
-- Let n be the number of array operands to be concatenated, Base_Typ
-- their base type, Ind_Typ their index type, and Arr_Typ the original
- -- array type to which the concatenantion operator applies, then the
+ -- array type to which the concatenation operator applies, then the
-- following subprogram is constructed:
-- [function Cnn (S1 : Base_Typ; ...; Sn : Base_Typ) return Base_Typ is
-- L := Si'First; otherwise (where I is the input param given)
function H return Node_Id;
- -- Builds reference to identifier H.
+ -- Builds reference to identifier H
function Ind_Val (E : Node_Id) return Node_Id;
-- Builds expression Ind_Typ'Val (E);
function L return Node_Id;
- -- Builds reference to identifier L.
+ -- Builds reference to identifier L
function L_Pos return Node_Id;
- -- Builds expression Integer_Type'(Ind_Typ'Pos (L)).
- -- We qualify the expression to avoid universal_integer computations
- -- whenever possible, in the expression for the upper bound H.
+ -- Builds expression Integer_Type'(Ind_Typ'Pos (L)). We qualify the
+ -- expression to avoid universal_integer computations whenever possible,
+ -- in the expression for the upper bound H.
function L_Succ return Node_Id;
- -- Builds expression Ind_Typ'Succ (L).
+ -- Builds expression Ind_Typ'Succ (L)
function One return Node_Id;
- -- Builds integer literal one.
+ -- Builds integer literal one
function P return Node_Id;
- -- Builds reference to identifier P.
+ -- Builds reference to identifier P
function P_Succ return Node_Id;
- -- Builds expression Ind_Typ'Succ (P).
+ -- Builds expression Ind_Typ'Succ (P)
function R return Node_Id;
- -- Builds reference to identifier R.
+ -- Builds reference to identifier R
function S (I : Nat) return Node_Id;
- -- Builds reference to identifier Si, where I is the value given.
+ -- Builds reference to identifier Si, where I is the value given
function S_First (I : Nat) return Node_Id;
- -- Builds expression Si'First, where I is the value given.
+ -- Builds expression Si'First, where I is the value given
function S_Last (I : Nat) return Node_Id;
- -- Builds expression Si'Last, where I is the value given.
+ -- Builds expression Si'Last, where I is the value given
function S_Length (I : Nat) return Node_Id;
- -- Builds expression Si'Length, where I is the value given.
+ -- Builds expression Si'Length, where I is the value given
function S_Length_Test (I : Nat) return Node_Id;
- -- Builds expression Si'Length /= 0, where I is the value given.
+ -- Builds expression Si'Length /= 0, where I is the value given
-------------------
-- Copy_Into_R_S --
Make_Function_Specification (Loc,
Defining_Unit_Name => Func_Id,
Parameter_Specifications => Param_Specs,
- Subtype_Mark => New_Reference_To (Base_Typ, Loc));
+ Result_Definition => New_Reference_To (Base_Typ, Loc));
-- Construct L's object declaration
Condition => S_Length_Test (1),
Then_Statements => New_List (Init_L (1)),
Elsif_Parts => Elsif_List,
- Else_Statements => New_List (Make_Return_Statement (Loc,
+ Else_Statements => New_List (Make_Simple_Return_Statement (Loc,
Expression => S (Nb_Opnds))));
-- Construct the declaration for H
Then_Statements => Copy_Into_R_S (I, I = Nb_Opnds)));
end loop;
- Append_To (Declare_Stmts, Make_Return_Statement (Loc, Expression => R));
+ Append_To
+ (Declare_Stmts, Make_Simple_Return_Statement (Loc, Expression => R));
-- Construct the declare block
-- Note that this does *not* fix the array concatenation bug when the
-- low bound is Integer'first sibce that bug comes from the pointer
- -- dereferencing an unconstrained array. An there we need a constraint
+ -- dereferencing an unconstrained array. And there we need a constraint
-- check to make sure the length of the concatenated array is ok. ???
Insert_Action (Cnode, Func_Body, Suppress => All_Checks);
procedure Expand_N_Allocator (N : Node_Id) is
PtrT : constant Entity_Id := Etype (N);
Dtyp : constant Entity_Id := Designated_Type (PtrT);
- Desig : Entity_Id;
+ Etyp : constant Entity_Id := Etype (Expression (N));
Loc : constant Source_Ptr := Sloc (N);
+ Desig : Entity_Id;
Temp : Entity_Id;
- Node : Node_Id;
+ Nod : Node_Id;
+
+ procedure Complete_Coextension_Finalization;
+ -- Generate finalization calls for all nested coextensions of N. This
+ -- routine may allocate list controllers if necessary.
+
+ procedure Rewrite_Coextension (N : Node_Id);
+ -- Static coextensions have the same lifetime as the entity they
+ -- constrain. Such occurrences can be rewritten as aliased objects
+ -- and their unrestricted access used instead of the coextension.
+
+ ---------------------------------------
+ -- Complete_Coextension_Finalization --
+ ---------------------------------------
+
+ procedure Complete_Coextension_Finalization is
+ Coext : Node_Id;
+ Coext_Elmt : Elmt_Id;
+ Flist : Node_Id;
+ Ref : Node_Id;
+
+ function Inside_A_Return_Statement (N : Node_Id) return Boolean;
+ -- Determine whether node N is part of a return statement
+
+ function Needs_Initialization_Call (N : Node_Id) return Boolean;
+ -- Determine whether node N is a subtype indicator allocator which
+ -- acts a coextension. Such coextensions need initialization.
+
+ -------------------------------
+ -- Inside_A_Return_Statement --
+ -------------------------------
+
+ function Inside_A_Return_Statement (N : Node_Id) return Boolean is
+ P : Node_Id;
+
+ begin
+ P := Parent (N);
+ while Present (P) loop
+ if Nkind_In
+ (P, N_Extended_Return_Statement, N_Simple_Return_Statement)
+ then
+ return True;
+
+ -- Stop the traversal when we reach a subprogram body
+
+ elsif Nkind (P) = N_Subprogram_Body then
+ return False;
+ end if;
+
+ P := Parent (P);
+ end loop;
+
+ return False;
+ end Inside_A_Return_Statement;
+
+ -------------------------------
+ -- Needs_Initialization_Call --
+ -------------------------------
+
+ function Needs_Initialization_Call (N : Node_Id) return Boolean is
+ Obj_Decl : Node_Id;
+
+ begin
+ if Nkind (N) = N_Explicit_Dereference
+ and then Nkind (Prefix (N)) = N_Identifier
+ and then Nkind (Parent (Entity (Prefix (N)))) =
+ N_Object_Declaration
+ then
+ Obj_Decl := Parent (Entity (Prefix (N)));
+
+ return
+ Present (Expression (Obj_Decl))
+ and then Nkind (Expression (Obj_Decl)) = N_Allocator
+ and then Nkind (Expression (Expression (Obj_Decl))) /=
+ N_Qualified_Expression;
+ end if;
+
+ return False;
+ end Needs_Initialization_Call;
+
+ -- Start of processing for Complete_Coextension_Finalization
+
+ begin
+ -- When a coextension root is inside a return statement, we need to
+ -- use the finalization chain of the function's scope. This does not
+ -- apply for controlled named access types because in those cases we
+ -- can use the finalization chain of the type itself.
+
+ if Inside_A_Return_Statement (N)
+ and then
+ (Ekind (PtrT) = E_Anonymous_Access_Type
+ or else
+ (Ekind (PtrT) = E_Access_Type
+ and then No (Associated_Final_Chain (PtrT))))
+ then
+ declare
+ Decl : Node_Id;
+ Outer_S : Entity_Id;
+ S : Entity_Id := Current_Scope;
+
+ begin
+ while Present (S) and then S /= Standard_Standard loop
+ if Ekind (S) = E_Function then
+ Outer_S := Scope (S);
+
+ -- Retrieve the declaration of the body
+
+ Decl := Parent (Parent (
+ Corresponding_Body (Parent (Parent (S)))));
+ exit;
+ end if;
+
+ S := Scope (S);
+ end loop;
+
+ -- Push the scope of the function body since we are inserting
+ -- the list before the body, but we are currently in the body
+ -- itself. Override the finalization list of PtrT since the
+ -- finalization context is now different.
+
+ Push_Scope (Outer_S);
+ Build_Final_List (Decl, PtrT);
+ Pop_Scope;
+ end;
+
+ -- The root allocator may not be controlled, but it still needs a
+ -- finalization list for all nested coextensions.
+
+ elsif No (Associated_Final_Chain (PtrT)) then
+ Build_Final_List (N, PtrT);
+ end if;
+
+ Flist :=
+ Make_Selected_Component (Loc,
+ Prefix =>
+ New_Reference_To (Associated_Final_Chain (PtrT), Loc),
+ Selector_Name =>
+ Make_Identifier (Loc, Name_F));
+
+ Coext_Elmt := First_Elmt (Coextensions (N));
+ while Present (Coext_Elmt) loop
+ Coext := Node (Coext_Elmt);
+
+ -- Generate:
+ -- typ! (coext.all)
+
+ if Nkind (Coext) = N_Identifier then
+ Ref := Make_Unchecked_Type_Conversion (Loc,
+ Subtype_Mark =>
+ New_Reference_To (Etype (Coext), Loc),
+ Expression =>
+ Make_Explicit_Dereference (Loc,
+ New_Copy_Tree (Coext)));
+ else
+ Ref := New_Copy_Tree (Coext);
+ end if;
+
+ -- No initialization call if not allowed
+
+ Check_Restriction (No_Default_Initialization, N);
+
+ if not Restriction_Active (No_Default_Initialization) then
+
+ -- Generate:
+ -- initialize (Ref)
+ -- attach_to_final_list (Ref, Flist, 2)
+
+ if Needs_Initialization_Call (Coext) then
+ Insert_Actions (N,
+ Make_Init_Call (
+ Ref => Ref,
+ Typ => Etype (Coext),
+ Flist_Ref => Flist,
+ With_Attach => Make_Integer_Literal (Loc, Uint_2)));
+
+ -- Generate:
+ -- attach_to_final_list (Ref, Flist, 2)
+
+ else
+ Insert_Action (N,
+ Make_Attach_Call (
+ Obj_Ref => Ref,
+ Flist_Ref => New_Copy_Tree (Flist),
+ With_Attach => Make_Integer_Literal (Loc, Uint_2)));
+ end if;
+ end if;
+
+ Next_Elmt (Coext_Elmt);
+ end loop;
+ end Complete_Coextension_Finalization;
+
+ -------------------------
+ -- Rewrite_Coextension --
+ -------------------------
+
+ procedure Rewrite_Coextension (N : Node_Id) is
+ Temp : constant Node_Id :=
+ Make_Defining_Identifier (Loc,
+ New_Internal_Name ('C'));
+
+ -- Generate:
+ -- Cnn : aliased Etyp;
+
+ Decl : constant Node_Id :=
+ Make_Object_Declaration (Loc,
+ Defining_Identifier => Temp,
+ Aliased_Present => True,
+ Object_Definition =>
+ New_Occurrence_Of (Etyp, Loc));
+ Nod : Node_Id;
+
+ begin
+ if Nkind (Expression (N)) = N_Qualified_Expression then
+ Set_Expression (Decl, Expression (Expression (N)));
+ end if;
+
+ -- Find the proper insertion node for the declaration
+
+ Nod := Parent (N);
+ while Present (Nod) loop
+ exit when Nkind (Nod) in N_Statement_Other_Than_Procedure_Call
+ or else Nkind (Nod) = N_Procedure_Call_Statement
+ or else Nkind (Nod) in N_Declaration;
+ Nod := Parent (Nod);
+ end loop;
+
+ Insert_Before (Nod, Decl);
+ Analyze (Decl);
+
+ Rewrite (N,
+ Make_Attribute_Reference (Loc,
+ Prefix => New_Occurrence_Of (Temp, Loc),
+ Attribute_Name => Name_Unrestricted_Access));
+
+ Analyze_And_Resolve (N, PtrT);
+ end Rewrite_Coextension;
+
+ -- Start of processing for Expand_N_Allocator
begin
-- RM E.2.3(22). We enforce that the expected type of an allocator
if Present (Storage_Pool (N)) then
if Is_RTE (Storage_Pool (N), RE_SS_Pool) then
- if not Java_VM then
+ if VM_Target = No_VM then
Set_Procedure_To_Call (N, RTE (RE_SS_Allocate));
end if;
Desig := Subtype_Mark (Expression (N));
-- If context is constrained, use constrained subtype directly,
- -- so that the constant is not labelled as having a nomimally
+ -- so that the constant is not labelled as having a nominally
-- unconstrained subtype.
if Entity (Desig) = Base_Type (Dtyp) then
return;
end if;
+ -- Same if the allocator is an access discriminant for a local object:
+ -- instead of an allocator we create a local value and constrain the
+ -- the enclosing object with the corresponding access attribute.
+
+ if Is_Static_Coextension (N) then
+ Rewrite_Coextension (N);
+ return;
+ end if;
+
+ -- The current allocator creates an object which may contain nested
+ -- coextensions. Use the current allocator's finalization list to
+ -- generate finalization call for all nested coextensions.
+
+ if Is_Coextension_Root (N) then
+ Complete_Coextension_Finalization;
+ end if;
+
-- Handle case of qualified expression (other than optimization above)
if Nkind (Expression (N)) = N_Qualified_Expression then
Expand_Allocator_Expression (N);
+ return;
+ end if;
- -- If the allocator is for a type which requires initialization, and
- -- there is no initial value (i.e. operand is a subtype indication
- -- rather than a qualifed expression), then we must generate a call
- -- to the initialization routine. This is done using an expression
- -- actions node:
- --
- -- [Pnnn : constant ptr_T := new (T); Init (Pnnn.all,...); Pnnn]
- --
- -- Here ptr_T is the pointer type for the allocator, and T is the
- -- subtype of the allocator. A special case arises if the designated
- -- type of the access type is a task or contains tasks. In this case
- -- the call to Init (Temp.all ...) is replaced by code that ensures
- -- that tasks get activated (see Exp_Ch9.Build_Task_Allocate_Block
- -- for details). In addition, if the type T is a task T, then the
- -- first argument to Init must be converted to the task record type.
+ -- If the allocator is for a type which requires initialization, and
+ -- there is no initial value (i.e. operand is a subtype indication
+ -- rather than a qualified expression), then we must generate a call
+ -- to the initialization routine. This is done using an expression
+ -- actions node:
- else
- declare
- T : constant Entity_Id := Entity (Expression (N));
- Init : Entity_Id;
- Arg1 : Node_Id;
- Args : List_Id;
- Decls : List_Id;
- Decl : Node_Id;
- Discr : Elmt_Id;
- Flist : Node_Id;
- Temp_Decl : Node_Id;
- Temp_Type : Entity_Id;
- Attach_Level : Uint;
+ -- [Pnnn : constant ptr_T := new (T); Init (Pnnn.all,...); Pnnn]
- begin
- if No_Initialization (N) then
- null;
+ -- Here ptr_T is the pointer type for the allocator, and T is the
+ -- subtype of the allocator. A special case arises if the designated
+ -- type of the access type is a task or contains tasks. In this case
+ -- the call to Init (Temp.all ...) is replaced by code that ensures
+ -- that tasks get activated (see Exp_Ch9.Build_Task_Allocate_Block
+ -- for details). In addition, if the type T is a task T, then the
+ -- first argument to Init must be converted to the task record type.
- -- Case of no initialization procedure present
+ declare
+ T : constant Entity_Id := Entity (Expression (N));
+ Init : Entity_Id;
+ Arg1 : Node_Id;
+ Args : List_Id;
+ Decls : List_Id;
+ Decl : Node_Id;
+ Discr : Elmt_Id;
+ Flist : Node_Id;
+ Temp_Decl : Node_Id;
+ Temp_Type : Entity_Id;
+ Attach_Level : Uint;
- elsif not Has_Non_Null_Base_Init_Proc (T) then
+ begin
+ if No_Initialization (N) then
+ null;
- -- Case of simple initialization required
+ -- Case of no initialization procedure present
- if Needs_Simple_Initialization (T) then
- Rewrite (Expression (N),
- Make_Qualified_Expression (Loc,
- Subtype_Mark => New_Occurrence_Of (T, Loc),
- Expression => Get_Simple_Init_Val (T, Loc)));
+ elsif not Has_Non_Null_Base_Init_Proc (T) then
- Analyze_And_Resolve (Expression (Expression (N)), T);
- Analyze_And_Resolve (Expression (N), T);
- Set_Paren_Count (Expression (Expression (N)), 1);
- Expand_N_Allocator (N);
+ -- Case of simple initialization required
- -- No initialization required
+ if Needs_Simple_Initialization (T) then
+ Check_Restriction (No_Default_Initialization, N);
+ Rewrite (Expression (N),
+ Make_Qualified_Expression (Loc,
+ Subtype_Mark => New_Occurrence_Of (T, Loc),
+ Expression => Get_Simple_Init_Val (T, N)));
- else
- null;
- end if;
+ Analyze_And_Resolve (Expression (Expression (N)), T);
+ Analyze_And_Resolve (Expression (N), T);
+ Set_Paren_Count (Expression (Expression (N)), 1);
+ Expand_N_Allocator (N);
- -- Case of initialization procedure present, must be called
+ -- No initialization required
else
+ null;
+ end if;
+
+ -- Case of initialization procedure present, must be called
+
+ else
+ Check_Restriction (No_Default_Initialization, N);
+
+ if not Restriction_Active (No_Default_Initialization) then
Init := Base_Init_Proc (T);
- Node := N;
- Temp :=
- Make_Defining_Identifier (Loc, New_Internal_Name ('P'));
+ Nod := N;
+ Temp := Make_Defining_Identifier (Loc, New_Internal_Name ('P'));
-- Construct argument list for the initialization routine call
- -- The CPP constructor needs the address directly
-
- if Is_CPP_Class (T) then
- Arg1 := New_Reference_To (Temp, Loc);
- Temp_Type := T;
- else
- Arg1 :=
- Make_Explicit_Dereference (Loc,
- Prefix => New_Reference_To (Temp, Loc));
- Set_Assignment_OK (Arg1);
- Temp_Type := PtrT;
+ Arg1 :=
+ Make_Explicit_Dereference (Loc,
+ Prefix => New_Reference_To (Temp, Loc));
+ Set_Assignment_OK (Arg1);
+ Temp_Type := PtrT;
- -- The initialization procedure expects a specific type.
- -- if the context is access to class wide, indicate that
- -- the object being allocated has the right specific type.
+ -- The initialization procedure expects a specific type. if the
+ -- context is access to class wide, indicate that the object
+ -- being allocated has the right specific type.
- if Is_Class_Wide_Type (Dtyp) then
- Arg1 := Unchecked_Convert_To (T, Arg1);
- end if;
+ if Is_Class_Wide_Type (Dtyp) then
+ Arg1 := Unchecked_Convert_To (T, Arg1);
end if;
- -- If designated type is a concurrent type or if it is a
- -- private type whose definition is a concurrent type,
- -- the first argument in the Init routine has to be
- -- unchecked conversion to the corresponding record type.
- -- If the designated type is a derived type, we also
- -- convert the argument to its root type.
+ -- If designated type is a concurrent type or if it is private
+ -- type whose definition is a concurrent type, the first
+ -- argument in the Init routine has to be unchecked conversion
+ -- to the corresponding record type. If the designated type is
+ -- a derived type, we also convert the argument to its root
+ -- type.
if Is_Concurrent_Type (T) then
Arg1 :=
(Corresponding_Record_Type (Full_View (T)), Arg1);
elsif Etype (First_Formal (Init)) /= Base_Type (T) then
-
declare
Ftyp : constant Entity_Id := Etype (First_Formal (Init));
-
begin
Arg1 := OK_Convert_To (Etype (Ftyp), Arg1);
Set_Etype (Arg1, Ftyp);
Args := New_List (Arg1);
- -- For the task case, pass the Master_Id of the access type
- -- as the value of the _Master parameter, and _Chain as the
- -- value of the _Chain parameter (_Chain will be defined as
- -- part of the generated code for the allocator).
+ -- For the task case, pass the Master_Id of the access type as
+ -- the value of the _Master parameter, and _Chain as the value
+ -- of the _Chain parameter (_Chain will be defined as part of
+ -- the generated code for the allocator).
+
+ -- In Ada 2005, the context may be a function that returns an
+ -- anonymous access type. In that case the Master_Id has been
+ -- created when expanding the function declaration.
if Has_Task (T) then
if No (Master_Id (Base_Type (PtrT))) then
- -- The designated type was an incomplete type, and
- -- the access type did not get expanded. Salvage
- -- it now.
+ -- If we have a non-library level task with restriction
+ -- No_Task_Hierarchy set, then no point in expanding.
+ if not Is_Library_Level_Entity (T)
+ and then Restriction_Active (No_Task_Hierarchy)
+ then
+ return;
+ end if;
+
+ -- The designated type was an incomplete type, and the
+ -- access type did not get expanded. Salvage it now.
+
+ pragma Assert (Present (Parent (Base_Type (PtrT))));
Expand_N_Full_Type_Declaration
(Parent (Base_Type (PtrT)));
end if;
- -- If the context of the allocator is a declaration or
- -- an assignment, we can generate a meaningful image for
- -- it, even though subsequent assignments might remove
- -- the connection between task and entity. We build this
- -- image when the left-hand side is a simple variable,
- -- a simple indexed assignment or a simple selected
- -- component.
+ -- If the context of the allocator is a declaration or an
+ -- assignment, we can generate a meaningful image for it,
+ -- even though subsequent assignments might remove the
+ -- connection between task and entity. We build this image
+ -- when the left-hand side is a simple variable, a simple
+ -- indexed assignment or a simple selected component.
if Nkind (Parent (N)) = N_Assignment_Statement then
declare
begin
if Is_Entity_Name (Nam) then
Decls :=
- Build_Task_Image_Decls (
- Loc,
- New_Occurrence_Of
- (Entity (Nam), Sloc (Nam)), T);
+ Build_Task_Image_Decls
+ (Loc,
+ New_Occurrence_Of
+ (Entity (Nam), Sloc (Nam)), T);
- elsif (Nkind (Nam) = N_Indexed_Component
- or else Nkind (Nam) = N_Selected_Component)
+ elsif Nkind_In
+ (Nam, N_Indexed_Component, N_Selected_Component)
and then Is_Entity_Name (Prefix (Nam))
then
Decls :=
elsif Nkind (Parent (N)) = N_Object_Declaration then
Decls :=
- Build_Task_Image_Decls (
- Loc, Defining_Identifier (Parent (N)), T);
+ Build_Task_Image_Decls
+ (Loc, Defining_Identifier (Parent (N)), T);
else
Decls := Build_Task_Image_Decls (Loc, T, T);
Append_To (Args,
New_Occurrence_Of (Defining_Identifier (Decl), Loc));
- -- Has_Task is false, Decls not used
+ -- Has_Task is false, Decls not used
else
Decls := No_List;
-- Add discriminants if discriminated type
- if Has_Discriminants (T) then
- Discr := First_Elmt (Discriminant_Constraint (T));
+ declare
+ Dis : Boolean := False;
+ Typ : Entity_Id;
- while Present (Discr) loop
- Append (New_Copy_Tree (Elists.Node (Discr)), Args);
- Next_Elmt (Discr);
- end loop;
+ begin
+ if Has_Discriminants (T) then
+ Dis := True;
+ Typ := T;
- elsif Is_Private_Type (T)
- and then Present (Full_View (T))
- and then Has_Discriminants (Full_View (T))
- then
- Discr :=
- First_Elmt (Discriminant_Constraint (Full_View (T)));
+ elsif Is_Private_Type (T)
+ and then Present (Full_View (T))
+ and then Has_Discriminants (Full_View (T))
+ then
+ Dis := True;
+ Typ := Full_View (T);
+ end if;
- while Present (Discr) loop
- Append (New_Copy_Tree (Elists.Node (Discr)), Args);
- Next_Elmt (Discr);
- end loop;
- end if;
+ if Dis then
+
+ -- If the allocated object will be constrained by the
+ -- default values for discriminants, then build a
+ -- subtype with those defaults, and change the allocated
+ -- subtype to that. Note that this happens in fewer
+ -- cases in Ada 2005 (AI-363).
+
+ if not Is_Constrained (Typ)
+ and then Present (Discriminant_Default_Value
+ (First_Discriminant (Typ)))
+ and then (Ada_Version < Ada_05
+ or else
+ not Has_Constrained_Partial_View (Typ))
+ then
+ Typ := Build_Default_Subtype (Typ, N);
+ Set_Expression (N, New_Reference_To (Typ, Loc));
+ end if;
+
+ Discr := First_Elmt (Discriminant_Constraint (Typ));
+ while Present (Discr) loop
+ Nod := Node (Discr);
+ Append (New_Copy_Tree (Node (Discr)), Args);
+
+ -- AI-416: when the discriminant constraint is an
+ -- anonymous access type make sure an accessibility
+ -- check is inserted if necessary (3.10.2(22.q/2))
+
+ if Ada_Version >= Ada_05
+ and then
+ Ekind (Etype (Nod)) = E_Anonymous_Access_Type
+ then
+ Apply_Accessibility_Check (Nod, Typ);
+ end if;
+
+ Next_Elmt (Discr);
+ end loop;
+ end if;
+ end;
-- We set the allocator as analyzed so that when we analyze the
-- expression actions node, we do not get an unwanted recursive
-- expansion of the allocator expression.
Set_Analyzed (N, True);
- Node := Relocate_Node (N);
+ Nod := Relocate_Node (N);
-- Here is the transformation:
-- input: new T
-- <CTRL> Attach_To_Final_List (Finalizable (Temp.all));
-- <CTRL> Initialize (Finalizable (Temp.all));
- -- Here ptr_T is the pointer type for the allocator, and T
- -- is the subtype of the allocator.
+ -- Here ptr_T is the pointer type for the allocator, and is the
+ -- subtype of the allocator.
Temp_Decl :=
Make_Object_Declaration (Loc,
Defining_Identifier => Temp,
Constant_Present => True,
Object_Definition => New_Reference_To (Temp_Type, Loc),
- Expression => Node);
+ Expression => Nod);
Set_Assignment_OK (Temp_Decl);
-
- if Is_CPP_Class (T) then
- Set_Aliased_Present (Temp_Decl);
- end if;
-
Insert_Action (N, Temp_Decl, Suppress => All_Checks);
- -- If the designated type is task type or contains tasks,
- -- Create block to activate created tasks, and insert
+ -- If the designated type is a task type or contains tasks,
+ -- create block to activate created tasks, and insert
-- declaration for Task_Image variable ahead of call.
if Has_Task (T) then
declare
L : constant List_Id := New_List;
Blk : Node_Id;
-
begin
- Build_Task_Allocate_Block (L, Node, Args);
+ Build_Task_Allocate_Block (L, Nod, Args);
Blk := Last (L);
-
Insert_List_Before (First (Declarations (Blk)), Decls);
Insert_Actions (N, L);
end;
else
Insert_Action (N,
Make_Procedure_Call_Statement (Loc,
- Name => New_Reference_To (Init, Loc),
+ Name => New_Reference_To (Init, Loc),
Parameter_Associations => Args));
end if;
if Controlled_Type (T) then
- Flist := Get_Allocator_Final_List (N, Base_Type (T), PtrT);
- if Ekind (PtrT) = E_Anonymous_Access_Type then
- Attach_Level := Uint_1;
+
+ -- Postpone the generation of a finalization call for the
+ -- current allocator if it acts as a coextension.
+
+ if Is_Dynamic_Coextension (N) then
+ if No (Coextensions (N)) then
+ Set_Coextensions (N, New_Elmt_List);
+ end if;
+
+ Append_Elmt (New_Copy_Tree (Arg1), Coextensions (N));
+
else
- Attach_Level := Uint_2;
- end if;
- Insert_Actions (N,
- Make_Init_Call (
- Ref => New_Copy_Tree (Arg1),
- Typ => T,
- Flist_Ref => Flist,
- With_Attach => Make_Integer_Literal (Loc,
- Attach_Level)));
- end if;
+ Flist :=
+ Get_Allocator_Final_List (N, Base_Type (T), PtrT);
- if Is_CPP_Class (T) then
- Rewrite (N,
- Make_Attribute_Reference (Loc,
- Prefix => New_Reference_To (Temp, Loc),
- Attribute_Name => Name_Unchecked_Access));
- else
- Rewrite (N, New_Reference_To (Temp, Loc));
+ -- Anonymous access types created for access parameters
+ -- are attached to an explicitly constructed controller,
+ -- which ensures that they can be finalized properly,
+ -- even if their deallocation might not happen. The list
+ -- associated with the controller is doubly-linked. For
+ -- other anonymous access types, the object may end up
+ -- on the global final list which is singly-linked.
+ -- Work needed for access discriminants in Ada 2005 ???
+
+ if Ekind (PtrT) = E_Anonymous_Access_Type
+ and then
+ Nkind (Associated_Node_For_Itype (PtrT))
+ not in N_Subprogram_Specification
+ then
+ Attach_Level := Uint_1;
+ else
+ Attach_Level := Uint_2;
+ end if;
+
+ Insert_Actions (N,
+ Make_Init_Call (
+ Ref => New_Copy_Tree (Arg1),
+ Typ => T,
+ Flist_Ref => Flist,
+ With_Attach => Make_Integer_Literal (Loc,
+ Intval => Attach_Level)));
+ end if;
end if;
+ Rewrite (N, New_Reference_To (Temp, Loc));
Analyze_And_Resolve (N, PtrT);
end if;
- end;
+ end if;
+ end;
+
+ -- Ada 2005 (AI-251): If the allocator is for a class-wide interface
+ -- object that has been rewritten as a reference, we displace "this"
+ -- to reference properly its secondary dispatch table.
+
+ if Nkind (N) = N_Identifier
+ and then Is_Interface (Dtyp)
+ then
+ Displace_Allocator_Pointer (N);
end if;
exception
-- Expand_N_And_Then --
-----------------------
- -- Expand into conditional expression if Actions present, and also
- -- deal with optimizing case of arguments being True or False.
+ -- Expand into conditional expression if Actions present, and also deal
+ -- with optimizing case of arguments being True or False.
procedure Expand_N_And_Then (N : Node_Id) is
Loc : constant Source_Ptr := Sloc (N);
Adjust_Result_Type (N, Typ);
return;
- -- If left argument is False, change (False and then Right) to
- -- False. In this case we can forget the actions associated with
- -- Right, since they will never be executed.
+ -- If left argument is False, change (False and then Right) to False.
+ -- In this case we can forget the actions associated with Right,
+ -- since they will never be executed.
elsif Entity (Left) = Standard_False then
Kill_Dead_Code (Right);
-- Cnn := else-expr
-- end if;
- -- and replace the conditional expression by a reference to Cnn.
+ -- and replace the conditional expression by a reference to Cnn
if Present (Then_Actions (N)) or else Present (Else_Actions (N)) then
Cnn := Make_Defining_Identifier (Loc, New_Internal_Name ('C'));
procedure Expand_N_Explicit_Dereference (N : Node_Id) is
begin
- -- The only processing required is an insertion of an explicit
- -- dereference call for the checked storage pool case.
+ -- Insert explicit dereference call for the checked storage pool case
Insert_Dereference_Action (Prefix (N));
end Expand_N_Explicit_Dereference;
Rop : constant Node_Id := Right_Opnd (N);
Static : constant Boolean := Is_OK_Static_Expression (N);
+ procedure Substitute_Valid_Check;
+ -- Replaces node N by Lop'Valid. This is done when we have an explicit
+ -- test for the left operand being in range of its subtype.
+
+ ----------------------------
+ -- Substitute_Valid_Check --
+ ----------------------------
+
+ procedure Substitute_Valid_Check is
+ begin
+ Rewrite (N,
+ Make_Attribute_Reference (Loc,
+ Prefix => Relocate_Node (Lop),
+ Attribute_Name => Name_Valid));
+
+ Analyze_And_Resolve (N, Rtyp);
+
+ Error_Msg_N ("?explicit membership test may be optimized away", N);
+ Error_Msg_N ("\?use ''Valid attribute instead", N);
+ return;
+ end Substitute_Valid_Check;
+
+ -- Start of processing for Expand_N_In
+
begin
- -- If we have an explicit range, do a bit of optimization based
- -- on range analysis (we may be able to kill one or both checks).
+ -- Check case of explicit test for an expression in range of its
+ -- subtype. This is suspicious usage and we replace it with a 'Valid
+ -- test and give a warning.
+
+ if Is_Scalar_Type (Etype (Lop))
+ and then Nkind (Rop) in N_Has_Entity
+ and then Etype (Lop) = Entity (Rop)
+ and then Comes_From_Source (N)
+ and then VM_Target = No_VM
+ then
+ Substitute_Valid_Check;
+ return;
+ end if;
+
+ -- Do validity check on operands
+
+ if Validity_Checks_On and Validity_Check_Operands then
+ Ensure_Valid (Left_Opnd (N));
+ Validity_Check_Range (Right_Opnd (N));
+ end if;
+
+ -- Case of explicit range
if Nkind (Rop) = N_Range then
declare
- Lcheck : constant Compare_Result :=
- Compile_Time_Compare (Lop, Low_Bound (Rop));
- Ucheck : constant Compare_Result :=
- Compile_Time_Compare (Lop, High_Bound (Rop));
+ Lo : constant Node_Id := Low_Bound (Rop);
+ Hi : constant Node_Id := High_Bound (Rop);
+
+ Ltyp : constant Entity_Id := Etype (Lop);
+
+ Lo_Orig : constant Node_Id := Original_Node (Lo);
+ Hi_Orig : constant Node_Id := Original_Node (Hi);
+
+ Lcheck : constant Compare_Result := Compile_Time_Compare (Lop, Lo);
+ Ucheck : constant Compare_Result := Compile_Time_Compare (Lop, Hi);
+
+ Warn1 : constant Boolean :=
+ Constant_Condition_Warnings
+ and then Comes_From_Source (N);
+ -- This must be true for any of the optimization warnings, we
+ -- clearly want to give them only for source with the flag on.
+
+ Warn2 : constant Boolean :=
+ Warn1
+ and then Nkind (Original_Node (Rop)) = N_Range
+ and then Is_Integer_Type (Etype (Lo));
+ -- For the case where only one bound warning is elided, we also
+ -- insist on an explicit range and an integer type. The reason is
+ -- that the use of enumeration ranges including an end point is
+ -- common, as is the use of a subtype name, one of whose bounds
+ -- is the same as the type of the expression.
begin
- -- If either check is known to fail, replace result
- -- by False, since the other check does not matter.
- -- Preserve the static flag for legality checks, because
- -- we are constant-folding beyond RM 4.9.
+ -- If test is explicit x'first .. x'last, replace by valid check
+
+ if Is_Scalar_Type (Ltyp)
+ and then Nkind (Lo_Orig) = N_Attribute_Reference
+ and then Attribute_Name (Lo_Orig) = Name_First
+ and then Nkind (Prefix (Lo_Orig)) in N_Has_Entity
+ and then Entity (Prefix (Lo_Orig)) = Ltyp
+ and then Nkind (Hi_Orig) = N_Attribute_Reference
+ and then Attribute_Name (Hi_Orig) = Name_Last
+ and then Nkind (Prefix (Hi_Orig)) in N_Has_Entity
+ and then Entity (Prefix (Hi_Orig)) = Ltyp
+ and then Comes_From_Source (N)
+ and then VM_Target = No_VM
+ then
+ Substitute_Valid_Check;
+ return;
+ end if;
+
+ -- If bounds of type are known at compile time, and the end points
+ -- are known at compile time and identical, this is another case
+ -- for substituting a valid test. We only do this for discrete
+ -- types, since it won't arise in practice for float types.
+
+ if Comes_From_Source (N)
+ and then Is_Discrete_Type (Ltyp)
+ and then Compile_Time_Known_Value (Type_High_Bound (Ltyp))
+ and then Compile_Time_Known_Value (Type_Low_Bound (Ltyp))
+ and then Compile_Time_Known_Value (Lo)
+ and then Compile_Time_Known_Value (Hi)
+ and then Expr_Value (Type_High_Bound (Ltyp)) = Expr_Value (Hi)
+ and then Expr_Value (Type_Low_Bound (Ltyp)) = Expr_Value (Lo)
+ then
+ Substitute_Valid_Check;
+ return;
+ end if;
+
+ -- If we have an explicit range, do a bit of optimization based
+ -- on range analysis (we may be able to kill one or both checks).
+
+ -- If either check is known to fail, replace result by False since
+ -- the other check does not matter. Preserve the static flag for
+ -- legality checks, because we are constant-folding beyond RM 4.9.
if Lcheck = LT or else Ucheck = GT then
+ if Warn1 then
+ Error_Msg_N ("?range test optimized away", N);
+ Error_Msg_N ("\?value is known to be out of range", N);
+ end if;
+
Rewrite (N,
New_Reference_To (Standard_False, Loc));
Analyze_And_Resolve (N, Rtyp);
Set_Is_Static_Expression (N, Static);
+
return;
-- If both checks are known to succeed, replace result
-- by True, since we know we are in range.
elsif Lcheck in Compare_GE and then Ucheck in Compare_LE then
+ if Warn1 then
+ Error_Msg_N ("?range test optimized away", N);
+ Error_Msg_N ("\?value is known to be in range", N);
+ end if;
+
Rewrite (N,
New_Reference_To (Standard_True, Loc));
Analyze_And_Resolve (N, Rtyp);
Set_Is_Static_Expression (N, Static);
+
return;
- -- If lower bound check succeeds and upper bound check is
- -- not known to succeed or fail, then replace the range check
- -- with a comparison against the upper bound.
+ -- If lower bound check succeeds and upper bound check is not
+ -- known to succeed or fail, then replace the range check with
+ -- a comparison against the upper bound.
elsif Lcheck in Compare_GE then
+ if Warn2 then
+ Error_Msg_N ("?lower bound test optimized away", Lo);
+ Error_Msg_N ("\?value is known to be in range", Lo);
+ end if;
+
Rewrite (N,
Make_Op_Le (Loc,
Left_Opnd => Lop,
Right_Opnd => High_Bound (Rop)));
Analyze_And_Resolve (N, Rtyp);
+
return;
- -- If upper bound check succeeds and lower bound check is
- -- not known to succeed or fail, then replace the range check
- -- with a comparison against the lower bound.
+ -- If upper bound check succeeds and lower bound check is not
+ -- known to succeed or fail, then replace the range check with
+ -- a comparison against the lower bound.
elsif Ucheck in Compare_LE then
+ if Warn2 then
+ Error_Msg_N ("?upper bound test optimized away", Hi);
+ Error_Msg_N ("\?value is known to be in range", Hi);
+ end if;
+
Rewrite (N,
Make_Op_Ge (Loc,
Left_Opnd => Lop,
Right_Opnd => Low_Bound (Rop)));
Analyze_And_Resolve (N, Rtyp);
+
return;
end if;
end;
if Is_Tagged_Type (Typ) then
- -- No expansion will be performed when Java_VM, as the
- -- JVM back end will handle the membership tests directly
- -- (tags are not explicitly represented in Java objects,
- -- so the normal tagged membership expansion is not what
- -- we want).
+ -- No expansion will be performed when VM_Target, as the VM
+ -- back-ends will handle the membership tests directly (tags
+ -- are not explicitly represented in Java objects, so the
+ -- normal tagged membership expansion is not what we want).
- if not Java_VM then
+ if VM_Target = No_VM then
Rewrite (N, Tagged_Membership (N));
Analyze_And_Resolve (N, Rtyp);
end if;
return;
- -- If type is scalar type, rewrite as x in t'first .. t'last
+ -- If type is scalar type, rewrite as x in t'first .. t'last.
-- This reason we do this is that the bounds may have the wrong
-- type if they come from the original type definition.
return;
end if;
+ -- Ada 2005 (AI-318-02): If the prefix is a call to a build-in-place
+ -- function, then additional actuals must be passed.
+
+ if Ada_Version >= Ada_05
+ and then Is_Build_In_Place_Function_Call (P)
+ then
+ Make_Build_In_Place_Call_In_Anonymous_Context (P);
+ end if;
+
-- If the prefix is an access type, then we unconditionally rewrite
-- if as an explicit deference. This simplifies processing for several
-- cases, including packed array cases and certain cases in which
-- was necessary, but it cleans up the code to do it all the time.
if Is_Access_Type (T) then
- Rewrite (P,
- Make_Explicit_Dereference (Sloc (N),
- Prefix => Relocate_Node (P)));
+ Insert_Explicit_Dereference (P);
Analyze_And_Resolve (P, Designated_Type (T));
end if;
end if;
-- For packed arrays that are not bit-packed (i.e. the case of an array
- -- with one or more index types with a non-coniguous enumeration type),
+ -- with one or more index types with a non-contiguous enumeration type),
-- we can always use the normal packed element get circuit.
if not Is_Bit_Packed_Array (Etype (Prefix (N))) then
if Nkind (Parnt) = N_Unchecked_Expression then
null;
- elsif Nkind (Parnt) = N_Object_Renaming_Declaration
- or else Nkind (Parnt) = N_Procedure_Call_Statement
+ elsif Nkind_In (Parnt, N_Object_Renaming_Declaration,
+ N_Procedure_Call_Statement)
or else (Nkind (Parnt) = N_Parameter_Association
and then
Nkind (Parent (Parnt)) = N_Procedure_Call_Statement)
then
return;
- elsif (Nkind (Parnt) = N_Indexed_Component
- or else Nkind (Parnt) = N_Selected_Component)
+ elsif Nkind_In (Parnt, N_Indexed_Component, N_Selected_Component)
and then Prefix (Parnt) = Child
then
null;
Parnt := Parent (Child);
end loop;
end;
-
end Expand_N_Indexed_Component;
---------------------
-- can be done. This avoids needing to duplicate this expansion code.
procedure Expand_N_Not_In (N : Node_Id) is
- Loc : constant Source_Ptr := Sloc (N);
- Typ : constant Entity_Id := Etype (N);
+ Loc : constant Source_Ptr := Sloc (N);
+ Typ : constant Entity_Id := Etype (N);
+ Cfs : constant Boolean := Comes_From_Source (N);
begin
Rewrite (N,
Make_In (Loc,
Left_Opnd => Left_Opnd (N),
Right_Opnd => Right_Opnd (N))));
+
+ -- We want this to appear as coming from source if original does (see
+ -- transformations in Expand_N_In).
+
+ Set_Comes_From_Source (N, Cfs);
+ Set_Comes_From_Source (Right_Opnd (N), Cfs);
+
+ -- Now analyze transformed node
+
Analyze_And_Resolve (N, Typ);
end Expand_N_Not_In;
Agg : Node_Id;
begin
- if Ekind (Typ) = E_Access_Protected_Subprogram_Type then
+ if Is_Access_Protected_Subprogram_Type (Typ) then
Agg :=
Make_Aggregate (Loc,
Expressions => New_List (
-- Initialize global variables showing run-time status
if Max_Available_String_Operands < 1 then
+
+ -- See what routines are available and set max operand count
+ -- according to the highest count available in the run-time.
+
if not RTE_Available (RE_Str_Concat) then
Max_Available_String_Operands := 0;
+
elsif not RTE_Available (RE_Str_Concat_3) then
Max_Available_String_Operands := 2;
+
elsif not RTE_Available (RE_Str_Concat_4) then
Max_Available_String_Operands := 3;
+
elsif not RTE_Available (RE_Str_Concat_5) then
Max_Available_String_Operands := 4;
+
else
Max_Available_String_Operands := 5;
end if;
------------------------
procedure Expand_N_Op_Divide (N : Node_Id) is
- Loc : constant Source_Ptr := Sloc (N);
- Ltyp : constant Entity_Id := Etype (Left_Opnd (N));
- Rtyp : constant Entity_Id := Etype (Right_Opnd (N));
- Typ : Entity_Id := Etype (N);
+ Loc : constant Source_Ptr := Sloc (N);
+ Lopnd : constant Node_Id := Left_Opnd (N);
+ Ropnd : constant Node_Id := Right_Opnd (N);
+ Ltyp : constant Entity_Id := Etype (Lopnd);
+ Rtyp : constant Entity_Id := Etype (Ropnd);
+ Typ : Entity_Id := Etype (N);
+ Rknow : constant Boolean := Is_Integer_Type (Typ)
+ and then
+ Compile_Time_Known_Value (Ropnd);
+ Rval : Uint;
begin
Binary_Op_Validity_Checks (N);
- -- Vax_Float is a special case
-
- if Vax_Float (Typ) then
- Expand_Vax_Arith (N);
- return;
+ if Rknow then
+ Rval := Expr_Value (Ropnd);
end if;
-- N / 1 = N for integer types
- if Is_Integer_Type (Typ)
- and then Compile_Time_Known_Value (Right_Opnd (N))
- and then Expr_Value (Right_Opnd (N)) = Uint_1
- then
- Rewrite (N, Left_Opnd (N));
+ if Rknow and then Rval = Uint_1 then
+ Rewrite (N, Lopnd);
return;
end if;
-- Is_Power_Of_2_For_Shift is set means that we know that our left
-- operand is an unsigned integer, as required for this to work.
- if Nkind (Right_Opnd (N)) = N_Op_Expon
- and then Is_Power_Of_2_For_Shift (Right_Opnd (N))
+ if Nkind (Ropnd) = N_Op_Expon
+ and then Is_Power_Of_2_For_Shift (Ropnd)
-- We cannot do this transformation in configurable run time mode if we
-- have 64-bit -- integers and long shifts are not available.
then
Rewrite (N,
Make_Op_Shift_Right (Loc,
- Left_Opnd => Left_Opnd (N),
+ Left_Opnd => Lopnd,
Right_Opnd =>
- Convert_To (Standard_Natural, Right_Opnd (Right_Opnd (N)))));
+ Convert_To (Standard_Natural, Right_Opnd (Ropnd))));
Analyze_And_Resolve (N, Typ);
return;
end if;
elsif Typ = Universal_Real
and then Is_Integer_Type (Rtyp)
then
- Rewrite (Right_Opnd (N),
- Convert_To (Universal_Real, Relocate_Node (Right_Opnd (N))));
+ Rewrite (Ropnd,
+ Convert_To (Universal_Real, Relocate_Node (Ropnd)));
- Analyze_And_Resolve (Right_Opnd (N), Universal_Real);
+ Analyze_And_Resolve (Ropnd, Universal_Real);
elsif Typ = Universal_Real
and then Is_Integer_Type (Ltyp)
then
- Rewrite (Left_Opnd (N),
- Convert_To (Universal_Real, Relocate_Node (Left_Opnd (N))));
+ Rewrite (Lopnd,
+ Convert_To (Universal_Real, Relocate_Node (Lopnd)));
- Analyze_And_Resolve (Left_Opnd (N), Universal_Real);
+ Analyze_And_Resolve (Lopnd, Universal_Real);
- -- Non-fixed point cases, do zero divide and overflow checks
+ -- Non-fixed point cases, do integer zero divide and overflow checks
elsif Is_Integer_Type (Typ) then
Apply_Divide_Check (N);
- -- Check for 64-bit division available
+ -- Check for 64-bit division available, or long shifts if the divisor
+ -- is a small power of 2 (since such divides will be converted into
+ -- long shifts.
if Esize (Ltyp) > 32
and then not Support_64_Bit_Divides_On_Target
+ and then
+ (not Rknow
+ or else not Support_Long_Shifts_On_Target
+ or else (Rval /= Uint_2 and then
+ Rval /= Uint_4 and then
+ Rval /= Uint_8 and then
+ Rval /= Uint_16 and then
+ Rval /= Uint_32 and then
+ Rval /= Uint_64))
then
Error_Msg_CRT ("64-bit division", N);
end if;
+
+ -- Deal with Vax_Float
+
+ elsif Vax_Float (Typ) then
+ Expand_Vax_Arith (N);
+ return;
end if;
end Expand_N_Op_Divide;
-- inherited.
function Has_Unconstrained_UU_Component (Typ : Node_Id) return Boolean;
- -- Determines whether a type has a subcompoment of an unconstrained
+ -- Determines whether a type has a subcomponent of an unconstrained
-- Unchecked_Union subtype. Typ is a record type.
-------------------------
begin
-- Per-object constrained selected components require special
-- attention. If the enclosing scope of the component is an
- -- Unchecked_Union, we can not reference its discriminants
+ -- Unchecked_Union, we cannot reference its discriminants
-- directly. This is why we use the two extra parameters of
-- the equality function of the enclosing Unchecked_Union.
-- Obj1 : Enclosing_UU_Type;
-- Obj2 : Enclosing_UU_Type (1);
- -- . . . Obj1 = Obj2 . . .
+ -- [. . .] Obj1 = Obj2 [. . .]
-- Generated code:
-- Obj1 : Enclosing_Non_UU_Type;
-- Obj2 : Enclosing_Non_UU_Type (1);
- -- . . . Obj1 = Obj2 . . .
+ -- ... Obj1 = Obj2 ...
-- Generated code:
-- Lhs of equality
if Nkind (Lhs) = N_Selected_Component
- and then Has_Per_Object_Constraint (
- Entity (Selector_Name (Lhs)))
+ and then Has_Per_Object_Constraint
+ (Entity (Selector_Name (Lhs)))
then
-- Enclosing record is an Unchecked_Union, use formal A
Make_Selected_Component (Loc,
Prefix => Prefix (Lhs),
Selector_Name =>
- New_Copy (Get_Discriminant_Value (
- First_Discriminant (Lhs_Type),
- Lhs_Type,
- Stored_Constraint (Lhs_Type))));
-
+ New_Copy
+ (Get_Discriminant_Value
+ (First_Discriminant (Lhs_Type),
+ Lhs_Type,
+ Stored_Constraint (Lhs_Type))));
end if;
-- Comment needed here ???
-- Infer the discriminant value
Lhs_Discr_Val :=
- New_Copy (Get_Discriminant_Value (
- First_Discriminant (Lhs_Type),
- Lhs_Type,
- Stored_Constraint (Lhs_Type)));
-
+ New_Copy
+ (Get_Discriminant_Value
+ (First_Discriminant (Lhs_Type),
+ Lhs_Type,
+ Stored_Constraint (Lhs_Type)));
end if;
-- Rhs of equality
if Nkind (Rhs) = N_Selected_Component
- and then Has_Per_Object_Constraint (
- Entity (Selector_Name (Rhs)))
+ and then Has_Per_Object_Constraint
+ (Entity (Selector_Name (Rhs)))
then
- if Is_Unchecked_Union (Scope
- (Entity (Selector_Name (Rhs))))
+ if Is_Unchecked_Union
+ (Scope (Entity (Selector_Name (Rhs))))
then
Rhs_Discr_Val :=
Make_Identifier (Loc,
(Typ : Node_Id) return Boolean
is
Tdef : constant Node_Id :=
- Type_Definition (Declaration_Node (Typ));
+ Type_Definition (Declaration_Node (Base_Type (Typ)));
Clist : Node_Id;
Vpart : Node_Id;
return False;
end if;
+ -- We only need to test one component
+
declare
Comp : Node_Id := First (Component_Items (Clist));
begin
while Present (Comp) loop
-
- -- One component is sufficent
-
if Component_Is_Unconstrained_UU (Comp) then
return True;
end if;
begin
while Present (Comp) loop
- -- One component is sufficent
+ -- One component is sufficient
if Component_Is_Unconstrained_UU (Comp) then
return True;
begin
while Present (Variant) loop
- -- One component within a variant is sufficent
+ -- One component within a variant is sufficient
if Variant_Is_Unconstrained_UU (Variant) then
return True;
if Ekind (Typl) = E_Private_Type then
Typl := Underlying_Type (Typl);
-
elsif Ekind (Typl) = E_Private_Subtype then
Typl := Underlying_Type (Base_Type (Typl));
+ else
+ null;
end if;
-- It may happen in error situations that the underlying type is not
Typl := Base_Type (Typl);
- -- Vax float types
-
- if Vax_Float (Typl) then
- Expand_Vax_Comparison (N);
- return;
-
-- Boolean types (requiring handling of non-standard case)
- elsif Is_Boolean_Type (Typl) then
+ if Is_Boolean_Type (Typl) then
Adjust_Condition (Left_Opnd (N));
Adjust_Condition (Right_Opnd (N));
Set_Etype (N, Standard_Boolean);
elsif Is_Array_Type (Typl) then
- -- If we are doing full validity checking, then expand out array
- -- comparisons to make sure that we check the array elements.
+ -- If we are doing full validity checking, and it is possible for the
+ -- array elements to be invalid then expand out array comparisons to
+ -- make sure that we check the array elements.
- if Validity_Check_Operands then
+ if Validity_Check_Operands
+ and then not Is_Known_Valid (Component_Type (Typl))
+ then
declare
Save_Force_Validity_Checks : constant Boolean :=
Force_Validity_Checks;
Force_Validity_Checks := Save_Force_Validity_Checks;
end;
- -- Packed case
+ -- Packed case where both operands are known aligned
- elsif Is_Bit_Packed_Array (Typl) then
+ elsif Is_Bit_Packed_Array (Typl)
+ and then not Is_Possibly_Unaligned_Object (Lhs)
+ and then not Is_Possibly_Unaligned_Object (Rhs)
+ then
Expand_Packed_Eq (N);
- -- For non-floating-point elementary types, the primitive equality
- -- always applies, and block-bit comparison is fine. Floating-point
- -- is an exception because of negative zeroes.
+ -- Where the component type is elementary we can use a block bit
+ -- comparison (if supported on the target) exception in the case
+ -- of floating-point (negative zero issues require element by
+ -- element comparison), and atomic types (where we must be sure
+ -- to load elements independently) and possibly unaligned arrays.
elsif Is_Elementary_Type (Component_Type (Typl))
and then not Is_Floating_Point_Type (Component_Type (Typl))
+ and then not Is_Atomic (Component_Type (Typl))
+ and then not Is_Possibly_Unaligned_Object (Lhs)
+ and then not Is_Possibly_Unaligned_Object (Rhs)
and then Support_Composite_Compare_On_Target
then
null;
if Is_Tagged_Type (Typl) then
+ -- No need to do anything else compiling under restriction
+ -- No_Dispatching_Calls. During the semantic analysis we
+ -- already notified such violation.
+
+ if Restriction_Active (No_Dispatching_Calls) then
+ return;
+ end if;
+
-- If this is derived from an untagged private type completed
-- with a tagged type, it does not have a full view, so we
-- use the primitive operations of the private type.
end if;
Prim := First_Elmt (Primitive_Operations (Typl));
-
while Present (Prim) loop
exit when Chars (Node (Prim)) = Name_Op_Eq
and then Etype (First_Formal (Node (Prim))) =
(TSS (Root_Type (Typl), TSS_Composite_Equality));
-- Otherwise expand the component by component equality. Note that
- -- we never use block-bit coparisons for records, because of the
+ -- we never use block-bit comparisons for records, because of the
-- problems with gaps. The backend will often be able to recombine
-- the separate comparisons that we generate here.
end if;
end if;
- -- If we still have an equality comparison (i.e. it was not rewritten
- -- in some way), then we can test if result is needed at compile time).
+ -- Test if result is known at compile time
- if Nkind (N) = N_Op_Eq then
- Rewrite_Comparison (N);
+ Rewrite_Comparison (N);
+
+ -- If we still have comparison for Vax_Float, process it
+
+ if Vax_Float (Typl) and then Nkind (N) in N_Op_Compare then
+ Expand_Vax_Comparison (N);
+ return;
end if;
end Expand_N_Op_Eq;
-- Signed integer cases, done using either Integer or Long_Long_Integer.
-- It is not worth having routines for Short_[Short_]Integer, since for
-- most machines it would not help, and it would generate more code that
- -- might need certification in the HI-E case.
+ -- might need certification when a certified run time is required.
-- In the integer cases, we have two routines, one for when overflow
- -- checks are required, and one when they are not required, since
- -- there is a real gain in ommitting checks on many machines.
+ -- checks are required, and one when they are not required, since there
+ -- is a real gain in omitting checks on many machines.
elsif Rtyp = Base_Type (Standard_Long_Long_Integer)
or else (Rtyp = Base_Type (Standard_Long_Integer)
begin
Binary_Op_Validity_Checks (N);
- if Vax_Float (Typ1) then
- Expand_Vax_Comparison (N);
- return;
-
- elsif Is_Array_Type (Typ1) then
+ if Is_Array_Type (Typ1) then
Expand_Array_Comparison (N);
return;
end if;
end if;
Rewrite_Comparison (N);
+
+ -- If we still have comparison, and Vax_Float type, process it
+
+ if Vax_Float (Typ1) and then Nkind (N) in N_Op_Compare then
+ Expand_Vax_Comparison (N);
+ return;
+ end if;
end Expand_N_Op_Ge;
--------------------
begin
Binary_Op_Validity_Checks (N);
- if Vax_Float (Typ1) then
- Expand_Vax_Comparison (N);
- return;
-
- elsif Is_Array_Type (Typ1) then
+ if Is_Array_Type (Typ1) then
Expand_Array_Comparison (N);
return;
end if;
end if;
Rewrite_Comparison (N);
+
+ -- If we still have comparison, and Vax_Float type, process it
+
+ if Vax_Float (Typ1) and then Nkind (N) in N_Op_Compare then
+ Expand_Vax_Comparison (N);
+ return;
+ end if;
end Expand_N_Op_Gt;
--------------------
begin
Binary_Op_Validity_Checks (N);
- if Vax_Float (Typ1) then
- Expand_Vax_Comparison (N);
- return;
-
- elsif Is_Array_Type (Typ1) then
+ if Is_Array_Type (Typ1) then
Expand_Array_Comparison (N);
return;
end if;
end if;
Rewrite_Comparison (N);
+
+ -- If we still have comparison, and Vax_Float type, process it
+
+ if Vax_Float (Typ1) and then Nkind (N) in N_Op_Compare then
+ Expand_Vax_Comparison (N);
+ return;
+ end if;
end Expand_N_Op_Le;
--------------------
begin
Binary_Op_Validity_Checks (N);
- if Vax_Float (Typ1) then
- Expand_Vax_Comparison (N);
- return;
-
- elsif Is_Array_Type (Typ1) then
+ if Is_Array_Type (Typ1) then
Expand_Array_Comparison (N);
return;
end if;
end if;
Rewrite_Comparison (N);
+
+ -- If we still have comparison, and Vax_Float type, process it
+
+ if Vax_Float (Typ1) and then Nkind (N) in N_Op_Compare then
+ Expand_Vax_Comparison (N);
+ return;
+ end if;
end Expand_N_Op_Lt;
-----------------------
Rhi : Uint;
ROK : Boolean;
+ pragma Warnings (Off, Lhi);
+
begin
Binary_Op_Validity_Checks (N);
end if;
end if;
- -- Deal with VAX float case
-
- if Vax_Float (Typ) then
- Expand_Vax_Arith (N);
- return;
- end if;
-
-- Convert x * 2 ** y to Shift_Left (x, y). Note that the fact that
-- Is_Power_Of_2_For_Shift is set means that we know that our left
-- operand is an integer, as required for this to work.
elsif Is_Signed_Integer_Type (Etype (N)) then
Apply_Arithmetic_Overflow_Check (N);
+
+ -- Deal with VAX float case
+
+ elsif Vax_Float (Typ) then
+ Expand_Vax_Arith (N);
+ return;
end if;
end Expand_N_Op_Multiply;
-- Expand_N_Op_Ne --
--------------------
- -- Rewrite node as the negation of an equality operation, and reanalyze.
- -- The equality to be used is defined in the same scope and has the same
- -- signature. It must be set explicitly because in an instance it may not
- -- have the same visibility as in the generic unit.
-
procedure Expand_N_Op_Ne (N : Node_Id) is
- Loc : constant Source_Ptr := Sloc (N);
- Neg : Node_Id;
- Ne : constant Entity_Id := Entity (N);
+ Typ : constant Entity_Id := Etype (Left_Opnd (N));
begin
- Binary_Op_Validity_Checks (N);
+ -- Case of elementary type with standard operator
- Neg :=
- Make_Op_Not (Loc,
- Right_Opnd =>
- Make_Op_Eq (Loc,
- Left_Opnd => Left_Opnd (N),
- Right_Opnd => Right_Opnd (N)));
- Set_Paren_Count (Right_Opnd (Neg), 1);
+ if Is_Elementary_Type (Typ)
+ and then Sloc (Entity (N)) = Standard_Location
+ then
+ Binary_Op_Validity_Checks (N);
- if Scope (Ne) /= Standard_Standard then
- Set_Entity (Right_Opnd (Neg), Corresponding_Equality (Ne));
- end if;
+ -- Boolean types (requiring handling of non-standard case)
- -- For navigation purposes, the inequality is treated as an implicit
- -- reference to the corresponding equality. Preserve the Comes_From_
- -- source flag so that the proper Xref entry is generated.
+ if Is_Boolean_Type (Typ) then
+ Adjust_Condition (Left_Opnd (N));
+ Adjust_Condition (Right_Opnd (N));
+ Set_Etype (N, Standard_Boolean);
+ Adjust_Result_Type (N, Typ);
+ end if;
- Preserve_Comes_From_Source (Neg, N);
- Preserve_Comes_From_Source (Right_Opnd (Neg), N);
- Rewrite (N, Neg);
- Analyze_And_Resolve (N, Standard_Boolean);
+ Rewrite_Comparison (N);
+
+ -- If we still have comparison for Vax_Float, process it
+
+ if Vax_Float (Typ) and then Nkind (N) in N_Op_Compare then
+ Expand_Vax_Comparison (N);
+ return;
+ end if;
+
+ -- For all cases other than elementary types, we rewrite node as the
+ -- negation of an equality operation, and reanalyze. The equality to be
+ -- used is defined in the same scope and has the same signature. This
+ -- signature must be set explicitly since in an instance it may not have
+ -- the same visibility as in the generic unit. This avoids duplicating
+ -- or factoring the complex code for record/array equality tests etc.
+
+ else
+ declare
+ Loc : constant Source_Ptr := Sloc (N);
+ Neg : Node_Id;
+ Ne : constant Entity_Id := Entity (N);
+
+ begin
+ Binary_Op_Validity_Checks (N);
+
+ Neg :=
+ Make_Op_Not (Loc,
+ Right_Opnd =>
+ Make_Op_Eq (Loc,
+ Left_Opnd => Left_Opnd (N),
+ Right_Opnd => Right_Opnd (N)));
+ Set_Paren_Count (Right_Opnd (Neg), 1);
+
+ if Scope (Ne) /= Standard_Standard then
+ Set_Entity (Right_Opnd (Neg), Corresponding_Equality (Ne));
+ end if;
+
+ -- For navigation purposes, the inequality is treated as an
+ -- implicit reference to the corresponding equality. Preserve the
+ -- Comes_From_ source flag so that the proper Xref entry is
+ -- generated.
+
+ Preserve_Comes_From_Source (Neg, N);
+ Preserve_Comes_From_Source (Right_Opnd (Neg), N);
+ Rewrite (N, Neg);
+ Analyze_And_Resolve (N, Standard_Boolean);
+ end;
+ end if;
end Expand_N_Op_Ne;
---------------------
return;
end if;
- -- Case of array operand. If bit packed, handle it in Exp_Pakd
+ -- Case of array operand. If bit packed with a component size of 1,
+ -- handle it in Exp_Pakd if the operand is known to be aligned.
- if Is_Bit_Packed_Array (Typ) and then Component_Size (Typ) = 1 then
+ if Is_Bit_Packed_Array (Typ)
+ and then Component_Size (Typ) = 1
+ and then not Is_Possibly_Unaligned_Object (Right_Opnd (N))
+ then
Expand_Packed_Not (N);
return;
end if;
Convert_To_Actual_Subtype (Opnd);
Arr := Etype (Opnd);
Ensure_Defined (Arr, N);
+ Silly_Boolean_Array_Not_Test (N, Arr);
if Nkind (Parent (N)) = N_Assignment_Statement then
if Safe_In_Place_Array_Op (Name (Parent (N)), N, Empty) then
Build_Boolean_Array_Proc_Call (Parent (N), Opnd, Empty);
return;
- -- Special case the negation of a binary operation.
+ -- Special case the negation of a binary operation
- elsif (Nkind (Opnd) = N_Op_And
- or else Nkind (Opnd) = N_Op_Or
- or else Nkind (Opnd) = N_Op_Xor)
+ elsif Nkind_In (Opnd, N_Op_And, N_Op_Or, N_Op_Xor)
and then Safe_In_Place_Array_Op
- (Name (Parent (N)), Left_Opnd (Opnd), Right_Opnd (Opnd))
+ (Name (Parent (N)), Left_Opnd (Opnd), Right_Opnd (Opnd))
then
Build_Boolean_Array_Proc_Call (Parent (N), Opnd, Empty);
return;
if N = Op1
and then Nkind (Op2) = N_Op_Not
then
- -- (not A) op (not B) can be reduced to a single call.
+ -- (not A) op (not B) can be reduced to a single call
return;
elsif N = Op2
and then Nkind (Parent (N)) = N_Op_Xor
then
- -- A xor (not B) can also be special-cased.
+ -- A xor (not B) can also be special-cased
return;
end if;
Make_Parameter_Specification (Loc,
Defining_Identifier => A,
Parameter_Type => New_Reference_To (Typ, Loc))),
- Subtype_Mark => New_Reference_To (Typ, Loc)),
+ Result_Definition => New_Reference_To (Typ, Loc)),
Declarations => New_List (
Make_Object_Declaration (Loc,
Make_Handled_Sequence_Of_Statements (Loc,
Statements => New_List (
Loop_Statement,
- Make_Return_Statement (Loc,
+ Make_Simple_Return_Statement (Loc,
Expression =>
Make_Identifier (Loc, Chars (B)))))));
Rhi : Uint;
ROK : Boolean;
+ pragma Warnings (Off, Lhi);
+
begin
Binary_Op_Validity_Checks (N);
return;
end if;
- -- Arithemtic overflow checks for signed integer/fixed point types
+ -- Arithmetic overflow checks for signed integer/fixed point types
if Is_Signed_Integer_Type (Typ)
or else Is_Fixed_Point_Type (Typ)
Target_Type : constant Entity_Id := Entity (Subtype_Mark (N));
begin
+ -- Do validity check if validity checking operands
+
+ if Validity_Checks_On
+ and then Validity_Check_Operands
+ then
+ Ensure_Valid (Operand);
+ end if;
+
+ -- Apply possible constraint check
+
Apply_Constraint_Check (Operand, Target_Type, No_Sliding => True);
end Expand_N_Qualified_Expression;
if Do_Discriminant_Check (N) then
- -- Present the discrminant checking function to the backend,
+ -- Present the discriminant checking function to the backend,
-- so that it can inline the call to the function.
Add_Inlined_Body
Generate_Discriminant_Check (N);
end if;
+ -- Ada 2005 (AI-318-02): If the prefix is a call to a build-in-place
+ -- function, then additional actuals must be passed.
+
+ if Ada_Version >= Ada_05
+ and then Is_Build_In_Place_Function_Call (P)
+ then
+ Make_Build_In_Place_Call_In_Anonymous_Context (P);
+ end if;
+
-- Gigi cannot handle unchecked conversions that are the prefix of a
-- selected component with discriminants. This must be checked during
-- expansion, because during analysis the type of the selector is not
if
Denotes_Discriminant
- (Node (Dcon), Check_Protected => True)
+ (Node (Dcon), Check_Concurrent => True)
then
exit Discr_Loop;
elsif Nkind (Parent (N)) = N_Case_Statement
and then Etype (Node (Dcon)) /= Etype (Disc)
then
- -- RBKD is suspicious of the following code. The
- -- call to New_Copy instead of New_Copy_Tree is
- -- suspicious, and the call to Analyze instead
- -- of Analyze_And_Resolve is also suspicious ???
-
- -- Wouldn't it be good enough to do a perfectly
- -- normal Analyze_And_Resolve call using the
- -- subtype of the discriminant here???
-
Rewrite (N,
Make_Qualified_Expression (Loc,
Subtype_Mark =>
New_Occurrence_Of (Etype (Disc), Loc),
Expression =>
- New_Copy (Node (Dcon))));
- Analyze (N);
+ New_Copy_Tree (Node (Dcon))));
+ Analyze_And_Resolve (N, Etype (Disc));
-- In case that comes out as a static expression,
-- reset it (a selected component is never static).
return;
-- Otherwise we can just copy the constraint, but the
- -- result is certainly not static!
-
- -- Again the New_Copy here and the failure to even
- -- to an analyze call is uneasy ???
+ -- result is certainly not static! In some cases the
+ -- discriminant constraint has been analyzed in the
+ -- context of the original subtype indication, but for
+ -- itypes the constraint might not have been analyzed
+ -- yet, and this must be done now.
else
- Rewrite (N, New_Copy (Node (Dcon)));
+ Rewrite (N, New_Copy_Tree (Node (Dcon)));
+ Analyze_And_Resolve (N);
Set_Is_Static_Expression (N, False);
return;
end if;
-- expression, since these are additional cases that do can
-- appear on procedure actuals.
- elsif Nkind (Par) = N_Type_Conversion
- or else Nkind (Par) = N_Parameter_Association
- or else Nkind (Par) = N_Qualified_Expression
+ elsif Nkind_In (Par, N_Type_Conversion,
+ N_Parameter_Association,
+ N_Qualified_Expression)
then
Par := Parent (Par);
Analyze_And_Resolve (Pfx, Ptp);
end if;
+ -- Ada 2005 (AI-318-02): If the prefix is a call to a build-in-place
+ -- function, then additional actuals must be passed.
+
+ if Ada_Version >= Ada_05
+ and then Is_Build_In_Place_Function_Call (Pfx)
+ then
+ Make_Build_In_Place_Call_In_Anonymous_Context (Pfx);
+ end if;
+
-- Range checks are potentially also needed for cases involving
-- a slice indexed by a subtype indication, but Do_Range_Check
-- can currently only be set for expressions ???
and then (not Is_Entity_Name (Pfx)
or else not Index_Checks_Suppressed (Entity (Pfx)))
and then Nkind (Discrete_Range (N)) /= N_Subtype_Indication
+
+ -- Do not enable range check to nodes associated with the frontend
+ -- expansion of the dispatch table. We first check if Ada.Tags is
+ -- already loaded to avoid the addition of an undesired dependence
+ -- on such run-time unit.
+
+ and then
+ (VM_Target /= No_VM
+ or else not
+ (RTU_Loaded (Ada_Tags)
+ and then Nkind (Prefix (N)) = N_Selected_Component
+ and then Present (Entity (Selector_Name (Prefix (N))))
+ and then Entity (Selector_Name (Prefix (N))) =
+ RTE_Record_Component (RE_Prims_Ptr)))
then
Enable_Range_Check (Discrete_Range (N));
end if;
-- situation correctly in the assignment statement expansion).
-- 2. Prefix of indexed component (the slide is optimized away
- -- in this case, see the start of Expand_N_Slice.
+ -- in this case, see the start of Expand_N_Slice.)
-- 3. Object renaming declaration, since we want the name of
-- the slice, not the value.
-- call itself.
-- 5. Prefix of an address attribute (this is an error which
- -- is caught elsewhere, and the expansion would intefere
+ -- is caught elsewhere, and the expansion would interfere
-- with generating the error message).
if not Is_Packed (Typ) then
Cons : List_Id;
begin
- -- Nothing to do if no change of representation
+ -- Nothing else to do if no change of representation
if Same_Representation (Operand_Type, Target_Type) then
return;
-- then we do not trust it to be in range (might be infinite)
declare
- S_Lo : constant Node_Id := Type_Low_Bound (Xtyp);
- S_Hi : constant Node_Id := Type_High_Bound (Xtyp);
+ S_Lo : constant Node_Id := Type_Low_Bound (Xtyp);
+ S_Hi : constant Node_Id := Type_High_Bound (Xtyp);
begin
if (not Is_Floating_Point_Type (Xtyp)
(Subtype_Mark (Conv), New_Occurrence_Of (Btyp, Loc));
Set_Etype (Conv, Btyp);
- -- Enable overflow except in the case of integer to float
- -- conversions, where it is never required, since we can
- -- never have overflow in this case.
+ -- Enable overflow except for case of integer to float conversions,
+ -- where it is never required, since we can never have overflow in
+ -- this case.
if not Is_Integer_Type (Etype (Operand)) then
Enable_Overflow_Check (Conv);
return;
end if;
- -- Deal with Vax floating-point cases
-
- if Vax_Float (Operand_Type) or else Vax_Float (Target_Type) then
- Expand_Vax_Conversion (N);
- return;
- end if;
-
-- Nothing to do if this is the second argument of read. This
-- is a "backwards" conversion that will be handled by the
-- specialized code in attribute processing.
-- Here if we may need to expand conversion
+ -- Do validity check if validity checking operands
+
+ if Validity_Checks_On
+ and then Validity_Check_Operands
+ then
+ Ensure_Valid (Operand);
+ end if;
+
-- Special case of converting from non-standard boolean type
if Is_Boolean_Type (Operand_Type)
if Is_Access_Type (Target_Type) then
- -- Apply an accessibility check if the operand is an
- -- access parameter. Note that other checks may still
- -- need to be applied below (such as tagged type checks).
+ -- Apply an accessibility check when the conversion operand is an
+ -- access parameter (or a renaming thereof), unless conversion was
+ -- expanded from an unchecked or unrestricted access attribute. Note
+ -- that other checks may still need to be applied below (such as
+ -- tagged type checks).
if Is_Entity_Name (Operand)
- and then Ekind (Entity (Operand)) in Formal_Kind
+ and then
+ (Is_Formal (Entity (Operand))
+ or else
+ (Present (Renamed_Object (Entity (Operand)))
+ and then Is_Entity_Name (Renamed_Object (Entity (Operand)))
+ and then Is_Formal
+ (Entity (Renamed_Object (Entity (Operand))))))
and then Ekind (Etype (Operand)) = E_Anonymous_Access_Type
+ and then (Nkind (Original_Node (N)) /= N_Attribute_Reference
+ or else Attribute_Name (Original_Node (N)) = Name_Access)
then
Apply_Accessibility_Check (Operand, Target_Type);
-- Do not do any expansion in the access type case if the
-- parent is a renaming, since this is an error situation
-- which will be caught by Sem_Ch8, and the expansion can
- -- intefere with this error check.
+ -- interfere with this error check.
if Is_Access_Type (Target_Type)
and then Is_Renamed_Object (N)
return;
end if;
- -- Oherwise, proceed with processing tagged conversion
+ -- Otherwise, proceed with processing tagged conversion
declare
Actual_Operand_Type : Entity_Id;
Actual_Target_Type := Target_Type;
end if;
+ -- Ada 2005 (AI-251): Handle interface type conversion
+
+ if Is_Interface (Actual_Operand_Type) then
+ Expand_Interface_Conversion (N, Is_Static => False);
+ return;
+ end if;
+
if Is_Class_Wide_Type (Actual_Operand_Type)
and then Root_Type (Actual_Operand_Type) /= Actual_Target_Type
and then Is_Ancestor
or else
(Is_Fixed_Point_Type (Target_Type) and then Conversion_OK (N)))
then
- -- Special processing required if the conversion is the expression
- -- of a Truncation attribute reference. In this case we replace:
-
- -- ityp (ftyp'Truncation (x))
-
- -- by
-
- -- ityp (x)
-
- -- with the Float_Truncate flag set. This is clearly more efficient.
-
- if Nkind (Operand) = N_Attribute_Reference
- and then Attribute_Name (Operand) = Name_Truncation
- then
- Rewrite (Operand,
- Relocate_Node (First (Expressions (Operand))));
- Set_Float_Truncate (N, True);
- end if;
-
-- One more check here, gcc is still not able to do conversions of
-- this type with proper overflow checking, and so gigi is doing an
-- approximation of what is required by doing floating-point compares
-- with the end-point. But that can lose precision in some cases, and
- -- give a wrong result. Converting the operand to Long_Long_Float is
+ -- give a wrong result. Converting the operand to Universal_Real is
-- helpful, but still does not catch all cases with 64-bit integers
- -- on targets with only 64-bit floats ???
+ -- on targets with only 64-bit floats
+
+ -- The above comment seems obsoleted by Apply_Float_Conversion_Check
+ -- Can this code be removed ???
if Do_Range_Check (Operand) then
Rewrite (Operand,
Make_Type_Conversion (Loc,
Subtype_Mark =>
- New_Occurrence_Of (Standard_Long_Long_Float, Loc),
+ New_Occurrence_Of (Universal_Real, Loc),
Expression =>
Relocate_Node (Operand)));
- Set_Etype (Operand, Standard_Long_Long_Float);
+ Set_Etype (Operand, Universal_Real);
Enable_Range_Check (Operand);
Set_Do_Range_Check (Expression (Operand), False);
end if;
elsif Is_Floating_Point_Type (Target_Type) then
Real_Range_Check;
-
- -- The remaining cases require no front end processing
-
- else
- null;
end if;
-- At this stage, either the conversion node has been transformed
-- only if Conversion_OK is set, i.e. if the fixed-point values
-- are to be treated as integers.
- -- No other conversions should be passed to Gigi.
+ -- No other conversions should be passed to Gigi
+
+ -- Check: are these rules stated in sinfo??? if so, why restate here???
-- The only remaining step is to generate a range check if we still
-- have a type conversion at this stage and Do_Range_Check is set.
end if;
end;
end if;
+
+ -- Final step, if the result is a type conversion involving Vax_Float
+ -- types, then it is subject for further special processing.
+
+ if Nkind (N) = N_Type_Conversion
+ and then (Vax_Float (Operand_Type) or else Vax_Float (Target_Type))
+ then
+ Expand_Vax_Conversion (N);
+ return;
+ end if;
end Expand_N_Type_Conversion;
-----------------------------------
-- flag is set, since then the value may be outside the expected range.
-- This happens in the Normalize_Scalars case.
+ -- We also skip this if either the target or operand type is biased
+ -- because in this case, the unchecked conversion is supposed to
+ -- preserve the bit pattern, not the integer value.
+
if Is_Integer_Type (Target_Type)
+ and then not Has_Biased_Representation (Target_Type)
and then Is_Integer_Type (Operand_Type)
+ and then not Has_Biased_Representation (Operand_Type)
and then Compile_Time_Known_Value (Operand)
and then not Kill_Range_Check (N)
then
then
return Suitable_Element (Next_Entity (C));
+ elsif Is_Interface (Etype (C)) then
+ return Suitable_Element (Next_Entity (C));
+
else
return C;
end if;
declare
New_Lhs : Node_Id;
New_Rhs : Node_Id;
+ Check : Node_Id;
begin
if First_Time then
New_Rhs := New_Copy_Tree (Rhs);
end if;
- Result :=
- Make_And_Then (Loc,
- Left_Opnd => Result,
- Right_Opnd =>
- Expand_Composite_Equality (Nod, Etype (C),
- Lhs =>
- Make_Selected_Component (Loc,
- Prefix => New_Lhs,
- Selector_Name => New_Reference_To (C, Loc)),
- Rhs =>
- Make_Selected_Component (Loc,
- Prefix => New_Rhs,
- Selector_Name => New_Reference_To (C, Loc)),
- Bodies => Bodies));
+ Check :=
+ Expand_Composite_Equality (Nod, Etype (C),
+ Lhs =>
+ Make_Selected_Component (Loc,
+ Prefix => New_Lhs,
+ Selector_Name => New_Reference_To (C, Loc)),
+ Rhs =>
+ Make_Selected_Component (Loc,
+ Prefix => New_Rhs,
+ Selector_Name => New_Reference_To (C, Loc)),
+ Bodies => Bodies);
+
+ -- If some (sub)component is an unchecked_union, the whole
+ -- operation will raise program error.
+
+ if Nkind (Check) = N_Raise_Program_Error then
+ Result := Check;
+ Set_Etype (Result, Standard_Boolean);
+ exit;
+ else
+ Result :=
+ Make_And_Then (Loc,
+ Left_Opnd => Result,
+ Right_Opnd => Check);
+ end if;
end;
C := Suitable_Element (Next_Entity (C));
Loc : constant Source_Ptr := Sloc (N);
Owner : Entity_Id := PtrT;
- -- The entity whose finalisation list must be used to attach the
+ -- The entity whose finalization list must be used to attach the
-- allocated object.
begin
if Ekind (PtrT) = E_Anonymous_Access_Type then
+
+ -- If the context is an access parameter, we need to create a
+ -- non-anonymous access type in order to have a usable final list,
+ -- because there is otherwise no pool to which the allocated object
+ -- can belong. We create both the type and the finalization chain
+ -- here, because freezing an internal type does not create such a
+ -- chain. The Final_Chain that is thus created is shared by the
+ -- access parameter. The access type is tested against the result
+ -- type of the function to exclude allocators whose type is an
+ -- anonymous access result type.
+
if Nkind (Associated_Node_For_Itype (PtrT))
in N_Subprogram_Specification
+ and then
+ PtrT /=
+ Etype (Defining_Unit_Name (Associated_Node_For_Itype (PtrT)))
then
- -- If the context is an access parameter, we need to create
- -- a non-anonymous access type in order to have a usable
- -- final list, because there is otherwise no pool to which
- -- the allocated object can belong. We create both the type
- -- and the finalization chain here, because freezing an
- -- internal type does not create such a chain. The Final_Chain
- -- that is thus created is shared by the access parameter.
-
Owner := Make_Defining_Identifier (Loc, New_Internal_Name ('J'));
Insert_Action (N,
Make_Full_Type_Declaration (Loc,
Build_Final_List (N, Owner);
Set_Associated_Final_Chain (PtrT, Associated_Final_Chain (Owner));
- else
- -- Case of an access discriminant, or (Ada 2005) of
- -- an anonymous access component: find the final list
- -- associated with the scope of the type.
+ -- Ada 2005 (AI-318-02): If the context is a return object
+ -- declaration, then the anonymous return subtype is defined to have
+ -- the same accessibility level as that of the function's result
+ -- subtype, which means that we want the scope where the function is
+ -- declared.
+
+ elsif Nkind (Associated_Node_For_Itype (PtrT)) = N_Object_Declaration
+ and then Ekind (Scope (PtrT)) = E_Return_Statement
+ then
+ Owner := Scope (Return_Applies_To (Scope (PtrT)));
+ -- Case of an access discriminant, or (Ada 2005), of an anonymous
+ -- access component or anonymous access function result: find the
+ -- final list associated with the scope of the type. (In the
+ -- anonymous access component kind, a list controller will have
+ -- been allocated when freezing the record type, and PtrT has an
+ -- Associated_Final_Chain attribute designating it.)
+
+ elsif No (Associated_Final_Chain (PtrT)) then
Owner := Scope (PtrT);
end if;
end if;
-- Start of processing for Has_Inferable_Discriminants
begin
- -- For identifiers and indexed components, it is sufficent to have a
+ -- For identifiers and indexed components, it is sufficient to have a
-- constrained Unchecked_Union nominal subtype.
- if Nkind (N) = N_Identifier
- or else
- Nkind (N) = N_Indexed_Component
- then
+ if Nkind_In (N, N_Identifier, N_Indexed_Component) then
return Is_Unchecked_Union (Base_Type (Etype (N)))
and then
Is_Constrained (Etype (N));
-- type elem is (<>);
-- type index is (<>);
-- type a is array (index range <>) of elem;
- --
+
-- function Gnnn (X : a; Y: a) return boolean is
-- J : index := Y'first;
- --
+
-- begin
-- if X'length = 0 then
-- return false;
- --
+
-- elsif Y'length = 0 then
-- return true;
- --
+
-- else
-- for I in X'range loop
-- if X (I) = Y (J) then
-- else
-- J := index'succ (J);
-- end if;
- --
+
-- else
-- return X (I) > Y (J);
-- end if;
-- end loop;
- --
+
-- return X'length > Y'length;
-- end if;
-- end Gnnn;
Then_Statements => New_List (Inner_If),
Else_Statements => New_List (
- Make_Return_Statement (Loc,
+ Make_Simple_Return_Statement (Loc,
Expression =>
Make_Op_Gt (Loc,
Left_Opnd =>
Then_Statements =>
New_List (
- Make_Return_Statement (Loc,
+ Make_Simple_Return_Statement (Loc,
Expression => New_Reference_To (Standard_False, Loc))),
Elsif_Parts => New_List (
Then_Statements =>
New_List (
- Make_Return_Statement (Loc,
+ Make_Simple_Return_Statement (Loc,
Expression => New_Reference_To (Standard_True, Loc))))),
Else_Statements => New_List (
Loop_Statement,
- Make_Return_Statement (Loc,
+ Make_Simple_Return_Statement (Loc,
Expression => Final_Expr)));
-- (X : a; Y: a)
Make_Function_Specification (Loc,
Defining_Unit_Name => Func_Name,
Parameter_Specifications => Formals,
- Subtype_Mark => New_Reference_To (Standard_Boolean, Loc)),
+ Result_Definition => New_Reference_To (Standard_Boolean, Loc)),
Declarations => New_List (
Make_Object_Declaration (Loc,
Statements => New_List (If_Stat)));
return Func_Body;
-
end Make_Array_Comparison_Op;
---------------------------
Make_Function_Specification (Loc,
Defining_Unit_Name => Func_Name,
Parameter_Specifications => Formals,
- Subtype_Mark => New_Reference_To (Typ, Loc)),
+ Result_Definition => New_Reference_To (Typ, Loc)),
Declarations => New_List (
Make_Object_Declaration (Loc,
Make_Handled_Sequence_Of_Statements (Loc,
Statements => New_List (
Loop_Statement,
- Make_Return_Statement (Loc,
+ Make_Simple_Return_Statement (Loc,
Expression => New_Reference_To (C, Loc)))));
return Func_Body;
------------------------
procedure Rewrite_Comparison (N : Node_Id) is
- Typ : constant Entity_Id := Etype (N);
- Op1 : constant Node_Id := Left_Opnd (N);
- Op2 : constant Node_Id := Right_Opnd (N);
+ begin
+ if Nkind (N) = N_Type_Conversion then
+ Rewrite_Comparison (Expression (N));
+ return;
- Res : constant Compare_Result := Compile_Time_Compare (Op1, Op2);
- -- Res indicates if compare outcome can be determined at compile time
+ elsif Nkind (N) not in N_Op_Compare then
+ return;
+ end if;
- True_Result : Boolean;
- False_Result : Boolean;
+ declare
+ Typ : constant Entity_Id := Etype (N);
+ Op1 : constant Node_Id := Left_Opnd (N);
+ Op2 : constant Node_Id := Right_Opnd (N);
- begin
- case N_Op_Compare (Nkind (N)) is
- when N_Op_Eq =>
- True_Result := Res = EQ;
- False_Result := Res = LT or else Res = GT or else Res = NE;
-
- when N_Op_Ge =>
- True_Result := Res in Compare_GE;
- False_Result := Res = LT;
-
- when N_Op_Gt =>
- True_Result := Res = GT;
- False_Result := Res in Compare_LE;
-
- when N_Op_Lt =>
- True_Result := Res = LT;
- False_Result := Res in Compare_GE;
-
- when N_Op_Le =>
- True_Result := Res in Compare_LE;
- False_Result := Res = GT;
-
- when N_Op_Ne =>
- True_Result := Res = NE;
- False_Result := Res = LT or else Res = GT or else Res = EQ;
- end case;
+ Res : constant Compare_Result := Compile_Time_Compare (Op1, Op2);
+ -- Res indicates if compare outcome can be compile time determined
- if True_Result then
- Rewrite (N,
- Convert_To (Typ, New_Occurrence_Of (Standard_True, Sloc (N))));
- Analyze_And_Resolve (N, Typ);
- Warn_On_Known_Condition (N);
+ True_Result : Boolean;
+ False_Result : Boolean;
- elsif False_Result then
- Rewrite (N,
- Convert_To (Typ, New_Occurrence_Of (Standard_False, Sloc (N))));
- Analyze_And_Resolve (N, Typ);
- Warn_On_Known_Condition (N);
- end if;
+ begin
+ case N_Op_Compare (Nkind (N)) is
+ when N_Op_Eq =>
+ True_Result := Res = EQ;
+ False_Result := Res = LT or else Res = GT or else Res = NE;
+
+ when N_Op_Ge =>
+ True_Result := Res in Compare_GE;
+ False_Result := Res = LT;
+
+ if Res = LE
+ and then Constant_Condition_Warnings
+ and then Comes_From_Source (Original_Node (N))
+ and then Nkind (Original_Node (N)) = N_Op_Ge
+ and then not In_Instance
+ and then Is_Integer_Type (Etype (Left_Opnd (N)))
+ and then not Has_Warnings_Off (Etype (Left_Opnd (N)))
+ then
+ Error_Msg_N
+ ("can never be greater than, could replace by ""'=""?", N);
+ end if;
+
+ when N_Op_Gt =>
+ True_Result := Res = GT;
+ False_Result := Res in Compare_LE;
+
+ when N_Op_Lt =>
+ True_Result := Res = LT;
+ False_Result := Res in Compare_GE;
+
+ when N_Op_Le =>
+ True_Result := Res in Compare_LE;
+ False_Result := Res = GT;
+
+ if Res = GE
+ and then Constant_Condition_Warnings
+ and then Comes_From_Source (Original_Node (N))
+ and then Nkind (Original_Node (N)) = N_Op_Le
+ and then not In_Instance
+ and then Is_Integer_Type (Etype (Left_Opnd (N)))
+ and then not Has_Warnings_Off (Etype (Left_Opnd (N)))
+ then
+ Error_Msg_N
+ ("can never be less than, could replace by ""'=""?", N);
+ end if;
+
+ when N_Op_Ne =>
+ True_Result := Res = NE or else Res = GT or else Res = LT;
+ False_Result := Res = EQ;
+ end case;
+
+ if True_Result then
+ Rewrite (N,
+ Convert_To (Typ,
+ New_Occurrence_Of (Standard_True, Sloc (N))));
+ Analyze_And_Resolve (N, Typ);
+ Warn_On_Known_Condition (N);
+
+ elsif False_Result then
+ Rewrite (N,
+ Convert_To (Typ,
+ New_Occurrence_Of (Standard_False, Sloc (N))));
+ Analyze_And_Resolve (N, Typ);
+ Warn_On_Known_Condition (N);
+ end if;
+ end;
end Rewrite_Comparison;
----------------------------
-- is safe. The operand can be empty in the case of negation.
function Is_Unaliased (N : Node_Id) return Boolean;
- -- Check that N is a stand-alone entity.
+ -- Check that N is a stand-alone entity
------------------
-- Is_Unaliased --
elsif Is_Entity_Name (Op) then
return Is_Unaliased (Op);
- elsif Nkind (Op) = N_Indexed_Component
- or else Nkind (Op) = N_Selected_Component
- then
+ elsif Nkind_In (Op, N_Indexed_Component, N_Selected_Component) then
return Is_Unaliased (Prefix (Op));
elsif Nkind (Op) = N_Slice then
if Component_Size (Etype (Lhs)) /= System_Storage_Unit then
return False;
- -- Cannot do in place stuff on Java_VM since cannot pass addresses
+ -- Cannot do in place stuff on VM_Target since cannot pass addresses
- elsif Java_VM then
+ elsif VM_Target /= No_VM then
return False;
-- Cannot do in place stuff if non-standard Boolean representation
-- is usually implemented by looking in the ancestor tables contained in
-- the dispatch table pointed by Left_Expr.Tag for Typ'Tag
+ -- Ada 2005 (AI-251): If it is a class-wide interface type we use the RT
+ -- function IW_Membership which is usually implemented by looking in the
+ -- table of abstract interface types plus the ancestor table contained in
+ -- the dispatch table pointed by Left_Expr.Tag for Typ'Tag
+
function Tagged_Membership (N : Node_Id) return Node_Id is
Left : constant Node_Id := Left_Opnd (N);
Right : constant Node_Id := Right_Opnd (N);
Obj_Tag :=
Make_Selected_Component (Loc,
Prefix => Relocate_Node (Left),
- Selector_Name => New_Reference_To (Tag_Component (Left_Type), Loc));
+ Selector_Name =>
+ New_Reference_To (First_Tag_Component (Left_Type), Loc));
if Is_Class_Wide_Type (Right_Type) then
- return
- Make_DT_Access_Action (Left_Type,
- Action => CW_Membership,
- Args => New_List (
- Obj_Tag,
- New_Reference_To (
- Access_Disp_Table (Root_Type (Right_Type)), Loc)));
+
+ -- No need to issue a run-time check if we statically know that the
+ -- result of this membership test is always true. For example,
+ -- considering the following declarations:
+
+ -- type Iface is interface;
+ -- type T is tagged null record;
+ -- type DT is new T and Iface with null record;
+
+ -- Obj1 : T;
+ -- Obj2 : DT;
+
+ -- These membership tests are always true:
+
+ -- Obj1 in T'Class
+ -- Obj2 in T'Class;
+ -- Obj2 in Iface'Class;
+
+ -- We do not need to handle cases where the membership is illegal.
+ -- For example:
+
+ -- Obj1 in DT'Class; -- Compile time error
+ -- Obj1 in Iface'Class; -- Compile time error
+
+ if not Is_Class_Wide_Type (Left_Type)
+ and then (Is_Parent (Etype (Right_Type), Left_Type)
+ or else (Is_Interface (Etype (Right_Type))
+ and then Interface_Present_In_Ancestor
+ (Typ => Left_Type,
+ Iface => Etype (Right_Type))))
+ then
+ return New_Reference_To (Standard_True, Loc);
+ end if;
+
+ -- Ada 2005 (AI-251): Class-wide applied to interfaces
+
+ if Is_Interface (Etype (Class_Wide_Type (Right_Type)))
+
+ -- Support to: "Iface_CW_Typ in Typ'Class"
+
+ or else Is_Interface (Left_Type)
+ then
+ -- Issue error if IW_Membership operation not available in a
+ -- configurable run time setting.
+
+ if not RTE_Available (RE_IW_Membership) then
+ Error_Msg_CRT
+ ("dynamic membership test on interface types", N);
+ return Empty;
+ end if;
+
+ return
+ Make_Function_Call (Loc,
+ Name => New_Occurrence_Of (RTE (RE_IW_Membership), Loc),
+ Parameter_Associations => New_List (
+ Make_Attribute_Reference (Loc,
+ Prefix => Obj_Tag,
+ Attribute_Name => Name_Address),
+ New_Reference_To (
+ Node (First_Elmt
+ (Access_Disp_Table (Root_Type (Right_Type)))),
+ Loc)));
+
+ -- Ada 95: Normal case
+
+ else
+ return
+ Build_CW_Membership (Loc,
+ Obj_Tag_Node => Obj_Tag,
+ Typ_Tag_Node =>
+ New_Reference_To (
+ Node (First_Elmt
+ (Access_Disp_Table (Root_Type (Right_Type)))),
+ Loc));
+ end if;
+
+ -- Right_Type is not a class-wide type
+
else
- return
- Make_Op_Eq (Loc,
- Left_Opnd => Obj_Tag,
- Right_Opnd =>
- New_Reference_To (Access_Disp_Table (Right_Type), Loc));
- end if;
+ -- No need to check the tag of the object if Right_Typ is abstract
+
+ if Is_Abstract_Type (Right_Type) then
+ return New_Reference_To (Standard_False, Loc);
+ else
+ return
+ Make_Op_Eq (Loc,
+ Left_Opnd => Obj_Tag,
+ Right_Opnd =>
+ New_Reference_To
+ (Node (First_Elmt (Access_Disp_Table (Right_Type))), Loc));
+ end if;
+ end if;
end Tagged_Membership;
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