-- --
-- B o d y --
-- --
--- $Revision$
--- --
--- Copyright (C) 1992-2001, Free Software Foundation, Inc. --
+-- Copyright (C) 1992-2007, 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. --
--- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
+-- 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;
with Sem_Type; use Sem_Type;
with Sem_Util; use Sem_Util;
+with Sem_Warn; use Sem_Warn;
with Sinfo; use Sinfo;
-with Sinfo.CN; use Sinfo.CN;
with Snames; use Snames;
with Stand; use Stand;
+with Targparm; use Targparm;
with Tbuild; use Tbuild;
with Ttypes; use Ttypes;
with Uintp; use Uintp;
package body Exp_Ch4 is
- ------------------------
- -- Local Subprograms --
- ------------------------
+ -----------------------
+ -- Local Subprograms --
+ -----------------------
procedure Binary_Op_Validity_Checks (N : Node_Id);
pragma Inline (Binary_Op_Validity_Checks);
-- Performs validity checks for a binary operator
+ procedure Build_Boolean_Array_Proc_Call
+ (N : Node_Id;
+ Op1 : Node_Id;
+ Op2 : Node_Id);
+ -- 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.
+
procedure Expand_Array_Comparison (N : Node_Id);
-- This routine handles expansion of the comparison operators (N_Op_Lt,
-- N_Op_Le, N_Op_Gt, N_Op_Ge) when operating on an array type. The basic
-- code for these operators is similar, differing only in the details of
- -- the actual comparison call that is made.
+ -- the actual comparison call that is made. Special processing (call a
+ -- run-time routine)
function Expand_Array_Equality
(Nod : Node_Id;
- Typ : Entity_Id;
- A_Typ : Entity_Id;
Lhs : Node_Id;
Rhs : Node_Id;
- Bodies : List_Id)
- return Node_Id;
+ Bodies : List_Id;
+ Typ : Entity_Id) return Node_Id;
-- Expand an array equality into a call to a function implementing this
-- equality, and a call to it. Loc is the location for the generated
- -- nodes. Typ is the type of the array, and Lhs, Rhs are the array
- -- expressions to be compared. A_Typ is the type of the arguments,
- -- which may be a private type, in which case Typ is its full view.
+ -- nodes. Lhs and Rhs are the array expressions to be compared.
-- Bodies is a list on which to attach bodies of local functions that
- -- are created in the process. This is the responsability of the
+ -- are created in the process. It is the responsibility of the
-- caller to insert those bodies at the right place. Nod provides
- -- the Sloc value for the generated code.
+ -- the Sloc value for the generated code. Normally the types used
+ -- for the generated equality routine are taken from Lhs and Rhs.
+ -- However, in some situations of generated code, the Etype fields
+ -- of Lhs and Rhs are not set yet. In such cases, Typ supplies the
+ -- type to be used for the formal parameters.
procedure Expand_Boolean_Operator (N : Node_Id);
-- Common expansion processing for Boolean operators (And, Or, Xor)
Typ : Entity_Id;
Lhs : Node_Id;
Rhs : Node_Id;
- Bodies : List_Id)
- return Node_Id;
+ Bodies : List_Id) return Node_Id;
-- 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
-- to insert those bodies at the right place. Nod provides the Sloc
- -- value for generated code.
+ -- 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_Other (Cnode : Node_Id; Opnds : List_Id);
-- This routine handles expansion of concatenation operations, where
-- purpose of this routine is to find the real type by looking up
-- the tree. We also determine if the operation must be rounded.
+ function Get_Allocator_Final_List
+ (N : Node_Id;
+ T : Entity_Id;
+ PtrT : Entity_Id) return Entity_Id;
+ -- If the designated type is controlled, build final_list expression
+ -- for created object. If context is an access parameter, create a
+ -- local access type to have a usable finalization list.
+
+ function Has_Inferable_Discriminants (N : Node_Id) return Boolean;
+ -- Ada 2005 (AI-216): A view of an Unchecked_Union object has inferable
+ -- discriminants if it has a constrained nominal type, unless the object
+ -- is a component of an enclosing Unchecked_Union object that is subject
+ -- to a per-object constraint and the enclosing object lacks inferable
+ -- discriminants.
+ --
+ -- An expression of an Unchecked_Union type has inferable discriminants
+ -- if it is either a name of an object with inferable discriminants or a
+ -- qualified expression whose subtype mark denotes a constrained subtype.
+
procedure Insert_Dereference_Action (N : Node_Id);
- -- N is an expression whose type is an access. When the type is derived
- -- from Checked_Pool, expands a call to the primitive 'dereference'.
+ -- N is an expression whose type is an access. When the type of the
+ -- associated storage pool is derived from Checked_Pool, generate a
+ -- call to the 'Dereference' primitive operation.
function Make_Array_Comparison_Op
- (Typ : Entity_Id;
- Nod : Node_Id)
- return Node_Id;
+ (Typ : Entity_Id;
+ Nod : Node_Id) return Node_Id;
-- Comparisons between arrays are expanded in line. This function
-- produces the body of the implementation of (a > b), where a and b
-- are one-dimensional arrays of some discrete type. The original
-- Nod provides the Sloc value for the generated code.
function Make_Boolean_Array_Op
- (Typ : Entity_Id;
- N : Node_Id)
- return Node_Id;
+ (Typ : Entity_Id;
+ N : Node_Id) return Node_Id;
-- Boolean operations on boolean arrays are expanded in line. This
-- function produce the body for the node N, which is (a and b),
-- (a or b), or (a xor b). It is used only the normal case and not
-- 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.
-- Deals with a second operand being (or not) a class-wide type.
+ function Safe_In_Place_Array_Op
+ (Lhs : Node_Id;
+ Op1 : Node_Id;
+ Op2 : Node_Id) return Boolean;
+ -- In the context of an assignment, where the right-hand side is a
+ -- boolean operation on arrays, check whether operation can be performed
+ -- in place.
+
procedure Unary_Op_Validity_Checks (N : Node_Id);
pragma Inline (Unary_Op_Validity_Checks);
-- Performs validity checks for a unary operator
end if;
end Binary_Op_Validity_Checks;
+ ------------------------------------
+ -- Build_Boolean_Array_Proc_Call --
+ ------------------------------------
+
+ procedure Build_Boolean_Array_Proc_Call
+ (N : Node_Id;
+ Op1 : Node_Id;
+ Op2 : Node_Id)
+ is
+ Loc : constant Source_Ptr := Sloc (N);
+ Kind : constant Node_Kind := Nkind (Expression (N));
+ Target : constant Node_Id :=
+ Make_Attribute_Reference (Loc,
+ Prefix => Name (N),
+ Attribute_Name => Name_Address);
+
+ Arg1 : constant Node_Id := Op1;
+ Arg2 : Node_Id := Op2;
+ Call_Node : Node_Id;
+ Proc_Name : Entity_Id;
+
+ begin
+ if Kind = N_Op_Not then
+ if Nkind (Op1) in N_Binary_Op then
+
+ -- Use negated version of the binary operators
+
+ if Nkind (Op1) = N_Op_And then
+ Proc_Name := RTE (RE_Vector_Nand);
+
+ elsif Nkind (Op1) = N_Op_Or then
+ Proc_Name := RTE (RE_Vector_Nor);
+
+ else pragma Assert (Nkind (Op1) = N_Op_Xor);
+ Proc_Name := RTE (RE_Vector_Xor);
+ end if;
+
+ Call_Node :=
+ Make_Procedure_Call_Statement (Loc,
+ Name => New_Occurrence_Of (Proc_Name, Loc),
+
+ Parameter_Associations => New_List (
+ Target,
+ Make_Attribute_Reference (Loc,
+ Prefix => Left_Opnd (Op1),
+ Attribute_Name => Name_Address),
+
+ Make_Attribute_Reference (Loc,
+ Prefix => Right_Opnd (Op1),
+ Attribute_Name => Name_Address),
+
+ Make_Attribute_Reference (Loc,
+ Prefix => Left_Opnd (Op1),
+ Attribute_Name => Name_Length)));
+
+ else
+ Proc_Name := RTE (RE_Vector_Not);
+
+ Call_Node :=
+ Make_Procedure_Call_Statement (Loc,
+ Name => New_Occurrence_Of (Proc_Name, Loc),
+ Parameter_Associations => New_List (
+ Target,
+
+ Make_Attribute_Reference (Loc,
+ Prefix => Op1,
+ Attribute_Name => Name_Address),
+
+ Make_Attribute_Reference (Loc,
+ Prefix => Op1,
+ Attribute_Name => Name_Length)));
+ end if;
+
+ else
+ -- We use the following equivalences:
+
+ -- (not X) or (not Y) = not (X and Y) = Nand (X, Y)
+ -- (not X) and (not Y) = not (X or Y) = Nor (X, Y)
+ -- (not X) xor (not Y) = X xor Y
+ -- X xor (not Y) = not (X xor Y) = Nxor (X, Y)
+
+ if Nkind (Op1) = N_Op_Not then
+ if Kind = N_Op_And then
+ Proc_Name := RTE (RE_Vector_Nor);
+
+ elsif Kind = N_Op_Or then
+ Proc_Name := RTE (RE_Vector_Nand);
+
+ else
+ Proc_Name := RTE (RE_Vector_Xor);
+ end if;
+
+ else
+ if Kind = N_Op_And then
+ Proc_Name := RTE (RE_Vector_And);
+
+ elsif Kind = N_Op_Or then
+ Proc_Name := RTE (RE_Vector_Or);
+
+ elsif Nkind (Op2) = N_Op_Not then
+ Proc_Name := RTE (RE_Vector_Nxor);
+ Arg2 := Right_Opnd (Op2);
+
+ else
+ Proc_Name := RTE (RE_Vector_Xor);
+ end if;
+ end if;
+
+ Call_Node :=
+ Make_Procedure_Call_Statement (Loc,
+ Name => New_Occurrence_Of (Proc_Name, Loc),
+ Parameter_Associations => New_List (
+ Target,
+ Make_Attribute_Reference (Loc,
+ Prefix => Arg1,
+ Attribute_Name => Name_Address),
+ Make_Attribute_Reference (Loc,
+ Prefix => Arg2,
+ Attribute_Name => Name_Address),
+ Make_Attribute_Reference (Loc,
+ Prefix => Op1,
+ Attribute_Name => Name_Length)));
+ end if;
+
+ Rewrite (N, Call_Node);
+ Analyze (N);
+
+ exception
+ when RE_Not_Available =>
+ 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 Ifac_2e'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));
+ 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 funtions
+ -- 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;
+ -- <CTRL> Adjust (Finalizable (Temp.all));
+ -- <CTRL> Attach_To_Final_List (Finalizable (Temp.all));
+
+ -- 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;
+
+ Temp :=
+ Make_Defining_Identifier (Loc, New_Internal_Name ('P'));
+
+ -- For a class wide allocation generate the following code:
+
+ -- type Equiv_Record is record ... end record;
+ -- implicit subtype CW is <Class_Wide_Subytpe>;
+ -- temp : PtrT := new CW'(CW!(expr));
+
+ if Is_Class_Wide_Type (T) then
+ Expand_Subtype_From_Expr (Empty, T, 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;
+
+ -- 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_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 (PtrT, Loc),
+ Expression => Node));
+ end if;
+
+ -- 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
+ 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 proceessing
+ -- 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;
+
+ Apply_Accessibility_Check (Temp);
+
+ -- Generate the tag assignment
+
+ -- 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 => TagR,
+ Selector_Name =>
+ New_Reference_To (First_Tag_Component (TagT), Loc)),
+
+ Expression =>
+ Unchecked_Convert_To (RTE (RE_Tag),
+ 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);
+ end if;
+
+ if Controlled_Type (DesigT)
+ and then Controlled_Type (T)
+ then
+ declare
+ Attach : Node_Id;
+ Apool : constant Entity_Id :=
+ Associated_Storage_Pool (PtrT);
+
+ begin
+ -- If it is an allocation on the secondary stack
+ -- (i.e. a value returned from a function), the object
+ -- is attached on the caller side as soon as the call
+ -- is completed (see Expand_Ctrl_Function_Call)
+
+ if Is_RTE (Apool, RE_SS_Pool) then
+ declare
+ F : constant Entity_Id :=
+ Make_Defining_Identifier (Loc,
+ New_Internal_Name ('F'));
+ begin
+ Insert_Action (N,
+ Make_Object_Declaration (Loc,
+ Defining_Identifier => F,
+ Object_Definition => New_Reference_To (RTE
+ (RE_Finalizable_Ptr), Loc)));
+
+ Flist := New_Reference_To (F, Loc);
+ Attach := Make_Integer_Literal (Loc, 1);
+ end;
+
+ -- Normal case, not a secondary stack allocation
+
+ else
+ 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);
+ else
+ Flist := Find_Final_List (PtrT);
+ end if;
+
+ Attach := Make_Integer_Literal (Loc, 2);
+ end if;
+
+ -- 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 =>
+
+ -- An unchecked conversion is needed in the
+ -- classwide case because the designated type
+ -- can be an ancestor of the subtype mark of
+ -- the allocator.
+
+ Unchecked_Convert_To (T,
+ Make_Explicit_Dereference (Loc,
+ Prefix => New_Reference_To (Temp, Loc))),
+
+ Typ => T,
+ Flist_Ref => Flist,
+ 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'));
+ 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_No_Initialization (Expression (Tmp_Node));
+ Insert_Action (N, Tmp_Node);
+ Convert_Aggr_In_Allocator (N, Tmp_Node, Exp);
+ Rewrite (N, New_Reference_To (Temp, Loc));
+ Analyze_And_Resolve (N, 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 (DesigT),
+ No_Sliding => True);
+
+ if Nkind (Expression (Exp)) = N_Raise_Constraint_Error then
+
+ -- Propagate constraint_error to enclosing allocator
+
+ Rewrite (Exp, New_Copy (Expression (Exp)));
+ end if;
+ else
+ -- First check against the type of the qualified expression
+ --
+ -- NOTE: The commented call should be correct, but for
+ -- some reason causes the compiler to bomb (sigsegv) on
+ -- ACVC test c34007g, so for now we just perform the old
+ -- (incorrect) test against the designated subtype with
+ -- no sliding in the else part of the if statement below.
+ -- ???
+ --
+ -- Apply_Constraint_Check (Exp, T, No_Sliding => True);
+
+ -- A check is also needed in cases where the designated
+ -- subtype is constrained and differs from the subtype
+ -- given in the qualified expression. Note that the check
+ -- on the qualified expression does not allow sliding,
+ -- but this check does (a relaxation from Ada 83).
+
+ if Is_Constrained (DesigT)
+ and then not Subtypes_Statically_Match
+ (T, DesigT)
+ then
+ Apply_Constraint_Check
+ (Exp, DesigT, No_Sliding => False);
+
+ -- The nonsliding check should really be performed
+ -- (unconditionally) against the subtype of the
+ -- qualified expression, but that causes a problem
+ -- with c34007g (see above), so for now we retain this.
+
+ else
+ Apply_Constraint_Check
+ (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 funtions
+ -- 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;
+
+ exception
+ when RE_Not_Available =>
+ return;
+ end Expand_Allocator_Expression;
+
-----------------------------
-- Expand_Array_Comparison --
-----------------------------
- -- Expansion is only required in the case of array types. The form of
- -- the expansion is:
+ -- Expansion is only required in the case of array types. For the
+ -- unpacked case, an appropriate runtime routine is called. For
+ -- packed cases, and also in some other cases where a runtime
+ -- routine cannot be called, the form of the expansion is:
-- [body for greater_nn; boolean_expression]
Op1 : Node_Id := Left_Opnd (N);
Op2 : Node_Id := Right_Opnd (N);
Typ1 : constant Entity_Id := Base_Type (Etype (Op1));
+ Ctyp : constant Entity_Id := Component_Type (Typ1);
Expr : Node_Id;
Func_Body : Node_Id;
Func_Name : Entity_Id;
+ Comp : RE_Id;
+
+ Byte_Addressable : constant Boolean := System_Storage_Unit = Byte'Size;
+ -- True for byte addressable target
+
+ function Length_Less_Than_4 (Opnd : Node_Id) return Boolean;
+ -- Returns True if the length of the given operand is known to be
+ -- less than 4. Returns False if this length is known to be four
+ -- or greater or is not known at compile time.
+
+ ------------------------
+ -- Length_Less_Than_4 --
+ ------------------------
+
+ function Length_Less_Than_4 (Opnd : Node_Id) return Boolean is
+ Otyp : constant Entity_Id := Etype (Opnd);
+
+ begin
+ if Ekind (Otyp) = E_String_Literal_Subtype then
+ return String_Literal_Length (Otyp) < 4;
+
+ else
+ declare
+ Ityp : constant Entity_Id := Etype (First_Index (Otyp));
+ Lo : constant Node_Id := Type_Low_Bound (Ityp);
+ Hi : constant Node_Id := Type_High_Bound (Ityp);
+ Lov : Uint;
+ Hiv : Uint;
+
+ begin
+ if Compile_Time_Known_Value (Lo) then
+ Lov := Expr_Value (Lo);
+ else
+ return False;
+ end if;
+
+ if Compile_Time_Known_Value (Hi) then
+ Hiv := Expr_Value (Hi);
+ else
+ return False;
+ end if;
+
+ return Hiv < Lov + 3;
+ end;
+ end if;
+ end Length_Less_Than_4;
+
+ -- Start of processing for Expand_Array_Comparison
+
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/CIL, since they do not support direct
+ -- addressing of array components.
+
+ if not Is_Bit_Packed_Array (Typ1)
+ and then Byte_Addressable
+ and then VM_Target = No_VM
+ then
+ -- The call we generate is:
+
+ -- Compare_Array_xn[_Unaligned]
+ -- (left'address, right'address, left'length, right'length) <op> 0
+
+ -- x = U for unsigned, S for signed
+ -- n = 8,16,32,64 for component size
+ -- Add _Unaligned if length < 4 and component size is 8.
+ -- <op> is the standard comparison operator
+
+ if Component_Size (Typ1) = 8 then
+ if Length_Less_Than_4 (Op1)
+ or else
+ Length_Less_Than_4 (Op2)
+ then
+ if Is_Unsigned_Type (Ctyp) then
+ Comp := RE_Compare_Array_U8_Unaligned;
+ else
+ Comp := RE_Compare_Array_S8_Unaligned;
+ end if;
+
+ else
+ if Is_Unsigned_Type (Ctyp) then
+ Comp := RE_Compare_Array_U8;
+ else
+ Comp := RE_Compare_Array_S8;
+ end if;
+ end if;
+
+ elsif Component_Size (Typ1) = 16 then
+ if Is_Unsigned_Type (Ctyp) then
+ Comp := RE_Compare_Array_U16;
+ else
+ Comp := RE_Compare_Array_S16;
+ end if;
+
+ elsif Component_Size (Typ1) = 32 then
+ if Is_Unsigned_Type (Ctyp) then
+ Comp := RE_Compare_Array_U32;
+ else
+ Comp := RE_Compare_Array_S32;
+ end if;
+
+ else pragma Assert (Component_Size (Typ1) = 64);
+ if Is_Unsigned_Type (Ctyp) then
+ Comp := RE_Compare_Array_U64;
+ else
+ Comp := RE_Compare_Array_S64;
+ end if;
+ end if;
+
+ Remove_Side_Effects (Op1, Name_Req => True);
+ Remove_Side_Effects (Op2, Name_Req => True);
+
+ Rewrite (Op1,
+ Make_Function_Call (Sloc (Op1),
+ Name => New_Occurrence_Of (RTE (Comp), Loc),
+
+ Parameter_Associations => New_List (
+ Make_Attribute_Reference (Loc,
+ Prefix => Relocate_Node (Op1),
+ Attribute_Name => Name_Address),
+
+ Make_Attribute_Reference (Loc,
+ Prefix => Relocate_Node (Op2),
+ Attribute_Name => Name_Address),
+
+ Make_Attribute_Reference (Loc,
+ Prefix => Relocate_Node (Op1),
+ Attribute_Name => Name_Length),
+
+ Make_Attribute_Reference (Loc,
+ Prefix => Relocate_Node (Op2),
+ Attribute_Name => Name_Length))));
+
+ Rewrite (Op2,
+ Make_Integer_Literal (Sloc (Op2),
+ Intval => Uint_0));
+
+ Analyze_And_Resolve (Op1, Standard_Integer);
+ Analyze_And_Resolve (Op2, Standard_Integer);
+ return;
+ end if;
+
+ -- Cases where we cannot make runtime call
+
-- For (a <= b) we convert to not (a > b)
if Chars (N) = Name_Op_Le then
Rewrite (N, Expr);
Analyze_And_Resolve (N, Standard_Boolean);
+ exception
+ when RE_Not_Available =>
+ return;
end Expand_Array_Comparison;
---------------------------
-- Expand an equality function for multi-dimensional arrays. Here is
-- an example of such a function for Nb_Dimension = 2
- -- function Enn (A : arr; B : arr) return boolean is
- -- J1 : integer;
- -- J2 : integer;
- --
+ -- function Enn (A : atyp; B : btyp) return boolean is
-- begin
- -- if A'length (1) /= B'length (1) then
- -- return false;
- -- else
- -- J1 := B'first (1);
- -- for I1 in A'first (1) .. A'last (1) loop
- -- if A'length (2) /= B'length (2) then
- -- return false;
- -- else
- -- J2 := B'first (2);
- -- for I2 in A'first (2) .. A'last (2) loop
- -- if A (I1, I2) /= B (J1, J2) then
- -- return false;
+ -- if (A'length (1) = 0 or else A'length (2) = 0)
+ -- and then
+ -- (B'length (1) = 0 or else B'length (2) = 0)
+ -- then
+ -- return True; -- RM 4.5.2(22)
+ -- end if;
+
+ -- if A'length (1) /= B'length (1)
+ -- or else
+ -- A'length (2) /= B'length (2)
+ -- then
+ -- return False; -- RM 4.5.2(23)
+ -- end if;
+
+ -- declare
+ -- A1 : Index_T1 := A'first (1);
+ -- B1 : Index_T1 := B'first (1);
+ -- begin
+ -- loop
+ -- declare
+ -- A2 : Index_T2 := A'first (2);
+ -- B2 : Index_T2 := B'first (2);
+ -- begin
+ -- loop
+ -- if A (A1, A2) /= B (B1, B2) then
+ -- return False;
-- end if;
- -- J2 := Integer'succ (J2);
+
+ -- exit when A2 = A'last (2);
+ -- A2 := Index_T2'succ (A2);
+ -- B2 := Index_T2'succ (B2);
-- end loop;
- -- end if;
- -- J1 := Integer'succ (J1);
+ -- end;
+
+ -- exit when A1 = A'last (1);
+ -- A1 := Index_T1'succ (A1);
+ -- B1 := Index_T1'succ (B1);
-- end loop;
- -- end if;
+ -- end;
+
-- return true;
-- end Enn;
+ -- Note on the formal types used (atyp and btyp). If either of the
+ -- arrays is of a private type, we use the underlying type, and
+ -- do an unchecked conversion of the actual. If either of the arrays
+ -- has a bound depending on a discriminant, then we use the base type
+ -- since otherwise we have an escaped discriminant in the function.
+
+ -- If both arrays are constrained and have the same bounds, we can
+ -- generate a loop with an explicit iteration scheme using a 'Range
+ -- attribute over the first array.
+
function Expand_Array_Equality
(Nod : Node_Id;
- Typ : Entity_Id;
- A_Typ : Entity_Id;
Lhs : Node_Id;
Rhs : Node_Id;
- Bodies : List_Id)
- return Node_Id
+ Bodies : List_Id;
+ Typ : Entity_Id) return Node_Id
is
Loc : constant Source_Ptr := Sloc (Nod);
- Actuals : List_Id;
- Decls : List_Id := New_List;
- Index_List1 : List_Id := New_List;
- Index_List2 : List_Id := New_List;
- Formals : List_Id;
- Stats : Node_Id;
- Func_Name : Entity_Id;
- Func_Body : Node_Id;
+ Decls : constant List_Id := New_List;
+ Index_List1 : constant List_Id := New_List;
+ Index_List2 : constant List_Id := New_List;
+
+ Actuals : List_Id;
+ Formals : List_Id;
+ Func_Name : Entity_Id;
+ Func_Body : Node_Id;
A : constant Entity_Id := Make_Defining_Identifier (Loc, Name_uA);
B : constant Entity_Id := Make_Defining_Identifier (Loc, Name_uB);
+ Ltyp : Entity_Id;
+ Rtyp : Entity_Id;
+ -- The parameter types to be used for the formals
+
+ function Arr_Attr
+ (Arr : Entity_Id;
+ Nam : Name_Id;
+ Num : Int) return Node_Id;
+ -- This builds the attribute reference Arr'Nam (Expr)
+
function Component_Equality (Typ : Entity_Id) return Node_Id;
- -- Create one statement to compare corresponding components, designated
- -- by a full set of indices.
+ -- Create one statement to compare corresponding components,
+ -- designated by a full set of indices.
- function Loop_One_Dimension
+ function Get_Arg_Type (N : Node_Id) return Entity_Id;
+ -- Given one of the arguments, computes the appropriate type to
+ -- be used for that argument in the corresponding function formal
+
+ function Handle_One_Dimension
(N : Int;
- Index : Node_Id)
- return Node_Id;
- -- Loop over the n'th dimension of the arrays. The single statement
- -- in the body of the loop is a loop over the next dimension, or
- -- the comparison of corresponding components.
+ Index : Node_Id) return Node_Id;
+ -- This procedure returns the following code
+ --
+ -- declare
+ -- Bn : Index_T := B'First (N);
+ -- begin
+ -- loop
+ -- xxx
+ -- exit when An = A'Last (N);
+ -- An := Index_T'Succ (An)
+ -- Bn := Index_T'Succ (Bn)
+ -- end loop;
+ -- end;
+ --
+ -- If both indices are constrained and identical, the procedure
+ -- returns a simpler loop:
+ --
+ -- for An in A'Range (N) loop
+ -- xxx
+ -- end loop
+ --
+ -- N is the dimension for which we are generating a loop. Index is the
+ -- N'th index node, whose Etype is Index_Type_n in the above code.
+ -- The xxx statement is either the loop or declare for the next
+ -- dimension or if this is the last dimension the comparison
+ -- of corresponding components of the arrays.
+ --
+ -- The actual way the code works is to return the comparison
+ -- of corresponding components for the N+1 call. That's neater!
+
+ function Test_Empty_Arrays return Node_Id;
+ -- This function constructs the test for both arrays being empty
+ -- (A'length (1) = 0 or else A'length (2) = 0 or else ...)
+ -- and then
+ -- (B'length (1) = 0 or else B'length (2) = 0 or else ...)
+
+ function Test_Lengths_Correspond return Node_Id;
+ -- This function constructs the test for arrays having different
+ -- lengths in at least one index position, in which case resull
+
+ -- A'length (1) /= B'length (1)
+ -- or else
+ -- A'length (2) /= B'length (2)
+ -- or else
+ -- ...
+
+ --------------
+ -- Arr_Attr --
+ --------------
+
+ function Arr_Attr
+ (Arr : Entity_Id;
+ Nam : Name_Id;
+ Num : Int) return Node_Id
+ is
+ begin
+ return
+ Make_Attribute_Reference (Loc,
+ Attribute_Name => Nam,
+ Prefix => New_Reference_To (Arr, Loc),
+ Expressions => New_List (Make_Integer_Literal (Loc, Num)));
+ end Arr_Attr;
------------------------
-- Component_Equality --
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;
- ------------------------
- -- Loop_One_Dimension --
- ------------------------
+ ------------------
+ -- Get_Arg_Type --
+ ------------------
+
+ function Get_Arg_Type (N : Node_Id) return Entity_Id is
+ T : Entity_Id;
+ X : Node_Id;
+
+ begin
+ T := Etype (N);
+
+ if No (T) then
+ return Typ;
- function Loop_One_Dimension
+ else
+ T := Underlying_Type (T);
+
+ X := First_Index (T);
+ while Present (X) loop
+ if Denotes_Discriminant (Type_Low_Bound (Etype (X)))
+ or else
+ Denotes_Discriminant (Type_High_Bound (Etype (X)))
+ then
+ T := Base_Type (T);
+ exit;
+ end if;
+
+ Next_Index (X);
+ end loop;
+
+ return T;
+ end if;
+ end Get_Arg_Type;
+
+ --------------------------
+ -- Handle_One_Dimension --
+ ---------------------------
+
+ function Handle_One_Dimension
(N : Int;
- Index : Node_Id)
- return Node_Id
+ Index : Node_Id) return Node_Id
is
- I : constant Entity_Id := Make_Defining_Identifier (Loc,
- New_Internal_Name ('I'));
- J : constant Entity_Id := Make_Defining_Identifier (Loc,
- New_Internal_Name ('J'));
- Index_Type : Entity_Id;
- Stats : Node_Id;
+ Need_Separate_Indexes : constant Boolean :=
+ Ltyp /= Rtyp
+ or else not Is_Constrained (Ltyp);
+ -- If the index types are identical, and we are working with
+ -- constrained types, then we can use the same index for both of
+ -- the arrays.
+
+ An : constant Entity_Id := Make_Defining_Identifier (Loc,
+ Chars => New_Internal_Name ('A'));
+
+ Bn : Entity_Id;
+ Index_T : Entity_Id;
+ Stm_List : List_Id;
+ Loop_Stm : Node_Id;
begin
- if N > Number_Dimensions (Typ) then
- return Component_Equality (Typ);
+ if N > Number_Dimensions (Ltyp) then
+ return Component_Equality (Ltyp);
+ end if;
+
+ -- Case where we generate a loop
+ Index_T := Base_Type (Etype (Index));
+
+ if Need_Separate_Indexes then
+ Bn :=
+ Make_Defining_Identifier (Loc,
+ Chars => New_Internal_Name ('B'));
else
- -- Generate the following:
+ Bn := An;
+ end if;
- -- j: index_type;
- -- ...
+ Append (New_Reference_To (An, Loc), Index_List1);
+ Append (New_Reference_To (Bn, Loc), Index_List2);
- -- if a'length (n) /= b'length (n) then
- -- return false;
- -- else
- -- j := b'first (n);
- -- for i in a'range (n) loop
- -- -- loop over remaining dimensions.
- -- j := index_type'succ (j);
- -- end loop;
- -- end if;
+ Stm_List := New_List (
+ Handle_One_Dimension (N + 1, Next_Index (Index)));
- -- retrieve index type for current dimension.
+ if Need_Separate_Indexes then
- Index_Type := Base_Type (Etype (Index));
- Append (New_Reference_To (I, Loc), Index_List1);
- Append (New_Reference_To (J, Loc), Index_List2);
+ -- Generate guard for loop, followed by increments of indices
- -- Declare index for j as a local variable to the function.
- -- Index i is a loop variable.
+ Append_To (Stm_List,
+ Make_Exit_Statement (Loc,
+ Condition =>
+ Make_Op_Eq (Loc,
+ Left_Opnd => New_Reference_To (An, Loc),
+ Right_Opnd => Arr_Attr (A, Name_Last, N))));
- Append_To (Decls,
- Make_Object_Declaration (Loc,
- Defining_Identifier => J,
- Object_Definition => New_Reference_To (Index_Type, Loc)));
+ Append_To (Stm_List,
+ Make_Assignment_Statement (Loc,
+ Name => New_Reference_To (An, Loc),
+ Expression =>
+ Make_Attribute_Reference (Loc,
+ Prefix => New_Reference_To (Index_T, Loc),
+ Attribute_Name => Name_Succ,
+ Expressions => New_List (New_Reference_To (An, Loc)))));
- Stats :=
- Make_Implicit_If_Statement (Nod,
- Condition =>
- Make_Op_Ne (Loc,
- Left_Opnd =>
- Make_Attribute_Reference (Loc,
- Prefix => New_Reference_To (A, Loc),
- Attribute_Name => Name_Length,
- Expressions => New_List (
- Make_Integer_Literal (Loc, N))),
- Right_Opnd =>
- Make_Attribute_Reference (Loc,
- Prefix => New_Reference_To (B, Loc),
- Attribute_Name => Name_Length,
- Expressions => New_List (
- Make_Integer_Literal (Loc, N)))),
+ Append_To (Stm_List,
+ Make_Assignment_Statement (Loc,
+ Name => New_Reference_To (Bn, Loc),
+ Expression =>
+ Make_Attribute_Reference (Loc,
+ Prefix => New_Reference_To (Index_T, Loc),
+ Attribute_Name => Name_Succ,
+ Expressions => New_List (New_Reference_To (Bn, Loc)))));
+ end if;
- Then_Statements => New_List (
- Make_Return_Statement (Loc,
- Expression => New_Occurrence_Of (Standard_False, Loc))),
+ -- If separate indexes, we need a declare block for An and Bn, and a
+ -- loop without an iteration scheme.
- Else_Statements => New_List (
+ if Need_Separate_Indexes then
+ Loop_Stm :=
+ Make_Implicit_Loop_Statement (Nod, Statements => Stm_List);
- Make_Assignment_Statement (Loc,
- Name => New_Reference_To (J, Loc),
- Expression =>
- Make_Attribute_Reference (Loc,
- Prefix => New_Reference_To (B, Loc),
- Attribute_Name => Name_First,
- Expressions => New_List (
- Make_Integer_Literal (Loc, N)))),
-
- Make_Implicit_Loop_Statement (Nod,
- Identifier => Empty,
- Iteration_Scheme =>
- Make_Iteration_Scheme (Loc,
- Loop_Parameter_Specification =>
- Make_Loop_Parameter_Specification (Loc,
- Defining_Identifier => I,
- Discrete_Subtype_Definition =>
- Make_Attribute_Reference (Loc,
- Prefix => New_Reference_To (A, Loc),
- Attribute_Name => Name_Range,
- Expressions => New_List (
- Make_Integer_Literal (Loc, N))))),
-
- Statements => New_List (
- Loop_One_Dimension (N + 1, Next_Index (Index)),
- Make_Assignment_Statement (Loc,
- Name => New_Reference_To (J, Loc),
- Expression =>
- Make_Attribute_Reference (Loc,
- Prefix => New_Reference_To (Index_Type, Loc),
- Attribute_Name => Name_Succ,
- Expressions => New_List (
- New_Reference_To (J, Loc))))))));
+ return
+ Make_Block_Statement (Loc,
+ Declarations => New_List (
+ Make_Object_Declaration (Loc,
+ Defining_Identifier => An,
+ Object_Definition => New_Reference_To (Index_T, Loc),
+ Expression => Arr_Attr (A, Name_First, N)),
+
+ Make_Object_Declaration (Loc,
+ Defining_Identifier => Bn,
+ Object_Definition => New_Reference_To (Index_T, Loc),
+ Expression => Arr_Attr (B, Name_First, N))),
- return Stats;
+ Handled_Statement_Sequence =>
+ Make_Handled_Sequence_Of_Statements (Loc,
+ Statements => New_List (Loop_Stm)));
+
+ -- If no separate indexes, return loop statement with explicit
+ -- iteration scheme on its own
+
+ else
+ Loop_Stm :=
+ Make_Implicit_Loop_Statement (Nod,
+ Statements => Stm_List,
+ Iteration_Scheme =>
+ Make_Iteration_Scheme (Loc,
+ Loop_Parameter_Specification =>
+ Make_Loop_Parameter_Specification (Loc,
+ Defining_Identifier => An,
+ Discrete_Subtype_Definition =>
+ Arr_Attr (A, Name_Range, N))));
+ return Loop_Stm;
end if;
- end Loop_One_Dimension;
+ end Handle_One_Dimension;
+
+ -----------------------
+ -- Test_Empty_Arrays --
+ -----------------------
+
+ function Test_Empty_Arrays return Node_Id is
+ Alist : Node_Id;
+ Blist : Node_Id;
+
+ Atest : Node_Id;
+ Btest : Node_Id;
+
+ begin
+ Alist := Empty;
+ Blist := Empty;
+ for J in 1 .. Number_Dimensions (Ltyp) loop
+ Atest :=
+ Make_Op_Eq (Loc,
+ Left_Opnd => Arr_Attr (A, Name_Length, J),
+ Right_Opnd => Make_Integer_Literal (Loc, 0));
+
+ Btest :=
+ Make_Op_Eq (Loc,
+ Left_Opnd => Arr_Attr (B, Name_Length, J),
+ Right_Opnd => Make_Integer_Literal (Loc, 0));
+
+ if No (Alist) then
+ Alist := Atest;
+ Blist := Btest;
+
+ else
+ Alist :=
+ Make_Or_Else (Loc,
+ Left_Opnd => Relocate_Node (Alist),
+ Right_Opnd => Atest);
+
+ Blist :=
+ Make_Or_Else (Loc,
+ Left_Opnd => Relocate_Node (Blist),
+ Right_Opnd => Btest);
+ end if;
+ end loop;
+
+ return
+ Make_And_Then (Loc,
+ Left_Opnd => Alist,
+ Right_Opnd => Blist);
+ end Test_Empty_Arrays;
+
+ -----------------------------
+ -- Test_Lengths_Correspond --
+ -----------------------------
+
+ function Test_Lengths_Correspond return Node_Id is
+ Result : Node_Id;
+ Rtest : Node_Id;
+
+ begin
+ Result := Empty;
+ for J in 1 .. Number_Dimensions (Ltyp) loop
+ Rtest :=
+ Make_Op_Ne (Loc,
+ Left_Opnd => Arr_Attr (A, Name_Length, J),
+ Right_Opnd => Arr_Attr (B, Name_Length, J));
+
+ if No (Result) then
+ Result := Rtest;
+ else
+ Result :=
+ Make_Or_Else (Loc,
+ Left_Opnd => Relocate_Node (Result),
+ Right_Opnd => Rtest);
+ end if;
+ end loop;
+
+ return Result;
+ end Test_Lengths_Correspond;
-- Start of processing for Expand_Array_Equality
begin
+ Ltyp := Get_Arg_Type (Lhs);
+ Rtyp := Get_Arg_Type (Rhs);
+
+ -- For now, if the argument types are not the same, go to the
+ -- base type, since the code assumes that the formals have the
+ -- same type. This is fixable in future ???
+
+ if Ltyp /= Rtyp then
+ Ltyp := Base_Type (Ltyp);
+ Rtyp := Base_Type (Rtyp);
+ pragma Assert (Ltyp = Rtyp);
+ end if;
+
+ -- Build list of formals for function
+
Formals := New_List (
Make_Parameter_Specification (Loc,
Defining_Identifier => A,
- Parameter_Type => New_Reference_To (Typ, Loc)),
+ Parameter_Type => New_Reference_To (Ltyp, Loc)),
Make_Parameter_Specification (Loc,
Defining_Identifier => B,
- Parameter_Type => New_Reference_To (Typ, Loc)));
+ Parameter_Type => New_Reference_To (Rtyp, Loc)));
Func_Name := Make_Defining_Identifier (Loc, New_Internal_Name ('E'));
- Stats := Loop_One_Dimension (1, First_Index (Typ));
+ -- Build statement sequence for function
Func_Body :=
Make_Subprogram_Body (Loc,
Make_Function_Specification (Loc,
Defining_Unit_Name => Func_Name,
Parameter_Specifications => Formals,
- Subtype_Mark => New_Reference_To (Standard_Boolean, Loc)),
- Declarations => Decls,
+ Result_Definition => New_Reference_To (Standard_Boolean, Loc)),
+
+ Declarations => Decls,
+
Handled_Statement_Sequence =>
Make_Handled_Sequence_Of_Statements (Loc,
Statements => New_List (
- Stats,
- Make_Return_Statement (Loc,
+
+ Make_Implicit_If_Statement (Nod,
+ Condition => Test_Empty_Arrays,
+ Then_Statements => New_List (
+ 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_Simple_Return_Statement (Loc,
+ Expression =>
+ New_Occurrence_Of (Standard_False, Loc)))),
+
+ Handle_One_Dimension (1, First_Index (Ltyp)),
+
+ Make_Simple_Return_Statement (Loc,
Expression => New_Occurrence_Of (Standard_True, Loc)))));
Set_Has_Completion (Func_Name, True);
+ Set_Is_Inlined (Func_Name);
-- If the array type is distinct from the type of the arguments,
-- it is the full view of a private type. Apply an unchecked
-- conversion to insure that analysis of the call succeeds.
- if Base_Type (A_Typ) /= Base_Type (Typ) then
- Actuals := New_List (
- OK_Convert_To (Typ, Lhs),
- OK_Convert_To (Typ, Rhs));
- else
- Actuals := New_List (Lhs, Rhs);
- end if;
+ declare
+ L, R : Node_Id;
+
+ begin
+ L := Lhs;
+ R := Rhs;
+
+ if No (Etype (Lhs))
+ or else Base_Type (Etype (Lhs)) /= Base_Type (Ltyp)
+ then
+ L := OK_Convert_To (Ltyp, Lhs);
+ end if;
+
+ if No (Etype (Rhs))
+ or else Base_Type (Etype (Rhs)) /= Base_Type (Rtyp)
+ then
+ R := OK_Convert_To (Rtyp, Rhs);
+ end if;
+
+ Actuals := New_List (L, R);
+ end;
Append_To (Bodies, Func_Body);
return
Make_Function_Call (Loc,
- Name => New_Reference_To (Func_Name, Loc),
+ Name => New_Reference_To (Func_Name, Loc),
Parameter_Associations => Actuals);
end Expand_Array_Equality;
-- since we always want to deal with types that have bounds.
procedure Expand_Boolean_Operator (N : Node_Id) is
- Typ : constant Entity_Id := Etype (N);
+ 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
+ -- 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.
- -- For the normal non-packed case, the 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.
+ 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));
+ 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);
+
+ 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));
Rewrite (N,
Make_Function_Call (Loc,
- Name => New_Reference_To (Func_Name, Loc),
+ Name => New_Reference_To (Func_Name, Loc),
Parameter_Associations =>
- New_List
- (L, Make_Type_Conversion
- (Loc, New_Reference_To (Etype (L), Loc), R))));
+ New_List (
+ L,
+ Make_Type_Conversion
+ (Loc, New_Reference_To (Etype (L), Loc), R))));
Analyze_And_Resolve (N, Typ);
- end;
- end if;
+ end if;
+ end;
end Expand_Boolean_Operator;
-------------------------------
Typ : Entity_Id;
Lhs : Node_Id;
Rhs : Node_Id;
- Bodies : List_Id)
- return Node_Id
+ Bodies : List_Id) return Node_Id
is
Loc : constant Source_Ptr := Sloc (Nod);
Full_Type : Entity_Id;
-- case of any composite type recursively containing such fields.
else
- return Expand_Array_Equality
- (Nod, Full_Type, Typ, Lhs, Rhs, Bodies);
+ return Expand_Array_Equality (Nod, Lhs, Rhs, Bodies, Full_Type);
end if;
elsif Is_Tagged_Type (Full_Type) then
Eq_Op := Node (Prim);
exit when Chars (Eq_Op) = Name_Op_Eq
and then Etype (First_Formal (Eq_Op)) =
- Etype (Next_Formal (First_Formal (Eq_Op)));
+ Etype (Next_Formal (First_Formal (Eq_Op)))
+ and then Base_Type (Etype (Eq_Op)) = Standard_Boolean;
Next_Elmt (Prim);
pragma Assert (Present (Prim));
end loop;
Unchecked_Convert_To (Etype (First_Formal (Eq_Op)), Rhs)));
elsif Is_Record_Type (Full_Type) then
- Eq_Op := TSS (Full_Type, Name_uEquality);
+ Eq_Op := TSS (Full_Type, TSS_Composite_Equality);
if Present (Eq_Op) then
if Etype (First_Formal (Eq_Op)) /= Full_Type then
-- to match signature of operation.
declare
- T : Entity_Id := Etype (First_Formal (Eq_Op));
+ T : constant Entity_Id := Etype (First_Formal (Eq_Op));
begin
return
end;
else
+ -- Comparison between Unchecked_Union components
+
+ if Is_Unchecked_Union (Full_Type) then
+ declare
+ Lhs_Type : Node_Id := Full_Type;
+ Rhs_Type : Node_Id := Full_Type;
+ Lhs_Discr_Val : Node_Id;
+ Rhs_Discr_Val : Node_Id;
+
+ begin
+ -- Lhs subtype
+
+ if Nkind (Lhs) = N_Selected_Component then
+ Lhs_Type := Etype (Entity (Selector_Name (Lhs)));
+ end if;
+
+ -- Rhs subtype
+
+ if Nkind (Rhs) = N_Selected_Component then
+ Rhs_Type := Etype (Entity (Selector_Name (Rhs)));
+ end if;
+
+ -- Lhs of the composite equality
+
+ if Is_Constrained (Lhs_Type) then
+
+ -- Since the enclosing record can never be an
+ -- Unchecked_Union (this code is executed for records
+ -- that do not have variants), we may reference its
+ -- discriminant(s).
+
+ if Nkind (Lhs) = N_Selected_Component
+ and then Has_Per_Object_Constraint (
+ Entity (Selector_Name (Lhs)))
+ then
+ Lhs_Discr_Val :=
+ Make_Selected_Component (Loc,
+ Prefix => Prefix (Lhs),
+ Selector_Name =>
+ New_Copy (
+ Get_Discriminant_Value (
+ First_Discriminant (Lhs_Type),
+ Lhs_Type,
+ Stored_Constraint (Lhs_Type))));
+
+ else
+ Lhs_Discr_Val := New_Copy (
+ Get_Discriminant_Value (
+ First_Discriminant (Lhs_Type),
+ Lhs_Type,
+ Stored_Constraint (Lhs_Type)));
+
+ end if;
+ else
+ -- It is not possible to infer the discriminant since
+ -- the subtype is not constrained.
+
+ return
+ Make_Raise_Program_Error (Loc,
+ Reason => PE_Unchecked_Union_Restriction);
+ end if;
+
+ -- Rhs of the composite equality
+
+ if Is_Constrained (Rhs_Type) then
+ if Nkind (Rhs) = N_Selected_Component
+ and then Has_Per_Object_Constraint (
+ Entity (Selector_Name (Rhs)))
+ then
+ Rhs_Discr_Val :=
+ Make_Selected_Component (Loc,
+ Prefix => Prefix (Rhs),
+ Selector_Name =>
+ New_Copy (
+ Get_Discriminant_Value (
+ First_Discriminant (Rhs_Type),
+ Rhs_Type,
+ Stored_Constraint (Rhs_Type))));
+
+ else
+ Rhs_Discr_Val := New_Copy (
+ Get_Discriminant_Value (
+ First_Discriminant (Rhs_Type),
+ Rhs_Type,
+ Stored_Constraint (Rhs_Type)));
+
+ end if;
+ else
+ return
+ Make_Raise_Program_Error (Loc,
+ Reason => PE_Unchecked_Union_Restriction);
+ end if;
+
+ -- Call the TSS equality function with the inferred
+ -- discriminant values.
+
+ return
+ Make_Function_Call (Loc,
+ Name => New_Reference_To (Eq_Op, Loc),
+ Parameter_Associations => New_List (
+ Lhs,
+ Rhs,
+ Lhs_Discr_Val,
+ Rhs_Discr_Val));
+ end;
+ end if;
+
+ -- Shouldn't this be an else, we can't fall through
+ -- the above IF, right???
+
return
Make_Function_Call (Loc,
Name => New_Reference_To (Eq_Op, Loc),
-- their base type, Ind_Typ their index type, and Arr_Typ the original
-- array type to which the concatenantion operator applies, then the
-- following subprogram is constructed:
- --
+
-- [function Cnn (S1 : Base_Typ; ...; Sn : Base_Typ) return Base_Typ is
-- L : Ind_Typ;
-- begin
-- else
-- return Sn;
-- end if;
- --
+
-- declare
-- P : Ind_Typ;
-- H : Ind_Typ :=
-- P := Ind_Typ'Succ (P);
-- end loop;
-- end if;
- --
+
-- ...
- --
+
-- if Sn'Length /= 0 then
-- P := Sn'First;
-- loop
-- P := Ind_Typ'Succ (P);
-- end loop;
-- end if;
- --
+
-- return R;
-- end;
-- end Cnn;]
Params : List_Id;
Operand : Node_Id;
- function Copy_Into_R_S (I : Nat) return List_Id;
+ function Copy_Into_R_S (I : Nat; Last : Boolean) return List_Id;
-- Builds the sequence of statement:
-- P := Si'First;
-- loop
-- end loop;
--
-- where i is the input parameter I given.
+ -- If the flag Last is true, the exit statement is emitted before
+ -- incrementing the lower bound, to prevent the creation out of
+ -- bound values.
function Init_L (I : Nat) return Node_Id;
-- Builds the statement:
-- 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 Ind_Typ'Pos (L).
+ -- 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 --
-------------------
- function Copy_Into_R_S (I : Nat) return List_Id is
- Stmts : List_Id := New_List;
+ function Copy_Into_R_S (I : Nat; Last : Boolean) return List_Id is
+ Stmts : constant List_Id := New_List;
P_Start : Node_Id;
Loop_Stmt : Node_Id;
R_Copy : Node_Id;
Name => P,
Expression => P_Succ);
- Loop_Stmt :=
- Make_Implicit_Loop_Statement (Cnode,
- Statements => New_List (R_Copy, L_Inc, Exit_Stmt, P_Inc));
+ if Last then
+ Loop_Stmt :=
+ Make_Implicit_Loop_Statement (Cnode,
+ Statements => New_List (R_Copy, Exit_Stmt, L_Inc, P_Inc));
+ else
+ Loop_Stmt :=
+ Make_Implicit_Loop_Statement (Cnode,
+ Statements => New_List (R_Copy, L_Inc, Exit_Stmt, P_Inc));
+ end if;
Append_To (Stmts, Loop_Stmt);
-----------
function L_Pos return Node_Id is
+ Target_Type : Entity_Id;
+
begin
+ -- If the index type is an enumeration type, the computation
+ -- can be done in standard integer. Otherwise, choose a large
+ -- enough integer type.
+
+ if Is_Enumeration_Type (Ind_Typ)
+ or else Root_Type (Ind_Typ) = Standard_Integer
+ or else Root_Type (Ind_Typ) = Standard_Short_Integer
+ or else Root_Type (Ind_Typ) = Standard_Short_Short_Integer
+ then
+ Target_Type := Standard_Integer;
+ else
+ Target_Type := Root_Type (Ind_Typ);
+ end if;
+
return
- Make_Attribute_Reference (Loc,
- Prefix => New_Reference_To (Ind_Typ, Loc),
- Attribute_Name => Name_Pos,
- Expressions => New_List (L));
+ Make_Qualified_Expression (Loc,
+ Subtype_Mark => New_Reference_To (Target_Type, Loc),
+ Expression =>
+ Make_Attribute_Reference (Loc,
+ Prefix => New_Reference_To (Ind_Typ, Loc),
+ Attribute_Name => Name_Pos,
+ Expressions => New_List (L)));
end L_Pos;
------------
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
Append_To (Declare_Stmts,
Make_Implicit_If_Statement (Cnode,
Condition => S_Length_Test (I),
- Then_Statements => Copy_Into_R_S (I)));
+ 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
- -- derefencing an unconstrained array. An there we need a constraint
+ -- dereferencing an unconstrained array. An 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);
end if;
-- If we have anything other than Standard_Character or
- -- Standard_String, then we must have had an error earlier.
- -- So we just abandon the attempt at expansion.
+ -- Standard_String, then we must have had a serious error
+ -- earlier, so we just abandon the attempt at expansion.
else
- pragma Assert (Errors_Detected > 0);
+ pragma Assert (Serious_Errors_Detected > 0);
return;
end if;
Parameter_Associations => Opnds));
Analyze_And_Resolve (Cnode, Standard_String);
+
+ exception
+ when RE_Not_Available =>
+ return;
end Expand_Concatenate_String;
------------------------
procedure Expand_N_Allocator (N : Node_Id) is
PtrT : constant Entity_Id := Etype (N);
- Desig : Entity_Id;
+ Dtyp : constant Entity_Id := Designated_Type (PtrT);
+ 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;
- begin
- -- RM E.2.3(22). We enforce that the expected type of an allocator
- -- shall not be a remote access-to-class-wide-limited-private type
+ procedure Complete_Coextension_Finalization;
+ -- Generate finalization calls for all nested coextensions of N. This
+ -- routine may allocate list controllers if necessary.
- -- Why is this being done at expansion time, seems clearly wrong ???
+ procedure Rewrite_Coextension (N : Node_Id);
+ -- Static coextensions have the same lifetime as the entity they
+ -- constrain. Such occurences can be rewritten as aliased objects
+ -- and their unrestricted access used instead of the coextension.
- Validate_Remote_Access_To_Class_Wide_Type (N);
+ ---------------------------------------
+ -- Complete_Coextension_Finalization --
+ ---------------------------------------
- -- Set the Storage Pool
+ procedure Complete_Coextension_Finalization is
+ Coext : Node_Id;
+ Coext_Elmt : Elmt_Id;
+ Flist : Node_Id;
+ Ref : Node_Id;
- Set_Storage_Pool (N, Associated_Storage_Pool (Root_Type (PtrT)));
+ function Inside_A_Return_Statement (N : Node_Id) return Boolean;
+ -- Determine whether node N is part of a return statement
- if Present (Storage_Pool (N)) then
- if Is_RTE (Storage_Pool (N), RE_SS_Pool) then
- if not Java_VM then
- Set_Procedure_To_Call (N, RTE (RE_SS_Allocate));
+ function Needs_Initialization_Call (N : Node_Id) return Boolean;
+ -- Determine whether node N is a subtype indicator allocator which
+ -- asts 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;
- else
- Set_Procedure_To_Call (N,
- Find_Prim_Op (Etype (Storage_Pool (N)), Name_Allocate));
+
+ 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;
- end if;
- -- Under certain circumstances we can replace an allocator by an
- -- access to statically allocated storage. The conditions, as noted
- -- in AARM 3.10 (10c) are as follows:
+ Flist :=
+ Make_Selected_Component (Loc,
+ Prefix =>
+ New_Reference_To (Associated_Final_Chain (PtrT), Loc),
+ Selector_Name =>
+ Make_Identifier (Loc, Name_F));
- -- Size and initial value is known at compile time
- -- Access type is access-to-constant
+ Coext_Elmt := First_Elmt (Coextensions (N));
+ while Present (Coext_Elmt) loop
+ Coext := Node (Coext_Elmt);
- if Is_Access_Constant (PtrT)
- and then Nkind (Expression (N)) = N_Qualified_Expression
- and then Compile_Time_Known_Value (Expression (Expression (N)))
- and then Size_Known_At_Compile_Time (Etype (Expression
- (Expression (N))))
- then
- -- Here we can do the optimization. For the allocator
+ -- Generate:
+ -- typ! (coext.all)
- -- new x'(y)
+ 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;
- -- We insert an object declaration
+ -- Generate:
+ -- initialize (Ref)
+ -- attach_to_final_list (Ref, Flist, 2)
- -- Tnn : aliased x := y;
+ 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)));
- -- and replace the allocator by Tnn'Unrestricted_Access.
- -- Tnn is marked as requiring static allocation.
+ -- Generate:
+ -- attach_to_final_list (Ref, Flist, 2)
- Temp :=
- Make_Defining_Identifier (Loc, New_Internal_Name ('T'));
+ 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;
- Desig := Subtype_Mark (Expression (N));
+ Next_Elmt (Coext_Elmt);
+ end loop;
+ end Complete_Coextension_Finalization;
- -- If context is constrained, use constrained subtype directly,
- -- so that the constant is not labelled as having a nomimally
- -- unconstrained subtype.
+ -------------------------
+ -- Rewrite_Coextension --
+ -------------------------
- if Entity (Desig) = Base_Type (Designated_Type (PtrT)) then
- Desig := New_Occurrence_Of (Designated_Type (PtrT), Loc);
+ 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;
- Insert_Action (N,
- Make_Object_Declaration (Loc,
- Defining_Identifier => Temp,
- Aliased_Present => True,
- Constant_Present => Is_Access_Constant (PtrT),
- Object_Definition => Desig,
- Expression => Expression (Expression (N))));
+ -- 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),
+ Prefix => New_Occurrence_Of (Temp, Loc),
Attribute_Name => Name_Unrestricted_Access));
Analyze_And_Resolve (N, PtrT);
+ end Rewrite_Coextension;
- -- We set the variable as statically allocated, since we don't
- -- want it going on the stack of the current procedure!
-
- Set_Is_Statically_Allocated (Temp);
- return;
- end if;
-
- -- If the allocator is for a type which requires initialization, and
- -- there is no initial value (i.e. the 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 the 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 Nkind (Expression (N)) = N_Qualified_Expression then
- declare
- Indic : constant Node_Id := Subtype_Mark (Expression (N));
- T : constant Entity_Id := Entity (Indic);
- Exp : constant Node_Id := Expression (Expression (N));
+ -- Start of processing for Expand_N_Allocator
- Aggr_In_Place : constant Boolean := Is_Delayed_Aggregate (Exp);
+ begin
+ -- RM E.2.3(22). We enforce that the expected type of an allocator
+ -- shall not be a remote access-to-class-wide-limited-private type
- Tag_Assign : Node_Id;
- Tmp_Node : Node_Id;
+ -- Why is this being done at expansion time, seems clearly wrong ???
- begin
- if Is_Tagged_Type (T) or else Controlled_Type (T) then
-
- -- Actions inserted before:
- -- Temp : constant ptr_T := new T'(Expression);
- -- <no CW> Temp._tag := T'tag;
- -- <CTRL> Adjust (Finalizable (Temp.all));
- -- <CTRL> Attach_To_Final_List (Finalizable (Temp.all));
-
- -- We analyze by hand the new internal allocator to avoid
- -- any recursion and inappropriate call to Initialize
- if not Aggr_In_Place then
- Remove_Side_Effects (Exp);
- end if;
+ Validate_Remote_Access_To_Class_Wide_Type (N);
- Temp :=
- Make_Defining_Identifier (Loc, New_Internal_Name ('P'));
+ -- Set the Storage Pool
- -- For a class wide allocation generate the following code:
+ Set_Storage_Pool (N, Associated_Storage_Pool (Root_Type (PtrT)));
- -- type Equiv_Record is record ... end record;
- -- implicit subtype CW is <Class_Wide_Subytpe>;
- -- temp : PtrT := new CW'(CW!(expr));
+ if Present (Storage_Pool (N)) then
+ if Is_RTE (Storage_Pool (N), RE_SS_Pool) then
+ if VM_Target = No_VM then
+ Set_Procedure_To_Call (N, RTE (RE_SS_Allocate));
+ end if;
- if Is_Class_Wide_Type (T) then
- Expand_Subtype_From_Expr (Empty, T, Indic, Exp);
+ elsif Is_Class_Wide_Type (Etype (Storage_Pool (N))) then
+ Set_Procedure_To_Call (N, RTE (RE_Allocate_Any));
- Set_Expression (Expression (N),
- Unchecked_Convert_To (Entity (Indic), Exp));
+ else
+ Set_Procedure_To_Call (N,
+ Find_Prim_Op (Etype (Storage_Pool (N)), Name_Allocate));
+ end if;
+ end if;
- Analyze_And_Resolve (Expression (N), Entity (Indic));
- end if;
+ -- Under certain circumstances we can replace an allocator by an
+ -- access to statically allocated storage. The conditions, as noted
+ -- in AARM 3.10 (10c) are as follows:
- 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)));
+ -- Size and initial value is known at compile time
+ -- Access type is access-to-constant
- Set_No_Initialization (Expression (Tmp_Node));
- Insert_Action (N, Tmp_Node);
- Convert_Aggr_In_Allocator (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;
+ -- The allocator is not part of a constraint on a record component,
+ -- because in that case the inserted actions are delayed until the
+ -- record declaration is fully analyzed, which is too late for the
+ -- analysis of the rewritten allocator.
- -- Suppress the tag assignment when Java_VM because JVM tags
- -- are represented implicitly in objects.
+ if Is_Access_Constant (PtrT)
+ and then Nkind (Expression (N)) = N_Qualified_Expression
+ and then Compile_Time_Known_Value (Expression (Expression (N)))
+ and then Size_Known_At_Compile_Time (Etype (Expression
+ (Expression (N))))
+ and then not Is_Record_Type (Current_Scope)
+ then
+ -- Here we can do the optimization. For the allocator
- if Is_Tagged_Type (T)
- and then not Is_Class_Wide_Type (T)
- and then not Java_VM
- then
- Tag_Assign :=
- Make_Assignment_Statement (Loc,
- Name =>
- Make_Selected_Component (Loc,
- Prefix => New_Reference_To (Temp, Loc),
- Selector_Name =>
- New_Reference_To (Tag_Component (T), Loc)),
+ -- new x'(y)
- Expression =>
- Unchecked_Convert_To (RTE (RE_Tag),
- New_Reference_To (Access_Disp_Table (T), Loc)));
+ -- We insert an object declaration
- -- The previous assignment has to be done in any case
+ -- Tnn : aliased x := y;
- Set_Assignment_OK (Name (Tag_Assign));
- Insert_Action (N, Tag_Assign);
+ -- and replace the allocator by Tnn'Unrestricted_Access.
+ -- Tnn is marked as requiring static allocation.
- 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)));
+ Temp :=
+ Make_Defining_Identifier (Loc, New_Internal_Name ('T'));
- 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;
+ Desig := Subtype_Mark (Expression (N));
- if Controlled_Type (Designated_Type (PtrT))
- and then Controlled_Type (T)
- then
- declare
- Flist : Node_Id;
- Attach : Node_Id;
- Apool : constant Entity_Id :=
- Associated_Storage_Pool (PtrT);
+ -- If context is constrained, use constrained subtype directly,
+ -- so that the constant is not labelled as having a nomimally
+ -- unconstrained subtype.
- begin
- -- If it is an allocation on the secondary stack
- -- (i.e. a value returned from a function), the object
- -- is attached on the caller side as soon as the call
- -- is completed (see Expand_Ctrl_Function_Call)
-
- if Is_RTE (Apool, RE_SS_Pool) then
- declare
- F : constant Entity_Id :=
- Make_Defining_Identifier (Loc,
- New_Internal_Name ('F'));
- begin
- Insert_Action (N,
- Make_Object_Declaration (Loc,
- Defining_Identifier => F,
- Object_Definition => New_Reference_To (RTE
- (RE_Finalizable_Ptr), Loc)));
-
- Flist := New_Reference_To (F, Loc);
- Attach := Make_Integer_Literal (Loc, 1);
- end;
-
- -- Normal case, not a secondary stack allocation
+ if Entity (Desig) = Base_Type (Dtyp) then
+ Desig := New_Occurrence_Of (Dtyp, Loc);
+ end if;
- else
- Flist := Find_Final_List (PtrT);
- Attach := Make_Integer_Literal (Loc, 2);
- end if;
+ Insert_Action (N,
+ Make_Object_Declaration (Loc,
+ Defining_Identifier => Temp,
+ Aliased_Present => True,
+ Constant_Present => Is_Access_Constant (PtrT),
+ Object_Definition => Desig,
+ Expression => Expression (Expression (N))));
- if not Aggr_In_Place then
- Insert_Actions (N,
- Make_Adjust_Call (
- Ref =>
+ Rewrite (N,
+ Make_Attribute_Reference (Loc,
+ Prefix => New_Occurrence_Of (Temp, Loc),
+ Attribute_Name => Name_Unrestricted_Access));
- -- An unchecked conversion is needed in the
- -- classwide case because the designated type
- -- can be an ancestor of the subtype mark of
- -- the allocator.
+ Analyze_And_Resolve (N, PtrT);
- Unchecked_Convert_To (T,
- Make_Explicit_Dereference (Loc,
- New_Reference_To (Temp, Loc))),
+ -- We set the variable as statically allocated, since we don't
+ -- want it going on the stack of the current procedure!
- Typ => T,
- Flist_Ref => Flist,
- With_Attach => Attach));
- end if;
- end;
- end if;
+ Set_Is_Statically_Allocated (Temp);
+ return;
+ end if;
- Rewrite (N, New_Reference_To (Temp, Loc));
- Analyze_And_Resolve (N, PtrT);
+ -- 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.
- elsif Aggr_In_Place then
- Temp :=
- Make_Defining_Identifier (Loc, New_Internal_Name ('P'));
- 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)));
+ if Is_Static_Coextension (N) then
+ Rewrite_Coextension (N);
+ return;
+ end if;
- Set_No_Initialization (Expression (Tmp_Node));
- Insert_Action (N, Tmp_Node);
- Convert_Aggr_In_Allocator (Tmp_Node, Exp);
- Rewrite (N, New_Reference_To (Temp, Loc));
- Analyze_And_Resolve (N, PtrT);
+ -- 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.
- elsif Is_Access_Type (Designated_Type (PtrT))
- and then Nkind (Exp) = N_Allocator
- and then Nkind (Expression (Exp)) /= N_Qualified_Expression
- then
- -- Apply constraint to designated subtype indication.
+ if Is_Coextension_Root (N) then
+ Complete_Coextension_Finalization;
+ end if;
- Apply_Constraint_Check (Expression (Exp),
- Designated_Type (Designated_Type (PtrT)),
- No_Sliding => True);
+ -- Handle case of qualified expression (other than optimization above)
- if Nkind (Expression (Exp)) = N_Raise_Constraint_Error then
+ if Nkind (Expression (N)) = N_Qualified_Expression then
+ Expand_Allocator_Expression (N);
+ return;
+ end if;
- -- Propagate constraint_error to enclosing allocator.
+ -- 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:
- Rewrite
- (Exp, New_Copy (Expression (Exp)));
- end if;
- else
- -- First check against the type of the qualified expression
- --
- -- NOTE: The commented call should be correct, but for
- -- some reason causes the compiler to bomb (sigsegv) on
- -- ACVC test c34007g, so for now we just perform the old
- -- (incorrect) test against the designated subtype with
- -- no sliding in the else part of the if statement below.
- -- ???
- --
- -- Apply_Constraint_Check (Exp, T, No_Sliding => True);
-
- -- A check is also needed in cases where the designated
- -- subtype is constrained and differs from the subtype
- -- given in the qualified expression. Note that the check
- -- on the qualified expression does not allow sliding,
- -- but this check does (a relaxation from Ada 83).
-
- if Is_Constrained (Designated_Type (PtrT))
- and then not Subtypes_Statically_Match
- (T, Designated_Type (PtrT))
- then
- Apply_Constraint_Check
- (Exp, Designated_Type (PtrT), No_Sliding => False);
+ -- [Pnnn : constant ptr_T := new (T); Init (Pnnn.all,...); Pnnn]
- -- The nonsliding check should really be performed
- -- (unconditionally) against the subtype of the
- -- qualified expression, but that causes a problem
- -- with c34007g (see above), so for now we retain this.
+ -- 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.
- else
- Apply_Constraint_Check
- (Exp, Designated_Type (PtrT), No_Sliding => True);
- end if;
- end if;
- end;
+ 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;
- -- Here if not qualified expression case.
- -- In this case, an initialization routine may be required
+ begin
+ if No_Initialization (N) then
+ null;
- 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;
+ -- Case of no initialization procedure present
- begin
+ elsif not Has_Non_Null_Base_Init_Proc (T) then
- 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
- Rewrite (Expression (N),
- Make_Qualified_Expression (Loc,
- Subtype_Mark => New_Occurrence_Of (T, Loc),
- Expression => Get_Simple_Init_Val (T, Loc)));
+ 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
+ Init := Base_Init_Proc (T);
+ Nod := N;
+ Temp := Make_Defining_Identifier (Loc, New_Internal_Name ('P'));
- else
- null;
- end if;
+ -- Construct argument list for the initialization routine call
- -- Case of initialization procedure present, must be called
+ Arg1 :=
+ Make_Explicit_Dereference (Loc,
+ Prefix => New_Reference_To (Temp, Loc));
+ Set_Assignment_OK (Arg1);
+ Temp_Type := PtrT;
- else
- Init := Base_Init_Proc (T);
- Node := N;
- Temp :=
- Make_Defining_Identifier (Loc, New_Internal_Name ('P'));
+ -- 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.
- -- Construct argument list for the initialization routine call
- -- The CPP constructor needs the address directly
+ if Is_Class_Wide_Type (Dtyp) then
+ Arg1 := Unchecked_Convert_To (T, Arg1);
+ end if;
- if Is_CPP_Class (T) then
- Arg1 := New_Reference_To (Temp, Loc);
- Temp_Type := T;
+ -- 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.
- else
- Arg1 :=
- Make_Explicit_Dereference (Loc,
- Prefix => New_Reference_To (Temp, Loc));
- Set_Assignment_OK (Arg1);
- Temp_Type := PtrT;
+ if Is_Concurrent_Type (T) then
+ Arg1 :=
+ Unchecked_Convert_To (Corresponding_Record_Type (T), Arg1);
- -- 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.
+ elsif Is_Private_Type (T)
+ and then Present (Full_View (T))
+ and then Is_Concurrent_Type (Full_View (T))
+ then
+ Arg1 :=
+ Unchecked_Convert_To
+ (Corresponding_Record_Type (Full_View (T)), Arg1);
- if Is_Class_Wide_Type (Designated_Type (PtrT)) then
- Arg1 := Unchecked_Convert_To (T, Arg1);
- end if;
- end if;
+ elsif Etype (First_Formal (Init)) /= Base_Type (T) then
+ declare
+ Ftyp : constant Entity_Id := Etype (First_Formal (Init));
- -- 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.
+ begin
+ Arg1 := OK_Convert_To (Etype (Ftyp), Arg1);
+ Set_Etype (Arg1, Ftyp);
+ end;
+ end if;
- if Is_Concurrent_Type (T) then
- Arg1 :=
- Unchecked_Convert_To (Corresponding_Record_Type (T), Arg1);
+ Args := New_List (Arg1);
- elsif Is_Private_Type (T)
- and then Present (Full_View (T))
- and then Is_Concurrent_Type (Full_View (T))
- then
- Arg1 :=
- Unchecked_Convert_To
- (Corresponding_Record_Type (Full_View (T)), 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).
- elsif Etype (First_Formal (Init)) /= Base_Type (T) then
+ -- 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.
- declare
- Ftyp : constant Entity_Id := Etype (First_Formal (Init));
+ if Has_Task (T) then
+ if No (Master_Id (Base_Type (PtrT))) then
- begin
- Arg1 := OK_Convert_To (Etype (Ftyp), Arg1);
- Set_Etype (Arg1, Ftyp);
- end;
- end if;
+ -- If we have a non-library level task with the restriction
+ -- No_Task_Hierarchy set, then no point in expanding.
- Args := New_List (Arg1);
+ if not Is_Library_Level_Entity (T)
+ and then Restriction_Active (No_Task_Hierarchy)
+ then
+ return;
+ end if;
- -- 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).
+ -- The designated type was an incomplete type, and the
+ -- access type did not get expanded. Salvage it now.
- if Has_Task (T) then
+ pragma Assert (Present (Parent (Base_Type (PtrT))));
+ Expand_N_Full_Type_Declaration (Parent (Base_Type (PtrT)));
+ end if;
- if No (Master_Id (Base_Type (PtrT))) then
+ -- 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.
- -- The designated type was an incomplete type, and
- -- the access type did not get expanded. Salvage
- -- it now.
+ if Nkind (Parent (N)) = N_Assignment_Statement then
+ declare
+ Nam : constant Node_Id := Name (Parent (N));
- Expand_N_Full_Type_Declaration
- (Parent (Base_Type (PtrT)));
- end if;
+ begin
+ if Is_Entity_Name (Nam) then
+ Decls :=
+ Build_Task_Image_Decls (
+ Loc,
+ New_Occurrence_Of
+ (Entity (Nam), Sloc (Nam)), T);
+
+ elsif Nkind_In
+ (Nam, N_Indexed_Component, N_Selected_Component)
+ and then Is_Entity_Name (Prefix (Nam))
+ then
+ Decls :=
+ Build_Task_Image_Decls
+ (Loc, Nam, Etype (Prefix (Nam)));
+ else
+ Decls := Build_Task_Image_Decls (Loc, T, T);
+ end if;
+ end;
- -- 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
- Nam : constant Node_Id := Name (Parent (N));
-
- begin
- if Is_Entity_Name (Nam) then
- Decls :=
- 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)
- and then Is_Entity_Name (Prefix (Nam))
- then
- Decls :=
- Build_Task_Image_Decls (
- Loc, Nam, Etype (Prefix (Nam)));
- else
- Decls := Build_Task_Image_Decls (Loc, T, T);
- end if;
- end;
+ elsif Nkind (Parent (N)) = N_Object_Declaration then
+ Decls :=
+ Build_Task_Image_Decls (
+ Loc, Defining_Identifier (Parent (N)), T);
- elsif Nkind (Parent (N)) = N_Object_Declaration then
- Decls :=
- Build_Task_Image_Decls (
- Loc, Defining_Identifier (Parent (N)), T);
+ else
+ Decls := Build_Task_Image_Decls (Loc, T, T);
+ end if;
- else
- Decls := Build_Task_Image_Decls (Loc, T, T);
- end if;
+ Append_To (Args,
+ New_Reference_To
+ (Master_Id (Base_Type (Root_Type (PtrT))), Loc));
+ Append_To (Args, Make_Identifier (Loc, Name_uChain));
- Append_To (Args,
- New_Reference_To
- (Master_Id (Base_Type (Root_Type (PtrT))), Loc));
- Append_To (Args, Make_Identifier (Loc, Name_uChain));
+ Decl := Last (Decls);
+ Append_To (Args,
+ New_Occurrence_Of (Defining_Identifier (Decl), Loc));
- Decl := Last (Decls);
- 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;
+ end if;
- else
- Decls := No_List;
- end if;
+ -- Add discriminants if discriminated type
- -- Add discriminants if discriminated type
+ declare
+ Dis : Boolean := False;
+ Typ : Entity_Id;
+ begin
if Has_Discriminants (T) then
- Discr := First_Elmt (Discriminant_Constraint (T));
-
- while Present (Discr) loop
- Append (New_Copy (Elists.Node (Discr)), Args);
- Next_Elmt (Discr);
- end loop;
+ 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)));
+ Dis := True;
+ Typ := Full_View (T);
+ 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
- Append (New_Copy (Elists.Node (Discr)), Args);
+ 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);
+ -- 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.
- -- Here is the transformation:
- -- input: new T
- -- output: Temp : constant ptr_T := new T;
- -- Init (Temp.all, ...);
- -- <CTRL> Attach_To_Final_List (Finalizable (Temp.all));
- -- <CTRL> Initialize (Finalizable (Temp.all));
+ Set_Analyzed (N, True);
+ Nod := Relocate_Node (N);
- -- Here ptr_T is the pointer type for the allocator, and T
- -- is the subtype of the allocator.
+ -- Here is the transformation:
+ -- input: new T
+ -- output: Temp : constant ptr_T := new T;
+ -- Init (Temp.all, ...);
+ -- <CTRL> Attach_To_Final_List (Finalizable (Temp.all));
+ -- <CTRL> Initialize (Finalizable (Temp.all));
- Temp_Decl :=
- Make_Object_Declaration (Loc,
- Defining_Identifier => Temp,
- Constant_Present => True,
- Object_Definition => New_Reference_To (Temp_Type, Loc),
- Expression => Node);
+ -- Here ptr_T is the pointer type for the allocator, and is the
+ -- subtype of the allocator.
- Set_Assignment_OK (Temp_Decl);
+ Temp_Decl :=
+ Make_Object_Declaration (Loc,
+ Defining_Identifier => Temp,
+ Constant_Present => True,
+ Object_Definition => New_Reference_To (Temp_Type, Loc),
+ Expression => Nod);
- if Is_CPP_Class (T) then
- Set_Aliased_Present (Temp_Decl);
- end if;
+ Set_Assignment_OK (Temp_Decl);
+ Insert_Action (N, Temp_Decl, Suppress => All_Checks);
- Insert_Action (N, Temp_Decl, Suppress => All_Checks);
+ -- 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.
- -- Case of designated type is task or contains task
- -- 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;
- if Has_Task (T) then
- declare
- L : List_Id := New_List;
- Blk : Node_Id;
+ begin
+ Build_Task_Allocate_Block (L, Nod, Args);
+ Blk := Last (L);
- begin
- Build_Task_Allocate_Block (L, Node, Args);
- Blk := Last (L);
+ Insert_List_Before (First (Declarations (Blk)), Decls);
+ Insert_Actions (N, L);
+ end;
- 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),
+ Parameter_Associations => Args));
+ end if;
- else
- Insert_Action (N,
- Make_Procedure_Call_Statement (Loc,
- Name => New_Reference_To (Init, Loc),
- Parameter_Associations => Args));
- end if;
+ if Controlled_Type (T) then
- if Controlled_Type (T) then
+ -- Postpone the generation of a finalization call for the
+ -- current allocator if it acts as a coextension.
- -- 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.
+ if Is_Dynamic_Coextension (N) then
+ if No (Coextensions (N)) then
+ Set_Coextensions (N, New_Elmt_List);
+ end if;
- if Ekind (PtrT) = E_Anonymous_Access_Type then
- declare
- Acc : Entity_Id :=
- Make_Defining_Identifier (Loc,
- New_Internal_Name ('I'));
- begin
- Insert_Action (N,
- Make_Full_Type_Declaration (Loc,
- Defining_Identifier => Acc,
- Type_Definition =>
- Make_Access_To_Object_Definition (Loc,
- Subtype_Indication =>
- New_Occurrence_Of (T, Loc))));
-
- Build_Final_List (N, Acc);
- Flist := Find_Final_List (Acc);
- end;
+ Append_Elmt (New_Copy_Tree (Arg1), Coextensions (N));
+ else
+ Flist := Get_Allocator_Final_List (N, Base_Type (T), PtrT);
+
+ -- 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
- Flist := Find_Final_List (PtrT);
+ Attach_Level := Uint_2;
end if;
Insert_Actions (N,
Ref => New_Copy_Tree (Arg1),
Typ => T,
Flist_Ref => Flist,
- With_Attach => Make_Integer_Literal (Loc, 2)));
+ With_Attach => Make_Integer_Literal
+ (Loc, Attach_Level)));
end if;
+ end if;
- 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));
- end if;
+ Rewrite (N, New_Reference_To (Temp, Loc));
+ Analyze_And_Resolve (N, PtrT);
+ end if;
+ end;
- Analyze_And_Resolve (N, PtrT);
- 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
+ when RE_Not_Available =>
+ return;
end Expand_N_Allocator;
-----------------------
-- 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'));
Name => New_Occurrence_Of (Cnn, Sloc (Elsex)),
Expression => Relocate_Node (Elsex))));
+ Set_Assignment_OK (Name (First (Then_Statements (New_If))));
+ Set_Assignment_OK (Name (First (Else_Statements (New_If))));
+
if Present (Then_Actions (N)) then
Insert_List_Before
(First (Then_Statements (New_If)), Then_Actions (N));
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;
- -----------------
- -- Expand_N_In --
- -----------------
+ -----------------
+ -- Expand_N_In --
+ -----------------
+
+ procedure Expand_N_In (N : Node_Id) is
+ Loc : constant Source_Ptr := Sloc (N);
+ Rtyp : constant Entity_Id := Etype (N);
+ Lop : constant Node_Id := Left_Opnd (N);
+ 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
+ -- 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
+ 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 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.
+
+ 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.
+
+ 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);
- procedure Expand_N_In (N : Node_Id) is
- Loc : constant Source_Ptr := Sloc (N);
- Rtyp : constant Entity_Id := Etype (N);
+ return;
+ end if;
+ end;
- begin
- -- No expansion is required if we have an explicit range
+ -- For all other cases of an explicit range, nothing to be done
- if Nkind (Right_Opnd (N)) = N_Range then
return;
-- Here right operand is a subtype mark
else
declare
- Typ : Entity_Id := Etype (Right_Opnd (N));
- Obj : Node_Id := Left_Opnd (N);
- Cond : Node_Id := Empty;
- Is_Acc : Boolean := Is_Access_Type (Typ);
+ Typ : Entity_Id := Etype (Rop);
+ Is_Acc : constant Boolean := Is_Access_Type (Typ);
+ Obj : Node_Id := Lop;
+ Cond : Node_Id := Empty;
begin
Remove_Side_Effects (Obj);
-- For tagged type, do tagged membership operation
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).
- if not Java_VM then
+ -- 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 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.
elsif Is_Scalar_Type (Typ) then
- Rewrite (Right_Opnd (N),
+ Rewrite (Rop,
Make_Range (Loc,
Low_Bound =>
Make_Attribute_Reference (Loc,
Prefix => New_Reference_To (Typ, Loc))));
Analyze_And_Resolve (N, Rtyp);
return;
+
+ -- Ada 2005 (AI-216): Program_Error is raised when evaluating
+ -- a membership test if the subtype mark denotes a constrained
+ -- Unchecked_Union subtype and the expression lacks inferable
+ -- discriminants.
+
+ elsif Is_Unchecked_Union (Base_Type (Typ))
+ and then Is_Constrained (Typ)
+ and then not Has_Inferable_Discriminants (Lop)
+ then
+ Insert_Action (N,
+ Make_Raise_Program_Error (Loc,
+ Reason => PE_Unchecked_Union_Restriction));
+
+ -- Prevent Gigi from generating incorrect code by rewriting
+ -- the test as a standard False.
+
+ Rewrite (N,
+ New_Occurrence_Of (Standard_False, Loc));
+
+ return;
end if;
+ -- Here we have a non-scalar type
+
if Is_Acc then
Typ := Designated_Type (Typ);
end if;
elsif Is_Array_Type (Typ) then
- declare
+ Check_Subscripts : declare
function Construct_Attribute_Reference
- (E : Node_Id;
- Nam : Name_Id;
- Dim : Nat)
- return Node_Id;
+ (E : Node_Id;
+ Nam : Name_Id;
+ Dim : Nat) return Node_Id;
-- Build attribute reference E'Nam(Dim)
+ -----------------------------------
+ -- Construct_Attribute_Reference --
+ -----------------------------------
+
function Construct_Attribute_Reference
- (E : Node_Id;
- Nam : Name_Id;
- Dim : Nat)
- return Node_Id
+ (E : Node_Id;
+ Nam : Name_Id;
+ Dim : Nat) return Node_Id
is
begin
return
Make_Integer_Literal (Loc, Dim)));
end Construct_Attribute_Reference;
+ -- Start processing for Check_Subscripts
+
begin
for J in 1 .. Number_Dimensions (Typ) loop
Evolve_And_Then (Cond,
Make_Op_Eq (Loc,
Left_Opnd =>
Construct_Attribute_Reference
- (Duplicate_Subexpr (Obj), Name_First, J),
+ (Duplicate_Subexpr_No_Checks (Obj),
+ Name_First, J),
Right_Opnd =>
Construct_Attribute_Reference
(New_Occurrence_Of (Typ, Loc), Name_First, J)));
Make_Op_Eq (Loc,
Left_Opnd =>
Construct_Attribute_Reference
- (Duplicate_Subexpr (Obj), Name_Last, J),
+ (Duplicate_Subexpr_No_Checks (Obj),
+ Name_Last, J),
Right_Opnd =>
Construct_Attribute_Reference
(New_Occurrence_Of (Typ, Loc), Name_Last, J)));
end loop;
if Is_Acc then
- Cond := Make_Or_Else (Loc,
- Left_Opnd =>
- Make_Op_Eq (Loc,
- Left_Opnd => Obj,
- Right_Opnd => Make_Null (Loc)),
- Right_Opnd => Cond);
+ Cond :=
+ Make_Or_Else (Loc,
+ Left_Opnd =>
+ Make_Op_Eq (Loc,
+ Left_Opnd => Obj,
+ Right_Opnd => Make_Null (Loc)),
+ Right_Opnd => Cond);
end if;
Rewrite (N, Cond);
Analyze_And_Resolve (N, Rtyp);
- end;
+ end Check_Subscripts;
-- These are the cases where constraint checks may be
-- required, e.g. records with possible discriminants
-- 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;
+ -- Generate index and validity checks
+
+ Generate_Index_Checks (N);
+
if Validity_Checks_On and then Validity_Check_Subscripts then
Apply_Subscript_Validity_Checks (N);
end if;
-- convert it to a reference to the corresponding Packed_Array_Type.
-- We only want to do this for simple references, and not for:
- -- Left side of assignment (or prefix of left side of assignment)
+ -- Left side of assignment, or prefix of left side of assignment,
+ -- or prefix of the prefix, to handle packed arrays of packed arrays,
-- This case is handled in Exp_Ch5.Expand_N_Assignment_Statement
-- Renaming objects in renaming associations
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;
+ -- If the expression is an index of an indexed component,
+ -- it must be expanded regardless of context.
+
+ elsif Nkind (Parnt) = N_Indexed_Component
+ and then Child /= Prefix (Parnt)
+ then
+ Expand_Packed_Element_Reference (N);
+ return;
+
+ elsif Nkind (Parent (Parnt)) = N_Assignment_Statement
+ and then Name (Parent (Parnt)) = Parnt
+ then
+ return;
+
elsif Nkind (Parnt) = N_Attribute_Reference
and then Attribute_Name (Parnt) = Name_Read
and then Next (First (Expressions (Parnt))) = Child
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
+ -- tranformations in Expand_N_In).
+
+ Set_Comes_From_Source (N, Cfs);
+ Set_Comes_From_Source (Right_Opnd (N), Cfs);
+
+ -- Now analyze tranformed 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 (
Set_Etype (N, Typ);
end if;
+
+ exception
+ when RE_Not_Available =>
+ return;
end Expand_N_Null;
---------------------
-- Deal with software overflow checking
- if Software_Overflow_Checking
+ if not Backend_Overflow_Checks_On_Target
and then Is_Signed_Integer_Type (Etype (N))
and then Do_Overflow_Check (N)
then
- -- Software overflow checking expands abs (expr) into
+ -- The only case to worry about is when the argument is
+ -- equal to the largest negative number, so what we do is
+ -- to insert the check:
- -- (if expr >= 0 then expr else -expr)
+ -- [constraint_error when Expr = typ'Base'First]
-- with the usual Duplicate_Subexpr use coding for expr
- Rewrite (N,
- Make_Conditional_Expression (Loc,
- Expressions => New_List (
- Make_Op_Ge (Loc,
+ Insert_Action (N,
+ Make_Raise_Constraint_Error (Loc,
+ Condition =>
+ Make_Op_Eq (Loc,
Left_Opnd => Duplicate_Subexpr (Expr),
- Right_Opnd => Make_Integer_Literal (Loc, 0)),
-
- Duplicate_Subexpr (Expr),
-
- Make_Op_Minus (Loc,
- Right_Opnd => Duplicate_Subexpr (Expr)))));
-
- Analyze_And_Resolve (N);
+ Right_Opnd =>
+ Make_Attribute_Reference (Loc,
+ Prefix =>
+ New_Occurrence_Of (Base_Type (Etype (Expr)), Loc),
+ Attribute_Name => Name_First)),
+ Reason => CE_Overflow_Check_Failed));
+ end if;
-- Vax floating-point types case
- elsif Vax_Float (Etype (N)) then
+ if Vax_Float (Etype (N)) then
Expand_Vax_Arith (N);
end if;
end Expand_N_Op_Abs;
end if;
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)
-- Expand_N_Op_Concat --
------------------------
- procedure Expand_N_Op_Concat (N : Node_Id) is
+ Max_Available_String_Operands : Int := -1;
+ -- This is initialized the first time this routine is called. It records
+ -- a value of 0,2,3,4,5 depending on what Str_Concat_n procedures are
+ -- available in the run-time:
+ --
+ -- 0 None available
+ -- 2 RE_Str_Concat available, RE_Str_Concat_3 not available
+ -- 3 RE_Str_Concat/Concat_2 available, RE_Str_Concat_4 not available
+ -- 4 RE_Str_Concat/Concat_2/3 available, RE_Str_Concat_5 not available
+ -- 5 All routines including RE_Str_Concat_5 available
+
+ Char_Concat_Available : Boolean;
+ -- Records if the routines RE_Str_Concat_CC/CS/SC are available. True if
+ -- all three are available, False if any one of these is unavailable.
+ procedure Expand_N_Op_Concat (N : Node_Id) is
Opnds : List_Id;
-- List of operands to be concatenated
-- Component type of concatenation represented by Cnode
begin
+ -- Initialize global variables showing run-time status
+
+ if Max_Available_String_Operands < 1 then
+
+ -- In No_Run_Time mode, consider that no entities are available
+
+ -- This seems wrong, RTE_Available should return False for any entity
+ -- that is not in the special No_Run_Time list of allowed entities???
+
+ if No_Run_Time_Mode then
+ Max_Available_String_Operands := 0;
+
+ -- Otherwise see what routines are available and set max operand
+ -- count according to the highest count available in the run-time.
+
+ elsif 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;
+
+ Char_Concat_Available :=
+ not No_Run_Time_Mode
+ and then
+ RTE_Available (RE_Str_Concat_CC)
+ and then
+ RTE_Available (RE_Str_Concat_CS)
+ and then
+ RTE_Available (RE_Str_Concat_SC);
+ end if;
+
+ -- Ensure validity of both operands
+
Binary_Op_Validity_Checks (N);
-- If we are the left operand of a concatenation higher up the
Opnds := New_List (Left_Opnd (Cnode), Right_Opnd (Cnode));
Set_Parent (Opnds, N);
- -- The inner loop gathers concatenation operands
+ -- The inner loop gathers concatenation operands. We gather any
+ -- number of these in the non-string case, or if no concatenation
+ -- routines are available for string (since in that case we will
+ -- treat string like any other non-string case). Otherwise we only
+ -- gather as many operands as can be handled by the available
+ -- procedures in the run-time library (normally 5, but may be
+ -- less for the configurable run-time case).
Inner : while Cnode /= N
and then (Base_Type (Etype (Cnode)) /= Standard_String
or else
- List_Length (Opnds) < 5)
+ Max_Available_String_Operands = 0
+ or else
+ List_Length (Opnds) <
+ Max_Available_String_Operands)
and then Base_Type (Etype (Cnode)) =
Base_Type (Etype (Parent (Cnode)))
loop
Atyp := Base_Type (Etype (Cnode));
Ctyp := Base_Type (Component_Type (Etype (Cnode)));
- if List_Length (Opnds) > 2 or else Atyp /= Standard_String then
+ if (List_Length (Opnds) > 2 or else Atyp /= Standard_String)
+ or else not Char_Concat_Available
+ then
Opnd := First (Opnds);
loop
if Base_Type (Etype (Opnd)) = Ctyp then
-- Now call appropriate continuation routine
- if Atyp = Standard_String then
+ if Atyp = Standard_String
+ and then Max_Available_String_Operands > 0
+ then
Expand_Concatenate_String (Cnode, Opnds);
else
Expand_Concatenate_Other (Cnode, Opnds);
------------------------
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.
+
+ and then
+ (Esize (Ltyp) <= 32
+ or else Support_Long_Shifts_On_Target)
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;
Expand_Divide_Fixed_By_Fixed_Giving_Float (N);
end if;
- -- Mixed-mode operations can appear in a non-static universal
- -- context, in which case the integer argument must be converted
- -- explicitly.
+ -- Mixed-mode operations can appear in a non-static universal
+ -- context, in which case the integer argument must be converted
+ -- explicitly.
+
+ elsif Typ = Universal_Real
+ and then Is_Integer_Type (Rtyp)
+ then
+ Rewrite (Ropnd,
+ Convert_To (Universal_Real, Relocate_Node (Ropnd)));
+
+ Analyze_And_Resolve (Ropnd, Universal_Real);
+
+ elsif Typ = Universal_Real
+ and then Is_Integer_Type (Ltyp)
+ then
+ Rewrite (Lopnd,
+ Convert_To (Universal_Real, Relocate_Node (Lopnd)));
+
+ Analyze_And_Resolve (Lopnd, Universal_Real);
+
+ -- 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, 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;
+
+ --------------------
+ -- Expand_N_Op_Eq --
+ --------------------
+
+ procedure Expand_N_Op_Eq (N : Node_Id) is
+ Loc : constant Source_Ptr := Sloc (N);
+ Typ : constant Entity_Id := Etype (N);
+ Lhs : constant Node_Id := Left_Opnd (N);
+ Rhs : constant Node_Id := Right_Opnd (N);
+ Bodies : constant List_Id := New_List;
+ A_Typ : constant Entity_Id := Etype (Lhs);
+
+ Typl : Entity_Id := A_Typ;
+ Op_Name : Entity_Id;
+ Prim : Elmt_Id;
+
+ procedure Build_Equality_Call (Eq : Entity_Id);
+ -- If a constructed equality exists for the type or for its parent,
+ -- build and analyze call, adding conversions if the operation is
+ -- inherited.
+
+ function Has_Unconstrained_UU_Component (Typ : Node_Id) return Boolean;
+ -- Determines whether a type has a subcompoment of an unconstrained
+ -- Unchecked_Union subtype. Typ is a record type.
+
+ -------------------------
+ -- Build_Equality_Call --
+ -------------------------
+
+ procedure Build_Equality_Call (Eq : Entity_Id) is
+ Op_Type : constant Entity_Id := Etype (First_Formal (Eq));
+ L_Exp : Node_Id := Relocate_Node (Lhs);
+ R_Exp : Node_Id := Relocate_Node (Rhs);
+
+ begin
+ if Base_Type (Op_Type) /= Base_Type (A_Typ)
+ and then not Is_Class_Wide_Type (A_Typ)
+ then
+ L_Exp := OK_Convert_To (Op_Type, L_Exp);
+ R_Exp := OK_Convert_To (Op_Type, R_Exp);
+ end if;
+
+ -- If we have an Unchecked_Union, we need to add the inferred
+ -- discriminant values as actuals in the function call. At this
+ -- point, the expansion has determined that both operands have
+ -- inferable discriminants.
+
+ if Is_Unchecked_Union (Op_Type) then
+ declare
+ Lhs_Type : constant Node_Id := Etype (L_Exp);
+ Rhs_Type : constant Node_Id := Etype (R_Exp);
+ Lhs_Discr_Val : Node_Id;
+ Rhs_Discr_Val : Node_Id;
+
+ begin
+ -- Per-object constrained selected components require special
+ -- attention. If the enclosing scope of the component is an
+ -- 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.
+
+ -- type UU_Type (Discr : Integer := 0) is
+ -- . . .
+ -- end record;
+ -- pragma Unchecked_Union (UU_Type);
+
+ -- 1. Unchecked_Union enclosing record:
+
+ -- type Enclosing_UU_Type (Discr : Integer := 0) is record
+ -- . . .
+ -- Comp : UU_Type (Discr);
+ -- . . .
+ -- end Enclosing_UU_Type;
+ -- pragma Unchecked_Union (Enclosing_UU_Type);
+
+ -- Obj1 : Enclosing_UU_Type;
+ -- Obj2 : Enclosing_UU_Type (1);
+
+ -- [. . .] Obj1 = Obj2 [. . .]
+
+ -- Generated code:
+
+ -- if not (uu_typeEQ (obj1.comp, obj2.comp, a, b)) then
+
+ -- A and B are the formal parameters of the equality function
+ -- of Enclosing_UU_Type. The function always has two extra
+ -- formals to capture the inferred discriminant values.
+
+ -- 2. Non-Unchecked_Union enclosing record:
+
+ -- type
+ -- Enclosing_Non_UU_Type (Discr : Integer := 0)
+ -- is record
+ -- . . .
+ -- Comp : UU_Type (Discr);
+ -- . . .
+ -- end Enclosing_Non_UU_Type;
+
+ -- Obj1 : Enclosing_Non_UU_Type;
+ -- Obj2 : Enclosing_Non_UU_Type (1);
+
+ -- ... Obj1 = Obj2 ...
+
+ -- Generated code:
+
+ -- if not (uu_typeEQ (obj1.comp, obj2.comp,
+ -- obj1.discr, obj2.discr)) then
+
+ -- In this case we can directly reference the discriminants of
+ -- the enclosing record.
+
+ -- Lhs of equality
+
+ if Nkind (Lhs) = N_Selected_Component
+ and then Has_Per_Object_Constraint
+ (Entity (Selector_Name (Lhs)))
+ then
+ -- Enclosing record is an Unchecked_Union, use formal A
+
+ if Is_Unchecked_Union (Scope
+ (Entity (Selector_Name (Lhs))))
+ then
+ Lhs_Discr_Val :=
+ Make_Identifier (Loc,
+ Chars => Name_A);
+
+ -- Enclosing record is of a non-Unchecked_Union type, it is
+ -- possible to reference the discriminant.
+
+ else
+ Lhs_Discr_Val :=
+ Make_Selected_Component (Loc,
+ Prefix => Prefix (Lhs),
+ Selector_Name =>
+ New_Copy
+ (Get_Discriminant_Value
+ (First_Discriminant (Lhs_Type),
+ Lhs_Type,
+ Stored_Constraint (Lhs_Type))));
+ end if;
+
+ -- Comment needed here ???
+
+ else
+ -- Infer the discriminant value
+
+ Lhs_Discr_Val :=
+ 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)))
+ then
+ if Is_Unchecked_Union
+ (Scope (Entity (Selector_Name (Rhs))))
+ then
+ Rhs_Discr_Val :=
+ Make_Identifier (Loc,
+ Chars => Name_B);
+
+ else
+ Rhs_Discr_Val :=
+ Make_Selected_Component (Loc,
+ Prefix => Prefix (Rhs),
+ Selector_Name =>
+ New_Copy (Get_Discriminant_Value (
+ First_Discriminant (Rhs_Type),
+ Rhs_Type,
+ Stored_Constraint (Rhs_Type))));
+
+ end if;
+ else
+ Rhs_Discr_Val :=
+ New_Copy (Get_Discriminant_Value (
+ First_Discriminant (Rhs_Type),
+ Rhs_Type,
+ Stored_Constraint (Rhs_Type)));
+
+ end if;
+
+ Rewrite (N,
+ Make_Function_Call (Loc,
+ Name => New_Reference_To (Eq, Loc),
+ Parameter_Associations => New_List (
+ L_Exp,
+ R_Exp,
+ Lhs_Discr_Val,
+ Rhs_Discr_Val)));
+ end;
+
+ -- Normal case, not an unchecked union
+
+ else
+ Rewrite (N,
+ Make_Function_Call (Loc,
+ Name => New_Reference_To (Eq, Loc),
+ Parameter_Associations => New_List (L_Exp, R_Exp)));
+ end if;
+
+ Analyze_And_Resolve (N, Standard_Boolean, Suppress => All_Checks);
+ end Build_Equality_Call;
+
+ ------------------------------------
+ -- Has_Unconstrained_UU_Component --
+ ------------------------------------
+
+ function Has_Unconstrained_UU_Component
+ (Typ : Node_Id) return Boolean
+ is
+ Tdef : constant Node_Id :=
+ Type_Definition (Declaration_Node (Base_Type (Typ)));
+ Clist : Node_Id;
+ Vpart : Node_Id;
+
+ function Component_Is_Unconstrained_UU
+ (Comp : Node_Id) return Boolean;
+ -- Determines whether the subtype of the component is an
+ -- unconstrained Unchecked_Union.
+
+ function Variant_Is_Unconstrained_UU
+ (Variant : Node_Id) return Boolean;
+ -- Determines whether a component of the variant has an unconstrained
+ -- Unchecked_Union subtype.
+
+ -----------------------------------
+ -- Component_Is_Unconstrained_UU --
+ -----------------------------------
+
+ function Component_Is_Unconstrained_UU
+ (Comp : Node_Id) return Boolean
+ is
+ begin
+ if Nkind (Comp) /= N_Component_Declaration then
+ return False;
+ end if;
+
+ declare
+ Sindic : constant Node_Id :=
+ Subtype_Indication (Component_Definition (Comp));
+
+ begin
+ -- Unconstrained nominal type. In the case of a constraint
+ -- present, the node kind would have been N_Subtype_Indication.
+
+ if Nkind (Sindic) = N_Identifier then
+ return Is_Unchecked_Union (Base_Type (Etype (Sindic)));
+ end if;
+
+ return False;
+ end;
+ end Component_Is_Unconstrained_UU;
+
+ ---------------------------------
+ -- Variant_Is_Unconstrained_UU --
+ ---------------------------------
+
+ function Variant_Is_Unconstrained_UU
+ (Variant : Node_Id) return Boolean
+ is
+ Clist : constant Node_Id := Component_List (Variant);
+
+ begin
+ if Is_Empty_List (Component_Items (Clist)) then
+ return False;
+ end if;
+
+ -- We only need to test one component
+
+ declare
+ Comp : Node_Id := First (Component_Items (Clist));
+
+ begin
+ while Present (Comp) loop
+ if Component_Is_Unconstrained_UU (Comp) then
+ return True;
+ end if;
+
+ Next (Comp);
+ end loop;
+ end;
+
+ -- None of the components withing the variant were of
+ -- unconstrained Unchecked_Union type.
+
+ return False;
+ end Variant_Is_Unconstrained_UU;
+
+ -- Start of processing for Has_Unconstrained_UU_Component
+
+ begin
+ if Null_Present (Tdef) then
+ return False;
+ end if;
+
+ Clist := Component_List (Tdef);
+ Vpart := Variant_Part (Clist);
- elsif Typ = Universal_Real
- and then Is_Integer_Type (Rtyp)
- then
- Rewrite (Right_Opnd (N),
- Convert_To (Universal_Real, Relocate_Node (Right_Opnd (N))));
+ -- Inspect available components
- Analyze_And_Resolve (Right_Opnd (N), Universal_Real);
+ if Present (Component_Items (Clist)) then
+ declare
+ Comp : Node_Id := First (Component_Items (Clist));
- elsif Typ = Universal_Real
- and then Is_Integer_Type (Ltyp)
- then
- Rewrite (Left_Opnd (N),
- Convert_To (Universal_Real, Relocate_Node (Left_Opnd (N))));
+ begin
+ while Present (Comp) loop
- Analyze_And_Resolve (Left_Opnd (N), Universal_Real);
+ -- One component is sufficent
- -- Non-fixed point cases, do zero divide and overflow checks
+ if Component_Is_Unconstrained_UU (Comp) then
+ return True;
+ end if;
- elsif Is_Integer_Type (Typ) then
- Apply_Divide_Check (N);
- end if;
- end Expand_N_Op_Divide;
+ Next (Comp);
+ end loop;
+ end;
+ end if;
- --------------------
- -- Expand_N_Op_Eq --
- --------------------
+ -- Inspect available components withing variants
- procedure Expand_N_Op_Eq (N : Node_Id) is
- Loc : constant Source_Ptr := Sloc (N);
- Typ : constant Entity_Id := Etype (N);
- Lhs : constant Node_Id := Left_Opnd (N);
- Rhs : constant Node_Id := Right_Opnd (N);
- A_Typ : Entity_Id := Etype (Lhs);
- Typl : Entity_Id := A_Typ;
- Op_Name : Entity_Id;
- Prim : Elmt_Id;
- Bodies : List_Id := New_List;
+ if Present (Vpart) then
+ declare
+ Variant : Node_Id := First (Variants (Vpart));
- procedure Build_Equality_Call (Eq : Entity_Id);
- -- If a constructed equality exists for the type or for its parent,
- -- build and analyze call, adding conversions if the operation is
- -- inherited.
+ begin
+ while Present (Variant) loop
- -------------------------
- -- Build_Equality_Call --
- -------------------------
+ -- One component within a variant is sufficent
- procedure Build_Equality_Call (Eq : Entity_Id) is
- Op_Type : constant Entity_Id := Etype (First_Formal (Eq));
- L_Exp : Node_Id := Relocate_Node (Lhs);
- R_Exp : Node_Id := Relocate_Node (Rhs);
+ if Variant_Is_Unconstrained_UU (Variant) then
+ return True;
+ end if;
- begin
- if Base_Type (Op_Type) /= Base_Type (A_Typ)
- and then not Is_Class_Wide_Type (A_Typ)
- then
- L_Exp := OK_Convert_To (Op_Type, L_Exp);
- R_Exp := OK_Convert_To (Op_Type, R_Exp);
+ Next (Variant);
+ end loop;
+ end;
end if;
- Rewrite (N,
- Make_Function_Call (Loc,
- Name => New_Reference_To (Eq, Loc),
- Parameter_Associations => New_List (L_Exp, R_Exp)));
+ -- Neither the available components, nor the components inside the
+ -- variant parts were of an unconstrained Unchecked_Union subtype.
- Analyze_And_Resolve (N, Standard_Boolean, Suppress => All_Checks);
- end Build_Equality_Call;
+ return False;
+ end Has_Unconstrained_UU_Component;
-- Start of processing for Expand_N_Op_Eq
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
- -- Packed case
+ -- 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 Is_Bit_Packed_Array (Typl) then
- Expand_Packed_Eq (N);
+ if Validity_Check_Operands
+ and then not Is_Known_Valid (Component_Type (Typl))
+ then
+ declare
+ Save_Force_Validity_Checks : constant Boolean :=
+ Force_Validity_Checks;
+ begin
+ Force_Validity_Checks := True;
+ Rewrite (N,
+ Expand_Array_Equality
+ (N,
+ Relocate_Node (Lhs),
+ Relocate_Node (Rhs),
+ Bodies,
+ Typl));
+ Insert_Actions (N, Bodies);
+ Analyze_And_Resolve (N, Standard_Boolean);
+ Force_Validity_Checks := Save_Force_Validity_Checks;
+ end;
+
+ -- Packed case where both operands are known aligned
- -- 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.
+ 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);
- -- However, we never use block bit comparison in No_Run_Time mode,
- -- since this may result in a call to a run time routine
+ -- 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 No_Run_Time
+ 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;
else
Rewrite (N,
- Expand_Array_Equality (N, Typl, A_Typ,
- Relocate_Node (Lhs), Relocate_Node (Rhs), Bodies));
-
+ Expand_Array_Equality
+ (N,
+ Relocate_Node (Lhs),
+ Relocate_Node (Rhs),
+ Bodies,
+ Typl));
Insert_Actions (N, Bodies, Suppress => All_Checks);
Analyze_And_Resolve (N, Standard_Boolean, Suppress => All_Checks);
end if;
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.
and then Is_Derived_Type (A_Typ)
and then No (Full_View (A_Typ))
then
+ -- Search for equality operation, checking that the
+ -- operands have the same type. Note that we must find
+ -- a matching entry, or something is very wrong!
+
Prim := First_Elmt (Collect_Primitive_Operations (A_Typ));
- while Chars (Node (Prim)) /= Name_Op_Eq loop
+ while Present (Prim) loop
+ exit when Chars (Node (Prim)) = Name_Op_Eq
+ and then Etype (First_Formal (Node (Prim))) =
+ Etype (Next_Formal (First_Formal (Node (Prim))))
+ and then
+ Base_Type (Etype (Node (Prim))) = Standard_Boolean;
+
Next_Elmt (Prim);
- pragma Assert (Present (Prim));
end loop;
+ pragma Assert (Present (Prim));
Op_Name := Node (Prim);
+
+ -- Find the type's predefined equality or an overriding
+ -- user-defined equality. The reason for not simply calling
+ -- Find_Prim_Op here is that there may be a user-defined
+ -- overloaded equality op that precedes the equality that
+ -- we want, so we have to explicitly search (e.g., there
+ -- could be an equality with two different parameter types).
+
else
- Op_Name := Find_Prim_Op (Typl, Name_Op_Eq);
+ if Is_Class_Wide_Type (Typl) then
+ Typl := Root_Type (Typl);
+ 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))) =
+ Etype (Next_Formal (First_Formal (Node (Prim))))
+ and then
+ Base_Type (Etype (Node (Prim))) = Standard_Boolean;
+
+ Next_Elmt (Prim);
+ end loop;
+
+ pragma Assert (Present (Prim));
+ Op_Name := Node (Prim);
end if;
Build_Equality_Call (Op_Name);
+ -- Ada 2005 (AI-216): Program_Error is raised when evaluating the
+ -- predefined equality operator for a type which has a subcomponent
+ -- of an Unchecked_Union type whose nominal subtype is unconstrained.
+
+ elsif Has_Unconstrained_UU_Component (Typl) then
+ Insert_Action (N,
+ Make_Raise_Program_Error (Loc,
+ Reason => PE_Unchecked_Union_Restriction));
+
+ -- Prevent Gigi from generating incorrect code by rewriting the
+ -- equality as a standard False.
+
+ Rewrite (N,
+ New_Occurrence_Of (Standard_False, Loc));
+
+ elsif Is_Unchecked_Union (Typl) then
+
+ -- If we can infer the discriminants of the operands, we make a
+ -- call to the TSS equality function.
+
+ if Has_Inferable_Discriminants (Lhs)
+ and then
+ Has_Inferable_Discriminants (Rhs)
+ then
+ Build_Equality_Call
+ (TSS (Root_Type (Typl), TSS_Composite_Equality));
+
+ else
+ -- Ada 2005 (AI-216): Program_Error is raised when evaluating
+ -- the predefined equality operator for an Unchecked_Union type
+ -- if either of the operands lack inferable discriminants.
+
+ Insert_Action (N,
+ Make_Raise_Program_Error (Loc,
+ Reason => PE_Unchecked_Union_Restriction));
+
+ -- Prevent Gigi from generating incorrect code by rewriting
+ -- the equality as a standard False.
+
+ Rewrite (N,
+ New_Occurrence_Of (Standard_False, Loc));
+
+ end if;
+
-- If a type support function is present (for complex cases), use it
- elsif Present (TSS (Root_Type (Typl), Name_uEquality)) then
- Build_Equality_Call (TSS (Root_Type (Typl), Name_uEquality));
+ elsif Present (TSS (Root_Type (Typl), TSS_Composite_Equality)) then
+ Build_Equality_Call
+ (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
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;
Typ : constant Entity_Id := Etype (N);
Rtyp : constant Entity_Id := Root_Type (Typ);
Base : constant Node_Id := Relocate_Node (Left_Opnd (N));
+ Bastyp : constant Node_Id := Etype (Base);
Exp : constant Node_Id := Relocate_Node (Right_Opnd (N));
Exptyp : constant Entity_Id := Etype (Exp);
Ovflo : constant Boolean := Do_Overflow_Check (N);
Temp : Node_Id;
Rent : RE_Id;
Ent : Entity_Id;
+ Etyp : Entity_Id;
begin
Binary_Op_Validity_Checks (N);
- -- At this point the exponentiation must be dynamic since the static
- -- case has already been folded after Resolve by Eval_Op_Expon.
+ -- If either operand is of a private type, then we have the use of
+ -- an intrinsic operator, and we get rid of the privateness, by using
+ -- root types of underlying types for the actual operation. Otherwise
+ -- the private types will cause trouble if we expand multiplications
+ -- or shifts etc. We also do this transformation if the result type
+ -- is different from the base type.
+
+ if Is_Private_Type (Etype (Base))
+ or else
+ Is_Private_Type (Typ)
+ or else
+ Is_Private_Type (Exptyp)
+ or else
+ Rtyp /= Root_Type (Bastyp)
+ then
+ declare
+ Bt : constant Entity_Id := Root_Type (Underlying_Type (Bastyp));
+ Et : constant Entity_Id := Root_Type (Underlying_Type (Exptyp));
+
+ begin
+ Rewrite (N,
+ Unchecked_Convert_To (Typ,
+ Make_Op_Expon (Loc,
+ Left_Opnd => Unchecked_Convert_To (Bt, Base),
+ Right_Opnd => Unchecked_Convert_To (Et, Exp))));
+ Analyze_And_Resolve (N, Typ);
+ return;
+ end;
+ end if;
- -- Test for case of literal right argument
+ -- Test for case of known right argument
if Compile_Time_Known_Value (Exp) then
Expv := Expr_Value (Exp);
Xnode :=
Make_Op_Multiply (Loc,
Left_Opnd => Duplicate_Subexpr (Base),
- Right_Opnd => Duplicate_Subexpr (Base));
+ Right_Opnd => Duplicate_Subexpr_No_Checks (Base));
-- X ** 3 = X * X * X
Left_Opnd =>
Make_Op_Multiply (Loc,
Left_Opnd => Duplicate_Subexpr (Base),
- Right_Opnd => Duplicate_Subexpr (Base)),
- Right_Opnd => Duplicate_Subexpr (Base));
+ Right_Opnd => Duplicate_Subexpr_No_Checks (Base)),
+ Right_Opnd => Duplicate_Subexpr_No_Checks (Base));
-- X ** 4 ->
-- En : constant base'type := base * base;
Expression =>
Make_Op_Multiply (Loc,
Left_Opnd => Duplicate_Subexpr (Base),
- Right_Opnd => Duplicate_Subexpr (Base)))));
+ Right_Opnd => Duplicate_Subexpr_No_Checks (Base)))));
Xnode :=
Make_Op_Multiply (Loc,
-- Case of (2 ** expression) appearing as an argument of an integer
-- multiplication, or as the right argument of a division of a non-
- -- negative integer. In such cases we lave the node untouched, setting
+ -- negative integer. In such cases we leave the node untouched, setting
-- the flag Is_Natural_Power_Of_2_for_Shift set, then the expansion
-- of the higher level node converts it into a shift.
end;
end if;
- -- Fall through if exponentiation must be done using a runtime routine.
+ -- Fall through if exponentiation must be done using a runtime routine
- -- First deal with modular case.
+ -- First deal with modular case
if Is_Modular_Integer_Type (Rtyp) then
-- to the base type.
if Non_Binary_Modulus (Rtyp) then
-
Rewrite (N,
Convert_To (Typ,
Make_Function_Call (Loc,
Analyze_And_Resolve (N, Typ);
return;
- -- Signed integer cases
-
- elsif Rtyp = Base_Type (Standard_Integer) then
- if Ovflo then
- Rent := RE_Exp_Integer;
- else
- Rent := RE_Exn_Integer;
- end if;
-
- elsif Rtyp = Base_Type (Standard_Short_Integer) then
- if Ovflo then
- Rent := RE_Exp_Short_Integer;
- else
- Rent := RE_Exn_Short_Integer;
- end if;
-
- elsif Rtyp = Base_Type (Standard_Short_Short_Integer) then
- if Ovflo then
- Rent := RE_Exp_Short_Short_Integer;
- else
- Rent := RE_Exn_Short_Short_Integer;
- end if;
+ -- 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 when a certified run time is required.
- elsif Rtyp = Base_Type (Standard_Long_Integer) then
- if Ovflo then
- Rent := RE_Exp_Long_Integer;
- else
- Rent := RE_Exn_Long_Integer;
- end if;
+ -- 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 omitting checks on many machines.
- elsif (Rtyp = Base_Type (Standard_Long_Long_Integer)
- or else Rtyp = Universal_Integer)
+ elsif Rtyp = Base_Type (Standard_Long_Long_Integer)
+ or else (Rtyp = Base_Type (Standard_Long_Integer)
+ and then
+ Esize (Standard_Long_Integer) > Esize (Standard_Integer))
+ or else (Rtyp = Universal_Integer)
then
+ Etyp := Standard_Long_Long_Integer;
+
if Ovflo then
Rent := RE_Exp_Long_Long_Integer;
else
Rent := RE_Exn_Long_Long_Integer;
end if;
- -- Floating-point cases
-
- elsif Rtyp = Standard_Float then
- if Ovflo then
- Rent := RE_Exp_Float;
- else
- Rent := RE_Exn_Float;
- end if;
+ elsif Is_Signed_Integer_Type (Rtyp) then
+ Etyp := Standard_Integer;
- elsif Rtyp = Standard_Short_Float then
if Ovflo then
- Rent := RE_Exp_Short_Float;
+ Rent := RE_Exp_Integer;
else
- Rent := RE_Exn_Short_Float;
+ Rent := RE_Exn_Integer;
end if;
- elsif Rtyp = Standard_Long_Float then
- if Ovflo then
- Rent := RE_Exp_Long_Float;
- else
- Rent := RE_Exn_Long_Float;
- end if;
+ -- Floating-point cases, always done using Long_Long_Float. We do not
+ -- need separate routines for the overflow case here, since in the case
+ -- of floating-point, we generate infinities anyway as a rule (either
+ -- that or we automatically trap overflow), and if there is an infinity
+ -- generated and a range check is required, the check will fail anyway.
else
- pragma Assert
- (Rtyp = Standard_Long_Long_Float or else Rtyp = Universal_Real);
-
- if Ovflo then
- Rent := RE_Exp_Long_Long_Float;
- else
- Rent := RE_Exn_Long_Long_Float;
- end if;
+ pragma Assert (Is_Floating_Point_Type (Rtyp));
+ Etyp := Standard_Long_Long_Float;
+ Rent := RE_Exn_Long_Long_Float;
end if;
-- Common processing for integer cases and floating-point cases.
- -- If we are in the base type, we can call runtime routine directly
+ -- If we are in the right type, we can call runtime routine directly
- if Typ = Rtyp
+ if Typ = Etyp
and then Rtyp /= Universal_Integer
and then Rtyp /= Universal_Real
then
Parameter_Associations => New_List (Base, Exp)));
-- Otherwise we have to introduce conversions (conversions are also
- -- required in the universal cases, since the runtime routine was
- -- typed using the largest integer or real case.
+ -- required in the universal cases, since the runtime routine is
+ -- typed using one of the standard types.
else
Rewrite (N,
Make_Function_Call (Loc,
Name => New_Reference_To (RTE (Rent), Loc),
Parameter_Associations => New_List (
- Convert_To (Rtyp, Base),
+ Convert_To (Etyp, Base),
Exp))));
end if;
Analyze_And_Resolve (N, Typ);
return;
+ exception
+ when RE_Not_Available =>
+ return;
end Expand_N_Op_Expon;
--------------------
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;
-----------------------
begin
Unary_Op_Validity_Checks (N);
- if Software_Overflow_Checking
+ if not Backend_Overflow_Checks_On_Target
and then Is_Signed_Integer_Type (Etype (N))
and then Do_Overflow_Check (N)
then
procedure Expand_N_Op_Mod (N : Node_Id) is
Loc : constant Source_Ptr := Sloc (N);
- T : constant Entity_Id := Etype (N);
+ Typ : constant Entity_Id := Etype (N);
Left : constant Node_Id := Left_Opnd (N);
Right : constant Node_Id := Right_Opnd (N);
DOC : constant Boolean := Do_Overflow_Check (N);
Rhi : Uint;
ROK : Boolean;
+ pragma Warnings (Off, Lhi);
+
begin
Binary_Op_Validity_Checks (N);
-- instance and is epsilon more efficient.
Set_Entity (N, Standard_Entity (S_Op_Rem));
- Set_Etype (N, T);
+ Set_Etype (N, Typ);
Set_Do_Overflow_Check (N, DOC);
Set_Do_Division_Check (N, DDC);
Expand_N_Op_Rem (N);
Apply_Divide_Check (N);
end if;
+ -- Apply optimization x mod 1 = 0. We don't really need that with
+ -- gcc, but it is useful with other back ends (e.g. AAMP), and is
+ -- certainly harmless.
+
+ if Is_Integer_Type (Etype (N))
+ and then Compile_Time_Known_Value (Right)
+ and then Expr_Value (Right) = Uint_1
+ then
+ Rewrite (N, Make_Integer_Literal (Loc, 0));
+ Analyze_And_Resolve (N, Typ);
+ return;
+ end if;
+
-- Deal with annoying case of largest negative number remainder
-- minus one. Gigi does not handle this case correctly, because
-- it generates a divide instruction which may trap in this case.
-- then the mod value is always 0, and we can just ignore the
-- left operand completely in this case.
- LLB := Expr_Value (Type_Low_Bound (Base_Type (Etype (Left))));
+ -- The operand type may be private (e.g. in the expansion of an
+ -- an intrinsic operation) so we must use the underlying type to
+ -- get the bounds, and convert the literals explicitly.
+
+ LLB :=
+ Expr_Value
+ (Type_Low_Bound (Base_Type (Underlying_Type (Etype (Left)))));
if ((not ROK) or else (Rlo <= (-1) and then (-1) <= Rhi))
and then
Make_Op_Eq (Loc,
Left_Opnd => Duplicate_Subexpr (Right),
Right_Opnd =>
- Make_Integer_Literal (Loc, -1)),
- Make_Integer_Literal (Loc, Uint_0),
+ Unchecked_Convert_To (Typ,
+ Make_Integer_Literal (Loc, -1))),
+ Unchecked_Convert_To (Typ,
+ Make_Integer_Literal (Loc, Uint_0)),
Relocate_Node (N))));
Set_Analyzed (Next (Next (First (Expressions (N)))));
- Analyze_And_Resolve (N, T);
+ Analyze_And_Resolve (N, Typ);
end if;
end if;
end Expand_N_Op_Mod;
Loc : constant Source_Ptr := Sloc (N);
Lop : constant Node_Id := Left_Opnd (N);
Rop : constant Node_Id := Right_Opnd (N);
+
+ Lp2 : constant Boolean :=
+ Nkind (Lop) = N_Op_Expon
+ and then Is_Power_Of_2_For_Shift (Lop);
+
+ Rp2 : constant Boolean :=
+ Nkind (Rop) = N_Op_Expon
+ and then Is_Power_Of_2_For_Shift (Rop);
+
Ltyp : constant Entity_Id := Etype (Lop);
Rtyp : constant Entity_Id := Etype (Rop);
Typ : Entity_Id := Etype (N);
-- N * 0 = 0 * N = 0 for integer types
- if (Compile_Time_Known_Value (Right_Opnd (N))
- and then Expr_Value (Right_Opnd (N)) = Uint_0)
+ if (Compile_Time_Known_Value (Rop)
+ and then Expr_Value (Rop) = Uint_0)
or else
- (Compile_Time_Known_Value (Left_Opnd (N))
- and then Expr_Value (Left_Opnd (N)) = Uint_0)
+ (Compile_Time_Known_Value (Lop)
+ and then Expr_Value (Lop) = Uint_0)
then
Rewrite (N, Make_Integer_Literal (Loc, Uint_0));
Analyze_And_Resolve (N, Typ);
-- N * 1 = 1 * N = N for integer types
- if Compile_Time_Known_Value (Right_Opnd (N))
- and then Expr_Value (Right_Opnd (N)) = Uint_1
+ -- This optimisation is not done if we are going to
+ -- rewrite the product 1 * 2 ** N to a shift.
+
+ if Compile_Time_Known_Value (Rop)
+ and then Expr_Value (Rop) = Uint_1
+ and then not Lp2
then
- Rewrite (N, Left_Opnd (N));
+ Rewrite (N, Lop);
return;
- elsif Compile_Time_Known_Value (Left_Opnd (N))
- and then Expr_Value (Left_Opnd (N)) = Uint_1
+ elsif Compile_Time_Known_Value (Lop)
+ and then Expr_Value (Lop) = Uint_1
+ and then not Rp2
then
- Rewrite (N, Right_Opnd (N));
+ Rewrite (N, Rop);
return;
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.
- if Nkind (Rop) = N_Op_Expon
- and then Is_Power_Of_2_For_Shift (Rop)
- then
- if Nkind (Lop) = N_Op_Expon
- and then Is_Power_Of_2_For_Shift (Lop)
- then
+ if Rp2 then
+ if Lp2 then
- -- convert 2 ** A * 2 ** B into 2 ** (A + B)
+ -- Convert 2 ** A * 2 ** B into 2 ** (A + B)
Rewrite (N,
Make_Op_Expon (Loc,
-- Same processing for the operands the other way round
- elsif Nkind (Lop) = N_Op_Expon
- and then Is_Power_Of_2_For_Shift (Lop)
- then
+ elsif Lp2 then
Rewrite (N,
Make_Op_Shift_Left (Loc,
Left_Opnd => Rop,
-- Non-fixed point cases, check software overflow checking required
- elsif Is_Signed_Integer_Type (Etype (N)) then
- Apply_Arithmetic_Overflow_Check (N);
- end if;
- end Expand_N_Op_Multiply;
+ 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 --
+ --------------------
+
+ procedure Expand_N_Op_Ne (N : Node_Id) is
+ Typ : constant Entity_Id := Etype (Left_Opnd (N));
+
+ begin
+ -- Case of elementary type with standard operator
+
+ if Is_Elementary_Type (Typ)
+ and then Sloc (Entity (N)) = Standard_Location
+ then
+ Binary_Op_Validity_Checks (N);
+
+ -- Boolean types (requiring handling of non-standard case)
+
+ 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;
+
+ 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.
- --------------------
- -- Expand_N_Op_Ne --
- --------------------
+ else
+ declare
+ Loc : constant Source_Ptr := Sloc (N);
+ Neg : Node_Id;
+ Ne : constant Entity_Id := Entity (N);
- -- 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.
+ begin
+ Binary_Op_Validity_Checks (N);
- procedure Expand_N_Op_Ne (N : Node_Id) is
- Loc : constant Source_Ptr := Sloc (N);
- Neg : Node_Id;
- Ne : constant Entity_Id := Entity (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);
- begin
- Binary_Op_Validity_Checks (N);
+ if Scope (Ne) /= Standard_Standard then
+ Set_Entity (Right_Opnd (Neg), Corresponding_Equality (Ne));
+ end if;
- 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);
+ -- 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 Scope (Ne) /= Standard_Standard then
- Set_Entity (Right_Opnd (Neg), Corresponding_Equality (Ne));
+ 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;
-
- Rewrite (N, Neg);
- Analyze_And_Resolve (N, Standard_Boolean);
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;
- -- Case of array operand which is not bit-packed
+ -- Case of array operand which is not bit-packed. If the context is
+ -- a safe assignment, call in-place operation, If context is a larger
+ -- boolean expression in the context of a safe assignment, expansion is
+ -- done by enclosing operation.
Opnd := Relocate_Node (Right_Opnd (N));
Convert_To_Actual_Subtype (Opnd);
Arr := Etype (Opnd);
Ensure_Defined (Arr, N);
+ 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
+
+ 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))
+ then
+ Build_Boolean_Array_Proc_Call (Parent (N), Opnd, Empty);
+ return;
+ end if;
+
+ elsif Nkind (Parent (N)) in N_Binary_Op
+ and then Nkind (Parent (Parent (N))) = N_Assignment_Statement
+ then
+ declare
+ Op1 : constant Node_Id := Left_Opnd (Parent (N));
+ Op2 : constant Node_Id := Right_Opnd (Parent (N));
+ Lhs : constant Node_Id := Name (Parent (Parent (N)));
+
+ begin
+ if Safe_In_Place_Array_Op (Lhs, Op1, Op2) then
+ if N = Op1
+ and then Nkind (Op2) = N_Op_Not
+ then
+ -- (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
+
+ return;
+ end if;
+ end if;
+ end;
+ end if;
+
A := Make_Defining_Identifier (Loc, Name_uA);
B := Make_Defining_Identifier (Loc, Name_uB);
J := Make_Defining_Identifier (Loc, Name_uJ);
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)))))));
procedure Expand_N_Op_Rem (N : Node_Id) is
Loc : constant Source_Ptr := Sloc (N);
+ Typ : constant Entity_Id := Etype (N);
Left : constant Node_Id := Left_Opnd (N);
Right : constant Node_Id := Right_Opnd (N);
Rlo : Uint;
Rhi : Uint;
ROK : Boolean;
- Typ : Entity_Id;
+
+ pragma Warnings (Off, Lhi);
begin
Binary_Op_Validity_Checks (N);
Apply_Divide_Check (N);
end if;
+ -- Apply optimization x rem 1 = 0. We don't really need that with
+ -- gcc, but it is useful with other back ends (e.g. AAMP), and is
+ -- certainly harmless.
+
+ if Is_Integer_Type (Etype (N))
+ and then Compile_Time_Known_Value (Right)
+ and then Expr_Value (Right) = Uint_1
+ then
+ Rewrite (N, Make_Integer_Literal (Loc, 0));
+ Analyze_And_Resolve (N, Typ);
+ return;
+ end if;
+
-- Deal with annoying case of largest negative number remainder
-- minus one. Gigi does not handle this case correctly, because
-- it generates a divide instruction which may trap in this case.
Determine_Range (Right, ROK, Rlo, Rhi);
Determine_Range (Left, LOK, Llo, Lhi);
- LLB := Expr_Value (Type_Low_Bound (Base_Type (Etype (Left))));
- Typ := Etype (N);
+
+ -- The operand type may be private (e.g. in the expansion of an
+ -- an intrinsic operation) so we must use the underlying type to
+ -- get the bounds, and convert the literals explicitly.
+
+ LLB :=
+ Expr_Value
+ (Type_Low_Bound (Base_Type (Underlying_Type (Etype (Left)))));
+
+ -- Now perform the test, generating code only if needed
if ((not ROK) or else (Rlo <= (-1) and then (-1) <= Rhi))
and then
Make_Op_Eq (Loc,
Left_Opnd => Duplicate_Subexpr (Right),
Right_Opnd =>
- Make_Integer_Literal (Loc, -1)),
+ Unchecked_Convert_To (Typ,
+ Make_Integer_Literal (Loc, -1))),
- Make_Integer_Literal (Loc, Uint_0),
+ Unchecked_Convert_To (Typ,
+ Make_Integer_Literal (Loc, Uint_0)),
Relocate_Node (N))));
Adjust_Condition (Left);
Adjust_Condition (Right);
Set_Etype (N, Standard_Boolean);
+ end if;
-- Check for cases of left argument is True or False
- elsif Nkind (Left) = N_Identifier then
+ if Nkind (Left) = N_Identifier then
-- If left argument is False, change (False or else Right) to Right.
-- Any actions associated with Right will be executed unconditionally
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;
Loc : constant Source_Ptr := Sloc (N);
Par : constant Node_Id := Parent (N);
P : constant Node_Id := Prefix (N);
+ Ptyp : Entity_Id := Underlying_Type (Etype (P));
Disc : Entity_Id;
- Ptyp : Entity_Id := Underlying_Type (Etype (P));
New_N : Node_Id;
+ Dcon : Elmt_Id;
function In_Left_Hand_Side (Comp : Node_Id) return Boolean;
-- Gigi needs a temporary for prefixes that depend on a discriminant,
-- unless the context of an assignment can provide size information.
+ -- Don't we have a general routine that does this???
+
+ -----------------------
+ -- In_Left_Hand_Side --
+ -----------------------
function In_Left_Hand_Side (Comp : Node_Id) return Boolean is
begin
- return
- (Nkind (Parent (Comp)) = N_Assignment_Statement
- and then Comp = Name (Parent (Comp)))
- or else
- (Present (Parent (Comp))
- and then Nkind (Parent (Comp)) in N_Subexpr
- and then In_Left_Hand_Side (Parent (Comp)));
+ return (Nkind (Parent (Comp)) = N_Assignment_Statement
+ and then Comp = Name (Parent (Comp)))
+ or else (Present (Parent (Comp))
+ and then Nkind (Parent (Comp)) in N_Subexpr
+ and then In_Left_Hand_Side (Parent (Comp)));
end In_Left_Hand_Side;
+ -- Start of processing for Expand_N_Selected_Component
+
begin
+ -- Insert explicit dereference if required
+
+ if Is_Access_Type (Ptyp) then
+ Insert_Explicit_Dereference (P);
+ Analyze_And_Resolve (P, Designated_Type (Ptyp));
+
+ if Ekind (Etype (P)) = E_Private_Subtype
+ and then Is_For_Access_Subtype (Etype (P))
+ then
+ Set_Etype (P, Base_Type (Etype (P)));
+ end if;
+
+ Ptyp := Etype (P);
+ end if;
+
+ -- Deal with discriminant check required
+
if Do_Discriminant_Check (N) then
-- Present the discrminant checking function to the backend,
Add_Inlined_Body
(Discriminant_Checking_Func
(Original_Record_Component (Entity (Selector_Name (N)))));
- end if;
- -- Insert explicit dereference call for the checked storage pool case
+ -- Now reset the flag and generate the call
- if Is_Access_Type (Ptyp) then
- Insert_Dereference_Action (P);
- return;
+ Set_Do_Discriminant_Check (N, False);
+ Generate_Discriminant_Check (N);
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 known at the point the prefix is analyzed. If the conversion
- -- is the target of an assignment, we cannot force the evaluation, of
- -- course.
+ -- 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
+ -- known at the point the prefix is analyzed. If the conversion is the
+ -- target of an assignment, then we cannot force the evaluation.
if Nkind (Prefix (N)) = N_Unchecked_Type_Conversion
and then Has_Discriminants (Etype (N))
if Ekind (Entity (Selector_Name (N))) = E_Discriminant then
-- If the selector is a discriminant of a constrained record type,
- -- rewrite the expression with the actual value of the discriminant.
- -- Don't do this on the left hand of an assignment statement (this
- -- happens in generated code, and means we really want to set it!)
- -- We also only do this optimization for discrete types, and not
- -- for access types (access discriminants get us into trouble!)
- -- We also do not expand the prefix of an attribute or the
- -- operand of an object renaming declaration.
+ -- we may be able to rewrite the expression with the actual value
+ -- of the discriminant, a useful optimization in some cases.
if Is_Record_Type (Ptyp)
and then Has_Discriminants (Ptyp)
and then Is_Constrained (Ptyp)
- and then Is_Discrete_Type (Etype (N))
- and then (Nkind (Par) /= N_Assignment_Statement
- or else Name (Par) /= N)
- and then (Nkind (Par) /= N_Attribute_Reference
- or else Prefix (Par) /= N)
- and then not Is_Renamed_Object (N)
then
- declare
- D : Entity_Id;
- E : Elmt_Id;
+ -- Do this optimization for discrete types only, and not for
+ -- access types (access discriminants get us into trouble!)
- begin
- D := First_Discriminant (Ptyp);
- E := First_Elmt (Discriminant_Constraint (Ptyp));
+ if not Is_Discrete_Type (Etype (N)) then
+ null;
+
+ -- Don't do this on the left hand of an assignment statement.
+ -- Normally one would think that references like this would
+ -- not occur, but they do in generated code, and mean that
+ -- we really do want to assign the discriminant!
+
+ elsif Nkind (Par) = N_Assignment_Statement
+ and then Name (Par) = N
+ then
+ null;
+
+ -- Don't do this optimization for the prefix of an attribute
+ -- or the operand of an object renaming declaration since these
+ -- are contexts where we do not want the value anyway.
+
+ elsif (Nkind (Par) = N_Attribute_Reference
+ and then Prefix (Par) = N)
+ or else Is_Renamed_Object (N)
+ then
+ null;
+
+ -- Don't do this optimization if we are within the code for a
+ -- discriminant check, since the whole point of such a check may
+ -- be to verify the condition on which the code below depends!
+
+ elsif Is_In_Discriminant_Check (N) then
+ null;
+
+ -- Green light to see if we can do the optimization. There is
+ -- still one condition that inhibits the optimization below
+ -- but now is the time to check the particular discriminant.
+
+ else
+ -- Loop through discriminants to find the matching
+ -- discriminant constraint to see if we can copy it.
+
+ Disc := First_Discriminant (Ptyp);
+ Dcon := First_Elmt (Discriminant_Constraint (Ptyp));
+ Discr_Loop : while Present (Dcon) loop
+
+ -- Check if this is the matching discriminant
+
+ if Disc = Entity (Selector_Name (N)) then
- while Present (E) loop
- if D = Entity (Selector_Name (N)) then
+ -- Here we have the matching discriminant. Check for
+ -- the case of a discriminant of a component that is
+ -- constrained by an outer discriminant, which cannot
+ -- be optimized away.
+
+ if
+ Denotes_Discriminant
+ (Node (Dcon), Check_Concurrent => True)
+ then
+ exit Discr_Loop;
-- In the context of a case statement, the expression
-- may have the base type of the discriminant, and we
-- need to preserve the constraint to avoid spurious
-- errors on missing cases.
- if Nkind (Parent (N)) = N_Case_Statement
- and then Etype (Node (E)) /= Etype (D)
+ elsif Nkind (Parent (N)) = N_Case_Statement
+ and then Etype (Node (Dcon)) /= Etype (Disc)
then
Rewrite (N,
Make_Qualified_Expression (Loc,
- Subtype_Mark => New_Occurrence_Of (Etype (D), Loc),
- Expression => New_Copy (Node (E))));
- Analyze (N);
+ Subtype_Mark =>
+ New_Occurrence_Of (Etype (Disc), Loc),
+ Expression =>
+ 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).
+
+ Set_Is_Static_Expression (N, False);
+ return;
+
+ -- Otherwise we can just copy the constraint, but the
+ -- 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 (E)));
+ Rewrite (N, New_Copy_Tree (Node (Dcon)));
+ Analyze_And_Resolve (N);
+ Set_Is_Static_Expression (N, False);
+ return;
end if;
-
- Set_Is_Static_Expression (N, False);
- return;
end if;
- Next_Elmt (E);
- Next_Discriminant (D);
- end loop;
+ Next_Elmt (Dcon);
+ Next_Discriminant (Disc);
+ end loop Discr_Loop;
- -- Note: the above loop should always terminate, but if
- -- it does not, we just missed an optimization due to
- -- some glitch (perhaps a previous error), so ignore!
- end;
+ -- Note: the above loop should always find a matching
+ -- discriminant, but if it does not, we just missed an
+ -- optimization due to some glitch (perhaps a previous
+ -- error), so ignore.
+
+ end if;
end if;
-- The only remaining processing is in the case of a discriminant of
Rewrite (N, New_N);
Analyze (N);
end if;
-
end Expand_N_Selected_Component;
--------------------
Typ : constant Entity_Id := Etype (N);
Pfx : constant Node_Id := Prefix (N);
Ptp : Entity_Id := Etype (Pfx);
- Ent : Entity_Id;
- Decl : Node_Id;
- begin
- -- Special handling for access types
+ function Is_Procedure_Actual (N : Node_Id) return Boolean;
+ -- Check whether the argument is an actual for a procedure call,
+ -- in which case the expansion of a bit-packed slice is deferred
+ -- until the call itself is expanded. The reason this is required
+ -- is that we might have an IN OUT or OUT parameter, and the copy out
+ -- is essential, and that copy out would be missed if we created a
+ -- temporary here in Expand_N_Slice. Note that we don't bother
+ -- to test specifically for an IN OUT or OUT mode parameter, since it
+ -- is a bit tricky to do, and it is harmless to defer expansion
+ -- in the IN case, since the call processing will still generate the
+ -- appropriate copy in operation, which will take care of the slice.
+
+ procedure Make_Temporary;
+ -- Create a named variable for the value of the slice, in
+ -- cases where the back-end cannot handle it properly, e.g.
+ -- when packed types or unaligned slices are involved.
- if Is_Access_Type (Ptp) then
+ -------------------------
+ -- Is_Procedure_Actual --
+ -------------------------
- -- Check for explicit dereference required for checked pool
+ function Is_Procedure_Actual (N : Node_Id) return Boolean is
+ Par : Node_Id := Parent (N);
+
+ begin
+ loop
+ -- If our parent is a procedure call we can return
- Insert_Dereference_Action (Pfx);
+ if Nkind (Par) = N_Procedure_Call_Statement then
+ return True;
- -- If we have an access to a packed array type, then put in an
- -- explicit dereference. We do this in case the slice must be
- -- expanded, and we want to make sure we get an access check.
+ -- If our parent is a type conversion, keep climbing the
+ -- tree, since a type conversion can be a procedure actual.
+ -- Also keep climbing if parameter association or a qualified
+ -- expression, since these are additional cases that do can
+ -- appear on procedure actuals.
- Ptp := Designated_Type (Ptp);
+ elsif Nkind_In (Par, N_Type_Conversion,
+ N_Parameter_Association,
+ N_Qualified_Expression)
+ then
+ Par := Parent (Par);
- if Is_Array_Type (Ptp) and then Is_Packed (Ptp) then
- Rewrite (Pfx,
- Make_Explicit_Dereference (Sloc (N),
- Prefix => Relocate_Node (Pfx)));
+ -- Any other case is not what we are looking for
- Analyze_And_Resolve (Pfx, Ptp);
+ else
+ return False;
+ end if;
+ end loop;
+ end Is_Procedure_Actual;
- -- The prefix will now carry the Access_Check flag for the back
- -- end, remove it from slice itself.
+ --------------------
+ -- Make_Temporary --
+ --------------------
- Set_Do_Access_Check (N, False);
- end if;
+ procedure Make_Temporary is
+ Decl : Node_Id;
+ Ent : constant Entity_Id :=
+ Make_Defining_Identifier (Loc, New_Internal_Name ('T'));
+ begin
+ Decl :=
+ Make_Object_Declaration (Loc,
+ Defining_Identifier => Ent,
+ Object_Definition => New_Occurrence_Of (Typ, Loc));
+
+ Set_No_Initialization (Decl);
+
+ Insert_Actions (N, New_List (
+ Decl,
+ Make_Assignment_Statement (Loc,
+ Name => New_Occurrence_Of (Ent, Loc),
+ Expression => Relocate_Node (N))));
+
+ Rewrite (N, New_Occurrence_Of (Ent, Loc));
+ Analyze_And_Resolve (N, Typ);
+ end Make_Temporary;
+
+ -- Start of processing for Expand_N_Slice
+
+ begin
+ -- Special handling for access types
+
+ if Is_Access_Type (Ptp) then
+
+ Ptp := Designated_Type (Ptp);
+
+ Rewrite (Pfx,
+ Make_Explicit_Dereference (Sloc (N),
+ Prefix => Relocate_Node (Pfx)));
+
+ Analyze_And_Resolve (Pfx, Ptp);
end if;
-- Range checks are potentially also needed for cases involving
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.
-- is caught elsewhere, and the expansion would intefere
-- with generating the error message).
- if Is_Packed (Typ)
- and then Nkind (Parent (N)) /= N_Assignment_Statement
- and then Nkind (Parent (N)) /= N_Indexed_Component
- and then not Is_Renamed_Object (N)
- and then Nkind (Parent (N)) /= N_Procedure_Call_Statement
- and then (Nkind (Parent (N)) /= N_Attribute_Reference
- or else
- Attribute_Name (Parent (N)) /= Name_Address)
- then
- Ent :=
- Make_Defining_Identifier (Loc, New_Internal_Name ('T'));
+ if not Is_Packed (Typ) then
- Decl :=
- Make_Object_Declaration (Loc,
- Defining_Identifier => Ent,
- Object_Definition => New_Occurrence_Of (Typ, Loc));
+ -- Apply transformation for actuals of a function call,
+ -- where Expand_Actuals is not used.
- Set_No_Initialization (Decl);
+ if Nkind (Parent (N)) = N_Function_Call
+ and then Is_Possibly_Unaligned_Slice (N)
+ then
+ Make_Temporary;
+ end if;
- Insert_Actions (N, New_List (
- Decl,
- Make_Assignment_Statement (Loc,
- Name => New_Occurrence_Of (Ent, Loc),
- Expression => Relocate_Node (N))));
+ elsif Nkind (Parent (N)) = N_Assignment_Statement
+ or else (Nkind (Parent (Parent (N))) = N_Assignment_Statement
+ and then Parent (N) = Name (Parent (Parent (N))))
+ then
+ return;
- Rewrite (N, New_Occurrence_Of (Ent, Loc));
- Analyze_And_Resolve (N, Typ);
+ elsif Nkind (Parent (N)) = N_Indexed_Component
+ or else Is_Renamed_Object (N)
+ or else Is_Procedure_Actual (N)
+ then
+ return;
+
+ elsif Nkind (Parent (N)) = N_Attribute_Reference
+ and then Attribute_Name (Parent (N)) = Name_Address
+ then
+ return;
+
+ else
+ Make_Temporary;
end if;
end Expand_N_Slice;
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;
if not Is_Constrained (Target_Type) then
if Has_Discriminants (Operand_Type) then
Disc := First_Discriminant (Operand_Type);
+
+ if Disc /= First_Stored_Discriminant (Operand_Type) then
+ Disc := First_Stored_Discriminant (Operand_Type);
+ end if;
+
Cons := New_List;
while Present (Disc) loop
Append_To (Cons,
Make_Selected_Component (Loc,
- Prefix => Duplicate_Subexpr (Operand),
+ Prefix => Duplicate_Subexpr_Move_Checks (Operand),
Selector_Name =>
Make_Identifier (Loc, Chars (Disc))));
Next_Discriminant (Disc);
Unchecked_Convert_To (Etype (N_Ix),
Make_Attribute_Reference (Loc,
Prefix =>
- Duplicate_Subexpr
+ Duplicate_Subexpr_No_Checks
(Operand, Name_Req => True),
Attribute_Name => Name_First,
Expressions => New_List (
Unchecked_Convert_To (Etype (N_Ix),
Make_Attribute_Reference (Loc,
Prefix =>
- Duplicate_Subexpr
+ Duplicate_Subexpr_No_Checks
(Operand, Name_Req => True),
Attribute_Name => Name_Last,
Expressions => New_List (
-- [constraint_error when Tnn < typ'First or else Tnn > typ'Last]
-- Tnn
+ -- This is necessary when there is a conversion of integer to float
+ -- or to fixed-point to ensure that the correct checks are made. It
+ -- is not necessary for float to float where it is enough to simply
+ -- set the Do_Range_Check flag.
+
procedure Real_Range_Check is
Btyp : constant Entity_Id := Base_Type (Target_Type);
Lo : constant Node_Id := Type_Low_Bound (Target_Type);
Hi : constant Node_Id := Type_High_Bound (Target_Type);
+ Xtyp : constant Entity_Id := Etype (Operand);
Conv : Node_Id;
Tnn : Entity_Id;
-- Nothing to do if expression is an entity on which checks
-- have been suppressed.
- if Is_Entity_Name (Expression (N))
- and then Range_Checks_Suppressed (Entity (Expression (N)))
+ if Is_Entity_Name (Operand)
+ and then Range_Checks_Suppressed (Entity (Operand))
+ then
+ return;
+ end if;
+
+ -- Nothing to do if bounds are all static and we can tell that
+ -- the expression is within the bounds of the target. Note that
+ -- if the operand is of an unconstrained floating-point type,
+ -- 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);
+
+ begin
+ if (not Is_Floating_Point_Type (Xtyp)
+ or else Is_Constrained (Xtyp))
+ and then Compile_Time_Known_Value (S_Lo)
+ and then Compile_Time_Known_Value (S_Hi)
+ and then Compile_Time_Known_Value (Hi)
+ and then Compile_Time_Known_Value (Lo)
+ then
+ declare
+ D_Lov : constant Ureal := Expr_Value_R (Lo);
+ D_Hiv : constant Ureal := Expr_Value_R (Hi);
+ S_Lov : Ureal;
+ S_Hiv : Ureal;
+
+ begin
+ if Is_Real_Type (Xtyp) then
+ S_Lov := Expr_Value_R (S_Lo);
+ S_Hiv := Expr_Value_R (S_Hi);
+ else
+ S_Lov := UR_From_Uint (Expr_Value (S_Lo));
+ S_Hiv := UR_From_Uint (Expr_Value (S_Hi));
+ end if;
+
+ if D_Hiv > D_Lov
+ and then S_Lov >= D_Lov
+ and then S_Hiv <= D_Hiv
+ then
+ Set_Do_Range_Check (Operand, False);
+ return;
+ end if;
+ end;
+ end if;
+ end;
+
+ -- For float to float conversions, we are done
+
+ if Is_Floating_Point_Type (Xtyp)
+ and then
+ Is_Floating_Point_Type (Btyp)
then
return;
end if;
- -- Here we rewrite the conversion as described above
+ -- Otherwise rewrite the conversion as described above
Conv := Relocate_Node (N);
Rewrite
(Subtype_Mark (Conv), New_Occurrence_Of (Btyp, Loc));
Set_Etype (Conv, Btyp);
- -- Skip overflow check for integer to float conversions,
- -- since it is not needed, and in any case gigi generates
- -- incorrect code for such overflow checks ???
+ -- 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 (Expression (N))) then
- Set_Do_Overflow_Check (Conv, True);
+ if not Is_Integer_Type (Etype (Operand)) then
+ Enable_Overflow_Check (Conv);
end if;
Tnn :=
Expression => Conv),
Make_Raise_Constraint_Error (Loc,
- Condition =>
- Make_Or_Else (Loc,
- Left_Opnd =>
- Make_Op_Lt (Loc,
- Left_Opnd => New_Occurrence_Of (Tnn, Loc),
- Right_Opnd =>
- Make_Attribute_Reference (Loc,
- Attribute_Name => Name_First,
- Prefix =>
- New_Occurrence_Of (Target_Type, Loc))),
+ Condition =>
+ Make_Or_Else (Loc,
+ Left_Opnd =>
+ Make_Op_Lt (Loc,
+ Left_Opnd => New_Occurrence_Of (Tnn, Loc),
+ Right_Opnd =>
+ Make_Attribute_Reference (Loc,
+ Attribute_Name => Name_First,
+ Prefix =>
+ New_Occurrence_Of (Target_Type, Loc))),
- Right_Opnd =>
- Make_Op_Gt (Loc,
- Left_Opnd => New_Occurrence_Of (Tnn, Loc),
- Right_Opnd =>
- Make_Attribute_Reference (Loc,
- Attribute_Name => Name_Last,
- Prefix =>
- New_Occurrence_Of (Target_Type, Loc)))))));
+ Right_Opnd =>
+ Make_Op_Gt (Loc,
+ Left_Opnd => New_Occurrence_Of (Tnn, Loc),
+ Right_Opnd =>
+ Make_Attribute_Reference (Loc,
+ Attribute_Name => Name_Last,
+ Prefix =>
+ New_Occurrence_Of (Target_Type, Loc)))),
+ Reason => CE_Range_Check_Failed)));
Rewrite (N, New_Occurrence_Of (Tnn, Loc));
Analyze_And_Resolve (N, Btyp);
-- so remove the conversion completely, it is useless.
if Operand_Type = Target_Type then
- Rewrite (N, Relocate_Node (Expression (N)));
- 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);
+ Rewrite (N, Relocate_Node (Operand));
return;
end if;
-- 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);
-- cases.
elsif In_Instance_Body
- and then Type_Access_Level (Operand_Type)
- > Type_Access_Level (Target_Type)
+ and then Type_Access_Level (Operand_Type) >
+ Type_Access_Level (Target_Type)
then
- Rewrite (N, Make_Raise_Program_Error (Sloc (N)));
+ Rewrite (N,
+ Make_Raise_Program_Error (Sloc (N),
+ Reason => PE_Accessibility_Check_Failed));
Set_Etype (N, Target_Type);
-- When the operand is a selected access discriminant
and then Object_Access_Level (Operand) >
Type_Access_Level (Target_Type)
then
- Rewrite (N, Make_Raise_Program_Error (Sloc (N)));
+ Rewrite (N,
+ Make_Raise_Program_Error (Sloc (N),
+ Reason => PE_Accessibility_Check_Failed));
Set_Etype (N, Target_Type);
end if;
end if;
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
Make_And_Then (Loc,
Left_Opnd =>
Make_Op_Ne (Loc,
- Left_Opnd => Duplicate_Subexpr (Operand),
+ Left_Opnd => Duplicate_Subexpr_No_Checks (Operand),
Right_Opnd => Make_Null (Loc)),
Right_Opnd =>
Make_Not_In (Loc,
Left_Opnd =>
Make_Explicit_Dereference (Loc,
- Prefix => Duplicate_Subexpr (Operand)),
+ Prefix =>
+ Duplicate_Subexpr_No_Checks (Operand)),
Right_Opnd =>
New_Reference_To (Actual_Target_Type, Loc)));
else
Cond :=
Make_Not_In (Loc,
- Left_Opnd => Duplicate_Subexpr (Operand),
+ Left_Opnd => Duplicate_Subexpr_No_Checks (Operand),
Right_Opnd =>
New_Reference_To (Actual_Target_Type, Loc));
end if;
Insert_Action (N,
Make_Raise_Constraint_Error (Loc,
- Condition => Cond));
+ Condition => Cond,
+ Reason => CE_Tag_Check_Failed));
- Change_Conversion_To_Unchecked (N);
- Analyze_And_Resolve (N, Target_Type);
+ declare
+ Conv : Node_Id;
+ begin
+ Conv :=
+ Make_Unchecked_Type_Conversion (Loc,
+ Subtype_Mark => New_Occurrence_Of (Target_Type, Loc),
+ Expression => Relocate_Node (Expression (N)));
+ Rewrite (N, Conv);
+ Analyze_And_Resolve (N, Target_Type);
+ end;
end if;
end;
elsif Is_Floating_Point_Type (Operand_Type)
and then
(Is_Integer_Type (Target_Type)
- 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;
-
+ or else
+ (Is_Fixed_Point_Type (Target_Type) and then Conversion_OK (N)))
+ then
-- 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 (Expression (N)) then
- Rewrite (Expression (N),
+ 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 (Expression (N))));
+ Relocate_Node (Operand)));
- Set_Etype (Expression (N), Standard_Long_Long_Float);
- Enable_Range_Check (Expression (N));
- Set_Do_Range_Check (Expression (Expression (N)), False);
+ Set_Etype (Operand, Universal_Real);
+ Enable_Range_Check (Operand);
+ Set_Do_Range_Check (Expression (Operand), False);
end if;
-- Case of array conversions
-- assignment processing.
elsif Is_Record_Type (Target_Type) then
- Handle_Changed_Representation;
+
+ -- Ada 2005 (AI-216): Program_Error is raised when converting from
+ -- a derived Unchecked_Union type to an unconstrained non-Unchecked_
+ -- Union type if the operand lacks inferable discriminants.
+
+ if Is_Derived_Type (Operand_Type)
+ and then Is_Unchecked_Union (Base_Type (Operand_Type))
+ and then not Is_Constrained (Target_Type)
+ and then not Is_Unchecked_Union (Base_Type (Target_Type))
+ and then not Has_Inferable_Discriminants (Operand)
+ then
+ -- To prevent Gigi from generating illegal code, we make a
+ -- Program_Error node, but we give it the target type of the
+ -- conversion.
+
+ declare
+ PE : constant Node_Id := Make_Raise_Program_Error (Loc,
+ Reason => PE_Unchecked_Union_Restriction);
+
+ begin
+ Set_Etype (PE, Target_Type);
+ Rewrite (N, PE);
+
+ end;
+ else
+ Handle_Changed_Representation;
+ end if;
-- Case of conversions of enumeration types
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.
+ -- For now we do this only for conversions of discrete types.
+
+ if Nkind (N) = N_Type_Conversion
+ and then Is_Discrete_Type (Etype (N))
+ then
+ declare
+ Expr : constant Node_Id := Expression (N);
+ Ftyp : Entity_Id;
+ Ityp : Entity_Id;
+
+ begin
+ if Do_Range_Check (Expr)
+ and then Is_Discrete_Type (Etype (Expr))
+ then
+ Set_Do_Range_Check (Expr, False);
+
+ -- Before we do a range check, we have to deal with treating
+ -- a fixed-point operand as an integer. The way we do this
+ -- is simply to do an unchecked conversion to an appropriate
+ -- integer type large enough to hold the result.
+
+ -- This code is not active yet, because we are only dealing
+ -- with discrete types so far ???
+
+ if Nkind (Expr) in N_Has_Treat_Fixed_As_Integer
+ and then Treat_Fixed_As_Integer (Expr)
+ then
+ Ftyp := Base_Type (Etype (Expr));
+
+ if Esize (Ftyp) >= Esize (Standard_Integer) then
+ Ityp := Standard_Long_Long_Integer;
+ else
+ Ityp := Standard_Integer;
+ end if;
+
+ Rewrite (Expr, Unchecked_Convert_To (Ityp, Expr));
+ end if;
+
+ -- Reset overflow flag, since the range check will include
+ -- dealing with possible overflow, and generate the check
+ -- If Address is either source or target type, suppress
+ -- range check to avoid typing anomalies when it is a visible
+ -- integer type.
+
+ Set_Do_Overflow_Check (N, False);
+ if not Is_Descendent_Of_Address (Etype (Expr))
+ and then not Is_Descendent_Of_Address (Target_Type)
+ then
+ Generate_Range_Check
+ (Expr, Target_Type, CE_Range_Check_Failed);
+ end if;
+ 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
Val <= Expr_Value (Type_High_Bound (Target_Type))
then
Rewrite (N, Make_Integer_Literal (Sloc (N), Val));
- Analyze_And_Resolve (N, Target_Type);
+
+ -- If Address is the target type, just set the type
+ -- to avoid a spurious type error on the literal when
+ -- Address is a visible integer type.
+
+ if Is_Descendent_Of_Address (Target_Type) then
+ Set_Etype (N, Target_Type);
+ else
+ Analyze_And_Resolve (N, Target_Type);
+ end if;
+
return;
end if;
end;
Typ : Entity_Id;
Lhs : Node_Id;
Rhs : Node_Id;
- Bodies : List_Id)
- return Node_Id
+ Bodies : List_Id) return Node_Id
is
Loc : constant Source_Ptr := Sloc (Nod);
+ Result : Node_Id;
+ C : Entity_Id;
+
+ First_Time : Boolean := True;
+
function Suitable_Element (C : Entity_Id) return Entity_Id;
-- Return the first field to compare beginning with C, skipping the
- -- inherited components
+ -- inherited components.
+
+ ----------------------
+ -- Suitable_Element --
+ ----------------------
function Suitable_Element (C : Entity_Id) return Entity_Id is
begin
then
return Suitable_Element (Next_Entity (C));
+ elsif Is_Interface (Etype (C)) then
+ return Suitable_Element (Next_Entity (C));
+
else
return C;
end if;
end Suitable_Element;
- Result : Node_Id;
- C : Entity_Id;
-
- First_Time : Boolean := True;
-
-- Start of processing for Expand_Record_Equality
begin
- -- Special processing for the unchecked union case, which will occur
- -- only in the context of tagged types and dynamic dispatching, since
- -- other cases are handled statically. We return True, but insert a
- -- raise Program_Error statement.
-
- if Is_Unchecked_Union (Typ) then
-
- -- If this is a component of an enclosing record, return the Raise
- -- statement directly.
-
- if No (Parent (Lhs)) then
- Result := Make_Raise_Program_Error (Loc);
- Set_Etype (Result, Standard_Boolean);
- return Result;
-
- else
- Insert_Action (Lhs,
- Make_Raise_Program_Error (Loc));
- return New_Occurrence_Of (Standard_True, Loc);
- end if;
- end if;
-
-- Generates the following code: (assuming that Typ has one Discr and
-- component C2 is also a record)
C := Suitable_Element (First_Entity (Typ));
while Present (C) loop
-
declare
New_Lhs : Node_Id;
New_Rhs : Node_Id;
+ Check : Node_Id;
begin
if First_Time then
First_Time := False;
New_Lhs := Lhs;
New_Rhs := Rhs;
-
else
New_Lhs := New_Copy_Tree (Lhs);
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));
end if;
end Fixup_Universal_Fixed_Operation;
+ ------------------------------
+ -- Get_Allocator_Final_List --
+ ------------------------------
+
+ function Get_Allocator_Final_List
+ (N : Node_Id;
+ T : Entity_Id;
+ PtrT : Entity_Id) return Entity_Id
+ is
+ Loc : constant Source_Ptr := Sloc (N);
+
+ Owner : Entity_Id := PtrT;
+ -- 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
+ Owner := Make_Defining_Identifier (Loc, New_Internal_Name ('J'));
+ Insert_Action (N,
+ Make_Full_Type_Declaration (Loc,
+ Defining_Identifier => Owner,
+ Type_Definition =>
+ Make_Access_To_Object_Definition (Loc,
+ Subtype_Indication =>
+ New_Occurrence_Of (T, Loc))));
+
+ Build_Final_List (N, Owner);
+ Set_Associated_Final_Chain (PtrT, Associated_Final_Chain (Owner));
+
+ -- 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;
+
+ return Find_Final_List (Owner);
+ end Get_Allocator_Final_List;
+
+ ---------------------------------
+ -- Has_Inferable_Discriminants --
+ ---------------------------------
+
+ function Has_Inferable_Discriminants (N : Node_Id) return Boolean is
+
+ function Prefix_Is_Formal_Parameter (N : Node_Id) return Boolean;
+ -- Determines whether the left-most prefix of a selected component is a
+ -- formal parameter in a subprogram. Assumes N is a selected component.
+
+ --------------------------------
+ -- Prefix_Is_Formal_Parameter --
+ --------------------------------
+
+ function Prefix_Is_Formal_Parameter (N : Node_Id) return Boolean is
+ Sel_Comp : Node_Id := N;
+
+ begin
+ -- Move to the left-most prefix by climbing up the tree
+
+ while Present (Parent (Sel_Comp))
+ and then Nkind (Parent (Sel_Comp)) = N_Selected_Component
+ loop
+ Sel_Comp := Parent (Sel_Comp);
+ end loop;
+
+ return Ekind (Entity (Prefix (Sel_Comp))) in Formal_Kind;
+ end Prefix_Is_Formal_Parameter;
+
+ -- Start of processing for Has_Inferable_Discriminants
+
+ begin
+ -- For identifiers and indexed components, it is sufficent to have a
+ -- constrained Unchecked_Union nominal subtype.
+
+ if Nkind_In (N, N_Identifier, N_Indexed_Component) then
+ return Is_Unchecked_Union (Base_Type (Etype (N)))
+ and then
+ Is_Constrained (Etype (N));
+
+ -- For selected components, the subtype of the selector must be a
+ -- constrained Unchecked_Union. If the component is subject to a
+ -- per-object constraint, then the enclosing object must have inferable
+ -- discriminants.
+
+ elsif Nkind (N) = N_Selected_Component then
+ if Has_Per_Object_Constraint (Entity (Selector_Name (N))) then
+
+ -- A small hack. If we have a per-object constrained selected
+ -- component of a formal parameter, return True since we do not
+ -- know the actual parameter association yet.
+
+ if Prefix_Is_Formal_Parameter (N) then
+ return True;
+ end if;
+
+ -- Otherwise, check the enclosing object and the selector
+
+ return Has_Inferable_Discriminants (Prefix (N))
+ and then
+ Has_Inferable_Discriminants (Selector_Name (N));
+ end if;
+
+ -- The call to Has_Inferable_Discriminants will determine whether
+ -- the selector has a constrained Unchecked_Union nominal type.
+
+ return Has_Inferable_Discriminants (Selector_Name (N));
+
+ -- A qualified expression has inferable discriminants if its subtype
+ -- mark is a constrained Unchecked_Union subtype.
+
+ elsif Nkind (N) = N_Qualified_Expression then
+ return Is_Unchecked_Union (Subtype_Mark (N))
+ and then
+ Is_Constrained (Subtype_Mark (N));
+
+ end if;
+
+ return False;
+ end Has_Inferable_Discriminants;
+
-------------------------------
-- Insert_Dereference_Action --
-------------------------------
Loc : constant Source_Ptr := Sloc (N);
Typ : constant Entity_Id := Etype (N);
Pool : constant Entity_Id := Associated_Storage_Pool (Typ);
+ Pnod : constant Node_Id := Parent (N);
function Is_Checked_Storage_Pool (P : Entity_Id) return Boolean;
- -- return true if type of P is derived from Checked_Pool;
+ -- Return true if type of P is derived from Checked_Pool;
+
+ -----------------------------
+ -- Is_Checked_Storage_Pool --
+ -----------------------------
function Is_Checked_Storage_Pool (P : Entity_Id) return Boolean is
T : Entity_Id;
-- Start of processing for Insert_Dereference_Action
begin
- if not Comes_From_Source (Parent (N)) then
- return;
+ pragma Assert (Nkind (Pnod) = N_Explicit_Dereference);
- elsif not Is_Checked_Storage_Pool (Pool) then
+ if not (Is_Checked_Storage_Pool (Pool)
+ and then Comes_From_Source (Original_Node (Pnod)))
+ then
return;
end if;
New_Reference_To (Pool, Loc),
- -- Storage_Address
+ -- Storage_Address. We use the attribute Pool_Address,
+ -- which uses the pointer itself to find the address of
+ -- the object, and which handles unconstrained arrays
+ -- properly by computing the address of the template.
+ -- i.e. the correct address of the corresponding allocation.
Make_Attribute_Reference (Loc,
- Prefix =>
- Make_Explicit_Dereference (Loc, Duplicate_Subexpr (N)),
- Attribute_Name => Name_Address),
+ Prefix => Duplicate_Subexpr_Move_Checks (N),
+ Attribute_Name => Name_Pool_Address),
-- Size_In_Storage_Elements
Left_Opnd =>
Make_Attribute_Reference (Loc,
Prefix =>
- Make_Explicit_Dereference (Loc, Duplicate_Subexpr (N)),
+ Make_Explicit_Dereference (Loc,
+ Duplicate_Subexpr_Move_Checks (N)),
Attribute_Name => Name_Size),
Right_Opnd =>
Make_Integer_Literal (Loc, System_Storage_Unit)),
Make_Attribute_Reference (Loc,
Prefix =>
- Make_Explicit_Dereference (Loc, Duplicate_Subexpr (N)),
+ Make_Explicit_Dereference (Loc,
+ Duplicate_Subexpr_Move_Checks (N)),
Attribute_Name => Name_Alignment))));
+ exception
+ when RE_Not_Available =>
+ return;
end Insert_Dereference_Action;
------------------------------
-- 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;
-- instantiated function itself.
function Make_Array_Comparison_Op
- (Typ : Entity_Id;
- Nod : Node_Id)
- return Node_Id
+ (Typ : Entity_Id;
+ Nod : Node_Id) return Node_Id
is
Loc : constant Source_Ptr := Sloc (Nod);
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;
---------------------------
-- Here typ is the boolean array type
function Make_Boolean_Array_Op
- (Typ : Entity_Id;
- N : Node_Id)
- return Node_Id
+ (Typ : Entity_Id;
+ N : Node_Id) return Node_Id
is
Loc : constant Source_Ptr := Sloc (N);
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;
+
+ elsif Nkind (N) not in N_Op_Compare then
+ return;
+ end if;
+
+ declare
+ Typ : constant Entity_Id := Etype (N);
+ Op1 : constant Node_Id := Left_Opnd (N);
+ Op2 : constant Node_Id := Right_Opnd (N);
+
+ Res : constant Compare_Result := Compile_Time_Compare (Op1, Op2);
+ -- Res indicates if compare outcome can be compile time determined
+
+ True_Result : Boolean;
+ False_Result : Boolean;
+
+ 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 not Warnings_Off (Etype (Left_Opnd (N)))
+ and then Is_Integer_Type (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 not Warnings_Off (Etype (Left_Opnd (N)))
+ and then Is_Integer_Type (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;
+
+ ----------------------------
+ -- Safe_In_Place_Array_Op --
+ ----------------------------
+
+ function Safe_In_Place_Array_Op
+ (Lhs : Node_Id;
+ Op1 : Node_Id;
+ Op2 : Node_Id) return Boolean
+ is
+ Target : Entity_Id;
+
+ function Is_Safe_Operand (Op : Node_Id) return Boolean;
+ -- Operand is safe if it cannot overlap part of the target of the
+ -- operation. If the operand and the target are identical, the operand
+ -- 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
+
+ ------------------
+ -- Is_Unaliased --
+ ------------------
+
+ function Is_Unaliased (N : Node_Id) return Boolean is
+ begin
+ return
+ Is_Entity_Name (N)
+ and then No (Address_Clause (Entity (N)))
+ and then No (Renamed_Object (Entity (N)));
+ end Is_Unaliased;
+
+ ---------------------
+ -- Is_Safe_Operand --
+ ---------------------
+
+ function Is_Safe_Operand (Op : Node_Id) return Boolean is
+ begin
+ if No (Op) then
+ return True;
+
+ elsif Is_Entity_Name (Op) then
+ return Is_Unaliased (Op);
+
+ elsif Nkind_In (Op, N_Indexed_Component, N_Selected_Component) then
+ return Is_Unaliased (Prefix (Op));
+
+ elsif Nkind (Op) = N_Slice then
+ return
+ Is_Unaliased (Prefix (Op))
+ and then Entity (Prefix (Op)) /= Target;
+
+ elsif Nkind (Op) = N_Op_Not then
+ return Is_Safe_Operand (Right_Opnd (Op));
- Res : constant Compare_Result := Compile_Time_Compare (Op1, Op2);
- -- Res indicates if compare outcome can be determined at compile time
+ else
+ return False;
+ end if;
+ end Is_Safe_Operand;
- True_Result : Boolean;
- False_Result : Boolean;
+ -- Start of processing for Is_Safe_In_Place_Array_Op
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;
+ -- We skip this processing if the component size is not the
+ -- same as a system storage unit (since at least for NOT
+ -- this would cause problems).
- if True_Result then
- Rewrite (N,
- Convert_To (Typ, New_Occurrence_Of (Standard_True, Sloc (N))));
- Analyze_And_Resolve (N, Typ);
+ if Component_Size (Etype (Lhs)) /= System_Storage_Unit then
+ return False;
- elsif False_Result then
- Rewrite (N,
- Convert_To (Typ, New_Occurrence_Of (Standard_False, Sloc (N))));
- Analyze_And_Resolve (N, Typ);
+ -- Cannot do in place stuff on VM_Target since cannot pass addresses
+
+ elsif VM_Target /= No_VM then
+ return False;
+
+ -- Cannot do in place stuff if non-standard Boolean representation
+
+ elsif Has_Non_Standard_Rep (Component_Type (Etype (Lhs))) then
+ return False;
+
+ elsif not Is_Unaliased (Lhs) then
+ return False;
+ else
+ Target := Entity (Lhs);
+
+ return
+ Is_Safe_Operand (Op1)
+ and then Is_Safe_Operand (Op2);
end if;
- end Rewrite_Comparison;
+ end Safe_In_Place_Array_Op;
-----------------------
-- Tagged_Membership --
-- 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 ("abstract 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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