-- --
-- B o d y --
-- --
--- Copyright (C) 1992-2004, Free Software Foundation, Inc. --
+-- Copyright (C) 1992-2005, Free Software Foundation, Inc. --
-- --
-- GNAT is free software; you can redistribute it and/or modify it under --
-- terms of the GNU General Public License as published by the Free Soft- --
with Rtsfind; use Rtsfind;
with Sem; use Sem;
with Sem_Cat; use Sem_Cat;
+with Sem_Ch3; use Sem_Ch3;
with Sem_Ch13; use Sem_Ch13;
with Sem_Eval; use Sem_Eval;
with Sem_Res; use Sem_Res;
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;
package body Exp_Ch4 is
- ------------------------
- -- Local Subprograms --
- ------------------------
+ -----------------------
+ -- Local Subprograms --
+ -----------------------
procedure Binary_Op_Validity_Checks (N : Node_Id);
pragma Inline (Binary_Op_Validity_Checks);
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 responsibility 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
function Get_Allocator_Final_List
(N : Node_Id;
T : Entity_Id;
- PtrT : Entity_Id)
- return 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
-- 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;
+ (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.
if Kind = N_Op_Not then
if Nkind (Op1) in N_Binary_Op then
- -- Use negated version of the binary operators.
+ -- Use negated version of the binary operators
if Nkind (Op1) = N_Op_And then
Proc_Name := RTE (RE_Vector_Nand);
-- 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;
if Controlled_Type (T)
and then Ekind (PtrT) = E_Anonymous_Access_Type
then
- -- Create local finalization list for access parameter.
+ -- Create local finalization list for access parameter
Flist := Get_Allocator_Final_List (N, Base_Type (T), PtrT);
end if;
Make_Selected_Component (Loc,
Prefix => New_Reference_To (Temp, Loc),
Selector_Name =>
- New_Reference_To (Tag_Component (T), Loc)),
+ New_Reference_To (First_Tag_Component (T), Loc)),
Expression =>
Unchecked_Convert_To (RTE (RE_Tag),
- New_Reference_To (Access_Disp_Table (T), Loc)));
+ New_Reference_To
+ (Elists.Node (First_Elmt (Access_Disp_Table (T))),
+ Loc)));
-- The previous assignment has to be done in any case
Make_Selected_Component (Loc,
Prefix => Ref,
Selector_Name =>
- New_Reference_To (Tag_Component (Utyp), Loc)),
+ New_Reference_To (First_Tag_Component (Utyp), Loc)),
Expression =>
Unchecked_Convert_To (RTE (RE_Tag),
New_Reference_To (
- Access_Disp_Table (Utyp), Loc)));
+ Elists.Node (First_Elmt (Access_Disp_Table (Utyp))),
+ Loc)));
Set_Assignment_OK (Name (Tag_Assign));
Insert_Action (N, Tag_Assign);
-- Normal case, not a secondary stack allocation
else
- Flist := Find_Final_List (PtrT);
+ 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;
and then Nkind (Exp) = N_Allocator
and then Nkind (Expression (Exp)) /= N_Qualified_Expression
then
- -- Apply constraint to designated subtype indication.
+ -- Apply constraint to designated subtype indication
Apply_Constraint_Check (Expression (Exp),
Designated_Type (Designated_Type (PtrT)),
-- 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
+ -- function Enn (A : atyp; B : btyp) return boolean is
-- begin
-- if (A'length (1) = 0 or else A'length (2) = 0)
-- and then
-- 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_type_1 := A'first (1)
- -- B1 : Index_Type_1 := B'first (1)
+ -- A1 : Index_T1 := A'first (1);
+ -- B1 : Index_T1 := B'first (1);
-- begin
-- loop
-- declare
- -- A2 : Index_type_2 := A'first (2);
- -- B2 : Index_type_2 := B'first (2)
+ -- 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;
- --
+
-- exit when A2 = A'last (2);
- -- A2 := Index_type2'succ (A2);
- -- B2 := Index_type2'succ (B2);
+ -- A2 := Index_T2'succ (A2);
+ -- B2 := Index_T2'succ (B2);
-- end loop;
-- end;
- --
+
-- exit when A1 = A'last (1);
- -- A1 := Index_type1'succ (A1);
- -- B1 := Index_type1'succ (B1);
+ -- A1 := Index_T1'succ (A1);
+ -- B1 := Index_T1'succ (B1);
-- end loop;
-- 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);
Decls : constant List_Id := New_List;
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).
+ 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.
+ 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;
- -- This procedure returns a declare block:
+ Index : Node_Id) return Node_Id;
+ -- This procedure returns the following code
--
-- declare
- -- An : Index_Type_n := A'First (n);
- -- Bn : Index_Type_n := B'First (n);
+ -- Bn : Index_T := B'First (N);
-- begin
-- loop
-- xxx
- -- exit when An = A'Last (n);
- -- An := Index_Type_n'Succ (An)
- -- Bn := Index_Type_n'Succ (Bn)
+ -- exit when An = A'Last (N);
+ -- An := Index_T'Succ (An)
+ -- Bn := Index_T'Succ (Bn)
-- end loop;
-- end;
--
- -- where N is the value of "n" in the above code. Index is the
+ -- 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 declare block for the next
+ -- 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.
--
function Arr_Attr
(Arr : Entity_Id;
Nam : Name_Id;
- Num : Int)
- return Node_Id
+ Num : Int) return Node_Id
is
begin
return
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_Return_Statement (Loc,
+ Expression => New_Occurrence_Of (Standard_False, Loc))));
+ end if;
end Component_Equality;
+ ------------------
+ -- 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;
+
+ 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
+ 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 : constant Entity_Id := Make_Defining_Identifier (Loc,
- Chars => New_Internal_Name ('B'));
- Index_Type_n : Entity_Id;
+
+ 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 declare block
+ -- 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
+ Bn := An;
+ end if;
- Index_Type_n := Base_Type (Etype (Index));
Append (New_Reference_To (An, Loc), Index_List1);
Append (New_Reference_To (Bn, Loc), Index_List2);
- return
- Make_Block_Statement (Loc,
- Declarations => New_List (
- Make_Object_Declaration (Loc,
- Defining_Identifier => An,
- Object_Definition =>
- New_Reference_To (Index_Type_n, Loc),
- Expression => Arr_Attr (A, Name_First, N)),
+ Stm_List := New_List (
+ Handle_One_Dimension (N + 1, Next_Index (Index)));
- Make_Object_Declaration (Loc,
- Defining_Identifier => Bn,
- Object_Definition =>
- New_Reference_To (Index_Type_n, Loc),
- Expression => Arr_Attr (B, Name_First, N))),
-
- Handled_Statement_Sequence =>
- Make_Handled_Sequence_Of_Statements (Loc,
- Statements => New_List (
- Make_Implicit_Loop_Statement (Nod,
- Statements => New_List (
- Handle_One_Dimension (N + 1, Next_Index (Index)),
-
- Make_Exit_Statement (Loc,
- Condition =>
- Make_Op_Eq (Loc,
- Left_Opnd => New_Reference_To (An, Loc),
- Right_Opnd => Arr_Attr (A, Name_Last, N))),
-
- Make_Assignment_Statement (Loc,
- Name => New_Reference_To (An, Loc),
- Expression =>
- Make_Attribute_Reference (Loc,
- Prefix =>
- New_Reference_To (Index_Type_n, Loc),
- Attribute_Name => Name_Succ,
- Expressions => New_List (
- New_Reference_To (An, Loc)))),
-
- Make_Assignment_Statement (Loc,
- Name => New_Reference_To (Bn, Loc),
- Expression =>
- Make_Attribute_Reference (Loc,
- Prefix =>
- New_Reference_To (Index_Type_n, Loc),
- Attribute_Name => Name_Succ,
- Expressions => New_List (
- New_Reference_To (Bn, Loc)))))))));
+ if Need_Separate_Indexes then
+
+ -- Generate guard for loop, followed by increments of indices
+
+ 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 (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)))));
+
+ 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;
+
+ -- If separate indexes, we need a declare block for An and Bn, and a
+ -- loop without an iteration scheme.
+
+ if Need_Separate_Indexes then
+ Loop_Stm :=
+ Make_Implicit_Loop_Statement (Nod, Statements => Stm_List);
+
+ 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))),
+
+ 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 Handle_One_Dimension;
-----------------------
begin
Alist := Empty;
Blist := Empty;
- for J in 1 .. Number_Dimensions (Typ) loop
+ for J in 1 .. Number_Dimensions (Ltyp) loop
Atest :=
Make_Op_Eq (Loc,
Left_Opnd => Arr_Attr (A, Name_Length, J),
begin
Result := Empty;
- for J in 1 .. Number_Dimensions (Typ) loop
+ for J in 1 .. Number_Dimensions (Ltyp) loop
Rtest :=
Make_Op_Ne (Loc,
Left_Opnd => Arr_Attr (A, Name_Length, J),
-- 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'));
Expression =>
New_Occurrence_Of (Standard_False, Loc)))),
- Handle_One_Dimension (1, First_Index (Typ)),
+ Handle_One_Dimension (1, First_Index (Ltyp)),
Make_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;
Typ : constant Entity_Id := Etype (N);
begin
- if Is_Bit_Packed_Array (Typ) then
+ -- Special case of bit packed array where both operands are known
+ -- to be properly aligned. In this case we use an efficient run time
+ -- routine to carry out the operation (see System.Bit_Ops).
+
+ if Is_Bit_Packed_Array (Typ)
+ and then not Is_Possibly_Unaligned_Object (Left_Opnd (N))
+ and then not Is_Possibly_Unaligned_Object (Right_Opnd (N))
+ then
Expand_Packed_Boolean_Operator (N);
+ return;
+ end if;
- else
- -- For the normal non-packed case, the general expansion is
- -- to build a function for carrying out the comparison (using
- -- Make_Boolean_Array_Op) and then inserting it into the tree.
- -- The original operator node is then rewritten as a call to
- -- this function.
+ -- For the normal non-packed case, the general expansion is to build
+ -- function for carrying out the comparison (use Make_Boolean_Array_Op)
+ -- and then inserting it into the tree. The original operator node is
+ -- then rewritten as a call to this function. We also use this in the
+ -- packed case if either operand is a possibly unaligned object.
- declare
- Loc : constant Source_Ptr := Sloc (N);
- L : constant Node_Id := Relocate_Node (Left_Opnd (N));
- R : constant Node_Id := Relocate_Node (Right_Opnd (N));
- Func_Body : Node_Id;
- Func_Name : Entity_Id;
+ declare
+ Loc : constant Source_Ptr := Sloc (N);
+ L : constant Node_Id := Relocate_Node (Left_Opnd (N));
+ R : constant Node_Id := Relocate_Node (Right_Opnd (N));
+ Func_Body : Node_Id;
+ Func_Name : Entity_Id;
- begin
- Convert_To_Actual_Subtype (L);
- Convert_To_Actual_Subtype (R);
- Ensure_Defined (Etype (L), N);
- Ensure_Defined (Etype (R), N);
- Apply_Length_Check (R, Etype (L));
-
- if Nkind (Parent (N)) = N_Assignment_Statement
- and then Safe_In_Place_Array_Op (Name (Parent (N)), L, R)
- then
- Build_Boolean_Array_Proc_Call (Parent (N), L, R);
+ begin
+ Convert_To_Actual_Subtype (L);
+ Convert_To_Actual_Subtype (R);
+ Ensure_Defined (Etype (L), N);
+ Ensure_Defined (Etype (R), N);
+ Apply_Length_Check (R, Etype (L));
+
+ if Nkind (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
+ elsif Nkind (Parent (N)) = N_Op_Not
+ and then Nkind (N) = N_Op_And
+ and then
+ Safe_In_Place_Array_Op (Name (Parent (Parent (N))), L, R)
+ then
+ return;
+ else
- Func_Body := Make_Boolean_Array_Op (Etype (L), N);
- Func_Name := Defining_Unit_Name (Specification (Func_Body));
- Insert_Action (N, Func_Body);
+ Func_Body := Make_Boolean_Array_Op (Etype (L), N);
+ Func_Name := Defining_Unit_Name (Specification (Func_Body));
+ Insert_Action (N, Func_Body);
- -- Now rewrite the expression with a call
+ -- Now rewrite the expression with a call
- Rewrite (N,
- Make_Function_Call (Loc,
- Name => New_Reference_To (Func_Name, Loc),
- Parameter_Associations =>
- New_List
- (L, Make_Type_Conversion
- (Loc, New_Reference_To (Etype (L), Loc), R))));
+ Rewrite (N,
+ Make_Function_Call (Loc,
+ Name => New_Reference_To (Func_Name, Loc),
+ Parameter_Associations =>
+ New_List (
+ L,
+ Make_Type_Conversion
+ (Loc, New_Reference_To (Etype (L), Loc), R))));
- Analyze_And_Resolve (N, Typ);
- end if;
- end;
- end if;
+ Analyze_And_Resolve (N, Typ);
+ end if;
+ end;
end Expand_Boolean_Operator;
-------------------------------
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;
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),
-- end loop;
-- end if;
- -- ...
+ -- . . .
-- if Sn'Length /= 0 then
-- P := Sn'First;
-- L := Si'First; otherwise (where I is the input param given)
function H return Node_Id;
- -- Builds reference to identifier H.
+ -- Builds reference to identifier H
function Ind_Val (E : Node_Id) return Node_Id;
-- Builds expression Ind_Typ'Val (E);
function L return Node_Id;
- -- Builds reference to identifier L.
+ -- Builds reference to identifier L
function L_Pos return Node_Id;
- -- Builds expression Integer_Type'(Ind_Typ'Pos (L)).
- -- We qualify the expression to avoid universal_integer computations
- -- whenever possible, in the expression for the upper bound H.
+ -- Builds expression Integer_Type'(Ind_Typ'Pos (L)). We qualify the
+ -- expression to avoid universal_integer computations whenever possible,
+ -- in the expression for the upper bound H.
function L_Succ return Node_Id;
- -- Builds expression Ind_Typ'Succ (L).
+ -- Builds expression Ind_Typ'Succ (L)
function One return Node_Id;
- -- Builds integer literal one.
+ -- Builds integer literal one
function P return Node_Id;
- -- Builds reference to identifier P.
+ -- Builds reference to identifier P
function P_Succ return Node_Id;
- -- Builds expression Ind_Typ'Succ (P).
+ -- Builds expression Ind_Typ'Succ (P)
function R return Node_Id;
- -- Builds reference to identifier R.
+ -- Builds reference to identifier R
function S (I : Nat) return Node_Id;
- -- Builds reference to identifier Si, where I is the value given.
+ -- Builds reference to identifier Si, where I is the value given
function S_First (I : Nat) return Node_Id;
- -- Builds expression Si'First, where I is the value given.
+ -- Builds expression Si'First, where I is the value given
function S_Last (I : Nat) return Node_Id;
- -- Builds expression Si'Last, where I is the value given.
+ -- Builds expression Si'Last, where I is the value given
function S_Length (I : Nat) return Node_Id;
- -- Builds expression Si'Length, where I is the value given.
+ -- Builds expression Si'Length, where I is the value given
function S_Length_Test (I : Nat) return Node_Id;
- -- Builds expression Si'Length /= 0, where I is the value given.
+ -- Builds expression Si'Length /= 0, where I is the value given
-------------------
-- Copy_Into_R_S --
procedure Expand_N_Allocator (N : Node_Id) is
PtrT : constant Entity_Id := Etype (N);
+ Dtyp : constant Entity_Id := Designated_Type (PtrT);
Desig : Entity_Id;
Loc : constant Source_Ptr := Sloc (N);
Temp : Entity_Id;
-- so that the constant is not labelled as having a nomimally
-- unconstrained subtype.
- if Entity (Desig) = Base_Type (Designated_Type (PtrT)) then
- Desig := New_Occurrence_Of (Designated_Type (PtrT), Loc);
+ if Entity (Desig) = Base_Type (Dtyp) then
+ Desig := New_Occurrence_Of (Dtyp, Loc);
end if;
Insert_Action (N,
return;
end if;
+ -- Handle case of qualified expression (other than optimization above)
+
if Nkind (Expression (N)) = N_Qualified_Expression then
Expand_Allocator_Expression (N);
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;
+ 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;
begin
-
if No_Initialization (N) then
null;
-- if the context is access to class wide, indicate that
-- the object being allocated has the right specific type.
- if Is_Class_Wide_Type (Designated_Type (PtrT)) then
+ if Is_Class_Wide_Type (Dtyp) then
Arg1 := Unchecked_Convert_To (T, Arg1);
end if;
end if;
-- part of the generated code for the allocator).
if Has_Task (T) then
-
if No (Master_Id (Base_Type (PtrT))) then
-- The designated type was an incomplete type, and
if Controlled_Type (T) then
Flist := Get_Allocator_Final_List (N, Base_Type (T), PtrT);
-
+ if Ekind (PtrT) = E_Anonymous_Access_Type then
+ Attach_Level := Uint_1;
+ else
+ Attach_Level := Uint_2;
+ end if;
Insert_Actions (N,
Make_Init_Call (
Ref => New_Copy_Tree (Arg1),
Typ => T,
Flist_Ref => Flist,
- With_Attach => Make_Integer_Literal (Loc, 2)));
+ With_Attach => Make_Integer_Literal (Loc,
+ Attach_Level)));
end if;
if Is_CPP_Class (T) then
-- Cnn := else-expr
-- end if;
- -- and replace the conditional expression by a reference to Cnn.
+ -- and replace the conditional expression by a reference to Cnn
if Present (Then_Actions (N)) or else Present (Else_Actions (N)) then
Cnn := Make_Defining_Identifier (Loc, New_Internal_Name ('C'));
-----------------
procedure Expand_N_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);
+ 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);
begin
-- If we have an explicit range, do a bit of optimization based
begin
-- If either check is known to fail, replace result
-- by False, since the other check does not matter.
+ -- Preserve the static flag for legality checks, because
+ -- we are constant-folding beyond RM 4.9.
if Lcheck = LT or else Ucheck = GT then
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
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
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
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)
-----------------------------------
-----------------------------------
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
-- was necessary, but it cleans up the code to do it all the time.
if Is_Access_Type (T) then
-
- -- Check whether the prefix comes from a debug pool, and generate
- -- the check before rewriting.
-
- Insert_Dereference_Action (P);
-
- Rewrite (P,
- Make_Explicit_Dereference (Sloc (N),
- Prefix => Relocate_Node (P)));
+ Insert_Explicit_Dereference (P);
Analyze_And_Resolve (P, Designated_Type (T));
end 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
-- 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 --
-------------------------
R_Exp := OK_Convert_To (Op_Type, R_Exp);
end if;
- Rewrite (N,
- Make_Function_Call (Loc,
- Name => New_Reference_To (Eq, Loc),
- Parameter_Associations => New_List (L_Exp, R_Exp)));
+ -- 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 can not 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;
+
+ declare
+ Comp : Node_Id := First (Component_Items (Clist));
+
+ begin
+ while Present (Comp) loop
+
+ -- One component is sufficent
+
+ if Component_Is_Unconstrained_UU (Comp) then
+ return True;
+ end if;
+
+ 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);
+
+ -- Inspect available components
+
+ if Present (Component_Items (Clist)) then
+ declare
+ Comp : Node_Id := First (Component_Items (Clist));
+
+ begin
+ while Present (Comp) loop
+
+ -- One component is sufficent
+
+ if Component_Is_Unconstrained_UU (Comp) then
+ return True;
+ end if;
+
+ Next (Comp);
+ end loop;
+ end;
+ end if;
+
+ -- Inspect available components withing variants
+
+ if Present (Vpart) then
+ declare
+ Variant : Node_Id := First (Variants (Vpart));
+
+ begin
+ while Present (Variant) loop
+
+ -- One component within a variant is sufficent
+
+ if Variant_Is_Unconstrained_UU (Variant) then
+ return True;
+ end if;
+
+ Next (Variant);
+ end loop;
+ end;
+ end if;
+
+ -- Neither the available components, nor the components inside the
+ -- variant parts were of an unconstrained Unchecked_Union subtype.
+
+ return False;
+ end Has_Unconstrained_UU_Component;
+
-- Start of processing for Expand_N_Op_Eq
begin
begin
Force_Validity_Checks := True;
Rewrite (N,
- Expand_Array_Equality (N, Typl, A_Typ,
- Relocate_Node (Lhs), Relocate_Node (Rhs), Bodies));
-
- Insert_Actions (N, Bodies);
+ 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
+ -- Packed case where both operands are known aligned
- elsif Is_Bit_Packed_Array (Typl) then
+ elsif Is_Bit_Packed_Array (Typl)
+ and then not Is_Possibly_Unaligned_Object (Lhs)
+ and then not Is_Possibly_Unaligned_Object (Rhs)
+ then
Expand_Packed_Eq (N);
- -- For non-floating-point elementary types, the primitive equality
- -- always applies, and block-bit comparison is fine. Floating-point
- -- is an exception because of negative zeroes.
+ -- Where the component type is elementary we can use a block bit
+ -- comparison (if supported on the target) exception in the case
+ -- of floating-point (negative zero issues require element by
+ -- element comparison), and atomic types (where we must be sure
+ -- to load elements independently) and possibly unaligned arrays.
elsif Is_Elementary_Type (Component_Type (Typl))
and then not Is_Floating_Point_Type (Component_Type (Typl))
+ and then not Is_Atomic (Component_Type (Typl))
+ and then not Is_Possibly_Unaligned_Object (Lhs)
+ and then not Is_Possibly_Unaligned_Object (Rhs)
and then Support_Composite_Compare_On_Target
then
null;
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;
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
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))) =
Base_Type (Etype (Node (Prim))) = Standard_Boolean;
Next_Elmt (Prim);
- pragma Assert (Present (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), TSS_Composite_Equality)) then
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;
Build_Boolean_Array_Proc_Call (Parent (N), Opnd, Empty);
return;
- -- Special case the negation of a binary operation.
+ -- Special case the negation of a binary operation
elsif (Nkind (Opnd) = N_Op_And
or else Nkind (Opnd) = N_Op_Or
if N = Op1
and then Nkind (Op2) = N_Op_Not
then
- -- (not A) op (not B) can be reduced to a single call.
+ -- (not A) op (not B) can be reduced to a single call
return;
elsif N = Op2
and then Nkind (Parent (N)) = N_Op_Xor
then
- -- A xor (not B) can also be special-cased.
+ -- A xor (not B) can also be special-cased
return;
end if;
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))
elsif Nkind (Parent (N)) = N_Case_Statement
and then Etype (Node (Dcon)) /= Etype (Disc)
then
- -- RBKD is suspicious of the following code. The
- -- call to New_Copy instead of New_Copy_Tree is
- -- suspicious, and the call to Analyze instead
- -- of Analyze_And_Resolve is also suspicious ???
-
- -- Wouldn't it be good enough to do a perfectly
- -- normal Analyze_And_Resolve call using the
- -- subtype of the discriminant here???
-
Rewrite (N,
Make_Qualified_Expression (Loc,
Subtype_Mark =>
New_Occurrence_Of (Etype (Disc), Loc),
Expression =>
- New_Copy (Node (Dcon))));
- Analyze (N);
+ New_Copy_Tree (Node (Dcon))));
+ Analyze_And_Resolve (N, Etype (Disc));
-- In case that comes out as a static expression,
-- reset it (a selected component is never static).
return;
-- Otherwise we can just copy the constraint, but the
- -- result is certainly not static!
-
- -- Again the New_Copy here and the failure to even
- -- to an analyze call is uneasy ???
+ -- result is certainly not static! In some cases the
+ -- discriminant constraint has been analyzed in the
+ -- context of the original subtype indication, but for
+ -- itypes the constraint might not have been analyzed
+ -- yet, and this must be done now.
else
- Rewrite (N, New_Copy (Node (Dcon)));
+ Rewrite (N, New_Copy_Tree (Node (Dcon)));
+ Analyze_And_Resolve (N);
Set_Is_Static_Expression (N, False);
return;
end if;
Ptp : Entity_Id := Etype (Pfx);
function Is_Procedure_Actual (N : Node_Id) return Boolean;
- -- Check whether context is a procedure call, in which case
- -- expansion of a bit-packed slice is deferred until the call
- -- itself is expanded.
+ -- 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
Par : Node_Id := Parent (N);
begin
- while Present (Par)
- and then Nkind (Par) not in N_Statement_Other_Than_Procedure_Call
loop
+ -- If our parent is a procedure call we can return
+
if Nkind (Par) = N_Procedure_Call_Statement then
return True;
- else
+
+ -- 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.
+
+ elsif Nkind (Par) = N_Type_Conversion
+ or else Nkind (Par) = N_Parameter_Association
+ or else Nkind (Par) = N_Qualified_Expression
+ then
Par := Parent (Par);
+
+ -- Any other case is not what we are looking for
+
+ else
+ return False;
end if;
end loop;
-
- return False;
end Is_Procedure_Actual;
--------------------
if Is_Access_Type (Ptp) then
- -- Check for explicit dereference required for checked pool
-
- Insert_Dereference_Action (Pfx);
-
- -- 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.
-
Ptp := Designated_Type (Ptp);
- if Is_Array_Type (Ptp) and then Is_Packed (Ptp) then
- Rewrite (Pfx,
- Make_Explicit_Dereference (Sloc (N),
- Prefix => Relocate_Node (Pfx)));
+ Rewrite (Pfx,
+ Make_Explicit_Dereference (Sloc (N),
+ Prefix => Relocate_Node (Pfx)));
- Analyze_And_Resolve (Pfx, Ptp);
- end if;
+ Analyze_And_Resolve (Pfx, Ptp);
end if;
-- Range checks are potentially also needed for cases involving
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;
-- ityp (x)
- -- with the Float_Truncate flag set. This is clearly more efficient.
+ -- with the Float_Truncate flag set. This is clearly more efficient
if Nkind (Operand) = N_Attribute_Reference
and then Attribute_Name (Operand) = Name_Truncation
-- 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
-- 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.
-- 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);
- Generate_Range_Check
- (Expr, Target_Type, CE_Range_Check_Failed);
+ 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;
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
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,
- Reason => PE_Unchecked_Union_Restriction);
- Set_Etype (Result, Standard_Boolean);
- return Result;
-
- else
- Insert_Action (Lhs,
- Make_Raise_Program_Error (Loc,
- Reason => PE_Unchecked_Union_Restriction));
- 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));
function Get_Allocator_Final_List
(N : Node_Id;
T : Entity_Id;
- PtrT : Entity_Id)
- return Entity_Id
+ PtrT : Entity_Id) return Entity_Id
is
Loc : constant Source_Ptr := Sloc (N);
- Acc : Entity_Id;
- begin
- -- If the context is an access parameter, we need to create
- -- a non-anonymous access type in order to have a usable
- -- final list, because there is otherwise no pool to which
- -- the allocated object can belong. We create both the type
- -- and the finalization chain here, because freezing an
- -- internal type does not create such a chain. The Final_Chain
- -- that is thus created is shared by the access parameter.
+ Owner : Entity_Id := PtrT;
+ -- The entity whose finalisation list must be used to attach the
+ -- allocated object.
+ begin
if Ekind (PtrT) = E_Anonymous_Access_Type then
- Acc := Make_Defining_Identifier (Loc, New_Internal_Name ('J'));
- 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))));
+ if Nkind (Associated_Node_For_Itype (PtrT))
+ in N_Subprogram_Specification
+ then
+ -- If the context is an access parameter, we need to create
+ -- a non-anonymous access type in order to have a usable
+ -- final list, because there is otherwise no pool to which
+ -- the allocated object can belong. We create both the type
+ -- and the finalization chain here, because freezing an
+ -- internal type does not create such a chain. The Final_Chain
+ -- that is thus created is shared by the access parameter.
+
+ Owner := Make_Defining_Identifier (Loc, New_Internal_Name ('J'));
+ Insert_Action (N,
+ Make_Full_Type_Declaration (Loc,
+ Defining_Identifier => Owner,
+ Type_Definition =>
+ Make_Access_To_Object_Definition (Loc,
+ Subtype_Indication =>
+ New_Occurrence_Of (T, Loc))));
- Build_Final_List (N, Acc);
- Set_Associated_Final_Chain (PtrT, Associated_Final_Chain (Acc));
- return Find_Final_List (Acc);
+ Build_Final_List (N, Owner);
+ Set_Associated_Final_Chain (PtrT, Associated_Final_Chain (Owner));
- else
- return Find_Final_List (PtrT);
+ else
+ -- Case of an access discriminant, or (Ada 2005) of
+ -- an anonymous access component: find the final list
+ -- associated with the scope of the type.
+
+ 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 (N) = N_Identifier
+ or else
+ Nkind (N) = 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;
-- 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);
-- 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);
----------------------------
function Safe_In_Place_Array_Op
- (Lhs : Node_Id;
- Op1 : Node_Id;
- Op2 : Node_Id)
- return Boolean
+ (Lhs : Node_Id;
+ Op1 : Node_Id;
+ Op2 : Node_Id) return Boolean
is
Target : Entity_Id;
-- is safe. The operand can be empty in the case of negation.
function Is_Unaliased (N : Node_Id) return Boolean;
- -- Check that N is a stand-alone entity.
+ -- Check that N is a stand-alone entity
------------------
-- Is_Unaliased --
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
Action => CW_Membership,
Args => New_List (
Obj_Tag,
- New_Reference_To (
- Access_Disp_Table (Root_Type (Right_Type)), Loc)));
+ New_Reference_To
+ (Node (First_Elmt
+ (Access_Disp_Table (Root_Type (Right_Type)))),
+ Loc)));
else
return
Make_Op_Eq (Loc,
Left_Opnd => Obj_Tag,
Right_Opnd =>
- New_Reference_To (Access_Disp_Table (Right_Type), Loc));
+ New_Reference_To
+ (Node (First_Elmt (Access_Disp_Table (Right_Type))), Loc));
end if;
end Tagged_Membership;
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