/* Language-level data type conversion for GNU C.
- Copyright (C) 1987, 1988, 1991, 1998 Free Software Foundation, Inc.
+ Copyright (C) 1987, 1988, 1991, 1998, 2002, 2003, 2004, 2005, 2007, 2008,
+ 2009 Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
-Software Foundation; either version 2, or (at your option) any later
+Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
for more details.
You should have received a copy of the GNU General Public License
-along with GCC; see the file COPYING. If not, write to the Free
-Software Foundation, 59 Temple Place - Suite 330, Boston, MA
-02111-1307, USA. */
+along with GCC; see the file COPYING3. If not see
+<http://www.gnu.org/licenses/>. */
/* This file contains the functions for converting C expressions
#include "config.h"
#include "system.h"
+#include "coretypes.h"
+#include "tm.h"
#include "tree.h"
#include "flags.h"
#include "convert.h"
+#include "c-family/c-common.h"
+#include "c-tree.h"
+#include "langhooks.h"
#include "toplev.h"
+#include "target.h"
/* Change of width--truncation and extension of integers or reals--
is represented with NOP_EXPR. Proper functioning of many things
Here is a list of all the functions that assume that widening and
narrowing is always done with a NOP_EXPR:
In convert.c, convert_to_integer.
- In c-typeck.c, build_binary_op (boolean ops), and truthvalue_conversion.
+ In c-typeck.c, build_binary_op (boolean ops), and
+ c_common_truthvalue_conversion.
In expr.c: expand_expr, for operands of a MULT_EXPR.
In fold-const.c: fold.
In tree.c: get_narrower and get_unwidened. */
not permitted by the language being compiled. */
tree
-convert (type, expr)
- tree type, expr;
+convert (tree type, tree expr)
{
tree e = expr;
enum tree_code code = TREE_CODE (type);
+ const char *invalid_conv_diag;
+ tree ret;
+ location_t loc = EXPR_LOCATION (expr);
- if (type == TREE_TYPE (expr)
- || TREE_CODE (expr) == ERROR_MARK
- || code == ERROR_MARK || TREE_CODE (TREE_TYPE (expr)) == ERROR_MARK)
+ if (type == error_mark_node
+ || expr == error_mark_node
+ || TREE_TYPE (expr) == error_mark_node)
+ return error_mark_node;
+
+ if ((invalid_conv_diag
+ = targetm.invalid_conversion (TREE_TYPE (expr), type)))
+ {
+ error (invalid_conv_diag);
+ return error_mark_node;
+ }
+
+ if (type == TREE_TYPE (expr))
return expr;
+ ret = targetm.convert_to_type (type, expr);
+ if (ret)
+ return ret;
+
+ STRIP_TYPE_NOPS (e);
if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (TREE_TYPE (expr)))
- return fold (build1 (NOP_EXPR, type, expr));
+ return fold_convert_loc (loc, type, expr);
if (TREE_CODE (TREE_TYPE (expr)) == ERROR_MARK)
return error_mark_node;
if (TREE_CODE (TREE_TYPE (expr)) == VOID_TYPE)
error ("void value not ignored as it ought to be");
return error_mark_node;
}
- if (code == VOID_TYPE)
- return build1 (CONVERT_EXPR, type, e);
-#if 0
- /* This is incorrect. A truncation can't be stripped this way.
- Extensions will be stripped by the use of get_unwidened. */
- if (TREE_CODE (expr) == NOP_EXPR)
- return convert (type, TREE_OPERAND (expr, 0));
-#endif
- if (code == INTEGER_TYPE || code == ENUMERAL_TYPE)
- return fold (convert_to_integer (type, e));
- if (code == BOOLEAN_TYPE)
+
+ switch (code)
{
- tree t = truthvalue_conversion (expr);
- /* If truthvalue_conversion returns a NOP_EXPR, we must fold it here
- to avoid infinite recursion between fold () and convert (). */
- if (TREE_CODE (t) == NOP_EXPR)
- return fold (build1 (NOP_EXPR, type, TREE_OPERAND (t, 0)));
- else
- return fold (build1 (NOP_EXPR, type, t));
+ case VOID_TYPE:
+ return fold_convert_loc (loc, type, e);
+
+ case INTEGER_TYPE:
+ case ENUMERAL_TYPE:
+ ret = convert_to_integer (type, e);
+ goto maybe_fold;
+
+ case BOOLEAN_TYPE:
+ return fold_convert_loc
+ (loc, type, c_objc_common_truthvalue_conversion (input_location, expr));
+
+ case POINTER_TYPE:
+ case REFERENCE_TYPE:
+ ret = convert_to_pointer (type, e);
+ goto maybe_fold;
+
+ case REAL_TYPE:
+ ret = convert_to_real (type, e);
+ goto maybe_fold;
+
+ case FIXED_POINT_TYPE:
+ ret = convert_to_fixed (type, e);
+ goto maybe_fold;
+
+ case COMPLEX_TYPE:
+ ret = convert_to_complex (type, e);
+ goto maybe_fold;
+
+ case VECTOR_TYPE:
+ ret = convert_to_vector (type, e);
+ goto maybe_fold;
+
+ case RECORD_TYPE:
+ case UNION_TYPE:
+ if (lang_hooks.types_compatible_p (type, TREE_TYPE (expr)))
+ return e;
+ break;
+
+ default:
+ break;
+
+ maybe_fold:
+ if (TREE_CODE (ret) != C_MAYBE_CONST_EXPR)
+ ret = fold (ret);
+ return ret;
}
- if (code == POINTER_TYPE || code == REFERENCE_TYPE)
- return fold (convert_to_pointer (type, e));
- if (code == REAL_TYPE)
- return fold (convert_to_real (type, e));
- if (code == COMPLEX_TYPE)
- return fold (convert_to_complex (type, e));
- if (code == VECTOR_TYPE)
- return fold (convert_to_vector (type, e));
error ("conversion to non-scalar type requested");
return error_mark_node;