/* 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 GNU CC.
+This file is part of GCC.
-GNU CC 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 version.
+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 3, or (at your option) any later
+version.
-GNU CC is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU General Public License for more details.
+GCC is distributed in the hope that it will be useful, but WITHOUT 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
-along with GNU CC; 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-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)
{
- register tree e = expr;
- register enum tree_code code = TREE_CODE (type);
+ 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 == 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)
- || TREE_CODE (expr) == ERROR_MARK
- || code == ERROR_MARK || TREE_CODE (TREE_TYPE (expr)) == ERROR_MARK)
+ 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 == POINTER_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));
+
+ switch (code)
+ {
+ 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;
+ }
error ("conversion to non-scalar type requested");
return error_mark_node;
OSDN Git Service
