OpenCores
URL https://opencores.org/ocsvn/openrisc/openrisc/trunk

Subversion Repositories openrisc

[/] [openrisc/] [trunk/] [gnu-stable/] [gcc-4.5.1/] [gcc/] [c-convert.c] - Blame information for rev 859

Go to most recent revision | Details | Compare with Previous | View Log

Line No. Rev Author Line
1 280 jeremybenn
/* Language-level data type conversion for GNU C.
2
   Copyright (C) 1987, 1988, 1991, 1998, 2002, 2003, 2004, 2005, 2007, 2008,
3
   2009 Free Software Foundation, Inc.
4
 
5
This file is part of GCC.
6
 
7
GCC is free software; you can redistribute it and/or modify it under
8
the terms of the GNU General Public License as published by the Free
9
Software Foundation; either version 3, or (at your option) any later
10
version.
11
 
12
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13
WARRANTY; without even the implied warranty of MERCHANTABILITY or
14
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
15
for more details.
16
 
17
You should have received a copy of the GNU General Public License
18
along with GCC; see the file COPYING3.  If not see
19
<http://www.gnu.org/licenses/>.  */
20
 
21
 
22
/* This file contains the functions for converting C expressions
23
   to different data types.  The only entry point is `convert'.
24
   Every language front end must have a `convert' function
25
   but what kind of conversions it does will depend on the language.  */
26
 
27
#include "config.h"
28
#include "system.h"
29
#include "coretypes.h"
30
#include "tm.h"
31
#include "tree.h"
32
#include "flags.h"
33
#include "convert.h"
34
#include "c-common.h"
35
#include "c-tree.h"
36
#include "langhooks.h"
37
#include "toplev.h"
38
#include "target.h"
39
 
40
/* Change of width--truncation and extension of integers or reals--
41
   is represented with NOP_EXPR.  Proper functioning of many things
42
   assumes that no other conversions can be NOP_EXPRs.
43
 
44
   Conversion between integer and pointer is represented with CONVERT_EXPR.
45
   Converting integer to real uses FLOAT_EXPR
46
   and real to integer uses FIX_TRUNC_EXPR.
47
 
48
   Here is a list of all the functions that assume that widening and
49
   narrowing is always done with a NOP_EXPR:
50
     In convert.c, convert_to_integer.
51
     In c-typeck.c, build_binary_op (boolean ops), and
52
        c_common_truthvalue_conversion.
53
     In expr.c: expand_expr, for operands of a MULT_EXPR.
54
     In fold-const.c: fold.
55
     In tree.c: get_narrower and get_unwidened.  */
56
 
57
/* Subroutines of `convert'.  */
58
 
59
 
60
 
61
/* Create an expression whose value is that of EXPR,
62
   converted to type TYPE.  The TREE_TYPE of the value
63
   is always TYPE.  This function implements all reasonable
64
   conversions; callers should filter out those that are
65
   not permitted by the language being compiled.  */
66
 
67
tree
68
convert (tree type, tree expr)
69
{
70
  tree e = expr;
71
  enum tree_code code = TREE_CODE (type);
72
  const char *invalid_conv_diag;
73
  tree ret;
74
  location_t loc = EXPR_LOCATION (expr);
75
 
76
  if (type == error_mark_node
77
      || expr == error_mark_node
78
      || TREE_TYPE (expr) == error_mark_node)
79
    return error_mark_node;
80
 
81
  if ((invalid_conv_diag
82
       = targetm.invalid_conversion (TREE_TYPE (expr), type)))
83
    {
84
      error (invalid_conv_diag);
85
      return error_mark_node;
86
    }
87
 
88
  if (type == TREE_TYPE (expr))
89
    return expr;
90
  ret = targetm.convert_to_type (type, expr);
91
  if (ret)
92
      return ret;
93
 
94
  STRIP_TYPE_NOPS (e);
95
 
96
  if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (TREE_TYPE (expr)))
97
    return fold_convert_loc (loc, type, expr);
98
  if (TREE_CODE (TREE_TYPE (expr)) == ERROR_MARK)
99
    return error_mark_node;
100
  if (TREE_CODE (TREE_TYPE (expr)) == VOID_TYPE)
101
    {
102
      error ("void value not ignored as it ought to be");
103
      return error_mark_node;
104
    }
105
 
106
  switch (code)
107
    {
108
    case VOID_TYPE:
109
      return fold_convert_loc (loc, type, e);
110
 
111
    case INTEGER_TYPE:
112
    case ENUMERAL_TYPE:
113
      ret = convert_to_integer (type, e);
114
      goto maybe_fold;
115
 
116
    case BOOLEAN_TYPE:
117
      return fold_convert_loc
118
        (loc, type, c_objc_common_truthvalue_conversion (input_location, expr));
119
 
120
    case POINTER_TYPE:
121
    case REFERENCE_TYPE:
122
      ret = convert_to_pointer (type, e);
123
      goto maybe_fold;
124
 
125
    case REAL_TYPE:
126
      ret = convert_to_real (type, e);
127
      goto maybe_fold;
128
 
129
    case FIXED_POINT_TYPE:
130
      ret = convert_to_fixed (type, e);
131
      goto maybe_fold;
132
 
133
    case COMPLEX_TYPE:
134
      ret = convert_to_complex (type, e);
135
      goto maybe_fold;
136
 
137
    case VECTOR_TYPE:
138
      ret = convert_to_vector (type, e);
139
      goto maybe_fold;
140
 
141
    case RECORD_TYPE:
142
    case UNION_TYPE:
143
      if (lang_hooks.types_compatible_p (type, TREE_TYPE (expr)))
144
        return e;
145
      break;
146
 
147
    default:
148
      break;
149
 
150
    maybe_fold:
151
      if (TREE_CODE (ret) != C_MAYBE_CONST_EXPR)
152
        ret = fold (ret);
153
      return ret;
154
    }
155
 
156
  error ("conversion to non-scalar type requested");
157
  return error_mark_node;
158
}

powered by: WebSVN 2.1.0

© copyright 1999-2024 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.