OpenCores
URL https://opencores.org/ocsvn/openrisc_2011-10-31/openrisc_2011-10-31/trunk

Subversion Repositories openrisc_2011-10-31

[/] [openrisc/] [trunk/] [gnu-src/] [gdb-6.8/] [gdb/] [scm-lang.c] - Blame information for rev 157

Details | Compare with Previous | View Log

Line No. Rev Author Line
1 24 jeremybenn
/* Scheme/Guile language support routines for GDB, the GNU debugger.
2
 
3
   Copyright (C) 1995, 1996, 1998, 2000, 2001, 2002, 2003, 2004, 2005, 2007,
4
   2008 Free Software Foundation, Inc.
5
 
6
   This file is part of GDB.
7
 
8
   This program is free software; you can redistribute it and/or modify
9
   it under the terms of the GNU General Public License as published by
10
   the Free Software Foundation; either version 3 of the License, or
11
   (at your option) any later version.
12
 
13
   This program is distributed in the hope that it will be useful,
14
   but WITHOUT ANY WARRANTY; without even the implied warranty of
15
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16
   GNU General Public License for more details.
17
 
18
   You should have received a copy of the GNU General Public License
19
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
20
 
21
#include "defs.h"
22
#include "symtab.h"
23
#include "gdbtypes.h"
24
#include "expression.h"
25
#include "parser-defs.h"
26
#include "language.h"
27
#include "value.h"
28
#include "c-lang.h"
29
#include "scm-lang.h"
30
#include "scm-tags.h"
31
#include "source.h"
32
#include "gdb_string.h"
33
#include "gdbcore.h"
34
#include "infcall.h"
35
 
36
extern void _initialize_scheme_language (void);
37
static struct value *evaluate_subexp_scm (struct type *, struct expression *,
38
                                      int *, enum noside);
39
static struct value *scm_lookup_name (char *);
40
static int in_eval_c (void);
41
 
42
struct type *builtin_type_scm;
43
 
44
void
45
scm_printchar (int c, struct ui_file *stream)
46
{
47
  fprintf_filtered (stream, "#\\%c", c);
48
}
49
 
50
static void
51
scm_printstr (struct ui_file *stream, const gdb_byte *string,
52
              unsigned int length, int width, int force_ellipses)
53
{
54
  fprintf_filtered (stream, "\"%s\"", string);
55
}
56
 
57
int
58
is_scmvalue_type (struct type *type)
59
{
60
  if (TYPE_NAME (type) && strcmp (TYPE_NAME (type), "SCM") == 0)
61
    {
62
      return 1;
63
    }
64
  return 0;
65
}
66
 
67
/* Get the INDEX'th SCM value, assuming SVALUE is the address
68
   of the 0'th one.  */
69
 
70
LONGEST
71
scm_get_field (LONGEST svalue, int index)
72
{
73
  gdb_byte buffer[20];
74
  read_memory (SCM2PTR (svalue) + index * TYPE_LENGTH (builtin_type_scm),
75
               buffer, TYPE_LENGTH (builtin_type_scm));
76
  return extract_signed_integer (buffer, TYPE_LENGTH (builtin_type_scm));
77
}
78
 
79
/* Unpack a value of type TYPE in buffer VALADDR as an integer
80
   (if CONTEXT == TYPE_CODE_IN), a pointer (CONTEXT == TYPE_CODE_PTR),
81
   or Boolean (CONTEXT == TYPE_CODE_BOOL).  */
82
 
83
LONGEST
84
scm_unpack (struct type *type, const gdb_byte *valaddr, enum type_code context)
85
{
86
  if (is_scmvalue_type (type))
87
    {
88
      LONGEST svalue = extract_signed_integer (valaddr, TYPE_LENGTH (type));
89
      if (context == TYPE_CODE_BOOL)
90
        {
91
          if (svalue == SCM_BOOL_F)
92
            return 0;
93
          else
94
            return 1;
95
        }
96
      switch (7 & (int) svalue)
97
        {
98
        case 2:
99
        case 6:         /* fixnum */
100
          return svalue >> 2;
101
        case 4:         /* other immediate value */
102
          if (SCM_ICHRP (svalue))       /* character */
103
            return SCM_ICHR (svalue);
104
          else if (SCM_IFLAGP (svalue))
105
            {
106
              switch ((int) svalue)
107
                {
108
#ifndef SICP
109
                case SCM_EOL:
110
#endif
111
                case SCM_BOOL_F:
112
                  return 0;
113
                case SCM_BOOL_T:
114
                  return 1;
115
                }
116
            }
117
          error (_("Value can't be converted to integer."));
118
        default:
119
          return svalue;
120
        }
121
    }
122
  else
123
    return unpack_long (type, valaddr);
124
}
125
 
126
/* True if we're correctly in Guile's eval.c (the evaluator and apply). */
127
 
128
static int
129
in_eval_c (void)
130
{
131
  struct symtab_and_line cursal = get_current_source_symtab_and_line ();
132
 
133
  if (cursal.symtab && cursal.symtab->filename)
134
    {
135
      char *filename = cursal.symtab->filename;
136
      int len = strlen (filename);
137
      if (len >= 6 && strcmp (filename + len - 6, "eval.c") == 0)
138
        return 1;
139
    }
140
  return 0;
141
}
142
 
143
/* Lookup a value for the variable named STR.
144
   First lookup in Scheme context (using the scm_lookup_cstr inferior
145
   function), then try lookup_symbol for compiled variables. */
146
 
147
static struct value *
148
scm_lookup_name (char *str)
149
{
150
  struct value *args[3];
151
  int len = strlen (str);
152
  struct value *func;
153
  struct value *val;
154
  struct symbol *sym;
155
  args[0] = value_allocate_space_in_inferior (len);
156
  args[1] = value_from_longest (builtin_type_int, len);
157
  write_memory (value_as_long (args[0]), (gdb_byte *) str, len);
158
 
159
  if (in_eval_c ()
160
      && (sym = lookup_symbol ("env",
161
                               expression_context_block,
162
                               VAR_DOMAIN, (int *) NULL,
163
                               (struct symtab **) NULL)) != NULL)
164
    args[2] = value_of_variable (sym, expression_context_block);
165
  else
166
    /* FIXME in this case, we should try lookup_symbol first */
167
    args[2] = value_from_longest (builtin_type_scm, SCM_EOL);
168
 
169
  func = find_function_in_inferior ("scm_lookup_cstr");
170
  val = call_function_by_hand (func, 3, args);
171
  if (!value_logical_not (val))
172
    return value_ind (val);
173
 
174
  sym = lookup_symbol (str,
175
                       expression_context_block,
176
                       VAR_DOMAIN, (int *) NULL,
177
                       (struct symtab **) NULL);
178
  if (sym)
179
    return value_of_variable (sym, NULL);
180
  error (_("No symbol \"%s\" in current context."), str);
181
}
182
 
183
struct value *
184
scm_evaluate_string (char *str, int len)
185
{
186
  struct value *func;
187
  struct value *addr = value_allocate_space_in_inferior (len + 1);
188
  LONGEST iaddr = value_as_long (addr);
189
  write_memory (iaddr, (gdb_byte *) str, len);
190
  /* FIXME - should find and pass env */
191
  write_memory (iaddr + len, (gdb_byte *) "", 1);
192
  func = find_function_in_inferior ("scm_evstr");
193
  return call_function_by_hand (func, 1, &addr);
194
}
195
 
196
static struct value *
197
evaluate_exp (struct type *expect_type, struct expression *exp,
198
              int *pos, enum noside noside)
199
{
200
  enum exp_opcode op = exp->elts[*pos].opcode;
201
  int len, pc;
202
  char *str;
203
  switch (op)
204
    {
205
    case OP_NAME:
206
      pc = (*pos)++;
207
      len = longest_to_int (exp->elts[pc + 1].longconst);
208
      (*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1);
209
      if (noside == EVAL_SKIP)
210
        goto nosideret;
211
      str = &exp->elts[pc + 2].string;
212
      return scm_lookup_name (str);
213
    case OP_STRING:
214
      pc = (*pos)++;
215
      len = longest_to_int (exp->elts[pc + 1].longconst);
216
      (*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1);
217
      if (noside == EVAL_SKIP)
218
        goto nosideret;
219
      str = &exp->elts[pc + 2].string;
220
      return scm_evaluate_string (str, len);
221
    default:;
222
    }
223
  return evaluate_subexp_standard (expect_type, exp, pos, noside);
224
nosideret:
225
  return value_from_longest (builtin_type_long, (LONGEST) 1);
226
}
227
 
228
const struct exp_descriptor exp_descriptor_scm =
229
{
230
  print_subexp_standard,
231
  operator_length_standard,
232
  op_name_standard,
233
  dump_subexp_body_standard,
234
  evaluate_exp
235
};
236
 
237
const struct language_defn scm_language_defn =
238
{
239
  "scheme",                     /* Language name */
240
  language_scm,
241
  range_check_off,
242
  type_check_off,
243
  case_sensitive_off,
244
  array_row_major,
245
  &exp_descriptor_scm,
246
  scm_parse,
247
  c_error,
248
  null_post_parser,
249
  scm_printchar,                /* Print a character constant */
250
  scm_printstr,                 /* Function to print string constant */
251
  NULL,                         /* Function to print a single character */
252
  c_print_type,                 /* Print a type using appropriate syntax */
253
  scm_val_print,                /* Print a value using appropriate syntax */
254
  scm_value_print,              /* Print a top-level value */
255
  NULL,                         /* Language specific skip_trampoline */
256
  value_of_this,                /* value_of_this */
257
  basic_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */
258
  basic_lookup_transparent_type,/* lookup_transparent_type */
259
  NULL,                         /* Language specific symbol demangler */
260
  NULL,                         /* Language specific class_name_from_physname */
261
  NULL,                         /* expression operators for printing */
262
  1,                            /* c-style arrays */
263
  0,                             /* String lower bound */
264
  default_word_break_characters,
265
  default_make_symbol_completion_list,
266
  c_language_arch_info,
267
  default_print_array_index,
268
  default_pass_by_reference,
269
  LANG_MAGIC
270
};
271
 
272
void
273
_initialize_scheme_language (void)
274
{
275
  add_language (&scm_language_defn);
276
  builtin_type_scm =
277
    init_type (TYPE_CODE_INT,
278
               gdbarch_long_bit (current_gdbarch) / TARGET_CHAR_BIT,
279
               0, "SCM", (struct objfile *) NULL);
280
}

powered by: WebSVN 2.1.0

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