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[/] [openrisc/] [trunk/] [gnu-stable/] [gdb-7.2/] [gdb/] [scm-lang.c] - Blame information for rev 330

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1 330 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,
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   2008, 2009, 2010 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
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   it under the terms of the GNU General Public License as published by
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   the Free Software Foundation; either version 3 of the License, or
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   (at your option) any later version.
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13
   This program is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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   GNU General Public License for more details.
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18
   You should have received a copy of the GNU General Public License
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   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
20
 
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#include "defs.h"
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#include "symtab.h"
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#include "gdbtypes.h"
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#include "expression.h"
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#include "parser-defs.h"
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#include "language.h"
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#include "value.h"
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#include "c-lang.h"
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#include "scm-lang.h"
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#include "scm-tags.h"
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#include "source.h"
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#include "gdb_string.h"
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#include "gdbcore.h"
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#include "infcall.h"
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#include "objfiles.h"
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37
extern void _initialize_scheme_language (void);
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static struct value *scm_lookup_name (struct gdbarch *, char *);
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static int in_eval_c (void);
40
 
41
void
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scm_printchar (int c, struct type *type, struct ui_file *stream)
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{
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  fprintf_filtered (stream, "#\\%c", c);
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}
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47
static void
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scm_printstr (struct ui_file *stream, struct type *type, const gdb_byte *string,
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              unsigned int length, const char *encoding, int force_ellipses,
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              const struct value_print_options *options)
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{
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  fprintf_filtered (stream, "\"%s\"", string);
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}
54
 
55
int
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is_scmvalue_type (struct type *type)
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{
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  if (TYPE_NAME (type) && strcmp (TYPE_NAME (type), "SCM") == 0)
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    {
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      return 1;
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    }
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  return 0;
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}
64
 
65
/* Get the INDEX'th SCM value, assuming SVALUE is the address
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   of the 0'th one.  */
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LONGEST
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scm_get_field (LONGEST svalue, int index, int size,
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               enum bfd_endian byte_order)
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{
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  gdb_byte buffer[20];
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  read_memory (SCM2PTR (svalue) + index * size, buffer, size);
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  return extract_signed_integer (buffer, size, byte_order);
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}
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/* Unpack a value of type TYPE in buffer VALADDR as an integer
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   (if CONTEXT == TYPE_CODE_IN), a pointer (CONTEXT == TYPE_CODE_PTR),
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   or Boolean (CONTEXT == TYPE_CODE_BOOL).  */
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82
LONGEST
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scm_unpack (struct type *type, const gdb_byte *valaddr, enum type_code context)
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{
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  if (is_scmvalue_type (type))
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    {
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      enum bfd_endian byte_order = gdbarch_byte_order (get_type_arch (type));
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      LONGEST svalue
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        = extract_signed_integer (valaddr, TYPE_LENGTH (type), byte_order);
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91
      if (context == TYPE_CODE_BOOL)
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        {
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          if (svalue == SCM_BOOL_F)
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            return 0;
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          else
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            return 1;
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        }
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      switch (7 & (int) svalue)
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        {
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        case 2:
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        case 6:         /* fixnum */
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          return svalue >> 2;
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        case 4:         /* other immediate value */
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          if (SCM_ICHRP (svalue))       /* character */
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            return SCM_ICHR (svalue);
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          else if (SCM_IFLAGP (svalue))
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            {
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              switch ((int) svalue)
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                {
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#ifndef SICP
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                case SCM_EOL:
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#endif
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                case SCM_BOOL_F:
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                  return 0;
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                case SCM_BOOL_T:
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                  return 1;
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                }
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            }
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          error (_("Value can't be converted to integer."));
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        default:
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          return svalue;
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        }
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    }
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  else
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    return unpack_long (type, valaddr);
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}
127
 
128
/* True if we're correctly in Guile's eval.c (the evaluator and apply). */
129
 
130
static int
131
in_eval_c (void)
132
{
133
  struct symtab_and_line cursal = get_current_source_symtab_and_line ();
134
 
135
  if (cursal.symtab && cursal.symtab->filename)
136
    {
137
      char *filename = cursal.symtab->filename;
138
      int len = strlen (filename);
139
 
140
      if (len >= 6 && strcmp (filename + len - 6, "eval.c") == 0)
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        return 1;
142
    }
143
  return 0;
144
}
145
 
146
/* Lookup a value for the variable named STR.
147
   First lookup in Scheme context (using the scm_lookup_cstr inferior
148
   function), then try lookup_symbol for compiled variables. */
149
 
150
static struct value *
151
scm_lookup_name (struct gdbarch *gdbarch, char *str)
152
{
153
  struct value *args[3];
154
  int len = strlen (str);
155
  struct value *func;
156
  struct value *val;
157
  struct symbol *sym;
158
 
159
  func = find_function_in_inferior ("scm_lookup_cstr", NULL);
160
 
161
  args[0] = value_allocate_space_in_inferior (len);
162
  args[1] = value_from_longest (builtin_type (gdbarch)->builtin_int, len);
163
  write_memory (value_as_long (args[0]), (gdb_byte *) str, len);
164
 
165
  if (in_eval_c ()
166
      && (sym = lookup_symbol ("env",
167
                               expression_context_block,
168
                               VAR_DOMAIN, (int *) NULL)) != NULL)
169
    args[2] = value_of_variable (sym, expression_context_block);
170
  else
171
    /* FIXME in this case, we should try lookup_symbol first */
172
    args[2] = value_from_longest (builtin_scm_type (gdbarch)->builtin_scm,
173
                                  SCM_EOL);
174
 
175
  val = call_function_by_hand (func, 3, args);
176
  if (!value_logical_not (val))
177
    return value_ind (val);
178
 
179
  sym = lookup_symbol (str,
180
                       expression_context_block,
181
                       VAR_DOMAIN, (int *) NULL);
182
  if (sym)
183
    return value_of_variable (sym, NULL);
184
  error (_("No symbol \"%s\" in current context."), str);
185
}
186
 
187
struct value *
188
scm_evaluate_string (char *str, int len)
189
{
190
  struct value *func;
191
  struct value *addr = value_allocate_space_in_inferior (len + 1);
192
  LONGEST iaddr = value_as_long (addr);
193
 
194
  write_memory (iaddr, (gdb_byte *) str, len);
195
  /* FIXME - should find and pass env */
196
  write_memory (iaddr + len, (gdb_byte *) "", 1);
197
  func = find_function_in_inferior ("scm_evstr", NULL);
198
  return call_function_by_hand (func, 1, &addr);
199
}
200
 
201
static struct value *
202
evaluate_exp (struct type *expect_type, struct expression *exp,
203
              int *pos, enum noside noside)
204
{
205
  enum exp_opcode op = exp->elts[*pos].opcode;
206
  int len, pc;
207
  char *str;
208
 
209
  switch (op)
210
    {
211
    case OP_NAME:
212
      pc = (*pos)++;
213
      len = longest_to_int (exp->elts[pc + 1].longconst);
214
      (*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1);
215
      if (noside == EVAL_SKIP)
216
        goto nosideret;
217
      str = &exp->elts[pc + 2].string;
218
      return scm_lookup_name (exp->gdbarch, str);
219
    case OP_STRING:
220
      pc = (*pos)++;
221
      len = longest_to_int (exp->elts[pc + 1].longconst);
222
      (*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1);
223
      if (noside == EVAL_SKIP)
224
        goto nosideret;
225
      str = &exp->elts[pc + 2].string;
226
      return scm_evaluate_string (str, len);
227
    default:;
228
    }
229
  return evaluate_subexp_standard (expect_type, exp, pos, noside);
230
nosideret:
231
  return value_from_longest (builtin_type (exp->gdbarch)->builtin_int, 1);
232
}
233
 
234
const struct exp_descriptor exp_descriptor_scm =
235
{
236
  print_subexp_standard,
237
  operator_length_standard,
238
  operator_check_standard,
239
  op_name_standard,
240
  dump_subexp_body_standard,
241
  evaluate_exp
242
};
243
 
244
const struct language_defn scm_language_defn =
245
{
246
  "scheme",                     /* Language name */
247
  language_scm,
248
  range_check_off,
249
  type_check_off,
250
  case_sensitive_off,
251
  array_row_major,
252
  macro_expansion_no,
253
  &exp_descriptor_scm,
254
  scm_parse,
255
  c_error,
256
  null_post_parser,
257
  scm_printchar,                /* Print a character constant */
258
  scm_printstr,                 /* Function to print string constant */
259
  NULL,                         /* Function to print a single character */
260
  c_print_type,                 /* Print a type using appropriate syntax */
261
  default_print_typedef,        /* Print a typedef using appropriate syntax */
262
  scm_val_print,                /* Print a value using appropriate syntax */
263
  scm_value_print,              /* Print a top-level value */
264
  NULL,                         /* Language specific skip_trampoline */
265
  NULL,                         /* name_of_this */
266
  basic_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */
267
  basic_lookup_transparent_type,/* lookup_transparent_type */
268
  NULL,                         /* Language specific symbol demangler */
269
  NULL,                         /* Language specific class_name_from_physname */
270
  NULL,                         /* expression operators for printing */
271
  1,                            /* c-style arrays */
272
  0,                             /* String lower bound */
273
  default_word_break_characters,
274
  default_make_symbol_completion_list,
275
  c_language_arch_info,
276
  default_print_array_index,
277
  default_pass_by_reference,
278
  default_get_string,
279
  LANG_MAGIC
280
};
281
 
282
static void *
283
build_scm_types (struct gdbarch *gdbarch)
284
{
285
  struct builtin_scm_type *builtin_scm_type
286
    = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct builtin_scm_type);
287
 
288
  builtin_scm_type->builtin_scm
289
    = arch_integer_type (gdbarch, gdbarch_long_bit (gdbarch), 0, "SCM");
290
 
291
  return builtin_scm_type;
292
}
293
 
294
static struct gdbarch_data *scm_type_data;
295
 
296
const struct builtin_scm_type *
297
builtin_scm_type (struct gdbarch *gdbarch)
298
{
299
  return gdbarch_data (gdbarch, scm_type_data);
300
}
301
 
302
void
303
_initialize_scheme_language (void)
304
{
305
  scm_type_data = gdbarch_data_register_post_init (build_scm_types);
306
 
307
  add_language (&scm_language_defn);
308
}

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