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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-7.1/] [gdb/] [scm-lang.c] - Blame information for rev 227

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1 227 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
 
21
#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"
36
 
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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{
52
  fprintf_filtered (stream, "\"%s\"", string);
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}
54
 
55
int
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is_scmvalue_type (struct type *type)
57
{
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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.  */
67
 
68
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).  */
80
 
81
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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90
      if (context == TYPE_CODE_BOOL)
91
        {
92
          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:
120
          return svalue;
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        }
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    }
123
  else
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    return unpack_long (type, valaddr);
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}
126
 
127
/* True if we're correctly in Guile's eval.c (the evaluator and apply). */
128
 
129
static int
130
in_eval_c (void)
131
{
132
  struct symtab_and_line cursal = get_current_source_symtab_and_line ();
133
 
134
  if (cursal.symtab && cursal.symtab->filename)
135
    {
136
      char *filename = cursal.symtab->filename;
137
      int len = strlen (filename);
138
      if (len >= 6 && strcmp (filename + len - 6, "eval.c") == 0)
139
        return 1;
140
    }
141
  return 0;
142
}
143
 
144
/* Lookup a value for the variable named STR.
145
   First lookup in Scheme context (using the scm_lookup_cstr inferior
146
   function), then try lookup_symbol for compiled variables. */
147
 
148
static struct value *
149
scm_lookup_name (struct gdbarch *gdbarch, char *str)
150
{
151
  struct value *args[3];
152
  int len = strlen (str);
153
  struct value *func;
154
  struct value *val;
155
  struct symbol *sym;
156
 
157
  func = find_function_in_inferior ("scm_lookup_cstr", NULL);
158
 
159
  args[0] = value_allocate_space_in_inferior (len);
160
  args[1] = value_from_longest (builtin_type (gdbarch)->builtin_int, len);
161
  write_memory (value_as_long (args[0]), (gdb_byte *) str, len);
162
 
163
  if (in_eval_c ()
164
      && (sym = lookup_symbol ("env",
165
                               expression_context_block,
166
                               VAR_DOMAIN, (int *) NULL)) != NULL)
167
    args[2] = value_of_variable (sym, expression_context_block);
168
  else
169
    /* FIXME in this case, we should try lookup_symbol first */
170
    args[2] = value_from_longest (builtin_scm_type (gdbarch)->builtin_scm,
171
                                  SCM_EOL);
172
 
173
  val = call_function_by_hand (func, 3, args);
174
  if (!value_logical_not (val))
175
    return value_ind (val);
176
 
177
  sym = lookup_symbol (str,
178
                       expression_context_block,
179
                       VAR_DOMAIN, (int *) NULL);
180
  if (sym)
181
    return value_of_variable (sym, NULL);
182
  error (_("No symbol \"%s\" in current context."), str);
183
}
184
 
185
struct value *
186
scm_evaluate_string (char *str, int len)
187
{
188
  struct value *func;
189
  struct value *addr = value_allocate_space_in_inferior (len + 1);
190
  LONGEST iaddr = value_as_long (addr);
191
  write_memory (iaddr, (gdb_byte *) str, len);
192
  /* FIXME - should find and pass env */
193
  write_memory (iaddr + len, (gdb_byte *) "", 1);
194
  func = find_function_in_inferior ("scm_evstr", NULL);
195
  return call_function_by_hand (func, 1, &addr);
196
}
197
 
198
static struct value *
199
evaluate_exp (struct type *expect_type, struct expression *exp,
200
              int *pos, enum noside noside)
201
{
202
  enum exp_opcode op = exp->elts[*pos].opcode;
203
  int len, pc;
204
  char *str;
205
  switch (op)
206
    {
207
    case OP_NAME:
208
      pc = (*pos)++;
209
      len = longest_to_int (exp->elts[pc + 1].longconst);
210
      (*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1);
211
      if (noside == EVAL_SKIP)
212
        goto nosideret;
213
      str = &exp->elts[pc + 2].string;
214
      return scm_lookup_name (exp->gdbarch, str);
215
    case OP_STRING:
216
      pc = (*pos)++;
217
      len = longest_to_int (exp->elts[pc + 1].longconst);
218
      (*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1);
219
      if (noside == EVAL_SKIP)
220
        goto nosideret;
221
      str = &exp->elts[pc + 2].string;
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      return scm_evaluate_string (str, len);
223
    default:;
224
    }
225
  return evaluate_subexp_standard (expect_type, exp, pos, noside);
226
nosideret:
227
  return value_from_longest (builtin_type (exp->gdbarch)->builtin_int, 1);
228
}
229
 
230
const struct exp_descriptor exp_descriptor_scm =
231
{
232
  print_subexp_standard,
233
  operator_length_standard,
234
  op_name_standard,
235
  dump_subexp_body_standard,
236
  evaluate_exp
237
};
238
 
239
const struct language_defn scm_language_defn =
240
{
241
  "scheme",                     /* Language name */
242
  language_scm,
243
  range_check_off,
244
  type_check_off,
245
  case_sensitive_off,
246
  array_row_major,
247
  macro_expansion_no,
248
  &exp_descriptor_scm,
249
  scm_parse,
250
  c_error,
251
  null_post_parser,
252
  scm_printchar,                /* Print a character constant */
253
  scm_printstr,                 /* Function to print string constant */
254
  NULL,                         /* Function to print a single character */
255
  c_print_type,                 /* Print a type using appropriate syntax */
256
  default_print_typedef,        /* Print a typedef using appropriate syntax */
257
  scm_val_print,                /* Print a value using appropriate syntax */
258
  scm_value_print,              /* Print a top-level value */
259
  NULL,                         /* Language specific skip_trampoline */
260
  NULL,                         /* name_of_this */
261
  basic_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */
262
  basic_lookup_transparent_type,/* lookup_transparent_type */
263
  NULL,                         /* Language specific symbol demangler */
264
  NULL,                         /* Language specific class_name_from_physname */
265
  NULL,                         /* expression operators for printing */
266
  1,                            /* c-style arrays */
267
  0,                             /* String lower bound */
268
  default_word_break_characters,
269
  default_make_symbol_completion_list,
270
  c_language_arch_info,
271
  default_print_array_index,
272
  default_pass_by_reference,
273
  default_get_string,
274
  LANG_MAGIC
275
};
276
 
277
static void *
278
build_scm_types (struct gdbarch *gdbarch)
279
{
280
  struct builtin_scm_type *builtin_scm_type
281
    = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct builtin_scm_type);
282
 
283
  builtin_scm_type->builtin_scm
284
    = arch_integer_type (gdbarch, gdbarch_long_bit (gdbarch), 0, "SCM");
285
 
286
  return builtin_scm_type;
287
}
288
 
289
static struct gdbarch_data *scm_type_data;
290
 
291
const struct builtin_scm_type *
292
builtin_scm_type (struct gdbarch *gdbarch)
293
{
294
  return gdbarch_data (gdbarch, scm_type_data);
295
}
296
 
297
void
298
_initialize_scheme_language (void)
299
{
300
  scm_type_data = gdbarch_data_register_post_init (build_scm_types);
301
 
302
  add_language (&scm_language_defn);
303
}

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