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[/] [or1k/] [trunk/] [insight/] [gdb/] [scm-lang.c] - Blame information for rev 1765

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1 578 markom
/* Scheme/Guile language support routines for GDB, the GNU debugger.
2
   Copyright 1995, 1996, 1998, 2000 Free Software Foundation, Inc.
3
 
4
   This file is part of GDB.
5
 
6
   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 2 of the License, or
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   (at your option) any later version.
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   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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16
   You should have received a copy of the GNU General Public License
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   along with this program; if not, write to the Free Software
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   Foundation, Inc., 59 Temple Place - Suite 330,
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   Boston, MA 02111-1307, USA.  */
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 "gdb_string.h"
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#include "gdbcore.h"
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34
extern void _initialize_scheme_language (void);
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static value_ptr evaluate_subexp_scm (struct type *, struct expression *,
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                                      int *, enum noside);
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static value_ptr scm_lookup_name (char *);
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static int in_eval_c (void);
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static void scm_printstr (struct ui_file * stream, char *string,
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                          unsigned int length, int width,
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                          int force_ellipses);
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extern struct type **CONST_PTR (c_builtin_types[]);
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struct type *builtin_type_scm;
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void
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scm_printchar (int c, 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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static void
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scm_printstr (struct ui_file *stream, char *string, unsigned int length,
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              int width, int force_ellipses)
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{
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  fprintf_filtered (stream, "\"%s\"", string);
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}
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60
int
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is_scmvalue_type (struct type *type)
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{
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  if (TYPE_CODE (type) == TYPE_CODE_INT
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      && 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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}
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/* 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)
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{
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  char buffer[20];
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  read_memory (SCM2PTR (svalue) + index * TYPE_LENGTH (builtin_type_scm),
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               buffer, TYPE_LENGTH (builtin_type_scm));
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  return extract_signed_integer (buffer, TYPE_LENGTH (builtin_type_scm));
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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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LONGEST
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scm_unpack (struct type *type, char *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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      LONGEST svalue = extract_signed_integer (valaddr, TYPE_LENGTH (type));
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      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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}
129
 
130
/* True if we're correctly in Guile's eval.c (the evaluator and apply). */
131
 
132
static int
133
in_eval_c (void)
134
{
135
  if (current_source_symtab && current_source_symtab->filename)
136
    {
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      char *filename = current_source_symtab->filename;
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      int len = strlen (filename);
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      if (len >= 6 && strcmp (filename + len - 6, "eval.c") == 0)
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        return 1;
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    }
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  return 0;
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}
144
 
145
/* Lookup a value for the variable named STR.
146
   First lookup in Scheme context (using the scm_lookup_cstr inferior
147
   function), then try lookup_symbol for compiled variables. */
148
 
149
static value_ptr
150
scm_lookup_name (char *str)
151
{
152
  value_ptr args[3];
153
  int len = strlen (str);
154
  value_ptr func, val;
155
  struct symbol *sym;
156
  args[0] = value_allocate_space_in_inferior (len);
157
  args[1] = value_from_longest (builtin_type_int, len);
158
  write_memory (value_as_long (args[0]), str, len);
159
 
160
  if (in_eval_c ()
161
      && (sym = lookup_symbol ("env",
162
                               expression_context_block,
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                               VAR_NAMESPACE, (int *) NULL,
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                               (struct symtab **) NULL)) != NULL)
165
    args[2] = value_of_variable (sym, expression_context_block);
166
  else
167
    /* FIXME in this case, we should try lookup_symbol first */
168
    args[2] = value_from_longest (builtin_type_scm, SCM_EOL);
169
 
170
  func = find_function_in_inferior ("scm_lookup_cstr");
171
  val = call_function_by_hand (func, 3, args);
172
  if (!value_logical_not (val))
173
    return value_ind (val);
174
 
175
  sym = lookup_symbol (str,
176
                       expression_context_block,
177
                       VAR_NAMESPACE, (int *) NULL,
178
                       (struct symtab **) NULL);
179
  if (sym)
180
    return value_of_variable (sym, NULL);
181
  error ("No symbol \"%s\" in current context.");
182
}
183
 
184
value_ptr
185
scm_evaluate_string (char *str, int len)
186
{
187
  value_ptr func;
188
  value_ptr addr = value_allocate_space_in_inferior (len + 1);
189
  LONGEST iaddr = value_as_long (addr);
190
  write_memory (iaddr, str, len);
191
  /* FIXME - should find and pass env */
192
  write_memory (iaddr + len, "", 1);
193
  func = find_function_in_inferior ("scm_evstr");
194
  return call_function_by_hand (func, 1, &addr);
195
}
196
 
197
static value_ptr
198
evaluate_subexp_scm (struct type *expect_type, register struct expression *exp,
199
                     register int *pos, enum noside noside)
200
{
201
  enum exp_opcode op = exp->elts[*pos].opcode;
202
  int len, pc;
203
  char *str;
204
  switch (op)
205
    {
206
    case OP_NAME:
207
      pc = (*pos)++;
208
      len = longest_to_int (exp->elts[pc + 1].longconst);
209
      (*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1);
210
      if (noside == EVAL_SKIP)
211
        goto nosideret;
212
      str = &exp->elts[pc + 2].string;
213
      return scm_lookup_name (str);
214
    case OP_EXPRSTRING:
215
      pc = (*pos)++;
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      len = longest_to_int (exp->elts[pc + 1].longconst);
217
      (*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1);
218
      if (noside == EVAL_SKIP)
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        goto nosideret;
220
      str = &exp->elts[pc + 2].string;
221
      return scm_evaluate_string (str, len);
222
    default:;
223
    }
224
  return evaluate_subexp_standard (expect_type, exp, pos, noside);
225
nosideret:
226
  return value_from_longest (builtin_type_long, (LONGEST) 1);
227
}
228
 
229
const struct language_defn scm_language_defn =
230
{
231
  "scheme",                     /* Language name */
232
  language_scm,
233
  c_builtin_types,
234
  range_check_off,
235
  type_check_off,
236
  case_sensitive_off,
237
  scm_parse,
238
  c_error,
239
  evaluate_subexp_scm,
240
  scm_printchar,                /* Print a character constant */
241
  scm_printstr,                 /* Function to print string constant */
242
  NULL,                         /* Function to print a single character */
243
  NULL,                         /* Create fundamental type in this language */
244
  c_print_type,                 /* Print a type using appropriate syntax */
245
  scm_val_print,                /* Print a value using appropriate syntax */
246
  scm_value_print,              /* Print a top-level value */
247
  {"", "", "", ""},             /* Binary format info */
248
  {"#o%lo", "#o", "o", ""},     /* Octal format info */
249
  {"%ld", "", "d", ""},         /* Decimal format info */
250
  {"#x%lX", "#X", "X", ""},     /* Hex format info */
251
  NULL,                         /* expression operators for printing */
252
  1,                            /* c-style arrays */
253
  0,                             /* String lower bound */
254
  &builtin_type_char,           /* Type of string elements */
255
  LANG_MAGIC
256
};
257
 
258
void
259
_initialize_scheme_language (void)
260
{
261
  add_language (&scm_language_defn);
262
  builtin_type_scm = init_type (TYPE_CODE_INT,
263
                                TARGET_LONG_BIT / TARGET_CHAR_BIT,
264
                                0, "SCM", (struct objfile *) NULL);
265
}

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