| 1 | /* GDB interface for Guile |
| 2 | * Copyright (C) 1996 Mikael Djurfeldt |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License as published by |
| 6 | * the Free Software Foundation; either version 2, or (at your option) |
| 7 | * any later version. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this software; see the file COPYING. If not, write to |
| 16 | * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
| 17 | * |
| 18 | * As a special exception, the Free Software Foundation gives permission |
| 19 | * for additional uses of the text contained in its release of GUILE. |
| 20 | * |
| 21 | * The exception is that, if you link the GUILE library with other files |
| 22 | * to produce an executable, this does not by itself cause the |
| 23 | * resulting executable to be covered by the GNU General Public License. |
| 24 | * Your use of that executable is in no way restricted on account of |
| 25 | * linking the GUILE library code into it. |
| 26 | * |
| 27 | * This exception does not however invalidate any other reasons why |
| 28 | * the executable file might be covered by the GNU General Public License. |
| 29 | * |
| 30 | * This exception applies only to the code released by the |
| 31 | * Free Software Foundation under the name GUILE. If you copy |
| 32 | * code from other Free Software Foundation releases into a copy of |
| 33 | * GUILE, as the General Public License permits, the exception does |
| 34 | * not apply to the code that you add in this way. To avoid misleading |
| 35 | * anyone as to the status of such modified files, you must delete |
| 36 | * this exception notice from them. |
| 37 | * |
| 38 | * If you write modifications of your own for GUILE, it is your choice |
| 39 | * whether to permit this exception to apply to your modifications. |
| 40 | * If you do not wish that, delete this exception notice. |
| 41 | * |
| 42 | * The author can be reached at djurfeldt@nada.kth.se |
| 43 | * Mikael Djurfeldt, SANS/NADA KTH, 10044 STOCKHOLM, SWEDEN |
| 44 | */ |
| 45 | |
| 46 | #include <stdio.h> |
| 47 | #include "_scm.h" |
| 48 | #include "tag.h" |
| 49 | #include "strports.h" |
| 50 | #include "read.h" |
| 51 | #include "eval.h" |
| 52 | #include "chars.h" |
| 53 | |
| 54 | #include "gdbint.h" |
| 55 | \f |
| 56 | /* {Support for debugging with gdb} |
| 57 | * |
| 58 | * TODO: |
| 59 | * |
| 60 | * 1. Redirect outputs |
| 61 | * 2. Catch errors |
| 62 | * 3. Prevent print from causing segmentation fault when given broken pairs |
| 63 | */ |
| 64 | |
| 65 | #include <stdio.h> |
| 66 | #include "_scm.h" |
| 67 | |
| 68 | #define GDB_TYPE SCM |
| 69 | |
| 70 | #include "gdb_interface.h" |
| 71 | |
| 72 | \f |
| 73 | |
| 74 | /* Be carefull when this macro is true. |
| 75 | scm_gc_heap_lock is set during gc. |
| 76 | */ |
| 77 | #define SCM_GC_P (scm_gc_heap_lock) |
| 78 | |
| 79 | /* Macros that encapsulate blocks of code which can be called by the |
| 80 | * debugger. |
| 81 | */ |
| 82 | #define SCM_BEGIN_FOREIGN_BLOCK \ |
| 83 | { \ |
| 84 | old_ints = scm_ints_disabled; scm_ints_disabled = 1; \ |
| 85 | old_gc = scm_block_gc; scm_block_gc = 1; \ |
| 86 | scm_print_carefully_p = 1; \ |
| 87 | } \ |
| 88 | |
| 89 | |
| 90 | #define SCM_END_FOREIGN_BLOCK \ |
| 91 | { \ |
| 92 | scm_print_carefully_p = 0; \ |
| 93 | scm_block_gc = old_gc; \ |
| 94 | scm_ints_disabled = old_ints; \ |
| 95 | } \ |
| 96 | |
| 97 | |
| 98 | #define RESET_STRING { gdb_output_length = 0; } |
| 99 | |
| 100 | #define SEND_STRING(str) \ |
| 101 | { \ |
| 102 | gdb_output = str; \ |
| 103 | gdb_output_length = strlen (str); \ |
| 104 | } \ |
| 105 | |
| 106 | |
| 107 | /* {Gdb interface} |
| 108 | */ |
| 109 | |
| 110 | unsigned short gdb_options = GDB_HAVE_BINDINGS; |
| 111 | |
| 112 | char *gdb_language = "lisp/c"; |
| 113 | |
| 114 | SCM gdb_result; |
| 115 | |
| 116 | char *gdb_output; |
| 117 | |
| 118 | int gdb_output_length; |
| 119 | |
| 120 | int scm_print_carefully_p; |
| 121 | |
| 122 | static SCM gdb_input_port; |
| 123 | static int port_mark_p, stream_mark_p, string_mark_p; |
| 124 | |
| 125 | static SCM tok_buf; |
| 126 | static int tok_buf_mark_p; |
| 127 | |
| 128 | static SCM gdb_output_port; |
| 129 | static int old_ints, old_gc; |
| 130 | |
| 131 | |
| 132 | static void unmark_port SCM_P ((SCM port)); |
| 133 | |
| 134 | static void |
| 135 | unmark_port (port) |
| 136 | SCM port; |
| 137 | { |
| 138 | SCM stream, string; |
| 139 | port_mark_p = SCM_GC8MARKP (port); |
| 140 | SCM_CLRGC8MARK (port); |
| 141 | stream = SCM_STREAM (port); |
| 142 | stream_mark_p = SCM_GCMARKP (stream); |
| 143 | SCM_CLRGCMARK (stream); |
| 144 | string = SCM_CDR (stream); |
| 145 | string_mark_p = SCM_GC8MARKP (string); |
| 146 | SCM_CLRGC8MARK (string); |
| 147 | } |
| 148 | |
| 149 | |
| 150 | static void remark_port SCM_P ((SCM port)); |
| 151 | |
| 152 | static void |
| 153 | remark_port (port) |
| 154 | SCM port; |
| 155 | { |
| 156 | SCM stream = SCM_STREAM (port); |
| 157 | SCM string = SCM_CDR (stream); |
| 158 | if (string_mark_p) SCM_SETGC8MARK (string); |
| 159 | if (stream_mark_p) SCM_SETGCMARK (stream); |
| 160 | if (port_mark_p) SCM_SETGC8MARK (port); |
| 161 | } |
| 162 | |
| 163 | |
| 164 | int |
| 165 | gdb_maybe_valid_type_p (value) |
| 166 | SCM value; |
| 167 | { |
| 168 | if (SCM_IMP (value) || scm_cellp (value)) |
| 169 | return scm_tag (value) != SCM_MAKINUM (-1); |
| 170 | return 0; |
| 171 | } |
| 172 | |
| 173 | |
| 174 | int |
| 175 | gdb_read (str) |
| 176 | char *str; |
| 177 | { |
| 178 | SCM ans; |
| 179 | int status = 0; |
| 180 | RESET_STRING; |
| 181 | /* Need to be restrictive about what to read? */ |
| 182 | if (SCM_GC_P) |
| 183 | { |
| 184 | char *p; |
| 185 | for (p = str; *p != '\0'; ++p) |
| 186 | switch (*p) |
| 187 | { |
| 188 | case '(': |
| 189 | case '\'': |
| 190 | case '"': |
| 191 | SEND_STRING ("Can't read this kind of expressions during gc"); |
| 192 | return -1; |
| 193 | case '#': |
| 194 | if (*++p == '\0') |
| 195 | goto premature; |
| 196 | if (*p == '\\') |
| 197 | { |
| 198 | if (*++p != '\0') |
| 199 | continue; |
| 200 | premature: |
| 201 | SEND_STRING ("Premature end of lisp expression"); |
| 202 | return -1; |
| 203 | } |
| 204 | default: |
| 205 | continue; |
| 206 | } |
| 207 | } |
| 208 | SCM_BEGIN_FOREIGN_BLOCK; |
| 209 | unmark_port (gdb_input_port); |
| 210 | /* Replace string in input port and reset stream */ |
| 211 | ans = SCM_CDR (SCM_STREAM (gdb_input_port)); |
| 212 | SCM_SETCHARS (ans, str); |
| 213 | SCM_SETLENGTH (ans, strlen (str), scm_tc7_string); |
| 214 | SCM_SETCAR (SCM_STREAM (gdb_input_port), SCM_INUM0); |
| 215 | /* Read one object */ |
| 216 | tok_buf_mark_p = SCM_GC8MARKP (tok_buf); |
| 217 | SCM_CLRGC8MARK (tok_buf); |
| 218 | ans = scm_lreadr (&tok_buf, gdb_input_port, 0, SCM_BOOL_F, &ans); |
| 219 | if (SCM_GC_P) |
| 220 | { |
| 221 | if (SCM_NIMP (ans)) |
| 222 | { |
| 223 | SEND_STRING ("Non-immediate created during gc. Memory may be trashed."); |
| 224 | status = -1; |
| 225 | goto exit; |
| 226 | } |
| 227 | } |
| 228 | gdb_result = ans; |
| 229 | /* Protect answer from future GC */ |
| 230 | if (SCM_NIMP (ans)) |
| 231 | scm_permanent_object (ans); |
| 232 | exit: |
| 233 | if (tok_buf_mark_p) |
| 234 | SCM_SETGC8MARK (tok_buf); |
| 235 | remark_port (gdb_input_port); |
| 236 | SCM_END_FOREIGN_BLOCK; |
| 237 | return status; |
| 238 | } |
| 239 | |
| 240 | |
| 241 | int |
| 242 | gdb_eval (exp) |
| 243 | SCM exp; |
| 244 | { |
| 245 | RESET_STRING; |
| 246 | if (SCM_IMP (exp)) |
| 247 | { |
| 248 | gdb_result = exp; |
| 249 | return 0; |
| 250 | } |
| 251 | if (SCM_GC_P) |
| 252 | { |
| 253 | SEND_STRING ("Can't evaluate lisp expressions during gc"); |
| 254 | return -1; |
| 255 | } |
| 256 | SCM_BEGIN_FOREIGN_BLOCK; |
| 257 | { |
| 258 | SCM env = scm_top_level_env (SCM_CDR (scm_top_level_lookup_closure_var)); |
| 259 | gdb_result = scm_permanent_object (scm_ceval (exp, env)); |
| 260 | } |
| 261 | SCM_END_FOREIGN_BLOCK; |
| 262 | return 0; |
| 263 | } |
| 264 | |
| 265 | |
| 266 | int |
| 267 | gdb_print (obj) |
| 268 | SCM obj; |
| 269 | { |
| 270 | RESET_STRING; |
| 271 | SCM_BEGIN_FOREIGN_BLOCK; |
| 272 | /* Reset stream */ |
| 273 | SCM_SETCAR (SCM_STREAM (gdb_output_port), SCM_INUM0); |
| 274 | scm_write (obj, gdb_output_port); |
| 275 | scm_display (SCM_MAKICHR (0), gdb_output_port); |
| 276 | SEND_STRING (SCM_CHARS (SCM_CDR (SCM_STREAM (gdb_output_port)))); |
| 277 | SCM_END_FOREIGN_BLOCK; |
| 278 | return 0; |
| 279 | } |
| 280 | |
| 281 | |
| 282 | int |
| 283 | gdb_binding (name, value) |
| 284 | SCM name; |
| 285 | SCM value; |
| 286 | { |
| 287 | RESET_STRING; |
| 288 | if (SCM_GC_P) |
| 289 | { |
| 290 | SEND_STRING ("Can't create new bindings during gc"); |
| 291 | return -1; |
| 292 | } |
| 293 | SCM_BEGIN_FOREIGN_BLOCK; |
| 294 | { |
| 295 | SCM vcell = scm_sym2vcell (name, |
| 296 | SCM_CDR (scm_top_level_lookup_closure_var), |
| 297 | SCM_BOOL_T); |
| 298 | SCM_SETCDR (vcell, value); |
| 299 | } |
| 300 | SCM_END_FOREIGN_BLOCK; |
| 301 | return 0; |
| 302 | } |
| 303 | |
| 304 | void |
| 305 | scm_init_gdbint () |
| 306 | { |
| 307 | static char *s = "scm_init_gdb_interface"; |
| 308 | SCM port; |
| 309 | |
| 310 | scm_print_carefully_p = 0; |
| 311 | |
| 312 | port = scm_mkstrport (SCM_INUM0, |
| 313 | scm_make_string (SCM_MAKINUM (80), SCM_UNDEFINED), |
| 314 | SCM_OPN | SCM_WRTNG, |
| 315 | s); |
| 316 | gdb_output_port = scm_permanent_object (port); |
| 317 | |
| 318 | port = scm_mkstrport (SCM_INUM0, |
| 319 | scm_make_string (SCM_MAKINUM (0), SCM_UNDEFINED), |
| 320 | SCM_OPN | SCM_RDNG, |
| 321 | s); |
| 322 | gdb_input_port = scm_permanent_object (port); |
| 323 | |
| 324 | tok_buf = scm_permanent_object (scm_makstr (30L, 0)); |
| 325 | } |