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* gdbint.c: New file: GDB interface.
This commit is contained in:
Mikael Djurfeldt
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0ea7e48032
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1 changed files with 291 additions and 0 deletions
291
libguile/gdbint.c
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291
libguile/gdbint.c
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/* GDB interface for Guile
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* Copyright (C) 1996 Mikael Djurfeldt
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*
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* 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, or (at your option)
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* any later version.
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*
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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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*
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* You should have received a copy of the GNU General Public License
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* along with this software; see the file COPYING. If not, write to
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* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* As a special exception, the Free Software Foundation gives permission
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* for additional uses of the text contained in its release of GUILE.
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*
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* The exception is that, if you link the GUILE library with other files
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* to produce an executable, this does not by itself cause the
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* resulting executable to be covered by the GNU General Public License.
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* Your use of that executable is in no way restricted on account of
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* linking the GUILE library code into it.
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*
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* This exception does not however invalidate any other reasons why
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* the executable file might be covered by the GNU General Public License.
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*
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* This exception applies only to the code released by the
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* Free Software Foundation under the name GUILE. If you copy
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* code from other Free Software Foundation releases into a copy of
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* GUILE, as the General Public License permits, the exception does
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* not apply to the code that you add in this way. To avoid misleading
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* anyone as to the status of such modified files, you must delete
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* this exception notice from them.
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*
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* If you write modifications of your own for GUILE, it is your choice
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* whether to permit this exception to apply to your modifications.
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* If you do not wish that, delete this exception notice.
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*
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* The author can be reached at djurfeldt@nada.kth.se
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* Mikael Djurfeldt, SANS/NADA KTH, 10044 STOCKHOLM, SWEDEN
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*/
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#include <stdio.h>
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#include "_scm.h"
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/* {Support for debugging with gdb}
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*
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* TODO:
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*
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* 1. Redirect outputs
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* 2. Catch errors
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* 3. Prevent print from causing segmentation fault when given broken pairs
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*/
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#include <stdio.h>
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#include "_scm.h"
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#define GDB_TYPE SCM
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#include "gdb_interface.h"
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/* Be carefull when this macro is true.
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scm_gc_heap_lock is set during gc.
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*/
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#define SCM_GC_P (scm_gc_heap_lock)
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/* Macros that encapsulate blocks of code which can be called by the
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* debugger.
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*/
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#define SCM_BEGIN_FOREIGN_BLOCK \
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{ \
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old_ints = scm_ints_disabled; scm_ints_disabled = 1; \
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old_gc = scm_block_gc; scm_block_gc = 1; \
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scm_print_carefully_p = 1; \
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} \
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#define SCM_END_FOREIGN_BLOCK \
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{ \
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scm_print_carefully_p = 0; \
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scm_block_gc = old_gc; \
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scm_ints_disabled = old_ints; \
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} \
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#define RESET_STRING { gdb_output_length = 0; }
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#define SEND_STRING(str) \
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{ \
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gdb_output = str; \
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gdb_output_length = strlen (str); \
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}
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/* {Gdb interface}
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*/
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unsigned short gdb_options = GDB_HAVE_BINDINGS;
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char *gdb_language = "lisp/c";
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SCM gdb_result;
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char *gdb_output;
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int gdb_output_length;
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int scm_print_carefully_p;
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static SCM gdb_input_port;
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static SCM gdb_output_port;
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static int old_ints, old_gc;
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#ifdef __STDC__
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int
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gdb_maybe_valid_type_p (SCM value)
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#else
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int
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gdb_maybe_valid_type_p (value)
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SCM value;
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#endif
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{
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if (SCM_IMP (value) || scm_cellp (value))
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return scm_tag (value) != SCM_MAKINUM (-1);
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return 0;
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}
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#ifdef __STDC__
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int
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gdb_read (char *str)
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#else
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int
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gdb_read (str)
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char *str;
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#endif
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{
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SCM ans;
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int status = 0;
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RESET_STRING;
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/* Need to be restrictive about what to read? */
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if (SCM_GC_P)
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{
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char *p;
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for (p = str; *p != '\0'; ++p)
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switch (*p)
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{
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case '(':
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case '\'':
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case '"':
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SEND_STRING ("Can't read this kind of expressions during gc");
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return -1;
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case '#':
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if (*++p == '\0')
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goto premature;
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if (*p == '\\')
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{
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if (*++p != '\0')
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continue;
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premature:
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SEND_STRING ("Premature end of lisp expression");
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return -1;
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}
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default:
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continue;
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}
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}
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SCM_BEGIN_FOREIGN_BLOCK;
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/* Replace string in input port and reset stream */
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ans = SCM_CDR (SCM_STREAM (gdb_input_port));
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SCM_SETCHARS (ans, str);
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SCM_SETLENGTH (ans, strlen (str), scm_tc7_string);
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SCM_SETCAR (SCM_STREAM (gdb_input_port), SCM_INUM0);
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/* Read one object */
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ans = scm_read (gdb_input_port, SCM_UNDEFINED, SCM_UNDEFINED);
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if (SCM_GC_P)
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{
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if (!SCM_IMP (ans))
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{
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SEND_STRING ("Non-immediate created during gc. Memory may be trashed.");
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status = -1;
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goto exit;
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}
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}
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/* Protect answer from future GC */
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gdb_result = scm_permanent_object (ans);;
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exit:
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SCM_END_FOREIGN_BLOCK;
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return status;
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}
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#ifdef __STDC__
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int
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gdb_eval (SCM exp)
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#else
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int
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gdb_eval (exp)
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SCM exp;
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#endif
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{
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RESET_STRING;
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if (SCM_IMP (exp))
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{
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gdb_result = exp;
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return 0;
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}
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if (SCM_GC_P)
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{
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SEND_STRING ("Can't evaluate lisp expressions during gc");
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return -1;
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}
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SCM_BEGIN_FOREIGN_BLOCK;
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{
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SCM env = scm_top_level_env (SCM_CDR (scm_top_level_lookup_thunk_var));
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gdb_result = scm_permanent_object (scm_ceval (exp, env));
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}
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SCM_END_FOREIGN_BLOCK;
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return 0;
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}
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#ifdef __STDC__
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int
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gdb_print (SCM obj)
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#else
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int
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gdb_print (obj)
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SCM obj;
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#endif
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{
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RESET_STRING;
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SCM_BEGIN_FOREIGN_BLOCK;
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/* Reset stream */
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SCM_SETCAR (SCM_STREAM (gdb_output_port), SCM_INUM0);
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scm_write (obj, gdb_output_port);
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scm_display (SCM_MAKICHR (0), gdb_output_port);
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SEND_STRING (SCM_CHARS (SCM_CDR (SCM_STREAM (gdb_output_port))));
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SCM_END_FOREIGN_BLOCK;
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return 0;
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}
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#ifdef __STDC__
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int
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gdb_binding (SCM name, SCM value)
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#else
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int
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gdb_binding (name, value)
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SCM name;
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SCM value;
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#endif
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{
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RESET_STRING;
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if (SCM_GC_P)
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{
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SEND_STRING ("Can't create new bindings during gc");
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return -1;
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}
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SCM_BEGIN_FOREIGN_BLOCK;
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{
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SCM vcell = scm_sym2vcell (name,
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SCM_CDR (scm_top_level_lookup_thunk_var),
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SCM_BOOL_T);
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SCM_SETCDR (vcell, value);
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}
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SCM_END_FOREIGN_BLOCK;
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return 0;
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}
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void
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scm_init_gdbint ()
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{
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static char *s = "scm_init_gdb_interface";
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SCM port;
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scm_print_carefully_p = 0;
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port = scm_mkstrport (SCM_INUM0,
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scm_make_string (SCM_MAKINUM (80), SCM_UNDEFINED),
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SCM_OPN | SCM_WRTNG,
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s);
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gdb_output_port = scm_permanent_object (port);
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port = scm_mkstrport (SCM_INUM0,
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scm_make_string (SCM_MAKINUM (0), SCM_UNDEFINED),
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SCM_OPN | SCM_RDNG,
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s);
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gdb_input_port = scm_permanent_object (port);
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}
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