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/* Debugging extensions for Guile
Copyright 1995-2003,2006,2008-2013,2018
Free Software Foundation, Inc.
This file is part of Guile.
Guile is free software: you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published
by the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Guile is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public
License along with Guile. If not, see
<https://www.gnu.org/licenses/>. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <errno.h>
#ifdef HAVE_GETRLIMIT
#include <sys/time.h>
#include <sys/resource.h>
#endif
#ifdef __MINGW32__
# define WIN32_LEAN_AND_MEAN
# include <windows.h>
#endif
#include "alist.h"
#include "async.h"
#include "continuations.h"
#include "dynwind.h"
#include "eval.h"
#include "feature.h"
#include "fluids.h"
#include "gsubr.h"
#include "list.h"
#include "macros.h"
#include "memoize.h"
#include "modules.h"
#include "pairs.h"
#include "ports.h"
#include "private-options.h"
#include "procprop.h"
#include "programs.h"
#include "read.h"
#include "smob.h"
#include "srcprop.h"
#include "stackchk.h"
#include "strports.h"
#include "struct.h"
#include "throw.h"
#include "variable.h"
#include "vm.h"
#include "debug.h"
/*
* Debugging options.
*/
scm_t_option scm_debug_opts[] = {
{ SCM_OPTION_BOOLEAN, "backwards", 0,
"Display backtrace in anti-chronological order." },
{ SCM_OPTION_INTEGER, "width", 79, "Maximal width of backtrace." },
{ SCM_OPTION_INTEGER, "depth", 20, "Maximal length of printed backtrace." },
{ SCM_OPTION_BOOLEAN, "backtrace", 1, "Show backtrace on error." },
/* This default stack limit will be overridden by init_stack_limit(),
if we have getrlimit() and the stack limit is not INFINITY. But it is still
important, as some systems have both the soft and the hard limits set to
INFINITY; in that case we fall back to this value.
The situation is aggravated by certain compilers, which can consume
"beaucoup de stack", as they say in France.
See http://thread.gmane.org/gmane.lisp.guile.devel/8599/focus=8662 for
more discussion. This setting is 640 KB on 32-bit arches (should be enough
for anyone!) or a whoppin' 1280 KB on 64-bit arches.
*/
{ SCM_OPTION_INTEGER, "stack", 160000, "Stack size limit (measured in words; 0 = no check)." },
{ SCM_OPTION_SCM, "show-file-name", SCM_BOOL_T_BITS,
"Show file names and line numbers "
"in backtraces when not `#f'. A value of `base' "
"displays only base names, while `#t' displays full names."},
{ SCM_OPTION_BOOLEAN, "warn-deprecated", 0,
"Warn when deprecated features are used." },
{ 0 },
};
/* {Run time control of the debugging evaluator}
*/
SCM_DEFINE (scm_debug_options, "debug-options-interface", 0, 1, 0,
(SCM setting),
"Option interface for the debug options. Instead of using\n"
"this procedure directly, use the procedures @code{debug-enable},\n"
"@code{debug-disable}, @code{debug-set!} and @code{debug-options}.")
#define FUNC_NAME s_scm_debug_options
{
SCM ans;
ans = scm_options (setting, scm_debug_opts, FUNC_NAME);
scm_stack_checking_enabled_p = SCM_STACK_CHECKING_P;
return ans;
}
#undef FUNC_NAME
#if 0
SCM_REGISTER_PROC (s_reverse_lookup, "reverse-lookup", 2, 0, 0, scm_reverse_lookup);
#endif
SCM
scm_reverse_lookup (SCM env, SCM data)
{
while (scm_is_pair (env) && scm_is_pair (SCM_CAR (env)))
{
SCM names = SCM_CAAR (env);
SCM values = SCM_CDAR (env);
while (scm_is_pair (names))
{
if (scm_is_eq (SCM_CAR (values), data))
return SCM_CAR (names);
names = SCM_CDR (names);
values = SCM_CDR (values);
}
if (!scm_is_null (names) && scm_is_eq (values, data))
return names;
env = SCM_CDR (env);
}
return SCM_BOOL_F;
}
/* Undocumented debugging procedure */
#ifdef GUILE_DEBUG
SCM_DEFINE (scm_debug_hang, "debug-hang", 0, 1, 0,
(SCM obj),
"Go into an endless loop, which can be only terminated with\n"
"a debugger.")
#define FUNC_NAME s_scm_debug_hang
{
int go = 0;
while (!go) ;
return SCM_UNSPECIFIED;
}
#undef FUNC_NAME
#endif
static SCM local_eval_var;
static void
init_local_eval_var (void)
{
local_eval_var = scm_c_public_variable ("ice-9 local-eval", "local-eval");
}
SCM
scm_local_eval (SCM exp, SCM env)
{
static scm_i_pthread_once_t once = SCM_I_PTHREAD_ONCE_INIT;
scm_i_pthread_once (&once, init_local_eval_var);
return scm_call_2 (scm_variable_ref (local_eval_var), exp, env);
}
static void
init_stack_limit (void)
{
#if defined HAVE_GETRLIMIT
struct rlimit lim;
if (getrlimit (RLIMIT_STACK, &lim) == 0)
{
rlim_t bytes = lim.rlim_cur;
/* set our internal stack limit to 80% of the rlimit. */
if (bytes == RLIM_INFINITY)
bytes = lim.rlim_max;
if (bytes != RLIM_INFINITY)
SCM_STACK_LIMIT = bytes * 8 / 10 / sizeof (scm_t_bits);
}
errno = 0;
#elif defined __MINGW32__
MEMORY_BASIC_INFORMATION m;
uintptr_t bytes;
if (VirtualQuery ((LPCVOID) &m, &m, sizeof m))
{
bytes = (DWORD_PTR) m.BaseAddress + m.RegionSize
- (DWORD_PTR) m.AllocationBase;
SCM_STACK_LIMIT = bytes * 8 / 10 / sizeof (scm_t_bits);
}
#endif
}
void
scm_init_debug ()
{
init_stack_limit ();
scm_init_opts (scm_debug_options, scm_debug_opts);
scm_add_feature ("debug-extensions");
#include "debug.x"
}
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