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|
/* Debugging extensions for Guile
* Copyright (C) 1995, 1996 Mikael Djurfeldt
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this software; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*
* As a special exception, the Free Software Foundation gives permission
* for additional uses of the text contained in its release of GUILE.
*
* The exception is that, if you link the GUILE library with other files
* to produce an executable, this does not by itself cause the
* resulting executable to be covered by the GNU General Public License.
* Your use of that executable is in no way restricted on account of
* linking the GUILE library code into it.
*
* This exception does not however invalidate any other reasons why
* the executable file might be covered by the GNU General Public License.
*
* This exception applies only to the code released by the
* Free Software Foundation under the name GUILE. If you copy
* code from other Free Software Foundation releases into a copy of
* GUILE, as the General Public License permits, the exception does
* not apply to the code that you add in this way. To avoid misleading
* anyone as to the status of such modified files, you must delete
* this exception notice from them.
*
* If you write modifications of your own for GUILE, it is your choice
* whether to permit this exception to apply to your modifications.
* If you do not wish that, delete this exception notice.
*
* The author can be reached at djurfeldt@nada.kth.se
* Mikael Djurfeldt, SANS/NADA KTH, 10044 STOCKHOLM, SWEDEN
*/
#include <stdio.h>
#include "_scm.h"
#include "eval.h"
#include "throw.h"
#include "genio.h"
#include "smob.h"
#include "procprop.h"
#include "srcprop.h"
#include "alist.h"
#include "continuations.h"
#include "strports.h"
#include "read.h"
#include "feature.h"
#include "debug.h"
/* {Run time control of the debugging evaluator}
*/
SCM_PROC (s_debug_options, "debug-options-interface", 0, 1, 0, scm_debug_options);
#ifdef __STDC__
SCM
scm_debug_options (SCM setting)
#else
SCM
scm_debug_options (setting)
SCM setting;
#endif
{
SCM ans;
SCM_DEFER_INTS;
ans = scm_options (setting,
scm_debug_opts,
SCM_N_DEBUG_OPTIONS,
s_debug_options);
#ifndef SCM_RECKLESS
if (!(1 <= SCM_N_FRAMES && SCM_N_FRAMES <= SCM_MAX_FRAME_SIZE))
{
scm_options (ans, scm_debug_opts, SCM_N_DEBUG_OPTIONS, s_debug_options);
/* *fixme* Should SCM_ALLOW_INTS be called here? */
scm_wta (setting, (char *) SCM_OUTOFRANGE, "frames");
}
#endif
SCM_RESET_DEBUG_MODE;
scm_debug_eframe_size = 2 * SCM_N_FRAMES;
SCM_ALLOW_INTS
return ans;
}
SCM_PROC (s_evaluator_traps, "evaluator-traps-interface", 0, 1, 0, scm_evaluator_traps);
#ifdef __STDC__
SCM
scm_evaluator_traps (SCM setting)
#else
SCM
scm_evaluator_traps (setting)
SCM setting;
#endif
{
SCM ans;
SCM_DEFER_INTS;
ans = scm_options (setting,
scm_evaluator_trap_table,
SCM_N_EVALUATOR_TRAPS,
s_evaluator_traps);
SCM_RESET_DEBUG_MODE;
SCM_ALLOW_INTS
return ans;
}
SCM_PROC (s_single_step, "single-step", 2, 0, 0, scm_single_step);
#ifdef __STDC__
SCM
scm_single_step (SCM cont, SCM val)
#else
SCM
scm_single_step (cont, val)
SCM cont, SCM val;
#endif
{
SCM_DEFER_INTS;
SCM_ENTER_FRAME_P = SCM_EXIT_FRAME_P = 1;
SCM_RESET_DEBUG_MODE;
SCM_ALLOW_INTS;
scm_throw (cont, val);
return SCM_BOOL_F; /* never returns */
}
static SCM scm_i_source, scm_i_more;
static SCM scm_i_proc, scm_i_args, scm_i_eval_args;
static SCM scm_i_procname;
/* {Memoized Source}
*/
long scm_tc16_memoized;
#ifdef __STDC__
static int
prinmemoized (SCM obj, SCM port, int writing)
#else
static int
prinmemoized (obj, port, writing)
SCM obj;
SCM port;
int writing;
#endif
{
scm_gen_puts (scm_regular_string, "#<memoized ", port);
scm_iprin1 (scm_unmemoize (obj), port, 1);
scm_gen_putc ('>', port);
return 1;
}
static scm_smobfuns memoizedsmob =
{scm_markcdr, scm_free0, prinmemoized, 0};
SCM_PROC (s_memoized_p, "memoized?", 1, 0, 0, scm_memoized_p);
#ifdef __STDC__
SCM
scm_memoized_p (SCM obj)
#else
SCM
scm_memoized_p (obj)
SCM obj;
#endif
{
return SCM_NIMP (obj) && SCM_MEMOIZEDP (obj) ? SCM_BOOL_T : SCM_BOOL_F;
}
#ifdef __STDC__
SCM
scm_make_memoized (SCM exp, SCM env)
#else
SCM
scm_make_memoized (exp, env)
SCM exp, SCM env;
#endif
{
register SCM z, ans;
SCM_DEFER_INTS;
SCM_NEWCELL (z);
SCM_CAR (z) = exp;
SCM_CDR (z) = env;
SCM_NEWCELL (ans);
SCM_CAR (ans) = scm_tc16_memoized;
SCM_CDR (ans) = z;
SCM_ALLOW_INTS;
return ans;
}
SCM_PROC (s_unmemoize, "unmemoize", 1, 0, 0, scm_unmemoize);
#ifdef __STDC__
SCM
scm_unmemoize (SCM m)
#else
SCM
scm_unmemoize (m)
SCM m;
#endif
{
SCM_ASSERT (SCM_MEMOIZEDP (m), m, SCM_ARG1, s_unmemoize);
return scm_unmemocopy (SCM_MEMOEXP (m), SCM_MEMOENV (m));
}
SCM_PROC (s_memoized_environment, "memoized-environment", 1, 0, 0, scm_memoized_environment);
#ifdef __STDC__
SCM
scm_memoized_environment (SCM m)
#else
SCM
scm_memoized_environment (m)
SCM m;
#endif
{
SCM_ASSERT (SCM_MEMOIZEDP (m), m, SCM_ARG1, s_unmemoize);
return SCM_MEMOENV (m);
}
SCM_PROC (s_procedure_name, "procedure-name", 1, 0, 0, scm_procedure_name);
#ifdef __STDC__
SCM
scm_procedure_name (SCM proc)
#else
SCM
scm_procedure_name (proc)
SCM proc;
#endif
{
SCM_ASSERT(scm_procedure_p (proc) == SCM_BOOL_T,
proc,
SCM_ARG1,
s_procedure_name);
switch (SCM_TYP7 (proc)) {
case scm_tcs_closures:
{
SCM name = scm_procedure_property (proc, scm_i_name);
#if 0
/* Procedure property scm_i_procname not implemented yet... */
SCM name = scm_source_property (SCM_CAR (SCM_CDR (SCM_CODE (proc))), scm_i_procname);
if (SCM_FALSEP (name))
name = scm_procedure_property (proc, scm_i_name);
#endif
return name;
}
case scm_tcs_subrs:
return SCM_SNAME (proc);
default:
return SCM_BOOL_F;
}
}
SCM_PROC (s_procedure_source, "procedure-source", 1, 0, 0, scm_procedure_source);
#ifdef __STDC__
SCM
scm_procedure_source (SCM proc)
#else
SCM
scm_procedure_source (proc)
SCM proc;
#endif
{
SCM_ASSERT(SCM_NIMP (proc), proc, SCM_ARG1, s_procedure_source);
switch (SCM_TYP7 (proc)) {
case scm_tcs_closures:
{
SCM src;
src = scm_source_property (SCM_CDR (SCM_CODE (proc)), scm_i_copy);
if (src != SCM_BOOL_F)
return scm_cons2 (scm_i_lambda, SCM_CAR (SCM_CODE (proc)), src);
src = SCM_CODE (proc);
return scm_cons (scm_i_lambda,
scm_unmemocopy (src,
SCM_EXTEND_SCM_ENV (SCM_CAR (src),
SCM_EOL,
SCM_ENV (proc))));
}
case scm_tc7_contin:
case scm_tcs_subrs:
#ifdef CCLO
case scm_tc7_cclo:
#endif
/* It would indeed be a nice thing if we supplied source even for
built in procedures! */
return scm_procedure_property (proc, scm_i_source);
default:
scm_wta (proc, (char *) SCM_ARG1, s_procedure_source);
return 0;
}
}
SCM_PROC (s_procedure_environment, "procedure-environment", 1, 0, 0, scm_procedure_environment);
#ifdef __STDC__
SCM
scm_procedure_environment (SCM proc)
#else
SCM
scm_procedure_environment (proc)
SCM proc;
#endif
{
SCM_ASSERT (SCM_NIMP (proc), proc, SCM_ARG1, s_procedure_environment);
switch (SCM_TYP7 (proc)) {
case scm_tcs_closures:
return SCM_ENV (proc);
case scm_tc7_contin:
case scm_tcs_subrs:
#ifdef CCLO
case scm_tc7_cclo:
#endif
return SCM_EOL;
default:
scm_wta (proc, (char *) SCM_ARG1, s_procedure_environment);
return 0;
}
}
/* Eval in a local environment. We would like to have the ability to
* evaluate in a specified local environment, but due to the memoization
* this isn't normally possible. We solve it by copying the code before
* evaluating. Probably the best solution would be to have eval.c generate
* yet another evaluator. They are not very big actually.
*/
SCM_PROC (s_local_eval, "local-eval", 2, 0, 0, scm_local_eval);
#ifdef __STDC__
SCM
scm_local_eval (SCM exp, SCM env)
#else
SCM
scm_local_eval (exp, env)
SCM exp;
SCM env;
#endif
{
return scm_eval_3 (exp, 1, env);
}
/* {Stack Frames}
*
* The stack is a list of stackframes, from root to current.
*
* A stackframe is a list of virtual stackframes, which occur due to
* the evaluators tail recursion. A virtual stackframe normally
* corresponds to an eval/apply pair, but macros and special forms
* (which are implemented as macros in scm...) only have eval
* information and apply calls leads to apply only frames.
*
* A virtual stackframe is either a property list or the symbol
* ... which marks the location of virtual stackframes which could not
* be stored with the current debug-depth.
*
* Property Type Description
*
* These three only present in eval frames:
*
* sexpr memoized Source code expression and environment.
* proc procedure The procedure being applied.
* (Not present if pre-apply state.)
* args list The arguments evaluated so far.
* eval-args boolean True if evaluation of arguments not finished.
*/
/* {Debug Objects}
*
* The debugging evaluator throws these on frame traps.
*/
long scm_tc16_debugobj;
#define DEBUGOBJP(x) (scm_tc16_debugobj == SCM_TYP16 (x))
#define DBGFRAME(x) SCM_CDR (x)
#ifdef __STDC__
static int
prindebugobj (SCM obj, SCM port, int writing)
#else
static int
prindebugobj (writing)
SCM obj, SCM port, int writing;
#endif
{
scm_gen_puts (scm_regular_string, "#<debug-object ", port);
scm_intprint (DBGFRAME (obj), 16, port);
scm_gen_putc ('>', port);
return 1;
}
static scm_smobfuns debugobjsmob =
{scm_mark0, scm_free0, prindebugobj, 0};
SCM_PROC (s_debug_object_p, "debug-object?", 1, 0, 0, scm_debug_object_p);
#ifdef __STDC__
SCM
scm_debug_object_p (SCM obj)
#else
SCM
scm_debug_object_p (obj)
SCM obj;
#endif
{
return SCM_NIMP (obj) && DEBUGOBJP (obj) ? SCM_BOOL_T : SCM_BOOL_F;
}
#ifdef __STDC__
SCM
scm_make_debugobj (scm_debug_frame *frame)
#else
SCM
scm_make_debugobj (frame)
scm_debug_frame *frame;
#endif
{
register SCM z;
SCM_DEFER_INTS;
SCM_NEWCELL (z);
SCM_CAR (z) = scm_tc16_debugobj;
DBGFRAME (z) = (SCM) frame;
SCM_ALLOW_INTS;
return z;
}
#ifdef __STDC__
static SCM
_scm_stack_frame_to_plist (scm_debug_frame *frame, long offset)
#else
static SCM
_scm_stack_frame_to_plist (frame, offset)
scm_debug_frame *frame;
long offset;
#endif
{
int size;
scm_debug_info *info;
if (SCM_EVALFRAMEP (*frame))
{
size = frame->status & SCM_MAX_FRAME_SIZE;
info = (scm_debug_info *) (*((SCM_STACKITEM **) &frame->vect[size]) + offset);
if ((info - frame->vect) & 1)
{
/* Debug.vect ends with apply info. */
SCM p;
--info;
if (info[1].a.proc == SCM_UNDEFINED)
p = SCM_EOL;
else
p = scm_acons (scm_i_proc,
info[1].a.proc,
scm_acons (scm_i_args,
info[1].a.args,
SCM_ARGS_READY_P (*frame)
? SCM_EOL
: scm_acons (scm_i_eval_args,
SCM_BOOL_T,
SCM_EOL)));
return scm_acons (scm_i_source,
scm_make_memoized (info[0].e.exp, info[0].e.env),
p);
}
else
/* Debug.vect ends with eval info. */
return scm_acons (scm_i_source,
scm_make_memoized (info[0].e.exp, info[0].e.env),
SCM_EOL);
}
else
return scm_acons (scm_i_proc,
frame->vect[0].a.proc,
scm_acons (scm_i_args, frame->vect[0].a.args, SCM_EOL));
}
SCM_PROC (s_last_stack_frame, "last-stack-frame", 1, 0, 0, scm_last_stack_frame);
#ifdef __STDC__
SCM
scm_last_stack_frame (SCM obj)
#else
SCM
scm_last_stack_frame (obj)
SCM obj;
#endif
{
scm_debug_frame *frame;
long offset = 0;
SCM_ASSERT (SCM_NIMP (obj), obj, SCM_ARG1, s_last_stack_frame);
if (scm_tc16_debugobj == SCM_TYP16 (obj))
frame = (scm_debug_frame *) DBGFRAME (obj);
else if (scm_tc7_contin == SCM_TYP7 (obj))
{
frame = SCM_DFRAME (obj);
offset = (SCM_STACKITEM *) (SCM_CHARS (obj) + sizeof (regs)) - SCM_BASE (obj);
#ifndef STACK_GROWS_UP
offset += SCM_LENGTH (obj);
#endif
}
else scm_wta (obj, (char *) SCM_ARG1, s_last_stack_frame);
if (!frame)
return SCM_BOOL_F;
return _scm_stack_frame_to_plist ((scm_debug_frame *) ((SCM_STACKITEM *) frame + offset), offset);
}
/* Make a scheme object of the current evaluation stack.
*/
SCM_PROC (s_expr_stack, "expr-stack", 0, 1, 0, scm_expr_stack);
#ifdef __STDC__
SCM
scm_expr_stack (SCM obj)
#else
SCM
scm_expr_stack (obj)
SCM obj;
#endif
{
SCM frs = SCM_EOL, vfrs, p;
int size;
int max_vfrs = SCM_BACKTRACE_DEPTH;
scm_debug_info *info;
scm_debug_frame *frame;
long offset = 0;
if (SCM_UNBNDP (obj))
frame = last_debug_info_frame;
else
{
SCM_ASSERT (SCM_NIMP (obj), obj, SCM_ARG1, s_expr_stack);
if (scm_tc16_debugobj == SCM_TYP16 (obj))
frame = (scm_debug_frame *) DBGFRAME (obj);
else if (scm_tc7_contin == SCM_TYP7 (obj))
{
frame = SCM_DFRAME (obj);
offset = (SCM_STACKITEM *) (SCM_CHARS (obj) + sizeof (regs)) - SCM_BASE (obj);
#ifndef STACK_GROWS_UP
offset += SCM_LENGTH (obj);
#endif
}
else scm_wta (obj, (char *) SCM_ARG1, s_expr_stack);
}
for (; frame && max_vfrs > 0; frame = frame->prev)
{
frame = (scm_debug_frame *) ((SCM_STACKITEM *) frame + offset);
p = _scm_stack_frame_to_plist (frame, offset);
if (SCM_EVALFRAMEP (*frame))
{
size = frame->status & SCM_MAX_FRAME_SIZE;
info = (scm_debug_info *) (*((SCM_STACKITEM **) &frame->vect[size]) + offset);
vfrs = SCM_EOL;
if ((info - frame->vect) & 1)
--info;
/* Data in the apply part of an eval info frame comes from
previous stack frame if the scm_debug_info vector is overflowed. */
else if (SCM_OVERFLOWP (*frame)
&& !SCM_UNBNDP (info[1].a.proc))
{
vfrs = scm_cons (p, SCM_EOL);
--max_vfrs;
p = scm_acons (scm_i_proc,
info[1].a.proc,
scm_acons (scm_i_args, info[1].a.args, SCM_EOL));
}
info -= 2;
vfrs = scm_cons (p, vfrs);
--max_vfrs;
if (SCM_OVERFLOWP (*frame))
vfrs = scm_cons (scm_i_more, vfrs);
while (info >= frame->vect)
{
p = SCM_EOL;
if (!SCM_UNBNDP (info[1].a.proc))
p = scm_acons (scm_i_proc,
info[1].a.proc,
scm_acons (scm_i_args, info[1].a.args, SCM_EOL));
p = scm_acons (scm_i_source,
scm_make_memoized (info[0].e.exp, info[0].e.env),
p);
info -= 2;
vfrs = scm_cons (p, vfrs);
--max_vfrs;
}
}
else
{
vfrs = scm_cons (p, SCM_EOL);
--max_vfrs;
}
frs = scm_cons (vfrs, frs);
}
if (max_vfrs <= 0)
frs = scm_cons (scm_i_more, frs);
return frs;
}
void
scm_init_debug ()
{
scm_init_opts (scm_debug_options, scm_debug_opts, SCM_N_DEBUG_OPTIONS);
scm_init_opts (scm_evaluator_traps,
scm_evaluator_trap_table,
SCM_N_EVALUATOR_TRAPS);
scm_tc16_memoized = scm_newsmob (&memoizedsmob);
scm_tc16_debugobj = scm_newsmob (&debugobjsmob);
scm_i_procname = SCM_CAR (scm_sysintern ("procname", SCM_UNDEFINED));
scm_i_more = SCM_CAR (scm_sysintern ("...", SCM_UNDEFINED));
scm_i_source = SCM_CAR (scm_sysintern ("source", SCM_UNDEFINED));
scm_i_proc = SCM_CAR (scm_sysintern ("proc", SCM_UNDEFINED));
scm_i_args = SCM_CAR (scm_sysintern ("args", SCM_UNDEFINED));
scm_i_eval_args = SCM_CAR (scm_sysintern ("eval-args", SCM_UNDEFINED));
scm_add_feature ("debug-extensions");
#include "debug.x"
}
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