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/* Printing of backtraces and error messages
* Copyright (C) 1996,1997,1998,1999,2000,2001 Free Software Foundation
*
* 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, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307 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 <ctype.h>
#include "libguile/_scm.h"
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_IO_H
#include <io.h>
#endif
#include "libguile/stacks.h"
#include "libguile/srcprop.h"
#include "libguile/struct.h"
#include "libguile/strports.h"
#include "libguile/throw.h"
#include "libguile/fluids.h"
#include "libguile/ports.h"
#include "libguile/strings.h"
#include "libguile/validate.h"
#include "libguile/backtrace.h"
#include "libguile/filesys.h"
/* {Error reporting and backtraces}
* (A first approximation.)
*
* Note that these functions shouldn't generate errors themselves.
*/
#ifndef SCM_RECKLESS
#undef SCM_ASSERT
#define SCM_ASSERT(_cond, _arg, _pos, _subr) \
if (!(_cond)) \
return SCM_BOOL_F;
#endif
SCM scm_the_last_stack_fluid_var;
static void
display_header (SCM source, SCM port)
{
if (SCM_MEMOIZEDP (source))
{
SCM fname = scm_source_property (source, scm_sym_filename);
SCM line = scm_source_property (source, scm_sym_line);
SCM col = scm_source_property (source, scm_sym_column);
/* Dirk:FIXME:: Maybe we should store the _port_ rather than the
* filename with the source properties? Then we could in case of
* non-file ports give at least some more details than just
* "<unnamed port>". */
if (SCM_STRINGP (fname))
scm_prin1 (fname, port, 0);
else
scm_puts ("<unnamed port>", port);
if (!SCM_FALSEP (line) && !SCM_FALSEP (col))
{
scm_putc (':', port);
scm_intprint (SCM_INUM (line) + 1, 10, port);
scm_putc (':', port);
scm_intprint (SCM_INUM (col) + 1, 10, port);
}
}
else
scm_puts ("ERROR", port);
scm_puts (": ", port);
}
void
scm_display_error_message (SCM message, SCM args, SCM port)
{
if (SCM_STRINGP (message) && !SCM_FALSEP (scm_list_p (args)))
{
scm_simple_format (port, message, args);
scm_newline (port);
}
else
{
scm_display (message, port);
scm_newline (port);
}
}
static void
display_expression (SCM frame,SCM pname,SCM source,SCM port)
{
SCM print_state = scm_make_print_state ();
scm_print_state *pstate = SCM_PRINT_STATE (print_state);
pstate->writingp = 0;
pstate->fancyp = 1;
pstate->level = 2;
pstate->length = 3;
if (SCM_SYMBOLP (pname) || SCM_STRINGP (pname))
{
if (SCM_FRAMEP (frame)
&& SCM_FRAME_EVAL_ARGS_P (frame))
scm_puts ("While evaluating arguments to ", port);
else
scm_puts ("In procedure ", port);
scm_iprin1 (pname, port, pstate);
if (SCM_MEMOIZEDP (source))
{
scm_puts (" in expression ", port);
pstate->writingp = 1;
scm_iprin1 (scm_unmemoize (source), port, pstate);
}
}
else if (SCM_MEMOIZEDP (source))
{
scm_puts ("In expression ", port);
pstate->writingp = 1;
scm_iprin1 (scm_unmemoize (source), port, pstate);
}
scm_puts (":\n", port);
scm_free_print_state (print_state);
}
struct display_error_args {
SCM stack;
SCM port;
SCM subr;
SCM message;
SCM args;
SCM rest;
};
static SCM
display_error_body (struct display_error_args *a)
{
SCM current_frame = SCM_BOOL_F;
SCM source = SCM_BOOL_F;
SCM prev_frame = SCM_BOOL_F;
SCM pname = a->subr;
if (SCM_DEBUGGINGP
&& SCM_STACKP (a->stack)
&& SCM_STACK_LENGTH (a->stack) > 0)
{
current_frame = scm_stack_ref (a->stack, SCM_INUM0);
source = SCM_FRAME_SOURCE (current_frame);
prev_frame = SCM_FRAME_PREV (current_frame);
if (!SCM_MEMOIZEDP (source) && !SCM_FALSEP (prev_frame))
source = SCM_FRAME_SOURCE (prev_frame);
if (!SCM_SYMBOLP (pname) && !SCM_STRINGP (pname) && SCM_FRAME_PROC_P (current_frame)
&& SCM_EQ_P (scm_procedure_p (SCM_FRAME_PROC (current_frame)), SCM_BOOL_T))
pname = scm_procedure_name (SCM_FRAME_PROC (current_frame));
}
if (SCM_SYMBOLP (pname) || SCM_STRINGP (pname) || SCM_MEMOIZEDP (source))
{
display_header (source, a->port);
display_expression (current_frame, pname, source, a->port);
}
display_header (source, a->port);
scm_display_error_message (a->message, a->args, a->port);
return SCM_UNSPECIFIED;
}
struct display_error_handler_data {
char *mode;
SCM port;
};
/* This is the exception handler for error reporting routines.
Note that it is very important that this handler *doesn't* try to
print more than the error tag, since the error very probably is
caused by an erroneous print call-back routine. If we would
try to print all objects, we would enter an infinite loop. */
static SCM
display_error_handler (struct display_error_handler_data *data,
SCM tag, SCM args SCM_UNUSED)
{
SCM print_state = scm_make_print_state ();
scm_puts ("\nException during displaying of ", data->port);
scm_puts (data->mode, data->port);
scm_puts (": ", data->port);
scm_iprin1 (tag, data->port, SCM_PRINT_STATE (print_state));
scm_putc ('\n', data->port);
return SCM_UNSPECIFIED;
}
/* The function scm_i_display_error prints out a detailed error message. This
* function will be called directly within libguile to signal error messages.
* No parameter checks will be performed by scm_i_display_error. Thus, User
* code should rather use the function scm_display_error.
*/
void
scm_i_display_error (SCM stack, SCM port, SCM subr, SCM message, SCM args, SCM rest)
{
struct display_error_args a;
struct display_error_handler_data data;
a.stack = stack;
a.port = port;
a.subr = subr;
a.message = message;
a.args = args;
a.rest = rest;
data.mode = "error";
data.port = port;
scm_internal_catch (SCM_BOOL_T,
(scm_t_catch_body) display_error_body, &a,
(scm_t_catch_handler) display_error_handler, &data);
}
SCM_DEFINE (scm_display_error, "display-error", 6, 0, 0,
(SCM stack, SCM port, SCM subr, SCM message, SCM args, SCM rest),
"Display an error message to the output port @var{port}.\n"
"@var{stack} is the saved stack for the error, @var{subr} is\n"
"the name of the procedure in which the error occurred and\n"
"@var{message} is the actual error message, which may contain\n"
"formatting instructions. These will format the arguments in\n"
"the list @var{args} accordingly. @var{rest} is currently\n"
"ignored.")
#define FUNC_NAME s_scm_display_error
{
SCM_VALIDATE_OUTPUT_PORT (2, port);
scm_i_display_error (stack, port, subr, message, args, rest);
return SCM_UNSPECIFIED;
}
#undef FUNC_NAME
typedef struct {
int level;
int length;
} print_params_t;
static int n_print_params = 9;
static print_params_t default_print_params[] = {
{ 4, 9 }, { 4, 3 },
{ 3, 4 }, { 3, 3 },
{ 2, 4 }, { 2, 3 },
{ 1, 4 }, { 1, 3 }, { 1, 2 }
};
static print_params_t *print_params = default_print_params;
#ifdef GUILE_DEBUG
SCM_DEFINE (scm_set_print_params_x, "set-print-params!", 1, 0, 0,
(SCM params),
"Set the print parameters to the values from @var{params}.\n"
"@var{params} must be a list of two-element lists which must\n"
"hold two integer values.")
#define FUNC_NAME s_scm_set_print_params_x
{
int i;
int n;
SCM ls;
print_params_t *new_params;
SCM_VALIDATE_NONEMPTYLIST_COPYLEN (2, params, n);
for (ls = params; !SCM_NULLP (ls); ls = SCM_CDR (ls))
SCM_ASSERT (scm_ilength (SCM_CAR (params)) == 2
&& SCM_INUMP (SCM_CAAR (ls))
&& SCM_INUM (SCM_CAAR (ls)) >= 0
&& SCM_INUMP (SCM_CADAR (ls))
&& SCM_INUM (SCM_CADAR (ls)) >= 0,
params,
SCM_ARG2,
s_scm_set_print_params_x);
new_params = scm_must_malloc (n * sizeof (print_params_t),
FUNC_NAME);
if (print_params != default_print_params)
scm_must_free (print_params);
print_params = new_params;
for (i = 0; i < n; ++i)
{
print_params[i].level = SCM_INUM (SCM_CAAR (params));
print_params[i].length = SCM_INUM (SCM_CADAR (params));
params = SCM_CDR (params);
}
n_print_params = n;
return SCM_UNSPECIFIED;
}
#undef FUNC_NAME
#endif
static void
indent (int n, SCM port)
{
int i;
for (i = 0; i < n; ++i)
scm_putc (' ', port);
}
static void
display_frame_expr (char *hdr,SCM exp,char *tlr,int indentation,SCM sport,SCM port,scm_print_state *pstate)
{
SCM string;
int i = 0, n;
scm_t_ptob_descriptor *ptob = scm_ptobs + SCM_PTOBNUM (sport);
do
{
pstate->length = print_params[i].length;
ptob->seek (sport, 0, SEEK_SET);
if (SCM_CONSP (exp))
{
pstate->level = print_params[i].level - 1;
scm_iprlist (hdr, exp, tlr[0], sport, pstate);
scm_puts (&tlr[1], sport);
}
else
{
pstate->level = print_params[i].level;
scm_iprin1 (exp, sport, pstate);
}
ptob->flush (sport);
n = ptob->seek (sport, 0, SEEK_CUR);
++i;
}
while (indentation + n > SCM_BACKTRACE_WIDTH && i < n_print_params);
ptob->truncate (sport, n);
string = scm_strport_to_string (sport);
/* Remove control characters */
for (i = 0; i < n; ++i)
if (iscntrl (SCM_STRING_CHARS (string)[i]))
SCM_STRING_CHARS (string)[i] = ' ';
/* Truncate */
if (indentation + n > SCM_BACKTRACE_WIDTH)
{
n = SCM_BACKTRACE_WIDTH - indentation;
SCM_STRING_CHARS (string)[n - 1] = '$';
}
scm_lfwrite (SCM_STRING_CHARS (string), n, port);
}
static void
display_application (SCM frame,int indentation,SCM sport,SCM port,scm_print_state *pstate)
{
SCM proc = SCM_FRAME_PROC (frame);
SCM name = (!SCM_FALSEP (scm_procedure_p (proc))
? scm_procedure_name (proc)
: SCM_BOOL_F);
display_frame_expr ("[",
scm_cons (!SCM_FALSEP (name) ? name : proc,
SCM_FRAME_ARGS (frame)),
SCM_FRAME_EVAL_ARGS_P (frame) ? " ..." : "]",
indentation,
sport,
port,
pstate);
}
SCM_DEFINE (scm_display_application, "display-application", 1, 2, 0,
(SCM frame, SCM port, SCM indent),
"Display a procedure application @var{frame} to the output port\n"
"@var{port}. @var{indent} specifies the indentation of the\n"
"output.")
#define FUNC_NAME s_scm_display_application
{
SCM_VALIDATE_FRAME (1,frame);
if (SCM_UNBNDP (port))
port = scm_cur_outp;
else
SCM_VALIDATE_OPOUTPORT (2,port);
if (SCM_UNBNDP (indent))
indent = SCM_INUM0;
else
SCM_VALIDATE_INUM (3,indent);
if (SCM_FRAME_PROC_P (frame))
/* Display an application. */
{
SCM sport, print_state;
scm_print_state *pstate;
/* Create a string port used for adaptation of printing parameters. */
sport = scm_mkstrport (SCM_INUM0,
scm_make_string (SCM_MAKINUM (240),
SCM_UNDEFINED),
SCM_OPN | SCM_WRTNG,
FUNC_NAME);
/* Create a print state for printing of frames. */
print_state = scm_make_print_state ();
pstate = SCM_PRINT_STATE (print_state);
pstate->writingp = 1;
pstate->fancyp = 1;
display_application (frame, SCM_INUM (indent), sport, port, pstate);
return SCM_BOOL_T;
}
else
return SCM_BOOL_F;
}
#undef FUNC_NAME
SCM_SYMBOL (sym_base, "base");
static void
display_backtrace_get_file_line (SCM frame, SCM *file, SCM *line)
{
SCM source = SCM_FRAME_SOURCE (frame);
*file = SCM_MEMOIZEDP (source) ? scm_source_property (source, scm_sym_filename) : SCM_BOOL_F;
*line = (SCM_MEMOIZEDP (source)) ? scm_source_property (source, scm_sym_line) : SCM_BOOL_F;
}
static void
display_backtrace_file (frame, last_file, port, pstate)
SCM frame;
SCM *last_file;
SCM port;
scm_print_state *pstate;
{
SCM file, line;
display_backtrace_get_file_line (frame, &file, &line);
if (file == *last_file)
return;
*last_file = file;
scm_puts ("In ", port);
if (SCM_FALSEP (file))
if (SCM_FALSEP (line))
scm_puts ("unknown file", port);
else
scm_puts ("current input", port);
else
{
pstate->writingp = 0;
scm_iprin1 (file, port, pstate);
pstate->writingp = 1;
}
scm_puts (":\n", port);
}
static void
display_backtrace_file_and_line (SCM frame, SCM port, scm_print_state *pstate)
{
SCM file, line;
display_backtrace_get_file_line (frame, &file, &line);
if (SCM_EQ_P (SCM_SHOW_FILE_NAME, sym_base))
{
if (file == SCM_BOOL_F)
{
if (line == SCM_BOOL_F)
scm_putc ('?', port);
else
scm_puts ("<stdin>", port);
}
else
{
pstate -> writingp = 0;
#ifdef HAVE_POSIX
scm_iprin1 (SCM_STRINGP (file) ? scm_basename (file, SCM_UNDEFINED) : file,
port, pstate);
#else
scm_iprin1 (file, port, pstate);
#endif
pstate -> writingp = 1;
}
scm_putc (':', port);
}
else if (line != SCM_BOOL_F)
{
int i, j=0;
for (i = SCM_INUM (line)+1; i > 0; i = i/10, j++)
;
indent (4-j, port);
}
if (line == SCM_BOOL_F)
scm_puts (" ?", port);
else
scm_intprint (SCM_INUM (line) + 1, 10, port);
scm_puts (": ", port);
}
static void
display_frame (SCM frame,int nfield,int indentation,SCM sport,SCM port,scm_print_state *pstate)
{
int n, i, j;
/* Announce missing frames? */
if (!SCM_BACKWARDS_P && SCM_FRAME_OVERFLOW_P (frame))
{
indent (nfield + 1 + indentation, port);
scm_puts ("...\n", port);
}
/* display file name and line number */
if (!SCM_FALSEP (SCM_SHOW_FILE_NAME))
display_backtrace_file_and_line (frame, port, pstate);
/* Check size of frame number. */
n = SCM_FRAME_NUMBER (frame);
for (i = 0, j = n; j > 0; ++i) j /= 10;
/* Number indentation. */
indent (nfield - (i ? i : 1), port);
/* Frame number. */
scm_iprin1 (SCM_MAKINUM (n), port, pstate);
/* Real frame marker */
scm_putc (SCM_FRAME_REAL_P (frame) ? '*' : ' ', port);
/* Indentation. */
indent (indentation, port);
if (SCM_FRAME_PROC_P (frame))
/* Display an application. */
display_application (frame, nfield + 1 + indentation, sport, port, pstate);
else
/* Display a special form. */
{
SCM source = SCM_FRAME_SOURCE (frame);
SCM copy = (SCM_CONSP (source)
? scm_source_property (source, scm_sym_copy)
: SCM_BOOL_F);
SCM umcopy = (SCM_MEMOIZEDP (source)
? scm_unmemoize (source)
: SCM_BOOL_F);
display_frame_expr ("(",
SCM_CONSP (copy) ? copy : umcopy,
")",
nfield + 1 + indentation,
sport,
port,
pstate);
}
scm_putc ('\n', port);
/* Announce missing frames? */
if (SCM_BACKWARDS_P && SCM_FRAME_OVERFLOW_P (frame))
{
indent (nfield + 1 + indentation, port);
scm_puts ("...\n", port);
}
}
struct display_backtrace_args {
SCM stack;
SCM port;
SCM first;
SCM depth;
};
static SCM
display_backtrace_body (struct display_backtrace_args *a)
#define FUNC_NAME "display_backtrace_body"
{
int n_frames, beg, end, n, i, j;
int nfield, indent_p, indentation;
SCM frame, sport, print_state;
SCM last_file;
scm_print_state *pstate;
a->port = SCM_COERCE_OUTPORT (a->port);
/* Argument checking and extraction. */
SCM_VALIDATE_STACK (1, a->stack);
SCM_VALIDATE_OPOUTPORT (2, a->port);
n_frames = SCM_INUM (scm_stack_length (a->stack));
n = SCM_INUMP (a->depth) ? SCM_INUM (a->depth) : SCM_BACKTRACE_DEPTH;
if (SCM_BACKWARDS_P)
{
beg = SCM_INUMP (a->first) ? SCM_INUM (a->first) : 0;
end = beg + n - 1;
if (end >= n_frames)
end = n_frames - 1;
n = end - beg + 1;
}
else
{
if (SCM_INUMP (a->first))
{
beg = SCM_INUM (a->first);
end = beg - n + 1;
if (end < 0)
end = 0;
}
else
{
beg = n - 1;
end = 0;
if (beg >= n_frames)
beg = n_frames - 1;
}
n = beg - end + 1;
}
SCM_ASSERT (beg >= 0 && beg < n_frames, a->first, SCM_ARG3, s_display_backtrace);
SCM_ASSERT (n > 0, a->depth, SCM_ARG4, s_display_backtrace);
/* Create a string port used for adaptation of printing parameters. */
sport = scm_mkstrport (SCM_INUM0,
scm_make_string (SCM_MAKINUM (240), SCM_UNDEFINED),
SCM_OPN | SCM_WRTNG,
FUNC_NAME);
/* Create a print state for printing of frames. */
print_state = scm_make_print_state ();
pstate = SCM_PRINT_STATE (print_state);
pstate->writingp = 1;
pstate->fancyp = 1;
/* First find out if it's reasonable to do indentation. */
if (SCM_BACKWARDS_P)
indent_p = 0;
else
{
unsigned int j;
indent_p = 1;
frame = scm_stack_ref (a->stack, SCM_MAKINUM (beg));
for (i = 0, j = 0; i < n; ++i)
{
if (SCM_FRAME_REAL_P (frame))
++j;
if (j > SCM_BACKTRACE_INDENT)
{
indent_p = 0;
break;
}
frame = (SCM_BACKWARDS_P
? SCM_FRAME_PREV (frame)
: SCM_FRAME_NEXT (frame));
}
}
/* Determine size of frame number field. */
j = SCM_FRAME_NUMBER (scm_stack_ref (a->stack, SCM_MAKINUM (end)));
for (i = 0; j > 0; ++i) j /= 10;
nfield = i ? i : 1;
/* Print frames. */
frame = scm_stack_ref (a->stack, SCM_MAKINUM (beg));
indentation = 1;
last_file = SCM_UNDEFINED;
for (i = 0; i < n; ++i)
{
if (!SCM_EQ_P (SCM_SHOW_FILE_NAME, sym_base))
display_backtrace_file (frame, &last_file, a->port, pstate);
display_frame (frame, nfield, indentation, sport, a->port, pstate);
if (indent_p && SCM_FRAME_EVAL_ARGS_P (frame))
++indentation;
frame = (SCM_BACKWARDS_P ?
SCM_FRAME_PREV (frame) : SCM_FRAME_NEXT (frame));
}
scm_remember_upto_here_1 (print_state);
return SCM_UNSPECIFIED;
}
#undef FUNC_NAME
SCM_DEFINE (scm_display_backtrace, "display-backtrace", 2, 2, 0,
(SCM stack, SCM port, SCM first, SCM depth),
"Display a backtrace to the output port @var{port}. @var{stack}\n"
"is the stack to take the backtrace from, @var{first} specifies\n"
"where in the stack to start and @var{depth} how much frames\n"
"to display. Both @var{first} and @var{depth} can be @code{#f},\n"
"which means that default values will be used.")
#define FUNC_NAME s_scm_display_backtrace
{
struct display_backtrace_args a;
struct display_error_handler_data data;
a.stack = stack;
a.port = port;
a.first = first;
a.depth = depth;
data.mode = "backtrace";
data.port = port;
scm_internal_catch (SCM_BOOL_T,
(scm_t_catch_body) display_backtrace_body, &a,
(scm_t_catch_handler) display_error_handler, &data);
return SCM_UNSPECIFIED;
}
#undef FUNC_NAME
SCM_VARIABLE (scm_has_shown_backtrace_hint_p_var, "has-shown-backtrace-hint?");
SCM_DEFINE (scm_backtrace, "backtrace", 0, 0, 0,
(),
"Display a backtrace of the stack saved by the last error\n"
"to the current output port.")
#define FUNC_NAME s_scm_backtrace
{
SCM the_last_stack =
scm_fluid_ref (SCM_VARIABLE_REF (scm_the_last_stack_fluid_var));
if (!SCM_FALSEP (the_last_stack))
{
scm_newline (scm_cur_outp);
scm_puts ("Backtrace:\n", scm_cur_outp);
scm_display_backtrace (the_last_stack,
scm_cur_outp,
SCM_UNDEFINED,
SCM_UNDEFINED);
scm_newline (scm_cur_outp);
if (SCM_FALSEP (SCM_VARIABLE_REF (scm_has_shown_backtrace_hint_p_var))
&& !SCM_BACKTRACE_P)
{
scm_puts ("Type \"(debug-enable 'backtrace)\" if you would like "
"a backtrace\n"
"automatically if an error occurs in the future.\n",
scm_cur_outp);
SCM_VARIABLE_SET (scm_has_shown_backtrace_hint_p_var, SCM_BOOL_T);
}
}
else
{
scm_puts ("No backtrace available.\n", scm_cur_outp);
}
return SCM_UNSPECIFIED;
}
#undef FUNC_NAME
void
scm_init_backtrace ()
{
SCM f = scm_make_fluid ();
scm_the_last_stack_fluid_var = scm_c_define ("the-last-stack", f);
#include "libguile/backtrace.x"
}
/*
Local Variables:
c-file-style: "gnu"
End:
*/
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