--- /dev/null
+/* Printing of backtraces and error messages
+ * Copyright (C) 1996,1997,1998,1999,2000,2001, 2003, 2004, 2006 Free Software Foundation
+ *
+ * This library 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 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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 this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <stdio.h>
+#include <ctype.h>
+#include <assert.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/dynwind.h"
+
+#include "libguile/validate.h"
+#include "libguile/lang.h"
+#include "libguile/backtrace.h"
+#include "libguile/filesys.h"
+
+/* {Error reporting and backtraces}
+ *
+ * Note that these functions shouldn't generate errors themselves.
+ */
+
+/* Print parameters for error messages. */
+
+#define DISPLAY_ERROR_MESSAGE_MAX_LEVEL 7
+#define DISPLAY_ERROR_MESSAGE_MAX_LENGTH 10
+
+/* Print parameters for failing expressions in error messages.
+ * (See also `print_params' below for backtrace print parameters.)
+ */
+
+#define DISPLAY_EXPRESSION_MAX_LEVEL 2
+#define DISPLAY_EXPRESSION_MAX_LENGTH 3
+
+#undef SCM_ASSERT
+#define SCM_ASSERT(_cond, _arg, _pos, _subr) \
+ if (!(_cond)) \
+ return SCM_BOOL_F;
+
+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_is_true (fname))
+ scm_prin1 (fname, port, 0);
+ else
+ scm_puts ("<unnamed port>", port);
+
+ if (scm_is_true (line) && scm_is_true (col))
+ {
+ scm_putc (':', port);
+ scm_intprint (scm_to_long (line) + 1, 10, port);
+ scm_putc (':', port);
+ scm_intprint (scm_to_long (col) + 1, 10, port);
+ }
+ }
+ else
+ scm_puts ("ERROR", port);
+ scm_puts (": ", port);
+}
+
+
+struct display_error_message_data {
+ SCM message;
+ SCM args;
+ SCM port;
+ scm_print_state *pstate;
+ int old_fancyp;
+ int old_level;
+ int old_length;
+};
+
+static SCM
+display_error_message (struct display_error_message_data *d)
+{
+ if (scm_is_string (d->message) && scm_is_true (scm_list_p (d->args)))
+ scm_simple_format (d->port, d->message, d->args);
+ else
+ scm_display (d->message, d->port);
+ scm_newline (d->port);
+ return SCM_UNSPECIFIED;
+}
+
+static void
+before_display_error_message (struct display_error_message_data *d)
+{
+ scm_print_state *pstate = d->pstate;
+ d->old_fancyp = pstate->fancyp;
+ d->old_level = pstate->level;
+ d->old_length = pstate->length;
+ pstate->fancyp = 1;
+ pstate->level = DISPLAY_ERROR_MESSAGE_MAX_LEVEL;
+ pstate->length = DISPLAY_ERROR_MESSAGE_MAX_LENGTH;
+}
+
+static void
+after_display_error_message (struct display_error_message_data *d)
+{
+ scm_print_state *pstate = d->pstate;
+ pstate->fancyp = d->old_fancyp;
+ pstate->level = d->old_level;
+ pstate->length = d->old_length;
+}
+
+void
+scm_display_error_message (SCM message, SCM args, SCM port)
+{
+ struct display_error_message_data d;
+ SCM print_state;
+ scm_print_state *pstate;
+
+ port = scm_i_port_with_print_state (port, SCM_UNDEFINED);
+ print_state = SCM_PORT_WITH_PS_PS (port);
+ pstate = SCM_PRINT_STATE (print_state);
+
+ d.message = message;
+ d.args = args;
+ d.port = port;
+ d.pstate = pstate;
+ scm_internal_dynamic_wind ((scm_t_guard) before_display_error_message,
+ (scm_t_inner) display_error_message,
+ (scm_t_guard) after_display_error_message,
+ &d,
+ &d);
+}
+
+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 = DISPLAY_EXPRESSION_MAX_LEVEL;
+ pstate->length = DISPLAY_EXPRESSION_MAX_LENGTH;
+ if (scm_is_symbol (pname) || scm_is_string (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_i_unmemoize_expr (source), port, pstate);
+ }
+ }
+ else if (SCM_MEMOIZEDP (source))
+ {
+ scm_puts ("In expression ", port);
+ pstate->writingp = 1;
+ scm_iprin1 (scm_i_unmemoize_expr (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_debug_mode_p
+ && 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_is_true (prev_frame))
+ source = SCM_FRAME_SOURCE (prev_frame);
+ if (!scm_is_symbol (pname)
+ && !scm_is_string (pname)
+ && SCM_FRAME_PROC_P (current_frame)
+ && scm_is_true (scm_procedure_p (SCM_FRAME_PROC (current_frame))))
+ pname = scm_procedure_name (SCM_FRAME_PROC (current_frame));
+ }
+ if (scm_is_symbol (pname) || scm_is_string (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_NULL_OR_NIL_P (ls); ls = SCM_CDR (ls))
+ SCM_ASSERT (scm_ilength (SCM_CAR (params)) == 2
+ && scm_is_unsigned_integer (SCM_CAAR (ls), 0, INT_MAX)
+ && scm_is_unsigned_integer (SCM_CADAR (ls), 0, INT_MAX),
+ params,
+ SCM_ARG2,
+ s_scm_set_print_params_x);
+ new_params = scm_malloc (n * sizeof (print_params_t));
+ if (print_params != default_print_params)
+ free (print_params);
+ print_params = new_params;
+ for (i = 0; i < n; ++i)
+ {
+ print_params[i].level = scm_to_int (SCM_CAAR (params));
+ print_params[i].length = scm_to_int (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)
+{
+ 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_is_pair (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);
+
+ scm_display (scm_strport_to_string (sport), 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_is_true (scm_procedure_p (proc))
+ ? scm_procedure_name (proc)
+ : SCM_BOOL_F);
+ display_frame_expr ("[",
+ scm_cons (scm_is_true (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_current_output_port ();
+ else
+ SCM_VALIDATE_OPOUTPORT (2, port);
+ if (SCM_UNBNDP (indent))
+ indent = SCM_INUM0;
+
+ 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_from_int (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_to_int (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 (scm_is_eq (file, *last_file))
+ return;
+
+ *last_file = file;
+
+ scm_puts ("In ", port);
+ if (scm_is_false (file))
+ if (scm_is_false (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_is_eq (SCM_PACK (SCM_SHOW_FILE_NAME), sym_base))
+ {
+ if (scm_is_false (file))
+ {
+ if (scm_is_false (line))
+ scm_putc ('?', port);
+ else
+ scm_puts ("<stdin>", port);
+ }
+ else
+ {
+ pstate -> writingp = 0;
+#ifdef HAVE_POSIX
+ scm_iprin1 ((scm_is_string (file)?
+ scm_basename (file, SCM_UNDEFINED) : file),
+ port, pstate);
+#else
+ scm_iprin1 (file, port, pstate);
+#endif
+ pstate -> writingp = 1;
+ }
+
+ scm_putc (':', port);
+ }
+ else if (scm_is_true (line))
+ {
+ int i, j=0;
+ for (i = scm_to_int (line)+1; i > 0; i = i/10, j++)
+ ;
+ indent (4-j, port);
+ }
+
+ if (scm_is_false (line))
+ scm_puts (" ?", port);
+ else
+ scm_intprint (scm_to_int (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_is_true (SCM_PACK (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_from_int (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_is_pair (source)
+ ? scm_source_property (source, scm_sym_copy)
+ : SCM_BOOL_F);
+ SCM umcopy = (SCM_MEMOIZEDP (source)
+ ? scm_i_unmemoize_expr (source)
+ : SCM_BOOL_F);
+ display_frame_expr ("(",
+ scm_is_pair (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;
+ SCM highlight_objects;
+};
+
+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_to_int (scm_stack_length (a->stack));
+ n = scm_is_integer (a->depth) ? scm_to_int (a->depth) : SCM_BACKTRACE_DEPTH;
+ if (SCM_BACKWARDS_P)
+ {
+ beg = scm_is_integer (a->first) ? scm_to_int (a->first) : 0;
+ end = beg + n - 1;
+ if (end >= n_frames)
+ end = n_frames - 1;
+ n = end - beg + 1;
+ }
+ else
+ {
+ if (scm_is_integer (a->first))
+ {
+ beg = scm_to_int (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_from_int (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;
+ pstate->highlight_objects = a->highlight_objects;
+
+ /* 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_from_int (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_from_int (end)));
+ for (i = 0; j > 0; ++i) j /= 10;
+ nfield = i ? i : 1;
+
+ /* Print frames. */
+ frame = scm_stack_ref (a->stack, scm_from_int (beg));
+ indentation = 1;
+ last_file = SCM_UNDEFINED;
+ for (i = 0; i < n; ++i)
+ {
+ if (!scm_is_eq (SCM_PACK (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_with_highlights, "display-backtrace", 2, 3, 0,
+ (SCM stack, SCM port, SCM first, SCM depth, SCM highlights),
+ "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.\n"
+ "When @var{highlights} is given,\n"
+ "it should be a list and all members of it are highligthed in\n"
+ "the backtrace.")
+#define FUNC_NAME s_scm_display_backtrace_with_highlights
+{
+ struct display_backtrace_args a;
+ struct display_error_handler_data data;
+ a.stack = stack;
+ a.port = port;
+ a.first = first;
+ a.depth = depth;
+ if (SCM_UNBNDP (highlights))
+ a.highlight_objects = SCM_EOL;
+ else
+ a.highlight_objects = highlights;
+ 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
+scm_display_backtrace (SCM stack, SCM port, SCM first, SCM depth)
+{
+ return scm_display_backtrace_with_highlights (stack, port, first, depth,
+ SCM_EOL);
+}
+
+SCM_VARIABLE (scm_has_shown_backtrace_hint_p_var, "has-shown-backtrace-hint?");
+
+SCM_DEFINE (scm_backtrace_with_highlights, "backtrace", 0, 1, 0,
+ (SCM highlights),
+ "Display a backtrace of the stack saved by the last error\n"
+ "to the current output port. When @var{highlights} is given,\n"
+ "it should be a list and all members of it are highligthed in\n"
+ "the backtrace.")
+#define FUNC_NAME s_scm_backtrace_with_highlights
+{
+ SCM port = scm_current_output_port ();
+ SCM the_last_stack =
+ scm_fluid_ref (SCM_VARIABLE_REF (scm_the_last_stack_fluid_var));
+
+ if (SCM_UNBNDP (highlights))
+ highlights = SCM_EOL;
+
+ if (scm_is_true (the_last_stack))
+ {
+ scm_newline (port);
+ scm_puts ("Backtrace:\n", port);
+ scm_display_backtrace_with_highlights (the_last_stack,
+ port,
+ SCM_BOOL_F,
+ SCM_BOOL_F,
+ highlights);
+ scm_newline (port);
+ if (scm_is_false (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",
+ port);
+ SCM_VARIABLE_SET (scm_has_shown_backtrace_hint_p_var, SCM_BOOL_T);
+ }
+ }
+ else
+ {
+ scm_puts ("No backtrace available.\n", port);
+ }
+ return SCM_UNSPECIFIED;
+}
+#undef FUNC_NAME
+
+SCM
+scm_backtrace (void)
+{
+ return scm_backtrace_with_highlights (SCM_EOL);
+}
+
+\f
+
+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:
+*/
projects / lilypond.git / blobdiff