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/*
* Debugging utilities.
* Copyright (c) 1998 New Generation Software (NGS) Oy
*
* Author: Markku Rossi <mtr@ngs.fi>
*/
/*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
* MA 02111-1307, USA
*/
/*
* $Source: /home/cvs/entity/libentitynjs/debug.c,v $
* $Id: debug.c,v 1.4 2000/07/25 05:25:59 imain Exp $
*/
#include "njs/internal.h"
/*
* Global functions.
*/
#define STRING_MAX_PRINT_LEN 10
void
js_vm_stacktrace (JSVirtualMachine *vm, unsigned int num_frames)
{
unsigned int frame = 0;
JSNode *sp = vm->sp;
void *pc = vm->pc;
JSNode *fp;
char buf[512];
js_snprintf (buf, sizeof (buf), "VM: stacktrace: stacksize=%d, used=%d%s",
vm->stack_size,
(vm->stack + vm->stack_size - sp),
JS_HOST_LINE_BREAK);
js_iostream_write (vm->s_stderr, buf, strlen (buf));
/* STACKFRAME */
/* Find frame pointer. */
for (fp = sp + 1; fp->type != JS_IPTR; fp++)
;
/* The first iptr is the return address. */
fp++;
/* The second iptr is the with pointer. */
fp++;
/* The third item is a JS_ARGS_FIX node. */
assert (fp->type == JS_ARGS_FIX);
fp++;
while (fp && frame < num_frames)
{
JSNode *n;
const char *func_name = js_vm_func_name (vm, pc);
js_snprintf (buf, sizeof (buf), "#%-3u %s%s:", frame++, func_name,
func_name[0] == '.' ? "" : "()");
js_iostream_write (vm->s_stderr, buf, strlen (buf));
if (vm->verbose_stacktrace)
{
js_snprintf (buf, sizeof (buf),
" ra=0x%lx, wp=0x%lx, af=%d:%d, ofp=0x%lx",
(unsigned long) (fp - 3)->u.iptr,
(unsigned long) JS_WITHPTR->u.iptr,
JS_ARGS_FIXP->u.args_fix.argc,
JS_ARGS_FIXP->u.args_fix.delta,
(unsigned long) fp->u.iptr);
js_iostream_write (vm->s_stderr, buf, strlen (buf));
}
for (n = sp + 1; n != fp - 3; n++)
{
switch (n->type)
{
case JS_UNDEFINED:
js_snprintf (buf, sizeof (buf), " undefined");
break;
case JS_NULL:
js_snprintf (buf, sizeof (buf), " null");
break;
case JS_BOOLEAN:
js_snprintf (buf, sizeof (buf), " %s", n->u.vboolean ? "true" : "false");
break;
case JS_INTEGER:
js_snprintf (buf, sizeof (buf), " %ld", n->u.vinteger);
break;
case JS_STRING:
if (n->u.vstring->len > STRING_MAX_PRINT_LEN)
js_snprintf (buf, sizeof (buf), " \"%.*s...\"",
STRING_MAX_PRINT_LEN,
n->u.vstring->data);
else
js_snprintf (buf, sizeof (buf), " \"%.*s\"",
(int) n->u.vstring->len,
n->u.vstring->data);
break;
case JS_FLOAT:
js_snprintf (buf, sizeof (buf), " %g", n->u.vfloat);
break;
case JS_ARRAY:
js_snprintf (buf, sizeof (buf), " array");
break;
case JS_OBJECT:
js_snprintf (buf, sizeof (buf), " object");
break;
case JS_SYMBOL:
js_snprintf (buf, sizeof (buf), " %s", js_vm_symname (vm, n->u.vsymbol));
break;
case JS_BUILTIN:
js_snprintf (buf, sizeof (buf), " builtin");
break;
case JS_FUNC:
js_snprintf (buf, sizeof (buf), " function");
break;
case JS_IPTR:
js_snprintf (buf, sizeof (buf), " 0x%lx", (unsigned long) n->u.iptr);
break;
case JS_ARGS_FIX:
js_snprintf (buf, sizeof (buf), " <num=%d, delta=%d>", n->u.args_fix.argc,
n->u.args_fix.delta);
break;
default:
js_snprintf (buf, sizeof (buf), " type=%d???", n->type);
break;
}
js_iostream_write (vm->s_stderr, buf, strlen (buf));
}
js_iostream_write (vm->s_stderr, JS_HOST_LINE_BREAK,
JS_HOST_LINE_BREAK_LEN);
/* Move to the caller. */
sp = fp;
pc = fp[-3].u.iptr;
fp = fp->u.iptr;
}
}
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