pjs/xpcom/base/nsStackFrameUnix.cpp

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9.4 KiB
C++
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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is nsStackFrameWin.h code, released
* December 20, 2000.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 2003
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsStackFrameUnix.h"
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "nscore.h"
// On glibc 2.1, the Dl_info api defined in <dlfcn.h> is only exposed
// if __USE_GNU is defined. I suppose its some kind of standards
// adherence thing.
//
#if (__GLIBC_MINOR__ >= 1) && !defined(__USE_GNU)
#define __USE_GNU
#endif
#ifdef HAVE_LIBDL
#include <dlfcn.h>
#endif
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// This thing is exported by libstdc++
// Yes, this is a gcc only hack
#if defined(MOZ_DEMANGLE_SYMBOLS)
#include <cxxabi.h>
#include <stdlib.h> // for free()
#endif // MOZ_DEMANGLE_SYMBOLS
void DemangleSymbol(const char * aSymbol,
char * aBuffer,
int aBufLen)
{
aBuffer[0] = '\0';
#if defined(MOZ_DEMANGLE_SYMBOLS)
/* See demangle.h in the gcc source for the voodoo */
char * demangled = abi::__cxa_demangle(aSymbol,0,0,0);
if (demangled)
{
strncpy(aBuffer,demangled,aBufLen);
free(demangled);
}
#endif // MOZ_DEMANGLE_SYMBOLS
}
#if defined(linux) && defined(__GNUC__) && (defined(__i386) || defined(PPC) || defined(__x86_64__)) // i386 or PPC Linux stackwalking code
void DumpStackToFile(FILE* aStream)
{
// Stack walking code courtesy Kipp's "leaky".
// Get the frame pointer
void **bp;
#if defined(__i386)
__asm__( "movl %%ebp, %0" : "=g"(bp));
#elif defined(__x86_64__)
__asm__( "movq %%rbp, %0" : "=g"(bp));
#else
// It would be nice if this worked uniformly, but at least on i386 and
// x86_64, it stopped working with gcc 4.1, because it points to the
// end of the saved registers instead of the start.
bp = (void**) __builtin_frame_address(0);
#endif
int skip = 2;
for ( ; (void**)*bp > bp; bp = (void**)*bp) {
void *pc = *(bp+1);
if (--skip <= 0) {
Dl_info info;
int ok = dladdr(pc, &info);
if (!ok) {
fprintf(aStream, "UNKNOWN %p\n", pc);
continue;
}
PRUint32 foff = (char*)pc - (char*)info.dli_fbase;
const char * symbol = info.dli_sname;
int len;
if (!symbol || !(len = strlen(symbol))) {
fprintf(aStream, "UNKNOWN [%s +0x%08X]\n",
info.dli_fname, foff);
continue;
}
char demangled[4096] = "\0";
DemangleSymbol(symbol, demangled, sizeof(demangled));
if (strlen(demangled)) {
symbol = demangled;
len = strlen(symbol);
}
PRUint32 off = (char*)pc - (char*)info.dli_saddr;
fprintf(aStream, "%s+0x%08X [%s +0x%08X]\n",
symbol, off, info.dli_fname, foff);
}
}
}
#elif defined(__sun) && (defined(__sparc) || defined(sparc) || defined(__i386) || defined(i386))
/*
* Stack walking code for Solaris courtesy of Bart Smaalder's "memtrak".
*/
#include <synch.h>
#include <ucontext.h>
#include <sys/frame.h>
#include <sys/regset.h>
#include <sys/stack.h>
static int load_address ( void * pc, void * arg, FILE * aStream );
static int write_address_file ( void * pc );
static struct bucket * newbucket ( void * pc );
static struct frame * cs_getmyframeptr ( void );
static void cs_walk_stack ( void * (*read_func)(char * address),
struct frame * fp,
int (*operate_func)(void *, void *),
void * usrarg, FILE * aStream );
static void cs_operate ( void (*operate_func)(void *, void *),
void * usrarg, FILE * aStream );
#ifndef STACK_BIAS
#define STACK_BIAS 0
#endif /*STACK_BIAS*/
#define LOGSIZE 4096
/* type of demangling function */
typedef int demf_t(const char *, char *, size_t);
static demf_t *demf;
static int initialized = 0;
#if defined(sparc) || defined(__sparc)
#define FRAME_PTR_REGISTER REG_SP
#endif
#if defined(i386) || defined(__i386)
#define FRAME_PTR_REGISTER EBP
#endif
struct bucket {
void * pc;
int index;
struct bucket * next;
};
struct mybuf {
char * buffer;
int chars_left;
};
static void myinit();
#pragma init (myinit)
static void
myinit()
{
if (! initialized) {
#ifndef __GNUC__
void *handle;
const char *libdem = "libdemangle.so.1";
/* load libdemangle if we can and need to (only try this once) */
if ((handle = dlopen(libdem, RTLD_LAZY)) != NULL) {
demf = (demf_t *)dlsym(handle,
"cplus_demangle"); /*lint !e611 */
/*
* lint override above is to prevent lint from
* complaining about "suspicious cast".
*/
}
#endif /*__GNUC__*/
}
initialized = 1;
}
static int
write_address_file(void * pc, FILE* aStream)
{
static struct bucket table[2048];
static mutex_t lock;
struct bucket * ptr;
unsigned int val = NS_PTR_TO_INT32(pc);
ptr = table + ((val >> 2)&2047);
mutex_lock(&lock);
while (ptr->next) {
if (ptr->next->pc == pc)
break;
ptr = ptr->next;
}
if (ptr->next) {
mutex_unlock(&lock);
return (ptr->next->index);
} else {
char buffer[4096], dembuff[4096];
Dl_info info;
const char *func = "??", *lib = "??";
ptr->next = newbucket(pc);
mutex_unlock(&lock);
if (dladdr(pc, & info)) {
if (info.dli_fname)
lib = info.dli_fname;
if (info.dli_sname)
func = info.dli_sname;
}
#ifdef __GNUC__
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DemangleSymbol(func, dembuff, sizeof(dembuff));
#else
if (!demf || demf(func, dembuff, sizeof (dembuff)))
dembuff[0] = 0;
#endif /*__GNUC__*/
if (strlen(dembuff)) {
func = dembuff;
}
fprintf(aStream, "%u %s:%s+0x%x\n",
ptr->next->index,
lib,
func,
(char *)pc - (char*)info.dli_saddr);
return (ptr->next->index);
}
}
static int
load_address(void * pc, void * arg, FILE * aStream)
{
struct mybuf * buf = (struct mybuf *) arg;
char name[80];
int len;
sprintf(name, " %u", write_address_file(pc, aStream));
len = strlen(name);
if (len >= buf->chars_left)
return (1);
strcat(buf->buffer, name);
buf->chars_left -= len;
return (0);
}
static struct bucket *
newbucket(void * pc)
{
struct bucket * ptr = (struct bucket *) malloc(sizeof (*ptr));
static int index; /* protected by lock in caller */
ptr->index = index++;
ptr->next = NULL;
ptr->pc = pc;
return (ptr);
}
static struct frame *
csgetframeptr()
{
ucontext_t u;
struct frame *fp;
(void) getcontext(&u);
fp = (struct frame *)
((char *)u.uc_mcontext.gregs[FRAME_PTR_REGISTER] +
STACK_BIAS);
/* make sure to return parents frame pointer.... */
return ((struct frame *)((ulong_t)fp->fr_savfp + STACK_BIAS));
}
static void
cswalkstack(struct frame *fp, int (*operate_func)(void *, void *, FILE *),
void *usrarg, FILE * aStream)
{
while (fp != 0 && fp->fr_savpc != 0) {
if (operate_func((void *)fp->fr_savpc, usrarg, aStream) != 0)
break;
/*
* watch out - libthread stacks look funny at the top
* so they may not have their STACK_BIAS set
*/
fp = (struct frame *)((ulong_t)fp->fr_savfp +
(fp->fr_savfp?(ulong_t)STACK_BIAS:0));
}
}
static void
cs_operate(int (*operate_func)(void *, void *, FILE *), void * usrarg, FILE *aStream)
{
cswalkstack(csgetframeptr(), operate_func, usrarg, aStream);
}
void DumpStackToFile(FILE* aStream)
{
char buffer[LOGSIZE];
struct mybuf mybuf;
if (!initialized)
myinit();
mybuf.chars_left = LOGSIZE - strlen(buffer)-1;
mybuf.buffer = buffer;
cs_operate(load_address, &mybuf, aStream);
}
#endif