gecko-dev/tools/leaky/libmalloc.cpp

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/* ***** 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 mozilla.org code.
*
* The Initial Developer of the Original Code is
* Kipp E.B. Hickman.
* Portions created by the Initial Developer are Copyright (C) 1999
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either 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 ***** */
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#include "libmalloc.h"
#include <memory.h>
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <setjmp.h>
#include <dlfcn.h>
#ifdef NTO
#include <sys/link.h>
extern r_debug _r_debug;
#else
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#include <link.h>
#endif
#ifdef NTO
#define JB_BP 0x08
#include <setjmp.h>
#endif
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extern "C" {
#ifdef NEED_WRAPPERS
void* __wrap_malloc(size_t);
void* __wrap_realloc(void*, size_t);
void __wrap_free(void*);
void* __wrap___builtin_new(size_t);
void __wrap___builtin_delete(void*);
void* __wrap___builtin_vec_new(size_t);
void __wrap___builtin_vec_delete(void*);
void* __wrap_PR_Malloc(size_t);
void* __wrap_PR_Calloc(size_t, size_t);
void* __wrap_PR_Realloc(void*, size_t);
void __wrap_PR_Free(void*);
#endif
}
static int gLogFD = -1;
static u_long gFlags;
static int gFillCount = 0;
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#define MARKER0 0xFFFFFFFF
#define MARKER1 0xEEEEEEEE
#define MARKER2_0 0xD8D8D8D8
#define MARKER2_1 0xE8E8E8E8
#define PATTERN_BYTE 0xFE
#define FREE_PATTERN_BYTE 0xDE
struct Header {
u_long marker0;
size_t rawSize; // user requested size
size_t size; // size rounded up
u_long marker1;
};
struct Trailer {
u_long marker2[2];
};
//----------------------------------------------------------------------
#if defined(i386)
static void CrawlStack(malloc_log_entry* me, jmp_buf jb)
{
#ifdef NTO
u_long* bp = (u_long*) (jb[0].__savearea[JB_BP]);
#else
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u_long* bp = (u_long*) (jb[0].__jmpbuf[JB_BP]);
#endif
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u_long numpcs = 0;
int skip = 2;
while (numpcs < MAX_STACK_CRAWL) {
u_long* nextbp = (u_long*) *bp++;
u_long pc = *bp;
if ((pc < 0x08000000) || (pc > 0x7fffffff) || (nextbp < bp)) {
break;
}
if (--skip < 0) {
me->pcs[numpcs++] = (char*) pc;
}
bp = nextbp;
}
me->numpcs = numpcs;
}
#endif
//----------------------------------------------------------------------
#if defined(linux) || defined(NTO)
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static void DumpAddressMap()
{
int mfd = open("malloc-map", O_CREAT|O_WRONLY|O_TRUNC, 0666);
if (mfd >= 0) {
malloc_map_entry mme;
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link_map* map = _r_debug.r_map;
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while (NULL != map) {
if (0 != map->l_addr) {
mme.nameLen = strlen(map->l_name);
mme.address = map->l_addr;
write(mfd, &mme, sizeof(mme));
write(mfd, map->l_name, mme.nameLen);
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#if 0
write(1, map->l_name, mme.nameLen);
write(1, "\n", 1);
#endif
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}
map = map->l_next;
}
close(mfd);
}
}
#endif
//----------------------------------------------------------------------
static int Verify(Header* h)
{
// Sanity check the header first
if ((h->marker0 != MARKER0) ||
(h->marker1 != MARKER1) ||
(h->rawSize > h->size)) {
DumpAddressMap();
abort();
}
// Sanity check the trailer second
Trailer* t = (Trailer*) ((char*)(h + 1) + h->size);
if ((t->marker2[0] != MARKER2_0) ||
(t->marker2[1] != MARKER2_1)) {
DumpAddressMap();
abort();
}
// Verify there were no overruns
size_t fill = h->size - h->rawSize;
if (0 != fill) {
unsigned char* cp = ((unsigned char*)(h + 1)) + h->rawSize;
unsigned char* end = cp + fill;
while (cp < end) {
unsigned char ch = *cp++;
if (ch != PATTERN_BYTE) {
DumpAddressMap();
abort();
}
}
}
return 1;
}
static void
Log(int aType, void* aAddr, size_t aSize, void* aOldAddr)
{
malloc_log_entry me;
me.type = (u_long) aType;
me.address = (u_long) aAddr;
me.size = (u_long) aSize;
me.oldaddress = (u_long) aOldAddr;
jmp_buf jb;
setjmp(jb);
CrawlStack(&me, jb);
write(gLogFD, &me, sizeof(me) - MAX_STACK_CRAWL*sizeof(char*) +
me.numpcs*sizeof(char*));
}
static void*
MallocHook(size_t aSize, u_long aLogType)
{
size_t roundedSize = aSize;
roundedSize = ((roundedSize + 4 + gFillCount) >> 2) << 2;
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void* ptr = REAL_MALLOC(sizeof(Header) + roundedSize + sizeof(Trailer));
if (NULL != ptr) {
Header* h = (Header*) ptr;
h->rawSize = aSize;
h->size = roundedSize;
h->marker0 = MARKER0;
h->marker1 = MARKER1;
ptr = (void*) ((char*)(h+1));
// Fill new memory with a pattern to help detect overruns and
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// usage of un-written memory
memset(ptr, PATTERN_BYTE, roundedSize);
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Trailer* t = (Trailer*) ((char*)ptr + roundedSize);
t->marker2[0] = MARKER2_0;
t->marker2[1] = MARKER2_1;
if (LIBMALLOC_LOG & gFlags) {
Log(aLogType, ptr, aSize, 0);
}
}
return ptr;
}
static void
FreeHook(void* aAddr, u_long aLogType)
{
if (0 == aAddr) {
return;
}
if (LIBMALLOC_LOG & gFlags) {
Log(aLogType, aAddr, 0, 0);
}
Header* h = (Header*) ((char*)aAddr - sizeof(Header));
if (Verify(h)) {
// Munge the header so that a dup-free will fail the verify
h->marker0 = 0xDEADBEEF;
h->marker1 = 0xDEADBEEF;
// Munge the body of the allocation so that if the user
// still has a live reference they get messed up
void* ptr = (void*) ((char*)(h+1));
memset(ptr, FREE_PATTERN_BYTE, h->rawSize);
if (0 == (LIBMALLOC_NOFREE & gFlags)) {
REAL_FREE(h);
}
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}
else {
if (0 == (LIBMALLOC_NOFREE & gFlags)) {
REAL_FREE(aAddr);
}
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}
}
static void*
ReallocHook(void* aOldAddr, size_t aSize)
{
if (0 == aOldAddr) {
return MallocHook(aSize, malloc_log_malloc);
}
Header* oldh = (Header*) ((char*)aOldAddr - sizeof(Header));
if (!Verify(oldh)) {
return REAL_REALLOC(aOldAddr, aSize);
}
size_t oldSize = oldh->rawSize;
size_t roundedSize = aSize;
roundedSize = ((roundedSize + 4) >> 2) << 2;
void* ptr = REAL_MALLOC(sizeof(Header) + roundedSize + sizeof(Trailer));
if (NULL != ptr) {
Header* h = (Header*) ptr;
h->rawSize = aSize;
h->size = roundedSize;
h->marker0 = MARKER0;
h->marker1 = MARKER1;
ptr = (void*) ((char*)(h+1));
Trailer* t = (Trailer*) ((char*)ptr + roundedSize);
t->marker2[0] = MARKER2_0;
t->marker2[1] = MARKER2_1;
// Copy old memory into new memory (don't copy too much!)
size_t copy = oldSize;
if (copy > aSize) copy = aSize;
memcpy(ptr, aOldAddr, copy);
// Fill any uncopied memory with the overrun pattern
size_t fill = roundedSize - copy;
if (0 != fill) {
memset((char*)ptr + copy, PATTERN_BYTE, fill);
}
if (0 == (LIBMALLOC_NOFREE & gFlags)) {
REAL_FREE(oldh);
}
else {
// Mark the old header so that a verify will fail if the caller
// dup free's it.
oldh->marker0 = 0xDEADBEEF;
oldh->marker1 = 0xDEADBEEF;
// Munge the body of the old allocation so that if the user
// still has a live reference they get messed up
void* optr = (void*) ((char*)(oldh+1));
memset(optr, FREE_PATTERN_BYTE, oldh->rawSize);
}
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if (LIBMALLOC_LOG & gFlags) {
Log(malloc_log_realloc, ptr, aSize, aOldAddr);
}
}
return ptr;
}
u_long
SetMallocFlags(u_long aFlags)
{
u_long old = gFlags;
gFlags = aFlags;
if ((-1 == gLogFD) && ((LIBMALLOC_LOG|LIBMALLOC_LOG_RC) & gFlags)) {
gLogFD = open("malloc-log", O_CREAT|O_WRONLY|O_TRUNC, 0666);
if (gLogFD < 0) {
gFlags &= ~LIBMALLOC_LOG;
printf("unable to create malloc-log: %d\n", errno);
}
}
if ((gLogFD >= 0) && (0 == ((LIBMALLOC_LOG|LIBMALLOC_LOG_RC) & gFlags))) {
close(gLogFD);
gLogFD = -1;
}
#ifndef NTO
if (LIBMALLOC_CHECK & gFlags) {
mallopt(M_CHECK_ACTION, 1);
}
#endif
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// Try to guarantee that the address map is always dumped
atexit(DumpAddressMap);
return old;
}
static int gFirstTime = 1;
static void Init()
{
gFirstTime = 0;
u_long flags = 0;
char* s = getenv("LIBMALLOC_LOG");
if (s) {
flags = atoi(s);
if (LIBMALLOC_LOG & flags) {
char m1[] = "dbgmalloc: enabled memory logging\n";
write(1, m1, sizeof(m1)-1);
}
if (LIBMALLOC_LOG_RC & flags) {
char m2[] = "dbgmalloc: enabled refcnt logging\n";
write(1, m2, sizeof(m2)-1);
}
if (LIBMALLOC_NOFREE & flags) {
char m3[] = "dbgmalloc: disabled free\n";
write(1, m3, sizeof(m3)-1);
}
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}
SetMallocFlags(flags);
s = getenv("LIBMALLOC_FILL");
if (s) {
gFillCount = atoi(s);
char m4[] = "dbgmalloc: adding extra memory fill ";
write(1, m4, sizeof(m4)-1);
write(1, s, strlen(s));
write(1, "\n", 1);
}
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}
//----------------------------------------------------------------------
#ifdef NEED_WRAPPERS
void* __wrap_malloc(size_t aSize)
{
if (gFirstTime) {
Init();
}
return MallocHook(aSize, malloc_log_malloc);
}
void* __wrap_realloc(void* aPtr, size_t aSize)
{
if (gFirstTime) {
Init();
}
return ReallocHook(aPtr, aSize);
}
void __wrap_free(void* aPtr)
{
if (gFirstTime) {
Init();
}
FreeHook(aPtr, malloc_log_free);
}
void* __wrap___builtin_new(size_t aSize)
{
if (gFirstTime) {
Init();
}
return MallocHook(aSize, malloc_log_new);
}
void __wrap___builtin_delete(void* aPtr)
{
if (gFirstTime) {
Init();
}
FreeHook(aPtr, malloc_log_delete);
}
void* __wrap___builtin_vec_new(size_t aSize)
{
if (gFirstTime) {
Init();
}
return MallocHook(aSize, malloc_log_new);
}
void __wrap___builtin_vec_delete(void* aPtr)
{
if (gFirstTime) {
Init();
}
FreeHook(aPtr, malloc_log_delete);
}
void* __wrap_PR_Malloc(size_t aSize)
{
if (gFirstTime) {
Init();
}
return MallocHook(aSize, malloc_log_malloc);
}
void* __wrap_PR_Calloc(size_t aSize, size_t aBsize)
{
if (gFirstTime) {
Init();
}
size_t size = aSize*aBsize;
void* ptr = MallocHook(size, malloc_log_malloc);
if (NULL != ptr) {
memset(ptr, 0, size);
}
return ptr;
}
void* __wrap_PR_Realloc(void* aPtr, size_t aSize)
{
if (gFirstTime) {
Init();
}
return ReallocHook(aPtr, aSize);
}
void __wrap_PR_Free(void* aPtr)
{
if (gFirstTime) {
Init();
}
FreeHook(aPtr, malloc_log_free);
}
#endif
//----------------------------------------
// Strong symbols so that libc references are routed to us
void* malloc(size_t aSize)
{
if (gFirstTime) {
Init();
}
return MallocHook(aSize, malloc_log_malloc);
}
void* realloc(void* aPtr, size_t aSize)
{
if (gFirstTime) {
Init();
}
return ReallocHook(aPtr, aSize);
}
void free(void* aPtr)
{
if (gFirstTime) {
Init();
}
FreeHook(aPtr, malloc_log_free);
}
void* calloc(size_t aSize, size_t aBsize)
{
if (gFirstTime) {
Init();
}
size_t size = aSize*aBsize;
void* ptr = MallocHook(size, malloc_log_malloc);
if (NULL != ptr) {
memset(ptr, 0, size);
}
return ptr;
}
void cfree(void* ptr)
{
if (gFirstTime) {
Init();
}
FreeHook(ptr, malloc_log_free);
}
void* memalign(size_t alignment, size_t size)
{
::abort();
}
void* valloc(size_t size)
{
::abort();
}
void* pvalloc(size_t size)
{
::abort();
}
void* __builtin_new(size_t aSize)
{
if (gFirstTime) {
Init();
}
return MallocHook(aSize, malloc_log_new);
}
void __builtin_delete(void* aPtr)
{
if (gFirstTime) {
Init();
}
FreeHook(aPtr, malloc_log_delete);
}
void* __builtin_vec_new(size_t aSize)
{
if (gFirstTime) {
Init();
}
return MallocHook(aSize, malloc_log_new);
}
void __builtin_vec_delete(void* aPtr)
{
if (gFirstTime) {
Init();
}
FreeHook(aPtr, malloc_log_delete);
}
void
__log_addref(void* p, int oldrc, int newrc)
{
if (gFirstTime) {
Init();
}
if (LIBMALLOC_LOG_RC & gFlags) {
Log(malloc_log_addref, p, size_t(oldrc), (void*)newrc);
}
}
void
__log_release(void* p, int oldrc, int newrc)
{
if (gFirstTime) {
Init();
}
if (LIBMALLOC_LOG_RC & gFlags) {
Log(malloc_log_release, p, size_t(oldrc), (void*)newrc);
}
}