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gecko/tools/trace-malloc/lib/nsTraceMalloc.c
L. David Baron b936bed6b6 Bug 331743 patch 3: Improve trace-malloc memory dumps and their handling on 64-bit. r=khuey 
There are three categories of improvements:

 (1) using size_t* rather than unsigned long* (and "%zX" rather than
     "%lX"), to better support platforms where sizeof(long) !=
     sizeof(void*), such as Win64 (untested, though).  This is a
     non-issue for 64-bit Linux (where I tested) and Mac.

 (2) Using the correct amount of 0-padding when printing addresses to
     show how much memory space is being printed.  In other words, using
     "%016zX" on 64-bit platforms instead of "%08zX".  This change is
     cosmetic-only, though it makes the logs much more understandable.

 (3) [in leaksoup.cpp only] Fixing an occurrence of assuming that
     sizeof(int) == sizeof(void*).  This occurrence led to printing only
     the lower half of each word in the output, after doing a correct
     analysis of the memory graph.

This patch is patching three files:

 (A) nsTraceMalloc.cpp, which is the in-process Gecko trace-malloc code
     that generates the memory dumps.

 (B) adreader.cpp, which is shared utility code for reading such a
     memory dump (currently used only by leaksoup.cpp)

 (C) leaksoup.cpp, which reads in such a memory dump, performs a
     strongly connected components analysis of the memory graph, and
     writes it back out, HTML-ized, with the roots listed at the top.

A fourth file appears to need no modification since it only looks at the
stack part of the dump and not the contents of the memory:

 (D) diffbloatdump.pl, which diffs two bloat dumps and produces a stack
     tree showing the change in allocations between them
2014-02-26 13:36:36 -08:00

2064 lines
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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* vim:cindent:ts=8:et:sw=4:
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifdef NS_TRACE_MALLOC
/*
* TODO:
* - FIXME https://bugzilla.mozilla.org/show_bug.cgi?id=392008
* - extend logfile so 'F' record tells free stack
*/
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#ifdef XP_UNIX
#include <unistd.h>
#include <sys/stat.h>
#include <sys/time.h>
#endif
#include "plhash.h"
#include "pratom.h"
#include "prlog.h"
#include "prlock.h"
#include "prmon.h"
#include "prprf.h"
#include "prenv.h"
#include "prnetdb.h"
#include "nsTraceMalloc.h"
#include "nscore.h"
#include "prinit.h"
#include "prthread.h"
#include "plstr.h"
#include "nsStackWalk.h"
#include "nsTraceMallocCallbacks.h"
#include "nsTypeInfo.h"
#include "mozilla/PoisonIOInterposer.h"
#if defined(XP_MACOSX)
#include <malloc/malloc.h>
#define WRITE_FLAGS "w"
#define __libc_malloc(x) malloc(x)
#define __libc_realloc(x, y) realloc(x, y)
#define __libc_free(x) free(x)
#elif defined(XP_UNIX)
#include <malloc.h>
#define WRITE_FLAGS "w"
#ifdef WRAP_SYSTEM_INCLUDES
#pragma GCC visibility push(default)
#endif
extern __ptr_t __libc_malloc(size_t);
extern __ptr_t __libc_calloc(size_t, size_t);
extern __ptr_t __libc_realloc(__ptr_t, size_t);
extern void __libc_free(__ptr_t);
extern __ptr_t __libc_memalign(size_t, size_t);
extern __ptr_t __libc_valloc(size_t);
#ifdef WRAP_SYSTEM_INCLUDES
#pragma GCC visibility pop
#endif
#elif defined(XP_WIN32)
#include <sys/timeb.h> /* for timeb */
#include <sys/stat.h> /* for fstat */
#include <io.h> /*for write*/
#define WRITE_FLAGS "w"
#define __libc_malloc(x) dhw_orig_malloc(x)
#define __libc_realloc(x, y) dhw_orig_realloc(x,y)
#define __libc_free(x) dhw_orig_free(x)
#else /* not XP_MACOSX, XP_UNIX, or XP_WIN32 */
# error "Unknown build configuration!"
#endif
typedef struct logfile logfile;
#define STARTUP_TMBUFSIZE (64 * 1024)
#define LOGFILE_TMBUFSIZE (16 * 1024)
struct logfile {
int fd;
int lfd; /* logical fd, dense among all logfiles */
char *buf;
int bufsize;
int pos;
uint32_t size;
uint32_t simsize;
logfile *next;
logfile **prevp;
};
static char default_buf[STARTUP_TMBUFSIZE];
static logfile default_logfile =
{-1, 0, default_buf, STARTUP_TMBUFSIZE, 0, 0, 0, NULL, NULL};
static logfile *logfile_list = NULL;
static logfile **logfile_tail = &logfile_list;
static logfile *logfp = &default_logfile;
static PRLock *tmlock = NULL;
#ifndef PATH_MAX
#define PATH_MAX 4096
#endif
static char sdlogname[PATH_MAX] = ""; /* filename for shutdown leak log */
/*
* This enables/disables trace-malloc logging.
*
* It is separate from suppress_tracing so that we do not have to pay
* the performance cost of repeated TM_TLS_GET_DATA calls when
* trace-malloc is disabled (which is not as bad as the locking we used
* to have).
*
* It must default to zero, since it can be tested by the Linux malloc
* hooks before NS_TraceMallocStartup sets it.
*/
static uint32_t tracing_enabled = 0;
/*
* Control whether we should log stacks
*/
static uint32_t stacks_enabled = 1;
/*
* This lock must be held while manipulating the calltree, the
* allocations table, the log, or the tmstats.
*
* Callers should not *enter* the lock without checking suppress_tracing
* first; otherwise they risk trying to re-enter on the same thread.
*/
#define TM_ENTER_LOCK(t) \
PR_BEGIN_MACRO \
PR_ASSERT(t->suppress_tracing != 0); \
if (tmlock) \
PR_Lock(tmlock); \
PR_END_MACRO
#define TM_EXIT_LOCK(t) \
PR_BEGIN_MACRO \
PR_ASSERT(t->suppress_tracing != 0); \
if (tmlock) \
PR_Unlock(tmlock); \
PR_END_MACRO
#define TM_SUPPRESS_TRACING_AND_ENTER_LOCK(t) \
PR_BEGIN_MACRO \
t->suppress_tracing++; \
TM_ENTER_LOCK(t); \
PR_END_MACRO
#define TM_EXIT_LOCK_AND_UNSUPPRESS_TRACING(t) \
PR_BEGIN_MACRO \
TM_EXIT_LOCK(t); \
t->suppress_tracing--; \
PR_END_MACRO
/*
* Thread-local storage.
*
* We can't use NSPR thread-local storage for this because it mallocs
* within PR_GetThreadPrivate (the first time) and PR_SetThreadPrivate
* (which can be worked around by protecting all uses of those functions
* with a monitor, ugh) and because it calls malloc/free when the
* thread-local storage is in an inconsistent state within
* PR_SetThreadPrivate (when expanding the thread-local storage array)
* and _PRI_DetachThread (when and after deleting the thread-local
* storage array).
*/
#ifdef XP_WIN32
#include <windows.h>
#define TM_TLS_INDEX_TYPE DWORD
#define TM_CREATE_TLS_INDEX(i_) PR_BEGIN_MACRO \
(i_) = TlsAlloc(); \
PR_END_MACRO
#define TM_DESTROY_TLS_INDEX(i_) TlsFree((i_))
#define TM_GET_TLS_DATA(i_) TlsGetValue((i_))
#define TM_SET_TLS_DATA(i_, v_) TlsSetValue((i_), (v_))
#else
#include <pthread.h>
#define TM_TLS_INDEX_TYPE pthread_key_t
#define TM_CREATE_TLS_INDEX(i_) pthread_key_create(&(i_), NULL)
#define TM_DESTROY_TLS_INDEX(i_) pthread_key_delete((i_))
#define TM_GET_TLS_DATA(i_) pthread_getspecific((i_))
#define TM_SET_TLS_DATA(i_, v_) pthread_setspecific((i_), (v_))
#endif
static TM_TLS_INDEX_TYPE tls_index;
static PRBool tls_index_initialized = PR_FALSE;
/* FIXME (maybe): This is currently unused; we leak the thread-local data. */
#if 0
static void
free_tm_thread(void *priv)
{
tm_thread *t = (tm_thread*) priv;
PR_ASSERT(t->suppress_tracing == 0);
if (t->in_heap) {
t->suppress_tracing = 1;
if (t->backtrace_buf.buffer)
__libc_free(t->backtrace_buf.buffer);
__libc_free(t);
}
}
#endif
tm_thread *
tm_get_thread(void)
{
tm_thread *t;
tm_thread stack_tm_thread;
if (!tls_index_initialized) {
/**
* Assume that the first call to |malloc| will occur before
* there are multiple threads. (If that's not the case, we
* probably need to do the necessary synchronization without
* using NSPR primitives. See discussion in
* https://bugzilla.mozilla.org/show_bug.cgi?id=442192
*/
TM_CREATE_TLS_INDEX(tls_index);
tls_index_initialized = PR_TRUE;
}
t = TM_GET_TLS_DATA(tls_index);
if (!t) {
/*
* First, store a tm_thread on the stack to suppress for the
* malloc below
*/
stack_tm_thread.suppress_tracing = 1;
stack_tm_thread.backtrace_buf.buffer = NULL;
stack_tm_thread.backtrace_buf.size = 0;
stack_tm_thread.backtrace_buf.entries = 0;
TM_SET_TLS_DATA(tls_index, &stack_tm_thread);
t = (tm_thread*) __libc_malloc(sizeof(tm_thread));
t->suppress_tracing = 0;
t->backtrace_buf = stack_tm_thread.backtrace_buf;
TM_SET_TLS_DATA(tls_index, t);
PR_ASSERT(stack_tm_thread.suppress_tracing == 1); /* balanced */
}
return t;
}
/* We don't want more than 32 logfiles open at once, ok? */
typedef uint32_t lfd_set;
#define LFD_SET_STATIC_INITIALIZER 0
#define LFD_SET_SIZE 32
#define LFD_ZERO(s) (*(s) = 0)
#define LFD_BIT(i) ((uint32_t)1 << (i))
#define LFD_TEST(i,s) (LFD_BIT(i) & *(s))
#define LFD_SET(i,s) (*(s) |= LFD_BIT(i))
#define LFD_CLR(i,s) (*(s) &= ~LFD_BIT(i))
static logfile *get_logfile(int fd)
{
logfile *fp;
int lfd;
for (fp = logfile_list; fp; fp = fp->next) {
if (fp->fd == fd)
return fp;
}
lfd = 0;
retry:
for (fp = logfile_list; fp; fp = fp->next) {
if (fp->fd == lfd) {
if (++lfd >= LFD_SET_SIZE)
return NULL;
goto retry;
}
}
fp = __libc_malloc(sizeof(logfile) + LOGFILE_TMBUFSIZE);
if (!fp)
return NULL;
fp->fd = fd;
fp->lfd = lfd;
fp->buf = (char*) (fp + 1);
fp->bufsize = LOGFILE_TMBUFSIZE;
fp->pos = 0;
fp->size = fp->simsize = 0;
fp->next = NULL;
fp->prevp = logfile_tail;
*logfile_tail = fp;
logfile_tail = &fp->next;
return fp;
}
static void flush_logfile(logfile *fp)
{
int len, cnt, fd;
char *bp;
len = fp->pos;
if (len == 0)
return;
fp->pos = 0;
fd = fp->fd;
if (fd >= 0) {
fp->size += len;
bp = fp->buf;
do {
cnt = write(fd, bp, len);
if (cnt <= 0) {
printf("### nsTraceMalloc: write failed or wrote 0 bytes!\n");
return;
}
bp += cnt;
len -= cnt;
} while (len > 0);
}
fp->simsize += len;
}
static void log_byte(logfile *fp, char byte)
{
if (fp->pos == fp->bufsize)
flush_logfile(fp);
fp->buf[fp->pos++] = byte;
}
static void log_string(logfile *fp, const char *str)
{
int len, rem, cnt;
len = strlen(str) + 1; /* include null terminator */
while ((rem = fp->pos + len - fp->bufsize) > 0) {
cnt = len - rem;
memcpy(&fp->buf[fp->pos], str, cnt);
str += cnt;
fp->pos += cnt;
flush_logfile(fp);
len = rem;
}
memcpy(&fp->buf[fp->pos], str, len);
fp->pos += len;
}
static void log_filename(logfile* fp, const char* filename)
{
if (strlen(filename) < 512) {
char *bp, *cp, buf[512];
bp = strstr(strcpy(buf, filename), "mozilla");
if (!bp)
bp = buf;
for (cp = bp; *cp; cp++) {
if (*cp == '\\')
*cp = '/';
}
filename = bp;
}
log_string(fp, filename);
}
static void log_uint32(logfile *fp, uint32_t ival)
{
if (ival < 0x80) {
/* 0xxx xxxx */
log_byte(fp, (char) ival);
} else if (ival < 0x4000) {
/* 10xx xxxx xxxx xxxx */
log_byte(fp, (char) ((ival >> 8) | 0x80));
log_byte(fp, (char) (ival & 0xff));
} else if (ival < 0x200000) {
/* 110x xxxx xxxx xxxx xxxx xxxx */
log_byte(fp, (char) ((ival >> 16) | 0xc0));
log_byte(fp, (char) ((ival >> 8) & 0xff));
log_byte(fp, (char) (ival & 0xff));
} else if (ival < 0x10000000) {
/* 1110 xxxx xxxx xxxx xxxx xxxx xxxx xxxx */
log_byte(fp, (char) ((ival >> 24) | 0xe0));
log_byte(fp, (char) ((ival >> 16) & 0xff));
log_byte(fp, (char) ((ival >> 8) & 0xff));
log_byte(fp, (char) (ival & 0xff));
} else {
/* 1111 0000 xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx */
log_byte(fp, (char) 0xf0);
log_byte(fp, (char) ((ival >> 24) & 0xff));
log_byte(fp, (char) ((ival >> 16) & 0xff));
log_byte(fp, (char) ((ival >> 8) & 0xff));
log_byte(fp, (char) (ival & 0xff));
}
}
static void log_event1(logfile *fp, char event, uint32_t serial)
{
log_byte(fp, event);
log_uint32(fp, (uint32_t) serial);
}
static void log_event2(logfile *fp, char event, uint32_t serial, size_t size)
{
log_event1(fp, event, serial);
log_uint32(fp, (uint32_t) size);
}
static void log_event3(logfile *fp, char event, uint32_t serial, size_t oldsize,
size_t size)
{
log_event2(fp, event, serial, oldsize);
log_uint32(fp, (uint32_t) size);
}
static void log_event4(logfile *fp, char event, uint32_t serial, uint32_t ui2,
uint32_t ui3, uint32_t ui4)
{
log_event3(fp, event, serial, ui2, ui3);
log_uint32(fp, ui4);
}
static void log_event5(logfile *fp, char event, uint32_t serial, uint32_t ui2,
uint32_t ui3, uint32_t ui4, uint32_t ui5)
{
log_event4(fp, event, serial, ui2, ui3, ui4);
log_uint32(fp, ui5);
}
static void log_event6(logfile *fp, char event, uint32_t serial, uint32_t ui2,
uint32_t ui3, uint32_t ui4, uint32_t ui5, uint32_t ui6)
{
log_event5(fp, event, serial, ui2, ui3, ui4, ui5);
log_uint32(fp, ui6);
}
static void log_event7(logfile *fp, char event, uint32_t serial, uint32_t ui2,
uint32_t ui3, uint32_t ui4, uint32_t ui5, uint32_t ui6,
uint32_t ui7)
{
log_event6(fp, event, serial, ui2, ui3, ui4, ui5, ui6);
log_uint32(fp, ui7);
}
static void log_event8(logfile *fp, char event, uint32_t serial, uint32_t ui2,
uint32_t ui3, uint32_t ui4, uint32_t ui5, uint32_t ui6,
uint32_t ui7, uint32_t ui8)
{
log_event7(fp, event, serial, ui2, ui3, ui4, ui5, ui6, ui7);
log_uint32(fp, ui8);
}
typedef struct callsite callsite;
struct callsite {
void* pc;
uint32_t serial;
lfd_set lfdset;
const char *name; /* pointer to string owned by methods table */
const char *library; /* pointer to string owned by libraries table */
int offset;
callsite *parent;
callsite *siblings;
callsite *kids;
};
/* NB: these counters are incremented and decremented only within tmlock. */
static uint32_t library_serial_generator = 0;
static uint32_t method_serial_generator = 0;
static uint32_t callsite_serial_generator = 0;
static uint32_t tmstats_serial_generator = 0;
static uint32_t filename_serial_generator = 0;
/* Root of the tree of callsites, the sum of all (cycle-compressed) stacks. */
static callsite calltree_root =
{0, 0, LFD_SET_STATIC_INITIALIZER, NULL, NULL, 0, NULL, NULL, NULL};
/* a fake pc for when stacks are disabled; must be different from the
pc in calltree_root */
#define STACK_DISABLED_PC ((void*)1)
/* Basic instrumentation. */
static nsTMStats tmstats = NS_TMSTATS_STATIC_INITIALIZER;
/* Parent with the most kids (tmstats.calltree_maxkids). */
static callsite *calltree_maxkids_parent;
/* Calltree leaf for path with deepest stack backtrace. */
static callsite *calltree_maxstack_top;
/* Last site (i.e., calling pc) that recurred during a backtrace. */
static callsite *last_callsite_recurrence;
static void log_tmstats(logfile *fp)
{
log_event1(fp, TM_EVENT_STATS, ++tmstats_serial_generator);
log_uint32(fp, tmstats.calltree_maxstack);
log_uint32(fp, tmstats.calltree_maxdepth);
log_uint32(fp, tmstats.calltree_parents);
log_uint32(fp, tmstats.calltree_maxkids);
log_uint32(fp, tmstats.calltree_kidhits);
log_uint32(fp, tmstats.calltree_kidmisses);
log_uint32(fp, tmstats.calltree_kidsteps);
log_uint32(fp, tmstats.callsite_recurrences);
log_uint32(fp, tmstats.backtrace_calls);
log_uint32(fp, tmstats.backtrace_failures);
log_uint32(fp, tmstats.btmalloc_failures);
log_uint32(fp, tmstats.dladdr_failures);
log_uint32(fp, tmstats.malloc_calls);
log_uint32(fp, tmstats.malloc_failures);
log_uint32(fp, tmstats.calloc_calls);
log_uint32(fp, tmstats.calloc_failures);
log_uint32(fp, tmstats.realloc_calls);
log_uint32(fp, tmstats.realloc_failures);
log_uint32(fp, tmstats.free_calls);
log_uint32(fp, tmstats.null_free_calls);
log_uint32(fp, calltree_maxkids_parent ? calltree_maxkids_parent->serial
: 0);
log_uint32(fp, calltree_maxstack_top ? calltree_maxstack_top->serial : 0);
}
static void *generic_alloctable(void *pool, size_t size)
{
return __libc_malloc(size);
}
static void generic_freetable(void *pool, void *item)
{
__libc_free(item);
}
typedef struct lfdset_entry {
PLHashEntry base;
lfd_set lfdset;
} lfdset_entry;
static PLHashEntry *lfdset_allocentry(void *pool, const void *key)
{
lfdset_entry *le = __libc_malloc(sizeof *le);
if (le)
LFD_ZERO(&le->lfdset);
return &le->base;
}
static void lfdset_freeentry(void *pool, PLHashEntry *he, unsigned flag)
{
lfdset_entry *le;
if (flag != HT_FREE_ENTRY)
return;
le = (lfdset_entry*) he;
__libc_free((void*) le);
}
static PLHashAllocOps lfdset_hashallocops = {
generic_alloctable, generic_freetable,
lfdset_allocentry, lfdset_freeentry
};
/* Table of library pathnames mapped to to logged 'L' record serial numbers. */
static PLHashTable *libraries = NULL;
/* Table of filename pathnames mapped to logged 'G' record serial numbers. */
static PLHashTable *filenames = NULL;
/* Table mapping method names to logged 'N' record serial numbers. */
static PLHashTable *methods = NULL;
/*
* Presumes that its caller is holding tmlock, but may temporarily exit
* the lock.
*/
static callsite *
calltree(void **stack, size_t num_stack_entries, tm_thread *t)
{
logfile *fp = logfp;
void *pc;
uint32_t nkids;
callsite *parent, *site, **csp, *tmp;
int maxstack;
uint32_t library_serial, method_serial, filename_serial;
const char *library, *method, *filename;
char *slash;
PLHashNumber hash;
PLHashEntry **hep, *he;
lfdset_entry *le;
size_t stack_index;
nsCodeAddressDetails details;
nsresult rv;
maxstack = (num_stack_entries > tmstats.calltree_maxstack);
if (maxstack) {
/* these two are the same, although that used to be less clear */
tmstats.calltree_maxstack = num_stack_entries;
tmstats.calltree_maxdepth = num_stack_entries;
}
/* Reverse the stack again, finding and building a path in the tree. */
parent = &calltree_root;
stack_index = num_stack_entries;
do {
--stack_index;
pc = stack[stack_index];
csp = &parent->kids;
while ((site = *csp) != NULL) {
if (site->pc == pc) {
tmstats.calltree_kidhits++;
/* Put the most recently used site at the front of siblings. */
*csp = site->siblings;
site->siblings = parent->kids;
parent->kids = site;
/* Check whether we've logged for this site and logfile yet. */
if (!LFD_TEST(fp->lfd, &site->lfdset)) {
/*
* Some other logfile put this site in the calltree. We
* must log an event for site, and possibly first for its
* method and/or library. Note the code after the while
* loop that tests if (!site).
*/
break;
}
/* Site already built and logged to fp -- go up the stack. */
goto upward;
}
tmstats.calltree_kidsteps++;
csp = &site->siblings;
}
if (!site) {
tmstats.calltree_kidmisses++;
/* Check for recursion: see if pc is on our ancestor line. */
for (site = parent; site; site = site->parent) {
if (site->pc == pc) {
tmstats.callsite_recurrences++;
last_callsite_recurrence = site;
goto upward;
}
}
}
/*
* Not in tree at all, or not logged to fp: let's find our symbolic
* callsite info.
*/
if (!stacks_enabled) {
/*
* Fake the necessary information for our single fake stack
* frame.
*/
PL_strncpyz(details.library, "stacks_disabled",
sizeof(details.library));
details.loffset = 0;
details.filename[0] = '\0';
details.lineno = 0;
details.function[0] = '\0';
details.foffset = 0;
} else {
/*
* NS_DescribeCodeAddress can (on Linux) acquire a lock inside
* the shared library loader. Another thread might call malloc
* while holding that lock (when loading a shared library). So
* we have to exit tmlock around this call. For details, see
* https://bugzilla.mozilla.org/show_bug.cgi?id=363334#c3
*
* We could be more efficient by building the nodes in the
* calltree, exiting the monitor once to describe all of them,
* and then filling in the descriptions for any that hadn't been
* described already. But this is easier for now.
*/
TM_EXIT_LOCK(t);
rv = NS_DescribeCodeAddress(pc, &details);
TM_ENTER_LOCK(t);
if (NS_FAILED(rv)) {
tmstats.dladdr_failures++;
goto fail;
}
}
/* Check whether we need to emit a library trace record. */
library_serial = 0;
library = NULL;
if (details.library[0]) {
if (!libraries) {
libraries = PL_NewHashTable(100, PL_HashString,
PL_CompareStrings, PL_CompareValues,
&lfdset_hashallocops, NULL);
if (!libraries) {
tmstats.btmalloc_failures++;
goto fail;
}
}
hash = PL_HashString(details.library);
hep = PL_HashTableRawLookup(libraries, hash, details.library);
he = *hep;
if (he) {
library = (char*) he->key;
library_serial = (uint32_t) NS_PTR_TO_INT32(he->value);
le = (lfdset_entry *) he;
if (LFD_TEST(fp->lfd, &le->lfdset)) {
/* We already logged an event on fp for this library. */
le = NULL;
}
} else {
library = strdup(details.library);
if (library) {
library_serial = ++library_serial_generator;
he = PL_HashTableRawAdd(libraries, hep, hash, library,
NS_INT32_TO_PTR(library_serial));
}
if (!he) {
tmstats.btmalloc_failures++;
goto fail;
}
le = (lfdset_entry *) he;
}
if (le) {
/* Need to log an event to fp for this lib. */
slash = strrchr(library, '/');
log_event1(fp, TM_EVENT_LIBRARY, library_serial);
log_string(fp, slash ? slash + 1 : library);
LFD_SET(fp->lfd, &le->lfdset);
}
}
/* For compatibility with current log format, always emit a
* filename trace record, using "noname" / 0 when no file name
* is available. */
filename_serial = 0;
filename = details.filename[0] ? details.filename : "noname";
if (!filenames) {
filenames = PL_NewHashTable(100, PL_HashString,
PL_CompareStrings, PL_CompareValues,
&lfdset_hashallocops, NULL);
if (!filenames) {
tmstats.btmalloc_failures++;
return NULL;
}
}
hash = PL_HashString(filename);
hep = PL_HashTableRawLookup(filenames, hash, filename);
he = *hep;
if (he) {
filename = (char*) he->key;
filename_serial = (uint32_t) NS_PTR_TO_INT32(he->value);
le = (lfdset_entry *) he;
if (LFD_TEST(fp->lfd, &le->lfdset)) {
/* We already logged an event on fp for this filename. */
le = NULL;
}
} else {
filename = strdup(filename);
if (filename) {
filename_serial = ++filename_serial_generator;
he = PL_HashTableRawAdd(filenames, hep, hash, filename,
NS_INT32_TO_PTR(filename_serial));
}
if (!he) {
tmstats.btmalloc_failures++;
return NULL;
}
le = (lfdset_entry *) he;
}
if (le) {
/* Need to log an event to fp for this filename. */
log_event1(fp, TM_EVENT_FILENAME, filename_serial);
log_filename(fp, filename);
LFD_SET(fp->lfd, &le->lfdset);
}
if (!details.function[0]) {
PR_snprintf(details.function, sizeof(details.function),
"%s+%X", library ? library : "main", details.loffset);
}
/* Emit an 'N' (for New method, 'M' is for malloc!) event if needed. */
method_serial = 0;
if (!methods) {
methods = PL_NewHashTable(10000, PL_HashString,
PL_CompareStrings, PL_CompareValues,
&lfdset_hashallocops, NULL);
if (!methods) {
tmstats.btmalloc_failures++;
goto fail;
}
}
hash = PL_HashString(details.function);
hep = PL_HashTableRawLookup(methods, hash, details.function);
he = *hep;
if (he) {
method = (char*) he->key;
method_serial = (uint32_t) NS_PTR_TO_INT32(he->value);
le = (lfdset_entry *) he;
if (LFD_TEST(fp->lfd, &le->lfdset)) {
/* We already logged an event on fp for this method. */
le = NULL;
}
} else {
method = strdup(details.function);
if (method) {
method_serial = ++method_serial_generator;
he = PL_HashTableRawAdd(methods, hep, hash, method,
NS_INT32_TO_PTR(method_serial));
}
if (!he) {
tmstats.btmalloc_failures++;
return NULL;
}
le = (lfdset_entry *) he;
}
if (le) {
log_event4(fp, TM_EVENT_METHOD, method_serial, library_serial,
filename_serial, details.lineno);
log_string(fp, method);
LFD_SET(fp->lfd, &le->lfdset);
}
/* Create a new callsite record. */
if (!site) {
site = __libc_malloc(sizeof(callsite));
if (!site) {
tmstats.btmalloc_failures++;
goto fail;
}
/* Update parent and max-kids-per-parent stats. */
if (!parent->kids)
tmstats.calltree_parents++;
nkids = 1;
for (tmp = parent->kids; tmp; tmp = tmp->siblings)
nkids++;
if (nkids > tmstats.calltree_maxkids) {
tmstats.calltree_maxkids = nkids;
calltree_maxkids_parent = parent;
}
/* Insert the new site into the tree. */
site->pc = pc;
site->serial = ++callsite_serial_generator;
LFD_ZERO(&site->lfdset);
site->name = method;
site->library = library;
site->offset = details.loffset;
site->parent = parent;
site->siblings = parent->kids;
parent->kids = site;
site->kids = NULL;
}
/* Log the site with its parent, method, and offset. */
log_event4(fp, TM_EVENT_CALLSITE, site->serial, parent->serial,
method_serial, details.foffset);
LFD_SET(fp->lfd, &site->lfdset);
upward:
parent = site;
} while (stack_index > 0);
if (maxstack)
calltree_maxstack_top = site;
return site;
fail:
return NULL;
}
/*
* Buffer the stack from top at low index to bottom at high, so that we can
* reverse it in calltree.
*/
static void
stack_callback(void *pc, void *sp, void *closure)
{
stack_buffer_info *info = (stack_buffer_info*) closure;
/*
* If we run out of buffer, keep incrementing entries so that
* backtrace can call us again with a bigger buffer.
*/
if (info->entries < info->size)
info->buffer[info->entries] = pc;
++info->entries;
}
/*
* The caller MUST NOT be holding tmlock when calling backtrace.
* On return, if *immediate_abort is set, then the return value is NULL
* and the thread is in a very dangerous situation (e.g. holding
* sem_pool_lock in Mac OS X pthreads); the caller should bail out
* without doing anything (such as acquiring locks).
*/
static callsite *
backtrace(tm_thread *t, int skipFrames, int *immediate_abort)
{
callsite *site;
stack_buffer_info *info = &t->backtrace_buf;
void ** new_stack_buffer;
size_t new_stack_buffer_size;
nsresult rv;
t->suppress_tracing++;
if (!stacks_enabled) {
#if defined(XP_MACOSX)
/* Walk the stack, even if stacks_enabled is false. We do this to
check if we must set immediate_abort. */
info->entries = 0;
rv = NS_StackWalk(stack_callback, skipFrames, /* maxFrames */ 0, info,
0, NULL);
*immediate_abort = rv == NS_ERROR_UNEXPECTED;
if (rv == NS_ERROR_UNEXPECTED || info->entries == 0) {
t->suppress_tracing--;
return NULL;
}
#endif
/*
* Create a single fake stack frame so that all the tools get
* data in the correct format.
*/
*immediate_abort = 0;
if (info->size < 1) {
PR_ASSERT(!info->buffer); /* !info->size == !info->buffer */
info->buffer = __libc_malloc(1 * sizeof(void*));
if (!info->buffer)
return NULL;
info->size = 1;
}
info->entries = 1;
info->buffer[0] = STACK_DISABLED_PC;
} else {
/*
* NS_StackWalk can (on Windows) acquire a lock the shared library
* loader. Another thread might call malloc while holding that lock
* (when loading a shared library). So we can't be in tmlock during
* this call. For details, see
* https://bugzilla.mozilla.org/show_bug.cgi?id=374829#c8
*/
/*
* skipFrames == 0 means |backtrace| should show up, so don't use
* skipFrames + 1.
* NB: this call is repeated below if the buffer is too small.
*/
info->entries = 0;
rv = NS_StackWalk(stack_callback, skipFrames, /* maxFrames */ 0, info,
0, NULL);
*immediate_abort = rv == NS_ERROR_UNEXPECTED;
if (rv == NS_ERROR_UNEXPECTED || info->entries == 0) {
t->suppress_tracing--;
return NULL;
}
/*
* To avoid allocating in stack_callback (which, on Windows, is
* called on a different thread from the one we're running on here),
* reallocate here if it didn't have a big enough buffer (which
* includes the first call on any thread), and call it again.
*/
if (info->entries > info->size) {
new_stack_buffer_size = 2 * info->entries;
new_stack_buffer = __libc_realloc(info->buffer,
new_stack_buffer_size * sizeof(void*));
if (!new_stack_buffer)
return NULL;
info->buffer = new_stack_buffer;
info->size = new_stack_buffer_size;
/* and call NS_StackWalk again */
info->entries = 0;
NS_StackWalk(stack_callback, skipFrames, /* maxFrames */ 0, info,
0, NULL);
/* same stack */
PR_ASSERT(info->entries * 2 == new_stack_buffer_size);
}
}
TM_ENTER_LOCK(t);
site = calltree(info->buffer, info->entries, t);
tmstats.backtrace_calls++;
if (!site) {
tmstats.backtrace_failures++;
PR_ASSERT(tmstats.backtrace_failures < 100);
}
TM_EXIT_LOCK(t);
t->suppress_tracing--;
return site;
}
typedef struct allocation {
PLHashEntry entry;
size_t size;
FILE *trackfp; /* for allocation tracking */
} allocation;
#define ALLOC_HEAP_SIZE 150000
static allocation alloc_heap[ALLOC_HEAP_SIZE];
static allocation *alloc_freelist = NULL;
static int alloc_heap_initialized = 0;
static PLHashEntry *alloc_allocentry(void *pool, const void *key)
{
allocation **listp, *alloc;
int n;
if (!alloc_heap_initialized) {
n = ALLOC_HEAP_SIZE;
listp = &alloc_freelist;
for (alloc = alloc_heap; --n >= 0; alloc++) {
*listp = alloc;
listp = (allocation**) &alloc->entry.next;
}
*listp = NULL;
alloc_heap_initialized = 1;
}
listp = &alloc_freelist;
alloc = *listp;
if (!alloc)
return __libc_malloc(sizeof(allocation));
*listp = (allocation*) alloc->entry.next;
return &alloc->entry;
}
static void alloc_freeentry(void *pool, PLHashEntry *he, unsigned flag)
{
allocation *alloc;
if (flag != HT_FREE_ENTRY)
return;
alloc = (allocation*) he;
if ((ptrdiff_t)(alloc - alloc_heap) < (ptrdiff_t)ALLOC_HEAP_SIZE) {
alloc->entry.next = &alloc_freelist->entry;
alloc_freelist = alloc;
} else {
__libc_free((void*) alloc);
}
}
static PLHashAllocOps alloc_hashallocops = {
generic_alloctable, generic_freetable,
alloc_allocentry, alloc_freeentry
};
static PLHashNumber hash_pointer(const void *key)
{
return (PLHashNumber) key;
}
static PLHashTable *allocations = NULL;
static PLHashTable *new_allocations(void)
{
allocations = PL_NewHashTable(200000, hash_pointer,
PL_CompareValues, PL_CompareValues,
&alloc_hashallocops, NULL);
return allocations;
}
#define get_allocations() (allocations ? allocations : new_allocations())
#if defined(XP_MACOSX)
/* from malloc.c in Libc */
typedef void
malloc_logger_t(uint32_t type, uintptr_t arg1, uintptr_t arg2, uintptr_t arg3,
uintptr_t result, uint32_t num_hot_frames_to_skip);
extern malloc_logger_t *malloc_logger;
#define MALLOC_LOG_TYPE_ALLOCATE 2
#define MALLOC_LOG_TYPE_DEALLOCATE 4
#define MALLOC_LOG_TYPE_HAS_ZONE 8
#define MALLOC_LOG_TYPE_CLEARED 64
static void
my_malloc_logger(uint32_t type, uintptr_t arg1, uintptr_t arg2, uintptr_t arg3,
uintptr_t result, uint32_t num_hot_frames_to_skip)
{
uintptr_t all_args[3] = { arg1, arg2, arg3 };
uintptr_t *args = all_args + ((type & MALLOC_LOG_TYPE_HAS_ZONE) ? 1 : 0);
uint32_t alloc_type =
type & (MALLOC_LOG_TYPE_ALLOCATE | MALLOC_LOG_TYPE_DEALLOCATE);
tm_thread *t = tm_get_thread();
if (alloc_type == (MALLOC_LOG_TYPE_ALLOCATE | MALLOC_LOG_TYPE_DEALLOCATE)) {
ReallocCallback((void*)args[0], (void*)result, args[1], 0, 0, t);
} else if (alloc_type == MALLOC_LOG_TYPE_ALLOCATE) {
/*
* We don't get size/count information for calloc, so just use
* MallocCallback.
*/
MallocCallback((void*)result, args[0], 0, 0, t);
} else if (alloc_type == MALLOC_LOG_TYPE_DEALLOCATE) {
FreeCallback((void*)args[0], 0, 0, t);
}
}
static void
StartupHooker(void)
{
PR_ASSERT(!malloc_logger);
malloc_logger = my_malloc_logger;
}
static void
ShutdownHooker(void)
{
PR_ASSERT(malloc_logger == my_malloc_logger);
malloc_logger = NULL;
}
#elif defined(XP_UNIX)
/*
* We can't use glibc's malloc hooks because they can't be used in a
* threadsafe manner. They require unsetting the hooks to call into the
* original malloc implementation, and then resetting them when the
* original implementation returns. If another thread calls the same
* allocation function while the hooks are unset, we have no chance to
* intercept the call.
*/
NS_EXTERNAL_VIS_(__ptr_t)
malloc(size_t size)
{
uint32_t start, end;
__ptr_t ptr;
tm_thread *t;
if (!tracing_enabled || !PR_Initialized() ||
(t = tm_get_thread())->suppress_tracing != 0) {
return __libc_malloc(size);
}
t->suppress_tracing++;
start = PR_IntervalNow();
ptr = __libc_malloc(size);
end = PR_IntervalNow();
t->suppress_tracing--;
MallocCallback(ptr, size, start, end, t);
return ptr;
}
NS_EXTERNAL_VIS_(__ptr_t)
calloc(size_t count, size_t size)
{
uint32_t start, end;
__ptr_t ptr;
tm_thread *t;
if (!tracing_enabled || !PR_Initialized() ||
(t = tm_get_thread())->suppress_tracing != 0) {
return __libc_calloc(count, size);
}
t->suppress_tracing++;
start = PR_IntervalNow();
ptr = __libc_calloc(count, size);
end = PR_IntervalNow();
t->suppress_tracing--;
CallocCallback(ptr, count, size, start, end, t);
return ptr;
}
NS_EXTERNAL_VIS_(__ptr_t)
realloc(__ptr_t oldptr, size_t size)
{
uint32_t start, end;
__ptr_t ptr;
tm_thread *t;
if (!tracing_enabled || !PR_Initialized() ||
(t = tm_get_thread())->suppress_tracing != 0) {
return __libc_realloc(oldptr, size);
}
t->suppress_tracing++;
start = PR_IntervalNow();
ptr = __libc_realloc(oldptr, size);
end = PR_IntervalNow();
t->suppress_tracing--;
/* FIXME bug 392008: We could race with reallocation of oldptr. */
ReallocCallback(oldptr, ptr, size, start, end, t);
return ptr;
}
NS_EXTERNAL_VIS_(void*)
valloc(size_t size)
{
uint32_t start, end;
__ptr_t ptr;
tm_thread *t;
if (!tracing_enabled || !PR_Initialized() ||
(t = tm_get_thread())->suppress_tracing != 0) {
return __libc_valloc(size);
}
t->suppress_tracing++;
start = PR_IntervalNow();
ptr = __libc_valloc(size);
end = PR_IntervalNow();
t->suppress_tracing--;
MallocCallback(ptr, size, start, end, t);
return ptr;
}
NS_EXTERNAL_VIS_(void*)
memalign(size_t boundary, size_t size)
{
uint32_t start, end;
__ptr_t ptr;
tm_thread *t;
if (!tracing_enabled || !PR_Initialized() ||
(t = tm_get_thread())->suppress_tracing != 0) {
return __libc_memalign(boundary, size);
}
t->suppress_tracing++;
start = PR_IntervalNow();
ptr = __libc_memalign(boundary, size);
end = PR_IntervalNow();
t->suppress_tracing--;
MallocCallback(ptr, size, start, end, t);
return ptr;
}
NS_EXTERNAL_VIS_(int)
posix_memalign(void **memptr, size_t alignment, size_t size)
{
__ptr_t ptr = memalign(alignment, size);
if (!ptr)
return ENOMEM;
*memptr = ptr;
return 0;
}
NS_EXTERNAL_VIS_(void)
free(__ptr_t ptr)
{
uint32_t start, end;
tm_thread *t;
if (!tracing_enabled || !PR_Initialized() ||
(t = tm_get_thread())->suppress_tracing != 0) {
__libc_free(ptr);
return;
}
t->suppress_tracing++;
start = PR_IntervalNow();
__libc_free(ptr);
end = PR_IntervalNow();
t->suppress_tracing--;
/* FIXME bug 392008: We could race with reallocation of ptr. */
FreeCallback(ptr, start, end, t);
}
NS_EXTERNAL_VIS_(void)
cfree(void *ptr)
{
free(ptr);
}
#define StartupHooker() PR_BEGIN_MACRO PR_END_MACRO
#define ShutdownHooker() PR_BEGIN_MACRO PR_END_MACRO
#elif defined(XP_WIN32)
/* See nsWinTraceMalloc.cpp. */
#endif
static const char magic[] = NS_TRACE_MALLOC_MAGIC;
static void
log_header(int logfd)
{
uint32_t ticksPerSec = PR_htonl(PR_TicksPerSecond());
(void) write(logfd, magic, NS_TRACE_MALLOC_MAGIC_SIZE);
(void) write(logfd, &ticksPerSec, sizeof ticksPerSec);
}
PR_IMPLEMENT(void)
NS_TraceMallocStartup(int logfd)
{
const char* stack_disable_env;
/* We must be running on the primordial thread. */
PR_ASSERT(tracing_enabled == 0);
PR_ASSERT(logfp == &default_logfile);
tracing_enabled = (logfd >= 0);
if (logfd >= 3)
MozillaRegisterDebugFD(logfd);
/* stacks are disabled if this env var is set to a non-empty value */
stack_disable_env = PR_GetEnv("NS_TRACE_MALLOC_DISABLE_STACKS");
stacks_enabled = !stack_disable_env || !*stack_disable_env;
if (tracing_enabled) {
PR_ASSERT(logfp->simsize == 0); /* didn't overflow startup buffer */
/* Log everything in logfp (aka default_logfile)'s buffer to logfd. */
logfp->fd = logfd;
logfile_list = &default_logfile;
logfp->prevp = &logfile_list;
logfile_tail = &logfp->next;
log_header(logfd);
}
RegisterTraceMallocShutdown();
tmlock = PR_NewLock();
(void) tm_get_thread(); /* ensure index initialization while it's easy */
if (tracing_enabled)
StartupHooker();
}
/*
* Options for log files, with the log file name either as the next option
* or separated by '=' (e.g. "./mozilla --trace-malloc * malloc.log" or
* "./mozilla --trace-malloc=malloc.log").
*/
static const char TMLOG_OPTION[] = "--trace-malloc";
static const char SDLOG_OPTION[] = "--shutdown-leaks";
#define SHOULD_PARSE_ARG(name_, log_, arg_) \
(0 == strncmp(arg_, name_, sizeof(name_) - 1))
#define PARSE_ARG(name_, log_, argv_, i_, consumed_) \
PR_BEGIN_MACRO \
char _nextchar = argv_[i_][sizeof(name_) - 1]; \
if (_nextchar == '=') { \
log_ = argv_[i_] + sizeof(name_); \
consumed_ = 1; \
} else if (_nextchar == '\0') { \
log_ = argv_[i_+1]; \
consumed_ = 2; \
} \
PR_END_MACRO
PR_IMPLEMENT(int)
NS_TraceMallocStartupArgs(int argc, char **argv)
{
int i, logfd = -1, consumed, logflags;
char *tmlogname = NULL, *sdlogname_local = NULL;
/*
* Look for the --trace-malloc <logfile> option early, to avoid missing
* early mallocs (we miss static constructors whose output overflows the
* log file's static 16K output buffer).
*/
for (i = 1; i < argc; i += consumed) {
consumed = 0;
if (SHOULD_PARSE_ARG(TMLOG_OPTION, tmlogname, argv[i]))
PARSE_ARG(TMLOG_OPTION, tmlogname, argv, i, consumed);
else if (SHOULD_PARSE_ARG(SDLOG_OPTION, sdlogname_local, argv[i]))
PARSE_ARG(SDLOG_OPTION, sdlogname_local, argv, i, consumed);
if (consumed) {
#ifndef XP_WIN32 /* If we don't comment this out, it will crash Windows. */
int j;
/* Now remove --trace-malloc and its argument from argv. */
argc -= consumed;
for (j = i; j < argc; ++j)
argv[j] = argv[j+consumed];
argv[argc] = NULL;
consumed = 0; /* don't advance next iteration */
#endif
} else {
consumed = 1;
}
}
if (tmlogname) {
#ifdef XP_UNIX
int pipefds[2];
#endif
switch (*tmlogname) {
#ifdef XP_UNIX
case '|':
if (pipe(pipefds) == 0) {
pid_t pid = fork();
if (pid == 0) {
/* In child: set up stdin, parse args, and exec. */
int maxargc, nargc;
char **nargv, *token;
if (pipefds[0] != 0) {
dup2(pipefds[0], 0);
close(pipefds[0]);
}
close(pipefds[1]);
tmlogname = strtok(tmlogname + 1, " \t");
maxargc = 3;
nargv = (char **) malloc((maxargc+1) * sizeof(char *));
if (!nargv) exit(1);
nargc = 0;
nargv[nargc++] = tmlogname;
while ((token = strtok(NULL, " \t")) != NULL) {
if (nargc == maxargc) {
maxargc *= 2;
nargv = (char**)
realloc(nargv, (maxargc+1) * sizeof(char*));
if (!nargv) exit(1);
}
nargv[nargc++] = token;
}
nargv[nargc] = NULL;
(void) setsid();
execvp(tmlogname, nargv);
exit(127);
}
if (pid > 0) {
/* In parent: set logfd to the pipe's write side. */
close(pipefds[0]);
logfd = pipefds[1];
}
}
if (logfd < 0) {
fprintf(stderr,
"%s: can't pipe to trace-malloc child process %s: %s\n",
argv[0], tmlogname, strerror(errno));
exit(1);
}
break;
#endif /*XP_UNIX*/
case '-':
/* Don't log from startup, but do prepare to log later. */
/* XXX traditional meaning of '-' as option argument is "stdin" or "stdout" */
if (tmlogname[1] == '\0')
break;
/* FALL THROUGH */
default:
logflags = O_CREAT | O_WRONLY | O_TRUNC;
#if defined(XP_WIN32)
/*
* Avoid translations on WIN32.
*/
logflags |= O_BINARY;
#endif
logfd = open(tmlogname, logflags, 0644);
if (logfd < 0) {
fprintf(stderr,
"%s: can't create trace-malloc log named %s: %s\n",
argv[0], tmlogname, strerror(errno));
exit(1);
}
break;
}
}
if (sdlogname_local) {
strncpy(sdlogname, sdlogname_local, sizeof(sdlogname));
sdlogname[sizeof(sdlogname) - 1] = '\0';
}
NS_TraceMallocStartup(logfd);
return argc;
}
PR_IMPLEMENT(PRBool)
NS_TraceMallocHasStarted(void)
{
return tmlock ? PR_TRUE : PR_FALSE;
}
PR_IMPLEMENT(void)
NS_TraceMallocShutdown(void)
{
logfile *fp;
if (sdlogname[0])
NS_TraceMallocDumpAllocations(sdlogname);
if (tmstats.backtrace_failures) {
fprintf(stderr,
"TraceMalloc backtrace failures: %lu (malloc %lu dladdr %lu)\n",
(unsigned long) tmstats.backtrace_failures,
(unsigned long) tmstats.btmalloc_failures,
(unsigned long) tmstats.dladdr_failures);
}
while ((fp = logfile_list) != NULL) {
logfile_list = fp->next;
log_tmstats(fp);
flush_logfile(fp);
if (fp->fd >= 0) {
MozillaUnRegisterDebugFD(fp->fd);
close(fp->fd);
fp->fd = -1;
}
if (fp != &default_logfile) {
if (fp == logfp)
logfp = &default_logfile;
free((void*) fp);
}
}
if (tmlock) {
PRLock *lock = tmlock;
tmlock = NULL;
PR_DestroyLock(lock);
}
if (tracing_enabled) {
tracing_enabled = 0;
ShutdownHooker();
}
}
PR_IMPLEMENT(void)
NS_TraceMallocDisable(void)
{
tm_thread *t = tm_get_thread();
logfile *fp;
uint32_t sample;
/* Robustify in case of duplicate call. */
PR_ASSERT(tracing_enabled);
if (tracing_enabled == 0)
return;
TM_SUPPRESS_TRACING_AND_ENTER_LOCK(t);
for (fp = logfile_list; fp; fp = fp->next)
flush_logfile(fp);
sample = --tracing_enabled;
TM_EXIT_LOCK_AND_UNSUPPRESS_TRACING(t);
if (sample == 0)
ShutdownHooker();
}
PR_IMPLEMENT(void)
NS_TraceMallocEnable(void)
{
tm_thread *t = tm_get_thread();
uint32_t sample;
TM_SUPPRESS_TRACING_AND_ENTER_LOCK(t);
sample = ++tracing_enabled;
TM_EXIT_LOCK_AND_UNSUPPRESS_TRACING(t);
if (sample == 1)
StartupHooker();
}
PR_IMPLEMENT(int)
NS_TraceMallocChangeLogFD(int fd)
{
logfile *oldfp, *fp;
struct stat sb;
tm_thread *t = tm_get_thread();
TM_SUPPRESS_TRACING_AND_ENTER_LOCK(t);
oldfp = logfp;
if (oldfp->fd != fd) {
flush_logfile(oldfp);
fp = get_logfile(fd);
if (!fp) {
TM_EXIT_LOCK_AND_UNSUPPRESS_TRACING(t);
return -2;
}
if (fd >= 0 && fstat(fd, &sb) == 0 && sb.st_size == 0)
log_header(fd);
logfp = fp;
}
TM_EXIT_LOCK_AND_UNSUPPRESS_TRACING(t);
return oldfp->fd;
}
static int
lfd_clr_enumerator(PLHashEntry *he, int i, void *arg)
{
lfdset_entry *le = (lfdset_entry*) he;
logfile *fp = (logfile*) arg;
LFD_CLR(fp->lfd, &le->lfdset);
return HT_ENUMERATE_NEXT;
}
static void
lfd_clr_walk(callsite *site, logfile *fp)
{
callsite *kid;
LFD_CLR(fp->lfd, &site->lfdset);
for (kid = site->kids; kid; kid = kid->siblings)
lfd_clr_walk(kid, fp);
}
PR_IMPLEMENT(void)
NS_TraceMallocCloseLogFD(int fd)
{
logfile *fp;
tm_thread *t = tm_get_thread();
TM_SUPPRESS_TRACING_AND_ENTER_LOCK(t);
fp = get_logfile(fd);
if (fp) {
flush_logfile(fp);
if (fp == &default_logfile) {
/* Leave default_logfile in logfile_list with an fd of -1. */
fp->fd = -1;
/* NB: we can never free lfd 0, it belongs to default_logfile. */
PR_ASSERT(fp->lfd == 0);
} else {
/* Clear fp->lfd in all possible lfdsets. */
PL_HashTableEnumerateEntries(libraries, lfd_clr_enumerator, fp);
PL_HashTableEnumerateEntries(methods, lfd_clr_enumerator, fp);
lfd_clr_walk(&calltree_root, fp);
/* Unlink fp from logfile_list, freeing lfd for reallocation. */
*fp->prevp = fp->next;
if (!fp->next) {
PR_ASSERT(logfile_tail == &fp->next);
logfile_tail = fp->prevp;
}
/* Reset logfp if we must, then free fp. */
if (fp == logfp)
logfp = &default_logfile;
free((void*) fp);
}
}
TM_EXIT_LOCK_AND_UNSUPPRESS_TRACING(t);
MozillaUnRegisterDebugFD(fd);
close(fd);
}
PR_IMPLEMENT(void)
NS_TraceMallocLogTimestamp(const char *caption)
{
logfile *fp;
#ifdef XP_UNIX
struct timeval tv;
#endif
#ifdef XP_WIN32
struct _timeb tb;
#endif
tm_thread *t = tm_get_thread();
TM_SUPPRESS_TRACING_AND_ENTER_LOCK(t);
fp = logfp;
log_byte(fp, TM_EVENT_TIMESTAMP);
#ifdef XP_UNIX
gettimeofday(&tv, NULL);
log_uint32(fp, (uint32_t) tv.tv_sec);
log_uint32(fp, (uint32_t) tv.tv_usec);
#endif
#ifdef XP_WIN32
_ftime(&tb);
log_uint32(fp, (uint32_t) tb.time);
log_uint32(fp, (uint32_t) tb.millitm);
#endif
log_string(fp, caption);
TM_EXIT_LOCK_AND_UNSUPPRESS_TRACING(t);
}
static void
print_stack(FILE *ofp, callsite *site)
{
while (site) {
if (site->name || site->parent) {
fprintf(ofp, "%s[%s +0x%X]\n",
site->name, site->library, site->offset);
}
site = site->parent;
}
}
static const char *allocation_format =
(sizeof(void*) == 4) ? "\t0x%08zX\n" :
(sizeof(void*) == 8) ? "\t0x%016zX\n" :
"UNEXPECTED sizeof(void*)";
static int
allocation_enumerator(PLHashEntry *he, int i, void *arg)
{
allocation *alloc = (allocation*) he;
FILE *ofp = (FILE*) arg;
callsite *site = (callsite*) he->value;
size_t *p, *end;
fprintf(ofp, "%p <%s> (%lu)\n",
he->key,
nsGetTypeName(he->key),
(unsigned long) alloc->size);
for (p = (size_t*) he->key,
end = (size_t*) ((char*)he->key + alloc->size);
p < end; ++p) {
fprintf(ofp, allocation_format, *p);
}
print_stack(ofp, site);
fputc('\n', ofp);
return HT_ENUMERATE_NEXT;
}
PR_IMPLEMENT(void)
NS_TraceStack(int skip, FILE *ofp)
{
callsite *site;
tm_thread *t = tm_get_thread();
int immediate_abort;
site = backtrace(t, skip + 1, &immediate_abort);
while (site) {
if (site->name || site->parent) {
fprintf(ofp, "%s[%s +0x%X]\n",
site->name, site->library, site->offset);
}
site = site->parent;
}
}
PR_IMPLEMENT(int)
NS_TraceMallocDumpAllocations(const char *pathname)
{
FILE *ofp;
int rv;
int fd;
tm_thread *t = tm_get_thread();
TM_SUPPRESS_TRACING_AND_ENTER_LOCK(t);
ofp = fopen(pathname, WRITE_FLAGS);
if (ofp) {
MozillaRegisterDebugFD(fileno(ofp));
if (allocations) {
PL_HashTableEnumerateEntries(allocations, allocation_enumerator,
ofp);
}
rv = ferror(ofp) ? -1 : 0;
MozillaUnRegisterDebugFILE(ofp);
fclose(ofp);
} else {
rv = -1;
}
TM_EXIT_LOCK_AND_UNSUPPRESS_TRACING(t);
return rv;
}
PR_IMPLEMENT(void)
NS_TraceMallocFlushLogfiles(void)
{
logfile *fp;
tm_thread *t = tm_get_thread();
TM_SUPPRESS_TRACING_AND_ENTER_LOCK(t);
for (fp = logfile_list; fp; fp = fp->next)
flush_logfile(fp);
TM_EXIT_LOCK_AND_UNSUPPRESS_TRACING(t);
}
PR_IMPLEMENT(void)
NS_TrackAllocation(void* ptr, FILE *ofp)
{
allocation *alloc;
tm_thread *t = tm_get_thread();
fprintf(ofp, "Trying to track %p\n", (void*) ptr);
setlinebuf(ofp);
TM_SUPPRESS_TRACING_AND_ENTER_LOCK(t);
if (get_allocations()) {
alloc = (allocation*)
*PL_HashTableRawLookup(allocations, hash_pointer(ptr), ptr);
if (alloc) {
fprintf(ofp, "Tracking %p\n", (void*) ptr);
alloc->trackfp = ofp;
} else {
fprintf(ofp, "Not tracking %p\n", (void*) ptr);
}
}
TM_EXIT_LOCK_AND_UNSUPPRESS_TRACING(t);
}
PR_IMPLEMENT(void)
MallocCallback(void *ptr, size_t size, uint32_t start, uint32_t end, tm_thread *t)
{
callsite *site;
PLHashEntry *he;
allocation *alloc;
int immediate_abort;
if (!tracing_enabled || t->suppress_tracing != 0)
return;
site = backtrace(t, 2, &immediate_abort);
if (immediate_abort)
return;
TM_SUPPRESS_TRACING_AND_ENTER_LOCK(t);
tmstats.malloc_calls++;
if (!ptr) {
tmstats.malloc_failures++;
} else {
if (site) {
log_event5(logfp, TM_EVENT_MALLOC,
site->serial, start, end - start,
(uint32_t)NS_PTR_TO_INT32(ptr), size);
}
if (get_allocations()) {
he = PL_HashTableAdd(allocations, ptr, site);
if (he) {
alloc = (allocation*) he;
alloc->size = size;
alloc->trackfp = NULL;
}
}
}
TM_EXIT_LOCK_AND_UNSUPPRESS_TRACING(t);
}
PR_IMPLEMENT(void)
CallocCallback(void *ptr, size_t count, size_t size, uint32_t start, uint32_t end, tm_thread *t)
{
callsite *site;
PLHashEntry *he;
allocation *alloc;
int immediate_abort;
if (!tracing_enabled || t->suppress_tracing != 0)
return;
site = backtrace(t, 2, &immediate_abort);
if (immediate_abort)
return;
TM_SUPPRESS_TRACING_AND_ENTER_LOCK(t);
tmstats.calloc_calls++;
if (!ptr) {
tmstats.calloc_failures++;
} else {
size *= count;
if (site) {
log_event5(logfp, TM_EVENT_CALLOC,
site->serial, start, end - start,
(uint32_t)NS_PTR_TO_INT32(ptr), size);
}
if (get_allocations()) {
he = PL_HashTableAdd(allocations, ptr, site);
if (he) {
alloc = (allocation*) he;
alloc->size = size;
alloc->trackfp = NULL;
}
}
}
TM_EXIT_LOCK_AND_UNSUPPRESS_TRACING(t);
}
PR_IMPLEMENT(void)
ReallocCallback(void * oldptr, void *ptr, size_t size,
uint32_t start, uint32_t end, tm_thread *t)
{
callsite *oldsite, *site;
size_t oldsize;
PLHashNumber hash;
PLHashEntry **hep, *he;
allocation *alloc;
FILE *trackfp = NULL;
int immediate_abort;
if (!tracing_enabled || t->suppress_tracing != 0)
return;
site = backtrace(t, 2, &immediate_abort);
if (immediate_abort)
return;
TM_SUPPRESS_TRACING_AND_ENTER_LOCK(t);
tmstats.realloc_calls++;
oldsite = NULL;
oldsize = 0;
hep = NULL;
he = NULL;
if (oldptr && get_allocations()) {
hash = hash_pointer(oldptr);
hep = PL_HashTableRawLookup(allocations, hash, oldptr);
he = *hep;
if (he) {
oldsite = (callsite*) he->value;
alloc = (allocation*) he;
oldsize = alloc->size;
trackfp = alloc->trackfp;
if (trackfp) {
fprintf(alloc->trackfp,
"\nrealloc(%p, %lu), oldsize %lu, alloc site %p\n",
(void*) ptr, (unsigned long) size,
(unsigned long) oldsize, (void*) oldsite);
NS_TraceStack(1, trackfp);
}
}
}
if (!ptr && size) {
/*
* When realloc() fails, the original block is not freed or moved, so
* we'll leave the allocation entry untouched.
*/
tmstats.realloc_failures++;
} else {
if (site) {
log_event8(logfp, TM_EVENT_REALLOC,
site->serial, start, end - start,
(uint32_t)NS_PTR_TO_INT32(ptr), size,
oldsite ? oldsite->serial : 0,
(uint32_t)NS_PTR_TO_INT32(oldptr), oldsize);
}
if (ptr && allocations) {
if (ptr != oldptr) {
/*
* If we're reallocating (not allocating new space by passing
* null to realloc) and realloc moved the block, free oldptr.
*/
if (he)
PL_HashTableRawRemove(allocations, hep, he);
/* Record the new allocation now, setting he. */
he = PL_HashTableAdd(allocations, ptr, site);
} else {
/*
* If we haven't yet recorded an allocation (possibly due to a
* temporary memory shortage), do it now.
*/
if (!he)
he = PL_HashTableAdd(allocations, ptr, site);
}
if (he) {
alloc = (allocation*) he;
alloc->size = size;
alloc->trackfp = trackfp;
}
}
}
TM_EXIT_LOCK_AND_UNSUPPRESS_TRACING(t);
}
PR_IMPLEMENT(void)
FreeCallback(void * ptr, uint32_t start, uint32_t end, tm_thread *t)
{
PLHashEntry **hep, *he;
callsite *site;
allocation *alloc;
if (!tracing_enabled || t->suppress_tracing != 0)
return;
/*
* FIXME: Perhaps we should call backtrace() so we can check for
* immediate_abort. However, the only current contexts where
* immediate_abort will be true do not call free(), so for now,
* let's avoid the cost of backtrace(). See bug 478195.
*/
TM_SUPPRESS_TRACING_AND_ENTER_LOCK(t);
tmstats.free_calls++;
if (!ptr) {
tmstats.null_free_calls++;
} else {
if (get_allocations()) {
hep = PL_HashTableRawLookup(allocations, hash_pointer(ptr), ptr);
he = *hep;
if (he) {
site = (callsite*) he->value;
if (site) {
alloc = (allocation*) he;
if (alloc->trackfp) {
fprintf(alloc->trackfp, "\nfree(%p), alloc site %p\n",
(void*) ptr, (void*) site);
NS_TraceStack(1, alloc->trackfp);
}
log_event5(logfp, TM_EVENT_FREE,
site->serial, start, end - start,
(uint32_t)NS_PTR_TO_INT32(ptr), alloc->size);
}
PL_HashTableRawRemove(allocations, hep, he);
}
}
}
TM_EXIT_LOCK_AND_UNSUPPRESS_TRACING(t);
}
PR_IMPLEMENT(nsTMStackTraceID)
NS_TraceMallocGetStackTrace(void)
{
callsite *site;
int dummy;
tm_thread *t = tm_get_thread();
PR_ASSERT(t->suppress_tracing == 0);
site = backtrace(t, 2, &dummy);
return (nsTMStackTraceID) site;
}
PR_IMPLEMENT(void)
NS_TraceMallocPrintStackTrace(FILE *ofp, nsTMStackTraceID id)
{
print_stack(ofp, (callsite *)id);
}
#endif /* NS_TRACE_MALLOC */
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