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gecko-dev/tools/trace-malloc/tmreader.c

875 строки
28 KiB
C
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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* 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 tmreader.h/tmreader.c code, released
* July 7, 2000.
*
* The Initial Developer of the Original Code is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 2000 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
* Brendan Eich, 7-July-2000
*
* Alternatively, the contents of this file may be used under the
* terms of the GNU Public License (the "GPL"), in which case the
* provisions of the GPL are applicable instead of those above.
* If you wish to allow use of your version of this file only
* under the terms of the GPL and not to allow others to use your
* version of this file under the MPL, indicate your decision by
* deleting the provisions above and replace them with the notice
* and other provisions required by the GPL. If you do not delete
* the provisions above, a recipient may use your version of this
* file under either the MPL or the GPL.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h> /* XXX push error reporting out to clients? */
#ifndef XP_WIN
#include <unistd.h>
#else
#include <stddef.h>
#endif
#include "prlog.h"
#include "plhash.h"
/* make sure this happens before tmreader.h */
#define PL_ARENA_CONST_ALIGN_MASK 2
#include "plarena.h"
#include "prnetdb.h"
#include "nsTraceMalloc.h"
#include "tmreader.h"
static int accum_byte(FILE *fp, uint32 *uip)
{
int c = getc(fp);
if (c == EOF)
return 0;
*uip = (*uip << 8) | c;
return 1;
}
static int get_uint32(FILE *fp, uint32 *uip)
{
int c;
uint32 ui;
c = getc(fp);
if (c == EOF)
return 0;
ui = 0;
if (c & 0x80) {
c &= 0x7f;
if (c & 0x40) {
c &= 0x3f;
if (c & 0x20) {
c &= 0x1f;
if (c & 0x10) {
if (!accum_byte(fp, &ui))
return 0;
} else {
ui = (uint32) c;
}
if (!accum_byte(fp, &ui))
return 0;
} else {
ui = (uint32) c;
}
if (!accum_byte(fp, &ui))
return 0;
} else {
ui = (uint32) c;
}
if (!accum_byte(fp, &ui))
return 0;
} else {
ui = (uint32) c;
}
*uip = ui;
return 1;
}
static char *get_string(FILE *fp)
{
char *cp;
int c;
static char buf[256];
static char *bp = buf, *ep = buf + sizeof buf;
static size_t bsize = sizeof buf;
cp = bp;
do {
c = getc(fp);
if (c == EOF)
return 0;
if (cp == ep) {
if (bp == buf) {
bp = malloc(2 * bsize);
if (bp)
memcpy(bp, buf, bsize);
} else {
bp = realloc(bp, 2 * bsize);
}
if (!bp)
return 0;
cp = bp + bsize;
bsize *= 2;
ep = bp + bsize;
}
*cp++ = c;
} while (c != '\0');
return strdup(bp);
}
static int get_tmevent(FILE *fp, tmevent *event)
{
int c;
char *s;
c = getc(fp);
if (c == EOF)
return 0;
event->type = (char) c;
if (!get_uint32(fp, &event->serial))
return 0;
switch (c) {
case TM_EVENT_LIBRARY:
s = get_string(fp);
if (!s)
return 0;
event->u.libname = s;
break;
case TM_EVENT_FILENAME:
s = get_string(fp);
if (!s)
return 0;
event->u.srcname = s;
break;
case TM_EVENT_METHOD:
if (!get_uint32(fp, &event->u.method.library))
return 0;
if (!get_uint32(fp, &event->u.method.filename))
return 0;
if (!get_uint32(fp, &event->u.method.linenumber))
return 0;
s = get_string(fp);
if (!s)
return 0;
event->u.method.name = s;
break;
case TM_EVENT_CALLSITE:
if (!get_uint32(fp, &event->u.site.parent))
return 0;
if (!get_uint32(fp, &event->u.site.method))
return 0;
if (!get_uint32(fp, &event->u.site.offset))
return 0;
break;
case TM_EVENT_MALLOC:
case TM_EVENT_CALLOC:
case TM_EVENT_FREE:
if (!get_uint32(fp, &event->u.alloc.interval))
return 0;
if (!get_uint32(fp, &event->u.alloc.cost))
return 0;
if (!get_uint32(fp, &event->u.alloc.ptr))
return 0;
if (!get_uint32(fp, &event->u.alloc.size))
return 0;
event->u.alloc.oldserial = 0;
event->u.alloc.oldptr = 0;
event->u.alloc.oldsize = 0;
#if defined(DEBUG_dp)
if (c == TM_EVENT_MALLOC)
printf("%d malloc %d 0x%p\n", event->u.alloc.cost,
event->u.alloc.size, event->u.alloc.ptr);
else if (c == TM_EVENT_CALLOC)
printf("%d calloc %d 0x%p\n", event->u.alloc.cost,
event->u.alloc.size, event->u.alloc.ptr);
else
printf("%d free %d 0x%p\n", event->u.alloc.cost,
event->u.alloc.size, event->u.alloc.ptr);
#endif
break;
case TM_EVENT_REALLOC:
if (!get_uint32(fp, &event->u.alloc.interval))
return 0;
if (!get_uint32(fp, &event->u.alloc.cost))
return 0;
if (!get_uint32(fp, &event->u.alloc.ptr))
return 0;
if (!get_uint32(fp, &event->u.alloc.size))
return 0;
if (!get_uint32(fp, &event->u.alloc.oldserial))
return 0;
if (!get_uint32(fp, &event->u.alloc.oldptr))
return 0;
if (!get_uint32(fp, &event->u.alloc.oldsize))
return 0;
#if defined(DEBUG_dp)
printf("%d realloc %d 0x%p %d\n", event->u.alloc.cost,
event->u.alloc.size, event->u.alloc.ptr, event->u.alloc.oldsize);
#endif
break;
case TM_EVENT_STATS:
if (!get_uint32(fp, &event->u.stats.tmstats.calltree_maxstack))
return 0;
if (!get_uint32(fp, &event->u.stats.tmstats.calltree_maxdepth))
return 0;
if (!get_uint32(fp, &event->u.stats.tmstats.calltree_parents))
return 0;
if (!get_uint32(fp, &event->u.stats.tmstats.calltree_maxkids))
return 0;
if (!get_uint32(fp, &event->u.stats.tmstats.calltree_kidhits))
return 0;
if (!get_uint32(fp, &event->u.stats.tmstats.calltree_kidmisses))
return 0;
if (!get_uint32(fp, &event->u.stats.tmstats.calltree_kidsteps))
return 0;
if (!get_uint32(fp, &event->u.stats.tmstats.callsite_recurrences))
return 0;
if (!get_uint32(fp, &event->u.stats.tmstats.backtrace_calls))
return 0;
if (!get_uint32(fp, &event->u.stats.tmstats.backtrace_failures))
return 0;
if (!get_uint32(fp, &event->u.stats.tmstats.btmalloc_failures))
return 0;
if (!get_uint32(fp, &event->u.stats.tmstats.dladdr_failures))
return 0;
if (!get_uint32(fp, &event->u.stats.tmstats.malloc_calls))
return 0;
if (!get_uint32(fp, &event->u.stats.tmstats.malloc_failures))
return 0;
if (!get_uint32(fp, &event->u.stats.tmstats.calloc_calls))
return 0;
if (!get_uint32(fp, &event->u.stats.tmstats.calloc_failures))
return 0;
if (!get_uint32(fp, &event->u.stats.tmstats.realloc_calls))
return 0;
if (!get_uint32(fp, &event->u.stats.tmstats.realloc_failures))
return 0;
if (!get_uint32(fp, &event->u.stats.tmstats.free_calls))
return 0;
if (!get_uint32(fp, &event->u.stats.tmstats.null_free_calls))
return 0;
if (!get_uint32(fp, &event->u.stats.calltree_maxkids_parent))
return 0;
if (!get_uint32(fp, &event->u.stats.calltree_maxstack_top))
return 0;
break;
}
return 1;
}
static void *arena_alloc(void* pool, PRSize size)
{
PLArenaPool* arena = (PLArenaPool*)pool;
void* result;
PL_ARENA_ALLOCATE(result, arena, size);
memset(result, 0, size);
return result;
}
static void *generic_alloctable(void *pool, PRSize size)
{
return arena_alloc(pool, size);
}
static void generic_freetable(void *pool, void *item)
{
/* do nothing - arena-allocated */
}
static PLHashEntry *filename_allocentry(void *pool, const void *key)
{
return (PLHashEntry*)arena_alloc(pool, sizeof(PLHashEntry));
}
static PLHashEntry *callsite_allocentry(void *pool, const void *key)
{
return (PLHashEntry*)arena_alloc(pool, sizeof(tmcallsite));
}
static init_graphnode(tmgraphnode* node)
{
node->in = node->out = NULL;
node->up = node->down = node->next = NULL;
node->low = 0;
node->allocs.bytes.direct = node->allocs.bytes.total = 0;
node->allocs.calls.direct = node->allocs.calls.total = 0;
node->frees.bytes.direct = node->frees.bytes.total = 0;
node->frees.calls.direct = node->frees.calls.total = 0;
node->sqsum = 0;
node->sort = -1;
}
static PLHashEntry *graphnode_allocentry(void *pool, const void *key)
{
tmgraphnode* node = (tmgraphnode*)arena_alloc(pool, sizeof(tmgraphnode));
if (!node)
return NULL;
init_graphnode(node);
return &node->entry;
}
static void init_method(tmmethodnode *node)
{
node->graphnode.in = node->graphnode.out = NULL;
node->graphnode.up = node->graphnode.down = node->graphnode.next = NULL;
node->graphnode.low = 0;
node->graphnode.allocs.bytes.direct = node->graphnode.allocs.bytes.total = 0;
node->graphnode.allocs.calls.direct = node->graphnode.allocs.calls.total = 0;
node->graphnode.frees.bytes.direct = node->graphnode.frees.bytes.total = 0;
node->graphnode.frees.calls.direct = node->graphnode.frees.calls.total = 0;
node->graphnode.sqsum = 0;
node->graphnode.sort = -1;
node->sourcefile = NULL;
node->linenumber = 0;
}
static PLHashEntry *method_allocentry(void *pool, const void *key)
{
tmmethodnode *node =
(tmmethodnode*) arena_alloc(pool, sizeof(tmmethodnode));
if (!node)
return NULL;
init_method(node);
return &node->graphnode.entry;
}
static void graphnode_freeentry(void *pool, PLHashEntry *he, PRUintn flag)
{
/* Always free the value, which points to a strdup'd string. */
free(he->value);
#if 0 /* using arenas now, no freeing! */
/* Free the whole thing if we're told to. */
if (flag == HT_FREE_ENTRY)
free((void*) he);
#endif
}
static void component_freeentry(void *pool, PLHashEntry *he, PRUintn flag)
{
if (flag == HT_FREE_ENTRY) {
tmgraphnode *comp = (tmgraphnode*) he;
/* Free the key, which was strdup'd (N.B. value also points to it). */
free((void*) tmcomponent_name(comp));
#if 0 /* using arenas now, no freeing! */
free((void*) comp);
#endif
}
}
static PLHashAllocOps filename_hashallocops = {
generic_alloctable, generic_freetable,
filename_allocentry, graphnode_freeentry
};
static PLHashAllocOps callsite_hashallocops = {
generic_alloctable, generic_freetable,
callsite_allocentry, graphnode_freeentry
};
static PLHashAllocOps graphnode_hashallocops = {
generic_alloctable, generic_freetable,
graphnode_allocentry, graphnode_freeentry
};
static PLHashAllocOps method_hashallocops = {
generic_alloctable, generic_freetable,
method_allocentry, graphnode_freeentry
};
static PLHashAllocOps component_hashallocops = {
generic_alloctable, generic_freetable,
graphnode_allocentry, component_freeentry
};
static PLHashNumber hash_serial(const void *key)
{
return (PLHashNumber) key;
}
tmreader *tmreader_new(const char *program, void *data)
{
tmreader *tmr;
tmr = calloc(1, sizeof *tmr);
if (!tmr)
return NULL;
tmr->program = program;
tmr->data = data;
PL_INIT_ARENA_POOL(&tmr->arena, "TMReader", 256*1024);
tmr->libraries = PL_NewHashTable(100, hash_serial, PL_CompareValues,
PL_CompareStrings, &graphnode_hashallocops,
&tmr->arena);
tmr->filenames = PL_NewHashTable(100, hash_serial, PL_CompareValues,
PL_CompareStrings, &filename_hashallocops,
&tmr->arena);
tmr->components = PL_NewHashTable(10000, PL_HashString, PL_CompareStrings,
PL_CompareValues, &component_hashallocops,
&tmr->arena);
tmr->methods = PL_NewHashTable(10000, hash_serial, PL_CompareValues,
PL_CompareStrings, &method_hashallocops,
&tmr->arena);
tmr->callsites = PL_NewHashTable(200000, hash_serial, PL_CompareValues,
PL_CompareValues, &callsite_hashallocops,
&tmr->arena);
tmr->calltree_root.entry.value = (void*) strdup("root");
if (!tmr->libraries || !tmr->components || !tmr->methods ||
!tmr->callsites || !tmr->calltree_root.entry.value ||
!tmr->filenames) {
tmreader_destroy(tmr);
return NULL;
}
return tmr;
}
void tmreader_destroy(tmreader *tmr)
{
if (tmr->libraries)
PL_HashTableDestroy(tmr->libraries);
if (tmr->filenames)
PL_HashTableDestroy(tmr->filenames);
if (tmr->components)
PL_HashTableDestroy(tmr->components);
if (tmr->methods)
PL_HashTableDestroy(tmr->methods);
if (tmr->callsites)
PL_HashTableDestroy(tmr->callsites);
PL_FinishArenaPool(&tmr->arena);
free(tmr);
}
int tmreader_eventloop(tmreader *tmr, const char *filename,
tmeventhandler eventhandler)
{
FILE *fp;
char buf[NS_TRACE_MALLOC_MAGIC_SIZE];
tmevent event;
static const char magic[] = NS_TRACE_MALLOC_MAGIC;
if (strcmp(filename, "-") == 0) {
fp = stdin;
} else {
#if defined(XP_WIN32)
fp = fopen(filename, "rb");
#else
fp = fopen(filename, "r");
#endif
if (!fp) {
fprintf(stderr, "%s: can't open %s: %s.\n",
tmr->program, filename, strerror(errno));
return 0;
}
}
if (read(fileno(fp), buf, sizeof buf) != sizeof buf ||
strncmp(buf, magic, sizeof buf) != 0) {
fprintf(stderr, "%s: bad magic string %s at start of %s.\n",
tmr->program, buf, filename);
fprintf(stderr, "either the data file is out of date,\nor your tools are out of date.\n");
return 0;
}
/* Read in ticks per second. Used to convert platform specific intervals to time values */
if (read(fileno(fp), &tmr->ticksPerSec, sizeof tmr->ticksPerSec) != sizeof tmr->ticksPerSec) {
fprintf(stderr, "%s: Cannot read ticksPerSec. Log file read error.\n",
tmr->program);
return 0;
}
tmr->ticksPerSec = PR_ntohl(tmr->ticksPerSec);
#ifdef DEBUG_dp
printf("DEBUG: ticks per sec = %d\n", tmr->ticksPerSec);
#endif
while (get_tmevent(fp, &event)) {
switch (event.type) {
case TM_EVENT_LIBRARY: {
const void *key;
PLHashNumber hash;
PLHashEntry **hep, *he;
key = (const void*) event.serial;
hash = hash_serial(key);
hep = PL_HashTableRawLookup(tmr->libraries, hash, key);
he = *hep;
PR_ASSERT(!he);
if (he) exit(2);
he = PL_HashTableRawAdd(tmr->libraries, hep, hash, key,
event.u.libname);
if (!he) {
perror(tmr->program);
return -1;
}
break;
}
case TM_EVENT_FILENAME: {
const void *key;
PLHashNumber hash;
PLHashEntry **hep, *he;
key = (const void*) event.serial;
hash = hash_serial(key);
hep = PL_HashTableRawLookup(tmr->filenames, hash, key);
he = *hep;
PR_ASSERT(!he);
if (he) exit(2);
he = PL_HashTableRawAdd(tmr->filenames, hep, hash, key,
event.u.srcname);
if (!he) {
perror(tmr->program);
return -1;
}
break;
}
case TM_EVENT_METHOD: {
const void *key, *sourcekey;
PLHashNumber hash, sourcehash;
PLHashEntry **hep, *he, **sourcehep, *sourcehe;
char *name, *head, *mark, save;
tmgraphnode *comp, *lib;
tmmethodnode *meth;
key = (const void*) event.serial;
hash = hash_serial(key);
hep = PL_HashTableRawLookup(tmr->methods, hash, key);
he = *hep;
PR_ASSERT(!he);
if (he) exit(2);
name = event.u.method.name;
he = PL_HashTableRawAdd(tmr->methods, hep, hash, key, name);
if (!he) {
perror(tmr->program);
return -1;
}
meth = (tmmethodnode*) he;
meth->linenumber = event.u.method.linenumber;
sourcekey = (const void*)event.u.method.filename;
sourcehash = hash_serial(sourcekey);
sourcehep = PL_HashTableRawLookup(tmr->filenames, sourcehash, sourcekey);
sourcehe = *sourcehep;
meth->sourcefile = filename_name(sourcehe);
head = name;
mark = strchr(name, ':');
if (!mark) {
mark = name;
while (*mark != '\0' && *mark == '_')
mark++;
head = mark;
mark = strchr(head, '_');
if (!mark) {
mark = strchr(head, '+');
if (!mark)
mark = head + strlen(head);
}
}
save = *mark;
*mark = '\0';
hash = PL_HashString(head);
hep = PL_HashTableRawLookup(tmr->components, hash, head);
he = *hep;
if (he) {
comp = (tmgraphnode*) he;
} else {
head = strdup(head);
if (head) {
he = PL_HashTableRawAdd(tmr->components, hep, hash, head,
head);
}
if (!he) {
perror(tmr->program);
return -1;
}
comp = (tmgraphnode*) he;
key = (const void*) event.u.method.library;
hash = hash_serial(key);
lib = (tmgraphnode*)
*PL_HashTableRawLookup(tmr->libraries, hash, key);
if (lib) {
comp->up = lib;
comp->next = lib->down;
lib->down = comp;
}
}
*mark = save;
meth->graphnode.up = comp;
meth->graphnode.next = comp->down;
comp->down = &(meth->graphnode);
break;
}
case TM_EVENT_CALLSITE: {
const void *key, *mkey;
PLHashNumber hash, mhash;
PLHashEntry **hep, *he;
tmcallsite *site, *parent;
tmmethodnode *meth;
key = (const void*) event.serial;
hash = hash_serial(key);
hep = PL_HashTableRawLookup(tmr->callsites, hash, key);
he = *hep;
PR_ASSERT(!he);
if (he) exit(2);
if (event.u.site.parent == 0) {
parent = &tmr->calltree_root;
} else {
parent = tmreader_callsite(tmr, event.u.site.parent);
if (!parent) {
fprintf(stderr, "%s: no parent for %lu (%lu)!\n",
tmr->program, (unsigned long) event.serial,
(unsigned long) event.u.site.parent);
continue;
}
}
he = PL_HashTableRawAdd(tmr->callsites, hep, hash, key, NULL);
if (!he) {
perror(tmr->program);
return -1;
}
site = (tmcallsite*) he;
site->parent = parent;
site->siblings = parent->kids;
parent->kids = site;
site->kids = NULL;
mkey = (const void*) event.u.site.method;
mhash = hash_serial(mkey);
meth = (tmmethodnode*)
*PL_HashTableRawLookup(tmr->methods, mhash, mkey);
site->method = meth;
site->offset = event.u.site.offset;
site->allocs.bytes.direct = site->allocs.bytes.total = 0;
site->allocs.calls.direct = site->allocs.calls.total = 0;
site->frees.bytes.direct = site->frees.bytes.total = 0;
site->frees.calls.direct = site->frees.calls.total = 0;
break;
}
case TM_EVENT_MALLOC:
case TM_EVENT_CALLOC:
case TM_EVENT_REALLOC: {
tmcallsite *site;
uint32 size, oldsize;
double delta, sqdelta, sqszdelta;
tmgraphnode *comp, *lib;
tmmethodnode *meth;
site = tmreader_callsite(tmr, event.serial);
if (!site) {
fprintf(stderr, "%s: no callsite for '%c' (%lu)!\n",
tmr->program, event.type, (unsigned long) event.serial);
continue;
}
size = event.u.alloc.size;
oldsize = event.u.alloc.oldsize;
delta = (double)size - (double)oldsize;
site->allocs.bytes.direct += (unsigned long)delta;
if (event.type != TM_EVENT_REALLOC)
site->allocs.calls.direct++;
meth = site->method;
if (meth) {
meth->graphnode.allocs.bytes.direct += (unsigned long)delta;
sqdelta = delta * delta;
if (event.type == TM_EVENT_REALLOC) {
sqszdelta = ((double)size * size)
- ((double)oldsize * oldsize);
meth->graphnode.sqsum += sqszdelta;
} else {
meth->graphnode.sqsum += sqdelta;
meth->graphnode.allocs.calls.direct++;
}
comp = meth->graphnode.up;
if (comp) {
comp->allocs.bytes.direct += (unsigned long)delta;
if (event.type == TM_EVENT_REALLOC) {
comp->sqsum += sqszdelta;
} else {
comp->sqsum += sqdelta;
comp->allocs.calls.direct++;
}
lib = comp->up;
if (lib) {
lib->allocs.bytes.direct += (unsigned long)delta;
if (event.type == TM_EVENT_REALLOC) {
lib->sqsum += sqszdelta;
} else {
lib->sqsum += sqdelta;
lib->allocs.calls.direct++;
}
}
}
}
break;
}
case TM_EVENT_FREE: {
tmcallsite *site;
uint32 size;
tmgraphnode *comp, *lib;
tmmethodnode *meth;
site = tmreader_callsite(tmr, event.serial);
if (!site) {
fprintf(stderr, "%s: no callsite for '%c' (%lu)!\n",
tmr->program, event.type, (unsigned long) event.serial);
continue;
}
size = event.u.alloc.size;
site->frees.bytes.direct += size;
site->frees.calls.direct++;
meth = site->method;
if (meth) {
meth->graphnode.frees.bytes.direct += size;
meth->graphnode.frees.calls.direct++;
comp = meth->graphnode.up;
if (comp) {
comp->frees.bytes.direct += size;
comp->frees.calls.direct++;
lib = comp->up;
if (lib) {
lib->frees.bytes.direct += size;
lib->frees.calls.direct++;
}
}
}
break;
}
case TM_EVENT_STATS:
break;
}
eventhandler(tmr, &event);
}
return 1;
}
tmgraphnode *tmreader_library(tmreader *tmr, uint32 serial)
{
const void *key;
PLHashNumber hash;
key = (const void*) serial;
hash = hash_serial(key);
return (tmgraphnode*) *PL_HashTableRawLookup(tmr->libraries, hash, key);
}
tmgraphnode *tmreader_filename(tmreader *tmr, uint32 serial)
{
const void *key;
PLHashNumber hash;
key = (const void*) serial;
hash = hash_serial(key);
return (tmgraphnode*) *PL_HashTableRawLookup(tmr->filenames, hash, key);
}
tmgraphnode *tmreader_component(tmreader *tmr, const char *name)
{
PLHashNumber hash;
hash = PL_HashString(name);
return (tmgraphnode*) *PL_HashTableRawLookup(tmr->components, hash, name);
}
tmmethodnode *tmreader_method(tmreader *tmr, uint32 serial)
{
const void *key;
PLHashNumber hash;
key = (const void*) serial;
hash = hash_serial(key);
return (tmmethodnode*) *PL_HashTableRawLookup(tmr->methods, hash, key);
}
tmcallsite *tmreader_callsite(tmreader *tmr, uint32 serial)
{
const void *key;
PLHashNumber hash;
key = (const void*) serial;
hash = hash_serial(key);
return (tmcallsite*) *PL_HashTableRawLookup(tmr->callsites, hash, key);
}
int tmgraphnode_connect(tmgraphnode *from, tmgraphnode *to, tmcallsite *site)
{
tmgraphlink *outlink;
tmgraphedge *edge;
for (outlink = from->out; outlink; outlink = outlink->next) {
if (outlink->node == to) {
/*
* Say the stack looks like this: ... => JS => js => JS => js.
* We must avoid overcounting JS=>js because the first edge total
* includes the second JS=>js edge's total (which is because the
* lower site's total includes all its kids' totals).
*/
edge = TM_LINK_TO_EDGE(outlink, TM_EDGE_OUT_LINK);
if (!to->low || to->low < from->low) {
/* Add the direct and total counts to edge->allocs. */
edge->allocs.bytes.direct += site->allocs.bytes.direct;
edge->allocs.bytes.total += site->allocs.bytes.total;
edge->allocs.calls.direct += site->allocs.calls.direct;
edge->allocs.calls.total += site->allocs.calls.total;
/* Now update the free counts. */
edge->frees.bytes.direct += site->frees.bytes.direct;
edge->frees.bytes.total += site->frees.bytes.total;
edge->frees.calls.direct += site->frees.calls.direct;
edge->frees.calls.total += site->frees.calls.total;
}
return 1;
}
}
edge = (tmgraphedge*) malloc(sizeof(tmgraphedge));
if (!edge)
return 0;
edge->links[TM_EDGE_OUT_LINK].node = to;
edge->links[TM_EDGE_OUT_LINK].next = from->out;
from->out = &edge->links[TM_EDGE_OUT_LINK];
edge->links[TM_EDGE_IN_LINK].node = from;
edge->links[TM_EDGE_IN_LINK].next = to->in;
to->in = &edge->links[TM_EDGE_IN_LINK];
edge->allocs = site->allocs;
edge->frees = site->frees;
return 1;
}
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