void
XPCRootSetElem::AddToRootSet(JSRuntime* rt, XPCRootSetElem** listHead)
{
NS_ASSERTION(!mSelfp, "Must be not linked");
JS_LOCK_GC(rt);
mSelfp = listHead;
mNext = *listHead;
if(mNext)
{
NS_ASSERTION(mNext->mSelfp == listHead, "Must be list start");
mNext->mSelfp = &mNext;
}
*listHead = this;
JS_UNLOCK_GC(rt);
}
void
XPCRootSetElem::RemoveFromRootSet(JSRuntime* rt)
{
NS_ASSERTION(mSelfp, "Must be linked");
JS_LOCK_GC(rt);
NS_ASSERTION(*mSelfp == this, "Link invariant");
*mSelfp = mNext;
if(mNext)
mNext->mSelfp = mSelfp;
JS_UNLOCK_GC(rt);
#ifdef DEBUG
mSelfp = nsnull;
mNext = nsnull;
#endif
}
JSContext *
js_ContextIterator(JSRuntime *rt, JSBool unlocked, JSContext **iterp)
{
JSContext *cx = *iterp;
if (unlocked)
JS_LOCK_GC(rt);
if (!cx)
cx = (JSContext *)&rt->contextList;
cx = (JSContext *)cx->links.next;
if (&cx->links == &rt->contextList)
cx = NULL;
*iterp = cx;
if (unlocked)
JS_UNLOCK_GC(rt);
return cx;
}
AutoLockJSGC(JSRuntime* rt) : mJSRuntime(rt) { JS_LOCK_GC(mJSRuntime); }
JSContext *
js_NewContext(JSRuntime *rt, size_t stackChunkSize)
{
JSContext *cx;
JSBool ok, first;
cx = (JSContext *) malloc(sizeof *cx);
if (!cx)
return NULL;
memset(cx, 0, sizeof *cx);
cx->runtime = rt;
#if JS_STACK_GROWTH_DIRECTION > 0
cx->stackLimit = (jsuword)-1;
#endif
#ifdef JS_THREADSAFE
js_InitContextForLocking(cx);
#endif
JS_LOCK_GC(rt);
for (;;) {
first = (rt->contextList.next == &rt->contextList);
if (rt->state == JSRTS_UP) {
JS_ASSERT(!first);
break;
}
if (rt->state == JSRTS_DOWN) {
JS_ASSERT(first);
rt->state = JSRTS_LAUNCHING;
break;
}
JS_WAIT_CONDVAR(rt->stateChange, JS_NO_TIMEOUT);
}
JS_APPEND_LINK(&cx->links, &rt->contextList);
JS_UNLOCK_GC(rt);
/*
* First we do the infallible, every-time per-context initializations.
* Should a later, fallible initialization (js_InitRegExpStatics, e.g.,
* or the stuff under 'if (first)' below) fail, at least the version
* and arena-pools will be valid and safe to use (say, from the last GC
* done by js_DestroyContext).
*/
cx->version = JSVERSION_DEFAULT;
cx->jsop_eq = JSOP_EQ;
cx->jsop_ne = JSOP_NE;
JS_InitArenaPool(&cx->stackPool, "stack", stackChunkSize, sizeof(jsval));
JS_InitArenaPool(&cx->tempPool, "temp", 1024, sizeof(jsdouble));
#if JS_HAS_REGEXPS
if (!js_InitRegExpStatics(cx, &cx->regExpStatics)) {
js_DestroyContext(cx, JS_NO_GC);
return NULL;
}
#endif
#if JS_HAS_EXCEPTIONS
cx->throwing = JS_FALSE;
#endif
/*
* If cx is the first context on this runtime, initialize well-known atoms,
* keywords, numbers, and strings. If one of these steps should fail, the
* runtime will be left in a partially initialized state, with zeroes and
* nulls stored in the default-initialized remainder of the struct. We'll
* clean the runtime up under js_DestroyContext, because cx will be "last"
* as well as "first".
*/
if (first) {
ok = (rt->atomState.liveAtoms == 0)
? js_InitAtomState(cx, &rt->atomState)
: js_InitPinnedAtoms(cx, &rt->atomState);
if (ok)
ok = js_InitScanner(cx);
if (ok)
ok = js_InitRuntimeNumberState(cx);
if (ok)
ok = js_InitRuntimeScriptState(cx);
if (ok)
ok = js_InitRuntimeStringState(cx);
if (!ok) {
js_DestroyContext(cx, JS_NO_GC);
return NULL;
}
JS_LOCK_GC(rt);
rt->state = JSRTS_UP;
JS_NOTIFY_ALL_CONDVAR(rt->stateChange);
JS_UNLOCK_GC(rt);
}
return cx;
}
void
js_DestroyContext(JSContext *cx, JSGCMode gcmode)
{
JSRuntime *rt;
JSBool last;
JSArgumentFormatMap *map;
JSLocalRootStack *lrs;
JSLocalRootChunk *lrc;
rt = cx->runtime;
/* Remove cx from context list first. */
JS_LOCK_GC(rt);
JS_ASSERT(rt->state == JSRTS_UP || rt->state == JSRTS_LAUNCHING);
JS_REMOVE_LINK(&cx->links);
last = (rt->contextList.next == &rt->contextList);
if (last)
rt->state = JSRTS_LANDING;
JS_UNLOCK_GC(rt);
if (last) {
#ifdef JS_THREADSAFE
/*
* If cx is not in a request already, begin one now so that we wait
* for any racing GC started on a not-last context to finish, before
* we plow ahead and unpin atoms. Note that even though we begin a
* request here if necessary, we end all requests on cx below before
* forcing a final GC. This lets any not-last context destruction
* racing in another thread try to force or maybe run the GC, but by
* that point, rt->state will not be JSRTS_UP, and that GC attempt
* will return early.
*/
if (cx->requestDepth == 0)
JS_BeginRequest(cx);
#endif
/* Unpin all pinned atoms before final GC. */
js_UnpinPinnedAtoms(&rt->atomState);
/* Unlock and clear GC things held by runtime pointers. */
js_FinishRuntimeNumberState(cx);
js_FinishRuntimeStringState(cx);
/* Clear debugging state to remove GC roots. */
JS_ClearAllTraps(cx);
JS_ClearAllWatchPoints(cx);
}
#if JS_HAS_REGEXPS
/*
* Remove more GC roots in regExpStatics, then collect garbage.
* XXX anti-modularity alert: we rely on the call to js_RemoveRoot within
* XXX this function call to wait for any racing GC to complete, in the
* XXX case where JS_DestroyContext is called outside of a request on cx
*/
js_FreeRegExpStatics(cx, &cx->regExpStatics);
#endif
#ifdef JS_THREADSAFE
/*
* Destroying a context implicitly calls JS_EndRequest(). Also, we must
* end our request here in case we are "last" -- in that event, another
* js_DestroyContext that was not last might be waiting in the GC for our
* request to end. We'll let it run below, just before we do the truly
* final GC and then free atom state.
*
* At this point, cx must be inaccessible to other threads. It's off the
* rt->contextList, and it should not be reachable via any object private
* data structure.
*/
while (cx->requestDepth != 0)
JS_EndRequest(cx);
#endif
if (last) {
/* Always force, so we wait for any racing GC to finish. */
js_ForceGC(cx, GC_LAST_CONTEXT);
/* Iterate until no finalizer removes a GC root or lock. */
while (rt->gcPoke)
js_GC(cx, GC_LAST_CONTEXT);
/* Try to free atom state, now that no unrooted scripts survive. */
if (rt->atomState.liveAtoms == 0)
js_FreeAtomState(cx, &rt->atomState);
/* Now after the last GC can we free the script filename table. */
js_FinishRuntimeScriptState(cx);
/* Take the runtime down, now that it has no contexts or atoms. */
JS_LOCK_GC(rt);
rt->state = JSRTS_DOWN;
JS_NOTIFY_ALL_CONDVAR(rt->stateChange);
JS_UNLOCK_GC(rt);
} else {
if (gcmode == JS_FORCE_GC)
js_ForceGC(cx, 0);
else if (gcmode == JS_MAYBE_GC)
JS_MaybeGC(cx);
}
/* Free the stuff hanging off of cx. */
JS_FinishArenaPool(&cx->stackPool);
JS_FinishArenaPool(&cx->tempPool);
if (cx->lastMessage)
free(cx->lastMessage);
/* Remove any argument formatters. */
map = cx->argumentFormatMap;
while (map) {
JSArgumentFormatMap *temp = map;
map = map->next;
JS_free(cx, temp);
}
/* Destroy the resolve recursion damper. */
if (cx->resolvingTable) {
JS_DHashTableDestroy(cx->resolvingTable);
cx->resolvingTable = NULL;
}
lrs = cx->localRootStack;
if (lrs) {
while ((lrc = lrs->topChunk) != &lrs->firstChunk) {
lrs->topChunk = lrc->down;
JS_free(cx, lrc);
}
JS_free(cx, lrs);
}
/* Destroy the lint information */
if (cx->lint) {
JS_free(cx, cx->lint);
}
/* Finally, free cx itself. */
free(cx);
}
JSContext *
js_NewContext(JSRuntime *rt, size_t stackChunkSize)
{
JSContext *cx;
JSBool ok, first;
JSContextCallback cxCallback;
cx = (JSContext *) malloc(sizeof *cx);
if (!cx)
return NULL;
memset(cx, 0, sizeof *cx);
cx->runtime = rt;
JS_ClearOperationCallback(cx);
cx->debugHooks = &rt->globalDebugHooks;
#if JS_STACK_GROWTH_DIRECTION > 0
cx->stackLimit = (jsuword)-1;
#endif
cx->scriptStackQuota = JS_DEFAULT_SCRIPT_STACK_QUOTA;
#ifdef JS_THREADSAFE
JS_INIT_CLIST(&cx->threadLinks);
js_SetContextThread(cx);
#endif
JS_LOCK_GC(rt);
for (;;) {
first = (rt->contextList.next == &rt->contextList);
if (rt->state == JSRTS_UP) {
JS_ASSERT(!first);
break;
}
if (rt->state == JSRTS_DOWN) {
JS_ASSERT(first);
rt->state = JSRTS_LAUNCHING;
break;
}
JS_WAIT_CONDVAR(rt->stateChange, JS_NO_TIMEOUT);
}
JS_APPEND_LINK(&cx->links, &rt->contextList);
JS_UNLOCK_GC(rt);
/*
* First we do the infallible, every-time per-context initializations.
* Should a later, fallible initialization (js_InitRegExpStatics, e.g.,
* or the stuff under 'if (first)' below) fail, at least the version
* and arena-pools will be valid and safe to use (say, from the last GC
* done by js_DestroyContext).
*/
cx->version = JSVERSION_DEFAULT;
JS_INIT_ARENA_POOL(&cx->stackPool, "stack", stackChunkSize, sizeof(jsval),
&cx->scriptStackQuota);
JS_INIT_ARENA_POOL(&cx->tempPool, "temp", 1024, sizeof(jsdouble),
&cx->scriptStackQuota);
if (!js_InitRegExpStatics(cx, &cx->regExpStatics)) {
js_DestroyContext(cx, JSDCM_NEW_FAILED);
return NULL;
}
/*
* If cx is the first context on this runtime, initialize well-known atoms,
* keywords, numbers, and strings. If one of these steps should fail, the
* runtime will be left in a partially initialized state, with zeroes and
* nulls stored in the default-initialized remainder of the struct. We'll
* clean the runtime up under js_DestroyContext, because cx will be "last"
* as well as "first".
*/
if (first) {
#ifdef JS_THREADSAFE
JS_BeginRequest(cx);
#endif
ok = js_InitCommonAtoms(cx);
/*
* scriptFilenameTable may be left over from a previous episode of
* non-zero contexts alive in rt, so don't re-init the table if it's
* not necessary.
*/
if (ok && !rt->scriptFilenameTable)
ok = js_InitRuntimeScriptState(rt);
if (ok)
ok = js_InitRuntimeNumberState(cx);
if (ok)
ok = js_InitRuntimeStringState(cx);
#ifdef JS_THREADSAFE
JS_EndRequest(cx);
#endif
if (!ok) {
js_DestroyContext(cx, JSDCM_NEW_FAILED);
return NULL;
}
JS_LOCK_GC(rt);
rt->state = JSRTS_UP;
JS_NOTIFY_ALL_CONDVAR(rt->stateChange);
JS_UNLOCK_GC(rt);
}
cxCallback = rt->cxCallback;
if (cxCallback && !cxCallback(cx, JSCONTEXT_NEW)) {
js_DestroyContext(cx, JSDCM_NEW_FAILED);
return NULL;
}
return cx;
}
