cg->treeContext.tryCount = 0;
js_AllocTryNotes(JSContext *cx, JSCodeGenerator *cg){    size_t size;    size = (cg->treeContext.tryCount + 1) * sizeof(JSTryNote);    PR_ARENA_ALLOCATE(cg->tryBase, &cx->tempPool, size);    if (!cg->tryBase)	return JS_FALSE;    cg->tryNext = cg->tryBase;    cg->tryLimit = (JSTryNote *)((char *)cg->tryBase + size);    return JS_TRUE;}