Bug 456165. Trace |new Date()|. r=brendan

js/src/jsbuiltins.cpp

@@ -52,6 +52,7 @@
 #include "jsmath.h"
 #include "jsnum.h"
 #include "prmjtime.h"
+#include "jsdate.h"
 #include "jsscope.h"
 #include "jsstr.h"
 #include "jstracer.h"
@@ -875,6 +876,37 @@ js_Date_now(JSContext*)
     return PRMJ_Now() / PRMJ_USEC_PER_MSEC;
 }
 
+JS_STATIC_ASSERT(JSSLOT_PRIVATE == JSSLOT_UTC_TIME);
+JS_STATIC_ASSERT(JSSLOT_UTC_TIME + 1 == JSSLOT_LOCAL_TIME);
+
+JSObject* FASTCALL
+js_FastNewDate(JSContext* cx, JSObject* proto)
+{
+    JS_ASSERT(JS_ON_TRACE(cx));
+    JSObject* obj = (JSObject*) js_NewGCThing(cx, GCX_OBJECT, sizeof(JSObject));
+    if (!obj)
+        return NULL;
+
+    JSClass* clasp = &js_DateClass;
+    obj->classword = jsuword(clasp);
+
+    obj->fslots[JSSLOT_PROTO] = OBJECT_TO_JSVAL(proto);
+    obj->fslots[JSSLOT_PARENT] = proto->fslots[JSSLOT_PARENT];
+
+    jsdouble* date = js_NewWeaklyRootedDouble(cx, 0.0);
+    if (!date)
+        return NULL;
+    *date = js_Date_now(cx);
+    obj->fslots[JSSLOT_UTC_TIME] = DOUBLE_TO_JSVAL(date);
+    obj->fslots[JSSLOT_LOCAL_TIME] = DOUBLE_TO_JSVAL(cx->runtime->jsNaN);;
+
+    JS_ASSERT(!clasp->getObjectOps);
+    JS_ASSERT(proto->map->ops == &js_ObjectOps);
+    obj->map = js_HoldObjectMap(cx, proto->map);
+    obj->dslots = NULL;
+    return obj;    
+}
+
 /* soft float */
 
 jsdouble FASTCALL