Bug 1333143 - Self-host Object.prototype.valueOf. r=till

js/src/builtin/Object.cpp

@@ -419,18 +419,6 @@ js::obj_toString(JSContext* cx, unsigned argc, Value* vp)
     return true;
 }
 
-
-bool
-js::obj_valueOf(JSContext* cx, unsigned argc, Value* vp)
-{
-    CallArgs args = CallArgsFromVp(argc, vp);
-    RootedObject obj(cx, ToObject(cx, args.thisv()));
-    if (!obj)
-        return false;
-    args.rval().setObject(*obj);
-    return true;
-}
-
 static bool
 obj_setPrototypeOf(JSContext* cx, unsigned argc, Value* vp)
 {
@@ -1195,7 +1183,7 @@ static const JSFunctionSpec object_methods[] = {
 #endif
     JS_FN(js_toString_str,             obj_toString,                0,0),
     JS_SELF_HOSTED_FN(js_toLocaleString_str, "Object_toLocaleString", 0, 0),
-    JS_FN(js_valueOf_str,              obj_valueOf,                 0,0),
+    JS_SELF_HOSTED_FN(js_valueOf_str,  "Object_valueOf",            0,0),
 #if JS_HAS_OBJ_WATCHPOINT
     JS_FN(js_watch_str,                obj_watch,                   2,0),
     JS_FN(js_unwatch_str,              obj_unwatch,                 1,0),

js/src/builtin/Object.h

@@ -25,9 +25,6 @@ obj_construct(JSContext* cx, unsigned argc, JS::Value* vp);
 MOZ_MUST_USE bool
 obj_propertyIsEnumerable(JSContext* cx, unsigned argc, Value* vp);
 
-MOZ_MUST_USE bool
-obj_valueOf(JSContext* cx, unsigned argc, JS::Value* vp);
-
 PlainObject*
 ObjectCreateImpl(JSContext* cx, HandleObject proto, NewObjectKind newKind = GenericObject,
                  HandleObjectGroup group = nullptr);

js/src/builtin/Object.js

@@ -87,6 +87,12 @@ function Object_toLocaleString() {
     return callContentFunction(O.toString, O);
 }
 
+// ES 2017 draft bb96899bb0d9ef9be08164a26efae2ee5f25e875 19.1.3.7
+function Object_valueOf() {
+    // Step 1.
+    return ToObject(this);
+}
+
 // ES7 draft (2016 March 8) B.2.2.3
 function ObjectDefineSetter(name, setter) {
     // Step 1.

js/src/jit-test/tests/basic/bug713226.js

@@ -8,7 +8,7 @@ function addDebug(g, id) {\
     var debuggerGlobal = newGlobal();\
     debuggerGlobal.debuggee = g;\
     debuggerGlobal.id = id;\
-    debuggerGlobal.print = function (s) { (g) += s; };\
+    debuggerGlobal.print = function (s) { print(s); };\
     debuggerGlobal.eval('var dbg = new Debugger(debuggee);dbg.onDebuggerStatement = function () { print(id); debugger; };');\
     return debuggerGlobal;\
 }\

js/src/jit-test/tests/profiler/AutoEntryMonitor-01.js

@@ -31,7 +31,7 @@ cold_and_warm(Object.prototype.toString, { ToString: {} }, []);
 var toS = { toString: function myToString() { return "string"; } };
 cold_and_warm(toS.toString, { ToString: toS }, [ "myToString" ]);
 
-cold_and_warm(undefined, { ToNumber: {} }, []);
+cold_and_warm(undefined, { ToNumber: 5 }, []);
 
 var vOf = { valueOf: function myValueOf() { return 42; } };
 cold_and_warm(vOf.valueOf, { ToNumber: vOf }, [ "myValueOf" ]);

js/src/vm/CommonPropertyNames.h

@@ -243,6 +243,7 @@
     macro(other, other, "other") \
     macro(outOfMemory, outOfMemory, "out of memory") \
     macro(ownKeys, ownKeys, "ownKeys") \
+    macro(Object_valueOf, Object_valueOf, "Object_valueOf") \
     macro(parseFloat, parseFloat, "parseFloat") \
     macro(parseInt, parseInt, "parseInt") \
     macro(pattern, pattern, "pattern") \

js/src/wasm/AsmJS.cpp

@@ -34,6 +34,7 @@
 #include "frontend/Parser.h"
 #include "gc/Policy.h"
 #include "js/MemoryMetrics.h"
+#include "vm/SelfHosting.h"
 #include "vm/StringBuffer.h"
 #include "vm/Time.h"
 #include "vm/TypedArrayObject.h"
@@ -7449,6 +7450,20 @@ GetDataProperty(JSContext* cx, HandleValue objVal, ImmutablePropertyNamePtr fiel
     return GetDataProperty(cx, objVal, fieldHandle, v);
 }
 
+static bool
+HasObjectValueOfMethodPure(JSObject* obj, JSContext* cx)
+{
+    Value v;
+    if (!GetPropertyPure(cx, obj, NameToId(cx->names().valueOf), &v))
+        return false;
+
+    JSFunction* fun;
+    if (!IsFunctionObject(v, &fun))
+        return false;
+
+    return IsSelfHostedFunctionWithName(fun, cx->names().Object_valueOf);
+}
+
 static bool
 HasPureCoercion(JSContext* cx, HandleValue v)
 {
@@ -7465,7 +7480,7 @@ HasPureCoercion(JSContext* cx, HandleValue v)
     // most apps have been built with newer Emscripten.
     if (v.toObject().is<JSFunction>() &&
         HasNoToPrimitiveMethodPure(&v.toObject(), cx) &&
-        HasNativeMethodPure(&v.toObject(), cx->names().valueOf, obj_valueOf, cx) &&
+        HasObjectValueOfMethodPure(&v.toObject(), cx) &&
         HasNativeMethodPure(&v.toObject(), cx->names().toString, fun_toString, cx))
     {
         return true;