[proxies] Improve error messages.

src/js/v8natives.js

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 (function(global, utils) {
 
 %CheckIsBootstrapping();
 
 // ----------------------------------------------------------------------------
 // Imports
@@ skipping 457 matching lines @@
 
   return desc;
 }
 
 
 // For Harmony proxies.
 function GetTrap(handler, name, defaultTrap) {
   var trap = handler[name];
   if (IS_UNDEFINED(trap)) {
     if (IS_UNDEFINED(defaultTrap)) {
-      throw MakeTypeError(kProxyHandlerTrapMissing, handler, name);
+      throw MakeTypeError(kIllegalInvocation);
     }
     trap = defaultTrap;
   } else if (!IS_CALLABLE(trap)) {
-    throw MakeTypeError(kProxyHandlerTrapMustBeCallable, handler, name);
+    throw MakeTypeError(kIllegalInvocation);
   }
   return trap;
 }
 
 
 function CallTrap1(handler, name, defaultTrap, x) {
   return %_Call(GetTrap(handler, name, defaultTrap), handler, x);
 }
 
 
@@ skipping 10 matching lines @@
   if (%_IsJSProxy(obj)) {
     // TODO(rossberg): adjust once there is a story for symbols vs proxies.
     if (IS_SYMBOL(v)) return UNDEFINED;
 
     var handler = %GetHandler(obj);
     var descriptor = CallTrap1(
                          handler, "getOwnPropertyDescriptor", UNDEFINED, p);
     if (IS_UNDEFINED(descriptor)) return descriptor;
     var desc = ToCompletePropertyDescriptor(descriptor);
     if (!desc.isConfigurable()) {
-      throw MakeTypeError(kProxyPropNotConfigurable,
-                          handler, p, "getOwnPropertyDescriptor");
+      throw MakeTypeError(kIllegalInvocation);
     }
     return desc;
   }
 
   // GetOwnProperty returns an array indexed by the constants
   // defined in macros.py.
   // If p is not a property on obj undefined is returned.
   var props = %GetOwnProperty_Legacy(TO_OBJECT(obj), p);
 
   return ConvertDescriptorArrayToDescriptor(props);
@@ skipping 11 matching lines @@
 
 // Harmony proxies.
 function DefineProxyProperty(obj, p, attributes, should_throw) {
   // TODO(rossberg): adjust once there is a story for symbols vs proxies.
   if (IS_SYMBOL(p)) return false;
 
   var handler = %GetHandler(obj);
   var result = CallTrap2(handler, "defineProperty", UNDEFINED, p, attributes);
   if (!result) {
     if (should_throw) {
-      throw MakeTypeError(kProxyTrapReturned,
-                          handler, "false", "defineProperty");
+      throw MakeTypeError(kIllegalInvocation);
     } else {
       return false;
     }
   }
   return true;
 }
 
 
 // ES6 9.1.6 [[DefineOwnProperty]](P, Desc)
 function DefineObjectProperty(obj, p, desc, should_throw) {
@@ skipping 217 matching lines @@
     return DefineObjectProperty(obj, p, desc, should_throw);
   }
 }
 
 
 // ES6 section 19.1.2.9
 function ObjectGetPrototypeOf(obj) {
   return %_GetPrototype(TO_OBJECT(obj));
 }
 
-// ES6 section 19.1.2.19.
+// ES6 section 19.1.2.18.
 function ObjectSetPrototypeOf(obj, proto) {
   CHECK_OBJECT_COERCIBLE(obj, "Object.setPrototypeOf");
 
   if (proto !== null && !IS_SPEC_OBJECT(proto)) {
     throw MakeTypeError(kProtoObjectOrNull, proto);
   }
 
   if (IS_SPEC_OBJECT(obj)) {
     %SetPrototype(obj, proto);
   }
@@ skipping 658 matching lines @@
   to.ObjectIsSealed = ObjectIsSealed;
   to.ObjectKeys = ObjectKeys;
 });
 
 %InstallToContext([
   "global_eval_fun", GlobalEval,
   "object_value_of", ObjectValueOf,
 ]);
 
 })