[API] GetOwnPropertyDescriptor: use C++ implementation

src/js/proxy.js

Index: src/js/proxy.js
diff --git a/src/js/proxy.js b/src/js/proxy.js
index 088dbe8d95da4f57920d8b89285f4f29fcadbbc1..c4414a23f4903ecc3692a9aef1178e68d7b61770 100644
--- a/src/js/proxy.js
+++ b/src/js/proxy.js
@@ -12,8 +12,6 @@
 // Imports
 //
 var GlobalProxy = global.Proxy;
-var GlobalFunction = global.Function;
-var GlobalObject = global.Object;
 var MakeTypeError;
 
 utils.Import(function(from) {
@@ -30,75 +28,6 @@ function ProxyCreateRevocable(target, handler) {
 // -------------------------------------------------------------------
 // Proxy Builtins
 
-function DerivedConstructTrap(callTrap) {
-  return function() {
-    var proto = this.prototype
-    if (!IS_SPEC_OBJECT(proto)) proto = GlobalObject.prototype
-    var obj = { __proto__: proto };
-    var result = %Apply(callTrap, obj, arguments, 0, %_ArgumentsLength());
-    return IS_SPEC_OBJECT(result) ? result : obj
-  }
-}
-
-function DelegateCallAndConstruct(callTrap, constructTrap) {
-  return function() {
-    return %Apply(IS_UNDEFINED(new.target) ? callTrap : constructTrap,
-                  this, arguments, 0, %_ArgumentsLength())
-  }
-}
-
-function DerivedSetTrap(receiver, name, val) {
-  var desc = this.getOwnPropertyDescriptor(name)
-  if (desc) {
-    if ('writable' in desc) {
-      if (desc.writable) {
-        desc.value = val
-        this.defineProperty(name, desc)
-        return true
-      } else {
-        return false
-      }
-    } else { // accessor
-      if (desc.set) {
-        // The proposal says: desc.set.call(receiver, val)
-        %_Call(desc.set, receiver, val)
-        return true
-      } else {
-        return false
-      }
-    }
-  }
-  desc = this.getPropertyDescriptor(name)
-  if (desc) {
-    if ('writable' in desc) {
-      if (desc.writable) {
-        // fall through
-      } else {
-        return false
-      }
-    } else { // accessor
-      if (desc.set) {
-        // The proposal says: desc.set.call(receiver, val)
-        %_Call(desc.set, receiver, val)
-        return true
-      } else {
-        return false
-      }
-    }
-  }
-  this.defineProperty(name, {
-    value: val,
-    writable: true,
-    enumerable: true,
-    configurable: true});
-  return true;
-}
-
-function DerivedHasOwnTrap(name) {
-  return !!this.getOwnPropertyDescriptor(name)
-}
-
-
 // Implements part of ES6 9.5.11 Proxy.[[Enumerate]]:
 // Call the trap, which should return an iterator, exhaust the iterator,
 // and return an array containing the values.
@@ -135,11 +64,6 @@ utils.InstallFunctions(GlobalProxy, DONT_ENUM, [
 // -------------------------------------------------------------------
 // Exports
 
-utils.Export(function(to) {
-  to.ProxyDelegateCallAndConstruct = DelegateCallAndConstruct;
-  to.ProxyDerivedHasOwnTrap = DerivedHasOwnTrap;
-});
-
 %InstallToContext([
   "proxy_enumerate", ProxyEnumerate,
 ]);