v8: handle proxy objects in MakeMirror(), v2

PR-URL: #14343
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

Author: bnoordhuis

Diff for: deps/v8/include/v8-version.h

@@ -11,7 +11,7 @@
 #define V8_MAJOR_VERSION 5
 #define V8_MINOR_VERSION 1
 #define V8_BUILD_NUMBER 281
-#define V8_PATCH_LEVEL 106
+#define V8_PATCH_LEVEL 107
 
 // Use 1 for candidates and 0 otherwise.
 // (Boolean macro values are not supported by all preprocessors.)

Diff for: deps/v8/src/debug/debug.js

@@ -864,6 +864,7 @@ Debug.debuggerFlags = function() {
 };
 
 Debug.MakeMirror = MakeMirror;
+Debug.MakeMirrorSerializer = MakeMirrorSerializer;
 
 function MakeExecutionState(break_id) {
   return new ExecutionState(break_id);

Diff for: deps/v8/src/debug/mirrors.js

@@ -60,6 +60,7 @@ utils.Import(function(from) {
 //   - FrameMirror
 //   - ScriptMirror
 //   - ScopeMirror
+//   - ProxyMirror
 
 // Type names of the different mirrors.
 var MirrorType = {
@@ -84,6 +85,7 @@ var MirrorType = {
   SET_TYPE : 'set',
   ITERATOR_TYPE : 'iterator',
   GENERATOR_TYPE : 'generator',
+  PROXY_TYPE : 'proxy',
 }
 
 
@@ -157,6 +159,8 @@ function MakeMirror(value, opt_transient) {
     mirror = new StringMirror(value);
   } else if (IS_SYMBOL(value)) {
     mirror = new SymbolMirror(value);
+  } else if (IS_PROXY(value)) {
+    mirror = new ProxyMirror(value);
   } else if (IS_ARRAY(value)) {
     mirror = new ArrayMirror(value);
   } else if (IS_DATE(value)) {
@@ -342,6 +346,15 @@ Mirror.prototype.isSymbol = function() {
 };
 
 
+/**
+ * Check whether the mirror reflects a proxy object.
+ * @returns {boolean} True if the mirror reflects a proxy object.
+ */
+Mirror.prototype.isProxy = function() {
+  return this instanceof ProxyMirror;
+};
+
+
 /**
  * Check whether the mirror reflects an object.
  * @returns {boolean} True if the mirror reflects an object
@@ -2439,6 +2452,29 @@ ContextMirror.prototype.data = function() {
 };
 
 
+/**
+ * Mirror object for proxies.
+ * @param {value} value The value reflected by this mirror.
+ * @constructor
+ * @extends Mirror
+ */
+function ProxyMirror(value) {
+  %_Call(Mirror, this, MirrorType.PROXY_TYPE);
+  this.value_ = value;
+}
+inherits(ProxyMirror, Mirror);
+
+
+ProxyMirror.prototype.value = function() {
+  return this.value_;
+};
+
+
+ProxyMirror.prototype.toText = function() {
+  return '#<Proxy>';
+};
+
+
 /**
  * Returns a mirror serializer
  *

Diff for: deps/v8/src/runtime/runtime-debug.cc

@@ -310,7 +310,6 @@ RUNTIME_FUNCTION(Runtime_DebugGetPropertyDetails) {
 
   DCHECK(args.length() == 2);
 
-  if (args[0]->IsJSProxy()) return isolate->heap()->undefined_value();
   CONVERT_ARG_HANDLE_CHECKED(JSObject, obj, 0);
   CONVERT_ARG_HANDLE_CHECKED(Name, name, 1);
 
@@ -383,7 +382,6 @@ RUNTIME_FUNCTION(Runtime_DebugGetProperty) {
 
   DCHECK(args.length() == 2);
 
-  if (args[0]->IsJSProxy()) return isolate->heap()->undefined_value();
   CONVERT_ARG_HANDLE_CHECKED(JSObject, obj, 0);
   CONVERT_ARG_HANDLE_CHECKED(Name, name, 1);
 
@@ -1320,7 +1318,6 @@ static bool HasInPrototypeChainIgnoringProxies(Isolate* isolate,
 RUNTIME_FUNCTION(Runtime_DebugReferencedBy) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 3);
-  if (!args[0]->IsJSObject()) return *isolate->factory()->NewJSArray(0);
   CONVERT_ARG_HANDLE_CHECKED(JSObject, target, 0);
   CONVERT_ARG_HANDLE_CHECKED(Object, filter, 1);
   RUNTIME_ASSERT(filter->IsUndefined() || filter->IsJSObject());
@@ -1411,7 +1408,6 @@ RUNTIME_FUNCTION(Runtime_DebugConstructedBy) {
 RUNTIME_FUNCTION(Runtime_DebugGetPrototype) {
   HandleScope shs(isolate);
   DCHECK(args.length() == 1);
-  if (args[0]->IsJSProxy()) return isolate->heap()->undefined_value();
   CONVERT_ARG_HANDLE_CHECKED(JSObject, obj, 0);
   Handle<Object> prototype;
   // TODO(1543): Come up with a solution for clients to handle potential errors

Diff for: test/parallel/test-debug-mirror-proxy.js

@@ -4,27 +4,16 @@ require('../common');
 const assert = require('assert');
 const vm = require('vm');
 
-const { MakeMirror } = vm.runInDebugContext('Debug');
+const { MakeMirror, MakeMirrorSerializer } = vm.runInDebugContext('Debug');
 const proxy = new Proxy({ x: 1, y: 2 }, { get: Reflect.get });
 const mirror = MakeMirror(proxy, /* transient */ true);
 
-assert.strictEqual(mirror.protoObject().value(), undefined);
-assert.strictEqual(mirror.className(), 'Object');
-assert.strictEqual(mirror.constructorFunction().value(), undefined);
-assert.strictEqual(mirror.prototypeObject().value(), undefined);
-assert.strictEqual(mirror.hasNamedInterceptor(), false);
-assert.strictEqual(mirror.hasIndexedInterceptor(), false);
-assert.strictEqual(mirror.referencedBy(1).length, 0);
-assert.strictEqual(mirror.toText(), '#<Object>');
+assert.strictEqual(mirror.isProxy(), true);
+assert.strictEqual(mirror.toText(), '#<Proxy>');
+assert.strictEqual(mirror.value(), proxy);
 
-const propertyNames = mirror.propertyNames();
-const DebugContextArray = propertyNames.constructor;
-assert.deepStrictEqual(propertyNames, DebugContextArray.from(['x', 'y']));
-
-const properties = mirror.properties();
-assert.strictEqual(properties.length, 2);
-// UndefinedMirror because V8 cannot retrieve the values without invoking
-// the handler.  Could be turned a PropertyMirror but mirror.value() would
-// still be an UndefinedMirror.  This seems Good Enough for now.
-assert(properties[0].isUndefined());
-assert(properties[1].isUndefined());
+const serializer = MakeMirrorSerializer(/* details */ true);
+const serialized = serializer.serializeValue(mirror);
+assert.deepStrictEqual(Object.keys(serialized).sort(), ['text', 'type']);
+assert.strictEqual(serialized.type, 'proxy');
+assert.strictEqual(serialized.text, '#<Proxy>');