v8: handle proxy objects in MakeMirror(), v1

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 105
+#define V8_PATCH_LEVEL 106
 
 // Use 1 for candidates and 0 otherwise.
 // (Boolean macro values are not supported by all preprocessors.)

deps/v8/src/runtime/runtime-debug.cc

@@ -310,6 +310,7 @@ 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);
 
@@ -382,6 +383,7 @@ 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);
 
@@ -1318,6 +1320,7 @@ 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());
@@ -1408,6 +1411,7 @@ 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

test/parallel/test-debug-mirror-proxy.js

@@ -0,0 +1,30 @@
+'use strict';
+
+require('../common');
+const assert = require('assert');
+const vm = require('vm');
+
+const { MakeMirror } = 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>');
+
+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());