[proxy] fixing harmony/proxy.js tests and improving error messages + some drive-by fixes

test/mjsunit/for-in-opt.js

-// Copyright 2015 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.
-
-// Flags: --harmony-proxies --allow-natives-syntax --expose-debug-as debug
-
-"use strict";
-
-// Test non-JSObject receiver.
-function f(o) {
-  var result = [];
-  for (var i in o) {
-    result.push(i);
-  }
-  return result;
-}
-
-assertEquals(["0"], f("a"));

[Jakob Kummerow, 2015/12/10 15:35:03]

What's wrong with this? (I mean the entire file.)

[neis, 2015/12/10 16:08:13]

I tried to figure out what it was testing (in order to meaningfully convert the
test) but gave up.

[Camillo Bruni, 2015/12/10 20:22:13]

enabled it again (for in + proxies + prototype walks had a minor bug)

-assertEquals(["0"], f("a"));
-%OptimizeFunctionOnNextCall(f);
-assertEquals(["0","1","2"], f("bla"));
-
-// Test the lazy deopt points.
-var keys = ["a", "b", "c", "d"];
-var has_keys = [];
-var deopt_has = false;
-var deopt_enum = false;
-
-var handler = {
-  enumerate: function(target) {
-    if (deopt_enum) {
-      %DeoptimizeFunction(f2);
-      deopt_enum = false;
-    }
-    return keys;
-  },
-
-  getPropertyDescriptor: function(k) {
-    if (deopt_has) {
-      %DeoptimizeFunction(f2);
-      deopt_has = false;
-    }
-    has_keys.push(k);
-    return {value: 10, configurable: true, writable: false, enumerable: true};
-  }
-};
-
-
-var proxy = new Proxy({}, handler);
-var o = {__proto__: proxy};
-
-function f2(o) {
-  var result = [];
-  for (var i in o) {
-    result.push(i);
-  }
-  return result;
-}
-
-function check_f2() {
-  assertEquals(keys, f2(o));
-  assertEquals(keys, has_keys);
-  has_keys.length = 0;
-}
-
-check_f2();
-check_f2();
-// Test lazy deopt after GetPropertyNamesFast
-%OptimizeFunctionOnNextCall(f2);
-deopt_enum = true;
-check_f2();
-// Test lazy deopt after FILTER_KEY
-%OptimizeFunctionOnNextCall(f2);
-deopt_has = true;
-check_f2();
-
-function f3(o) {
-  for (var i in o) {
-  }
-}
-
-f3({__proto__:{x:1}});
-f3({__proto__:{x:1}});
-%OptimizeFunctionOnNextCall(f3);
-f3(undefined);
-f3(null);
-
-// Reliable repro for an issue previously flushed out by GC stress.
-var handler2 = {
-  getPropertyDescriptor: function(k) {
-    has_keys.push(k);
-    return {value: 10, configurable: true, writable: false, enumerable: true};
-  }
-}
-var proxy2 = new Proxy({}, handler2);
-var o2 = {__proto__: proxy2};
-var p = {x: "x"}
-
-function f4(o, p) {
-  var result = [];
-  for (var i in o) {
-    var j = p.x + "str";
-    result.push(i);
-  }
-  return result;
-}
-function check_f4() {
-  assertEquals(keys, f4(o, p));
-  assertEquals(keys, has_keys);
-  has_keys.length = 0;
-}
-check_f4();
-check_f4();
-%OptimizeFunctionOnNextCall(f4);
-p.y = "y";  // Change map, cause eager deopt.
-check_f4();
-
-// Repro for Turbofan equivalent.
-var x;
-var count = 0;
-
-var Debug = debug.Debug;
-
-function listener(event, exec_state, event_data, data) {
-  if (event == Debug.DebugEvent.Break) {
-    %DeoptimizeFunction(f5);
-  }
-}
-
-var handler3 = {
-  enumerate: function(target) {
-    return ["a", "b"];
-  },
-
-  getPropertyDescriptor: function(k) {
-    if (k == "a") count++;
-    if (x) %ScheduleBreak();
-    return {value: 10, configurable: true, writable: false, enumerable: true};
-  }
-};
-
-var proxy3 = new Proxy({}, handler3);
-var o3 = {__proto__: proxy3};
-
-function f5() {
-  for (var p in o3) {
-    print(p);
-  }
-}
-
-x = false;
-
-f5(); f5(); f5();
-%OptimizeFunctionOnNextCall(f5);
-x = true;
-count = 0;
-Debug.setListener(listener);
-f5();
-Debug.setListener(null);
-assertEquals(1, count);