Revert of [strong] Implement strong mode restrictions on property access

test/mjsunit/strong/load-property.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: --strong-mode --allow-natives-syntax
-
-function getSloppyArguments() {
-  return arguments;
-}
-
-function getObjects() {
-  "use strict";
-  return [
-    {},
-    Object(""),
-    [],
-    (function(){}),
-    (class Foo {}),
-    getSloppyArguments(),
-    arguments,
-    new Date(),
-    new Uint32Array(0)
-  ];
-}
-
-function readFromObjectSloppy(o) {
-    return o.foo;
-}
-
-function readFromObjectKeyedSloppy(o) {
-    return o["foo"];
-}
-
-function readFromObjectKeyedVarSloppy(o) {
-  var a = "foo";
-  return o[a];
-}
-
-function readFromObjectKeyedComputedSloppy(o) {
-  var a = "o";
-  return o["fo" + a];
-}
-
-function readFromObjectStrong(o) {
-  "use strong";
-  return o.foo;
-}
-
-function readFromObjectKeyedStrong(o) {
-  "use strong";
-  return o["foo"];
-}
-
-function readFromObjectKeyedLetStrong(o) {
-  "use strong";
-  let a = "foo";
-  return o[a];
-}
-
-function readFromObjectKeyedComputedStrong(o) {
-  "use strong";
-  let a = "o";
-  return o["fo" + a];
-}
-
-function getDescs(x) {
-  return [
-    {value: x},
-    {configurable: true, enumerable: true, writable: true, value: x},
-    {configurable: true, enumerable: true, get: (function() {return x}) },
-  ];
-}
-
-function assertStrongSemantics(func, object) {
-  %DeoptimizeFunction(func);
-  %ClearFunctionTypeFeedback(func);
-  assertThrows(function(){func(object)}, TypeError);
-  assertThrows(function(){func(object)}, TypeError);
-  assertThrows(function(){func(object)}, TypeError);
-  %OptimizeFunctionOnNextCall(func);
-  assertThrows(function(){func(object)}, TypeError);
-  %DeoptimizeFunction(func);
-  assertThrows(function(){func(object)}, TypeError);
-}
-
-function assertSloppySemantics(func, object) {
-  %DeoptimizeFunction(func);
-  %ClearFunctionTypeFeedback(func);
-  assertDoesNotThrow(function(){func(object)});
-  assertDoesNotThrow(function(){func(object)});
-  assertDoesNotThrow(function(){func(object)});
-  %OptimizeFunctionOnNextCall(func);
-  assertDoesNotThrow(function(){func(object)});
-  %DeoptimizeFunction(func);
-  assertDoesNotThrow(function(){func(object)});
-}
-
-(function () {
-  "use strict";
-
-  let goodKeys = [
-    "foo"
-  ]
-
-  let badKeys = [
-    "bar",
-    "1",
-    "100001",
-    "3000000001",
-    "5000000001"
-  ];
-
-  let values = [
-    "string",
-    1,
-    100001,
-    30000000001,
-    50000000001,
-    NaN,
-    {},
-    undefined
-  ];
-
-  let literals = [0, NaN, true, "string"];
-
-  let badAccessorDescs = [
-    { set: (function(){}) },
-    { configurable: true, enumerable: true, set: (function(){}) }
-  ];
-
-  let readSloppy = [
-    readFromObjectSloppy,
-    readFromObjectKeyedSloppy,
-    readFromObjectKeyedVarSloppy,
-    readFromObjectKeyedComputedSloppy
-  ];
-
-  let readStrong = [
-    readFromObjectStrong,
-    readFromObjectKeyedStrong,
-    readFromObjectKeyedLetStrong,
-    readFromObjectKeyedComputedStrong
-  ];
-
-  let dummyProto = {};
-  for (let key of goodKeys) {
-    Object.defineProperty(dummyProto, key, { value: undefined });
-  }
-
-  let dummyAccessorProto = {};
-  for (let key of goodKeys) {
-    Object.defineProperty(dummyAccessorProto, key, { set: (function(){}) })
-  }
-
-  // Attempting to access a property on an object with no defined properties
-  // should throw.
-  for (let object of getObjects().concat(literals)) {
-    for (let func of readStrong) {
-      assertStrongSemantics(func, object);
-    }
-    for (let func of readSloppy) {
-      assertSloppySemantics(func, object);
-    }
-  }
-  for (let object of getObjects()) {
-    // Accessing a property which is on the prototype chain of the object should
-    // not throw.
-    object.__proto__ = dummyProto;
-    for (let key of goodKeys) {
-      for (let func of readStrong.concat(readSloppy)) {
-        assertSloppySemantics(func, object);
-      }
-    }
-  }
-  // Properties with accessor descriptors missing 'get' should throw on access.
-  for (let desc of badAccessorDescs) {
-    for (let key of goodKeys) {
-      for (let object of getObjects()) {
-        Object.defineProperty(object, key, desc);
-        for (let func of readStrong) {
-          assertStrongSemantics(func, object);
-        }
-        for (let func of readSloppy) {
-          assertSloppySemantics(func, object);
-        }
-      }
-    }
-  }
-  // The same behaviour should be expected for bad accessor properties on the
-  // prototype chain.
-  for (let object of getObjects()) {
-    object.__proto__ = dummyAccessorProto;
-    for (let func of readStrong) {
-      assertStrongSemantics(func, object);
-    }
-    for (let func of readSloppy) {
-      assertSloppySemantics(func, object);
-    }
-  }
-})();