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assert,util: fix constructor lookup in deep equal comparison · nodejs/node@1c7396b · GitHub

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Commit 1c7396b

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BridgeAR
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aduh95
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assert,util: fix constructor lookup in deep equal comparison
The latest performance optimization did not take into account that an object may have a property called constructor. This is addressed in this PR by adding a new fast path and using fallbacks. PR-URL: #57876 Reviewed-By: Jordan Harband <ljharb@gmail.com> Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
1 parent 010dd91 commit 1c7396b

4 files changed

Lines changed: 335 additions & 45 deletions

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‎benchmark/assert/deepequal-prims-and-objs-big-loop.js‎

Lines changed: 3 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -10,6 +10,7 @@ const notCircular = {};
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notCircular.circular = {};
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const primValues = {
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'null_prototype': { __proto__: null },
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'string': 'abcdef',
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'number': 1_000,
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'boolean': true,
@@ -24,6 +25,7 @@ const primValues = {
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};
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const primValues2 = {
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'null_prototype': { __proto__: null },
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'object': { property: 'abcdef' },
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'array': [1, 2, 3],
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'set_object': new Set([[1]]),
@@ -35,6 +37,7 @@ const primValues2 = {
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};
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const primValuesUnequal = {
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'null_prototype': { __proto__: { __proto__: null } },
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'string': 'abcdez',
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'number': 1_001,
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'boolean': false,

‎lib/internal/util/comparisons.js‎

Lines changed: 75 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -1,14 +1,31 @@
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'use strict';
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const {
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Array,
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ArrayBuffer,
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ArrayIsArray,
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ArrayPrototypeFilter,
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ArrayPrototypePush,
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BigInt,
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BigInt64Array,
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BigIntPrototypeValueOf,
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BigUint64Array,
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Boolean,
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BooleanPrototypeValueOf,
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DataView,
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Date,
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DatePrototypeGetTime,
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Error,
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Float32Array,
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Float64Array,
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Function,
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Int16Array,
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Int32Array,
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Int8Array,
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Map,
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Number,
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NumberPrototypeValueOf,
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Object,
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ObjectGetOwnPropertyDescriptor,
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ObjectGetOwnPropertySymbols: getOwnSymbols,
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ObjectGetPrototypeOf,
@@ -17,18 +34,67 @@ const {
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ObjectPrototypeHasOwnProperty: hasOwn,
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ObjectPrototypePropertyIsEnumerable: hasEnumerable,
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ObjectPrototypeToString,
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Promise,
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RegExp,
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SafeSet,
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Set,
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String,
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StringPrototypeValueOf,
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Symbol,
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SymbolPrototypeValueOf,
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TypedArrayPrototypeGetByteLength: getByteLength,
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TypedArrayPrototypeGetSymbolToStringTag,
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Uint16Array,
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Uint32Array,
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Uint8Array,
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Uint8ClampedArray,
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WeakMap,
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WeakSet,
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globalThis: { Float16Array },
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} = primordials;
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const { compare } = internalBinding('buffer');
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const assert = require('internal/assert');
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const { isError } = require('internal/util');
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const { isURL } = require('internal/url');
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const { Buffer } = require('buffer');
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const wellKnownConstructors = new SafeSet()
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.add(Array)
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.add(ArrayBuffer)
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.add(BigInt)
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.add(BigInt64Array)
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.add(BigUint64Array)
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.add(Boolean)
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.add(Buffer)
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.add(DataView)
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.add(Date)
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.add(Error)
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.add(Float32Array)
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.add(Float64Array)
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.add(Function)
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.add(Int16Array)
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.add(Int32Array)
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.add(Int8Array)
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.add(Map)
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.add(Number)
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.add(Object)
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.add(Promise)
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.add(RegExp)
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.add(Set)
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.add(String)
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.add(Symbol)
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.add(Uint16Array)
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.add(Uint32Array)
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.add(Uint8Array)
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.add(Uint8ClampedArray)
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.add(WeakMap)
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.add(WeakSet);
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if (Float16Array) { // TODO(BridgeAR): Remove when regularly supported
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wellKnownConstructors.add(Float16Array);
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}
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const types = require('internal/util/types');
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const {
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isAnyArrayBuffer,
@@ -199,11 +265,15 @@ function innerDeepEqual(val1, val2, mode, memos) {
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}
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function objectComparisonStart(val1, val2, mode, memos) {
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if (mode === kStrict &&
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(val1.constructor !== val2.constructor ||
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(val1.constructor === undefined &&
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ObjectGetPrototypeOf(val1) !== ObjectGetPrototypeOf(val2)))) {
206-
return false;
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if (mode === kStrict) {
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if (wellKnownConstructors.has(val1.constructor) ||
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(val1.constructor !== undefined && !hasOwn(val1, 'constructor'))) {
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if (val1.constructor !== val2.constructor) {
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return false;
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}
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} else if (ObjectGetPrototypeOf(val1) !== ObjectGetPrototypeOf(val2)) {
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return false;
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}
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}
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const val1Tag = ObjectPrototypeToString(val1);

‎lib/internal/util/inspect.js‎

Lines changed: 36 additions & 9 deletions
Original file line numberDiff line numberDiff line change
@@ -20,10 +20,18 @@ const {
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ArrayPrototypeSplice,
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ArrayPrototypeUnshift,
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BigIntPrototypeValueOf,
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Boolean,
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BooleanPrototype,
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BooleanPrototypeValueOf,
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DataView,
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DataViewPrototype,
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Date,
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DatePrototype,
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DatePrototypeGetTime,
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DatePrototypeToISOString,
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DatePrototypeToString,
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Error,
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ErrorPrototype,
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ErrorPrototypeToString,
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Function,
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FunctionPrototype,
@@ -47,6 +55,7 @@ const {
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NumberIsNaN,
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NumberParseFloat,
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NumberParseInt,
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NumberPrototype,
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NumberPrototypeToString,
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NumberPrototypeValueOf,
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Object,
@@ -63,9 +72,12 @@ const {
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ObjectPrototypePropertyIsEnumerable,
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ObjectSeal,
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ObjectSetPrototypeOf,
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Promise,
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PromisePrototype,
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ReflectApply,
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ReflectOwnKeys,
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RegExp,
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RegExpPrototype,
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RegExpPrototypeExec,
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RegExpPrototypeSymbolReplace,
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RegExpPrototypeSymbolSplit,
@@ -78,6 +90,7 @@ const {
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SetPrototypeGetSize,
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SetPrototypeValues,
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String,
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StringPrototype,
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StringPrototypeCharCodeAt,
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StringPrototypeCodePointAt,
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StringPrototypeEndsWith,
@@ -106,6 +119,10 @@ const {
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TypedArrayPrototypeGetLength,
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TypedArrayPrototypeGetSymbolToStringTag,
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Uint8Array,
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WeakMap,
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WeakMapPrototype,
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WeakSet,
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WeakSetPrototype,
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globalThis,
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uncurryThis,
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} = primordials;
@@ -608,21 +625,31 @@ function isInstanceof(object, proto) {
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}
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// Special-case for some builtin prototypes in case their `constructor` property has been tampered.
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const wellKnownPrototypes = new SafeMap();
612-
wellKnownPrototypes.set(ArrayPrototype, { name: 'Array', constructor: Array });
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wellKnownPrototypes.set(ArrayBufferPrototype, { name: 'ArrayBuffer', constructor: ArrayBuffer });
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wellKnownPrototypes.set(FunctionPrototype, { name: 'Function', constructor: Function });
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wellKnownPrototypes.set(MapPrototype, { name: 'Map', constructor: Map });
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wellKnownPrototypes.set(ObjectPrototype, { name: 'Object', constructor: Object });
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wellKnownPrototypes.set(SetPrototype, { name: 'Set', constructor: Set });
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wellKnownPrototypes.set(TypedArrayPrototype, { name: 'TypedArray', constructor: TypedArray });
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const wellKnownPrototypes = new SafeMap()
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.set(ArrayPrototype, { name: 'Array', constructor: Array })
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.set(ArrayBufferPrototype, { name: 'ArrayBuffer', constructor: ArrayBuffer })
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.set(FunctionPrototype, { name: 'Function', constructor: Function })
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.set(MapPrototype, { name: 'Map', constructor: Map })
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.set(SetPrototype, { name: 'Set', constructor: Set })
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.set(ObjectPrototype, { name: 'Object', constructor: Object })
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.set(TypedArrayPrototype, { name: 'TypedArray', constructor: TypedArray })
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.set(RegExpPrototype, { name: 'RegExp', constructor: RegExp })
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.set(DatePrototype, { name: 'Date', constructor: Date })
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.set(DataViewPrototype, { name: 'DataView', constructor: DataView })
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.set(ErrorPrototype, { name: 'Error', constructor: Error })
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.set(BooleanPrototype, { name: 'Boolean', constructor: Boolean })
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.set(NumberPrototype, { name: 'Number', constructor: Number })
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.set(StringPrototype, { name: 'String', constructor: String })
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.set(PromisePrototype, { name: 'Promise', constructor: Promise })
644+
.set(WeakMapPrototype, { name: 'WeakMap', constructor: WeakMap })
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.set(WeakSetPrototype, { name: 'WeakSet', constructor: WeakSet });
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620647
function getConstructorName(obj, ctx, recurseTimes, protoProps) {
621648
let firstProto;
622649
const tmp = obj;
623650
while (obj || isUndetectableObject(obj)) {
624651
const wellKnownPrototypeNameAndConstructor = wellKnownPrototypes.get(obj);
625-
if (wellKnownPrototypeNameAndConstructor != null) {
652+
if (wellKnownPrototypeNameAndConstructor !== undefined) {
626653
const { name, constructor } = wellKnownPrototypeNameAndConstructor;
627654
if (FunctionPrototypeSymbolHasInstance(constructor, tmp)) {
628655
if (protoProps !== undefined && firstProto !== obj) {

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