perf_hooks: convert maxSize to IDL value in setResourceTimingBufferSize

ECMAScript values of WebIDL interface parameters should be converted to
IDL representatives before the actual implementation, as defined in step
11.5 of the WebIDL Overload resolution algorithm.

Refs: https://webidl.spec.whatwg.org/#dfn-create-operation-function
Refs: https://webidl.spec.whatwg.org/#es-overloads
PR-URL: nodejs#44902
Reviewed-By: James M Snell <[email protected]>

Author: legendecas

lib/internal/perf/observe.js

@@ -67,6 +67,7 @@ const {
 const { inspect } = require('util');
 
 const { now } = require('internal/perf/utils');
+const { convertToInt } = require('internal/webidl');
 
 const kDispatch = Symbol('kDispatch');
 const kMaybeBuffer = Symbol('kMaybeBuffer');
@@ -431,6 +432,8 @@ function bufferResourceTiming(entry) {
 
 // https://w3c.github.io/resource-timing/#dom-performance-setresourcetimingbuffersize
 function setResourceTimingBufferSize(maxSize) {
+  // unsigned long
+  maxSize = convertToInt('maxSize', maxSize, 32);
   // If the maxSize parameter is less than resource timing buffer current
   // size, no PerformanceResourceTiming objects are to be removed from the
   // performance entry buffer.

lib/internal/webidl.js

@@ -0,0 +1,163 @@
+'use strict';
+
+const {
+  MathAbs,
+  MathMax,
+  MathMin,
+  MathPow,
+  MathSign,
+  MathTrunc,
+  NumberIsNaN,
+  NumberMAX_SAFE_INTEGER,
+  NumberMIN_SAFE_INTEGER,
+} = primordials;
+
+const {
+  codes: {
+    ERR_INVALID_ARG_VALUE,
+  },
+} = require('internal/errors');
+const { kEmptyObject } = require('internal/util');
+
+// https://webidl.spec.whatwg.org/#abstract-opdef-integerpart
+const integerPart = MathTrunc;
+
+/* eslint-disable node-core/non-ascii-character */
+// Round x to the nearest integer, choosing the even integer if it lies halfway
+// between two, and choosing +0 rather than -0.
+// This is different from Math.round, which rounds to the next integer in the
+// direction of +∞ when the fraction portion is exactly 0.5.
+/* eslint-enable node-core/non-ascii-character */
+function evenRound(x) {
+  // Convert -0 to +0.
+  const i = integerPart(x) + 0;
+  const reminder = MathAbs(x % 1);
+  const sign = MathSign(i);
+  if (reminder === 0.5) {
+    return i % 2 === 0 ? i : i + sign;
+  }
+  const r = reminder < 0.5 ? i : i + sign;
+  // Convert -0 to +0.
+  if (r === 0) {
+    return 0;
+  }
+  return r;
+}
+
+function pow2(exponent) {
+  // << operates on 32 bit signed integers.
+  if (exponent < 31) {
+    return 1 << exponent;
+  }
+  if (exponent === 31) {
+    return 0x8000_0000;
+  }
+  if (exponent === 32) {
+    return 0x1_0000_0000;
+  }
+  return MathPow(2, exponent);
+}
+
+// https://tc39.es/ecma262/#eqn-modulo
+// The notation “x modulo y” computes a value k of the same sign as y.
+function modulo(x, y) {
+  const r = x % y;
+  // Convert -0 to +0.
+  if (r === 0) {
+    return 0;
+  }
+  return r;
+}
+
+// https://webidl.spec.whatwg.org/#abstract-opdef-converttoint
+function convertToInt(name, value, bitLength, options = kEmptyObject) {
+  const { signed = false, enforceRange = false, clamp = false } = options;
+
+  let upperBound;
+  let lowerBound;
+  // 1. If bitLength is 64, then:
+  if (bitLength === 64) {
+    // 1.1. Let upperBound be 2^53 − 1.
+    upperBound = NumberMAX_SAFE_INTEGER;
+    // 1.2. If signedness is "unsigned", then let lowerBound be 0.
+    // 1.3. Otherwise let lowerBound be −2^53 + 1.
+    lowerBound = !signed ? 0 : NumberMIN_SAFE_INTEGER;
+  } else if (!signed) {
+    // 2. Otherwise, if signedness is "unsigned", then:
+    // 2.1. Let lowerBound be 0.
+    // 2.2. Let upperBound be 2^bitLength − 1.
+    lowerBound = 0;
+    upperBound = pow2(bitLength) - 1;
+  } else {
+    // 3. Otherwise:
+    // 3.1. Let lowerBound be -2^(bitLength − 1).
+    // 3.2. Let upperBound be 2^(bitLength − 1) − 1.
+    lowerBound = -pow2(bitLength - 1);
+    upperBound = pow2(bitLength - 1) - 1;
+  }
+
+  // 4. Let x be ? ToNumber(V).
+  let x = +value;
+  // 5. If x is −0, then set x to +0.
+  if (x === 0) {
+    x = 0;
+  }
+
+  // 6. If the conversion is to an IDL type associated with the [EnforceRange]
+  // extended attribute, then:
+  if (enforceRange) {
+    // 6.1. If x is NaN, +∞, or −∞, then throw a TypeError.
+    if (NumberIsNaN(x) || x === Infinity || x === -Infinity) {
+      throw new ERR_INVALID_ARG_VALUE(name, x);
+    }
+    // 6.2. Set x to IntegerPart(x).
+    x = integerPart(x);
+
+    // 6.3. If x < lowerBound or x > upperBound, then throw a TypeError.
+    if (x < lowerBound || x > upperBound) {
+      throw new ERR_INVALID_ARG_VALUE(name, x);
+    }
+
+    // 6.4. Return x.
+    return x;
+  }
+
+  // 7. If x is not NaN and the conversion is to an IDL type associated with
+  // the [Clamp] extended attribute, then:
+  if (clamp && !NumberIsNaN(x)) {
+    // 7.1. Set x to min(max(x, lowerBound), upperBound).
+    x = MathMin(MathMax(x, lowerBound), upperBound);
+
+    // 7.2. Round x to the nearest integer, choosing the even integer if it
+    // lies halfway between two, and choosing +0 rather than −0.
+    x = evenRound(x);
+
+    // 7.3. Return x.
+    return x;
+  }
+
+  // 8. If x is NaN, +0, +∞, or −∞, then return +0.
+  if (NumberIsNaN(x) || x === 0 || x === Infinity || x === -Infinity) {
+    return 0;
+  }
+
+  // 9. Set x to IntegerPart(x).
+  x = integerPart(x);
+
+  // 10. Set x to x modulo 2^bitLength.
+  x = modulo(x, pow2(bitLength));
+
+  // 11. If signedness is "signed" and x ≥ 2^(bitLength − 1), then return x −
+  // 2^bitLength.
+  if (signed && x >= pow2(bitLength - 1)) {
+    return x - pow2(bitLength);
+  }
+
+  // 12. Otherwise, return x.
+  return x;
+}
+
+module.exports = {
+  convertToInt,
+  evenRound,
+};

test/parallel/test-bootstrap-modules.js

@@ -149,6 +149,7 @@ const expectedModules = new Set([
   'NativeModule internal/validators',
   'NativeModule internal/vm/module',
   'NativeModule internal/wasm_web_api',
+  'NativeModule internal/webidl',
   'NativeModule internal/webstreams/adapters',
   'NativeModule internal/webstreams/compression',
   'NativeModule internal/webstreams/encoding',

test/parallel/test-internal-webidl-converttoint.js

@@ -0,0 +1,58 @@
+// Flags: --expose-internals
+'use strict';
+
+require('../common');
+const assert = require('assert');
+const { convertToInt, evenRound } = require('internal/webidl');
+
+assert.strictEqual(evenRound(-0.5), 0);
+assert.strictEqual(evenRound(0.5), 0);
+assert.strictEqual(evenRound(-1.5), -2);
+assert.strictEqual(evenRound(1.5), 2);
+assert.strictEqual(evenRound(3.4), 3);
+assert.strictEqual(evenRound(4.6), 5);
+assert.strictEqual(evenRound(5), 5);
+assert.strictEqual(evenRound(6), 6);
+
+// https://webidl.spec.whatwg.org/#abstract-opdef-converttoint
+assert.strictEqual(convertToInt('x', 0, 64), 0);
+assert.strictEqual(convertToInt('x', 1, 64), 1);
+assert.strictEqual(convertToInt('x', -0.5, 64), 0);
+assert.strictEqual(convertToInt('x', -0.5, 64, { signed: true }), 0);
+assert.strictEqual(convertToInt('x', -1.5, 64, { signed: true }), -1);
+
+// EnforceRange
+const OutOfRangeValues = [ NaN, Infinity, -Infinity, 2 ** 53, -(2 ** 53) ];
+for (const value of OutOfRangeValues) {
+  assert.throws(() => convertToInt('x', value, 64, { enforceRange: true }), {
+    name: 'TypeError',
+    code: 'ERR_INVALID_ARG_VALUE',
+  });
+}
+
+// Out of range: clamp
+assert.strictEqual(convertToInt('x', NaN, 64, { clamp: true }), 0);
+assert.strictEqual(convertToInt('x', Infinity, 64, { clamp: true }), Number.MAX_SAFE_INTEGER);
+assert.strictEqual(convertToInt('x', -Infinity, 64, { clamp: true }), 0);
+assert.strictEqual(convertToInt('x', -Infinity, 64, { signed: true, clamp: true }), Number.MIN_SAFE_INTEGER);
+assert.strictEqual(convertToInt('x', 0x1_0000_0000, 32, { clamp: true }), 0xFFFF_FFFF);
+assert.strictEqual(convertToInt('x', 0xFFFF_FFFF, 32, { clamp: true }), 0xFFFF_FFFF);
+assert.strictEqual(convertToInt('x', 0x8000_0000, 32, { clamp: true, signed: true }), 0x7FFF_FFFF);
+assert.strictEqual(convertToInt('x', 0xFFFF_FFFF, 32, { clamp: true, signed: true }), 0x7FFF_FFFF);
+assert.strictEqual(convertToInt('x', 0.5, 64, { clamp: true }), 0);
+assert.strictEqual(convertToInt('x', 1.5, 64, { clamp: true }), 2);
+assert.strictEqual(convertToInt('x', -0.5, 64, { clamp: true }), 0);
+assert.strictEqual(convertToInt('x', -0.5, 64, { signed: true, clamp: true }), 0);
+assert.strictEqual(convertToInt('x', -1.5, 64, { signed: true, clamp: true }), -2);
+
+// Out of range, step 8.
+assert.strictEqual(convertToInt('x', NaN, 64), 0);
+assert.strictEqual(convertToInt('x', Infinity, 64), 0);
+assert.strictEqual(convertToInt('x', -Infinity, 64), 0);
+assert.strictEqual(convertToInt('x', 0x1_0000_0000, 32), 0);
+assert.strictEqual(convertToInt('x', 0x1_0000_0001, 32), 1);
+assert.strictEqual(convertToInt('x', 0xFFFF_FFFF, 32), 0xFFFF_FFFF);
+
+// Out of range, step 11.
+assert.strictEqual(convertToInt('x', 0x8000_0000, 32, { signed: true }), -0x8000_0000);
+assert.strictEqual(convertToInt('x', 0xFFF_FFFF, 32, { signed: true }), 0xFFF_FFFF);

test/parallel/test-performance-resourcetimingbuffersize.js

@@ -30,6 +30,17 @@ const initiatorType = '';
 const cacheMode = '';
 
 async function main() {
+  // Invalid buffer size values are converted to 0.
+  const invalidValues = [ null, undefined, true, false, -1, 0.5, Infinity, NaN, '', 'foo', {}, [], () => {} ];
+  for (const value of invalidValues) {
+    performance.setResourceTimingBufferSize(value);
+    performance.markResourceTiming(timingInfo, requestedUrl, initiatorType, globalThis, cacheMode);
+    assert.strictEqual(performance.getEntriesByType('resource').length, 0);
+    performance.clearResourceTimings();
+  }
+  // Wait for the buffer full event to be cleared.
+  await waitBufferFullEvent();
+
   performance.setResourceTimingBufferSize(1);
   performance.markResourceTiming(timingInfo, requestedUrl, initiatorType, globalThis, cacheMode);
   // Trigger a resourcetimingbufferfull event.