errors: improve hideStackFrames

Author: Uzlopak

benchmark/error/hidestackframes-noerr.js

@@ -0,0 +1,62 @@
+'use strict';
+
+const common = require('../common.js');
+const assert = require('assert');
+
+const bench = common.createBenchmark(main, {
+  type: [
+    'hide-stackframes',
+    'direct-call',
+  ],
+  n: [1e7],
+}, {
+  flags: ['--expose-internals'],
+});
+
+function main({ n, type }) {
+  const {
+    hideStackFrames,
+    codes: {
+      ERR_INVALID_ARG_TYPE,
+    },
+  } = require('internal/errors');
+
+  const testfn = (value) => {
+    if (typeof value !== 'number') {
+      throw new ERR_INVALID_ARG_TYPE('Benchmark', 'number', value);
+    }
+  };
+
+  const hideStackFramesTestfn = hideStackFrames((value) => {
+    if (typeof value !== 'number') {
+      throw new ERR_INVALID_ARG_TYPE.HideStackFrameError('Benchmark', 'number', value);
+    }
+  });
+
+  const fn = type === 'hide-stackframe' ? hideStackFramesTestfn : testfn;
+
+  const value = 42;
+
+  const length = 1024;
+  const array = [];
+  const errCase = false;
+
+  for (let i = 0; i < length; ++i) {
+    array.push(fn(value));
+  }
+
+  bench.start();
+
+  for (let i = 0; i < n; i++) {
+    const index = i % length;
+    array[index] = fn(value);
+  }
+
+  bench.end(n);
+
+  // Verify the entries to prevent dead code elimination from making
+  // the benchmark invalid.
+  for (let i = 0; i < length; ++i) {
+    assert.strictEqual(typeof array[i], errCase ? 'object' : 'undefined');
+  }
+}

benchmark/error/hidestackframes-throw.js

@@ -0,0 +1,87 @@
+'use strict';
+
+const common = require('../common.js');
+const assert = require('assert');
+
+const bench = common.createBenchmark(main, {
+  type: [
+    'hide-stackframes',
+    'direct-call',
+  ],
+  double: ['true', 'false'],
+  n: [1e5],
+}, {
+  flags: ['--expose-internals'],
+});
+
+function main({ n, type, double }) {
+  const {
+    hideStackFrames,
+    codes: {
+      ERR_INVALID_ARG_TYPE,
+    },
+  } = require('internal/errors');
+
+  const value = 'err';
+
+  const testfn = (value) => {
+    if (typeof value !== 'number') {
+      throw new ERR_INVALID_ARG_TYPE('Benchmark', 'number', value);
+    }
+  };
+
+  const hideStackFramesTestfn = hideStackFrames((value) => {
+    if (typeof value !== 'number') {
+      throw new ERR_INVALID_ARG_TYPE.HideStackFrameError('Benchmark', 'number', value);
+    }
+  });
+
+  function doubleTestfn(value) {
+    testfn(value);
+  }
+
+  const doubleHideStackFramesTestfn = hideStackFrames((value) => {
+    hideStackFramesTestfn(value);
+  });
+
+  const fn = type === 'hide-stackframe' ?
+    double === 'true' ?
+      doubleHideStackFramesTestfn :
+      hideStackFramesTestfn :
+    double === 'true' ?
+      doubleTestfn :
+      testfn;
+
+  const length = 1024;
+  const array = [];
+  let errCase = false;
+
+  // Warm up.
+  for (let i = 0; i < length; ++i) {
+    try {
+      fn(value);
+    } catch (e) {
+      errCase = true;
+      array.push(e);
+    }
+  }
+
+  bench.start();
+
+  for (let i = 0; i < n; i++) {
+    const index = i % length;
+    try {
+      fn(value);
+    } catch (e) {
+      array[index] = e;
+    }
+  }
+
+  bench.end(n);
+
+  // Verify the entries to prevent dead code elimination from making
+  // the benchmark invalid.
+  for (let i = 0; i < length; ++i) {
+    assert.strictEqual(typeof array[i], errCase ? 'object' : 'undefined');
+  }
+}

benchmark/error/hidestackframes.js

@@ -619,17 +619,17 @@ function matchHeader(self, state, field, value) {
 
 const validateHeaderName = hideStackFrames((name, label) => {
   if (typeof name !== 'string' || !name || !checkIsHttpToken(name)) {
-    throw new ERR_INVALID_HTTP_TOKEN(label || 'Header name', name);
+    throw new ERR_INVALID_HTTP_TOKEN.HideStackFramesError(label || 'Header name', name);
   }
 });
 
 const validateHeaderValue = hideStackFrames((name, value) => {
   if (value === undefined) {
-    throw new ERR_HTTP_INVALID_HEADER_VALUE(value, name);
+    throw new ERR_HTTP_INVALID_HEADER_VALUE.HideStackFramesError(value, name);
   }
   if (checkInvalidHeaderChar(value)) {
     debug('Header "%s" contains invalid characters', name);
-    throw new ERR_INVALID_CHAR('header content', name);
+    throw new ERR_INVALID_CHAR.HideStackFramesError('header content', name);
   }
 });
 

lib/_http_outgoing.js

@@ -108,7 +108,6 @@ const {
     ERR_UNKNOWN_ENCODING,
   },
   genericNodeError,
-  hideStackFrames,
 } = require('internal/errors');
 const {
   validateArray,
@@ -386,19 +385,12 @@ Buffer.of = of;
 
 ObjectSetPrototypeOf(Buffer, Uint8Array);
 
-// The 'assertSize' method will remove itself from the callstack when an error
-// occurs. This is done simply to keep the internal details of the
-// implementation from bleeding out to users.
-const assertSize = hideStackFrames((size) => {
-  validateNumber(size, 'size', 0, kMaxLength);
-});
-
 /**
  * Creates a new filled Buffer instance.
  * alloc(size[, fill[, encoding]])
  */
 Buffer.alloc = function alloc(size, fill, encoding) {
-  assertSize(size);
+  validateNumber(size, 'size', 0, kMaxLength);
   if (fill !== undefined && fill !== 0 && size > 0) {
     const buf = createUnsafeBuffer(size);
     return _fill(buf, fill, 0, buf.length, encoding);
@@ -411,7 +403,7 @@ Buffer.alloc = function alloc(size, fill, encoding) {
  * instance. If `--zero-fill-buffers` is set, will zero-fill the buffer.
  */
 Buffer.allocUnsafe = function allocUnsafe(size) {
-  assertSize(size);
+  validateNumber(size, 'size', 0, kMaxLength);
   return allocate(size);
 };
 
@@ -421,15 +413,15 @@ Buffer.allocUnsafe = function allocUnsafe(size) {
  * If `--zero-fill-buffers` is set, will zero-fill the buffer.
  */
 Buffer.allocUnsafeSlow = function allocUnsafeSlow(size) {
-  assertSize(size);
+  validateNumber(size, 'size', 0, kMaxLength);
   return createUnsafeBuffer(size);
 };
 
 // If --zero-fill-buffers command line argument is set, a zero-filled
 // buffer is returned.
-function SlowBuffer(length) {
-  assertSize(length);
-  return createUnsafeBuffer(length);
+function SlowBuffer(size) {
+  validateNumber(size, 'size', 0, kMaxLength);
+  return createUnsafeBuffer(size);
 }
 
 ObjectSetPrototypeOf(SlowBuffer.prototype, Uint8ArrayPrototype);