808dc8cff3
This CL speeds up a common pattern found in the React framework:
function f(a, b, c) { ... };
let f_bound = f.bind(this, 1);
let f_bound2 = f_bound(this, 2);
This CL yields roughly a 15x improvement for rebinding a bound function.
Change-Id: I4d8580a5bce422af411148bc6b3e4eb287fac9ce
Reviewed-on: https://chromium-review.googlesource.com/695206
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48283}
379 lines
11 KiB
JavaScript
379 lines
11 KiB
JavaScript
// Copyright 2010 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// Flags: --allow-natives-syntax
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// Tests the Function.prototype.bind method.
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// Simple tests.
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function foo(x, y, z) {
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return [this, arguments.length, x];
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}
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assertEquals(3, foo.length);
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var f = foo.bind(foo);
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assertEquals([foo, 3, 1], f(1, 2, 3));
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assertEquals(3, f.length);
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assertEquals("function () { [native code] }", f.toString());
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%HeapObjectVerify(f);
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f = foo.bind(foo, 1);
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assertEquals([foo, 3, 1], f(2, 3));
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assertEquals(2, f.length);
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assertEquals("function () { [native code] }", f.toString());
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%HeapObjectVerify(f);
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f = foo.bind(foo, 1, 2);
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assertEquals([foo, 3, 1], f(3));
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assertEquals(1, f.length);
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assertEquals("function () { [native code] }", f.toString());
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%HeapObjectVerify(f);
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f = foo.bind(foo, 1, 2, 3);
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assertEquals([foo, 3, 1], f());
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assertEquals(0, f.length);
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assertEquals("function () { [native code] }", f.toString());
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%HeapObjectVerify(f);
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// Test that length works correctly even if more than the actual number
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// of arguments are given when binding.
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f = foo.bind(foo, 1, 2, 3, 4, 5, 6, 7, 8, 9);
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assertEquals([foo, 9, 1], f());
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assertEquals(0, f.length);
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assertEquals("function () { [native code] }", f.toString());
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%HeapObjectVerify(f);
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// Use a different bound object.
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var obj = {x: 42, y: 43};
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// Values that would normally be in "this" when calling f_bound_this.
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var x = 42;
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var y = 44;
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function f_bound_this(z) {
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return z + this.y - this.x;
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}
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assertEquals(3, f_bound_this(1))
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f = f_bound_this.bind(obj);
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assertEquals(2, f(1));
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assertEquals(1, f.length);
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%HeapObjectVerify(f);
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f = f_bound_this.bind(obj, 2);
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assertEquals(3, f());
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assertEquals(0, f.length);
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assertEquals('[object Function]', Object.prototype.toString.call(f));
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%HeapObjectVerify(f);
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// Test chained binds.
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// When only giving the thisArg, any number of binds should have
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// the same effect.
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f = foo.bind(foo);
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assertEquals([foo, 3, 1], f(1, 2, 3));
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%HeapObjectVerify(f);
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var not_foo = {};
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f = foo.bind(foo).bind(not_foo).bind(not_foo).bind(not_foo);
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assertEquals([foo, 3, 1], f(1, 2, 3));
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assertEquals(3, f.length);
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%HeapObjectVerify(f);
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// Giving bound parameters should work at any place in the chain.
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f = foo.bind(foo, 1).bind(not_foo).bind(not_foo).bind(not_foo);
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assertEquals([foo, 3, 1], f(2, 3));
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assertEquals(2, f.length);
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%HeapObjectVerify(f);
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f = foo.bind(foo).bind(not_foo, 1).bind(not_foo).bind(not_foo);
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assertEquals([foo, 3, 1], f(2, 3));
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assertEquals(2, f.length);
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%HeapObjectVerify(f);
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f = foo.bind(foo).bind(not_foo).bind(not_foo,1 ).bind(not_foo);
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assertEquals([foo, 3, 1], f(2, 3));
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assertEquals(2, f.length);
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%HeapObjectVerify(f);
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f = foo.bind(foo).bind(not_foo).bind(not_foo).bind(not_foo, 1);
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assertEquals([foo, 3, 1], f(2, 3));
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assertEquals(2, f.length);
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%HeapObjectVerify(f);
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// Several parameters can be given, and given in different bind invocations.
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f = foo.bind(foo, 1, 2).bind(not_foo).bind(not_foo).bind(not_foo);
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assertEquals([foo, 3, 1], f(3));
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assertEquals(1, f.length);
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%HeapObjectVerify(f);
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f = foo.bind(foo).bind(not_foo, 1, 2).bind(not_foo).bind(not_foo);
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assertEquals([foo, 3, 1], f(1));
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assertEquals(1, f.length);
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%HeapObjectVerify(f);
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f = foo.bind(foo).bind(not_foo, 1, 2).bind(not_foo).bind(not_foo);
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assertEquals([foo, 3, 1], f(3));
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assertEquals(1, f.length);
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%HeapObjectVerify(f);
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f = foo.bind(foo).bind(not_foo).bind(not_foo, 1, 2).bind(not_foo);
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assertEquals([foo, 3, 1], f(1));
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assertEquals(1, f.length);
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%HeapObjectVerify(f);
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f = foo.bind(foo).bind(not_foo).bind(not_foo).bind(not_foo, 1, 2);
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assertEquals([foo, 3, 1], f(3));
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assertEquals(1, f.length);
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%HeapObjectVerify(f);
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f = foo.bind(foo, 1).bind(not_foo, 2).bind(not_foo).bind(not_foo);
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assertEquals([foo, 3, 1], f(3));
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assertEquals(1, f.length);
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%HeapObjectVerify(f);
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f = foo.bind(foo, 1).bind(not_foo).bind(not_foo, 2).bind(not_foo);
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assertEquals([foo, 3, 1], f(3));
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assertEquals(1, f.length);
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%HeapObjectVerify(f);
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f = foo.bind(foo, 1).bind(not_foo).bind(not_foo).bind(not_foo, 2);
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assertEquals([foo, 3, 1], f(3));
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assertEquals(1, f.length);
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%HeapObjectVerify(f);
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f = foo.bind(foo).bind(not_foo, 1).bind(not_foo).bind(not_foo, 2);
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assertEquals([foo, 3, 1], f(3));
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assertEquals(1, f.length);
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%HeapObjectVerify(f);
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// The wrong number of arguments can be given to bound functions too.
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f = foo.bind(foo);
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assertEquals(3, f.length);
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assertEquals([foo, 0, undefined], f());
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assertEquals([foo, 1, 1], f(1));
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assertEquals([foo, 2, 1], f(1, 2));
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assertEquals([foo, 3, 1], f(1, 2, 3));
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assertEquals([foo, 4, 1], f(1, 2, 3, 4));
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%HeapObjectVerify(f);
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f = foo.bind(foo, 1);
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assertEquals(2, f.length);
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assertEquals([foo, 1, 1], f());
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assertEquals([foo, 2, 1], f(2));
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assertEquals([foo, 3, 1], f(2, 3));
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assertEquals([foo, 4, 1], f(2, 3, 4));
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%HeapObjectVerify(f);
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f = foo.bind(foo, 1, 2);
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assertEquals(1, f.length);
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assertEquals([foo, 2, 1], f());
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assertEquals([foo, 3, 1], f(3));
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assertEquals([foo, 4, 1], f(3, 4));
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%HeapObjectVerify(f);
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f = foo.bind(foo, 1, 2, 3);
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assertEquals(0, f.length);
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assertEquals([foo, 3, 1], f());
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assertEquals([foo, 4, 1], f(4));
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%HeapObjectVerify(f);
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f = foo.bind(foo, 1, 2, 3, 4);
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assertEquals(0, f.length);
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assertEquals([foo, 4, 1], f());
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%HeapObjectVerify(f);
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// Test constructor calls.
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function bar(x, y, z) {
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this.x = x;
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this.y = y;
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this.z = z;
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}
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f = bar.bind(bar);
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var obj2 = new f(1,2,3);
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assertEquals(1, obj2.x);
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assertEquals(2, obj2.y);
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assertEquals(3, obj2.z);
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%HeapObjectVerify(f);
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%HeapObjectVerify(obj2);
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f = bar.bind(bar, 1);
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obj2 = new f(2,3);
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assertEquals(1, obj2.x);
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assertEquals(2, obj2.y);
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assertEquals(3, obj2.z);
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%HeapObjectVerify(f);
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%HeapObjectVerify(obj2);
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f = bar.bind(bar, 1, 2);
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obj2 = new f(3);
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assertEquals(1, obj2.x);
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assertEquals(2, obj2.y);
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assertEquals(3, obj2.z);
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%HeapObjectVerify(f);
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%HeapObjectVerify(obj2);
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f = bar.bind(bar, 1, 2, 3);
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obj2 = new f();
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assertEquals(1, obj2.x);
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assertEquals(2, obj2.y);
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assertEquals(3, obj2.z);
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%HeapObjectVerify(f);
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%HeapObjectVerify(obj2);
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// Test bind chains when used as a constructor.
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f = bar.bind(bar, 1).bind(bar, 2).bind(bar, 3);
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obj2 = new f();
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assertEquals(1, obj2.x);
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assertEquals(2, obj2.y);
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assertEquals(3, obj2.z);
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%HeapObjectVerify(f);
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%HeapObjectVerify(obj2);
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// Test obj2 is instanceof both bar and f.
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assertTrue(obj2 instanceof bar);
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assertTrue(obj2 instanceof f);
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// This-args are not relevant to instanceof.
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f = bar.bind(foo.prototype, 1).
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bind(String.prototype, 2).
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bind(Function.prototype, 3);
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var obj3 = new f();
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assertTrue(obj3 instanceof bar);
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assertTrue(obj3 instanceof f);
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assertFalse(obj3 instanceof foo);
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assertFalse(obj3 instanceof Function);
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assertFalse(obj3 instanceof String);
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%HeapObjectVerify(f);
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%HeapObjectVerify(obj3);
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// thisArg is converted to object.
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f = foo.bind(undefined);
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assertEquals([this, 0, undefined], f());
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%HeapObjectVerify(f);
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f = foo.bind(null);
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assertEquals([this, 0, undefined], f());
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%HeapObjectVerify(f);
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f = foo.bind(42);
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assertEquals([Object(42), 0, undefined], f());
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%HeapObjectVerify(f);
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f = foo.bind("foo");
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assertEquals([Object("foo"), 0, undefined], f());
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%HeapObjectVerify(f);
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f = foo.bind(true);
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assertEquals([Object(true), 0, undefined], f());
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%HeapObjectVerify(f);
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// Strict functions don't convert thisArg.
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function soo(x, y, z) {
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"use strict";
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return [this, arguments.length, x];
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}
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var s = soo.bind(undefined);
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assertEquals([undefined, 0, undefined], s());
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%HeapObjectVerify(s);
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s = soo.bind(null);
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assertEquals([null, 0, undefined], s());
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%HeapObjectVerify(s);
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s = soo.bind(42);
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assertEquals([42, 0, undefined], s());
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%HeapObjectVerify(s);
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s = soo.bind("foo");
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assertEquals(["foo", 0, undefined], s());
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%HeapObjectVerify(s);
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s = soo.bind(true);
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assertEquals([true, 0, undefined], s());
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%HeapObjectVerify(s);
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// Test that .arguments and .caller are poisoned according to the ES5 spec.
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// Check that property descriptors are correct (unconfigurable, unenumerable,
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// and both get and set is the ThrowTypeError function).
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//
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// Poisoned accessors are no longer own properties --- get them from the
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// prototype
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var f_proto = Object.getPrototypeOf(f);
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var cdesc = Object.getOwnPropertyDescriptor(f_proto, "caller");
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var adesc = Object.getOwnPropertyDescriptor(f_proto, "arguments");
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assertFalse(cdesc.enumerable);
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assertTrue(cdesc.configurable);
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assertFalse(adesc.enumerable);
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assertTrue(adesc.configurable);
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assertSame(cdesc.get, cdesc.set);
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assertSame(cdesc.get, adesc.get);
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assertSame(cdesc.get, adesc.set);
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assertTrue(cdesc.get instanceof Function);
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assertEquals(0, cdesc.get.length);
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assertThrows(cdesc.get, TypeError);
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assertThrows(function() { return f.caller; }, TypeError);
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assertThrows(function() { f.caller = 42; }, TypeError);
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assertThrows(function() { return f.arguments; }, TypeError);
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assertThrows(function() { f.arguments = 42; }, TypeError);
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// Shouldn't throw. Accessing the functions caller must throw if
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// the caller is strict and the callee isn't. A bound function is built-in,
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// but not considered strict.
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(function foo() { return foo.caller; }).bind()();
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(function TestProtoIsPreserved() {
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function fun() {}
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function proto() {}
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Object.setPrototypeOf(fun, proto);
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var bound = fun.bind({});
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assertEquals(proto, Object.getPrototypeOf(bound));
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%HeapObjectVerify(bound);
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var bound2 = fun.bind({});
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assertTrue(%HaveSameMap(new bound, new bound2));
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%HeapObjectVerify(bound2);
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Object.setPrototypeOf(fun, null);
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bound = Function.prototype.bind.call(fun, {});
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assertEquals(null, Object.getPrototypeOf(bound));
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%HeapObjectVerify(bound);
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})();
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