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Diffstat (limited to 'src/3rdparty/v8/test/mjsunit/fast-prototype.js')
-rw-r--r-- | src/3rdparty/v8/test/mjsunit/fast-prototype.js | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/src/3rdparty/v8/test/mjsunit/fast-prototype.js b/src/3rdparty/v8/test/mjsunit/fast-prototype.js new file mode 100644 index 0000000..7fd73a4 --- /dev/null +++ b/src/3rdparty/v8/test/mjsunit/fast-prototype.js @@ -0,0 +1,113 @@ +// Copyright 2012 the V8 project authors. All rights reserved. +// Redistribution and use in source and binary forms, with or without +// modification, are permitted provided that the following conditions are +// met: +// +// * Redistributions of source code must retain the above copyright +// notice, this list of conditions and the following disclaimer. +// * Redistributions in binary form must reproduce the above +// copyright notice, this list of conditions and the following +// disclaimer in the documentation and/or other materials provided +// with the distribution. +// * Neither the name of Google Inc. nor the names of its +// contributors may be used to endorse or promote products derived +// from this software without specific prior written permission. +// +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +// Flags: --allow-natives-syntax + +// Check that objects that are used for prototypes are in the fast mode. + +function Super() { +} + + +function Sub() { +} + + +function AddProps(obj) { + for (var i = 0; i < 26; i++) { + obj["x" + i] = 0; + } +} + + +function DoProtoMagic(proto, set__proto__) { + if (set__proto__) { + (new Sub()).__proto__ = proto; + } else { + Sub.prototype = proto; + } +} + + +function test(use_new, add_first, set__proto__, same_map_as) { + var proto = use_new ? new Super() : {}; + + // New object is fast. + assertTrue(%HasFastProperties(proto)); + + if (add_first) { + AddProps(proto); + // Adding this many properties makes it slow. + assertFalse(%HasFastProperties(proto)); + DoProtoMagic(proto, set__proto__); + // Making it a prototype makes it fast again. + assertTrue(%HasFastProperties(proto)); + } else { + DoProtoMagic(proto, set__proto__); + // Still fast + assertTrue(%HasFastProperties(proto)); + AddProps(proto); + // After we add all those properties it went slow mode again :-( + assertFalse(%HasFastProperties(proto)); + } + if (same_map_as && !add_first) { + assertTrue(%HaveSameMap(same_map_as, proto)); + } + return proto; +} + + +for (var i = 0; i < 4; i++) { + var set__proto__ = ((i & 1) != 0); + var use_new = ((i & 2) != 0); + + test(use_new, true, set__proto__); + + var last = test(use_new, false, set__proto__); + test(use_new, false, set__proto__, last); +} + + +var x = {a: 1, b: 2, c: 3}; +var o = { __proto__: x }; +assertTrue(%HasFastProperties(x)); +for (key in x) { + assertTrue(key == 'a'); + break; +} +delete x.b; +for (key in x) { + assertTrue(key == 'a'); + break; +} +assertFalse(%HasFastProperties(x)); +x.d = 4; +assertFalse(%HasFastProperties(x)); +for (key in x) { + assertTrue(key == 'a'); + break; +} |