b20f0968fa
Previously it did two reads of the .toString and .valueOf properties where only one was allowed. Review URL: http://codereview.chromium.org/5950001 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6047 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
105 lines
3.5 KiB
JavaScript
105 lines
3.5 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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// Test the ToPrimitive internal function used by ToNumber/ToString.
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// Does it [[Get]] and [[Call]] the object's toString and valueOf properties
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// correctly. Specifically, does it call [[Get]] only once per property.
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var o1 = { toString: function() { return 42; },
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valueOf: function() { return "37"; } };
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var n1 = Number(o1);
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var s1 = String(o1);
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assertTrue(typeof n1 == "number");
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assertTrue(typeof s1 == "string");
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var trace = [];
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var valueOfValue = 42;
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var toStringValue = "foo";
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function traceValueOf () {
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trace.push("vo");
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return valueOfValue;
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};
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function traceToString() {
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trace.push("ts");
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return toStringValue;
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};
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var valueOfFunc = traceValueOf;
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var toStringFunc = traceToString;
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var ot = { get toString() { trace.push("gts");
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return toStringFunc; },
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get valueOf() { trace.push("gvo");
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return valueOfFunc; }
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};
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var nt = Number(ot);
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assertEquals(42, nt);
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assertEquals(["gvo","vo"], trace);
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trace = [];
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var st = String(ot);
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assertEquals("foo", st);
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assertEquals(["gts","ts"], trace);
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trace = [];
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valueOfValue = ["not primitive"];
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var nt = Number(ot);
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assertEquals(Number("foo"), nt);
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assertEquals(["gvo", "vo", "gts", "ts"], trace);
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trace = [];
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valueOfValue = 42;
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toStringValue = ["not primitive"];
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var st = String(ot);
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assertEquals(String(42), st);
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assertEquals(["gts", "ts", "gvo", "vo"], trace);
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trace = [];
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valueOfValue = ["not primitive"];
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assertThrows("Number(ot)", TypeError);
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assertEquals(["gvo", "vo", "gts", "ts"], trace);
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toStringFunc = "not callable";
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trace = [];
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valueOfValue = 42;
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var st = String(ot);
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assertEquals(String(42), st);
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assertEquals(["gts", "gvo", "vo"], trace);
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valueOfFunc = "not callable";
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trace = [];
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assertThrows("String(ot)", TypeError);
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assertEquals(["gts", "gvo"], trace);
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toStringFunc = traceToString;
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toStringValue = "87";
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trace = [];
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var nt = Number(ot);
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assertEquals(87, nt);
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assertEquals(["gvo", "gts", "ts"], trace);
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