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1 // Copyright 2013 the V8 project authors. All rights reserved. | |
2 // Redistribution and use in source and binary forms, with or without | |
3 // modification, are permitted provided that the following conditions are | |
4 // met: | |
5 // | |
6 // * Redistributions of source code must retain the above copyright | |
7 // notice, this list of conditions and the following disclaimer. | |
8 // * Redistributions in binary form must reproduce the above | |
9 // copyright notice, this list of conditions and the following | |
10 // disclaimer in the documentation and/or other materials provided | |
11 // with the distribution. | |
12 // * Neither the name of Google Inc. nor the names of its | |
13 // contributors may be used to endorse or promote products derived | |
14 // from this software without specific prior written permission. | |
15 // | |
16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
27 | |
28 // Flags: --allow-natives-syntax | |
29 | |
30 function dead1(a, b) { | |
31 var x = %_StringCharFromCode(a); | |
32 return a; // x is dead code | |
33 } | |
34 | |
35 function dead2(a, b) { | |
36 var x = %_StringCharFromCode(a); | |
37 var y = %_StringCharFromCode(b); | |
38 return a; // x and y are both dead | |
39 } | |
40 | |
41 function dead3(a, b) { | |
42 a = a ? 11 : 12; | |
43 b = b ? 13 : 14; | |
44 var x = %_StringCharFromCode(a); | |
45 var y = %_StringCharFromCode(b); | |
46 return a; // x and y are both dead | |
47 } | |
48 | |
49 function test() { | |
50 assertEquals(33, dead1(33, 32)); | |
51 assertEquals(33, dead2(33, 32)); | |
52 assertEquals(11, dead3(33, 32)); | |
53 | |
54 assertEquals(31, dead1(31, 30)); | |
55 assertEquals(31, dead2(31, 30)); | |
56 assertEquals(11, dead3(31, 32)); | |
57 | |
58 assertEquals(0, dead1(0, 30)); | |
59 assertEquals(0, dead2(0, 30)); | |
60 assertEquals(12, dead3(0, 32)); | |
61 | |
62 assertEquals(true, dead1(true, 0)); | |
63 assertEquals(true, dead2(true, 0)); | |
64 assertEquals(11, dead3(true, 0)); | |
65 | |
66 assertEquals("true", dead1("true", 0)); | |
67 assertEquals("true", dead2("true", 0)); | |
68 assertEquals(11, dead3("true", 0)); | |
69 } | |
70 | |
71 test(); | |
72 test(); | |
73 %OptimizeFunctionOnNextCall(dead1); | |
74 %OptimizeFunctionOnNextCall(dead2); | |
75 %OptimizeFunctionOnNextCall(dead3); | |
76 test(); | |
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