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1 // Copyright 2016 the V8 project authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 // Flags: --allow-natives-syntax | |
6 | |
7 function get_thin_string(a, b) { | |
8 var str = a + b; // Make a ConsString. | |
9 var o = {}; | |
10 o[str]; // Turn it into a ThinString. | |
11 return str; | |
12 } | |
13 | |
14 var str = get_thin_string("foo", "bar"); | |
15 | |
16 var re = /.o+ba./; | |
17 assertEquals(["foobar"], re.exec(str)); | |
18 assertEquals(["foobar"], re.exec(str)); | |
19 assertEquals(["foobar"], re.exec(str)); | |
20 | |
21 function CheckCS() { | |
22 assertEquals("o", str.substring(1, 2)); | |
23 assertEquals("f".charCodeAt(0), str.charCodeAt(0)); | |
24 assertEquals("f", str.split(/oo/)[0]); | |
25 } | |
26 CheckCS(); | |
27 %OptimizeFunctionOnNextCall(CheckCS); | |
28 CheckCS(); | |
29 | |
30 function CheckTF() { | |
31 try {} catch(e) {} // Turbofan. | |
32 assertEquals("o", str.substring(1, 2)); | |
33 assertEquals("f".charCodeAt(0), str.charCodeAt(0)); | |
34 assertEquals("f", str.split(/oo/)[0]); | |
35 } | |
36 CheckTF(); | |
37 %OptimizeFunctionOnNextCall(CheckTF); | |
38 CheckTF(); | |
39 | |
40 // Flat cons strings can point to a thin string. | |
41 | |
42 function get_cons_thin_string(a, b) { | |
43 // Make a ConsString. | |
44 var s = a + b; | |
45 // Flatten it. | |
46 s.endsWith("a"); | |
47 // Internalize the first part. | |
48 var o = {}; | |
49 o[s]; | |
50 return s; | |
51 } | |
52 | |
53 var s = get_cons_thin_string("__________", "@@@@@@@@@@a"); | |
54 s.match(/.*a/); | |
55 assertEquals("________", s.substring(0, 8)); | |
56 | |
57 // Sliced strings can have a thin string as their parent. | |
58 | |
59 function get_sliced_thin_string(a, b) { | |
60 // Make a long thin string. | |
61 var s = a + b; | |
62 // Slice a substring out of it. | |
63 var slice = s.substring(0, 20); | |
64 // Make the original string thin. | |
65 var o = {}; | |
66 o[s]; | |
67 return slice; | |
68 } | |
69 | |
70 var t = get_sliced_thin_string("abcdefghijklmnopqrstuvwxyz", | |
71 "abcdefghijklmnopqrstuvwxyz"); | |
72 assertEquals("abcdefghijklmnopqrst", decodeURI(t)); | |
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