v8/test/mjsunit/string-natives.js

// Copyright 2012 the V8 project authors. All rights reserved.
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// modification, are permitted provided that the following conditions are
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// Flags: --expose-gc --allow-natives-syntax

function test() {
  var s1 = %NewString(26, true);
  for (i = 0; i < 26; i++) %_OneByteSeqStringSetChar(i, 65, s1);
  assertEquals("AAAAAAAAAAAAAAAAAAAAAAAAAA", s1);
  %_OneByteSeqStringSetChar(25, 66, s1);
  assertEquals("AAAAAAAAAAAAAAAAAAAAAAAAAB", s1);
  for (i = 0; i < 26; i++) %_OneByteSeqStringSetChar(i, i+65, s1);
  assertEquals("ABCDEFGHIJKLMNOPQRSTUVWXYZ", s1);
  s1 = %TruncateString(s1, 13);
  assertEquals("ABCDEFGHIJKLM", s1);

  var s2 = %NewString(26, false);
  for (i = 0; i < 26; i++) %_TwoByteSeqStringSetChar(i, 65, s2);
  assertEquals("AAAAAAAAAAAAAAAAAAAAAAAAAA", s2);
  %_TwoByteSeqStringSetChar(25, 66, s2);
  assertEquals("AAAAAAAAAAAAAAAAAAAAAAAAAB", s2);
  for (i = 0; i < 26; i++) %_TwoByteSeqStringSetChar(i, i+65, s2);
  assertEquals("ABCDEFGHIJKLMNOPQRSTUVWXYZ", s2);
  s2 = %TruncateString(s2, 13);
  assertEquals("ABCDEFGHIJKLM", s2);

  var s3 = %NewString(26, false);
  for (i = 0; i < 26; i++) %_TwoByteSeqStringSetChar(i, i+1000, s3);
  for (i = 0; i < 26; i++) assertEquals(s3[i], String.fromCharCode(i+1000));

  var a = [];
  for (var i = 0; i < 1000; i++) {
    var s = %NewString(10000, i % 2 == 1);
    a.push(s);
  }

  gc();

  for (var i = 0; i < 1000; i++) {
    assertEquals(10000, a[i].length);
    a[i] = %TruncateString(a[i], 5000);
  }

  gc();

  for (var i = 0; i < 1000; i++) {
    assertEquals(5000, a[i].length);
  }
}


test();
test();
%OptimizeFunctionOnNextCall(test);
test();