v8/test/mjsunit/regress/regress-regexp-codeflush.js

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// Flags: --gc-global

// Regression test for regexp that has multiple matches and which
// internally calls RegExpImpl::IrregexpExecOnce more than once without
// ensuring that the regexp is compiled.
// This can create a crash if the code was exchanged with the sweep
// generation (for code flushing support) in GC during the matching.

var re = new RegExp('(s)', "g");

function foo() {
  return "42";
}

// Run enough times to get a number of GC's (all mark sweep because of the
// --gc_global) flag.
for ( var i = 0; i < 10; i++) {
  // Make a long string with plenty of matches for re.
  var x = "s foo s bar s foo s bar s";
  x = x + x;
  x = x + x;
  x = x + x;
  x = x + x;
  x = x + x;
  x = x + x;
  x = x + x;
  x.replace(re, foo);
}