v8/test/mjsunit/regress/regress-embedded-cons-string.js

// Copyright 2013 the V8 project authors. All rights reserved.
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// Flags: --expose-gc --allow-natives-syntax --concurrent-recompilation
// Flags: --opt --no-always-opt

function test(fun) {
  %PrepareFunctionForOptimization(fun);
  fun();
  fun();
  %DisableOptimizationFinalization();
  %OptimizeFunctionOnNextCall(fun, "concurrent");
  // Kick off recompilation.
  fun();
  // Tenure cons string after compile graph has been created.
  %WaitForBackgroundOptimization();
  gc();
  // In the mean time, concurrent recompiling is still blocked.
  assertUnoptimized(fun);
  // Let concurrent recompilation finish.
  %FinalizeOptimization();
  // Concurrent recompilation eventually finishes, embeds tenured cons string.
  assertOptimized(fun);
  // Visit embedded cons string during mark compact.
  gc();
}

function f() {
  return "abcdefghijklmn" + "123456789";
}

function g() {
  return "abcdefghijklmn\u2603" + "123456789";
}

function h() {
  return "abcdefghijklmn\u2603" + "123456789\u2604";
}

test(f);
test(g);
test(h);