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

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// Flags: --fold-constants --nodead-code-elimination
// Flags: --expose-gc --allow-natives-syntax
// Flags: --concurrent-recompilation --block-concurrent-recompilation

if (!%IsConcurrentRecompilationSupported()) {
  print("Concurrent recompilation is disabled. Skipping this test.");
  quit();
}

function test(fun) {
  fun();
  fun();
  // Mark for concurrent optimization.
  %OptimizeFunctionOnNextCall(fun, "concurrent");
  // Kick off recompilation.
  fun();
  // Tenure cons string after compile graph has been created.
  gc();
  // In the mean time, concurrent recompiling is still blocked.
  assertUnoptimized(fun, "no sync");
  // Let concurrent recompilation proceed.
  %UnblockConcurrentRecompilation();
  // Concurrent recompilation eventually finishes, embeds tenured cons string.
  assertOptimized(fun, "sync");
  // 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);