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// modification, are permitted provided that the following conditions are
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//
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// Flags: --expose-debug-as debug --allow-natives-syntax
// Flags: --concurrent-recompilation --block-concurrent-recompilation

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

Debug = debug.Debug;

function listener(event, exec_state, event_data, data) {
  if (event != Debug.DebugEvent.Break) return;
  try {
    assertEquals("foo", exec_state.frame(0).evaluate("a").value());
  } catch (e) {
    exception = e;
  };
  listened++;
};

var exception = null;
var listened = 0;

var f = function() {
  var a = "foo";
  var b = a.substring("1");
  [a, b].sort();
  return a;
}

f();
f();
%OptimizeFunctionOnNextCall(f, "concurrent");  // Mark with builtin.
f();                           // Kick off concurrent recompilation.

// After compile graph has been created...
Debug.setListener(listener);   // Activate debugger.
Debug.setBreakPoint(f, 2, 0);  // Force deopt.

// At this point, concurrent recompilation is still being blocked.
assertUnoptimized(f, "no sync");
// Let concurrent recompilation proceed.
%UnblockConcurrentRecompilation();
// Sync with optimization thread.  But no optimized code is installed.
assertUnoptimized(f, "sync");

f();                           // Trigger break point.
assertEquals(1, listened);
assertNull(exception);