v8/test/mjsunit/regress/regress-debug-deopt-while-recompile.js

// Copyright 2013 the V8 project authors. All rights reserved.
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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: --turbo-deoptimization

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("bar").value());
  } catch (e) {
    exception = e;
  };
  listened++;
};

var exception = null;
var listened = 0;

var f = function() {
  var bar = "foo";
  var baz = bar;  // Break point should be here.
  return bar;
}

var g = function() {
  var bar = "foo";
  var baz = bar;  // Break point should be here.
  return bar;
}

f();
f();
g();
g();

// Mark with builtin.
%OptimizeFunctionOnNextCall(f);
if (%IsConcurrentRecompilationSupported()) {
  %OptimizeFunctionOnNextCall(g, "concurrent");
}

// Activate debugger.
Debug.setListener(listener);

 // Set break point.
Debug.setBreakPoint(f, 2, 0);
Debug.setBreakPoint(g, 2, 0);

// Trigger break point.
f();
g();

// Assert that break point is set at expected location.
assertTrue(Debug.showBreakPoints(f).indexOf("[B0]var baz = bar;") > 0);
assertTrue(Debug.showBreakPoints(g).indexOf("[B0]var baz = bar;") > 0);

assertEquals(2, listened);
assertNull(exception);