v8/test/mjsunit/debug-break-inline.js

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// Flags: --expose-debug-as debug --allow-natives-syntax

// This test tests that deoptimization due to debug breaks works for
// inlined functions where the full-code is generated before the
// debugger is attached.
//
//See http://code.google.com/p/chromium/issues/detail?id=105375

// Get the Debug object exposed from the debug context global object.
Debug = debug.Debug;

var count = 0;
var break_count = 0;

// Debug event listener which sets a breakpoint first time it is hit
// and otherwise counts break points hit and checks that the expected
// state is reached.
function listener(event, exec_state, event_data, data) {
  if (event == Debug.DebugEvent.Break) {
    break_count++;
    if (break_count == 1) {
      Debug.setBreakPoint(g, 3);

      for (var i = 0; i < exec_state.frameCount(); i++) {
        var frame = exec_state.frame(i);
        // When function f is optimized (1 means YES, see runtime.cc) we
        // expect an optimized frame for f and g.
        if (%GetOptimizationStatus(f) == 1) {
          if (i == 1) {
            assertTrue(frame.isOptimizedFrame());
            assertTrue(frame.isInlinedFrame());
            assertEquals(4 - i, frame.inlinedFrameIndex());
          } else if (i == 2) {
            assertTrue(frame.isOptimizedFrame());
            assertFalse(frame.isInlinedFrame());
          } else {
            assertFalse(frame.isOptimizedFrame());
            assertFalse(frame.isInlinedFrame());
          }
        }
      }
    }
  }
}

function f() {
  g();
}

function g() {
  count++;
  h();
  var b = 1;  // Break point is set here.
}

function h() {
  debugger;
}

f();f();f();
%OptimizeFunctionOnNextCall(f);
f();

// Add the debug event listener.
Debug.setListener(listener);

f();

assertEquals(5, count);
assertEquals(2, break_count);

// Get rid of the debug event listener.
Debug.setListener(null);