test/mjsunit/debug-compile-event.js

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// Flags: --expose-debug-as debug
// Get the Debug object exposed from the debug context global object.
Debug = debug.Debug

var exception = false;  // Exception in debug event listener.
var before_compile_count = 0;
var after_compile_count = 0;
var current_source = '';  // Current source compiled.
var source_count = 0;  // Total number of scource sompiled.


function compileSource(source) {
  current_source = source;
  eval(current_source);
  source_count++;
}


function listener(event, exec_state, event_data, data) {
  try {
    if (event == Debug.DebugEvent.BeforeCompile ||
        event == Debug.DebugEvent.AfterCompile) {
      // Count the events.
      if (event == Debug.DebugEvent.BeforeCompile) {
        before_compile_count++;
      } else {
        after_compile_count++;
      }
      
      // If the compiled source contains 'eval' there will be additional compile
      // events for the source inside eval.
      if (current_source.indexOf('eval') == 0) {
        // For source with 'eval' there will be compile events with substrings
        // as well as with with the exact source.
        assertTrue(current_source.indexOf(event_data.script().source()) >= 0);
      } else {
        // For source without 'eval' there will be a compile events with the
        // exact source.
        assertEquals(current_source, event_data.script().source());
      }
      // Check that script context is included into the event message.
      var json = event_data.toJSONProtocol();
      var msg = eval('(' + json + ')');
      assertTrue('context' in msg.body.script);
    }
  } catch (e) {
    exception = e
  }
};


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

// Compile different sources.
compileSource('a=1');
compileSource('function(){}');
compileSource('eval("a=2")');
source_count++;  // Using eval causes additional compilation event.
compileSource('eval("eval(\'function(){return a;}\')")');
source_count += 2;  // Using eval causes additional compilation event.

// Make sure that the debug event listener was invoked.
assertFalse(exception, "exception in listener")

// Number of before and after compile events should be the same.
assertEquals(before_compile_count, after_compile_count);

// Check the actual number of events.
assertEquals(source_count, after_compile_count);

Debug.setListener(null);