v8/test/mjsunit/debug-compile-event.js

// Copyright 2009 the V8 project authors. All rights reserved.
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// modification, are permitted provided that the following conditions are
// met:
//
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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 being compiled.
var source_count = 0;  // Total number of scources compiled.
var host_compilations = 0;  // Number of scources compiled through the API.
var eval_compilations = 0;  // Number of scources compiled through eval.
var json_compilations = 0;  // Number of scources compiled through JSON.parse.


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++;
        switch (event_data.script().compilationType()) {
          case Debug.ScriptCompilationType.Host:
            host_compilations++;
            break;
          case Debug.ScriptCompilationType.Eval:
            eval_compilations++;
            break;
          case Debug.ScriptCompilationType.JSON:
            json_compilations++;
            break;
        }
      }

      // 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 if (current_source.indexOf('JSON.parse') == 0) {
        // For JSON the JSON source will be in parentheses.
        var s = event_data.script().source();
        if (s[0] == '(') {
          s = s.substring(1, s.length - 2);
        }
        assertTrue(current_source.indexOf(s) >= 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.
compileSource('JSON.parse(\'{"a":1,"b":2}\')');
source_count++;  // Using JSON.parse 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 (no compilation through the API as all
// source compiled through eval except for one JSON.parse call).
assertEquals(source_count, after_compile_count);
assertEquals(0, host_compilations);
assertEquals(source_count - 1, eval_compilations);
assertEquals(1, json_compilations);

Debug.setListener(null);