debug-stepin-constructor.js

Google浏览器V8内核代码

// Copyright 2008 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
//       copyright notice, this list of conditions and the following
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//       with the distribution.
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//       from this software without specific prior written permission.
//
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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

// Simple debug event handler which counts the number of breaks hit and steps.
var break_break_point_hit_count = 0;
function listener(event, exec_state, event_data, data) {
  if (event == Debug.DebugEvent.Break) {
    break_break_point_hit_count++;
    // Continue stepping until returned to bottom frame.
    if (exec_state.frameCount() > 1) {
      exec_state.prepareStep(Debug.StepAction.StepIn);
    }
    
    // Test that there is a script.
    assertTrue(typeof(event_data.func().script()) == 'object');
  }
};

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

// Test step into constructor with simple constructor.
function X() {
}

function f() {
  debugger;
  new X();
};

break_break_point_hit_count = 0;
f();
assertEquals(5, break_break_point_hit_count);

// Test step into constructor with builtin constructor.
function g() {
  debugger;
  new Date();
};

break_break_point_hit_count = 0;
g();
assertEquals(5, break_break_point_hit_count);

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