test/mjsunit/debug-backtrace.js

// Copyright 2008 the V8 project authors. All rights reserved.
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// 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.
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//       with the distribution.
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//
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

// Flags: --expose-debug-as debug
// The functions used for testing backtraces. They are at the top to make the
// testing of source line/column easier.
function f(x, y) {
  a=1;
};

var m = function() {
  new f(1);
};

function g() {
  m();
};


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

listenerCalled = false;
exception = false;


function ParsedResponse(json) {
  this.response_ = eval('(' + json + ')');
  this.refs_ = [];
  if (this.response_.refs) {
    for (var i = 0; i < this.response_.refs.length; i++) {
      this.refs_[this.response_.refs[i].handle] = this.response_.refs[i];
    }
  }
}


ParsedResponse.prototype.response = function() {
  return this.response_;
}


ParsedResponse.prototype.body = function() {
  return this.response_.body;
}


ParsedResponse.prototype.lookup = function(handle) {
  return this.refs_[handle];
}


function listener(event, exec_state, event_data, data) {
  try {
    if (event == Debug.DebugEvent.Break) {
      // The expected backtrace is
      // 0: f
      // 1: m
      // 2: g
      // 3: [anonymous]

      var response;
      var backtrace;
      var frame;
      var source;

      // Get the debug command processor.
      var dcp = exec_state.debugCommandProcessor();

      // Get the backtrace.
      var json;
      json = '{"seq":0,"type":"request","command":"backtrace"}'
      var resp = dcp.processDebugJSONRequest(json);
      response = new ParsedResponse(resp);
      backtrace = response.body();
      assertEquals(0, backtrace.fromFrame);
      assertEquals(4, backtrace.toFrame);
      assertEquals(4, backtrace.totalFrames);
      var frames = backtrace.frames;
      assertEquals(4, frames.length);
      for (var i = 0; i < frames.length; i++) {
        assertEquals('frame', frames[i].type);
      }
      assertEquals(0, frames[0].index);
      assertEquals("f", response.lookup(frames[0].func.ref).name);
      assertEquals(1, frames[1].index);
      assertEquals("", response.lookup(frames[1].func.ref).name);
      assertEquals("m", response.lookup(frames[1].func.ref).inferredName);
      assertEquals(2, frames[2].index);
      assertEquals("g", response.lookup(frames[2].func.ref).name);
      assertEquals(3, frames[3].index);
      assertEquals("", response.lookup(frames[3].func.ref).name);

      // Get backtrace with two frames.
      json = '{"seq":0,"type":"request","command":"backtrace","arguments":{"fromFrame":1,"toFrame":3}}'
      response = new ParsedResponse(dcp.processDebugJSONRequest(json));
      backtrace = response.body();
      assertEquals(1, backtrace.fromFrame);
      assertEquals(3, backtrace.toFrame);
      assertEquals(4, backtrace.totalFrames);
      var frames = backtrace.frames;
      assertEquals(2, frames.length);
      for (var i = 0; i < frames.length; i++) {
        assertEquals('frame', frames[i].type);
      }
      assertEquals(1, frames[0].index);
      assertEquals("", response.lookup(frames[0].func.ref).name);
      assertEquals("m", response.lookup(frames[0].func.ref).inferredName);
      assertEquals(2, frames[1].index);
      assertEquals("g", response.lookup(frames[1].func.ref).name);

      // Get backtrace with bottom two frames.
      json = '{"seq":0,"type":"request","command":"backtrace","arguments":{"fromFrame":0,"toFrame":2, "bottom":true}}'
      response = new ParsedResponse(dcp.processDebugJSONRequest(json));
      backtrace = response.body();
      assertEquals(2, backtrace.fromFrame);
      assertEquals(4, backtrace.toFrame);
      assertEquals(4, backtrace.totalFrames);
      var frames = backtrace.frames;
      assertEquals(2, frames.length);
      for (var i = 0; i < frames.length; i++) {
        assertEquals('frame', frames[i].type);
      }
      assertEquals(2, frames[0].index);
      assertEquals("g", response.lookup(frames[0].func.ref).name);
      assertEquals(3, frames[1].index);
      assertEquals("", response.lookup(frames[1].func.ref).name);

      // Get the individual frames.
      json = '{"seq":0,"type":"request","command":"frame"}'
      response = new ParsedResponse(dcp.processDebugJSONRequest(json));
      frame = response.body();
      assertEquals(0, frame.index);
      assertEquals("f", response.lookup(frame.func.ref).name);
      assertTrue(frame.constructCall);
      assertEquals(31, frame.line);
      assertEquals(3, frame.column);
      assertEquals(2, frame.arguments.length);
      assertEquals('x', frame.arguments[0].name);
      assertEquals('number', response.lookup(frame.arguments[0].value.ref).type);
      assertEquals(1, response.lookup(frame.arguments[0].value.ref).value);
      assertEquals('y', frame.arguments[1].name);
      assertEquals('undefined', response.lookup(frame.arguments[1].value.ref).type);

      json = '{"seq":0,"type":"request","command":"frame","arguments":{"number":0}}'
      response = new ParsedResponse(dcp.processDebugJSONRequest(json));
      frame = response.body();
      assertEquals(0, frame.index);
      assertEquals("f", response.lookup(frame.func.ref).name);
      assertEquals(31, frame.line);
      assertEquals(3, frame.column);
      assertEquals(2, frame.arguments.length);
      assertEquals('x', frame.arguments[0].name);
      assertEquals('number', response.lookup(frame.arguments[0].value.ref).type);
      assertEquals(1, response.lookup(frame.arguments[0].value.ref).value);
      assertEquals('y', frame.arguments[1].name);
      assertEquals('undefined', response.lookup(frame.arguments[1].value.ref).type);

      json = '{"seq":0,"type":"request","command":"frame","arguments":{"number":1}}'
      response = new ParsedResponse(dcp.processDebugJSONRequest(json));
      frame = response.body();
      assertEquals(1, frame.index);
      assertEquals("", response.lookup(frame.func.ref).name);
      assertEquals("m", response.lookup(frame.func.ref).inferredName);
      assertFalse(frame.constructCall);
      assertEquals(35, frame.line);
      assertEquals(2, frame.column);
      assertEquals(0, frame.arguments.length);

      json = '{"seq":0,"type":"request","command":"frame","arguments":{"number":3}}'
      response = new ParsedResponse(dcp.processDebugJSONRequest(json));
      frame = response.body();
      assertEquals(3, frame.index);
      assertEquals("", response.lookup(frame.func.ref).name);

      // Source slices for the individual frames (they all refer to this script).
      json = '{"seq":0,"type":"request","command":"source",' +
              '"arguments":{"frame":0,"fromLine":30,"toLine":32}}'
      response = new ParsedResponse(dcp.processDebugJSONRequest(json));
      source = response.body();
      assertEquals("function f(x, y) {", source.source.substring(0, 18));
      assertEquals(30, source.fromLine);
      assertEquals(32, source.toLine);

      json = '{"seq":0,"type":"request","command":"source",' +
              '"arguments":{"frame":1,"fromLine":31,"toLine":32}}'
      response = new ParsedResponse(dcp.processDebugJSONRequest(json));
      source = response.body();
      assertEquals("  a=1;", source.source.substring(0, 6));
      assertEquals(31, source.fromLine);
      assertEquals(32, source.toLine);

      json = '{"seq":0,"type":"request","command":"source",' +
              '"arguments":{"frame":2,"fromLine":35,"toLine":36}}'
      response = new ParsedResponse(dcp.processDebugJSONRequest(json));
      source = response.body();
      assertEquals("  new f(1);", source.source.substring(0, 11));
      assertEquals(35, source.fromLine);
      assertEquals(36, source.toLine);

      // Test line interval way beyond this script will result in an error.
      json = '{"seq":0,"type":"request","command":"source",' +
              '"arguments":{"frame":0,"fromLine":10000,"toLine":20000}}'
      response = new ParsedResponse(dcp.processDebugJSONRequest(json));
      assertFalse(response.response().success);

      // Test without arguments.
      json = '{"seq":0,"type":"request","command":"source"}'
      response = new ParsedResponse(dcp.processDebugJSONRequest(json));
      source = response.body();
      assertEquals(Debug.findScript(f).source, source.source);

      listenerCalled = true;
    }
  } catch (e) {
    exception = e
  };
};

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

// Set a break point and call to invoke the debug event listener.
Debug.setBreakPoint(f, 0, 0);
g();

// Make sure that the debug event listener vas invoked.
assertFalse(exception, "exception in listener");
assertTrue(listenerCalled);