test/mjsunit/debug-liveedit-check-stack.js

// Copyright 2010 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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// 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

unique_id = 1;

function TestBase(name) {
  print("TestBase constructor: " + name);

  this.ChooseAnimal = eval(
      "/* " + unique_id + "*/\n" +
      "(function ChooseAnimal(callback) {\n " +
      "  callback();\n" +
      "  return 'Cat';\n" +
      "})\n"
  );
  // Prevents eval script caching.
  unique_id++;

  var script = Debug.findScript(this.ChooseAnimal);

  var orig_animal = "'Cat'";
  var patch_pos = script.source.indexOf(orig_animal);
  var new_animal_patch = "'Capybara'";

  var got_exception = false;
  var successfully_changed = false;

  // Should be called from Debug context.
  this.ScriptChanger = function() {
    assertEquals(false, successfully_changed, "applying patch second time");
    // Runs in debugger context.
    var change_log = new Array();
    try {
      Debug.LiveEdit.TestApi.ApplySingleChunkPatch(script, patch_pos, orig_animal.length, new_animal_patch, change_log);
    } finally {
      print("Change log: " + JSON.stringify(change_log) + "\n");
    }
    successfully_changed = true;
  };
}

function Noop() {}

function WrapInCatcher(f, holder) {
  return function() {
    delete holder[0];
    try {
      f();
    } catch (e) {
      if (e instanceof Debug.LiveEdit.Failure) {
        holder[0] = e;
      } else {
        throw e;
      }
    }
  };
}

function WrapInNativeCall(f) {
  return function() {
    return Debug.ExecuteInDebugContext(f, true);
  };
}

function WrapInDebuggerCall(f) {
  return function() {
    return Debug.ExecuteInDebugContext(f, false);
  };
}

function WrapInRestartProof(f) {
  var already_called = false;
  return function() {
    if (already_called) {
      return;
    }
    already_called = true;
    f();
  }
}

function WrapInConstructor(f) {
  return function() {
    return new function() {
      f();
    };
  }
}


// A series of tests. In each test we call ChooseAnimal function that calls
// a callback that attempts to modify the function on the fly.

test = new TestBase("First test ChooseAnimal without edit");
assertEquals("Cat", test.ChooseAnimal(Noop));

test = new TestBase("Test without function on stack");
test.ScriptChanger();
assertEquals("Capybara", test.ChooseAnimal(Noop));

test = new TestBase("Test with function on stack");
assertEquals("Capybara", test.ChooseAnimal(WrapInDebuggerCall(WrapInRestartProof(test.ScriptChanger))));


test = new TestBase("Test with function on stack and with constructor frame");
assertEquals("Capybara", test.ChooseAnimal(WrapInConstructor(WrapInDebuggerCall(WrapInRestartProof(test.ScriptChanger)))));

test = new TestBase("Test with C++ frame above ChooseAnimal frame");
exception_holder = {};
assertEquals("Cat", test.ChooseAnimal(WrapInNativeCall(WrapInDebuggerCall(WrapInCatcher(test.ScriptChanger, exception_holder)))));
assertTrue(!!exception_holder[0]);