v8/test/mjsunit/debug-stepin-function-call.js

// Copyright 2008 the V8 project authors. All rights reserved.
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//
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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 = null;
var state = 0;

// Simple debug event handler which first time will cause 'step in' action
// to get into g.call and than check that execution is pauesed inside
// function 'g'.
function listener(event, exec_state, event_data, data) {
  try {
    if (event == Debug.DebugEvent.Break) {
      if (state == 0) {
        // Step into f2.call:
        exec_state.prepareStep(Debug.StepAction.StepIn, 2);
        state = 2;
      } else if (state == 2) {
        assertEquals('g', event_data.func().name());
        assertEquals('  return t + 1; // expected line',
                     event_data.sourceLineText());
        state = 3;
      }
    }
  } catch(e) {
    exception = e;
  }
};

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


// Sample functions.
function g(t) {
  return t + 1; // expected line
}

// Test step into function call from a function without local variables.
function call1() {
  debugger;
  g.call(null, 3);
}


// Test step into function call from a function with some local variables.
function call2() {
  var aLocalVar = 'test';
  var anotherLocalVar  = g(aLocalVar) + 's';
  var yetAnotherLocal = 10;
  debugger;
  g.call(null, 3);
}

// Test step into function call which is a part of an expression.
function call3() {
  var alias = g;
  debugger;
  var r = 10 + alias.call(null, 3);
  var aLocalVar = 'test';
  var anotherLocalVar  = g(aLocalVar) + 's';
  var yetAnotherLocal = 10;
}

// Test step into function call from a function with some local variables.
function call4() {
  var alias = g;
  debugger;
  alias.call(null, 3);
  var aLocalVar = 'test';
  var anotherLocalVar  = g(aLocalVar) + 's';
  var yetAnotherLocal = 10;
}

// Test step into function apply from a function without local variables.
function apply1() {
  debugger;
  g.apply(null, [3]);
}


// Test step into function apply from a function with some local variables.
function apply2() {
  var aLocalVar = 'test';
  var anotherLocalVar  = g(aLocalVar) + 's';
  var yetAnotherLocal = 10;
  debugger;
  g.apply(null, [3, 4]);
}

// Test step into function apply which is a part of an expression.
function apply3() {
  var alias = g;
  debugger;
  var r = 10 + alias.apply(null, [3, 'unused arg']);
  var aLocalVar = 'test';
  var anotherLocalVar  = g(aLocalVar) + 's';
  var yetAnotherLocal = 10;
}

// Test step into function apply from a function with some local variables.
function apply4() {
  var alias = g;
  debugger;
  alias.apply(null, [3]);
  var aLocalVar = 'test';
  var anotherLocalVar  = g(aLocalVar) + 's';
  var yetAnotherLocal = 10;
}

var testFunctions =
    [call1, call2, call3, call4, apply1, apply2, apply3, apply4];

for (var i = 0; i < testFunctions.length; i++) {
  state = 0;
  testFunctions[i]();
  assertNull(exception);
  assertEquals(3, state);
}

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