Support stepping into CallFunction stubs

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

Index: test/mjsunit/debug-stepin-call-function-stub.js
===================================================================
--- test/mjsunit/debug-stepin-call-function-stub.js	(revision 0)
+++ test/mjsunit/debug-stepin-call-function-stub.js	(revision 0)
@@ -0,0 +1,115 @@
+// Copyright 2009 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
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// 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
+
+var exception = null;
+var state = 0;
+var expected_function_name = null;
+var expected_source_line_text = null;
+var expected_caller_source_line = null;
+var step_in_count = 2;
+
+// 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 f().
+        exec_state.prepareStep(Debug.StepAction.StepIn, step_in_count);
+        state = 2;
+      } else if (state == 2) {
+        assertEquals(expected_source_line_text,
+                     event_data.sourceLineText());
+        assertEquals(expected_function_name, event_data.func().name());
+        state = 3;
+      }
+    }
+  } catch(e) {
+    exception = e;
+  }
+};
+
+// Add the debug event listener.
+Debug.setListener(listener);
+
+
+function g() { 
+   return "s";  // expected line
+}
+
+function testFunction() {
+  var f = g;
+  var s = 1 +f(10);
+}
+
+function g2() { 
+   return "s2";  // expected line
+}
+
+function testFunction2() {
+  var f = g2;
+  var s = 1 +f(10, 20);
+}
+
+// Run three times. First time the function will be compiled lazily,
+// second time cached version will be used.
+for (var i = 0; i < 3; i++) {
+  state = 0;
+  expected_function_name = 'g';
+  expected_source_line_text = '   return "s";  // expected line';
+  step_in_count = 2;
+  // Set a break point and call to invoke the debug event listener.
+  Debug.setBreakPoint(testFunction, 1, 0);
+  testFunction();
+  assertNull(exception);
+  assertEquals(3, state);
+}
+
+// Test stepping into function call when a breakpoint is set at the place
+// of call. Use different pair of functions so that g2 is compiled lazily.
+// Run twice: first time function will be compiled lazily, second time
+// cached version will be used.
+for (var i = 0; i < 3; i++) {
+  state = 0;
+  expected_function_name = 'g2';
+  expected_source_line_text = '   return "s2";  // expected line';
+  step_in_count = 1;
+  // Set a break point and call to invoke the debug event listener.
+  Debug.setBreakPoint(testFunction2, 2, 0);
+  testFunction2();
+  assertNull(exception);
+  assertEquals(3, state);
+}
+
+
+// Get rid of the debug event listener.
+Debug.setListener(null);