Support stepping out for recursive functions

test/mjsunit/debug-stepout-recursive-function.js

+// 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 step_out_count = 1;
+
+// Simple debug event handler which counts the number of breaks hit and steps.
+var break_point_hit_count = 0;
+function listener(event, exec_state, event_data, data) {
+  try {
+    if (event == Debug.DebugEvent.Break) {
+      break_point_hit_count++;
+      // Continue stepping until returned to bottom frame.
+      if (exec_state.frameCount() > 1) {
+        exec_state.prepareStep(Debug.StepAction.StepOut, step_out_count);
+      }
+
+    }
+  } catch(e) {
+    exception = e;
+  }
+
+};
+
+function BeginTest(name) {
+  test_name = name;
+  break_point_hit_count = 0;
+  exception = null;
+}
+
+function EndTest(expected_break_point_hit_count) {
+  assertEquals(expected_break_point_hit_count, break_point_hit_count, test_name);
+  assertNull(exception, test_name);
+  test_name = null;
+}
+
+// Add the debug event listener.
+Debug.setListener(listener);
+
+
+var shouldBreak = null;
+function fact(x) {
+  if (shouldBreak(x)) {
+    debugger;
+  }
+  if (x < 2) {
+    return 1;
+  } else {
+    return x*fact(x-1);
+  }
+}
+
+BeginTest('Test 1');
+shouldBreak = function(x) { return x == 3; };
+step_out_count = 1;
+fact(3);
+EndTest(2);
+
+BeginTest('Test 2');
+shouldBreak = function(x) { return x == 2; };
+step_out_count = 1;
+fact(3);
+EndTest(3);
+
+BeginTest('Test 3');
+shouldBreak = function(x) { return x == 1; };
+step_out_count = 2;
+fact(3);
+EndTest(2);
+
+BeginTest('Test 4');
+shouldBreak = function(x) { print(x); return x == 1 || x == 3; };
+step_out_count = 2;
+fact(3);
+EndTest(3);
+
+// Get rid of the debug event listener.
+Debug.setListener(null);