Enable lazy compilation for non-trivial outer contexts.

test/mjsunit/debug-script-breakpoints-nested.js

+// Copyright 2012 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
+
+// Simple debug event handler which just counts the number of break points hit.
+var break_point_hit_count = 0;
+
+function listener(event, exec_state, event_data, data) {
+  if (event == Debug.DebugEvent.Break) {
+    break_point_hit_count++;
+  }
+};
+
+// Add the debug event listener.
+Debug.setListener(listener);
+
+eval(
+  "var inner;\n" +
+  "function outer() {\n" +    // Non-trivial outer closure.
+  "  var x = 23;\n" +
+  "  function a() {\n" +
+  "    function b() {\n" +

[ulan, 2012/06/12 15:07:23]

Consider adding more local variables.

[Michael Starzinger, 2012/06/12 15:54:05]

Done.

+  "      function c() {\n" +
+  "        return x;\n" +     // Breakpoint line ( #6 )
+  "      }\n" +
+  "      inner = c;\n" +
+  "      return c();\n" +
+  "    }\n" +
+  "    return b();\n" +
+  "  }\n" +
+  "  return a();\n" +
+  "}"
+);
+
+var script = Debug.findScript(outer);
+
+// The debugger triggers compilation of inner closures.
+assertEquals(0, Debug.scriptBreakPoints().length);
+var sbp = Debug.setScriptBreakPointById(script.id, 6);
+assertEquals(1, Debug.scriptBreakPoints().length);
+
+// The compiled outer closure should behave correctly.
+assertEquals(23, outer());
+assertEquals(1, break_point_hit_count);
+
+// The compiled inner closure should behave correctly.
+assertEquals(23, inner());
+assertEquals(2, break_point_hit_count);
+
+// Remove script break point.
+assertEquals(1, Debug.scriptBreakPoints().length);
+Debug.clearBreakPoint(sbp);
+assertEquals(0, Debug.scriptBreakPoints().length);