Correctly resolve local var shadowing a context-allocated var in debugger.

R=ulan@chromium.org
BUG=131994
TEST=regress/regress-131994.js

Review URL: https://chromiumcodereview.appspot.com/10585002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11855 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/runtime.cc

@@ -12105,7 +12105,11 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_DebugEvaluate) {
   Handle<Context> context =
       isolate->factory()->NewFunctionContext(Context::MIN_CONTEXT_SLOTS,
                                              go_between);
-  context->set_extension(*local_scope);
+
+  // Use the materialized local scope in a with context.
+  context =
+      isolate->factory()->NewWithContext(go_between, context, local_scope);
+
   // Copy any with contexts present and chain them in front of this context.
   Handle<Context> frame_context(Context::cast(frame->context()));
   Handle<Context> function_context;

test/mjsunit/regress/regress-131994.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
+
+// Test that a variable in the local scope that shadows a context-allocated
+// variable is correctly resolved when being evaluated in the debugger.
+
+Debug = debug.Debug;
+
+var exception = false;
+
+function listener(event, exec_state, event_data, data) {
+  if (event != Debug.DebugEvent.Break) return;
+  var breakpoint = exec_state.frame(0);
+  try {
+    // Assert correct break point.
+    assertTrue(breakpoint.sourceLineText().indexOf("// Break") > -1);
+    // Assert correct value.
+    assertEquals(3, breakpoint.evaluate('x').value());
+  } catch (e) {
+    exception = e;
+  }
+}
+
+Debug.setListener(listener);
+
+function h() {
+  var x;  // Context-allocated due to g().
+
+  var g = function g() {
+    x = -7;
+  };
+
+  var f = function f() {
+    var x = 3;  // Allocated in the local scope.
+    debugger;  // Break.
+  };
+
+  f();
+}
+
+h();
+
+assertFalse(exception);
+