Fix deoptimizer for shared optimized code.

The deoptimizer searched the stack for activations of the same function to
determine whether to trigger lazy deopting. Since we share optimized code we
actually need to search for activations of the same code (but potentially
different functions).

R=jkummerow@chromium.org
BUG=chromium:147475
TEST=mjsunit/regress/regress-crbug-147475

Review URL: https://chromiumcodereview.appspot.com/10917162

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12473 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/runtime.cc

@@ -8033,11 +8033,13 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_NotifyDeoptimized) {
     return isolate->heap()->undefined_value();
   }
 
-  // Find other optimized activations of the function.
+  // Find other optimized activations of the function or functions that
+  // share the same optimized code.
   bool has_other_activations = false;
   while (!it.done()) {
     JavaScriptFrame* frame = it.frame();
-    if (frame->is_optimized() && frame->function() == *function) {
+    JSFunction* other_function = JSFunction::cast(frame->function());
+    if (frame->is_optimized() && other_function->code() == function->code()) {
       has_other_activations = true;
       break;
     }

test/mjsunit/regress/regress-crbug-147475.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: --allow-natives-syntax
+
+function worker1(ignored) {
+  return 100;
+}
+
+function factory(worker) {
+  return function(call_depth) {
+    if (call_depth == 0) return 10;
+    return 1 + worker(call_depth - 1);
+  }
+}
+
+var f1 = factory(worker1);
+var f2 = factory(f1);
+assertEquals(11, f2(1));
+%OptimizeFunctionOnNextCall(f1);
+assertEquals(10, f1(0));
+%OptimizeFunctionOnNextCall(f2);
+assertEquals(102, f2(2));
+assertEquals(102, f2(2));