Annotate V8 for MemorySanitizer.

src/frames-inl.h

 // 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
@@ skipping 12 matching lines @@
 // 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.
 
 #ifndef V8_FRAMES_INL_H_
 #define V8_FRAMES_INL_H_
 
 #include "frames.h"
 #include "isolate.h"
+#include "msan.h"
 #include "v8memory.h"
 
 #if V8_TARGET_ARCH_IA32
 #include "ia32/frames-ia32.h"
 #elif V8_TARGET_ARCH_X64
 #include "x64/frames-x64.h"
 #elif V8_TARGET_ARCH_ARM
 #include "arm/frames-arm.h"
 #elif V8_TARGET_ARCH_MIPS
 #include "mips/frames-mips.h"
@@ skipping 87 matching lines @@
   return GetContainingCode(isolate(), pc());
 }
 
 
 inline Code* StackFrame::GetContainingCode(Isolate* isolate, Address pc) {
   return isolate->inner_pointer_to_code_cache()->GetCacheEntry(pc)->code;
 }
 
 
 inline Address* StackFrame::ResolveReturnAddressLocation(Address* pc_address) {
+  Address *a;
   if (return_address_location_resolver_ == NULL) {
-    return pc_address;
+    a = pc_address;
   } else {
-    return reinterpret_cast<Address*>(
+    a = reinterpret_cast<Address*>(
         return_address_location_resolver_(
             reinterpret_cast<uintptr_t>(pc_address)));
   }
+  MSAN_MEMORY_IS_INITIALIZED(a, sizeof(*a));
+  return a;
 }
 
 
 inline EntryFrame::EntryFrame(StackFrameIteratorBase* iterator)
     : StackFrame(iterator) {
 }
 
 
 inline EntryConstructFrame::EntryConstructFrame(
     StackFrameIteratorBase* iterator)
@@ skipping 180 matching lines @@
 inline StackFrame* SafeStackFrameIterator::frame() const {
   ASSERT(!done());
   ASSERT(frame_->is_java_script() || frame_->is_exit());
   return frame_;
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_FRAMES_INL_H_