Whitelist serialized objects wrt MSAN.

src/serialize.cc

Index: src/serialize.cc
diff --git a/src/serialize.cc b/src/serialize.cc
index 887276f9cf0dc1b65e6f90432e14cea0b205e9e3..ae3b3a2b2e24d9b64c7b06bafe779f1e84c74760 100644
--- a/src/serialize.cc
+++ b/src/serialize.cc
@@ -2120,6 +2120,10 @@ int Serializer::ObjectSerializer::OutputRawData(
     }
 
     const char* description = code_object_ ? "Code" : "Byte";
+#ifdef MEMORY_SANITIZER
+    // Object sizes are usually rounded up with uninitialized padding space.
+    MSAN_MEMORY_IS_INITIALIZED(object_start + base, bytes_to_output);
+#endif  // MEMORY_SANITIZER
     sink_->PutRaw(object_start + base, bytes_to_output, description);
     if (code_object_) delete[] object_start;
   }
@@ -2529,6 +2533,7 @@ class Checksum {
 #endif  // V8_HOST_ARCH_64_BIT
     a_ = static_cast<uint32_t>(a);
     b_ = static_cast<uint32_t>(b);
+    printf("%d, %d\n", a_, b_);

[jochen (gone - plz use gerrit), 2015/02/11 13:08:45]

Why is that needed?

[Yang, 2015/02/11 13:24:15]

Ummm.. hehe.. it's not.

   }
 
   bool Check(uint32_t a, uint32_t b) const { return a == a_ && b == b_; }