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src/share/vm/opto/stringopts.cpp

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@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 2009, 2015, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2009, 2016, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.

@@ -1956,10 +1956,21 @@
     }
 
     // Initialize the string
     kit.store_String_value(kit.control(), result, dst_array);
     kit.store_String_coder(kit.control(), result, coder);
+
+    // Do not let stores that initialize this object be reordered with
+    // a subsequent store that would make this object accessible by
+    // other threads.
+    // Record what AllocateNode this StoreStore protects so that
+    // escape analysis can go from the MemBarStoreStoreNode to the
+    // AllocateNode and eliminate the MemBarStoreStoreNode if possible
+    // based on the escape status of the AllocateNode.
+    AllocateNode* alloc = AllocateNode::Ideal_allocation(result, _gvn);
+    assert(alloc != NULL, "should be newly allocated");
+    kit.insert_mem_bar(Op_MemBarStoreStore, alloc->proj_out(AllocateNode::RawAddress));
   } else {
     result = C->top();
   }
   // hook up the outgoing control and result
   kit.replace_call(sc->end(), result);
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