src/hotspot/cpu/x86/gc/shared/barrierSetAssembler_x86.cpp

@@ -21,14 +21,16 @@
   * questions.
   *
   */
  
  #include "precompiled.hpp"
+ #include "asm/macroAssembler.inline.hpp"
  #include "classfile/classLoaderData.hpp"
  #include "gc/shared/barrierSet.hpp"
  #include "gc/shared/barrierSetAssembler.hpp"
  #include "gc/shared/barrierSetNMethod.hpp"
+ #include "gc/shared/barrierSetRuntime.hpp"
  #include "gc/shared/collectedHeap.hpp"
  #include "interpreter/interp_masm.hpp"
  #include "memory/universe.hpp"
  #include "runtime/javaThread.hpp"
  #include "runtime/jniHandles.hpp"

@@ -193,10 +195,23 @@
      break;
    default: Unimplemented();
    }
  }
  
+ void BarrierSetAssembler::value_copy(MacroAssembler* masm, DecoratorSet decorators,
+                                      Register src, Register dst, Register value_klass) {
+   // value_copy implementation is fairly complex, and there are not any
+   // "short-cuts" to be made from asm. What there is, appears to have the same
+   // cost in C++, so just "call_VM_leaf" for now rather than maintain hundreds
+   // of hand-rolled instructions...
+   if (decorators & IS_DEST_UNINITIALIZED) {
+     __ call_VM_leaf(CAST_FROM_FN_PTR(address, BarrierSetRuntime::value_copy_is_dest_uninitialized), src, dst, value_klass);
+   } else {
+     __ call_VM_leaf(CAST_FROM_FN_PTR(address, BarrierSetRuntime::value_copy), src, dst, value_klass);
+   }
+ }
+ 
  void BarrierSetAssembler::copy_load_at(MacroAssembler* masm,
                                         DecoratorSet decorators,
                                         BasicType type,
                                         size_t bytes,
                                         Register dst,