Add support for IncrementCounter in Hydrogen.

src/ia32/lithium-ia32.cc

 // 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 2128 matching lines @@
   Representation r = instr->representation();
   if (r.IsSmi()) {
     return DefineAsRegister(new(zone()) LConstantS);
   } else if (r.IsInteger32()) {
     return DefineAsRegister(new(zone()) LConstantI);
   } else if (r.IsDouble()) {
     double value = instr->DoubleValue();
     bool value_is_zero = BitCast<uint64_t, double>(value) == 0;
     LOperand* temp = value_is_zero ? NULL : TempRegister();
     return DefineAsRegister(new(zone()) LConstantD(temp));
+  } else if (r.IsExternal()) {
+    return DefineAsRegister(new(zone()) LConstantE);
   } else if (r.IsTagged()) {
     return DefineAsRegister(new(zone()) LConstantT);
   } else {
     UNREACHABLE();
     return NULL;
   }
 }
 
 
 LInstruction* LChunkBuilder::DoLoadGlobalCell(HLoadGlobalCell* instr) {
@@ skipping 56 matching lines @@
   } else {
     value = UseRegister(instr->value());
     temp = NULL;
   }
   LInstruction* result = new(zone()) LStoreContextSlot(context, value, temp);
   return instr->RequiresHoleCheck() ? AssignEnvironment(result) : result;
 }
 
 
 LInstruction* LChunkBuilder::DoLoadNamedField(HLoadNamedField* instr) {
-  LOperand* obj = UseRegisterAtStart(instr->object());
+  LOperand* obj = (instr->access().IsExternalMemory() &&
+                   instr->access().offset() == 0)
+      ? UseRegisterOrConstantAtStart(instr->object())
+      : UseRegisterAtStart(instr->object());
   return DefineAsRegister(new(zone()) LLoadNamedField(obj));
 }
 
 
 LInstruction* LChunkBuilder::DoLoadNamedFieldPolymorphic(
     HLoadNamedFieldPolymorphic* instr) {
   ASSERT(instr->representation().IsTagged());
   if (instr->need_generic()) {
     LOperand* context = UseFixed(instr->context(), esi);
     LOperand* obj = UseFixed(instr->object(), edx);
@@ skipping 193 matching lines @@
   LOperand* object = UseRegister(instr->object());
   LOperand* temp = TempRegister();
   LTrapAllocationMemento* result =
       new(zone()) LTrapAllocationMemento(object, temp);
   return AssignEnvironment(result);
 }
 
 
 LInstruction* LChunkBuilder::DoStoreNamedField(HStoreNamedField* instr) {
   bool is_in_object = instr->access().IsInobject();
+  bool is_external_location = instr->access().IsExternalMemory() &&
+      instr->access().offset() == 0;
   bool needs_write_barrier = instr->NeedsWriteBarrier();
   bool needs_write_barrier_for_map = !instr->transition().is_null() &&
       instr->NeedsWriteBarrierForMap();
 
   LOperand* obj;
   if (needs_write_barrier) {
     obj = is_in_object
         ? UseRegister(instr->object())
         : UseTempRegister(instr->object());
+  } else if (is_external_location) {
+    ASSERT(!is_in_object);
+    ASSERT(!needs_write_barrier);
+    ASSERT(!needs_write_barrier_for_map);
+    obj = UseRegisterOrConstant(instr->object());
   } else {
     obj = needs_write_barrier_for_map
         ? UseRegister(instr->object())
         : UseRegisterAtStart(instr->object());
   }
 
   bool can_be_constant = instr->value()->IsConstant() &&
       HConstant::cast(instr->value())->NotInNewSpace() &&
       !(FLAG_track_double_fields && instr->field_representation().IsDouble());
 
@@ skipping 307 matching lines @@
 LInstruction* LChunkBuilder::DoLoadFieldByIndex(HLoadFieldByIndex* instr) {
   LOperand* object = UseRegister(instr->object());
   LOperand* index = UseTempRegister(instr->index());
   return DefineSameAsFirst(new(zone()) LLoadFieldByIndex(object, index));
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32