Provide baseline for experimental GC implementation.

src/x64/full-codegen-x64.cc

 // Copyright 2010 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 98 matching lines @@
     for (int i = 0; i < num_parameters; i++) {
       Slot* slot = scope()->parameter(i)->AsSlot();
       if (slot != NULL && slot->type() == Slot::CONTEXT) {
         int parameter_offset = StandardFrameConstants::kCallerSPOffset +
             (num_parameters - 1 - i) * kPointerSize;
         // Load parameter from stack.
         __ movq(rax, Operand(rbp, parameter_offset));
         // Store it in the context.
         int context_offset = Context::SlotOffset(slot->index());
         __ movq(Operand(rsi, context_offset), rax);
+#ifdef ENABLE_CARDMARKING_WRITE_BARRIER
         // Update the write barrier. This clobbers all involved
         // registers, so we have use a third register to avoid
         // clobbering rsi.
         __ movq(rcx, rsi);
         __ RecordWrite(rcx, context_offset, rax, rbx);
+#endif
       }
     }
   }
 
   // Possibly allocate an arguments object.
   Variable* arguments = scope()->arguments();
   if (arguments != NULL) {
     // Arguments object must be allocated after the context object, in
     // case the "arguments" or ".arguments" variables are in the context.
     Comment cmnt(masm_, "[ Allocate arguments object");
@@ skipping 397 matching lines @@
 
 
 void FullCodeGenerator::Move(Slot* dst,
                              Register src,
                              Register scratch1,
                              Register scratch2) {
   ASSERT(dst->type() != Slot::LOOKUP);  // Not yet implemented.
   ASSERT(!scratch1.is(src) && !scratch2.is(src));
   MemOperand location = EmitSlotSearch(dst, scratch1);
   __ movq(location, src);
+#ifdef ENABLE_CARDMARKING_WRITE_BARRIER
   // Emit the write barrier code if the location is in the heap.
   if (dst->type() == Slot::CONTEXT) {
     int offset = FixedArray::kHeaderSize + dst->index() * kPointerSize;
     __ RecordWrite(scratch1, offset, src, scratch2);
   }
+#endif
 }
 
 
 void FullCodeGenerator::PrepareForBailoutBeforeSplit(State state,
                                                      bool should_normalize,
                                                      Label* if_true,
                                                      Label* if_false) {
 }
 
 
@@ skipping 30 matching lines @@
           __ cmpq(rbx, rsi);
           __ Check(equal, "Unexpected declaration in current context.");
         }
         if (mode == Variable::CONST) {
           __ LoadRoot(kScratchRegister, Heap::kTheHoleValueRootIndex);
           __ movq(ContextOperand(rsi, slot->index()), kScratchRegister);
           // No write barrier since the hole value is in old space.
         } else if (function != NULL) {
           VisitForAccumulatorValue(function);
           __ movq(ContextOperand(rsi, slot->index()), result_register());
+#ifdef ENABLE_CARDMARKING_WRITE_BARRIER
           int offset = Context::SlotOffset(slot->index());
           __ movq(rbx, rsi);
           __ RecordWrite(rbx, offset, result_register(), rcx);
+#endif
         }
         break;
 
       case Slot::LOOKUP: {
         __ push(rsi);
         __ Push(variable->name());
         // Declaration nodes are always introduced in one of two modes.
         ASSERT(mode == Variable::VAR || mode == Variable::CONST);
         PropertyAttributes attr = (mode == Variable::VAR) ? NONE : READ_ONLY;
         __ Push(Smi::FromInt(attr));
@@ skipping 688 matching lines @@
       result_saved = true;
     }
     VisitForAccumulatorValue(subexpr);
 
     // Store the subexpression value in the array's elements.
     __ movq(rbx, Operand(rsp, 0));  // Copy of array literal.
     __ movq(rbx, FieldOperand(rbx, JSObject::kElementsOffset));
     int offset = FixedArray::kHeaderSize + (i * kPointerSize);
     __ movq(FieldOperand(rbx, offset), result_register());
 
+#ifdef ENABLE_CARDMARKING_WRITE_BARRIER
     // Update the write barrier for the array store.
     __ RecordWrite(rbx, offset, result_register(), rcx);
+#endif
   }
 
   if (result_saved) {
     context()->PlugTOS();
   } else {
     context()->Plug(rax);
   }
 }
 
 
@@ skipping 295 matching lines @@
       case Slot::CONTEXT: {
         MemOperand target = EmitSlotSearch(slot, rcx);
         if (op == Token::INIT_CONST) {
           // Detect const reinitialization by checking for the hole value.
           __ movq(rdx, target);
           __ CompareRoot(rdx, Heap::kTheHoleValueRootIndex);
           __ j(not_equal, &done);
         }
         // Perform the assignment and issue the write barrier.
         __ movq(target, rax);
+
+#ifdef ENABLE_CARDMARKING_WRITE_BARRIER
         // The value of the assignment is in rax.  RecordWrite clobbers its
         // register arguments.
         __ movq(rdx, rax);
         int offset = FixedArray::kHeaderSize + slot->index() * kPointerSize;
         __ RecordWrite(rcx, offset, rdx, rbx);
+#endif
         break;
       }
 
       case Slot::LOOKUP:
         // Call the runtime for the assignment.  The runtime will ignore
         // const reinitialization.
         __ push(rax);  // Value.
         __ push(rsi);  // Context.
         __ Push(var->name());
         if (op == Token::INIT_CONST) {
@@ skipping 824 matching lines @@
   Label done;
   // If the object is a smi, return the value.
   __ JumpIfSmi(rbx, &done);
 
   // If the object is not a value type, return the value.
   __ CmpObjectType(rbx, JS_VALUE_TYPE, rcx);
   __ j(not_equal, &done);
 
   // Store the value.
   __ movq(FieldOperand(rbx, JSValue::kValueOffset), rax);
+#ifdef ENABLE_CARDMARKING_WRITE_BARRIER
   // Update the write barrier.  Save the value as it will be
   // overwritten by the write barrier code and is needed afterward.
   __ movq(rdx, rax);
   __ RecordWrite(rbx, JSValue::kValueOffset, rdx, rcx);
+#endif
 
   __ bind(&done);
   context()->Plug(rax);
 }
 
 
 void FullCodeGenerator::EmitNumberToString(ZoneList<Expression*>* args) {
   ASSERT_EQ(args->length(), 1);
 
   // Load the argument on the stack and call the stub.
@@ skipping 1029 matching lines @@
   __ ret(0);
 }
 
 
 #undef __
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64