New class for Date objects: caches individual date components.

src/x64/lithium-codegen-x64.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 1199 matching lines @@
 
   // If the object is not a value type, return the object.
   __ CmpObjectType(input, JS_VALUE_TYPE, kScratchRegister);
   __ j(not_equal, &done, Label::kNear);
   __ movq(result, FieldOperand(input, JSValue::kValueOffset));
 
   __ bind(&done);
 }
 
 
+void LCodeGen::DoDateField(LDateField* instr) {
+  Register input = ToRegister(instr->InputAt(0));
+  Register result = ToRegister(instr->result());
+  ASSERT(input.is(result));
+
+#ifdef DEBUG
+  __ AbortIfSmi(input);
+  __ CmpObjectType(input, JS_DATE_TYPE, kScratchRegister);
+  __ Assert(equal, "Trying to get date field from non-date.");
+#endif
+
+  __ movq(result, FieldOperand(input,
+                      JSDate::kValueOffset + kPointerSize * instr->index()));
+}
+
+
+void LCodeGen::DoSetDateField(LSetDateField* instr) {
+  Register date = ToRegister(instr->InputAt(0));
+  Register value = ToRegister(instr->InputAt(1));
+  Register result = ToRegister(instr->result());
+  int index = instr->index();
+
+#ifdef DEBUG
+  __ AbortIfSmi(date);
+  __ CmpObjectType(date, JS_DATE_TYPE, kScratchRegister);
+  __ Assert(equal, "Trying to get date field from non-date.");
+#endif
+
+  __ movq(FieldOperand(date, JSDate::kValueOffset + kPointerSize * index),
+          value);
+  // Caches can only be smi or NaN, so we can skip the write barrier for them.
+  if (index < JSDate::kFirstBarrierFree) {
+    // Update the write barrier.  Save the value as it will be
+    // overwritten by the write barrier code and is needed afterward.
+    __ movq(result, value);
+    __ RecordWriteField(date, JSDate::kValueOffset + kPointerSize * index,
+                        value, kScratchRegister, kDontSaveFPRegs);
+  }
+}
+
+
 void LCodeGen::DoBitNotI(LBitNotI* instr) {
   LOperand* input = instr->InputAt(0);
   ASSERT(input->Equals(instr->result()));
   __ not_(ToRegister(input));
 }
 
 
 void LCodeGen::DoThrow(LThrow* instr) {
   __ push(ToRegister(instr->InputAt(0)));
   CallRuntime(Runtime::kThrow, 1, instr);
@@ skipping 3175 matching lines @@
   RegisterEnvironmentForDeoptimization(environment, Safepoint::kNoLazyDeopt);
   ASSERT(osr_pc_offset_ == -1);
   osr_pc_offset_ = masm()->pc_offset();
 }
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64