Add HArrayBufferNotNeutered instruction

src/x64/lithium-codegen-x64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/base/bits.h"
 #include "src/code-factory.h"
@@ skipping 5143 matching lines @@
 
 void LCodeGen::DoCheckNonSmi(LCheckNonSmi* instr) {
   if (!instr->hydrogen()->value()->type().IsHeapObject()) {
     LOperand* input = instr->value();
     Condition cc = masm()->CheckSmi(ToRegister(input));
     DeoptimizeIf(cc, instr, Deoptimizer::kSmi);
   }
 }
 
 
+void LCodeGen::DoCheckArrayBufferNotNeutered(
+    LCheckArrayBufferNotNeutered* instr) {
+  Register view = ToRegister(instr->view());
+
+  Label has_no_buffer;
+  __ movp(kScratchRegister,
+          FieldOperand(view, JSArrayBufferView::kBufferOffset));
+  __ JumpIfSmi(kScratchRegister, &has_no_buffer);
+  __ testb(FieldOperand(kScratchRegister, JSArrayBuffer::kBitFieldOffset),
+           Immediate(1 << JSArrayBuffer::WasNeutered::kShift));
+  DeoptimizeIf(not_zero, instr, Deoptimizer::kOutOfBounds);

[Sven Panne, 2015/04/28 13:45:16]

Would it be worth introducing a new deopt message instead of kOutOfBounds? As it
is, things might be confusing for users...

+
+  __ bind(&has_no_buffer);
+}
+
+
 void LCodeGen::DoCheckInstanceType(LCheckInstanceType* instr) {
   Register input = ToRegister(instr->value());
 
   __ movp(kScratchRegister, FieldOperand(input, HeapObject::kMapOffset));
 
   if (instr->hydrogen()->is_interval_check()) {
     InstanceType first;
     InstanceType last;
     instr->hydrogen()->GetCheckInterval(&first, &last);
 
@@ skipping 759 matching lines @@
   CallRuntime(Runtime::kPushBlockContext, 2, instr);
   RecordSafepoint(Safepoint::kNoLazyDeopt);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64