[arm64] serialize internal references via object visitor

src/arm64/assembler-arm64-inl.h

 // 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.
 
 #ifndef V8_ARM64_ASSEMBLER_ARM64_INL_H_
 #define V8_ARM64_ASSEMBLER_ARM64_INL_H_
 
 #include "src/arm64/assembler-arm64.h"
 #include "src/assembler.h"
 #include "src/debug.h"
@@ skipping 643 matching lines @@
 
 
 void Assembler::deserialization_set_special_target_at(
     Address constant_pool_entry, Code* code, Address target) {
   Memory::Address_at(constant_pool_entry) = target;
 }
 
 
 void Assembler::deserialization_set_target_internal_reference_at(
     Address pc, Address target) {
-  UNIMPLEMENTED();  // ARM64 does not use internal references.
+  Memory::Address_at(pc) = target;
 }
 
 
 void Assembler::set_target_address_at(Address pc,
                                       ConstantPoolArray* constant_pool,
                                       Address target,
                                       ICacheFlushMode icache_flush_mode) {
   Memory::Address_at(target_pointer_address_at(pc)) = target;
   // Intuitively, we would think it is necessary to always flush the
   // instruction cache after patching a target address in the code as follows:
@@ skipping 70 matching lines @@
 
 
 Address RelocInfo::target_external_reference() {
   DCHECK(rmode_ == EXTERNAL_REFERENCE);
   return Assembler::target_address_at(pc_, host_);
 }
 
 
 Address RelocInfo::target_internal_reference() {
   DCHECK(rmode_ == INTERNAL_REFERENCE);
-  UNIMPLEMENTED();  // ARM64 does not use internal references.
-  return NULL;
+  return Memory::Address_at(pc_);
 }
 
 
 Address RelocInfo::target_internal_reference_address() {
   DCHECK(rmode_ == INTERNAL_REFERENCE);
-  UNIMPLEMENTED();  // ARM64 does not use internal references.
-  return NULL;
+  return reinterpret_cast<Address>(pc_);
 }
 
 
 Address RelocInfo::target_runtime_entry(Assembler* origin) {
   DCHECK(IsRuntimeEntry(rmode_));
   return target_address();
 }
 
 
 void RelocInfo::set_target_runtime_entry(Address target,
@@ skipping 74 matching lines @@
         host(), this, HeapObject::cast(target_code));
   }
 }
 
 
 void RelocInfo::WipeOut() {
   DCHECK(IsEmbeddedObject(rmode_) || IsCodeTarget(rmode_) ||
          IsRuntimeEntry(rmode_) || IsExternalReference(rmode_) ||
          IsInternalReference(rmode_));
   if (IsInternalReference(rmode_)) {
-    UNIMPLEMENTED();  // ARM64 does not use internal references.
+    Memory::Address_at(pc_) = NULL;
   } else {
     Assembler::set_target_address_at(pc_, host_, NULL);
   }
 }
 
 
 bool RelocInfo::IsPatchedReturnSequence() {
   // The sequence must be:
   //   ldr ip0, [pc, #offset]
   //   blr ip0
@@ skipping 15 matching lines @@
   RelocInfo::Mode mode = rmode();
   if (mode == RelocInfo::EMBEDDED_OBJECT) {
     visitor->VisitEmbeddedPointer(this);
   } else if (RelocInfo::IsCodeTarget(mode)) {
     visitor->VisitCodeTarget(this);
   } else if (mode == RelocInfo::CELL) {
     visitor->VisitCell(this);
   } else if (mode == RelocInfo::EXTERNAL_REFERENCE) {
     visitor->VisitExternalReference(this);
   } else if (mode == RelocInfo::INTERNAL_REFERENCE) {
-    UNIMPLEMENTED();  // ARM64 does not use internal references.
+    visitor->VisitInternalReference(this);
   } else if (((RelocInfo::IsJSReturn(mode) &&
               IsPatchedReturnSequence()) ||
              (RelocInfo::IsDebugBreakSlot(mode) &&
               IsPatchedDebugBreakSlotSequence())) &&
              isolate->debug()->has_break_points()) {
     visitor->VisitDebugTarget(this);
   } else if (RelocInfo::IsRuntimeEntry(mode)) {
     visitor->VisitRuntimeEntry(this);
   }
 }
 
 
 template<typename StaticVisitor>
 void RelocInfo::Visit(Heap* heap) {
   RelocInfo::Mode mode = rmode();
   if (mode == RelocInfo::EMBEDDED_OBJECT) {
     StaticVisitor::VisitEmbeddedPointer(heap, this);
   } else if (RelocInfo::IsCodeTarget(mode)) {
     StaticVisitor::VisitCodeTarget(heap, this);
   } else if (mode == RelocInfo::CELL) {
     StaticVisitor::VisitCell(heap, this);
   } else if (mode == RelocInfo::EXTERNAL_REFERENCE) {
     StaticVisitor::VisitExternalReference(this);
   } else if (mode == RelocInfo::INTERNAL_REFERENCE) {
-    UNIMPLEMENTED();  // ARM64 does not use internal references.
+    StaticVisitor::VisitInternalReference(this);
   } else if (heap->isolate()->debug()->has_break_points() &&
              ((RelocInfo::IsJSReturn(mode) &&
               IsPatchedReturnSequence()) ||
              (RelocInfo::IsDebugBreakSlot(mode) &&
               IsPatchedDebugBreakSlotSequence()))) {
     StaticVisitor::VisitDebugTarget(heap, this);
   } else if (RelocInfo::IsRuntimeEntry(mode)) {
     StaticVisitor::VisitRuntimeEntry(this);
   }
 }
@@ skipping 365 matching lines @@
 
 
 void Assembler::ClearRecordedAstId() {
   recorded_ast_id_ = TypeFeedbackId::None();
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARM64_ASSEMBLER_ARM64_INL_H_