diff --git a/compiler/optimizing/code_generator_arm64.h b/compiler/optimizing/code_generator_arm64.h
index 96013e5..100dafe 100644
--- a/compiler/optimizing/code_generator_arm64.h
+++ b/compiler/optimizing/code_generator_arm64.h
@@ -31,7 +31,10 @@
 namespace arm64 {
 
 class CodeGeneratorARM64;
-class SlowPathCodeARM64;
+
+// TODO: Tune the use of Load-Acquire, Store-Release vs Data Memory Barriers.
+// For now we prefer the use of load-acquire, store-release over explicit memory barriers.
+static constexpr bool kUseAcquireRelease = true;
 
 // Use a local definition to prevent copying mistakes.
 static constexpr size_t kArm64WordSize = kArm64PointerSize;
@@ -45,7 +48,8 @@
 };
 static constexpr size_t kParameterFPRegistersLength = arraysize(kParameterFPRegisters);
 
-const vixl::Register tr = vixl::x18;        // Thread Register
+const vixl::Register tr = vixl::x18;                        // Thread Register
+static const vixl::Register kArtMethodRegister = vixl::w0;  // Method register on invoke.
 
 const vixl::CPURegList vixl_reserved_core_registers(vixl::ip0, vixl::ip1);
 const vixl::CPURegList vixl_reserved_fp_registers(vixl::d31);
@@ -56,6 +60,20 @@
 
 Location ARM64ReturnLocation(Primitive::Type return_type);
 
+class SlowPathCodeARM64 : public SlowPathCode {
+ public:
+  SlowPathCodeARM64() : entry_label_(), exit_label_() {}
+
+  vixl::Label* GetEntryLabel() { return &entry_label_; }
+  vixl::Label* GetExitLabel() { return &exit_label_; }
+
+ private:
+  vixl::Label entry_label_;
+  vixl::Label exit_label_;
+
+  DISALLOW_COPY_AND_ASSIGN(SlowPathCodeARM64);
+};
+
 class InvokeDexCallingConvention : public CallingConvention<vixl::Register, vixl::FPRegister> {
  public:
   InvokeDexCallingConvention()
@@ -274,6 +292,8 @@
     return false;
   }
 
+  void GenerateStaticOrDirectCall(HInvokeStaticOrDirect* invoke, vixl::Register temp);
+
  private:
   // Labels for each block that will be compiled.
   vixl::Label* block_labels_;