diff --git a/compiler/Android.mk b/compiler/Android.mk
index c6662c2..27bc3a3 100644
--- a/compiler/Android.mk
+++ b/compiler/Android.mk
@@ -90,6 +90,7 @@
 	utils/x86/assembler_x86.cc \
 	utils/x86/managed_register_x86.cc \
 	buffered_output_stream.cc \
+	compiler_backend.cc \
 	elf_fixup.cc \
 	elf_stripper.cc \
 	elf_writer.cc \
diff --git a/compiler/compiler_backend.cc b/compiler/compiler_backend.cc
new file mode 100644
index 0000000..b8f21a9
--- /dev/null
+++ b/compiler/compiler_backend.cc
@@ -0,0 +1,293 @@
+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "compiler_backend.h"
+#include "elf_writer_quick.h"
+#include "dex/quick/mir_to_lir.h"
+#include "dex/mir_graph.h"
+#include "driver/compiler_driver.h"
+#include "mirror/art_method-inl.h"
+
+#ifdef ART_USE_PORTABLE_COMPILER
+#include "dex/portable/mir_to_gbc.h"
+#include "elf_writer_mclinker.h"
+#endif
+
+namespace art {
+
+#ifdef ART_SEA_IR_MODE
+extern "C" art::CompiledMethod* SeaIrCompileMethod(art::CompilerDriver& compiler,
+                                                   const art::DexFile::CodeItem* code_item,
+                                                   uint32_t access_flags,
+                                                   art::InvokeType invoke_type,
+                                                   uint16_t class_def_idx,
+                                                   uint32_t method_idx,
+                                                   jobject class_loader,
+                                                   const art::DexFile& dex_file);
+#endif
+
+extern "C" void ArtInitQuickCompilerContext(art::CompilerDriver& driver);
+extern "C" void ArtUnInitQuickCompilerContext(art::CompilerDriver& driver);
+extern "C" art::CompiledMethod* ArtQuickCompileMethod(art::CompilerDriver& compiler,
+                                                      const art::DexFile::CodeItem* code_item,
+                                                      uint32_t access_flags,
+                                                      art::InvokeType invoke_type,
+                                                      uint16_t class_def_idx,
+                                                      uint32_t method_idx,
+                                                      jobject class_loader,
+                                                      const art::DexFile& dex_file);
+
+extern "C" art::CompiledMethod* ArtQuickJniCompileMethod(art::CompilerDriver& compiler,
+                                                         uint32_t access_flags, uint32_t method_idx,
+                                                         const art::DexFile& dex_file);
+
+
+static CompiledMethod* TryCompileWithSeaIR(art::CompilerDriver& compiler,
+                                           const art::DexFile::CodeItem* code_item,
+                                           uint32_t access_flags,
+                                           art::InvokeType invoke_type,
+                                           uint16_t class_def_idx,
+                                           uint32_t method_idx,
+                                           jobject class_loader,
+                                           const art::DexFile& dex_file) {
+#ifdef ART_SEA_IR_MODE
+    bool use_sea = Runtime::Current()->IsSeaIRMode();
+    use_sea = use_sea &&
+        (std::string::npos != PrettyMethod(method_idx, dex_file).find("fibonacci"));
+    if (use_sea) {
+      LOG(INFO) << "Using SEA IR to compile..." << std::endl;
+      return SeaIrCompileMethod(compiler,
+                                code_item,
+                                access_flags,
+                                invoke_type,
+                                class_def_idx,
+                                method_idx,
+                                class_loader,
+                                dex_file);
+  }
+#endif
+  return nullptr;
+}
+
+
+class QuickBackend : public CompilerBackend {
+ public:
+  QuickBackend() : CompilerBackend(100) {}
+
+  void Init(CompilerDriver& driver) const {
+    ArtInitQuickCompilerContext(driver);
+  }
+
+  void UnInit(CompilerDriver& driver) const {
+    ArtUnInitQuickCompilerContext(driver);
+  }
+
+  CompiledMethod* Compile(CompilerDriver& compiler,
+                          const DexFile::CodeItem* code_item,
+                          uint32_t access_flags,
+                          InvokeType invoke_type,
+                          uint16_t class_def_idx,
+                          uint32_t method_idx,
+                          jobject class_loader,
+                          const DexFile& dex_file) const {
+    CompiledMethod* method = TryCompileWithSeaIR(compiler,
+                                                 code_item,
+                                                 access_flags,
+                                                 invoke_type,
+                                                 class_def_idx,
+                                                 method_idx,
+                                                 class_loader,
+                                                 dex_file);
+    if (method != nullptr) return method;
+
+    return ArtQuickCompileMethod(compiler,
+                                 code_item,
+                                 access_flags,
+                                 invoke_type,
+                                 class_def_idx,
+                                 method_idx,
+                                 class_loader,
+                                 dex_file);
+  }
+
+  CompiledMethod* JniCompile(CompilerDriver& driver,
+                             uint32_t access_flags,
+                             uint32_t method_idx,
+                             const DexFile& dex_file) const {
+    return ArtQuickJniCompileMethod(driver, access_flags, method_idx, dex_file);
+  }
+
+  uintptr_t GetEntryPointOf(mirror::ArtMethod* method) const {
+    return reinterpret_cast<uintptr_t>(method->GetEntryPointFromQuickCompiledCode());
+  }
+
+  bool WriteElf(art::File* file,
+                OatWriter& oat_writer,
+                const std::vector<const art::DexFile*>& dex_files,
+                const std::string& android_root,
+                bool is_host, const CompilerDriver& driver) const
+    SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
+    return art::ElfWriterQuick::Create(file, oat_writer, dex_files, android_root, is_host, driver);
+  }
+
+  Backend* GetCodeGenerator(CompilationUnit* cu, void* compilation_unit) const {
+    Mir2Lir* mir_to_lir = nullptr;
+    switch (cu->instruction_set) {
+      case kThumb2:
+        mir_to_lir = ArmCodeGenerator(cu, cu->mir_graph.get(), &cu->arena);
+        break;
+      case kMips:
+        mir_to_lir = MipsCodeGenerator(cu, cu->mir_graph.get(), &cu->arena);
+        break;
+      case kX86:
+        mir_to_lir = X86CodeGenerator(cu, cu->mir_graph.get(), &cu->arena);
+        break;
+      default:
+        LOG(FATAL) << "Unexpected instruction set: " << cu->instruction_set;
+    }
+
+    /* The number of compiler temporaries depends on backend so set it up now if possible */
+    if (mir_to_lir) {
+      size_t max_temps = mir_to_lir->GetMaxPossibleCompilerTemps();
+      bool set_max = cu->mir_graph->SetMaxAvailableNonSpecialCompilerTemps(max_temps);
+      CHECK(set_max);
+    }
+    return mir_to_lir;;
+  }
+
+  void InitCompilationUnit(CompilationUnit& cu) const {}
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(QuickBackend);
+};
+
+#ifdef ART_USE_PORTABLE_COMPILER
+
+extern "C" void ArtInitCompilerContext(art::CompilerDriver& driver);
+extern "C" void ArtUnInitCompilerContext(art::CompilerDriver& driver);
+extern "C" art::CompiledMethod* ArtCompileMethod(art::CompilerDriver& driver,
+                                                 const art::DexFile::CodeItem* code_item,
+                                                 uint32_t access_flags,
+                                                 art::InvokeType invoke_type,
+                                                 uint16_t class_def_idx,
+                                                 uint32_t method_idx,
+                                                 jobject class_loader,
+                                                 const art::DexFile& dex_file);
+extern "C" art::CompiledMethod* ArtLLVMJniCompileMethod(art::CompilerDriver& driver,
+                                                        uint32_t access_flags, uint32_t method_idx,
+                                                        const art::DexFile& dex_file);
+
+
+class LLVMBackend : public CompilerBackend {
+ public:
+  LLVMBackend() : CompilerBackend(1000) {}
+
+  void Init(CompilerDriver& driver) const {
+    ArtInitCompilerContext(driver);
+  }
+
+  void UnInit(CompilerDriver& driver) const {
+    ArtUnInitCompilerContext(driver);
+  }
+
+  CompiledMethod* Compile(CompilerDriver& compiler,
+                          const DexFile::CodeItem* code_item,
+                          uint32_t access_flags,
+                          InvokeType invoke_type,
+                          uint16_t class_def_idx,
+                          uint32_t method_idx,
+                          jobject class_loader,
+                          const DexFile& dex_file) const {
+    CompiledMethod* method = TryCompileWithSeaIR(compiler,
+                                                 code_item,
+                                                 access_flags,
+                                                 invoke_type,
+                                                 class_def_idx,
+                                                 method_idx,
+                                                 class_loader,
+                                                 dex_file);
+    if (method != nullptr) return method;
+
+    return ArtCompileMethod(compiler,
+                            code_item,
+                            access_flags,
+                            invoke_type,
+                            class_def_idx,
+                            method_idx,
+                            class_loader,
+                            dex_file);
+  }
+
+  CompiledMethod* JniCompile(CompilerDriver& driver,
+                             uint32_t access_flags,
+                             uint32_t method_idx,
+                             const DexFile& dex_file) const {
+    return ArtLLVMJniCompileMethod(driver, access_flags, method_idx, dex_file);
+  }
+
+  uintptr_t GetEntryPointOf(mirror::ArtMethod* method) const {
+    return reinterpret_cast<uintptr_t>(method->GetEntryPointFromPortableCompiledCode());
+  }
+
+  bool WriteElf(art::File* file,
+                OatWriter& oat_writer,
+                const std::vector<const art::DexFile*>& dex_files,
+                const std::string& android_root,
+                bool is_host, const CompilerDriver& driver) const
+    SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
+    return art::ElfWriterMclinker::Create(
+        file, oat_writer, dex_files, android_root, is_host, driver);
+  }
+
+  Backend* GetCodeGenerator(CompilationUnit* cu, void* compilation_unit) const {
+    return PortableCodeGenerator(
+        cu, cu->mir_graph.get(), &cu->arena,
+        reinterpret_cast<art::llvm::LlvmCompilationUnit*>(compilation_unit));
+  }
+
+  void InitCompilationUnit(CompilationUnit& cu) const {
+      // Fused long branches not currently useful in bitcode.
+    cu.disable_opt |=
+        (1 << kBranchFusing) |
+        (1 << kSuppressExceptionEdges);
+  }
+
+  bool isPortable() const { return true; }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(LLVMBackend);
+};
+#endif
+
+CompilerBackend* CompilerBackend::Create(CompilerBackend::Kind kind) {
+  switch (kind) {
+    case kQuick:
+      return new QuickBackend();
+      break;
+    case kPortable:
+#ifdef ART_USE_PORTABLE_COMPILER
+      return new LLVMBackend();
+#else
+      LOG(FATAL) << "Portable compiler not compiled";
+#endif
+      break;
+    default:
+      LOG(FATAL) << "UNREACHABLE";
+  }
+  return nullptr;
+}
+
+}  // namespace art
diff --git a/compiler/compiler_backend.h b/compiler/compiler_backend.h
new file mode 100644
index 0000000..5ebeef1
--- /dev/null
+++ b/compiler/compiler_backend.h
@@ -0,0 +1,96 @@
+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ART_COMPILER_COMPILER_BACKEND_H_
+#define ART_COMPILER_COMPILER_BACKEND_H_
+
+#include "dex_file.h"
+#include "os.h"
+
+namespace art {
+
+class Backend;
+class CompilationUnit;
+class CompilerDriver;
+class CompiledMethod;
+class MIRGraph;
+class OatWriter;
+
+namespace mirror {
+  class ArtMethod;
+}
+
+class CompilerBackend {
+ public:
+  enum Kind {
+    kQuick,
+    kPortable
+  };
+
+  CompilerBackend(int warning)
+      : maximum_compilation_time_before_warning_(warning) {}
+
+  static CompilerBackend* Create(Kind kind);
+
+  virtual void Init(CompilerDriver& driver) const = 0;
+
+  virtual void UnInit(CompilerDriver& driver) const = 0;
+
+  virtual CompiledMethod* Compile(CompilerDriver& compiler,
+                                  const DexFile::CodeItem* code_item,
+                                  uint32_t access_flags,
+                                  InvokeType invoke_type,
+                                  uint16_t class_def_idx,
+                                  uint32_t method_idx,
+                                  jobject class_loader,
+                                  const DexFile& dex_file) const = 0;
+
+  virtual CompiledMethod* JniCompile(CompilerDriver& driver,
+                                     uint32_t access_flags,
+                                     uint32_t method_idx,
+                                     const DexFile& dex_file) const = 0;
+
+  virtual uintptr_t GetEntryPointOf(mirror::ArtMethod* method) const = 0;
+
+  virtual bool WriteElf(art::File* file,
+                        OatWriter& oat_writer,
+                        const std::vector<const art::DexFile*>& dex_files,
+                        const std::string& android_root,
+                        bool is_host, const CompilerDriver& driver) const
+    SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) = 0;
+
+  virtual Backend* GetCodeGenerator(CompilationUnit* cu,
+                                    void* compilation_unit) const = 0;
+
+  uint64_t GetMaximumCompilationTimeBeforeWarning() const {
+    return maximum_compilation_time_before_warning_;
+  }
+
+  virtual bool IsPortable() const { return false; }
+
+  virtual void InitCompilationUnit(CompilationUnit& cu) const = 0;
+
+  virtual ~CompilerBackend() {}
+
+ private:
+  uint64_t maximum_compilation_time_before_warning_;
+
+  DISALLOW_COPY_AND_ASSIGN(CompilerBackend);
+};
+
+}  // namespace art
+
+#endif  // ART_COMPILER_DRIVER_COMPILER_BACKEND_H_
diff --git a/compiler/dex/compiler_ir.h b/compiler/dex/compiler_ir.h
index 32fd79b..ea8eb1c 100644
--- a/compiler/dex/compiler_ir.h
+++ b/compiler/dex/compiler_ir.h
@@ -68,7 +68,7 @@
   uint32_t disable_opt;                // opt_control_vector flags.
   uint32_t enable_debug;               // debugControlVector flags.
   bool verbose;
-  CompilerBackend compiler_backend;
+  const CompilerBackend* compiler_backend;
   InstructionSet instruction_set;
 
   const InstructionSetFeatures& GetInstructionSetFeatures() {
diff --git a/compiler/dex/frontend.cc b/compiler/dex/frontend.cc
index 8f83cd0..591d92a 100644
--- a/compiler/dex/frontend.cc
+++ b/compiler/dex/frontend.cc
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#include <llvm/Support/Threading.h>
-
+#include "compiler_backend.h"
 #include "compiler_internals.h"
 #include "driver/compiler_driver.h"
 #include "dataflow_iterator-inl.h"
@@ -27,42 +26,9 @@
 #include "base/logging.h"
 #include "base/timing_logger.h"
 
-#if defined(ART_USE_PORTABLE_COMPILER)
-#include "dex/portable/mir_to_gbc.h"
-#include "llvm/llvm_compilation_unit.h"
-#endif
-
 #include "dex/quick/dex_file_to_method_inliner_map.h"
 
-namespace {
-#if !defined(ART_USE_PORTABLE_COMPILER)
-  pthread_once_t llvm_multi_init = PTHREAD_ONCE_INIT;
-#endif
-  void InitializeLLVMForQuick() {
-    ::llvm::llvm_start_multithreaded();
-  }
-}
-
 namespace art {
-namespace llvm {
-::llvm::Module* makeLLVMModuleContents(::llvm::Module* module);
-}
-
-LLVMInfo::LLVMInfo() {
-#if !defined(ART_USE_PORTABLE_COMPILER)
-  pthread_once(&llvm_multi_init, InitializeLLVMForQuick);
-#endif
-  // Create context, module, intrinsic helper & ir builder
-  llvm_context_.reset(new ::llvm::LLVMContext());
-  llvm_module_ = new ::llvm::Module("art", *llvm_context_);
-  ::llvm::StructType::create(*llvm_context_, "JavaObject");
-  art::llvm::makeLLVMModuleContents(llvm_module_);
-  intrinsic_helper_.reset(new art::llvm::IntrinsicHelper(*llvm_context_, *llvm_module_));
-  ir_builder_.reset(new art::llvm::IRBuilder(*llvm_context_, *llvm_module_, *intrinsic_helper_));
-}
-
-LLVMInfo::~LLVMInfo() {
-}
 
 extern "C" void ArtInitQuickCompilerContext(art::CompilerDriver& driver) {
   CHECK(driver.GetCompilerContext() == NULL);
@@ -123,7 +89,7 @@
     disable_opt(0),
     enable_debug(0),
     verbose(false),
-    compiler_backend(kNoBackend),
+    compiler_backend(NULL),
     instruction_set(kNone),
     num_dalvik_registers(0),
     insns(NULL),
@@ -163,15 +129,12 @@
 }
 
 static CompiledMethod* CompileMethod(CompilerDriver& compiler,
-                                     const CompilerBackend compiler_backend,
+                                     CompilerBackend* compiler_backend,
                                      const DexFile::CodeItem* code_item,
                                      uint32_t access_flags, InvokeType invoke_type,
                                      uint16_t class_def_idx, uint32_t method_idx,
-                                     jobject class_loader, const DexFile& dex_file
-#if defined(ART_USE_PORTABLE_COMPILER)
-                                     , llvm::LlvmCompilationUnit* llvm_compilation_unit
-#endif
-) {
+                                     jobject class_loader, const DexFile& dex_file,
+                                     void* llvm_compilation_unit) {
   VLOG(compiler) << "Compiling " << PrettyMethod(method_idx, dex_file) << "...";
   if (code_item->insns_size_in_code_units_ >= 0x10000) {
     LOG(INFO) << "Method size exceeds compiler limits: " << code_item->insns_size_in_code_units_
@@ -211,12 +174,7 @@
    * MIR and backend flags?  Need command-line setting as well.
    */
 
-  if (compiler_backend == kPortable) {
-    // Fused long branches not currently useful in bitcode.
-    cu.disable_opt |=
-        (1 << kBranchFusing) |
-        (1 << kSuppressExceptionEdges);
-  }
+  compiler_backend->InitCompilationUnit(cu);
 
   if (cu.instruction_set == kMips) {
     // Disable some optimizations for mips for now
@@ -241,37 +199,7 @@
    * The reason we do this is that optimizations on the MIR graph may need to get information
    * that is only available if a CG exists.
    */
-#if defined(ART_USE_PORTABLE_COMPILER)
-  if (compiler_backend == kPortable) {
-    cu.cg.reset(PortableCodeGenerator(&cu, cu.mir_graph.get(), &cu.arena, llvm_compilation_unit));
-  } else {
-#endif
-    Mir2Lir* mir_to_lir = nullptr;
-    switch (compiler.GetInstructionSet()) {
-      case kThumb2:
-        mir_to_lir = ArmCodeGenerator(&cu, cu.mir_graph.get(), &cu.arena);
-        break;
-      case kMips:
-        mir_to_lir = MipsCodeGenerator(&cu, cu.mir_graph.get(), &cu.arena);
-        break;
-      case kX86:
-        mir_to_lir = X86CodeGenerator(&cu, cu.mir_graph.get(), &cu.arena);
-        break;
-      default:
-        LOG(FATAL) << "Unexpected instruction set: " << compiler.GetInstructionSet();
-    }
-
-    cu.cg.reset(mir_to_lir);
-
-    /* The number of compiler temporaries depends on backend so set it up now if possible */
-    if (mir_to_lir) {
-      size_t max_temps = mir_to_lir->GetMaxPossibleCompilerTemps();
-      bool set_max = cu.mir_graph->SetMaxAvailableNonSpecialCompilerTemps(max_temps);
-      CHECK(set_max);
-    }
-#if defined(ART_USE_PORTABLE_COMPILER)
-  }
-#endif
+  cu.cg.reset(compiler_backend->GetCodeGenerator(&cu, llvm_compilation_unit));
 
   /* Gathering opcode stats? */
   if (kCompilerDebugFlags & (1 << kDebugCountOpcodes)) {
@@ -283,11 +211,9 @@
                               class_loader, dex_file);
 
   cu.NewTimingSplit("MIROpt:CheckFilters");
-#if !defined(ART_USE_PORTABLE_COMPILER)
   if (cu.mir_graph->SkipCompilation(Runtime::Current()->GetCompilerFilter())) {
     return NULL;
   }
-#endif
 
   /* Create the pass driver and launch it */
   PassDriver driver(&cu);
@@ -338,7 +264,7 @@
 }
 
 CompiledMethod* CompileOneMethod(CompilerDriver& compiler,
-                                 const CompilerBackend backend,
+                                 CompilerBackend* backend,
                                  const DexFile::CodeItem* code_item,
                                  uint32_t access_flags,
                                  InvokeType invoke_type,
@@ -346,13 +272,9 @@
                                  uint32_t method_idx,
                                  jobject class_loader,
                                  const DexFile& dex_file,
-                                 llvm::LlvmCompilationUnit* llvm_compilation_unit) {
+                                 void* compilation_unit) {
   return CompileMethod(compiler, backend, code_item, access_flags, invoke_type, class_def_idx,
-                       method_idx, class_loader, dex_file
-#if defined(ART_USE_PORTABLE_COMPILER)
-                       , llvm_compilation_unit
-#endif
-                       );  // NOLINT(whitespace/parens)
+                       method_idx, class_loader, dex_file, compilation_unit);
 }
 
 }  // namespace art
@@ -364,7 +286,7 @@
                           uint16_t class_def_idx, uint32_t method_idx, jobject class_loader,
                           const art::DexFile& dex_file) {
   // TODO: check method fingerprint here to determine appropriate backend type.  Until then, use build default
-  art::CompilerBackend backend = compiler.GetCompilerBackend();
+  art::CompilerBackend* backend = compiler.GetCompilerBackend();
   return art::CompileOneMethod(compiler, backend, code_item, access_flags, invoke_type,
                                class_def_idx, method_idx, class_loader, dex_file,
                                NULL /* use thread llvm_info */);
diff --git a/compiler/dex/mir_optimization.cc b/compiler/dex/mir_optimization.cc
index 209ed3d..b91ef28 100644
--- a/compiler/dex/mir_optimization.cc
+++ b/compiler/dex/mir_optimization.cc
@@ -406,7 +406,7 @@
       // Is this the select pattern?
       // TODO: flesh out support for Mips.  NOTE: llvm's select op doesn't quite work here.
       // TUNING: expand to support IF_xx compare & branches
-      if ((cu_->compiler_backend != kPortable) &&
+      if (cu_->compiler_backend->IsPortable() &&
           (cu_->instruction_set == kThumb2 || cu_->instruction_set == kX86) &&
           ((mir->dalvikInsn.opcode == Instruction::IF_EQZ) ||
           (mir->dalvikInsn.opcode == Instruction::IF_NEZ))) {
diff --git a/compiler/dex/portable/mir_to_gbc.cc b/compiler/dex/portable/mir_to_gbc.cc
index e6cc2de..3187fbb 100644
--- a/compiler/dex/portable/mir_to_gbc.cc
+++ b/compiler/dex/portable/mir_to_gbc.cc
@@ -41,6 +41,22 @@
 const char kCatchBlock = 'C';
 
 namespace art {
+namespace llvm {
+::llvm::Module* makeLLVMModuleContents(::llvm::Module* module);
+}
+
+LLVMInfo::LLVMInfo() {
+  // Create context, module, intrinsic helper & ir builder
+  llvm_context_.reset(new ::llvm::LLVMContext());
+  llvm_module_ = new ::llvm::Module("art", *llvm_context_);
+  ::llvm::StructType::create(*llvm_context_, "JavaObject");
+  art::llvm::makeLLVMModuleContents(llvm_module_);
+  intrinsic_helper_.reset(new art::llvm::IntrinsicHelper(*llvm_context_, *llvm_module_));
+  ir_builder_.reset(new art::llvm::IRBuilder(*llvm_context_, *llvm_module_, *intrinsic_helper_));
+}
+
+LLVMInfo::~LLVMInfo() {
+}
 
 ::llvm::BasicBlock* MirConverter::GetLLVMBlock(int id) {
   return id_to_block_map_.Get(id);
diff --git a/compiler/driver/compiler_driver.cc b/compiler/driver/compiler_driver.cc
index 5b22817..8bf2f42 100644
--- a/compiler/driver/compiler_driver.cc
+++ b/compiler/driver/compiler_driver.cc
@@ -25,6 +25,7 @@
 #include "base/stl_util.h"
 #include "base/timing_logger.h"
 #include "class_linker.h"
+#include "compiler_backend.h"
 #include "dex_compilation_unit.h"
 #include "dex_file-inl.h"
 #include "dex/verification_results.h"
@@ -52,12 +53,6 @@
 #include "verifier/method_verifier.h"
 #include "verifier/method_verifier-inl.h"
 
-#if defined(ART_USE_PORTABLE_COMPILER)
-#include "elf_writer_mclinker.h"
-#else
-#include "elf_writer_quick.h"
-#endif
-
 namespace art {
 
 static double Percentage(size_t x, size_t y) {
@@ -287,28 +282,6 @@
   DISALLOW_COPY_AND_ASSIGN(AOTCompilationStats);
 };
 
-extern "C" void ArtInitCompilerContext(art::CompilerDriver& driver);
-extern "C" void ArtInitQuickCompilerContext(art::CompilerDriver& driver);
-
-extern "C" void ArtUnInitCompilerContext(art::CompilerDriver& driver);
-extern "C" void ArtUnInitQuickCompilerContext(art::CompilerDriver& driver);
-
-extern "C" art::CompiledMethod* ArtCompileMethod(art::CompilerDriver& driver,
-                                                 const art::DexFile::CodeItem* code_item,
-                                                 uint32_t access_flags,
-                                                 art::InvokeType invoke_type,
-                                                 uint16_t class_def_idx,
-                                                 uint32_t method_idx,
-                                                 jobject class_loader,
-                                                 const art::DexFile& dex_file);
-extern "C" art::CompiledMethod* ArtQuickCompileMethod(art::CompilerDriver& compiler,
-                                                      const art::DexFile::CodeItem* code_item,
-                                                      uint32_t access_flags,
-                                                      art::InvokeType invoke_type,
-                                                      uint16_t class_def_idx,
-                                                      uint32_t method_idx,
-                                                      jobject class_loader,
-                                                      const art::DexFile& dex_file);
 
 extern "C" art::CompiledMethod* ArtCompileDEX(art::CompilerDriver& compiler,
                                               const art::DexFile::CodeItem* code_item,
@@ -318,36 +291,20 @@
                                               uint32_t method_idx,
                                               jobject class_loader,
                                               const art::DexFile& dex_file);
-#ifdef ART_SEA_IR_MODE
-extern "C" art::CompiledMethod* SeaIrCompileMethod(art::CompilerDriver& compiler,
-                                                   const art::DexFile::CodeItem* code_item,
-                                                   uint32_t access_flags,
-                                                   art::InvokeType invoke_type,
-                                                   uint16_t class_def_idx,
-                                                   uint32_t method_idx,
-                                                   jobject class_loader,
-                                                   const art::DexFile& dex_file);
-#endif
-extern "C" art::CompiledMethod* ArtLLVMJniCompileMethod(art::CompilerDriver& driver,
-                                                        uint32_t access_flags, uint32_t method_idx,
-                                                        const art::DexFile& dex_file);
-
-extern "C" art::CompiledMethod* ArtQuickJniCompileMethod(art::CompilerDriver& compiler,
-                                                         uint32_t access_flags, uint32_t method_idx,
-                                                         const art::DexFile& dex_file);
 
 extern "C" void compilerLLVMSetBitcodeFileName(art::CompilerDriver& driver,
                                                std::string const& filename);
 
 CompilerDriver::CompilerDriver(VerificationResults* verification_results,
                                DexFileToMethodInlinerMap* method_inliner_map,
-                               CompilerBackend compiler_backend, InstructionSet instruction_set,
+                               CompilerBackend::Kind compiler_backend_kind,
+                               InstructionSet instruction_set,
                                InstructionSetFeatures instruction_set_features,
                                bool image, DescriptorSet* image_classes, size_t thread_count,
                                bool dump_stats, bool dump_passes, CumulativeLogger* timer)
     : verification_results_(verification_results),
       method_inliner_map_(method_inliner_map),
-      compiler_backend_(compiler_backend),
+      compiler_backend_(CompilerBackend::Create(compiler_backend_kind)),
       instruction_set_(instruction_set),
       instruction_set_features_(instruction_set_features),
       freezing_constructor_lock_("freezing constructor lock"),
@@ -362,9 +319,7 @@
       dump_passes_(dump_passes),
       timings_logger_(timer),
       compiler_library_(NULL),
-      compiler_(NULL),
       compiler_context_(NULL),
-      jni_compiler_(NULL),
       compiler_enable_auto_elf_loading_(NULL),
       compiler_get_method_code_addr_(NULL),
       support_boot_image_fixup_(instruction_set != kMips),
@@ -375,34 +330,9 @@
 
   CHECK_PTHREAD_CALL(pthread_key_create, (&tls_key_, NULL), "compiler tls key");
 
-  // TODO: more work needed to combine initializations and allow per-method backend selection
-  typedef void (*InitCompilerContextFn)(CompilerDriver&);
-  InitCompilerContextFn init_compiler_context;
-  if (compiler_backend_ == kPortable) {
-    // Initialize compiler_context_
-    init_compiler_context = reinterpret_cast<void (*)(CompilerDriver&)>(ArtInitCompilerContext);
-    compiler_ = reinterpret_cast<CompilerFn>(ArtCompileMethod);
-  } else {
-    init_compiler_context = reinterpret_cast<void (*)(CompilerDriver&)>(ArtInitQuickCompilerContext);
-    compiler_ = reinterpret_cast<CompilerFn>(ArtQuickCompileMethod);
-  }
-
   dex_to_dex_compiler_ = reinterpret_cast<DexToDexCompilerFn>(ArtCompileDEX);
 
-#ifdef ART_SEA_IR_MODE
-  sea_ir_compiler_ = NULL;
-  if (Runtime::Current()->IsSeaIRMode()) {
-    sea_ir_compiler_ = reinterpret_cast<CompilerFn>(SeaIrCompileMethod);
-  }
-#endif
-
-  init_compiler_context(*this);
-
-  if (compiler_backend_ == kPortable) {
-    jni_compiler_ = reinterpret_cast<JniCompilerFn>(ArtLLVMJniCompileMethod);
-  } else {
-    jni_compiler_ = reinterpret_cast<JniCompilerFn>(ArtQuickJniCompileMethod);
-  }
+  compiler_backend_->Init(*this);
 
   CHECK(!Runtime::Current()->IsStarted());
   if (!image_) {
@@ -449,16 +379,7 @@
     STLDeleteElements(&classes_to_patch_);
   }
   CHECK_PTHREAD_CALL(pthread_key_delete, (tls_key_), "delete tls key");
-  typedef void (*UninitCompilerContextFn)(CompilerDriver&);
-  UninitCompilerContextFn uninit_compiler_context;
-  // Uninitialize compiler_context_
-  // TODO: rework to combine initialization/uninitialization
-  if (compiler_backend_ == kPortable) {
-    uninit_compiler_context = reinterpret_cast<void (*)(CompilerDriver&)>(ArtUnInitCompilerContext);
-  } else {
-    uninit_compiler_context = reinterpret_cast<void (*)(CompilerDriver&)>(ArtUnInitQuickCompilerContext);
-  }
-  uninit_compiler_context(*this);
+  compiler_backend_->UnInit(*this);
 }
 
 CompilerTls* CompilerDriver::GetTls() {
@@ -1153,7 +1074,7 @@
   *direct_method = 0;
   bool use_dex_cache = false;
   const bool compiling_boot = Runtime::Current()->GetHeap()->IsCompilingBoot();
-  if (compiler_backend_ == kPortable) {
+  if (compiler_backend_->IsPortable()) {
     if (sharp_type != kStatic && sharp_type != kDirect) {
       return;
     }
@@ -1230,23 +1151,13 @@
         CHECK(!method->IsAbstract());
         *type = sharp_type;
         *direct_method = reinterpret_cast<uintptr_t>(method);
-        if (compiler_backend_ == kQuick) {
-          *direct_code = reinterpret_cast<uintptr_t>(method->GetEntryPointFromQuickCompiledCode());
-        } else {
-          CHECK_EQ(compiler_backend_, kPortable);
-          *direct_code = reinterpret_cast<uintptr_t>(method->GetEntryPointFromPortableCompiledCode());
-        }
+        *direct_code = compiler_backend_->GetEntryPointOf(method);
         target_method->dex_file = method->GetDeclaringClass()->GetDexCache()->GetDexFile();
         target_method->dex_method_index = method->GetDexMethodIndex();
       } else if (!must_use_direct_pointers) {
         // Set the code and rely on the dex cache for the method.
         *type = sharp_type;
-        if (compiler_backend_ == kQuick) {
-          *direct_code = reinterpret_cast<uintptr_t>(method->GetEntryPointFromQuickCompiledCode());
-        } else {
-          CHECK_EQ(compiler_backend_, kPortable);
-          *direct_code = reinterpret_cast<uintptr_t>(method->GetEntryPointFromPortableCompiledCode());
-        }
+        *direct_code = compiler_backend_->GetEntryPointOf(method);
       } else {
         // Direct pointers were required but none were available.
         VLOG(compiler) << "Dex cache devirtualization failed for: " << PrettyMethod(method);
@@ -2417,7 +2328,7 @@
   uint64_t start_ns = NanoTime();
 
   if ((access_flags & kAccNative) != 0) {
-    compiled_method = (*jni_compiler_)(*this, access_flags, method_idx, dex_file);
+    compiled_method = compiler_backend_->JniCompile(*this, access_flags, method_idx, dex_file);
     CHECK(compiled_method != NULL);
   } else if ((access_flags & kAccAbstract) != 0) {
   } else {
@@ -2425,19 +2336,10 @@
     bool compile = VerificationResults::IsCandidateForCompilation(method_ref, access_flags);
 
     if (compile) {
-      CompilerFn compiler = compiler_;
-#ifdef ART_SEA_IR_MODE
-      bool use_sea = Runtime::Current()->IsSeaIRMode();
-      use_sea = use_sea &&
-          (std::string::npos != PrettyMethod(method_idx, dex_file).find("fibonacci"));
-      if (use_sea) {
-        compiler = sea_ir_compiler_;
-        LOG(INFO) << "Using SEA IR to compile..." << std::endl;
-      }
-#endif
       // NOTE: if compiler declines to compile this method, it will return NULL.
-      compiled_method = (*compiler)(*this, code_item, access_flags, invoke_type, class_def_idx,
-                                    method_idx, class_loader, dex_file);
+      compiled_method = compiler_backend_->Compile(
+          *this, code_item, access_flags, invoke_type, class_def_idx,
+          method_idx, class_loader, dex_file);
     } else if (dex_to_dex_compilation_level != kDontDexToDexCompile) {
       // TODO: add a mode to disable DEX-to-DEX compilation ?
       (*dex_to_dex_compiler_)(*this, code_item, access_flags,
@@ -2447,12 +2349,7 @@
     }
   }
   uint64_t duration_ns = NanoTime() - start_ns;
-#ifdef ART_USE_PORTABLE_COMPILER
-  const uint64_t kWarnMilliSeconds = 1000;
-#else
-  const uint64_t kWarnMilliSeconds = 100;
-#endif
-  if (duration_ns > MsToNs(kWarnMilliSeconds)) {
+  if (duration_ns > MsToNs(compiler_backend_->GetMaximumCompilationTimeBeforeWarning())) {
     LOG(WARNING) << "Compilation of " << PrettyMethod(method_idx, dex_file)
                  << " took " << PrettyDuration(duration_ns);
   }
@@ -2549,11 +2446,7 @@
                               OatWriter& oat_writer,
                               art::File* file)
     SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
-#if defined(ART_USE_PORTABLE_COMPILER)
-  return art::ElfWriterMclinker::Create(file, oat_writer, dex_files, android_root, is_host, *this);
-#else
-  return art::ElfWriterQuick::Create(file, oat_writer, dex_files, android_root, is_host, *this);
-#endif
+  return compiler_backend_->WriteElf(file, oat_writer, dex_files, android_root, is_host, *this);
 }
 void CompilerDriver::InstructionSetToLLVMTarget(InstructionSet instruction_set,
                                                 std::string& target_triple,
diff --git a/compiler/driver/compiler_driver.h b/compiler/driver/compiler_driver.h
index c4ac9db..a9e029d 100644
--- a/compiler/driver/compiler_driver.h
+++ b/compiler/driver/compiler_driver.h
@@ -26,6 +26,7 @@
 #include "class_reference.h"
 #include "compiled_class.h"
 #include "compiled_method.h"
+#include "compiler_backend.h"
 #include "dex_file.h"
 #include "dex/arena_allocator.h"
 #include "instruction_set.h"
@@ -44,21 +45,15 @@
 }  // namespace verifier
 
 class AOTCompilationStats;
-class ParallelCompilationManager;
 class DexCompilationUnit;
 class DexFileToMethodInlinerMap;
 class InlineIGetIPutData;
 class OatWriter;
+class ParallelCompilationManager;
 class TimingLogger;
 class VerificationResults;
 class VerifiedMethod;
 
-enum CompilerBackend {
-  kQuick,
-  kPortable,
-  kNoBackend
-};
-
 enum EntryPointCallingConvention {
   // ABI of invocations to a method's interpreter entry point.
   kInterpreterAbi,
@@ -101,7 +96,8 @@
   // classes.
   explicit CompilerDriver(VerificationResults* verification_results,
                           DexFileToMethodInlinerMap* method_inliner_map,
-                          CompilerBackend compiler_backend, InstructionSet instruction_set,
+                          CompilerBackend::Kind compiler_backend_kind,
+                          InstructionSet instruction_set,
                           InstructionSetFeatures instruction_set_features,
                           bool image, DescriptorSet* image_classes,
                           size_t thread_count, bool dump_stats, bool dump_passes,
@@ -133,8 +129,8 @@
     return instruction_set_features_;
   }
 
-  CompilerBackend GetCompilerBackend() const {
-    return compiler_backend_;
+  CompilerBackend* GetCompilerBackend() const {
+    return compiler_backend_.get();
   }
 
   // Are we compiling and creating an image file?
@@ -560,7 +556,7 @@
   VerificationResults* verification_results_;
   DexFileToMethodInlinerMap* method_inliner_map_;
 
-  CompilerBackend compiler_backend_;
+  UniquePtr<CompilerBackend> compiler_backend_;
 
   const InstructionSet instruction_set_;
   const InstructionSetFeatures instruction_set_features_;
@@ -601,32 +597,16 @@
 
   void* compiler_library_;
 
-  typedef CompiledMethod* (*CompilerFn)(CompilerDriver& driver,
-                                        const DexFile::CodeItem* code_item,
-                                        uint32_t access_flags, InvokeType invoke_type,
-                                        uint32_t class_dex_idx, uint32_t method_idx,
-                                        jobject class_loader, const DexFile& dex_file);
-
   typedef void (*DexToDexCompilerFn)(CompilerDriver& driver,
                                      const DexFile::CodeItem* code_item,
                                      uint32_t access_flags, InvokeType invoke_type,
                                      uint32_t class_dex_idx, uint32_t method_idx,
                                      jobject class_loader, const DexFile& dex_file,
                                      DexToDexCompilationLevel dex_to_dex_compilation_level);
-  CompilerFn compiler_;
-#ifdef ART_SEA_IR_MODE
-  CompilerFn sea_ir_compiler_;
-#endif
-
   DexToDexCompilerFn dex_to_dex_compiler_;
 
   void* compiler_context_;
 
-  typedef CompiledMethod* (*JniCompilerFn)(CompilerDriver& driver,
-                                           uint32_t access_flags, uint32_t method_idx,
-                                           const DexFile& dex_file);
-  JniCompilerFn jni_compiler_;
-
   pthread_key_t tls_key_;
 
   // Arena pool used by the compiler.
diff --git a/compiler/llvm/compiler_llvm.cc b/compiler/llvm/compiler_llvm.cc
index 6563eb5..a5acd2a 100644
--- a/compiler/llvm/compiler_llvm.cc
+++ b/compiler/llvm/compiler_llvm.cc
@@ -39,12 +39,12 @@
 
 namespace art {
 void CompileOneMethod(CompilerDriver& driver,
-                      const CompilerBackend compilerBackend,
+                      CompilerBackend* compilerBackend,
                       const DexFile::CodeItem* code_item,
                       uint32_t access_flags, InvokeType invoke_type,
                       uint16_t class_def_idx, uint32_t method_idx, jobject class_loader,
                       const DexFile& dex_file,
-                      llvm::LlvmCompilationUnit* llvm_info);
+                      void* llvm_info);
 }
 
 namespace llvm {
@@ -142,7 +142,7 @@
   cunit->SetCompilerDriver(compiler_driver_);
   // TODO: consolidate ArtCompileMethods
   CompileOneMethod(*compiler_driver_,
-                   kPortable,
+                   compiler_driver_->GetCompilerBackend(),
                    dex_compilation_unit->GetCodeItem(),
                    dex_compilation_unit->GetAccessFlags(),
                    invoke_type,
diff --git a/compiler/oat_test.cc b/compiler/oat_test.cc
index f6b511c..10d2c5c 100644
--- a/compiler/oat_test.cc
+++ b/compiler/oat_test.cc
@@ -15,6 +15,7 @@
  */
 
 #include "compiler/oat_writer.h"
+#include "compiler/compiler_backend.h"
 #include "mirror/art_method-inl.h"
 #include "mirror/class-inl.h"
 #include "mirror/object_array-inl.h"
@@ -84,12 +85,14 @@
   ClassLinker* class_linker = Runtime::Current()->GetClassLinker();
 
   // TODO: make selectable.
-  CompilerBackend compiler_backend = kUsePortableCompiler ? kPortable : kQuick;
+  CompilerBackend::Kind compiler_backend = kUsePortableCompiler
+      ? CompilerBackend::kPortable
+      : CompilerBackend::kQuick;
   InstructionSet insn_set = kIsTargetBuild ? kThumb2 : kX86;
 
   InstructionSetFeatures insn_features;
   verification_results_.reset(new VerificationResults);
-  method_inliner_map_.reset(compiler_backend == kQuick ? new DexFileToMethodInlinerMap : nullptr);
+  method_inliner_map_.reset(new DexFileToMethodInlinerMap);
   callbacks_.Reset(verification_results_.get(), method_inliner_map_.get());
   timer_.reset(new CumulativeLogger("Compilation times"));
   compiler_driver_.reset(new CompilerDriver(verification_results_.get(),
diff --git a/compiler/sea_ir/frontend.cc b/compiler/sea_ir/frontend.cc
index 6c779c8..b57007b 100644
--- a/compiler/sea_ir/frontend.cc
+++ b/compiler/sea_ir/frontend.cc
@@ -38,15 +38,12 @@
 namespace art {
 
 static CompiledMethod* CompileMethodWithSeaIr(CompilerDriver& compiler,
-                                     const CompilerBackend compiler_backend,
+                                     CompilerBackend* compiler_backend,
                                      const DexFile::CodeItem* code_item,
                                      uint32_t method_access_flags, InvokeType invoke_type,
                                      uint16_t class_def_idx, uint32_t method_idx,
-                                     jobject class_loader, const DexFile& dex_file
-#if defined(ART_USE_PORTABLE_COMPILER)
-                                     , llvm::LlvmCompilationUnit* llvm_compilation_unit
-#endif
-) {
+                                     jobject class_loader, const DexFile& dex_file,
+                                     void* llvm_compilation_unit) {
   LOG(INFO) << "Compiling " << PrettyMethod(method_idx, dex_file) << ".";
   sea_ir::SeaGraph* ir_graph = sea_ir::SeaGraph::GetGraph(dex_file);
   std::string symbol = "dex_" + MangleForJni(PrettyMethod(method_idx, dex_file));
@@ -65,7 +62,7 @@
 }
 
 CompiledMethod* SeaIrCompileOneMethod(CompilerDriver& compiler,
-                                 const CompilerBackend backend,
+                                 CompilerBackend* backend,
                                  const DexFile::CodeItem* code_item,
                                  uint32_t method_access_flags,
                                  InvokeType invoke_type,
@@ -73,13 +70,9 @@
                                  uint32_t method_idx,
                                  jobject class_loader,
                                  const DexFile& dex_file,
-                                 llvm::LlvmCompilationUnit* llvm_compilation_unit) {
+                                 void* llvm_compilation_unit) {
   return CompileMethodWithSeaIr(compiler, backend, code_item, method_access_flags, invoke_type,
-      class_def_idx, method_idx, class_loader, dex_file
-#if defined(ART_USE_PORTABLE_COMPILER)
-                       , llvm_compilation_unit
-#endif
-                       );  // NOLINT
+      class_def_idx, method_idx, class_loader, dex_file, llvm_compilation_unit);
 }
 
 extern "C" art::CompiledMethod*
@@ -90,7 +83,7 @@
                           const art::DexFile& dex_file) {
   // TODO: Check method fingerprint here to determine appropriate backend type.
   //       Until then, use build default
-  art::CompilerBackend backend = compiler.GetCompilerBackend();
+  art::CompilerBackend* backend = compiler.GetCompilerBackend();
   return art::SeaIrCompileOneMethod(compiler, backend, code_item, method_access_flags, invoke_type,
                                class_def_idx, method_idx, class_loader, dex_file,
                                NULL /* use thread llvm_info */);
diff --git a/dex2oat/dex2oat.cc b/dex2oat/dex2oat.cc
index 98c64aa..7f88471 100644
--- a/dex2oat/dex2oat.cc
+++ b/dex2oat/dex2oat.cc
@@ -30,6 +30,7 @@
 #include "base/timing_logger.h"
 #include "base/unix_file/fd_file.h"
 #include "class_linker.h"
+#include "compiler_backend.h"
 #include "compiler_callbacks.h"
 #include "dex_file-inl.h"
 #include "dex/verification_results.h"
@@ -163,7 +164,7 @@
  public:
   static bool Create(Dex2Oat** p_dex2oat,
                      Runtime::Options& options,
-                     CompilerBackend compiler_backend,
+                     CompilerBackend::Kind compiler_backend,
                      InstructionSet instruction_set,
                      InstructionSetFeatures instruction_set_features,
                      size_t thread_count)
@@ -286,7 +287,7 @@
                                                         dump_passes,
                                                         &compiler_phases_timings));
 
-    if (compiler_backend_ == kPortable) {
+    if (compiler_backend_ == CompilerBackend::kPortable) {
       driver->SetBitcodeFileName(bitcode_filename);
     }
 
@@ -365,7 +366,7 @@
       virtual bool MethodVerified(verifier::MethodVerifier* verifier)
           SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
         bool result = verification_results_->ProcessVerifiedMethod(verifier);
-        if (result && method_inliner_map_ != nullptr) {
+        if (result) {
           MethodReference ref = verifier->GetMethodReference();
           method_inliner_map_->GetMethodInliner(ref.dex_file)
               ->AnalyseMethodCode(verifier);
@@ -381,7 +382,7 @@
       DexFileToMethodInlinerMap* method_inliner_map_;
   };
 
-  explicit Dex2Oat(CompilerBackend compiler_backend,
+  explicit Dex2Oat(CompilerBackend::Kind compiler_backend,
                    InstructionSet instruction_set,
                    InstructionSetFeatures instruction_set_features,
                    size_t thread_count)
@@ -389,7 +390,7 @@
         instruction_set_(instruction_set),
         instruction_set_features_(instruction_set_features),
         verification_results_(new VerificationResults),
-        method_inliner_map_(compiler_backend == kQuick ? new DexFileToMethodInlinerMap : nullptr),
+        method_inliner_map_(new DexFileToMethodInlinerMap),
         callbacks_(verification_results_.get(), method_inliner_map_.get()),
         runtime_(nullptr),
         thread_count_(thread_count),
@@ -449,7 +450,7 @@
     return false;
   }
 
-  const CompilerBackend compiler_backend_;
+  const CompilerBackend::Kind compiler_backend_;
 
   const InstructionSet instruction_set_;
   const InstructionSetFeatures instruction_set_features_;
@@ -688,7 +689,9 @@
   std::string android_root;
   std::vector<const char*> runtime_args;
   int thread_count = sysconf(_SC_NPROCESSORS_CONF);
-  CompilerBackend compiler_backend = kUsePortableCompiler ? kPortable : kQuick;
+  CompilerBackend::Kind compiler_backend = kUsePortableCompiler
+      ? CompilerBackend::kPortable
+      : CompilerBackend::kQuick;
 
   // Take the default set of instruction features from the build.
   InstructionSetFeatures instruction_set_features =
@@ -788,9 +791,9 @@
     } else if (option.starts_with("--compiler-backend=")) {
       StringPiece backend_str = option.substr(strlen("--compiler-backend=")).data();
       if (backend_str == "Quick") {
-        compiler_backend = kQuick;
+        compiler_backend = CompilerBackend::kQuick;
       } else if (backend_str == "Portable") {
-        compiler_backend = kPortable;
+        compiler_backend = CompilerBackend::kPortable;
       }
     } else if (option == "--host") {
       is_host = true;
diff --git a/runtime/common_test.h b/runtime/common_test.h
index f7859ea..a94cbfc 100644
--- a/runtime/common_test.h
+++ b/runtime/common_test.h
@@ -25,6 +25,7 @@
 #include <fstream>
 
 #include "../../external/icu4c/common/unicode/uvernum.h"
+#include "../compiler/compiler_backend.h"
 #include "../compiler/dex/quick/dex_file_to_method_inliner_map.h"
 #include "../compiler/dex/verification_results.h"
 #include "../compiler/driver/compiler_driver.h"
@@ -439,10 +440,12 @@
     std::string max_heap_string(StringPrintf("-Xmx%zdm", gc::Heap::kDefaultMaximumSize / MB));
 
     // TODO: make selectable
-    CompilerBackend compiler_backend = kUsePortableCompiler ? kPortable : kQuick;
+    CompilerBackend::Kind compiler_backend = kUsePortableCompiler
+        ? CompilerBackend::kPortable
+        : CompilerBackend::kQuick;
 
     verification_results_.reset(new VerificationResults);
-    method_inliner_map_.reset(compiler_backend == kQuick ? new DexFileToMethodInlinerMap : nullptr);
+    method_inliner_map_.reset(new DexFileToMethodInlinerMap);
     callbacks_.Reset(verification_results_.get(), method_inliner_map_.get());
     Runtime::Options options;
     options.push_back(std::make_pair("compilercallbacks", static_cast<CompilerCallbacks*>(&callbacks_)));