Merge "Add more info to monitor contention logging" into nyc-dev
diff --git a/compiler/debug/elf_debug_writer.cc b/compiler/debug/elf_debug_writer.cc
index 4dd8024..b7e000a 100644
--- a/compiler/debug/elf_debug_writer.cc
+++ b/compiler/debug/elf_debug_writer.cc
@@ -110,7 +110,7 @@
 }
 
 template <typename ElfTypes>
-static ArrayRef<const uint8_t> WriteDebugElfFileForMethodsInternal(
+static std::vector<uint8_t> WriteDebugElfFileForMethodsInternal(
     InstructionSet isa,
     const InstructionSetFeatures* features,
     const ArrayRef<const MethodDebugInfo>& method_infos) {
@@ -126,14 +126,10 @@
                  false /* write_oat_patches */);
   builder->End();
   CHECK(builder->Good());
-  // Make a copy of the buffer.  We want to shrink it anyway.
-  uint8_t* result = new uint8_t[buffer.size()];
-  CHECK(result != nullptr);
-  memcpy(result, buffer.data(), buffer.size());
-  return ArrayRef<const uint8_t>(result, buffer.size());
+  return buffer;
 }
 
-ArrayRef<const uint8_t> WriteDebugElfFileForMethods(
+std::vector<uint8_t> WriteDebugElfFileForMethods(
     InstructionSet isa,
     const InstructionSetFeatures* features,
     const ArrayRef<const MethodDebugInfo>& method_infos) {
@@ -145,7 +141,7 @@
 }
 
 template <typename ElfTypes>
-static ArrayRef<const uint8_t> WriteDebugElfFileForClassesInternal(
+static std::vector<uint8_t> WriteDebugElfFileForClassesInternal(
     InstructionSet isa,
     const InstructionSetFeatures* features,
     const ArrayRef<mirror::Class*>& types)
@@ -164,16 +160,12 @@
 
   builder->End();
   CHECK(builder->Good());
-  // Make a copy of the buffer.  We want to shrink it anyway.
-  uint8_t* result = new uint8_t[buffer.size()];
-  CHECK(result != nullptr);
-  memcpy(result, buffer.data(), buffer.size());
-  return ArrayRef<const uint8_t>(result, buffer.size());
+  return buffer;
 }
 
-ArrayRef<const uint8_t> WriteDebugElfFileForClasses(InstructionSet isa,
-                                                    const InstructionSetFeatures* features,
-                                                    const ArrayRef<mirror::Class*>& types) {
+std::vector<uint8_t> WriteDebugElfFileForClasses(InstructionSet isa,
+                                                 const InstructionSetFeatures* features,
+                                                 const ArrayRef<mirror::Class*>& types) {
   if (Is64BitInstructionSet(isa)) {
     return WriteDebugElfFileForClassesInternal<ElfTypes64>(isa, features, types);
   } else {
diff --git a/compiler/debug/elf_debug_writer.h b/compiler/debug/elf_debug_writer.h
index 736370e..6f52249 100644
--- a/compiler/debug/elf_debug_writer.h
+++ b/compiler/debug/elf_debug_writer.h
@@ -47,12 +47,12 @@
     size_t text_section_size,
     const ArrayRef<const MethodDebugInfo>& method_infos);
 
-ArrayRef<const uint8_t> WriteDebugElfFileForMethods(
+std::vector<uint8_t> WriteDebugElfFileForMethods(
     InstructionSet isa,
     const InstructionSetFeatures* features,
     const ArrayRef<const MethodDebugInfo>& method_infos);
 
-ArrayRef<const uint8_t> WriteDebugElfFileForClasses(
+std::vector<uint8_t> WriteDebugElfFileForClasses(
     InstructionSet isa,
     const InstructionSetFeatures* features,
     const ArrayRef<mirror::Class*>& types)
diff --git a/compiler/driver/compiler_driver.cc b/compiler/driver/compiler_driver.cc
index 5294068..8bdff21 100644
--- a/compiler/driver/compiler_driver.cc
+++ b/compiler/driver/compiler_driver.cc
@@ -416,23 +416,27 @@
                                 type ## _ENTRYPOINT_OFFSET(4, offset)); \
     }
 
-const std::vector<uint8_t>* CompilerDriver::CreateJniDlsymLookup() const {
+std::unique_ptr<const std::vector<uint8_t>> CompilerDriver::CreateJniDlsymLookup() const {
   CREATE_TRAMPOLINE(JNI, kJniAbi, pDlsymLookup)
 }
 
-const std::vector<uint8_t>* CompilerDriver::CreateQuickGenericJniTrampoline() const {
+std::unique_ptr<const std::vector<uint8_t>> CompilerDriver::CreateQuickGenericJniTrampoline()
+    const {
   CREATE_TRAMPOLINE(QUICK, kQuickAbi, pQuickGenericJniTrampoline)
 }
 
-const std::vector<uint8_t>* CompilerDriver::CreateQuickImtConflictTrampoline() const {
+std::unique_ptr<const std::vector<uint8_t>> CompilerDriver::CreateQuickImtConflictTrampoline()
+    const {
   CREATE_TRAMPOLINE(QUICK, kQuickAbi, pQuickImtConflictTrampoline)
 }
 
-const std::vector<uint8_t>* CompilerDriver::CreateQuickResolutionTrampoline() const {
+std::unique_ptr<const std::vector<uint8_t>> CompilerDriver::CreateQuickResolutionTrampoline()
+    const {
   CREATE_TRAMPOLINE(QUICK, kQuickAbi, pQuickResolutionTrampoline)
 }
 
-const std::vector<uint8_t>* CompilerDriver::CreateQuickToInterpreterBridge() const {
+std::unique_ptr<const std::vector<uint8_t>> CompilerDriver::CreateQuickToInterpreterBridge()
+    const {
   CREATE_TRAMPOLINE(QUICK, kQuickAbi, pQuickToInterpreterBridge)
 }
 #undef CREATE_TRAMPOLINE
diff --git a/compiler/driver/compiler_driver.h b/compiler/driver/compiler_driver.h
index 905f84d..4308eac 100644
--- a/compiler/driver/compiler_driver.h
+++ b/compiler/driver/compiler_driver.h
@@ -161,11 +161,11 @@
   }
 
   // Generate the trampolines that are invoked by unresolved direct methods.
-  const std::vector<uint8_t>* CreateJniDlsymLookup() const;
-  const std::vector<uint8_t>* CreateQuickGenericJniTrampoline() const;
-  const std::vector<uint8_t>* CreateQuickImtConflictTrampoline() const;
-  const std::vector<uint8_t>* CreateQuickResolutionTrampoline() const;
-  const std::vector<uint8_t>* CreateQuickToInterpreterBridge() const;
+  std::unique_ptr<const std::vector<uint8_t>> CreateJniDlsymLookup() const;
+  std::unique_ptr<const std::vector<uint8_t>> CreateQuickGenericJniTrampoline() const;
+  std::unique_ptr<const std::vector<uint8_t>> CreateQuickImtConflictTrampoline() const;
+  std::unique_ptr<const std::vector<uint8_t>> CreateQuickResolutionTrampoline() const;
+  std::unique_ptr<const std::vector<uint8_t>> CreateQuickToInterpreterBridge() const;
 
   CompiledClass* GetCompiledClass(ClassReference ref) const
       REQUIRES(!compiled_classes_lock_);
diff --git a/compiler/jit/jit_compiler.cc b/compiler/jit/jit_compiler.cc
index cda2e27..c8dfc93 100644
--- a/compiler/jit/jit_compiler.cc
+++ b/compiler/jit/jit_compiler.cc
@@ -69,9 +69,9 @@
   DCHECK(jit_compiler != nullptr);
   if (jit_compiler->GetCompilerOptions()->GetGenerateDebugInfo()) {
     const ArrayRef<mirror::Class*> types_array(types, count);
-    ArrayRef<const uint8_t> elf_file = debug::WriteDebugElfFileForClasses(
+    std::vector<uint8_t> elf_file = debug::WriteDebugElfFileForClasses(
         kRuntimeISA, jit_compiler->GetCompilerDriver()->GetInstructionSetFeatures(), types_array);
-    CreateJITCodeEntry(std::unique_ptr<const uint8_t[]>(elf_file.data()), elf_file.size());
+    CreateJITCodeEntry(std::move(elf_file));
   }
 }
 
diff --git a/compiler/jni/jni_cfi_test.cc b/compiler/jni/jni_cfi_test.cc
index 8832c84..05c85e0 100644
--- a/compiler/jni/jni_cfi_test.cc
+++ b/compiler/jni/jni_cfi_test.cc
@@ -18,6 +18,7 @@
 #include <vector>
 
 #include "arch/instruction_set.h"
+#include "base/arena_allocator.h"
 #include "cfi_test.h"
 #include "gtest/gtest.h"
 #include "jni/quick/calling_convention.h"
@@ -42,15 +43,19 @@
     const bool is_static = true;
     const bool is_synchronized = false;
     const char* shorty = "IIFII";
+
+    ArenaPool pool;
+    ArenaAllocator arena(&pool);
+
     std::unique_ptr<JniCallingConvention> jni_conv(
-        JniCallingConvention::Create(is_static, is_synchronized, shorty, isa));
+        JniCallingConvention::Create(&arena, is_static, is_synchronized, shorty, isa));
     std::unique_ptr<ManagedRuntimeCallingConvention> mr_conv(
-        ManagedRuntimeCallingConvention::Create(is_static, is_synchronized, shorty, isa));
+        ManagedRuntimeCallingConvention::Create(&arena, is_static, is_synchronized, shorty, isa));
     const int frame_size(jni_conv->FrameSize());
     const std::vector<ManagedRegister>& callee_save_regs = jni_conv->CalleeSaveRegisters();
 
     // Assemble the method.
-    std::unique_ptr<Assembler> jni_asm(Assembler::Create(isa));
+    std::unique_ptr<Assembler> jni_asm(Assembler::Create(&arena, isa));
     jni_asm->cfi().SetEnabled(true);
     jni_asm->BuildFrame(frame_size, mr_conv->MethodRegister(),
                         callee_save_regs, mr_conv->EntrySpills());
diff --git a/compiler/jni/quick/calling_convention.cc b/compiler/jni/quick/calling_convention.cc
index cef8c5d..e21f554 100644
--- a/compiler/jni/quick/calling_convention.cc
+++ b/compiler/jni/quick/calling_convention.cc
@@ -46,37 +46,51 @@
 
 // Managed runtime calling convention
 
-ManagedRuntimeCallingConvention* ManagedRuntimeCallingConvention::Create(
-    bool is_static, bool is_synchronized, const char* shorty, InstructionSet instruction_set) {
+std::unique_ptr<ManagedRuntimeCallingConvention> ManagedRuntimeCallingConvention::Create(
+    ArenaAllocator* arena,
+    bool is_static,
+    bool is_synchronized,
+    const char* shorty,
+    InstructionSet instruction_set) {
   switch (instruction_set) {
 #ifdef ART_ENABLE_CODEGEN_arm
     case kArm:
     case kThumb2:
-      return new arm::ArmManagedRuntimeCallingConvention(is_static, is_synchronized, shorty);
+      return std::unique_ptr<ManagedRuntimeCallingConvention>(
+          new (arena) arm::ArmManagedRuntimeCallingConvention(is_static, is_synchronized, shorty));
 #endif
 #ifdef ART_ENABLE_CODEGEN_arm64
     case kArm64:
-      return new arm64::Arm64ManagedRuntimeCallingConvention(is_static, is_synchronized, shorty);
+      return std::unique_ptr<ManagedRuntimeCallingConvention>(
+          new (arena) arm64::Arm64ManagedRuntimeCallingConvention(
+              is_static, is_synchronized, shorty));
 #endif
 #ifdef ART_ENABLE_CODEGEN_mips
     case kMips:
-      return new mips::MipsManagedRuntimeCallingConvention(is_static, is_synchronized, shorty);
+      return std::unique_ptr<ManagedRuntimeCallingConvention>(
+          new (arena) mips::MipsManagedRuntimeCallingConvention(
+              is_static, is_synchronized, shorty));
 #endif
 #ifdef ART_ENABLE_CODEGEN_mips64
     case kMips64:
-      return new mips64::Mips64ManagedRuntimeCallingConvention(is_static, is_synchronized, shorty);
+      return std::unique_ptr<ManagedRuntimeCallingConvention>(
+          new (arena) mips64::Mips64ManagedRuntimeCallingConvention(
+              is_static, is_synchronized, shorty));
 #endif
 #ifdef ART_ENABLE_CODEGEN_x86
     case kX86:
-      return new x86::X86ManagedRuntimeCallingConvention(is_static, is_synchronized, shorty);
+      return std::unique_ptr<ManagedRuntimeCallingConvention>(
+          new (arena) x86::X86ManagedRuntimeCallingConvention(is_static, is_synchronized, shorty));
 #endif
 #ifdef ART_ENABLE_CODEGEN_x86_64
     case kX86_64:
-      return new x86_64::X86_64ManagedRuntimeCallingConvention(is_static, is_synchronized, shorty);
+      return std::unique_ptr<ManagedRuntimeCallingConvention>(
+          new (arena) x86_64::X86_64ManagedRuntimeCallingConvention(
+              is_static, is_synchronized, shorty));
 #endif
     default:
       LOG(FATAL) << "Unknown InstructionSet: " << instruction_set;
-      return nullptr;
+      UNREACHABLE();
   }
 }
 
@@ -132,38 +146,46 @@
 
 // JNI calling convention
 
-JniCallingConvention* JniCallingConvention::Create(bool is_static, bool is_synchronized,
-                                                   const char* shorty,
-                                                   InstructionSet instruction_set) {
+std::unique_ptr<JniCallingConvention> JniCallingConvention::Create(ArenaAllocator* arena,
+                                                                   bool is_static,
+                                                                   bool is_synchronized,
+                                                                   const char* shorty,
+                                                                   InstructionSet instruction_set) {
   switch (instruction_set) {
 #ifdef ART_ENABLE_CODEGEN_arm
     case kArm:
     case kThumb2:
-      return new arm::ArmJniCallingConvention(is_static, is_synchronized, shorty);
+      return std::unique_ptr<JniCallingConvention>(
+          new (arena) arm::ArmJniCallingConvention(is_static, is_synchronized, shorty));
 #endif
 #ifdef ART_ENABLE_CODEGEN_arm64
     case kArm64:
-      return new arm64::Arm64JniCallingConvention(is_static, is_synchronized, shorty);
+      return std::unique_ptr<JniCallingConvention>(
+          new (arena) arm64::Arm64JniCallingConvention(is_static, is_synchronized, shorty));
 #endif
 #ifdef ART_ENABLE_CODEGEN_mips
     case kMips:
-      return new mips::MipsJniCallingConvention(is_static, is_synchronized, shorty);
+      return std::unique_ptr<JniCallingConvention>(
+          new (arena) mips::MipsJniCallingConvention(is_static, is_synchronized, shorty));
 #endif
 #ifdef ART_ENABLE_CODEGEN_mips64
     case kMips64:
-      return new mips64::Mips64JniCallingConvention(is_static, is_synchronized, shorty);
+      return std::unique_ptr<JniCallingConvention>(
+          new (arena) mips64::Mips64JniCallingConvention(is_static, is_synchronized, shorty));
 #endif
 #ifdef ART_ENABLE_CODEGEN_x86
     case kX86:
-      return new x86::X86JniCallingConvention(is_static, is_synchronized, shorty);
+      return std::unique_ptr<JniCallingConvention>(
+          new (arena) x86::X86JniCallingConvention(is_static, is_synchronized, shorty));
 #endif
 #ifdef ART_ENABLE_CODEGEN_x86_64
     case kX86_64:
-      return new x86_64::X86_64JniCallingConvention(is_static, is_synchronized, shorty);
+      return std::unique_ptr<JniCallingConvention>(
+          new (arena) x86_64::X86_64JniCallingConvention(is_static, is_synchronized, shorty));
 #endif
     default:
       LOG(FATAL) << "Unknown InstructionSet: " << instruction_set;
-      return nullptr;
+      UNREACHABLE();
   }
 }
 
diff --git a/compiler/jni/quick/calling_convention.h b/compiler/jni/quick/calling_convention.h
index 243d124..2c4b15c 100644
--- a/compiler/jni/quick/calling_convention.h
+++ b/compiler/jni/quick/calling_convention.h
@@ -18,6 +18,8 @@
 #define ART_COMPILER_JNI_QUICK_CALLING_CONVENTION_H_
 
 #include <vector>
+
+#include "base/arena_object.h"
 #include "handle_scope.h"
 #include "primitive.h"
 #include "thread.h"
@@ -26,7 +28,7 @@
 namespace art {
 
 // Top-level abstraction for different calling conventions.
-class CallingConvention {
+class CallingConvention : public DeletableArenaObject<kArenaAllocCallingConvention> {
  public:
   bool IsReturnAReference() const { return shorty_[0] == 'L'; }
 
@@ -221,9 +223,11 @@
 // | { Method* }             | <-- SP
 class ManagedRuntimeCallingConvention : public CallingConvention {
  public:
-  static ManagedRuntimeCallingConvention* Create(bool is_static, bool is_synchronized,
-                                                 const char* shorty,
-                                                 InstructionSet instruction_set);
+  static std::unique_ptr<ManagedRuntimeCallingConvention> Create(ArenaAllocator* arena,
+                                                                 bool is_static,
+                                                                 bool is_synchronized,
+                                                                 const char* shorty,
+                                                                 InstructionSet instruction_set);
 
   // Register that holds the incoming method argument
   virtual ManagedRegister MethodRegister() = 0;
@@ -249,7 +253,9 @@
   virtual const ManagedRegisterEntrySpills& EntrySpills() = 0;
 
  protected:
-  ManagedRuntimeCallingConvention(bool is_static, bool is_synchronized, const char* shorty,
+  ManagedRuntimeCallingConvention(bool is_static,
+                                  bool is_synchronized,
+                                  const char* shorty,
                                   size_t frame_pointer_size)
       : CallingConvention(is_static, is_synchronized, shorty, frame_pointer_size) {}
 };
@@ -270,8 +276,11 @@
 // callee saves for frames above this one.
 class JniCallingConvention : public CallingConvention {
  public:
-  static JniCallingConvention* Create(bool is_static, bool is_synchronized, const char* shorty,
-                                      InstructionSet instruction_set);
+  static std::unique_ptr<JniCallingConvention> Create(ArenaAllocator* arena,
+                                                      bool is_static,
+                                                      bool is_synchronized,
+                                                      const char* shorty,
+                                                      InstructionSet instruction_set);
 
   // Size of frame excluding space for outgoing args (its assumed Method* is
   // always at the bottom of a frame, but this doesn't work for outgoing
diff --git a/compiler/jni/quick/jni_compiler.cc b/compiler/jni/quick/jni_compiler.cc
index b8cda24..27714b8 100644
--- a/compiler/jni/quick/jni_compiler.cc
+++ b/compiler/jni/quick/jni_compiler.cc
@@ -22,6 +22,7 @@
 #include <fstream>
 
 #include "art_method.h"
+#include "base/arena_allocator.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "calling_convention.h"
@@ -69,13 +70,18 @@
   InstructionSet instruction_set = driver->GetInstructionSet();
   const InstructionSetFeatures* instruction_set_features = driver->GetInstructionSetFeatures();
   const bool is_64_bit_target = Is64BitInstructionSet(instruction_set);
+
+  ArenaPool pool;
+  ArenaAllocator arena(&pool);
+
   // Calling conventions used to iterate over parameters to method
   std::unique_ptr<JniCallingConvention> main_jni_conv(
-      JniCallingConvention::Create(is_static, is_synchronized, shorty, instruction_set));
+      JniCallingConvention::Create(&arena, is_static, is_synchronized, shorty, instruction_set));
   bool reference_return = main_jni_conv->IsReturnAReference();
 
   std::unique_ptr<ManagedRuntimeCallingConvention> mr_conv(
-      ManagedRuntimeCallingConvention::Create(is_static, is_synchronized, shorty, instruction_set));
+      ManagedRuntimeCallingConvention::Create(
+          &arena, is_static, is_synchronized, shorty, instruction_set));
 
   // Calling conventions to call into JNI method "end" possibly passing a returned reference, the
   //     method and the current thread.
@@ -90,11 +96,12 @@
     jni_end_shorty = "V";
   }
 
-  std::unique_ptr<JniCallingConvention> end_jni_conv(
-      JniCallingConvention::Create(is_static, is_synchronized, jni_end_shorty, instruction_set));
+  std::unique_ptr<JniCallingConvention> end_jni_conv(JniCallingConvention::Create(
+      &arena, is_static, is_synchronized, jni_end_shorty, instruction_set));
 
   // Assembler that holds generated instructions
-  std::unique_ptr<Assembler> jni_asm(Assembler::Create(instruction_set, instruction_set_features));
+  std::unique_ptr<Assembler> jni_asm(
+      Assembler::Create(&arena, instruction_set, instruction_set_features));
   jni_asm->cfi().SetEnabled(driver->GetCompilerOptions().GenerateAnyDebugInfo());
 
   // Offsets into data structures
diff --git a/compiler/linker/arm/relative_patcher_thumb2.cc b/compiler/linker/arm/relative_patcher_thumb2.cc
index 582ecb3..fa49fc4 100644
--- a/compiler/linker/arm/relative_patcher_thumb2.cc
+++ b/compiler/linker/arm/relative_patcher_thumb2.cc
@@ -79,7 +79,9 @@
 std::vector<uint8_t> Thumb2RelativePatcher::CompileThunkCode() {
   // The thunk just uses the entry point in the ArtMethod. This works even for calls
   // to the generic JNI and interpreter trampolines.
-  arm::Thumb2Assembler assembler;
+  ArenaPool pool;
+  ArenaAllocator arena(&pool);
+  arm::Thumb2Assembler assembler(&arena);
   assembler.LoadFromOffset(
       arm::kLoadWord, arm::PC, arm::R0,
       ArtMethod::EntryPointFromQuickCompiledCodeOffset(kArmPointerSize).Int32Value());
diff --git a/compiler/linker/arm64/relative_patcher_arm64.cc b/compiler/linker/arm64/relative_patcher_arm64.cc
index e3e3121..b4ecbd8 100644
--- a/compiler/linker/arm64/relative_patcher_arm64.cc
+++ b/compiler/linker/arm64/relative_patcher_arm64.cc
@@ -247,7 +247,9 @@
 std::vector<uint8_t> Arm64RelativePatcher::CompileThunkCode() {
   // The thunk just uses the entry point in the ArtMethod. This works even for calls
   // to the generic JNI and interpreter trampolines.
-  arm64::Arm64Assembler assembler;
+  ArenaPool pool;
+  ArenaAllocator arena(&pool);
+  arm64::Arm64Assembler assembler(&arena);
   Offset offset(ArtMethod::EntryPointFromQuickCompiledCodeOffset(
       kArm64PointerSize).Int32Value());
   assembler.JumpTo(ManagedRegister(arm64::X0), offset, ManagedRegister(arm64::IP0));
diff --git a/compiler/oat_writer.cc b/compiler/oat_writer.cc
index 25c671e..e804bee 100644
--- a/compiler/oat_writer.cc
+++ b/compiler/oat_writer.cc
@@ -1407,7 +1407,7 @@
       offset = CompiledCode::AlignCode(offset, instruction_set); \
       adjusted_offset = offset + CompiledCode::CodeDelta(instruction_set); \
       oat_header_->Set ## fn_name ## Offset(adjusted_offset); \
-      field.reset(compiler_driver_->Create ## fn_name()); \
+      field = compiler_driver_->Create ## fn_name(); \
       offset += field->size();
 
     DO_TRAMPOLINE(jni_dlsym_lookup_, JniDlsymLookup);
diff --git a/compiler/optimizing/code_generator.cc b/compiler/optimizing/code_generator.cc
index a771cc1..e7fa4e4 100644
--- a/compiler/optimizing/code_generator.cc
+++ b/compiler/optimizing/code_generator.cc
@@ -187,7 +187,8 @@
 
 void CodeGenerator::GenerateSlowPaths() {
   size_t code_start = 0;
-  for (SlowPathCode* slow_path : slow_paths_) {
+  for (const std::unique_ptr<SlowPathCode>& slow_path_unique_ptr : slow_paths_) {
+    SlowPathCode* slow_path = slow_path_unique_ptr.get();
     current_slow_path_ = slow_path;
     if (disasm_info_ != nullptr) {
       code_start = GetAssembler()->CodeSize();
diff --git a/compiler/optimizing/code_generator.h b/compiler/optimizing/code_generator.h
index 87832a2..d69c410 100644
--- a/compiler/optimizing/code_generator.h
+++ b/compiler/optimizing/code_generator.h
@@ -67,7 +67,7 @@
   DISALLOW_COPY_AND_ASSIGN(CodeAllocator);
 };
 
-class SlowPathCode : public ArenaObject<kArenaAllocSlowPaths> {
+class SlowPathCode : public DeletableArenaObject<kArenaAllocSlowPaths> {
  public:
   explicit SlowPathCode(HInstruction* instruction) : instruction_(instruction) {
     for (size_t i = 0; i < kMaximumNumberOfExpectedRegisters; ++i) {
@@ -205,7 +205,7 @@
   virtual const Assembler& GetAssembler() const = 0;
   virtual size_t GetWordSize() const = 0;
   virtual size_t GetFloatingPointSpillSlotSize() const = 0;
-  virtual uintptr_t GetAddressOf(HBasicBlock* block) const = 0;
+  virtual uintptr_t GetAddressOf(HBasicBlock* block) = 0;
   void InitializeCodeGeneration(size_t number_of_spill_slots,
                                 size_t maximum_number_of_live_core_registers,
                                 size_t maximum_number_of_live_fpu_registers,
@@ -298,8 +298,9 @@
   // save live registers, which may be needed by the runtime to set catch phis.
   bool IsImplicitNullCheckAllowed(HNullCheck* null_check) const;
 
+  // TODO: Avoid creating the `std::unique_ptr` here.
   void AddSlowPath(SlowPathCode* slow_path) {
-    slow_paths_.push_back(slow_path);
+    slow_paths_.push_back(std::unique_ptr<SlowPathCode>(slow_path));
   }
 
   void BuildStackMaps(MemoryRegion region, const DexFile::CodeItem& code_item);
@@ -617,7 +618,7 @@
   HGraph* const graph_;
   const CompilerOptions& compiler_options_;
 
-  ArenaVector<SlowPathCode*> slow_paths_;
+  ArenaVector<std::unique_ptr<SlowPathCode>> slow_paths_;
 
   // The current slow-path that we're generating code for.
   SlowPathCode* current_slow_path_;
diff --git a/compiler/optimizing/code_generator_arm.cc b/compiler/optimizing/code_generator_arm.cc
index 3049128..45d23fe 100644
--- a/compiler/optimizing/code_generator_arm.cc
+++ b/compiler/optimizing/code_generator_arm.cc
@@ -777,7 +777,7 @@
       location_builder_(graph, this),
       instruction_visitor_(graph, this),
       move_resolver_(graph->GetArena(), this),
-      assembler_(),
+      assembler_(graph->GetArena()),
       isa_features_(isa_features),
       uint32_literals_(std::less<uint32_t>(),
                        graph->GetArena()->Adapter(kArenaAllocCodeGenerator)),
diff --git a/compiler/optimizing/code_generator_arm.h b/compiler/optimizing/code_generator_arm.h
index 144d58d..0020f7b 100644
--- a/compiler/optimizing/code_generator_arm.h
+++ b/compiler/optimizing/code_generator_arm.h
@@ -339,7 +339,7 @@
     return assembler_;
   }
 
-  uintptr_t GetAddressOf(HBasicBlock* block) const OVERRIDE {
+  uintptr_t GetAddressOf(HBasicBlock* block) OVERRIDE {
     return GetLabelOf(block)->Position();
   }
 
diff --git a/compiler/optimizing/code_generator_arm64.cc b/compiler/optimizing/code_generator_arm64.cc
index c978aaa..e8e6b68 100644
--- a/compiler/optimizing/code_generator_arm64.cc
+++ b/compiler/optimizing/code_generator_arm64.cc
@@ -899,11 +899,12 @@
                     callee_saved_fp_registers.list(),
                     compiler_options,
                     stats),
-      block_labels_(nullptr),
+      block_labels_(graph->GetArena()->Adapter(kArenaAllocCodeGenerator)),
       jump_tables_(graph->GetArena()->Adapter(kArenaAllocCodeGenerator)),
       location_builder_(graph, this),
       instruction_visitor_(graph, this),
       move_resolver_(graph->GetArena(), this),
+      assembler_(graph->GetArena()),
       isa_features_(isa_features),
       uint32_literals_(std::less<uint32_t>(),
                        graph->GetArena()->Adapter(kArenaAllocCodeGenerator)),
@@ -927,7 +928,7 @@
 #define __ GetVIXLAssembler()->
 
 void CodeGeneratorARM64::EmitJumpTables() {
-  for (auto jump_table : jump_tables_) {
+  for (auto&& jump_table : jump_tables_) {
     jump_table->EmitTable(this);
   }
 }
@@ -4783,8 +4784,7 @@
       __ B(codegen_->GetLabelOf(default_block));
     }
   } else {
-    JumpTableARM64* jump_table = new (GetGraph()->GetArena()) JumpTableARM64(switch_instr);
-    codegen_->AddJumpTable(jump_table);
+    JumpTableARM64* jump_table = codegen_->CreateJumpTable(switch_instr);
 
     UseScratchRegisterScope temps(codegen_->GetVIXLAssembler());
 
diff --git a/compiler/optimizing/code_generator_arm64.h b/compiler/optimizing/code_generator_arm64.h
index ec46a34..422963e 100644
--- a/compiler/optimizing/code_generator_arm64.h
+++ b/compiler/optimizing/code_generator_arm64.h
@@ -83,7 +83,7 @@
   DISALLOW_COPY_AND_ASSIGN(SlowPathCodeARM64);
 };
 
-class JumpTableARM64 : public ArenaObject<kArenaAllocSwitchTable> {
+class JumpTableARM64 : public DeletableArenaObject<kArenaAllocSwitchTable> {
  public:
   explicit JumpTableARM64(HPackedSwitch* switch_instr)
     : switch_instr_(switch_instr), table_start_() {}
@@ -352,8 +352,9 @@
 
   void Bind(HBasicBlock* block) OVERRIDE;
 
-  vixl::Label* GetLabelOf(HBasicBlock* block) const {
-    return CommonGetLabelOf<vixl::Label>(block_labels_, block);
+  vixl::Label* GetLabelOf(HBasicBlock* block) {
+    block = FirstNonEmptyBlock(block);
+    return &(block_labels_[block->GetBlockId()]);
   }
 
   size_t GetWordSize() const OVERRIDE {
@@ -365,7 +366,7 @@
     return kArm64WordSize;
   }
 
-  uintptr_t GetAddressOf(HBasicBlock* block) const OVERRIDE {
+  uintptr_t GetAddressOf(HBasicBlock* block) OVERRIDE {
     vixl::Label* block_entry_label = GetLabelOf(block);
     DCHECK(block_entry_label->IsBound());
     return block_entry_label->location();
@@ -413,11 +414,12 @@
   }
 
   void Initialize() OVERRIDE {
-    block_labels_ = CommonInitializeLabels<vixl::Label>();
+    block_labels_.resize(GetGraph()->GetBlocks().size());
   }
 
-  void AddJumpTable(JumpTableARM64* jump_table) {
-    jump_tables_.push_back(jump_table);
+  JumpTableARM64* CreateJumpTable(HPackedSwitch* switch_instr) {
+    jump_tables_.emplace_back(new (GetGraph()->GetArena()) JumpTableARM64(switch_instr));
+    return jump_tables_.back().get();
   }
 
   void Finalize(CodeAllocator* allocator) OVERRIDE;
@@ -616,9 +618,10 @@
   void EmitJumpTables();
 
   // Labels for each block that will be compiled.
-  vixl::Label* block_labels_;  // Indexed by block id.
+  // We use a deque so that the `vixl::Label` objects do not move in memory.
+  ArenaDeque<vixl::Label> block_labels_;  // Indexed by block id.
   vixl::Label frame_entry_label_;
-  ArenaVector<JumpTableARM64*> jump_tables_;
+  ArenaVector<std::unique_ptr<JumpTableARM64>> jump_tables_;
 
   LocationsBuilderARM64 location_builder_;
   InstructionCodeGeneratorARM64 instruction_visitor_;
diff --git a/compiler/optimizing/code_generator_mips.cc b/compiler/optimizing/code_generator_mips.cc
index 185397c..12d1164 100644
--- a/compiler/optimizing/code_generator_mips.cc
+++ b/compiler/optimizing/code_generator_mips.cc
@@ -471,7 +471,7 @@
       location_builder_(graph, this),
       instruction_visitor_(graph, this),
       move_resolver_(graph->GetArena(), this),
-      assembler_(&isa_features),
+      assembler_(graph->GetArena(), &isa_features),
       isa_features_(isa_features) {
   // Save RA (containing the return address) to mimic Quick.
   AddAllocatedRegister(Location::RegisterLocation(RA));
diff --git a/compiler/optimizing/code_generator_mips.h b/compiler/optimizing/code_generator_mips.h
index 5e6fec8..435a869 100644
--- a/compiler/optimizing/code_generator_mips.h
+++ b/compiler/optimizing/code_generator_mips.h
@@ -275,7 +275,7 @@
 
   size_t GetFloatingPointSpillSlotSize() const OVERRIDE { return kMipsDoublewordSize; }
 
-  uintptr_t GetAddressOf(HBasicBlock* block) const OVERRIDE {
+  uintptr_t GetAddressOf(HBasicBlock* block) OVERRIDE {
     return assembler_.GetLabelLocation(GetLabelOf(block));
   }
 
diff --git a/compiler/optimizing/code_generator_mips64.cc b/compiler/optimizing/code_generator_mips64.cc
index 246f5b7..56ac38e 100644
--- a/compiler/optimizing/code_generator_mips64.cc
+++ b/compiler/optimizing/code_generator_mips64.cc
@@ -417,6 +417,7 @@
       location_builder_(graph, this),
       instruction_visitor_(graph, this),
       move_resolver_(graph->GetArena(), this),
+      assembler_(graph->GetArena()),
       isa_features_(isa_features) {
   // Save RA (containing the return address) to mimic Quick.
   AddAllocatedRegister(Location::RegisterLocation(RA));
diff --git a/compiler/optimizing/code_generator_mips64.h b/compiler/optimizing/code_generator_mips64.h
index 4e15cdd..9785a2e 100644
--- a/compiler/optimizing/code_generator_mips64.h
+++ b/compiler/optimizing/code_generator_mips64.h
@@ -271,7 +271,7 @@
 
   size_t GetFloatingPointSpillSlotSize() const OVERRIDE { return kMips64DoublewordSize; }
 
-  uintptr_t GetAddressOf(HBasicBlock* block) const OVERRIDE {
+  uintptr_t GetAddressOf(HBasicBlock* block) OVERRIDE {
     return assembler_.GetLabelLocation(GetLabelOf(block));
   }
 
diff --git a/compiler/optimizing/code_generator_x86.cc b/compiler/optimizing/code_generator_x86.cc
index 304cf08..1a4e62e 100644
--- a/compiler/optimizing/code_generator_x86.cc
+++ b/compiler/optimizing/code_generator_x86.cc
@@ -795,13 +795,16 @@
       location_builder_(graph, this),
       instruction_visitor_(graph, this),
       move_resolver_(graph->GetArena(), this),
+      assembler_(graph->GetArena()),
       isa_features_(isa_features),
       method_patches_(graph->GetArena()->Adapter(kArenaAllocCodeGenerator)),
       relative_call_patches_(graph->GetArena()->Adapter(kArenaAllocCodeGenerator)),
       pc_relative_dex_cache_patches_(graph->GetArena()->Adapter(kArenaAllocCodeGenerator)),
       simple_patches_(graph->GetArena()->Adapter(kArenaAllocCodeGenerator)),
       string_patches_(graph->GetArena()->Adapter(kArenaAllocCodeGenerator)),
-      fixups_to_jump_tables_(graph->GetArena()->Adapter(kArenaAllocCodeGenerator)) {
+      constant_area_start_(-1),
+      fixups_to_jump_tables_(graph->GetArena()->Adapter(kArenaAllocCodeGenerator)),
+      method_address_offset_(-1) {
   // Use a fake return address register to mimic Quick.
   AddAllocatedRegister(Location::RegisterLocation(kFakeReturnRegister));
 }
diff --git a/compiler/optimizing/code_generator_x86.h b/compiler/optimizing/code_generator_x86.h
index 69a6253..1739eec 100644
--- a/compiler/optimizing/code_generator_x86.h
+++ b/compiler/optimizing/code_generator_x86.h
@@ -361,7 +361,7 @@
     return assembler_;
   }
 
-  uintptr_t GetAddressOf(HBasicBlock* block) const OVERRIDE {
+  uintptr_t GetAddressOf(HBasicBlock* block) OVERRIDE {
     return GetLabelOf(block)->Position();
   }
 
diff --git a/compiler/optimizing/code_generator_x86_64.cc b/compiler/optimizing/code_generator_x86_64.cc
index 056b69b..59cc444 100644
--- a/compiler/optimizing/code_generator_x86_64.cc
+++ b/compiler/optimizing/code_generator_x86_64.cc
@@ -1007,6 +1007,7 @@
         location_builder_(graph, this),
         instruction_visitor_(graph, this),
         move_resolver_(graph->GetArena(), this),
+        assembler_(graph->GetArena()),
         isa_features_(isa_features),
         constant_area_start_(0),
         method_patches_(graph->GetArena()->Adapter(kArenaAllocCodeGenerator)),
diff --git a/compiler/optimizing/code_generator_x86_64.h b/compiler/optimizing/code_generator_x86_64.h
index d7ce7c6..3a211c5 100644
--- a/compiler/optimizing/code_generator_x86_64.h
+++ b/compiler/optimizing/code_generator_x86_64.h
@@ -346,7 +346,7 @@
     return &move_resolver_;
   }
 
-  uintptr_t GetAddressOf(HBasicBlock* block) const OVERRIDE {
+  uintptr_t GetAddressOf(HBasicBlock* block) OVERRIDE {
     return GetLabelOf(block)->Position();
   }
 
diff --git a/compiler/optimizing/optimizing_compiler.cc b/compiler/optimizing/optimizing_compiler.cc
index cad94c7..3670ce2 100644
--- a/compiler/optimizing/optimizing_compiler.cc
+++ b/compiler/optimizing/optimizing_compiler.cc
@@ -948,13 +948,11 @@
     info.frame_size_in_bytes = method_header->GetFrameSizeInBytes();
     info.code_info = stack_map_size == 0 ? nullptr : stack_map_data;
     info.cfi = ArrayRef<const uint8_t>(*codegen->GetAssembler()->cfi().data());
-    ArrayRef<const uint8_t> elf_file = debug::WriteDebugElfFileForMethods(
+    std::vector<uint8_t> elf_file = debug::WriteDebugElfFileForMethods(
         GetCompilerDriver()->GetInstructionSet(),
         GetCompilerDriver()->GetInstructionSetFeatures(),
         ArrayRef<const debug::MethodDebugInfo>(&info, 1));
-    CreateJITCodeEntryForAddress(code_address,
-                                 std::unique_ptr<const uint8_t[]>(elf_file.data()),
-                                 elf_file.size());
+    CreateJITCodeEntryForAddress(code_address, std::move(elf_file));
   }
 
   Runtime::Current()->GetJit()->AddMemoryUsage(method, arena.BytesUsed());
diff --git a/compiler/trampolines/trampoline_compiler.cc b/compiler/trampolines/trampoline_compiler.cc
index 48465e6..1ee1c4d 100644
--- a/compiler/trampolines/trampoline_compiler.cc
+++ b/compiler/trampolines/trampoline_compiler.cc
@@ -16,6 +16,7 @@
 
 #include "trampoline_compiler.h"
 
+#include "base/arena_allocator.h"
 #include "jni_env_ext.h"
 
 #ifdef ART_ENABLE_CODEGEN_arm
@@ -48,9 +49,9 @@
 
 #ifdef ART_ENABLE_CODEGEN_arm
 namespace arm {
-static const std::vector<uint8_t>* CreateTrampoline(EntryPointCallingConvention abi,
-                                                    ThreadOffset<4> offset) {
-  Thumb2Assembler assembler;
+static std::unique_ptr<const std::vector<uint8_t>> CreateTrampoline(
+    ArenaAllocator* arena, EntryPointCallingConvention abi, ThreadOffset<4> offset) {
+  Thumb2Assembler assembler(arena);
 
   switch (abi) {
     case kInterpreterAbi:  // Thread* is first argument (R0) in interpreter ABI.
@@ -68,19 +69,19 @@
   __ FinalizeCode();
   size_t cs = __ CodeSize();
   std::unique_ptr<std::vector<uint8_t>> entry_stub(new std::vector<uint8_t>(cs));
-  MemoryRegion code(&(*entry_stub)[0], entry_stub->size());
+  MemoryRegion code(entry_stub->data(), entry_stub->size());
   __ FinalizeInstructions(code);
 
-  return entry_stub.release();
+  return std::move(entry_stub);
 }
 }  // namespace arm
 #endif  // ART_ENABLE_CODEGEN_arm
 
 #ifdef ART_ENABLE_CODEGEN_arm64
 namespace arm64 {
-static const std::vector<uint8_t>* CreateTrampoline(EntryPointCallingConvention abi,
-                                                    ThreadOffset<8> offset) {
-  Arm64Assembler assembler;
+static std::unique_ptr<const std::vector<uint8_t>> CreateTrampoline(
+    ArenaAllocator* arena, EntryPointCallingConvention abi, ThreadOffset<8> offset) {
+  Arm64Assembler assembler(arena);
 
   switch (abi) {
     case kInterpreterAbi:  // Thread* is first argument (X0) in interpreter ABI.
@@ -107,19 +108,19 @@
   __ FinalizeCode();
   size_t cs = __ CodeSize();
   std::unique_ptr<std::vector<uint8_t>> entry_stub(new std::vector<uint8_t>(cs));
-  MemoryRegion code(&(*entry_stub)[0], entry_stub->size());
+  MemoryRegion code(entry_stub->data(), entry_stub->size());
   __ FinalizeInstructions(code);
 
-  return entry_stub.release();
+  return std::move(entry_stub);
 }
 }  // namespace arm64
 #endif  // ART_ENABLE_CODEGEN_arm64
 
 #ifdef ART_ENABLE_CODEGEN_mips
 namespace mips {
-static const std::vector<uint8_t>* CreateTrampoline(EntryPointCallingConvention abi,
-                                                    ThreadOffset<4> offset) {
-  MipsAssembler assembler;
+static std::unique_ptr<const std::vector<uint8_t>> CreateTrampoline(
+    ArenaAllocator* arena, EntryPointCallingConvention abi, ThreadOffset<4> offset) {
+  MipsAssembler assembler(arena);
 
   switch (abi) {
     case kInterpreterAbi:  // Thread* is first argument (A0) in interpreter ABI.
@@ -139,19 +140,19 @@
   __ FinalizeCode();
   size_t cs = __ CodeSize();
   std::unique_ptr<std::vector<uint8_t>> entry_stub(new std::vector<uint8_t>(cs));
-  MemoryRegion code(&(*entry_stub)[0], entry_stub->size());
+  MemoryRegion code(entry_stub->data(), entry_stub->size());
   __ FinalizeInstructions(code);
 
-  return entry_stub.release();
+  return std::move(entry_stub);
 }
 }  // namespace mips
 #endif  // ART_ENABLE_CODEGEN_mips
 
 #ifdef ART_ENABLE_CODEGEN_mips64
 namespace mips64 {
-static const std::vector<uint8_t>* CreateTrampoline(EntryPointCallingConvention abi,
-                                                    ThreadOffset<8> offset) {
-  Mips64Assembler assembler;
+static std::unique_ptr<const std::vector<uint8_t>> CreateTrampoline(
+    ArenaAllocator* arena, EntryPointCallingConvention abi, ThreadOffset<8> offset) {
+  Mips64Assembler assembler(arena);
 
   switch (abi) {
     case kInterpreterAbi:  // Thread* is first argument (A0) in interpreter ABI.
@@ -171,18 +172,19 @@
   __ FinalizeCode();
   size_t cs = __ CodeSize();
   std::unique_ptr<std::vector<uint8_t>> entry_stub(new std::vector<uint8_t>(cs));
-  MemoryRegion code(&(*entry_stub)[0], entry_stub->size());
+  MemoryRegion code(entry_stub->data(), entry_stub->size());
   __ FinalizeInstructions(code);
 
-  return entry_stub.release();
+  return std::move(entry_stub);
 }
 }  // namespace mips64
 #endif  // ART_ENABLE_CODEGEN_mips
 
 #ifdef ART_ENABLE_CODEGEN_x86
 namespace x86 {
-static const std::vector<uint8_t>* CreateTrampoline(ThreadOffset<4> offset) {
-  X86Assembler assembler;
+static std::unique_ptr<const std::vector<uint8_t>> CreateTrampoline(ArenaAllocator* arena,
+                                                                    ThreadOffset<4> offset) {
+  X86Assembler assembler(arena);
 
   // All x86 trampolines call via the Thread* held in fs.
   __ fs()->jmp(Address::Absolute(offset));
@@ -191,18 +193,19 @@
   __ FinalizeCode();
   size_t cs = __ CodeSize();
   std::unique_ptr<std::vector<uint8_t>> entry_stub(new std::vector<uint8_t>(cs));
-  MemoryRegion code(&(*entry_stub)[0], entry_stub->size());
+  MemoryRegion code(entry_stub->data(), entry_stub->size());
   __ FinalizeInstructions(code);
 
-  return entry_stub.release();
+  return std::move(entry_stub);
 }
 }  // namespace x86
 #endif  // ART_ENABLE_CODEGEN_x86
 
 #ifdef ART_ENABLE_CODEGEN_x86_64
 namespace x86_64 {
-static const std::vector<uint8_t>* CreateTrampoline(ThreadOffset<8> offset) {
-  x86_64::X86_64Assembler assembler;
+static std::unique_ptr<const std::vector<uint8_t>> CreateTrampoline(ArenaAllocator* arena,
+                                                                    ThreadOffset<8> offset) {
+  x86_64::X86_64Assembler assembler(arena);
 
   // All x86 trampolines call via the Thread* held in gs.
   __ gs()->jmp(x86_64::Address::Absolute(offset, true));
@@ -211,28 +214,31 @@
   __ FinalizeCode();
   size_t cs = __ CodeSize();
   std::unique_ptr<std::vector<uint8_t>> entry_stub(new std::vector<uint8_t>(cs));
-  MemoryRegion code(&(*entry_stub)[0], entry_stub->size());
+  MemoryRegion code(entry_stub->data(), entry_stub->size());
   __ FinalizeInstructions(code);
 
-  return entry_stub.release();
+  return std::move(entry_stub);
 }
 }  // namespace x86_64
 #endif  // ART_ENABLE_CODEGEN_x86_64
 
-const std::vector<uint8_t>* CreateTrampoline64(InstructionSet isa, EntryPointCallingConvention abi,
-                                               ThreadOffset<8> offset) {
+std::unique_ptr<const std::vector<uint8_t>> CreateTrampoline64(InstructionSet isa,
+                                                               EntryPointCallingConvention abi,
+                                                               ThreadOffset<8> offset) {
+  ArenaPool pool;
+  ArenaAllocator arena(&pool);
   switch (isa) {
 #ifdef ART_ENABLE_CODEGEN_arm64
     case kArm64:
-      return arm64::CreateTrampoline(abi, offset);
+      return arm64::CreateTrampoline(&arena, abi, offset);
 #endif
 #ifdef ART_ENABLE_CODEGEN_mips64
     case kMips64:
-      return mips64::CreateTrampoline(abi, offset);
+      return mips64::CreateTrampoline(&arena, abi, offset);
 #endif
 #ifdef ART_ENABLE_CODEGEN_x86_64
     case kX86_64:
-      return x86_64::CreateTrampoline(offset);
+      return x86_64::CreateTrampoline(&arena, offset);
 #endif
     default:
       UNUSED(abi);
@@ -242,22 +248,25 @@
   }
 }
 
-const std::vector<uint8_t>* CreateTrampoline32(InstructionSet isa, EntryPointCallingConvention abi,
-                                               ThreadOffset<4> offset) {
+std::unique_ptr<const std::vector<uint8_t>> CreateTrampoline32(InstructionSet isa,
+                                                               EntryPointCallingConvention abi,
+                                                               ThreadOffset<4> offset) {
+  ArenaPool pool;
+  ArenaAllocator arena(&pool);
   switch (isa) {
 #ifdef ART_ENABLE_CODEGEN_arm
     case kArm:
     case kThumb2:
-      return arm::CreateTrampoline(abi, offset);
+      return arm::CreateTrampoline(&arena, abi, offset);
 #endif
 #ifdef ART_ENABLE_CODEGEN_mips
     case kMips:
-      return mips::CreateTrampoline(abi, offset);
+      return mips::CreateTrampoline(&arena, abi, offset);
 #endif
 #ifdef ART_ENABLE_CODEGEN_x86
     case kX86:
       UNUSED(abi);
-      return x86::CreateTrampoline(offset);
+      return x86::CreateTrampoline(&arena, offset);
 #endif
     default:
       LOG(FATAL) << "Unexpected InstructionSet: " << isa;
diff --git a/compiler/trampolines/trampoline_compiler.h b/compiler/trampolines/trampoline_compiler.h
index 66d5ac3..8f823f1 100644
--- a/compiler/trampolines/trampoline_compiler.h
+++ b/compiler/trampolines/trampoline_compiler.h
@@ -25,12 +25,12 @@
 namespace art {
 
 // Create code that will invoke the function held in thread local storage.
-const std::vector<uint8_t>* CreateTrampoline32(InstructionSet isa,
-                                               EntryPointCallingConvention abi,
-                                               ThreadOffset<4> entry_point_offset);
-const std::vector<uint8_t>* CreateTrampoline64(InstructionSet isa,
-                                               EntryPointCallingConvention abi,
-                                               ThreadOffset<8> entry_point_offset);
+std::unique_ptr<const std::vector<uint8_t>> CreateTrampoline32(InstructionSet isa,
+                                                               EntryPointCallingConvention abi,
+                                                               ThreadOffset<4> entry_point_offset);
+std::unique_ptr<const std::vector<uint8_t>> CreateTrampoline64(InstructionSet isa,
+                                                               EntryPointCallingConvention abi,
+                                                               ThreadOffset<8> entry_point_offset);
 
 }  // namespace art
 
diff --git a/compiler/utils/arm/assembler_arm.cc b/compiler/utils/arm/assembler_arm.cc
index dead8fd..e5f91dc 100644
--- a/compiler/utils/arm/assembler_arm.cc
+++ b/compiler/utils/arm/assembler_arm.cc
@@ -845,7 +845,7 @@
 
 void ArmAssembler::ExceptionPoll(ManagedRegister mscratch, size_t stack_adjust) {
   ArmManagedRegister scratch = mscratch.AsArm();
-  ArmExceptionSlowPath* slow = new ArmExceptionSlowPath(scratch, stack_adjust);
+  ArmExceptionSlowPath* slow = new (GetArena()) ArmExceptionSlowPath(scratch, stack_adjust);
   buffer_.EnqueueSlowPath(slow);
   LoadFromOffset(kLoadWord, scratch.AsCoreRegister(),
                  TR, Thread::ExceptionOffset<4>().Int32Value());
diff --git a/compiler/utils/arm/assembler_arm.h b/compiler/utils/arm/assembler_arm.h
index a894565..ffbe786 100644
--- a/compiler/utils/arm/assembler_arm.h
+++ b/compiler/utils/arm/assembler_arm.h
@@ -20,6 +20,8 @@
 #include <type_traits>
 #include <vector>
 
+#include "base/arena_allocator.h"
+#include "base/arena_containers.h"
 #include "base/bit_utils.h"
 #include "base/logging.h"
 #include "base/stl_util.h"
@@ -1078,6 +1080,9 @@
   }
 
  protected:
+  explicit ArmAssembler(ArenaAllocator* arena)
+      : Assembler(arena), tracked_labels_(arena->Adapter(kArenaAllocAssembler)) {}
+
   // Returns whether or not the given register is used for passing parameters.
   static int RegisterCompare(const Register* reg1, const Register* reg2) {
     return *reg1 - *reg2;
@@ -1086,7 +1091,7 @@
   void FinalizeTrackedLabels();
 
   // Tracked labels. Use a vector, as we need to sort before adjusting.
-  std::vector<Label*> tracked_labels_;
+  ArenaVector<Label*> tracked_labels_;
 };
 
 // Slowpath entered when Thread::Current()->_exception is non-null
diff --git a/compiler/utils/arm/assembler_arm32.h b/compiler/utils/arm/assembler_arm32.h
index e3e05ca..bc6020e 100644
--- a/compiler/utils/arm/assembler_arm32.h
+++ b/compiler/utils/arm/assembler_arm32.h
@@ -30,8 +30,7 @@
 
 class Arm32Assembler FINAL : public ArmAssembler {
  public:
-  Arm32Assembler() {
-  }
+  explicit Arm32Assembler(ArenaAllocator* arena) : ArmAssembler(arena) {}
   virtual ~Arm32Assembler() {}
 
   bool IsThumb() const OVERRIDE {
diff --git a/compiler/utils/arm/assembler_thumb2.cc b/compiler/utils/arm/assembler_thumb2.cc
index 15298b3..26f7d0d 100644
--- a/compiler/utils/arm/assembler_thumb2.cc
+++ b/compiler/utils/arm/assembler_thumb2.cc
@@ -59,8 +59,8 @@
     return;
   }
   // Create and fill in the fixup_dependents_.
-  assembler->fixup_dependents_.reset(new FixupId[number_of_dependents]);
-  FixupId* dependents = assembler->fixup_dependents_.get();
+  assembler->fixup_dependents_.resize(number_of_dependents);
+  FixupId* dependents = assembler->fixup_dependents_.data();
   for (FixupId fixup_id = 0u; fixup_id != end_id; ++fixup_id) {
     uint32_t target = fixups[fixup_id].target_;
     if (target > fixups[fixup_id].location_) {
diff --git a/compiler/utils/arm/assembler_thumb2.h b/compiler/utils/arm/assembler_thumb2.h
index 6b61aca..111a6b0 100644
--- a/compiler/utils/arm/assembler_thumb2.h
+++ b/compiler/utils/arm/assembler_thumb2.h
@@ -21,6 +21,7 @@
 #include <utility>
 #include <vector>
 
+#include "base/arena_containers.h"
 #include "base/logging.h"
 #include "constants_arm.h"
 #include "utils/arm/managed_register_arm.h"
@@ -33,14 +34,16 @@
 
 class Thumb2Assembler FINAL : public ArmAssembler {
  public:
-  explicit Thumb2Assembler(bool can_relocate_branches = true)
-      : can_relocate_branches_(can_relocate_branches),
+  explicit Thumb2Assembler(ArenaAllocator* arena, bool can_relocate_branches = true)
+      : ArmAssembler(arena),
+        can_relocate_branches_(can_relocate_branches),
         force_32bit_(false),
         it_cond_index_(kNoItCondition),
         next_condition_(AL),
-        fixups_(),
-        fixup_dependents_(),
-        literals_(),
+        fixups_(arena->Adapter(kArenaAllocAssembler)),
+        fixup_dependents_(arena->Adapter(kArenaAllocAssembler)),
+        literals_(arena->Adapter(kArenaAllocAssembler)),
+        jump_tables_(arena->Adapter(kArenaAllocAssembler)),
         last_position_adjustment_(0u),
         last_old_position_(0u),
         last_fixup_id_(0u) {
@@ -558,9 +561,9 @@
     // Prepare the assembler->fixup_dependents_ and each Fixup's dependents_start_/count_.
     static void PrepareDependents(Thumb2Assembler* assembler);
 
-    ArrayRef<FixupId> Dependents(const Thumb2Assembler& assembler) const {
-      return ArrayRef<FixupId>(assembler.fixup_dependents_.get() + dependents_start_,
-                               dependents_count_);
+    ArrayRef<const FixupId> Dependents(const Thumb2Assembler& assembler) const {
+      return ArrayRef<const FixupId>(assembler.fixup_dependents_).SubArray(dependents_start_,
+                                                                           dependents_count_);
     }
 
     // Resolve a branch when the target is known.
@@ -839,15 +842,15 @@
   static int16_t AdrEncoding16(Register rd, int32_t offset);
   static int32_t AdrEncoding32(Register rd, int32_t offset);
 
-  std::vector<Fixup> fixups_;
-  std::unique_ptr<FixupId[]> fixup_dependents_;
+  ArenaVector<Fixup> fixups_;
+  ArenaVector<FixupId> fixup_dependents_;
 
   // Use std::deque<> for literal labels to allow insertions at the end
   // without invalidating pointers and references to existing elements.
-  std::deque<Literal> literals_;
+  ArenaDeque<Literal> literals_;
 
   // Jump table list.
-  std::deque<JumpTable> jump_tables_;
+  ArenaDeque<JumpTable> jump_tables_;
 
   // Data for AdjustedPosition(), see the description there.
   uint32_t last_position_adjustment_;
diff --git a/compiler/utils/arm64/assembler_arm64.cc b/compiler/utils/arm64/assembler_arm64.cc
index 0e17512..eb5112b 100644
--- a/compiler/utils/arm64/assembler_arm64.cc
+++ b/compiler/utils/arm64/assembler_arm64.cc
@@ -32,10 +32,8 @@
 #endif
 
 void Arm64Assembler::FinalizeCode() {
-  if (!exception_blocks_.empty()) {
-    for (size_t i = 0; i < exception_blocks_.size(); i++) {
-      EmitExceptionPoll(exception_blocks_.at(i));
-    }
+  for (const std::unique_ptr<Arm64Exception>& exception : exception_blocks_) {
+    EmitExceptionPoll(exception.get());
   }
   ___ FinalizeCode();
 }
@@ -613,10 +611,9 @@
 void Arm64Assembler::ExceptionPoll(ManagedRegister m_scratch, size_t stack_adjust) {
   CHECK_ALIGNED(stack_adjust, kStackAlignment);
   Arm64ManagedRegister scratch = m_scratch.AsArm64();
-  Arm64Exception *current_exception = new Arm64Exception(scratch, stack_adjust);
-  exception_blocks_.push_back(current_exception);
+  exception_blocks_.emplace_back(new Arm64Exception(scratch, stack_adjust));
   LoadFromOffset(scratch.AsXRegister(), TR, Thread::ExceptionOffset<8>().Int32Value());
-  ___ Cbnz(reg_x(scratch.AsXRegister()), current_exception->Entry());
+  ___ Cbnz(reg_x(scratch.AsXRegister()), exception_blocks_.back()->Entry());
 }
 
 void Arm64Assembler::EmitExceptionPoll(Arm64Exception *exception) {
diff --git a/compiler/utils/arm64/assembler_arm64.h b/compiler/utils/arm64/assembler_arm64.h
index 7b25b8f..c4e5de7 100644
--- a/compiler/utils/arm64/assembler_arm64.h
+++ b/compiler/utils/arm64/assembler_arm64.h
@@ -21,6 +21,7 @@
 #include <memory>
 #include <vector>
 
+#include "base/arena_containers.h"
 #include "base/logging.h"
 #include "constants_arm64.h"
 #include "utils/arm64/managed_register_arm64.h"
@@ -61,13 +62,34 @@
   kStoreDWord
 };
 
-class Arm64Exception;
+class Arm64Exception {
+ private:
+  Arm64Exception(Arm64ManagedRegister scratch, size_t stack_adjust)
+      : scratch_(scratch), stack_adjust_(stack_adjust) {
+    }
+
+  vixl::Label* Entry() { return &exception_entry_; }
+
+  // Register used for passing Thread::Current()->exception_ .
+  const Arm64ManagedRegister scratch_;
+
+  // Stack adjust for ExceptionPool.
+  const size_t stack_adjust_;
+
+  vixl::Label exception_entry_;
+
+  friend class Arm64Assembler;
+  DISALLOW_COPY_AND_ASSIGN(Arm64Exception);
+};
 
 class Arm64Assembler FINAL : public Assembler {
  public:
   // We indicate the size of the initial code generation buffer to the VIXL
   // assembler. From there we it will automatically manage the buffer.
-  Arm64Assembler() : vixl_masm_(new vixl::MacroAssembler(kArm64BaseBufferSize)) {}
+  explicit Arm64Assembler(ArenaAllocator* arena)
+      : Assembler(arena),
+        exception_blocks_(arena->Adapter(kArenaAllocAssembler)),
+        vixl_masm_(new vixl::MacroAssembler(kArm64BaseBufferSize)) {}
 
   virtual ~Arm64Assembler() {
     delete vixl_masm_;
@@ -249,7 +271,7 @@
   void AddConstant(XRegister rd, XRegister rn, int32_t value, vixl::Condition cond = vixl::al);
 
   // List of exception blocks to generate at the end of the code cache.
-  std::vector<Arm64Exception*> exception_blocks_;
+  ArenaVector<std::unique_ptr<Arm64Exception>> exception_blocks_;
 
  public:
   // Vixl assembler.
@@ -259,26 +281,6 @@
   friend class Arm64ManagedRegister_VixlRegisters_Test;
 };
 
-class Arm64Exception {
- private:
-  Arm64Exception(Arm64ManagedRegister scratch, size_t stack_adjust)
-      : scratch_(scratch), stack_adjust_(stack_adjust) {
-    }
-
-  vixl::Label* Entry() { return &exception_entry_; }
-
-  // Register used for passing Thread::Current()->exception_ .
-  const Arm64ManagedRegister scratch_;
-
-  // Stack adjust for ExceptionPool.
-  const size_t stack_adjust_;
-
-  vixl::Label exception_entry_;
-
-  friend class Arm64Assembler;
-  DISALLOW_COPY_AND_ASSIGN(Arm64Exception);
-};
-
 }  // namespace arm64
 }  // namespace art
 
diff --git a/compiler/utils/assembler.cc b/compiler/utils/assembler.cc
index f784d2c..c2aa574 100644
--- a/compiler/utils/assembler.cc
+++ b/compiler/utils/assembler.cc
@@ -44,14 +44,10 @@
 
 namespace art {
 
-static uint8_t* NewContents(size_t capacity) {
-  return new uint8_t[capacity];
-}
-
-
-AssemblerBuffer::AssemblerBuffer() {
+AssemblerBuffer::AssemblerBuffer(ArenaAllocator* arena)
+    : arena_(arena) {
   static const size_t kInitialBufferCapacity = 4 * KB;
-  contents_ = NewContents(kInitialBufferCapacity);
+  contents_ = arena_->AllocArray<uint8_t>(kInitialBufferCapacity);
   cursor_ = contents_;
   limit_ = ComputeLimit(contents_, kInitialBufferCapacity);
   fixup_ = nullptr;
@@ -68,7 +64,9 @@
 
 
 AssemblerBuffer::~AssemblerBuffer() {
-  delete[] contents_;
+  if (arena_->IsRunningOnMemoryTool()) {
+    arena_->MakeInaccessible(contents_, Capacity());
+  }
 }
 
 
@@ -100,19 +98,12 @@
   new_capacity = std::max(new_capacity, min_capacity);
 
   // Allocate the new data area and copy contents of the old one to it.
-  uint8_t* new_contents = NewContents(new_capacity);
-  memmove(reinterpret_cast<void*>(new_contents),
-          reinterpret_cast<void*>(contents_),
-          old_size);
-
-  // Compute the relocation delta and switch to the new contents area.
-  ptrdiff_t delta = new_contents - contents_;
-  delete[] contents_;
-  contents_ = new_contents;
+  contents_ = reinterpret_cast<uint8_t*>(
+      arena_->Realloc(contents_, old_capacity, new_capacity, kArenaAllocAssembler));
 
   // Update the cursor and recompute the limit.
-  cursor_ += delta;
-  limit_ = ComputeLimit(new_contents, new_capacity);
+  cursor_ = contents_ + old_size;
+  limit_ = ComputeLimit(contents_, new_capacity);
 
   // Verify internal state.
   CHECK_EQ(Capacity(), new_capacity);
@@ -129,36 +120,40 @@
   }
 }
 
-Assembler* Assembler::Create(InstructionSet instruction_set,
-                             const InstructionSetFeatures* instruction_set_features) {
+std::unique_ptr<Assembler> Assembler::Create(
+    ArenaAllocator* arena,
+    InstructionSet instruction_set,
+    const InstructionSetFeatures* instruction_set_features) {
   switch (instruction_set) {
 #ifdef ART_ENABLE_CODEGEN_arm
     case kArm:
-      return new arm::Arm32Assembler();
+      return std::unique_ptr<Assembler>(new (arena) arm::Arm32Assembler(arena));
     case kThumb2:
-      return new arm::Thumb2Assembler();
+      return std::unique_ptr<Assembler>(new (arena) arm::Thumb2Assembler(arena));
 #endif
 #ifdef ART_ENABLE_CODEGEN_arm64
     case kArm64:
-      return new arm64::Arm64Assembler();
+      return std::unique_ptr<Assembler>(new (arena) arm64::Arm64Assembler(arena));
 #endif
 #ifdef ART_ENABLE_CODEGEN_mips
     case kMips:
-      return new mips::MipsAssembler(instruction_set_features != nullptr
-                                         ? instruction_set_features->AsMipsInstructionSetFeatures()
-                                         : nullptr);
+      return std::unique_ptr<Assembler>(new (arena) mips::MipsAssembler(
+          arena,
+          instruction_set_features != nullptr
+              ? instruction_set_features->AsMipsInstructionSetFeatures()
+              : nullptr));
 #endif
 #ifdef ART_ENABLE_CODEGEN_mips64
     case kMips64:
-      return new mips64::Mips64Assembler();
+      return std::unique_ptr<Assembler>(new (arena) mips64::Mips64Assembler(arena));
 #endif
 #ifdef ART_ENABLE_CODEGEN_x86
     case kX86:
-      return new x86::X86Assembler();
+      return std::unique_ptr<Assembler>(new (arena) x86::X86Assembler(arena));
 #endif
 #ifdef ART_ENABLE_CODEGEN_x86_64
     case kX86_64:
-      return new x86_64::X86_64Assembler();
+      return std::unique_ptr<Assembler>(new (arena) x86_64::X86_64Assembler(arena));
 #endif
     default:
       LOG(FATAL) << "Unknown InstructionSet: " << instruction_set;
diff --git a/compiler/utils/assembler.h b/compiler/utils/assembler.h
index 414ea7e..4ea85a2 100644
--- a/compiler/utils/assembler.h
+++ b/compiler/utils/assembler.h
@@ -22,6 +22,8 @@
 #include "arch/instruction_set.h"
 #include "arch/instruction_set_features.h"
 #include "arm/constants_arm.h"
+#include "base/arena_allocator.h"
+#include "base/arena_object.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "debug/dwarf/debug_frame_opcode_writer.h"
@@ -60,7 +62,7 @@
 };
 
 // Parent of all queued slow paths, emitted during finalization
-class SlowPath {
+class SlowPath : public DeletableArenaObject<kArenaAllocAssembler> {
  public:
   SlowPath() : next_(nullptr) {}
   virtual ~SlowPath() {}
@@ -85,9 +87,13 @@
 
 class AssemblerBuffer {
  public:
-  AssemblerBuffer();
+  explicit AssemblerBuffer(ArenaAllocator* arena);
   ~AssemblerBuffer();
 
+  ArenaAllocator* GetArena() {
+    return arena_;
+  }
+
   // Basic support for emitting, loading, and storing.
   template<typename T> void Emit(T value) {
     CHECK(HasEnsuredCapacity());
@@ -235,6 +241,7 @@
   // for a single, fast space check per instruction.
   static const int kMinimumGap = 32;
 
+  ArenaAllocator* arena_;
   uint8_t* contents_;
   uint8_t* cursor_;
   uint8_t* limit_;
@@ -338,10 +345,12 @@
   std::vector<DelayedAdvancePC> delayed_advance_pcs_;
 };
 
-class Assembler {
+class Assembler : public DeletableArenaObject<kArenaAllocAssembler> {
  public:
-  static Assembler* Create(InstructionSet instruction_set,
-                           const InstructionSetFeatures* instruction_set_features = nullptr);
+  static std::unique_ptr<Assembler> Create(
+      ArenaAllocator* arena,
+      InstructionSet instruction_set,
+      const InstructionSetFeatures* instruction_set_features = nullptr);
 
   // Finalize the code; emit slow paths, fixup branches, add literal pool, etc.
   virtual void FinalizeCode() { buffer_.EmitSlowPaths(this); }
@@ -504,7 +513,11 @@
   DebugFrameOpCodeWriterForAssembler& cfi() { return cfi_; }
 
  protected:
-  Assembler() : buffer_(), cfi_(this) {}
+  explicit Assembler(ArenaAllocator* arena) : buffer_(arena), cfi_(this) {}
+
+  ArenaAllocator* GetArena() {
+    return buffer_.GetArena();
+  }
 
   AssemblerBuffer buffer_;
 
diff --git a/compiler/utils/assembler_test.h b/compiler/utils/assembler_test.h
index 2579ddb..084e901 100644
--- a/compiler/utils/assembler_test.h
+++ b/compiler/utils/assembler_test.h
@@ -460,7 +460,8 @@
   explicit AssemblerTest() {}
 
   void SetUp() OVERRIDE {
-    assembler_.reset(new Ass());
+    arena_.reset(new ArenaAllocator(&pool_));
+    assembler_.reset(new (arena_.get()) Ass(arena_.get()));
     test_helper_.reset(
         new AssemblerTestInfrastructure(GetArchitectureString(),
                                         GetAssemblerCmdName(),
@@ -476,6 +477,8 @@
 
   void TearDown() OVERRIDE {
     test_helper_.reset();  // Clean up the helper.
+    assembler_.reset();
+    arena_.reset();
   }
 
   // Override this to set up any architecture-specific things, e.g., register vectors.
@@ -919,6 +922,8 @@
 
   static constexpr size_t kWarnManyCombinationsThreshold = 500;
 
+  ArenaPool pool_;
+  std::unique_ptr<ArenaAllocator> arena_;
   std::unique_ptr<Ass> assembler_;
   std::unique_ptr<AssemblerTestInfrastructure> test_helper_;
 
diff --git a/compiler/utils/assembler_thumb_test.cc b/compiler/utils/assembler_thumb_test.cc
index 2df9b17..c67cb5a 100644
--- a/compiler/utils/assembler_thumb_test.cc
+++ b/compiler/utils/assembler_thumb_test.cc
@@ -195,11 +195,18 @@
 
 #undef __
 
+class Thumb2AssemblerTest : public ::testing::Test {
+ public:
+  Thumb2AssemblerTest() : pool(), arena(&pool), assembler(&arena) { }
+
+  ArenaPool pool;
+  ArenaAllocator arena;
+  arm::Thumb2Assembler assembler;
+};
+
 #define __ assembler.
 
-TEST(Thumb2AssemblerTest, SimpleMov) {
-  arm::Thumb2Assembler assembler;
-
+TEST_F(Thumb2AssemblerTest, SimpleMov) {
   __ movs(R0, ShifterOperand(R1));
   __ mov(R0, ShifterOperand(R1));
   __ mov(R8, ShifterOperand(R9));
@@ -210,8 +217,7 @@
   EmitAndCheck(&assembler, "SimpleMov");
 }
 
-TEST(Thumb2AssemblerTest, SimpleMov32) {
-  arm::Thumb2Assembler assembler;
+TEST_F(Thumb2AssemblerTest, SimpleMov32) {
   __ Force32Bit();
 
   __ mov(R0, ShifterOperand(R1));
@@ -220,9 +226,7 @@
   EmitAndCheck(&assembler, "SimpleMov32");
 }
 
-TEST(Thumb2AssemblerTest, SimpleMovAdd) {
-  arm::Thumb2Assembler assembler;
-
+TEST_F(Thumb2AssemblerTest, SimpleMovAdd) {
   __ mov(R0, ShifterOperand(R1));
   __ adds(R0, R1, ShifterOperand(R2));
   __ add(R0, R1, ShifterOperand(0));
@@ -230,9 +234,7 @@
   EmitAndCheck(&assembler, "SimpleMovAdd");
 }
 
-TEST(Thumb2AssemblerTest, DataProcessingRegister) {
-  arm::Thumb2Assembler assembler;
-
+TEST_F(Thumb2AssemblerTest, DataProcessingRegister) {
   // 32 bit variants using low registers.
   __ mvn(R0, ShifterOperand(R1), AL, kCcKeep);
   __ add(R0, R1, ShifterOperand(R2), AL, kCcKeep);
@@ -364,9 +366,7 @@
   EmitAndCheck(&assembler, "DataProcessingRegister");
 }
 
-TEST(Thumb2AssemblerTest, DataProcessingImmediate) {
-  arm::Thumb2Assembler assembler;
-
+TEST_F(Thumb2AssemblerTest, DataProcessingImmediate) {
   __ mov(R0, ShifterOperand(0x55));
   __ mvn(R0, ShifterOperand(0x55));
   __ add(R0, R1, ShifterOperand(0x55));
@@ -397,9 +397,7 @@
   EmitAndCheck(&assembler, "DataProcessingImmediate");
 }
 
-TEST(Thumb2AssemblerTest, DataProcessingModifiedImmediate) {
-  arm::Thumb2Assembler assembler;
-
+TEST_F(Thumb2AssemblerTest, DataProcessingModifiedImmediate) {
   __ mov(R0, ShifterOperand(0x550055));
   __ mvn(R0, ShifterOperand(0x550055));
   __ add(R0, R1, ShifterOperand(0x550055));
@@ -422,9 +420,7 @@
 }
 
 
-TEST(Thumb2AssemblerTest, DataProcessingModifiedImmediates) {
-  arm::Thumb2Assembler assembler;
-
+TEST_F(Thumb2AssemblerTest, DataProcessingModifiedImmediates) {
   __ mov(R0, ShifterOperand(0x550055));
   __ mov(R0, ShifterOperand(0x55005500));
   __ mov(R0, ShifterOperand(0x55555555));
@@ -436,9 +432,7 @@
   EmitAndCheck(&assembler, "DataProcessingModifiedImmediates");
 }
 
-TEST(Thumb2AssemblerTest, DataProcessingShiftedRegister) {
-  arm::Thumb2Assembler assembler;
-
+TEST_F(Thumb2AssemblerTest, DataProcessingShiftedRegister) {
   // 16-bit variants.
   __ movs(R3, ShifterOperand(R4, LSL, 4));
   __ movs(R3, ShifterOperand(R4, LSR, 5));
@@ -467,10 +461,9 @@
   EmitAndCheck(&assembler, "DataProcessingShiftedRegister");
 }
 
-TEST(Thumb2AssemblerTest, ShiftImmediate) {
+TEST_F(Thumb2AssemblerTest, ShiftImmediate) {
   // Note: This test produces the same results as DataProcessingShiftedRegister
   // but it does so using shift functions instead of mov().
-  arm::Thumb2Assembler assembler;
 
   // 16-bit variants.
   __ Lsl(R3, R4, 4);
@@ -500,9 +493,7 @@
   EmitAndCheck(&assembler, "ShiftImmediate");
 }
 
-TEST(Thumb2AssemblerTest, BasicLoad) {
-  arm::Thumb2Assembler assembler;
-
+TEST_F(Thumb2AssemblerTest, BasicLoad) {
   __ ldr(R3, Address(R4, 24));
   __ ldrb(R3, Address(R4, 24));
   __ ldrh(R3, Address(R4, 24));
@@ -522,9 +513,7 @@
 }
 
 
-TEST(Thumb2AssemblerTest, BasicStore) {
-  arm::Thumb2Assembler assembler;
-
+TEST_F(Thumb2AssemblerTest, BasicStore) {
   __ str(R3, Address(R4, 24));
   __ strb(R3, Address(R4, 24));
   __ strh(R3, Address(R4, 24));
@@ -539,9 +528,7 @@
   EmitAndCheck(&assembler, "BasicStore");
 }
 
-TEST(Thumb2AssemblerTest, ComplexLoad) {
-  arm::Thumb2Assembler assembler;
-
+TEST_F(Thumb2AssemblerTest, ComplexLoad) {
   __ ldr(R3, Address(R4, 24, Address::Mode::Offset));
   __ ldr(R3, Address(R4, 24, Address::Mode::PreIndex));
   __ ldr(R3, Address(R4, 24, Address::Mode::PostIndex));
@@ -581,9 +568,7 @@
 }
 
 
-TEST(Thumb2AssemblerTest, ComplexStore) {
-  arm::Thumb2Assembler assembler;
-
+TEST_F(Thumb2AssemblerTest, ComplexStore) {
   __ str(R3, Address(R4, 24, Address::Mode::Offset));
   __ str(R3, Address(R4, 24, Address::Mode::PreIndex));
   __ str(R3, Address(R4, 24, Address::Mode::PostIndex));
@@ -608,9 +593,7 @@
   EmitAndCheck(&assembler, "ComplexStore");
 }
 
-TEST(Thumb2AssemblerTest, NegativeLoadStore) {
-  arm::Thumb2Assembler assembler;
-
+TEST_F(Thumb2AssemblerTest, NegativeLoadStore) {
   __ ldr(R3, Address(R4, -24, Address::Mode::Offset));
   __ ldr(R3, Address(R4, -24, Address::Mode::PreIndex));
   __ ldr(R3, Address(R4, -24, Address::Mode::PostIndex));
@@ -670,18 +653,14 @@
   EmitAndCheck(&assembler, "NegativeLoadStore");
 }
 
-TEST(Thumb2AssemblerTest, SimpleLoadStoreDual) {
-  arm::Thumb2Assembler assembler;
-
+TEST_F(Thumb2AssemblerTest, SimpleLoadStoreDual) {
   __ strd(R2, Address(R0, 24, Address::Mode::Offset));
   __ ldrd(R2, Address(R0, 24, Address::Mode::Offset));
 
   EmitAndCheck(&assembler, "SimpleLoadStoreDual");
 }
 
-TEST(Thumb2AssemblerTest, ComplexLoadStoreDual) {
-  arm::Thumb2Assembler assembler;
-
+TEST_F(Thumb2AssemblerTest, ComplexLoadStoreDual) {
   __ strd(R2, Address(R0, 24, Address::Mode::Offset));
   __ strd(R2, Address(R0, 24, Address::Mode::PreIndex));
   __ strd(R2, Address(R0, 24, Address::Mode::PostIndex));
@@ -699,9 +678,7 @@
   EmitAndCheck(&assembler, "ComplexLoadStoreDual");
 }
 
-TEST(Thumb2AssemblerTest, NegativeLoadStoreDual) {
-  arm::Thumb2Assembler assembler;
-
+TEST_F(Thumb2AssemblerTest, NegativeLoadStoreDual) {
   __ strd(R2, Address(R0, -24, Address::Mode::Offset));
   __ strd(R2, Address(R0, -24, Address::Mode::PreIndex));
   __ strd(R2, Address(R0, -24, Address::Mode::PostIndex));
@@ -719,9 +696,7 @@
   EmitAndCheck(&assembler, "NegativeLoadStoreDual");
 }
 
-TEST(Thumb2AssemblerTest, SimpleBranch) {
-  arm::Thumb2Assembler assembler;
-
+TEST_F(Thumb2AssemblerTest, SimpleBranch) {
   Label l1;
   __ mov(R0, ShifterOperand(2));
   __ Bind(&l1);
@@ -757,8 +732,7 @@
   EmitAndCheck(&assembler, "SimpleBranch");
 }
 
-TEST(Thumb2AssemblerTest, LongBranch) {
-  arm::Thumb2Assembler assembler;
+TEST_F(Thumb2AssemblerTest, LongBranch) {
   __ Force32Bit();
   // 32 bit branches.
   Label l1;
@@ -797,9 +771,7 @@
   EmitAndCheck(&assembler, "LongBranch");
 }
 
-TEST(Thumb2AssemblerTest, LoadMultiple) {
-  arm::Thumb2Assembler assembler;
-
+TEST_F(Thumb2AssemblerTest, LoadMultiple) {
   // 16 bit.
   __ ldm(DB_W, R4, (1 << R0 | 1 << R3));
 
@@ -813,9 +785,7 @@
   EmitAndCheck(&assembler, "LoadMultiple");
 }
 
-TEST(Thumb2AssemblerTest, StoreMultiple) {
-  arm::Thumb2Assembler assembler;
-
+TEST_F(Thumb2AssemblerTest, StoreMultiple) {
   // 16 bit.
   __ stm(IA_W, R4, (1 << R0 | 1 << R3));
 
@@ -830,9 +800,7 @@
   EmitAndCheck(&assembler, "StoreMultiple");
 }
 
-TEST(Thumb2AssemblerTest, MovWMovT) {
-  arm::Thumb2Assembler assembler;
-
+TEST_F(Thumb2AssemblerTest, MovWMovT) {
   // Always 32 bit.
   __ movw(R4, 0);
   __ movw(R4, 0x34);
@@ -848,9 +816,7 @@
   EmitAndCheck(&assembler, "MovWMovT");
 }
 
-TEST(Thumb2AssemblerTest, SpecialAddSub) {
-  arm::Thumb2Assembler assembler;
-
+TEST_F(Thumb2AssemblerTest, SpecialAddSub) {
   __ add(R2, SP, ShifterOperand(0x50));   // 16 bit.
   __ add(SP, SP, ShifterOperand(0x50));   // 16 bit.
   __ add(R8, SP, ShifterOperand(0x50));   // 32 bit.
@@ -869,9 +835,7 @@
   EmitAndCheck(&assembler, "SpecialAddSub");
 }
 
-TEST(Thumb2AssemblerTest, LoadFromOffset) {
-  arm::Thumb2Assembler assembler;
-
+TEST_F(Thumb2AssemblerTest, LoadFromOffset) {
   __ LoadFromOffset(kLoadWord, R2, R4, 12);
   __ LoadFromOffset(kLoadWord, R2, R4, 0xfff);
   __ LoadFromOffset(kLoadWord, R2, R4, 0x1000);
@@ -901,9 +865,7 @@
   EmitAndCheck(&assembler, "LoadFromOffset");
 }
 
-TEST(Thumb2AssemblerTest, StoreToOffset) {
-  arm::Thumb2Assembler assembler;
-
+TEST_F(Thumb2AssemblerTest, StoreToOffset) {
   __ StoreToOffset(kStoreWord, R2, R4, 12);
   __ StoreToOffset(kStoreWord, R2, R4, 0xfff);
   __ StoreToOffset(kStoreWord, R2, R4, 0x1000);
@@ -931,9 +893,7 @@
   EmitAndCheck(&assembler, "StoreToOffset");
 }
 
-TEST(Thumb2AssemblerTest, IfThen) {
-  arm::Thumb2Assembler assembler;
-
+TEST_F(Thumb2AssemblerTest, IfThen) {
   __ it(EQ);
   __ mov(R1, ShifterOperand(1), EQ);
 
@@ -964,9 +924,7 @@
   EmitAndCheck(&assembler, "IfThen");
 }
 
-TEST(Thumb2AssemblerTest, CbzCbnz) {
-  arm::Thumb2Assembler assembler;
-
+TEST_F(Thumb2AssemblerTest, CbzCbnz) {
   Label l1;
   __ cbz(R2, &l1);
   __ mov(R1, ShifterOperand(3));
@@ -984,9 +942,7 @@
   EmitAndCheck(&assembler, "CbzCbnz");
 }
 
-TEST(Thumb2AssemblerTest, Multiply) {
-  arm::Thumb2Assembler assembler;
-
+TEST_F(Thumb2AssemblerTest, Multiply) {
   __ mul(R0, R1, R0);
   __ mul(R0, R1, R2);
   __ mul(R8, R9, R8);
@@ -1004,9 +960,7 @@
   EmitAndCheck(&assembler, "Multiply");
 }
 
-TEST(Thumb2AssemblerTest, Divide) {
-  arm::Thumb2Assembler assembler;
-
+TEST_F(Thumb2AssemblerTest, Divide) {
   __ sdiv(R0, R1, R2);
   __ sdiv(R8, R9, R10);
 
@@ -1016,9 +970,7 @@
   EmitAndCheck(&assembler, "Divide");
 }
 
-TEST(Thumb2AssemblerTest, VMov) {
-  arm::Thumb2Assembler assembler;
-
+TEST_F(Thumb2AssemblerTest, VMov) {
   __ vmovs(S1, 1.0);
   __ vmovd(D1, 1.0);
 
@@ -1029,9 +981,7 @@
 }
 
 
-TEST(Thumb2AssemblerTest, BasicFloatingPoint) {
-  arm::Thumb2Assembler assembler;
-
+TEST_F(Thumb2AssemblerTest, BasicFloatingPoint) {
   __ vadds(S0, S1, S2);
   __ vsubs(S0, S1, S2);
   __ vmuls(S0, S1, S2);
@@ -1055,9 +1005,7 @@
   EmitAndCheck(&assembler, "BasicFloatingPoint");
 }
 
-TEST(Thumb2AssemblerTest, FloatingPointConversions) {
-  arm::Thumb2Assembler assembler;
-
+TEST_F(Thumb2AssemblerTest, FloatingPointConversions) {
   __ vcvtsd(S2, D2);
   __ vcvtds(D2, S2);
 
@@ -1076,9 +1024,7 @@
   EmitAndCheck(&assembler, "FloatingPointConversions");
 }
 
-TEST(Thumb2AssemblerTest, FloatingPointComparisons) {
-  arm::Thumb2Assembler assembler;
-
+TEST_F(Thumb2AssemblerTest, FloatingPointComparisons) {
   __ vcmps(S0, S1);
   __ vcmpd(D0, D1);
 
@@ -1088,35 +1034,27 @@
   EmitAndCheck(&assembler, "FloatingPointComparisons");
 }
 
-TEST(Thumb2AssemblerTest, Calls) {
-  arm::Thumb2Assembler assembler;
-
+TEST_F(Thumb2AssemblerTest, Calls) {
   __ blx(LR);
   __ bx(LR);
 
   EmitAndCheck(&assembler, "Calls");
 }
 
-TEST(Thumb2AssemblerTest, Breakpoint) {
-  arm::Thumb2Assembler assembler;
-
+TEST_F(Thumb2AssemblerTest, Breakpoint) {
   __ bkpt(0);
 
   EmitAndCheck(&assembler, "Breakpoint");
 }
 
-TEST(Thumb2AssemblerTest, StrR1) {
-  arm::Thumb2Assembler assembler;
-
+TEST_F(Thumb2AssemblerTest, StrR1) {
   __ str(R1, Address(SP, 68));
   __ str(R1, Address(SP, 1068));
 
   EmitAndCheck(&assembler, "StrR1");
 }
 
-TEST(Thumb2AssemblerTest, VPushPop) {
-  arm::Thumb2Assembler assembler;
-
+TEST_F(Thumb2AssemblerTest, VPushPop) {
   __ vpushs(S2, 4);
   __ vpushd(D2, 4);
 
@@ -1126,9 +1064,7 @@
   EmitAndCheck(&assembler, "VPushPop");
 }
 
-TEST(Thumb2AssemblerTest, Max16BitBranch) {
-  arm::Thumb2Assembler assembler;
-
+TEST_F(Thumb2AssemblerTest, Max16BitBranch) {
   Label l1;
   __ b(&l1);
   for (int i = 0 ; i < (1 << 11) ; i += 2) {
@@ -1140,9 +1076,7 @@
   EmitAndCheck(&assembler, "Max16BitBranch");
 }
 
-TEST(Thumb2AssemblerTest, Branch32) {
-  arm::Thumb2Assembler assembler;
-
+TEST_F(Thumb2AssemblerTest, Branch32) {
   Label l1;
   __ b(&l1);
   for (int i = 0 ; i < (1 << 11) + 2 ; i += 2) {
@@ -1154,9 +1088,7 @@
   EmitAndCheck(&assembler, "Branch32");
 }
 
-TEST(Thumb2AssemblerTest, CompareAndBranchMax) {
-  arm::Thumb2Assembler assembler;
-
+TEST_F(Thumb2AssemblerTest, CompareAndBranchMax) {
   Label l1;
   __ cbz(R4, &l1);
   for (int i = 0 ; i < (1 << 7) ; i += 2) {
@@ -1168,9 +1100,7 @@
   EmitAndCheck(&assembler, "CompareAndBranchMax");
 }
 
-TEST(Thumb2AssemblerTest, CompareAndBranchRelocation16) {
-  arm::Thumb2Assembler assembler;
-
+TEST_F(Thumb2AssemblerTest, CompareAndBranchRelocation16) {
   Label l1;
   __ cbz(R4, &l1);
   for (int i = 0 ; i < (1 << 7) + 2 ; i += 2) {
@@ -1182,9 +1112,7 @@
   EmitAndCheck(&assembler, "CompareAndBranchRelocation16");
 }
 
-TEST(Thumb2AssemblerTest, CompareAndBranchRelocation32) {
-  arm::Thumb2Assembler assembler;
-
+TEST_F(Thumb2AssemblerTest, CompareAndBranchRelocation32) {
   Label l1;
   __ cbz(R4, &l1);
   for (int i = 0 ; i < (1 << 11) + 2 ; i += 2) {
@@ -1196,9 +1124,7 @@
   EmitAndCheck(&assembler, "CompareAndBranchRelocation32");
 }
 
-TEST(Thumb2AssemblerTest, MixedBranch32) {
-  arm::Thumb2Assembler assembler;
-
+TEST_F(Thumb2AssemblerTest, MixedBranch32) {
   Label l1;
   Label l2;
   __ b(&l1);      // Forwards.
@@ -1215,9 +1141,7 @@
   EmitAndCheck(&assembler, "MixedBranch32");
 }
 
-TEST(Thumb2AssemblerTest, Shifts) {
-  arm::Thumb2Assembler assembler;
-
+TEST_F(Thumb2AssemblerTest, Shifts) {
   // 16 bit selected for CcDontCare.
   __ Lsl(R0, R1, 5);
   __ Lsr(R0, R1, 5);
@@ -1292,9 +1216,7 @@
   EmitAndCheck(&assembler, "Shifts");
 }
 
-TEST(Thumb2AssemblerTest, LoadStoreRegOffset) {
-  arm::Thumb2Assembler assembler;
-
+TEST_F(Thumb2AssemblerTest, LoadStoreRegOffset) {
   // 16 bit.
   __ ldr(R0, Address(R1, R2));
   __ str(R0, Address(R1, R2));
@@ -1319,9 +1241,7 @@
   EmitAndCheck(&assembler, "LoadStoreRegOffset");
 }
 
-TEST(Thumb2AssemblerTest, LoadStoreLiteral) {
-  arm::Thumb2Assembler assembler;
-
+TEST_F(Thumb2AssemblerTest, LoadStoreLiteral) {
   __ ldr(R0, Address(4));
   __ str(R0, Address(4));
 
@@ -1337,9 +1257,7 @@
   EmitAndCheck(&assembler, "LoadStoreLiteral");
 }
 
-TEST(Thumb2AssemblerTest, LoadStoreLimits) {
-  arm::Thumb2Assembler assembler;
-
+TEST_F(Thumb2AssemblerTest, LoadStoreLimits) {
   __ ldr(R0, Address(R4, 124));     // 16 bit.
   __ ldr(R0, Address(R4, 128));     // 32 bit.
 
@@ -1367,9 +1285,7 @@
   EmitAndCheck(&assembler, "LoadStoreLimits");
 }
 
-TEST(Thumb2AssemblerTest, CompareAndBranch) {
-  arm::Thumb2Assembler assembler;
-
+TEST_F(Thumb2AssemblerTest, CompareAndBranch) {
   Label label;
   __ CompareAndBranchIfZero(arm::R0, &label);
   __ CompareAndBranchIfZero(arm::R11, &label);
@@ -1380,9 +1296,7 @@
   EmitAndCheck(&assembler, "CompareAndBranch");
 }
 
-TEST(Thumb2AssemblerTest, AddConstant) {
-  arm::Thumb2Assembler assembler;
-
+TEST_F(Thumb2AssemblerTest, AddConstant) {
   // Low registers, Rd != Rn.
   __ AddConstant(R0, R1, 0);                          // MOV.
   __ AddConstant(R0, R1, 1);                          // 16-bit ADDS, encoding T1.
@@ -1626,9 +1540,7 @@
   EmitAndCheck(&assembler, "AddConstant");
 }
 
-TEST(Thumb2AssemblerTest, CmpConstant) {
-  arm::Thumb2Assembler assembler;
-
+TEST_F(Thumb2AssemblerTest, CmpConstant) {
   __ CmpConstant(R0, 0);                              // 16-bit CMP.
   __ CmpConstant(R1, 1);                              // 16-bit CMP.
   __ CmpConstant(R0, 7);                              // 16-bit CMP.
diff --git a/compiler/utils/mips/assembler_mips.h b/compiler/utils/mips/assembler_mips.h
index ffac4c4..ecb67bd 100644
--- a/compiler/utils/mips/assembler_mips.h
+++ b/compiler/utils/mips/assembler_mips.h
@@ -102,8 +102,10 @@
 
 class MipsAssembler FINAL : public Assembler {
  public:
-  explicit MipsAssembler(const MipsInstructionSetFeatures* instruction_set_features = nullptr)
-      : overwriting_(false),
+  explicit MipsAssembler(ArenaAllocator* arena,
+                         const MipsInstructionSetFeatures* instruction_set_features = nullptr)
+      : Assembler(arena),
+        overwriting_(false),
         overwrite_location_(0),
         last_position_adjustment_(0),
         last_old_position_(0),
diff --git a/compiler/utils/mips64/assembler_mips64.h b/compiler/utils/mips64/assembler_mips64.h
index 71f5e00..8acc38a 100644
--- a/compiler/utils/mips64/assembler_mips64.h
+++ b/compiler/utils/mips64/assembler_mips64.h
@@ -102,8 +102,9 @@
 
 class Mips64Assembler FINAL : public Assembler {
  public:
-  Mips64Assembler()
-      : overwriting_(false),
+  explicit Mips64Assembler(ArenaAllocator* arena)
+      : Assembler(arena),
+        overwriting_(false),
         overwrite_location_(0),
         last_position_adjustment_(0),
         last_old_position_(0),
diff --git a/compiler/utils/x86/assembler_x86.cc b/compiler/utils/x86/assembler_x86.cc
index 3efef70..2203646 100644
--- a/compiler/utils/x86/assembler_x86.cc
+++ b/compiler/utils/x86/assembler_x86.cc
@@ -2379,7 +2379,7 @@
 }
 
 void X86Assembler::ExceptionPoll(ManagedRegister /*scratch*/, size_t stack_adjust) {
-  X86ExceptionSlowPath* slow = new X86ExceptionSlowPath(stack_adjust);
+  X86ExceptionSlowPath* slow = new (GetArena()) X86ExceptionSlowPath(stack_adjust);
   buffer_.EnqueueSlowPath(slow);
   fs()->cmpl(Address::Absolute(Thread::ExceptionOffset<4>()), Immediate(0));
   j(kNotEqual, slow->Entry());
@@ -2402,7 +2402,7 @@
 }
 
 void X86Assembler::AddConstantArea() {
-  const std::vector<int32_t>& area = constant_area_.GetBuffer();
+  ArrayRef<const int32_t> area = constant_area_.GetBuffer();
   // Generate the data for the literal area.
   for (size_t i = 0, e = area.size(); i < e; i++) {
     AssemblerBuffer::EnsureCapacity ensured(&buffer_);
diff --git a/compiler/utils/x86/assembler_x86.h b/compiler/utils/x86/assembler_x86.h
index 00ff7bd..8567ad2 100644
--- a/compiler/utils/x86/assembler_x86.h
+++ b/compiler/utils/x86/assembler_x86.h
@@ -18,12 +18,15 @@
 #define ART_COMPILER_UTILS_X86_ASSEMBLER_X86_H_
 
 #include <vector>
+
+#include "base/arena_containers.h"
 #include "base/bit_utils.h"
 #include "base/macros.h"
 #include "constants_x86.h"
 #include "globals.h"
 #include "managed_register_x86.h"
 #include "offsets.h"
+#include "utils/array_ref.h"
 #include "utils/assembler.h"
 
 namespace art {
@@ -260,7 +263,7 @@
  */
 class ConstantArea {
  public:
-  ConstantArea() {}
+  explicit ConstantArea(ArenaAllocator* arena) : buffer_(arena->Adapter(kArenaAllocAssembler)) {}
 
   // Add a double to the constant area, returning the offset into
   // the constant area where the literal resides.
@@ -290,18 +293,18 @@
     return buffer_.size() * elem_size_;
   }
 
-  const std::vector<int32_t>& GetBuffer() const {
-    return buffer_;
+  ArrayRef<const int32_t> GetBuffer() const {
+    return ArrayRef<const int32_t>(buffer_);
   }
 
  private:
   static constexpr size_t elem_size_ = sizeof(int32_t);
-  std::vector<int32_t> buffer_;
+  ArenaVector<int32_t> buffer_;
 };
 
 class X86Assembler FINAL : public Assembler {
  public:
-  X86Assembler() {}
+  explicit X86Assembler(ArenaAllocator* arena) : Assembler(arena), constant_area_(arena) {}
   virtual ~X86Assembler() {}
 
   /*
diff --git a/compiler/utils/x86/assembler_x86_test.cc b/compiler/utils/x86/assembler_x86_test.cc
index d0d5147..1d1df6e 100644
--- a/compiler/utils/x86/assembler_x86_test.cc
+++ b/compiler/utils/x86/assembler_x86_test.cc
@@ -16,13 +16,16 @@
 
 #include "assembler_x86.h"
 
+#include "base/arena_allocator.h"
 #include "base/stl_util.h"
 #include "utils/assembler_test.h"
 
 namespace art {
 
 TEST(AssemblerX86, CreateBuffer) {
-  AssemblerBuffer buffer;
+  ArenaPool pool;
+  ArenaAllocator arena(&pool);
+  AssemblerBuffer buffer(&arena);
   AssemblerBuffer::EnsureCapacity ensured(&buffer);
   buffer.Emit<uint8_t>(0x42);
   ASSERT_EQ(static_cast<size_t>(1), buffer.Size());
diff --git a/compiler/utils/x86_64/assembler_x86_64.cc b/compiler/utils/x86_64/assembler_x86_64.cc
index d86ad1b..32eb4a3 100644
--- a/compiler/utils/x86_64/assembler_x86_64.cc
+++ b/compiler/utils/x86_64/assembler_x86_64.cc
@@ -3144,7 +3144,7 @@
 };
 
 void X86_64Assembler::ExceptionPoll(ManagedRegister /*scratch*/, size_t stack_adjust) {
-  X86_64ExceptionSlowPath* slow = new X86_64ExceptionSlowPath(stack_adjust);
+  X86_64ExceptionSlowPath* slow = new (GetArena()) X86_64ExceptionSlowPath(stack_adjust);
   buffer_.EnqueueSlowPath(slow);
   gs()->cmpl(Address::Absolute(Thread::ExceptionOffset<8>(), true), Immediate(0));
   j(kNotEqual, slow->Entry());
@@ -3167,7 +3167,7 @@
 }
 
 void X86_64Assembler::AddConstantArea() {
-  const std::vector<int32_t>& area = constant_area_.GetBuffer();
+  ArrayRef<const int32_t> area = constant_area_.GetBuffer();
   for (size_t i = 0, e = area.size(); i < e; i++) {
     AssemblerBuffer::EnsureCapacity ensured(&buffer_);
     EmitInt32(area[i]);
diff --git a/compiler/utils/x86_64/assembler_x86_64.h b/compiler/utils/x86_64/assembler_x86_64.h
index f00cb12..92c7d0a 100644
--- a/compiler/utils/x86_64/assembler_x86_64.h
+++ b/compiler/utils/x86_64/assembler_x86_64.h
@@ -19,12 +19,14 @@
 
 #include <vector>
 
+#include "base/arena_containers.h"
 #include "base/bit_utils.h"
 #include "base/macros.h"
 #include "constants_x86_64.h"
 #include "globals.h"
 #include "managed_register_x86_64.h"
 #include "offsets.h"
+#include "utils/array_ref.h"
 #include "utils/assembler.h"
 
 namespace art {
@@ -270,7 +272,7 @@
  */
 class ConstantArea {
  public:
-  ConstantArea() {}
+  explicit ConstantArea(ArenaAllocator* arena) : buffer_(arena->Adapter(kArenaAllocAssembler)) {}
 
   // Add a double to the constant area, returning the offset into
   // the constant area where the literal resides.
@@ -296,13 +298,13 @@
     return buffer_.size() * elem_size_;
   }
 
-  const std::vector<int32_t>& GetBuffer() const {
-    return buffer_;
+  ArrayRef<const int32_t> GetBuffer() const {
+    return ArrayRef<const int32_t>(buffer_);
   }
 
  private:
   static constexpr size_t elem_size_ = sizeof(int32_t);
-  std::vector<int32_t> buffer_;
+  ArenaVector<int32_t> buffer_;
 };
 
 
@@ -332,7 +334,7 @@
 
 class X86_64Assembler FINAL : public Assembler {
  public:
-  X86_64Assembler() {}
+  explicit X86_64Assembler(ArenaAllocator* arena) : Assembler(arena), constant_area_(arena) {}
   virtual ~X86_64Assembler() {}
 
   /*
diff --git a/compiler/utils/x86_64/assembler_x86_64_test.cc b/compiler/utils/x86_64/assembler_x86_64_test.cc
index 4f65709..b19e616 100644
--- a/compiler/utils/x86_64/assembler_x86_64_test.cc
+++ b/compiler/utils/x86_64/assembler_x86_64_test.cc
@@ -27,7 +27,9 @@
 namespace art {
 
 TEST(AssemblerX86_64, CreateBuffer) {
-  AssemblerBuffer buffer;
+  ArenaPool pool;
+  ArenaAllocator arena(&pool);
+  AssemblerBuffer buffer(&arena);
   AssemblerBuffer::EnsureCapacity ensured(&buffer);
   buffer.Emit<uint8_t>(0x42);
   ASSERT_EQ(static_cast<size_t>(1), buffer.Size());
diff --git a/runtime/base/arena_allocator.cc b/runtime/base/arena_allocator.cc
index 70ff60f..d951089 100644
--- a/runtime/base/arena_allocator.cc
+++ b/runtime/base/arena_allocator.cc
@@ -77,9 +77,11 @@
   "RegAllocVldt ",
   "StackMapStm  ",
   "CodeGen      ",
+  "Assembler    ",
   "ParallelMove ",
   "GraphChecker ",
   "Verifier     ",
+  "CallingConv  ",
 };
 
 template <bool kCount>
diff --git a/runtime/base/arena_allocator.h b/runtime/base/arena_allocator.h
index 697f7e0..52a1002 100644
--- a/runtime/base/arena_allocator.h
+++ b/runtime/base/arena_allocator.h
@@ -88,9 +88,11 @@
   kArenaAllocRegisterAllocatorValidate,
   kArenaAllocStackMapStream,
   kArenaAllocCodeGenerator,
+  kArenaAllocAssembler,
   kArenaAllocParallelMoveResolver,
   kArenaAllocGraphChecker,
   kArenaAllocVerifier,
+  kArenaAllocCallingConvention,
   kNumArenaAllocKinds
 };
 
diff --git a/runtime/interpreter/interpreter.cc b/runtime/interpreter/interpreter.cc
index a432782..97dbe5d 100644
--- a/runtime/interpreter/interpreter.cc
+++ b/runtime/interpreter/interpreter.cc
@@ -292,7 +292,7 @@
 
         // Pop the shadow frame before calling into compiled code.
         self->PopShadowFrame();
-        ArtInterpreterToCompiledCodeBridge(self, code_item, &shadow_frame, &result);
+        ArtInterpreterToCompiledCodeBridge(self, nullptr, code_item, &shadow_frame, &result);
         // Push the shadow frame back as the caller will expect it.
         self->PushShadowFrame(&shadow_frame);
 
@@ -535,6 +535,10 @@
     return JValue();
   }
 
+  jit::Jit* jit = Runtime::Current()->GetJit();
+  if (jit != nullptr) {
+    jit->NotifyCompiledCodeToInterpreterTransition(self, shadow_frame->GetMethod());
+  }
   return Execute(self, code_item, *shadow_frame, JValue());
 }
 
diff --git a/runtime/interpreter/interpreter_common.cc b/runtime/interpreter/interpreter_common.cc
index 3453abc..12d70c5 100644
--- a/runtime/interpreter/interpreter_common.cc
+++ b/runtime/interpreter/interpreter_common.cc
@@ -503,6 +503,7 @@
                                 uint32_t vregC) ALWAYS_INLINE;
 
 void ArtInterpreterToCompiledCodeBridge(Thread* self,
+                                        ArtMethod* caller,
                                         const DexFile::CodeItem* code_item,
                                         ShadowFrame* shadow_frame,
                                         JValue* result)
@@ -530,6 +531,10 @@
   uint16_t arg_offset = (code_item == nullptr)
                             ? 0
                             : code_item->registers_size_ - code_item->ins_size_;
+  jit::Jit* jit = Runtime::Current()->GetJit();
+  if (jit != nullptr && caller != nullptr) {
+    jit->NotifyInterpreterToCompiledCodeTransition(self, caller);
+  }
   method->Invoke(self, shadow_frame->GetVRegArgs(arg_offset),
                  (shadow_frame->NumberOfVRegs() - arg_offset) * sizeof(uint32_t),
                  result, method->GetInterfaceMethodIfProxy(sizeof(void*))->GetShorty());
@@ -726,7 +731,8 @@
         target->GetEntryPointFromQuickCompiledCode())) {
       ArtInterpreterToInterpreterBridge(self, code_item, new_shadow_frame, result);
     } else {
-      ArtInterpreterToCompiledCodeBridge(self, code_item, new_shadow_frame, result);
+      ArtInterpreterToCompiledCodeBridge(
+          self, shadow_frame.GetMethod(), code_item, new_shadow_frame, result);
     }
   } else {
     UnstartedRuntime::Invoke(self, code_item, new_shadow_frame, result, first_dest_reg);
diff --git a/runtime/interpreter/interpreter_common.h b/runtime/interpreter/interpreter_common.h
index fb98175..e5b89e2 100644
--- a/runtime/interpreter/interpreter_common.h
+++ b/runtime/interpreter/interpreter_common.h
@@ -635,7 +635,7 @@
         jit->InvokeVirtualOrInterface(
             self, receiver, sf_method, shadow_frame.GetDexPC(), called_method);
       }
-      jit->AddSamples(self, sf_method, 1);
+      jit->AddSamples(self, sf_method, 1, /*with_backedges*/false);
     }
     // TODO: Remove the InvokeVirtualOrInterface instrumentation, as it was only used by the JIT.
     if (type == kVirtual || type == kInterface) {
@@ -681,7 +681,7 @@
     if (jit != nullptr) {
       jit->InvokeVirtualOrInterface(
           self, receiver, shadow_frame.GetMethod(), shadow_frame.GetDexPC(), called_method);
-      jit->AddSamples(self, shadow_frame.GetMethod(), 1);
+      jit->AddSamples(self, shadow_frame.GetMethod(), 1, /*with_backedges*/false);
     }
     instrumentation::Instrumentation* instrumentation = Runtime::Current()->GetInstrumentation();
     // TODO: Remove the InvokeVirtualOrInterface instrumentation, as it was only used by the JIT.
@@ -1001,8 +1001,11 @@
   return branch_offset <= 0;
 }
 
-void ArtInterpreterToCompiledCodeBridge(Thread* self, const DexFile::CodeItem* code_item,
-                                        ShadowFrame* shadow_frame, JValue* result);
+void ArtInterpreterToCompiledCodeBridge(Thread* self,
+                                        ArtMethod* caller,
+                                        const DexFile::CodeItem* code_item,
+                                        ShadowFrame* shadow_frame,
+                                        JValue* result);
 
 // Explicitly instantiate all DoInvoke functions.
 #define EXPLICIT_DO_INVOKE_TEMPLATE_DECL(_type, _is_range, _do_check)                      \
diff --git a/runtime/interpreter/interpreter_goto_table_impl.cc b/runtime/interpreter/interpreter_goto_table_impl.cc
index c95af6f..13cfb98 100644
--- a/runtime/interpreter/interpreter_goto_table_impl.cc
+++ b/runtime/interpreter/interpreter_goto_table_impl.cc
@@ -78,7 +78,7 @@
 #define HOTNESS_UPDATE()                                                                       \
   do {                                                                                         \
     if (jit != nullptr) {                                                                      \
-      jit->AddSamples(self, method, 1);                                                        \
+      jit->AddSamples(self, method, 1, /*with_backedges*/ true);                               \
     }                                                                                          \
   } while (false)
 
diff --git a/runtime/interpreter/interpreter_switch_impl.cc b/runtime/interpreter/interpreter_switch_impl.cc
index ca1d635..4323d4f 100644
--- a/runtime/interpreter/interpreter_switch_impl.cc
+++ b/runtime/interpreter/interpreter_switch_impl.cc
@@ -89,7 +89,7 @@
 #define HOTNESS_UPDATE()                                                                       \
   do {                                                                                         \
     if (jit != nullptr) {                                                                      \
-      jit->AddSamples(self, method, 1);                                                        \
+      jit->AddSamples(self, method, 1, /*with_backedges*/ true);                               \
     }                                                                                          \
   } while (false)
 
diff --git a/runtime/interpreter/mterp/mterp.cc b/runtime/interpreter/mterp/mterp.cc
index e005589..bd1af04 100644
--- a/runtime/interpreter/mterp/mterp.cc
+++ b/runtime/interpreter/mterp/mterp.cc
@@ -689,7 +689,7 @@
   jit::Jit* jit = Runtime::Current()->GetJit();
   if (jit != nullptr) {
     int16_t count = shadow_frame->GetCachedHotnessCountdown() - shadow_frame->GetHotnessCountdown();
-    jit->AddSamples(self, method, count);
+    jit->AddSamples(self, method, count, /*with_backedges*/ true);
   }
   return MterpSetUpHotnessCountdown(method, shadow_frame);
 }
@@ -702,7 +702,7 @@
   uint32_t dex_pc = shadow_frame->GetDexPC();
   jit::Jit* jit = Runtime::Current()->GetJit();
   if ((jit != nullptr) && (offset <= 0)) {
-    jit->AddSamples(self, method, 1);
+    jit->AddSamples(self, method, 1, /*with_backedges*/ true);
   }
   int16_t countdown_value = MterpSetUpHotnessCountdown(method, shadow_frame);
   if (countdown_value == jit::kJitCheckForOSR) {
@@ -722,7 +722,7 @@
   jit::Jit* jit = Runtime::Current()->GetJit();
   if (offset <= 0) {
     // Keep updating hotness in case a compilation request was dropped.  Eventually it will retry.
-    jit->AddSamples(self, method, 1);
+    jit->AddSamples(self, method, 1, /*with_backedges*/ true);
   }
   // Assumes caller has already determined that an OSR check is appropriate.
   return jit::Jit::MaybeDoOnStackReplacement(self, method, dex_pc, offset, result);
diff --git a/runtime/jit/debugger_interface.cc b/runtime/jit/debugger_interface.cc
index d9d7a19..7cdd7c5 100644
--- a/runtime/jit/debugger_interface.cc
+++ b/runtime/jit/debugger_interface.cc
@@ -70,15 +70,19 @@
 
 static Mutex g_jit_debug_mutex("JIT debug interface lock", kJitDebugInterfaceLock);
 
-static JITCodeEntry* CreateJITCodeEntryInternal(
-    std::unique_ptr<const uint8_t[]> symfile_addr,
-    uintptr_t symfile_size)
+static JITCodeEntry* CreateJITCodeEntryInternal(std::vector<uint8_t> symfile)
     REQUIRES(g_jit_debug_mutex) {
-  DCHECK(symfile_addr.get() != nullptr);
+  DCHECK_NE(symfile.size(), 0u);
+
+  // Make a copy of the buffer. We want to shrink it anyway.
+  uint8_t* symfile_copy = new uint8_t[symfile.size()];
+  CHECK(symfile_copy != nullptr);
+  memcpy(symfile_copy, symfile.data(), symfile.size());
 
   JITCodeEntry* entry = new JITCodeEntry;
-  entry->symfile_addr_ = symfile_addr.release();
-  entry->symfile_size_ = symfile_size;
+  CHECK(entry != nullptr);
+  entry->symfile_addr_ = symfile_copy;
+  entry->symfile_size_ = symfile.size();
   entry->prev_ = nullptr;
 
   entry->next_ = __jit_debug_descriptor.first_entry_;
@@ -111,11 +115,10 @@
   delete entry;
 }
 
-JITCodeEntry* CreateJITCodeEntry(std::unique_ptr<const uint8_t[]> symfile_addr,
-                                 uintptr_t symfile_size) {
+JITCodeEntry* CreateJITCodeEntry(std::vector<uint8_t> symfile) {
   Thread* self = Thread::Current();
   MutexLock mu(self, g_jit_debug_mutex);
-  return CreateJITCodeEntryInternal(std::move(symfile_addr), symfile_size);
+  return CreateJITCodeEntryInternal(std::move(symfile));
 }
 
 void DeleteJITCodeEntry(JITCodeEntry* entry) {
@@ -128,14 +131,12 @@
 // so that the user of the JIT interface does not have to store them.
 static std::unordered_map<uintptr_t, JITCodeEntry*> g_jit_code_entries;
 
-void CreateJITCodeEntryForAddress(uintptr_t address,
-                                  std::unique_ptr<const uint8_t[]> symfile_addr,
-                                  uintptr_t symfile_size) {
+void CreateJITCodeEntryForAddress(uintptr_t address, std::vector<uint8_t> symfile) {
   Thread* self = Thread::Current();
   MutexLock mu(self, g_jit_debug_mutex);
   DCHECK_NE(address, 0u);
   DCHECK(g_jit_code_entries.find(address) == g_jit_code_entries.end());
-  JITCodeEntry* entry = CreateJITCodeEntryInternal(std::move(symfile_addr), symfile_size);
+  JITCodeEntry* entry = CreateJITCodeEntryInternal(std::move(symfile));
   g_jit_code_entries.emplace(address, entry);
 }
 
diff --git a/runtime/jit/debugger_interface.h b/runtime/jit/debugger_interface.h
index 74469a9..d9bf331 100644
--- a/runtime/jit/debugger_interface.h
+++ b/runtime/jit/debugger_interface.h
@@ -19,6 +19,7 @@
 
 #include <inttypes.h>
 #include <memory>
+#include <vector>
 
 namespace art {
 
@@ -28,8 +29,7 @@
 
 // Notify native debugger about new JITed code by passing in-memory ELF.
 // It takes ownership of the in-memory ELF file.
-JITCodeEntry* CreateJITCodeEntry(std::unique_ptr<const uint8_t[]> symfile_addr,
-                                 uintptr_t symfile_size);
+JITCodeEntry* CreateJITCodeEntry(std::vector<uint8_t> symfile);
 
 // Notify native debugger that JITed code has been removed.
 // It also releases the associated in-memory ELF file.
@@ -38,9 +38,7 @@
 // Notify native debugger about new JITed code by passing in-memory ELF.
 // The address is used only to uniquely identify the entry.
 // It takes ownership of the in-memory ELF file.
-void CreateJITCodeEntryForAddress(uintptr_t address,
-                                  std::unique_ptr<const uint8_t[]> symfile_addr,
-                                  uintptr_t symfile_size);
+void CreateJITCodeEntryForAddress(uintptr_t address, std::vector<uint8_t> symfile);
 
 // Notify native debugger that JITed code has been removed.
 // Returns false if entry for the given address was not found.
diff --git a/runtime/jit/jit.cc b/runtime/jit/jit.cc
index 8f126bf..85371bc 100644
--- a/runtime/jit/jit.cc
+++ b/runtime/jit/jit.cc
@@ -97,18 +97,17 @@
       LOG(FATAL) << "Priority thread weight cannot be 0.";
     }
   } else {
-    jit_options->priority_thread_weight_ =
-        std::max(jit_options->compile_threshold_ / 2000, static_cast<size_t>(1));
+    jit_options->priority_thread_weight_ = std::max(
+        jit_options->warmup_threshold_ / Jit::kDefaultPriorityThreadWeightRatio,
+        static_cast<size_t>(1));
   }
 
   return jit_options;
 }
 
 bool Jit::ShouldUsePriorityThreadWeight() {
-  // TODO(calin): verify that IsSensitiveThread covers only the cases we are interested on.
-  // In particular if apps can set StrictMode policies for any of their threads, case in which
-  // we need to find another way to track sensitive threads.
-  return Runtime::Current()->InJankPerceptibleProcessState() && Thread::IsSensitiveThread();
+  return Runtime::Current()->InJankPerceptibleProcessState()
+      && Thread::Current()->IsJitSensitiveThread();
 }
 
 void Jit::DumpInfo(std::ostream& os) {
@@ -159,6 +158,8 @@
   jit->warm_method_threshold_ = options->GetWarmupThreshold();
   jit->osr_method_threshold_ = options->GetOsrThreshold();
   jit->priority_thread_weight_ = options->GetPriorityThreadWeight();
+  jit->transition_weight_ = std::max(
+      jit->warm_method_threshold_ / kDefaultTransitionRatio, static_cast<size_t>(1));
 
   jit->CreateThreadPool();
 
@@ -245,8 +246,17 @@
   if (!code_cache_->NotifyCompilationOf(method_to_compile, self, osr)) {
     return false;
   }
+
+  VLOG(jit) << "Compiling method "
+            << PrettyMethod(method_to_compile)
+            << " osr=" << std::boolalpha << osr;
   bool success = jit_compile_method_(jit_compiler_handle_, method_to_compile, self, osr);
   code_cache_->DoneCompiling(method_to_compile, self, osr);
+  if (!success) {
+    VLOG(jit) << "Failed to compile method "
+              << PrettyMethod(method_to_compile)
+              << " osr=" << std::boolalpha << osr;
+  }
   return success;
 }
 
@@ -525,15 +535,9 @@
   void Run(Thread* self) OVERRIDE {
     ScopedObjectAccess soa(self);
     if (kind_ == kCompile) {
-      VLOG(jit) << "JitCompileTask compiling method " << PrettyMethod(method_);
-      if (!Runtime::Current()->GetJit()->CompileMethod(method_, self, /* osr */ false)) {
-        VLOG(jit) << "Failed to compile method " << PrettyMethod(method_);
-      }
+      Runtime::Current()->GetJit()->CompileMethod(method_, self, /* osr */ false);
     } else if (kind_ == kCompileOsr) {
-      VLOG(jit) << "JitCompileTask compiling method osr " << PrettyMethod(method_);
-      if (!Runtime::Current()->GetJit()->CompileMethod(method_, self, /* osr */ true)) {
-        VLOG(jit) << "Failed to compile method osr " << PrettyMethod(method_);
-      }
+      Runtime::Current()->GetJit()->CompileMethod(method_, self, /* osr */ true);
     } else {
       DCHECK(kind_ == kAllocateProfile);
       if (ProfilingInfo::Create(self, method_, /* retry_allocation */ true)) {
@@ -554,7 +558,7 @@
   DISALLOW_IMPLICIT_CONSTRUCTORS(JitCompileTask);
 };
 
-void Jit::AddSamples(Thread* self, ArtMethod* method, uint16_t count) {
+void Jit::AddSamples(Thread* self, ArtMethod* method, uint16_t count, bool with_backedges) {
   if (thread_pool_ == nullptr) {
     // Should only see this when shutting down.
     DCHECK(Runtime::Current()->IsShuttingDown(self));
@@ -578,7 +582,8 @@
   }
   int32_t new_count = starting_count + count;   // int32 here to avoid wrap-around;
   if (starting_count < warm_method_threshold_) {
-    if (new_count >= warm_method_threshold_) {
+    if ((new_count >= warm_method_threshold_) &&
+        (method->GetProfilingInfo(sizeof(void*)) == nullptr)) {
       bool success = ProfilingInfo::Create(self, method, /* retry_allocation */ false);
       if (success) {
         VLOG(jit) << "Start profiling " << PrettyMethod(method);
@@ -600,14 +605,19 @@
     // Avoid jumping more than one state at a time.
     new_count = std::min(new_count, hot_method_threshold_ - 1);
   } else if (starting_count < hot_method_threshold_) {
-    if (new_count >= hot_method_threshold_) {
+    if ((new_count >= hot_method_threshold_) &&
+        !code_cache_->ContainsPc(method->GetEntryPointFromQuickCompiledCode())) {
       DCHECK(thread_pool_ != nullptr);
       thread_pool_->AddTask(self, new JitCompileTask(method, JitCompileTask::kCompile));
     }
     // Avoid jumping more than one state at a time.
     new_count = std::min(new_count, osr_method_threshold_ - 1);
   } else if (starting_count < osr_method_threshold_) {
-    if (new_count >= osr_method_threshold_) {
+    if (!with_backedges) {
+      // If the samples don't contain any back edge, we don't increment the hotness.
+      return;
+    }
+    if ((new_count >= osr_method_threshold_) &&  !code_cache_->IsOsrCompiled(method)) {
       DCHECK(thread_pool_ != nullptr);
       thread_pool_->AddTask(self, new JitCompileTask(method, JitCompileTask::kCompileOsr));
     }
@@ -635,7 +645,7 @@
       !Runtime::Current()->GetInstrumentation()->AreExitStubsInstalled()) {
     method->SetEntryPointFromQuickCompiledCode(profiling_info->GetSavedEntryPoint());
   } else {
-    AddSamples(thread, method, 1);
+    AddSamples(thread, method, 1, /* with_backedges */false);
   }
 }
 
diff --git a/runtime/jit/jit.h b/runtime/jit/jit.h
index 4e2d1ab..8198c18 100644
--- a/runtime/jit/jit.h
+++ b/runtime/jit/jit.h
@@ -43,6 +43,8 @@
  public:
   static constexpr bool kStressMode = kIsDebugBuild;
   static constexpr size_t kDefaultCompileThreshold = kStressMode ? 2 : 10000;
+  static constexpr size_t kDefaultPriorityThreadWeightRatio = 1000;
+  static constexpr size_t kDefaultTransitionRatio = 100;
 
   virtual ~Jit();
   static Jit* Create(JitOptions* options, std::string* error_msg);
@@ -92,7 +94,7 @@
   void MethodEntered(Thread* thread, ArtMethod* method)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
-  void AddSamples(Thread* self, ArtMethod* method, uint16_t samples)
+  void AddSamples(Thread* self, ArtMethod* method, uint16_t samples, bool with_backedges)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
   void InvokeVirtualOrInterface(Thread* thread,
@@ -102,6 +104,16 @@
                                 ArtMethod* callee)
       SHARED_REQUIRES(Locks::mutator_lock_);
 
+  void NotifyInterpreterToCompiledCodeTransition(Thread* self, ArtMethod* caller)
+      SHARED_REQUIRES(Locks::mutator_lock_) {
+    AddSamples(self, caller, transition_weight_, false);
+  }
+
+  void NotifyCompiledCodeToInterpreterTransition(Thread* self, ArtMethod* callee)
+      SHARED_REQUIRES(Locks::mutator_lock_) {
+    AddSamples(self, callee, transition_weight_, false);
+  }
+
   // Starts the profile saver if the config options allow profile recording.
   // The profile will be stored in the specified `filename` and will contain
   // information collected from the given `code_paths` (a set of dex locations).
@@ -173,6 +185,7 @@
   uint16_t warm_method_threshold_;
   uint16_t osr_method_threshold_;
   uint16_t priority_thread_weight_;
+  uint16_t transition_weight_;
   std::unique_ptr<ThreadPool> thread_pool_;
 
   DISALLOW_COPY_AND_ASSIGN(Jit);
diff --git a/runtime/jit/jit_code_cache.cc b/runtime/jit/jit_code_cache.cc
index 820ae6a..1f3e08b 100644
--- a/runtime/jit/jit_code_cache.cc
+++ b/runtime/jit/jit_code_cache.cc
@@ -366,7 +366,7 @@
     }
     last_update_time_ns_.StoreRelease(NanoTime());
     VLOG(jit)
-        << "JIT added (osr = " << std::boolalpha << osr << std::noboolalpha << ") "
+        << "JIT added (osr=" << std::boolalpha << osr << std::noboolalpha << ") "
         << PrettyMethod(method) << "@" << method
         << " ccache_size=" << PrettySize(CodeCacheSizeLocked()) << ": "
         << " dcache_size=" << PrettySize(DataCacheSizeLocked()) << ": "
@@ -905,15 +905,18 @@
   return last_update_time_ns_.LoadAcquire();
 }
 
+bool JitCodeCache::IsOsrCompiled(ArtMethod* method) {
+  MutexLock mu(Thread::Current(), lock_);
+  return osr_code_map_.find(method) != osr_code_map_.end();
+}
+
 bool JitCodeCache::NotifyCompilationOf(ArtMethod* method, Thread* self, bool osr) {
   if (!osr && ContainsPc(method->GetEntryPointFromQuickCompiledCode())) {
-    VLOG(jit) << PrettyMethod(method) << " is already compiled";
     return false;
   }
 
   MutexLock mu(self, lock_);
   if (osr && (osr_code_map_.find(method) != osr_code_map_.end())) {
-    VLOG(jit) << PrettyMethod(method) << " is already osr compiled";
     return false;
   }
 
@@ -928,7 +931,6 @@
   }
 
   if (info->IsMethodBeingCompiled(osr)) {
-    VLOG(jit) << PrettyMethod(method) << " is already being compiled";
     return false;
   }
 
diff --git a/runtime/jit/jit_code_cache.h b/runtime/jit/jit_code_cache.h
index 9f18c70..f31cc51 100644
--- a/runtime/jit/jit_code_cache.h
+++ b/runtime/jit/jit_code_cache.h
@@ -186,6 +186,8 @@
 
   void Dump(std::ostream& os) REQUIRES(!lock_);
 
+  bool IsOsrCompiled(ArtMethod* method) REQUIRES(!lock_);
+
  private:
   // Take ownership of maps.
   JitCodeCache(MemMap* code_map,
diff --git a/runtime/mirror/string-inl.h b/runtime/mirror/string-inl.h
index cdf468c..6285542 100644
--- a/runtime/mirror/string-inl.h
+++ b/runtime/mirror/string-inl.h
@@ -33,8 +33,8 @@
 namespace mirror {
 
 inline uint32_t String::ClassSize(size_t pointer_size) {
-  uint32_t vtable_entries = Object::kVTableLength + 53;
-  return Class::ComputeClassSize(true, vtable_entries, 0, 2, 0, 1, 2, pointer_size);
+  uint32_t vtable_entries = Object::kVTableLength + 56;
+  return Class::ComputeClassSize(true, vtable_entries, 0, 0, 0, 1, 2, pointer_size);
 }
 
 // Sets string count in the allocation code path to ensure it is guarded by a CAS.
diff --git a/runtime/native/dalvik_system_VMRuntime.cc b/runtime/native/dalvik_system_VMRuntime.cc
index 88a5870..56c0d58 100644
--- a/runtime/native/dalvik_system_VMRuntime.cc
+++ b/runtime/native/dalvik_system_VMRuntime.cc
@@ -216,6 +216,10 @@
   Runtime::Current()->GetHeap()->RegisterNativeAllocation(env, static_cast<size_t>(bytes));
 }
 
+static void VMRuntime_registerSensitiveThread(JNIEnv*, jobject) {
+  Runtime::Current()->RegisterSensitiveThread();
+}
+
 static void VMRuntime_registerNativeFree(JNIEnv* env, jobject, jint bytes) {
   if (UNLIKELY(bytes < 0)) {
     ScopedObjectAccess soa(env);
@@ -648,6 +652,7 @@
   NATIVE_METHOD(VMRuntime, properties, "()[Ljava/lang/String;"),
   NATIVE_METHOD(VMRuntime, setTargetSdkVersionNative, "(I)V"),
   NATIVE_METHOD(VMRuntime, registerNativeAllocation, "(I)V"),
+  NATIVE_METHOD(VMRuntime, registerSensitiveThread, "()V"),
   NATIVE_METHOD(VMRuntime, registerNativeFree, "(I)V"),
   NATIVE_METHOD(VMRuntime, requestConcurrentGC, "()V"),
   NATIVE_METHOD(VMRuntime, requestHeapTrim, "()V"),
diff --git a/runtime/openjdkjvm/OpenjdkJvm.cc b/runtime/openjdkjvm/OpenjdkJvm.cc
index aff9b61..1f33651 100644
--- a/runtime/openjdkjvm/OpenjdkJvm.cc
+++ b/runtime/openjdkjvm/OpenjdkJvm.cc
@@ -116,7 +116,18 @@
 
 /* posix lseek() */
 JNIEXPORT jlong JVM_Lseek(jint fd, jlong offset, jint whence) {
-    return TEMP_FAILURE_RETRY(lseek(fd, offset, whence));
+#if !defined(__APPLE__)
+    // NOTE: Using TEMP_FAILURE_RETRY here is busted for LP32 on glibc - the return
+    // value will be coerced into an int32_t.
+    //
+    // lseek64 isn't specified to return EINTR so it shouldn't be necessary
+    // anyway.
+    return lseek64(fd, offset, whence);
+#else
+    // NOTE: This code is compiled for Mac OS but isn't ever run on that
+    // platform.
+    return lseek(fd, offset, whence);
+#endif
 }
 
 /*
diff --git a/runtime/runtime.cc b/runtime/runtime.cc
index 2489e45..5dbc6b3 100644
--- a/runtime/runtime.cc
+++ b/runtime/runtime.cc
@@ -1981,4 +1981,8 @@
   GetHeap()->UpdateProcessState(old_process_state, process_state);
 }
 
+void Runtime::RegisterSensitiveThread() const {
+  Thread::SetJitSensitiveThread();
+}
+
 }  // namespace art
diff --git a/runtime/runtime.h b/runtime/runtime.h
index ae25dd1..c507129 100644
--- a/runtime/runtime.h
+++ b/runtime/runtime.h
@@ -635,6 +635,8 @@
     return process_state_ == kProcessStateJankPerceptible;
   }
 
+  void RegisterSensitiveThread() const;
+
   void SetZygoteNoThreadSection(bool val) {
     zygote_no_threads_ = val;
   }
diff --git a/runtime/thread.cc b/runtime/thread.cc
index e015833..a462036 100644
--- a/runtime/thread.cc
+++ b/runtime/thread.cc
@@ -89,6 +89,7 @@
 ConditionVariable* Thread::resume_cond_ = nullptr;
 const size_t Thread::kStackOverflowImplicitCheckSize = GetStackOverflowReservedBytes(kRuntimeISA);
 bool (*Thread::is_sensitive_thread_hook_)() = nullptr;
+Thread* Thread::jit_sensitive_thread_ = nullptr;
 
 static constexpr bool kVerifyImageObjectsMarked = kIsDebugBuild;
 
diff --git a/runtime/thread.h b/runtime/thread.h
index 2218b5a..b7b0591 100644
--- a/runtime/thread.h
+++ b/runtime/thread.h
@@ -1097,6 +1097,12 @@
     return debug_disallow_read_barrier_;
   }
 
+  // Returns true if the current thread is the jit sensitive thread.
+  bool IsJitSensitiveThread() const {
+    return this == jit_sensitive_thread_;
+  }
+
+  // Returns true if StrictMode events are traced for the current thread.
   static bool IsSensitiveThread() {
     if (is_sensitive_thread_hook_ != nullptr) {
       return (*is_sensitive_thread_hook_)();
@@ -1179,6 +1185,16 @@
   ALWAYS_INLINE void PassActiveSuspendBarriers()
       REQUIRES(!Locks::thread_suspend_count_lock_, !Roles::uninterruptible_);
 
+  // Registers the current thread as the jit sensitive thread. Should be called just once.
+  static void SetJitSensitiveThread() {
+    if (jit_sensitive_thread_ == nullptr) {
+      jit_sensitive_thread_ = Thread::Current();
+    } else {
+      LOG(WARNING) << "Attempt to set the sensitive thread twice. Tid:"
+          << Thread::Current()->GetTid();
+    }
+  }
+
   static void SetSensitiveThreadHook(bool (*is_sensitive_thread_hook)()) {
     is_sensitive_thread_hook_ = is_sensitive_thread_hook;
   }
@@ -1228,6 +1244,8 @@
   // Hook passed by framework which returns true
   // when StrictMode events are traced for the current thread.
   static bool (*is_sensitive_thread_hook_)();
+  // Stores the jit sensitive thread (which for now is the UI thread).
+  static Thread* jit_sensitive_thread_;
 
   /***********************************************************************************************/
   // Thread local storage. Fields are grouped by size to enable 32 <-> 64 searching to account for
diff --git a/runtime/verifier/method_verifier.cc b/runtime/verifier/method_verifier.cc
index d5319fd..647578e 100644
--- a/runtime/verifier/method_verifier.cc
+++ b/runtime/verifier/method_verifier.cc
@@ -4577,8 +4577,18 @@
       // Trying to access C1.field1 using reference of type C2, which is neither C1 or a sub-class
       // of C1. For resolution to occur the declared class of the field must be compatible with
       // obj_type, we've discovered this wasn't so, so report the field didn't exist.
-      Fail(VERIFY_ERROR_NO_FIELD) << "cannot access instance field " << PrettyField(field)
-                                  << " from object of type " << obj_type;
+      VerifyError type;
+      bool is_aot = Runtime::Current()->IsAotCompiler();
+      if (is_aot && (field_klass.IsUnresolvedTypes() || obj_type.IsUnresolvedTypes())) {
+        // Compiler & unresolved types involved, retry at runtime.
+        type = VerifyError::VERIFY_ERROR_NO_CLASS;
+      } else {
+        // Classes known (resolved; and thus assignability check is precise), or we are at runtime
+        // and still missing classes. This is a hard failure.
+        type = VerifyError::VERIFY_ERROR_BAD_CLASS_HARD;
+      }
+      Fail(type) << "cannot access instance field " << PrettyField(field)
+                 << " from object of type " << obj_type;
       return nullptr;
     } else {
       return field;
diff --git a/test/100-reflect2/expected.txt b/test/100-reflect2/expected.txt
index e4988c9..d878e69 100644
--- a/test/100-reflect2/expected.txt
+++ b/test/100-reflect2/expected.txt
@@ -32,8 +32,8 @@
 62 (class java.lang.Long)
 14 (class java.lang.Short)
 [java.lang.String(int,int,char[]), public java.lang.String(), public java.lang.String(byte[]), public java.lang.String(byte[],int), public java.lang.String(byte[],int,int), public java.lang.String(byte[],int,int,int), public java.lang.String(byte[],int,int,java.lang.String) throws java.io.UnsupportedEncodingException, public java.lang.String(byte[],int,int,java.nio.charset.Charset), public java.lang.String(byte[],java.lang.String) throws java.io.UnsupportedEncodingException, public java.lang.String(byte[],java.nio.charset.Charset), public java.lang.String(char[]), public java.lang.String(char[],int,int), public java.lang.String(int[],int,int), public java.lang.String(java.lang.String), public java.lang.String(java.lang.StringBuffer), public java.lang.String(java.lang.StringBuilder)]
-[private final int java.lang.String.count, private int java.lang.String.hash, private static final java.io.ObjectStreamField[] java.lang.String.serialPersistentFields, private static final long java.lang.String.serialVersionUID, private static int java.lang.String.HASHING_SEED, public static final java.util.Comparator java.lang.String.CASE_INSENSITIVE_ORDER]
-[int java.lang.String.hash32(), native void java.lang.String.getCharsNoCheck(int,int,char[],int), native void java.lang.String.setCharAt(int,char), private int java.lang.String.indexOfSupplementary(int,int), private int java.lang.String.lastIndexOfSupplementary(int,int), private native int java.lang.String.fastIndexOf(int,int), private native java.lang.String java.lang.String.fastSubstring(int,int), private static int java.lang.String.getHashingSeed(), public boolean java.lang.String.contains(java.lang.CharSequence), public boolean java.lang.String.contentEquals(java.lang.CharSequence), public boolean java.lang.String.contentEquals(java.lang.StringBuffer), public boolean java.lang.String.endsWith(java.lang.String), public boolean java.lang.String.equals(java.lang.Object), public boolean java.lang.String.equalsIgnoreCase(java.lang.String), public boolean java.lang.String.isEmpty(), public boolean java.lang.String.matches(java.lang.String), public boolean java.lang.String.regionMatches(boolean,int,java.lang.String,int,int), public boolean java.lang.String.regionMatches(int,java.lang.String,int,int), public boolean java.lang.String.startsWith(java.lang.String), public boolean java.lang.String.startsWith(java.lang.String,int), public byte[] java.lang.String.getBytes(), public byte[] java.lang.String.getBytes(java.lang.String) throws java.io.UnsupportedEncodingException, public byte[] java.lang.String.getBytes(java.nio.charset.Charset), public int java.lang.String.codePointAt(int), public int java.lang.String.codePointBefore(int), public int java.lang.String.codePointCount(int,int), public int java.lang.String.compareTo(java.lang.Object), public int java.lang.String.compareToIgnoreCase(java.lang.String), public int java.lang.String.hashCode(), public int java.lang.String.indexOf(int), public int java.lang.String.indexOf(int,int), public int java.lang.String.indexOf(java.lang.String), public int java.lang.String.indexOf(java.lang.String,int), public int java.lang.String.lastIndexOf(int), public int java.lang.String.lastIndexOf(int,int), public int java.lang.String.lastIndexOf(java.lang.String), public int java.lang.String.lastIndexOf(java.lang.String,int), public int java.lang.String.length(), public int java.lang.String.offsetByCodePoints(int,int), public java.lang.CharSequence java.lang.String.subSequence(int,int), public java.lang.String java.lang.String.replace(char,char), public java.lang.String java.lang.String.replace(java.lang.CharSequence,java.lang.CharSequence), public java.lang.String java.lang.String.replaceAll(java.lang.String,java.lang.String), public java.lang.String java.lang.String.replaceFirst(java.lang.String,java.lang.String), public java.lang.String java.lang.String.substring(int), public java.lang.String java.lang.String.substring(int,int), public java.lang.String java.lang.String.toLowerCase(), public java.lang.String java.lang.String.toLowerCase(java.util.Locale), public java.lang.String java.lang.String.toString(), public java.lang.String java.lang.String.toUpperCase(), public java.lang.String java.lang.String.toUpperCase(java.util.Locale), public java.lang.String java.lang.String.trim(), public java.lang.String[] java.lang.String.split(java.lang.String), public java.lang.String[] java.lang.String.split(java.lang.String,int), public native char java.lang.String.charAt(int), public native char[] java.lang.String.toCharArray(), public native int java.lang.String.compareTo(java.lang.String), public native java.lang.String java.lang.String.concat(java.lang.String), public native java.lang.String java.lang.String.intern(), public static java.lang.String java.lang.String.copyValueOf(char[]), public static java.lang.String java.lang.String.copyValueOf(char[],int,int), public static java.lang.String java.lang.String.format(java.lang.String,java.lang.Object[]), public static java.lang.String java.lang.String.format(java.util.Locale,java.lang.String,java.lang.Object[]), public static java.lang.String java.lang.String.valueOf(boolean), public static java.lang.String java.lang.String.valueOf(char), public static java.lang.String java.lang.String.valueOf(char[]), public static java.lang.String java.lang.String.valueOf(char[],int,int), public static java.lang.String java.lang.String.valueOf(double), public static java.lang.String java.lang.String.valueOf(float), public static java.lang.String java.lang.String.valueOf(int), public static java.lang.String java.lang.String.valueOf(java.lang.Object), public static java.lang.String java.lang.String.valueOf(long), public void java.lang.String.getBytes(int,int,byte[],int), public void java.lang.String.getChars(int,int,char[],int), static int java.lang.String.indexOf(char[],int,int,char[],int,int,int), static int java.lang.String.indexOf(java.lang.String,java.lang.String,int), static int java.lang.String.lastIndexOf(char[],int,int,char[],int,int,int), static int java.lang.String.lastIndexOf(java.lang.String,java.lang.String,int)]
+[private final int java.lang.String.count, private int java.lang.String.hash, private static final java.io.ObjectStreamField[] java.lang.String.serialPersistentFields, private static final long java.lang.String.serialVersionUID, public static final java.util.Comparator java.lang.String.CASE_INSENSITIVE_ORDER]
+[native void java.lang.String.getCharsNoCheck(int,int,char[],int), native void java.lang.String.setCharAt(int,char), private int java.lang.String.indexOfSupplementary(int,int), private int java.lang.String.lastIndexOfSupplementary(int,int), private native int java.lang.String.fastIndexOf(int,int), private native java.lang.String java.lang.String.fastSubstring(int,int), public boolean java.lang.String.contains(java.lang.CharSequence), public boolean java.lang.String.contentEquals(java.lang.CharSequence), public boolean java.lang.String.contentEquals(java.lang.StringBuffer), public boolean java.lang.String.endsWith(java.lang.String), public boolean java.lang.String.equals(java.lang.Object), public boolean java.lang.String.equalsIgnoreCase(java.lang.String), public boolean java.lang.String.isEmpty(), public boolean java.lang.String.matches(java.lang.String), public boolean java.lang.String.regionMatches(boolean,int,java.lang.String,int,int), public boolean java.lang.String.regionMatches(int,java.lang.String,int,int), public boolean java.lang.String.startsWith(java.lang.String), public boolean java.lang.String.startsWith(java.lang.String,int), public byte[] java.lang.String.getBytes(), public byte[] java.lang.String.getBytes(java.lang.String) throws java.io.UnsupportedEncodingException, public byte[] java.lang.String.getBytes(java.nio.charset.Charset), public int java.lang.String.codePointAt(int), public int java.lang.String.codePointBefore(int), public int java.lang.String.codePointCount(int,int), public int java.lang.String.compareTo(java.lang.Object), public int java.lang.String.compareToIgnoreCase(java.lang.String), public int java.lang.String.hashCode(), public int java.lang.String.indexOf(int), public int java.lang.String.indexOf(int,int), public int java.lang.String.indexOf(java.lang.String), public int java.lang.String.indexOf(java.lang.String,int), public int java.lang.String.lastIndexOf(int), public int java.lang.String.lastIndexOf(int,int), public int java.lang.String.lastIndexOf(java.lang.String), public int java.lang.String.lastIndexOf(java.lang.String,int), public int java.lang.String.length(), public int java.lang.String.offsetByCodePoints(int,int), public java.lang.CharSequence java.lang.String.subSequence(int,int), public java.lang.String java.lang.String.replace(char,char), public java.lang.String java.lang.String.replace(java.lang.CharSequence,java.lang.CharSequence), public java.lang.String java.lang.String.replaceAll(java.lang.String,java.lang.String), public java.lang.String java.lang.String.replaceFirst(java.lang.String,java.lang.String), public java.lang.String java.lang.String.substring(int), public java.lang.String java.lang.String.substring(int,int), public java.lang.String java.lang.String.toLowerCase(), public java.lang.String java.lang.String.toLowerCase(java.util.Locale), public java.lang.String java.lang.String.toString(), public java.lang.String java.lang.String.toUpperCase(), public java.lang.String java.lang.String.toUpperCase(java.util.Locale), public java.lang.String java.lang.String.trim(), public java.lang.String[] java.lang.String.split(java.lang.String), public java.lang.String[] java.lang.String.split(java.lang.String,int), public native char java.lang.String.charAt(int), public native char[] java.lang.String.toCharArray(), public native int java.lang.String.compareTo(java.lang.String), public native java.lang.String java.lang.String.concat(java.lang.String), public native java.lang.String java.lang.String.intern(), public static java.lang.String java.lang.String.copyValueOf(char[]), public static java.lang.String java.lang.String.copyValueOf(char[],int,int), public static java.lang.String java.lang.String.format(java.lang.String,java.lang.Object[]), public static java.lang.String java.lang.String.format(java.util.Locale,java.lang.String,java.lang.Object[]), public static java.lang.String java.lang.String.valueOf(boolean), public static java.lang.String java.lang.String.valueOf(char), public static java.lang.String java.lang.String.valueOf(char[]), public static java.lang.String java.lang.String.valueOf(char[],int,int), public static java.lang.String java.lang.String.valueOf(double), public static java.lang.String java.lang.String.valueOf(float), public static java.lang.String java.lang.String.valueOf(int), public static java.lang.String java.lang.String.valueOf(java.lang.Object), public static java.lang.String java.lang.String.valueOf(long), public void java.lang.String.getBytes(int,int,byte[],int), public void java.lang.String.getChars(int,int,char[],int), static int java.lang.String.indexOf(char[],int,int,char[],int,int,int), static int java.lang.String.indexOf(java.lang.String,java.lang.String,int), static int java.lang.String.lastIndexOf(char[],int,int,char[],int,int,int), static int java.lang.String.lastIndexOf(java.lang.String,java.lang.String,int)]
 []
 [interface java.io.Serializable, interface java.lang.Comparable, interface java.lang.CharSequence]
 0
diff --git a/test/800-smali/expected.txt b/test/800-smali/expected.txt
index c2a9a31..11150c2 100644
--- a/test/800-smali/expected.txt
+++ b/test/800-smali/expected.txt
@@ -66,4 +66,5 @@
 b/27799205 (4)
 b/27799205 (5)
 b/27799205 (6)
+b/28187158
 Done!
diff --git a/test/800-smali/smali/b_28187158.smali b/test/800-smali/smali/b_28187158.smali
new file mode 100644
index 0000000..14d5cec
--- /dev/null
+++ b/test/800-smali/smali/b_28187158.smali
@@ -0,0 +1,12 @@
+.class public LB28187158;
+
+# Regression test for iget with wrong classes.
+
+.super Ljava/lang/Object;
+
+.method public static run(Ljava/lang/Integer;)V
+   .registers 2
+   iget v0, p0, Ljava/lang/System;->in:Ljava/io/InputStream;
+   return-void
+.end method
+
diff --git a/test/800-smali/src/Main.java b/test/800-smali/src/Main.java
index 2001cb4..c883b7f 100644
--- a/test/800-smali/src/Main.java
+++ b/test/800-smali/src/Main.java
@@ -174,6 +174,8 @@
         testCases.add(new TestCase("b/27799205 (5)", "B27799205Helper", "run5", null,
                 new VerifyError(), null));
         testCases.add(new TestCase("b/27799205 (6)", "B27799205Helper", "run6", null, null, null));
+        testCases.add(new TestCase("b/28187158", "B28187158", "run", new Object[] { null} ,
+                new VerifyError(), null));
     }
 
     public void runTests() {