diff --git a/compiler/dex/arena_allocator.cc b/compiler/dex/arena_allocator.cc
index 3a3e385..36393e7 100644
--- a/compiler/dex/arena_allocator.cc
+++ b/compiler/dex/arena_allocator.cc
@@ -18,9 +18,14 @@
 #include "dex_file-inl.h"
 #include "arena_allocator.h"
 #include "base/logging.h"
+#include "base/mutex.h"
 
 namespace art {
 
+// Memmap is a bit slower than malloc according to my measurements.
+static constexpr bool kUseMemMap = false;
+static constexpr bool kUseMemSet = true && kUseMemMap;
+
 static const char* alloc_names[ArenaAllocator::kNumAllocKinds] = {
   "Misc       ",
   "BasicBlock ",
@@ -37,108 +42,144 @@
   "Preds      ",
 };
 
-ArenaAllocator::ArenaAllocator(size_t default_size)
-  : default_size_(default_size),
-    block_size_(default_size - sizeof(ArenaMemBlock)),
-    arena_head_(NULL),
-    current_block_(NULL),
-    num_arena_blocks_(0),
-    malloc_bytes_(0),
-    lost_bytes_(0),
-    num_allocations_(0) {
-  memset(&alloc_stats_[0], 0, sizeof(alloc_stats_));
-  // Start with an empty arena.
-  arena_head_ = current_block_ = EmptyArenaBlock();
-  num_arena_blocks_++;
-}
-
-ArenaAllocator::~ArenaAllocator() {
-  // Reclaim all the arena blocks allocated so far.
-  ArenaMemBlock* head = arena_head_;
-  while (head != NULL) {
-    ArenaMemBlock* p = head;
-    head = head->next;
-    free(p);
+Arena::Arena(size_t size)
+    : bytes_allocated_(0),
+      map_(nullptr),
+      next_(nullptr) {
+  if (kUseMemMap) {
+    map_ = MemMap::MapAnonymous("dalvik-arena", NULL, size, PROT_READ | PROT_WRITE);
+    memory_ = map_->Begin();
+    size_ = map_->Size();
+  } else {
+    memory_ = reinterpret_cast<uint8_t*>(calloc(1, size));
+    size_ = size;
   }
-  arena_head_ = NULL;
-  num_arena_blocks_ = 0;
 }
 
-// Return an arena with no storage for use as a sentinal.
-ArenaAllocator::ArenaMemBlock* ArenaAllocator::EmptyArenaBlock() {
-  ArenaMemBlock* res = static_cast<ArenaMemBlock*>(malloc(sizeof(ArenaMemBlock)));
-  malloc_bytes_ += sizeof(ArenaMemBlock);
-  res->block_size = 0;
-  res->bytes_allocated = 0;
-  res->next = NULL;
-  return res;
+Arena::~Arena() {
+  if (kUseMemMap) {
+    delete map_;
+  } else {
+    free(reinterpret_cast<void*>(memory_));
+  }
 }
 
-// Arena-based malloc for compilation tasks.
-void* ArenaAllocator::NewMem(size_t size, bool zero, ArenaAllocKind kind) {
-  DCHECK(current_block_ != NULL);
-  DCHECK(arena_head_ != NULL);
-  size = (size + 3) & ~3;
-  alloc_stats_[kind] += size;
-  ArenaMemBlock* allocation_block = current_block_;  // Assume we'll fit.
-  size_t remaining_space = current_block_->block_size - current_block_->bytes_allocated;
-  if (remaining_space < size) {
-    /*
-     * Time to allocate a new block.  If this is a large allocation or we have
-     * significant space remaining in the current block then fulfill the allocation
-     * request with a custom-sized malloc() - otherwise grab a new standard block.
-     */
-    size_t allocation_size = sizeof(ArenaMemBlock);
-    if ((remaining_space >= ARENA_HIGH_WATER) || (size > block_size_)) {
-      allocation_size += size;
+void Arena::Reset() {
+  if (bytes_allocated_) {
+    if (kUseMemSet || !kUseMemMap) {
+      memset(Begin(), 0, bytes_allocated_);
     } else {
-      allocation_size += block_size_;
+      madvise(Begin(), bytes_allocated_, MADV_DONTNEED);
     }
-    ArenaMemBlock *new_block = static_cast<ArenaMemBlock*>(malloc(allocation_size));
-    if (new_block == NULL) {
-      LOG(FATAL) << "Arena allocation failure";
-    }
-    malloc_bytes_ += allocation_size;
-    new_block->block_size = allocation_size - sizeof(ArenaMemBlock);
-    new_block->bytes_allocated = 0;
-    new_block->next = NULL;
-    num_arena_blocks_++;
-    /*
-     * If the new block is completely full, insert it into the head of the list so we don't
-     * bother trying to fit more and won't hide the potentially allocatable space on the
-     * last (current_block_) block.  TUNING: if we move to a mark scheme, revisit
-     * this code to keep allocation order intact.
-     */
-    if (new_block->block_size == size) {
-      new_block->next = arena_head_;
-      arena_head_ = new_block;
-    } else {
-      int lost = (current_block_->block_size - current_block_->bytes_allocated);
-      lost_bytes_ += lost;
-      current_block_->next = new_block;
-      current_block_ = new_block;
-    }
-    allocation_block = new_block;
+    bytes_allocated_ = 0;
   }
-  void* ptr = &allocation_block->ptr[allocation_block->bytes_allocated];
-  allocation_block->bytes_allocated += size;
-  if (zero) {
-    memset(ptr, 0, size);
-  }
-  num_allocations_++;
-  return ptr;
 }
 
-// Dump memory usage stats.
-void ArenaAllocator::DumpMemStats(std::ostream& os) const {
+ArenaPool::ArenaPool()
+    : lock_("Arena pool lock"),
+      free_arenas_(nullptr) {
+}
+
+ArenaPool::~ArenaPool() {
+  while (free_arenas_ != nullptr) {
+    auto* arena = free_arenas_;
+    free_arenas_ = free_arenas_->next_;
+    delete arena;
+  }
+}
+
+Arena* ArenaPool::AllocArena(size_t size) {
+  Thread* self = Thread::Current();
+  Arena* ret = nullptr;
+  {
+    MutexLock lock(self, lock_);
+    if (free_arenas_ != nullptr && LIKELY(free_arenas_->Size() >= size)) {
+      ret = free_arenas_;
+      free_arenas_ = free_arenas_->next_;
+    }
+  }
+  if (ret == nullptr) {
+    ret = new Arena(size);
+  }
+  ret->Reset();
+  return ret;
+}
+
+void ArenaPool::FreeArena(Arena* arena) {
+  Thread* self = Thread::Current();
+  {
+    MutexLock lock(self, lock_);
+    arena->next_ = free_arenas_;
+    free_arenas_ = arena;
+  }
+}
+
+size_t ArenaAllocator::BytesAllocated() const {
   size_t total = 0;
   for (int i = 0; i < kNumAllocKinds; i++) {
     total += alloc_stats_[i];
   }
-  os << " MEM: used: " << total << ", allocated: " << malloc_bytes_
-     << ", lost: " << lost_bytes_ << "\n";
-  os << "Number of blocks allocated: " << num_arena_blocks_ << ", Number of allocations: "
-     << num_allocations_ << ", avg: " << total / num_allocations_ << "\n";
+  return total;
+}
+
+ArenaAllocator::ArenaAllocator(ArenaPool* pool)
+  : pool_(pool),
+    begin_(nullptr),
+    end_(nullptr),
+    ptr_(nullptr),
+    arena_head_(nullptr),
+    num_allocations_(0) {
+  memset(&alloc_stats_[0], 0, sizeof(alloc_stats_));
+}
+
+void ArenaAllocator::UpdateBytesAllocated() {
+  if (arena_head_ != nullptr) {
+    // Update how many bytes we have allocated into the arena so that the arena pool knows how
+    // much memory to zero out.
+    arena_head_->bytes_allocated_ = ptr_ - begin_;
+  }
+}
+
+ArenaAllocator::~ArenaAllocator() {
+  // Reclaim all the arenas by giving them back to the thread pool.
+  UpdateBytesAllocated();
+  while (arena_head_ != nullptr) {
+    Arena* arena = arena_head_;
+    arena_head_ = arena_head_->next_;
+    pool_->FreeArena(arena);
+  }
+}
+
+void ArenaAllocator::ObtainNewArenaForAllocation(size_t allocation_size) {
+  UpdateBytesAllocated();
+  Arena* new_arena = pool_->AllocArena(std::max(Arena::kDefaultSize, allocation_size));
+  new_arena->next_ = arena_head_;
+  arena_head_ = new_arena;
+  // Update our internal data structures.
+  ptr_ = begin_ = new_arena->Begin();
+  end_ = new_arena->End();
+}
+
+// Dump memory usage stats.
+void ArenaAllocator::DumpMemStats(std::ostream& os) const {
+  size_t malloc_bytes = 0;
+  // Start out with how many lost bytes we have in the arena we are currently allocating into.
+  size_t lost_bytes(end_ - ptr_);
+  size_t num_arenas = 0;
+  for (Arena* arena = arena_head_; arena != nullptr; arena = arena->next_) {
+    malloc_bytes += arena->Size();
+    if (arena != arena_head_) {
+      lost_bytes += arena->RemainingSpace();
+    }
+    ++num_arenas;
+  }
+  const size_t bytes_allocated = BytesAllocated();
+  os << " MEM: used: " << bytes_allocated << ", allocated: " << malloc_bytes
+     << ", lost: " << lost_bytes << "\n";
+  if (num_allocations_ != 0) {
+    os << "Number of arenas allocated: " << num_arenas << ", Number of allocations: "
+       << num_allocations_ << ", avg size: " << bytes_allocated / num_allocations_ << "\n";
+  }
   os << "===== Allocation by kind\n";
   for (int i = 0; i < kNumAllocKinds; i++) {
       os << alloc_names[i] << std::setw(10) << alloc_stats_[i] << "\n";
diff --git a/compiler/dex/arena_allocator.h b/compiler/dex/arena_allocator.h
index e8e2c02..dda52a2 100644
--- a/compiler/dex/arena_allocator.h
+++ b/compiler/dex/arena_allocator.h
@@ -19,65 +19,127 @@
 
 #include <stdint.h>
 #include <stddef.h>
+
+#include "base/mutex.h"
 #include "compiler_enums.h"
+#include "mem_map.h"
 
 namespace art {
 
-#define ARENA_DEFAULT_BLOCK_SIZE (256 * 1024)
-#define ARENA_HIGH_WATER (16 * 1024)
+class Arena;
+class ArenaPool;
+class ArenaAllocator;
 
-class ArenaAllocator {
-  public:
-    // Type of allocation for memory tuning.
-    enum ArenaAllocKind {
-      kAllocMisc,
-      kAllocBB,
-      kAllocLIR,
-      kAllocMIR,
-      kAllocDFInfo,
-      kAllocGrowableArray,
-      kAllocGrowableBitMap,
-      kAllocDalvikToSSAMap,
-      kAllocDebugInfo,
-      kAllocSuccessor,
-      kAllocRegAlloc,
-      kAllocData,
-      kAllocPredecessors,
-      kNumAllocKinds
-    };
-
-  explicit ArenaAllocator(size_t default_size = ARENA_DEFAULT_BLOCK_SIZE);
-  ~ArenaAllocator();
-  void* NewMem(size_t size, bool zero, ArenaAllocKind kind);
-  size_t BytesAllocated() {
-    return malloc_bytes_;
+class Arena {
+ public:
+  static constexpr size_t kDefaultSize = 128 * KB;
+  explicit Arena(size_t size = kDefaultSize);
+  ~Arena();
+  void Reset();
+  uint8_t* Begin() {
+    return memory_;
   }
 
+  uint8_t* End() {
+    return memory_ + size_;
+  }
+
+  size_t Size() const {
+    return size_;
+  }
+
+  size_t RemainingSpace() const {
+    return Size() - bytes_allocated_;
+  }
+
+ private:
+  size_t bytes_allocated_;
+  uint8_t* memory_;
+  size_t size_;
+  MemMap* map_;
+  Arena* next_;
+  friend class ArenaPool;
+  friend class ArenaAllocator;
+  DISALLOW_COPY_AND_ASSIGN(Arena);
+};
+
+class ArenaPool {
+ public:
+  ArenaPool();
+  ~ArenaPool();
+  Arena* AllocArena(size_t size);
+  void FreeArena(Arena* arena);
+
+ private:
+  Mutex lock_ DEFAULT_MUTEX_ACQUIRED_AFTER;
+  Arena* free_arenas_ GUARDED_BY(lock_);
+  DISALLOW_COPY_AND_ASSIGN(ArenaPool);
+};
+
+class ArenaAllocator {
+ public:
+  // Type of allocation for memory tuning.
+  enum ArenaAllocKind {
+    kAllocMisc,
+    kAllocBB,
+    kAllocLIR,
+    kAllocMIR,
+    kAllocDFInfo,
+    kAllocGrowableArray,
+    kAllocGrowableBitMap,
+    kAllocDalvikToSSAMap,
+    kAllocDebugInfo,
+    kAllocSuccessor,
+    kAllocRegAlloc,
+    kAllocData,
+    kAllocPredecessors,
+    kNumAllocKinds
+  };
+
+  static constexpr bool kCountAllocations = false;
+
+  explicit ArenaAllocator(ArenaPool* pool);
+  ~ArenaAllocator();
+
+  // Returns zeroed memory.
+  void* Alloc(size_t bytes, ArenaAllocKind kind) ALWAYS_INLINE {
+    bytes = (bytes + 3) & ~3;
+    if (UNLIKELY(ptr_ + bytes > end_)) {
+      // Obtain a new block.
+      ObtainNewArenaForAllocation(bytes);
+      if (UNLIKELY(ptr_ == nullptr)) {
+        return nullptr;
+      }
+    }
+    if (kCountAllocations) {
+      alloc_stats_[kind] += bytes;
+      ++num_allocations_;
+    }
+    uint8_t* ret = ptr_;
+    ptr_ += bytes;
+    return ret;
+  }
+
+  void ObtainNewArenaForAllocation(size_t allocation_size);
+  size_t BytesAllocated() const;
   void DumpMemStats(std::ostream& os) const;
 
-  private:
-    // Variable-length allocation block.
-    struct ArenaMemBlock {
-      size_t block_size;
-      size_t bytes_allocated;
-      ArenaMemBlock *next;
-      char ptr[0];
-    };
+ private:
+  void UpdateBytesAllocated();
 
-    ArenaMemBlock* EmptyArenaBlock();
+  ArenaPool* pool_;
+  uint8_t* begin_;
+  uint8_t* end_;
+  uint8_t* ptr_;
+  Arena* arena_head_;
 
-    size_t default_size_;                    // Smallest size of new allocation block.
-    size_t block_size_;                      // Amount of allocatable bytes on a default block.
-    ArenaMemBlock* arena_head_;              // Head of linked list of allocation blocks.
-    ArenaMemBlock* current_block_;           // NOTE: code assumes there's always at least 1 block.
-    int num_arena_blocks_;
-    uint32_t malloc_bytes_;                  // Number of actual bytes malloc'd
-    uint32_t alloc_stats_[kNumAllocKinds];   // Bytes used by various allocation kinds.
-    uint32_t lost_bytes_;                    // Lost memory at end of too-small region
-    uint32_t num_allocations_;
+  // Statistics.
+  size_t num_allocations_;
+  size_t alloc_stats_[kNumAllocKinds];   // Bytes used by various allocation kinds.
+
+  DISALLOW_COPY_AND_ASSIGN(ArenaAllocator);
 };  // ArenaAllocator
 
-
 struct MemStats {
    public:
      void Dump(std::ostream& os) const {
diff --git a/compiler/dex/arena_bit_vector.cc b/compiler/dex/arena_bit_vector.cc
index 724fdf8..3fa9295 100644
--- a/compiler/dex/arena_bit_vector.cc
+++ b/compiler/dex/arena_bit_vector.cc
@@ -35,8 +35,8 @@
      expandable_(expandable),
      kind_(kind),
      storage_size_((start_bits + 31) >> 5),
-     storage_(static_cast<uint32_t*>(arena_->NewMem(storage_size_ * sizeof(uint32_t), true,
-                                                    ArenaAllocator::kAllocGrowableBitMap))) {
+     storage_(static_cast<uint32_t*>(arena_->Alloc(storage_size_ * sizeof(uint32_t),
+                                                   ArenaAllocator::kAllocGrowableBitMap))) {
   DCHECK_EQ(sizeof(storage_[0]), 4U);    // Assuming 32-bit units.
 }
 
@@ -68,8 +68,8 @@
     unsigned int new_size = (num + 1 + 31) >> 5;
     DCHECK_GT(new_size, storage_size_);
     uint32_t *new_storage =
-        static_cast<uint32_t*>(arena_->NewMem(new_size * sizeof(uint32_t), false,
-                                              ArenaAllocator::kAllocGrowableBitMap));
+        static_cast<uint32_t*>(arena_->Alloc(new_size * sizeof(uint32_t),
+                                             ArenaAllocator::kAllocGrowableBitMap));
     memcpy(new_storage, storage_, storage_size_ * sizeof(uint32_t));
     // Zero out the new storage words.
     memset(&new_storage[storage_size_], 0, (new_size - storage_size_) * sizeof(uint32_t));
diff --git a/compiler/dex/arena_bit_vector.h b/compiler/dex/arena_bit_vector.h
index 4ec8c88..8bcd628 100644
--- a/compiler/dex/arena_bit_vector.h
+++ b/compiler/dex/arena_bit_vector.h
@@ -67,8 +67,8 @@
         }
 
         static void* operator new(size_t size, ArenaAllocator* arena) {
-          return arena->NewMem(sizeof(ArenaBitVector::Iterator), true,
-                               ArenaAllocator::kAllocGrowableBitMap);
+          return arena->Alloc(sizeof(ArenaBitVector::Iterator),
+                              ArenaAllocator::kAllocGrowableBitMap);
         };
         static void operator delete(void* p) {}  // Nop.
 
@@ -84,7 +84,7 @@
     ~ArenaBitVector() {}
 
     static void* operator new(size_t size, ArenaAllocator* arena) {
-      return arena->NewMem(sizeof(ArenaBitVector), true, ArenaAllocator::kAllocGrowableBitMap);
+      return arena->Alloc(sizeof(ArenaBitVector), ArenaAllocator::kAllocGrowableBitMap);
     }
     static void operator delete(void* p) {}  // Nop.
 
diff --git a/compiler/dex/compiler_ir.h b/compiler/dex/compiler_ir.h
index a9b5bf6..26d0923 100644
--- a/compiler/dex/compiler_ir.h
+++ b/compiler/dex/compiler_ir.h
@@ -43,7 +43,7 @@
 class Mir2Lir;
 
 struct CompilationUnit {
-  CompilationUnit()
+  explicit CompilationUnit(ArenaPool* pool)
     : compiler_driver(NULL),
       class_linker(NULL),
       dex_file(NULL),
@@ -66,6 +66,7 @@
       num_regs(0),
       num_compiler_temps(0),
       compiler_flip_match(false),
+      arena(pool),
       mir_graph(NULL),
       cg(NULL) {}
   /*
diff --git a/compiler/dex/frontend.cc b/compiler/dex/frontend.cc
index d1f7f3e..2303649 100644
--- a/compiler/dex/frontend.cc
+++ b/compiler/dex/frontend.cc
@@ -119,30 +119,30 @@
   VLOG(compiler) << "Compiling " << PrettyMethod(method_idx, dex_file) << "...";
 
   ClassLinker* class_linker = Runtime::Current()->GetClassLinker();
-  UniquePtr<CompilationUnit> cu(new CompilationUnit);
+  CompilationUnit cu(&compiler.GetArenaPool());
 
-  cu->compiler_driver = &compiler;
-  cu->class_linker = class_linker;
-  cu->instruction_set = compiler.GetInstructionSet();
-  cu->compiler_backend = compiler_backend;
-  DCHECK((cu->instruction_set == kThumb2) ||
-         (cu->instruction_set == kX86) ||
-         (cu->instruction_set == kMips));
+  cu.compiler_driver = &compiler;
+  cu.class_linker = class_linker;
+  cu.instruction_set = compiler.GetInstructionSet();
+  cu.compiler_backend = compiler_backend;
+  DCHECK((cu.instruction_set == kThumb2) ||
+         (cu.instruction_set == kX86) ||
+         (cu.instruction_set == kMips));
 
 
   /* Adjust this value accordingly once inlining is performed */
-  cu->num_dalvik_registers = code_item->registers_size_;
+  cu.num_dalvik_registers = code_item->registers_size_;
   // TODO: set this from command line
-  cu->compiler_flip_match = false;
-  bool use_match = !cu->compiler_method_match.empty();
-  bool match = use_match && (cu->compiler_flip_match ^
-      (PrettyMethod(method_idx, dex_file).find(cu->compiler_method_match) !=
+  cu.compiler_flip_match = false;
+  bool use_match = !cu.compiler_method_match.empty();
+  bool match = use_match && (cu.compiler_flip_match ^
+      (PrettyMethod(method_idx, dex_file).find(cu.compiler_method_match) !=
        std::string::npos));
   if (!use_match || match) {
-    cu->disable_opt = kCompilerOptimizerDisableFlags;
-    cu->enable_debug = kCompilerDebugFlags;
-    cu->verbose = VLOG_IS_ON(compiler) ||
-        (cu->enable_debug & (1 << kDebugVerbose));
+    cu.disable_opt = kCompilerOptimizerDisableFlags;
+    cu.enable_debug = kCompilerDebugFlags;
+    cu.verbose = VLOG_IS_ON(compiler) ||
+        (cu.enable_debug & (1 << kDebugVerbose));
   }
 
   /*
@@ -152,12 +152,12 @@
 
   if (compiler_backend == kPortable) {
     // Fused long branches not currently usseful in bitcode.
-    cu->disable_opt |= (1 << kBranchFusing);
+    cu.disable_opt |= (1 << kBranchFusing);
   }
 
-  if (cu->instruction_set == kMips) {
+  if (cu.instruction_set == kMips) {
     // Disable some optimizations for mips for now
-    cu->disable_opt |= (
+    cu.disable_opt |= (
         (1 << kLoadStoreElimination) |
         (1 << kLoadHoisting) |
         (1 << kSuppressLoads) |
@@ -170,72 +170,71 @@
         (1 << kPromoteCompilerTemps));
   }
 
-  cu->mir_graph.reset(new MIRGraph(cu.get(), &cu->arena));
+  cu.mir_graph.reset(new MIRGraph(&cu, &cu.arena));
 
   /* Gathering opcode stats? */
   if (kCompilerDebugFlags & (1 << kDebugCountOpcodes)) {
-    cu->mir_graph->EnableOpcodeCounting();
+    cu.mir_graph->EnableOpcodeCounting();
   }
 
   /* Build the raw MIR graph */
-  cu->mir_graph->InlineMethod(code_item, access_flags, invoke_type, class_def_idx, method_idx,
+  cu.mir_graph->InlineMethod(code_item, access_flags, invoke_type, class_def_idx, method_idx,
                               class_loader, dex_file);
 
 #if !defined(ART_USE_PORTABLE_COMPILER)
-  if (cu->mir_graph->SkipCompilation(Runtime::Current()->GetCompilerFilter())) {
+  if (cu.mir_graph->SkipCompilation(Runtime::Current()->GetCompilerFilter())) {
     return NULL;
   }
 #endif
 
   /* Do a code layout pass */
-  cu->mir_graph->CodeLayout();
+  cu.mir_graph->CodeLayout();
 
   /* Perform SSA transformation for the whole method */
-  cu->mir_graph->SSATransformation();
+  cu.mir_graph->SSATransformation();
 
   /* Do constant propagation */
-  cu->mir_graph->PropagateConstants();
+  cu.mir_graph->PropagateConstants();
 
   /* Count uses */
-  cu->mir_graph->MethodUseCount();
+  cu.mir_graph->MethodUseCount();
 
   /* Perform null check elimination */
-  cu->mir_graph->NullCheckElimination();
+  cu.mir_graph->NullCheckElimination();
 
   /* Combine basic blocks where possible */
-  cu->mir_graph->BasicBlockCombine();
+  cu.mir_graph->BasicBlockCombine();
 
   /* Do some basic block optimizations */
-  cu->mir_graph->BasicBlockOptimization();
+  cu.mir_graph->BasicBlockOptimization();
 
-  if (cu->enable_debug & (1 << kDebugDumpCheckStats)) {
-    cu->mir_graph->DumpCheckStats();
+  if (cu.enable_debug & (1 << kDebugDumpCheckStats)) {
+    cu.mir_graph->DumpCheckStats();
   }
 
   if (kCompilerDebugFlags & (1 << kDebugCountOpcodes)) {
-    cu->mir_graph->ShowOpcodeStats();
+    cu.mir_graph->ShowOpcodeStats();
   }
 
   /* Set up regLocation[] array to describe values - one for each ssa_name. */
-  cu->mir_graph->BuildRegLocations();
+  cu.mir_graph->BuildRegLocations();
 
   CompiledMethod* result = NULL;
 
 #if defined(ART_USE_PORTABLE_COMPILER)
   if (compiler_backend == kPortable) {
-    cu->cg.reset(PortableCodeGenerator(cu.get(), cu->mir_graph.get(), &cu->arena,
-                                       llvm_compilation_unit));
+    cu.cg.reset(PortableCodeGenerator(&cu, cu.mir_graph.get(), &cu.arena, llvm_compilation_unit));
   } else {
 #endif
     switch (compiler.GetInstructionSet()) {
       case kThumb2:
-        cu->cg.reset(ArmCodeGenerator(cu.get(), cu->mir_graph.get(), &cu->arena));
+        cu.cg.reset(ArmCodeGenerator(&cu, cu.mir_graph.get(), &cu.arena));
         break;
       case kMips:
-        cu->cg.reset(MipsCodeGenerator(cu.get(), cu->mir_graph.get(), &cu->arena));
+        cu.cg.reset(MipsCodeGenerator(&cu, cu.mir_graph.get(), &cu.arena));
         break;
       case kX86:
-        cu->cg.reset(X86CodeGenerator(cu.get(), cu->mir_graph.get(), &cu->arena));
+        cu.cg.reset(X86CodeGenerator(&cu, cu.mir_graph.get(), &cu.arena));
         break;
       default:
         LOG(FATAL) << "Unexpected instruction set: " << compiler.GetInstructionSet();
@@ -244,9 +243,9 @@
   }
 #endif
 
-  cu->cg->Materialize();
+  cu.cg->Materialize();
 
-  result = cu->cg->GetCompiledMethod();
+  result = cu.cg->GetCompiledMethod();
 
   if (result) {
     VLOG(compiler) << "Compiled " << PrettyMethod(method_idx, dex_file);
@@ -254,15 +253,15 @@
     VLOG(compiler) << "Deferred " << PrettyMethod(method_idx, dex_file);
   }
 
-  if (cu->enable_debug & (1 << kDebugShowMemoryUsage)) {
-    if (cu->arena.BytesAllocated() > (5 * 1024 *1024)) {
-      MemStats mem_stats(cu->arena);
+  if (cu.enable_debug & (1 << kDebugShowMemoryUsage)) {
+    if (cu.arena.BytesAllocated() > (5 * 1024 *1024)) {
+      MemStats mem_stats(cu.arena);
       LOG(INFO) << PrettyMethod(method_idx, dex_file) << " " << Dumpable<MemStats>(mem_stats);
     }
   }
 
-  if (cu->enable_debug & (1 << kDebugShowSummaryMemoryUsage)) {
-    LOG(INFO) << "MEMINFO " << cu->arena.BytesAllocated() << " " << cu->mir_graph->GetNumBlocks()
+  if (cu.enable_debug & (1 << kDebugShowSummaryMemoryUsage)) {
+    LOG(INFO) << "MEMINFO " << cu.arena.BytesAllocated() << " " << cu.mir_graph->GetNumBlocks()
               << " " << PrettyMethod(method_idx, dex_file);
   }
 
diff --git a/compiler/dex/growable_array.h b/compiler/dex/growable_array.h
index 08a6478..8e2abfb 100644
--- a/compiler/dex/growable_array.h
+++ b/compiler/dex/growable_array.h
@@ -67,7 +67,7 @@
         }
 
         static void* operator new(size_t size, ArenaAllocator* arena) {
-          return arena->NewMem(sizeof(GrowableArray::Iterator), true, ArenaAllocator::kAllocGrowableArray);
+          return arena->Alloc(sizeof(GrowableArray::Iterator), ArenaAllocator::kAllocGrowableArray);
         };
         static void operator delete(void* p) {}  // Nop.
 
@@ -81,8 +81,8 @@
         num_allocated_(init_length),
         num_used_(0),
         kind_(kind) {
-      elem_list_ = static_cast<T*>(arena_->NewMem(sizeof(T) * init_length, true,
-                                                  ArenaAllocator::kAllocGrowableArray));
+      elem_list_ = static_cast<T*>(arena_->Alloc(sizeof(T) * init_length,
+                                                 ArenaAllocator::kAllocGrowableArray));
     };
 
 
@@ -95,8 +95,8 @@
       if (new_length > target_length) {
          target_length = new_length;
       }
-      T* new_array = static_cast<T*>(arena_->NewMem(sizeof(T) * target_length, true,
-                                                    ArenaAllocator::kAllocGrowableArray));
+      T* new_array = static_cast<T*>(arena_->Alloc(sizeof(T) * target_length,
+                                                   ArenaAllocator::kAllocGrowableArray));
       memcpy(new_array, elem_list_, sizeof(T) * num_allocated_);
       num_allocated_ = target_length;
       elem_list_ = new_array;
@@ -153,7 +153,7 @@
     T* GetRawStorage() const { return elem_list_; }
 
     static void* operator new(size_t size, ArenaAllocator* arena) {
-      return arena->NewMem(sizeof(GrowableArray<T>), true, ArenaAllocator::kAllocGrowableArray);
+      return arena->Alloc(sizeof(GrowableArray<T>), ArenaAllocator::kAllocGrowableArray);
     };
     static void operator delete(void* p) {}  // Nop.
 
diff --git a/compiler/dex/mir_dataflow.cc b/compiler/dex/mir_dataflow.cc
index c3a33ff..3a73717 100644
--- a/compiler/dex/mir_dataflow.cc
+++ b/compiler/dex/mir_dataflow.cc
@@ -954,11 +954,11 @@
   int i;
 
   mir->ssa_rep->num_uses = num_uses;
-  mir->ssa_rep->uses = static_cast<int*>(arena_->NewMem(sizeof(int) * num_uses, true,
-                                                        ArenaAllocator::kAllocDFInfo));
+  mir->ssa_rep->uses = static_cast<int*>(arena_->Alloc(sizeof(int) * num_uses,
+                                                       ArenaAllocator::kAllocDFInfo));
   // NOTE: will be filled in during type & size inference pass
-  mir->ssa_rep->fp_use = static_cast<bool*>(arena_->NewMem(sizeof(bool) * num_uses, true,
-                                                           ArenaAllocator::kAllocDFInfo));
+  mir->ssa_rep->fp_use = static_cast<bool*>(arena_->Alloc(sizeof(bool) * num_uses,
+                                                          ArenaAllocator::kAllocDFInfo));
 
   for (i = 0; i < num_uses; i++) {
     HandleSSAUse(mir->ssa_rep->uses, d_insn->arg[i], i);
@@ -972,11 +972,11 @@
   int i;
 
   mir->ssa_rep->num_uses = num_uses;
-  mir->ssa_rep->uses = static_cast<int*>(arena_->NewMem(sizeof(int) * num_uses, true,
-                                                        ArenaAllocator::kAllocDFInfo));
+  mir->ssa_rep->uses = static_cast<int*>(arena_->Alloc(sizeof(int) * num_uses,
+                                                       ArenaAllocator::kAllocDFInfo));
   // NOTE: will be filled in during type & size inference pass
-  mir->ssa_rep->fp_use = static_cast<bool*>(arena_->NewMem(sizeof(bool) * num_uses, true,
-                                                           ArenaAllocator::kAllocDFInfo));
+  mir->ssa_rep->fp_use = static_cast<bool*>(arena_->Alloc(sizeof(bool) * num_uses,
+                                                          ArenaAllocator::kAllocDFInfo));
 
   for (i = 0; i < num_uses; i++) {
     HandleSSAUse(mir->ssa_rep->uses, d_insn->vC+i, i);
@@ -991,8 +991,8 @@
 
   for (mir = bb->first_mir_insn; mir != NULL; mir = mir->next) {
     mir->ssa_rep =
-        static_cast<struct SSARepresentation *>(arena_->NewMem(sizeof(SSARepresentation), true,
-                                                               ArenaAllocator::kAllocDFInfo));
+        static_cast<struct SSARepresentation *>(arena_->Alloc(sizeof(SSARepresentation),
+                                                              ArenaAllocator::kAllocDFInfo));
 
     int df_attributes = oat_data_flow_attributes_[mir->dalvikInsn.opcode];
 
@@ -1041,10 +1041,10 @@
 
     if (num_uses) {
       mir->ssa_rep->num_uses = num_uses;
-      mir->ssa_rep->uses = static_cast<int*>(arena_->NewMem(sizeof(int) * num_uses, false,
-                                                            ArenaAllocator::kAllocDFInfo));
-      mir->ssa_rep->fp_use = static_cast<bool*>(arena_->NewMem(sizeof(bool) * num_uses, false,
-                                                               ArenaAllocator::kAllocDFInfo));
+      mir->ssa_rep->uses = static_cast<int*>(arena_->Alloc(sizeof(int) * num_uses,
+                                                           ArenaAllocator::kAllocDFInfo));
+      mir->ssa_rep->fp_use = static_cast<bool*>(arena_->Alloc(sizeof(bool) * num_uses,
+                                                              ArenaAllocator::kAllocDFInfo));
     }
 
     int num_defs = 0;
@@ -1058,10 +1058,10 @@
 
     if (num_defs) {
       mir->ssa_rep->num_defs = num_defs;
-      mir->ssa_rep->defs = static_cast<int*>(arena_->NewMem(sizeof(int) * num_defs, false,
-                                                            ArenaAllocator::kAllocDFInfo));
-      mir->ssa_rep->fp_def = static_cast<bool*>(arena_->NewMem(sizeof(bool) * num_defs, false,
-                                                               ArenaAllocator::kAllocDFInfo));
+      mir->ssa_rep->defs = static_cast<int*>(arena_->Alloc(sizeof(int) * num_defs,
+                                                           ArenaAllocator::kAllocDFInfo));
+      mir->ssa_rep->fp_def = static_cast<bool*>(arena_->Alloc(sizeof(bool) * num_defs,
+                                                              ArenaAllocator::kAllocDFInfo));
     }
 
     DecodedInstruction *d_insn = &mir->dalvikInsn;
@@ -1109,8 +1109,8 @@
    * predecessor blocks.
    */
   bb->data_flow_info->vreg_to_ssa_map =
-      static_cast<int*>(arena_->NewMem(sizeof(int) * cu_->num_dalvik_registers, false,
-                                       ArenaAllocator::kAllocDFInfo));
+      static_cast<int*>(arena_->Alloc(sizeof(int) * cu_->num_dalvik_registers,
+                                      ArenaAllocator::kAllocDFInfo));
 
   memcpy(bb->data_flow_info->vreg_to_ssa_map, vreg_to_ssa_map_,
          sizeof(int) * cu_->num_dalvik_registers);
@@ -1146,12 +1146,12 @@
    * Dalvik register, and the SSA names for those are the same.
    */
   vreg_to_ssa_map_ =
-      static_cast<int*>(arena_->NewMem(sizeof(int) * num_dalvik_reg, false,
-                                       ArenaAllocator::kAllocDFInfo));
+      static_cast<int*>(arena_->Alloc(sizeof(int) * num_dalvik_reg,
+                                      ArenaAllocator::kAllocDFInfo));
   /* Keep track of the higest def for each dalvik reg */
   ssa_last_defs_ =
-      static_cast<int*>(arena_->NewMem(sizeof(int) * num_dalvik_reg, false,
-                                       ArenaAllocator::kAllocDFInfo));
+      static_cast<int*>(arena_->Alloc(sizeof(int) * num_dalvik_reg,
+                                      ArenaAllocator::kAllocDFInfo));
 
   for (unsigned int i = 0; i < num_dalvik_reg; i++) {
     vreg_to_ssa_map_[i] = i;
@@ -1174,8 +1174,8 @@
       bb->block_type == kEntryBlock ||
       bb->block_type == kExitBlock) {
       bb->data_flow_info =
-          static_cast<BasicBlockDataFlow*>(arena_->NewMem(sizeof(BasicBlockDataFlow), true,
-                                                          ArenaAllocator::kAllocDFInfo));
+          static_cast<BasicBlockDataFlow*>(arena_->Alloc(sizeof(BasicBlockDataFlow),
+                                                         ArenaAllocator::kAllocDFInfo));
       }
   }
 }
diff --git a/compiler/dex/mir_graph.cc b/compiler/dex/mir_graph.cc
index 86f6ee5..81702e3 100644
--- a/compiler/dex/mir_graph.cc
+++ b/compiler/dex/mir_graph.cc
@@ -399,8 +399,8 @@
     BasicBlock *case_block = FindBlock(cur_offset + target_table[i], /* split */ true,
                                       /* create */ true, /* immed_pred_block_p */ &cur_block);
     SuccessorBlockInfo *successor_block_info =
-        static_cast<SuccessorBlockInfo*>(arena_->NewMem(sizeof(SuccessorBlockInfo), false,
-                                                        ArenaAllocator::kAllocSuccessor));
+        static_cast<SuccessorBlockInfo*>(arena_->Alloc(sizeof(SuccessorBlockInfo),
+                                                       ArenaAllocator::kAllocSuccessor));
     successor_block_info->block = case_block;
     successor_block_info->key =
         (insn->dalvikInsn.opcode == Instruction::PACKED_SWITCH) ?
@@ -444,7 +444,7 @@
         catches_.insert(catch_block->start_offset);
       }
       SuccessorBlockInfo *successor_block_info = reinterpret_cast<SuccessorBlockInfo*>
-          (arena_->NewMem(sizeof(SuccessorBlockInfo), false, ArenaAllocator::kAllocSuccessor));
+          (arena_->Alloc(sizeof(SuccessorBlockInfo), ArenaAllocator::kAllocSuccessor));
       successor_block_info->block = catch_block;
       successor_block_info->key = iterator.GetHandlerTypeIndex();
       cur_block->successor_block_list.blocks->Insert(successor_block_info);
@@ -490,7 +490,7 @@
   new_block->start_offset = insn->offset;
   cur_block->fall_through = new_block;
   new_block->predecessors->Insert(cur_block);
-  MIR* new_insn = static_cast<MIR*>(arena_->NewMem(sizeof(MIR), true, ArenaAllocator::kAllocMIR));
+  MIR* new_insn = static_cast<MIR*>(arena_->Alloc(sizeof(MIR), ArenaAllocator::kAllocMIR));
   *new_insn = *insn;
   insn->dalvikInsn.opcode =
       static_cast<Instruction::Code>(kMirOpCheck);
@@ -571,13 +571,12 @@
   int num_patterns = sizeof(special_patterns)/sizeof(special_patterns[0]);
   bool live_pattern = (num_patterns > 0) && !(cu_->disable_opt & (1 << kMatch));
   bool* dead_pattern =
-      static_cast<bool*>(arena_->NewMem(sizeof(bool) * num_patterns, true,
-                                        ArenaAllocator::kAllocMisc));
+      static_cast<bool*>(arena_->Alloc(sizeof(bool) * num_patterns, ArenaAllocator::kAllocMisc));
   int pattern_pos = 0;
 
   /* Parse all instructions and put them into containing basic blocks */
   while (code_ptr < code_end) {
-    MIR *insn = static_cast<MIR *>(arena_->NewMem(sizeof(MIR), true, ArenaAllocator::kAllocMIR));
+    MIR *insn = static_cast<MIR *>(arena_->Alloc(sizeof(MIR), ArenaAllocator::kAllocMIR));
     insn->offset = current_offset_;
     insn->m_unit_index = current_method_;
     int width = ParseInsn(code_ptr, &insn->dalvikInsn);
@@ -1002,7 +1001,7 @@
     str.append("]--optimized away");
   }
   int length = str.length() + 1;
-  ret = static_cast<char*>(arena_->NewMem(length, false, ArenaAllocator::kAllocDFInfo));
+  ret = static_cast<char*>(arena_->Alloc(length, ArenaAllocator::kAllocDFInfo));
   strncpy(ret, str.c_str(), length);
   return ret;
 }
@@ -1115,8 +1114,8 @@
  */
 CallInfo* MIRGraph::NewMemCallInfo(BasicBlock* bb, MIR* mir, InvokeType type,
                                   bool is_range) {
-  CallInfo* info = static_cast<CallInfo*>(arena_->NewMem(sizeof(CallInfo), true,
-                                                         ArenaAllocator::kAllocMisc));
+  CallInfo* info = static_cast<CallInfo*>(arena_->Alloc(sizeof(CallInfo),
+                                                        ArenaAllocator::kAllocMisc));
   MIR* move_result_mir = FindMoveResult(bb, mir);
   if (move_result_mir == NULL) {
     info->result.location = kLocInvalid;
@@ -1127,8 +1126,7 @@
   }
   info->num_arg_words = mir->ssa_rep->num_uses;
   info->args = (info->num_arg_words == 0) ? NULL : static_cast<RegLocation*>
-      (arena_->NewMem(sizeof(RegLocation) * info->num_arg_words, false,
-                      ArenaAllocator::kAllocMisc));
+      (arena_->Alloc(sizeof(RegLocation) * info->num_arg_words, ArenaAllocator::kAllocMisc));
   for (int i = 0; i < info->num_arg_words; i++) {
     info->args[i] = GetRawSrc(mir, i);
   }
@@ -1142,8 +1140,8 @@
 
 // Allocate a new basic block.
 BasicBlock* MIRGraph::NewMemBB(BBType block_type, int block_id) {
-  BasicBlock* bb = static_cast<BasicBlock*>(arena_->NewMem(sizeof(BasicBlock), true,
-                                                           ArenaAllocator::kAllocBB));
+  BasicBlock* bb = static_cast<BasicBlock*>(arena_->Alloc(sizeof(BasicBlock),
+                                                          ArenaAllocator::kAllocBB));
   bb->block_type = block_type;
   bb->id = block_id;
   // TUNING: better estimate of the exit block predecessors?
diff --git a/compiler/dex/mir_graph.h b/compiler/dex/mir_graph.h
index c02deab..28ab283 100644
--- a/compiler/dex/mir_graph.h
+++ b/compiler/dex/mir_graph.h
@@ -426,8 +426,8 @@
   }
 
   void EnableOpcodeCounting() {
-    opcode_count_ = static_cast<int*>(arena_->NewMem(kNumPackedOpcodes * sizeof(int), true,
-                                      ArenaAllocator::kAllocMisc));
+    opcode_count_ = static_cast<int*>(arena_->Alloc(kNumPackedOpcodes * sizeof(int),
+                                                    ArenaAllocator::kAllocMisc));
   }
 
   void ShowOpcodeStats();
diff --git a/compiler/dex/mir_optimization.cc b/compiler/dex/mir_optimization.cc
index 9f694de..b7611f8 100644
--- a/compiler/dex/mir_optimization.cc
+++ b/compiler/dex/mir_optimization.cc
@@ -94,8 +94,8 @@
 
 void MIRGraph::PropagateConstants() {
   is_constant_v_ = new (arena_) ArenaBitVector(arena_, GetNumSSARegs(), false);
-  constant_values_ = static_cast<int*>(arena_->NewMem(sizeof(int) * GetNumSSARegs(), true,
-                                                      ArenaAllocator::kAllocDFInfo));
+  constant_values_ = static_cast<int*>(arena_->Alloc(sizeof(int) * GetNumSSARegs(),
+                                                     ArenaAllocator::kAllocDFInfo));
   AllNodesIterator iter(this, false /* not iterative */);
   for (BasicBlock* bb = iter.Next(); bb != NULL; bb = iter.Next()) {
     DoConstantPropogation(bb);
@@ -399,8 +399,7 @@
                 DCHECK_EQ(SelectKind(if_true), kSelectMove);
                 DCHECK_EQ(SelectKind(if_false), kSelectMove);
                 int* src_ssa =
-                    static_cast<int*>(arena_->NewMem(sizeof(int) * 3, false,
-                                                     ArenaAllocator::kAllocDFInfo));
+                    static_cast<int*>(arena_->Alloc(sizeof(int) * 3, ArenaAllocator::kAllocDFInfo));
                 src_ssa[0] = mir->ssa_rep->uses[0];
                 src_ssa[1] = if_true->ssa_rep->uses[0];
                 src_ssa[2] = if_false->ssa_rep->uses[0];
@@ -409,16 +408,14 @@
               }
               mir->ssa_rep->num_defs = 1;
               mir->ssa_rep->defs =
-                  static_cast<int*>(arena_->NewMem(sizeof(int) * 1, false,
-                                                   ArenaAllocator::kAllocDFInfo));
+                  static_cast<int*>(arena_->Alloc(sizeof(int) * 1, ArenaAllocator::kAllocDFInfo));
               mir->ssa_rep->fp_def =
-                  static_cast<bool*>(arena_->NewMem(sizeof(bool) * 1, false,
-                                                    ArenaAllocator::kAllocDFInfo));
+                  static_cast<bool*>(arena_->Alloc(sizeof(bool) * 1, ArenaAllocator::kAllocDFInfo));
               mir->ssa_rep->fp_def[0] = if_true->ssa_rep->fp_def[0];
               // Match type of uses to def.
               mir->ssa_rep->fp_use =
-                  static_cast<bool*>(arena_->NewMem(sizeof(bool) * mir->ssa_rep->num_uses, false,
-                                                    ArenaAllocator::kAllocDFInfo));
+                  static_cast<bool*>(arena_->Alloc(sizeof(bool) * mir->ssa_rep->num_uses,
+                                                   ArenaAllocator::kAllocDFInfo));
               for (int i = 0; i < mir->ssa_rep->num_uses; i++) {
                 mir->ssa_rep->fp_use[i] = mir->ssa_rep->fp_def[0];
               }
@@ -805,8 +802,7 @@
 
 void MIRGraph::DumpCheckStats() {
   Checkstats* stats =
-      static_cast<Checkstats*>(arena_->NewMem(sizeof(Checkstats), true,
-                                              ArenaAllocator::kAllocDFInfo));
+      static_cast<Checkstats*>(arena_->Alloc(sizeof(Checkstats), ArenaAllocator::kAllocDFInfo));
   checkstats_ = stats;
   AllNodesIterator iter(this, false /* not iterative */);
   for (BasicBlock* bb = iter.Next(); bb != NULL; bb = iter.Next()) {
diff --git a/compiler/dex/quick/arm/call_arm.cc b/compiler/dex/quick/arm/call_arm.cc
index 2d8e24f..2dbe5f5 100644
--- a/compiler/dex/quick/arm/call_arm.cc
+++ b/compiler/dex/quick/arm/call_arm.cc
@@ -316,13 +316,12 @@
   }
   // Add the table to the list - we'll process it later
   SwitchTable *tab_rec =
-      static_cast<SwitchTable*>(arena_->NewMem(sizeof(SwitchTable), true,
-                                               ArenaAllocator::kAllocData));
+      static_cast<SwitchTable*>(arena_->Alloc(sizeof(SwitchTable), ArenaAllocator::kAllocData));
   tab_rec->table = table;
   tab_rec->vaddr = current_dalvik_offset_;
   int size = table[1];
-  tab_rec->targets = static_cast<LIR**>(arena_->NewMem(size * sizeof(LIR*), true,
-                                                       ArenaAllocator::kAllocLIR));
+  tab_rec->targets = static_cast<LIR**>(arena_->Alloc(size * sizeof(LIR*),
+                                                      ArenaAllocator::kAllocLIR));
   switch_tables_.Insert(tab_rec);
 
   // Get the switch value
@@ -365,13 +364,12 @@
   }
   // Add the table to the list - we'll process it later
   SwitchTable *tab_rec =
-      static_cast<SwitchTable*>(arena_->NewMem(sizeof(SwitchTable), true,
-                                               ArenaAllocator::kAllocData));
+      static_cast<SwitchTable*>(arena_->Alloc(sizeof(SwitchTable),  ArenaAllocator::kAllocData));
   tab_rec->table = table;
   tab_rec->vaddr = current_dalvik_offset_;
   int size = table[1];
   tab_rec->targets =
-      static_cast<LIR**>(arena_->NewMem(size * sizeof(LIR*), true, ArenaAllocator::kAllocLIR));
+      static_cast<LIR**>(arena_->Alloc(size * sizeof(LIR*), ArenaAllocator::kAllocLIR));
   switch_tables_.Insert(tab_rec);
 
   // Get the switch value
@@ -419,8 +417,7 @@
   const uint16_t* table = cu_->insns + current_dalvik_offset_ + table_offset;
   // Add the table to the list - we'll process it later
   FillArrayData *tab_rec =
-      static_cast<FillArrayData*>(arena_->NewMem(sizeof(FillArrayData), true,
-                                                 ArenaAllocator::kAllocData));
+      static_cast<FillArrayData*>(arena_->Alloc(sizeof(FillArrayData), ArenaAllocator::kAllocData));
   tab_rec->table = table;
   tab_rec->vaddr = current_dalvik_offset_;
   uint16_t width = tab_rec->table[1];
diff --git a/compiler/dex/quick/arm/target_arm.cc b/compiler/dex/quick/arm/target_arm.cc
index 47d3d97..6cc3052 100644
--- a/compiler/dex/quick/arm/target_arm.cc
+++ b/compiler/dex/quick/arm/target_arm.cc
@@ -538,16 +538,14 @@
   int num_temps = sizeof(core_temps)/sizeof(*core_temps);
   int num_fp_regs = sizeof(FpRegs)/sizeof(*FpRegs);
   int num_fp_temps = sizeof(fp_temps)/sizeof(*fp_temps);
-  reg_pool_ = static_cast<RegisterPool*>(arena_->NewMem(sizeof(*reg_pool_), true,
-                                                        ArenaAllocator::kAllocRegAlloc));
+  reg_pool_ = static_cast<RegisterPool*>(arena_->Alloc(sizeof(*reg_pool_),
+                                                       ArenaAllocator::kAllocRegAlloc));
   reg_pool_->num_core_regs = num_regs;
   reg_pool_->core_regs = reinterpret_cast<RegisterInfo*>
-      (arena_->NewMem(num_regs * sizeof(*reg_pool_->core_regs), true,
-                     ArenaAllocator::kAllocRegAlloc));
+      (arena_->Alloc(num_regs * sizeof(*reg_pool_->core_regs), ArenaAllocator::kAllocRegAlloc));
   reg_pool_->num_fp_regs = num_fp_regs;
   reg_pool_->FPRegs = static_cast<RegisterInfo*>
-      (arena_->NewMem(num_fp_regs * sizeof(*reg_pool_->FPRegs), true,
-                      ArenaAllocator::kAllocRegAlloc));
+      (arena_->Alloc(num_fp_regs * sizeof(*reg_pool_->FPRegs), ArenaAllocator::kAllocRegAlloc));
   CompilerInitPool(reg_pool_->core_regs, core_regs, reg_pool_->num_core_regs);
   CompilerInitPool(reg_pool_->FPRegs, FpRegs, reg_pool_->num_fp_regs);
   // Keep special registers from being allocated
diff --git a/compiler/dex/quick/codegen_util.cc b/compiler/dex/quick/codegen_util.cc
index 5f6f3d5..d89f1ed 100644
--- a/compiler/dex/quick/codegen_util.cc
+++ b/compiler/dex/quick/codegen_util.cc
@@ -321,7 +321,7 @@
 LIR* Mir2Lir::AddWordData(LIR* *constant_list_p, int value) {
   /* Add the constant to the literal pool */
   if (constant_list_p) {
-    LIR* new_value = static_cast<LIR*>(arena_->NewMem(sizeof(LIR), true, ArenaAllocator::kAllocData));
+    LIR* new_value = static_cast<LIR*>(arena_->Alloc(sizeof(LIR), ArenaAllocator::kAllocData));
     new_value->operands[0] = value;
     new_value->next = *constant_list_p;
     *constant_list_p = new_value;
@@ -793,7 +793,7 @@
   if (it == boundary_map_.end()) {
     LOG(FATAL) << "Error: didn't find vaddr 0x" << std::hex << vaddr;
   }
-  LIR* new_label = static_cast<LIR*>(arena_->NewMem(sizeof(LIR), true, ArenaAllocator::kAllocLIR));
+  LIR* new_label = static_cast<LIR*>(arena_->Alloc(sizeof(LIR), ArenaAllocator::kAllocLIR));
   new_label->dalvik_offset = vaddr;
   new_label->opcode = kPseudoCaseLabel;
   new_label->operands[0] = keyVal;
@@ -961,8 +961,8 @@
       first_lir_insn_(NULL),
       last_lir_insn_(NULL) {
   promotion_map_ = static_cast<PromotionMap*>
-      (arena_->NewMem((cu_->num_dalvik_registers  + cu_->num_compiler_temps + 1) *
-                      sizeof(promotion_map_[0]), true, ArenaAllocator::kAllocRegAlloc));
+      (arena_->Alloc((cu_->num_dalvik_registers  + cu_->num_compiler_temps + 1) *
+                      sizeof(promotion_map_[0]), ArenaAllocator::kAllocRegAlloc));
 }
 
 void Mir2Lir::Materialize() {
diff --git a/compiler/dex/quick/local_optimizations.cc b/compiler/dex/quick/local_optimizations.cc
index 2e9c845..630e990 100644
--- a/compiler/dex/quick/local_optimizations.cc
+++ b/compiler/dex/quick/local_optimizations.cc
@@ -249,7 +249,7 @@
         /* Only sink store instructions */
         if (sink_distance && !is_this_lir_load) {
           LIR* new_store_lir =
-              static_cast<LIR*>(arena_->NewMem(sizeof(LIR), true, ArenaAllocator::kAllocLIR));
+              static_cast<LIR*>(arena_->Alloc(sizeof(LIR), ArenaAllocator::kAllocLIR));
           *new_store_lir = *this_lir;
           /*
            * Stop point found - insert *before* the check_lir
@@ -446,7 +446,7 @@
       if (slot >= 0) {
         LIR* cur_lir = prev_inst_list[slot];
         LIR* new_load_lir =
-          static_cast<LIR*>(arena_->NewMem(sizeof(LIR), true, ArenaAllocator::kAllocLIR));
+          static_cast<LIR*>(arena_->Alloc(sizeof(LIR), ArenaAllocator::kAllocLIR));
         *new_load_lir = *this_lir;
         /*
          * Insertion is guaranteed to succeed since check_lir
diff --git a/compiler/dex/quick/mips/call_mips.cc b/compiler/dex/quick/mips/call_mips.cc
index eaae0e1..d53c012 100644
--- a/compiler/dex/quick/mips/call_mips.cc
+++ b/compiler/dex/quick/mips/call_mips.cc
@@ -67,13 +67,12 @@
   }
   // Add the table to the list - we'll process it later
   SwitchTable *tab_rec =
-      static_cast<SwitchTable*>(arena_->NewMem(sizeof(SwitchTable), true,
-                                               ArenaAllocator::kAllocData));
+      static_cast<SwitchTable*>(arena_->Alloc(sizeof(SwitchTable), ArenaAllocator::kAllocData));
   tab_rec->table = table;
   tab_rec->vaddr = current_dalvik_offset_;
   int elements = table[1];
   tab_rec->targets =
-      static_cast<LIR**>(arena_->NewMem(elements * sizeof(LIR*), true, ArenaAllocator::kAllocLIR));
+      static_cast<LIR**>(arena_->Alloc(elements * sizeof(LIR*), ArenaAllocator::kAllocLIR));
   switch_tables_.Insert(tab_rec);
 
   // The table is composed of 8-byte key/disp pairs
@@ -147,12 +146,11 @@
   }
   // Add the table to the list - we'll process it later
   SwitchTable *tab_rec =
-      static_cast<SwitchTable*>(arena_->NewMem(sizeof(SwitchTable), true,
-                                               ArenaAllocator::kAllocData));
+      static_cast<SwitchTable*>(arena_->Alloc(sizeof(SwitchTable), ArenaAllocator::kAllocData));
   tab_rec->table = table;
   tab_rec->vaddr = current_dalvik_offset_;
   int size = table[1];
-  tab_rec->targets = static_cast<LIR**>(arena_->NewMem(size * sizeof(LIR*), true,
+  tab_rec->targets = static_cast<LIR**>(arena_->Alloc(size * sizeof(LIR*),
                                                        ArenaAllocator::kAllocLIR));
   switch_tables_.Insert(tab_rec);
 
@@ -228,8 +226,8 @@
   const uint16_t* table = cu_->insns + current_dalvik_offset_ + table_offset;
   // Add the table to the list - we'll process it later
   FillArrayData *tab_rec =
-      reinterpret_cast<FillArrayData*>(arena_->NewMem(sizeof(FillArrayData), true,
-                                                      ArenaAllocator::kAllocData));
+      reinterpret_cast<FillArrayData*>(arena_->Alloc(sizeof(FillArrayData),
+                                                     ArenaAllocator::kAllocData));
   tab_rec->table = table;
   tab_rec->vaddr = current_dalvik_offset_;
   uint16_t width = tab_rec->table[1];
diff --git a/compiler/dex/quick/mips/target_mips.cc b/compiler/dex/quick/mips/target_mips.cc
index 7a9e91a..4ee5b23 100644
--- a/compiler/dex/quick/mips/target_mips.cc
+++ b/compiler/dex/quick/mips/target_mips.cc
@@ -462,16 +462,14 @@
   int num_temps = sizeof(core_temps)/sizeof(*core_temps);
   int num_fp_regs = sizeof(FpRegs)/sizeof(*FpRegs);
   int num_fp_temps = sizeof(fp_temps)/sizeof(*fp_temps);
-  reg_pool_ = static_cast<RegisterPool*>(arena_->NewMem(sizeof(*reg_pool_), true,
-                                                        ArenaAllocator::kAllocRegAlloc));
+  reg_pool_ = static_cast<RegisterPool*>(arena_->Alloc(sizeof(*reg_pool_),
+                                                       ArenaAllocator::kAllocRegAlloc));
   reg_pool_->num_core_regs = num_regs;
   reg_pool_->core_regs = static_cast<RegisterInfo*>
-     (arena_->NewMem(num_regs * sizeof(*reg_pool_->core_regs), true,
-                     ArenaAllocator::kAllocRegAlloc));
+     (arena_->Alloc(num_regs * sizeof(*reg_pool_->core_regs), ArenaAllocator::kAllocRegAlloc));
   reg_pool_->num_fp_regs = num_fp_regs;
   reg_pool_->FPRegs = static_cast<RegisterInfo*>
-      (arena_->NewMem(num_fp_regs * sizeof(*reg_pool_->FPRegs), true,
-                      ArenaAllocator::kAllocRegAlloc));
+      (arena_->Alloc(num_fp_regs * sizeof(*reg_pool_->FPRegs), ArenaAllocator::kAllocRegAlloc));
   CompilerInitPool(reg_pool_->core_regs, core_regs, reg_pool_->num_core_regs);
   CompilerInitPool(reg_pool_->FPRegs, FpRegs, reg_pool_->num_fp_regs);
   // Keep special registers from being allocated
diff --git a/compiler/dex/quick/mir_to_lir-inl.h b/compiler/dex/quick/mir_to_lir-inl.h
index d9aef5d..440df2a 100644
--- a/compiler/dex/quick/mir_to_lir-inl.h
+++ b/compiler/dex/quick/mir_to_lir-inl.h
@@ -40,7 +40,7 @@
 
 inline LIR* Mir2Lir::RawLIR(int dalvik_offset, int opcode, int op0,
                             int op1, int op2, int op3, int op4, LIR* target) {
-  LIR* insn = static_cast<LIR*>(arena_->NewMem(sizeof(LIR), true, ArenaAllocator::kAllocLIR));
+  LIR* insn = static_cast<LIR*>(arena_->Alloc(sizeof(LIR), ArenaAllocator::kAllocLIR));
   insn->dalvik_offset = dalvik_offset;
   insn->opcode = opcode;
   insn->operands[0] = op0;
diff --git a/compiler/dex/quick/mir_to_lir.cc b/compiler/dex/quick/mir_to_lir.cc
index 862c1d7..c41feb1 100644
--- a/compiler/dex/quick/mir_to_lir.cc
+++ b/compiler/dex/quick/mir_to_lir.cc
@@ -812,8 +812,8 @@
 void Mir2Lir::MethodMIR2LIR() {
   // Hold the labels of each block.
   block_label_list_ =
-      static_cast<LIR*>(arena_->NewMem(sizeof(LIR) * mir_graph_->GetNumBlocks(), true,
-                                       ArenaAllocator::kAllocLIR));
+      static_cast<LIR*>(arena_->Alloc(sizeof(LIR) * mir_graph_->GetNumBlocks(),
+                                      ArenaAllocator::kAllocLIR));
 
   PreOrderDfsIterator iter(mir_graph_, false /* not iterative */);
   for (BasicBlock* bb = iter.Next(); bb != NULL; bb = iter.Next()) {
diff --git a/compiler/dex/quick/ralloc_util.cc b/compiler/dex/quick/ralloc_util.cc
index a0b98dd..71b74a4 100644
--- a/compiler/dex/quick/ralloc_util.cc
+++ b/compiler/dex/quick/ralloc_util.cc
@@ -971,11 +971,11 @@
    * to describe register live ranges for GC.
    */
   RefCounts *core_regs =
-      static_cast<RefCounts*>(arena_->NewMem(sizeof(RefCounts) * num_regs, true,
-                                             ArenaAllocator::kAllocRegAlloc));
+      static_cast<RefCounts*>(arena_->Alloc(sizeof(RefCounts) * num_regs,
+                                            ArenaAllocator::kAllocRegAlloc));
   RefCounts *FpRegs =
-      static_cast<RefCounts *>(arena_->NewMem(sizeof(RefCounts) * num_regs, true,
-                                              ArenaAllocator::kAllocRegAlloc));
+      static_cast<RefCounts *>(arena_->Alloc(sizeof(RefCounts) * num_regs,
+                                             ArenaAllocator::kAllocRegAlloc));
   // Set ssa names for original Dalvik registers
   for (int i = 0; i < dalvik_regs; i++) {
     core_regs[i].s_reg = FpRegs[i].s_reg = i;
diff --git a/compiler/dex/quick/x86/call_x86.cc b/compiler/dex/quick/x86/call_x86.cc
index 6e3e55f..2be2aa9 100644
--- a/compiler/dex/quick/x86/call_x86.cc
+++ b/compiler/dex/quick/x86/call_x86.cc
@@ -74,13 +74,12 @@
   }
   // Add the table to the list - we'll process it later
   SwitchTable *tab_rec =
-      static_cast<SwitchTable *>(arena_->NewMem(sizeof(SwitchTable), true,
-                                                ArenaAllocator::kAllocData));
+      static_cast<SwitchTable *>(arena_->Alloc(sizeof(SwitchTable), ArenaAllocator::kAllocData));
   tab_rec->table = table;
   tab_rec->vaddr = current_dalvik_offset_;
   int size = table[1];
-  tab_rec->targets = static_cast<LIR**>(arena_->NewMem(size * sizeof(LIR*), true,
-                                                       ArenaAllocator::kAllocLIR));
+  tab_rec->targets = static_cast<LIR**>(arena_->Alloc(size * sizeof(LIR*),
+                                                      ArenaAllocator::kAllocLIR));
   switch_tables_.Insert(tab_rec);
 
   // Get the switch value
@@ -131,8 +130,7 @@
   const uint16_t* table = cu_->insns + current_dalvik_offset_ + table_offset;
   // Add the table to the list - we'll process it later
   FillArrayData *tab_rec =
-      static_cast<FillArrayData*>(arena_->NewMem(sizeof(FillArrayData), true,
-                                                 ArenaAllocator::kAllocData));
+      static_cast<FillArrayData*>(arena_->Alloc(sizeof(FillArrayData), ArenaAllocator::kAllocData));
   tab_rec->table = table;
   tab_rec->vaddr = current_dalvik_offset_;
   uint16_t width = tab_rec->table[1];
diff --git a/compiler/dex/quick/x86/target_x86.cc b/compiler/dex/quick/x86/target_x86.cc
index 699f3ae..26accab 100644
--- a/compiler/dex/quick/x86/target_x86.cc
+++ b/compiler/dex/quick/x86/target_x86.cc
@@ -438,16 +438,16 @@
   int num_temps = sizeof(core_temps)/sizeof(*core_temps);
   int num_fp_regs = sizeof(FpRegs)/sizeof(*FpRegs);
   int num_fp_temps = sizeof(fp_temps)/sizeof(*fp_temps);
-  reg_pool_ = static_cast<RegisterPool*>(arena_->NewMem(sizeof(*reg_pool_), true,
-                                                        ArenaAllocator::kAllocRegAlloc));
+  reg_pool_ = static_cast<RegisterPool*>(arena_->Alloc(sizeof(*reg_pool_),
+                                                       ArenaAllocator::kAllocRegAlloc));
   reg_pool_->num_core_regs = num_regs;
   reg_pool_->core_regs =
-      static_cast<RegisterInfo*>(arena_->NewMem(num_regs * sizeof(*reg_pool_->core_regs), true,
-                                                ArenaAllocator::kAllocRegAlloc));
+      static_cast<RegisterInfo*>(arena_->Alloc(num_regs * sizeof(*reg_pool_->core_regs),
+                                               ArenaAllocator::kAllocRegAlloc));
   reg_pool_->num_fp_regs = num_fp_regs;
   reg_pool_->FPRegs =
-      static_cast<RegisterInfo *>(arena_->NewMem(num_fp_regs * sizeof(*reg_pool_->FPRegs), true,
-                                                 ArenaAllocator::kAllocRegAlloc));
+      static_cast<RegisterInfo *>(arena_->Alloc(num_fp_regs * sizeof(*reg_pool_->FPRegs),
+                                                ArenaAllocator::kAllocRegAlloc));
   CompilerInitPool(reg_pool_->core_regs, core_regs, reg_pool_->num_core_regs);
   CompilerInitPool(reg_pool_->FPRegs, FpRegs, reg_pool_->num_fp_regs);
   // Keep special registers from being allocated
diff --git a/compiler/dex/ssa_transformation.cc b/compiler/dex/ssa_transformation.cc
index 18d8e93..cd1602f 100644
--- a/compiler/dex/ssa_transformation.cc
+++ b/compiler/dex/ssa_transformation.cc
@@ -136,8 +136,8 @@
   int num_registers = cu_->num_dalvik_registers;
   /* Allocate num_dalvik_registers bit vector pointers */
   def_block_matrix_ = static_cast<ArenaBitVector**>
-      (arena_->NewMem(sizeof(ArenaBitVector *) * num_registers, true,
-                      ArenaAllocator::kAllocDFInfo));
+      (arena_->Alloc(sizeof(ArenaBitVector *) * num_registers,
+                     ArenaAllocator::kAllocDFInfo));
   int i;
 
   /* Initialize num_register vectors with num_blocks bits each */
@@ -384,8 +384,8 @@
 
   /* Initalize & Clear i_dom_list */
   if (i_dom_list_ == NULL) {
-    i_dom_list_ = static_cast<int*>(arena_->NewMem(sizeof(int) * num_reachable_blocks, false,
-                                                   ArenaAllocator::kAllocDFInfo));
+    i_dom_list_ = static_cast<int*>(arena_->Alloc(sizeof(int) * num_reachable_blocks,
+                                                  ArenaAllocator::kAllocDFInfo));
   }
   for (int i = 0; i < num_reachable_blocks; i++) {
     i_dom_list_[i] = NOTVISITED;
@@ -564,7 +564,7 @@
         continue;
       }
       MIR *phi =
-          static_cast<MIR*>(arena_->NewMem(sizeof(MIR), true, ArenaAllocator::kAllocDFInfo));
+          static_cast<MIR*>(arena_->Alloc(sizeof(MIR), ArenaAllocator::kAllocDFInfo));
       phi->dalvikInsn.opcode = static_cast<Instruction::Code>(kMirOpPhi);
       phi->dalvikInsn.vA = dalvik_reg;
       phi->offset = phi_bb->start_offset;
@@ -610,14 +610,11 @@
     int num_uses = uses.size();
     mir->ssa_rep->num_uses = num_uses;
     mir->ssa_rep->uses =
-        static_cast<int*>(arena_->NewMem(sizeof(int) * num_uses, false,
-                                         ArenaAllocator::kAllocDFInfo));
+        static_cast<int*>(arena_->Alloc(sizeof(int) * num_uses, ArenaAllocator::kAllocDFInfo));
     mir->ssa_rep->fp_use =
-        static_cast<bool*>(arena_->NewMem(sizeof(bool) * num_uses, true,
-                                          ArenaAllocator::kAllocDFInfo));
+        static_cast<bool*>(arena_->Alloc(sizeof(bool) * num_uses, ArenaAllocator::kAllocDFInfo));
     int* incoming =
-        static_cast<int*>(arena_->NewMem(sizeof(int) * num_uses, false,
-                                         ArenaAllocator::kAllocDFInfo));
+        static_cast<int*>(arena_->Alloc(sizeof(int) * num_uses, ArenaAllocator::kAllocDFInfo));
     // TODO: Ugly, rework (but don't burden each MIR/LIR for Phi-only needs)
     mir->dalvikInsn.vB = reinterpret_cast<uintptr_t>(incoming);
 
@@ -644,7 +641,7 @@
 
   /* Save SSA map snapshot */
   int* saved_ssa_map =
-      static_cast<int*>(arena_->NewMem(map_size, false, ArenaAllocator::kAllocDalvikToSSAMap));
+      static_cast<int*>(arena_->Alloc(map_size, ArenaAllocator::kAllocDalvikToSSAMap));
   memcpy(saved_ssa_map, vreg_to_ssa_map_, map_size);
 
   if (block->fall_through) {
diff --git a/compiler/dex/vreg_analysis.cc b/compiler/dex/vreg_analysis.cc
index 5ee6753..07f37bb 100644
--- a/compiler/dex/vreg_analysis.cc
+++ b/compiler/dex/vreg_analysis.cc
@@ -374,8 +374,8 @@
  */
 void MIRGraph::BuildRegLocations() {
   /* Allocate the location map */
-  RegLocation* loc = static_cast<RegLocation*>(arena_->NewMem(GetNumSSARegs() * sizeof(*loc), true,
-                                                              ArenaAllocator::kAllocRegAlloc));
+  RegLocation* loc = static_cast<RegLocation*>(arena_->Alloc(GetNumSSARegs() * sizeof(*loc),
+                                                             ArenaAllocator::kAllocRegAlloc));
   for (int i = 0; i < GetNumSSARegs(); i++) {
     loc[i] = fresh_loc;
     loc[i].s_reg_low = i;
diff --git a/compiler/driver/compiler_driver.h b/compiler/driver/compiler_driver.h
index 22a510b..fa1b8f9 100644
--- a/compiler/driver/compiler_driver.h
+++ b/compiler/driver/compiler_driver.h
@@ -26,6 +26,7 @@
 #include "compiled_class.h"
 #include "compiled_method.h"
 #include "dex_file.h"
+#include "dex/arena_allocator.h"
 #include "instruction_set.h"
 #include "invoke_type.h"
 #include "method_reference.h"
@@ -213,6 +214,9 @@
     support_boot_image_fixup_ = support_boot_image_fixup;
   }
 
+  ArenaPool& GetArenaPool() {
+    return arena_pool_;
+  }
 
   bool WriteElf(const std::string& android_root,
                 bool is_host,
@@ -423,6 +427,9 @@
 
   pthread_key_t tls_key_;
 
+  // Arena pool used by the compiler.
+  ArenaPool arena_pool_;
+
   typedef void (*CompilerEnableAutoElfLoadingFn)(CompilerDriver& driver);
   CompilerEnableAutoElfLoadingFn compiler_enable_auto_elf_loading_;
 
diff --git a/compiler/elf_writer_quick.cc b/compiler/elf_writer_quick.cc
index 014c51e..f07609e 100644
--- a/compiler/elf_writer_quick.cc
+++ b/compiler/elf_writer_quick.cc
@@ -595,7 +595,7 @@
                 << " for " << elf_file_->GetPath();
     return false;
   }
-  if (!elf_file_->WriteFully(&dynstr[0], dynsym_size)) {
+  if (!elf_file_->WriteFully(&dynstr[0], dynstr_size)) {
     PLOG(ERROR) << "Failed to write .dynsym for " << elf_file_->GetPath();
     return false;
   }