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diff --git a/compiler/dex/compiler_ir.h b/compiler/dex/compiler_ir.h
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+++ b/compiler/dex/compiler_ir.h
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+/*
+ * Copyright (C) 2011 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ART_SRC_COMPILER_DEX_COMPILER_IR_H_
+#define ART_SRC_COMPILER_DEX_COMPILER_IR_H_
+
+#include <vector>
+#include <llvm/IR/Module.h>
+#include "arena_allocator.h"
+#include "backend.h"
+#include "compiler_enums.h"
+#include "dex/quick/mir_to_lir.h"
+#include "dex_instruction.h"
+#include "driver/compiler_driver.h"
+#include "driver/dex_compilation_unit.h"
+#include "llvm/intrinsic_helper.h"
+#include "llvm/ir_builder.h"
+#include "safe_map.h"
+
+namespace art {
+
+class LLVMInfo;
+namespace llvm {
+class LlvmCompilationUnit;
+}  // namespace llvm
+
+struct ArenaMemBlock;
+struct Memstats;
+class MIRGraph;
+class Mir2Lir;
+
+struct CompilationUnit {
+  CompilationUnit()
+    : compiler_driver(NULL),
+      class_linker(NULL),
+      dex_file(NULL),
+      class_loader(NULL),
+      class_def_idx(0),
+      method_idx(0),
+      code_item(NULL),
+      access_flags(0),
+      invoke_type(kDirect),
+      shorty(NULL),
+      disable_opt(0),
+      enable_debug(0),
+      verbose(false),
+      compiler_backend(kNoBackend),
+      instruction_set(kNone),
+      num_dalvik_registers(0),
+      insns(NULL),
+      num_ins(0),
+      num_outs(0),
+      num_regs(0),
+      num_compiler_temps(0),
+      compiler_flip_match(false),
+      mir_graph(NULL),
+      cg(NULL) {}
+  /*
+   * Fields needed/generated by common frontend and generally used throughout
+   * the compiler.
+  */
+  CompilerDriver* compiler_driver;
+  ClassLinker* class_linker;           // Linker to resolve fields and methods.
+  const DexFile* dex_file;             // DexFile containing the method being compiled.
+  jobject class_loader;                // compiling method's class loader.
+  uint32_t class_def_idx;              // compiling method's defining class definition index.
+  uint32_t method_idx;                 // compiling method's index into method_ids of DexFile.
+  const DexFile::CodeItem* code_item;  // compiling method's DexFile code_item.
+  uint32_t access_flags;               // compiling method's access flags.
+  InvokeType invoke_type;              // compiling method's invocation type.
+  const char* shorty;                  // compiling method's shorty.
+  uint32_t disable_opt;                // opt_control_vector flags.
+  uint32_t enable_debug;               // debugControlVector flags.
+  bool verbose;
+  CompilerBackend compiler_backend;
+  InstructionSet instruction_set;
+
+  // TODO: much of this info available elsewhere.  Go to the original source?
+  int num_dalvik_registers;        // method->registers_size.
+  const uint16_t* insns;
+  int num_ins;
+  int num_outs;
+  int num_regs;            // Unlike num_dalvik_registers, does not include ins.
+
+  // TODO: may want to move this to MIRGraph.
+  int num_compiler_temps;
+
+  // If non-empty, apply optimizer/debug flags only to matching methods.
+  std::string compiler_method_match;
+  // Flips sense of compiler_method_match - apply flags if doesn't match.
+  bool compiler_flip_match;
+
+  // TODO: move memory management to mir_graph, or just switch to using standard containers.
+  ArenaAllocator arena;
+
+  UniquePtr<MIRGraph> mir_graph;   // MIR container.
+  UniquePtr<Backend> cg;           // Target-specific codegen.
+};
+
+}  // namespace art
+
+#endif // ART_SRC_COMPILER_DEX_COMPILER_IR_H_