--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/llvm/tools/llvm-exegesis/lib/LlvmState.h	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,79 @@
+//===-- LlvmState.h ---------------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// A class to set up and access common LLVM objects.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_TOOLS_LLVM_EXEGESIS_LLVMSTATE_H
+#define LLVM_TOOLS_LLVM_EXEGESIS_LLVMSTATE_H
+
+#include "MCInstrDescView.h"
+#include "RegisterAliasing.h"
+#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/MC/MCInst.h"
+#include "llvm/MC/MCInstrInfo.h"
+#include "llvm/MC/MCRegisterInfo.h"
+#include "llvm/MC/MCSubtargetInfo.h"
+#include "llvm/Target/TargetMachine.h"
+#include <memory>
+#include <string>
+
+namespace llvm {
+namespace exegesis {
+
+class ExegesisTarget;
+struct PfmCountersInfo;
+
+// An object to initialize LLVM and prepare objects needed to run the
+// measurements.
+class LLVMState {
+public:
+  // Uses the host triple. If CpuName is empty, uses the host CPU.
+  LLVMState(const std::string &CpuName);
+
+  LLVMState(const std::string &Triple,
+            const std::string &CpuName,
+            const std::string &Features = ""); // For tests.
+
+  const TargetMachine &getTargetMachine() const { return *TheTargetMachine; }
+  std::unique_ptr<LLVMTargetMachine> createTargetMachine() const;
+
+  const ExegesisTarget &getExegesisTarget() const { return *TheExegesisTarget; }
+
+  bool canAssemble(const MCInst &mc_inst) const;
+
+  // For convenience:
+  const MCInstrInfo &getInstrInfo() const {
+    return *TheTargetMachine->getMCInstrInfo();
+  }
+  const MCRegisterInfo &getRegInfo() const {
+    return *TheTargetMachine->getMCRegisterInfo();
+  }
+  const MCSubtargetInfo &getSubtargetInfo() const {
+    return *TheTargetMachine->getMCSubtargetInfo();
+  }
+
+  const RegisterAliasingTrackerCache &getRATC() const { return *RATC; }
+  const InstructionsCache &getIC() const { return *IC; }
+
+  const PfmCountersInfo &getPfmCounters() const { return *PfmCounters; }
+
+private:
+  const ExegesisTarget *TheExegesisTarget;
+  std::unique_ptr<const TargetMachine> TheTargetMachine;
+  std::unique_ptr<const RegisterAliasingTrackerCache> RATC;
+  std::unique_ptr<const InstructionsCache> IC;
+  const PfmCountersInfo *PfmCounters;
+};
+
+} // namespace exegesis
+} // namespace llvm
+
+#endif // LLVM_TOOLS_LLVM_EXEGESIS_LLVMSTATE_H