diff --git a/llvm/tools/llvm-mca/CodeRegionGenerator.h b/llvm/tools/llvm-mca/CodeRegionGenerator.h
new file mode 100644
index 0000000..892cafb
--- /dev/null
+++ b/llvm/tools/llvm-mca/CodeRegionGenerator.h
@@ -0,0 +1,70 @@
+//===----------------------- CodeRegionGenerator.h --------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+/// \file
+///
+/// This file declares classes responsible for generating llvm-mca
+/// CodeRegions from various types of input. llvm-mca only analyzes CodeRegions,
+/// so the classes here provide the input-to-CodeRegions translation.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_TOOLS_LLVM_MCA_CODEREGION_GENERATOR_H
+#define LLVM_TOOLS_LLVM_MCA_CODEREGION_GENERATOR_H
+
+#include "CodeRegion.h"
+#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCSubtargetInfo.h"
+#include "llvm/Support/Error.h"
+#include "llvm/Support/SourceMgr.h"
+#include "llvm/Support/TargetRegistry.h"
+#include <memory>
+
+namespace llvm {
+namespace mca {
+
+/// This class is responsible for parsing the input given to the llvm-mca
+/// driver, and converting that into a CodeRegions instance.
+class CodeRegionGenerator {
+protected:
+  CodeRegions Regions;
+  CodeRegionGenerator(const CodeRegionGenerator &) = delete;
+  CodeRegionGenerator &operator=(const CodeRegionGenerator &) = delete;
+
+public:
+  CodeRegionGenerator(SourceMgr &SM) : Regions(SM) {}
+  virtual ~CodeRegionGenerator();
+  virtual Expected<const CodeRegions &> parseCodeRegions() = 0;
+};
+
+/// This class is responsible for parsing input ASM and generating
+/// a CodeRegions instance.
+class AsmCodeRegionGenerator final : public CodeRegionGenerator {
+  const Target &TheTarget;
+  MCContext &Ctx;
+  const MCAsmInfo &MAI;
+  const MCSubtargetInfo &STI;
+  const MCInstrInfo &MCII;
+  unsigned AssemblerDialect; // This is set during parsing.
+
+public:
+  AsmCodeRegionGenerator(const Target &T, SourceMgr &SM, MCContext &C,
+                         const MCAsmInfo &A, const MCSubtargetInfo &S,
+                         const MCInstrInfo &I)
+      : CodeRegionGenerator(SM), TheTarget(T), Ctx(C), MAI(A), STI(S), MCII(I),
+        AssemblerDialect(0) {}
+
+  unsigned getAssemblerDialect() const { return AssemblerDialect; }
+  Expected<const CodeRegions &> parseCodeRegions() override;
+};
+
+} // namespace mca
+} // namespace llvm
+
+#endif // LLVM_TOOLS_LLVM_MCA_CODEREGION_GENERATOR_H