[WebAssembly] Initial WebAssembly backend

This WebAssembly backend is just a skeleton at this time and is not yet
functional.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@241022 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/WebAssembly/WebAssemblyMachineFunctionInfo.h

@@ -0,0 +1,37 @@
+// WebAssemblyMachineFuctionInfo.h-WebAssembly machine function info -*- C++ -*-
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// \brief This file declares WebAssembly-specific per-machine-function
+/// information.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYMACHINEFUNCTIONINFO_H
+#define LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYMACHINEFUNCTIONINFO_H
+
+#include "WebAssemblyRegisterInfo.h"
+#include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/CodeGen/MachineRegisterInfo.h"
+
+namespace llvm {
+
+/// This class is derived from MachineFunctionInfo and contains private
+/// WebAssembly-specific information for each MachineFunction.
+class WebAssemblyFunctionInfo final : public MachineFunctionInfo {
+  MachineFunction &MF;
+
+public:
+  explicit WebAssemblyFunctionInfo(MachineFunction &MF) : MF(MF) {}
+  ~WebAssemblyFunctionInfo() override;
+};
+
+} // end namespace llvm
+
+#endif