[WebAssembly] Add an option to make get_local/set_local explicit.

This patch adds a pass, controlled by an option and off by default for
now, for making implicit get_local/set_local explicit. This simplifies
emitting wasm with MC.

Differential Revision: https://reviews.llvm.org/D25836

llvm-svn: 285009

1 files changed, 34 insertions, 0 deletions

diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyUtilities.h b/llvm/lib/Target/WebAssembly/WebAssemblyUtilities.h
new file mode 100644
index 00000000000..eb114403d14
--- /dev/null
+++ b/llvm/lib/Target/WebAssembly/WebAssemblyUtilities.h
@@ -0,0 +1,34 @@
+//===-- WebAssemblyUtilities - WebAssembly Utility Functions ---*- 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 contains the declaration of the WebAssembly-specific
+/// utility functions.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYUTILITIES_H
+#define LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYUTILITIES_H
+
+namespace llvm {
+
+class MachineInstr;
+class WebAssemblyFunctionInfo;
+
+namespace WebAssembly {
+
+bool isArgument(const MachineInstr &MI);
+bool isCopy(const MachineInstr &MI);
+bool isTee(const MachineInstr &MI);
+bool isChild(const MachineInstr &MI, const WebAssemblyFunctionInfo &MFI);
+
+} // end namespace WebAssembly
+} // end namespace llvm
+
+#endif