[WebAssembly] Initial WebAssembly backend

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

llvm-svn: 241022

5 files changed, 123 insertions, 0 deletions

diff --git a/llvm/lib/Target/WebAssembly/InstPrinter/CMakeLists.txt b/llvm/lib/Target/WebAssembly/InstPrinter/CMakeLists.txt
new file mode 100644
index 00000000000..5394b67d2b8
--- /dev/null
+++ b/llvm/lib/Target/WebAssembly/InstPrinter/CMakeLists.txt
@@ -0,0 +1,3 @@
+add_llvm_library(LLVMWebAssemblyAsmPrinter
+  WebAssemblyInstPrinter.cpp
+  )
diff --git a/llvm/lib/Target/WebAssembly/InstPrinter/LLVMBuild.txt b/llvm/lib/Target/WebAssembly/InstPrinter/LLVMBuild.txt
new file mode 100644
index 00000000000..54df6d65570
--- /dev/null
+++ b/llvm/lib/Target/WebAssembly/InstPrinter/LLVMBuild.txt
@@ -0,0 +1,23 @@
+;===- ./lib/Target/WebAssembly/InstPrinter/LLVMBuild.txt -------*- Conf -*--===;
+;
+;                     The LLVM Compiler Infrastructure
+;
+; This file is distributed under the University of Illinois Open Source
+; License. See LICENSE.TXT for details.
+;
+;===------------------------------------------------------------------------===;
+;
+; This is an LLVMBuild description file for the components in this subdirectory.
+;
+; For more information on the LLVMBuild system, please see:
+;
+;   http://llvm.org/docs/LLVMBuild.html
+;
+;===------------------------------------------------------------------------===;
+
+[component_0]
+type = Library
+name = WebAssemblyAsmPrinter
+parent = WebAssembly
+required_libraries = MC Support
+add_to_library_groups = WebAssembly
diff --git a/llvm/lib/Target/WebAssembly/InstPrinter/Makefile b/llvm/lib/Target/WebAssembly/InstPrinter/Makefile
new file mode 100644
index 00000000000..87534379f79
--- /dev/null
+++ b/llvm/lib/Target/WebAssembly/InstPrinter/Makefile
@@ -0,0 +1,16 @@
+##===- lib/Target/WebAssembly/AsmPrinter/Makefile ----------*- Makefile -*-===##
+#
+#                     The LLVM Compiler Infrastructure
+#
+# This file is distributed under the University of Illinois Open Source
+# License. See LICENSE.TXT for details.
+#
+##===----------------------------------------------------------------------===##
+
+LEVEL = ../../../..
+LIBRARYNAME = LLVMWebAssemblyAsmPrinter
+
+# Hack: we need to include 'main' wasm target directory to grab private headers
+CPP.Flags += -I$(PROJ_OBJ_DIR)/.. -I$(PROJ_SRC_DIR)/..
+
+include $(LEVEL)/Makefile.common
diff --git a/llvm/lib/Target/WebAssembly/InstPrinter/WebAssemblyInstPrinter.cpp b/llvm/lib/Target/WebAssembly/InstPrinter/WebAssemblyInstPrinter.cpp
new file mode 100644
index 00000000000..fbb985aaafb
--- /dev/null
+++ b/llvm/lib/Target/WebAssembly/InstPrinter/WebAssemblyInstPrinter.cpp
@@ -0,0 +1,43 @@
+//=- WebAssemblyInstPrinter.cpp - WebAssembly assembly instruction printing -=//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// \brief Print MCInst instructions to wasm format.
+///
+//===----------------------------------------------------------------------===//
+
+#include "InstPrinter/WebAssemblyInstPrinter.h"
+#include "WebAssembly.h"
+#include "llvm/MC/MCExpr.h"
+#include "llvm/MC/MCInst.h"
+#include "llvm/MC/MCInstrInfo.h"
+#include "llvm/MC/MCSubtargetInfo.h"
+#include "llvm/MC/MCSymbol.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/FormattedStream.h"
+#include <cctype>
+using namespace llvm;
+
+#define DEBUG_TYPE "asm-printer"
+
+WebAssemblyInstPrinter::WebAssemblyInstPrinter(const MCAsmInfo &MAI,
+                                               const MCInstrInfo &MII,
+                                               const MCRegisterInfo &MRI)
+    : MCInstPrinter(MAI, MII, MRI) {}
+
+void WebAssemblyInstPrinter::printRegName(raw_ostream &OS,
+                                          unsigned RegNo) const {
+  llvm_unreachable("TODO: implement printRegName");
+}
+
+void WebAssemblyInstPrinter::printInst(const MCInst *MI, raw_ostream &OS,
+                                       StringRef Annot,
+                                       const MCSubtargetInfo &STI) {
+  llvm_unreachable("TODO: implement printInst");
+}
diff --git a/llvm/lib/Target/WebAssembly/InstPrinter/WebAssemblyInstPrinter.h b/llvm/lib/Target/WebAssembly/InstPrinter/WebAssemblyInstPrinter.h
new file mode 100644
index 00000000000..70fcef214ce
--- /dev/null
+++ b/llvm/lib/Target/WebAssembly/InstPrinter/WebAssemblyInstPrinter.h
@@ -0,0 +1,38 @@
+// WebAssemblyInstPrinter.h - Print wasm MCInst to assembly syntax -*- 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 class prints an WebAssembly MCInst to wasm file syntax.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_TARGET_WEBASSEMBLY_INSTPRINTER_WEBASSEMBLYINSTPRINTER_H
+#define LLVM_LIB_TARGET_WEBASSEMBLY_INSTPRINTER_WEBASSEMBLYINSTPRINTER_H
+
+#include "llvm/MC/MCInstPrinter.h"
+#include "llvm/Support/raw_ostream.h"
+
+namespace llvm {
+
+class MCOperand;
+class MCSubtargetInfo;
+
+class WebAssemblyInstPrinter : public MCInstPrinter {
+public:
+  WebAssemblyInstPrinter(const MCAsmInfo &MAI, const MCInstrInfo &MII,
+                         const MCRegisterInfo &MRI);
+
+  void printRegName(raw_ostream &OS, unsigned RegNo) const override;
+  void printInst(const MCInst *MI, raw_ostream &OS, StringRef Annot,
+                 const MCSubtargetInfo &STI) override;
+};
+
+} // end namespace llvm
+
+#endif