[WebAssembly] Initial WebAssembly backend

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

llvm-svn: 241022

1 files changed, 56 insertions, 0 deletions

diff --git a/llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyMCTargetDesc.cpp b/llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyMCTargetDesc.cpp
new file mode 100644
index 00000000000..f74d2e85392
--- /dev/null
+++ b/llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyMCTargetDesc.cpp
@@ -0,0 +1,56 @@
+//===-- WebAssemblyMCTargetDesc.cpp - WebAssembly Target Descriptions -----===//
+//
+//                     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 provides WebAssembly-specific target descriptions.
+///
+//===----------------------------------------------------------------------===//
+
+#include "WebAssemblyMCTargetDesc.h"
+#include "InstPrinter/WebAssemblyInstPrinter.h"
+#include "WebAssemblyMCAsmInfo.h"
+#include "llvm/MC/MCCodeGenInfo.h"
+#include "llvm/MC/MCInstrInfo.h"
+#include "llvm/MC/MCRegisterInfo.h"
+#include "llvm/MC/MCStreamer.h"
+#include "llvm/MC/MCSubtargetInfo.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/TargetRegistry.h"
+using namespace llvm;
+
+#define DEBUG_TYPE "wasm-mc-target-desc"
+
+#define GET_SUBTARGETINFO_MC_DESC
+#include "WebAssemblyGenSubtargetInfo.inc"
+
+static MCAsmInfo *createWebAssemblyMCAsmInfo(const MCRegisterInfo &MRI,
+                                             const Triple &TT) {
+  MCAsmInfo *MAI = new WebAssemblyMCAsmInfo(TT);
+  return MAI;
+}
+
+static MCInstPrinter *
+createWebAssemblyMCInstPrinter(const Triple &T, unsigned SyntaxVariant,
+                               const MCAsmInfo &MAI, const MCInstrInfo &MII,
+                               const MCRegisterInfo &MRI) {
+  if (SyntaxVariant == 0 || SyntaxVariant == 1)
+    return new WebAssemblyInstPrinter(MAI, MII, MRI);
+  return nullptr;
+}
+
+// Force static initialization.
+extern "C" void LLVMInitializeWebAssemblyTargetMC() {
+  for (Target *T : {&TheWebAssemblyTarget}) {
+    // Register the MC asm info.
+    RegisterMCAsmInfoFn X(*T, createWebAssemblyMCAsmInfo);
+
+    // Register the MCInstPrinter.
+    TargetRegistry::RegisterMCInstPrinter(*T, createWebAssemblyMCInstPrinter);
+  }
+}