[RISCV] Add bare-bones RISC-V MCTargetDesc

This is enough to compile and link but doesn't yet do anything particularly 
useful. Once an ASM parser and printer are added in the next two patches, the 
whole thing can be usefully tested.

Differential Revision: https://reviews.llvm.org/D23562

llvm-svn: 285770

1 files changed, 59 insertions, 0 deletions

diff --git a/llvm/lib/Target/RISCV/MCTargetDesc/RISCVMCTargetDesc.cpp b/llvm/lib/Target/RISCV/MCTargetDesc/RISCVMCTargetDesc.cpp
new file mode 100644
index 00000000000..4fc69a7fcab
--- /dev/null
+++ b/llvm/lib/Target/RISCV/MCTargetDesc/RISCVMCTargetDesc.cpp
@@ -0,0 +1,59 @@
+//===-- RISCVMCTargetDesc.cpp - RISCV Target Descriptions -----------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+///
+/// This file provides RISCV-specific target descriptions.
+///
+//===----------------------------------------------------------------------===//
+
+#include "RISCVMCTargetDesc.h"
+#include "RISCVMCAsmInfo.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/MC/MCAsmInfo.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"
+
+#define GET_INSTRINFO_MC_DESC
+#include "RISCVGenInstrInfo.inc"
+
+#define GET_REGINFO_MC_DESC
+#include "RISCVGenRegisterInfo.inc"
+
+using namespace llvm;
+
+static MCInstrInfo *createRISCVMCInstrInfo() {
+  MCInstrInfo *X = new MCInstrInfo();
+  InitRISCVMCInstrInfo(X);
+  return X;
+}
+
+static MCRegisterInfo *createRISCVMCRegisterInfo(const Triple &TT) {
+  MCRegisterInfo *X = new MCRegisterInfo();
+  InitRISCVMCRegisterInfo(X, RISCV::X1_32);
+  return X;
+}
+
+static MCAsmInfo *createRISCVMCAsmInfo(const MCRegisterInfo &MRI,
+                                       const Triple &TT) {
+  MCAsmInfo *MAI = new RISCVMCAsmInfo(TT);
+  return MAI;
+}
+
+extern "C" void LLVMInitializeRISCVTargetMC() {
+  for (Target *T : {&getTheRISCV32Target(), &getTheRISCV64Target()}) {
+    RegisterMCAsmInfoFn X(*T, createRISCVMCAsmInfo);
+    TargetRegistry::RegisterMCInstrInfo(*T, createRISCVMCInstrInfo);
+    TargetRegistry::RegisterMCRegInfo(*T, createRISCVMCRegisterInfo);
+    TargetRegistry::RegisterMCAsmBackend(*T, createRISCVAsmBackend);
+    TargetRegistry::RegisterMCCodeEmitter(*T, createRISCVMCCodeEmitter);
+  }
+}