[RISCV] Add RISCVInstPrinter and basic MC assembler tests
With the addition of RISCVInstPrinter, it is now possible to test the basic
operation of the RISCV MC layer.
Differential Revision: https://reviews.llvm.org/D23564
llvm-svn: 310917
diff --git a/llvm/lib/Target/RISCV/InstPrinter/RISCVInstPrinter.cpp b/llvm/lib/Target/RISCV/InstPrinter/RISCVInstPrinter.cpp
new file mode 100644
index 0000000..23f3352c0
--- /dev/null
+++ b/llvm/lib/Target/RISCV/InstPrinter/RISCVInstPrinter.cpp
@@ -0,0 +1,55 @@
+//===-- RISCVInstPrinter.cpp - Convert RISCV MCInst to asm syntax ---------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This class prints an RISCV MCInst to a .s file.
+//
+//===----------------------------------------------------------------------===//
+
+#include "RISCVInstPrinter.h"
+#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/MC/MCExpr.h"
+#include "llvm/MC/MCInst.h"
+#include "llvm/MC/MCSymbol.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/FormattedStream.h"
+using namespace llvm;
+
+#define DEBUG_TYPE "asm-printer"
+
+// Include the auto-generated portion of the assembly writer.
+#include "RISCVGenAsmWriter.inc"
+
+void RISCVInstPrinter::printInst(const MCInst *MI, raw_ostream &O,
+ StringRef Annot, const MCSubtargetInfo &STI) {
+ printInstruction(MI, O);
+ printAnnotation(O, Annot);
+}
+
+void RISCVInstPrinter::printRegName(raw_ostream &O, unsigned RegNo) const {
+ O << getRegisterName(RegNo);
+}
+
+void RISCVInstPrinter::printOperand(const MCInst *MI, unsigned OpNo,
+ raw_ostream &O, const char *Modifier) {
+ assert((Modifier == 0 || Modifier[0] == 0) && "No modifiers supported");
+ const MCOperand &MO = MI->getOperand(OpNo);
+
+ if (MO.isReg()) {
+ printRegName(O, MO.getReg());
+ return;
+ }
+
+ if (MO.isImm()) {
+ O << MO.getImm();
+ return;
+ }
+
+ assert(MO.isExpr() && "Unknown operand kind in printOperand");
+ MO.getExpr()->print(O, &MAI);
+}