1 files changed, 117 insertions, 0 deletions
diff --git a/llvm/lib/Target/Nios2/Nios2MCInstLower.cpp b/llvm/lib/Target/Nios2/Nios2MCInstLower.cpp
new file mode 100644
index 00000000000..c43af879b8a
--- /dev/null
+++ b/llvm/lib/Target/Nios2/Nios2MCInstLower.cpp
@@ -0,0 +1,117 @@
+//===-- Nios2MCInstLower.cpp - Convert Nios2 MachineInstr to MCInst -------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains code to lower Nios2 MachineInstrs to their corresponding
+// MCInst records.
+//
+//===----------------------------------------------------------------------===//
+
+#include "MCTargetDesc/Nios2BaseInfo.h"
+#include "MCTargetDesc/Nios2MCExpr.h"
+#include "Nios2.h"
+#include "llvm/CodeGen/AsmPrinter.h"
+#include "llvm/CodeGen/MachineInstr.h"
+#include "llvm/CodeGen/MachineOperand.h"
+
+using namespace llvm;
+
+static MCOperand LowerSymbolOperand(const MachineOperand &MO, AsmPrinter &AP) {
+  MCSymbolRefExpr::VariantKind Kind = MCSymbolRefExpr::VK_None;
+  Nios2MCExpr::Nios2ExprKind TargetKind = Nios2MCExpr::CEK_None;
+  const MCSymbol *Symbol;
+
+  switch (MO.getTargetFlags()) {
+  default:
+    llvm_unreachable("Invalid target flag!");
+  case Nios2FG::MO_NO_FLAG:
+    break;
+  case Nios2FG::MO_ABS_HI:
+    TargetKind = Nios2MCExpr::CEK_ABS_HI;
+    break;
+  case Nios2FG::MO_ABS_LO:
+    TargetKind = Nios2MCExpr::CEK_ABS_LO;
+    break;
+  }
+
+  switch (MO.getType()) {
+  case MachineOperand::MO_GlobalAddress:
+    Symbol = AP.getSymbol(MO.getGlobal());
+    break;
+
+  case MachineOperand::MO_MachineBasicBlock:
+    Symbol = MO.getMBB()->getSymbol();
+    break;
+
+  case MachineOperand::MO_BlockAddress:
+    Symbol = AP.GetBlockAddressSymbol(MO.getBlockAddress());
+    break;
+
+  case MachineOperand::MO_ExternalSymbol:
+    Symbol = AP.GetExternalSymbolSymbol(MO.getSymbolName());
+    break;
+
+  case MachineOperand::MO_JumpTableIndex:
+    Symbol = AP.GetJTISymbol(MO.getIndex());
+    break;
+
+  case MachineOperand::MO_ConstantPoolIndex:
+    Symbol = AP.GetCPISymbol(MO.getIndex());
+    break;
+
+  default:
+    llvm_unreachable("<unknown operand type>");
+  }
+
+  const MCExpr *Expr = MCSymbolRefExpr::create(Symbol, Kind, AP.OutContext);
+
+  if (TargetKind != Nios2MCExpr::CEK_None)
+    Expr = Nios2MCExpr::create(TargetKind, Expr, AP.OutContext);
+
+  return MCOperand::createExpr(Expr);
+}
+
+static MCOperand LowerOperand(const MachineOperand &MO, AsmPrinter &AP) {
+
+  switch (MO.getType()) {
+  default:
+    llvm_unreachable("unknown operand type");
+  case MachineOperand::MO_Register:
+    // Ignore all implicit register operands.
+    if (MO.isImplicit())
+      break;
+    return MCOperand::createReg(MO.getReg());
+  case MachineOperand::MO_Immediate:
+    return MCOperand::createImm(MO.getImm());
+  case MachineOperand::MO_MachineBasicBlock:
+  case MachineOperand::MO_ExternalSymbol:
+  case MachineOperand::MO_JumpTableIndex:
+  case MachineOperand::MO_BlockAddress:
+  case MachineOperand::MO_GlobalAddress:
+  case MachineOperand::MO_ConstantPoolIndex:
+    return LowerSymbolOperand(MO, AP);
+  case MachineOperand::MO_RegisterMask:
+    break;
+  }
+
+  return MCOperand();
+}
+
+void llvm::LowerNios2MachineInstToMCInst(const MachineInstr *MI, MCInst &OutMI,
+                                         AsmPrinter &AP) {
+
+  OutMI.setOpcode(MI->getOpcode());
+
+  for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
+    const MachineOperand &MO = MI->getOperand(i);
+    MCOperand MCOp = LowerOperand(MO, AP);
+
+    if (MCOp.isValid())
+      OutMI.addOperand(MCOp);
+  }
+}