1 files changed, 140 insertions, 0 deletions
diff --git a/lib/Target/Lanai/LanaiMCInstLower.cpp b/lib/Target/Lanai/LanaiMCInstLower.cpp
new file mode 100644
index 0000000000000..6c809b43f7ed5
--- /dev/null
+++ b/lib/Target/Lanai/LanaiMCInstLower.cpp
@@ -0,0 +1,140 @@
+//=-- LanaiMCInstLower.cpp - Convert Lanai MachineInstr to an 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 Lanai MachineInstrs to their corresponding
+// MCInst records.
+//
+//===----------------------------------------------------------------------===//
+
+#include "LanaiMCInstLower.h"
+
+#include "MCTargetDesc/LanaiBaseInfo.h"
+#include "MCTargetDesc/LanaiMCExpr.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/CodeGen/AsmPrinter.h"
+#include "llvm/CodeGen/MachineBasicBlock.h"
+#include "llvm/CodeGen/MachineInstr.h"
+#include "llvm/IR/Constants.h"
+#include "llvm/IR/Mangler.h"
+#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCExpr.h"
+#include "llvm/MC/MCInst.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/raw_ostream.h"
+
+using namespace llvm;
+
+MCSymbol *
+LanaiMCInstLower::GetGlobalAddressSymbol(const MachineOperand &MO) const {
+  return Printer.getSymbol(MO.getGlobal());
+}
+
+MCSymbol *
+LanaiMCInstLower::GetBlockAddressSymbol(const MachineOperand &MO) const {
+  return Printer.GetBlockAddressSymbol(MO.getBlockAddress());
+}
+
+MCSymbol *
+LanaiMCInstLower::GetExternalSymbolSymbol(const MachineOperand &MO) const {
+  return Printer.GetExternalSymbolSymbol(MO.getSymbolName());
+}
+
+MCSymbol *LanaiMCInstLower::GetJumpTableSymbol(const MachineOperand &MO) const {
+  SmallString<256> Name;
+  raw_svector_ostream(Name) << Printer.MAI->getPrivateGlobalPrefix() << "JTI"
+                            << Printer.getFunctionNumber() << '_'
+                            << MO.getIndex();
+  // Create a symbol for the name.
+  return Ctx.getOrCreateSymbol(Name.str());
+}
+
+MCSymbol *
+LanaiMCInstLower::GetConstantPoolIndexSymbol(const MachineOperand &MO) const {
+  SmallString<256> Name;
+  raw_svector_ostream(Name) << Printer.MAI->getPrivateGlobalPrefix() << "CPI"
+                            << Printer.getFunctionNumber() << '_'
+                            << MO.getIndex();
+  // Create a symbol for the name.
+  return Ctx.getOrCreateSymbol(Name.str());
+}
+
+MCOperand LanaiMCInstLower::LowerSymbolOperand(const MachineOperand &MO,
+                                               MCSymbol *Sym) const {
+  LanaiMCExpr::VariantKind Kind;
+
+  switch (MO.getTargetFlags()) {
+  case LanaiII::MO_NO_FLAG:
+    Kind = LanaiMCExpr::VK_Lanai_None;
+    break;
+  case LanaiII::MO_ABS_HI:
+    Kind = LanaiMCExpr::VK_Lanai_ABS_HI;
+    break;
+  case LanaiII::MO_ABS_LO:
+    Kind = LanaiMCExpr::VK_Lanai_ABS_LO;
+    break;
+  default:
+    llvm_unreachable("Unknown target flag on GV operand");
+  }
+
+  const MCExpr *Expr =
+      MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_None, Ctx);
+  if (!MO.isJTI() && MO.getOffset())
+    Expr = MCBinaryExpr::createAdd(
+        Expr, MCConstantExpr::create(MO.getOffset(), Ctx), Ctx);
+  Expr = LanaiMCExpr::create(Kind, Expr, Ctx);
+  return MCOperand::createExpr(Expr);
+}
+
+void LanaiMCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const {
+  OutMI.setOpcode(MI->getOpcode());
+
+  for (unsigned I = 0, E = MI->getNumOperands(); I != E; ++I) {
+    const MachineOperand &MO = MI->getOperand(I);
+
+    MCOperand MCOp;
+    switch (MO.getType()) {
+    case MachineOperand::MO_Register:
+      // Ignore all implicit register operands.
+      if (MO.isImplicit())
+        continue;
+      MCOp = MCOperand::createReg(MO.getReg());
+      break;
+    case MachineOperand::MO_Immediate:
+      MCOp = MCOperand::createImm(MO.getImm());
+      break;
+    case MachineOperand::MO_MachineBasicBlock:
+      MCOp = MCOperand::createExpr(
+          MCSymbolRefExpr::create(MO.getMBB()->getSymbol(), Ctx));
+      break;
+    case MachineOperand::MO_RegisterMask:
+      continue;
+    case MachineOperand::MO_GlobalAddress:
+      MCOp = LowerSymbolOperand(MO, GetGlobalAddressSymbol(MO));
+      break;
+    case MachineOperand::MO_BlockAddress:
+      MCOp = LowerSymbolOperand(MO, GetBlockAddressSymbol(MO));
+      break;
+    case MachineOperand::MO_ExternalSymbol:
+      MCOp = LowerSymbolOperand(MO, GetExternalSymbolSymbol(MO));
+      break;
+    case MachineOperand::MO_JumpTableIndex:
+      MCOp = LowerSymbolOperand(MO, GetJumpTableSymbol(MO));
+      break;
+    case MachineOperand::MO_ConstantPoolIndex:
+      MCOp = LowerSymbolOperand(MO, GetConstantPoolIndexSymbol(MO));
+      break;
+    default:
+      MI->dump();
+      llvm_unreachable("unknown operand type");
+    }
+
+    OutMI.addOperand(MCOp);
+  }
+}