Define class MipsMCInstLower.

llvm-svn: 134633

3 files changed, 161 insertions, 0 deletions

diff --git a/llvm/lib/Target/Mips/CMakeLists.txt b/llvm/lib/Target/Mips/CMakeLists.txt
index bcbc83d965e..43df007fdb0 100644
--- a/llvm/lib/Target/Mips/CMakeLists.txt
+++ b/llvm/lib/Target/Mips/CMakeLists.txt
@@ -17,6 +17,7 @@ add_llvm_target(MipsCodeGen
   MipsISelLowering.cpp
   MipsFrameLowering.cpp
   MipsMCAsmInfo.cpp
+  MipsMCInstLower.cpp
   MipsMCSymbolRefExpr.cpp
   MipsRegisterInfo.cpp
   MipsSubtarget.cpp
diff --git a/llvm/lib/Target/Mips/MipsMCInstLower.cpp b/llvm/lib/Target/Mips/MipsMCInstLower.cpp
new file mode 100644
index 00000000000..416f7763202
--- /dev/null
+++ b/llvm/lib/Target/Mips/MipsMCInstLower.cpp
@@ -0,0 +1,117 @@
+//===-- MipsMCInstLower.cpp - Convert Mips 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 Mips MachineInstrs to their corresponding
+// MCInst records.
+//
+//===----------------------------------------------------------------------===//
+
+#include "MipsMCInstLower.h"
+#include "MipsAsmPrinter.h"
+#include "MipsInstrInfo.h"
+#include "MipsMCSymbolRefExpr.h"
+#include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/CodeGen/MachineInstr.h"
+#include "llvm/CodeGen/MachineOperand.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCInst.h"
+#include "llvm/Target/Mangler.h"
+using namespace llvm;
+
+MipsMCInstLower::MipsMCInstLower(Mangler *mang, const MachineFunction &mf,
+                                 MipsAsmPrinter &asmprinter)
+  : Ctx(mf.getContext()), Mang(mang), AsmPrinter(asmprinter) {}
+
+MCOperand MipsMCInstLower::LowerSymbolOperand(const MachineOperand &MO,
+                                              MachineOperandType MOTy) const {
+  MipsMCSymbolRefExpr::VariantKind Kind;
+  const MCSymbol *Symbol;
+  int Offset = 0;
+
+  switch(MO.getTargetFlags()) {
+  case MipsII::MO_NO_FLAG:  Kind = MipsMCSymbolRefExpr::VK_Mips_None; break;
+  case MipsII::MO_GPREL:    Kind = MipsMCSymbolRefExpr::VK_Mips_GPREL; break;
+  case MipsII::MO_GOT_CALL: Kind = MipsMCSymbolRefExpr::VK_Mips_GOT_CALL; break;
+  case MipsII::MO_GOT:      Kind = MipsMCSymbolRefExpr::VK_Mips_GOT; break;
+  case MipsII::MO_ABS_HI:   Kind = MipsMCSymbolRefExpr::VK_Mips_ABS_HI; break;
+  case MipsII::MO_ABS_LO:   Kind = MipsMCSymbolRefExpr::VK_Mips_ABS_LO; break;
+  case MipsII::MO_TLSGD:    Kind = MipsMCSymbolRefExpr::VK_Mips_TLSGD; break;
+  case MipsII::MO_GOTTPREL: Kind = MipsMCSymbolRefExpr::VK_Mips_GOTTPREL; break;
+  case MipsII::MO_TPREL_HI: Kind = MipsMCSymbolRefExpr::VK_Mips_TPREL_HI; break;
+  case MipsII::MO_TPREL_LO: Kind = MipsMCSymbolRefExpr::VK_Mips_TPREL_LO; break;
+  }
+
+  switch (MOTy) {
+    case MachineOperand::MO_MachineBasicBlock:
+      Symbol = MO.getMBB()->getSymbol();
+      break;
+
+    case MachineOperand::MO_GlobalAddress:
+      Symbol = Mang->getSymbol(MO.getGlobal());
+      break;
+
+    case MachineOperand::MO_BlockAddress:
+      Symbol = AsmPrinter.GetBlockAddressSymbol(MO.getBlockAddress());
+      break;
+
+    case MachineOperand::MO_ExternalSymbol:
+      Symbol = AsmPrinter.GetExternalSymbolSymbol(MO.getSymbolName());
+      break;
+
+    case MachineOperand::MO_JumpTableIndex:
+      Symbol = AsmPrinter.GetJTISymbol(MO.getIndex());
+      break;
+
+    case MachineOperand::MO_ConstantPoolIndex:
+      Symbol = AsmPrinter.GetCPISymbol(MO.getIndex());
+      if (MO.getOffset())
+        Offset = MO.getOffset();  
+      break;
+
+    default:
+      llvm_unreachable("<unknown operand type>");
+  }
+  
+  return MCOperand::CreateExpr(MipsMCSymbolRefExpr::Create(Kind, Symbol, Offset,
+                                                           Ctx));
+}
+
+void MipsMCInstLower::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;
+    MachineOperandType MOTy = MO.getType();
+
+    switch (MOTy) {
+    default:
+      MI->dump();
+      llvm_unreachable("unknown operand type");
+    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:
+    case MachineOperand::MO_GlobalAddress:
+    case MachineOperand::MO_ExternalSymbol:
+    case MachineOperand::MO_JumpTableIndex:
+    case MachineOperand::MO_ConstantPoolIndex:
+    case MachineOperand::MO_BlockAddress:
+      MCOp = LowerSymbolOperand(MO, MOTy);
+      break;
+    }
+    
+    OutMI.addOperand(MCOp);
+  }
+}
diff --git a/llvm/lib/Target/Mips/MipsMCInstLower.h b/llvm/lib/Target/Mips/MipsMCInstLower.h
new file mode 100644
index 00000000000..ec5201be7f6
--- /dev/null
+++ b/llvm/lib/Target/Mips/MipsMCInstLower.h
@@ -0,0 +1,43 @@
+//===-- MipsMCInstLower.h - Lower MachineInstr to MCInst -------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef MIPSMCINSTLOWER_H
+#define MIPSMCINSTLOWER_H
+#include "llvm/CodeGen/MachineOperand.h"
+#include "llvm/Support/Compiler.h"
+
+namespace llvm {
+  class MCAsmInfo;
+  class MCContext;
+  class MCInst;
+  class MCOperand;
+  class MCSymbol;
+  class MachineInstr;
+  class MachineFunction;
+  class Mangler;
+  class MipsAsmPrinter;
+  
+/// MipsMCInstLower - This class is used to lower an MachineInstr into an
+//                    MCInst.
+class LLVM_LIBRARY_VISIBILITY MipsMCInstLower {
+  typedef MachineOperand::MachineOperandType MachineOperandType;
+  MCContext &Ctx;
+  Mangler *Mang;
+  MipsAsmPrinter &AsmPrinter;
+public:
+  MipsMCInstLower(Mangler *mang, const MachineFunction &MF,
+                  MipsAsmPrinter &asmprinter);  
+  void Lower(const MachineInstr *MI, MCInst &OutMI) const;
+private:
+  MCOperand LowerSymbolOperand(const MachineOperand &MO,
+                               MachineOperandType MOTy) const;
+};
+}
+
+#endif