lib/Target/SystemZ/SystemZAsmPrinter.cpp

   1 //===-- SystemZAsmPrinter.cpp - SystemZ LLVM assembly writer ---------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file contains a printer that converts from our internal representation
  11 // of machine-dependent LLVM code to the SystemZ assembly language.
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #define DEBUG_TYPE "asm-printer"
  16 #include "SystemZ.h"
  17 #include "SystemZInstrInfo.h"
  18 #include "SystemZTargetMachine.h"
  19 #include "llvm/Constants.h"
  20 #include "llvm/DerivedTypes.h"
  21 #include "llvm/Module.h"
  22 #include "llvm/Assembly/Writer.h"
  23 #include "llvm/CodeGen/AsmPrinter.h"
  24 #include "llvm/CodeGen/MachineModuleInfo.h"
  25 #include "llvm/CodeGen/MachineFunctionPass.h"
  26 #include "llvm/CodeGen/MachineConstantPool.h"
  27 #include "llvm/MC/MCStreamer.h"
  28 #include "llvm/MC/MCAsmInfo.h"
  29 #include "llvm/MC/MCSymbol.h"
  30 #include "llvm/Target/Mangler.h"
  31 #include "llvm/Target/TargetData.h"
  32 #include "llvm/Target/TargetLoweringObjectFile.h"
  33 #include "llvm/Target/TargetRegistry.h"
  34 #include "llvm/ADT/SmallString.h"
  35 #include "llvm/Support/raw_ostream.h"
  36 using namespace llvm;
  37
  38 namespace {
  39   class SystemZAsmPrinter : public AsmPrinter {
  40   public:
  41     SystemZAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
  42       : AsmPrinter(TM, Streamer) {}
  43
  44     virtual const char *getPassName() const {
  45       return "SystemZ Assembly Printer";
  46     }
  47
  48     void printOperand(const MachineInstr *MI, int OpNum, raw_ostream &O,
  49                       const char* Modifier = 0);
  50     void printPCRelImmOperand(const MachineInstr *MI, int OpNum, raw_ostream &O);
  51     void printRIAddrOperand(const MachineInstr *MI, int OpNum, raw_ostream &O,
  52                             const char* Modifier = 0);
  53     void printRRIAddrOperand(const MachineInstr *MI, int OpNum, raw_ostream &O,
  54                              const char* Modifier = 0);
  55     void printS16ImmOperand(const MachineInstr *MI, int OpNum, raw_ostream &O) {
  56       O << (int16_t)MI->getOperand(OpNum).getImm();
  57     }
  58     void printU16ImmOperand(const MachineInstr *MI, int OpNum, raw_ostream &O) {
  59       O << (uint16_t)MI->getOperand(OpNum).getImm();
  60     }
  61     void printS32ImmOperand(const MachineInstr *MI, int OpNum, raw_ostream &O) {
  62       O << (int32_t)MI->getOperand(OpNum).getImm();
  63     }
  64     void printU32ImmOperand(const MachineInstr *MI, int OpNum, raw_ostream &O) {
  65       O << (uint32_t)MI->getOperand(OpNum).getImm();
  66     }
  67
  68     void printInstruction(const MachineInstr *MI, raw_ostream &O);
  69     static const char *getRegisterName(unsigned RegNo);
  70
  71     void EmitInstruction(const MachineInstr *MI);
  72   };
  73 } // end of anonymous namespace
  74
  75 #include "SystemZGenAsmWriter.inc"
  76
  77 void SystemZAsmPrinter::EmitInstruction(const MachineInstr *MI) {
  78   SmallString<128> Str;
  79   raw_svector_ostream OS(Str);
  80   printInstruction(MI, OS);
  81   OutStreamer.EmitRawText(OS.str());
  82 }
  83
  84 void SystemZAsmPrinter::printPCRelImmOperand(const MachineInstr *MI, int OpNum,
  85                                              raw_ostream &O) {
  86   const MachineOperand &MO = MI->getOperand(OpNum);
  87   switch (MO.getType()) {
  88   case MachineOperand::MO_Immediate:
  89     O << MO.getImm();
  90     return;
  91   case MachineOperand::MO_MachineBasicBlock:
  92     O << *MO.getMBB()->getSymbol();
  93     return;
  94   case MachineOperand::MO_GlobalAddress: {
  95     const GlobalValue *GV = MO.getGlobal();
  96     O << *Mang->getSymbol(GV);
  97
  98     // Assemble calls via PLT for externally visible symbols if PIC.
  99     if (TM.getRelocationModel() == Reloc::PIC_ &&
 100         !GV->hasHiddenVisibility() && !GV->hasProtectedVisibility() &&
 101         !GV->hasLocalLinkage())
 102       O << "@PLT";
 103
 104     printOffset(MO.getOffset(), O);
 105     return;
 106   }
 107   case MachineOperand::MO_ExternalSymbol: {
 108     std::string Name(MAI->getGlobalPrefix());
 109     Name += MO.getSymbolName();
 110     O << Name;
 111
 112     if (TM.getRelocationModel() == Reloc::PIC_)
 113       O << "@PLT";
 114
 115     return;
 116   }
 117   default:
 118     assert(0 && "Not implemented yet!");
 119   }
 120 }
 121
 122
 123 void SystemZAsmPrinter::printOperand(const MachineInstr *MI, int OpNum,
 124                                      raw_ostream &O, const char *Modifier) {
 125   const MachineOperand &MO = MI->getOperand(OpNum);
 126   switch (MO.getType()) {
 127   case MachineOperand::MO_Register: {
 128     assert (TargetRegisterInfo::isPhysicalRegister(MO.getReg()) &&
 129             "Virtual registers should be already mapped!");
 130     unsigned Reg = MO.getReg();
 131     if (Modifier && strncmp(Modifier, "subreg", 6) == 0) {
 132       if (strncmp(Modifier + 7, "even", 4) == 0)
 133         Reg = TM.getRegisterInfo()->getSubReg(Reg, SystemZ::subreg_32bit);
 134       else if (strncmp(Modifier + 7, "odd", 3) == 0)
 135         Reg = TM.getRegisterInfo()->getSubReg(Reg, SystemZ::subreg_odd32);
 136       else
 137         assert(0 && "Invalid subreg modifier");
 138     }
 139
 140     O << '%' << getRegisterName(Reg);
 141     return;
 142   }
 143   case MachineOperand::MO_Immediate:
 144     O << MO.getImm();
 145     return;
 146   case MachineOperand::MO_MachineBasicBlock:
 147     O << *MO.getMBB()->getSymbol();
 148     return;
 149   case MachineOperand::MO_JumpTableIndex:
 150     O << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() << '_'
 151       << MO.getIndex();
 152
 153     return;
 154   case MachineOperand::MO_ConstantPoolIndex:
 155     O << MAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
 156       << MO.getIndex();
 157
 158     printOffset(MO.getOffset(), O);
 159     break;
 160   case MachineOperand::MO_GlobalAddress:
 161     O << *Mang->getSymbol(MO.getGlobal());
 162     break;
 163   case MachineOperand::MO_ExternalSymbol: {
 164     O << *GetExternalSymbolSymbol(MO.getSymbolName());
 165     break;
 166   }
 167   default:
 168     assert(0 && "Not implemented yet!");
 169   }
 170
 171   switch (MO.getTargetFlags()) {
 172   default: assert(0 && "Unknown target flag on GV operand");
 173   case SystemZII::MO_NO_FLAG:
 174     break;
 175   case SystemZII::MO_GOTENT:    O << "@GOTENT";    break;
 176   case SystemZII::MO_PLT:       O << "@PLT";       break;
 177   }
 178
 179   printOffset(MO.getOffset(), O);
 180 }
 181
 182 void SystemZAsmPrinter::printRIAddrOperand(const MachineInstr *MI, int OpNum,
 183                                            raw_ostream &O,
 184                                            const char *Modifier) {
 185   const MachineOperand &Base = MI->getOperand(OpNum);
 186
 187   // Print displacement operand.
 188   printOperand(MI, OpNum+1, O);
 189
 190   // Print base operand (if any)
 191   if (Base.getReg()) {
 192     O << '(';
 193     printOperand(MI, OpNum, O);
 194     O << ')';
 195   }
 196 }
 197
 198 void SystemZAsmPrinter::printRRIAddrOperand(const MachineInstr *MI, int OpNum,
 199                                             raw_ostream &O,
 200                                             const char *Modifier) {
 201   const MachineOperand &Base = MI->getOperand(OpNum);
 202   const MachineOperand &Index = MI->getOperand(OpNum+2);
 203
 204   // Print displacement operand.
 205   printOperand(MI, OpNum+1, O);
 206
 207   // Print base operand (if any)
 208   if (Base.getReg()) {
 209     O << '(';
 210     printOperand(MI, OpNum, O);
 211     if (Index.getReg()) {
 212       O << ',';
 213       printOperand(MI, OpNum+2, O);
 214     }
 215     O << ')';
 216   } else
 217     assert(!Index.getReg() && "Should allocate base register first!");
 218 }
 219
 220 // Force static initialization.
 221 extern "C" void LLVMInitializeSystemZAsmPrinter() {
 222   RegisterAsmPrinter<SystemZAsmPrinter> X(TheSystemZTarget);
 223 }