contrib/llvm/lib/Target/SystemZ/MCTargetDesc/SystemZMCTargetDesc.cpp

   1 //===-- SystemZMCTargetDesc.cpp - SystemZ target descriptions -------------===//
   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 #include "SystemZMCTargetDesc.h"
  11 #include "InstPrinter/SystemZInstPrinter.h"
  12 #include "SystemZMCAsmInfo.h"
  13 #include "llvm/MC/MCCodeGenInfo.h"
  14 #include "llvm/MC/MCInstrInfo.h"
  15 #include "llvm/MC/MCStreamer.h"
  16 #include "llvm/MC/MCSubtargetInfo.h"
  17 #include "llvm/Support/TargetRegistry.h"
  18
  19 #define GET_INSTRINFO_MC_DESC
  20 #include "SystemZGenInstrInfo.inc"
  21
  22 #define GET_SUBTARGETINFO_MC_DESC
  23 #include "SystemZGenSubtargetInfo.inc"
  24
  25 #define GET_REGINFO_MC_DESC
  26 #include "SystemZGenRegisterInfo.inc"
  27
  28 using namespace llvm;
  29
  30 static MCAsmInfo *createSystemZMCAsmInfo(const Target &T, StringRef TT) {
  31   MCAsmInfo *MAI = new SystemZMCAsmInfo(T, TT);
  32   MachineLocation FPDst(MachineLocation::VirtualFP);
  33   MachineLocation FPSrc(SystemZ::R15D, -SystemZMC::CFAOffsetFromInitialSP);
  34   MAI->addInitialFrameState(0, FPDst, FPSrc);
  35   return MAI;
  36 }
  37
  38 static MCInstrInfo *createSystemZMCInstrInfo() {
  39   MCInstrInfo *X = new MCInstrInfo();
  40   InitSystemZMCInstrInfo(X);
  41   return X;
  42 }
  43
  44 static MCRegisterInfo *createSystemZMCRegisterInfo(StringRef TT) {
  45   MCRegisterInfo *X = new MCRegisterInfo();
  46   InitSystemZMCRegisterInfo(X, SystemZ::R14D);
  47   return X;
  48 }
  49
  50 static MCSubtargetInfo *createSystemZMCSubtargetInfo(StringRef TT,
  51                                                      StringRef CPU,
  52                                                      StringRef FS) {
  53   MCSubtargetInfo *X = new MCSubtargetInfo();
  54   InitSystemZMCSubtargetInfo(X, TT, CPU, FS);
  55   return X;
  56 }
  57
  58 static MCCodeGenInfo *createSystemZMCCodeGenInfo(StringRef TT, Reloc::Model RM,
  59                                                  CodeModel::Model CM,
  60                                                  CodeGenOpt::Level OL) {
  61   MCCodeGenInfo *X = new MCCodeGenInfo();
  62
  63   // Static code is suitable for use in a dynamic executable; there is no
  64   // separate DynamicNoPIC model.
  65   if (RM == Reloc::Default || RM == Reloc::DynamicNoPIC)
  66     RM = Reloc::Static;
  67
  68   // For SystemZ we define the models as follows:
  69   //
  70   // Small:  BRASL can call any function and will use a stub if necessary.
  71   //         Locally-binding symbols will always be in range of LARL.
  72   //
  73   // Medium: BRASL can call any function and will use a stub if necessary.
  74   //         GOT slots and locally-defined text will always be in range
  75   //         of LARL, but other symbols might not be.
  76   //
  77   // Large:  Equivalent to Medium for now.
  78   //
  79   // Kernel: Equivalent to Medium for now.
  80   //
  81   // This means that any PIC module smaller than 4GB meets the
  82   // requirements of Small, so Small seems like the best default there.
  83   //
  84   // All symbols bind locally in a non-PIC module, so the choice is less
  85   // obvious.  There are two cases:
  86   //
  87   // - When creating an executable, PLTs and copy relocations allow
  88   //   us to treat external symbols as part of the executable.
  89   //   Any executable smaller than 4GB meets the requirements of Small,
  90   //   so that seems like the best default.
  91   //
  92   // - When creating JIT code, stubs will be in range of BRASL if the
  93   //   image is less than 4GB in size.  GOT entries will likewise be
  94   //   in range of LARL.  However, the JIT environment has no equivalent
  95   //   of copy relocs, so locally-binding data symbols might not be in
  96   //   the range of LARL.  We need the Medium model in that case.
  97   if (CM == CodeModel::Default)
  98     CM = CodeModel::Small;
  99   else if (CM == CodeModel::JITDefault)
 100     CM = RM == Reloc::PIC_ ? CodeModel::Small : CodeModel::Medium;
 101   X->InitMCCodeGenInfo(RM, CM, OL);
 102   return X;
 103 }
 104
 105 static MCInstPrinter *createSystemZMCInstPrinter(const Target &T,
 106                                                  unsigned SyntaxVariant,
 107                                                  const MCAsmInfo &MAI,
 108                                                  const MCInstrInfo &MII,
 109                                                  const MCRegisterInfo &MRI,
 110                                                  const MCSubtargetInfo &STI) {
 111   return new SystemZInstPrinter(MAI, MII, MRI);
 112 }
 113
 114 static MCStreamer *createSystemZMCObjectStreamer(const Target &T, StringRef TT,
 115                                                  MCContext &Ctx,
 116                                                  MCAsmBackend &MAB,
 117                                                  raw_ostream &OS,
 118                                                  MCCodeEmitter *Emitter,
 119                                                  bool RelaxAll,
 120                                                  bool NoExecStack) {
 121   return createELFStreamer(Ctx, MAB, OS, Emitter, RelaxAll, NoExecStack);
 122 }
 123
 124 extern "C" void LLVMInitializeSystemZTargetMC() {
 125   // Register the MCAsmInfo.
 126   TargetRegistry::RegisterMCAsmInfo(TheSystemZTarget,
 127                                     createSystemZMCAsmInfo);
 128
 129   // Register the MCCodeGenInfo.
 130   TargetRegistry::RegisterMCCodeGenInfo(TheSystemZTarget,
 131                                         createSystemZMCCodeGenInfo);
 132
 133   // Register the MCCodeEmitter.
 134   TargetRegistry::RegisterMCCodeEmitter(TheSystemZTarget,
 135                                         createSystemZMCCodeEmitter);
 136
 137   // Register the MCInstrInfo.
 138   TargetRegistry::RegisterMCInstrInfo(TheSystemZTarget,
 139                                       createSystemZMCInstrInfo);
 140
 141   // Register the MCRegisterInfo.
 142   TargetRegistry::RegisterMCRegInfo(TheSystemZTarget,
 143                                     createSystemZMCRegisterInfo);
 144
 145   // Register the MCSubtargetInfo.
 146   TargetRegistry::RegisterMCSubtargetInfo(TheSystemZTarget,
 147                                           createSystemZMCSubtargetInfo);
 148
 149   // Register the MCAsmBackend.
 150   TargetRegistry::RegisterMCAsmBackend(TheSystemZTarget,
 151                                        createSystemZMCAsmBackend);
 152
 153   // Register the MCInstPrinter.
 154   TargetRegistry::RegisterMCInstPrinter(TheSystemZTarget,
 155                                         createSystemZMCInstPrinter);
 156
 157   // Register the MCObjectStreamer;
 158   TargetRegistry::RegisterMCObjectStreamer(TheSystemZTarget,
 159                                            createSystemZMCObjectStreamer);
 160 }