lib/Target/PowerPC/PPCTargetMachine.cpp

   1 //===-- PPCTargetMachine.cpp - Define TargetMachine for PowerPC -----------===//
   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 // Top-level implementation for the PowerPC target.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "PPC.h"
  15 #include "PPCMCAsmInfo.h"
  16 #include "PPCTargetMachine.h"
  17 #include "llvm/PassManager.h"
  18 #include "llvm/MC/MCStreamer.h"
  19 #include "llvm/Target/TargetOptions.h"
  20 #include "llvm/Target/TargetRegistry.h"
  21 #include "llvm/Support/FormattedStream.h"
  22 using namespace llvm;
  23
  24 static MCAsmInfo *createMCAsmInfo(const Target &T, StringRef TT) {
  25   Triple TheTriple(TT);
  26   bool isPPC64 = TheTriple.getArch() == Triple::ppc64;
  27   if (TheTriple.isOSDarwin())
  28     return new PPCMCAsmInfoDarwin(isPPC64);
  29   return new PPCLinuxMCAsmInfo(isPPC64);
  30
  31 }
  32
  33 // This is duplicated code. Refactor this.
  34 static MCStreamer *createMCStreamer(const Target &T, const std::string &TT,
  35                                     MCContext &Ctx, TargetAsmBackend &TAB,
  36                                     raw_ostream &OS,
  37                                     MCCodeEmitter *Emitter,
  38                                     bool RelaxAll,
  39                                     bool NoExecStack) {
  40   if (Triple(TT).isOSDarwin())
  41     return createMachOStreamer(Ctx, TAB, OS, Emitter, RelaxAll);
  42
  43   return NULL;
  44 }
  45
  46 extern "C" void LLVMInitializePowerPCTarget() {
  47   // Register the targets
  48   RegisterTargetMachine<PPC32TargetMachine> A(ThePPC32Target);
  49   RegisterTargetMachine<PPC64TargetMachine> B(ThePPC64Target);
  50
  51   RegisterAsmInfoFn C(ThePPC32Target, createMCAsmInfo);
  52   RegisterAsmInfoFn D(ThePPC64Target, createMCAsmInfo);
  53
  54   // Register the MC Code Emitter
  55   TargetRegistry::RegisterCodeEmitter(ThePPC32Target, createPPCMCCodeEmitter);
  56   TargetRegistry::RegisterCodeEmitter(ThePPC64Target, createPPCMCCodeEmitter);
  57
  58
  59   // Register the asm backend.
  60   TargetRegistry::RegisterAsmBackend(ThePPC32Target, createPPCAsmBackend);
  61   TargetRegistry::RegisterAsmBackend(ThePPC64Target, createPPCAsmBackend);
  62
  63   // Register the object streamer.
  64   TargetRegistry::RegisterObjectStreamer(ThePPC32Target, createMCStreamer);
  65   TargetRegistry::RegisterObjectStreamer(ThePPC64Target, createMCStreamer);
  66 }
  67
  68
  69 PPCTargetMachine::PPCTargetMachine(const Target &T, const std::string &TT,
  70                                    const std::string &CPU,
  71                                    const std::string &FS, bool is64Bit)
  72   : LLVMTargetMachine(T, TT, CPU, FS),
  73     Subtarget(TT, CPU, FS, is64Bit),
  74     DataLayout(Subtarget.getTargetDataString()), InstrInfo(*this),
  75     FrameLowering(Subtarget), JITInfo(*this, is64Bit),
  76     TLInfo(*this), TSInfo(*this),
  77     InstrItins(Subtarget.getInstrItineraryData()) {
  78
  79   if (getRelocationModel() == Reloc::Default) {
  80     if (Subtarget.isDarwin())
  81       setRelocationModel(Reloc::DynamicNoPIC);
  82     else
  83       setRelocationModel(Reloc::Static);
  84   }
  85 }
  86
  87 /// Override this for PowerPC.  Tail merging happily breaks up instruction issue
  88 /// groups, which typically degrades performance.
  89 bool PPCTargetMachine::getEnableTailMergeDefault() const { return false; }
  90
  91 PPC32TargetMachine::PPC32TargetMachine(const Target &T, const std::string &TT,
  92                                        const std::string &CPU,
  93                                        const std::string &FS)
  94   : PPCTargetMachine(T, TT, CPU, FS, false) {
  95 }
  96
  97
  98 PPC64TargetMachine::PPC64TargetMachine(const Target &T, const std::string &TT,
  99                                        const std::string &CPU,
 100                                        const std::string &FS)
 101   : PPCTargetMachine(T, TT, CPU, FS, true) {
 102 }
 103
 104
 105 //===----------------------------------------------------------------------===//
 106 // Pass Pipeline Configuration
 107 //===----------------------------------------------------------------------===//
 108
 109 bool PPCTargetMachine::addInstSelector(PassManagerBase &PM,
 110                                        CodeGenOpt::Level OptLevel) {
 111   // Install an instruction selector.
 112   PM.add(createPPCISelDag(*this));
 113   return false;
 114 }
 115
 116 bool PPCTargetMachine::addPreEmitPass(PassManagerBase &PM,
 117                                       CodeGenOpt::Level OptLevel) {
 118   // Must run branch selection immediately preceding the asm printer.
 119   PM.add(createPPCBranchSelectionPass());
 120   return false;
 121 }
 122
 123 bool PPCTargetMachine::addCodeEmitter(PassManagerBase &PM,
 124                                       CodeGenOpt::Level OptLevel,
 125                                       JITCodeEmitter &JCE) {
 126   // The JIT should use the static relocation model in ppc32 mode, PIC in ppc64.
 127   // FIXME: This should be moved to TargetJITInfo!!
 128   if (Subtarget.isPPC64()) {
 129     // We use PIC codegen in ppc64 mode, because otherwise we'd have to use many
 130     // instructions to materialize arbitrary global variable + function +
 131     // constant pool addresses.
 132     setRelocationModel(Reloc::PIC_);
 133     // Temporary workaround for the inability of PPC64 JIT to handle jump
 134     // tables.
 135     DisableJumpTables = true;
 136   } else {
 137     setRelocationModel(Reloc::Static);
 138   }
 139
 140   // Inform the subtarget that we are in JIT mode.  FIXME: does this break macho
 141   // writing?
 142   Subtarget.SetJITMode();
 143
 144   // Machine code emitter pass for PowerPC.
 145   PM.add(createPPCJITCodeEmitterPass(*this, JCE));
 146
 147   return false;
 148 }