lib/Target/ARM/ARMTargetMachine.cpp

   1 //===-- ARMTargetMachine.cpp - Define TargetMachine for ARM ---------------===//
   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 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #include "ARMTargetMachine.h"
  14 #include "ARMMCAsmInfo.h"
  15 #include "ARMFrameInfo.h"
  16 #include "ARM.h"
  17 #include "llvm/PassManager.h"
  18 #include "llvm/CodeGen/Passes.h"
  19 #include "llvm/Support/FormattedStream.h"
  20 #include "llvm/Target/TargetOptions.h"
  21 #include "llvm/Target/TargetRegistry.h"
  22 using namespace llvm;
  23
  24 static MCAsmInfo *createMCAsmInfo(const Target &T, StringRef TT) {
  25   Triple TheTriple(TT);
  26   switch (TheTriple.getOS()) {
  27   case Triple::Darwin:
  28     return new ARMMCAsmInfoDarwin();
  29   default:
  30     return new ARMELFMCAsmInfo();
  31   }
  32 }
  33
  34 // This is duplicated code. Refactor this.
  35 static MCStreamer *createMCStreamer(const Target &T, const std::string &TT,
  36                                     MCContext &Ctx, TargetAsmBackend &TAB,
  37                                     raw_ostream &_OS,
  38                                     MCCodeEmitter *_Emitter,
  39                                     bool RelaxAll) {
  40   Triple TheTriple(TT);
  41   switch (TheTriple.getOS()) {
  42   case Triple::Darwin:
  43     return createMachOStreamer(Ctx, TAB, _OS, _Emitter, RelaxAll);
  44   case Triple::MinGW32:
  45   case Triple::MinGW64:
  46   case Triple::Cygwin:
  47   case Triple::Win32:
  48     llvm_unreachable("ARM does not support Windows COFF format");
  49     return NULL;
  50   default:
  51     return createELFStreamer(Ctx, TAB, _OS, _Emitter, RelaxAll);
  52   }
  53 }
  54
  55 extern "C" void LLVMInitializeARMTarget() {
  56   // Register the target.
  57   RegisterTargetMachine<ARMTargetMachine> X(TheARMTarget);
  58   RegisterTargetMachine<ThumbTargetMachine> Y(TheThumbTarget);
  59
  60   // Register the target asm info.
  61   RegisterAsmInfoFn A(TheARMTarget, createMCAsmInfo);
  62   RegisterAsmInfoFn B(TheThumbTarget, createMCAsmInfo);
  63
  64   // Register the MC Code Emitter
  65   TargetRegistry::RegisterCodeEmitter(TheARMTarget,
  66                                       createARMMCCodeEmitter);
  67   TargetRegistry::RegisterCodeEmitter(TheThumbTarget,
  68                                       createARMMCCodeEmitter);
  69
  70   // Register the asm backend.
  71   TargetRegistry::RegisterAsmBackend(TheARMTarget,
  72                                      createARMAsmBackend);
  73   TargetRegistry::RegisterAsmBackend(TheThumbTarget,
  74                                      createARMAsmBackend);
  75
  76   // Register the object streamer.
  77   TargetRegistry::RegisterObjectStreamer(TheARMTarget,
  78                                          createMCStreamer);
  79   TargetRegistry::RegisterObjectStreamer(TheThumbTarget,
  80                                          createMCStreamer);
  81
  82 }
  83
  84 /// TargetMachine ctor - Create an ARM architecture model.
  85 ///
  86 ARMBaseTargetMachine::ARMBaseTargetMachine(const Target &T,
  87                                            const std::string &TT,
  88                                            const std::string &FS,
  89                                            bool isThumb)
  90   : LLVMTargetMachine(T, TT),
  91     Subtarget(TT, FS, isThumb),
  92     FrameInfo(Subtarget),
  93     JITInfo(),
  94     InstrItins(Subtarget.getInstrItineraryData())
  95 {
  96   DefRelocModel = getRelocationModel();
  97 }
  98
  99 ARMTargetMachine::ARMTargetMachine(const Target &T, const std::string &TT,
 100                                    const std::string &FS)
 101   : ARMBaseTargetMachine(T, TT, FS, false), InstrInfo(Subtarget),
 102     DataLayout(Subtarget.isAPCS_ABI() ?
 103                std::string("e-p:32:32-f64:32:64-i64:32:64-"
 104                            "v128:32:128-v64:32:64-n32") :
 105                std::string("e-p:32:32-f64:64:64-i64:64:64-"
 106                            "v128:64:128-v64:64:64-n32")),
 107     ELFWriterInfo(*this),
 108     TLInfo(*this),
 109     TSInfo(*this) {
 110   if (!Subtarget.hasARMOps())
 111     report_fatal_error("CPU: '" + Subtarget.getCPUString() + "' does not "
 112                        "support ARM mode execution!");
 113 }
 114
 115 ThumbTargetMachine::ThumbTargetMachine(const Target &T, const std::string &TT,
 116                                        const std::string &FS)
 117   : ARMBaseTargetMachine(T, TT, FS, true),
 118     InstrInfo(Subtarget.hasThumb2()
 119               ? ((ARMBaseInstrInfo*)new Thumb2InstrInfo(Subtarget))
 120               : ((ARMBaseInstrInfo*)new Thumb1InstrInfo(Subtarget))),
 121     DataLayout(Subtarget.isAPCS_ABI() ?
 122                std::string("e-p:32:32-f64:32:64-i64:32:64-"
 123                            "i16:16:32-i8:8:32-i1:8:32-"
 124                            "v128:32:128-v64:32:64-a:0:32-n32") :
 125                std::string("e-p:32:32-f64:64:64-i64:64:64-"
 126                            "i16:16:32-i8:8:32-i1:8:32-"
 127                            "v128:64:128-v64:64:64-a:0:32-n32")),
 128     ELFWriterInfo(*this),
 129     TLInfo(*this),
 130     TSInfo(*this) {
 131 }
 132
 133 // Pass Pipeline Configuration
 134 bool ARMBaseTargetMachine::addPreISel(PassManagerBase &PM,
 135                                       CodeGenOpt::Level OptLevel) {
 136   if (OptLevel != CodeGenOpt::None)
 137     PM.add(createARMGlobalMergePass(getTargetLowering()));
 138
 139   return false;
 140 }
 141
 142 bool ARMBaseTargetMachine::addInstSelector(PassManagerBase &PM,
 143                                            CodeGenOpt::Level OptLevel) {
 144   PM.add(createARMISelDag(*this, OptLevel));
 145   return false;
 146 }
 147
 148 bool ARMBaseTargetMachine::addPreRegAlloc(PassManagerBase &PM,
 149                                           CodeGenOpt::Level OptLevel) {
 150   // FIXME: temporarily disabling load / store optimization pass for Thumb1.
 151   if (OptLevel != CodeGenOpt::None && !Subtarget.isThumb1Only())
 152     PM.add(createARMLoadStoreOptimizationPass(true));
 153
 154   return true;
 155 }
 156
 157 bool ARMBaseTargetMachine::addPreSched2(PassManagerBase &PM,
 158                                         CodeGenOpt::Level OptLevel) {
 159   // FIXME: temporarily disabling load / store optimization pass for Thumb1.
 160   if (OptLevel != CodeGenOpt::None) {
 161     if (!Subtarget.isThumb1Only())
 162       PM.add(createARMLoadStoreOptimizationPass());
 163     if (Subtarget.hasNEON())
 164       PM.add(createNEONMoveFixPass());
 165   }
 166
 167   // Expand some pseudo instructions into multiple instructions to allow
 168   // proper scheduling.
 169   PM.add(createARMExpandPseudoPass());
 170
 171   if (OptLevel != CodeGenOpt::None) {
 172     if (!Subtarget.isThumb1Only())
 173       PM.add(createIfConverterPass());
 174   }
 175   if (Subtarget.isThumb2())
 176     PM.add(createThumb2ITBlockPass());
 177
 178   return true;
 179 }
 180
 181 bool ARMBaseTargetMachine::addPreEmitPass(PassManagerBase &PM,
 182                                           CodeGenOpt::Level OptLevel) {
 183   if (Subtarget.isThumb2() && !Subtarget.prefers32BitThumb())
 184     PM.add(createThumb2SizeReductionPass());
 185
 186   PM.add(createARMConstantIslandPass());
 187   return true;
 188 }
 189
 190 bool ARMBaseTargetMachine::addCodeEmitter(PassManagerBase &PM,
 191                                           CodeGenOpt::Level OptLevel,
 192                                           JITCodeEmitter &JCE) {
 193   // FIXME: Move this to TargetJITInfo!
 194   if (DefRelocModel == Reloc::Default)
 195     setRelocationModel(Reloc::Static);
 196
 197   // Machine code emitter pass for ARM.
 198   PM.add(createARMJITCodeEmitterPass(*this, JCE));
 199   return false;
 200 }