lib/Target/MBlaze/MBlazeTargetMachine.cpp

   1 //===-- MBlazeTargetMachine.cpp - Define TargetMachine for MBlaze ---------===//
   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 // Implements the info about MBlaze target spec.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "MBlaze.h"
  15 #include "MBlazeMCAsmInfo.h"
  16 #include "MBlazeTargetMachine.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   default:
  28     return new MBlazeMCAsmInfo();
  29   }
  30 }
  31
  32 static MCStreamer *createMCStreamer(const Target &T, const std::string &TT,
  33                                     MCContext &Ctx, TargetAsmBackend &TAB,
  34                                     raw_ostream &_OS,
  35                                     MCCodeEmitter *_Emitter,
  36                                     bool RelaxAll,
  37                                     bool NoExecStack) {
  38   Triple TheTriple(TT);
  39   switch (TheTriple.getOS()) {
  40   case Triple::Darwin:
  41     llvm_unreachable("MBlaze does not support Darwin MACH-O format");
  42     return NULL;
  43   case Triple::MinGW32:
  44   case Triple::Cygwin:
  45   case Triple::Win32:
  46     llvm_unreachable("MBlaze does not support Windows COFF format");
  47     return NULL;
  48   default:
  49     return createELFStreamer(Ctx, TAB, _OS, _Emitter, RelaxAll,
  50                              NoExecStack);
  51   }
  52 }
  53
  54
  55 extern "C" void LLVMInitializeMBlazeTarget() {
  56   // Register the target.
  57   RegisterTargetMachine<MBlazeTargetMachine> X(TheMBlazeTarget);
  58
  59   // Register the target asm info.
  60   RegisterAsmInfoFn A(TheMBlazeTarget, createMCAsmInfo);
  61
  62   // Register the MC code emitter
  63   TargetRegistry::RegisterCodeEmitter(TheMBlazeTarget,
  64                                       llvm::createMBlazeMCCodeEmitter);
  65
  66   // Register the asm backend
  67   TargetRegistry::RegisterAsmBackend(TheMBlazeTarget,
  68                                      createMBlazeAsmBackend);
  69
  70   // Register the object streamer
  71   TargetRegistry::RegisterObjectStreamer(TheMBlazeTarget,
  72                                          createMCStreamer);
  73
  74 }
  75
  76 // DataLayout --> Big-endian, 32-bit pointer/ABI/alignment
  77 // The stack is always 8 byte aligned
  78 // On function prologue, the stack is created by decrementing
  79 // its pointer. Once decremented, all references are done with positive
  80 // offset from the stack/frame pointer, using StackGrowsUp enables
  81 // an easier handling.
  82 MBlazeTargetMachine::
  83 MBlazeTargetMachine(const Target &T, const std::string &TT,
  84                     const std::string &FS):
  85   LLVMTargetMachine(T, TT),
  86   Subtarget(TT, FS),
  87   DataLayout("E-p:32:32:32-i8:8:8-i16:16:16"),
  88   InstrInfo(*this),
  89   FrameLowering(Subtarget),
  90   TLInfo(*this), TSInfo(*this), ELFWriterInfo(*this),
  91   InstrItins(Subtarget.getInstrItineraryData()) {
  92   if (getRelocationModel() == Reloc::Default) {
  93       setRelocationModel(Reloc::Static);
  94   }
  95
  96   if (getCodeModel() == CodeModel::Default)
  97     setCodeModel(CodeModel::Small);
  98 }
  99
 100 // Install an instruction selector pass using
 101 // the ISelDag to gen MBlaze code.
 102 bool MBlazeTargetMachine::addInstSelector(PassManagerBase &PM,
 103                                           CodeGenOpt::Level OptLevel) {
 104   PM.add(createMBlazeISelDag(*this));
 105   return false;
 106 }
 107
 108 // Implemented by targets that want to run passes immediately before
 109 // machine code is emitted. return true if -print-machineinstrs should
 110 // print out the code after the passes.
 111 bool MBlazeTargetMachine::addPreEmitPass(PassManagerBase &PM,
 112                                          CodeGenOpt::Level OptLevel) {
 113   PM.add(createMBlazeDelaySlotFillerPass(*this));
 114   return true;
 115 }