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