lib/Target/ARM/ARMTargetMachine.cpp

//===-- ARMTargetMachine.cpp - Define TargetMachine for ARM ---------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file was developed by the "Instituto Nokia de Tecnologia" and
// is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
//
//===----------------------------------------------------------------------===//

#include "ARMTargetMachine.h"
#include "ARMTargetAsmInfo.h"
#include "ARMFrameInfo.h"
#include "ARM.h"
#include "llvm/Module.h"
#include "llvm/PassManager.h"
#include "llvm/CodeGen/Passes.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Target/TargetMachineRegistry.h"
#include "llvm/Target/TargetOptions.h"
using namespace llvm;

static cl::opt<bool> DisableLdStOpti("disable-arm-loadstore-opti", cl::Hidden,
                              cl::desc("Disable load store optimization pass"));
static cl::opt<bool> EnableIfConversion("enable-arm-if-conversion", cl::Hidden,
                              cl::desc("Enable if-conversion pass"));

namespace {
  // Register the target.
  RegisterTarget<ARMTargetMachine>   X("arm",   "  ARM");
  RegisterTarget<ThumbTargetMachine> Y("thumb", "  Thumb");
}

/// ThumbTargetMachine - Create an Thumb architecture model.
///
unsigned ThumbTargetMachine::getModuleMatchQuality(const Module &M) {
  std::string TT = M.getTargetTriple();
  if (TT.size() >= 6 && std::string(TT.begin(), TT.begin()+6) == "thumb-")
    return 20;

  return M.getPointerSize() == Module::Pointer32;
}

ThumbTargetMachine::ThumbTargetMachine(const Module &M, const std::string &FS) 
  : ARMTargetMachine(M, FS, true) {
}

/// TargetMachine ctor - Create an ARM architecture model.
///
ARMTargetMachine::ARMTargetMachine(const Module &M, const std::string &FS,
                                   bool isThumb)
  : Subtarget(M, FS, isThumb),
    DataLayout(Subtarget.isAPCS_ABI() ?
               // APCS ABI
          (isThumb ?
           std::string("e-p:32:32-f64:32:32-i64:32:32-"
                       "i16:16:32-i8:8:32-i1:8:32-a:0:32") :
           std::string("e-p:32:32-f64:32:32-i64:32:32")) :
               // AAPCS ABI
          (isThumb ?
           std::string("e-p:32:32-f64:64:64-i64:64:64-"
                       "i16:16:32-i8:8:32-i1:8:32-a:0:32") :
           std::string("e-p:32:32-f64:64:64-i64:64:64"))),
    InstrInfo(Subtarget),
    FrameInfo(Subtarget),
    TLInfo(*this) {}

unsigned ARMTargetMachine::getModuleMatchQuality(const Module &M) {
  std::string TT = M.getTargetTriple();
  if (TT.size() >= 4 && std::string(TT.begin(), TT.begin()+4) == "arm-")
    return 20;

  return M.getPointerSize() == Module::Pointer32;
}


const TargetAsmInfo *ARMTargetMachine::createTargetAsmInfo() const {
  return new ARMTargetAsmInfo(*this);
}


// Pass Pipeline Configuration
bool ARMTargetMachine::addInstSelector(FunctionPassManager &PM, bool Fast) {
  PM.add(createARMISelDag(*this));
  return false;
}

bool ARMTargetMachine::addPostRegAlloc(FunctionPassManager &PM, bool Fast) {
  if (Fast || !EnableIfConversion || Subtarget.isThumb())
    return false;

  PM.add(createIfConverterPass());
  return true;
}

bool ARMTargetMachine::addPreEmitPass(FunctionPassManager &PM, bool Fast) {
  // FIXME: temporarily disabling load / store optimization pass for Thumb mode.
  if (!Fast && !DisableLdStOpti && !Subtarget.isThumb())
    PM.add(createARMLoadStoreOptimizationPass());
  
  PM.add(createARMConstantIslandPass());
  return true;
}

bool ARMTargetMachine::addAssemblyEmitter(FunctionPassManager &PM, bool Fast, 
                                          std::ostream &Out) {
  // Output assembly language.
  PM.add(createARMCodePrinterPass(Out, *this));
  return false;
}