//===-- PowerPCTargetMachine.cpp - Define TargetMachine for PowerPC -------===//
// 
//                     The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
// 
//===----------------------------------------------------------------------===//
// 
//
//===----------------------------------------------------------------------===//

#include "PowerPCTargetMachine.h"
#include "PowerPC.h"
#include "llvm/Module.h"
#include "llvm/PassManager.h"
#include "llvm/CodeGen/IntrinsicLowering.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/Passes.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/Target/TargetMachineRegistry.h"
#include "llvm/Transforms/Scalar.h"
#include <iostream>
using namespace llvm;

namespace {
  // Register the target.
  RegisterTarget<PowerPCTargetMachine> X("powerpc", "  PowerPC (experimental)");
}

unsigned PowerPCTargetMachine::getJITMatchQuality() {
#if defined(__POWERPC__) || defined (__ppc__) || defined(_POWER)
  return 10;
#else
  return 0;
#endif
}
  
unsigned PowerPCTargetMachine::getModuleMatchQuality(const Module &M) {
  if (M.getEndianness()  == Module::BigEndian &&
      M.getPointerSize() == Module::Pointer32)
    return 10;                                   // Direct match
  else if (M.getEndianness() != Module::AnyEndianness ||
           M.getPointerSize() != Module::AnyPointerSize)
    return 0;                                    // Match for some other target

  return getJITMatchQuality()/2;
}


/// PowerPCTargetMachine ctor - Create an ILP32 architecture model
///
PowerPCTargetMachine::PowerPCTargetMachine(const Module &M,
                                           IntrinsicLowering *IL)
  : TargetMachine("PowerPC", IL, false, 4, 4, 4, 4, 4, 4, 2, 1, 4),
    FrameInfo(TargetFrameInfo::StackGrowsDown, 16, -4), JITInfo(*this) {
}

/// addPassesToEmitAssembly - Add passes to the specified pass manager
/// to implement a static compiler for this target.
///
bool PowerPCTargetMachine::addPassesToEmitAssembly(PassManager &PM,
                                                   std::ostream &Out) {
  // FIXME: Implement efficient support for garbage collection intrinsics.
  PM.add(createLowerGCPass());

  // FIXME: Implement the invoke/unwind instructions!
  PM.add(createLowerInvokePass());

  // FIXME: Implement the switch instruction in the instruction selector!
  PM.add(createLowerSwitchPass());

  PM.add(createLowerConstantExpressionsPass());

  // Make sure that no unreachable blocks are instruction selected.
  PM.add(createUnreachableBlockEliminationPass());

  PM.add(createPPCSimpleInstructionSelector(*this));

  if (PrintMachineCode)
    PM.add(createMachineFunctionPrinterPass(&std::cerr));

  PM.add(createRegisterAllocator());

  if (PrintMachineCode)
    PM.add(createMachineFunctionPrinterPass(&std::cerr));

  PM.add(createPrologEpilogCodeInserter());
  PM.add(createPPCCodePrinterPass(Out, *this));
  PM.add(createMachineCodeDeleter());
  return false;
}

/// addPassesToJITCompile - Add passes to the specified pass manager to
/// implement a fast dynamic compiler for this target.
///
void PowerPCJITInfo::addPassesToJITCompile(FunctionPassManager &PM) {
  // FIXME: Implement efficient support for garbage collection intrinsics.
  PM.add(createLowerGCPass());

  // FIXME: Implement the invoke/unwind instructions!
  PM.add(createLowerInvokePass());

  // FIXME: Implement the switch instruction in the instruction selector!
  PM.add(createLowerSwitchPass());

  PM.add(createLowerConstantExpressionsPass());

  // Make sure that no unreachable blocks are instruction selected.
  PM.add(createUnreachableBlockEliminationPass());

  PM.add(createPPCSimpleInstructionSelector(TM));
  PM.add(createRegisterAllocator());
  PM.add(createPrologEpilogCodeInserter());
}