Sparc.cpp

//===-- Sparc.cpp - General implementation file for the Sparc Target ------===//
//
// This file contains the code for the Sparc Target that does not fit in any of
// the other files in this directory.
//
//===----------------------------------------------------------------------===//

#include "SparcInternals.h"
#include "llvm/Target/Sparc.h"
#include "llvm/Function.h"
#include "llvm/CodeGen/MachineFunction.h"
using std::cerr;

// Build the MachineInstruction Description Array...
const MachineInstrDescriptor SparcMachineInstrDesc[] = {
#define I(ENUM, OPCODESTRING, NUMOPERANDS, RESULTPOS, MAXIMM, IMMSE, \
          NUMDELAYSLOTS, LATENCY, SCHEDCLASS, INSTFLAGS)             \
  { OPCODESTRING, NUMOPERANDS, RESULTPOS, MAXIMM, IMMSE,             \
          NUMDELAYSLOTS, LATENCY, SCHEDCLASS, INSTFLAGS },
#include "SparcInstr.def"
};

//----------------------------------------------------------------------------
// allocateSparcTargetMachine - Allocate and return a subclass of TargetMachine
// that implements the Sparc backend. (the llvm/CodeGen/Sparc.h interface)
//----------------------------------------------------------------------------

TargetMachine *allocateSparcTargetMachine() { return new UltraSparc(); }



//---------------------------------------------------------------------------
// class UltraSparcFrameInfo 
// 
// Purpose:
//   Interface to stack frame layout info for the UltraSPARC.
//   Starting offsets for each area of the stack frame are aligned at
//   a multiple of getStackFrameSizeAlignment().
//---------------------------------------------------------------------------

int
UltraSparcFrameInfo::getFirstAutomaticVarOffset(MachineFunction& ,
                                                bool& pos) const
{
  pos = false;                          // static stack area grows downwards
  return StaticAreaOffsetFromFP;
}

int
UltraSparcFrameInfo::getRegSpillAreaOffset(MachineFunction& mcInfo,
                                           bool& pos) const
{
  mcInfo.freezeAutomaticVarsArea();     // ensure no more auto vars are added
  
  pos = false;                          // static stack area grows downwards
  unsigned int autoVarsSize = mcInfo.getAutomaticVarsSize();
  return StaticAreaOffsetFromFP - autoVarsSize; 
}

int
UltraSparcFrameInfo::getTmpAreaOffset(MachineFunction& mcInfo,
                                      bool& pos) const
{
  mcInfo.freezeAutomaticVarsArea();     // ensure no more auto vars are added
  mcInfo.freezeSpillsArea();            // ensure no more spill slots are added
  
  pos = false;                          // static stack area grows downwards
  unsigned int autoVarsSize = mcInfo.getAutomaticVarsSize();
  unsigned int spillAreaSize = mcInfo.getRegSpillsSize();
  int offset = autoVarsSize + spillAreaSize;
  return StaticAreaOffsetFromFP - offset;
}

int
UltraSparcFrameInfo::getDynamicAreaOffset(MachineFunction& mcInfo,
                                          bool& pos) const
{
  // Dynamic stack area grows downwards starting at top of opt-args area.
  // The opt-args, required-args, and register-save areas are empty except
  // during calls and traps, so they are shifted downwards on each
  // dynamic-size alloca.
  pos = false;
  unsigned int optArgsSize = mcInfo.getMaxOptionalArgsSize();
  if (int extra = optArgsSize % getStackFrameSizeAlignment())
    optArgsSize += (getStackFrameSizeAlignment() - extra);
  int offset = optArgsSize + FirstOptionalOutgoingArgOffsetFromSP;
  assert((offset - OFFSET) % getStackFrameSizeAlignment() == 0);
  return offset;
}


//---------------------------------------------------------------------------
// class UltraSparcMachine 
// 
// Purpose:
//   Primary interface to machine description for the UltraSPARC.
//   Primarily just initializes machine-dependent parameters in
//   class TargetMachine, and creates machine-dependent subclasses
//   for classes such as MachineInstrInfo. 
// 
//---------------------------------------------------------------------------

UltraSparc::UltraSparc()
  : TargetMachine("UltraSparc-Native"),
    instrInfo(*this),
    schedInfo(*this),
    regInfo(*this),
    frameInfo(*this),
    cacheInfo(*this),
    optInfo(*this)
{
  optSizeForSubWordData = 4;
  minMemOpWordSize = 8; 
  maxAtomicMemOpWordSize = 8;
}