llvm-6502/lib/Target/Sparc/SparcCodeEmitter.cpp

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//===-- Sparc/SparcCodeEmitter.cpp - Convert Sparc Code to Machine Code ---===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===---------------------------------------------------------------------===//
//
// This file contains the pass that transforms the Sparc machine instructions
// into relocatable machine code.
//
//===---------------------------------------------------------------------===//
#define DEBUG_TYPE "jit"
#include "Sparc.h"
#include "MCTargetDesc/SparcBaseInfo.h"
#include "SparcRelocations.h"
#include "SparcTargetMachine.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/CodeGen/JITCodeEmitter.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/Support/Debug.h"
using namespace llvm;
STATISTIC(NumEmitted, "Number of machine instructions emitted");
namespace {
class SparcCodeEmitter : public MachineFunctionPass {
SparcJITInfo *JTI;
const SparcInstrInfo *II;
const DataLayout *TD;
const SparcSubtarget *Subtarget;
TargetMachine &TM;
JITCodeEmitter &MCE;
const std::vector<MachineConstantPoolEntry> *MCPEs;
bool IsPIC;
void getAnalysisUsage(AnalysisUsage &AU) const {
AU.addRequired<MachineModuleInfo> ();
MachineFunctionPass::getAnalysisUsage(AU);
}
static char ID;
public:
SparcCodeEmitter(TargetMachine &tm, JITCodeEmitter &mce)
: MachineFunctionPass(ID), JTI(0), II(0), TD(0),
TM(tm), MCE(mce), MCPEs(0),
IsPIC(TM.getRelocationModel() == Reloc::PIC_) {}
bool runOnMachineFunction(MachineFunction &MF);
virtual const char *getPassName() const {
return "Sparc Machine Code Emitter";
}
/// getBinaryCodeForInstr - This function, generated by the
/// CodeEmitterGenerator using TableGen, produces the binary encoding for
/// machine instructions.
uint64_t getBinaryCodeForInstr(const MachineInstr &MI) const;
void emitInstruction(MachineBasicBlock::instr_iterator MI,
MachineBasicBlock &MBB);
private:
/// getMachineOpValue - Return binary encoding of operand. If the machine
/// operand requires relocation, record the relocation and return zero.
unsigned getMachineOpValue(const MachineInstr &MI,
const MachineOperand &MO) const;
unsigned getCallTargetOpValue(const MachineInstr &MI,
unsigned) const;
unsigned getBranchTargetOpValue(const MachineInstr &MI,
unsigned) const;
void emitWord(unsigned Word);
unsigned getRelocation(const MachineInstr &MI,
const MachineOperand &MO) const;
void emitGlobalAddress(const GlobalValue *GV, unsigned Reloc) const;
void emitExternalSymbolAddress(const char *ES, unsigned Reloc) const;
void emitConstPoolAddress(unsigned CPI, unsigned Reloc) const;
void emitMachineBasicBlock(MachineBasicBlock *BB, unsigned Reloc) const;
};
} // end anonymous namespace.
char SparcCodeEmitter::ID = 0;
bool SparcCodeEmitter::runOnMachineFunction(MachineFunction &MF) {
SparcTargetMachine &Target = static_cast<SparcTargetMachine &>(
const_cast<TargetMachine &>(MF.getTarget()));
JTI = Target.getJITInfo();
II = Target.getInstrInfo();
TD = Target.getDataLayout();
Subtarget = &TM.getSubtarget<SparcSubtarget> ();
MCPEs = &MF.getConstantPool()->getConstants();
JTI->Initialize(MF, IsPIC);
MCE.setModuleInfo(&getAnalysis<MachineModuleInfo> ());
do {
DEBUG(errs() << "JITTing function '"
<< MF.getName() << "'\n");
MCE.startFunction(MF);
for (MachineFunction::iterator MBB = MF.begin(), E = MF.end();
MBB != E; ++MBB){
MCE.StartMachineBasicBlock(MBB);
for (MachineBasicBlock::instr_iterator I = MBB->instr_begin(),
E = MBB->instr_end(); I != E;)
emitInstruction(*I++, *MBB);
}
} while (MCE.finishFunction(MF));
return false;
}
void SparcCodeEmitter::emitInstruction(MachineBasicBlock::instr_iterator MI,
MachineBasicBlock &MBB) {
DEBUG(errs() << "JIT: " << (void*)MCE.getCurrentPCValue() << ":\t" << *MI);
MCE.processDebugLoc(MI->getDebugLoc(), true);
++NumEmitted;
switch (MI->getOpcode()) {
default: {
emitWord(getBinaryCodeForInstr(*MI));
break;
}
case TargetOpcode::INLINEASM: {
// We allow inline assembler nodes with empty bodies - they can
// implicitly define registers, which is ok for JIT.
if (MI->getOperand(0).getSymbolName()[0]) {
report_fatal_error("JIT does not support inline asm!");
}
break;
}
case TargetOpcode::PROLOG_LABEL:
case TargetOpcode::EH_LABEL: {
MCE.emitLabel(MI->getOperand(0).getMCSymbol());
break;
}
case TargetOpcode::IMPLICIT_DEF:
case TargetOpcode::KILL: {
// Do nothing.
break;
}
case SP::GETPCX: {
report_fatal_error("JIT does not support pseudo instruction GETPCX yet!");
break;
}
}
MCE.processDebugLoc(MI->getDebugLoc(), false);
}
void SparcCodeEmitter::emitWord(unsigned Word) {
DEBUG(errs() << " 0x";
errs().write_hex(Word) << "\n");
MCE.emitWordBE(Word);
}
/// getMachineOpValue - Return binary encoding of operand. If the machine
/// operand requires relocation, record the relocation and return zero.
unsigned SparcCodeEmitter::getMachineOpValue(const MachineInstr &MI,
const MachineOperand &MO) const {
if (MO.isReg())
return TM.getRegisterInfo()->getEncodingValue(MO.getReg());
else if (MO.isImm())
return static_cast<unsigned>(MO.getImm());
else if (MO.isGlobal())
emitGlobalAddress(MO.getGlobal(), getRelocation(MI, MO));
else if (MO.isSymbol())
emitExternalSymbolAddress(MO.getSymbolName(), getRelocation(MI, MO));
else if (MO.isCPI())
emitConstPoolAddress(MO.getIndex(), getRelocation(MI, MO));
else if (MO.isMBB())
emitMachineBasicBlock(MO.getMBB(), getRelocation(MI, MO));
else
llvm_unreachable("Unable to encode MachineOperand!");
return 0;
}
unsigned SparcCodeEmitter::getCallTargetOpValue(const MachineInstr &MI,
unsigned opIdx) const {
const MachineOperand MO = MI.getOperand(opIdx);
return getMachineOpValue(MI, MO);
}
unsigned SparcCodeEmitter::getBranchTargetOpValue(const MachineInstr &MI,
unsigned opIdx) const {
const MachineOperand MO = MI.getOperand(opIdx);
return getMachineOpValue(MI, MO);
}
unsigned SparcCodeEmitter::getRelocation(const MachineInstr &MI,
const MachineOperand &MO) const {
unsigned TF = MO.getTargetFlags();
switch (TF) {
default:
case SPII::MO_NO_FLAG: break;
case SPII::MO_LO: return SP::reloc_sparc_lo;
case SPII::MO_HI: return SP::reloc_sparc_hi;
case SPII::MO_H44:
case SPII::MO_M44:
case SPII::MO_L44:
case SPII::MO_HH:
case SPII::MO_HM: assert(0 && "FIXME: Implement Medium/Large code model.");
}
unsigned Opc = MI.getOpcode();
switch (Opc) {
default: break;
case SP::CALL: return SP::reloc_sparc_pc30;
case SP::BA:
case SP::BCOND:
case SP::FBCOND: return SP::reloc_sparc_pc22;
case SP::BPXCC: return SP::reloc_sparc_pc19;
}
llvm_unreachable("unknown reloc!");
}
void SparcCodeEmitter::emitGlobalAddress(const GlobalValue *GV,
unsigned Reloc) const {
MCE.addRelocation(MachineRelocation::getGV(MCE.getCurrentPCOffset(), Reloc,
const_cast<GlobalValue *>(GV), 0,
true));
}
void SparcCodeEmitter::
emitExternalSymbolAddress(const char *ES, unsigned Reloc) const {
MCE.addRelocation(MachineRelocation::getExtSym(MCE.getCurrentPCOffset(),
Reloc, ES, 0, 0));
}
void SparcCodeEmitter::
emitConstPoolAddress(unsigned CPI, unsigned Reloc) const {
MCE.addRelocation(MachineRelocation::getConstPool(MCE.getCurrentPCOffset(),
Reloc, CPI, 0, false));
}
void SparcCodeEmitter::emitMachineBasicBlock(MachineBasicBlock *BB,
unsigned Reloc) const {
MCE.addRelocation(MachineRelocation::getBB(MCE.getCurrentPCOffset(),
Reloc, BB));
}
/// createSparcJITCodeEmitterPass - Return a pass that emits the collected Sparc
/// code to the specified MCE object.
FunctionPass *llvm::createSparcJITCodeEmitterPass(SparcTargetMachine &TM,
JITCodeEmitter &JCE) {
return new SparcCodeEmitter(TM, JCE);
}
#include "SparcGenCodeEmitter.inc"