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//===-- Mips/MipsCodeEmitter.cpp - Convert Mips 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 Mips machine instructions
// into relocatable machine code.
//
//===---------------------------------------------------------------------===//
#define DEBUG_TYPE "jit"
#include "Mips.h"
#include "MipsInstrInfo.h"
#include "MipsRelocations.h"
#include "MipsSubtarget.h"
#include "MipsTargetMachine.h"
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Function.h"
#include "llvm/PassManager.h"
#include "llvm/CodeGen/JITCodeEmitter.h"
#include "llvm/CodeGen/MachineConstantPool.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineJumpTableInfo.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/Passes.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
#ifndef NDEBUG
#include <iomanip>
#endif
#include "llvm/CodeGen/MachineOperand.h"
using namespace llvm;
namespace {
class MipsCodeEmitter : public MachineFunctionPass {
MipsJITInfo *JTI;
const MipsInstrInfo *II;
const TargetData *TD;
const MipsSubtarget *Subtarget;
TargetMachine &TM;
JITCodeEmitter &MCE;
const std::vector<MachineConstantPoolEntry> *MCPEs;
const std::vector<MachineJumpTableEntry> *MJTEs;
bool IsPIC;
void getAnalysisUsage(AnalysisUsage &AU) const {
AU.addRequired<MachineModuleInfo> ();
MachineFunctionPass::getAnalysisUsage(AU);
}
static char ID;
public:
MipsCodeEmitter(TargetMachine &tm, JITCodeEmitter &mce) :
MachineFunctionPass(ID), JTI(0),
II((const MipsInstrInfo *) tm.getInstrInfo()),
TD(tm.getTargetData()), TM(tm), MCE(mce), MCPEs(0), MJTEs(0),
IsPIC(TM.getRelocationModel() == Reloc::PIC_) {
}
bool runOnMachineFunction(MachineFunction &MF);
virtual const char *getPassName() const {
return "Mips Machine Code Emitter";
}
void emitInstruction(const MachineInstr &MI);
unsigned getOperandValue(const MachineOperand &MO,
unsigned relocType = -1);
void emitGlobalAddress(const GlobalValue *GV, unsigned Reloc,
bool MayNeedFarStub = true);
void emitMachineBasicBlock(MachineBasicBlock *BB, unsigned Reloc,
intptr_t JTBase = 0);
void emitExternalSymbolAddress(const char *ES, unsigned Reloc);
void emitJumpTableAddress(unsigned JTIndex, unsigned Reloc) const;
void emitConstPoolAddress(unsigned CPI, unsigned Reloc);
};
}
void MipsCodeEmitter::emitGlobalAddress(const GlobalValue *GV, unsigned Reloc,
bool mayNeedFarStub) {
MachineRelocation MR = MachineRelocation::getGV(MCE.getCurrentPCOffset(),
Reloc, const_cast<GlobalValue *> (GV), 0, mayNeedFarStub);
MCE.addRelocation(MR);
}
/// emitMachineBasicBlock - Emit the specified address basic block.
void MipsCodeEmitter::emitMachineBasicBlock(MachineBasicBlock *BB,
unsigned Reloc, intptr_t JTBase) {
MCE.addRelocation(
MachineRelocation::getBB(MCE.getCurrentPCOffset(), Reloc, BB, JTBase));
}
void MipsCodeEmitter::emitExternalSymbolAddress(const char *ES,
unsigned Reloc) {
MCE.addRelocation(
MachineRelocation::getExtSym(MCE.getCurrentPCOffset(), Reloc, ES, 0, 0,
false));
}
void MipsCodeEmitter::emitJumpTableAddress(unsigned JTIndex, unsigned Reloc)
const {
MCE.addRelocation(
MachineRelocation::getJumpTable(MCE.getCurrentPCOffset(), Reloc, JTIndex,
0, false));
}
void MipsCodeEmitter::emitConstPoolAddress(unsigned CPI, unsigned Reloc) {
MCE.addRelocation(
MachineRelocation::getConstPool
(MCE.getCurrentPCOffset(), Reloc, CPI, 0));
}
/// createMipsJITCodeEmitterPass - Return a pass that emits the collected Mips
/// code to the specified MCE object.
FunctionPass *llvm::createMipsJITCodeEmitterPass(MipsTargetMachine &TM,
JITCodeEmitter &JCE) {
return new MipsCodeEmitter(TM, JCE);
}
char MipsCodeEmitter::ID = 10;
bool MipsCodeEmitter::runOnMachineFunction(MachineFunction &MF) {
JTI = ((MipsTargetMachine&) MF.getTarget()).getJITInfo();
II = ((const MipsTargetMachine&) MF.getTarget()).getInstrInfo();
TD = ((const MipsTargetMachine&) MF.getTarget()).getTargetData();
Subtarget = &TM.getSubtarget<MipsSubtarget> ();
MCPEs = &MF.getConstantPool()->getConstants();
MJTEs = 0;
if (MF.getJumpTableInfo()) MJTEs = &MF.getJumpTableInfo()->getJumpTables();
JTI->Initialize(MF, IsPIC);
MCE.setModuleInfo(&getAnalysis<MachineModuleInfo> ());
do {
DEBUG(errs() << "JITTing function '"
<< MF.getFunction()->getName() << "'\n");
MCE.startFunction(MF);
for (MachineFunction::iterator MBB = MF.begin(), E = MF.end();
MBB != E; ++MBB){
MCE.StartMachineBasicBlock(MBB);
for (MachineBasicBlock::const_iterator I = MBB->begin(), E = MBB->end();
I != E; ++I)
emitInstruction(*I);
}
} while (MCE.finishFunction(MF));
return false;
}
void MipsCodeEmitter::emitInstruction(const MachineInstr &MI) {}
unsigned MipsCodeEmitter::getOperandValue(const MachineOperand &MO,
unsigned relocType) {
switch (MO.getType()) {
case MachineOperand::MO_Immediate:
return MO.getImm();
case MachineOperand::MO_GlobalAddress:
emitGlobalAddress(MO.getGlobal(), relocType, false);
return 0;
case MachineOperand::MO_ExternalSymbol:
emitExternalSymbolAddress(MO.getSymbolName(), relocType);
return 0;
case MachineOperand::MO_MachineBasicBlock:
emitMachineBasicBlock(MO.getMBB(), relocType, MCE.getCurrentPCValue());
return 0;
case MachineOperand::MO_Register:
return MipsRegisterInfo::getRegisterNumbering(MO.getReg());
case MachineOperand::MO_JumpTableIndex:
emitJumpTableAddress(MO.getIndex(), relocType);
return 0;
case MachineOperand::MO_ConstantPoolIndex:
emitConstPoolAddress(MO.getIndex(), relocType);
return 0;
default: return 0;
}
}
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