-//===-- Mips/MipsCodeEmitter.cpp - Convert Mips code to machine code -----===//
+//===-- Mips/MipsCodeEmitter.cpp - Convert Mips Code to Machine Code ------===//
//
// The LLVM Compiler Infrastructure
//
#define DEBUG_TYPE "jit"
#include "Mips.h"
+#include "MCTargetDesc/MipsBaseInfo.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/ADT/Statistic.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/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
+#include "llvm/CodeGen/MachineOperand.h"
#include "llvm/CodeGen/Passes.h"
-#include "llvm/ADT/Statistic.h"
+#include "llvm/IR/Constants.h"
+#include "llvm/IR/DerivedTypes.h"
+#include "llvm/PassManager.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
#include <iomanip>
#endif
-#include "llvm/CodeGen/MachineOperand.h"
-
using namespace llvm;
STATISTIC(NumEmitted, "Number of machine instructions emitted");
class MipsCodeEmitter : public MachineFunctionPass {
MipsJITInfo *JTI;
const MipsInstrInfo *II;
- const TargetData *TD;
+ const DataLayout *TD;
const MipsSubtarget *Subtarget;
TargetMachine &TM;
JITCodeEmitter &MCE;
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_) {
- }
+public:
+ MipsCodeEmitter(TargetMachine &tm, JITCodeEmitter &mce)
+ : MachineFunctionPass(ID), JTI(0), II(0), TD(0),
+ TM(tm), MCE(mce), MCPEs(0), MJTEs(0),
+ IsPIC(TM.getRelocationModel() == Reloc::PIC_) {}
- bool runOnMachineFunction(MachineFunction &MF);
+ bool runOnMachineFunction(MachineFunction &MF);
- virtual const char *getPassName() const {
- return "Mips Machine Code Emitter";
- }
+ virtual const char *getPassName() const {
+ return "Mips 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:
- /// getBinaryCodeForInstr - This function, generated by the
- /// CodeEmitterGenerator using TableGen, produces the binary encoding for
- /// machine instructions.
- unsigned getBinaryCodeForInstr(const MachineInstr &MI) const;
+ void emitWord(unsigned Word);
- void emitInstruction(const MachineInstr &MI);
+ /// Routines that handle operands which add machine relocations which are
+ /// fixed up by the relocation stage.
+ void emitGlobalAddress(const GlobalValue *GV, unsigned Reloc,
+ bool MayNeedFarStub) const;
+ void emitExternalSymbolAddress(const char *ES, unsigned Reloc) const;
+ void emitConstPoolAddress(unsigned CPI, unsigned Reloc) const;
+ void emitJumpTableAddress(unsigned JTIndex, unsigned Reloc) const;
+ void emitMachineBasicBlock(MachineBasicBlock *BB, unsigned Reloc) const;
- 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;
- void emitWordLE(unsigned Word);
+ unsigned getRelocation(const MachineInstr &MI,
+ const MachineOperand &MO) const;
- /// Routines that handle operands which add machine relocations which are
- /// fixed up by the relocation stage.
- void emitGlobalAddress(const GlobalValue *GV, unsigned Reloc,
- bool MayNeedFarStub) const;
- void emitExternalSymbolAddress(const char *ES, unsigned Reloc) const;
- void emitConstPoolAddress(unsigned CPI, unsigned Reloc) const;
- void emitJumpTableAddress(unsigned JTIndex, unsigned Reloc) const;
- void emitMachineBasicBlock(MachineBasicBlock *BB, unsigned Reloc) const;
+ unsigned getJumpTargetOpValue(const MachineInstr &MI, unsigned OpNo) const;
- /// 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 getBranchTargetOpValue(const MachineInstr &MI, unsigned OpNo) const;
+ unsigned getMemEncoding(const MachineInstr &MI, unsigned OpNo) const;
+ unsigned getMemEncodingMMImm12(const MachineInstr &MI, unsigned OpNo) const;
+ unsigned getSizeExtEncoding(const MachineInstr &MI, unsigned OpNo) const;
+ unsigned getSizeInsEncoding(const MachineInstr &MI, unsigned OpNo) const;
- unsigned getRelocation(const MachineInstr &MI,
- const MachineOperand &MO) const;
+ void emitGlobalAddressUnaligned(const GlobalValue *GV, unsigned Reloc,
+ int Offset) const;
- };
+ /// Expand pseudo instructions with accumulator register operands.
+ void expandACCInstr(MachineBasicBlock::instr_iterator MI,
+ MachineBasicBlock &MBB, unsigned Opc) const;
+
+ /// \brief Expand pseudo instruction. Return true if MI was expanded.
+ bool expandPseudos(MachineBasicBlock::instr_iterator &MI,
+ MachineBasicBlock &MBB) const;
+};
}
char MipsCodeEmitter::ID = 0;
bool MipsCodeEmitter::runOnMachineFunction(MachineFunction &MF) {
- JTI = ((MipsTargetMachine&) MF.getTarget()).getJITInfo();
- II = ((const MipsTargetMachine&) MF.getTarget()).getInstrInfo();
- TD = ((const MipsTargetMachine&) MF.getTarget()).getTargetData();
+ MipsTargetMachine &Target = static_cast<MipsTargetMachine &>(
+ const_cast<TargetMachine &>(MF.getTarget()));
+
+ JTI = Target.getJITInfo();
+ II = Target.getInstrInfo();
+ TD = Target.getDataLayout();
Subtarget = &TM.getSubtarget<MipsSubtarget> ();
MCPEs = &MF.getConstantPool()->getConstants();
MJTEs = 0;
if (MF.getJumpTableInfo()) MJTEs = &MF.getJumpTableInfo()->getJumpTables();
- JTI->Initialize(MF, IsPIC);
+ JTI->Initialize(MF, IsPIC, Subtarget->isLittle());
MCE.setModuleInfo(&getAnalysis<MachineModuleInfo> ());
do {
DEBUG(errs() << "JITTing function '"
- << MF.getFunction()->getName() << "'\n");
+ << MF.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);
+ for (MachineBasicBlock::instr_iterator I = MBB->instr_begin(),
+ E = MBB->instr_end(); I != E;)
+ emitInstruction(*I++, *MBB);
}
} while (MCE.finishFunction(MF));
if (Form == MipsII::FrmJ)
return Mips::reloc_mips_26;
if ((Form == MipsII::FrmI || Form == MipsII::FrmFI)
- && MI.getDesc().isBranch())
- return Mips::reloc_mips_branch;
+ && MI.isBranch())
+ return Mips::reloc_mips_pc16;
if (Form == MipsII::FrmI && MI.getOpcode() == Mips::LUi)
return Mips::reloc_mips_hi;
return Mips::reloc_mips_lo;
}
+unsigned MipsCodeEmitter::getJumpTargetOpValue(const MachineInstr &MI,
+ unsigned OpNo) const {
+ MachineOperand MO = MI.getOperand(OpNo);
+ if (MO.isGlobal())
+ emitGlobalAddress(MO.getGlobal(), getRelocation(MI, MO), true);
+ else if (MO.isSymbol())
+ emitExternalSymbolAddress(MO.getSymbolName(), getRelocation(MI, MO));
+ else if (MO.isMBB())
+ emitMachineBasicBlock(MO.getMBB(), getRelocation(MI, MO));
+ else
+ llvm_unreachable("Unexpected jump target operand kind.");
+ return 0;
+}
+
+unsigned MipsCodeEmitter::getBranchTargetOpValue(const MachineInstr &MI,
+ unsigned OpNo) const {
+ MachineOperand MO = MI.getOperand(OpNo);
+ emitMachineBasicBlock(MO.getMBB(), getRelocation(MI, MO));
+ return 0;
+}
+
+unsigned MipsCodeEmitter::getMemEncoding(const MachineInstr &MI,
+ unsigned OpNo) const {
+ // Base register is encoded in bits 20-16, offset is encoded in bits 15-0.
+ assert(MI.getOperand(OpNo).isReg());
+ unsigned RegBits = getMachineOpValue(MI, MI.getOperand(OpNo)) << 16;
+ return (getMachineOpValue(MI, MI.getOperand(OpNo+1)) & 0xFFFF) | RegBits;
+}
+
+unsigned MipsCodeEmitter::getMemEncodingMMImm12(const MachineInstr &MI,
+ unsigned OpNo) const {
+ llvm_unreachable("Unimplemented function.");
+ return 0;
+}
+
+unsigned MipsCodeEmitter::getSizeExtEncoding(const MachineInstr &MI,
+ unsigned OpNo) const {
+ // size is encoded as size-1.
+ return getMachineOpValue(MI, MI.getOperand(OpNo)) - 1;
+}
+
+unsigned MipsCodeEmitter::getSizeInsEncoding(const MachineInstr &MI,
+ unsigned OpNo) const {
+ // size is encoded as pos+size-1.
+ return getMachineOpValue(MI, MI.getOperand(OpNo-1)) +
+ getMachineOpValue(MI, MI.getOperand(OpNo)) - 1;
+}
+
/// getMachineOpValue - Return binary encoding of operand. If the machine
/// operand requires relocation, record the relocation and return zero.
unsigned MipsCodeEmitter::getMachineOpValue(const MachineInstr &MI,
- const MachineOperand &MO) const {
+ const MachineOperand &MO) const {
if (MO.isReg())
- return MipsRegisterInfo::getRegisterNumbering(MO.getReg());
+ return TM.getRegisterInfo()->getEncodingValue(MO.getReg());
else if (MO.isImm())
return static_cast<unsigned>(MO.getImm());
else if (MO.isGlobal())
}
void MipsCodeEmitter::emitGlobalAddress(const GlobalValue *GV, unsigned Reloc,
- bool MayNeedFarStub) const {
+ bool MayNeedFarStub) const {
MCE.addRelocation(MachineRelocation::getGV(MCE.getCurrentPCOffset(), Reloc,
- const_cast<GlobalValue *>(GV), 0, MayNeedFarStub));
+ const_cast<GlobalValue *>(GV), 0,
+ MayNeedFarStub));
+}
+
+void MipsCodeEmitter::emitGlobalAddressUnaligned(const GlobalValue *GV,
+ unsigned Reloc, int Offset) const {
+ MCE.addRelocation(MachineRelocation::getGV(MCE.getCurrentPCOffset(), Reloc,
+ const_cast<GlobalValue *>(GV), 0, false));
+ MCE.addRelocation(MachineRelocation::getGV(MCE.getCurrentPCOffset() + Offset,
+ Reloc, const_cast<GlobalValue *>(GV), 0, false));
}
void MipsCodeEmitter::
emitExternalSymbolAddress(const char *ES, unsigned Reloc) const {
MCE.addRelocation(MachineRelocation::getExtSym(MCE.getCurrentPCOffset(),
- Reloc, ES, 0, 0, false));
+ Reloc, ES, 0, 0));
}
void MipsCodeEmitter::emitConstPoolAddress(unsigned CPI, unsigned Reloc) const {
}
void MipsCodeEmitter::emitMachineBasicBlock(MachineBasicBlock *BB,
- unsigned Reloc) const {
+ unsigned Reloc) const {
MCE.addRelocation(MachineRelocation::getBB(MCE.getCurrentPCOffset(),
Reloc, BB));
}
-void MipsCodeEmitter::emitInstruction(const MachineInstr &MI) {
- DEBUG(errs() << "JIT: " << (void*)MCE.getCurrentPCValue() << ":\t" << MI);
-
- MCE.processDebugLoc(MI.getDebugLoc(), true);
+void MipsCodeEmitter::emitInstruction(MachineBasicBlock::instr_iterator MI,
+ MachineBasicBlock &MBB) {
+ DEBUG(errs() << "JIT: " << (void*)MCE.getCurrentPCValue() << ":\t" << *MI);
- // Skip pseudo instructions.
- if ((MI.getDesc().TSFlags & MipsII::FormMask) == MipsII::Pseudo)
+ // Expand pseudo instruction. Skip if MI was not expanded.
+ if (((MI->getDesc().TSFlags & MipsII::FormMask) == MipsII::Pseudo) &&
+ !expandPseudos(MI, MBB))
return;
- ++NumEmitted; // Keep track of the # of mi's emitted
+ MCE.processDebugLoc(MI->getDebugLoc(), true);
- switch (MI.getOpcode()) {
- default:
- emitWordLE(getBinaryCodeForInstr(MI));
- break;
- }
+ emitWord(getBinaryCodeForInstr(*MI));
+ ++NumEmitted; // Keep track of the # of mi's emitted
- MCE.processDebugLoc(MI.getDebugLoc(), false);
+ MCE.processDebugLoc(MI->getDebugLoc(), false);
}
-void MipsCodeEmitter::emitWordLE(unsigned Word) {
+void MipsCodeEmitter::emitWord(unsigned Word) {
DEBUG(errs() << " 0x";
errs().write_hex(Word) << "\n");
- MCE.emitWordLE(Word);
+ if (Subtarget->isLittle())
+ MCE.emitWordLE(Word);
+ else
+ MCE.emitWordBE(Word);
+}
+
+void MipsCodeEmitter::expandACCInstr(MachineBasicBlock::instr_iterator MI,
+ MachineBasicBlock &MBB,
+ unsigned Opc) const {
+ // Expand "pseudomult $ac0, $t0, $t1" to "mult $t0, $t1".
+ BuildMI(MBB, &*MI, MI->getDebugLoc(), II->get(Opc))
+ .addReg(MI->getOperand(1).getReg()).addReg(MI->getOperand(2).getReg());
+}
+
+bool MipsCodeEmitter::expandPseudos(MachineBasicBlock::instr_iterator &MI,
+ MachineBasicBlock &MBB) const {
+ switch (MI->getOpcode()) {
+ case Mips::NOP:
+ BuildMI(MBB, &*MI, MI->getDebugLoc(), II->get(Mips::SLL), Mips::ZERO)
+ .addReg(Mips::ZERO).addImm(0);
+ break;
+ case Mips::B:
+ BuildMI(MBB, &*MI, MI->getDebugLoc(), II->get(Mips::BEQ)).addReg(Mips::ZERO)
+ .addReg(Mips::ZERO).addOperand(MI->getOperand(0));
+ break;
+ case Mips::TRAP:
+ BuildMI(MBB, &*MI, MI->getDebugLoc(), II->get(Mips::BREAK)).addImm(0)
+ .addImm(0);
+ break;
+ case Mips::JALRPseudo:
+ BuildMI(MBB, &*MI, MI->getDebugLoc(), II->get(Mips::JALR), Mips::RA)
+ .addReg(MI->getOperand(0).getReg());
+ break;
+ case Mips::PseudoMULT:
+ expandACCInstr(MI, MBB, Mips::MULT);
+ break;
+ case Mips::PseudoMULTu:
+ expandACCInstr(MI, MBB, Mips::MULTu);
+ break;
+ case Mips::PseudoSDIV:
+ expandACCInstr(MI, MBB, Mips::SDIV);
+ break;
+ case Mips::PseudoUDIV:
+ expandACCInstr(MI, MBB, Mips::UDIV);
+ break;
+ case Mips::PseudoMADD:
+ expandACCInstr(MI, MBB, Mips::MADD);
+ break;
+ case Mips::PseudoMADDU:
+ expandACCInstr(MI, MBB, Mips::MADDU);
+ break;
+ case Mips::PseudoMSUB:
+ expandACCInstr(MI, MBB, Mips::MSUB);
+ break;
+ case Mips::PseudoMSUBU:
+ expandACCInstr(MI, MBB, Mips::MSUBU);
+ break;
+ default:
+ return false;
+ }
+
+ (MI--)->eraseFromBundle();
+ return true;
}
/// createMipsJITCodeEmitterPass - Return a pass that emits the collected Mips
/// code to the specified MCE object.
FunctionPass *llvm::createMipsJITCodeEmitterPass(MipsTargetMachine &TM,
- JITCodeEmitter &JCE) {
+ JITCodeEmitter &JCE) {
return new MipsCodeEmitter(TM, JCE);
}
-unsigned MipsCodeEmitter::getBinaryCodeForInstr(const MachineInstr &MI) const {
- // this function will be automatically generated by the CodeEmitterGenerator
- // using TableGen
- return 0;
-}
+#include "MipsGenCodeEmitter.inc"