-//===-- 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/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineJumpTableInfo.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");
+
namespace {
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";
+ }
- void emitInstruction(const MachineInstr &MI);
+ /// getBinaryCodeForInstr - This function, generated by the
+ /// CodeEmitterGenerator using TableGen, produces the binary encoding for
+ /// machine instructions.
+ uint64_t getBinaryCodeForInstr(const MachineInstr &MI) const;
- unsigned getOperandValue(const MachineOperand &MO,
- unsigned relocType = -1);
+ void emitInstruction(MachineBasicBlock::instr_iterator MI,
+ MachineBasicBlock &MBB);
- void emitGlobalAddress(const GlobalValue *GV, unsigned Reloc,
- bool MayNeedFarStub = true);
+private:
- void emitMachineBasicBlock(MachineBasicBlock *BB, unsigned Reloc,
- intptr_t JTBase = 0);
+ void emitWord(unsigned Word);
- void emitExternalSymbolAddress(const char *ES, unsigned Reloc);
- void emitJumpTableAddress(unsigned JTIndex, unsigned Reloc) const;
- void emitConstPoolAddress(unsigned CPI, unsigned Reloc);
-};
-}
+ /// 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;
-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);
-}
+ /// 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;
-/// 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));
-}
+ unsigned getRelocation(const MachineInstr &MI,
+ const MachineOperand &MO) const;
-void MipsCodeEmitter::emitExternalSymbolAddress(const char *ES,
- unsigned Reloc) {
- MCE.addRelocation(
- MachineRelocation::getExtSym(MCE.getCurrentPCOffset(), Reloc, ES, 0, 0,
- false));
-}
+ unsigned getJumpTargetOpValue(const MachineInstr &MI, unsigned OpNo) const;
+ unsigned getJumpTargetOpValueMM(const MachineInstr &MI, unsigned OpNo) const;
+ unsigned getBranchTargetOpValueMM(const MachineInstr &MI,
+ unsigned OpNo) const;
-void MipsCodeEmitter::emitJumpTableAddress(unsigned JTIndex, unsigned Reloc)
- const {
- MCE.addRelocation(
- MachineRelocation::getJumpTable(MCE.getCurrentPCOffset(), Reloc, JTIndex,
- 0, false));
-}
+ 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 getMSAMemEncoding(const MachineInstr &MI, unsigned OpNo) const;
+ unsigned getSizeExtEncoding(const MachineInstr &MI, unsigned OpNo) const;
+ unsigned getSizeInsEncoding(const MachineInstr &MI, unsigned OpNo) const;
+ unsigned getLSAImmEncoding(const MachineInstr &MI, unsigned OpNo) const;
-void MipsCodeEmitter::emitConstPoolAddress(unsigned CPI, unsigned Reloc) {
- MCE.addRelocation(
- MachineRelocation::getConstPool
- (MCE.getCurrentPCOffset(), Reloc, CPI, 0));
-}
+ void emitGlobalAddressUnaligned(const GlobalValue *GV, unsigned Reloc,
+ int Offset) const;
-/// 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);
+ /// 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 = 10;
+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));
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;
+unsigned MipsCodeEmitter::getRelocation(const MachineInstr &MI,
+ const MachineOperand &MO) const {
+ // NOTE: This relocations are for static.
+ uint64_t TSFlags = MI.getDesc().TSFlags;
+ uint64_t Form = TSFlags & MipsII::FormMask;
+ if (Form == MipsII::FrmJ)
+ return Mips::reloc_mips_26;
+ if ((Form == MipsII::FrmI || Form == MipsII::FrmFI)
+ && 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::getJumpTargetOpValueMM(const MachineInstr &MI,
+ unsigned OpNo) const {
+ llvm_unreachable("Unimplemented function.");
+ return 0;
+}
+
+unsigned MipsCodeEmitter::getBranchTargetOpValueMM(const MachineInstr &MI,
+ unsigned OpNo) const {
+ llvm_unreachable("Unimplemented function.");
+ 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::getMSAMemEncoding(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;
+}
+
+unsigned MipsCodeEmitter::getLSAImmEncoding(const MachineInstr &MI,
+ unsigned OpNo) const {
+ llvm_unreachable("Unimplemented function.");
+ return 0;
+}
+
+/// 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 {
+ 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), true);
+ else if (MO.isSymbol())
+ emitExternalSymbolAddress(MO.getSymbolName(), getRelocation(MI, MO));
+ else if (MO.isCPI())
+ emitConstPoolAddress(MO.getIndex(), getRelocation(MI, MO));
+ else if (MO.isJTI())
+ emitJumpTableAddress(MO.getIndex(), getRelocation(MI, MO));
+ else if (MO.isMBB())
+ emitMachineBasicBlock(MO.getMBB(), getRelocation(MI, MO));
+ else
+ llvm_unreachable("Unable to encode MachineOperand!");
+ return 0;
+}
+
+void MipsCodeEmitter::emitGlobalAddress(const GlobalValue *GV, unsigned Reloc,
+ bool MayNeedFarStub) const {
+ MCE.addRelocation(MachineRelocation::getGV(MCE.getCurrentPCOffset(), Reloc,
+ 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));
+}
+
+void MipsCodeEmitter::emitConstPoolAddress(unsigned CPI, unsigned Reloc) const {
+ MCE.addRelocation(MachineRelocation::getConstPool(MCE.getCurrentPCOffset(),
+ Reloc, CPI, 0, false));
+}
+
+void MipsCodeEmitter::
+emitJumpTableAddress(unsigned JTIndex, unsigned Reloc) const {
+ MCE.addRelocation(MachineRelocation::getJumpTable(MCE.getCurrentPCOffset(),
+ Reloc, JTIndex, 0, false));
+}
+
+void MipsCodeEmitter::emitMachineBasicBlock(MachineBasicBlock *BB,
+ unsigned Reloc) const {
+ MCE.addRelocation(MachineRelocation::getBB(MCE.getCurrentPCOffset(),
+ Reloc, BB));
+}
+
+void MipsCodeEmitter::emitInstruction(MachineBasicBlock::instr_iterator MI,
+ MachineBasicBlock &MBB) {
+ DEBUG(errs() << "JIT: " << (void*)MCE.getCurrentPCValue() << ":\t" << *MI);
+
+ // Expand pseudo instruction. Skip if MI was not expanded.
+ if (((MI->getDesc().TSFlags & MipsII::FormMask) == MipsII::Pseudo) &&
+ !expandPseudos(MI, MBB))
+ return;
+
+ MCE.processDebugLoc(MI->getDebugLoc(), true);
+
+ emitWord(getBinaryCodeForInstr(*MI));
+ ++NumEmitted; // Keep track of the # of mi's emitted
+
+ MCE.processDebugLoc(MI->getDebugLoc(), false);
+}
+
+void MipsCodeEmitter::emitWord(unsigned Word) {
+ DEBUG(errs() << " 0x";
+ errs().write_hex(Word) << "\n");
+ 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) {
+ return new MipsCodeEmitter(TM, JCE);
}
+#include "MipsGenCodeEmitter.inc"
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