#include "llvm/CodeGen/Passes.h"
#include "llvm/Function.h"
#include "llvm/ADT/Statistic.h"
+#include "llvm/MC/MCCodeEmitter.h"
+#include "llvm/MC/MCExpr.h"
+#include "llvm/MC/MCInst.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
STATISTIC(NumEmitted, "Number of machine instructions emitted");
namespace {
-template<class CodeEmitter>
+ template<class CodeEmitter>
class VISIBILITY_HIDDEN Emitter : public MachineFunctionPass {
const X86InstrInfo *II;
const TargetData *TD;
template<class CodeEmitter>
char Emitter<CodeEmitter>::ID = 0;
-}
+} // end anonymous namespace.
/// createX86CodeEmitterPass - Return a pass that emits the collected X86 code
/// to the specified templated MachineCodeEmitter object.
// Otherwise, this is something that requires a relocation. Emit it as such
// now.
+ unsigned RelocType = Is64BitMode ?
+ (IsPCRel ? X86::reloc_pcrel_word : X86::reloc_absolute_word_sext)
+ : (IsPIC ? X86::reloc_picrel_word : X86::reloc_absolute_word);
if (RelocOp->isGlobal()) {
// In 64-bit static small code model, we could potentially emit absolute.
// But it's probably not beneficial. If the MCE supports using RIP directly
// do it, otherwise fallback to absolute (this is determined by IsPCRel).
// 89 05 00 00 00 00 mov %eax,0(%rip) # PC-relative
// 89 04 25 00 00 00 00 mov %eax,0x0 # Absolute
- unsigned rt = Is64BitMode ?
- (IsPCRel ? X86::reloc_pcrel_word : X86::reloc_absolute_word_sext)
- : (IsPIC ? X86::reloc_picrel_word : X86::reloc_absolute_word);
bool NeedStub = isa<Function>(RelocOp->getGlobal());
bool Indirect = gvNeedsNonLazyPtr(*RelocOp, TM);
- emitGlobalAddress(RelocOp->getGlobal(), rt, RelocOp->getOffset(),
+ emitGlobalAddress(RelocOp->getGlobal(), RelocType, RelocOp->getOffset(),
Adj, NeedStub, Indirect);
+ } else if (RelocOp->isSymbol()) {
+ emitExternalSymbolAddress(RelocOp->getSymbolName(), RelocType);
} else if (RelocOp->isCPI()) {
- unsigned rt = Is64BitMode ?
- (IsPCRel ? X86::reloc_pcrel_word : X86::reloc_absolute_word_sext)
- : (IsPCRel ? X86::reloc_picrel_word : X86::reloc_absolute_word);
- emitConstPoolAddress(RelocOp->getIndex(), rt,
+ emitConstPoolAddress(RelocOp->getIndex(), RelocType,
RelocOp->getOffset(), Adj);
- } else if (RelocOp->isJTI()) {
- unsigned rt = Is64BitMode ?
- (IsPCRel ? X86::reloc_pcrel_word : X86::reloc_absolute_word_sext)
- : (IsPCRel ? X86::reloc_picrel_word : X86::reloc_absolute_word);
- emitJumpTableAddress(RelocOp->getIndex(), rt, Adj);
} else {
- llvm_unreachable("Unknown value to relocate!");
+ assert(RelocOp->isJTI() && "Unexpected machine operand!");
+ emitJumpTableAddress(RelocOp->getIndex(), RelocType, Adj);
}
}
template<class CodeEmitter>
void Emitter<CodeEmitter>::emitMemModRMByte(const MachineInstr &MI,
- unsigned Op, unsigned RegOpcodeField,
- intptr_t PCAdj) {
+ unsigned Op,unsigned RegOpcodeField,
+ intptr_t PCAdj) {
const MachineOperand &Op3 = MI.getOperand(Op+3);
int DispVal = 0;
const MachineOperand *DispForReloc = 0;
// Figure out what sort of displacement we have to handle here.
if (Op3.isGlobal()) {
DispForReloc = &Op3;
+ } else if (Op3.isSymbol()) {
+ DispForReloc = &Op3;
} else if (Op3.isCPI()) {
if (!MCE.earlyResolveAddresses() || Is64BitMode || IsPIC) {
DispForReloc = &Op3;
}
template<class CodeEmitter>
-void Emitter<CodeEmitter>::emitInstruction(
- const MachineInstr &MI,
- const TargetInstrDesc *Desc) {
+void Emitter<CodeEmitter>::emitInstruction(const MachineInstr &MI,
+ const TargetInstrDesc *Desc) {
DEBUG(errs() << MI);
MCE.processDebugLoc(MI.getDebugLoc());
unsigned Opcode = Desc->Opcode;
// Emit the lock opcode prefix as needed.
- if (Desc->TSFlags & X86II::LOCK) MCE.emitByte(0xF0);
+ if (Desc->TSFlags & X86II::LOCK)
+ MCE.emitByte(0xF0);
// Emit segment override opcode prefix as needed.
switch (Desc->TSFlags & X86II::SegOvrMask) {
}
// Emit the repeat opcode prefix as needed.
- if ((Desc->TSFlags & X86II::Op0Mask) == X86II::REP) MCE.emitByte(0xF3);
+ if ((Desc->TSFlags & X86II::Op0Mask) == X86II::REP)
+ MCE.emitByte(0xF3);
// Emit the operand size opcode prefix as needed.
- if (Desc->TSFlags & X86II::OpSize) MCE.emitByte(0x66);
+ if (Desc->TSFlags & X86II::OpSize)
+ MCE.emitByte(0x66);
// Emit the address size opcode prefix as needed.
- if (Desc->TSFlags & X86II::AdSize) MCE.emitByte(0x67);
+ if (Desc->TSFlags & X86II::AdSize)
+ MCE.emitByte(0x67);
bool Need0FPrefix = false;
switch (Desc->TSFlags & X86II::Op0Mask) {
case 0: break; // No prefix!
}
+ // Handle REX prefix.
if (Is64BitMode) {
- // REX prefix
- unsigned REX = X86InstrInfo::determineREX(MI);
- if (REX)
+ if (unsigned REX = X86InstrInfo::determineREX(MI))
MCE.emitByte(0x40 | REX);
}
MCE.emitByte(0x0F);
switch (Desc->TSFlags & X86II::Op0Mask) {
- case X86II::TF: // F2 0F 38
- case X86II::T8: // 0F 38
+ case X86II::TF: // F2 0F 38
+ case X86II::T8: // 0F 38
MCE.emitByte(0x38);
break;
case X86II::TA: // 0F 3A
unsigned char BaseOpcode = II->getBaseOpcodeFor(Desc);
switch (Desc->TSFlags & X86II::FormMask) {
- default: llvm_unreachable("Unknown FormMask value in X86 MachineCodeEmitter!");
+ default:
+ llvm_unreachable("Unknown FormMask value in X86 MachineCodeEmitter!");
case X86II::Pseudo:
// Remember the current PC offset, this is the PIC relocation
// base address.
switch (Opcode) {
default:
- llvm_unreachable("psuedo instructions should be removed before code emission");
+ llvm_unreachable("psuedo instructions should be removed before code"
+ " emission");
break;
- case TargetInstrInfo::INLINEASM: {
+ case TargetInstrInfo::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]) {
- llvm_report_error("JIT does not support inline asm!");
- }
+ assert(MI.getOperand(0).getSymbolName()[0] == 0 &&
+ "JIT does not support inline asm!");
break;
- }
case TargetInstrInfo::DBG_LABEL:
case TargetInstrInfo::EH_LABEL:
+ case TargetInstrInfo::GC_LABEL:
MCE.emitLabel(MI.getOperand(0).getImm());
break;
case TargetInstrInfo::IMPLICIT_DEF:
- case TargetInstrInfo::DECLARE:
case X86::DWARF_LOC:
case X86::FP_REG_KILL:
break;
}
CurOp = NumOps;
break;
- case X86II::RawFrm:
+ case X86II::RawFrm: {
MCE.emitByte(BaseOpcode);
- if (CurOp != NumOps) {
- const MachineOperand &MO = MI.getOperand(CurOp++);
-
- DEBUG(errs() << "RawFrm CurOp " << CurOp << "\n");
- DEBUG(errs() << "isMBB " << MO.isMBB() << "\n");
- DEBUG(errs() << "isGlobal " << MO.isGlobal() << "\n");
- DEBUG(errs() << "isSymbol " << MO.isSymbol() << "\n");
- DEBUG(errs() << "isImm " << MO.isImm() << "\n");
-
- if (MO.isMBB()) {
- emitPCRelativeBlockAddress(MO.getMBB());
- } else if (MO.isGlobal()) {
- // Assume undefined functions may be outside the Small codespace.
- bool NeedStub =
- (Is64BitMode &&
- (TM.getCodeModel() == CodeModel::Large ||
- TM.getSubtarget<X86Subtarget>().isTargetDarwin())) ||
- Opcode == X86::TAILJMPd;
- emitGlobalAddress(MO.getGlobal(), X86::reloc_pcrel_word,
- MO.getOffset(), 0, NeedStub);
- } else if (MO.isSymbol()) {
- emitExternalSymbolAddress(MO.getSymbolName(), X86::reloc_pcrel_word);
- } else if (MO.isImm()) {
- if (Opcode == X86::CALLpcrel32 || Opcode == X86::CALL64pcrel32) {
- // Fix up immediate operand for pc relative calls.
- intptr_t Imm = (intptr_t)MO.getImm();
- Imm = Imm - MCE.getCurrentPCValue() - 4;
- emitConstant(Imm, X86InstrInfo::sizeOfImm(Desc));
- } else
- emitConstant(MO.getImm(), X86InstrInfo::sizeOfImm(Desc));
- } else {
- llvm_unreachable("Unknown RawFrm operand!");
- }
+ if (CurOp == NumOps)
+ break;
+
+ const MachineOperand &MO = MI.getOperand(CurOp++);
+
+ DEBUG(errs() << "RawFrm CurOp " << CurOp << "\n");
+ DEBUG(errs() << "isMBB " << MO.isMBB() << "\n");
+ DEBUG(errs() << "isGlobal " << MO.isGlobal() << "\n");
+ DEBUG(errs() << "isSymbol " << MO.isSymbol() << "\n");
+ DEBUG(errs() << "isImm " << MO.isImm() << "\n");
+
+ if (MO.isMBB()) {
+ emitPCRelativeBlockAddress(MO.getMBB());
+ break;
}
+
+ if (MO.isGlobal()) {
+ // Assume undefined functions may be outside the Small codespace.
+ bool NeedStub =
+ (Is64BitMode &&
+ (TM.getCodeModel() == CodeModel::Large ||
+ TM.getSubtarget<X86Subtarget>().isTargetDarwin())) ||
+ Opcode == X86::TAILJMPd;
+ emitGlobalAddress(MO.getGlobal(), X86::reloc_pcrel_word,
+ MO.getOffset(), 0, NeedStub);
+ break;
+ }
+
+ if (MO.isSymbol()) {
+ emitExternalSymbolAddress(MO.getSymbolName(), X86::reloc_pcrel_word);
+ break;
+ }
+
+ assert(MO.isImm() && "Unknown RawFrm operand!");
+ if (Opcode == X86::CALLpcrel32 || Opcode == X86::CALL64pcrel32) {
+ // Fix up immediate operand for pc relative calls.
+ intptr_t Imm = (intptr_t)MO.getImm();
+ Imm = Imm - MCE.getCurrentPCValue() - 4;
+ emitConstant(Imm, X86InstrInfo::sizeOfImm(Desc));
+ } else
+ emitConstant(MO.getImm(), X86InstrInfo::sizeOfImm(Desc));
break;
-
- case X86II::AddRegFrm:
+ }
+
+ case X86II::AddRegFrm: {
MCE.emitByte(BaseOpcode + getX86RegNum(MI.getOperand(CurOp++).getReg()));
- if (CurOp != NumOps) {
- const MachineOperand &MO1 = MI.getOperand(CurOp++);
- unsigned Size = X86InstrInfo::sizeOfImm(Desc);
- if (MO1.isImm())
- emitConstant(MO1.getImm(), Size);
- else {
- unsigned rt = Is64BitMode ? X86::reloc_pcrel_word
- : (IsPIC ? X86::reloc_picrel_word : X86::reloc_absolute_word);
- if (Opcode == X86::MOV64ri64i32)
- rt = X86::reloc_absolute_word; // FIXME: add X86II flag?
- // This should not occur on Darwin for relocatable objects.
- if (Opcode == X86::MOV64ri)
- rt = X86::reloc_absolute_dword; // FIXME: add X86II flag?
- if (MO1.isGlobal()) {
- bool NeedStub = isa<Function>(MO1.getGlobal());
- bool Indirect = gvNeedsNonLazyPtr(MO1, TM);
- emitGlobalAddress(MO1.getGlobal(), rt, MO1.getOffset(), 0,
- NeedStub, Indirect);
- } else if (MO1.isSymbol())
- emitExternalSymbolAddress(MO1.getSymbolName(), rt);
- else if (MO1.isCPI())
- emitConstPoolAddress(MO1.getIndex(), rt);
- else if (MO1.isJTI())
- emitJumpTableAddress(MO1.getIndex(), rt);
- }
+ if (CurOp == NumOps)
+ break;
+
+ const MachineOperand &MO1 = MI.getOperand(CurOp++);
+ unsigned Size = X86InstrInfo::sizeOfImm(Desc);
+ if (MO1.isImm()) {
+ emitConstant(MO1.getImm(), Size);
+ break;
}
+
+ unsigned rt = Is64BitMode ? X86::reloc_pcrel_word
+ : (IsPIC ? X86::reloc_picrel_word : X86::reloc_absolute_word);
+ if (Opcode == X86::MOV64ri64i32)
+ rt = X86::reloc_absolute_word; // FIXME: add X86II flag?
+ // This should not occur on Darwin for relocatable objects.
+ if (Opcode == X86::MOV64ri)
+ rt = X86::reloc_absolute_dword; // FIXME: add X86II flag?
+ if (MO1.isGlobal()) {
+ bool NeedStub = isa<Function>(MO1.getGlobal());
+ bool Indirect = gvNeedsNonLazyPtr(MO1, TM);
+ emitGlobalAddress(MO1.getGlobal(), rt, MO1.getOffset(), 0,
+ NeedStub, Indirect);
+ } else if (MO1.isSymbol())
+ emitExternalSymbolAddress(MO1.getSymbolName(), rt);
+ else if (MO1.isCPI())
+ emitConstPoolAddress(MO1.getIndex(), rt);
+ else if (MO1.isJTI())
+ emitJumpTableAddress(MO1.getIndex(), rt);
break;
+ }
case X86II::MRMDestReg: {
MCE.emitByte(BaseOpcode);
getX86RegNum(MI.getOperand(CurOp+1).getReg()));
CurOp += 2;
if (CurOp != NumOps)
- emitConstant(MI.getOperand(CurOp++).getImm(), X86InstrInfo::sizeOfImm(Desc));
+ emitConstant(MI.getOperand(CurOp++).getImm(),
+ X86InstrInfo::sizeOfImm(Desc));
break;
}
case X86II::MRMDestMem: {
.getReg()));
CurOp += X86AddrNumOperands + 1;
if (CurOp != NumOps)
- emitConstant(MI.getOperand(CurOp++).getImm(), X86InstrInfo::sizeOfImm(Desc));
+ emitConstant(MI.getOperand(CurOp++).getImm(),
+ X86InstrInfo::sizeOfImm(Desc));
break;
}
(Desc->TSFlags & X86II::FormMask)-X86II::MRM0r);
}
- if (CurOp != NumOps) {
- const MachineOperand &MO1 = MI.getOperand(CurOp++);
- unsigned Size = X86InstrInfo::sizeOfImm(Desc);
- if (MO1.isImm())
- emitConstant(MO1.getImm(), Size);
- else {
- unsigned rt = Is64BitMode ? X86::reloc_pcrel_word
- : (IsPIC ? X86::reloc_picrel_word : X86::reloc_absolute_word);
- if (Opcode == X86::MOV64ri32)
- rt = X86::reloc_absolute_word_sext; // FIXME: add X86II flag?
- if (MO1.isGlobal()) {
- bool NeedStub = isa<Function>(MO1.getGlobal());
- bool Indirect = gvNeedsNonLazyPtr(MO1, TM);
- emitGlobalAddress(MO1.getGlobal(), rt, MO1.getOffset(), 0,
- NeedStub, Indirect);
- } else if (MO1.isSymbol())
- emitExternalSymbolAddress(MO1.getSymbolName(), rt);
- else if (MO1.isCPI())
- emitConstPoolAddress(MO1.getIndex(), rt);
- else if (MO1.isJTI())
- emitJumpTableAddress(MO1.getIndex(), rt);
- }
+ if (CurOp == NumOps)
+ break;
+
+ const MachineOperand &MO1 = MI.getOperand(CurOp++);
+ unsigned Size = X86InstrInfo::sizeOfImm(Desc);
+ if (MO1.isImm()) {
+ emitConstant(MO1.getImm(), Size);
+ break;
}
+
+ unsigned rt = Is64BitMode ? X86::reloc_pcrel_word
+ : (IsPIC ? X86::reloc_picrel_word : X86::reloc_absolute_word);
+ if (Opcode == X86::MOV64ri32)
+ rt = X86::reloc_absolute_word_sext; // FIXME: add X86II flag?
+ if (MO1.isGlobal()) {
+ bool NeedStub = isa<Function>(MO1.getGlobal());
+ bool Indirect = gvNeedsNonLazyPtr(MO1, TM);
+ emitGlobalAddress(MO1.getGlobal(), rt, MO1.getOffset(), 0,
+ NeedStub, Indirect);
+ } else if (MO1.isSymbol())
+ emitExternalSymbolAddress(MO1.getSymbolName(), rt);
+ else if (MO1.isCPI())
+ emitConstPoolAddress(MO1.getIndex(), rt);
+ else if (MO1.isJTI())
+ emitJumpTableAddress(MO1.getIndex(), rt);
break;
}
PCAdj);
CurOp += X86AddrNumOperands;
- if (CurOp != NumOps) {
- const MachineOperand &MO = MI.getOperand(CurOp++);
- unsigned Size = X86InstrInfo::sizeOfImm(Desc);
- if (MO.isImm())
- emitConstant(MO.getImm(), Size);
- else {
- unsigned rt = Is64BitMode ? X86::reloc_pcrel_word
- : (IsPIC ? X86::reloc_picrel_word : X86::reloc_absolute_word);
- if (Opcode == X86::MOV64mi32)
- rt = X86::reloc_absolute_word_sext; // FIXME: add X86II flag?
- if (MO.isGlobal()) {
- bool NeedStub = isa<Function>(MO.getGlobal());
- bool Indirect = gvNeedsNonLazyPtr(MO, TM);
- emitGlobalAddress(MO.getGlobal(), rt, MO.getOffset(), 0,
- NeedStub, Indirect);
- } else if (MO.isSymbol())
- emitExternalSymbolAddress(MO.getSymbolName(), rt);
- else if (MO.isCPI())
- emitConstPoolAddress(MO.getIndex(), rt);
- else if (MO.isJTI())
- emitJumpTableAddress(MO.getIndex(), rt);
- }
+ if (CurOp == NumOps)
+ break;
+
+ const MachineOperand &MO = MI.getOperand(CurOp++);
+ unsigned Size = X86InstrInfo::sizeOfImm(Desc);
+ if (MO.isImm()) {
+ emitConstant(MO.getImm(), Size);
+ break;
}
+
+ unsigned rt = Is64BitMode ? X86::reloc_pcrel_word
+ : (IsPIC ? X86::reloc_picrel_word : X86::reloc_absolute_word);
+ if (Opcode == X86::MOV64mi32)
+ rt = X86::reloc_absolute_word_sext; // FIXME: add X86II flag?
+ if (MO.isGlobal()) {
+ bool NeedStub = isa<Function>(MO.getGlobal());
+ bool Indirect = gvNeedsNonLazyPtr(MO, TM);
+ emitGlobalAddress(MO.getGlobal(), rt, MO.getOffset(), 0,
+ NeedStub, Indirect);
+ } else if (MO.isSymbol())
+ emitExternalSymbolAddress(MO.getSymbolName(), rt);
+ else if (MO.isCPI())
+ emitConstPoolAddress(MO.getIndex(), rt);
+ else if (MO.isJTI())
+ emitJumpTableAddress(MO.getIndex(), rt);
break;
}
if (!Desc->isVariadic() && CurOp != NumOps) {
#ifndef NDEBUG
- errs() << "Cannot encode: " << MI << "\n";
+ errs() << "Cannot encode all operands of: " << MI << "\n";
#endif
llvm_unreachable(0);
}
}
+
+// Adapt the Emitter / CodeEmitter interfaces to MCCodeEmitter.
+//
+// FIXME: This is a total hack designed to allow work on llvm-mc to proceed
+// without being blocked on various cleanups needed to support a clean interface
+// to instruction encoding.
+//
+// Look away!
+
+#include "llvm/DerivedTypes.h"
+
+namespace {
+class MCSingleInstructionCodeEmitter : public MachineCodeEmitter {
+ uint8_t Data[256];
+
+public:
+ MCSingleInstructionCodeEmitter() { reset(); }
+
+ void reset() {
+ BufferBegin = Data;
+ BufferEnd = array_endof(Data);
+ CurBufferPtr = Data;
+ }
+
+ StringRef str() {
+ return StringRef(reinterpret_cast<char*>(BufferBegin),
+ CurBufferPtr - BufferBegin);
+ }
+
+ virtual void startFunction(MachineFunction &F) {}
+ virtual bool finishFunction(MachineFunction &F) { return false; }
+ virtual void emitLabel(uint64_t LabelID) {}
+ virtual void StartMachineBasicBlock(MachineBasicBlock *MBB) {}
+ virtual bool earlyResolveAddresses() const { return false; }
+ virtual void addRelocation(const MachineRelocation &MR) { }
+ virtual uintptr_t getConstantPoolEntryAddress(unsigned Index) const {
+ return 0;
+ }
+ virtual uintptr_t getJumpTableEntryAddress(unsigned Index) const {
+ return 0;
+ }
+ virtual uintptr_t getMachineBasicBlockAddress(MachineBasicBlock *MBB) const {
+ return 0;
+ }
+ virtual uintptr_t getLabelAddress(uint64_t LabelID) const {
+ return 0;
+ }
+ virtual void setModuleInfo(MachineModuleInfo* Info) {}
+};
+
+class X86MCCodeEmitter : public MCCodeEmitter {
+ X86MCCodeEmitter(const X86MCCodeEmitter &); // DO NOT IMPLEMENT
+ void operator=(const X86MCCodeEmitter &); // DO NOT IMPLEMENT
+
+private:
+ X86TargetMachine &TM;
+ llvm::Function *DummyF;
+ TargetData *DummyTD;
+ mutable llvm::MachineFunction *DummyMF;
+ llvm::MachineBasicBlock *DummyMBB;
+
+ MCSingleInstructionCodeEmitter *InstrEmitter;
+ Emitter<MachineCodeEmitter> *Emit;
+
+public:
+ X86MCCodeEmitter(X86TargetMachine &_TM) : TM(_TM) {
+ // Verily, thou shouldst avert thine eyes.
+ const llvm::FunctionType *FTy =
+ FunctionType::get(llvm::Type::getVoidTy(getGlobalContext()), false);
+ DummyF = Function::Create(FTy, GlobalValue::InternalLinkage);
+ DummyTD = new TargetData("");
+ DummyMF = new MachineFunction(DummyF, TM);
+ DummyMBB = DummyMF->CreateMachineBasicBlock();
+
+ InstrEmitter = new MCSingleInstructionCodeEmitter();
+ Emit = new Emitter<MachineCodeEmitter>(TM, *InstrEmitter,
+ *TM.getInstrInfo(),
+ *DummyTD, false);
+ }
+ ~X86MCCodeEmitter() {
+ delete Emit;
+ delete InstrEmitter;
+ delete DummyMF;
+ delete DummyF;
+ }
+
+ bool AddRegToInstr(const MCInst &MI, MachineInstr *Instr,
+ unsigned Start) const {
+ if (Start + 1 > MI.getNumOperands())
+ return false;
+
+ const MCOperand &Op = MI.getOperand(Start);
+ if (!Op.isReg()) return false;
+
+ Instr->addOperand(MachineOperand::CreateReg(Op.getReg(), false));
+ return true;
+ }
+
+ bool AddImmToInstr(const MCInst &MI, MachineInstr *Instr,
+ unsigned Start) const {
+ if (Start + 1 > MI.getNumOperands())
+ return false;
+
+ const MCOperand &Op = MI.getOperand(Start);
+ if (Op.isImm()) {
+ Instr->addOperand(MachineOperand::CreateImm(Op.getImm()));
+ return true;
+ }
+ if (!Op.isExpr())
+ return false;
+
+ const MCExpr *Expr = Op.getExpr();
+ if (const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(Expr)) {
+ Instr->addOperand(MachineOperand::CreateImm(CE->getValue()));
+ return true;
+ }
+
+ // FIXME: Relocation / fixup.
+ Instr->addOperand(MachineOperand::CreateImm(0));
+ return true;
+ }
+
+ bool AddLMemToInstr(const MCInst &MI, MachineInstr *Instr,
+ unsigned Start) const {
+ return (AddRegToInstr(MI, Instr, Start + 0) &&
+ AddImmToInstr(MI, Instr, Start + 1) &&
+ AddRegToInstr(MI, Instr, Start + 2) &&
+ AddImmToInstr(MI, Instr, Start + 3));
+ }
+
+ bool AddMemToInstr(const MCInst &MI, MachineInstr *Instr,
+ unsigned Start) const {
+ return (AddRegToInstr(MI, Instr, Start + 0) &&
+ AddImmToInstr(MI, Instr, Start + 1) &&
+ AddRegToInstr(MI, Instr, Start + 2) &&
+ AddImmToInstr(MI, Instr, Start + 3) &&
+ AddRegToInstr(MI, Instr, Start + 4));
+ }
+
+ void EncodeInstruction(const MCInst &MI, raw_ostream &OS) const {
+ // Don't look yet!
+
+ // Convert the MCInst to a MachineInstr so we can (ab)use the regular
+ // emitter.
+ const X86InstrInfo &II = *TM.getInstrInfo();
+ const TargetInstrDesc &Desc = II.get(MI.getOpcode());
+ MachineInstr *Instr = DummyMF->CreateMachineInstr(Desc, DebugLoc());
+ DummyMBB->push_back(Instr);
+
+ unsigned Opcode = MI.getOpcode();
+ unsigned NumOps = MI.getNumOperands();
+ unsigned CurOp = 0;
+ if (NumOps > 1 && Desc.getOperandConstraint(1, TOI::TIED_TO) != -1) {
+ Instr->addOperand(MachineOperand::CreateReg(0, false));
+ ++CurOp;
+ } else if (NumOps > 2 &&
+ Desc.getOperandConstraint(NumOps-1, TOI::TIED_TO)== 0)
+ // Skip the last source operand that is tied_to the dest reg. e.g. LXADD32
+ --NumOps;
+
+ bool OK = true;
+ switch (Desc.TSFlags & X86II::FormMask) {
+ case X86II::MRMDestReg:
+ case X86II::MRMSrcReg:
+ // Matching doesn't fill this in completely, we have to choose operand 0
+ // for a tied register.
+ OK &= AddRegToInstr(MI, Instr, 0); CurOp++;
+ OK &= AddRegToInstr(MI, Instr, CurOp++);
+ if (CurOp < NumOps)
+ OK &= AddImmToInstr(MI, Instr, CurOp);
+ break;
+
+ case X86II::RawFrm:
+ if (CurOp < NumOps) {
+ // Hack to make branches work.
+ if (!(Desc.TSFlags & X86II::ImmMask) &&
+ MI.getOperand(0).isExpr() &&
+ isa<MCSymbolRefExpr>(MI.getOperand(0).getExpr()))
+ Instr->addOperand(MachineOperand::CreateMBB(DummyMBB));
+ else
+ OK &= AddImmToInstr(MI, Instr, CurOp);
+ }
+ break;
+
+ case X86II::AddRegFrm:
+ OK &= AddRegToInstr(MI, Instr, CurOp++);
+ if (CurOp < NumOps)
+ OK &= AddImmToInstr(MI, Instr, CurOp);
+ break;
+
+ case X86II::MRM0r: case X86II::MRM1r:
+ case X86II::MRM2r: case X86II::MRM3r:
+ case X86II::MRM4r: case X86II::MRM5r:
+ case X86II::MRM6r: case X86II::MRM7r:
+ // Matching doesn't fill this in completely, we have to choose operand 0
+ // for a tied register.
+ OK &= AddRegToInstr(MI, Instr, 0); CurOp++;
+ if (CurOp < NumOps)
+ OK &= AddImmToInstr(MI, Instr, CurOp);
+ break;
+
+ case X86II::MRM0m: case X86II::MRM1m:
+ case X86II::MRM2m: case X86II::MRM3m:
+ case X86II::MRM4m: case X86II::MRM5m:
+ case X86II::MRM6m: case X86II::MRM7m:
+ OK &= AddMemToInstr(MI, Instr, CurOp); CurOp += 5;
+ if (CurOp < NumOps)
+ OK &= AddImmToInstr(MI, Instr, CurOp);
+ break;
+
+ case X86II::MRMSrcMem:
+ OK &= AddRegToInstr(MI, Instr, CurOp++);
+ if (Opcode == X86::LEA64r || Opcode == X86::LEA64_32r ||
+ Opcode == X86::LEA16r || Opcode == X86::LEA32r)
+ OK &= AddLMemToInstr(MI, Instr, CurOp);
+ else
+ OK &= AddMemToInstr(MI, Instr, CurOp);
+ break;
+
+ case X86II::MRMDestMem:
+ OK &= AddMemToInstr(MI, Instr, CurOp); CurOp += 5;
+ OK &= AddRegToInstr(MI, Instr, CurOp);
+ break;
+
+ default:
+ case X86II::MRMInitReg:
+ case X86II::Pseudo:
+ OK = false;
+ break;
+ }
+
+ if (!OK) {
+ errs() << "couldn't convert inst '";
+ MI.dump();
+ errs() << "' to machine instr:\n";
+ Instr->dump();
+ }
+
+ InstrEmitter->reset();
+ if (OK)
+ Emit->emitInstruction(*Instr, &Desc);
+ OS << InstrEmitter->str();
+
+ Instr->eraseFromParent();
+ }
+};
+}
+
+// Ok, now you can look.
+MCCodeEmitter *llvm::createX86MCCodeEmitter(const Target &,
+ TargetMachine &TM) {
+ return new X86MCCodeEmitter(static_cast<X86TargetMachine&>(TM));
+}