#include "X86.h"
#include "llvm/PassManager.h"
#include "llvm/CodeGen/MachineCodeEmitter.h"
-#include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/Value.h"
namespace {
- class Emitter : public FunctionPass {
- X86TargetMachine &TM;
- const X86InstrInfo ⅈ
+ class Emitter : public MachineFunctionPass {
+ const X86InstrInfo *II;
MachineCodeEmitter &MCE;
public:
- Emitter(X86TargetMachine &tm, MachineCodeEmitter &mce)
- : TM(tm), II(TM.getInstrInfo()), MCE(mce) {}
+ Emitter(MachineCodeEmitter &mce) : II(0), MCE(mce) {}
- bool runOnFunction(Function &F);
+ bool runOnMachineFunction(MachineFunction &MF);
+
+ virtual const char *getPassName() const {
+ return "X86 Machine Code Emitter";
+ }
private:
void emitBasicBlock(MachineBasicBlock &MBB);
///
bool X86TargetMachine::addPassesToEmitMachineCode(PassManager &PM,
MachineCodeEmitter &MCE) {
- PM.add(new Emitter(*this, MCE));
+ PM.add(new Emitter(MCE));
return false;
}
-bool Emitter::runOnFunction(Function &F) {
- MachineFunction &MF = MachineFunction::get(&F);
+bool Emitter::runOnMachineFunction(MachineFunction &MF) {
+ II = &((X86TargetMachine&)MF.getTarget()).getInstrInfo();
MCE.startFunction(MF);
+ MCE.emitConstantPool(MF.getConstantPool());
for (MachineFunction::iterator I = MF.begin(), E = MF.end(); I != E; ++I)
emitBasicBlock(*I);
MCE.finishFunction(MF);
case X86::EBP: case X86::BP: case X86::CH: return N86::EBP;
case X86::ESI: case X86::SI: case X86::DH: return N86::ESI;
case X86::EDI: case X86::DI: case X86::BH: return N86::EDI;
+
+ case X86::ST0: case X86::ST1: case X86::ST2: case X86::ST3:
+ case X86::ST4: case X86::ST5: case X86::ST6: case X86::ST7:
+ return RegNo-X86::ST0;
default:
assert(RegNo >= MRegisterInfo::FirstVirtualRegister &&
"Unknown physical register!");
void Emitter::emitMemModRMByte(const MachineInstr &MI,
unsigned Op, unsigned RegOpcodeField) {
+ const MachineOperand &Disp = MI.getOperand(Op+3);
+ if (MI.getOperand(Op).isConstantPoolIndex()) {
+ // Emit a direct address reference [disp32] where the displacement is
+ // controlled by the MCE.
+ MCE.emitByte(ModRMByte(0, RegOpcodeField, 5));
+ unsigned Index = MI.getOperand(Op).getConstantPoolIndex();
+ MCE.emitFunctionConstantValueAddress(Index, Disp.getImmedValue());
+ return;
+ }
+
const MachineOperand &BaseReg = MI.getOperand(Op);
const MachineOperand &Scale = MI.getOperand(Op+1);
const MachineOperand &IndexReg = MI.getOperand(Op+2);
- const MachineOperand &Disp = MI.getOperand(Op+3);
// Is a SIB byte needed?
if (IndexReg.getReg() == 0 && BaseReg.getReg() != X86::ESP) {
emitConstant(Disp.getImmedValue(), 1);
} else {
// Emit the most general non-SIB encoding: [REG+disp32]
- MCE.emitByte(ModRMByte(1, RegOpcodeField, BaseRegNo));
+ MCE.emitByte(ModRMByte(2, RegOpcodeField, BaseRegNo));
emitConstant(Disp.getImmedValue(), 4);
}
}
assert(IndexReg.getReg() != X86::ESP && "Cannot use ESP as index reg!");
bool ForceDisp32 = false;
+ bool ForceDisp8 = false;
if (BaseReg.getReg() == 0) {
// If there is no base register, we emit the special case SIB byte with
// MOD=0, BASE=5, to JUST get the index, scale, and displacement.
MCE.emitByte(ModRMByte(0, RegOpcodeField, 4));
ForceDisp32 = true;
- } else if (Disp.getImmedValue() == 0) {
+ } else if (Disp.getImmedValue() == 0 && BaseReg.getReg() != X86::EBP) {
// Emit no displacement ModR/M byte
MCE.emitByte(ModRMByte(0, RegOpcodeField, 4));
} else if (isDisp8(Disp.getImmedValue())) {
// Emit the disp8 encoding...
MCE.emitByte(ModRMByte(1, RegOpcodeField, 4));
+ ForceDisp8 = true; // Make sure to force 8 bit disp if Base=EBP
} else {
// Emit the normal disp32 encoding...
MCE.emitByte(ModRMByte(2, RegOpcodeField, 4));
emitSIBByte(SS, getX86RegNum(IndexReg.getReg()), 5);
} else {
unsigned BaseRegNo = getX86RegNum(BaseReg.getReg());
- unsigned IndexRegNo = getX86RegNum(IndexReg.getReg());
+ unsigned IndexRegNo;
+ if (IndexReg.getReg())
+ IndexRegNo = getX86RegNum(IndexReg.getReg());
+ else
+ IndexRegNo = 4; // For example [ESP+1*<noreg>+4]
emitSIBByte(SS, IndexRegNo, BaseRegNo);
}
// Do we need to output a displacement?
- if (Disp.getImmedValue() != 0 || ForceDisp32) {
+ if (Disp.getImmedValue() != 0 || ForceDisp32 || ForceDisp8) {
if (!ForceDisp32 && isDisp8(Disp.getImmedValue()))
emitConstant(Disp.getImmedValue(), 1);
else
}
}
-static bool isImmediate(const MachineOperand &MO) {
- return MO.getType() == MachineOperand::MO_SignExtendedImmed ||
- MO.getType() == MachineOperand::MO_UnextendedImmed;
-}
-
-unsigned sizeOfPtr (const MachineInstrDescriptor &Desc) {
+unsigned sizeOfPtr(const TargetInstrDescriptor &Desc) {
switch (Desc.TSFlags & X86II::ArgMask) {
case X86II::Arg8: return 1;
case X86II::Arg16: return 2;
case X86II::Arg32: return 4;
- case X86II::Arg64: return 8;
- case X86II::Arg80: return 10;
- case X86II::Arg128: return 16;
+ case X86II::ArgF32: return 4;
+ case X86II::ArgF64: return 8;
+ case X86II::ArgF80: return 10;
default: assert(0 && "Memory size not set!");
+ return 0;
}
}
void Emitter::emitInstruction(MachineInstr &MI) {
unsigned Opcode = MI.getOpcode();
- const MachineInstrDescriptor &Desc = II.get(Opcode);
+ const TargetInstrDescriptor &Desc = II->get(Opcode);
// Emit instruction prefixes if neccesary
if (Desc.TSFlags & X86II::OpSize) MCE.emitByte(0x66);// Operand size...
- if (Desc.TSFlags & X86II::TB) MCE.emitByte(0x0F);// Two-byte opcode prefix
- unsigned char BaseOpcode = II.getBaseOpcodeFor(Opcode);
+ switch (Desc.TSFlags & X86II::Op0Mask) {
+ case X86II::TB:
+ MCE.emitByte(0x0F); // Two-byte opcode prefix
+ break;
+ case X86II::D8: case X86II::D9: case X86II::DA: case X86II::DB:
+ case X86II::DC: case X86II::DD: case X86II::DE: case X86II::DF:
+ MCE.emitByte(0xD8+
+ (((Desc.TSFlags & X86II::Op0Mask)-X86II::D8)
+ >> X86II::Op0Shift));
+ break; // Two-byte opcode prefix
+ default: assert(0 && "Invalid prefix!");
+ case 0: break; // No prefix!
+ }
+
+ unsigned char BaseOpcode = II->getBaseOpcodeFor(Opcode);
switch (Desc.TSFlags & X86II::FormMask) {
+ default: assert(0 && "Unknown FormMask value in X86 MachineCodeEmitter!");
+ case X86II::Pseudo:
+ std::cerr << "X86 Machine Code Emitter: No 'form', not emitting: " << MI;
+ break;
+
case X86II::RawFrm:
MCE.emitByte(BaseOpcode);
-
if (MI.getNumOperands() == 1) {
- assert(MI.getOperand(0).getType() == MachineOperand::MO_PCRelativeDisp);
- MCE.emitPCRelativeDisp(MI.getOperand(0).getVRegValue());
+ MachineOperand &MO = MI.getOperand(0);
+ if (MO.isPCRelativeDisp()) {
+ MCE.emitPCRelativeDisp(MO.getVRegValue());
+ } else if (MO.isGlobalAddress()) {
+ MCE.emitGlobalAddress(MO.getGlobal(), MO.isPCRelative());
+ } else if (MO.isExternalSymbol()) {
+ MCE.emitGlobalAddress(MO.getSymbolName(), MO.isPCRelative());
+ } else {
+ assert(0 && "Unknown RawFrm operand!");
+ }
}
break;
+
case X86II::AddRegFrm:
MCE.emitByte(BaseOpcode + getX86RegNum(MI.getOperand(0).getReg()));
if (MI.getNumOperands() == 2) {
- unsigned Size = sizeOfPtr(Desc);
- if (Value *V = MI.getOperand(1).getVRegValueOrNull()) {
- assert(Size == 4 && "Don't know how to emit non-pointer values!");
- MCE.emitGlobalAddress(cast<GlobalValue>(V));
- } else {
- emitConstant(MI.getOperand(1).getImmedValue(), Size);
+ MachineOperand &MO1 = MI.getOperand(1);
+ if (MO1.isImmediate() || MO1.getVRegValueOrNull() ||
+ MO1.isGlobalAddress() || MO1.isExternalSymbol()) {
+ unsigned Size = sizeOfPtr(Desc);
+ if (Value *V = MO1.getVRegValueOrNull()) {
+ assert(Size == 4 && "Don't know how to emit non-pointer values!");
+ MCE.emitGlobalAddress(cast<GlobalValue>(V), false);
+ } else if (MO1.isGlobalAddress()) {
+ assert(Size == 4 && "Don't know how to emit non-pointer values!");
+ MCE.emitGlobalAddress(MO1.getGlobal(), MO1.isPCRelative());
+ } else if (MO1.isExternalSymbol()) {
+ assert(Size == 4 && "Don't know how to emit non-pointer values!");
+ MCE.emitGlobalAddress(MO1.getSymbolName(), MO1.isPCRelative());
+ } else {
+ emitConstant(MO1.getImmedValue(), Size);
+ }
}
}
break;
- case X86II::MRMDestReg:
+
+ case X86II::MRMDestReg: {
MCE.emitByte(BaseOpcode);
- emitRegModRMByte(MI.getOperand(0).getReg(),
- getX86RegNum(MI.getOperand(MI.getNumOperands()-1).getReg()));
+ MachineOperand &SrcOp = MI.getOperand(1+II->isTwoAddrInstr(Opcode));
+ emitRegModRMByte(MI.getOperand(0).getReg(), getX86RegNum(SrcOp.getReg()));
+ if (MI.getNumOperands() == 4)
+ emitConstant(MI.getOperand(3).getImmedValue(), sizeOfPtr(Desc));
break;
+ }
case X86II::MRMDestMem:
MCE.emitByte(BaseOpcode);
emitMemModRMByte(MI, 0, getX86RegNum(MI.getOperand(4).getReg()));
break;
+
case X86II::MRMSrcReg:
MCE.emitByte(BaseOpcode);
emitRegModRMByte(MI.getOperand(MI.getNumOperands()-1).getReg(),
getX86RegNum(MI.getOperand(0).getReg()));
break;
+
case X86II::MRMSrcMem:
MCE.emitByte(BaseOpcode);
emitMemModRMByte(MI, MI.getNumOperands()-4,
emitRegModRMByte(MI.getOperand(0).getReg(),
(Desc.TSFlags & X86II::FormMask)-X86II::MRMS0r);
- if (isImmediate(MI.getOperand(MI.getNumOperands()-1))) {
+ if (MI.getOperand(MI.getNumOperands()-1).isImmediate()) {
unsigned Size = sizeOfPtr(Desc);
emitConstant(MI.getOperand(MI.getNumOperands()-1).getImmedValue(), Size);
}
break;
-
-
+
+ case X86II::MRMS0m: case X86II::MRMS1m:
+ case X86II::MRMS2m: case X86II::MRMS3m:
+ case X86II::MRMS4m: case X86II::MRMS5m:
+ case X86II::MRMS6m: case X86II::MRMS7m:
+ MCE.emitByte(BaseOpcode);
+ emitMemModRMByte(MI, 0, (Desc.TSFlags & X86II::FormMask)-X86II::MRMS0m);
+
+ if (MI.getNumOperands() == 5) {
+ unsigned Size = sizeOfPtr(Desc);
+ emitConstant(MI.getOperand(4).getImmedValue(), Size);
+ }
+ break;
}
}
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