-//===-- X86/MachineCodeEmitter.cpp - Convert X86 code to machine code -----===//
+//===-- X86/X86CodeEmitter.cpp - Convert X86 code to machine code ---------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
//
// This file contains the pass that transforms the X86 machine instructions into
-// actual executable machine code.
+// relocatable machine code.
//
//===----------------------------------------------------------------------===//
#include "X86TargetMachine.h"
+#include "X86Relocations.h"
#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"
+#include "llvm/CodeGen/Passes.h"
+#include "llvm/Function.h"
+#include "llvm/ADT/Statistic.h"
+using namespace llvm;
+
+namespace {
+ Statistic<>
+ NumEmitted("x86-emitter", "Number of machine instructions emitted");
+}
namespace {
- class Emitter : public FunctionPass {
- X86TargetMachine &TM;
- const X86InstrInfo &II;
+ class Emitter : public MachineFunctionPass {
+ const X86InstrInfo *II;
MachineCodeEmitter &MCE;
+ std::map<const MachineBasicBlock*, unsigned> BasicBlockAddrs;
+ std::vector<std::pair<const MachineBasicBlock *, unsigned> > BBRefs;
public:
+ explicit Emitter(MachineCodeEmitter &mce) : II(0), MCE(mce) {}
+ Emitter(MachineCodeEmitter &mce, const X86InstrInfo& ii)
+ : II(&ii), MCE(mce) {}
- Emitter(X86TargetMachine &tm, MachineCodeEmitter &mce)
- : TM(tm), II(TM.getInstrInfo()), MCE(mce) {}
+ bool runOnMachineFunction(MachineFunction &MF);
- bool runOnFunction(Function &F);
+ virtual const char *getPassName() const {
+ return "X86 Machine Code Emitter";
+ }
+
+ void emitInstruction(const MachineInstr &MI);
private:
- void emitBasicBlock(MachineBasicBlock &MBB);
- void emitInstruction(MachineInstr &MI);
+ void emitBasicBlock(const MachineBasicBlock &MBB);
+
+ void emitPCRelativeBlockAddress(const MachineBasicBlock *BB);
+ void emitPCRelativeValue(unsigned Address);
+ void emitGlobalAddressForCall(GlobalValue *GV);
+ void emitGlobalAddressForPtr(GlobalValue *GV, int Disp = 0);
+ void emitExternalSymbolAddress(const char *ES, bool isPCRelative);
void emitRegModRMByte(unsigned ModRMReg, unsigned RegOpcodeField);
void emitSIBByte(unsigned SS, unsigned Index, unsigned Base);
};
}
-
/// addPassesToEmitMachineCode - Add passes to the specified pass manager to get
-/// machine code emitted. This uses a MAchineCodeEmitter object to handle
+/// machine code emitted. This uses a MachineCodeEmitter object to handle
/// actually outputting the machine code and resolving things like the address
/// of functions. This method should returns true if machine code emission is
/// not supported.
///
-bool X86TargetMachine::addPassesToEmitMachineCode(PassManager &PM,
+bool X86TargetMachine::addPassesToEmitMachineCode(FunctionPassManager &PM,
MachineCodeEmitter &MCE) {
- PM.add(new Emitter(*this, MCE));
+ PM.add(new Emitter(MCE));
+ // Delete machine code for this function
+ PM.add(createMachineCodeDeleter());
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);
+
+ // Resolve all forward branches now...
+ for (unsigned i = 0, e = BBRefs.size(); i != e; ++i) {
+ unsigned Location = BasicBlockAddrs[BBRefs[i].first];
+ unsigned Ref = BBRefs[i].second;
+ MCE.emitWordAt(Location-Ref-4, (unsigned*)(intptr_t)Ref);
+ }
+ BBRefs.clear();
+ BasicBlockAddrs.clear();
return false;
}
-void Emitter::emitBasicBlock(MachineBasicBlock &MBB) {
- MCE.startBasicBlock(MBB);
- for (MachineBasicBlock::iterator I = MBB.begin(), E = MBB.end(); I != E; ++I)
- emitInstruction(**I);
+void Emitter::emitBasicBlock(const MachineBasicBlock &MBB) {
+ if (uint64_t Addr = MCE.getCurrentPCValue())
+ BasicBlockAddrs[&MBB] = Addr;
+
+ for (MachineBasicBlock::const_iterator I = MBB.begin(), E = MBB.end();
+ I != E; ++I)
+ emitInstruction(*I);
}
+/// emitPCRelativeValue - Emit a 32-bit PC relative address.
+///
+void Emitter::emitPCRelativeValue(unsigned Address) {
+ MCE.emitWord(Address-MCE.getCurrentPCValue()-4);
+}
-namespace N86 { // Native X86 Register numbers...
+/// emitPCRelativeBlockAddress - This method emits the PC relative address of
+/// the specified basic block, or if the basic block hasn't been emitted yet
+/// (because this is a forward branch), it keeps track of the information
+/// necessary to resolve this address later (and emits a dummy value).
+///
+void Emitter::emitPCRelativeBlockAddress(const MachineBasicBlock *MBB) {
+ // If this is a backwards branch, we already know the address of the target,
+ // so just emit the value.
+ std::map<const MachineBasicBlock*, unsigned>::iterator I =
+ BasicBlockAddrs.find(MBB);
+ if (I != BasicBlockAddrs.end()) {
+ emitPCRelativeValue(I->second);
+ } else {
+ // Otherwise, remember where this reference was and where it is to so we can
+ // deal with it later.
+ BBRefs.push_back(std::make_pair(MBB, MCE.getCurrentPCValue()));
+ MCE.emitWord(0);
+ }
+}
+
+/// emitGlobalAddressForCall - Emit the specified address to the code stream
+/// assuming this is part of a function call, which is PC relative.
+///
+void Emitter::emitGlobalAddressForCall(GlobalValue *GV) {
+ MCE.addRelocation(MachineRelocation(MCE.getCurrentPCOffset(),
+ X86::reloc_pcrel_word, GV, 0, true));
+ MCE.emitWord(0);
+}
+
+/// emitGlobalAddress - Emit the specified address to the code stream assuming
+/// this is part of a "take the address of a global" instruction, which is not
+/// PC relative.
+///
+void Emitter::emitGlobalAddressForPtr(GlobalValue *GV, int Disp /* = 0 */) {
+ MCE.addRelocation(MachineRelocation(MCE.getCurrentPCOffset(),
+ X86::reloc_absolute_word, GV));
+ MCE.emitWord(Disp); // The relocated value will be added to the displacement
+}
+
+/// emitExternalSymbolAddress - Arrange for the address of an external symbol to
+/// be emitted to the current location in the function, and allow it to be PC
+/// relative.
+void Emitter::emitExternalSymbolAddress(const char *ES, bool isPCRelative) {
+ MCE.addRelocation(MachineRelocation(MCE.getCurrentPCOffset(),
+ isPCRelative ? X86::reloc_pcrel_word : X86::reloc_absolute_word, ES));
+ MCE.emitWord(0);
+}
+
+/// N86 namespace - Native X86 Register numbers... used by X86 backend.
+///
+namespace N86 {
enum {
EAX = 0, ECX = 1, EDX = 2, EBX = 3, ESP = 4, EBP = 5, ESI = 6, EDI = 7
};
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 &&
+ assert(MRegisterInfo::isVirtualRegister(RegNo) &&
"Unknown physical register!");
assert(0 && "Register allocator hasn't allocated reg correctly yet!");
return 0;
void Emitter::emitMemModRMByte(const MachineInstr &MI,
unsigned Op, unsigned RegOpcodeField) {
- const MachineOperand &BaseReg = MI.getOperand(Op);
+ const MachineOperand &Op3 = MI.getOperand(Op+3);
+ GlobalValue *GV = 0;
+ int DispVal = 0;
+
+ if (Op3.isGlobalAddress()) {
+ GV = Op3.getGlobal();
+ DispVal = Op3.getOffset();
+ } else {
+ DispVal = Op3.getImmedValue();
+ }
+
+ const MachineOperand &Base = MI.getOperand(Op);
const MachineOperand &Scale = MI.getOperand(Op+1);
const MachineOperand &IndexReg = MI.getOperand(Op+2);
- const MachineOperand &Disp = MI.getOperand(Op+3);
+
+ unsigned BaseReg = 0;
+
+ if (Base.isConstantPoolIndex()) {
+ // Emit a direct address reference [disp32] where the displacement of the
+ // constant pool entry is controlled by the MCE.
+ assert(!GV && "Constant Pool reference cannot be relative to global!");
+ DispVal += MCE.getConstantPoolEntryAddress(Base.getConstantPoolIndex());
+ } else {
+ BaseReg = Base.getReg();
+ }
// Is a SIB byte needed?
- if (IndexReg.getReg() == 0 && BaseReg.getReg() != X86::ESP) {
- if (BaseReg.getReg() == 0) { // Just a displacement?
+ if (IndexReg.getReg() == 0 && BaseReg != X86::ESP) {
+ if (BaseReg == 0) { // Just a displacement?
// Emit special case [disp32] encoding
MCE.emitByte(ModRMByte(0, RegOpcodeField, 5));
- emitConstant(Disp.getImmedValue(), 4);
+ if (GV)
+ emitGlobalAddressForPtr(GV, DispVal);
+ else
+ emitConstant(DispVal, 4);
} else {
- unsigned BaseRegNo = getX86RegNum(BaseReg.getReg());
- if (Disp.getImmedValue() == 0 && BaseRegNo != N86::EBP) {
+ unsigned BaseRegNo = getX86RegNum(BaseReg);
+ if (GV) {
+ // Emit the most general non-SIB encoding: [REG+disp32]
+ MCE.emitByte(ModRMByte(2, RegOpcodeField, BaseRegNo));
+ emitGlobalAddressForPtr(GV, DispVal);
+ } else if (DispVal == 0 && BaseRegNo != N86::EBP) {
// Emit simple indirect register encoding... [EAX] f.e.
MCE.emitByte(ModRMByte(0, RegOpcodeField, BaseRegNo));
- } else if (isDisp8(Disp.getImmedValue())) {
+ } else if (isDisp8(DispVal)) {
// Emit the disp8 encoding... [REG+disp8]
MCE.emitByte(ModRMByte(1, RegOpcodeField, BaseRegNo));
- emitConstant(Disp.getImmedValue(), 1);
+ emitConstant(DispVal, 1);
} else {
// Emit the most general non-SIB encoding: [REG+disp32]
- MCE.emitByte(ModRMByte(1, RegOpcodeField, BaseRegNo));
- emitConstant(Disp.getImmedValue(), 4);
+ MCE.emitByte(ModRMByte(2, RegOpcodeField, BaseRegNo));
+ emitConstant(DispVal, 4);
}
}
assert(IndexReg.getReg() != X86::ESP && "Cannot use ESP as index reg!");
bool ForceDisp32 = false;
- if (BaseReg.getReg() == 0) {
+ bool ForceDisp8 = false;
+ if (BaseReg == 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 (GV) {
+ // Emit the normal disp32 encoding...
+ MCE.emitByte(ModRMByte(2, RegOpcodeField, 4));
+ ForceDisp32 = true;
+ } else if (DispVal == 0 && BaseReg != X86::EBP) {
// Emit no displacement ModR/M byte
MCE.emitByte(ModRMByte(0, RegOpcodeField, 4));
- } else if (isDisp8(Disp.getImmedValue())) {
+ } else if (isDisp8(DispVal)) {
// 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));
static const unsigned SSTable[] = { ~0, 0, 1, ~0, 2, ~0, ~0, ~0, 3 };
unsigned SS = SSTable[Scale.getImmedValue()];
- if (BaseReg.getReg() == 0) {
+ if (BaseReg == 0) {
// Handle the SIB byte for the case where there is no base. The
// displacement has already been output.
assert(IndexReg.getReg() && "Index register must be specified!");
emitSIBByte(SS, getX86RegNum(IndexReg.getReg()), 5);
} else {
- unsigned BaseRegNo = getX86RegNum(BaseReg.getReg());
- unsigned IndexRegNo = getX86RegNum(IndexReg.getReg());
+ unsigned BaseRegNo = getX86RegNum(BaseReg);
+ 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 (!ForceDisp32 && isDisp8(Disp.getImmedValue()))
- emitConstant(Disp.getImmedValue(), 1);
+ if (DispVal != 0 || ForceDisp32 || ForceDisp8) {
+ if (!ForceDisp32 && isDisp8(DispVal))
+ emitConstant(DispVal, 1);
+ else if (GV)
+ emitGlobalAddressForPtr(GV, DispVal);
else
- emitConstant(Disp.getImmedValue(), 4);
+ emitConstant(DispVal, 4);
}
}
}
-static bool isImmediate(const MachineOperand &MO) {
- return MO.getType() == MachineOperand::MO_SignExtendedImmed ||
- MO.getType() == MachineOperand::MO_UnextendedImmed;
-}
-
-unsigned sizeOfPtr (const MachineInstrDescriptor &Desc) {
- switch (Desc.TSFlags & X86II::MemArgMask) {
- case X86II::MemArg8: return 1;
- case X86II::MemArg16: return 2;
- case X86II::MemArg32: return 4;
- case X86II::MemArg64: return 8;
- case X86II::MemArg80: return 10;
- case X86II::MemArg128: return 16;
- default: {
- // FIXME: This should be an assert, but it is returning 4 because that was
- // the former behavior and it's what was expected. Once the assumptions
- // below are fixed, this can become an assert.
- return 4;
- }
+static unsigned sizeOfImm(const TargetInstrDescriptor &Desc) {
+ switch (Desc.TSFlags & X86II::ImmMask) {
+ case X86II::Imm8: return 1;
+ case X86II::Imm16: return 2;
+ case X86II::Imm32: return 4;
+ default: assert(0 && "Immediate size not set!");
+ return 0;
}
}
+void Emitter::emitInstruction(const MachineInstr &MI) {
+ NumEmitted++; // Keep track of the # of mi's emitted
-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
+ // Emit the repeat opcode prefix as needed.
+ if ((Desc.TSFlags & X86II::Op0Mask) == X86II::REP) MCE.emitByte(0xF3);
+
+ // Emit instruction prefixes if necessary
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::REP: break; // already handled.
+ 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:
+ if (Opcode != X86::IMPLICIT_USE &&
+ Opcode != X86::IMPLICIT_DEF &&
+ Opcode != X86::FP_REG_KILL)
+ 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());
+ const MachineOperand &MO = MI.getOperand(0);
+ if (MO.isMachineBasicBlock()) {
+ emitPCRelativeBlockAddress(MO.getMachineBasicBlock());
+ } else if (MO.isGlobalAddress()) {
+ assert(MO.isPCRelative() && "Call target is not PC Relative?");
+ emitGlobalAddressForCall(MO.getGlobal());
+ } else if (MO.isExternalSymbol()) {
+ emitExternalSymbolAddress(MO.getSymbolName(), true);
+ } else if (MO.isImmediate()) {
+ emitConstant(MO.getImmedValue(), sizeOfImm(Desc));
+ } 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));
+ const MachineOperand &MO1 = MI.getOperand(1);
+ if (Value *V = MO1.getVRegValueOrNull()) {
+ assert(sizeOfImm(Desc) == 4 &&
+ "Don't know how to emit non-pointer values!");
+ emitGlobalAddressForPtr(cast<GlobalValue>(V));
+ } else if (MO1.isGlobalAddress()) {
+ assert(sizeOfImm(Desc) == 4 &&
+ "Don't know how to emit non-pointer values!");
+ assert(!MO1.isPCRelative() && "Function pointer ref is PC relative?");
+ emitGlobalAddressForPtr(MO1.getGlobal(), MO1.getOffset());
+ } else if (MO1.isExternalSymbol()) {
+ assert(sizeOfImm(Desc) == 4 &&
+ "Don't know how to emit non-pointer values!");
+ emitExternalSymbolAddress(MO1.getSymbolName(), false);
} else {
- emitConstant(MI.getOperand(1).getImmedValue(), Size);
+ emitConstant(MO1.getImmedValue(), sizeOfImm(Desc));
}
}
break;
- case X86II::MRMDestReg:
+
+ case X86II::MRMDestReg: {
MCE.emitByte(BaseOpcode);
emitRegModRMByte(MI.getOperand(0).getReg(),
- getX86RegNum(MI.getOperand(MI.getNumOperands()-1).getReg()));
- break;
+ getX86RegNum(MI.getOperand(1).getReg()));
+ if (MI.getNumOperands() == 3)
+ emitConstant(MI.getOperand(2).getImmedValue(), sizeOfImm(Desc));
+ break;
+ }
case X86II::MRMDestMem:
MCE.emitByte(BaseOpcode);
emitMemModRMByte(MI, 0, getX86RegNum(MI.getOperand(4).getReg()));
+ if (MI.getNumOperands() == 6)
+ emitConstant(MI.getOperand(5).getImmedValue(), sizeOfImm(Desc));
break;
+
case X86II::MRMSrcReg:
MCE.emitByte(BaseOpcode);
- emitRegModRMByte(MI.getOperand(MI.getNumOperands()-1).getReg(),
+
+ emitRegModRMByte(MI.getOperand(1).getReg(),
getX86RegNum(MI.getOperand(0).getReg()));
+ if (MI.getNumOperands() == 3)
+ emitConstant(MI.getOperand(2).getImmedValue(), sizeOfImm(Desc));
break;
+
case X86II::MRMSrcMem:
MCE.emitByte(BaseOpcode);
- emitMemModRMByte(MI, MI.getNumOperands()-4,
- getX86RegNum(MI.getOperand(0).getReg()));
+ emitMemModRMByte(MI, 1, getX86RegNum(MI.getOperand(0).getReg()));
+ if (MI.getNumOperands() == 2+4)
+ emitConstant(MI.getOperand(5).getImmedValue(), sizeOfImm(Desc));
break;
- case X86II::MRMS0r: case X86II::MRMS1r:
- case X86II::MRMS2r: case X86II::MRMS3r:
- case X86II::MRMS4r: case X86II::MRMS5r:
- case X86II::MRMS6r: case X86II::MRMS7r:
+ case X86II::MRM0r: case X86II::MRM1r:
+ case X86II::MRM2r: case X86II::MRM3r:
+ case X86II::MRM4r: case X86II::MRM5r:
+ case X86II::MRM6r: case X86II::MRM7r:
MCE.emitByte(BaseOpcode);
emitRegModRMByte(MI.getOperand(0).getReg(),
- (Desc.TSFlags & X86II::FormMask)-X86II::MRMS0r);
+ (Desc.TSFlags & X86II::FormMask)-X86II::MRM0r);
+
+ if (MI.getOperand(MI.getNumOperands()-1).isImmediate()) {
+ emitConstant(MI.getOperand(MI.getNumOperands()-1).getImmedValue(),
+ sizeOfImm(Desc));
+ }
+ break;
- if (isImmediate(MI.getOperand(MI.getNumOperands()-1))) {
- unsigned Size = sizeOfPtr(Desc);
- emitConstant(MI.getOperand(MI.getNumOperands()-1).getImmedValue(), Size);
+ case X86II::MRM0m: case X86II::MRM1m:
+ case X86II::MRM2m: case X86II::MRM3m:
+ case X86II::MRM4m: case X86II::MRM5m:
+ case X86II::MRM6m: case X86II::MRM7m:
+ MCE.emitByte(BaseOpcode);
+ emitMemModRMByte(MI, 0, (Desc.TSFlags & X86II::FormMask)-X86II::MRM0m);
+
+ if (MI.getNumOperands() == 5) {
+ if (MI.getOperand(4).isImmediate())
+ emitConstant(MI.getOperand(4).getImmedValue(), sizeOfImm(Desc));
+ else if (MI.getOperand(4).isGlobalAddress())
+ emitGlobalAddressForPtr(MI.getOperand(4).getGlobal(),
+ MI.getOperand(4).getOffset());
+ else
+ assert(0 && "Unknown operand!");
}
break;
-
-
}
}
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