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llvm-project/llvm/lib/Target/X86/AsmPrinter/X86MCInstLower.cpp

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//===-- X86MCInstLower.cpp - Convert X86 MachineInstr to an MCInst --------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains code to lower X86 MachineInstrs to their corresponding
// MCInst records.
//
//===----------------------------------------------------------------------===//
#include "X86MCInstLower.h"
#include "X86AsmPrinter.h"
#include "X86MCAsmInfo.h"
#include "X86COFFMachineModuleInfo.h"
#include "llvm/CodeGen/MachineModuleInfoImpls.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/FormattedStream.h"
#include "llvm/Support/Mangler.h"
#include "llvm/ADT/SmallString.h"
using namespace llvm;
const X86Subtarget &X86MCInstLower::getSubtarget() const {
return AsmPrinter.getSubtarget();
}
MachineModuleInfoMachO &X86MCInstLower::getMachOMMI() const {
assert(getSubtarget().isTargetDarwin() &&"Can only get MachO info on darwin");
return AsmPrinter.MMI->getObjFileInfo<MachineModuleInfoMachO>();
}
MCSymbol *X86MCInstLower::GetPICBaseSymbol() const {
return Ctx.GetOrCreateSymbol(Twine(AsmPrinter.MAI->getPrivateGlobalPrefix())+
Twine(AsmPrinter.getFunctionNumber())+"$pb");
}
/// LowerGlobalAddressOperand - Lower an MO_GlobalAddress operand to an
/// MCOperand.
MCSymbol *X86MCInstLower::
GetGlobalAddressSymbol(const MachineOperand &MO) const {
const GlobalValue *GV = MO.getGlobal();
bool isImplicitlyPrivate = false;
if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB ||
MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE ||
MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE)
isImplicitlyPrivate = true;
SmallString<128> Name;
Mang->getNameWithPrefix(Name, GV, isImplicitlyPrivate);
if (getSubtarget().isTargetCygMing()) {
X86COFFMachineModuleInfo &COFFMMI =
AsmPrinter.MMI->getObjFileInfo<X86COFFMachineModuleInfo>();
COFFMMI.DecorateCygMingName(Name, GV, *AsmPrinter.TM.getTargetData());
}
switch (MO.getTargetFlags()) {
default: llvm_unreachable("Unknown target flag on GV operand");
case X86II::MO_NO_FLAG: // No flag.
case X86II::MO_PIC_BASE_OFFSET: // Doesn't modify symbol name.
break;
case X86II::MO_DLLIMPORT: {
// Handle dllimport linkage.
const char *Prefix = "__imp_";
Name.insert(Name.begin(), Prefix, Prefix+strlen(Prefix));
break;
}
case X86II::MO_DARWIN_NONLAZY:
case X86II::MO_DARWIN_NONLAZY_PIC_BASE: {
Name += "$non_lazy_ptr";
MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str());
const MCSymbol *&StubSym = getMachOMMI().getGVStubEntry(Sym);
if (StubSym == 0) {
Name.clear();
Mang->getNameWithPrefix(Name, GV, false);
StubSym = Ctx.GetOrCreateSymbol(Name.str());
}
return Sym;
}
case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE: {
Name += "$non_lazy_ptr";
MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str());
const MCSymbol *&StubSym = getMachOMMI().getHiddenGVStubEntry(Sym);
if (StubSym == 0) {
Name.clear();
Mang->getNameWithPrefix(Name, GV, false);
StubSym = Ctx.GetOrCreateSymbol(Name.str());
}
return Sym;
}
case X86II::MO_DARWIN_STUB: {
Name += "$stub";
MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str());
const MCSymbol *&StubSym = getMachOMMI().getFnStubEntry(Sym);
if (StubSym == 0) {
Name.clear();
Mang->getNameWithPrefix(Name, GV, false);
StubSym = Ctx.GetOrCreateSymbol(Name.str());
}
return Sym;
}
// FIXME: These probably should be a modifier on the symbol or something??
case X86II::MO_TLSGD: Name += "@TLSGD"; break;
case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
case X86II::MO_TPOFF: Name += "@TPOFF"; break;
case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
case X86II::MO_GOT: Name += "@GOT"; break;
case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
case X86II::MO_PLT: Name += "@PLT"; break;
}
return Ctx.GetOrCreateSymbol(Name.str());
}
MCSymbol *X86MCInstLower::
GetExternalSymbolSymbol(const MachineOperand &MO) const {
SmallString<128> Name;
Name += AsmPrinter.MAI->getGlobalPrefix();
Name += MO.getSymbolName();
switch (MO.getTargetFlags()) {
default: llvm_unreachable("Unknown target flag on GV operand");
case X86II::MO_NO_FLAG: // No flag.
case X86II::MO_GOT_ABSOLUTE_ADDRESS: // Doesn't modify symbol name.
case X86II::MO_PIC_BASE_OFFSET: // Doesn't modify symbol name.
break;
case X86II::MO_DLLIMPORT: {
// Handle dllimport linkage.
const char *Prefix = "__imp_";
Name.insert(Name.begin(), Prefix, Prefix+strlen(Prefix));
break;
}
case X86II::MO_DARWIN_STUB: {
Name += "$stub";
MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str());
const MCSymbol *&StubSym = getMachOMMI().getFnStubEntry(Sym);
if (StubSym == 0) {
Name.erase(Name.end()-5, Name.end());
StubSym = Ctx.GetOrCreateSymbol(Name.str());
}
return Sym;
}
// FIXME: These probably should be a modifier on the symbol or something??
case X86II::MO_TLSGD: Name += "@TLSGD"; break;
case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
case X86II::MO_TPOFF: Name += "@TPOFF"; break;
case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
case X86II::MO_GOT: Name += "@GOT"; break;
case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
case X86II::MO_PLT: Name += "@PLT"; break;
}
return Ctx.GetOrCreateSymbol(Name.str());
}
MCSymbol *X86MCInstLower::GetJumpTableSymbol(const MachineOperand &MO) const {
SmallString<256> Name;
raw_svector_ostream(Name) << AsmPrinter.MAI->getPrivateGlobalPrefix() << "JTI"
<< AsmPrinter.getFunctionNumber() << '_' << MO.getIndex();
switch (MO.getTargetFlags()) {
default:
llvm_unreachable("Unknown target flag on GV operand");
case X86II::MO_NO_FLAG: // No flag.
case X86II::MO_PIC_BASE_OFFSET:
case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
break;
// FIXME: These probably should be a modifier on the symbol or something??
case X86II::MO_TLSGD: Name += "@TLSGD"; break;
case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
case X86II::MO_TPOFF: Name += "@TPOFF"; break;
case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
case X86II::MO_GOT: Name += "@GOT"; break;
case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
case X86II::MO_PLT: Name += "@PLT"; break;
}
// Create a symbol for the name.
return Ctx.GetOrCreateSymbol(Name.str());
}
MCSymbol *X86MCInstLower::
GetConstantPoolIndexSymbol(const MachineOperand &MO) const {
SmallString<256> Name;
raw_svector_ostream(Name) << AsmPrinter.MAI->getPrivateGlobalPrefix() << "CPI"
<< AsmPrinter.getFunctionNumber() << '_' << MO.getIndex();
switch (MO.getTargetFlags()) {
default:
llvm_unreachable("Unknown target flag on GV operand");
case X86II::MO_NO_FLAG: // No flag.
case X86II::MO_PIC_BASE_OFFSET:
case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
break;
// FIXME: These probably should be a modifier on the symbol or something??
case X86II::MO_TLSGD: Name += "@TLSGD"; break;
case X86II::MO_GOTTPOFF: Name += "@GOTTPOFF"; break;
case X86II::MO_INDNTPOFF: Name += "@INDNTPOFF"; break;
case X86II::MO_TPOFF: Name += "@TPOFF"; break;
case X86II::MO_NTPOFF: Name += "@NTPOFF"; break;
case X86II::MO_GOTPCREL: Name += "@GOTPCREL"; break;
case X86II::MO_GOT: Name += "@GOT"; break;
case X86II::MO_GOTOFF: Name += "@GOTOFF"; break;
case X86II::MO_PLT: Name += "@PLT"; break;
}
// Create a symbol for the name.
return Ctx.GetOrCreateSymbol(Name.str());
}
MCOperand X86MCInstLower::LowerSymbolOperand(const MachineOperand &MO,
MCSymbol *Sym) const {
// FIXME: We would like an efficient form for this, so we don't have to do a
// lot of extra uniquing.
const MCExpr *Expr = MCSymbolRefExpr::Create(Sym, Ctx);
switch (MO.getTargetFlags()) {
default: llvm_unreachable("Unknown target flag on GV operand");
case X86II::MO_NO_FLAG: // No flag.
// These affect the name of the symbol, not any suffix.
case X86II::MO_DARWIN_NONLAZY:
case X86II::MO_DLLIMPORT:
case X86II::MO_DARWIN_STUB:
case X86II::MO_TLSGD:
case X86II::MO_GOTTPOFF:
case X86II::MO_INDNTPOFF:
case X86II::MO_TPOFF:
case X86II::MO_NTPOFF:
case X86II::MO_GOTPCREL:
case X86II::MO_GOT:
case X86II::MO_GOTOFF:
case X86II::MO_PLT:
break;
case X86II::MO_PIC_BASE_OFFSET:
case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
// Subtract the pic base.
Expr = MCBinaryExpr::CreateSub(Expr,
MCSymbolRefExpr::Create(GetPICBaseSymbol(), Ctx),
Ctx);
break;
}
if (!MO.isJTI() && MO.getOffset())
Expr = MCBinaryExpr::CreateAdd(Expr,
MCConstantExpr::Create(MO.getOffset(), Ctx),
Ctx);
return MCOperand::CreateExpr(Expr);
}
static void lower_subreg32(MCInst *MI, unsigned OpNo) {
// Convert registers in the addr mode according to subreg32.
unsigned Reg = MI->getOperand(OpNo).getReg();
if (Reg != 0)
MI->getOperand(OpNo).setReg(getX86SubSuperRegister(Reg, MVT::i32));
}
static void lower_lea64_32mem(MCInst *MI, unsigned OpNo) {
// Convert registers in the addr mode according to subreg64.
for (unsigned i = 0; i != 4; ++i) {
if (!MI->getOperand(OpNo+i).isReg()) continue;
unsigned Reg = MI->getOperand(OpNo+i).getReg();
if (Reg == 0) continue;
MI->getOperand(OpNo+i).setReg(getX86SubSuperRegister(Reg, MVT::i64));
}
}
void X86MCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const {
OutMI.setOpcode(MI->getOpcode());
for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
const MachineOperand &MO = MI->getOperand(i);
MCOperand MCOp;
switch (MO.getType()) {
default:
MI->dump();
llvm_unreachable("unknown operand type");
case MachineOperand::MO_Register:
// Ignore all implicit register operands.
if (MO.isImplicit()) continue;
MCOp = MCOperand::CreateReg(MO.getReg());
break;
case MachineOperand::MO_Immediate:
MCOp = MCOperand::CreateImm(MO.getImm());
break;
case MachineOperand::MO_MachineBasicBlock:
MCOp = MCOperand::CreateExpr(MCSymbolRefExpr::Create(
AsmPrinter.GetMBBSymbol(MO.getMBB()->getNumber()), Ctx));
break;
case MachineOperand::MO_GlobalAddress:
MCOp = LowerSymbolOperand(MO, GetGlobalAddressSymbol(MO));
break;
case MachineOperand::MO_ExternalSymbol:
MCOp = LowerSymbolOperand(MO, GetExternalSymbolSymbol(MO));
break;
case MachineOperand::MO_JumpTableIndex:
MCOp = LowerSymbolOperand(MO, GetJumpTableSymbol(MO));
break;
case MachineOperand::MO_ConstantPoolIndex:
MCOp = LowerSymbolOperand(MO, GetConstantPoolIndexSymbol(MO));
break;
case MachineOperand::MO_BlockAddress:
MCOp = LowerSymbolOperand(MO, AsmPrinter.GetBlockAddressSymbol(
MO.getBlockAddress()));
break;
}
OutMI.addOperand(MCOp);
}
// Handle a few special cases to eliminate operand modifiers.
switch (OutMI.getOpcode()) {
case X86::LEA64_32r: // Handle 'subreg rewriting' for the lea64_32mem operand.
lower_lea64_32mem(&OutMI, 1);
break;
case X86::MOV16r0:
OutMI.setOpcode(X86::MOV32r0);
lower_subreg32(&OutMI, 0);
break;
case X86::MOVZX16rr8:
OutMI.setOpcode(X86::MOVZX32rr8);
lower_subreg32(&OutMI, 0);
break;
case X86::MOVZX16rm8:
OutMI.setOpcode(X86::MOVZX32rm8);
lower_subreg32(&OutMI, 0);
break;
case X86::MOVSX16rr8:
OutMI.setOpcode(X86::MOVSX32rr8);
lower_subreg32(&OutMI, 0);
break;
case X86::MOVSX16rm8:
OutMI.setOpcode(X86::MOVSX32rm8);
lower_subreg32(&OutMI, 0);
break;
case X86::MOVZX64rr32:
OutMI.setOpcode(X86::MOV32rr);
lower_subreg32(&OutMI, 0);
break;
case X86::MOVZX64rm32:
OutMI.setOpcode(X86::MOV32rm);
lower_subreg32(&OutMI, 0);
break;
case X86::MOV64ri64i32:
OutMI.setOpcode(X86::MOV32ri);
lower_subreg32(&OutMI, 0);
break;
case X86::MOVZX64rr8:
OutMI.setOpcode(X86::MOVZX32rr8);
lower_subreg32(&OutMI, 0);
break;
case X86::MOVZX64rm8:
OutMI.setOpcode(X86::MOVZX32rm8);
lower_subreg32(&OutMI, 0);
break;
case X86::MOVZX64rr16:
OutMI.setOpcode(X86::MOVZX32rr16);
lower_subreg32(&OutMI, 0);
break;
case X86::MOVZX64rm16:
OutMI.setOpcode(X86::MOVZX32rm16);
lower_subreg32(&OutMI, 0);
break;
}
}
void X86AsmPrinter::printInstructionThroughMCStreamer(const MachineInstr *MI) {
X86MCInstLower MCInstLowering(OutContext, Mang, *this);
switch (MI->getOpcode()) {
case TargetInstrInfo::DBG_LABEL:
case TargetInstrInfo::EH_LABEL:
case TargetInstrInfo::GC_LABEL:
printLabel(MI);
return;
case TargetInstrInfo::INLINEASM:
printInlineAsm(MI);
return;
case TargetInstrInfo::IMPLICIT_DEF:
printImplicitDef(MI);
return;
case TargetInstrInfo::KILL:
printKill(MI);
return;
case X86::MOVPC32r: {
MCInst TmpInst;
// This is a pseudo op for a two instruction sequence with a label, which
// looks like:
// call "L1$pb"
// "L1$pb":
// popl %esi
// Emit the call.
MCSymbol *PICBase = MCInstLowering.GetPICBaseSymbol();
TmpInst.setOpcode(X86::CALLpcrel32);
// FIXME: We would like an efficient form for this, so we don't have to do a
// lot of extra uniquing.
TmpInst.addOperand(MCOperand::CreateExpr(MCSymbolRefExpr::Create(PICBase,
OutContext)));
printMCInst(&TmpInst);
O << '\n';
// Emit the label.
OutStreamer.EmitLabel(PICBase);
// popl $reg
TmpInst.setOpcode(X86::POP32r);
TmpInst.getOperand(0) = MCOperand::CreateReg(MI->getOperand(0).getReg());
printMCInst(&TmpInst);
return;
}
case X86::ADD32ri: {
// Lower the MO_GOT_ABSOLUTE_ADDRESS form of ADD32ri.
if (MI->getOperand(2).getTargetFlags() != X86II::MO_GOT_ABSOLUTE_ADDRESS)
break;
// Okay, we have something like:
// EAX = ADD32ri EAX, MO_GOT_ABSOLUTE_ADDRESS(@MYGLOBAL)
// For this, we want to print something like:
// MYGLOBAL + (. - PICBASE)
// However, we can't generate a ".", so just emit a new label here and refer
// to it. We know that this operand flag occurs at most once per function.
const char *Prefix = MAI->getPrivateGlobalPrefix();
MCSymbol *DotSym = OutContext.GetOrCreateSymbol(Twine(Prefix)+"picbaseref"+
Twine(getFunctionNumber()));
OutStreamer.EmitLabel(DotSym);
// Now that we have emitted the label, lower the complex operand expression.
MCSymbol *OpSym = MCInstLowering.GetExternalSymbolSymbol(MI->getOperand(2));
const MCExpr *DotExpr = MCSymbolRefExpr::Create(DotSym, OutContext);
const MCExpr *PICBase =
MCSymbolRefExpr::Create(MCInstLowering.GetPICBaseSymbol(), OutContext);
DotExpr = MCBinaryExpr::CreateSub(DotExpr, PICBase, OutContext);
DotExpr = MCBinaryExpr::CreateAdd(MCSymbolRefExpr::Create(OpSym,OutContext),
DotExpr, OutContext);
MCInst TmpInst;
TmpInst.setOpcode(X86::ADD32ri);
TmpInst.addOperand(MCOperand::CreateReg(MI->getOperand(0).getReg()));
TmpInst.addOperand(MCOperand::CreateReg(MI->getOperand(1).getReg()));
TmpInst.addOperand(MCOperand::CreateExpr(DotExpr));
printMCInst(&TmpInst);
return;
}
}
MCInst TmpInst;
MCInstLowering.Lower(MI, TmpInst);
printMCInst(&TmpInst);
}
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