diff options
Diffstat (limited to 'lib/Target/X86/AsmPrinter/X86MCInstLower.cpp')
| -rw-r--r-- | lib/Target/X86/AsmPrinter/X86MCInstLower.cpp | 485 |
1 files changed, 485 insertions, 0 deletions
diff --git a/lib/Target/X86/AsmPrinter/X86MCInstLower.cpp b/lib/Target/X86/AsmPrinter/X86MCInstLower.cpp new file mode 100644 index 0000000..5ccddf5 --- /dev/null +++ b/lib/Target/X86/AsmPrinter/X86MCInstLower.cpp @@ -0,0 +1,485 @@ +//===-- 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/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 { + SmallString<60> Name; + raw_svector_ostream(Name) << AsmPrinter.MAI->getPrivateGlobalPrefix() + << AsmPrinter.getFunctionNumber() << "$pb"; + return Ctx.GetOrCreateSymbol(Name.str()); +} + + +/// LowerGlobalAddressOperand - Lower an MO_GlobalAddress operand to an +/// MCOperand. +MCSymbol *X86MCInstLower:: +GetGlobalAddressSymbol(const MachineOperand &MO) const { + const GlobalValue *GV = MO.getGlobal(); + + bool isImplicitlyPrivate = false; + if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB || + MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY || + MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE || + MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE) + isImplicitlyPrivate = true; + + SmallString<128> Name; + Mang->getNameWithPrefix(Name, GV, isImplicitlyPrivate); + + if (getSubtarget().isTargetCygMing()) { + X86COFFMachineModuleInfo &COFFMMI = + AsmPrinter.MMI->getObjFileInfo<X86COFFMachineModuleInfo>(); + COFFMMI.DecorateCygMingName(Name, GV, *AsmPrinter.TM.getTargetData()); + } + + switch (MO.getTargetFlags()) { + default: llvm_unreachable("Unknown target flag on GV operand"); + case X86II::MO_NO_FLAG: // No flag. + case X86II::MO_PIC_BASE_OFFSET: // Doesn't modify symbol name. + break; + case X86II::MO_DLLIMPORT: { + // Handle dllimport linkage. + const char *Prefix = "__imp_"; + Name.insert(Name.begin(), Prefix, Prefix+strlen(Prefix)); + break; + } + case X86II::MO_DARWIN_NONLAZY: + case X86II::MO_DARWIN_NONLAZY_PIC_BASE: { + Name += "$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: + 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; + } + + 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: + O << '\t'; + printInlineAsm(MI); + return; + case TargetInstrInfo::IMPLICIT_DEF: + printImplicitDef(MI); + return; + case TargetInstrInfo::KILL: + 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. + SmallString<64> Name; + raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() + << "picbaseref" << getFunctionNumber(); + MCSymbol *DotSym = OutContext.GetOrCreateSymbol(Name.str()); + 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); +} + |
