| //===-- X86AsmPrinter.cpp - Convert X86 LLVM code to AT&T assembly --------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file contains a printer that converts from our internal representation |
| // of machine-dependent LLVM code to X86 machine code. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "X86AsmPrinter.h" |
| #include "InstPrinter/X86ATTInstPrinter.h" |
| #include "MCTargetDesc/X86BaseInfo.h" |
| #include "X86InstrInfo.h" |
| #include "X86MachineFunctionInfo.h" |
| #include "llvm/ADT/SmallString.h" |
| #include "llvm/CodeGen/MachineConstantPool.h" |
| #include "llvm/CodeGen/MachineModuleInfoImpls.h" |
| #include "llvm/CodeGen/MachineValueType.h" |
| #include "llvm/CodeGen/TargetLoweringObjectFileImpl.h" |
| #include "llvm/IR/DebugInfo.h" |
| #include "llvm/IR/DerivedTypes.h" |
| #include "llvm/IR/Mangler.h" |
| #include "llvm/IR/Module.h" |
| #include "llvm/IR/Type.h" |
| #include "llvm/MC/MCAsmInfo.h" |
| #include "llvm/MC/MCContext.h" |
| #include "llvm/MC/MCExpr.h" |
| #include "llvm/MC/MCSectionCOFF.h" |
| #include "llvm/MC/MCSectionMachO.h" |
| #include "llvm/MC/MCStreamer.h" |
| #include "llvm/MC/MCSymbol.h" |
| #include "llvm/Support/COFF.h" |
| #include "llvm/Support/Debug.h" |
| #include "llvm/Support/ErrorHandling.h" |
| #include "llvm/Support/TargetRegistry.h" |
| using namespace llvm; |
| |
| //===----------------------------------------------------------------------===// |
| // Primitive Helper Functions. |
| //===----------------------------------------------------------------------===// |
| |
| /// runOnMachineFunction - Emit the function body. |
| /// |
| bool X86AsmPrinter::runOnMachineFunction(MachineFunction &MF) { |
| Subtarget = &MF.getSubtarget<X86Subtarget>(); |
| |
| SMShadowTracker.startFunction(MF); |
| |
| SetupMachineFunction(MF); |
| |
| if (Subtarget->isTargetCOFF()) { |
| bool Intrn = MF.getFunction()->hasInternalLinkage(); |
| OutStreamer.BeginCOFFSymbolDef(CurrentFnSym); |
| OutStreamer.EmitCOFFSymbolStorageClass(Intrn ? COFF::IMAGE_SYM_CLASS_STATIC |
| : COFF::IMAGE_SYM_CLASS_EXTERNAL); |
| OutStreamer.EmitCOFFSymbolType(COFF::IMAGE_SYM_DTYPE_FUNCTION |
| << COFF::SCT_COMPLEX_TYPE_SHIFT); |
| OutStreamer.EndCOFFSymbolDef(); |
| } |
| |
| // Emit the rest of the function body. |
| EmitFunctionBody(); |
| |
| // We didn't modify anything. |
| return false; |
| } |
| |
| /// printSymbolOperand - Print a raw symbol reference operand. This handles |
| /// jump tables, constant pools, global address and external symbols, all of |
| /// which print to a label with various suffixes for relocation types etc. |
| static void printSymbolOperand(X86AsmPrinter &P, const MachineOperand &MO, |
| raw_ostream &O) { |
| switch (MO.getType()) { |
| default: llvm_unreachable("unknown symbol type!"); |
| case MachineOperand::MO_ConstantPoolIndex: |
| O << *P.GetCPISymbol(MO.getIndex()); |
| P.printOffset(MO.getOffset(), O); |
| break; |
| case MachineOperand::MO_GlobalAddress: { |
| const GlobalValue *GV = MO.getGlobal(); |
| |
| MCSymbol *GVSym; |
| if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB) |
| GVSym = P.getSymbolWithGlobalValueBase(GV, "$stub"); |
| else if (MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY || |
| MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE || |
| MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE) |
| GVSym = P.getSymbolWithGlobalValueBase(GV, "$non_lazy_ptr"); |
| else |
| GVSym = P.getSymbol(GV); |
| |
| // Handle dllimport linkage. |
| if (MO.getTargetFlags() == X86II::MO_DLLIMPORT) |
| GVSym = |
| P.OutContext.GetOrCreateSymbol(Twine("__imp_") + GVSym->getName()); |
| |
| if (MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY || |
| MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE) { |
| MCSymbol *Sym = P.getSymbolWithGlobalValueBase(GV, "$non_lazy_ptr"); |
| MachineModuleInfoImpl::StubValueTy &StubSym = |
| P.MMI->getObjFileInfo<MachineModuleInfoMachO>().getGVStubEntry(Sym); |
| if (!StubSym.getPointer()) |
| StubSym = MachineModuleInfoImpl:: |
| StubValueTy(P.getSymbol(GV), !GV->hasInternalLinkage()); |
| } else if (MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE){ |
| MCSymbol *Sym = P.getSymbolWithGlobalValueBase(GV, "$non_lazy_ptr"); |
| MachineModuleInfoImpl::StubValueTy &StubSym = |
| P.MMI->getObjFileInfo<MachineModuleInfoMachO>().getHiddenGVStubEntry( |
| Sym); |
| if (!StubSym.getPointer()) |
| StubSym = MachineModuleInfoImpl:: |
| StubValueTy(P.getSymbol(GV), !GV->hasInternalLinkage()); |
| } else if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB) { |
| MCSymbol *Sym = P.getSymbolWithGlobalValueBase(GV, "$stub"); |
| MachineModuleInfoImpl::StubValueTy &StubSym = |
| P.MMI->getObjFileInfo<MachineModuleInfoMachO>().getFnStubEntry(Sym); |
| if (!StubSym.getPointer()) |
| StubSym = MachineModuleInfoImpl:: |
| StubValueTy(P.getSymbol(GV), !GV->hasInternalLinkage()); |
| } |
| |
| // If the name begins with a dollar-sign, enclose it in parens. We do this |
| // to avoid having it look like an integer immediate to the assembler. |
| if (GVSym->getName()[0] != '$') |
| O << *GVSym; |
| else |
| O << '(' << *GVSym << ')'; |
| P.printOffset(MO.getOffset(), O); |
| break; |
| } |
| } |
| |
| switch (MO.getTargetFlags()) { |
| default: |
| llvm_unreachable("Unknown target flag on GV operand"); |
| case X86II::MO_NO_FLAG: // No flag. |
| break; |
| case X86II::MO_DARWIN_NONLAZY: |
| case X86II::MO_DLLIMPORT: |
| case X86II::MO_DARWIN_STUB: |
| // These affect the name of the symbol, not any suffix. |
| break; |
| case X86II::MO_GOT_ABSOLUTE_ADDRESS: |
| O << " + [.-" << *P.MF->getPICBaseSymbol() << ']'; |
| break; |
| case X86II::MO_PIC_BASE_OFFSET: |
| case X86II::MO_DARWIN_NONLAZY_PIC_BASE: |
| case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE: |
| O << '-' << *P.MF->getPICBaseSymbol(); |
| break; |
| case X86II::MO_TLSGD: O << "@TLSGD"; break; |
| case X86II::MO_TLSLD: O << "@TLSLD"; break; |
| case X86II::MO_TLSLDM: O << "@TLSLDM"; break; |
| case X86II::MO_GOTTPOFF: O << "@GOTTPOFF"; break; |
| case X86II::MO_INDNTPOFF: O << "@INDNTPOFF"; break; |
| case X86II::MO_TPOFF: O << "@TPOFF"; break; |
| case X86II::MO_DTPOFF: O << "@DTPOFF"; break; |
| case X86II::MO_NTPOFF: O << "@NTPOFF"; break; |
| case X86II::MO_GOTNTPOFF: O << "@GOTNTPOFF"; break; |
| case X86II::MO_GOTPCREL: O << "@GOTPCREL"; break; |
| case X86II::MO_GOT: O << "@GOT"; break; |
| case X86II::MO_GOTOFF: O << "@GOTOFF"; break; |
| case X86II::MO_PLT: O << "@PLT"; break; |
| case X86II::MO_TLVP: O << "@TLVP"; break; |
| case X86II::MO_TLVP_PIC_BASE: |
| O << "@TLVP" << '-' << *P.MF->getPICBaseSymbol(); |
| break; |
| case X86II::MO_SECREL: O << "@SECREL32"; break; |
| } |
| } |
| |
| static void printOperand(X86AsmPrinter &P, const MachineInstr *MI, |
| unsigned OpNo, raw_ostream &O, |
| const char *Modifier = nullptr, unsigned AsmVariant = 0); |
| |
| /// printPCRelImm - This is used to print an immediate value that ends up |
| /// being encoded as a pc-relative value. These print slightly differently, for |
| /// example, a $ is not emitted. |
| static void printPCRelImm(X86AsmPrinter &P, const MachineInstr *MI, |
| unsigned OpNo, raw_ostream &O) { |
| const MachineOperand &MO = MI->getOperand(OpNo); |
| switch (MO.getType()) { |
| default: llvm_unreachable("Unknown pcrel immediate operand"); |
| case MachineOperand::MO_Register: |
| // pc-relativeness was handled when computing the value in the reg. |
| printOperand(P, MI, OpNo, O); |
| return; |
| case MachineOperand::MO_Immediate: |
| O << MO.getImm(); |
| return; |
| case MachineOperand::MO_GlobalAddress: |
| printSymbolOperand(P, MO, O); |
| return; |
| } |
| } |
| |
| static void printOperand(X86AsmPrinter &P, const MachineInstr *MI, |
| unsigned OpNo, raw_ostream &O, const char *Modifier, |
| unsigned AsmVariant) { |
| const MachineOperand &MO = MI->getOperand(OpNo); |
| switch (MO.getType()) { |
| default: llvm_unreachable("unknown operand type!"); |
| case MachineOperand::MO_Register: { |
| // FIXME: Enumerating AsmVariant, so we can remove magic number. |
| if (AsmVariant == 0) O << '%'; |
| unsigned Reg = MO.getReg(); |
| if (Modifier && strncmp(Modifier, "subreg", strlen("subreg")) == 0) { |
| MVT::SimpleValueType VT = (strcmp(Modifier+6,"64") == 0) ? |
| MVT::i64 : ((strcmp(Modifier+6, "32") == 0) ? MVT::i32 : |
| ((strcmp(Modifier+6,"16") == 0) ? MVT::i16 : MVT::i8)); |
| Reg = getX86SubSuperRegister(Reg, VT); |
| } |
| O << X86ATTInstPrinter::getRegisterName(Reg); |
| return; |
| } |
| |
| case MachineOperand::MO_Immediate: |
| if (AsmVariant == 0) O << '$'; |
| O << MO.getImm(); |
| return; |
| |
| case MachineOperand::MO_GlobalAddress: { |
| if (AsmVariant == 0) O << '$'; |
| printSymbolOperand(P, MO, O); |
| break; |
| } |
| } |
| } |
| |
| static void printLeaMemReference(X86AsmPrinter &P, const MachineInstr *MI, |
| unsigned Op, raw_ostream &O, |
| const char *Modifier = nullptr) { |
| const MachineOperand &BaseReg = MI->getOperand(Op+X86::AddrBaseReg); |
| const MachineOperand &IndexReg = MI->getOperand(Op+X86::AddrIndexReg); |
| const MachineOperand &DispSpec = MI->getOperand(Op+X86::AddrDisp); |
| |
| // If we really don't want to print out (rip), don't. |
| bool HasBaseReg = BaseReg.getReg() != 0; |
| if (HasBaseReg && Modifier && !strcmp(Modifier, "no-rip") && |
| BaseReg.getReg() == X86::RIP) |
| HasBaseReg = false; |
| |
| // HasParenPart - True if we will print out the () part of the mem ref. |
| bool HasParenPart = IndexReg.getReg() || HasBaseReg; |
| |
| switch (DispSpec.getType()) { |
| default: |
| llvm_unreachable("unknown operand type!"); |
| case MachineOperand::MO_Immediate: { |
| int DispVal = DispSpec.getImm(); |
| if (DispVal || !HasParenPart) |
| O << DispVal; |
| break; |
| } |
| case MachineOperand::MO_GlobalAddress: |
| case MachineOperand::MO_ConstantPoolIndex: |
| printSymbolOperand(P, DispSpec, O); |
| } |
| |
| if (Modifier && strcmp(Modifier, "H") == 0) |
| O << "+8"; |
| |
| if (HasParenPart) { |
| assert(IndexReg.getReg() != X86::ESP && |
| "X86 doesn't allow scaling by ESP"); |
| |
| O << '('; |
| if (HasBaseReg) |
| printOperand(P, MI, Op+X86::AddrBaseReg, O, Modifier); |
| |
| if (IndexReg.getReg()) { |
| O << ','; |
| printOperand(P, MI, Op+X86::AddrIndexReg, O, Modifier); |
| unsigned ScaleVal = MI->getOperand(Op+X86::AddrScaleAmt).getImm(); |
| if (ScaleVal != 1) |
| O << ',' << ScaleVal; |
| } |
| O << ')'; |
| } |
| } |
| |
| static void printMemReference(X86AsmPrinter &P, const MachineInstr *MI, |
| unsigned Op, raw_ostream &O, |
| const char *Modifier = nullptr) { |
| assert(isMem(MI, Op) && "Invalid memory reference!"); |
| const MachineOperand &Segment = MI->getOperand(Op+X86::AddrSegmentReg); |
| if (Segment.getReg()) { |
| printOperand(P, MI, Op+X86::AddrSegmentReg, O, Modifier); |
| O << ':'; |
| } |
| printLeaMemReference(P, MI, Op, O, Modifier); |
| } |
| |
| static void printIntelMemReference(X86AsmPrinter &P, const MachineInstr *MI, |
| unsigned Op, raw_ostream &O, |
| const char *Modifier = nullptr, |
| unsigned AsmVariant = 1) { |
| const MachineOperand &BaseReg = MI->getOperand(Op+X86::AddrBaseReg); |
| unsigned ScaleVal = MI->getOperand(Op+X86::AddrScaleAmt).getImm(); |
| const MachineOperand &IndexReg = MI->getOperand(Op+X86::AddrIndexReg); |
| const MachineOperand &DispSpec = MI->getOperand(Op+X86::AddrDisp); |
| const MachineOperand &SegReg = MI->getOperand(Op+X86::AddrSegmentReg); |
| |
| // If this has a segment register, print it. |
| if (SegReg.getReg()) { |
| printOperand(P, MI, Op+X86::AddrSegmentReg, O, Modifier, AsmVariant); |
| O << ':'; |
| } |
| |
| O << '['; |
| |
| bool NeedPlus = false; |
| if (BaseReg.getReg()) { |
| printOperand(P, MI, Op+X86::AddrBaseReg, O, Modifier, AsmVariant); |
| NeedPlus = true; |
| } |
| |
| if (IndexReg.getReg()) { |
| if (NeedPlus) O << " + "; |
| if (ScaleVal != 1) |
| O << ScaleVal << '*'; |
| printOperand(P, MI, Op+X86::AddrIndexReg, O, Modifier, AsmVariant); |
| NeedPlus = true; |
| } |
| |
| if (!DispSpec.isImm()) { |
| if (NeedPlus) O << " + "; |
| printOperand(P, MI, Op+X86::AddrDisp, O, Modifier, AsmVariant); |
| } else { |
| int64_t DispVal = DispSpec.getImm(); |
| if (DispVal || (!IndexReg.getReg() && !BaseReg.getReg())) { |
| if (NeedPlus) { |
| if (DispVal > 0) |
| O << " + "; |
| else { |
| O << " - "; |
| DispVal = -DispVal; |
| } |
| } |
| O << DispVal; |
| } |
| } |
| O << ']'; |
| } |
| |
| static bool printAsmMRegister(X86AsmPrinter &P, const MachineOperand &MO, |
| char Mode, raw_ostream &O) { |
| unsigned Reg = MO.getReg(); |
| switch (Mode) { |
| default: return true; // Unknown mode. |
| case 'b': // Print QImode register |
| Reg = getX86SubSuperRegister(Reg, MVT::i8); |
| break; |
| case 'h': // Print QImode high register |
| Reg = getX86SubSuperRegister(Reg, MVT::i8, true); |
| break; |
| case 'w': // Print HImode register |
| Reg = getX86SubSuperRegister(Reg, MVT::i16); |
| break; |
| case 'k': // Print SImode register |
| Reg = getX86SubSuperRegister(Reg, MVT::i32); |
| break; |
| case 'q': |
| // Print 64-bit register names if 64-bit integer registers are available. |
| // Otherwise, print 32-bit register names. |
| MVT::SimpleValueType Ty = P.getSubtarget().is64Bit() ? MVT::i64 : MVT::i32; |
| Reg = getX86SubSuperRegister(Reg, Ty); |
| break; |
| } |
| |
| O << '%' << X86ATTInstPrinter::getRegisterName(Reg); |
| return false; |
| } |
| |
| /// PrintAsmOperand - Print out an operand for an inline asm expression. |
| /// |
| bool X86AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo, |
| unsigned AsmVariant, |
| const char *ExtraCode, raw_ostream &O) { |
| // Does this asm operand have a single letter operand modifier? |
| if (ExtraCode && ExtraCode[0]) { |
| if (ExtraCode[1] != 0) return true; // Unknown modifier. |
| |
| const MachineOperand &MO = MI->getOperand(OpNo); |
| |
| switch (ExtraCode[0]) { |
| default: |
| // See if this is a generic print operand |
| return AsmPrinter::PrintAsmOperand(MI, OpNo, AsmVariant, ExtraCode, O); |
| case 'a': // This is an address. Currently only 'i' and 'r' are expected. |
| switch (MO.getType()) { |
| default: |
| return true; |
| case MachineOperand::MO_Immediate: |
| O << MO.getImm(); |
| return false; |
| case MachineOperand::MO_ConstantPoolIndex: |
| case MachineOperand::MO_JumpTableIndex: |
| case MachineOperand::MO_ExternalSymbol: |
| llvm_unreachable("unexpected operand type!"); |
| case MachineOperand::MO_GlobalAddress: |
| printSymbolOperand(*this, MO, O); |
| if (Subtarget->isPICStyleRIPRel()) |
| O << "(%rip)"; |
| return false; |
| case MachineOperand::MO_Register: |
| O << '('; |
| printOperand(*this, MI, OpNo, O); |
| O << ')'; |
| return false; |
| } |
| |
| case 'c': // Don't print "$" before a global var name or constant. |
| switch (MO.getType()) { |
| default: |
| printOperand(*this, MI, OpNo, O); |
| break; |
| case MachineOperand::MO_Immediate: |
| O << MO.getImm(); |
| break; |
| case MachineOperand::MO_ConstantPoolIndex: |
| case MachineOperand::MO_JumpTableIndex: |
| case MachineOperand::MO_ExternalSymbol: |
| llvm_unreachable("unexpected operand type!"); |
| case MachineOperand::MO_GlobalAddress: |
| printSymbolOperand(*this, MO, O); |
| break; |
| } |
| return false; |
| |
| case 'A': // Print '*' before a register (it must be a register) |
| if (MO.isReg()) { |
| O << '*'; |
| printOperand(*this, MI, OpNo, O); |
| return false; |
| } |
| return true; |
| |
| case 'b': // Print QImode register |
| case 'h': // Print QImode high register |
| case 'w': // Print HImode register |
| case 'k': // Print SImode register |
| case 'q': // Print DImode register |
| if (MO.isReg()) |
| return printAsmMRegister(*this, MO, ExtraCode[0], O); |
| printOperand(*this, MI, OpNo, O); |
| return false; |
| |
| case 'P': // This is the operand of a call, treat specially. |
| printPCRelImm(*this, MI, OpNo, O); |
| return false; |
| |
| case 'n': // Negate the immediate or print a '-' before the operand. |
| // Note: this is a temporary solution. It should be handled target |
| // independently as part of the 'MC' work. |
| if (MO.isImm()) { |
| O << -MO.getImm(); |
| return false; |
| } |
| O << '-'; |
| } |
| } |
| |
| printOperand(*this, MI, OpNo, O, /*Modifier*/ nullptr, AsmVariant); |
| return false; |
| } |
| |
| bool X86AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, |
| unsigned OpNo, unsigned AsmVariant, |
| const char *ExtraCode, |
| raw_ostream &O) { |
| if (AsmVariant) { |
| printIntelMemReference(*this, MI, OpNo, O); |
| return false; |
| } |
| |
| if (ExtraCode && ExtraCode[0]) { |
| if (ExtraCode[1] != 0) return true; // Unknown modifier. |
| |
| switch (ExtraCode[0]) { |
| default: return true; // Unknown modifier. |
| case 'b': // Print QImode register |
| case 'h': // Print QImode high register |
| case 'w': // Print HImode register |
| case 'k': // Print SImode register |
| case 'q': // Print SImode register |
| // These only apply to registers, ignore on mem. |
| break; |
| case 'H': |
| printMemReference(*this, MI, OpNo, O, "H"); |
| return false; |
| case 'P': // Don't print @PLT, but do print as memory. |
| printMemReference(*this, MI, OpNo, O, "no-rip"); |
| return false; |
| } |
| } |
| printMemReference(*this, MI, OpNo, O); |
| return false; |
| } |
| |
| void X86AsmPrinter::EmitStartOfAsmFile(Module &M) { |
| Triple TT(TM.getTargetTriple()); |
| |
| if (TT.isOSBinFormatMachO()) |
| OutStreamer.SwitchSection(getObjFileLowering().getTextSection()); |
| |
| if (TT.isOSBinFormatCOFF()) { |
| // Emit an absolute @feat.00 symbol. This appears to be some kind of |
| // compiler features bitfield read by link.exe. |
| if (TT.getArch() == Triple::x86) { |
| MCSymbol *S = MMI->getContext().GetOrCreateSymbol(StringRef("@feat.00")); |
| OutStreamer.BeginCOFFSymbolDef(S); |
| OutStreamer.EmitCOFFSymbolStorageClass(COFF::IMAGE_SYM_CLASS_STATIC); |
| OutStreamer.EmitCOFFSymbolType(COFF::IMAGE_SYM_DTYPE_NULL); |
| OutStreamer.EndCOFFSymbolDef(); |
| // According to the PE-COFF spec, the LSB of this value marks the object |
| // for "registered SEH". This means that all SEH handler entry points |
| // must be registered in .sxdata. Use of any unregistered handlers will |
| // cause the process to terminate immediately. LLVM does not know how to |
| // register any SEH handlers, so its object files should be safe. |
| OutStreamer.EmitSymbolAttribute(S, MCSA_Global); |
| OutStreamer.EmitAssignment( |
| S, MCConstantExpr::Create(int64_t(1), MMI->getContext())); |
| } |
| } |
| } |
| |
| static void |
| emitNonLazySymbolPointer(MCStreamer &OutStreamer, MCSymbol *StubLabel, |
| MachineModuleInfoImpl::StubValueTy &MCSym) { |
| // L_foo$stub: |
| OutStreamer.EmitLabel(StubLabel); |
| // .indirect_symbol _foo |
| OutStreamer.EmitSymbolAttribute(MCSym.getPointer(), MCSA_IndirectSymbol); |
| |
| if (MCSym.getInt()) |
| // External to current translation unit. |
| OutStreamer.EmitIntValue(0, 4/*size*/); |
| else |
| // Internal to current translation unit. |
| // |
| // When we place the LSDA into the TEXT section, the type info |
| // pointers need to be indirect and pc-rel. We accomplish this by |
| // using NLPs; however, sometimes the types are local to the file. |
| // We need to fill in the value for the NLP in those cases. |
| OutStreamer.EmitValue( |
| MCSymbolRefExpr::Create(MCSym.getPointer(), OutStreamer.getContext()), |
| 4 /*size*/); |
| } |
| |
| MCSymbol *X86AsmPrinter::GetCPISymbol(unsigned CPID) const { |
| if (Subtarget->isTargetKnownWindowsMSVC()) { |
| const MachineConstantPoolEntry &CPE = |
| MF->getConstantPool()->getConstants()[CPID]; |
| if (!CPE.isMachineConstantPoolEntry()) { |
| SectionKind Kind = CPE.getSectionKind(TM.getDataLayout()); |
| const Constant *C = CPE.Val.ConstVal; |
| if (const MCSectionCOFF *S = dyn_cast<MCSectionCOFF>( |
| getObjFileLowering().getSectionForConstant(Kind, C))) { |
| if (MCSymbol *Sym = S->getCOMDATSymbol()) { |
| if (Sym->isUndefined()) |
| OutStreamer.EmitSymbolAttribute(Sym, MCSA_Global); |
| return Sym; |
| } |
| } |
| } |
| } |
| |
| return AsmPrinter::GetCPISymbol(CPID); |
| } |
| |
| void X86AsmPrinter::GenerateExportDirective(const MCSymbol *Sym, bool IsData) { |
| SmallString<128> Directive; |
| raw_svector_ostream OS(Directive); |
| StringRef Name = Sym->getName(); |
| Triple TT(TM.getTargetTriple()); |
| |
| if (TT.isKnownWindowsMSVCEnvironment()) |
| OS << " /EXPORT:"; |
| else |
| OS << " -export:"; |
| |
| if ((TT.isWindowsGNUEnvironment() || TT.isWindowsCygwinEnvironment()) && |
| (Name[0] == getDataLayout().getGlobalPrefix())) |
| Name = Name.drop_front(); |
| |
| OS << Name; |
| |
| if (IsData) { |
| if (TT.isKnownWindowsMSVCEnvironment()) |
| OS << ",DATA"; |
| else |
| OS << ",data"; |
| } |
| |
| OS.flush(); |
| OutStreamer.EmitBytes(Directive); |
| } |
| |
| void X86AsmPrinter::EmitEndOfAsmFile(Module &M) { |
| Triple TT(TM.getTargetTriple()); |
| |
| if (TT.isOSBinFormatMachO()) { |
| // All darwin targets use mach-o. |
| MachineModuleInfoMachO &MMIMacho = |
| MMI->getObjFileInfo<MachineModuleInfoMachO>(); |
| |
| // Output stubs for dynamically-linked functions. |
| MachineModuleInfoMachO::SymbolListTy Stubs; |
| |
| Stubs = MMIMacho.GetFnStubList(); |
| if (!Stubs.empty()) { |
| const MCSection *TheSection = |
| OutContext.getMachOSection("__IMPORT", "__jump_table", |
| MachO::S_SYMBOL_STUBS | |
| MachO::S_ATTR_SELF_MODIFYING_CODE | |
| MachO::S_ATTR_PURE_INSTRUCTIONS, |
| 5, SectionKind::getMetadata()); |
| OutStreamer.SwitchSection(TheSection); |
| |
| for (const auto &Stub : Stubs) { |
| // L_foo$stub: |
| OutStreamer.EmitLabel(Stub.first); |
| // .indirect_symbol _foo |
| OutStreamer.EmitSymbolAttribute(Stub.second.getPointer(), |
| MCSA_IndirectSymbol); |
| // hlt; hlt; hlt; hlt; hlt hlt = 0xf4. |
| const char HltInsts[] = "\xf4\xf4\xf4\xf4\xf4"; |
| OutStreamer.EmitBytes(StringRef(HltInsts, 5)); |
| } |
| |
| Stubs.clear(); |
| OutStreamer.AddBlankLine(); |
| } |
| |
| // Output stubs for external and common global variables. |
| Stubs = MMIMacho.GetGVStubList(); |
| if (!Stubs.empty()) { |
| const MCSection *TheSection = |
| OutContext.getMachOSection("__IMPORT", "__pointers", |
| MachO::S_NON_LAZY_SYMBOL_POINTERS, |
| SectionKind::getMetadata()); |
| OutStreamer.SwitchSection(TheSection); |
| |
| for (auto &Stub : Stubs) |
| emitNonLazySymbolPointer(OutStreamer, Stub.first, Stub.second); |
| |
| Stubs.clear(); |
| OutStreamer.AddBlankLine(); |
| } |
| |
| Stubs = MMIMacho.GetHiddenGVStubList(); |
| if (!Stubs.empty()) { |
| const MCSection *TheSection = |
| OutContext.getMachOSection("__IMPORT", "__pointers", |
| MachO::S_NON_LAZY_SYMBOL_POINTERS, |
| SectionKind::getMetadata()); |
| OutStreamer.SwitchSection(TheSection); |
| |
| for (auto &Stub : Stubs) |
| emitNonLazySymbolPointer(OutStreamer, Stub.first, Stub.second); |
| |
| Stubs.clear(); |
| OutStreamer.AddBlankLine(); |
| } |
| |
| SM.serializeToStackMapSection(); |
| |
| // Funny Darwin hack: This flag tells the linker that no global symbols |
| // contain code that falls through to other global symbols (e.g. the obvious |
| // implementation of multiple entry points). If this doesn't occur, the |
| // linker can safely perform dead code stripping. Since LLVM never |
| // generates code that does this, it is always safe to set. |
| OutStreamer.EmitAssemblerFlag(MCAF_SubsectionsViaSymbols); |
| } |
| |
| if (TT.isKnownWindowsMSVCEnvironment() && MMI->usesVAFloatArgument()) { |
| StringRef SymbolName = |
| (TT.getArch() == Triple::x86_64) ? "_fltused" : "__fltused"; |
| MCSymbol *S = MMI->getContext().GetOrCreateSymbol(SymbolName); |
| OutStreamer.EmitSymbolAttribute(S, MCSA_Global); |
| } |
| |
| if (TT.isOSBinFormatCOFF()) { |
| // Necessary for dllexport support |
| std::vector<const MCSymbol*> DLLExportedFns, DLLExportedGlobals; |
| |
| for (const auto &Function : M) |
| if (Function.hasDLLExportStorageClass() && !Function.isDeclaration()) |
| DLLExportedFns.push_back(getSymbol(&Function)); |
| |
| for (const auto &Global : M.globals()) |
| if (Global.hasDLLExportStorageClass() && !Global.isDeclaration()) |
| DLLExportedGlobals.push_back(getSymbol(&Global)); |
| |
| for (const auto &Alias : M.aliases()) { |
| if (!Alias.hasDLLExportStorageClass()) |
| continue; |
| |
| if (Alias.getType()->getElementType()->isFunctionTy()) |
| DLLExportedFns.push_back(getSymbol(&Alias)); |
| else |
| DLLExportedGlobals.push_back(getSymbol(&Alias)); |
| } |
| |
| // Output linker support code for dllexported globals on windows. |
| if (!DLLExportedGlobals.empty() || !DLLExportedFns.empty()) { |
| const TargetLoweringObjectFileCOFF &TLOFCOFF = |
| static_cast<const TargetLoweringObjectFileCOFF&>(getObjFileLowering()); |
| |
| OutStreamer.SwitchSection(TLOFCOFF.getDrectveSection()); |
| |
| for (auto & Symbol : DLLExportedGlobals) |
| GenerateExportDirective(Symbol, /*IsData=*/true); |
| for (auto & Symbol : DLLExportedFns) |
| GenerateExportDirective(Symbol, /*IsData=*/false); |
| } |
| } |
| |
| if (TT.isOSBinFormatELF()) |
| SM.serializeToStackMapSection(); |
| } |
| |
| //===----------------------------------------------------------------------===// |
| // Target Registry Stuff |
| //===----------------------------------------------------------------------===// |
| |
| // Force static initialization. |
| extern "C" void LLVMInitializeX86AsmPrinter() { |
| RegisterAsmPrinter<X86AsmPrinter> X(TheX86_32Target); |
| RegisterAsmPrinter<X86AsmPrinter> Y(TheX86_64Target); |
| } |
