| //===-- X86ATTAsmPrinter.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 AT&T format assembly |
| // language. This printer is the output mechanism used by `llc'. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #define DEBUG_TYPE "asm-printer" |
| #include "X86ATTAsmPrinter.h" |
| #include "X86.h" |
| #include "X86COFF.h" |
| #include "X86MachineFunctionInfo.h" |
| #include "X86TargetMachine.h" |
| #include "X86TargetAsmInfo.h" |
| #include "llvm/CallingConv.h" |
| #include "llvm/DerivedTypes.h" |
| #include "llvm/Module.h" |
| #include "llvm/Type.h" |
| #include "llvm/ADT/Statistic.h" |
| #include "llvm/ADT/StringExtras.h" |
| #include "llvm/CodeGen/DwarfWriter.h" |
| #include "llvm/CodeGen/MachineJumpTableInfo.h" |
| #include "llvm/Support/Mangler.h" |
| #include "llvm/Support/raw_ostream.h" |
| #include "llvm/Target/TargetAsmInfo.h" |
| #include "llvm/Target/TargetOptions.h" |
| using namespace llvm; |
| |
| STATISTIC(EmittedInsts, "Number of machine instrs printed"); |
| |
| static std::string getPICLabelString(unsigned FnNum, |
| const TargetAsmInfo *TAI, |
| const X86Subtarget* Subtarget) { |
| std::string label; |
| if (Subtarget->isTargetDarwin()) |
| label = "\"L" + utostr_32(FnNum) + "$pb\""; |
| else if (Subtarget->isTargetELF()) |
| label = ".Lllvm$" + utostr_32(FnNum) + "." "$piclabel"; |
| else |
| assert(0 && "Don't know how to print PIC label!\n"); |
| |
| return label; |
| } |
| |
| static X86MachineFunctionInfo calculateFunctionInfo(const Function *F, |
| const TargetData *TD) { |
| X86MachineFunctionInfo Info; |
| uint64_t Size = 0; |
| |
| switch (F->getCallingConv()) { |
| case CallingConv::X86_StdCall: |
| Info.setDecorationStyle(StdCall); |
| break; |
| case CallingConv::X86_FastCall: |
| Info.setDecorationStyle(FastCall); |
| break; |
| default: |
| return Info; |
| } |
| |
| unsigned argNum = 1; |
| for (Function::const_arg_iterator AI = F->arg_begin(), AE = F->arg_end(); |
| AI != AE; ++AI, ++argNum) { |
| const Type* Ty = AI->getType(); |
| |
| // 'Dereference' type in case of byval parameter attribute |
| if (F->paramHasAttr(argNum, Attribute::ByVal)) |
| Ty = cast<PointerType>(Ty)->getElementType(); |
| |
| // Size should be aligned to DWORD boundary |
| Size += ((TD->getTypePaddedSize(Ty) + 3)/4)*4; |
| } |
| |
| // We're not supporting tooooo huge arguments :) |
| Info.setBytesToPopOnReturn((unsigned int)Size); |
| return Info; |
| } |
| |
| /// PrintUnmangledNameSafely - Print out the printable characters in the name. |
| /// Don't print things like \\n or \\0. |
| static void PrintUnmangledNameSafely(const Value *V, raw_ostream &OS) { |
| for (const char *Name = V->getNameStart(), *E = Name+V->getNameLen(); |
| Name != E; ++Name) |
| if (isprint(*Name)) |
| OS << *Name; |
| } |
| |
| /// decorateName - Query FunctionInfoMap and use this information for various |
| /// name decoration. |
| void X86ATTAsmPrinter::decorateName(std::string &Name, |
| const GlobalValue *GV) { |
| const Function *F = dyn_cast<Function>(GV); |
| if (!F) return; |
| |
| // We don't want to decorate non-stdcall or non-fastcall functions right now |
| unsigned CC = F->getCallingConv(); |
| if (CC != CallingConv::X86_StdCall && CC != CallingConv::X86_FastCall) |
| return; |
| |
| // Decorate names only when we're targeting Cygwin/Mingw32 targets |
| if (!Subtarget->isTargetCygMing()) |
| return; |
| |
| FMFInfoMap::const_iterator info_item = FunctionInfoMap.find(F); |
| |
| const X86MachineFunctionInfo *Info; |
| if (info_item == FunctionInfoMap.end()) { |
| // Calculate apropriate function info and populate map |
| FunctionInfoMap[F] = calculateFunctionInfo(F, TM.getTargetData()); |
| Info = &FunctionInfoMap[F]; |
| } else { |
| Info = &info_item->second; |
| } |
| |
| const FunctionType *FT = F->getFunctionType(); |
| switch (Info->getDecorationStyle()) { |
| case None: |
| break; |
| case StdCall: |
| // "Pure" variadic functions do not receive @0 suffix. |
| if (!FT->isVarArg() || (FT->getNumParams() == 0) || |
| (FT->getNumParams() == 1 && F->hasStructRetAttr())) |
| Name += '@' + utostr_32(Info->getBytesToPopOnReturn()); |
| break; |
| case FastCall: |
| // "Pure" variadic functions do not receive @0 suffix. |
| if (!FT->isVarArg() || (FT->getNumParams() == 0) || |
| (FT->getNumParams() == 1 && F->hasStructRetAttr())) |
| Name += '@' + utostr_32(Info->getBytesToPopOnReturn()); |
| |
| if (Name[0] == '_') { |
| Name[0] = '@'; |
| } else { |
| Name = '@' + Name; |
| } |
| break; |
| default: |
| assert(0 && "Unsupported DecorationStyle"); |
| } |
| } |
| |
| void X86ATTAsmPrinter::emitFunctionHeader(const MachineFunction &MF) { |
| const Function *F = MF.getFunction(); |
| |
| decorateName(CurrentFnName, F); |
| |
| SwitchToSection(TAI->SectionForGlobal(F)); |
| |
| unsigned FnAlign = 4; |
| if (F->hasFnAttr(Attribute::OptimizeForSize)) |
| FnAlign = 1; |
| switch (F->getLinkage()) { |
| default: assert(0 && "Unknown linkage type!"); |
| case Function::InternalLinkage: // Symbols default to internal. |
| case Function::PrivateLinkage: |
| EmitAlignment(FnAlign, F); |
| break; |
| case Function::DLLExportLinkage: |
| case Function::ExternalLinkage: |
| EmitAlignment(FnAlign, F); |
| O << "\t.globl\t" << CurrentFnName << '\n'; |
| break; |
| case Function::LinkOnceAnyLinkage: |
| case Function::LinkOnceODRLinkage: |
| case Function::WeakAnyLinkage: |
| case Function::WeakODRLinkage: |
| EmitAlignment(FnAlign, F); |
| if (Subtarget->isTargetDarwin()) { |
| O << "\t.globl\t" << CurrentFnName << '\n'; |
| O << TAI->getWeakDefDirective() << CurrentFnName << '\n'; |
| } else if (Subtarget->isTargetCygMing()) { |
| O << "\t.globl\t" << CurrentFnName << "\n" |
| "\t.linkonce discard\n"; |
| } else { |
| O << "\t.weak\t" << CurrentFnName << '\n'; |
| } |
| break; |
| } |
| |
| printVisibility(CurrentFnName, F->getVisibility()); |
| |
| if (Subtarget->isTargetELF()) |
| O << "\t.type\t" << CurrentFnName << ",@function\n"; |
| else if (Subtarget->isTargetCygMing()) { |
| O << "\t.def\t " << CurrentFnName |
| << ";\t.scl\t" << |
| (F->hasInternalLinkage() ? COFF::C_STAT : COFF::C_EXT) |
| << ";\t.type\t" << (COFF::DT_FCN << COFF::N_BTSHFT) |
| << ";\t.endef\n"; |
| } |
| |
| O << CurrentFnName << ":\n"; |
| // Add some workaround for linkonce linkage on Cygwin\MinGW |
| if (Subtarget->isTargetCygMing() && |
| (F->hasLinkOnceLinkage() || F->hasWeakLinkage())) |
| O << "Lllvm$workaround$fake$stub$" << CurrentFnName << ":\n"; |
| } |
| |
| /// runOnMachineFunction - This uses the printMachineInstruction() |
| /// method to print assembly for each instruction. |
| /// |
| bool X86ATTAsmPrinter::runOnMachineFunction(MachineFunction &MF) { |
| const Function *F = MF.getFunction(); |
| this->MF = &MF; |
| unsigned CC = F->getCallingConv(); |
| |
| SetupMachineFunction(MF); |
| O << "\n\n"; |
| |
| // Populate function information map. Actually, We don't want to populate |
| // non-stdcall or non-fastcall functions' information right now. |
| if (CC == CallingConv::X86_StdCall || CC == CallingConv::X86_FastCall) |
| FunctionInfoMap[F] = *MF.getInfo<X86MachineFunctionInfo>(); |
| |
| // Print out constants referenced by the function |
| EmitConstantPool(MF.getConstantPool()); |
| |
| if (F->hasDLLExportLinkage()) |
| DLLExportedFns.insert(Mang->makeNameProper(F->getName(), "")); |
| |
| // Print the 'header' of function |
| emitFunctionHeader(MF); |
| |
| // Emit pre-function debug and/or EH information. |
| if (TAI->doesSupportDebugInformation() || TAI->doesSupportExceptionHandling()) |
| DW->BeginFunction(&MF); |
| |
| // Print out code for the function. |
| bool hasAnyRealCode = false; |
| for (MachineFunction::const_iterator I = MF.begin(), E = MF.end(); |
| I != E; ++I) { |
| // Print a label for the basic block. |
| if (!VerboseAsm && (I->pred_empty() || I->isOnlyReachableByFallthrough())) { |
| // This is an entry block or a block that's only reachable via a |
| // fallthrough edge. In non-VerboseAsm mode, don't print the label. |
| } else { |
| printBasicBlockLabel(I, true, true, VerboseAsm); |
| O << '\n'; |
| } |
| for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end(); |
| II != IE; ++II) { |
| // Print the assembly for the instruction. |
| if (!II->isLabel()) |
| hasAnyRealCode = true; |
| printMachineInstruction(II); |
| } |
| } |
| |
| if (Subtarget->isTargetDarwin() && !hasAnyRealCode) { |
| // If the function is empty, then we need to emit *something*. Otherwise, |
| // the function's label might be associated with something that it wasn't |
| // meant to be associated with. We emit a noop in this situation. |
| // We are assuming inline asms are code. |
| O << "\tnop\n"; |
| } |
| |
| if (TAI->hasDotTypeDotSizeDirective()) |
| O << "\t.size\t" << CurrentFnName << ", .-" << CurrentFnName << '\n'; |
| |
| // Emit post-function debug information. |
| if (TAI->doesSupportDebugInformation()) |
| DW->EndFunction(&MF); |
| |
| // Print out jump tables referenced by the function. |
| EmitJumpTableInfo(MF.getJumpTableInfo(), MF); |
| |
| O.flush(); |
| |
| // We didn't modify anything. |
| return false; |
| } |
| |
| static inline bool shouldPrintGOT(TargetMachine &TM, const X86Subtarget* ST) { |
| return ST->isPICStyleGOT() && TM.getRelocationModel() == Reloc::PIC_; |
| } |
| |
| static inline bool shouldPrintPLT(TargetMachine &TM, const X86Subtarget* ST) { |
| return ST->isTargetELF() && TM.getRelocationModel() == Reloc::PIC_ && |
| (ST->isPICStyleRIPRel() || ST->isPICStyleGOT()); |
| } |
| |
| static inline bool shouldPrintStub(TargetMachine &TM, const X86Subtarget* ST) { |
| return ST->isPICStyleStub() && TM.getRelocationModel() != Reloc::Static; |
| } |
| |
| void X86ATTAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo, |
| const char *Modifier, bool NotRIPRel) { |
| const MachineOperand &MO = MI->getOperand(OpNo); |
| switch (MO.getType()) { |
| case MachineOperand::MO_Register: { |
| assert(TargetRegisterInfo::isPhysicalRegister(MO.getReg()) && |
| "Virtual registers should not make it this far!"); |
| O << '%'; |
| unsigned Reg = MO.getReg(); |
| if (Modifier && strncmp(Modifier, "subreg", strlen("subreg")) == 0) { |
| MVT 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 << TRI->getAsmName(Reg); |
| return; |
| } |
| |
| case MachineOperand::MO_Immediate: |
| if (!Modifier || (strcmp(Modifier, "debug") && |
| strcmp(Modifier, "mem") && |
| strcmp(Modifier, "call"))) |
| O << '$'; |
| O << MO.getImm(); |
| return; |
| case MachineOperand::MO_MachineBasicBlock: |
| printBasicBlockLabel(MO.getMBB(), false, false, VerboseAsm); |
| return; |
| case MachineOperand::MO_JumpTableIndex: { |
| bool isMemOp = Modifier && !strcmp(Modifier, "mem"); |
| if (!isMemOp) O << '$'; |
| O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() << '_' |
| << MO.getIndex(); |
| |
| if (TM.getRelocationModel() == Reloc::PIC_) { |
| if (Subtarget->isPICStyleStub()) |
| O << "-\"" << TAI->getPrivateGlobalPrefix() << getFunctionNumber() |
| << "$pb\""; |
| else if (Subtarget->isPICStyleGOT()) |
| O << "@GOTOFF"; |
| } |
| |
| if (isMemOp && Subtarget->isPICStyleRIPRel() && !NotRIPRel) |
| O << "(%rip)"; |
| return; |
| } |
| case MachineOperand::MO_ConstantPoolIndex: { |
| bool isMemOp = Modifier && !strcmp(Modifier, "mem"); |
| if (!isMemOp) O << '$'; |
| O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_' |
| << MO.getIndex(); |
| |
| if (TM.getRelocationModel() == Reloc::PIC_) { |
| if (Subtarget->isPICStyleStub()) |
| O << "-\"" << TAI->getPrivateGlobalPrefix() << getFunctionNumber() |
| << "$pb\""; |
| else if (Subtarget->isPICStyleGOT()) |
| O << "@GOTOFF"; |
| } |
| |
| printOffset(MO.getOffset()); |
| |
| if (isMemOp && Subtarget->isPICStyleRIPRel() && !NotRIPRel) |
| O << "(%rip)"; |
| return; |
| } |
| case MachineOperand::MO_GlobalAddress: { |
| bool isCallOp = Modifier && !strcmp(Modifier, "call"); |
| bool isMemOp = Modifier && !strcmp(Modifier, "mem"); |
| bool needCloseParen = false; |
| |
| const GlobalValue *GV = MO.getGlobal(); |
| const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV); |
| if (!GVar) { |
| // If GV is an alias then use the aliasee for determining |
| // thread-localness. |
| if (const GlobalAlias *GA = dyn_cast<GlobalAlias>(GV)) |
| GVar = dyn_cast_or_null<GlobalVariable>(GA->resolveAliasedGlobal(false)); |
| } |
| |
| bool isThreadLocal = GVar && GVar->isThreadLocal(); |
| |
| std::string Name = Mang->getValueName(GV); |
| decorateName(Name, GV); |
| |
| if (!isMemOp && !isCallOp) |
| O << '$'; |
| else if (Name[0] == '$') { |
| // The name begins with a dollar-sign. In order to avoid having it look |
| // like an integer immediate to the assembler, enclose it in parens. |
| O << '('; |
| needCloseParen = true; |
| } |
| |
| if (shouldPrintStub(TM, Subtarget)) { |
| // Link-once, declaration, or Weakly-linked global variables need |
| // non-lazily-resolved stubs |
| if (GV->isDeclaration() || GV->isWeakForLinker()) { |
| // Dynamically-resolved functions need a stub for the function. |
| if (isCallOp && isa<Function>(GV)) { |
| // Function stubs are no longer needed for Mac OS X 10.5 and up. |
| if (Subtarget->isTargetDarwin() && Subtarget->getDarwinVers() >= 9) { |
| O << Name; |
| } else { |
| FnStubs.insert(Name); |
| printSuffixedName(Name, "$stub"); |
| } |
| } else if (GV->hasHiddenVisibility()) { |
| if (!GV->isDeclaration() && !GV->hasCommonLinkage()) |
| // Definition is not definitely in the current translation unit. |
| O << Name; |
| else { |
| HiddenGVStubs.insert(Name); |
| printSuffixedName(Name, "$non_lazy_ptr"); |
| } |
| } else { |
| GVStubs.insert(Name); |
| printSuffixedName(Name, "$non_lazy_ptr"); |
| } |
| } else { |
| if (GV->hasDLLImportLinkage()) |
| O << "__imp_"; |
| O << Name; |
| } |
| |
| if (!isCallOp && TM.getRelocationModel() == Reloc::PIC_) |
| O << '-' << getPICLabelString(getFunctionNumber(), TAI, Subtarget); |
| } else { |
| if (GV->hasDLLImportLinkage()) { |
| O << "__imp_"; |
| } |
| O << Name; |
| |
| if (isCallOp) { |
| if (shouldPrintPLT(TM, Subtarget)) { |
| // Assemble call via PLT for externally visible symbols |
| if (!GV->hasHiddenVisibility() && !GV->hasProtectedVisibility() && |
| !GV->hasLocalLinkage()) |
| O << "@PLT"; |
| } |
| if (Subtarget->isTargetCygMing() && GV->isDeclaration()) |
| // Save function name for later type emission |
| FnStubs.insert(Name); |
| } |
| } |
| |
| if (GV->hasExternalWeakLinkage()) |
| ExtWeakSymbols.insert(GV); |
| |
| printOffset(MO.getOffset()); |
| |
| if (isThreadLocal) { |
| TLSModel::Model model = getTLSModel(GVar, TM.getRelocationModel()); |
| switch (model) { |
| case TLSModel::GeneralDynamic: |
| O << "@TLSGD"; |
| break; |
| case TLSModel::LocalDynamic: |
| // O << "@TLSLD"; // local dynamic not implemented |
| O << "@TLSGD"; |
| break; |
| case TLSModel::InitialExec: |
| if (Subtarget->is64Bit()) |
| O << "@TLSGD"; // 64 bit intial exec not implemented |
| else |
| O << "@INDNTPOFF"; |
| break; |
| case TLSModel::LocalExec: |
| if (Subtarget->is64Bit()) |
| O << "@TLSGD"; // 64 bit local exec not implemented |
| else |
| O << "@NTPOFF"; |
| break; |
| default: |
| assert (0 && "Unknown TLS model"); |
| } |
| } else if (isMemOp) { |
| if (shouldPrintGOT(TM, Subtarget)) { |
| if (Subtarget->GVRequiresExtraLoad(GV, TM, false)) |
| O << "@GOT"; |
| else |
| O << "@GOTOFF"; |
| } else if (Subtarget->isPICStyleRIPRel() && !NotRIPRel) { |
| if (TM.getRelocationModel() != Reloc::Static) { |
| if (Subtarget->GVRequiresExtraLoad(GV, TM, false)) |
| O << "@GOTPCREL"; |
| |
| if (needCloseParen) { |
| needCloseParen = false; |
| O << ')'; |
| } |
| } |
| |
| // Use rip when possible to reduce code size, except when |
| // index or base register are also part of the address. e.g. |
| // foo(%rip)(%rcx,%rax,4) is not legal |
| O << "(%rip)"; |
| } |
| } |
| |
| if (needCloseParen) |
| O << ')'; |
| |
| return; |
| } |
| case MachineOperand::MO_ExternalSymbol: { |
| bool isCallOp = Modifier && !strcmp(Modifier, "call"); |
| bool needCloseParen = false; |
| std::string Name(TAI->getGlobalPrefix()); |
| Name += MO.getSymbolName(); |
| // Print function stub suffix unless it's Mac OS X 10.5 and up. |
| if (isCallOp && shouldPrintStub(TM, Subtarget) && |
| !(Subtarget->isTargetDarwin() && Subtarget->getDarwinVers() >= 9)) { |
| FnStubs.insert(Name); |
| printSuffixedName(Name, "$stub"); |
| return; |
| } |
| if (!isCallOp) |
| O << '$'; |
| else if (Name[0] == '$') { |
| // The name begins with a dollar-sign. In order to avoid having it look |
| // like an integer immediate to the assembler, enclose it in parens. |
| O << '('; |
| needCloseParen = true; |
| } |
| |
| O << Name; |
| |
| if (shouldPrintPLT(TM, Subtarget)) { |
| std::string GOTName(TAI->getGlobalPrefix()); |
| GOTName+="_GLOBAL_OFFSET_TABLE_"; |
| if (Name == GOTName) |
| // HACK! Emit extra offset to PC during printing GOT offset to |
| // compensate for the size of popl instruction. The resulting code |
| // should look like: |
| // call .piclabel |
| // piclabel: |
| // popl %some_register |
| // addl $_GLOBAL_ADDRESS_TABLE_ + [.-piclabel], %some_register |
| O << " + [.-" |
| << getPICLabelString(getFunctionNumber(), TAI, Subtarget) << ']'; |
| |
| if (isCallOp) |
| O << "@PLT"; |
| } |
| |
| if (needCloseParen) |
| O << ')'; |
| |
| if (!isCallOp && Subtarget->isPICStyleRIPRel()) |
| O << "(%rip)"; |
| |
| return; |
| } |
| default: |
| O << "<unknown operand type>"; return; |
| } |
| } |
| |
| void X86ATTAsmPrinter::printSSECC(const MachineInstr *MI, unsigned Op) { |
| unsigned char value = MI->getOperand(Op).getImm(); |
| assert(value <= 7 && "Invalid ssecc argument!"); |
| switch (value) { |
| case 0: O << "eq"; break; |
| case 1: O << "lt"; break; |
| case 2: O << "le"; break; |
| case 3: O << "unord"; break; |
| case 4: O << "neq"; break; |
| case 5: O << "nlt"; break; |
| case 6: O << "nle"; break; |
| case 7: O << "ord"; break; |
| } |
| } |
| |
| void X86ATTAsmPrinter::printLeaMemReference(const MachineInstr *MI, unsigned Op, |
| const char *Modifier){ |
| MachineOperand BaseReg = MI->getOperand(Op); |
| MachineOperand IndexReg = MI->getOperand(Op+2); |
| const MachineOperand &DispSpec = MI->getOperand(Op+3); |
| |
| bool NotRIPRel = IndexReg.getReg() || BaseReg.getReg(); |
| if (DispSpec.isGlobal() || |
| DispSpec.isCPI() || |
| DispSpec.isJTI()) { |
| printOperand(MI, Op+3, "mem", NotRIPRel); |
| } else { |
| int DispVal = DispSpec.getImm(); |
| if (DispVal || (!IndexReg.getReg() && !BaseReg.getReg())) |
| O << DispVal; |
| } |
| |
| if (IndexReg.getReg() || BaseReg.getReg()) { |
| unsigned ScaleVal = MI->getOperand(Op+1).getImm(); |
| unsigned BaseRegOperand = 0, IndexRegOperand = 2; |
| |
| // There are cases where we can end up with ESP/RSP in the indexreg slot. |
| // If this happens, swap the base/index register to support assemblers that |
| // don't work when the index is *SP. |
| if (IndexReg.getReg() == X86::ESP || IndexReg.getReg() == X86::RSP) { |
| assert(ScaleVal == 1 && "Scale not supported for stack pointer!"); |
| std::swap(BaseReg, IndexReg); |
| std::swap(BaseRegOperand, IndexRegOperand); |
| } |
| |
| O << '('; |
| if (BaseReg.getReg()) |
| printOperand(MI, Op+BaseRegOperand, Modifier); |
| |
| if (IndexReg.getReg()) { |
| O << ','; |
| printOperand(MI, Op+IndexRegOperand, Modifier); |
| if (ScaleVal != 1) |
| O << ',' << ScaleVal; |
| } |
| O << ')'; |
| } |
| } |
| |
| void X86ATTAsmPrinter::printMemReference(const MachineInstr *MI, unsigned Op, |
| const char *Modifier){ |
| assert(isMem(MI, Op) && "Invalid memory reference!"); |
| MachineOperand Segment = MI->getOperand(Op+4); |
| if (Segment.getReg()) { |
| printOperand(MI, Op+4, Modifier); |
| O << ':'; |
| } |
| printLeaMemReference(MI, Op, Modifier); |
| } |
| |
| void X86ATTAsmPrinter::printPICJumpTableSetLabel(unsigned uid, |
| const MachineBasicBlock *MBB) const { |
| if (!TAI->getSetDirective()) |
| return; |
| |
| // We don't need .set machinery if we have GOT-style relocations |
| if (Subtarget->isPICStyleGOT()) |
| return; |
| |
| O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix() |
| << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ','; |
| printBasicBlockLabel(MBB, false, false, false); |
| if (Subtarget->isPICStyleRIPRel()) |
| O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() |
| << '_' << uid << '\n'; |
| else |
| O << '-' << getPICLabelString(getFunctionNumber(), TAI, Subtarget) << '\n'; |
| } |
| |
| void X86ATTAsmPrinter::printPICLabel(const MachineInstr *MI, unsigned Op) { |
| std::string label = getPICLabelString(getFunctionNumber(), TAI, Subtarget); |
| O << label << '\n' << label << ':'; |
| } |
| |
| |
| void X86ATTAsmPrinter::printPICJumpTableEntry(const MachineJumpTableInfo *MJTI, |
| const MachineBasicBlock *MBB, |
| unsigned uid) const |
| { |
| const char *JTEntryDirective = MJTI->getEntrySize() == 4 ? |
| TAI->getData32bitsDirective() : TAI->getData64bitsDirective(); |
| |
| O << JTEntryDirective << ' '; |
| |
| if (TM.getRelocationModel() == Reloc::PIC_) { |
| if (Subtarget->isPICStyleRIPRel() || Subtarget->isPICStyleStub()) { |
| O << TAI->getPrivateGlobalPrefix() << getFunctionNumber() |
| << '_' << uid << "_set_" << MBB->getNumber(); |
| } else if (Subtarget->isPICStyleGOT()) { |
| printBasicBlockLabel(MBB, false, false, false); |
| O << "@GOTOFF"; |
| } else |
| assert(0 && "Don't know how to print MBB label for this PIC mode"); |
| } else |
| printBasicBlockLabel(MBB, false, false, false); |
| } |
| |
| bool X86ATTAsmPrinter::printAsmMRegister(const MachineOperand &MO, |
| const char Mode) { |
| 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 DImode register |
| Reg = getX86SubSuperRegister(Reg, MVT::i64); |
| break; |
| } |
| |
| O << '%'<< TRI->getAsmName(Reg); |
| return false; |
| } |
| |
| /// PrintAsmOperand - Print out an operand for an inline asm expression. |
| /// |
| bool X86ATTAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo, |
| unsigned AsmVariant, |
| const char *ExtraCode) { |
| // Does this asm operand have a single letter operand modifier? |
| if (ExtraCode && ExtraCode[0]) { |
| if (ExtraCode[1] != 0) return true; // Unknown modifier. |
| |
| switch (ExtraCode[0]) { |
| default: return true; // Unknown modifier. |
| case 'c': // Don't print "$" before a global var name or constant. |
| printOperand(MI, OpNo, "mem", /*NotRIPRel=*/true); |
| return false; |
| 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 (MI->getOperand(OpNo).isReg()) |
| return printAsmMRegister(MI->getOperand(OpNo), ExtraCode[0]); |
| printOperand(MI, OpNo); |
| return false; |
| |
| case 'P': // Don't print @PLT, but do print as memory. |
| printOperand(MI, OpNo, "mem"); |
| return false; |
| } |
| } |
| |
| printOperand(MI, OpNo); |
| return false; |
| } |
| |
| bool X86ATTAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, |
| unsigned OpNo, |
| unsigned AsmVariant, |
| const char *ExtraCode) { |
| 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 'P': // Don't print @PLT, but do print as memory. |
| printOperand(MI, OpNo, "mem"); |
| return false; |
| } |
| } |
| printMemReference(MI, OpNo); |
| return false; |
| } |
| |
| /// printMachineInstruction -- Print out a single X86 LLVM instruction MI in |
| /// AT&T syntax to the current output stream. |
| /// |
| void X86ATTAsmPrinter::printMachineInstruction(const MachineInstr *MI) { |
| ++EmittedInsts; |
| |
| // Call the autogenerated instruction printer routines. |
| printInstruction(MI); |
| } |
| |
| /// doInitialization |
| bool X86ATTAsmPrinter::doInitialization(Module &M) { |
| |
| bool Result = AsmPrinter::doInitialization(M); |
| |
| if (TAI->doesSupportDebugInformation()) { |
| // Let PassManager know we need debug information and relay |
| // the MachineModuleInfo address on to DwarfWriter. |
| // AsmPrinter::doInitialization did this analysis. |
| MMI = getAnalysisIfAvailable<MachineModuleInfo>(); |
| DW = getAnalysisIfAvailable<DwarfWriter>(); |
| DW->BeginModule(&M, MMI, O, this, TAI); |
| } |
| |
| // Darwin wants symbols to be quoted if they have complex names. |
| if (Subtarget->isTargetDarwin()) |
| Mang->setUseQuotes(true); |
| |
| return Result; |
| } |
| |
| |
| void X86ATTAsmPrinter::printModuleLevelGV(const GlobalVariable* GVar) { |
| const TargetData *TD = TM.getTargetData(); |
| |
| if (!GVar->hasInitializer()) |
| return; // External global require no code |
| |
| // Check to see if this is a special global used by LLVM, if so, emit it. |
| if (EmitSpecialLLVMGlobal(GVar)) { |
| if (Subtarget->isTargetDarwin() && |
| TM.getRelocationModel() == Reloc::Static) { |
| if (GVar->getName() == "llvm.global_ctors") |
| O << ".reference .constructors_used\n"; |
| else if (GVar->getName() == "llvm.global_dtors") |
| O << ".reference .destructors_used\n"; |
| } |
| return; |
| } |
| |
| std::string name = Mang->getValueName(GVar); |
| Constant *C = GVar->getInitializer(); |
| const Type *Type = C->getType(); |
| unsigned Size = TD->getTypePaddedSize(Type); |
| unsigned Align = TD->getPreferredAlignmentLog(GVar); |
| |
| printVisibility(name, GVar->getVisibility()); |
| |
| if (Subtarget->isTargetELF()) |
| O << "\t.type\t" << name << ",@object\n"; |
| |
| SwitchToSection(TAI->SectionForGlobal(GVar)); |
| |
| if (C->isNullValue() && !GVar->hasSection() && |
| !(Subtarget->isTargetDarwin() && |
| TAI->SectionKindForGlobal(GVar) == SectionKind::RODataMergeStr)) { |
| // FIXME: This seems to be pretty darwin-specific |
| if (GVar->hasExternalLinkage()) { |
| if (const char *Directive = TAI->getZeroFillDirective()) { |
| O << "\t.globl " << name << '\n'; |
| O << Directive << "__DATA, __common, " << name << ", " |
| << Size << ", " << Align << '\n'; |
| return; |
| } |
| } |
| |
| if (!GVar->isThreadLocal() && |
| (GVar->hasLocalLinkage() || GVar->isWeakForLinker())) { |
| if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it. |
| |
| if (TAI->getLCOMMDirective() != NULL) { |
| if (GVar->hasLocalLinkage()) { |
| O << TAI->getLCOMMDirective() << name << ',' << Size; |
| if (Subtarget->isTargetDarwin()) |
| O << ',' << Align; |
| } else if (Subtarget->isTargetDarwin() && !GVar->hasCommonLinkage()) { |
| O << "\t.globl " << name << '\n' |
| << TAI->getWeakDefDirective() << name << '\n'; |
| EmitAlignment(Align, GVar); |
| O << name << ":"; |
| if (VerboseAsm) { |
| O << "\t\t\t\t" << TAI->getCommentString() << ' '; |
| PrintUnmangledNameSafely(GVar, O); |
| } |
| O << '\n'; |
| EmitGlobalConstant(C); |
| return; |
| } else { |
| O << TAI->getCOMMDirective() << name << ',' << Size; |
| if (TAI->getCOMMDirectiveTakesAlignment()) |
| O << ',' << (TAI->getAlignmentIsInBytes() ? (1 << Align) : Align); |
| } |
| } else { |
| if (!Subtarget->isTargetCygMing()) { |
| if (GVar->hasLocalLinkage()) |
| O << "\t.local\t" << name << '\n'; |
| } |
| O << TAI->getCOMMDirective() << name << ',' << Size; |
| if (TAI->getCOMMDirectiveTakesAlignment()) |
| O << ',' << (TAI->getAlignmentIsInBytes() ? (1 << Align) : Align); |
| } |
| if (VerboseAsm) { |
| O << "\t\t" << TAI->getCommentString() << ' '; |
| PrintUnmangledNameSafely(GVar, O); |
| } |
| O << '\n'; |
| return; |
| } |
| } |
| |
| switch (GVar->getLinkage()) { |
| case GlobalValue::CommonLinkage: |
| case GlobalValue::LinkOnceAnyLinkage: |
| case GlobalValue::LinkOnceODRLinkage: |
| case GlobalValue::WeakAnyLinkage: |
| case GlobalValue::WeakODRLinkage: |
| if (Subtarget->isTargetDarwin()) { |
| O << "\t.globl " << name << '\n' |
| << TAI->getWeakDefDirective() << name << '\n'; |
| } else if (Subtarget->isTargetCygMing()) { |
| O << "\t.globl\t" << name << "\n" |
| "\t.linkonce same_size\n"; |
| } else { |
| O << "\t.weak\t" << name << '\n'; |
| } |
| break; |
| case GlobalValue::DLLExportLinkage: |
| case GlobalValue::AppendingLinkage: |
| // FIXME: appending linkage variables should go into a section of |
| // their name or something. For now, just emit them as external. |
| case GlobalValue::ExternalLinkage: |
| // If external or appending, declare as a global symbol |
| O << "\t.globl " << name << '\n'; |
| // FALL THROUGH |
| case GlobalValue::PrivateLinkage: |
| case GlobalValue::InternalLinkage: |
| break; |
| default: |
| assert(0 && "Unknown linkage type!"); |
| } |
| |
| EmitAlignment(Align, GVar); |
| O << name << ":"; |
| if (VerboseAsm){ |
| O << "\t\t\t\t" << TAI->getCommentString() << ' '; |
| PrintUnmangledNameSafely(GVar, O); |
| } |
| O << '\n'; |
| if (TAI->hasDotTypeDotSizeDirective()) |
| O << "\t.size\t" << name << ", " << Size << '\n'; |
| |
| EmitGlobalConstant(C); |
| } |
| |
| /// printGVStub - Print stub for a global value. |
| /// |
| void X86ATTAsmPrinter::printGVStub(const char *GV, const char *Prefix) { |
| printSuffixedName(GV, "$non_lazy_ptr", Prefix); |
| O << ":\n\t.indirect_symbol "; |
| if (Prefix) O << Prefix; |
| O << GV << "\n\t.long\t0\n"; |
| } |
| |
| /// printHiddenGVStub - Print stub for a hidden global value. |
| /// |
| void X86ATTAsmPrinter::printHiddenGVStub(const char *GV, const char *Prefix) { |
| EmitAlignment(2); |
| printSuffixedName(GV, "$non_lazy_ptr", Prefix); |
| if (Prefix) O << Prefix; |
| O << ":\n" << TAI->getData32bitsDirective() << GV << '\n'; |
| } |
| |
| |
| bool X86ATTAsmPrinter::doFinalization(Module &M) { |
| // Print out module-level global variables here. |
| for (Module::const_global_iterator I = M.global_begin(), E = M.global_end(); |
| I != E; ++I) { |
| printModuleLevelGV(I); |
| |
| if (I->hasDLLExportLinkage()) |
| DLLExportedGVs.insert(Mang->makeNameProper(I->getName(),"")); |
| |
| // If the global is a extern weak symbol, remember to emit the weak |
| // reference! |
| // FIXME: This is rather hacky, since we'll emit references to ALL weak stuff, |
| // not used. But currently it's the only way to deal with extern weak |
| // initializers hidden deep inside constant expressions. |
| if (I->hasExternalWeakLinkage()) |
| ExtWeakSymbols.insert(I); |
| } |
| |
| for (Module::const_iterator I = M.begin(), E = M.end(); |
| I != E; ++I) { |
| // If the global is a extern weak symbol, remember to emit the weak |
| // reference! |
| // FIXME: This is rather hacky, since we'll emit references to ALL weak stuff, |
| // not used. But currently it's the only way to deal with extern weak |
| // initializers hidden deep inside constant expressions. |
| if (I->hasExternalWeakLinkage()) |
| ExtWeakSymbols.insert(I); |
| } |
| |
| // Output linker support code for dllexported globals |
| if (!DLLExportedGVs.empty()) |
| SwitchToDataSection(".section .drectve"); |
| |
| for (StringSet<>::iterator i = DLLExportedGVs.begin(), |
| e = DLLExportedGVs.end(); |
| i != e; ++i) |
| O << "\t.ascii \" -export:" << i->getKeyData() << ",data\"\n"; |
| |
| if (!DLLExportedFns.empty()) { |
| SwitchToDataSection(".section .drectve"); |
| } |
| |
| for (StringSet<>::iterator i = DLLExportedFns.begin(), |
| e = DLLExportedFns.end(); |
| i != e; ++i) |
| O << "\t.ascii \" -export:" << i->getKeyData() << "\"\n"; |
| |
| if (Subtarget->isTargetDarwin()) { |
| SwitchToDataSection(""); |
| |
| // Output stubs for dynamically-linked functions |
| for (StringSet<>::iterator i = FnStubs.begin(), e = FnStubs.end(); |
| i != e; ++i) { |
| SwitchToDataSection("\t.section __IMPORT,__jump_table,symbol_stubs," |
| "self_modifying_code+pure_instructions,5", 0); |
| const char *p = i->getKeyData(); |
| printSuffixedName(p, "$stub"); |
| O << ":\n" |
| "\t.indirect_symbol " << p << "\n" |
| "\thlt ; hlt ; hlt ; hlt ; hlt\n"; |
| } |
| |
| O << '\n'; |
| |
| // Print global value stubs. |
| bool InStubSection = false; |
| if (TAI->doesSupportExceptionHandling() && MMI && !Subtarget->is64Bit()) { |
| // Add the (possibly multiple) personalities to the set of global values. |
| // Only referenced functions get into the Personalities list. |
| const std::vector<Function *>& Personalities = MMI->getPersonalities(); |
| for (std::vector<Function *>::const_iterator I = Personalities.begin(), |
| E = Personalities.end(); I != E; ++I) { |
| if (!*I) |
| continue; |
| if (!InStubSection) { |
| SwitchToDataSection( |
| "\t.section __IMPORT,__pointers,non_lazy_symbol_pointers"); |
| InStubSection = true; |
| } |
| printGVStub((*I)->getNameStart(), "_"); |
| } |
| } |
| |
| // Output stubs for external and common global variables. |
| if (!InStubSection && !GVStubs.empty()) |
| SwitchToDataSection( |
| "\t.section __IMPORT,__pointers,non_lazy_symbol_pointers"); |
| for (StringSet<>::iterator i = GVStubs.begin(), e = GVStubs.end(); |
| i != e; ++i) |
| printGVStub(i->getKeyData()); |
| |
| if (!HiddenGVStubs.empty()) { |
| SwitchToSection(TAI->getDataSection()); |
| for (StringSet<>::iterator i = HiddenGVStubs.begin(), e = HiddenGVStubs.end(); |
| i != e; ++i) |
| printHiddenGVStub(i->getKeyData()); |
| } |
| |
| // Emit final debug information. |
| DwarfWriter *DW = getAnalysisIfAvailable<DwarfWriter>(); |
| DW->EndModule(); |
| |
| // 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. |
| O << "\t.subsections_via_symbols\n"; |
| } else if (Subtarget->isTargetCygMing()) { |
| // Emit type information for external functions |
| for (StringSet<>::iterator i = FnStubs.begin(), e = FnStubs.end(); |
| i != e; ++i) { |
| O << "\t.def\t " << i->getKeyData() |
| << ";\t.scl\t" << COFF::C_EXT |
| << ";\t.type\t" << (COFF::DT_FCN << COFF::N_BTSHFT) |
| << ";\t.endef\n"; |
| } |
| |
| // Emit final debug information. |
| DwarfWriter *DW = getAnalysisIfAvailable<DwarfWriter>(); |
| DW->EndModule(); |
| } else if (Subtarget->isTargetELF()) { |
| // Emit final debug information. |
| DwarfWriter *DW = getAnalysisIfAvailable<DwarfWriter>(); |
| DW->EndModule(); |
| } |
| |
| return AsmPrinter::doFinalization(M); |
| } |
| |
| // Include the auto-generated portion of the assembly writer. |
| #include "X86GenAsmWriter.inc" |