1 //===-- X86ATTAsmPrinter.cpp - Convert X86 LLVM code to AT&T assembly -----===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains a printer that converts from our internal representation
11 // of machine-dependent LLVM code to AT&T format assembly
12 // language. This printer is the output mechanism used by `llc'.
14 //===----------------------------------------------------------------------===//
16 #define DEBUG_TYPE "asm-printer"
17 #include "X86ATTAsmPrinter.h"
20 #include "X86MachineFunctionInfo.h"
21 #include "X86TargetMachine.h"
22 #include "X86TargetAsmInfo.h"
23 #include "llvm/CallingConv.h"
24 #include "llvm/DerivedTypes.h"
25 #include "llvm/Module.h"
26 #include "llvm/Type.h"
27 #include "llvm/ADT/Statistic.h"
28 #include "llvm/ADT/StringExtras.h"
29 #include "llvm/CodeGen/MachineJumpTableInfo.h"
30 #include "llvm/Support/Mangler.h"
31 #include "llvm/Support/raw_ostream.h"
32 #include "llvm/Target/TargetAsmInfo.h"
33 #include "llvm/Target/TargetOptions.h"
36 STATISTIC(EmittedInsts, "Number of machine instrs printed");
38 static std::string getPICLabelString(unsigned FnNum,
39 const TargetAsmInfo *TAI,
40 const X86Subtarget* Subtarget) {
42 if (Subtarget->isTargetDarwin())
43 label = "\"L" + utostr_32(FnNum) + "$pb\"";
44 else if (Subtarget->isTargetELF())
45 label = ".Lllvm$" + utostr_32(FnNum) + "." "$piclabel";
47 assert(0 && "Don't know how to print PIC label!\n");
52 static X86MachineFunctionInfo calculateFunctionInfo(const Function *F,
53 const TargetData *TD) {
54 X86MachineFunctionInfo Info;
57 switch (F->getCallingConv()) {
58 case CallingConv::X86_StdCall:
59 Info.setDecorationStyle(StdCall);
61 case CallingConv::X86_FastCall:
62 Info.setDecorationStyle(FastCall);
69 for (Function::const_arg_iterator AI = F->arg_begin(), AE = F->arg_end();
70 AI != AE; ++AI, ++argNum) {
71 const Type* Ty = AI->getType();
73 // 'Dereference' type in case of byval parameter attribute
74 if (F->paramHasAttr(argNum, ParamAttr::ByVal))
75 Ty = cast<PointerType>(Ty)->getElementType();
77 // Size should be aligned to DWORD boundary
78 Size += ((TD->getABITypeSize(Ty) + 3)/4)*4;
81 // We're not supporting tooooo huge arguments :)
82 Info.setBytesToPopOnReturn((unsigned int)Size);
86 /// PrintUnmangledNameSafely - Print out the printable characters in the name.
87 /// Don't print things like \n or \0.
88 static void PrintUnmangledNameSafely(const Value *V, raw_ostream &OS) {
89 for (const char *Name = V->getNameStart(), *E = Name+V->getNameLen();
95 /// decorateName - Query FunctionInfoMap and use this information for various
97 void X86ATTAsmPrinter::decorateName(std::string &Name,
98 const GlobalValue *GV) {
99 const Function *F = dyn_cast<Function>(GV);
102 // We don't want to decorate non-stdcall or non-fastcall functions right now
103 unsigned CC = F->getCallingConv();
104 if (CC != CallingConv::X86_StdCall && CC != CallingConv::X86_FastCall)
107 // Decorate names only when we're targeting Cygwin/Mingw32 targets
108 if (!Subtarget->isTargetCygMing())
111 FMFInfoMap::const_iterator info_item = FunctionInfoMap.find(F);
113 const X86MachineFunctionInfo *Info;
114 if (info_item == FunctionInfoMap.end()) {
115 // Calculate apropriate function info and populate map
116 FunctionInfoMap[F] = calculateFunctionInfo(F, TM.getTargetData());
117 Info = &FunctionInfoMap[F];
119 Info = &info_item->second;
122 const FunctionType *FT = F->getFunctionType();
123 switch (Info->getDecorationStyle()) {
127 // "Pure" variadic functions do not receive @0 suffix.
128 if (!FT->isVarArg() || (FT->getNumParams() == 0) ||
129 (FT->getNumParams() == 1 && F->hasStructRetAttr()))
130 Name += '@' + utostr_32(Info->getBytesToPopOnReturn());
133 // "Pure" variadic functions do not receive @0 suffix.
134 if (!FT->isVarArg() || (FT->getNumParams() == 0) ||
135 (FT->getNumParams() == 1 && F->hasStructRetAttr()))
136 Name += '@' + utostr_32(Info->getBytesToPopOnReturn());
138 if (Name[0] == '_') {
145 assert(0 && "Unsupported DecorationStyle");
149 void X86ATTAsmPrinter::emitFunctionHeader(const MachineFunction &MF) {
150 const Function *F = MF.getFunction();
151 std::string SectionName = TAI->SectionForGlobal(F);
153 decorateName(CurrentFnName, F);
155 SwitchToTextSection(SectionName.c_str());
157 unsigned FnAlign = OptimizeForSize ? 1 : 4;
158 if (!F->isDeclaration() && F->hasNote(FnAttr::OptimizeForSize))
160 switch (F->getLinkage()) {
161 default: assert(0 && "Unknown linkage type!");
162 case Function::InternalLinkage: // Symbols default to internal.
163 EmitAlignment(FnAlign, F);
165 case Function::DLLExportLinkage:
166 case Function::ExternalLinkage:
167 EmitAlignment(FnAlign, F);
168 O << "\t.globl\t" << CurrentFnName << '\n';
170 case Function::LinkOnceLinkage:
171 case Function::WeakLinkage:
172 EmitAlignment(FnAlign, F);
173 if (Subtarget->isTargetDarwin()) {
174 O << "\t.globl\t" << CurrentFnName << '\n';
175 O << TAI->getWeakDefDirective() << CurrentFnName << '\n';
176 } else if (Subtarget->isTargetCygMing()) {
177 O << "\t.globl\t" << CurrentFnName << "\n"
178 "\t.linkonce discard\n";
180 O << "\t.weak\t" << CurrentFnName << '\n';
185 printVisibility(CurrentFnName, F->getVisibility());
187 if (Subtarget->isTargetELF())
188 O << "\t.type\t" << CurrentFnName << ",@function\n";
189 else if (Subtarget->isTargetCygMing()) {
190 O << "\t.def\t " << CurrentFnName
192 (F->getLinkage() == Function::InternalLinkage ? COFF::C_STAT : COFF::C_EXT)
193 << ";\t.type\t" << (COFF::DT_FCN << COFF::N_BTSHFT)
197 O << CurrentFnName << ":\n";
198 // Add some workaround for linkonce linkage on Cygwin\MinGW
199 if (Subtarget->isTargetCygMing() &&
200 (F->getLinkage() == Function::LinkOnceLinkage ||
201 F->getLinkage() == Function::WeakLinkage))
202 O << "Lllvm$workaround$fake$stub$" << CurrentFnName << ":\n";
205 /// runOnMachineFunction - This uses the printMachineInstruction()
206 /// method to print assembly for each instruction.
208 bool X86ATTAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
209 const Function *F = MF.getFunction();
210 unsigned CC = F->getCallingConv();
212 SetupMachineFunction(MF);
215 // Populate function information map. Actually, We don't want to populate
216 // non-stdcall or non-fastcall functions' information right now.
217 if (CC == CallingConv::X86_StdCall || CC == CallingConv::X86_FastCall)
218 FunctionInfoMap[F] = *MF.getInfo<X86MachineFunctionInfo>();
220 // Print out constants referenced by the function
221 EmitConstantPool(MF.getConstantPool());
223 if (F->hasDLLExportLinkage())
224 DLLExportedFns.insert(Mang->makeNameProper(F->getName(), ""));
226 // Print the 'header' of function
227 emitFunctionHeader(MF);
229 // Emit pre-function debug and/or EH information.
230 if (TAI->doesSupportDebugInformation() || TAI->doesSupportExceptionHandling())
231 DW.BeginFunction(&MF);
233 // Print out code for the function.
234 bool hasAnyRealCode = false;
235 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
237 // Print a label for the basic block.
238 if (!I->pred_empty()) {
239 printBasicBlockLabel(I, true, true);
242 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
244 // Print the assembly for the instruction.
246 hasAnyRealCode = true;
247 printMachineInstruction(II);
251 if (Subtarget->isTargetDarwin() && !hasAnyRealCode) {
252 // If the function is empty, then we need to emit *something*. Otherwise,
253 // the function's label might be associated with something that it wasn't
254 // meant to be associated with. We emit a noop in this situation.
255 // We are assuming inline asms are code.
259 if (TAI->hasDotTypeDotSizeDirective())
260 O << "\t.size\t" << CurrentFnName << ", .-" << CurrentFnName << '\n';
262 // Emit post-function debug information.
263 if (TAI->doesSupportDebugInformation())
266 // Print out jump tables referenced by the function.
267 EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
269 // We didn't modify anything.
273 static inline bool shouldPrintGOT(TargetMachine &TM, const X86Subtarget* ST) {
274 return ST->isPICStyleGOT() && TM.getRelocationModel() == Reloc::PIC_;
277 static inline bool shouldPrintPLT(TargetMachine &TM, const X86Subtarget* ST) {
278 return ST->isTargetELF() && TM.getRelocationModel() == Reloc::PIC_ &&
279 (ST->isPICStyleRIPRel() || ST->isPICStyleGOT());
282 static inline bool shouldPrintStub(TargetMachine &TM, const X86Subtarget* ST) {
283 return ST->isPICStyleStub() && TM.getRelocationModel() != Reloc::Static;
286 void X86ATTAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
287 const char *Modifier, bool NotRIPRel) {
288 const MachineOperand &MO = MI->getOperand(OpNo);
289 switch (MO.getType()) {
290 case MachineOperand::MO_Register: {
291 assert(TargetRegisterInfo::isPhysicalRegister(MO.getReg()) &&
292 "Virtual registers should not make it this far!");
294 unsigned Reg = MO.getReg();
295 if (Modifier && strncmp(Modifier, "subreg", strlen("subreg")) == 0) {
296 MVT VT = (strcmp(Modifier+6,"64") == 0) ?
297 MVT::i64 : ((strcmp(Modifier+6, "32") == 0) ? MVT::i32 :
298 ((strcmp(Modifier+6,"16") == 0) ? MVT::i16 : MVT::i8));
299 Reg = getX86SubSuperRegister(Reg, VT);
301 O << TRI->getAsmName(Reg);
305 case MachineOperand::MO_Immediate:
307 (strcmp(Modifier, "debug") && strcmp(Modifier, "mem")))
311 case MachineOperand::MO_MachineBasicBlock:
312 printBasicBlockLabel(MO.getMBB());
314 case MachineOperand::MO_JumpTableIndex: {
315 bool isMemOp = Modifier && !strcmp(Modifier, "mem");
316 if (!isMemOp) O << '$';
317 O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() << '_'
320 if (TM.getRelocationModel() == Reloc::PIC_) {
321 if (Subtarget->isPICStyleStub())
322 O << "-\"" << TAI->getPrivateGlobalPrefix() << getFunctionNumber()
324 else if (Subtarget->isPICStyleGOT())
328 if (isMemOp && Subtarget->isPICStyleRIPRel() && !NotRIPRel)
332 case MachineOperand::MO_ConstantPoolIndex: {
333 bool isMemOp = Modifier && !strcmp(Modifier, "mem");
334 if (!isMemOp) O << '$';
335 O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
338 if (TM.getRelocationModel() == Reloc::PIC_) {
339 if (Subtarget->isPICStyleStub())
340 O << "-\"" << TAI->getPrivateGlobalPrefix() << getFunctionNumber()
342 else if (Subtarget->isPICStyleGOT())
346 int Offset = MO.getOffset();
352 if (isMemOp && Subtarget->isPICStyleRIPRel() && !NotRIPRel)
356 case MachineOperand::MO_GlobalAddress: {
357 bool isCallOp = Modifier && !strcmp(Modifier, "call");
358 bool isMemOp = Modifier && !strcmp(Modifier, "mem");
359 bool needCloseParen = false;
361 const GlobalValue *GV = MO.getGlobal();
362 const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV);
364 // If GV is an alias then use the aliasee for determining
366 if (const GlobalAlias *GA = dyn_cast<GlobalAlias>(GV))
367 GVar = dyn_cast_or_null<GlobalVariable>(GA->resolveAliasedGlobal(false));
370 bool isThreadLocal = GVar && GVar->isThreadLocal();
372 std::string Name = Mang->getValueName(GV);
373 decorateName(Name, GV);
375 if (!isMemOp && !isCallOp)
377 else if (Name[0] == '$') {
378 // The name begins with a dollar-sign. In order to avoid having it look
379 // like an integer immediate to the assembler, enclose it in parens.
381 needCloseParen = true;
384 if (shouldPrintStub(TM, Subtarget)) {
385 // Link-once, declaration, or Weakly-linked global variables need
386 // non-lazily-resolved stubs
387 if (GV->isDeclaration() || GV->isWeakForLinker()) {
388 // Dynamically-resolved functions need a stub for the function.
389 if (isCallOp && isa<Function>(GV)) {
390 // Function stubs are no longer needed for Mac OS X 10.5 and up.
391 if (Subtarget->isTargetDarwin() && Subtarget->getDarwinVers() >= 9) {
394 FnStubs.insert(Name);
395 printSuffixedName(Name, "$stub");
398 GVStubs.insert(Name);
399 printSuffixedName(Name, "$non_lazy_ptr");
402 if (GV->hasDLLImportLinkage())
407 if (!isCallOp && TM.getRelocationModel() == Reloc::PIC_)
408 O << '-' << getPICLabelString(getFunctionNumber(), TAI, Subtarget);
410 if (GV->hasDLLImportLinkage()) {
416 if (shouldPrintPLT(TM, Subtarget)) {
417 // Assemble call via PLT for externally visible symbols
418 if (!GV->hasHiddenVisibility() && !GV->hasProtectedVisibility() &&
419 !GV->hasInternalLinkage())
422 if (Subtarget->isTargetCygMing() && GV->isDeclaration())
423 // Save function name for later type emission
424 FnStubs.insert(Name);
428 if (GV->hasExternalWeakLinkage())
429 ExtWeakSymbols.insert(GV);
431 int Offset = MO.getOffset();
438 if (TM.getRelocationModel() == Reloc::PIC_ || Subtarget->is64Bit())
439 O << "@TLSGD"; // general dynamic TLS model
441 if (GV->isDeclaration())
442 O << "@INDNTPOFF"; // initial exec TLS model
444 O << "@NTPOFF"; // local exec TLS model
445 } else if (isMemOp) {
446 if (shouldPrintGOT(TM, Subtarget)) {
447 if (Subtarget->GVRequiresExtraLoad(GV, TM, false))
451 } else if (Subtarget->isPICStyleRIPRel() && !NotRIPRel &&
452 TM.getRelocationModel() != Reloc::Static) {
453 if (Subtarget->GVRequiresExtraLoad(GV, TM, false))
456 if (needCloseParen) {
457 needCloseParen = false;
461 // Use rip when possible to reduce code size, except when
462 // index or base register are also part of the address. e.g.
463 // foo(%rip)(%rcx,%rax,4) is not legal
473 case MachineOperand::MO_ExternalSymbol: {
474 bool isCallOp = Modifier && !strcmp(Modifier, "call");
475 bool needCloseParen = false;
476 std::string Name(TAI->getGlobalPrefix());
477 Name += MO.getSymbolName();
478 // Print function stub suffix unless it's Mac OS X 10.5 and up.
479 if (isCallOp && shouldPrintStub(TM, Subtarget) &&
480 !(Subtarget->isTargetDarwin() && Subtarget->getDarwinVers() >= 9)) {
481 FnStubs.insert(Name);
482 printSuffixedName(Name, "$stub");
487 else if (Name[0] == '$') {
488 // The name begins with a dollar-sign. In order to avoid having it look
489 // like an integer immediate to the assembler, enclose it in parens.
491 needCloseParen = true;
496 if (shouldPrintPLT(TM, Subtarget)) {
497 std::string GOTName(TAI->getGlobalPrefix());
498 GOTName+="_GLOBAL_OFFSET_TABLE_";
500 // HACK! Emit extra offset to PC during printing GOT offset to
501 // compensate for the size of popl instruction. The resulting code
505 // popl %some_register
506 // addl $_GLOBAL_ADDRESS_TABLE_ + [.-piclabel], %some_register
508 << getPICLabelString(getFunctionNumber(), TAI, Subtarget) << ']';
517 if (!isCallOp && Subtarget->isPICStyleRIPRel())
523 O << "<unknown operand type>"; return;
527 void X86ATTAsmPrinter::printSSECC(const MachineInstr *MI, unsigned Op) {
528 unsigned char value = MI->getOperand(Op).getImm();
529 assert(value <= 7 && "Invalid ssecc argument!");
531 case 0: O << "eq"; break;
532 case 1: O << "lt"; break;
533 case 2: O << "le"; break;
534 case 3: O << "unord"; break;
535 case 4: O << "neq"; break;
536 case 5: O << "nlt"; break;
537 case 6: O << "nle"; break;
538 case 7: O << "ord"; break;
542 void X86ATTAsmPrinter::printMemReference(const MachineInstr *MI, unsigned Op,
543 const char *Modifier){
544 assert(isMem(MI, Op) && "Invalid memory reference!");
545 MachineOperand BaseReg = MI->getOperand(Op);
546 MachineOperand IndexReg = MI->getOperand(Op+2);
547 const MachineOperand &DispSpec = MI->getOperand(Op+3);
549 bool NotRIPRel = IndexReg.getReg() || BaseReg.getReg();
550 if (DispSpec.isGlobalAddress() ||
551 DispSpec.isConstantPoolIndex() ||
552 DispSpec.isJumpTableIndex()) {
553 printOperand(MI, Op+3, "mem", NotRIPRel);
555 int DispVal = DispSpec.getImm();
556 if (DispVal || (!IndexReg.getReg() && !BaseReg.getReg()))
560 if (IndexReg.getReg() || BaseReg.getReg()) {
561 unsigned ScaleVal = MI->getOperand(Op+1).getImm();
562 unsigned BaseRegOperand = 0, IndexRegOperand = 2;
564 // There are cases where we can end up with ESP/RSP in the indexreg slot.
565 // If this happens, swap the base/index register to support assemblers that
566 // don't work when the index is *SP.
567 if (IndexReg.getReg() == X86::ESP || IndexReg.getReg() == X86::RSP) {
568 assert(ScaleVal == 1 && "Scale not supported for stack pointer!");
569 std::swap(BaseReg, IndexReg);
570 std::swap(BaseRegOperand, IndexRegOperand);
574 if (BaseReg.getReg())
575 printOperand(MI, Op+BaseRegOperand, Modifier);
577 if (IndexReg.getReg()) {
579 printOperand(MI, Op+IndexRegOperand, Modifier);
581 O << ',' << ScaleVal;
587 void X86ATTAsmPrinter::printPICJumpTableSetLabel(unsigned uid,
588 const MachineBasicBlock *MBB) const {
589 if (!TAI->getSetDirective())
592 // We don't need .set machinery if we have GOT-style relocations
593 if (Subtarget->isPICStyleGOT())
596 O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix()
597 << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ',';
598 printBasicBlockLabel(MBB, false, false, false);
599 if (Subtarget->isPICStyleRIPRel())
600 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
601 << '_' << uid << '\n';
603 O << '-' << getPICLabelString(getFunctionNumber(), TAI, Subtarget) << '\n';
606 void X86ATTAsmPrinter::printPICLabel(const MachineInstr *MI, unsigned Op) {
607 std::string label = getPICLabelString(getFunctionNumber(), TAI, Subtarget);
608 O << label << '\n' << label << ':';
612 void X86ATTAsmPrinter::printPICJumpTableEntry(const MachineJumpTableInfo *MJTI,
613 const MachineBasicBlock *MBB,
616 const char *JTEntryDirective = MJTI->getEntrySize() == 4 ?
617 TAI->getData32bitsDirective() : TAI->getData64bitsDirective();
619 O << JTEntryDirective << ' ';
621 if (TM.getRelocationModel() == Reloc::PIC_) {
622 if (Subtarget->isPICStyleRIPRel() || Subtarget->isPICStyleStub()) {
623 O << TAI->getPrivateGlobalPrefix() << getFunctionNumber()
624 << '_' << uid << "_set_" << MBB->getNumber();
625 } else if (Subtarget->isPICStyleGOT()) {
626 printBasicBlockLabel(MBB, false, false, false);
629 assert(0 && "Don't know how to print MBB label for this PIC mode");
631 printBasicBlockLabel(MBB, false, false, false);
634 bool X86ATTAsmPrinter::printAsmMRegister(const MachineOperand &MO,
636 unsigned Reg = MO.getReg();
638 default: return true; // Unknown mode.
639 case 'b': // Print QImode register
640 Reg = getX86SubSuperRegister(Reg, MVT::i8);
642 case 'h': // Print QImode high register
643 Reg = getX86SubSuperRegister(Reg, MVT::i8, true);
645 case 'w': // Print HImode register
646 Reg = getX86SubSuperRegister(Reg, MVT::i16);
648 case 'k': // Print SImode register
649 Reg = getX86SubSuperRegister(Reg, MVT::i32);
651 case 'q': // Print DImode register
652 Reg = getX86SubSuperRegister(Reg, MVT::i64);
656 O << '%'<< TRI->getAsmName(Reg);
660 /// PrintAsmOperand - Print out an operand for an inline asm expression.
662 bool X86ATTAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
664 const char *ExtraCode) {
665 // Does this asm operand have a single letter operand modifier?
666 if (ExtraCode && ExtraCode[0]) {
667 if (ExtraCode[1] != 0) return true; // Unknown modifier.
669 switch (ExtraCode[0]) {
670 default: return true; // Unknown modifier.
671 case 'c': // Don't print "$" before a global var name or constant.
672 printOperand(MI, OpNo, "mem");
674 case 'b': // Print QImode register
675 case 'h': // Print QImode high register
676 case 'w': // Print HImode register
677 case 'k': // Print SImode register
678 case 'q': // Print DImode register
679 if (MI->getOperand(OpNo).isRegister())
680 return printAsmMRegister(MI->getOperand(OpNo), ExtraCode[0]);
681 printOperand(MI, OpNo);
684 case 'P': // Don't print @PLT, but do print as memory.
685 printOperand(MI, OpNo, "mem");
690 printOperand(MI, OpNo);
694 bool X86ATTAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
697 const char *ExtraCode) {
698 if (ExtraCode && ExtraCode[0]) {
699 if (ExtraCode[1] != 0) return true; // Unknown modifier.
701 switch (ExtraCode[0]) {
702 default: return true; // Unknown modifier.
703 case 'b': // Print QImode register
704 case 'h': // Print QImode high register
705 case 'w': // Print HImode register
706 case 'k': // Print SImode register
707 case 'q': // Print SImode register
708 // These only apply to registers, ignore on mem.
712 printMemReference(MI, OpNo);
716 /// printMachineInstruction -- Print out a single X86 LLVM instruction
717 /// MI in AT&T syntax to the current output stream.
719 void X86ATTAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
722 // Call the autogenerated instruction printer routines.
723 printInstruction(MI);
727 bool X86ATTAsmPrinter::doInitialization(Module &M) {
728 if (TAI->doesSupportDebugInformation()) {
729 // Emit initial debug information.
733 bool Result = AsmPrinter::doInitialization(M);
735 if (TAI->doesSupportDebugInformation()) {
736 // Let PassManager know we need debug information and relay
737 // the MachineModuleInfo address on to DwarfWriter.
738 // AsmPrinter::doInitialization did this analysis.
739 MMI = getAnalysisToUpdate<MachineModuleInfo>();
740 DW.SetModuleInfo(MMI);
743 // Darwin wants symbols to be quoted if they have complex names.
744 if (Subtarget->isTargetDarwin())
745 Mang->setUseQuotes(true);
751 void X86ATTAsmPrinter::printModuleLevelGV(const GlobalVariable* GVar) {
752 const TargetData *TD = TM.getTargetData();
754 if (!GVar->hasInitializer())
755 return; // External global require no code
757 // Check to see if this is a special global used by LLVM, if so, emit it.
758 if (EmitSpecialLLVMGlobal(GVar)) {
759 if (Subtarget->isTargetDarwin() &&
760 TM.getRelocationModel() == Reloc::Static) {
761 if (GVar->getName() == "llvm.global_ctors")
762 O << ".reference .constructors_used\n";
763 else if (GVar->getName() == "llvm.global_dtors")
764 O << ".reference .destructors_used\n";
769 std::string SectionName = TAI->SectionForGlobal(GVar);
770 std::string name = Mang->getValueName(GVar);
771 Constant *C = GVar->getInitializer();
772 const Type *Type = C->getType();
773 unsigned Size = TD->getABITypeSize(Type);
774 unsigned Align = TD->getPreferredAlignmentLog(GVar);
776 printVisibility(name, GVar->getVisibility());
778 if (Subtarget->isTargetELF())
779 O << "\t.type\t" << name << ",@object\n";
781 SwitchToDataSection(SectionName.c_str());
783 if (C->isNullValue() && !GVar->hasSection()) {
784 // FIXME: This seems to be pretty darwin-specific
785 if (GVar->hasExternalLinkage()) {
786 if (const char *Directive = TAI->getZeroFillDirective()) {
787 O << "\t.globl " << name << '\n';
788 O << Directive << "__DATA, __common, " << name << ", "
789 << Size << ", " << Align << '\n';
794 if (!GVar->isThreadLocal() &&
795 (GVar->hasInternalLinkage() || GVar->isWeakForLinker())) {
796 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
798 if (TAI->getLCOMMDirective() != NULL) {
799 if (GVar->hasInternalLinkage()) {
800 O << TAI->getLCOMMDirective() << name << ',' << Size;
801 if (Subtarget->isTargetDarwin())
803 } else if (Subtarget->isTargetDarwin() && !GVar->hasCommonLinkage()) {
804 O << "\t.globl " << name << '\n'
805 << TAI->getWeakDefDirective() << name << '\n';
806 EmitAlignment(Align, GVar);
807 O << name << ":\t\t\t\t" << TAI->getCommentString() << ' ';
808 PrintUnmangledNameSafely(GVar, O);
810 EmitGlobalConstant(C);
813 O << TAI->getCOMMDirective() << name << ',' << Size;
814 if (TAI->getCOMMDirectiveTakesAlignment())
815 O << ',' << (TAI->getAlignmentIsInBytes() ? (1 << Align) : Align);
818 if (!Subtarget->isTargetCygMing()) {
819 if (GVar->hasInternalLinkage())
820 O << "\t.local\t" << name << '\n';
822 O << TAI->getCOMMDirective() << name << ',' << Size;
823 if (TAI->getCOMMDirectiveTakesAlignment())
824 O << ',' << (TAI->getAlignmentIsInBytes() ? (1 << Align) : Align);
826 O << "\t\t" << TAI->getCommentString() << ' ';
827 PrintUnmangledNameSafely(GVar, O);
833 switch (GVar->getLinkage()) {
834 case GlobalValue::CommonLinkage:
835 case GlobalValue::LinkOnceLinkage:
836 case GlobalValue::WeakLinkage:
837 if (Subtarget->isTargetDarwin()) {
838 O << "\t.globl " << name << '\n'
839 << TAI->getWeakDefDirective() << name << '\n';
840 } else if (Subtarget->isTargetCygMing()) {
841 O << "\t.globl\t" << name << "\n"
842 "\t.linkonce same_size\n";
844 O << "\t.weak\t" << name << '\n';
847 case GlobalValue::DLLExportLinkage:
848 case GlobalValue::AppendingLinkage:
849 // FIXME: appending linkage variables should go into a section of
850 // their name or something. For now, just emit them as external.
851 case GlobalValue::ExternalLinkage:
852 // If external or appending, declare as a global symbol
853 O << "\t.globl " << name << '\n';
855 case GlobalValue::InternalLinkage:
858 assert(0 && "Unknown linkage type!");
861 EmitAlignment(Align, GVar);
862 O << name << ":\t\t\t\t" << TAI->getCommentString() << ' ';
863 PrintUnmangledNameSafely(GVar, O);
865 if (TAI->hasDotTypeDotSizeDirective())
866 O << "\t.size\t" << name << ", " << Size << '\n';
868 // If the initializer is a extern weak symbol, remember to emit the weak
870 if (const GlobalValue *GV = dyn_cast<GlobalValue>(C))
871 if (GV->hasExternalWeakLinkage())
872 ExtWeakSymbols.insert(GV);
874 EmitGlobalConstant(C);
877 /// printGVStub - Print stub for a global value.
879 void X86ATTAsmPrinter::printGVStub(const char *GV, const char *Prefix) {
880 printSuffixedName(GV, "$non_lazy_ptr", Prefix);
881 O << ":\n\t.indirect_symbol ";
882 if (Prefix) O << Prefix;
883 O << GV << "\n\t.long\t0\n";
887 bool X86ATTAsmPrinter::doFinalization(Module &M) {
888 // Print out module-level global variables here.
889 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
891 printModuleLevelGV(I);
893 if (I->hasDLLExportLinkage())
894 DLLExportedGVs.insert(Mang->makeNameProper(I->getName(),""));
897 // Output linker support code for dllexported globals
898 if (!DLLExportedGVs.empty())
899 SwitchToDataSection(".section .drectve");
901 for (StringSet<>::iterator i = DLLExportedGVs.begin(),
902 e = DLLExportedGVs.end();
904 O << "\t.ascii \" -export:" << i->getKeyData() << ",data\"\n";
906 if (!DLLExportedFns.empty()) {
907 SwitchToDataSection(".section .drectve");
910 for (StringSet<>::iterator i = DLLExportedFns.begin(),
911 e = DLLExportedFns.end();
913 O << "\t.ascii \" -export:" << i->getKeyData() << "\"\n";
915 if (Subtarget->isTargetDarwin()) {
916 SwitchToDataSection("");
918 // Output stubs for dynamically-linked functions
920 for (StringSet<>::iterator i = FnStubs.begin(), e = FnStubs.end();
922 SwitchToDataSection("\t.section __IMPORT,__jump_table,symbol_stubs,"
923 "self_modifying_code+pure_instructions,5", 0);
924 const char *p = i->getKeyData();
925 printSuffixedName(p, "$stub");
927 "\t.indirect_symbol " << p << "\n"
928 "\thlt ; hlt ; hlt ; hlt ; hlt\n";
933 // Print global value stubs.
934 bool InStubSection = false;
935 if (TAI->doesSupportExceptionHandling() && MMI && !Subtarget->is64Bit()) {
936 // Add the (possibly multiple) personalities to the set of global values.
937 // Only referenced functions get into the Personalities list.
938 const std::vector<Function *>& Personalities = MMI->getPersonalities();
939 for (std::vector<Function *>::const_iterator I = Personalities.begin(),
940 E = Personalities.end(); I != E; ++I) {
943 if (!InStubSection) {
945 "\t.section __IMPORT,__pointers,non_lazy_symbol_pointers");
946 InStubSection = true;
948 printGVStub((*I)->getNameStart(), "_");
952 // Output stubs for external and common global variables.
953 if (!InStubSection && !GVStubs.empty())
955 "\t.section __IMPORT,__pointers,non_lazy_symbol_pointers");
956 for (StringSet<>::iterator i = GVStubs.begin(), e = GVStubs.end();
958 printGVStub(i->getKeyData());
960 // Emit final debug information.
963 // Funny Darwin hack: This flag tells the linker that no global symbols
964 // contain code that falls through to other global symbols (e.g. the obvious
965 // implementation of multiple entry points). If this doesn't occur, the
966 // linker can safely perform dead code stripping. Since LLVM never
967 // generates code that does this, it is always safe to set.
968 O << "\t.subsections_via_symbols\n";
969 } else if (Subtarget->isTargetCygMing()) {
970 // Emit type information for external functions
971 for (StringSet<>::iterator i = FnStubs.begin(), e = FnStubs.end();
973 O << "\t.def\t " << i->getKeyData()
974 << ";\t.scl\t" << COFF::C_EXT
975 << ";\t.type\t" << (COFF::DT_FCN << COFF::N_BTSHFT)
979 // Emit final debug information.
981 } else if (Subtarget->isTargetELF()) {
982 // Emit final debug information.
986 return AsmPrinter::doFinalization(M);
989 // Include the auto-generated portion of the assembly writer.
990 #include "X86GenAsmWriter.inc"