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, Attribute::ByVal))
75 Ty = cast<PointerType>(Ty)->getElementType();
77 // Size should be aligned to DWORD boundary
78 Size += ((TD->getTypePaddedSize(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();
152 decorateName(CurrentFnName, F);
154 SwitchToSection(TAI->SectionForGlobal(F));
156 unsigned FnAlign = 4;
157 if (F->hasFnAttr(Attribute::OptimizeForSize))
159 switch (F->getLinkage()) {
160 default: assert(0 && "Unknown linkage type!");
161 case Function::InternalLinkage: // Symbols default to internal.
162 case Function::PrivateLinkage:
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->hasInternalLinkage() ? 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())
264 DW->EndFunction(&MF);
266 // Print out jump tables referenced by the function.
267 EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
271 // We didn't modify anything.
275 static inline bool shouldPrintGOT(TargetMachine &TM, const X86Subtarget* ST) {
276 return ST->isPICStyleGOT() && TM.getRelocationModel() == Reloc::PIC_;
279 static inline bool shouldPrintPLT(TargetMachine &TM, const X86Subtarget* ST) {
280 return ST->isTargetELF() && TM.getRelocationModel() == Reloc::PIC_ &&
281 (ST->isPICStyleRIPRel() || ST->isPICStyleGOT());
284 static inline bool shouldPrintStub(TargetMachine &TM, const X86Subtarget* ST) {
285 return ST->isPICStyleStub() && TM.getRelocationModel() != Reloc::Static;
288 void X86ATTAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
289 const char *Modifier, bool NotRIPRel) {
290 const MachineOperand &MO = MI->getOperand(OpNo);
291 switch (MO.getType()) {
292 case MachineOperand::MO_Register: {
293 assert(TargetRegisterInfo::isPhysicalRegister(MO.getReg()) &&
294 "Virtual registers should not make it this far!");
296 unsigned Reg = MO.getReg();
297 if (Modifier && strncmp(Modifier, "subreg", strlen("subreg")) == 0) {
298 MVT VT = (strcmp(Modifier+6,"64") == 0) ?
299 MVT::i64 : ((strcmp(Modifier+6, "32") == 0) ? MVT::i32 :
300 ((strcmp(Modifier+6,"16") == 0) ? MVT::i16 : MVT::i8));
301 Reg = getX86SubSuperRegister(Reg, VT);
303 O << TRI->getAsmName(Reg);
307 case MachineOperand::MO_Immediate:
309 (strcmp(Modifier, "debug") && strcmp(Modifier, "mem")))
313 case MachineOperand::MO_MachineBasicBlock:
314 printBasicBlockLabel(MO.getMBB());
316 case MachineOperand::MO_JumpTableIndex: {
317 bool isMemOp = Modifier && !strcmp(Modifier, "mem");
318 if (!isMemOp) O << '$';
319 O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() << '_'
322 if (TM.getRelocationModel() == Reloc::PIC_) {
323 if (Subtarget->isPICStyleStub())
324 O << "-\"" << TAI->getPrivateGlobalPrefix() << getFunctionNumber()
326 else if (Subtarget->isPICStyleGOT())
330 if (isMemOp && Subtarget->isPICStyleRIPRel() && !NotRIPRel)
334 case MachineOperand::MO_ConstantPoolIndex: {
335 bool isMemOp = Modifier && !strcmp(Modifier, "mem");
336 if (!isMemOp) O << '$';
337 O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
340 if (TM.getRelocationModel() == Reloc::PIC_) {
341 if (Subtarget->isPICStyleStub())
342 O << "-\"" << TAI->getPrivateGlobalPrefix() << getFunctionNumber()
344 else if (Subtarget->isPICStyleGOT())
348 printOffset(MO.getOffset());
350 if (isMemOp && Subtarget->isPICStyleRIPRel() && !NotRIPRel)
354 case MachineOperand::MO_GlobalAddress: {
355 bool isCallOp = Modifier && !strcmp(Modifier, "call");
356 bool isMemOp = Modifier && !strcmp(Modifier, "mem");
357 bool needCloseParen = false;
359 const GlobalValue *GV = MO.getGlobal();
360 const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV);
362 // If GV is an alias then use the aliasee for determining
364 if (const GlobalAlias *GA = dyn_cast<GlobalAlias>(GV))
365 GVar = dyn_cast_or_null<GlobalVariable>(GA->resolveAliasedGlobal(false));
368 bool isThreadLocal = GVar && GVar->isThreadLocal();
370 std::string Name = Mang->getValueName(GV);
371 decorateName(Name, GV);
373 if (!isMemOp && !isCallOp)
375 else if (Name[0] == '$') {
376 // The name begins with a dollar-sign. In order to avoid having it look
377 // like an integer immediate to the assembler, enclose it in parens.
379 needCloseParen = true;
382 if (shouldPrintStub(TM, Subtarget)) {
383 // Link-once, declaration, or Weakly-linked global variables need
384 // non-lazily-resolved stubs
385 if (GV->isDeclaration() || GV->mayBeOverridden()) {
386 // Dynamically-resolved functions need a stub for the function.
387 if (isCallOp && isa<Function>(GV)) {
388 // Function stubs are no longer needed for Mac OS X 10.5 and up.
389 if (Subtarget->isTargetDarwin() && Subtarget->getDarwinVers() >= 9) {
392 FnStubs.insert(Name);
393 printSuffixedName(Name, "$stub");
395 } else if (GV->hasHiddenVisibility()) {
396 if (!GV->isDeclaration() && !GV->hasCommonLinkage())
397 // Definition is not definitely in the current translation unit.
400 HiddenGVStubs.insert(Name);
401 printSuffixedName(Name, "$non_lazy_ptr");
404 GVStubs.insert(Name);
405 printSuffixedName(Name, "$non_lazy_ptr");
408 if (GV->hasDLLImportLinkage())
413 if (!isCallOp && TM.getRelocationModel() == Reloc::PIC_)
414 O << '-' << getPICLabelString(getFunctionNumber(), TAI, Subtarget);
416 if (GV->hasDLLImportLinkage()) {
422 if (shouldPrintPLT(TM, Subtarget)) {
423 // Assemble call via PLT for externally visible symbols
424 if (!GV->hasHiddenVisibility() && !GV->hasProtectedVisibility() &&
425 !GV->hasLocalLinkage())
428 if (Subtarget->isTargetCygMing() && GV->isDeclaration())
429 // Save function name for later type emission
430 FnStubs.insert(Name);
434 if (GV->hasExternalWeakLinkage())
435 ExtWeakSymbols.insert(GV);
437 printOffset(MO.getOffset());
440 if (TM.getRelocationModel() == Reloc::PIC_ || Subtarget->is64Bit())
441 O << "@TLSGD"; // general dynamic TLS model
443 if (GV->isDeclaration())
444 O << "@INDNTPOFF"; // initial exec TLS model
446 O << "@NTPOFF"; // local exec TLS model
447 } else if (isMemOp) {
448 if (shouldPrintGOT(TM, Subtarget)) {
449 if (Subtarget->GVRequiresExtraLoad(GV, TM, false))
453 } else if (Subtarget->isPICStyleRIPRel() && !NotRIPRel &&
454 TM.getRelocationModel() != Reloc::Static) {
455 if (Subtarget->GVRequiresExtraLoad(GV, TM, false))
458 if (needCloseParen) {
459 needCloseParen = false;
463 // Use rip when possible to reduce code size, except when
464 // index or base register are also part of the address. e.g.
465 // foo(%rip)(%rcx,%rax,4) is not legal
475 case MachineOperand::MO_ExternalSymbol: {
476 bool isCallOp = Modifier && !strcmp(Modifier, "call");
477 bool needCloseParen = false;
478 std::string Name(TAI->getGlobalPrefix());
479 Name += MO.getSymbolName();
480 // Print function stub suffix unless it's Mac OS X 10.5 and up.
481 if (isCallOp && shouldPrintStub(TM, Subtarget) &&
482 !(Subtarget->isTargetDarwin() && Subtarget->getDarwinVers() >= 9)) {
483 FnStubs.insert(Name);
484 printSuffixedName(Name, "$stub");
489 else if (Name[0] == '$') {
490 // The name begins with a dollar-sign. In order to avoid having it look
491 // like an integer immediate to the assembler, enclose it in parens.
493 needCloseParen = true;
498 if (shouldPrintPLT(TM, Subtarget)) {
499 std::string GOTName(TAI->getGlobalPrefix());
500 GOTName+="_GLOBAL_OFFSET_TABLE_";
502 // HACK! Emit extra offset to PC during printing GOT offset to
503 // compensate for the size of popl instruction. The resulting code
507 // popl %some_register
508 // addl $_GLOBAL_ADDRESS_TABLE_ + [.-piclabel], %some_register
510 << getPICLabelString(getFunctionNumber(), TAI, Subtarget) << ']';
519 if (!isCallOp && Subtarget->isPICStyleRIPRel())
525 O << "<unknown operand type>"; return;
529 void X86ATTAsmPrinter::printSSECC(const MachineInstr *MI, unsigned Op) {
530 unsigned char value = MI->getOperand(Op).getImm();
531 assert(value <= 7 && "Invalid ssecc argument!");
533 case 0: O << "eq"; break;
534 case 1: O << "lt"; break;
535 case 2: O << "le"; break;
536 case 3: O << "unord"; break;
537 case 4: O << "neq"; break;
538 case 5: O << "nlt"; break;
539 case 6: O << "nle"; break;
540 case 7: O << "ord"; break;
544 void X86ATTAsmPrinter::printMemReference(const MachineInstr *MI, unsigned Op,
545 const char *Modifier){
546 assert(isMem(MI, Op) && "Invalid memory reference!");
547 MachineOperand BaseReg = MI->getOperand(Op);
548 MachineOperand IndexReg = MI->getOperand(Op+2);
549 const MachineOperand &DispSpec = MI->getOperand(Op+3);
551 bool NotRIPRel = IndexReg.getReg() || BaseReg.getReg();
552 if (DispSpec.isGlobal() ||
555 printOperand(MI, Op+3, "mem", NotRIPRel);
557 int DispVal = DispSpec.getImm();
558 if (DispVal || (!IndexReg.getReg() && !BaseReg.getReg()))
562 if (IndexReg.getReg() || BaseReg.getReg()) {
563 unsigned ScaleVal = MI->getOperand(Op+1).getImm();
564 unsigned BaseRegOperand = 0, IndexRegOperand = 2;
566 // There are cases where we can end up with ESP/RSP in the indexreg slot.
567 // If this happens, swap the base/index register to support assemblers that
568 // don't work when the index is *SP.
569 if (IndexReg.getReg() == X86::ESP || IndexReg.getReg() == X86::RSP) {
570 assert(ScaleVal == 1 && "Scale not supported for stack pointer!");
571 std::swap(BaseReg, IndexReg);
572 std::swap(BaseRegOperand, IndexRegOperand);
576 if (BaseReg.getReg())
577 printOperand(MI, Op+BaseRegOperand, Modifier);
579 if (IndexReg.getReg()) {
581 printOperand(MI, Op+IndexRegOperand, Modifier);
583 O << ',' << ScaleVal;
589 void X86ATTAsmPrinter::printPICJumpTableSetLabel(unsigned uid,
590 const MachineBasicBlock *MBB) const {
591 if (!TAI->getSetDirective())
594 // We don't need .set machinery if we have GOT-style relocations
595 if (Subtarget->isPICStyleGOT())
598 O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix()
599 << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ',';
600 printBasicBlockLabel(MBB, false, false, false);
601 if (Subtarget->isPICStyleRIPRel())
602 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
603 << '_' << uid << '\n';
605 O << '-' << getPICLabelString(getFunctionNumber(), TAI, Subtarget) << '\n';
608 void X86ATTAsmPrinter::printPICLabel(const MachineInstr *MI, unsigned Op) {
609 std::string label = getPICLabelString(getFunctionNumber(), TAI, Subtarget);
610 O << label << '\n' << label << ':';
614 void X86ATTAsmPrinter::printPICJumpTableEntry(const MachineJumpTableInfo *MJTI,
615 const MachineBasicBlock *MBB,
618 const char *JTEntryDirective = MJTI->getEntrySize() == 4 ?
619 TAI->getData32bitsDirective() : TAI->getData64bitsDirective();
621 O << JTEntryDirective << ' ';
623 if (TM.getRelocationModel() == Reloc::PIC_) {
624 if (Subtarget->isPICStyleRIPRel() || Subtarget->isPICStyleStub()) {
625 O << TAI->getPrivateGlobalPrefix() << getFunctionNumber()
626 << '_' << uid << "_set_" << MBB->getNumber();
627 } else if (Subtarget->isPICStyleGOT()) {
628 printBasicBlockLabel(MBB, false, false, false);
631 assert(0 && "Don't know how to print MBB label for this PIC mode");
633 printBasicBlockLabel(MBB, false, false, false);
636 bool X86ATTAsmPrinter::printAsmMRegister(const MachineOperand &MO,
638 unsigned Reg = MO.getReg();
640 default: return true; // Unknown mode.
641 case 'b': // Print QImode register
642 Reg = getX86SubSuperRegister(Reg, MVT::i8);
644 case 'h': // Print QImode high register
645 Reg = getX86SubSuperRegister(Reg, MVT::i8, true);
647 case 'w': // Print HImode register
648 Reg = getX86SubSuperRegister(Reg, MVT::i16);
650 case 'k': // Print SImode register
651 Reg = getX86SubSuperRegister(Reg, MVT::i32);
653 case 'q': // Print DImode register
654 Reg = getX86SubSuperRegister(Reg, MVT::i64);
658 O << '%'<< TRI->getAsmName(Reg);
662 /// PrintAsmOperand - Print out an operand for an inline asm expression.
664 bool X86ATTAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
666 const char *ExtraCode) {
667 // Does this asm operand have a single letter operand modifier?
668 if (ExtraCode && ExtraCode[0]) {
669 if (ExtraCode[1] != 0) return true; // Unknown modifier.
671 switch (ExtraCode[0]) {
672 default: return true; // Unknown modifier.
673 case 'c': // Don't print "$" before a global var name or constant.
674 printOperand(MI, OpNo, "mem");
676 case 'b': // Print QImode register
677 case 'h': // Print QImode high register
678 case 'w': // Print HImode register
679 case 'k': // Print SImode register
680 case 'q': // Print DImode register
681 if (MI->getOperand(OpNo).isReg())
682 return printAsmMRegister(MI->getOperand(OpNo), ExtraCode[0]);
683 printOperand(MI, OpNo);
686 case 'P': // Don't print @PLT, but do print as memory.
687 printOperand(MI, OpNo, "mem");
692 printOperand(MI, OpNo);
696 bool X86ATTAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
699 const char *ExtraCode) {
700 if (ExtraCode && ExtraCode[0]) {
701 if (ExtraCode[1] != 0) return true; // Unknown modifier.
703 switch (ExtraCode[0]) {
704 default: return true; // Unknown modifier.
705 case 'b': // Print QImode register
706 case 'h': // Print QImode high register
707 case 'w': // Print HImode register
708 case 'k': // Print SImode register
709 case 'q': // Print SImode register
710 // These only apply to registers, ignore on mem.
714 printMemReference(MI, OpNo);
718 /// printMachineInstruction -- Print out a single X86 LLVM instruction
719 /// MI in AT&T syntax to the current output stream.
721 void X86ATTAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
724 // Call the autogenerated instruction printer routines.
725 printInstruction(MI);
729 bool X86ATTAsmPrinter::doInitialization(Module &M) {
731 bool Result = AsmPrinter::doInitialization(M);
733 if (TAI->doesSupportDebugInformation()) {
734 // Let PassManager know we need debug information and relay
735 // the MachineModuleInfo address on to DwarfWriter.
736 // AsmPrinter::doInitialization did this analysis.
737 MMI = getAnalysisToUpdate<MachineModuleInfo>();
738 DW = getAnalysisToUpdate<DwarfWriter>();
739 DW->BeginModule(&M, MMI, O, this, TAI);
742 // Darwin wants symbols to be quoted if they have complex names.
743 if (Subtarget->isTargetDarwin())
744 Mang->setUseQuotes(true);
750 void X86ATTAsmPrinter::printModuleLevelGV(const GlobalVariable* GVar) {
751 const TargetData *TD = TM.getTargetData();
753 if (!GVar->hasInitializer())
754 return; // External global require no code
756 // Check to see if this is a special global used by LLVM, if so, emit it.
757 if (EmitSpecialLLVMGlobal(GVar)) {
758 if (Subtarget->isTargetDarwin() &&
759 TM.getRelocationModel() == Reloc::Static) {
760 if (GVar->getName() == "llvm.global_ctors")
761 O << ".reference .constructors_used\n";
762 else if (GVar->getName() == "llvm.global_dtors")
763 O << ".reference .destructors_used\n";
768 std::string name = Mang->getValueName(GVar);
769 Constant *C = GVar->getInitializer();
770 const Type *Type = C->getType();
771 unsigned Size = TD->getTypePaddedSize(Type);
772 unsigned Align = TD->getPreferredAlignmentLog(GVar);
774 printVisibility(name, GVar->getVisibility());
776 if (Subtarget->isTargetELF())
777 O << "\t.type\t" << name << ",@object\n";
779 SwitchToSection(TAI->SectionForGlobal(GVar));
781 if (C->isNullValue() && !GVar->hasSection()) {
782 // FIXME: This seems to be pretty darwin-specific
783 if (GVar->hasExternalLinkage()) {
784 if (const char *Directive = TAI->getZeroFillDirective()) {
785 O << "\t.globl " << name << '\n';
786 O << Directive << "__DATA, __common, " << name << ", "
787 << Size << ", " << Align << '\n';
792 if (!GVar->isThreadLocal() &&
793 (GVar->hasLocalLinkage() || GVar->mayBeOverridden())) {
794 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
796 if (TAI->getLCOMMDirective() != NULL) {
797 if (GVar->hasLocalLinkage()) {
798 O << TAI->getLCOMMDirective() << name << ',' << Size;
799 if (Subtarget->isTargetDarwin())
801 } else if (Subtarget->isTargetDarwin() && !GVar->hasCommonLinkage()) {
802 O << "\t.globl " << name << '\n'
803 << TAI->getWeakDefDirective() << name << '\n';
804 EmitAlignment(Align, GVar);
805 O << name << ":\t\t\t\t" << TAI->getCommentString() << ' ';
806 PrintUnmangledNameSafely(GVar, O);
808 EmitGlobalConstant(C);
811 O << TAI->getCOMMDirective() << name << ',' << Size;
812 if (TAI->getCOMMDirectiveTakesAlignment())
813 O << ',' << (TAI->getAlignmentIsInBytes() ? (1 << Align) : Align);
816 if (!Subtarget->isTargetCygMing()) {
817 if (GVar->hasLocalLinkage())
818 O << "\t.local\t" << name << '\n';
820 O << TAI->getCOMMDirective() << name << ',' << Size;
821 if (TAI->getCOMMDirectiveTakesAlignment())
822 O << ',' << (TAI->getAlignmentIsInBytes() ? (1 << Align) : Align);
824 O << "\t\t" << TAI->getCommentString() << ' ';
825 PrintUnmangledNameSafely(GVar, O);
831 switch (GVar->getLinkage()) {
832 case GlobalValue::CommonLinkage:
833 case GlobalValue::LinkOnceLinkage:
834 case GlobalValue::WeakLinkage:
835 if (Subtarget->isTargetDarwin()) {
836 O << "\t.globl " << name << '\n'
837 << TAI->getWeakDefDirective() << name << '\n';
838 } else if (Subtarget->isTargetCygMing()) {
839 O << "\t.globl\t" << name << "\n"
840 "\t.linkonce same_size\n";
842 O << "\t.weak\t" << name << '\n';
845 case GlobalValue::DLLExportLinkage:
846 case GlobalValue::AppendingLinkage:
847 // FIXME: appending linkage variables should go into a section of
848 // their name or something. For now, just emit them as external.
849 case GlobalValue::ExternalLinkage:
850 // If external or appending, declare as a global symbol
851 O << "\t.globl " << name << '\n';
853 case GlobalValue::PrivateLinkage:
854 case GlobalValue::InternalLinkage:
857 assert(0 && "Unknown linkage type!");
860 EmitAlignment(Align, GVar);
861 O << name << ":\t\t\t\t" << TAI->getCommentString() << ' ';
862 PrintUnmangledNameSafely(GVar, O);
864 if (TAI->hasDotTypeDotSizeDirective())
865 O << "\t.size\t" << name << ", " << Size << '\n';
867 // If the initializer is a extern weak symbol, remember to emit the weak
869 if (const GlobalValue *GV = dyn_cast<GlobalValue>(C))
870 if (GV->hasExternalWeakLinkage())
871 ExtWeakSymbols.insert(GV);
873 EmitGlobalConstant(C);
876 /// printGVStub - Print stub for a global value.
878 void X86ATTAsmPrinter::printGVStub(const char *GV, const char *Prefix) {
879 printSuffixedName(GV, "$non_lazy_ptr", Prefix);
880 O << ":\n\t.indirect_symbol ";
881 if (Prefix) O << Prefix;
882 O << GV << "\n\t.long\t0\n";
885 /// printHiddenGVStub - Print stub for a hidden global value.
887 void X86ATTAsmPrinter::printHiddenGVStub(const char *GV, const char *Prefix) {
889 printSuffixedName(GV, "$non_lazy_ptr", Prefix);
890 if (Prefix) O << Prefix;
891 O << ":\n" << TAI->getData32bitsDirective() << GV << '\n';
895 bool X86ATTAsmPrinter::doFinalization(Module &M) {
896 // Print out module-level global variables here.
897 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
899 printModuleLevelGV(I);
901 if (I->hasDLLExportLinkage())
902 DLLExportedGVs.insert(Mang->makeNameProper(I->getName(),""));
905 // Output linker support code for dllexported globals
906 if (!DLLExportedGVs.empty())
907 SwitchToDataSection(".section .drectve");
909 for (StringSet<>::iterator i = DLLExportedGVs.begin(),
910 e = DLLExportedGVs.end();
912 O << "\t.ascii \" -export:" << i->getKeyData() << ",data\"\n";
914 if (!DLLExportedFns.empty()) {
915 SwitchToDataSection(".section .drectve");
918 for (StringSet<>::iterator i = DLLExportedFns.begin(),
919 e = DLLExportedFns.end();
921 O << "\t.ascii \" -export:" << i->getKeyData() << "\"\n";
923 if (Subtarget->isTargetDarwin()) {
924 SwitchToDataSection("");
926 // Output stubs for dynamically-linked functions
927 for (StringSet<>::iterator i = FnStubs.begin(), e = FnStubs.end();
929 SwitchToDataSection("\t.section __IMPORT,__jump_table,symbol_stubs,"
930 "self_modifying_code+pure_instructions,5", 0);
931 const char *p = i->getKeyData();
932 printSuffixedName(p, "$stub");
934 "\t.indirect_symbol " << p << "\n"
935 "\thlt ; hlt ; hlt ; hlt ; hlt\n";
940 // Print global value stubs.
941 bool InStubSection = false;
942 if (TAI->doesSupportExceptionHandling() && MMI && !Subtarget->is64Bit()) {
943 // Add the (possibly multiple) personalities to the set of global values.
944 // Only referenced functions get into the Personalities list.
945 const std::vector<Function *>& Personalities = MMI->getPersonalities();
946 for (std::vector<Function *>::const_iterator I = Personalities.begin(),
947 E = Personalities.end(); I != E; ++I) {
950 if (!InStubSection) {
952 "\t.section __IMPORT,__pointers,non_lazy_symbol_pointers");
953 InStubSection = true;
955 printGVStub((*I)->getNameStart(), "_");
959 // Output stubs for external and common global variables.
960 if (!InStubSection && !GVStubs.empty())
962 "\t.section __IMPORT,__pointers,non_lazy_symbol_pointers");
963 for (StringSet<>::iterator i = GVStubs.begin(), e = GVStubs.end();
965 printGVStub(i->getKeyData());
967 if (!HiddenGVStubs.empty()) {
968 SwitchToSection(TAI->getDataSection());
969 for (StringSet<>::iterator i = HiddenGVStubs.begin(), e = HiddenGVStubs.end();
971 printHiddenGVStub(i->getKeyData());
974 // Emit final debug information.
975 DwarfWriter *DW = getAnalysisToUpdate<DwarfWriter>();
978 // Funny Darwin hack: This flag tells the linker that no global symbols
979 // contain code that falls through to other global symbols (e.g. the obvious
980 // implementation of multiple entry points). If this doesn't occur, the
981 // linker can safely perform dead code stripping. Since LLVM never
982 // generates code that does this, it is always safe to set.
983 O << "\t.subsections_via_symbols\n";
984 } else if (Subtarget->isTargetCygMing()) {
985 // Emit type information for external functions
986 for (StringSet<>::iterator i = FnStubs.begin(), e = FnStubs.end();
988 O << "\t.def\t " << i->getKeyData()
989 << ";\t.scl\t" << COFF::C_EXT
990 << ";\t.type\t" << (COFF::DT_FCN << COFF::N_BTSHFT)
994 // Emit final debug information.
995 DwarfWriter *DW = getAnalysisToUpdate<DwarfWriter>();
997 } else if (Subtarget->isTargetELF()) {
998 // Emit final debug information.
999 DwarfWriter *DW = getAnalysisToUpdate<DwarfWriter>();
1003 return AsmPrinter::doFinalization(M);
1006 // Include the auto-generated portion of the assembly writer.
1007 #include "X86GenAsmWriter.inc"