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->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();
152 decorateName(CurrentFnName, F);
154 SwitchToSection(TAI->SectionForGlobal(F));
156 unsigned FnAlign = OptimizeForSize ? 1 : 4;
157 if (!F->isDeclaration() && F->hasNote(Attribute::OptimizeForSize))
159 switch (F->getLinkage()) {
160 default: assert(0 && "Unknown linkage type!");
161 case Function::InternalLinkage: // Symbols default to internal.
162 EmitAlignment(FnAlign, F);
164 case Function::DLLExportLinkage:
165 case Function::ExternalLinkage:
166 EmitAlignment(FnAlign, F);
167 O << "\t.globl\t" << CurrentFnName << '\n';
169 case Function::LinkOnceLinkage:
170 case Function::WeakLinkage:
171 EmitAlignment(FnAlign, F);
172 if (Subtarget->isTargetDarwin()) {
173 O << "\t.globl\t" << CurrentFnName << '\n';
174 O << TAI->getWeakDefDirective() << CurrentFnName << '\n';
175 } else if (Subtarget->isTargetCygMing()) {
176 O << "\t.globl\t" << CurrentFnName << "\n"
177 "\t.linkonce discard\n";
179 O << "\t.weak\t" << CurrentFnName << '\n';
184 printVisibility(CurrentFnName, F->getVisibility());
186 if (Subtarget->isTargetELF())
187 O << "\t.type\t" << CurrentFnName << ",@function\n";
188 else if (Subtarget->isTargetCygMing()) {
189 O << "\t.def\t " << CurrentFnName
191 (F->getLinkage() == Function::InternalLinkage ? COFF::C_STAT : COFF::C_EXT)
192 << ";\t.type\t" << (COFF::DT_FCN << COFF::N_BTSHFT)
196 O << CurrentFnName << ":\n";
197 // Add some workaround for linkonce linkage on Cygwin\MinGW
198 if (Subtarget->isTargetCygMing() &&
199 (F->getLinkage() == Function::LinkOnceLinkage ||
200 F->getLinkage() == Function::WeakLinkage))
201 O << "Lllvm$workaround$fake$stub$" << CurrentFnName << ":\n";
204 /// runOnMachineFunction - This uses the printMachineInstruction()
205 /// method to print assembly for each instruction.
207 bool X86ATTAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
208 const Function *F = MF.getFunction();
209 unsigned CC = F->getCallingConv();
211 SetupMachineFunction(MF);
214 // Populate function information map. Actually, We don't want to populate
215 // non-stdcall or non-fastcall functions' information right now.
216 if (CC == CallingConv::X86_StdCall || CC == CallingConv::X86_FastCall)
217 FunctionInfoMap[F] = *MF.getInfo<X86MachineFunctionInfo>();
219 // Print out constants referenced by the function
220 EmitConstantPool(MF.getConstantPool());
222 if (F->hasDLLExportLinkage())
223 DLLExportedFns.insert(Mang->makeNameProper(F->getName(), ""));
225 // Print the 'header' of function
226 emitFunctionHeader(MF);
228 // Emit pre-function debug and/or EH information.
229 if (TAI->doesSupportDebugInformation() || TAI->doesSupportExceptionHandling())
230 DW.BeginFunction(&MF);
232 // Print out code for the function.
233 bool hasAnyRealCode = false;
234 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
236 // Print a label for the basic block.
237 if (!I->pred_empty()) {
238 printBasicBlockLabel(I, true, true);
241 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
243 // Print the assembly for the instruction.
245 hasAnyRealCode = true;
246 printMachineInstruction(II);
250 if (Subtarget->isTargetDarwin() && !hasAnyRealCode) {
251 // If the function is empty, then we need to emit *something*. Otherwise,
252 // the function's label might be associated with something that it wasn't
253 // meant to be associated with. We emit a noop in this situation.
254 // We are assuming inline asms are code.
258 if (TAI->hasDotTypeDotSizeDirective())
259 O << "\t.size\t" << CurrentFnName << ", .-" << CurrentFnName << '\n';
261 // Emit post-function debug information.
262 if (TAI->doesSupportDebugInformation())
265 // Print out jump tables referenced by the function.
266 EmitJumpTableInfo(MF.getJumpTableInfo(), MF);
268 // We didn't modify anything.
272 static inline bool shouldPrintGOT(TargetMachine &TM, const X86Subtarget* ST) {
273 return ST->isPICStyleGOT() && TM.getRelocationModel() == Reloc::PIC_;
276 static inline bool shouldPrintPLT(TargetMachine &TM, const X86Subtarget* ST) {
277 return ST->isTargetELF() && TM.getRelocationModel() == Reloc::PIC_ &&
278 (ST->isPICStyleRIPRel() || ST->isPICStyleGOT());
281 static inline bool shouldPrintStub(TargetMachine &TM, const X86Subtarget* ST) {
282 return ST->isPICStyleStub() && TM.getRelocationModel() != Reloc::Static;
285 void X86ATTAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
286 const char *Modifier, bool NotRIPRel) {
287 const MachineOperand &MO = MI->getOperand(OpNo);
288 switch (MO.getType()) {
289 case MachineOperand::MO_Register: {
290 assert(TargetRegisterInfo::isPhysicalRegister(MO.getReg()) &&
291 "Virtual registers should not make it this far!");
293 unsigned Reg = MO.getReg();
294 if (Modifier && strncmp(Modifier, "subreg", strlen("subreg")) == 0) {
295 MVT VT = (strcmp(Modifier+6,"64") == 0) ?
296 MVT::i64 : ((strcmp(Modifier+6, "32") == 0) ? MVT::i32 :
297 ((strcmp(Modifier+6,"16") == 0) ? MVT::i16 : MVT::i8));
298 Reg = getX86SubSuperRegister(Reg, VT);
300 O << TRI->getAsmName(Reg);
304 case MachineOperand::MO_Immediate:
306 (strcmp(Modifier, "debug") && strcmp(Modifier, "mem")))
310 case MachineOperand::MO_MachineBasicBlock:
311 printBasicBlockLabel(MO.getMBB());
313 case MachineOperand::MO_JumpTableIndex: {
314 bool isMemOp = Modifier && !strcmp(Modifier, "mem");
315 if (!isMemOp) O << '$';
316 O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber() << '_'
319 if (TM.getRelocationModel() == Reloc::PIC_) {
320 if (Subtarget->isPICStyleStub())
321 O << "-\"" << TAI->getPrivateGlobalPrefix() << getFunctionNumber()
323 else if (Subtarget->isPICStyleGOT())
327 if (isMemOp && Subtarget->isPICStyleRIPRel() && !NotRIPRel)
331 case MachineOperand::MO_ConstantPoolIndex: {
332 bool isMemOp = Modifier && !strcmp(Modifier, "mem");
333 if (!isMemOp) O << '$';
334 O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
337 if (TM.getRelocationModel() == Reloc::PIC_) {
338 if (Subtarget->isPICStyleStub())
339 O << "-\"" << TAI->getPrivateGlobalPrefix() << getFunctionNumber()
341 else if (Subtarget->isPICStyleGOT())
345 int Offset = MO.getOffset();
351 if (isMemOp && Subtarget->isPICStyleRIPRel() && !NotRIPRel)
355 case MachineOperand::MO_GlobalAddress: {
356 bool isCallOp = Modifier && !strcmp(Modifier, "call");
357 bool isMemOp = Modifier && !strcmp(Modifier, "mem");
358 bool needCloseParen = false;
360 const GlobalValue *GV = MO.getGlobal();
361 const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV);
363 // If GV is an alias then use the aliasee for determining
365 if (const GlobalAlias *GA = dyn_cast<GlobalAlias>(GV))
366 GVar = dyn_cast_or_null<GlobalVariable>(GA->resolveAliasedGlobal(false));
369 bool isThreadLocal = GVar && GVar->isThreadLocal();
371 std::string Name = Mang->getValueName(GV);
372 decorateName(Name, GV);
374 if (!isMemOp && !isCallOp)
376 else if (Name[0] == '$') {
377 // The name begins with a dollar-sign. In order to avoid having it look
378 // like an integer immediate to the assembler, enclose it in parens.
380 needCloseParen = true;
383 if (shouldPrintStub(TM, Subtarget)) {
384 // Link-once, declaration, or Weakly-linked global variables need
385 // non-lazily-resolved stubs
386 if (GV->isDeclaration() || GV->isWeakForLinker()) {
387 // Dynamically-resolved functions need a stub for the function.
388 if (isCallOp && isa<Function>(GV)) {
389 // Function stubs are no longer needed for Mac OS X 10.5 and up.
390 if (Subtarget->isTargetDarwin() && Subtarget->getDarwinVers() >= 9) {
393 FnStubs.insert(Name);
394 printSuffixedName(Name, "$stub");
397 GVStubs.insert(Name);
398 printSuffixedName(Name, "$non_lazy_ptr");
401 if (GV->hasDLLImportLinkage())
406 if (!isCallOp && TM.getRelocationModel() == Reloc::PIC_)
407 O << '-' << getPICLabelString(getFunctionNumber(), TAI, Subtarget);
409 if (GV->hasDLLImportLinkage()) {
415 if (shouldPrintPLT(TM, Subtarget)) {
416 // Assemble call via PLT for externally visible symbols
417 if (!GV->hasHiddenVisibility() && !GV->hasProtectedVisibility() &&
418 !GV->hasInternalLinkage())
421 if (Subtarget->isTargetCygMing() && GV->isDeclaration())
422 // Save function name for later type emission
423 FnStubs.insert(Name);
427 if (GV->hasExternalWeakLinkage())
428 ExtWeakSymbols.insert(GV);
430 int Offset = MO.getOffset();
437 if (TM.getRelocationModel() == Reloc::PIC_ || Subtarget->is64Bit())
438 O << "@TLSGD"; // general dynamic TLS model
440 if (GV->isDeclaration())
441 O << "@INDNTPOFF"; // initial exec TLS model
443 O << "@NTPOFF"; // local exec TLS model
444 } else if (isMemOp) {
445 if (shouldPrintGOT(TM, Subtarget)) {
446 if (Subtarget->GVRequiresExtraLoad(GV, TM, false))
450 } else if (Subtarget->isPICStyleRIPRel() && !NotRIPRel &&
451 TM.getRelocationModel() != Reloc::Static) {
452 if (Subtarget->GVRequiresExtraLoad(GV, TM, false))
455 if (needCloseParen) {
456 needCloseParen = false;
460 // Use rip when possible to reduce code size, except when
461 // index or base register are also part of the address. e.g.
462 // foo(%rip)(%rcx,%rax,4) is not legal
472 case MachineOperand::MO_ExternalSymbol: {
473 bool isCallOp = Modifier && !strcmp(Modifier, "call");
474 bool needCloseParen = false;
475 std::string Name(TAI->getGlobalPrefix());
476 Name += MO.getSymbolName();
477 // Print function stub suffix unless it's Mac OS X 10.5 and up.
478 if (isCallOp && shouldPrintStub(TM, Subtarget) &&
479 !(Subtarget->isTargetDarwin() && Subtarget->getDarwinVers() >= 9)) {
480 FnStubs.insert(Name);
481 printSuffixedName(Name, "$stub");
486 else if (Name[0] == '$') {
487 // The name begins with a dollar-sign. In order to avoid having it look
488 // like an integer immediate to the assembler, enclose it in parens.
490 needCloseParen = true;
495 if (shouldPrintPLT(TM, Subtarget)) {
496 std::string GOTName(TAI->getGlobalPrefix());
497 GOTName+="_GLOBAL_OFFSET_TABLE_";
499 // HACK! Emit extra offset to PC during printing GOT offset to
500 // compensate for the size of popl instruction. The resulting code
504 // popl %some_register
505 // addl $_GLOBAL_ADDRESS_TABLE_ + [.-piclabel], %some_register
507 << getPICLabelString(getFunctionNumber(), TAI, Subtarget) << ']';
516 if (!isCallOp && Subtarget->isPICStyleRIPRel())
522 O << "<unknown operand type>"; return;
526 void X86ATTAsmPrinter::printSSECC(const MachineInstr *MI, unsigned Op) {
527 unsigned char value = MI->getOperand(Op).getImm();
528 assert(value <= 7 && "Invalid ssecc argument!");
530 case 0: O << "eq"; break;
531 case 1: O << "lt"; break;
532 case 2: O << "le"; break;
533 case 3: O << "unord"; break;
534 case 4: O << "neq"; break;
535 case 5: O << "nlt"; break;
536 case 6: O << "nle"; break;
537 case 7: O << "ord"; break;
541 void X86ATTAsmPrinter::printMemReference(const MachineInstr *MI, unsigned Op,
542 const char *Modifier){
543 assert(isMem(MI, Op) && "Invalid memory reference!");
544 MachineOperand BaseReg = MI->getOperand(Op);
545 MachineOperand IndexReg = MI->getOperand(Op+2);
546 const MachineOperand &DispSpec = MI->getOperand(Op+3);
548 bool NotRIPRel = IndexReg.getReg() || BaseReg.getReg();
549 if (DispSpec.isGlobalAddress() ||
550 DispSpec.isConstantPoolIndex() ||
551 DispSpec.isJumpTableIndex()) {
552 printOperand(MI, Op+3, "mem", NotRIPRel);
554 int DispVal = DispSpec.getImm();
555 if (DispVal || (!IndexReg.getReg() && !BaseReg.getReg()))
559 if (IndexReg.getReg() || BaseReg.getReg()) {
560 unsigned ScaleVal = MI->getOperand(Op+1).getImm();
561 unsigned BaseRegOperand = 0, IndexRegOperand = 2;
563 // There are cases where we can end up with ESP/RSP in the indexreg slot.
564 // If this happens, swap the base/index register to support assemblers that
565 // don't work when the index is *SP.
566 if (IndexReg.getReg() == X86::ESP || IndexReg.getReg() == X86::RSP) {
567 assert(ScaleVal == 1 && "Scale not supported for stack pointer!");
568 std::swap(BaseReg, IndexReg);
569 std::swap(BaseRegOperand, IndexRegOperand);
573 if (BaseReg.getReg())
574 printOperand(MI, Op+BaseRegOperand, Modifier);
576 if (IndexReg.getReg()) {
578 printOperand(MI, Op+IndexRegOperand, Modifier);
580 O << ',' << ScaleVal;
586 void X86ATTAsmPrinter::printPICJumpTableSetLabel(unsigned uid,
587 const MachineBasicBlock *MBB) const {
588 if (!TAI->getSetDirective())
591 // We don't need .set machinery if we have GOT-style relocations
592 if (Subtarget->isPICStyleGOT())
595 O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix()
596 << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ',';
597 printBasicBlockLabel(MBB, false, false, false);
598 if (Subtarget->isPICStyleRIPRel())
599 O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
600 << '_' << uid << '\n';
602 O << '-' << getPICLabelString(getFunctionNumber(), TAI, Subtarget) << '\n';
605 void X86ATTAsmPrinter::printPICLabel(const MachineInstr *MI, unsigned Op) {
606 std::string label = getPICLabelString(getFunctionNumber(), TAI, Subtarget);
607 O << label << '\n' << label << ':';
611 void X86ATTAsmPrinter::printPICJumpTableEntry(const MachineJumpTableInfo *MJTI,
612 const MachineBasicBlock *MBB,
615 const char *JTEntryDirective = MJTI->getEntrySize() == 4 ?
616 TAI->getData32bitsDirective() : TAI->getData64bitsDirective();
618 O << JTEntryDirective << ' ';
620 if (TM.getRelocationModel() == Reloc::PIC_) {
621 if (Subtarget->isPICStyleRIPRel() || Subtarget->isPICStyleStub()) {
622 O << TAI->getPrivateGlobalPrefix() << getFunctionNumber()
623 << '_' << uid << "_set_" << MBB->getNumber();
624 } else if (Subtarget->isPICStyleGOT()) {
625 printBasicBlockLabel(MBB, false, false, false);
628 assert(0 && "Don't know how to print MBB label for this PIC mode");
630 printBasicBlockLabel(MBB, false, false, false);
633 bool X86ATTAsmPrinter::printAsmMRegister(const MachineOperand &MO,
635 unsigned Reg = MO.getReg();
637 default: return true; // Unknown mode.
638 case 'b': // Print QImode register
639 Reg = getX86SubSuperRegister(Reg, MVT::i8);
641 case 'h': // Print QImode high register
642 Reg = getX86SubSuperRegister(Reg, MVT::i8, true);
644 case 'w': // Print HImode register
645 Reg = getX86SubSuperRegister(Reg, MVT::i16);
647 case 'k': // Print SImode register
648 Reg = getX86SubSuperRegister(Reg, MVT::i32);
650 case 'q': // Print DImode register
651 Reg = getX86SubSuperRegister(Reg, MVT::i64);
655 O << '%'<< TRI->getAsmName(Reg);
659 /// PrintAsmOperand - Print out an operand for an inline asm expression.
661 bool X86ATTAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
663 const char *ExtraCode) {
664 // Does this asm operand have a single letter operand modifier?
665 if (ExtraCode && ExtraCode[0]) {
666 if (ExtraCode[1] != 0) return true; // Unknown modifier.
668 switch (ExtraCode[0]) {
669 default: return true; // Unknown modifier.
670 case 'c': // Don't print "$" before a global var name or constant.
671 printOperand(MI, OpNo, "mem");
673 case 'b': // Print QImode register
674 case 'h': // Print QImode high register
675 case 'w': // Print HImode register
676 case 'k': // Print SImode register
677 case 'q': // Print DImode register
678 if (MI->getOperand(OpNo).isRegister())
679 return printAsmMRegister(MI->getOperand(OpNo), ExtraCode[0]);
680 printOperand(MI, OpNo);
683 case 'P': // Don't print @PLT, but do print as memory.
684 printOperand(MI, OpNo, "mem");
689 printOperand(MI, OpNo);
693 bool X86ATTAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
696 const char *ExtraCode) {
697 if (ExtraCode && ExtraCode[0]) {
698 if (ExtraCode[1] != 0) return true; // Unknown modifier.
700 switch (ExtraCode[0]) {
701 default: return true; // Unknown modifier.
702 case 'b': // Print QImode register
703 case 'h': // Print QImode high register
704 case 'w': // Print HImode register
705 case 'k': // Print SImode register
706 case 'q': // Print SImode register
707 // These only apply to registers, ignore on mem.
711 printMemReference(MI, OpNo);
715 /// printMachineInstruction -- Print out a single X86 LLVM instruction
716 /// MI in AT&T syntax to the current output stream.
718 void X86ATTAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
721 // Call the autogenerated instruction printer routines.
722 printInstruction(MI);
726 bool X86ATTAsmPrinter::doInitialization(Module &M) {
727 if (TAI->doesSupportDebugInformation()) {
728 // Emit initial debug information.
732 bool Result = AsmPrinter::doInitialization(M);
734 if (TAI->doesSupportDebugInformation()) {
735 // Let PassManager know we need debug information and relay
736 // the MachineModuleInfo address on to DwarfWriter.
737 // AsmPrinter::doInitialization did this analysis.
738 MMI = getAnalysisToUpdate<MachineModuleInfo>();
739 DW.SetModuleInfo(MMI);
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->getABITypeSize(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->hasInternalLinkage() || GVar->isWeakForLinker())) {
794 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
796 if (TAI->getLCOMMDirective() != NULL) {
797 if (GVar->hasInternalLinkage()) {
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->hasInternalLinkage())
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::InternalLinkage:
856 assert(0 && "Unknown linkage type!");
859 EmitAlignment(Align, GVar);
860 O << name << ":\t\t\t\t" << TAI->getCommentString() << ' ';
861 PrintUnmangledNameSafely(GVar, O);
863 if (TAI->hasDotTypeDotSizeDirective())
864 O << "\t.size\t" << name << ", " << Size << '\n';
866 // If the initializer is a extern weak symbol, remember to emit the weak
868 if (const GlobalValue *GV = dyn_cast<GlobalValue>(C))
869 if (GV->hasExternalWeakLinkage())
870 ExtWeakSymbols.insert(GV);
872 EmitGlobalConstant(C);
875 /// printGVStub - Print stub for a global value.
877 void X86ATTAsmPrinter::printGVStub(const char *GV, const char *Prefix) {
878 printSuffixedName(GV, "$non_lazy_ptr", Prefix);
879 O << ":\n\t.indirect_symbol ";
880 if (Prefix) O << Prefix;
881 O << GV << "\n\t.long\t0\n";
885 bool X86ATTAsmPrinter::doFinalization(Module &M) {
886 // Print out module-level global variables here.
887 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
889 printModuleLevelGV(I);
891 if (I->hasDLLExportLinkage())
892 DLLExportedGVs.insert(Mang->makeNameProper(I->getName(),""));
895 // Output linker support code for dllexported globals
896 if (!DLLExportedGVs.empty())
897 SwitchToDataSection(".section .drectve");
899 for (StringSet<>::iterator i = DLLExportedGVs.begin(),
900 e = DLLExportedGVs.end();
902 O << "\t.ascii \" -export:" << i->getKeyData() << ",data\"\n";
904 if (!DLLExportedFns.empty()) {
905 SwitchToDataSection(".section .drectve");
908 for (StringSet<>::iterator i = DLLExportedFns.begin(),
909 e = DLLExportedFns.end();
911 O << "\t.ascii \" -export:" << i->getKeyData() << "\"\n";
913 if (Subtarget->isTargetDarwin()) {
914 SwitchToDataSection("");
916 // Output stubs for dynamically-linked functions
918 for (StringSet<>::iterator i = FnStubs.begin(), e = FnStubs.end();
920 SwitchToDataSection("\t.section __IMPORT,__jump_table,symbol_stubs,"
921 "self_modifying_code+pure_instructions,5", 0);
922 const char *p = i->getKeyData();
923 printSuffixedName(p, "$stub");
925 "\t.indirect_symbol " << p << "\n"
926 "\thlt ; hlt ; hlt ; hlt ; hlt\n";
931 // Print global value stubs.
932 bool InStubSection = false;
933 if (TAI->doesSupportExceptionHandling() && MMI && !Subtarget->is64Bit()) {
934 // Add the (possibly multiple) personalities to the set of global values.
935 // Only referenced functions get into the Personalities list.
936 const std::vector<Function *>& Personalities = MMI->getPersonalities();
937 for (std::vector<Function *>::const_iterator I = Personalities.begin(),
938 E = Personalities.end(); I != E; ++I) {
941 if (!InStubSection) {
943 "\t.section __IMPORT,__pointers,non_lazy_symbol_pointers");
944 InStubSection = true;
946 printGVStub((*I)->getNameStart(), "_");
950 // Output stubs for external and common global variables.
951 if (!InStubSection && !GVStubs.empty())
953 "\t.section __IMPORT,__pointers,non_lazy_symbol_pointers");
954 for (StringSet<>::iterator i = GVStubs.begin(), e = GVStubs.end();
956 printGVStub(i->getKeyData());
958 // Emit final debug information.
961 // Funny Darwin hack: This flag tells the linker that no global symbols
962 // contain code that falls through to other global symbols (e.g. the obvious
963 // implementation of multiple entry points). If this doesn't occur, the
964 // linker can safely perform dead code stripping. Since LLVM never
965 // generates code that does this, it is always safe to set.
966 O << "\t.subsections_via_symbols\n";
967 } else if (Subtarget->isTargetCygMing()) {
968 // Emit type information for external functions
969 for (StringSet<>::iterator i = FnStubs.begin(), e = FnStubs.end();
971 O << "\t.def\t " << i->getKeyData()
972 << ";\t.scl\t" << COFF::C_EXT
973 << ";\t.type\t" << (COFF::DT_FCN << COFF::N_BTSHFT)
977 // Emit final debug information.
979 } else if (Subtarget->isTargetELF()) {
980 // Emit final debug information.
984 return AsmPrinter::doFinalization(M);
987 // Include the auto-generated portion of the assembly writer.
988 #include "X86GenAsmWriter.inc"