1 //===-- AsmPrinter.cpp - Common AsmPrinter code ---------------------------===//
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 implements the AsmPrinter class.
12 //===----------------------------------------------------------------------===//
14 #define DEBUG_TYPE "asm-printer"
15 #include "llvm/CodeGen/AsmPrinter.h"
16 #include "DwarfDebug.h"
17 #include "DwarfException.h"
18 #include "llvm/Module.h"
19 #include "llvm/CodeGen/GCMetadataPrinter.h"
20 #include "llvm/CodeGen/MachineConstantPool.h"
21 #include "llvm/CodeGen/MachineFrameInfo.h"
22 #include "llvm/CodeGen/MachineFunction.h"
23 #include "llvm/CodeGen/MachineJumpTableInfo.h"
24 #include "llvm/CodeGen/MachineLoopInfo.h"
25 #include "llvm/CodeGen/MachineModuleInfo.h"
26 #include "llvm/Analysis/ConstantFolding.h"
27 #include "llvm/Analysis/DebugInfo.h"
28 #include "llvm/MC/MCAsmInfo.h"
29 #include "llvm/MC/MCContext.h"
30 #include "llvm/MC/MCExpr.h"
31 #include "llvm/MC/MCInst.h"
32 #include "llvm/MC/MCSection.h"
33 #include "llvm/MC/MCStreamer.h"
34 #include "llvm/MC/MCSymbol.h"
35 #include "llvm/Target/Mangler.h"
36 #include "llvm/Target/TargetData.h"
37 #include "llvm/Target/TargetInstrInfo.h"
38 #include "llvm/Target/TargetLowering.h"
39 #include "llvm/Target/TargetLoweringObjectFile.h"
40 #include "llvm/Target/TargetOptions.h"
41 #include "llvm/Target/TargetRegisterInfo.h"
42 #include "llvm/Assembly/Writer.h"
43 #include "llvm/ADT/SmallString.h"
44 #include "llvm/ADT/Statistic.h"
45 #include "llvm/Support/ErrorHandling.h"
46 #include "llvm/Support/Format.h"
47 #include "llvm/Support/MathExtras.h"
48 #include "llvm/Support/Timer.h"
51 static const char *DWARFGroupName = "DWARF Emission";
52 static const char *DbgTimerName = "DWARF Debug Writer";
53 static const char *EHTimerName = "DWARF Exception Writer";
55 STATISTIC(EmittedInsts, "Number of machine instrs printed");
57 char AsmPrinter::ID = 0;
59 typedef DenseMap<GCStrategy*,GCMetadataPrinter*> gcp_map_type;
60 static gcp_map_type &getGCMap(void *&P) {
62 P = new gcp_map_type();
63 return *(gcp_map_type*)P;
67 /// getGVAlignmentLog2 - Return the alignment to use for the specified global
68 /// value in log2 form. This rounds up to the preferred alignment if possible
70 static unsigned getGVAlignmentLog2(const GlobalValue *GV, const TargetData &TD,
71 unsigned InBits = 0) {
73 if (const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV))
74 NumBits = TD.getPreferredAlignmentLog(GVar);
76 // If InBits is specified, round it to it.
80 // If the GV has a specified alignment, take it into account.
81 if (GV->getAlignment() == 0)
84 unsigned GVAlign = Log2_32(GV->getAlignment());
86 // If the GVAlign is larger than NumBits, or if we are required to obey
87 // NumBits because the GV has an assigned section, obey it.
88 if (GVAlign > NumBits || GV->hasSection())
96 AsmPrinter::AsmPrinter(TargetMachine &tm, MCStreamer &Streamer)
97 : MachineFunctionPass(ID),
98 TM(tm), MAI(tm.getMCAsmInfo()),
99 OutContext(Streamer.getContext()),
100 OutStreamer(Streamer),
101 LastMI(0), LastFn(0), Counter(~0U), SetCounter(0) {
102 DD = 0; DE = 0; MMI = 0; LI = 0;
103 GCMetadataPrinters = 0;
104 VerboseAsm = Streamer.isVerboseAsm();
107 AsmPrinter::~AsmPrinter() {
108 assert(DD == 0 && DE == 0 && "Debug/EH info didn't get finalized");
110 if (GCMetadataPrinters != 0) {
111 gcp_map_type &GCMap = getGCMap(GCMetadataPrinters);
113 for (gcp_map_type::iterator I = GCMap.begin(), E = GCMap.end(); I != E; ++I)
116 GCMetadataPrinters = 0;
122 /// getFunctionNumber - Return a unique ID for the current function.
124 unsigned AsmPrinter::getFunctionNumber() const {
125 return MF->getFunctionNumber();
128 const TargetLoweringObjectFile &AsmPrinter::getObjFileLowering() const {
129 return TM.getTargetLowering()->getObjFileLowering();
133 /// getTargetData - Return information about data layout.
134 const TargetData &AsmPrinter::getTargetData() const {
135 return *TM.getTargetData();
138 /// getCurrentSection() - Return the current section we are emitting to.
139 const MCSection *AsmPrinter::getCurrentSection() const {
140 return OutStreamer.getCurrentSection();
145 void AsmPrinter::getAnalysisUsage(AnalysisUsage &AU) const {
146 AU.setPreservesAll();
147 MachineFunctionPass::getAnalysisUsage(AU);
148 AU.addRequired<MachineModuleInfo>();
149 AU.addRequired<GCModuleInfo>();
151 AU.addRequired<MachineLoopInfo>();
154 bool AsmPrinter::doInitialization(Module &M) {
155 MMI = getAnalysisIfAvailable<MachineModuleInfo>();
156 MMI->AnalyzeModule(M);
158 // Initialize TargetLoweringObjectFile.
159 const_cast<TargetLoweringObjectFile&>(getObjFileLowering())
160 .Initialize(OutContext, TM);
162 Mang = new Mangler(OutContext, *TM.getTargetData());
164 // Allow the target to emit any magic that it wants at the start of the file.
165 EmitStartOfAsmFile(M);
167 // Very minimal debug info. It is ignored if we emit actual debug info. If we
168 // don't, this at least helps the user find where a global came from.
169 if (MAI->hasSingleParameterDotFile()) {
171 OutStreamer.EmitFileDirective(M.getModuleIdentifier());
174 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
175 assert(MI && "AsmPrinter didn't require GCModuleInfo?");
176 for (GCModuleInfo::iterator I = MI->begin(), E = MI->end(); I != E; ++I)
177 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I))
178 MP->beginAssembly(*this);
180 // Emit module-level inline asm if it exists.
181 if (!M.getModuleInlineAsm().empty()) {
182 OutStreamer.AddComment("Start of file scope inline assembly");
183 OutStreamer.AddBlankLine();
184 EmitInlineAsm(M.getModuleInlineAsm()+"\n");
185 OutStreamer.AddComment("End of file scope inline assembly");
186 OutStreamer.AddBlankLine();
189 if (MAI->doesSupportDebugInformation())
190 DD = new DwarfDebug(this, &M);
192 switch (MAI->getExceptionHandlingType()) {
193 case ExceptionHandling::None:
195 case ExceptionHandling::SjLj:
196 case ExceptionHandling::DwarfCFI:
197 DE = new DwarfCFIException(this);
199 case ExceptionHandling::ARM:
200 DE = new ARMException(this);
202 case ExceptionHandling::Win64:
203 DE = new Win64Exception(this);
207 llvm_unreachable("Unknown exception type.");
210 void AsmPrinter::EmitLinkage(unsigned Linkage, MCSymbol *GVSym) const {
211 switch ((GlobalValue::LinkageTypes)Linkage) {
212 case GlobalValue::CommonLinkage:
213 case GlobalValue::LinkOnceAnyLinkage:
214 case GlobalValue::LinkOnceODRLinkage:
215 case GlobalValue::WeakAnyLinkage:
216 case GlobalValue::WeakODRLinkage:
217 case GlobalValue::LinkerPrivateWeakLinkage:
218 case GlobalValue::LinkerPrivateWeakDefAutoLinkage:
219 if (MAI->getWeakDefDirective() != 0) {
221 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
223 if ((GlobalValue::LinkageTypes)Linkage !=
224 GlobalValue::LinkerPrivateWeakDefAutoLinkage)
225 // .weak_definition _foo
226 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_WeakDefinition);
228 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_WeakDefAutoPrivate);
229 } else if (MAI->getLinkOnceDirective() != 0) {
231 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
232 //NOTE: linkonce is handled by the section the symbol was assigned to.
235 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Weak);
238 case GlobalValue::DLLExportLinkage:
239 case GlobalValue::AppendingLinkage:
240 // FIXME: appending linkage variables should go into a section of
241 // their name or something. For now, just emit them as external.
242 case GlobalValue::ExternalLinkage:
243 // If external or appending, declare as a global symbol.
245 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
247 case GlobalValue::PrivateLinkage:
248 case GlobalValue::InternalLinkage:
249 case GlobalValue::LinkerPrivateLinkage:
252 llvm_unreachable("Unknown linkage type!");
257 /// EmitGlobalVariable - Emit the specified global variable to the .s file.
258 void AsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) {
259 if (GV->hasInitializer()) {
260 // Check to see if this is a special global used by LLVM, if so, emit it.
261 if (EmitSpecialLLVMGlobal(GV))
265 WriteAsOperand(OutStreamer.GetCommentOS(), GV,
266 /*PrintType=*/false, GV->getParent());
267 OutStreamer.GetCommentOS() << '\n';
271 MCSymbol *GVSym = Mang->getSymbol(GV);
272 EmitVisibility(GVSym, GV->getVisibility(), !GV->isDeclaration());
274 if (!GV->hasInitializer()) // External globals require no extra code.
277 if (MAI->hasDotTypeDotSizeDirective())
278 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_ELF_TypeObject);
280 SectionKind GVKind = TargetLoweringObjectFile::getKindForGlobal(GV, TM);
282 const TargetData *TD = TM.getTargetData();
283 uint64_t Size = TD->getTypeAllocSize(GV->getType()->getElementType());
285 // If the alignment is specified, we *must* obey it. Overaligning a global
286 // with a specified alignment is a prompt way to break globals emitted to
287 // sections and expected to be contiguous (e.g. ObjC metadata).
288 unsigned AlignLog = getGVAlignmentLog2(GV, *TD);
290 // Handle common and BSS local symbols (.lcomm).
291 if (GVKind.isCommon() || GVKind.isBSSLocal()) {
292 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
293 unsigned Align = 1 << AlignLog;
295 // Handle common symbols.
296 if (GVKind.isCommon()) {
297 if (!getObjFileLowering().getCommDirectiveSupportsAlignment())
301 OutStreamer.EmitCommonSymbol(GVSym, Size, Align);
305 // Handle local BSS symbols.
306 if (MAI->hasMachoZeroFillDirective()) {
307 const MCSection *TheSection =
308 getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM);
309 // .zerofill __DATA, __bss, _foo, 400, 5
310 OutStreamer.EmitZerofill(TheSection, GVSym, Size, Align);
314 if (MAI->getLCOMMDirectiveType() != LCOMM::None &&
315 (MAI->getLCOMMDirectiveType() != LCOMM::NoAlignment || Align == 1)) {
317 OutStreamer.EmitLocalCommonSymbol(GVSym, Size, Align);
321 if (!getObjFileLowering().getCommDirectiveSupportsAlignment())
325 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Local);
327 OutStreamer.EmitCommonSymbol(GVSym, Size, Align);
331 const MCSection *TheSection =
332 getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM);
334 // Handle the zerofill directive on darwin, which is a special form of BSS
336 if (GVKind.isBSSExtern() && MAI->hasMachoZeroFillDirective()) {
337 if (Size == 0) Size = 1; // zerofill of 0 bytes is undefined.
340 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
341 // .zerofill __DATA, __common, _foo, 400, 5
342 OutStreamer.EmitZerofill(TheSection, GVSym, Size, 1 << AlignLog);
346 // Handle thread local data for mach-o which requires us to output an
347 // additional structure of data and mangle the original symbol so that we
348 // can reference it later.
350 // TODO: This should become an "emit thread local global" method on TLOF.
351 // All of this macho specific stuff should be sunk down into TLOFMachO and
352 // stuff like "TLSExtraDataSection" should no longer be part of the parent
353 // TLOF class. This will also make it more obvious that stuff like
354 // MCStreamer::EmitTBSSSymbol is macho specific and only called from macho
356 if (GVKind.isThreadLocal() && MAI->hasMachoTBSSDirective()) {
357 // Emit the .tbss symbol
359 OutContext.GetOrCreateSymbol(GVSym->getName() + Twine("$tlv$init"));
361 if (GVKind.isThreadBSS())
362 OutStreamer.EmitTBSSSymbol(TheSection, MangSym, Size, 1 << AlignLog);
363 else if (GVKind.isThreadData()) {
364 OutStreamer.SwitchSection(TheSection);
366 EmitAlignment(AlignLog, GV);
367 OutStreamer.EmitLabel(MangSym);
369 EmitGlobalConstant(GV->getInitializer());
372 OutStreamer.AddBlankLine();
374 // Emit the variable struct for the runtime.
375 const MCSection *TLVSect
376 = getObjFileLowering().getTLSExtraDataSection();
378 OutStreamer.SwitchSection(TLVSect);
379 // Emit the linkage here.
380 EmitLinkage(GV->getLinkage(), GVSym);
381 OutStreamer.EmitLabel(GVSym);
383 // Three pointers in size:
384 // - __tlv_bootstrap - used to make sure support exists
385 // - spare pointer, used when mapped by the runtime
386 // - pointer to mangled symbol above with initializer
387 unsigned PtrSize = TD->getPointerSizeInBits()/8;
388 OutStreamer.EmitSymbolValue(GetExternalSymbolSymbol("_tlv_bootstrap"),
390 OutStreamer.EmitIntValue(0, PtrSize, 0);
391 OutStreamer.EmitSymbolValue(MangSym, PtrSize, 0);
393 OutStreamer.AddBlankLine();
397 OutStreamer.SwitchSection(TheSection);
399 EmitLinkage(GV->getLinkage(), GVSym);
400 EmitAlignment(AlignLog, GV);
402 OutStreamer.EmitLabel(GVSym);
404 EmitGlobalConstant(GV->getInitializer());
406 if (MAI->hasDotTypeDotSizeDirective())
408 OutStreamer.EmitELFSize(GVSym, MCConstantExpr::Create(Size, OutContext));
410 OutStreamer.AddBlankLine();
413 /// EmitFunctionHeader - This method emits the header for the current
415 void AsmPrinter::EmitFunctionHeader() {
416 // Print out constants referenced by the function
419 // Print the 'header' of function.
420 const Function *F = MF->getFunction();
422 OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang, TM));
423 EmitVisibility(CurrentFnSym, F->getVisibility());
425 EmitLinkage(F->getLinkage(), CurrentFnSym);
426 EmitAlignment(MF->getAlignment(), F);
428 if (MAI->hasDotTypeDotSizeDirective())
429 OutStreamer.EmitSymbolAttribute(CurrentFnSym, MCSA_ELF_TypeFunction);
432 WriteAsOperand(OutStreamer.GetCommentOS(), F,
433 /*PrintType=*/false, F->getParent());
434 OutStreamer.GetCommentOS() << '\n';
437 // Emit the CurrentFnSym. This is a virtual function to allow targets to
438 // do their wild and crazy things as required.
439 EmitFunctionEntryLabel();
441 // If the function had address-taken blocks that got deleted, then we have
442 // references to the dangling symbols. Emit them at the start of the function
443 // so that we don't get references to undefined symbols.
444 std::vector<MCSymbol*> DeadBlockSyms;
445 MMI->takeDeletedSymbolsForFunction(F, DeadBlockSyms);
446 for (unsigned i = 0, e = DeadBlockSyms.size(); i != e; ++i) {
447 OutStreamer.AddComment("Address taken block that was later removed");
448 OutStreamer.EmitLabel(DeadBlockSyms[i]);
451 // Add some workaround for linkonce linkage on Cygwin\MinGW.
452 if (MAI->getLinkOnceDirective() != 0 &&
453 (F->hasLinkOnceLinkage() || F->hasWeakLinkage())) {
454 // FIXME: What is this?
456 OutContext.GetOrCreateSymbol(Twine("Lllvm$workaround$fake$stub$")+
457 CurrentFnSym->getName());
458 OutStreamer.EmitLabel(FakeStub);
461 // Emit pre-function debug and/or EH information.
463 NamedRegionTimer T(EHTimerName, DWARFGroupName, TimePassesIsEnabled);
464 DE->BeginFunction(MF);
467 NamedRegionTimer T(DbgTimerName, DWARFGroupName, TimePassesIsEnabled);
468 DD->beginFunction(MF);
472 /// EmitFunctionEntryLabel - Emit the label that is the entrypoint for the
473 /// function. This can be overridden by targets as required to do custom stuff.
474 void AsmPrinter::EmitFunctionEntryLabel() {
475 // The function label could have already been emitted if two symbols end up
476 // conflicting due to asm renaming. Detect this and emit an error.
477 if (CurrentFnSym->isUndefined()) {
478 OutStreamer.ForceCodeRegion();
479 return OutStreamer.EmitLabel(CurrentFnSym);
482 report_fatal_error("'" + Twine(CurrentFnSym->getName()) +
483 "' label emitted multiple times to assembly file");
487 /// EmitComments - Pretty-print comments for instructions.
488 static void EmitComments(const MachineInstr &MI, raw_ostream &CommentOS) {
489 const MachineFunction *MF = MI.getParent()->getParent();
490 const TargetMachine &TM = MF->getTarget();
492 // Check for spills and reloads
495 const MachineFrameInfo *FrameInfo = MF->getFrameInfo();
497 // We assume a single instruction only has a spill or reload, not
499 const MachineMemOperand *MMO;
500 if (TM.getInstrInfo()->isLoadFromStackSlotPostFE(&MI, FI)) {
501 if (FrameInfo->isSpillSlotObjectIndex(FI)) {
502 MMO = *MI.memoperands_begin();
503 CommentOS << MMO->getSize() << "-byte Reload\n";
505 } else if (TM.getInstrInfo()->hasLoadFromStackSlot(&MI, MMO, FI)) {
506 if (FrameInfo->isSpillSlotObjectIndex(FI))
507 CommentOS << MMO->getSize() << "-byte Folded Reload\n";
508 } else if (TM.getInstrInfo()->isStoreToStackSlotPostFE(&MI, FI)) {
509 if (FrameInfo->isSpillSlotObjectIndex(FI)) {
510 MMO = *MI.memoperands_begin();
511 CommentOS << MMO->getSize() << "-byte Spill\n";
513 } else if (TM.getInstrInfo()->hasStoreToStackSlot(&MI, MMO, FI)) {
514 if (FrameInfo->isSpillSlotObjectIndex(FI))
515 CommentOS << MMO->getSize() << "-byte Folded Spill\n";
518 // Check for spill-induced copies
519 if (MI.getAsmPrinterFlag(MachineInstr::ReloadReuse))
520 CommentOS << " Reload Reuse\n";
523 /// EmitImplicitDef - This method emits the specified machine instruction
524 /// that is an implicit def.
525 static void EmitImplicitDef(const MachineInstr *MI, AsmPrinter &AP) {
526 unsigned RegNo = MI->getOperand(0).getReg();
527 AP.OutStreamer.AddComment(Twine("implicit-def: ") +
528 AP.TM.getRegisterInfo()->getName(RegNo));
529 AP.OutStreamer.AddBlankLine();
532 static void EmitKill(const MachineInstr *MI, AsmPrinter &AP) {
533 std::string Str = "kill:";
534 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
535 const MachineOperand &Op = MI->getOperand(i);
536 assert(Op.isReg() && "KILL instruction must have only register operands");
538 Str += AP.TM.getRegisterInfo()->getName(Op.getReg());
539 Str += (Op.isDef() ? "<def>" : "<kill>");
541 AP.OutStreamer.AddComment(Str);
542 AP.OutStreamer.AddBlankLine();
545 /// EmitDebugValueComment - This method handles the target-independent form
546 /// of DBG_VALUE, returning true if it was able to do so. A false return
547 /// means the target will need to handle MI in EmitInstruction.
548 static bool EmitDebugValueComment(const MachineInstr *MI, AsmPrinter &AP) {
549 // This code handles only the 3-operand target-independent form.
550 if (MI->getNumOperands() != 3)
553 SmallString<128> Str;
554 raw_svector_ostream OS(Str);
555 OS << '\t' << AP.MAI->getCommentString() << "DEBUG_VALUE: ";
557 // cast away const; DIetc do not take const operands for some reason.
558 DIVariable V(const_cast<MDNode*>(MI->getOperand(2).getMetadata()));
559 if (V.getContext().isSubprogram())
560 OS << DISubprogram(V.getContext()).getDisplayName() << ":";
561 OS << V.getName() << " <- ";
563 // Register or immediate value. Register 0 means undef.
564 if (MI->getOperand(0).isFPImm()) {
565 APFloat APF = APFloat(MI->getOperand(0).getFPImm()->getValueAPF());
566 if (MI->getOperand(0).getFPImm()->getType()->isFloatTy()) {
567 OS << (double)APF.convertToFloat();
568 } else if (MI->getOperand(0).getFPImm()->getType()->isDoubleTy()) {
569 OS << APF.convertToDouble();
571 // There is no good way to print long double. Convert a copy to
572 // double. Ah well, it's only a comment.
574 APF.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven,
576 OS << "(long double) " << APF.convertToDouble();
578 } else if (MI->getOperand(0).isImm()) {
579 OS << MI->getOperand(0).getImm();
580 } else if (MI->getOperand(0).isCImm()) {
581 MI->getOperand(0).getCImm()->getValue().print(OS, false /*isSigned*/);
583 assert(MI->getOperand(0).isReg() && "Unknown operand type");
584 if (MI->getOperand(0).getReg() == 0) {
585 // Suppress offset, it is not meaningful here.
587 // NOTE: Want this comment at start of line, don't emit with AddComment.
588 AP.OutStreamer.EmitRawText(OS.str());
591 OS << AP.TM.getRegisterInfo()->getName(MI->getOperand(0).getReg());
594 OS << '+' << MI->getOperand(1).getImm();
595 // NOTE: Want this comment at start of line, don't emit with AddComment.
596 AP.OutStreamer.EmitRawText(OS.str());
600 AsmPrinter::CFIMoveType AsmPrinter::needsCFIMoves() {
601 if (MAI->getExceptionHandlingType() == ExceptionHandling::DwarfCFI &&
602 MF->getFunction()->needsUnwindTableEntry())
605 if (MMI->hasDebugInfo())
611 bool AsmPrinter::needsSEHMoves() {
612 return MAI->getExceptionHandlingType() == ExceptionHandling::Win64 &&
613 MF->getFunction()->needsUnwindTableEntry();
616 bool AsmPrinter::needsRelocationsForDwarfStringPool() const {
617 return MAI->doesDwarfUseRelocationsForStringPool();
620 void AsmPrinter::emitPrologLabel(const MachineInstr &MI) {
621 MCSymbol *Label = MI.getOperand(0).getMCSymbol();
623 if (MAI->getExceptionHandlingType() != ExceptionHandling::DwarfCFI)
626 if (needsCFIMoves() == CFI_M_None)
629 if (MMI->getCompactUnwindEncoding() != 0)
630 OutStreamer.EmitCompactUnwindEncoding(MMI->getCompactUnwindEncoding());
632 MachineModuleInfo &MMI = MF->getMMI();
633 std::vector<MachineMove> &Moves = MMI.getFrameMoves();
634 bool FoundOne = false;
636 for (std::vector<MachineMove>::iterator I = Moves.begin(),
637 E = Moves.end(); I != E; ++I) {
638 if (I->getLabel() == Label) {
639 EmitCFIFrameMove(*I);
646 /// EmitFunctionBody - This method emits the body and trailer for a
648 void AsmPrinter::EmitFunctionBody() {
649 // Emit target-specific gunk before the function body.
650 EmitFunctionBodyStart();
652 bool ShouldPrintDebugScopes = DD && MMI->hasDebugInfo();
654 // Print out code for the function.
655 bool HasAnyRealCode = false;
656 const MachineInstr *LastMI = 0;
657 for (MachineFunction::const_iterator I = MF->begin(), E = MF->end();
659 // Print a label for the basic block.
660 EmitBasicBlockStart(I);
661 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
665 // Print the assembly for the instruction.
666 if (!II->isLabel() && !II->isImplicitDef() && !II->isKill() &&
667 !II->isDebugValue()) {
668 HasAnyRealCode = true;
672 if (ShouldPrintDebugScopes) {
673 NamedRegionTimer T(DbgTimerName, DWARFGroupName, TimePassesIsEnabled);
674 DD->beginInstruction(II);
678 EmitComments(*II, OutStreamer.GetCommentOS());
680 switch (II->getOpcode()) {
681 case TargetOpcode::PROLOG_LABEL:
682 emitPrologLabel(*II);
685 case TargetOpcode::EH_LABEL:
686 case TargetOpcode::GC_LABEL:
687 OutStreamer.EmitLabel(II->getOperand(0).getMCSymbol());
689 case TargetOpcode::INLINEASM:
692 case TargetOpcode::DBG_VALUE:
694 if (!EmitDebugValueComment(II, *this))
698 case TargetOpcode::IMPLICIT_DEF:
699 if (isVerbose()) EmitImplicitDef(II, *this);
701 case TargetOpcode::KILL:
702 if (isVerbose()) EmitKill(II, *this);
705 if (!TM.hasMCUseLoc())
706 MCLineEntry::Make(&OutStreamer, getCurrentSection());
712 if (ShouldPrintDebugScopes) {
713 NamedRegionTimer T(DbgTimerName, DWARFGroupName, TimePassesIsEnabled);
714 DD->endInstruction(II);
719 // If the last instruction was a prolog label, then we have a situation where
720 // we emitted a prolog but no function body. This results in the ending prolog
721 // label equaling the end of function label and an invalid "row" in the
722 // FDE. We need to emit a noop in this situation so that the FDE's rows are
724 bool RequiresNoop = LastMI && LastMI->isPrologLabel();
726 // If the function is empty and the object file uses .subsections_via_symbols,
727 // then we need to emit *something* to the function body to prevent the
728 // labels from collapsing together. Just emit a noop.
729 if ((MAI->hasSubsectionsViaSymbols() && !HasAnyRealCode) || RequiresNoop) {
731 TM.getInstrInfo()->getNoopForMachoTarget(Noop);
732 if (Noop.getOpcode()) {
733 OutStreamer.AddComment("avoids zero-length function");
734 OutStreamer.EmitInstruction(Noop);
735 } else // Target not mc-ized yet.
736 OutStreamer.EmitRawText(StringRef("\tnop\n"));
739 // Emit target-specific gunk after the function body.
740 EmitFunctionBodyEnd();
742 // If the target wants a .size directive for the size of the function, emit
744 if (MAI->hasDotTypeDotSizeDirective()) {
745 // Create a symbol for the end of function, so we can get the size as
746 // difference between the function label and the temp label.
747 MCSymbol *FnEndLabel = OutContext.CreateTempSymbol();
748 OutStreamer.EmitLabel(FnEndLabel);
750 const MCExpr *SizeExp =
751 MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(FnEndLabel, OutContext),
752 MCSymbolRefExpr::Create(CurrentFnSym, OutContext),
754 OutStreamer.EmitELFSize(CurrentFnSym, SizeExp);
757 // Emit post-function debug information.
759 NamedRegionTimer T(DbgTimerName, DWARFGroupName, TimePassesIsEnabled);
763 NamedRegionTimer T(EHTimerName, DWARFGroupName, TimePassesIsEnabled);
768 // Print out jump tables referenced by the function.
771 OutStreamer.AddBlankLine();
774 /// getDebugValueLocation - Get location information encoded by DBG_VALUE
776 MachineLocation AsmPrinter::
777 getDebugValueLocation(const MachineInstr *MI) const {
778 // Target specific DBG_VALUE instructions are handled by each target.
779 return MachineLocation();
782 /// EmitDwarfRegOp - Emit dwarf register operation.
783 void AsmPrinter::EmitDwarfRegOp(const MachineLocation &MLoc) const {
784 const TargetRegisterInfo *TRI = TM.getRegisterInfo();
785 int Reg = TRI->getDwarfRegNum(MLoc.getReg(), false);
787 for (const unsigned *SR = TRI->getSuperRegisters(MLoc.getReg());
788 *SR && Reg < 0; ++SR) {
789 Reg = TRI->getDwarfRegNum(*SR, false);
790 // FIXME: Get the bit range this register uses of the superregister
791 // so that we can produce a DW_OP_bit_piece
794 // FIXME: Handle cases like a super register being encoded as
795 // DW_OP_reg 32 DW_OP_piece 4 DW_OP_reg 33
797 // FIXME: We have no reasonable way of handling errors in here. The
798 // caller might be in the middle of an dwarf expression. We should
799 // probably assert that Reg >= 0 once debug info generation is more mature.
801 if (int Offset = MLoc.getOffset()) {
803 OutStreamer.AddComment(
804 dwarf::OperationEncodingString(dwarf::DW_OP_breg0 + Reg));
805 EmitInt8(dwarf::DW_OP_breg0 + Reg);
807 OutStreamer.AddComment("DW_OP_bregx");
808 EmitInt8(dwarf::DW_OP_bregx);
809 OutStreamer.AddComment(Twine(Reg));
815 OutStreamer.AddComment(
816 dwarf::OperationEncodingString(dwarf::DW_OP_reg0 + Reg));
817 EmitInt8(dwarf::DW_OP_reg0 + Reg);
819 OutStreamer.AddComment("DW_OP_regx");
820 EmitInt8(dwarf::DW_OP_regx);
821 OutStreamer.AddComment(Twine(Reg));
826 // FIXME: Produce a DW_OP_bit_piece if we used a superregister
829 bool AsmPrinter::doFinalization(Module &M) {
830 // Emit global variables.
831 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
833 EmitGlobalVariable(I);
835 // Emit visibility info for declarations
836 for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I) {
837 const Function &F = *I;
838 if (!F.isDeclaration())
840 GlobalValue::VisibilityTypes V = F.getVisibility();
841 if (V == GlobalValue::DefaultVisibility)
844 MCSymbol *Name = Mang->getSymbol(&F);
845 EmitVisibility(Name, V, false);
848 // Finalize debug and EH information.
851 NamedRegionTimer T(EHTimerName, DWARFGroupName, TimePassesIsEnabled);
858 NamedRegionTimer T(DbgTimerName, DWARFGroupName, TimePassesIsEnabled);
864 // If the target wants to know about weak references, print them all.
865 if (MAI->getWeakRefDirective()) {
866 // FIXME: This is not lazy, it would be nice to only print weak references
867 // to stuff that is actually used. Note that doing so would require targets
868 // to notice uses in operands (due to constant exprs etc). This should
869 // happen with the MC stuff eventually.
871 // Print out module-level global variables here.
872 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
874 if (!I->hasExternalWeakLinkage()) continue;
875 OutStreamer.EmitSymbolAttribute(Mang->getSymbol(I), MCSA_WeakReference);
878 for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I) {
879 if (!I->hasExternalWeakLinkage()) continue;
880 OutStreamer.EmitSymbolAttribute(Mang->getSymbol(I), MCSA_WeakReference);
884 if (MAI->hasSetDirective()) {
885 OutStreamer.AddBlankLine();
886 for (Module::const_alias_iterator I = M.alias_begin(), E = M.alias_end();
888 MCSymbol *Name = Mang->getSymbol(I);
890 const GlobalValue *GV = I->getAliasedGlobal();
891 MCSymbol *Target = Mang->getSymbol(GV);
893 if (I->hasExternalLinkage() || !MAI->getWeakRefDirective())
894 OutStreamer.EmitSymbolAttribute(Name, MCSA_Global);
895 else if (I->hasWeakLinkage())
896 OutStreamer.EmitSymbolAttribute(Name, MCSA_WeakReference);
898 assert(I->hasLocalLinkage() && "Invalid alias linkage");
900 EmitVisibility(Name, I->getVisibility());
902 // Emit the directives as assignments aka .set:
903 OutStreamer.EmitAssignment(Name,
904 MCSymbolRefExpr::Create(Target, OutContext));
908 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
909 assert(MI && "AsmPrinter didn't require GCModuleInfo?");
910 for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; )
911 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*--I))
912 MP->finishAssembly(*this);
914 // If we don't have any trampolines, then we don't require stack memory
915 // to be executable. Some targets have a directive to declare this.
916 Function *InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline");
917 if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty())
918 if (const MCSection *S = MAI->getNonexecutableStackSection(OutContext))
919 OutStreamer.SwitchSection(S);
921 // Allow the target to emit any magic that it wants at the end of the file,
922 // after everything else has gone out.
925 delete Mang; Mang = 0;
928 OutStreamer.Finish();
932 void AsmPrinter::SetupMachineFunction(MachineFunction &MF) {
934 // Get the function symbol.
935 CurrentFnSym = Mang->getSymbol(MF.getFunction());
938 LI = &getAnalysis<MachineLoopInfo>();
942 // SectionCPs - Keep track the alignment, constpool entries per Section.
946 SmallVector<unsigned, 4> CPEs;
947 SectionCPs(const MCSection *s, unsigned a) : S(s), Alignment(a) {}
951 /// EmitConstantPool - Print to the current output stream assembly
952 /// representations of the constants in the constant pool MCP. This is
953 /// used to print out constants which have been "spilled to memory" by
954 /// the code generator.
956 void AsmPrinter::EmitConstantPool() {
957 const MachineConstantPool *MCP = MF->getConstantPool();
958 const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
959 if (CP.empty()) return;
961 // Calculate sections for constant pool entries. We collect entries to go into
962 // the same section together to reduce amount of section switch statements.
963 SmallVector<SectionCPs, 4> CPSections;
964 for (unsigned i = 0, e = CP.size(); i != e; ++i) {
965 const MachineConstantPoolEntry &CPE = CP[i];
966 unsigned Align = CPE.getAlignment();
969 switch (CPE.getRelocationInfo()) {
970 default: llvm_unreachable("Unknown section kind");
971 case 2: Kind = SectionKind::getReadOnlyWithRel(); break;
973 Kind = SectionKind::getReadOnlyWithRelLocal();
976 switch (TM.getTargetData()->getTypeAllocSize(CPE.getType())) {
977 case 4: Kind = SectionKind::getMergeableConst4(); break;
978 case 8: Kind = SectionKind::getMergeableConst8(); break;
979 case 16: Kind = SectionKind::getMergeableConst16();break;
980 default: Kind = SectionKind::getMergeableConst(); break;
984 const MCSection *S = getObjFileLowering().getSectionForConstant(Kind);
986 // The number of sections are small, just do a linear search from the
987 // last section to the first.
989 unsigned SecIdx = CPSections.size();
990 while (SecIdx != 0) {
991 if (CPSections[--SecIdx].S == S) {
997 SecIdx = CPSections.size();
998 CPSections.push_back(SectionCPs(S, Align));
1001 if (Align > CPSections[SecIdx].Alignment)
1002 CPSections[SecIdx].Alignment = Align;
1003 CPSections[SecIdx].CPEs.push_back(i);
1006 // Now print stuff into the calculated sections.
1007 for (unsigned i = 0, e = CPSections.size(); i != e; ++i) {
1008 OutStreamer.SwitchSection(CPSections[i].S);
1009 EmitAlignment(Log2_32(CPSections[i].Alignment));
1011 unsigned Offset = 0;
1012 for (unsigned j = 0, ee = CPSections[i].CPEs.size(); j != ee; ++j) {
1013 unsigned CPI = CPSections[i].CPEs[j];
1014 MachineConstantPoolEntry CPE = CP[CPI];
1016 // Emit inter-object padding for alignment.
1017 unsigned AlignMask = CPE.getAlignment() - 1;
1018 unsigned NewOffset = (Offset + AlignMask) & ~AlignMask;
1019 OutStreamer.EmitFill(NewOffset - Offset, 0/*fillval*/, 0/*addrspace*/);
1021 Type *Ty = CPE.getType();
1022 Offset = NewOffset + TM.getTargetData()->getTypeAllocSize(Ty);
1023 OutStreamer.EmitLabel(GetCPISymbol(CPI));
1025 if (CPE.isMachineConstantPoolEntry())
1026 EmitMachineConstantPoolValue(CPE.Val.MachineCPVal);
1028 EmitGlobalConstant(CPE.Val.ConstVal);
1033 /// EmitJumpTableInfo - Print assembly representations of the jump tables used
1034 /// by the current function to the current output stream.
1036 void AsmPrinter::EmitJumpTableInfo() {
1037 const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo();
1038 if (MJTI == 0) return;
1039 if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_Inline) return;
1040 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
1041 if (JT.empty()) return;
1043 // Pick the directive to use to print the jump table entries, and switch to
1044 // the appropriate section.
1045 const Function *F = MF->getFunction();
1046 bool JTInDiffSection = false;
1047 if (// In PIC mode, we need to emit the jump table to the same section as the
1048 // function body itself, otherwise the label differences won't make sense.
1049 // FIXME: Need a better predicate for this: what about custom entries?
1050 MJTI->getEntryKind() == MachineJumpTableInfo::EK_LabelDifference32 ||
1051 // We should also do if the section name is NULL or function is declared
1052 // in discardable section
1053 // FIXME: this isn't the right predicate, should be based on the MCSection
1054 // for the function.
1055 F->isWeakForLinker()) {
1056 OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F,Mang,TM));
1058 // Otherwise, drop it in the readonly section.
1059 const MCSection *ReadOnlySection =
1060 getObjFileLowering().getSectionForConstant(SectionKind::getReadOnly());
1061 OutStreamer.SwitchSection(ReadOnlySection);
1062 JTInDiffSection = true;
1065 EmitAlignment(Log2_32(MJTI->getEntryAlignment(*TM.getTargetData())));
1067 // If we know the form of the jump table, go ahead and tag it as such.
1068 if (!JTInDiffSection) {
1069 if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_LabelDifference32) {
1070 OutStreamer.EmitJumpTable32Region();
1072 OutStreamer.EmitDataRegion();
1076 for (unsigned JTI = 0, e = JT.size(); JTI != e; ++JTI) {
1077 const std::vector<MachineBasicBlock*> &JTBBs = JT[JTI].MBBs;
1079 // If this jump table was deleted, ignore it.
1080 if (JTBBs.empty()) continue;
1082 // For the EK_LabelDifference32 entry, if the target supports .set, emit a
1083 // .set directive for each unique entry. This reduces the number of
1084 // relocations the assembler will generate for the jump table.
1085 if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_LabelDifference32 &&
1086 MAI->hasSetDirective()) {
1087 SmallPtrSet<const MachineBasicBlock*, 16> EmittedSets;
1088 const TargetLowering *TLI = TM.getTargetLowering();
1089 const MCExpr *Base = TLI->getPICJumpTableRelocBaseExpr(MF,JTI,OutContext);
1090 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
1091 const MachineBasicBlock *MBB = JTBBs[ii];
1092 if (!EmittedSets.insert(MBB)) continue;
1094 // .set LJTSet, LBB32-base
1096 MCSymbolRefExpr::Create(MBB->getSymbol(), OutContext);
1097 OutStreamer.EmitAssignment(GetJTSetSymbol(JTI, MBB->getNumber()),
1098 MCBinaryExpr::CreateSub(LHS, Base, OutContext));
1102 // On some targets (e.g. Darwin) we want to emit two consecutive labels
1103 // before each jump table. The first label is never referenced, but tells
1104 // the assembler and linker the extents of the jump table object. The
1105 // second label is actually referenced by the code.
1106 if (JTInDiffSection && MAI->getLinkerPrivateGlobalPrefix()[0])
1107 // FIXME: This doesn't have to have any specific name, just any randomly
1108 // named and numbered 'l' label would work. Simplify GetJTISymbol.
1109 OutStreamer.EmitLabel(GetJTISymbol(JTI, true));
1111 OutStreamer.EmitLabel(GetJTISymbol(JTI));
1113 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
1114 EmitJumpTableEntry(MJTI, JTBBs[ii], JTI);
1118 /// EmitJumpTableEntry - Emit a jump table entry for the specified MBB to the
1120 void AsmPrinter::EmitJumpTableEntry(const MachineJumpTableInfo *MJTI,
1121 const MachineBasicBlock *MBB,
1122 unsigned UID) const {
1123 assert(MBB && MBB->getNumber() >= 0 && "Invalid basic block");
1124 const MCExpr *Value = 0;
1125 switch (MJTI->getEntryKind()) {
1126 case MachineJumpTableInfo::EK_Inline:
1127 llvm_unreachable("Cannot emit EK_Inline jump table entry"); break;
1128 case MachineJumpTableInfo::EK_Custom32:
1129 Value = TM.getTargetLowering()->LowerCustomJumpTableEntry(MJTI, MBB, UID,
1132 case MachineJumpTableInfo::EK_BlockAddress:
1133 // EK_BlockAddress - Each entry is a plain address of block, e.g.:
1135 Value = MCSymbolRefExpr::Create(MBB->getSymbol(), OutContext);
1137 case MachineJumpTableInfo::EK_GPRel32BlockAddress: {
1138 // EK_GPRel32BlockAddress - Each entry is an address of block, encoded
1139 // with a relocation as gp-relative, e.g.:
1141 MCSymbol *MBBSym = MBB->getSymbol();
1142 OutStreamer.EmitGPRel32Value(MCSymbolRefExpr::Create(MBBSym, OutContext));
1146 case MachineJumpTableInfo::EK_LabelDifference32: {
1147 // EK_LabelDifference32 - Each entry is the address of the block minus
1148 // the address of the jump table. This is used for PIC jump tables where
1149 // gprel32 is not supported. e.g.:
1150 // .word LBB123 - LJTI1_2
1151 // If the .set directive is supported, this is emitted as:
1152 // .set L4_5_set_123, LBB123 - LJTI1_2
1153 // .word L4_5_set_123
1155 // If we have emitted set directives for the jump table entries, print
1156 // them rather than the entries themselves. If we're emitting PIC, then
1157 // emit the table entries as differences between two text section labels.
1158 if (MAI->hasSetDirective()) {
1159 // If we used .set, reference the .set's symbol.
1160 Value = MCSymbolRefExpr::Create(GetJTSetSymbol(UID, MBB->getNumber()),
1164 // Otherwise, use the difference as the jump table entry.
1165 Value = MCSymbolRefExpr::Create(MBB->getSymbol(), OutContext);
1166 const MCExpr *JTI = MCSymbolRefExpr::Create(GetJTISymbol(UID), OutContext);
1167 Value = MCBinaryExpr::CreateSub(Value, JTI, OutContext);
1172 assert(Value && "Unknown entry kind!");
1174 unsigned EntrySize = MJTI->getEntrySize(*TM.getTargetData());
1175 OutStreamer.EmitValue(Value, EntrySize, /*addrspace*/0);
1179 /// EmitSpecialLLVMGlobal - Check to see if the specified global is a
1180 /// special global used by LLVM. If so, emit it and return true, otherwise
1181 /// do nothing and return false.
1182 bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
1183 if (GV->getName() == "llvm.used") {
1184 if (MAI->hasNoDeadStrip()) // No need to emit this at all.
1185 EmitLLVMUsedList(GV->getInitializer());
1189 // Ignore debug and non-emitted data. This handles llvm.compiler.used.
1190 if (GV->getSection() == "llvm.metadata" ||
1191 GV->hasAvailableExternallyLinkage())
1194 if (!GV->hasAppendingLinkage()) return false;
1196 assert(GV->hasInitializer() && "Not a special LLVM global!");
1198 const TargetData *TD = TM.getTargetData();
1199 unsigned Align = Log2_32(TD->getPointerPrefAlignment());
1200 if (GV->getName() == "llvm.global_ctors") {
1201 OutStreamer.SwitchSection(getObjFileLowering().getStaticCtorSection());
1202 EmitAlignment(Align);
1203 EmitXXStructorList(GV->getInitializer());
1205 if (TM.getRelocationModel() == Reloc::Static &&
1206 MAI->hasStaticCtorDtorReferenceInStaticMode()) {
1207 StringRef Sym(".constructors_used");
1208 OutStreamer.EmitSymbolAttribute(OutContext.GetOrCreateSymbol(Sym),
1214 if (GV->getName() == "llvm.global_dtors") {
1215 OutStreamer.SwitchSection(getObjFileLowering().getStaticDtorSection());
1216 EmitAlignment(Align);
1217 EmitXXStructorList(GV->getInitializer());
1219 if (TM.getRelocationModel() == Reloc::Static &&
1220 MAI->hasStaticCtorDtorReferenceInStaticMode()) {
1221 StringRef Sym(".destructors_used");
1222 OutStreamer.EmitSymbolAttribute(OutContext.GetOrCreateSymbol(Sym),
1231 /// EmitLLVMUsedList - For targets that define a MAI::UsedDirective, mark each
1232 /// global in the specified llvm.used list for which emitUsedDirectiveFor
1233 /// is true, as being used with this directive.
1234 void AsmPrinter::EmitLLVMUsedList(const Constant *List) {
1235 // Should be an array of 'i8*'.
1236 const ConstantArray *InitList = dyn_cast<ConstantArray>(List);
1237 if (InitList == 0) return;
1239 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
1240 const GlobalValue *GV =
1241 dyn_cast<GlobalValue>(InitList->getOperand(i)->stripPointerCasts());
1242 if (GV && getObjFileLowering().shouldEmitUsedDirectiveFor(GV, Mang))
1243 OutStreamer.EmitSymbolAttribute(Mang->getSymbol(GV), MCSA_NoDeadStrip);
1247 typedef std::pair<int, Constant*> Structor;
1249 static bool priority_order(const Structor& lhs, const Structor& rhs) {
1250 return lhs.first < rhs.first;
1253 /// EmitXXStructorList - Emit the ctor or dtor list taking into account the init
1255 void AsmPrinter::EmitXXStructorList(const Constant *List) {
1256 // Should be an array of '{ int, void ()* }' structs. The first value is the
1258 if (!isa<ConstantArray>(List)) return;
1260 // Sanity check the structors list.
1261 const ConstantArray *InitList = dyn_cast<ConstantArray>(List);
1262 if (!InitList) return; // Not an array!
1263 StructType *ETy = dyn_cast<StructType>(InitList->getType()->getElementType());
1264 if (!ETy || ETy->getNumElements() != 2) return; // Not an array of pairs!
1265 if (!isa<IntegerType>(ETy->getTypeAtIndex(0U)) ||
1266 !isa<PointerType>(ETy->getTypeAtIndex(1U))) return; // Not (int, ptr).
1268 // Gather the structors in a form that's convenient for sorting by priority.
1269 SmallVector<Structor, 8> Structors;
1270 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
1271 ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i));
1272 if (!CS) continue; // Malformed.
1273 if (CS->getOperand(1)->isNullValue())
1274 break; // Found a null terminator, skip the rest.
1275 ConstantInt *Priority = dyn_cast<ConstantInt>(CS->getOperand(0));
1276 if (!Priority) continue; // Malformed.
1277 Structors.push_back(std::make_pair(Priority->getLimitedValue(65535),
1278 CS->getOperand(1)));
1281 // Emit the function pointers in reverse priority order.
1282 switch (MAI->getStructorOutputOrder()) {
1283 case Structors::None:
1285 case Structors::PriorityOrder:
1286 std::sort(Structors.begin(), Structors.end(), priority_order);
1288 case Structors::ReversePriorityOrder:
1289 std::sort(Structors.rbegin(), Structors.rend(), priority_order);
1292 for (unsigned i = 0, e = Structors.size(); i != e; ++i)
1293 EmitGlobalConstant(Structors[i].second);
1296 //===--------------------------------------------------------------------===//
1297 // Emission and print routines
1300 /// EmitInt8 - Emit a byte directive and value.
1302 void AsmPrinter::EmitInt8(int Value) const {
1303 OutStreamer.EmitIntValue(Value, 1, 0/*addrspace*/);
1306 /// EmitInt16 - Emit a short directive and value.
1308 void AsmPrinter::EmitInt16(int Value) const {
1309 OutStreamer.EmitIntValue(Value, 2, 0/*addrspace*/);
1312 /// EmitInt32 - Emit a long directive and value.
1314 void AsmPrinter::EmitInt32(int Value) const {
1315 OutStreamer.EmitIntValue(Value, 4, 0/*addrspace*/);
1318 /// EmitLabelDifference - Emit something like ".long Hi-Lo" where the size
1319 /// in bytes of the directive is specified by Size and Hi/Lo specify the
1320 /// labels. This implicitly uses .set if it is available.
1321 void AsmPrinter::EmitLabelDifference(const MCSymbol *Hi, const MCSymbol *Lo,
1322 unsigned Size) const {
1323 // Get the Hi-Lo expression.
1324 const MCExpr *Diff =
1325 MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(Hi, OutContext),
1326 MCSymbolRefExpr::Create(Lo, OutContext),
1329 if (!MAI->hasSetDirective()) {
1330 OutStreamer.EmitValue(Diff, Size, 0/*AddrSpace*/);
1334 // Otherwise, emit with .set (aka assignment).
1335 MCSymbol *SetLabel = GetTempSymbol("set", SetCounter++);
1336 OutStreamer.EmitAssignment(SetLabel, Diff);
1337 OutStreamer.EmitSymbolValue(SetLabel, Size, 0/*AddrSpace*/);
1340 /// EmitLabelOffsetDifference - Emit something like ".long Hi+Offset-Lo"
1341 /// where the size in bytes of the directive is specified by Size and Hi/Lo
1342 /// specify the labels. This implicitly uses .set if it is available.
1343 void AsmPrinter::EmitLabelOffsetDifference(const MCSymbol *Hi, uint64_t Offset,
1344 const MCSymbol *Lo, unsigned Size)
1347 // Emit Hi+Offset - Lo
1348 // Get the Hi+Offset expression.
1349 const MCExpr *Plus =
1350 MCBinaryExpr::CreateAdd(MCSymbolRefExpr::Create(Hi, OutContext),
1351 MCConstantExpr::Create(Offset, OutContext),
1354 // Get the Hi+Offset-Lo expression.
1355 const MCExpr *Diff =
1356 MCBinaryExpr::CreateSub(Plus,
1357 MCSymbolRefExpr::Create(Lo, OutContext),
1360 if (!MAI->hasSetDirective())
1361 OutStreamer.EmitValue(Diff, 4, 0/*AddrSpace*/);
1363 // Otherwise, emit with .set (aka assignment).
1364 MCSymbol *SetLabel = GetTempSymbol("set", SetCounter++);
1365 OutStreamer.EmitAssignment(SetLabel, Diff);
1366 OutStreamer.EmitSymbolValue(SetLabel, 4, 0/*AddrSpace*/);
1370 /// EmitLabelPlusOffset - Emit something like ".long Label+Offset"
1371 /// where the size in bytes of the directive is specified by Size and Label
1372 /// specifies the label. This implicitly uses .set if it is available.
1373 void AsmPrinter::EmitLabelPlusOffset(const MCSymbol *Label, uint64_t Offset,
1377 // Emit Label+Offset
1378 const MCExpr *Plus =
1379 MCBinaryExpr::CreateAdd(MCSymbolRefExpr::Create(Label, OutContext),
1380 MCConstantExpr::Create(Offset, OutContext),
1383 OutStreamer.EmitValue(Plus, 4, 0/*AddrSpace*/);
1387 //===----------------------------------------------------------------------===//
1389 // EmitAlignment - Emit an alignment directive to the specified power of
1390 // two boundary. For example, if you pass in 3 here, you will get an 8
1391 // byte alignment. If a global value is specified, and if that global has
1392 // an explicit alignment requested, it will override the alignment request
1393 // if required for correctness.
1395 void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV) const {
1396 if (GV) NumBits = getGVAlignmentLog2(GV, *TM.getTargetData(), NumBits);
1398 if (NumBits == 0) return; // 1-byte aligned: no need to emit alignment.
1400 if (getCurrentSection()->getKind().isText())
1401 OutStreamer.EmitCodeAlignment(1 << NumBits);
1403 OutStreamer.EmitValueToAlignment(1 << NumBits, 0, 1, 0);
1406 //===----------------------------------------------------------------------===//
1407 // Constant emission.
1408 //===----------------------------------------------------------------------===//
1410 /// LowerConstant - Lower the specified LLVM Constant to an MCExpr.
1412 static const MCExpr *LowerConstant(const Constant *CV, AsmPrinter &AP) {
1413 MCContext &Ctx = AP.OutContext;
1415 if (CV->isNullValue() || isa<UndefValue>(CV))
1416 return MCConstantExpr::Create(0, Ctx);
1418 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV))
1419 return MCConstantExpr::Create(CI->getZExtValue(), Ctx);
1421 if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV))
1422 return MCSymbolRefExpr::Create(AP.Mang->getSymbol(GV), Ctx);
1424 if (const BlockAddress *BA = dyn_cast<BlockAddress>(CV))
1425 return MCSymbolRefExpr::Create(AP.GetBlockAddressSymbol(BA), Ctx);
1427 const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV);
1429 llvm_unreachable("Unknown constant value to lower!");
1430 return MCConstantExpr::Create(0, Ctx);
1433 switch (CE->getOpcode()) {
1435 // If the code isn't optimized, there may be outstanding folding
1436 // opportunities. Attempt to fold the expression using TargetData as a
1437 // last resort before giving up.
1439 ConstantFoldConstantExpression(CE, AP.TM.getTargetData()))
1441 return LowerConstant(C, AP);
1443 // Otherwise report the problem to the user.
1446 raw_string_ostream OS(S);
1447 OS << "Unsupported expression in static initializer: ";
1448 WriteAsOperand(OS, CE, /*PrintType=*/false,
1449 !AP.MF ? 0 : AP.MF->getFunction()->getParent());
1450 report_fatal_error(OS.str());
1452 return MCConstantExpr::Create(0, Ctx);
1453 case Instruction::GetElementPtr: {
1454 const TargetData &TD = *AP.TM.getTargetData();
1455 // Generate a symbolic expression for the byte address
1456 const Constant *PtrVal = CE->getOperand(0);
1457 SmallVector<Value*, 8> IdxVec(CE->op_begin()+1, CE->op_end());
1458 int64_t Offset = TD.getIndexedOffset(PtrVal->getType(), IdxVec);
1460 const MCExpr *Base = LowerConstant(CE->getOperand(0), AP);
1464 // Truncate/sext the offset to the pointer size.
1465 if (TD.getPointerSizeInBits() != 64) {
1466 int SExtAmount = 64-TD.getPointerSizeInBits();
1467 Offset = (Offset << SExtAmount) >> SExtAmount;
1470 return MCBinaryExpr::CreateAdd(Base, MCConstantExpr::Create(Offset, Ctx),
1474 case Instruction::Trunc:
1475 // We emit the value and depend on the assembler to truncate the generated
1476 // expression properly. This is important for differences between
1477 // blockaddress labels. Since the two labels are in the same function, it
1478 // is reasonable to treat their delta as a 32-bit value.
1480 case Instruction::BitCast:
1481 return LowerConstant(CE->getOperand(0), AP);
1483 case Instruction::IntToPtr: {
1484 const TargetData &TD = *AP.TM.getTargetData();
1485 // Handle casts to pointers by changing them into casts to the appropriate
1486 // integer type. This promotes constant folding and simplifies this code.
1487 Constant *Op = CE->getOperand(0);
1488 Op = ConstantExpr::getIntegerCast(Op, TD.getIntPtrType(CV->getContext()),
1490 return LowerConstant(Op, AP);
1493 case Instruction::PtrToInt: {
1494 const TargetData &TD = *AP.TM.getTargetData();
1495 // Support only foldable casts to/from pointers that can be eliminated by
1496 // changing the pointer to the appropriately sized integer type.
1497 Constant *Op = CE->getOperand(0);
1498 Type *Ty = CE->getType();
1500 const MCExpr *OpExpr = LowerConstant(Op, AP);
1502 // We can emit the pointer value into this slot if the slot is an
1503 // integer slot equal to the size of the pointer.
1504 if (TD.getTypeAllocSize(Ty) == TD.getTypeAllocSize(Op->getType()))
1507 // Otherwise the pointer is smaller than the resultant integer, mask off
1508 // the high bits so we are sure to get a proper truncation if the input is
1510 unsigned InBits = TD.getTypeAllocSizeInBits(Op->getType());
1511 const MCExpr *MaskExpr = MCConstantExpr::Create(~0ULL >> (64-InBits), Ctx);
1512 return MCBinaryExpr::CreateAnd(OpExpr, MaskExpr, Ctx);
1515 // The MC library also has a right-shift operator, but it isn't consistently
1516 // signed or unsigned between different targets.
1517 case Instruction::Add:
1518 case Instruction::Sub:
1519 case Instruction::Mul:
1520 case Instruction::SDiv:
1521 case Instruction::SRem:
1522 case Instruction::Shl:
1523 case Instruction::And:
1524 case Instruction::Or:
1525 case Instruction::Xor: {
1526 const MCExpr *LHS = LowerConstant(CE->getOperand(0), AP);
1527 const MCExpr *RHS = LowerConstant(CE->getOperand(1), AP);
1528 switch (CE->getOpcode()) {
1529 default: llvm_unreachable("Unknown binary operator constant cast expr");
1530 case Instruction::Add: return MCBinaryExpr::CreateAdd(LHS, RHS, Ctx);
1531 case Instruction::Sub: return MCBinaryExpr::CreateSub(LHS, RHS, Ctx);
1532 case Instruction::Mul: return MCBinaryExpr::CreateMul(LHS, RHS, Ctx);
1533 case Instruction::SDiv: return MCBinaryExpr::CreateDiv(LHS, RHS, Ctx);
1534 case Instruction::SRem: return MCBinaryExpr::CreateMod(LHS, RHS, Ctx);
1535 case Instruction::Shl: return MCBinaryExpr::CreateShl(LHS, RHS, Ctx);
1536 case Instruction::And: return MCBinaryExpr::CreateAnd(LHS, RHS, Ctx);
1537 case Instruction::Or: return MCBinaryExpr::CreateOr (LHS, RHS, Ctx);
1538 case Instruction::Xor: return MCBinaryExpr::CreateXor(LHS, RHS, Ctx);
1544 static void EmitGlobalConstantImpl(const Constant *C, unsigned AddrSpace,
1547 /// isRepeatedByteSequence - Determine whether the given value is
1548 /// composed of a repeated sequence of identical bytes and return the
1549 /// byte value. If it is not a repeated sequence, return -1.
1550 static int isRepeatedByteSequence(const Value *V, TargetMachine &TM) {
1552 if (const ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
1553 if (CI->getBitWidth() > 64) return -1;
1555 uint64_t Size = TM.getTargetData()->getTypeAllocSize(V->getType());
1556 uint64_t Value = CI->getZExtValue();
1558 // Make sure the constant is at least 8 bits long and has a power
1559 // of 2 bit width. This guarantees the constant bit width is
1560 // always a multiple of 8 bits, avoiding issues with padding out
1561 // to Size and other such corner cases.
1562 if (CI->getBitWidth() < 8 || !isPowerOf2_64(CI->getBitWidth())) return -1;
1564 uint8_t Byte = static_cast<uint8_t>(Value);
1566 for (unsigned i = 1; i < Size; ++i) {
1568 if (static_cast<uint8_t>(Value) != Byte) return -1;
1572 if (const ConstantArray *CA = dyn_cast<ConstantArray>(V)) {
1573 // Make sure all array elements are sequences of the same repeated
1575 if (CA->getNumOperands() == 0) return -1;
1577 int Byte = isRepeatedByteSequence(CA->getOperand(0), TM);
1578 if (Byte == -1) return -1;
1580 for (unsigned i = 1, e = CA->getNumOperands(); i != e; ++i) {
1581 int ThisByte = isRepeatedByteSequence(CA->getOperand(i), TM);
1582 if (ThisByte == -1) return -1;
1583 if (Byte != ThisByte) return -1;
1591 static void EmitGlobalConstantArray(const ConstantArray *CA, unsigned AddrSpace,
1593 if (AddrSpace != 0 || !CA->isString()) {
1594 // Not a string. Print the values in successive locations.
1596 // See if we can aggregate some values. Make sure it can be
1597 // represented as a series of bytes of the constant value.
1598 int Value = isRepeatedByteSequence(CA, AP.TM);
1601 uint64_t Bytes = AP.TM.getTargetData()->getTypeAllocSize(CA->getType());
1602 AP.OutStreamer.EmitFill(Bytes, Value, AddrSpace);
1605 for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i)
1606 EmitGlobalConstantImpl(CA->getOperand(i), AddrSpace, AP);
1611 // Otherwise, it can be emitted as .ascii.
1612 SmallVector<char, 128> TmpVec;
1613 TmpVec.reserve(CA->getNumOperands());
1614 for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i)
1615 TmpVec.push_back(cast<ConstantInt>(CA->getOperand(i))->getZExtValue());
1617 AP.OutStreamer.EmitBytes(StringRef(TmpVec.data(), TmpVec.size()), AddrSpace);
1620 static void EmitGlobalConstantVector(const ConstantVector *CV,
1621 unsigned AddrSpace, AsmPrinter &AP) {
1622 for (unsigned i = 0, e = CV->getType()->getNumElements(); i != e; ++i)
1623 EmitGlobalConstantImpl(CV->getOperand(i), AddrSpace, AP);
1625 const TargetData &TD = *AP.TM.getTargetData();
1626 unsigned Size = TD.getTypeAllocSize(CV->getType());
1627 unsigned EmittedSize = TD.getTypeAllocSize(CV->getType()->getElementType()) *
1628 CV->getType()->getNumElements();
1629 if (unsigned Padding = Size - EmittedSize)
1630 AP.OutStreamer.EmitZeros(Padding, AddrSpace);
1633 static void EmitGlobalConstantStruct(const ConstantStruct *CS,
1634 unsigned AddrSpace, AsmPrinter &AP) {
1635 // Print the fields in successive locations. Pad to align if needed!
1636 const TargetData *TD = AP.TM.getTargetData();
1637 unsigned Size = TD->getTypeAllocSize(CS->getType());
1638 const StructLayout *Layout = TD->getStructLayout(CS->getType());
1639 uint64_t SizeSoFar = 0;
1640 for (unsigned i = 0, e = CS->getNumOperands(); i != e; ++i) {
1641 const Constant *Field = CS->getOperand(i);
1643 // Check if padding is needed and insert one or more 0s.
1644 uint64_t FieldSize = TD->getTypeAllocSize(Field->getType());
1645 uint64_t PadSize = ((i == e-1 ? Size : Layout->getElementOffset(i+1))
1646 - Layout->getElementOffset(i)) - FieldSize;
1647 SizeSoFar += FieldSize + PadSize;
1649 // Now print the actual field value.
1650 EmitGlobalConstantImpl(Field, AddrSpace, AP);
1652 // Insert padding - this may include padding to increase the size of the
1653 // current field up to the ABI size (if the struct is not packed) as well
1654 // as padding to ensure that the next field starts at the right offset.
1655 AP.OutStreamer.EmitZeros(PadSize, AddrSpace);
1657 assert(SizeSoFar == Layout->getSizeInBytes() &&
1658 "Layout of constant struct may be incorrect!");
1661 static void EmitGlobalConstantFP(const ConstantFP *CFP, unsigned AddrSpace,
1663 // FP Constants are printed as integer constants to avoid losing
1665 if (CFP->getType()->isDoubleTy()) {
1666 if (AP.isVerbose()) {
1667 double Val = CFP->getValueAPF().convertToDouble();
1668 AP.OutStreamer.GetCommentOS() << "double " << Val << '\n';
1671 uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1672 AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace);
1676 if (CFP->getType()->isFloatTy()) {
1677 if (AP.isVerbose()) {
1678 float Val = CFP->getValueAPF().convertToFloat();
1679 AP.OutStreamer.GetCommentOS() << "float " << Val << '\n';
1681 uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1682 AP.OutStreamer.EmitIntValue(Val, 4, AddrSpace);
1686 if (CFP->getType()->isX86_FP80Ty()) {
1687 // all long double variants are printed as hex
1688 // API needed to prevent premature destruction
1689 APInt API = CFP->getValueAPF().bitcastToAPInt();
1690 const uint64_t *p = API.getRawData();
1691 if (AP.isVerbose()) {
1692 // Convert to double so we can print the approximate val as a comment.
1693 APFloat DoubleVal = CFP->getValueAPF();
1695 DoubleVal.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven,
1697 AP.OutStreamer.GetCommentOS() << "x86_fp80 ~= "
1698 << DoubleVal.convertToDouble() << '\n';
1701 if (AP.TM.getTargetData()->isBigEndian()) {
1702 AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace);
1703 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1705 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1706 AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace);
1709 // Emit the tail padding for the long double.
1710 const TargetData &TD = *AP.TM.getTargetData();
1711 AP.OutStreamer.EmitZeros(TD.getTypeAllocSize(CFP->getType()) -
1712 TD.getTypeStoreSize(CFP->getType()), AddrSpace);
1716 assert(CFP->getType()->isPPC_FP128Ty() &&
1717 "Floating point constant type not handled");
1718 // All long double variants are printed as hex
1719 // API needed to prevent premature destruction.
1720 APInt API = CFP->getValueAPF().bitcastToAPInt();
1721 const uint64_t *p = API.getRawData();
1722 if (AP.TM.getTargetData()->isBigEndian()) {
1723 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1724 AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace);
1726 AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace);
1727 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1731 static void EmitGlobalConstantLargeInt(const ConstantInt *CI,
1732 unsigned AddrSpace, AsmPrinter &AP) {
1733 const TargetData *TD = AP.TM.getTargetData();
1734 unsigned BitWidth = CI->getBitWidth();
1735 assert((BitWidth & 63) == 0 && "only support multiples of 64-bits");
1737 // We don't expect assemblers to support integer data directives
1738 // for more than 64 bits, so we emit the data in at most 64-bit
1739 // quantities at a time.
1740 const uint64_t *RawData = CI->getValue().getRawData();
1741 for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) {
1742 uint64_t Val = TD->isBigEndian() ? RawData[e - i - 1] : RawData[i];
1743 AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace);
1747 static void EmitGlobalConstantImpl(const Constant *CV, unsigned AddrSpace,
1749 if (isa<ConstantAggregateZero>(CV) || isa<UndefValue>(CV)) {
1750 uint64_t Size = AP.TM.getTargetData()->getTypeAllocSize(CV->getType());
1751 return AP.OutStreamer.EmitZeros(Size, AddrSpace);
1754 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
1755 unsigned Size = AP.TM.getTargetData()->getTypeAllocSize(CV->getType());
1762 AP.OutStreamer.GetCommentOS() << format("0x%" PRIx64 "\n",
1763 CI->getZExtValue());
1764 AP.OutStreamer.EmitIntValue(CI->getZExtValue(), Size, AddrSpace);
1767 EmitGlobalConstantLargeInt(CI, AddrSpace, AP);
1772 if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV))
1773 return EmitGlobalConstantArray(CVA, AddrSpace, AP);
1775 if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV))
1776 return EmitGlobalConstantStruct(CVS, AddrSpace, AP);
1778 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV))
1779 return EmitGlobalConstantFP(CFP, AddrSpace, AP);
1781 if (isa<ConstantPointerNull>(CV)) {
1782 unsigned Size = AP.TM.getTargetData()->getTypeAllocSize(CV->getType());
1783 AP.OutStreamer.EmitIntValue(0, Size, AddrSpace);
1787 if (const ConstantVector *V = dyn_cast<ConstantVector>(CV))
1788 return EmitGlobalConstantVector(V, AddrSpace, AP);
1790 // Otherwise, it must be a ConstantExpr. Lower it to an MCExpr, then emit it
1791 // thread the streamer with EmitValue.
1792 AP.OutStreamer.EmitValue(LowerConstant(CV, AP),
1793 AP.TM.getTargetData()->getTypeAllocSize(CV->getType()),
1797 /// EmitGlobalConstant - Print a general LLVM constant to the .s file.
1798 void AsmPrinter::EmitGlobalConstant(const Constant *CV, unsigned AddrSpace) {
1799 uint64_t Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
1801 EmitGlobalConstantImpl(CV, AddrSpace, *this);
1802 else if (MAI->hasSubsectionsViaSymbols()) {
1803 // If the global has zero size, emit a single byte so that two labels don't
1804 // look like they are at the same location.
1805 OutStreamer.EmitIntValue(0, 1, AddrSpace);
1809 void AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
1810 // Target doesn't support this yet!
1811 llvm_unreachable("Target does not support EmitMachineConstantPoolValue");
1814 void AsmPrinter::printOffset(int64_t Offset, raw_ostream &OS) const {
1816 OS << '+' << Offset;
1817 else if (Offset < 0)
1821 //===----------------------------------------------------------------------===//
1822 // Symbol Lowering Routines.
1823 //===----------------------------------------------------------------------===//
1825 /// GetTempSymbol - Return the MCSymbol corresponding to the assembler
1826 /// temporary label with the specified stem and unique ID.
1827 MCSymbol *AsmPrinter::GetTempSymbol(StringRef Name, unsigned ID) const {
1828 return OutContext.GetOrCreateSymbol(Twine(MAI->getPrivateGlobalPrefix()) +
1832 /// GetTempSymbol - Return an assembler temporary label with the specified
1834 MCSymbol *AsmPrinter::GetTempSymbol(StringRef Name) const {
1835 return OutContext.GetOrCreateSymbol(Twine(MAI->getPrivateGlobalPrefix())+
1840 MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BlockAddress *BA) const {
1841 return MMI->getAddrLabelSymbol(BA->getBasicBlock());
1844 MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BasicBlock *BB) const {
1845 return MMI->getAddrLabelSymbol(BB);
1848 /// GetCPISymbol - Return the symbol for the specified constant pool entry.
1849 MCSymbol *AsmPrinter::GetCPISymbol(unsigned CPID) const {
1850 return OutContext.GetOrCreateSymbol
1851 (Twine(MAI->getPrivateGlobalPrefix()) + "CPI" + Twine(getFunctionNumber())
1852 + "_" + Twine(CPID));
1855 /// GetJTISymbol - Return the symbol for the specified jump table entry.
1856 MCSymbol *AsmPrinter::GetJTISymbol(unsigned JTID, bool isLinkerPrivate) const {
1857 return MF->getJTISymbol(JTID, OutContext, isLinkerPrivate);
1860 /// GetJTSetSymbol - Return the symbol for the specified jump table .set
1861 /// FIXME: privatize to AsmPrinter.
1862 MCSymbol *AsmPrinter::GetJTSetSymbol(unsigned UID, unsigned MBBID) const {
1863 return OutContext.GetOrCreateSymbol
1864 (Twine(MAI->getPrivateGlobalPrefix()) + Twine(getFunctionNumber()) + "_" +
1865 Twine(UID) + "_set_" + Twine(MBBID));
1868 /// GetSymbolWithGlobalValueBase - Return the MCSymbol for a symbol with
1869 /// global value name as its base, with the specified suffix, and where the
1870 /// symbol is forced to have private linkage if ForcePrivate is true.
1871 MCSymbol *AsmPrinter::GetSymbolWithGlobalValueBase(const GlobalValue *GV,
1873 bool ForcePrivate) const {
1874 SmallString<60> NameStr;
1875 Mang->getNameWithPrefix(NameStr, GV, ForcePrivate);
1876 NameStr.append(Suffix.begin(), Suffix.end());
1877 return OutContext.GetOrCreateSymbol(NameStr.str());
1880 /// GetExternalSymbolSymbol - Return the MCSymbol for the specified
1882 MCSymbol *AsmPrinter::GetExternalSymbolSymbol(StringRef Sym) const {
1883 SmallString<60> NameStr;
1884 Mang->getNameWithPrefix(NameStr, Sym);
1885 return OutContext.GetOrCreateSymbol(NameStr.str());
1890 /// PrintParentLoopComment - Print comments about parent loops of this one.
1891 static void PrintParentLoopComment(raw_ostream &OS, const MachineLoop *Loop,
1892 unsigned FunctionNumber) {
1893 if (Loop == 0) return;
1894 PrintParentLoopComment(OS, Loop->getParentLoop(), FunctionNumber);
1895 OS.indent(Loop->getLoopDepth()*2)
1896 << "Parent Loop BB" << FunctionNumber << "_"
1897 << Loop->getHeader()->getNumber()
1898 << " Depth=" << Loop->getLoopDepth() << '\n';
1902 /// PrintChildLoopComment - Print comments about child loops within
1903 /// the loop for this basic block, with nesting.
1904 static void PrintChildLoopComment(raw_ostream &OS, const MachineLoop *Loop,
1905 unsigned FunctionNumber) {
1906 // Add child loop information
1907 for (MachineLoop::iterator CL = Loop->begin(), E = Loop->end();CL != E; ++CL){
1908 OS.indent((*CL)->getLoopDepth()*2)
1909 << "Child Loop BB" << FunctionNumber << "_"
1910 << (*CL)->getHeader()->getNumber() << " Depth " << (*CL)->getLoopDepth()
1912 PrintChildLoopComment(OS, *CL, FunctionNumber);
1916 /// EmitBasicBlockLoopComments - Pretty-print comments for basic blocks.
1917 static void EmitBasicBlockLoopComments(const MachineBasicBlock &MBB,
1918 const MachineLoopInfo *LI,
1919 const AsmPrinter &AP) {
1920 // Add loop depth information
1921 const MachineLoop *Loop = LI->getLoopFor(&MBB);
1922 if (Loop == 0) return;
1924 MachineBasicBlock *Header = Loop->getHeader();
1925 assert(Header && "No header for loop");
1927 // If this block is not a loop header, just print out what is the loop header
1929 if (Header != &MBB) {
1930 AP.OutStreamer.AddComment(" in Loop: Header=BB" +
1931 Twine(AP.getFunctionNumber())+"_" +
1932 Twine(Loop->getHeader()->getNumber())+
1933 " Depth="+Twine(Loop->getLoopDepth()));
1937 // Otherwise, it is a loop header. Print out information about child and
1939 raw_ostream &OS = AP.OutStreamer.GetCommentOS();
1941 PrintParentLoopComment(OS, Loop->getParentLoop(), AP.getFunctionNumber());
1944 OS.indent(Loop->getLoopDepth()*2-2);
1949 OS << "Loop Header: Depth=" + Twine(Loop->getLoopDepth()) << '\n';
1951 PrintChildLoopComment(OS, Loop, AP.getFunctionNumber());
1955 /// EmitBasicBlockStart - This method prints the label for the specified
1956 /// MachineBasicBlock, an alignment (if present) and a comment describing
1957 /// it if appropriate.
1958 void AsmPrinter::EmitBasicBlockStart(const MachineBasicBlock *MBB) const {
1959 // Emit an alignment directive for this block, if needed.
1960 if (unsigned Align = MBB->getAlignment())
1961 EmitAlignment(Log2_32(Align));
1963 // If the block has its address taken, emit any labels that were used to
1964 // reference the block. It is possible that there is more than one label
1965 // here, because multiple LLVM BB's may have been RAUW'd to this block after
1966 // the references were generated.
1967 if (MBB->hasAddressTaken()) {
1968 const BasicBlock *BB = MBB->getBasicBlock();
1970 OutStreamer.AddComment("Block address taken");
1972 std::vector<MCSymbol*> Syms = MMI->getAddrLabelSymbolToEmit(BB);
1974 for (unsigned i = 0, e = Syms.size(); i != e; ++i)
1975 OutStreamer.EmitLabel(Syms[i]);
1978 // Print the main label for the block.
1979 if (MBB->pred_empty() || isBlockOnlyReachableByFallthrough(MBB)) {
1980 if (isVerbose() && OutStreamer.hasRawTextSupport()) {
1981 if (const BasicBlock *BB = MBB->getBasicBlock())
1983 OutStreamer.AddComment("%" + BB->getName());
1985 EmitBasicBlockLoopComments(*MBB, LI, *this);
1987 // NOTE: Want this comment at start of line, don't emit with AddComment.
1988 OutStreamer.EmitRawText(Twine(MAI->getCommentString()) + " BB#" +
1989 Twine(MBB->getNumber()) + ":");
1993 if (const BasicBlock *BB = MBB->getBasicBlock())
1995 OutStreamer.AddComment("%" + BB->getName());
1996 EmitBasicBlockLoopComments(*MBB, LI, *this);
1999 OutStreamer.EmitLabel(MBB->getSymbol());
2003 void AsmPrinter::EmitVisibility(MCSymbol *Sym, unsigned Visibility,
2004 bool IsDefinition) const {
2005 MCSymbolAttr Attr = MCSA_Invalid;
2007 switch (Visibility) {
2009 case GlobalValue::HiddenVisibility:
2011 Attr = MAI->getHiddenVisibilityAttr();
2013 Attr = MAI->getHiddenDeclarationVisibilityAttr();
2015 case GlobalValue::ProtectedVisibility:
2016 Attr = MAI->getProtectedVisibilityAttr();
2020 if (Attr != MCSA_Invalid)
2021 OutStreamer.EmitSymbolAttribute(Sym, Attr);
2024 /// isBlockOnlyReachableByFallthough - Return true if the basic block has
2025 /// exactly one predecessor and the control transfer mechanism between
2026 /// the predecessor and this block is a fall-through.
2028 isBlockOnlyReachableByFallthrough(const MachineBasicBlock *MBB) const {
2029 // If this is a landing pad, it isn't a fall through. If it has no preds,
2030 // then nothing falls through to it.
2031 if (MBB->isLandingPad() || MBB->pred_empty())
2034 // If there isn't exactly one predecessor, it can't be a fall through.
2035 MachineBasicBlock::const_pred_iterator PI = MBB->pred_begin(), PI2 = PI;
2037 if (PI2 != MBB->pred_end())
2040 // The predecessor has to be immediately before this block.
2041 MachineBasicBlock *Pred = *PI;
2043 if (!Pred->isLayoutSuccessor(MBB))
2046 // If the block is completely empty, then it definitely does fall through.
2050 // Check the terminators in the previous blocks
2051 for (MachineBasicBlock::iterator II = Pred->getFirstTerminator(),
2052 IE = Pred->end(); II != IE; ++II) {
2053 MachineInstr &MI = *II;
2055 // If it is not a simple branch, we are in a table somewhere.
2056 if (!MI.getDesc().isBranch() || MI.getDesc().isIndirectBranch())
2059 // If we are the operands of one of the branches, this is not
2061 for (MachineInstr::mop_iterator OI = MI.operands_begin(),
2062 OE = MI.operands_end(); OI != OE; ++OI) {
2063 const MachineOperand& OP = *OI;
2066 if (OP.isMBB() && OP.getMBB() == MBB)
2076 GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy *S) {
2077 if (!S->usesMetadata())
2080 gcp_map_type &GCMap = getGCMap(GCMetadataPrinters);
2081 gcp_map_type::iterator GCPI = GCMap.find(S);
2082 if (GCPI != GCMap.end())
2083 return GCPI->second;
2085 const char *Name = S->getName().c_str();
2087 for (GCMetadataPrinterRegistry::iterator
2088 I = GCMetadataPrinterRegistry::begin(),
2089 E = GCMetadataPrinterRegistry::end(); I != E; ++I)
2090 if (strcmp(Name, I->getName()) == 0) {
2091 GCMetadataPrinter *GMP = I->instantiate();
2093 GCMap.insert(std::make_pair(S, GMP));
2097 report_fatal_error("no GCMetadataPrinter registered for GC: " + Twine(Name));