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/ADT/SmallString.h"
19 #include "llvm/ADT/Statistic.h"
20 #include "llvm/Analysis/ConstantFolding.h"
21 #include "llvm/CodeGen/GCMetadataPrinter.h"
22 #include "llvm/CodeGen/MachineConstantPool.h"
23 #include "llvm/CodeGen/MachineFrameInfo.h"
24 #include "llvm/CodeGen/MachineFunction.h"
25 #include "llvm/CodeGen/MachineInstrBundle.h"
26 #include "llvm/CodeGen/MachineJumpTableInfo.h"
27 #include "llvm/CodeGen/MachineLoopInfo.h"
28 #include "llvm/CodeGen/MachineModuleInfo.h"
29 #include "llvm/DebugInfo.h"
30 #include "llvm/IR/DataLayout.h"
31 #include "llvm/IR/Mangler.h"
32 #include "llvm/IR/Module.h"
33 #include "llvm/IR/Operator.h"
34 #include "llvm/MC/MCAsmInfo.h"
35 #include "llvm/MC/MCContext.h"
36 #include "llvm/MC/MCExpr.h"
37 #include "llvm/MC/MCInst.h"
38 #include "llvm/MC/MCSection.h"
39 #include "llvm/MC/MCStreamer.h"
40 #include "llvm/MC/MCSymbol.h"
41 #include "llvm/Support/ErrorHandling.h"
42 #include "llvm/Support/Format.h"
43 #include "llvm/Support/MathExtras.h"
44 #include "llvm/Support/Timer.h"
45 #include "llvm/Target/TargetFrameLowering.h"
46 #include "llvm/Target/TargetInstrInfo.h"
47 #include "llvm/Target/TargetLowering.h"
48 #include "llvm/Target/TargetLoweringObjectFile.h"
49 #include "llvm/Target/TargetOptions.h"
50 #include "llvm/Target/TargetRegisterInfo.h"
51 #include "llvm/Transforms/Utils/GlobalStatus.h"
54 static const char *const DWARFGroupName = "DWARF Emission";
55 static const char *const DbgTimerName = "DWARF Debug Writer";
56 static const char *const EHTimerName = "DWARF Exception Writer";
58 STATISTIC(EmittedInsts, "Number of machine instrs printed");
60 char AsmPrinter::ID = 0;
62 typedef DenseMap<GCStrategy*,GCMetadataPrinter*> gcp_map_type;
63 static gcp_map_type &getGCMap(void *&P) {
65 P = new gcp_map_type();
66 return *(gcp_map_type*)P;
70 /// getGVAlignmentLog2 - Return the alignment to use for the specified global
71 /// value in log2 form. This rounds up to the preferred alignment if possible
73 static unsigned getGVAlignmentLog2(const GlobalValue *GV, const DataLayout &TD,
74 unsigned InBits = 0) {
76 if (const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV))
77 NumBits = TD.getPreferredAlignmentLog(GVar);
79 // If InBits is specified, round it to it.
83 // If the GV has a specified alignment, take it into account.
84 if (GV->getAlignment() == 0)
87 unsigned GVAlign = Log2_32(GV->getAlignment());
89 // If the GVAlign is larger than NumBits, or if we are required to obey
90 // NumBits because the GV has an assigned section, obey it.
91 if (GVAlign > NumBits || GV->hasSection())
96 AsmPrinter::AsmPrinter(TargetMachine &tm, MCStreamer &Streamer)
97 : MachineFunctionPass(ID),
98 TM(tm), MAI(tm.getMCAsmInfo()), MII(tm.getInstrInfo()),
99 OutContext(Streamer.getContext()),
100 OutStreamer(Streamer),
101 LastMI(0), LastFn(0), Counter(~0U), SetCounter(0) {
102 DD = 0; MMI = 0; LI = 0; MF = 0;
103 CurrentFnSym = CurrentFnSymForSize = 0;
104 GCMetadataPrinters = 0;
105 VerboseAsm = Streamer.isVerboseAsm();
108 AsmPrinter::~AsmPrinter() {
109 assert(DD == 0 && Handlers.empty() && "Debug/EH info didn't get finalized");
111 if (GCMetadataPrinters != 0) {
112 gcp_map_type &GCMap = getGCMap(GCMetadataPrinters);
114 for (gcp_map_type::iterator I = GCMap.begin(), E = GCMap.end(); I != E; ++I)
117 GCMetadataPrinters = 0;
123 /// getFunctionNumber - Return a unique ID for the current function.
125 unsigned AsmPrinter::getFunctionNumber() const {
126 return MF->getFunctionNumber();
129 const TargetLoweringObjectFile &AsmPrinter::getObjFileLowering() const {
130 return TM.getTargetLowering()->getObjFileLowering();
133 /// getDataLayout - Return information about data layout.
134 const DataLayout &AsmPrinter::getDataLayout() const {
135 return *TM.getDataLayout();
138 StringRef AsmPrinter::getTargetTriple() const {
139 return TM.getTargetTriple();
142 /// getCurrentSection() - Return the current section we are emitting to.
143 const MCSection *AsmPrinter::getCurrentSection() const {
144 return OutStreamer.getCurrentSection().first;
149 void AsmPrinter::getAnalysisUsage(AnalysisUsage &AU) const {
150 AU.setPreservesAll();
151 MachineFunctionPass::getAnalysisUsage(AU);
152 AU.addRequired<MachineModuleInfo>();
153 AU.addRequired<GCModuleInfo>();
155 AU.addRequired<MachineLoopInfo>();
158 bool AsmPrinter::doInitialization(Module &M) {
159 MMI = getAnalysisIfAvailable<MachineModuleInfo>();
160 MMI->AnalyzeModule(M);
162 // Initialize TargetLoweringObjectFile.
163 const_cast<TargetLoweringObjectFile&>(getObjFileLowering())
164 .Initialize(OutContext, TM);
166 OutStreamer.InitSections(false);
168 Mang = new Mangler(TM.getDataLayout());
170 // Allow the target to emit any magic that it wants at the start of the file.
171 EmitStartOfAsmFile(M);
173 // Very minimal debug info. It is ignored if we emit actual debug info. If we
174 // don't, this at least helps the user find where a global came from.
175 if (MAI->hasSingleParameterDotFile()) {
177 OutStreamer.EmitFileDirective(M.getModuleIdentifier());
180 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
181 assert(MI && "AsmPrinter didn't require GCModuleInfo?");
182 for (GCModuleInfo::iterator I = MI->begin(), E = MI->end(); I != E; ++I)
183 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I))
184 MP->beginAssembly(*this);
186 // Emit module-level inline asm if it exists.
187 if (!M.getModuleInlineAsm().empty()) {
188 OutStreamer.AddComment("Start of file scope inline assembly");
189 OutStreamer.AddBlankLine();
190 EmitInlineAsm(M.getModuleInlineAsm()+"\n");
191 OutStreamer.AddComment("End of file scope inline assembly");
192 OutStreamer.AddBlankLine();
195 if (MAI->doesSupportDebugInformation()) {
196 DD = new DwarfDebug(this, &M);
197 Handlers.push_back(HandlerInfo(DD, DbgTimerName, DWARFGroupName));
200 DwarfException *DE = 0;
201 switch (MAI->getExceptionHandlingType()) {
202 case ExceptionHandling::None:
204 case ExceptionHandling::SjLj:
205 case ExceptionHandling::DwarfCFI:
206 DE = new DwarfCFIException(this);
208 case ExceptionHandling::ARM:
209 DE = new ARMException(this);
211 case ExceptionHandling::Win64:
212 DE = new Win64Exception(this);
216 Handlers.push_back(HandlerInfo(DE, EHTimerName, DWARFGroupName));
220 void AsmPrinter::EmitLinkage(const GlobalValue *GV, MCSymbol *GVSym) const {
221 GlobalValue::LinkageTypes Linkage = GV->getLinkage();
223 case GlobalValue::CommonLinkage:
224 case GlobalValue::LinkOnceAnyLinkage:
225 case GlobalValue::LinkOnceODRLinkage:
226 case GlobalValue::WeakAnyLinkage:
227 case GlobalValue::WeakODRLinkage:
228 case GlobalValue::LinkerPrivateWeakLinkage:
229 if (MAI->hasWeakDefDirective()) {
231 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
233 bool CanBeHidden = false;
235 if (Linkage == GlobalValue::LinkOnceODRLinkage &&
236 MAI->hasWeakDefCanBeHiddenDirective()) {
237 if (GV->hasUnnamedAddr()) {
241 if (!GlobalStatus::analyzeGlobal(GV, GS) && !GS.IsCompared)
247 // .weak_definition _foo
248 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_WeakDefinition);
250 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_WeakDefAutoPrivate);
251 } else if (MAI->hasLinkOnceDirective()) {
253 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
254 //NOTE: linkonce is handled by the section the symbol was assigned to.
257 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Weak);
260 case GlobalValue::AppendingLinkage:
261 // FIXME: appending linkage variables should go into a section of
262 // their name or something. For now, just emit them as external.
263 case GlobalValue::ExternalLinkage:
264 // If external or appending, declare as a global symbol.
266 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
268 case GlobalValue::PrivateLinkage:
269 case GlobalValue::InternalLinkage:
270 case GlobalValue::LinkerPrivateLinkage:
272 case GlobalValue::AvailableExternallyLinkage:
273 llvm_unreachable("Should never emit this");
274 case GlobalValue::ExternalWeakLinkage:
275 llvm_unreachable("Don't know how to emit these");
277 llvm_unreachable("Unknown linkage type!");
280 MCSymbol *AsmPrinter::getSymbol(const GlobalValue *GV) const {
281 return getObjFileLowering().getSymbol(*Mang, GV);
284 /// EmitGlobalVariable - Emit the specified global variable to the .s file.
285 void AsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) {
286 if (GV->hasInitializer()) {
287 // Check to see if this is a special global used by LLVM, if so, emit it.
288 if (EmitSpecialLLVMGlobal(GV))
292 GV->printAsOperand(OutStreamer.GetCommentOS(),
293 /*PrintType=*/false, GV->getParent());
294 OutStreamer.GetCommentOS() << '\n';
298 MCSymbol *GVSym = getSymbol(GV);
299 EmitVisibility(GVSym, GV->getVisibility(), !GV->isDeclaration());
301 if (!GV->hasInitializer()) // External globals require no extra code.
304 if (MAI->hasDotTypeDotSizeDirective())
305 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_ELF_TypeObject);
307 SectionKind GVKind = TargetLoweringObjectFile::getKindForGlobal(GV, TM);
309 const DataLayout *DL = TM.getDataLayout();
310 uint64_t Size = DL->getTypeAllocSize(GV->getType()->getElementType());
312 // If the alignment is specified, we *must* obey it. Overaligning a global
313 // with a specified alignment is a prompt way to break globals emitted to
314 // sections and expected to be contiguous (e.g. ObjC metadata).
315 unsigned AlignLog = getGVAlignmentLog2(GV, *DL);
317 for (unsigned I = 0, E = Handlers.size(); I != E; ++I) {
318 const HandlerInfo &OI = Handlers[I];
319 NamedRegionTimer T(OI.TimerName, OI.TimerGroupName, TimePassesIsEnabled);
320 OI.Handler->setSymbolSize(GVSym, Size);
323 // Handle common and BSS local symbols (.lcomm).
324 if (GVKind.isCommon() || GVKind.isBSSLocal()) {
325 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
326 unsigned Align = 1 << AlignLog;
328 // Handle common symbols.
329 if (GVKind.isCommon()) {
330 if (!getObjFileLowering().getCommDirectiveSupportsAlignment())
334 OutStreamer.EmitCommonSymbol(GVSym, Size, Align);
338 // Handle local BSS symbols.
339 if (MAI->hasMachoZeroFillDirective()) {
340 const MCSection *TheSection =
341 getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM);
342 // .zerofill __DATA, __bss, _foo, 400, 5
343 OutStreamer.EmitZerofill(TheSection, GVSym, Size, Align);
347 // Use .lcomm only if it supports user-specified alignment.
348 // Otherwise, while it would still be correct to use .lcomm in some
349 // cases (e.g. when Align == 1), the external assembler might enfore
350 // some -unknown- default alignment behavior, which could cause
351 // spurious differences between external and integrated assembler.
352 // Prefer to simply fall back to .local / .comm in this case.
353 if (MAI->getLCOMMDirectiveAlignmentType() != LCOMM::NoAlignment) {
355 OutStreamer.EmitLocalCommonSymbol(GVSym, Size, Align);
359 if (!getObjFileLowering().getCommDirectiveSupportsAlignment())
363 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Local);
365 OutStreamer.EmitCommonSymbol(GVSym, Size, Align);
369 const MCSection *TheSection =
370 getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM);
372 // Handle the zerofill directive on darwin, which is a special form of BSS
374 if (GVKind.isBSSExtern() && MAI->hasMachoZeroFillDirective()) {
375 if (Size == 0) Size = 1; // zerofill of 0 bytes is undefined.
378 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
379 // .zerofill __DATA, __common, _foo, 400, 5
380 OutStreamer.EmitZerofill(TheSection, GVSym, Size, 1 << AlignLog);
384 // Handle thread local data for mach-o which requires us to output an
385 // additional structure of data and mangle the original symbol so that we
386 // can reference it later.
388 // TODO: This should become an "emit thread local global" method on TLOF.
389 // All of this macho specific stuff should be sunk down into TLOFMachO and
390 // stuff like "TLSExtraDataSection" should no longer be part of the parent
391 // TLOF class. This will also make it more obvious that stuff like
392 // MCStreamer::EmitTBSSSymbol is macho specific and only called from macho
394 if (GVKind.isThreadLocal() && MAI->hasMachoTBSSDirective()) {
395 // Emit the .tbss symbol
397 OutContext.GetOrCreateSymbol(GVSym->getName() + Twine("$tlv$init"));
399 if (GVKind.isThreadBSS()) {
400 TheSection = getObjFileLowering().getTLSBSSSection();
401 OutStreamer.EmitTBSSSymbol(TheSection, MangSym, Size, 1 << AlignLog);
402 } else if (GVKind.isThreadData()) {
403 OutStreamer.SwitchSection(TheSection);
405 EmitAlignment(AlignLog, GV);
406 OutStreamer.EmitLabel(MangSym);
408 EmitGlobalConstant(GV->getInitializer());
411 OutStreamer.AddBlankLine();
413 // Emit the variable struct for the runtime.
414 const MCSection *TLVSect
415 = getObjFileLowering().getTLSExtraDataSection();
417 OutStreamer.SwitchSection(TLVSect);
418 // Emit the linkage here.
419 EmitLinkage(GV, GVSym);
420 OutStreamer.EmitLabel(GVSym);
422 // Three pointers in size:
423 // - __tlv_bootstrap - used to make sure support exists
424 // - spare pointer, used when mapped by the runtime
425 // - pointer to mangled symbol above with initializer
426 unsigned PtrSize = DL->getPointerTypeSize(GV->getType());
427 OutStreamer.EmitSymbolValue(GetExternalSymbolSymbol("_tlv_bootstrap"),
429 OutStreamer.EmitIntValue(0, PtrSize);
430 OutStreamer.EmitSymbolValue(MangSym, PtrSize);
432 OutStreamer.AddBlankLine();
436 OutStreamer.SwitchSection(TheSection);
438 EmitLinkage(GV, GVSym);
439 EmitAlignment(AlignLog, GV);
441 OutStreamer.EmitLabel(GVSym);
443 EmitGlobalConstant(GV->getInitializer());
445 if (MAI->hasDotTypeDotSizeDirective())
447 OutStreamer.EmitELFSize(GVSym, MCConstantExpr::Create(Size, OutContext));
449 OutStreamer.AddBlankLine();
452 /// EmitFunctionHeader - This method emits the header for the current
454 void AsmPrinter::EmitFunctionHeader() {
455 // Print out constants referenced by the function
458 // Print the 'header' of function.
459 const Function *F = MF->getFunction();
461 OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang, TM));
462 EmitVisibility(CurrentFnSym, F->getVisibility());
464 EmitLinkage(F, CurrentFnSym);
465 EmitAlignment(MF->getAlignment(), F);
467 if (MAI->hasDotTypeDotSizeDirective())
468 OutStreamer.EmitSymbolAttribute(CurrentFnSym, MCSA_ELF_TypeFunction);
471 F->printAsOperand(OutStreamer.GetCommentOS(),
472 /*PrintType=*/false, F->getParent());
473 OutStreamer.GetCommentOS() << '\n';
476 // Emit the CurrentFnSym. This is a virtual function to allow targets to
477 // do their wild and crazy things as required.
478 EmitFunctionEntryLabel();
480 // If the function had address-taken blocks that got deleted, then we have
481 // references to the dangling symbols. Emit them at the start of the function
482 // so that we don't get references to undefined symbols.
483 std::vector<MCSymbol*> DeadBlockSyms;
484 MMI->takeDeletedSymbolsForFunction(F, DeadBlockSyms);
485 for (unsigned i = 0, e = DeadBlockSyms.size(); i != e; ++i) {
486 OutStreamer.AddComment("Address taken block that was later removed");
487 OutStreamer.EmitLabel(DeadBlockSyms[i]);
490 // Emit pre-function debug and/or EH information.
491 for (unsigned I = 0, E = Handlers.size(); I != E; ++I) {
492 const HandlerInfo &OI = Handlers[I];
493 NamedRegionTimer T(OI.TimerName, OI.TimerGroupName, TimePassesIsEnabled);
494 OI.Handler->beginFunction(MF);
497 // Emit the prefix data.
498 if (F->hasPrefixData())
499 EmitGlobalConstant(F->getPrefixData());
502 /// EmitFunctionEntryLabel - Emit the label that is the entrypoint for the
503 /// function. This can be overridden by targets as required to do custom stuff.
504 void AsmPrinter::EmitFunctionEntryLabel() {
505 // The function label could have already been emitted if two symbols end up
506 // conflicting due to asm renaming. Detect this and emit an error.
507 if (CurrentFnSym->isUndefined())
508 return OutStreamer.EmitLabel(CurrentFnSym);
510 report_fatal_error("'" + Twine(CurrentFnSym->getName()) +
511 "' label emitted multiple times to assembly file");
514 /// emitComments - Pretty-print comments for instructions.
515 static void emitComments(const MachineInstr &MI, raw_ostream &CommentOS) {
516 const MachineFunction *MF = MI.getParent()->getParent();
517 const TargetMachine &TM = MF->getTarget();
519 // Check for spills and reloads
522 const MachineFrameInfo *FrameInfo = MF->getFrameInfo();
524 // We assume a single instruction only has a spill or reload, not
526 const MachineMemOperand *MMO;
527 if (TM.getInstrInfo()->isLoadFromStackSlotPostFE(&MI, FI)) {
528 if (FrameInfo->isSpillSlotObjectIndex(FI)) {
529 MMO = *MI.memoperands_begin();
530 CommentOS << MMO->getSize() << "-byte Reload\n";
532 } else if (TM.getInstrInfo()->hasLoadFromStackSlot(&MI, MMO, FI)) {
533 if (FrameInfo->isSpillSlotObjectIndex(FI))
534 CommentOS << MMO->getSize() << "-byte Folded Reload\n";
535 } else if (TM.getInstrInfo()->isStoreToStackSlotPostFE(&MI, FI)) {
536 if (FrameInfo->isSpillSlotObjectIndex(FI)) {
537 MMO = *MI.memoperands_begin();
538 CommentOS << MMO->getSize() << "-byte Spill\n";
540 } else if (TM.getInstrInfo()->hasStoreToStackSlot(&MI, MMO, FI)) {
541 if (FrameInfo->isSpillSlotObjectIndex(FI))
542 CommentOS << MMO->getSize() << "-byte Folded Spill\n";
545 // Check for spill-induced copies
546 if (MI.getAsmPrinterFlag(MachineInstr::ReloadReuse))
547 CommentOS << " Reload Reuse\n";
550 /// emitImplicitDef - This method emits the specified machine instruction
551 /// that is an implicit def.
552 void AsmPrinter::emitImplicitDef(const MachineInstr *MI) const {
553 unsigned RegNo = MI->getOperand(0).getReg();
554 OutStreamer.AddComment(Twine("implicit-def: ") +
555 TM.getRegisterInfo()->getName(RegNo));
556 OutStreamer.AddBlankLine();
559 static void emitKill(const MachineInstr *MI, AsmPrinter &AP) {
560 std::string Str = "kill:";
561 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
562 const MachineOperand &Op = MI->getOperand(i);
563 assert(Op.isReg() && "KILL instruction must have only register operands");
565 Str += AP.TM.getRegisterInfo()->getName(Op.getReg());
566 Str += (Op.isDef() ? "<def>" : "<kill>");
568 AP.OutStreamer.AddComment(Str);
569 AP.OutStreamer.AddBlankLine();
572 /// emitDebugValueComment - This method handles the target-independent form
573 /// of DBG_VALUE, returning true if it was able to do so. A false return
574 /// means the target will need to handle MI in EmitInstruction.
575 static bool emitDebugValueComment(const MachineInstr *MI, AsmPrinter &AP) {
576 // This code handles only the 3-operand target-independent form.
577 if (MI->getNumOperands() != 3)
580 SmallString<128> Str;
581 raw_svector_ostream OS(Str);
582 OS << "DEBUG_VALUE: ";
584 DIVariable V(MI->getOperand(2).getMetadata());
585 if (V.getContext().isSubprogram()) {
586 StringRef Name = DISubprogram(V.getContext()).getDisplayName();
590 OS << V.getName() << " <- ";
592 // The second operand is only an offset if it's an immediate.
593 bool Deref = MI->getOperand(0).isReg() && MI->getOperand(1).isImm();
594 int64_t Offset = Deref ? MI->getOperand(1).getImm() : 0;
596 // Register or immediate value. Register 0 means undef.
597 if (MI->getOperand(0).isFPImm()) {
598 APFloat APF = APFloat(MI->getOperand(0).getFPImm()->getValueAPF());
599 if (MI->getOperand(0).getFPImm()->getType()->isFloatTy()) {
600 OS << (double)APF.convertToFloat();
601 } else if (MI->getOperand(0).getFPImm()->getType()->isDoubleTy()) {
602 OS << APF.convertToDouble();
604 // There is no good way to print long double. Convert a copy to
605 // double. Ah well, it's only a comment.
607 APF.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven,
609 OS << "(long double) " << APF.convertToDouble();
611 } else if (MI->getOperand(0).isImm()) {
612 OS << MI->getOperand(0).getImm();
613 } else if (MI->getOperand(0).isCImm()) {
614 MI->getOperand(0).getCImm()->getValue().print(OS, false /*isSigned*/);
617 if (MI->getOperand(0).isReg()) {
618 Reg = MI->getOperand(0).getReg();
620 assert(MI->getOperand(0).isFI() && "Unknown operand type");
621 const TargetFrameLowering *TFI = AP.TM.getFrameLowering();
622 Offset += TFI->getFrameIndexReference(*AP.MF,
623 MI->getOperand(0).getIndex(), Reg);
627 // Suppress offset, it is not meaningful here.
629 // NOTE: Want this comment at start of line, don't emit with AddComment.
630 AP.OutStreamer.emitRawComment(OS.str());
635 OS << AP.TM.getRegisterInfo()->getName(Reg);
639 OS << '+' << Offset << ']';
641 // NOTE: Want this comment at start of line, don't emit with AddComment.
642 AP.OutStreamer.emitRawComment(OS.str());
646 AsmPrinter::CFIMoveType AsmPrinter::needsCFIMoves() {
647 if (MAI->getExceptionHandlingType() == ExceptionHandling::DwarfCFI &&
648 MF->getFunction()->needsUnwindTableEntry())
651 if (MMI->hasDebugInfo())
657 bool AsmPrinter::needsSEHMoves() {
658 return MAI->getExceptionHandlingType() == ExceptionHandling::Win64 &&
659 MF->getFunction()->needsUnwindTableEntry();
662 void AsmPrinter::emitPrologLabel(const MachineInstr &MI) {
663 const MCSymbol *Label = MI.getOperand(0).getMCSymbol();
665 if (MAI->getExceptionHandlingType() != ExceptionHandling::DwarfCFI)
668 if (needsCFIMoves() == CFI_M_None)
671 if (MMI->getCompactUnwindEncoding() != 0)
672 OutStreamer.EmitCompactUnwindEncoding(MMI->getCompactUnwindEncoding());
674 const MachineModuleInfo &MMI = MF->getMMI();
675 const std::vector<MCCFIInstruction> &Instrs = MMI.getFrameInstructions();
676 bool FoundOne = false;
678 for (std::vector<MCCFIInstruction>::const_iterator I = Instrs.begin(),
679 E = Instrs.end(); I != E; ++I) {
680 if (I->getLabel() == Label) {
681 emitCFIInstruction(*I);
688 /// EmitFunctionBody - This method emits the body and trailer for a
690 void AsmPrinter::EmitFunctionBody() {
691 // Emit target-specific gunk before the function body.
692 EmitFunctionBodyStart();
694 bool ShouldPrintDebugScopes = MMI->hasDebugInfo();
696 // Print out code for the function.
697 bool HasAnyRealCode = false;
698 const MachineInstr *LastMI = 0;
699 for (MachineFunction::const_iterator I = MF->begin(), E = MF->end();
701 // Print a label for the basic block.
702 EmitBasicBlockStart(I);
703 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
707 // Print the assembly for the instruction.
708 if (!II->isLabel() && !II->isImplicitDef() && !II->isKill() &&
709 !II->isDebugValue()) {
710 HasAnyRealCode = true;
714 if (ShouldPrintDebugScopes) {
715 for (unsigned III = 0, EEE = Handlers.size(); III != EEE; ++III) {
716 const HandlerInfo &OI = Handlers[III];
717 NamedRegionTimer T(OI.TimerName, OI.TimerGroupName,
718 TimePassesIsEnabled);
719 OI.Handler->beginInstruction(II);
724 emitComments(*II, OutStreamer.GetCommentOS());
726 switch (II->getOpcode()) {
727 case TargetOpcode::PROLOG_LABEL:
728 emitPrologLabel(*II);
731 case TargetOpcode::EH_LABEL:
732 case TargetOpcode::GC_LABEL:
733 OutStreamer.EmitLabel(II->getOperand(0).getMCSymbol());
735 case TargetOpcode::INLINEASM:
738 case TargetOpcode::DBG_VALUE:
740 if (!emitDebugValueComment(II, *this))
744 case TargetOpcode::IMPLICIT_DEF:
745 if (isVerbose()) emitImplicitDef(II);
747 case TargetOpcode::KILL:
748 if (isVerbose()) emitKill(II, *this);
751 if (!TM.hasMCUseLoc())
752 MCLineEntry::Make(&OutStreamer, getCurrentSection());
758 if (ShouldPrintDebugScopes) {
759 for (unsigned III = 0, EEE = Handlers.size(); III != EEE; ++III) {
760 const HandlerInfo &OI = Handlers[III];
761 NamedRegionTimer T(OI.TimerName, OI.TimerGroupName,
762 TimePassesIsEnabled);
763 OI.Handler->endInstruction();
769 // If the last instruction was a prolog label, then we have a situation where
770 // we emitted a prolog but no function body. This results in the ending prolog
771 // label equaling the end of function label and an invalid "row" in the
772 // FDE. We need to emit a noop in this situation so that the FDE's rows are
774 bool RequiresNoop = LastMI && LastMI->isPrologLabel();
776 // If the function is empty and the object file uses .subsections_via_symbols,
777 // then we need to emit *something* to the function body to prevent the
778 // labels from collapsing together. Just emit a noop.
779 if ((MAI->hasSubsectionsViaSymbols() && !HasAnyRealCode) || RequiresNoop) {
781 TM.getInstrInfo()->getNoopForMachoTarget(Noop);
782 if (Noop.getOpcode()) {
783 OutStreamer.AddComment("avoids zero-length function");
784 OutStreamer.EmitInstruction(Noop);
785 } else // Target not mc-ized yet.
786 OutStreamer.EmitRawText(StringRef("\tnop\n"));
789 const Function *F = MF->getFunction();
790 for (Function::const_iterator i = F->begin(), e = F->end(); i != e; ++i) {
791 const BasicBlock *BB = i;
792 if (!BB->hasAddressTaken())
794 MCSymbol *Sym = GetBlockAddressSymbol(BB);
795 if (Sym->isDefined())
797 OutStreamer.AddComment("Address of block that was removed by CodeGen");
798 OutStreamer.EmitLabel(Sym);
801 // Emit target-specific gunk after the function body.
802 EmitFunctionBodyEnd();
804 // If the target wants a .size directive for the size of the function, emit
806 if (MAI->hasDotTypeDotSizeDirective()) {
807 // Create a symbol for the end of function, so we can get the size as
808 // difference between the function label and the temp label.
809 MCSymbol *FnEndLabel = OutContext.CreateTempSymbol();
810 OutStreamer.EmitLabel(FnEndLabel);
812 const MCExpr *SizeExp =
813 MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(FnEndLabel, OutContext),
814 MCSymbolRefExpr::Create(CurrentFnSymForSize,
817 OutStreamer.EmitELFSize(CurrentFnSym, SizeExp);
820 // Emit post-function debug and/or EH information.
821 for (unsigned I = 0, E = Handlers.size(); I != E; ++I) {
822 const HandlerInfo &OI = Handlers[I];
823 NamedRegionTimer T(OI.TimerName, OI.TimerGroupName, TimePassesIsEnabled);
824 OI.Handler->endFunction(MF);
828 // Print out jump tables referenced by the function.
831 OutStreamer.AddBlankLine();
834 /// EmitDwarfRegOp - Emit dwarf register operation.
835 void AsmPrinter::EmitDwarfRegOp(const MachineLocation &MLoc,
836 bool Indirect) const {
837 const TargetRegisterInfo *TRI = TM.getRegisterInfo();
838 int Reg = TRI->getDwarfRegNum(MLoc.getReg(), false);
840 for (MCSuperRegIterator SR(MLoc.getReg(), TRI); SR.isValid() && Reg < 0;
842 Reg = TRI->getDwarfRegNum(*SR, false);
843 // FIXME: Get the bit range this register uses of the superregister
844 // so that we can produce a DW_OP_bit_piece
847 // FIXME: Handle cases like a super register being encoded as
848 // DW_OP_reg 32 DW_OP_piece 4 DW_OP_reg 33
850 // FIXME: We have no reasonable way of handling errors in here. The
851 // caller might be in the middle of an dwarf expression. We should
852 // probably assert that Reg >= 0 once debug info generation is more mature.
854 if (MLoc.isIndirect() || Indirect) {
856 OutStreamer.AddComment(
857 dwarf::OperationEncodingString(dwarf::DW_OP_breg0 + Reg));
858 EmitInt8(dwarf::DW_OP_breg0 + Reg);
860 OutStreamer.AddComment("DW_OP_bregx");
861 EmitInt8(dwarf::DW_OP_bregx);
862 OutStreamer.AddComment(Twine(Reg));
865 EmitSLEB128(!MLoc.isIndirect() ? 0 : MLoc.getOffset());
866 if (MLoc.isIndirect() && Indirect)
867 EmitInt8(dwarf::DW_OP_deref);
870 OutStreamer.AddComment(
871 dwarf::OperationEncodingString(dwarf::DW_OP_reg0 + Reg));
872 EmitInt8(dwarf::DW_OP_reg0 + Reg);
874 OutStreamer.AddComment("DW_OP_regx");
875 EmitInt8(dwarf::DW_OP_regx);
876 OutStreamer.AddComment(Twine(Reg));
881 // FIXME: Produce a DW_OP_bit_piece if we used a superregister
884 bool AsmPrinter::doFinalization(Module &M) {
885 // Emit global variables.
886 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
888 EmitGlobalVariable(I);
890 // Emit visibility info for declarations
891 for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I) {
892 const Function &F = *I;
893 if (!F.isDeclaration())
895 GlobalValue::VisibilityTypes V = F.getVisibility();
896 if (V == GlobalValue::DefaultVisibility)
899 MCSymbol *Name = getSymbol(&F);
900 EmitVisibility(Name, V, false);
903 // Emit module flags.
904 SmallVector<Module::ModuleFlagEntry, 8> ModuleFlags;
905 M.getModuleFlagsMetadata(ModuleFlags);
906 if (!ModuleFlags.empty())
907 getObjFileLowering().emitModuleFlags(OutStreamer, ModuleFlags, Mang, TM);
909 // Make sure we wrote out everything we need.
912 // Finalize debug and EH information.
913 for (unsigned I = 0, E = Handlers.size(); I != E; ++I) {
914 const HandlerInfo &OI = Handlers[I];
915 NamedRegionTimer T(OI.TimerName, OI.TimerGroupName,
916 TimePassesIsEnabled);
917 OI.Handler->endModule();
923 // If the target wants to know about weak references, print them all.
924 if (MAI->getWeakRefDirective()) {
925 // FIXME: This is not lazy, it would be nice to only print weak references
926 // to stuff that is actually used. Note that doing so would require targets
927 // to notice uses in operands (due to constant exprs etc). This should
928 // happen with the MC stuff eventually.
930 // Print out module-level global variables here.
931 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
933 if (!I->hasExternalWeakLinkage()) continue;
934 OutStreamer.EmitSymbolAttribute(getSymbol(I), MCSA_WeakReference);
937 for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I) {
938 if (!I->hasExternalWeakLinkage()) continue;
939 OutStreamer.EmitSymbolAttribute(getSymbol(I), MCSA_WeakReference);
943 if (MAI->hasSetDirective()) {
944 OutStreamer.AddBlankLine();
945 for (Module::const_alias_iterator I = M.alias_begin(), E = M.alias_end();
947 MCSymbol *Name = getSymbol(I);
949 const GlobalValue *GV = I->getAliasedGlobal();
950 if (GV->isDeclaration()) {
951 report_fatal_error(Name->getName() +
952 ": Target doesn't support aliases to declarations");
955 MCSymbol *Target = getSymbol(GV);
957 if (I->hasExternalLinkage() || !MAI->getWeakRefDirective())
958 OutStreamer.EmitSymbolAttribute(Name, MCSA_Global);
959 else if (I->hasWeakLinkage() || I->hasLinkOnceLinkage())
960 OutStreamer.EmitSymbolAttribute(Name, MCSA_WeakReference);
962 assert(I->hasLocalLinkage() && "Invalid alias linkage");
964 EmitVisibility(Name, I->getVisibility());
966 // Emit the directives as assignments aka .set:
967 OutStreamer.EmitAssignment(Name,
968 MCSymbolRefExpr::Create(Target, OutContext));
972 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
973 assert(MI && "AsmPrinter didn't require GCModuleInfo?");
974 for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; )
975 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*--I))
976 MP->finishAssembly(*this);
978 // Emit llvm.ident metadata in an '.ident' directive.
981 // If we don't have any trampolines, then we don't require stack memory
982 // to be executable. Some targets have a directive to declare this.
983 Function *InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline");
984 if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty())
985 if (const MCSection *S = MAI->getNonexecutableStackSection(OutContext))
986 OutStreamer.SwitchSection(S);
988 // Allow the target to emit any magic that it wants at the end of the file,
989 // after everything else has gone out.
992 delete Mang; Mang = 0;
995 OutStreamer.Finish();
1001 void AsmPrinter::SetupMachineFunction(MachineFunction &MF) {
1003 // Get the function symbol.
1004 CurrentFnSym = getSymbol(MF.getFunction());
1005 CurrentFnSymForSize = CurrentFnSym;
1008 LI = &getAnalysis<MachineLoopInfo>();
1012 // SectionCPs - Keep track the alignment, constpool entries per Section.
1016 SmallVector<unsigned, 4> CPEs;
1017 SectionCPs(const MCSection *s, unsigned a) : S(s), Alignment(a) {}
1021 /// EmitConstantPool - Print to the current output stream assembly
1022 /// representations of the constants in the constant pool MCP. This is
1023 /// used to print out constants which have been "spilled to memory" by
1024 /// the code generator.
1026 void AsmPrinter::EmitConstantPool() {
1027 const MachineConstantPool *MCP = MF->getConstantPool();
1028 const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
1029 if (CP.empty()) return;
1031 // Calculate sections for constant pool entries. We collect entries to go into
1032 // the same section together to reduce amount of section switch statements.
1033 SmallVector<SectionCPs, 4> CPSections;
1034 for (unsigned i = 0, e = CP.size(); i != e; ++i) {
1035 const MachineConstantPoolEntry &CPE = CP[i];
1036 unsigned Align = CPE.getAlignment();
1039 switch (CPE.getRelocationInfo()) {
1040 default: llvm_unreachable("Unknown section kind");
1041 case 2: Kind = SectionKind::getReadOnlyWithRel(); break;
1043 Kind = SectionKind::getReadOnlyWithRelLocal();
1046 switch (TM.getDataLayout()->getTypeAllocSize(CPE.getType())) {
1047 case 4: Kind = SectionKind::getMergeableConst4(); break;
1048 case 8: Kind = SectionKind::getMergeableConst8(); break;
1049 case 16: Kind = SectionKind::getMergeableConst16();break;
1050 default: Kind = SectionKind::getMergeableConst(); break;
1054 const MCSection *S = getObjFileLowering().getSectionForConstant(Kind);
1056 // The number of sections are small, just do a linear search from the
1057 // last section to the first.
1059 unsigned SecIdx = CPSections.size();
1060 while (SecIdx != 0) {
1061 if (CPSections[--SecIdx].S == S) {
1067 SecIdx = CPSections.size();
1068 CPSections.push_back(SectionCPs(S, Align));
1071 if (Align > CPSections[SecIdx].Alignment)
1072 CPSections[SecIdx].Alignment = Align;
1073 CPSections[SecIdx].CPEs.push_back(i);
1076 // Now print stuff into the calculated sections.
1077 for (unsigned i = 0, e = CPSections.size(); i != e; ++i) {
1078 OutStreamer.SwitchSection(CPSections[i].S);
1079 EmitAlignment(Log2_32(CPSections[i].Alignment));
1081 unsigned Offset = 0;
1082 for (unsigned j = 0, ee = CPSections[i].CPEs.size(); j != ee; ++j) {
1083 unsigned CPI = CPSections[i].CPEs[j];
1084 MachineConstantPoolEntry CPE = CP[CPI];
1086 // Emit inter-object padding for alignment.
1087 unsigned AlignMask = CPE.getAlignment() - 1;
1088 unsigned NewOffset = (Offset + AlignMask) & ~AlignMask;
1089 OutStreamer.EmitZeros(NewOffset - Offset);
1091 Type *Ty = CPE.getType();
1092 Offset = NewOffset + TM.getDataLayout()->getTypeAllocSize(Ty);
1093 OutStreamer.EmitLabel(GetCPISymbol(CPI));
1095 if (CPE.isMachineConstantPoolEntry())
1096 EmitMachineConstantPoolValue(CPE.Val.MachineCPVal);
1098 EmitGlobalConstant(CPE.Val.ConstVal);
1103 /// EmitJumpTableInfo - Print assembly representations of the jump tables used
1104 /// by the current function to the current output stream.
1106 void AsmPrinter::EmitJumpTableInfo() {
1107 const DataLayout *DL = MF->getTarget().getDataLayout();
1108 const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo();
1109 if (MJTI == 0) return;
1110 if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_Inline) return;
1111 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
1112 if (JT.empty()) return;
1114 // Pick the directive to use to print the jump table entries, and switch to
1115 // the appropriate section.
1116 const Function *F = MF->getFunction();
1117 bool JTInDiffSection = false;
1118 if (// In PIC mode, we need to emit the jump table to the same section as the
1119 // function body itself, otherwise the label differences won't make sense.
1120 // FIXME: Need a better predicate for this: what about custom entries?
1121 MJTI->getEntryKind() == MachineJumpTableInfo::EK_LabelDifference32 ||
1122 // We should also do if the section name is NULL or function is declared
1123 // in discardable section
1124 // FIXME: this isn't the right predicate, should be based on the MCSection
1125 // for the function.
1126 F->isWeakForLinker()) {
1127 OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F,Mang,TM));
1129 // Otherwise, drop it in the readonly section.
1130 const MCSection *ReadOnlySection =
1131 getObjFileLowering().getSectionForConstant(SectionKind::getReadOnly());
1132 OutStreamer.SwitchSection(ReadOnlySection);
1133 JTInDiffSection = true;
1136 EmitAlignment(Log2_32(MJTI->getEntryAlignment(*TM.getDataLayout())));
1138 // Jump tables in code sections are marked with a data_region directive
1139 // where that's supported.
1140 if (!JTInDiffSection)
1141 OutStreamer.EmitDataRegion(MCDR_DataRegionJT32);
1143 for (unsigned JTI = 0, e = JT.size(); JTI != e; ++JTI) {
1144 const std::vector<MachineBasicBlock*> &JTBBs = JT[JTI].MBBs;
1146 // If this jump table was deleted, ignore it.
1147 if (JTBBs.empty()) continue;
1149 // For the EK_LabelDifference32 entry, if the target supports .set, emit a
1150 // .set directive for each unique entry. This reduces the number of
1151 // relocations the assembler will generate for the jump table.
1152 if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_LabelDifference32 &&
1153 MAI->hasSetDirective()) {
1154 SmallPtrSet<const MachineBasicBlock*, 16> EmittedSets;
1155 const TargetLowering *TLI = TM.getTargetLowering();
1156 const MCExpr *Base = TLI->getPICJumpTableRelocBaseExpr(MF,JTI,OutContext);
1157 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
1158 const MachineBasicBlock *MBB = JTBBs[ii];
1159 if (!EmittedSets.insert(MBB)) continue;
1161 // .set LJTSet, LBB32-base
1163 MCSymbolRefExpr::Create(MBB->getSymbol(), OutContext);
1164 OutStreamer.EmitAssignment(GetJTSetSymbol(JTI, MBB->getNumber()),
1165 MCBinaryExpr::CreateSub(LHS, Base, OutContext));
1169 // On some targets (e.g. Darwin) we want to emit two consecutive labels
1170 // before each jump table. The first label is never referenced, but tells
1171 // the assembler and linker the extents of the jump table object. The
1172 // second label is actually referenced by the code.
1173 if (JTInDiffSection && DL->hasLinkerPrivateGlobalPrefix())
1174 // FIXME: This doesn't have to have any specific name, just any randomly
1175 // named and numbered 'l' label would work. Simplify GetJTISymbol.
1176 OutStreamer.EmitLabel(GetJTISymbol(JTI, true));
1178 OutStreamer.EmitLabel(GetJTISymbol(JTI));
1180 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
1181 EmitJumpTableEntry(MJTI, JTBBs[ii], JTI);
1183 if (!JTInDiffSection)
1184 OutStreamer.EmitDataRegion(MCDR_DataRegionEnd);
1187 /// EmitJumpTableEntry - Emit a jump table entry for the specified MBB to the
1189 void AsmPrinter::EmitJumpTableEntry(const MachineJumpTableInfo *MJTI,
1190 const MachineBasicBlock *MBB,
1191 unsigned UID) const {
1192 assert(MBB && MBB->getNumber() >= 0 && "Invalid basic block");
1193 const MCExpr *Value = 0;
1194 switch (MJTI->getEntryKind()) {
1195 case MachineJumpTableInfo::EK_Inline:
1196 llvm_unreachable("Cannot emit EK_Inline jump table entry");
1197 case MachineJumpTableInfo::EK_Custom32:
1198 Value = TM.getTargetLowering()->LowerCustomJumpTableEntry(MJTI, MBB, UID,
1201 case MachineJumpTableInfo::EK_BlockAddress:
1202 // EK_BlockAddress - Each entry is a plain address of block, e.g.:
1204 Value = MCSymbolRefExpr::Create(MBB->getSymbol(), OutContext);
1206 case MachineJumpTableInfo::EK_GPRel32BlockAddress: {
1207 // EK_GPRel32BlockAddress - Each entry is an address of block, encoded
1208 // with a relocation as gp-relative, e.g.:
1210 MCSymbol *MBBSym = MBB->getSymbol();
1211 OutStreamer.EmitGPRel32Value(MCSymbolRefExpr::Create(MBBSym, OutContext));
1215 case MachineJumpTableInfo::EK_GPRel64BlockAddress: {
1216 // EK_GPRel64BlockAddress - Each entry is an address of block, encoded
1217 // with a relocation as gp-relative, e.g.:
1219 MCSymbol *MBBSym = MBB->getSymbol();
1220 OutStreamer.EmitGPRel64Value(MCSymbolRefExpr::Create(MBBSym, OutContext));
1224 case MachineJumpTableInfo::EK_LabelDifference32: {
1225 // EK_LabelDifference32 - Each entry is the address of the block minus
1226 // the address of the jump table. This is used for PIC jump tables where
1227 // gprel32 is not supported. e.g.:
1228 // .word LBB123 - LJTI1_2
1229 // If the .set directive is supported, this is emitted as:
1230 // .set L4_5_set_123, LBB123 - LJTI1_2
1231 // .word L4_5_set_123
1233 // If we have emitted set directives for the jump table entries, print
1234 // them rather than the entries themselves. If we're emitting PIC, then
1235 // emit the table entries as differences between two text section labels.
1236 if (MAI->hasSetDirective()) {
1237 // If we used .set, reference the .set's symbol.
1238 Value = MCSymbolRefExpr::Create(GetJTSetSymbol(UID, MBB->getNumber()),
1242 // Otherwise, use the difference as the jump table entry.
1243 Value = MCSymbolRefExpr::Create(MBB->getSymbol(), OutContext);
1244 const MCExpr *JTI = MCSymbolRefExpr::Create(GetJTISymbol(UID), OutContext);
1245 Value = MCBinaryExpr::CreateSub(Value, JTI, OutContext);
1250 assert(Value && "Unknown entry kind!");
1252 unsigned EntrySize = MJTI->getEntrySize(*TM.getDataLayout());
1253 OutStreamer.EmitValue(Value, EntrySize);
1257 /// EmitSpecialLLVMGlobal - Check to see if the specified global is a
1258 /// special global used by LLVM. If so, emit it and return true, otherwise
1259 /// do nothing and return false.
1260 bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
1261 if (GV->getName() == "llvm.used") {
1262 if (MAI->hasNoDeadStrip()) // No need to emit this at all.
1263 EmitLLVMUsedList(cast<ConstantArray>(GV->getInitializer()));
1267 // Ignore debug and non-emitted data. This handles llvm.compiler.used.
1268 if (GV->getSection() == "llvm.metadata" ||
1269 GV->hasAvailableExternallyLinkage())
1272 if (!GV->hasAppendingLinkage()) return false;
1274 assert(GV->hasInitializer() && "Not a special LLVM global!");
1276 if (GV->getName() == "llvm.global_ctors") {
1277 EmitXXStructorList(GV->getInitializer(), /* isCtor */ true);
1279 if (TM.getRelocationModel() == Reloc::Static &&
1280 MAI->hasStaticCtorDtorReferenceInStaticMode()) {
1281 StringRef Sym(".constructors_used");
1282 OutStreamer.EmitSymbolAttribute(OutContext.GetOrCreateSymbol(Sym),
1288 if (GV->getName() == "llvm.global_dtors") {
1289 EmitXXStructorList(GV->getInitializer(), /* isCtor */ false);
1291 if (TM.getRelocationModel() == Reloc::Static &&
1292 MAI->hasStaticCtorDtorReferenceInStaticMode()) {
1293 StringRef Sym(".destructors_used");
1294 OutStreamer.EmitSymbolAttribute(OutContext.GetOrCreateSymbol(Sym),
1303 /// EmitLLVMUsedList - For targets that define a MAI::UsedDirective, mark each
1304 /// global in the specified llvm.used list for which emitUsedDirectiveFor
1305 /// is true, as being used with this directive.
1306 void AsmPrinter::EmitLLVMUsedList(const ConstantArray *InitList) {
1307 // Should be an array of 'i8*'.
1308 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
1309 const GlobalValue *GV =
1310 dyn_cast<GlobalValue>(InitList->getOperand(i)->stripPointerCasts());
1311 if (GV && getObjFileLowering().shouldEmitUsedDirectiveFor(GV, Mang))
1312 OutStreamer.EmitSymbolAttribute(getSymbol(GV), MCSA_NoDeadStrip);
1316 /// EmitXXStructorList - Emit the ctor or dtor list taking into account the init
1318 void AsmPrinter::EmitXXStructorList(const Constant *List, bool isCtor) {
1319 // Should be an array of '{ int, void ()* }' structs. The first value is the
1321 if (!isa<ConstantArray>(List)) return;
1323 // Sanity check the structors list.
1324 const ConstantArray *InitList = dyn_cast<ConstantArray>(List);
1325 if (!InitList) return; // Not an array!
1326 StructType *ETy = dyn_cast<StructType>(InitList->getType()->getElementType());
1327 if (!ETy || ETy->getNumElements() != 2) return; // Not an array of pairs!
1328 if (!isa<IntegerType>(ETy->getTypeAtIndex(0U)) ||
1329 !isa<PointerType>(ETy->getTypeAtIndex(1U))) return; // Not (int, ptr).
1331 // Gather the structors in a form that's convenient for sorting by priority.
1332 typedef std::pair<unsigned, Constant *> Structor;
1333 SmallVector<Structor, 8> Structors;
1334 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
1335 ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i));
1336 if (!CS) continue; // Malformed.
1337 if (CS->getOperand(1)->isNullValue())
1338 break; // Found a null terminator, skip the rest.
1339 ConstantInt *Priority = dyn_cast<ConstantInt>(CS->getOperand(0));
1340 if (!Priority) continue; // Malformed.
1341 Structors.push_back(std::make_pair(Priority->getLimitedValue(65535),
1342 CS->getOperand(1)));
1345 // Emit the function pointers in the target-specific order
1346 const DataLayout *DL = TM.getDataLayout();
1347 unsigned Align = Log2_32(DL->getPointerPrefAlignment());
1348 std::stable_sort(Structors.begin(), Structors.end(), less_first());
1349 for (unsigned i = 0, e = Structors.size(); i != e; ++i) {
1350 const MCSection *OutputSection =
1352 getObjFileLowering().getStaticCtorSection(Structors[i].first) :
1353 getObjFileLowering().getStaticDtorSection(Structors[i].first));
1354 OutStreamer.SwitchSection(OutputSection);
1355 if (OutStreamer.getCurrentSection() != OutStreamer.getPreviousSection())
1356 EmitAlignment(Align);
1357 EmitXXStructor(Structors[i].second);
1361 void AsmPrinter::EmitModuleIdents(Module &M) {
1362 if (!MAI->hasIdentDirective())
1365 if (const NamedMDNode *NMD = M.getNamedMetadata("llvm.ident")) {
1366 for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) {
1367 const MDNode *N = NMD->getOperand(i);
1368 assert(N->getNumOperands() == 1 &&
1369 "llvm.ident metadata entry can have only one operand");
1370 const MDString *S = cast<MDString>(N->getOperand(0));
1371 OutStreamer.EmitIdent(S->getString());
1376 //===--------------------------------------------------------------------===//
1377 // Emission and print routines
1380 /// EmitInt8 - Emit a byte directive and value.
1382 void AsmPrinter::EmitInt8(int Value) const {
1383 OutStreamer.EmitIntValue(Value, 1);
1386 /// EmitInt16 - Emit a short directive and value.
1388 void AsmPrinter::EmitInt16(int Value) const {
1389 OutStreamer.EmitIntValue(Value, 2);
1392 /// EmitInt32 - Emit a long directive and value.
1394 void AsmPrinter::EmitInt32(int Value) const {
1395 OutStreamer.EmitIntValue(Value, 4);
1398 /// EmitLabelDifference - Emit something like ".long Hi-Lo" where the size
1399 /// in bytes of the directive is specified by Size and Hi/Lo specify the
1400 /// labels. This implicitly uses .set if it is available.
1401 void AsmPrinter::EmitLabelDifference(const MCSymbol *Hi, const MCSymbol *Lo,
1402 unsigned Size) const {
1403 // Get the Hi-Lo expression.
1404 const MCExpr *Diff =
1405 MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(Hi, OutContext),
1406 MCSymbolRefExpr::Create(Lo, OutContext),
1409 if (!MAI->hasSetDirective()) {
1410 OutStreamer.EmitValue(Diff, Size);
1414 // Otherwise, emit with .set (aka assignment).
1415 MCSymbol *SetLabel = GetTempSymbol("set", SetCounter++);
1416 OutStreamer.EmitAssignment(SetLabel, Diff);
1417 OutStreamer.EmitSymbolValue(SetLabel, Size);
1420 /// EmitLabelOffsetDifference - Emit something like ".long Hi+Offset-Lo"
1421 /// where the size in bytes of the directive is specified by Size and Hi/Lo
1422 /// specify the labels. This implicitly uses .set if it is available.
1423 void AsmPrinter::EmitLabelOffsetDifference(const MCSymbol *Hi, uint64_t Offset,
1425 unsigned Size) const {
1427 // Emit Hi+Offset - Lo
1428 // Get the Hi+Offset expression.
1429 const MCExpr *Plus =
1430 MCBinaryExpr::CreateAdd(MCSymbolRefExpr::Create(Hi, OutContext),
1431 MCConstantExpr::Create(Offset, OutContext),
1434 // Get the Hi+Offset-Lo expression.
1435 const MCExpr *Diff =
1436 MCBinaryExpr::CreateSub(Plus,
1437 MCSymbolRefExpr::Create(Lo, OutContext),
1440 if (!MAI->hasSetDirective())
1441 OutStreamer.EmitValue(Diff, Size);
1443 // Otherwise, emit with .set (aka assignment).
1444 MCSymbol *SetLabel = GetTempSymbol("set", SetCounter++);
1445 OutStreamer.EmitAssignment(SetLabel, Diff);
1446 OutStreamer.EmitSymbolValue(SetLabel, Size);
1450 /// EmitLabelPlusOffset - Emit something like ".long Label+Offset"
1451 /// where the size in bytes of the directive is specified by Size and Label
1452 /// specifies the label. This implicitly uses .set if it is available.
1453 void AsmPrinter::EmitLabelPlusOffset(const MCSymbol *Label, uint64_t Offset,
1455 bool IsSectionRelative) const {
1456 if (MAI->needsDwarfSectionOffsetDirective() && IsSectionRelative) {
1457 OutStreamer.EmitCOFFSecRel32(Label);
1461 // Emit Label+Offset (or just Label if Offset is zero)
1462 const MCExpr *Expr = MCSymbolRefExpr::Create(Label, OutContext);
1464 Expr = MCBinaryExpr::CreateAdd(
1465 Expr, MCConstantExpr::Create(Offset, OutContext), OutContext);
1467 OutStreamer.EmitValue(Expr, Size);
1470 //===----------------------------------------------------------------------===//
1472 // EmitAlignment - Emit an alignment directive to the specified power of
1473 // two boundary. For example, if you pass in 3 here, you will get an 8
1474 // byte alignment. If a global value is specified, and if that global has
1475 // an explicit alignment requested, it will override the alignment request
1476 // if required for correctness.
1478 void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV) const {
1479 if (GV) NumBits = getGVAlignmentLog2(GV, *TM.getDataLayout(), NumBits);
1481 if (NumBits == 0) return; // 1-byte aligned: no need to emit alignment.
1483 if (getCurrentSection()->getKind().isText())
1484 OutStreamer.EmitCodeAlignment(1 << NumBits);
1486 OutStreamer.EmitValueToAlignment(1 << NumBits, 0, 1, 0);
1489 //===----------------------------------------------------------------------===//
1490 // Constant emission.
1491 //===----------------------------------------------------------------------===//
1493 /// lowerConstant - Lower the specified LLVM Constant to an MCExpr.
1495 static const MCExpr *lowerConstant(const Constant *CV, AsmPrinter &AP) {
1496 MCContext &Ctx = AP.OutContext;
1498 if (CV->isNullValue() || isa<UndefValue>(CV))
1499 return MCConstantExpr::Create(0, Ctx);
1501 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV))
1502 return MCConstantExpr::Create(CI->getZExtValue(), Ctx);
1504 if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV))
1505 return MCSymbolRefExpr::Create(AP.getSymbol(GV), Ctx);
1507 if (const BlockAddress *BA = dyn_cast<BlockAddress>(CV))
1508 return MCSymbolRefExpr::Create(AP.GetBlockAddressSymbol(BA), Ctx);
1510 const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV);
1512 llvm_unreachable("Unknown constant value to lower!");
1515 if (const MCExpr *RelocExpr =
1516 AP.getObjFileLowering().getExecutableRelativeSymbol(CE, AP.Mang))
1519 switch (CE->getOpcode()) {
1521 // If the code isn't optimized, there may be outstanding folding
1522 // opportunities. Attempt to fold the expression using DataLayout as a
1523 // last resort before giving up.
1525 ConstantFoldConstantExpression(CE, AP.TM.getDataLayout()))
1527 return lowerConstant(C, AP);
1529 // Otherwise report the problem to the user.
1532 raw_string_ostream OS(S);
1533 OS << "Unsupported expression in static initializer: ";
1534 CE->printAsOperand(OS, /*PrintType=*/false,
1535 !AP.MF ? 0 : AP.MF->getFunction()->getParent());
1536 report_fatal_error(OS.str());
1538 case Instruction::GetElementPtr: {
1539 const DataLayout &DL = *AP.TM.getDataLayout();
1540 // Generate a symbolic expression for the byte address
1541 APInt OffsetAI(DL.getPointerTypeSizeInBits(CE->getType()), 0);
1542 cast<GEPOperator>(CE)->accumulateConstantOffset(DL, OffsetAI);
1544 const MCExpr *Base = lowerConstant(CE->getOperand(0), AP);
1548 int64_t Offset = OffsetAI.getSExtValue();
1549 return MCBinaryExpr::CreateAdd(Base, MCConstantExpr::Create(Offset, Ctx),
1553 case Instruction::Trunc:
1554 // We emit the value and depend on the assembler to truncate the generated
1555 // expression properly. This is important for differences between
1556 // blockaddress labels. Since the two labels are in the same function, it
1557 // is reasonable to treat their delta as a 32-bit value.
1559 case Instruction::BitCast:
1560 return lowerConstant(CE->getOperand(0), AP);
1562 case Instruction::IntToPtr: {
1563 const DataLayout &DL = *AP.TM.getDataLayout();
1564 // Handle casts to pointers by changing them into casts to the appropriate
1565 // integer type. This promotes constant folding and simplifies this code.
1566 Constant *Op = CE->getOperand(0);
1567 Op = ConstantExpr::getIntegerCast(Op, DL.getIntPtrType(CV->getType()),
1569 return lowerConstant(Op, AP);
1572 case Instruction::PtrToInt: {
1573 const DataLayout &DL = *AP.TM.getDataLayout();
1574 // Support only foldable casts to/from pointers that can be eliminated by
1575 // changing the pointer to the appropriately sized integer type.
1576 Constant *Op = CE->getOperand(0);
1577 Type *Ty = CE->getType();
1579 const MCExpr *OpExpr = lowerConstant(Op, AP);
1581 // We can emit the pointer value into this slot if the slot is an
1582 // integer slot equal to the size of the pointer.
1583 if (DL.getTypeAllocSize(Ty) == DL.getTypeAllocSize(Op->getType()))
1586 // Otherwise the pointer is smaller than the resultant integer, mask off
1587 // the high bits so we are sure to get a proper truncation if the input is
1589 unsigned InBits = DL.getTypeAllocSizeInBits(Op->getType());
1590 const MCExpr *MaskExpr = MCConstantExpr::Create(~0ULL >> (64-InBits), Ctx);
1591 return MCBinaryExpr::CreateAnd(OpExpr, MaskExpr, Ctx);
1594 // The MC library also has a right-shift operator, but it isn't consistently
1595 // signed or unsigned between different targets.
1596 case Instruction::Add:
1597 case Instruction::Sub:
1598 case Instruction::Mul:
1599 case Instruction::SDiv:
1600 case Instruction::SRem:
1601 case Instruction::Shl:
1602 case Instruction::And:
1603 case Instruction::Or:
1604 case Instruction::Xor: {
1605 const MCExpr *LHS = lowerConstant(CE->getOperand(0), AP);
1606 const MCExpr *RHS = lowerConstant(CE->getOperand(1), AP);
1607 switch (CE->getOpcode()) {
1608 default: llvm_unreachable("Unknown binary operator constant cast expr");
1609 case Instruction::Add: return MCBinaryExpr::CreateAdd(LHS, RHS, Ctx);
1610 case Instruction::Sub: return MCBinaryExpr::CreateSub(LHS, RHS, Ctx);
1611 case Instruction::Mul: return MCBinaryExpr::CreateMul(LHS, RHS, Ctx);
1612 case Instruction::SDiv: return MCBinaryExpr::CreateDiv(LHS, RHS, Ctx);
1613 case Instruction::SRem: return MCBinaryExpr::CreateMod(LHS, RHS, Ctx);
1614 case Instruction::Shl: return MCBinaryExpr::CreateShl(LHS, RHS, Ctx);
1615 case Instruction::And: return MCBinaryExpr::CreateAnd(LHS, RHS, Ctx);
1616 case Instruction::Or: return MCBinaryExpr::CreateOr (LHS, RHS, Ctx);
1617 case Instruction::Xor: return MCBinaryExpr::CreateXor(LHS, RHS, Ctx);
1623 static void emitGlobalConstantImpl(const Constant *C, AsmPrinter &AP);
1625 /// isRepeatedByteSequence - Determine whether the given value is
1626 /// composed of a repeated sequence of identical bytes and return the
1627 /// byte value. If it is not a repeated sequence, return -1.
1628 static int isRepeatedByteSequence(const ConstantDataSequential *V) {
1629 StringRef Data = V->getRawDataValues();
1630 assert(!Data.empty() && "Empty aggregates should be CAZ node");
1632 for (unsigned i = 1, e = Data.size(); i != e; ++i)
1633 if (Data[i] != C) return -1;
1634 return static_cast<uint8_t>(C); // Ensure 255 is not returned as -1.
1638 /// isRepeatedByteSequence - Determine whether the given value is
1639 /// composed of a repeated sequence of identical bytes and return the
1640 /// byte value. If it is not a repeated sequence, return -1.
1641 static int isRepeatedByteSequence(const Value *V, TargetMachine &TM) {
1643 if (const ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
1644 if (CI->getBitWidth() > 64) return -1;
1646 uint64_t Size = TM.getDataLayout()->getTypeAllocSize(V->getType());
1647 uint64_t Value = CI->getZExtValue();
1649 // Make sure the constant is at least 8 bits long and has a power
1650 // of 2 bit width. This guarantees the constant bit width is
1651 // always a multiple of 8 bits, avoiding issues with padding out
1652 // to Size and other such corner cases.
1653 if (CI->getBitWidth() < 8 || !isPowerOf2_64(CI->getBitWidth())) return -1;
1655 uint8_t Byte = static_cast<uint8_t>(Value);
1657 for (unsigned i = 1; i < Size; ++i) {
1659 if (static_cast<uint8_t>(Value) != Byte) return -1;
1663 if (const ConstantArray *CA = dyn_cast<ConstantArray>(V)) {
1664 // Make sure all array elements are sequences of the same repeated
1666 assert(CA->getNumOperands() != 0 && "Should be a CAZ");
1667 int Byte = isRepeatedByteSequence(CA->getOperand(0), TM);
1668 if (Byte == -1) return -1;
1670 for (unsigned i = 1, e = CA->getNumOperands(); i != e; ++i) {
1671 int ThisByte = isRepeatedByteSequence(CA->getOperand(i), TM);
1672 if (ThisByte == -1) return -1;
1673 if (Byte != ThisByte) return -1;
1678 if (const ConstantDataSequential *CDS = dyn_cast<ConstantDataSequential>(V))
1679 return isRepeatedByteSequence(CDS);
1684 static void emitGlobalConstantDataSequential(const ConstantDataSequential *CDS,
1687 // See if we can aggregate this into a .fill, if so, emit it as such.
1688 int Value = isRepeatedByteSequence(CDS, AP.TM);
1690 uint64_t Bytes = AP.TM.getDataLayout()->getTypeAllocSize(CDS->getType());
1691 // Don't emit a 1-byte object as a .fill.
1693 return AP.OutStreamer.EmitFill(Bytes, Value);
1696 // If this can be emitted with .ascii/.asciz, emit it as such.
1697 if (CDS->isString())
1698 return AP.OutStreamer.EmitBytes(CDS->getAsString());
1700 // Otherwise, emit the values in successive locations.
1701 unsigned ElementByteSize = CDS->getElementByteSize();
1702 if (isa<IntegerType>(CDS->getElementType())) {
1703 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) {
1705 AP.OutStreamer.GetCommentOS() << format("0x%" PRIx64 "\n",
1706 CDS->getElementAsInteger(i));
1707 AP.OutStreamer.EmitIntValue(CDS->getElementAsInteger(i),
1710 } else if (ElementByteSize == 4) {
1711 // FP Constants are printed as integer constants to avoid losing
1713 assert(CDS->getElementType()->isFloatTy());
1714 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) {
1720 F = CDS->getElementAsFloat(i);
1722 AP.OutStreamer.GetCommentOS() << "float " << F << '\n';
1723 AP.OutStreamer.EmitIntValue(I, 4);
1726 assert(CDS->getElementType()->isDoubleTy());
1727 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) {
1733 F = CDS->getElementAsDouble(i);
1735 AP.OutStreamer.GetCommentOS() << "double " << F << '\n';
1736 AP.OutStreamer.EmitIntValue(I, 8);
1740 const DataLayout &DL = *AP.TM.getDataLayout();
1741 unsigned Size = DL.getTypeAllocSize(CDS->getType());
1742 unsigned EmittedSize = DL.getTypeAllocSize(CDS->getType()->getElementType()) *
1743 CDS->getNumElements();
1744 if (unsigned Padding = Size - EmittedSize)
1745 AP.OutStreamer.EmitZeros(Padding);
1749 static void emitGlobalConstantArray(const ConstantArray *CA, AsmPrinter &AP) {
1750 // See if we can aggregate some values. Make sure it can be
1751 // represented as a series of bytes of the constant value.
1752 int Value = isRepeatedByteSequence(CA, AP.TM);
1755 uint64_t Bytes = AP.TM.getDataLayout()->getTypeAllocSize(CA->getType());
1756 AP.OutStreamer.EmitFill(Bytes, Value);
1759 for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i)
1760 emitGlobalConstantImpl(CA->getOperand(i), AP);
1764 static void emitGlobalConstantVector(const ConstantVector *CV, AsmPrinter &AP) {
1765 for (unsigned i = 0, e = CV->getType()->getNumElements(); i != e; ++i)
1766 emitGlobalConstantImpl(CV->getOperand(i), AP);
1768 const DataLayout &DL = *AP.TM.getDataLayout();
1769 unsigned Size = DL.getTypeAllocSize(CV->getType());
1770 unsigned EmittedSize = DL.getTypeAllocSize(CV->getType()->getElementType()) *
1771 CV->getType()->getNumElements();
1772 if (unsigned Padding = Size - EmittedSize)
1773 AP.OutStreamer.EmitZeros(Padding);
1776 static void emitGlobalConstantStruct(const ConstantStruct *CS, AsmPrinter &AP) {
1777 // Print the fields in successive locations. Pad to align if needed!
1778 const DataLayout *DL = AP.TM.getDataLayout();
1779 unsigned Size = DL->getTypeAllocSize(CS->getType());
1780 const StructLayout *Layout = DL->getStructLayout(CS->getType());
1781 uint64_t SizeSoFar = 0;
1782 for (unsigned i = 0, e = CS->getNumOperands(); i != e; ++i) {
1783 const Constant *Field = CS->getOperand(i);
1785 // Check if padding is needed and insert one or more 0s.
1786 uint64_t FieldSize = DL->getTypeAllocSize(Field->getType());
1787 uint64_t PadSize = ((i == e-1 ? Size : Layout->getElementOffset(i+1))
1788 - Layout->getElementOffset(i)) - FieldSize;
1789 SizeSoFar += FieldSize + PadSize;
1791 // Now print the actual field value.
1792 emitGlobalConstantImpl(Field, AP);
1794 // Insert padding - this may include padding to increase the size of the
1795 // current field up to the ABI size (if the struct is not packed) as well
1796 // as padding to ensure that the next field starts at the right offset.
1797 AP.OutStreamer.EmitZeros(PadSize);
1799 assert(SizeSoFar == Layout->getSizeInBytes() &&
1800 "Layout of constant struct may be incorrect!");
1803 static void emitGlobalConstantFP(const ConstantFP *CFP, AsmPrinter &AP) {
1804 APInt API = CFP->getValueAPF().bitcastToAPInt();
1806 // First print a comment with what we think the original floating-point value
1807 // should have been.
1808 if (AP.isVerbose()) {
1809 SmallString<8> StrVal;
1810 CFP->getValueAPF().toString(StrVal);
1812 CFP->getType()->print(AP.OutStreamer.GetCommentOS());
1813 AP.OutStreamer.GetCommentOS() << ' ' << StrVal << '\n';
1816 // Now iterate through the APInt chunks, emitting them in endian-correct
1817 // order, possibly with a smaller chunk at beginning/end (e.g. for x87 80-bit
1819 unsigned NumBytes = API.getBitWidth() / 8;
1820 unsigned TrailingBytes = NumBytes % sizeof(uint64_t);
1821 const uint64_t *p = API.getRawData();
1823 // PPC's long double has odd notions of endianness compared to how LLVM
1824 // handles it: p[0] goes first for *big* endian on PPC.
1825 if (AP.TM.getDataLayout()->isBigEndian() != CFP->getType()->isPPC_FP128Ty()) {
1826 int Chunk = API.getNumWords() - 1;
1829 AP.OutStreamer.EmitIntValue(p[Chunk--], TrailingBytes);
1831 for (; Chunk >= 0; --Chunk)
1832 AP.OutStreamer.EmitIntValue(p[Chunk], sizeof(uint64_t));
1835 for (Chunk = 0; Chunk < NumBytes / sizeof(uint64_t); ++Chunk)
1836 AP.OutStreamer.EmitIntValue(p[Chunk], sizeof(uint64_t));
1839 AP.OutStreamer.EmitIntValue(p[Chunk], TrailingBytes);
1842 // Emit the tail padding for the long double.
1843 const DataLayout &DL = *AP.TM.getDataLayout();
1844 AP.OutStreamer.EmitZeros(DL.getTypeAllocSize(CFP->getType()) -
1845 DL.getTypeStoreSize(CFP->getType()));
1848 static void emitGlobalConstantLargeInt(const ConstantInt *CI, AsmPrinter &AP) {
1849 const DataLayout *DL = AP.TM.getDataLayout();
1850 unsigned BitWidth = CI->getBitWidth();
1852 // Copy the value as we may massage the layout for constants whose bit width
1853 // is not a multiple of 64-bits.
1854 APInt Realigned(CI->getValue());
1855 uint64_t ExtraBits = 0;
1856 unsigned ExtraBitsSize = BitWidth & 63;
1858 if (ExtraBitsSize) {
1859 // The bit width of the data is not a multiple of 64-bits.
1860 // The extra bits are expected to be at the end of the chunk of the memory.
1862 // * Nothing to be done, just record the extra bits to emit.
1864 // * Record the extra bits to emit.
1865 // * Realign the raw data to emit the chunks of 64-bits.
1866 if (DL->isBigEndian()) {
1867 // Basically the structure of the raw data is a chunk of 64-bits cells:
1868 // 0 1 BitWidth / 64
1869 // [chunk1][chunk2] ... [chunkN].
1870 // The most significant chunk is chunkN and it should be emitted first.
1871 // However, due to the alignment issue chunkN contains useless bits.
1872 // Realign the chunks so that they contain only useless information:
1873 // ExtraBits 0 1 (BitWidth / 64) - 1
1874 // chu[nk1 chu][nk2 chu] ... [nkN-1 chunkN]
1875 ExtraBits = Realigned.getRawData()[0] &
1876 (((uint64_t)-1) >> (64 - ExtraBitsSize));
1877 Realigned = Realigned.lshr(ExtraBitsSize);
1879 ExtraBits = Realigned.getRawData()[BitWidth / 64];
1882 // We don't expect assemblers to support integer data directives
1883 // for more than 64 bits, so we emit the data in at most 64-bit
1884 // quantities at a time.
1885 const uint64_t *RawData = Realigned.getRawData();
1886 for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) {
1887 uint64_t Val = DL->isBigEndian() ? RawData[e - i - 1] : RawData[i];
1888 AP.OutStreamer.EmitIntValue(Val, 8);
1891 if (ExtraBitsSize) {
1892 // Emit the extra bits after the 64-bits chunks.
1894 // Emit a directive that fills the expected size.
1895 uint64_t Size = AP.TM.getDataLayout()->getTypeAllocSize(CI->getType());
1896 Size -= (BitWidth / 64) * 8;
1897 assert(Size && Size * 8 >= ExtraBitsSize &&
1898 (ExtraBits & (((uint64_t)-1) >> (64 - ExtraBitsSize)))
1899 == ExtraBits && "Directive too small for extra bits.");
1900 AP.OutStreamer.EmitIntValue(ExtraBits, Size);
1904 static void emitGlobalConstantImpl(const Constant *CV, AsmPrinter &AP) {
1905 const DataLayout *DL = AP.TM.getDataLayout();
1906 uint64_t Size = DL->getTypeAllocSize(CV->getType());
1907 if (isa<ConstantAggregateZero>(CV) || isa<UndefValue>(CV))
1908 return AP.OutStreamer.EmitZeros(Size);
1910 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
1917 AP.OutStreamer.GetCommentOS() << format("0x%" PRIx64 "\n",
1918 CI->getZExtValue());
1919 AP.OutStreamer.EmitIntValue(CI->getZExtValue(), Size);
1922 emitGlobalConstantLargeInt(CI, AP);
1927 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV))
1928 return emitGlobalConstantFP(CFP, AP);
1930 if (isa<ConstantPointerNull>(CV)) {
1931 AP.OutStreamer.EmitIntValue(0, Size);
1935 if (const ConstantDataSequential *CDS = dyn_cast<ConstantDataSequential>(CV))
1936 return emitGlobalConstantDataSequential(CDS, AP);
1938 if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV))
1939 return emitGlobalConstantArray(CVA, AP);
1941 if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV))
1942 return emitGlobalConstantStruct(CVS, AP);
1944 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) {
1945 // Look through bitcasts, which might not be able to be MCExpr'ized (e.g. of
1947 if (CE->getOpcode() == Instruction::BitCast)
1948 return emitGlobalConstantImpl(CE->getOperand(0), AP);
1951 // If the constant expression's size is greater than 64-bits, then we have
1952 // to emit the value in chunks. Try to constant fold the value and emit it
1954 Constant *New = ConstantFoldConstantExpression(CE, DL);
1955 if (New && New != CE)
1956 return emitGlobalConstantImpl(New, AP);
1960 if (const ConstantVector *V = dyn_cast<ConstantVector>(CV))
1961 return emitGlobalConstantVector(V, AP);
1963 // Otherwise, it must be a ConstantExpr. Lower it to an MCExpr, then emit it
1964 // thread the streamer with EmitValue.
1965 AP.OutStreamer.EmitValue(lowerConstant(CV, AP), Size);
1968 /// EmitGlobalConstant - Print a general LLVM constant to the .s file.
1969 void AsmPrinter::EmitGlobalConstant(const Constant *CV) {
1970 uint64_t Size = TM.getDataLayout()->getTypeAllocSize(CV->getType());
1972 emitGlobalConstantImpl(CV, *this);
1973 else if (MAI->hasSubsectionsViaSymbols()) {
1974 // If the global has zero size, emit a single byte so that two labels don't
1975 // look like they are at the same location.
1976 OutStreamer.EmitIntValue(0, 1);
1980 void AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
1981 // Target doesn't support this yet!
1982 llvm_unreachable("Target does not support EmitMachineConstantPoolValue");
1985 void AsmPrinter::printOffset(int64_t Offset, raw_ostream &OS) const {
1987 OS << '+' << Offset;
1988 else if (Offset < 0)
1992 //===----------------------------------------------------------------------===//
1993 // Symbol Lowering Routines.
1994 //===----------------------------------------------------------------------===//
1996 /// GetTempSymbol - Return the MCSymbol corresponding to the assembler
1997 /// temporary label with the specified stem and unique ID.
1998 MCSymbol *AsmPrinter::GetTempSymbol(StringRef Name, unsigned ID) const {
1999 const DataLayout *DL = TM.getDataLayout();
2000 return OutContext.GetOrCreateSymbol(Twine(DL->getPrivateGlobalPrefix()) +
2004 /// GetTempSymbol - Return an assembler temporary label with the specified
2006 MCSymbol *AsmPrinter::GetTempSymbol(StringRef Name) const {
2007 const DataLayout *DL = TM.getDataLayout();
2008 return OutContext.GetOrCreateSymbol(Twine(DL->getPrivateGlobalPrefix())+
2013 MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BlockAddress *BA) const {
2014 return MMI->getAddrLabelSymbol(BA->getBasicBlock());
2017 MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BasicBlock *BB) const {
2018 return MMI->getAddrLabelSymbol(BB);
2021 /// GetCPISymbol - Return the symbol for the specified constant pool entry.
2022 MCSymbol *AsmPrinter::GetCPISymbol(unsigned CPID) const {
2023 const DataLayout *DL = TM.getDataLayout();
2024 return OutContext.GetOrCreateSymbol
2025 (Twine(DL->getPrivateGlobalPrefix()) + "CPI" + Twine(getFunctionNumber())
2026 + "_" + Twine(CPID));
2029 /// GetJTISymbol - Return the symbol for the specified jump table entry.
2030 MCSymbol *AsmPrinter::GetJTISymbol(unsigned JTID, bool isLinkerPrivate) const {
2031 return MF->getJTISymbol(JTID, OutContext, isLinkerPrivate);
2034 /// GetJTSetSymbol - Return the symbol for the specified jump table .set
2035 /// FIXME: privatize to AsmPrinter.
2036 MCSymbol *AsmPrinter::GetJTSetSymbol(unsigned UID, unsigned MBBID) const {
2037 const DataLayout *DL = TM.getDataLayout();
2038 return OutContext.GetOrCreateSymbol
2039 (Twine(DL->getPrivateGlobalPrefix()) + Twine(getFunctionNumber()) + "_" +
2040 Twine(UID) + "_set_" + Twine(MBBID));
2043 MCSymbol *AsmPrinter::getSymbolWithGlobalValueBase(const GlobalValue *GV,
2044 StringRef Suffix) const {
2045 return getObjFileLowering().getSymbolWithGlobalValueBase(*Mang, GV, Suffix);
2048 /// GetExternalSymbolSymbol - Return the MCSymbol for the specified
2050 MCSymbol *AsmPrinter::GetExternalSymbolSymbol(StringRef Sym) const {
2051 SmallString<60> NameStr;
2052 Mang->getNameWithPrefix(NameStr, Sym);
2053 return OutContext.GetOrCreateSymbol(NameStr.str());
2058 /// PrintParentLoopComment - Print comments about parent loops of this one.
2059 static void PrintParentLoopComment(raw_ostream &OS, const MachineLoop *Loop,
2060 unsigned FunctionNumber) {
2061 if (Loop == 0) return;
2062 PrintParentLoopComment(OS, Loop->getParentLoop(), FunctionNumber);
2063 OS.indent(Loop->getLoopDepth()*2)
2064 << "Parent Loop BB" << FunctionNumber << "_"
2065 << Loop->getHeader()->getNumber()
2066 << " Depth=" << Loop->getLoopDepth() << '\n';
2070 /// PrintChildLoopComment - Print comments about child loops within
2071 /// the loop for this basic block, with nesting.
2072 static void PrintChildLoopComment(raw_ostream &OS, const MachineLoop *Loop,
2073 unsigned FunctionNumber) {
2074 // Add child loop information
2075 for (MachineLoop::iterator CL = Loop->begin(), E = Loop->end();CL != E; ++CL){
2076 OS.indent((*CL)->getLoopDepth()*2)
2077 << "Child Loop BB" << FunctionNumber << "_"
2078 << (*CL)->getHeader()->getNumber() << " Depth " << (*CL)->getLoopDepth()
2080 PrintChildLoopComment(OS, *CL, FunctionNumber);
2084 /// emitBasicBlockLoopComments - Pretty-print comments for basic blocks.
2085 static void emitBasicBlockLoopComments(const MachineBasicBlock &MBB,
2086 const MachineLoopInfo *LI,
2087 const AsmPrinter &AP) {
2088 // Add loop depth information
2089 const MachineLoop *Loop = LI->getLoopFor(&MBB);
2090 if (Loop == 0) return;
2092 MachineBasicBlock *Header = Loop->getHeader();
2093 assert(Header && "No header for loop");
2095 // If this block is not a loop header, just print out what is the loop header
2097 if (Header != &MBB) {
2098 AP.OutStreamer.AddComment(" in Loop: Header=BB" +
2099 Twine(AP.getFunctionNumber())+"_" +
2100 Twine(Loop->getHeader()->getNumber())+
2101 " Depth="+Twine(Loop->getLoopDepth()));
2105 // Otherwise, it is a loop header. Print out information about child and
2107 raw_ostream &OS = AP.OutStreamer.GetCommentOS();
2109 PrintParentLoopComment(OS, Loop->getParentLoop(), AP.getFunctionNumber());
2112 OS.indent(Loop->getLoopDepth()*2-2);
2117 OS << "Loop Header: Depth=" + Twine(Loop->getLoopDepth()) << '\n';
2119 PrintChildLoopComment(OS, Loop, AP.getFunctionNumber());
2123 /// EmitBasicBlockStart - This method prints the label for the specified
2124 /// MachineBasicBlock, an alignment (if present) and a comment describing
2125 /// it if appropriate.
2126 void AsmPrinter::EmitBasicBlockStart(const MachineBasicBlock *MBB) const {
2127 // Emit an alignment directive for this block, if needed.
2128 if (unsigned Align = MBB->getAlignment())
2129 EmitAlignment(Align);
2131 // If the block has its address taken, emit any labels that were used to
2132 // reference the block. It is possible that there is more than one label
2133 // here, because multiple LLVM BB's may have been RAUW'd to this block after
2134 // the references were generated.
2135 if (MBB->hasAddressTaken()) {
2136 const BasicBlock *BB = MBB->getBasicBlock();
2138 OutStreamer.AddComment("Block address taken");
2140 std::vector<MCSymbol*> Syms = MMI->getAddrLabelSymbolToEmit(BB);
2142 for (unsigned i = 0, e = Syms.size(); i != e; ++i)
2143 OutStreamer.EmitLabel(Syms[i]);
2146 // Print some verbose block comments.
2148 if (const BasicBlock *BB = MBB->getBasicBlock())
2150 OutStreamer.AddComment("%" + BB->getName());
2151 emitBasicBlockLoopComments(*MBB, LI, *this);
2154 // Print the main label for the block.
2155 if (MBB->pred_empty() || isBlockOnlyReachableByFallthrough(MBB)) {
2156 if (isVerbose() && OutStreamer.hasRawTextSupport()) {
2157 // NOTE: Want this comment at start of line, don't emit with AddComment.
2158 OutStreamer.emitRawComment(" BB#" + Twine(MBB->getNumber()) + ":", false);
2161 OutStreamer.EmitLabel(MBB->getSymbol());
2165 void AsmPrinter::EmitVisibility(MCSymbol *Sym, unsigned Visibility,
2166 bool IsDefinition) const {
2167 MCSymbolAttr Attr = MCSA_Invalid;
2169 switch (Visibility) {
2171 case GlobalValue::HiddenVisibility:
2173 Attr = MAI->getHiddenVisibilityAttr();
2175 Attr = MAI->getHiddenDeclarationVisibilityAttr();
2177 case GlobalValue::ProtectedVisibility:
2178 Attr = MAI->getProtectedVisibilityAttr();
2182 if (Attr != MCSA_Invalid)
2183 OutStreamer.EmitSymbolAttribute(Sym, Attr);
2186 /// isBlockOnlyReachableByFallthough - Return true if the basic block has
2187 /// exactly one predecessor and the control transfer mechanism between
2188 /// the predecessor and this block is a fall-through.
2190 isBlockOnlyReachableByFallthrough(const MachineBasicBlock *MBB) const {
2191 // If this is a landing pad, it isn't a fall through. If it has no preds,
2192 // then nothing falls through to it.
2193 if (MBB->isLandingPad() || MBB->pred_empty())
2196 // If there isn't exactly one predecessor, it can't be a fall through.
2197 MachineBasicBlock::const_pred_iterator PI = MBB->pred_begin(), PI2 = PI;
2199 if (PI2 != MBB->pred_end())
2202 // The predecessor has to be immediately before this block.
2203 MachineBasicBlock *Pred = *PI;
2205 if (!Pred->isLayoutSuccessor(MBB))
2208 // If the block is completely empty, then it definitely does fall through.
2212 // Check the terminators in the previous blocks
2213 for (MachineBasicBlock::iterator II = Pred->getFirstTerminator(),
2214 IE = Pred->end(); II != IE; ++II) {
2215 MachineInstr &MI = *II;
2217 // If it is not a simple branch, we are in a table somewhere.
2218 if (!MI.isBranch() || MI.isIndirectBranch())
2221 // If we are the operands of one of the branches, this is not a fall
2222 // through. Note that targets with delay slots will usually bundle
2223 // terminators with the delay slot instruction.
2224 for (ConstMIBundleOperands OP(&MI); OP.isValid(); ++OP) {
2227 if (OP->isMBB() && OP->getMBB() == MBB)
2237 GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy *S) {
2238 if (!S->usesMetadata())
2241 gcp_map_type &GCMap = getGCMap(GCMetadataPrinters);
2242 gcp_map_type::iterator GCPI = GCMap.find(S);
2243 if (GCPI != GCMap.end())
2244 return GCPI->second;
2246 const char *Name = S->getName().c_str();
2248 for (GCMetadataPrinterRegistry::iterator
2249 I = GCMetadataPrinterRegistry::begin(),
2250 E = GCMetadataPrinterRegistry::end(); I != E; ++I)
2251 if (strcmp(Name, I->getName()) == 0) {
2252 GCMetadataPrinter *GMP = I->instantiate();
2254 GCMap.insert(std::make_pair(S, GMP));
2258 report_fatal_error("no GCMetadataPrinter registered for GC: " + Twine(Name));
2261 /// Pin vtable to this file.
2262 AsmPrinterHandler::~AsmPrinterHandler() {}