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/Assembly/Writer.h"
22 #include "llvm/CodeGen/GCMetadataPrinter.h"
23 #include "llvm/CodeGen/MachineConstantPool.h"
24 #include "llvm/CodeGen/MachineFrameInfo.h"
25 #include "llvm/CodeGen/MachineFunction.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/Module.h"
32 #include "llvm/IR/Operator.h"
33 #include "llvm/MC/MCAsmInfo.h"
34 #include "llvm/MC/MCContext.h"
35 #include "llvm/MC/MCExpr.h"
36 #include "llvm/MC/MCInst.h"
37 #include "llvm/MC/MCSection.h"
38 #include "llvm/MC/MCStreamer.h"
39 #include "llvm/MC/MCSymbol.h"
40 #include "llvm/Support/ErrorHandling.h"
41 #include "llvm/Support/Format.h"
42 #include "llvm/Support/MathExtras.h"
43 #include "llvm/Support/Timer.h"
44 #include "llvm/Target/Mangler.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"
53 static const char *const DWARFGroupName = "DWARF Emission";
54 static const char *const DbgTimerName = "DWARF Debug Writer";
55 static const char *const EHTimerName = "DWARF Exception Writer";
57 STATISTIC(EmittedInsts, "Number of machine instrs printed");
59 char AsmPrinter::ID = 0;
61 typedef DenseMap<GCStrategy*,GCMetadataPrinter*> gcp_map_type;
62 static gcp_map_type &getGCMap(void *&P) {
64 P = new gcp_map_type();
65 return *(gcp_map_type*)P;
69 /// getGVAlignmentLog2 - Return the alignment to use for the specified global
70 /// value in log2 form. This rounds up to the preferred alignment if possible
72 static unsigned getGVAlignmentLog2(const GlobalValue *GV, const DataLayout &TD,
73 unsigned InBits = 0) {
75 if (const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV))
76 NumBits = TD.getPreferredAlignmentLog(GVar);
78 // If InBits is specified, round it to it.
82 // If the GV has a specified alignment, take it into account.
83 if (GV->getAlignment() == 0)
86 unsigned GVAlign = Log2_32(GV->getAlignment());
88 // If the GVAlign is larger than NumBits, or if we are required to obey
89 // NumBits because the GV has an assigned section, obey it.
90 if (GVAlign > NumBits || GV->hasSection())
95 AsmPrinter::AsmPrinter(TargetMachine &tm, MCStreamer &Streamer)
96 : MachineFunctionPass(ID),
97 TM(tm), MAI(tm.getMCAsmInfo()),
98 OutContext(Streamer.getContext()),
99 OutStreamer(Streamer),
100 LastMI(0), LastFn(0), Counter(~0U), SetCounter(0) {
101 DD = 0; DE = 0; MMI = 0; LI = 0; MF = 0;
102 CurrentFnSym = CurrentFnSymForSize = 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();
132 /// getDataLayout - Return information about data layout.
133 const DataLayout &AsmPrinter::getDataLayout() const {
134 return *TM.getDataLayout();
137 StringRef AsmPrinter::getTargetTriple() const {
138 return TM.getTargetTriple();
141 /// getCurrentSection() - Return the current section we are emitting to.
142 const MCSection *AsmPrinter::getCurrentSection() const {
143 return OutStreamer.getCurrentSection().first;
148 void AsmPrinter::getAnalysisUsage(AnalysisUsage &AU) const {
149 AU.setPreservesAll();
150 MachineFunctionPass::getAnalysisUsage(AU);
151 AU.addRequired<MachineModuleInfo>();
152 AU.addRequired<GCModuleInfo>();
154 AU.addRequired<MachineLoopInfo>();
157 bool AsmPrinter::doInitialization(Module &M) {
158 MMI = getAnalysisIfAvailable<MachineModuleInfo>();
159 MMI->AnalyzeModule(M);
161 // Initialize TargetLoweringObjectFile.
162 const_cast<TargetLoweringObjectFile&>(getObjFileLowering())
163 .Initialize(OutContext, TM);
165 OutStreamer.InitStreamer();
167 Mang = new Mangler(OutContext, &TM);
169 // Allow the target to emit any magic that it wants at the start of the file.
170 EmitStartOfAsmFile(M);
172 // Very minimal debug info. It is ignored if we emit actual debug info. If we
173 // don't, this at least helps the user find where a global came from.
174 if (MAI->hasSingleParameterDotFile()) {
176 OutStreamer.EmitFileDirective(M.getModuleIdentifier());
179 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
180 assert(MI && "AsmPrinter didn't require GCModuleInfo?");
181 for (GCModuleInfo::iterator I = MI->begin(), E = MI->end(); I != E; ++I)
182 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I))
183 MP->beginAssembly(*this);
185 // Emit module-level inline asm if it exists.
186 if (!M.getModuleInlineAsm().empty()) {
187 OutStreamer.AddComment("Start of file scope inline assembly");
188 OutStreamer.AddBlankLine();
189 EmitInlineAsm(M.getModuleInlineAsm()+"\n");
190 OutStreamer.AddComment("End of file scope inline assembly");
191 OutStreamer.AddBlankLine();
194 if (MAI->doesSupportDebugInformation())
195 DD = new DwarfDebug(this, &M);
197 switch (MAI->getExceptionHandlingType()) {
198 case ExceptionHandling::None:
200 case ExceptionHandling::SjLj:
201 case ExceptionHandling::DwarfCFI:
202 DE = new DwarfCFIException(this);
204 case ExceptionHandling::ARM:
205 DE = new ARMException(this);
207 case ExceptionHandling::Win64:
208 DE = new Win64Exception(this);
212 llvm_unreachable("Unknown exception type.");
215 void AsmPrinter::EmitLinkage(unsigned Linkage, MCSymbol *GVSym) const {
216 switch ((GlobalValue::LinkageTypes)Linkage) {
217 case GlobalValue::CommonLinkage:
218 case GlobalValue::LinkOnceAnyLinkage:
219 case GlobalValue::LinkOnceODRLinkage:
220 case GlobalValue::LinkOnceODRAutoHideLinkage:
221 case GlobalValue::WeakAnyLinkage:
222 case GlobalValue::WeakODRLinkage:
223 case GlobalValue::LinkerPrivateWeakLinkage:
224 if (MAI->getWeakDefDirective() != 0) {
226 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
228 if ((GlobalValue::LinkageTypes)Linkage !=
229 GlobalValue::LinkOnceODRAutoHideLinkage)
230 // .weak_definition _foo
231 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_WeakDefinition);
233 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_WeakDefAutoPrivate);
234 } else if (MAI->getLinkOnceDirective() != 0) {
236 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
237 //NOTE: linkonce is handled by the section the symbol was assigned to.
240 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Weak);
243 case GlobalValue::DLLExportLinkage:
244 case GlobalValue::AppendingLinkage:
245 // FIXME: appending linkage variables should go into a section of
246 // their name or something. For now, just emit them as external.
247 case GlobalValue::ExternalLinkage:
248 // If external or appending, declare as a global symbol.
250 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
252 case GlobalValue::PrivateLinkage:
253 case GlobalValue::InternalLinkage:
254 case GlobalValue::LinkerPrivateLinkage:
257 llvm_unreachable("Unknown linkage type!");
262 /// EmitGlobalVariable - Emit the specified global variable to the .s file.
263 void AsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) {
264 if (GV->hasInitializer()) {
265 // Check to see if this is a special global used by LLVM, if so, emit it.
266 if (EmitSpecialLLVMGlobal(GV))
270 WriteAsOperand(OutStreamer.GetCommentOS(), GV,
271 /*PrintType=*/false, GV->getParent());
272 OutStreamer.GetCommentOS() << '\n';
276 MCSymbol *GVSym = Mang->getSymbol(GV);
277 EmitVisibility(GVSym, GV->getVisibility(), !GV->isDeclaration());
279 if (!GV->hasInitializer()) // External globals require no extra code.
282 if (MAI->hasDotTypeDotSizeDirective())
283 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_ELF_TypeObject);
285 SectionKind GVKind = TargetLoweringObjectFile::getKindForGlobal(GV, TM);
287 const DataLayout *TD = TM.getDataLayout();
288 uint64_t Size = TD->getTypeAllocSize(GV->getType()->getElementType());
290 // If the alignment is specified, we *must* obey it. Overaligning a global
291 // with a specified alignment is a prompt way to break globals emitted to
292 // sections and expected to be contiguous (e.g. ObjC metadata).
293 unsigned AlignLog = getGVAlignmentLog2(GV, *TD);
295 // Handle common and BSS local symbols (.lcomm).
296 if (GVKind.isCommon() || GVKind.isBSSLocal()) {
297 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
298 unsigned Align = 1 << AlignLog;
300 // Handle common symbols.
301 if (GVKind.isCommon()) {
302 if (!getObjFileLowering().getCommDirectiveSupportsAlignment())
306 OutStreamer.EmitCommonSymbol(GVSym, Size, Align);
310 // Handle local BSS symbols.
311 if (MAI->hasMachoZeroFillDirective()) {
312 const MCSection *TheSection =
313 getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM);
314 // .zerofill __DATA, __bss, _foo, 400, 5
315 OutStreamer.EmitZerofill(TheSection, GVSym, Size, Align);
319 // Use .lcomm only if it supports user-specified alignment.
320 // Otherwise, while it would still be correct to use .lcomm in some
321 // cases (e.g. when Align == 1), the external assembler might enfore
322 // some -unknown- default alignment behavior, which could cause
323 // spurious differences between external and integrated assembler.
324 // Prefer to simply fall back to .local / .comm in this case.
325 if (MAI->getLCOMMDirectiveAlignmentType() != LCOMM::NoAlignment) {
327 OutStreamer.EmitLocalCommonSymbol(GVSym, Size, Align);
331 if (!getObjFileLowering().getCommDirectiveSupportsAlignment())
335 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Local);
337 OutStreamer.EmitCommonSymbol(GVSym, Size, Align);
341 const MCSection *TheSection =
342 getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM);
344 // Handle the zerofill directive on darwin, which is a special form of BSS
346 if (GVKind.isBSSExtern() && MAI->hasMachoZeroFillDirective()) {
347 if (Size == 0) Size = 1; // zerofill of 0 bytes is undefined.
350 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
351 // .zerofill __DATA, __common, _foo, 400, 5
352 OutStreamer.EmitZerofill(TheSection, GVSym, Size, 1 << AlignLog);
356 // Handle thread local data for mach-o which requires us to output an
357 // additional structure of data and mangle the original symbol so that we
358 // can reference it later.
360 // TODO: This should become an "emit thread local global" method on TLOF.
361 // All of this macho specific stuff should be sunk down into TLOFMachO and
362 // stuff like "TLSExtraDataSection" should no longer be part of the parent
363 // TLOF class. This will also make it more obvious that stuff like
364 // MCStreamer::EmitTBSSSymbol is macho specific and only called from macho
366 if (GVKind.isThreadLocal() && MAI->hasMachoTBSSDirective()) {
367 // Emit the .tbss symbol
369 OutContext.GetOrCreateSymbol(GVSym->getName() + Twine("$tlv$init"));
371 if (GVKind.isThreadBSS())
372 OutStreamer.EmitTBSSSymbol(TheSection, MangSym, Size, 1 << AlignLog);
373 else if (GVKind.isThreadData()) {
374 OutStreamer.SwitchSection(TheSection);
376 EmitAlignment(AlignLog, GV);
377 OutStreamer.EmitLabel(MangSym);
379 EmitGlobalConstant(GV->getInitializer());
382 OutStreamer.AddBlankLine();
384 // Emit the variable struct for the runtime.
385 const MCSection *TLVSect
386 = getObjFileLowering().getTLSExtraDataSection();
388 OutStreamer.SwitchSection(TLVSect);
389 // Emit the linkage here.
390 EmitLinkage(GV->getLinkage(), GVSym);
391 OutStreamer.EmitLabel(GVSym);
393 // Three pointers in size:
394 // - __tlv_bootstrap - used to make sure support exists
395 // - spare pointer, used when mapped by the runtime
396 // - pointer to mangled symbol above with initializer
397 unsigned PtrSize = TD->getPointerSizeInBits()/8;
398 OutStreamer.EmitSymbolValue(GetExternalSymbolSymbol("_tlv_bootstrap"),
400 OutStreamer.EmitIntValue(0, PtrSize);
401 OutStreamer.EmitSymbolValue(MangSym, PtrSize);
403 OutStreamer.AddBlankLine();
407 OutStreamer.SwitchSection(TheSection);
409 EmitLinkage(GV->getLinkage(), GVSym);
410 EmitAlignment(AlignLog, GV);
412 OutStreamer.EmitLabel(GVSym);
414 EmitGlobalConstant(GV->getInitializer());
416 if (MAI->hasDotTypeDotSizeDirective())
418 OutStreamer.EmitELFSize(GVSym, MCConstantExpr::Create(Size, OutContext));
420 OutStreamer.AddBlankLine();
423 /// EmitFunctionHeader - This method emits the header for the current
425 void AsmPrinter::EmitFunctionHeader() {
426 // Print out constants referenced by the function
429 // Print the 'header' of function.
430 const Function *F = MF->getFunction();
432 OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang, TM));
433 EmitVisibility(CurrentFnSym, F->getVisibility());
435 EmitLinkage(F->getLinkage(), CurrentFnSym);
436 EmitAlignment(MF->getAlignment(), F);
438 if (MAI->hasDotTypeDotSizeDirective())
439 OutStreamer.EmitSymbolAttribute(CurrentFnSym, MCSA_ELF_TypeFunction);
442 WriteAsOperand(OutStreamer.GetCommentOS(), F,
443 /*PrintType=*/false, F->getParent());
444 OutStreamer.GetCommentOS() << '\n';
447 // Emit the CurrentFnSym. This is a virtual function to allow targets to
448 // do their wild and crazy things as required.
449 EmitFunctionEntryLabel();
451 // If the function had address-taken blocks that got deleted, then we have
452 // references to the dangling symbols. Emit them at the start of the function
453 // so that we don't get references to undefined symbols.
454 std::vector<MCSymbol*> DeadBlockSyms;
455 MMI->takeDeletedSymbolsForFunction(F, DeadBlockSyms);
456 for (unsigned i = 0, e = DeadBlockSyms.size(); i != e; ++i) {
457 OutStreamer.AddComment("Address taken block that was later removed");
458 OutStreamer.EmitLabel(DeadBlockSyms[i]);
461 // Add some workaround for linkonce linkage on Cygwin\MinGW.
462 if (MAI->getLinkOnceDirective() != 0 &&
463 (F->hasLinkOnceLinkage() || F->hasWeakLinkage())) {
464 // FIXME: What is this?
466 OutContext.GetOrCreateSymbol(Twine("Lllvm$workaround$fake$stub$")+
467 CurrentFnSym->getName());
468 OutStreamer.EmitLabel(FakeStub);
471 // Emit pre-function debug and/or EH information.
473 NamedRegionTimer T(EHTimerName, DWARFGroupName, TimePassesIsEnabled);
474 DE->BeginFunction(MF);
477 NamedRegionTimer T(DbgTimerName, DWARFGroupName, TimePassesIsEnabled);
478 DD->beginFunction(MF);
482 /// EmitFunctionEntryLabel - Emit the label that is the entrypoint for the
483 /// function. This can be overridden by targets as required to do custom stuff.
484 void AsmPrinter::EmitFunctionEntryLabel() {
485 // The function label could have already been emitted if two symbols end up
486 // conflicting due to asm renaming. Detect this and emit an error.
487 if (CurrentFnSym->isUndefined())
488 return OutStreamer.EmitLabel(CurrentFnSym);
490 report_fatal_error("'" + Twine(CurrentFnSym->getName()) +
491 "' label emitted multiple times to assembly file");
494 /// emitComments - Pretty-print comments for instructions.
495 static void emitComments(const MachineInstr &MI, raw_ostream &CommentOS) {
496 const MachineFunction *MF = MI.getParent()->getParent();
497 const TargetMachine &TM = MF->getTarget();
499 // Check for spills and reloads
502 const MachineFrameInfo *FrameInfo = MF->getFrameInfo();
504 // We assume a single instruction only has a spill or reload, not
506 const MachineMemOperand *MMO;
507 if (TM.getInstrInfo()->isLoadFromStackSlotPostFE(&MI, FI)) {
508 if (FrameInfo->isSpillSlotObjectIndex(FI)) {
509 MMO = *MI.memoperands_begin();
510 CommentOS << MMO->getSize() << "-byte Reload\n";
512 } else if (TM.getInstrInfo()->hasLoadFromStackSlot(&MI, MMO, FI)) {
513 if (FrameInfo->isSpillSlotObjectIndex(FI))
514 CommentOS << MMO->getSize() << "-byte Folded Reload\n";
515 } else if (TM.getInstrInfo()->isStoreToStackSlotPostFE(&MI, FI)) {
516 if (FrameInfo->isSpillSlotObjectIndex(FI)) {
517 MMO = *MI.memoperands_begin();
518 CommentOS << MMO->getSize() << "-byte Spill\n";
520 } else if (TM.getInstrInfo()->hasStoreToStackSlot(&MI, MMO, FI)) {
521 if (FrameInfo->isSpillSlotObjectIndex(FI))
522 CommentOS << MMO->getSize() << "-byte Folded Spill\n";
525 // Check for spill-induced copies
526 if (MI.getAsmPrinterFlag(MachineInstr::ReloadReuse))
527 CommentOS << " Reload Reuse\n";
530 /// emitImplicitDef - This method emits the specified machine instruction
531 /// that is an implicit def.
532 static void emitImplicitDef(const MachineInstr *MI, AsmPrinter &AP) {
533 unsigned RegNo = MI->getOperand(0).getReg();
534 AP.OutStreamer.AddComment(Twine("implicit-def: ") +
535 AP.TM.getRegisterInfo()->getName(RegNo));
536 AP.OutStreamer.AddBlankLine();
539 static void emitKill(const MachineInstr *MI, AsmPrinter &AP) {
540 std::string Str = "kill:";
541 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
542 const MachineOperand &Op = MI->getOperand(i);
543 assert(Op.isReg() && "KILL instruction must have only register operands");
545 Str += AP.TM.getRegisterInfo()->getName(Op.getReg());
546 Str += (Op.isDef() ? "<def>" : "<kill>");
548 AP.OutStreamer.AddComment(Str);
549 AP.OutStreamer.AddBlankLine();
552 /// emitDebugValueComment - This method handles the target-independent form
553 /// of DBG_VALUE, returning true if it was able to do so. A false return
554 /// means the target will need to handle MI in EmitInstruction.
555 static bool emitDebugValueComment(const MachineInstr *MI, AsmPrinter &AP) {
556 // This code handles only the 3-operand target-independent form.
557 if (MI->getNumOperands() != 3)
560 SmallString<128> Str;
561 raw_svector_ostream OS(Str);
562 OS << '\t' << AP.MAI->getCommentString() << "DEBUG_VALUE: ";
564 // cast away const; DIetc do not take const operands for some reason.
565 DIVariable V(const_cast<MDNode*>(MI->getOperand(2).getMetadata()));
566 if (V.getContext().isSubprogram()) {
567 StringRef Name = DISubprogram(V.getContext()).getDisplayName();
571 OS << V.getName() << " <- ";
573 // The second operand is only an offset if it's an immediate.
574 bool Deref = MI->getOperand(0).isReg() && MI->getOperand(1).isImm();
575 int64_t Offset = Deref ? MI->getOperand(1).getImm() : 0;
577 // Register or immediate value. Register 0 means undef.
578 if (MI->getOperand(0).isFPImm()) {
579 APFloat APF = APFloat(MI->getOperand(0).getFPImm()->getValueAPF());
580 if (MI->getOperand(0).getFPImm()->getType()->isFloatTy()) {
581 OS << (double)APF.convertToFloat();
582 } else if (MI->getOperand(0).getFPImm()->getType()->isDoubleTy()) {
583 OS << APF.convertToDouble();
585 // There is no good way to print long double. Convert a copy to
586 // double. Ah well, it's only a comment.
588 APF.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven,
590 OS << "(long double) " << APF.convertToDouble();
592 } else if (MI->getOperand(0).isImm()) {
593 OS << MI->getOperand(0).getImm();
594 } else if (MI->getOperand(0).isCImm()) {
595 MI->getOperand(0).getCImm()->getValue().print(OS, false /*isSigned*/);
598 if (MI->getOperand(0).isReg()) {
599 Reg = MI->getOperand(0).getReg();
601 assert(MI->getOperand(0).isFI() && "Unknown operand type");
602 const TargetFrameLowering *TFI = AP.TM.getFrameLowering();
603 Offset += TFI->getFrameIndexReference(*AP.MF,
604 MI->getOperand(0).getIndex(), Reg);
608 // Suppress offset, it is not meaningful here.
610 // NOTE: Want this comment at start of line, don't emit with AddComment.
611 AP.OutStreamer.EmitRawText(OS.str());
616 OS << AP.TM.getRegisterInfo()->getName(Reg);
620 OS << '+' << Offset << ']';
622 // NOTE: Want this comment at start of line, don't emit with AddComment.
623 AP.OutStreamer.EmitRawText(OS.str());
627 AsmPrinter::CFIMoveType AsmPrinter::needsCFIMoves() {
628 if (MAI->getExceptionHandlingType() == ExceptionHandling::DwarfCFI &&
629 MF->getFunction()->needsUnwindTableEntry())
632 if (MMI->hasDebugInfo())
638 bool AsmPrinter::needsSEHMoves() {
639 return MAI->getExceptionHandlingType() == ExceptionHandling::Win64 &&
640 MF->getFunction()->needsUnwindTableEntry();
643 bool AsmPrinter::needsRelocationsForDwarfStringPool() const {
644 return MAI->doesDwarfUseRelocationsAcrossSections();
647 void AsmPrinter::emitPrologLabel(const MachineInstr &MI) {
648 MCSymbol *Label = MI.getOperand(0).getMCSymbol();
650 if (MAI->getExceptionHandlingType() != ExceptionHandling::DwarfCFI)
653 if (needsCFIMoves() == CFI_M_None)
656 if (MMI->getCompactUnwindEncoding() != 0)
657 OutStreamer.EmitCompactUnwindEncoding(MMI->getCompactUnwindEncoding());
659 MachineModuleInfo &MMI = MF->getMMI();
660 std::vector<MCCFIInstruction> Instructions = MMI.getFrameInstructions();
661 bool FoundOne = false;
663 for (std::vector<MCCFIInstruction>::iterator I = Instructions.begin(),
664 E = Instructions.end(); I != E; ++I) {
665 if (I->getLabel() == Label) {
666 emitCFIInstruction(*I);
673 /// EmitFunctionBody - This method emits the body and trailer for a
675 void AsmPrinter::EmitFunctionBody() {
676 // Emit target-specific gunk before the function body.
677 EmitFunctionBodyStart();
679 bool ShouldPrintDebugScopes = DD && MMI->hasDebugInfo();
681 // Print out code for the function.
682 bool HasAnyRealCode = false;
683 const MachineInstr *LastMI = 0;
684 for (MachineFunction::const_iterator I = MF->begin(), E = MF->end();
686 // Print a label for the basic block.
687 EmitBasicBlockStart(I);
688 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
692 // Print the assembly for the instruction.
693 if (!II->isLabel() && !II->isImplicitDef() && !II->isKill() &&
694 !II->isDebugValue()) {
695 HasAnyRealCode = true;
699 if (ShouldPrintDebugScopes) {
700 NamedRegionTimer T(DbgTimerName, DWARFGroupName, TimePassesIsEnabled);
701 DD->beginInstruction(II);
705 emitComments(*II, OutStreamer.GetCommentOS());
707 switch (II->getOpcode()) {
708 case TargetOpcode::PROLOG_LABEL:
709 emitPrologLabel(*II);
712 case TargetOpcode::EH_LABEL:
713 case TargetOpcode::GC_LABEL:
714 OutStreamer.EmitLabel(II->getOperand(0).getMCSymbol());
716 case TargetOpcode::INLINEASM:
719 case TargetOpcode::DBG_VALUE:
721 if (!emitDebugValueComment(II, *this))
725 case TargetOpcode::IMPLICIT_DEF:
726 if (isVerbose()) emitImplicitDef(II, *this);
728 case TargetOpcode::KILL:
729 if (isVerbose()) emitKill(II, *this);
732 if (!TM.hasMCUseLoc())
733 MCLineEntry::Make(&OutStreamer, getCurrentSection());
739 if (ShouldPrintDebugScopes) {
740 NamedRegionTimer T(DbgTimerName, DWARFGroupName, TimePassesIsEnabled);
741 DD->endInstruction(II);
746 // If the last instruction was a prolog label, then we have a situation where
747 // we emitted a prolog but no function body. This results in the ending prolog
748 // label equaling the end of function label and an invalid "row" in the
749 // FDE. We need to emit a noop in this situation so that the FDE's rows are
751 bool RequiresNoop = LastMI && LastMI->isPrologLabel();
753 // If the function is empty and the object file uses .subsections_via_symbols,
754 // then we need to emit *something* to the function body to prevent the
755 // labels from collapsing together. Just emit a noop.
756 if ((MAI->hasSubsectionsViaSymbols() && !HasAnyRealCode) || RequiresNoop) {
758 TM.getInstrInfo()->getNoopForMachoTarget(Noop);
759 if (Noop.getOpcode()) {
760 OutStreamer.AddComment("avoids zero-length function");
761 OutStreamer.EmitInstruction(Noop);
762 } else // Target not mc-ized yet.
763 OutStreamer.EmitRawText(StringRef("\tnop\n"));
766 const Function *F = MF->getFunction();
767 for (Function::const_iterator i = F->begin(), e = F->end(); i != e; ++i) {
768 const BasicBlock *BB = i;
769 if (!BB->hasAddressTaken())
771 MCSymbol *Sym = GetBlockAddressSymbol(BB);
772 if (Sym->isDefined())
774 OutStreamer.AddComment("Address of block that was removed by CodeGen");
775 OutStreamer.EmitLabel(Sym);
778 // Emit target-specific gunk after the function body.
779 EmitFunctionBodyEnd();
781 // If the target wants a .size directive for the size of the function, emit
783 if (MAI->hasDotTypeDotSizeDirective()) {
784 // Create a symbol for the end of function, so we can get the size as
785 // difference between the function label and the temp label.
786 MCSymbol *FnEndLabel = OutContext.CreateTempSymbol();
787 OutStreamer.EmitLabel(FnEndLabel);
789 const MCExpr *SizeExp =
790 MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(FnEndLabel, OutContext),
791 MCSymbolRefExpr::Create(CurrentFnSymForSize,
794 OutStreamer.EmitELFSize(CurrentFnSym, SizeExp);
797 // Emit post-function debug information.
799 NamedRegionTimer T(DbgTimerName, DWARFGroupName, TimePassesIsEnabled);
803 NamedRegionTimer T(EHTimerName, DWARFGroupName, TimePassesIsEnabled);
808 // Print out jump tables referenced by the function.
811 OutStreamer.AddBlankLine();
814 /// EmitDwarfRegOp - Emit dwarf register operation.
815 void AsmPrinter::EmitDwarfRegOp(const MachineLocation &MLoc,
816 bool Indirect) const {
817 const TargetRegisterInfo *TRI = TM.getRegisterInfo();
818 int Reg = TRI->getDwarfRegNum(MLoc.getReg(), false);
820 for (MCSuperRegIterator SR(MLoc.getReg(), TRI); SR.isValid() && Reg < 0;
822 Reg = TRI->getDwarfRegNum(*SR, false);
823 // FIXME: Get the bit range this register uses of the superregister
824 // so that we can produce a DW_OP_bit_piece
827 // FIXME: Handle cases like a super register being encoded as
828 // DW_OP_reg 32 DW_OP_piece 4 DW_OP_reg 33
830 // FIXME: We have no reasonable way of handling errors in here. The
831 // caller might be in the middle of an dwarf expression. We should
832 // probably assert that Reg >= 0 once debug info generation is more mature.
834 if (MLoc.isIndirect() || Indirect) {
836 OutStreamer.AddComment(
837 dwarf::OperationEncodingString(dwarf::DW_OP_breg0 + Reg));
838 EmitInt8(dwarf::DW_OP_breg0 + Reg);
840 OutStreamer.AddComment("DW_OP_bregx");
841 EmitInt8(dwarf::DW_OP_bregx);
842 OutStreamer.AddComment(Twine(Reg));
845 EmitSLEB128(!MLoc.isIndirect() ? 0 : MLoc.getOffset());
846 if (MLoc.isIndirect() && Indirect)
847 EmitInt8(dwarf::DW_OP_deref);
850 OutStreamer.AddComment(
851 dwarf::OperationEncodingString(dwarf::DW_OP_reg0 + Reg));
852 EmitInt8(dwarf::DW_OP_reg0 + Reg);
854 OutStreamer.AddComment("DW_OP_regx");
855 EmitInt8(dwarf::DW_OP_regx);
856 OutStreamer.AddComment(Twine(Reg));
861 // FIXME: Produce a DW_OP_bit_piece if we used a superregister
864 bool AsmPrinter::doFinalization(Module &M) {
865 // Emit global variables.
866 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
868 EmitGlobalVariable(I);
870 // Emit visibility info for declarations
871 for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I) {
872 const Function &F = *I;
873 if (!F.isDeclaration())
875 GlobalValue::VisibilityTypes V = F.getVisibility();
876 if (V == GlobalValue::DefaultVisibility)
879 MCSymbol *Name = Mang->getSymbol(&F);
880 EmitVisibility(Name, V, false);
883 // Emit module flags.
884 SmallVector<Module::ModuleFlagEntry, 8> ModuleFlags;
885 M.getModuleFlagsMetadata(ModuleFlags);
886 if (!ModuleFlags.empty())
887 getObjFileLowering().emitModuleFlags(OutStreamer, ModuleFlags, Mang, TM);
889 // Finalize debug and EH information.
892 NamedRegionTimer T(EHTimerName, DWARFGroupName, TimePassesIsEnabled);
899 NamedRegionTimer T(DbgTimerName, DWARFGroupName, TimePassesIsEnabled);
905 // If the target wants to know about weak references, print them all.
906 if (MAI->getWeakRefDirective()) {
907 // FIXME: This is not lazy, it would be nice to only print weak references
908 // to stuff that is actually used. Note that doing so would require targets
909 // to notice uses in operands (due to constant exprs etc). This should
910 // happen with the MC stuff eventually.
912 // Print out module-level global variables here.
913 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
915 if (!I->hasExternalWeakLinkage()) continue;
916 OutStreamer.EmitSymbolAttribute(Mang->getSymbol(I), MCSA_WeakReference);
919 for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I) {
920 if (!I->hasExternalWeakLinkage()) continue;
921 OutStreamer.EmitSymbolAttribute(Mang->getSymbol(I), MCSA_WeakReference);
925 if (MAI->hasSetDirective()) {
926 OutStreamer.AddBlankLine();
927 for (Module::const_alias_iterator I = M.alias_begin(), E = M.alias_end();
929 MCSymbol *Name = Mang->getSymbol(I);
931 const GlobalValue *GV = I->getAliasedGlobal();
932 MCSymbol *Target = Mang->getSymbol(GV);
934 if (I->hasExternalLinkage() || !MAI->getWeakRefDirective())
935 OutStreamer.EmitSymbolAttribute(Name, MCSA_Global);
936 else if (I->hasWeakLinkage())
937 OutStreamer.EmitSymbolAttribute(Name, MCSA_WeakReference);
939 assert(I->hasLocalLinkage() && "Invalid alias linkage");
941 EmitVisibility(Name, I->getVisibility());
943 // Emit the directives as assignments aka .set:
944 OutStreamer.EmitAssignment(Name,
945 MCSymbolRefExpr::Create(Target, OutContext));
949 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
950 assert(MI && "AsmPrinter didn't require GCModuleInfo?");
951 for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; )
952 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*--I))
953 MP->finishAssembly(*this);
955 // If we don't have any trampolines, then we don't require stack memory
956 // to be executable. Some targets have a directive to declare this.
957 Function *InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline");
958 if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty())
959 if (const MCSection *S = MAI->getNonexecutableStackSection(OutContext))
960 OutStreamer.SwitchSection(S);
962 // Allow the target to emit any magic that it wants at the end of the file,
963 // after everything else has gone out.
966 delete Mang; Mang = 0;
969 OutStreamer.Finish();
975 void AsmPrinter::SetupMachineFunction(MachineFunction &MF) {
977 // Get the function symbol.
978 CurrentFnSym = Mang->getSymbol(MF.getFunction());
979 CurrentFnSymForSize = CurrentFnSym;
982 LI = &getAnalysis<MachineLoopInfo>();
986 // SectionCPs - Keep track the alignment, constpool entries per Section.
990 SmallVector<unsigned, 4> CPEs;
991 SectionCPs(const MCSection *s, unsigned a) : S(s), Alignment(a) {}
995 /// EmitConstantPool - Print to the current output stream assembly
996 /// representations of the constants in the constant pool MCP. This is
997 /// used to print out constants which have been "spilled to memory" by
998 /// the code generator.
1000 void AsmPrinter::EmitConstantPool() {
1001 const MachineConstantPool *MCP = MF->getConstantPool();
1002 const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
1003 if (CP.empty()) return;
1005 // Calculate sections for constant pool entries. We collect entries to go into
1006 // the same section together to reduce amount of section switch statements.
1007 SmallVector<SectionCPs, 4> CPSections;
1008 for (unsigned i = 0, e = CP.size(); i != e; ++i) {
1009 const MachineConstantPoolEntry &CPE = CP[i];
1010 unsigned Align = CPE.getAlignment();
1013 switch (CPE.getRelocationInfo()) {
1014 default: llvm_unreachable("Unknown section kind");
1015 case 2: Kind = SectionKind::getReadOnlyWithRel(); break;
1017 Kind = SectionKind::getReadOnlyWithRelLocal();
1020 switch (TM.getDataLayout()->getTypeAllocSize(CPE.getType())) {
1021 case 4: Kind = SectionKind::getMergeableConst4(); break;
1022 case 8: Kind = SectionKind::getMergeableConst8(); break;
1023 case 16: Kind = SectionKind::getMergeableConst16();break;
1024 default: Kind = SectionKind::getMergeableConst(); break;
1028 const MCSection *S = getObjFileLowering().getSectionForConstant(Kind);
1030 // The number of sections are small, just do a linear search from the
1031 // last section to the first.
1033 unsigned SecIdx = CPSections.size();
1034 while (SecIdx != 0) {
1035 if (CPSections[--SecIdx].S == S) {
1041 SecIdx = CPSections.size();
1042 CPSections.push_back(SectionCPs(S, Align));
1045 if (Align > CPSections[SecIdx].Alignment)
1046 CPSections[SecIdx].Alignment = Align;
1047 CPSections[SecIdx].CPEs.push_back(i);
1050 // Now print stuff into the calculated sections.
1051 for (unsigned i = 0, e = CPSections.size(); i != e; ++i) {
1052 OutStreamer.SwitchSection(CPSections[i].S);
1053 EmitAlignment(Log2_32(CPSections[i].Alignment));
1055 unsigned Offset = 0;
1056 for (unsigned j = 0, ee = CPSections[i].CPEs.size(); j != ee; ++j) {
1057 unsigned CPI = CPSections[i].CPEs[j];
1058 MachineConstantPoolEntry CPE = CP[CPI];
1060 // Emit inter-object padding for alignment.
1061 unsigned AlignMask = CPE.getAlignment() - 1;
1062 unsigned NewOffset = (Offset + AlignMask) & ~AlignMask;
1063 OutStreamer.EmitZeros(NewOffset - Offset);
1065 Type *Ty = CPE.getType();
1066 Offset = NewOffset + TM.getDataLayout()->getTypeAllocSize(Ty);
1067 OutStreamer.EmitLabel(GetCPISymbol(CPI));
1069 if (CPE.isMachineConstantPoolEntry())
1070 EmitMachineConstantPoolValue(CPE.Val.MachineCPVal);
1072 EmitGlobalConstant(CPE.Val.ConstVal);
1077 /// EmitJumpTableInfo - Print assembly representations of the jump tables used
1078 /// by the current function to the current output stream.
1080 void AsmPrinter::EmitJumpTableInfo() {
1081 const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo();
1082 if (MJTI == 0) return;
1083 if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_Inline) return;
1084 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
1085 if (JT.empty()) return;
1087 // Pick the directive to use to print the jump table entries, and switch to
1088 // the appropriate section.
1089 const Function *F = MF->getFunction();
1090 bool JTInDiffSection = false;
1091 if (// In PIC mode, we need to emit the jump table to the same section as the
1092 // function body itself, otherwise the label differences won't make sense.
1093 // FIXME: Need a better predicate for this: what about custom entries?
1094 MJTI->getEntryKind() == MachineJumpTableInfo::EK_LabelDifference32 ||
1095 // We should also do if the section name is NULL or function is declared
1096 // in discardable section
1097 // FIXME: this isn't the right predicate, should be based on the MCSection
1098 // for the function.
1099 F->isWeakForLinker()) {
1100 OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F,Mang,TM));
1102 // Otherwise, drop it in the readonly section.
1103 const MCSection *ReadOnlySection =
1104 getObjFileLowering().getSectionForConstant(SectionKind::getReadOnly());
1105 OutStreamer.SwitchSection(ReadOnlySection);
1106 JTInDiffSection = true;
1109 EmitAlignment(Log2_32(MJTI->getEntryAlignment(*TM.getDataLayout())));
1111 // Jump tables in code sections are marked with a data_region directive
1112 // where that's supported.
1113 if (!JTInDiffSection)
1114 OutStreamer.EmitDataRegion(MCDR_DataRegionJT32);
1116 for (unsigned JTI = 0, e = JT.size(); JTI != e; ++JTI) {
1117 const std::vector<MachineBasicBlock*> &JTBBs = JT[JTI].MBBs;
1119 // If this jump table was deleted, ignore it.
1120 if (JTBBs.empty()) continue;
1122 // For the EK_LabelDifference32 entry, if the target supports .set, emit a
1123 // .set directive for each unique entry. This reduces the number of
1124 // relocations the assembler will generate for the jump table.
1125 if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_LabelDifference32 &&
1126 MAI->hasSetDirective()) {
1127 SmallPtrSet<const MachineBasicBlock*, 16> EmittedSets;
1128 const TargetLowering *TLI = TM.getTargetLowering();
1129 const MCExpr *Base = TLI->getPICJumpTableRelocBaseExpr(MF,JTI,OutContext);
1130 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
1131 const MachineBasicBlock *MBB = JTBBs[ii];
1132 if (!EmittedSets.insert(MBB)) continue;
1134 // .set LJTSet, LBB32-base
1136 MCSymbolRefExpr::Create(MBB->getSymbol(), OutContext);
1137 OutStreamer.EmitAssignment(GetJTSetSymbol(JTI, MBB->getNumber()),
1138 MCBinaryExpr::CreateSub(LHS, Base, OutContext));
1142 // On some targets (e.g. Darwin) we want to emit two consecutive labels
1143 // before each jump table. The first label is never referenced, but tells
1144 // the assembler and linker the extents of the jump table object. The
1145 // second label is actually referenced by the code.
1146 if (JTInDiffSection && MAI->getLinkerPrivateGlobalPrefix()[0])
1147 // FIXME: This doesn't have to have any specific name, just any randomly
1148 // named and numbered 'l' label would work. Simplify GetJTISymbol.
1149 OutStreamer.EmitLabel(GetJTISymbol(JTI, true));
1151 OutStreamer.EmitLabel(GetJTISymbol(JTI));
1153 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
1154 EmitJumpTableEntry(MJTI, JTBBs[ii], JTI);
1156 if (!JTInDiffSection)
1157 OutStreamer.EmitDataRegion(MCDR_DataRegionEnd);
1160 /// EmitJumpTableEntry - Emit a jump table entry for the specified MBB to the
1162 void AsmPrinter::EmitJumpTableEntry(const MachineJumpTableInfo *MJTI,
1163 const MachineBasicBlock *MBB,
1164 unsigned UID) const {
1165 assert(MBB && MBB->getNumber() >= 0 && "Invalid basic block");
1166 const MCExpr *Value = 0;
1167 switch (MJTI->getEntryKind()) {
1168 case MachineJumpTableInfo::EK_Inline:
1169 llvm_unreachable("Cannot emit EK_Inline jump table entry");
1170 case MachineJumpTableInfo::EK_Custom32:
1171 Value = TM.getTargetLowering()->LowerCustomJumpTableEntry(MJTI, MBB, UID,
1174 case MachineJumpTableInfo::EK_BlockAddress:
1175 // EK_BlockAddress - Each entry is a plain address of block, e.g.:
1177 Value = MCSymbolRefExpr::Create(MBB->getSymbol(), OutContext);
1179 case MachineJumpTableInfo::EK_GPRel32BlockAddress: {
1180 // EK_GPRel32BlockAddress - Each entry is an address of block, encoded
1181 // with a relocation as gp-relative, e.g.:
1183 MCSymbol *MBBSym = MBB->getSymbol();
1184 OutStreamer.EmitGPRel32Value(MCSymbolRefExpr::Create(MBBSym, OutContext));
1188 case MachineJumpTableInfo::EK_GPRel64BlockAddress: {
1189 // EK_GPRel64BlockAddress - Each entry is an address of block, encoded
1190 // with a relocation as gp-relative, e.g.:
1192 MCSymbol *MBBSym = MBB->getSymbol();
1193 OutStreamer.EmitGPRel64Value(MCSymbolRefExpr::Create(MBBSym, OutContext));
1197 case MachineJumpTableInfo::EK_LabelDifference32: {
1198 // EK_LabelDifference32 - Each entry is the address of the block minus
1199 // the address of the jump table. This is used for PIC jump tables where
1200 // gprel32 is not supported. e.g.:
1201 // .word LBB123 - LJTI1_2
1202 // If the .set directive is supported, this is emitted as:
1203 // .set L4_5_set_123, LBB123 - LJTI1_2
1204 // .word L4_5_set_123
1206 // If we have emitted set directives for the jump table entries, print
1207 // them rather than the entries themselves. If we're emitting PIC, then
1208 // emit the table entries as differences between two text section labels.
1209 if (MAI->hasSetDirective()) {
1210 // If we used .set, reference the .set's symbol.
1211 Value = MCSymbolRefExpr::Create(GetJTSetSymbol(UID, MBB->getNumber()),
1215 // Otherwise, use the difference as the jump table entry.
1216 Value = MCSymbolRefExpr::Create(MBB->getSymbol(), OutContext);
1217 const MCExpr *JTI = MCSymbolRefExpr::Create(GetJTISymbol(UID), OutContext);
1218 Value = MCBinaryExpr::CreateSub(Value, JTI, OutContext);
1223 assert(Value && "Unknown entry kind!");
1225 unsigned EntrySize = MJTI->getEntrySize(*TM.getDataLayout());
1226 OutStreamer.EmitValue(Value, EntrySize);
1230 /// EmitSpecialLLVMGlobal - Check to see if the specified global is a
1231 /// special global used by LLVM. If so, emit it and return true, otherwise
1232 /// do nothing and return false.
1233 bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
1234 if (GV->getName() == "llvm.used") {
1235 if (MAI->hasNoDeadStrip()) // No need to emit this at all.
1236 EmitLLVMUsedList(cast<ConstantArray>(GV->getInitializer()));
1240 // Ignore debug and non-emitted data. This handles llvm.compiler.used.
1241 if (GV->getSection() == "llvm.metadata" ||
1242 GV->hasAvailableExternallyLinkage())
1245 if (!GV->hasAppendingLinkage()) return false;
1247 assert(GV->hasInitializer() && "Not a special LLVM global!");
1249 if (GV->getName() == "llvm.global_ctors") {
1250 EmitXXStructorList(GV->getInitializer(), /* isCtor */ true);
1252 if (TM.getRelocationModel() == Reloc::Static &&
1253 MAI->hasStaticCtorDtorReferenceInStaticMode()) {
1254 StringRef Sym(".constructors_used");
1255 OutStreamer.EmitSymbolAttribute(OutContext.GetOrCreateSymbol(Sym),
1261 if (GV->getName() == "llvm.global_dtors") {
1262 EmitXXStructorList(GV->getInitializer(), /* isCtor */ false);
1264 if (TM.getRelocationModel() == Reloc::Static &&
1265 MAI->hasStaticCtorDtorReferenceInStaticMode()) {
1266 StringRef Sym(".destructors_used");
1267 OutStreamer.EmitSymbolAttribute(OutContext.GetOrCreateSymbol(Sym),
1276 /// EmitLLVMUsedList - For targets that define a MAI::UsedDirective, mark each
1277 /// global in the specified llvm.used list for which emitUsedDirectiveFor
1278 /// is true, as being used with this directive.
1279 void AsmPrinter::EmitLLVMUsedList(const ConstantArray *InitList) {
1280 // Should be an array of 'i8*'.
1281 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
1282 const GlobalValue *GV =
1283 dyn_cast<GlobalValue>(InitList->getOperand(i)->stripPointerCasts());
1284 if (GV && getObjFileLowering().shouldEmitUsedDirectiveFor(GV, Mang))
1285 OutStreamer.EmitSymbolAttribute(Mang->getSymbol(GV), MCSA_NoDeadStrip);
1289 typedef std::pair<unsigned, Constant*> Structor;
1291 static bool priority_order(const Structor& lhs, const Structor& rhs) {
1292 return lhs.first < rhs.first;
1295 /// EmitXXStructorList - Emit the ctor or dtor list taking into account the init
1297 void AsmPrinter::EmitXXStructorList(const Constant *List, bool isCtor) {
1298 // Should be an array of '{ int, void ()* }' structs. The first value is the
1300 if (!isa<ConstantArray>(List)) return;
1302 // Sanity check the structors list.
1303 const ConstantArray *InitList = dyn_cast<ConstantArray>(List);
1304 if (!InitList) return; // Not an array!
1305 StructType *ETy = dyn_cast<StructType>(InitList->getType()->getElementType());
1306 if (!ETy || ETy->getNumElements() != 2) return; // Not an array of pairs!
1307 if (!isa<IntegerType>(ETy->getTypeAtIndex(0U)) ||
1308 !isa<PointerType>(ETy->getTypeAtIndex(1U))) return; // Not (int, ptr).
1310 // Gather the structors in a form that's convenient for sorting by priority.
1311 SmallVector<Structor, 8> Structors;
1312 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
1313 ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i));
1314 if (!CS) continue; // Malformed.
1315 if (CS->getOperand(1)->isNullValue())
1316 break; // Found a null terminator, skip the rest.
1317 ConstantInt *Priority = dyn_cast<ConstantInt>(CS->getOperand(0));
1318 if (!Priority) continue; // Malformed.
1319 Structors.push_back(std::make_pair(Priority->getLimitedValue(65535),
1320 CS->getOperand(1)));
1323 // Emit the function pointers in the target-specific order
1324 const DataLayout *TD = TM.getDataLayout();
1325 unsigned Align = Log2_32(TD->getPointerPrefAlignment());
1326 std::stable_sort(Structors.begin(), Structors.end(), priority_order);
1327 for (unsigned i = 0, e = Structors.size(); i != e; ++i) {
1328 const MCSection *OutputSection =
1330 getObjFileLowering().getStaticCtorSection(Structors[i].first) :
1331 getObjFileLowering().getStaticDtorSection(Structors[i].first));
1332 OutStreamer.SwitchSection(OutputSection);
1333 if (OutStreamer.getCurrentSection() != OutStreamer.getPreviousSection())
1334 EmitAlignment(Align);
1335 EmitXXStructor(Structors[i].second);
1339 //===--------------------------------------------------------------------===//
1340 // Emission and print routines
1343 /// EmitInt8 - Emit a byte directive and value.
1345 void AsmPrinter::EmitInt8(int Value) const {
1346 OutStreamer.EmitIntValue(Value, 1);
1349 /// EmitInt16 - Emit a short directive and value.
1351 void AsmPrinter::EmitInt16(int Value) const {
1352 OutStreamer.EmitIntValue(Value, 2);
1355 /// EmitInt32 - Emit a long directive and value.
1357 void AsmPrinter::EmitInt32(int Value) const {
1358 OutStreamer.EmitIntValue(Value, 4);
1361 /// EmitLabelDifference - Emit something like ".long Hi-Lo" where the size
1362 /// in bytes of the directive is specified by Size and Hi/Lo specify the
1363 /// labels. This implicitly uses .set if it is available.
1364 void AsmPrinter::EmitLabelDifference(const MCSymbol *Hi, const MCSymbol *Lo,
1365 unsigned Size) const {
1366 // Get the Hi-Lo expression.
1367 const MCExpr *Diff =
1368 MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(Hi, OutContext),
1369 MCSymbolRefExpr::Create(Lo, OutContext),
1372 if (!MAI->hasSetDirective()) {
1373 OutStreamer.EmitValue(Diff, Size);
1377 // Otherwise, emit with .set (aka assignment).
1378 MCSymbol *SetLabel = GetTempSymbol("set", SetCounter++);
1379 OutStreamer.EmitAssignment(SetLabel, Diff);
1380 OutStreamer.EmitSymbolValue(SetLabel, Size);
1383 /// EmitLabelOffsetDifference - Emit something like ".long Hi+Offset-Lo"
1384 /// where the size in bytes of the directive is specified by Size and Hi/Lo
1385 /// specify the labels. This implicitly uses .set if it is available.
1386 void AsmPrinter::EmitLabelOffsetDifference(const MCSymbol *Hi, uint64_t Offset,
1387 const MCSymbol *Lo, unsigned Size)
1390 // Emit Hi+Offset - Lo
1391 // Get the Hi+Offset expression.
1392 const MCExpr *Plus =
1393 MCBinaryExpr::CreateAdd(MCSymbolRefExpr::Create(Hi, OutContext),
1394 MCConstantExpr::Create(Offset, OutContext),
1397 // Get the Hi+Offset-Lo expression.
1398 const MCExpr *Diff =
1399 MCBinaryExpr::CreateSub(Plus,
1400 MCSymbolRefExpr::Create(Lo, OutContext),
1403 if (!MAI->hasSetDirective())
1404 OutStreamer.EmitValue(Diff, 4);
1406 // Otherwise, emit with .set (aka assignment).
1407 MCSymbol *SetLabel = GetTempSymbol("set", SetCounter++);
1408 OutStreamer.EmitAssignment(SetLabel, Diff);
1409 OutStreamer.EmitSymbolValue(SetLabel, 4);
1413 /// EmitLabelPlusOffset - Emit something like ".long Label+Offset"
1414 /// where the size in bytes of the directive is specified by Size and Label
1415 /// specifies the label. This implicitly uses .set if it is available.
1416 void AsmPrinter::EmitLabelPlusOffset(const MCSymbol *Label, uint64_t Offset,
1419 if (MAI->needsDwarfSectionOffsetDirective() && Size == 4) { // secrel32 ONLY works for 32bits.
1420 OutStreamer.EmitCOFFSecRel32(Label);
1424 // Emit Label+Offset (or just Label if Offset is zero)
1425 const MCExpr *Expr = MCSymbolRefExpr::Create(Label, OutContext);
1427 Expr = MCBinaryExpr::CreateAdd(Expr,
1428 MCConstantExpr::Create(Offset, OutContext),
1431 OutStreamer.EmitValue(Expr, Size);
1435 //===----------------------------------------------------------------------===//
1437 // EmitAlignment - Emit an alignment directive to the specified power of
1438 // two boundary. For example, if you pass in 3 here, you will get an 8
1439 // byte alignment. If a global value is specified, and if that global has
1440 // an explicit alignment requested, it will override the alignment request
1441 // if required for correctness.
1443 void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV) const {
1444 if (GV) NumBits = getGVAlignmentLog2(GV, *TM.getDataLayout(), NumBits);
1446 if (NumBits == 0) return; // 1-byte aligned: no need to emit alignment.
1448 if (getCurrentSection()->getKind().isText())
1449 OutStreamer.EmitCodeAlignment(1 << NumBits);
1451 OutStreamer.EmitValueToAlignment(1 << NumBits, 0, 1, 0);
1454 //===----------------------------------------------------------------------===//
1455 // Constant emission.
1456 //===----------------------------------------------------------------------===//
1458 /// lowerConstant - Lower the specified LLVM Constant to an MCExpr.
1460 static const MCExpr *lowerConstant(const Constant *CV, AsmPrinter &AP) {
1461 MCContext &Ctx = AP.OutContext;
1463 if (CV->isNullValue() || isa<UndefValue>(CV))
1464 return MCConstantExpr::Create(0, Ctx);
1466 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV))
1467 return MCConstantExpr::Create(CI->getZExtValue(), Ctx);
1469 if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV))
1470 return MCSymbolRefExpr::Create(AP.Mang->getSymbol(GV), Ctx);
1472 if (const BlockAddress *BA = dyn_cast<BlockAddress>(CV))
1473 return MCSymbolRefExpr::Create(AP.GetBlockAddressSymbol(BA), Ctx);
1475 const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV);
1477 llvm_unreachable("Unknown constant value to lower!");
1480 switch (CE->getOpcode()) {
1482 // If the code isn't optimized, there may be outstanding folding
1483 // opportunities. Attempt to fold the expression using DataLayout as a
1484 // last resort before giving up.
1486 ConstantFoldConstantExpression(CE, AP.TM.getDataLayout()))
1488 return lowerConstant(C, AP);
1490 // Otherwise report the problem to the user.
1493 raw_string_ostream OS(S);
1494 OS << "Unsupported expression in static initializer: ";
1495 WriteAsOperand(OS, CE, /*PrintType=*/false,
1496 !AP.MF ? 0 : AP.MF->getFunction()->getParent());
1497 report_fatal_error(OS.str());
1499 case Instruction::GetElementPtr: {
1500 const DataLayout &TD = *AP.TM.getDataLayout();
1501 // Generate a symbolic expression for the byte address
1502 APInt OffsetAI(TD.getPointerSizeInBits(), 0);
1503 cast<GEPOperator>(CE)->accumulateConstantOffset(TD, OffsetAI);
1505 const MCExpr *Base = lowerConstant(CE->getOperand(0), AP);
1509 int64_t Offset = OffsetAI.getSExtValue();
1510 return MCBinaryExpr::CreateAdd(Base, MCConstantExpr::Create(Offset, Ctx),
1514 case Instruction::Trunc:
1515 // We emit the value and depend on the assembler to truncate the generated
1516 // expression properly. This is important for differences between
1517 // blockaddress labels. Since the two labels are in the same function, it
1518 // is reasonable to treat their delta as a 32-bit value.
1520 case Instruction::BitCast:
1521 return lowerConstant(CE->getOperand(0), AP);
1523 case Instruction::IntToPtr: {
1524 const DataLayout &TD = *AP.TM.getDataLayout();
1525 // Handle casts to pointers by changing them into casts to the appropriate
1526 // integer type. This promotes constant folding and simplifies this code.
1527 Constant *Op = CE->getOperand(0);
1528 Op = ConstantExpr::getIntegerCast(Op, TD.getIntPtrType(CV->getContext()),
1530 return lowerConstant(Op, AP);
1533 case Instruction::PtrToInt: {
1534 const DataLayout &TD = *AP.TM.getDataLayout();
1535 // Support only foldable casts to/from pointers that can be eliminated by
1536 // changing the pointer to the appropriately sized integer type.
1537 Constant *Op = CE->getOperand(0);
1538 Type *Ty = CE->getType();
1540 const MCExpr *OpExpr = lowerConstant(Op, AP);
1542 // We can emit the pointer value into this slot if the slot is an
1543 // integer slot equal to the size of the pointer.
1544 if (TD.getTypeAllocSize(Ty) == TD.getTypeAllocSize(Op->getType()))
1547 // Otherwise the pointer is smaller than the resultant integer, mask off
1548 // the high bits so we are sure to get a proper truncation if the input is
1550 unsigned InBits = TD.getTypeAllocSizeInBits(Op->getType());
1551 const MCExpr *MaskExpr = MCConstantExpr::Create(~0ULL >> (64-InBits), Ctx);
1552 return MCBinaryExpr::CreateAnd(OpExpr, MaskExpr, Ctx);
1555 // The MC library also has a right-shift operator, but it isn't consistently
1556 // signed or unsigned between different targets.
1557 case Instruction::Add:
1558 case Instruction::Sub:
1559 case Instruction::Mul:
1560 case Instruction::SDiv:
1561 case Instruction::SRem:
1562 case Instruction::Shl:
1563 case Instruction::And:
1564 case Instruction::Or:
1565 case Instruction::Xor: {
1566 const MCExpr *LHS = lowerConstant(CE->getOperand(0), AP);
1567 const MCExpr *RHS = lowerConstant(CE->getOperand(1), AP);
1568 switch (CE->getOpcode()) {
1569 default: llvm_unreachable("Unknown binary operator constant cast expr");
1570 case Instruction::Add: return MCBinaryExpr::CreateAdd(LHS, RHS, Ctx);
1571 case Instruction::Sub: return MCBinaryExpr::CreateSub(LHS, RHS, Ctx);
1572 case Instruction::Mul: return MCBinaryExpr::CreateMul(LHS, RHS, Ctx);
1573 case Instruction::SDiv: return MCBinaryExpr::CreateDiv(LHS, RHS, Ctx);
1574 case Instruction::SRem: return MCBinaryExpr::CreateMod(LHS, RHS, Ctx);
1575 case Instruction::Shl: return MCBinaryExpr::CreateShl(LHS, RHS, Ctx);
1576 case Instruction::And: return MCBinaryExpr::CreateAnd(LHS, RHS, Ctx);
1577 case Instruction::Or: return MCBinaryExpr::CreateOr (LHS, RHS, Ctx);
1578 case Instruction::Xor: return MCBinaryExpr::CreateXor(LHS, RHS, Ctx);
1584 static void emitGlobalConstantImpl(const Constant *C, AsmPrinter &AP);
1586 /// isRepeatedByteSequence - Determine whether the given value is
1587 /// composed of a repeated sequence of identical bytes and return the
1588 /// byte value. If it is not a repeated sequence, return -1.
1589 static int isRepeatedByteSequence(const ConstantDataSequential *V) {
1590 StringRef Data = V->getRawDataValues();
1591 assert(!Data.empty() && "Empty aggregates should be CAZ node");
1593 for (unsigned i = 1, e = Data.size(); i != e; ++i)
1594 if (Data[i] != C) return -1;
1595 return static_cast<uint8_t>(C); // Ensure 255 is not returned as -1.
1599 /// isRepeatedByteSequence - Determine whether the given value is
1600 /// composed of a repeated sequence of identical bytes and return the
1601 /// byte value. If it is not a repeated sequence, return -1.
1602 static int isRepeatedByteSequence(const Value *V, TargetMachine &TM) {
1604 if (const ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
1605 if (CI->getBitWidth() > 64) return -1;
1607 uint64_t Size = TM.getDataLayout()->getTypeAllocSize(V->getType());
1608 uint64_t Value = CI->getZExtValue();
1610 // Make sure the constant is at least 8 bits long and has a power
1611 // of 2 bit width. This guarantees the constant bit width is
1612 // always a multiple of 8 bits, avoiding issues with padding out
1613 // to Size and other such corner cases.
1614 if (CI->getBitWidth() < 8 || !isPowerOf2_64(CI->getBitWidth())) return -1;
1616 uint8_t Byte = static_cast<uint8_t>(Value);
1618 for (unsigned i = 1; i < Size; ++i) {
1620 if (static_cast<uint8_t>(Value) != Byte) return -1;
1624 if (const ConstantArray *CA = dyn_cast<ConstantArray>(V)) {
1625 // Make sure all array elements are sequences of the same repeated
1627 assert(CA->getNumOperands() != 0 && "Should be a CAZ");
1628 int Byte = isRepeatedByteSequence(CA->getOperand(0), TM);
1629 if (Byte == -1) return -1;
1631 for (unsigned i = 1, e = CA->getNumOperands(); i != e; ++i) {
1632 int ThisByte = isRepeatedByteSequence(CA->getOperand(i), TM);
1633 if (ThisByte == -1) return -1;
1634 if (Byte != ThisByte) return -1;
1639 if (const ConstantDataSequential *CDS = dyn_cast<ConstantDataSequential>(V))
1640 return isRepeatedByteSequence(CDS);
1645 static void emitGlobalConstantDataSequential(const ConstantDataSequential *CDS,
1648 // See if we can aggregate this into a .fill, if so, emit it as such.
1649 int Value = isRepeatedByteSequence(CDS, AP.TM);
1651 uint64_t Bytes = AP.TM.getDataLayout()->getTypeAllocSize(CDS->getType());
1652 // Don't emit a 1-byte object as a .fill.
1654 return AP.OutStreamer.EmitFill(Bytes, Value);
1657 // If this can be emitted with .ascii/.asciz, emit it as such.
1658 if (CDS->isString())
1659 return AP.OutStreamer.EmitBytes(CDS->getAsString());
1661 // Otherwise, emit the values in successive locations.
1662 unsigned ElementByteSize = CDS->getElementByteSize();
1663 if (isa<IntegerType>(CDS->getElementType())) {
1664 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) {
1666 AP.OutStreamer.GetCommentOS() << format("0x%" PRIx64 "\n",
1667 CDS->getElementAsInteger(i));
1668 AP.OutStreamer.EmitIntValue(CDS->getElementAsInteger(i),
1671 } else if (ElementByteSize == 4) {
1672 // FP Constants are printed as integer constants to avoid losing
1674 assert(CDS->getElementType()->isFloatTy());
1675 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) {
1681 F = CDS->getElementAsFloat(i);
1683 AP.OutStreamer.GetCommentOS() << "float " << F << '\n';
1684 AP.OutStreamer.EmitIntValue(I, 4);
1687 assert(CDS->getElementType()->isDoubleTy());
1688 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) {
1694 F = CDS->getElementAsDouble(i);
1696 AP.OutStreamer.GetCommentOS() << "double " << F << '\n';
1697 AP.OutStreamer.EmitIntValue(I, 8);
1701 const DataLayout &TD = *AP.TM.getDataLayout();
1702 unsigned Size = TD.getTypeAllocSize(CDS->getType());
1703 unsigned EmittedSize = TD.getTypeAllocSize(CDS->getType()->getElementType()) *
1704 CDS->getNumElements();
1705 if (unsigned Padding = Size - EmittedSize)
1706 AP.OutStreamer.EmitZeros(Padding);
1710 static void emitGlobalConstantArray(const ConstantArray *CA, AsmPrinter &AP) {
1711 // See if we can aggregate some values. Make sure it can be
1712 // represented as a series of bytes of the constant value.
1713 int Value = isRepeatedByteSequence(CA, AP.TM);
1716 uint64_t Bytes = AP.TM.getDataLayout()->getTypeAllocSize(CA->getType());
1717 AP.OutStreamer.EmitFill(Bytes, Value);
1720 for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i)
1721 emitGlobalConstantImpl(CA->getOperand(i), AP);
1725 static void emitGlobalConstantVector(const ConstantVector *CV, AsmPrinter &AP) {
1726 for (unsigned i = 0, e = CV->getType()->getNumElements(); i != e; ++i)
1727 emitGlobalConstantImpl(CV->getOperand(i), AP);
1729 const DataLayout &TD = *AP.TM.getDataLayout();
1730 unsigned Size = TD.getTypeAllocSize(CV->getType());
1731 unsigned EmittedSize = TD.getTypeAllocSize(CV->getType()->getElementType()) *
1732 CV->getType()->getNumElements();
1733 if (unsigned Padding = Size - EmittedSize)
1734 AP.OutStreamer.EmitZeros(Padding);
1737 static void emitGlobalConstantStruct(const ConstantStruct *CS, AsmPrinter &AP) {
1738 // Print the fields in successive locations. Pad to align if needed!
1739 const DataLayout *TD = AP.TM.getDataLayout();
1740 unsigned Size = TD->getTypeAllocSize(CS->getType());
1741 const StructLayout *Layout = TD->getStructLayout(CS->getType());
1742 uint64_t SizeSoFar = 0;
1743 for (unsigned i = 0, e = CS->getNumOperands(); i != e; ++i) {
1744 const Constant *Field = CS->getOperand(i);
1746 // Check if padding is needed and insert one or more 0s.
1747 uint64_t FieldSize = TD->getTypeAllocSize(Field->getType());
1748 uint64_t PadSize = ((i == e-1 ? Size : Layout->getElementOffset(i+1))
1749 - Layout->getElementOffset(i)) - FieldSize;
1750 SizeSoFar += FieldSize + PadSize;
1752 // Now print the actual field value.
1753 emitGlobalConstantImpl(Field, AP);
1755 // Insert padding - this may include padding to increase the size of the
1756 // current field up to the ABI size (if the struct is not packed) as well
1757 // as padding to ensure that the next field starts at the right offset.
1758 AP.OutStreamer.EmitZeros(PadSize);
1760 assert(SizeSoFar == Layout->getSizeInBytes() &&
1761 "Layout of constant struct may be incorrect!");
1764 static void emitGlobalConstantFP(const ConstantFP *CFP, AsmPrinter &AP) {
1765 APInt API = CFP->getValueAPF().bitcastToAPInt();
1767 // First print a comment with what we think the original floating-point value
1768 // should have been.
1769 if (AP.isVerbose()) {
1770 SmallString<8> StrVal;
1771 CFP->getValueAPF().toString(StrVal);
1773 CFP->getType()->print(AP.OutStreamer.GetCommentOS());
1774 AP.OutStreamer.GetCommentOS() << ' ' << StrVal << '\n';
1777 // Now iterate through the APInt chunks, emitting them in endian-correct
1778 // order, possibly with a smaller chunk at beginning/end (e.g. for x87 80-bit
1780 unsigned NumBytes = API.getBitWidth() / 8;
1781 unsigned TrailingBytes = NumBytes % sizeof(uint64_t);
1782 const uint64_t *p = API.getRawData();
1784 // PPC's long double has odd notions of endianness compared to how LLVM
1785 // handles it: p[0] goes first for *big* endian on PPC.
1786 if (AP.TM.getDataLayout()->isBigEndian() != CFP->getType()->isPPC_FP128Ty()) {
1787 int Chunk = API.getNumWords() - 1;
1790 AP.OutStreamer.EmitIntValue(p[Chunk--], TrailingBytes);
1792 for (; Chunk >= 0; --Chunk)
1793 AP.OutStreamer.EmitIntValue(p[Chunk], sizeof(uint64_t));
1796 for (Chunk = 0; Chunk < NumBytes / sizeof(uint64_t); ++Chunk)
1797 AP.OutStreamer.EmitIntValue(p[Chunk], sizeof(uint64_t));
1800 AP.OutStreamer.EmitIntValue(p[Chunk], TrailingBytes);
1803 // Emit the tail padding for the long double.
1804 const DataLayout &TD = *AP.TM.getDataLayout();
1805 AP.OutStreamer.EmitZeros(TD.getTypeAllocSize(CFP->getType()) -
1806 TD.getTypeStoreSize(CFP->getType()));
1809 static void emitGlobalConstantLargeInt(const ConstantInt *CI, AsmPrinter &AP) {
1810 const DataLayout *TD = AP.TM.getDataLayout();
1811 unsigned BitWidth = CI->getBitWidth();
1813 // Copy the value as we may massage the layout for constants whose bit width
1814 // is not a multiple of 64-bits.
1815 APInt Realigned(CI->getValue());
1816 uint64_t ExtraBits = 0;
1817 unsigned ExtraBitsSize = BitWidth & 63;
1819 if (ExtraBitsSize) {
1820 // The bit width of the data is not a multiple of 64-bits.
1821 // The extra bits are expected to be at the end of the chunk of the memory.
1823 // * Nothing to be done, just record the extra bits to emit.
1825 // * Record the extra bits to emit.
1826 // * Realign the raw data to emit the chunks of 64-bits.
1827 if (TD->isBigEndian()) {
1828 // Basically the structure of the raw data is a chunk of 64-bits cells:
1829 // 0 1 BitWidth / 64
1830 // [chunk1][chunk2] ... [chunkN].
1831 // The most significant chunk is chunkN and it should be emitted first.
1832 // However, due to the alignment issue chunkN contains useless bits.
1833 // Realign the chunks so that they contain only useless information:
1834 // ExtraBits 0 1 (BitWidth / 64) - 1
1835 // chu[nk1 chu][nk2 chu] ... [nkN-1 chunkN]
1836 ExtraBits = Realigned.getRawData()[0] &
1837 (((uint64_t)-1) >> (64 - ExtraBitsSize));
1838 Realigned = Realigned.lshr(ExtraBitsSize);
1840 ExtraBits = Realigned.getRawData()[BitWidth / 64];
1843 // We don't expect assemblers to support integer data directives
1844 // for more than 64 bits, so we emit the data in at most 64-bit
1845 // quantities at a time.
1846 const uint64_t *RawData = Realigned.getRawData();
1847 for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) {
1848 uint64_t Val = TD->isBigEndian() ? RawData[e - i - 1] : RawData[i];
1849 AP.OutStreamer.EmitIntValue(Val, 8);
1852 if (ExtraBitsSize) {
1853 // Emit the extra bits after the 64-bits chunks.
1855 // Emit a directive that fills the expected size.
1856 uint64_t Size = AP.TM.getDataLayout()->getTypeAllocSize(CI->getType());
1857 Size -= (BitWidth / 64) * 8;
1858 assert(Size && Size * 8 >= ExtraBitsSize &&
1859 (ExtraBits & (((uint64_t)-1) >> (64 - ExtraBitsSize)))
1860 == ExtraBits && "Directive too small for extra bits.");
1861 AP.OutStreamer.EmitIntValue(ExtraBits, Size);
1865 static void emitGlobalConstantImpl(const Constant *CV, AsmPrinter &AP) {
1866 const DataLayout *TD = AP.TM.getDataLayout();
1867 uint64_t Size = TD->getTypeAllocSize(CV->getType());
1868 if (isa<ConstantAggregateZero>(CV) || isa<UndefValue>(CV))
1869 return AP.OutStreamer.EmitZeros(Size);
1871 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
1878 AP.OutStreamer.GetCommentOS() << format("0x%" PRIx64 "\n",
1879 CI->getZExtValue());
1880 AP.OutStreamer.EmitIntValue(CI->getZExtValue(), Size);
1883 emitGlobalConstantLargeInt(CI, AP);
1888 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV))
1889 return emitGlobalConstantFP(CFP, AP);
1891 if (isa<ConstantPointerNull>(CV)) {
1892 AP.OutStreamer.EmitIntValue(0, Size);
1896 if (const ConstantDataSequential *CDS = dyn_cast<ConstantDataSequential>(CV))
1897 return emitGlobalConstantDataSequential(CDS, AP);
1899 if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV))
1900 return emitGlobalConstantArray(CVA, AP);
1902 if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV))
1903 return emitGlobalConstantStruct(CVS, AP);
1905 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) {
1906 // Look through bitcasts, which might not be able to be MCExpr'ized (e.g. of
1908 if (CE->getOpcode() == Instruction::BitCast)
1909 return emitGlobalConstantImpl(CE->getOperand(0), AP);
1912 // If the constant expression's size is greater than 64-bits, then we have
1913 // to emit the value in chunks. Try to constant fold the value and emit it
1915 Constant *New = ConstantFoldConstantExpression(CE, TD);
1916 if (New && New != CE)
1917 return emitGlobalConstantImpl(New, AP);
1921 if (const ConstantVector *V = dyn_cast<ConstantVector>(CV))
1922 return emitGlobalConstantVector(V, AP);
1924 // Otherwise, it must be a ConstantExpr. Lower it to an MCExpr, then emit it
1925 // thread the streamer with EmitValue.
1926 AP.OutStreamer.EmitValue(lowerConstant(CV, AP), Size);
1929 /// EmitGlobalConstant - Print a general LLVM constant to the .s file.
1930 void AsmPrinter::EmitGlobalConstant(const Constant *CV) {
1931 uint64_t Size = TM.getDataLayout()->getTypeAllocSize(CV->getType());
1933 emitGlobalConstantImpl(CV, *this);
1934 else if (MAI->hasSubsectionsViaSymbols()) {
1935 // If the global has zero size, emit a single byte so that two labels don't
1936 // look like they are at the same location.
1937 OutStreamer.EmitIntValue(0, 1);
1941 void AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
1942 // Target doesn't support this yet!
1943 llvm_unreachable("Target does not support EmitMachineConstantPoolValue");
1946 void AsmPrinter::printOffset(int64_t Offset, raw_ostream &OS) const {
1948 OS << '+' << Offset;
1949 else if (Offset < 0)
1953 //===----------------------------------------------------------------------===//
1954 // Symbol Lowering Routines.
1955 //===----------------------------------------------------------------------===//
1957 /// GetTempSymbol - Return the MCSymbol corresponding to the assembler
1958 /// temporary label with the specified stem and unique ID.
1959 MCSymbol *AsmPrinter::GetTempSymbol(StringRef Name, unsigned ID) const {
1960 return OutContext.GetOrCreateSymbol(Twine(MAI->getPrivateGlobalPrefix()) +
1964 /// GetTempSymbol - Return an assembler temporary label with the specified
1966 MCSymbol *AsmPrinter::GetTempSymbol(StringRef Name) const {
1967 return OutContext.GetOrCreateSymbol(Twine(MAI->getPrivateGlobalPrefix())+
1972 MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BlockAddress *BA) const {
1973 return MMI->getAddrLabelSymbol(BA->getBasicBlock());
1976 MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BasicBlock *BB) const {
1977 return MMI->getAddrLabelSymbol(BB);
1980 /// GetCPISymbol - Return the symbol for the specified constant pool entry.
1981 MCSymbol *AsmPrinter::GetCPISymbol(unsigned CPID) const {
1982 return OutContext.GetOrCreateSymbol
1983 (Twine(MAI->getPrivateGlobalPrefix()) + "CPI" + Twine(getFunctionNumber())
1984 + "_" + Twine(CPID));
1987 /// GetJTISymbol - Return the symbol for the specified jump table entry.
1988 MCSymbol *AsmPrinter::GetJTISymbol(unsigned JTID, bool isLinkerPrivate) const {
1989 return MF->getJTISymbol(JTID, OutContext, isLinkerPrivate);
1992 /// GetJTSetSymbol - Return the symbol for the specified jump table .set
1993 /// FIXME: privatize to AsmPrinter.
1994 MCSymbol *AsmPrinter::GetJTSetSymbol(unsigned UID, unsigned MBBID) const {
1995 return OutContext.GetOrCreateSymbol
1996 (Twine(MAI->getPrivateGlobalPrefix()) + Twine(getFunctionNumber()) + "_" +
1997 Twine(UID) + "_set_" + Twine(MBBID));
2000 /// GetSymbolWithGlobalValueBase - Return the MCSymbol for a symbol with
2001 /// global value name as its base, with the specified suffix, and where the
2002 /// symbol is forced to have private linkage if ForcePrivate is true.
2003 MCSymbol *AsmPrinter::GetSymbolWithGlobalValueBase(const GlobalValue *GV,
2005 bool ForcePrivate) const {
2006 SmallString<60> NameStr;
2007 Mang->getNameWithPrefix(NameStr, GV, ForcePrivate);
2008 NameStr.append(Suffix.begin(), Suffix.end());
2009 return OutContext.GetOrCreateSymbol(NameStr.str());
2012 /// GetExternalSymbolSymbol - Return the MCSymbol for the specified
2014 MCSymbol *AsmPrinter::GetExternalSymbolSymbol(StringRef Sym) const {
2015 SmallString<60> NameStr;
2016 Mang->getNameWithPrefix(NameStr, Sym);
2017 return OutContext.GetOrCreateSymbol(NameStr.str());
2022 /// PrintParentLoopComment - Print comments about parent loops of this one.
2023 static void PrintParentLoopComment(raw_ostream &OS, const MachineLoop *Loop,
2024 unsigned FunctionNumber) {
2025 if (Loop == 0) return;
2026 PrintParentLoopComment(OS, Loop->getParentLoop(), FunctionNumber);
2027 OS.indent(Loop->getLoopDepth()*2)
2028 << "Parent Loop BB" << FunctionNumber << "_"
2029 << Loop->getHeader()->getNumber()
2030 << " Depth=" << Loop->getLoopDepth() << '\n';
2034 /// PrintChildLoopComment - Print comments about child loops within
2035 /// the loop for this basic block, with nesting.
2036 static void PrintChildLoopComment(raw_ostream &OS, const MachineLoop *Loop,
2037 unsigned FunctionNumber) {
2038 // Add child loop information
2039 for (MachineLoop::iterator CL = Loop->begin(), E = Loop->end();CL != E; ++CL){
2040 OS.indent((*CL)->getLoopDepth()*2)
2041 << "Child Loop BB" << FunctionNumber << "_"
2042 << (*CL)->getHeader()->getNumber() << " Depth " << (*CL)->getLoopDepth()
2044 PrintChildLoopComment(OS, *CL, FunctionNumber);
2048 /// emitBasicBlockLoopComments - Pretty-print comments for basic blocks.
2049 static void emitBasicBlockLoopComments(const MachineBasicBlock &MBB,
2050 const MachineLoopInfo *LI,
2051 const AsmPrinter &AP) {
2052 // Add loop depth information
2053 const MachineLoop *Loop = LI->getLoopFor(&MBB);
2054 if (Loop == 0) return;
2056 MachineBasicBlock *Header = Loop->getHeader();
2057 assert(Header && "No header for loop");
2059 // If this block is not a loop header, just print out what is the loop header
2061 if (Header != &MBB) {
2062 AP.OutStreamer.AddComment(" in Loop: Header=BB" +
2063 Twine(AP.getFunctionNumber())+"_" +
2064 Twine(Loop->getHeader()->getNumber())+
2065 " Depth="+Twine(Loop->getLoopDepth()));
2069 // Otherwise, it is a loop header. Print out information about child and
2071 raw_ostream &OS = AP.OutStreamer.GetCommentOS();
2073 PrintParentLoopComment(OS, Loop->getParentLoop(), AP.getFunctionNumber());
2076 OS.indent(Loop->getLoopDepth()*2-2);
2081 OS << "Loop Header: Depth=" + Twine(Loop->getLoopDepth()) << '\n';
2083 PrintChildLoopComment(OS, Loop, AP.getFunctionNumber());
2087 /// EmitBasicBlockStart - This method prints the label for the specified
2088 /// MachineBasicBlock, an alignment (if present) and a comment describing
2089 /// it if appropriate.
2090 void AsmPrinter::EmitBasicBlockStart(const MachineBasicBlock *MBB) const {
2091 // Emit an alignment directive for this block, if needed.
2092 if (unsigned Align = MBB->getAlignment())
2093 EmitAlignment(Align);
2095 // If the block has its address taken, emit any labels that were used to
2096 // reference the block. It is possible that there is more than one label
2097 // here, because multiple LLVM BB's may have been RAUW'd to this block after
2098 // the references were generated.
2099 if (MBB->hasAddressTaken()) {
2100 const BasicBlock *BB = MBB->getBasicBlock();
2102 OutStreamer.AddComment("Block address taken");
2104 std::vector<MCSymbol*> Syms = MMI->getAddrLabelSymbolToEmit(BB);
2106 for (unsigned i = 0, e = Syms.size(); i != e; ++i)
2107 OutStreamer.EmitLabel(Syms[i]);
2110 // Print some verbose block comments.
2112 if (const BasicBlock *BB = MBB->getBasicBlock())
2114 OutStreamer.AddComment("%" + BB->getName());
2115 emitBasicBlockLoopComments(*MBB, LI, *this);
2118 // Print the main label for the block.
2119 if (MBB->pred_empty() || isBlockOnlyReachableByFallthrough(MBB)) {
2120 if (isVerbose() && OutStreamer.hasRawTextSupport()) {
2121 // NOTE: Want this comment at start of line, don't emit with AddComment.
2122 OutStreamer.EmitRawText(Twine(MAI->getCommentString()) + " BB#" +
2123 Twine(MBB->getNumber()) + ":");
2126 OutStreamer.EmitLabel(MBB->getSymbol());
2130 void AsmPrinter::EmitVisibility(MCSymbol *Sym, unsigned Visibility,
2131 bool IsDefinition) const {
2132 MCSymbolAttr Attr = MCSA_Invalid;
2134 switch (Visibility) {
2136 case GlobalValue::HiddenVisibility:
2138 Attr = MAI->getHiddenVisibilityAttr();
2140 Attr = MAI->getHiddenDeclarationVisibilityAttr();
2142 case GlobalValue::ProtectedVisibility:
2143 Attr = MAI->getProtectedVisibilityAttr();
2147 if (Attr != MCSA_Invalid)
2148 OutStreamer.EmitSymbolAttribute(Sym, Attr);
2151 /// isBlockOnlyReachableByFallthough - Return true if the basic block has
2152 /// exactly one predecessor and the control transfer mechanism between
2153 /// the predecessor and this block is a fall-through.
2155 isBlockOnlyReachableByFallthrough(const MachineBasicBlock *MBB) const {
2156 // If this is a landing pad, it isn't a fall through. If it has no preds,
2157 // then nothing falls through to it.
2158 if (MBB->isLandingPad() || MBB->pred_empty())
2161 // If there isn't exactly one predecessor, it can't be a fall through.
2162 MachineBasicBlock::const_pred_iterator PI = MBB->pred_begin(), PI2 = PI;
2164 if (PI2 != MBB->pred_end())
2167 // The predecessor has to be immediately before this block.
2168 MachineBasicBlock *Pred = *PI;
2170 if (!Pred->isLayoutSuccessor(MBB))
2173 // If the block is completely empty, then it definitely does fall through.
2177 // Check the terminators in the previous blocks
2178 for (MachineBasicBlock::iterator II = Pred->getFirstTerminator(),
2179 IE = Pred->end(); II != IE; ++II) {
2180 MachineInstr &MI = *II;
2182 // If it is not a simple branch, we are in a table somewhere.
2183 if (!MI.isBranch() || MI.isIndirectBranch())
2186 // If we are the operands of one of the branches, this is not
2188 for (MachineInstr::mop_iterator OI = MI.operands_begin(),
2189 OE = MI.operands_end(); OI != OE; ++OI) {
2190 const MachineOperand& OP = *OI;
2193 if (OP.isMBB() && OP.getMBB() == MBB)
2203 GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy *S) {
2204 if (!S->usesMetadata())
2207 gcp_map_type &GCMap = getGCMap(GCMetadataPrinters);
2208 gcp_map_type::iterator GCPI = GCMap.find(S);
2209 if (GCPI != GCMap.end())
2210 return GCPI->second;
2212 const char *Name = S->getName().c_str();
2214 for (GCMetadataPrinterRegistry::iterator
2215 I = GCMetadataPrinterRegistry::begin(),
2216 E = GCMetadataPrinterRegistry::end(); I != E; ++I)
2217 if (strcmp(Name, I->getName()) == 0) {
2218 GCMetadataPrinter *GMP = I->instantiate();
2220 GCMap.insert(std::make_pair(S, GMP));
2224 report_fatal_error("no GCMetadataPrinter registered for GC: " + Twine(Name));