1 //===-- AsmPrinter.cpp - Common AsmPrinter code ---------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the AsmPrinter class.
12 //===----------------------------------------------------------------------===//
14 #define DEBUG_TYPE "asm-printer"
15 #include "llvm/CodeGen/AsmPrinter.h"
16 #include "DwarfDebug.h"
17 #include "DwarfException.h"
18 #include "llvm/Module.h"
19 #include "llvm/CodeGen/GCMetadataPrinter.h"
20 #include "llvm/CodeGen/MachineConstantPool.h"
21 #include "llvm/CodeGen/MachineFrameInfo.h"
22 #include "llvm/CodeGen/MachineFunction.h"
23 #include "llvm/CodeGen/MachineJumpTableInfo.h"
24 #include "llvm/CodeGen/MachineLoopInfo.h"
25 #include "llvm/CodeGen/MachineModuleInfo.h"
26 #include "llvm/Analysis/ConstantFolding.h"
27 #include "llvm/Analysis/DebugInfo.h"
28 #include "llvm/MC/MCAsmInfo.h"
29 #include "llvm/MC/MCContext.h"
30 #include "llvm/MC/MCExpr.h"
31 #include "llvm/MC/MCInst.h"
32 #include "llvm/MC/MCSection.h"
33 #include "llvm/MC/MCStreamer.h"
34 #include "llvm/MC/MCSymbol.h"
35 #include "llvm/Target/Mangler.h"
36 #include "llvm/Target/TargetData.h"
37 #include "llvm/Target/TargetInstrInfo.h"
38 #include "llvm/Target/TargetLowering.h"
39 #include "llvm/Target/TargetLoweringObjectFile.h"
40 #include "llvm/Target/TargetOptions.h"
41 #include "llvm/Target/TargetRegisterInfo.h"
42 #include "llvm/Assembly/Writer.h"
43 #include "llvm/ADT/SmallString.h"
44 #include "llvm/ADT/Statistic.h"
45 #include "llvm/Support/ErrorHandling.h"
46 #include "llvm/Support/Format.h"
47 #include "llvm/Support/MathExtras.h"
48 #include "llvm/Support/Timer.h"
51 static const char *DWARFGroupName = "DWARF Emission";
52 static const char *DbgTimerName = "DWARF Debug Writer";
53 static const char *EHTimerName = "DWARF Exception Writer";
55 STATISTIC(EmittedInsts, "Number of machine instrs printed");
57 char AsmPrinter::ID = 0;
59 typedef DenseMap<GCStrategy*,GCMetadataPrinter*> gcp_map_type;
60 static gcp_map_type &getGCMap(void *&P) {
62 P = new gcp_map_type();
63 return *(gcp_map_type*)P;
67 /// getGVAlignmentLog2 - Return the alignment to use for the specified global
68 /// value in log2 form. This rounds up to the preferred alignment if possible
70 static unsigned getGVAlignmentLog2(const GlobalValue *GV, const TargetData &TD,
71 unsigned InBits = 0) {
73 if (const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV))
74 NumBits = TD.getPreferredAlignmentLog(GVar);
76 // If InBits is specified, round it to it.
80 // If the GV has a specified alignment, take it into account.
81 if (GV->getAlignment() == 0)
84 unsigned GVAlign = Log2_32(GV->getAlignment());
86 // If the GVAlign is larger than NumBits, or if we are required to obey
87 // NumBits because the GV has an assigned section, obey it.
88 if (GVAlign > NumBits || GV->hasSection())
96 AsmPrinter::AsmPrinter(TargetMachine &tm, MCStreamer &Streamer)
97 : MachineFunctionPass(ID),
98 TM(tm), MAI(tm.getMCAsmInfo()),
99 OutContext(Streamer.getContext()),
100 OutStreamer(Streamer),
101 LastMI(0), LastFn(0), Counter(~0U), SetCounter(0) {
102 DD = 0; DE = 0; MMI = 0; LI = 0;
103 GCMetadataPrinters = 0;
104 VerboseAsm = Streamer.isVerboseAsm();
107 AsmPrinter::~AsmPrinter() {
108 assert(DD == 0 && DE == 0 && "Debug/EH info didn't get finalized");
110 if (GCMetadataPrinters != 0) {
111 gcp_map_type &GCMap = getGCMap(GCMetadataPrinters);
113 for (gcp_map_type::iterator I = GCMap.begin(), E = GCMap.end(); I != E; ++I)
116 GCMetadataPrinters = 0;
122 /// getFunctionNumber - Return a unique ID for the current function.
124 unsigned AsmPrinter::getFunctionNumber() const {
125 return MF->getFunctionNumber();
128 const TargetLoweringObjectFile &AsmPrinter::getObjFileLowering() const {
129 return TM.getTargetLowering()->getObjFileLowering();
133 /// getTargetData - Return information about data layout.
134 const TargetData &AsmPrinter::getTargetData() const {
135 return *TM.getTargetData();
138 /// getCurrentSection() - Return the current section we are emitting to.
139 const MCSection *AsmPrinter::getCurrentSection() const {
140 return OutStreamer.getCurrentSection();
145 void AsmPrinter::getAnalysisUsage(AnalysisUsage &AU) const {
146 AU.setPreservesAll();
147 MachineFunctionPass::getAnalysisUsage(AU);
148 AU.addRequired<MachineModuleInfo>();
149 AU.addRequired<GCModuleInfo>();
151 AU.addRequired<MachineLoopInfo>();
154 bool AsmPrinter::doInitialization(Module &M) {
155 MMI = getAnalysisIfAvailable<MachineModuleInfo>();
156 MMI->AnalyzeModule(M);
158 // Initialize TargetLoweringObjectFile.
159 const_cast<TargetLoweringObjectFile&>(getObjFileLowering())
160 .Initialize(OutContext, TM);
162 Mang = new Mangler(OutContext, *TM.getTargetData());
164 // Allow the target to emit any magic that it wants at the start of the file.
165 EmitStartOfAsmFile(M);
167 // Very minimal debug info. It is ignored if we emit actual debug info. If we
168 // don't, this at least helps the user find where a global came from.
169 if (MAI->hasSingleParameterDotFile()) {
171 OutStreamer.EmitFileDirective(M.getModuleIdentifier());
174 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
175 assert(MI && "AsmPrinter didn't require GCModuleInfo?");
176 for (GCModuleInfo::iterator I = MI->begin(), E = MI->end(); I != E; ++I)
177 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I))
178 MP->beginAssembly(*this);
180 // Emit module-level inline asm if it exists.
181 if (!M.getModuleInlineAsm().empty()) {
182 OutStreamer.AddComment("Start of file scope inline assembly");
183 OutStreamer.AddBlankLine();
184 EmitInlineAsm(M.getModuleInlineAsm()+"\n");
185 OutStreamer.AddComment("End of file scope inline assembly");
186 OutStreamer.AddBlankLine();
189 if (MAI->doesSupportDebugInformation())
190 DD = new DwarfDebug(this, &M);
192 switch (MAI->getExceptionHandlingType()) {
193 case ExceptionHandling::None:
195 case ExceptionHandling::SjLj:
196 case ExceptionHandling::DwarfCFI:
197 DE = new DwarfCFIException(this);
199 case ExceptionHandling::ARM:
200 DE = new ARMException(this);
202 case ExceptionHandling::Win64:
203 DE = new Win64Exception(this);
207 llvm_unreachable("Unknown exception type.");
210 void AsmPrinter::EmitLinkage(unsigned Linkage, MCSymbol *GVSym) const {
211 switch ((GlobalValue::LinkageTypes)Linkage) {
212 case GlobalValue::CommonLinkage:
213 case GlobalValue::LinkOnceAnyLinkage:
214 case GlobalValue::LinkOnceODRLinkage:
215 case GlobalValue::WeakAnyLinkage:
216 case GlobalValue::WeakODRLinkage:
217 case GlobalValue::LinkerPrivateWeakLinkage:
218 case GlobalValue::LinkerPrivateWeakDefAutoLinkage:
219 if (MAI->getWeakDefDirective() != 0) {
221 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
223 if ((GlobalValue::LinkageTypes)Linkage !=
224 GlobalValue::LinkerPrivateWeakDefAutoLinkage)
225 // .weak_definition _foo
226 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_WeakDefinition);
228 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_WeakDefAutoPrivate);
229 } else if (MAI->getLinkOnceDirective() != 0) {
231 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
232 //NOTE: linkonce is handled by the section the symbol was assigned to.
235 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Weak);
238 case GlobalValue::DLLExportLinkage:
239 case GlobalValue::AppendingLinkage:
240 // FIXME: appending linkage variables should go into a section of
241 // their name or something. For now, just emit them as external.
242 case GlobalValue::ExternalLinkage:
243 // If external or appending, declare as a global symbol.
245 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
247 case GlobalValue::PrivateLinkage:
248 case GlobalValue::InternalLinkage:
249 case GlobalValue::LinkerPrivateLinkage:
252 llvm_unreachable("Unknown linkage type!");
257 /// EmitGlobalVariable - Emit the specified global variable to the .s file.
258 void AsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) {
259 if (GV->hasInitializer()) {
260 // Check to see if this is a special global used by LLVM, if so, emit it.
261 if (EmitSpecialLLVMGlobal(GV))
265 WriteAsOperand(OutStreamer.GetCommentOS(), GV,
266 /*PrintType=*/false, GV->getParent());
267 OutStreamer.GetCommentOS() << '\n';
271 MCSymbol *GVSym = Mang->getSymbol(GV);
272 EmitVisibility(GVSym, GV->getVisibility(), !GV->isDeclaration());
274 if (!GV->hasInitializer()) // External globals require no extra code.
277 if (MAI->hasDotTypeDotSizeDirective())
278 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_ELF_TypeObject);
280 SectionKind GVKind = TargetLoweringObjectFile::getKindForGlobal(GV, TM);
282 const TargetData *TD = TM.getTargetData();
283 uint64_t Size = TD->getTypeAllocSize(GV->getType()->getElementType());
285 // If the alignment is specified, we *must* obey it. Overaligning a global
286 // with a specified alignment is a prompt way to break globals emitted to
287 // sections and expected to be contiguous (e.g. ObjC metadata).
288 unsigned AlignLog = getGVAlignmentLog2(GV, *TD);
290 // Handle common and BSS local symbols (.lcomm).
291 if (GVKind.isCommon() || GVKind.isBSSLocal()) {
292 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
293 unsigned Align = 1 << AlignLog;
295 // Handle common symbols.
296 if (GVKind.isCommon()) {
297 if (!getObjFileLowering().getCommDirectiveSupportsAlignment())
301 OutStreamer.EmitCommonSymbol(GVSym, Size, Align);
305 // Handle local BSS symbols.
306 if (MAI->hasMachoZeroFillDirective()) {
307 const MCSection *TheSection =
308 getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM);
309 // .zerofill __DATA, __bss, _foo, 400, 5
310 OutStreamer.EmitZerofill(TheSection, GVSym, Size, Align);
314 if (MAI->getLCOMMDirectiveType() != LCOMM::None &&
315 (MAI->getLCOMMDirectiveType() != LCOMM::NoAlignment || Align == 1)) {
317 OutStreamer.EmitLocalCommonSymbol(GVSym, Size, Align);
321 if (!getObjFileLowering().getCommDirectiveSupportsAlignment())
325 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Local);
327 OutStreamer.EmitCommonSymbol(GVSym, Size, Align);
331 const MCSection *TheSection =
332 getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM);
334 // Handle the zerofill directive on darwin, which is a special form of BSS
336 if (GVKind.isBSSExtern() && MAI->hasMachoZeroFillDirective()) {
337 if (Size == 0) Size = 1; // zerofill of 0 bytes is undefined.
340 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
341 // .zerofill __DATA, __common, _foo, 400, 5
342 OutStreamer.EmitZerofill(TheSection, GVSym, Size, 1 << AlignLog);
346 // Handle thread local data for mach-o which requires us to output an
347 // additional structure of data and mangle the original symbol so that we
348 // can reference it later.
350 // TODO: This should become an "emit thread local global" method on TLOF.
351 // All of this macho specific stuff should be sunk down into TLOFMachO and
352 // stuff like "TLSExtraDataSection" should no longer be part of the parent
353 // TLOF class. This will also make it more obvious that stuff like
354 // MCStreamer::EmitTBSSSymbol is macho specific and only called from macho
356 if (GVKind.isThreadLocal() && MAI->hasMachoTBSSDirective()) {
357 // Emit the .tbss symbol
359 OutContext.GetOrCreateSymbol(GVSym->getName() + Twine("$tlv$init"));
361 if (GVKind.isThreadBSS())
362 OutStreamer.EmitTBSSSymbol(TheSection, MangSym, Size, 1 << AlignLog);
363 else if (GVKind.isThreadData()) {
364 OutStreamer.SwitchSection(TheSection);
366 EmitAlignment(AlignLog, GV);
367 OutStreamer.EmitLabel(MangSym);
369 EmitGlobalConstant(GV->getInitializer());
372 OutStreamer.AddBlankLine();
374 // Emit the variable struct for the runtime.
375 const MCSection *TLVSect
376 = getObjFileLowering().getTLSExtraDataSection();
378 OutStreamer.SwitchSection(TLVSect);
379 // Emit the linkage here.
380 EmitLinkage(GV->getLinkage(), GVSym);
381 OutStreamer.EmitLabel(GVSym);
383 // Three pointers in size:
384 // - __tlv_bootstrap - used to make sure support exists
385 // - spare pointer, used when mapped by the runtime
386 // - pointer to mangled symbol above with initializer
387 unsigned PtrSize = TD->getPointerSizeInBits()/8;
388 OutStreamer.EmitSymbolValue(GetExternalSymbolSymbol("_tlv_bootstrap"),
390 OutStreamer.EmitIntValue(0, PtrSize, 0);
391 OutStreamer.EmitSymbolValue(MangSym, PtrSize, 0);
393 OutStreamer.AddBlankLine();
397 OutStreamer.SwitchSection(TheSection);
399 EmitLinkage(GV->getLinkage(), GVSym);
400 EmitAlignment(AlignLog, GV);
402 OutStreamer.EmitLabel(GVSym);
404 EmitGlobalConstant(GV->getInitializer());
406 if (MAI->hasDotTypeDotSizeDirective())
408 OutStreamer.EmitELFSize(GVSym, MCConstantExpr::Create(Size, OutContext));
410 OutStreamer.AddBlankLine();
413 /// EmitFunctionHeader - This method emits the header for the current
415 void AsmPrinter::EmitFunctionHeader() {
416 // Print out constants referenced by the function
419 // Print the 'header' of function.
420 const Function *F = MF->getFunction();
422 OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang, TM));
423 EmitVisibility(CurrentFnSym, F->getVisibility());
425 EmitLinkage(F->getLinkage(), CurrentFnSym);
426 EmitAlignment(MF->getAlignment(), F);
428 if (MAI->hasDotTypeDotSizeDirective())
429 OutStreamer.EmitSymbolAttribute(CurrentFnSym, MCSA_ELF_TypeFunction);
432 WriteAsOperand(OutStreamer.GetCommentOS(), F,
433 /*PrintType=*/false, F->getParent());
434 OutStreamer.GetCommentOS() << '\n';
437 // Emit the CurrentFnSym. This is a virtual function to allow targets to
438 // do their wild and crazy things as required.
439 EmitFunctionEntryLabel();
441 // If the function had address-taken blocks that got deleted, then we have
442 // references to the dangling symbols. Emit them at the start of the function
443 // so that we don't get references to undefined symbols.
444 std::vector<MCSymbol*> DeadBlockSyms;
445 MMI->takeDeletedSymbolsForFunction(F, DeadBlockSyms);
446 for (unsigned i = 0, e = DeadBlockSyms.size(); i != e; ++i) {
447 OutStreamer.AddComment("Address taken block that was later removed");
448 OutStreamer.EmitLabel(DeadBlockSyms[i]);
451 // Add some workaround for linkonce linkage on Cygwin\MinGW.
452 if (MAI->getLinkOnceDirective() != 0 &&
453 (F->hasLinkOnceLinkage() || F->hasWeakLinkage())) {
454 // FIXME: What is this?
456 OutContext.GetOrCreateSymbol(Twine("Lllvm$workaround$fake$stub$")+
457 CurrentFnSym->getName());
458 OutStreamer.EmitLabel(FakeStub);
461 // Emit pre-function debug and/or EH information.
463 NamedRegionTimer T(EHTimerName, DWARFGroupName, TimePassesIsEnabled);
464 DE->BeginFunction(MF);
467 NamedRegionTimer T(DbgTimerName, DWARFGroupName, TimePassesIsEnabled);
468 DD->beginFunction(MF);
472 /// EmitFunctionEntryLabel - Emit the label that is the entrypoint for the
473 /// function. This can be overridden by targets as required to do custom stuff.
474 void AsmPrinter::EmitFunctionEntryLabel() {
475 // The function label could have already been emitted if two symbols end up
476 // conflicting due to asm renaming. Detect this and emit an error.
477 if (CurrentFnSym->isUndefined()) {
478 OutStreamer.ForceCodeRegion();
479 return OutStreamer.EmitLabel(CurrentFnSym);
482 report_fatal_error("'" + Twine(CurrentFnSym->getName()) +
483 "' label emitted multiple times to assembly file");
487 /// EmitComments - Pretty-print comments for instructions.
488 static void EmitComments(const MachineInstr &MI, raw_ostream &CommentOS) {
489 const MachineFunction *MF = MI.getParent()->getParent();
490 const TargetMachine &TM = MF->getTarget();
492 // Check for spills and reloads
495 const MachineFrameInfo *FrameInfo = MF->getFrameInfo();
497 // We assume a single instruction only has a spill or reload, not
499 const MachineMemOperand *MMO;
500 if (TM.getInstrInfo()->isLoadFromStackSlotPostFE(&MI, FI)) {
501 if (FrameInfo->isSpillSlotObjectIndex(FI)) {
502 MMO = *MI.memoperands_begin();
503 CommentOS << MMO->getSize() << "-byte Reload\n";
505 } else if (TM.getInstrInfo()->hasLoadFromStackSlot(&MI, MMO, FI)) {
506 if (FrameInfo->isSpillSlotObjectIndex(FI))
507 CommentOS << MMO->getSize() << "-byte Folded Reload\n";
508 } else if (TM.getInstrInfo()->isStoreToStackSlotPostFE(&MI, FI)) {
509 if (FrameInfo->isSpillSlotObjectIndex(FI)) {
510 MMO = *MI.memoperands_begin();
511 CommentOS << MMO->getSize() << "-byte Spill\n";
513 } else if (TM.getInstrInfo()->hasStoreToStackSlot(&MI, MMO, FI)) {
514 if (FrameInfo->isSpillSlotObjectIndex(FI))
515 CommentOS << MMO->getSize() << "-byte Folded Spill\n";
518 // Check for spill-induced copies
519 if (MI.getAsmPrinterFlag(MachineInstr::ReloadReuse))
520 CommentOS << " Reload Reuse\n";
523 /// EmitImplicitDef - This method emits the specified machine instruction
524 /// that is an implicit def.
525 static void EmitImplicitDef(const MachineInstr *MI, AsmPrinter &AP) {
526 unsigned RegNo = MI->getOperand(0).getReg();
527 AP.OutStreamer.AddComment(Twine("implicit-def: ") +
528 AP.TM.getRegisterInfo()->getName(RegNo));
529 AP.OutStreamer.AddBlankLine();
532 static void EmitKill(const MachineInstr *MI, AsmPrinter &AP) {
533 std::string Str = "kill:";
534 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
535 const MachineOperand &Op = MI->getOperand(i);
536 assert(Op.isReg() && "KILL instruction must have only register operands");
538 Str += AP.TM.getRegisterInfo()->getName(Op.getReg());
539 Str += (Op.isDef() ? "<def>" : "<kill>");
541 AP.OutStreamer.AddComment(Str);
542 AP.OutStreamer.AddBlankLine();
545 /// EmitDebugValueComment - This method handles the target-independent form
546 /// of DBG_VALUE, returning true if it was able to do so. A false return
547 /// means the target will need to handle MI in EmitInstruction.
548 static bool EmitDebugValueComment(const MachineInstr *MI, AsmPrinter &AP) {
549 // This code handles only the 3-operand target-independent form.
550 if (MI->getNumOperands() != 3)
553 SmallString<128> Str;
554 raw_svector_ostream OS(Str);
555 OS << '\t' << AP.MAI->getCommentString() << "DEBUG_VALUE: ";
557 // cast away const; DIetc do not take const operands for some reason.
558 DIVariable V(const_cast<MDNode*>(MI->getOperand(2).getMetadata()));
559 if (V.getContext().isSubprogram())
560 OS << DISubprogram(V.getContext()).getDisplayName() << ":";
561 OS << V.getName() << " <- ";
563 // Register or immediate value. Register 0 means undef.
564 if (MI->getOperand(0).isFPImm()) {
565 APFloat APF = APFloat(MI->getOperand(0).getFPImm()->getValueAPF());
566 if (MI->getOperand(0).getFPImm()->getType()->isFloatTy()) {
567 OS << (double)APF.convertToFloat();
568 } else if (MI->getOperand(0).getFPImm()->getType()->isDoubleTy()) {
569 OS << APF.convertToDouble();
571 // There is no good way to print long double. Convert a copy to
572 // double. Ah well, it's only a comment.
574 APF.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven,
576 OS << "(long double) " << APF.convertToDouble();
578 } else if (MI->getOperand(0).isImm()) {
579 OS << MI->getOperand(0).getImm();
580 } else if (MI->getOperand(0).isCImm()) {
581 MI->getOperand(0).getCImm()->getValue().print(OS, false /*isSigned*/);
583 assert(MI->getOperand(0).isReg() && "Unknown operand type");
584 if (MI->getOperand(0).getReg() == 0) {
585 // Suppress offset, it is not meaningful here.
587 // NOTE: Want this comment at start of line, don't emit with AddComment.
588 AP.OutStreamer.EmitRawText(OS.str());
591 OS << AP.TM.getRegisterInfo()->getName(MI->getOperand(0).getReg());
594 OS << '+' << MI->getOperand(1).getImm();
595 // NOTE: Want this comment at start of line, don't emit with AddComment.
596 AP.OutStreamer.EmitRawText(OS.str());
600 AsmPrinter::CFIMoveType AsmPrinter::needsCFIMoves() {
601 if (MAI->getExceptionHandlingType() == ExceptionHandling::DwarfCFI &&
602 MF->getFunction()->needsUnwindTableEntry())
605 if (MMI->hasDebugInfo())
611 bool AsmPrinter::needsSEHMoves() {
612 return MAI->getExceptionHandlingType() == ExceptionHandling::Win64 &&
613 MF->getFunction()->needsUnwindTableEntry();
616 bool AsmPrinter::needsRelocationsForDwarfStringPool() const {
617 return MAI->doesDwarfUseRelocationsForStringPool();
620 void AsmPrinter::emitPrologLabel(const MachineInstr &MI) {
621 MCSymbol *Label = MI.getOperand(0).getMCSymbol();
623 if (MAI->getExceptionHandlingType() != ExceptionHandling::DwarfCFI)
626 if (needsCFIMoves() == CFI_M_None)
629 if (MMI->getCompactUnwindEncoding() != 0)
630 OutStreamer.EmitCompactUnwindEncoding(MMI->getCompactUnwindEncoding());
632 MachineModuleInfo &MMI = MF->getMMI();
633 std::vector<MachineMove> &Moves = MMI.getFrameMoves();
634 bool FoundOne = false;
636 for (std::vector<MachineMove>::iterator I = Moves.begin(),
637 E = Moves.end(); I != E; ++I) {
638 if (I->getLabel() == Label) {
639 EmitCFIFrameMove(*I);
646 /// EmitFunctionBody - This method emits the body and trailer for a
648 void AsmPrinter::EmitFunctionBody() {
649 // Emit target-specific gunk before the function body.
650 EmitFunctionBodyStart();
652 bool ShouldPrintDebugScopes = DD && MMI->hasDebugInfo();
654 // Print out code for the function.
655 bool HasAnyRealCode = false;
656 const MachineInstr *LastMI = 0;
657 for (MachineFunction::const_iterator I = MF->begin(), E = MF->end();
659 // Print a label for the basic block.
660 EmitBasicBlockStart(I);
661 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
665 // Print the assembly for the instruction.
666 if (!II->isLabel() && !II->isImplicitDef() && !II->isKill() &&
667 !II->isDebugValue()) {
668 HasAnyRealCode = true;
672 if (ShouldPrintDebugScopes) {
673 NamedRegionTimer T(DbgTimerName, DWARFGroupName, TimePassesIsEnabled);
674 DD->beginInstruction(II);
678 EmitComments(*II, OutStreamer.GetCommentOS());
680 switch (II->getOpcode()) {
681 case TargetOpcode::PROLOG_LABEL:
682 emitPrologLabel(*II);
685 case TargetOpcode::EH_LABEL:
686 case TargetOpcode::GC_LABEL:
687 OutStreamer.EmitLabel(II->getOperand(0).getMCSymbol());
689 case TargetOpcode::INLINEASM:
692 case TargetOpcode::DBG_VALUE:
694 if (!EmitDebugValueComment(II, *this))
698 case TargetOpcode::IMPLICIT_DEF:
699 if (isVerbose()) EmitImplicitDef(II, *this);
701 case TargetOpcode::KILL:
702 if (isVerbose()) EmitKill(II, *this);
705 if (!TM.hasMCUseLoc())
706 MCLineEntry::Make(&OutStreamer, getCurrentSection());
712 if (ShouldPrintDebugScopes) {
713 NamedRegionTimer T(DbgTimerName, DWARFGroupName, TimePassesIsEnabled);
714 DD->endInstruction(II);
719 // If the last instruction was a prolog label, then we have a situation where
720 // we emitted a prolog but no function body. This results in the ending prolog
721 // label equaling the end of function label and an invalid "row" in the
722 // FDE. We need to emit a noop in this situation so that the FDE's rows are
724 bool RequiresNoop = LastMI && LastMI->isPrologLabel();
726 // If the function is empty and the object file uses .subsections_via_symbols,
727 // then we need to emit *something* to the function body to prevent the
728 // labels from collapsing together. Just emit a noop.
729 if ((MAI->hasSubsectionsViaSymbols() && !HasAnyRealCode) || RequiresNoop) {
731 TM.getInstrInfo()->getNoopForMachoTarget(Noop);
732 if (Noop.getOpcode()) {
733 OutStreamer.AddComment("avoids zero-length function");
734 OutStreamer.EmitInstruction(Noop);
735 } else // Target not mc-ized yet.
736 OutStreamer.EmitRawText(StringRef("\tnop\n"));
739 const Function *F = MF->getFunction();
740 for (Function::const_iterator i = F->begin(), e = F->end(); i != e; ++i) {
741 const BasicBlock *BB = i;
742 if (!BB->hasAddressTaken())
744 MCSymbol *Sym = GetBlockAddressSymbol(BB);
745 if (Sym->isDefined())
747 OutStreamer.AddComment("Address of block that was removed by CodeGen");
748 OutStreamer.EmitLabel(Sym);
751 // Emit target-specific gunk after the function body.
752 EmitFunctionBodyEnd();
754 // If the target wants a .size directive for the size of the function, emit
756 if (MAI->hasDotTypeDotSizeDirective()) {
757 // Create a symbol for the end of function, so we can get the size as
758 // difference between the function label and the temp label.
759 MCSymbol *FnEndLabel = OutContext.CreateTempSymbol();
760 OutStreamer.EmitLabel(FnEndLabel);
762 const MCExpr *SizeExp =
763 MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(FnEndLabel, OutContext),
764 MCSymbolRefExpr::Create(CurrentFnSym, OutContext),
766 OutStreamer.EmitELFSize(CurrentFnSym, SizeExp);
769 // Emit post-function debug information.
771 NamedRegionTimer T(DbgTimerName, DWARFGroupName, TimePassesIsEnabled);
775 NamedRegionTimer T(EHTimerName, DWARFGroupName, TimePassesIsEnabled);
780 // Print out jump tables referenced by the function.
783 OutStreamer.AddBlankLine();
786 /// getDebugValueLocation - Get location information encoded by DBG_VALUE
788 MachineLocation AsmPrinter::
789 getDebugValueLocation(const MachineInstr *MI) const {
790 // Target specific DBG_VALUE instructions are handled by each target.
791 return MachineLocation();
794 /// EmitDwarfRegOp - Emit dwarf register operation.
795 void AsmPrinter::EmitDwarfRegOp(const MachineLocation &MLoc) const {
796 const TargetRegisterInfo *TRI = TM.getRegisterInfo();
797 int Reg = TRI->getDwarfRegNum(MLoc.getReg(), false);
799 for (const unsigned *SR = TRI->getSuperRegisters(MLoc.getReg());
800 *SR && Reg < 0; ++SR) {
801 Reg = TRI->getDwarfRegNum(*SR, false);
802 // FIXME: Get the bit range this register uses of the superregister
803 // so that we can produce a DW_OP_bit_piece
806 // FIXME: Handle cases like a super register being encoded as
807 // DW_OP_reg 32 DW_OP_piece 4 DW_OP_reg 33
809 // FIXME: We have no reasonable way of handling errors in here. The
810 // caller might be in the middle of an dwarf expression. We should
811 // probably assert that Reg >= 0 once debug info generation is more mature.
813 if (int Offset = MLoc.getOffset()) {
815 OutStreamer.AddComment(
816 dwarf::OperationEncodingString(dwarf::DW_OP_breg0 + Reg));
817 EmitInt8(dwarf::DW_OP_breg0 + Reg);
819 OutStreamer.AddComment("DW_OP_bregx");
820 EmitInt8(dwarf::DW_OP_bregx);
821 OutStreamer.AddComment(Twine(Reg));
827 OutStreamer.AddComment(
828 dwarf::OperationEncodingString(dwarf::DW_OP_reg0 + Reg));
829 EmitInt8(dwarf::DW_OP_reg0 + Reg);
831 OutStreamer.AddComment("DW_OP_regx");
832 EmitInt8(dwarf::DW_OP_regx);
833 OutStreamer.AddComment(Twine(Reg));
838 // FIXME: Produce a DW_OP_bit_piece if we used a superregister
841 bool AsmPrinter::doFinalization(Module &M) {
842 // Emit global variables.
843 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
845 EmitGlobalVariable(I);
847 // Emit visibility info for declarations
848 for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I) {
849 const Function &F = *I;
850 if (!F.isDeclaration())
852 GlobalValue::VisibilityTypes V = F.getVisibility();
853 if (V == GlobalValue::DefaultVisibility)
856 MCSymbol *Name = Mang->getSymbol(&F);
857 EmitVisibility(Name, V, false);
860 // Finalize debug and EH information.
863 NamedRegionTimer T(EHTimerName, DWARFGroupName, TimePassesIsEnabled);
870 NamedRegionTimer T(DbgTimerName, DWARFGroupName, TimePassesIsEnabled);
876 // If the target wants to know about weak references, print them all.
877 if (MAI->getWeakRefDirective()) {
878 // FIXME: This is not lazy, it would be nice to only print weak references
879 // to stuff that is actually used. Note that doing so would require targets
880 // to notice uses in operands (due to constant exprs etc). This should
881 // happen with the MC stuff eventually.
883 // Print out module-level global variables here.
884 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
886 if (!I->hasExternalWeakLinkage()) continue;
887 OutStreamer.EmitSymbolAttribute(Mang->getSymbol(I), MCSA_WeakReference);
890 for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I) {
891 if (!I->hasExternalWeakLinkage()) continue;
892 OutStreamer.EmitSymbolAttribute(Mang->getSymbol(I), MCSA_WeakReference);
896 if (MAI->hasSetDirective()) {
897 OutStreamer.AddBlankLine();
898 for (Module::const_alias_iterator I = M.alias_begin(), E = M.alias_end();
900 MCSymbol *Name = Mang->getSymbol(I);
902 const GlobalValue *GV = I->getAliasedGlobal();
903 MCSymbol *Target = Mang->getSymbol(GV);
905 if (I->hasExternalLinkage() || !MAI->getWeakRefDirective())
906 OutStreamer.EmitSymbolAttribute(Name, MCSA_Global);
907 else if (I->hasWeakLinkage())
908 OutStreamer.EmitSymbolAttribute(Name, MCSA_WeakReference);
910 assert(I->hasLocalLinkage() && "Invalid alias linkage");
912 EmitVisibility(Name, I->getVisibility());
914 // Emit the directives as assignments aka .set:
915 OutStreamer.EmitAssignment(Name,
916 MCSymbolRefExpr::Create(Target, OutContext));
920 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
921 assert(MI && "AsmPrinter didn't require GCModuleInfo?");
922 for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; )
923 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*--I))
924 MP->finishAssembly(*this);
926 // If we don't have any trampolines, then we don't require stack memory
927 // to be executable. Some targets have a directive to declare this.
928 Function *InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline");
929 if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty())
930 if (const MCSection *S = MAI->getNonexecutableStackSection(OutContext))
931 OutStreamer.SwitchSection(S);
933 // Allow the target to emit any magic that it wants at the end of the file,
934 // after everything else has gone out.
937 delete Mang; Mang = 0;
940 OutStreamer.Finish();
944 void AsmPrinter::SetupMachineFunction(MachineFunction &MF) {
946 // Get the function symbol.
947 CurrentFnSym = Mang->getSymbol(MF.getFunction());
950 LI = &getAnalysis<MachineLoopInfo>();
954 // SectionCPs - Keep track the alignment, constpool entries per Section.
958 SmallVector<unsigned, 4> CPEs;
959 SectionCPs(const MCSection *s, unsigned a) : S(s), Alignment(a) {}
963 /// EmitConstantPool - Print to the current output stream assembly
964 /// representations of the constants in the constant pool MCP. This is
965 /// used to print out constants which have been "spilled to memory" by
966 /// the code generator.
968 void AsmPrinter::EmitConstantPool() {
969 const MachineConstantPool *MCP = MF->getConstantPool();
970 const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
971 if (CP.empty()) return;
973 // Calculate sections for constant pool entries. We collect entries to go into
974 // the same section together to reduce amount of section switch statements.
975 SmallVector<SectionCPs, 4> CPSections;
976 for (unsigned i = 0, e = CP.size(); i != e; ++i) {
977 const MachineConstantPoolEntry &CPE = CP[i];
978 unsigned Align = CPE.getAlignment();
981 switch (CPE.getRelocationInfo()) {
982 default: llvm_unreachable("Unknown section kind");
983 case 2: Kind = SectionKind::getReadOnlyWithRel(); break;
985 Kind = SectionKind::getReadOnlyWithRelLocal();
988 switch (TM.getTargetData()->getTypeAllocSize(CPE.getType())) {
989 case 4: Kind = SectionKind::getMergeableConst4(); break;
990 case 8: Kind = SectionKind::getMergeableConst8(); break;
991 case 16: Kind = SectionKind::getMergeableConst16();break;
992 default: Kind = SectionKind::getMergeableConst(); break;
996 const MCSection *S = getObjFileLowering().getSectionForConstant(Kind);
998 // The number of sections are small, just do a linear search from the
999 // last section to the first.
1001 unsigned SecIdx = CPSections.size();
1002 while (SecIdx != 0) {
1003 if (CPSections[--SecIdx].S == S) {
1009 SecIdx = CPSections.size();
1010 CPSections.push_back(SectionCPs(S, Align));
1013 if (Align > CPSections[SecIdx].Alignment)
1014 CPSections[SecIdx].Alignment = Align;
1015 CPSections[SecIdx].CPEs.push_back(i);
1018 // Now print stuff into the calculated sections.
1019 for (unsigned i = 0, e = CPSections.size(); i != e; ++i) {
1020 OutStreamer.SwitchSection(CPSections[i].S);
1021 EmitAlignment(Log2_32(CPSections[i].Alignment));
1023 unsigned Offset = 0;
1024 for (unsigned j = 0, ee = CPSections[i].CPEs.size(); j != ee; ++j) {
1025 unsigned CPI = CPSections[i].CPEs[j];
1026 MachineConstantPoolEntry CPE = CP[CPI];
1028 // Emit inter-object padding for alignment.
1029 unsigned AlignMask = CPE.getAlignment() - 1;
1030 unsigned NewOffset = (Offset + AlignMask) & ~AlignMask;
1031 OutStreamer.EmitFill(NewOffset - Offset, 0/*fillval*/, 0/*addrspace*/);
1033 Type *Ty = CPE.getType();
1034 Offset = NewOffset + TM.getTargetData()->getTypeAllocSize(Ty);
1035 OutStreamer.EmitLabel(GetCPISymbol(CPI));
1037 if (CPE.isMachineConstantPoolEntry())
1038 EmitMachineConstantPoolValue(CPE.Val.MachineCPVal);
1040 EmitGlobalConstant(CPE.Val.ConstVal);
1045 /// EmitJumpTableInfo - Print assembly representations of the jump tables used
1046 /// by the current function to the current output stream.
1048 void AsmPrinter::EmitJumpTableInfo() {
1049 const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo();
1050 if (MJTI == 0) return;
1051 if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_Inline) return;
1052 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
1053 if (JT.empty()) return;
1055 // Pick the directive to use to print the jump table entries, and switch to
1056 // the appropriate section.
1057 const Function *F = MF->getFunction();
1058 bool JTInDiffSection = false;
1059 if (// In PIC mode, we need to emit the jump table to the same section as the
1060 // function body itself, otherwise the label differences won't make sense.
1061 // FIXME: Need a better predicate for this: what about custom entries?
1062 MJTI->getEntryKind() == MachineJumpTableInfo::EK_LabelDifference32 ||
1063 // We should also do if the section name is NULL or function is declared
1064 // in discardable section
1065 // FIXME: this isn't the right predicate, should be based on the MCSection
1066 // for the function.
1067 F->isWeakForLinker()) {
1068 OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F,Mang,TM));
1070 // Otherwise, drop it in the readonly section.
1071 const MCSection *ReadOnlySection =
1072 getObjFileLowering().getSectionForConstant(SectionKind::getReadOnly());
1073 OutStreamer.SwitchSection(ReadOnlySection);
1074 JTInDiffSection = true;
1077 EmitAlignment(Log2_32(MJTI->getEntryAlignment(*TM.getTargetData())));
1079 // If we know the form of the jump table, go ahead and tag it as such.
1080 if (!JTInDiffSection) {
1081 if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_LabelDifference32) {
1082 OutStreamer.EmitJumpTable32Region();
1084 OutStreamer.EmitDataRegion();
1088 for (unsigned JTI = 0, e = JT.size(); JTI != e; ++JTI) {
1089 const std::vector<MachineBasicBlock*> &JTBBs = JT[JTI].MBBs;
1091 // If this jump table was deleted, ignore it.
1092 if (JTBBs.empty()) continue;
1094 // For the EK_LabelDifference32 entry, if the target supports .set, emit a
1095 // .set directive for each unique entry. This reduces the number of
1096 // relocations the assembler will generate for the jump table.
1097 if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_LabelDifference32 &&
1098 MAI->hasSetDirective()) {
1099 SmallPtrSet<const MachineBasicBlock*, 16> EmittedSets;
1100 const TargetLowering *TLI = TM.getTargetLowering();
1101 const MCExpr *Base = TLI->getPICJumpTableRelocBaseExpr(MF,JTI,OutContext);
1102 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
1103 const MachineBasicBlock *MBB = JTBBs[ii];
1104 if (!EmittedSets.insert(MBB)) continue;
1106 // .set LJTSet, LBB32-base
1108 MCSymbolRefExpr::Create(MBB->getSymbol(), OutContext);
1109 OutStreamer.EmitAssignment(GetJTSetSymbol(JTI, MBB->getNumber()),
1110 MCBinaryExpr::CreateSub(LHS, Base, OutContext));
1114 // On some targets (e.g. Darwin) we want to emit two consecutive labels
1115 // before each jump table. The first label is never referenced, but tells
1116 // the assembler and linker the extents of the jump table object. The
1117 // second label is actually referenced by the code.
1118 if (JTInDiffSection && MAI->getLinkerPrivateGlobalPrefix()[0])
1119 // FIXME: This doesn't have to have any specific name, just any randomly
1120 // named and numbered 'l' label would work. Simplify GetJTISymbol.
1121 OutStreamer.EmitLabel(GetJTISymbol(JTI, true));
1123 OutStreamer.EmitLabel(GetJTISymbol(JTI));
1125 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
1126 EmitJumpTableEntry(MJTI, JTBBs[ii], JTI);
1130 /// EmitJumpTableEntry - Emit a jump table entry for the specified MBB to the
1132 void AsmPrinter::EmitJumpTableEntry(const MachineJumpTableInfo *MJTI,
1133 const MachineBasicBlock *MBB,
1134 unsigned UID) const {
1135 assert(MBB && MBB->getNumber() >= 0 && "Invalid basic block");
1136 const MCExpr *Value = 0;
1137 switch (MJTI->getEntryKind()) {
1138 case MachineJumpTableInfo::EK_Inline:
1139 llvm_unreachable("Cannot emit EK_Inline jump table entry");
1140 case MachineJumpTableInfo::EK_Custom32:
1141 Value = TM.getTargetLowering()->LowerCustomJumpTableEntry(MJTI, MBB, UID,
1144 case MachineJumpTableInfo::EK_BlockAddress:
1145 // EK_BlockAddress - Each entry is a plain address of block, e.g.:
1147 Value = MCSymbolRefExpr::Create(MBB->getSymbol(), OutContext);
1149 case MachineJumpTableInfo::EK_GPRel32BlockAddress: {
1150 // EK_GPRel32BlockAddress - Each entry is an address of block, encoded
1151 // with a relocation as gp-relative, e.g.:
1153 MCSymbol *MBBSym = MBB->getSymbol();
1154 OutStreamer.EmitGPRel32Value(MCSymbolRefExpr::Create(MBBSym, OutContext));
1158 case MachineJumpTableInfo::EK_LabelDifference32: {
1159 // EK_LabelDifference32 - Each entry is the address of the block minus
1160 // the address of the jump table. This is used for PIC jump tables where
1161 // gprel32 is not supported. e.g.:
1162 // .word LBB123 - LJTI1_2
1163 // If the .set directive is supported, this is emitted as:
1164 // .set L4_5_set_123, LBB123 - LJTI1_2
1165 // .word L4_5_set_123
1167 // If we have emitted set directives for the jump table entries, print
1168 // them rather than the entries themselves. If we're emitting PIC, then
1169 // emit the table entries as differences between two text section labels.
1170 if (MAI->hasSetDirective()) {
1171 // If we used .set, reference the .set's symbol.
1172 Value = MCSymbolRefExpr::Create(GetJTSetSymbol(UID, MBB->getNumber()),
1176 // Otherwise, use the difference as the jump table entry.
1177 Value = MCSymbolRefExpr::Create(MBB->getSymbol(), OutContext);
1178 const MCExpr *JTI = MCSymbolRefExpr::Create(GetJTISymbol(UID), OutContext);
1179 Value = MCBinaryExpr::CreateSub(Value, JTI, OutContext);
1184 assert(Value && "Unknown entry kind!");
1186 unsigned EntrySize = MJTI->getEntrySize(*TM.getTargetData());
1187 OutStreamer.EmitValue(Value, EntrySize, /*addrspace*/0);
1191 /// EmitSpecialLLVMGlobal - Check to see if the specified global is a
1192 /// special global used by LLVM. If so, emit it and return true, otherwise
1193 /// do nothing and return false.
1194 bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
1195 if (GV->getName() == "llvm.used") {
1196 if (MAI->hasNoDeadStrip()) // No need to emit this at all.
1197 EmitLLVMUsedList(GV->getInitializer());
1201 // Ignore debug and non-emitted data. This handles llvm.compiler.used.
1202 if (GV->getSection() == "llvm.metadata" ||
1203 GV->hasAvailableExternallyLinkage())
1206 if (!GV->hasAppendingLinkage()) return false;
1208 assert(GV->hasInitializer() && "Not a special LLVM global!");
1210 if (GV->getName() == "llvm.global_ctors") {
1211 EmitXXStructorList(GV->getInitializer(), /* isCtor */ true);
1213 if (TM.getRelocationModel() == Reloc::Static &&
1214 MAI->hasStaticCtorDtorReferenceInStaticMode()) {
1215 StringRef Sym(".constructors_used");
1216 OutStreamer.EmitSymbolAttribute(OutContext.GetOrCreateSymbol(Sym),
1222 if (GV->getName() == "llvm.global_dtors") {
1223 EmitXXStructorList(GV->getInitializer(), /* isCtor */ false);
1225 if (TM.getRelocationModel() == Reloc::Static &&
1226 MAI->hasStaticCtorDtorReferenceInStaticMode()) {
1227 StringRef Sym(".destructors_used");
1228 OutStreamer.EmitSymbolAttribute(OutContext.GetOrCreateSymbol(Sym),
1237 /// EmitLLVMUsedList - For targets that define a MAI::UsedDirective, mark each
1238 /// global in the specified llvm.used list for which emitUsedDirectiveFor
1239 /// is true, as being used with this directive.
1240 void AsmPrinter::EmitLLVMUsedList(const Constant *List) {
1241 // Should be an array of 'i8*'.
1242 const ConstantArray *InitList = dyn_cast<ConstantArray>(List);
1243 if (InitList == 0) return;
1245 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
1246 const GlobalValue *GV =
1247 dyn_cast<GlobalValue>(InitList->getOperand(i)->stripPointerCasts());
1248 if (GV && getObjFileLowering().shouldEmitUsedDirectiveFor(GV, Mang))
1249 OutStreamer.EmitSymbolAttribute(Mang->getSymbol(GV), MCSA_NoDeadStrip);
1253 typedef std::pair<unsigned, Constant*> Structor;
1255 static bool priority_order(const Structor& lhs, const Structor& rhs) {
1256 return lhs.first < rhs.first;
1259 /// EmitXXStructorList - Emit the ctor or dtor list taking into account the init
1261 void AsmPrinter::EmitXXStructorList(const Constant *List, bool isCtor) {
1262 // Should be an array of '{ int, void ()* }' structs. The first value is the
1264 if (!isa<ConstantArray>(List)) return;
1266 // Sanity check the structors list.
1267 const ConstantArray *InitList = dyn_cast<ConstantArray>(List);
1268 if (!InitList) return; // Not an array!
1269 StructType *ETy = dyn_cast<StructType>(InitList->getType()->getElementType());
1270 if (!ETy || ETy->getNumElements() != 2) return; // Not an array of pairs!
1271 if (!isa<IntegerType>(ETy->getTypeAtIndex(0U)) ||
1272 !isa<PointerType>(ETy->getTypeAtIndex(1U))) return; // Not (int, ptr).
1274 // Gather the structors in a form that's convenient for sorting by priority.
1275 SmallVector<Structor, 8> Structors;
1276 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
1277 ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i));
1278 if (!CS) continue; // Malformed.
1279 if (CS->getOperand(1)->isNullValue())
1280 break; // Found a null terminator, skip the rest.
1281 ConstantInt *Priority = dyn_cast<ConstantInt>(CS->getOperand(0));
1282 if (!Priority) continue; // Malformed.
1283 Structors.push_back(std::make_pair(Priority->getLimitedValue(65535),
1284 CS->getOperand(1)));
1287 // Emit the function pointers in the target-specific order
1288 const TargetData *TD = TM.getTargetData();
1289 unsigned Align = Log2_32(TD->getPointerPrefAlignment());
1290 std::stable_sort(Structors.begin(), Structors.end(), priority_order);
1291 for (unsigned i = 0, e = Structors.size(); i != e; ++i) {
1292 const MCSection *OutputSection =
1294 getObjFileLowering().getStaticCtorSection(Structors[i].first) :
1295 getObjFileLowering().getStaticDtorSection(Structors[i].first));
1296 OutStreamer.SwitchSection(OutputSection);
1297 if (OutStreamer.getCurrentSection() != OutStreamer.getPreviousSection())
1298 EmitAlignment(Align);
1299 EmitXXStructor(Structors[i].second);
1303 //===--------------------------------------------------------------------===//
1304 // Emission and print routines
1307 /// EmitInt8 - Emit a byte directive and value.
1309 void AsmPrinter::EmitInt8(int Value) const {
1310 OutStreamer.EmitIntValue(Value, 1, 0/*addrspace*/);
1313 /// EmitInt16 - Emit a short directive and value.
1315 void AsmPrinter::EmitInt16(int Value) const {
1316 OutStreamer.EmitIntValue(Value, 2, 0/*addrspace*/);
1319 /// EmitInt32 - Emit a long directive and value.
1321 void AsmPrinter::EmitInt32(int Value) const {
1322 OutStreamer.EmitIntValue(Value, 4, 0/*addrspace*/);
1325 /// EmitLabelDifference - Emit something like ".long Hi-Lo" where the size
1326 /// in bytes of the directive is specified by Size and Hi/Lo specify the
1327 /// labels. This implicitly uses .set if it is available.
1328 void AsmPrinter::EmitLabelDifference(const MCSymbol *Hi, const MCSymbol *Lo,
1329 unsigned Size) const {
1330 // Get the Hi-Lo expression.
1331 const MCExpr *Diff =
1332 MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(Hi, OutContext),
1333 MCSymbolRefExpr::Create(Lo, OutContext),
1336 if (!MAI->hasSetDirective()) {
1337 OutStreamer.EmitValue(Diff, Size, 0/*AddrSpace*/);
1341 // Otherwise, emit with .set (aka assignment).
1342 MCSymbol *SetLabel = GetTempSymbol("set", SetCounter++);
1343 OutStreamer.EmitAssignment(SetLabel, Diff);
1344 OutStreamer.EmitSymbolValue(SetLabel, Size, 0/*AddrSpace*/);
1347 /// EmitLabelOffsetDifference - Emit something like ".long Hi+Offset-Lo"
1348 /// where the size in bytes of the directive is specified by Size and Hi/Lo
1349 /// specify the labels. This implicitly uses .set if it is available.
1350 void AsmPrinter::EmitLabelOffsetDifference(const MCSymbol *Hi, uint64_t Offset,
1351 const MCSymbol *Lo, unsigned Size)
1354 // Emit Hi+Offset - Lo
1355 // Get the Hi+Offset expression.
1356 const MCExpr *Plus =
1357 MCBinaryExpr::CreateAdd(MCSymbolRefExpr::Create(Hi, OutContext),
1358 MCConstantExpr::Create(Offset, OutContext),
1361 // Get the Hi+Offset-Lo expression.
1362 const MCExpr *Diff =
1363 MCBinaryExpr::CreateSub(Plus,
1364 MCSymbolRefExpr::Create(Lo, OutContext),
1367 if (!MAI->hasSetDirective())
1368 OutStreamer.EmitValue(Diff, 4, 0/*AddrSpace*/);
1370 // Otherwise, emit with .set (aka assignment).
1371 MCSymbol *SetLabel = GetTempSymbol("set", SetCounter++);
1372 OutStreamer.EmitAssignment(SetLabel, Diff);
1373 OutStreamer.EmitSymbolValue(SetLabel, 4, 0/*AddrSpace*/);
1377 /// EmitLabelPlusOffset - Emit something like ".long Label+Offset"
1378 /// where the size in bytes of the directive is specified by Size and Label
1379 /// specifies the label. This implicitly uses .set if it is available.
1380 void AsmPrinter::EmitLabelPlusOffset(const MCSymbol *Label, uint64_t Offset,
1384 // Emit Label+Offset
1385 const MCExpr *Plus =
1386 MCBinaryExpr::CreateAdd(MCSymbolRefExpr::Create(Label, OutContext),
1387 MCConstantExpr::Create(Offset, OutContext),
1390 OutStreamer.EmitValue(Plus, 4, 0/*AddrSpace*/);
1394 //===----------------------------------------------------------------------===//
1396 // EmitAlignment - Emit an alignment directive to the specified power of
1397 // two boundary. For example, if you pass in 3 here, you will get an 8
1398 // byte alignment. If a global value is specified, and if that global has
1399 // an explicit alignment requested, it will override the alignment request
1400 // if required for correctness.
1402 void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV) const {
1403 if (GV) NumBits = getGVAlignmentLog2(GV, *TM.getTargetData(), NumBits);
1405 if (NumBits == 0) return; // 1-byte aligned: no need to emit alignment.
1407 if (getCurrentSection()->getKind().isText())
1408 OutStreamer.EmitCodeAlignment(1 << NumBits);
1410 OutStreamer.EmitValueToAlignment(1 << NumBits, 0, 1, 0);
1413 //===----------------------------------------------------------------------===//
1414 // Constant emission.
1415 //===----------------------------------------------------------------------===//
1417 /// LowerConstant - Lower the specified LLVM Constant to an MCExpr.
1419 static const MCExpr *LowerConstant(const Constant *CV, AsmPrinter &AP) {
1420 MCContext &Ctx = AP.OutContext;
1422 if (CV->isNullValue() || isa<UndefValue>(CV))
1423 return MCConstantExpr::Create(0, Ctx);
1425 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV))
1426 return MCConstantExpr::Create(CI->getZExtValue(), Ctx);
1428 if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV))
1429 return MCSymbolRefExpr::Create(AP.Mang->getSymbol(GV), Ctx);
1431 if (const BlockAddress *BA = dyn_cast<BlockAddress>(CV))
1432 return MCSymbolRefExpr::Create(AP.GetBlockAddressSymbol(BA), Ctx);
1434 const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV);
1436 llvm_unreachable("Unknown constant value to lower!");
1439 switch (CE->getOpcode()) {
1441 // If the code isn't optimized, there may be outstanding folding
1442 // opportunities. Attempt to fold the expression using TargetData as a
1443 // last resort before giving up.
1445 ConstantFoldConstantExpression(CE, AP.TM.getTargetData()))
1447 return LowerConstant(C, AP);
1449 // Otherwise report the problem to the user.
1452 raw_string_ostream OS(S);
1453 OS << "Unsupported expression in static initializer: ";
1454 WriteAsOperand(OS, CE, /*PrintType=*/false,
1455 !AP.MF ? 0 : AP.MF->getFunction()->getParent());
1456 report_fatal_error(OS.str());
1458 case Instruction::GetElementPtr: {
1459 const TargetData &TD = *AP.TM.getTargetData();
1460 // Generate a symbolic expression for the byte address
1461 const Constant *PtrVal = CE->getOperand(0);
1462 SmallVector<Value*, 8> IdxVec(CE->op_begin()+1, CE->op_end());
1463 int64_t Offset = TD.getIndexedOffset(PtrVal->getType(), IdxVec);
1465 const MCExpr *Base = LowerConstant(CE->getOperand(0), AP);
1469 // Truncate/sext the offset to the pointer size.
1470 if (TD.getPointerSizeInBits() != 64) {
1471 int SExtAmount = 64-TD.getPointerSizeInBits();
1472 Offset = (Offset << SExtAmount) >> SExtAmount;
1475 return MCBinaryExpr::CreateAdd(Base, MCConstantExpr::Create(Offset, Ctx),
1479 case Instruction::Trunc:
1480 // We emit the value and depend on the assembler to truncate the generated
1481 // expression properly. This is important for differences between
1482 // blockaddress labels. Since the two labels are in the same function, it
1483 // is reasonable to treat their delta as a 32-bit value.
1485 case Instruction::BitCast:
1486 return LowerConstant(CE->getOperand(0), AP);
1488 case Instruction::IntToPtr: {
1489 const TargetData &TD = *AP.TM.getTargetData();
1490 // Handle casts to pointers by changing them into casts to the appropriate
1491 // integer type. This promotes constant folding and simplifies this code.
1492 Constant *Op = CE->getOperand(0);
1493 Op = ConstantExpr::getIntegerCast(Op, TD.getIntPtrType(CV->getContext()),
1495 return LowerConstant(Op, AP);
1498 case Instruction::PtrToInt: {
1499 const TargetData &TD = *AP.TM.getTargetData();
1500 // Support only foldable casts to/from pointers that can be eliminated by
1501 // changing the pointer to the appropriately sized integer type.
1502 Constant *Op = CE->getOperand(0);
1503 Type *Ty = CE->getType();
1505 const MCExpr *OpExpr = LowerConstant(Op, AP);
1507 // We can emit the pointer value into this slot if the slot is an
1508 // integer slot equal to the size of the pointer.
1509 if (TD.getTypeAllocSize(Ty) == TD.getTypeAllocSize(Op->getType()))
1512 // Otherwise the pointer is smaller than the resultant integer, mask off
1513 // the high bits so we are sure to get a proper truncation if the input is
1515 unsigned InBits = TD.getTypeAllocSizeInBits(Op->getType());
1516 const MCExpr *MaskExpr = MCConstantExpr::Create(~0ULL >> (64-InBits), Ctx);
1517 return MCBinaryExpr::CreateAnd(OpExpr, MaskExpr, Ctx);
1520 // The MC library also has a right-shift operator, but it isn't consistently
1521 // signed or unsigned between different targets.
1522 case Instruction::Add:
1523 case Instruction::Sub:
1524 case Instruction::Mul:
1525 case Instruction::SDiv:
1526 case Instruction::SRem:
1527 case Instruction::Shl:
1528 case Instruction::And:
1529 case Instruction::Or:
1530 case Instruction::Xor: {
1531 const MCExpr *LHS = LowerConstant(CE->getOperand(0), AP);
1532 const MCExpr *RHS = LowerConstant(CE->getOperand(1), AP);
1533 switch (CE->getOpcode()) {
1534 default: llvm_unreachable("Unknown binary operator constant cast expr");
1535 case Instruction::Add: return MCBinaryExpr::CreateAdd(LHS, RHS, Ctx);
1536 case Instruction::Sub: return MCBinaryExpr::CreateSub(LHS, RHS, Ctx);
1537 case Instruction::Mul: return MCBinaryExpr::CreateMul(LHS, RHS, Ctx);
1538 case Instruction::SDiv: return MCBinaryExpr::CreateDiv(LHS, RHS, Ctx);
1539 case Instruction::SRem: return MCBinaryExpr::CreateMod(LHS, RHS, Ctx);
1540 case Instruction::Shl: return MCBinaryExpr::CreateShl(LHS, RHS, Ctx);
1541 case Instruction::And: return MCBinaryExpr::CreateAnd(LHS, RHS, Ctx);
1542 case Instruction::Or: return MCBinaryExpr::CreateOr (LHS, RHS, Ctx);
1543 case Instruction::Xor: return MCBinaryExpr::CreateXor(LHS, RHS, Ctx);
1549 static void EmitGlobalConstantImpl(const Constant *C, unsigned AddrSpace,
1552 /// isRepeatedByteSequence - Determine whether the given value is
1553 /// composed of a repeated sequence of identical bytes and return the
1554 /// byte value. If it is not a repeated sequence, return -1.
1555 static int isRepeatedByteSequence(const ConstantDataSequential *V) {
1556 StringRef Data = V->getRawDataValues();
1557 assert(!Data.empty() && "Empty aggregates should be CAZ node");
1559 for (unsigned i = 1, e = Data.size(); i != e; ++i)
1560 if (Data[i] != C) return -1;
1561 return static_cast<uint8_t>(C); // Ensure 255 is not returned as -1.
1565 /// isRepeatedByteSequence - Determine whether the given value is
1566 /// composed of a repeated sequence of identical bytes and return the
1567 /// byte value. If it is not a repeated sequence, return -1.
1568 static int isRepeatedByteSequence(const Value *V, TargetMachine &TM) {
1570 if (const ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
1571 if (CI->getBitWidth() > 64) return -1;
1573 uint64_t Size = TM.getTargetData()->getTypeAllocSize(V->getType());
1574 uint64_t Value = CI->getZExtValue();
1576 // Make sure the constant is at least 8 bits long and has a power
1577 // of 2 bit width. This guarantees the constant bit width is
1578 // always a multiple of 8 bits, avoiding issues with padding out
1579 // to Size and other such corner cases.
1580 if (CI->getBitWidth() < 8 || !isPowerOf2_64(CI->getBitWidth())) return -1;
1582 uint8_t Byte = static_cast<uint8_t>(Value);
1584 for (unsigned i = 1; i < Size; ++i) {
1586 if (static_cast<uint8_t>(Value) != Byte) return -1;
1590 if (const ConstantArray *CA = dyn_cast<ConstantArray>(V)) {
1591 // Make sure all array elements are sequences of the same repeated
1593 assert(CA->getNumOperands() != 0 && "Should be a CAZ");
1594 int Byte = isRepeatedByteSequence(CA->getOperand(0), TM);
1595 if (Byte == -1) return -1;
1597 for (unsigned i = 1, e = CA->getNumOperands(); i != e; ++i) {
1598 int ThisByte = isRepeatedByteSequence(CA->getOperand(i), TM);
1599 if (ThisByte == -1) return -1;
1600 if (Byte != ThisByte) return -1;
1605 if (const ConstantDataSequential *CDS = dyn_cast<ConstantDataSequential>(V))
1606 return isRepeatedByteSequence(CDS);
1611 static void EmitGlobalConstantDataSequential(const ConstantDataSequential *CDS,
1612 unsigned AddrSpace,AsmPrinter &AP){
1614 // See if we can aggregate this into a .fill, if so, emit it as such.
1615 int Value = isRepeatedByteSequence(CDS, AP.TM);
1617 uint64_t Bytes = AP.TM.getTargetData()->getTypeAllocSize(CDS->getType());
1618 // Don't emit a 1-byte object as a .fill.
1620 return AP.OutStreamer.EmitFill(Bytes, Value, AddrSpace);
1623 // If this can be emitted with .ascii/.asciz, emit it as such.
1624 if (CDS->isString())
1625 return AP.OutStreamer.EmitBytes(CDS->getAsString(), AddrSpace);
1627 // Otherwise, emit the values in successive locations.
1628 unsigned ElementByteSize = CDS->getElementByteSize();
1629 if (isa<IntegerType>(CDS->getElementType())) {
1630 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) {
1632 AP.OutStreamer.GetCommentOS() << format("0x%" PRIx64 "\n",
1633 CDS->getElementAsInteger(i));
1634 AP.OutStreamer.EmitIntValue(CDS->getElementAsInteger(i),
1635 ElementByteSize, AddrSpace);
1637 } else if (ElementByteSize == 4) {
1638 // FP Constants are printed as integer constants to avoid losing
1640 assert(CDS->getElementType()->isFloatTy());
1641 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) {
1647 F = CDS->getElementAsFloat(i);
1649 AP.OutStreamer.GetCommentOS() << "float " << F << '\n';
1650 AP.OutStreamer.EmitIntValue(I, 4, AddrSpace);
1653 assert(CDS->getElementType()->isDoubleTy());
1654 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) {
1660 F = CDS->getElementAsDouble(i);
1662 AP.OutStreamer.GetCommentOS() << "double " << F << '\n';
1663 AP.OutStreamer.EmitIntValue(I, 8, AddrSpace);
1667 const TargetData &TD = *AP.TM.getTargetData();
1668 unsigned Size = TD.getTypeAllocSize(CDS->getType());
1669 unsigned EmittedSize = TD.getTypeAllocSize(CDS->getType()->getElementType()) *
1670 CDS->getNumElements();
1671 if (unsigned Padding = Size - EmittedSize)
1672 AP.OutStreamer.EmitZeros(Padding, AddrSpace);
1676 static void EmitGlobalConstantArray(const ConstantArray *CA, unsigned AddrSpace,
1678 if (AddrSpace != 0 || !CA->isString()) {
1679 // Not a string. Print the values in successive locations.
1681 // See if we can aggregate some values. Make sure it can be
1682 // represented as a series of bytes of the constant value.
1683 int Value = isRepeatedByteSequence(CA, AP.TM);
1686 uint64_t Bytes = AP.TM.getTargetData()->getTypeAllocSize(CA->getType());
1687 AP.OutStreamer.EmitFill(Bytes, Value, AddrSpace);
1690 for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i)
1691 EmitGlobalConstantImpl(CA->getOperand(i), AddrSpace, AP);
1696 // Otherwise, it can be emitted as .ascii.
1697 SmallVector<char, 128> TmpVec;
1698 TmpVec.reserve(CA->getNumOperands());
1699 for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i)
1700 TmpVec.push_back(cast<ConstantInt>(CA->getOperand(i))->getZExtValue());
1702 AP.OutStreamer.EmitBytes(StringRef(TmpVec.data(), TmpVec.size()), AddrSpace);
1705 static void EmitGlobalConstantVector(const ConstantVector *CV,
1706 unsigned AddrSpace, AsmPrinter &AP) {
1707 for (unsigned i = 0, e = CV->getType()->getNumElements(); i != e; ++i)
1708 EmitGlobalConstantImpl(CV->getOperand(i), AddrSpace, AP);
1710 const TargetData &TD = *AP.TM.getTargetData();
1711 unsigned Size = TD.getTypeAllocSize(CV->getType());
1712 unsigned EmittedSize = TD.getTypeAllocSize(CV->getType()->getElementType()) *
1713 CV->getType()->getNumElements();
1714 if (unsigned Padding = Size - EmittedSize)
1715 AP.OutStreamer.EmitZeros(Padding, AddrSpace);
1718 static void EmitGlobalConstantStruct(const ConstantStruct *CS,
1719 unsigned AddrSpace, AsmPrinter &AP) {
1720 // Print the fields in successive locations. Pad to align if needed!
1721 const TargetData *TD = AP.TM.getTargetData();
1722 unsigned Size = TD->getTypeAllocSize(CS->getType());
1723 const StructLayout *Layout = TD->getStructLayout(CS->getType());
1724 uint64_t SizeSoFar = 0;
1725 for (unsigned i = 0, e = CS->getNumOperands(); i != e; ++i) {
1726 const Constant *Field = CS->getOperand(i);
1728 // Check if padding is needed and insert one or more 0s.
1729 uint64_t FieldSize = TD->getTypeAllocSize(Field->getType());
1730 uint64_t PadSize = ((i == e-1 ? Size : Layout->getElementOffset(i+1))
1731 - Layout->getElementOffset(i)) - FieldSize;
1732 SizeSoFar += FieldSize + PadSize;
1734 // Now print the actual field value.
1735 EmitGlobalConstantImpl(Field, AddrSpace, AP);
1737 // Insert padding - this may include padding to increase the size of the
1738 // current field up to the ABI size (if the struct is not packed) as well
1739 // as padding to ensure that the next field starts at the right offset.
1740 AP.OutStreamer.EmitZeros(PadSize, AddrSpace);
1742 assert(SizeSoFar == Layout->getSizeInBytes() &&
1743 "Layout of constant struct may be incorrect!");
1746 static void EmitGlobalConstantFP(const ConstantFP *CFP, unsigned AddrSpace,
1748 if (CFP->getType()->isHalfTy()) {
1749 if (AP.isVerbose()) {
1750 SmallString<10> Str;
1751 CFP->getValueAPF().toString(Str);
1752 AP.OutStreamer.GetCommentOS() << "half " << Str << '\n';
1754 uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1755 AP.OutStreamer.EmitIntValue(Val, 2, AddrSpace);
1759 if (CFP->getType()->isFloatTy()) {
1760 if (AP.isVerbose()) {
1761 float Val = CFP->getValueAPF().convertToFloat();
1762 AP.OutStreamer.GetCommentOS() << "float " << Val << '\n';
1764 uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1765 AP.OutStreamer.EmitIntValue(Val, 4, AddrSpace);
1769 // FP Constants are printed as integer constants to avoid losing
1771 if (CFP->getType()->isDoubleTy()) {
1772 if (AP.isVerbose()) {
1773 double Val = CFP->getValueAPF().convertToDouble();
1774 AP.OutStreamer.GetCommentOS() << "double " << Val << '\n';
1777 uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1778 AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace);
1782 if (CFP->getType()->isX86_FP80Ty()) {
1783 // all long double variants are printed as hex
1784 // API needed to prevent premature destruction
1785 APInt API = CFP->getValueAPF().bitcastToAPInt();
1786 const uint64_t *p = API.getRawData();
1787 if (AP.isVerbose()) {
1788 // Convert to double so we can print the approximate val as a comment.
1789 APFloat DoubleVal = CFP->getValueAPF();
1791 DoubleVal.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven,
1793 AP.OutStreamer.GetCommentOS() << "x86_fp80 ~= "
1794 << DoubleVal.convertToDouble() << '\n';
1797 if (AP.TM.getTargetData()->isBigEndian()) {
1798 AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace);
1799 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1801 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1802 AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace);
1805 // Emit the tail padding for the long double.
1806 const TargetData &TD = *AP.TM.getTargetData();
1807 AP.OutStreamer.EmitZeros(TD.getTypeAllocSize(CFP->getType()) -
1808 TD.getTypeStoreSize(CFP->getType()), AddrSpace);
1812 assert(CFP->getType()->isPPC_FP128Ty() &&
1813 "Floating point constant type not handled");
1814 // All long double variants are printed as hex
1815 // API needed to prevent premature destruction.
1816 APInt API = CFP->getValueAPF().bitcastToAPInt();
1817 const uint64_t *p = API.getRawData();
1818 if (AP.TM.getTargetData()->isBigEndian()) {
1819 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1820 AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace);
1822 AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace);
1823 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1827 static void EmitGlobalConstantLargeInt(const ConstantInt *CI,
1828 unsigned AddrSpace, AsmPrinter &AP) {
1829 const TargetData *TD = AP.TM.getTargetData();
1830 unsigned BitWidth = CI->getBitWidth();
1831 assert((BitWidth & 63) == 0 && "only support multiples of 64-bits");
1833 // We don't expect assemblers to support integer data directives
1834 // for more than 64 bits, so we emit the data in at most 64-bit
1835 // quantities at a time.
1836 const uint64_t *RawData = CI->getValue().getRawData();
1837 for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) {
1838 uint64_t Val = TD->isBigEndian() ? RawData[e - i - 1] : RawData[i];
1839 AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace);
1843 static void EmitGlobalConstantImpl(const Constant *CV, unsigned AddrSpace,
1845 if (isa<ConstantAggregateZero>(CV) || isa<UndefValue>(CV)) {
1846 uint64_t Size = AP.TM.getTargetData()->getTypeAllocSize(CV->getType());
1847 return AP.OutStreamer.EmitZeros(Size, AddrSpace);
1850 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
1851 unsigned Size = AP.TM.getTargetData()->getTypeAllocSize(CV->getType());
1858 AP.OutStreamer.GetCommentOS() << format("0x%" PRIx64 "\n",
1859 CI->getZExtValue());
1860 AP.OutStreamer.EmitIntValue(CI->getZExtValue(), Size, AddrSpace);
1863 EmitGlobalConstantLargeInt(CI, AddrSpace, AP);
1868 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV))
1869 return EmitGlobalConstantFP(CFP, AddrSpace, AP);
1871 if (isa<ConstantPointerNull>(CV)) {
1872 unsigned Size = AP.TM.getTargetData()->getTypeAllocSize(CV->getType());
1873 AP.OutStreamer.EmitIntValue(0, Size, AddrSpace);
1877 if (const ConstantDataSequential *CDS = dyn_cast<ConstantDataSequential>(CV))
1878 return EmitGlobalConstantDataSequential(CDS, AddrSpace, AP);
1880 if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV))
1881 return EmitGlobalConstantArray(CVA, AddrSpace, AP);
1883 if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV))
1884 return EmitGlobalConstantStruct(CVS, AddrSpace, AP);
1886 // Look through bitcasts, which might not be able to be MCExpr'ized (e.g. of
1888 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV))
1889 if (CE->getOpcode() == Instruction::BitCast)
1890 return EmitGlobalConstantImpl(CE->getOperand(0), AddrSpace, AP);
1892 if (const ConstantVector *V = dyn_cast<ConstantVector>(CV))
1893 return EmitGlobalConstantVector(V, AddrSpace, AP);
1895 // Otherwise, it must be a ConstantExpr. Lower it to an MCExpr, then emit it
1896 // thread the streamer with EmitValue.
1897 AP.OutStreamer.EmitValue(LowerConstant(CV, AP),
1898 AP.TM.getTargetData()->getTypeAllocSize(CV->getType()),
1902 /// EmitGlobalConstant - Print a general LLVM constant to the .s file.
1903 void AsmPrinter::EmitGlobalConstant(const Constant *CV, unsigned AddrSpace) {
1904 uint64_t Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
1906 EmitGlobalConstantImpl(CV, AddrSpace, *this);
1907 else if (MAI->hasSubsectionsViaSymbols()) {
1908 // If the global has zero size, emit a single byte so that two labels don't
1909 // look like they are at the same location.
1910 OutStreamer.EmitIntValue(0, 1, AddrSpace);
1914 void AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
1915 // Target doesn't support this yet!
1916 llvm_unreachable("Target does not support EmitMachineConstantPoolValue");
1919 void AsmPrinter::printOffset(int64_t Offset, raw_ostream &OS) const {
1921 OS << '+' << Offset;
1922 else if (Offset < 0)
1926 //===----------------------------------------------------------------------===//
1927 // Symbol Lowering Routines.
1928 //===----------------------------------------------------------------------===//
1930 /// GetTempSymbol - Return the MCSymbol corresponding to the assembler
1931 /// temporary label with the specified stem and unique ID.
1932 MCSymbol *AsmPrinter::GetTempSymbol(StringRef Name, unsigned ID) const {
1933 return OutContext.GetOrCreateSymbol(Twine(MAI->getPrivateGlobalPrefix()) +
1937 /// GetTempSymbol - Return an assembler temporary label with the specified
1939 MCSymbol *AsmPrinter::GetTempSymbol(StringRef Name) const {
1940 return OutContext.GetOrCreateSymbol(Twine(MAI->getPrivateGlobalPrefix())+
1945 MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BlockAddress *BA) const {
1946 return MMI->getAddrLabelSymbol(BA->getBasicBlock());
1949 MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BasicBlock *BB) const {
1950 return MMI->getAddrLabelSymbol(BB);
1953 /// GetCPISymbol - Return the symbol for the specified constant pool entry.
1954 MCSymbol *AsmPrinter::GetCPISymbol(unsigned CPID) const {
1955 return OutContext.GetOrCreateSymbol
1956 (Twine(MAI->getPrivateGlobalPrefix()) + "CPI" + Twine(getFunctionNumber())
1957 + "_" + Twine(CPID));
1960 /// GetJTISymbol - Return the symbol for the specified jump table entry.
1961 MCSymbol *AsmPrinter::GetJTISymbol(unsigned JTID, bool isLinkerPrivate) const {
1962 return MF->getJTISymbol(JTID, OutContext, isLinkerPrivate);
1965 /// GetJTSetSymbol - Return the symbol for the specified jump table .set
1966 /// FIXME: privatize to AsmPrinter.
1967 MCSymbol *AsmPrinter::GetJTSetSymbol(unsigned UID, unsigned MBBID) const {
1968 return OutContext.GetOrCreateSymbol
1969 (Twine(MAI->getPrivateGlobalPrefix()) + Twine(getFunctionNumber()) + "_" +
1970 Twine(UID) + "_set_" + Twine(MBBID));
1973 /// GetSymbolWithGlobalValueBase - Return the MCSymbol for a symbol with
1974 /// global value name as its base, with the specified suffix, and where the
1975 /// symbol is forced to have private linkage if ForcePrivate is true.
1976 MCSymbol *AsmPrinter::GetSymbolWithGlobalValueBase(const GlobalValue *GV,
1978 bool ForcePrivate) const {
1979 SmallString<60> NameStr;
1980 Mang->getNameWithPrefix(NameStr, GV, ForcePrivate);
1981 NameStr.append(Suffix.begin(), Suffix.end());
1982 return OutContext.GetOrCreateSymbol(NameStr.str());
1985 /// GetExternalSymbolSymbol - Return the MCSymbol for the specified
1987 MCSymbol *AsmPrinter::GetExternalSymbolSymbol(StringRef Sym) const {
1988 SmallString<60> NameStr;
1989 Mang->getNameWithPrefix(NameStr, Sym);
1990 return OutContext.GetOrCreateSymbol(NameStr.str());
1995 /// PrintParentLoopComment - Print comments about parent loops of this one.
1996 static void PrintParentLoopComment(raw_ostream &OS, const MachineLoop *Loop,
1997 unsigned FunctionNumber) {
1998 if (Loop == 0) return;
1999 PrintParentLoopComment(OS, Loop->getParentLoop(), FunctionNumber);
2000 OS.indent(Loop->getLoopDepth()*2)
2001 << "Parent Loop BB" << FunctionNumber << "_"
2002 << Loop->getHeader()->getNumber()
2003 << " Depth=" << Loop->getLoopDepth() << '\n';
2007 /// PrintChildLoopComment - Print comments about child loops within
2008 /// the loop for this basic block, with nesting.
2009 static void PrintChildLoopComment(raw_ostream &OS, const MachineLoop *Loop,
2010 unsigned FunctionNumber) {
2011 // Add child loop information
2012 for (MachineLoop::iterator CL = Loop->begin(), E = Loop->end();CL != E; ++CL){
2013 OS.indent((*CL)->getLoopDepth()*2)
2014 << "Child Loop BB" << FunctionNumber << "_"
2015 << (*CL)->getHeader()->getNumber() << " Depth " << (*CL)->getLoopDepth()
2017 PrintChildLoopComment(OS, *CL, FunctionNumber);
2021 /// EmitBasicBlockLoopComments - Pretty-print comments for basic blocks.
2022 static void EmitBasicBlockLoopComments(const MachineBasicBlock &MBB,
2023 const MachineLoopInfo *LI,
2024 const AsmPrinter &AP) {
2025 // Add loop depth information
2026 const MachineLoop *Loop = LI->getLoopFor(&MBB);
2027 if (Loop == 0) return;
2029 MachineBasicBlock *Header = Loop->getHeader();
2030 assert(Header && "No header for loop");
2032 // If this block is not a loop header, just print out what is the loop header
2034 if (Header != &MBB) {
2035 AP.OutStreamer.AddComment(" in Loop: Header=BB" +
2036 Twine(AP.getFunctionNumber())+"_" +
2037 Twine(Loop->getHeader()->getNumber())+
2038 " Depth="+Twine(Loop->getLoopDepth()));
2042 // Otherwise, it is a loop header. Print out information about child and
2044 raw_ostream &OS = AP.OutStreamer.GetCommentOS();
2046 PrintParentLoopComment(OS, Loop->getParentLoop(), AP.getFunctionNumber());
2049 OS.indent(Loop->getLoopDepth()*2-2);
2054 OS << "Loop Header: Depth=" + Twine(Loop->getLoopDepth()) << '\n';
2056 PrintChildLoopComment(OS, Loop, AP.getFunctionNumber());
2060 /// EmitBasicBlockStart - This method prints the label for the specified
2061 /// MachineBasicBlock, an alignment (if present) and a comment describing
2062 /// it if appropriate.
2063 void AsmPrinter::EmitBasicBlockStart(const MachineBasicBlock *MBB) const {
2064 // Emit an alignment directive for this block, if needed.
2065 if (unsigned Align = MBB->getAlignment())
2066 EmitAlignment(Align);
2068 // If the block has its address taken, emit any labels that were used to
2069 // reference the block. It is possible that there is more than one label
2070 // here, because multiple LLVM BB's may have been RAUW'd to this block after
2071 // the references were generated.
2072 if (MBB->hasAddressTaken()) {
2073 const BasicBlock *BB = MBB->getBasicBlock();
2075 OutStreamer.AddComment("Block address taken");
2077 std::vector<MCSymbol*> Syms = MMI->getAddrLabelSymbolToEmit(BB);
2079 for (unsigned i = 0, e = Syms.size(); i != e; ++i)
2080 OutStreamer.EmitLabel(Syms[i]);
2083 // Print the main label for the block.
2084 if (MBB->pred_empty() || isBlockOnlyReachableByFallthrough(MBB)) {
2085 if (isVerbose() && OutStreamer.hasRawTextSupport()) {
2086 if (const BasicBlock *BB = MBB->getBasicBlock())
2088 OutStreamer.AddComment("%" + BB->getName());
2090 EmitBasicBlockLoopComments(*MBB, LI, *this);
2092 // NOTE: Want this comment at start of line, don't emit with AddComment.
2093 OutStreamer.EmitRawText(Twine(MAI->getCommentString()) + " BB#" +
2094 Twine(MBB->getNumber()) + ":");
2098 if (const BasicBlock *BB = MBB->getBasicBlock())
2100 OutStreamer.AddComment("%" + BB->getName());
2101 EmitBasicBlockLoopComments(*MBB, LI, *this);
2104 OutStreamer.EmitLabel(MBB->getSymbol());
2108 void AsmPrinter::EmitVisibility(MCSymbol *Sym, unsigned Visibility,
2109 bool IsDefinition) const {
2110 MCSymbolAttr Attr = MCSA_Invalid;
2112 switch (Visibility) {
2114 case GlobalValue::HiddenVisibility:
2116 Attr = MAI->getHiddenVisibilityAttr();
2118 Attr = MAI->getHiddenDeclarationVisibilityAttr();
2120 case GlobalValue::ProtectedVisibility:
2121 Attr = MAI->getProtectedVisibilityAttr();
2125 if (Attr != MCSA_Invalid)
2126 OutStreamer.EmitSymbolAttribute(Sym, Attr);
2129 /// isBlockOnlyReachableByFallthough - Return true if the basic block has
2130 /// exactly one predecessor and the control transfer mechanism between
2131 /// the predecessor and this block is a fall-through.
2133 isBlockOnlyReachableByFallthrough(const MachineBasicBlock *MBB) const {
2134 // If this is a landing pad, it isn't a fall through. If it has no preds,
2135 // then nothing falls through to it.
2136 if (MBB->isLandingPad() || MBB->pred_empty())
2139 // If there isn't exactly one predecessor, it can't be a fall through.
2140 MachineBasicBlock::const_pred_iterator PI = MBB->pred_begin(), PI2 = PI;
2142 if (PI2 != MBB->pred_end())
2145 // The predecessor has to be immediately before this block.
2146 MachineBasicBlock *Pred = *PI;
2148 if (!Pred->isLayoutSuccessor(MBB))
2151 // If the block is completely empty, then it definitely does fall through.
2155 // Check the terminators in the previous blocks
2156 for (MachineBasicBlock::iterator II = Pred->getFirstTerminator(),
2157 IE = Pred->end(); II != IE; ++II) {
2158 MachineInstr &MI = *II;
2160 // If it is not a simple branch, we are in a table somewhere.
2161 if (!MI.isBranch() || MI.isIndirectBranch())
2164 // If we are the operands of one of the branches, this is not
2166 for (MachineInstr::mop_iterator OI = MI.operands_begin(),
2167 OE = MI.operands_end(); OI != OE; ++OI) {
2168 const MachineOperand& OP = *OI;
2171 if (OP.isMBB() && OP.getMBB() == MBB)
2181 GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy *S) {
2182 if (!S->usesMetadata())
2185 gcp_map_type &GCMap = getGCMap(GCMetadataPrinters);
2186 gcp_map_type::iterator GCPI = GCMap.find(S);
2187 if (GCPI != GCMap.end())
2188 return GCPI->second;
2190 const char *Name = S->getName().c_str();
2192 for (GCMetadataPrinterRegistry::iterator
2193 I = GCMetadataPrinterRegistry::begin(),
2194 E = GCMetadataPrinterRegistry::end(); I != E; ++I)
2195 if (strcmp(Name, I->getName()) == 0) {
2196 GCMetadataPrinter *GMP = I->instantiate();
2198 GCMap.insert(std::make_pair(S, GMP));
2202 report_fatal_error("no GCMetadataPrinter registered for GC: " + Twine(Name));