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 CurrentFnSym = CurrentFnSymForSize = 0;
104 GCMetadataPrinters = 0;
105 VerboseAsm = Streamer.isVerboseAsm();
108 AsmPrinter::~AsmPrinter() {
109 assert(DD == 0 && DE == 0 && "Debug/EH info didn't get finalized");
111 if (GCMetadataPrinters != 0) {
112 gcp_map_type &GCMap = getGCMap(GCMetadataPrinters);
114 for (gcp_map_type::iterator I = GCMap.begin(), E = GCMap.end(); I != E; ++I)
117 GCMetadataPrinters = 0;
123 /// getFunctionNumber - Return a unique ID for the current function.
125 unsigned AsmPrinter::getFunctionNumber() const {
126 return MF->getFunctionNumber();
129 const TargetLoweringObjectFile &AsmPrinter::getObjFileLowering() const {
130 return TM.getTargetLowering()->getObjFileLowering();
134 /// getTargetData - Return information about data layout.
135 const TargetData &AsmPrinter::getTargetData() const {
136 return *TM.getTargetData();
139 /// getCurrentSection() - Return the current section we are emitting to.
140 const MCSection *AsmPrinter::getCurrentSection() const {
141 return OutStreamer.getCurrentSection();
146 void AsmPrinter::getAnalysisUsage(AnalysisUsage &AU) const {
147 AU.setPreservesAll();
148 MachineFunctionPass::getAnalysisUsage(AU);
149 AU.addRequired<MachineModuleInfo>();
150 AU.addRequired<GCModuleInfo>();
152 AU.addRequired<MachineLoopInfo>();
155 bool AsmPrinter::doInitialization(Module &M) {
156 MMI = getAnalysisIfAvailable<MachineModuleInfo>();
157 MMI->AnalyzeModule(M);
159 // Initialize TargetLoweringObjectFile.
160 const_cast<TargetLoweringObjectFile&>(getObjFileLowering())
161 .Initialize(OutContext, TM);
163 Mang = new Mangler(OutContext, *TM.getTargetData());
165 // Allow the target to emit any magic that it wants at the start of the file.
166 EmitStartOfAsmFile(M);
168 // Very minimal debug info. It is ignored if we emit actual debug info. If we
169 // don't, this at least helps the user find where a global came from.
170 if (MAI->hasSingleParameterDotFile()) {
172 OutStreamer.EmitFileDirective(M.getModuleIdentifier());
175 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
176 assert(MI && "AsmPrinter didn't require GCModuleInfo?");
177 for (GCModuleInfo::iterator I = MI->begin(), E = MI->end(); I != E; ++I)
178 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I))
179 MP->beginAssembly(*this);
181 // Emit module-level inline asm if it exists.
182 if (!M.getModuleInlineAsm().empty()) {
183 OutStreamer.AddComment("Start of file scope inline assembly");
184 OutStreamer.AddBlankLine();
185 EmitInlineAsm(M.getModuleInlineAsm()+"\n");
186 OutStreamer.AddComment("End of file scope inline assembly");
187 OutStreamer.AddBlankLine();
190 if (MAI->doesSupportDebugInformation())
191 DD = new DwarfDebug(this, &M);
193 switch (MAI->getExceptionHandlingType()) {
194 case ExceptionHandling::None:
196 case ExceptionHandling::SjLj:
197 case ExceptionHandling::DwarfCFI:
198 DE = new DwarfCFIException(this);
200 case ExceptionHandling::ARM:
201 DE = new ARMException(this);
203 case ExceptionHandling::Win64:
204 DE = new Win64Exception(this);
208 llvm_unreachable("Unknown exception type.");
211 void AsmPrinter::EmitLinkage(unsigned Linkage, MCSymbol *GVSym) const {
212 switch ((GlobalValue::LinkageTypes)Linkage) {
213 case GlobalValue::CommonLinkage:
214 case GlobalValue::LinkOnceAnyLinkage:
215 case GlobalValue::LinkOnceODRLinkage:
216 case GlobalValue::WeakAnyLinkage:
217 case GlobalValue::WeakODRLinkage:
218 case GlobalValue::LinkerPrivateWeakLinkage:
219 case GlobalValue::LinkerPrivateWeakDefAutoLinkage:
220 if (MAI->getWeakDefDirective() != 0) {
222 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
224 if ((GlobalValue::LinkageTypes)Linkage !=
225 GlobalValue::LinkerPrivateWeakDefAutoLinkage)
226 // .weak_definition _foo
227 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_WeakDefinition);
229 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_WeakDefAutoPrivate);
230 } else if (MAI->getLinkOnceDirective() != 0) {
232 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
233 //NOTE: linkonce is handled by the section the symbol was assigned to.
236 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Weak);
239 case GlobalValue::DLLExportLinkage:
240 case GlobalValue::AppendingLinkage:
241 // FIXME: appending linkage variables should go into a section of
242 // their name or something. For now, just emit them as external.
243 case GlobalValue::ExternalLinkage:
244 // If external or appending, declare as a global symbol.
246 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
248 case GlobalValue::PrivateLinkage:
249 case GlobalValue::InternalLinkage:
250 case GlobalValue::LinkerPrivateLinkage:
253 llvm_unreachable("Unknown linkage type!");
258 /// EmitGlobalVariable - Emit the specified global variable to the .s file.
259 void AsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) {
260 if (GV->hasInitializer()) {
261 // Check to see if this is a special global used by LLVM, if so, emit it.
262 if (EmitSpecialLLVMGlobal(GV))
266 WriteAsOperand(OutStreamer.GetCommentOS(), GV,
267 /*PrintType=*/false, GV->getParent());
268 OutStreamer.GetCommentOS() << '\n';
272 MCSymbol *GVSym = Mang->getSymbol(GV);
273 EmitVisibility(GVSym, GV->getVisibility(), !GV->isDeclaration());
275 if (!GV->hasInitializer()) // External globals require no extra code.
278 if (MAI->hasDotTypeDotSizeDirective())
279 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_ELF_TypeObject);
281 SectionKind GVKind = TargetLoweringObjectFile::getKindForGlobal(GV, TM);
283 const TargetData *TD = TM.getTargetData();
284 uint64_t Size = TD->getTypeAllocSize(GV->getType()->getElementType());
286 // If the alignment is specified, we *must* obey it. Overaligning a global
287 // with a specified alignment is a prompt way to break globals emitted to
288 // sections and expected to be contiguous (e.g. ObjC metadata).
289 unsigned AlignLog = getGVAlignmentLog2(GV, *TD);
291 // Handle common and BSS local symbols (.lcomm).
292 if (GVKind.isCommon() || GVKind.isBSSLocal()) {
293 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
294 unsigned Align = 1 << AlignLog;
296 // Handle common symbols.
297 if (GVKind.isCommon()) {
298 if (!getObjFileLowering().getCommDirectiveSupportsAlignment())
302 OutStreamer.EmitCommonSymbol(GVSym, Size, Align);
306 // Handle local BSS symbols.
307 if (MAI->hasMachoZeroFillDirective()) {
308 const MCSection *TheSection =
309 getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM);
310 // .zerofill __DATA, __bss, _foo, 400, 5
311 OutStreamer.EmitZerofill(TheSection, GVSym, Size, Align);
315 if (MAI->getLCOMMDirectiveType() != LCOMM::None &&
316 (MAI->getLCOMMDirectiveType() != LCOMM::NoAlignment || Align == 1)) {
318 OutStreamer.EmitLocalCommonSymbol(GVSym, Size, Align);
322 if (!getObjFileLowering().getCommDirectiveSupportsAlignment())
326 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Local);
328 OutStreamer.EmitCommonSymbol(GVSym, Size, Align);
332 const MCSection *TheSection =
333 getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM);
335 // Handle the zerofill directive on darwin, which is a special form of BSS
337 if (GVKind.isBSSExtern() && MAI->hasMachoZeroFillDirective()) {
338 if (Size == 0) Size = 1; // zerofill of 0 bytes is undefined.
341 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
342 // .zerofill __DATA, __common, _foo, 400, 5
343 OutStreamer.EmitZerofill(TheSection, GVSym, Size, 1 << AlignLog);
347 // Handle thread local data for mach-o which requires us to output an
348 // additional structure of data and mangle the original symbol so that we
349 // can reference it later.
351 // TODO: This should become an "emit thread local global" method on TLOF.
352 // All of this macho specific stuff should be sunk down into TLOFMachO and
353 // stuff like "TLSExtraDataSection" should no longer be part of the parent
354 // TLOF class. This will also make it more obvious that stuff like
355 // MCStreamer::EmitTBSSSymbol is macho specific and only called from macho
357 if (GVKind.isThreadLocal() && MAI->hasMachoTBSSDirective()) {
358 // Emit the .tbss symbol
360 OutContext.GetOrCreateSymbol(GVSym->getName() + Twine("$tlv$init"));
362 if (GVKind.isThreadBSS())
363 OutStreamer.EmitTBSSSymbol(TheSection, MangSym, Size, 1 << AlignLog);
364 else if (GVKind.isThreadData()) {
365 OutStreamer.SwitchSection(TheSection);
367 EmitAlignment(AlignLog, GV);
368 OutStreamer.EmitLabel(MangSym);
370 EmitGlobalConstant(GV->getInitializer());
373 OutStreamer.AddBlankLine();
375 // Emit the variable struct for the runtime.
376 const MCSection *TLVSect
377 = getObjFileLowering().getTLSExtraDataSection();
379 OutStreamer.SwitchSection(TLVSect);
380 // Emit the linkage here.
381 EmitLinkage(GV->getLinkage(), GVSym);
382 OutStreamer.EmitLabel(GVSym);
384 // Three pointers in size:
385 // - __tlv_bootstrap - used to make sure support exists
386 // - spare pointer, used when mapped by the runtime
387 // - pointer to mangled symbol above with initializer
388 unsigned PtrSize = TD->getPointerSizeInBits()/8;
389 OutStreamer.EmitSymbolValue(GetExternalSymbolSymbol("_tlv_bootstrap"),
391 OutStreamer.EmitIntValue(0, PtrSize, 0);
392 OutStreamer.EmitSymbolValue(MangSym, PtrSize, 0);
394 OutStreamer.AddBlankLine();
398 OutStreamer.SwitchSection(TheSection);
400 EmitLinkage(GV->getLinkage(), GVSym);
401 EmitAlignment(AlignLog, GV);
403 OutStreamer.EmitLabel(GVSym);
405 EmitGlobalConstant(GV->getInitializer());
407 if (MAI->hasDotTypeDotSizeDirective())
409 OutStreamer.EmitELFSize(GVSym, MCConstantExpr::Create(Size, OutContext));
411 OutStreamer.AddBlankLine();
414 /// EmitFunctionHeader - This method emits the header for the current
416 void AsmPrinter::EmitFunctionHeader() {
417 // Print out constants referenced by the function
420 // Print the 'header' of function.
421 const Function *F = MF->getFunction();
423 OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang, TM));
424 EmitVisibility(CurrentFnSym, F->getVisibility());
426 EmitLinkage(F->getLinkage(), CurrentFnSym);
427 EmitAlignment(MF->getAlignment(), F);
429 if (MAI->hasDotTypeDotSizeDirective())
430 OutStreamer.EmitSymbolAttribute(CurrentFnSym, MCSA_ELF_TypeFunction);
433 WriteAsOperand(OutStreamer.GetCommentOS(), F,
434 /*PrintType=*/false, F->getParent());
435 OutStreamer.GetCommentOS() << '\n';
438 // Emit the CurrentFnSym. This is a virtual function to allow targets to
439 // do their wild and crazy things as required.
440 EmitFunctionEntryLabel();
442 // If the function had address-taken blocks that got deleted, then we have
443 // references to the dangling symbols. Emit them at the start of the function
444 // so that we don't get references to undefined symbols.
445 std::vector<MCSymbol*> DeadBlockSyms;
446 MMI->takeDeletedSymbolsForFunction(F, DeadBlockSyms);
447 for (unsigned i = 0, e = DeadBlockSyms.size(); i != e; ++i) {
448 OutStreamer.AddComment("Address taken block that was later removed");
449 OutStreamer.EmitLabel(DeadBlockSyms[i]);
452 // Add some workaround for linkonce linkage on Cygwin\MinGW.
453 if (MAI->getLinkOnceDirective() != 0 &&
454 (F->hasLinkOnceLinkage() || F->hasWeakLinkage())) {
455 // FIXME: What is this?
457 OutContext.GetOrCreateSymbol(Twine("Lllvm$workaround$fake$stub$")+
458 CurrentFnSym->getName());
459 OutStreamer.EmitLabel(FakeStub);
462 // Emit pre-function debug and/or EH information.
464 NamedRegionTimer T(EHTimerName, DWARFGroupName, TimePassesIsEnabled);
465 DE->BeginFunction(MF);
468 NamedRegionTimer T(DbgTimerName, DWARFGroupName, TimePassesIsEnabled);
469 DD->beginFunction(MF);
473 /// EmitFunctionEntryLabel - Emit the label that is the entrypoint for the
474 /// function. This can be overridden by targets as required to do custom stuff.
475 void AsmPrinter::EmitFunctionEntryLabel() {
476 // The function label could have already been emitted if two symbols end up
477 // conflicting due to asm renaming. Detect this and emit an error.
478 if (CurrentFnSym->isUndefined()) {
479 OutStreamer.ForceCodeRegion();
480 return OutStreamer.EmitLabel(CurrentFnSym);
483 report_fatal_error("'" + Twine(CurrentFnSym->getName()) +
484 "' label emitted multiple times to assembly file");
488 /// EmitComments - Pretty-print comments for instructions.
489 static void EmitComments(const MachineInstr &MI, raw_ostream &CommentOS) {
490 const MachineFunction *MF = MI.getParent()->getParent();
491 const TargetMachine &TM = MF->getTarget();
493 // Check for spills and reloads
496 const MachineFrameInfo *FrameInfo = MF->getFrameInfo();
498 // We assume a single instruction only has a spill or reload, not
500 const MachineMemOperand *MMO;
501 if (TM.getInstrInfo()->isLoadFromStackSlotPostFE(&MI, FI)) {
502 if (FrameInfo->isSpillSlotObjectIndex(FI)) {
503 MMO = *MI.memoperands_begin();
504 CommentOS << MMO->getSize() << "-byte Reload\n";
506 } else if (TM.getInstrInfo()->hasLoadFromStackSlot(&MI, MMO, FI)) {
507 if (FrameInfo->isSpillSlotObjectIndex(FI))
508 CommentOS << MMO->getSize() << "-byte Folded Reload\n";
509 } else if (TM.getInstrInfo()->isStoreToStackSlotPostFE(&MI, FI)) {
510 if (FrameInfo->isSpillSlotObjectIndex(FI)) {
511 MMO = *MI.memoperands_begin();
512 CommentOS << MMO->getSize() << "-byte Spill\n";
514 } else if (TM.getInstrInfo()->hasStoreToStackSlot(&MI, MMO, FI)) {
515 if (FrameInfo->isSpillSlotObjectIndex(FI))
516 CommentOS << MMO->getSize() << "-byte Folded Spill\n";
519 // Check for spill-induced copies
520 if (MI.getAsmPrinterFlag(MachineInstr::ReloadReuse))
521 CommentOS << " Reload Reuse\n";
524 /// EmitImplicitDef - This method emits the specified machine instruction
525 /// that is an implicit def.
526 static void EmitImplicitDef(const MachineInstr *MI, AsmPrinter &AP) {
527 unsigned RegNo = MI->getOperand(0).getReg();
528 AP.OutStreamer.AddComment(Twine("implicit-def: ") +
529 AP.TM.getRegisterInfo()->getName(RegNo));
530 AP.OutStreamer.AddBlankLine();
533 static void EmitKill(const MachineInstr *MI, AsmPrinter &AP) {
534 std::string Str = "kill:";
535 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
536 const MachineOperand &Op = MI->getOperand(i);
537 assert(Op.isReg() && "KILL instruction must have only register operands");
539 Str += AP.TM.getRegisterInfo()->getName(Op.getReg());
540 Str += (Op.isDef() ? "<def>" : "<kill>");
542 AP.OutStreamer.AddComment(Str);
543 AP.OutStreamer.AddBlankLine();
546 /// EmitDebugValueComment - This method handles the target-independent form
547 /// of DBG_VALUE, returning true if it was able to do so. A false return
548 /// means the target will need to handle MI in EmitInstruction.
549 static bool EmitDebugValueComment(const MachineInstr *MI, AsmPrinter &AP) {
550 // This code handles only the 3-operand target-independent form.
551 if (MI->getNumOperands() != 3)
554 SmallString<128> Str;
555 raw_svector_ostream OS(Str);
556 OS << '\t' << AP.MAI->getCommentString() << "DEBUG_VALUE: ";
558 // cast away const; DIetc do not take const operands for some reason.
559 DIVariable V(const_cast<MDNode*>(MI->getOperand(2).getMetadata()));
560 if (V.getContext().isSubprogram())
561 OS << DISubprogram(V.getContext()).getDisplayName() << ":";
562 OS << V.getName() << " <- ";
564 // Register or immediate value. Register 0 means undef.
565 if (MI->getOperand(0).isFPImm()) {
566 APFloat APF = APFloat(MI->getOperand(0).getFPImm()->getValueAPF());
567 if (MI->getOperand(0).getFPImm()->getType()->isFloatTy()) {
568 OS << (double)APF.convertToFloat();
569 } else if (MI->getOperand(0).getFPImm()->getType()->isDoubleTy()) {
570 OS << APF.convertToDouble();
572 // There is no good way to print long double. Convert a copy to
573 // double. Ah well, it's only a comment.
575 APF.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven,
577 OS << "(long double) " << APF.convertToDouble();
579 } else if (MI->getOperand(0).isImm()) {
580 OS << MI->getOperand(0).getImm();
581 } else if (MI->getOperand(0).isCImm()) {
582 MI->getOperand(0).getCImm()->getValue().print(OS, false /*isSigned*/);
584 assert(MI->getOperand(0).isReg() && "Unknown operand type");
585 if (MI->getOperand(0).getReg() == 0) {
586 // Suppress offset, it is not meaningful here.
588 // NOTE: Want this comment at start of line, don't emit with AddComment.
589 AP.OutStreamer.EmitRawText(OS.str());
592 OS << AP.TM.getRegisterInfo()->getName(MI->getOperand(0).getReg());
595 OS << '+' << MI->getOperand(1).getImm();
596 // NOTE: Want this comment at start of line, don't emit with AddComment.
597 AP.OutStreamer.EmitRawText(OS.str());
601 AsmPrinter::CFIMoveType AsmPrinter::needsCFIMoves() {
602 if (MAI->getExceptionHandlingType() == ExceptionHandling::DwarfCFI &&
603 MF->getFunction()->needsUnwindTableEntry())
606 if (MMI->hasDebugInfo())
612 bool AsmPrinter::needsSEHMoves() {
613 return MAI->getExceptionHandlingType() == ExceptionHandling::Win64 &&
614 MF->getFunction()->needsUnwindTableEntry();
617 bool AsmPrinter::needsRelocationsForDwarfStringPool() const {
618 return MAI->doesDwarfUseRelocationsForStringPool();
621 void AsmPrinter::emitPrologLabel(const MachineInstr &MI) {
622 MCSymbol *Label = MI.getOperand(0).getMCSymbol();
624 if (MAI->getExceptionHandlingType() != ExceptionHandling::DwarfCFI)
627 if (needsCFIMoves() == CFI_M_None)
630 if (MMI->getCompactUnwindEncoding() != 0)
631 OutStreamer.EmitCompactUnwindEncoding(MMI->getCompactUnwindEncoding());
633 MachineModuleInfo &MMI = MF->getMMI();
634 std::vector<MachineMove> &Moves = MMI.getFrameMoves();
635 bool FoundOne = false;
637 for (std::vector<MachineMove>::iterator I = Moves.begin(),
638 E = Moves.end(); I != E; ++I) {
639 if (I->getLabel() == Label) {
640 EmitCFIFrameMove(*I);
647 /// EmitFunctionBody - This method emits the body and trailer for a
649 void AsmPrinter::EmitFunctionBody() {
650 // Emit target-specific gunk before the function body.
651 EmitFunctionBodyStart();
653 bool ShouldPrintDebugScopes = DD && MMI->hasDebugInfo();
655 // Print out code for the function.
656 bool HasAnyRealCode = false;
657 const MachineInstr *LastMI = 0;
658 for (MachineFunction::const_iterator I = MF->begin(), E = MF->end();
660 // Print a label for the basic block.
661 EmitBasicBlockStart(I);
662 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
666 // Print the assembly for the instruction.
667 if (!II->isLabel() && !II->isImplicitDef() && !II->isKill() &&
668 !II->isDebugValue()) {
669 HasAnyRealCode = true;
673 if (ShouldPrintDebugScopes) {
674 NamedRegionTimer T(DbgTimerName, DWARFGroupName, TimePassesIsEnabled);
675 DD->beginInstruction(II);
679 EmitComments(*II, OutStreamer.GetCommentOS());
681 switch (II->getOpcode()) {
682 case TargetOpcode::PROLOG_LABEL:
683 emitPrologLabel(*II);
686 case TargetOpcode::EH_LABEL:
687 case TargetOpcode::GC_LABEL:
688 OutStreamer.EmitLabel(II->getOperand(0).getMCSymbol());
690 case TargetOpcode::INLINEASM:
693 case TargetOpcode::DBG_VALUE:
695 if (!EmitDebugValueComment(II, *this))
699 case TargetOpcode::IMPLICIT_DEF:
700 if (isVerbose()) EmitImplicitDef(II, *this);
702 case TargetOpcode::KILL:
703 if (isVerbose()) EmitKill(II, *this);
706 if (!TM.hasMCUseLoc())
707 MCLineEntry::Make(&OutStreamer, getCurrentSection());
713 if (ShouldPrintDebugScopes) {
714 NamedRegionTimer T(DbgTimerName, DWARFGroupName, TimePassesIsEnabled);
715 DD->endInstruction(II);
720 // If the last instruction was a prolog label, then we have a situation where
721 // we emitted a prolog but no function body. This results in the ending prolog
722 // label equaling the end of function label and an invalid "row" in the
723 // FDE. We need to emit a noop in this situation so that the FDE's rows are
725 bool RequiresNoop = LastMI && LastMI->isPrologLabel();
727 // If the function is empty and the object file uses .subsections_via_symbols,
728 // then we need to emit *something* to the function body to prevent the
729 // labels from collapsing together. Just emit a noop.
730 if ((MAI->hasSubsectionsViaSymbols() && !HasAnyRealCode) || RequiresNoop) {
732 TM.getInstrInfo()->getNoopForMachoTarget(Noop);
733 if (Noop.getOpcode()) {
734 OutStreamer.AddComment("avoids zero-length function");
735 OutStreamer.EmitInstruction(Noop);
736 } else // Target not mc-ized yet.
737 OutStreamer.EmitRawText(StringRef("\tnop\n"));
740 const Function *F = MF->getFunction();
741 for (Function::const_iterator i = F->begin(), e = F->end(); i != e; ++i) {
742 const BasicBlock *BB = i;
743 if (!BB->hasAddressTaken())
745 MCSymbol *Sym = GetBlockAddressSymbol(BB);
746 if (Sym->isDefined())
748 OutStreamer.AddComment("Address of block that was removed by CodeGen");
749 OutStreamer.EmitLabel(Sym);
752 // Emit target-specific gunk after the function body.
753 EmitFunctionBodyEnd();
755 // If the target wants a .size directive for the size of the function, emit
757 if (MAI->hasDotTypeDotSizeDirective()) {
758 // Create a symbol for the end of function, so we can get the size as
759 // difference between the function label and the temp label.
760 MCSymbol *FnEndLabel = OutContext.CreateTempSymbol();
761 OutStreamer.EmitLabel(FnEndLabel);
763 const MCExpr *SizeExp =
764 MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(FnEndLabel, OutContext),
765 MCSymbolRefExpr::Create(CurrentFnSymForSize,
768 OutStreamer.EmitELFSize(CurrentFnSym, SizeExp);
771 // Emit post-function debug information.
773 NamedRegionTimer T(DbgTimerName, DWARFGroupName, TimePassesIsEnabled);
777 NamedRegionTimer T(EHTimerName, DWARFGroupName, TimePassesIsEnabled);
782 // Print out jump tables referenced by the function.
785 OutStreamer.AddBlankLine();
788 /// getDebugValueLocation - Get location information encoded by DBG_VALUE
790 MachineLocation AsmPrinter::
791 getDebugValueLocation(const MachineInstr *MI) const {
792 // Target specific DBG_VALUE instructions are handled by each target.
793 return MachineLocation();
796 /// EmitDwarfRegOp - Emit dwarf register operation.
797 void AsmPrinter::EmitDwarfRegOp(const MachineLocation &MLoc) const {
798 const TargetRegisterInfo *TRI = TM.getRegisterInfo();
799 int Reg = TRI->getDwarfRegNum(MLoc.getReg(), false);
801 for (const uint16_t *SR = TRI->getSuperRegisters(MLoc.getReg());
802 *SR && Reg < 0; ++SR) {
803 Reg = TRI->getDwarfRegNum(*SR, false);
804 // FIXME: Get the bit range this register uses of the superregister
805 // so that we can produce a DW_OP_bit_piece
808 // FIXME: Handle cases like a super register being encoded as
809 // DW_OP_reg 32 DW_OP_piece 4 DW_OP_reg 33
811 // FIXME: We have no reasonable way of handling errors in here. The
812 // caller might be in the middle of an dwarf expression. We should
813 // probably assert that Reg >= 0 once debug info generation is more mature.
815 if (int Offset = MLoc.getOffset()) {
817 OutStreamer.AddComment(
818 dwarf::OperationEncodingString(dwarf::DW_OP_breg0 + Reg));
819 EmitInt8(dwarf::DW_OP_breg0 + Reg);
821 OutStreamer.AddComment("DW_OP_bregx");
822 EmitInt8(dwarf::DW_OP_bregx);
823 OutStreamer.AddComment(Twine(Reg));
829 OutStreamer.AddComment(
830 dwarf::OperationEncodingString(dwarf::DW_OP_reg0 + Reg));
831 EmitInt8(dwarf::DW_OP_reg0 + Reg);
833 OutStreamer.AddComment("DW_OP_regx");
834 EmitInt8(dwarf::DW_OP_regx);
835 OutStreamer.AddComment(Twine(Reg));
840 // FIXME: Produce a DW_OP_bit_piece if we used a superregister
843 bool AsmPrinter::doFinalization(Module &M) {
844 // Emit global variables.
845 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
847 EmitGlobalVariable(I);
849 // Emit visibility info for declarations
850 for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I) {
851 const Function &F = *I;
852 if (!F.isDeclaration())
854 GlobalValue::VisibilityTypes V = F.getVisibility();
855 if (V == GlobalValue::DefaultVisibility)
858 MCSymbol *Name = Mang->getSymbol(&F);
859 EmitVisibility(Name, V, false);
862 // Emit module flags.
863 SmallVector<Module::ModuleFlagEntry, 8> ModuleFlags;
864 M.getModuleFlagsMetadata(ModuleFlags);
865 if (!ModuleFlags.empty())
866 getObjFileLowering().emitModuleFlags(OutStreamer, ModuleFlags, Mang, TM);
868 // Finalize debug and EH information.
871 NamedRegionTimer T(EHTimerName, DWARFGroupName, TimePassesIsEnabled);
878 NamedRegionTimer T(DbgTimerName, DWARFGroupName, TimePassesIsEnabled);
884 // If the target wants to know about weak references, print them all.
885 if (MAI->getWeakRefDirective()) {
886 // FIXME: This is not lazy, it would be nice to only print weak references
887 // to stuff that is actually used. Note that doing so would require targets
888 // to notice uses in operands (due to constant exprs etc). This should
889 // happen with the MC stuff eventually.
891 // Print out module-level global variables here.
892 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
894 if (!I->hasExternalWeakLinkage()) continue;
895 OutStreamer.EmitSymbolAttribute(Mang->getSymbol(I), MCSA_WeakReference);
898 for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I) {
899 if (!I->hasExternalWeakLinkage()) continue;
900 OutStreamer.EmitSymbolAttribute(Mang->getSymbol(I), MCSA_WeakReference);
904 if (MAI->hasSetDirective()) {
905 OutStreamer.AddBlankLine();
906 for (Module::const_alias_iterator I = M.alias_begin(), E = M.alias_end();
908 MCSymbol *Name = Mang->getSymbol(I);
910 const GlobalValue *GV = I->getAliasedGlobal();
911 MCSymbol *Target = Mang->getSymbol(GV);
913 if (I->hasExternalLinkage() || !MAI->getWeakRefDirective())
914 OutStreamer.EmitSymbolAttribute(Name, MCSA_Global);
915 else if (I->hasWeakLinkage())
916 OutStreamer.EmitSymbolAttribute(Name, MCSA_WeakReference);
918 assert(I->hasLocalLinkage() && "Invalid alias linkage");
920 EmitVisibility(Name, I->getVisibility());
922 // Emit the directives as assignments aka .set:
923 OutStreamer.EmitAssignment(Name,
924 MCSymbolRefExpr::Create(Target, OutContext));
928 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
929 assert(MI && "AsmPrinter didn't require GCModuleInfo?");
930 for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; )
931 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*--I))
932 MP->finishAssembly(*this);
934 // If we don't have any trampolines, then we don't require stack memory
935 // to be executable. Some targets have a directive to declare this.
936 Function *InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline");
937 if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty())
938 if (const MCSection *S = MAI->getNonexecutableStackSection(OutContext))
939 OutStreamer.SwitchSection(S);
941 // Allow the target to emit any magic that it wants at the end of the file,
942 // after everything else has gone out.
945 delete Mang; Mang = 0;
948 OutStreamer.Finish();
952 void AsmPrinter::SetupMachineFunction(MachineFunction &MF) {
954 // Get the function symbol.
955 CurrentFnSym = Mang->getSymbol(MF.getFunction());
956 CurrentFnSymForSize = CurrentFnSym;
959 LI = &getAnalysis<MachineLoopInfo>();
963 // SectionCPs - Keep track the alignment, constpool entries per Section.
967 SmallVector<unsigned, 4> CPEs;
968 SectionCPs(const MCSection *s, unsigned a) : S(s), Alignment(a) {}
972 /// EmitConstantPool - Print to the current output stream assembly
973 /// representations of the constants in the constant pool MCP. This is
974 /// used to print out constants which have been "spilled to memory" by
975 /// the code generator.
977 void AsmPrinter::EmitConstantPool() {
978 const MachineConstantPool *MCP = MF->getConstantPool();
979 const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
980 if (CP.empty()) return;
982 // Calculate sections for constant pool entries. We collect entries to go into
983 // the same section together to reduce amount of section switch statements.
984 SmallVector<SectionCPs, 4> CPSections;
985 for (unsigned i = 0, e = CP.size(); i != e; ++i) {
986 const MachineConstantPoolEntry &CPE = CP[i];
987 unsigned Align = CPE.getAlignment();
990 switch (CPE.getRelocationInfo()) {
991 default: llvm_unreachable("Unknown section kind");
992 case 2: Kind = SectionKind::getReadOnlyWithRel(); break;
994 Kind = SectionKind::getReadOnlyWithRelLocal();
997 switch (TM.getTargetData()->getTypeAllocSize(CPE.getType())) {
998 case 4: Kind = SectionKind::getMergeableConst4(); break;
999 case 8: Kind = SectionKind::getMergeableConst8(); break;
1000 case 16: Kind = SectionKind::getMergeableConst16();break;
1001 default: Kind = SectionKind::getMergeableConst(); break;
1005 const MCSection *S = getObjFileLowering().getSectionForConstant(Kind);
1007 // The number of sections are small, just do a linear search from the
1008 // last section to the first.
1010 unsigned SecIdx = CPSections.size();
1011 while (SecIdx != 0) {
1012 if (CPSections[--SecIdx].S == S) {
1018 SecIdx = CPSections.size();
1019 CPSections.push_back(SectionCPs(S, Align));
1022 if (Align > CPSections[SecIdx].Alignment)
1023 CPSections[SecIdx].Alignment = Align;
1024 CPSections[SecIdx].CPEs.push_back(i);
1027 // Now print stuff into the calculated sections.
1028 for (unsigned i = 0, e = CPSections.size(); i != e; ++i) {
1029 OutStreamer.SwitchSection(CPSections[i].S);
1030 EmitAlignment(Log2_32(CPSections[i].Alignment));
1032 unsigned Offset = 0;
1033 for (unsigned j = 0, ee = CPSections[i].CPEs.size(); j != ee; ++j) {
1034 unsigned CPI = CPSections[i].CPEs[j];
1035 MachineConstantPoolEntry CPE = CP[CPI];
1037 // Emit inter-object padding for alignment.
1038 unsigned AlignMask = CPE.getAlignment() - 1;
1039 unsigned NewOffset = (Offset + AlignMask) & ~AlignMask;
1040 OutStreamer.EmitFill(NewOffset - Offset, 0/*fillval*/, 0/*addrspace*/);
1042 Type *Ty = CPE.getType();
1043 Offset = NewOffset + TM.getTargetData()->getTypeAllocSize(Ty);
1044 OutStreamer.EmitLabel(GetCPISymbol(CPI));
1046 if (CPE.isMachineConstantPoolEntry())
1047 EmitMachineConstantPoolValue(CPE.Val.MachineCPVal);
1049 EmitGlobalConstant(CPE.Val.ConstVal);
1054 /// EmitJumpTableInfo - Print assembly representations of the jump tables used
1055 /// by the current function to the current output stream.
1057 void AsmPrinter::EmitJumpTableInfo() {
1058 const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo();
1059 if (MJTI == 0) return;
1060 if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_Inline) return;
1061 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
1062 if (JT.empty()) return;
1064 // Pick the directive to use to print the jump table entries, and switch to
1065 // the appropriate section.
1066 const Function *F = MF->getFunction();
1067 bool JTInDiffSection = false;
1068 if (// In PIC mode, we need to emit the jump table to the same section as the
1069 // function body itself, otherwise the label differences won't make sense.
1070 // FIXME: Need a better predicate for this: what about custom entries?
1071 MJTI->getEntryKind() == MachineJumpTableInfo::EK_LabelDifference32 ||
1072 // We should also do if the section name is NULL or function is declared
1073 // in discardable section
1074 // FIXME: this isn't the right predicate, should be based on the MCSection
1075 // for the function.
1076 F->isWeakForLinker()) {
1077 OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F,Mang,TM));
1079 // Otherwise, drop it in the readonly section.
1080 const MCSection *ReadOnlySection =
1081 getObjFileLowering().getSectionForConstant(SectionKind::getReadOnly());
1082 OutStreamer.SwitchSection(ReadOnlySection);
1083 JTInDiffSection = true;
1086 EmitAlignment(Log2_32(MJTI->getEntryAlignment(*TM.getTargetData())));
1088 // If we know the form of the jump table, go ahead and tag it as such.
1089 if (!JTInDiffSection) {
1090 if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_LabelDifference32) {
1091 OutStreamer.EmitJumpTable32Region();
1093 OutStreamer.EmitDataRegion();
1097 for (unsigned JTI = 0, e = JT.size(); JTI != e; ++JTI) {
1098 const std::vector<MachineBasicBlock*> &JTBBs = JT[JTI].MBBs;
1100 // If this jump table was deleted, ignore it.
1101 if (JTBBs.empty()) continue;
1103 // For the EK_LabelDifference32 entry, if the target supports .set, emit a
1104 // .set directive for each unique entry. This reduces the number of
1105 // relocations the assembler will generate for the jump table.
1106 if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_LabelDifference32 &&
1107 MAI->hasSetDirective()) {
1108 SmallPtrSet<const MachineBasicBlock*, 16> EmittedSets;
1109 const TargetLowering *TLI = TM.getTargetLowering();
1110 const MCExpr *Base = TLI->getPICJumpTableRelocBaseExpr(MF,JTI,OutContext);
1111 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
1112 const MachineBasicBlock *MBB = JTBBs[ii];
1113 if (!EmittedSets.insert(MBB)) continue;
1115 // .set LJTSet, LBB32-base
1117 MCSymbolRefExpr::Create(MBB->getSymbol(), OutContext);
1118 OutStreamer.EmitAssignment(GetJTSetSymbol(JTI, MBB->getNumber()),
1119 MCBinaryExpr::CreateSub(LHS, Base, OutContext));
1123 // On some targets (e.g. Darwin) we want to emit two consecutive labels
1124 // before each jump table. The first label is never referenced, but tells
1125 // the assembler and linker the extents of the jump table object. The
1126 // second label is actually referenced by the code.
1127 if (JTInDiffSection && MAI->getLinkerPrivateGlobalPrefix()[0])
1128 // FIXME: This doesn't have to have any specific name, just any randomly
1129 // named and numbered 'l' label would work. Simplify GetJTISymbol.
1130 OutStreamer.EmitLabel(GetJTISymbol(JTI, true));
1132 OutStreamer.EmitLabel(GetJTISymbol(JTI));
1134 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
1135 EmitJumpTableEntry(MJTI, JTBBs[ii], JTI);
1139 /// EmitJumpTableEntry - Emit a jump table entry for the specified MBB to the
1141 void AsmPrinter::EmitJumpTableEntry(const MachineJumpTableInfo *MJTI,
1142 const MachineBasicBlock *MBB,
1143 unsigned UID) const {
1144 assert(MBB && MBB->getNumber() >= 0 && "Invalid basic block");
1145 const MCExpr *Value = 0;
1146 switch (MJTI->getEntryKind()) {
1147 case MachineJumpTableInfo::EK_Inline:
1148 llvm_unreachable("Cannot emit EK_Inline jump table entry");
1149 case MachineJumpTableInfo::EK_Custom32:
1150 Value = TM.getTargetLowering()->LowerCustomJumpTableEntry(MJTI, MBB, UID,
1153 case MachineJumpTableInfo::EK_BlockAddress:
1154 // EK_BlockAddress - Each entry is a plain address of block, e.g.:
1156 Value = MCSymbolRefExpr::Create(MBB->getSymbol(), OutContext);
1158 case MachineJumpTableInfo::EK_GPRel32BlockAddress: {
1159 // EK_GPRel32BlockAddress - Each entry is an address of block, encoded
1160 // with a relocation as gp-relative, e.g.:
1162 MCSymbol *MBBSym = MBB->getSymbol();
1163 OutStreamer.EmitGPRel32Value(MCSymbolRefExpr::Create(MBBSym, OutContext));
1167 case MachineJumpTableInfo::EK_GPRel64BlockAddress: {
1168 // EK_GPRel64BlockAddress - Each entry is an address of block, encoded
1169 // with a relocation as gp-relative, e.g.:
1171 MCSymbol *MBBSym = MBB->getSymbol();
1172 OutStreamer.EmitGPRel64Value(MCSymbolRefExpr::Create(MBBSym, OutContext));
1176 case MachineJumpTableInfo::EK_LabelDifference32: {
1177 // EK_LabelDifference32 - Each entry is the address of the block minus
1178 // the address of the jump table. This is used for PIC jump tables where
1179 // gprel32 is not supported. e.g.:
1180 // .word LBB123 - LJTI1_2
1181 // If the .set directive is supported, this is emitted as:
1182 // .set L4_5_set_123, LBB123 - LJTI1_2
1183 // .word L4_5_set_123
1185 // If we have emitted set directives for the jump table entries, print
1186 // them rather than the entries themselves. If we're emitting PIC, then
1187 // emit the table entries as differences between two text section labels.
1188 if (MAI->hasSetDirective()) {
1189 // If we used .set, reference the .set's symbol.
1190 Value = MCSymbolRefExpr::Create(GetJTSetSymbol(UID, MBB->getNumber()),
1194 // Otherwise, use the difference as the jump table entry.
1195 Value = MCSymbolRefExpr::Create(MBB->getSymbol(), OutContext);
1196 const MCExpr *JTI = MCSymbolRefExpr::Create(GetJTISymbol(UID), OutContext);
1197 Value = MCBinaryExpr::CreateSub(Value, JTI, OutContext);
1202 assert(Value && "Unknown entry kind!");
1204 unsigned EntrySize = MJTI->getEntrySize(*TM.getTargetData());
1205 OutStreamer.EmitValue(Value, EntrySize, /*addrspace*/0);
1209 /// EmitSpecialLLVMGlobal - Check to see if the specified global is a
1210 /// special global used by LLVM. If so, emit it and return true, otherwise
1211 /// do nothing and return false.
1212 bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
1213 if (GV->getName() == "llvm.used") {
1214 if (MAI->hasNoDeadStrip()) // No need to emit this at all.
1215 EmitLLVMUsedList(GV->getInitializer());
1219 // Ignore debug and non-emitted data. This handles llvm.compiler.used.
1220 if (GV->getSection() == "llvm.metadata" ||
1221 GV->hasAvailableExternallyLinkage())
1224 if (!GV->hasAppendingLinkage()) return false;
1226 assert(GV->hasInitializer() && "Not a special LLVM global!");
1228 if (GV->getName() == "llvm.global_ctors") {
1229 EmitXXStructorList(GV->getInitializer(), /* isCtor */ true);
1231 if (TM.getRelocationModel() == Reloc::Static &&
1232 MAI->hasStaticCtorDtorReferenceInStaticMode()) {
1233 StringRef Sym(".constructors_used");
1234 OutStreamer.EmitSymbolAttribute(OutContext.GetOrCreateSymbol(Sym),
1240 if (GV->getName() == "llvm.global_dtors") {
1241 EmitXXStructorList(GV->getInitializer(), /* isCtor */ false);
1243 if (TM.getRelocationModel() == Reloc::Static &&
1244 MAI->hasStaticCtorDtorReferenceInStaticMode()) {
1245 StringRef Sym(".destructors_used");
1246 OutStreamer.EmitSymbolAttribute(OutContext.GetOrCreateSymbol(Sym),
1255 /// EmitLLVMUsedList - For targets that define a MAI::UsedDirective, mark each
1256 /// global in the specified llvm.used list for which emitUsedDirectiveFor
1257 /// is true, as being used with this directive.
1258 void AsmPrinter::EmitLLVMUsedList(const Constant *List) {
1259 // Should be an array of 'i8*'.
1260 const ConstantArray *InitList = dyn_cast<ConstantArray>(List);
1261 if (InitList == 0) return;
1263 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
1264 const GlobalValue *GV =
1265 dyn_cast<GlobalValue>(InitList->getOperand(i)->stripPointerCasts());
1266 if (GV && getObjFileLowering().shouldEmitUsedDirectiveFor(GV, Mang))
1267 OutStreamer.EmitSymbolAttribute(Mang->getSymbol(GV), MCSA_NoDeadStrip);
1271 typedef std::pair<unsigned, Constant*> Structor;
1273 static bool priority_order(const Structor& lhs, const Structor& rhs) {
1274 return lhs.first < rhs.first;
1277 /// EmitXXStructorList - Emit the ctor or dtor list taking into account the init
1279 void AsmPrinter::EmitXXStructorList(const Constant *List, bool isCtor) {
1280 // Should be an array of '{ int, void ()* }' structs. The first value is the
1282 if (!isa<ConstantArray>(List)) return;
1284 // Sanity check the structors list.
1285 const ConstantArray *InitList = dyn_cast<ConstantArray>(List);
1286 if (!InitList) return; // Not an array!
1287 StructType *ETy = dyn_cast<StructType>(InitList->getType()->getElementType());
1288 if (!ETy || ETy->getNumElements() != 2) return; // Not an array of pairs!
1289 if (!isa<IntegerType>(ETy->getTypeAtIndex(0U)) ||
1290 !isa<PointerType>(ETy->getTypeAtIndex(1U))) return; // Not (int, ptr).
1292 // Gather the structors in a form that's convenient for sorting by priority.
1293 SmallVector<Structor, 8> Structors;
1294 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
1295 ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i));
1296 if (!CS) continue; // Malformed.
1297 if (CS->getOperand(1)->isNullValue())
1298 break; // Found a null terminator, skip the rest.
1299 ConstantInt *Priority = dyn_cast<ConstantInt>(CS->getOperand(0));
1300 if (!Priority) continue; // Malformed.
1301 Structors.push_back(std::make_pair(Priority->getLimitedValue(65535),
1302 CS->getOperand(1)));
1305 // Emit the function pointers in the target-specific order
1306 const TargetData *TD = TM.getTargetData();
1307 unsigned Align = Log2_32(TD->getPointerPrefAlignment());
1308 std::stable_sort(Structors.begin(), Structors.end(), priority_order);
1309 for (unsigned i = 0, e = Structors.size(); i != e; ++i) {
1310 const MCSection *OutputSection =
1312 getObjFileLowering().getStaticCtorSection(Structors[i].first) :
1313 getObjFileLowering().getStaticDtorSection(Structors[i].first));
1314 OutStreamer.SwitchSection(OutputSection);
1315 if (OutStreamer.getCurrentSection() != OutStreamer.getPreviousSection())
1316 EmitAlignment(Align);
1317 EmitXXStructor(Structors[i].second);
1321 //===--------------------------------------------------------------------===//
1322 // Emission and print routines
1325 /// EmitInt8 - Emit a byte directive and value.
1327 void AsmPrinter::EmitInt8(int Value) const {
1328 OutStreamer.EmitIntValue(Value, 1, 0/*addrspace*/);
1331 /// EmitInt16 - Emit a short directive and value.
1333 void AsmPrinter::EmitInt16(int Value) const {
1334 OutStreamer.EmitIntValue(Value, 2, 0/*addrspace*/);
1337 /// EmitInt32 - Emit a long directive and value.
1339 void AsmPrinter::EmitInt32(int Value) const {
1340 OutStreamer.EmitIntValue(Value, 4, 0/*addrspace*/);
1343 /// EmitLabelDifference - Emit something like ".long Hi-Lo" where the size
1344 /// in bytes of the directive is specified by Size and Hi/Lo specify the
1345 /// labels. This implicitly uses .set if it is available.
1346 void AsmPrinter::EmitLabelDifference(const MCSymbol *Hi, const MCSymbol *Lo,
1347 unsigned Size) const {
1348 // Get the Hi-Lo expression.
1349 const MCExpr *Diff =
1350 MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(Hi, OutContext),
1351 MCSymbolRefExpr::Create(Lo, OutContext),
1354 if (!MAI->hasSetDirective()) {
1355 OutStreamer.EmitValue(Diff, Size, 0/*AddrSpace*/);
1359 // Otherwise, emit with .set (aka assignment).
1360 MCSymbol *SetLabel = GetTempSymbol("set", SetCounter++);
1361 OutStreamer.EmitAssignment(SetLabel, Diff);
1362 OutStreamer.EmitSymbolValue(SetLabel, Size, 0/*AddrSpace*/);
1365 /// EmitLabelOffsetDifference - Emit something like ".long Hi+Offset-Lo"
1366 /// where the size in bytes of the directive is specified by Size and Hi/Lo
1367 /// specify the labels. This implicitly uses .set if it is available.
1368 void AsmPrinter::EmitLabelOffsetDifference(const MCSymbol *Hi, uint64_t Offset,
1369 const MCSymbol *Lo, unsigned Size)
1372 // Emit Hi+Offset - Lo
1373 // Get the Hi+Offset expression.
1374 const MCExpr *Plus =
1375 MCBinaryExpr::CreateAdd(MCSymbolRefExpr::Create(Hi, OutContext),
1376 MCConstantExpr::Create(Offset, OutContext),
1379 // Get the Hi+Offset-Lo expression.
1380 const MCExpr *Diff =
1381 MCBinaryExpr::CreateSub(Plus,
1382 MCSymbolRefExpr::Create(Lo, OutContext),
1385 if (!MAI->hasSetDirective())
1386 OutStreamer.EmitValue(Diff, 4, 0/*AddrSpace*/);
1388 // Otherwise, emit with .set (aka assignment).
1389 MCSymbol *SetLabel = GetTempSymbol("set", SetCounter++);
1390 OutStreamer.EmitAssignment(SetLabel, Diff);
1391 OutStreamer.EmitSymbolValue(SetLabel, 4, 0/*AddrSpace*/);
1395 /// EmitLabelPlusOffset - Emit something like ".long Label+Offset"
1396 /// where the size in bytes of the directive is specified by Size and Label
1397 /// specifies the label. This implicitly uses .set if it is available.
1398 void AsmPrinter::EmitLabelPlusOffset(const MCSymbol *Label, uint64_t Offset,
1402 // Emit Label+Offset
1403 const MCExpr *Plus =
1404 MCBinaryExpr::CreateAdd(MCSymbolRefExpr::Create(Label, OutContext),
1405 MCConstantExpr::Create(Offset, OutContext),
1408 OutStreamer.EmitValue(Plus, 4, 0/*AddrSpace*/);
1412 //===----------------------------------------------------------------------===//
1414 // EmitAlignment - Emit an alignment directive to the specified power of
1415 // two boundary. For example, if you pass in 3 here, you will get an 8
1416 // byte alignment. If a global value is specified, and if that global has
1417 // an explicit alignment requested, it will override the alignment request
1418 // if required for correctness.
1420 void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV) const {
1421 if (GV) NumBits = getGVAlignmentLog2(GV, *TM.getTargetData(), NumBits);
1423 if (NumBits == 0) return; // 1-byte aligned: no need to emit alignment.
1425 if (getCurrentSection()->getKind().isText())
1426 OutStreamer.EmitCodeAlignment(1 << NumBits);
1428 OutStreamer.EmitValueToAlignment(1 << NumBits, 0, 1, 0);
1431 //===----------------------------------------------------------------------===//
1432 // Constant emission.
1433 //===----------------------------------------------------------------------===//
1435 /// LowerConstant - Lower the specified LLVM Constant to an MCExpr.
1437 static const MCExpr *LowerConstant(const Constant *CV, AsmPrinter &AP) {
1438 MCContext &Ctx = AP.OutContext;
1440 if (CV->isNullValue() || isa<UndefValue>(CV))
1441 return MCConstantExpr::Create(0, Ctx);
1443 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV))
1444 return MCConstantExpr::Create(CI->getZExtValue(), Ctx);
1446 if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV))
1447 return MCSymbolRefExpr::Create(AP.Mang->getSymbol(GV), Ctx);
1449 if (const BlockAddress *BA = dyn_cast<BlockAddress>(CV))
1450 return MCSymbolRefExpr::Create(AP.GetBlockAddressSymbol(BA), Ctx);
1452 const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV);
1454 llvm_unreachable("Unknown constant value to lower!");
1457 switch (CE->getOpcode()) {
1459 // If the code isn't optimized, there may be outstanding folding
1460 // opportunities. Attempt to fold the expression using TargetData as a
1461 // last resort before giving up.
1463 ConstantFoldConstantExpression(CE, AP.TM.getTargetData()))
1465 return LowerConstant(C, AP);
1467 // Otherwise report the problem to the user.
1470 raw_string_ostream OS(S);
1471 OS << "Unsupported expression in static initializer: ";
1472 WriteAsOperand(OS, CE, /*PrintType=*/false,
1473 !AP.MF ? 0 : AP.MF->getFunction()->getParent());
1474 report_fatal_error(OS.str());
1476 case Instruction::GetElementPtr: {
1477 const TargetData &TD = *AP.TM.getTargetData();
1478 // Generate a symbolic expression for the byte address
1479 const Constant *PtrVal = CE->getOperand(0);
1480 SmallVector<Value*, 8> IdxVec(CE->op_begin()+1, CE->op_end());
1481 int64_t Offset = TD.getIndexedOffset(PtrVal->getType(), IdxVec);
1483 const MCExpr *Base = LowerConstant(CE->getOperand(0), AP);
1487 // Truncate/sext the offset to the pointer size.
1488 if (TD.getPointerSizeInBits() != 64) {
1489 int SExtAmount = 64-TD.getPointerSizeInBits();
1490 Offset = (Offset << SExtAmount) >> SExtAmount;
1493 return MCBinaryExpr::CreateAdd(Base, MCConstantExpr::Create(Offset, Ctx),
1497 case Instruction::Trunc:
1498 // We emit the value and depend on the assembler to truncate the generated
1499 // expression properly. This is important for differences between
1500 // blockaddress labels. Since the two labels are in the same function, it
1501 // is reasonable to treat their delta as a 32-bit value.
1503 case Instruction::BitCast:
1504 return LowerConstant(CE->getOperand(0), AP);
1506 case Instruction::IntToPtr: {
1507 const TargetData &TD = *AP.TM.getTargetData();
1508 // Handle casts to pointers by changing them into casts to the appropriate
1509 // integer type. This promotes constant folding and simplifies this code.
1510 Constant *Op = CE->getOperand(0);
1511 Op = ConstantExpr::getIntegerCast(Op, TD.getIntPtrType(CV->getContext()),
1513 return LowerConstant(Op, AP);
1516 case Instruction::PtrToInt: {
1517 const TargetData &TD = *AP.TM.getTargetData();
1518 // Support only foldable casts to/from pointers that can be eliminated by
1519 // changing the pointer to the appropriately sized integer type.
1520 Constant *Op = CE->getOperand(0);
1521 Type *Ty = CE->getType();
1523 const MCExpr *OpExpr = LowerConstant(Op, AP);
1525 // We can emit the pointer value into this slot if the slot is an
1526 // integer slot equal to the size of the pointer.
1527 if (TD.getTypeAllocSize(Ty) == TD.getTypeAllocSize(Op->getType()))
1530 // Otherwise the pointer is smaller than the resultant integer, mask off
1531 // the high bits so we are sure to get a proper truncation if the input is
1533 unsigned InBits = TD.getTypeAllocSizeInBits(Op->getType());
1534 const MCExpr *MaskExpr = MCConstantExpr::Create(~0ULL >> (64-InBits), Ctx);
1535 return MCBinaryExpr::CreateAnd(OpExpr, MaskExpr, Ctx);
1538 // The MC library also has a right-shift operator, but it isn't consistently
1539 // signed or unsigned between different targets.
1540 case Instruction::Add:
1541 case Instruction::Sub:
1542 case Instruction::Mul:
1543 case Instruction::SDiv:
1544 case Instruction::SRem:
1545 case Instruction::Shl:
1546 case Instruction::And:
1547 case Instruction::Or:
1548 case Instruction::Xor: {
1549 const MCExpr *LHS = LowerConstant(CE->getOperand(0), AP);
1550 const MCExpr *RHS = LowerConstant(CE->getOperand(1), AP);
1551 switch (CE->getOpcode()) {
1552 default: llvm_unreachable("Unknown binary operator constant cast expr");
1553 case Instruction::Add: return MCBinaryExpr::CreateAdd(LHS, RHS, Ctx);
1554 case Instruction::Sub: return MCBinaryExpr::CreateSub(LHS, RHS, Ctx);
1555 case Instruction::Mul: return MCBinaryExpr::CreateMul(LHS, RHS, Ctx);
1556 case Instruction::SDiv: return MCBinaryExpr::CreateDiv(LHS, RHS, Ctx);
1557 case Instruction::SRem: return MCBinaryExpr::CreateMod(LHS, RHS, Ctx);
1558 case Instruction::Shl: return MCBinaryExpr::CreateShl(LHS, RHS, Ctx);
1559 case Instruction::And: return MCBinaryExpr::CreateAnd(LHS, RHS, Ctx);
1560 case Instruction::Or: return MCBinaryExpr::CreateOr (LHS, RHS, Ctx);
1561 case Instruction::Xor: return MCBinaryExpr::CreateXor(LHS, RHS, Ctx);
1567 static void EmitGlobalConstantImpl(const Constant *C, unsigned AddrSpace,
1570 /// isRepeatedByteSequence - Determine whether the given value is
1571 /// composed of a repeated sequence of identical bytes and return the
1572 /// byte value. If it is not a repeated sequence, return -1.
1573 static int isRepeatedByteSequence(const ConstantDataSequential *V) {
1574 StringRef Data = V->getRawDataValues();
1575 assert(!Data.empty() && "Empty aggregates should be CAZ node");
1577 for (unsigned i = 1, e = Data.size(); i != e; ++i)
1578 if (Data[i] != C) return -1;
1579 return static_cast<uint8_t>(C); // Ensure 255 is not returned as -1.
1583 /// isRepeatedByteSequence - Determine whether the given value is
1584 /// composed of a repeated sequence of identical bytes and return the
1585 /// byte value. If it is not a repeated sequence, return -1.
1586 static int isRepeatedByteSequence(const Value *V, TargetMachine &TM) {
1588 if (const ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
1589 if (CI->getBitWidth() > 64) return -1;
1591 uint64_t Size = TM.getTargetData()->getTypeAllocSize(V->getType());
1592 uint64_t Value = CI->getZExtValue();
1594 // Make sure the constant is at least 8 bits long and has a power
1595 // of 2 bit width. This guarantees the constant bit width is
1596 // always a multiple of 8 bits, avoiding issues with padding out
1597 // to Size and other such corner cases.
1598 if (CI->getBitWidth() < 8 || !isPowerOf2_64(CI->getBitWidth())) return -1;
1600 uint8_t Byte = static_cast<uint8_t>(Value);
1602 for (unsigned i = 1; i < Size; ++i) {
1604 if (static_cast<uint8_t>(Value) != Byte) return -1;
1608 if (const ConstantArray *CA = dyn_cast<ConstantArray>(V)) {
1609 // Make sure all array elements are sequences of the same repeated
1611 assert(CA->getNumOperands() != 0 && "Should be a CAZ");
1612 int Byte = isRepeatedByteSequence(CA->getOperand(0), TM);
1613 if (Byte == -1) return -1;
1615 for (unsigned i = 1, e = CA->getNumOperands(); i != e; ++i) {
1616 int ThisByte = isRepeatedByteSequence(CA->getOperand(i), TM);
1617 if (ThisByte == -1) return -1;
1618 if (Byte != ThisByte) return -1;
1623 if (const ConstantDataSequential *CDS = dyn_cast<ConstantDataSequential>(V))
1624 return isRepeatedByteSequence(CDS);
1629 static void EmitGlobalConstantDataSequential(const ConstantDataSequential *CDS,
1630 unsigned AddrSpace,AsmPrinter &AP){
1632 // See if we can aggregate this into a .fill, if so, emit it as such.
1633 int Value = isRepeatedByteSequence(CDS, AP.TM);
1635 uint64_t Bytes = AP.TM.getTargetData()->getTypeAllocSize(CDS->getType());
1636 // Don't emit a 1-byte object as a .fill.
1638 return AP.OutStreamer.EmitFill(Bytes, Value, AddrSpace);
1641 // If this can be emitted with .ascii/.asciz, emit it as such.
1642 if (CDS->isString())
1643 return AP.OutStreamer.EmitBytes(CDS->getAsString(), AddrSpace);
1645 // Otherwise, emit the values in successive locations.
1646 unsigned ElementByteSize = CDS->getElementByteSize();
1647 if (isa<IntegerType>(CDS->getElementType())) {
1648 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) {
1650 AP.OutStreamer.GetCommentOS() << format("0x%" PRIx64 "\n",
1651 CDS->getElementAsInteger(i));
1652 AP.OutStreamer.EmitIntValue(CDS->getElementAsInteger(i),
1653 ElementByteSize, AddrSpace);
1655 } else if (ElementByteSize == 4) {
1656 // FP Constants are printed as integer constants to avoid losing
1658 assert(CDS->getElementType()->isFloatTy());
1659 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) {
1665 F = CDS->getElementAsFloat(i);
1667 AP.OutStreamer.GetCommentOS() << "float " << F << '\n';
1668 AP.OutStreamer.EmitIntValue(I, 4, AddrSpace);
1671 assert(CDS->getElementType()->isDoubleTy());
1672 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) {
1678 F = CDS->getElementAsDouble(i);
1680 AP.OutStreamer.GetCommentOS() << "double " << F << '\n';
1681 AP.OutStreamer.EmitIntValue(I, 8, AddrSpace);
1685 const TargetData &TD = *AP.TM.getTargetData();
1686 unsigned Size = TD.getTypeAllocSize(CDS->getType());
1687 unsigned EmittedSize = TD.getTypeAllocSize(CDS->getType()->getElementType()) *
1688 CDS->getNumElements();
1689 if (unsigned Padding = Size - EmittedSize)
1690 AP.OutStreamer.EmitZeros(Padding, AddrSpace);
1694 static void EmitGlobalConstantArray(const ConstantArray *CA, unsigned AddrSpace,
1696 // See if we can aggregate some values. Make sure it can be
1697 // represented as a series of bytes of the constant value.
1698 int Value = isRepeatedByteSequence(CA, AP.TM);
1701 uint64_t Bytes = AP.TM.getTargetData()->getTypeAllocSize(CA->getType());
1702 AP.OutStreamer.EmitFill(Bytes, Value, AddrSpace);
1705 for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i)
1706 EmitGlobalConstantImpl(CA->getOperand(i), AddrSpace, AP);
1710 static void EmitGlobalConstantVector(const ConstantVector *CV,
1711 unsigned AddrSpace, AsmPrinter &AP) {
1712 for (unsigned i = 0, e = CV->getType()->getNumElements(); i != e; ++i)
1713 EmitGlobalConstantImpl(CV->getOperand(i), AddrSpace, AP);
1715 const TargetData &TD = *AP.TM.getTargetData();
1716 unsigned Size = TD.getTypeAllocSize(CV->getType());
1717 unsigned EmittedSize = TD.getTypeAllocSize(CV->getType()->getElementType()) *
1718 CV->getType()->getNumElements();
1719 if (unsigned Padding = Size - EmittedSize)
1720 AP.OutStreamer.EmitZeros(Padding, AddrSpace);
1723 static void EmitGlobalConstantStruct(const ConstantStruct *CS,
1724 unsigned AddrSpace, AsmPrinter &AP) {
1725 // Print the fields in successive locations. Pad to align if needed!
1726 const TargetData *TD = AP.TM.getTargetData();
1727 unsigned Size = TD->getTypeAllocSize(CS->getType());
1728 const StructLayout *Layout = TD->getStructLayout(CS->getType());
1729 uint64_t SizeSoFar = 0;
1730 for (unsigned i = 0, e = CS->getNumOperands(); i != e; ++i) {
1731 const Constant *Field = CS->getOperand(i);
1733 // Check if padding is needed and insert one or more 0s.
1734 uint64_t FieldSize = TD->getTypeAllocSize(Field->getType());
1735 uint64_t PadSize = ((i == e-1 ? Size : Layout->getElementOffset(i+1))
1736 - Layout->getElementOffset(i)) - FieldSize;
1737 SizeSoFar += FieldSize + PadSize;
1739 // Now print the actual field value.
1740 EmitGlobalConstantImpl(Field, AddrSpace, AP);
1742 // Insert padding - this may include padding to increase the size of the
1743 // current field up to the ABI size (if the struct is not packed) as well
1744 // as padding to ensure that the next field starts at the right offset.
1745 AP.OutStreamer.EmitZeros(PadSize, AddrSpace);
1747 assert(SizeSoFar == Layout->getSizeInBytes() &&
1748 "Layout of constant struct may be incorrect!");
1751 static void EmitGlobalConstantFP(const ConstantFP *CFP, unsigned AddrSpace,
1753 if (CFP->getType()->isHalfTy()) {
1754 if (AP.isVerbose()) {
1755 SmallString<10> Str;
1756 CFP->getValueAPF().toString(Str);
1757 AP.OutStreamer.GetCommentOS() << "half " << Str << '\n';
1759 uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1760 AP.OutStreamer.EmitIntValue(Val, 2, AddrSpace);
1764 if (CFP->getType()->isFloatTy()) {
1765 if (AP.isVerbose()) {
1766 float Val = CFP->getValueAPF().convertToFloat();
1767 uint64_t IntVal = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1768 AP.OutStreamer.GetCommentOS() << "float " << Val << '\n'
1769 << " (" << format("0x%x", IntVal) << ")\n";
1771 uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1772 AP.OutStreamer.EmitIntValue(Val, 4, AddrSpace);
1776 // FP Constants are printed as integer constants to avoid losing
1778 if (CFP->getType()->isDoubleTy()) {
1779 if (AP.isVerbose()) {
1780 double Val = CFP->getValueAPF().convertToDouble();
1781 uint64_t IntVal = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1782 AP.OutStreamer.GetCommentOS() << "double " << Val << '\n'
1783 << " (" << format("0x%lx", IntVal) << ")\n";
1786 uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1787 AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace);
1791 if (CFP->getType()->isX86_FP80Ty()) {
1792 // all long double variants are printed as hex
1793 // API needed to prevent premature destruction
1794 APInt API = CFP->getValueAPF().bitcastToAPInt();
1795 const uint64_t *p = API.getRawData();
1796 if (AP.isVerbose()) {
1797 // Convert to double so we can print the approximate val as a comment.
1798 APFloat DoubleVal = CFP->getValueAPF();
1800 DoubleVal.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven,
1802 AP.OutStreamer.GetCommentOS() << "x86_fp80 ~= "
1803 << DoubleVal.convertToDouble() << '\n';
1806 if (AP.TM.getTargetData()->isBigEndian()) {
1807 AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace);
1808 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1810 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1811 AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace);
1814 // Emit the tail padding for the long double.
1815 const TargetData &TD = *AP.TM.getTargetData();
1816 AP.OutStreamer.EmitZeros(TD.getTypeAllocSize(CFP->getType()) -
1817 TD.getTypeStoreSize(CFP->getType()), AddrSpace);
1821 assert(CFP->getType()->isPPC_FP128Ty() &&
1822 "Floating point constant type not handled");
1823 // All long double variants are printed as hex
1824 // API needed to prevent premature destruction.
1825 APInt API = CFP->getValueAPF().bitcastToAPInt();
1826 const uint64_t *p = API.getRawData();
1827 if (AP.TM.getTargetData()->isBigEndian()) {
1828 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1829 AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace);
1831 AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace);
1832 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1836 static void EmitGlobalConstantLargeInt(const ConstantInt *CI,
1837 unsigned AddrSpace, AsmPrinter &AP) {
1838 const TargetData *TD = AP.TM.getTargetData();
1839 unsigned BitWidth = CI->getBitWidth();
1840 assert((BitWidth & 63) == 0 && "only support multiples of 64-bits");
1842 // We don't expect assemblers to support integer data directives
1843 // for more than 64 bits, so we emit the data in at most 64-bit
1844 // quantities at a time.
1845 const uint64_t *RawData = CI->getValue().getRawData();
1846 for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) {
1847 uint64_t Val = TD->isBigEndian() ? RawData[e - i - 1] : RawData[i];
1848 AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace);
1852 static void EmitGlobalConstantImpl(const Constant *CV, unsigned AddrSpace,
1854 const TargetData *TD = AP.TM.getTargetData();
1855 uint64_t Size = TD->getTypeAllocSize(CV->getType());
1856 if (isa<ConstantAggregateZero>(CV) || isa<UndefValue>(CV))
1857 return AP.OutStreamer.EmitZeros(Size, AddrSpace);
1859 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
1866 AP.OutStreamer.GetCommentOS() << format("0x%" PRIx64 "\n",
1867 CI->getZExtValue());
1868 AP.OutStreamer.EmitIntValue(CI->getZExtValue(), Size, AddrSpace);
1871 EmitGlobalConstantLargeInt(CI, AddrSpace, AP);
1876 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV))
1877 return EmitGlobalConstantFP(CFP, AddrSpace, AP);
1879 if (isa<ConstantPointerNull>(CV)) {
1880 AP.OutStreamer.EmitIntValue(0, Size, AddrSpace);
1884 if (const ConstantDataSequential *CDS = dyn_cast<ConstantDataSequential>(CV))
1885 return EmitGlobalConstantDataSequential(CDS, AddrSpace, AP);
1887 if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV))
1888 return EmitGlobalConstantArray(CVA, AddrSpace, AP);
1890 if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV))
1891 return EmitGlobalConstantStruct(CVS, AddrSpace, AP);
1893 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) {
1894 // Look through bitcasts, which might not be able to be MCExpr'ized (e.g. of
1896 if (CE->getOpcode() == Instruction::BitCast)
1897 return EmitGlobalConstantImpl(CE->getOperand(0), AddrSpace, AP);
1900 // If the constant expression's size is greater than 64-bits, then we have
1901 // to emit the value in chunks. Try to constant fold the value and emit it
1903 Constant *New = ConstantFoldConstantExpression(CE, TD);
1904 if (New && New != CE)
1905 return EmitGlobalConstantImpl(New, AddrSpace, AP);
1909 if (const ConstantVector *V = dyn_cast<ConstantVector>(CV))
1910 return EmitGlobalConstantVector(V, AddrSpace, AP);
1912 // Otherwise, it must be a ConstantExpr. Lower it to an MCExpr, then emit it
1913 // thread the streamer with EmitValue.
1914 AP.OutStreamer.EmitValue(LowerConstant(CV, AP), Size, AddrSpace);
1917 /// EmitGlobalConstant - Print a general LLVM constant to the .s file.
1918 void AsmPrinter::EmitGlobalConstant(const Constant *CV, unsigned AddrSpace) {
1919 uint64_t Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
1921 EmitGlobalConstantImpl(CV, AddrSpace, *this);
1922 else if (MAI->hasSubsectionsViaSymbols()) {
1923 // If the global has zero size, emit a single byte so that two labels don't
1924 // look like they are at the same location.
1925 OutStreamer.EmitIntValue(0, 1, AddrSpace);
1929 void AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
1930 // Target doesn't support this yet!
1931 llvm_unreachable("Target does not support EmitMachineConstantPoolValue");
1934 void AsmPrinter::printOffset(int64_t Offset, raw_ostream &OS) const {
1936 OS << '+' << Offset;
1937 else if (Offset < 0)
1941 //===----------------------------------------------------------------------===//
1942 // Symbol Lowering Routines.
1943 //===----------------------------------------------------------------------===//
1945 /// GetTempSymbol - Return the MCSymbol corresponding to the assembler
1946 /// temporary label with the specified stem and unique ID.
1947 MCSymbol *AsmPrinter::GetTempSymbol(StringRef Name, unsigned ID) const {
1948 return OutContext.GetOrCreateSymbol(Twine(MAI->getPrivateGlobalPrefix()) +
1952 /// GetTempSymbol - Return an assembler temporary label with the specified
1954 MCSymbol *AsmPrinter::GetTempSymbol(StringRef Name) const {
1955 return OutContext.GetOrCreateSymbol(Twine(MAI->getPrivateGlobalPrefix())+
1960 MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BlockAddress *BA) const {
1961 return MMI->getAddrLabelSymbol(BA->getBasicBlock());
1964 MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BasicBlock *BB) const {
1965 return MMI->getAddrLabelSymbol(BB);
1968 /// GetCPISymbol - Return the symbol for the specified constant pool entry.
1969 MCSymbol *AsmPrinter::GetCPISymbol(unsigned CPID) const {
1970 return OutContext.GetOrCreateSymbol
1971 (Twine(MAI->getPrivateGlobalPrefix()) + "CPI" + Twine(getFunctionNumber())
1972 + "_" + Twine(CPID));
1975 /// GetJTISymbol - Return the symbol for the specified jump table entry.
1976 MCSymbol *AsmPrinter::GetJTISymbol(unsigned JTID, bool isLinkerPrivate) const {
1977 return MF->getJTISymbol(JTID, OutContext, isLinkerPrivate);
1980 /// GetJTSetSymbol - Return the symbol for the specified jump table .set
1981 /// FIXME: privatize to AsmPrinter.
1982 MCSymbol *AsmPrinter::GetJTSetSymbol(unsigned UID, unsigned MBBID) const {
1983 return OutContext.GetOrCreateSymbol
1984 (Twine(MAI->getPrivateGlobalPrefix()) + Twine(getFunctionNumber()) + "_" +
1985 Twine(UID) + "_set_" + Twine(MBBID));
1988 /// GetSymbolWithGlobalValueBase - Return the MCSymbol for a symbol with
1989 /// global value name as its base, with the specified suffix, and where the
1990 /// symbol is forced to have private linkage if ForcePrivate is true.
1991 MCSymbol *AsmPrinter::GetSymbolWithGlobalValueBase(const GlobalValue *GV,
1993 bool ForcePrivate) const {
1994 SmallString<60> NameStr;
1995 Mang->getNameWithPrefix(NameStr, GV, ForcePrivate);
1996 NameStr.append(Suffix.begin(), Suffix.end());
1997 return OutContext.GetOrCreateSymbol(NameStr.str());
2000 /// GetExternalSymbolSymbol - Return the MCSymbol for the specified
2002 MCSymbol *AsmPrinter::GetExternalSymbolSymbol(StringRef Sym) const {
2003 SmallString<60> NameStr;
2004 Mang->getNameWithPrefix(NameStr, Sym);
2005 return OutContext.GetOrCreateSymbol(NameStr.str());
2010 /// PrintParentLoopComment - Print comments about parent loops of this one.
2011 static void PrintParentLoopComment(raw_ostream &OS, const MachineLoop *Loop,
2012 unsigned FunctionNumber) {
2013 if (Loop == 0) return;
2014 PrintParentLoopComment(OS, Loop->getParentLoop(), FunctionNumber);
2015 OS.indent(Loop->getLoopDepth()*2)
2016 << "Parent Loop BB" << FunctionNumber << "_"
2017 << Loop->getHeader()->getNumber()
2018 << " Depth=" << Loop->getLoopDepth() << '\n';
2022 /// PrintChildLoopComment - Print comments about child loops within
2023 /// the loop for this basic block, with nesting.
2024 static void PrintChildLoopComment(raw_ostream &OS, const MachineLoop *Loop,
2025 unsigned FunctionNumber) {
2026 // Add child loop information
2027 for (MachineLoop::iterator CL = Loop->begin(), E = Loop->end();CL != E; ++CL){
2028 OS.indent((*CL)->getLoopDepth()*2)
2029 << "Child Loop BB" << FunctionNumber << "_"
2030 << (*CL)->getHeader()->getNumber() << " Depth " << (*CL)->getLoopDepth()
2032 PrintChildLoopComment(OS, *CL, FunctionNumber);
2036 /// EmitBasicBlockLoopComments - Pretty-print comments for basic blocks.
2037 static void EmitBasicBlockLoopComments(const MachineBasicBlock &MBB,
2038 const MachineLoopInfo *LI,
2039 const AsmPrinter &AP) {
2040 // Add loop depth information
2041 const MachineLoop *Loop = LI->getLoopFor(&MBB);
2042 if (Loop == 0) return;
2044 MachineBasicBlock *Header = Loop->getHeader();
2045 assert(Header && "No header for loop");
2047 // If this block is not a loop header, just print out what is the loop header
2049 if (Header != &MBB) {
2050 AP.OutStreamer.AddComment(" in Loop: Header=BB" +
2051 Twine(AP.getFunctionNumber())+"_" +
2052 Twine(Loop->getHeader()->getNumber())+
2053 " Depth="+Twine(Loop->getLoopDepth()));
2057 // Otherwise, it is a loop header. Print out information about child and
2059 raw_ostream &OS = AP.OutStreamer.GetCommentOS();
2061 PrintParentLoopComment(OS, Loop->getParentLoop(), AP.getFunctionNumber());
2064 OS.indent(Loop->getLoopDepth()*2-2);
2069 OS << "Loop Header: Depth=" + Twine(Loop->getLoopDepth()) << '\n';
2071 PrintChildLoopComment(OS, Loop, AP.getFunctionNumber());
2075 /// EmitBasicBlockStart - This method prints the label for the specified
2076 /// MachineBasicBlock, an alignment (if present) and a comment describing
2077 /// it if appropriate.
2078 void AsmPrinter::EmitBasicBlockStart(const MachineBasicBlock *MBB) const {
2079 // Emit an alignment directive for this block, if needed.
2080 if (unsigned Align = MBB->getAlignment())
2081 EmitAlignment(Align);
2083 // If the block has its address taken, emit any labels that were used to
2084 // reference the block. It is possible that there is more than one label
2085 // here, because multiple LLVM BB's may have been RAUW'd to this block after
2086 // the references were generated.
2087 if (MBB->hasAddressTaken()) {
2088 const BasicBlock *BB = MBB->getBasicBlock();
2090 OutStreamer.AddComment("Block address taken");
2092 std::vector<MCSymbol*> Syms = MMI->getAddrLabelSymbolToEmit(BB);
2094 for (unsigned i = 0, e = Syms.size(); i != e; ++i)
2095 OutStreamer.EmitLabel(Syms[i]);
2098 // Print some verbose block comments.
2100 if (const BasicBlock *BB = MBB->getBasicBlock())
2102 OutStreamer.AddComment("%" + BB->getName());
2103 EmitBasicBlockLoopComments(*MBB, LI, *this);
2106 // Print the main label for the block.
2107 if (MBB->pred_empty() || isBlockOnlyReachableByFallthrough(MBB)) {
2108 if (isVerbose() && OutStreamer.hasRawTextSupport()) {
2109 // NOTE: Want this comment at start of line, don't emit with AddComment.
2110 OutStreamer.EmitRawText(Twine(MAI->getCommentString()) + " BB#" +
2111 Twine(MBB->getNumber()) + ":");
2114 OutStreamer.EmitLabel(MBB->getSymbol());
2118 void AsmPrinter::EmitVisibility(MCSymbol *Sym, unsigned Visibility,
2119 bool IsDefinition) const {
2120 MCSymbolAttr Attr = MCSA_Invalid;
2122 switch (Visibility) {
2124 case GlobalValue::HiddenVisibility:
2126 Attr = MAI->getHiddenVisibilityAttr();
2128 Attr = MAI->getHiddenDeclarationVisibilityAttr();
2130 case GlobalValue::ProtectedVisibility:
2131 Attr = MAI->getProtectedVisibilityAttr();
2135 if (Attr != MCSA_Invalid)
2136 OutStreamer.EmitSymbolAttribute(Sym, Attr);
2139 /// isBlockOnlyReachableByFallthough - Return true if the basic block has
2140 /// exactly one predecessor and the control transfer mechanism between
2141 /// the predecessor and this block is a fall-through.
2143 isBlockOnlyReachableByFallthrough(const MachineBasicBlock *MBB) const {
2144 // If this is a landing pad, it isn't a fall through. If it has no preds,
2145 // then nothing falls through to it.
2146 if (MBB->isLandingPad() || MBB->pred_empty())
2149 // If there isn't exactly one predecessor, it can't be a fall through.
2150 MachineBasicBlock::const_pred_iterator PI = MBB->pred_begin(), PI2 = PI;
2152 if (PI2 != MBB->pred_end())
2155 // The predecessor has to be immediately before this block.
2156 MachineBasicBlock *Pred = *PI;
2158 if (!Pred->isLayoutSuccessor(MBB))
2161 // If the block is completely empty, then it definitely does fall through.
2165 // Check the terminators in the previous blocks
2166 for (MachineBasicBlock::iterator II = Pred->getFirstTerminator(),
2167 IE = Pred->end(); II != IE; ++II) {
2168 MachineInstr &MI = *II;
2170 // If it is not a simple branch, we are in a table somewhere.
2171 if (!MI.isBranch() || MI.isIndirectBranch())
2174 // If we are the operands of one of the branches, this is not
2176 for (MachineInstr::mop_iterator OI = MI.operands_begin(),
2177 OE = MI.operands_end(); OI != OE; ++OI) {
2178 const MachineOperand& OP = *OI;
2181 if (OP.isMBB() && OP.getMBB() == MBB)
2191 GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy *S) {
2192 if (!S->usesMetadata())
2195 gcp_map_type &GCMap = getGCMap(GCMetadataPrinters);
2196 gcp_map_type::iterator GCPI = GCMap.find(S);
2197 if (GCPI != GCMap.end())
2198 return GCPI->second;
2200 const char *Name = S->getName().c_str();
2202 for (GCMetadataPrinterRegistry::iterator
2203 I = GCMetadataPrinterRegistry::begin(),
2204 E = GCMetadataPrinterRegistry::end(); I != E; ++I)
2205 if (strcmp(Name, I->getName()) == 0) {
2206 GCMetadataPrinter *GMP = I->instantiate();
2208 GCMap.insert(std::make_pair(S, GMP));
2212 report_fatal_error("no GCMetadataPrinter registered for GC: " + Twine(Name));