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/DebugInfo.h"
19 #include "llvm/Module.h"
20 #include "llvm/CodeGen/GCMetadataPrinter.h"
21 #include "llvm/CodeGen/MachineConstantPool.h"
22 #include "llvm/CodeGen/MachineFrameInfo.h"
23 #include "llvm/CodeGen/MachineFunction.h"
24 #include "llvm/CodeGen/MachineJumpTableInfo.h"
25 #include "llvm/CodeGen/MachineLoopInfo.h"
26 #include "llvm/CodeGen/MachineModuleInfo.h"
27 #include "llvm/Analysis/ConstantFolding.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/DataLayout.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 DataLayout &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())
93 AsmPrinter::AsmPrinter(TargetMachine &tm, MCStreamer &Streamer)
94 : MachineFunctionPass(ID),
95 TM(tm), MAI(tm.getMCAsmInfo()),
96 OutContext(Streamer.getContext()),
97 OutStreamer(Streamer),
98 LastMI(0), LastFn(0), Counter(~0U), SetCounter(0) {
99 DD = 0; DE = 0; MMI = 0; LI = 0;
100 CurrentFnSym = CurrentFnSymForSize = 0;
101 GCMetadataPrinters = 0;
102 VerboseAsm = Streamer.isVerboseAsm();
105 AsmPrinter::~AsmPrinter() {
106 assert(DD == 0 && DE == 0 && "Debug/EH info didn't get finalized");
108 if (GCMetadataPrinters != 0) {
109 gcp_map_type &GCMap = getGCMap(GCMetadataPrinters);
111 for (gcp_map_type::iterator I = GCMap.begin(), E = GCMap.end(); I != E; ++I)
114 GCMetadataPrinters = 0;
120 /// getFunctionNumber - Return a unique ID for the current function.
122 unsigned AsmPrinter::getFunctionNumber() const {
123 return MF->getFunctionNumber();
126 const TargetLoweringObjectFile &AsmPrinter::getObjFileLowering() const {
127 return TM.getTargetLowering()->getObjFileLowering();
130 /// getDataLayout - Return information about data layout.
131 const DataLayout &AsmPrinter::getDataLayout() const {
132 return *TM.getDataLayout();
135 /// getCurrentSection() - Return the current section we are emitting to.
136 const MCSection *AsmPrinter::getCurrentSection() const {
137 return OutStreamer.getCurrentSection();
142 void AsmPrinter::getAnalysisUsage(AnalysisUsage &AU) const {
143 AU.setPreservesAll();
144 MachineFunctionPass::getAnalysisUsage(AU);
145 AU.addRequired<MachineModuleInfo>();
146 AU.addRequired<GCModuleInfo>();
148 AU.addRequired<MachineLoopInfo>();
151 bool AsmPrinter::doInitialization(Module &M) {
152 MMI = getAnalysisIfAvailable<MachineModuleInfo>();
153 MMI->AnalyzeModule(M);
155 // Initialize TargetLoweringObjectFile.
156 const_cast<TargetLoweringObjectFile&>(getObjFileLowering())
157 .Initialize(OutContext, TM);
159 Mang = new Mangler(OutContext, *TM.getDataLayout());
161 // Allow the target to emit any magic that it wants at the start of the file.
162 EmitStartOfAsmFile(M);
164 // Very minimal debug info. It is ignored if we emit actual debug info. If we
165 // don't, this at least helps the user find where a global came from.
166 if (MAI->hasSingleParameterDotFile()) {
168 OutStreamer.EmitFileDirective(M.getModuleIdentifier());
171 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
172 assert(MI && "AsmPrinter didn't require GCModuleInfo?");
173 for (GCModuleInfo::iterator I = MI->begin(), E = MI->end(); I != E; ++I)
174 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I))
175 MP->beginAssembly(*this);
177 // Emit module-level inline asm if it exists.
178 if (!M.getModuleInlineAsm().empty()) {
179 OutStreamer.AddComment("Start of file scope inline assembly");
180 OutStreamer.AddBlankLine();
181 EmitInlineAsm(M.getModuleInlineAsm()+"\n");
182 OutStreamer.AddComment("End of file scope inline assembly");
183 OutStreamer.AddBlankLine();
186 if (MAI->doesSupportDebugInformation())
187 DD = new DwarfDebug(this, &M);
189 switch (MAI->getExceptionHandlingType()) {
190 case ExceptionHandling::None:
192 case ExceptionHandling::SjLj:
193 case ExceptionHandling::DwarfCFI:
194 DE = new DwarfCFIException(this);
196 case ExceptionHandling::ARM:
197 DE = new ARMException(this);
199 case ExceptionHandling::Win64:
200 DE = new Win64Exception(this);
204 llvm_unreachable("Unknown exception type.");
207 void AsmPrinter::EmitLinkage(unsigned Linkage, MCSymbol *GVSym) const {
208 switch ((GlobalValue::LinkageTypes)Linkage) {
209 case GlobalValue::CommonLinkage:
210 case GlobalValue::LinkOnceAnyLinkage:
211 case GlobalValue::LinkOnceODRLinkage:
212 case GlobalValue::LinkOnceODRAutoHideLinkage:
213 case GlobalValue::WeakAnyLinkage:
214 case GlobalValue::WeakODRLinkage:
215 case GlobalValue::LinkerPrivateWeakLinkage:
216 if (MAI->getWeakDefDirective() != 0) {
218 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
220 if ((GlobalValue::LinkageTypes)Linkage !=
221 GlobalValue::LinkOnceODRAutoHideLinkage)
222 // .weak_definition _foo
223 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_WeakDefinition);
225 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_WeakDefAutoPrivate);
226 } else if (MAI->getLinkOnceDirective() != 0) {
228 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
229 //NOTE: linkonce is handled by the section the symbol was assigned to.
232 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Weak);
235 case GlobalValue::DLLExportLinkage:
236 case GlobalValue::AppendingLinkage:
237 // FIXME: appending linkage variables should go into a section of
238 // their name or something. For now, just emit them as external.
239 case GlobalValue::ExternalLinkage:
240 // If external or appending, declare as a global symbol.
242 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
244 case GlobalValue::PrivateLinkage:
245 case GlobalValue::InternalLinkage:
246 case GlobalValue::LinkerPrivateLinkage:
249 llvm_unreachable("Unknown linkage type!");
254 /// EmitGlobalVariable - Emit the specified global variable to the .s file.
255 void AsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) {
256 if (GV->hasInitializer()) {
257 // Check to see if this is a special global used by LLVM, if so, emit it.
258 if (EmitSpecialLLVMGlobal(GV))
262 WriteAsOperand(OutStreamer.GetCommentOS(), GV,
263 /*PrintType=*/false, GV->getParent());
264 OutStreamer.GetCommentOS() << '\n';
268 MCSymbol *GVSym = Mang->getSymbol(GV);
269 EmitVisibility(GVSym, GV->getVisibility(), !GV->isDeclaration());
271 if (!GV->hasInitializer()) // External globals require no extra code.
274 if (MAI->hasDotTypeDotSizeDirective())
275 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_ELF_TypeObject);
277 SectionKind GVKind = TargetLoweringObjectFile::getKindForGlobal(GV, TM);
279 const DataLayout *TD = TM.getDataLayout();
280 uint64_t Size = TD->getTypeAllocSize(GV->getType()->getElementType());
282 // If the alignment is specified, we *must* obey it. Overaligning a global
283 // with a specified alignment is a prompt way to break globals emitted to
284 // sections and expected to be contiguous (e.g. ObjC metadata).
285 unsigned AlignLog = getGVAlignmentLog2(GV, *TD);
287 // Handle common and BSS local symbols (.lcomm).
288 if (GVKind.isCommon() || GVKind.isBSSLocal()) {
289 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
290 unsigned Align = 1 << AlignLog;
292 // Handle common symbols.
293 if (GVKind.isCommon()) {
294 if (!getObjFileLowering().getCommDirectiveSupportsAlignment())
298 OutStreamer.EmitCommonSymbol(GVSym, Size, Align);
302 // Handle local BSS symbols.
303 if (MAI->hasMachoZeroFillDirective()) {
304 const MCSection *TheSection =
305 getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM);
306 // .zerofill __DATA, __bss, _foo, 400, 5
307 OutStreamer.EmitZerofill(TheSection, GVSym, Size, Align);
311 // Use .lcomm only if it supports user-specified alignment.
312 // Otherwise, while it would still be correct to use .lcomm in some
313 // cases (e.g. when Align == 1), the external assembler might enfore
314 // some -unknown- default alignment behavior, which could cause
315 // spurious differences between external and integrated assembler.
316 // Prefer to simply fall back to .local / .comm in this case.
317 if (MAI->getLCOMMDirectiveAlignmentType() != LCOMM::NoAlignment) {
319 OutStreamer.EmitLocalCommonSymbol(GVSym, Size, Align);
323 if (!getObjFileLowering().getCommDirectiveSupportsAlignment())
327 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Local);
329 OutStreamer.EmitCommonSymbol(GVSym, Size, Align);
333 const MCSection *TheSection =
334 getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM);
336 // Handle the zerofill directive on darwin, which is a special form of BSS
338 if (GVKind.isBSSExtern() && MAI->hasMachoZeroFillDirective()) {
339 if (Size == 0) Size = 1; // zerofill of 0 bytes is undefined.
342 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
343 // .zerofill __DATA, __common, _foo, 400, 5
344 OutStreamer.EmitZerofill(TheSection, GVSym, Size, 1 << AlignLog);
348 // Handle thread local data for mach-o which requires us to output an
349 // additional structure of data and mangle the original symbol so that we
350 // can reference it later.
352 // TODO: This should become an "emit thread local global" method on TLOF.
353 // All of this macho specific stuff should be sunk down into TLOFMachO and
354 // stuff like "TLSExtraDataSection" should no longer be part of the parent
355 // TLOF class. This will also make it more obvious that stuff like
356 // MCStreamer::EmitTBSSSymbol is macho specific and only called from macho
358 if (GVKind.isThreadLocal() && MAI->hasMachoTBSSDirective()) {
359 // Emit the .tbss symbol
361 OutContext.GetOrCreateSymbol(GVSym->getName() + Twine("$tlv$init"));
363 if (GVKind.isThreadBSS())
364 OutStreamer.EmitTBSSSymbol(TheSection, MangSym, Size, 1 << AlignLog);
365 else if (GVKind.isThreadData()) {
366 OutStreamer.SwitchSection(TheSection);
368 EmitAlignment(AlignLog, GV);
369 OutStreamer.EmitLabel(MangSym);
371 EmitGlobalConstant(GV->getInitializer());
374 OutStreamer.AddBlankLine();
376 // Emit the variable struct for the runtime.
377 const MCSection *TLVSect
378 = getObjFileLowering().getTLSExtraDataSection();
380 OutStreamer.SwitchSection(TLVSect);
381 // Emit the linkage here.
382 EmitLinkage(GV->getLinkage(), GVSym);
383 OutStreamer.EmitLabel(GVSym);
385 // Three pointers in size:
386 // - __tlv_bootstrap - used to make sure support exists
387 // - spare pointer, used when mapped by the runtime
388 // - pointer to mangled symbol above with initializer
389 unsigned PtrSize = TD->getPointerSizeInBits()/8;
390 OutStreamer.EmitSymbolValue(GetExternalSymbolSymbol("_tlv_bootstrap"),
392 OutStreamer.EmitIntValue(0, PtrSize, 0);
393 OutStreamer.EmitSymbolValue(MangSym, PtrSize, 0);
395 OutStreamer.AddBlankLine();
399 OutStreamer.SwitchSection(TheSection);
401 EmitLinkage(GV->getLinkage(), GVSym);
402 EmitAlignment(AlignLog, GV);
404 OutStreamer.EmitLabel(GVSym);
406 EmitGlobalConstant(GV->getInitializer());
408 if (MAI->hasDotTypeDotSizeDirective())
410 OutStreamer.EmitELFSize(GVSym, MCConstantExpr::Create(Size, OutContext));
412 OutStreamer.AddBlankLine();
415 /// EmitFunctionHeader - This method emits the header for the current
417 void AsmPrinter::EmitFunctionHeader() {
418 // Print out constants referenced by the function
421 // Print the 'header' of function.
422 const Function *F = MF->getFunction();
424 OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang, TM));
425 EmitVisibility(CurrentFnSym, F->getVisibility());
427 EmitLinkage(F->getLinkage(), CurrentFnSym);
428 EmitAlignment(MF->getAlignment(), F);
430 if (MAI->hasDotTypeDotSizeDirective())
431 OutStreamer.EmitSymbolAttribute(CurrentFnSym, MCSA_ELF_TypeFunction);
434 WriteAsOperand(OutStreamer.GetCommentOS(), F,
435 /*PrintType=*/false, F->getParent());
436 OutStreamer.GetCommentOS() << '\n';
439 // Emit the CurrentFnSym. This is a virtual function to allow targets to
440 // do their wild and crazy things as required.
441 EmitFunctionEntryLabel();
443 // If the function had address-taken blocks that got deleted, then we have
444 // references to the dangling symbols. Emit them at the start of the function
445 // so that we don't get references to undefined symbols.
446 std::vector<MCSymbol*> DeadBlockSyms;
447 MMI->takeDeletedSymbolsForFunction(F, DeadBlockSyms);
448 for (unsigned i = 0, e = DeadBlockSyms.size(); i != e; ++i) {
449 OutStreamer.AddComment("Address taken block that was later removed");
450 OutStreamer.EmitLabel(DeadBlockSyms[i]);
453 // Add some workaround for linkonce linkage on Cygwin\MinGW.
454 if (MAI->getLinkOnceDirective() != 0 &&
455 (F->hasLinkOnceLinkage() || F->hasWeakLinkage())) {
456 // FIXME: What is this?
458 OutContext.GetOrCreateSymbol(Twine("Lllvm$workaround$fake$stub$")+
459 CurrentFnSym->getName());
460 OutStreamer.EmitLabel(FakeStub);
463 // Emit pre-function debug and/or EH information.
465 NamedRegionTimer T(EHTimerName, DWARFGroupName, TimePassesIsEnabled);
466 DE->BeginFunction(MF);
469 NamedRegionTimer T(DbgTimerName, DWARFGroupName, TimePassesIsEnabled);
470 DD->beginFunction(MF);
474 /// EmitFunctionEntryLabel - Emit the label that is the entrypoint for the
475 /// function. This can be overridden by targets as required to do custom stuff.
476 void AsmPrinter::EmitFunctionEntryLabel() {
477 // The function label could have already been emitted if two symbols end up
478 // conflicting due to asm renaming. Detect this and emit an error.
479 if (CurrentFnSym->isUndefined())
480 return OutStreamer.EmitLabel(CurrentFnSym);
482 report_fatal_error("'" + Twine(CurrentFnSym->getName()) +
483 "' label emitted multiple times to assembly file");
486 /// emitComments - Pretty-print comments for instructions.
487 static void emitComments(const MachineInstr &MI, raw_ostream &CommentOS) {
488 const MachineFunction *MF = MI.getParent()->getParent();
489 const TargetMachine &TM = MF->getTarget();
491 // Check for spills and reloads
494 const MachineFrameInfo *FrameInfo = MF->getFrameInfo();
496 // We assume a single instruction only has a spill or reload, not
498 const MachineMemOperand *MMO;
499 if (TM.getInstrInfo()->isLoadFromStackSlotPostFE(&MI, FI)) {
500 if (FrameInfo->isSpillSlotObjectIndex(FI)) {
501 MMO = *MI.memoperands_begin();
502 CommentOS << MMO->getSize() << "-byte Reload\n";
504 } else if (TM.getInstrInfo()->hasLoadFromStackSlot(&MI, MMO, FI)) {
505 if (FrameInfo->isSpillSlotObjectIndex(FI))
506 CommentOS << MMO->getSize() << "-byte Folded Reload\n";
507 } else if (TM.getInstrInfo()->isStoreToStackSlotPostFE(&MI, FI)) {
508 if (FrameInfo->isSpillSlotObjectIndex(FI)) {
509 MMO = *MI.memoperands_begin();
510 CommentOS << MMO->getSize() << "-byte Spill\n";
512 } else if (TM.getInstrInfo()->hasStoreToStackSlot(&MI, MMO, FI)) {
513 if (FrameInfo->isSpillSlotObjectIndex(FI))
514 CommentOS << MMO->getSize() << "-byte Folded Spill\n";
517 // Check for spill-induced copies
518 if (MI.getAsmPrinterFlag(MachineInstr::ReloadReuse))
519 CommentOS << " Reload Reuse\n";
522 /// emitImplicitDef - This method emits the specified machine instruction
523 /// that is an implicit def.
524 static void emitImplicitDef(const MachineInstr *MI, AsmPrinter &AP) {
525 unsigned RegNo = MI->getOperand(0).getReg();
526 AP.OutStreamer.AddComment(Twine("implicit-def: ") +
527 AP.TM.getRegisterInfo()->getName(RegNo));
528 AP.OutStreamer.AddBlankLine();
531 static void emitKill(const MachineInstr *MI, AsmPrinter &AP) {
532 std::string Str = "kill:";
533 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
534 const MachineOperand &Op = MI->getOperand(i);
535 assert(Op.isReg() && "KILL instruction must have only register operands");
537 Str += AP.TM.getRegisterInfo()->getName(Op.getReg());
538 Str += (Op.isDef() ? "<def>" : "<kill>");
540 AP.OutStreamer.AddComment(Str);
541 AP.OutStreamer.AddBlankLine();
544 /// emitDebugValueComment - This method handles the target-independent form
545 /// of DBG_VALUE, returning true if it was able to do so. A false return
546 /// means the target will need to handle MI in EmitInstruction.
547 static bool emitDebugValueComment(const MachineInstr *MI, AsmPrinter &AP) {
548 // This code handles only the 3-operand target-independent form.
549 if (MI->getNumOperands() != 3)
552 SmallString<128> Str;
553 raw_svector_ostream OS(Str);
554 OS << '\t' << AP.MAI->getCommentString() << "DEBUG_VALUE: ";
556 // cast away const; DIetc do not take const operands for some reason.
557 DIVariable V(const_cast<MDNode*>(MI->getOperand(2).getMetadata()));
558 if (V.getContext().isSubprogram())
559 OS << DISubprogram(V.getContext()).getDisplayName() << ":";
560 OS << V.getName() << " <- ";
562 // Register or immediate value. Register 0 means undef.
563 if (MI->getOperand(0).isFPImm()) {
564 APFloat APF = APFloat(MI->getOperand(0).getFPImm()->getValueAPF());
565 if (MI->getOperand(0).getFPImm()->getType()->isFloatTy()) {
566 OS << (double)APF.convertToFloat();
567 } else if (MI->getOperand(0).getFPImm()->getType()->isDoubleTy()) {
568 OS << APF.convertToDouble();
570 // There is no good way to print long double. Convert a copy to
571 // double. Ah well, it's only a comment.
573 APF.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven,
575 OS << "(long double) " << APF.convertToDouble();
577 } else if (MI->getOperand(0).isImm()) {
578 OS << MI->getOperand(0).getImm();
579 } else if (MI->getOperand(0).isCImm()) {
580 MI->getOperand(0).getCImm()->getValue().print(OS, false /*isSigned*/);
582 assert(MI->getOperand(0).isReg() && "Unknown operand type");
583 if (MI->getOperand(0).getReg() == 0) {
584 // Suppress offset, it is not meaningful here.
586 // NOTE: Want this comment at start of line, don't emit with AddComment.
587 AP.OutStreamer.EmitRawText(OS.str());
590 OS << AP.TM.getRegisterInfo()->getName(MI->getOperand(0).getReg());
593 OS << '+' << MI->getOperand(1).getImm();
594 // NOTE: Want this comment at start of line, don't emit with AddComment.
595 AP.OutStreamer.EmitRawText(OS.str());
599 AsmPrinter::CFIMoveType AsmPrinter::needsCFIMoves() {
600 if (MAI->getExceptionHandlingType() == ExceptionHandling::DwarfCFI &&
601 MF->getFunction()->needsUnwindTableEntry())
604 if (MMI->hasDebugInfo())
610 bool AsmPrinter::needsSEHMoves() {
611 return MAI->getExceptionHandlingType() == ExceptionHandling::Win64 &&
612 MF->getFunction()->needsUnwindTableEntry();
615 bool AsmPrinter::needsRelocationsForDwarfStringPool() const {
616 return MAI->doesDwarfUseRelocationsAcrossSections();
619 void AsmPrinter::emitPrologLabel(const MachineInstr &MI) {
620 MCSymbol *Label = MI.getOperand(0).getMCSymbol();
622 if (MAI->getExceptionHandlingType() != ExceptionHandling::DwarfCFI)
625 if (needsCFIMoves() == CFI_M_None)
628 if (MMI->getCompactUnwindEncoding() != 0)
629 OutStreamer.EmitCompactUnwindEncoding(MMI->getCompactUnwindEncoding());
631 MachineModuleInfo &MMI = MF->getMMI();
632 std::vector<MachineMove> &Moves = MMI.getFrameMoves();
633 bool FoundOne = false;
635 for (std::vector<MachineMove>::iterator I = Moves.begin(),
636 E = Moves.end(); I != E; ++I) {
637 if (I->getLabel() == Label) {
638 EmitCFIFrameMove(*I);
645 /// EmitFunctionBody - This method emits the body and trailer for a
647 void AsmPrinter::EmitFunctionBody() {
648 // Emit target-specific gunk before the function body.
649 EmitFunctionBodyStart();
651 bool ShouldPrintDebugScopes = DD && MMI->hasDebugInfo();
653 // Print out code for the function.
654 bool HasAnyRealCode = false;
655 const MachineInstr *LastMI = 0;
656 for (MachineFunction::const_iterator I = MF->begin(), E = MF->end();
658 // Print a label for the basic block.
659 EmitBasicBlockStart(I);
660 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
664 // Print the assembly for the instruction.
665 if (!II->isLabel() && !II->isImplicitDef() && !II->isKill() &&
666 !II->isDebugValue()) {
667 HasAnyRealCode = true;
671 if (ShouldPrintDebugScopes) {
672 NamedRegionTimer T(DbgTimerName, DWARFGroupName, TimePassesIsEnabled);
673 DD->beginInstruction(II);
677 emitComments(*II, OutStreamer.GetCommentOS());
679 switch (II->getOpcode()) {
680 case TargetOpcode::PROLOG_LABEL:
681 emitPrologLabel(*II);
684 case TargetOpcode::EH_LABEL:
685 case TargetOpcode::GC_LABEL:
686 OutStreamer.EmitLabel(II->getOperand(0).getMCSymbol());
688 case TargetOpcode::INLINEASM:
691 case TargetOpcode::DBG_VALUE:
693 if (!emitDebugValueComment(II, *this))
697 case TargetOpcode::IMPLICIT_DEF:
698 if (isVerbose()) emitImplicitDef(II, *this);
700 case TargetOpcode::KILL:
701 if (isVerbose()) emitKill(II, *this);
704 if (!TM.hasMCUseLoc())
705 MCLineEntry::Make(&OutStreamer, getCurrentSection());
711 if (ShouldPrintDebugScopes) {
712 NamedRegionTimer T(DbgTimerName, DWARFGroupName, TimePassesIsEnabled);
713 DD->endInstruction(II);
718 // If the last instruction was a prolog label, then we have a situation where
719 // we emitted a prolog but no function body. This results in the ending prolog
720 // label equaling the end of function label and an invalid "row" in the
721 // FDE. We need to emit a noop in this situation so that the FDE's rows are
723 bool RequiresNoop = LastMI && LastMI->isPrologLabel();
725 // If the function is empty and the object file uses .subsections_via_symbols,
726 // then we need to emit *something* to the function body to prevent the
727 // labels from collapsing together. Just emit a noop.
728 if ((MAI->hasSubsectionsViaSymbols() && !HasAnyRealCode) || RequiresNoop) {
730 TM.getInstrInfo()->getNoopForMachoTarget(Noop);
731 if (Noop.getOpcode()) {
732 OutStreamer.AddComment("avoids zero-length function");
733 OutStreamer.EmitInstruction(Noop);
734 } else // Target not mc-ized yet.
735 OutStreamer.EmitRawText(StringRef("\tnop\n"));
738 const Function *F = MF->getFunction();
739 for (Function::const_iterator i = F->begin(), e = F->end(); i != e; ++i) {
740 const BasicBlock *BB = i;
741 if (!BB->hasAddressTaken())
743 MCSymbol *Sym = GetBlockAddressSymbol(BB);
744 if (Sym->isDefined())
746 OutStreamer.AddComment("Address of block that was removed by CodeGen");
747 OutStreamer.EmitLabel(Sym);
750 // Emit target-specific gunk after the function body.
751 EmitFunctionBodyEnd();
753 // If the target wants a .size directive for the size of the function, emit
755 if (MAI->hasDotTypeDotSizeDirective()) {
756 // Create a symbol for the end of function, so we can get the size as
757 // difference between the function label and the temp label.
758 MCSymbol *FnEndLabel = OutContext.CreateTempSymbol();
759 OutStreamer.EmitLabel(FnEndLabel);
761 const MCExpr *SizeExp =
762 MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(FnEndLabel, OutContext),
763 MCSymbolRefExpr::Create(CurrentFnSymForSize,
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 (MCSuperRegIterator SR(MLoc.getReg(), TRI); SR.isValid() && Reg < 0;
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 // Emit module flags.
861 SmallVector<Module::ModuleFlagEntry, 8> ModuleFlags;
862 M.getModuleFlagsMetadata(ModuleFlags);
863 if (!ModuleFlags.empty())
864 getObjFileLowering().emitModuleFlags(OutStreamer, ModuleFlags, Mang, TM);
866 // Finalize debug and EH information.
869 NamedRegionTimer T(EHTimerName, DWARFGroupName, TimePassesIsEnabled);
876 NamedRegionTimer T(DbgTimerName, DWARFGroupName, TimePassesIsEnabled);
882 // If the target wants to know about weak references, print them all.
883 if (MAI->getWeakRefDirective()) {
884 // FIXME: This is not lazy, it would be nice to only print weak references
885 // to stuff that is actually used. Note that doing so would require targets
886 // to notice uses in operands (due to constant exprs etc). This should
887 // happen with the MC stuff eventually.
889 // Print out module-level global variables here.
890 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
892 if (!I->hasExternalWeakLinkage()) continue;
893 OutStreamer.EmitSymbolAttribute(Mang->getSymbol(I), MCSA_WeakReference);
896 for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I) {
897 if (!I->hasExternalWeakLinkage()) continue;
898 OutStreamer.EmitSymbolAttribute(Mang->getSymbol(I), MCSA_WeakReference);
902 if (MAI->hasSetDirective()) {
903 OutStreamer.AddBlankLine();
904 for (Module::const_alias_iterator I = M.alias_begin(), E = M.alias_end();
906 MCSymbol *Name = Mang->getSymbol(I);
908 const GlobalValue *GV = I->getAliasedGlobal();
909 MCSymbol *Target = Mang->getSymbol(GV);
911 if (I->hasExternalLinkage() || !MAI->getWeakRefDirective())
912 OutStreamer.EmitSymbolAttribute(Name, MCSA_Global);
913 else if (I->hasWeakLinkage())
914 OutStreamer.EmitSymbolAttribute(Name, MCSA_WeakReference);
916 assert(I->hasLocalLinkage() && "Invalid alias linkage");
918 EmitVisibility(Name, I->getVisibility());
920 // Emit the directives as assignments aka .set:
921 OutStreamer.EmitAssignment(Name,
922 MCSymbolRefExpr::Create(Target, OutContext));
926 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
927 assert(MI && "AsmPrinter didn't require GCModuleInfo?");
928 for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; )
929 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*--I))
930 MP->finishAssembly(*this);
932 // If we don't have any trampolines, then we don't require stack memory
933 // to be executable. Some targets have a directive to declare this.
934 Function *InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline");
935 if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty())
936 if (const MCSection *S = MAI->getNonexecutableStackSection(OutContext))
937 OutStreamer.SwitchSection(S);
939 // Allow the target to emit any magic that it wants at the end of the file,
940 // after everything else has gone out.
943 delete Mang; Mang = 0;
946 OutStreamer.Finish();
950 void AsmPrinter::SetupMachineFunction(MachineFunction &MF) {
952 // Get the function symbol.
953 CurrentFnSym = Mang->getSymbol(MF.getFunction());
954 CurrentFnSymForSize = CurrentFnSym;
957 LI = &getAnalysis<MachineLoopInfo>();
961 // SectionCPs - Keep track the alignment, constpool entries per Section.
965 SmallVector<unsigned, 4> CPEs;
966 SectionCPs(const MCSection *s, unsigned a) : S(s), Alignment(a) {}
970 /// EmitConstantPool - Print to the current output stream assembly
971 /// representations of the constants in the constant pool MCP. This is
972 /// used to print out constants which have been "spilled to memory" by
973 /// the code generator.
975 void AsmPrinter::EmitConstantPool() {
976 const MachineConstantPool *MCP = MF->getConstantPool();
977 const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
978 if (CP.empty()) return;
980 // Calculate sections for constant pool entries. We collect entries to go into
981 // the same section together to reduce amount of section switch statements.
982 SmallVector<SectionCPs, 4> CPSections;
983 for (unsigned i = 0, e = CP.size(); i != e; ++i) {
984 const MachineConstantPoolEntry &CPE = CP[i];
985 unsigned Align = CPE.getAlignment();
988 switch (CPE.getRelocationInfo()) {
989 default: llvm_unreachable("Unknown section kind");
990 case 2: Kind = SectionKind::getReadOnlyWithRel(); break;
992 Kind = SectionKind::getReadOnlyWithRelLocal();
995 switch (TM.getDataLayout()->getTypeAllocSize(CPE.getType())) {
996 case 4: Kind = SectionKind::getMergeableConst4(); break;
997 case 8: Kind = SectionKind::getMergeableConst8(); break;
998 case 16: Kind = SectionKind::getMergeableConst16();break;
999 default: Kind = SectionKind::getMergeableConst(); break;
1003 const MCSection *S = getObjFileLowering().getSectionForConstant(Kind);
1005 // The number of sections are small, just do a linear search from the
1006 // last section to the first.
1008 unsigned SecIdx = CPSections.size();
1009 while (SecIdx != 0) {
1010 if (CPSections[--SecIdx].S == S) {
1016 SecIdx = CPSections.size();
1017 CPSections.push_back(SectionCPs(S, Align));
1020 if (Align > CPSections[SecIdx].Alignment)
1021 CPSections[SecIdx].Alignment = Align;
1022 CPSections[SecIdx].CPEs.push_back(i);
1025 // Now print stuff into the calculated sections.
1026 for (unsigned i = 0, e = CPSections.size(); i != e; ++i) {
1027 OutStreamer.SwitchSection(CPSections[i].S);
1028 EmitAlignment(Log2_32(CPSections[i].Alignment));
1030 unsigned Offset = 0;
1031 for (unsigned j = 0, ee = CPSections[i].CPEs.size(); j != ee; ++j) {
1032 unsigned CPI = CPSections[i].CPEs[j];
1033 MachineConstantPoolEntry CPE = CP[CPI];
1035 // Emit inter-object padding for alignment.
1036 unsigned AlignMask = CPE.getAlignment() - 1;
1037 unsigned NewOffset = (Offset + AlignMask) & ~AlignMask;
1038 OutStreamer.EmitFill(NewOffset - Offset, 0/*fillval*/, 0/*addrspace*/);
1040 Type *Ty = CPE.getType();
1041 Offset = NewOffset + TM.getDataLayout()->getTypeAllocSize(Ty);
1042 OutStreamer.EmitLabel(GetCPISymbol(CPI));
1044 if (CPE.isMachineConstantPoolEntry())
1045 EmitMachineConstantPoolValue(CPE.Val.MachineCPVal);
1047 EmitGlobalConstant(CPE.Val.ConstVal);
1052 /// EmitJumpTableInfo - Print assembly representations of the jump tables used
1053 /// by the current function to the current output stream.
1055 void AsmPrinter::EmitJumpTableInfo() {
1056 const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo();
1057 if (MJTI == 0) return;
1058 if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_Inline) return;
1059 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
1060 if (JT.empty()) return;
1062 // Pick the directive to use to print the jump table entries, and switch to
1063 // the appropriate section.
1064 const Function *F = MF->getFunction();
1065 bool JTInDiffSection = false;
1066 if (// In PIC mode, we need to emit the jump table to the same section as the
1067 // function body itself, otherwise the label differences won't make sense.
1068 // FIXME: Need a better predicate for this: what about custom entries?
1069 MJTI->getEntryKind() == MachineJumpTableInfo::EK_LabelDifference32 ||
1070 // We should also do if the section name is NULL or function is declared
1071 // in discardable section
1072 // FIXME: this isn't the right predicate, should be based on the MCSection
1073 // for the function.
1074 F->isWeakForLinker()) {
1075 OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F,Mang,TM));
1077 // Otherwise, drop it in the readonly section.
1078 const MCSection *ReadOnlySection =
1079 getObjFileLowering().getSectionForConstant(SectionKind::getReadOnly());
1080 OutStreamer.SwitchSection(ReadOnlySection);
1081 JTInDiffSection = true;
1084 EmitAlignment(Log2_32(MJTI->getEntryAlignment(*TM.getDataLayout())));
1086 // Jump tables in code sections are marked with a data_region directive
1087 // where that's supported.
1088 if (!JTInDiffSection)
1089 OutStreamer.EmitDataRegion(MCDR_DataRegionJT32);
1091 for (unsigned JTI = 0, e = JT.size(); JTI != e; ++JTI) {
1092 const std::vector<MachineBasicBlock*> &JTBBs = JT[JTI].MBBs;
1094 // If this jump table was deleted, ignore it.
1095 if (JTBBs.empty()) continue;
1097 // For the EK_LabelDifference32 entry, if the target supports .set, emit a
1098 // .set directive for each unique entry. This reduces the number of
1099 // relocations the assembler will generate for the jump table.
1100 if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_LabelDifference32 &&
1101 MAI->hasSetDirective()) {
1102 SmallPtrSet<const MachineBasicBlock*, 16> EmittedSets;
1103 const TargetLowering *TLI = TM.getTargetLowering();
1104 const MCExpr *Base = TLI->getPICJumpTableRelocBaseExpr(MF,JTI,OutContext);
1105 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
1106 const MachineBasicBlock *MBB = JTBBs[ii];
1107 if (!EmittedSets.insert(MBB)) continue;
1109 // .set LJTSet, LBB32-base
1111 MCSymbolRefExpr::Create(MBB->getSymbol(), OutContext);
1112 OutStreamer.EmitAssignment(GetJTSetSymbol(JTI, MBB->getNumber()),
1113 MCBinaryExpr::CreateSub(LHS, Base, OutContext));
1117 // On some targets (e.g. Darwin) we want to emit two consecutive labels
1118 // before each jump table. The first label is never referenced, but tells
1119 // the assembler and linker the extents of the jump table object. The
1120 // second label is actually referenced by the code.
1121 if (JTInDiffSection && MAI->getLinkerPrivateGlobalPrefix()[0])
1122 // FIXME: This doesn't have to have any specific name, just any randomly
1123 // named and numbered 'l' label would work. Simplify GetJTISymbol.
1124 OutStreamer.EmitLabel(GetJTISymbol(JTI, true));
1126 OutStreamer.EmitLabel(GetJTISymbol(JTI));
1128 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
1129 EmitJumpTableEntry(MJTI, JTBBs[ii], JTI);
1131 if (!JTInDiffSection)
1132 OutStreamer.EmitDataRegion(MCDR_DataRegionEnd);
1135 /// EmitJumpTableEntry - Emit a jump table entry for the specified MBB to the
1137 void AsmPrinter::EmitJumpTableEntry(const MachineJumpTableInfo *MJTI,
1138 const MachineBasicBlock *MBB,
1139 unsigned UID) const {
1140 assert(MBB && MBB->getNumber() >= 0 && "Invalid basic block");
1141 const MCExpr *Value = 0;
1142 switch (MJTI->getEntryKind()) {
1143 case MachineJumpTableInfo::EK_Inline:
1144 llvm_unreachable("Cannot emit EK_Inline jump table entry");
1145 case MachineJumpTableInfo::EK_Custom32:
1146 Value = TM.getTargetLowering()->LowerCustomJumpTableEntry(MJTI, MBB, UID,
1149 case MachineJumpTableInfo::EK_BlockAddress:
1150 // EK_BlockAddress - Each entry is a plain address of block, e.g.:
1152 Value = MCSymbolRefExpr::Create(MBB->getSymbol(), OutContext);
1154 case MachineJumpTableInfo::EK_GPRel32BlockAddress: {
1155 // EK_GPRel32BlockAddress - Each entry is an address of block, encoded
1156 // with a relocation as gp-relative, e.g.:
1158 MCSymbol *MBBSym = MBB->getSymbol();
1159 OutStreamer.EmitGPRel32Value(MCSymbolRefExpr::Create(MBBSym, OutContext));
1163 case MachineJumpTableInfo::EK_GPRel64BlockAddress: {
1164 // EK_GPRel64BlockAddress - Each entry is an address of block, encoded
1165 // with a relocation as gp-relative, e.g.:
1167 MCSymbol *MBBSym = MBB->getSymbol();
1168 OutStreamer.EmitGPRel64Value(MCSymbolRefExpr::Create(MBBSym, OutContext));
1172 case MachineJumpTableInfo::EK_LabelDifference32: {
1173 // EK_LabelDifference32 - Each entry is the address of the block minus
1174 // the address of the jump table. This is used for PIC jump tables where
1175 // gprel32 is not supported. e.g.:
1176 // .word LBB123 - LJTI1_2
1177 // If the .set directive is supported, this is emitted as:
1178 // .set L4_5_set_123, LBB123 - LJTI1_2
1179 // .word L4_5_set_123
1181 // If we have emitted set directives for the jump table entries, print
1182 // them rather than the entries themselves. If we're emitting PIC, then
1183 // emit the table entries as differences between two text section labels.
1184 if (MAI->hasSetDirective()) {
1185 // If we used .set, reference the .set's symbol.
1186 Value = MCSymbolRefExpr::Create(GetJTSetSymbol(UID, MBB->getNumber()),
1190 // Otherwise, use the difference as the jump table entry.
1191 Value = MCSymbolRefExpr::Create(MBB->getSymbol(), OutContext);
1192 const MCExpr *JTI = MCSymbolRefExpr::Create(GetJTISymbol(UID), OutContext);
1193 Value = MCBinaryExpr::CreateSub(Value, JTI, OutContext);
1198 assert(Value && "Unknown entry kind!");
1200 unsigned EntrySize = MJTI->getEntrySize(*TM.getDataLayout());
1201 OutStreamer.EmitValue(Value, EntrySize, /*addrspace*/0);
1205 /// EmitSpecialLLVMGlobal - Check to see if the specified global is a
1206 /// special global used by LLVM. If so, emit it and return true, otherwise
1207 /// do nothing and return false.
1208 bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
1209 if (GV->getName() == "llvm.used") {
1210 if (MAI->hasNoDeadStrip()) // No need to emit this at all.
1211 EmitLLVMUsedList(GV->getInitializer());
1215 // Ignore debug and non-emitted data. This handles llvm.compiler.used.
1216 if (GV->getSection() == "llvm.metadata" ||
1217 GV->hasAvailableExternallyLinkage())
1220 if (!GV->hasAppendingLinkage()) return false;
1222 assert(GV->hasInitializer() && "Not a special LLVM global!");
1224 if (GV->getName() == "llvm.global_ctors") {
1225 EmitXXStructorList(GV->getInitializer(), /* isCtor */ true);
1227 if (TM.getRelocationModel() == Reloc::Static &&
1228 MAI->hasStaticCtorDtorReferenceInStaticMode()) {
1229 StringRef Sym(".constructors_used");
1230 OutStreamer.EmitSymbolAttribute(OutContext.GetOrCreateSymbol(Sym),
1236 if (GV->getName() == "llvm.global_dtors") {
1237 EmitXXStructorList(GV->getInitializer(), /* isCtor */ false);
1239 if (TM.getRelocationModel() == Reloc::Static &&
1240 MAI->hasStaticCtorDtorReferenceInStaticMode()) {
1241 StringRef Sym(".destructors_used");
1242 OutStreamer.EmitSymbolAttribute(OutContext.GetOrCreateSymbol(Sym),
1251 /// EmitLLVMUsedList - For targets that define a MAI::UsedDirective, mark each
1252 /// global in the specified llvm.used list for which emitUsedDirectiveFor
1253 /// is true, as being used with this directive.
1254 void AsmPrinter::EmitLLVMUsedList(const Constant *List) {
1255 // Should be an array of 'i8*'.
1256 const ConstantArray *InitList = dyn_cast<ConstantArray>(List);
1257 if (InitList == 0) return;
1259 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
1260 const GlobalValue *GV =
1261 dyn_cast<GlobalValue>(InitList->getOperand(i)->stripPointerCasts());
1262 if (GV && getObjFileLowering().shouldEmitUsedDirectiveFor(GV, Mang))
1263 OutStreamer.EmitSymbolAttribute(Mang->getSymbol(GV), MCSA_NoDeadStrip);
1267 typedef std::pair<unsigned, Constant*> Structor;
1269 static bool priority_order(const Structor& lhs, const Structor& rhs) {
1270 return lhs.first < rhs.first;
1273 /// EmitXXStructorList - Emit the ctor or dtor list taking into account the init
1275 void AsmPrinter::EmitXXStructorList(const Constant *List, bool isCtor) {
1276 // Should be an array of '{ int, void ()* }' structs. The first value is the
1278 if (!isa<ConstantArray>(List)) return;
1280 // Sanity check the structors list.
1281 const ConstantArray *InitList = dyn_cast<ConstantArray>(List);
1282 if (!InitList) return; // Not an array!
1283 StructType *ETy = dyn_cast<StructType>(InitList->getType()->getElementType());
1284 if (!ETy || ETy->getNumElements() != 2) return; // Not an array of pairs!
1285 if (!isa<IntegerType>(ETy->getTypeAtIndex(0U)) ||
1286 !isa<PointerType>(ETy->getTypeAtIndex(1U))) return; // Not (int, ptr).
1288 // Gather the structors in a form that's convenient for sorting by priority.
1289 SmallVector<Structor, 8> Structors;
1290 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
1291 ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i));
1292 if (!CS) continue; // Malformed.
1293 if (CS->getOperand(1)->isNullValue())
1294 break; // Found a null terminator, skip the rest.
1295 ConstantInt *Priority = dyn_cast<ConstantInt>(CS->getOperand(0));
1296 if (!Priority) continue; // Malformed.
1297 Structors.push_back(std::make_pair(Priority->getLimitedValue(65535),
1298 CS->getOperand(1)));
1301 // Emit the function pointers in the target-specific order
1302 const DataLayout *TD = TM.getDataLayout();
1303 unsigned Align = Log2_32(TD->getPointerPrefAlignment());
1304 std::stable_sort(Structors.begin(), Structors.end(), priority_order);
1305 for (unsigned i = 0, e = Structors.size(); i != e; ++i) {
1306 const MCSection *OutputSection =
1308 getObjFileLowering().getStaticCtorSection(Structors[i].first) :
1309 getObjFileLowering().getStaticDtorSection(Structors[i].first));
1310 OutStreamer.SwitchSection(OutputSection);
1311 if (OutStreamer.getCurrentSection() != OutStreamer.getPreviousSection())
1312 EmitAlignment(Align);
1313 EmitXXStructor(Structors[i].second);
1317 //===--------------------------------------------------------------------===//
1318 // Emission and print routines
1321 /// EmitInt8 - Emit a byte directive and value.
1323 void AsmPrinter::EmitInt8(int Value) const {
1324 OutStreamer.EmitIntValue(Value, 1, 0/*addrspace*/);
1327 /// EmitInt16 - Emit a short directive and value.
1329 void AsmPrinter::EmitInt16(int Value) const {
1330 OutStreamer.EmitIntValue(Value, 2, 0/*addrspace*/);
1333 /// EmitInt32 - Emit a long directive and value.
1335 void AsmPrinter::EmitInt32(int Value) const {
1336 OutStreamer.EmitIntValue(Value, 4, 0/*addrspace*/);
1339 /// EmitLabelDifference - Emit something like ".long Hi-Lo" where the size
1340 /// in bytes of the directive is specified by Size and Hi/Lo specify the
1341 /// labels. This implicitly uses .set if it is available.
1342 void AsmPrinter::EmitLabelDifference(const MCSymbol *Hi, const MCSymbol *Lo,
1343 unsigned Size) const {
1344 // Get the Hi-Lo expression.
1345 const MCExpr *Diff =
1346 MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(Hi, OutContext),
1347 MCSymbolRefExpr::Create(Lo, OutContext),
1350 if (!MAI->hasSetDirective()) {
1351 OutStreamer.EmitValue(Diff, Size, 0/*AddrSpace*/);
1355 // Otherwise, emit with .set (aka assignment).
1356 MCSymbol *SetLabel = GetTempSymbol("set", SetCounter++);
1357 OutStreamer.EmitAssignment(SetLabel, Diff);
1358 OutStreamer.EmitSymbolValue(SetLabel, Size, 0/*AddrSpace*/);
1361 /// EmitLabelOffsetDifference - Emit something like ".long Hi+Offset-Lo"
1362 /// where the size in bytes of the directive is specified by Size and Hi/Lo
1363 /// specify the labels. This implicitly uses .set if it is available.
1364 void AsmPrinter::EmitLabelOffsetDifference(const MCSymbol *Hi, uint64_t Offset,
1365 const MCSymbol *Lo, unsigned Size)
1368 // Emit Hi+Offset - Lo
1369 // Get the Hi+Offset expression.
1370 const MCExpr *Plus =
1371 MCBinaryExpr::CreateAdd(MCSymbolRefExpr::Create(Hi, OutContext),
1372 MCConstantExpr::Create(Offset, OutContext),
1375 // Get the Hi+Offset-Lo expression.
1376 const MCExpr *Diff =
1377 MCBinaryExpr::CreateSub(Plus,
1378 MCSymbolRefExpr::Create(Lo, OutContext),
1381 if (!MAI->hasSetDirective())
1382 OutStreamer.EmitValue(Diff, 4, 0/*AddrSpace*/);
1384 // Otherwise, emit with .set (aka assignment).
1385 MCSymbol *SetLabel = GetTempSymbol("set", SetCounter++);
1386 OutStreamer.EmitAssignment(SetLabel, Diff);
1387 OutStreamer.EmitSymbolValue(SetLabel, 4, 0/*AddrSpace*/);
1391 /// EmitLabelPlusOffset - Emit something like ".long Label+Offset"
1392 /// where the size in bytes of the directive is specified by Size and Label
1393 /// specifies the label. This implicitly uses .set if it is available.
1394 void AsmPrinter::EmitLabelPlusOffset(const MCSymbol *Label, uint64_t Offset,
1398 // Emit Label+Offset (or just Label if Offset is zero)
1399 const MCExpr *Expr = MCSymbolRefExpr::Create(Label, OutContext);
1401 Expr = MCBinaryExpr::CreateAdd(Expr,
1402 MCConstantExpr::Create(Offset, OutContext),
1405 OutStreamer.EmitValue(Expr, Size, 0/*AddrSpace*/);
1409 //===----------------------------------------------------------------------===//
1411 // EmitAlignment - Emit an alignment directive to the specified power of
1412 // two boundary. For example, if you pass in 3 here, you will get an 8
1413 // byte alignment. If a global value is specified, and if that global has
1414 // an explicit alignment requested, it will override the alignment request
1415 // if required for correctness.
1417 void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV) const {
1418 if (GV) NumBits = getGVAlignmentLog2(GV, *TM.getDataLayout(), NumBits);
1420 if (NumBits == 0) return; // 1-byte aligned: no need to emit alignment.
1422 if (getCurrentSection()->getKind().isText())
1423 OutStreamer.EmitCodeAlignment(1 << NumBits);
1425 OutStreamer.EmitValueToAlignment(1 << NumBits, 0, 1, 0);
1428 //===----------------------------------------------------------------------===//
1429 // Constant emission.
1430 //===----------------------------------------------------------------------===//
1432 /// lowerConstant - Lower the specified LLVM Constant to an MCExpr.
1434 static const MCExpr *lowerConstant(const Constant *CV, AsmPrinter &AP) {
1435 MCContext &Ctx = AP.OutContext;
1437 if (CV->isNullValue() || isa<UndefValue>(CV))
1438 return MCConstantExpr::Create(0, Ctx);
1440 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV))
1441 return MCConstantExpr::Create(CI->getZExtValue(), Ctx);
1443 if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV))
1444 return MCSymbolRefExpr::Create(AP.Mang->getSymbol(GV), Ctx);
1446 if (const BlockAddress *BA = dyn_cast<BlockAddress>(CV))
1447 return MCSymbolRefExpr::Create(AP.GetBlockAddressSymbol(BA), Ctx);
1449 const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV);
1451 llvm_unreachable("Unknown constant value to lower!");
1454 switch (CE->getOpcode()) {
1456 // If the code isn't optimized, there may be outstanding folding
1457 // opportunities. Attempt to fold the expression using DataLayout as a
1458 // last resort before giving up.
1460 ConstantFoldConstantExpression(CE, AP.TM.getDataLayout()))
1462 return lowerConstant(C, AP);
1464 // Otherwise report the problem to the user.
1467 raw_string_ostream OS(S);
1468 OS << "Unsupported expression in static initializer: ";
1469 WriteAsOperand(OS, CE, /*PrintType=*/false,
1470 !AP.MF ? 0 : AP.MF->getFunction()->getParent());
1471 report_fatal_error(OS.str());
1473 case Instruction::GetElementPtr: {
1474 const DataLayout &TD = *AP.TM.getDataLayout();
1475 // Generate a symbolic expression for the byte address
1476 const Constant *PtrVal = CE->getOperand(0);
1477 SmallVector<Value*, 8> IdxVec(CE->op_begin()+1, CE->op_end());
1478 int64_t Offset = TD.getIndexedOffset(PtrVal->getType(), IdxVec);
1480 const MCExpr *Base = lowerConstant(CE->getOperand(0), AP);
1484 // Truncate/sext the offset to the pointer size.
1485 unsigned Width = TD.getPointerSizeInBits();
1487 Offset = SignExtend64(Offset, Width);
1489 return MCBinaryExpr::CreateAdd(Base, MCConstantExpr::Create(Offset, Ctx),
1493 case Instruction::Trunc:
1494 // We emit the value and depend on the assembler to truncate the generated
1495 // expression properly. This is important for differences between
1496 // blockaddress labels. Since the two labels are in the same function, it
1497 // is reasonable to treat their delta as a 32-bit value.
1499 case Instruction::BitCast:
1500 return lowerConstant(CE->getOperand(0), AP);
1502 case Instruction::IntToPtr: {
1503 const DataLayout &TD = *AP.TM.getDataLayout();
1504 // Handle casts to pointers by changing them into casts to the appropriate
1505 // integer type. This promotes constant folding and simplifies this code.
1506 Constant *Op = CE->getOperand(0);
1507 Op = ConstantExpr::getIntegerCast(Op, TD.getIntPtrType(CV->getContext()),
1509 return lowerConstant(Op, AP);
1512 case Instruction::PtrToInt: {
1513 const DataLayout &TD = *AP.TM.getDataLayout();
1514 // Support only foldable casts to/from pointers that can be eliminated by
1515 // changing the pointer to the appropriately sized integer type.
1516 Constant *Op = CE->getOperand(0);
1517 Type *Ty = CE->getType();
1519 const MCExpr *OpExpr = lowerConstant(Op, AP);
1521 // We can emit the pointer value into this slot if the slot is an
1522 // integer slot equal to the size of the pointer.
1523 if (TD.getTypeAllocSize(Ty) == TD.getTypeAllocSize(Op->getType()))
1526 // Otherwise the pointer is smaller than the resultant integer, mask off
1527 // the high bits so we are sure to get a proper truncation if the input is
1529 unsigned InBits = TD.getTypeAllocSizeInBits(Op->getType());
1530 const MCExpr *MaskExpr = MCConstantExpr::Create(~0ULL >> (64-InBits), Ctx);
1531 return MCBinaryExpr::CreateAnd(OpExpr, MaskExpr, Ctx);
1534 // The MC library also has a right-shift operator, but it isn't consistently
1535 // signed or unsigned between different targets.
1536 case Instruction::Add:
1537 case Instruction::Sub:
1538 case Instruction::Mul:
1539 case Instruction::SDiv:
1540 case Instruction::SRem:
1541 case Instruction::Shl:
1542 case Instruction::And:
1543 case Instruction::Or:
1544 case Instruction::Xor: {
1545 const MCExpr *LHS = lowerConstant(CE->getOperand(0), AP);
1546 const MCExpr *RHS = lowerConstant(CE->getOperand(1), AP);
1547 switch (CE->getOpcode()) {
1548 default: llvm_unreachable("Unknown binary operator constant cast expr");
1549 case Instruction::Add: return MCBinaryExpr::CreateAdd(LHS, RHS, Ctx);
1550 case Instruction::Sub: return MCBinaryExpr::CreateSub(LHS, RHS, Ctx);
1551 case Instruction::Mul: return MCBinaryExpr::CreateMul(LHS, RHS, Ctx);
1552 case Instruction::SDiv: return MCBinaryExpr::CreateDiv(LHS, RHS, Ctx);
1553 case Instruction::SRem: return MCBinaryExpr::CreateMod(LHS, RHS, Ctx);
1554 case Instruction::Shl: return MCBinaryExpr::CreateShl(LHS, RHS, Ctx);
1555 case Instruction::And: return MCBinaryExpr::CreateAnd(LHS, RHS, Ctx);
1556 case Instruction::Or: return MCBinaryExpr::CreateOr (LHS, RHS, Ctx);
1557 case Instruction::Xor: return MCBinaryExpr::CreateXor(LHS, RHS, Ctx);
1563 static void emitGlobalConstantImpl(const Constant *C, unsigned AddrSpace,
1566 /// isRepeatedByteSequence - Determine whether the given value is
1567 /// composed of a repeated sequence of identical bytes and return the
1568 /// byte value. If it is not a repeated sequence, return -1.
1569 static int isRepeatedByteSequence(const ConstantDataSequential *V) {
1570 StringRef Data = V->getRawDataValues();
1571 assert(!Data.empty() && "Empty aggregates should be CAZ node");
1573 for (unsigned i = 1, e = Data.size(); i != e; ++i)
1574 if (Data[i] != C) return -1;
1575 return static_cast<uint8_t>(C); // Ensure 255 is not returned as -1.
1579 /// isRepeatedByteSequence - Determine whether the given value is
1580 /// composed of a repeated sequence of identical bytes and return the
1581 /// byte value. If it is not a repeated sequence, return -1.
1582 static int isRepeatedByteSequence(const Value *V, TargetMachine &TM) {
1584 if (const ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
1585 if (CI->getBitWidth() > 64) return -1;
1587 uint64_t Size = TM.getDataLayout()->getTypeAllocSize(V->getType());
1588 uint64_t Value = CI->getZExtValue();
1590 // Make sure the constant is at least 8 bits long and has a power
1591 // of 2 bit width. This guarantees the constant bit width is
1592 // always a multiple of 8 bits, avoiding issues with padding out
1593 // to Size and other such corner cases.
1594 if (CI->getBitWidth() < 8 || !isPowerOf2_64(CI->getBitWidth())) return -1;
1596 uint8_t Byte = static_cast<uint8_t>(Value);
1598 for (unsigned i = 1; i < Size; ++i) {
1600 if (static_cast<uint8_t>(Value) != Byte) return -1;
1604 if (const ConstantArray *CA = dyn_cast<ConstantArray>(V)) {
1605 // Make sure all array elements are sequences of the same repeated
1607 assert(CA->getNumOperands() != 0 && "Should be a CAZ");
1608 int Byte = isRepeatedByteSequence(CA->getOperand(0), TM);
1609 if (Byte == -1) return -1;
1611 for (unsigned i = 1, e = CA->getNumOperands(); i != e; ++i) {
1612 int ThisByte = isRepeatedByteSequence(CA->getOperand(i), TM);
1613 if (ThisByte == -1) return -1;
1614 if (Byte != ThisByte) return -1;
1619 if (const ConstantDataSequential *CDS = dyn_cast<ConstantDataSequential>(V))
1620 return isRepeatedByteSequence(CDS);
1625 static void emitGlobalConstantDataSequential(const ConstantDataSequential *CDS,
1626 unsigned AddrSpace,AsmPrinter &AP){
1628 // See if we can aggregate this into a .fill, if so, emit it as such.
1629 int Value = isRepeatedByteSequence(CDS, AP.TM);
1631 uint64_t Bytes = AP.TM.getDataLayout()->getTypeAllocSize(CDS->getType());
1632 // Don't emit a 1-byte object as a .fill.
1634 return AP.OutStreamer.EmitFill(Bytes, Value, AddrSpace);
1637 // If this can be emitted with .ascii/.asciz, emit it as such.
1638 if (CDS->isString())
1639 return AP.OutStreamer.EmitBytes(CDS->getAsString(), AddrSpace);
1641 // Otherwise, emit the values in successive locations.
1642 unsigned ElementByteSize = CDS->getElementByteSize();
1643 if (isa<IntegerType>(CDS->getElementType())) {
1644 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) {
1646 AP.OutStreamer.GetCommentOS() << format("0x%" PRIx64 "\n",
1647 CDS->getElementAsInteger(i));
1648 AP.OutStreamer.EmitIntValue(CDS->getElementAsInteger(i),
1649 ElementByteSize, AddrSpace);
1651 } else if (ElementByteSize == 4) {
1652 // FP Constants are printed as integer constants to avoid losing
1654 assert(CDS->getElementType()->isFloatTy());
1655 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) {
1661 F = CDS->getElementAsFloat(i);
1663 AP.OutStreamer.GetCommentOS() << "float " << F << '\n';
1664 AP.OutStreamer.EmitIntValue(I, 4, AddrSpace);
1667 assert(CDS->getElementType()->isDoubleTy());
1668 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) {
1674 F = CDS->getElementAsDouble(i);
1676 AP.OutStreamer.GetCommentOS() << "double " << F << '\n';
1677 AP.OutStreamer.EmitIntValue(I, 8, AddrSpace);
1681 const DataLayout &TD = *AP.TM.getDataLayout();
1682 unsigned Size = TD.getTypeAllocSize(CDS->getType());
1683 unsigned EmittedSize = TD.getTypeAllocSize(CDS->getType()->getElementType()) *
1684 CDS->getNumElements();
1685 if (unsigned Padding = Size - EmittedSize)
1686 AP.OutStreamer.EmitZeros(Padding, AddrSpace);
1690 static void emitGlobalConstantArray(const ConstantArray *CA, unsigned AddrSpace,
1692 // See if we can aggregate some values. Make sure it can be
1693 // represented as a series of bytes of the constant value.
1694 int Value = isRepeatedByteSequence(CA, AP.TM);
1697 uint64_t Bytes = AP.TM.getDataLayout()->getTypeAllocSize(CA->getType());
1698 AP.OutStreamer.EmitFill(Bytes, Value, AddrSpace);
1701 for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i)
1702 emitGlobalConstantImpl(CA->getOperand(i), AddrSpace, AP);
1706 static void emitGlobalConstantVector(const ConstantVector *CV,
1707 unsigned AddrSpace, AsmPrinter &AP) {
1708 for (unsigned i = 0, e = CV->getType()->getNumElements(); i != e; ++i)
1709 emitGlobalConstantImpl(CV->getOperand(i), AddrSpace, AP);
1711 const DataLayout &TD = *AP.TM.getDataLayout();
1712 unsigned Size = TD.getTypeAllocSize(CV->getType());
1713 unsigned EmittedSize = TD.getTypeAllocSize(CV->getType()->getElementType()) *
1714 CV->getType()->getNumElements();
1715 if (unsigned Padding = Size - EmittedSize)
1716 AP.OutStreamer.EmitZeros(Padding, AddrSpace);
1719 static void emitGlobalConstantStruct(const ConstantStruct *CS,
1720 unsigned AddrSpace, AsmPrinter &AP) {
1721 // Print the fields in successive locations. Pad to align if needed!
1722 const DataLayout *TD = AP.TM.getDataLayout();
1723 unsigned Size = TD->getTypeAllocSize(CS->getType());
1724 const StructLayout *Layout = TD->getStructLayout(CS->getType());
1725 uint64_t SizeSoFar = 0;
1726 for (unsigned i = 0, e = CS->getNumOperands(); i != e; ++i) {
1727 const Constant *Field = CS->getOperand(i);
1729 // Check if padding is needed and insert one or more 0s.
1730 uint64_t FieldSize = TD->getTypeAllocSize(Field->getType());
1731 uint64_t PadSize = ((i == e-1 ? Size : Layout->getElementOffset(i+1))
1732 - Layout->getElementOffset(i)) - FieldSize;
1733 SizeSoFar += FieldSize + PadSize;
1735 // Now print the actual field value.
1736 emitGlobalConstantImpl(Field, AddrSpace, AP);
1738 // Insert padding - this may include padding to increase the size of the
1739 // current field up to the ABI size (if the struct is not packed) as well
1740 // as padding to ensure that the next field starts at the right offset.
1741 AP.OutStreamer.EmitZeros(PadSize, AddrSpace);
1743 assert(SizeSoFar == Layout->getSizeInBytes() &&
1744 "Layout of constant struct may be incorrect!");
1747 static void emitGlobalConstantFP(const ConstantFP *CFP, unsigned AddrSpace,
1749 if (CFP->getType()->isHalfTy()) {
1750 if (AP.isVerbose()) {
1751 SmallString<10> Str;
1752 CFP->getValueAPF().toString(Str);
1753 AP.OutStreamer.GetCommentOS() << "half " << Str << '\n';
1755 uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1756 AP.OutStreamer.EmitIntValue(Val, 2, AddrSpace);
1760 if (CFP->getType()->isFloatTy()) {
1761 if (AP.isVerbose()) {
1762 float Val = CFP->getValueAPF().convertToFloat();
1763 uint64_t IntVal = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1764 AP.OutStreamer.GetCommentOS() << "float " << Val << '\n'
1765 << " (" << format("0x%x", IntVal) << ")\n";
1767 uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1768 AP.OutStreamer.EmitIntValue(Val, 4, AddrSpace);
1772 // FP Constants are printed as integer constants to avoid losing
1774 if (CFP->getType()->isDoubleTy()) {
1775 if (AP.isVerbose()) {
1776 double Val = CFP->getValueAPF().convertToDouble();
1777 uint64_t IntVal = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1778 AP.OutStreamer.GetCommentOS() << "double " << Val << '\n'
1779 << " (" << format("0x%lx", IntVal) << ")\n";
1782 uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1783 AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace);
1787 if (CFP->getType()->isX86_FP80Ty()) {
1788 // all long double variants are printed as hex
1789 // API needed to prevent premature destruction
1790 APInt API = CFP->getValueAPF().bitcastToAPInt();
1791 const uint64_t *p = API.getRawData();
1792 if (AP.isVerbose()) {
1793 // Convert to double so we can print the approximate val as a comment.
1794 APFloat DoubleVal = CFP->getValueAPF();
1796 DoubleVal.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven,
1798 AP.OutStreamer.GetCommentOS() << "x86_fp80 ~= "
1799 << DoubleVal.convertToDouble() << '\n';
1802 if (AP.TM.getDataLayout()->isBigEndian()) {
1803 AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace);
1804 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1806 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1807 AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace);
1810 // Emit the tail padding for the long double.
1811 const DataLayout &TD = *AP.TM.getDataLayout();
1812 AP.OutStreamer.EmitZeros(TD.getTypeAllocSize(CFP->getType()) -
1813 TD.getTypeStoreSize(CFP->getType()), AddrSpace);
1817 assert(CFP->getType()->isPPC_FP128Ty() &&
1818 "Floating point constant type not handled");
1819 // All long double variants are printed as hex
1820 // API needed to prevent premature destruction.
1821 APInt API = CFP->getValueAPF().bitcastToAPInt();
1822 const uint64_t *p = API.getRawData();
1823 if (AP.TM.getDataLayout()->isBigEndian()) {
1824 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1825 AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace);
1827 AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace);
1828 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1832 static void emitGlobalConstantLargeInt(const ConstantInt *CI,
1833 unsigned AddrSpace, AsmPrinter &AP) {
1834 const DataLayout *TD = AP.TM.getDataLayout();
1835 unsigned BitWidth = CI->getBitWidth();
1836 assert((BitWidth & 63) == 0 && "only support multiples of 64-bits");
1838 // We don't expect assemblers to support integer data directives
1839 // for more than 64 bits, so we emit the data in at most 64-bit
1840 // quantities at a time.
1841 const uint64_t *RawData = CI->getValue().getRawData();
1842 for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) {
1843 uint64_t Val = TD->isBigEndian() ? RawData[e - i - 1] : RawData[i];
1844 AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace);
1848 static void emitGlobalConstantImpl(const Constant *CV, unsigned AddrSpace,
1850 const DataLayout *TD = AP.TM.getDataLayout();
1851 uint64_t Size = TD->getTypeAllocSize(CV->getType());
1852 if (isa<ConstantAggregateZero>(CV) || isa<UndefValue>(CV))
1853 return AP.OutStreamer.EmitZeros(Size, AddrSpace);
1855 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
1862 AP.OutStreamer.GetCommentOS() << format("0x%" PRIx64 "\n",
1863 CI->getZExtValue());
1864 AP.OutStreamer.EmitIntValue(CI->getZExtValue(), Size, AddrSpace);
1867 emitGlobalConstantLargeInt(CI, AddrSpace, AP);
1872 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV))
1873 return emitGlobalConstantFP(CFP, AddrSpace, AP);
1875 if (isa<ConstantPointerNull>(CV)) {
1876 AP.OutStreamer.EmitIntValue(0, Size, AddrSpace);
1880 if (const ConstantDataSequential *CDS = dyn_cast<ConstantDataSequential>(CV))
1881 return emitGlobalConstantDataSequential(CDS, AddrSpace, AP);
1883 if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV))
1884 return emitGlobalConstantArray(CVA, AddrSpace, AP);
1886 if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV))
1887 return emitGlobalConstantStruct(CVS, AddrSpace, AP);
1889 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) {
1890 // Look through bitcasts, which might not be able to be MCExpr'ized (e.g. of
1892 if (CE->getOpcode() == Instruction::BitCast)
1893 return emitGlobalConstantImpl(CE->getOperand(0), AddrSpace, AP);
1896 // If the constant expression's size is greater than 64-bits, then we have
1897 // to emit the value in chunks. Try to constant fold the value and emit it
1899 Constant *New = ConstantFoldConstantExpression(CE, TD);
1900 if (New && New != CE)
1901 return emitGlobalConstantImpl(New, AddrSpace, AP);
1905 if (const ConstantVector *V = dyn_cast<ConstantVector>(CV))
1906 return emitGlobalConstantVector(V, AddrSpace, AP);
1908 // Otherwise, it must be a ConstantExpr. Lower it to an MCExpr, then emit it
1909 // thread the streamer with EmitValue.
1910 AP.OutStreamer.EmitValue(lowerConstant(CV, AP), Size, AddrSpace);
1913 /// EmitGlobalConstant - Print a general LLVM constant to the .s file.
1914 void AsmPrinter::EmitGlobalConstant(const Constant *CV, unsigned AddrSpace) {
1915 uint64_t Size = TM.getDataLayout()->getTypeAllocSize(CV->getType());
1917 emitGlobalConstantImpl(CV, AddrSpace, *this);
1918 else if (MAI->hasSubsectionsViaSymbols()) {
1919 // If the global has zero size, emit a single byte so that two labels don't
1920 // look like they are at the same location.
1921 OutStreamer.EmitIntValue(0, 1, AddrSpace);
1925 void AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
1926 // Target doesn't support this yet!
1927 llvm_unreachable("Target does not support EmitMachineConstantPoolValue");
1930 void AsmPrinter::printOffset(int64_t Offset, raw_ostream &OS) const {
1932 OS << '+' << Offset;
1933 else if (Offset < 0)
1937 //===----------------------------------------------------------------------===//
1938 // Symbol Lowering Routines.
1939 //===----------------------------------------------------------------------===//
1941 /// GetTempSymbol - Return the MCSymbol corresponding to the assembler
1942 /// temporary label with the specified stem and unique ID.
1943 MCSymbol *AsmPrinter::GetTempSymbol(StringRef Name, unsigned ID) const {
1944 return OutContext.GetOrCreateSymbol(Twine(MAI->getPrivateGlobalPrefix()) +
1948 /// GetTempSymbol - Return an assembler temporary label with the specified
1950 MCSymbol *AsmPrinter::GetTempSymbol(StringRef Name) const {
1951 return OutContext.GetOrCreateSymbol(Twine(MAI->getPrivateGlobalPrefix())+
1956 MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BlockAddress *BA) const {
1957 return MMI->getAddrLabelSymbol(BA->getBasicBlock());
1960 MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BasicBlock *BB) const {
1961 return MMI->getAddrLabelSymbol(BB);
1964 /// GetCPISymbol - Return the symbol for the specified constant pool entry.
1965 MCSymbol *AsmPrinter::GetCPISymbol(unsigned CPID) const {
1966 return OutContext.GetOrCreateSymbol
1967 (Twine(MAI->getPrivateGlobalPrefix()) + "CPI" + Twine(getFunctionNumber())
1968 + "_" + Twine(CPID));
1971 /// GetJTISymbol - Return the symbol for the specified jump table entry.
1972 MCSymbol *AsmPrinter::GetJTISymbol(unsigned JTID, bool isLinkerPrivate) const {
1973 return MF->getJTISymbol(JTID, OutContext, isLinkerPrivate);
1976 /// GetJTSetSymbol - Return the symbol for the specified jump table .set
1977 /// FIXME: privatize to AsmPrinter.
1978 MCSymbol *AsmPrinter::GetJTSetSymbol(unsigned UID, unsigned MBBID) const {
1979 return OutContext.GetOrCreateSymbol
1980 (Twine(MAI->getPrivateGlobalPrefix()) + Twine(getFunctionNumber()) + "_" +
1981 Twine(UID) + "_set_" + Twine(MBBID));
1984 /// GetSymbolWithGlobalValueBase - Return the MCSymbol for a symbol with
1985 /// global value name as its base, with the specified suffix, and where the
1986 /// symbol is forced to have private linkage if ForcePrivate is true.
1987 MCSymbol *AsmPrinter::GetSymbolWithGlobalValueBase(const GlobalValue *GV,
1989 bool ForcePrivate) const {
1990 SmallString<60> NameStr;
1991 Mang->getNameWithPrefix(NameStr, GV, ForcePrivate);
1992 NameStr.append(Suffix.begin(), Suffix.end());
1993 return OutContext.GetOrCreateSymbol(NameStr.str());
1996 /// GetExternalSymbolSymbol - Return the MCSymbol for the specified
1998 MCSymbol *AsmPrinter::GetExternalSymbolSymbol(StringRef Sym) const {
1999 SmallString<60> NameStr;
2000 Mang->getNameWithPrefix(NameStr, Sym);
2001 return OutContext.GetOrCreateSymbol(NameStr.str());
2006 /// PrintParentLoopComment - Print comments about parent loops of this one.
2007 static void PrintParentLoopComment(raw_ostream &OS, const MachineLoop *Loop,
2008 unsigned FunctionNumber) {
2009 if (Loop == 0) return;
2010 PrintParentLoopComment(OS, Loop->getParentLoop(), FunctionNumber);
2011 OS.indent(Loop->getLoopDepth()*2)
2012 << "Parent Loop BB" << FunctionNumber << "_"
2013 << Loop->getHeader()->getNumber()
2014 << " Depth=" << Loop->getLoopDepth() << '\n';
2018 /// PrintChildLoopComment - Print comments about child loops within
2019 /// the loop for this basic block, with nesting.
2020 static void PrintChildLoopComment(raw_ostream &OS, const MachineLoop *Loop,
2021 unsigned FunctionNumber) {
2022 // Add child loop information
2023 for (MachineLoop::iterator CL = Loop->begin(), E = Loop->end();CL != E; ++CL){
2024 OS.indent((*CL)->getLoopDepth()*2)
2025 << "Child Loop BB" << FunctionNumber << "_"
2026 << (*CL)->getHeader()->getNumber() << " Depth " << (*CL)->getLoopDepth()
2028 PrintChildLoopComment(OS, *CL, FunctionNumber);
2032 /// emitBasicBlockLoopComments - Pretty-print comments for basic blocks.
2033 static void emitBasicBlockLoopComments(const MachineBasicBlock &MBB,
2034 const MachineLoopInfo *LI,
2035 const AsmPrinter &AP) {
2036 // Add loop depth information
2037 const MachineLoop *Loop = LI->getLoopFor(&MBB);
2038 if (Loop == 0) return;
2040 MachineBasicBlock *Header = Loop->getHeader();
2041 assert(Header && "No header for loop");
2043 // If this block is not a loop header, just print out what is the loop header
2045 if (Header != &MBB) {
2046 AP.OutStreamer.AddComment(" in Loop: Header=BB" +
2047 Twine(AP.getFunctionNumber())+"_" +
2048 Twine(Loop->getHeader()->getNumber())+
2049 " Depth="+Twine(Loop->getLoopDepth()));
2053 // Otherwise, it is a loop header. Print out information about child and
2055 raw_ostream &OS = AP.OutStreamer.GetCommentOS();
2057 PrintParentLoopComment(OS, Loop->getParentLoop(), AP.getFunctionNumber());
2060 OS.indent(Loop->getLoopDepth()*2-2);
2065 OS << "Loop Header: Depth=" + Twine(Loop->getLoopDepth()) << '\n';
2067 PrintChildLoopComment(OS, Loop, AP.getFunctionNumber());
2071 /// EmitBasicBlockStart - This method prints the label for the specified
2072 /// MachineBasicBlock, an alignment (if present) and a comment describing
2073 /// it if appropriate.
2074 void AsmPrinter::EmitBasicBlockStart(const MachineBasicBlock *MBB) const {
2075 // Emit an alignment directive for this block, if needed.
2076 if (unsigned Align = MBB->getAlignment())
2077 EmitAlignment(Align);
2079 // If the block has its address taken, emit any labels that were used to
2080 // reference the block. It is possible that there is more than one label
2081 // here, because multiple LLVM BB's may have been RAUW'd to this block after
2082 // the references were generated.
2083 if (MBB->hasAddressTaken()) {
2084 const BasicBlock *BB = MBB->getBasicBlock();
2086 OutStreamer.AddComment("Block address taken");
2088 std::vector<MCSymbol*> Syms = MMI->getAddrLabelSymbolToEmit(BB);
2090 for (unsigned i = 0, e = Syms.size(); i != e; ++i)
2091 OutStreamer.EmitLabel(Syms[i]);
2094 // Print some verbose block comments.
2096 if (const BasicBlock *BB = MBB->getBasicBlock())
2098 OutStreamer.AddComment("%" + BB->getName());
2099 emitBasicBlockLoopComments(*MBB, LI, *this);
2102 // Print the main label for the block.
2103 if (MBB->pred_empty() || isBlockOnlyReachableByFallthrough(MBB)) {
2104 if (isVerbose() && OutStreamer.hasRawTextSupport()) {
2105 // NOTE: Want this comment at start of line, don't emit with AddComment.
2106 OutStreamer.EmitRawText(Twine(MAI->getCommentString()) + " BB#" +
2107 Twine(MBB->getNumber()) + ":");
2110 OutStreamer.EmitLabel(MBB->getSymbol());
2114 void AsmPrinter::EmitVisibility(MCSymbol *Sym, unsigned Visibility,
2115 bool IsDefinition) const {
2116 MCSymbolAttr Attr = MCSA_Invalid;
2118 switch (Visibility) {
2120 case GlobalValue::HiddenVisibility:
2122 Attr = MAI->getHiddenVisibilityAttr();
2124 Attr = MAI->getHiddenDeclarationVisibilityAttr();
2126 case GlobalValue::ProtectedVisibility:
2127 Attr = MAI->getProtectedVisibilityAttr();
2131 if (Attr != MCSA_Invalid)
2132 OutStreamer.EmitSymbolAttribute(Sym, Attr);
2135 /// isBlockOnlyReachableByFallthough - Return true if the basic block has
2136 /// exactly one predecessor and the control transfer mechanism between
2137 /// the predecessor and this block is a fall-through.
2139 isBlockOnlyReachableByFallthrough(const MachineBasicBlock *MBB) const {
2140 // If this is a landing pad, it isn't a fall through. If it has no preds,
2141 // then nothing falls through to it.
2142 if (MBB->isLandingPad() || MBB->pred_empty())
2145 // If there isn't exactly one predecessor, it can't be a fall through.
2146 MachineBasicBlock::const_pred_iterator PI = MBB->pred_begin(), PI2 = PI;
2148 if (PI2 != MBB->pred_end())
2151 // The predecessor has to be immediately before this block.
2152 MachineBasicBlock *Pred = *PI;
2154 if (!Pred->isLayoutSuccessor(MBB))
2157 // If the block is completely empty, then it definitely does fall through.
2161 // Check the terminators in the previous blocks
2162 for (MachineBasicBlock::iterator II = Pred->getFirstTerminator(),
2163 IE = Pred->end(); II != IE; ++II) {
2164 MachineInstr &MI = *II;
2166 // If it is not a simple branch, we are in a table somewhere.
2167 if (!MI.isBranch() || MI.isIndirectBranch())
2170 // If we are the operands of one of the branches, this is not
2172 for (MachineInstr::mop_iterator OI = MI.operands_begin(),
2173 OE = MI.operands_end(); OI != OE; ++OI) {
2174 const MachineOperand& OP = *OI;
2177 if (OP.isMBB() && OP.getMBB() == MBB)
2187 GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy *S) {
2188 if (!S->usesMetadata())
2191 gcp_map_type &GCMap = getGCMap(GCMetadataPrinters);
2192 gcp_map_type::iterator GCPI = GCMap.find(S);
2193 if (GCPI != GCMap.end())
2194 return GCPI->second;
2196 const char *Name = S->getName().c_str();
2198 for (GCMetadataPrinterRegistry::iterator
2199 I = GCMetadataPrinterRegistry::begin(),
2200 E = GCMetadataPrinterRegistry::end(); I != E; ++I)
2201 if (strcmp(Name, I->getName()) == 0) {
2202 GCMetadataPrinter *GMP = I->instantiate();
2204 GCMap.insert(std::make_pair(S, GMP));
2208 report_fatal_error("no GCMetadataPrinter registered for GC: " + Twine(Name));