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())
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 /// getDataLayout - Return information about data layout.
135 const DataLayout &AsmPrinter::getDataLayout() const {
136 return *TM.getDataLayout();
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.getDataLayout());
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::LinkOnceODRAutoHideLinkage:
217 case GlobalValue::WeakAnyLinkage:
218 case GlobalValue::WeakODRLinkage:
219 case GlobalValue::LinkerPrivateWeakLinkage:
220 if (MAI->getWeakDefDirective() != 0) {
222 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
224 if ((GlobalValue::LinkageTypes)Linkage !=
225 GlobalValue::LinkOnceODRAutoHideLinkage)
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 DataLayout *TD = TM.getDataLayout();
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);
316 MAI->getLCOMMDirectiveAlignmentType() != LCOMM::NoAlignment) {
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 return OutStreamer.EmitLabel(CurrentFnSym);
481 report_fatal_error("'" + Twine(CurrentFnSym->getName()) +
482 "' label emitted multiple times to assembly file");
485 /// emitComments - Pretty-print comments for instructions.
486 static void emitComments(const MachineInstr &MI, raw_ostream &CommentOS) {
487 const MachineFunction *MF = MI.getParent()->getParent();
488 const TargetMachine &TM = MF->getTarget();
490 // Check for spills and reloads
493 const MachineFrameInfo *FrameInfo = MF->getFrameInfo();
495 // We assume a single instruction only has a spill or reload, not
497 const MachineMemOperand *MMO;
498 if (TM.getInstrInfo()->isLoadFromStackSlotPostFE(&MI, FI)) {
499 if (FrameInfo->isSpillSlotObjectIndex(FI)) {
500 MMO = *MI.memoperands_begin();
501 CommentOS << MMO->getSize() << "-byte Reload\n";
503 } else if (TM.getInstrInfo()->hasLoadFromStackSlot(&MI, MMO, FI)) {
504 if (FrameInfo->isSpillSlotObjectIndex(FI))
505 CommentOS << MMO->getSize() << "-byte Folded Reload\n";
506 } else if (TM.getInstrInfo()->isStoreToStackSlotPostFE(&MI, FI)) {
507 if (FrameInfo->isSpillSlotObjectIndex(FI)) {
508 MMO = *MI.memoperands_begin();
509 CommentOS << MMO->getSize() << "-byte Spill\n";
511 } else if (TM.getInstrInfo()->hasStoreToStackSlot(&MI, MMO, FI)) {
512 if (FrameInfo->isSpillSlotObjectIndex(FI))
513 CommentOS << MMO->getSize() << "-byte Folded Spill\n";
516 // Check for spill-induced copies
517 if (MI.getAsmPrinterFlag(MachineInstr::ReloadReuse))
518 CommentOS << " Reload Reuse\n";
521 /// emitImplicitDef - This method emits the specified machine instruction
522 /// that is an implicit def.
523 static void emitImplicitDef(const MachineInstr *MI, AsmPrinter &AP) {
524 unsigned RegNo = MI->getOperand(0).getReg();
525 AP.OutStreamer.AddComment(Twine("implicit-def: ") +
526 AP.TM.getRegisterInfo()->getName(RegNo));
527 AP.OutStreamer.AddBlankLine();
530 static void emitKill(const MachineInstr *MI, AsmPrinter &AP) {
531 std::string Str = "kill:";
532 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
533 const MachineOperand &Op = MI->getOperand(i);
534 assert(Op.isReg() && "KILL instruction must have only register operands");
536 Str += AP.TM.getRegisterInfo()->getName(Op.getReg());
537 Str += (Op.isDef() ? "<def>" : "<kill>");
539 AP.OutStreamer.AddComment(Str);
540 AP.OutStreamer.AddBlankLine();
543 /// emitDebugValueComment - This method handles the target-independent form
544 /// of DBG_VALUE, returning true if it was able to do so. A false return
545 /// means the target will need to handle MI in EmitInstruction.
546 static bool emitDebugValueComment(const MachineInstr *MI, AsmPrinter &AP) {
547 // This code handles only the 3-operand target-independent form.
548 if (MI->getNumOperands() != 3)
551 SmallString<128> Str;
552 raw_svector_ostream OS(Str);
553 OS << '\t' << AP.MAI->getCommentString() << "DEBUG_VALUE: ";
555 // cast away const; DIetc do not take const operands for some reason.
556 DIVariable V(const_cast<MDNode*>(MI->getOperand(2).getMetadata()));
557 if (V.getContext().isSubprogram())
558 OS << DISubprogram(V.getContext()).getDisplayName() << ":";
559 OS << V.getName() << " <- ";
561 // Register or immediate value. Register 0 means undef.
562 if (MI->getOperand(0).isFPImm()) {
563 APFloat APF = APFloat(MI->getOperand(0).getFPImm()->getValueAPF());
564 if (MI->getOperand(0).getFPImm()->getType()->isFloatTy()) {
565 OS << (double)APF.convertToFloat();
566 } else if (MI->getOperand(0).getFPImm()->getType()->isDoubleTy()) {
567 OS << APF.convertToDouble();
569 // There is no good way to print long double. Convert a copy to
570 // double. Ah well, it's only a comment.
572 APF.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven,
574 OS << "(long double) " << APF.convertToDouble();
576 } else if (MI->getOperand(0).isImm()) {
577 OS << MI->getOperand(0).getImm();
578 } else if (MI->getOperand(0).isCImm()) {
579 MI->getOperand(0).getCImm()->getValue().print(OS, false /*isSigned*/);
581 assert(MI->getOperand(0).isReg() && "Unknown operand type");
582 if (MI->getOperand(0).getReg() == 0) {
583 // Suppress offset, it is not meaningful here.
585 // NOTE: Want this comment at start of line, don't emit with AddComment.
586 AP.OutStreamer.EmitRawText(OS.str());
589 OS << AP.TM.getRegisterInfo()->getName(MI->getOperand(0).getReg());
592 OS << '+' << MI->getOperand(1).getImm();
593 // NOTE: Want this comment at start of line, don't emit with AddComment.
594 AP.OutStreamer.EmitRawText(OS.str());
598 AsmPrinter::CFIMoveType AsmPrinter::needsCFIMoves() {
599 if (MAI->getExceptionHandlingType() == ExceptionHandling::DwarfCFI &&
600 MF->getFunction()->needsUnwindTableEntry())
603 if (MMI->hasDebugInfo())
609 bool AsmPrinter::needsSEHMoves() {
610 return MAI->getExceptionHandlingType() == ExceptionHandling::Win64 &&
611 MF->getFunction()->needsUnwindTableEntry();
614 bool AsmPrinter::needsRelocationsForDwarfStringPool() const {
615 return MAI->doesDwarfUseRelocationsAcrossSections();
618 void AsmPrinter::emitPrologLabel(const MachineInstr &MI) {
619 MCSymbol *Label = MI.getOperand(0).getMCSymbol();
621 if (MAI->getExceptionHandlingType() != ExceptionHandling::DwarfCFI)
624 if (needsCFIMoves() == CFI_M_None)
627 if (MMI->getCompactUnwindEncoding() != 0)
628 OutStreamer.EmitCompactUnwindEncoding(MMI->getCompactUnwindEncoding());
630 MachineModuleInfo &MMI = MF->getMMI();
631 std::vector<MachineMove> &Moves = MMI.getFrameMoves();
632 bool FoundOne = false;
634 for (std::vector<MachineMove>::iterator I = Moves.begin(),
635 E = Moves.end(); I != E; ++I) {
636 if (I->getLabel() == Label) {
637 EmitCFIFrameMove(*I);
644 /// EmitFunctionBody - This method emits the body and trailer for a
646 void AsmPrinter::EmitFunctionBody() {
647 // Emit target-specific gunk before the function body.
648 EmitFunctionBodyStart();
650 bool ShouldPrintDebugScopes = DD && MMI->hasDebugInfo();
652 // Print out code for the function.
653 bool HasAnyRealCode = false;
654 const MachineInstr *LastMI = 0;
655 for (MachineFunction::const_iterator I = MF->begin(), E = MF->end();
657 // Print a label for the basic block.
658 EmitBasicBlockStart(I);
659 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
663 // Print the assembly for the instruction.
664 if (!II->isLabel() && !II->isImplicitDef() && !II->isKill() &&
665 !II->isDebugValue()) {
666 HasAnyRealCode = true;
670 if (ShouldPrintDebugScopes) {
671 NamedRegionTimer T(DbgTimerName, DWARFGroupName, TimePassesIsEnabled);
672 DD->beginInstruction(II);
676 emitComments(*II, OutStreamer.GetCommentOS());
678 switch (II->getOpcode()) {
679 case TargetOpcode::PROLOG_LABEL:
680 emitPrologLabel(*II);
683 case TargetOpcode::EH_LABEL:
684 case TargetOpcode::GC_LABEL:
685 OutStreamer.EmitLabel(II->getOperand(0).getMCSymbol());
687 case TargetOpcode::INLINEASM:
690 case TargetOpcode::DBG_VALUE:
692 if (!emitDebugValueComment(II, *this))
696 case TargetOpcode::IMPLICIT_DEF:
697 if (isVerbose()) emitImplicitDef(II, *this);
699 case TargetOpcode::KILL:
700 if (isVerbose()) emitKill(II, *this);
703 if (!TM.hasMCUseLoc())
704 MCLineEntry::Make(&OutStreamer, getCurrentSection());
710 if (ShouldPrintDebugScopes) {
711 NamedRegionTimer T(DbgTimerName, DWARFGroupName, TimePassesIsEnabled);
712 DD->endInstruction(II);
717 // If the last instruction was a prolog label, then we have a situation where
718 // we emitted a prolog but no function body. This results in the ending prolog
719 // label equaling the end of function label and an invalid "row" in the
720 // FDE. We need to emit a noop in this situation so that the FDE's rows are
722 bool RequiresNoop = LastMI && LastMI->isPrologLabel();
724 // If the function is empty and the object file uses .subsections_via_symbols,
725 // then we need to emit *something* to the function body to prevent the
726 // labels from collapsing together. Just emit a noop.
727 if ((MAI->hasSubsectionsViaSymbols() && !HasAnyRealCode) || RequiresNoop) {
729 TM.getInstrInfo()->getNoopForMachoTarget(Noop);
730 if (Noop.getOpcode()) {
731 OutStreamer.AddComment("avoids zero-length function");
732 OutStreamer.EmitInstruction(Noop);
733 } else // Target not mc-ized yet.
734 OutStreamer.EmitRawText(StringRef("\tnop\n"));
737 const Function *F = MF->getFunction();
738 for (Function::const_iterator i = F->begin(), e = F->end(); i != e; ++i) {
739 const BasicBlock *BB = i;
740 if (!BB->hasAddressTaken())
742 MCSymbol *Sym = GetBlockAddressSymbol(BB);
743 if (Sym->isDefined())
745 OutStreamer.AddComment("Address of block that was removed by CodeGen");
746 OutStreamer.EmitLabel(Sym);
749 // Emit target-specific gunk after the function body.
750 EmitFunctionBodyEnd();
752 // If the target wants a .size directive for the size of the function, emit
754 if (MAI->hasDotTypeDotSizeDirective()) {
755 // Create a symbol for the end of function, so we can get the size as
756 // difference between the function label and the temp label.
757 MCSymbol *FnEndLabel = OutContext.CreateTempSymbol();
758 OutStreamer.EmitLabel(FnEndLabel);
760 const MCExpr *SizeExp =
761 MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(FnEndLabel, OutContext),
762 MCSymbolRefExpr::Create(CurrentFnSymForSize,
765 OutStreamer.EmitELFSize(CurrentFnSym, SizeExp);
768 // Emit post-function debug information.
770 NamedRegionTimer T(DbgTimerName, DWARFGroupName, TimePassesIsEnabled);
774 NamedRegionTimer T(EHTimerName, DWARFGroupName, TimePassesIsEnabled);
779 // Print out jump tables referenced by the function.
782 OutStreamer.AddBlankLine();
785 /// getDebugValueLocation - Get location information encoded by DBG_VALUE
787 MachineLocation AsmPrinter::
788 getDebugValueLocation(const MachineInstr *MI) const {
789 // Target specific DBG_VALUE instructions are handled by each target.
790 return MachineLocation();
793 /// EmitDwarfRegOp - Emit dwarf register operation.
794 void AsmPrinter::EmitDwarfRegOp(const MachineLocation &MLoc) const {
795 const TargetRegisterInfo *TRI = TM.getRegisterInfo();
796 int Reg = TRI->getDwarfRegNum(MLoc.getReg(), false);
798 for (MCSuperRegIterator SR(MLoc.getReg(), TRI); SR.isValid() && Reg < 0;
800 Reg = TRI->getDwarfRegNum(*SR, false);
801 // FIXME: Get the bit range this register uses of the superregister
802 // so that we can produce a DW_OP_bit_piece
805 // FIXME: Handle cases like a super register being encoded as
806 // DW_OP_reg 32 DW_OP_piece 4 DW_OP_reg 33
808 // FIXME: We have no reasonable way of handling errors in here. The
809 // caller might be in the middle of an dwarf expression. We should
810 // probably assert that Reg >= 0 once debug info generation is more mature.
812 if (int Offset = MLoc.getOffset()) {
814 OutStreamer.AddComment(
815 dwarf::OperationEncodingString(dwarf::DW_OP_breg0 + Reg));
816 EmitInt8(dwarf::DW_OP_breg0 + Reg);
818 OutStreamer.AddComment("DW_OP_bregx");
819 EmitInt8(dwarf::DW_OP_bregx);
820 OutStreamer.AddComment(Twine(Reg));
826 OutStreamer.AddComment(
827 dwarf::OperationEncodingString(dwarf::DW_OP_reg0 + Reg));
828 EmitInt8(dwarf::DW_OP_reg0 + Reg);
830 OutStreamer.AddComment("DW_OP_regx");
831 EmitInt8(dwarf::DW_OP_regx);
832 OutStreamer.AddComment(Twine(Reg));
837 // FIXME: Produce a DW_OP_bit_piece if we used a superregister
840 bool AsmPrinter::doFinalization(Module &M) {
841 // Emit global variables.
842 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
844 EmitGlobalVariable(I);
846 // Emit visibility info for declarations
847 for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I) {
848 const Function &F = *I;
849 if (!F.isDeclaration())
851 GlobalValue::VisibilityTypes V = F.getVisibility();
852 if (V == GlobalValue::DefaultVisibility)
855 MCSymbol *Name = Mang->getSymbol(&F);
856 EmitVisibility(Name, V, false);
859 // Emit module flags.
860 SmallVector<Module::ModuleFlagEntry, 8> ModuleFlags;
861 M.getModuleFlagsMetadata(ModuleFlags);
862 if (!ModuleFlags.empty())
863 getObjFileLowering().emitModuleFlags(OutStreamer, ModuleFlags, Mang, TM);
865 // Finalize debug and EH information.
868 NamedRegionTimer T(EHTimerName, DWARFGroupName, TimePassesIsEnabled);
875 NamedRegionTimer T(DbgTimerName, DWARFGroupName, TimePassesIsEnabled);
881 // If the target wants to know about weak references, print them all.
882 if (MAI->getWeakRefDirective()) {
883 // FIXME: This is not lazy, it would be nice to only print weak references
884 // to stuff that is actually used. Note that doing so would require targets
885 // to notice uses in operands (due to constant exprs etc). This should
886 // happen with the MC stuff eventually.
888 // Print out module-level global variables here.
889 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
891 if (!I->hasExternalWeakLinkage()) continue;
892 OutStreamer.EmitSymbolAttribute(Mang->getSymbol(I), MCSA_WeakReference);
895 for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I) {
896 if (!I->hasExternalWeakLinkage()) continue;
897 OutStreamer.EmitSymbolAttribute(Mang->getSymbol(I), MCSA_WeakReference);
901 if (MAI->hasSetDirective()) {
902 OutStreamer.AddBlankLine();
903 for (Module::const_alias_iterator I = M.alias_begin(), E = M.alias_end();
905 MCSymbol *Name = Mang->getSymbol(I);
907 const GlobalValue *GV = I->getAliasedGlobal();
908 MCSymbol *Target = Mang->getSymbol(GV);
910 if (I->hasExternalLinkage() || !MAI->getWeakRefDirective())
911 OutStreamer.EmitSymbolAttribute(Name, MCSA_Global);
912 else if (I->hasWeakLinkage())
913 OutStreamer.EmitSymbolAttribute(Name, MCSA_WeakReference);
915 assert(I->hasLocalLinkage() && "Invalid alias linkage");
917 EmitVisibility(Name, I->getVisibility());
919 // Emit the directives as assignments aka .set:
920 OutStreamer.EmitAssignment(Name,
921 MCSymbolRefExpr::Create(Target, OutContext));
925 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
926 assert(MI && "AsmPrinter didn't require GCModuleInfo?");
927 for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; )
928 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*--I))
929 MP->finishAssembly(*this);
931 // If we don't have any trampolines, then we don't require stack memory
932 // to be executable. Some targets have a directive to declare this.
933 Function *InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline");
934 if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty())
935 if (const MCSection *S = MAI->getNonexecutableStackSection(OutContext))
936 OutStreamer.SwitchSection(S);
938 // Allow the target to emit any magic that it wants at the end of the file,
939 // after everything else has gone out.
942 delete Mang; Mang = 0;
945 OutStreamer.Finish();
949 void AsmPrinter::SetupMachineFunction(MachineFunction &MF) {
951 // Get the function symbol.
952 CurrentFnSym = Mang->getSymbol(MF.getFunction());
953 CurrentFnSymForSize = CurrentFnSym;
956 LI = &getAnalysis<MachineLoopInfo>();
960 // SectionCPs - Keep track the alignment, constpool entries per Section.
964 SmallVector<unsigned, 4> CPEs;
965 SectionCPs(const MCSection *s, unsigned a) : S(s), Alignment(a) {}
969 /// EmitConstantPool - Print to the current output stream assembly
970 /// representations of the constants in the constant pool MCP. This is
971 /// used to print out constants which have been "spilled to memory" by
972 /// the code generator.
974 void AsmPrinter::EmitConstantPool() {
975 const MachineConstantPool *MCP = MF->getConstantPool();
976 const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
977 if (CP.empty()) return;
979 // Calculate sections for constant pool entries. We collect entries to go into
980 // the same section together to reduce amount of section switch statements.
981 SmallVector<SectionCPs, 4> CPSections;
982 for (unsigned i = 0, e = CP.size(); i != e; ++i) {
983 const MachineConstantPoolEntry &CPE = CP[i];
984 unsigned Align = CPE.getAlignment();
987 switch (CPE.getRelocationInfo()) {
988 default: llvm_unreachable("Unknown section kind");
989 case 2: Kind = SectionKind::getReadOnlyWithRel(); break;
991 Kind = SectionKind::getReadOnlyWithRelLocal();
994 switch (TM.getDataLayout()->getTypeAllocSize(CPE.getType())) {
995 case 4: Kind = SectionKind::getMergeableConst4(); break;
996 case 8: Kind = SectionKind::getMergeableConst8(); break;
997 case 16: Kind = SectionKind::getMergeableConst16();break;
998 default: Kind = SectionKind::getMergeableConst(); break;
1002 const MCSection *S = getObjFileLowering().getSectionForConstant(Kind);
1004 // The number of sections are small, just do a linear search from the
1005 // last section to the first.
1007 unsigned SecIdx = CPSections.size();
1008 while (SecIdx != 0) {
1009 if (CPSections[--SecIdx].S == S) {
1015 SecIdx = CPSections.size();
1016 CPSections.push_back(SectionCPs(S, Align));
1019 if (Align > CPSections[SecIdx].Alignment)
1020 CPSections[SecIdx].Alignment = Align;
1021 CPSections[SecIdx].CPEs.push_back(i);
1024 // Now print stuff into the calculated sections.
1025 for (unsigned i = 0, e = CPSections.size(); i != e; ++i) {
1026 OutStreamer.SwitchSection(CPSections[i].S);
1027 EmitAlignment(Log2_32(CPSections[i].Alignment));
1029 unsigned Offset = 0;
1030 for (unsigned j = 0, ee = CPSections[i].CPEs.size(); j != ee; ++j) {
1031 unsigned CPI = CPSections[i].CPEs[j];
1032 MachineConstantPoolEntry CPE = CP[CPI];
1034 // Emit inter-object padding for alignment.
1035 unsigned AlignMask = CPE.getAlignment() - 1;
1036 unsigned NewOffset = (Offset + AlignMask) & ~AlignMask;
1037 OutStreamer.EmitFill(NewOffset - Offset, 0/*fillval*/, 0/*addrspace*/);
1039 Type *Ty = CPE.getType();
1040 Offset = NewOffset + TM.getDataLayout()->getTypeAllocSize(Ty);
1041 OutStreamer.EmitLabel(GetCPISymbol(CPI));
1043 if (CPE.isMachineConstantPoolEntry())
1044 EmitMachineConstantPoolValue(CPE.Val.MachineCPVal);
1046 EmitGlobalConstant(CPE.Val.ConstVal);
1051 /// EmitJumpTableInfo - Print assembly representations of the jump tables used
1052 /// by the current function to the current output stream.
1054 void AsmPrinter::EmitJumpTableInfo() {
1055 const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo();
1056 if (MJTI == 0) return;
1057 if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_Inline) return;
1058 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
1059 if (JT.empty()) return;
1061 // Pick the directive to use to print the jump table entries, and switch to
1062 // the appropriate section.
1063 const Function *F = MF->getFunction();
1064 bool JTInDiffSection = false;
1065 if (// In PIC mode, we need to emit the jump table to the same section as the
1066 // function body itself, otherwise the label differences won't make sense.
1067 // FIXME: Need a better predicate for this: what about custom entries?
1068 MJTI->getEntryKind() == MachineJumpTableInfo::EK_LabelDifference32 ||
1069 // We should also do if the section name is NULL or function is declared
1070 // in discardable section
1071 // FIXME: this isn't the right predicate, should be based on the MCSection
1072 // for the function.
1073 F->isWeakForLinker()) {
1074 OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F,Mang,TM));
1076 // Otherwise, drop it in the readonly section.
1077 const MCSection *ReadOnlySection =
1078 getObjFileLowering().getSectionForConstant(SectionKind::getReadOnly());
1079 OutStreamer.SwitchSection(ReadOnlySection);
1080 JTInDiffSection = true;
1083 EmitAlignment(Log2_32(MJTI->getEntryAlignment(*TM.getDataLayout())));
1085 // Jump tables in code sections are marked with a data_region directive
1086 // where that's supported.
1087 if (!JTInDiffSection)
1088 OutStreamer.EmitDataRegion(MCDR_DataRegionJT32);
1090 for (unsigned JTI = 0, e = JT.size(); JTI != e; ++JTI) {
1091 const std::vector<MachineBasicBlock*> &JTBBs = JT[JTI].MBBs;
1093 // If this jump table was deleted, ignore it.
1094 if (JTBBs.empty()) continue;
1096 // For the EK_LabelDifference32 entry, if the target supports .set, emit a
1097 // .set directive for each unique entry. This reduces the number of
1098 // relocations the assembler will generate for the jump table.
1099 if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_LabelDifference32 &&
1100 MAI->hasSetDirective()) {
1101 SmallPtrSet<const MachineBasicBlock*, 16> EmittedSets;
1102 const TargetLowering *TLI = TM.getTargetLowering();
1103 const MCExpr *Base = TLI->getPICJumpTableRelocBaseExpr(MF,JTI,OutContext);
1104 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
1105 const MachineBasicBlock *MBB = JTBBs[ii];
1106 if (!EmittedSets.insert(MBB)) continue;
1108 // .set LJTSet, LBB32-base
1110 MCSymbolRefExpr::Create(MBB->getSymbol(), OutContext);
1111 OutStreamer.EmitAssignment(GetJTSetSymbol(JTI, MBB->getNumber()),
1112 MCBinaryExpr::CreateSub(LHS, Base, OutContext));
1116 // On some targets (e.g. Darwin) we want to emit two consecutive labels
1117 // before each jump table. The first label is never referenced, but tells
1118 // the assembler and linker the extents of the jump table object. The
1119 // second label is actually referenced by the code.
1120 if (JTInDiffSection && MAI->getLinkerPrivateGlobalPrefix()[0])
1121 // FIXME: This doesn't have to have any specific name, just any randomly
1122 // named and numbered 'l' label would work. Simplify GetJTISymbol.
1123 OutStreamer.EmitLabel(GetJTISymbol(JTI, true));
1125 OutStreamer.EmitLabel(GetJTISymbol(JTI));
1127 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
1128 EmitJumpTableEntry(MJTI, JTBBs[ii], JTI);
1130 if (!JTInDiffSection)
1131 OutStreamer.EmitDataRegion(MCDR_DataRegionEnd);
1134 /// EmitJumpTableEntry - Emit a jump table entry for the specified MBB to the
1136 void AsmPrinter::EmitJumpTableEntry(const MachineJumpTableInfo *MJTI,
1137 const MachineBasicBlock *MBB,
1138 unsigned UID) const {
1139 assert(MBB && MBB->getNumber() >= 0 && "Invalid basic block");
1140 const MCExpr *Value = 0;
1141 switch (MJTI->getEntryKind()) {
1142 case MachineJumpTableInfo::EK_Inline:
1143 llvm_unreachable("Cannot emit EK_Inline jump table entry");
1144 case MachineJumpTableInfo::EK_Custom32:
1145 Value = TM.getTargetLowering()->LowerCustomJumpTableEntry(MJTI, MBB, UID,
1148 case MachineJumpTableInfo::EK_BlockAddress:
1149 // EK_BlockAddress - Each entry is a plain address of block, e.g.:
1151 Value = MCSymbolRefExpr::Create(MBB->getSymbol(), OutContext);
1153 case MachineJumpTableInfo::EK_GPRel32BlockAddress: {
1154 // EK_GPRel32BlockAddress - Each entry is an address of block, encoded
1155 // with a relocation as gp-relative, e.g.:
1157 MCSymbol *MBBSym = MBB->getSymbol();
1158 OutStreamer.EmitGPRel32Value(MCSymbolRefExpr::Create(MBBSym, OutContext));
1162 case MachineJumpTableInfo::EK_GPRel64BlockAddress: {
1163 // EK_GPRel64BlockAddress - Each entry is an address of block, encoded
1164 // with a relocation as gp-relative, e.g.:
1166 MCSymbol *MBBSym = MBB->getSymbol();
1167 OutStreamer.EmitGPRel64Value(MCSymbolRefExpr::Create(MBBSym, OutContext));
1171 case MachineJumpTableInfo::EK_LabelDifference32: {
1172 // EK_LabelDifference32 - Each entry is the address of the block minus
1173 // the address of the jump table. This is used for PIC jump tables where
1174 // gprel32 is not supported. e.g.:
1175 // .word LBB123 - LJTI1_2
1176 // If the .set directive is supported, this is emitted as:
1177 // .set L4_5_set_123, LBB123 - LJTI1_2
1178 // .word L4_5_set_123
1180 // If we have emitted set directives for the jump table entries, print
1181 // them rather than the entries themselves. If we're emitting PIC, then
1182 // emit the table entries as differences between two text section labels.
1183 if (MAI->hasSetDirective()) {
1184 // If we used .set, reference the .set's symbol.
1185 Value = MCSymbolRefExpr::Create(GetJTSetSymbol(UID, MBB->getNumber()),
1189 // Otherwise, use the difference as the jump table entry.
1190 Value = MCSymbolRefExpr::Create(MBB->getSymbol(), OutContext);
1191 const MCExpr *JTI = MCSymbolRefExpr::Create(GetJTISymbol(UID), OutContext);
1192 Value = MCBinaryExpr::CreateSub(Value, JTI, OutContext);
1197 assert(Value && "Unknown entry kind!");
1199 unsigned EntrySize = MJTI->getEntrySize(*TM.getDataLayout());
1200 OutStreamer.EmitValue(Value, EntrySize, /*addrspace*/0);
1204 /// EmitSpecialLLVMGlobal - Check to see if the specified global is a
1205 /// special global used by LLVM. If so, emit it and return true, otherwise
1206 /// do nothing and return false.
1207 bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
1208 if (GV->getName() == "llvm.used") {
1209 if (MAI->hasNoDeadStrip()) // No need to emit this at all.
1210 EmitLLVMUsedList(GV->getInitializer());
1214 // Ignore debug and non-emitted data. This handles llvm.compiler.used.
1215 if (GV->getSection() == "llvm.metadata" ||
1216 GV->hasAvailableExternallyLinkage())
1219 if (!GV->hasAppendingLinkage()) return false;
1221 assert(GV->hasInitializer() && "Not a special LLVM global!");
1223 if (GV->getName() == "llvm.global_ctors") {
1224 EmitXXStructorList(GV->getInitializer(), /* isCtor */ true);
1226 if (TM.getRelocationModel() == Reloc::Static &&
1227 MAI->hasStaticCtorDtorReferenceInStaticMode()) {
1228 StringRef Sym(".constructors_used");
1229 OutStreamer.EmitSymbolAttribute(OutContext.GetOrCreateSymbol(Sym),
1235 if (GV->getName() == "llvm.global_dtors") {
1236 EmitXXStructorList(GV->getInitializer(), /* isCtor */ false);
1238 if (TM.getRelocationModel() == Reloc::Static &&
1239 MAI->hasStaticCtorDtorReferenceInStaticMode()) {
1240 StringRef Sym(".destructors_used");
1241 OutStreamer.EmitSymbolAttribute(OutContext.GetOrCreateSymbol(Sym),
1250 /// EmitLLVMUsedList - For targets that define a MAI::UsedDirective, mark each
1251 /// global in the specified llvm.used list for which emitUsedDirectiveFor
1252 /// is true, as being used with this directive.
1253 void AsmPrinter::EmitLLVMUsedList(const Constant *List) {
1254 // Should be an array of 'i8*'.
1255 const ConstantArray *InitList = dyn_cast<ConstantArray>(List);
1256 if (InitList == 0) return;
1258 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
1259 const GlobalValue *GV =
1260 dyn_cast<GlobalValue>(InitList->getOperand(i)->stripPointerCasts());
1261 if (GV && getObjFileLowering().shouldEmitUsedDirectiveFor(GV, Mang))
1262 OutStreamer.EmitSymbolAttribute(Mang->getSymbol(GV), MCSA_NoDeadStrip);
1266 typedef std::pair<unsigned, Constant*> Structor;
1268 static bool priority_order(const Structor& lhs, const Structor& rhs) {
1269 return lhs.first < rhs.first;
1272 /// EmitXXStructorList - Emit the ctor or dtor list taking into account the init
1274 void AsmPrinter::EmitXXStructorList(const Constant *List, bool isCtor) {
1275 // Should be an array of '{ int, void ()* }' structs. The first value is the
1277 if (!isa<ConstantArray>(List)) return;
1279 // Sanity check the structors list.
1280 const ConstantArray *InitList = dyn_cast<ConstantArray>(List);
1281 if (!InitList) return; // Not an array!
1282 StructType *ETy = dyn_cast<StructType>(InitList->getType()->getElementType());
1283 if (!ETy || ETy->getNumElements() != 2) return; // Not an array of pairs!
1284 if (!isa<IntegerType>(ETy->getTypeAtIndex(0U)) ||
1285 !isa<PointerType>(ETy->getTypeAtIndex(1U))) return; // Not (int, ptr).
1287 // Gather the structors in a form that's convenient for sorting by priority.
1288 SmallVector<Structor, 8> Structors;
1289 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
1290 ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i));
1291 if (!CS) continue; // Malformed.
1292 if (CS->getOperand(1)->isNullValue())
1293 break; // Found a null terminator, skip the rest.
1294 ConstantInt *Priority = dyn_cast<ConstantInt>(CS->getOperand(0));
1295 if (!Priority) continue; // Malformed.
1296 Structors.push_back(std::make_pair(Priority->getLimitedValue(65535),
1297 CS->getOperand(1)));
1300 // Emit the function pointers in the target-specific order
1301 const DataLayout *TD = TM.getDataLayout();
1302 unsigned Align = Log2_32(TD->getPointerPrefAlignment());
1303 std::stable_sort(Structors.begin(), Structors.end(), priority_order);
1304 for (unsigned i = 0, e = Structors.size(); i != e; ++i) {
1305 const MCSection *OutputSection =
1307 getObjFileLowering().getStaticCtorSection(Structors[i].first) :
1308 getObjFileLowering().getStaticDtorSection(Structors[i].first));
1309 OutStreamer.SwitchSection(OutputSection);
1310 if (OutStreamer.getCurrentSection() != OutStreamer.getPreviousSection())
1311 EmitAlignment(Align);
1312 EmitXXStructor(Structors[i].second);
1316 //===--------------------------------------------------------------------===//
1317 // Emission and print routines
1320 /// EmitInt8 - Emit a byte directive and value.
1322 void AsmPrinter::EmitInt8(int Value) const {
1323 OutStreamer.EmitIntValue(Value, 1, 0/*addrspace*/);
1326 /// EmitInt16 - Emit a short directive and value.
1328 void AsmPrinter::EmitInt16(int Value) const {
1329 OutStreamer.EmitIntValue(Value, 2, 0/*addrspace*/);
1332 /// EmitInt32 - Emit a long directive and value.
1334 void AsmPrinter::EmitInt32(int Value) const {
1335 OutStreamer.EmitIntValue(Value, 4, 0/*addrspace*/);
1338 /// EmitLabelDifference - Emit something like ".long Hi-Lo" where the size
1339 /// in bytes of the directive is specified by Size and Hi/Lo specify the
1340 /// labels. This implicitly uses .set if it is available.
1341 void AsmPrinter::EmitLabelDifference(const MCSymbol *Hi, const MCSymbol *Lo,
1342 unsigned Size) const {
1343 // Get the Hi-Lo expression.
1344 const MCExpr *Diff =
1345 MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(Hi, OutContext),
1346 MCSymbolRefExpr::Create(Lo, OutContext),
1349 if (!MAI->hasSetDirective()) {
1350 OutStreamer.EmitValue(Diff, Size, 0/*AddrSpace*/);
1354 // Otherwise, emit with .set (aka assignment).
1355 MCSymbol *SetLabel = GetTempSymbol("set", SetCounter++);
1356 OutStreamer.EmitAssignment(SetLabel, Diff);
1357 OutStreamer.EmitSymbolValue(SetLabel, Size, 0/*AddrSpace*/);
1360 /// EmitLabelOffsetDifference - Emit something like ".long Hi+Offset-Lo"
1361 /// where the size in bytes of the directive is specified by Size and Hi/Lo
1362 /// specify the labels. This implicitly uses .set if it is available.
1363 void AsmPrinter::EmitLabelOffsetDifference(const MCSymbol *Hi, uint64_t Offset,
1364 const MCSymbol *Lo, unsigned Size)
1367 // Emit Hi+Offset - Lo
1368 // Get the Hi+Offset expression.
1369 const MCExpr *Plus =
1370 MCBinaryExpr::CreateAdd(MCSymbolRefExpr::Create(Hi, OutContext),
1371 MCConstantExpr::Create(Offset, OutContext),
1374 // Get the Hi+Offset-Lo expression.
1375 const MCExpr *Diff =
1376 MCBinaryExpr::CreateSub(Plus,
1377 MCSymbolRefExpr::Create(Lo, OutContext),
1380 if (!MAI->hasSetDirective())
1381 OutStreamer.EmitValue(Diff, 4, 0/*AddrSpace*/);
1383 // Otherwise, emit with .set (aka assignment).
1384 MCSymbol *SetLabel = GetTempSymbol("set", SetCounter++);
1385 OutStreamer.EmitAssignment(SetLabel, Diff);
1386 OutStreamer.EmitSymbolValue(SetLabel, 4, 0/*AddrSpace*/);
1390 /// EmitLabelPlusOffset - Emit something like ".long Label+Offset"
1391 /// where the size in bytes of the directive is specified by Size and Label
1392 /// specifies the label. This implicitly uses .set if it is available.
1393 void AsmPrinter::EmitLabelPlusOffset(const MCSymbol *Label, uint64_t Offset,
1397 // Emit Label+Offset (or just Label if Offset is zero)
1398 const MCExpr *Expr = MCSymbolRefExpr::Create(Label, OutContext);
1400 Expr = MCBinaryExpr::CreateAdd(Expr,
1401 MCConstantExpr::Create(Offset, OutContext),
1404 OutStreamer.EmitValue(Expr, Size, 0/*AddrSpace*/);
1408 //===----------------------------------------------------------------------===//
1410 // EmitAlignment - Emit an alignment directive to the specified power of
1411 // two boundary. For example, if you pass in 3 here, you will get an 8
1412 // byte alignment. If a global value is specified, and if that global has
1413 // an explicit alignment requested, it will override the alignment request
1414 // if required for correctness.
1416 void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV) const {
1417 if (GV) NumBits = getGVAlignmentLog2(GV, *TM.getDataLayout(), NumBits);
1419 if (NumBits == 0) return; // 1-byte aligned: no need to emit alignment.
1421 if (getCurrentSection()->getKind().isText())
1422 OutStreamer.EmitCodeAlignment(1 << NumBits);
1424 OutStreamer.EmitValueToAlignment(1 << NumBits, 0, 1, 0);
1427 //===----------------------------------------------------------------------===//
1428 // Constant emission.
1429 //===----------------------------------------------------------------------===//
1431 /// lowerConstant - Lower the specified LLVM Constant to an MCExpr.
1433 static const MCExpr *lowerConstant(const Constant *CV, AsmPrinter &AP) {
1434 MCContext &Ctx = AP.OutContext;
1436 if (CV->isNullValue() || isa<UndefValue>(CV))
1437 return MCConstantExpr::Create(0, Ctx);
1439 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV))
1440 return MCConstantExpr::Create(CI->getZExtValue(), Ctx);
1442 if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV))
1443 return MCSymbolRefExpr::Create(AP.Mang->getSymbol(GV), Ctx);
1445 if (const BlockAddress *BA = dyn_cast<BlockAddress>(CV))
1446 return MCSymbolRefExpr::Create(AP.GetBlockAddressSymbol(BA), Ctx);
1448 const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV);
1450 llvm_unreachable("Unknown constant value to lower!");
1453 switch (CE->getOpcode()) {
1455 // If the code isn't optimized, there may be outstanding folding
1456 // opportunities. Attempt to fold the expression using DataLayout as a
1457 // last resort before giving up.
1459 ConstantFoldConstantExpression(CE, AP.TM.getDataLayout()))
1461 return lowerConstant(C, AP);
1463 // Otherwise report the problem to the user.
1466 raw_string_ostream OS(S);
1467 OS << "Unsupported expression in static initializer: ";
1468 WriteAsOperand(OS, CE, /*PrintType=*/false,
1469 !AP.MF ? 0 : AP.MF->getFunction()->getParent());
1470 report_fatal_error(OS.str());
1472 case Instruction::GetElementPtr: {
1473 const DataLayout &TD = *AP.TM.getDataLayout();
1474 // Generate a symbolic expression for the byte address
1475 const Constant *PtrVal = CE->getOperand(0);
1476 SmallVector<Value*, 8> IdxVec(CE->op_begin()+1, CE->op_end());
1477 int64_t Offset = TD.getIndexedOffset(PtrVal->getType(), IdxVec);
1479 const MCExpr *Base = lowerConstant(CE->getOperand(0), AP);
1483 // Truncate/sext the offset to the pointer size.
1484 unsigned Width = TD.getPointerSizeInBits();
1486 Offset = SignExtend64(Offset, Width);
1488 return MCBinaryExpr::CreateAdd(Base, MCConstantExpr::Create(Offset, Ctx),
1492 case Instruction::Trunc:
1493 // We emit the value and depend on the assembler to truncate the generated
1494 // expression properly. This is important for differences between
1495 // blockaddress labels. Since the two labels are in the same function, it
1496 // is reasonable to treat their delta as a 32-bit value.
1498 case Instruction::BitCast:
1499 return lowerConstant(CE->getOperand(0), AP);
1501 case Instruction::IntToPtr: {
1502 const DataLayout &TD = *AP.TM.getDataLayout();
1503 // Handle casts to pointers by changing them into casts to the appropriate
1504 // integer type. This promotes constant folding and simplifies this code.
1505 Constant *Op = CE->getOperand(0);
1506 Op = ConstantExpr::getIntegerCast(Op, TD.getIntPtrType(CV->getContext()),
1508 return lowerConstant(Op, AP);
1511 case Instruction::PtrToInt: {
1512 const DataLayout &TD = *AP.TM.getDataLayout();
1513 // Support only foldable casts to/from pointers that can be eliminated by
1514 // changing the pointer to the appropriately sized integer type.
1515 Constant *Op = CE->getOperand(0);
1516 Type *Ty = CE->getType();
1518 const MCExpr *OpExpr = lowerConstant(Op, AP);
1520 // We can emit the pointer value into this slot if the slot is an
1521 // integer slot equal to the size of the pointer.
1522 if (TD.getTypeAllocSize(Ty) == TD.getTypeAllocSize(Op->getType()))
1525 // Otherwise the pointer is smaller than the resultant integer, mask off
1526 // the high bits so we are sure to get a proper truncation if the input is
1528 unsigned InBits = TD.getTypeAllocSizeInBits(Op->getType());
1529 const MCExpr *MaskExpr = MCConstantExpr::Create(~0ULL >> (64-InBits), Ctx);
1530 return MCBinaryExpr::CreateAnd(OpExpr, MaskExpr, Ctx);
1533 // The MC library also has a right-shift operator, but it isn't consistently
1534 // signed or unsigned between different targets.
1535 case Instruction::Add:
1536 case Instruction::Sub:
1537 case Instruction::Mul:
1538 case Instruction::SDiv:
1539 case Instruction::SRem:
1540 case Instruction::Shl:
1541 case Instruction::And:
1542 case Instruction::Or:
1543 case Instruction::Xor: {
1544 const MCExpr *LHS = lowerConstant(CE->getOperand(0), AP);
1545 const MCExpr *RHS = lowerConstant(CE->getOperand(1), AP);
1546 switch (CE->getOpcode()) {
1547 default: llvm_unreachable("Unknown binary operator constant cast expr");
1548 case Instruction::Add: return MCBinaryExpr::CreateAdd(LHS, RHS, Ctx);
1549 case Instruction::Sub: return MCBinaryExpr::CreateSub(LHS, RHS, Ctx);
1550 case Instruction::Mul: return MCBinaryExpr::CreateMul(LHS, RHS, Ctx);
1551 case Instruction::SDiv: return MCBinaryExpr::CreateDiv(LHS, RHS, Ctx);
1552 case Instruction::SRem: return MCBinaryExpr::CreateMod(LHS, RHS, Ctx);
1553 case Instruction::Shl: return MCBinaryExpr::CreateShl(LHS, RHS, Ctx);
1554 case Instruction::And: return MCBinaryExpr::CreateAnd(LHS, RHS, Ctx);
1555 case Instruction::Or: return MCBinaryExpr::CreateOr (LHS, RHS, Ctx);
1556 case Instruction::Xor: return MCBinaryExpr::CreateXor(LHS, RHS, Ctx);
1562 static void emitGlobalConstantImpl(const Constant *C, unsigned AddrSpace,
1565 /// isRepeatedByteSequence - Determine whether the given value is
1566 /// composed of a repeated sequence of identical bytes and return the
1567 /// byte value. If it is not a repeated sequence, return -1.
1568 static int isRepeatedByteSequence(const ConstantDataSequential *V) {
1569 StringRef Data = V->getRawDataValues();
1570 assert(!Data.empty() && "Empty aggregates should be CAZ node");
1572 for (unsigned i = 1, e = Data.size(); i != e; ++i)
1573 if (Data[i] != C) return -1;
1574 return static_cast<uint8_t>(C); // Ensure 255 is not returned as -1.
1578 /// isRepeatedByteSequence - Determine whether the given value is
1579 /// composed of a repeated sequence of identical bytes and return the
1580 /// byte value. If it is not a repeated sequence, return -1.
1581 static int isRepeatedByteSequence(const Value *V, TargetMachine &TM) {
1583 if (const ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
1584 if (CI->getBitWidth() > 64) return -1;
1586 uint64_t Size = TM.getDataLayout()->getTypeAllocSize(V->getType());
1587 uint64_t Value = CI->getZExtValue();
1589 // Make sure the constant is at least 8 bits long and has a power
1590 // of 2 bit width. This guarantees the constant bit width is
1591 // always a multiple of 8 bits, avoiding issues with padding out
1592 // to Size and other such corner cases.
1593 if (CI->getBitWidth() < 8 || !isPowerOf2_64(CI->getBitWidth())) return -1;
1595 uint8_t Byte = static_cast<uint8_t>(Value);
1597 for (unsigned i = 1; i < Size; ++i) {
1599 if (static_cast<uint8_t>(Value) != Byte) return -1;
1603 if (const ConstantArray *CA = dyn_cast<ConstantArray>(V)) {
1604 // Make sure all array elements are sequences of the same repeated
1606 assert(CA->getNumOperands() != 0 && "Should be a CAZ");
1607 int Byte = isRepeatedByteSequence(CA->getOperand(0), TM);
1608 if (Byte == -1) return -1;
1610 for (unsigned i = 1, e = CA->getNumOperands(); i != e; ++i) {
1611 int ThisByte = isRepeatedByteSequence(CA->getOperand(i), TM);
1612 if (ThisByte == -1) return -1;
1613 if (Byte != ThisByte) return -1;
1618 if (const ConstantDataSequential *CDS = dyn_cast<ConstantDataSequential>(V))
1619 return isRepeatedByteSequence(CDS);
1624 static void emitGlobalConstantDataSequential(const ConstantDataSequential *CDS,
1625 unsigned AddrSpace,AsmPrinter &AP){
1627 // See if we can aggregate this into a .fill, if so, emit it as such.
1628 int Value = isRepeatedByteSequence(CDS, AP.TM);
1630 uint64_t Bytes = AP.TM.getDataLayout()->getTypeAllocSize(CDS->getType());
1631 // Don't emit a 1-byte object as a .fill.
1633 return AP.OutStreamer.EmitFill(Bytes, Value, AddrSpace);
1636 // If this can be emitted with .ascii/.asciz, emit it as such.
1637 if (CDS->isString())
1638 return AP.OutStreamer.EmitBytes(CDS->getAsString(), AddrSpace);
1640 // Otherwise, emit the values in successive locations.
1641 unsigned ElementByteSize = CDS->getElementByteSize();
1642 if (isa<IntegerType>(CDS->getElementType())) {
1643 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) {
1645 AP.OutStreamer.GetCommentOS() << format("0x%" PRIx64 "\n",
1646 CDS->getElementAsInteger(i));
1647 AP.OutStreamer.EmitIntValue(CDS->getElementAsInteger(i),
1648 ElementByteSize, AddrSpace);
1650 } else if (ElementByteSize == 4) {
1651 // FP Constants are printed as integer constants to avoid losing
1653 assert(CDS->getElementType()->isFloatTy());
1654 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) {
1660 F = CDS->getElementAsFloat(i);
1662 AP.OutStreamer.GetCommentOS() << "float " << F << '\n';
1663 AP.OutStreamer.EmitIntValue(I, 4, AddrSpace);
1666 assert(CDS->getElementType()->isDoubleTy());
1667 for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) {
1673 F = CDS->getElementAsDouble(i);
1675 AP.OutStreamer.GetCommentOS() << "double " << F << '\n';
1676 AP.OutStreamer.EmitIntValue(I, 8, AddrSpace);
1680 const DataLayout &TD = *AP.TM.getDataLayout();
1681 unsigned Size = TD.getTypeAllocSize(CDS->getType());
1682 unsigned EmittedSize = TD.getTypeAllocSize(CDS->getType()->getElementType()) *
1683 CDS->getNumElements();
1684 if (unsigned Padding = Size - EmittedSize)
1685 AP.OutStreamer.EmitZeros(Padding, AddrSpace);
1689 static void emitGlobalConstantArray(const ConstantArray *CA, unsigned AddrSpace,
1691 // See if we can aggregate some values. Make sure it can be
1692 // represented as a series of bytes of the constant value.
1693 int Value = isRepeatedByteSequence(CA, AP.TM);
1696 uint64_t Bytes = AP.TM.getDataLayout()->getTypeAllocSize(CA->getType());
1697 AP.OutStreamer.EmitFill(Bytes, Value, AddrSpace);
1700 for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i)
1701 emitGlobalConstantImpl(CA->getOperand(i), AddrSpace, AP);
1705 static void emitGlobalConstantVector(const ConstantVector *CV,
1706 unsigned AddrSpace, AsmPrinter &AP) {
1707 for (unsigned i = 0, e = CV->getType()->getNumElements(); i != e; ++i)
1708 emitGlobalConstantImpl(CV->getOperand(i), AddrSpace, AP);
1710 const DataLayout &TD = *AP.TM.getDataLayout();
1711 unsigned Size = TD.getTypeAllocSize(CV->getType());
1712 unsigned EmittedSize = TD.getTypeAllocSize(CV->getType()->getElementType()) *
1713 CV->getType()->getNumElements();
1714 if (unsigned Padding = Size - EmittedSize)
1715 AP.OutStreamer.EmitZeros(Padding, AddrSpace);
1718 static void emitGlobalConstantStruct(const ConstantStruct *CS,
1719 unsigned AddrSpace, AsmPrinter &AP) {
1720 // Print the fields in successive locations. Pad to align if needed!
1721 const DataLayout *TD = AP.TM.getDataLayout();
1722 unsigned Size = TD->getTypeAllocSize(CS->getType());
1723 const StructLayout *Layout = TD->getStructLayout(CS->getType());
1724 uint64_t SizeSoFar = 0;
1725 for (unsigned i = 0, e = CS->getNumOperands(); i != e; ++i) {
1726 const Constant *Field = CS->getOperand(i);
1728 // Check if padding is needed and insert one or more 0s.
1729 uint64_t FieldSize = TD->getTypeAllocSize(Field->getType());
1730 uint64_t PadSize = ((i == e-1 ? Size : Layout->getElementOffset(i+1))
1731 - Layout->getElementOffset(i)) - FieldSize;
1732 SizeSoFar += FieldSize + PadSize;
1734 // Now print the actual field value.
1735 emitGlobalConstantImpl(Field, AddrSpace, AP);
1737 // Insert padding - this may include padding to increase the size of the
1738 // current field up to the ABI size (if the struct is not packed) as well
1739 // as padding to ensure that the next field starts at the right offset.
1740 AP.OutStreamer.EmitZeros(PadSize, AddrSpace);
1742 assert(SizeSoFar == Layout->getSizeInBytes() &&
1743 "Layout of constant struct may be incorrect!");
1746 static void emitGlobalConstantFP(const ConstantFP *CFP, unsigned AddrSpace,
1748 if (CFP->getType()->isHalfTy()) {
1749 if (AP.isVerbose()) {
1750 SmallString<10> Str;
1751 CFP->getValueAPF().toString(Str);
1752 AP.OutStreamer.GetCommentOS() << "half " << Str << '\n';
1754 uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1755 AP.OutStreamer.EmitIntValue(Val, 2, AddrSpace);
1759 if (CFP->getType()->isFloatTy()) {
1760 if (AP.isVerbose()) {
1761 float Val = CFP->getValueAPF().convertToFloat();
1762 uint64_t IntVal = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1763 AP.OutStreamer.GetCommentOS() << "float " << Val << '\n'
1764 << " (" << format("0x%x", IntVal) << ")\n";
1766 uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1767 AP.OutStreamer.EmitIntValue(Val, 4, AddrSpace);
1771 // FP Constants are printed as integer constants to avoid losing
1773 if (CFP->getType()->isDoubleTy()) {
1774 if (AP.isVerbose()) {
1775 double Val = CFP->getValueAPF().convertToDouble();
1776 uint64_t IntVal = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1777 AP.OutStreamer.GetCommentOS() << "double " << Val << '\n'
1778 << " (" << format("0x%lx", IntVal) << ")\n";
1781 uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1782 AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace);
1786 if (CFP->getType()->isX86_FP80Ty()) {
1787 // all long double variants are printed as hex
1788 // API needed to prevent premature destruction
1789 APInt API = CFP->getValueAPF().bitcastToAPInt();
1790 const uint64_t *p = API.getRawData();
1791 if (AP.isVerbose()) {
1792 // Convert to double so we can print the approximate val as a comment.
1793 APFloat DoubleVal = CFP->getValueAPF();
1795 DoubleVal.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven,
1797 AP.OutStreamer.GetCommentOS() << "x86_fp80 ~= "
1798 << DoubleVal.convertToDouble() << '\n';
1801 if (AP.TM.getDataLayout()->isBigEndian()) {
1802 AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace);
1803 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1805 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1806 AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace);
1809 // Emit the tail padding for the long double.
1810 const DataLayout &TD = *AP.TM.getDataLayout();
1811 AP.OutStreamer.EmitZeros(TD.getTypeAllocSize(CFP->getType()) -
1812 TD.getTypeStoreSize(CFP->getType()), AddrSpace);
1816 assert(CFP->getType()->isPPC_FP128Ty() &&
1817 "Floating point constant type not handled");
1818 // All long double variants are printed as hex
1819 // API needed to prevent premature destruction.
1820 APInt API = CFP->getValueAPF().bitcastToAPInt();
1821 const uint64_t *p = API.getRawData();
1822 if (AP.TM.getDataLayout()->isBigEndian()) {
1823 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1824 AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace);
1826 AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace);
1827 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1831 static void emitGlobalConstantLargeInt(const ConstantInt *CI,
1832 unsigned AddrSpace, AsmPrinter &AP) {
1833 const DataLayout *TD = AP.TM.getDataLayout();
1834 unsigned BitWidth = CI->getBitWidth();
1835 assert((BitWidth & 63) == 0 && "only support multiples of 64-bits");
1837 // We don't expect assemblers to support integer data directives
1838 // for more than 64 bits, so we emit the data in at most 64-bit
1839 // quantities at a time.
1840 const uint64_t *RawData = CI->getValue().getRawData();
1841 for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) {
1842 uint64_t Val = TD->isBigEndian() ? RawData[e - i - 1] : RawData[i];
1843 AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace);
1847 static void emitGlobalConstantImpl(const Constant *CV, unsigned AddrSpace,
1849 const DataLayout *TD = AP.TM.getDataLayout();
1850 uint64_t Size = TD->getTypeAllocSize(CV->getType());
1851 if (isa<ConstantAggregateZero>(CV) || isa<UndefValue>(CV))
1852 return AP.OutStreamer.EmitZeros(Size, AddrSpace);
1854 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
1861 AP.OutStreamer.GetCommentOS() << format("0x%" PRIx64 "\n",
1862 CI->getZExtValue());
1863 AP.OutStreamer.EmitIntValue(CI->getZExtValue(), Size, AddrSpace);
1866 emitGlobalConstantLargeInt(CI, AddrSpace, AP);
1871 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV))
1872 return emitGlobalConstantFP(CFP, AddrSpace, AP);
1874 if (isa<ConstantPointerNull>(CV)) {
1875 AP.OutStreamer.EmitIntValue(0, Size, AddrSpace);
1879 if (const ConstantDataSequential *CDS = dyn_cast<ConstantDataSequential>(CV))
1880 return emitGlobalConstantDataSequential(CDS, AddrSpace, AP);
1882 if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV))
1883 return emitGlobalConstantArray(CVA, AddrSpace, AP);
1885 if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV))
1886 return emitGlobalConstantStruct(CVS, AddrSpace, AP);
1888 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) {
1889 // Look through bitcasts, which might not be able to be MCExpr'ized (e.g. of
1891 if (CE->getOpcode() == Instruction::BitCast)
1892 return emitGlobalConstantImpl(CE->getOperand(0), AddrSpace, AP);
1895 // If the constant expression's size is greater than 64-bits, then we have
1896 // to emit the value in chunks. Try to constant fold the value and emit it
1898 Constant *New = ConstantFoldConstantExpression(CE, TD);
1899 if (New && New != CE)
1900 return emitGlobalConstantImpl(New, AddrSpace, AP);
1904 if (const ConstantVector *V = dyn_cast<ConstantVector>(CV))
1905 return emitGlobalConstantVector(V, AddrSpace, AP);
1907 // Otherwise, it must be a ConstantExpr. Lower it to an MCExpr, then emit it
1908 // thread the streamer with EmitValue.
1909 AP.OutStreamer.EmitValue(lowerConstant(CV, AP), Size, AddrSpace);
1912 /// EmitGlobalConstant - Print a general LLVM constant to the .s file.
1913 void AsmPrinter::EmitGlobalConstant(const Constant *CV, unsigned AddrSpace) {
1914 uint64_t Size = TM.getDataLayout()->getTypeAllocSize(CV->getType());
1916 emitGlobalConstantImpl(CV, AddrSpace, *this);
1917 else if (MAI->hasSubsectionsViaSymbols()) {
1918 // If the global has zero size, emit a single byte so that two labels don't
1919 // look like they are at the same location.
1920 OutStreamer.EmitIntValue(0, 1, AddrSpace);
1924 void AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
1925 // Target doesn't support this yet!
1926 llvm_unreachable("Target does not support EmitMachineConstantPoolValue");
1929 void AsmPrinter::printOffset(int64_t Offset, raw_ostream &OS) const {
1931 OS << '+' << Offset;
1932 else if (Offset < 0)
1936 //===----------------------------------------------------------------------===//
1937 // Symbol Lowering Routines.
1938 //===----------------------------------------------------------------------===//
1940 /// GetTempSymbol - Return the MCSymbol corresponding to the assembler
1941 /// temporary label with the specified stem and unique ID.
1942 MCSymbol *AsmPrinter::GetTempSymbol(StringRef Name, unsigned ID) const {
1943 return OutContext.GetOrCreateSymbol(Twine(MAI->getPrivateGlobalPrefix()) +
1947 /// GetTempSymbol - Return an assembler temporary label with the specified
1949 MCSymbol *AsmPrinter::GetTempSymbol(StringRef Name) const {
1950 return OutContext.GetOrCreateSymbol(Twine(MAI->getPrivateGlobalPrefix())+
1955 MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BlockAddress *BA) const {
1956 return MMI->getAddrLabelSymbol(BA->getBasicBlock());
1959 MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BasicBlock *BB) const {
1960 return MMI->getAddrLabelSymbol(BB);
1963 /// GetCPISymbol - Return the symbol for the specified constant pool entry.
1964 MCSymbol *AsmPrinter::GetCPISymbol(unsigned CPID) const {
1965 return OutContext.GetOrCreateSymbol
1966 (Twine(MAI->getPrivateGlobalPrefix()) + "CPI" + Twine(getFunctionNumber())
1967 + "_" + Twine(CPID));
1970 /// GetJTISymbol - Return the symbol for the specified jump table entry.
1971 MCSymbol *AsmPrinter::GetJTISymbol(unsigned JTID, bool isLinkerPrivate) const {
1972 return MF->getJTISymbol(JTID, OutContext, isLinkerPrivate);
1975 /// GetJTSetSymbol - Return the symbol for the specified jump table .set
1976 /// FIXME: privatize to AsmPrinter.
1977 MCSymbol *AsmPrinter::GetJTSetSymbol(unsigned UID, unsigned MBBID) const {
1978 return OutContext.GetOrCreateSymbol
1979 (Twine(MAI->getPrivateGlobalPrefix()) + Twine(getFunctionNumber()) + "_" +
1980 Twine(UID) + "_set_" + Twine(MBBID));
1983 /// GetSymbolWithGlobalValueBase - Return the MCSymbol for a symbol with
1984 /// global value name as its base, with the specified suffix, and where the
1985 /// symbol is forced to have private linkage if ForcePrivate is true.
1986 MCSymbol *AsmPrinter::GetSymbolWithGlobalValueBase(const GlobalValue *GV,
1988 bool ForcePrivate) const {
1989 SmallString<60> NameStr;
1990 Mang->getNameWithPrefix(NameStr, GV, ForcePrivate);
1991 NameStr.append(Suffix.begin(), Suffix.end());
1992 return OutContext.GetOrCreateSymbol(NameStr.str());
1995 /// GetExternalSymbolSymbol - Return the MCSymbol for the specified
1997 MCSymbol *AsmPrinter::GetExternalSymbolSymbol(StringRef Sym) const {
1998 SmallString<60> NameStr;
1999 Mang->getNameWithPrefix(NameStr, Sym);
2000 return OutContext.GetOrCreateSymbol(NameStr.str());
2005 /// PrintParentLoopComment - Print comments about parent loops of this one.
2006 static void PrintParentLoopComment(raw_ostream &OS, const MachineLoop *Loop,
2007 unsigned FunctionNumber) {
2008 if (Loop == 0) return;
2009 PrintParentLoopComment(OS, Loop->getParentLoop(), FunctionNumber);
2010 OS.indent(Loop->getLoopDepth()*2)
2011 << "Parent Loop BB" << FunctionNumber << "_"
2012 << Loop->getHeader()->getNumber()
2013 << " Depth=" << Loop->getLoopDepth() << '\n';
2017 /// PrintChildLoopComment - Print comments about child loops within
2018 /// the loop for this basic block, with nesting.
2019 static void PrintChildLoopComment(raw_ostream &OS, const MachineLoop *Loop,
2020 unsigned FunctionNumber) {
2021 // Add child loop information
2022 for (MachineLoop::iterator CL = Loop->begin(), E = Loop->end();CL != E; ++CL){
2023 OS.indent((*CL)->getLoopDepth()*2)
2024 << "Child Loop BB" << FunctionNumber << "_"
2025 << (*CL)->getHeader()->getNumber() << " Depth " << (*CL)->getLoopDepth()
2027 PrintChildLoopComment(OS, *CL, FunctionNumber);
2031 /// emitBasicBlockLoopComments - Pretty-print comments for basic blocks.
2032 static void emitBasicBlockLoopComments(const MachineBasicBlock &MBB,
2033 const MachineLoopInfo *LI,
2034 const AsmPrinter &AP) {
2035 // Add loop depth information
2036 const MachineLoop *Loop = LI->getLoopFor(&MBB);
2037 if (Loop == 0) return;
2039 MachineBasicBlock *Header = Loop->getHeader();
2040 assert(Header && "No header for loop");
2042 // If this block is not a loop header, just print out what is the loop header
2044 if (Header != &MBB) {
2045 AP.OutStreamer.AddComment(" in Loop: Header=BB" +
2046 Twine(AP.getFunctionNumber())+"_" +
2047 Twine(Loop->getHeader()->getNumber())+
2048 " Depth="+Twine(Loop->getLoopDepth()));
2052 // Otherwise, it is a loop header. Print out information about child and
2054 raw_ostream &OS = AP.OutStreamer.GetCommentOS();
2056 PrintParentLoopComment(OS, Loop->getParentLoop(), AP.getFunctionNumber());
2059 OS.indent(Loop->getLoopDepth()*2-2);
2064 OS << "Loop Header: Depth=" + Twine(Loop->getLoopDepth()) << '\n';
2066 PrintChildLoopComment(OS, Loop, AP.getFunctionNumber());
2070 /// EmitBasicBlockStart - This method prints the label for the specified
2071 /// MachineBasicBlock, an alignment (if present) and a comment describing
2072 /// it if appropriate.
2073 void AsmPrinter::EmitBasicBlockStart(const MachineBasicBlock *MBB) const {
2074 // Emit an alignment directive for this block, if needed.
2075 if (unsigned Align = MBB->getAlignment())
2076 EmitAlignment(Align);
2078 // If the block has its address taken, emit any labels that were used to
2079 // reference the block. It is possible that there is more than one label
2080 // here, because multiple LLVM BB's may have been RAUW'd to this block after
2081 // the references were generated.
2082 if (MBB->hasAddressTaken()) {
2083 const BasicBlock *BB = MBB->getBasicBlock();
2085 OutStreamer.AddComment("Block address taken");
2087 std::vector<MCSymbol*> Syms = MMI->getAddrLabelSymbolToEmit(BB);
2089 for (unsigned i = 0, e = Syms.size(); i != e; ++i)
2090 OutStreamer.EmitLabel(Syms[i]);
2093 // Print some verbose block comments.
2095 if (const BasicBlock *BB = MBB->getBasicBlock())
2097 OutStreamer.AddComment("%" + BB->getName());
2098 emitBasicBlockLoopComments(*MBB, LI, *this);
2101 // Print the main label for the block.
2102 if (MBB->pred_empty() || isBlockOnlyReachableByFallthrough(MBB)) {
2103 if (isVerbose() && OutStreamer.hasRawTextSupport()) {
2104 // NOTE: Want this comment at start of line, don't emit with AddComment.
2105 OutStreamer.EmitRawText(Twine(MAI->getCommentString()) + " BB#" +
2106 Twine(MBB->getNumber()) + ":");
2109 OutStreamer.EmitLabel(MBB->getSymbol());
2113 void AsmPrinter::EmitVisibility(MCSymbol *Sym, unsigned Visibility,
2114 bool IsDefinition) const {
2115 MCSymbolAttr Attr = MCSA_Invalid;
2117 switch (Visibility) {
2119 case GlobalValue::HiddenVisibility:
2121 Attr = MAI->getHiddenVisibilityAttr();
2123 Attr = MAI->getHiddenDeclarationVisibilityAttr();
2125 case GlobalValue::ProtectedVisibility:
2126 Attr = MAI->getProtectedVisibilityAttr();
2130 if (Attr != MCSA_Invalid)
2131 OutStreamer.EmitSymbolAttribute(Sym, Attr);
2134 /// isBlockOnlyReachableByFallthough - Return true if the basic block has
2135 /// exactly one predecessor and the control transfer mechanism between
2136 /// the predecessor and this block is a fall-through.
2138 isBlockOnlyReachableByFallthrough(const MachineBasicBlock *MBB) const {
2139 // If this is a landing pad, it isn't a fall through. If it has no preds,
2140 // then nothing falls through to it.
2141 if (MBB->isLandingPad() || MBB->pred_empty())
2144 // If there isn't exactly one predecessor, it can't be a fall through.
2145 MachineBasicBlock::const_pred_iterator PI = MBB->pred_begin(), PI2 = PI;
2147 if (PI2 != MBB->pred_end())
2150 // The predecessor has to be immediately before this block.
2151 MachineBasicBlock *Pred = *PI;
2153 if (!Pred->isLayoutSuccessor(MBB))
2156 // If the block is completely empty, then it definitely does fall through.
2160 // Check the terminators in the previous blocks
2161 for (MachineBasicBlock::iterator II = Pred->getFirstTerminator(),
2162 IE = Pred->end(); II != IE; ++II) {
2163 MachineInstr &MI = *II;
2165 // If it is not a simple branch, we are in a table somewhere.
2166 if (!MI.isBranch() || MI.isIndirectBranch())
2169 // If we are the operands of one of the branches, this is not
2171 for (MachineInstr::mop_iterator OI = MI.operands_begin(),
2172 OE = MI.operands_end(); OI != OE; ++OI) {
2173 const MachineOperand& OP = *OI;
2176 if (OP.isMBB() && OP.getMBB() == MBB)
2186 GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy *S) {
2187 if (!S->usesMetadata())
2190 gcp_map_type &GCMap = getGCMap(GCMetadataPrinters);
2191 gcp_map_type::iterator GCPI = GCMap.find(S);
2192 if (GCPI != GCMap.end())
2193 return GCPI->second;
2195 const char *Name = S->getName().c_str();
2197 for (GCMetadataPrinterRegistry::iterator
2198 I = GCMetadataPrinterRegistry::begin(),
2199 E = GCMetadataPrinterRegistry::end(); I != E; ++I)
2200 if (strcmp(Name, I->getName()) == 0) {
2201 GCMetadataPrinter *GMP = I->instantiate();
2203 GCMap.insert(std::make_pair(S, GMP));
2207 report_fatal_error("no GCMetadataPrinter registered for GC: " + Twine(Name));