1 //===-- AsmPrinter.cpp - Common AsmPrinter code ---------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the AsmPrinter class.
12 //===----------------------------------------------------------------------===//
14 #define DEBUG_TYPE "asm-printer"
15 #include "llvm/CodeGen/AsmPrinter.h"
16 #include "DwarfDebug.h"
17 #include "DwarfException.h"
18 #include "llvm/Module.h"
19 #include "llvm/CodeGen/GCMetadataPrinter.h"
20 #include "llvm/CodeGen/MachineConstantPool.h"
21 #include "llvm/CodeGen/MachineFrameInfo.h"
22 #include "llvm/CodeGen/MachineFunction.h"
23 #include "llvm/CodeGen/MachineJumpTableInfo.h"
24 #include "llvm/CodeGen/MachineLoopInfo.h"
25 #include "llvm/CodeGen/MachineModuleInfo.h"
26 #include "llvm/Analysis/ConstantFolding.h"
27 #include "llvm/Analysis/DebugInfo.h"
28 #include "llvm/MC/MCAsmInfo.h"
29 #include "llvm/MC/MCContext.h"
30 #include "llvm/MC/MCExpr.h"
31 #include "llvm/MC/MCInst.h"
32 #include "llvm/MC/MCSection.h"
33 #include "llvm/MC/MCStreamer.h"
34 #include "llvm/MC/MCSymbol.h"
35 #include "llvm/Target/Mangler.h"
36 #include "llvm/Target/TargetData.h"
37 #include "llvm/Target/TargetInstrInfo.h"
38 #include "llvm/Target/TargetLowering.h"
39 #include "llvm/Target/TargetLoweringObjectFile.h"
40 #include "llvm/Target/TargetRegisterInfo.h"
41 #include "llvm/ADT/SmallString.h"
42 #include "llvm/ADT/Statistic.h"
43 #include "llvm/Support/ErrorHandling.h"
44 #include "llvm/Support/Format.h"
47 STATISTIC(EmittedInsts, "Number of machine instrs printed");
49 char AsmPrinter::ID = 0;
51 typedef DenseMap<GCStrategy*,GCMetadataPrinter*> gcp_map_type;
52 static gcp_map_type &getGCMap(void *&P) {
54 P = new gcp_map_type();
55 return *(gcp_map_type*)P;
59 AsmPrinter::AsmPrinter(TargetMachine &tm, MCStreamer &Streamer)
60 : MachineFunctionPass(&ID),
61 TM(tm), MAI(tm.getMCAsmInfo()),
62 OutContext(Streamer.getContext()),
63 OutStreamer(Streamer),
64 LastMI(0), LastFn(0), Counter(~0U), SetCounter(0) {
65 DD = 0; DE = 0; MMI = 0; LI = 0;
66 GCMetadataPrinters = 0;
67 VerboseAsm = Streamer.isVerboseAsm();
70 AsmPrinter::~AsmPrinter() {
71 assert(DD == 0 && DE == 0 && "Debug/EH info didn't get finalized");
73 if (GCMetadataPrinters != 0) {
74 gcp_map_type &GCMap = getGCMap(GCMetadataPrinters);
76 for (gcp_map_type::iterator I = GCMap.begin(), E = GCMap.end(); I != E; ++I)
79 GCMetadataPrinters = 0;
85 /// getFunctionNumber - Return a unique ID for the current function.
87 unsigned AsmPrinter::getFunctionNumber() const {
88 return MF->getFunctionNumber();
91 TargetLoweringObjectFile &AsmPrinter::getObjFileLowering() const {
92 return TM.getTargetLowering()->getObjFileLowering();
96 /// getTargetData - Return information about data layout.
97 const TargetData &AsmPrinter::getTargetData() const {
98 return *TM.getTargetData();
101 /// getCurrentSection() - Return the current section we are emitting to.
102 const MCSection *AsmPrinter::getCurrentSection() const {
103 return OutStreamer.getCurrentSection();
108 void AsmPrinter::getAnalysisUsage(AnalysisUsage &AU) const {
109 AU.setPreservesAll();
110 MachineFunctionPass::getAnalysisUsage(AU);
111 AU.addRequired<MachineModuleInfo>();
112 AU.addRequired<GCModuleInfo>();
114 AU.addRequired<MachineLoopInfo>();
117 bool AsmPrinter::doInitialization(Module &M) {
118 MMI = getAnalysisIfAvailable<MachineModuleInfo>();
119 MMI->AnalyzeModule(M);
121 // Initialize TargetLoweringObjectFile.
122 const_cast<TargetLoweringObjectFile&>(getObjFileLowering())
123 .Initialize(OutContext, TM);
125 Mang = new Mangler(OutContext, *TM.getTargetData());
127 // Allow the target to emit any magic that it wants at the start of the file.
128 EmitStartOfAsmFile(M);
130 // Very minimal debug info. It is ignored if we emit actual debug info. If we
131 // don't, this at least helps the user find where a global came from.
132 if (MAI->hasSingleParameterDotFile()) {
134 OutStreamer.EmitFileDirective(M.getModuleIdentifier());
137 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
138 assert(MI && "AsmPrinter didn't require GCModuleInfo?");
139 for (GCModuleInfo::iterator I = MI->begin(), E = MI->end(); I != E; ++I)
140 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I))
141 MP->beginAssembly(*this);
143 // Emit module-level inline asm if it exists.
144 if (!M.getModuleInlineAsm().empty()) {
145 OutStreamer.AddComment("Start of file scope inline assembly");
146 OutStreamer.AddBlankLine();
147 EmitInlineAsm(M.getModuleInlineAsm(), 0/*no loc cookie*/);
148 OutStreamer.AddComment("End of file scope inline assembly");
149 OutStreamer.AddBlankLine();
152 if (MAI->doesSupportDebugInformation())
153 DD = new DwarfDebug(this, &M);
155 if (MAI->doesSupportExceptionHandling())
156 DE = new DwarfException(this);
161 void AsmPrinter::EmitLinkage(unsigned Linkage, MCSymbol *GVSym) const {
162 switch ((GlobalValue::LinkageTypes)Linkage) {
163 case GlobalValue::CommonLinkage:
164 case GlobalValue::LinkOnceAnyLinkage:
165 case GlobalValue::LinkOnceODRLinkage:
166 case GlobalValue::WeakAnyLinkage:
167 case GlobalValue::WeakODRLinkage:
168 case GlobalValue::LinkerPrivateLinkage:
169 if (MAI->getWeakDefDirective() != 0) {
171 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
172 // .weak_definition _foo
173 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_WeakDefinition);
174 } else if (const char *LinkOnce = MAI->getLinkOnceDirective()) {
176 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
177 // FIXME: linkonce should be a section attribute, handled by COFF Section
179 // http://sourceware.org/binutils/docs-2.20/as/Linkonce.html#Linkonce
181 // FIXME: It would be nice to use .linkonce samesize for non-common
183 OutStreamer.EmitRawText(StringRef(LinkOnce));
186 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Weak);
189 case GlobalValue::DLLExportLinkage:
190 case GlobalValue::AppendingLinkage:
191 // FIXME: appending linkage variables should go into a section of
192 // their name or something. For now, just emit them as external.
193 case GlobalValue::ExternalLinkage:
194 // If external or appending, declare as a global symbol.
196 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
198 case GlobalValue::PrivateLinkage:
199 case GlobalValue::InternalLinkage:
202 llvm_unreachable("Unknown linkage type!");
207 /// EmitGlobalVariable - Emit the specified global variable to the .s file.
208 void AsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) {
209 if (!GV->hasInitializer()) // External globals require no code.
212 // Check to see if this is a special global used by LLVM, if so, emit it.
213 if (EmitSpecialLLVMGlobal(GV))
216 MCSymbol *GVSym = Mang->getSymbol(GV);
217 EmitVisibility(GVSym, GV->getVisibility());
219 if (MAI->hasDotTypeDotSizeDirective())
220 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_ELF_TypeObject);
222 SectionKind GVKind = TargetLoweringObjectFile::getKindForGlobal(GV, TM);
224 const TargetData *TD = TM.getTargetData();
225 unsigned Size = TD->getTypeAllocSize(GV->getType()->getElementType());
226 unsigned AlignLog = TD->getPreferredAlignmentLog(GV);
228 // Handle common and BSS local symbols (.lcomm).
229 if (GVKind.isCommon() || GVKind.isBSSLocal()) {
230 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
233 WriteAsOperand(OutStreamer.GetCommentOS(), GV,
234 /*PrintType=*/false, GV->getParent());
235 OutStreamer.GetCommentOS() << '\n';
238 // Handle common symbols.
239 if (GVKind.isCommon()) {
241 OutStreamer.EmitCommonSymbol(GVSym, Size, 1 << AlignLog);
245 // Handle local BSS symbols.
246 if (MAI->hasMachoZeroFillDirective()) {
247 const MCSection *TheSection =
248 getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM);
249 // .zerofill __DATA, __bss, _foo, 400, 5
250 OutStreamer.EmitZerofill(TheSection, GVSym, Size, 1 << AlignLog);
254 if (MAI->hasLCOMMDirective()) {
256 OutStreamer.EmitLocalCommonSymbol(GVSym, Size);
261 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Local);
263 OutStreamer.EmitCommonSymbol(GVSym, Size, 1 << AlignLog);
267 const MCSection *TheSection =
268 getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM);
270 // Handle the zerofill directive on darwin, which is a special form of BSS
272 if (GVKind.isBSSExtern() && MAI->hasMachoZeroFillDirective()) {
274 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
275 // .zerofill __DATA, __common, _foo, 400, 5
276 OutStreamer.EmitZerofill(TheSection, GVSym, Size, 1 << AlignLog);
280 OutStreamer.SwitchSection(TheSection);
282 EmitLinkage(GV->getLinkage(), GVSym);
283 EmitAlignment(AlignLog, GV);
286 WriteAsOperand(OutStreamer.GetCommentOS(), GV,
287 /*PrintType=*/false, GV->getParent());
288 OutStreamer.GetCommentOS() << '\n';
290 OutStreamer.EmitLabel(GVSym);
292 EmitGlobalConstant(GV->getInitializer());
294 if (MAI->hasDotTypeDotSizeDirective())
296 OutStreamer.EmitELFSize(GVSym, MCConstantExpr::Create(Size, OutContext));
298 OutStreamer.AddBlankLine();
301 /// EmitFunctionHeader - This method emits the header for the current
303 void AsmPrinter::EmitFunctionHeader() {
304 // Print out constants referenced by the function
307 // Print the 'header' of function.
308 const Function *F = MF->getFunction();
310 OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang, TM));
311 EmitVisibility(CurrentFnSym, F->getVisibility());
313 EmitLinkage(F->getLinkage(), CurrentFnSym);
314 EmitAlignment(MF->getAlignment(), F);
316 if (MAI->hasDotTypeDotSizeDirective())
317 OutStreamer.EmitSymbolAttribute(CurrentFnSym, MCSA_ELF_TypeFunction);
320 WriteAsOperand(OutStreamer.GetCommentOS(), F,
321 /*PrintType=*/false, F->getParent());
322 OutStreamer.GetCommentOS() << '\n';
325 // Emit the CurrentFnSym. This is a virtual function to allow targets to
326 // do their wild and crazy things as required.
327 EmitFunctionEntryLabel();
329 // If the function had address-taken blocks that got deleted, then we have
330 // references to the dangling symbols. Emit them at the start of the function
331 // so that we don't get references to undefined symbols.
332 std::vector<MCSymbol*> DeadBlockSyms;
333 MMI->takeDeletedSymbolsForFunction(F, DeadBlockSyms);
334 for (unsigned i = 0, e = DeadBlockSyms.size(); i != e; ++i) {
335 OutStreamer.AddComment("Address taken block that was later removed");
336 OutStreamer.EmitLabel(DeadBlockSyms[i]);
339 // Add some workaround for linkonce linkage on Cygwin\MinGW.
340 if (MAI->getLinkOnceDirective() != 0 &&
341 (F->hasLinkOnceLinkage() || F->hasWeakLinkage())) {
342 // FIXME: What is this?
344 OutContext.GetOrCreateSymbol(Twine("Lllvm$workaround$fake$stub$")+
345 CurrentFnSym->getName());
346 OutStreamer.EmitLabel(FakeStub);
349 // Emit pre-function debug and/or EH information.
350 if (DE) DE->BeginFunction(MF);
351 if (DD) DD->beginFunction(MF);
354 /// EmitFunctionEntryLabel - Emit the label that is the entrypoint for the
355 /// function. This can be overridden by targets as required to do custom stuff.
356 void AsmPrinter::EmitFunctionEntryLabel() {
357 OutStreamer.EmitLabel(CurrentFnSym);
361 /// EmitComments - Pretty-print comments for instructions.
362 static void EmitComments(const MachineInstr &MI, raw_ostream &CommentOS) {
363 const MachineFunction *MF = MI.getParent()->getParent();
364 const TargetMachine &TM = MF->getTarget();
366 DebugLoc DL = MI.getDebugLoc();
367 if (!DL.isUnknown()) { // Print source line info.
368 DIScope Scope(DL.getScope(MF->getFunction()->getContext()));
369 // Omit the directory, because it's likely to be long and uninteresting.
371 CommentOS << Scope.getFilename();
373 CommentOS << "<unknown>";
374 CommentOS << ':' << DL.getLine();
375 if (DL.getCol() != 0)
376 CommentOS << ':' << DL.getCol();
380 // Check for spills and reloads
383 const MachineFrameInfo *FrameInfo = MF->getFrameInfo();
385 // We assume a single instruction only has a spill or reload, not
387 const MachineMemOperand *MMO;
388 if (TM.getInstrInfo()->isLoadFromStackSlotPostFE(&MI, FI)) {
389 if (FrameInfo->isSpillSlotObjectIndex(FI)) {
390 MMO = *MI.memoperands_begin();
391 CommentOS << MMO->getSize() << "-byte Reload\n";
393 } else if (TM.getInstrInfo()->hasLoadFromStackSlot(&MI, MMO, FI)) {
394 if (FrameInfo->isSpillSlotObjectIndex(FI))
395 CommentOS << MMO->getSize() << "-byte Folded Reload\n";
396 } else if (TM.getInstrInfo()->isStoreToStackSlotPostFE(&MI, FI)) {
397 if (FrameInfo->isSpillSlotObjectIndex(FI)) {
398 MMO = *MI.memoperands_begin();
399 CommentOS << MMO->getSize() << "-byte Spill\n";
401 } else if (TM.getInstrInfo()->hasStoreToStackSlot(&MI, MMO, FI)) {
402 if (FrameInfo->isSpillSlotObjectIndex(FI))
403 CommentOS << MMO->getSize() << "-byte Folded Spill\n";
406 // Check for spill-induced copies
407 unsigned SrcReg, DstReg, SrcSubIdx, DstSubIdx;
408 if (TM.getInstrInfo()->isMoveInstr(MI, SrcReg, DstReg,
409 SrcSubIdx, DstSubIdx)) {
410 if (MI.getAsmPrinterFlag(MachineInstr::ReloadReuse))
411 CommentOS << " Reload Reuse\n";
415 /// EmitImplicitDef - This method emits the specified machine instruction
416 /// that is an implicit def.
417 static void EmitImplicitDef(const MachineInstr *MI, AsmPrinter &AP) {
418 unsigned RegNo = MI->getOperand(0).getReg();
419 AP.OutStreamer.AddComment(Twine("implicit-def: ") +
420 AP.TM.getRegisterInfo()->getName(RegNo));
421 AP.OutStreamer.AddBlankLine();
424 static void EmitKill(const MachineInstr *MI, AsmPrinter &AP) {
425 std::string Str = "kill:";
426 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
427 const MachineOperand &Op = MI->getOperand(i);
428 assert(Op.isReg() && "KILL instruction must have only register operands");
430 Str += AP.TM.getRegisterInfo()->getName(Op.getReg());
431 Str += (Op.isDef() ? "<def>" : "<kill>");
433 AP.OutStreamer.AddComment(Str);
434 AP.OutStreamer.AddBlankLine();
439 /// EmitFunctionBody - This method emits the body and trailer for a
441 void AsmPrinter::EmitFunctionBody() {
442 // Emit target-specific gunk before the function body.
443 EmitFunctionBodyStart();
445 bool ShouldPrintDebugScopes = DD && MMI->hasDebugInfo();
447 // Print out code for the function.
448 bool HasAnyRealCode = false;
449 for (MachineFunction::const_iterator I = MF->begin(), E = MF->end();
451 // Print a label for the basic block.
452 EmitBasicBlockStart(I);
453 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
455 // Print the assembly for the instruction.
457 HasAnyRealCode = true;
461 if (ShouldPrintDebugScopes)
465 EmitComments(*II, OutStreamer.GetCommentOS());
467 switch (II->getOpcode()) {
468 case TargetOpcode::DBG_LABEL:
469 case TargetOpcode::EH_LABEL:
470 case TargetOpcode::GC_LABEL:
471 OutStreamer.EmitLabel(II->getOperand(0).getMCSymbol());
473 case TargetOpcode::INLINEASM:
476 case TargetOpcode::IMPLICIT_DEF:
477 if (isVerbose()) EmitImplicitDef(II, *this);
479 case TargetOpcode::KILL:
480 if (isVerbose()) EmitKill(II, *this);
487 if (ShouldPrintDebugScopes)
492 // If the function is empty and the object file uses .subsections_via_symbols,
493 // then we need to emit *something* to the function body to prevent the
494 // labels from collapsing together. Just emit a 0 byte.
495 if (MAI->hasSubsectionsViaSymbols() && !HasAnyRealCode)
496 OutStreamer.EmitIntValue(0, 1, 0/*addrspace*/);
498 // Emit target-specific gunk after the function body.
499 EmitFunctionBodyEnd();
501 // If the target wants a .size directive for the size of the function, emit
503 if (MAI->hasDotTypeDotSizeDirective()) {
504 // Create a symbol for the end of function, so we can get the size as
505 // difference between the function label and the temp label.
506 MCSymbol *FnEndLabel = OutContext.CreateTempSymbol();
507 OutStreamer.EmitLabel(FnEndLabel);
509 const MCExpr *SizeExp =
510 MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(FnEndLabel, OutContext),
511 MCSymbolRefExpr::Create(CurrentFnSym, OutContext),
513 OutStreamer.EmitELFSize(CurrentFnSym, SizeExp);
516 // Emit post-function debug information.
517 if (DD) DD->endFunction(MF);
518 if (DE) DE->EndFunction();
521 // Print out jump tables referenced by the function.
524 OutStreamer.AddBlankLine();
528 bool AsmPrinter::doFinalization(Module &M) {
529 // Emit global variables.
530 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
532 EmitGlobalVariable(I);
534 // Finalize debug and EH information.
544 // If the target wants to know about weak references, print them all.
545 if (MAI->getWeakRefDirective()) {
546 // FIXME: This is not lazy, it would be nice to only print weak references
547 // to stuff that is actually used. Note that doing so would require targets
548 // to notice uses in operands (due to constant exprs etc). This should
549 // happen with the MC stuff eventually.
551 // Print out module-level global variables here.
552 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
554 if (!I->hasExternalWeakLinkage()) continue;
555 OutStreamer.EmitSymbolAttribute(Mang->getSymbol(I), MCSA_WeakReference);
558 for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I) {
559 if (!I->hasExternalWeakLinkage()) continue;
560 OutStreamer.EmitSymbolAttribute(Mang->getSymbol(I), MCSA_WeakReference);
564 if (MAI->hasSetDirective()) {
565 OutStreamer.AddBlankLine();
566 for (Module::const_alias_iterator I = M.alias_begin(), E = M.alias_end();
568 MCSymbol *Name = Mang->getSymbol(I);
570 const GlobalValue *GV = cast<GlobalValue>(I->getAliasedGlobal());
571 MCSymbol *Target = Mang->getSymbol(GV);
573 if (I->hasExternalLinkage() || !MAI->getWeakRefDirective())
574 OutStreamer.EmitSymbolAttribute(Name, MCSA_Global);
575 else if (I->hasWeakLinkage())
576 OutStreamer.EmitSymbolAttribute(Name, MCSA_WeakReference);
578 assert(I->hasLocalLinkage() && "Invalid alias linkage");
580 EmitVisibility(Name, I->getVisibility());
582 // Emit the directives as assignments aka .set:
583 OutStreamer.EmitAssignment(Name,
584 MCSymbolRefExpr::Create(Target, OutContext));
588 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
589 assert(MI && "AsmPrinter didn't require GCModuleInfo?");
590 for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; )
591 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*--I))
592 MP->finishAssembly(*this);
594 // If we don't have any trampolines, then we don't require stack memory
595 // to be executable. Some targets have a directive to declare this.
596 Function *InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline");
597 if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty())
598 if (MCSection *S = MAI->getNonexecutableStackSection(OutContext))
599 OutStreamer.SwitchSection(S);
601 // Allow the target to emit any magic that it wants at the end of the file,
602 // after everything else has gone out.
605 delete Mang; Mang = 0;
608 OutStreamer.Finish();
612 void AsmPrinter::SetupMachineFunction(MachineFunction &MF) {
614 // Get the function symbol.
615 CurrentFnSym = Mang->getSymbol(MF.getFunction());
618 LI = &getAnalysis<MachineLoopInfo>();
622 // SectionCPs - Keep track the alignment, constpool entries per Section.
626 SmallVector<unsigned, 4> CPEs;
627 SectionCPs(const MCSection *s, unsigned a) : S(s), Alignment(a) {}
631 /// EmitConstantPool - Print to the current output stream assembly
632 /// representations of the constants in the constant pool MCP. This is
633 /// used to print out constants which have been "spilled to memory" by
634 /// the code generator.
636 void AsmPrinter::EmitConstantPool() {
637 const MachineConstantPool *MCP = MF->getConstantPool();
638 const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
639 if (CP.empty()) return;
641 // Calculate sections for constant pool entries. We collect entries to go into
642 // the same section together to reduce amount of section switch statements.
643 SmallVector<SectionCPs, 4> CPSections;
644 for (unsigned i = 0, e = CP.size(); i != e; ++i) {
645 const MachineConstantPoolEntry &CPE = CP[i];
646 unsigned Align = CPE.getAlignment();
649 switch (CPE.getRelocationInfo()) {
650 default: llvm_unreachable("Unknown section kind");
651 case 2: Kind = SectionKind::getReadOnlyWithRel(); break;
653 Kind = SectionKind::getReadOnlyWithRelLocal();
656 switch (TM.getTargetData()->getTypeAllocSize(CPE.getType())) {
657 case 4: Kind = SectionKind::getMergeableConst4(); break;
658 case 8: Kind = SectionKind::getMergeableConst8(); break;
659 case 16: Kind = SectionKind::getMergeableConst16();break;
660 default: Kind = SectionKind::getMergeableConst(); break;
664 const MCSection *S = getObjFileLowering().getSectionForConstant(Kind);
666 // The number of sections are small, just do a linear search from the
667 // last section to the first.
669 unsigned SecIdx = CPSections.size();
670 while (SecIdx != 0) {
671 if (CPSections[--SecIdx].S == S) {
677 SecIdx = CPSections.size();
678 CPSections.push_back(SectionCPs(S, Align));
681 if (Align > CPSections[SecIdx].Alignment)
682 CPSections[SecIdx].Alignment = Align;
683 CPSections[SecIdx].CPEs.push_back(i);
686 // Now print stuff into the calculated sections.
687 for (unsigned i = 0, e = CPSections.size(); i != e; ++i) {
688 OutStreamer.SwitchSection(CPSections[i].S);
689 EmitAlignment(Log2_32(CPSections[i].Alignment));
692 for (unsigned j = 0, ee = CPSections[i].CPEs.size(); j != ee; ++j) {
693 unsigned CPI = CPSections[i].CPEs[j];
694 MachineConstantPoolEntry CPE = CP[CPI];
696 // Emit inter-object padding for alignment.
697 unsigned AlignMask = CPE.getAlignment() - 1;
698 unsigned NewOffset = (Offset + AlignMask) & ~AlignMask;
699 OutStreamer.EmitFill(NewOffset - Offset, 0/*fillval*/, 0/*addrspace*/);
701 const Type *Ty = CPE.getType();
702 Offset = NewOffset + TM.getTargetData()->getTypeAllocSize(Ty);
704 // Emit the label with a comment on it.
706 OutStreamer.GetCommentOS() << "constant pool ";
707 WriteTypeSymbolic(OutStreamer.GetCommentOS(), CPE.getType(),
708 MF->getFunction()->getParent());
709 OutStreamer.GetCommentOS() << '\n';
711 OutStreamer.EmitLabel(GetCPISymbol(CPI));
713 if (CPE.isMachineConstantPoolEntry())
714 EmitMachineConstantPoolValue(CPE.Val.MachineCPVal);
716 EmitGlobalConstant(CPE.Val.ConstVal);
721 /// EmitJumpTableInfo - Print assembly representations of the jump tables used
722 /// by the current function to the current output stream.
724 void AsmPrinter::EmitJumpTableInfo() {
725 const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo();
726 if (MJTI == 0) return;
727 if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_Inline) return;
728 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
729 if (JT.empty()) return;
731 // Pick the directive to use to print the jump table entries, and switch to
732 // the appropriate section.
733 const Function *F = MF->getFunction();
734 bool JTInDiffSection = false;
735 if (// In PIC mode, we need to emit the jump table to the same section as the
736 // function body itself, otherwise the label differences won't make sense.
737 // FIXME: Need a better predicate for this: what about custom entries?
738 MJTI->getEntryKind() == MachineJumpTableInfo::EK_LabelDifference32 ||
739 // We should also do if the section name is NULL or function is declared
740 // in discardable section
741 // FIXME: this isn't the right predicate, should be based on the MCSection
743 F->isWeakForLinker()) {
744 OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F,Mang,TM));
746 // Otherwise, drop it in the readonly section.
747 const MCSection *ReadOnlySection =
748 getObjFileLowering().getSectionForConstant(SectionKind::getReadOnly());
749 OutStreamer.SwitchSection(ReadOnlySection);
750 JTInDiffSection = true;
753 EmitAlignment(Log2_32(MJTI->getEntryAlignment(*TM.getTargetData())));
755 for (unsigned JTI = 0, e = JT.size(); JTI != e; ++JTI) {
756 const std::vector<MachineBasicBlock*> &JTBBs = JT[JTI].MBBs;
758 // If this jump table was deleted, ignore it.
759 if (JTBBs.empty()) continue;
761 // For the EK_LabelDifference32 entry, if the target supports .set, emit a
762 // .set directive for each unique entry. This reduces the number of
763 // relocations the assembler will generate for the jump table.
764 if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_LabelDifference32 &&
765 MAI->hasSetDirective()) {
766 SmallPtrSet<const MachineBasicBlock*, 16> EmittedSets;
767 const TargetLowering *TLI = TM.getTargetLowering();
768 const MCExpr *Base = TLI->getPICJumpTableRelocBaseExpr(MF,JTI,OutContext);
769 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
770 const MachineBasicBlock *MBB = JTBBs[ii];
771 if (!EmittedSets.insert(MBB)) continue;
773 // .set LJTSet, LBB32-base
775 MCSymbolRefExpr::Create(MBB->getSymbol(), OutContext);
776 OutStreamer.EmitAssignment(GetJTSetSymbol(JTI, MBB->getNumber()),
777 MCBinaryExpr::CreateSub(LHS, Base, OutContext));
781 // On some targets (e.g. Darwin) we want to emit two consequtive labels
782 // before each jump table. The first label is never referenced, but tells
783 // the assembler and linker the extents of the jump table object. The
784 // second label is actually referenced by the code.
785 if (JTInDiffSection && MAI->getLinkerPrivateGlobalPrefix()[0])
786 // FIXME: This doesn't have to have any specific name, just any randomly
787 // named and numbered 'l' label would work. Simplify GetJTISymbol.
788 OutStreamer.EmitLabel(GetJTISymbol(JTI, true));
790 OutStreamer.EmitLabel(GetJTISymbol(JTI));
792 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
793 EmitJumpTableEntry(MJTI, JTBBs[ii], JTI);
797 /// EmitJumpTableEntry - Emit a jump table entry for the specified MBB to the
799 void AsmPrinter::EmitJumpTableEntry(const MachineJumpTableInfo *MJTI,
800 const MachineBasicBlock *MBB,
801 unsigned UID) const {
802 const MCExpr *Value = 0;
803 switch (MJTI->getEntryKind()) {
804 case MachineJumpTableInfo::EK_Inline:
805 llvm_unreachable("Cannot emit EK_Inline jump table entry"); break;
806 case MachineJumpTableInfo::EK_Custom32:
807 Value = TM.getTargetLowering()->LowerCustomJumpTableEntry(MJTI, MBB, UID,
810 case MachineJumpTableInfo::EK_BlockAddress:
811 // EK_BlockAddress - Each entry is a plain address of block, e.g.:
813 Value = MCSymbolRefExpr::Create(MBB->getSymbol(), OutContext);
815 case MachineJumpTableInfo::EK_GPRel32BlockAddress: {
816 // EK_GPRel32BlockAddress - Each entry is an address of block, encoded
817 // with a relocation as gp-relative, e.g.:
819 MCSymbol *MBBSym = MBB->getSymbol();
820 OutStreamer.EmitGPRel32Value(MCSymbolRefExpr::Create(MBBSym, OutContext));
824 case MachineJumpTableInfo::EK_LabelDifference32: {
825 // EK_LabelDifference32 - Each entry is the address of the block minus
826 // the address of the jump table. This is used for PIC jump tables where
827 // gprel32 is not supported. e.g.:
828 // .word LBB123 - LJTI1_2
829 // If the .set directive is supported, this is emitted as:
830 // .set L4_5_set_123, LBB123 - LJTI1_2
831 // .word L4_5_set_123
833 // If we have emitted set directives for the jump table entries, print
834 // them rather than the entries themselves. If we're emitting PIC, then
835 // emit the table entries as differences between two text section labels.
836 if (MAI->hasSetDirective()) {
837 // If we used .set, reference the .set's symbol.
838 Value = MCSymbolRefExpr::Create(GetJTSetSymbol(UID, MBB->getNumber()),
842 // Otherwise, use the difference as the jump table entry.
843 Value = MCSymbolRefExpr::Create(MBB->getSymbol(), OutContext);
844 const MCExpr *JTI = MCSymbolRefExpr::Create(GetJTISymbol(UID), OutContext);
845 Value = MCBinaryExpr::CreateSub(Value, JTI, OutContext);
850 assert(Value && "Unknown entry kind!");
852 unsigned EntrySize = MJTI->getEntrySize(*TM.getTargetData());
853 OutStreamer.EmitValue(Value, EntrySize, /*addrspace*/0);
857 /// EmitSpecialLLVMGlobal - Check to see if the specified global is a
858 /// special global used by LLVM. If so, emit it and return true, otherwise
859 /// do nothing and return false.
860 bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
861 if (GV->getName() == "llvm.used") {
862 if (MAI->hasNoDeadStrip()) // No need to emit this at all.
863 EmitLLVMUsedList(GV->getInitializer());
867 // Ignore debug and non-emitted data. This handles llvm.compiler.used.
868 if (GV->getSection() == "llvm.metadata" ||
869 GV->hasAvailableExternallyLinkage())
872 if (!GV->hasAppendingLinkage()) return false;
874 assert(GV->hasInitializer() && "Not a special LLVM global!");
876 const TargetData *TD = TM.getTargetData();
877 unsigned Align = Log2_32(TD->getPointerPrefAlignment());
878 if (GV->getName() == "llvm.global_ctors") {
879 OutStreamer.SwitchSection(getObjFileLowering().getStaticCtorSection());
880 EmitAlignment(Align, 0);
881 EmitXXStructorList(GV->getInitializer());
883 if (TM.getRelocationModel() == Reloc::Static &&
884 MAI->hasStaticCtorDtorReferenceInStaticMode()) {
885 StringRef Sym(".constructors_used");
886 OutStreamer.EmitSymbolAttribute(OutContext.GetOrCreateSymbol(Sym),
892 if (GV->getName() == "llvm.global_dtors") {
893 OutStreamer.SwitchSection(getObjFileLowering().getStaticDtorSection());
894 EmitAlignment(Align, 0);
895 EmitXXStructorList(GV->getInitializer());
897 if (TM.getRelocationModel() == Reloc::Static &&
898 MAI->hasStaticCtorDtorReferenceInStaticMode()) {
899 StringRef Sym(".destructors_used");
900 OutStreamer.EmitSymbolAttribute(OutContext.GetOrCreateSymbol(Sym),
909 /// EmitLLVMUsedList - For targets that define a MAI::UsedDirective, mark each
910 /// global in the specified llvm.used list for which emitUsedDirectiveFor
911 /// is true, as being used with this directive.
912 void AsmPrinter::EmitLLVMUsedList(Constant *List) {
913 // Should be an array of 'i8*'.
914 ConstantArray *InitList = dyn_cast<ConstantArray>(List);
915 if (InitList == 0) return;
917 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
918 const GlobalValue *GV =
919 dyn_cast<GlobalValue>(InitList->getOperand(i)->stripPointerCasts());
920 if (GV && getObjFileLowering().shouldEmitUsedDirectiveFor(GV, Mang))
921 OutStreamer.EmitSymbolAttribute(Mang->getSymbol(GV), MCSA_NoDeadStrip);
925 /// EmitXXStructorList - Emit the ctor or dtor list. This just prints out the
926 /// function pointers, ignoring the init priority.
927 void AsmPrinter::EmitXXStructorList(Constant *List) {
928 // Should be an array of '{ int, void ()* }' structs. The first value is the
929 // init priority, which we ignore.
930 if (!isa<ConstantArray>(List)) return;
931 ConstantArray *InitList = cast<ConstantArray>(List);
932 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
933 if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
934 if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
936 if (CS->getOperand(1)->isNullValue())
937 return; // Found a null terminator, exit printing.
938 // Emit the function pointer.
939 EmitGlobalConstant(CS->getOperand(1));
943 //===--------------------------------------------------------------------===//
944 // Emission and print routines
947 /// EmitInt8 - Emit a byte directive and value.
949 void AsmPrinter::EmitInt8(int Value) const {
950 OutStreamer.EmitIntValue(Value, 1, 0/*addrspace*/);
953 /// EmitInt16 - Emit a short directive and value.
955 void AsmPrinter::EmitInt16(int Value) const {
956 OutStreamer.EmitIntValue(Value, 2, 0/*addrspace*/);
959 /// EmitInt32 - Emit a long directive and value.
961 void AsmPrinter::EmitInt32(int Value) const {
962 OutStreamer.EmitIntValue(Value, 4, 0/*addrspace*/);
965 /// EmitLabelDifference - Emit something like ".long Hi-Lo" where the size
966 /// in bytes of the directive is specified by Size and Hi/Lo specify the
967 /// labels. This implicitly uses .set if it is available.
968 void AsmPrinter::EmitLabelDifference(const MCSymbol *Hi, const MCSymbol *Lo,
969 unsigned Size) const {
970 // Get the Hi-Lo expression.
972 MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(Hi, OutContext),
973 MCSymbolRefExpr::Create(Lo, OutContext),
976 if (!MAI->hasSetDirective()) {
977 OutStreamer.EmitValue(Diff, Size, 0/*AddrSpace*/);
981 // Otherwise, emit with .set (aka assignment).
982 MCSymbol *SetLabel = GetTempSymbol("set", SetCounter++);
983 OutStreamer.EmitAssignment(SetLabel, Diff);
984 OutStreamer.EmitSymbolValue(SetLabel, Size, 0/*AddrSpace*/);
988 //===----------------------------------------------------------------------===//
990 // EmitAlignment - Emit an alignment directive to the specified power of
991 // two boundary. For example, if you pass in 3 here, you will get an 8
992 // byte alignment. If a global value is specified, and if that global has
993 // an explicit alignment requested, it will unconditionally override the
994 // alignment request. However, if ForcedAlignBits is specified, this value
995 // has final say: the ultimate alignment will be the max of ForcedAlignBits
996 // and the alignment computed with NumBits and the global.
1000 // if (GV && GV->hasalignment) Align = GV->getalignment();
1001 // Align = std::max(Align, ForcedAlignBits);
1003 void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV,
1004 unsigned ForcedAlignBits,
1005 bool UseFillExpr) const {
1006 if (GV && GV->getAlignment())
1007 NumBits = Log2_32(GV->getAlignment());
1008 NumBits = std::max(NumBits, ForcedAlignBits);
1010 if (NumBits == 0) return; // No need to emit alignment.
1012 if (getCurrentSection()->getKind().isText())
1013 OutStreamer.EmitCodeAlignment(1 << NumBits);
1015 OutStreamer.EmitValueToAlignment(1 << NumBits, 0, 1, 0);
1018 /// LowerConstant - Lower the specified LLVM Constant to an MCExpr.
1020 static const MCExpr *LowerConstant(const Constant *CV, AsmPrinter &AP) {
1021 MCContext &Ctx = AP.OutContext;
1023 if (CV->isNullValue() || isa<UndefValue>(CV))
1024 return MCConstantExpr::Create(0, Ctx);
1026 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV))
1027 return MCConstantExpr::Create(CI->getZExtValue(), Ctx);
1029 if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV))
1030 return MCSymbolRefExpr::Create(AP.Mang->getSymbol(GV), Ctx);
1031 if (const BlockAddress *BA = dyn_cast<BlockAddress>(CV))
1032 return MCSymbolRefExpr::Create(AP.GetBlockAddressSymbol(BA), Ctx);
1034 const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV);
1036 llvm_unreachable("Unknown constant value to lower!");
1037 return MCConstantExpr::Create(0, Ctx);
1040 switch (CE->getOpcode()) {
1042 // If the code isn't optimized, there may be outstanding folding
1043 // opportunities. Attempt to fold the expression using TargetData as a
1044 // last resort before giving up.
1046 ConstantFoldConstantExpression(CE, AP.TM.getTargetData()))
1048 return LowerConstant(C, AP);
1052 llvm_unreachable("FIXME: Don't support this constant expr");
1053 case Instruction::GetElementPtr: {
1054 const TargetData &TD = *AP.TM.getTargetData();
1055 // Generate a symbolic expression for the byte address
1056 const Constant *PtrVal = CE->getOperand(0);
1057 SmallVector<Value*, 8> IdxVec(CE->op_begin()+1, CE->op_end());
1058 int64_t Offset = TD.getIndexedOffset(PtrVal->getType(), &IdxVec[0],
1061 const MCExpr *Base = LowerConstant(CE->getOperand(0), AP);
1065 // Truncate/sext the offset to the pointer size.
1066 if (TD.getPointerSizeInBits() != 64) {
1067 int SExtAmount = 64-TD.getPointerSizeInBits();
1068 Offset = (Offset << SExtAmount) >> SExtAmount;
1071 return MCBinaryExpr::CreateAdd(Base, MCConstantExpr::Create(Offset, Ctx),
1075 case Instruction::Trunc:
1076 // We emit the value and depend on the assembler to truncate the generated
1077 // expression properly. This is important for differences between
1078 // blockaddress labels. Since the two labels are in the same function, it
1079 // is reasonable to treat their delta as a 32-bit value.
1081 case Instruction::BitCast:
1082 return LowerConstant(CE->getOperand(0), AP);
1084 case Instruction::IntToPtr: {
1085 const TargetData &TD = *AP.TM.getTargetData();
1086 // Handle casts to pointers by changing them into casts to the appropriate
1087 // integer type. This promotes constant folding and simplifies this code.
1088 Constant *Op = CE->getOperand(0);
1089 Op = ConstantExpr::getIntegerCast(Op, TD.getIntPtrType(CV->getContext()),
1091 return LowerConstant(Op, AP);
1094 case Instruction::PtrToInt: {
1095 const TargetData &TD = *AP.TM.getTargetData();
1096 // Support only foldable casts to/from pointers that can be eliminated by
1097 // changing the pointer to the appropriately sized integer type.
1098 Constant *Op = CE->getOperand(0);
1099 const Type *Ty = CE->getType();
1101 const MCExpr *OpExpr = LowerConstant(Op, AP);
1103 // We can emit the pointer value into this slot if the slot is an
1104 // integer slot equal to the size of the pointer.
1105 if (TD.getTypeAllocSize(Ty) == TD.getTypeAllocSize(Op->getType()))
1108 // Otherwise the pointer is smaller than the resultant integer, mask off
1109 // the high bits so we are sure to get a proper truncation if the input is
1111 unsigned InBits = TD.getTypeAllocSizeInBits(Op->getType());
1112 const MCExpr *MaskExpr = MCConstantExpr::Create(~0ULL >> (64-InBits), Ctx);
1113 return MCBinaryExpr::CreateAnd(OpExpr, MaskExpr, Ctx);
1116 // The MC library also has a right-shift operator, but it isn't consistently
1117 // signed or unsigned between different targets.
1118 case Instruction::Add:
1119 case Instruction::Sub:
1120 case Instruction::Mul:
1121 case Instruction::SDiv:
1122 case Instruction::SRem:
1123 case Instruction::Shl:
1124 case Instruction::And:
1125 case Instruction::Or:
1126 case Instruction::Xor: {
1127 const MCExpr *LHS = LowerConstant(CE->getOperand(0), AP);
1128 const MCExpr *RHS = LowerConstant(CE->getOperand(1), AP);
1129 switch (CE->getOpcode()) {
1130 default: llvm_unreachable("Unknown binary operator constant cast expr");
1131 case Instruction::Add: return MCBinaryExpr::CreateAdd(LHS, RHS, Ctx);
1132 case Instruction::Sub: return MCBinaryExpr::CreateSub(LHS, RHS, Ctx);
1133 case Instruction::Mul: return MCBinaryExpr::CreateMul(LHS, RHS, Ctx);
1134 case Instruction::SDiv: return MCBinaryExpr::CreateDiv(LHS, RHS, Ctx);
1135 case Instruction::SRem: return MCBinaryExpr::CreateMod(LHS, RHS, Ctx);
1136 case Instruction::Shl: return MCBinaryExpr::CreateShl(LHS, RHS, Ctx);
1137 case Instruction::And: return MCBinaryExpr::CreateAnd(LHS, RHS, Ctx);
1138 case Instruction::Or: return MCBinaryExpr::CreateOr (LHS, RHS, Ctx);
1139 case Instruction::Xor: return MCBinaryExpr::CreateXor(LHS, RHS, Ctx);
1145 static void EmitGlobalConstantArray(const ConstantArray *CA, unsigned AddrSpace,
1147 if (AddrSpace != 0 || !CA->isString()) {
1148 // Not a string. Print the values in successive locations
1149 for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i)
1150 AP.EmitGlobalConstant(CA->getOperand(i), AddrSpace);
1154 // Otherwise, it can be emitted as .ascii.
1155 SmallVector<char, 128> TmpVec;
1156 TmpVec.reserve(CA->getNumOperands());
1157 for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i)
1158 TmpVec.push_back(cast<ConstantInt>(CA->getOperand(i))->getZExtValue());
1160 AP.OutStreamer.EmitBytes(StringRef(TmpVec.data(), TmpVec.size()), AddrSpace);
1163 static void EmitGlobalConstantVector(const ConstantVector *CV,
1164 unsigned AddrSpace, AsmPrinter &AP) {
1165 for (unsigned i = 0, e = CV->getType()->getNumElements(); i != e; ++i)
1166 AP.EmitGlobalConstant(CV->getOperand(i), AddrSpace);
1169 static void EmitGlobalConstantStruct(const ConstantStruct *CS,
1170 unsigned AddrSpace, AsmPrinter &AP) {
1171 // Print the fields in successive locations. Pad to align if needed!
1172 const TargetData *TD = AP.TM.getTargetData();
1173 unsigned Size = TD->getTypeAllocSize(CS->getType());
1174 const StructLayout *Layout = TD->getStructLayout(CS->getType());
1175 uint64_t SizeSoFar = 0;
1176 for (unsigned i = 0, e = CS->getNumOperands(); i != e; ++i) {
1177 const Constant *Field = CS->getOperand(i);
1179 // Check if padding is needed and insert one or more 0s.
1180 uint64_t FieldSize = TD->getTypeAllocSize(Field->getType());
1181 uint64_t PadSize = ((i == e-1 ? Size : Layout->getElementOffset(i+1))
1182 - Layout->getElementOffset(i)) - FieldSize;
1183 SizeSoFar += FieldSize + PadSize;
1185 // Now print the actual field value.
1186 AP.EmitGlobalConstant(Field, AddrSpace);
1188 // Insert padding - this may include padding to increase the size of the
1189 // current field up to the ABI size (if the struct is not packed) as well
1190 // as padding to ensure that the next field starts at the right offset.
1191 AP.OutStreamer.EmitZeros(PadSize, AddrSpace);
1193 assert(SizeSoFar == Layout->getSizeInBytes() &&
1194 "Layout of constant struct may be incorrect!");
1197 static void EmitGlobalConstantUnion(const ConstantUnion *CU,
1198 unsigned AddrSpace, AsmPrinter &AP) {
1199 const TargetData *TD = AP.TM.getTargetData();
1200 unsigned Size = TD->getTypeAllocSize(CU->getType());
1202 const Constant *Contents = CU->getOperand(0);
1203 unsigned FilledSize = TD->getTypeAllocSize(Contents->getType());
1205 // Print the actually filled part
1206 AP.EmitGlobalConstant(Contents, AddrSpace);
1208 // And pad with enough zeroes
1209 AP.OutStreamer.EmitZeros(Size-FilledSize, AddrSpace);
1212 static void EmitGlobalConstantFP(const ConstantFP *CFP, unsigned AddrSpace,
1214 // FP Constants are printed as integer constants to avoid losing
1216 if (CFP->getType()->isDoubleTy()) {
1217 if (AP.isVerbose()) {
1218 double Val = CFP->getValueAPF().convertToDouble();
1219 AP.OutStreamer.GetCommentOS() << "double " << Val << '\n';
1222 uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1223 AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace);
1227 if (CFP->getType()->isFloatTy()) {
1228 if (AP.isVerbose()) {
1229 float Val = CFP->getValueAPF().convertToFloat();
1230 AP.OutStreamer.GetCommentOS() << "float " << Val << '\n';
1232 uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1233 AP.OutStreamer.EmitIntValue(Val, 4, AddrSpace);
1237 if (CFP->getType()->isX86_FP80Ty()) {
1238 // all long double variants are printed as hex
1239 // api needed to prevent premature destruction
1240 APInt API = CFP->getValueAPF().bitcastToAPInt();
1241 const uint64_t *p = API.getRawData();
1242 if (AP.isVerbose()) {
1243 // Convert to double so we can print the approximate val as a comment.
1244 APFloat DoubleVal = CFP->getValueAPF();
1246 DoubleVal.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven,
1248 AP.OutStreamer.GetCommentOS() << "x86_fp80 ~= "
1249 << DoubleVal.convertToDouble() << '\n';
1252 if (AP.TM.getTargetData()->isBigEndian()) {
1253 AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace);
1254 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1256 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1257 AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace);
1260 // Emit the tail padding for the long double.
1261 const TargetData &TD = *AP.TM.getTargetData();
1262 AP.OutStreamer.EmitZeros(TD.getTypeAllocSize(CFP->getType()) -
1263 TD.getTypeStoreSize(CFP->getType()), AddrSpace);
1267 assert(CFP->getType()->isPPC_FP128Ty() &&
1268 "Floating point constant type not handled");
1269 // All long double variants are printed as hex api needed to prevent
1270 // premature destruction.
1271 APInt API = CFP->getValueAPF().bitcastToAPInt();
1272 const uint64_t *p = API.getRawData();
1273 if (AP.TM.getTargetData()->isBigEndian()) {
1274 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1275 AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace);
1277 AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace);
1278 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1282 static void EmitGlobalConstantLargeInt(const ConstantInt *CI,
1283 unsigned AddrSpace, AsmPrinter &AP) {
1284 const TargetData *TD = AP.TM.getTargetData();
1285 unsigned BitWidth = CI->getBitWidth();
1286 assert((BitWidth & 63) == 0 && "only support multiples of 64-bits");
1288 // We don't expect assemblers to support integer data directives
1289 // for more than 64 bits, so we emit the data in at most 64-bit
1290 // quantities at a time.
1291 const uint64_t *RawData = CI->getValue().getRawData();
1292 for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) {
1293 uint64_t Val = TD->isBigEndian() ? RawData[e - i - 1] : RawData[i];
1294 AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace);
1298 /// EmitGlobalConstant - Print a general LLVM constant to the .s file.
1299 void AsmPrinter::EmitGlobalConstant(const Constant *CV, unsigned AddrSpace) {
1300 if (isa<ConstantAggregateZero>(CV) || isa<UndefValue>(CV)) {
1301 uint64_t Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
1302 if (Size == 0) Size = 1; // An empty "_foo:" followed by a section is undef.
1303 return OutStreamer.EmitZeros(Size, AddrSpace);
1306 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
1307 unsigned Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
1314 OutStreamer.GetCommentOS() << format("0x%llx\n", CI->getZExtValue());
1315 OutStreamer.EmitIntValue(CI->getZExtValue(), Size, AddrSpace);
1318 EmitGlobalConstantLargeInt(CI, AddrSpace, *this);
1323 if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV))
1324 return EmitGlobalConstantArray(CVA, AddrSpace, *this);
1326 if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV))
1327 return EmitGlobalConstantStruct(CVS, AddrSpace, *this);
1329 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV))
1330 return EmitGlobalConstantFP(CFP, AddrSpace, *this);
1332 if (isa<ConstantPointerNull>(CV)) {
1333 unsigned Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
1334 OutStreamer.EmitIntValue(0, Size, AddrSpace);
1338 if (const ConstantUnion *CVU = dyn_cast<ConstantUnion>(CV))
1339 return EmitGlobalConstantUnion(CVU, AddrSpace, *this);
1341 if (const ConstantVector *V = dyn_cast<ConstantVector>(CV))
1342 return EmitGlobalConstantVector(V, AddrSpace, *this);
1344 // Otherwise, it must be a ConstantExpr. Lower it to an MCExpr, then emit it
1345 // thread the streamer with EmitValue.
1346 OutStreamer.EmitValue(LowerConstant(CV, *this),
1347 TM.getTargetData()->getTypeAllocSize(CV->getType()),
1351 void AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
1352 // Target doesn't support this yet!
1353 llvm_unreachable("Target does not support EmitMachineConstantPoolValue");
1356 void AsmPrinter::printOffset(int64_t Offset, raw_ostream &OS) const {
1358 OS << '+' << Offset;
1359 else if (Offset < 0)
1363 //===----------------------------------------------------------------------===//
1364 // Symbol Lowering Routines.
1365 //===----------------------------------------------------------------------===//
1367 /// GetTempSymbol - Return the MCSymbol corresponding to the assembler
1368 /// temporary label with the specified stem and unique ID.
1369 MCSymbol *AsmPrinter::GetTempSymbol(StringRef Name, unsigned ID) const {
1370 return OutContext.GetOrCreateSymbol(Twine(MAI->getPrivateGlobalPrefix()) +
1374 /// GetTempSymbol - Return an assembler temporary label with the specified
1376 MCSymbol *AsmPrinter::GetTempSymbol(StringRef Name) const {
1377 return OutContext.GetOrCreateSymbol(Twine(MAI->getPrivateGlobalPrefix())+
1382 MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BlockAddress *BA) const {
1383 return MMI->getAddrLabelSymbol(BA->getBasicBlock());
1386 MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BasicBlock *BB) const {
1387 return MMI->getAddrLabelSymbol(BB);
1390 /// GetCPISymbol - Return the symbol for the specified constant pool entry.
1391 MCSymbol *AsmPrinter::GetCPISymbol(unsigned CPID) const {
1392 return OutContext.GetOrCreateSymbol
1393 (Twine(MAI->getPrivateGlobalPrefix()) + "CPI" + Twine(getFunctionNumber())
1394 + "_" + Twine(CPID));
1397 /// GetJTISymbol - Return the symbol for the specified jump table entry.
1398 MCSymbol *AsmPrinter::GetJTISymbol(unsigned JTID, bool isLinkerPrivate) const {
1399 return MF->getJTISymbol(JTID, OutContext, isLinkerPrivate);
1402 /// GetJTSetSymbol - Return the symbol for the specified jump table .set
1403 /// FIXME: privatize to AsmPrinter.
1404 MCSymbol *AsmPrinter::GetJTSetSymbol(unsigned UID, unsigned MBBID) const {
1405 return OutContext.GetOrCreateSymbol
1406 (Twine(MAI->getPrivateGlobalPrefix()) + Twine(getFunctionNumber()) + "_" +
1407 Twine(UID) + "_set_" + Twine(MBBID));
1410 /// GetSymbolWithGlobalValueBase - Return the MCSymbol for a symbol with
1411 /// global value name as its base, with the specified suffix, and where the
1412 /// symbol is forced to have private linkage if ForcePrivate is true.
1413 MCSymbol *AsmPrinter::GetSymbolWithGlobalValueBase(const GlobalValue *GV,
1415 bool ForcePrivate) const {
1416 SmallString<60> NameStr;
1417 Mang->getNameWithPrefix(NameStr, GV, ForcePrivate);
1418 NameStr.append(Suffix.begin(), Suffix.end());
1419 return OutContext.GetOrCreateSymbol(NameStr.str());
1422 /// GetExternalSymbolSymbol - Return the MCSymbol for the specified
1424 MCSymbol *AsmPrinter::GetExternalSymbolSymbol(StringRef Sym) const {
1425 SmallString<60> NameStr;
1426 Mang->getNameWithPrefix(NameStr, Sym);
1427 return OutContext.GetOrCreateSymbol(NameStr.str());
1432 /// PrintParentLoopComment - Print comments about parent loops of this one.
1433 static void PrintParentLoopComment(raw_ostream &OS, const MachineLoop *Loop,
1434 unsigned FunctionNumber) {
1435 if (Loop == 0) return;
1436 PrintParentLoopComment(OS, Loop->getParentLoop(), FunctionNumber);
1437 OS.indent(Loop->getLoopDepth()*2)
1438 << "Parent Loop BB" << FunctionNumber << "_"
1439 << Loop->getHeader()->getNumber()
1440 << " Depth=" << Loop->getLoopDepth() << '\n';
1444 /// PrintChildLoopComment - Print comments about child loops within
1445 /// the loop for this basic block, with nesting.
1446 static void PrintChildLoopComment(raw_ostream &OS, const MachineLoop *Loop,
1447 unsigned FunctionNumber) {
1448 // Add child loop information
1449 for (MachineLoop::iterator CL = Loop->begin(), E = Loop->end();CL != E; ++CL){
1450 OS.indent((*CL)->getLoopDepth()*2)
1451 << "Child Loop BB" << FunctionNumber << "_"
1452 << (*CL)->getHeader()->getNumber() << " Depth " << (*CL)->getLoopDepth()
1454 PrintChildLoopComment(OS, *CL, FunctionNumber);
1458 /// EmitBasicBlockLoopComments - Pretty-print comments for basic blocks.
1459 static void EmitBasicBlockLoopComments(const MachineBasicBlock &MBB,
1460 const MachineLoopInfo *LI,
1461 const AsmPrinter &AP) {
1462 // Add loop depth information
1463 const MachineLoop *Loop = LI->getLoopFor(&MBB);
1464 if (Loop == 0) return;
1466 MachineBasicBlock *Header = Loop->getHeader();
1467 assert(Header && "No header for loop");
1469 // If this block is not a loop header, just print out what is the loop header
1471 if (Header != &MBB) {
1472 AP.OutStreamer.AddComment(" in Loop: Header=BB" +
1473 Twine(AP.getFunctionNumber())+"_" +
1474 Twine(Loop->getHeader()->getNumber())+
1475 " Depth="+Twine(Loop->getLoopDepth()));
1479 // Otherwise, it is a loop header. Print out information about child and
1481 raw_ostream &OS = AP.OutStreamer.GetCommentOS();
1483 PrintParentLoopComment(OS, Loop->getParentLoop(), AP.getFunctionNumber());
1486 OS.indent(Loop->getLoopDepth()*2-2);
1491 OS << "Loop Header: Depth=" + Twine(Loop->getLoopDepth()) << '\n';
1493 PrintChildLoopComment(OS, Loop, AP.getFunctionNumber());
1497 /// EmitBasicBlockStart - This method prints the label for the specified
1498 /// MachineBasicBlock, an alignment (if present) and a comment describing
1499 /// it if appropriate.
1500 void AsmPrinter::EmitBasicBlockStart(const MachineBasicBlock *MBB) const {
1501 // Emit an alignment directive for this block, if needed.
1502 if (unsigned Align = MBB->getAlignment())
1503 EmitAlignment(Log2_32(Align));
1505 // If the block has its address taken, emit any labels that were used to
1506 // reference the block. It is possible that there is more than one label
1507 // here, because multiple LLVM BB's may have been RAUW'd to this block after
1508 // the references were generated.
1509 if (MBB->hasAddressTaken()) {
1510 const BasicBlock *BB = MBB->getBasicBlock();
1512 OutStreamer.AddComment("Block address taken");
1514 std::vector<MCSymbol*> Syms = MMI->getAddrLabelSymbolToEmit(BB);
1516 for (unsigned i = 0, e = Syms.size(); i != e; ++i)
1517 OutStreamer.EmitLabel(Syms[i]);
1520 // Print the main label for the block.
1521 if (MBB->pred_empty() || isBlockOnlyReachableByFallthrough(MBB)) {
1522 if (isVerbose() && OutStreamer.hasRawTextSupport()) {
1523 if (const BasicBlock *BB = MBB->getBasicBlock())
1525 OutStreamer.AddComment("%" + BB->getName());
1527 EmitBasicBlockLoopComments(*MBB, LI, *this);
1529 // NOTE: Want this comment at start of line, don't emit with AddComment.
1530 OutStreamer.EmitRawText(Twine(MAI->getCommentString()) + " BB#" +
1531 Twine(MBB->getNumber()) + ":");
1535 if (const BasicBlock *BB = MBB->getBasicBlock())
1537 OutStreamer.AddComment("%" + BB->getName());
1538 EmitBasicBlockLoopComments(*MBB, LI, *this);
1541 OutStreamer.EmitLabel(MBB->getSymbol());
1545 void AsmPrinter::EmitVisibility(MCSymbol *Sym, unsigned Visibility) const {
1546 MCSymbolAttr Attr = MCSA_Invalid;
1548 switch (Visibility) {
1550 case GlobalValue::HiddenVisibility:
1551 Attr = MAI->getHiddenVisibilityAttr();
1553 case GlobalValue::ProtectedVisibility:
1554 Attr = MAI->getProtectedVisibilityAttr();
1558 if (Attr != MCSA_Invalid)
1559 OutStreamer.EmitSymbolAttribute(Sym, Attr);
1562 /// isBlockOnlyReachableByFallthough - Return true if the basic block has
1563 /// exactly one predecessor and the control transfer mechanism between
1564 /// the predecessor and this block is a fall-through.
1566 isBlockOnlyReachableByFallthrough(const MachineBasicBlock *MBB) const {
1567 // If this is a landing pad, it isn't a fall through. If it has no preds,
1568 // then nothing falls through to it.
1569 if (MBB->isLandingPad() || MBB->pred_empty())
1572 // If there isn't exactly one predecessor, it can't be a fall through.
1573 MachineBasicBlock::const_pred_iterator PI = MBB->pred_begin(), PI2 = PI;
1575 if (PI2 != MBB->pred_end())
1578 // The predecessor has to be immediately before this block.
1579 const MachineBasicBlock *Pred = *PI;
1581 if (!Pred->isLayoutSuccessor(MBB))
1584 // If the block is completely empty, then it definitely does fall through.
1588 // Otherwise, check the last instruction.
1589 const MachineInstr &LastInst = Pred->back();
1590 return !LastInst.getDesc().isBarrier();
1595 GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy *S) {
1596 if (!S->usesMetadata())
1599 gcp_map_type &GCMap = getGCMap(GCMetadataPrinters);
1600 gcp_map_type::iterator GCPI = GCMap.find(S);
1601 if (GCPI != GCMap.end())
1602 return GCPI->second;
1604 const char *Name = S->getName().c_str();
1606 for (GCMetadataPrinterRegistry::iterator
1607 I = GCMetadataPrinterRegistry::begin(),
1608 E = GCMetadataPrinterRegistry::end(); I != E; ++I)
1609 if (strcmp(Name, I->getName()) == 0) {
1610 GCMetadataPrinter *GMP = I->instantiate();
1612 GCMap.insert(std::make_pair(S, GMP));
1616 llvm_report_error("no GCMetadataPrinter registered for GC: " + Twine(Name));