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 "llvm/Module.h"
17 #include "llvm/CodeGen/DwarfWriter.h"
18 #include "llvm/CodeGen/GCMetadataPrinter.h"
19 #include "llvm/CodeGen/MachineConstantPool.h"
20 #include "llvm/CodeGen/MachineFrameInfo.h"
21 #include "llvm/CodeGen/MachineFunction.h"
22 #include "llvm/CodeGen/MachineJumpTableInfo.h"
23 #include "llvm/CodeGen/MachineLoopInfo.h"
24 #include "llvm/CodeGen/MachineModuleInfo.h"
25 #include "llvm/Analysis/ConstantFolding.h"
26 #include "llvm/Analysis/DebugInfo.h"
27 #include "llvm/MC/MCAsmInfo.h"
28 #include "llvm/MC/MCContext.h"
29 #include "llvm/MC/MCExpr.h"
30 #include "llvm/MC/MCInst.h"
31 #include "llvm/MC/MCSection.h"
32 #include "llvm/MC/MCStreamer.h"
33 #include "llvm/MC/MCSymbol.h"
34 #include "llvm/Target/Mangler.h"
35 #include "llvm/Target/TargetData.h"
36 #include "llvm/Target/TargetInstrInfo.h"
37 #include "llvm/Target/TargetLowering.h"
38 #include "llvm/Target/TargetLoweringObjectFile.h"
39 #include "llvm/Target/TargetOptions.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 DW = 0; MMI = 0; LI = 0;
66 GCMetadataPrinters = 0;
67 VerboseAsm = Streamer.isVerboseAsm();
70 AsmPrinter::~AsmPrinter() {
71 if (GCMetadataPrinters != 0) {
72 gcp_map_type &GCMap = getGCMap(GCMetadataPrinters);
74 for (gcp_map_type::iterator I = GCMap.begin(), E = GCMap.end(); I != E; ++I)
77 GCMetadataPrinters = 0;
83 /// getFunctionNumber - Return a unique ID for the current function.
85 unsigned AsmPrinter::getFunctionNumber() const {
86 return MF->getFunctionNumber();
89 TargetLoweringObjectFile &AsmPrinter::getObjFileLowering() const {
90 return TM.getTargetLowering()->getObjFileLowering();
93 /// getCurrentSection() - Return the current section we are emitting to.
94 const MCSection *AsmPrinter::getCurrentSection() const {
95 return OutStreamer.getCurrentSection();
99 void AsmPrinter::getAnalysisUsage(AnalysisUsage &AU) const {
100 AU.setPreservesAll();
101 MachineFunctionPass::getAnalysisUsage(AU);
102 AU.addRequired<MachineModuleInfo>();
103 AU.addRequired<GCModuleInfo>();
105 AU.addRequired<MachineLoopInfo>();
108 bool AsmPrinter::doInitialization(Module &M) {
109 MMI = getAnalysisIfAvailable<MachineModuleInfo>();
110 MMI->AnalyzeModule(M);
112 // Initialize TargetLoweringObjectFile.
113 const_cast<TargetLoweringObjectFile&>(getObjFileLowering())
114 .Initialize(OutContext, TM);
116 Mang = new Mangler(OutContext, *TM.getTargetData());
118 // Allow the target to emit any magic that it wants at the start of the file.
119 EmitStartOfAsmFile(M);
121 // Very minimal debug info. It is ignored if we emit actual debug info. If we
122 // don't, this at least helps the user find where a global came from.
123 if (MAI->hasSingleParameterDotFile()) {
125 OutStreamer.EmitFileDirective(M.getModuleIdentifier());
128 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
129 assert(MI && "AsmPrinter didn't require GCModuleInfo?");
130 for (GCModuleInfo::iterator I = MI->begin(), E = MI->end(); I != E; ++I)
131 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I))
132 MP->beginAssembly(*this);
134 // Emit module-level inline asm if it exists.
135 if (!M.getModuleInlineAsm().empty()) {
136 OutStreamer.AddComment("Start of file scope inline assembly");
137 OutStreamer.AddBlankLine();
138 EmitInlineAsm(M.getModuleInlineAsm());
139 OutStreamer.AddComment("End of file scope inline assembly");
140 OutStreamer.AddBlankLine();
143 DW = getAnalysisIfAvailable<DwarfWriter>();
145 DW->BeginModule(&M, this);
150 void AsmPrinter::EmitLinkage(unsigned Linkage, MCSymbol *GVSym) const {
151 switch ((GlobalValue::LinkageTypes)Linkage) {
152 case GlobalValue::CommonLinkage:
153 case GlobalValue::LinkOnceAnyLinkage:
154 case GlobalValue::LinkOnceODRLinkage:
155 case GlobalValue::WeakAnyLinkage:
156 case GlobalValue::WeakODRLinkage:
157 case GlobalValue::LinkerPrivateLinkage:
158 if (MAI->getWeakDefDirective() != 0) {
160 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
161 // .weak_definition _foo
162 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_WeakDefinition);
163 } else if (const char *LinkOnce = MAI->getLinkOnceDirective()) {
165 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
166 // FIXME: linkonce should be a section attribute, handled by COFF Section
168 // http://sourceware.org/binutils/docs-2.20/as/Linkonce.html#Linkonce
170 // FIXME: It would be nice to use .linkonce samesize for non-common
172 OutStreamer.EmitRawText(StringRef(LinkOnce));
175 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Weak);
178 case GlobalValue::DLLExportLinkage:
179 case GlobalValue::AppendingLinkage:
180 // FIXME: appending linkage variables should go into a section of
181 // their name or something. For now, just emit them as external.
182 case GlobalValue::ExternalLinkage:
183 // If external or appending, declare as a global symbol.
185 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
187 case GlobalValue::PrivateLinkage:
188 case GlobalValue::InternalLinkage:
191 llvm_unreachable("Unknown linkage type!");
196 /// EmitGlobalVariable - Emit the specified global variable to the .s file.
197 void AsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) {
198 if (!GV->hasInitializer()) // External globals require no code.
201 // Check to see if this is a special global used by LLVM, if so, emit it.
202 if (EmitSpecialLLVMGlobal(GV))
205 MCSymbol *GVSym = Mang->getSymbol(GV);
206 EmitVisibility(GVSym, GV->getVisibility());
208 if (MAI->hasDotTypeDotSizeDirective())
209 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_ELF_TypeObject);
211 SectionKind GVKind = TargetLoweringObjectFile::getKindForGlobal(GV, TM);
213 const TargetData *TD = TM.getTargetData();
214 unsigned Size = TD->getTypeAllocSize(GV->getType()->getElementType());
215 unsigned AlignLog = TD->getPreferredAlignmentLog(GV);
217 // Handle common and BSS local symbols (.lcomm).
218 if (GVKind.isCommon() || GVKind.isBSSLocal()) {
219 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
222 WriteAsOperand(OutStreamer.GetCommentOS(), GV,
223 /*PrintType=*/false, GV->getParent());
224 OutStreamer.GetCommentOS() << '\n';
227 // Handle common symbols.
228 if (GVKind.isCommon()) {
230 OutStreamer.EmitCommonSymbol(GVSym, Size, 1 << AlignLog);
234 // Handle local BSS symbols.
235 if (MAI->hasMachoZeroFillDirective()) {
236 const MCSection *TheSection =
237 getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM);
238 // .zerofill __DATA, __bss, _foo, 400, 5
239 OutStreamer.EmitZerofill(TheSection, GVSym, Size, 1 << AlignLog);
243 if (MAI->hasLCOMMDirective()) {
245 OutStreamer.EmitLocalCommonSymbol(GVSym, Size);
250 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Local);
252 OutStreamer.EmitCommonSymbol(GVSym, Size, 1 << AlignLog);
256 const MCSection *TheSection =
257 getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM);
259 // Handle the zerofill directive on darwin, which is a special form of BSS
261 if (GVKind.isBSSExtern() && MAI->hasMachoZeroFillDirective()) {
263 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
264 // .zerofill __DATA, __common, _foo, 400, 5
265 OutStreamer.EmitZerofill(TheSection, GVSym, Size, 1 << AlignLog);
269 OutStreamer.SwitchSection(TheSection);
271 EmitLinkage(GV->getLinkage(), GVSym);
272 EmitAlignment(AlignLog, GV);
275 WriteAsOperand(OutStreamer.GetCommentOS(), GV,
276 /*PrintType=*/false, GV->getParent());
277 OutStreamer.GetCommentOS() << '\n';
279 OutStreamer.EmitLabel(GVSym);
281 EmitGlobalConstant(GV->getInitializer());
283 if (MAI->hasDotTypeDotSizeDirective())
285 OutStreamer.EmitELFSize(GVSym, MCConstantExpr::Create(Size, OutContext));
287 OutStreamer.AddBlankLine();
290 /// EmitFunctionHeader - This method emits the header for the current
292 void AsmPrinter::EmitFunctionHeader() {
293 // Print out constants referenced by the function
296 // Print the 'header' of function.
297 const Function *F = MF->getFunction();
299 OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang, TM));
300 EmitVisibility(CurrentFnSym, F->getVisibility());
302 EmitLinkage(F->getLinkage(), CurrentFnSym);
303 EmitAlignment(MF->getAlignment(), F);
305 if (MAI->hasDotTypeDotSizeDirective())
306 OutStreamer.EmitSymbolAttribute(CurrentFnSym, MCSA_ELF_TypeFunction);
309 WriteAsOperand(OutStreamer.GetCommentOS(), F,
310 /*PrintType=*/false, F->getParent());
311 OutStreamer.GetCommentOS() << '\n';
314 // Emit the CurrentFnSym. This is a virtual function to allow targets to
315 // do their wild and crazy things as required.
316 EmitFunctionEntryLabel();
318 // If the function had address-taken blocks that got deleted, then we have
319 // references to the dangling symbols. Emit them at the start of the function
320 // so that we don't get references to undefined symbols.
321 std::vector<MCSymbol*> DeadBlockSyms;
322 MMI->takeDeletedSymbolsForFunction(F, DeadBlockSyms);
323 for (unsigned i = 0, e = DeadBlockSyms.size(); i != e; ++i) {
324 OutStreamer.AddComment("Address taken block that was later removed");
325 OutStreamer.EmitLabel(DeadBlockSyms[i]);
328 // Add some workaround for linkonce linkage on Cygwin\MinGW.
329 if (MAI->getLinkOnceDirective() != 0 &&
330 (F->hasLinkOnceLinkage() || F->hasWeakLinkage())) {
331 // FIXME: What is this?
333 OutContext.GetOrCreateSymbol(Twine("Lllvm$workaround$fake$stub$")+
334 CurrentFnSym->getName());
335 OutStreamer.EmitLabel(FakeStub);
338 // Emit pre-function debug and/or EH information.
339 if (MAI->doesSupportDebugInformation() || MAI->doesSupportExceptionHandling())
340 DW->BeginFunction(MF);
343 /// EmitFunctionEntryLabel - Emit the label that is the entrypoint for the
344 /// function. This can be overridden by targets as required to do custom stuff.
345 void AsmPrinter::EmitFunctionEntryLabel() {
346 OutStreamer.EmitLabel(CurrentFnSym);
350 /// EmitComments - Pretty-print comments for instructions.
351 static void EmitComments(const MachineInstr &MI, raw_ostream &CommentOS) {
352 const MachineFunction *MF = MI.getParent()->getParent();
353 const TargetMachine &TM = MF->getTarget();
355 DebugLoc DL = MI.getDebugLoc();
356 if (!DL.isUnknown()) { // Print source line info.
357 DIScope Scope(DL.getScope(MF->getFunction()->getContext()));
358 // Omit the directory, because it's likely to be long and uninteresting.
360 CommentOS << Scope.getFilename();
362 CommentOS << "<unknown>";
363 CommentOS << ':' << DL.getLine();
364 if (DL.getCol() != 0)
365 CommentOS << ':' << DL.getCol();
369 // Check for spills and reloads
372 const MachineFrameInfo *FrameInfo = MF->getFrameInfo();
374 // We assume a single instruction only has a spill or reload, not
376 const MachineMemOperand *MMO;
377 if (TM.getInstrInfo()->isLoadFromStackSlotPostFE(&MI, FI)) {
378 if (FrameInfo->isSpillSlotObjectIndex(FI)) {
379 MMO = *MI.memoperands_begin();
380 CommentOS << MMO->getSize() << "-byte Reload\n";
382 } else if (TM.getInstrInfo()->hasLoadFromStackSlot(&MI, MMO, FI)) {
383 if (FrameInfo->isSpillSlotObjectIndex(FI))
384 CommentOS << MMO->getSize() << "-byte Folded Reload\n";
385 } else if (TM.getInstrInfo()->isStoreToStackSlotPostFE(&MI, FI)) {
386 if (FrameInfo->isSpillSlotObjectIndex(FI)) {
387 MMO = *MI.memoperands_begin();
388 CommentOS << MMO->getSize() << "-byte Spill\n";
390 } else if (TM.getInstrInfo()->hasStoreToStackSlot(&MI, MMO, FI)) {
391 if (FrameInfo->isSpillSlotObjectIndex(FI))
392 CommentOS << MMO->getSize() << "-byte Folded Spill\n";
395 // Check for spill-induced copies
396 unsigned SrcReg, DstReg, SrcSubIdx, DstSubIdx;
397 if (TM.getInstrInfo()->isMoveInstr(MI, SrcReg, DstReg,
398 SrcSubIdx, DstSubIdx)) {
399 if (MI.getAsmPrinterFlag(MachineInstr::ReloadReuse))
400 CommentOS << " Reload Reuse\n";
404 /// EmitImplicitDef - This method emits the specified machine instruction
405 /// that is an implicit def.
406 static void EmitImplicitDef(const MachineInstr *MI, AsmPrinter &AP) {
407 unsigned RegNo = MI->getOperand(0).getReg();
408 AP.OutStreamer.AddComment(Twine("implicit-def: ") +
409 AP.TM.getRegisterInfo()->getName(RegNo));
410 AP.OutStreamer.AddBlankLine();
413 static void EmitKill(const MachineInstr *MI, AsmPrinter &AP) {
414 std::string Str = "kill:";
415 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
416 const MachineOperand &Op = MI->getOperand(i);
417 assert(Op.isReg() && "KILL instruction must have only register operands");
419 Str += AP.TM.getRegisterInfo()->getName(Op.getReg());
420 Str += (Op.isDef() ? "<def>" : "<kill>");
422 AP.OutStreamer.AddComment(Str);
423 AP.OutStreamer.AddBlankLine();
428 /// EmitFunctionBody - This method emits the body and trailer for a
430 void AsmPrinter::EmitFunctionBody() {
431 // Emit target-specific gunk before the function body.
432 EmitFunctionBodyStart();
434 bool ShouldPrintDebugScopes =
435 DW && MAI->doesSupportDebugInformation() &&DW->ShouldEmitDwarfDebug();
437 // Print out code for the function.
438 bool HasAnyRealCode = false;
439 for (MachineFunction::const_iterator I = MF->begin(), E = MF->end();
441 // Print a label for the basic block.
442 EmitBasicBlockStart(I);
443 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
445 // Print the assembly for the instruction.
447 HasAnyRealCode = true;
451 if (ShouldPrintDebugScopes)
455 EmitComments(*II, OutStreamer.GetCommentOS());
457 switch (II->getOpcode()) {
458 case TargetOpcode::DBG_LABEL:
459 case TargetOpcode::EH_LABEL:
460 case TargetOpcode::GC_LABEL:
461 OutStreamer.EmitLabel(II->getOperand(0).getMCSymbol());
463 case TargetOpcode::INLINEASM:
466 case TargetOpcode::IMPLICIT_DEF:
467 if (isVerbose()) EmitImplicitDef(II, *this);
469 case TargetOpcode::KILL:
470 if (isVerbose()) EmitKill(II, *this);
477 if (ShouldPrintDebugScopes)
482 // If the function is empty and the object file uses .subsections_via_symbols,
483 // then we need to emit *something* to the function body to prevent the
484 // labels from collapsing together. Just emit a 0 byte.
485 if (MAI->hasSubsectionsViaSymbols() && !HasAnyRealCode)
486 OutStreamer.EmitIntValue(0, 1, 0/*addrspace*/);
488 // Emit target-specific gunk after the function body.
489 EmitFunctionBodyEnd();
491 // If the target wants a .size directive for the size of the function, emit
493 if (MAI->hasDotTypeDotSizeDirective()) {
494 // Create a symbol for the end of function, so we can get the size as
495 // difference between the function label and the temp label.
496 MCSymbol *FnEndLabel = OutContext.CreateTempSymbol();
497 OutStreamer.EmitLabel(FnEndLabel);
499 const MCExpr *SizeExp =
500 MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(FnEndLabel, OutContext),
501 MCSymbolRefExpr::Create(CurrentFnSym, OutContext),
503 OutStreamer.EmitELFSize(CurrentFnSym, SizeExp);
506 // Emit post-function debug information.
507 if (MAI->doesSupportDebugInformation() || MAI->doesSupportExceptionHandling())
510 // Print out jump tables referenced by the function.
513 OutStreamer.AddBlankLine();
517 bool AsmPrinter::doFinalization(Module &M) {
518 // Emit global variables.
519 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
521 EmitGlobalVariable(I);
523 // Emit final debug information.
524 if (MAI->doesSupportDebugInformation() || MAI->doesSupportExceptionHandling())
527 // If the target wants to know about weak references, print them all.
528 if (MAI->getWeakRefDirective()) {
529 // FIXME: This is not lazy, it would be nice to only print weak references
530 // to stuff that is actually used. Note that doing so would require targets
531 // to notice uses in operands (due to constant exprs etc). This should
532 // happen with the MC stuff eventually.
534 // Print out module-level global variables here.
535 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
537 if (!I->hasExternalWeakLinkage()) continue;
538 OutStreamer.EmitSymbolAttribute(Mang->getSymbol(I), MCSA_WeakReference);
541 for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I) {
542 if (!I->hasExternalWeakLinkage()) continue;
543 OutStreamer.EmitSymbolAttribute(Mang->getSymbol(I), MCSA_WeakReference);
547 if (MAI->hasSetDirective()) {
548 OutStreamer.AddBlankLine();
549 for (Module::const_alias_iterator I = M.alias_begin(), E = M.alias_end();
551 MCSymbol *Name = Mang->getSymbol(I);
553 const GlobalValue *GV = cast<GlobalValue>(I->getAliasedGlobal());
554 MCSymbol *Target = Mang->getSymbol(GV);
556 if (I->hasExternalLinkage() || !MAI->getWeakRefDirective())
557 OutStreamer.EmitSymbolAttribute(Name, MCSA_Global);
558 else if (I->hasWeakLinkage())
559 OutStreamer.EmitSymbolAttribute(Name, MCSA_WeakReference);
561 assert(I->hasLocalLinkage() && "Invalid alias linkage");
563 EmitVisibility(Name, I->getVisibility());
565 // Emit the directives as assignments aka .set:
566 OutStreamer.EmitAssignment(Name,
567 MCSymbolRefExpr::Create(Target, OutContext));
571 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
572 assert(MI && "AsmPrinter didn't require GCModuleInfo?");
573 for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; )
574 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*--I))
575 MP->finishAssembly(*this);
577 // If we don't have any trampolines, then we don't require stack memory
578 // to be executable. Some targets have a directive to declare this.
579 Function *InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline");
580 if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty())
581 if (MCSection *S = MAI->getNonexecutableStackSection(OutContext))
582 OutStreamer.SwitchSection(S);
584 // Allow the target to emit any magic that it wants at the end of the file,
585 // after everything else has gone out.
588 delete Mang; Mang = 0;
591 OutStreamer.Finish();
595 void AsmPrinter::SetupMachineFunction(MachineFunction &MF) {
597 // Get the function symbol.
598 CurrentFnSym = Mang->getSymbol(MF.getFunction());
601 LI = &getAnalysis<MachineLoopInfo>();
605 // SectionCPs - Keep track the alignment, constpool entries per Section.
609 SmallVector<unsigned, 4> CPEs;
610 SectionCPs(const MCSection *s, unsigned a) : S(s), Alignment(a) {}
614 /// EmitConstantPool - Print to the current output stream assembly
615 /// representations of the constants in the constant pool MCP. This is
616 /// used to print out constants which have been "spilled to memory" by
617 /// the code generator.
619 void AsmPrinter::EmitConstantPool() {
620 const MachineConstantPool *MCP = MF->getConstantPool();
621 const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
622 if (CP.empty()) return;
624 // Calculate sections for constant pool entries. We collect entries to go into
625 // the same section together to reduce amount of section switch statements.
626 SmallVector<SectionCPs, 4> CPSections;
627 for (unsigned i = 0, e = CP.size(); i != e; ++i) {
628 const MachineConstantPoolEntry &CPE = CP[i];
629 unsigned Align = CPE.getAlignment();
632 switch (CPE.getRelocationInfo()) {
633 default: llvm_unreachable("Unknown section kind");
634 case 2: Kind = SectionKind::getReadOnlyWithRel(); break;
636 Kind = SectionKind::getReadOnlyWithRelLocal();
639 switch (TM.getTargetData()->getTypeAllocSize(CPE.getType())) {
640 case 4: Kind = SectionKind::getMergeableConst4(); break;
641 case 8: Kind = SectionKind::getMergeableConst8(); break;
642 case 16: Kind = SectionKind::getMergeableConst16();break;
643 default: Kind = SectionKind::getMergeableConst(); break;
647 const MCSection *S = getObjFileLowering().getSectionForConstant(Kind);
649 // The number of sections are small, just do a linear search from the
650 // last section to the first.
652 unsigned SecIdx = CPSections.size();
653 while (SecIdx != 0) {
654 if (CPSections[--SecIdx].S == S) {
660 SecIdx = CPSections.size();
661 CPSections.push_back(SectionCPs(S, Align));
664 if (Align > CPSections[SecIdx].Alignment)
665 CPSections[SecIdx].Alignment = Align;
666 CPSections[SecIdx].CPEs.push_back(i);
669 // Now print stuff into the calculated sections.
670 for (unsigned i = 0, e = CPSections.size(); i != e; ++i) {
671 OutStreamer.SwitchSection(CPSections[i].S);
672 EmitAlignment(Log2_32(CPSections[i].Alignment));
675 for (unsigned j = 0, ee = CPSections[i].CPEs.size(); j != ee; ++j) {
676 unsigned CPI = CPSections[i].CPEs[j];
677 MachineConstantPoolEntry CPE = CP[CPI];
679 // Emit inter-object padding for alignment.
680 unsigned AlignMask = CPE.getAlignment() - 1;
681 unsigned NewOffset = (Offset + AlignMask) & ~AlignMask;
682 OutStreamer.EmitFill(NewOffset - Offset, 0/*fillval*/, 0/*addrspace*/);
684 const Type *Ty = CPE.getType();
685 Offset = NewOffset + TM.getTargetData()->getTypeAllocSize(Ty);
687 // Emit the label with a comment on it.
689 OutStreamer.GetCommentOS() << "constant pool ";
690 WriteTypeSymbolic(OutStreamer.GetCommentOS(), CPE.getType(),
691 MF->getFunction()->getParent());
692 OutStreamer.GetCommentOS() << '\n';
694 OutStreamer.EmitLabel(GetCPISymbol(CPI));
696 if (CPE.isMachineConstantPoolEntry())
697 EmitMachineConstantPoolValue(CPE.Val.MachineCPVal);
699 EmitGlobalConstant(CPE.Val.ConstVal);
704 /// EmitJumpTableInfo - Print assembly representations of the jump tables used
705 /// by the current function to the current output stream.
707 void AsmPrinter::EmitJumpTableInfo() {
708 const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo();
709 if (MJTI == 0) return;
710 if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_Inline) return;
711 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
712 if (JT.empty()) return;
714 // Pick the directive to use to print the jump table entries, and switch to
715 // the appropriate section.
716 const Function *F = MF->getFunction();
717 bool JTInDiffSection = false;
718 if (// In PIC mode, we need to emit the jump table to the same section as the
719 // function body itself, otherwise the label differences won't make sense.
720 // FIXME: Need a better predicate for this: what about custom entries?
721 MJTI->getEntryKind() == MachineJumpTableInfo::EK_LabelDifference32 ||
722 // We should also do if the section name is NULL or function is declared
723 // in discardable section
724 // FIXME: this isn't the right predicate, should be based on the MCSection
726 F->isWeakForLinker()) {
727 OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F,Mang,TM));
729 // Otherwise, drop it in the readonly section.
730 const MCSection *ReadOnlySection =
731 getObjFileLowering().getSectionForConstant(SectionKind::getReadOnly());
732 OutStreamer.SwitchSection(ReadOnlySection);
733 JTInDiffSection = true;
736 EmitAlignment(Log2_32(MJTI->getEntryAlignment(*TM.getTargetData())));
738 for (unsigned JTI = 0, e = JT.size(); JTI != e; ++JTI) {
739 const std::vector<MachineBasicBlock*> &JTBBs = JT[JTI].MBBs;
741 // If this jump table was deleted, ignore it.
742 if (JTBBs.empty()) continue;
744 // For the EK_LabelDifference32 entry, if the target supports .set, emit a
745 // .set directive for each unique entry. This reduces the number of
746 // relocations the assembler will generate for the jump table.
747 if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_LabelDifference32 &&
748 MAI->hasSetDirective()) {
749 SmallPtrSet<const MachineBasicBlock*, 16> EmittedSets;
750 const TargetLowering *TLI = TM.getTargetLowering();
751 const MCExpr *Base = TLI->getPICJumpTableRelocBaseExpr(MF,JTI,OutContext);
752 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
753 const MachineBasicBlock *MBB = JTBBs[ii];
754 if (!EmittedSets.insert(MBB)) continue;
756 // .set LJTSet, LBB32-base
758 MCSymbolRefExpr::Create(MBB->getSymbol(), OutContext);
759 OutStreamer.EmitAssignment(GetJTSetSymbol(JTI, MBB->getNumber()),
760 MCBinaryExpr::CreateSub(LHS, Base, OutContext));
764 // On some targets (e.g. Darwin) we want to emit two consequtive labels
765 // before each jump table. The first label is never referenced, but tells
766 // the assembler and linker the extents of the jump table object. The
767 // second label is actually referenced by the code.
768 if (JTInDiffSection && MAI->getLinkerPrivateGlobalPrefix()[0])
769 // FIXME: This doesn't have to have any specific name, just any randomly
770 // named and numbered 'l' label would work. Simplify GetJTISymbol.
771 OutStreamer.EmitLabel(GetJTISymbol(JTI, true));
773 OutStreamer.EmitLabel(GetJTISymbol(JTI));
775 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
776 EmitJumpTableEntry(MJTI, JTBBs[ii], JTI);
780 /// EmitJumpTableEntry - Emit a jump table entry for the specified MBB to the
782 void AsmPrinter::EmitJumpTableEntry(const MachineJumpTableInfo *MJTI,
783 const MachineBasicBlock *MBB,
784 unsigned UID) const {
785 const MCExpr *Value = 0;
786 switch (MJTI->getEntryKind()) {
787 case MachineJumpTableInfo::EK_Inline:
788 llvm_unreachable("Cannot emit EK_Inline jump table entry"); break;
789 case MachineJumpTableInfo::EK_Custom32:
790 Value = TM.getTargetLowering()->LowerCustomJumpTableEntry(MJTI, MBB, UID,
793 case MachineJumpTableInfo::EK_BlockAddress:
794 // EK_BlockAddress - Each entry is a plain address of block, e.g.:
796 Value = MCSymbolRefExpr::Create(MBB->getSymbol(), OutContext);
798 case MachineJumpTableInfo::EK_GPRel32BlockAddress: {
799 // EK_GPRel32BlockAddress - Each entry is an address of block, encoded
800 // with a relocation as gp-relative, e.g.:
802 MCSymbol *MBBSym = MBB->getSymbol();
803 OutStreamer.EmitGPRel32Value(MCSymbolRefExpr::Create(MBBSym, OutContext));
807 case MachineJumpTableInfo::EK_LabelDifference32: {
808 // EK_LabelDifference32 - Each entry is the address of the block minus
809 // the address of the jump table. This is used for PIC jump tables where
810 // gprel32 is not supported. e.g.:
811 // .word LBB123 - LJTI1_2
812 // If the .set directive is supported, this is emitted as:
813 // .set L4_5_set_123, LBB123 - LJTI1_2
814 // .word L4_5_set_123
816 // If we have emitted set directives for the jump table entries, print
817 // them rather than the entries themselves. If we're emitting PIC, then
818 // emit the table entries as differences between two text section labels.
819 if (MAI->hasSetDirective()) {
820 // If we used .set, reference the .set's symbol.
821 Value = MCSymbolRefExpr::Create(GetJTSetSymbol(UID, MBB->getNumber()),
825 // Otherwise, use the difference as the jump table entry.
826 Value = MCSymbolRefExpr::Create(MBB->getSymbol(), OutContext);
827 const MCExpr *JTI = MCSymbolRefExpr::Create(GetJTISymbol(UID), OutContext);
828 Value = MCBinaryExpr::CreateSub(Value, JTI, OutContext);
833 assert(Value && "Unknown entry kind!");
835 unsigned EntrySize = MJTI->getEntrySize(*TM.getTargetData());
836 OutStreamer.EmitValue(Value, EntrySize, /*addrspace*/0);
840 /// EmitSpecialLLVMGlobal - Check to see if the specified global is a
841 /// special global used by LLVM. If so, emit it and return true, otherwise
842 /// do nothing and return false.
843 bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
844 if (GV->getName() == "llvm.used") {
845 if (MAI->hasNoDeadStrip()) // No need to emit this at all.
846 EmitLLVMUsedList(GV->getInitializer());
850 // Ignore debug and non-emitted data. This handles llvm.compiler.used.
851 if (GV->getSection() == "llvm.metadata" ||
852 GV->hasAvailableExternallyLinkage())
855 if (!GV->hasAppendingLinkage()) return false;
857 assert(GV->hasInitializer() && "Not a special LLVM global!");
859 const TargetData *TD = TM.getTargetData();
860 unsigned Align = Log2_32(TD->getPointerPrefAlignment());
861 if (GV->getName() == "llvm.global_ctors") {
862 OutStreamer.SwitchSection(getObjFileLowering().getStaticCtorSection());
863 EmitAlignment(Align, 0);
864 EmitXXStructorList(GV->getInitializer());
866 if (TM.getRelocationModel() == Reloc::Static &&
867 MAI->hasStaticCtorDtorReferenceInStaticMode()) {
868 StringRef Sym(".constructors_used");
869 OutStreamer.EmitSymbolAttribute(OutContext.GetOrCreateSymbol(Sym),
875 if (GV->getName() == "llvm.global_dtors") {
876 OutStreamer.SwitchSection(getObjFileLowering().getStaticDtorSection());
877 EmitAlignment(Align, 0);
878 EmitXXStructorList(GV->getInitializer());
880 if (TM.getRelocationModel() == Reloc::Static &&
881 MAI->hasStaticCtorDtorReferenceInStaticMode()) {
882 StringRef Sym(".destructors_used");
883 OutStreamer.EmitSymbolAttribute(OutContext.GetOrCreateSymbol(Sym),
892 /// EmitLLVMUsedList - For targets that define a MAI::UsedDirective, mark each
893 /// global in the specified llvm.used list for which emitUsedDirectiveFor
894 /// is true, as being used with this directive.
895 void AsmPrinter::EmitLLVMUsedList(Constant *List) {
896 // Should be an array of 'i8*'.
897 ConstantArray *InitList = dyn_cast<ConstantArray>(List);
898 if (InitList == 0) return;
900 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
901 const GlobalValue *GV =
902 dyn_cast<GlobalValue>(InitList->getOperand(i)->stripPointerCasts());
903 if (GV && getObjFileLowering().shouldEmitUsedDirectiveFor(GV, Mang))
904 OutStreamer.EmitSymbolAttribute(Mang->getSymbol(GV), MCSA_NoDeadStrip);
908 /// EmitXXStructorList - Emit the ctor or dtor list. This just prints out the
909 /// function pointers, ignoring the init priority.
910 void AsmPrinter::EmitXXStructorList(Constant *List) {
911 // Should be an array of '{ int, void ()* }' structs. The first value is the
912 // init priority, which we ignore.
913 if (!isa<ConstantArray>(List)) return;
914 ConstantArray *InitList = cast<ConstantArray>(List);
915 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
916 if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
917 if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
919 if (CS->getOperand(1)->isNullValue())
920 return; // Found a null terminator, exit printing.
921 // Emit the function pointer.
922 EmitGlobalConstant(CS->getOperand(1));
926 //===--------------------------------------------------------------------===//
927 // Emission and print routines
930 /// EmitInt8 - Emit a byte directive and value.
932 void AsmPrinter::EmitInt8(int Value) const {
933 OutStreamer.EmitIntValue(Value, 1, 0/*addrspace*/);
936 /// EmitInt16 - Emit a short directive and value.
938 void AsmPrinter::EmitInt16(int Value) const {
939 OutStreamer.EmitIntValue(Value, 2, 0/*addrspace*/);
942 /// EmitInt32 - Emit a long directive and value.
944 void AsmPrinter::EmitInt32(int Value) const {
945 OutStreamer.EmitIntValue(Value, 4, 0/*addrspace*/);
948 /// EmitLabelDifference - Emit something like ".long Hi-Lo" where the size
949 /// in bytes of the directive is specified by Size and Hi/Lo specify the
950 /// labels. This implicitly uses .set if it is available.
951 void AsmPrinter::EmitLabelDifference(const MCSymbol *Hi, const MCSymbol *Lo,
952 unsigned Size) const {
953 // Get the Hi-Lo expression.
955 MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(Hi, OutContext),
956 MCSymbolRefExpr::Create(Lo, OutContext),
959 if (!MAI->hasSetDirective()) {
960 OutStreamer.EmitValue(Diff, Size, 0/*AddrSpace*/);
964 // Otherwise, emit with .set (aka assignment).
965 MCSymbol *SetLabel = GetTempSymbol("set", SetCounter++);
966 OutStreamer.EmitAssignment(SetLabel, Diff);
967 OutStreamer.EmitSymbolValue(SetLabel, Size, 0/*AddrSpace*/);
971 //===----------------------------------------------------------------------===//
973 // EmitAlignment - Emit an alignment directive to the specified power of
974 // two boundary. For example, if you pass in 3 here, you will get an 8
975 // byte alignment. If a global value is specified, and if that global has
976 // an explicit alignment requested, it will unconditionally override the
977 // alignment request. However, if ForcedAlignBits is specified, this value
978 // has final say: the ultimate alignment will be the max of ForcedAlignBits
979 // and the alignment computed with NumBits and the global.
983 // if (GV && GV->hasalignment) Align = GV->getalignment();
984 // Align = std::max(Align, ForcedAlignBits);
986 void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV,
987 unsigned ForcedAlignBits,
988 bool UseFillExpr) const {
989 if (GV && GV->getAlignment())
990 NumBits = Log2_32(GV->getAlignment());
991 NumBits = std::max(NumBits, ForcedAlignBits);
993 if (NumBits == 0) return; // No need to emit alignment.
995 if (getCurrentSection()->getKind().isText())
996 OutStreamer.EmitCodeAlignment(1 << NumBits);
998 OutStreamer.EmitValueToAlignment(1 << NumBits, 0, 1, 0);
1001 /// LowerConstant - Lower the specified LLVM Constant to an MCExpr.
1003 static const MCExpr *LowerConstant(const Constant *CV, AsmPrinter &AP) {
1004 MCContext &Ctx = AP.OutContext;
1006 if (CV->isNullValue() || isa<UndefValue>(CV))
1007 return MCConstantExpr::Create(0, Ctx);
1009 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV))
1010 return MCConstantExpr::Create(CI->getZExtValue(), Ctx);
1012 if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV))
1013 return MCSymbolRefExpr::Create(AP.Mang->getSymbol(GV), Ctx);
1014 if (const BlockAddress *BA = dyn_cast<BlockAddress>(CV))
1015 return MCSymbolRefExpr::Create(AP.GetBlockAddressSymbol(BA), Ctx);
1017 const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV);
1019 llvm_unreachable("Unknown constant value to lower!");
1020 return MCConstantExpr::Create(0, Ctx);
1023 switch (CE->getOpcode()) {
1025 // If the code isn't optimized, there may be outstanding folding
1026 // opportunities. Attempt to fold the expression using TargetData as a
1027 // last resort before giving up.
1029 ConstantFoldConstantExpression(CE, AP.TM.getTargetData()))
1031 return LowerConstant(C, AP);
1035 llvm_unreachable("FIXME: Don't support this constant expr");
1036 case Instruction::GetElementPtr: {
1037 const TargetData &TD = *AP.TM.getTargetData();
1038 // Generate a symbolic expression for the byte address
1039 const Constant *PtrVal = CE->getOperand(0);
1040 SmallVector<Value*, 8> IdxVec(CE->op_begin()+1, CE->op_end());
1041 int64_t Offset = TD.getIndexedOffset(PtrVal->getType(), &IdxVec[0],
1044 const MCExpr *Base = LowerConstant(CE->getOperand(0), AP);
1048 // Truncate/sext the offset to the pointer size.
1049 if (TD.getPointerSizeInBits() != 64) {
1050 int SExtAmount = 64-TD.getPointerSizeInBits();
1051 Offset = (Offset << SExtAmount) >> SExtAmount;
1054 return MCBinaryExpr::CreateAdd(Base, MCConstantExpr::Create(Offset, Ctx),
1058 case Instruction::Trunc:
1059 // We emit the value and depend on the assembler to truncate the generated
1060 // expression properly. This is important for differences between
1061 // blockaddress labels. Since the two labels are in the same function, it
1062 // is reasonable to treat their delta as a 32-bit value.
1064 case Instruction::BitCast:
1065 return LowerConstant(CE->getOperand(0), AP);
1067 case Instruction::IntToPtr: {
1068 const TargetData &TD = *AP.TM.getTargetData();
1069 // Handle casts to pointers by changing them into casts to the appropriate
1070 // integer type. This promotes constant folding and simplifies this code.
1071 Constant *Op = CE->getOperand(0);
1072 Op = ConstantExpr::getIntegerCast(Op, TD.getIntPtrType(CV->getContext()),
1074 return LowerConstant(Op, AP);
1077 case Instruction::PtrToInt: {
1078 const TargetData &TD = *AP.TM.getTargetData();
1079 // Support only foldable casts to/from pointers that can be eliminated by
1080 // changing the pointer to the appropriately sized integer type.
1081 Constant *Op = CE->getOperand(0);
1082 const Type *Ty = CE->getType();
1084 const MCExpr *OpExpr = LowerConstant(Op, AP);
1086 // We can emit the pointer value into this slot if the slot is an
1087 // integer slot equal to the size of the pointer.
1088 if (TD.getTypeAllocSize(Ty) == TD.getTypeAllocSize(Op->getType()))
1091 // Otherwise the pointer is smaller than the resultant integer, mask off
1092 // the high bits so we are sure to get a proper truncation if the input is
1094 unsigned InBits = TD.getTypeAllocSizeInBits(Op->getType());
1095 const MCExpr *MaskExpr = MCConstantExpr::Create(~0ULL >> (64-InBits), Ctx);
1096 return MCBinaryExpr::CreateAnd(OpExpr, MaskExpr, Ctx);
1099 // The MC library also has a right-shift operator, but it isn't consistently
1100 // signed or unsigned between different targets.
1101 case Instruction::Add:
1102 case Instruction::Sub:
1103 case Instruction::Mul:
1104 case Instruction::SDiv:
1105 case Instruction::SRem:
1106 case Instruction::Shl:
1107 case Instruction::And:
1108 case Instruction::Or:
1109 case Instruction::Xor: {
1110 const MCExpr *LHS = LowerConstant(CE->getOperand(0), AP);
1111 const MCExpr *RHS = LowerConstant(CE->getOperand(1), AP);
1112 switch (CE->getOpcode()) {
1113 default: llvm_unreachable("Unknown binary operator constant cast expr");
1114 case Instruction::Add: return MCBinaryExpr::CreateAdd(LHS, RHS, Ctx);
1115 case Instruction::Sub: return MCBinaryExpr::CreateSub(LHS, RHS, Ctx);
1116 case Instruction::Mul: return MCBinaryExpr::CreateMul(LHS, RHS, Ctx);
1117 case Instruction::SDiv: return MCBinaryExpr::CreateDiv(LHS, RHS, Ctx);
1118 case Instruction::SRem: return MCBinaryExpr::CreateMod(LHS, RHS, Ctx);
1119 case Instruction::Shl: return MCBinaryExpr::CreateShl(LHS, RHS, Ctx);
1120 case Instruction::And: return MCBinaryExpr::CreateAnd(LHS, RHS, Ctx);
1121 case Instruction::Or: return MCBinaryExpr::CreateOr (LHS, RHS, Ctx);
1122 case Instruction::Xor: return MCBinaryExpr::CreateXor(LHS, RHS, Ctx);
1128 static void EmitGlobalConstantArray(const ConstantArray *CA, unsigned AddrSpace,
1130 if (AddrSpace != 0 || !CA->isString()) {
1131 // Not a string. Print the values in successive locations
1132 for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i)
1133 AP.EmitGlobalConstant(CA->getOperand(i), AddrSpace);
1137 // Otherwise, it can be emitted as .ascii.
1138 SmallVector<char, 128> TmpVec;
1139 TmpVec.reserve(CA->getNumOperands());
1140 for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i)
1141 TmpVec.push_back(cast<ConstantInt>(CA->getOperand(i))->getZExtValue());
1143 AP.OutStreamer.EmitBytes(StringRef(TmpVec.data(), TmpVec.size()), AddrSpace);
1146 static void EmitGlobalConstantVector(const ConstantVector *CV,
1147 unsigned AddrSpace, AsmPrinter &AP) {
1148 for (unsigned i = 0, e = CV->getType()->getNumElements(); i != e; ++i)
1149 AP.EmitGlobalConstant(CV->getOperand(i), AddrSpace);
1152 static void EmitGlobalConstantStruct(const ConstantStruct *CS,
1153 unsigned AddrSpace, AsmPrinter &AP) {
1154 // Print the fields in successive locations. Pad to align if needed!
1155 const TargetData *TD = AP.TM.getTargetData();
1156 unsigned Size = TD->getTypeAllocSize(CS->getType());
1157 const StructLayout *Layout = TD->getStructLayout(CS->getType());
1158 uint64_t SizeSoFar = 0;
1159 for (unsigned i = 0, e = CS->getNumOperands(); i != e; ++i) {
1160 const Constant *Field = CS->getOperand(i);
1162 // Check if padding is needed and insert one or more 0s.
1163 uint64_t FieldSize = TD->getTypeAllocSize(Field->getType());
1164 uint64_t PadSize = ((i == e-1 ? Size : Layout->getElementOffset(i+1))
1165 - Layout->getElementOffset(i)) - FieldSize;
1166 SizeSoFar += FieldSize + PadSize;
1168 // Now print the actual field value.
1169 AP.EmitGlobalConstant(Field, AddrSpace);
1171 // Insert padding - this may include padding to increase the size of the
1172 // current field up to the ABI size (if the struct is not packed) as well
1173 // as padding to ensure that the next field starts at the right offset.
1174 AP.OutStreamer.EmitZeros(PadSize, AddrSpace);
1176 assert(SizeSoFar == Layout->getSizeInBytes() &&
1177 "Layout of constant struct may be incorrect!");
1180 static void EmitGlobalConstantUnion(const ConstantUnion *CU,
1181 unsigned AddrSpace, AsmPrinter &AP) {
1182 const TargetData *TD = AP.TM.getTargetData();
1183 unsigned Size = TD->getTypeAllocSize(CU->getType());
1185 const Constant *Contents = CU->getOperand(0);
1186 unsigned FilledSize = TD->getTypeAllocSize(Contents->getType());
1188 // Print the actually filled part
1189 AP.EmitGlobalConstant(Contents, AddrSpace);
1191 // And pad with enough zeroes
1192 AP.OutStreamer.EmitZeros(Size-FilledSize, AddrSpace);
1195 static void EmitGlobalConstantFP(const ConstantFP *CFP, unsigned AddrSpace,
1197 // FP Constants are printed as integer constants to avoid losing
1199 if (CFP->getType()->isDoubleTy()) {
1200 if (AP.isVerbose()) {
1201 double Val = CFP->getValueAPF().convertToDouble();
1202 AP.OutStreamer.GetCommentOS() << "double " << Val << '\n';
1205 uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1206 AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace);
1210 if (CFP->getType()->isFloatTy()) {
1211 if (AP.isVerbose()) {
1212 float Val = CFP->getValueAPF().convertToFloat();
1213 AP.OutStreamer.GetCommentOS() << "float " << Val << '\n';
1215 uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1216 AP.OutStreamer.EmitIntValue(Val, 4, AddrSpace);
1220 if (CFP->getType()->isX86_FP80Ty()) {
1221 // all long double variants are printed as hex
1222 // api needed to prevent premature destruction
1223 APInt API = CFP->getValueAPF().bitcastToAPInt();
1224 const uint64_t *p = API.getRawData();
1225 if (AP.isVerbose()) {
1226 // Convert to double so we can print the approximate val as a comment.
1227 APFloat DoubleVal = CFP->getValueAPF();
1229 DoubleVal.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven,
1231 AP.OutStreamer.GetCommentOS() << "x86_fp80 ~= "
1232 << DoubleVal.convertToDouble() << '\n';
1235 if (AP.TM.getTargetData()->isBigEndian()) {
1236 AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace);
1237 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1239 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1240 AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace);
1243 // Emit the tail padding for the long double.
1244 const TargetData &TD = *AP.TM.getTargetData();
1245 AP.OutStreamer.EmitZeros(TD.getTypeAllocSize(CFP->getType()) -
1246 TD.getTypeStoreSize(CFP->getType()), AddrSpace);
1250 assert(CFP->getType()->isPPC_FP128Ty() &&
1251 "Floating point constant type not handled");
1252 // All long double variants are printed as hex api needed to prevent
1253 // premature destruction.
1254 APInt API = CFP->getValueAPF().bitcastToAPInt();
1255 const uint64_t *p = API.getRawData();
1256 if (AP.TM.getTargetData()->isBigEndian()) {
1257 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1258 AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace);
1260 AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace);
1261 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1265 static void EmitGlobalConstantLargeInt(const ConstantInt *CI,
1266 unsigned AddrSpace, AsmPrinter &AP) {
1267 const TargetData *TD = AP.TM.getTargetData();
1268 unsigned BitWidth = CI->getBitWidth();
1269 assert((BitWidth & 63) == 0 && "only support multiples of 64-bits");
1271 // We don't expect assemblers to support integer data directives
1272 // for more than 64 bits, so we emit the data in at most 64-bit
1273 // quantities at a time.
1274 const uint64_t *RawData = CI->getValue().getRawData();
1275 for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) {
1276 uint64_t Val = TD->isBigEndian() ? RawData[e - i - 1] : RawData[i];
1277 AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace);
1281 /// EmitGlobalConstant - Print a general LLVM constant to the .s file.
1282 void AsmPrinter::EmitGlobalConstant(const Constant *CV, unsigned AddrSpace) {
1283 if (isa<ConstantAggregateZero>(CV) || isa<UndefValue>(CV)) {
1284 uint64_t Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
1285 if (Size == 0) Size = 1; // An empty "_foo:" followed by a section is undef.
1286 return OutStreamer.EmitZeros(Size, AddrSpace);
1289 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
1290 unsigned Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
1297 OutStreamer.GetCommentOS() << format("0x%llx\n", CI->getZExtValue());
1298 OutStreamer.EmitIntValue(CI->getZExtValue(), Size, AddrSpace);
1301 EmitGlobalConstantLargeInt(CI, AddrSpace, *this);
1306 if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV))
1307 return EmitGlobalConstantArray(CVA, AddrSpace, *this);
1309 if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV))
1310 return EmitGlobalConstantStruct(CVS, AddrSpace, *this);
1312 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV))
1313 return EmitGlobalConstantFP(CFP, AddrSpace, *this);
1315 if (isa<ConstantPointerNull>(CV)) {
1316 unsigned Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
1317 OutStreamer.EmitIntValue(0, Size, AddrSpace);
1321 if (const ConstantUnion *CVU = dyn_cast<ConstantUnion>(CV))
1322 return EmitGlobalConstantUnion(CVU, AddrSpace, *this);
1324 if (const ConstantVector *V = dyn_cast<ConstantVector>(CV))
1325 return EmitGlobalConstantVector(V, AddrSpace, *this);
1327 // Otherwise, it must be a ConstantExpr. Lower it to an MCExpr, then emit it
1328 // thread the streamer with EmitValue.
1329 OutStreamer.EmitValue(LowerConstant(CV, *this),
1330 TM.getTargetData()->getTypeAllocSize(CV->getType()),
1334 void AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
1335 // Target doesn't support this yet!
1336 llvm_unreachable("Target does not support EmitMachineConstantPoolValue");
1339 void AsmPrinter::printOffset(int64_t Offset, raw_ostream &OS) const {
1341 OS << '+' << Offset;
1342 else if (Offset < 0)
1346 //===----------------------------------------------------------------------===//
1347 // Symbol Lowering Routines.
1348 //===----------------------------------------------------------------------===//
1350 /// GetTempSymbol - Return the MCSymbol corresponding to the assembler
1351 /// temporary label with the specified stem and unique ID.
1352 MCSymbol *AsmPrinter::GetTempSymbol(StringRef Name, unsigned ID) const {
1353 return OutContext.GetOrCreateSymbol(Twine(MAI->getPrivateGlobalPrefix()) +
1357 /// GetTempSymbol - Return an assembler temporary label with the specified
1359 MCSymbol *AsmPrinter::GetTempSymbol(StringRef Name) const {
1360 return OutContext.GetOrCreateSymbol(Twine(MAI->getPrivateGlobalPrefix())+
1365 MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BlockAddress *BA) const {
1366 return MMI->getAddrLabelSymbol(BA->getBasicBlock());
1369 MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BasicBlock *BB) const {
1370 return MMI->getAddrLabelSymbol(BB);
1373 /// GetCPISymbol - Return the symbol for the specified constant pool entry.
1374 MCSymbol *AsmPrinter::GetCPISymbol(unsigned CPID) const {
1375 return OutContext.GetOrCreateSymbol
1376 (Twine(MAI->getPrivateGlobalPrefix()) + "CPI" + Twine(getFunctionNumber())
1377 + "_" + Twine(CPID));
1380 /// GetJTISymbol - Return the symbol for the specified jump table entry.
1381 MCSymbol *AsmPrinter::GetJTISymbol(unsigned JTID, bool isLinkerPrivate) const {
1382 return MF->getJTISymbol(JTID, OutContext, isLinkerPrivate);
1385 /// GetJTSetSymbol - Return the symbol for the specified jump table .set
1386 /// FIXME: privatize to AsmPrinter.
1387 MCSymbol *AsmPrinter::GetJTSetSymbol(unsigned UID, unsigned MBBID) const {
1388 return OutContext.GetOrCreateSymbol
1389 (Twine(MAI->getPrivateGlobalPrefix()) + Twine(getFunctionNumber()) + "_" +
1390 Twine(UID) + "_set_" + Twine(MBBID));
1393 /// GetSymbolWithGlobalValueBase - Return the MCSymbol for a symbol with
1394 /// global value name as its base, with the specified suffix, and where the
1395 /// symbol is forced to have private linkage if ForcePrivate is true.
1396 MCSymbol *AsmPrinter::GetSymbolWithGlobalValueBase(const GlobalValue *GV,
1398 bool ForcePrivate) const {
1399 SmallString<60> NameStr;
1400 Mang->getNameWithPrefix(NameStr, GV, ForcePrivate);
1401 NameStr.append(Suffix.begin(), Suffix.end());
1402 return OutContext.GetOrCreateSymbol(NameStr.str());
1405 /// GetExternalSymbolSymbol - Return the MCSymbol for the specified
1407 MCSymbol *AsmPrinter::GetExternalSymbolSymbol(StringRef Sym) const {
1408 SmallString<60> NameStr;
1409 Mang->getNameWithPrefix(NameStr, Sym);
1410 return OutContext.GetOrCreateSymbol(NameStr.str());
1415 /// PrintParentLoopComment - Print comments about parent loops of this one.
1416 static void PrintParentLoopComment(raw_ostream &OS, const MachineLoop *Loop,
1417 unsigned FunctionNumber) {
1418 if (Loop == 0) return;
1419 PrintParentLoopComment(OS, Loop->getParentLoop(), FunctionNumber);
1420 OS.indent(Loop->getLoopDepth()*2)
1421 << "Parent Loop BB" << FunctionNumber << "_"
1422 << Loop->getHeader()->getNumber()
1423 << " Depth=" << Loop->getLoopDepth() << '\n';
1427 /// PrintChildLoopComment - Print comments about child loops within
1428 /// the loop for this basic block, with nesting.
1429 static void PrintChildLoopComment(raw_ostream &OS, const MachineLoop *Loop,
1430 unsigned FunctionNumber) {
1431 // Add child loop information
1432 for (MachineLoop::iterator CL = Loop->begin(), E = Loop->end();CL != E; ++CL){
1433 OS.indent((*CL)->getLoopDepth()*2)
1434 << "Child Loop BB" << FunctionNumber << "_"
1435 << (*CL)->getHeader()->getNumber() << " Depth " << (*CL)->getLoopDepth()
1437 PrintChildLoopComment(OS, *CL, FunctionNumber);
1441 /// EmitBasicBlockLoopComments - Pretty-print comments for basic blocks.
1442 static void EmitBasicBlockLoopComments(const MachineBasicBlock &MBB,
1443 const MachineLoopInfo *LI,
1444 const AsmPrinter &AP) {
1445 // Add loop depth information
1446 const MachineLoop *Loop = LI->getLoopFor(&MBB);
1447 if (Loop == 0) return;
1449 MachineBasicBlock *Header = Loop->getHeader();
1450 assert(Header && "No header for loop");
1452 // If this block is not a loop header, just print out what is the loop header
1454 if (Header != &MBB) {
1455 AP.OutStreamer.AddComment(" in Loop: Header=BB" +
1456 Twine(AP.getFunctionNumber())+"_" +
1457 Twine(Loop->getHeader()->getNumber())+
1458 " Depth="+Twine(Loop->getLoopDepth()));
1462 // Otherwise, it is a loop header. Print out information about child and
1464 raw_ostream &OS = AP.OutStreamer.GetCommentOS();
1466 PrintParentLoopComment(OS, Loop->getParentLoop(), AP.getFunctionNumber());
1469 OS.indent(Loop->getLoopDepth()*2-2);
1474 OS << "Loop Header: Depth=" + Twine(Loop->getLoopDepth()) << '\n';
1476 PrintChildLoopComment(OS, Loop, AP.getFunctionNumber());
1480 /// EmitBasicBlockStart - This method prints the label for the specified
1481 /// MachineBasicBlock, an alignment (if present) and a comment describing
1482 /// it if appropriate.
1483 void AsmPrinter::EmitBasicBlockStart(const MachineBasicBlock *MBB) const {
1484 // Emit an alignment directive for this block, if needed.
1485 if (unsigned Align = MBB->getAlignment())
1486 EmitAlignment(Log2_32(Align));
1488 // If the block has its address taken, emit any labels that were used to
1489 // reference the block. It is possible that there is more than one label
1490 // here, because multiple LLVM BB's may have been RAUW'd to this block after
1491 // the references were generated.
1492 if (MBB->hasAddressTaken()) {
1493 const BasicBlock *BB = MBB->getBasicBlock();
1495 OutStreamer.AddComment("Block address taken");
1497 std::vector<MCSymbol*> Syms = MMI->getAddrLabelSymbolToEmit(BB);
1499 for (unsigned i = 0, e = Syms.size(); i != e; ++i)
1500 OutStreamer.EmitLabel(Syms[i]);
1503 // Print the main label for the block.
1504 if (MBB->pred_empty() || isBlockOnlyReachableByFallthrough(MBB)) {
1505 if (isVerbose() && OutStreamer.hasRawTextSupport()) {
1506 if (const BasicBlock *BB = MBB->getBasicBlock())
1508 OutStreamer.AddComment("%" + BB->getName());
1510 EmitBasicBlockLoopComments(*MBB, LI, *this);
1512 // NOTE: Want this comment at start of line, don't emit with AddComment.
1513 OutStreamer.EmitRawText(Twine(MAI->getCommentString()) + " BB#" +
1514 Twine(MBB->getNumber()) + ":");
1518 if (const BasicBlock *BB = MBB->getBasicBlock())
1520 OutStreamer.AddComment("%" + BB->getName());
1521 EmitBasicBlockLoopComments(*MBB, LI, *this);
1524 OutStreamer.EmitLabel(MBB->getSymbol());
1528 void AsmPrinter::EmitVisibility(MCSymbol *Sym, unsigned Visibility) const {
1529 MCSymbolAttr Attr = MCSA_Invalid;
1531 switch (Visibility) {
1533 case GlobalValue::HiddenVisibility:
1534 Attr = MAI->getHiddenVisibilityAttr();
1536 case GlobalValue::ProtectedVisibility:
1537 Attr = MAI->getProtectedVisibilityAttr();
1541 if (Attr != MCSA_Invalid)
1542 OutStreamer.EmitSymbolAttribute(Sym, Attr);
1545 /// isBlockOnlyReachableByFallthough - Return true if the basic block has
1546 /// exactly one predecessor and the control transfer mechanism between
1547 /// the predecessor and this block is a fall-through.
1549 isBlockOnlyReachableByFallthrough(const MachineBasicBlock *MBB) const {
1550 // If this is a landing pad, it isn't a fall through. If it has no preds,
1551 // then nothing falls through to it.
1552 if (MBB->isLandingPad() || MBB->pred_empty())
1555 // If there isn't exactly one predecessor, it can't be a fall through.
1556 MachineBasicBlock::const_pred_iterator PI = MBB->pred_begin(), PI2 = PI;
1558 if (PI2 != MBB->pred_end())
1561 // The predecessor has to be immediately before this block.
1562 const MachineBasicBlock *Pred = *PI;
1564 if (!Pred->isLayoutSuccessor(MBB))
1567 // If the block is completely empty, then it definitely does fall through.
1571 // Otherwise, check the last instruction.
1572 const MachineInstr &LastInst = Pred->back();
1573 return !LastInst.getDesc().isBarrier();
1578 GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy *S) {
1579 if (!S->usesMetadata())
1582 gcp_map_type &GCMap = getGCMap(GCMetadataPrinters);
1583 gcp_map_type::iterator GCPI = GCMap.find(S);
1584 if (GCPI != GCMap.end())
1585 return GCPI->second;
1587 const char *Name = S->getName().c_str();
1589 for (GCMetadataPrinterRegistry::iterator
1590 I = GCMetadataPrinterRegistry::begin(),
1591 E = GCMetadataPrinterRegistry::end(); I != E; ++I)
1592 if (strcmp(Name, I->getName()) == 0) {
1593 GCMetadataPrinter *GMP = I->instantiate();
1595 GCMap.insert(std::make_pair(S, GMP));
1599 llvm_report_error("no GCMetadataPrinter registered for GC: " + Twine(Name));