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/Assembly/Writer.h"
17 #include "llvm/DerivedTypes.h"
18 #include "llvm/Constants.h"
19 #include "llvm/Module.h"
20 #include "llvm/CodeGen/DwarfWriter.h"
21 #include "llvm/CodeGen/GCMetadataPrinter.h"
22 #include "llvm/CodeGen/MachineConstantPool.h"
23 #include "llvm/CodeGen/MachineFrameInfo.h"
24 #include "llvm/CodeGen/MachineFunction.h"
25 #include "llvm/CodeGen/MachineJumpTableInfo.h"
26 #include "llvm/CodeGen/MachineLoopInfo.h"
27 #include "llvm/CodeGen/MachineModuleInfo.h"
28 #include "llvm/Analysis/ConstantFolding.h"
29 #include "llvm/Analysis/DebugInfo.h"
30 #include "llvm/MC/MCContext.h"
31 #include "llvm/MC/MCExpr.h"
32 #include "llvm/MC/MCInst.h"
33 #include "llvm/MC/MCSection.h"
34 #include "llvm/MC/MCStreamer.h"
35 #include "llvm/MC/MCSymbol.h"
36 #include "llvm/MC/MCAsmInfo.h"
37 #include "llvm/Target/Mangler.h"
38 #include "llvm/Target/TargetData.h"
39 #include "llvm/Target/TargetInstrInfo.h"
40 #include "llvm/Target/TargetLowering.h"
41 #include "llvm/Target/TargetLoweringObjectFile.h"
42 #include "llvm/Target/TargetOptions.h"
43 #include "llvm/Target/TargetRegisterInfo.h"
44 #include "llvm/ADT/SmallPtrSet.h"
45 #include "llvm/ADT/SmallString.h"
46 #include "llvm/ADT/Statistic.h"
47 #include "llvm/Support/CommandLine.h"
48 #include "llvm/Support/Debug.h"
49 #include "llvm/Support/ErrorHandling.h"
50 #include "llvm/Support/Format.h"
51 #include "llvm/Support/FormattedStream.h"
55 STATISTIC(EmittedInsts, "Number of machine instrs printed");
57 char AsmPrinter::ID = 0;
59 AsmPrinter::AsmPrinter(formatted_raw_ostream &o, TargetMachine &tm,
61 : MachineFunctionPass(&ID), O(o),
62 TM(tm), MAI(tm.getMCAsmInfo()), TRI(tm.getRegisterInfo()),
63 OutContext(Streamer.getContext()),
64 OutStreamer(Streamer),
65 LastMI(0), LastFn(0), Counter(~0U), SetCounter(0) {
67 VerboseAsm = Streamer.isVerboseAsm();
70 AsmPrinter::~AsmPrinter() {
71 for (gcp_iterator I = GCMetadataPrinters.begin(),
72 E = GCMetadataPrinters.end(); I != E; ++I)
78 /// getFunctionNumber - Return a unique ID for the current function.
80 unsigned AsmPrinter::getFunctionNumber() const {
81 return MF->getFunctionNumber();
84 TargetLoweringObjectFile &AsmPrinter::getObjFileLowering() const {
85 return TM.getTargetLowering()->getObjFileLowering();
88 /// getCurrentSection() - Return the current section we are emitting to.
89 const MCSection *AsmPrinter::getCurrentSection() const {
90 return OutStreamer.getCurrentSection();
94 void AsmPrinter::getAnalysisUsage(AnalysisUsage &AU) const {
96 MachineFunctionPass::getAnalysisUsage(AU);
97 AU.addRequired<MachineModuleInfo>();
98 AU.addRequired<GCModuleInfo>();
100 AU.addRequired<MachineLoopInfo>();
103 bool AsmPrinter::doInitialization(Module &M) {
104 MMI = getAnalysisIfAvailable<MachineModuleInfo>();
105 MMI->AnalyzeModule(M);
107 // Initialize TargetLoweringObjectFile.
108 const_cast<TargetLoweringObjectFile&>(getObjFileLowering())
109 .Initialize(OutContext, TM);
111 Mang = new Mangler(OutContext, *TM.getTargetData());
113 // Allow the target to emit any magic that it wants at the start of the file.
114 EmitStartOfAsmFile(M);
116 // Very minimal debug info. It is ignored if we emit actual debug info. If we
117 // don't, this at least helps the user find where a global came from.
118 if (MAI->hasSingleParameterDotFile()) {
120 OutStreamer.EmitFileDirective(M.getModuleIdentifier());
123 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
124 assert(MI && "AsmPrinter didn't require GCModuleInfo?");
125 for (GCModuleInfo::iterator I = MI->begin(), E = MI->end(); I != E; ++I)
126 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I))
127 MP->beginAssembly(O, *this, *MAI);
129 if (!M.getModuleInlineAsm().empty()) {
130 OutStreamer.AddComment("Start of file scope inline assembly");
131 OutStreamer.AddBlankLine();
132 O << M.getModuleInlineAsm();
134 if (*M.getModuleInlineAsm().rbegin() != '\n')
135 OutStreamer.AddBlankLine();
136 OutStreamer.AddComment("End of file scope inline assembly");
137 OutStreamer.AddBlankLine();
140 DW = getAnalysisIfAvailable<DwarfWriter>();
142 DW->BeginModule(&M, MMI, O, this, MAI);
147 void AsmPrinter::EmitLinkage(unsigned Linkage, MCSymbol *GVSym) const {
148 switch ((GlobalValue::LinkageTypes)Linkage) {
149 case GlobalValue::CommonLinkage:
150 case GlobalValue::LinkOnceAnyLinkage:
151 case GlobalValue::LinkOnceODRLinkage:
152 case GlobalValue::WeakAnyLinkage:
153 case GlobalValue::WeakODRLinkage:
154 case GlobalValue::LinkerPrivateLinkage:
155 if (MAI->getWeakDefDirective() != 0) {
157 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
158 // .weak_definition _foo
159 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_WeakDefinition);
160 } else if (const char *LinkOnce = MAI->getLinkOnceDirective()) {
162 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
163 // FIXME: linkonce should be a section attribute, handled by COFF Section
165 // http://sourceware.org/binutils/docs-2.20/as/Linkonce.html#Linkonce
167 // FIXME: It would be nice to use .linkonce samesize for non-common
172 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Weak);
175 case GlobalValue::DLLExportLinkage:
176 case GlobalValue::AppendingLinkage:
177 // FIXME: appending linkage variables should go into a section of
178 // their name or something. For now, just emit them as external.
179 case GlobalValue::ExternalLinkage:
180 // If external or appending, declare as a global symbol.
182 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
184 case GlobalValue::PrivateLinkage:
185 case GlobalValue::InternalLinkage:
188 llvm_unreachable("Unknown linkage type!");
193 /// EmitGlobalVariable - Emit the specified global variable to the .s file.
194 void AsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) {
195 if (!GV->hasInitializer()) // External globals require no code.
198 // Check to see if this is a special global used by LLVM, if so, emit it.
199 if (EmitSpecialLLVMGlobal(GV))
202 MCSymbol *GVSym = Mang->getSymbol(GV);
203 EmitVisibility(GVSym, GV->getVisibility());
205 if (MAI->hasDotTypeDotSizeDirective())
206 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_ELF_TypeObject);
208 SectionKind GVKind = TargetLoweringObjectFile::getKindForGlobal(GV, TM);
210 const TargetData *TD = TM.getTargetData();
211 unsigned Size = TD->getTypeAllocSize(GV->getType()->getElementType());
212 unsigned AlignLog = TD->getPreferredAlignmentLog(GV);
214 // Handle common and BSS local symbols (.lcomm).
215 if (GVKind.isCommon() || GVKind.isBSSLocal()) {
216 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
219 WriteAsOperand(OutStreamer.GetCommentOS(), GV,
220 /*PrintType=*/false, GV->getParent());
221 OutStreamer.GetCommentOS() << '\n';
224 // Handle common symbols.
225 if (GVKind.isCommon()) {
227 OutStreamer.EmitCommonSymbol(GVSym, Size, 1 << AlignLog);
231 // Handle local BSS symbols.
232 if (MAI->hasMachoZeroFillDirective()) {
233 const MCSection *TheSection =
234 getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM);
235 // .zerofill __DATA, __bss, _foo, 400, 5
236 OutStreamer.EmitZerofill(TheSection, GVSym, Size, 1 << AlignLog);
240 if (MAI->hasLCOMMDirective()) {
242 OutStreamer.EmitLocalCommonSymbol(GVSym, Size);
247 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Local);
249 OutStreamer.EmitCommonSymbol(GVSym, Size, 1 << AlignLog);
253 const MCSection *TheSection =
254 getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM);
256 // Handle the zerofill directive on darwin, which is a special form of BSS
258 if (GVKind.isBSSExtern() && MAI->hasMachoZeroFillDirective()) {
260 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
261 // .zerofill __DATA, __common, _foo, 400, 5
262 OutStreamer.EmitZerofill(TheSection, GVSym, Size, 1 << AlignLog);
266 OutStreamer.SwitchSection(TheSection);
268 EmitLinkage(GV->getLinkage(), GVSym);
269 EmitAlignment(AlignLog, GV);
272 WriteAsOperand(OutStreamer.GetCommentOS(), GV,
273 /*PrintType=*/false, GV->getParent());
274 OutStreamer.GetCommentOS() << '\n';
276 OutStreamer.EmitLabel(GVSym);
278 EmitGlobalConstant(GV->getInitializer());
280 if (MAI->hasDotTypeDotSizeDirective())
282 OutStreamer.EmitELFSize(GVSym, MCConstantExpr::Create(Size, OutContext));
284 OutStreamer.AddBlankLine();
287 /// EmitFunctionHeader - This method emits the header for the current
289 void AsmPrinter::EmitFunctionHeader() {
290 // Print out constants referenced by the function
293 // Print the 'header' of function.
294 const Function *F = MF->getFunction();
296 OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang, TM));
297 EmitVisibility(CurrentFnSym, F->getVisibility());
299 EmitLinkage(F->getLinkage(), CurrentFnSym);
300 EmitAlignment(MF->getAlignment(), F);
302 if (MAI->hasDotTypeDotSizeDirective())
303 OutStreamer.EmitSymbolAttribute(CurrentFnSym, MCSA_ELF_TypeFunction);
306 WriteAsOperand(OutStreamer.GetCommentOS(), F,
307 /*PrintType=*/false, F->getParent());
308 OutStreamer.GetCommentOS() << '\n';
311 // Emit the CurrentFnSym. This is a virtual function to allow targets to
312 // do their wild and crazy things as required.
313 EmitFunctionEntryLabel();
315 // If the function had address-taken blocks that got deleted, then we have
316 // references to the dangling symbols. Emit them at the start of the function
317 // so that we don't get references to undefined symbols.
318 std::vector<MCSymbol*> DeadBlockSyms;
319 MMI->takeDeletedSymbolsForFunction(F, DeadBlockSyms);
320 for (unsigned i = 0, e = DeadBlockSyms.size(); i != e; ++i) {
321 OutStreamer.AddComment("Address taken block that was later removed");
322 OutStreamer.EmitLabel(DeadBlockSyms[i]);
325 // Add some workaround for linkonce linkage on Cygwin\MinGW.
326 if (MAI->getLinkOnceDirective() != 0 &&
327 (F->hasLinkOnceLinkage() || F->hasWeakLinkage()))
328 // FIXME: What is this?
329 O << "Lllvm$workaround$fake$stub$" << *CurrentFnSym << ":\n";
331 // Emit pre-function debug and/or EH information.
332 if (MAI->doesSupportDebugInformation() || MAI->doesSupportExceptionHandling())
333 DW->BeginFunction(MF);
336 /// EmitFunctionEntryLabel - Emit the label that is the entrypoint for the
337 /// function. This can be overridden by targets as required to do custom stuff.
338 void AsmPrinter::EmitFunctionEntryLabel() {
339 OutStreamer.EmitLabel(CurrentFnSym);
343 /// EmitComments - Pretty-print comments for instructions.
344 static void EmitComments(const MachineInstr &MI, raw_ostream &CommentOS) {
345 const MachineFunction *MF = MI.getParent()->getParent();
346 const TargetMachine &TM = MF->getTarget();
348 DebugLoc DL = MI.getDebugLoc();
349 if (!DL.isUnknown()) { // Print source line info.
350 DIScope Scope(DL.getScope(MF->getFunction()->getContext()));
351 // Omit the directory, because it's likely to be long and uninteresting.
353 CommentOS << Scope.getFilename();
355 CommentOS << "<unknown>";
356 CommentOS << ':' << DL.getLine();
357 if (DL.getCol() != 0)
358 CommentOS << ':' << DL.getCol();
362 // Check for spills and reloads
365 const MachineFrameInfo *FrameInfo = MF->getFrameInfo();
367 // We assume a single instruction only has a spill or reload, not
369 const MachineMemOperand *MMO;
370 if (TM.getInstrInfo()->isLoadFromStackSlotPostFE(&MI, FI)) {
371 if (FrameInfo->isSpillSlotObjectIndex(FI)) {
372 MMO = *MI.memoperands_begin();
373 CommentOS << MMO->getSize() << "-byte Reload\n";
375 } else if (TM.getInstrInfo()->hasLoadFromStackSlot(&MI, MMO, FI)) {
376 if (FrameInfo->isSpillSlotObjectIndex(FI))
377 CommentOS << MMO->getSize() << "-byte Folded Reload\n";
378 } else if (TM.getInstrInfo()->isStoreToStackSlotPostFE(&MI, FI)) {
379 if (FrameInfo->isSpillSlotObjectIndex(FI)) {
380 MMO = *MI.memoperands_begin();
381 CommentOS << MMO->getSize() << "-byte Spill\n";
383 } else if (TM.getInstrInfo()->hasStoreToStackSlot(&MI, MMO, FI)) {
384 if (FrameInfo->isSpillSlotObjectIndex(FI))
385 CommentOS << MMO->getSize() << "-byte Folded Spill\n";
388 // Check for spill-induced copies
389 unsigned SrcReg, DstReg, SrcSubIdx, DstSubIdx;
390 if (TM.getInstrInfo()->isMoveInstr(MI, SrcReg, DstReg,
391 SrcSubIdx, DstSubIdx)) {
392 if (MI.getAsmPrinterFlag(MachineInstr::ReloadReuse))
393 CommentOS << " Reload Reuse\n";
399 /// EmitFunctionBody - This method emits the body and trailer for a
401 void AsmPrinter::EmitFunctionBody() {
402 // Emit target-specific gunk before the function body.
403 EmitFunctionBodyStart();
405 // Print out code for the function.
406 bool HasAnyRealCode = false;
407 for (MachineFunction::const_iterator I = MF->begin(), E = MF->end();
409 // Print a label for the basic block.
410 EmitBasicBlockStart(I);
411 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
413 // Print the assembly for the instruction.
415 HasAnyRealCode = true;
419 // FIXME: Clean up processDebugLoc.
420 processDebugLoc(II, true);
423 EmitComments(*II, OutStreamer.GetCommentOS());
425 switch (II->getOpcode()) {
426 case TargetOpcode::DBG_LABEL:
427 case TargetOpcode::EH_LABEL:
428 case TargetOpcode::GC_LABEL:
431 case TargetOpcode::INLINEASM:
434 case TargetOpcode::IMPLICIT_DEF:
435 printImplicitDef(II);
437 case TargetOpcode::KILL:
445 // FIXME: Clean up processDebugLoc.
446 processDebugLoc(II, false);
450 // If the function is empty and the object file uses .subsections_via_symbols,
451 // then we need to emit *something* to the function body to prevent the
452 // labels from collapsing together. Just emit a 0 byte.
453 if (MAI->hasSubsectionsViaSymbols() && !HasAnyRealCode)
454 OutStreamer.EmitIntValue(0, 1, 0/*addrspace*/);
456 // Emit target-specific gunk after the function body.
457 EmitFunctionBodyEnd();
459 if (MAI->hasDotTypeDotSizeDirective())
460 O << "\t.size\t" << *CurrentFnSym << ", .-" << *CurrentFnSym << '\n';
462 // Emit post-function debug information.
463 if (MAI->doesSupportDebugInformation() || MAI->doesSupportExceptionHandling())
466 // Print out jump tables referenced by the function.
469 OutStreamer.AddBlankLine();
473 bool AsmPrinter::doFinalization(Module &M) {
474 // Emit global variables.
475 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
477 EmitGlobalVariable(I);
479 // Emit final debug information.
480 if (MAI->doesSupportDebugInformation() || MAI->doesSupportExceptionHandling())
483 // If the target wants to know about weak references, print them all.
484 if (MAI->getWeakRefDirective()) {
485 // FIXME: This is not lazy, it would be nice to only print weak references
486 // to stuff that is actually used. Note that doing so would require targets
487 // to notice uses in operands (due to constant exprs etc). This should
488 // happen with the MC stuff eventually.
490 // Print out module-level global variables here.
491 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
493 if (!I->hasExternalWeakLinkage()) continue;
494 OutStreamer.EmitSymbolAttribute(Mang->getSymbol(I), MCSA_WeakReference);
497 for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I) {
498 if (!I->hasExternalWeakLinkage()) continue;
499 OutStreamer.EmitSymbolAttribute(Mang->getSymbol(I), MCSA_WeakReference);
503 if (MAI->hasSetDirective()) {
504 OutStreamer.AddBlankLine();
505 for (Module::const_alias_iterator I = M.alias_begin(), E = M.alias_end();
507 MCSymbol *Name = Mang->getSymbol(I);
509 const GlobalValue *GV = cast<GlobalValue>(I->getAliasedGlobal());
510 MCSymbol *Target = Mang->getSymbol(GV);
512 if (I->hasExternalLinkage() || !MAI->getWeakRefDirective())
513 OutStreamer.EmitSymbolAttribute(Name, MCSA_Global);
514 else if (I->hasWeakLinkage())
515 OutStreamer.EmitSymbolAttribute(Name, MCSA_WeakReference);
517 assert(I->hasLocalLinkage() && "Invalid alias linkage");
519 EmitVisibility(Name, I->getVisibility());
521 // Emit the directives as assignments aka .set:
522 OutStreamer.EmitAssignment(Name,
523 MCSymbolRefExpr::Create(Target, OutContext));
527 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
528 assert(MI && "AsmPrinter didn't require GCModuleInfo?");
529 for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; )
530 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*--I))
531 MP->finishAssembly(O, *this, *MAI);
533 // If we don't have any trampolines, then we don't require stack memory
534 // to be executable. Some targets have a directive to declare this.
535 Function *InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline");
536 if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty())
537 if (MCSection *S = MAI->getNonexecutableStackSection(OutContext))
538 OutStreamer.SwitchSection(S);
540 // Allow the target to emit any magic that it wants at the end of the file,
541 // after everything else has gone out.
544 delete Mang; Mang = 0;
547 OutStreamer.Finish();
551 void AsmPrinter::SetupMachineFunction(MachineFunction &MF) {
553 // Get the function symbol.
554 CurrentFnSym = Mang->getSymbol(MF.getFunction());
557 LI = &getAnalysis<MachineLoopInfo>();
561 // SectionCPs - Keep track the alignment, constpool entries per Section.
565 SmallVector<unsigned, 4> CPEs;
566 SectionCPs(const MCSection *s, unsigned a) : S(s), Alignment(a) {}
570 /// EmitConstantPool - Print to the current output stream assembly
571 /// representations of the constants in the constant pool MCP. This is
572 /// used to print out constants which have been "spilled to memory" by
573 /// the code generator.
575 void AsmPrinter::EmitConstantPool() {
576 const MachineConstantPool *MCP = MF->getConstantPool();
577 const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
578 if (CP.empty()) return;
580 // Calculate sections for constant pool entries. We collect entries to go into
581 // the same section together to reduce amount of section switch statements.
582 SmallVector<SectionCPs, 4> CPSections;
583 for (unsigned i = 0, e = CP.size(); i != e; ++i) {
584 const MachineConstantPoolEntry &CPE = CP[i];
585 unsigned Align = CPE.getAlignment();
588 switch (CPE.getRelocationInfo()) {
589 default: llvm_unreachable("Unknown section kind");
590 case 2: Kind = SectionKind::getReadOnlyWithRel(); break;
592 Kind = SectionKind::getReadOnlyWithRelLocal();
595 switch (TM.getTargetData()->getTypeAllocSize(CPE.getType())) {
596 case 4: Kind = SectionKind::getMergeableConst4(); break;
597 case 8: Kind = SectionKind::getMergeableConst8(); break;
598 case 16: Kind = SectionKind::getMergeableConst16();break;
599 default: Kind = SectionKind::getMergeableConst(); break;
603 const MCSection *S = getObjFileLowering().getSectionForConstant(Kind);
605 // The number of sections are small, just do a linear search from the
606 // last section to the first.
608 unsigned SecIdx = CPSections.size();
609 while (SecIdx != 0) {
610 if (CPSections[--SecIdx].S == S) {
616 SecIdx = CPSections.size();
617 CPSections.push_back(SectionCPs(S, Align));
620 if (Align > CPSections[SecIdx].Alignment)
621 CPSections[SecIdx].Alignment = Align;
622 CPSections[SecIdx].CPEs.push_back(i);
625 // Now print stuff into the calculated sections.
626 for (unsigned i = 0, e = CPSections.size(); i != e; ++i) {
627 OutStreamer.SwitchSection(CPSections[i].S);
628 EmitAlignment(Log2_32(CPSections[i].Alignment));
631 for (unsigned j = 0, ee = CPSections[i].CPEs.size(); j != ee; ++j) {
632 unsigned CPI = CPSections[i].CPEs[j];
633 MachineConstantPoolEntry CPE = CP[CPI];
635 // Emit inter-object padding for alignment.
636 unsigned AlignMask = CPE.getAlignment() - 1;
637 unsigned NewOffset = (Offset + AlignMask) & ~AlignMask;
638 OutStreamer.EmitFill(NewOffset - Offset, 0/*fillval*/, 0/*addrspace*/);
640 const Type *Ty = CPE.getType();
641 Offset = NewOffset + TM.getTargetData()->getTypeAllocSize(Ty);
643 // Emit the label with a comment on it.
645 OutStreamer.GetCommentOS() << "constant pool ";
646 WriteTypeSymbolic(OutStreamer.GetCommentOS(), CPE.getType(),
647 MF->getFunction()->getParent());
648 OutStreamer.GetCommentOS() << '\n';
650 OutStreamer.EmitLabel(GetCPISymbol(CPI));
652 if (CPE.isMachineConstantPoolEntry())
653 EmitMachineConstantPoolValue(CPE.Val.MachineCPVal);
655 EmitGlobalConstant(CPE.Val.ConstVal);
660 /// EmitJumpTableInfo - Print assembly representations of the jump tables used
661 /// by the current function to the current output stream.
663 void AsmPrinter::EmitJumpTableInfo() {
664 const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo();
665 if (MJTI == 0) return;
666 if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_Inline) return;
667 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
668 if (JT.empty()) return;
670 // Pick the directive to use to print the jump table entries, and switch to
671 // the appropriate section.
672 const Function *F = MF->getFunction();
673 bool JTInDiffSection = false;
674 if (// In PIC mode, we need to emit the jump table to the same section as the
675 // function body itself, otherwise the label differences won't make sense.
676 // FIXME: Need a better predicate for this: what about custom entries?
677 MJTI->getEntryKind() == MachineJumpTableInfo::EK_LabelDifference32 ||
678 // We should also do if the section name is NULL or function is declared
679 // in discardable section
680 // FIXME: this isn't the right predicate, should be based on the MCSection
682 F->isWeakForLinker()) {
683 OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F,Mang,TM));
685 // Otherwise, drop it in the readonly section.
686 const MCSection *ReadOnlySection =
687 getObjFileLowering().getSectionForConstant(SectionKind::getReadOnly());
688 OutStreamer.SwitchSection(ReadOnlySection);
689 JTInDiffSection = true;
692 EmitAlignment(Log2_32(MJTI->getEntryAlignment(*TM.getTargetData())));
694 for (unsigned JTI = 0, e = JT.size(); JTI != e; ++JTI) {
695 const std::vector<MachineBasicBlock*> &JTBBs = JT[JTI].MBBs;
697 // If this jump table was deleted, ignore it.
698 if (JTBBs.empty()) continue;
700 // For the EK_LabelDifference32 entry, if the target supports .set, emit a
701 // .set directive for each unique entry. This reduces the number of
702 // relocations the assembler will generate for the jump table.
703 if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_LabelDifference32 &&
704 MAI->hasSetDirective()) {
705 SmallPtrSet<const MachineBasicBlock*, 16> EmittedSets;
706 const TargetLowering *TLI = TM.getTargetLowering();
707 const MCExpr *Base = TLI->getPICJumpTableRelocBaseExpr(MF,JTI,OutContext);
708 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
709 const MachineBasicBlock *MBB = JTBBs[ii];
710 if (!EmittedSets.insert(MBB)) continue;
712 // .set LJTSet, LBB32-base
714 MCSymbolRefExpr::Create(MBB->getSymbol(), OutContext);
715 OutStreamer.EmitAssignment(GetJTSetSymbol(JTI, MBB->getNumber()),
716 MCBinaryExpr::CreateSub(LHS, Base, OutContext));
720 // On some targets (e.g. Darwin) we want to emit two consequtive labels
721 // before each jump table. The first label is never referenced, but tells
722 // the assembler and linker the extents of the jump table object. The
723 // second label is actually referenced by the code.
724 if (JTInDiffSection && MAI->getLinkerPrivateGlobalPrefix()[0])
725 // FIXME: This doesn't have to have any specific name, just any randomly
726 // named and numbered 'l' label would work. Simplify GetJTISymbol.
727 OutStreamer.EmitLabel(GetJTISymbol(JTI, true));
729 OutStreamer.EmitLabel(GetJTISymbol(JTI));
731 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
732 EmitJumpTableEntry(MJTI, JTBBs[ii], JTI);
736 /// EmitJumpTableEntry - Emit a jump table entry for the specified MBB to the
738 void AsmPrinter::EmitJumpTableEntry(const MachineJumpTableInfo *MJTI,
739 const MachineBasicBlock *MBB,
740 unsigned UID) const {
741 const MCExpr *Value = 0;
742 switch (MJTI->getEntryKind()) {
743 case MachineJumpTableInfo::EK_Inline:
744 llvm_unreachable("Cannot emit EK_Inline jump table entry"); break;
745 case MachineJumpTableInfo::EK_Custom32:
746 Value = TM.getTargetLowering()->LowerCustomJumpTableEntry(MJTI, MBB, UID,
749 case MachineJumpTableInfo::EK_BlockAddress:
750 // EK_BlockAddress - Each entry is a plain address of block, e.g.:
752 Value = MCSymbolRefExpr::Create(MBB->getSymbol(), OutContext);
754 case MachineJumpTableInfo::EK_GPRel32BlockAddress: {
755 // EK_GPRel32BlockAddress - Each entry is an address of block, encoded
756 // with a relocation as gp-relative, e.g.:
758 MCSymbol *MBBSym = MBB->getSymbol();
759 OutStreamer.EmitGPRel32Value(MCSymbolRefExpr::Create(MBBSym, OutContext));
763 case MachineJumpTableInfo::EK_LabelDifference32: {
764 // EK_LabelDifference32 - Each entry is the address of the block minus
765 // the address of the jump table. This is used for PIC jump tables where
766 // gprel32 is not supported. e.g.:
767 // .word LBB123 - LJTI1_2
768 // If the .set directive is supported, this is emitted as:
769 // .set L4_5_set_123, LBB123 - LJTI1_2
770 // .word L4_5_set_123
772 // If we have emitted set directives for the jump table entries, print
773 // them rather than the entries themselves. If we're emitting PIC, then
774 // emit the table entries as differences between two text section labels.
775 if (MAI->hasSetDirective()) {
776 // If we used .set, reference the .set's symbol.
777 Value = MCSymbolRefExpr::Create(GetJTSetSymbol(UID, MBB->getNumber()),
781 // Otherwise, use the difference as the jump table entry.
782 Value = MCSymbolRefExpr::Create(MBB->getSymbol(), OutContext);
783 const MCExpr *JTI = MCSymbolRefExpr::Create(GetJTISymbol(UID), OutContext);
784 Value = MCBinaryExpr::CreateSub(Value, JTI, OutContext);
789 assert(Value && "Unknown entry kind!");
791 unsigned EntrySize = MJTI->getEntrySize(*TM.getTargetData());
792 OutStreamer.EmitValue(Value, EntrySize, /*addrspace*/0);
796 /// EmitSpecialLLVMGlobal - Check to see if the specified global is a
797 /// special global used by LLVM. If so, emit it and return true, otherwise
798 /// do nothing and return false.
799 bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
800 if (GV->getName() == "llvm.used") {
801 if (MAI->hasNoDeadStrip()) // No need to emit this at all.
802 EmitLLVMUsedList(GV->getInitializer());
806 // Ignore debug and non-emitted data. This handles llvm.compiler.used.
807 if (GV->getSection() == "llvm.metadata" ||
808 GV->hasAvailableExternallyLinkage())
811 if (!GV->hasAppendingLinkage()) return false;
813 assert(GV->hasInitializer() && "Not a special LLVM global!");
815 const TargetData *TD = TM.getTargetData();
816 unsigned Align = Log2_32(TD->getPointerPrefAlignment());
817 if (GV->getName() == "llvm.global_ctors") {
818 OutStreamer.SwitchSection(getObjFileLowering().getStaticCtorSection());
819 EmitAlignment(Align, 0);
820 EmitXXStructorList(GV->getInitializer());
822 if (TM.getRelocationModel() == Reloc::Static &&
823 MAI->hasStaticCtorDtorReferenceInStaticMode()) {
824 StringRef Sym(".constructors_used");
825 OutStreamer.EmitSymbolAttribute(OutContext.GetOrCreateSymbol(Sym),
831 if (GV->getName() == "llvm.global_dtors") {
832 OutStreamer.SwitchSection(getObjFileLowering().getStaticDtorSection());
833 EmitAlignment(Align, 0);
834 EmitXXStructorList(GV->getInitializer());
836 if (TM.getRelocationModel() == Reloc::Static &&
837 MAI->hasStaticCtorDtorReferenceInStaticMode()) {
838 StringRef Sym(".destructors_used");
839 OutStreamer.EmitSymbolAttribute(OutContext.GetOrCreateSymbol(Sym),
848 /// EmitLLVMUsedList - For targets that define a MAI::UsedDirective, mark each
849 /// global in the specified llvm.used list for which emitUsedDirectiveFor
850 /// is true, as being used with this directive.
851 void AsmPrinter::EmitLLVMUsedList(Constant *List) {
852 // Should be an array of 'i8*'.
853 ConstantArray *InitList = dyn_cast<ConstantArray>(List);
854 if (InitList == 0) return;
856 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
857 const GlobalValue *GV =
858 dyn_cast<GlobalValue>(InitList->getOperand(i)->stripPointerCasts());
859 if (GV && getObjFileLowering().shouldEmitUsedDirectiveFor(GV, Mang))
860 OutStreamer.EmitSymbolAttribute(Mang->getSymbol(GV), MCSA_NoDeadStrip);
864 /// EmitXXStructorList - Emit the ctor or dtor list. This just prints out the
865 /// function pointers, ignoring the init priority.
866 void AsmPrinter::EmitXXStructorList(Constant *List) {
867 // Should be an array of '{ int, void ()* }' structs. The first value is the
868 // init priority, which we ignore.
869 if (!isa<ConstantArray>(List)) return;
870 ConstantArray *InitList = cast<ConstantArray>(List);
871 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
872 if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
873 if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
875 if (CS->getOperand(1)->isNullValue())
876 return; // Found a null terminator, exit printing.
877 // Emit the function pointer.
878 EmitGlobalConstant(CS->getOperand(1));
882 //===--------------------------------------------------------------------===//
883 // Emission and print routines
886 /// EmitInt8 - Emit a byte directive and value.
888 void AsmPrinter::EmitInt8(int Value) const {
889 OutStreamer.EmitIntValue(Value, 1, 0/*addrspace*/);
892 /// EmitInt16 - Emit a short directive and value.
894 void AsmPrinter::EmitInt16(int Value) const {
895 OutStreamer.EmitIntValue(Value, 2, 0/*addrspace*/);
898 /// EmitInt32 - Emit a long directive and value.
900 void AsmPrinter::EmitInt32(int Value) const {
901 OutStreamer.EmitIntValue(Value, 4, 0/*addrspace*/);
904 /// EmitInt64 - Emit a long long directive and value.
906 void AsmPrinter::EmitInt64(uint64_t Value) const {
907 OutStreamer.EmitIntValue(Value, 8, 0/*addrspace*/);
910 /// EmitLabelDifference - Emit something like ".long Hi-Lo" where the size
911 /// in bytes of the directive is specified by Size and Hi/Lo specify the
912 /// labels. This implicitly uses .set if it is available.
913 void AsmPrinter::EmitLabelDifference(const MCSymbol *Hi, const MCSymbol *Lo,
914 unsigned Size) const {
915 // Get the Hi-Lo expression.
917 MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(Hi, OutContext),
918 MCSymbolRefExpr::Create(Lo, OutContext),
921 if (!MAI->hasSetDirective()) {
922 OutStreamer.EmitValue(Diff, Size, 0/*AddrSpace*/);
926 // Otherwise, emit with .set (aka assignment).
928 OutContext.GetOrCreateSymbol(Twine(MAI->getPrivateGlobalPrefix()) +
929 "set" + Twine(SetCounter++));
930 OutStreamer.EmitAssignment(SetLabel, Diff);
931 OutStreamer.EmitSymbolValue(SetLabel, Size, 0/*AddrSpace*/);
935 //===----------------------------------------------------------------------===//
937 // EmitAlignment - Emit an alignment directive to the specified power of
938 // two boundary. For example, if you pass in 3 here, you will get an 8
939 // byte alignment. If a global value is specified, and if that global has
940 // an explicit alignment requested, it will unconditionally override the
941 // alignment request. However, if ForcedAlignBits is specified, this value
942 // has final say: the ultimate alignment will be the max of ForcedAlignBits
943 // and the alignment computed with NumBits and the global.
947 // if (GV && GV->hasalignment) Align = GV->getalignment();
948 // Align = std::max(Align, ForcedAlignBits);
950 void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV,
951 unsigned ForcedAlignBits,
952 bool UseFillExpr) const {
953 if (GV && GV->getAlignment())
954 NumBits = Log2_32(GV->getAlignment());
955 NumBits = std::max(NumBits, ForcedAlignBits);
957 if (NumBits == 0) return; // No need to emit alignment.
959 if (getCurrentSection()->getKind().isText())
960 OutStreamer.EmitCodeAlignment(1 << NumBits);
962 OutStreamer.EmitValueToAlignment(1 << NumBits, 0, 1, 0);
965 /// LowerConstant - Lower the specified LLVM Constant to an MCExpr.
967 static const MCExpr *LowerConstant(const Constant *CV, AsmPrinter &AP) {
968 MCContext &Ctx = AP.OutContext;
970 if (CV->isNullValue() || isa<UndefValue>(CV))
971 return MCConstantExpr::Create(0, Ctx);
973 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV))
974 return MCConstantExpr::Create(CI->getZExtValue(), Ctx);
976 if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV))
977 return MCSymbolRefExpr::Create(AP.Mang->getSymbol(GV), Ctx);
978 if (const BlockAddress *BA = dyn_cast<BlockAddress>(CV))
979 return MCSymbolRefExpr::Create(AP.GetBlockAddressSymbol(BA), Ctx);
981 const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV);
983 llvm_unreachable("Unknown constant value to lower!");
984 return MCConstantExpr::Create(0, Ctx);
987 switch (CE->getOpcode()) {
989 // If the code isn't optimized, there may be outstanding folding
990 // opportunities. Attempt to fold the expression using TargetData as a
991 // last resort before giving up.
993 ConstantFoldConstantExpression(CE, AP.TM.getTargetData()))
995 return LowerConstant(C, AP);
999 llvm_unreachable("FIXME: Don't support this constant expr");
1000 case Instruction::GetElementPtr: {
1001 const TargetData &TD = *AP.TM.getTargetData();
1002 // Generate a symbolic expression for the byte address
1003 const Constant *PtrVal = CE->getOperand(0);
1004 SmallVector<Value*, 8> IdxVec(CE->op_begin()+1, CE->op_end());
1005 int64_t Offset = TD.getIndexedOffset(PtrVal->getType(), &IdxVec[0],
1008 const MCExpr *Base = LowerConstant(CE->getOperand(0), AP);
1012 // Truncate/sext the offset to the pointer size.
1013 if (TD.getPointerSizeInBits() != 64) {
1014 int SExtAmount = 64-TD.getPointerSizeInBits();
1015 Offset = (Offset << SExtAmount) >> SExtAmount;
1018 return MCBinaryExpr::CreateAdd(Base, MCConstantExpr::Create(Offset, Ctx),
1022 case Instruction::Trunc:
1023 // We emit the value and depend on the assembler to truncate the generated
1024 // expression properly. This is important for differences between
1025 // blockaddress labels. Since the two labels are in the same function, it
1026 // is reasonable to treat their delta as a 32-bit value.
1028 case Instruction::BitCast:
1029 return LowerConstant(CE->getOperand(0), AP);
1031 case Instruction::IntToPtr: {
1032 const TargetData &TD = *AP.TM.getTargetData();
1033 // Handle casts to pointers by changing them into casts to the appropriate
1034 // integer type. This promotes constant folding and simplifies this code.
1035 Constant *Op = CE->getOperand(0);
1036 Op = ConstantExpr::getIntegerCast(Op, TD.getIntPtrType(CV->getContext()),
1038 return LowerConstant(Op, AP);
1041 case Instruction::PtrToInt: {
1042 const TargetData &TD = *AP.TM.getTargetData();
1043 // Support only foldable casts to/from pointers that can be eliminated by
1044 // changing the pointer to the appropriately sized integer type.
1045 Constant *Op = CE->getOperand(0);
1046 const Type *Ty = CE->getType();
1048 const MCExpr *OpExpr = LowerConstant(Op, AP);
1050 // We can emit the pointer value into this slot if the slot is an
1051 // integer slot equal to the size of the pointer.
1052 if (TD.getTypeAllocSize(Ty) == TD.getTypeAllocSize(Op->getType()))
1055 // Otherwise the pointer is smaller than the resultant integer, mask off
1056 // the high bits so we are sure to get a proper truncation if the input is
1058 unsigned InBits = TD.getTypeAllocSizeInBits(Op->getType());
1059 const MCExpr *MaskExpr = MCConstantExpr::Create(~0ULL >> (64-InBits), Ctx);
1060 return MCBinaryExpr::CreateAnd(OpExpr, MaskExpr, Ctx);
1063 // The MC library also has a right-shift operator, but it isn't consistently
1064 // signed or unsigned between different targets.
1065 case Instruction::Add:
1066 case Instruction::Sub:
1067 case Instruction::Mul:
1068 case Instruction::SDiv:
1069 case Instruction::SRem:
1070 case Instruction::Shl:
1071 case Instruction::And:
1072 case Instruction::Or:
1073 case Instruction::Xor: {
1074 const MCExpr *LHS = LowerConstant(CE->getOperand(0), AP);
1075 const MCExpr *RHS = LowerConstant(CE->getOperand(1), AP);
1076 switch (CE->getOpcode()) {
1077 default: llvm_unreachable("Unknown binary operator constant cast expr");
1078 case Instruction::Add: return MCBinaryExpr::CreateAdd(LHS, RHS, Ctx);
1079 case Instruction::Sub: return MCBinaryExpr::CreateSub(LHS, RHS, Ctx);
1080 case Instruction::Mul: return MCBinaryExpr::CreateMul(LHS, RHS, Ctx);
1081 case Instruction::SDiv: return MCBinaryExpr::CreateDiv(LHS, RHS, Ctx);
1082 case Instruction::SRem: return MCBinaryExpr::CreateMod(LHS, RHS, Ctx);
1083 case Instruction::Shl: return MCBinaryExpr::CreateShl(LHS, RHS, Ctx);
1084 case Instruction::And: return MCBinaryExpr::CreateAnd(LHS, RHS, Ctx);
1085 case Instruction::Or: return MCBinaryExpr::CreateOr (LHS, RHS, Ctx);
1086 case Instruction::Xor: return MCBinaryExpr::CreateXor(LHS, RHS, Ctx);
1092 static void EmitGlobalConstantArray(const ConstantArray *CA, unsigned AddrSpace,
1094 if (AddrSpace != 0 || !CA->isString()) {
1095 // Not a string. Print the values in successive locations
1096 for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i)
1097 AP.EmitGlobalConstant(CA->getOperand(i), AddrSpace);
1101 // Otherwise, it can be emitted as .ascii.
1102 SmallVector<char, 128> TmpVec;
1103 TmpVec.reserve(CA->getNumOperands());
1104 for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i)
1105 TmpVec.push_back(cast<ConstantInt>(CA->getOperand(i))->getZExtValue());
1107 AP.OutStreamer.EmitBytes(StringRef(TmpVec.data(), TmpVec.size()), AddrSpace);
1110 static void EmitGlobalConstantVector(const ConstantVector *CV,
1111 unsigned AddrSpace, AsmPrinter &AP) {
1112 for (unsigned i = 0, e = CV->getType()->getNumElements(); i != e; ++i)
1113 AP.EmitGlobalConstant(CV->getOperand(i), AddrSpace);
1116 static void EmitGlobalConstantStruct(const ConstantStruct *CS,
1117 unsigned AddrSpace, AsmPrinter &AP) {
1118 // Print the fields in successive locations. Pad to align if needed!
1119 const TargetData *TD = AP.TM.getTargetData();
1120 unsigned Size = TD->getTypeAllocSize(CS->getType());
1121 const StructLayout *Layout = TD->getStructLayout(CS->getType());
1122 uint64_t SizeSoFar = 0;
1123 for (unsigned i = 0, e = CS->getNumOperands(); i != e; ++i) {
1124 const Constant *Field = CS->getOperand(i);
1126 // Check if padding is needed and insert one or more 0s.
1127 uint64_t FieldSize = TD->getTypeAllocSize(Field->getType());
1128 uint64_t PadSize = ((i == e-1 ? Size : Layout->getElementOffset(i+1))
1129 - Layout->getElementOffset(i)) - FieldSize;
1130 SizeSoFar += FieldSize + PadSize;
1132 // Now print the actual field value.
1133 AP.EmitGlobalConstant(Field, AddrSpace);
1135 // Insert padding - this may include padding to increase the size of the
1136 // current field up to the ABI size (if the struct is not packed) as well
1137 // as padding to ensure that the next field starts at the right offset.
1138 AP.OutStreamer.EmitZeros(PadSize, AddrSpace);
1140 assert(SizeSoFar == Layout->getSizeInBytes() &&
1141 "Layout of constant struct may be incorrect!");
1144 static void EmitGlobalConstantUnion(const ConstantUnion *CU,
1145 unsigned AddrSpace, AsmPrinter &AP) {
1146 const TargetData *TD = AP.TM.getTargetData();
1147 unsigned Size = TD->getTypeAllocSize(CU->getType());
1149 const Constant *Contents = CU->getOperand(0);
1150 unsigned FilledSize = TD->getTypeAllocSize(Contents->getType());
1152 // Print the actually filled part
1153 AP.EmitGlobalConstant(Contents, AddrSpace);
1155 // And pad with enough zeroes
1156 AP.OutStreamer.EmitZeros(Size-FilledSize, AddrSpace);
1159 static void EmitGlobalConstantFP(const ConstantFP *CFP, unsigned AddrSpace,
1161 // FP Constants are printed as integer constants to avoid losing
1163 if (CFP->getType()->isDoubleTy()) {
1164 if (AP.VerboseAsm) {
1165 double Val = CFP->getValueAPF().convertToDouble();
1166 AP.OutStreamer.GetCommentOS() << "double " << Val << '\n';
1169 uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1170 AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace);
1174 if (CFP->getType()->isFloatTy()) {
1175 if (AP.VerboseAsm) {
1176 float Val = CFP->getValueAPF().convertToFloat();
1177 AP.OutStreamer.GetCommentOS() << "float " << Val << '\n';
1179 uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1180 AP.OutStreamer.EmitIntValue(Val, 4, AddrSpace);
1184 if (CFP->getType()->isX86_FP80Ty()) {
1185 // all long double variants are printed as hex
1186 // api needed to prevent premature destruction
1187 APInt API = CFP->getValueAPF().bitcastToAPInt();
1188 const uint64_t *p = API.getRawData();
1189 if (AP.VerboseAsm) {
1190 // Convert to double so we can print the approximate val as a comment.
1191 APFloat DoubleVal = CFP->getValueAPF();
1193 DoubleVal.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven,
1195 AP.OutStreamer.GetCommentOS() << "x86_fp80 ~= "
1196 << DoubleVal.convertToDouble() << '\n';
1199 if (AP.TM.getTargetData()->isBigEndian()) {
1200 AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace);
1201 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1203 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1204 AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace);
1207 // Emit the tail padding for the long double.
1208 const TargetData &TD = *AP.TM.getTargetData();
1209 AP.OutStreamer.EmitZeros(TD.getTypeAllocSize(CFP->getType()) -
1210 TD.getTypeStoreSize(CFP->getType()), AddrSpace);
1214 assert(CFP->getType()->isPPC_FP128Ty() &&
1215 "Floating point constant type not handled");
1216 // All long double variants are printed as hex api needed to prevent
1217 // premature destruction.
1218 APInt API = CFP->getValueAPF().bitcastToAPInt();
1219 const uint64_t *p = API.getRawData();
1220 if (AP.TM.getTargetData()->isBigEndian()) {
1221 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1222 AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace);
1224 AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace);
1225 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1229 static void EmitGlobalConstantLargeInt(const ConstantInt *CI,
1230 unsigned AddrSpace, AsmPrinter &AP) {
1231 const TargetData *TD = AP.TM.getTargetData();
1232 unsigned BitWidth = CI->getBitWidth();
1233 assert((BitWidth & 63) == 0 && "only support multiples of 64-bits");
1235 // We don't expect assemblers to support integer data directives
1236 // for more than 64 bits, so we emit the data in at most 64-bit
1237 // quantities at a time.
1238 const uint64_t *RawData = CI->getValue().getRawData();
1239 for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) {
1240 uint64_t Val = TD->isBigEndian() ? RawData[e - i - 1] : RawData[i];
1241 AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace);
1245 /// EmitGlobalConstant - Print a general LLVM constant to the .s file.
1246 void AsmPrinter::EmitGlobalConstant(const Constant *CV, unsigned AddrSpace) {
1247 if (isa<ConstantAggregateZero>(CV) || isa<UndefValue>(CV)) {
1248 uint64_t Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
1249 if (Size == 0) Size = 1; // An empty "_foo:" followed by a section is undef.
1250 return OutStreamer.EmitZeros(Size, AddrSpace);
1253 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
1254 unsigned Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
1261 OutStreamer.GetCommentOS() << format("0x%llx\n", CI->getZExtValue());
1262 OutStreamer.EmitIntValue(CI->getZExtValue(), Size, AddrSpace);
1265 EmitGlobalConstantLargeInt(CI, AddrSpace, *this);
1270 if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV))
1271 return EmitGlobalConstantArray(CVA, AddrSpace, *this);
1273 if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV))
1274 return EmitGlobalConstantStruct(CVS, AddrSpace, *this);
1276 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV))
1277 return EmitGlobalConstantFP(CFP, AddrSpace, *this);
1279 if (isa<ConstantPointerNull>(CV)) {
1280 unsigned Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
1281 OutStreamer.EmitIntValue(0, Size, AddrSpace);
1285 if (const ConstantUnion *CVU = dyn_cast<ConstantUnion>(CV))
1286 return EmitGlobalConstantUnion(CVU, AddrSpace, *this);
1288 if (const ConstantVector *V = dyn_cast<ConstantVector>(CV))
1289 return EmitGlobalConstantVector(V, AddrSpace, *this);
1291 // Otherwise, it must be a ConstantExpr. Lower it to an MCExpr, then emit it
1292 // thread the streamer with EmitValue.
1293 OutStreamer.EmitValue(LowerConstant(CV, *this),
1294 TM.getTargetData()->getTypeAllocSize(CV->getType()),
1298 void AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
1299 // Target doesn't support this yet!
1300 llvm_unreachable("Target does not support EmitMachineConstantPoolValue");
1303 /// PrintSpecial - Print information related to the specified machine instr
1304 /// that is independent of the operand, and may be independent of the instr
1305 /// itself. This can be useful for portably encoding the comment character
1306 /// or other bits of target-specific knowledge into the asmstrings. The
1307 /// syntax used is ${:comment}. Targets can override this to add support
1308 /// for their own strange codes.
1309 void AsmPrinter::PrintSpecial(const MachineInstr *MI, const char *Code) const {
1310 if (!strcmp(Code, "private")) {
1311 O << MAI->getPrivateGlobalPrefix();
1312 } else if (!strcmp(Code, "comment")) {
1314 O << MAI->getCommentString();
1315 } else if (!strcmp(Code, "uid")) {
1316 // Comparing the address of MI isn't sufficient, because machineinstrs may
1317 // be allocated to the same address across functions.
1318 const Function *ThisF = MI->getParent()->getParent()->getFunction();
1320 // If this is a new LastFn instruction, bump the counter.
1321 if (LastMI != MI || LastFn != ThisF) {
1329 raw_string_ostream Msg(msg);
1330 Msg << "Unknown special formatter '" << Code
1331 << "' for machine instr: " << *MI;
1332 llvm_report_error(Msg.str());
1336 /// processDebugLoc - Processes the debug information of each machine
1337 /// instruction's DebugLoc.
1338 void AsmPrinter::processDebugLoc(const MachineInstr *MI,
1339 bool BeforePrintingInsn) {
1340 if (!MAI || !DW || !MAI->doesSupportDebugInformation()
1341 || !DW->ShouldEmitDwarfDebug())
1344 if (!BeforePrintingInsn)
1345 // After printing instruction
1352 /// printInlineAsm - This method formats and prints the specified machine
1353 /// instruction that is an inline asm.
1354 void AsmPrinter::printInlineAsm(const MachineInstr *MI) const {
1355 unsigned NumOperands = MI->getNumOperands();
1357 // Count the number of register definitions.
1358 unsigned NumDefs = 0;
1359 for (; MI->getOperand(NumDefs).isReg() && MI->getOperand(NumDefs).isDef();
1361 assert(NumDefs != NumOperands-1 && "No asm string?");
1363 assert(MI->getOperand(NumDefs).isSymbol() && "No asm string?");
1365 // Disassemble the AsmStr, printing out the literal pieces, the operands, etc.
1366 const char *AsmStr = MI->getOperand(NumDefs).getSymbolName();
1370 // If this asmstr is empty, just print the #APP/#NOAPP markers.
1371 // These are useful to see where empty asm's wound up.
1372 if (AsmStr[0] == 0) {
1373 O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t";
1374 O << MAI->getCommentString() << MAI->getInlineAsmEnd() << '\n';
1378 O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t";
1380 // The variant of the current asmprinter.
1381 int AsmPrinterVariant = MAI->getAssemblerDialect();
1383 int CurVariant = -1; // The number of the {.|.|.} region we are in.
1384 const char *LastEmitted = AsmStr; // One past the last character emitted.
1386 while (*LastEmitted) {
1387 switch (*LastEmitted) {
1389 // Not a special case, emit the string section literally.
1390 const char *LiteralEnd = LastEmitted+1;
1391 while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' &&
1392 *LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n')
1394 if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1395 O.write(LastEmitted, LiteralEnd-LastEmitted);
1396 LastEmitted = LiteralEnd;
1400 ++LastEmitted; // Consume newline character.
1401 O << '\n'; // Indent code with newline.
1404 ++LastEmitted; // Consume '$' character.
1408 switch (*LastEmitted) {
1409 default: Done = false; break;
1410 case '$': // $$ -> $
1411 if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1413 ++LastEmitted; // Consume second '$' character.
1415 case '(': // $( -> same as GCC's { character.
1416 ++LastEmitted; // Consume '(' character.
1417 if (CurVariant != -1) {
1418 llvm_report_error("Nested variants found in inline asm string: '"
1419 + std::string(AsmStr) + "'");
1421 CurVariant = 0; // We're in the first variant now.
1424 ++LastEmitted; // consume '|' character.
1425 if (CurVariant == -1)
1426 O << '|'; // this is gcc's behavior for | outside a variant
1428 ++CurVariant; // We're in the next variant.
1430 case ')': // $) -> same as GCC's } char.
1431 ++LastEmitted; // consume ')' character.
1432 if (CurVariant == -1)
1433 O << '}'; // this is gcc's behavior for } outside a variant
1440 bool HasCurlyBraces = false;
1441 if (*LastEmitted == '{') { // ${variable}
1442 ++LastEmitted; // Consume '{' character.
1443 HasCurlyBraces = true;
1446 // If we have ${:foo}, then this is not a real operand reference, it is a
1447 // "magic" string reference, just like in .td files. Arrange to call
1449 if (HasCurlyBraces && *LastEmitted == ':') {
1451 const char *StrStart = LastEmitted;
1452 const char *StrEnd = strchr(StrStart, '}');
1454 llvm_report_error("Unterminated ${:foo} operand in inline asm string: '"
1455 + std::string(AsmStr) + "'");
1458 std::string Val(StrStart, StrEnd);
1459 PrintSpecial(MI, Val.c_str());
1460 LastEmitted = StrEnd+1;
1464 const char *IDStart = LastEmitted;
1467 long Val = strtol(IDStart, &IDEnd, 10); // We only accept numbers for IDs.
1468 if (!isdigit(*IDStart) || (Val == 0 && errno == EINVAL)) {
1469 llvm_report_error("Bad $ operand number in inline asm string: '"
1470 + std::string(AsmStr) + "'");
1472 LastEmitted = IDEnd;
1474 char Modifier[2] = { 0, 0 };
1476 if (HasCurlyBraces) {
1477 // If we have curly braces, check for a modifier character. This
1478 // supports syntax like ${0:u}, which correspond to "%u0" in GCC asm.
1479 if (*LastEmitted == ':') {
1480 ++LastEmitted; // Consume ':' character.
1481 if (*LastEmitted == 0) {
1482 llvm_report_error("Bad ${:} expression in inline asm string: '"
1483 + std::string(AsmStr) + "'");
1486 Modifier[0] = *LastEmitted;
1487 ++LastEmitted; // Consume modifier character.
1490 if (*LastEmitted != '}') {
1491 llvm_report_error("Bad ${} expression in inline asm string: '"
1492 + std::string(AsmStr) + "'");
1494 ++LastEmitted; // Consume '}' character.
1497 if ((unsigned)Val >= NumOperands-1) {
1498 llvm_report_error("Invalid $ operand number in inline asm string: '"
1499 + std::string(AsmStr) + "'");
1502 // Okay, we finally have a value number. Ask the target to print this
1504 if (CurVariant == -1 || CurVariant == AsmPrinterVariant) {
1509 // Scan to find the machine operand number for the operand.
1510 for (; Val; --Val) {
1511 if (OpNo >= MI->getNumOperands()) break;
1512 unsigned OpFlags = MI->getOperand(OpNo).getImm();
1513 OpNo += InlineAsm::getNumOperandRegisters(OpFlags) + 1;
1516 if (OpNo >= MI->getNumOperands()) {
1519 unsigned OpFlags = MI->getOperand(OpNo).getImm();
1520 ++OpNo; // Skip over the ID number.
1522 if (Modifier[0] == 'l') // labels are target independent
1523 O << *MI->getOperand(OpNo).getMBB()->getSymbol();
1525 AsmPrinter *AP = const_cast<AsmPrinter*>(this);
1526 if ((OpFlags & 7) == 4) {
1527 Error = AP->PrintAsmMemoryOperand(MI, OpNo, AsmPrinterVariant,
1528 Modifier[0] ? Modifier : 0);
1530 Error = AP->PrintAsmOperand(MI, OpNo, AsmPrinterVariant,
1531 Modifier[0] ? Modifier : 0);
1537 raw_string_ostream Msg(msg);
1538 Msg << "Invalid operand found in inline asm: '" << AsmStr << "'\n";
1540 llvm_report_error(Msg.str());
1547 O << "\n\t" << MAI->getCommentString() << MAI->getInlineAsmEnd();
1548 OutStreamer.AddBlankLine();
1551 /// printImplicitDef - This method prints the specified machine instruction
1552 /// that is an implicit def.
1553 void AsmPrinter::printImplicitDef(const MachineInstr *MI) const {
1554 if (!VerboseAsm) return;
1555 O.PadToColumn(MAI->getCommentColumn());
1556 O << MAI->getCommentString() << " implicit-def: "
1557 << TRI->getName(MI->getOperand(0).getReg());
1558 OutStreamer.AddBlankLine();
1561 void AsmPrinter::printKill(const MachineInstr *MI) const {
1562 if (!VerboseAsm) return;
1563 O.PadToColumn(MAI->getCommentColumn());
1564 O << MAI->getCommentString() << " kill:";
1565 for (unsigned n = 0, e = MI->getNumOperands(); n != e; ++n) {
1566 const MachineOperand &op = MI->getOperand(n);
1567 assert(op.isReg() && "KILL instruction must have only register operands");
1568 O << ' ' << TRI->getName(op.getReg()) << (op.isDef() ? "<def>" : "<kill>");
1570 OutStreamer.AddBlankLine();
1573 /// printLabel - This method prints a local label used by debug and
1574 /// exception handling tables.
1575 void AsmPrinter::printLabelInst(const MachineInstr *MI) const {
1576 OutStreamer.EmitLabel(MI->getOperand(0).getMCSymbol());
1579 /// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
1580 /// instruction, using the specified assembler variant. Targets should
1581 /// override this to format as appropriate.
1582 bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
1583 unsigned AsmVariant, const char *ExtraCode) {
1584 // Target doesn't support this yet!
1588 bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
1589 unsigned AsmVariant,
1590 const char *ExtraCode) {
1591 // Target doesn't support this yet!
1595 MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BlockAddress *BA) const {
1596 return MMI->getAddrLabelSymbol(BA->getBasicBlock());
1599 MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BasicBlock *BB) const {
1600 return MMI->getAddrLabelSymbol(BB);
1603 /// GetCPISymbol - Return the symbol for the specified constant pool entry.
1604 MCSymbol *AsmPrinter::GetCPISymbol(unsigned CPID) const {
1605 return OutContext.GetOrCreateSymbol
1606 (Twine(MAI->getPrivateGlobalPrefix()) + "CPI" + Twine(getFunctionNumber())
1607 + "_" + Twine(CPID));
1610 /// GetJTISymbol - Return the symbol for the specified jump table entry.
1611 MCSymbol *AsmPrinter::GetJTISymbol(unsigned JTID, bool isLinkerPrivate) const {
1612 return MF->getJTISymbol(JTID, OutContext, isLinkerPrivate);
1615 /// GetJTSetSymbol - Return the symbol for the specified jump table .set
1616 /// FIXME: privatize to AsmPrinter.
1617 MCSymbol *AsmPrinter::GetJTSetSymbol(unsigned UID, unsigned MBBID) const {
1618 return OutContext.GetOrCreateSymbol
1619 (Twine(MAI->getPrivateGlobalPrefix()) + Twine(getFunctionNumber()) + "_" +
1620 Twine(UID) + "_set_" + Twine(MBBID));
1623 /// GetSymbolWithGlobalValueBase - Return the MCSymbol for a symbol with
1624 /// global value name as its base, with the specified suffix, and where the
1625 /// symbol is forced to have private linkage if ForcePrivate is true.
1626 MCSymbol *AsmPrinter::GetSymbolWithGlobalValueBase(const GlobalValue *GV,
1628 bool ForcePrivate) const {
1629 SmallString<60> NameStr;
1630 Mang->getNameWithPrefix(NameStr, GV, ForcePrivate);
1631 NameStr.append(Suffix.begin(), Suffix.end());
1632 return OutContext.GetOrCreateSymbol(NameStr.str());
1635 /// GetExternalSymbolSymbol - Return the MCSymbol for the specified
1637 MCSymbol *AsmPrinter::GetExternalSymbolSymbol(StringRef Sym) const {
1638 SmallString<60> NameStr;
1639 Mang->getNameWithPrefix(NameStr, Sym);
1640 return OutContext.GetOrCreateSymbol(NameStr.str());
1645 /// PrintParentLoopComment - Print comments about parent loops of this one.
1646 static void PrintParentLoopComment(raw_ostream &OS, const MachineLoop *Loop,
1647 unsigned FunctionNumber) {
1648 if (Loop == 0) return;
1649 PrintParentLoopComment(OS, Loop->getParentLoop(), FunctionNumber);
1650 OS.indent(Loop->getLoopDepth()*2)
1651 << "Parent Loop BB" << FunctionNumber << "_"
1652 << Loop->getHeader()->getNumber()
1653 << " Depth=" << Loop->getLoopDepth() << '\n';
1657 /// PrintChildLoopComment - Print comments about child loops within
1658 /// the loop for this basic block, with nesting.
1659 static void PrintChildLoopComment(raw_ostream &OS, const MachineLoop *Loop,
1660 unsigned FunctionNumber) {
1661 // Add child loop information
1662 for (MachineLoop::iterator CL = Loop->begin(), E = Loop->end();CL != E; ++CL){
1663 OS.indent((*CL)->getLoopDepth()*2)
1664 << "Child Loop BB" << FunctionNumber << "_"
1665 << (*CL)->getHeader()->getNumber() << " Depth " << (*CL)->getLoopDepth()
1667 PrintChildLoopComment(OS, *CL, FunctionNumber);
1671 /// PrintBasicBlockLoopComments - Pretty-print comments for basic blocks.
1672 static void PrintBasicBlockLoopComments(const MachineBasicBlock &MBB,
1673 const MachineLoopInfo *LI,
1674 const AsmPrinter &AP) {
1675 // Add loop depth information
1676 const MachineLoop *Loop = LI->getLoopFor(&MBB);
1677 if (Loop == 0) return;
1679 MachineBasicBlock *Header = Loop->getHeader();
1680 assert(Header && "No header for loop");
1682 // If this block is not a loop header, just print out what is the loop header
1684 if (Header != &MBB) {
1685 AP.OutStreamer.AddComment(" in Loop: Header=BB" +
1686 Twine(AP.getFunctionNumber())+"_" +
1687 Twine(Loop->getHeader()->getNumber())+
1688 " Depth="+Twine(Loop->getLoopDepth()));
1692 // Otherwise, it is a loop header. Print out information about child and
1694 raw_ostream &OS = AP.OutStreamer.GetCommentOS();
1696 PrintParentLoopComment(OS, Loop->getParentLoop(), AP.getFunctionNumber());
1699 OS.indent(Loop->getLoopDepth()*2-2);
1704 OS << "Loop Header: Depth=" + Twine(Loop->getLoopDepth()) << '\n';
1706 PrintChildLoopComment(OS, Loop, AP.getFunctionNumber());
1710 /// EmitBasicBlockStart - This method prints the label for the specified
1711 /// MachineBasicBlock, an alignment (if present) and a comment describing
1712 /// it if appropriate.
1713 void AsmPrinter::EmitBasicBlockStart(const MachineBasicBlock *MBB) const {
1714 // Emit an alignment directive for this block, if needed.
1715 if (unsigned Align = MBB->getAlignment())
1716 EmitAlignment(Log2_32(Align));
1718 // If the block has its address taken, emit any labels that were used to
1719 // reference the block. It is possible that there is more than one label
1720 // here, because multiple LLVM BB's may have been RAUW'd to this block after
1721 // the references were generated.
1722 if (MBB->hasAddressTaken()) {
1723 const BasicBlock *BB = MBB->getBasicBlock();
1725 OutStreamer.AddComment("Block address taken");
1727 std::vector<MCSymbol*> Syms = MMI->getAddrLabelSymbolToEmit(BB);
1729 for (unsigned i = 0, e = Syms.size(); i != e; ++i)
1730 OutStreamer.EmitLabel(Syms[i]);
1733 // Print the main label for the block.
1734 if (MBB->pred_empty() || isBlockOnlyReachableByFallthrough(MBB)) {
1736 // NOTE: Want this comment at start of line.
1737 O << MAI->getCommentString() << " BB#" << MBB->getNumber() << ':';
1738 if (const BasicBlock *BB = MBB->getBasicBlock())
1740 OutStreamer.AddComment("%" + BB->getName());
1742 PrintBasicBlockLoopComments(*MBB, LI, *this);
1743 OutStreamer.AddBlankLine();
1747 if (const BasicBlock *BB = MBB->getBasicBlock())
1749 OutStreamer.AddComment("%" + BB->getName());
1750 PrintBasicBlockLoopComments(*MBB, LI, *this);
1753 OutStreamer.EmitLabel(MBB->getSymbol());
1757 void AsmPrinter::EmitVisibility(MCSymbol *Sym, unsigned Visibility) const {
1758 MCSymbolAttr Attr = MCSA_Invalid;
1760 switch (Visibility) {
1762 case GlobalValue::HiddenVisibility:
1763 Attr = MAI->getHiddenVisibilityAttr();
1765 case GlobalValue::ProtectedVisibility:
1766 Attr = MAI->getProtectedVisibilityAttr();
1770 if (Attr != MCSA_Invalid)
1771 OutStreamer.EmitSymbolAttribute(Sym, Attr);
1774 void AsmPrinter::printOffset(int64_t Offset) const {
1777 else if (Offset < 0)
1781 /// isBlockOnlyReachableByFallthough - Return true if the basic block has
1782 /// exactly one predecessor and the control transfer mechanism between
1783 /// the predecessor and this block is a fall-through.
1784 bool AsmPrinter::isBlockOnlyReachableByFallthrough(const MachineBasicBlock *MBB)
1786 // If this is a landing pad, it isn't a fall through. If it has no preds,
1787 // then nothing falls through to it.
1788 if (MBB->isLandingPad() || MBB->pred_empty())
1791 // If there isn't exactly one predecessor, it can't be a fall through.
1792 MachineBasicBlock::const_pred_iterator PI = MBB->pred_begin(), PI2 = PI;
1794 if (PI2 != MBB->pred_end())
1797 // The predecessor has to be immediately before this block.
1798 const MachineBasicBlock *Pred = *PI;
1800 if (!Pred->isLayoutSuccessor(MBB))
1803 // If the block is completely empty, then it definitely does fall through.
1807 // Otherwise, check the last instruction.
1808 const MachineInstr &LastInst = Pred->back();
1809 return !LastInst.getDesc().isBarrier();
1814 GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy *S) {
1815 if (!S->usesMetadata())
1818 gcp_iterator GCPI = GCMetadataPrinters.find(S);
1819 if (GCPI != GCMetadataPrinters.end())
1820 return GCPI->second;
1822 const char *Name = S->getName().c_str();
1824 for (GCMetadataPrinterRegistry::iterator
1825 I = GCMetadataPrinterRegistry::begin(),
1826 E = GCMetadataPrinterRegistry::end(); I != E; ++I)
1827 if (strcmp(Name, I->getName()) == 0) {
1828 GCMetadataPrinter *GMP = I->instantiate();
1830 GCMetadataPrinters.insert(std::make_pair(S, GMP));
1834 llvm_report_error("no GCMetadataPrinter registered for GC: " + Twine(Name));