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 #include "llvm/CodeGen/AsmPrinter.h"
15 #include "llvm/Assembly/Writer.h"
16 #include "llvm/DerivedTypes.h"
17 #include "llvm/Constants.h"
18 #include "llvm/Module.h"
19 #include "llvm/CodeGen/DwarfWriter.h"
20 #include "llvm/CodeGen/GCMetadataPrinter.h"
21 #include "llvm/CodeGen/MachineConstantPool.h"
22 #include "llvm/CodeGen/MachineFrameInfo.h"
23 #include "llvm/CodeGen/MachineFunction.h"
24 #include "llvm/CodeGen/MachineJumpTableInfo.h"
25 #include "llvm/CodeGen/MachineLoopInfo.h"
26 #include "llvm/CodeGen/MachineModuleInfo.h"
27 #include "llvm/Analysis/DebugInfo.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/Support/CommandLine.h"
35 #include "llvm/Support/ErrorHandling.h"
36 #include "llvm/Support/Format.h"
37 #include "llvm/Support/FormattedStream.h"
38 #include "llvm/MC/MCAsmInfo.h"
39 #include "llvm/Target/Mangler.h"
40 #include "llvm/Target/TargetData.h"
41 #include "llvm/Target/TargetInstrInfo.h"
42 #include "llvm/Target/TargetLowering.h"
43 #include "llvm/Target/TargetLoweringObjectFile.h"
44 #include "llvm/Target/TargetOptions.h"
45 #include "llvm/Target/TargetRegisterInfo.h"
46 #include "llvm/ADT/SmallPtrSet.h"
47 #include "llvm/ADT/SmallString.h"
51 static cl::opt<cl::boolOrDefault>
52 AsmVerbose("asm-verbose", cl::desc("Add comments to directives."),
53 cl::init(cl::BOU_UNSET));
55 static bool getVerboseAsm(bool VDef) {
58 case cl::BOU_UNSET: return VDef;
59 case cl::BOU_TRUE: return true;
60 case cl::BOU_FALSE: return false;
64 char AsmPrinter::ID = 0;
65 AsmPrinter::AsmPrinter(formatted_raw_ostream &o, TargetMachine &tm,
66 const MCAsmInfo *T, bool VDef)
67 : MachineFunctionPass(&ID), O(o),
68 TM(tm), MAI(T), TRI(tm.getRegisterInfo()),
70 OutContext(*new MCContext()),
71 // FIXME: Pass instprinter to streamer.
72 OutStreamer(*createAsmStreamer(OutContext, O, *T,
73 TM.getTargetData()->isLittleEndian(),
74 getVerboseAsm(VDef), 0)),
76 LastMI(0), LastFn(0), Counter(~0U), PrevDLT(NULL) {
78 VerboseAsm = getVerboseAsm(VDef);
81 AsmPrinter::~AsmPrinter() {
82 for (gcp_iterator I = GCMetadataPrinters.begin(),
83 E = GCMetadataPrinters.end(); I != E; ++I)
90 /// getFunctionNumber - Return a unique ID for the current function.
92 unsigned AsmPrinter::getFunctionNumber() const {
93 return MF->getFunctionNumber();
96 TargetLoweringObjectFile &AsmPrinter::getObjFileLowering() const {
97 return TM.getTargetLowering()->getObjFileLowering();
100 /// getCurrentSection() - Return the current section we are emitting to.
101 const MCSection *AsmPrinter::getCurrentSection() const {
102 return OutStreamer.getCurrentSection();
106 void AsmPrinter::getAnalysisUsage(AnalysisUsage &AU) const {
107 AU.setPreservesAll();
108 MachineFunctionPass::getAnalysisUsage(AU);
109 AU.addRequired<GCModuleInfo>();
111 AU.addRequired<MachineLoopInfo>();
114 bool AsmPrinter::doInitialization(Module &M) {
115 // Initialize TargetLoweringObjectFile.
116 const_cast<TargetLoweringObjectFile&>(getObjFileLowering())
117 .Initialize(OutContext, TM);
119 Mang = new Mangler(*MAI);
121 // Allow the target to emit any magic that it wants at the start of the file.
122 EmitStartOfAsmFile(M);
124 // Very minimal debug info. It is ignored if we emit actual debug info. If we
125 // don't, this at least helps the user find where a global came from.
126 if (MAI->hasSingleParameterDotFile()) {
128 OutStreamer.EmitFileDirective(M.getModuleIdentifier());
131 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
132 assert(MI && "AsmPrinter didn't require GCModuleInfo?");
133 for (GCModuleInfo::iterator I = MI->begin(), E = MI->end(); I != E; ++I)
134 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I))
135 MP->beginAssembly(O, *this, *MAI);
137 if (!M.getModuleInlineAsm().empty())
138 O << MAI->getCommentString() << " Start of file scope inline assembly\n"
139 << M.getModuleInlineAsm()
140 << '\n' << MAI->getCommentString()
141 << " End of file scope inline assembly\n";
143 MMI = getAnalysisIfAvailable<MachineModuleInfo>();
145 MMI->AnalyzeModule(M);
146 DW = getAnalysisIfAvailable<DwarfWriter>();
148 DW->BeginModule(&M, MMI, O, this, MAI);
153 /// EmitGlobalVariable - Emit the specified global variable to the .s file.
154 void AsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) {
155 if (!GV->hasInitializer()) // External globals require no code.
158 // Check to see if this is a special global used by LLVM, if so, emit it.
159 if (EmitSpecialLLVMGlobal(GV))
162 MCSymbol *GVSym = GetGlobalValueSymbol(GV);
163 printVisibility(GVSym, GV->getVisibility());
165 if (MAI->hasDotTypeDotSizeDirective())
166 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_ELF_TypeObject);
168 SectionKind GVKind = TargetLoweringObjectFile::getKindForGlobal(GV, TM);
170 const TargetData *TD = TM.getTargetData();
171 unsigned Size = TD->getTypeAllocSize(GV->getType()->getElementType());
172 unsigned AlignLog = TD->getPreferredAlignmentLog(GV);
174 // Handle common and BSS local symbols (.lcomm).
175 if (GVKind.isCommon() || GVKind.isBSSLocal()) {
176 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
179 WriteAsOperand(OutStreamer.GetCommentOS(), GV,
180 /*PrintType=*/false, GV->getParent());
181 OutStreamer.GetCommentOS() << '\n';
184 // Handle common symbols.
185 if (GVKind.isCommon()) {
187 OutStreamer.EmitCommonSymbol(GVSym, Size, 1 << AlignLog);
191 // Handle local BSS symbols.
192 if (MAI->hasMachoZeroFillDirective()) {
193 const MCSection *TheSection =
194 getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM);
195 // .zerofill __DATA, __bss, _foo, 400, 5
196 OutStreamer.EmitZerofill(TheSection, GVSym, Size, 1 << AlignLog);
200 if (MAI->hasLCOMMDirective()) {
202 OutStreamer.EmitLocalCommonSymbol(GVSym, Size);
207 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Local);
209 OutStreamer.EmitCommonSymbol(GVSym, Size, 1 << AlignLog);
213 const MCSection *TheSection =
214 getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM);
216 // Handle the zerofill directive on darwin, which is a special form of BSS
218 if (GVKind.isBSSExtern() && MAI->hasMachoZeroFillDirective()) {
220 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
221 // .zerofill __DATA, __common, _foo, 400, 5
222 OutStreamer.EmitZerofill(TheSection, GVSym, Size, 1 << AlignLog);
226 OutStreamer.SwitchSection(TheSection);
228 // TODO: Factor into an 'emit linkage' thing that is shared with function
230 switch (GV->getLinkage()) {
231 case GlobalValue::CommonLinkage:
232 case GlobalValue::LinkOnceAnyLinkage:
233 case GlobalValue::LinkOnceODRLinkage:
234 case GlobalValue::WeakAnyLinkage:
235 case GlobalValue::WeakODRLinkage:
236 case GlobalValue::LinkerPrivateLinkage:
237 if (MAI->getWeakDefDirective() != 0) {
239 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
240 // .weak_definition _foo
241 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_WeakDefinition);
242 } else if (const char *LinkOnce = MAI->getLinkOnceDirective()) {
244 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
245 // FIXME: linkonce should be a section attribute, handled by COFF Section
247 // http://sourceware.org/binutils/docs-2.20/as/Linkonce.html#Linkonce
248 // .linkonce same_size
252 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Weak);
255 case GlobalValue::DLLExportLinkage:
256 case GlobalValue::AppendingLinkage:
257 // FIXME: appending linkage variables should go into a section of
258 // their name or something. For now, just emit them as external.
259 case GlobalValue::ExternalLinkage:
260 // If external or appending, declare as a global symbol.
262 OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
264 case GlobalValue::PrivateLinkage:
265 case GlobalValue::InternalLinkage:
268 llvm_unreachable("Unknown linkage type!");
271 EmitAlignment(AlignLog, GV);
273 WriteAsOperand(OutStreamer.GetCommentOS(), GV,
274 /*PrintType=*/false, GV->getParent());
275 OutStreamer.GetCommentOS() << '\n';
277 OutStreamer.EmitLabel(GVSym);
279 EmitGlobalConstant(GV->getInitializer());
281 if (MAI->hasDotTypeDotSizeDirective())
283 OutStreamer.EmitELFSize(GVSym, MCConstantExpr::Create(Size, OutContext));
285 OutStreamer.AddBlankLine();
289 bool AsmPrinter::doFinalization(Module &M) {
290 // Emit global variables.
291 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
293 EmitGlobalVariable(I);
295 // Emit final debug information.
296 if (MAI->doesSupportDebugInformation() || MAI->doesSupportExceptionHandling())
299 // If the target wants to know about weak references, print them all.
300 if (MAI->getWeakRefDirective()) {
301 // FIXME: This is not lazy, it would be nice to only print weak references
302 // to stuff that is actually used. Note that doing so would require targets
303 // to notice uses in operands (due to constant exprs etc). This should
304 // happen with the MC stuff eventually.
306 // Print out module-level global variables here.
307 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
309 if (!I->hasExternalWeakLinkage()) continue;
310 OutStreamer.EmitSymbolAttribute(GetGlobalValueSymbol(I),
314 for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I) {
315 if (!I->hasExternalWeakLinkage()) continue;
316 OutStreamer.EmitSymbolAttribute(GetGlobalValueSymbol(I),
321 if (MAI->getSetDirective()) {
322 OutStreamer.AddBlankLine();
323 for (Module::const_alias_iterator I = M.alias_begin(), E = M.alias_end();
325 MCSymbol *Name = GetGlobalValueSymbol(I);
327 const GlobalValue *GV = cast<GlobalValue>(I->getAliasedGlobal());
328 MCSymbol *Target = GetGlobalValueSymbol(GV);
330 if (I->hasExternalLinkage() || !MAI->getWeakRefDirective())
331 OutStreamer.EmitSymbolAttribute(Name, MCSA_Global);
332 else if (I->hasWeakLinkage())
333 OutStreamer.EmitSymbolAttribute(Name, MCSA_WeakReference);
335 assert(I->hasLocalLinkage() && "Invalid alias linkage");
337 printVisibility(Name, I->getVisibility());
339 O << MAI->getSetDirective() << ' ' << *Name << ", " << *Target << '\n';
343 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
344 assert(MI && "AsmPrinter didn't require GCModuleInfo?");
345 for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; )
346 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*--I))
347 MP->finishAssembly(O, *this, *MAI);
349 // If we don't have any trampolines, then we don't require stack memory
350 // to be executable. Some targets have a directive to declare this.
351 Function *InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline");
352 if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty())
353 if (MCSection *S = MAI->getNonexecutableStackSection(OutContext))
354 OutStreamer.SwitchSection(S);
356 // Allow the target to emit any magic that it wants at the end of the file,
357 // after everything else has gone out.
360 delete Mang; Mang = 0;
363 OutStreamer.Finish();
367 void AsmPrinter::SetupMachineFunction(MachineFunction &MF) {
369 // Get the function symbol.
370 CurrentFnSym = GetGlobalValueSymbol(MF.getFunction());
373 LI = &getAnalysis<MachineLoopInfo>();
377 // SectionCPs - Keep track the alignment, constpool entries per Section.
381 SmallVector<unsigned, 4> CPEs;
382 SectionCPs(const MCSection *s, unsigned a) : S(s), Alignment(a) {}
386 /// EmitConstantPool - Print to the current output stream assembly
387 /// representations of the constants in the constant pool MCP. This is
388 /// used to print out constants which have been "spilled to memory" by
389 /// the code generator.
391 void AsmPrinter::EmitConstantPool(MachineConstantPool *MCP) {
392 const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
393 if (CP.empty()) return;
395 // Calculate sections for constant pool entries. We collect entries to go into
396 // the same section together to reduce amount of section switch statements.
397 SmallVector<SectionCPs, 4> CPSections;
398 for (unsigned i = 0, e = CP.size(); i != e; ++i) {
399 const MachineConstantPoolEntry &CPE = CP[i];
400 unsigned Align = CPE.getAlignment();
403 switch (CPE.getRelocationInfo()) {
404 default: llvm_unreachable("Unknown section kind");
405 case 2: Kind = SectionKind::getReadOnlyWithRel(); break;
407 Kind = SectionKind::getReadOnlyWithRelLocal();
410 switch (TM.getTargetData()->getTypeAllocSize(CPE.getType())) {
411 case 4: Kind = SectionKind::getMergeableConst4(); break;
412 case 8: Kind = SectionKind::getMergeableConst8(); break;
413 case 16: Kind = SectionKind::getMergeableConst16();break;
414 default: Kind = SectionKind::getMergeableConst(); break;
418 const MCSection *S = getObjFileLowering().getSectionForConstant(Kind);
420 // The number of sections are small, just do a linear search from the
421 // last section to the first.
423 unsigned SecIdx = CPSections.size();
424 while (SecIdx != 0) {
425 if (CPSections[--SecIdx].S == S) {
431 SecIdx = CPSections.size();
432 CPSections.push_back(SectionCPs(S, Align));
435 if (Align > CPSections[SecIdx].Alignment)
436 CPSections[SecIdx].Alignment = Align;
437 CPSections[SecIdx].CPEs.push_back(i);
440 // Now print stuff into the calculated sections.
441 for (unsigned i = 0, e = CPSections.size(); i != e; ++i) {
442 OutStreamer.SwitchSection(CPSections[i].S);
443 EmitAlignment(Log2_32(CPSections[i].Alignment));
446 for (unsigned j = 0, ee = CPSections[i].CPEs.size(); j != ee; ++j) {
447 unsigned CPI = CPSections[i].CPEs[j];
448 MachineConstantPoolEntry CPE = CP[CPI];
450 // Emit inter-object padding for alignment.
451 unsigned AlignMask = CPE.getAlignment() - 1;
452 unsigned NewOffset = (Offset + AlignMask) & ~AlignMask;
453 OutStreamer.EmitFill(NewOffset - Offset, 0/*fillval*/, 0/*addrspace*/);
455 const Type *Ty = CPE.getType();
456 Offset = NewOffset + TM.getTargetData()->getTypeAllocSize(Ty);
458 // Emit the label with a comment on it.
460 OutStreamer.GetCommentOS() << "constant pool ";
461 WriteTypeSymbolic(OutStreamer.GetCommentOS(), CPE.getType(),
462 MF->getFunction()->getParent());
463 OutStreamer.GetCommentOS() << '\n';
465 OutStreamer.EmitLabel(GetCPISymbol(CPI));
467 if (CPE.isMachineConstantPoolEntry())
468 EmitMachineConstantPoolValue(CPE.Val.MachineCPVal);
470 EmitGlobalConstant(CPE.Val.ConstVal);
475 /// EmitJumpTableInfo - Print assembly representations of the jump tables used
476 /// by the current function to the current output stream.
478 void AsmPrinter::EmitJumpTableInfo(MachineFunction &MF) {
479 MachineJumpTableInfo *MJTI = MF.getJumpTableInfo();
480 if (MJTI == 0) return;
481 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
482 if (JT.empty()) return;
484 bool IsPic = TM.getRelocationModel() == Reloc::PIC_;
486 // Pick the directive to use to print the jump table entries, and switch to
487 // the appropriate section.
488 const Function *F = MF.getFunction();
489 bool JTInDiffSection = false;
490 if (F->isWeakForLinker() ||
491 (IsPic && !TM.getTargetLowering()->usesGlobalOffsetTable())) {
492 // In PIC mode, we need to emit the jump table to the same section as the
493 // function body itself, otherwise the label differences won't make sense.
494 // We should also do if the section name is NULL or function is declared in
495 // discardable section.
496 OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang,
499 // Otherwise, drop it in the readonly section.
500 const MCSection *ReadOnlySection =
501 getObjFileLowering().getSectionForConstant(SectionKind::getReadOnly());
502 OutStreamer.SwitchSection(ReadOnlySection);
503 JTInDiffSection = true;
506 EmitAlignment(Log2_32(MJTI->getEntryAlignment(*TM.getTargetData())));
508 for (unsigned JTI = 0, e = JT.size(); JTI != e; ++JTI) {
509 const std::vector<MachineBasicBlock*> &JTBBs = JT[JTI].MBBs;
511 // If this jump table was deleted, ignore it.
512 if (JTBBs.empty()) continue;
514 // For the EK_LabelDifference32 entry, if the target supports .set, emit a
515 // .set directive for each unique entry. This reduces the number of
516 // relocations the assembler will generate for the jump table.
517 if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_LabelDifference32 &&
518 MAI->getSetDirective()) {
519 SmallPtrSet<const MachineBasicBlock*, 16> EmittedSets;
520 const TargetLowering *TLI = TM.getTargetLowering();
521 const MCExpr *Base = TLI->getPICJumpTableRelocBaseExpr(&MF, JTI,
523 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
524 const MachineBasicBlock *MBB = JTBBs[ii];
525 if (!EmittedSets.insert(MBB)) continue;
527 O << MAI->getSetDirective() << ' '
528 << *GetJTSetSymbol(JTI, MBB->getNumber()) << ','
529 << *MBB->getSymbol(OutContext) << '-' << *Base << '\n';
533 // On some targets (e.g. Darwin) we want to emit two consequtive labels
534 // before each jump table. The first label is never referenced, but tells
535 // the assembler and linker the extents of the jump table object. The
536 // second label is actually referenced by the code.
537 if (JTInDiffSection && MAI->getLinkerPrivateGlobalPrefix()[0])
538 // FIXME: This doesn't have to have any specific name, just any randomly
539 // named and numbered 'l' label would work. Simplify GetJTISymbol.
540 OutStreamer.EmitLabel(GetJTISymbol(JTI, true));
542 OutStreamer.EmitLabel(GetJTISymbol(JTI));
544 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
545 EmitJumpTableEntry(MJTI, JTBBs[ii], JTI);
549 /// EmitJumpTableEntry - Emit a jump table entry for the specified MBB to the
551 void AsmPrinter::EmitJumpTableEntry(const MachineJumpTableInfo *MJTI,
552 const MachineBasicBlock *MBB,
553 unsigned UID) const {
554 const MCExpr *Value = 0;
555 switch (MJTI->getEntryKind()) {
556 case MachineJumpTableInfo::EK_Custom32:
557 Value = TM.getTargetLowering()->LowerCustomJumpTableEntry(MJTI, MBB, UID,
560 case MachineJumpTableInfo::EK_BlockAddress:
561 // EK_BlockAddress - Each entry is a plain address of block, e.g.:
563 Value = MCSymbolRefExpr::Create(MBB->getSymbol(OutContext), OutContext);
565 case MachineJumpTableInfo::EK_GPRel32BlockAddress: {
566 // EK_GPRel32BlockAddress - Each entry is an address of block, encoded
567 // with a relocation as gp-relative, e.g.:
569 MCSymbol *MBBSym = MBB->getSymbol(OutContext);
570 OutStreamer.EmitGPRel32Value(MCSymbolRefExpr::Create(MBBSym, OutContext));
574 case MachineJumpTableInfo::EK_LabelDifference32: {
575 // EK_LabelDifference32 - Each entry is the address of the block minus
576 // the address of the jump table. This is used for PIC jump tables where
577 // gprel32 is not supported. e.g.:
578 // .word LBB123 - LJTI1_2
579 // If the .set directive is supported, this is emitted as:
580 // .set L4_5_set_123, LBB123 - LJTI1_2
581 // .word L4_5_set_123
583 // If we have emitted set directives for the jump table entries, print
584 // them rather than the entries themselves. If we're emitting PIC, then
585 // emit the table entries as differences between two text section labels.
586 if (MAI->getSetDirective()) {
587 // If we used .set, reference the .set's symbol.
588 Value = MCSymbolRefExpr::Create(GetJTSetSymbol(UID, MBB->getNumber()),
592 // Otherwise, use the difference as the jump table entry.
593 Value = MCSymbolRefExpr::Create(MBB->getSymbol(OutContext), OutContext);
594 const MCExpr *JTI = MCSymbolRefExpr::Create(GetJTISymbol(UID), OutContext);
595 Value = MCBinaryExpr::CreateSub(Value, JTI, OutContext);
600 assert(Value && "Unknown entry kind!");
602 unsigned EntrySize = MJTI->getEntrySize(*TM.getTargetData());
603 OutStreamer.EmitValue(Value, EntrySize, /*addrspace*/0);
607 /// EmitSpecialLLVMGlobal - Check to see if the specified global is a
608 /// special global used by LLVM. If so, emit it and return true, otherwise
609 /// do nothing and return false.
610 bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
611 if (GV->getName() == "llvm.used") {
612 if (MAI->hasNoDeadStrip()) // No need to emit this at all.
613 EmitLLVMUsedList(GV->getInitializer());
617 // Ignore debug and non-emitted data. This handles llvm.compiler.used.
618 if (GV->getSection() == "llvm.metadata" ||
619 GV->hasAvailableExternallyLinkage())
622 if (!GV->hasAppendingLinkage()) return false;
624 assert(GV->hasInitializer() && "Not a special LLVM global!");
626 const TargetData *TD = TM.getTargetData();
627 unsigned Align = Log2_32(TD->getPointerPrefAlignment());
628 if (GV->getName() == "llvm.global_ctors") {
629 OutStreamer.SwitchSection(getObjFileLowering().getStaticCtorSection());
630 EmitAlignment(Align, 0);
631 EmitXXStructorList(GV->getInitializer());
633 if (TM.getRelocationModel() == Reloc::Static &&
634 MAI->hasStaticCtorDtorReferenceInStaticMode()) {
635 StringRef Sym(".constructors_used");
636 OutStreamer.EmitSymbolAttribute(OutContext.GetOrCreateSymbol(Sym),
642 if (GV->getName() == "llvm.global_dtors") {
643 OutStreamer.SwitchSection(getObjFileLowering().getStaticDtorSection());
644 EmitAlignment(Align, 0);
645 EmitXXStructorList(GV->getInitializer());
647 if (TM.getRelocationModel() == Reloc::Static &&
648 MAI->hasStaticCtorDtorReferenceInStaticMode()) {
649 StringRef Sym(".destructors_used");
650 OutStreamer.EmitSymbolAttribute(OutContext.GetOrCreateSymbol(Sym),
659 /// EmitLLVMUsedList - For targets that define a MAI::UsedDirective, mark each
660 /// global in the specified llvm.used list for which emitUsedDirectiveFor
661 /// is true, as being used with this directive.
662 void AsmPrinter::EmitLLVMUsedList(Constant *List) {
663 // Should be an array of 'i8*'.
664 ConstantArray *InitList = dyn_cast<ConstantArray>(List);
665 if (InitList == 0) return;
667 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
668 const GlobalValue *GV =
669 dyn_cast<GlobalValue>(InitList->getOperand(i)->stripPointerCasts());
670 if (GV && getObjFileLowering().shouldEmitUsedDirectiveFor(GV, Mang))
671 OutStreamer.EmitSymbolAttribute(GetGlobalValueSymbol(GV),
676 /// EmitXXStructorList - Emit the ctor or dtor list. This just prints out the
677 /// function pointers, ignoring the init priority.
678 void AsmPrinter::EmitXXStructorList(Constant *List) {
679 // Should be an array of '{ int, void ()* }' structs. The first value is the
680 // init priority, which we ignore.
681 if (!isa<ConstantArray>(List)) return;
682 ConstantArray *InitList = cast<ConstantArray>(List);
683 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
684 if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
685 if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
687 if (CS->getOperand(1)->isNullValue())
688 return; // Found a null terminator, exit printing.
689 // Emit the function pointer.
690 EmitGlobalConstant(CS->getOperand(1));
694 //===--------------------------------------------------------------------===//
695 // Emission and print routines
698 /// EmitInt8 - Emit a byte directive and value.
700 void AsmPrinter::EmitInt8(int Value) const {
701 OutStreamer.EmitIntValue(Value, 1, 0/*addrspace*/);
704 /// EmitInt16 - Emit a short directive and value.
706 void AsmPrinter::EmitInt16(int Value) const {
707 OutStreamer.EmitIntValue(Value, 2, 0/*addrspace*/);
710 /// EmitInt32 - Emit a long directive and value.
712 void AsmPrinter::EmitInt32(int Value) const {
713 OutStreamer.EmitIntValue(Value, 4, 0/*addrspace*/);
716 /// EmitInt64 - Emit a long long directive and value.
718 void AsmPrinter::EmitInt64(uint64_t Value) const {
719 OutStreamer.EmitIntValue(Value, 8, 0/*addrspace*/);
722 //===----------------------------------------------------------------------===//
724 // EmitAlignment - Emit an alignment directive to the specified power of
725 // two boundary. For example, if you pass in 3 here, you will get an 8
726 // byte alignment. If a global value is specified, and if that global has
727 // an explicit alignment requested, it will unconditionally override the
728 // alignment request. However, if ForcedAlignBits is specified, this value
729 // has final say: the ultimate alignment will be the max of ForcedAlignBits
730 // and the alignment computed with NumBits and the global.
734 // if (GV && GV->hasalignment) Align = GV->getalignment();
735 // Align = std::max(Align, ForcedAlignBits);
737 void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV,
738 unsigned ForcedAlignBits,
739 bool UseFillExpr) const {
740 if (GV && GV->getAlignment())
741 NumBits = Log2_32(GV->getAlignment());
742 NumBits = std::max(NumBits, ForcedAlignBits);
744 if (NumBits == 0) return; // No need to emit alignment.
746 unsigned FillValue = 0;
747 if (getCurrentSection()->getKind().isText())
748 FillValue = MAI->getTextAlignFillValue();
750 OutStreamer.EmitValueToAlignment(1 << NumBits, FillValue, 1, 0);
753 /// LowerConstant - Lower the specified LLVM Constant to an MCExpr.
755 static const MCExpr *LowerConstant(const Constant *CV, AsmPrinter &AP) {
756 MCContext &Ctx = AP.OutContext;
758 if (CV->isNullValue() || isa<UndefValue>(CV))
759 return MCConstantExpr::Create(0, Ctx);
761 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV))
762 return MCConstantExpr::Create(CI->getZExtValue(), Ctx);
764 if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV))
765 return MCSymbolRefExpr::Create(AP.GetGlobalValueSymbol(GV), Ctx);
766 if (const BlockAddress *BA = dyn_cast<BlockAddress>(CV))
767 return MCSymbolRefExpr::Create(AP.GetBlockAddressSymbol(BA), Ctx);
769 const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV);
771 llvm_unreachable("Unknown constant value to lower!");
772 return MCConstantExpr::Create(0, Ctx);
775 switch (CE->getOpcode()) {
776 case Instruction::ZExt:
777 case Instruction::SExt:
778 case Instruction::FPTrunc:
779 case Instruction::FPExt:
780 case Instruction::UIToFP:
781 case Instruction::SIToFP:
782 case Instruction::FPToUI:
783 case Instruction::FPToSI:
784 default: llvm_unreachable("FIXME: Don't support this constant cast expr");
785 case Instruction::GetElementPtr: {
786 const TargetData &TD = *AP.TM.getTargetData();
787 // Generate a symbolic expression for the byte address
788 const Constant *PtrVal = CE->getOperand(0);
789 SmallVector<Value*, 8> IdxVec(CE->op_begin()+1, CE->op_end());
790 int64_t Offset = TD.getIndexedOffset(PtrVal->getType(), &IdxVec[0],
793 const MCExpr *Base = LowerConstant(CE->getOperand(0), AP);
797 // Truncate/sext the offset to the pointer size.
798 if (TD.getPointerSizeInBits() != 64) {
799 int SExtAmount = 64-TD.getPointerSizeInBits();
800 Offset = (Offset << SExtAmount) >> SExtAmount;
803 return MCBinaryExpr::CreateAdd(Base, MCConstantExpr::Create(Offset, Ctx),
807 case Instruction::Trunc:
808 // We emit the value and depend on the assembler to truncate the generated
809 // expression properly. This is important for differences between
810 // blockaddress labels. Since the two labels are in the same function, it
811 // is reasonable to treat their delta as a 32-bit value.
813 case Instruction::BitCast:
814 return LowerConstant(CE->getOperand(0), AP);
816 case Instruction::IntToPtr: {
817 const TargetData &TD = *AP.TM.getTargetData();
818 // Handle casts to pointers by changing them into casts to the appropriate
819 // integer type. This promotes constant folding and simplifies this code.
820 Constant *Op = CE->getOperand(0);
821 Op = ConstantExpr::getIntegerCast(Op, TD.getIntPtrType(CV->getContext()),
823 return LowerConstant(Op, AP);
826 case Instruction::PtrToInt: {
827 const TargetData &TD = *AP.TM.getTargetData();
828 // Support only foldable casts to/from pointers that can be eliminated by
829 // changing the pointer to the appropriately sized integer type.
830 Constant *Op = CE->getOperand(0);
831 const Type *Ty = CE->getType();
833 const MCExpr *OpExpr = LowerConstant(Op, AP);
835 // We can emit the pointer value into this slot if the slot is an
836 // integer slot equal to the size of the pointer.
837 if (TD.getTypeAllocSize(Ty) == TD.getTypeAllocSize(Op->getType()))
840 // Otherwise the pointer is smaller than the resultant integer, mask off
841 // the high bits so we are sure to get a proper truncation if the input is
843 unsigned InBits = TD.getTypeAllocSizeInBits(Op->getType());
844 const MCExpr *MaskExpr = MCConstantExpr::Create(~0ULL >> (64-InBits), Ctx);
845 return MCBinaryExpr::CreateAnd(OpExpr, MaskExpr, Ctx);
848 case Instruction::Add:
849 case Instruction::Sub:
850 case Instruction::And:
851 case Instruction::Or:
852 case Instruction::Xor: {
853 const MCExpr *LHS = LowerConstant(CE->getOperand(0), AP);
854 const MCExpr *RHS = LowerConstant(CE->getOperand(1), AP);
855 switch (CE->getOpcode()) {
856 default: llvm_unreachable("Unknown binary operator constant cast expr");
857 case Instruction::Add: return MCBinaryExpr::CreateAdd(LHS, RHS, Ctx);
858 case Instruction::Sub: return MCBinaryExpr::CreateSub(LHS, RHS, Ctx);
859 case Instruction::And: return MCBinaryExpr::CreateAnd(LHS, RHS, Ctx);
860 case Instruction::Or: return MCBinaryExpr::CreateOr (LHS, RHS, Ctx);
861 case Instruction::Xor: return MCBinaryExpr::CreateXor(LHS, RHS, Ctx);
867 static void EmitGlobalConstantArray(const ConstantArray *CA, unsigned AddrSpace,
869 if (AddrSpace != 0 || !CA->isString()) {
870 // Not a string. Print the values in successive locations
871 for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i)
872 AP.EmitGlobalConstant(CA->getOperand(i), AddrSpace);
876 // Otherwise, it can be emitted as .ascii.
877 SmallVector<char, 128> TmpVec;
878 TmpVec.reserve(CA->getNumOperands());
879 for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i)
880 TmpVec.push_back(cast<ConstantInt>(CA->getOperand(i))->getZExtValue());
882 AP.OutStreamer.EmitBytes(StringRef(TmpVec.data(), TmpVec.size()), AddrSpace);
885 static void EmitGlobalConstantVector(const ConstantVector *CV,
886 unsigned AddrSpace, AsmPrinter &AP) {
887 for (unsigned i = 0, e = CV->getType()->getNumElements(); i != e; ++i)
888 AP.EmitGlobalConstant(CV->getOperand(i), AddrSpace);
891 static void EmitGlobalConstantStruct(const ConstantStruct *CS,
892 unsigned AddrSpace, AsmPrinter &AP) {
893 // Print the fields in successive locations. Pad to align if needed!
894 const TargetData *TD = AP.TM.getTargetData();
895 unsigned Size = TD->getTypeAllocSize(CS->getType());
896 const StructLayout *Layout = TD->getStructLayout(CS->getType());
897 uint64_t SizeSoFar = 0;
898 for (unsigned i = 0, e = CS->getNumOperands(); i != e; ++i) {
899 const Constant *Field = CS->getOperand(i);
901 // Check if padding is needed and insert one or more 0s.
902 uint64_t FieldSize = TD->getTypeAllocSize(Field->getType());
903 uint64_t PadSize = ((i == e-1 ? Size : Layout->getElementOffset(i+1))
904 - Layout->getElementOffset(i)) - FieldSize;
905 SizeSoFar += FieldSize + PadSize;
907 // Now print the actual field value.
908 AP.EmitGlobalConstant(Field, AddrSpace);
910 // Insert padding - this may include padding to increase the size of the
911 // current field up to the ABI size (if the struct is not packed) as well
912 // as padding to ensure that the next field starts at the right offset.
913 AP.OutStreamer.EmitZeros(PadSize, AddrSpace);
915 assert(SizeSoFar == Layout->getSizeInBytes() &&
916 "Layout of constant struct may be incorrect!");
919 static void EmitGlobalConstantFP(const ConstantFP *CFP, unsigned AddrSpace,
921 // FP Constants are printed as integer constants to avoid losing
923 if (CFP->getType()->isDoubleTy()) {
925 double Val = CFP->getValueAPF().convertToDouble();
926 AP.OutStreamer.GetCommentOS() << "double " << Val << '\n';
929 uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
930 AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace);
934 if (CFP->getType()->isFloatTy()) {
936 float Val = CFP->getValueAPF().convertToFloat();
937 AP.OutStreamer.GetCommentOS() << "float " << Val << '\n';
939 uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
940 AP.OutStreamer.EmitIntValue(Val, 4, AddrSpace);
944 if (CFP->getType()->isX86_FP80Ty()) {
945 // all long double variants are printed as hex
946 // api needed to prevent premature destruction
947 APInt API = CFP->getValueAPF().bitcastToAPInt();
948 const uint64_t *p = API.getRawData();
950 // Convert to double so we can print the approximate val as a comment.
951 APFloat DoubleVal = CFP->getValueAPF();
953 DoubleVal.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven,
955 AP.OutStreamer.GetCommentOS() << "x86_fp80 ~= "
956 << DoubleVal.convertToDouble() << '\n';
959 if (AP.TM.getTargetData()->isBigEndian()) {
960 AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace);
961 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
963 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
964 AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace);
967 // Emit the tail padding for the long double.
968 const TargetData &TD = *AP.TM.getTargetData();
969 AP.OutStreamer.EmitZeros(TD.getTypeAllocSize(CFP->getType()) -
970 TD.getTypeStoreSize(CFP->getType()), AddrSpace);
974 assert(CFP->getType()->isPPC_FP128Ty() &&
975 "Floating point constant type not handled");
976 // All long double variants are printed as hex api needed to prevent
977 // premature destruction.
978 APInt API = CFP->getValueAPF().bitcastToAPInt();
979 const uint64_t *p = API.getRawData();
980 if (AP.TM.getTargetData()->isBigEndian()) {
981 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
982 AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace);
984 AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace);
985 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
989 static void EmitGlobalConstantLargeInt(const ConstantInt *CI,
990 unsigned AddrSpace, AsmPrinter &AP) {
991 const TargetData *TD = AP.TM.getTargetData();
992 unsigned BitWidth = CI->getBitWidth();
993 assert((BitWidth & 63) == 0 && "only support multiples of 64-bits");
995 // We don't expect assemblers to support integer data directives
996 // for more than 64 bits, so we emit the data in at most 64-bit
997 // quantities at a time.
998 const uint64_t *RawData = CI->getValue().getRawData();
999 for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) {
1000 uint64_t Val = TD->isBigEndian() ? RawData[e - i - 1] : RawData[i];
1001 AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace);
1005 /// EmitGlobalConstant - Print a general LLVM constant to the .s file.
1006 void AsmPrinter::EmitGlobalConstant(const Constant *CV, unsigned AddrSpace) {
1007 if (isa<ConstantAggregateZero>(CV) || isa<UndefValue>(CV)) {
1008 uint64_t Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
1009 return OutStreamer.EmitZeros(Size, AddrSpace);
1012 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
1013 unsigned Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
1020 OutStreamer.GetCommentOS() << format("0x%llx\n", CI->getZExtValue());
1021 OutStreamer.EmitIntValue(CI->getZExtValue(), Size, AddrSpace);
1024 EmitGlobalConstantLargeInt(CI, AddrSpace, *this);
1029 if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV))
1030 return EmitGlobalConstantArray(CVA, AddrSpace, *this);
1032 if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV))
1033 return EmitGlobalConstantStruct(CVS, AddrSpace, *this);
1035 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV))
1036 return EmitGlobalConstantFP(CFP, AddrSpace, *this);
1038 if (const ConstantVector *V = dyn_cast<ConstantVector>(CV))
1039 return EmitGlobalConstantVector(V, AddrSpace, *this);
1041 if (isa<ConstantPointerNull>(CV)) {
1042 unsigned Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
1043 OutStreamer.EmitIntValue(0, Size, AddrSpace);
1047 // Otherwise, it must be a ConstantExpr. Lower it to an MCExpr, then emit it
1048 // thread the streamer with EmitValue.
1049 OutStreamer.EmitValue(LowerConstant(CV, *this),
1050 TM.getTargetData()->getTypeAllocSize(CV->getType()),
1054 void AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
1055 // Target doesn't support this yet!
1056 llvm_unreachable("Target does not support EmitMachineConstantPoolValue");
1059 /// PrintSpecial - Print information related to the specified machine instr
1060 /// that is independent of the operand, and may be independent of the instr
1061 /// itself. This can be useful for portably encoding the comment character
1062 /// or other bits of target-specific knowledge into the asmstrings. The
1063 /// syntax used is ${:comment}. Targets can override this to add support
1064 /// for their own strange codes.
1065 void AsmPrinter::PrintSpecial(const MachineInstr *MI, const char *Code) const {
1066 if (!strcmp(Code, "private")) {
1067 O << MAI->getPrivateGlobalPrefix();
1068 } else if (!strcmp(Code, "comment")) {
1070 O << MAI->getCommentString();
1071 } else if (!strcmp(Code, "uid")) {
1072 // Comparing the address of MI isn't sufficient, because machineinstrs may
1073 // be allocated to the same address across functions.
1074 const Function *ThisF = MI->getParent()->getParent()->getFunction();
1076 // If this is a new LastFn instruction, bump the counter.
1077 if (LastMI != MI || LastFn != ThisF) {
1085 raw_string_ostream Msg(msg);
1086 Msg << "Unknown special formatter '" << Code
1087 << "' for machine instr: " << *MI;
1088 llvm_report_error(Msg.str());
1092 /// processDebugLoc - Processes the debug information of each machine
1093 /// instruction's DebugLoc.
1094 void AsmPrinter::processDebugLoc(const MachineInstr *MI,
1095 bool BeforePrintingInsn) {
1096 if (!MAI || !DW || !MAI->doesSupportDebugInformation()
1097 || !DW->ShouldEmitDwarfDebug())
1099 DebugLoc DL = MI->getDebugLoc();
1102 DILocation CurDLT = MF->getDILocation(DL);
1103 if (CurDLT.getScope().isNull())
1106 if (!BeforePrintingInsn) {
1107 // After printing instruction
1109 } else if (CurDLT.getNode() != PrevDLT) {
1110 unsigned L = DW->RecordSourceLine(CurDLT.getLineNumber(),
1111 CurDLT.getColumnNumber(),
1112 CurDLT.getScope().getNode());
1115 DW->BeginScope(MI, L);
1116 PrevDLT = CurDLT.getNode();
1121 /// printInlineAsm - This method formats and prints the specified machine
1122 /// instruction that is an inline asm.
1123 void AsmPrinter::printInlineAsm(const MachineInstr *MI) const {
1124 unsigned NumOperands = MI->getNumOperands();
1126 // Count the number of register definitions.
1127 unsigned NumDefs = 0;
1128 for (; MI->getOperand(NumDefs).isReg() && MI->getOperand(NumDefs).isDef();
1130 assert(NumDefs != NumOperands-1 && "No asm string?");
1132 assert(MI->getOperand(NumDefs).isSymbol() && "No asm string?");
1134 // Disassemble the AsmStr, printing out the literal pieces, the operands, etc.
1135 const char *AsmStr = MI->getOperand(NumDefs).getSymbolName();
1139 // If this asmstr is empty, just print the #APP/#NOAPP markers.
1140 // These are useful to see where empty asm's wound up.
1141 if (AsmStr[0] == 0) {
1142 O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t";
1143 O << MAI->getCommentString() << MAI->getInlineAsmEnd() << '\n';
1147 O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t";
1149 // The variant of the current asmprinter.
1150 int AsmPrinterVariant = MAI->getAssemblerDialect();
1152 int CurVariant = -1; // The number of the {.|.|.} region we are in.
1153 const char *LastEmitted = AsmStr; // One past the last character emitted.
1155 while (*LastEmitted) {
1156 switch (*LastEmitted) {
1158 // Not a special case, emit the string section literally.
1159 const char *LiteralEnd = LastEmitted+1;
1160 while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' &&
1161 *LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n')
1163 if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1164 O.write(LastEmitted, LiteralEnd-LastEmitted);
1165 LastEmitted = LiteralEnd;
1169 ++LastEmitted; // Consume newline character.
1170 O << '\n'; // Indent code with newline.
1173 ++LastEmitted; // Consume '$' character.
1177 switch (*LastEmitted) {
1178 default: Done = false; break;
1179 case '$': // $$ -> $
1180 if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1182 ++LastEmitted; // Consume second '$' character.
1184 case '(': // $( -> same as GCC's { character.
1185 ++LastEmitted; // Consume '(' character.
1186 if (CurVariant != -1) {
1187 llvm_report_error("Nested variants found in inline asm string: '"
1188 + std::string(AsmStr) + "'");
1190 CurVariant = 0; // We're in the first variant now.
1193 ++LastEmitted; // consume '|' character.
1194 if (CurVariant == -1)
1195 O << '|'; // this is gcc's behavior for | outside a variant
1197 ++CurVariant; // We're in the next variant.
1199 case ')': // $) -> same as GCC's } char.
1200 ++LastEmitted; // consume ')' character.
1201 if (CurVariant == -1)
1202 O << '}'; // this is gcc's behavior for } outside a variant
1209 bool HasCurlyBraces = false;
1210 if (*LastEmitted == '{') { // ${variable}
1211 ++LastEmitted; // Consume '{' character.
1212 HasCurlyBraces = true;
1215 // If we have ${:foo}, then this is not a real operand reference, it is a
1216 // "magic" string reference, just like in .td files. Arrange to call
1218 if (HasCurlyBraces && *LastEmitted == ':') {
1220 const char *StrStart = LastEmitted;
1221 const char *StrEnd = strchr(StrStart, '}');
1223 llvm_report_error("Unterminated ${:foo} operand in inline asm string: '"
1224 + std::string(AsmStr) + "'");
1227 std::string Val(StrStart, StrEnd);
1228 PrintSpecial(MI, Val.c_str());
1229 LastEmitted = StrEnd+1;
1233 const char *IDStart = LastEmitted;
1236 long Val = strtol(IDStart, &IDEnd, 10); // We only accept numbers for IDs.
1237 if (!isdigit(*IDStart) || (Val == 0 && errno == EINVAL)) {
1238 llvm_report_error("Bad $ operand number in inline asm string: '"
1239 + std::string(AsmStr) + "'");
1241 LastEmitted = IDEnd;
1243 char Modifier[2] = { 0, 0 };
1245 if (HasCurlyBraces) {
1246 // If we have curly braces, check for a modifier character. This
1247 // supports syntax like ${0:u}, which correspond to "%u0" in GCC asm.
1248 if (*LastEmitted == ':') {
1249 ++LastEmitted; // Consume ':' character.
1250 if (*LastEmitted == 0) {
1251 llvm_report_error("Bad ${:} expression in inline asm string: '"
1252 + std::string(AsmStr) + "'");
1255 Modifier[0] = *LastEmitted;
1256 ++LastEmitted; // Consume modifier character.
1259 if (*LastEmitted != '}') {
1260 llvm_report_error("Bad ${} expression in inline asm string: '"
1261 + std::string(AsmStr) + "'");
1263 ++LastEmitted; // Consume '}' character.
1266 if ((unsigned)Val >= NumOperands-1) {
1267 llvm_report_error("Invalid $ operand number in inline asm string: '"
1268 + std::string(AsmStr) + "'");
1271 // Okay, we finally have a value number. Ask the target to print this
1273 if (CurVariant == -1 || CurVariant == AsmPrinterVariant) {
1278 // Scan to find the machine operand number for the operand.
1279 for (; Val; --Val) {
1280 if (OpNo >= MI->getNumOperands()) break;
1281 unsigned OpFlags = MI->getOperand(OpNo).getImm();
1282 OpNo += InlineAsm::getNumOperandRegisters(OpFlags) + 1;
1285 if (OpNo >= MI->getNumOperands()) {
1288 unsigned OpFlags = MI->getOperand(OpNo).getImm();
1289 ++OpNo; // Skip over the ID number.
1291 if (Modifier[0] == 'l') // labels are target independent
1292 O << *MI->getOperand(OpNo).getMBB()->getSymbol(OutContext);
1294 AsmPrinter *AP = const_cast<AsmPrinter*>(this);
1295 if ((OpFlags & 7) == 4) {
1296 Error = AP->PrintAsmMemoryOperand(MI, OpNo, AsmPrinterVariant,
1297 Modifier[0] ? Modifier : 0);
1299 Error = AP->PrintAsmOperand(MI, OpNo, AsmPrinterVariant,
1300 Modifier[0] ? Modifier : 0);
1306 raw_string_ostream Msg(msg);
1307 Msg << "Invalid operand found in inline asm: '" << AsmStr << "'\n";
1309 llvm_report_error(Msg.str());
1316 O << "\n\t" << MAI->getCommentString() << MAI->getInlineAsmEnd();
1319 /// printImplicitDef - This method prints the specified machine instruction
1320 /// that is an implicit def.
1321 void AsmPrinter::printImplicitDef(const MachineInstr *MI) const {
1322 if (!VerboseAsm) return;
1323 O.PadToColumn(MAI->getCommentColumn());
1324 O << MAI->getCommentString() << " implicit-def: "
1325 << TRI->getName(MI->getOperand(0).getReg());
1328 void AsmPrinter::printKill(const MachineInstr *MI) const {
1329 if (!VerboseAsm) return;
1330 O.PadToColumn(MAI->getCommentColumn());
1331 O << MAI->getCommentString() << " kill:";
1332 for (unsigned n = 0, e = MI->getNumOperands(); n != e; ++n) {
1333 const MachineOperand &op = MI->getOperand(n);
1334 assert(op.isReg() && "KILL instruction must have only register operands");
1335 O << ' ' << TRI->getName(op.getReg()) << (op.isDef() ? "<def>" : "<kill>");
1339 /// printLabel - This method prints a local label used by debug and
1340 /// exception handling tables.
1341 void AsmPrinter::printLabel(const MachineInstr *MI) const {
1342 printLabel(MI->getOperand(0).getImm());
1345 void AsmPrinter::printLabel(unsigned Id) const {
1346 O << MAI->getPrivateGlobalPrefix() << "label" << Id << ':';
1349 /// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
1350 /// instruction, using the specified assembler variant. Targets should
1351 /// override this to format as appropriate.
1352 bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
1353 unsigned AsmVariant, const char *ExtraCode) {
1354 // Target doesn't support this yet!
1358 bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
1359 unsigned AsmVariant,
1360 const char *ExtraCode) {
1361 // Target doesn't support this yet!
1365 MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BlockAddress *BA,
1366 const char *Suffix) const {
1367 return GetBlockAddressSymbol(BA->getFunction(), BA->getBasicBlock(), Suffix);
1370 MCSymbol *AsmPrinter::GetBlockAddressSymbol(const Function *F,
1371 const BasicBlock *BB,
1372 const char *Suffix) const {
1373 assert(BB->hasName() &&
1374 "Address of anonymous basic block not supported yet!");
1376 // This code must use the function name itself, and not the function number,
1377 // since it must be possible to generate the label name from within other
1379 SmallString<60> FnName;
1380 Mang->getNameWithPrefix(FnName, F, false);
1382 // FIXME: THIS IS BROKEN IF THE LLVM BASIC BLOCK DOESN'T HAVE A NAME!
1383 SmallString<60> NameResult;
1384 Mang->getNameWithPrefix(NameResult,
1385 StringRef("BA") + Twine((unsigned)FnName.size()) +
1386 "_" + FnName.str() + "_" + BB->getName() + Suffix,
1389 return OutContext.GetOrCreateSymbol(NameResult.str());
1392 /// GetCPISymbol - Return the symbol for the specified constant pool entry.
1393 MCSymbol *AsmPrinter::GetCPISymbol(unsigned CPID) const {
1394 SmallString<60> Name;
1395 raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "CPI"
1396 << getFunctionNumber() << '_' << CPID;
1397 return OutContext.GetOrCreateSymbol(Name.str());
1400 /// GetJTISymbol - Return the symbol for the specified jump table entry.
1401 MCSymbol *AsmPrinter::GetJTISymbol(unsigned JTID, bool isLinkerPrivate) const {
1402 return MF->getJTISymbol(JTID, OutContext, isLinkerPrivate);
1405 /// GetJTSetSymbol - Return the symbol for the specified jump table .set
1406 /// FIXME: privatize to AsmPrinter.
1407 MCSymbol *AsmPrinter::GetJTSetSymbol(unsigned UID, unsigned MBBID) const {
1408 SmallString<60> Name;
1409 raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix()
1410 << getFunctionNumber() << '_' << UID << "_set_" << MBBID;
1411 return OutContext.GetOrCreateSymbol(Name.str());
1414 /// GetGlobalValueSymbol - Return the MCSymbol for the specified global
1416 MCSymbol *AsmPrinter::GetGlobalValueSymbol(const GlobalValue *GV) const {
1417 SmallString<60> NameStr;
1418 Mang->getNameWithPrefix(NameStr, GV, false);
1419 return OutContext.GetOrCreateSymbol(NameStr.str());
1422 /// GetSymbolWithGlobalValueBase - Return the MCSymbol for a symbol with
1423 /// global value name as its base, with the specified suffix, and where the
1424 /// symbol is forced to have private linkage if ForcePrivate is true.
1425 MCSymbol *AsmPrinter::GetSymbolWithGlobalValueBase(const GlobalValue *GV,
1427 bool ForcePrivate) const {
1428 SmallString<60> NameStr;
1429 Mang->getNameWithPrefix(NameStr, GV, ForcePrivate);
1430 NameStr.append(Suffix.begin(), Suffix.end());
1431 return OutContext.GetOrCreateSymbol(NameStr.str());
1434 /// GetExternalSymbolSymbol - Return the MCSymbol for the specified
1436 MCSymbol *AsmPrinter::GetExternalSymbolSymbol(StringRef Sym) const {
1437 SmallString<60> NameStr;
1438 Mang->getNameWithPrefix(NameStr, Sym);
1439 return OutContext.GetOrCreateSymbol(NameStr.str());
1444 /// PrintParentLoopComment - Print comments about parent loops of this one.
1445 static void PrintParentLoopComment(raw_ostream &OS, const MachineLoop *Loop,
1446 unsigned FunctionNumber) {
1447 if (Loop == 0) return;
1448 PrintParentLoopComment(OS, Loop->getParentLoop(), FunctionNumber);
1449 OS.indent(Loop->getLoopDepth()*2)
1450 << "Parent Loop BB" << FunctionNumber << "_"
1451 << Loop->getHeader()->getNumber()
1452 << " Depth=" << Loop->getLoopDepth() << '\n';
1456 /// PrintChildLoopComment - Print comments about child loops within
1457 /// the loop for this basic block, with nesting.
1458 static void PrintChildLoopComment(raw_ostream &OS, const MachineLoop *Loop,
1459 unsigned FunctionNumber) {
1460 // Add child loop information
1461 for (MachineLoop::iterator CL = Loop->begin(), E = Loop->end();CL != E; ++CL){
1462 OS.indent((*CL)->getLoopDepth()*2)
1463 << "Child Loop BB" << FunctionNumber << "_"
1464 << (*CL)->getHeader()->getNumber() << " Depth " << (*CL)->getLoopDepth()
1466 PrintChildLoopComment(OS, *CL, FunctionNumber);
1470 /// EmitComments - Pretty-print comments for basic blocks.
1471 static void PrintBasicBlockLoopComments(const MachineBasicBlock &MBB,
1472 const MachineLoopInfo *LI,
1473 const AsmPrinter &AP) {
1474 // Add loop depth information
1475 const MachineLoop *Loop = LI->getLoopFor(&MBB);
1476 if (Loop == 0) return;
1478 MachineBasicBlock *Header = Loop->getHeader();
1479 assert(Header && "No header for loop");
1481 // If this block is not a loop header, just print out what is the loop header
1483 if (Header != &MBB) {
1484 AP.OutStreamer.AddComment(" in Loop: Header=BB" +
1485 Twine(AP.getFunctionNumber())+"_" +
1486 Twine(Loop->getHeader()->getNumber())+
1487 " Depth="+Twine(Loop->getLoopDepth()));
1491 // Otherwise, it is a loop header. Print out information about child and
1493 raw_ostream &OS = AP.OutStreamer.GetCommentOS();
1495 PrintParentLoopComment(OS, Loop->getParentLoop(), AP.getFunctionNumber());
1498 OS.indent(Loop->getLoopDepth()*2-2);
1503 OS << "Loop Header: Depth=" + Twine(Loop->getLoopDepth()) << '\n';
1505 PrintChildLoopComment(OS, Loop, AP.getFunctionNumber());
1509 /// EmitBasicBlockStart - This method prints the label for the specified
1510 /// MachineBasicBlock, an alignment (if present) and a comment describing
1511 /// it if appropriate.
1512 void AsmPrinter::EmitBasicBlockStart(const MachineBasicBlock *MBB) const {
1513 // Emit an alignment directive for this block, if needed.
1514 if (unsigned Align = MBB->getAlignment())
1515 EmitAlignment(Log2_32(Align));
1517 // If the block has its address taken, emit a special label to satisfy
1518 // references to the block. This is done so that we don't need to
1519 // remember the number of this label, and so that we can make
1520 // forward references to labels without knowing what their numbers
1522 if (MBB->hasAddressTaken()) {
1523 const BasicBlock *BB = MBB->getBasicBlock();
1525 OutStreamer.AddComment("Address Taken");
1526 OutStreamer.EmitLabel(GetBlockAddressSymbol(BB->getParent(), BB));
1529 // Print the main label for the block.
1530 if (MBB->pred_empty() || MBB->isOnlyReachableByFallthrough()) {
1532 // NOTE: Want this comment at start of line.
1533 O << MAI->getCommentString() << " BB#" << MBB->getNumber() << ':';
1534 if (const BasicBlock *BB = MBB->getBasicBlock())
1536 OutStreamer.AddComment("%" + BB->getName());
1538 PrintBasicBlockLoopComments(*MBB, LI, *this);
1539 OutStreamer.AddBlankLine();
1543 if (const BasicBlock *BB = MBB->getBasicBlock())
1545 OutStreamer.AddComment("%" + BB->getName());
1546 PrintBasicBlockLoopComments(*MBB, LI, *this);
1549 OutStreamer.EmitLabel(MBB->getSymbol(OutContext));
1553 void AsmPrinter::printVisibility(MCSymbol *Sym, unsigned Visibility) const {
1554 MCSymbolAttr Attr = MCSA_Invalid;
1556 switch (Visibility) {
1558 case GlobalValue::HiddenVisibility:
1559 Attr = MAI->getHiddenVisibilityAttr();
1561 case GlobalValue::ProtectedVisibility:
1562 Attr = MAI->getProtectedVisibilityAttr();
1566 if (Attr != MCSA_Invalid)
1567 OutStreamer.EmitSymbolAttribute(Sym, Attr);
1570 void AsmPrinter::printOffset(int64_t Offset) const {
1573 else if (Offset < 0)
1577 GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy *S) {
1578 if (!S->usesMetadata())
1581 gcp_iterator GCPI = GCMetadataPrinters.find(S);
1582 if (GCPI != GCMetadataPrinters.end())
1583 return GCPI->second;
1585 const char *Name = S->getName().c_str();
1587 for (GCMetadataPrinterRegistry::iterator
1588 I = GCMetadataPrinterRegistry::begin(),
1589 E = GCMetadataPrinterRegistry::end(); I != E; ++I)
1590 if (strcmp(Name, I->getName()) == 0) {
1591 GCMetadataPrinter *GMP = I->instantiate();
1593 GCMetadataPrinters.insert(std::make_pair(S, GMP));
1597 llvm_report_error("no GCMetadataPrinter registered for GC: " + Twine(Name));
1601 /// EmitComments - Pretty-print comments for instructions
1602 void AsmPrinter::EmitComments(const MachineInstr &MI) const {
1606 bool Newline = false;
1608 if (!MI.getDebugLoc().isUnknown()) {
1609 DILocation DLT = MF->getDILocation(MI.getDebugLoc());
1611 // Print source line info.
1612 O.PadToColumn(MAI->getCommentColumn());
1613 O << MAI->getCommentString() << ' ';
1614 DIScope Scope = DLT.getScope();
1615 // Omit the directory, because it's likely to be long and uninteresting.
1616 if (!Scope.isNull())
1617 O << Scope.getFilename();
1620 O << ':' << DLT.getLineNumber();
1621 if (DLT.getColumnNumber() != 0)
1622 O << ':' << DLT.getColumnNumber();
1626 // Check for spills and reloads
1629 const MachineFrameInfo *FrameInfo =
1630 MI.getParent()->getParent()->getFrameInfo();
1632 // We assume a single instruction only has a spill or reload, not
1634 const MachineMemOperand *MMO;
1635 if (TM.getInstrInfo()->isLoadFromStackSlotPostFE(&MI, FI)) {
1636 if (FrameInfo->isSpillSlotObjectIndex(FI)) {
1637 MMO = *MI.memoperands_begin();
1638 if (Newline) O << '\n';
1639 O.PadToColumn(MAI->getCommentColumn());
1640 O << MAI->getCommentString() << ' ' << MMO->getSize() << "-byte Reload";
1644 else if (TM.getInstrInfo()->hasLoadFromStackSlot(&MI, MMO, FI)) {
1645 if (FrameInfo->isSpillSlotObjectIndex(FI)) {
1646 if (Newline) O << '\n';
1647 O.PadToColumn(MAI->getCommentColumn());
1648 O << MAI->getCommentString() << ' '
1649 << MMO->getSize() << "-byte Folded Reload";
1653 else if (TM.getInstrInfo()->isStoreToStackSlotPostFE(&MI, FI)) {
1654 if (FrameInfo->isSpillSlotObjectIndex(FI)) {
1655 MMO = *MI.memoperands_begin();
1656 if (Newline) O << '\n';
1657 O.PadToColumn(MAI->getCommentColumn());
1658 O << MAI->getCommentString() << ' ' << MMO->getSize() << "-byte Spill";
1662 else if (TM.getInstrInfo()->hasStoreToStackSlot(&MI, MMO, FI)) {
1663 if (FrameInfo->isSpillSlotObjectIndex(FI)) {
1664 if (Newline) O << '\n';
1665 O.PadToColumn(MAI->getCommentColumn());
1666 O << MAI->getCommentString() << ' '
1667 << MMO->getSize() << "-byte Folded Spill";
1672 // Check for spill-induced copies
1673 unsigned SrcReg, DstReg, SrcSubIdx, DstSubIdx;
1674 if (TM.getInstrInfo()->isMoveInstr(MI, SrcReg, DstReg,
1675 SrcSubIdx, DstSubIdx)) {
1676 if (MI.getAsmPrinterFlag(ReloadReuse)) {
1677 if (Newline) O << '\n';
1678 O.PadToColumn(MAI->getCommentColumn());
1679 O << MAI->getCommentString() << " Reload Reuse";