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/MCInst.h"
30 #include "llvm/MC/MCSection.h"
31 #include "llvm/MC/MCStreamer.h"
32 #include "llvm/MC/MCSymbol.h"
33 #include "llvm/Support/CommandLine.h"
34 #include "llvm/Support/ErrorHandling.h"
35 #include "llvm/Support/Format.h"
36 #include "llvm/Support/FormattedStream.h"
37 #include "llvm/MC/MCAsmInfo.h"
38 #include "llvm/Target/Mangler.h"
39 #include "llvm/Target/TargetData.h"
40 #include "llvm/Target/TargetInstrInfo.h"
41 #include "llvm/Target/TargetLowering.h"
42 #include "llvm/Target/TargetLoweringObjectFile.h"
43 #include "llvm/Target/TargetOptions.h"
44 #include "llvm/Target/TargetRegisterInfo.h"
45 #include "llvm/ADT/SmallPtrSet.h"
46 #include "llvm/ADT/SmallString.h"
50 static cl::opt<cl::boolOrDefault>
51 AsmVerbose("asm-verbose", cl::desc("Add comments to directives."),
52 cl::init(cl::BOU_UNSET));
54 static bool getVerboseAsm(bool VDef) {
57 case cl::BOU_UNSET: return VDef;
58 case cl::BOU_TRUE: return true;
59 case cl::BOU_FALSE: return false;
63 char AsmPrinter::ID = 0;
64 AsmPrinter::AsmPrinter(formatted_raw_ostream &o, TargetMachine &tm,
65 const MCAsmInfo *T, bool VDef)
66 : MachineFunctionPass(&ID), FunctionNumber(0), O(o),
67 TM(tm), MAI(T), TRI(tm.getRegisterInfo()),
69 OutContext(*new MCContext()),
70 // FIXME: Pass instprinter to streamer.
71 OutStreamer(*createAsmStreamer(OutContext, O, *T,
72 TM.getTargetData()->isLittleEndian(),
73 getVerboseAsm(VDef), 0)),
75 LastMI(0), LastFn(0), Counter(~0U), PrevDLT(NULL) {
77 VerboseAsm = getVerboseAsm(VDef);
80 AsmPrinter::~AsmPrinter() {
81 for (gcp_iterator I = GCMetadataPrinters.begin(),
82 E = GCMetadataPrinters.end(); I != E; ++I)
89 TargetLoweringObjectFile &AsmPrinter::getObjFileLowering() const {
90 return TM.getTargetLowering()->getObjFileLowering();
93 /// getCurrentSection() - Return the current section we are emitting to.
94 const MCSection *AsmPrinter::getCurrentSection() const {
95 return OutStreamer.getCurrentSection();
99 void AsmPrinter::getAnalysisUsage(AnalysisUsage &AU) const {
100 AU.setPreservesAll();
101 MachineFunctionPass::getAnalysisUsage(AU);
102 AU.addRequired<GCModuleInfo>();
104 AU.addRequired<MachineLoopInfo>();
107 bool AsmPrinter::doInitialization(Module &M) {
108 // Initialize TargetLoweringObjectFile.
109 const_cast<TargetLoweringObjectFile&>(getObjFileLowering())
110 .Initialize(OutContext, TM);
112 Mang = new Mangler(*MAI);
114 // Allow the target to emit any magic that it wants at the start of the file.
115 EmitStartOfAsmFile(M);
117 if (MAI->hasSingleParameterDotFile()) {
118 /* Very minimal debug info. It is ignored if we emit actual
119 debug info. If we don't, this at least helps the user find where
120 a function came from. */
121 O << "\t.file\t\"" << M.getModuleIdentifier() << "\"\n";
124 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
125 assert(MI && "AsmPrinter didn't require GCModuleInfo?");
126 for (GCModuleInfo::iterator I = MI->begin(), E = MI->end(); I != E; ++I)
127 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I))
128 MP->beginAssembly(O, *this, *MAI);
130 if (!M.getModuleInlineAsm().empty())
131 O << MAI->getCommentString() << " Start of file scope inline assembly\n"
132 << M.getModuleInlineAsm()
133 << '\n' << MAI->getCommentString()
134 << " End of file scope inline assembly\n";
136 MMI = getAnalysisIfAvailable<MachineModuleInfo>();
138 MMI->AnalyzeModule(M);
139 DW = getAnalysisIfAvailable<DwarfWriter>();
141 DW->BeginModule(&M, MMI, O, this, MAI);
146 /// EmitGlobalVariable - Emit the specified global variable to the .s file.
147 void AsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) {
148 if (!GV->hasInitializer()) // External globals require no code.
151 // Check to see if this is a special global used by LLVM, if so, emit it.
152 if (EmitSpecialLLVMGlobal(GV))
155 MCSymbol *GVSym = GetGlobalValueSymbol(GV);
156 printVisibility(GVSym, GV->getVisibility());
158 if (MAI->hasDotTypeDotSizeDirective()) {
159 O << "\t.type\t" << *GVSym;
160 if (MAI->getCommentString()[0] != '@')
166 SectionKind GVKind = TargetLoweringObjectFile::getKindForGlobal(GV, TM);
168 const TargetData *TD = TM.getTargetData();
169 unsigned Size = TD->getTypeAllocSize(GV->getType()->getElementType());
170 unsigned AlignLog = TD->getPreferredAlignmentLog(GV);
172 // Handle common and BSS local symbols (.lcomm).
173 if (GVKind.isCommon() || GVKind.isBSSLocal()) {
174 if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
177 WriteAsOperand(OutStreamer.GetCommentOS(), GV,
178 /*PrintType=*/false, GV->getParent());
179 OutStreamer.GetCommentOS() << '\n';
182 // Handle common symbols.
183 if (GVKind.isCommon()) {
185 OutStreamer.EmitCommonSymbol(GVSym, Size, 1 << AlignLog);
189 // Handle local BSS symbols.
190 if (MAI->hasMachoZeroFillDirective()) {
191 const MCSection *TheSection =
192 getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM);
193 // .zerofill __DATA, __bss, _foo, 400, 5
194 OutStreamer.EmitZerofill(TheSection, GVSym, Size, 1 << AlignLog);
198 if (const char *LComm = MAI->getLCOMMDirective()) {
200 O << LComm << *GVSym << ',' << Size;
206 O << "\t.local\t" << *GVSym << '\n';
208 OutStreamer.EmitCommonSymbol(GVSym, Size, 1 << AlignLog);
212 const MCSection *TheSection =
213 getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM);
215 // Handle the zerofill directive on darwin, which is a special form of BSS
217 if (GVKind.isBSSExtern() && MAI->hasMachoZeroFillDirective()) {
219 OutStreamer.EmitSymbolAttribute(GVSym, MCStreamer::Global);
220 // .zerofill __DATA, __common, _foo, 400, 5
221 OutStreamer.EmitZerofill(TheSection, GVSym, Size, 1 << AlignLog);
225 OutStreamer.SwitchSection(TheSection);
227 // TODO: Factor into an 'emit linkage' thing that is shared with function
229 switch (GV->getLinkage()) {
230 case GlobalValue::CommonLinkage:
231 case GlobalValue::LinkOnceAnyLinkage:
232 case GlobalValue::LinkOnceODRLinkage:
233 case GlobalValue::WeakAnyLinkage:
234 case GlobalValue::WeakODRLinkage:
235 case GlobalValue::LinkerPrivateLinkage:
236 if (MAI->getWeakDefDirective() != 0) {
238 OutStreamer.EmitSymbolAttribute(GVSym, MCStreamer::Global);
239 // .weak_definition _foo
240 OutStreamer.EmitSymbolAttribute(GVSym, MCStreamer::WeakDefinition);
241 } else if (const char *LinkOnce = MAI->getLinkOnceDirective()) {
243 OutStreamer.EmitSymbolAttribute(GVSym, MCStreamer::Global);
244 // .linkonce same_size
248 OutStreamer.EmitSymbolAttribute(GVSym, MCStreamer::Weak);
251 case GlobalValue::DLLExportLinkage:
252 case GlobalValue::AppendingLinkage:
253 // FIXME: appending linkage variables should go into a section of
254 // their name or something. For now, just emit them as external.
255 case GlobalValue::ExternalLinkage:
256 // If external or appending, declare as a global symbol.
258 OutStreamer.EmitSymbolAttribute(GVSym, MCStreamer::Global);
260 case GlobalValue::PrivateLinkage:
261 case GlobalValue::InternalLinkage:
264 llvm_unreachable("Unknown linkage type!");
267 EmitAlignment(AlignLog, GV);
269 WriteAsOperand(OutStreamer.GetCommentOS(), GV,
270 /*PrintType=*/false, GV->getParent());
271 OutStreamer.GetCommentOS() << '\n';
273 OutStreamer.EmitLabel(GVSym);
275 EmitGlobalConstant(GV->getInitializer());
277 if (MAI->hasDotTypeDotSizeDirective())
278 O << "\t.size\t" << *GVSym << ", " << Size << '\n';
280 OutStreamer.AddBlankLine();
284 bool AsmPrinter::doFinalization(Module &M) {
285 // Emit global variables.
286 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
288 EmitGlobalVariable(I);
290 // Emit final debug information.
291 if (MAI->doesSupportDebugInformation() || MAI->doesSupportExceptionHandling())
294 // If the target wants to know about weak references, print them all.
295 if (MAI->getWeakRefDirective()) {
296 // FIXME: This is not lazy, it would be nice to only print weak references
297 // to stuff that is actually used. Note that doing so would require targets
298 // to notice uses in operands (due to constant exprs etc). This should
299 // happen with the MC stuff eventually.
301 // Print out module-level global variables here.
302 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
304 if (!I->hasExternalWeakLinkage()) continue;
305 O << MAI->getWeakRefDirective() << *GetGlobalValueSymbol(I) << '\n';
308 for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I) {
309 if (!I->hasExternalWeakLinkage()) continue;
310 O << MAI->getWeakRefDirective() << *GetGlobalValueSymbol(I) << '\n';
314 if (MAI->getSetDirective()) {
316 for (Module::const_alias_iterator I = M.alias_begin(), E = M.alias_end();
318 MCSymbol *Name = GetGlobalValueSymbol(I);
320 const GlobalValue *GV = cast<GlobalValue>(I->getAliasedGlobal());
321 MCSymbol *Target = GetGlobalValueSymbol(GV);
323 if (I->hasExternalLinkage() || !MAI->getWeakRefDirective())
324 O << "\t.globl\t" << *Name << '\n';
325 else if (I->hasWeakLinkage())
326 O << MAI->getWeakRefDirective() << *Name << '\n';
328 assert(I->hasLocalLinkage() && "Invalid alias linkage");
330 printVisibility(Name, I->getVisibility());
332 O << MAI->getSetDirective() << ' ' << *Name << ", " << *Target << '\n';
336 GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
337 assert(MI && "AsmPrinter didn't require GCModuleInfo?");
338 for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; )
339 if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*--I))
340 MP->finishAssembly(O, *this, *MAI);
342 // If we don't have any trampolines, then we don't require stack memory
343 // to be executable. Some targets have a directive to declare this.
344 Function *InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline");
345 if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty())
346 if (MAI->getNonexecutableStackDirective())
347 O << MAI->getNonexecutableStackDirective() << '\n';
350 // Allow the target to emit any magic that it wants at the end of the file,
351 // after everything else has gone out.
354 delete Mang; Mang = 0;
357 OutStreamer.Finish();
361 void AsmPrinter::SetupMachineFunction(MachineFunction &MF) {
362 // Get the function symbol.
363 CurrentFnSym = GetGlobalValueSymbol(MF.getFunction());
364 IncrementFunctionNumber();
367 LI = &getAnalysis<MachineLoopInfo>();
371 // SectionCPs - Keep track the alignment, constpool entries per Section.
375 SmallVector<unsigned, 4> CPEs;
376 SectionCPs(const MCSection *s, unsigned a) : S(s), Alignment(a) {}
380 /// EmitConstantPool - Print to the current output stream assembly
381 /// representations of the constants in the constant pool MCP. This is
382 /// used to print out constants which have been "spilled to memory" by
383 /// the code generator.
385 void AsmPrinter::EmitConstantPool(MachineConstantPool *MCP) {
386 const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
387 if (CP.empty()) return;
389 // Calculate sections for constant pool entries. We collect entries to go into
390 // the same section together to reduce amount of section switch statements.
391 SmallVector<SectionCPs, 4> CPSections;
392 for (unsigned i = 0, e = CP.size(); i != e; ++i) {
393 const MachineConstantPoolEntry &CPE = CP[i];
394 unsigned Align = CPE.getAlignment();
397 switch (CPE.getRelocationInfo()) {
398 default: llvm_unreachable("Unknown section kind");
399 case 2: Kind = SectionKind::getReadOnlyWithRel(); break;
401 Kind = SectionKind::getReadOnlyWithRelLocal();
404 switch (TM.getTargetData()->getTypeAllocSize(CPE.getType())) {
405 case 4: Kind = SectionKind::getMergeableConst4(); break;
406 case 8: Kind = SectionKind::getMergeableConst8(); break;
407 case 16: Kind = SectionKind::getMergeableConst16();break;
408 default: Kind = SectionKind::getMergeableConst(); break;
412 const MCSection *S = getObjFileLowering().getSectionForConstant(Kind);
414 // The number of sections are small, just do a linear search from the
415 // last section to the first.
417 unsigned SecIdx = CPSections.size();
418 while (SecIdx != 0) {
419 if (CPSections[--SecIdx].S == S) {
425 SecIdx = CPSections.size();
426 CPSections.push_back(SectionCPs(S, Align));
429 if (Align > CPSections[SecIdx].Alignment)
430 CPSections[SecIdx].Alignment = Align;
431 CPSections[SecIdx].CPEs.push_back(i);
434 // Now print stuff into the calculated sections.
435 for (unsigned i = 0, e = CPSections.size(); i != e; ++i) {
436 OutStreamer.SwitchSection(CPSections[i].S);
437 EmitAlignment(Log2_32(CPSections[i].Alignment));
440 for (unsigned j = 0, ee = CPSections[i].CPEs.size(); j != ee; ++j) {
441 unsigned CPI = CPSections[i].CPEs[j];
442 MachineConstantPoolEntry CPE = CP[CPI];
444 // Emit inter-object padding for alignment.
445 unsigned AlignMask = CPE.getAlignment() - 1;
446 unsigned NewOffset = (Offset + AlignMask) & ~AlignMask;
447 OutStreamer.EmitFill(NewOffset - Offset, 0/*fillval*/, 0/*addrspace*/);
449 const Type *Ty = CPE.getType();
450 Offset = NewOffset + TM.getTargetData()->getTypeAllocSize(Ty);
452 O << MAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
455 O.PadToColumn(MAI->getCommentColumn());
456 O << MAI->getCommentString() << " constant ";
457 WriteTypeSymbolic(O, CPE.getType(), MF->getFunction()->getParent());
460 if (CPE.isMachineConstantPoolEntry())
461 EmitMachineConstantPoolValue(CPE.Val.MachineCPVal);
463 EmitGlobalConstant(CPE.Val.ConstVal);
468 /// EmitJumpTableInfo - Print assembly representations of the jump tables used
469 /// by the current function to the current output stream.
471 void AsmPrinter::EmitJumpTableInfo(MachineJumpTableInfo *MJTI,
472 MachineFunction &MF) {
473 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
474 if (JT.empty()) return;
476 bool IsPic = TM.getRelocationModel() == Reloc::PIC_;
478 // Pick the directive to use to print the jump table entries, and switch to
479 // the appropriate section.
480 TargetLowering *LoweringInfo = TM.getTargetLowering();
482 const Function *F = MF.getFunction();
483 bool JTInDiffSection = false;
484 if (F->isWeakForLinker() ||
485 (IsPic && !LoweringInfo->usesGlobalOffsetTable())) {
486 // In PIC mode, we need to emit the jump table to the same section as the
487 // function body itself, otherwise the label differences won't make sense.
488 // We should also do if the section name is NULL or function is declared in
489 // discardable section.
490 OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang,
493 // Otherwise, drop it in the readonly section.
494 const MCSection *ReadOnlySection =
495 getObjFileLowering().getSectionForConstant(SectionKind::getReadOnly());
496 OutStreamer.SwitchSection(ReadOnlySection);
497 JTInDiffSection = true;
500 EmitAlignment(Log2_32(MJTI->getAlignment()));
502 for (unsigned i = 0, e = JT.size(); i != e; ++i) {
503 const std::vector<MachineBasicBlock*> &JTBBs = JT[i].MBBs;
505 // If this jump table was deleted, ignore it.
506 if (JTBBs.empty()) continue;
508 // For PIC codegen, if possible we want to use the SetDirective to reduce
509 // the number of relocations the assembler will generate for the jump table.
510 // Set directives are all printed before the jump table itself.
511 SmallPtrSet<MachineBasicBlock*, 16> EmittedSets;
512 if (MAI->getSetDirective() && IsPic)
513 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
514 if (EmittedSets.insert(JTBBs[ii]))
515 printPICJumpTableSetLabel(i, JTBBs[ii]);
517 // On some targets (e.g. Darwin) we want to emit two consequtive labels
518 // before each jump table. The first label is never referenced, but tells
519 // the assembler and linker the extents of the jump table object. The
520 // second label is actually referenced by the code.
521 if (JTInDiffSection && MAI->getLinkerPrivateGlobalPrefix()[0]) {
522 O << MAI->getLinkerPrivateGlobalPrefix()
523 << "JTI" << getFunctionNumber() << '_' << i << ":\n";
526 O << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
527 << '_' << i << ":\n";
529 for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
530 printPICJumpTableEntry(MJTI, JTBBs[ii], i);
536 void AsmPrinter::printPICJumpTableEntry(const MachineJumpTableInfo *MJTI,
537 const MachineBasicBlock *MBB,
538 unsigned uid) const {
539 bool isPIC = TM.getRelocationModel() == Reloc::PIC_;
541 // Use JumpTableDirective otherwise honor the entry size from the jump table
543 const char *JTEntryDirective = MAI->getJumpTableDirective(isPIC);
544 bool HadJTEntryDirective = JTEntryDirective != NULL;
545 if (!HadJTEntryDirective) {
546 JTEntryDirective = MJTI->getEntrySize() == 4 ?
547 MAI->getData32bitsDirective() : MAI->getData64bitsDirective();
550 O << JTEntryDirective << ' ';
552 // If we have emitted set directives for the jump table entries, print
553 // them rather than the entries themselves. If we're emitting PIC, then
554 // emit the table entries as differences between two text section labels.
555 // If we're emitting non-PIC code, then emit the entries as direct
556 // references to the target basic blocks.
558 O << *GetMBBSymbol(MBB->getNumber());
559 } else if (MAI->getSetDirective()) {
560 O << MAI->getPrivateGlobalPrefix() << getFunctionNumber()
561 << '_' << uid << "_set_" << MBB->getNumber();
563 O << *GetMBBSymbol(MBB->getNumber());
564 // If the arch uses custom Jump Table directives, don't calc relative to
566 if (!HadJTEntryDirective)
567 O << '-' << MAI->getPrivateGlobalPrefix() << "JTI"
568 << getFunctionNumber() << '_' << uid;
573 /// EmitSpecialLLVMGlobal - Check to see if the specified global is a
574 /// special global used by LLVM. If so, emit it and return true, otherwise
575 /// do nothing and return false.
576 bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
577 if (GV->getName() == "llvm.used") {
578 if (MAI->getUsedDirective() != 0) // No need to emit this at all.
579 EmitLLVMUsedList(GV->getInitializer());
583 // Ignore debug and non-emitted data. This handles llvm.compiler.used.
584 if (GV->getSection() == "llvm.metadata" ||
585 GV->hasAvailableExternallyLinkage())
588 if (!GV->hasAppendingLinkage()) return false;
590 assert(GV->hasInitializer() && "Not a special LLVM global!");
592 const TargetData *TD = TM.getTargetData();
593 unsigned Align = Log2_32(TD->getPointerPrefAlignment());
594 if (GV->getName() == "llvm.global_ctors") {
595 OutStreamer.SwitchSection(getObjFileLowering().getStaticCtorSection());
596 EmitAlignment(Align, 0);
597 EmitXXStructorList(GV->getInitializer());
599 if (TM.getRelocationModel() == Reloc::Static &&
600 MAI->hasStaticCtorDtorReferenceInStaticMode())
601 O << ".reference .constructors_used\n";
605 if (GV->getName() == "llvm.global_dtors") {
606 OutStreamer.SwitchSection(getObjFileLowering().getStaticDtorSection());
607 EmitAlignment(Align, 0);
608 EmitXXStructorList(GV->getInitializer());
610 if (TM.getRelocationModel() == Reloc::Static &&
611 MAI->hasStaticCtorDtorReferenceInStaticMode())
612 O << ".reference .destructors_used\n";
619 /// EmitLLVMUsedList - For targets that define a MAI::UsedDirective, mark each
620 /// global in the specified llvm.used list for which emitUsedDirectiveFor
621 /// is true, as being used with this directive.
622 void AsmPrinter::EmitLLVMUsedList(Constant *List) {
623 const char *Directive = MAI->getUsedDirective();
625 // Should be an array of 'i8*'.
626 ConstantArray *InitList = dyn_cast<ConstantArray>(List);
627 if (InitList == 0) return;
629 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
630 const GlobalValue *GV =
631 dyn_cast<GlobalValue>(InitList->getOperand(i)->stripPointerCasts());
632 if (GV && getObjFileLowering().shouldEmitUsedDirectiveFor(GV, Mang)) {
634 EmitConstantValueOnly(InitList->getOperand(i));
640 /// EmitXXStructorList - Emit the ctor or dtor list. This just prints out the
641 /// function pointers, ignoring the init priority.
642 void AsmPrinter::EmitXXStructorList(Constant *List) {
643 // Should be an array of '{ int, void ()* }' structs. The first value is the
644 // init priority, which we ignore.
645 if (!isa<ConstantArray>(List)) return;
646 ConstantArray *InitList = cast<ConstantArray>(List);
647 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
648 if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
649 if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
651 if (CS->getOperand(1)->isNullValue())
652 return; // Found a null terminator, exit printing.
653 // Emit the function pointer.
654 EmitGlobalConstant(CS->getOperand(1));
658 //===--------------------------------------------------------------------===//
659 // Emission and print routines
662 /// EmitInt8 - Emit a byte directive and value.
664 void AsmPrinter::EmitInt8(int Value) const {
665 OutStreamer.EmitIntValue(Value, 1, 0/*addrspace*/);
668 /// EmitInt16 - Emit a short directive and value.
670 void AsmPrinter::EmitInt16(int Value) const {
671 OutStreamer.EmitIntValue(Value, 2, 0/*addrspace*/);
674 /// EmitInt32 - Emit a long directive and value.
676 void AsmPrinter::EmitInt32(int Value) const {
677 OutStreamer.EmitIntValue(Value, 4, 0/*addrspace*/);
680 /// EmitInt64 - Emit a long long directive and value.
682 void AsmPrinter::EmitInt64(uint64_t Value) const {
683 OutStreamer.EmitIntValue(Value, 8, 0/*addrspace*/);
686 /// toOctal - Convert the low order bits of X into an octal digit.
688 static inline char toOctal(int X) {
692 /// printStringChar - Print a char, escaped if necessary.
694 static void printStringChar(formatted_raw_ostream &O, unsigned char C) {
697 } else if (C == '\\') {
699 } else if (isprint((unsigned char)C)) {
703 case '\b': O << "\\b"; break;
704 case '\f': O << "\\f"; break;
705 case '\n': O << "\\n"; break;
706 case '\r': O << "\\r"; break;
707 case '\t': O << "\\t"; break;
710 O << toOctal(C >> 6);
711 O << toOctal(C >> 3);
712 O << toOctal(C >> 0);
718 /// EmitString - Emit a string with quotes and a null terminator.
719 /// Special characters are emitted properly.
720 /// \literal (Eg. '\t') \endliteral
721 void AsmPrinter::EmitString(const StringRef String) const {
722 EmitString(String.data(), String.size());
725 void AsmPrinter::EmitString(const char *String, unsigned Size) const {
726 const char* AscizDirective = MAI->getAscizDirective();
730 O << MAI->getAsciiDirective();
732 for (unsigned i = 0; i < Size; ++i)
733 printStringChar(O, String[i]);
741 /// EmitFile - Emit a .file directive.
742 void AsmPrinter::EmitFile(unsigned Number, StringRef Name) const {
743 O << "\t.file\t" << Number << " \"";
744 for (unsigned i = 0, N = Name.size(); i < N; ++i)
745 printStringChar(O, Name[i]);
750 //===----------------------------------------------------------------------===//
752 // EmitAlignment - Emit an alignment directive to the specified power of
753 // two boundary. For example, if you pass in 3 here, you will get an 8
754 // byte alignment. If a global value is specified, and if that global has
755 // an explicit alignment requested, it will unconditionally override the
756 // alignment request. However, if ForcedAlignBits is specified, this value
757 // has final say: the ultimate alignment will be the max of ForcedAlignBits
758 // and the alignment computed with NumBits and the global.
762 // if (GV && GV->hasalignment) Align = GV->getalignment();
763 // Align = std::max(Align, ForcedAlignBits);
765 void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV,
766 unsigned ForcedAlignBits,
767 bool UseFillExpr) const {
768 if (GV && GV->getAlignment())
769 NumBits = Log2_32(GV->getAlignment());
770 NumBits = std::max(NumBits, ForcedAlignBits);
772 if (NumBits == 0) return; // No need to emit alignment.
774 unsigned FillValue = 0;
775 if (getCurrentSection()->getKind().isText())
776 FillValue = MAI->getTextAlignFillValue();
778 OutStreamer.EmitValueToAlignment(1 << NumBits, FillValue, 1, 0);
781 // Print out the specified constant, without a storage class. Only the
782 // constants valid in constant expressions can occur here.
783 void AsmPrinter::EmitConstantValueOnly(const Constant *CV) {
784 if (CV->isNullValue() || isa<UndefValue>(CV)) {
789 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
790 O << CI->getZExtValue();
794 if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) {
795 // This is a constant address for a global variable or function. Use the
796 // name of the variable or function as the address value.
797 O << *GetGlobalValueSymbol(GV);
801 if (const BlockAddress *BA = dyn_cast<BlockAddress>(CV)) {
802 O << *GetBlockAddressSymbol(BA);
806 const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV);
808 llvm_unreachable("Unknown constant value!");
813 switch (CE->getOpcode()) {
814 case Instruction::ZExt:
815 case Instruction::SExt:
816 case Instruction::FPTrunc:
817 case Instruction::FPExt:
818 case Instruction::UIToFP:
819 case Instruction::SIToFP:
820 case Instruction::FPToUI:
821 case Instruction::FPToSI:
823 llvm_unreachable("FIXME: Don't support this constant cast expr");
824 case Instruction::GetElementPtr: {
825 // generate a symbolic expression for the byte address
826 const TargetData *TD = TM.getTargetData();
827 const Constant *ptrVal = CE->getOperand(0);
828 SmallVector<Value*, 8> idxVec(CE->op_begin()+1, CE->op_end());
829 int64_t Offset = TD->getIndexedOffset(ptrVal->getType(), &idxVec[0],
832 return EmitConstantValueOnly(ptrVal);
834 // Truncate/sext the offset to the pointer size.
835 if (TD->getPointerSizeInBits() != 64) {
836 int SExtAmount = 64-TD->getPointerSizeInBits();
837 Offset = (Offset << SExtAmount) >> SExtAmount;
842 EmitConstantValueOnly(ptrVal);
844 O << ") + " << Offset;
846 O << ") - " << -Offset;
849 case Instruction::BitCast:
850 return EmitConstantValueOnly(CE->getOperand(0));
852 case Instruction::IntToPtr: {
853 // Handle casts to pointers by changing them into casts to the appropriate
854 // integer type. This promotes constant folding and simplifies this code.
855 const TargetData *TD = TM.getTargetData();
856 Constant *Op = CE->getOperand(0);
857 Op = ConstantExpr::getIntegerCast(Op, TD->getIntPtrType(CV->getContext()),
859 return EmitConstantValueOnly(Op);
862 case Instruction::PtrToInt: {
863 // Support only foldable casts to/from pointers that can be eliminated by
864 // changing the pointer to the appropriately sized integer type.
865 Constant *Op = CE->getOperand(0);
866 const Type *Ty = CE->getType();
867 const TargetData *TD = TM.getTargetData();
869 // We can emit the pointer value into this slot if the slot is an
870 // integer slot greater or equal to the size of the pointer.
871 if (TD->getTypeAllocSize(Ty) == TD->getTypeAllocSize(Op->getType()))
872 return EmitConstantValueOnly(Op);
875 EmitConstantValueOnly(Op);
877 APInt::getAllOnesValue(TD->getTypeAllocSizeInBits(Op->getType()));
880 ptrMask.toStringUnsigned(S);
881 O << ") & " << S.str() << ')';
885 case Instruction::Trunc:
886 // We emit the value and depend on the assembler to truncate the generated
887 // expression properly. This is important for differences between
888 // blockaddress labels. Since the two labels are in the same function, it
889 // is reasonable to treat their delta as a 32-bit value.
890 return EmitConstantValueOnly(CE->getOperand(0));
892 case Instruction::Add:
893 case Instruction::Sub:
894 case Instruction::And:
895 case Instruction::Or:
896 case Instruction::Xor:
898 EmitConstantValueOnly(CE->getOperand(0));
900 switch (CE->getOpcode()) {
901 case Instruction::Add:
904 case Instruction::Sub:
907 case Instruction::And:
910 case Instruction::Or:
913 case Instruction::Xor:
920 EmitConstantValueOnly(CE->getOperand(1));
926 /// printAsCString - Print the specified array as a C compatible string, only if
927 /// the predicate isString is true.
929 static void printAsCString(formatted_raw_ostream &O, const ConstantArray *CVA,
931 assert(CVA->isString() && "Array is not string compatible!");
934 for (unsigned i = 0; i != LastElt; ++i) {
936 (unsigned char)cast<ConstantInt>(CVA->getOperand(i))->getZExtValue();
937 printStringChar(O, C);
942 /// EmitString - Emit a zero-byte-terminated string constant.
944 void AsmPrinter::EmitString(const ConstantArray *CVA) const {
945 unsigned NumElts = CVA->getNumOperands();
946 if (MAI->getAscizDirective() && NumElts &&
947 cast<ConstantInt>(CVA->getOperand(NumElts-1))->getZExtValue() == 0) {
948 O << MAI->getAscizDirective();
949 printAsCString(O, CVA, NumElts-1);
951 O << MAI->getAsciiDirective();
952 printAsCString(O, CVA, NumElts);
957 static void EmitGlobalConstantArray(const ConstantArray *CA, unsigned AddrSpace,
959 if (AddrSpace == 0 && CA->isString()) {
961 } else { // Not a string. Print the values in successive locations
962 for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i)
963 AP.EmitGlobalConstant(CA->getOperand(i), AddrSpace);
967 static void EmitGlobalConstantVector(const ConstantVector *CV,
968 unsigned AddrSpace, AsmPrinter &AP) {
969 for (unsigned i = 0, e = CV->getType()->getNumElements(); i != e; ++i)
970 AP.EmitGlobalConstant(CV->getOperand(i), AddrSpace);
973 static void EmitGlobalConstantStruct(const ConstantStruct *CS,
974 unsigned AddrSpace, AsmPrinter &AP) {
975 // Print the fields in successive locations. Pad to align if needed!
976 const TargetData *TD = AP.TM.getTargetData();
977 unsigned Size = TD->getTypeAllocSize(CS->getType());
978 const StructLayout *Layout = TD->getStructLayout(CS->getType());
979 uint64_t SizeSoFar = 0;
980 for (unsigned i = 0, e = CS->getNumOperands(); i != e; ++i) {
981 const Constant *Field = CS->getOperand(i);
983 // Check if padding is needed and insert one or more 0s.
984 uint64_t FieldSize = TD->getTypeAllocSize(Field->getType());
985 uint64_t PadSize = ((i == e-1 ? Size : Layout->getElementOffset(i+1))
986 - Layout->getElementOffset(i)) - FieldSize;
987 SizeSoFar += FieldSize + PadSize;
989 // Now print the actual field value.
990 AP.EmitGlobalConstant(Field, AddrSpace);
992 // Insert padding - this may include padding to increase the size of the
993 // current field up to the ABI size (if the struct is not packed) as well
994 // as padding to ensure that the next field starts at the right offset.
995 AP.OutStreamer.EmitZeros(PadSize, AddrSpace);
997 assert(SizeSoFar == Layout->getSizeInBytes() &&
998 "Layout of constant struct may be incorrect!");
1001 static void EmitGlobalConstantFP(const ConstantFP *CFP, unsigned AddrSpace,
1003 // FP Constants are printed as integer constants to avoid losing
1005 if (CFP->getType()->isDoubleTy()) {
1006 if (AP.VerboseAsm) {
1007 double Val = CFP->getValueAPF().convertToDouble();
1008 AP.OutStreamer.GetCommentOS() << "double " << Val << '\n';
1011 uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1012 AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace);
1016 if (CFP->getType()->isFloatTy()) {
1017 if (AP.VerboseAsm) {
1018 float Val = CFP->getValueAPF().convertToFloat();
1019 AP.OutStreamer.GetCommentOS() << "float " << Val << '\n';
1021 uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1022 AP.OutStreamer.EmitIntValue(Val, 4, AddrSpace);
1026 if (CFP->getType()->isX86_FP80Ty()) {
1027 // all long double variants are printed as hex
1028 // api needed to prevent premature destruction
1029 APInt API = CFP->getValueAPF().bitcastToAPInt();
1030 const uint64_t *p = API.getRawData();
1031 if (AP.VerboseAsm) {
1032 // Convert to double so we can print the approximate val as a comment.
1033 APFloat DoubleVal = CFP->getValueAPF();
1035 DoubleVal.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven,
1037 AP.OutStreamer.GetCommentOS() << "x86_fp80 ~= "
1038 << DoubleVal.convertToDouble() << '\n';
1041 if (AP.TM.getTargetData()->isBigEndian()) {
1042 AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace);
1043 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1045 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1046 AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace);
1049 // Emit the tail padding for the long double.
1050 const TargetData &TD = *AP.TM.getTargetData();
1051 AP.OutStreamer.EmitZeros(TD.getTypeAllocSize(CFP->getType()) -
1052 TD.getTypeStoreSize(CFP->getType()), AddrSpace);
1056 assert(CFP->getType()->isPPC_FP128Ty() &&
1057 "Floating point constant type not handled");
1058 // All long double variants are printed as hex api needed to prevent
1059 // premature destruction.
1060 APInt API = CFP->getValueAPF().bitcastToAPInt();
1061 const uint64_t *p = API.getRawData();
1062 if (AP.TM.getTargetData()->isBigEndian()) {
1063 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1064 AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace);
1066 AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace);
1067 AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1071 static void EmitGlobalConstantLargeInt(const ConstantInt *CI,
1072 unsigned AddrSpace, AsmPrinter &AP) {
1073 const TargetData *TD = AP.TM.getTargetData();
1074 unsigned BitWidth = CI->getBitWidth();
1075 assert((BitWidth & 63) == 0 && "only support multiples of 64-bits");
1077 // We don't expect assemblers to support integer data directives
1078 // for more than 64 bits, so we emit the data in at most 64-bit
1079 // quantities at a time.
1080 const uint64_t *RawData = CI->getValue().getRawData();
1081 for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) {
1082 uint64_t Val = TD->isBigEndian() ? RawData[e - i - 1] : RawData[i];
1083 AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace);
1087 /// EmitGlobalConstant - Print a general LLVM constant to the .s file.
1088 void AsmPrinter::EmitGlobalConstant(const Constant *CV, unsigned AddrSpace) {
1089 if (isa<ConstantAggregateZero>(CV) || isa<UndefValue>(CV)) {
1090 uint64_t Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
1091 return OutStreamer.EmitZeros(Size, AddrSpace);
1094 if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
1095 unsigned Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
1102 OutStreamer.GetCommentOS() << format("0x%llx\n", CI->getZExtValue());
1103 OutStreamer.EmitIntValue(CI->getZExtValue(), Size, AddrSpace);
1106 EmitGlobalConstantLargeInt(CI, AddrSpace, *this);
1111 if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV))
1112 return EmitGlobalConstantArray(CVA, AddrSpace, *this);
1114 if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV))
1115 return EmitGlobalConstantStruct(CVS, AddrSpace, *this);
1117 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV))
1118 return EmitGlobalConstantFP(CFP, AddrSpace, *this);
1120 if (const ConstantVector *V = dyn_cast<ConstantVector>(CV))
1121 return EmitGlobalConstantVector(V, AddrSpace, *this);
1123 if (isa<ConstantPointerNull>(CV)) {
1124 unsigned Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
1125 OutStreamer.EmitIntValue(0, Size, AddrSpace);
1129 // Otherwise, it must be a ConstantExpr. Emit the data directive, then emit
1130 // the expression value.
1131 switch (TM.getTargetData()->getTypeAllocSize(CV->getType())) {
1133 case 1: O << MAI->getData8bitsDirective(AddrSpace); break;
1134 case 2: O << MAI->getData16bitsDirective(AddrSpace); break;
1135 case 4: O << MAI->getData32bitsDirective(AddrSpace); break;
1137 if (const char *Dir = MAI->getData64bitsDirective(AddrSpace)) {
1143 llvm_unreachable("Target cannot handle given data directive width!");
1147 EmitConstantValueOnly(CV);
1151 void AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
1152 // Target doesn't support this yet!
1153 llvm_unreachable("Target does not support EmitMachineConstantPoolValue");
1156 /// PrintSpecial - Print information related to the specified machine instr
1157 /// that is independent of the operand, and may be independent of the instr
1158 /// itself. This can be useful for portably encoding the comment character
1159 /// or other bits of target-specific knowledge into the asmstrings. The
1160 /// syntax used is ${:comment}. Targets can override this to add support
1161 /// for their own strange codes.
1162 void AsmPrinter::PrintSpecial(const MachineInstr *MI, const char *Code) const {
1163 if (!strcmp(Code, "private")) {
1164 O << MAI->getPrivateGlobalPrefix();
1165 } else if (!strcmp(Code, "comment")) {
1167 O << MAI->getCommentString();
1168 } else if (!strcmp(Code, "uid")) {
1169 // Comparing the address of MI isn't sufficient, because machineinstrs may
1170 // be allocated to the same address across functions.
1171 const Function *ThisF = MI->getParent()->getParent()->getFunction();
1173 // If this is a new LastFn instruction, bump the counter.
1174 if (LastMI != MI || LastFn != ThisF) {
1182 raw_string_ostream Msg(msg);
1183 Msg << "Unknown special formatter '" << Code
1184 << "' for machine instr: " << *MI;
1185 llvm_report_error(Msg.str());
1189 /// processDebugLoc - Processes the debug information of each machine
1190 /// instruction's DebugLoc.
1191 void AsmPrinter::processDebugLoc(const MachineInstr *MI,
1192 bool BeforePrintingInsn) {
1193 if (!MAI || !DW || !MAI->doesSupportDebugInformation()
1194 || !DW->ShouldEmitDwarfDebug())
1196 DebugLoc DL = MI->getDebugLoc();
1199 DILocation CurDLT = MF->getDILocation(DL);
1200 if (CurDLT.getScope().isNull())
1203 if (!BeforePrintingInsn) {
1204 // After printing instruction
1206 } else if (CurDLT.getNode() != PrevDLT) {
1207 unsigned L = DW->RecordSourceLine(CurDLT.getLineNumber(),
1208 CurDLT.getColumnNumber(),
1209 CurDLT.getScope().getNode());
1212 DW->BeginScope(MI, L);
1213 PrevDLT = CurDLT.getNode();
1218 /// printInlineAsm - This method formats and prints the specified machine
1219 /// instruction that is an inline asm.
1220 void AsmPrinter::printInlineAsm(const MachineInstr *MI) const {
1221 unsigned NumOperands = MI->getNumOperands();
1223 // Count the number of register definitions.
1224 unsigned NumDefs = 0;
1225 for (; MI->getOperand(NumDefs).isReg() && MI->getOperand(NumDefs).isDef();
1227 assert(NumDefs != NumOperands-1 && "No asm string?");
1229 assert(MI->getOperand(NumDefs).isSymbol() && "No asm string?");
1231 // Disassemble the AsmStr, printing out the literal pieces, the operands, etc.
1232 const char *AsmStr = MI->getOperand(NumDefs).getSymbolName();
1236 // If this asmstr is empty, just print the #APP/#NOAPP markers.
1237 // These are useful to see where empty asm's wound up.
1238 if (AsmStr[0] == 0) {
1239 O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t";
1240 O << MAI->getCommentString() << MAI->getInlineAsmEnd() << '\n';
1244 O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t";
1246 // The variant of the current asmprinter.
1247 int AsmPrinterVariant = MAI->getAssemblerDialect();
1249 int CurVariant = -1; // The number of the {.|.|.} region we are in.
1250 const char *LastEmitted = AsmStr; // One past the last character emitted.
1252 while (*LastEmitted) {
1253 switch (*LastEmitted) {
1255 // Not a special case, emit the string section literally.
1256 const char *LiteralEnd = LastEmitted+1;
1257 while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' &&
1258 *LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n')
1260 if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1261 O.write(LastEmitted, LiteralEnd-LastEmitted);
1262 LastEmitted = LiteralEnd;
1266 ++LastEmitted; // Consume newline character.
1267 O << '\n'; // Indent code with newline.
1270 ++LastEmitted; // Consume '$' character.
1274 switch (*LastEmitted) {
1275 default: Done = false; break;
1276 case '$': // $$ -> $
1277 if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1279 ++LastEmitted; // Consume second '$' character.
1281 case '(': // $( -> same as GCC's { character.
1282 ++LastEmitted; // Consume '(' character.
1283 if (CurVariant != -1) {
1284 llvm_report_error("Nested variants found in inline asm string: '"
1285 + std::string(AsmStr) + "'");
1287 CurVariant = 0; // We're in the first variant now.
1290 ++LastEmitted; // consume '|' character.
1291 if (CurVariant == -1)
1292 O << '|'; // this is gcc's behavior for | outside a variant
1294 ++CurVariant; // We're in the next variant.
1296 case ')': // $) -> same as GCC's } char.
1297 ++LastEmitted; // consume ')' character.
1298 if (CurVariant == -1)
1299 O << '}'; // this is gcc's behavior for } outside a variant
1306 bool HasCurlyBraces = false;
1307 if (*LastEmitted == '{') { // ${variable}
1308 ++LastEmitted; // Consume '{' character.
1309 HasCurlyBraces = true;
1312 // If we have ${:foo}, then this is not a real operand reference, it is a
1313 // "magic" string reference, just like in .td files. Arrange to call
1315 if (HasCurlyBraces && *LastEmitted == ':') {
1317 const char *StrStart = LastEmitted;
1318 const char *StrEnd = strchr(StrStart, '}');
1320 llvm_report_error("Unterminated ${:foo} operand in inline asm string: '"
1321 + std::string(AsmStr) + "'");
1324 std::string Val(StrStart, StrEnd);
1325 PrintSpecial(MI, Val.c_str());
1326 LastEmitted = StrEnd+1;
1330 const char *IDStart = LastEmitted;
1333 long Val = strtol(IDStart, &IDEnd, 10); // We only accept numbers for IDs.
1334 if (!isdigit(*IDStart) || (Val == 0 && errno == EINVAL)) {
1335 llvm_report_error("Bad $ operand number in inline asm string: '"
1336 + std::string(AsmStr) + "'");
1338 LastEmitted = IDEnd;
1340 char Modifier[2] = { 0, 0 };
1342 if (HasCurlyBraces) {
1343 // If we have curly braces, check for a modifier character. This
1344 // supports syntax like ${0:u}, which correspond to "%u0" in GCC asm.
1345 if (*LastEmitted == ':') {
1346 ++LastEmitted; // Consume ':' character.
1347 if (*LastEmitted == 0) {
1348 llvm_report_error("Bad ${:} expression in inline asm string: '"
1349 + std::string(AsmStr) + "'");
1352 Modifier[0] = *LastEmitted;
1353 ++LastEmitted; // Consume modifier character.
1356 if (*LastEmitted != '}') {
1357 llvm_report_error("Bad ${} expression in inline asm string: '"
1358 + std::string(AsmStr) + "'");
1360 ++LastEmitted; // Consume '}' character.
1363 if ((unsigned)Val >= NumOperands-1) {
1364 llvm_report_error("Invalid $ operand number in inline asm string: '"
1365 + std::string(AsmStr) + "'");
1368 // Okay, we finally have a value number. Ask the target to print this
1370 if (CurVariant == -1 || CurVariant == AsmPrinterVariant) {
1375 // Scan to find the machine operand number for the operand.
1376 for (; Val; --Val) {
1377 if (OpNo >= MI->getNumOperands()) break;
1378 unsigned OpFlags = MI->getOperand(OpNo).getImm();
1379 OpNo += InlineAsm::getNumOperandRegisters(OpFlags) + 1;
1382 if (OpNo >= MI->getNumOperands()) {
1385 unsigned OpFlags = MI->getOperand(OpNo).getImm();
1386 ++OpNo; // Skip over the ID number.
1388 if (Modifier[0] == 'l') // labels are target independent
1389 O << *GetMBBSymbol(MI->getOperand(OpNo).getMBB()->getNumber());
1391 AsmPrinter *AP = const_cast<AsmPrinter*>(this);
1392 if ((OpFlags & 7) == 4) {
1393 Error = AP->PrintAsmMemoryOperand(MI, OpNo, AsmPrinterVariant,
1394 Modifier[0] ? Modifier : 0);
1396 Error = AP->PrintAsmOperand(MI, OpNo, AsmPrinterVariant,
1397 Modifier[0] ? Modifier : 0);
1403 raw_string_ostream Msg(msg);
1404 Msg << "Invalid operand found in inline asm: '" << AsmStr << "'\n";
1406 llvm_report_error(Msg.str());
1413 O << "\n\t" << MAI->getCommentString() << MAI->getInlineAsmEnd();
1416 /// printImplicitDef - This method prints the specified machine instruction
1417 /// that is an implicit def.
1418 void AsmPrinter::printImplicitDef(const MachineInstr *MI) const {
1419 if (!VerboseAsm) return;
1420 O.PadToColumn(MAI->getCommentColumn());
1421 O << MAI->getCommentString() << " implicit-def: "
1422 << TRI->getName(MI->getOperand(0).getReg());
1425 void AsmPrinter::printKill(const MachineInstr *MI) const {
1426 if (!VerboseAsm) return;
1427 O.PadToColumn(MAI->getCommentColumn());
1428 O << MAI->getCommentString() << " kill:";
1429 for (unsigned n = 0, e = MI->getNumOperands(); n != e; ++n) {
1430 const MachineOperand &op = MI->getOperand(n);
1431 assert(op.isReg() && "KILL instruction must have only register operands");
1432 O << ' ' << TRI->getName(op.getReg()) << (op.isDef() ? "<def>" : "<kill>");
1436 /// printLabel - This method prints a local label used by debug and
1437 /// exception handling tables.
1438 void AsmPrinter::printLabel(const MachineInstr *MI) const {
1439 printLabel(MI->getOperand(0).getImm());
1442 void AsmPrinter::printLabel(unsigned Id) const {
1443 O << MAI->getPrivateGlobalPrefix() << "label" << Id << ':';
1446 /// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
1447 /// instruction, using the specified assembler variant. Targets should
1448 /// override this to format as appropriate.
1449 bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
1450 unsigned AsmVariant, const char *ExtraCode) {
1451 // Target doesn't support this yet!
1455 bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
1456 unsigned AsmVariant,
1457 const char *ExtraCode) {
1458 // Target doesn't support this yet!
1462 MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BlockAddress *BA,
1463 const char *Suffix) const {
1464 return GetBlockAddressSymbol(BA->getFunction(), BA->getBasicBlock(), Suffix);
1467 MCSymbol *AsmPrinter::GetBlockAddressSymbol(const Function *F,
1468 const BasicBlock *BB,
1469 const char *Suffix) const {
1470 assert(BB->hasName() &&
1471 "Address of anonymous basic block not supported yet!");
1473 // This code must use the function name itself, and not the function number,
1474 // since it must be possible to generate the label name from within other
1476 SmallString<60> FnName;
1477 Mang->getNameWithPrefix(FnName, F, false);
1479 // FIXME: THIS IS BROKEN IF THE LLVM BASIC BLOCK DOESN'T HAVE A NAME!
1480 SmallString<60> NameResult;
1481 Mang->getNameWithPrefix(NameResult,
1482 StringRef("BA") + Twine((unsigned)FnName.size()) +
1483 "_" + FnName.str() + "_" + BB->getName() + Suffix,
1486 return OutContext.GetOrCreateSymbol(NameResult.str());
1489 MCSymbol *AsmPrinter::GetMBBSymbol(unsigned MBBID) const {
1490 SmallString<60> Name;
1491 raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "BB"
1492 << getFunctionNumber() << '_' << MBBID;
1494 return OutContext.GetOrCreateSymbol(Name.str());
1497 /// GetGlobalValueSymbol - Return the MCSymbol for the specified global
1499 MCSymbol *AsmPrinter::GetGlobalValueSymbol(const GlobalValue *GV) const {
1500 SmallString<60> NameStr;
1501 Mang->getNameWithPrefix(NameStr, GV, false);
1502 return OutContext.GetOrCreateSymbol(NameStr.str());
1505 /// GetSymbolWithGlobalValueBase - Return the MCSymbol for a symbol with
1506 /// global value name as its base, with the specified suffix, and where the
1507 /// symbol is forced to have private linkage if ForcePrivate is true.
1508 MCSymbol *AsmPrinter::GetSymbolWithGlobalValueBase(const GlobalValue *GV,
1510 bool ForcePrivate) const {
1511 SmallString<60> NameStr;
1512 Mang->getNameWithPrefix(NameStr, GV, ForcePrivate);
1513 NameStr.append(Suffix.begin(), Suffix.end());
1514 return OutContext.GetOrCreateSymbol(NameStr.str());
1517 /// GetExternalSymbolSymbol - Return the MCSymbol for the specified
1519 MCSymbol *AsmPrinter::GetExternalSymbolSymbol(StringRef Sym) const {
1520 SmallString<60> NameStr;
1521 Mang->getNameWithPrefix(NameStr, Sym);
1522 return OutContext.GetOrCreateSymbol(NameStr.str());
1527 /// PrintParentLoopComment - Print comments about parent loops of this one.
1528 static void PrintParentLoopComment(raw_ostream &OS, const MachineLoop *Loop,
1529 unsigned FunctionNumber) {
1530 if (Loop == 0) return;
1531 PrintParentLoopComment(OS, Loop->getParentLoop(), FunctionNumber);
1532 OS.indent(Loop->getLoopDepth()*2)
1533 << "Parent Loop BB" << FunctionNumber << "_"
1534 << Loop->getHeader()->getNumber()
1535 << " Depth=" << Loop->getLoopDepth() << '\n';
1539 /// PrintChildLoopComment - Print comments about child loops within
1540 /// the loop for this basic block, with nesting.
1541 static void PrintChildLoopComment(raw_ostream &OS, const MachineLoop *Loop,
1542 unsigned FunctionNumber) {
1543 // Add child loop information
1544 for (MachineLoop::iterator CL = Loop->begin(), E = Loop->end();CL != E; ++CL){
1545 OS.indent((*CL)->getLoopDepth()*2)
1546 << "Child Loop BB" << FunctionNumber << "_"
1547 << (*CL)->getHeader()->getNumber() << " Depth " << (*CL)->getLoopDepth()
1549 PrintChildLoopComment(OS, *CL, FunctionNumber);
1553 /// EmitComments - Pretty-print comments for basic blocks.
1554 static void PrintBasicBlockLoopComments(const MachineBasicBlock &MBB,
1555 const MachineLoopInfo *LI,
1556 const AsmPrinter &AP) {
1557 // Add loop depth information
1558 const MachineLoop *Loop = LI->getLoopFor(&MBB);
1559 if (Loop == 0) return;
1561 MachineBasicBlock *Header = Loop->getHeader();
1562 assert(Header && "No header for loop");
1564 // If this block is not a loop header, just print out what is the loop header
1566 if (Header != &MBB) {
1567 AP.OutStreamer.AddComment(" in Loop: Header=BB" +
1568 Twine(AP.getFunctionNumber())+"_" +
1569 Twine(Loop->getHeader()->getNumber())+
1570 " Depth="+Twine(Loop->getLoopDepth()));
1574 // Otherwise, it is a loop header. Print out information about child and
1576 raw_ostream &OS = AP.OutStreamer.GetCommentOS();
1578 PrintParentLoopComment(OS, Loop->getParentLoop(), AP.getFunctionNumber());
1581 OS.indent(Loop->getLoopDepth()*2-2);
1586 OS << "Loop Header: Depth=" + Twine(Loop->getLoopDepth()) << '\n';
1588 PrintChildLoopComment(OS, Loop, AP.getFunctionNumber());
1592 /// EmitBasicBlockStart - This method prints the label for the specified
1593 /// MachineBasicBlock, an alignment (if present) and a comment describing
1594 /// it if appropriate.
1595 void AsmPrinter::EmitBasicBlockStart(const MachineBasicBlock *MBB) const {
1596 // Emit an alignment directive for this block, if needed.
1597 if (unsigned Align = MBB->getAlignment())
1598 EmitAlignment(Log2_32(Align));
1600 // If the block has its address taken, emit a special label to satisfy
1601 // references to the block. This is done so that we don't need to
1602 // remember the number of this label, and so that we can make
1603 // forward references to labels without knowing what their numbers
1605 if (MBB->hasAddressTaken()) {
1606 const BasicBlock *BB = MBB->getBasicBlock();
1608 OutStreamer.AddComment("Address Taken");
1609 OutStreamer.EmitLabel(GetBlockAddressSymbol(BB->getParent(), BB));
1612 // Print the main label for the block.
1613 if (MBB->pred_empty() || MBB->isOnlyReachableByFallthrough()) {
1615 O << MAI->getCommentString() << " BB#" << MBB->getNumber() << ':';
1616 if (const BasicBlock *BB = MBB->getBasicBlock())
1618 OutStreamer.AddComment("%" + BB->getName());
1620 PrintBasicBlockLoopComments(*MBB, LI, *this);
1621 OutStreamer.AddBlankLine();
1625 if (const BasicBlock *BB = MBB->getBasicBlock())
1627 OutStreamer.AddComment("%" + BB->getName());
1628 PrintBasicBlockLoopComments(*MBB, LI, *this);
1631 OutStreamer.EmitLabel(GetMBBSymbol(MBB->getNumber()));
1635 /// printPICJumpTableSetLabel - This method prints a set label for the
1636 /// specified MachineBasicBlock for a jumptable entry.
1637 void AsmPrinter::printPICJumpTableSetLabel(unsigned uid,
1638 const MachineBasicBlock *MBB) const {
1639 if (!MAI->getSetDirective())
1642 O << MAI->getSetDirective() << ' ' << MAI->getPrivateGlobalPrefix()
1643 << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ','
1644 << *GetMBBSymbol(MBB->getNumber())
1645 << '-' << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
1646 << '_' << uid << '\n';
1649 void AsmPrinter::printPICJumpTableSetLabel(unsigned uid, unsigned uid2,
1650 const MachineBasicBlock *MBB) const {
1651 if (!MAI->getSetDirective())
1654 O << MAI->getSetDirective() << ' ' << MAI->getPrivateGlobalPrefix()
1655 << getFunctionNumber() << '_' << uid << '_' << uid2
1656 << "_set_" << MBB->getNumber() << ','
1657 << *GetMBBSymbol(MBB->getNumber())
1658 << '-' << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
1659 << '_' << uid << '_' << uid2 << '\n';
1662 void AsmPrinter::printVisibility(const MCSymbol *Sym,
1663 unsigned Visibility) const {
1664 if (Visibility == GlobalValue::HiddenVisibility) {
1665 if (const char *Directive = MAI->getHiddenDirective())
1666 O << Directive << *Sym << '\n';
1667 } else if (Visibility == GlobalValue::ProtectedVisibility) {
1668 if (const char *Directive = MAI->getProtectedDirective())
1669 O << Directive << *Sym << '\n';
1673 void AsmPrinter::printOffset(int64_t Offset) const {
1676 else if (Offset < 0)
1680 GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy *S) {
1681 if (!S->usesMetadata())
1684 gcp_iterator GCPI = GCMetadataPrinters.find(S);
1685 if (GCPI != GCMetadataPrinters.end())
1686 return GCPI->second;
1688 const char *Name = S->getName().c_str();
1690 for (GCMetadataPrinterRegistry::iterator
1691 I = GCMetadataPrinterRegistry::begin(),
1692 E = GCMetadataPrinterRegistry::end(); I != E; ++I)
1693 if (strcmp(Name, I->getName()) == 0) {
1694 GCMetadataPrinter *GMP = I->instantiate();
1696 GCMetadataPrinters.insert(std::make_pair(S, GMP));
1700 errs() << "no GCMetadataPrinter registered for GC: " << Name << "\n";
1701 llvm_unreachable(0);
1704 /// EmitComments - Pretty-print comments for instructions
1705 void AsmPrinter::EmitComments(const MachineInstr &MI) const {
1709 bool Newline = false;
1711 if (!MI.getDebugLoc().isUnknown()) {
1712 DILocation DLT = MF->getDILocation(MI.getDebugLoc());
1714 // Print source line info.
1715 O.PadToColumn(MAI->getCommentColumn());
1716 O << MAI->getCommentString() << ' ';
1717 DIScope Scope = DLT.getScope();
1718 // Omit the directory, because it's likely to be long and uninteresting.
1719 if (!Scope.isNull())
1720 O << Scope.getFilename();
1723 O << ':' << DLT.getLineNumber();
1724 if (DLT.getColumnNumber() != 0)
1725 O << ':' << DLT.getColumnNumber();
1729 // Check for spills and reloads
1732 const MachineFrameInfo *FrameInfo =
1733 MI.getParent()->getParent()->getFrameInfo();
1735 // We assume a single instruction only has a spill or reload, not
1737 const MachineMemOperand *MMO;
1738 if (TM.getInstrInfo()->isLoadFromStackSlotPostFE(&MI, FI)) {
1739 if (FrameInfo->isSpillSlotObjectIndex(FI)) {
1740 MMO = *MI.memoperands_begin();
1741 if (Newline) O << '\n';
1742 O.PadToColumn(MAI->getCommentColumn());
1743 O << MAI->getCommentString() << ' ' << MMO->getSize() << "-byte Reload";
1747 else if (TM.getInstrInfo()->hasLoadFromStackSlot(&MI, MMO, FI)) {
1748 if (FrameInfo->isSpillSlotObjectIndex(FI)) {
1749 if (Newline) O << '\n';
1750 O.PadToColumn(MAI->getCommentColumn());
1751 O << MAI->getCommentString() << ' '
1752 << MMO->getSize() << "-byte Folded Reload";
1756 else if (TM.getInstrInfo()->isStoreToStackSlotPostFE(&MI, FI)) {
1757 if (FrameInfo->isSpillSlotObjectIndex(FI)) {
1758 MMO = *MI.memoperands_begin();
1759 if (Newline) O << '\n';
1760 O.PadToColumn(MAI->getCommentColumn());
1761 O << MAI->getCommentString() << ' ' << MMO->getSize() << "-byte Spill";
1765 else if (TM.getInstrInfo()->hasStoreToStackSlot(&MI, MMO, FI)) {
1766 if (FrameInfo->isSpillSlotObjectIndex(FI)) {
1767 if (Newline) O << '\n';
1768 O.PadToColumn(MAI->getCommentColumn());
1769 O << MAI->getCommentString() << ' '
1770 << MMO->getSize() << "-byte Folded Spill";
1775 // Check for spill-induced copies
1776 unsigned SrcReg, DstReg, SrcSubIdx, DstSubIdx;
1777 if (TM.getInstrInfo()->isMoveInstr(MI, SrcReg, DstReg,
1778 SrcSubIdx, DstSubIdx)) {
1779 if (MI.getAsmPrinterFlag(ReloadReuse)) {
1780 if (Newline) O << '\n';
1781 O.PadToColumn(MAI->getCommentColumn());
1782 O << MAI->getCommentString() << " Reload Reuse";