LLVM  6.0.0svn
AsmPrinter.cpp
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1 //===-- AsmPrinter.cpp - Common AsmPrinter code ---------------------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file implements the AsmPrinter class.
11 //
12 //===----------------------------------------------------------------------===//
13 
15 #include "AsmPrinterHandler.h"
16 #include "CodeViewDebug.h"
17 #include "DwarfDebug.h"
18 #include "DwarfException.h"
19 #include "WinException.h"
20 #include "llvm/ADT/APFloat.h"
21 #include "llvm/ADT/APInt.h"
22 #include "llvm/ADT/DenseMap.h"
23 #include "llvm/ADT/STLExtras.h"
24 #include "llvm/ADT/SmallPtrSet.h"
25 #include "llvm/ADT/SmallString.h"
26 #include "llvm/ADT/SmallVector.h"
27 #include "llvm/ADT/Statistic.h"
28 #include "llvm/ADT/StringRef.h"
29 #include "llvm/ADT/Triple.h"
30 #include "llvm/ADT/Twine.h"
34 #include "llvm/BinaryFormat/ELF.h"
35 #include "llvm/CodeGen/Analysis.h"
52 #include "llvm/IR/BasicBlock.h"
53 #include "llvm/IR/Constant.h"
54 #include "llvm/IR/Constants.h"
55 #include "llvm/IR/DataLayout.h"
57 #include "llvm/IR/DerivedTypes.h"
58 #include "llvm/IR/Function.h"
59 #include "llvm/IR/GlobalAlias.h"
60 #include "llvm/IR/GlobalIFunc.h"
62 #include "llvm/IR/GlobalObject.h"
63 #include "llvm/IR/GlobalValue.h"
64 #include "llvm/IR/GlobalVariable.h"
65 #include "llvm/IR/Mangler.h"
66 #include "llvm/IR/Metadata.h"
67 #include "llvm/IR/Module.h"
68 #include "llvm/IR/Operator.h"
69 #include "llvm/IR/Value.h"
70 #include "llvm/MC/MCAsmInfo.h"
71 #include "llvm/MC/MCContext.h"
72 #include "llvm/MC/MCDirectives.h"
73 #include "llvm/MC/MCExpr.h"
74 #include "llvm/MC/MCInst.h"
75 #include "llvm/MC/MCSection.h"
76 #include "llvm/MC/MCSectionELF.h"
77 #include "llvm/MC/MCSectionMachO.h"
78 #include "llvm/MC/MCStreamer.h"
80 #include "llvm/MC/MCSymbol.h"
82 #include "llvm/MC/MCValue.h"
83 #include "llvm/MC/SectionKind.h"
84 #include "llvm/Pass.h"
85 #include "llvm/Support/Casting.h"
86 #include "llvm/Support/Compiler.h"
88 #include "llvm/Support/Format.h"
91 #include "llvm/Support/Timer.h"
100 #include <algorithm>
101 #include <cassert>
102 #include <cinttypes>
103 #include <cstdint>
104 #include <limits>
105 #include <memory>
106 #include <string>
107 #include <utility>
108 #include <vector>
109 
110 using namespace llvm;
111 
112 #define DEBUG_TYPE "asm-printer"
113 
114 static const char *const DWARFGroupName = "dwarf";
115 static const char *const DWARFGroupDescription = "DWARF Emission";
116 static const char *const DbgTimerName = "emit";
117 static const char *const DbgTimerDescription = "Debug Info Emission";
118 static const char *const EHTimerName = "write_exception";
119 static const char *const EHTimerDescription = "DWARF Exception Writer";
120 static const char *const CodeViewLineTablesGroupName = "linetables";
121 static const char *const CodeViewLineTablesGroupDescription =
122  "CodeView Line Tables";
123 
124 STATISTIC(EmittedInsts, "Number of machine instrs printed");
125 
126 static cl::opt<bool>
127  PrintSchedule("print-schedule", cl::Hidden, cl::init(false),
128  cl::desc("Print 'sched: [latency:throughput]' in .s output"));
129 
130 char AsmPrinter::ID = 0;
131 
133 static gcp_map_type &getGCMap(void *&P) {
134  if (!P)
135  P = new gcp_map_type();
136  return *(gcp_map_type*)P;
137 }
138 
139 /// getGVAlignmentLog2 - Return the alignment to use for the specified global
140 /// value in log2 form. This rounds up to the preferred alignment if possible
141 /// and legal.
142 static unsigned getGVAlignmentLog2(const GlobalValue *GV, const DataLayout &DL,
143  unsigned InBits = 0) {
144  unsigned NumBits = 0;
145  if (const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV))
146  NumBits = DL.getPreferredAlignmentLog(GVar);
147 
148  // If InBits is specified, round it to it.
149  if (InBits > NumBits)
150  NumBits = InBits;
151 
152  // If the GV has a specified alignment, take it into account.
153  if (GV->getAlignment() == 0)
154  return NumBits;
155 
156  unsigned GVAlign = Log2_32(GV->getAlignment());
157 
158  // If the GVAlign is larger than NumBits, or if we are required to obey
159  // NumBits because the GV has an assigned section, obey it.
160  if (GVAlign > NumBits || GV->hasSection())
161  NumBits = GVAlign;
162  return NumBits;
163 }
164 
165 AsmPrinter::AsmPrinter(TargetMachine &tm, std::unique_ptr<MCStreamer> Streamer)
166  : MachineFunctionPass(ID), TM(tm), MAI(tm.getMCAsmInfo()),
167  OutContext(Streamer->getContext()), OutStreamer(std::move(Streamer)) {
168  VerboseAsm = OutStreamer->isVerboseAsm();
169 }
170 
172  assert(!DD && Handlers.empty() && "Debug/EH info didn't get finalized");
173 
174  if (GCMetadataPrinters) {
175  gcp_map_type &GCMap = getGCMap(GCMetadataPrinters);
176 
177  delete &GCMap;
178  GCMetadataPrinters = nullptr;
179  }
180 }
181 
183  return TM.isPositionIndependent();
184 }
185 
186 /// getFunctionNumber - Return a unique ID for the current function.
187 ///
189  return MF->getFunctionNumber();
190 }
191 
193  return *TM.getObjFileLowering();
194 }
195 
197  return MMI->getModule()->getDataLayout();
198 }
199 
200 // Do not use the cached DataLayout because some client use it without a Module
201 // (llvm-dsymutil, llvm-dwarfdump).
202 unsigned AsmPrinter::getPointerSize() const { return TM.getPointerSize(); }
203 
205  assert(MF && "getSubtargetInfo requires a valid MachineFunction!");
206  return MF->getSubtarget<MCSubtargetInfo>();
207 }
208 
211 }
212 
213 /// getCurrentSection() - Return the current section we are emitting to.
215  return OutStreamer->getCurrentSectionOnly();
216 }
217 
219  AU.setPreservesAll();
224  if (isVerbose())
226 }
227 
229  MMI = getAnalysisIfAvailable<MachineModuleInfo>();
230 
231  // Initialize TargetLoweringObjectFile.
233  .Initialize(OutContext, TM);
234 
235  OutStreamer->InitSections(false);
236 
237  // Emit the version-min deplyment target directive if needed.
238  //
239  // FIXME: If we end up with a collection of these sorts of Darwin-specific
240  // or ELF-specific things, it may make sense to have a platform helper class
241  // that will work with the target helper class. For now keep it here, as the
242  // alternative is duplicated code in each of the target asm printers that
243  // use the directive, where it would need the same conditionalization
244  // anyway.
245  const Triple &TT = TM.getTargetTriple();
246  // If there is a version specified, Major will be non-zero.
247  if (TT.isOSDarwin() && TT.getOSMajorVersion() != 0) {
248  unsigned Major, Minor, Update;
249  MCVersionMinType VersionType;
250  if (TT.isWatchOS()) {
251  VersionType = MCVM_WatchOSVersionMin;
252  TT.getWatchOSVersion(Major, Minor, Update);
253  } else if (TT.isTvOS()) {
254  VersionType = MCVM_TvOSVersionMin;
255  TT.getiOSVersion(Major, Minor, Update);
256  } else if (TT.isMacOSX()) {
257  VersionType = MCVM_OSXVersionMin;
258  if (!TT.getMacOSXVersion(Major, Minor, Update))
259  Major = 0;
260  } else {
261  VersionType = MCVM_IOSVersionMin;
262  TT.getiOSVersion(Major, Minor, Update);
263  }
264  if (Major != 0)
265  OutStreamer->EmitVersionMin(VersionType, Major, Minor, Update);
266  }
267 
268  // Allow the target to emit any magic that it wants at the start of the file.
270 
271  // Very minimal debug info. It is ignored if we emit actual debug info. If we
272  // don't, this at least helps the user find where a global came from.
274  // .file "foo.c"
275  OutStreamer->EmitFileDirective(M.getSourceFileName());
276  }
277 
278  GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
279  assert(MI && "AsmPrinter didn't require GCModuleInfo?");
280  for (auto &I : *MI)
281  if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I))
282  MP->beginAssembly(M, *MI, *this);
283 
284  // Emit module-level inline asm if it exists.
285  if (!M.getModuleInlineAsm().empty()) {
286  // We're at the module level. Construct MCSubtarget from the default CPU
287  // and target triple.
288  std::unique_ptr<MCSubtargetInfo> STI(TM.getTarget().createMCSubtargetInfo(
291  OutStreamer->AddComment("Start of file scope inline assembly");
292  OutStreamer->AddBlankLine();
293  EmitInlineAsm(M.getModuleInlineAsm()+"\n",
295  OutStreamer->AddComment("End of file scope inline assembly");
296  OutStreamer->AddBlankLine();
297  }
298 
300  bool EmitCodeView = MMI->getModule()->getCodeViewFlag();
301  if (EmitCodeView && (TM.getTargetTriple().isKnownWindowsMSVCEnvironment() ||
303  Handlers.push_back(HandlerInfo(new CodeViewDebug(this),
304  DbgTimerName, DbgTimerDescription,
305  CodeViewLineTablesGroupName,
306  CodeViewLineTablesGroupDescription));
307  }
308  if (!EmitCodeView || MMI->getModule()->getDwarfVersion()) {
309  DD = new DwarfDebug(this, &M);
310  DD->beginModule();
311  Handlers.push_back(HandlerInfo(DD, DbgTimerName, DbgTimerDescription,
312  DWARFGroupName, DWARFGroupDescription));
313  }
314  }
315 
316  switch (MAI->getExceptionHandlingType()) {
320  isCFIMoveForDebugging = true;
322  break;
323  for (auto &F: M.getFunctionList()) {
324  // If the module contains any function with unwind data,
325  // .eh_frame has to be emitted.
326  // Ignore functions that won't get emitted.
327  if (!F.isDeclarationForLinker() && F.needsUnwindTableEntry()) {
328  isCFIMoveForDebugging = false;
329  break;
330  }
331  }
332  break;
333  default:
334  isCFIMoveForDebugging = false;
335  break;
336  }
337 
338  EHStreamer *ES = nullptr;
339  switch (MAI->getExceptionHandlingType()) {
341  break;
344  ES = new DwarfCFIException(this);
345  break;
347  ES = new ARMException(this);
348  break;
350  switch (MAI->getWinEHEncodingType()) {
351  default: llvm_unreachable("unsupported unwinding information encoding");
353  break;
356  ES = new WinException(this);
357  break;
358  }
359  break;
360  }
361  if (ES)
362  Handlers.push_back(HandlerInfo(ES, EHTimerName, EHTimerDescription,
363  DWARFGroupName, DWARFGroupDescription));
364  return false;
365 }
366 
367 static bool canBeHidden(const GlobalValue *GV, const MCAsmInfo &MAI) {
369  return false;
370 
371  return canBeOmittedFromSymbolTable(GV);
372 }
373 
374 void AsmPrinter::EmitLinkage(const GlobalValue *GV, MCSymbol *GVSym) const {
375  GlobalValue::LinkageTypes Linkage = GV->getLinkage();
376  switch (Linkage) {
382  if (MAI->hasWeakDefDirective()) {
383  // .globl _foo
384  OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Global);
385 
386  if (!canBeHidden(GV, *MAI))
387  // .weak_definition _foo
388  OutStreamer->EmitSymbolAttribute(GVSym, MCSA_WeakDefinition);
389  else
390  OutStreamer->EmitSymbolAttribute(GVSym, MCSA_WeakDefAutoPrivate);
391  } else if (MAI->hasLinkOnceDirective()) {
392  // .globl _foo
393  OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Global);
394  //NOTE: linkonce is handled by the section the symbol was assigned to.
395  } else {
396  // .weak _foo
397  OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Weak);
398  }
399  return;
401  // If external, declare as a global symbol: .globl _foo
402  OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Global);
403  return;
406  return;
410  llvm_unreachable("Should never emit this");
411  }
412  llvm_unreachable("Unknown linkage type!");
413 }
414 
416  const GlobalValue *GV) const {
417  TM.getNameWithPrefix(Name, GV, getObjFileLowering().getMangler());
418 }
419 
421  return TM.getSymbol(GV);
422 }
423 
424 /// EmitGlobalVariable - Emit the specified global variable to the .s file.
426  bool IsEmuTLSVar = TM.Options.EmulatedTLS && GV->isThreadLocal();
427  assert(!(IsEmuTLSVar && GV->hasCommonLinkage()) &&
428  "No emulated TLS variables in the common section");
429 
430  // Never emit TLS variable xyz in emulated TLS model.
431  // The initialization value is in __emutls_t.xyz instead of xyz.
432  if (IsEmuTLSVar)
433  return;
434 
435  if (GV->hasInitializer()) {
436  // Check to see if this is a special global used by LLVM, if so, emit it.
437  if (EmitSpecialLLVMGlobal(GV))
438  return;
439 
440  // Skip the emission of global equivalents. The symbol can be emitted later
441  // on by emitGlobalGOTEquivs in case it turns out to be needed.
442  if (GlobalGOTEquivs.count(getSymbol(GV)))
443  return;
444 
445  if (isVerbose()) {
446  // When printing the control variable __emutls_v.*,
447  // we don't need to print the original TLS variable name.
448  GV->printAsOperand(OutStreamer->GetCommentOS(),
449  /*PrintType=*/false, GV->getParent());
450  OutStreamer->GetCommentOS() << '\n';
451  }
452  }
453 
454  MCSymbol *GVSym = getSymbol(GV);
455  MCSymbol *EmittedSym = GVSym;
456 
457  // getOrCreateEmuTLSControlSym only creates the symbol with name and default
458  // attributes.
459  // GV's or GVSym's attributes will be used for the EmittedSym.
460  EmitVisibility(EmittedSym, GV->getVisibility(), !GV->isDeclaration());
461 
462  if (!GV->hasInitializer()) // External globals require no extra code.
463  return;
464 
465  GVSym->redefineIfPossible();
466  if (GVSym->isDefined() || GVSym->isVariable())
467  report_fatal_error("symbol '" + Twine(GVSym->getName()) +
468  "' is already defined");
469 
471  OutStreamer->EmitSymbolAttribute(EmittedSym, MCSA_ELF_TypeObject);
472 
474 
475  const DataLayout &DL = GV->getParent()->getDataLayout();
476  uint64_t Size = DL.getTypeAllocSize(GV->getType()->getElementType());
477 
478  // If the alignment is specified, we *must* obey it. Overaligning a global
479  // with a specified alignment is a prompt way to break globals emitted to
480  // sections and expected to be contiguous (e.g. ObjC metadata).
481  unsigned AlignLog = getGVAlignmentLog2(GV, DL);
482 
483  for (const HandlerInfo &HI : Handlers) {
484  NamedRegionTimer T(HI.TimerName, HI.TimerDescription,
485  HI.TimerGroupName, HI.TimerGroupDescription,
487  HI.Handler->setSymbolSize(GVSym, Size);
488  }
489 
490  // Handle common symbols
491  if (GVKind.isCommon()) {
492  if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
493  unsigned Align = 1 << AlignLog;
495  Align = 0;
496 
497  // .comm _foo, 42, 4
498  OutStreamer->EmitCommonSymbol(GVSym, Size, Align);
499  return;
500  }
501 
502  // Determine to which section this global should be emitted.
503  MCSection *TheSection = getObjFileLowering().SectionForGlobal(GV, GVKind, TM);
504 
505  // If we have a bss global going to a section that supports the
506  // zerofill directive, do so here.
507  if (GVKind.isBSS() && MAI->hasMachoZeroFillDirective() &&
508  TheSection->isVirtualSection()) {
509  if (Size == 0)
510  Size = 1; // zerofill of 0 bytes is undefined.
511  unsigned Align = 1 << AlignLog;
512  EmitLinkage(GV, GVSym);
513  // .zerofill __DATA, __bss, _foo, 400, 5
514  OutStreamer->EmitZerofill(TheSection, GVSym, Size, Align);
515  return;
516  }
517 
518  // If this is a BSS local symbol and we are emitting in the BSS
519  // section use .lcomm/.comm directive.
520  if (GVKind.isBSSLocal() &&
521  getObjFileLowering().getBSSSection() == TheSection) {
522  if (Size == 0)
523  Size = 1; // .comm Foo, 0 is undefined, avoid it.
524  unsigned Align = 1 << AlignLog;
525 
526  // Use .lcomm only if it supports user-specified alignment.
527  // Otherwise, while it would still be correct to use .lcomm in some
528  // cases (e.g. when Align == 1), the external assembler might enfore
529  // some -unknown- default alignment behavior, which could cause
530  // spurious differences between external and integrated assembler.
531  // Prefer to simply fall back to .local / .comm in this case.
533  // .lcomm _foo, 42
534  OutStreamer->EmitLocalCommonSymbol(GVSym, Size, Align);
535  return;
536  }
537 
538  if (!getObjFileLowering().getCommDirectiveSupportsAlignment())
539  Align = 0;
540 
541  // .local _foo
542  OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Local);
543  // .comm _foo, 42, 4
544  OutStreamer->EmitCommonSymbol(GVSym, Size, Align);
545  return;
546  }
547 
548  // Handle thread local data for mach-o which requires us to output an
549  // additional structure of data and mangle the original symbol so that we
550  // can reference it later.
551  //
552  // TODO: This should become an "emit thread local global" method on TLOF.
553  // All of this macho specific stuff should be sunk down into TLOFMachO and
554  // stuff like "TLSExtraDataSection" should no longer be part of the parent
555  // TLOF class. This will also make it more obvious that stuff like
556  // MCStreamer::EmitTBSSSymbol is macho specific and only called from macho
557  // specific code.
558  if (GVKind.isThreadLocal() && MAI->hasMachoTBSSDirective()) {
559  // Emit the .tbss symbol
560  MCSymbol *MangSym =
561  OutContext.getOrCreateSymbol(GVSym->getName() + Twine("$tlv$init"));
562 
563  if (GVKind.isThreadBSS()) {
564  TheSection = getObjFileLowering().getTLSBSSSection();
565  OutStreamer->EmitTBSSSymbol(TheSection, MangSym, Size, 1 << AlignLog);
566  } else if (GVKind.isThreadData()) {
567  OutStreamer->SwitchSection(TheSection);
568 
569  EmitAlignment(AlignLog, GV);
570  OutStreamer->EmitLabel(MangSym);
571 
573  GV->getInitializer());
574  }
575 
576  OutStreamer->AddBlankLine();
577 
578  // Emit the variable struct for the runtime.
580 
581  OutStreamer->SwitchSection(TLVSect);
582  // Emit the linkage here.
583  EmitLinkage(GV, GVSym);
584  OutStreamer->EmitLabel(GVSym);
585 
586  // Three pointers in size:
587  // - __tlv_bootstrap - used to make sure support exists
588  // - spare pointer, used when mapped by the runtime
589  // - pointer to mangled symbol above with initializer
590  unsigned PtrSize = DL.getPointerTypeSize(GV->getType());
591  OutStreamer->EmitSymbolValue(GetExternalSymbolSymbol("_tlv_bootstrap"),
592  PtrSize);
593  OutStreamer->EmitIntValue(0, PtrSize);
594  OutStreamer->EmitSymbolValue(MangSym, PtrSize);
595 
596  OutStreamer->AddBlankLine();
597  return;
598  }
599 
600  MCSymbol *EmittedInitSym = GVSym;
601 
602  OutStreamer->SwitchSection(TheSection);
603 
604  EmitLinkage(GV, EmittedInitSym);
605  EmitAlignment(AlignLog, GV);
606 
607  OutStreamer->EmitLabel(EmittedInitSym);
608 
610 
612  // .size foo, 42
613  OutStreamer->emitELFSize(EmittedInitSym,
615 
616  OutStreamer->AddBlankLine();
617 }
618 
619 /// Emit the directive and value for debug thread local expression
620 ///
621 /// \p Value - The value to emit.
622 /// \p Size - The size of the integer (in bytes) to emit.
624  unsigned Size) const {
625  OutStreamer->EmitValue(Value, Size);
626 }
627 
628 /// EmitFunctionHeader - This method emits the header for the current
629 /// function.
630 void AsmPrinter::EmitFunctionHeader() {
631  const Function *F = MF->getFunction();
632 
633  if (isVerbose())
634  OutStreamer->GetCommentOS()
635  << "-- Begin function "
637 
638  // Print out constants referenced by the function
640 
641  // Print the 'header' of function.
642  OutStreamer->SwitchSection(getObjFileLowering().SectionForGlobal(F, TM));
643  EmitVisibility(CurrentFnSym, F->getVisibility());
644 
645  EmitLinkage(F, CurrentFnSym);
646  if (MAI->hasFunctionAlignment())
648 
650  OutStreamer->EmitSymbolAttribute(CurrentFnSym, MCSA_ELF_TypeFunction);
651 
652  if (isVerbose()) {
653  F->printAsOperand(OutStreamer->GetCommentOS(),
654  /*PrintType=*/false, F->getParent());
655  OutStreamer->GetCommentOS() << '\n';
656  }
657 
658  // Emit the prefix data.
659  if (F->hasPrefixData()) {
660  if (MAI->hasSubsectionsViaSymbols()) {
661  // Preserving prefix data on platforms which use subsections-via-symbols
662  // is a bit tricky. Here we introduce a symbol for the prefix data
663  // and use the .alt_entry attribute to mark the function's real entry point
664  // as an alternative entry point to the prefix-data symbol.
666  OutStreamer->EmitLabel(PrefixSym);
667 
669 
670  // Emit an .alt_entry directive for the actual function symbol.
671  OutStreamer->EmitSymbolAttribute(CurrentFnSym, MCSA_AltEntry);
672  } else {
674  }
675  }
676 
677  // Emit the CurrentFnSym. This is a virtual function to allow targets to
678  // do their wild and crazy things as required.
680 
681  // If the function had address-taken blocks that got deleted, then we have
682  // references to the dangling symbols. Emit them at the start of the function
683  // so that we don't get references to undefined symbols.
684  std::vector<MCSymbol*> DeadBlockSyms;
685  MMI->takeDeletedSymbolsForFunction(F, DeadBlockSyms);
686  for (unsigned i = 0, e = DeadBlockSyms.size(); i != e; ++i) {
687  OutStreamer->AddComment("Address taken block that was later removed");
688  OutStreamer->EmitLabel(DeadBlockSyms[i]);
689  }
690 
691  if (CurrentFnBegin) {
692  if (MAI->useAssignmentForEHBegin()) {
694  OutStreamer->EmitLabel(CurPos);
695  OutStreamer->EmitAssignment(CurrentFnBegin,
697  } else {
698  OutStreamer->EmitLabel(CurrentFnBegin);
699  }
700  }
701 
702  // Emit pre-function debug and/or EH information.
703  for (const HandlerInfo &HI : Handlers) {
704  NamedRegionTimer T(HI.TimerName, HI.TimerDescription, HI.TimerGroupName,
705  HI.TimerGroupDescription, TimePassesIsEnabled);
706  HI.Handler->beginFunction(MF);
707  }
708 
709  // Emit the prologue data.
710  if (F->hasPrologueData())
712 }
713 
714 /// EmitFunctionEntryLabel - Emit the label that is the entrypoint for the
715 /// function. This can be overridden by targets as required to do custom stuff.
718 
719  // The function label could have already been emitted if two symbols end up
720  // conflicting due to asm renaming. Detect this and emit an error.
721  if (CurrentFnSym->isVariable())
723  "' is a protected alias");
724  if (CurrentFnSym->isDefined())
726  "' label emitted multiple times to assembly file");
727 
728  return OutStreamer->EmitLabel(CurrentFnSym);
729 }
730 
731 /// emitComments - Pretty-print comments for instructions.
732 static void emitComments(const MachineInstr &MI, raw_ostream &CommentOS,
733  AsmPrinter *AP) {
734  const MachineFunction *MF = MI.getParent()->getParent();
735  const TargetInstrInfo *TII = MF->getSubtarget().getInstrInfo();
736 
737  // Check for spills and reloads
738  int FI;
739 
740  const MachineFrameInfo &MFI = MF->getFrameInfo();
741  bool Commented = false;
742 
743  // We assume a single instruction only has a spill or reload, not
744  // both.
745  const MachineMemOperand *MMO;
746  if (TII->isLoadFromStackSlotPostFE(MI, FI)) {
747  if (MFI.isSpillSlotObjectIndex(FI)) {
748  MMO = *MI.memoperands_begin();
749  CommentOS << MMO->getSize() << "-byte Reload";
750  Commented = true;
751  }
752  } else if (TII->hasLoadFromStackSlot(MI, MMO, FI)) {
753  if (MFI.isSpillSlotObjectIndex(FI)) {
754  CommentOS << MMO->getSize() << "-byte Folded Reload";
755  Commented = true;
756  }
757  } else if (TII->isStoreToStackSlotPostFE(MI, FI)) {
758  if (MFI.isSpillSlotObjectIndex(FI)) {
759  MMO = *MI.memoperands_begin();
760  CommentOS << MMO->getSize() << "-byte Spill";
761  Commented = true;
762  }
763  } else if (TII->hasStoreToStackSlot(MI, MMO, FI)) {
764  if (MFI.isSpillSlotObjectIndex(FI)) {
765  CommentOS << MMO->getSize() << "-byte Folded Spill";
766  Commented = true;
767  }
768  }
769 
770  // Check for spill-induced copies
772  Commented = true;
773  CommentOS << " Reload Reuse";
774  }
775 
776  if (Commented && AP->EnablePrintSchedInfo)
777  // If any comment was added above and we need sched info comment then
778  // add this new comment just after the above comment w/o "\n" between them.
779  CommentOS << " " << MF->getSubtarget().getSchedInfoStr(MI) << "\n";
780  else if (Commented)
781  CommentOS << "\n";
782 }
783 
784 /// emitImplicitDef - This method emits the specified machine instruction
785 /// that is an implicit def.
787  unsigned RegNo = MI->getOperand(0).getReg();
788 
789  SmallString<128> Str;
790  raw_svector_ostream OS(Str);
791  OS << "implicit-def: "
792  << PrintReg(RegNo, MF->getSubtarget().getRegisterInfo());
793 
794  OutStreamer->AddComment(OS.str());
795  OutStreamer->AddBlankLine();
796 }
797 
798 static void emitKill(const MachineInstr *MI, AsmPrinter &AP) {
799  std::string Str;
800  raw_string_ostream OS(Str);
801  OS << "kill:";
802  for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
803  const MachineOperand &Op = MI->getOperand(i);
804  assert(Op.isReg() && "KILL instruction must have only register operands");
805  OS << ' '
806  << PrintReg(Op.getReg(),
808  << (Op.isDef() ? "<def>" : "<kill>");
809  }
810  AP.OutStreamer->AddComment(OS.str());
811  AP.OutStreamer->AddBlankLine();
812 }
813 
814 /// emitDebugValueComment - This method handles the target-independent form
815 /// of DBG_VALUE, returning true if it was able to do so. A false return
816 /// means the target will need to handle MI in EmitInstruction.
818  // This code handles only the 4-operand target-independent form.
819  if (MI->getNumOperands() != 4)
820  return false;
821 
822  SmallString<128> Str;
823  raw_svector_ostream OS(Str);
824  OS << "DEBUG_VALUE: ";
825 
826  const DILocalVariable *V = MI->getDebugVariable();
827  if (auto *SP = dyn_cast<DISubprogram>(V->getScope())) {
828  StringRef Name = SP->getName();
829  if (!Name.empty())
830  OS << Name << ":";
831  }
832  OS << V->getName();
833  OS << " <- ";
834 
835  // The second operand is only an offset if it's an immediate.
836  bool MemLoc = MI->getOperand(0).isReg() && MI->getOperand(1).isImm();
837  int64_t Offset = MemLoc ? MI->getOperand(1).getImm() : 0;
838  const DIExpression *Expr = MI->getDebugExpression();
839  if (Expr->getNumElements()) {
840  OS << '[';
841  bool NeedSep = false;
842  for (auto Op : Expr->expr_ops()) {
843  if (NeedSep)
844  OS << ", ";
845  else
846  NeedSep = true;
847  OS << dwarf::OperationEncodingString(Op.getOp());
848  for (unsigned I = 0; I < Op.getNumArgs(); ++I)
849  OS << ' ' << Op.getArg(I);
850  }
851  OS << "] ";
852  }
853 
854  // Register or immediate value. Register 0 means undef.
855  if (MI->getOperand(0).isFPImm()) {
856  APFloat APF = APFloat(MI->getOperand(0).getFPImm()->getValueAPF());
857  if (MI->getOperand(0).getFPImm()->getType()->isFloatTy()) {
858  OS << (double)APF.convertToFloat();
859  } else if (MI->getOperand(0).getFPImm()->getType()->isDoubleTy()) {
860  OS << APF.convertToDouble();
861  } else {
862  // There is no good way to print long double. Convert a copy to
863  // double. Ah well, it's only a comment.
864  bool ignored;
866  &ignored);
867  OS << "(long double) " << APF.convertToDouble();
868  }
869  } else if (MI->getOperand(0).isImm()) {
870  OS << MI->getOperand(0).getImm();
871  } else if (MI->getOperand(0).isCImm()) {
872  MI->getOperand(0).getCImm()->getValue().print(OS, false /*isSigned*/);
873  } else {
874  unsigned Reg;
875  if (MI->getOperand(0).isReg()) {
876  Reg = MI->getOperand(0).getReg();
877  } else {
878  assert(MI->getOperand(0).isFI() && "Unknown operand type");
880  Offset += TFI->getFrameIndexReference(*AP.MF,
881  MI->getOperand(0).getIndex(), Reg);
882  MemLoc = true;
883  }
884  if (Reg == 0) {
885  // Suppress offset, it is not meaningful here.
886  OS << "undef";
887  // NOTE: Want this comment at start of line, don't emit with AddComment.
888  AP.OutStreamer->emitRawComment(OS.str());
889  return true;
890  }
891  if (MemLoc)
892  OS << '[';
893  OS << PrintReg(Reg, AP.MF->getSubtarget().getRegisterInfo());
894  }
895 
896  if (MemLoc)
897  OS << '+' << Offset << ']';
898 
899  // NOTE: Want this comment at start of line, don't emit with AddComment.
900  AP.OutStreamer->emitRawComment(OS.str());
901  return true;
902 }
903 
907  return CFI_M_EH;
908 
909  if (MMI->hasDebugInfo())
910  return CFI_M_Debug;
911 
912  return CFI_M_None;
913 }
914 
917 }
918 
920  ExceptionHandling ExceptionHandlingType = MAI->getExceptionHandlingType();
921  if (ExceptionHandlingType != ExceptionHandling::DwarfCFI &&
922  ExceptionHandlingType != ExceptionHandling::ARM)
923  return;
924 
925  if (needsCFIMoves() == CFI_M_None)
926  return;
927 
928  // If there is no "real" instruction following this CFI instruction, skip
929  // emitting it; it would be beyond the end of the function's FDE range.
930  auto *MBB = MI.getParent();
931  auto I = std::next(MI.getIterator());
932  while (I != MBB->end() && I->isTransient())
933  ++I;
934  if (I == MBB->instr_end() &&
935  MBB->getReverseIterator() == MBB->getParent()->rbegin())
936  return;
937 
938  const std::vector<MCCFIInstruction> &Instrs = MF->getFrameInstructions();
939  unsigned CFIIndex = MI.getOperand(0).getCFIIndex();
940  const MCCFIInstruction &CFI = Instrs[CFIIndex];
941  emitCFIInstruction(CFI);
942 }
943 
945  // The operands are the MCSymbol and the frame offset of the allocation.
946  MCSymbol *FrameAllocSym = MI.getOperand(0).getMCSymbol();
947  int FrameOffset = MI.getOperand(1).getImm();
948 
949  // Emit a symbol assignment.
950  OutStreamer->EmitAssignment(FrameAllocSym,
951  MCConstantExpr::create(FrameOffset, OutContext));
952 }
953 
956  if (!MF.getLandingPads().empty() || MF.hasEHFunclets() || MMI->hasDebugInfo())
957  return true;
958 
959  // We might emit an EH table that uses function begin and end labels even if
960  // we don't have any landingpads.
961  if (!MF.getFunction()->hasPersonalityFn())
962  return false;
963  return !isNoOpWithoutInvoke(
965 }
966 
967 /// EmitFunctionBody - This method emits the body and trailer for a
968 /// function.
970  EmitFunctionHeader();
971 
972  // Emit target-specific gunk before the function body.
974 
975  bool ShouldPrintDebugScopes = MMI->hasDebugInfo();
976 
977  // Print out code for the function.
978  bool HasAnyRealCode = false;
979  int NumInstsInFunction = 0;
980  for (auto &MBB : *MF) {
981  // Print a label for the basic block.
982  EmitBasicBlockStart(MBB);
983  for (auto &MI : MBB) {
984 
985  // Print the assembly for the instruction.
986  if (!MI.isPosition() && !MI.isImplicitDef() && !MI.isKill() &&
987  !MI.isDebugValue()) {
988  HasAnyRealCode = true;
989  ++NumInstsInFunction;
990  }
991 
992  if (ShouldPrintDebugScopes) {
993  for (const HandlerInfo &HI : Handlers) {
994  NamedRegionTimer T(HI.TimerName, HI.TimerDescription,
995  HI.TimerGroupName, HI.TimerGroupDescription,
997  HI.Handler->beginInstruction(&MI);
998  }
999  }
1000 
1001  if (isVerbose())
1002  emitComments(MI, OutStreamer->GetCommentOS(), this);
1003 
1004  switch (MI.getOpcode()) {
1005  case TargetOpcode::CFI_INSTRUCTION:
1007  break;
1008 
1009  case TargetOpcode::LOCAL_ESCAPE:
1010  emitFrameAlloc(MI);
1011  break;
1012 
1014  case TargetOpcode::GC_LABEL:
1015  OutStreamer->EmitLabel(MI.getOperand(0).getMCSymbol());
1016  break;
1018  EmitInlineAsm(&MI);
1019  break;
1020  case TargetOpcode::DBG_VALUE:
1021  if (isVerbose()) {
1022  if (!emitDebugValueComment(&MI, *this))
1023  EmitInstruction(&MI);
1024  }
1025  break;
1026  case TargetOpcode::IMPLICIT_DEF:
1027  if (isVerbose()) emitImplicitDef(&MI);
1028  break;
1029  case TargetOpcode::KILL:
1030  if (isVerbose()) emitKill(&MI, *this);
1031  break;
1032  default:
1033  EmitInstruction(&MI);
1034  break;
1035  }
1036 
1037  if (ShouldPrintDebugScopes) {
1038  for (const HandlerInfo &HI : Handlers) {
1039  NamedRegionTimer T(HI.TimerName, HI.TimerDescription,
1040  HI.TimerGroupName, HI.TimerGroupDescription,
1042  HI.Handler->endInstruction();
1043  }
1044  }
1045  }
1046 
1047  EmitBasicBlockEnd(MBB);
1048  }
1049 
1050  EmittedInsts += NumInstsInFunction;
1051  MachineOptimizationRemarkAnalysis R(DEBUG_TYPE, "InstructionCount",
1052  MF->getFunction()->getSubprogram(),
1053  &MF->front());
1054  R << ore::NV("NumInstructions", NumInstsInFunction)
1055  << " instructions in function";
1056  ORE->emit(R);
1057 
1058  // If the function is empty and the object file uses .subsections_via_symbols,
1059  // then we need to emit *something* to the function body to prevent the
1060  // labels from collapsing together. Just emit a noop.
1061  // Similarly, don't emit empty functions on Windows either. It can lead to
1062  // duplicate entries (two functions with the same RVA) in the Guard CF Table
1063  // after linking, causing the kernel not to load the binary:
1064  // https://developercommunity.visualstudio.com/content/problem/45366/vc-linker-creates-invalid-dll-with-clang-cl.html
1065  // FIXME: Hide this behind some API in e.g. MCAsmInfo or MCTargetStreamer.
1066  const Triple &TT = TM.getTargetTriple();
1067  if (!HasAnyRealCode && (MAI->hasSubsectionsViaSymbols() ||
1068  (TT.isOSWindows() && TT.isOSBinFormatCOFF()))) {
1069  MCInst Noop;
1070  MF->getSubtarget().getInstrInfo()->getNoop(Noop);
1071 
1072  // Targets can opt-out of emitting the noop here by leaving the opcode
1073  // unspecified.
1074  if (Noop.getOpcode()) {
1075  OutStreamer->AddComment("avoids zero-length function");
1076  OutStreamer->EmitInstruction(Noop, getSubtargetInfo());
1077  }
1078  }
1079 
1080  const Function *F = MF->getFunction();
1081  for (const auto &BB : *F) {
1082  if (!BB.hasAddressTaken())
1083  continue;
1084  MCSymbol *Sym = GetBlockAddressSymbol(&BB);
1085  if (Sym->isDefined())
1086  continue;
1087  OutStreamer->AddComment("Address of block that was removed by CodeGen");
1088  OutStreamer->EmitLabel(Sym);
1089  }
1090 
1091  // Emit target-specific gunk after the function body.
1093 
1094  if (needFuncLabelsForEHOrDebugInfo(*MF, MMI) ||
1096  // Create a symbol for the end of function.
1097  CurrentFnEnd = createTempSymbol("func_end");
1098  OutStreamer->EmitLabel(CurrentFnEnd);
1099  }
1100 
1101  // If the target wants a .size directive for the size of the function, emit
1102  // it.
1104  // We can get the size as difference between the function label and the
1105  // temp label.
1106  const MCExpr *SizeExp = MCBinaryExpr::createSub(
1107  MCSymbolRefExpr::create(CurrentFnEnd, OutContext),
1109  OutStreamer->emitELFSize(CurrentFnSym, SizeExp);
1110  }
1111 
1112  for (const HandlerInfo &HI : Handlers) {
1113  NamedRegionTimer T(HI.TimerName, HI.TimerDescription, HI.TimerGroupName,
1114  HI.TimerGroupDescription, TimePassesIsEnabled);
1115  HI.Handler->markFunctionEnd();
1116  }
1117 
1118  // Print out jump tables referenced by the function.
1120 
1121  // Emit post-function debug and/or EH information.
1122  for (const HandlerInfo &HI : Handlers) {
1123  NamedRegionTimer T(HI.TimerName, HI.TimerDescription, HI.TimerGroupName,
1124  HI.TimerGroupDescription, TimePassesIsEnabled);
1125  HI.Handler->endFunction(MF);
1126  }
1127 
1128  if (isVerbose())
1129  OutStreamer->GetCommentOS() << "-- End function\n";
1130 
1131  OutStreamer->AddBlankLine();
1132 }
1133 
1134 /// \brief Compute the number of Global Variables that uses a Constant.
1135 static unsigned getNumGlobalVariableUses(const Constant *C) {
1136  if (!C)
1137  return 0;
1138 
1139  if (isa<GlobalVariable>(C))
1140  return 1;
1141 
1142  unsigned NumUses = 0;
1143  for (auto *CU : C->users())
1144  NumUses += getNumGlobalVariableUses(dyn_cast<Constant>(CU));
1145 
1146  return NumUses;
1147 }
1148 
1149 /// \brief Only consider global GOT equivalents if at least one user is a
1150 /// cstexpr inside an initializer of another global variables. Also, don't
1151 /// handle cstexpr inside instructions. During global variable emission,
1152 /// candidates are skipped and are emitted later in case at least one cstexpr
1153 /// isn't replaced by a PC relative GOT entry access.
1155  unsigned &NumGOTEquivUsers) {
1156  // Global GOT equivalents are unnamed private globals with a constant
1157  // pointer initializer to another global symbol. They must point to a
1158  // GlobalVariable or Function, i.e., as GlobalValue.
1159  if (!GV->hasGlobalUnnamedAddr() || !GV->hasInitializer() ||
1160  !GV->isConstant() || !GV->isDiscardableIfUnused() ||
1161  !dyn_cast<GlobalValue>(GV->getOperand(0)))
1162  return false;
1163 
1164  // To be a got equivalent, at least one of its users need to be a constant
1165  // expression used by another global variable.
1166  for (auto *U : GV->users())
1167  NumGOTEquivUsers += getNumGlobalVariableUses(dyn_cast<Constant>(U));
1168 
1169  return NumGOTEquivUsers > 0;
1170 }
1171 
1172 /// \brief Unnamed constant global variables solely contaning a pointer to
1173 /// another globals variable is equivalent to a GOT table entry; it contains the
1174 /// the address of another symbol. Optimize it and replace accesses to these
1175 /// "GOT equivalents" by using the GOT entry for the final global instead.
1176 /// Compute GOT equivalent candidates among all global variables to avoid
1177 /// emitting them if possible later on, after it use is replaced by a GOT entry
1178 /// access.
1180  if (!getObjFileLowering().supportIndirectSymViaGOTPCRel())
1181  return;
1182 
1183  for (const auto &G : M.globals()) {
1184  unsigned NumGOTEquivUsers = 0;
1185  if (!isGOTEquivalentCandidate(&G, NumGOTEquivUsers))
1186  continue;
1187 
1188  const MCSymbol *GOTEquivSym = getSymbol(&G);
1189  GlobalGOTEquivs[GOTEquivSym] = std::make_pair(&G, NumGOTEquivUsers);
1190  }
1191 }
1192 
1193 /// \brief Constant expressions using GOT equivalent globals may not be eligible
1194 /// for PC relative GOT entry conversion, in such cases we need to emit such
1195 /// globals we previously omitted in EmitGlobalVariable.
1197  if (!getObjFileLowering().supportIndirectSymViaGOTPCRel())
1198  return;
1199 
1200  SmallVector<const GlobalVariable *, 8> FailedCandidates;
1201  for (auto &I : GlobalGOTEquivs) {
1202  const GlobalVariable *GV = I.second.first;
1203  unsigned Cnt = I.second.second;
1204  if (Cnt)
1205  FailedCandidates.push_back(GV);
1206  }
1207  GlobalGOTEquivs.clear();
1208 
1209  for (auto *GV : FailedCandidates)
1210  EmitGlobalVariable(GV);
1211 }
1212 
1213 void AsmPrinter::emitGlobalIndirectSymbol(Module &M,
1214  const GlobalIndirectSymbol& GIS) {
1215  MCSymbol *Name = getSymbol(&GIS);
1216 
1217  if (GIS.hasExternalLinkage() || !MAI->getWeakRefDirective())
1218  OutStreamer->EmitSymbolAttribute(Name, MCSA_Global);
1219  else if (GIS.hasWeakLinkage() || GIS.hasLinkOnceLinkage())
1220  OutStreamer->EmitSymbolAttribute(Name, MCSA_WeakReference);
1221  else
1222  assert(GIS.hasLocalLinkage() && "Invalid alias or ifunc linkage");
1223 
1224  // Set the symbol type to function if the alias has a function type.
1225  // This affects codegen when the aliasee is not a function.
1226  if (GIS.getType()->getPointerElementType()->isFunctionTy()) {
1227  OutStreamer->EmitSymbolAttribute(Name, MCSA_ELF_TypeFunction);
1228  if (isa<GlobalIFunc>(GIS))
1229  OutStreamer->EmitSymbolAttribute(Name, MCSA_ELF_TypeIndFunction);
1230  }
1231 
1232  EmitVisibility(Name, GIS.getVisibility());
1233 
1234  const MCExpr *Expr = lowerConstant(GIS.getIndirectSymbol());
1235 
1236  if (isa<GlobalAlias>(&GIS) && MAI->hasAltEntry() && isa<MCBinaryExpr>(Expr))
1237  OutStreamer->EmitSymbolAttribute(Name, MCSA_AltEntry);
1238 
1239  // Emit the directives as assignments aka .set:
1240  OutStreamer->EmitAssignment(Name, Expr);
1241 
1242  if (auto *GA = dyn_cast<GlobalAlias>(&GIS)) {
1243  // If the aliasee does not correspond to a symbol in the output, i.e. the
1244  // alias is not of an object or the aliased object is private, then set the
1245  // size of the alias symbol from the type of the alias. We don't do this in
1246  // other situations as the alias and aliasee having differing types but same
1247  // size may be intentional.
1248  const GlobalObject *BaseObject = GA->getBaseObject();
1249  if (MAI->hasDotTypeDotSizeDirective() && GA->getValueType()->isSized() &&
1250  (!BaseObject || BaseObject->hasPrivateLinkage())) {
1251  const DataLayout &DL = M.getDataLayout();
1252  uint64_t Size = DL.getTypeAllocSize(GA->getValueType());
1253  OutStreamer->emitELFSize(Name, MCConstantExpr::create(Size, OutContext));
1254  }
1255  }
1256 }
1257 
1259  // Set the MachineFunction to nullptr so that we can catch attempted
1260  // accesses to MF specific features at the module level and so that
1261  // we can conditionalize accesses based on whether or not it is nullptr.
1262  MF = nullptr;
1263 
1264  // Gather all GOT equivalent globals in the module. We really need two
1265  // passes over the globals: one to compute and another to avoid its emission
1266  // in EmitGlobalVariable, otherwise we would not be able to handle cases
1267  // where the got equivalent shows up before its use.
1269 
1270  // Emit global variables.
1271  for (const auto &G : M.globals())
1273 
1274  // Emit remaining GOT equivalent globals.
1276 
1277  // Emit visibility info for declarations
1278  for (const Function &F : M) {
1279  if (!F.isDeclarationForLinker())
1280  continue;
1281  GlobalValue::VisibilityTypes V = F.getVisibility();
1283  continue;
1284 
1285  MCSymbol *Name = getSymbol(&F);
1286  EmitVisibility(Name, V, false);
1287  }
1288 
1290 
1291  TLOF.emitModuleMetadata(*OutStreamer, M, TM);
1292 
1295 
1296  // Output stubs for external and common global variables.
1298  if (!Stubs.empty()) {
1299  OutStreamer->SwitchSection(TLOF.getDataSection());
1300  const DataLayout &DL = M.getDataLayout();
1301 
1302  for (const auto &Stub : Stubs) {
1303  OutStreamer->EmitLabel(Stub.first);
1304  OutStreamer->EmitSymbolValue(Stub.second.getPointer(),
1305  DL.getPointerSize());
1306  }
1307  }
1308  }
1309 
1310  // Finalize debug and EH information.
1311  for (const HandlerInfo &HI : Handlers) {
1312  NamedRegionTimer T(HI.TimerName, HI.TimerDescription, HI.TimerGroupName,
1313  HI.TimerGroupDescription, TimePassesIsEnabled);
1314  HI.Handler->endModule();
1315  delete HI.Handler;
1316  }
1317  Handlers.clear();
1318  DD = nullptr;
1319 
1320  // If the target wants to know about weak references, print them all.
1321  if (MAI->getWeakRefDirective()) {
1322  // FIXME: This is not lazy, it would be nice to only print weak references
1323  // to stuff that is actually used. Note that doing so would require targets
1324  // to notice uses in operands (due to constant exprs etc). This should
1325  // happen with the MC stuff eventually.
1326 
1327  // Print out module-level global objects here.
1328  for (const auto &GO : M.global_objects()) {
1329  if (!GO.hasExternalWeakLinkage())
1330  continue;
1331  OutStreamer->EmitSymbolAttribute(getSymbol(&GO), MCSA_WeakReference);
1332  }
1333  }
1334 
1335  OutStreamer->AddBlankLine();
1336 
1337  // Print aliases in topological order, that is, for each alias a = b,
1338  // b must be printed before a.
1339  // This is because on some targets (e.g. PowerPC) linker expects aliases in
1340  // such an order to generate correct TOC information.
1343  for (const auto &Alias : M.aliases()) {
1344  for (const GlobalAlias *Cur = &Alias; Cur;
1345  Cur = dyn_cast<GlobalAlias>(Cur->getAliasee())) {
1346  if (!AliasVisited.insert(Cur).second)
1347  break;
1348  AliasStack.push_back(Cur);
1349  }
1350  for (const GlobalAlias *AncestorAlias : llvm::reverse(AliasStack))
1351  emitGlobalIndirectSymbol(M, *AncestorAlias);
1352  AliasStack.clear();
1353  }
1354  for (const auto &IFunc : M.ifuncs())
1355  emitGlobalIndirectSymbol(M, IFunc);
1356 
1357  GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
1358  assert(MI && "AsmPrinter didn't require GCModuleInfo?");
1359  for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; )
1360  if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(**--I))
1361  MP->finishAssembly(M, *MI, *this);
1362 
1363  // Emit llvm.ident metadata in an '.ident' directive.
1364  EmitModuleIdents(M);
1365 
1366  // Emit __morestack address if needed for indirect calls.
1367  if (MMI->usesMorestackAddr()) {
1368  unsigned Align = 1;
1369  MCSection *ReadOnlySection = getObjFileLowering().getSectionForConstant(
1371  /*C=*/nullptr, Align);
1372  OutStreamer->SwitchSection(ReadOnlySection);
1373 
1374  MCSymbol *AddrSymbol =
1375  OutContext.getOrCreateSymbol(StringRef("__morestack_addr"));
1376  OutStreamer->EmitLabel(AddrSymbol);
1377 
1378  unsigned PtrSize = MAI->getCodePointerSize();
1379  OutStreamer->EmitSymbolValue(GetExternalSymbolSymbol("__morestack"),
1380  PtrSize);
1381  }
1382 
1383  // If we don't have any trampolines, then we don't require stack memory
1384  // to be executable. Some targets have a directive to declare this.
1385  Function *InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline");
1386  if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty())
1388  OutStreamer->SwitchSection(S);
1389 
1390  // Allow the target to emit any magic that it wants at the end of the file,
1391  // after everything else has gone out.
1392  EmitEndOfAsmFile(M);
1393 
1394  MMI = nullptr;
1395 
1396  OutStreamer->Finish();
1397  OutStreamer->reset();
1398 
1399  return false;
1400 }
1401 
1403  if (!CurExceptionSym)
1404  CurExceptionSym = createTempSymbol("exception");
1405  return CurExceptionSym;
1406 }
1407 
1409  this->MF = &MF;
1410  // Get the function symbol.
1413  CurrentFnBegin = nullptr;
1414  CurExceptionSym = nullptr;
1415  bool NeedsLocalForSize = MAI->needsLocalForSize();
1416  if (needFuncLabelsForEHOrDebugInfo(MF, MMI) || NeedsLocalForSize) {
1417  CurrentFnBegin = createTempSymbol("func_begin");
1418  if (NeedsLocalForSize)
1419  CurrentFnSymForSize = CurrentFnBegin;
1420  }
1421 
1422  ORE = &getAnalysis<MachineOptimizationRemarkEmitterPass>().getORE();
1423  if (isVerbose())
1424  LI = &getAnalysis<MachineLoopInfo>();
1425 
1426  const TargetSubtargetInfo &STI = MF.getSubtarget();
1427  EnablePrintSchedInfo = PrintSchedule.getNumOccurrences()
1428  ? PrintSchedule
1429  : STI.supportPrintSchedInfo();
1430 }
1431 
1432 namespace {
1433 
1434 // Keep track the alignment, constpool entries per Section.
1435  struct SectionCPs {
1436  MCSection *S;
1437  unsigned Alignment;
1439 
1440  SectionCPs(MCSection *s, unsigned a) : S(s), Alignment(a) {}
1441  };
1442 
1443 } // end anonymous namespace
1444 
1445 /// EmitConstantPool - Print to the current output stream assembly
1446 /// representations of the constants in the constant pool MCP. This is
1447 /// used to print out constants which have been "spilled to memory" by
1448 /// the code generator.
1449 ///
1451  const MachineConstantPool *MCP = MF->getConstantPool();
1452  const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
1453  if (CP.empty()) return;
1454 
1455  // Calculate sections for constant pool entries. We collect entries to go into
1456  // the same section together to reduce amount of section switch statements.
1457  SmallVector<SectionCPs, 4> CPSections;
1458  for (unsigned i = 0, e = CP.size(); i != e; ++i) {
1459  const MachineConstantPoolEntry &CPE = CP[i];
1460  unsigned Align = CPE.getAlignment();
1461 
1462  SectionKind Kind = CPE.getSectionKind(&getDataLayout());
1463 
1464  const Constant *C = nullptr;
1465  if (!CPE.isMachineConstantPoolEntry())
1466  C = CPE.Val.ConstVal;
1467 
1469  Kind, C, Align);
1470 
1471  // The number of sections are small, just do a linear search from the
1472  // last section to the first.
1473  bool Found = false;
1474  unsigned SecIdx = CPSections.size();
1475  while (SecIdx != 0) {
1476  if (CPSections[--SecIdx].S == S) {
1477  Found = true;
1478  break;
1479  }
1480  }
1481  if (!Found) {
1482  SecIdx = CPSections.size();
1483  CPSections.push_back(SectionCPs(S, Align));
1484  }
1485 
1486  if (Align > CPSections[SecIdx].Alignment)
1487  CPSections[SecIdx].Alignment = Align;
1488  CPSections[SecIdx].CPEs.push_back(i);
1489  }
1490 
1491  // Now print stuff into the calculated sections.
1492  const MCSection *CurSection = nullptr;
1493  unsigned Offset = 0;
1494  for (unsigned i = 0, e = CPSections.size(); i != e; ++i) {
1495  for (unsigned j = 0, ee = CPSections[i].CPEs.size(); j != ee; ++j) {
1496  unsigned CPI = CPSections[i].CPEs[j];
1497  MCSymbol *Sym = GetCPISymbol(CPI);
1498  if (!Sym->isUndefined())
1499  continue;
1500 
1501  if (CurSection != CPSections[i].S) {
1502  OutStreamer->SwitchSection(CPSections[i].S);
1503  EmitAlignment(Log2_32(CPSections[i].Alignment));
1504  CurSection = CPSections[i].S;
1505  Offset = 0;
1506  }
1507 
1508  MachineConstantPoolEntry CPE = CP[CPI];
1509 
1510  // Emit inter-object padding for alignment.
1511  unsigned AlignMask = CPE.getAlignment() - 1;
1512  unsigned NewOffset = (Offset + AlignMask) & ~AlignMask;
1513  OutStreamer->EmitZeros(NewOffset - Offset);
1514 
1515  Type *Ty = CPE.getType();
1516  Offset = NewOffset + getDataLayout().getTypeAllocSize(Ty);
1517 
1518  OutStreamer->EmitLabel(Sym);
1519  if (CPE.isMachineConstantPoolEntry())
1521  else
1523  }
1524  }
1525 }
1526 
1527 /// EmitJumpTableInfo - Print assembly representations of the jump tables used
1528 /// by the current function to the current output stream.
1529 ///
1531  const DataLayout &DL = MF->getDataLayout();
1532  const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo();
1533  if (!MJTI) return;
1534  if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_Inline) return;
1535  const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
1536  if (JT.empty()) return;
1537 
1538  // Pick the directive to use to print the jump table entries, and switch to
1539  // the appropriate section.
1540  const Function *F = MF->getFunction();
1542  bool JTInDiffSection = !TLOF.shouldPutJumpTableInFunctionSection(
1544  *F);
1545  if (JTInDiffSection) {
1546  // Drop it in the readonly section.
1547  MCSection *ReadOnlySection = TLOF.getSectionForJumpTable(*F, TM);
1548  OutStreamer->SwitchSection(ReadOnlySection);
1549  }
1550 
1552 
1553  // Jump tables in code sections are marked with a data_region directive
1554  // where that's supported.
1555  if (!JTInDiffSection)
1556  OutStreamer->EmitDataRegion(MCDR_DataRegionJT32);
1557 
1558  for (unsigned JTI = 0, e = JT.size(); JTI != e; ++JTI) {
1559  const std::vector<MachineBasicBlock*> &JTBBs = JT[JTI].MBBs;
1560 
1561  // If this jump table was deleted, ignore it.
1562  if (JTBBs.empty()) continue;
1563 
1564  // For the EK_LabelDifference32 entry, if using .set avoids a relocation,
1565  /// emit a .set directive for each unique entry.
1569  const TargetLowering *TLI = MF->getSubtarget().getTargetLowering();
1571  for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
1572  const MachineBasicBlock *MBB = JTBBs[ii];
1573  if (!EmittedSets.insert(MBB).second)
1574  continue;
1575 
1576  // .set LJTSet, LBB32-base
1577  const MCExpr *LHS =
1579  OutStreamer->EmitAssignment(GetJTSetSymbol(JTI, MBB->getNumber()),
1580  MCBinaryExpr::createSub(LHS, Base,
1581  OutContext));
1582  }
1583  }
1584 
1585  // On some targets (e.g. Darwin) we want to emit two consecutive labels
1586  // before each jump table. The first label is never referenced, but tells
1587  // the assembler and linker the extents of the jump table object. The
1588  // second label is actually referenced by the code.
1589  if (JTInDiffSection && DL.hasLinkerPrivateGlobalPrefix())
1590  // FIXME: This doesn't have to have any specific name, just any randomly
1591  // named and numbered 'l' label would work. Simplify GetJTISymbol.
1592  OutStreamer->EmitLabel(GetJTISymbol(JTI, true));
1593 
1594  OutStreamer->EmitLabel(GetJTISymbol(JTI));
1595 
1596  for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
1597  EmitJumpTableEntry(MJTI, JTBBs[ii], JTI);
1598  }
1599  if (!JTInDiffSection)
1600  OutStreamer->EmitDataRegion(MCDR_DataRegionEnd);
1601 }
1602 
1603 /// EmitJumpTableEntry - Emit a jump table entry for the specified MBB to the
1604 /// current stream.
1605 void AsmPrinter::EmitJumpTableEntry(const MachineJumpTableInfo *MJTI,
1606  const MachineBasicBlock *MBB,
1607  unsigned UID) const {
1608  assert(MBB && MBB->getNumber() >= 0 && "Invalid basic block");
1609  const MCExpr *Value = nullptr;
1610  switch (MJTI->getEntryKind()) {
1612  llvm_unreachable("Cannot emit EK_Inline jump table entry");
1615  MJTI, MBB, UID, OutContext);
1616  break;
1618  // EK_BlockAddress - Each entry is a plain address of block, e.g.:
1619  // .word LBB123
1620  Value = MCSymbolRefExpr::create(MBB->getSymbol(), OutContext);
1621  break;
1623  // EK_GPRel32BlockAddress - Each entry is an address of block, encoded
1624  // with a relocation as gp-relative, e.g.:
1625  // .gprel32 LBB123
1626  MCSymbol *MBBSym = MBB->getSymbol();
1627  OutStreamer->EmitGPRel32Value(MCSymbolRefExpr::create(MBBSym, OutContext));
1628  return;
1629  }
1630 
1632  // EK_GPRel64BlockAddress - Each entry is an address of block, encoded
1633  // with a relocation as gp-relative, e.g.:
1634  // .gpdword LBB123
1635  MCSymbol *MBBSym = MBB->getSymbol();
1636  OutStreamer->EmitGPRel64Value(MCSymbolRefExpr::create(MBBSym, OutContext));
1637  return;
1638  }
1639 
1641  // Each entry is the address of the block minus the address of the jump
1642  // table. This is used for PIC jump tables where gprel32 is not supported.
1643  // e.g.:
1644  // .word LBB123 - LJTI1_2
1645  // If the .set directive avoids relocations, this is emitted as:
1646  // .set L4_5_set_123, LBB123 - LJTI1_2
1647  // .word L4_5_set_123
1649  Value = MCSymbolRefExpr::create(GetJTSetSymbol(UID, MBB->getNumber()),
1650  OutContext);
1651  break;
1652  }
1653  Value = MCSymbolRefExpr::create(MBB->getSymbol(), OutContext);
1654  const TargetLowering *TLI = MF->getSubtarget().getTargetLowering();
1655  const MCExpr *Base = TLI->getPICJumpTableRelocBaseExpr(MF, UID, OutContext);
1656  Value = MCBinaryExpr::createSub(Value, Base, OutContext);
1657  break;
1658  }
1659  }
1660 
1661  assert(Value && "Unknown entry kind!");
1662 
1663  unsigned EntrySize = MJTI->getEntrySize(getDataLayout());
1664  OutStreamer->EmitValue(Value, EntrySize);
1665 }
1666 
1667 /// EmitSpecialLLVMGlobal - Check to see if the specified global is a
1668 /// special global used by LLVM. If so, emit it and return true, otherwise
1669 /// do nothing and return false.
1671  if (GV->getName() == "llvm.used") {
1672  if (MAI->hasNoDeadStrip()) // No need to emit this at all.
1673  EmitLLVMUsedList(cast<ConstantArray>(GV->getInitializer()));
1674  return true;
1675  }
1676 
1677  // Ignore debug and non-emitted data. This handles llvm.compiler.used.
1678  if (GV->getSection() == "llvm.metadata" ||
1680  return true;
1681 
1682  if (!GV->hasAppendingLinkage()) return false;
1683 
1684  assert(GV->hasInitializer() && "Not a special LLVM global!");
1685 
1686  if (GV->getName() == "llvm.global_ctors") {
1687  EmitXXStructorList(GV->getParent()->getDataLayout(), GV->getInitializer(),
1688  /* isCtor */ true);
1689 
1690  return true;
1691  }
1692 
1693  if (GV->getName() == "llvm.global_dtors") {
1694  EmitXXStructorList(GV->getParent()->getDataLayout(), GV->getInitializer(),
1695  /* isCtor */ false);
1696 
1697  return true;
1698  }
1699 
1700  report_fatal_error("unknown special variable");
1701 }
1702 
1703 /// EmitLLVMUsedList - For targets that define a MAI::UsedDirective, mark each
1704 /// global in the specified llvm.used list for which emitUsedDirectiveFor
1705 /// is true, as being used with this directive.
1706 void AsmPrinter::EmitLLVMUsedList(const ConstantArray *InitList) {
1707  // Should be an array of 'i8*'.
1708  for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
1709  const GlobalValue *GV =
1711  if (GV)
1712  OutStreamer->EmitSymbolAttribute(getSymbol(GV), MCSA_NoDeadStrip);
1713  }
1714 }
1715 
1716 namespace {
1717 
1718 struct Structor {
1719  int Priority = 0;
1720  Constant *Func = nullptr;
1721  GlobalValue *ComdatKey = nullptr;
1722 
1723  Structor() = default;
1724 };
1725 
1726 } // end anonymous namespace
1727 
1728 /// EmitXXStructorList - Emit the ctor or dtor list taking into account the init
1729 /// priority.
1730 void AsmPrinter::EmitXXStructorList(const DataLayout &DL, const Constant *List,
1731  bool isCtor) {
1732  // Should be an array of '{ int, void ()* }' structs. The first value is the
1733  // init priority.
1734  if (!isa<ConstantArray>(List)) return;
1735 
1736  // Sanity check the structors list.
1737  const ConstantArray *InitList = dyn_cast<ConstantArray>(List);
1738  if (!InitList) return; // Not an array!
1739  StructType *ETy = dyn_cast<StructType>(InitList->getType()->getElementType());
1740  // FIXME: Only allow the 3-field form in LLVM 4.0.
1741  if (!ETy || ETy->getNumElements() < 2 || ETy->getNumElements() > 3)
1742  return; // Not an array of two or three elements!
1743  if (!isa<IntegerType>(ETy->getTypeAtIndex(0U)) ||
1744  !isa<PointerType>(ETy->getTypeAtIndex(1U))) return; // Not (int, ptr).
1745  if (ETy->getNumElements() == 3 && !isa<PointerType>(ETy->getTypeAtIndex(2U)))
1746  return; // Not (int, ptr, ptr).
1747 
1748  // Gather the structors in a form that's convenient for sorting by priority.
1749  SmallVector<Structor, 8> Structors;
1750  for (Value *O : InitList->operands()) {
1752  if (!CS) continue; // Malformed.
1753  if (CS->getOperand(1)->isNullValue())
1754  break; // Found a null terminator, skip the rest.
1755  ConstantInt *Priority = dyn_cast<ConstantInt>(CS->getOperand(0));
1756  if (!Priority) continue; // Malformed.
1757  Structors.push_back(Structor());
1758  Structor &S = Structors.back();
1759  S.Priority = Priority->getLimitedValue(65535);
1760  S.Func = CS->getOperand(1);
1761  if (ETy->getNumElements() == 3 && !CS->getOperand(2)->isNullValue())
1762  S.ComdatKey =
1763  dyn_cast<GlobalValue>(CS->getOperand(2)->stripPointerCasts());
1764  }
1765 
1766  // Emit the function pointers in the target-specific order
1767  unsigned Align = Log2_32(DL.getPointerPrefAlignment());
1768  std::stable_sort(Structors.begin(), Structors.end(),
1769  [](const Structor &L,
1770  const Structor &R) { return L.Priority < R.Priority; });
1771  for (Structor &S : Structors) {
1773  const MCSymbol *KeySym = nullptr;
1774  if (GlobalValue *GV = S.ComdatKey) {
1775  if (GV->isDeclarationForLinker())
1776  // If the associated variable is not defined in this module
1777  // (it might be available_externally, or have been an
1778  // available_externally definition that was dropped by the
1779  // EliminateAvailableExternally pass), some other TU
1780  // will provide its dynamic initializer.
1781  continue;
1782 
1783  KeySym = getSymbol(GV);
1784  }
1785  MCSection *OutputSection =
1786  (isCtor ? Obj.getStaticCtorSection(S.Priority, KeySym)
1787  : Obj.getStaticDtorSection(S.Priority, KeySym));
1788  OutStreamer->SwitchSection(OutputSection);
1789  if (OutStreamer->getCurrentSection() != OutStreamer->getPreviousSection())
1790  EmitAlignment(Align);
1791  EmitXXStructor(DL, S.Func);
1792  }
1793 }
1794 
1795 void AsmPrinter::EmitModuleIdents(Module &M) {
1796  if (!MAI->hasIdentDirective())
1797  return;
1798 
1799  if (const NamedMDNode *NMD = M.getNamedMetadata("llvm.ident")) {
1800  for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) {
1801  const MDNode *N = NMD->getOperand(i);
1802  assert(N->getNumOperands() == 1 &&
1803  "llvm.ident metadata entry can have only one operand");
1804  const MDString *S = cast<MDString>(N->getOperand(0));
1805  OutStreamer->EmitIdent(S->getString());
1806  }
1807  }
1808 }
1809 
1810 //===--------------------------------------------------------------------===//
1811 // Emission and print routines
1812 //
1813 
1814 /// EmitInt8 - Emit a byte directive and value.
1815 ///
1816 void AsmPrinter::EmitInt8(int Value) const {
1817  OutStreamer->EmitIntValue(Value, 1);
1818 }
1819 
1820 /// EmitInt16 - Emit a short directive and value.
1821 ///
1822 void AsmPrinter::EmitInt16(int Value) const {
1823  OutStreamer->EmitIntValue(Value, 2);
1824 }
1825 
1826 /// EmitInt32 - Emit a long directive and value.
1827 ///
1828 void AsmPrinter::EmitInt32(int Value) const {
1829  OutStreamer->EmitIntValue(Value, 4);
1830 }
1831 
1832 /// Emit something like ".long Hi-Lo" where the size in bytes of the directive
1833 /// is specified by Size and Hi/Lo specify the labels. This implicitly uses
1834 /// .set if it avoids relocations.
1836  unsigned Size) const {
1837  OutStreamer->emitAbsoluteSymbolDiff(Hi, Lo, Size);
1838 }
1839 
1840 /// EmitLabelPlusOffset - Emit something like ".long Label+Offset"
1841 /// where the size in bytes of the directive is specified by Size and Label
1842 /// specifies the label. This implicitly uses .set if it is available.
1844  unsigned Size,
1845  bool IsSectionRelative) const {
1846  if (MAI->needsDwarfSectionOffsetDirective() && IsSectionRelative) {
1847  OutStreamer->EmitCOFFSecRel32(Label, Offset);
1848  if (Size > 4)
1849  OutStreamer->EmitZeros(Size - 4);
1850  return;
1851  }
1852 
1853  // Emit Label+Offset (or just Label if Offset is zero)
1854  const MCExpr *Expr = MCSymbolRefExpr::create(Label, OutContext);
1855  if (Offset)
1856  Expr = MCBinaryExpr::createAdd(
1857  Expr, MCConstantExpr::create(Offset, OutContext), OutContext);
1858 
1859  OutStreamer->EmitValue(Expr, Size);
1860 }
1861 
1862 //===----------------------------------------------------------------------===//
1863 
1864 // EmitAlignment - Emit an alignment directive to the specified power of
1865 // two boundary. For example, if you pass in 3 here, you will get an 8
1866 // byte alignment. If a global value is specified, and if that global has
1867 // an explicit alignment requested, it will override the alignment request
1868 // if required for correctness.
1869 //
1870 void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalObject *GV) const {
1871  if (GV)
1872  NumBits = getGVAlignmentLog2(GV, GV->getParent()->getDataLayout(), NumBits);
1873 
1874  if (NumBits == 0) return; // 1-byte aligned: no need to emit alignment.
1875 
1876  assert(NumBits <
1877  static_cast<unsigned>(std::numeric_limits<unsigned>::digits) &&
1878  "undefined behavior");
1879  if (getCurrentSection()->getKind().isText())
1880  OutStreamer->EmitCodeAlignment(1u << NumBits);
1881  else
1882  OutStreamer->EmitValueToAlignment(1u << NumBits);
1883 }
1884 
1885 //===----------------------------------------------------------------------===//
1886 // Constant emission.
1887 //===----------------------------------------------------------------------===//
1888 
1890  MCContext &Ctx = OutContext;
1891 
1892  if (CV->isNullValue() || isa<UndefValue>(CV))
1893  return MCConstantExpr::create(0, Ctx);
1894 
1895  if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV))
1896  return MCConstantExpr::create(CI->getZExtValue(), Ctx);
1897 
1898  if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV))
1899  return MCSymbolRefExpr::create(getSymbol(GV), Ctx);
1900 
1901  if (const BlockAddress *BA = dyn_cast<BlockAddress>(CV))
1903 
1904  const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV);
1905  if (!CE) {
1906  llvm_unreachable("Unknown constant value to lower!");
1907  }
1908 
1909  switch (CE->getOpcode()) {
1910  default:
1911  // If the code isn't optimized, there may be outstanding folding
1912  // opportunities. Attempt to fold the expression using DataLayout as a
1913  // last resort before giving up.
1915  if (C != CE)
1916  return lowerConstant(C);
1917 
1918  // Otherwise report the problem to the user.
1919  {
1920  std::string S;
1921  raw_string_ostream OS(S);
1922  OS << "Unsupported expression in static initializer: ";
1923  CE->printAsOperand(OS, /*PrintType=*/false,
1924  !MF ? nullptr : MF->getFunction()->getParent());
1925  report_fatal_error(OS.str());
1926  }
1927  case Instruction::GetElementPtr: {
1928  // Generate a symbolic expression for the byte address
1929  APInt OffsetAI(getDataLayout().getPointerTypeSizeInBits(CE->getType()), 0);
1930  cast<GEPOperator>(CE)->accumulateConstantOffset(getDataLayout(), OffsetAI);
1931 
1932  const MCExpr *Base = lowerConstant(CE->getOperand(0));
1933  if (!OffsetAI)
1934  return Base;
1935 
1936  int64_t Offset = OffsetAI.getSExtValue();
1937  return MCBinaryExpr::createAdd(Base, MCConstantExpr::create(Offset, Ctx),
1938  Ctx);
1939  }
1940 
1941  case Instruction::Trunc:
1942  // We emit the value and depend on the assembler to truncate the generated
1943  // expression properly. This is important for differences between
1944  // blockaddress labels. Since the two labels are in the same function, it
1945  // is reasonable to treat their delta as a 32-bit value.
1947  case Instruction::BitCast:
1948  return lowerConstant(CE->getOperand(0));
1949 
1950  case Instruction::IntToPtr: {
1951  const DataLayout &DL = getDataLayout();
1952 
1953  // Handle casts to pointers by changing them into casts to the appropriate
1954  // integer type. This promotes constant folding and simplifies this code.
1955  Constant *Op = CE->getOperand(0);
1957  false/*ZExt*/);
1958  return lowerConstant(Op);
1959  }
1960 
1961  case Instruction::PtrToInt: {
1962  const DataLayout &DL = getDataLayout();
1963 
1964  // Support only foldable casts to/from pointers that can be eliminated by
1965  // changing the pointer to the appropriately sized integer type.
1966  Constant *Op = CE->getOperand(0);
1967  Type *Ty = CE->getType();
1968 
1969  const MCExpr *OpExpr = lowerConstant(Op);
1970 
1971  // We can emit the pointer value into this slot if the slot is an
1972  // integer slot equal to the size of the pointer.
1973  if (DL.getTypeAllocSize(Ty) == DL.getTypeAllocSize(Op->getType()))
1974  return OpExpr;
1975 
1976  // Otherwise the pointer is smaller than the resultant integer, mask off
1977  // the high bits so we are sure to get a proper truncation if the input is
1978  // a constant expr.
1979  unsigned InBits = DL.getTypeAllocSizeInBits(Op->getType());
1980  const MCExpr *MaskExpr = MCConstantExpr::create(~0ULL >> (64-InBits), Ctx);
1981  return MCBinaryExpr::createAnd(OpExpr, MaskExpr, Ctx);
1982  }
1983 
1984  case Instruction::Sub: {
1985  GlobalValue *LHSGV;
1986  APInt LHSOffset;
1987  if (IsConstantOffsetFromGlobal(CE->getOperand(0), LHSGV, LHSOffset,
1988  getDataLayout())) {
1989  GlobalValue *RHSGV;
1990  APInt RHSOffset;
1991  if (IsConstantOffsetFromGlobal(CE->getOperand(1), RHSGV, RHSOffset,
1992  getDataLayout())) {
1993  const MCExpr *RelocExpr =
1994  getObjFileLowering().lowerRelativeReference(LHSGV, RHSGV, TM);
1995  if (!RelocExpr)
1996  RelocExpr = MCBinaryExpr::createSub(
1997  MCSymbolRefExpr::create(getSymbol(LHSGV), Ctx),
1998  MCSymbolRefExpr::create(getSymbol(RHSGV), Ctx), Ctx);
1999  int64_t Addend = (LHSOffset - RHSOffset).getSExtValue();
2000  if (Addend != 0)
2001  RelocExpr = MCBinaryExpr::createAdd(
2002  RelocExpr, MCConstantExpr::create(Addend, Ctx), Ctx);
2003  return RelocExpr;
2004  }
2005  }
2006  }
2007  // else fallthrough
2008 
2009  // The MC library also has a right-shift operator, but it isn't consistently
2010  // signed or unsigned between different targets.
2011  case Instruction::Add:
2012  case Instruction::Mul:
2013  case Instruction::SDiv:
2014  case Instruction::SRem:
2015  case Instruction::Shl:
2016  case Instruction::And:
2017  case Instruction::Or:
2018  case Instruction::Xor: {
2019  const MCExpr *LHS = lowerConstant(CE->getOperand(0));
2020  const MCExpr *RHS = lowerConstant(CE->getOperand(1));
2021  switch (CE->getOpcode()) {
2022  default: llvm_unreachable("Unknown binary operator constant cast expr");
2023  case Instruction::Add: return MCBinaryExpr::createAdd(LHS, RHS, Ctx);
2024  case Instruction::Sub: return MCBinaryExpr::createSub(LHS, RHS, Ctx);
2025  case Instruction::Mul: return MCBinaryExpr::createMul(LHS, RHS, Ctx);
2026  case Instruction::SDiv: return MCBinaryExpr::createDiv(LHS, RHS, Ctx);
2027  case Instruction::SRem: return MCBinaryExpr::createMod(LHS, RHS, Ctx);
2028  case Instruction::Shl: return MCBinaryExpr::createShl(LHS, RHS, Ctx);
2029  case Instruction::And: return MCBinaryExpr::createAnd(LHS, RHS, Ctx);
2030  case Instruction::Or: return MCBinaryExpr::createOr (LHS, RHS, Ctx);
2031  case Instruction::Xor: return MCBinaryExpr::createXor(LHS, RHS, Ctx);
2032  }
2033  }
2034  }
2035 }
2036 
2037 static void emitGlobalConstantImpl(const DataLayout &DL, const Constant *C,
2038  AsmPrinter &AP,
2039  const Constant *BaseCV = nullptr,
2040  uint64_t Offset = 0);
2041 
2042 static void emitGlobalConstantFP(const ConstantFP *CFP, AsmPrinter &AP);
2043 
2044 /// isRepeatedByteSequence - Determine whether the given value is
2045 /// composed of a repeated sequence of identical bytes and return the
2046 /// byte value. If it is not a repeated sequence, return -1.
2049  assert(!Data.empty() && "Empty aggregates should be CAZ node");
2050  char C = Data[0];
2051  for (unsigned i = 1, e = Data.size(); i != e; ++i)
2052  if (Data[i] != C) return -1;
2053  return static_cast<uint8_t>(C); // Ensure 255 is not returned as -1.
2054 }
2055 
2056 /// isRepeatedByteSequence - Determine whether the given value is
2057 /// composed of a repeated sequence of identical bytes and return the
2058 /// byte value. If it is not a repeated sequence, return -1.
2059 static int isRepeatedByteSequence(const Value *V, const DataLayout &DL) {
2060  if (const ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
2061  uint64_t Size = DL.getTypeAllocSizeInBits(V->getType());
2062  assert(Size % 8 == 0);
2063 
2064  // Extend the element to take zero padding into account.
2065  APInt Value = CI->getValue().zextOrSelf(Size);
2066  if (!Value.isSplat(8))
2067  return -1;
2068 
2069  return Value.zextOrTrunc(8).getZExtValue();
2070  }
2071  if (const ConstantArray *CA = dyn_cast<ConstantArray>(V)) {
2072  // Make sure all array elements are sequences of the same repeated
2073  // byte.
2074  assert(CA->getNumOperands() != 0 && "Should be a CAZ");
2075  Constant *Op0 = CA->getOperand(0);
2076  int Byte = isRepeatedByteSequence(Op0, DL);
2077  if (Byte == -1)
2078  return -1;
2079 
2080  // All array elements must be equal.
2081  for (unsigned i = 1, e = CA->getNumOperands(); i != e; ++i)
2082  if (CA->getOperand(i) != Op0)
2083  return -1;
2084  return Byte;
2085  }
2086 
2087  if (const ConstantDataSequential *CDS = dyn_cast<ConstantDataSequential>(V))
2088  return isRepeatedByteSequence(CDS);
2089 
2090  return -1;
2091 }
2092 
2094  const ConstantDataSequential *CDS,
2095  AsmPrinter &AP) {
2096  // See if we can aggregate this into a .fill, if so, emit it as such.
2097  int Value = isRepeatedByteSequence(CDS, DL);
2098  if (Value != -1) {
2099  uint64_t Bytes = DL.getTypeAllocSize(CDS->getType());
2100  // Don't emit a 1-byte object as a .fill.
2101  if (Bytes > 1)
2102  return AP.OutStreamer->emitFill(Bytes, Value);
2103  }
2104 
2105  // If this can be emitted with .ascii/.asciz, emit it as such.
2106  if (CDS->isString())
2107  return AP.OutStreamer->EmitBytes(CDS->getAsString());
2108 
2109  // Otherwise, emit the values in successive locations.
2110  unsigned ElementByteSize = CDS->getElementByteSize();
2111  if (isa<IntegerType>(CDS->getElementType())) {
2112  for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) {
2113  if (AP.isVerbose())
2114  AP.OutStreamer->GetCommentOS() << format("0x%" PRIx64 "\n",
2115  CDS->getElementAsInteger(i));
2116  AP.OutStreamer->EmitIntValue(CDS->getElementAsInteger(i),
2117  ElementByteSize);
2118  }
2119  } else {
2120  for (unsigned I = 0, E = CDS->getNumElements(); I != E; ++I)
2121  emitGlobalConstantFP(cast<ConstantFP>(CDS->getElementAsConstant(I)), AP);
2122  }
2123 
2124  unsigned Size = DL.getTypeAllocSize(CDS->getType());
2125  unsigned EmittedSize = DL.getTypeAllocSize(CDS->getType()->getElementType()) *
2126  CDS->getNumElements();
2127  if (unsigned Padding = Size - EmittedSize)
2128  AP.OutStreamer->EmitZeros(Padding);
2129 }
2130 
2131 static void emitGlobalConstantArray(const DataLayout &DL,
2132  const ConstantArray *CA, AsmPrinter &AP,
2133  const Constant *BaseCV, uint64_t Offset) {
2134  // See if we can aggregate some values. Make sure it can be
2135  // represented as a series of bytes of the constant value.
2136  int Value = isRepeatedByteSequence(CA, DL);
2137 
2138  if (Value != -1) {
2139  uint64_t Bytes = DL.getTypeAllocSize(CA->getType());
2140  AP.OutStreamer->emitFill(Bytes, Value);
2141  }
2142  else {
2143  for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i) {
2144  emitGlobalConstantImpl(DL, CA->getOperand(i), AP, BaseCV, Offset);
2145  Offset += DL.getTypeAllocSize(CA->getOperand(i)->getType());
2146  }
2147  }
2148 }
2149 
2150 static void emitGlobalConstantVector(const DataLayout &DL,
2151  const ConstantVector *CV, AsmPrinter &AP) {
2152  for (unsigned i = 0, e = CV->getType()->getNumElements(); i != e; ++i)
2153  emitGlobalConstantImpl(DL, CV->getOperand(i), AP);
2154 
2155  unsigned Size = DL.getTypeAllocSize(CV->getType());
2156  unsigned EmittedSize = DL.getTypeAllocSize(CV->getType()->getElementType()) *
2157  CV->getType()->getNumElements();
2158  if (unsigned Padding = Size - EmittedSize)
2159  AP.OutStreamer->EmitZeros(Padding);
2160 }
2161 
2162 static void emitGlobalConstantStruct(const DataLayout &DL,
2163  const ConstantStruct *CS, AsmPrinter &AP,
2164  const Constant *BaseCV, uint64_t Offset) {
2165  // Print the fields in successive locations. Pad to align if needed!
2166  unsigned Size = DL.getTypeAllocSize(CS->getType());
2167  const StructLayout *Layout = DL.getStructLayout(CS->getType());
2168  uint64_t SizeSoFar = 0;
2169  for (unsigned i = 0, e = CS->getNumOperands(); i != e; ++i) {
2170  const Constant *Field = CS->getOperand(i);
2171 
2172  // Print the actual field value.
2173  emitGlobalConstantImpl(DL, Field, AP, BaseCV, Offset + SizeSoFar);
2174 
2175  // Check if padding is needed and insert one or more 0s.
2176  uint64_t FieldSize = DL.getTypeAllocSize(Field->getType());
2177  uint64_t PadSize = ((i == e-1 ? Size : Layout->getElementOffset(i+1))
2178  - Layout->getElementOffset(i)) - FieldSize;
2179  SizeSoFar += FieldSize + PadSize;
2180 
2181  // Insert padding - this may include padding to increase the size of the
2182  // current field up to the ABI size (if the struct is not packed) as well
2183  // as padding to ensure that the next field starts at the right offset.
2184  AP.OutStreamer->EmitZeros(PadSize);
2185  }
2186  assert(SizeSoFar == Layout->getSizeInBytes() &&
2187  "Layout of constant struct may be incorrect!");
2188 }
2189 
2190 static void emitGlobalConstantFP(const ConstantFP *CFP, AsmPrinter &AP) {
2191  APInt API = CFP->getValueAPF().bitcastToAPInt();
2192 
2193  // First print a comment with what we think the original floating-point value
2194  // should have been.
2195  if (AP.isVerbose()) {
2197  CFP->getValueAPF().toString(StrVal);
2198 
2199  if (CFP->getType())
2200  CFP->getType()->print(AP.OutStreamer->GetCommentOS());
2201  else
2202  AP.OutStreamer->GetCommentOS() << "Printing <null> Type";
2203  AP.OutStreamer->GetCommentOS() << ' ' << StrVal << '\n';
2204  }
2205 
2206  // Now iterate through the APInt chunks, emitting them in endian-correct
2207  // order, possibly with a smaller chunk at beginning/end (e.g. for x87 80-bit
2208  // floats).
2209  unsigned NumBytes = API.getBitWidth() / 8;
2210  unsigned TrailingBytes = NumBytes % sizeof(uint64_t);
2211  const uint64_t *p = API.getRawData();
2212 
2213  // PPC's long double has odd notions of endianness compared to how LLVM
2214  // handles it: p[0] goes first for *big* endian on PPC.
2215  if (AP.getDataLayout().isBigEndian() && !CFP->getType()->isPPC_FP128Ty()) {
2216  int Chunk = API.getNumWords() - 1;
2217 
2218  if (TrailingBytes)
2219  AP.OutStreamer->EmitIntValue(p[Chunk--], TrailingBytes);
2220 
2221  for (; Chunk >= 0; --Chunk)
2222  AP.OutStreamer->EmitIntValue(p[Chunk], sizeof(uint64_t));
2223  } else {
2224  unsigned Chunk;
2225  for (Chunk = 0; Chunk < NumBytes / sizeof(uint64_t); ++Chunk)
2226  AP.OutStreamer->EmitIntValue(p[Chunk], sizeof(uint64_t));
2227 
2228  if (TrailingBytes)
2229  AP.OutStreamer->EmitIntValue(p[Chunk], TrailingBytes);
2230  }
2231 
2232  // Emit the tail padding for the long double.
2233  const DataLayout &DL = AP.getDataLayout();
2234  AP.OutStreamer->EmitZeros(DL.getTypeAllocSize(CFP->getType()) -
2235  DL.getTypeStoreSize(CFP->getType()));
2236 }
2237 
2239  const DataLayout &DL = AP.getDataLayout();
2240  unsigned BitWidth = CI->getBitWidth();
2241 
2242  // Copy the value as we may massage the layout for constants whose bit width
2243  // is not a multiple of 64-bits.
2244  APInt Realigned(CI->getValue());
2245  uint64_t ExtraBits = 0;
2246  unsigned ExtraBitsSize = BitWidth & 63;
2247 
2248  if (ExtraBitsSize) {
2249  // The bit width of the data is not a multiple of 64-bits.
2250  // The extra bits are expected to be at the end of the chunk of the memory.
2251  // Little endian:
2252  // * Nothing to be done, just record the extra bits to emit.
2253  // Big endian:
2254  // * Record the extra bits to emit.
2255  // * Realign the raw data to emit the chunks of 64-bits.
2256  if (DL.isBigEndian()) {
2257  // Basically the structure of the raw data is a chunk of 64-bits cells:
2258  // 0 1 BitWidth / 64
2259  // [chunk1][chunk2] ... [chunkN].
2260  // The most significant chunk is chunkN and it should be emitted first.
2261  // However, due to the alignment issue chunkN contains useless bits.
2262  // Realign the chunks so that they contain only useless information:
2263  // ExtraBits 0 1 (BitWidth / 64) - 1
2264  // chu[nk1 chu][nk2 chu] ... [nkN-1 chunkN]
2265  ExtraBits = Realigned.getRawData()[0] &
2266  (((uint64_t)-1) >> (64 - ExtraBitsSize));
2267  Realigned.lshrInPlace(ExtraBitsSize);
2268  } else
2269  ExtraBits = Realigned.getRawData()[BitWidth / 64];
2270  }
2271 
2272  // We don't expect assemblers to support integer data directives
2273  // for more than 64 bits, so we emit the data in at most 64-bit
2274  // quantities at a time.
2275  const uint64_t *RawData = Realigned.getRawData();
2276  for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) {
2277  uint64_t Val = DL.isBigEndian() ? RawData[e - i - 1] : RawData[i];
2278  AP.OutStreamer->EmitIntValue(Val, 8);
2279  }
2280 
2281  if (ExtraBitsSize) {
2282  // Emit the extra bits after the 64-bits chunks.
2283 
2284  // Emit a directive that fills the expected size.
2285  uint64_t Size = AP.getDataLayout().getTypeAllocSize(CI->getType());
2286  Size -= (BitWidth / 64) * 8;
2287  assert(Size && Size * 8 >= ExtraBitsSize &&
2288  (ExtraBits & (((uint64_t)-1) >> (64 - ExtraBitsSize)))
2289  == ExtraBits && "Directive too small for extra bits.");
2290  AP.OutStreamer->EmitIntValue(ExtraBits, Size);
2291  }
2292 }
2293 
2294 /// \brief Transform a not absolute MCExpr containing a reference to a GOT
2295 /// equivalent global, by a target specific GOT pc relative access to the
2296 /// final symbol.
2297 static void handleIndirectSymViaGOTPCRel(AsmPrinter &AP, const MCExpr **ME,
2298  const Constant *BaseCst,
2299  uint64_t Offset) {
2300  // The global @foo below illustrates a global that uses a got equivalent.
2301  //
2302  // @bar = global i32 42
2303  // @gotequiv = private unnamed_addr constant i32* @bar
2304  // @foo = i32 trunc (i64 sub (i64 ptrtoint (i32** @gotequiv to i64),
2305  // i64 ptrtoint (i32* @foo to i64))
2306  // to i32)
2307  //
2308  // The cstexpr in @foo is converted into the MCExpr `ME`, where we actually
2309  // check whether @foo is suitable to use a GOTPCREL. `ME` is usually in the
2310  // form:
2311  //
2312  // foo = cstexpr, where
2313  // cstexpr := <gotequiv> - "." + <cst>
2314  // cstexpr := <gotequiv> - (<foo> - <offset from @foo base>) + <cst>
2315  //
2316  // After canonicalization by evaluateAsRelocatable `ME` turns into:
2317  //
2318  // cstexpr := <gotequiv> - <foo> + gotpcrelcst, where
2319  // gotpcrelcst := <offset from @foo base> + <cst>
2320  //
2321  MCValue MV;
2322  if (!(*ME)->evaluateAsRelocatable(MV, nullptr, nullptr) || MV.isAbsolute())
2323  return;
2324  const MCSymbolRefExpr *SymA = MV.getSymA();
2325  if (!SymA)
2326  return;
2327 
2328  // Check that GOT equivalent symbol is cached.
2329  const MCSymbol *GOTEquivSym = &SymA->getSymbol();
2330  if (!AP.GlobalGOTEquivs.count(GOTEquivSym))
2331  return;
2332 
2333  const GlobalValue *BaseGV = dyn_cast_or_null<GlobalValue>(BaseCst);
2334  if (!BaseGV)
2335  return;
2336 
2337  // Check for a valid base symbol
2338  const MCSymbol *BaseSym = AP.getSymbol(BaseGV);
2339  const MCSymbolRefExpr *SymB = MV.getSymB();
2340 
2341  if (!SymB || BaseSym != &SymB->getSymbol())
2342  return;
2343 
2344  // Make sure to match:
2345  //
2346  // gotpcrelcst := <offset from @foo base> + <cst>
2347  //
2348  // If gotpcrelcst is positive it means that we can safely fold the pc rel
2349  // displacement into the GOTPCREL. We can also can have an extra offset <cst>
2350  // if the target knows how to encode it.
2351  //
2352  int64_t GOTPCRelCst = Offset + MV.getConstant();
2353  if (GOTPCRelCst < 0)
2354  return;
2355  if (!AP.getObjFileLowering().supportGOTPCRelWithOffset() && GOTPCRelCst != 0)
2356  return;
2357 
2358  // Emit the GOT PC relative to replace the got equivalent global, i.e.:
2359  //
2360  // bar:
2361  // .long 42
2362  // gotequiv:
2363  // .quad bar
2364  // foo:
2365  // .long gotequiv - "." + <cst>
2366  //
2367  // is replaced by the target specific equivalent to:
2368  //
2369  // bar:
2370  // .long 42
2371  // foo:
2372  // .long bar@GOTPCREL+<gotpcrelcst>
2373  //
2374  AsmPrinter::GOTEquivUsePair Result = AP.GlobalGOTEquivs[GOTEquivSym];
2375  const GlobalVariable *GV = Result.first;
2376  int NumUses = (int)Result.second;
2377  const GlobalValue *FinalGV = dyn_cast<GlobalValue>(GV->getOperand(0));
2378  const MCSymbol *FinalSym = AP.getSymbol(FinalGV);
2380  FinalSym, MV, Offset, AP.MMI, *AP.OutStreamer);
2381 
2382  // Update GOT equivalent usage information
2383  --NumUses;
2384  if (NumUses >= 0)
2385  AP.GlobalGOTEquivs[GOTEquivSym] = std::make_pair(GV, NumUses);
2386 }
2387 
2388 static void emitGlobalConstantImpl(const DataLayout &DL, const Constant *CV,
2389  AsmPrinter &AP, const Constant *BaseCV,
2390  uint64_t Offset) {
2391  uint64_t Size = DL.getTypeAllocSize(CV->getType());
2392 
2393  // Globals with sub-elements such as combinations of arrays and structs
2394  // are handled recursively by emitGlobalConstantImpl. Keep track of the
2395  // constant symbol base and the current position with BaseCV and Offset.
2396  if (!BaseCV && CV->hasOneUse())
2397  BaseCV = dyn_cast<Constant>(CV->user_back());
2398 
2399  if (isa<ConstantAggregateZero>(CV) || isa<UndefValue>(CV))
2400  return AP.OutStreamer->EmitZeros(Size);
2401 
2402  if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
2403  switch (Size) {
2404  case 1:
2405  case 2:
2406  case 4:
2407  case 8:
2408  if (AP.isVerbose())
2409  AP.OutStreamer->GetCommentOS() << format("0x%" PRIx64 "\n",
2410  CI->getZExtValue());
2411  AP.OutStreamer->EmitIntValue(CI->getZExtValue(), Size);
2412  return;
2413  default:
2415  return;
2416  }
2417  }
2418 
2419  if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV))
2420  return emitGlobalConstantFP(CFP, AP);
2421 
2422  if (isa<ConstantPointerNull>(CV)) {
2423  AP.OutStreamer->EmitIntValue(0, Size);
2424  return;
2425  }
2426 
2427  if (const ConstantDataSequential *CDS = dyn_cast<ConstantDataSequential>(CV))
2428  return emitGlobalConstantDataSequential(DL, CDS, AP);
2429 
2430  if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV))
2431  return emitGlobalConstantArray(DL, CVA, AP, BaseCV, Offset);
2432 
2433  if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV))
2434  return emitGlobalConstantStruct(DL, CVS, AP, BaseCV, Offset);
2435 
2436  if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) {
2437  // Look through bitcasts, which might not be able to be MCExpr'ized (e.g. of
2438  // vectors).
2439  if (CE->getOpcode() == Instruction::BitCast)
2440  return emitGlobalConstantImpl(DL, CE->getOperand(0), AP);
2441 
2442  if (Size > 8) {
2443  // If the constant expression's size is greater than 64-bits, then we have
2444  // to emit the value in chunks. Try to constant fold the value and emit it
2445  // that way.
2446  Constant *New = ConstantFoldConstant(CE, DL);
2447  if (New && New != CE)
2448  return emitGlobalConstantImpl(DL, New, AP);
2449  }
2450  }
2451 
2452  if (const ConstantVector *V = dyn_cast<ConstantVector>(CV))
2453  return emitGlobalConstantVector(DL, V, AP);
2454 
2455  // Otherwise, it must be a ConstantExpr. Lower it to an MCExpr, then emit it
2456  // thread the streamer with EmitValue.
2457  const MCExpr *ME = AP.lowerConstant(CV);
2458 
2459  // Since lowerConstant already folded and got rid of all IR pointer and
2460  // integer casts, detect GOT equivalent accesses by looking into the MCExpr
2461  // directly.
2463  handleIndirectSymViaGOTPCRel(AP, &ME, BaseCV, Offset);
2464 
2465  AP.OutStreamer->EmitValue(ME, Size);
2466 }
2467 
2468 /// EmitGlobalConstant - Print a general LLVM constant to the .s file.
2470  uint64_t Size = DL.getTypeAllocSize(CV->getType());
2471  if (Size)
2472  emitGlobalConstantImpl(DL, CV, *this);
2473  else if (MAI->hasSubsectionsViaSymbols()) {
2474  // If the global has zero size, emit a single byte so that two labels don't
2475  // look like they are at the same location.
2476  OutStreamer->EmitIntValue(0, 1);
2477  }
2478 }
2479 
2481  // Target doesn't support this yet!
2482  llvm_unreachable("Target does not support EmitMachineConstantPoolValue");
2483 }
2484 
2485 void AsmPrinter::printOffset(int64_t Offset, raw_ostream &OS) const {
2486  if (Offset > 0)
2487  OS << '+' << Offset;
2488  else if (Offset < 0)
2489  OS << Offset;
2490 }
2491 
2492 //===----------------------------------------------------------------------===//
2493 // Symbol Lowering Routines.
2494 //===----------------------------------------------------------------------===//
2495 
2497  return OutContext.createTempSymbol(Name, true);
2498 }
2499 
2501  return MMI->getAddrLabelSymbol(BA->getBasicBlock());
2502 }
2503 
2505  return MMI->getAddrLabelSymbol(BB);
2506 }
2507 
2508 /// GetCPISymbol - Return the symbol for the specified constant pool entry.
2509 MCSymbol *AsmPrinter::GetCPISymbol(unsigned CPID) const {
2510  const DataLayout &DL = getDataLayout();
2512  "CPI" + Twine(getFunctionNumber()) + "_" +
2513  Twine(CPID));
2514 }
2515 
2516 /// GetJTISymbol - Return the symbol for the specified jump table entry.
2517 MCSymbol *AsmPrinter::GetJTISymbol(unsigned JTID, bool isLinkerPrivate) const {
2518  return MF->getJTISymbol(JTID, OutContext, isLinkerPrivate);
2519 }
2520 
2521 /// GetJTSetSymbol - Return the symbol for the specified jump table .set
2522 /// FIXME: privatize to AsmPrinter.
2523 MCSymbol *AsmPrinter::GetJTSetSymbol(unsigned UID, unsigned MBBID) const {
2524  const DataLayout &DL = getDataLayout();
2526  Twine(getFunctionNumber()) + "_" +
2527  Twine(UID) + "_set_" + Twine(MBBID));
2528 }
2529 
2531  StringRef Suffix) const {
2532  return getObjFileLowering().getSymbolWithGlobalValueBase(GV, Suffix, TM);
2533 }
2534 
2535 /// Return the MCSymbol for the specified ExternalSymbol.
2537  SmallString<60> NameStr;
2538  Mangler::getNameWithPrefix(NameStr, Sym, getDataLayout());
2539  return OutContext.getOrCreateSymbol(NameStr);
2540 }
2541 
2542 /// PrintParentLoopComment - Print comments about parent loops of this one.
2544  unsigned FunctionNumber) {
2545  if (!Loop) return;
2547  OS.indent(Loop->getLoopDepth()*2)
2548  << "Parent Loop BB" << FunctionNumber << "_"
2549  << Loop->getHeader()->getNumber()
2550  << " Depth=" << Loop->getLoopDepth() << '\n';
2551 }
2552 
2553 
2554 /// PrintChildLoopComment - Print comments about child loops within
2555 /// the loop for this basic block, with nesting.
2557  unsigned FunctionNumber) {
2558  // Add child loop information
2559  for (const MachineLoop *CL : *Loop) {
2560  OS.indent(CL->getLoopDepth()*2)
2561  << "Child Loop BB" << FunctionNumber << "_"
2562  << CL->getHeader()->getNumber() << " Depth " << CL->getLoopDepth()
2563  << '\n';
2564  PrintChildLoopComment(OS, CL, FunctionNumber);
2565  }
2566 }
2567 
2568 /// emitBasicBlockLoopComments - Pretty-print comments for basic blocks.
2570  const MachineLoopInfo *LI,
2571  const AsmPrinter &AP) {
2572  // Add loop depth information
2573  const MachineLoop *Loop = LI->getLoopFor(&MBB);
2574  if (!Loop) return;
2575 
2576  MachineBasicBlock *Header = Loop->getHeader();
2577  assert(Header && "No header for loop");
2578 
2579  // If this block is not a loop header, just print out what is the loop header
2580  // and return.
2581  if (Header != &MBB) {
2582  AP.OutStreamer->AddComment(" in Loop: Header=BB" +
2583  Twine(AP.getFunctionNumber())+"_" +
2584  Twine(Loop->getHeader()->getNumber())+
2585  " Depth="+Twine(Loop->getLoopDepth()));
2586  return;
2587  }
2588 
2589  // Otherwise, it is a loop header. Print out information about child and
2590  // parent loops.
2591  raw_ostream &OS = AP.OutStreamer->GetCommentOS();
2592 
2594 
2595  OS << "=>";
2596  OS.indent(Loop->getLoopDepth()*2-2);
2597 
2598  OS << "This ";
2599  if (Loop->empty())
2600  OS << "Inner ";
2601  OS << "Loop Header: Depth=" + Twine(Loop->getLoopDepth()) << '\n';
2602 
2603  PrintChildLoopComment(OS, Loop, AP.getFunctionNumber());
2604 }
2605 
2606 /// EmitBasicBlockStart - This method prints the label for the specified
2607 /// MachineBasicBlock, an alignment (if present) and a comment describing
2608 /// it if appropriate.
2610  // End the previous funclet and start a new one.
2611  if (MBB.isEHFuncletEntry()) {
2612  for (const HandlerInfo &HI : Handlers) {
2613  HI.Handler->endFunclet();
2614  HI.Handler->beginFunclet(MBB);
2615  }
2616  }
2617 
2618  // Emit an alignment directive for this block, if needed.
2619  if (unsigned Align = MBB.getAlignment())
2621 
2622  // If the block has its address taken, emit any labels that were used to
2623  // reference the block. It is possible that there is more than one label
2624  // here, because multiple LLVM BB's may have been RAUW'd to this block after
2625  // the references were generated.
2626  if (MBB.hasAddressTaken()) {
2627  const BasicBlock *BB = MBB.getBasicBlock();
2628  if (isVerbose())
2629  OutStreamer->AddComment("Block address taken");
2630 
2631  // MBBs can have their address taken as part of CodeGen without having
2632  // their corresponding BB's address taken in IR
2633  if (BB->hasAddressTaken())
2634  for (MCSymbol *Sym : MMI->getAddrLabelSymbolToEmit(BB))
2635  OutStreamer->EmitLabel(Sym);
2636  }
2637 
2638  // Print some verbose block comments.
2639  if (isVerbose()) {
2640  if (const BasicBlock *BB = MBB.getBasicBlock()) {
2641  if (BB->hasName()) {
2642  BB->printAsOperand(OutStreamer->GetCommentOS(),
2643  /*PrintType=*/false, BB->getModule());
2644  OutStreamer->GetCommentOS() << '\n';
2645  }
2646  }
2647  emitBasicBlockLoopComments(MBB, LI, *this);
2648  }
2649 
2650  // Print the main label for the block.
2651  if (MBB.pred_empty() ||
2653  if (isVerbose()) {
2654  // NOTE: Want this comment at start of line, don't emit with AddComment.
2655  OutStreamer->emitRawComment(" BB#" + Twine(MBB.getNumber()) + ":", false);
2656  }
2657  } else {
2658  OutStreamer->EmitLabel(MBB.getSymbol());
2659  }
2660 }
2661 
2662 void AsmPrinter::EmitVisibility(MCSymbol *Sym, unsigned Visibility,
2663  bool IsDefinition) const {
2664  MCSymbolAttr Attr = MCSA_Invalid;
2665 
2666  switch (Visibility) {
2667  default: break;
2669  if (IsDefinition)
2670  Attr = MAI->getHiddenVisibilityAttr();
2671  else
2673  break;
2675  Attr = MAI->getProtectedVisibilityAttr();
2676  break;
2677  }
2678 
2679  if (Attr != MCSA_Invalid)
2680  OutStreamer->EmitSymbolAttribute(Sym, Attr);
2681 }
2682 
2683 /// isBlockOnlyReachableByFallthough - Return true if the basic block has
2684 /// exactly one predecessor and the control transfer mechanism between
2685 /// the predecessor and this block is a fall-through.
2686 bool AsmPrinter::
2688  // If this is a landing pad, it isn't a fall through. If it has no preds,
2689  // then nothing falls through to it.
2690  if (MBB->isEHPad() || MBB->pred_empty())
2691  return false;
2692 
2693  // If there isn't exactly one predecessor, it can't be a fall through.
2694  if (MBB->pred_size() > 1)
2695  return false;
2696 
2697  // The predecessor has to be immediately before this block.
2698  MachineBasicBlock *Pred = *MBB->pred_begin();
2699  if (!Pred->isLayoutSuccessor(MBB))
2700  return false;
2701 
2702  // If the block is completely empty, then it definitely does fall through.
2703  if (Pred->empty())
2704  return true;
2705 
2706  // Check the terminators in the previous blocks
2707  for (const auto &MI : Pred->terminators()) {
2708  // If it is not a simple branch, we are in a table somewhere.
2709  if (!MI.isBranch() || MI.isIndirectBranch())
2710  return false;
2711 
2712  // If we are the operands of one of the branches, this is not a fall
2713  // through. Note that targets with delay slots will usually bundle
2714  // terminators with the delay slot instruction.
2715  for (ConstMIBundleOperands OP(MI); OP.isValid(); ++OP) {
2716  if (OP->isJTI())
2717  return false;
2718  if (OP->isMBB() && OP->getMBB() == MBB)
2719  return false;
2720  }
2721  }
2722 
2723  return true;
2724 }
2725 
2726 GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy &S) {
2727  if (!S.usesMetadata())
2728  return nullptr;
2729 
2730  assert(!S.useStatepoints() && "statepoints do not currently support custom"
2731  " stackmap formats, please see the documentation for a description of"
2732  " the default format. If you really need a custom serialized format,"
2733  " please file a bug");
2734 
2735  gcp_map_type &GCMap = getGCMap(GCMetadataPrinters);
2736  gcp_map_type::iterator GCPI = GCMap.find(&S);
2737  if (GCPI != GCMap.end())
2738  return GCPI->second.get();
2739 
2740  auto Name = S.getName();
2741 
2744  E = GCMetadataPrinterRegistry::end(); I != E; ++I)
2745  if (Name == I->getName()) {
2746  std::unique_ptr<GCMetadataPrinter> GMP = I->instantiate();
2747  GMP->S = &S;
2748  auto IterBool = GCMap.insert(std::make_pair(&S, std::move(GMP)));
2749  return IterBool.first->second.get();
2750  }
2751 
2752  report_fatal_error("no GCMetadataPrinter registered for GC: " + Twine(Name));
2753 }
2754 
2755 /// Pin vtable to this file.
2757 
2759 
2760 // In the binary's "xray_instr_map" section, an array of these function entries
2761 // describes each instrumentation point. When XRay patches your code, the index
2762 // into this table will be given to your handler as a patch point identifier.
2764  const MCSymbol *CurrentFnSym) const {
2765  Out->EmitSymbolValue(Sled, Bytes);
2766  Out->EmitSymbolValue(CurrentFnSym, Bytes);
2767  auto Kind8 = static_cast<uint8_t>(Kind);
2768  Out->EmitBytes(StringRef(reinterpret_cast<const char *>(&Kind8), 1));
2769  Out->EmitBytes(
2770  StringRef(reinterpret_cast<const char *>(&AlwaysInstrument), 1));
2771  Out->EmitZeros(2 * Bytes - 2); // Pad the previous two entries
2772 }
2773 
2775  if (Sleds.empty())
2776  return;
2777 
2778  auto PrevSection = OutStreamer->getCurrentSectionOnly();
2779  auto Fn = MF->getFunction();
2780  MCSection *InstMap = nullptr;
2781  MCSection *FnSledIndex = nullptr;
2783  if (Fn->hasComdat()) {
2784  InstMap = OutContext.getELFSection("xray_instr_map", ELF::SHT_PROGBITS,
2786  Fn->getComdat()->getName());
2787  FnSledIndex = OutContext.getELFSection("xray_fn_idx", ELF::SHT_PROGBITS,
2789  Fn->getComdat()->getName());
2790  } else {
2791  InstMap = OutContext.getELFSection("xray_instr_map", ELF::SHT_PROGBITS,
2792  ELF::SHF_ALLOC);
2793  FnSledIndex = OutContext.getELFSection("xray_fn_idx", ELF::SHT_PROGBITS,
2794  ELF::SHF_ALLOC);
2795  }
2796  } else if (MF->getSubtarget().getTargetTriple().isOSBinFormatMachO()) {
2797  InstMap = OutContext.getMachOSection("__DATA", "xray_instr_map", 0,
2799  FnSledIndex = OutContext.getMachOSection("__DATA", "xray_fn_idx", 0,
2801  } else {
2802  llvm_unreachable("Unsupported target");
2803  }
2804 
2805  // Before we switch over, we force a reference to a label inside the
2806  // xray_fn_idx sections. This makes sure that the xray_fn_idx section is kept
2807  // live by the linker if the function is not garbage-collected. Since this
2808  // function is always called just before the function's end, we assume that
2809  // this is happening after the last return instruction.
2810  auto WordSizeBytes = MAI->getCodePointerSize();
2811  MCSymbol *IdxRef = OutContext.createTempSymbol("xray_fn_idx_synth_", true);
2812  OutStreamer->EmitCodeAlignment(16);
2813  OutStreamer->EmitSymbolValue(IdxRef, WordSizeBytes, false);
2814 
2815  // Now we switch to the instrumentation map section. Because this is done
2816  // per-function, we are able to create an index entry that will represent the
2817  // range of sleds associated with a function.
2818  MCSymbol *SledsStart = OutContext.createTempSymbol("xray_sleds_start", true);
2819  OutStreamer->SwitchSection(InstMap);
2820  OutStreamer->EmitLabel(SledsStart);
2821  for (const auto &Sled : Sleds)
2822  Sled.emit(WordSizeBytes, OutStreamer.get(), CurrentFnSym);
2823  MCSymbol *SledsEnd = OutContext.createTempSymbol("xray_sleds_end", true);
2824  OutStreamer->EmitLabel(SledsEnd);
2825 
2826  // We then emit a single entry in the index per function. We use the symbols
2827  // that bound the instrumentation map as the range for a specific function.
2828  // Each entry here will be 2 * word size aligned, as we're writing down two
2829  // pointers. This should work for both 32-bit and 64-bit platforms.
2830  OutStreamer->SwitchSection(FnSledIndex);
2831  OutStreamer->EmitCodeAlignment(2 * WordSizeBytes);
2832  OutStreamer->EmitLabel(IdxRef);
2833  OutStreamer->EmitSymbolValue(SledsStart, WordSizeBytes);
2834  OutStreamer->EmitSymbolValue(SledsEnd, WordSizeBytes);
2835  OutStreamer->SwitchSection(PrevSection);
2836  Sleds.clear();
2837 }
2838 
2840  SledKind Kind) {
2841  auto Fn = MI.getParent()->getParent()->getFunction();
2842  auto Attr = Fn->getFnAttribute("function-instrument");
2843  bool LogArgs = Fn->hasFnAttribute("xray-log-args");
2844  bool AlwaysInstrument =
2845  Attr.isStringAttribute() && Attr.getValueAsString() == "xray-always";
2846  if (Kind == SledKind::FUNCTION_ENTER && LogArgs)
2847  Kind = SledKind::LOG_ARGS_ENTER;
2848  Sleds.emplace_back(
2849  XRayFunctionEntry{ Sled, CurrentFnSym, Kind, AlwaysInstrument, Fn });
2850 }
2851 
2853  return OutStreamer->getContext().getDwarfVersion();
2854 }
2855 
2857  OutStreamer->getContext().setDwarfVersion(Version);
2858 }
virtual void EmitGlobalVariable(const GlobalVariable *GV)
Emit the specified global variable to the .s file.
Definition: AsmPrinter.cpp:425
void setDwarfVersion(uint16_t Version)
bool isDeclarationForLinker() const
Definition: GlobalValue.h:503
MachineConstantPoolValue * MachineCPVal
uint64_t CallInst * C
bool isOSDarwin() const
isOSDarwin - Is this a "Darwin" OS (OS X, iOS, or watchOS).
Definition: Triple.h:465
StringRef getSection() const
Get the custom section of this global if it has one.
Definition: GlobalObject.h:90
const TargetLoweringObjectFile & getObjFileLowering() const
Return information about object file lowering.
Definition: AsmPrinter.cpp:192
Instances of this class represent a uniqued identifier for a section in the current translation unit...
Definition: MCSection.h:39
IntegerType * getType() const
getType - Specialize the getType() method to always return an IntegerType, which reduces the amount o...
Definition: Constants.h:172
void push_back(const T &Elt)
Definition: SmallVector.h:212
bool doesSetDirectiveSuppressReloc() const
Definition: MCAsmInfo.h:508
virtual void EmitStartOfAsmFile(Module &)
This virtual method can be overridden by targets that want to emit something at the start of their fi...
Definition: AsmPrinter.h:361
void getiOSVersion(unsigned &Major, unsigned &Minor, unsigned &Micro) const
getiOSVersion - Parse the version number as with getOSVersion.
Definition: Triple.cpp:1044
A parsed version of the target data layout string in and methods for querying it. ...
Definition: DataLayout.h:109
static void emitGlobalConstantLargeInt(const ConstantInt *CI, AsmPrinter &AP)
StringRef getTargetFeatureString() const
bool usesWindowsCFI() const
Definition: MCAsmInfo.h:568
MCSymbolAttr getHiddenVisibilityAttr() const
Definition: MCAsmInfo.h:538
The MachineConstantPool class keeps track of constants referenced by a function which must be spilled...
union llvm::MachineConstantPoolEntry::@132 Val
The constant itself.
const std::vector< MachineJumpTableEntry > & getJumpTables() const
bool isThreadData() const
Definition: SectionKind.h:154
bool hasLocalLinkage() const
Definition: GlobalValue.h:416
unsigned getOpcode() const
Return the opcode at the root of this constant expression.
Definition: Constants.h:1171
Special purpose, only applies to global arrays.
Definition: GlobalValue.h:55
uint64_t getZExtValue() const
Get zero extended value.
Definition: APInt.h:1542
static void emitBasicBlockLoopComments(const MachineBasicBlock &MBB, const MachineLoopInfo *LI, const AsmPrinter &AP)
emitBasicBlockLoopComments - Pretty-print comments for basic blocks.
DiagnosticInfoOptimizationBase::Argument NV
std::unique_ptr< MCStreamer > OutStreamer
This is the MCStreamer object for the file we are generating.
Definition: AsmPrinter.h:93
bool hasDebugInfo() const
Returns true if valid debug info is present.
unsigned getFunctionNumber() const
getFunctionNumber - Return a unique ID for the current function.
MCSymbol * GetExternalSymbolSymbol(StringRef Sym) const
Return the MCSymbol for the specified ExternalSymbol.
static const MCSymbolRefExpr * create(const MCSymbol *Symbol, MCContext &Ctx)
Definition: MCExpr.h:305
static const char *const DbgTimerDescription
Definition: AsmPrinter.cpp:117
MCTargetOptions MCOptions
Machine level options.
virtual MCSection * getStaticCtorSection(unsigned Priority, const MCSymbol *KeySym) const
bool hasPrivateLinkage() const
Definition: GlobalValue.h:415
const Constant * getInitializer() const
getInitializer - Return the initializer for this global variable.
const std::vector< MCCFIInstruction > & getFrameInstructions() const
Returns a reference to a list of cfi instructions in the function&#39;s prologue.
LLVM_ATTRIBUTE_NORETURN void report_fatal_error(Error Err, bool gen_crash_diag=true)
Report a serious error, calling any installed error handler.
Definition: Error.cpp:103
Compute iterated dominance frontiers using a linear time algorithm.
Definition: AllocatorList.h:24
void EmitSymbolValue(const MCSymbol *Sym, unsigned Size, bool IsSectionRelative=false)
Special case of EmitValue that avoids the client having to pass in a MCExpr for MCSymbols.
Definition: MCStreamer.cpp:128
bool isVariable() const
isVariable - Check if this is a variable symbol.
Definition: MCSymbol.h:295
bool isMacOSX() const
isMacOSX - Is this a Mac OS X triple.
Definition: Triple.h:437
MCSection * SectionForGlobal(const GlobalObject *GO, SectionKind Kind, const TargetMachine &TM) const
This method computes the appropriate section to emit the specified global variable or function defini...
.type _foo, STT_OBJECT # aka
Definition: MCDirectives.h:25
This represents an "assembler immediate".
Definition: MCValue.h:40
static bool isGOTEquivalentCandidate(const GlobalVariable *GV, unsigned &NumGOTEquivUsers)
Only consider global GOT equivalents if at least one user is a cstexpr inside an initializer of anoth...
Constant * getElementAsConstant(unsigned i) const
Return a Constant for a specified index&#39;s element.
Definition: Constants.cpp:2645
bool hasMachoTBSSDirective() const
Definition: MCAsmInfo.h:460
StringRef getPrivateGlobalPrefix() const
Definition: DataLayout.h:281
void EmitInt8(int Value) const
Emit a byte directive and value.
MCSymbol - Instances of this class represent a symbol name in the MC file, and MCSymbols are created ...
Definition: MCSymbol.h:42
Not a valid directive.
Definition: MCDirectives.h:20
A Module instance is used to store all the information related to an LLVM module. ...
Definition: Module.h:63
void redefineIfPossible()
Prepare this symbol to be redefined.
Definition: MCSymbol.h:231
unsigned getPointerSize() const
Get the pointer size for this target.
MCSection * getTLSBSSSection() const
unsigned getPointerPrefAlignment(unsigned AS=0) const
Return target&#39;s alignment for stack-based pointers FIXME: The defaults need to be removed once all of...
Definition: DataLayout.cpp:596
LLVM_ATTRIBUTE_ALWAYS_INLINE size_type size() const
Definition: SmallVector.h:136
bool doesSupportDebugInformation() const
Definition: MCAsmInfo.h:548
bool hasSingleParameterDotFile() const
Definition: MCAsmInfo.h:524
bool doFinalization(Module &M) override
Shut down the asmprinter.
SmallVector< std::unique_ptr< GCStrategy >, 1 >::const_iterator iterator
Definition: GCMetadata.h:183
Same, but only replaced by something equivalent.
Definition: GlobalValue.h:54
static void emitGlobalConstantDataSequential(const DataLayout &DL, const ConstantDataSequential *CDS, AsmPrinter &AP)
bool isOSBinFormatELF() const
Tests whether the OS uses the ELF binary format.
Definition: Triple.h:572
virtual int getFrameIndexReference(const MachineFunction &MF, int FI, unsigned &FrameReg) const
getFrameIndexReference - This method should return the base register and offset used to reference a f...
MCContext & OutContext
This is the context for the output file that we are streaming.
Definition: AsmPrinter.h:88
static cl::opt< bool > PrintSchedule("print-schedule", cl::Hidden, cl::init(false), cl::desc("Print 'sched: [latency:throughput]' in .s output"))
virtual const TargetRegisterInfo * getRegisterInfo() const
getRegisterInfo - If register information is available, return it.
bool hasLinkOnceDirective() const
Definition: MCAsmInfo.h:536
bool canBeOmittedFromSymbolTable(const GlobalValue *GV)
True if GV can be left out of the object symbol table.
Definition: ObjectUtils.h:22
.watchos_version_min
Definition: MCDirectives.h:68
unsigned getLoopDepth() const
Return the nesting level of this loop.
Definition: LoopInfo.h:96
Available for inspection, not emission.
Definition: GlobalValue.h:50
unsigned getNumWords() const
Get the number of words.
Definition: APInt.h:1495
unsigned getNumElements() const
Random access to the elements.
Definition: DerivedTypes.h:313
const StructLayout * getStructLayout(StructType *Ty) const
Returns a StructLayout object, indicating the alignment of the struct, its size, and the offsets of i...
Definition: DataLayout.cpp:562
bool EnablePrintSchedInfo
Enable print [latency:throughput] in output.
Definition: AsmPrinter.h:120
const MCSubtargetInfo & getSubtargetInfo() const
Return information about subtarget.
Definition: AsmPrinter.cpp:204
DWARF-like instruction based exceptions.
uint16_t getDwarfVersion() const
unsigned getReg() const
getReg - Returns the register number.
LLVM_NODISCARD LLVM_ATTRIBUTE_ALWAYS_INLINE size_t size() const
size - Get the string size.
Definition: StringRef.h:138
CFIMoveType needsCFIMoves() const
Definition: AsmPrinter.cpp:904
virtual void EmitBytes(StringRef Data)
Emit the bytes in Data into the output.
Definition: MCStreamer.cpp:832
virtual void EmitJumpTableInfo()
Print assembly representations of the jump tables used by the current function to the current output ...
static int isRepeatedByteSequence(const ConstantDataSequential *V)
isRepeatedByteSequence - Determine whether the given value is composed of a repeated sequence of iden...
Collects and handles dwarf debug information.
Definition: DwarfDebug.h:203
bool hasAvailableExternallyLinkage() const
Definition: GlobalValue.h:403
.ios_version_min
Definition: MCDirectives.h:65
virtual void EmitXXStructor(const DataLayout &DL, const Constant *CV)
Targets can override this to change how global constants that are part of a C++ static/global constru...
Definition: AsmPrinter.h:398
This file contains the declarations for metadata subclasses.
EK_Inline - Jump table entries are emitted inline at their point of use.
const MachineFunction * MF
The current machine function.
Definition: AsmPrinter.h:96
format_object< Ts... > format(const char *Fmt, const Ts &... Vals)
These are helper functions used to produce formatted output.
Definition: Format.h:124
virtual const TargetLowering * getTargetLowering() const
raw_ostream & indent(unsigned NumSpaces)
indent - Insert &#39;NumSpaces&#39; spaces.
bool hasDotTypeDotSizeDirective() const
Definition: MCAsmInfo.h:523
bool needsDwarfSectionOffsetDirective() const
Definition: MCAsmInfo.h:453
float convertToFloat() const
Definition: APFloat.h:1098
uint64_t getElementByteSize() const
Return the size (in bytes) of each element in the array/vector.
Definition: Constants.cpp:2301
bool isWatchOS() const
Is this an Apple watchOS triple.
Definition: Triple.h:456
Like Internal, but omit from symbol table.
Definition: GlobalValue.h:57
Externally visible function.
Definition: GlobalValue.h:49
uint64_t getSize() const
Return the size in bytes of the memory reference.
bool IsConstantOffsetFromGlobal(Constant *C, GlobalValue *&GV, APInt &Offset, const DataLayout &DL)
If this constant is a constant offset from a global, return the global and the constant.
#define DEBUG_TYPE
Definition: AsmPrinter.cpp:112
bool hasPrologueData() const
Check whether this function has prologue data.
Definition: Function.h:644
bool isAbsolute() const
Is this an absolute (as opposed to relocatable) value.
Definition: MCValue.h:52
static const char *const DWARFGroupName
Definition: AsmPrinter.cpp:114
A raw_ostream that writes to an SmallVector or SmallString.
Definition: raw_ostream.h:490
virtual void EmitConstantPool()
Print to the current output stream assembly representations of the constants in the constant pool MCP...
STATISTIC(NumFunctions, "Total number of functions")
Metadata node.
Definition: Metadata.h:862
static const MCBinaryExpr * createAnd(const MCExpr *LHS, const MCExpr *RHS, MCContext &Ctx)
Definition: MCExpr.h:448
setjmp/longjmp based exceptions
const MDOperand & getOperand(unsigned I) const
Definition: Metadata.h:1067
.macosx_version_min
Definition: MCDirectives.h:66
ELFYAML::ELF_STV Visibility
Definition: ELFYAML.cpp:694
APInt zextOrTrunc(unsigned width) const
Zero extend or truncate to width.
Definition: APInt.cpp:883
static const MCBinaryExpr * createMul(const MCExpr *LHS, const MCExpr *RHS, MCContext &Ctx)
Definition: MCExpr.h:498
std::pair< const GlobalVariable *, unsigned > GOTEquivUsePair
Map global GOT equivalent MCSymbols to GlobalVariables and keep track of its number of uses by other ...
Definition: AsmPrinter.h:116
static void emitKill(const MachineInstr *MI, AsmPrinter &AP)
Definition: AsmPrinter.cpp:798
static const char *const DWARFGroupDescription
Definition: AsmPrinter.cpp:115
bool isImm() const
isImm - Tests if this is a MO_Immediate operand.
bool hasIdentDirective() const
Definition: MCAsmInfo.h:525
bool isPPC_FP128Ty() const
Return true if this is powerpc long double.
Definition: Type.h:159
Tentative definitions.
Definition: GlobalValue.h:59
unsigned getBitWidth() const
getBitWidth - Return the bitwidth of this constant.
Definition: Constants.h:143
bool hasMachoZeroFillDirective() const
Definition: MCAsmInfo.h:459
WinEH::EncodingType getWinEHEncodingType() const
Definition: MCAsmInfo.h:555
virtual void EmitInstruction(const MCInst &Inst, const MCSubtargetInfo &STI, bool PrintSchedInfo=false)
Emit the given Instruction into the current section.
Definition: MCStreamer.cpp:780
unsigned getBitWidth() const
Return the number of bits in the APInt.
Definition: APInt.h:1488
Constant * getPrologueData() const
Get the prologue data associated with this function.
Definition: Function.cpp:1275
virtual MCSection * getStaticDtorSection(unsigned Priority, const MCSymbol *KeySym) const
const Triple & getTargetTriple() const
getTargetTriple - Return the target triple string.
The address of a basic block.
Definition: Constants.h:813
void emit(DiagnosticInfoOptimizationBase &OptDiag)
Emit an optimization remark.
static const MCBinaryExpr * createXor(const MCExpr *LHS, const MCExpr *RHS, MCContext &Ctx)
Definition: MCExpr.h:533
bool hasSection() const
Definition: GlobalValue.h:256
AnalysisUsage & addRequired()
int64_t getConstant() const
Definition: MCValue.h:46
Used to lazily calculate structure layout information for a target machine, based on the DataLayout s...
Definition: DataLayout.h:493
const MCSymbolRefExpr * getSymB() const
Definition: MCValue.h:48
virtual void EmitDebugThreadLocal(const MCExpr *Value, unsigned Size) const
Emit the directive and value for debug thread local expression.
Definition: AsmPrinter.cpp:623
static void emitGlobalConstantFP(const ConstantFP *CFP, AsmPrinter &AP)
A tuple of MDNodes.
Definition: Metadata.h:1316
bool hasPrefixData() const
Check whether this function has prefix data.
Definition: Function.h:635
A description of a memory reference used in the backend.
static Constant * getIntegerCast(Constant *C, Type *Ty, bool isSigned)
Create a ZExt, Bitcast or Trunc for integer -> integer casts.
Definition: Constants.cpp:1518
Definition: BitVector.h:920
Emits exception handling directives.
Definition: EHStreamer.h:32
StringRef getName() const
MCSymbol * createLinkerPrivateTempSymbol()
Create and return a new linker temporary symbol with a unique but unspecified name.
Definition: MCContext.cpp:209
bool isMachineConstantPoolEntry() const
isMachineConstantPoolEntry - Return true if the MachineConstantPoolEntry is indeed a target specific ...
Type * getPointerElementType() const
Definition: Type.h:373
This file declares the MachineConstantPool class which is an abstract constant pool to keep track of ...
const DataLayout & getDataLayout() const
Get the data layout for the module&#39;s target platform.
Definition: Module.cpp:361
MachineFunctionPass - This class adapts the FunctionPass interface to allow convenient creation of pa...
virtual void EmitEndOfAsmFile(Module &)
This virtual method can be overridden by targets that want to emit something at the end of their file...
Definition: AsmPrinter.h:365
Twine - A lightweight data structure for efficiently representing the concatenation of temporary valu...
Definition: Twine.h:81
bool isStringAttribute() const
Return true if the attribute is a string (target-dependent) attribute.
Definition: Attributes.cpp:170
const HexagonInstrInfo * TII
static void emitGlobalConstantStruct(const DataLayout &DL, const ConstantStruct *CS, AsmPrinter &AP, const Constant *BaseCV, uint64_t Offset)
unsigned getPointerTypeSize(Type *Ty) const
Definition: DataLayout.h:357
const ConstantFP * getFPImm() const
unsigned getNumOperands() const
Access to explicit operands of the instruction.
Definition: MachineInstr.h:282
StringRef getRawDataValues() const
Return the raw, underlying, bytes of this data.
Definition: Constants.cpp:2275
Class to represent struct types.
Definition: DerivedTypes.h:201
This class is basically a combination of TimeRegion and Timer.
Definition: Timer.h:160
bool isKnownWindowsMSVCEnvironment() const
Checks if the environment is MSVC.
Definition: Triple.h:514
bool isConstant() const
If the value is a global constant, its value is immutable throughout the runtime execution of the pro...
static const MCBinaryExpr * createDiv(const MCExpr *LHS, const MCExpr *RHS, MCContext &Ctx)
Definition: MCExpr.h:453
Base class for the full range of assembler expressions which are needed for parsing.
Definition: MCExpr.h:36
Reg
All possible values of the reg field in the ModR/M byte.
iterator_range< iterator > terminators()
unsigned getAlignment() const
getAlignment - Return the alignment (log2, not bytes) of the function.
Represent a reference to a symbol from inside an expression.
Definition: MCExpr.h:165
The MachineFrameInfo class represents an abstract stack frame until prolog/epilog code is inserted...
void getNameWithPrefix(SmallVectorImpl< char > &Name, const GlobalValue *GV, Mangler &Mang, bool MayAlwaysUsePrivate=false) const
bool getCommDirectiveSupportsAlignment() const
MCSection * getBSSSection() const
SmallVector< XRayFunctionEntry, 4 > Sleds
Definition: AsmPrinter.h:250
.local (ELF)
Definition: MCDirectives.h:35
An analysis pass which caches information about the entire Module.
Definition: GCMetadata.h:154
MCSection * getDataSection() const
const char * getWeakRefDirective() const
Definition: MCAsmInfo.h:529
void EmitAlignment(unsigned NumBits, const GlobalObject *GO=nullptr) const
Emit an alignment directive to the specified power of two boundary.
uint64_t getNumElements() const
Definition: DerivedTypes.h:359
.no_dead_strip (MachO)
Definition: MCDirectives.h:36
This class defines information used to lower LLVM code to legal SelectionDAG operators that the targe...
unsigned getCFIIndex() const
This file implements a class to represent arbitrary precision integral constant values and operations...
bool hasCommonLinkage() const
Definition: GlobalValue.h:420
INLINEASM - Represents an inline asm block.
Definition: ISDOpcodes.h:633
Constant * getPrefixData() const
Get the prefix data associated with this function.
Definition: Function.cpp:1265
BlockT * getHeader() const
Definition: LoopInfo.h:103
static const char *const CodeViewLineTablesGroupName
Definition: AsmPrinter.cpp:120
unsigned getPointerSize() const
Return the pointer size from the TargetMachine.
Definition: AsmPrinter.cpp:202
Diagnostic information for optimization analysis remarks.
void emitXRayTable()
Emit a table with all XRay instrumentation points.
Context object for machine code objects.
Definition: MCContext.h:59
auto reverse(ContainerTy &&C, typename std::enable_if< has_rbegin< ContainerTy >::value >::type *=nullptr) -> decltype(make_range(C.rbegin(), C.rend()))
Definition: STLExtras.h:250
bool hasExternalLinkage() const
Definition: GlobalValue.h:402
unsigned getEntryAlignment(const DataLayout &TD) const
getEntryAlignment - Return the alignment of each entry in the jump table.
Constant * ConstantFoldConstant(const Constant *C, const DataLayout &DL, const TargetLibraryInfo *TLI=nullptr)
ConstantFoldConstant - Attempt to fold the constant using the specified DataLayout.
static bool needFuncLabelsForEHOrDebugInfo(const MachineFunction &MF, MachineModuleInfo *MMI)
Definition: AsmPrinter.cpp:954
static const MCBinaryExpr * createShl(const MCExpr *LHS, const MCExpr *RHS, MCContext &Ctx)
Definition: MCExpr.h:513
void getAnalysisUsage(AnalysisUsage &AU) const override
Record analysis usage.
Definition: AsmPrinter.cpp:218
bool isNullValue() const
Return true if this is the value that would be returned by getNullValue.
Definition: Constants.cpp:86
A constant value that is initialized with an expression using other constant values.
Definition: Constants.h:862
void EmitFunctionBody()
This method emits the body and trailer for a function.
Definition: AsmPrinter.cpp:969
int64_t getSExtValue() const
Get sign extended value.
Definition: APInt.h:1554
const std::string & getName() const
Return the name of the GC strategy.
Definition: GCStrategy.h:104
#define F(x, y, z)
Definition: MD5.cpp:55
Type * getType() const
All values are typed, get the type of this value.
Definition: Value.h:245
opStatus convert(const fltSemantics &ToSemantics, roundingMode RM, bool *losesInfo)
Definition: APFloat.cpp:4441
static const MCBinaryExpr * createSub(const MCExpr *LHS, const MCExpr *RHS, MCContext &Ctx)
Definition: MCExpr.h:528
MCSectionMachO * getMachOSection(StringRef Segment, StringRef Section, unsigned TypeAndAttributes, unsigned Reserved2, SectionKind K, const char *BeginSymName=nullptr)
Return the MCSection for the specified mach-o section.
Definition: MCContext.cpp:271
void toString(SmallVectorImpl< char > &Str, unsigned FormatPrecision=0, unsigned FormatMaxPadding=3, bool TruncateZero=true) const
Definition: APFloat.h:1152
ConstantDataSequential - A vector or array constant whose element type is a simple 1/2/4/8-byte integ...
Definition: Constants.h:565
bool isPositionIndependent() const
Definition: AsmPrinter.cpp:182
EK_LabelDifference32 - Each entry is the address of the block minus the address of the jump table...
bool supportGOTPCRelWithOffset() const
Target GOT "PC"-relative relocation supports encoding an additional binary expression with an offset...
#define T
.type _foo, STT_GNU_IFUNC
Definition: MCDirectives.h:24
VisibilityTypes
An enumeration for the kinds of visibility of global values.
Definition: GlobalValue.h:63
void EmitInt16(int Value) const
Emit a short directive and value.
.alt_entry (MachO)
Definition: MCDirectives.h:38
LLVM_NODISCARD LLVM_ATTRIBUTE_ALWAYS_INLINE bool empty() const
empty - Check if the string is empty.
Definition: StringRef.h:133
NamedMDNode * getNamedMetadata(const Twine &Name) const
Return the first NamedMDNode in the module with the specified name.
Definition: Module.cpp:242
bool isBSSLocal() const
Definition: SectionKind.h:161
EK_BlockAddress - Each entry is a plain address of block, e.g.
const APInt & getValue() const
Return the constant as an APInt value reference.
Definition: Constants.h:138
BasicBlock * getBasicBlock() const
Definition: Constants.h:840
bool isFPImm() const
isFPImm - Tests if this is a MO_FPImmediate operand.
bool hasFunctionAlignment() const
Definition: MCAsmInfo.h:522
bool hasPersonalityFn() const
Check whether this function has a personality function.
Definition: Function.h:626
This class is a data container for one entry in a MachineConstantPool.
virtual const MCExpr * LowerCustomJumpTableEntry(const MachineJumpTableInfo *, const MachineBasicBlock *, unsigned, MCContext &) const
int getNumber() const
MachineBasicBlocks are uniquely numbered at the function level, unless they&#39;re not in a MachineFuncti...
LinkageTypes getLinkage() const
Definition: GlobalValue.h:430
virtual const TargetInstrInfo * getInstrInfo() const
static const fltSemantics & IEEEdouble() LLVM_READNONE
Definition: APFloat.cpp:122
StringRef getTargetCPU() const
ArrayRef< MCSymbol * > getAddrLabelSymbolToEmit(const BasicBlock *BB)
Return the symbol to be used for the specified basic block when its address is taken.
unsigned getAlignment() const
Definition: Globals.cpp:96
void printOffset(int64_t Offset, raw_ostream &OS) const
This is just convenient handler for printing offsets.
static const MCBinaryExpr * createAdd(const MCExpr *LHS, const MCExpr *RHS, MCContext &Ctx)
Definition: MCExpr.h:443
bool hasLinkOnceLinkage() const
Definition: GlobalValue.h:406
bool isWindowsItaniumEnvironment() const
Definition: Triple.h:522
Printable PrintReg(unsigned Reg, const TargetRegisterInfo *TRI=nullptr, unsigned SubRegIdx=0)
Prints virtual and physical registers with or without a TRI instance.
bool isVerbose() const
Return true if assembly output should contain comments.
Definition: AsmPrinter.h:191
bool hasNoDeadStrip() const
Definition: MCAsmInfo.h:526
const std::string & str() const
Definition: Triple.h:349
Type * getElementType() const
Return the element type of the array/vector.
Definition: Constants.cpp:2271
const char * Name
void emitGlobalGOTEquivs()
Constant expressions using GOT equivalent globals may not be eligible for PC relative GOT entry conve...
MachineModuleInfo * MMI
This is a pointer to the current MachineModuleInfo.
Definition: AsmPrinter.h:99
Value * getOperand(unsigned i) const
Definition: User.h:154
Instances of this class represent a single low-level machine instruction.
Definition: MCInst.h:159
const DataLayout & getDataLayout() const
Return the DataLayout attached to the Module associated to this MF.
static void handleIndirectSymViaGOTPCRel(AsmPrinter &AP, const MCExpr **ME, const Constant *BaseCst, uint64_t Offset)
Transform a not absolute MCExpr containing a reference to a GOT equivalent global, by a target specific GOT pc relative access to the final symbol.
const std::string & getSourceFileName() const
Get the module&#39;s original source file name.
Definition: Module.h:214
static bool canBeHidden(const GlobalValue *GV, const MCAsmInfo &MAI)
Definition: AsmPrinter.cpp:367
static void emitGlobalConstantArray(const DataLayout &DL, const ConstantArray *CA, AsmPrinter &AP, const Constant *BaseCV, uint64_t Offset)
void EmitLabelPlusOffset(const MCSymbol *Label, uint64_t Offset, unsigned Size, bool IsSectionRelative=false) const
Emit something like ".long Label+Offset" where the size in bytes of the directive is specified by Siz...
unsigned getCodeViewFlag() const
Returns the CodeView Version by checking module flags.
Definition: Module.cpp:460
TargetInstrInfo - Interface to description of machine instruction set.
bool hasAppendingLinkage() const
Definition: GlobalValue.h:413
void EmitInt32(int Value) const
Emit a long directive and value.
This class is intended to be used as a base class for asm properties and features specific to the tar...
Definition: MCAsmInfo.h:56
virtual unsigned isStoreToStackSlotPostFE(const MachineInstr &MI, int &FrameIndex) const
Check for post-frame ptr elimination stack locations as well.
===- MachineOptimizationRemarkEmitter.h - Opt Diagnostics -*- C++ -*-—===//
MCSection * getTLSExtraDataSection() const
bool isOSWindows() const
Tests whether the OS is Windows.
Definition: Triple.h:546
bool useStatepoints() const
Returns true if this strategy is expecting the use of gc.statepoints, and false otherwise.
Definition: GCStrategy.h:118
bool isFloatTy() const
Return true if this is &#39;float&#39;, a 32-bit IEEE fp type.
Definition: Type.h:147
ExternalWeak linkage description.
Definition: GlobalValue.h:58
virtual MCSection * getNonexecutableStackSection(MCContext &Ctx) const
Targets can implement this method to specify a section to switch to if the translation unit doesn&#39;t h...
Definition: MCAsmInfo.h:414
static bool emitDebugValueComment(const MachineInstr *MI, AsmPrinter &AP)
emitDebugValueComment - This method handles the target-independent form of DBG_VALUE, returning true if it was able to do so.
Definition: AsmPrinter.cpp:817
IntegerType * getIntPtrType(LLVMContext &C, unsigned AddressSpace=0) const
Returns an integer type with size at least as big as that of a pointer in the given address space...
Definition: DataLayout.cpp:702
unsigned getPreferredAlignmentLog(const GlobalVariable *GV) const
Returns the preferred alignment of the specified global, returned in log form.
Definition: DataLayout.cpp:784
#define P(N)
.data_region jt32
Definition: MCDirectives.h:60
Same, but only replaced by something equivalent.
Definition: GlobalValue.h:52
EK_GPRel64BlockAddress - Each entry is an address of block, encoded with a relocation as gp-relative...
initializer< Ty > init(const Ty &Val)
Definition: CommandLine.h:404
void EmitZeros(uint64_t NumBytes)
Emit NumBytes worth of zeros.
Definition: MCStreamer.cpp:181
Streaming machine code generation interface.
Definition: MCStreamer.h:167
virtual void EmitFunctionBodyEnd()
Targets can override this to emit stuff after the last basic block in the function.
Definition: AsmPrinter.h:373
static const char *const EHTimerDescription
Definition: AsmPrinter.cpp:119
MCSymbol * createTempSymbol(bool CanBeUnnamed=true)
Create and return a new assembler temporary symbol with a unique but unspecified name.
Definition: MCContext.cpp:215
EK_Custom32 - Each entry is a 32-bit value that is custom lowered by the TargetLowering::LowerCustomJ...
.weak_def_can_be_hidden (MachO)
Definition: MCDirectives.h:45
VisibilityTypes getVisibility() const
Definition: GlobalValue.h:220
MCSymbol * CurrentFnSym
The symbol for the current function.
Definition: AsmPrinter.h:107
bool getAsmPrinterFlag(CommentFlag Flag) const
Return whether an AsmPrinter flag is set.
Definition: MachineInstr.h:149
LLVM Basic Block Representation.
Definition: BasicBlock.h:59
const FunctionListType & getFunctionList() const
Get the Module&#39;s list of functions (constant).
Definition: Module.h:507
const MCAsmInfo * MAI
Target Asm Printer information.
Definition: AsmPrinter.h:84
The instances of the Type class are immutable: once they are created, they are never changed...
Definition: Type.h:46
const TargetSubtargetInfo & getSubtarget() const
getSubtarget - Return the subtarget for which this machine code is being compiled.
virtual bool shouldPutJumpTableInFunctionSection(bool UsesLabelDifference, const Function &F) const
void takeDeletedSymbolsForFunction(const Function *F, std::vector< MCSymbol *> &Result)
If the specified function has had any references to address-taken blocks generated, but the block got deleted, return the symbol now so we can emit it.
void getAnalysisUsage(AnalysisUsage &AU) const override
getAnalysisUsage - Subclasses that override getAnalysisUsage must call this.
bool isOSBinFormatCOFF() const
Tests whether the OS uses the COFF binary format.
Definition: Triple.h:577
.tvos_version_min
Definition: MCDirectives.h:67
AsmPrinter(TargetMachine &TM, std::unique_ptr< MCStreamer > Streamer)
Definition: AsmPrinter.cpp:165
MachineFrameInfo & getFrameInfo()
getFrameInfo - Return the frame info object for the current function.
bool needsLocalForSize() const
Definition: MCAsmInfo.h:474
This is an important base class in LLVM.
Definition: Constant.h:42
bool hasEHFunclets() const
unsigned getPointerSize(unsigned AS=0) const
Layout pointer size FIXME: The defaults need to be removed once all of the backends/clients are updat...
Definition: DataLayout.cpp:605
LLVM_ATTRIBUTE_ALWAYS_INLINE iterator begin()
Definition: SmallVector.h:116
This file contains the declarations for the subclasses of Constant, which represent the different fla...
void recordSled(MCSymbol *Sled, const MachineInstr &MI, SledKind Kind)
MCSymbol * getAddrLabelSymbol(const BasicBlock *BB)
Return the symbol to be used for the specified basic block when its address is taken.
virtual MCSection * getSectionForConstant(const DataLayout &DL, SectionKind Kind, const Constant *C, unsigned &Align) const
Given a constant with the SectionKind, return a section that it should be placed in.
ConstantFP - Floating Point Values [float, double].
Definition: Constants.h:264
virtual bool isBlockOnlyReachableByFallthrough(const MachineBasicBlock *MBB) const
Return true if the basic block has exactly one predecessor and the control transfer mechanism between...
std::pair< iterator, bool > insert(PtrType Ptr)
Inserts Ptr if and only if there is no element in the container equal to Ptr.
Definition: SmallPtrSet.h:372
virtual void emitModuleMetadata(MCStreamer &Streamer, Module &M, const TargetMachine &TM) const
Emit the module-level metadata that the platform cares about.
MCSymbol * getSymbol(const GlobalValue *GV) const
static const MCBinaryExpr * createOr(const MCExpr *LHS, const MCExpr *RHS, MCContext &Ctx)
Definition: MCExpr.h:508
unsigned getAlignment() const
Return alignment of the basic block.
double convertToDouble() const
Definition: APFloat.h:1097
TargetMachine & TM
Target machine description.
Definition: AsmPrinter.h:80
This class is intended to be used as a driving class for all asm writers.
Definition: AsmPrinter.h:76
bool isCImm() const
isCImm - Test if this is a MO_CImmediate operand.
void getNameWithPrefix(SmallVectorImpl< char > &Name, const GlobalValue *GV) const
Definition: AsmPrinter.cpp:415
EHPersonality classifyEHPersonality(const Value *Pers)
See if the given exception handling personality function is one that we understand.
MCSymbol * getSymbolWithGlobalValueBase(const GlobalValue *GV, StringRef Suffix, const TargetMachine &TM) const
Return the MCSymbol for a private symbol with global value name as its base, with the specified suffi...
Represent the analysis usage information of a pass.
This file declares a class to represent arbitrary precision floating point values and provide a varie...
const MCSymbolRefExpr * getSymA() const
Definition: MCValue.h:47
void getWatchOSVersion(unsigned &Major, unsigned &Minor, unsigned &Micro) const
getWatchOSVersion - Parse the version number as with getOSVersion.
Definition: Triple.cpp:1070
bool hasWeakDefCanBeHiddenDirective() const
Definition: MCAsmInfo.h:532
static bool isDiscardableIfUnused(LinkageTypes Linkage)
Whether the definition of this global may be discarded if it is not used in its compilation unit...
Definition: GlobalValue.h:341
MCSymbol * getJTISymbol(unsigned JTI, MCContext &Ctx, bool isLinkerPrivate=false) const
getJTISymbol - Return the MCSymbol for the specified non-empty jump table.
SectionKind - This is a simple POD value that classifies the properties of a section.
Definition: SectionKind.h:23
LCOMM::LCOMMType getLCOMMDirectiveAlignmentType() const
Definition: MCAsmInfo.h:518
const Triple & getTargetTriple() const
bool useAssignmentForEHBegin() const
Definition: MCAsmInfo.h:473
op_range operands()
Definition: User.h:222
bool hasLinkerPrivateGlobalPrefix() const
Definition: DataLayout.h:259
static void PrintChildLoopComment(raw_ostream &OS, const MachineLoop *Loop, unsigned FunctionNumber)
PrintChildLoopComment - Print comments about child loops within the loop for this basic block...
DenseMap< GCStrategy *, std::unique_ptr< GCMetadataPrinter > > gcp_map_type
Definition: AsmPrinter.cpp:132
self_iterator getIterator()
Definition: ilist_node.h:82
~AsmPrinter() override
Definition: AsmPrinter.cpp:171
Ty & getObjFileInfo()
Keep track of various per-function pieces of information for backends that would like to do so...
Constant Vector Declarations.
Definition: Constants.h:491
MachineConstantPool * getConstantPool()
getConstantPool - Return the constant pool object for the current function.
bool hasSubsectionsViaSymbols() const
Definition: MCAsmInfo.h:396
void emitFrameAlloc(const MachineInstr &MI)
Definition: AsmPrinter.cpp:944
.weak_reference (MachO)
Definition: MCDirectives.h:44
bool isOSBinFormatMachO() const
Tests whether the environment is MachO.
Definition: Triple.h:582
void computeGlobalGOTEquivs(Module &M)
Unnamed constant global variables solely contaning a pointer to another globals variable act like a g...
const Target & getTarget() const
static const char *const EHTimerName
Definition: AsmPrinter.cpp:118
bool hasWeakDefDirective() const
Definition: MCAsmInfo.h:530
bool isSplat(unsigned SplatSizeInBits) const
Check if the APInt consists of a repeated bit pattern.
Definition: APInt.cpp:501
bool hasAddressTaken() const
Test whether this block is potentially the target of an indirect branch.
const Value * stripPointerCasts() const
Strip off pointer casts, all-zero GEPs, and aliases.
Definition: Value.cpp:527
Abstract base class for all machine specific constantpool value subclasses.
static void emitGlobalConstantVector(const DataLayout &DL, const ConstantVector *CV, AsmPrinter &AP)
virtual MCSymbol * GetCPISymbol(unsigned CPID) const
Return the symbol for the specified constant pool entry.
unsigned getOSMajorVersion() const
getOSMajorVersion - Return just the major version number, this is specialized because it is a common ...
Definition: Triple.h:322
unsigned getDwarfVersion() const
Returns the Dwarf Version by checking module flags.
Definition: Module.cpp:453
virtual void markFunctionEnd()
bool isThreadBSS() const
Definition: SectionKind.h:153
void printAsOperand(raw_ostream &O, bool PrintType=true, const Module *M=nullptr) const
Print the name of this Value out to the specified raw_ostream.
Definition: AsmWriter.cpp:3538
std::string & str()
Flushes the stream contents to the target string and returns the string&#39;s reference.
Definition: raw_ostream.h:479
#define llvm_unreachable(msg)
Marks that the current location is not supposed to be reachable.
Windows x64, Windows Itanium (IA-64)
StringRef OperationEncodingString(unsigned Encoding)
Definition: Dwarf.cpp:138
static void PrintParentLoopComment(raw_ostream &OS, const MachineLoop *Loop, unsigned FunctionNumber)
PrintParentLoopComment - Print comments about parent loops of this one.
const DIExpression * getDebugExpression() const
Return the complex address expression referenced by this DBG_VALUE instruction.
Triple - Helper class for working with autoconf configuration names.
Definition: Triple.h:44
EH_LABEL - Represents a label in mid basic block used to track locations needed for debug and excepti...
Definition: ISDOpcodes.h:638
iterator_range< expr_op_iterator > expr_ops() const
bool hasWeakLinkage() const
Definition: GlobalValue.h:410
bool isBSS() const
Definition: SectionKind.h:160
const std::vector< MachineConstantPoolEntry > & getConstants() const
const APFloat & getValueAPF() const
Definition: Constants.h:294
bool hasAddressTaken() const
Returns true if there are any uses of this basic block other than direct branches, switches, etc.
Definition: BasicBlock.h:376
unsigned getFunctionNumber() const
Return a unique ID for the current function.
Definition: AsmPrinter.cpp:188
const std::vector< LandingPadInfo > & getLandingPads() const
Return a reference to the landing pad info for the current function.
unsigned getNumOperands() const
Definition: User.h:176
void emitCFIInstruction(const MachineInstr &MI)
Definition: AsmPrinter.cpp:919
virtual void emitImplicitDef(const MachineInstr *MI) const
Targets can override this to customize the output of IMPLICIT_DEF instructions in verbose mode...
Definition: AsmPrinter.cpp:786
MCSymbol * GetBlockAddressSymbol(const BlockAddress *BA) const
Return the MCSymbol used to satisfy BlockAddress uses of the specified basic block.
ConstMIBundleOperands - Iterate over all operands in a const bundle of machine instructions.
SmallPtrSet - This class implements a set which is optimized for holding SmallSize or less elements...
Definition: SmallPtrSet.h:423
virtual const MCExpr * lowerRelativeReference(const GlobalValue *LHS, const GlobalValue *RHS, const TargetMachine &TM) const
uint64_t getLimitedValue(uint64_t Limit=~0ULL) const
getLimitedValue - If the value is smaller than the specified limit, return it, otherwise return the l...
Definition: Constants.h:251
#define E
Definition: LargeTest.cpp:27
This is the shared class of boolean and integer constants.
Definition: Constants.h:84
static iterator begin()
virtual bool hasLoadFromStackSlot(const MachineInstr &MI, const MachineMemOperand *&MMO, int &FrameIndex) const
If the specified machine instruction has a load from a stack slot, return true along with the FrameIn...
virtual TargetLoweringObjectFile * getObjFileLowering() const
SymbolListTy GetGVStubList()
Accessor methods to return the set of stubs in sorted order.
MapVector< const MCSymbol *, GOTEquivUsePair > GlobalGOTEquivs
Definition: AsmPrinter.h:117
mmo_iterator memoperands_begin() const
Access to memory operands of the instruction.
Definition: MachineInstr.h:363
bool getMacOSXVersion(unsigned &Major, unsigned &Minor, unsigned &Micro) const
getMacOSXVersion - Parse the version number as with getOSVersion and then translate generic "darwin" ...
Definition: Triple.cpp:1003
virtual const MCExpr * getIndirectSymViaGOTPCRel(const MCSymbol *Sym, const MCValue &MV, int64_t Offset, MachineModuleInfo *MMI, MCStreamer &Streamer) const
Get the target specific PC relative GOT entry relocation.
virtual bool isVirtualSection() const =0
Check whether this section is "virtual", that is has no actual object file contents.
static const char *const CodeViewLineTablesGroupDescription
Definition: AsmPrinter.cpp:121
MCSymbol * getSymbol(const GlobalValue *GV) const
Definition: AsmPrinter.cpp:420
const MCSymbol & getSymbol() const
Definition: MCExpr.h:318
virtual const MCExpr * lowerConstant(const Constant *CV)
Lower the specified LLVM Constant to an MCExpr.
virtual void EmitInstruction(const MachineInstr *)
Targets should implement this to emit instructions.
Definition: AsmPrinter.h:385
bool isUndefined(bool SetUsed=true) const
isUndefined - Check if this symbol undefined (i.e., implicitly defined).
Definition: MCSymbol.h:260
MachineOperand class - Representation of each machine instruction operand.
bool isCommon() const
Definition: SectionKind.h:164
This is a &#39;vector&#39; (really, a variable-sized array), optimized for the case when the array is small...
Definition: SmallVector.h:864
Keep one copy of function when linking (inline)
Definition: GlobalValue.h:51
uint64_t getElementAsInteger(unsigned i) const
If this is a sequential container of integers (of any size), return the specified element in the low ...
Definition: Constants.cpp:2564
StringRef getAsString() const
If this array is isString(), then this method returns the array as a StringRef.
Definition: Constants.h:647
Module.h This file contains the declarations for the Module class.
void beginModule()
Emit all Dwarf sections that should come prior to the content.
Definition: DwarfDebug.cpp:536
Information about stack frame layout on the target.
const DataFlowGraph & G
Definition: RDFGraph.cpp:206
void EmitToStreamer(MCStreamer &S, const MCInst &Inst)
Definition: AsmPrinter.cpp:209
bool EmitSpecialLLVMGlobal(const GlobalVariable *GV)
Check to see if the specified global is a special global used by LLVM.
static SectionKind getReadOnlyWithRel()
Definition: SectionKind.h:203
const size_t N
uint64_t getSizeInBytes() const
Definition: DataLayout.h:501
StringRef str()
Return a StringRef for the vector contents.
Definition: raw_ostream.h:515
bool usesMetadata() const
If set, appropriate metadata tables must be emitted by the back-end (assembler, JIT, or otherwise).
Definition: GCStrategy.h:162
bool hasGlobalUnnamedAddr() const
Definition: GlobalValue.h:187
MCSymbolAttr
Definition: MCDirectives.h:19
void print(raw_ostream &OS, bool isSigned) const
Definition: APInt.cpp:2133
int64_t getImm() const
unsigned pred_size() const
bool isLayoutSuccessor(const MachineBasicBlock *MBB) const
Return true if the specified MBB will be emitted immediately after this block, such that if this bloc...
DWARF expression.
Collects and handles line tables information in a CodeView format.
Definition: CodeViewDebug.h:52
bool needsUnwindTableEntry() const
True if this function needs an unwind table.
Definition: Function.h:497
unsigned Log2_32(uint32_t Value)
Return the floor log base 2 of the specified value, -1 if the value is zero.
Definition: MathExtras.h:531
Class for arbitrary precision integers.
Definition: APInt.h:69
ConstantArray - Constant Array Declarations.
Definition: Constants.h:405
static StringRef dropLLVMManglingEscape(StringRef Name)
If the given string begins with the GlobalValue name mangling escape character &#39;\1&#39;, drop it.
Definition: GlobalValue.h:451
virtual void EmitFunctionBodyStart()
Targets can override this to emit stuff before the first basic block in the function.
Definition: AsmPrinter.h:369
MCSymbol * getCurExceptionSym()
virtual bool hasStoreToStackSlot(const MachineInstr &MI, const MachineMemOperand *&MMO, int &FrameIndex) const
If the specified machine instruction has a store to a stack slot, return true along with the FrameInd...
LinkageTypes
An enumeration for the kinds of linkage for global values.
Definition: GlobalValue.h:48
unsigned getEntrySize(const DataLayout &TD) const
getEntrySize - Return the size of each entry in the jump table.
unsigned EmulatedTLS
EmulatedTLS - This flag enables emulated TLS model, using emutls function in the runtime library...
void setPreservesAll()
Set by analyses that do not transform their input at all.
iterator_range< user_iterator > users()
Definition: Value.h:395
unsigned getNumElements() const
ArrayType * getType() const
Specialize the getType() method to always return an ArrayType, which reduces the amount of casting ne...
Definition: Constants.h:424
MCSubtargetInfo * createMCSubtargetInfo(StringRef TheTriple, StringRef CPU, StringRef Features) const
createMCSubtargetInfo - Create a MCSubtargetInfo implementation.
FunctionNumber(functionNumber)
Definition: LLParser.cpp:2511
constexpr char Size[]
Key for Kernel::Arg::Metadata::mSize.
iterator end() const
Definition: GCMetadata.h:197
const MachineBasicBlock * getParent() const
Definition: MachineInstr.h:139
MachineModuleInfoELF - This is a MachineModuleInfoImpl implementation for ELF targets.
TargetSubtargetInfo - Generic base class for all target subtargets.
Iterators for registry entries.
Definition: Registry.h:84
virtual void EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV)
const uint64_t * getRawData() const
This function returns a pointer to the internal storage of the APInt.
Definition: APInt.h:668
uint64_t getTypeAllocSize(Type *Ty) const
Returns the offset in bytes between successive objects of the specified type, including alignment pad...
Definition: DataLayout.h:405
LoopT * getParentLoop() const
Definition: LoopInfo.h:104
Representation of each machine instruction.
Definition: MachineInstr.h:59
static void emitGlobalConstantImpl(const DataLayout &DL, const Constant *C, AsmPrinter &AP, const Constant *BaseCV=nullptr, uint64_t Offset=0)
const MachineFunction * getParent() const
Return the MachineFunction containing this basic block.
LLVM_ATTRIBUTE_ALWAYS_INLINE iterator end()
Definition: SmallVector.h:120
bool doInitialization(Module &M) override
Set up the AsmPrinter when we are working on a new module.
Definition: AsmPrinter.cpp:228
GCStrategy describes a garbage collector algorithm&#39;s code generation requirements, and provides overridable hooks for those needs which cannot be abstractly described.
Definition: GCStrategy.h:80
void SetupMachineFunction(MachineFunction &MF)
This should be called when a new MachineFunction is being processed from runOnMachineFunction.
bool isFunctionTy() const
True if this is an instance of FunctionType.
Definition: Type.h:212
MCSymbol * GetJTISymbol(unsigned JTID, bool isLinkerPrivate=false) const
Return the symbol for the specified jump table entry.
virtual unsigned isLoadFromStackSlotPostFE(const MachineInstr &MI, int &FrameIndex) const
Check for post-frame ptr elimination stack locations as well.
uint64_t getElementOffset(unsigned Idx) const
Definition: DataLayout.h:515
SequentialType * getType() const
Specialize the getType() method to always return a SequentialType, which reduces the amount of castin...
Definition: Constants.h:624
.type _foo,
Definition: MCDirectives.h:30
MCSymbol * getOrCreateSymbol(const Twine &Name)
Lookup the symbol inside with the specified Name.
Definition: MCContext.cpp:121
iterator begin() const
begin/end - Iterators for used strategies.
Definition: GCMetadata.h:196
void print(raw_ostream &O, bool IsForDebug=false, bool NoDetails=false) const
Print the current type.
Definition: AsmWriter.cpp:3433
bool isEHPad() const
Returns true if the block is a landing pad.
LLVM_NODISCARD bool empty() const
Definition: SmallVector.h:61
Represents a single loop in the control flow graph.
Definition: LoopInfo.h:360
bool isPositionIndependent() const
bool isEHFuncletEntry() const
Returns true if this is the entry block of an EH funclet.
virtual void EmitBasicBlockStart(const MachineBasicBlock &MBB) const
Targets can override this to emit stuff at the start of a basic block.
VectorType * getType() const
Specialize the getType() method to always return a VectorType, which reduces the amount of casting ne...
Definition: Constants.h:513
.type _foo, STT_FUNC # aka
Definition: MCDirectives.h:23
MCSymbol * GetJTSetSymbol(unsigned UID, unsigned MBBID) const
Return the symbol for the specified jump table .set FIXME: privatize to AsmPrinter.
StringRef getName() const
Return a constant reference to the value&#39;s name.
Definition: Value.cpp:218
TargetOptions Options
Definition: TargetMachine.h:95
virtual ~AsmPrinterHandler()
Pin vtable to this file.
const NodeList & List
Definition: RDFGraph.cpp:205
MCSymbol * getSymbol() const
Return the MCSymbol for this basic block.
static unsigned getNumGlobalVariableUses(const Constant *C)
Compute the number of Global Variables that uses a Constant.
#define I(x, y, z)
Definition: MD5.cpp:58
bool isDefined(bool SetUsed=true) const
isDefined - Check if this symbol is defined (i.e., it has an address).
Definition: MCSymbol.h:249
virtual void EmitBasicBlockEnd(const MachineBasicBlock &MBB)
Targets can override this to emit stuff at the end of a basic block.
Definition: AsmPrinter.h:382
constexpr char Align[]
Key for Kernel::Arg::Metadata::mAlign.
virtual const TargetFrameLowering * getFrameLowering() const
bool isFI() const
isFI - Tests if this is a MO_FrameIndex operand.
MCSubtargetInfo - Generic base class for all target subtargets.
SectionKind getSectionKind(const DataLayout *DL) const
const BasicBlock * getBasicBlock() const
Return the LLVM basic block that this instance corresponded to originally.
static gcp_map_type & getGCMap(void *&P)
Definition: AsmPrinter.cpp:133
static const MCBinaryExpr * createMod(const MCExpr *LHS, const MCExpr *RHS, MCContext &Ctx)
Definition: MCExpr.h:493
void EmitLabelDifference(const MCSymbol *Hi, const MCSymbol *Lo, unsigned Size) const
Emit something like ".long Hi-Lo" where the size in bytes of the directive is specified by Size and H...
LLVM_NODISCARD std::enable_if<!is_simple_type< Y >::value, typename cast_retty< X, const Y >::ret_type >::type dyn_cast(const Y &Val)
Definition: Casting.h:323
std::string getSchedInfoStr(const MachineInstr &MI) const override
Returns string representation of scheduler comment.
bool hasAltEntry() const
Definition: MCAsmInfo.h:527
Keep one copy of named function when linking (weak)
Definition: GlobalValue.h:53
Rename collisions when linking (static functions).
Definition: GlobalValue.h:56
const Constant * getIndirectSymbol() const
.weak_definition (MachO)
Definition: MCDirectives.h:43
static unsigned getGVAlignmentLog2(const GlobalValue *GV, const DataLayout &DL, unsigned InBits=0)
getGVAlignmentLog2 - Return the alignment to use for the specified global value in log2 form...
Definition: AsmPrinter.cpp:142
virtual void EmitFunctionEntryLabel()
EmitFunctionEntryLabel - Emit the label that is the entrypoint for the function.
Definition: AsmPrinter.cpp:716
const Module * getModule() const
bool isReg() const
isReg - Tests if this is a MO_Register operand.
std::vector< std::pair< MCSymbol *, StubValueTy > > SymbolListTy
const std::string & getModuleInlineAsm() const
Get any module-scope inline assembly blocks.
Definition: Module.h:241
const GlobalObject * getBaseObject() const
Definition: Globals.cpp:255
bool isDeclaration() const
Return true if the primary definition of this global value is outside of the current translation unit...
Definition: Globals.cpp:200
bool empty() const
Definition: LoopInfo.h:137
StringRef getName() const
getName - Get the symbol name.
Definition: MCSymbol.h:203
const Function * getFunction() const
getFunction - Return the LLVM function that this machine code represents
unsigned getCodePointerSize() const
Get the code pointer size in bytes.
Definition: MCAsmInfo.h:382
assert(ImpDefSCC.getReg()==AMDGPU::SCC &&ImpDefSCC.isDef())
A raw_ostream that writes to an std::string.
Definition: raw_ostream.h:463
MCSectionELF * getELFSection(const Twine &Section, unsigned Type, unsigned Flags)
Definition: MCContext.h:379
bool isTvOS() const
Is this an Apple tvOS triple.
Definition: Triple.h:451
MCSymbol * getMCSymbol() const
void EmitGlobalConstant(const DataLayout &DL, const Constant *CV)
Print a general LLVM constant to the .s file.
MCVersionMinType
Definition: MCDirectives.h:64
Module * getParent()
Get the module that this global value is contained inside of...
Definition: GlobalValue.h:545
LLVM Value Representation.
Definition: Value.h:73
Constant * getPersonalityFn() const
Get the personality function associated with this function.
Definition: Function.cpp:1255
JTEntryKind getEntryKind() const
uint64_t getTypeStoreSize(Type *Ty) const
Returns the maximum number of bytes that may be overwritten by storing the specified type...
Definition: DataLayout.h:388
bool isThreadLocal() const
Definition: SectionKind.h:149
bool hasInitializer() const
Definitions have initializers, declarations don&#39;t.
MachineLoop * getLoopFor(const MachineBasicBlock *BB) const
Return the innermost loop that BB lives in.
ExceptionHandling
Windows CE ARM, PowerPC, SH3, SH4.
static const char *const DbgTimerName
Definition: AsmPrinter.cpp:116
#define LLVM_FALLTHROUGH
LLVM_FALLTHROUGH - Mark fallthrough cases in switch statements.
Definition: Compiler.h:235
const DILocalVariable * getDebugVariable() const
Return the debug variable referenced by this DBG_VALUE instruction.
ExceptionHandling getExceptionHandlingType() const
Definition: MCAsmInfo.h:554
Attribute getFnAttribute(Attribute::AttrKind Kind) const
Return the attribute for the given attribute kind.
Definition: Function.h:262
static iterator end()
Definition: Registry.h:100
This class implements an extremely fast bulk output stream that can only output to a stream...
Definition: raw_ostream.h:44
Primary interface to the complete machine description for the target machine.
Definition: TargetMachine.h:56
uint64_t getTypeAllocSizeInBits(Type *Ty) const
Returns the offset in bits between successive objects of the specified type, including alignment padd...
Definition: DataLayout.h:415
MCSymbol * CurrentFnSymForSize
The symbol used to represent the start of the current function for the purpose of calculating its siz...
Definition: AsmPrinter.h:112
void getNameWithPrefix(raw_ostream &OS, const GlobalValue *GV, bool CannotUsePrivateLabel) const
Print the appropriate prefix and the specified global variable&#39;s name.
Definition: Mangler.cpp:109
const DataLayout & getDataLayout() const
Return information about data layout.
Definition: AsmPrinter.cpp:196
Type * getElementType() const
Definition: DerivedTypes.h:360
GCMetadataPrinter - Emits GC metadata as assembly code.
bool isThreadLocal() const
If the value is "Thread Local", its value isn&#39;t shared by the threads.
Definition: GlobalValue.h:233
virtual MCSection * getSectionForJumpTable(const Function &F, const TargetMachine &TM) const
iterator_range< global_iterator > globals()
Definition: Module.h:561
IRTranslator LLVM IR MI
MachineOptimizationRemarkEmitter * ORE
Optimization remark emitter.
Definition: AsmPrinter.h:102
bool hasOneUse() const
Return true if there is exactly one user of this value.
Definition: Value.h:408
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:49
A single uniqued string.
Definition: Metadata.h:602
EK_GPRel32BlockAddress - Each entry is an address of block, encoded with a relocation as gp-relative...
APInt bitcastToAPInt() const
Definition: APFloat.h:1094
static SectionKind getKindForGlobal(const GlobalObject *GO, const TargetMachine &TM)
Classify the specified global variable into a set of target independent categories embodied in Sectio...
unsigned getNumElements() const
Return the number of elements in the array or vector.
Definition: Constants.cpp:2294
No exception support.
bool TimePassesIsEnabled
If the user specifies the -time-passes argument on an LLVM tool command line then the value of this b...
Definition: IRReader.cpp:26
bool isBigEndian() const
Definition: DataLayout.h:217
const MCSection * getCurrentSection() const
Return the current section we are emitting to.
Definition: AsmPrinter.cpp:214
static void emitComments(const MachineInstr &MI, raw_ostream &CommentOS, AsmPrinter *AP)
emitComments - Pretty-print comments for instructions.
Definition: AsmPrinter.cpp:732
unsigned getOpcode() const
Definition: MCInst.h:168
MCSymbol * getSymbolWithGlobalValueBase(const GlobalValue *GV, StringRef Suffix) const
Return the MCSymbol for a private symbol with global value name as its base, with the specified suffi...
DILocalScope * getScope() const
Get the local scope for this variable.
unsigned getNumOperands() const
Return number of MDNode operands.
Definition: Metadata.h:1073
void emit(int, MCStreamer *, const MCSymbol *) const
const MachineJumpTableInfo * getJumpTableInfo() const
getJumpTableInfo - Return the jump table info object for the current function.
const MachineOperand & getOperand(unsigned i) const
Definition: MachineInstr.h:284
const ConstantInt * getCImm() const
bool isDoubleTy() const
Return true if this is &#39;double&#39;, a 64-bit IEEE fp type.
Definition: Type.h:150
bool isNoOpWithoutInvoke(EHPersonality Pers)
Return true if this personality may be safely removed if there are no invoke instructions remaining i...
MCSymbolAttr getHiddenDeclarationVisibilityAttr() const
Definition: MCAsmInfo.h:540
static SectionKind getReadOnly()
Definition: SectionKind.h:182
MCSymbol * createTempSymbol(const Twine &Name) const
MCSymbolAttr getProtectedVisibilityAttr() const
Definition: MCAsmInfo.h:544
StructType * getType() const
Specialization - reduce amount of casting.
Definition: Constants.h:478
const uint64_t Version
Definition: InstrProf.h:865
bool use_empty() const
Definition: Value.h:322
#define OP(n)
Definition: regex2.h:70
virtual const MCExpr * getPICJumpTableRelocBaseExpr(const MachineFunction *MF, unsigned JTI, MCContext &Ctx) const
This returns the relocation base for the given PIC jumptable, the same as getPICJumpTableRelocBase, but as an MCExpr.
static const MCConstantExpr * create(int64_t Value, MCContext &Ctx)
Definition: MCExpr.cpp:159
Type * getElementType() const
Definition: DerivedTypes.h:486
PointerType * getType() const
Global values are always pointers.
Definition: GlobalValue.h:260
.end_data_region
Definition: MCDirectives.h:61
bool isSpillSlotObjectIndex(int ObjectIdx) const
Returns true if the specified index corresponds to a spill slot.
bool supportIndirectSymViaGOTPCRel() const
Target supports replacing a data "PC"-relative access to a symbol through another symbol...
User * user_back()
Definition: Value.h:381
This class contains meta information specific to a module.
This file describes how to lower LLVM code to machine code.
Type * getTypeAtIndex(const Value *V) const
Given an index value into the type, return the type of the element.
Definition: Type.cpp:517
bool isString(unsigned CharSize=8) const
This method returns true if this is an array of CharSize integers.
Definition: Constants.cpp:2653
MCSubtargetInfo & getSubtargetCopy(const MCSubtargetInfo &STI)
Definition: MCContext.cpp:563