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"
36 #include "llvm/BinaryFormat/ELF.h"
61 #include "llvm/IR/BasicBlock.h"
62 #include "llvm/IR/Comdat.h"
63 #include "llvm/IR/Constant.h"
64 #include "llvm/IR/Constants.h"
65 #include "llvm/IR/DataLayout.h"
67 #include "llvm/IR/DerivedTypes.h"
68 #include "llvm/IR/Function.h"
69 #include "llvm/IR/GlobalAlias.h"
70 #include "llvm/IR/GlobalIFunc.h"
72 #include "llvm/IR/GlobalObject.h"
73 #include "llvm/IR/GlobalValue.h"
74 #include "llvm/IR/GlobalVariable.h"
75 #include "llvm/IR/Instruction.h"
76 #include "llvm/IR/Mangler.h"
77 #include "llvm/IR/Metadata.h"
78 #include "llvm/IR/Module.h"
79 #include "llvm/IR/Operator.h"
80 #include "llvm/IR/Type.h"
81 #include "llvm/IR/Value.h"
82 #include "llvm/MC/MCAsmInfo.h"
83 #include "llvm/MC/MCCodePadder.h"
84 #include "llvm/MC/MCContext.h"
85 #include "llvm/MC/MCDirectives.h"
86 #include "llvm/MC/MCDwarf.h"
87 #include "llvm/MC/MCExpr.h"
88 #include "llvm/MC/MCInst.h"
89 #include "llvm/MC/MCSection.h"
90 #include "llvm/MC/MCSectionELF.h"
91 #include "llvm/MC/MCSectionMachO.h"
92 #include "llvm/MC/MCStreamer.h"
94 #include "llvm/MC/MCSymbol.h"
95 #include "llvm/MC/MCSymbolELF.h"
97 #include "llvm/MC/MCValue.h"
98 #include "llvm/MC/SectionKind.h"
99 #include "llvm/Pass.h"
100 #include "llvm/Support/Casting.h"
102 #include "llvm/Support/Compiler.h"
104 #include "llvm/Support/Format.h"
105 #include "llvm/Support/MathExtras.h"
106 #include "llvm/Support/Path.h"
108 #include "llvm/Support/Timer.h"
112 #include <algorithm>
113 #include <cassert>
114 #include <cinttypes>
115 #include <cstdint>
116 #include <iterator>
117 #include <limits>
118 #include <memory>
119 #include <string>
120 #include <utility>
121 #include <vector>
122 
123 using namespace llvm;
124 
125 #define DEBUG_TYPE "asm-printer"
126 
127 static const char *const DWARFGroupName = "dwarf";
128 static const char *const DWARFGroupDescription = "DWARF Emission";
129 static const char *const DbgTimerName = "emit";
130 static const char *const DbgTimerDescription = "Debug Info Emission";
131 static const char *const EHTimerName = "write_exception";
132 static const char *const EHTimerDescription = "DWARF Exception Writer";
133 static const char *const CodeViewLineTablesGroupName = "linetables";
134 static const char *const CodeViewLineTablesGroupDescription =
135  "CodeView Line Tables";
136 
137 STATISTIC(EmittedInsts, "Number of machine instrs printed");
138 
139 static cl::opt<bool>
140  PrintSchedule("print-schedule", cl::Hidden, cl::init(false),
141  cl::desc("Print 'sched: [latency:throughput]' in .s output"));
142 
143 char AsmPrinter::ID = 0;
144 
146 
147 static gcp_map_type &getGCMap(void *&P) {
148  if (!P)
149  P = new gcp_map_type();
150  return *(gcp_map_type*)P;
151 }
152 
153 /// getGVAlignmentLog2 - Return the alignment to use for the specified global
154 /// value in log2 form. This rounds up to the preferred alignment if possible
155 /// and legal.
156 static unsigned getGVAlignmentLog2(const GlobalValue *GV, const DataLayout &DL,
157  unsigned InBits = 0) {
158  unsigned NumBits = 0;
159  if (const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV))
160  NumBits = DL.getPreferredAlignmentLog(GVar);
161 
162  // If InBits is specified, round it to it.
163  if (InBits > NumBits)
164  NumBits = InBits;
165 
166  // If the GV has a specified alignment, take it into account.
167  if (GV->getAlignment() == 0)
168  return NumBits;
169 
170  unsigned GVAlign = Log2_32(GV->getAlignment());
171 
172  // If the GVAlign is larger than NumBits, or if we are required to obey
173  // NumBits because the GV has an assigned section, obey it.
174  if (GVAlign > NumBits || GV->hasSection())
175  NumBits = GVAlign;
176  return NumBits;
177 }
178 
179 AsmPrinter::AsmPrinter(TargetMachine &tm, std::unique_ptr<MCStreamer> Streamer)
180  : MachineFunctionPass(ID), TM(tm), MAI(tm.getMCAsmInfo()),
181  OutContext(Streamer->getContext()), OutStreamer(std::move(Streamer)) {
182  VerboseAsm = OutStreamer->isVerboseAsm();
183 }
184 
186  assert(!DD && Handlers.empty() && "Debug/EH info didn't get finalized");
187 
188  if (GCMetadataPrinters) {
189  gcp_map_type &GCMap = getGCMap(GCMetadataPrinters);
190 
191  delete &GCMap;
192  GCMetadataPrinters = nullptr;
193  }
194 }
195 
197  return TM.isPositionIndependent();
198 }
199 
200 /// getFunctionNumber - Return a unique ID for the current function.
202  return MF->getFunctionNumber();
203 }
204 
206  return *TM.getObjFileLowering();
207 }
208 
210  return MMI->getModule()->getDataLayout();
211 }
212 
213 // Do not use the cached DataLayout because some client use it without a Module
214 // (llvm-dsymutil, llvm-dwarfdump).
215 unsigned AsmPrinter::getPointerSize() const { return TM.getPointerSize(); }
216 
218  assert(MF && "getSubtargetInfo requires a valid MachineFunction!");
219  return MF->getSubtarget<MCSubtargetInfo>();
220 }
221 
224 }
225 
226 /// getCurrentSection() - Return the current section we are emitting to.
228  return OutStreamer->getCurrentSectionOnly();
229 }
230 
232  AU.setPreservesAll();
238 }
239 
241  MMI = getAnalysisIfAvailable<MachineModuleInfo>();
242 
243  // Initialize TargetLoweringObjectFile.
245  .Initialize(OutContext, TM);
246 
247  OutStreamer->InitSections(false);
248 
249  // Emit the version-min deplyment target directive if needed.
250  //
251  // FIXME: If we end up with a collection of these sorts of Darwin-specific
252  // or ELF-specific things, it may make sense to have a platform helper class
253  // that will work with the target helper class. For now keep it here, as the
254  // alternative is duplicated code in each of the target asm printers that
255  // use the directive, where it would need the same conditionalization
256  // anyway.
257  const Triple &Target = TM.getTargetTriple();
258  OutStreamer->EmitVersionForTarget(Target);
259 
260  // Allow the target to emit any magic that it wants at the start of the file.
262 
263  // Very minimal debug info. It is ignored if we emit actual debug info. If we
264  // don't, this at least helps the user find where a global came from.
266  // .file "foo.c"
267  OutStreamer->EmitFileDirective(
269  }
270 
271  GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
272  assert(MI && "AsmPrinter didn't require GCModuleInfo?");
273  for (auto &I : *MI)
274  if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I))
275  MP->beginAssembly(M, *MI, *this);
276 
277  // Emit module-level inline asm if it exists.
278  if (!M.getModuleInlineAsm().empty()) {
279  // We're at the module level. Construct MCSubtarget from the default CPU
280  // and target triple.
281  std::unique_ptr<MCSubtargetInfo> STI(TM.getTarget().createMCSubtargetInfo(
284  OutStreamer->AddComment("Start of file scope inline assembly");
285  OutStreamer->AddBlankLine();
286  EmitInlineAsm(M.getModuleInlineAsm()+"\n",
288  OutStreamer->AddComment("End of file scope inline assembly");
289  OutStreamer->AddBlankLine();
290  }
291 
293  bool EmitCodeView = MMI->getModule()->getCodeViewFlag();
294  if (EmitCodeView && (TM.getTargetTriple().isKnownWindowsMSVCEnvironment() ||
296  Handlers.push_back(HandlerInfo(new CodeViewDebug(this),
297  DbgTimerName, DbgTimerDescription,
298  CodeViewLineTablesGroupName,
299  CodeViewLineTablesGroupDescription));
300  }
301  if (!EmitCodeView || MMI->getModule()->getDwarfVersion()) {
302  DD = new DwarfDebug(this, &M);
303  DD->beginModule();
304  Handlers.push_back(HandlerInfo(DD, DbgTimerName, DbgTimerDescription,
305  DWARFGroupName, DWARFGroupDescription));
306  }
307  }
308 
309  switch (MAI->getExceptionHandlingType()) {
313  isCFIMoveForDebugging = true;
315  break;
316  for (auto &F: M.getFunctionList()) {
317  // If the module contains any function with unwind data,
318  // .eh_frame has to be emitted.
319  // Ignore functions that won't get emitted.
320  if (!F.isDeclarationForLinker() && F.needsUnwindTableEntry()) {
321  isCFIMoveForDebugging = false;
322  break;
323  }
324  }
325  break;
326  default:
327  isCFIMoveForDebugging = false;
328  break;
329  }
330 
331  EHStreamer *ES = nullptr;
332  switch (MAI->getExceptionHandlingType()) {
334  break;
337  ES = new DwarfCFIException(this);
338  break;
340  ES = new ARMException(this);
341  break;
343  switch (MAI->getWinEHEncodingType()) {
344  default: llvm_unreachable("unsupported unwinding information encoding");
346  break;
349  ES = new WinException(this);
350  break;
351  }
352  break;
353  }
354  if (ES)
355  Handlers.push_back(HandlerInfo(ES, EHTimerName, EHTimerDescription,
356  DWARFGroupName, DWARFGroupDescription));
357  return false;
358 }
359 
360 static bool canBeHidden(const GlobalValue *GV, const MCAsmInfo &MAI) {
362  return false;
363 
364  return canBeOmittedFromSymbolTable(GV);
365 }
366 
367 void AsmPrinter::EmitLinkage(const GlobalValue *GV, MCSymbol *GVSym) const {
368  GlobalValue::LinkageTypes Linkage = GV->getLinkage();
369  switch (Linkage) {
375  if (MAI->hasWeakDefDirective()) {
376  // .globl _foo
377  OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Global);
378 
379  if (!canBeHidden(GV, *MAI))
380  // .weak_definition _foo
381  OutStreamer->EmitSymbolAttribute(GVSym, MCSA_WeakDefinition);
382  else
383  OutStreamer->EmitSymbolAttribute(GVSym, MCSA_WeakDefAutoPrivate);
384  } else if (MAI->hasLinkOnceDirective()) {
385  // .globl _foo
386  OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Global);
387  //NOTE: linkonce is handled by the section the symbol was assigned to.
388  } else {
389  // .weak _foo
390  OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Weak);
391  }
392  return;
394  // If external, declare as a global symbol: .globl _foo
395  OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Global);
396  return;
399  return;
403  llvm_unreachable("Should never emit this");
404  }
405  llvm_unreachable("Unknown linkage type!");
406 }
407 
409  const GlobalValue *GV) const {
410  TM.getNameWithPrefix(Name, GV, getObjFileLowering().getMangler());
411 }
412 
414  return TM.getSymbol(GV);
415 }
416 
417 /// EmitGlobalVariable - Emit the specified global variable to the .s file.
419  bool IsEmuTLSVar = TM.Options.EmulatedTLS && GV->isThreadLocal();
420  assert(!(IsEmuTLSVar && GV->hasCommonLinkage()) &&
421  "No emulated TLS variables in the common section");
422 
423  // Never emit TLS variable xyz in emulated TLS model.
424  // The initialization value is in __emutls_t.xyz instead of xyz.
425  if (IsEmuTLSVar)
426  return;
427 
428  if (GV->hasInitializer()) {
429  // Check to see if this is a special global used by LLVM, if so, emit it.
430  if (EmitSpecialLLVMGlobal(GV))
431  return;
432 
433  // Skip the emission of global equivalents. The symbol can be emitted later
434  // on by emitGlobalGOTEquivs in case it turns out to be needed.
435  if (GlobalGOTEquivs.count(getSymbol(GV)))
436  return;
437 
438  if (isVerbose()) {
439  // When printing the control variable __emutls_v.*,
440  // we don't need to print the original TLS variable name.
441  GV->printAsOperand(OutStreamer->GetCommentOS(),
442  /*PrintType=*/false, GV->getParent());
443  OutStreamer->GetCommentOS() << '\n';
444  }
445  }
446 
447  MCSymbol *GVSym = getSymbol(GV);
448  MCSymbol *EmittedSym = GVSym;
449 
450  // getOrCreateEmuTLSControlSym only creates the symbol with name and default
451  // attributes.
452  // GV's or GVSym's attributes will be used for the EmittedSym.
453  EmitVisibility(EmittedSym, GV->getVisibility(), !GV->isDeclaration());
454 
455  if (!GV->hasInitializer()) // External globals require no extra code.
456  return;
457 
458  GVSym->redefineIfPossible();
459  if (GVSym->isDefined() || GVSym->isVariable())
460  report_fatal_error("symbol '" + Twine(GVSym->getName()) +
461  "' is already defined");
462 
464  OutStreamer->EmitSymbolAttribute(EmittedSym, MCSA_ELF_TypeObject);
465 
467 
468  const DataLayout &DL = GV->getParent()->getDataLayout();
469  uint64_t Size = DL.getTypeAllocSize(GV->getType()->getElementType());
470 
471  // If the alignment is specified, we *must* obey it. Overaligning a global
472  // with a specified alignment is a prompt way to break globals emitted to
473  // sections and expected to be contiguous (e.g. ObjC metadata).
474  unsigned AlignLog = getGVAlignmentLog2(GV, DL);
475 
476  for (const HandlerInfo &HI : Handlers) {
477  NamedRegionTimer T(HI.TimerName, HI.TimerDescription,
478  HI.TimerGroupName, HI.TimerGroupDescription,
480  HI.Handler->setSymbolSize(GVSym, Size);
481  }
482 
483  // Handle common symbols
484  if (GVKind.isCommon()) {
485  if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
486  unsigned Align = 1 << AlignLog;
488  Align = 0;
489 
490  // .comm _foo, 42, 4
491  OutStreamer->EmitCommonSymbol(GVSym, Size, Align);
492  return;
493  }
494 
495  // Determine to which section this global should be emitted.
496  MCSection *TheSection = getObjFileLowering().SectionForGlobal(GV, GVKind, TM);
497 
498  // If we have a bss global going to a section that supports the
499  // zerofill directive, do so here.
500  if (GVKind.isBSS() && MAI->hasMachoZeroFillDirective() &&
501  TheSection->isVirtualSection()) {
502  if (Size == 0)
503  Size = 1; // zerofill of 0 bytes is undefined.
504  unsigned Align = 1 << AlignLog;
505  EmitLinkage(GV, GVSym);
506  // .zerofill __DATA, __bss, _foo, 400, 5
507  OutStreamer->EmitZerofill(TheSection, GVSym, Size, Align);
508  return;
509  }
510 
511  // If this is a BSS local symbol and we are emitting in the BSS
512  // section use .lcomm/.comm directive.
513  if (GVKind.isBSSLocal() &&
514  getObjFileLowering().getBSSSection() == TheSection) {
515  if (Size == 0)
516  Size = 1; // .comm Foo, 0 is undefined, avoid it.
517  unsigned Align = 1 << AlignLog;
518 
519  // Use .lcomm only if it supports user-specified alignment.
520  // Otherwise, while it would still be correct to use .lcomm in some
521  // cases (e.g. when Align == 1), the external assembler might enfore
522  // some -unknown- default alignment behavior, which could cause
523  // spurious differences between external and integrated assembler.
524  // Prefer to simply fall back to .local / .comm in this case.
526  // .lcomm _foo, 42
527  OutStreamer->EmitLocalCommonSymbol(GVSym, Size, Align);
528  return;
529  }
530 
531  if (!getObjFileLowering().getCommDirectiveSupportsAlignment())
532  Align = 0;
533 
534  // .local _foo
535  OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Local);
536  // .comm _foo, 42, 4
537  OutStreamer->EmitCommonSymbol(GVSym, Size, Align);
538  return;
539  }
540 
541  // Handle thread local data for mach-o which requires us to output an
542  // additional structure of data and mangle the original symbol so that we
543  // can reference it later.
544  //
545  // TODO: This should become an "emit thread local global" method on TLOF.
546  // All of this macho specific stuff should be sunk down into TLOFMachO and
547  // stuff like "TLSExtraDataSection" should no longer be part of the parent
548  // TLOF class. This will also make it more obvious that stuff like
549  // MCStreamer::EmitTBSSSymbol is macho specific and only called from macho
550  // specific code.
551  if (GVKind.isThreadLocal() && MAI->hasMachoTBSSDirective()) {
552  // Emit the .tbss symbol
553  MCSymbol *MangSym =
554  OutContext.getOrCreateSymbol(GVSym->getName() + Twine("$tlv$init"));
555 
556  if (GVKind.isThreadBSS()) {
557  TheSection = getObjFileLowering().getTLSBSSSection();
558  OutStreamer->EmitTBSSSymbol(TheSection, MangSym, Size, 1 << AlignLog);
559  } else if (GVKind.isThreadData()) {
560  OutStreamer->SwitchSection(TheSection);
561 
562  EmitAlignment(AlignLog, GV);
563  OutStreamer->EmitLabel(MangSym);
564 
566  GV->getInitializer());
567  }
568 
569  OutStreamer->AddBlankLine();
570 
571  // Emit the variable struct for the runtime.
573 
574  OutStreamer->SwitchSection(TLVSect);
575  // Emit the linkage here.
576  EmitLinkage(GV, GVSym);
577  OutStreamer->EmitLabel(GVSym);
578 
579  // Three pointers in size:
580  // - __tlv_bootstrap - used to make sure support exists
581  // - spare pointer, used when mapped by the runtime
582  // - pointer to mangled symbol above with initializer
583  unsigned PtrSize = DL.getPointerTypeSize(GV->getType());
584  OutStreamer->EmitSymbolValue(GetExternalSymbolSymbol("_tlv_bootstrap"),
585  PtrSize);
586  OutStreamer->EmitIntValue(0, PtrSize);
587  OutStreamer->EmitSymbolValue(MangSym, PtrSize);
588 
589  OutStreamer->AddBlankLine();
590  return;
591  }
592 
593  MCSymbol *EmittedInitSym = GVSym;
594 
595  OutStreamer->SwitchSection(TheSection);
596 
597  EmitLinkage(GV, EmittedInitSym);
598  EmitAlignment(AlignLog, GV);
599 
600  OutStreamer->EmitLabel(EmittedInitSym);
601 
603 
605  // .size foo, 42
606  OutStreamer->emitELFSize(EmittedInitSym,
608 
609  OutStreamer->AddBlankLine();
610 }
611 
612 /// Emit the directive and value for debug thread local expression
613 ///
614 /// \p Value - The value to emit.
615 /// \p Size - The size of the integer (in bytes) to emit.
617  unsigned Size) const {
618  OutStreamer->EmitValue(Value, Size);
619 }
620 
621 /// EmitFunctionHeader - This method emits the header for the current
622 /// function.
623 void AsmPrinter::EmitFunctionHeader() {
624  const Function &F = MF->getFunction();
625 
626  if (isVerbose())
627  OutStreamer->GetCommentOS()
628  << "-- Begin function "
630 
631  // Print out constants referenced by the function
633 
634  // Print the 'header' of function.
635  OutStreamer->SwitchSection(getObjFileLowering().SectionForGlobal(&F, TM));
636  EmitVisibility(CurrentFnSym, F.getVisibility());
637 
638  EmitLinkage(&F, CurrentFnSym);
639  if (MAI->hasFunctionAlignment())
641 
643  OutStreamer->EmitSymbolAttribute(CurrentFnSym, MCSA_ELF_TypeFunction);
644 
645  if (isVerbose()) {
646  F.printAsOperand(OutStreamer->GetCommentOS(),
647  /*PrintType=*/false, F.getParent());
648  OutStreamer->GetCommentOS() << '\n';
649  }
650 
651  // Emit the prefix data.
652  if (F.hasPrefixData()) {
653  if (MAI->hasSubsectionsViaSymbols()) {
654  // Preserving prefix data on platforms which use subsections-via-symbols
655  // is a bit tricky. Here we introduce a symbol for the prefix data
656  // and use the .alt_entry attribute to mark the function's real entry point
657  // as an alternative entry point to the prefix-data symbol.
659  OutStreamer->EmitLabel(PrefixSym);
660 
662 
663  // Emit an .alt_entry directive for the actual function symbol.
664  OutStreamer->EmitSymbolAttribute(CurrentFnSym, MCSA_AltEntry);
665  } else {
667  }
668  }
669 
670  // Emit the CurrentFnSym. This is a virtual function to allow targets to
671  // do their wild and crazy things as required.
673 
674  // If the function had address-taken blocks that got deleted, then we have
675  // references to the dangling symbols. Emit them at the start of the function
676  // so that we don't get references to undefined symbols.
677  std::vector<MCSymbol*> DeadBlockSyms;
678  MMI->takeDeletedSymbolsForFunction(&F, DeadBlockSyms);
679  for (unsigned i = 0, e = DeadBlockSyms.size(); i != e; ++i) {
680  OutStreamer->AddComment("Address taken block that was later removed");
681  OutStreamer->EmitLabel(DeadBlockSyms[i]);
682  }
683 
684  if (CurrentFnBegin) {
685  if (MAI->useAssignmentForEHBegin()) {
687  OutStreamer->EmitLabel(CurPos);
688  OutStreamer->EmitAssignment(CurrentFnBegin,
690  } else {
691  OutStreamer->EmitLabel(CurrentFnBegin);
692  }
693  }
694 
695  // Emit pre-function debug and/or EH information.
696  for (const HandlerInfo &HI : Handlers) {
697  NamedRegionTimer T(HI.TimerName, HI.TimerDescription, HI.TimerGroupName,
698  HI.TimerGroupDescription, TimePassesIsEnabled);
699  HI.Handler->beginFunction(MF);
700  }
701 
702  // Emit the prologue data.
703  if (F.hasPrologueData())
705 }
706 
707 /// EmitFunctionEntryLabel - Emit the label that is the entrypoint for the
708 /// function. This can be overridden by targets as required to do custom stuff.
711 
712  // The function label could have already been emitted if two symbols end up
713  // conflicting due to asm renaming. Detect this and emit an error.
714  if (CurrentFnSym->isVariable())
716  "' is a protected alias");
717  if (CurrentFnSym->isDefined())
719  "' label emitted multiple times to assembly file");
720 
721  return OutStreamer->EmitLabel(CurrentFnSym);
722 }
723 
724 /// emitComments - Pretty-print comments for instructions.
725 /// It returns true iff the sched comment was emitted.
726 /// Otherwise it returns false.
727 static bool emitComments(const MachineInstr &MI, raw_ostream &CommentOS,
728  AsmPrinter *AP) {
729  const MachineFunction *MF = MI.getMF();
730  const TargetInstrInfo *TII = MF->getSubtarget().getInstrInfo();
731 
732  // Check for spills and reloads
733  int FI;
734 
735  const MachineFrameInfo &MFI = MF->getFrameInfo();
736  bool Commented = false;
737 
738  // We assume a single instruction only has a spill or reload, not
739  // both.
740  const MachineMemOperand *MMO;
741  if (TII->isLoadFromStackSlotPostFE(MI, FI)) {
742  if (MFI.isSpillSlotObjectIndex(FI)) {
743  MMO = *MI.memoperands_begin();
744  CommentOS << MMO->getSize() << "-byte Reload";
745  Commented = true;
746  }
747  } else if (TII->hasLoadFromStackSlot(MI, MMO, FI)) {
748  if (MFI.isSpillSlotObjectIndex(FI)) {
749  CommentOS << MMO->getSize() << "-byte Folded Reload";
750  Commented = true;
751  }
752  } else if (TII->isStoreToStackSlotPostFE(MI, FI)) {
753  if (MFI.isSpillSlotObjectIndex(FI)) {
754  MMO = *MI.memoperands_begin();
755  CommentOS << MMO->getSize() << "-byte Spill";
756  Commented = true;
757  }
758  } else if (TII->hasStoreToStackSlot(MI, MMO, FI)) {
759  if (MFI.isSpillSlotObjectIndex(FI)) {
760  CommentOS << MMO->getSize() << "-byte Folded Spill";
761  Commented = true;
762  }
763  }
764 
765  // Check for spill-induced copies
767  Commented = true;
768  CommentOS << " Reload Reuse";
769  }
770 
771  if (Commented) {
772  if (AP->EnablePrintSchedInfo) {
773  // If any comment was added above and we need sched info comment then add
774  // this new comment just after the above comment w/o "\n" between them.
775  CommentOS << " " << MF->getSubtarget().getSchedInfoStr(MI) << "\n";
776  return true;
777  }
778  CommentOS << "\n";
779  }
780  return false;
781 }
782 
783 /// emitImplicitDef - This method emits the specified machine instruction
784 /// that is an implicit def.
786  unsigned RegNo = MI->getOperand(0).getReg();
787 
788  SmallString<128> Str;
789  raw_svector_ostream OS(Str);
790  OS << "implicit-def: "
791  << printReg(RegNo, MF->getSubtarget().getRegisterInfo());
792 
793  OutStreamer->AddComment(OS.str());
794  OutStreamer->AddBlankLine();
795 }
796 
797 static void emitKill(const MachineInstr *MI, AsmPrinter &AP) {
798  std::string Str;
799  raw_string_ostream OS(Str);
800  OS << "kill:";
801  for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
802  const MachineOperand &Op = MI->getOperand(i);
803  assert(Op.isReg() && "KILL instruction must have only register operands");
804  OS << ' ' << (Op.isDef() ? "def " : "killed ")
805  << printReg(Op.getReg(), AP.MF->getSubtarget().getRegisterInfo());
806  }
807  AP.OutStreamer->AddComment(OS.str());
808  AP.OutStreamer->AddBlankLine();
809 }
810 
811 /// emitDebugValueComment - This method handles the target-independent form
812 /// of DBG_VALUE, returning true if it was able to do so. A false return
813 /// means the target will need to handle MI in EmitInstruction.
815  // This code handles only the 4-operand target-independent form.
816  if (MI->getNumOperands() != 4)
817  return false;
818 
819  SmallString<128> Str;
820  raw_svector_ostream OS(Str);
821  OS << "DEBUG_VALUE: ";
822 
823  const DILocalVariable *V = MI->getDebugVariable();
824  if (auto *SP = dyn_cast<DISubprogram>(V->getScope())) {
825  StringRef Name = SP->getName();
826  if (!Name.empty())
827  OS << Name << ":";
828  }
829  OS << V->getName();
830  OS << " <- ";
831 
832  // The second operand is only an offset if it's an immediate.
833  bool MemLoc = MI->getOperand(0).isReg() && MI->getOperand(1).isImm();
834  int64_t Offset = MemLoc ? MI->getOperand(1).getImm() : 0;
835  const DIExpression *Expr = MI->getDebugExpression();
836  if (Expr->getNumElements()) {
837  OS << '[';
838  bool NeedSep = false;
839  for (auto Op : Expr->expr_ops()) {
840  if (NeedSep)
841  OS << ", ";
842  else
843  NeedSep = true;
844  OS << dwarf::OperationEncodingString(Op.getOp());
845  for (unsigned I = 0; I < Op.getNumArgs(); ++I)
846  OS << ' ' << Op.getArg(I);
847  }
848  OS << "] ";
849  }
850 
851  // Register or immediate value. Register 0 means undef.
852  if (MI->getOperand(0).isFPImm()) {
853  APFloat APF = APFloat(MI->getOperand(0).getFPImm()->getValueAPF());
854  if (MI->getOperand(0).getFPImm()->getType()->isFloatTy()) {
855  OS << (double)APF.convertToFloat();
856  } else if (MI->getOperand(0).getFPImm()->getType()->isDoubleTy()) {
857  OS << APF.convertToDouble();
858  } else {
859  // There is no good way to print long double. Convert a copy to
860  // double. Ah well, it's only a comment.
861  bool ignored;
863  &ignored);
864  OS << "(long double) " << APF.convertToDouble();
865  }
866  } else if (MI->getOperand(0).isImm()) {
867  OS << MI->getOperand(0).getImm();
868  } else if (MI->getOperand(0).isCImm()) {
869  MI->getOperand(0).getCImm()->getValue().print(OS, false /*isSigned*/);
870  } else {
871  unsigned Reg;
872  if (MI->getOperand(0).isReg()) {
873  Reg = MI->getOperand(0).getReg();
874  } else {
875  assert(MI->getOperand(0).isFI() && "Unknown operand type");
877  Offset += TFI->getFrameIndexReference(*AP.MF,
878  MI->getOperand(0).getIndex(), Reg);
879  MemLoc = true;
880  }
881  if (Reg == 0) {
882  // Suppress offset, it is not meaningful here.
883  OS << "undef";
884  // NOTE: Want this comment at start of line, don't emit with AddComment.
885  AP.OutStreamer->emitRawComment(OS.str());
886  return true;
887  }
888  if (MemLoc)
889  OS << '[';
890  OS << printReg(Reg, AP.MF->getSubtarget().getRegisterInfo());
891  }
892 
893  if (MemLoc)
894  OS << '+' << Offset << ']';
895 
896  // NOTE: Want this comment at start of line, don't emit with AddComment.
897  AP.OutStreamer->emitRawComment(OS.str());
898  return true;
899 }
900 
904  return CFI_M_EH;
905 
906  if (MMI->hasDebugInfo())
907  return CFI_M_Debug;
908 
909  return CFI_M_None;
910 }
911 
914 }
915 
917  ExceptionHandling ExceptionHandlingType = MAI->getExceptionHandlingType();
918  if (ExceptionHandlingType != ExceptionHandling::DwarfCFI &&
919  ExceptionHandlingType != ExceptionHandling::ARM)
920  return;
921 
922  if (needsCFIMoves() == CFI_M_None)
923  return;
924 
925  // If there is no "real" instruction following this CFI instruction, skip
926  // emitting it; it would be beyond the end of the function's FDE range.
927  auto *MBB = MI.getParent();
928  auto I = std::next(MI.getIterator());
929  while (I != MBB->end() && I->isTransient())
930  ++I;
931  if (I == MBB->instr_end() &&
932  MBB->getReverseIterator() == MBB->getParent()->rbegin())
933  return;
934 
935  const std::vector<MCCFIInstruction> &Instrs = MF->getFrameInstructions();
936  unsigned CFIIndex = MI.getOperand(0).getCFIIndex();
937  const MCCFIInstruction &CFI = Instrs[CFIIndex];
938  emitCFIInstruction(CFI);
939 }
940 
942  // The operands are the MCSymbol and the frame offset of the allocation.
943  MCSymbol *FrameAllocSym = MI.getOperand(0).getMCSymbol();
944  int FrameOffset = MI.getOperand(1).getImm();
945 
946  // Emit a symbol assignment.
947  OutStreamer->EmitAssignment(FrameAllocSym,
948  MCConstantExpr::create(FrameOffset, OutContext));
949 }
950 
953  return;
954 
955  MCSection *StackSizeSection = getObjFileLowering().getStackSizesSection();
956  if (!StackSizeSection)
957  return;
958 
959  const MachineFrameInfo &FrameInfo = MF.getFrameInfo();
960  // Don't emit functions with dynamic stack allocations.
961  if (FrameInfo.hasVarSizedObjects())
962  return;
963 
964  OutStreamer->PushSection();
965  OutStreamer->SwitchSection(StackSizeSection);
966 
967  const MCSymbol *FunctionSymbol = getSymbol(&MF.getFunction());
968  uint64_t StackSize = FrameInfo.getStackSize();
969  OutStreamer->EmitValue(MCSymbolRefExpr::create(FunctionSymbol, OutContext),
970  /* size = */ 8);
971  OutStreamer->EmitULEB128IntValue(StackSize);
972 
973  OutStreamer->PopSection();
974 }
975 
978  if (!MF.getLandingPads().empty() || MF.hasEHFunclets() || MMI->hasDebugInfo())
979  return true;
980 
981  // We might emit an EH table that uses function begin and end labels even if
982  // we don't have any landingpads.
983  if (!MF.getFunction().hasPersonalityFn())
984  return false;
985  return !isNoOpWithoutInvoke(
987 }
988 
989 /// EmitFunctionBody - This method emits the body and trailer for a
990 /// function.
992  EmitFunctionHeader();
993 
994  // Emit target-specific gunk before the function body.
996 
997  bool ShouldPrintDebugScopes = MMI->hasDebugInfo();
998 
999  // Print out code for the function.
1000  bool HasAnyRealCode = false;
1001  int NumInstsInFunction = 0;
1002  for (auto &MBB : *MF) {
1003  // Print a label for the basic block.
1004  EmitBasicBlockStart(MBB);
1005  for (auto &MI : MBB) {
1006  // Print the assembly for the instruction.
1007  if (!MI.isPosition() && !MI.isImplicitDef() && !MI.isKill() &&
1008  !MI.isDebugValue()) {
1009  HasAnyRealCode = true;
1010  ++NumInstsInFunction;
1011  }
1012 
1013  if (ShouldPrintDebugScopes) {
1014  for (const HandlerInfo &HI : Handlers) {
1015  NamedRegionTimer T(HI.TimerName, HI.TimerDescription,
1016  HI.TimerGroupName, HI.TimerGroupDescription,
1018  HI.Handler->beginInstruction(&MI);
1019  }
1020  }
1021 
1022  if (isVerbose() && emitComments(MI, OutStreamer->GetCommentOS(), this)) {
1023  MachineInstr *MIP = const_cast<MachineInstr *>(&MI);
1025  }
1026 
1027  switch (MI.getOpcode()) {
1028  case TargetOpcode::CFI_INSTRUCTION:
1030  break;
1031  case TargetOpcode::LOCAL_ESCAPE:
1032  emitFrameAlloc(MI);
1033  break;
1035  case TargetOpcode::GC_LABEL:
1036  OutStreamer->EmitLabel(MI.getOperand(0).getMCSymbol());
1037  break;
1039  EmitInlineAsm(&MI);
1040  break;
1041  case TargetOpcode::DBG_VALUE:
1042  if (isVerbose()) {
1043  if (!emitDebugValueComment(&MI, *this))
1044  EmitInstruction(&MI);
1045  }
1046  break;
1047  case TargetOpcode::IMPLICIT_DEF:
1048  if (isVerbose()) emitImplicitDef(&MI);
1049  break;
1050  case TargetOpcode::KILL:
1051  if (isVerbose()) emitKill(&MI, *this);
1052  break;
1053  default:
1054  EmitInstruction(&MI);
1055  break;
1056  }
1057 
1058  if (ShouldPrintDebugScopes) {
1059  for (const HandlerInfo &HI : Handlers) {
1060  NamedRegionTimer T(HI.TimerName, HI.TimerDescription,
1061  HI.TimerGroupName, HI.TimerGroupDescription,
1063  HI.Handler->endInstruction();
1064  }
1065  }
1066  }
1067 
1068  EmitBasicBlockEnd(MBB);
1069  }
1070 
1071  EmittedInsts += NumInstsInFunction;
1072  MachineOptimizationRemarkAnalysis R(DEBUG_TYPE, "InstructionCount",
1073  MF->getFunction().getSubprogram(),
1074  &MF->front());
1075  R << ore::NV("NumInstructions", NumInstsInFunction)
1076  << " instructions in function";
1077  ORE->emit(R);
1078 
1079  // If the function is empty and the object file uses .subsections_via_symbols,
1080  // then we need to emit *something* to the function body to prevent the
1081  // labels from collapsing together. Just emit a noop.
1082  // Similarly, don't emit empty functions on Windows either. It can lead to
1083  // duplicate entries (two functions with the same RVA) in the Guard CF Table
1084  // after linking, causing the kernel not to load the binary:
1085  // https://developercommunity.visualstudio.com/content/problem/45366/vc-linker-creates-invalid-dll-with-clang-cl.html
1086  // FIXME: Hide this behind some API in e.g. MCAsmInfo or MCTargetStreamer.
1087  const Triple &TT = TM.getTargetTriple();
1088  if (!HasAnyRealCode && (MAI->hasSubsectionsViaSymbols() ||
1089  (TT.isOSWindows() && TT.isOSBinFormatCOFF()))) {
1090  MCInst Noop;
1091  MF->getSubtarget().getInstrInfo()->getNoop(Noop);
1092 
1093  // Targets can opt-out of emitting the noop here by leaving the opcode
1094  // unspecified.
1095  if (Noop.getOpcode()) {
1096  OutStreamer->AddComment("avoids zero-length function");
1097  OutStreamer->EmitInstruction(Noop, getSubtargetInfo());
1098  }
1099  }
1100 
1101  const Function &F = MF->getFunction();
1102  for (const auto &BB : F) {
1103  if (!BB.hasAddressTaken())
1104  continue;
1105  MCSymbol *Sym = GetBlockAddressSymbol(&BB);
1106  if (Sym->isDefined())
1107  continue;
1108  OutStreamer->AddComment("Address of block that was removed by CodeGen");
1109  OutStreamer->EmitLabel(Sym);
1110  }
1111 
1112  // Emit target-specific gunk after the function body.
1114 
1115  if (needFuncLabelsForEHOrDebugInfo(*MF, MMI) ||
1117  // Create a symbol for the end of function.
1118  CurrentFnEnd = createTempSymbol("func_end");
1119  OutStreamer->EmitLabel(CurrentFnEnd);
1120  }
1121 
1122  // If the target wants a .size directive for the size of the function, emit
1123  // it.
1125  // We can get the size as difference between the function label and the
1126  // temp label.
1127  const MCExpr *SizeExp = MCBinaryExpr::createSub(
1128  MCSymbolRefExpr::create(CurrentFnEnd, OutContext),
1130  OutStreamer->emitELFSize(CurrentFnSym, SizeExp);
1131  }
1132 
1133  for (const HandlerInfo &HI : Handlers) {
1134  NamedRegionTimer T(HI.TimerName, HI.TimerDescription, HI.TimerGroupName,
1135  HI.TimerGroupDescription, TimePassesIsEnabled);
1136  HI.Handler->markFunctionEnd();
1137  }
1138 
1139  // Print out jump tables referenced by the function.
1141 
1142  // Emit post-function debug and/or EH information.
1143  for (const HandlerInfo &HI : Handlers) {
1144  NamedRegionTimer T(HI.TimerName, HI.TimerDescription, HI.TimerGroupName,
1145  HI.TimerGroupDescription, TimePassesIsEnabled);
1146  HI.Handler->endFunction(MF);
1147  }
1148 
1149  // Emit section containing stack size metadata.
1150  emitStackSizeSection(*MF);
1151 
1152  if (isVerbose())
1153  OutStreamer->GetCommentOS() << "-- End function\n";
1154 
1155  OutStreamer->AddBlankLine();
1156 }
1157 
1158 /// \brief Compute the number of Global Variables that uses a Constant.
1159 static unsigned getNumGlobalVariableUses(const Constant *C) {
1160  if (!C)
1161  return 0;
1162 
1163  if (isa<GlobalVariable>(C))
1164  return 1;
1165 
1166  unsigned NumUses = 0;
1167  for (auto *CU : C->users())
1168  NumUses += getNumGlobalVariableUses(dyn_cast<Constant>(CU));
1169 
1170  return NumUses;
1171 }
1172 
1173 /// \brief Only consider global GOT equivalents if at least one user is a
1174 /// cstexpr inside an initializer of another global variables. Also, don't
1175 /// handle cstexpr inside instructions. During global variable emission,
1176 /// candidates are skipped and are emitted later in case at least one cstexpr
1177 /// isn't replaced by a PC relative GOT entry access.
1179  unsigned &NumGOTEquivUsers) {
1180  // Global GOT equivalents are unnamed private globals with a constant
1181  // pointer initializer to another global symbol. They must point to a
1182  // GlobalVariable or Function, i.e., as GlobalValue.
1183  if (!GV->hasGlobalUnnamedAddr() || !GV->hasInitializer() ||
1184  !GV->isConstant() || !GV->isDiscardableIfUnused() ||
1185  !dyn_cast<GlobalValue>(GV->getOperand(0)))
1186  return false;
1187 
1188  // To be a got equivalent, at least one of its users need to be a constant
1189  // expression used by another global variable.
1190  for (auto *U : GV->users())
1191  NumGOTEquivUsers += getNumGlobalVariableUses(dyn_cast<Constant>(U));
1192 
1193  return NumGOTEquivUsers > 0;
1194 }
1195 
1196 /// \brief Unnamed constant global variables solely contaning a pointer to
1197 /// another globals variable is equivalent to a GOT table entry; it contains the
1198 /// the address of another symbol. Optimize it and replace accesses to these
1199 /// "GOT equivalents" by using the GOT entry for the final global instead.
1200 /// Compute GOT equivalent candidates among all global variables to avoid
1201 /// emitting them if possible later on, after it use is replaced by a GOT entry
1202 /// access.
1204  if (!getObjFileLowering().supportIndirectSymViaGOTPCRel())
1205  return;
1206 
1207  for (const auto &G : M.globals()) {
1208  unsigned NumGOTEquivUsers = 0;
1209  if (!isGOTEquivalentCandidate(&G, NumGOTEquivUsers))
1210  continue;
1211 
1212  const MCSymbol *GOTEquivSym = getSymbol(&G);
1213  GlobalGOTEquivs[GOTEquivSym] = std::make_pair(&G, NumGOTEquivUsers);
1214  }
1215 }
1216 
1217 /// \brief Constant expressions using GOT equivalent globals may not be eligible
1218 /// for PC relative GOT entry conversion, in such cases we need to emit such
1219 /// globals we previously omitted in EmitGlobalVariable.
1221  if (!getObjFileLowering().supportIndirectSymViaGOTPCRel())
1222  return;
1223 
1224  SmallVector<const GlobalVariable *, 8> FailedCandidates;
1225  for (auto &I : GlobalGOTEquivs) {
1226  const GlobalVariable *GV = I.second.first;
1227  unsigned Cnt = I.second.second;
1228  if (Cnt)
1229  FailedCandidates.push_back(GV);
1230  }
1231  GlobalGOTEquivs.clear();
1232 
1233  for (auto *GV : FailedCandidates)
1234  EmitGlobalVariable(GV);
1235 }
1236 
1237 void AsmPrinter::emitGlobalIndirectSymbol(Module &M,
1238  const GlobalIndirectSymbol& GIS) {
1239  MCSymbol *Name = getSymbol(&GIS);
1240 
1241  if (GIS.hasExternalLinkage() || !MAI->getWeakRefDirective())
1242  OutStreamer->EmitSymbolAttribute(Name, MCSA_Global);
1243  else if (GIS.hasWeakLinkage() || GIS.hasLinkOnceLinkage())
1244  OutStreamer->EmitSymbolAttribute(Name, MCSA_WeakReference);
1245  else
1246  assert(GIS.hasLocalLinkage() && "Invalid alias or ifunc linkage");
1247 
1248  // Set the symbol type to function if the alias has a function type.
1249  // This affects codegen when the aliasee is not a function.
1250  if (GIS.getType()->getPointerElementType()->isFunctionTy()) {
1251  OutStreamer->EmitSymbolAttribute(Name, MCSA_ELF_TypeFunction);
1252  if (isa<GlobalIFunc>(GIS))
1253  OutStreamer->EmitSymbolAttribute(Name, MCSA_ELF_TypeIndFunction);
1254  }
1255 
1256  EmitVisibility(Name, GIS.getVisibility());
1257 
1258  const MCExpr *Expr = lowerConstant(GIS.getIndirectSymbol());
1259 
1260  if (isa<GlobalAlias>(&GIS) && MAI->hasAltEntry() && isa<MCBinaryExpr>(Expr))
1261  OutStreamer->EmitSymbolAttribute(Name, MCSA_AltEntry);
1262 
1263  // Emit the directives as assignments aka .set:
1264  OutStreamer->EmitAssignment(Name, Expr);
1265 
1266  if (auto *GA = dyn_cast<GlobalAlias>(&GIS)) {
1267  // If the aliasee does not correspond to a symbol in the output, i.e. the
1268  // alias is not of an object or the aliased object is private, then set the
1269  // size of the alias symbol from the type of the alias. We don't do this in
1270  // other situations as the alias and aliasee having differing types but same
1271  // size may be intentional.
1272  const GlobalObject *BaseObject = GA->getBaseObject();
1273  if (MAI->hasDotTypeDotSizeDirective() && GA->getValueType()->isSized() &&
1274  (!BaseObject || BaseObject->hasPrivateLinkage())) {
1275  const DataLayout &DL = M.getDataLayout();
1276  uint64_t Size = DL.getTypeAllocSize(GA->getValueType());
1277  OutStreamer->emitELFSize(Name, MCConstantExpr::create(Size, OutContext));
1278  }
1279  }
1280 }
1281 
1283  // Set the MachineFunction to nullptr so that we can catch attempted
1284  // accesses to MF specific features at the module level and so that
1285  // we can conditionalize accesses based on whether or not it is nullptr.
1286  MF = nullptr;
1287 
1288  // Gather all GOT equivalent globals in the module. We really need two
1289  // passes over the globals: one to compute and another to avoid its emission
1290  // in EmitGlobalVariable, otherwise we would not be able to handle cases
1291  // where the got equivalent shows up before its use.
1293 
1294  // Emit global variables.
1295  for (const auto &G : M.globals())
1297 
1298  // Emit remaining GOT equivalent globals.
1300 
1301  // Emit visibility info for declarations
1302  for (const Function &F : M) {
1303  if (!F.isDeclarationForLinker())
1304  continue;
1305  GlobalValue::VisibilityTypes V = F.getVisibility();
1307  continue;
1308 
1309  MCSymbol *Name = getSymbol(&F);
1310  EmitVisibility(Name, V, false);
1311  }
1312 
1314 
1315  TLOF.emitModuleMetadata(*OutStreamer, M, TM);
1316 
1319 
1320  // Output stubs for external and common global variables.
1322  if (!Stubs.empty()) {
1323  OutStreamer->SwitchSection(TLOF.getDataSection());
1324  const DataLayout &DL = M.getDataLayout();
1325 
1326  for (const auto &Stub : Stubs) {
1327  OutStreamer->EmitLabel(Stub.first);
1328  OutStreamer->EmitSymbolValue(Stub.second.getPointer(),
1329  DL.getPointerSize());
1330  }
1331  }
1332  }
1333 
1334  // Finalize debug and EH information.
1335  for (const HandlerInfo &HI : Handlers) {
1336  NamedRegionTimer T(HI.TimerName, HI.TimerDescription, HI.TimerGroupName,
1337  HI.TimerGroupDescription, TimePassesIsEnabled);
1338  HI.Handler->endModule();
1339  delete HI.Handler;
1340  }
1341  Handlers.clear();
1342  DD = nullptr;
1343 
1344  // If the target wants to know about weak references, print them all.
1345  if (MAI->getWeakRefDirective()) {
1346  // FIXME: This is not lazy, it would be nice to only print weak references
1347  // to stuff that is actually used. Note that doing so would require targets
1348  // to notice uses in operands (due to constant exprs etc). This should
1349  // happen with the MC stuff eventually.
1350 
1351  // Print out module-level global objects here.
1352  for (const auto &GO : M.global_objects()) {
1353  if (!GO.hasExternalWeakLinkage())
1354  continue;
1355  OutStreamer->EmitSymbolAttribute(getSymbol(&GO), MCSA_WeakReference);
1356  }
1357  }
1358 
1359  OutStreamer->AddBlankLine();
1360 
1361  // Print aliases in topological order, that is, for each alias a = b,
1362  // b must be printed before a.
1363  // This is because on some targets (e.g. PowerPC) linker expects aliases in
1364  // such an order to generate correct TOC information.
1367  for (const auto &Alias : M.aliases()) {
1368  for (const GlobalAlias *Cur = &Alias; Cur;
1369  Cur = dyn_cast<GlobalAlias>(Cur->getAliasee())) {
1370  if (!AliasVisited.insert(Cur).second)
1371  break;
1372  AliasStack.push_back(Cur);
1373  }
1374  for (const GlobalAlias *AncestorAlias : llvm::reverse(AliasStack))
1375  emitGlobalIndirectSymbol(M, *AncestorAlias);
1376  AliasStack.clear();
1377  }
1378  for (const auto &IFunc : M.ifuncs())
1379  emitGlobalIndirectSymbol(M, IFunc);
1380 
1381  GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
1382  assert(MI && "AsmPrinter didn't require GCModuleInfo?");
1383  for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; )
1384  if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(**--I))
1385  MP->finishAssembly(M, *MI, *this);
1386 
1387  // Emit llvm.ident metadata in an '.ident' directive.
1388  EmitModuleIdents(M);
1389 
1390  // Emit __morestack address if needed for indirect calls.
1391  if (MMI->usesMorestackAddr()) {
1392  unsigned Align = 1;
1393  MCSection *ReadOnlySection = getObjFileLowering().getSectionForConstant(
1395  /*C=*/nullptr, Align);
1396  OutStreamer->SwitchSection(ReadOnlySection);
1397 
1398  MCSymbol *AddrSymbol =
1399  OutContext.getOrCreateSymbol(StringRef("__morestack_addr"));
1400  OutStreamer->EmitLabel(AddrSymbol);
1401 
1402  unsigned PtrSize = MAI->getCodePointerSize();
1403  OutStreamer->EmitSymbolValue(GetExternalSymbolSymbol("__morestack"),
1404  PtrSize);
1405  }
1406 
1407  // Emit .note.GNU-split-stack and .note.GNU-no-split-stack sections if
1408  // split-stack is used.
1410  OutStreamer->SwitchSection(
1411  OutContext.getELFSection(".note.GNU-split-stack", ELF::SHT_PROGBITS, 0));
1412  if (MMI->hasNosplitStack())
1413  OutStreamer->SwitchSection(
1414  OutContext.getELFSection(".note.GNU-no-split-stack", ELF::SHT_PROGBITS, 0));
1415  }
1416 
1417  // If we don't have any trampolines, then we don't require stack memory
1418  // to be executable. Some targets have a directive to declare this.
1419  Function *InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline");
1420  if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty())
1422  OutStreamer->SwitchSection(S);
1423 
1424  // Allow the target to emit any magic that it wants at the end of the file,
1425  // after everything else has gone out.
1426  EmitEndOfAsmFile(M);
1427 
1428  MMI = nullptr;
1429 
1430  OutStreamer->Finish();
1431  OutStreamer->reset();
1432 
1433  return false;
1434 }
1435 
1437  if (!CurExceptionSym)
1438  CurExceptionSym = createTempSymbol("exception");
1439  return CurExceptionSym;
1440 }
1441 
1443  this->MF = &MF;
1444  // Get the function symbol.
1447  CurrentFnBegin = nullptr;
1448  CurExceptionSym = nullptr;
1449  bool NeedsLocalForSize = MAI->needsLocalForSize();
1450  if (needFuncLabelsForEHOrDebugInfo(MF, MMI) || NeedsLocalForSize) {
1451  CurrentFnBegin = createTempSymbol("func_begin");
1452  if (NeedsLocalForSize)
1453  CurrentFnSymForSize = CurrentFnBegin;
1454  }
1455 
1456  ORE = &getAnalysis<MachineOptimizationRemarkEmitterPass>().getORE();
1457  LI = &getAnalysis<MachineLoopInfo>();
1458 
1459  const TargetSubtargetInfo &STI = MF.getSubtarget();
1460  EnablePrintSchedInfo = PrintSchedule.getNumOccurrences()
1461  ? PrintSchedule
1462  : STI.supportPrintSchedInfo();
1463 }
1464 
1465 namespace {
1466 
1467 // Keep track the alignment, constpool entries per Section.
1468  struct SectionCPs {
1469  MCSection *S;
1470  unsigned Alignment;
1472 
1473  SectionCPs(MCSection *s, unsigned a) : S(s), Alignment(a) {}
1474  };
1475 
1476 } // end anonymous namespace
1477 
1478 /// EmitConstantPool - Print to the current output stream assembly
1479 /// representations of the constants in the constant pool MCP. This is
1480 /// used to print out constants which have been "spilled to memory" by
1481 /// the code generator.
1483  const MachineConstantPool *MCP = MF->getConstantPool();
1484  const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
1485  if (CP.empty()) return;
1486 
1487  // Calculate sections for constant pool entries. We collect entries to go into
1488  // the same section together to reduce amount of section switch statements.
1489  SmallVector<SectionCPs, 4> CPSections;
1490  for (unsigned i = 0, e = CP.size(); i != e; ++i) {
1491  const MachineConstantPoolEntry &CPE = CP[i];
1492  unsigned Align = CPE.getAlignment();
1493 
1494  SectionKind Kind = CPE.getSectionKind(&getDataLayout());
1495 
1496  const Constant *C = nullptr;
1497  if (!CPE.isMachineConstantPoolEntry())
1498  C = CPE.Val.ConstVal;
1499 
1501  Kind, C, Align);
1502 
1503  // The number of sections are small, just do a linear search from the
1504  // last section to the first.
1505  bool Found = false;
1506  unsigned SecIdx = CPSections.size();
1507  while (SecIdx != 0) {
1508  if (CPSections[--SecIdx].S == S) {
1509  Found = true;
1510  break;
1511  }
1512  }
1513  if (!Found) {
1514  SecIdx = CPSections.size();
1515  CPSections.push_back(SectionCPs(S, Align));
1516  }
1517 
1518  if (Align > CPSections[SecIdx].Alignment)
1519  CPSections[SecIdx].Alignment = Align;
1520  CPSections[SecIdx].CPEs.push_back(i);
1521  }
1522 
1523  // Now print stuff into the calculated sections.
1524  const MCSection *CurSection = nullptr;
1525  unsigned Offset = 0;
1526  for (unsigned i = 0, e = CPSections.size(); i != e; ++i) {
1527  for (unsigned j = 0, ee = CPSections[i].CPEs.size(); j != ee; ++j) {
1528  unsigned CPI = CPSections[i].CPEs[j];
1529  MCSymbol *Sym = GetCPISymbol(CPI);
1530  if (!Sym->isUndefined())
1531  continue;
1532 
1533  if (CurSection != CPSections[i].S) {
1534  OutStreamer->SwitchSection(CPSections[i].S);
1535  EmitAlignment(Log2_32(CPSections[i].Alignment));
1536  CurSection = CPSections[i].S;
1537  Offset = 0;
1538  }
1539 
1540  MachineConstantPoolEntry CPE = CP[CPI];
1541 
1542  // Emit inter-object padding for alignment.
1543  unsigned AlignMask = CPE.getAlignment() - 1;
1544  unsigned NewOffset = (Offset + AlignMask) & ~AlignMask;
1545  OutStreamer->EmitZeros(NewOffset - Offset);
1546 
1547  Type *Ty = CPE.getType();
1548  Offset = NewOffset + getDataLayout().getTypeAllocSize(Ty);
1549 
1550  OutStreamer->EmitLabel(Sym);
1551  if (CPE.isMachineConstantPoolEntry())
1553  else
1555  }
1556  }
1557 }
1558 
1559 /// EmitJumpTableInfo - Print assembly representations of the jump tables used
1560 /// by the current function to the current output stream.
1562  const DataLayout &DL = MF->getDataLayout();
1563  const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo();
1564  if (!MJTI) return;
1565  if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_Inline) return;
1566  const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
1567  if (JT.empty()) return;
1568 
1569  // Pick the directive to use to print the jump table entries, and switch to
1570  // the appropriate section.
1571  const Function &F = MF->getFunction();
1573  bool JTInDiffSection = !TLOF.shouldPutJumpTableInFunctionSection(
1575  F);
1576  if (JTInDiffSection) {
1577  // Drop it in the readonly section.
1578  MCSection *ReadOnlySection = TLOF.getSectionForJumpTable(F, TM);
1579  OutStreamer->SwitchSection(ReadOnlySection);
1580  }
1581 
1583 
1584  // Jump tables in code sections are marked with a data_region directive
1585  // where that's supported.
1586  if (!JTInDiffSection)
1587  OutStreamer->EmitDataRegion(MCDR_DataRegionJT32);
1588 
1589  for (unsigned JTI = 0, e = JT.size(); JTI != e; ++JTI) {
1590  const std::vector<MachineBasicBlock*> &JTBBs = JT[JTI].MBBs;
1591 
1592  // If this jump table was deleted, ignore it.
1593  if (JTBBs.empty()) continue;
1594 
1595  // For the EK_LabelDifference32 entry, if using .set avoids a relocation,
1596  /// emit a .set directive for each unique entry.
1600  const TargetLowering *TLI = MF->getSubtarget().getTargetLowering();
1602  for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
1603  const MachineBasicBlock *MBB = JTBBs[ii];
1604  if (!EmittedSets.insert(MBB).second)
1605  continue;
1606 
1607  // .set LJTSet, LBB32-base
1608  const MCExpr *LHS =
1610  OutStreamer->EmitAssignment(GetJTSetSymbol(JTI, MBB->getNumber()),
1611  MCBinaryExpr::createSub(LHS, Base,
1612  OutContext));
1613  }
1614  }
1615 
1616  // On some targets (e.g. Darwin) we want to emit two consecutive labels
1617  // before each jump table. The first label is never referenced, but tells
1618  // the assembler and linker the extents of the jump table object. The
1619  // second label is actually referenced by the code.
1620  if (JTInDiffSection && DL.hasLinkerPrivateGlobalPrefix())
1621  // FIXME: This doesn't have to have any specific name, just any randomly
1622  // named and numbered 'l' label would work. Simplify GetJTISymbol.
1623  OutStreamer->EmitLabel(GetJTISymbol(JTI, true));
1624 
1625  OutStreamer->EmitLabel(GetJTISymbol(JTI));
1626 
1627  for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
1628  EmitJumpTableEntry(MJTI, JTBBs[ii], JTI);
1629  }
1630  if (!JTInDiffSection)
1631  OutStreamer->EmitDataRegion(MCDR_DataRegionEnd);
1632 }
1633 
1634 /// EmitJumpTableEntry - Emit a jump table entry for the specified MBB to the
1635 /// current stream.
1636 void AsmPrinter::EmitJumpTableEntry(const MachineJumpTableInfo *MJTI,
1637  const MachineBasicBlock *MBB,
1638  unsigned UID) const {
1639  assert(MBB && MBB->getNumber() >= 0 && "Invalid basic block");
1640  const MCExpr *Value = nullptr;
1641  switch (MJTI->getEntryKind()) {
1643  llvm_unreachable("Cannot emit EK_Inline jump table entry");
1646  MJTI, MBB, UID, OutContext);
1647  break;
1649  // EK_BlockAddress - Each entry is a plain address of block, e.g.:
1650  // .word LBB123
1651  Value = MCSymbolRefExpr::create(MBB->getSymbol(), OutContext);
1652  break;
1654  // EK_GPRel32BlockAddress - Each entry is an address of block, encoded
1655  // with a relocation as gp-relative, e.g.:
1656  // .gprel32 LBB123
1657  MCSymbol *MBBSym = MBB->getSymbol();
1658  OutStreamer->EmitGPRel32Value(MCSymbolRefExpr::create(MBBSym, OutContext));
1659  return;
1660  }
1661 
1663  // EK_GPRel64BlockAddress - Each entry is an address of block, encoded
1664  // with a relocation as gp-relative, e.g.:
1665  // .gpdword LBB123
1666  MCSymbol *MBBSym = MBB->getSymbol();
1667  OutStreamer->EmitGPRel64Value(MCSymbolRefExpr::create(MBBSym, OutContext));
1668  return;
1669  }
1670 
1672  // Each entry is the address of the block minus the address of the jump
1673  // table. This is used for PIC jump tables where gprel32 is not supported.
1674  // e.g.:
1675  // .word LBB123 - LJTI1_2
1676  // If the .set directive avoids relocations, this is emitted as:
1677  // .set L4_5_set_123, LBB123 - LJTI1_2
1678  // .word L4_5_set_123
1680  Value = MCSymbolRefExpr::create(GetJTSetSymbol(UID, MBB->getNumber()),
1681  OutContext);
1682  break;
1683  }
1684  Value = MCSymbolRefExpr::create(MBB->getSymbol(), OutContext);
1685  const TargetLowering *TLI = MF->getSubtarget().getTargetLowering();
1686  const MCExpr *Base = TLI->getPICJumpTableRelocBaseExpr(MF, UID, OutContext);
1687  Value = MCBinaryExpr::createSub(Value, Base, OutContext);
1688  break;
1689  }
1690  }
1691 
1692  assert(Value && "Unknown entry kind!");
1693 
1694  unsigned EntrySize = MJTI->getEntrySize(getDataLayout());
1695  OutStreamer->EmitValue(Value, EntrySize);
1696 }
1697 
1698 /// EmitSpecialLLVMGlobal - Check to see if the specified global is a
1699 /// special global used by LLVM. If so, emit it and return true, otherwise
1700 /// do nothing and return false.
1702  if (GV->getName() == "llvm.used") {
1703  if (MAI->hasNoDeadStrip()) // No need to emit this at all.
1704  EmitLLVMUsedList(cast<ConstantArray>(GV->getInitializer()));
1705  return true;
1706  }
1707 
1708  // Ignore debug and non-emitted data. This handles llvm.compiler.used.
1709  if (GV->getSection() == "llvm.metadata" ||
1711  return true;
1712 
1713  if (!GV->hasAppendingLinkage()) return false;
1714 
1715  assert(GV->hasInitializer() && "Not a special LLVM global!");
1716 
1717  if (GV->getName() == "llvm.global_ctors") {
1718  EmitXXStructorList(GV->getParent()->getDataLayout(), GV->getInitializer(),
1719  /* isCtor */ true);
1720 
1721  return true;
1722  }
1723 
1724  if (GV->getName() == "llvm.global_dtors") {
1725  EmitXXStructorList(GV->getParent()->getDataLayout(), GV->getInitializer(),
1726  /* isCtor */ false);
1727 
1728  return true;
1729  }
1730 
1731  report_fatal_error("unknown special variable");
1732 }
1733 
1734 /// EmitLLVMUsedList - For targets that define a MAI::UsedDirective, mark each
1735 /// global in the specified llvm.used list for which emitUsedDirectiveFor
1736 /// is true, as being used with this directive.
1737 void AsmPrinter::EmitLLVMUsedList(const ConstantArray *InitList) {
1738  // Should be an array of 'i8*'.
1739  for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
1740  const GlobalValue *GV =
1742  if (GV)
1743  OutStreamer->EmitSymbolAttribute(getSymbol(GV), MCSA_NoDeadStrip);
1744  }
1745 }
1746 
1747 namespace {
1748 
1749 struct Structor {
1750  int Priority = 0;
1751  Constant *Func = nullptr;
1752  GlobalValue *ComdatKey = nullptr;
1753 
1754  Structor() = default;
1755 };
1756 
1757 } // end anonymous namespace
1758 
1759 /// EmitXXStructorList - Emit the ctor or dtor list taking into account the init
1760 /// priority.
1761 void AsmPrinter::EmitXXStructorList(const DataLayout &DL, const Constant *List,
1762  bool isCtor) {
1763  // Should be an array of '{ int, void ()* }' structs. The first value is the
1764  // init priority.
1765  if (!isa<ConstantArray>(List)) return;
1766 
1767  // Sanity check the structors list.
1768  const ConstantArray *InitList = dyn_cast<ConstantArray>(List);
1769  if (!InitList) return; // Not an array!
1770  StructType *ETy = dyn_cast<StructType>(InitList->getType()->getElementType());
1771  // FIXME: Only allow the 3-field form in LLVM 4.0.
1772  if (!ETy || ETy->getNumElements() < 2 || ETy->getNumElements() > 3)
1773  return; // Not an array of two or three elements!
1774  if (!isa<IntegerType>(ETy->getTypeAtIndex(0U)) ||
1775  !isa<PointerType>(ETy->getTypeAtIndex(1U))) return; // Not (int, ptr).
1776  if (ETy->getNumElements() == 3 && !isa<PointerType>(ETy->getTypeAtIndex(2U)))
1777  return; // Not (int, ptr, ptr).
1778 
1779  // Gather the structors in a form that's convenient for sorting by priority.
1780  SmallVector<Structor, 8> Structors;
1781  for (Value *O : InitList->operands()) {
1783  if (!CS) continue; // Malformed.
1784  if (CS->getOperand(1)->isNullValue())
1785  break; // Found a null terminator, skip the rest.
1786  ConstantInt *Priority = dyn_cast<ConstantInt>(CS->getOperand(0));
1787  if (!Priority) continue; // Malformed.
1788  Structors.push_back(Structor());
1789  Structor &S = Structors.back();
1790  S.Priority = Priority->getLimitedValue(65535);
1791  S.Func = CS->getOperand(1);
1792  if (ETy->getNumElements() == 3 && !CS->getOperand(2)->isNullValue())
1793  S.ComdatKey =
1794  dyn_cast<GlobalValue>(CS->getOperand(2)->stripPointerCasts());
1795  }
1796 
1797  // Emit the function pointers in the target-specific order
1798  unsigned Align = Log2_32(DL.getPointerPrefAlignment());
1799  std::stable_sort(Structors.begin(), Structors.end(),
1800  [](const Structor &L,
1801  const Structor &R) { return L.Priority < R.Priority; });
1802  for (Structor &S : Structors) {
1804  const MCSymbol *KeySym = nullptr;
1805  if (GlobalValue *GV = S.ComdatKey) {
1806  if (GV->isDeclarationForLinker())
1807  // If the associated variable is not defined in this module
1808  // (it might be available_externally, or have been an
1809  // available_externally definition that was dropped by the
1810  // EliminateAvailableExternally pass), some other TU
1811  // will provide its dynamic initializer.
1812  continue;
1813 
1814  KeySym = getSymbol(GV);
1815  }
1816  MCSection *OutputSection =
1817  (isCtor ? Obj.getStaticCtorSection(S.Priority, KeySym)
1818  : Obj.getStaticDtorSection(S.Priority, KeySym));
1819  OutStreamer->SwitchSection(OutputSection);
1820  if (OutStreamer->getCurrentSection() != OutStreamer->getPreviousSection())
1821  EmitAlignment(Align);
1822  EmitXXStructor(DL, S.Func);
1823  }
1824 }
1825 
1826 void AsmPrinter::EmitModuleIdents(Module &M) {
1827  if (!MAI->hasIdentDirective())
1828  return;
1829 
1830  if (const NamedMDNode *NMD = M.getNamedMetadata("llvm.ident")) {
1831  for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) {
1832  const MDNode *N = NMD->getOperand(i);
1833  assert(N->getNumOperands() == 1 &&
1834  "llvm.ident metadata entry can have only one operand");
1835  const MDString *S = cast<MDString>(N->getOperand(0));
1836  OutStreamer->EmitIdent(S->getString());
1837  }
1838  }
1839 }
1840 
1841 //===--------------------------------------------------------------------===//
1842 // Emission and print routines
1843 //
1844 
1845 /// EmitInt8 - Emit a byte directive and value.
1846 ///
1847 void AsmPrinter::EmitInt8(int Value) const {
1848  OutStreamer->EmitIntValue(Value, 1);
1849 }
1850 
1851 /// EmitInt16 - Emit a short directive and value.
1852 void AsmPrinter::EmitInt16(int Value) const {
1853  OutStreamer->EmitIntValue(Value, 2);
1854 }
1855 
1856 /// EmitInt32 - Emit a long directive and value.
1857 void AsmPrinter::EmitInt32(int Value) const {
1858  OutStreamer->EmitIntValue(Value, 4);
1859 }
1860 
1861 /// Emit something like ".long Hi-Lo" where the size in bytes of the directive
1862 /// is specified by Size and Hi/Lo specify the labels. This implicitly uses
1863 /// .set if it avoids relocations.
1865  unsigned Size) const {
1866  OutStreamer->emitAbsoluteSymbolDiff(Hi, Lo, Size);
1867 }
1868 
1869 /// EmitLabelPlusOffset - Emit something like ".long Label+Offset"
1870 /// where the size in bytes of the directive is specified by Size and Label
1871 /// specifies the label. This implicitly uses .set if it is available.
1873  unsigned Size,
1874  bool IsSectionRelative) const {
1875  if (MAI->needsDwarfSectionOffsetDirective() && IsSectionRelative) {
1876  OutStreamer->EmitCOFFSecRel32(Label, Offset);
1877  if (Size > 4)
1878  OutStreamer->EmitZeros(Size - 4);
1879  return;
1880  }
1881 
1882  // Emit Label+Offset (or just Label if Offset is zero)
1883  const MCExpr *Expr = MCSymbolRefExpr::create(Label, OutContext);
1884  if (Offset)
1885  Expr = MCBinaryExpr::createAdd(
1886  Expr, MCConstantExpr::create(Offset, OutContext), OutContext);
1887 
1888  OutStreamer->EmitValue(Expr, Size);
1889 }
1890 
1891 //===----------------------------------------------------------------------===//
1892 
1893 // EmitAlignment - Emit an alignment directive to the specified power of
1894 // two boundary. For example, if you pass in 3 here, you will get an 8
1895 // byte alignment. If a global value is specified, and if that global has
1896 // an explicit alignment requested, it will override the alignment request
1897 // if required for correctness.
1898 void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalObject *GV) const {
1899  if (GV)
1900  NumBits = getGVAlignmentLog2(GV, GV->getParent()->getDataLayout(), NumBits);
1901 
1902  if (NumBits == 0) return; // 1-byte aligned: no need to emit alignment.
1903 
1904  assert(NumBits <
1905  static_cast<unsigned>(std::numeric_limits<unsigned>::digits) &&
1906  "undefined behavior");
1907  if (getCurrentSection()->getKind().isText())
1908  OutStreamer->EmitCodeAlignment(1u << NumBits);
1909  else
1910  OutStreamer->EmitValueToAlignment(1u << NumBits);
1911 }
1912 
1913 //===----------------------------------------------------------------------===//
1914 // Constant emission.
1915 //===----------------------------------------------------------------------===//
1916 
1918  MCContext &Ctx = OutContext;
1919 
1920  if (CV->isNullValue() || isa<UndefValue>(CV))
1921  return MCConstantExpr::create(0, Ctx);
1922 
1923  if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV))
1924  return MCConstantExpr::create(CI->getZExtValue(), Ctx);
1925 
1926  if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV))
1927  return MCSymbolRefExpr::create(getSymbol(GV), Ctx);
1928 
1929  if (const BlockAddress *BA = dyn_cast<BlockAddress>(CV))
1931 
1932  const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV);
1933  if (!CE) {
1934  llvm_unreachable("Unknown constant value to lower!");
1935  }
1936 
1937  switch (CE->getOpcode()) {
1938  default:
1939  // If the code isn't optimized, there may be outstanding folding
1940  // opportunities. Attempt to fold the expression using DataLayout as a
1941  // last resort before giving up.
1943  if (C != CE)
1944  return lowerConstant(C);
1945 
1946  // Otherwise report the problem to the user.
1947  {
1948  std::string S;
1949  raw_string_ostream OS(S);
1950  OS << "Unsupported expression in static initializer: ";
1951  CE->printAsOperand(OS, /*PrintType=*/false,
1952  !MF ? nullptr : MF->getFunction().getParent());
1953  report_fatal_error(OS.str());
1954  }
1955  case Instruction::GetElementPtr: {
1956  // Generate a symbolic expression for the byte address
1957  APInt OffsetAI(getDataLayout().getPointerTypeSizeInBits(CE->getType()), 0);
1958  cast<GEPOperator>(CE)->accumulateConstantOffset(getDataLayout(), OffsetAI);
1959 
1960  const MCExpr *Base = lowerConstant(CE->getOperand(0));
1961  if (!OffsetAI)
1962  return Base;
1963 
1964  int64_t Offset = OffsetAI.getSExtValue();
1965  return MCBinaryExpr::createAdd(Base, MCConstantExpr::create(Offset, Ctx),
1966  Ctx);
1967  }
1968 
1969  case Instruction::Trunc:
1970  // We emit the value and depend on the assembler to truncate the generated
1971  // expression properly. This is important for differences between
1972  // blockaddress labels. Since the two labels are in the same function, it
1973  // is reasonable to treat their delta as a 32-bit value.
1975  case Instruction::BitCast:
1976  return lowerConstant(CE->getOperand(0));
1977 
1978  case Instruction::IntToPtr: {
1979  const DataLayout &DL = getDataLayout();
1980 
1981  // Handle casts to pointers by changing them into casts to the appropriate
1982  // integer type. This promotes constant folding and simplifies this code.
1983  Constant *Op = CE->getOperand(0);
1985  false/*ZExt*/);
1986  return lowerConstant(Op);
1987  }
1988 
1989  case Instruction::PtrToInt: {
1990  const DataLayout &DL = getDataLayout();
1991 
1992  // Support only foldable casts to/from pointers that can be eliminated by
1993  // changing the pointer to the appropriately sized integer type.
1994  Constant *Op = CE->getOperand(0);
1995  Type *Ty = CE->getType();
1996 
1997  const MCExpr *OpExpr = lowerConstant(Op);
1998 
1999  // We can emit the pointer value into this slot if the slot is an
2000  // integer slot equal to the size of the pointer.
2001  if (DL.getTypeAllocSize(Ty) == DL.getTypeAllocSize(Op->getType()))
2002  return OpExpr;
2003 
2004  // Otherwise the pointer is smaller than the resultant integer, mask off
2005  // the high bits so we are sure to get a proper truncation if the input is
2006  // a constant expr.
2007  unsigned InBits = DL.getTypeAllocSizeInBits(Op->getType());
2008  const MCExpr *MaskExpr = MCConstantExpr::create(~0ULL >> (64-InBits), Ctx);
2009  return MCBinaryExpr::createAnd(OpExpr, MaskExpr, Ctx);
2010  }
2011 
2012  case Instruction::Sub: {
2013  GlobalValue *LHSGV;
2014  APInt LHSOffset;
2015  if (IsConstantOffsetFromGlobal(CE->getOperand(0), LHSGV, LHSOffset,
2016  getDataLayout())) {
2017  GlobalValue *RHSGV;
2018  APInt RHSOffset;
2019  if (IsConstantOffsetFromGlobal(CE->getOperand(1), RHSGV, RHSOffset,
2020  getDataLayout())) {
2021  const MCExpr *RelocExpr =
2022  getObjFileLowering().lowerRelativeReference(LHSGV, RHSGV, TM);
2023  if (!RelocExpr)
2024  RelocExpr = MCBinaryExpr::createSub(
2025  MCSymbolRefExpr::create(getSymbol(LHSGV), Ctx),
2026  MCSymbolRefExpr::create(getSymbol(RHSGV), Ctx), Ctx);
2027  int64_t Addend = (LHSOffset - RHSOffset).getSExtValue();
2028  if (Addend != 0)
2029  RelocExpr = MCBinaryExpr::createAdd(
2030  RelocExpr, MCConstantExpr::create(Addend, Ctx), Ctx);
2031  return RelocExpr;
2032  }
2033  }
2034  }
2035  // else fallthrough
2036 
2037  // The MC library also has a right-shift operator, but it isn't consistently
2038  // signed or unsigned between different targets.
2039  case Instruction::Add:
2040  case Instruction::Mul:
2041  case Instruction::SDiv:
2042  case Instruction::SRem:
2043  case Instruction::Shl:
2044  case Instruction::And:
2045  case Instruction::Or:
2046  case Instruction::Xor: {
2047  const MCExpr *LHS = lowerConstant(CE->getOperand(0));
2048  const MCExpr *RHS = lowerConstant(CE->getOperand(1));
2049  switch (CE->getOpcode()) {
2050  default: llvm_unreachable("Unknown binary operator constant cast expr");
2051  case Instruction::Add: return MCBinaryExpr::createAdd(LHS, RHS, Ctx);
2052  case Instruction::Sub: return MCBinaryExpr::createSub(LHS, RHS, Ctx);
2053  case Instruction::Mul: return MCBinaryExpr::createMul(LHS, RHS, Ctx);
2054  case Instruction::SDiv: return MCBinaryExpr::createDiv(LHS, RHS, Ctx);
2055  case Instruction::SRem: return MCBinaryExpr::createMod(LHS, RHS, Ctx);
2056  case Instruction::Shl: return MCBinaryExpr::createShl(LHS, RHS, Ctx);
2057  case Instruction::And: return MCBinaryExpr::createAnd(LHS, RHS, Ctx);
2058  case Instruction::Or: return MCBinaryExpr::createOr (LHS, RHS, Ctx);
2059  case Instruction::Xor: return MCBinaryExpr::createXor(LHS, RHS, Ctx);
2060  }
2061  }
2062  }
2063 }
2064 
2065 static void emitGlobalConstantImpl(const DataLayout &DL, const Constant *C,
2066  AsmPrinter &AP,
2067  const Constant *BaseCV = nullptr,
2068  uint64_t Offset = 0);
2069 
2070 static void emitGlobalConstantFP(const ConstantFP *CFP, AsmPrinter &AP);
2071 
2072 /// isRepeatedByteSequence - Determine whether the given value is
2073 /// composed of a repeated sequence of identical bytes and return the
2074 /// byte value. If it is not a repeated sequence, return -1.
2077  assert(!Data.empty() && "Empty aggregates should be CAZ node");
2078  char C = Data[0];
2079  for (unsigned i = 1, e = Data.size(); i != e; ++i)
2080  if (Data[i] != C) return -1;
2081  return static_cast<uint8_t>(C); // Ensure 255 is not returned as -1.
2082 }
2083 
2084 /// isRepeatedByteSequence - Determine whether the given value is
2085 /// composed of a repeated sequence of identical bytes and return the
2086 /// byte value. If it is not a repeated sequence, return -1.
2087 static int isRepeatedByteSequence(const Value *V, const DataLayout &DL) {
2088  if (const ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
2089  uint64_t Size = DL.getTypeAllocSizeInBits(V->getType());
2090  assert(Size % 8 == 0);
2091 
2092  // Extend the element to take zero padding into account.
2093  APInt Value = CI->getValue().zextOrSelf(Size);
2094  if (!Value.isSplat(8))
2095  return -1;
2096 
2097  return Value.zextOrTrunc(8).getZExtValue();
2098  }
2099  if (const ConstantArray *CA = dyn_cast<ConstantArray>(V)) {
2100  // Make sure all array elements are sequences of the same repeated
2101  // byte.
2102  assert(CA->getNumOperands() != 0 && "Should be a CAZ");
2103  Constant *Op0 = CA->getOperand(0);
2104  int Byte = isRepeatedByteSequence(Op0, DL);
2105  if (Byte == -1)
2106  return -1;
2107 
2108  // All array elements must be equal.
2109  for (unsigned i = 1, e = CA->getNumOperands(); i != e; ++i)
2110  if (CA->getOperand(i) != Op0)
2111  return -1;
2112  return Byte;
2113  }
2114 
2115  if (const ConstantDataSequential *CDS = dyn_cast<ConstantDataSequential>(V))
2116  return isRepeatedByteSequence(CDS);
2117 
2118  return -1;
2119 }
2120 
2122  const ConstantDataSequential *CDS,
2123  AsmPrinter &AP) {
2124  // See if we can aggregate this into a .fill, if so, emit it as such.
2125  int Value = isRepeatedByteSequence(CDS, DL);
2126  if (Value != -1) {
2127  uint64_t Bytes = DL.getTypeAllocSize(CDS->getType());
2128  // Don't emit a 1-byte object as a .fill.
2129  if (Bytes > 1)
2130  return AP.OutStreamer->emitFill(Bytes, Value);
2131  }
2132 
2133  // If this can be emitted with .ascii/.asciz, emit it as such.
2134  if (CDS->isString())
2135  return AP.OutStreamer->EmitBytes(CDS->getAsString());
2136 
2137  // Otherwise, emit the values in successive locations.
2138  unsigned ElementByteSize = CDS->getElementByteSize();
2139  if (isa<IntegerType>(CDS->getElementType())) {
2140  for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) {
2141  if (AP.isVerbose())
2142  AP.OutStreamer->GetCommentOS() << format("0x%" PRIx64 "\n",
2143  CDS->getElementAsInteger(i));
2144  AP.OutStreamer->EmitIntValue(CDS->getElementAsInteger(i),
2145  ElementByteSize);
2146  }
2147  } else {
2148  for (unsigned I = 0, E = CDS->getNumElements(); I != E; ++I)
2149  emitGlobalConstantFP(cast<ConstantFP>(CDS->getElementAsConstant(I)), AP);
2150  }
2151 
2152  unsigned Size = DL.getTypeAllocSize(CDS->getType());
2153  unsigned EmittedSize = DL.getTypeAllocSize(CDS->getType()->getElementType()) *
2154  CDS->getNumElements();
2155  if (unsigned Padding = Size - EmittedSize)
2156  AP.OutStreamer->EmitZeros(Padding);
2157 }
2158 
2159 static void emitGlobalConstantArray(const DataLayout &DL,
2160  const ConstantArray *CA, AsmPrinter &AP,
2161  const Constant *BaseCV, uint64_t Offset) {
2162  // See if we can aggregate some values. Make sure it can be
2163  // represented as a series of bytes of the constant value.
2164  int Value = isRepeatedByteSequence(CA, DL);
2165 
2166  if (Value != -1) {
2167  uint64_t Bytes = DL.getTypeAllocSize(CA->getType());
2168  AP.OutStreamer->emitFill(Bytes, Value);
2169  }
2170  else {
2171  for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i) {
2172  emitGlobalConstantImpl(DL, CA->getOperand(i), AP, BaseCV, Offset);
2173  Offset += DL.getTypeAllocSize(CA->getOperand(i)->getType());
2174  }
2175  }
2176 }
2177 
2178 static void emitGlobalConstantVector(const DataLayout &DL,
2179  const ConstantVector *CV, AsmPrinter &AP) {
2180  for (unsigned i = 0, e = CV->getType()->getNumElements(); i != e; ++i)
2181  emitGlobalConstantImpl(DL, CV->getOperand(i), AP);
2182 
2183  unsigned Size = DL.getTypeAllocSize(CV->getType());
2184  unsigned EmittedSize = DL.getTypeAllocSize(CV->getType()->getElementType()) *
2185  CV->getType()->getNumElements();
2186  if (unsigned Padding = Size - EmittedSize)
2187  AP.OutStreamer->EmitZeros(Padding);
2188 }
2189 
2190 static void emitGlobalConstantStruct(const DataLayout &DL,
2191  const ConstantStruct *CS, AsmPrinter &AP,
2192  const Constant *BaseCV, uint64_t Offset) {
2193  // Print the fields in successive locations. Pad to align if needed!
2194  unsigned Size = DL.getTypeAllocSize(CS->getType());
2195  const StructLayout *Layout = DL.getStructLayout(CS->getType());
2196  uint64_t SizeSoFar = 0;
2197  for (unsigned i = 0, e = CS->getNumOperands(); i != e; ++i) {
2198  const Constant *Field = CS->getOperand(i);
2199 
2200  // Print the actual field value.
2201  emitGlobalConstantImpl(DL, Field, AP, BaseCV, Offset + SizeSoFar);
2202 
2203  // Check if padding is needed and insert one or more 0s.
2204  uint64_t FieldSize = DL.getTypeAllocSize(Field->getType());
2205  uint64_t PadSize = ((i == e-1 ? Size : Layout->getElementOffset(i+1))
2206  - Layout->getElementOffset(i)) - FieldSize;
2207  SizeSoFar += FieldSize + PadSize;
2208 
2209  // Insert padding - this may include padding to increase the size of the
2210  // current field up to the ABI size (if the struct is not packed) as well
2211  // as padding to ensure that the next field starts at the right offset.
2212  AP.OutStreamer->EmitZeros(PadSize);
2213  }
2214  assert(SizeSoFar == Layout->getSizeInBytes() &&
2215  "Layout of constant struct may be incorrect!");
2216 }
2217 
2218 static void emitGlobalConstantFP(const ConstantFP *CFP, AsmPrinter &AP) {
2219  APInt API = CFP->getValueAPF().bitcastToAPInt();
2220 
2221  // First print a comment with what we think the original floating-point value
2222  // should have been.
2223  if (AP.isVerbose()) {
2225  CFP->getValueAPF().toString(StrVal);
2226 
2227  if (CFP->getType())
2228  CFP->getType()->print(AP.OutStreamer->GetCommentOS());
2229  else
2230  AP.OutStreamer->GetCommentOS() << "Printing <null> Type";
2231  AP.OutStreamer->GetCommentOS() << ' ' << StrVal << '\n';
2232  }
2233 
2234  // Now iterate through the APInt chunks, emitting them in endian-correct
2235  // order, possibly with a smaller chunk at beginning/end (e.g. for x87 80-bit
2236  // floats).
2237  unsigned NumBytes = API.getBitWidth() / 8;
2238  unsigned TrailingBytes = NumBytes % sizeof(uint64_t);
2239  const uint64_t *p = API.getRawData();
2240 
2241  // PPC's long double has odd notions of endianness compared to how LLVM
2242  // handles it: p[0] goes first for *big* endian on PPC.
2243  if (AP.getDataLayout().isBigEndian() && !CFP->getType()->isPPC_FP128Ty()) {
2244  int Chunk = API.getNumWords() - 1;
2245 
2246  if (TrailingBytes)
2247  AP.OutStreamer->EmitIntValue(p[Chunk--], TrailingBytes);
2248 
2249  for (; Chunk >= 0; --Chunk)
2250  AP.OutStreamer->EmitIntValue(p[Chunk], sizeof(uint64_t));
2251  } else {
2252  unsigned Chunk;
2253  for (Chunk = 0; Chunk < NumBytes / sizeof(uint64_t); ++Chunk)
2254  AP.OutStreamer->EmitIntValue(p[Chunk], sizeof(uint64_t));
2255 
2256  if (TrailingBytes)
2257  AP.OutStreamer->EmitIntValue(p[Chunk], TrailingBytes);
2258  }
2259 
2260  // Emit the tail padding for the long double.
2261  const DataLayout &DL = AP.getDataLayout();
2262  AP.OutStreamer->EmitZeros(DL.getTypeAllocSize(CFP->getType()) -
2263  DL.getTypeStoreSize(CFP->getType()));
2264 }
2265 
2267  const DataLayout &DL = AP.getDataLayout();
2268  unsigned BitWidth = CI->getBitWidth();
2269 
2270  // Copy the value as we may massage the layout for constants whose bit width
2271  // is not a multiple of 64-bits.
2272  APInt Realigned(CI->getValue());
2273  uint64_t ExtraBits = 0;
2274  unsigned ExtraBitsSize = BitWidth & 63;
2275 
2276  if (ExtraBitsSize) {
2277  // The bit width of the data is not a multiple of 64-bits.
2278  // The extra bits are expected to be at the end of the chunk of the memory.
2279  // Little endian:
2280  // * Nothing to be done, just record the extra bits to emit.
2281  // Big endian:
2282  // * Record the extra bits to emit.
2283  // * Realign the raw data to emit the chunks of 64-bits.
2284  if (DL.isBigEndian()) {
2285  // Basically the structure of the raw data is a chunk of 64-bits cells:
2286  // 0 1 BitWidth / 64
2287  // [chunk1][chunk2] ... [chunkN].
2288  // The most significant chunk is chunkN and it should be emitted first.
2289  // However, due to the alignment issue chunkN contains useless bits.
2290  // Realign the chunks so that they contain only useless information:
2291  // ExtraBits 0 1 (BitWidth / 64) - 1
2292  // chu[nk1 chu][nk2 chu] ... [nkN-1 chunkN]
2293  ExtraBits = Realigned.getRawData()[0] &
2294  (((uint64_t)-1) >> (64 - ExtraBitsSize));
2295  Realigned.lshrInPlace(ExtraBitsSize);
2296  } else
2297  ExtraBits = Realigned.getRawData()[BitWidth / 64];
2298  }
2299 
2300  // We don't expect assemblers to support integer data directives
2301  // for more than 64 bits, so we emit the data in at most 64-bit
2302  // quantities at a time.
2303  const uint64_t *RawData = Realigned.getRawData();
2304  for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) {
2305  uint64_t Val = DL.isBigEndian() ? RawData[e - i - 1] : RawData[i];
2306  AP.OutStreamer->EmitIntValue(Val, 8);
2307  }
2308 
2309  if (ExtraBitsSize) {
2310  // Emit the extra bits after the 64-bits chunks.
2311 
2312  // Emit a directive that fills the expected size.
2313  uint64_t Size = AP.getDataLayout().getTypeAllocSize(CI->getType());
2314  Size -= (BitWidth / 64) * 8;
2315  assert(Size && Size * 8 >= ExtraBitsSize &&
2316  (ExtraBits & (((uint64_t)-1) >> (64 - ExtraBitsSize)))
2317  == ExtraBits && "Directive too small for extra bits.");
2318  AP.OutStreamer->EmitIntValue(ExtraBits, Size);
2319  }
2320 }
2321 
2322 /// \brief Transform a not absolute MCExpr containing a reference to a GOT
2323 /// equivalent global, by a target specific GOT pc relative access to the
2324 /// final symbol.
2325 static void handleIndirectSymViaGOTPCRel(AsmPrinter &AP, const MCExpr **ME,
2326  const Constant *BaseCst,
2327  uint64_t Offset) {
2328  // The global @foo below illustrates a global that uses a got equivalent.
2329  //
2330  // @bar = global i32 42
2331  // @gotequiv = private unnamed_addr constant i32* @bar
2332  // @foo = i32 trunc (i64 sub (i64 ptrtoint (i32** @gotequiv to i64),
2333  // i64 ptrtoint (i32* @foo to i64))
2334  // to i32)
2335  //
2336  // The cstexpr in @foo is converted into the MCExpr `ME`, where we actually
2337  // check whether @foo is suitable to use a GOTPCREL. `ME` is usually in the
2338  // form:
2339  //
2340  // foo = cstexpr, where
2341  // cstexpr := <gotequiv> - "." + <cst>
2342  // cstexpr := <gotequiv> - (<foo> - <offset from @foo base>) + <cst>
2343  //
2344  // After canonicalization by evaluateAsRelocatable `ME` turns into:
2345  //
2346  // cstexpr := <gotequiv> - <foo> + gotpcrelcst, where
2347  // gotpcrelcst := <offset from @foo base> + <cst>
2348  MCValue MV;
2349  if (!(*ME)->evaluateAsRelocatable(MV, nullptr, nullptr) || MV.isAbsolute())
2350  return;
2351  const MCSymbolRefExpr *SymA = MV.getSymA();
2352  if (!SymA)
2353  return;
2354 
2355  // Check that GOT equivalent symbol is cached.
2356  const MCSymbol *GOTEquivSym = &SymA->getSymbol();
2357  if (!AP.GlobalGOTEquivs.count(GOTEquivSym))
2358  return;
2359 
2360  const GlobalValue *BaseGV = dyn_cast_or_null<GlobalValue>(BaseCst);
2361  if (!BaseGV)
2362  return;
2363 
2364  // Check for a valid base symbol
2365  const MCSymbol *BaseSym = AP.getSymbol(BaseGV);
2366  const MCSymbolRefExpr *SymB = MV.getSymB();
2367 
2368  if (!SymB || BaseSym != &SymB->getSymbol())
2369  return;
2370 
2371  // Make sure to match:
2372  //
2373  // gotpcrelcst := <offset from @foo base> + <cst>
2374  //
2375  // If gotpcrelcst is positive it means that we can safely fold the pc rel
2376  // displacement into the GOTPCREL. We can also can have an extra offset <cst>
2377  // if the target knows how to encode it.
2378  int64_t GOTPCRelCst = Offset + MV.getConstant();
2379  if (GOTPCRelCst < 0)
2380  return;
2381  if (!AP.getObjFileLowering().supportGOTPCRelWithOffset() && GOTPCRelCst != 0)
2382  return;
2383 
2384  // Emit the GOT PC relative to replace the got equivalent global, i.e.:
2385  //
2386  // bar:
2387  // .long 42
2388  // gotequiv:
2389  // .quad bar
2390  // foo:
2391  // .long gotequiv - "." + <cst>
2392  //
2393  // is replaced by the target specific equivalent to:
2394  //
2395  // bar:
2396  // .long 42
2397  // foo:
2398  // .long bar@GOTPCREL+<gotpcrelcst>
2399  AsmPrinter::GOTEquivUsePair Result = AP.GlobalGOTEquivs[GOTEquivSym];
2400  const GlobalVariable *GV = Result.first;
2401  int NumUses = (int)Result.second;
2402  const GlobalValue *FinalGV = dyn_cast<GlobalValue>(GV->getOperand(0));
2403  const MCSymbol *FinalSym = AP.getSymbol(FinalGV);
2405  FinalSym, MV, Offset, AP.MMI, *AP.OutStreamer);
2406 
2407  // Update GOT equivalent usage information
2408  --NumUses;
2409  if (NumUses >= 0)
2410  AP.GlobalGOTEquivs[GOTEquivSym] = std::make_pair(GV, NumUses);
2411 }
2412 
2413 static void emitGlobalConstantImpl(const DataLayout &DL, const Constant *CV,
2414  AsmPrinter &AP, const Constant *BaseCV,
2415  uint64_t Offset) {
2416  uint64_t Size = DL.getTypeAllocSize(CV->getType());
2417 
2418  // Globals with sub-elements such as combinations of arrays and structs
2419  // are handled recursively by emitGlobalConstantImpl. Keep track of the
2420  // constant symbol base and the current position with BaseCV and Offset.
2421  if (!BaseCV && CV->hasOneUse())
2422  BaseCV = dyn_cast<Constant>(CV->user_back());
2423 
2424  if (isa<ConstantAggregateZero>(CV) || isa<UndefValue>(CV))
2425  return AP.OutStreamer->EmitZeros(Size);
2426 
2427  if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
2428  switch (Size) {
2429  case 1:
2430  case 2:
2431  case 4:
2432  case 8:
2433  if (AP.isVerbose())
2434  AP.OutStreamer->GetCommentOS() << format("0x%" PRIx64 "\n",
2435  CI->getZExtValue());
2436  AP.OutStreamer->EmitIntValue(CI->getZExtValue(), Size);
2437  return;
2438  default:
2440  return;
2441  }
2442  }
2443 
2444  if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV))
2445  return emitGlobalConstantFP(CFP, AP);
2446 
2447  if (isa<ConstantPointerNull>(CV)) {
2448  AP.OutStreamer->EmitIntValue(0, Size);
2449  return;
2450  }
2451 
2452  if (const ConstantDataSequential *CDS = dyn_cast<ConstantDataSequential>(CV))
2453  return emitGlobalConstantDataSequential(DL, CDS, AP);
2454 
2455  if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV))
2456  return emitGlobalConstantArray(DL, CVA, AP, BaseCV, Offset);
2457 
2458  if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV))
2459  return emitGlobalConstantStruct(DL, CVS, AP, BaseCV, Offset);
2460 
2461  if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) {
2462  // Look through bitcasts, which might not be able to be MCExpr'ized (e.g. of
2463  // vectors).
2464  if (CE->getOpcode() == Instruction::BitCast)
2465  return emitGlobalConstantImpl(DL, CE->getOperand(0), AP);
2466 
2467  if (Size > 8) {
2468  // If the constant expression's size is greater than 64-bits, then we have
2469  // to emit the value in chunks. Try to constant fold the value and emit it
2470  // that way.
2471  Constant *New = ConstantFoldConstant(CE, DL);
2472  if (New && New != CE)
2473  return emitGlobalConstantImpl(DL, New, AP);
2474  }
2475  }
2476 
2477  if (const ConstantVector *V = dyn_cast<ConstantVector>(CV))
2478  return emitGlobalConstantVector(DL, V, AP);
2479 
2480  // Otherwise, it must be a ConstantExpr. Lower it to an MCExpr, then emit it
2481  // thread the streamer with EmitValue.
2482  const MCExpr *ME = AP.lowerConstant(CV);
2483 
2484  // Since lowerConstant already folded and got rid of all IR pointer and
2485  // integer casts, detect GOT equivalent accesses by looking into the MCExpr
2486  // directly.
2488  handleIndirectSymViaGOTPCRel(AP, &ME, BaseCV, Offset);
2489 
2490  AP.OutStreamer->EmitValue(ME, Size);
2491 }
2492 
2493 /// EmitGlobalConstant - Print a general LLVM constant to the .s file.
2495  uint64_t Size = DL.getTypeAllocSize(CV->getType());
2496  if (Size)
2497  emitGlobalConstantImpl(DL, CV, *this);
2498  else if (MAI->hasSubsectionsViaSymbols()) {
2499  // If the global has zero size, emit a single byte so that two labels don't
2500  // look like they are at the same location.
2501  OutStreamer->EmitIntValue(0, 1);
2502  }
2503 }
2504 
2506  // Target doesn't support this yet!
2507  llvm_unreachable("Target does not support EmitMachineConstantPoolValue");
2508 }
2509 
2510 void AsmPrinter::printOffset(int64_t Offset, raw_ostream &OS) const {
2511  if (Offset > 0)
2512  OS << '+' << Offset;
2513  else if (Offset < 0)
2514  OS << Offset;
2515 }
2516 
2517 //===----------------------------------------------------------------------===//
2518 // Symbol Lowering Routines.
2519 //===----------------------------------------------------------------------===//
2520 
2522  return OutContext.createTempSymbol(Name, true);
2523 }
2524 
2526  return MMI->getAddrLabelSymbol(BA->getBasicBlock());
2527 }
2528 
2530  return MMI->getAddrLabelSymbol(BB);
2531 }
2532 
2533 /// GetCPISymbol - Return the symbol for the specified constant pool entry.
2534 MCSymbol *AsmPrinter::GetCPISymbol(unsigned CPID) const {
2535  const DataLayout &DL = getDataLayout();
2537  "CPI" + Twine(getFunctionNumber()) + "_" +
2538  Twine(CPID));
2539 }
2540 
2541 /// GetJTISymbol - Return the symbol for the specified jump table entry.
2542 MCSymbol *AsmPrinter::GetJTISymbol(unsigned JTID, bool isLinkerPrivate) const {
2543  return MF->getJTISymbol(JTID, OutContext, isLinkerPrivate);
2544 }
2545 
2546 /// GetJTSetSymbol - Return the symbol for the specified jump table .set
2547 /// FIXME: privatize to AsmPrinter.
2548 MCSymbol *AsmPrinter::GetJTSetSymbol(unsigned UID, unsigned MBBID) const {
2549  const DataLayout &DL = getDataLayout();
2551  Twine(getFunctionNumber()) + "_" +
2552  Twine(UID) + "_set_" + Twine(MBBID));
2553 }
2554 
2556  StringRef Suffix) const {
2557  return getObjFileLowering().getSymbolWithGlobalValueBase(GV, Suffix, TM);
2558 }
2559 
2560 /// Return the MCSymbol for the specified ExternalSymbol.
2562  SmallString<60> NameStr;
2563  Mangler::getNameWithPrefix(NameStr, Sym, getDataLayout());
2564  return OutContext.getOrCreateSymbol(NameStr);
2565 }
2566 
2567 /// PrintParentLoopComment - Print comments about parent loops of this one.
2569  unsigned FunctionNumber) {
2570  if (!Loop) return;
2572  OS.indent(Loop->getLoopDepth()*2)
2573  << "Parent Loop BB" << FunctionNumber << "_"
2574  << Loop->getHeader()->getNumber()
2575  << " Depth=" << Loop->getLoopDepth() << '\n';
2576 }
2577 
2578 /// PrintChildLoopComment - Print comments about child loops within
2579 /// the loop for this basic block, with nesting.
2581  unsigned FunctionNumber) {
2582  // Add child loop information
2583  for (const MachineLoop *CL : *Loop) {
2584  OS.indent(CL->getLoopDepth()*2)
2585  << "Child Loop BB" << FunctionNumber << "_"
2586  << CL->getHeader()->getNumber() << " Depth " << CL->getLoopDepth()
2587  << '\n';
2588  PrintChildLoopComment(OS, CL, FunctionNumber);
2589  }
2590 }
2591 
2592 /// emitBasicBlockLoopComments - Pretty-print comments for basic blocks.
2594  const MachineLoopInfo *LI,
2595  const AsmPrinter &AP) {
2596  // Add loop depth information
2597  const MachineLoop *Loop = LI->getLoopFor(&MBB);
2598  if (!Loop) return;
2599 
2600  MachineBasicBlock *Header = Loop->getHeader();
2601  assert(Header && "No header for loop");
2602 
2603  // If this block is not a loop header, just print out what is the loop header
2604  // and return.
2605  if (Header != &MBB) {
2606  AP.OutStreamer->AddComment(" in Loop: Header=BB" +
2607  Twine(AP.getFunctionNumber())+"_" +
2608  Twine(Loop->getHeader()->getNumber())+
2609  " Depth="+Twine(Loop->getLoopDepth()));
2610  return;
2611  }
2612 
2613  // Otherwise, it is a loop header. Print out information about child and
2614  // parent loops.
2615  raw_ostream &OS = AP.OutStreamer->GetCommentOS();
2616 
2618 
2619  OS << "=>";
2620  OS.indent(Loop->getLoopDepth()*2-2);
2621 
2622  OS << "This ";
2623  if (Loop->empty())
2624  OS << "Inner ";
2625  OS << "Loop Header: Depth=" + Twine(Loop->getLoopDepth()) << '\n';
2626 
2627  PrintChildLoopComment(OS, Loop, AP.getFunctionNumber());
2628 }
2629 
2630 void AsmPrinter::setupCodePaddingContext(const MachineBasicBlock &MBB,
2631  MCCodePaddingContext &Context) const {
2632  assert(MF != nullptr && "Machine function must be valid");
2633  assert(LI != nullptr && "Loop info must be valid");
2634  Context.IsPaddingActive = !MF->hasInlineAsm() &&
2635  !MF->getFunction().optForSize() &&
2637  const MachineLoop *CurrentLoop = LI->getLoopFor(&MBB);
2639  CurrentLoop != nullptr && CurrentLoop->getSubLoops().empty();
2641  std::find(MBB.pred_begin(), MBB.pred_end(), MBB.getPrevNode()) !=
2642  MBB.pred_end();
2644  MBB.pred_size() > 0 && !isBlockOnlyReachableByFallthrough(&MBB);
2645 }
2646 
2647 /// EmitBasicBlockStart - This method prints the label for the specified
2648 /// MachineBasicBlock, an alignment (if present) and a comment describing
2649 /// it if appropriate.
2651  // End the previous funclet and start a new one.
2652  if (MBB.isEHFuncletEntry()) {
2653  for (const HandlerInfo &HI : Handlers) {
2654  HI.Handler->endFunclet();
2655  HI.Handler->beginFunclet(MBB);
2656  }
2657  }
2658 
2659  // Emit an alignment directive for this block, if needed.
2660  if (unsigned Align = MBB.getAlignment())
2663  setupCodePaddingContext(MBB, Context);
2664  OutStreamer->EmitCodePaddingBasicBlockStart(Context);
2665 
2666  // If the block has its address taken, emit any labels that were used to
2667  // reference the block. It is possible that there is more than one label
2668  // here, because multiple LLVM BB's may have been RAUW'd to this block after
2669  // the references were generated.
2670  if (MBB.hasAddressTaken()) {
2671  const BasicBlock *BB = MBB.getBasicBlock();
2672  if (isVerbose())
2673  OutStreamer->AddComment("Block address taken");
2674 
2675  // MBBs can have their address taken as part of CodeGen without having
2676  // their corresponding BB's address taken in IR
2677  if (BB->hasAddressTaken())
2678  for (MCSymbol *Sym : MMI->getAddrLabelSymbolToEmit(BB))
2679  OutStreamer->EmitLabel(Sym);
2680  }
2681 
2682  // Print some verbose block comments.
2683  if (isVerbose()) {
2684  if (const BasicBlock *BB = MBB.getBasicBlock()) {
2685  if (BB->hasName()) {
2686  BB->printAsOperand(OutStreamer->GetCommentOS(),
2687  /*PrintType=*/false, BB->getModule());
2688  OutStreamer->GetCommentOS() << '\n';
2689  }
2690  }
2691  emitBasicBlockLoopComments(MBB, LI, *this);
2692  }
2693 
2694  // Print the main label for the block.
2695  if (MBB.pred_empty() ||
2697  if (isVerbose()) {
2698  // NOTE: Want this comment at start of line, don't emit with AddComment.
2699  OutStreamer->emitRawComment(" %bb." + Twine(MBB.getNumber()) + ":",
2700  false);
2701  }
2702  } else {
2703  OutStreamer->EmitLabel(MBB.getSymbol());
2704  }
2705 }
2706 
2709  setupCodePaddingContext(MBB, Context);
2710  OutStreamer->EmitCodePaddingBasicBlockEnd(Context);
2711 }
2712 
2713 void AsmPrinter::EmitVisibility(MCSymbol *Sym, unsigned Visibility,
2714  bool IsDefinition) const {
2715  MCSymbolAttr Attr = MCSA_Invalid;
2716 
2717  switch (Visibility) {
2718  default: break;
2720  if (IsDefinition)
2721  Attr = MAI->getHiddenVisibilityAttr();
2722  else
2724  break;
2726  Attr = MAI->getProtectedVisibilityAttr();
2727  break;
2728  }
2729 
2730  if (Attr != MCSA_Invalid)
2731  OutStreamer->EmitSymbolAttribute(Sym, Attr);
2732 }
2733 
2734 /// isBlockOnlyReachableByFallthough - Return true if the basic block has
2735 /// exactly one predecessor and the control transfer mechanism between
2736 /// the predecessor and this block is a fall-through.
2737 bool AsmPrinter::
2739  // If this is a landing pad, it isn't a fall through. If it has no preds,
2740  // then nothing falls through to it.
2741  if (MBB->isEHPad() || MBB->pred_empty())
2742  return false;
2743 
2744  // If there isn't exactly one predecessor, it can't be a fall through.
2745  if (MBB->pred_size() > 1)
2746  return false;
2747 
2748  // The predecessor has to be immediately before this block.
2749  MachineBasicBlock *Pred = *MBB->pred_begin();
2750  if (!Pred->isLayoutSuccessor(MBB))
2751  return false;
2752 
2753  // If the block is completely empty, then it definitely does fall through.
2754  if (Pred->empty())
2755  return true;
2756 
2757  // Check the terminators in the previous blocks
2758  for (const auto &MI : Pred->terminators()) {
2759  // If it is not a simple branch, we are in a table somewhere.
2760  if (!MI.isBranch() || MI.isIndirectBranch())
2761  return false;
2762 
2763  // If we are the operands of one of the branches, this is not a fall
2764  // through. Note that targets with delay slots will usually bundle
2765  // terminators with the delay slot instruction.
2766  for (ConstMIBundleOperands OP(MI); OP.isValid(); ++OP) {
2767  if (OP->isJTI())
2768  return false;
2769  if (OP->isMBB() && OP->getMBB() == MBB)
2770  return false;
2771  }
2772  }
2773 
2774  return true;
2775 }
2776 
2777 GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy &S) {
2778  if (!S.usesMetadata())
2779  return nullptr;
2780 
2781  assert(!S.useStatepoints() && "statepoints do not currently support custom"
2782  " stackmap formats, please see the documentation for a description of"
2783  " the default format. If you really need a custom serialized format,"
2784  " please file a bug");
2785 
2786  gcp_map_type &GCMap = getGCMap(GCMetadataPrinters);
2787  gcp_map_type::iterator GCPI = GCMap.find(&S);
2788  if (GCPI != GCMap.end())
2789  return GCPI->second.get();
2790 
2791  auto Name = S.getName();
2792 
2795  E = GCMetadataPrinterRegistry::end(); I != E; ++I)
2796  if (Name == I->getName()) {
2797  std::unique_ptr<GCMetadataPrinter> GMP = I->instantiate();
2798  GMP->S = &S;
2799  auto IterBool = GCMap.insert(std::make_pair(&S, std::move(GMP)));
2800  return IterBool.first->second.get();
2801  }
2802 
2803  report_fatal_error("no GCMetadataPrinter registered for GC: " + Twine(Name));
2804 }
2805 
2806 /// Pin vtable to this file.
2808 
2810 
2811 // In the binary's "xray_instr_map" section, an array of these function entries
2812 // describes each instrumentation point. When XRay patches your code, the index
2813 // into this table will be given to your handler as a patch point identifier.
2815  const MCSymbol *CurrentFnSym) const {
2816  Out->EmitSymbolValue(Sled, Bytes);
2817  Out->EmitSymbolValue(CurrentFnSym, Bytes);
2818  auto Kind8 = static_cast<uint8_t>(Kind);
2819  Out->EmitBinaryData(StringRef(reinterpret_cast<const char *>(&Kind8), 1));
2820  Out->EmitBinaryData(
2821  StringRef(reinterpret_cast<const char *>(&AlwaysInstrument), 1));
2822  Out->EmitBinaryData(StringRef(reinterpret_cast<const char *>(&Version), 1));
2823  auto Padding = (4 * Bytes) - ((2 * Bytes) + 3);
2824  assert(Padding >= 0 && "Instrumentation map entry > 4 * Word Size");
2825  Out->EmitZeros(Padding);
2826 }
2827 
2829  if (Sleds.empty())
2830  return;
2831 
2832  auto PrevSection = OutStreamer->getCurrentSectionOnly();
2833  const Function &F = MF->getFunction();
2834  MCSection *InstMap = nullptr;
2835  MCSection *FnSledIndex = nullptr;
2837  auto Associated = dyn_cast<MCSymbolELF>(CurrentFnSym);
2838  assert(Associated != nullptr);
2840  std::string GroupName;
2841  if (F.hasComdat()) {
2842  Flags |= ELF::SHF_GROUP;
2843  GroupName = F.getComdat()->getName();
2844  }
2845 
2846  auto UniqueID = ++XRayFnUniqueID;
2847  InstMap =
2848  OutContext.getELFSection("xray_instr_map", ELF::SHT_PROGBITS, Flags, 0,
2849  GroupName, UniqueID, Associated);
2850  FnSledIndex =
2851  OutContext.getELFSection("xray_fn_idx", ELF::SHT_PROGBITS, Flags, 0,
2852  GroupName, UniqueID, Associated);
2853  } else if (MF->getSubtarget().getTargetTriple().isOSBinFormatMachO()) {
2854  InstMap = OutContext.getMachOSection("__DATA", "xray_instr_map", 0,
2856  FnSledIndex = OutContext.getMachOSection("__DATA", "xray_fn_idx", 0,
2858  } else {
2859  llvm_unreachable("Unsupported target");
2860  }
2861 
2862  auto WordSizeBytes = MAI->getCodePointerSize();
2863 
2864  // Now we switch to the instrumentation map section. Because this is done
2865  // per-function, we are able to create an index entry that will represent the
2866  // range of sleds associated with a function.
2867  MCSymbol *SledsStart = OutContext.createTempSymbol("xray_sleds_start", true);
2868  OutStreamer->SwitchSection(InstMap);
2869  OutStreamer->EmitLabel(SledsStart);
2870  for (const auto &Sled : Sleds)
2871  Sled.emit(WordSizeBytes, OutStreamer.get(), CurrentFnSym);
2872  MCSymbol *SledsEnd = OutContext.createTempSymbol("xray_sleds_end", true);
2873  OutStreamer->EmitLabel(SledsEnd);
2874 
2875  // We then emit a single entry in the index per function. We use the symbols
2876  // that bound the instrumentation map as the range for a specific function.
2877  // Each entry here will be 2 * word size aligned, as we're writing down two
2878  // pointers. This should work for both 32-bit and 64-bit platforms.
2879  OutStreamer->SwitchSection(FnSledIndex);
2880  OutStreamer->EmitCodeAlignment(2 * WordSizeBytes);
2881  OutStreamer->EmitSymbolValue(SledsStart, WordSizeBytes, false);
2882  OutStreamer->EmitSymbolValue(SledsEnd, WordSizeBytes, false);
2883  OutStreamer->SwitchSection(PrevSection);
2884  Sleds.clear();
2885 }
2886 
2888  SledKind Kind, uint8_t Version) {
2889  const Function &F = MI.getMF()->getFunction();
2890  auto Attr = F.getFnAttribute("function-instrument");
2891  bool LogArgs = F.hasFnAttribute("xray-log-args");
2892  bool AlwaysInstrument =
2893  Attr.isStringAttribute() && Attr.getValueAsString() == "xray-always";
2894  if (Kind == SledKind::FUNCTION_ENTER && LogArgs)
2895  Kind = SledKind::LOG_ARGS_ENTER;
2896  Sleds.emplace_back(XRayFunctionEntry{Sled, CurrentFnSym, Kind,
2897  AlwaysInstrument, &F, Version});
2898 }
2899 
2901  return OutStreamer->getContext().getDwarfVersion();
2902 }
2903 
2905  OutStreamer->getContext().setDwarfVersion(Version);
2906 }
virtual void EmitGlobalVariable(const GlobalVariable *GV)
Emit the specified global variable to the .s file.
Definition: AsmPrinter.cpp:418
const Function & getFunction() const
Definition: Function.h:134
void setDwarfVersion(uint16_t Version)
bool isDeclarationForLinker() const
Definition: GlobalValue.h:514
MachineConstantPoolValue * MachineCPVal
uint64_t CallInst * C
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:205
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:362
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)
constexpr char Align[]
Key for Kernel::Arg::Metadata::mAlign.
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...
const std::vector< MachineJumpTableEntry > & getJumpTables() const
bool isThreadData() const
Definition: SectionKind.h:154
bool hasLocalLinkage() const
Definition: GlobalValue.h:427
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
LLVMContext & Context
static void emitBasicBlockLoopComments(const MachineBasicBlock &MBB, const MachineLoopInfo *LI, const AsmPrinter &AP)
emitBasicBlockLoopComments - Pretty-print comments for basic blocks.
DiagnosticInfoOptimizationBase::Argument NV
unsigned XRayFnUniqueID
Definition: AsmPrinter.h:252
std::unique_ptr< MCStreamer > OutStreamer
This is the MCStreamer object for the file we are generating.
Definition: AsmPrinter.h:92
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:313
static const char *const DbgTimerDescription
Definition: AsmPrinter.cpp:130
MCTargetOptions MCOptions
Machine level options.
virtual MCSection * getStaticCtorSection(unsigned Priority, const MCSymbol *KeySym) const
bool hasPrivateLinkage() const
Definition: GlobalValue.h:426
const MachineFunction * getMF() const
Return the function that contains the basic block that this instruction belongs to.
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:115
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:127
bool isVariable() const
isVariable - Check if this is a variable symbol.
Definition: MCSymbol.h:295
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:2644
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:588
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:87
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
union llvm::MachineConstantPoolEntry::@138 Val
The constant itself.
bool canBeOmittedFromSymbolTable(const GlobalValue *GV)
True if GV can be left out of the object symbol table.
Definition: ObjectUtils.h:22
unsigned getLoopDepth() const
Return the nesting level of this loop.
Definition: LoopInfo.h:92
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:118
const MCSubtargetInfo & getSubtargetInfo() const
Return information about subtarget.
Definition: AsmPrinter.cpp:217
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:901
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:196
bool hasAvailableExternallyLinkage() const
Definition: GlobalValue.h:414
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:399
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:95
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:2300
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:125
bool hasPrologueData() const
Check whether this function has prologue data.
Definition: Function.h:652
bool isAbsolute() const
Is this an absolute (as opposed to relocatable) value.
Definition: MCValue.h:53
static const char *const DWARFGroupName
Definition: AsmPrinter.cpp:127
bool hasFnAttribute(Attribute::AttrKind Kind) const
Return true if the function has the attribute.
Definition: Function.h:262
A raw_ostream that writes to an SmallVector or SmallString.
Definition: raw_ostream.h:489
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:456
F(f)
setjmp/longjmp based exceptions
const MDOperand & getOperand(unsigned I) const
Definition: Metadata.h:1067
ELFYAML::ELF_STV Visibility
Definition: ELFYAML.cpp:735
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:506
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:114
static void emitKill(const MachineInstr *MI, AsmPrinter &AP)
Definition: AsmPrinter.cpp:797
static const char *const DWARFGroupDescription
Definition: AsmPrinter.cpp:128
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
DenseMap< GCStrategy *, std::unique_ptr< GCMetadataPrinter > > gcp_map_type
Definition: AsmPrinter.cpp:145
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:863
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:1279
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:541
bool hasSection() const
Definition: GlobalValue.h:261
AnalysisUsage & addRequired()
int64_t getConstant() const
Definition: MCValue.h:47
Used to lazily calculate structure layout information for a target machine, based on the DataLayout s...
Definition: DataLayout.h:491
void recordSled(MCSymbol *Sled, const MachineInstr &MI, SledKind Kind, uint8_t Version=0)
const MCSymbolRefExpr * getSymB() const
Definition: MCValue.h:49
MCSection * getStackSizesSection() const
virtual void EmitDebugThreadLocal(const MCExpr *Value, unsigned Size) const
Emit the directive and value for debug thread local expression.
Definition: AsmPrinter.cpp:616
static void emitGlobalConstantFP(const ConstantFP *CFP, AsmPrinter &AP)
A tuple of MDNodes.
Definition: Metadata.h:1323
bool hasPrefixData() const
Check whether this function has prefix data.
Definition: Function.h:643
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:1517
Definition: BitVector.h:920
Emits exception handling directives.
Definition: EHStreamer.h:31
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:366
Twine - A lightweight data structure for efficiently representing the concatenation of temporary valu...
Definition: Twine.h:81
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:355
const ConstantFP * getFPImm() const
unsigned getNumOperands() const
Access to explicit operands of the instruction.
Definition: MachineInstr.h:296
StringRef getRawDataValues() const
Return the raw, underlying, bytes of this data.
Definition: Constants.cpp:2274
Class to represent struct types.
Definition: DerivedTypes.h:201
This class is basically a combination of TimeRegion and Timer.
Definition: Timer.h:160
const TargetMachine & getTarget() const
getTarget - Return the target machine this machine code is compiled with
bool isKnownWindowsMSVCEnvironment() const
Checks if the environment is MSVC.
Definition: Triple.h:530
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:461
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...
bool hasVarSizedObjects() const
This method may be called any time after instruction selection is complete to determine if the stack ...
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:249
.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:431
INLINEASM - Represents an inline asm block.
Definition: ISDOpcodes.h:635
Constant * getPrefixData() const
Get the prefix data associated with this function.
Definition: Function.cpp:1269
BlockT * getHeader() const
Definition: LoopInfo.h:100
static const char *const CodeViewLineTablesGroupName
Definition: AsmPrinter.cpp:133
unsigned getPointerSize() const
Return the pointer size from the TargetMachine.
Definition: AsmPrinter.cpp:215
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:232
bool hasExternalLinkage() const
Definition: GlobalValue.h:413
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:976
static const MCBinaryExpr * createShl(const MCExpr *LHS, const MCExpr *RHS, MCContext &Ctx)
Definition: MCExpr.h:521
void getAnalysisUsage(AnalysisUsage &AU) const override
Record analysis usage.
Definition: AsmPrinter.cpp:231
Printable printReg(unsigned Reg, const TargetRegisterInfo *TRI=nullptr, unsigned SubRegIdx=0)
Prints virtual and physical registers with or without a TRI instance.
bool isNullValue() const
Return true if this is the value that would be returned by getNullValue.
Definition: Constants.cpp:85
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:991
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
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:536
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:1167
ConstantDataSequential - A vector or array constant whose element type is a simple 1/2/4/8-byte integ...
Definition: Constants.h:565
virtual void EmitBasicBlockEnd(const MachineBasicBlock &MBB)
Targets can override this to emit stuff at the end of a basic block.
bool isPositionIndependent() const
Definition: AsmPrinter.cpp:196
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:634
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:441
virtual void EmitBinaryData(StringRef Data)
Functionally identical to EmitBytes.
Definition: MCStreamer.cpp:916
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:97
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:451
bool hasLinkOnceLinkage() const
Definition: GlobalValue.h:417
bool isWindowsItaniumEnvironment() const
Definition: Triple.h:538
This file contains the declaration of the Comdat class, which represents a single COMDAT in LLVM...
bool isVerbose() const
Return true if assembly output should contain comments.
Definition: AsmPrinter.h:189
bool hasNoDeadStrip() const
Definition: MCAsmInfo.h:526
const std::string & str() const
Definition: Triple.h:354
Type * getElementType() const
Return the element type of the array/vector.
Definition: Constants.cpp:2270
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:98
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:360
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:424
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:562
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:814
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:406
void EmitZeros(uint64_t NumBytes)
Emit NumBytes worth of zeros.
Definition: MCStreamer.cpp:180
Streaming machine code generation interface.
Definition: MCStreamer.h:169
virtual void EmitFunctionBodyEnd()
Targets can override this to emit stuff after the last basic block in the function.
Definition: AsmPrinter.h:374
static const char *const EHTimerDescription
Definition: AsmPrinter.cpp:132
StringRef getName() const
Definition: Comdat.cpp:24
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...
CodeGenOpt::Level getOptLevel() const
Returns the optimization level: None, Less, Default, or Aggressive.
.weak_def_can_be_hidden (MachO)
Definition: MCDirectives.h:45
VisibilityTypes getVisibility() const
Definition: GlobalValue.h:225
MCSymbol * CurrentFnSym
The symbol for the current function.
Definition: AsmPrinter.h:105
bool getAsmPrinterFlag(CommentFlag Flag) const
Return whether an AsmPrinter flag is set.
Definition: MachineInstr.h:163
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:83
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:593
AsmPrinter(TargetMachine &TM, std::unique_ptr< MCStreamer > Streamer)
Definition: AsmPrinter.cpp:179
MachineFrameInfo & getFrameInfo()
getFrameInfo - Return the frame info object for the current function.
bool needsLocalForSize() const
Definition: MCAsmInfo.h:474
static GCRegistry::Add< CoreCLRGC > E("coreclr", "CoreCLR-compatible GC")
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...
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:371
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:516
unsigned getAlignment() const
Return alignment of the basic block.
unsigned EmitStackSizeSection
Emit section containing metadata on function stack sizes.
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:77
bool isCImm() const
isCImm - Test if this is a MO_CImmediate operand.
void getNameWithPrefix(SmallVectorImpl< char > &Name, const GlobalValue *GV) const
Definition: AsmPrinter.cpp:408
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:48
bool optForSize() const
Optimize this function for size (-Os) or minimum size (-Oz).
Definition: Function.h:530
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:352
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...
self_iterator getIterator()
Definition: ilist_node.h:82
~AsmPrinter() override
Definition: AsmPrinter.cpp:185
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:941
.weak_reference (MachO)
Definition: MCDirectives.h:44
bool isOSBinFormatMachO() const
Tests whether the environment is MachO.
Definition: Triple.h:598
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:131
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:558
Abstract base class for all machine specific constantpool value subclasses.
static void emitGlobalConstantVector(const DataLayout &DL, const ConstantVector *CV, AsmPrinter &AP)
auto find(R &&Range, const T &Val) -> decltype(adl_begin(Range))
Provide wrappers to std::find which take ranges instead of having to pass begin/end explicitly...
Definition: STLExtras.h:834
virtual MCSymbol * GetCPISymbol(unsigned CPID) const
Return the symbol for the specified constant pool entry.
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:3573
std::string & str()
Flushes the stream contents to the target string and returns the string&#39;s reference.
Definition: raw_ostream.h:478
#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:640
iterator_range< expr_op_iterator > expr_ops() const
bool hasWeakLinkage() const
Definition: GlobalValue.h:421
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:201
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:916
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:785
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:418
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
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:115
mmo_iterator memoperands_begin() const
Access to memory operands of the instruction.
Definition: MachineInstr.h:392
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:134
MCSymbol * getSymbol(const GlobalValue *GV) const
Definition: AsmPrinter.cpp:413
const MCSymbol & getSymbol() const
Definition: MCExpr.h:326
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:386
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:2563
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:571
Information about stack frame layout on the target.
const DataFlowGraph & G
Definition: RDFGraph.cpp:211
void EmitToStreamer(MCStreamer &S, const MCInst &Inst)
Definition: AsmPrinter.cpp:222
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
uint64_t getSizeInBytes() const
Definition: DataLayout.h:499
StringRef str()
Return a StringRef for the vector contents.
Definition: raw_ostream.h:514
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:192
MCSymbolAttr
Definition: MCDirectives.h:19
void print(raw_ostream &OS, bool isSigned) const
Definition: APInt.cpp:2143
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.
const Function & getFunction() const
Return the LLVM function that this machine code represents.
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:505
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
This file contains constants used for implementing Dwarf debug support.
Target - Wrapper for Target specific information.
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:462
virtual void EmitFunctionBodyStart()
Targets can override this to emit stuff before the first basic block in the function.
Definition: AsmPrinter.h:370
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:405
unsigned getNumElements() const
bool hasComdat() const
Definition: GlobalObject.h:100
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:2572
iterator end() const
Definition: GCMetadata.h:197
const MachineBasicBlock * getParent() const
Definition: MachineInstr.h:142
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
const Comdat * getComdat() const
Definition: GlobalObject.h:101
uint64_t getTypeAllocSize(Type *Ty) const
Returns the offset in bytes between successive objects of the specified type, including alignment pad...
Definition: DataLayout.h:403
LoopT * getParentLoop() const
Definition: LoopInfo.h:101
const std::vector< LoopT * > & getSubLoops() const
Return the loops contained entirely within this loop.
Definition: LoopInfo.h:131
Representation of each machine instruction.
Definition: MachineInstr.h:60
static void emitGlobalConstantImpl(const DataLayout &DL, const Constant *C, AsmPrinter &AP, const Constant *BaseCV=nullptr, uint64_t Offset=0)
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:240
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:513
SequentialType * getType() const
Specialize the getType() method to always return a SequentialType, which reduces the amount of castin...
Definition: Constants.h:624
StringRef filename(StringRef path, Style style=Style::native)
Get filename.
Definition: Path.cpp:576
.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:3468
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:439
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:220
TargetOptions Options
Definition: TargetMachine.h:96
virtual ~AsmPrinterHandler()
Pin vtable to this file.
const NodeList & List
Definition: RDFGraph.cpp:210
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
#define N
bool hasInlineAsm() const
Returns true if the function contains any inline assembly.
bool isDefined(bool SetUsed=true) const
isDefined - Check if this symbol is defined (i.e., it has an address).
Definition: MCSymbol.h:249
static bool emitComments(const MachineInstr &MI, raw_ostream &CommentOS, AsmPrinter *AP)
emitComments - Pretty-print comments for instructions.
Definition: AsmPrinter.cpp:727
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:147
static const MCBinaryExpr * createMod(const MCExpr *LHS, const MCExpr *RHS, MCContext &Ctx)
Definition: MCExpr.h:501
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:156
virtual void EmitFunctionEntryLabel()
EmitFunctionEntryLabel - Emit the label that is the entrypoint for the function.
Definition: AsmPrinter.cpp:709
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:256
bool isDeclaration() const
Return true if the primary definition of this global value is outside of the current translation unit...
Definition: Globals.cpp:201
bool empty() const
Definition: LoopInfo.h:146
StringRef getName() const
getName - Get the symbol name.
Definition: MCSymbol.h:203
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:462
MCSectionELF * getELFSection(const Twine &Section, unsigned Type, unsigned Flags)
Definition: MCContext.h:379
MCSymbol * getMCSymbol() const
void EmitGlobalConstant(const DataLayout &DL, const Constant *CV)
Print a general LLVM constant to the .s file.
Module * getParent()
Get the module that this global value is contained inside of...
Definition: GlobalValue.h:556
LLVM Value Representation.
Definition: Value.h:73
Constant * getPersonalityFn() const
Get the personality function associated with this function.
Definition: Function.cpp:1259
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:386
bool isThreadLocal() const
Definition: SectionKind.h:149
bool hasInitializer() const
Definitions have initializers, declarations don&#39;t.
constexpr char Size[]
Key for Kernel::Arg::Metadata::mSize.
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:129
#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:270
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:57
uint64_t getTypeAllocSizeInBits(Type *Ty) const
Returns the offset in bits between successive objects of the specified type, including alignment padd...
Definition: DataLayout.h:413
MCSymbol * CurrentFnSymForSize
The symbol used to represent the start of the current function for the purpose of calculating its siz...
Definition: AsmPrinter.h:110
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:209
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:238
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:101
bool hasOneUse() const
Return true if there is exactly one user of this value.
Definition: Value.h:418
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...
void setAsmPrinterFlag(uint8_t Flag)
Set a flag for the AsmPrinter.
Definition: MachineInstr.h:168
unsigned getNumElements() const
Return the number of elements in the array or vector.
Definition: Constants.cpp:2293
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:25
bool isBigEndian() const
Definition: DataLayout.h:217
const MCSection * getCurrentSection() const
Return the current section we are emitting to.
Definition: AsmPrinter.cpp:227
unsigned getOpcode() const
Definition: MCInst.h:172
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:298
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
uint64_t getStackSize() const
Return the number of bytes that must be allocated to hold all of the fixed size frame objects...
const uint64_t Version
Definition: InstrProf.h:867
void emitStackSizeSection(const MachineFunction &MF)
Definition: AsmPrinter.cpp:951
bool use_empty() const
Definition: Value.h:328
#define OP(n)
Definition: regex2.h:73
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:265
.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:391
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:2652
MCSubtargetInfo & getSubtargetCopy(const MCSubtargetInfo &STI)
Definition: MCContext.cpp:525