LLVM  7.0.0svn
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 "WinCFGuard.h"
20 #include "WinException.h"
21 #include "llvm/ADT/APFloat.h"
22 #include "llvm/ADT/APInt.h"
23 #include "llvm/ADT/DenseMap.h"
24 #include "llvm/ADT/STLExtras.h"
25 #include "llvm/ADT/SmallPtrSet.h"
26 #include "llvm/ADT/SmallString.h"
27 #include "llvm/ADT/SmallVector.h"
28 #include "llvm/ADT/Statistic.h"
29 #include "llvm/ADT/StringRef.h"
30 #include "llvm/ADT/Triple.h"
31 #include "llvm/ADT/Twine.h"
37 #include "llvm/BinaryFormat/ELF.h"
62 #include "llvm/IR/BasicBlock.h"
63 #include "llvm/IR/Comdat.h"
64 #include "llvm/IR/Constant.h"
65 #include "llvm/IR/Constants.h"
66 #include "llvm/IR/DataLayout.h"
68 #include "llvm/IR/DerivedTypes.h"
69 #include "llvm/IR/Function.h"
70 #include "llvm/IR/GlobalAlias.h"
71 #include "llvm/IR/GlobalIFunc.h"
73 #include "llvm/IR/GlobalObject.h"
74 #include "llvm/IR/GlobalValue.h"
75 #include "llvm/IR/GlobalVariable.h"
76 #include "llvm/IR/Instruction.h"
77 #include "llvm/IR/Mangler.h"
78 #include "llvm/IR/Metadata.h"
79 #include "llvm/IR/Module.h"
80 #include "llvm/IR/Operator.h"
81 #include "llvm/IR/Type.h"
82 #include "llvm/IR/Value.h"
83 #include "llvm/MC/MCAsmInfo.h"
84 #include "llvm/MC/MCCodePadder.h"
85 #include "llvm/MC/MCContext.h"
86 #include "llvm/MC/MCDirectives.h"
87 #include "llvm/MC/MCDwarf.h"
88 #include "llvm/MC/MCExpr.h"
89 #include "llvm/MC/MCInst.h"
90 #include "llvm/MC/MCSection.h"
91 #include "llvm/MC/MCSectionELF.h"
92 #include "llvm/MC/MCSectionMachO.h"
93 #include "llvm/MC/MCStreamer.h"
95 #include "llvm/MC/MCSymbol.h"
96 #include "llvm/MC/MCSymbolELF.h"
98 #include "llvm/MC/MCValue.h"
99 #include "llvm/MC/SectionKind.h"
100 #include "llvm/Pass.h"
101 #include "llvm/Support/Casting.h"
103 #include "llvm/Support/Compiler.h"
105 #include "llvm/Support/Format.h"
106 #include "llvm/Support/MathExtras.h"
107 #include "llvm/Support/Path.h"
109 #include "llvm/Support/Timer.h"
113 #include <algorithm>
114 #include <cassert>
115 #include <cinttypes>
116 #include <cstdint>
117 #include <iterator>
118 #include <limits>
119 #include <memory>
120 #include <string>
121 #include <utility>
122 #include <vector>
123 
124 using namespace llvm;
125 
126 #define DEBUG_TYPE "asm-printer"
127 
128 static const char *const DWARFGroupName = "dwarf";
129 static const char *const DWARFGroupDescription = "DWARF Emission";
130 static const char *const DbgTimerName = "emit";
131 static const char *const DbgTimerDescription = "Debug Info Emission";
132 static const char *const EHTimerName = "write_exception";
133 static const char *const EHTimerDescription = "DWARF Exception Writer";
134 static const char *const CFGuardName = "Control Flow Guard";
135 static const char *const CFGuardDescription = "Control Flow Guard Tables";
136 static const char *const CodeViewLineTablesGroupName = "linetables";
137 static const char *const CodeViewLineTablesGroupDescription =
138  "CodeView Line Tables";
139 
140 STATISTIC(EmittedInsts, "Number of machine instrs printed");
141 
142 static cl::opt<bool>
143  PrintSchedule("print-schedule", cl::Hidden, cl::init(false),
144  cl::desc("Print 'sched: [latency:throughput]' in .s output"));
145 
146 char AsmPrinter::ID = 0;
147 
149 
150 static gcp_map_type &getGCMap(void *&P) {
151  if (!P)
152  P = new gcp_map_type();
153  return *(gcp_map_type*)P;
154 }
155 
156 /// getGVAlignmentLog2 - Return the alignment to use for the specified global
157 /// value in log2 form. This rounds up to the preferred alignment if possible
158 /// and legal.
159 static unsigned getGVAlignmentLog2(const GlobalValue *GV, const DataLayout &DL,
160  unsigned InBits = 0) {
161  unsigned NumBits = 0;
162  if (const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV))
163  NumBits = DL.getPreferredAlignmentLog(GVar);
164 
165  // If InBits is specified, round it to it.
166  if (InBits > NumBits)
167  NumBits = InBits;
168 
169  // If the GV has a specified alignment, take it into account.
170  if (GV->getAlignment() == 0)
171  return NumBits;
172 
173  unsigned GVAlign = Log2_32(GV->getAlignment());
174 
175  // If the GVAlign is larger than NumBits, or if we are required to obey
176  // NumBits because the GV has an assigned section, obey it.
177  if (GVAlign > NumBits || GV->hasSection())
178  NumBits = GVAlign;
179  return NumBits;
180 }
181 
182 AsmPrinter::AsmPrinter(TargetMachine &tm, std::unique_ptr<MCStreamer> Streamer)
183  : MachineFunctionPass(ID), TM(tm), MAI(tm.getMCAsmInfo()),
184  OutContext(Streamer->getContext()), OutStreamer(std::move(Streamer)) {
185  VerboseAsm = OutStreamer->isVerboseAsm();
186 }
187 
189  assert(!DD && Handlers.empty() && "Debug/EH info didn't get finalized");
190 
191  if (GCMetadataPrinters) {
192  gcp_map_type &GCMap = getGCMap(GCMetadataPrinters);
193 
194  delete &GCMap;
195  GCMetadataPrinters = nullptr;
196  }
197 }
198 
200  return TM.isPositionIndependent();
201 }
202 
203 /// getFunctionNumber - Return a unique ID for the current function.
205  return MF->getFunctionNumber();
206 }
207 
209  return *TM.getObjFileLowering();
210 }
211 
213  return MMI->getModule()->getDataLayout();
214 }
215 
216 // Do not use the cached DataLayout because some client use it without a Module
217 // (llvm-dsymutil, llvm-dwarfdump).
218 unsigned AsmPrinter::getPointerSize() const { return TM.getPointerSize(); }
219 
221  assert(MF && "getSubtargetInfo requires a valid MachineFunction!");
222  return MF->getSubtarget<MCSubtargetInfo>();
223 }
224 
227 }
228 
229 /// getCurrentSection() - Return the current section we are emitting to.
231  return OutStreamer->getCurrentSectionOnly();
232 }
233 
235  AU.setPreservesAll();
241 }
242 
244  MMI = getAnalysisIfAvailable<MachineModuleInfo>();
245 
246  // Initialize TargetLoweringObjectFile.
248  .Initialize(OutContext, TM);
249 
250  OutStreamer->InitSections(false);
251 
252  // Emit the version-min deplyment target directive if needed.
253  //
254  // FIXME: If we end up with a collection of these sorts of Darwin-specific
255  // or ELF-specific things, it may make sense to have a platform helper class
256  // that will work with the target helper class. For now keep it here, as the
257  // alternative is duplicated code in each of the target asm printers that
258  // use the directive, where it would need the same conditionalization
259  // anyway.
260  const Triple &Target = TM.getTargetTriple();
261  OutStreamer->EmitVersionForTarget(Target);
262 
263  // Allow the target to emit any magic that it wants at the start of the file.
265 
266  // Very minimal debug info. It is ignored if we emit actual debug info. If we
267  // don't, this at least helps the user find where a global came from.
269  // .file "foo.c"
270  OutStreamer->EmitFileDirective(
272  }
273 
274  GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
275  assert(MI && "AsmPrinter didn't require GCModuleInfo?");
276  for (auto &I : *MI)
277  if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I))
278  MP->beginAssembly(M, *MI, *this);
279 
280  // Emit module-level inline asm if it exists.
281  if (!M.getModuleInlineAsm().empty()) {
282  // We're at the module level. Construct MCSubtarget from the default CPU
283  // and target triple.
284  std::unique_ptr<MCSubtargetInfo> STI(TM.getTarget().createMCSubtargetInfo(
287  OutStreamer->AddComment("Start of file scope inline assembly");
288  OutStreamer->AddBlankLine();
289  EmitInlineAsm(M.getModuleInlineAsm()+"\n",
291  OutStreamer->AddComment("End of file scope inline assembly");
292  OutStreamer->AddBlankLine();
293  }
294 
296  bool EmitCodeView = MMI->getModule()->getCodeViewFlag();
297  if (EmitCodeView && (TM.getTargetTriple().isKnownWindowsMSVCEnvironment() ||
299  Handlers.push_back(HandlerInfo(new CodeViewDebug(this),
300  DbgTimerName, DbgTimerDescription,
301  CodeViewLineTablesGroupName,
302  CodeViewLineTablesGroupDescription));
303  }
304  if (!EmitCodeView || MMI->getModule()->getDwarfVersion()) {
305  DD = new DwarfDebug(this, &M);
306  DD->beginModule();
307  Handlers.push_back(HandlerInfo(DD, DbgTimerName, DbgTimerDescription,
308  DWARFGroupName, DWARFGroupDescription));
309  }
310  }
311 
312  switch (MAI->getExceptionHandlingType()) {
316  isCFIMoveForDebugging = true;
318  break;
319  for (auto &F: M.getFunctionList()) {
320  // If the module contains any function with unwind data,
321  // .eh_frame has to be emitted.
322  // Ignore functions that won't get emitted.
323  if (!F.isDeclarationForLinker() && F.needsUnwindTableEntry()) {
324  isCFIMoveForDebugging = false;
325  break;
326  }
327  }
328  break;
329  default:
330  isCFIMoveForDebugging = false;
331  break;
332  }
333 
334  EHStreamer *ES = nullptr;
335  switch (MAI->getExceptionHandlingType()) {
337  break;
340  ES = new DwarfCFIException(this);
341  break;
343  ES = new ARMException(this);
344  break;
346  switch (MAI->getWinEHEncodingType()) {
347  default: llvm_unreachable("unsupported unwinding information encoding");
349  break;
352  ES = new WinException(this);
353  break;
354  }
355  break;
356  }
357  if (ES)
358  Handlers.push_back(HandlerInfo(ES, EHTimerName, EHTimerDescription,
359  DWARFGroupName, DWARFGroupDescription));
360 
361  if (mdconst::extract_or_null<ConstantInt>(
362  MMI->getModule()->getModuleFlag("cfguard")))
363  Handlers.push_back(HandlerInfo(new WinCFGuard(this), CFGuardName,
364  CFGuardDescription, DWARFGroupName,
365  DWARFGroupDescription));
366 
367  return false;
368 }
369 
370 static bool canBeHidden(const GlobalValue *GV, const MCAsmInfo &MAI) {
372  return false;
373 
374  return canBeOmittedFromSymbolTable(GV);
375 }
376 
377 void AsmPrinter::EmitLinkage(const GlobalValue *GV, MCSymbol *GVSym) const {
378  GlobalValue::LinkageTypes Linkage = GV->getLinkage();
379  switch (Linkage) {
385  if (MAI->hasWeakDefDirective()) {
386  // .globl _foo
387  OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Global);
388 
389  if (!canBeHidden(GV, *MAI))
390  // .weak_definition _foo
391  OutStreamer->EmitSymbolAttribute(GVSym, MCSA_WeakDefinition);
392  else
393  OutStreamer->EmitSymbolAttribute(GVSym, MCSA_WeakDefAutoPrivate);
394  } else if (MAI->hasLinkOnceDirective()) {
395  // .globl _foo
396  OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Global);
397  //NOTE: linkonce is handled by the section the symbol was assigned to.
398  } else {
399  // .weak _foo
400  OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Weak);
401  }
402  return;
404  // If external, declare as a global symbol: .globl _foo
405  OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Global);
406  return;
409  return;
413  llvm_unreachable("Should never emit this");
414  }
415  llvm_unreachable("Unknown linkage type!");
416 }
417 
419  const GlobalValue *GV) const {
420  TM.getNameWithPrefix(Name, GV, getObjFileLowering().getMangler());
421 }
422 
424  return TM.getSymbol(GV);
425 }
426 
427 /// EmitGlobalVariable - Emit the specified global variable to the .s file.
429  bool IsEmuTLSVar = TM.Options.EmulatedTLS && GV->isThreadLocal();
430  assert(!(IsEmuTLSVar && GV->hasCommonLinkage()) &&
431  "No emulated TLS variables in the common section");
432 
433  // Never emit TLS variable xyz in emulated TLS model.
434  // The initialization value is in __emutls_t.xyz instead of xyz.
435  if (IsEmuTLSVar)
436  return;
437 
438  if (GV->hasInitializer()) {
439  // Check to see if this is a special global used by LLVM, if so, emit it.
440  if (EmitSpecialLLVMGlobal(GV))
441  return;
442 
443  // Skip the emission of global equivalents. The symbol can be emitted later
444  // on by emitGlobalGOTEquivs in case it turns out to be needed.
445  if (GlobalGOTEquivs.count(getSymbol(GV)))
446  return;
447 
448  if (isVerbose()) {
449  // When printing the control variable __emutls_v.*,
450  // we don't need to print the original TLS variable name.
451  GV->printAsOperand(OutStreamer->GetCommentOS(),
452  /*PrintType=*/false, GV->getParent());
453  OutStreamer->GetCommentOS() << '\n';
454  }
455  }
456 
457  MCSymbol *GVSym = getSymbol(GV);
458  MCSymbol *EmittedSym = GVSym;
459 
460  // getOrCreateEmuTLSControlSym only creates the symbol with name and default
461  // attributes.
462  // GV's or GVSym's attributes will be used for the EmittedSym.
463  EmitVisibility(EmittedSym, GV->getVisibility(), !GV->isDeclaration());
464 
465  if (!GV->hasInitializer()) // External globals require no extra code.
466  return;
467 
468  GVSym->redefineIfPossible();
469  if (GVSym->isDefined() || GVSym->isVariable())
470  report_fatal_error("symbol '" + Twine(GVSym->getName()) +
471  "' is already defined");
472 
474  OutStreamer->EmitSymbolAttribute(EmittedSym, MCSA_ELF_TypeObject);
475 
477 
478  const DataLayout &DL = GV->getParent()->getDataLayout();
479  uint64_t Size = DL.getTypeAllocSize(GV->getType()->getElementType());
480 
481  // If the alignment is specified, we *must* obey it. Overaligning a global
482  // with a specified alignment is a prompt way to break globals emitted to
483  // sections and expected to be contiguous (e.g. ObjC metadata).
484  unsigned AlignLog = getGVAlignmentLog2(GV, DL);
485 
486  for (const HandlerInfo &HI : Handlers) {
487  NamedRegionTimer T(HI.TimerName, HI.TimerDescription,
488  HI.TimerGroupName, HI.TimerGroupDescription,
490  HI.Handler->setSymbolSize(GVSym, Size);
491  }
492 
493  // Handle common symbols
494  if (GVKind.isCommon()) {
495  if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
496  unsigned Align = 1 << AlignLog;
498  Align = 0;
499 
500  // .comm _foo, 42, 4
501  OutStreamer->EmitCommonSymbol(GVSym, Size, Align);
502  return;
503  }
504 
505  // Determine to which section this global should be emitted.
506  MCSection *TheSection = getObjFileLowering().SectionForGlobal(GV, GVKind, TM);
507 
508  // If we have a bss global going to a section that supports the
509  // zerofill directive, do so here.
510  if (GVKind.isBSS() && MAI->hasMachoZeroFillDirective() &&
511  TheSection->isVirtualSection()) {
512  if (Size == 0)
513  Size = 1; // zerofill of 0 bytes is undefined.
514  unsigned Align = 1 << AlignLog;
515  EmitLinkage(GV, GVSym);
516  // .zerofill __DATA, __bss, _foo, 400, 5
517  OutStreamer->EmitZerofill(TheSection, GVSym, Size, Align);
518  return;
519  }
520 
521  // If this is a BSS local symbol and we are emitting in the BSS
522  // section use .lcomm/.comm directive.
523  if (GVKind.isBSSLocal() &&
524  getObjFileLowering().getBSSSection() == TheSection) {
525  if (Size == 0)
526  Size = 1; // .comm Foo, 0 is undefined, avoid it.
527  unsigned Align = 1 << AlignLog;
528 
529  // Use .lcomm only if it supports user-specified alignment.
530  // Otherwise, while it would still be correct to use .lcomm in some
531  // cases (e.g. when Align == 1), the external assembler might enfore
532  // some -unknown- default alignment behavior, which could cause
533  // spurious differences between external and integrated assembler.
534  // Prefer to simply fall back to .local / .comm in this case.
536  // .lcomm _foo, 42
537  OutStreamer->EmitLocalCommonSymbol(GVSym, Size, Align);
538  return;
539  }
540 
541  if (!getObjFileLowering().getCommDirectiveSupportsAlignment())
542  Align = 0;
543 
544  // .local _foo
545  OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Local);
546  // .comm _foo, 42, 4
547  OutStreamer->EmitCommonSymbol(GVSym, Size, Align);
548  return;
549  }
550 
551  // Handle thread local data for mach-o which requires us to output an
552  // additional structure of data and mangle the original symbol so that we
553  // can reference it later.
554  //
555  // TODO: This should become an "emit thread local global" method on TLOF.
556  // All of this macho specific stuff should be sunk down into TLOFMachO and
557  // stuff like "TLSExtraDataSection" should no longer be part of the parent
558  // TLOF class. This will also make it more obvious that stuff like
559  // MCStreamer::EmitTBSSSymbol is macho specific and only called from macho
560  // specific code.
561  if (GVKind.isThreadLocal() && MAI->hasMachoTBSSDirective()) {
562  // Emit the .tbss symbol
563  MCSymbol *MangSym =
564  OutContext.getOrCreateSymbol(GVSym->getName() + Twine("$tlv$init"));
565 
566  if (GVKind.isThreadBSS()) {
567  TheSection = getObjFileLowering().getTLSBSSSection();
568  OutStreamer->EmitTBSSSymbol(TheSection, MangSym, Size, 1 << AlignLog);
569  } else if (GVKind.isThreadData()) {
570  OutStreamer->SwitchSection(TheSection);
571 
572  EmitAlignment(AlignLog, GV);
573  OutStreamer->EmitLabel(MangSym);
574 
576  GV->getInitializer());
577  }
578 
579  OutStreamer->AddBlankLine();
580 
581  // Emit the variable struct for the runtime.
583 
584  OutStreamer->SwitchSection(TLVSect);
585  // Emit the linkage here.
586  EmitLinkage(GV, GVSym);
587  OutStreamer->EmitLabel(GVSym);
588 
589  // Three pointers in size:
590  // - __tlv_bootstrap - used to make sure support exists
591  // - spare pointer, used when mapped by the runtime
592  // - pointer to mangled symbol above with initializer
593  unsigned PtrSize = DL.getPointerTypeSize(GV->getType());
594  OutStreamer->EmitSymbolValue(GetExternalSymbolSymbol("_tlv_bootstrap"),
595  PtrSize);
596  OutStreamer->EmitIntValue(0, PtrSize);
597  OutStreamer->EmitSymbolValue(MangSym, PtrSize);
598 
599  OutStreamer->AddBlankLine();
600  return;
601  }
602 
603  MCSymbol *EmittedInitSym = GVSym;
604 
605  OutStreamer->SwitchSection(TheSection);
606 
607  EmitLinkage(GV, EmittedInitSym);
608  EmitAlignment(AlignLog, GV);
609 
610  OutStreamer->EmitLabel(EmittedInitSym);
611 
613 
615  // .size foo, 42
616  OutStreamer->emitELFSize(EmittedInitSym,
618 
619  OutStreamer->AddBlankLine();
620 }
621 
622 /// Emit the directive and value for debug thread local expression
623 ///
624 /// \p Value - The value to emit.
625 /// \p Size - The size of the integer (in bytes) to emit.
627  unsigned Size) const {
628  OutStreamer->EmitValue(Value, Size);
629 }
630 
631 /// EmitFunctionHeader - This method emits the header for the current
632 /// function.
633 void AsmPrinter::EmitFunctionHeader() {
634  const Function &F = MF->getFunction();
635 
636  if (isVerbose())
637  OutStreamer->GetCommentOS()
638  << "-- Begin function "
640 
641  // Print out constants referenced by the function
643 
644  // Print the 'header' of function.
645  OutStreamer->SwitchSection(getObjFileLowering().SectionForGlobal(&F, TM));
646  EmitVisibility(CurrentFnSym, F.getVisibility());
647 
648  EmitLinkage(&F, CurrentFnSym);
649  if (MAI->hasFunctionAlignment())
651 
653  OutStreamer->EmitSymbolAttribute(CurrentFnSym, MCSA_ELF_TypeFunction);
654 
655  if (isVerbose()) {
656  F.printAsOperand(OutStreamer->GetCommentOS(),
657  /*PrintType=*/false, F.getParent());
658  OutStreamer->GetCommentOS() << '\n';
659  }
660 
661  // Emit the prefix data.
662  if (F.hasPrefixData()) {
663  if (MAI->hasSubsectionsViaSymbols()) {
664  // Preserving prefix data on platforms which use subsections-via-symbols
665  // is a bit tricky. Here we introduce a symbol for the prefix data
666  // and use the .alt_entry attribute to mark the function's real entry point
667  // as an alternative entry point to the prefix-data symbol.
669  OutStreamer->EmitLabel(PrefixSym);
670 
672 
673  // Emit an .alt_entry directive for the actual function symbol.
674  OutStreamer->EmitSymbolAttribute(CurrentFnSym, MCSA_AltEntry);
675  } else {
677  }
678  }
679 
680  // Emit the CurrentFnSym. This is a virtual function to allow targets to
681  // do their wild and crazy things as required.
683 
684  // If the function had address-taken blocks that got deleted, then we have
685  // references to the dangling symbols. Emit them at the start of the function
686  // so that we don't get references to undefined symbols.
687  std::vector<MCSymbol*> DeadBlockSyms;
688  MMI->takeDeletedSymbolsForFunction(&F, DeadBlockSyms);
689  for (unsigned i = 0, e = DeadBlockSyms.size(); i != e; ++i) {
690  OutStreamer->AddComment("Address taken block that was later removed");
691  OutStreamer->EmitLabel(DeadBlockSyms[i]);
692  }
693 
694  if (CurrentFnBegin) {
695  if (MAI->useAssignmentForEHBegin()) {
697  OutStreamer->EmitLabel(CurPos);
698  OutStreamer->EmitAssignment(CurrentFnBegin,
700  } else {
701  OutStreamer->EmitLabel(CurrentFnBegin);
702  }
703  }
704 
705  // Emit pre-function debug and/or EH information.
706  for (const HandlerInfo &HI : Handlers) {
707  NamedRegionTimer T(HI.TimerName, HI.TimerDescription, HI.TimerGroupName,
708  HI.TimerGroupDescription, TimePassesIsEnabled);
709  HI.Handler->beginFunction(MF);
710  }
711 
712  // Emit the prologue data.
713  if (F.hasPrologueData())
715 }
716 
717 /// EmitFunctionEntryLabel - Emit the label that is the entrypoint for the
718 /// function. This can be overridden by targets as required to do custom stuff.
721 
722  // The function label could have already been emitted if two symbols end up
723  // conflicting due to asm renaming. Detect this and emit an error.
724  if (CurrentFnSym->isVariable())
726  "' is a protected alias");
727  if (CurrentFnSym->isDefined())
729  "' label emitted multiple times to assembly file");
730 
731  return OutStreamer->EmitLabel(CurrentFnSym);
732 }
733 
734 /// emitComments - Pretty-print comments for instructions.
735 /// It returns true iff the sched comment was emitted.
736 /// Otherwise it returns false.
737 static bool emitComments(const MachineInstr &MI, raw_ostream &CommentOS,
738  AsmPrinter *AP) {
739  const MachineFunction *MF = MI.getMF();
740  const TargetInstrInfo *TII = MF->getSubtarget().getInstrInfo();
741 
742  // Check for spills and reloads
743  int FI;
744 
745  const MachineFrameInfo &MFI = MF->getFrameInfo();
746  bool Commented = false;
747 
748  // We assume a single instruction only has a spill or reload, not
749  // both.
750  const MachineMemOperand *MMO;
751  if (TII->isLoadFromStackSlotPostFE(MI, FI)) {
752  if (MFI.isSpillSlotObjectIndex(FI)) {
753  MMO = *MI.memoperands_begin();
754  CommentOS << MMO->getSize() << "-byte Reload";
755  Commented = true;
756  }
757  } else if (TII->hasLoadFromStackSlot(MI, MMO, FI)) {
758  if (MFI.isSpillSlotObjectIndex(FI)) {
759  CommentOS << MMO->getSize() << "-byte Folded Reload";
760  Commented = true;
761  }
762  } else if (TII->isStoreToStackSlotPostFE(MI, FI)) {
763  if (MFI.isSpillSlotObjectIndex(FI)) {
764  MMO = *MI.memoperands_begin();
765  CommentOS << MMO->getSize() << "-byte Spill";
766  Commented = true;
767  }
768  } else if (TII->hasStoreToStackSlot(MI, MMO, FI)) {
769  if (MFI.isSpillSlotObjectIndex(FI)) {
770  CommentOS << MMO->getSize() << "-byte Folded Spill";
771  Commented = true;
772  }
773  }
774 
775  // Check for spill-induced copies
777  Commented = true;
778  CommentOS << " Reload Reuse";
779  }
780 
781  if (Commented) {
782  if (AP->EnablePrintSchedInfo) {
783  // If any comment was added above and we need sched info comment then add
784  // this new comment just after the above comment w/o "\n" between them.
785  CommentOS << " " << MF->getSubtarget().getSchedInfoStr(MI) << "\n";
786  return true;
787  }
788  CommentOS << "\n";
789  }
790  return false;
791 }
792 
793 /// emitImplicitDef - This method emits the specified machine instruction
794 /// that is an implicit def.
796  unsigned RegNo = MI->getOperand(0).getReg();
797 
798  SmallString<128> Str;
799  raw_svector_ostream OS(Str);
800  OS << "implicit-def: "
801  << printReg(RegNo, MF->getSubtarget().getRegisterInfo());
802 
803  OutStreamer->AddComment(OS.str());
804  OutStreamer->AddBlankLine();
805 }
806 
807 static void emitKill(const MachineInstr *MI, AsmPrinter &AP) {
808  std::string Str;
809  raw_string_ostream OS(Str);
810  OS << "kill:";
811  for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
812  const MachineOperand &Op = MI->getOperand(i);
813  assert(Op.isReg() && "KILL instruction must have only register operands");
814  OS << ' ' << (Op.isDef() ? "def " : "killed ")
815  << printReg(Op.getReg(), AP.MF->getSubtarget().getRegisterInfo());
816  }
817  AP.OutStreamer->AddComment(OS.str());
818  AP.OutStreamer->AddBlankLine();
819 }
820 
821 /// emitDebugValueComment - This method handles the target-independent form
822 /// of DBG_VALUE, returning true if it was able to do so. A false return
823 /// means the target will need to handle MI in EmitInstruction.
825  // This code handles only the 4-operand target-independent form.
826  if (MI->getNumOperands() != 4)
827  return false;
828 
829  SmallString<128> Str;
830  raw_svector_ostream OS(Str);
831  OS << "DEBUG_VALUE: ";
832 
833  const DILocalVariable *V = MI->getDebugVariable();
834  if (auto *SP = dyn_cast<DISubprogram>(V->getScope())) {
835  StringRef Name = SP->getName();
836  if (!Name.empty())
837  OS << Name << ":";
838  }
839  OS << V->getName();
840  OS << " <- ";
841 
842  // The second operand is only an offset if it's an immediate.
843  bool MemLoc = MI->getOperand(0).isReg() && MI->getOperand(1).isImm();
844  int64_t Offset = MemLoc ? MI->getOperand(1).getImm() : 0;
845  const DIExpression *Expr = MI->getDebugExpression();
846  if (Expr->getNumElements()) {
847  OS << '[';
848  bool NeedSep = false;
849  for (auto Op : Expr->expr_ops()) {
850  if (NeedSep)
851  OS << ", ";
852  else
853  NeedSep = true;
854  OS << dwarf::OperationEncodingString(Op.getOp());
855  for (unsigned I = 0; I < Op.getNumArgs(); ++I)
856  OS << ' ' << Op.getArg(I);
857  }
858  OS << "] ";
859  }
860 
861  // Register or immediate value. Register 0 means undef.
862  if (MI->getOperand(0).isFPImm()) {
863  APFloat APF = APFloat(MI->getOperand(0).getFPImm()->getValueAPF());
864  if (MI->getOperand(0).getFPImm()->getType()->isFloatTy()) {
865  OS << (double)APF.convertToFloat();
866  } else if (MI->getOperand(0).getFPImm()->getType()->isDoubleTy()) {
867  OS << APF.convertToDouble();
868  } else {
869  // There is no good way to print long double. Convert a copy to
870  // double. Ah well, it's only a comment.
871  bool ignored;
873  &ignored);
874  OS << "(long double) " << APF.convertToDouble();
875  }
876  } else if (MI->getOperand(0).isImm()) {
877  OS << MI->getOperand(0).getImm();
878  } else if (MI->getOperand(0).isCImm()) {
879  MI->getOperand(0).getCImm()->getValue().print(OS, false /*isSigned*/);
880  } else {
881  unsigned Reg;
882  if (MI->getOperand(0).isReg()) {
883  Reg = MI->getOperand(0).getReg();
884  } else {
885  assert(MI->getOperand(0).isFI() && "Unknown operand type");
887  Offset += TFI->getFrameIndexReference(*AP.MF,
888  MI->getOperand(0).getIndex(), Reg);
889  MemLoc = true;
890  }
891  if (Reg == 0) {
892  // Suppress offset, it is not meaningful here.
893  OS << "undef";
894  // NOTE: Want this comment at start of line, don't emit with AddComment.
895  AP.OutStreamer->emitRawComment(OS.str());
896  return true;
897  }
898  if (MemLoc)
899  OS << '[';
900  OS << printReg(Reg, AP.MF->getSubtarget().getRegisterInfo());
901  }
902 
903  if (MemLoc)
904  OS << '+' << Offset << ']';
905 
906  // NOTE: Want this comment at start of line, don't emit with AddComment.
907  AP.OutStreamer->emitRawComment(OS.str());
908  return true;
909 }
910 
914  return CFI_M_EH;
915 
916  if (MMI->hasDebugInfo())
917  return CFI_M_Debug;
918 
919  return CFI_M_None;
920 }
921 
924 }
925 
927  ExceptionHandling ExceptionHandlingType = MAI->getExceptionHandlingType();
928  if (ExceptionHandlingType != ExceptionHandling::DwarfCFI &&
929  ExceptionHandlingType != ExceptionHandling::ARM)
930  return;
931 
932  if (needsCFIMoves() == CFI_M_None)
933  return;
934 
935  // If there is no "real" instruction following this CFI instruction, skip
936  // emitting it; it would be beyond the end of the function's FDE range.
937  auto *MBB = MI.getParent();
938  auto I = std::next(MI.getIterator());
939  while (I != MBB->end() && I->isTransient())
940  ++I;
941  if (I == MBB->instr_end() &&
942  MBB->getReverseIterator() == MBB->getParent()->rbegin())
943  return;
944 
945  const std::vector<MCCFIInstruction> &Instrs = MF->getFrameInstructions();
946  unsigned CFIIndex = MI.getOperand(0).getCFIIndex();
947  const MCCFIInstruction &CFI = Instrs[CFIIndex];
948  emitCFIInstruction(CFI);
949 }
950 
952  // The operands are the MCSymbol and the frame offset of the allocation.
953  MCSymbol *FrameAllocSym = MI.getOperand(0).getMCSymbol();
954  int FrameOffset = MI.getOperand(1).getImm();
955 
956  // Emit a symbol assignment.
957  OutStreamer->EmitAssignment(FrameAllocSym,
958  MCConstantExpr::create(FrameOffset, OutContext));
959 }
960 
963  return;
964 
965  MCSection *StackSizeSection = getObjFileLowering().getStackSizesSection();
966  if (!StackSizeSection)
967  return;
968 
969  const MachineFrameInfo &FrameInfo = MF.getFrameInfo();
970  // Don't emit functions with dynamic stack allocations.
971  if (FrameInfo.hasVarSizedObjects())
972  return;
973 
974  OutStreamer->PushSection();
975  OutStreamer->SwitchSection(StackSizeSection);
976 
977  const MCSymbol *FunctionSymbol = getSymbol(&MF.getFunction());
978  uint64_t StackSize = FrameInfo.getStackSize();
979  OutStreamer->EmitSymbolValue(FunctionSymbol, TM.getPointerSize());
980  OutStreamer->EmitULEB128IntValue(StackSize);
981 
982  OutStreamer->PopSection();
983 }
984 
987  if (!MF.getLandingPads().empty() || MF.hasEHFunclets() || MMI->hasDebugInfo())
988  return true;
989 
990  // We might emit an EH table that uses function begin and end labels even if
991  // we don't have any landingpads.
992  if (!MF.getFunction().hasPersonalityFn())
993  return false;
994  return !isNoOpWithoutInvoke(
996 }
997 
998 /// EmitFunctionBody - This method emits the body and trailer for a
999 /// function.
1001  EmitFunctionHeader();
1002 
1003  // Emit target-specific gunk before the function body.
1005 
1006  bool ShouldPrintDebugScopes = MMI->hasDebugInfo();
1007 
1008  // Print out code for the function.
1009  bool HasAnyRealCode = false;
1010  int NumInstsInFunction = 0;
1011  for (auto &MBB : *MF) {
1012  // Print a label for the basic block.
1013  EmitBasicBlockStart(MBB);
1014  for (auto &MI : MBB) {
1015  // Print the assembly for the instruction.
1016  if (!MI.isPosition() && !MI.isImplicitDef() && !MI.isKill() &&
1017  !MI.isDebugValue()) {
1018  HasAnyRealCode = true;
1019  ++NumInstsInFunction;
1020  }
1021 
1022  if (ShouldPrintDebugScopes) {
1023  for (const HandlerInfo &HI : Handlers) {
1024  NamedRegionTimer T(HI.TimerName, HI.TimerDescription,
1025  HI.TimerGroupName, HI.TimerGroupDescription,
1027  HI.Handler->beginInstruction(&MI);
1028  }
1029  }
1030 
1031  if (isVerbose() && emitComments(MI, OutStreamer->GetCommentOS(), this)) {
1032  MachineInstr *MIP = const_cast<MachineInstr *>(&MI);
1034  }
1035 
1036  switch (MI.getOpcode()) {
1037  case TargetOpcode::CFI_INSTRUCTION:
1039  break;
1040  case TargetOpcode::LOCAL_ESCAPE:
1041  emitFrameAlloc(MI);
1042  break;
1044  case TargetOpcode::GC_LABEL:
1045  OutStreamer->EmitLabel(MI.getOperand(0).getMCSymbol());
1046  break;
1048  EmitInlineAsm(&MI);
1049  break;
1050  case TargetOpcode::DBG_VALUE:
1051  if (isVerbose()) {
1052  if (!emitDebugValueComment(&MI, *this))
1053  EmitInstruction(&MI);
1054  }
1055  break;
1056  case TargetOpcode::IMPLICIT_DEF:
1057  if (isVerbose()) emitImplicitDef(&MI);
1058  break;
1059  case TargetOpcode::KILL:
1060  if (isVerbose()) emitKill(&MI, *this);
1061  break;
1062  default:
1063  EmitInstruction(&MI);
1064  break;
1065  }
1066 
1067  if (ShouldPrintDebugScopes) {
1068  for (const HandlerInfo &HI : Handlers) {
1069  NamedRegionTimer T(HI.TimerName, HI.TimerDescription,
1070  HI.TimerGroupName, HI.TimerGroupDescription,
1072  HI.Handler->endInstruction();
1073  }
1074  }
1075  }
1076 
1077  EmitBasicBlockEnd(MBB);
1078  }
1079 
1080  EmittedInsts += NumInstsInFunction;
1081  MachineOptimizationRemarkAnalysis R(DEBUG_TYPE, "InstructionCount",
1082  MF->getFunction().getSubprogram(),
1083  &MF->front());
1084  R << ore::NV("NumInstructions", NumInstsInFunction)
1085  << " instructions in function";
1086  ORE->emit(R);
1087 
1088  // If the function is empty and the object file uses .subsections_via_symbols,
1089  // then we need to emit *something* to the function body to prevent the
1090  // labels from collapsing together. Just emit a noop.
1091  // Similarly, don't emit empty functions on Windows either. It can lead to
1092  // duplicate entries (two functions with the same RVA) in the Guard CF Table
1093  // after linking, causing the kernel not to load the binary:
1094  // https://developercommunity.visualstudio.com/content/problem/45366/vc-linker-creates-invalid-dll-with-clang-cl.html
1095  // FIXME: Hide this behind some API in e.g. MCAsmInfo or MCTargetStreamer.
1096  const Triple &TT = TM.getTargetTriple();
1097  if (!HasAnyRealCode && (MAI->hasSubsectionsViaSymbols() ||
1098  (TT.isOSWindows() && TT.isOSBinFormatCOFF()))) {
1099  MCInst Noop;
1100  MF->getSubtarget().getInstrInfo()->getNoop(Noop);
1101 
1102  // Targets can opt-out of emitting the noop here by leaving the opcode
1103  // unspecified.
1104  if (Noop.getOpcode()) {
1105  OutStreamer->AddComment("avoids zero-length function");
1106  OutStreamer->EmitInstruction(Noop, getSubtargetInfo());
1107  }
1108  }
1109 
1110  const Function &F = MF->getFunction();
1111  for (const auto &BB : F) {
1112  if (!BB.hasAddressTaken())
1113  continue;
1114  MCSymbol *Sym = GetBlockAddressSymbol(&BB);
1115  if (Sym->isDefined())
1116  continue;
1117  OutStreamer->AddComment("Address of block that was removed by CodeGen");
1118  OutStreamer->EmitLabel(Sym);
1119  }
1120 
1121  // Emit target-specific gunk after the function body.
1123 
1124  if (needFuncLabelsForEHOrDebugInfo(*MF, MMI) ||
1126  // Create a symbol for the end of function.
1127  CurrentFnEnd = createTempSymbol("func_end");
1128  OutStreamer->EmitLabel(CurrentFnEnd);
1129  }
1130 
1131  // If the target wants a .size directive for the size of the function, emit
1132  // it.
1134  // We can get the size as difference between the function label and the
1135  // temp label.
1136  const MCExpr *SizeExp = MCBinaryExpr::createSub(
1137  MCSymbolRefExpr::create(CurrentFnEnd, OutContext),
1139  OutStreamer->emitELFSize(CurrentFnSym, SizeExp);
1140  }
1141 
1142  for (const HandlerInfo &HI : Handlers) {
1143  NamedRegionTimer T(HI.TimerName, HI.TimerDescription, HI.TimerGroupName,
1144  HI.TimerGroupDescription, TimePassesIsEnabled);
1145  HI.Handler->markFunctionEnd();
1146  }
1147 
1148  // Print out jump tables referenced by the function.
1150 
1151  // Emit post-function debug and/or EH information.
1152  for (const HandlerInfo &HI : Handlers) {
1153  NamedRegionTimer T(HI.TimerName, HI.TimerDescription, HI.TimerGroupName,
1154  HI.TimerGroupDescription, TimePassesIsEnabled);
1155  HI.Handler->endFunction(MF);
1156  }
1157 
1158  // Emit section containing stack size metadata.
1159  emitStackSizeSection(*MF);
1160 
1161  if (isVerbose())
1162  OutStreamer->GetCommentOS() << "-- End function\n";
1163 
1164  OutStreamer->AddBlankLine();
1165 }
1166 
1167 /// \brief Compute the number of Global Variables that uses a Constant.
1168 static unsigned getNumGlobalVariableUses(const Constant *C) {
1169  if (!C)
1170  return 0;
1171 
1172  if (isa<GlobalVariable>(C))
1173  return 1;
1174 
1175  unsigned NumUses = 0;
1176  for (auto *CU : C->users())
1177  NumUses += getNumGlobalVariableUses(dyn_cast<Constant>(CU));
1178 
1179  return NumUses;
1180 }
1181 
1182 /// \brief Only consider global GOT equivalents if at least one user is a
1183 /// cstexpr inside an initializer of another global variables. Also, don't
1184 /// handle cstexpr inside instructions. During global variable emission,
1185 /// candidates are skipped and are emitted later in case at least one cstexpr
1186 /// isn't replaced by a PC relative GOT entry access.
1188  unsigned &NumGOTEquivUsers) {
1189  // Global GOT equivalents are unnamed private globals with a constant
1190  // pointer initializer to another global symbol. They must point to a
1191  // GlobalVariable or Function, i.e., as GlobalValue.
1192  if (!GV->hasGlobalUnnamedAddr() || !GV->hasInitializer() ||
1193  !GV->isConstant() || !GV->isDiscardableIfUnused() ||
1194  !dyn_cast<GlobalValue>(GV->getOperand(0)))
1195  return false;
1196 
1197  // To be a got equivalent, at least one of its users need to be a constant
1198  // expression used by another global variable.
1199  for (auto *U : GV->users())
1200  NumGOTEquivUsers += getNumGlobalVariableUses(dyn_cast<Constant>(U));
1201 
1202  return NumGOTEquivUsers > 0;
1203 }
1204 
1205 /// \brief Unnamed constant global variables solely contaning a pointer to
1206 /// another globals variable is equivalent to a GOT table entry; it contains the
1207 /// the address of another symbol. Optimize it and replace accesses to these
1208 /// "GOT equivalents" by using the GOT entry for the final global instead.
1209 /// Compute GOT equivalent candidates among all global variables to avoid
1210 /// emitting them if possible later on, after it use is replaced by a GOT entry
1211 /// access.
1213  if (!getObjFileLowering().supportIndirectSymViaGOTPCRel())
1214  return;
1215 
1216  for (const auto &G : M.globals()) {
1217  unsigned NumGOTEquivUsers = 0;
1218  if (!isGOTEquivalentCandidate(&G, NumGOTEquivUsers))
1219  continue;
1220 
1221  const MCSymbol *GOTEquivSym = getSymbol(&G);
1222  GlobalGOTEquivs[GOTEquivSym] = std::make_pair(&G, NumGOTEquivUsers);
1223  }
1224 }
1225 
1226 /// \brief Constant expressions using GOT equivalent globals may not be eligible
1227 /// for PC relative GOT entry conversion, in such cases we need to emit such
1228 /// globals we previously omitted in EmitGlobalVariable.
1230  if (!getObjFileLowering().supportIndirectSymViaGOTPCRel())
1231  return;
1232 
1233  SmallVector<const GlobalVariable *, 8> FailedCandidates;
1234  for (auto &I : GlobalGOTEquivs) {
1235  const GlobalVariable *GV = I.second.first;
1236  unsigned Cnt = I.second.second;
1237  if (Cnt)
1238  FailedCandidates.push_back(GV);
1239  }
1240  GlobalGOTEquivs.clear();
1241 
1242  for (auto *GV : FailedCandidates)
1243  EmitGlobalVariable(GV);
1244 }
1245 
1246 void AsmPrinter::emitGlobalIndirectSymbol(Module &M,
1247  const GlobalIndirectSymbol& GIS) {
1248  MCSymbol *Name = getSymbol(&GIS);
1249 
1250  if (GIS.hasExternalLinkage() || !MAI->getWeakRefDirective())
1251  OutStreamer->EmitSymbolAttribute(Name, MCSA_Global);
1252  else if (GIS.hasWeakLinkage() || GIS.hasLinkOnceLinkage())
1253  OutStreamer->EmitSymbolAttribute(Name, MCSA_WeakReference);
1254  else
1255  assert(GIS.hasLocalLinkage() && "Invalid alias or ifunc linkage");
1256 
1257  // Set the symbol type to function if the alias has a function type.
1258  // This affects codegen when the aliasee is not a function.
1259  if (GIS.getType()->getPointerElementType()->isFunctionTy()) {
1260  OutStreamer->EmitSymbolAttribute(Name, MCSA_ELF_TypeFunction);
1261  if (isa<GlobalIFunc>(GIS))
1262  OutStreamer->EmitSymbolAttribute(Name, MCSA_ELF_TypeIndFunction);
1263  }
1264 
1265  EmitVisibility(Name, GIS.getVisibility());
1266 
1267  const MCExpr *Expr = lowerConstant(GIS.getIndirectSymbol());
1268 
1269  if (isa<GlobalAlias>(&GIS) && MAI->hasAltEntry() && isa<MCBinaryExpr>(Expr))
1270  OutStreamer->EmitSymbolAttribute(Name, MCSA_AltEntry);
1271 
1272  // Emit the directives as assignments aka .set:
1273  OutStreamer->EmitAssignment(Name, Expr);
1274 
1275  if (auto *GA = dyn_cast<GlobalAlias>(&GIS)) {
1276  // If the aliasee does not correspond to a symbol in the output, i.e. the
1277  // alias is not of an object or the aliased object is private, then set the
1278  // size of the alias symbol from the type of the alias. We don't do this in
1279  // other situations as the alias and aliasee having differing types but same
1280  // size may be intentional.
1281  const GlobalObject *BaseObject = GA->getBaseObject();
1282  if (MAI->hasDotTypeDotSizeDirective() && GA->getValueType()->isSized() &&
1283  (!BaseObject || BaseObject->hasPrivateLinkage())) {
1284  const DataLayout &DL = M.getDataLayout();
1285  uint64_t Size = DL.getTypeAllocSize(GA->getValueType());
1286  OutStreamer->emitELFSize(Name, MCConstantExpr::create(Size, OutContext));
1287  }
1288  }
1289 }
1290 
1292  // Set the MachineFunction to nullptr so that we can catch attempted
1293  // accesses to MF specific features at the module level and so that
1294  // we can conditionalize accesses based on whether or not it is nullptr.
1295  MF = nullptr;
1296 
1297  // Gather all GOT equivalent globals in the module. We really need two
1298  // passes over the globals: one to compute and another to avoid its emission
1299  // in EmitGlobalVariable, otherwise we would not be able to handle cases
1300  // where the got equivalent shows up before its use.
1302 
1303  // Emit global variables.
1304  for (const auto &G : M.globals())
1306 
1307  // Emit remaining GOT equivalent globals.
1309 
1310  // Emit visibility info for declarations
1311  for (const Function &F : M) {
1312  if (!F.isDeclarationForLinker())
1313  continue;
1314  GlobalValue::VisibilityTypes V = F.getVisibility();
1316  continue;
1317 
1318  MCSymbol *Name = getSymbol(&F);
1319  EmitVisibility(Name, V, false);
1320  }
1321 
1323 
1324  TLOF.emitModuleMetadata(*OutStreamer, M, TM);
1325 
1328 
1329  // Output stubs for external and common global variables.
1331  if (!Stubs.empty()) {
1332  OutStreamer->SwitchSection(TLOF.getDataSection());
1333  const DataLayout &DL = M.getDataLayout();
1334 
1335  for (const auto &Stub : Stubs) {
1336  OutStreamer->EmitLabel(Stub.first);
1337  OutStreamer->EmitSymbolValue(Stub.second.getPointer(),
1338  DL.getPointerSize());
1339  }
1340  }
1341  }
1342 
1343  // Finalize debug and EH information.
1344  for (const HandlerInfo &HI : Handlers) {
1345  NamedRegionTimer T(HI.TimerName, HI.TimerDescription, HI.TimerGroupName,
1346  HI.TimerGroupDescription, TimePassesIsEnabled);
1347  HI.Handler->endModule();
1348  delete HI.Handler;
1349  }
1350  Handlers.clear();
1351  DD = nullptr;
1352 
1353  // If the target wants to know about weak references, print them all.
1354  if (MAI->getWeakRefDirective()) {
1355  // FIXME: This is not lazy, it would be nice to only print weak references
1356  // to stuff that is actually used. Note that doing so would require targets
1357  // to notice uses in operands (due to constant exprs etc). This should
1358  // happen with the MC stuff eventually.
1359 
1360  // Print out module-level global objects here.
1361  for (const auto &GO : M.global_objects()) {
1362  if (!GO.hasExternalWeakLinkage())
1363  continue;
1364  OutStreamer->EmitSymbolAttribute(getSymbol(&GO), MCSA_WeakReference);
1365  }
1366  }
1367 
1368  OutStreamer->AddBlankLine();
1369 
1370  // Print aliases in topological order, that is, for each alias a = b,
1371  // b must be printed before a.
1372  // This is because on some targets (e.g. PowerPC) linker expects aliases in
1373  // such an order to generate correct TOC information.
1376  for (const auto &Alias : M.aliases()) {
1377  for (const GlobalAlias *Cur = &Alias; Cur;
1378  Cur = dyn_cast<GlobalAlias>(Cur->getAliasee())) {
1379  if (!AliasVisited.insert(Cur).second)
1380  break;
1381  AliasStack.push_back(Cur);
1382  }
1383  for (const GlobalAlias *AncestorAlias : llvm::reverse(AliasStack))
1384  emitGlobalIndirectSymbol(M, *AncestorAlias);
1385  AliasStack.clear();
1386  }
1387  for (const auto &IFunc : M.ifuncs())
1388  emitGlobalIndirectSymbol(M, IFunc);
1389 
1390  GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
1391  assert(MI && "AsmPrinter didn't require GCModuleInfo?");
1392  for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; )
1393  if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(**--I))
1394  MP->finishAssembly(M, *MI, *this);
1395 
1396  // Emit llvm.ident metadata in an '.ident' directive.
1397  EmitModuleIdents(M);
1398 
1399  // Emit __morestack address if needed for indirect calls.
1400  if (MMI->usesMorestackAddr()) {
1401  unsigned Align = 1;
1402  MCSection *ReadOnlySection = getObjFileLowering().getSectionForConstant(
1404  /*C=*/nullptr, Align);
1405  OutStreamer->SwitchSection(ReadOnlySection);
1406 
1407  MCSymbol *AddrSymbol =
1408  OutContext.getOrCreateSymbol(StringRef("__morestack_addr"));
1409  OutStreamer->EmitLabel(AddrSymbol);
1410 
1411  unsigned PtrSize = MAI->getCodePointerSize();
1412  OutStreamer->EmitSymbolValue(GetExternalSymbolSymbol("__morestack"),
1413  PtrSize);
1414  }
1415 
1416  // Emit .note.GNU-split-stack and .note.GNU-no-split-stack sections if
1417  // split-stack is used.
1419  OutStreamer->SwitchSection(
1420  OutContext.getELFSection(".note.GNU-split-stack", ELF::SHT_PROGBITS, 0));
1421  if (MMI->hasNosplitStack())
1422  OutStreamer->SwitchSection(
1423  OutContext.getELFSection(".note.GNU-no-split-stack", ELF::SHT_PROGBITS, 0));
1424  }
1425 
1426  // If we don't have any trampolines, then we don't require stack memory
1427  // to be executable. Some targets have a directive to declare this.
1428  Function *InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline");
1429  if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty())
1431  OutStreamer->SwitchSection(S);
1432 
1434  // Emit /EXPORT: flags for each exported global as necessary.
1435  const auto &TLOF = getObjFileLowering();
1436  std::string Flags;
1437 
1438  for (const GlobalValue &GV : M.global_values()) {
1439  raw_string_ostream OS(Flags);
1440  TLOF.emitLinkerFlagsForGlobal(OS, &GV);
1441  OS.flush();
1442  if (!Flags.empty()) {
1443  OutStreamer->SwitchSection(TLOF.getDrectveSection());
1444  OutStreamer->EmitBytes(Flags);
1445  }
1446  Flags.clear();
1447  }
1448 
1449  // Emit /INCLUDE: flags for each used global as necessary.
1450  if (const auto *LU = M.getNamedGlobal("llvm.used")) {
1451  assert(LU->hasInitializer() &&
1452  "expected llvm.used to have an initializer");
1453  assert(isa<ArrayType>(LU->getValueType()) &&
1454  "expected llvm.used to be an array type");
1455  if (const auto *A = cast<ConstantArray>(LU->getInitializer())) {
1456  for (const Value *Op : A->operands()) {
1457  const auto *GV =
1458  cast<GlobalValue>(Op->stripPointerCastsNoFollowAliases());
1459  // Global symbols with internal or private linkage are not visible to
1460  // the linker, and thus would cause an error when the linker tried to
1461  // preserve the symbol due to the `/include:` directive.
1462  if (GV->hasLocalLinkage())
1463  continue;
1464 
1465  raw_string_ostream OS(Flags);
1466  TLOF.emitLinkerFlagsForUsed(OS, GV);
1467  OS.flush();
1468 
1469  if (!Flags.empty()) {
1470  OutStreamer->SwitchSection(TLOF.getDrectveSection());
1471  OutStreamer->EmitBytes(Flags);
1472  }
1473  Flags.clear();
1474  }
1475  }
1476  }
1477  }
1478 
1479  // Allow the target to emit any magic that it wants at the end of the file,
1480  // after everything else has gone out.
1481  EmitEndOfAsmFile(M);
1482 
1483  MMI = nullptr;
1484 
1485  OutStreamer->Finish();
1486  OutStreamer->reset();
1487 
1488  return false;
1489 }
1490 
1492  if (!CurExceptionSym)
1493  CurExceptionSym = createTempSymbol("exception");
1494  return CurExceptionSym;
1495 }
1496 
1498  this->MF = &MF;
1499  // Get the function symbol.
1502  CurrentFnBegin = nullptr;
1503  CurExceptionSym = nullptr;
1504  bool NeedsLocalForSize = MAI->needsLocalForSize();
1505  if (needFuncLabelsForEHOrDebugInfo(MF, MMI) || NeedsLocalForSize) {
1506  CurrentFnBegin = createTempSymbol("func_begin");
1507  if (NeedsLocalForSize)
1508  CurrentFnSymForSize = CurrentFnBegin;
1509  }
1510 
1511  ORE = &getAnalysis<MachineOptimizationRemarkEmitterPass>().getORE();
1512  LI = &getAnalysis<MachineLoopInfo>();
1513 
1514  const TargetSubtargetInfo &STI = MF.getSubtarget();
1515  EnablePrintSchedInfo = PrintSchedule.getNumOccurrences()
1516  ? PrintSchedule
1517  : STI.supportPrintSchedInfo();
1518 }
1519 
1520 namespace {
1521 
1522 // Keep track the alignment, constpool entries per Section.
1523  struct SectionCPs {
1524  MCSection *S;
1525  unsigned Alignment;
1527 
1528  SectionCPs(MCSection *s, unsigned a) : S(s), Alignment(a) {}
1529  };
1530 
1531 } // end anonymous namespace
1532 
1533 /// EmitConstantPool - Print to the current output stream assembly
1534 /// representations of the constants in the constant pool MCP. This is
1535 /// used to print out constants which have been "spilled to memory" by
1536 /// the code generator.
1538  const MachineConstantPool *MCP = MF->getConstantPool();
1539  const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
1540  if (CP.empty()) return;
1541 
1542  // Calculate sections for constant pool entries. We collect entries to go into
1543  // the same section together to reduce amount of section switch statements.
1544  SmallVector<SectionCPs, 4> CPSections;
1545  for (unsigned i = 0, e = CP.size(); i != e; ++i) {
1546  const MachineConstantPoolEntry &CPE = CP[i];
1547  unsigned Align = CPE.getAlignment();
1548 
1549  SectionKind Kind = CPE.getSectionKind(&getDataLayout());
1550 
1551  const Constant *C = nullptr;
1552  if (!CPE.isMachineConstantPoolEntry())
1553  C = CPE.Val.ConstVal;
1554 
1556  Kind, C, Align);
1557 
1558  // The number of sections are small, just do a linear search from the
1559  // last section to the first.
1560  bool Found = false;
1561  unsigned SecIdx = CPSections.size();
1562  while (SecIdx != 0) {
1563  if (CPSections[--SecIdx].S == S) {
1564  Found = true;
1565  break;
1566  }
1567  }
1568  if (!Found) {
1569  SecIdx = CPSections.size();
1570  CPSections.push_back(SectionCPs(S, Align));
1571  }
1572 
1573  if (Align > CPSections[SecIdx].Alignment)
1574  CPSections[SecIdx].Alignment = Align;
1575  CPSections[SecIdx].CPEs.push_back(i);
1576  }
1577 
1578  // Now print stuff into the calculated sections.
1579  const MCSection *CurSection = nullptr;
1580  unsigned Offset = 0;
1581  for (unsigned i = 0, e = CPSections.size(); i != e; ++i) {
1582  for (unsigned j = 0, ee = CPSections[i].CPEs.size(); j != ee; ++j) {
1583  unsigned CPI = CPSections[i].CPEs[j];
1584  MCSymbol *Sym = GetCPISymbol(CPI);
1585  if (!Sym->isUndefined())
1586  continue;
1587 
1588  if (CurSection != CPSections[i].S) {
1589  OutStreamer->SwitchSection(CPSections[i].S);
1590  EmitAlignment(Log2_32(CPSections[i].Alignment));
1591  CurSection = CPSections[i].S;
1592  Offset = 0;
1593  }
1594 
1595  MachineConstantPoolEntry CPE = CP[CPI];
1596 
1597  // Emit inter-object padding for alignment.
1598  unsigned AlignMask = CPE.getAlignment() - 1;
1599  unsigned NewOffset = (Offset + AlignMask) & ~AlignMask;
1600  OutStreamer->EmitZeros(NewOffset - Offset);
1601 
1602  Type *Ty = CPE.getType();
1603  Offset = NewOffset + getDataLayout().getTypeAllocSize(Ty);
1604 
1605  OutStreamer->EmitLabel(Sym);
1606  if (CPE.isMachineConstantPoolEntry())
1608  else
1610  }
1611  }
1612 }
1613 
1614 /// EmitJumpTableInfo - Print assembly representations of the jump tables used
1615 /// by the current function to the current output stream.
1617  const DataLayout &DL = MF->getDataLayout();
1618  const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo();
1619  if (!MJTI) return;
1620  if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_Inline) return;
1621  const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
1622  if (JT.empty()) return;
1623 
1624  // Pick the directive to use to print the jump table entries, and switch to
1625  // the appropriate section.
1626  const Function &F = MF->getFunction();
1628  bool JTInDiffSection = !TLOF.shouldPutJumpTableInFunctionSection(
1630  F);
1631  if (JTInDiffSection) {
1632  // Drop it in the readonly section.
1633  MCSection *ReadOnlySection = TLOF.getSectionForJumpTable(F, TM);
1634  OutStreamer->SwitchSection(ReadOnlySection);
1635  }
1636 
1638 
1639  // Jump tables in code sections are marked with a data_region directive
1640  // where that's supported.
1641  if (!JTInDiffSection)
1642  OutStreamer->EmitDataRegion(MCDR_DataRegionJT32);
1643 
1644  for (unsigned JTI = 0, e = JT.size(); JTI != e; ++JTI) {
1645  const std::vector<MachineBasicBlock*> &JTBBs = JT[JTI].MBBs;
1646 
1647  // If this jump table was deleted, ignore it.
1648  if (JTBBs.empty()) continue;
1649 
1650  // For the EK_LabelDifference32 entry, if using .set avoids a relocation,
1651  /// emit a .set directive for each unique entry.
1655  const TargetLowering *TLI = MF->getSubtarget().getTargetLowering();
1657  for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
1658  const MachineBasicBlock *MBB = JTBBs[ii];
1659  if (!EmittedSets.insert(MBB).second)
1660  continue;
1661 
1662  // .set LJTSet, LBB32-base
1663  const MCExpr *LHS =
1665  OutStreamer->EmitAssignment(GetJTSetSymbol(JTI, MBB->getNumber()),
1666  MCBinaryExpr::createSub(LHS, Base,
1667  OutContext));
1668  }
1669  }
1670 
1671  // On some targets (e.g. Darwin) we want to emit two consecutive labels
1672  // before each jump table. The first label is never referenced, but tells
1673  // the assembler and linker the extents of the jump table object. The
1674  // second label is actually referenced by the code.
1675  if (JTInDiffSection && DL.hasLinkerPrivateGlobalPrefix())
1676  // FIXME: This doesn't have to have any specific name, just any randomly
1677  // named and numbered 'l' label would work. Simplify GetJTISymbol.
1678  OutStreamer->EmitLabel(GetJTISymbol(JTI, true));
1679 
1680  OutStreamer->EmitLabel(GetJTISymbol(JTI));
1681 
1682  for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
1683  EmitJumpTableEntry(MJTI, JTBBs[ii], JTI);
1684  }
1685  if (!JTInDiffSection)
1686  OutStreamer->EmitDataRegion(MCDR_DataRegionEnd);
1687 }
1688 
1689 /// EmitJumpTableEntry - Emit a jump table entry for the specified MBB to the
1690 /// current stream.
1691 void AsmPrinter::EmitJumpTableEntry(const MachineJumpTableInfo *MJTI,
1692  const MachineBasicBlock *MBB,
1693  unsigned UID) const {
1694  assert(MBB && MBB->getNumber() >= 0 && "Invalid basic block");
1695  const MCExpr *Value = nullptr;
1696  switch (MJTI->getEntryKind()) {
1698  llvm_unreachable("Cannot emit EK_Inline jump table entry");
1701  MJTI, MBB, UID, OutContext);
1702  break;
1704  // EK_BlockAddress - Each entry is a plain address of block, e.g.:
1705  // .word LBB123
1706  Value = MCSymbolRefExpr::create(MBB->getSymbol(), OutContext);
1707  break;
1709  // EK_GPRel32BlockAddress - Each entry is an address of block, encoded
1710  // with a relocation as gp-relative, e.g.:
1711  // .gprel32 LBB123
1712  MCSymbol *MBBSym = MBB->getSymbol();
1713  OutStreamer->EmitGPRel32Value(MCSymbolRefExpr::create(MBBSym, OutContext));
1714  return;
1715  }
1716 
1718  // EK_GPRel64BlockAddress - Each entry is an address of block, encoded
1719  // with a relocation as gp-relative, e.g.:
1720  // .gpdword LBB123
1721  MCSymbol *MBBSym = MBB->getSymbol();
1722  OutStreamer->EmitGPRel64Value(MCSymbolRefExpr::create(MBBSym, OutContext));
1723  return;
1724  }
1725 
1727  // Each entry is the address of the block minus the address of the jump
1728  // table. This is used for PIC jump tables where gprel32 is not supported.
1729  // e.g.:
1730  // .word LBB123 - LJTI1_2
1731  // If the .set directive avoids relocations, this is emitted as:
1732  // .set L4_5_set_123, LBB123 - LJTI1_2
1733  // .word L4_5_set_123
1735  Value = MCSymbolRefExpr::create(GetJTSetSymbol(UID, MBB->getNumber()),
1736  OutContext);
1737  break;
1738  }
1739  Value = MCSymbolRefExpr::create(MBB->getSymbol(), OutContext);
1740  const TargetLowering *TLI = MF->getSubtarget().getTargetLowering();
1741  const MCExpr *Base = TLI->getPICJumpTableRelocBaseExpr(MF, UID, OutContext);
1742  Value = MCBinaryExpr::createSub(Value, Base, OutContext);
1743  break;
1744  }
1745  }
1746 
1747  assert(Value && "Unknown entry kind!");
1748 
1749  unsigned EntrySize = MJTI->getEntrySize(getDataLayout());
1750  OutStreamer->EmitValue(Value, EntrySize);
1751 }
1752 
1753 /// EmitSpecialLLVMGlobal - Check to see if the specified global is a
1754 /// special global used by LLVM. If so, emit it and return true, otherwise
1755 /// do nothing and return false.
1757  if (GV->getName() == "llvm.used") {
1758  if (MAI->hasNoDeadStrip()) // No need to emit this at all.
1759  EmitLLVMUsedList(cast<ConstantArray>(GV->getInitializer()));
1760  return true;
1761  }
1762 
1763  // Ignore debug and non-emitted data. This handles llvm.compiler.used.
1764  if (GV->getSection() == "llvm.metadata" ||
1766  return true;
1767 
1768  if (!GV->hasAppendingLinkage()) return false;
1769 
1770  assert(GV->hasInitializer() && "Not a special LLVM global!");
1771 
1772  if (GV->getName() == "llvm.global_ctors") {
1773  EmitXXStructorList(GV->getParent()->getDataLayout(), GV->getInitializer(),
1774  /* isCtor */ true);
1775 
1776  return true;
1777  }
1778 
1779  if (GV->getName() == "llvm.global_dtors") {
1780  EmitXXStructorList(GV->getParent()->getDataLayout(), GV->getInitializer(),
1781  /* isCtor */ false);
1782 
1783  return true;
1784  }
1785 
1786  report_fatal_error("unknown special variable");
1787 }
1788 
1789 /// EmitLLVMUsedList - For targets that define a MAI::UsedDirective, mark each
1790 /// global in the specified llvm.used list for which emitUsedDirectiveFor
1791 /// is true, as being used with this directive.
1792 void AsmPrinter::EmitLLVMUsedList(const ConstantArray *InitList) {
1793  // Should be an array of 'i8*'.
1794  for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
1795  const GlobalValue *GV =
1797  if (GV)
1798  OutStreamer->EmitSymbolAttribute(getSymbol(GV), MCSA_NoDeadStrip);
1799  }
1800 }
1801 
1802 namespace {
1803 
1804 struct Structor {
1805  int Priority = 0;
1806  Constant *Func = nullptr;
1807  GlobalValue *ComdatKey = nullptr;
1808 
1809  Structor() = default;
1810 };
1811 
1812 } // end anonymous namespace
1813 
1814 /// EmitXXStructorList - Emit the ctor or dtor list taking into account the init
1815 /// priority.
1816 void AsmPrinter::EmitXXStructorList(const DataLayout &DL, const Constant *List,
1817  bool isCtor) {
1818  // Should be an array of '{ int, void ()* }' structs. The first value is the
1819  // init priority.
1820  if (!isa<ConstantArray>(List)) return;
1821 
1822  // Sanity check the structors list.
1823  const ConstantArray *InitList = dyn_cast<ConstantArray>(List);
1824  if (!InitList) return; // Not an array!
1825  StructType *ETy = dyn_cast<StructType>(InitList->getType()->getElementType());
1826  // FIXME: Only allow the 3-field form in LLVM 4.0.
1827  if (!ETy || ETy->getNumElements() < 2 || ETy->getNumElements() > 3)
1828  return; // Not an array of two or three elements!
1829  if (!isa<IntegerType>(ETy->getTypeAtIndex(0U)) ||
1830  !isa<PointerType>(ETy->getTypeAtIndex(1U))) return; // Not (int, ptr).
1831  if (ETy->getNumElements() == 3 && !isa<PointerType>(ETy->getTypeAtIndex(2U)))
1832  return; // Not (int, ptr, ptr).
1833 
1834  // Gather the structors in a form that's convenient for sorting by priority.
1835  SmallVector<Structor, 8> Structors;
1836  for (Value *O : InitList->operands()) {
1838  if (!CS) continue; // Malformed.
1839  if (CS->getOperand(1)->isNullValue())
1840  break; // Found a null terminator, skip the rest.
1841  ConstantInt *Priority = dyn_cast<ConstantInt>(CS->getOperand(0));
1842  if (!Priority) continue; // Malformed.
1843  Structors.push_back(Structor());
1844  Structor &S = Structors.back();
1845  S.Priority = Priority->getLimitedValue(65535);
1846  S.Func = CS->getOperand(1);
1847  if (ETy->getNumElements() == 3 && !CS->getOperand(2)->isNullValue())
1848  S.ComdatKey =
1849  dyn_cast<GlobalValue>(CS->getOperand(2)->stripPointerCasts());
1850  }
1851 
1852  // Emit the function pointers in the target-specific order
1853  unsigned Align = Log2_32(DL.getPointerPrefAlignment());
1854  std::stable_sort(Structors.begin(), Structors.end(),
1855  [](const Structor &L,
1856  const Structor &R) { return L.Priority < R.Priority; });
1857  for (Structor &S : Structors) {
1859  const MCSymbol *KeySym = nullptr;
1860  if (GlobalValue *GV = S.ComdatKey) {
1861  if (GV->isDeclarationForLinker())
1862  // If the associated variable is not defined in this module
1863  // (it might be available_externally, or have been an
1864  // available_externally definition that was dropped by the
1865  // EliminateAvailableExternally pass), some other TU
1866  // will provide its dynamic initializer.
1867  continue;
1868 
1869  KeySym = getSymbol(GV);
1870  }
1871  MCSection *OutputSection =
1872  (isCtor ? Obj.getStaticCtorSection(S.Priority, KeySym)
1873  : Obj.getStaticDtorSection(S.Priority, KeySym));
1874  OutStreamer->SwitchSection(OutputSection);
1875  if (OutStreamer->getCurrentSection() != OutStreamer->getPreviousSection())
1876  EmitAlignment(Align);
1877  EmitXXStructor(DL, S.Func);
1878  }
1879 }
1880 
1881 void AsmPrinter::EmitModuleIdents(Module &M) {
1882  if (!MAI->hasIdentDirective())
1883  return;
1884 
1885  if (const NamedMDNode *NMD = M.getNamedMetadata("llvm.ident")) {
1886  for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) {
1887  const MDNode *N = NMD->getOperand(i);
1888  assert(N->getNumOperands() == 1 &&
1889  "llvm.ident metadata entry can have only one operand");
1890  const MDString *S = cast<MDString>(N->getOperand(0));
1891  OutStreamer->EmitIdent(S->getString());
1892  }
1893  }
1894 }
1895 
1896 //===--------------------------------------------------------------------===//
1897 // Emission and print routines
1898 //
1899 
1900 /// EmitInt8 - Emit a byte directive and value.
1901 ///
1902 void AsmPrinter::EmitInt8(int Value) const {
1903  OutStreamer->EmitIntValue(Value, 1);
1904 }
1905 
1906 /// EmitInt16 - Emit a short directive and value.
1907 void AsmPrinter::EmitInt16(int Value) const {
1908  OutStreamer->EmitIntValue(Value, 2);
1909 }
1910 
1911 /// EmitInt32 - Emit a long directive and value.
1912 void AsmPrinter::EmitInt32(int Value) const {
1913  OutStreamer->EmitIntValue(Value, 4);
1914 }
1915 
1916 /// Emit something like ".long Hi-Lo" where the size in bytes of the directive
1917 /// is specified by Size and Hi/Lo specify the labels. This implicitly uses
1918 /// .set if it avoids relocations.
1920  unsigned Size) const {
1921  OutStreamer->emitAbsoluteSymbolDiff(Hi, Lo, Size);
1922 }
1923 
1924 /// EmitLabelPlusOffset - Emit something like ".long Label+Offset"
1925 /// where the size in bytes of the directive is specified by Size and Label
1926 /// specifies the label. This implicitly uses .set if it is available.
1928  unsigned Size,
1929  bool IsSectionRelative) const {
1930  if (MAI->needsDwarfSectionOffsetDirective() && IsSectionRelative) {
1931  OutStreamer->EmitCOFFSecRel32(Label, Offset);
1932  if (Size > 4)
1933  OutStreamer->EmitZeros(Size - 4);
1934  return;
1935  }
1936 
1937  // Emit Label+Offset (or just Label if Offset is zero)
1938  const MCExpr *Expr = MCSymbolRefExpr::create(Label, OutContext);
1939  if (Offset)
1940  Expr = MCBinaryExpr::createAdd(
1941  Expr, MCConstantExpr::create(Offset, OutContext), OutContext);
1942 
1943  OutStreamer->EmitValue(Expr, Size);
1944 }
1945 
1946 //===----------------------------------------------------------------------===//
1947 
1948 // EmitAlignment - Emit an alignment directive to the specified power of
1949 // two boundary. For example, if you pass in 3 here, you will get an 8
1950 // byte alignment. If a global value is specified, and if that global has
1951 // an explicit alignment requested, it will override the alignment request
1952 // if required for correctness.
1953 void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalObject *GV) const {
1954  if (GV)
1955  NumBits = getGVAlignmentLog2(GV, GV->getParent()->getDataLayout(), NumBits);
1956 
1957  if (NumBits == 0) return; // 1-byte aligned: no need to emit alignment.
1958 
1959  assert(NumBits <
1960  static_cast<unsigned>(std::numeric_limits<unsigned>::digits) &&
1961  "undefined behavior");
1962  if (getCurrentSection()->getKind().isText())
1963  OutStreamer->EmitCodeAlignment(1u << NumBits);
1964  else
1965  OutStreamer->EmitValueToAlignment(1u << NumBits);
1966 }
1967 
1968 //===----------------------------------------------------------------------===//
1969 // Constant emission.
1970 //===----------------------------------------------------------------------===//
1971 
1973  MCContext &Ctx = OutContext;
1974 
1975  if (CV->isNullValue() || isa<UndefValue>(CV))
1976  return MCConstantExpr::create(0, Ctx);
1977 
1978  if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV))
1979  return MCConstantExpr::create(CI->getZExtValue(), Ctx);
1980 
1981  if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV))
1982  return MCSymbolRefExpr::create(getSymbol(GV), Ctx);
1983 
1984  if (const BlockAddress *BA = dyn_cast<BlockAddress>(CV))
1986 
1987  const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV);
1988  if (!CE) {
1989  llvm_unreachable("Unknown constant value to lower!");
1990  }
1991 
1992  switch (CE->getOpcode()) {
1993  default:
1994  // If the code isn't optimized, there may be outstanding folding
1995  // opportunities. Attempt to fold the expression using DataLayout as a
1996  // last resort before giving up.
1998  if (C != CE)
1999  return lowerConstant(C);
2000 
2001  // Otherwise report the problem to the user.
2002  {
2003  std::string S;
2004  raw_string_ostream OS(S);
2005  OS << "Unsupported expression in static initializer: ";
2006  CE->printAsOperand(OS, /*PrintType=*/false,
2007  !MF ? nullptr : MF->getFunction().getParent());
2008  report_fatal_error(OS.str());
2009  }
2010  case Instruction::GetElementPtr: {
2011  // Generate a symbolic expression for the byte address
2012  APInt OffsetAI(getDataLayout().getPointerTypeSizeInBits(CE->getType()), 0);
2013  cast<GEPOperator>(CE)->accumulateConstantOffset(getDataLayout(), OffsetAI);
2014 
2015  const MCExpr *Base = lowerConstant(CE->getOperand(0));
2016  if (!OffsetAI)
2017  return Base;
2018 
2019  int64_t Offset = OffsetAI.getSExtValue();
2020  return MCBinaryExpr::createAdd(Base, MCConstantExpr::create(Offset, Ctx),
2021  Ctx);
2022  }
2023 
2024  case Instruction::Trunc:
2025  // We emit the value and depend on the assembler to truncate the generated
2026  // expression properly. This is important for differences between
2027  // blockaddress labels. Since the two labels are in the same function, it
2028  // is reasonable to treat their delta as a 32-bit value.
2030  case Instruction::BitCast:
2031  return lowerConstant(CE->getOperand(0));
2032 
2033  case Instruction::IntToPtr: {
2034  const DataLayout &DL = getDataLayout();
2035 
2036  // Handle casts to pointers by changing them into casts to the appropriate
2037  // integer type. This promotes constant folding and simplifies this code.
2038  Constant *Op = CE->getOperand(0);
2040  false/*ZExt*/);
2041  return lowerConstant(Op);
2042  }
2043 
2044  case Instruction::PtrToInt: {
2045  const DataLayout &DL = getDataLayout();
2046 
2047  // Support only foldable casts to/from pointers that can be eliminated by
2048  // changing the pointer to the appropriately sized integer type.
2049  Constant *Op = CE->getOperand(0);
2050  Type *Ty = CE->getType();
2051 
2052  const MCExpr *OpExpr = lowerConstant(Op);
2053 
2054  // We can emit the pointer value into this slot if the slot is an
2055  // integer slot equal to the size of the pointer.
2056  if (DL.getTypeAllocSize(Ty) == DL.getTypeAllocSize(Op->getType()))
2057  return OpExpr;
2058 
2059  // Otherwise the pointer is smaller than the resultant integer, mask off
2060  // the high bits so we are sure to get a proper truncation if the input is
2061  // a constant expr.
2062  unsigned InBits = DL.getTypeAllocSizeInBits(Op->getType());
2063  const MCExpr *MaskExpr = MCConstantExpr::create(~0ULL >> (64-InBits), Ctx);
2064  return MCBinaryExpr::createAnd(OpExpr, MaskExpr, Ctx);
2065  }
2066 
2067  case Instruction::Sub: {
2068  GlobalValue *LHSGV;
2069  APInt LHSOffset;
2070  if (IsConstantOffsetFromGlobal(CE->getOperand(0), LHSGV, LHSOffset,
2071  getDataLayout())) {
2072  GlobalValue *RHSGV;
2073  APInt RHSOffset;
2074  if (IsConstantOffsetFromGlobal(CE->getOperand(1), RHSGV, RHSOffset,
2075  getDataLayout())) {
2076  const MCExpr *RelocExpr =
2077  getObjFileLowering().lowerRelativeReference(LHSGV, RHSGV, TM);
2078  if (!RelocExpr)
2079  RelocExpr = MCBinaryExpr::createSub(
2080  MCSymbolRefExpr::create(getSymbol(LHSGV), Ctx),
2081  MCSymbolRefExpr::create(getSymbol(RHSGV), Ctx), Ctx);
2082  int64_t Addend = (LHSOffset - RHSOffset).getSExtValue();
2083  if (Addend != 0)
2084  RelocExpr = MCBinaryExpr::createAdd(
2085  RelocExpr, MCConstantExpr::create(Addend, Ctx), Ctx);
2086  return RelocExpr;
2087  }
2088  }
2089  }
2090  // else fallthrough
2092 
2093  // The MC library also has a right-shift operator, but it isn't consistently
2094  // signed or unsigned between different targets.
2095  case Instruction::Add:
2096  case Instruction::Mul:
2097  case Instruction::SDiv:
2098  case Instruction::SRem:
2099  case Instruction::Shl:
2100  case Instruction::And:
2101  case Instruction::Or:
2102  case Instruction::Xor: {
2103  const MCExpr *LHS = lowerConstant(CE->getOperand(0));
2104  const MCExpr *RHS = lowerConstant(CE->getOperand(1));
2105  switch (CE->getOpcode()) {
2106  default: llvm_unreachable("Unknown binary operator constant cast expr");
2107  case Instruction::Add: return MCBinaryExpr::createAdd(LHS, RHS, Ctx);
2108  case Instruction::Sub: return MCBinaryExpr::createSub(LHS, RHS, Ctx);
2109  case Instruction::Mul: return MCBinaryExpr::createMul(LHS, RHS, Ctx);
2110  case Instruction::SDiv: return MCBinaryExpr::createDiv(LHS, RHS, Ctx);
2111  case Instruction::SRem: return MCBinaryExpr::createMod(LHS, RHS, Ctx);
2112  case Instruction::Shl: return MCBinaryExpr::createShl(LHS, RHS, Ctx);
2113  case Instruction::And: return MCBinaryExpr::createAnd(LHS, RHS, Ctx);
2114  case Instruction::Or: return MCBinaryExpr::createOr (LHS, RHS, Ctx);
2115  case Instruction::Xor: return MCBinaryExpr::createXor(LHS, RHS, Ctx);
2116  }
2117  }
2118  }
2119 }
2120 
2121 static void emitGlobalConstantImpl(const DataLayout &DL, const Constant *C,
2122  AsmPrinter &AP,
2123  const Constant *BaseCV = nullptr,
2124  uint64_t Offset = 0);
2125 
2126 static void emitGlobalConstantFP(const ConstantFP *CFP, AsmPrinter &AP);
2127 
2128 /// isRepeatedByteSequence - Determine whether the given value is
2129 /// composed of a repeated sequence of identical bytes and return the
2130 /// byte value. If it is not a repeated sequence, return -1.
2133  assert(!Data.empty() && "Empty aggregates should be CAZ node");
2134  char C = Data[0];
2135  for (unsigned i = 1, e = Data.size(); i != e; ++i)
2136  if (Data[i] != C) return -1;
2137  return static_cast<uint8_t>(C); // Ensure 255 is not returned as -1.
2138 }
2139 
2140 /// isRepeatedByteSequence - Determine whether the given value is
2141 /// composed of a repeated sequence of identical bytes and return the
2142 /// byte value. If it is not a repeated sequence, return -1.
2143 static int isRepeatedByteSequence(const Value *V, const DataLayout &DL) {
2144  if (const ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
2145  uint64_t Size = DL.getTypeAllocSizeInBits(V->getType());
2146  assert(Size % 8 == 0);
2147 
2148  // Extend the element to take zero padding into account.
2149  APInt Value = CI->getValue().zextOrSelf(Size);
2150  if (!Value.isSplat(8))
2151  return -1;
2152 
2153  return Value.zextOrTrunc(8).getZExtValue();
2154  }
2155  if (const ConstantArray *CA = dyn_cast<ConstantArray>(V)) {
2156  // Make sure all array elements are sequences of the same repeated
2157  // byte.
2158  assert(CA->getNumOperands() != 0 && "Should be a CAZ");
2159  Constant *Op0 = CA->getOperand(0);
2160  int Byte = isRepeatedByteSequence(Op0, DL);
2161  if (Byte == -1)
2162  return -1;
2163 
2164  // All array elements must be equal.
2165  for (unsigned i = 1, e = CA->getNumOperands(); i != e; ++i)
2166  if (CA->getOperand(i) != Op0)
2167  return -1;
2168  return Byte;
2169  }
2170 
2171  if (const ConstantDataSequential *CDS = dyn_cast<ConstantDataSequential>(V))
2172  return isRepeatedByteSequence(CDS);
2173 
2174  return -1;
2175 }
2176 
2178  const ConstantDataSequential *CDS,
2179  AsmPrinter &AP) {
2180  // See if we can aggregate this into a .fill, if so, emit it as such.
2181  int Value = isRepeatedByteSequence(CDS, DL);
2182  if (Value != -1) {
2183  uint64_t Bytes = DL.getTypeAllocSize(CDS->getType());
2184  // Don't emit a 1-byte object as a .fill.
2185  if (Bytes > 1)
2186  return AP.OutStreamer->emitFill(Bytes, Value);
2187  }
2188 
2189  // If this can be emitted with .ascii/.asciz, emit it as such.
2190  if (CDS->isString())
2191  return AP.OutStreamer->EmitBytes(CDS->getAsString());
2192 
2193  // Otherwise, emit the values in successive locations.
2194  unsigned ElementByteSize = CDS->getElementByteSize();
2195  if (isa<IntegerType>(CDS->getElementType())) {
2196  for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) {
2197  if (AP.isVerbose())
2198  AP.OutStreamer->GetCommentOS() << format("0x%" PRIx64 "\n",
2199  CDS->getElementAsInteger(i));
2200  AP.OutStreamer->EmitIntValue(CDS->getElementAsInteger(i),
2201  ElementByteSize);
2202  }
2203  } else {
2204  for (unsigned I = 0, E = CDS->getNumElements(); I != E; ++I)
2205  emitGlobalConstantFP(cast<ConstantFP>(CDS->getElementAsConstant(I)), AP);
2206  }
2207 
2208  unsigned Size = DL.getTypeAllocSize(CDS->getType());
2209  unsigned EmittedSize = DL.getTypeAllocSize(CDS->getType()->getElementType()) *
2210  CDS->getNumElements();
2211  if (unsigned Padding = Size - EmittedSize)
2212  AP.OutStreamer->EmitZeros(Padding);
2213 }
2214 
2215 static void emitGlobalConstantArray(const DataLayout &DL,
2216  const ConstantArray *CA, AsmPrinter &AP,
2217  const Constant *BaseCV, uint64_t Offset) {
2218  // See if we can aggregate some values. Make sure it can be
2219  // represented as a series of bytes of the constant value.
2220  int Value = isRepeatedByteSequence(CA, DL);
2221 
2222  if (Value != -1) {
2223  uint64_t Bytes = DL.getTypeAllocSize(CA->getType());
2224  AP.OutStreamer->emitFill(Bytes, Value);
2225  }
2226  else {
2227  for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i) {
2228  emitGlobalConstantImpl(DL, CA->getOperand(i), AP, BaseCV, Offset);
2229  Offset += DL.getTypeAllocSize(CA->getOperand(i)->getType());
2230  }
2231  }
2232 }
2233 
2234 static void emitGlobalConstantVector(const DataLayout &DL,
2235  const ConstantVector *CV, AsmPrinter &AP) {
2236  for (unsigned i = 0, e = CV->getType()->getNumElements(); i != e; ++i)
2237  emitGlobalConstantImpl(DL, CV->getOperand(i), AP);
2238 
2239  unsigned Size = DL.getTypeAllocSize(CV->getType());
2240  unsigned EmittedSize = DL.getTypeAllocSize(CV->getType()->getElementType()) *
2241  CV->getType()->getNumElements();
2242  if (unsigned Padding = Size - EmittedSize)
2243  AP.OutStreamer->EmitZeros(Padding);
2244 }
2245 
2246 static void emitGlobalConstantStruct(const DataLayout &DL,
2247  const ConstantStruct *CS, AsmPrinter &AP,
2248  const Constant *BaseCV, uint64_t Offset) {
2249  // Print the fields in successive locations. Pad to align if needed!
2250  unsigned Size = DL.getTypeAllocSize(CS->getType());
2251  const StructLayout *Layout = DL.getStructLayout(CS->getType());
2252  uint64_t SizeSoFar = 0;
2253  for (unsigned i = 0, e = CS->getNumOperands(); i != e; ++i) {
2254  const Constant *Field = CS->getOperand(i);
2255 
2256  // Print the actual field value.
2257  emitGlobalConstantImpl(DL, Field, AP, BaseCV, Offset + SizeSoFar);
2258 
2259  // Check if padding is needed and insert one or more 0s.
2260  uint64_t FieldSize = DL.getTypeAllocSize(Field->getType());
2261  uint64_t PadSize = ((i == e-1 ? Size : Layout->getElementOffset(i+1))
2262  - Layout->getElementOffset(i)) - FieldSize;
2263  SizeSoFar += FieldSize + PadSize;
2264 
2265  // Insert padding - this may include padding to increase the size of the
2266  // current field up to the ABI size (if the struct is not packed) as well
2267  // as padding to ensure that the next field starts at the right offset.
2268  AP.OutStreamer->EmitZeros(PadSize);
2269  }
2270  assert(SizeSoFar == Layout->getSizeInBytes() &&
2271  "Layout of constant struct may be incorrect!");
2272 }
2273 
2274 static void emitGlobalConstantFP(const ConstantFP *CFP, AsmPrinter &AP) {
2275  APInt API = CFP->getValueAPF().bitcastToAPInt();
2276 
2277  // First print a comment with what we think the original floating-point value
2278  // should have been.
2279  if (AP.isVerbose()) {
2281  CFP->getValueAPF().toString(StrVal);
2282 
2283  if (CFP->getType())
2284  CFP->getType()->print(AP.OutStreamer->GetCommentOS());
2285  else
2286  AP.OutStreamer->GetCommentOS() << "Printing <null> Type";
2287  AP.OutStreamer->GetCommentOS() << ' ' << StrVal << '\n';
2288  }
2289 
2290  // Now iterate through the APInt chunks, emitting them in endian-correct
2291  // order, possibly with a smaller chunk at beginning/end (e.g. for x87 80-bit
2292  // floats).
2293  unsigned NumBytes = API.getBitWidth() / 8;
2294  unsigned TrailingBytes = NumBytes % sizeof(uint64_t);
2295  const uint64_t *p = API.getRawData();
2296 
2297  // PPC's long double has odd notions of endianness compared to how LLVM
2298  // handles it: p[0] goes first for *big* endian on PPC.
2299  if (AP.getDataLayout().isBigEndian() && !CFP->getType()->isPPC_FP128Ty()) {
2300  int Chunk = API.getNumWords() - 1;
2301 
2302  if (TrailingBytes)
2303  AP.OutStreamer->EmitIntValue(p[Chunk--], TrailingBytes);
2304 
2305  for (; Chunk >= 0; --Chunk)
2306  AP.OutStreamer->EmitIntValue(p[Chunk], sizeof(uint64_t));
2307  } else {
2308  unsigned Chunk;
2309  for (Chunk = 0; Chunk < NumBytes / sizeof(uint64_t); ++Chunk)
2310  AP.OutStreamer->EmitIntValue(p[Chunk], sizeof(uint64_t));
2311 
2312  if (TrailingBytes)
2313  AP.OutStreamer->EmitIntValue(p[Chunk], TrailingBytes);
2314  }
2315 
2316  // Emit the tail padding for the long double.
2317  const DataLayout &DL = AP.getDataLayout();
2318  AP.OutStreamer->EmitZeros(DL.getTypeAllocSize(CFP->getType()) -
2319  DL.getTypeStoreSize(CFP->getType()));
2320 }
2321 
2323  const DataLayout &DL = AP.getDataLayout();
2324  unsigned BitWidth = CI->getBitWidth();
2325 
2326  // Copy the value as we may massage the layout for constants whose bit width
2327  // is not a multiple of 64-bits.
2328  APInt Realigned(CI->getValue());
2329  uint64_t ExtraBits = 0;
2330  unsigned ExtraBitsSize = BitWidth & 63;
2331 
2332  if (ExtraBitsSize) {
2333  // The bit width of the data is not a multiple of 64-bits.
2334  // The extra bits are expected to be at the end of the chunk of the memory.
2335  // Little endian:
2336  // * Nothing to be done, just record the extra bits to emit.
2337  // Big endian:
2338  // * Record the extra bits to emit.
2339  // * Realign the raw data to emit the chunks of 64-bits.
2340  if (DL.isBigEndian()) {
2341  // Basically the structure of the raw data is a chunk of 64-bits cells:
2342  // 0 1 BitWidth / 64
2343  // [chunk1][chunk2] ... [chunkN].
2344  // The most significant chunk is chunkN and it should be emitted first.
2345  // However, due to the alignment issue chunkN contains useless bits.
2346  // Realign the chunks so that they contain only useless information:
2347  // ExtraBits 0 1 (BitWidth / 64) - 1
2348  // chu[nk1 chu][nk2 chu] ... [nkN-1 chunkN]
2349  ExtraBits = Realigned.getRawData()[0] &
2350  (((uint64_t)-1) >> (64 - ExtraBitsSize));
2351  Realigned.lshrInPlace(ExtraBitsSize);
2352  } else
2353  ExtraBits = Realigned.getRawData()[BitWidth / 64];
2354  }
2355 
2356  // We don't expect assemblers to support integer data directives
2357  // for more than 64 bits, so we emit the data in at most 64-bit
2358  // quantities at a time.
2359  const uint64_t *RawData = Realigned.getRawData();
2360  for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) {
2361  uint64_t Val = DL.isBigEndian() ? RawData[e - i - 1] : RawData[i];
2362  AP.OutStreamer->EmitIntValue(Val, 8);
2363  }
2364 
2365  if (ExtraBitsSize) {
2366  // Emit the extra bits after the 64-bits chunks.
2367 
2368  // Emit a directive that fills the expected size.
2369  uint64_t Size = AP.getDataLayout().getTypeAllocSize(CI->getType());
2370  Size -= (BitWidth / 64) * 8;
2371  assert(Size && Size * 8 >= ExtraBitsSize &&
2372  (ExtraBits & (((uint64_t)-1) >> (64 - ExtraBitsSize)))
2373  == ExtraBits && "Directive too small for extra bits.");
2374  AP.OutStreamer->EmitIntValue(ExtraBits, Size);
2375  }
2376 }
2377 
2378 /// \brief Transform a not absolute MCExpr containing a reference to a GOT
2379 /// equivalent global, by a target specific GOT pc relative access to the
2380 /// final symbol.
2381 static void handleIndirectSymViaGOTPCRel(AsmPrinter &AP, const MCExpr **ME,
2382  const Constant *BaseCst,
2383  uint64_t Offset) {
2384  // The global @foo below illustrates a global that uses a got equivalent.
2385  //
2386  // @bar = global i32 42
2387  // @gotequiv = private unnamed_addr constant i32* @bar
2388  // @foo = i32 trunc (i64 sub (i64 ptrtoint (i32** @gotequiv to i64),
2389  // i64 ptrtoint (i32* @foo to i64))
2390  // to i32)
2391  //
2392  // The cstexpr in @foo is converted into the MCExpr `ME`, where we actually
2393  // check whether @foo is suitable to use a GOTPCREL. `ME` is usually in the
2394  // form:
2395  //
2396  // foo = cstexpr, where
2397  // cstexpr := <gotequiv> - "." + <cst>
2398  // cstexpr := <gotequiv> - (<foo> - <offset from @foo base>) + <cst>
2399  //
2400  // After canonicalization by evaluateAsRelocatable `ME` turns into:
2401  //
2402  // cstexpr := <gotequiv> - <foo> + gotpcrelcst, where
2403  // gotpcrelcst := <offset from @foo base> + <cst>
2404  MCValue MV;
2405  if (!(*ME)->evaluateAsRelocatable(MV, nullptr, nullptr) || MV.isAbsolute())
2406  return;
2407  const MCSymbolRefExpr *SymA = MV.getSymA();
2408  if (!SymA)
2409  return;
2410 
2411  // Check that GOT equivalent symbol is cached.
2412  const MCSymbol *GOTEquivSym = &SymA->getSymbol();
2413  if (!AP.GlobalGOTEquivs.count(GOTEquivSym))
2414  return;
2415 
2416  const GlobalValue *BaseGV = dyn_cast_or_null<GlobalValue>(BaseCst);
2417  if (!BaseGV)
2418  return;
2419 
2420  // Check for a valid base symbol
2421  const MCSymbol *BaseSym = AP.getSymbol(BaseGV);
2422  const MCSymbolRefExpr *SymB = MV.getSymB();
2423 
2424  if (!SymB || BaseSym != &SymB->getSymbol())
2425  return;
2426 
2427  // Make sure to match:
2428  //
2429  // gotpcrelcst := <offset from @foo base> + <cst>
2430  //
2431  // If gotpcrelcst is positive it means that we can safely fold the pc rel
2432  // displacement into the GOTPCREL. We can also can have an extra offset <cst>
2433  // if the target knows how to encode it.
2434  int64_t GOTPCRelCst = Offset + MV.getConstant();
2435  if (GOTPCRelCst < 0)
2436  return;
2437  if (!AP.getObjFileLowering().supportGOTPCRelWithOffset() && GOTPCRelCst != 0)
2438  return;
2439 
2440  // Emit the GOT PC relative to replace the got equivalent global, i.e.:
2441  //
2442  // bar:
2443  // .long 42
2444  // gotequiv:
2445  // .quad bar
2446  // foo:
2447  // .long gotequiv - "." + <cst>
2448  //
2449  // is replaced by the target specific equivalent to:
2450  //
2451  // bar:
2452  // .long 42
2453  // foo:
2454  // .long bar@GOTPCREL+<gotpcrelcst>
2455  AsmPrinter::GOTEquivUsePair Result = AP.GlobalGOTEquivs[GOTEquivSym];
2456  const GlobalVariable *GV = Result.first;
2457  int NumUses = (int)Result.second;
2458  const GlobalValue *FinalGV = dyn_cast<GlobalValue>(GV->getOperand(0));
2459  const MCSymbol *FinalSym = AP.getSymbol(FinalGV);
2461  FinalSym, MV, Offset, AP.MMI, *AP.OutStreamer);
2462 
2463  // Update GOT equivalent usage information
2464  --NumUses;
2465  if (NumUses >= 0)
2466  AP.GlobalGOTEquivs[GOTEquivSym] = std::make_pair(GV, NumUses);
2467 }
2468 
2469 static void emitGlobalConstantImpl(const DataLayout &DL, const Constant *CV,
2470  AsmPrinter &AP, const Constant *BaseCV,
2471  uint64_t Offset) {
2472  uint64_t Size = DL.getTypeAllocSize(CV->getType());
2473 
2474  // Globals with sub-elements such as combinations of arrays and structs
2475  // are handled recursively by emitGlobalConstantImpl. Keep track of the
2476  // constant symbol base and the current position with BaseCV and Offset.
2477  if (!BaseCV && CV->hasOneUse())
2478  BaseCV = dyn_cast<Constant>(CV->user_back());
2479 
2480  if (isa<ConstantAggregateZero>(CV) || isa<UndefValue>(CV))
2481  return AP.OutStreamer->EmitZeros(Size);
2482 
2483  if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
2484  switch (Size) {
2485  case 1:
2486  case 2:
2487  case 4:
2488  case 8:
2489  if (AP.isVerbose())
2490  AP.OutStreamer->GetCommentOS() << format("0x%" PRIx64 "\n",
2491  CI->getZExtValue());
2492  AP.OutStreamer->EmitIntValue(CI->getZExtValue(), Size);
2493  return;
2494  default:
2496  return;
2497  }
2498  }
2499 
2500  if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV))
2501  return emitGlobalConstantFP(CFP, AP);
2502 
2503  if (isa<ConstantPointerNull>(CV)) {
2504  AP.OutStreamer->EmitIntValue(0, Size);
2505  return;
2506  }
2507 
2508  if (const ConstantDataSequential *CDS = dyn_cast<ConstantDataSequential>(CV))
2509  return emitGlobalConstantDataSequential(DL, CDS, AP);
2510 
2511  if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV))
2512  return emitGlobalConstantArray(DL, CVA, AP, BaseCV, Offset);
2513 
2514  if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV))
2515  return emitGlobalConstantStruct(DL, CVS, AP, BaseCV, Offset);
2516 
2517  if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) {
2518  // Look through bitcasts, which might not be able to be MCExpr'ized (e.g. of
2519  // vectors).
2520  if (CE->getOpcode() == Instruction::BitCast)
2521  return emitGlobalConstantImpl(DL, CE->getOperand(0), AP);
2522 
2523  if (Size > 8) {
2524  // If the constant expression's size is greater than 64-bits, then we have
2525  // to emit the value in chunks. Try to constant fold the value and emit it
2526  // that way.
2527  Constant *New = ConstantFoldConstant(CE, DL);
2528  if (New && New != CE)
2529  return emitGlobalConstantImpl(DL, New, AP);
2530  }
2531  }
2532 
2533  if (const ConstantVector *V = dyn_cast<ConstantVector>(CV))
2534  return emitGlobalConstantVector(DL, V, AP);
2535 
2536  // Otherwise, it must be a ConstantExpr. Lower it to an MCExpr, then emit it
2537  // thread the streamer with EmitValue.
2538  const MCExpr *ME = AP.lowerConstant(CV);
2539 
2540  // Since lowerConstant already folded and got rid of all IR pointer and
2541  // integer casts, detect GOT equivalent accesses by looking into the MCExpr
2542  // directly.
2544  handleIndirectSymViaGOTPCRel(AP, &ME, BaseCV, Offset);
2545 
2546  AP.OutStreamer->EmitValue(ME, Size);
2547 }
2548 
2549 /// EmitGlobalConstant - Print a general LLVM constant to the .s file.
2551  uint64_t Size = DL.getTypeAllocSize(CV->getType());
2552  if (Size)
2553  emitGlobalConstantImpl(DL, CV, *this);
2554  else if (MAI->hasSubsectionsViaSymbols()) {
2555  // If the global has zero size, emit a single byte so that two labels don't
2556  // look like they are at the same location.
2557  OutStreamer->EmitIntValue(0, 1);
2558  }
2559 }
2560 
2562  // Target doesn't support this yet!
2563  llvm_unreachable("Target does not support EmitMachineConstantPoolValue");
2564 }
2565 
2566 void AsmPrinter::printOffset(int64_t Offset, raw_ostream &OS) const {
2567  if (Offset > 0)
2568  OS << '+' << Offset;
2569  else if (Offset < 0)
2570  OS << Offset;
2571 }
2572 
2573 //===----------------------------------------------------------------------===//
2574 // Symbol Lowering Routines.
2575 //===----------------------------------------------------------------------===//
2576 
2578  return OutContext.createTempSymbol(Name, true);
2579 }
2580 
2582  return MMI->getAddrLabelSymbol(BA->getBasicBlock());
2583 }
2584 
2586  return MMI->getAddrLabelSymbol(BB);
2587 }
2588 
2589 /// GetCPISymbol - Return the symbol for the specified constant pool entry.
2590 MCSymbol *AsmPrinter::GetCPISymbol(unsigned CPID) const {
2591  const DataLayout &DL = getDataLayout();
2593  "CPI" + Twine(getFunctionNumber()) + "_" +
2594  Twine(CPID));
2595 }
2596 
2597 /// GetJTISymbol - Return the symbol for the specified jump table entry.
2598 MCSymbol *AsmPrinter::GetJTISymbol(unsigned JTID, bool isLinkerPrivate) const {
2599  return MF->getJTISymbol(JTID, OutContext, isLinkerPrivate);
2600 }
2601 
2602 /// GetJTSetSymbol - Return the symbol for the specified jump table .set
2603 /// FIXME: privatize to AsmPrinter.
2604 MCSymbol *AsmPrinter::GetJTSetSymbol(unsigned UID, unsigned MBBID) const {
2605  const DataLayout &DL = getDataLayout();
2607  Twine(getFunctionNumber()) + "_" +
2608  Twine(UID) + "_set_" + Twine(MBBID));
2609 }
2610 
2612  StringRef Suffix) const {
2613  return getObjFileLowering().getSymbolWithGlobalValueBase(GV, Suffix, TM);
2614 }
2615 
2616 /// Return the MCSymbol for the specified ExternalSymbol.
2618  SmallString<60> NameStr;
2619  Mangler::getNameWithPrefix(NameStr, Sym, getDataLayout());
2620  return OutContext.getOrCreateSymbol(NameStr);
2621 }
2622 
2623 /// PrintParentLoopComment - Print comments about parent loops of this one.
2625  unsigned FunctionNumber) {
2626  if (!Loop) return;
2628  OS.indent(Loop->getLoopDepth()*2)
2629  << "Parent Loop BB" << FunctionNumber << "_"
2630  << Loop->getHeader()->getNumber()
2631  << " Depth=" << Loop->getLoopDepth() << '\n';
2632 }
2633 
2634 /// PrintChildLoopComment - Print comments about child loops within
2635 /// the loop for this basic block, with nesting.
2637  unsigned FunctionNumber) {
2638  // Add child loop information
2639  for (const MachineLoop *CL : *Loop) {
2640  OS.indent(CL->getLoopDepth()*2)
2641  << "Child Loop BB" << FunctionNumber << "_"
2642  << CL->getHeader()->getNumber() << " Depth " << CL->getLoopDepth()
2643  << '\n';
2644  PrintChildLoopComment(OS, CL, FunctionNumber);
2645  }
2646 }
2647 
2648 /// emitBasicBlockLoopComments - Pretty-print comments for basic blocks.
2650  const MachineLoopInfo *LI,
2651  const AsmPrinter &AP) {
2652  // Add loop depth information
2653  const MachineLoop *Loop = LI->getLoopFor(&MBB);
2654  if (!Loop) return;
2655 
2656  MachineBasicBlock *Header = Loop->getHeader();
2657  assert(Header && "No header for loop");
2658 
2659  // If this block is not a loop header, just print out what is the loop header
2660  // and return.
2661  if (Header != &MBB) {
2662  AP.OutStreamer->AddComment(" in Loop: Header=BB" +
2663  Twine(AP.getFunctionNumber())+"_" +
2664  Twine(Loop->getHeader()->getNumber())+
2665  " Depth="+Twine(Loop->getLoopDepth()));
2666  return;
2667  }
2668 
2669  // Otherwise, it is a loop header. Print out information about child and
2670  // parent loops.
2671  raw_ostream &OS = AP.OutStreamer->GetCommentOS();
2672 
2674 
2675  OS << "=>";
2676  OS.indent(Loop->getLoopDepth()*2-2);
2677 
2678  OS << "This ";
2679  if (Loop->empty())
2680  OS << "Inner ";
2681  OS << "Loop Header: Depth=" + Twine(Loop->getLoopDepth()) << '\n';
2682 
2683  PrintChildLoopComment(OS, Loop, AP.getFunctionNumber());
2684 }
2685 
2686 void AsmPrinter::setupCodePaddingContext(const MachineBasicBlock &MBB,
2687  MCCodePaddingContext &Context) const {
2688  assert(MF != nullptr && "Machine function must be valid");
2689  assert(LI != nullptr && "Loop info must be valid");
2690  Context.IsPaddingActive = !MF->hasInlineAsm() &&
2691  !MF->getFunction().optForSize() &&
2693  const MachineLoop *CurrentLoop = LI->getLoopFor(&MBB);
2695  CurrentLoop != nullptr && CurrentLoop->getSubLoops().empty();
2697  std::find(MBB.pred_begin(), MBB.pred_end(), MBB.getPrevNode()) !=
2698  MBB.pred_end();
2700  MBB.pred_size() > 0 && !isBlockOnlyReachableByFallthrough(&MBB);
2701 }
2702 
2703 /// EmitBasicBlockStart - This method prints the label for the specified
2704 /// MachineBasicBlock, an alignment (if present) and a comment describing
2705 /// it if appropriate.
2707  // End the previous funclet and start a new one.
2708  if (MBB.isEHFuncletEntry()) {
2709  for (const HandlerInfo &HI : Handlers) {
2710  HI.Handler->endFunclet();
2711  HI.Handler->beginFunclet(MBB);
2712  }
2713  }
2714 
2715  // Emit an alignment directive for this block, if needed.
2716  if (unsigned Align = MBB.getAlignment())
2719  setupCodePaddingContext(MBB, Context);
2720  OutStreamer->EmitCodePaddingBasicBlockStart(Context);
2721 
2722  // If the block has its address taken, emit any labels that were used to
2723  // reference the block. It is possible that there is more than one label
2724  // here, because multiple LLVM BB's may have been RAUW'd to this block after
2725  // the references were generated.
2726  if (MBB.hasAddressTaken()) {
2727  const BasicBlock *BB = MBB.getBasicBlock();
2728  if (isVerbose())
2729  OutStreamer->AddComment("Block address taken");
2730 
2731  // MBBs can have their address taken as part of CodeGen without having
2732  // their corresponding BB's address taken in IR
2733  if (BB->hasAddressTaken())
2734  for (MCSymbol *Sym : MMI->getAddrLabelSymbolToEmit(BB))
2735  OutStreamer->EmitLabel(Sym);
2736  }
2737 
2738  // Print some verbose block comments.
2739  if (isVerbose()) {
2740  if (const BasicBlock *BB = MBB.getBasicBlock()) {
2741  if (BB->hasName()) {
2742  BB->printAsOperand(OutStreamer->GetCommentOS(),
2743  /*PrintType=*/false, BB->getModule());
2744  OutStreamer->GetCommentOS() << '\n';
2745  }
2746  }
2747  emitBasicBlockLoopComments(MBB, LI, *this);
2748  }
2749 
2750  // Print the main label for the block.
2751  if (MBB.pred_empty() ||
2753  if (isVerbose()) {
2754  // NOTE: Want this comment at start of line, don't emit with AddComment.
2755  OutStreamer->emitRawComment(" %bb." + Twine(MBB.getNumber()) + ":",
2756  false);
2757  }
2758  } else {
2759  OutStreamer->EmitLabel(MBB.getSymbol());
2760  }
2761 }
2762 
2765  setupCodePaddingContext(MBB, Context);
2766  OutStreamer->EmitCodePaddingBasicBlockEnd(Context);
2767 }
2768 
2769 void AsmPrinter::EmitVisibility(MCSymbol *Sym, unsigned Visibility,
2770  bool IsDefinition) const {
2771  MCSymbolAttr Attr = MCSA_Invalid;
2772 
2773  switch (Visibility) {
2774  default: break;
2776  if (IsDefinition)
2777  Attr = MAI->getHiddenVisibilityAttr();
2778  else
2780  break;
2782  Attr = MAI->getProtectedVisibilityAttr();
2783  break;
2784  }
2785 
2786  if (Attr != MCSA_Invalid)
2787  OutStreamer->EmitSymbolAttribute(Sym, Attr);
2788 }
2789 
2790 /// isBlockOnlyReachableByFallthough - Return true if the basic block has
2791 /// exactly one predecessor and the control transfer mechanism between
2792 /// the predecessor and this block is a fall-through.
2793 bool AsmPrinter::
2795  // If this is a landing pad, it isn't a fall through. If it has no preds,
2796  // then nothing falls through to it.
2797  if (MBB->isEHPad() || MBB->pred_empty())
2798  return false;
2799 
2800  // If there isn't exactly one predecessor, it can't be a fall through.
2801  if (MBB->pred_size() > 1)
2802  return false;
2803 
2804  // The predecessor has to be immediately before this block.
2805  MachineBasicBlock *Pred = *MBB->pred_begin();
2806  if (!Pred->isLayoutSuccessor(MBB))
2807  return false;
2808 
2809  // If the block is completely empty, then it definitely does fall through.
2810  if (Pred->empty())
2811  return true;
2812 
2813  // Check the terminators in the previous blocks
2814  for (const auto &MI : Pred->terminators()) {
2815  // If it is not a simple branch, we are in a table somewhere.
2816  if (!MI.isBranch() || MI.isIndirectBranch())
2817  return false;
2818 
2819  // If we are the operands of one of the branches, this is not a fall
2820  // through. Note that targets with delay slots will usually bundle
2821  // terminators with the delay slot instruction.
2822  for (ConstMIBundleOperands OP(MI); OP.isValid(); ++OP) {
2823  if (OP->isJTI())
2824  return false;
2825  if (OP->isMBB() && OP->getMBB() == MBB)
2826  return false;
2827  }
2828  }
2829 
2830  return true;
2831 }
2832 
2833 GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy &S) {
2834  if (!S.usesMetadata())
2835  return nullptr;
2836 
2837  assert(!S.useStatepoints() && "statepoints do not currently support custom"
2838  " stackmap formats, please see the documentation for a description of"
2839  " the default format. If you really need a custom serialized format,"
2840  " please file a bug");
2841 
2842  gcp_map_type &GCMap = getGCMap(GCMetadataPrinters);
2843  gcp_map_type::iterator GCPI = GCMap.find(&S);
2844  if (GCPI != GCMap.end())
2845  return GCPI->second.get();
2846 
2847  auto Name = S.getName();
2848 
2851  E = GCMetadataPrinterRegistry::end(); I != E; ++I)
2852  if (Name == I->getName()) {
2853  std::unique_ptr<GCMetadataPrinter> GMP = I->instantiate();
2854  GMP->S = &S;
2855  auto IterBool = GCMap.insert(std::make_pair(&S, std::move(GMP)));
2856  return IterBool.first->second.get();
2857  }
2858 
2859  report_fatal_error("no GCMetadataPrinter registered for GC: " + Twine(Name));
2860 }
2861 
2862 /// Pin vtable to this file.
2864 
2866 
2867 // In the binary's "xray_instr_map" section, an array of these function entries
2868 // describes each instrumentation point. When XRay patches your code, the index
2869 // into this table will be given to your handler as a patch point identifier.
2871  const MCSymbol *CurrentFnSym) const {
2872  Out->EmitSymbolValue(Sled, Bytes);
2873  Out->EmitSymbolValue(CurrentFnSym, Bytes);
2874  auto Kind8 = static_cast<uint8_t>(Kind);
2875  Out->EmitBinaryData(StringRef(reinterpret_cast<const char *>(&Kind8), 1));
2876  Out->EmitBinaryData(
2877  StringRef(reinterpret_cast<const char *>(&AlwaysInstrument), 1));
2878  Out->EmitBinaryData(StringRef(reinterpret_cast<const char *>(&Version), 1));
2879  auto Padding = (4 * Bytes) - ((2 * Bytes) + 3);
2880  assert(Padding >= 0 && "Instrumentation map entry > 4 * Word Size");
2881  Out->EmitZeros(Padding);
2882 }
2883 
2885  if (Sleds.empty())
2886  return;
2887 
2888  auto PrevSection = OutStreamer->getCurrentSectionOnly();
2889  const Function &F = MF->getFunction();
2890  MCSection *InstMap = nullptr;
2891  MCSection *FnSledIndex = nullptr;
2893  auto Associated = dyn_cast<MCSymbolELF>(CurrentFnSym);
2894  assert(Associated != nullptr);
2896  std::string GroupName;
2897  if (F.hasComdat()) {
2898  Flags |= ELF::SHF_GROUP;
2899  GroupName = F.getComdat()->getName();
2900  }
2901 
2902  auto UniqueID = ++XRayFnUniqueID;
2903  InstMap =
2904  OutContext.getELFSection("xray_instr_map", ELF::SHT_PROGBITS, Flags, 0,
2905  GroupName, UniqueID, Associated);
2906  FnSledIndex =
2907  OutContext.getELFSection("xray_fn_idx", ELF::SHT_PROGBITS, Flags, 0,
2908  GroupName, UniqueID, Associated);
2909  } else if (MF->getSubtarget().getTargetTriple().isOSBinFormatMachO()) {
2910  InstMap = OutContext.getMachOSection("__DATA", "xray_instr_map", 0,
2912  FnSledIndex = OutContext.getMachOSection("__DATA", "xray_fn_idx", 0,
2914  } else {
2915  llvm_unreachable("Unsupported target");
2916  }
2917 
2918  auto WordSizeBytes = MAI->getCodePointerSize();
2919 
2920  // Now we switch to the instrumentation map section. Because this is done
2921  // per-function, we are able to create an index entry that will represent the
2922  // range of sleds associated with a function.
2923  MCSymbol *SledsStart = OutContext.createTempSymbol("xray_sleds_start", true);
2924  OutStreamer->SwitchSection(InstMap);
2925  OutStreamer->EmitLabel(SledsStart);
2926  for (const auto &Sled : Sleds)
2927  Sled.emit(WordSizeBytes, OutStreamer.get(), CurrentFnSym);
2928  MCSymbol *SledsEnd = OutContext.createTempSymbol("xray_sleds_end", true);
2929  OutStreamer->EmitLabel(SledsEnd);
2930 
2931  // We then emit a single entry in the index per function. We use the symbols
2932  // that bound the instrumentation map as the range for a specific function.
2933  // Each entry here will be 2 * word size aligned, as we're writing down two
2934  // pointers. This should work for both 32-bit and 64-bit platforms.
2935  OutStreamer->SwitchSection(FnSledIndex);
2936  OutStreamer->EmitCodeAlignment(2 * WordSizeBytes);
2937  OutStreamer->EmitSymbolValue(SledsStart, WordSizeBytes, false);
2938  OutStreamer->EmitSymbolValue(SledsEnd, WordSizeBytes, false);
2939  OutStreamer->SwitchSection(PrevSection);
2940  Sleds.clear();
2941 }
2942 
2944  SledKind Kind, uint8_t Version) {
2945  const Function &F = MI.getMF()->getFunction();
2946  auto Attr = F.getFnAttribute("function-instrument");
2947  bool LogArgs = F.hasFnAttribute("xray-log-args");
2948  bool AlwaysInstrument =
2949  Attr.isStringAttribute() && Attr.getValueAsString() == "xray-always";
2950  if (Kind == SledKind::FUNCTION_ENTER && LogArgs)
2951  Kind = SledKind::LOG_ARGS_ENTER;
2952  Sleds.emplace_back(XRayFunctionEntry{Sled, CurrentFnSym, Kind,
2953  AlwaysInstrument, &F, Version});
2954 }
2955 
2957  return OutStreamer->getContext().getDwarfVersion();
2958 }
2959 
2961  OutStreamer->getContext().setDwarfVersion(Version);
2962 }
virtual void EmitGlobalVariable(const GlobalVariable *GV)
Emit the specified global variable to the .s file.
Definition: AsmPrinter.cpp:428
const Function & getFunction() const
Definition: Function.h:134
void setDwarfVersion(uint16_t Version)
bool isDeclarationForLinker() const
Definition: GlobalValue.h:523
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:208
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:509
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:111
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:569
MCSymbolAttr getHiddenVisibilityAttr() const
Definition: MCAsmInfo.h:539
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:435
unsigned getOpcode() const
Return the opcode at the root of this constant expression.
Definition: Constants.h:1176
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:131
MCTargetOptions MCOptions
Machine level options.
virtual MCSection * getStaticCtorSection(unsigned Priority, const MCSymbol *KeySym) const
bool hasPrivateLinkage() const
Definition: GlobalValue.h:434
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:145
bool isVariable() const
isVariable - Check if this is a variable symbol.
Definition: MCSymbol.h:294
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:2681
bool hasMachoTBSSDirective() const
Definition: MCAsmInfo.h:461
StringRef getPrivateGlobalPrefix() const
Definition: DataLayout.h:284
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:230
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:611
LLVM_ATTRIBUTE_ALWAYS_INLINE size_type size() const
Definition: SmallVector.h:136
bool doesSupportDebugInformation() const
Definition: MCAsmInfo.h:549
bool hasSingleParameterDotFile() const
Definition: MCAsmInfo.h:525
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:537
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:577
bool EnablePrintSchedInfo
Enable print [latency:throughput] in output.
Definition: AsmPrinter.h:118
const MCSubtargetInfo & getSubtargetInfo() const
Return information about subtarget.
Definition: AsmPrinter.cpp:220
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:911
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:422
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:524
bool needsDwarfSectionOffsetDirective() const
Definition: MCAsmInfo.h:454
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:2337
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:126
bool hasPrologueData() const
Check whether this function has prologue data.
Definition: Function.h:698
bool isAbsolute() const
Is this an absolute (as opposed to relocatable) value.
Definition: MCValue.h:53
static const char *const DWARFGroupName
Definition: AsmPrinter.cpp:128
bool hasFnAttribute(Attribute::AttrKind Kind) const
Return true if the function has the attribute.
Definition: Function.h:302
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:765
APInt zextOrTrunc(unsigned width) const
Zero extend or truncate to width.
Definition: APInt.cpp:884
virtual void emitLinkerFlagsForUsed(raw_ostream &OS, const GlobalValue *GV) const
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:807
static const char *const DWARFGroupDescription
Definition: AsmPrinter.cpp:129
bool isImm() const
isImm - Tests if this is a MO_Immediate operand.
bool hasIdentDirective() const
Definition: MCAsmInfo.h:526
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:148
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:460
WinEH::EncodingType getWinEHEncodingType() const
Definition: MCAsmInfo.h:556
virtual void EmitInstruction(const MCInst &Inst, const MCSubtargetInfo &STI, bool PrintSchedInfo=false)
Emit the given Instruction into the current section.
Definition: MCStreamer.cpp:874
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:1280
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:818
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:269
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:511
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:626
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:689
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:1554
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:370
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:2311
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:530
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:439
INLINEASM - Represents an inline asm block.
Definition: ISDOpcodes.h:635
Constant * getPrefixData() const
Get the prefix data associated with this function.
Definition: Function.cpp:1270
BlockT * getHeader() const
Definition: LoopInfo.h:100
static const char *const CodeViewLineTablesGroupName
Definition: AsmPrinter.cpp:136
unsigned getPointerSize() const
Return the pointer size from the TargetMachine.
Definition: AsmPrinter.cpp:218
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:61
auto reverse(ContainerTy &&C, typename std::enable_if< has_rbegin< ContainerTy >::value >::type *=nullptr) -> decltype(make_range(C.rbegin(), C.rend()))
Definition: STLExtras.h:233
bool hasExternalLinkage() const
Definition: GlobalValue.h:421
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:985
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:234
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:867
void EmitFunctionBody()
This method emits the body and trailer for a function.
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:570
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:199
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
union llvm::MachineConstantPoolEntry::@141 Val
The constant itself.
.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:845
bool isFPImm() const
isFPImm - Tests if this is a MO_FPImmediate operand.
bool hasFunctionAlignment() const
Definition: MCAsmInfo.h:523
bool hasPersonalityFn() const
Check whether this function has a personality function.
Definition: Function.h:680
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:450
virtual void EmitBinaryData(StringRef Data)
Functionally identical to EmitBytes.
Definition: MCStreamer.cpp:937
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:425
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:527
const std::string & str() const
Definition: Triple.h:354
Type * getElementType() const
Return the element type of the array/vector.
Definition: Constants.cpp:2307
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:370
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:432
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:415
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:824
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:733
unsigned getPreferredAlignmentLog(const GlobalVariable *GV) const
Returns the preferred alignment of the specified global, returned in log form.
Definition: DataLayout.cpp:825
#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:187
Streaming machine code generation interface.
Definition: MCStreamer.h:181
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:133
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:232
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.
virtual void emitLinkerFlagsForGlobal(raw_ostream &OS, const GlobalValue *GV) const
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:182
Metadata * getModuleFlag(StringRef Key) const
Return the corresponding value if Key appears in module flags, otherwise return null.
Definition: Module.cpp:302
MachineFrameInfo & getFrameInfo()
getFrameInfo - Return the frame info object for the current function.
bool needsLocalForSize() const
Definition: MCAsmInfo.h:475
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:620
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:418
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:576
bool hasWeakDefCanBeHiddenDirective() const
Definition: MCAsmInfo.h:533
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:360
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:519
const Triple & getTargetTriple() const
bool useAssignmentForEHBegin() const
Definition: MCAsmInfo.h:474
op_range operands()
Definition: User.h:222
bool hasLinkerPrivateGlobalPrefix() const
Definition: DataLayout.h:262
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:188
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:496
MachineConstantPool * getConstantPool()
getConstantPool - Return the constant pool object for the current function.
bool hasSubsectionsViaSymbols() const
Definition: MCAsmInfo.h:397
void emitFrameAlloc(const MachineInstr &MI)
Definition: AsmPrinter.cpp:951
.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:132
bool hasWeakDefDirective() const
Definition: MCAsmInfo.h:531
bool isSplat(unsigned SplatSizeInBits) const
Check if the APInt consists of a repeated bit pattern.
Definition: APInt.cpp:502
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:567
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:835
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:3580
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
MCSection * getDrectveSection() const
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:429
bool isBSS() const
Definition: SectionKind.h:160
const std::vector< MachineConstantPoolEntry > & getConstants() const
const APFloat & getValueAPF() const
Definition: Constants.h:299
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:204
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:926
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:795
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:137
MCSymbol * getSymbol(const GlobalValue *GV) const
Definition: AsmPrinter.cpp:423
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:257
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:862
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:2600
StringRef getAsString() const
If this array is isString(), then this method returns the array as a StringRef.
Definition: Constants.h:652
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:572
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:225
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:519
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:199
MCSymbolAttr
Definition: MCDirectives.h:19
void print(raw_ostream &OS, bool isSigned) const
Definition: APInt.cpp:2144
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:551
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.
bool isDefined() const
isDefined - Check if this symbol is defined (i.e., it has an address).
Definition: MCSymbol.h:248
Target - Wrapper for Target specific information.
Class for arbitrary precision integers.
Definition: APInt.h:69
ConstantArray - Constant Array Declarations.
Definition: Constants.h:410
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:471
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:429
MCSubtargetInfo * createMCSubtargetInfo(StringRef TheTriple, StringRef CPU, StringRef Features) const
createMCSubtargetInfo - Create a MCSubtargetInfo implementation.
FunctionNumber(functionNumber)
Definition: LLParser.cpp:2575
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:418
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 const char *const CFGuardName
Definition: AsmPrinter.cpp:134
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:243
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:533
SequentialType * getType() const
Specialize the getType() method to always return a SequentialType, which reduces the amount of castin...
Definition: Constants.h:629
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:3475
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:518
.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:224
TargetOptions Options
Definition: TargetMachine.h:98
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.
static bool emitComments(const MachineInstr &MI, raw_ostream &CommentOS, AsmPrinter *AP)
emitComments - Pretty-print comments for instructions.
Definition: AsmPrinter.cpp:737
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:150
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
static const char *const CFGuardDescription
Definition: AsmPrinter.cpp:135
std::string getSchedInfoStr(const MachineInstr &MI) const override
Returns string representation of scheduler comment.
bool hasAltEntry() const
Definition: MCAsmInfo.h:528
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:159
virtual void EmitFunctionEntryLabel()
EmitFunctionEntryLabel - Emit the label that is the entrypoint for the function.
Definition: AsmPrinter.cpp:719
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:383
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:384
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:565
LLVM Value Representation.
Definition: Value.h:73
Constant * getPersonalityFn() const
Get the personality function associated with this function.
Definition: Function.cpp:1260
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:401
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:130
#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:555
Attribute getFnAttribute(Attribute::AttrKind Kind) const
Return the attribute for the given attribute kind.
Definition: Function.h:312
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:59
uint64_t getTypeAllocSizeInBits(Type *Ty) const
Returns the offset in bits between successive objects of the specified type, including alignment padd...
Definition: DataLayout.h:428
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:212
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:246
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:2330
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:220
const MCSection * getCurrentSection() const
Return the current section we are emitting to.
Definition: AsmPrinter.cpp:230
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:541
static SectionKind getReadOnly()
Definition: SectionKind.h:182
MCSymbol * createTempSymbol(const Twine &Name) const
MCSymbolAttr getProtectedVisibilityAttr() const
Definition: MCAsmInfo.h:545
StructType * getType() const
Specialization - reduce amount of casting.
Definition: Constants.h:483
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:961
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:273
.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:2689
MCSubtargetInfo & getSubtargetCopy(const MCSubtargetInfo &STI)
Definition: MCContext.cpp:527