LLVM  8.0.0svn
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"
35 #include "llvm/BinaryFormat/COFF.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/MCSectionCOFF.h"
92 #include "llvm/MC/MCSectionELF.h"
93 #include "llvm/MC/MCSectionMachO.h"
94 #include "llvm/MC/MCStreamer.h"
96 #include "llvm/MC/MCSymbol.h"
97 #include "llvm/MC/MCSymbolELF.h"
99 #include "llvm/MC/MCValue.h"
100 #include "llvm/MC/SectionKind.h"
101 #include "llvm/Pass.h"
102 #include "llvm/Support/Casting.h"
104 #include "llvm/Support/Compiler.h"
106 #include "llvm/Support/Format.h"
107 #include "llvm/Support/MathExtras.h"
108 #include "llvm/Support/Path.h"
110 #include "llvm/Support/Timer.h"
115 #include <algorithm>
116 #include <cassert>
117 #include <cinttypes>
118 #include <cstdint>
119 #include <iterator>
120 #include <limits>
121 #include <memory>
122 #include <string>
123 #include <utility>
124 #include <vector>
125 
126 using namespace llvm;
127 
128 #define DEBUG_TYPE "asm-printer"
129 
130 static const char *const DWARFGroupName = "dwarf";
131 static const char *const DWARFGroupDescription = "DWARF Emission";
132 static const char *const DbgTimerName = "emit";
133 static const char *const DbgTimerDescription = "Debug Info Emission";
134 static const char *const EHTimerName = "write_exception";
135 static const char *const EHTimerDescription = "DWARF Exception Writer";
136 static const char *const CFGuardName = "Control Flow Guard";
137 static const char *const CFGuardDescription = "Control Flow Guard Tables";
138 static const char *const CodeViewLineTablesGroupName = "linetables";
139 static const char *const CodeViewLineTablesGroupDescription =
140  "CodeView Line Tables";
141 
142 STATISTIC(EmittedInsts, "Number of machine instrs printed");
143 
144 static cl::opt<bool>
145  PrintSchedule("print-schedule", cl::Hidden, cl::init(false),
146  cl::desc("Print 'sched: [latency:throughput]' in .s output"));
147 
148 char AsmPrinter::ID = 0;
149 
151 
152 static gcp_map_type &getGCMap(void *&P) {
153  if (!P)
154  P = new gcp_map_type();
155  return *(gcp_map_type*)P;
156 }
157 
158 /// getGVAlignmentLog2 - Return the alignment to use for the specified global
159 /// value in log2 form. This rounds up to the preferred alignment if possible
160 /// and legal.
161 static unsigned getGVAlignmentLog2(const GlobalValue *GV, const DataLayout &DL,
162  unsigned InBits = 0) {
163  unsigned NumBits = 0;
164  if (const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV))
165  NumBits = DL.getPreferredAlignmentLog(GVar);
166 
167  // If InBits is specified, round it to it.
168  if (InBits > NumBits)
169  NumBits = InBits;
170 
171  // If the GV has a specified alignment, take it into account.
172  if (GV->getAlignment() == 0)
173  return NumBits;
174 
175  unsigned GVAlign = Log2_32(GV->getAlignment());
176 
177  // If the GVAlign is larger than NumBits, or if we are required to obey
178  // NumBits because the GV has an assigned section, obey it.
179  if (GVAlign > NumBits || GV->hasSection())
180  NumBits = GVAlign;
181  return NumBits;
182 }
183 
184 AsmPrinter::AsmPrinter(TargetMachine &tm, std::unique_ptr<MCStreamer> Streamer)
185  : MachineFunctionPass(ID), TM(tm), MAI(tm.getMCAsmInfo()),
186  OutContext(Streamer->getContext()), OutStreamer(std::move(Streamer)) {
187  VerboseAsm = OutStreamer->isVerboseAsm();
188 }
189 
191  assert(!DD && Handlers.empty() && "Debug/EH info didn't get finalized");
192 
193  if (GCMetadataPrinters) {
194  gcp_map_type &GCMap = getGCMap(GCMetadataPrinters);
195 
196  delete &GCMap;
197  GCMetadataPrinters = nullptr;
198  }
199 }
200 
202  return TM.isPositionIndependent();
203 }
204 
205 /// getFunctionNumber - Return a unique ID for the current function.
207  return MF->getFunctionNumber();
208 }
209 
211  return *TM.getObjFileLowering();
212 }
213 
215  return MMI->getModule()->getDataLayout();
216 }
217 
218 // Do not use the cached DataLayout because some client use it without a Module
219 // (dsymutil, llvm-dwarfdump).
220 unsigned AsmPrinter::getPointerSize() const {
221  return TM.getPointerSize(0); // FIXME: Default address space
222 }
223 
225  assert(MF && "getSubtargetInfo requires a valid MachineFunction!");
226  return MF->getSubtarget<MCSubtargetInfo>();
227 }
228 
231 }
232 
233 /// getCurrentSection() - Return the current section we are emitting to.
235  return OutStreamer->getCurrentSectionOnly();
236 }
237 
239  AU.setPreservesAll();
244 }
245 
247  MMI = getAnalysisIfAvailable<MachineModuleInfo>();
248 
249  // Initialize TargetLoweringObjectFile.
251  .Initialize(OutContext, TM);
252 
253  OutStreamer->InitSections(false);
254 
255  // Emit the version-min deployment target directive if needed.
256  //
257  // FIXME: If we end up with a collection of these sorts of Darwin-specific
258  // or ELF-specific things, it may make sense to have a platform helper class
259  // that will work with the target helper class. For now keep it here, as the
260  // alternative is duplicated code in each of the target asm printers that
261  // use the directive, where it would need the same conditionalization
262  // anyway.
263  const Triple &Target = TM.getTargetTriple();
264  OutStreamer->EmitVersionForTarget(Target);
265 
266  // Allow the target to emit any magic that it wants at the start of the file.
268 
269  // Very minimal debug info. It is ignored if we emit actual debug info. If we
270  // don't, this at least helps the user find where a global came from.
272  // .file "foo.c"
273  OutStreamer->EmitFileDirective(
275  }
276 
277  GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
278  assert(MI && "AsmPrinter didn't require GCModuleInfo?");
279  for (auto &I : *MI)
280  if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I))
281  MP->beginAssembly(M, *MI, *this);
282 
283  // Emit module-level inline asm if it exists.
284  if (!M.getModuleInlineAsm().empty()) {
285  // We're at the module level. Construct MCSubtarget from the default CPU
286  // and target triple.
287  std::unique_ptr<MCSubtargetInfo> STI(TM.getTarget().createMCSubtargetInfo(
290  OutStreamer->AddComment("Start of file scope inline assembly");
291  OutStreamer->AddBlankLine();
292  EmitInlineAsm(M.getModuleInlineAsm()+"\n",
294  OutStreamer->AddComment("End of file scope inline assembly");
295  OutStreamer->AddBlankLine();
296  }
297 
299  bool EmitCodeView = MMI->getModule()->getCodeViewFlag();
300  if (EmitCodeView && TM.getTargetTriple().isOSWindows()) {
301  Handlers.push_back(HandlerInfo(new CodeViewDebug(this),
302  DbgTimerName, DbgTimerDescription,
303  CodeViewLineTablesGroupName,
304  CodeViewLineTablesGroupDescription));
305  }
306  if (!EmitCodeView || MMI->getModule()->getDwarfVersion()) {
307  DD = new DwarfDebug(this, &M);
308  DD->beginModule();
309  Handlers.push_back(HandlerInfo(DD, DbgTimerName, DbgTimerDescription,
310  DWARFGroupName, DWARFGroupDescription));
311  }
312  }
313 
314  switch (MAI->getExceptionHandlingType()) {
318  isCFIMoveForDebugging = true;
320  break;
321  for (auto &F: M.getFunctionList()) {
322  // If the module contains any function with unwind data,
323  // .eh_frame has to be emitted.
324  // Ignore functions that won't get emitted.
325  if (!F.isDeclarationForLinker() && F.needsUnwindTableEntry()) {
326  isCFIMoveForDebugging = false;
327  break;
328  }
329  }
330  break;
331  default:
332  isCFIMoveForDebugging = false;
333  break;
334  }
335 
336  EHStreamer *ES = nullptr;
337  switch (MAI->getExceptionHandlingType()) {
339  break;
342  ES = new DwarfCFIException(this);
343  break;
345  ES = new ARMException(this);
346  break;
348  switch (MAI->getWinEHEncodingType()) {
349  default: llvm_unreachable("unsupported unwinding information encoding");
351  break;
354  ES = new WinException(this);
355  break;
356  }
357  break;
359  // TODO to prevent warning
360  break;
361  }
362  if (ES)
363  Handlers.push_back(HandlerInfo(ES, EHTimerName, EHTimerDescription,
364  DWARFGroupName, DWARFGroupDescription));
365 
366  if (mdconst::extract_or_null<ConstantInt>(
367  MMI->getModule()->getModuleFlag("cfguardtable")))
368  Handlers.push_back(HandlerInfo(new WinCFGuard(this), CFGuardName,
369  CFGuardDescription, DWARFGroupName,
370  DWARFGroupDescription));
371 
372  return false;
373 }
374 
375 static bool canBeHidden(const GlobalValue *GV, const MCAsmInfo &MAI) {
377  return false;
378 
379  return GV->canBeOmittedFromSymbolTable();
380 }
381 
382 void AsmPrinter::EmitLinkage(const GlobalValue *GV, MCSymbol *GVSym) const {
383  GlobalValue::LinkageTypes Linkage = GV->getLinkage();
384  switch (Linkage) {
390  if (MAI->hasWeakDefDirective()) {
391  // .globl _foo
392  OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Global);
393 
394  if (!canBeHidden(GV, *MAI))
395  // .weak_definition _foo
396  OutStreamer->EmitSymbolAttribute(GVSym, MCSA_WeakDefinition);
397  else
398  OutStreamer->EmitSymbolAttribute(GVSym, MCSA_WeakDefAutoPrivate);
399  } else if (MAI->hasLinkOnceDirective()) {
400  // .globl _foo
401  OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Global);
402  //NOTE: linkonce is handled by the section the symbol was assigned to.
403  } else {
404  // .weak _foo
405  OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Weak);
406  }
407  return;
409  // If external, declare as a global symbol: .globl _foo
410  OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Global);
411  return;
414  return;
418  llvm_unreachable("Should never emit this");
419  }
420  llvm_unreachable("Unknown linkage type!");
421 }
422 
424  const GlobalValue *GV) const {
425  TM.getNameWithPrefix(Name, GV, getObjFileLowering().getMangler());
426 }
427 
429  return TM.getSymbol(GV);
430 }
431 
432 /// EmitGlobalVariable - Emit the specified global variable to the .s file.
434  bool IsEmuTLSVar = TM.useEmulatedTLS() && GV->isThreadLocal();
435  assert(!(IsEmuTLSVar && GV->hasCommonLinkage()) &&
436  "No emulated TLS variables in the common section");
437 
438  // Never emit TLS variable xyz in emulated TLS model.
439  // The initialization value is in __emutls_t.xyz instead of xyz.
440  if (IsEmuTLSVar)
441  return;
442 
443  if (GV->hasInitializer()) {
444  // Check to see if this is a special global used by LLVM, if so, emit it.
445  if (EmitSpecialLLVMGlobal(GV))
446  return;
447 
448  // Skip the emission of global equivalents. The symbol can be emitted later
449  // on by emitGlobalGOTEquivs in case it turns out to be needed.
450  if (GlobalGOTEquivs.count(getSymbol(GV)))
451  return;
452 
453  if (isVerbose()) {
454  // When printing the control variable __emutls_v.*,
455  // we don't need to print the original TLS variable name.
456  GV->printAsOperand(OutStreamer->GetCommentOS(),
457  /*PrintType=*/false, GV->getParent());
458  OutStreamer->GetCommentOS() << '\n';
459  }
460  }
461 
462  MCSymbol *GVSym = getSymbol(GV);
463  MCSymbol *EmittedSym = GVSym;
464 
465  // getOrCreateEmuTLSControlSym only creates the symbol with name and default
466  // attributes.
467  // GV's or GVSym's attributes will be used for the EmittedSym.
468  EmitVisibility(EmittedSym, GV->getVisibility(), !GV->isDeclaration());
469 
470  if (!GV->hasInitializer()) // External globals require no extra code.
471  return;
472 
473  GVSym->redefineIfPossible();
474  if (GVSym->isDefined() || GVSym->isVariable())
475  report_fatal_error("symbol '" + Twine(GVSym->getName()) +
476  "' is already defined");
477 
479  OutStreamer->EmitSymbolAttribute(EmittedSym, MCSA_ELF_TypeObject);
480 
482 
483  const DataLayout &DL = GV->getParent()->getDataLayout();
484  uint64_t Size = DL.getTypeAllocSize(GV->getType()->getElementType());
485 
486  // If the alignment is specified, we *must* obey it. Overaligning a global
487  // with a specified alignment is a prompt way to break globals emitted to
488  // sections and expected to be contiguous (e.g. ObjC metadata).
489  unsigned AlignLog = getGVAlignmentLog2(GV, DL);
490 
491  for (const HandlerInfo &HI : Handlers) {
492  NamedRegionTimer T(HI.TimerName, HI.TimerDescription,
493  HI.TimerGroupName, HI.TimerGroupDescription,
495  HI.Handler->setSymbolSize(GVSym, Size);
496  }
497 
498  // Handle common symbols
499  if (GVKind.isCommon()) {
500  if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
501  unsigned Align = 1 << AlignLog;
503  Align = 0;
504 
505  // .comm _foo, 42, 4
506  OutStreamer->EmitCommonSymbol(GVSym, Size, Align);
507  return;
508  }
509 
510  // Determine to which section this global should be emitted.
511  MCSection *TheSection = getObjFileLowering().SectionForGlobal(GV, GVKind, TM);
512 
513  // If we have a bss global going to a section that supports the
514  // zerofill directive, do so here.
515  if (GVKind.isBSS() && MAI->hasMachoZeroFillDirective() &&
516  TheSection->isVirtualSection()) {
517  if (Size == 0)
518  Size = 1; // zerofill of 0 bytes is undefined.
519  unsigned Align = 1 << AlignLog;
520  EmitLinkage(GV, GVSym);
521  // .zerofill __DATA, __bss, _foo, 400, 5
522  OutStreamer->EmitZerofill(TheSection, GVSym, Size, Align);
523  return;
524  }
525 
526  // If this is a BSS local symbol and we are emitting in the BSS
527  // section use .lcomm/.comm directive.
528  if (GVKind.isBSSLocal() &&
529  getObjFileLowering().getBSSSection() == TheSection) {
530  if (Size == 0)
531  Size = 1; // .comm Foo, 0 is undefined, avoid it.
532  unsigned Align = 1 << AlignLog;
533 
534  // Use .lcomm only if it supports user-specified alignment.
535  // Otherwise, while it would still be correct to use .lcomm in some
536  // cases (e.g. when Align == 1), the external assembler might enfore
537  // some -unknown- default alignment behavior, which could cause
538  // spurious differences between external and integrated assembler.
539  // Prefer to simply fall back to .local / .comm in this case.
541  // .lcomm _foo, 42
542  OutStreamer->EmitLocalCommonSymbol(GVSym, Size, Align);
543  return;
544  }
545 
546  if (!getObjFileLowering().getCommDirectiveSupportsAlignment())
547  Align = 0;
548 
549  // .local _foo
550  OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Local);
551  // .comm _foo, 42, 4
552  OutStreamer->EmitCommonSymbol(GVSym, Size, Align);
553  return;
554  }
555 
556  // Handle thread local data for mach-o which requires us to output an
557  // additional structure of data and mangle the original symbol so that we
558  // can reference it later.
559  //
560  // TODO: This should become an "emit thread local global" method on TLOF.
561  // All of this macho specific stuff should be sunk down into TLOFMachO and
562  // stuff like "TLSExtraDataSection" should no longer be part of the parent
563  // TLOF class. This will also make it more obvious that stuff like
564  // MCStreamer::EmitTBSSSymbol is macho specific and only called from macho
565  // specific code.
566  if (GVKind.isThreadLocal() && MAI->hasMachoTBSSDirective()) {
567  // Emit the .tbss symbol
568  MCSymbol *MangSym =
569  OutContext.getOrCreateSymbol(GVSym->getName() + Twine("$tlv$init"));
570 
571  if (GVKind.isThreadBSS()) {
572  TheSection = getObjFileLowering().getTLSBSSSection();
573  OutStreamer->EmitTBSSSymbol(TheSection, MangSym, Size, 1 << AlignLog);
574  } else if (GVKind.isThreadData()) {
575  OutStreamer->SwitchSection(TheSection);
576 
577  EmitAlignment(AlignLog, GV);
578  OutStreamer->EmitLabel(MangSym);
579 
581  GV->getInitializer());
582  }
583 
584  OutStreamer->AddBlankLine();
585 
586  // Emit the variable struct for the runtime.
588 
589  OutStreamer->SwitchSection(TLVSect);
590  // Emit the linkage here.
591  EmitLinkage(GV, GVSym);
592  OutStreamer->EmitLabel(GVSym);
593 
594  // Three pointers in size:
595  // - __tlv_bootstrap - used to make sure support exists
596  // - spare pointer, used when mapped by the runtime
597  // - pointer to mangled symbol above with initializer
598  unsigned PtrSize = DL.getPointerTypeSize(GV->getType());
599  OutStreamer->EmitSymbolValue(GetExternalSymbolSymbol("_tlv_bootstrap"),
600  PtrSize);
601  OutStreamer->EmitIntValue(0, PtrSize);
602  OutStreamer->EmitSymbolValue(MangSym, PtrSize);
603 
604  OutStreamer->AddBlankLine();
605  return;
606  }
607 
608  MCSymbol *EmittedInitSym = GVSym;
609 
610  OutStreamer->SwitchSection(TheSection);
611 
612  EmitLinkage(GV, EmittedInitSym);
613  EmitAlignment(AlignLog, GV);
614 
615  OutStreamer->EmitLabel(EmittedInitSym);
616 
618 
620  // .size foo, 42
621  OutStreamer->emitELFSize(EmittedInitSym,
623 
624  OutStreamer->AddBlankLine();
625 }
626 
627 /// Emit the directive and value for debug thread local expression
628 ///
629 /// \p Value - The value to emit.
630 /// \p Size - The size of the integer (in bytes) to emit.
632  unsigned Size) const {
633  OutStreamer->EmitValue(Value, Size);
634 }
635 
636 /// EmitFunctionHeader - This method emits the header for the current
637 /// function.
638 void AsmPrinter::EmitFunctionHeader() {
639  const Function &F = MF->getFunction();
640 
641  if (isVerbose())
642  OutStreamer->GetCommentOS()
643  << "-- Begin function "
645 
646  // Print out constants referenced by the function
648 
649  // Print the 'header' of function.
650  OutStreamer->SwitchSection(getObjFileLowering().SectionForGlobal(&F, TM));
651  EmitVisibility(CurrentFnSym, F.getVisibility());
652 
653  EmitLinkage(&F, CurrentFnSym);
654  if (MAI->hasFunctionAlignment())
656 
658  OutStreamer->EmitSymbolAttribute(CurrentFnSym, MCSA_ELF_TypeFunction);
659 
660  if (isVerbose()) {
661  F.printAsOperand(OutStreamer->GetCommentOS(),
662  /*PrintType=*/false, F.getParent());
663  OutStreamer->GetCommentOS() << '\n';
664  }
665 
666  // Emit the prefix data.
667  if (F.hasPrefixData()) {
668  if (MAI->hasSubsectionsViaSymbols()) {
669  // Preserving prefix data on platforms which use subsections-via-symbols
670  // is a bit tricky. Here we introduce a symbol for the prefix data
671  // and use the .alt_entry attribute to mark the function's real entry point
672  // as an alternative entry point to the prefix-data symbol.
674  OutStreamer->EmitLabel(PrefixSym);
675 
677 
678  // Emit an .alt_entry directive for the actual function symbol.
679  OutStreamer->EmitSymbolAttribute(CurrentFnSym, MCSA_AltEntry);
680  } else {
682  }
683  }
684 
685  // Emit the CurrentFnSym. This is a virtual function to allow targets to
686  // do their wild and crazy things as required.
688 
689  // If the function had address-taken blocks that got deleted, then we have
690  // references to the dangling symbols. Emit them at the start of the function
691  // so that we don't get references to undefined symbols.
692  std::vector<MCSymbol*> DeadBlockSyms;
693  MMI->takeDeletedSymbolsForFunction(&F, DeadBlockSyms);
694  for (unsigned i = 0, e = DeadBlockSyms.size(); i != e; ++i) {
695  OutStreamer->AddComment("Address taken block that was later removed");
696  OutStreamer->EmitLabel(DeadBlockSyms[i]);
697  }
698 
699  if (CurrentFnBegin) {
700  if (MAI->useAssignmentForEHBegin()) {
702  OutStreamer->EmitLabel(CurPos);
703  OutStreamer->EmitAssignment(CurrentFnBegin,
705  } else {
706  OutStreamer->EmitLabel(CurrentFnBegin);
707  }
708  }
709 
710  // Emit pre-function debug and/or EH information.
711  for (const HandlerInfo &HI : Handlers) {
712  NamedRegionTimer T(HI.TimerName, HI.TimerDescription, HI.TimerGroupName,
713  HI.TimerGroupDescription, TimePassesIsEnabled);
714  HI.Handler->beginFunction(MF);
715  }
716 
717  // Emit the prologue data.
718  if (F.hasPrologueData())
720 }
721 
722 /// EmitFunctionEntryLabel - Emit the label that is the entrypoint for the
723 /// function. This can be overridden by targets as required to do custom stuff.
726 
727  // The function label could have already been emitted if two symbols end up
728  // conflicting due to asm renaming. Detect this and emit an error.
729  if (CurrentFnSym->isVariable())
731  "' is a protected alias");
732  if (CurrentFnSym->isDefined())
734  "' label emitted multiple times to assembly file");
735 
736  return OutStreamer->EmitLabel(CurrentFnSym);
737 }
738 
739 /// emitComments - Pretty-print comments for instructions.
740 /// It returns true iff the sched comment was emitted.
741 /// Otherwise it returns false.
742 static bool emitComments(const MachineInstr &MI, raw_ostream &CommentOS,
743  AsmPrinter *AP) {
744  const MachineFunction *MF = MI.getMF();
745  const TargetInstrInfo *TII = MF->getSubtarget().getInstrInfo();
746 
747  // Check for spills and reloads
748  int FI;
749 
750  const MachineFrameInfo &MFI = MF->getFrameInfo();
751  bool Commented = false;
752 
753  auto getSize =
754  [&MFI](const SmallVectorImpl<const MachineMemOperand *> &Accesses) {
755  unsigned Size = 0;
756  for (auto A : Accesses)
757  if (MFI.isSpillSlotObjectIndex(
758  cast<FixedStackPseudoSourceValue>(A->getPseudoValue())
759  ->getFrameIndex()))
760  Size += A->getSize();
761  return Size;
762  };
763 
764  // We assume a single instruction only has a spill or reload, not
765  // both.
766  const MachineMemOperand *MMO;
768  if (TII->isLoadFromStackSlotPostFE(MI, FI)) {
769  if (MFI.isSpillSlotObjectIndex(FI)) {
770  MMO = *MI.memoperands_begin();
771  CommentOS << MMO->getSize() << "-byte Reload";
772  Commented = true;
773  }
774  } else if (TII->hasLoadFromStackSlot(MI, Accesses)) {
775  if (auto Size = getSize(Accesses)) {
776  CommentOS << Size << "-byte Folded Reload";
777  Commented = true;
778  }
779  } else if (TII->isStoreToStackSlotPostFE(MI, FI)) {
780  if (MFI.isSpillSlotObjectIndex(FI)) {
781  MMO = *MI.memoperands_begin();
782  CommentOS << MMO->getSize() << "-byte Spill";
783  Commented = true;
784  }
785  } else if (TII->hasStoreToStackSlot(MI, Accesses)) {
786  if (auto Size = getSize(Accesses)) {
787  CommentOS << Size << "-byte Folded Spill";
788  Commented = true;
789  }
790  }
791 
792  // Check for spill-induced copies
794  Commented = true;
795  CommentOS << " Reload Reuse";
796  }
797 
798  if (Commented) {
799  if (AP->EnablePrintSchedInfo) {
800  // If any comment was added above and we need sched info comment then add
801  // this new comment just after the above comment w/o "\n" between them.
802  CommentOS << " " << MF->getSubtarget().getSchedInfoStr(MI) << "\n";
803  return true;
804  }
805  CommentOS << "\n";
806  }
807  return false;
808 }
809 
810 /// emitImplicitDef - This method emits the specified machine instruction
811 /// that is an implicit def.
813  unsigned RegNo = MI->getOperand(0).getReg();
814 
815  SmallString<128> Str;
816  raw_svector_ostream OS(Str);
817  OS << "implicit-def: "
818  << printReg(RegNo, MF->getSubtarget().getRegisterInfo());
819 
820  OutStreamer->AddComment(OS.str());
821  OutStreamer->AddBlankLine();
822 }
823 
824 static void emitKill(const MachineInstr *MI, AsmPrinter &AP) {
825  std::string Str;
826  raw_string_ostream OS(Str);
827  OS << "kill:";
828  for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
829  const MachineOperand &Op = MI->getOperand(i);
830  assert(Op.isReg() && "KILL instruction must have only register operands");
831  OS << ' ' << (Op.isDef() ? "def " : "killed ")
832  << printReg(Op.getReg(), AP.MF->getSubtarget().getRegisterInfo());
833  }
834  AP.OutStreamer->AddComment(OS.str());
835  AP.OutStreamer->AddBlankLine();
836 }
837 
838 /// emitDebugValueComment - This method handles the target-independent form
839 /// of DBG_VALUE, returning true if it was able to do so. A false return
840 /// means the target will need to handle MI in EmitInstruction.
842  // This code handles only the 4-operand target-independent form.
843  if (MI->getNumOperands() != 4)
844  return false;
845 
846  SmallString<128> Str;
847  raw_svector_ostream OS(Str);
848  OS << "DEBUG_VALUE: ";
849 
850  const DILocalVariable *V = MI->getDebugVariable();
851  if (auto *SP = dyn_cast<DISubprogram>(V->getScope())) {
852  StringRef Name = SP->getName();
853  if (!Name.empty())
854  OS << Name << ":";
855  }
856  OS << V->getName();
857  OS << " <- ";
858 
859  // The second operand is only an offset if it's an immediate.
860  bool MemLoc = MI->getOperand(0).isReg() && MI->getOperand(1).isImm();
861  int64_t Offset = MemLoc ? MI->getOperand(1).getImm() : 0;
862  const DIExpression *Expr = MI->getDebugExpression();
863  if (Expr->getNumElements()) {
864  OS << '[';
865  bool NeedSep = false;
866  for (auto Op : Expr->expr_ops()) {
867  if (NeedSep)
868  OS << ", ";
869  else
870  NeedSep = true;
871  OS << dwarf::OperationEncodingString(Op.getOp());
872  for (unsigned I = 0; I < Op.getNumArgs(); ++I)
873  OS << ' ' << Op.getArg(I);
874  }
875  OS << "] ";
876  }
877 
878  // Register or immediate value. Register 0 means undef.
879  if (MI->getOperand(0).isFPImm()) {
880  APFloat APF = APFloat(MI->getOperand(0).getFPImm()->getValueAPF());
881  if (MI->getOperand(0).getFPImm()->getType()->isFloatTy()) {
882  OS << (double)APF.convertToFloat();
883  } else if (MI->getOperand(0).getFPImm()->getType()->isDoubleTy()) {
884  OS << APF.convertToDouble();
885  } else {
886  // There is no good way to print long double. Convert a copy to
887  // double. Ah well, it's only a comment.
888  bool ignored;
890  &ignored);
891  OS << "(long double) " << APF.convertToDouble();
892  }
893  } else if (MI->getOperand(0).isImm()) {
894  OS << MI->getOperand(0).getImm();
895  } else if (MI->getOperand(0).isCImm()) {
896  MI->getOperand(0).getCImm()->getValue().print(OS, false /*isSigned*/);
897  } else {
898  unsigned Reg;
899  if (MI->getOperand(0).isReg()) {
900  Reg = MI->getOperand(0).getReg();
901  } else {
902  assert(MI->getOperand(0).isFI() && "Unknown operand type");
904  Offset += TFI->getFrameIndexReference(*AP.MF,
905  MI->getOperand(0).getIndex(), Reg);
906  MemLoc = true;
907  }
908  if (Reg == 0) {
909  // Suppress offset, it is not meaningful here.
910  OS << "undef";
911  // NOTE: Want this comment at start of line, don't emit with AddComment.
912  AP.OutStreamer->emitRawComment(OS.str());
913  return true;
914  }
915  if (MemLoc)
916  OS << '[';
917  OS << printReg(Reg, AP.MF->getSubtarget().getRegisterInfo());
918  }
919 
920  if (MemLoc)
921  OS << '+' << Offset << ']';
922 
923  // NOTE: Want this comment at start of line, don't emit with AddComment.
924  AP.OutStreamer->emitRawComment(OS.str());
925  return true;
926 }
927 
928 /// This method handles the target-independent form of DBG_LABEL, returning
929 /// true if it was able to do so. A false return means the target will need
930 /// to handle MI in EmitInstruction.
932  if (MI->getNumOperands() != 1)
933  return false;
934 
935  SmallString<128> Str;
936  raw_svector_ostream OS(Str);
937  OS << "DEBUG_LABEL: ";
938 
939  const DILabel *V = MI->getDebugLabel();
940  if (auto *SP = dyn_cast<DISubprogram>(V->getScope())) {
941  StringRef Name = SP->getName();
942  if (!Name.empty())
943  OS << Name << ":";
944  }
945  OS << V->getName();
946 
947  // NOTE: Want this comment at start of line, don't emit with AddComment.
948  AP.OutStreamer->emitRawComment(OS.str());
949  return true;
950 }
951 
955  return CFI_M_EH;
956 
957  if (MMI->hasDebugInfo())
958  return CFI_M_Debug;
959 
960  return CFI_M_None;
961 }
962 
965 }
966 
968  ExceptionHandling ExceptionHandlingType = MAI->getExceptionHandlingType();
969  if (ExceptionHandlingType != ExceptionHandling::DwarfCFI &&
970  ExceptionHandlingType != ExceptionHandling::ARM)
971  return;
972 
973  if (needsCFIMoves() == CFI_M_None)
974  return;
975 
976  // If there is no "real" instruction following this CFI instruction, skip
977  // emitting it; it would be beyond the end of the function's FDE range.
978  auto *MBB = MI.getParent();
979  auto I = std::next(MI.getIterator());
980  while (I != MBB->end() && I->isTransient())
981  ++I;
982  if (I == MBB->instr_end() &&
983  MBB->getReverseIterator() == MBB->getParent()->rbegin())
984  return;
985 
986  const std::vector<MCCFIInstruction> &Instrs = MF->getFrameInstructions();
987  unsigned CFIIndex = MI.getOperand(0).getCFIIndex();
988  const MCCFIInstruction &CFI = Instrs[CFIIndex];
989  emitCFIInstruction(CFI);
990 }
991 
993  // The operands are the MCSymbol and the frame offset of the allocation.
994  MCSymbol *FrameAllocSym = MI.getOperand(0).getMCSymbol();
995  int FrameOffset = MI.getOperand(1).getImm();
996 
997  // Emit a symbol assignment.
998  OutStreamer->EmitAssignment(FrameAllocSym,
999  MCConstantExpr::create(FrameOffset, OutContext));
1000 }
1001 
1004  return;
1005 
1006  MCSection *StackSizeSection =
1008  if (!StackSizeSection)
1009  return;
1010 
1011  const MachineFrameInfo &FrameInfo = MF.getFrameInfo();
1012  // Don't emit functions with dynamic stack allocations.
1013  if (FrameInfo.hasVarSizedObjects())
1014  return;
1015 
1016  OutStreamer->PushSection();
1017  OutStreamer->SwitchSection(StackSizeSection);
1018 
1019  const MCSymbol *FunctionSymbol = getFunctionBegin();
1020  uint64_t StackSize = FrameInfo.getStackSize();
1021  OutStreamer->EmitSymbolValue(FunctionSymbol, TM.getProgramPointerSize());
1022  OutStreamer->EmitULEB128IntValue(StackSize);
1023 
1024  OutStreamer->PopSection();
1025 }
1026 
1029  if (!MF.getLandingPads().empty() || MF.hasEHFunclets() || MMI->hasDebugInfo())
1030  return true;
1031 
1032  // We might emit an EH table that uses function begin and end labels even if
1033  // we don't have any landingpads.
1034  if (!MF.getFunction().hasPersonalityFn())
1035  return false;
1036  return !isNoOpWithoutInvoke(
1038 }
1039 
1040 /// EmitFunctionBody - This method emits the body and trailer for a
1041 /// function.
1043  EmitFunctionHeader();
1044 
1045  // Emit target-specific gunk before the function body.
1047 
1048  bool ShouldPrintDebugScopes = MMI->hasDebugInfo();
1049 
1050  if (isVerbose()) {
1051  // Get MachineDominatorTree or compute it on the fly if it's unavailable
1052  MDT = getAnalysisIfAvailable<MachineDominatorTree>();
1053  if (!MDT) {
1054  OwnedMDT = make_unique<MachineDominatorTree>();
1055  OwnedMDT->getBase().recalculate(*MF);
1056  MDT = OwnedMDT.get();
1057  }
1058 
1059  // Get MachineLoopInfo or compute it on the fly if it's unavailable
1060  MLI = getAnalysisIfAvailable<MachineLoopInfo>();
1061  if (!MLI) {
1062  OwnedMLI = make_unique<MachineLoopInfo>();
1063  OwnedMLI->getBase().analyze(MDT->getBase());
1064  MLI = OwnedMLI.get();
1065  }
1066  }
1067 
1068  // Print out code for the function.
1069  bool HasAnyRealCode = false;
1070  int NumInstsInFunction = 0;
1071  for (auto &MBB : *MF) {
1072  // Print a label for the basic block.
1073  EmitBasicBlockStart(MBB);
1074  for (auto &MI : MBB) {
1075  // Print the assembly for the instruction.
1076  if (!MI.isPosition() && !MI.isImplicitDef() && !MI.isKill() &&
1077  !MI.isDebugInstr()) {
1078  HasAnyRealCode = true;
1079  ++NumInstsInFunction;
1080  }
1081 
1082  // If there is a pre-instruction symbol, emit a label for it here.
1083  if (MCSymbol *S = MI.getPreInstrSymbol())
1084  OutStreamer->EmitLabel(S);
1085 
1086  if (ShouldPrintDebugScopes) {
1087  for (const HandlerInfo &HI : Handlers) {
1088  NamedRegionTimer T(HI.TimerName, HI.TimerDescription,
1089  HI.TimerGroupName, HI.TimerGroupDescription,
1091  HI.Handler->beginInstruction(&MI);
1092  }
1093  }
1094 
1095  if (isVerbose() && emitComments(MI, OutStreamer->GetCommentOS(), this)) {
1096  MachineInstr *MIP = const_cast<MachineInstr *>(&MI);
1098  }
1099 
1100  switch (MI.getOpcode()) {
1101  case TargetOpcode::CFI_INSTRUCTION:
1103  break;
1104  case TargetOpcode::LOCAL_ESCAPE:
1105  emitFrameAlloc(MI);
1106  break;
1108  case TargetOpcode::GC_LABEL:
1109  OutStreamer->EmitLabel(MI.getOperand(0).getMCSymbol());
1110  break;
1112  EmitInlineAsm(&MI);
1113  break;
1114  case TargetOpcode::DBG_VALUE:
1115  if (isVerbose()) {
1116  if (!emitDebugValueComment(&MI, *this))
1117  EmitInstruction(&MI);
1118  }
1119  break;
1120  case TargetOpcode::DBG_LABEL:
1121  if (isVerbose()) {
1122  if (!emitDebugLabelComment(&MI, *this))
1123  EmitInstruction(&MI);
1124  }
1125  break;
1126  case TargetOpcode::IMPLICIT_DEF:
1127  if (isVerbose()) emitImplicitDef(&MI);
1128  break;
1129  case TargetOpcode::KILL:
1130  if (isVerbose()) emitKill(&MI, *this);
1131  break;
1132  default:
1133  EmitInstruction(&MI);
1134  break;
1135  }
1136 
1137  // If there is a post-instruction symbol, emit a label for it here.
1138  if (MCSymbol *S = MI.getPostInstrSymbol())
1139  OutStreamer->EmitLabel(S);
1140 
1141  if (ShouldPrintDebugScopes) {
1142  for (const HandlerInfo &HI : Handlers) {
1143  NamedRegionTimer T(HI.TimerName, HI.TimerDescription,
1144  HI.TimerGroupName, HI.TimerGroupDescription,
1146  HI.Handler->endInstruction();
1147  }
1148  }
1149  }
1150 
1151  EmitBasicBlockEnd(MBB);
1152  }
1153 
1154  EmittedInsts += NumInstsInFunction;
1155  MachineOptimizationRemarkAnalysis R(DEBUG_TYPE, "InstructionCount",
1156  MF->getFunction().getSubprogram(),
1157  &MF->front());
1158  R << ore::NV("NumInstructions", NumInstsInFunction)
1159  << " instructions in function";
1160  ORE->emit(R);
1161 
1162  // If the function is empty and the object file uses .subsections_via_symbols,
1163  // then we need to emit *something* to the function body to prevent the
1164  // labels from collapsing together. Just emit a noop.
1165  // Similarly, don't emit empty functions on Windows either. It can lead to
1166  // duplicate entries (two functions with the same RVA) in the Guard CF Table
1167  // after linking, causing the kernel not to load the binary:
1168  // https://developercommunity.visualstudio.com/content/problem/45366/vc-linker-creates-invalid-dll-with-clang-cl.html
1169  // FIXME: Hide this behind some API in e.g. MCAsmInfo or MCTargetStreamer.
1170  const Triple &TT = TM.getTargetTriple();
1171  if (!HasAnyRealCode && (MAI->hasSubsectionsViaSymbols() ||
1172  (TT.isOSWindows() && TT.isOSBinFormatCOFF()))) {
1173  MCInst Noop;
1174  MF->getSubtarget().getInstrInfo()->getNoop(Noop);
1175 
1176  // Targets can opt-out of emitting the noop here by leaving the opcode
1177  // unspecified.
1178  if (Noop.getOpcode()) {
1179  OutStreamer->AddComment("avoids zero-length function");
1180  OutStreamer->EmitInstruction(Noop, getSubtargetInfo());
1181  }
1182  }
1183 
1184  const Function &F = MF->getFunction();
1185  for (const auto &BB : F) {
1186  if (!BB.hasAddressTaken())
1187  continue;
1188  MCSymbol *Sym = GetBlockAddressSymbol(&BB);
1189  if (Sym->isDefined())
1190  continue;
1191  OutStreamer->AddComment("Address of block that was removed by CodeGen");
1192  OutStreamer->EmitLabel(Sym);
1193  }
1194 
1195  // Emit target-specific gunk after the function body.
1197 
1198  if (needFuncLabelsForEHOrDebugInfo(*MF, MMI) ||
1200  // Create a symbol for the end of function.
1201  CurrentFnEnd = createTempSymbol("func_end");
1202  OutStreamer->EmitLabel(CurrentFnEnd);
1203  }
1204 
1205  // If the target wants a .size directive for the size of the function, emit
1206  // it.
1208  // We can get the size as difference between the function label and the
1209  // temp label.
1210  const MCExpr *SizeExp = MCBinaryExpr::createSub(
1211  MCSymbolRefExpr::create(CurrentFnEnd, OutContext),
1213  OutStreamer->emitELFSize(CurrentFnSym, SizeExp);
1214  }
1215 
1216  for (const HandlerInfo &HI : Handlers) {
1217  NamedRegionTimer T(HI.TimerName, HI.TimerDescription, HI.TimerGroupName,
1218  HI.TimerGroupDescription, TimePassesIsEnabled);
1219  HI.Handler->markFunctionEnd();
1220  }
1221 
1222  // Print out jump tables referenced by the function.
1224 
1225  // Emit post-function debug and/or EH information.
1226  for (const HandlerInfo &HI : Handlers) {
1227  NamedRegionTimer T(HI.TimerName, HI.TimerDescription, HI.TimerGroupName,
1228  HI.TimerGroupDescription, TimePassesIsEnabled);
1229  HI.Handler->endFunction(MF);
1230  }
1231 
1232  // Emit section containing stack size metadata.
1233  emitStackSizeSection(*MF);
1234 
1235  if (isVerbose())
1236  OutStreamer->GetCommentOS() << "-- End function\n";
1237 
1238  OutStreamer->AddBlankLine();
1239 }
1240 
1241 /// Compute the number of Global Variables that uses a Constant.
1242 static unsigned getNumGlobalVariableUses(const Constant *C) {
1243  if (!C)
1244  return 0;
1245 
1246  if (isa<GlobalVariable>(C))
1247  return 1;
1248 
1249  unsigned NumUses = 0;
1250  for (auto *CU : C->users())
1251  NumUses += getNumGlobalVariableUses(dyn_cast<Constant>(CU));
1252 
1253  return NumUses;
1254 }
1255 
1256 /// Only consider global GOT equivalents if at least one user is a
1257 /// cstexpr inside an initializer of another global variables. Also, don't
1258 /// handle cstexpr inside instructions. During global variable emission,
1259 /// candidates are skipped and are emitted later in case at least one cstexpr
1260 /// isn't replaced by a PC relative GOT entry access.
1262  unsigned &NumGOTEquivUsers) {
1263  // Global GOT equivalents are unnamed private globals with a constant
1264  // pointer initializer to another global symbol. They must point to a
1265  // GlobalVariable or Function, i.e., as GlobalValue.
1266  if (!GV->hasGlobalUnnamedAddr() || !GV->hasInitializer() ||
1267  !GV->isConstant() || !GV->isDiscardableIfUnused() ||
1268  !dyn_cast<GlobalValue>(GV->getOperand(0)))
1269  return false;
1270 
1271  // To be a got equivalent, at least one of its users need to be a constant
1272  // expression used by another global variable.
1273  for (auto *U : GV->users())
1274  NumGOTEquivUsers += getNumGlobalVariableUses(dyn_cast<Constant>(U));
1275 
1276  return NumGOTEquivUsers > 0;
1277 }
1278 
1279 /// Unnamed constant global variables solely contaning a pointer to
1280 /// another globals variable is equivalent to a GOT table entry; it contains the
1281 /// the address of another symbol. Optimize it and replace accesses to these
1282 /// "GOT equivalents" by using the GOT entry for the final global instead.
1283 /// Compute GOT equivalent candidates among all global variables to avoid
1284 /// emitting them if possible later on, after it use is replaced by a GOT entry
1285 /// access.
1287  if (!getObjFileLowering().supportIndirectSymViaGOTPCRel())
1288  return;
1289 
1290  for (const auto &G : M.globals()) {
1291  unsigned NumGOTEquivUsers = 0;
1292  if (!isGOTEquivalentCandidate(&G, NumGOTEquivUsers))
1293  continue;
1294 
1295  const MCSymbol *GOTEquivSym = getSymbol(&G);
1296  GlobalGOTEquivs[GOTEquivSym] = std::make_pair(&G, NumGOTEquivUsers);
1297  }
1298 }
1299 
1300 /// Constant expressions using GOT equivalent globals may not be eligible
1301 /// for PC relative GOT entry conversion, in such cases we need to emit such
1302 /// globals we previously omitted in EmitGlobalVariable.
1304  if (!getObjFileLowering().supportIndirectSymViaGOTPCRel())
1305  return;
1306 
1307  SmallVector<const GlobalVariable *, 8> FailedCandidates;
1308  for (auto &I : GlobalGOTEquivs) {
1309  const GlobalVariable *GV = I.second.first;
1310  unsigned Cnt = I.second.second;
1311  if (Cnt)
1312  FailedCandidates.push_back(GV);
1313  }
1314  GlobalGOTEquivs.clear();
1315 
1316  for (auto *GV : FailedCandidates)
1317  EmitGlobalVariable(GV);
1318 }
1319 
1320 void AsmPrinter::emitGlobalIndirectSymbol(Module &M,
1321  const GlobalIndirectSymbol& GIS) {
1322  MCSymbol *Name = getSymbol(&GIS);
1323 
1324  if (GIS.hasExternalLinkage() || !MAI->getWeakRefDirective())
1325  OutStreamer->EmitSymbolAttribute(Name, MCSA_Global);
1326  else if (GIS.hasWeakLinkage() || GIS.hasLinkOnceLinkage())
1327  OutStreamer->EmitSymbolAttribute(Name, MCSA_WeakReference);
1328  else
1329  assert(GIS.hasLocalLinkage() && "Invalid alias or ifunc linkage");
1330 
1331  // Set the symbol type to function if the alias has a function type.
1332  // This affects codegen when the aliasee is not a function.
1333  if (GIS.getType()->getPointerElementType()->isFunctionTy()) {
1334  OutStreamer->EmitSymbolAttribute(Name, MCSA_ELF_TypeFunction);
1335  if (isa<GlobalIFunc>(GIS))
1336  OutStreamer->EmitSymbolAttribute(Name, MCSA_ELF_TypeIndFunction);
1337  }
1338 
1339  EmitVisibility(Name, GIS.getVisibility());
1340 
1341  const MCExpr *Expr = lowerConstant(GIS.getIndirectSymbol());
1342 
1343  if (isa<GlobalAlias>(&GIS) && MAI->hasAltEntry() && isa<MCBinaryExpr>(Expr))
1344  OutStreamer->EmitSymbolAttribute(Name, MCSA_AltEntry);
1345 
1346  // Emit the directives as assignments aka .set:
1347  OutStreamer->EmitAssignment(Name, Expr);
1348 
1349  if (auto *GA = dyn_cast<GlobalAlias>(&GIS)) {
1350  // If the aliasee does not correspond to a symbol in the output, i.e. the
1351  // alias is not of an object or the aliased object is private, then set the
1352  // size of the alias symbol from the type of the alias. We don't do this in
1353  // other situations as the alias and aliasee having differing types but same
1354  // size may be intentional.
1355  const GlobalObject *BaseObject = GA->getBaseObject();
1356  if (MAI->hasDotTypeDotSizeDirective() && GA->getValueType()->isSized() &&
1357  (!BaseObject || BaseObject->hasPrivateLinkage())) {
1358  const DataLayout &DL = M.getDataLayout();
1359  uint64_t Size = DL.getTypeAllocSize(GA->getValueType());
1360  OutStreamer->emitELFSize(Name, MCConstantExpr::create(Size, OutContext));
1361  }
1362  }
1363 }
1364 
1366  // Set the MachineFunction to nullptr so that we can catch attempted
1367  // accesses to MF specific features at the module level and so that
1368  // we can conditionalize accesses based on whether or not it is nullptr.
1369  MF = nullptr;
1370 
1371  // Gather all GOT equivalent globals in the module. We really need two
1372  // passes over the globals: one to compute and another to avoid its emission
1373  // in EmitGlobalVariable, otherwise we would not be able to handle cases
1374  // where the got equivalent shows up before its use.
1376 
1377  // Emit global variables.
1378  for (const auto &G : M.globals())
1380 
1381  // Emit remaining GOT equivalent globals.
1383 
1384  // Emit visibility info for declarations
1385  for (const Function &F : M) {
1386  if (!F.isDeclarationForLinker())
1387  continue;
1388  GlobalValue::VisibilityTypes V = F.getVisibility();
1390  continue;
1391 
1392  MCSymbol *Name = getSymbol(&F);
1393  EmitVisibility(Name, V, false);
1394  }
1395 
1397 
1398  TLOF.emitModuleMetadata(*OutStreamer, M);
1399 
1402 
1403  // Output stubs for external and common global variables.
1405  if (!Stubs.empty()) {
1406  OutStreamer->SwitchSection(TLOF.getDataSection());
1407  const DataLayout &DL = M.getDataLayout();
1408 
1410  for (const auto &Stub : Stubs) {
1411  OutStreamer->EmitLabel(Stub.first);
1412  OutStreamer->EmitSymbolValue(Stub.second.getPointer(),
1413  DL.getPointerSize());
1414  }
1415  }
1416  }
1417 
1419  MachineModuleInfoCOFF &MMICOFF =
1421 
1422  // Output stubs for external and common global variables.
1424  if (!Stubs.empty()) {
1425  const DataLayout &DL = M.getDataLayout();
1426 
1427  for (const auto &Stub : Stubs) {
1428  SmallString<256> SectionName = StringRef(".rdata$");
1429  SectionName += Stub.first->getName();
1430  OutStreamer->SwitchSection(OutContext.getCOFFSection(
1431  SectionName,
1434  SectionKind::getReadOnly(), Stub.first->getName(),
1437  OutStreamer->EmitSymbolAttribute(Stub.first, MCSA_Global);
1438  OutStreamer->EmitLabel(Stub.first);
1439  OutStreamer->EmitSymbolValue(Stub.second.getPointer(),
1440  DL.getPointerSize());
1441  }
1442  }
1443  }
1444 
1445  // Finalize debug and EH information.
1446  for (const HandlerInfo &HI : Handlers) {
1447  NamedRegionTimer T(HI.TimerName, HI.TimerDescription, HI.TimerGroupName,
1448  HI.TimerGroupDescription, TimePassesIsEnabled);
1449  HI.Handler->endModule();
1450  delete HI.Handler;
1451  }
1452  Handlers.clear();
1453  DD = nullptr;
1454 
1455  // If the target wants to know about weak references, print them all.
1456  if (MAI->getWeakRefDirective()) {
1457  // FIXME: This is not lazy, it would be nice to only print weak references
1458  // to stuff that is actually used. Note that doing so would require targets
1459  // to notice uses in operands (due to constant exprs etc). This should
1460  // happen with the MC stuff eventually.
1461 
1462  // Print out module-level global objects here.
1463  for (const auto &GO : M.global_objects()) {
1464  if (!GO.hasExternalWeakLinkage())
1465  continue;
1466  OutStreamer->EmitSymbolAttribute(getSymbol(&GO), MCSA_WeakReference);
1467  }
1468  }
1469 
1470  OutStreamer->AddBlankLine();
1471 
1472  // Print aliases in topological order, that is, for each alias a = b,
1473  // b must be printed before a.
1474  // This is because on some targets (e.g. PowerPC) linker expects aliases in
1475  // such an order to generate correct TOC information.
1478  for (const auto &Alias : M.aliases()) {
1479  for (const GlobalAlias *Cur = &Alias; Cur;
1480  Cur = dyn_cast<GlobalAlias>(Cur->getAliasee())) {
1481  if (!AliasVisited.insert(Cur).second)
1482  break;
1483  AliasStack.push_back(Cur);
1484  }
1485  for (const GlobalAlias *AncestorAlias : llvm::reverse(AliasStack))
1486  emitGlobalIndirectSymbol(M, *AncestorAlias);
1487  AliasStack.clear();
1488  }
1489  for (const auto &IFunc : M.ifuncs())
1490  emitGlobalIndirectSymbol(M, IFunc);
1491 
1492  GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
1493  assert(MI && "AsmPrinter didn't require GCModuleInfo?");
1494  for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; )
1495  if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(**--I))
1496  MP->finishAssembly(M, *MI, *this);
1497 
1498  // Emit llvm.ident metadata in an '.ident' directive.
1499  EmitModuleIdents(M);
1500 
1501  // Emit __morestack address if needed for indirect calls.
1502  if (MMI->usesMorestackAddr()) {
1503  unsigned Align = 1;
1504  MCSection *ReadOnlySection = getObjFileLowering().getSectionForConstant(
1506  /*C=*/nullptr, Align);
1507  OutStreamer->SwitchSection(ReadOnlySection);
1508 
1509  MCSymbol *AddrSymbol =
1510  OutContext.getOrCreateSymbol(StringRef("__morestack_addr"));
1511  OutStreamer->EmitLabel(AddrSymbol);
1512 
1513  unsigned PtrSize = MAI->getCodePointerSize();
1514  OutStreamer->EmitSymbolValue(GetExternalSymbolSymbol("__morestack"),
1515  PtrSize);
1516  }
1517 
1518  // Emit .note.GNU-split-stack and .note.GNU-no-split-stack sections if
1519  // split-stack is used.
1521  OutStreamer->SwitchSection(
1522  OutContext.getELFSection(".note.GNU-split-stack", ELF::SHT_PROGBITS, 0));
1523  if (MMI->hasNosplitStack())
1524  OutStreamer->SwitchSection(
1525  OutContext.getELFSection(".note.GNU-no-split-stack", ELF::SHT_PROGBITS, 0));
1526  }
1527 
1528  // If we don't have any trampolines, then we don't require stack memory
1529  // to be executable. Some targets have a directive to declare this.
1530  Function *InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline");
1531  if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty())
1533  OutStreamer->SwitchSection(S);
1534 
1536  // Emit /EXPORT: flags for each exported global as necessary.
1537  const auto &TLOF = getObjFileLowering();
1538  std::string Flags;
1539 
1540  for (const GlobalValue &GV : M.global_values()) {
1541  raw_string_ostream OS(Flags);
1542  TLOF.emitLinkerFlagsForGlobal(OS, &GV);
1543  OS.flush();
1544  if (!Flags.empty()) {
1545  OutStreamer->SwitchSection(TLOF.getDrectveSection());
1546  OutStreamer->EmitBytes(Flags);
1547  }
1548  Flags.clear();
1549  }
1550 
1551  // Emit /INCLUDE: flags for each used global as necessary.
1552  if (const auto *LU = M.getNamedGlobal("llvm.used")) {
1553  assert(LU->hasInitializer() &&
1554  "expected llvm.used to have an initializer");
1555  assert(isa<ArrayType>(LU->getValueType()) &&
1556  "expected llvm.used to be an array type");
1557  if (const auto *A = cast<ConstantArray>(LU->getInitializer())) {
1558  for (const Value *Op : A->operands()) {
1559  const auto *GV =
1560  cast<GlobalValue>(Op->stripPointerCastsNoFollowAliases());
1561  // Global symbols with internal or private linkage are not visible to
1562  // the linker, and thus would cause an error when the linker tried to
1563  // preserve the symbol due to the `/include:` directive.
1564  if (GV->hasLocalLinkage())
1565  continue;
1566 
1567  raw_string_ostream OS(Flags);
1568  TLOF.emitLinkerFlagsForUsed(OS, GV);
1569  OS.flush();
1570 
1571  if (!Flags.empty()) {
1572  OutStreamer->SwitchSection(TLOF.getDrectveSection());
1573  OutStreamer->EmitBytes(Flags);
1574  }
1575  Flags.clear();
1576  }
1577  }
1578  }
1579  }
1580 
1581  if (TM.Options.EmitAddrsig) {
1582  // Emit address-significance attributes for all globals.
1583  OutStreamer->EmitAddrsig();
1584  for (const GlobalValue &GV : M.global_values())
1585  if (!GV.use_empty() && !GV.isThreadLocal() &&
1586  !GV.hasDLLImportStorageClass() && !GV.getName().startswith("llvm.") &&
1588  OutStreamer->EmitAddrsigSym(getSymbol(&GV));
1589  }
1590 
1591  // Allow the target to emit any magic that it wants at the end of the file,
1592  // after everything else has gone out.
1593  EmitEndOfAsmFile(M);
1594 
1595  MMI = nullptr;
1596 
1597  OutStreamer->Finish();
1598  OutStreamer->reset();
1599  OwnedMLI.reset();
1600  OwnedMDT.reset();
1601 
1602  return false;
1603 }
1604 
1606  if (!CurExceptionSym)
1607  CurExceptionSym = createTempSymbol("exception");
1608  return CurExceptionSym;
1609 }
1610 
1612  this->MF = &MF;
1613  // Get the function symbol.
1616  CurrentFnBegin = nullptr;
1617  CurExceptionSym = nullptr;
1618  bool NeedsLocalForSize = MAI->needsLocalForSize();
1619  if (needFuncLabelsForEHOrDebugInfo(MF, MMI) || NeedsLocalForSize ||
1621  CurrentFnBegin = createTempSymbol("func_begin");
1622  if (NeedsLocalForSize)
1623  CurrentFnSymForSize = CurrentFnBegin;
1624  }
1625 
1626  ORE = &getAnalysis<MachineOptimizationRemarkEmitterPass>().getORE();
1627 
1628  const TargetSubtargetInfo &STI = MF.getSubtarget();
1629  EnablePrintSchedInfo = PrintSchedule.getNumOccurrences()
1630  ? PrintSchedule
1631  : STI.supportPrintSchedInfo();
1632 }
1633 
1634 namespace {
1635 
1636 // Keep track the alignment, constpool entries per Section.
1637  struct SectionCPs {
1638  MCSection *S;
1639  unsigned Alignment;
1641 
1642  SectionCPs(MCSection *s, unsigned a) : S(s), Alignment(a) {}
1643  };
1644 
1645 } // end anonymous namespace
1646 
1647 /// EmitConstantPool - Print to the current output stream assembly
1648 /// representations of the constants in the constant pool MCP. This is
1649 /// used to print out constants which have been "spilled to memory" by
1650 /// the code generator.
1652  const MachineConstantPool *MCP = MF->getConstantPool();
1653  const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
1654  if (CP.empty()) return;
1655 
1656  // Calculate sections for constant pool entries. We collect entries to go into
1657  // the same section together to reduce amount of section switch statements.
1658  SmallVector<SectionCPs, 4> CPSections;
1659  for (unsigned i = 0, e = CP.size(); i != e; ++i) {
1660  const MachineConstantPoolEntry &CPE = CP[i];
1661  unsigned Align = CPE.getAlignment();
1662 
1663  SectionKind Kind = CPE.getSectionKind(&getDataLayout());
1664 
1665  const Constant *C = nullptr;
1666  if (!CPE.isMachineConstantPoolEntry())
1667  C = CPE.Val.ConstVal;
1668 
1670  Kind, C, Align);
1671 
1672  // The number of sections are small, just do a linear search from the
1673  // last section to the first.
1674  bool Found = false;
1675  unsigned SecIdx = CPSections.size();
1676  while (SecIdx != 0) {
1677  if (CPSections[--SecIdx].S == S) {
1678  Found = true;
1679  break;
1680  }
1681  }
1682  if (!Found) {
1683  SecIdx = CPSections.size();
1684  CPSections.push_back(SectionCPs(S, Align));
1685  }
1686 
1687  if (Align > CPSections[SecIdx].Alignment)
1688  CPSections[SecIdx].Alignment = Align;
1689  CPSections[SecIdx].CPEs.push_back(i);
1690  }
1691 
1692  // Now print stuff into the calculated sections.
1693  const MCSection *CurSection = nullptr;
1694  unsigned Offset = 0;
1695  for (unsigned i = 0, e = CPSections.size(); i != e; ++i) {
1696  for (unsigned j = 0, ee = CPSections[i].CPEs.size(); j != ee; ++j) {
1697  unsigned CPI = CPSections[i].CPEs[j];
1698  MCSymbol *Sym = GetCPISymbol(CPI);
1699  if (!Sym->isUndefined())
1700  continue;
1701 
1702  if (CurSection != CPSections[i].S) {
1703  OutStreamer->SwitchSection(CPSections[i].S);
1704  EmitAlignment(Log2_32(CPSections[i].Alignment));
1705  CurSection = CPSections[i].S;
1706  Offset = 0;
1707  }
1708 
1709  MachineConstantPoolEntry CPE = CP[CPI];
1710 
1711  // Emit inter-object padding for alignment.
1712  unsigned AlignMask = CPE.getAlignment() - 1;
1713  unsigned NewOffset = (Offset + AlignMask) & ~AlignMask;
1714  OutStreamer->EmitZeros(NewOffset - Offset);
1715 
1716  Type *Ty = CPE.getType();
1717  Offset = NewOffset + getDataLayout().getTypeAllocSize(Ty);
1718 
1719  OutStreamer->EmitLabel(Sym);
1720  if (CPE.isMachineConstantPoolEntry())
1722  else
1724  }
1725  }
1726 }
1727 
1728 /// EmitJumpTableInfo - Print assembly representations of the jump tables used
1729 /// by the current function to the current output stream.
1731  const DataLayout &DL = MF->getDataLayout();
1732  const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo();
1733  if (!MJTI) return;
1734  if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_Inline) return;
1735  const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
1736  if (JT.empty()) return;
1737 
1738  // Pick the directive to use to print the jump table entries, and switch to
1739  // the appropriate section.
1740  const Function &F = MF->getFunction();
1742  bool JTInDiffSection = !TLOF.shouldPutJumpTableInFunctionSection(
1744  F);
1745  if (JTInDiffSection) {
1746  // Drop it in the readonly section.
1747  MCSection *ReadOnlySection = TLOF.getSectionForJumpTable(F, TM);
1748  OutStreamer->SwitchSection(ReadOnlySection);
1749  }
1750 
1752 
1753  // Jump tables in code sections are marked with a data_region directive
1754  // where that's supported.
1755  if (!JTInDiffSection)
1756  OutStreamer->EmitDataRegion(MCDR_DataRegionJT32);
1757 
1758  for (unsigned JTI = 0, e = JT.size(); JTI != e; ++JTI) {
1759  const std::vector<MachineBasicBlock*> &JTBBs = JT[JTI].MBBs;
1760 
1761  // If this jump table was deleted, ignore it.
1762  if (JTBBs.empty()) continue;
1763 
1764  // For the EK_LabelDifference32 entry, if using .set avoids a relocation,
1765  /// emit a .set directive for each unique entry.
1769  const TargetLowering *TLI = MF->getSubtarget().getTargetLowering();
1771  for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
1772  const MachineBasicBlock *MBB = JTBBs[ii];
1773  if (!EmittedSets.insert(MBB).second)
1774  continue;
1775 
1776  // .set LJTSet, LBB32-base
1777  const MCExpr *LHS =
1779  OutStreamer->EmitAssignment(GetJTSetSymbol(JTI, MBB->getNumber()),
1780  MCBinaryExpr::createSub(LHS, Base,
1781  OutContext));
1782  }
1783  }
1784 
1785  // On some targets (e.g. Darwin) we want to emit two consecutive labels
1786  // before each jump table. The first label is never referenced, but tells
1787  // the assembler and linker the extents of the jump table object. The
1788  // second label is actually referenced by the code.
1789  if (JTInDiffSection && DL.hasLinkerPrivateGlobalPrefix())
1790  // FIXME: This doesn't have to have any specific name, just any randomly
1791  // named and numbered 'l' label would work. Simplify GetJTISymbol.
1792  OutStreamer->EmitLabel(GetJTISymbol(JTI, true));
1793 
1794  OutStreamer->EmitLabel(GetJTISymbol(JTI));
1795 
1796  for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
1797  EmitJumpTableEntry(MJTI, JTBBs[ii], JTI);
1798  }
1799  if (!JTInDiffSection)
1800  OutStreamer->EmitDataRegion(MCDR_DataRegionEnd);
1801 }
1802 
1803 /// EmitJumpTableEntry - Emit a jump table entry for the specified MBB to the
1804 /// current stream.
1805 void AsmPrinter::EmitJumpTableEntry(const MachineJumpTableInfo *MJTI,
1806  const MachineBasicBlock *MBB,
1807  unsigned UID) const {
1808  assert(MBB && MBB->getNumber() >= 0 && "Invalid basic block");
1809  const MCExpr *Value = nullptr;
1810  switch (MJTI->getEntryKind()) {
1812  llvm_unreachable("Cannot emit EK_Inline jump table entry");
1815  MJTI, MBB, UID, OutContext);
1816  break;
1818  // EK_BlockAddress - Each entry is a plain address of block, e.g.:
1819  // .word LBB123
1820  Value = MCSymbolRefExpr::create(MBB->getSymbol(), OutContext);
1821  break;
1823  // EK_GPRel32BlockAddress - Each entry is an address of block, encoded
1824  // with a relocation as gp-relative, e.g.:
1825  // .gprel32 LBB123
1826  MCSymbol *MBBSym = MBB->getSymbol();
1827  OutStreamer->EmitGPRel32Value(MCSymbolRefExpr::create(MBBSym, OutContext));
1828  return;
1829  }
1830 
1832  // EK_GPRel64BlockAddress - Each entry is an address of block, encoded
1833  // with a relocation as gp-relative, e.g.:
1834  // .gpdword LBB123
1835  MCSymbol *MBBSym = MBB->getSymbol();
1836  OutStreamer->EmitGPRel64Value(MCSymbolRefExpr::create(MBBSym, OutContext));
1837  return;
1838  }
1839 
1841  // Each entry is the address of the block minus the address of the jump
1842  // table. This is used for PIC jump tables where gprel32 is not supported.
1843  // e.g.:
1844  // .word LBB123 - LJTI1_2
1845  // If the .set directive avoids relocations, this is emitted as:
1846  // .set L4_5_set_123, LBB123 - LJTI1_2
1847  // .word L4_5_set_123
1849  Value = MCSymbolRefExpr::create(GetJTSetSymbol(UID, MBB->getNumber()),
1850  OutContext);
1851  break;
1852  }
1853  Value = MCSymbolRefExpr::create(MBB->getSymbol(), OutContext);
1854  const TargetLowering *TLI = MF->getSubtarget().getTargetLowering();
1855  const MCExpr *Base = TLI->getPICJumpTableRelocBaseExpr(MF, UID, OutContext);
1856  Value = MCBinaryExpr::createSub(Value, Base, OutContext);
1857  break;
1858  }
1859  }
1860 
1861  assert(Value && "Unknown entry kind!");
1862 
1863  unsigned EntrySize = MJTI->getEntrySize(getDataLayout());
1864  OutStreamer->EmitValue(Value, EntrySize);
1865 }
1866 
1867 /// EmitSpecialLLVMGlobal - Check to see if the specified global is a
1868 /// special global used by LLVM. If so, emit it and return true, otherwise
1869 /// do nothing and return false.
1871  if (GV->getName() == "llvm.used") {
1872  if (MAI->hasNoDeadStrip()) // No need to emit this at all.
1873  EmitLLVMUsedList(cast<ConstantArray>(GV->getInitializer()));
1874  return true;
1875  }
1876 
1877  // Ignore debug and non-emitted data. This handles llvm.compiler.used.
1878  if (GV->getSection() == "llvm.metadata" ||
1880  return true;
1881 
1882  if (!GV->hasAppendingLinkage()) return false;
1883 
1884  assert(GV->hasInitializer() && "Not a special LLVM global!");
1885 
1886  if (GV->getName() == "llvm.global_ctors") {
1887  EmitXXStructorList(GV->getParent()->getDataLayout(), GV->getInitializer(),
1888  /* isCtor */ true);
1889 
1890  return true;
1891  }
1892 
1893  if (GV->getName() == "llvm.global_dtors") {
1894  EmitXXStructorList(GV->getParent()->getDataLayout(), GV->getInitializer(),
1895  /* isCtor */ false);
1896 
1897  return true;
1898  }
1899 
1900  report_fatal_error("unknown special variable");
1901 }
1902 
1903 /// EmitLLVMUsedList - For targets that define a MAI::UsedDirective, mark each
1904 /// global in the specified llvm.used list for which emitUsedDirectiveFor
1905 /// is true, as being used with this directive.
1906 void AsmPrinter::EmitLLVMUsedList(const ConstantArray *InitList) {
1907  // Should be an array of 'i8*'.
1908  for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
1909  const GlobalValue *GV =
1911  if (GV)
1912  OutStreamer->EmitSymbolAttribute(getSymbol(GV), MCSA_NoDeadStrip);
1913  }
1914 }
1915 
1916 namespace {
1917 
1918 struct Structor {
1919  int Priority = 0;
1920  Constant *Func = nullptr;
1921  GlobalValue *ComdatKey = nullptr;
1922 
1923  Structor() = default;
1924 };
1925 
1926 } // end anonymous namespace
1927 
1928 /// EmitXXStructorList - Emit the ctor or dtor list taking into account the init
1929 /// priority.
1930 void AsmPrinter::EmitXXStructorList(const DataLayout &DL, const Constant *List,
1931  bool isCtor) {
1932  // Should be an array of '{ int, void ()* }' structs. The first value is the
1933  // init priority.
1934  if (!isa<ConstantArray>(List)) return;
1935 
1936  // Sanity check the structors list.
1937  const ConstantArray *InitList = dyn_cast<ConstantArray>(List);
1938  if (!InitList) return; // Not an array!
1939  StructType *ETy = dyn_cast<StructType>(InitList->getType()->getElementType());
1940  // FIXME: Only allow the 3-field form in LLVM 4.0.
1941  if (!ETy || ETy->getNumElements() < 2 || ETy->getNumElements() > 3)
1942  return; // Not an array of two or three elements!
1943  if (!isa<IntegerType>(ETy->getTypeAtIndex(0U)) ||
1944  !isa<PointerType>(ETy->getTypeAtIndex(1U))) return; // Not (int, ptr).
1945  if (ETy->getNumElements() == 3 && !isa<PointerType>(ETy->getTypeAtIndex(2U)))
1946  return; // Not (int, ptr, ptr).
1947 
1948  // Gather the structors in a form that's convenient for sorting by priority.
1949  SmallVector<Structor, 8> Structors;
1950  for (Value *O : InitList->operands()) {
1952  if (!CS) continue; // Malformed.
1953  if (CS->getOperand(1)->isNullValue())
1954  break; // Found a null terminator, skip the rest.
1955  ConstantInt *Priority = dyn_cast<ConstantInt>(CS->getOperand(0));
1956  if (!Priority) continue; // Malformed.
1957  Structors.push_back(Structor());
1958  Structor &S = Structors.back();
1959  S.Priority = Priority->getLimitedValue(65535);
1960  S.Func = CS->getOperand(1);
1961  if (ETy->getNumElements() == 3 && !CS->getOperand(2)->isNullValue())
1962  S.ComdatKey =
1963  dyn_cast<GlobalValue>(CS->getOperand(2)->stripPointerCasts());
1964  }
1965 
1966  // Emit the function pointers in the target-specific order
1967  unsigned Align = Log2_32(DL.getPointerPrefAlignment());
1968  std::stable_sort(Structors.begin(), Structors.end(),
1969  [](const Structor &L,
1970  const Structor &R) { return L.Priority < R.Priority; });
1971  for (Structor &S : Structors) {
1973  const MCSymbol *KeySym = nullptr;
1974  if (GlobalValue *GV = S.ComdatKey) {
1975  if (GV->isDeclarationForLinker())
1976  // If the associated variable is not defined in this module
1977  // (it might be available_externally, or have been an
1978  // available_externally definition that was dropped by the
1979  // EliminateAvailableExternally pass), some other TU
1980  // will provide its dynamic initializer.
1981  continue;
1982 
1983  KeySym = getSymbol(GV);
1984  }
1985  MCSection *OutputSection =
1986  (isCtor ? Obj.getStaticCtorSection(S.Priority, KeySym)
1987  : Obj.getStaticDtorSection(S.Priority, KeySym));
1988  OutStreamer->SwitchSection(OutputSection);
1989  if (OutStreamer->getCurrentSection() != OutStreamer->getPreviousSection())
1990  EmitAlignment(Align);
1991  EmitXXStructor(DL, S.Func);
1992  }
1993 }
1994 
1995 void AsmPrinter::EmitModuleIdents(Module &M) {
1996  if (!MAI->hasIdentDirective())
1997  return;
1998 
1999  if (const NamedMDNode *NMD = M.getNamedMetadata("llvm.ident")) {
2000  for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) {
2001  const MDNode *N = NMD->getOperand(i);
2002  assert(N->getNumOperands() == 1 &&
2003  "llvm.ident metadata entry can have only one operand");
2004  const MDString *S = cast<MDString>(N->getOperand(0));
2005  OutStreamer->EmitIdent(S->getString());
2006  }
2007  }
2008 }
2009 
2010 //===--------------------------------------------------------------------===//
2011 // Emission and print routines
2012 //
2013 
2014 /// Emit a byte directive and value.
2015 ///
2016 void AsmPrinter::emitInt8(int Value) const {
2017  OutStreamer->EmitIntValue(Value, 1);
2018 }
2019 
2020 /// Emit a short directive and value.
2021 void AsmPrinter::emitInt16(int Value) const {
2022  OutStreamer->EmitIntValue(Value, 2);
2023 }
2024 
2025 /// Emit a long directive and value.
2026 void AsmPrinter::emitInt32(int Value) const {
2027  OutStreamer->EmitIntValue(Value, 4);
2028 }
2029 
2030 /// Emit a long long directive and value.
2031 void AsmPrinter::emitInt64(uint64_t Value) const {
2032  OutStreamer->EmitIntValue(Value, 8);
2033 }
2034 
2035 /// Emit something like ".long Hi-Lo" where the size in bytes of the directive
2036 /// is specified by Size and Hi/Lo specify the labels. This implicitly uses
2037 /// .set if it avoids relocations.
2039  unsigned Size) const {
2040  OutStreamer->emitAbsoluteSymbolDiff(Hi, Lo, Size);
2041 }
2042 
2043 /// EmitLabelPlusOffset - Emit something like ".long Label+Offset"
2044 /// where the size in bytes of the directive is specified by Size and Label
2045 /// specifies the label. This implicitly uses .set if it is available.
2047  unsigned Size,
2048  bool IsSectionRelative) const {
2049  if (MAI->needsDwarfSectionOffsetDirective() && IsSectionRelative) {
2050  OutStreamer->EmitCOFFSecRel32(Label, Offset);
2051  if (Size > 4)
2052  OutStreamer->EmitZeros(Size - 4);
2053  return;
2054  }
2055 
2056  // Emit Label+Offset (or just Label if Offset is zero)
2057  const MCExpr *Expr = MCSymbolRefExpr::create(Label, OutContext);
2058  if (Offset)
2059  Expr = MCBinaryExpr::createAdd(
2060  Expr, MCConstantExpr::create(Offset, OutContext), OutContext);
2061 
2062  OutStreamer->EmitValue(Expr, Size);
2063 }
2064 
2065 //===----------------------------------------------------------------------===//
2066 
2067 // EmitAlignment - Emit an alignment directive to the specified power of
2068 // two boundary. For example, if you pass in 3 here, you will get an 8
2069 // byte alignment. If a global value is specified, and if that global has
2070 // an explicit alignment requested, it will override the alignment request
2071 // if required for correctness.
2072 void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalObject *GV) const {
2073  if (GV)
2074  NumBits = getGVAlignmentLog2(GV, GV->getParent()->getDataLayout(), NumBits);
2075 
2076  if (NumBits == 0) return; // 1-byte aligned: no need to emit alignment.
2077 
2078  assert(NumBits <
2079  static_cast<unsigned>(std::numeric_limits<unsigned>::digits) &&
2080  "undefined behavior");
2081  if (getCurrentSection()->getKind().isText())
2082  OutStreamer->EmitCodeAlignment(1u << NumBits);
2083  else
2084  OutStreamer->EmitValueToAlignment(1u << NumBits);
2085 }
2086 
2087 //===----------------------------------------------------------------------===//
2088 // Constant emission.
2089 //===----------------------------------------------------------------------===//
2090 
2092  MCContext &Ctx = OutContext;
2093 
2094  if (CV->isNullValue() || isa<UndefValue>(CV))
2095  return MCConstantExpr::create(0, Ctx);
2096 
2097  if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV))
2098  return MCConstantExpr::create(CI->getZExtValue(), Ctx);
2099 
2100  if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV))
2101  return MCSymbolRefExpr::create(getSymbol(GV), Ctx);
2102 
2103  if (const BlockAddress *BA = dyn_cast<BlockAddress>(CV))
2105 
2106  const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV);
2107  if (!CE) {
2108  llvm_unreachable("Unknown constant value to lower!");
2109  }
2110 
2111  switch (CE->getOpcode()) {
2112  default:
2113  // If the code isn't optimized, there may be outstanding folding
2114  // opportunities. Attempt to fold the expression using DataLayout as a
2115  // last resort before giving up.
2117  if (C != CE)
2118  return lowerConstant(C);
2119 
2120  // Otherwise report the problem to the user.
2121  {
2122  std::string S;
2123  raw_string_ostream OS(S);
2124  OS << "Unsupported expression in static initializer: ";
2125  CE->printAsOperand(OS, /*PrintType=*/false,
2126  !MF ? nullptr : MF->getFunction().getParent());
2127  report_fatal_error(OS.str());
2128  }
2129  case Instruction::GetElementPtr: {
2130  // Generate a symbolic expression for the byte address
2131  APInt OffsetAI(getDataLayout().getPointerTypeSizeInBits(CE->getType()), 0);
2132  cast<GEPOperator>(CE)->accumulateConstantOffset(getDataLayout(), OffsetAI);
2133 
2134  const MCExpr *Base = lowerConstant(CE->getOperand(0));
2135  if (!OffsetAI)
2136  return Base;
2137 
2138  int64_t Offset = OffsetAI.getSExtValue();
2139  return MCBinaryExpr::createAdd(Base, MCConstantExpr::create(Offset, Ctx),
2140  Ctx);
2141  }
2142 
2143  case Instruction::Trunc:
2144  // We emit the value and depend on the assembler to truncate the generated
2145  // expression properly. This is important for differences between
2146  // blockaddress labels. Since the two labels are in the same function, it
2147  // is reasonable to treat their delta as a 32-bit value.
2149  case Instruction::BitCast:
2150  return lowerConstant(CE->getOperand(0));
2151 
2152  case Instruction::IntToPtr: {
2153  const DataLayout &DL = getDataLayout();
2154 
2155  // Handle casts to pointers by changing them into casts to the appropriate
2156  // integer type. This promotes constant folding and simplifies this code.
2157  Constant *Op = CE->getOperand(0);
2159  false/*ZExt*/);
2160  return lowerConstant(Op);
2161  }
2162 
2163  case Instruction::PtrToInt: {
2164  const DataLayout &DL = getDataLayout();
2165 
2166  // Support only foldable casts to/from pointers that can be eliminated by
2167  // changing the pointer to the appropriately sized integer type.
2168  Constant *Op = CE->getOperand(0);
2169  Type *Ty = CE->getType();
2170 
2171  const MCExpr *OpExpr = lowerConstant(Op);
2172 
2173  // We can emit the pointer value into this slot if the slot is an
2174  // integer slot equal to the size of the pointer.
2175  if (DL.getTypeAllocSize(Ty) == DL.getTypeAllocSize(Op->getType()))
2176  return OpExpr;
2177 
2178  // Otherwise the pointer is smaller than the resultant integer, mask off
2179  // the high bits so we are sure to get a proper truncation if the input is
2180  // a constant expr.
2181  unsigned InBits = DL.getTypeAllocSizeInBits(Op->getType());
2182  const MCExpr *MaskExpr = MCConstantExpr::create(~0ULL >> (64-InBits), Ctx);
2183  return MCBinaryExpr::createAnd(OpExpr, MaskExpr, Ctx);
2184  }
2185 
2186  case Instruction::Sub: {
2187  GlobalValue *LHSGV;
2188  APInt LHSOffset;
2189  if (IsConstantOffsetFromGlobal(CE->getOperand(0), LHSGV, LHSOffset,
2190  getDataLayout())) {
2191  GlobalValue *RHSGV;
2192  APInt RHSOffset;
2193  if (IsConstantOffsetFromGlobal(CE->getOperand(1), RHSGV, RHSOffset,
2194  getDataLayout())) {
2195  const MCExpr *RelocExpr =
2196  getObjFileLowering().lowerRelativeReference(LHSGV, RHSGV, TM);
2197  if (!RelocExpr)
2198  RelocExpr = MCBinaryExpr::createSub(
2199  MCSymbolRefExpr::create(getSymbol(LHSGV), Ctx),
2200  MCSymbolRefExpr::create(getSymbol(RHSGV), Ctx), Ctx);
2201  int64_t Addend = (LHSOffset - RHSOffset).getSExtValue();
2202  if (Addend != 0)
2203  RelocExpr = MCBinaryExpr::createAdd(
2204  RelocExpr, MCConstantExpr::create(Addend, Ctx), Ctx);
2205  return RelocExpr;
2206  }
2207  }
2208  }
2209  // else fallthrough
2211 
2212  // The MC library also has a right-shift operator, but it isn't consistently
2213  // signed or unsigned between different targets.
2214  case Instruction::Add:
2215  case Instruction::Mul:
2216  case Instruction::SDiv:
2217  case Instruction::SRem:
2218  case Instruction::Shl:
2219  case Instruction::And:
2220  case Instruction::Or:
2221  case Instruction::Xor: {
2222  const MCExpr *LHS = lowerConstant(CE->getOperand(0));
2223  const MCExpr *RHS = lowerConstant(CE->getOperand(1));
2224  switch (CE->getOpcode()) {
2225  default: llvm_unreachable("Unknown binary operator constant cast expr");
2226  case Instruction::Add: return MCBinaryExpr::createAdd(LHS, RHS, Ctx);
2227  case Instruction::Sub: return MCBinaryExpr::createSub(LHS, RHS, Ctx);
2228  case Instruction::Mul: return MCBinaryExpr::createMul(LHS, RHS, Ctx);
2229  case Instruction::SDiv: return MCBinaryExpr::createDiv(LHS, RHS, Ctx);
2230  case Instruction::SRem: return MCBinaryExpr::createMod(LHS, RHS, Ctx);
2231  case Instruction::Shl: return MCBinaryExpr::createShl(LHS, RHS, Ctx);
2232  case Instruction::And: return MCBinaryExpr::createAnd(LHS, RHS, Ctx);
2233  case Instruction::Or: return MCBinaryExpr::createOr (LHS, RHS, Ctx);
2234  case Instruction::Xor: return MCBinaryExpr::createXor(LHS, RHS, Ctx);
2235  }
2236  }
2237  }
2238 }
2239 
2240 static void emitGlobalConstantImpl(const DataLayout &DL, const Constant *C,
2241  AsmPrinter &AP,
2242  const Constant *BaseCV = nullptr,
2243  uint64_t Offset = 0);
2244 
2245 static void emitGlobalConstantFP(const ConstantFP *CFP, AsmPrinter &AP);
2246 static void emitGlobalConstantFP(APFloat APF, Type *ET, AsmPrinter &AP);
2247 
2248 /// isRepeatedByteSequence - Determine whether the given value is
2249 /// composed of a repeated sequence of identical bytes and return the
2250 /// byte value. If it is not a repeated sequence, return -1.
2253  assert(!Data.empty() && "Empty aggregates should be CAZ node");
2254  char C = Data[0];
2255  for (unsigned i = 1, e = Data.size(); i != e; ++i)
2256  if (Data[i] != C) return -1;
2257  return static_cast<uint8_t>(C); // Ensure 255 is not returned as -1.
2258 }
2259 
2260 /// isRepeatedByteSequence - Determine whether the given value is
2261 /// composed of a repeated sequence of identical bytes and return the
2262 /// byte value. If it is not a repeated sequence, return -1.
2263 static int isRepeatedByteSequence(const Value *V, const DataLayout &DL) {
2264  if (const ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
2265  uint64_t Size = DL.getTypeAllocSizeInBits(V->getType());
2266  assert(Size % 8 == 0);
2267 
2268  // Extend the element to take zero padding into account.
2269  APInt Value = CI->getValue().zextOrSelf(Size);
2270  if (!Value.isSplat(8))
2271  return -1;
2272 
2273  return Value.zextOrTrunc(8).getZExtValue();
2274  }
2275  if (const ConstantArray *CA = dyn_cast<ConstantArray>(V)) {
2276  // Make sure all array elements are sequences of the same repeated
2277  // byte.
2278  assert(CA->getNumOperands() != 0 && "Should be a CAZ");
2279  Constant *Op0 = CA->getOperand(0);
2280  int Byte = isRepeatedByteSequence(Op0, DL);
2281  if (Byte == -1)
2282  return -1;
2283 
2284  // All array elements must be equal.
2285  for (unsigned i = 1, e = CA->getNumOperands(); i != e; ++i)
2286  if (CA->getOperand(i) != Op0)
2287  return -1;
2288  return Byte;
2289  }
2290 
2291  if (const ConstantDataSequential *CDS = dyn_cast<ConstantDataSequential>(V))
2292  return isRepeatedByteSequence(CDS);
2293 
2294  return -1;
2295 }
2296 
2298  const ConstantDataSequential *CDS,
2299  AsmPrinter &AP) {
2300  // See if we can aggregate this into a .fill, if so, emit it as such.
2301  int Value = isRepeatedByteSequence(CDS, DL);
2302  if (Value != -1) {
2303  uint64_t Bytes = DL.getTypeAllocSize(CDS->getType());
2304  // Don't emit a 1-byte object as a .fill.
2305  if (Bytes > 1)
2306  return AP.OutStreamer->emitFill(Bytes, Value);
2307  }
2308 
2309  // If this can be emitted with .ascii/.asciz, emit it as such.
2310  if (CDS->isString())
2311  return AP.OutStreamer->EmitBytes(CDS->getAsString());
2312 
2313  // Otherwise, emit the values in successive locations.
2314  unsigned ElementByteSize = CDS->getElementByteSize();
2315  if (isa<IntegerType>(CDS->getElementType())) {
2316  for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) {
2317  if (AP.isVerbose())
2318  AP.OutStreamer->GetCommentOS() << format("0x%" PRIx64 "\n",
2319  CDS->getElementAsInteger(i));
2320  AP.OutStreamer->EmitIntValue(CDS->getElementAsInteger(i),
2321  ElementByteSize);
2322  }
2323  } else {
2324  Type *ET = CDS->getElementType();
2325  for (unsigned I = 0, E = CDS->getNumElements(); I != E; ++I)
2327  }
2328 
2329  unsigned Size = DL.getTypeAllocSize(CDS->getType());
2330  unsigned EmittedSize = DL.getTypeAllocSize(CDS->getType()->getElementType()) *
2331  CDS->getNumElements();
2332  assert(EmittedSize <= Size && "Size cannot be less than EmittedSize!");
2333  if (unsigned Padding = Size - EmittedSize)
2334  AP.OutStreamer->EmitZeros(Padding);
2335 }
2336 
2337 static void emitGlobalConstantArray(const DataLayout &DL,
2338  const ConstantArray *CA, AsmPrinter &AP,
2339  const Constant *BaseCV, uint64_t Offset) {
2340  // See if we can aggregate some values. Make sure it can be
2341  // represented as a series of bytes of the constant value.
2342  int Value = isRepeatedByteSequence(CA, DL);
2343 
2344  if (Value != -1) {
2345  uint64_t Bytes = DL.getTypeAllocSize(CA->getType());
2346  AP.OutStreamer->emitFill(Bytes, Value);
2347  }
2348  else {
2349  for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i) {
2350  emitGlobalConstantImpl(DL, CA->getOperand(i), AP, BaseCV, Offset);
2351  Offset += DL.getTypeAllocSize(CA->getOperand(i)->getType());
2352  }
2353  }
2354 }
2355 
2356 static void emitGlobalConstantVector(const DataLayout &DL,
2357  const ConstantVector *CV, AsmPrinter &AP) {
2358  for (unsigned i = 0, e = CV->getType()->getNumElements(); i != e; ++i)
2359  emitGlobalConstantImpl(DL, CV->getOperand(i), AP);
2360 
2361  unsigned Size = DL.getTypeAllocSize(CV->getType());
2362  unsigned EmittedSize = DL.getTypeAllocSize(CV->getType()->getElementType()) *
2363  CV->getType()->getNumElements();
2364  if (unsigned Padding = Size - EmittedSize)
2365  AP.OutStreamer->EmitZeros(Padding);
2366 }
2367 
2368 static void emitGlobalConstantStruct(const DataLayout &DL,
2369  const ConstantStruct *CS, AsmPrinter &AP,
2370  const Constant *BaseCV, uint64_t Offset) {
2371  // Print the fields in successive locations. Pad to align if needed!
2372  unsigned Size = DL.getTypeAllocSize(CS->getType());
2373  const StructLayout *Layout = DL.getStructLayout(CS->getType());
2374  uint64_t SizeSoFar = 0;
2375  for (unsigned i = 0, e = CS->getNumOperands(); i != e; ++i) {
2376  const Constant *Field = CS->getOperand(i);
2377 
2378  // Print the actual field value.
2379  emitGlobalConstantImpl(DL, Field, AP, BaseCV, Offset + SizeSoFar);
2380 
2381  // Check if padding is needed and insert one or more 0s.
2382  uint64_t FieldSize = DL.getTypeAllocSize(Field->getType());
2383  uint64_t PadSize = ((i == e-1 ? Size : Layout->getElementOffset(i+1))
2384  - Layout->getElementOffset(i)) - FieldSize;
2385  SizeSoFar += FieldSize + PadSize;
2386 
2387  // Insert padding - this may include padding to increase the size of the
2388  // current field up to the ABI size (if the struct is not packed) as well
2389  // as padding to ensure that the next field starts at the right offset.
2390  AP.OutStreamer->EmitZeros(PadSize);
2391  }
2392  assert(SizeSoFar == Layout->getSizeInBytes() &&
2393  "Layout of constant struct may be incorrect!");
2394 }
2395 
2396 static void emitGlobalConstantFP(APFloat APF, Type *ET, AsmPrinter &AP) {
2397  APInt API = APF.bitcastToAPInt();
2398 
2399  // First print a comment with what we think the original floating-point value
2400  // should have been.
2401  if (AP.isVerbose()) {
2403  APF.toString(StrVal);
2404 
2405  if (ET)
2406  ET->print(AP.OutStreamer->GetCommentOS());
2407  else
2408  AP.OutStreamer->GetCommentOS() << "Printing <null> Type";
2409  AP.OutStreamer->GetCommentOS() << ' ' << StrVal << '\n';
2410  }
2411 
2412  // Now iterate through the APInt chunks, emitting them in endian-correct
2413  // order, possibly with a smaller chunk at beginning/end (e.g. for x87 80-bit
2414  // floats).
2415  unsigned NumBytes = API.getBitWidth() / 8;
2416  unsigned TrailingBytes = NumBytes % sizeof(uint64_t);
2417  const uint64_t *p = API.getRawData();
2418 
2419  // PPC's long double has odd notions of endianness compared to how LLVM
2420  // handles it: p[0] goes first for *big* endian on PPC.
2421  if (AP.getDataLayout().isBigEndian() && !ET->isPPC_FP128Ty()) {
2422  int Chunk = API.getNumWords() - 1;
2423 
2424  if (TrailingBytes)
2425  AP.OutStreamer->EmitIntValue(p[Chunk--], TrailingBytes);
2426 
2427  for (; Chunk >= 0; --Chunk)
2428  AP.OutStreamer->EmitIntValue(p[Chunk], sizeof(uint64_t));
2429  } else {
2430  unsigned Chunk;
2431  for (Chunk = 0; Chunk < NumBytes / sizeof(uint64_t); ++Chunk)
2432  AP.OutStreamer->EmitIntValue(p[Chunk], sizeof(uint64_t));
2433 
2434  if (TrailingBytes)
2435  AP.OutStreamer->EmitIntValue(p[Chunk], TrailingBytes);
2436  }
2437 
2438  // Emit the tail padding for the long double.
2439  const DataLayout &DL = AP.getDataLayout();
2440  AP.OutStreamer->EmitZeros(DL.getTypeAllocSize(ET) - DL.getTypeStoreSize(ET));
2441 }
2442 
2443 static void emitGlobalConstantFP(const ConstantFP *CFP, AsmPrinter &AP) {
2444  emitGlobalConstantFP(CFP->getValueAPF(), CFP->getType(), AP);
2445 }
2446 
2448  const DataLayout &DL = AP.getDataLayout();
2449  unsigned BitWidth = CI->getBitWidth();
2450 
2451  // Copy the value as we may massage the layout for constants whose bit width
2452  // is not a multiple of 64-bits.
2453  APInt Realigned(CI->getValue());
2454  uint64_t ExtraBits = 0;
2455  unsigned ExtraBitsSize = BitWidth & 63;
2456 
2457  if (ExtraBitsSize) {
2458  // The bit width of the data is not a multiple of 64-bits.
2459  // The extra bits are expected to be at the end of the chunk of the memory.
2460  // Little endian:
2461  // * Nothing to be done, just record the extra bits to emit.
2462  // Big endian:
2463  // * Record the extra bits to emit.
2464  // * Realign the raw data to emit the chunks of 64-bits.
2465  if (DL.isBigEndian()) {
2466  // Basically the structure of the raw data is a chunk of 64-bits cells:
2467  // 0 1 BitWidth / 64
2468  // [chunk1][chunk2] ... [chunkN].
2469  // The most significant chunk is chunkN and it should be emitted first.
2470  // However, due to the alignment issue chunkN contains useless bits.
2471  // Realign the chunks so that they contain only useless information:
2472  // ExtraBits 0 1 (BitWidth / 64) - 1
2473  // chu[nk1 chu][nk2 chu] ... [nkN-1 chunkN]
2474  ExtraBits = Realigned.getRawData()[0] &
2475  (((uint64_t)-1) >> (64 - ExtraBitsSize));
2476  Realigned.lshrInPlace(ExtraBitsSize);
2477  } else
2478  ExtraBits = Realigned.getRawData()[BitWidth / 64];
2479  }
2480 
2481  // We don't expect assemblers to support integer data directives
2482  // for more than 64 bits, so we emit the data in at most 64-bit
2483  // quantities at a time.
2484  const uint64_t *RawData = Realigned.getRawData();
2485  for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) {
2486  uint64_t Val = DL.isBigEndian() ? RawData[e - i - 1] : RawData[i];
2487  AP.OutStreamer->EmitIntValue(Val, 8);
2488  }
2489 
2490  if (ExtraBitsSize) {
2491  // Emit the extra bits after the 64-bits chunks.
2492 
2493  // Emit a directive that fills the expected size.
2494  uint64_t Size = AP.getDataLayout().getTypeAllocSize(CI->getType());
2495  Size -= (BitWidth / 64) * 8;
2496  assert(Size && Size * 8 >= ExtraBitsSize &&
2497  (ExtraBits & (((uint64_t)-1) >> (64 - ExtraBitsSize)))
2498  == ExtraBits && "Directive too small for extra bits.");
2499  AP.OutStreamer->EmitIntValue(ExtraBits, Size);
2500  }
2501 }
2502 
2503 /// Transform a not absolute MCExpr containing a reference to a GOT
2504 /// equivalent global, by a target specific GOT pc relative access to the
2505 /// final symbol.
2506 static void handleIndirectSymViaGOTPCRel(AsmPrinter &AP, const MCExpr **ME,
2507  const Constant *BaseCst,
2508  uint64_t Offset) {
2509  // The global @foo below illustrates a global that uses a got equivalent.
2510  //
2511  // @bar = global i32 42
2512  // @gotequiv = private unnamed_addr constant i32* @bar
2513  // @foo = i32 trunc (i64 sub (i64 ptrtoint (i32** @gotequiv to i64),
2514  // i64 ptrtoint (i32* @foo to i64))
2515  // to i32)
2516  //
2517  // The cstexpr in @foo is converted into the MCExpr `ME`, where we actually
2518  // check whether @foo is suitable to use a GOTPCREL. `ME` is usually in the
2519  // form:
2520  //
2521  // foo = cstexpr, where
2522  // cstexpr := <gotequiv> - "." + <cst>
2523  // cstexpr := <gotequiv> - (<foo> - <offset from @foo base>) + <cst>
2524  //
2525  // After canonicalization by evaluateAsRelocatable `ME` turns into:
2526  //
2527  // cstexpr := <gotequiv> - <foo> + gotpcrelcst, where
2528  // gotpcrelcst := <offset from @foo base> + <cst>
2529  MCValue MV;
2530  if (!(*ME)->evaluateAsRelocatable(MV, nullptr, nullptr) || MV.isAbsolute())
2531  return;
2532  const MCSymbolRefExpr *SymA = MV.getSymA();
2533  if (!SymA)
2534  return;
2535 
2536  // Check that GOT equivalent symbol is cached.
2537  const MCSymbol *GOTEquivSym = &SymA->getSymbol();
2538  if (!AP.GlobalGOTEquivs.count(GOTEquivSym))
2539  return;
2540 
2541  const GlobalValue *BaseGV = dyn_cast_or_null<GlobalValue>(BaseCst);
2542  if (!BaseGV)
2543  return;
2544 
2545  // Check for a valid base symbol
2546  const MCSymbol *BaseSym = AP.getSymbol(BaseGV);
2547  const MCSymbolRefExpr *SymB = MV.getSymB();
2548 
2549  if (!SymB || BaseSym != &SymB->getSymbol())
2550  return;
2551 
2552  // Make sure to match:
2553  //
2554  // gotpcrelcst := <offset from @foo base> + <cst>
2555  //
2556  // If gotpcrelcst is positive it means that we can safely fold the pc rel
2557  // displacement into the GOTPCREL. We can also can have an extra offset <cst>
2558  // if the target knows how to encode it.
2559  int64_t GOTPCRelCst = Offset + MV.getConstant();
2560  if (GOTPCRelCst < 0)
2561  return;
2562  if (!AP.getObjFileLowering().supportGOTPCRelWithOffset() && GOTPCRelCst != 0)
2563  return;
2564 
2565  // Emit the GOT PC relative to replace the got equivalent global, i.e.:
2566  //
2567  // bar:
2568  // .long 42
2569  // gotequiv:
2570  // .quad bar
2571  // foo:
2572  // .long gotequiv - "." + <cst>
2573  //
2574  // is replaced by the target specific equivalent to:
2575  //
2576  // bar:
2577  // .long 42
2578  // foo:
2579  // .long bar@GOTPCREL+<gotpcrelcst>
2581  const GlobalVariable *GV = Result.first;
2582  int NumUses = (int)Result.second;
2583  const GlobalValue *FinalGV = dyn_cast<GlobalValue>(GV->getOperand(0));
2584  const MCSymbol *FinalSym = AP.getSymbol(FinalGV);
2586  FinalSym, MV, Offset, AP.MMI, *AP.OutStreamer);
2587 
2588  // Update GOT equivalent usage information
2589  --NumUses;
2590  if (NumUses >= 0)
2591  AP.GlobalGOTEquivs[GOTEquivSym] = std::make_pair(GV, NumUses);
2592 }
2593 
2594 static void emitGlobalConstantImpl(const DataLayout &DL, const Constant *CV,
2595  AsmPrinter &AP, const Constant *BaseCV,
2596  uint64_t Offset) {
2597  uint64_t Size = DL.getTypeAllocSize(CV->getType());
2598 
2599  // Globals with sub-elements such as combinations of arrays and structs
2600  // are handled recursively by emitGlobalConstantImpl. Keep track of the
2601  // constant symbol base and the current position with BaseCV and Offset.
2602  if (!BaseCV && CV->hasOneUse())
2603  BaseCV = dyn_cast<Constant>(CV->user_back());
2604 
2605  if (isa<ConstantAggregateZero>(CV) || isa<UndefValue>(CV))
2606  return AP.OutStreamer->EmitZeros(Size);
2607 
2608  if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
2609  switch (Size) {
2610  case 1:
2611  case 2:
2612  case 4:
2613  case 8:
2614  if (AP.isVerbose())
2615  AP.OutStreamer->GetCommentOS() << format("0x%" PRIx64 "\n",
2616  CI->getZExtValue());
2617  AP.OutStreamer->EmitIntValue(CI->getZExtValue(), Size);
2618  return;
2619  default:
2621  return;
2622  }
2623  }
2624 
2625  if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV))
2626  return emitGlobalConstantFP(CFP, AP);
2627 
2628  if (isa<ConstantPointerNull>(CV)) {
2629  AP.OutStreamer->EmitIntValue(0, Size);
2630  return;
2631  }
2632 
2633  if (const ConstantDataSequential *CDS = dyn_cast<ConstantDataSequential>(CV))
2634  return emitGlobalConstantDataSequential(DL, CDS, AP);
2635 
2636  if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV))
2637  return emitGlobalConstantArray(DL, CVA, AP, BaseCV, Offset);
2638 
2639  if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV))
2640  return emitGlobalConstantStruct(DL, CVS, AP, BaseCV, Offset);
2641 
2642  if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) {
2643  // Look through bitcasts, which might not be able to be MCExpr'ized (e.g. of
2644  // vectors).
2645  if (CE->getOpcode() == Instruction::BitCast)
2646  return emitGlobalConstantImpl(DL, CE->getOperand(0), AP);
2647 
2648  if (Size > 8) {
2649  // If the constant expression's size is greater than 64-bits, then we have
2650  // to emit the value in chunks. Try to constant fold the value and emit it
2651  // that way.
2652  Constant *New = ConstantFoldConstant(CE, DL);
2653  if (New && New != CE)
2654  return emitGlobalConstantImpl(DL, New, AP);
2655  }
2656  }
2657 
2658  if (const ConstantVector *V = dyn_cast<ConstantVector>(CV))
2659  return emitGlobalConstantVector(DL, V, AP);
2660 
2661  // Otherwise, it must be a ConstantExpr. Lower it to an MCExpr, then emit it
2662  // thread the streamer with EmitValue.
2663  const MCExpr *ME = AP.lowerConstant(CV);
2664 
2665  // Since lowerConstant already folded and got rid of all IR pointer and
2666  // integer casts, detect GOT equivalent accesses by looking into the MCExpr
2667  // directly.
2669  handleIndirectSymViaGOTPCRel(AP, &ME, BaseCV, Offset);
2670 
2671  AP.OutStreamer->EmitValue(ME, Size);
2672 }
2673 
2674 /// EmitGlobalConstant - Print a general LLVM constant to the .s file.
2676  uint64_t Size = DL.getTypeAllocSize(CV->getType());
2677  if (Size)
2678  emitGlobalConstantImpl(DL, CV, *this);
2679  else if (MAI->hasSubsectionsViaSymbols()) {
2680  // If the global has zero size, emit a single byte so that two labels don't
2681  // look like they are at the same location.
2682  OutStreamer->EmitIntValue(0, 1);
2683  }
2684 }
2685 
2687  // Target doesn't support this yet!
2688  llvm_unreachable("Target does not support EmitMachineConstantPoolValue");
2689 }
2690 
2691 void AsmPrinter::printOffset(int64_t Offset, raw_ostream &OS) const {
2692  if (Offset > 0)
2693  OS << '+' << Offset;
2694  else if (Offset < 0)
2695  OS << Offset;
2696 }
2697 
2698 //===----------------------------------------------------------------------===//
2699 // Symbol Lowering Routines.
2700 //===----------------------------------------------------------------------===//
2701 
2703  return OutContext.createTempSymbol(Name, true);
2704 }
2705 
2707  return MMI->getAddrLabelSymbol(BA->getBasicBlock());
2708 }
2709 
2711  return MMI->getAddrLabelSymbol(BB);
2712 }
2713 
2714 /// GetCPISymbol - Return the symbol for the specified constant pool entry.
2715 MCSymbol *AsmPrinter::GetCPISymbol(unsigned CPID) const {
2716  if (getSubtargetInfo().getTargetTriple().isKnownWindowsMSVCEnvironment()) {
2717  const MachineConstantPoolEntry &CPE =
2718  MF->getConstantPool()->getConstants()[CPID];
2719  if (!CPE.isMachineConstantPoolEntry()) {
2720  const DataLayout &DL = MF->getDataLayout();
2721  SectionKind Kind = CPE.getSectionKind(&DL);
2722  const Constant *C = CPE.Val.ConstVal;
2723  unsigned Align = CPE.Alignment;
2724  if (const MCSectionCOFF *S = dyn_cast<MCSectionCOFF>(
2725  getObjFileLowering().getSectionForConstant(DL, Kind, C, Align))) {
2726  if (MCSymbol *Sym = S->getCOMDATSymbol()) {
2727  if (Sym->isUndefined())
2728  OutStreamer->EmitSymbolAttribute(Sym, MCSA_Global);
2729  return Sym;
2730  }
2731  }
2732  }
2733  }
2734 
2735  const DataLayout &DL = getDataLayout();
2737  "CPI" + Twine(getFunctionNumber()) + "_" +
2738  Twine(CPID));
2739 }
2740 
2741 /// GetJTISymbol - Return the symbol for the specified jump table entry.
2742 MCSymbol *AsmPrinter::GetJTISymbol(unsigned JTID, bool isLinkerPrivate) const {
2743  return MF->getJTISymbol(JTID, OutContext, isLinkerPrivate);
2744 }
2745 
2746 /// GetJTSetSymbol - Return the symbol for the specified jump table .set
2747 /// FIXME: privatize to AsmPrinter.
2748 MCSymbol *AsmPrinter::GetJTSetSymbol(unsigned UID, unsigned MBBID) const {
2749  const DataLayout &DL = getDataLayout();
2751  Twine(getFunctionNumber()) + "_" +
2752  Twine(UID) + "_set_" + Twine(MBBID));
2753 }
2754 
2756  StringRef Suffix) const {
2757  return getObjFileLowering().getSymbolWithGlobalValueBase(GV, Suffix, TM);
2758 }
2759 
2760 /// Return the MCSymbol for the specified ExternalSymbol.
2762  SmallString<60> NameStr;
2763  Mangler::getNameWithPrefix(NameStr, Sym, getDataLayout());
2764  return OutContext.getOrCreateSymbol(NameStr);
2765 }
2766 
2767 /// PrintParentLoopComment - Print comments about parent loops of this one.
2769  unsigned FunctionNumber) {
2770  if (!Loop) return;
2772  OS.indent(Loop->getLoopDepth()*2)
2773  << "Parent Loop BB" << FunctionNumber << "_"
2774  << Loop->getHeader()->getNumber()
2775  << " Depth=" << Loop->getLoopDepth() << '\n';
2776 }
2777 
2778 /// PrintChildLoopComment - Print comments about child loops within
2779 /// the loop for this basic block, with nesting.
2781  unsigned FunctionNumber) {
2782  // Add child loop information
2783  for (const MachineLoop *CL : *Loop) {
2784  OS.indent(CL->getLoopDepth()*2)
2785  << "Child Loop BB" << FunctionNumber << "_"
2786  << CL->getHeader()->getNumber() << " Depth " << CL->getLoopDepth()
2787  << '\n';
2788  PrintChildLoopComment(OS, CL, FunctionNumber);
2789  }
2790 }
2791 
2792 /// emitBasicBlockLoopComments - Pretty-print comments for basic blocks.
2794  const MachineLoopInfo *LI,
2795  const AsmPrinter &AP) {
2796  // Add loop depth information
2797  const MachineLoop *Loop = LI->getLoopFor(&MBB);
2798  if (!Loop) return;
2799 
2800  MachineBasicBlock *Header = Loop->getHeader();
2801  assert(Header && "No header for loop");
2802 
2803  // If this block is not a loop header, just print out what is the loop header
2804  // and return.
2805  if (Header != &MBB) {
2806  AP.OutStreamer->AddComment(" in Loop: Header=BB" +
2807  Twine(AP.getFunctionNumber())+"_" +
2808  Twine(Loop->getHeader()->getNumber())+
2809  " Depth="+Twine(Loop->getLoopDepth()));
2810  return;
2811  }
2812 
2813  // Otherwise, it is a loop header. Print out information about child and
2814  // parent loops.
2815  raw_ostream &OS = AP.OutStreamer->GetCommentOS();
2816 
2818 
2819  OS << "=>";
2820  OS.indent(Loop->getLoopDepth()*2-2);
2821 
2822  OS << "This ";
2823  if (Loop->empty())
2824  OS << "Inner ";
2825  OS << "Loop Header: Depth=" + Twine(Loop->getLoopDepth()) << '\n';
2826 
2827  PrintChildLoopComment(OS, Loop, AP.getFunctionNumber());
2828 }
2829 
2830 void AsmPrinter::setupCodePaddingContext(const MachineBasicBlock &MBB,
2831  MCCodePaddingContext &Context) const {
2832  assert(MF != nullptr && "Machine function must be valid");
2833  Context.IsPaddingActive = !MF->hasInlineAsm() &&
2834  !MF->getFunction().optForSize() &&
2837  std::find(MBB.pred_begin(), MBB.pred_end(), MBB.getPrevNode()) !=
2838  MBB.pred_end();
2840  MBB.pred_size() > 0 && !isBlockOnlyReachableByFallthrough(&MBB);
2841 }
2842 
2843 /// EmitBasicBlockStart - This method prints the label for the specified
2844 /// MachineBasicBlock, an alignment (if present) and a comment describing
2845 /// it if appropriate.
2847  // End the previous funclet and start a new one.
2848  if (MBB.isEHFuncletEntry()) {
2849  for (const HandlerInfo &HI : Handlers) {
2850  HI.Handler->endFunclet();
2851  HI.Handler->beginFunclet(MBB);
2852  }
2853  }
2854 
2855  // Emit an alignment directive for this block, if needed.
2856  if (unsigned Align = MBB.getAlignment())
2859  setupCodePaddingContext(MBB, Context);
2860  OutStreamer->EmitCodePaddingBasicBlockStart(Context);
2861 
2862  // If the block has its address taken, emit any labels that were used to
2863  // reference the block. It is possible that there is more than one label
2864  // here, because multiple LLVM BB's may have been RAUW'd to this block after
2865  // the references were generated.
2866  if (MBB.hasAddressTaken()) {
2867  const BasicBlock *BB = MBB.getBasicBlock();
2868  if (isVerbose())
2869  OutStreamer->AddComment("Block address taken");
2870 
2871  // MBBs can have their address taken as part of CodeGen without having
2872  // their corresponding BB's address taken in IR
2873  if (BB->hasAddressTaken())
2874  for (MCSymbol *Sym : MMI->getAddrLabelSymbolToEmit(BB))
2875  OutStreamer->EmitLabel(Sym);
2876  }
2877 
2878  // Print some verbose block comments.
2879  if (isVerbose()) {
2880  if (const BasicBlock *BB = MBB.getBasicBlock()) {
2881  if (BB->hasName()) {
2882  BB->printAsOperand(OutStreamer->GetCommentOS(),
2883  /*PrintType=*/false, BB->getModule());
2884  OutStreamer->GetCommentOS() << '\n';
2885  }
2886  }
2887 
2888  assert(MLI != nullptr && "MachineLoopInfo should has been computed");
2889  emitBasicBlockLoopComments(MBB, MLI, *this);
2890  }
2891 
2892  // Print the main label for the block.
2893  if (MBB.pred_empty() ||
2895  if (isVerbose()) {
2896  // NOTE: Want this comment at start of line, don't emit with AddComment.
2897  OutStreamer->emitRawComment(" %bb." + Twine(MBB.getNumber()) + ":",
2898  false);
2899  }
2900  } else {
2901  OutStreamer->EmitLabel(MBB.getSymbol());
2902  }
2903 }
2904 
2907  setupCodePaddingContext(MBB, Context);
2908  OutStreamer->EmitCodePaddingBasicBlockEnd(Context);
2909 }
2910 
2911 void AsmPrinter::EmitVisibility(MCSymbol *Sym, unsigned Visibility,
2912  bool IsDefinition) const {
2913  MCSymbolAttr Attr = MCSA_Invalid;
2914 
2915  switch (Visibility) {
2916  default: break;
2918  if (IsDefinition)
2919  Attr = MAI->getHiddenVisibilityAttr();
2920  else
2922  break;
2924  Attr = MAI->getProtectedVisibilityAttr();
2925  break;
2926  }
2927 
2928  if (Attr != MCSA_Invalid)
2929  OutStreamer->EmitSymbolAttribute(Sym, Attr);
2930 }
2931 
2932 /// isBlockOnlyReachableByFallthough - Return true if the basic block has
2933 /// exactly one predecessor and the control transfer mechanism between
2934 /// the predecessor and this block is a fall-through.
2935 bool AsmPrinter::
2937  // If this is a landing pad, it isn't a fall through. If it has no preds,
2938  // then nothing falls through to it.
2939  if (MBB->isEHPad() || MBB->pred_empty())
2940  return false;
2941 
2942  // If there isn't exactly one predecessor, it can't be a fall through.
2943  if (MBB->pred_size() > 1)
2944  return false;
2945 
2946  // The predecessor has to be immediately before this block.
2947  MachineBasicBlock *Pred = *MBB->pred_begin();
2948  if (!Pred->isLayoutSuccessor(MBB))
2949  return false;
2950 
2951  // If the block is completely empty, then it definitely does fall through.
2952  if (Pred->empty())
2953  return true;
2954 
2955  // Check the terminators in the previous blocks
2956  for (const auto &MI : Pred->terminators()) {
2957  // If it is not a simple branch, we are in a table somewhere.
2958  if (!MI.isBranch() || MI.isIndirectBranch())
2959  return false;
2960 
2961  // If we are the operands of one of the branches, this is not a fall
2962  // through. Note that targets with delay slots will usually bundle
2963  // terminators with the delay slot instruction.
2964  for (ConstMIBundleOperands OP(MI); OP.isValid(); ++OP) {
2965  if (OP->isJTI())
2966  return false;
2967  if (OP->isMBB() && OP->getMBB() == MBB)
2968  return false;
2969  }
2970  }
2971 
2972  return true;
2973 }
2974 
2975 GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy &S) {
2976  if (!S.usesMetadata())
2977  return nullptr;
2978 
2979  assert(!S.useStatepoints() && "statepoints do not currently support custom"
2980  " stackmap formats, please see the documentation for a description of"
2981  " the default format. If you really need a custom serialized format,"
2982  " please file a bug");
2983 
2984  gcp_map_type &GCMap = getGCMap(GCMetadataPrinters);
2985  gcp_map_type::iterator GCPI = GCMap.find(&S);
2986  if (GCPI != GCMap.end())
2987  return GCPI->second.get();
2988 
2989  auto Name = S.getName();
2990 
2993  E = GCMetadataPrinterRegistry::end(); I != E; ++I)
2994  if (Name == I->getName()) {
2995  std::unique_ptr<GCMetadataPrinter> GMP = I->instantiate();
2996  GMP->S = &S;
2997  auto IterBool = GCMap.insert(std::make_pair(&S, std::move(GMP)));
2998  return IterBool.first->second.get();
2999  }
3000 
3001  report_fatal_error("no GCMetadataPrinter registered for GC: " + Twine(Name));
3002 }
3003 
3004 /// Pin vtable to this file.
3006 
3008 
3009 // In the binary's "xray_instr_map" section, an array of these function entries
3010 // describes each instrumentation point. When XRay patches your code, the index
3011 // into this table will be given to your handler as a patch point identifier.
3013  const MCSymbol *CurrentFnSym) const {
3014  Out->EmitSymbolValue(Sled, Bytes);
3015  Out->EmitSymbolValue(CurrentFnSym, Bytes);
3016  auto Kind8 = static_cast<uint8_t>(Kind);
3017  Out->EmitBinaryData(StringRef(reinterpret_cast<const char *>(&Kind8), 1));
3018  Out->EmitBinaryData(
3019  StringRef(reinterpret_cast<const char *>(&AlwaysInstrument), 1));
3020  Out->EmitBinaryData(StringRef(reinterpret_cast<const char *>(&Version), 1));
3021  auto Padding = (4 * Bytes) - ((2 * Bytes) + 3);
3022  assert(Padding >= 0 && "Instrumentation map entry > 4 * Word Size");
3023  Out->EmitZeros(Padding);
3024 }
3025 
3027  if (Sleds.empty())
3028  return;
3029 
3030  auto PrevSection = OutStreamer->getCurrentSectionOnly();
3031  const Function &F = MF->getFunction();
3032  MCSection *InstMap = nullptr;
3033  MCSection *FnSledIndex = nullptr;
3035  auto Associated = dyn_cast<MCSymbolELF>(CurrentFnSym);
3036  assert(Associated != nullptr);
3038  std::string GroupName;
3039  if (F.hasComdat()) {
3040  Flags |= ELF::SHF_GROUP;
3041  GroupName = F.getComdat()->getName();
3042  }
3043 
3044  auto UniqueID = ++XRayFnUniqueID;
3045  InstMap =
3046  OutContext.getELFSection("xray_instr_map", ELF::SHT_PROGBITS, Flags, 0,
3047  GroupName, UniqueID, Associated);
3048  FnSledIndex =
3049  OutContext.getELFSection("xray_fn_idx", ELF::SHT_PROGBITS, Flags, 0,
3050  GroupName, UniqueID, Associated);
3051  } else if (MF->getSubtarget().getTargetTriple().isOSBinFormatMachO()) {
3052  InstMap = OutContext.getMachOSection("__DATA", "xray_instr_map", 0,
3054  FnSledIndex = OutContext.getMachOSection("__DATA", "xray_fn_idx", 0,
3056  } else {
3057  llvm_unreachable("Unsupported target");
3058  }
3059 
3060  auto WordSizeBytes = MAI->getCodePointerSize();
3061 
3062  // Now we switch to the instrumentation map section. Because this is done
3063  // per-function, we are able to create an index entry that will represent the
3064  // range of sleds associated with a function.
3065  MCSymbol *SledsStart = OutContext.createTempSymbol("xray_sleds_start", true);
3066  OutStreamer->SwitchSection(InstMap);
3067  OutStreamer->EmitLabel(SledsStart);
3068  for (const auto &Sled : Sleds)
3069  Sled.emit(WordSizeBytes, OutStreamer.get(), CurrentFnSym);
3070  MCSymbol *SledsEnd = OutContext.createTempSymbol("xray_sleds_end", true);
3071  OutStreamer->EmitLabel(SledsEnd);
3072 
3073  // We then emit a single entry in the index per function. We use the symbols
3074  // that bound the instrumentation map as the range for a specific function.
3075  // Each entry here will be 2 * word size aligned, as we're writing down two
3076  // pointers. This should work for both 32-bit and 64-bit platforms.
3077  OutStreamer->SwitchSection(FnSledIndex);
3078  OutStreamer->EmitCodeAlignment(2 * WordSizeBytes);
3079  OutStreamer->EmitSymbolValue(SledsStart, WordSizeBytes, false);
3080  OutStreamer->EmitSymbolValue(SledsEnd, WordSizeBytes, false);
3081  OutStreamer->SwitchSection(PrevSection);
3082  Sleds.clear();
3083 }
3084 
3086  SledKind Kind, uint8_t Version) {
3087  const Function &F = MI.getMF()->getFunction();
3088  auto Attr = F.getFnAttribute("function-instrument");
3089  bool LogArgs = F.hasFnAttribute("xray-log-args");
3090  bool AlwaysInstrument =
3091  Attr.isStringAttribute() && Attr.getValueAsString() == "xray-always";
3092  if (Kind == SledKind::FUNCTION_ENTER && LogArgs)
3093  Kind = SledKind::LOG_ARGS_ENTER;
3094  Sleds.emplace_back(XRayFunctionEntry{Sled, CurrentFnSym, Kind,
3095  AlwaysInstrument, &F, Version});
3096 }
3097 
3099  return OutStreamer->getContext().getDwarfVersion();
3100 }
3101 
3103  OutStreamer->getContext().setDwarfVersion(Version);
3104 }
virtual void EmitGlobalVariable(const GlobalVariable *GV)
Emit the specified global variable to the .s file.
Definition: AsmPrinter.cpp:433
const Function & getFunction() const
Definition: Function.h:134
void setDwarfVersion(uint16_t Version)
bool isDeclarationForLinker() const
Definition: GlobalValue.h:524
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:210
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:218
bool doesSetDirectiveSuppressReloc() const
Definition: MCAsmInfo.h:524
void emitInt64(uint64_t Value) const
Emit a long long directive and value.
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:377
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:584
MCSymbolAttr getHiddenVisibilityAttr() const
Definition: MCAsmInfo.h:554
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:436
unsigned getOpcode() const
Return the opcode at the root of this constant expression.
Definition: Constants.h:1199
Special purpose, only applies to global arrays.
Definition: GlobalValue.h:55
uint64_t getZExtValue() const
Get zero extended value.
Definition: APInt.h:1557
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:267
std::unique_ptr< MCStreamer > OutStreamer
This is the MCStreamer object for the file we are generating.
Definition: AsmPrinter.h:93
bool hasDebugInfo() const
Returns true if valid debug info is present.
unsigned getFunctionNumber() const
getFunctionNumber - Return a unique ID for the current function.
MCSymbol * GetExternalSymbolSymbol(StringRef Sym) const
Return the MCSymbol for the specified ExternalSymbol.
static const MCSymbolRefExpr * create(const MCSymbol *Symbol, MCContext &Ctx)
Definition: MCExpr.h:322
static const char *const DbgTimerDescription
Definition: AsmPrinter.cpp:133
MCTargetOptions MCOptions
Machine level options.
virtual MCSection * getStaticCtorSection(unsigned Priority, const MCSymbol *KeySym) const
bool hasPrivateLinkage() const
Definition: GlobalValue.h:435
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:139
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:147
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...
bool hasMachoTBSSDirective() const
Definition: MCAsmInfo.h:474
StringRef getPrivateGlobalPrefix() const
Definition: DataLayout.h:294
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:64
void redefineIfPossible()
Prepare this symbol to be redefined.
Definition: MCSymbol.h:230
MCSection * getTLSBSSSection() const
#define LLVM_FALLTHROUGH
Definition: Compiler.h:86
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:620
bool doesSupportDebugInformation() const
Definition: MCAsmInfo.h:564
bool hasSingleParameterDotFile() const
Definition: MCAsmInfo.h:540
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:592
virtual int getFrameIndexReference(const MachineFunction &MF, int FI, unsigned &FrameReg) const
getFrameIndexReference - This method should return the base register and offset used to reference a f...
MCContext & OutContext
This is the context for the output file that we are streaming.
Definition: AsmPrinter.h:88
static cl::opt< bool > PrintSchedule("print-schedule", cl::Hidden, cl::init(false), cl::desc("Print 'sched: [latency:throughput]' in .s output"))
virtual const TargetRegisterInfo * getRegisterInfo() const
getRegisterInfo - If register information is available, return it.
bool hasLinkOnceDirective() const
Definition: MCAsmInfo.h:552
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:1510
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:588
bool EnablePrintSchedInfo
Enable print [latency:throughput] in output.
Definition: AsmPrinter.h:125
const MCSubtargetInfo & getSubtargetInfo() const
Return information about subtarget.
Definition: AsmPrinter.cpp:224
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:952
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:281
unsigned Reg
bool hasAvailableExternallyLinkage() const
Definition: GlobalValue.h:423
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:414
This file contains the declarations for metadata subclasses.
EK_Inline - Jump table entries are emitted inline at their point of use.
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:539
bool needsDwarfSectionOffsetDirective() const
Definition: MCAsmInfo.h:467
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:2399
This file contains the declaration of the Comdat class, which represents a single COMDAT in LLVM...
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:128
bool hasPrologueData() const
Check whether this function has prologue data.
Definition: Function.h:720
bool isAbsolute() const
Is this an absolute (as opposed to relocatable) value.
Definition: MCValue.h:53
static const char *const DWARFGroupName
Definition: AsmPrinter.cpp:130
bool hasFnAttribute(Attribute::AttrKind Kind) const
Return true if the function has the attribute.
Definition: Function.h:321
A raw_ostream that writes to an SmallVector or SmallString.
Definition: raw_ostream.h:510
virtual void EmitConstantPool()
Print to the current output stream assembly representations of the constants in the constant pool MCP...
bool hasDLLImportStorageClass() const
Definition: GlobalValue.h:262
STATISTIC(NumFunctions, "Total number of functions")
Metadata node.
Definition: Metadata.h:864
static const MCBinaryExpr * createAnd(const MCExpr *LHS, const MCExpr *RHS, MCContext &Ctx)
Definition: MCExpr.h:465
unsigned getProgramPointerSize() const
F(f)
MachineFunction * MF
The current machine function.
Definition: AsmPrinter.h:96
setjmp/longjmp based exceptions
const MDOperand & getOperand(unsigned I) const
Definition: Metadata.h:1069
ELFYAML::ELF_STV Visibility
Definition: ELFYAML.cpp:772
APInt zextOrTrunc(unsigned width) const
Zero extend or truncate to width.
Definition: APInt.cpp:876
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:515
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:121
static void emitKill(const MachineInstr *MI, AsmPrinter &AP)
Definition: AsmPrinter.cpp:824
static const char *const DWARFGroupDescription
Definition: AsmPrinter.cpp:131
bool isImm() const
isImm - Tests if this is a MO_Immediate operand.
bool hasIdentDirective() const
Definition: MCAsmInfo.h:541
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:150
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:473
WinEH::EncodingType getWinEHEncodingType() const
Definition: MCAsmInfo.h:571
virtual void EmitInstruction(const MCInst &Inst, const MCSubtargetInfo &STI, bool PrintSchedInfo=false)
Emit the given Instruction into the current section.
Definition: MCStreamer.cpp:915
bool canBeOmittedFromSymbolTable() const
True if GV can be left out of the object symbol table.
Definition: Globals.cpp:289
unsigned getBitWidth() const
Return the number of bits in the APInt.
Definition: APInt.h:1503
Constant * getPrologueData() const
Get the prologue data associated with this function.
Definition: Function.cpp:1322
MCSectionCOFF * getCOFFSection(StringRef Section, unsigned Characteristics, SectionKind Kind, StringRef COMDATSymName, int Selection, unsigned UniqueID=GenericSectionID, const char *BeginSymName=nullptr)
Definition: MCContext.cpp:422
virtual MCSection * getStaticDtorSection(unsigned Priority, const MCSymbol *KeySym) const
const Triple & getTargetTriple() const
This represents a section on Windows.
Definition: MCSectionCOFF.h:27
The address of a basic block.
Definition: Constants.h:836
void emit(DiagnosticInfoOptimizationBase &OptDiag)
Emit an optimization remark.
static const MCBinaryExpr * createXor(const MCExpr *LHS, const MCExpr *RHS, MCContext &Ctx)
Definition: MCExpr.h:550
bool hasSection() const
Definition: GlobalValue.h:270
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:521
void recordSled(MCSymbol *Sled, const MachineInstr &MI, SledKind Kind, uint8_t Version=0)
const MCSymbolRefExpr * getSymB() const
Definition: MCValue.h:49
virtual void EmitDebugThreadLocal(const MCExpr *Value, unsigned Size) const
Emit the directive and value for debug thread local expression.
Definition: AsmPrinter.cpp:631
static void emitGlobalConstantFP(const ConstantFP *CFP, AsmPrinter &AP)
A tuple of MDNodes.
Definition: Metadata.h:1326
bool hasPrefixData() const
Check whether this function has prefix data.
Definition: Function.h:711
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:1590
amdgpu Simplify well known AMD library false Value Value const Twine & Name
Definition: BitVector.h:938
Emits exception handling directives.
Definition: EHStreamer.h:31
SymbolListTy GetGVStubList()
Accessor methods to return the set of stubs in sorted order.
StringRef getName() const
MCSymbol * createLinkerPrivateTempSymbol()
Create and return a new linker temporary symbol with a unique but unspecified name.
Definition: MCContext.cpp:211
bool isMachineConstantPoolEntry() const
isMachineConstantPoolEntry - Return true if the MachineConstantPoolEntry is indeed a target specific ...
Type * getPointerElementType() const
Definition: Type.h:376
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:364
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:381
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:380
MachineModuleInfoCOFF - This is a MachineModuleInfoImpl implementation for COFF targets.
const ConstantFP * getFPImm() const
unsigned getNumOperands() const
Retuns the total number of operands.
Definition: MachineInstr.h:412
Printable printReg(unsigned Reg, const TargetRegisterInfo *TRI=nullptr, unsigned SubIdx=0, const MachineRegisterInfo *MRI=nullptr)
Prints virtual and physical registers with or without a TRI instance.
StringRef getRawDataValues() const
Return the raw, underlying, bytes of this data.
Definition: Constants.cpp:2373
Class to represent struct types.
Definition: DerivedTypes.h:201
This class is basically a combination of TimeRegion and Timer.
Definition: Timer.h:161
const TargetMachine & getTarget() const
getTarget - Return the target machine this machine code is compiled with
bool isConstant() const
If the value is a global constant, its value is immutable throughout the runtime execution of the pro...
virtual void emitModuleMetadata(MCStreamer &Streamer, Module &M) const
Emit the module-level metadata that the platform cares about.
static const MCBinaryExpr * createDiv(const MCExpr *LHS, const MCExpr *RHS, MCContext &Ctx)
Definition: MCExpr.h:470
Base class for the full range of assembler expressions which are needed for parsing.
Definition: MCExpr.h:36
bool hasAtLeastLocalUnnamedAddr() const
Returns true if this value&#39;s address is not significant in this module.
Definition: GlobalValue.h:209
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:166
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:264
.local (ELF)
Definition: MCDirectives.h:35
An analysis pass which caches information about the entire Module.
Definition: GCMetadata.h:154
MCSection * getDataSection() const
MCSection * getStackSizesSection(const MCSection &TextSec) const
const char * getWeakRefDirective() const
Definition: MCAsmInfo.h:545
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:440
INLINEASM - Represents an inline asm block.
Definition: ISDOpcodes.h:628
Constant * getPrefixData() const
Get the prefix data associated with this function.
Definition: Function.cpp:1312
BlockT * getHeader() const
Definition: LoopInfo.h:100
static const char *const CodeViewLineTablesGroupName
Definition: AsmPrinter.cpp:138
unsigned getPointerSize() const
Return the pointer size from the TargetMachine.
Definition: AsmPrinter.cpp:220
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:63
auto reverse(ContainerTy &&C, typename std::enable_if< has_rbegin< ContainerTy >::value >::type *=nullptr) -> decltype(make_range(C.rbegin(), C.rend()))
Definition: STLExtras.h:251
bool hasExternalLinkage() const
Definition: GlobalValue.h:422
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)
static const MCBinaryExpr * createShl(const MCExpr *LHS, const MCExpr *RHS, MCContext &Ctx)
Definition: MCExpr.h:530
LLVM_NODISCARD LLVM_ATTRIBUTE_ALWAYS_INLINE bool startswith(StringRef Prefix) const
Check if this string starts with the given Prefix.
Definition: StringRef.h:267
void getAnalysisUsage(AnalysisUsage &AU) const override
Record analysis usage.
Definition: AsmPrinter.cpp:238
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:885
void EmitFunctionBody()
This method emits the body and trailer for a function.
int64_t getSExtValue() const
Get sign extended value.
Definition: APInt.h:1569
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:4444
static const MCBinaryExpr * createSub(const MCExpr *LHS, const MCExpr *RHS, MCContext &Ctx)
Definition: MCExpr.h:545
MCSymbol * getFunctionBegin() const
Definition: AsmPrinter.h:208
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:273
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:201
EK_LabelDifference32 - Each entry is the address of the block minus the address of the jump table...
bool supportGOTPCRelWithOffset() const
Target GOT "PC"-relative relocation supports encoding an additional binary expression with an offset...
#define T
.type _foo, STT_GNU_IFUNC
Definition: MCDirectives.h:24
VisibilityTypes
An enumeration for the kinds of visibility of global values.
Definition: GlobalValue.h:63
.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:245
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:863
bool isFPImm() const
isFPImm - Tests if this is a MO_FPImmediate operand.
bool hasFunctionAlignment() const
Definition: MCAsmInfo.h:538
bool hasPersonalityFn() const
Check whether this function has a personality function.
Definition: Function.h:702
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:451
virtual void EmitBinaryData(StringRef Data)
Functionally identical to EmitBytes.
Definition: MCStreamer.cpp:978
virtual const TargetInstrInfo * getInstrInfo() const
static const fltSemantics & IEEEdouble() LLVM_READNONE
Definition: APFloat.cpp:123
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:460
bool hasLinkOnceLinkage() const
Definition: GlobalValue.h:426
std::string getSchedInfoStr(const MachineInstr &MI) const
Returns string representation of scheduler comment.
bool isVerbose() const
Return true if assembly output should contain comments.
Definition: AsmPrinter.h:199
bool hasNoDeadStrip() const
Definition: MCAsmInfo.h:542
const std::string & str() const
Definition: Triple.h:358
Type * getElementType() const
Return the element type of the array/vector.
Definition: Constants.cpp:2369
void emitGlobalGOTEquivs()
Constant expressions using GOT equivalent globals may not be eligible for PC relative GOT entry conve...
MachineModuleInfo * MMI
This is a pointer to the current MachineModuleInfo.
Definition: AsmPrinter.h:99
Value * getOperand(unsigned i) const
Definition: User.h:170
Instances of this class represent a single low-level machine instruction.
Definition: MCInst.h:161
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:220
static bool canBeHidden(const GlobalValue *GV, const MCAsmInfo &MAI)
Definition: AsmPrinter.cpp:375
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:463
StringRef getName() const
TargetInstrInfo - Interface to description of machine instruction set.
bool hasAppendingLinkage() const
Definition: GlobalValue.h:433
Windows Exception Handling.
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 useEmulatedTLS() const
Returns true if this target uses emulated TLS.
bool isOSWindows() const
Tests whether the OS is Windows.
Definition: Triple.h:566
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:428
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:841
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:742
unsigned getPreferredAlignmentLog(const GlobalVariable *GV) const
Returns the preferred alignment of the specified global, returned in log form.
Definition: DataLayout.cpp:848
#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:410
void EmitZeros(uint64_t NumBytes)
Emit NumBytes worth of zeros.
Definition: MCStreamer.cpp:189
Streaming machine code generation interface.
Definition: MCStreamer.h:183
virtual void EmitFunctionBodyEnd()
Targets can override this to emit stuff after the last basic block in the function.
Definition: AsmPrinter.h:389
static const char *const EHTimerDescription
Definition: AsmPrinter.cpp:135
StringRef getName() const
Definition: Comdat.cpp:27
MCSymbol * createTempSymbol(bool CanBeUnnamed=true)
Create and return a new assembler temporary symbol with a unique but unspecified name.
Definition: MCContext.cpp:217
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:233
MCSymbol * CurrentFnSym
The symbol for the current function.
Definition: AsmPrinter.h:112
bool getAsmPrinterFlag(CommentFlag Flag) const
Return whether an AsmPrinter flag is set.
Definition: MachineInstr.h:275
LLVM Basic Block Representation.
Definition: BasicBlock.h:59
const FunctionListType & getFunctionList() const
Get the Module&#39;s list of functions (constant).
Definition: Module.h:520
const MCAsmInfo * MAI
Target Asm Printer information.
Definition: AsmPrinter.h:84
The instances of the Type class are immutable: once they are created, they are never changed...
Definition: Type.h:46
const TargetSubtargetInfo & getSubtarget() const
getSubtarget - Return the subtarget for which this machine code is being compiled.
virtual bool shouldPutJumpTableInFunctionSection(bool UsesLabelDifference, const Function &F) const
void takeDeletedSymbolsForFunction(const Function *F, std::vector< MCSymbol *> &Result)
If the specified function has had any references to address-taken blocks generated, but the block got deleted, return the symbol now so we can emit it.
void getAnalysisUsage(AnalysisUsage &AU) const override
getAnalysisUsage - Subclasses that override getAnalysisUsage must call this.
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:597
AsmPrinter(TargetMachine &TM, std::unique_ptr< MCStreamer > Streamer)
Definition: AsmPrinter.cpp:184
Metadata * getModuleFlag(StringRef Key) const
Return the corresponding value if Key appears in module flags, otherwise return null.
Definition: Module.cpp:305
MachineFrameInfo & getFrameInfo()
getFrameInfo - Return the frame info object for the current function.
bool needsLocalForSize() const
Definition: MCAsmInfo.h:490
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:629
LLVM_ATTRIBUTE_ALWAYS_INLINE iterator begin()
Definition: SmallVector.h:129
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
MCSymbol * getSymbol(const GlobalValue *GV) const
void EmitAlignment(unsigned NumBits, const GlobalObject *GV=nullptr) const
Emit an alignment directive to the specified power of two boundary.
static const MCBinaryExpr * createOr(const MCExpr *LHS, const MCExpr *RHS, MCContext &Ctx)
Definition: MCExpr.h:525
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:81
This class is intended to be used as a driving class for all asm writers.
Definition: AsmPrinter.h:78
bool isCImm() const
isCImm - Test if this is a MO_CImmediate operand.
void getNameWithPrefix(SmallVectorImpl< char > &Name, const GlobalValue *GV) const
Definition: AsmPrinter.cpp:423
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:598
const DILabel * getDebugLabel() const
Return the debug label referenced by this DBG_LABEL instruction.
bool hasWeakDefCanBeHiddenDirective() const
Definition: MCAsmInfo.h:548
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:361
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:534
const Triple & getTargetTriple() const
bool useAssignmentForEHBegin() const
Definition: MCAsmInfo.h:489
op_range operands()
Definition: User.h:238
bool hasLinkerPrivateGlobalPrefix() const
Definition: DataLayout.h:272
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:190
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:410
void emitFrameAlloc(const MachineInstr &MI)
Definition: AsmPrinter.cpp:992
.weak_reference (MachO)
Definition: MCDirectives.h:44
bool isOSBinFormatMachO() const
Tests whether the environment is MachO.
Definition: Triple.h:602
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:134
bool hasWeakDefDirective() const
Definition: MCAsmInfo.h:546
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:539
Abstract base class for all machine specific constantpool value subclasses.
static void emitGlobalConstantVector(const DataLayout &DL, const ConstantVector *CV, AsmPrinter &AP)
size_t size() const
Definition: SmallVector.h:53
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:1063
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:456
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:4197
std::string & str()
Flushes the stream contents to the target string and returns the string&#39;s reference.
Definition: raw_ostream.h:499
#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:633
union llvm::MachineConstantPoolEntry::@150 Val
The constant itself.
unsigned getPointerSize(unsigned AS) const
Get the pointer size for this target.
iterator_range< expr_op_iterator > expr_ops() const
bool hasWeakLinkage() const
Definition: GlobalValue.h:430
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:387
unsigned getFunctionNumber() const
Return a unique ID for the current function.
Definition: AsmPrinter.cpp:206
const std::vector< LandingPadInfo > & getLandingPads() const
Return a reference to the landing pad info for the current function.
virtual bool hasLoadFromStackSlot(const MachineInstr &MI, SmallVectorImpl< const MachineMemOperand *> &Accesses) const
If the specified machine instruction has a load from a stack slot, return true along with the FrameIn...
unsigned getNumOperands() const
Definition: User.h:192
void emitCFIInstruction(const MachineInstr &MI)
Definition: AsmPrinter.cpp:967
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:812
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
unsigned Alignment
The required alignment for this entry.
This is the shared class of boolean and integer constants.
Definition: Constants.h:84
static iterator begin()
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:122
mmo_iterator memoperands_begin() const
Access to memory operands of the instruction.
Definition: MachineInstr.h:534
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:139
MCSymbol * getSymbol(const GlobalValue *GV) const
Definition: AsmPrinter.cpp:428
const MCSymbol & getSymbol() const
Definition: MCExpr.h:335
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:401
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:847
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:2628
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:700
unsigned EmitAddrsig
Emit address-significance table.
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:229
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:529
StringRef str()
Return a StringRef for the vector contents.
Definition: raw_ostream.h:535
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:200
void emitInt32(int Value) const
Emit a long directive and value.
MCSymbolAttr
Definition: MCDirectives.h:19
void print(raw_ostream &OS, bool isSigned) const
Definition: APInt.cpp:2135
int64_t getImm() const
MachineDominatorTree * MDT
This is a pointer to the current MachineLoopInfo.
Definition: AsmPrinter.h:102
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:573
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:539
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:70
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:472
virtual void EmitFunctionBodyStart()
Targets can override this to emit stuff before the first basic block in the function.
Definition: AsmPrinter.h:385
MCSymbol * getCurExceptionSym()
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.
void setPreservesAll()
Set by analyses that do not transform their input at all.
iterator_range< user_iterator > users()
Definition: Value.h:400
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:2729
iterator end() const
Definition: GCMetadata.h:197
const MachineBasicBlock * getParent() const
Definition: MachineInstr.h:254
MachineModuleInfoELF - This is a MachineModuleInfoImpl implementation for ELF targets.
TargetSubtargetInfo - Generic base class for all target subtargets.
static bool emitDebugLabelComment(const MachineInstr *MI, AsmPrinter &AP)
This method handles the target-independent form of DBG_LABEL, returning true if it was able to do so...
Definition: AsmPrinter.cpp:931
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:675
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:428
LoopT * getParentLoop() const
Definition: LoopInfo.h:101
MachineLoopInfo * MLI
This is a pointer to the current MachineLoopInfo.
Definition: AsmPrinter.h:105
Representation of each machine instruction.
Definition: MachineInstr.h:64
static const char *const CFGuardName
Definition: AsmPrinter.cpp:136
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:133
bool doInitialization(Module &M) override
Set up the AsmPrinter when we are working on a new module.
Definition: AsmPrinter.cpp:246
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.
virtual bool hasStoreToStackSlot(const MachineInstr &MI, SmallVectorImpl< const MachineMemOperand *> &Accesses) const
If the specified machine instruction has a store to a stack slot, return true along with the FrameInd...
bool isFunctionTy() const
True if this is an instance of FunctionType.
Definition: Type.h:215
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:543
SequentialType * getType() const
Specialize the getType() method to always return a SequentialType, which reduces the amount of castin...
Definition: Constants.h:629
APFloat getElementAsAPFloat(unsigned i) const
If this is a sequential container of floating point type, return the specified element as an APFloat...
Definition: Constants.cpp:2676
StringRef filename(StringRef path, Style style=Style::native)
Get filename.
Definition: Path.cpp:590
.type _foo,
Definition: MCDirectives.h:30
MCSymbol * getOrCreateSymbol(const Twine &Name)
Lookup the symbol inside with the specified Name.
Definition: MCContext.cpp:123
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:4094
bool isEHPad() const
Returns true if the block is a landing pad.
LLVM_NODISCARD bool empty() const
Definition: SmallVector.h:56
Represents a single loop in the control flow graph.
Definition: LoopInfo.h:459
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:97
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:742
virtual const TargetFrameLowering * getFrameLowering() const
bool isFI() const
isFI - Tests if this is a MO_FrameIndex operand.
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:152
static const MCBinaryExpr * createMod(const MCExpr *LHS, const MCExpr *RHS, MCContext &Ctx)
Definition: MCExpr.h:510
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:137
uint32_t Size
Definition: Profile.cpp:47
bool hasAltEntry() const
Definition: MCAsmInfo.h:543
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:161
virtual void EmitFunctionEntryLabel()
EmitFunctionEntryLabel - Emit the label that is the entrypoint for the function.
Definition: AsmPrinter.cpp:724
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:247
const GlobalObject * getBaseObject() const
Definition: Globals.cpp:261
bool isDeclaration() const
Return true if the primary definition of this global value is outside of the current translation unit...
Definition: Globals.cpp:206
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:396
DILocalScope * getScope() const
Get the local scope for this label.
assert(ImpDefSCC.getReg()==AMDGPU::SCC &&ImpDefSCC.isDef())
A raw_ostream that writes to an std::string.
Definition: raw_ostream.h:483
MCSectionELF * getELFSection(const Twine &Section, unsigned Type, unsigned Flags)
Definition: MCContext.h:389
virtual bool supportPrintSchedInfo() const
Support printing of [latency:throughput] comment in output .S file.
MCSymbol * getMCSymbol() const
void EmitGlobalConstant(const DataLayout &DL, const Constant *CV)
Print a general LLVM constant to the .s file.
void emitInt8(int Value) const
Emit a byte directive and value.
Module * getParent()
Get the module that this global value is contained inside of...
Definition: GlobalValue.h:566
LLVM Value Representation.
Definition: Value.h:73
Constant * getPersonalityFn() const
Get the personality function associated with this function.
Definition: Function.cpp:1302
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:411
bool isThreadLocal() const
Definition: SectionKind.h:149
bool hasInitializer() const
Definitions have initializers, declarations don&#39;t.
MachineLoop * getLoopFor(const MachineBasicBlock *BB) const
Return the innermost loop that BB lives in.
ExceptionHandling
Windows CE ARM, PowerPC, SH3, SH4.
static const char *const DbgTimerName
Definition: AsmPrinter.cpp:132
const DILocalVariable * getDebugVariable() const
Return the debug variable referenced by this DBG_VALUE instruction.
ExceptionHandling getExceptionHandlingType() const
Definition: MCAsmInfo.h:570
Attribute getFnAttribute(Attribute::AttrKind Kind) const
Return the attribute for the given attribute kind.
Definition: Function.h:331
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:46
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:438
MCSymbol * CurrentFnSymForSize
The symbol used to represent the start of the current function for the purpose of calculating its siz...
Definition: AsmPrinter.h:117
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:112
const DataLayout & getDataLayout() const
Return information about data layout.
Definition: AsmPrinter.cpp:214
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:247
virtual MCSection * getSectionForJumpTable(const Function &F, const TargetMachine &TM) const
iterator_range< global_iterator > globals()
Definition: Module.h:574
IRTranslator LLVM IR MI
MachineOptimizationRemarkEmitter * ORE
Optimization remark emitter.
Definition: AsmPrinter.h:108
bool hasOneUse() const
Return true if there is exactly one user of this value.
Definition: Value.h:413
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:49
A single uniqued string.
Definition: Metadata.h:604
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:280
unsigned getNumElements() const
Return the number of elements in the array or vector.
Definition: Constants.cpp:2392
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: Pass.h:357
bool isBigEndian() const
Definition: DataLayout.h:222
const MCSection * getCurrentSection() const
Return the current section we are emitting to.
Definition: AsmPrinter.cpp:234
unsigned getOpcode() const
Definition: MCInst.h:174
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:1075
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:414
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:556
DomTreeBase< MachineBasicBlock > & getBase()
static SectionKind getReadOnly()
Definition: SectionKind.h:182
MCSymbol * createTempSymbol(const Twine &Name) const
MCSymbolAttr getProtectedVisibilityAttr() const
Definition: MCAsmInfo.h:560
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:895
void emitStackSizeSection(const MachineFunction &MF)
bool use_empty() const
Definition: Value.h:323
#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:164
Type * getElementType() const
Definition: DerivedTypes.h:486
PointerType * getType() const
Global values are always pointers.
Definition: GlobalValue.h:274
.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:386
void emitInt16(int Value) const
Emit a short directive and value.
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:2717
MCSubtargetInfo & getSubtargetCopy(const MCSubtargetInfo &STI)
Definition: MCContext.cpp:534