LLVM  6.0.0svn
AsmPrinter.cpp
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1 //===- AsmPrinter.cpp - Common AsmPrinter code ----------------------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file implements the AsmPrinter class.
11 //
12 //===----------------------------------------------------------------------===//
13 
15 #include "AsmPrinterHandler.h"
16 #include "CodeViewDebug.h"
17 #include "DwarfDebug.h"
18 #include "DwarfException.h"
19 #include "WinException.h"
20 #include "llvm/ADT/APFloat.h"
21 #include "llvm/ADT/APInt.h"
22 #include "llvm/ADT/DenseMap.h"
23 #include "llvm/ADT/STLExtras.h"
24 #include "llvm/ADT/SmallPtrSet.h"
25 #include "llvm/ADT/SmallString.h"
26 #include "llvm/ADT/SmallVector.h"
27 #include "llvm/ADT/Statistic.h"
28 #include "llvm/ADT/StringRef.h"
29 #include "llvm/ADT/Triple.h"
30 #include "llvm/ADT/Twine.h"
36 #include "llvm/BinaryFormat/ELF.h"
61 #include "llvm/IR/BasicBlock.h"
62 #include "llvm/IR/Comdat.h"
63 #include "llvm/IR/Constant.h"
64 #include "llvm/IR/Constants.h"
65 #include "llvm/IR/DataLayout.h"
67 #include "llvm/IR/DerivedTypes.h"
68 #include "llvm/IR/Function.h"
69 #include "llvm/IR/GlobalAlias.h"
70 #include "llvm/IR/GlobalIFunc.h"
72 #include "llvm/IR/GlobalObject.h"
73 #include "llvm/IR/GlobalValue.h"
74 #include "llvm/IR/GlobalVariable.h"
75 #include "llvm/IR/Instruction.h"
76 #include "llvm/IR/Mangler.h"
77 #include "llvm/IR/Metadata.h"
78 #include "llvm/IR/Module.h"
79 #include "llvm/IR/Operator.h"
80 #include "llvm/IR/Type.h"
81 #include "llvm/IR/Value.h"
82 #include "llvm/MC/MCAsmInfo.h"
83 #include "llvm/MC/MCCodePadder.h"
84 #include "llvm/MC/MCContext.h"
85 #include "llvm/MC/MCDirectives.h"
86 #include "llvm/MC/MCDwarf.h"
87 #include "llvm/MC/MCExpr.h"
88 #include "llvm/MC/MCInst.h"
89 #include "llvm/MC/MCSection.h"
90 #include "llvm/MC/MCSectionELF.h"
91 #include "llvm/MC/MCSectionMachO.h"
92 #include "llvm/MC/MCStreamer.h"
94 #include "llvm/MC/MCSymbol.h"
95 #include "llvm/MC/MCSymbolELF.h"
97 #include "llvm/MC/MCValue.h"
98 #include "llvm/MC/SectionKind.h"
99 #include "llvm/Pass.h"
100 #include "llvm/Support/Casting.h"
102 #include "llvm/Support/Compiler.h"
104 #include "llvm/Support/Format.h"
105 #include "llvm/Support/MathExtras.h"
106 #include "llvm/Support/Path.h"
108 #include "llvm/Support/Timer.h"
112 #include <algorithm>
113 #include <cassert>
114 #include <cinttypes>
115 #include <cstdint>
116 #include <iterator>
117 #include <limits>
118 #include <memory>
119 #include <string>
120 #include <utility>
121 #include <vector>
122 
123 using namespace llvm;
124 
125 #define DEBUG_TYPE "asm-printer"
126 
127 static const char *const DWARFGroupName = "dwarf";
128 static const char *const DWARFGroupDescription = "DWARF Emission";
129 static const char *const DbgTimerName = "emit";
130 static const char *const DbgTimerDescription = "Debug Info Emission";
131 static const char *const EHTimerName = "write_exception";
132 static const char *const EHTimerDescription = "DWARF Exception Writer";
133 static const char *const CodeViewLineTablesGroupName = "linetables";
134 static const char *const CodeViewLineTablesGroupDescription =
135  "CodeView Line Tables";
136 
137 STATISTIC(EmittedInsts, "Number of machine instrs printed");
138 
139 static cl::opt<bool>
140  PrintSchedule("print-schedule", cl::Hidden, cl::init(false),
141  cl::desc("Print 'sched: [latency:throughput]' in .s output"));
142 
143 char AsmPrinter::ID = 0;
144 
146 
147 static gcp_map_type &getGCMap(void *&P) {
148  if (!P)
149  P = new gcp_map_type();
150  return *(gcp_map_type*)P;
151 }
152 
153 /// getGVAlignmentLog2 - Return the alignment to use for the specified global
154 /// value in log2 form. This rounds up to the preferred alignment if possible
155 /// and legal.
156 static unsigned getGVAlignmentLog2(const GlobalValue *GV, const DataLayout &DL,
157  unsigned InBits = 0) {
158  unsigned NumBits = 0;
159  if (const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV))
160  NumBits = DL.getPreferredAlignmentLog(GVar);
161 
162  // If InBits is specified, round it to it.
163  if (InBits > NumBits)
164  NumBits = InBits;
165 
166  // If the GV has a specified alignment, take it into account.
167  if (GV->getAlignment() == 0)
168  return NumBits;
169 
170  unsigned GVAlign = Log2_32(GV->getAlignment());
171 
172  // If the GVAlign is larger than NumBits, or if we are required to obey
173  // NumBits because the GV has an assigned section, obey it.
174  if (GVAlign > NumBits || GV->hasSection())
175  NumBits = GVAlign;
176  return NumBits;
177 }
178 
179 AsmPrinter::AsmPrinter(TargetMachine &tm, std::unique_ptr<MCStreamer> Streamer)
180  : MachineFunctionPass(ID), TM(tm), MAI(tm.getMCAsmInfo()),
181  OutContext(Streamer->getContext()), OutStreamer(std::move(Streamer)) {
182  VerboseAsm = OutStreamer->isVerboseAsm();
183 }
184 
186  assert(!DD && Handlers.empty() && "Debug/EH info didn't get finalized");
187 
188  if (GCMetadataPrinters) {
189  gcp_map_type &GCMap = getGCMap(GCMetadataPrinters);
190 
191  delete &GCMap;
192  GCMetadataPrinters = nullptr;
193  }
194 }
195 
197  return TM.isPositionIndependent();
198 }
199 
200 /// getFunctionNumber - Return a unique ID for the current function.
202  return MF->getFunctionNumber();
203 }
204 
206  return *TM.getObjFileLowering();
207 }
208 
210  return MMI->getModule()->getDataLayout();
211 }
212 
213 // Do not use the cached DataLayout because some client use it without a Module
214 // (llvm-dsymutil, llvm-dwarfdump).
215 unsigned AsmPrinter::getPointerSize() const { return TM.getPointerSize(); }
216 
218  assert(MF && "getSubtargetInfo requires a valid MachineFunction!");
219  return MF->getSubtarget<MCSubtargetInfo>();
220 }
221 
224 }
225 
226 /// getCurrentSection() - Return the current section we are emitting to.
228  return OutStreamer->getCurrentSectionOnly();
229 }
230 
232  AU.setPreservesAll();
238 }
239 
241  MMI = getAnalysisIfAvailable<MachineModuleInfo>();
242 
243  // Initialize TargetLoweringObjectFile.
245  .Initialize(OutContext, TM);
246 
247  OutStreamer->InitSections(false);
248 
249  // Emit the version-min deplyment target directive if needed.
250  //
251  // FIXME: If we end up with a collection of these sorts of Darwin-specific
252  // or ELF-specific things, it may make sense to have a platform helper class
253  // that will work with the target helper class. For now keep it here, as the
254  // alternative is duplicated code in each of the target asm printers that
255  // use the directive, where it would need the same conditionalization
256  // anyway.
257  const Triple &TT = TM.getTargetTriple();
258  // If there is a version specified, Major will be non-zero.
259  if (TT.isOSDarwin() && TT.getOSMajorVersion() != 0) {
260  unsigned Major, Minor, Update;
261  MCVersionMinType VersionType;
262  if (TT.isWatchOS()) {
263  VersionType = MCVM_WatchOSVersionMin;
264  TT.getWatchOSVersion(Major, Minor, Update);
265  } else if (TT.isTvOS()) {
266  VersionType = MCVM_TvOSVersionMin;
267  TT.getiOSVersion(Major, Minor, Update);
268  } else if (TT.isMacOSX()) {
269  VersionType = MCVM_OSXVersionMin;
270  if (!TT.getMacOSXVersion(Major, Minor, Update))
271  Major = 0;
272  } else {
273  VersionType = MCVM_IOSVersionMin;
274  TT.getiOSVersion(Major, Minor, Update);
275  }
276  if (Major != 0)
277  OutStreamer->EmitVersionMin(VersionType, Major, Minor, Update);
278  }
279 
280  // Allow the target to emit any magic that it wants at the start of the file.
282 
283  // Very minimal debug info. It is ignored if we emit actual debug info. If we
284  // don't, this at least helps the user find where a global came from.
286  // .file "foo.c"
287  OutStreamer->EmitFileDirective(
289  }
290 
291  GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
292  assert(MI && "AsmPrinter didn't require GCModuleInfo?");
293  for (auto &I : *MI)
294  if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I))
295  MP->beginAssembly(M, *MI, *this);
296 
297  // Emit module-level inline asm if it exists.
298  if (!M.getModuleInlineAsm().empty()) {
299  // We're at the module level. Construct MCSubtarget from the default CPU
300  // and target triple.
301  std::unique_ptr<MCSubtargetInfo> STI(TM.getTarget().createMCSubtargetInfo(
304  OutStreamer->AddComment("Start of file scope inline assembly");
305  OutStreamer->AddBlankLine();
306  EmitInlineAsm(M.getModuleInlineAsm()+"\n",
308  OutStreamer->AddComment("End of file scope inline assembly");
309  OutStreamer->AddBlankLine();
310  }
311 
313  bool EmitCodeView = MMI->getModule()->getCodeViewFlag();
314  if (EmitCodeView && (TM.getTargetTriple().isKnownWindowsMSVCEnvironment() ||
316  Handlers.push_back(HandlerInfo(new CodeViewDebug(this),
317  DbgTimerName, DbgTimerDescription,
318  CodeViewLineTablesGroupName,
319  CodeViewLineTablesGroupDescription));
320  }
321  if (!EmitCodeView || MMI->getModule()->getDwarfVersion()) {
322  DD = new DwarfDebug(this, &M);
323  DD->beginModule();
324  Handlers.push_back(HandlerInfo(DD, DbgTimerName, DbgTimerDescription,
325  DWARFGroupName, DWARFGroupDescription));
326  }
327  }
328 
329  switch (MAI->getExceptionHandlingType()) {
333  isCFIMoveForDebugging = true;
335  break;
336  for (auto &F: M.getFunctionList()) {
337  // If the module contains any function with unwind data,
338  // .eh_frame has to be emitted.
339  // Ignore functions that won't get emitted.
340  if (!F.isDeclarationForLinker() && F.needsUnwindTableEntry()) {
341  isCFIMoveForDebugging = false;
342  break;
343  }
344  }
345  break;
346  default:
347  isCFIMoveForDebugging = false;
348  break;
349  }
350 
351  EHStreamer *ES = nullptr;
352  switch (MAI->getExceptionHandlingType()) {
354  break;
357  ES = new DwarfCFIException(this);
358  break;
360  ES = new ARMException(this);
361  break;
363  switch (MAI->getWinEHEncodingType()) {
364  default: llvm_unreachable("unsupported unwinding information encoding");
366  break;
369  ES = new WinException(this);
370  break;
371  }
372  break;
373  }
374  if (ES)
375  Handlers.push_back(HandlerInfo(ES, EHTimerName, EHTimerDescription,
376  DWARFGroupName, DWARFGroupDescription));
377  return false;
378 }
379 
380 static bool canBeHidden(const GlobalValue *GV, const MCAsmInfo &MAI) {
382  return false;
383 
384  return canBeOmittedFromSymbolTable(GV);
385 }
386 
387 void AsmPrinter::EmitLinkage(const GlobalValue *GV, MCSymbol *GVSym) const {
388  GlobalValue::LinkageTypes Linkage = GV->getLinkage();
389  switch (Linkage) {
395  if (MAI->hasWeakDefDirective()) {
396  // .globl _foo
397  OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Global);
398 
399  if (!canBeHidden(GV, *MAI))
400  // .weak_definition _foo
401  OutStreamer->EmitSymbolAttribute(GVSym, MCSA_WeakDefinition);
402  else
403  OutStreamer->EmitSymbolAttribute(GVSym, MCSA_WeakDefAutoPrivate);
404  } else if (MAI->hasLinkOnceDirective()) {
405  // .globl _foo
406  OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Global);
407  //NOTE: linkonce is handled by the section the symbol was assigned to.
408  } else {
409  // .weak _foo
410  OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Weak);
411  }
412  return;
414  // If external, declare as a global symbol: .globl _foo
415  OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Global);
416  return;
419  return;
423  llvm_unreachable("Should never emit this");
424  }
425  llvm_unreachable("Unknown linkage type!");
426 }
427 
429  const GlobalValue *GV) const {
430  TM.getNameWithPrefix(Name, GV, getObjFileLowering().getMangler());
431 }
432 
434  return TM.getSymbol(GV);
435 }
436 
437 /// EmitGlobalVariable - Emit the specified global variable to the .s file.
439  bool IsEmuTLSVar = TM.Options.EmulatedTLS && GV->isThreadLocal();
440  assert(!(IsEmuTLSVar && GV->hasCommonLinkage()) &&
441  "No emulated TLS variables in the common section");
442 
443  // Never emit TLS variable xyz in emulated TLS model.
444  // The initialization value is in __emutls_t.xyz instead of xyz.
445  if (IsEmuTLSVar)
446  return;
447 
448  if (GV->hasInitializer()) {
449  // Check to see if this is a special global used by LLVM, if so, emit it.
450  if (EmitSpecialLLVMGlobal(GV))
451  return;
452 
453  // Skip the emission of global equivalents. The symbol can be emitted later
454  // on by emitGlobalGOTEquivs in case it turns out to be needed.
455  if (GlobalGOTEquivs.count(getSymbol(GV)))
456  return;
457 
458  if (isVerbose()) {
459  // When printing the control variable __emutls_v.*,
460  // we don't need to print the original TLS variable name.
461  GV->printAsOperand(OutStreamer->GetCommentOS(),
462  /*PrintType=*/false, GV->getParent());
463  OutStreamer->GetCommentOS() << '\n';
464  }
465  }
466 
467  MCSymbol *GVSym = getSymbol(GV);
468  MCSymbol *EmittedSym = GVSym;
469 
470  // getOrCreateEmuTLSControlSym only creates the symbol with name and default
471  // attributes.
472  // GV's or GVSym's attributes will be used for the EmittedSym.
473  EmitVisibility(EmittedSym, GV->getVisibility(), !GV->isDeclaration());
474 
475  if (!GV->hasInitializer()) // External globals require no extra code.
476  return;
477 
478  GVSym->redefineIfPossible();
479  if (GVSym->isDefined() || GVSym->isVariable())
480  report_fatal_error("symbol '" + Twine(GVSym->getName()) +
481  "' is already defined");
482 
484  OutStreamer->EmitSymbolAttribute(EmittedSym, MCSA_ELF_TypeObject);
485 
487 
488  const DataLayout &DL = GV->getParent()->getDataLayout();
489  uint64_t Size = DL.getTypeAllocSize(GV->getType()->getElementType());
490 
491  // If the alignment is specified, we *must* obey it. Overaligning a global
492  // with a specified alignment is a prompt way to break globals emitted to
493  // sections and expected to be contiguous (e.g. ObjC metadata).
494  unsigned AlignLog = getGVAlignmentLog2(GV, DL);
495 
496  for (const HandlerInfo &HI : Handlers) {
497  NamedRegionTimer T(HI.TimerName, HI.TimerDescription,
498  HI.TimerGroupName, HI.TimerGroupDescription,
500  HI.Handler->setSymbolSize(GVSym, Size);
501  }
502 
503  // Handle common symbols
504  if (GVKind.isCommon()) {
505  if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
506  unsigned Align = 1 << AlignLog;
508  Align = 0;
509 
510  // .comm _foo, 42, 4
511  OutStreamer->EmitCommonSymbol(GVSym, Size, Align);
512  return;
513  }
514 
515  // Determine to which section this global should be emitted.
516  MCSection *TheSection = getObjFileLowering().SectionForGlobal(GV, GVKind, TM);
517 
518  // If we have a bss global going to a section that supports the
519  // zerofill directive, do so here.
520  if (GVKind.isBSS() && MAI->hasMachoZeroFillDirective() &&
521  TheSection->isVirtualSection()) {
522  if (Size == 0)
523  Size = 1; // zerofill of 0 bytes is undefined.
524  unsigned Align = 1 << AlignLog;
525  EmitLinkage(GV, GVSym);
526  // .zerofill __DATA, __bss, _foo, 400, 5
527  OutStreamer->EmitZerofill(TheSection, GVSym, Size, Align);
528  return;
529  }
530 
531  // If this is a BSS local symbol and we are emitting in the BSS
532  // section use .lcomm/.comm directive.
533  if (GVKind.isBSSLocal() &&
534  getObjFileLowering().getBSSSection() == TheSection) {
535  if (Size == 0)
536  Size = 1; // .comm Foo, 0 is undefined, avoid it.
537  unsigned Align = 1 << AlignLog;
538 
539  // Use .lcomm only if it supports user-specified alignment.
540  // Otherwise, while it would still be correct to use .lcomm in some
541  // cases (e.g. when Align == 1), the external assembler might enfore
542  // some -unknown- default alignment behavior, which could cause
543  // spurious differences between external and integrated assembler.
544  // Prefer to simply fall back to .local / .comm in this case.
546  // .lcomm _foo, 42
547  OutStreamer->EmitLocalCommonSymbol(GVSym, Size, Align);
548  return;
549  }
550 
551  if (!getObjFileLowering().getCommDirectiveSupportsAlignment())
552  Align = 0;
553 
554  // .local _foo
555  OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Local);
556  // .comm _foo, 42, 4
557  OutStreamer->EmitCommonSymbol(GVSym, Size, Align);
558  return;
559  }
560 
561  // Handle thread local data for mach-o which requires us to output an
562  // additional structure of data and mangle the original symbol so that we
563  // can reference it later.
564  //
565  // TODO: This should become an "emit thread local global" method on TLOF.
566  // All of this macho specific stuff should be sunk down into TLOFMachO and
567  // stuff like "TLSExtraDataSection" should no longer be part of the parent
568  // TLOF class. This will also make it more obvious that stuff like
569  // MCStreamer::EmitTBSSSymbol is macho specific and only called from macho
570  // specific code.
571  if (GVKind.isThreadLocal() && MAI->hasMachoTBSSDirective()) {
572  // Emit the .tbss symbol
573  MCSymbol *MangSym =
574  OutContext.getOrCreateSymbol(GVSym->getName() + Twine("$tlv$init"));
575 
576  if (GVKind.isThreadBSS()) {
577  TheSection = getObjFileLowering().getTLSBSSSection();
578  OutStreamer->EmitTBSSSymbol(TheSection, MangSym, Size, 1 << AlignLog);
579  } else if (GVKind.isThreadData()) {
580  OutStreamer->SwitchSection(TheSection);
581 
582  EmitAlignment(AlignLog, GV);
583  OutStreamer->EmitLabel(MangSym);
584 
586  GV->getInitializer());
587  }
588 
589  OutStreamer->AddBlankLine();
590 
591  // Emit the variable struct for the runtime.
593 
594  OutStreamer->SwitchSection(TLVSect);
595  // Emit the linkage here.
596  EmitLinkage(GV, GVSym);
597  OutStreamer->EmitLabel(GVSym);
598 
599  // Three pointers in size:
600  // - __tlv_bootstrap - used to make sure support exists
601  // - spare pointer, used when mapped by the runtime
602  // - pointer to mangled symbol above with initializer
603  unsigned PtrSize = DL.getPointerTypeSize(GV->getType());
604  OutStreamer->EmitSymbolValue(GetExternalSymbolSymbol("_tlv_bootstrap"),
605  PtrSize);
606  OutStreamer->EmitIntValue(0, PtrSize);
607  OutStreamer->EmitSymbolValue(MangSym, PtrSize);
608 
609  OutStreamer->AddBlankLine();
610  return;
611  }
612 
613  MCSymbol *EmittedInitSym = GVSym;
614 
615  OutStreamer->SwitchSection(TheSection);
616 
617  EmitLinkage(GV, EmittedInitSym);
618  EmitAlignment(AlignLog, GV);
619 
620  OutStreamer->EmitLabel(EmittedInitSym);
621 
623 
625  // .size foo, 42
626  OutStreamer->emitELFSize(EmittedInitSym,
628 
629  OutStreamer->AddBlankLine();
630 }
631 
632 /// Emit the directive and value for debug thread local expression
633 ///
634 /// \p Value - The value to emit.
635 /// \p Size - The size of the integer (in bytes) to emit.
637  unsigned Size) const {
638  OutStreamer->EmitValue(Value, Size);
639 }
640 
641 /// EmitFunctionHeader - This method emits the header for the current
642 /// function.
643 void AsmPrinter::EmitFunctionHeader() {
644  const Function *F = MF->getFunction();
645 
646  if (isVerbose())
647  OutStreamer->GetCommentOS()
648  << "-- Begin function "
650 
651  // Print out constants referenced by the function
653 
654  // Print the 'header' of function.
655  OutStreamer->SwitchSection(getObjFileLowering().SectionForGlobal(F, TM));
656  EmitVisibility(CurrentFnSym, F->getVisibility());
657 
658  EmitLinkage(F, CurrentFnSym);
659  if (MAI->hasFunctionAlignment())
661 
663  OutStreamer->EmitSymbolAttribute(CurrentFnSym, MCSA_ELF_TypeFunction);
664 
665  if (isVerbose()) {
666  F->printAsOperand(OutStreamer->GetCommentOS(),
667  /*PrintType=*/false, F->getParent());
668  OutStreamer->GetCommentOS() << '\n';
669  }
670 
671  // Emit the prefix data.
672  if (F->hasPrefixData()) {
673  if (MAI->hasSubsectionsViaSymbols()) {
674  // Preserving prefix data on platforms which use subsections-via-symbols
675  // is a bit tricky. Here we introduce a symbol for the prefix data
676  // and use the .alt_entry attribute to mark the function's real entry point
677  // as an alternative entry point to the prefix-data symbol.
679  OutStreamer->EmitLabel(PrefixSym);
680 
682 
683  // Emit an .alt_entry directive for the actual function symbol.
684  OutStreamer->EmitSymbolAttribute(CurrentFnSym, MCSA_AltEntry);
685  } else {
687  }
688  }
689 
690  // Emit the CurrentFnSym. This is a virtual function to allow targets to
691  // do their wild and crazy things as required.
693 
694  // If the function had address-taken blocks that got deleted, then we have
695  // references to the dangling symbols. Emit them at the start of the function
696  // so that we don't get references to undefined symbols.
697  std::vector<MCSymbol*> DeadBlockSyms;
698  MMI->takeDeletedSymbolsForFunction(F, DeadBlockSyms);
699  for (unsigned i = 0, e = DeadBlockSyms.size(); i != e; ++i) {
700  OutStreamer->AddComment("Address taken block that was later removed");
701  OutStreamer->EmitLabel(DeadBlockSyms[i]);
702  }
703 
704  if (CurrentFnBegin) {
705  if (MAI->useAssignmentForEHBegin()) {
707  OutStreamer->EmitLabel(CurPos);
708  OutStreamer->EmitAssignment(CurrentFnBegin,
710  } else {
711  OutStreamer->EmitLabel(CurrentFnBegin);
712  }
713  }
714 
715  // Emit pre-function debug and/or EH information.
716  for (const HandlerInfo &HI : Handlers) {
717  NamedRegionTimer T(HI.TimerName, HI.TimerDescription, HI.TimerGroupName,
718  HI.TimerGroupDescription, TimePassesIsEnabled);
719  HI.Handler->beginFunction(MF);
720  }
721 
722  // Emit the prologue data.
723  if (F->hasPrologueData())
725 }
726 
727 /// EmitFunctionEntryLabel - Emit the label that is the entrypoint for the
728 /// function. This can be overridden by targets as required to do custom stuff.
731 
732  // The function label could have already been emitted if two symbols end up
733  // conflicting due to asm renaming. Detect this and emit an error.
734  if (CurrentFnSym->isVariable())
736  "' is a protected alias");
737  if (CurrentFnSym->isDefined())
739  "' label emitted multiple times to assembly file");
740 
741  return OutStreamer->EmitLabel(CurrentFnSym);
742 }
743 
744 /// emitComments - Pretty-print comments for instructions.
745 static void emitComments(const MachineInstr &MI, raw_ostream &CommentOS,
746  AsmPrinter *AP) {
747  const MachineFunction *MF = MI.getMF();
748  const TargetInstrInfo *TII = MF->getSubtarget().getInstrInfo();
749 
750  // Check for spills and reloads
751  int FI;
752 
753  const MachineFrameInfo &MFI = MF->getFrameInfo();
754  bool Commented = false;
755 
756  // We assume a single instruction only has a spill or reload, not
757  // both.
758  const MachineMemOperand *MMO;
759  if (TII->isLoadFromStackSlotPostFE(MI, FI)) {
760  if (MFI.isSpillSlotObjectIndex(FI)) {
761  MMO = *MI.memoperands_begin();
762  CommentOS << MMO->getSize() << "-byte Reload";
763  Commented = true;
764  }
765  } else if (TII->hasLoadFromStackSlot(MI, MMO, FI)) {
766  if (MFI.isSpillSlotObjectIndex(FI)) {
767  CommentOS << MMO->getSize() << "-byte Folded Reload";
768  Commented = true;
769  }
770  } else if (TII->isStoreToStackSlotPostFE(MI, FI)) {
771  if (MFI.isSpillSlotObjectIndex(FI)) {
772  MMO = *MI.memoperands_begin();
773  CommentOS << MMO->getSize() << "-byte Spill";
774  Commented = true;
775  }
776  } else if (TII->hasStoreToStackSlot(MI, MMO, FI)) {
777  if (MFI.isSpillSlotObjectIndex(FI)) {
778  CommentOS << MMO->getSize() << "-byte Folded Spill";
779  Commented = true;
780  }
781  }
782 
783  // Check for spill-induced copies
785  Commented = true;
786  CommentOS << " Reload Reuse";
787  }
788 
789  if (Commented && AP->EnablePrintSchedInfo)
790  // If any comment was added above and we need sched info comment then
791  // add this new comment just after the above comment w/o "\n" between them.
792  CommentOS << " " << MF->getSubtarget().getSchedInfoStr(MI) << "\n";
793  else if (Commented)
794  CommentOS << "\n";
795 }
796 
797 /// emitImplicitDef - This method emits the specified machine instruction
798 /// that is an implicit def.
800  unsigned RegNo = MI->getOperand(0).getReg();
801 
802  SmallString<128> Str;
803  raw_svector_ostream OS(Str);
804  OS << "implicit-def: "
805  << PrintReg(RegNo, MF->getSubtarget().getRegisterInfo());
806 
807  OutStreamer->AddComment(OS.str());
808  OutStreamer->AddBlankLine();
809 }
810 
811 static void emitKill(const MachineInstr *MI, AsmPrinter &AP) {
812  std::string Str;
813  raw_string_ostream OS(Str);
814  OS << "kill:";
815  for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
816  const MachineOperand &Op = MI->getOperand(i);
817  assert(Op.isReg() && "KILL instruction must have only register operands");
818  OS << ' '
819  << PrintReg(Op.getReg(),
821  << (Op.isDef() ? "<def>" : "<kill>");
822  }
823  AP.OutStreamer->AddComment(OS.str());
824  AP.OutStreamer->AddBlankLine();
825 }
826 
827 /// emitDebugValueComment - This method handles the target-independent form
828 /// of DBG_VALUE, returning true if it was able to do so. A false return
829 /// means the target will need to handle MI in EmitInstruction.
831  // This code handles only the 4-operand target-independent form.
832  if (MI->getNumOperands() != 4)
833  return false;
834 
835  SmallString<128> Str;
836  raw_svector_ostream OS(Str);
837  OS << "DEBUG_VALUE: ";
838 
839  const DILocalVariable *V = MI->getDebugVariable();
840  if (auto *SP = dyn_cast<DISubprogram>(V->getScope())) {
841  StringRef Name = SP->getName();
842  if (!Name.empty())
843  OS << Name << ":";
844  }
845  OS << V->getName();
846  OS << " <- ";
847 
848  // The second operand is only an offset if it's an immediate.
849  bool MemLoc = MI->getOperand(0).isReg() && MI->getOperand(1).isImm();
850  int64_t Offset = MemLoc ? MI->getOperand(1).getImm() : 0;
851  const DIExpression *Expr = MI->getDebugExpression();
852  if (Expr->getNumElements()) {
853  OS << '[';
854  bool NeedSep = false;
855  for (auto Op : Expr->expr_ops()) {
856  if (NeedSep)
857  OS << ", ";
858  else
859  NeedSep = true;
860  OS << dwarf::OperationEncodingString(Op.getOp());
861  for (unsigned I = 0; I < Op.getNumArgs(); ++I)
862  OS << ' ' << Op.getArg(I);
863  }
864  OS << "] ";
865  }
866 
867  // Register or immediate value. Register 0 means undef.
868  if (MI->getOperand(0).isFPImm()) {
869  APFloat APF = APFloat(MI->getOperand(0).getFPImm()->getValueAPF());
870  if (MI->getOperand(0).getFPImm()->getType()->isFloatTy()) {
871  OS << (double)APF.convertToFloat();
872  } else if (MI->getOperand(0).getFPImm()->getType()->isDoubleTy()) {
873  OS << APF.convertToDouble();
874  } else {
875  // There is no good way to print long double. Convert a copy to
876  // double. Ah well, it's only a comment.
877  bool ignored;
879  &ignored);
880  OS << "(long double) " << APF.convertToDouble();
881  }
882  } else if (MI->getOperand(0).isImm()) {
883  OS << MI->getOperand(0).getImm();
884  } else if (MI->getOperand(0).isCImm()) {
885  MI->getOperand(0).getCImm()->getValue().print(OS, false /*isSigned*/);
886  } else {
887  unsigned Reg;
888  if (MI->getOperand(0).isReg()) {
889  Reg = MI->getOperand(0).getReg();
890  } else {
891  assert(MI->getOperand(0).isFI() && "Unknown operand type");
893  Offset += TFI->getFrameIndexReference(*AP.MF,
894  MI->getOperand(0).getIndex(), Reg);
895  MemLoc = true;
896  }
897  if (Reg == 0) {
898  // Suppress offset, it is not meaningful here.
899  OS << "undef";
900  // NOTE: Want this comment at start of line, don't emit with AddComment.
901  AP.OutStreamer->emitRawComment(OS.str());
902  return true;
903  }
904  if (MemLoc)
905  OS << '[';
906  OS << PrintReg(Reg, AP.MF->getSubtarget().getRegisterInfo());
907  }
908 
909  if (MemLoc)
910  OS << '+' << Offset << ']';
911 
912  // NOTE: Want this comment at start of line, don't emit with AddComment.
913  AP.OutStreamer->emitRawComment(OS.str());
914  return true;
915 }
916 
920  return CFI_M_EH;
921 
922  if (MMI->hasDebugInfo())
923  return CFI_M_Debug;
924 
925  return CFI_M_None;
926 }
927 
930 }
931 
933  ExceptionHandling ExceptionHandlingType = MAI->getExceptionHandlingType();
934  if (ExceptionHandlingType != ExceptionHandling::DwarfCFI &&
935  ExceptionHandlingType != ExceptionHandling::ARM)
936  return;
937 
938  if (needsCFIMoves() == CFI_M_None)
939  return;
940 
941  // If there is no "real" instruction following this CFI instruction, skip
942  // emitting it; it would be beyond the end of the function's FDE range.
943  auto *MBB = MI.getParent();
944  auto I = std::next(MI.getIterator());
945  while (I != MBB->end() && I->isTransient())
946  ++I;
947  if (I == MBB->instr_end() &&
948  MBB->getReverseIterator() == MBB->getParent()->rbegin())
949  return;
950 
951  const std::vector<MCCFIInstruction> &Instrs = MF->getFrameInstructions();
952  unsigned CFIIndex = MI.getOperand(0).getCFIIndex();
953  const MCCFIInstruction &CFI = Instrs[CFIIndex];
954  emitCFIInstruction(CFI);
955 }
956 
958  // The operands are the MCSymbol and the frame offset of the allocation.
959  MCSymbol *FrameAllocSym = MI.getOperand(0).getMCSymbol();
960  int FrameOffset = MI.getOperand(1).getImm();
961 
962  // Emit a symbol assignment.
963  OutStreamer->EmitAssignment(FrameAllocSym,
964  MCConstantExpr::create(FrameOffset, OutContext));
965 }
966 
969  if (!MF.getLandingPads().empty() || MF.hasEHFunclets() || MMI->hasDebugInfo())
970  return true;
971 
972  // We might emit an EH table that uses function begin and end labels even if
973  // we don't have any landingpads.
974  if (!MF.getFunction()->hasPersonalityFn())
975  return false;
976  return !isNoOpWithoutInvoke(
978 }
979 
980 /// EmitFunctionBody - This method emits the body and trailer for a
981 /// function.
983  EmitFunctionHeader();
984 
985  // Emit target-specific gunk before the function body.
987 
988  bool ShouldPrintDebugScopes = MMI->hasDebugInfo();
989 
990  // Print out code for the function.
991  bool HasAnyRealCode = false;
992  int NumInstsInFunction = 0;
993  for (auto &MBB : *MF) {
994  // Print a label for the basic block.
995  EmitBasicBlockStart(MBB);
996  for (auto &MI : MBB) {
997  // Print the assembly for the instruction.
998  if (!MI.isPosition() && !MI.isImplicitDef() && !MI.isKill() &&
999  !MI.isDebugValue()) {
1000  HasAnyRealCode = true;
1001  ++NumInstsInFunction;
1002  }
1003 
1004  if (ShouldPrintDebugScopes) {
1005  for (const HandlerInfo &HI : Handlers) {
1006  NamedRegionTimer T(HI.TimerName, HI.TimerDescription,
1007  HI.TimerGroupName, HI.TimerGroupDescription,
1009  HI.Handler->beginInstruction(&MI);
1010  }
1011  }
1012 
1013  if (isVerbose())
1014  emitComments(MI, OutStreamer->GetCommentOS(), this);
1015 
1016  switch (MI.getOpcode()) {
1017  case TargetOpcode::CFI_INSTRUCTION:
1019  break;
1020  case TargetOpcode::LOCAL_ESCAPE:
1021  emitFrameAlloc(MI);
1022  break;
1024  case TargetOpcode::GC_LABEL:
1025  OutStreamer->EmitLabel(MI.getOperand(0).getMCSymbol());
1026  break;
1028  EmitInlineAsm(&MI);
1029  break;
1030  case TargetOpcode::DBG_VALUE:
1031  if (isVerbose()) {
1032  if (!emitDebugValueComment(&MI, *this))
1033  EmitInstruction(&MI);
1034  }
1035  break;
1036  case TargetOpcode::IMPLICIT_DEF:
1037  if (isVerbose()) emitImplicitDef(&MI);
1038  break;
1039  case TargetOpcode::KILL:
1040  if (isVerbose()) emitKill(&MI, *this);
1041  break;
1042  default:
1043  EmitInstruction(&MI);
1044  break;
1045  }
1046 
1047  if (ShouldPrintDebugScopes) {
1048  for (const HandlerInfo &HI : Handlers) {
1049  NamedRegionTimer T(HI.TimerName, HI.TimerDescription,
1050  HI.TimerGroupName, HI.TimerGroupDescription,
1052  HI.Handler->endInstruction();
1053  }
1054  }
1055  }
1056 
1057  EmitBasicBlockEnd(MBB);
1058  }
1059 
1060  EmittedInsts += NumInstsInFunction;
1061  MachineOptimizationRemarkAnalysis R(DEBUG_TYPE, "InstructionCount",
1062  MF->getFunction()->getSubprogram(),
1063  &MF->front());
1064  R << ore::NV("NumInstructions", NumInstsInFunction)
1065  << " instructions in function";
1066  ORE->emit(R);
1067 
1068  // If the function is empty and the object file uses .subsections_via_symbols,
1069  // then we need to emit *something* to the function body to prevent the
1070  // labels from collapsing together. Just emit a noop.
1071  // Similarly, don't emit empty functions on Windows either. It can lead to
1072  // duplicate entries (two functions with the same RVA) in the Guard CF Table
1073  // after linking, causing the kernel not to load the binary:
1074  // https://developercommunity.visualstudio.com/content/problem/45366/vc-linker-creates-invalid-dll-with-clang-cl.html
1075  // FIXME: Hide this behind some API in e.g. MCAsmInfo or MCTargetStreamer.
1076  const Triple &TT = TM.getTargetTriple();
1077  if (!HasAnyRealCode && (MAI->hasSubsectionsViaSymbols() ||
1078  (TT.isOSWindows() && TT.isOSBinFormatCOFF()))) {
1079  MCInst Noop;
1080  MF->getSubtarget().getInstrInfo()->getNoop(Noop);
1081 
1082  // Targets can opt-out of emitting the noop here by leaving the opcode
1083  // unspecified.
1084  if (Noop.getOpcode()) {
1085  OutStreamer->AddComment("avoids zero-length function");
1086  OutStreamer->EmitInstruction(Noop, getSubtargetInfo());
1087  }
1088  }
1089 
1090  const Function *F = MF->getFunction();
1091  for (const auto &BB : *F) {
1092  if (!BB.hasAddressTaken())
1093  continue;
1094  MCSymbol *Sym = GetBlockAddressSymbol(&BB);
1095  if (Sym->isDefined())
1096  continue;
1097  OutStreamer->AddComment("Address of block that was removed by CodeGen");
1098  OutStreamer->EmitLabel(Sym);
1099  }
1100 
1101  // Emit target-specific gunk after the function body.
1103 
1104  if (needFuncLabelsForEHOrDebugInfo(*MF, MMI) ||
1106  // Create a symbol for the end of function.
1107  CurrentFnEnd = createTempSymbol("func_end");
1108  OutStreamer->EmitLabel(CurrentFnEnd);
1109  }
1110 
1111  // If the target wants a .size directive for the size of the function, emit
1112  // it.
1114  // We can get the size as difference between the function label and the
1115  // temp label.
1116  const MCExpr *SizeExp = MCBinaryExpr::createSub(
1117  MCSymbolRefExpr::create(CurrentFnEnd, OutContext),
1119  OutStreamer->emitELFSize(CurrentFnSym, SizeExp);
1120  }
1121 
1122  for (const HandlerInfo &HI : Handlers) {
1123  NamedRegionTimer T(HI.TimerName, HI.TimerDescription, HI.TimerGroupName,
1124  HI.TimerGroupDescription, TimePassesIsEnabled);
1125  HI.Handler->markFunctionEnd();
1126  }
1127 
1128  // Print out jump tables referenced by the function.
1130 
1131  // Emit post-function debug and/or EH information.
1132  for (const HandlerInfo &HI : Handlers) {
1133  NamedRegionTimer T(HI.TimerName, HI.TimerDescription, HI.TimerGroupName,
1134  HI.TimerGroupDescription, TimePassesIsEnabled);
1135  HI.Handler->endFunction(MF);
1136  }
1137 
1138  if (isVerbose())
1139  OutStreamer->GetCommentOS() << "-- End function\n";
1140 
1141  OutStreamer->AddBlankLine();
1142 }
1143 
1144 /// \brief Compute the number of Global Variables that uses a Constant.
1145 static unsigned getNumGlobalVariableUses(const Constant *C) {
1146  if (!C)
1147  return 0;
1148 
1149  if (isa<GlobalVariable>(C))
1150  return 1;
1151 
1152  unsigned NumUses = 0;
1153  for (auto *CU : C->users())
1154  NumUses += getNumGlobalVariableUses(dyn_cast<Constant>(CU));
1155 
1156  return NumUses;
1157 }
1158 
1159 /// \brief Only consider global GOT equivalents if at least one user is a
1160 /// cstexpr inside an initializer of another global variables. Also, don't
1161 /// handle cstexpr inside instructions. During global variable emission,
1162 /// candidates are skipped and are emitted later in case at least one cstexpr
1163 /// isn't replaced by a PC relative GOT entry access.
1165  unsigned &NumGOTEquivUsers) {
1166  // Global GOT equivalents are unnamed private globals with a constant
1167  // pointer initializer to another global symbol. They must point to a
1168  // GlobalVariable or Function, i.e., as GlobalValue.
1169  if (!GV->hasGlobalUnnamedAddr() || !GV->hasInitializer() ||
1170  !GV->isConstant() || !GV->isDiscardableIfUnused() ||
1171  !dyn_cast<GlobalValue>(GV->getOperand(0)))
1172  return false;
1173 
1174  // To be a got equivalent, at least one of its users need to be a constant
1175  // expression used by another global variable.
1176  for (auto *U : GV->users())
1177  NumGOTEquivUsers += getNumGlobalVariableUses(dyn_cast<Constant>(U));
1178 
1179  return NumGOTEquivUsers > 0;
1180 }
1181 
1182 /// \brief Unnamed constant global variables solely contaning a pointer to
1183 /// another globals variable is equivalent to a GOT table entry; it contains the
1184 /// the address of another symbol. Optimize it and replace accesses to these
1185 /// "GOT equivalents" by using the GOT entry for the final global instead.
1186 /// Compute GOT equivalent candidates among all global variables to avoid
1187 /// emitting them if possible later on, after it use is replaced by a GOT entry
1188 /// access.
1190  if (!getObjFileLowering().supportIndirectSymViaGOTPCRel())
1191  return;
1192 
1193  for (const auto &G : M.globals()) {
1194  unsigned NumGOTEquivUsers = 0;
1195  if (!isGOTEquivalentCandidate(&G, NumGOTEquivUsers))
1196  continue;
1197 
1198  const MCSymbol *GOTEquivSym = getSymbol(&G);
1199  GlobalGOTEquivs[GOTEquivSym] = std::make_pair(&G, NumGOTEquivUsers);
1200  }
1201 }
1202 
1203 /// \brief Constant expressions using GOT equivalent globals may not be eligible
1204 /// for PC relative GOT entry conversion, in such cases we need to emit such
1205 /// globals we previously omitted in EmitGlobalVariable.
1207  if (!getObjFileLowering().supportIndirectSymViaGOTPCRel())
1208  return;
1209 
1210  SmallVector<const GlobalVariable *, 8> FailedCandidates;
1211  for (auto &I : GlobalGOTEquivs) {
1212  const GlobalVariable *GV = I.second.first;
1213  unsigned Cnt = I.second.second;
1214  if (Cnt)
1215  FailedCandidates.push_back(GV);
1216  }
1217  GlobalGOTEquivs.clear();
1218 
1219  for (auto *GV : FailedCandidates)
1220  EmitGlobalVariable(GV);
1221 }
1222 
1223 void AsmPrinter::emitGlobalIndirectSymbol(Module &M,
1224  const GlobalIndirectSymbol& GIS) {
1225  MCSymbol *Name = getSymbol(&GIS);
1226 
1227  if (GIS.hasExternalLinkage() || !MAI->getWeakRefDirective())
1228  OutStreamer->EmitSymbolAttribute(Name, MCSA_Global);
1229  else if (GIS.hasWeakLinkage() || GIS.hasLinkOnceLinkage())
1230  OutStreamer->EmitSymbolAttribute(Name, MCSA_WeakReference);
1231  else
1232  assert(GIS.hasLocalLinkage() && "Invalid alias or ifunc linkage");
1233 
1234  // Set the symbol type to function if the alias has a function type.
1235  // This affects codegen when the aliasee is not a function.
1236  if (GIS.getType()->getPointerElementType()->isFunctionTy()) {
1237  OutStreamer->EmitSymbolAttribute(Name, MCSA_ELF_TypeFunction);
1238  if (isa<GlobalIFunc>(GIS))
1239  OutStreamer->EmitSymbolAttribute(Name, MCSA_ELF_TypeIndFunction);
1240  }
1241 
1242  EmitVisibility(Name, GIS.getVisibility());
1243 
1244  const MCExpr *Expr = lowerConstant(GIS.getIndirectSymbol());
1245 
1246  if (isa<GlobalAlias>(&GIS) && MAI->hasAltEntry() && isa<MCBinaryExpr>(Expr))
1247  OutStreamer->EmitSymbolAttribute(Name, MCSA_AltEntry);
1248 
1249  // Emit the directives as assignments aka .set:
1250  OutStreamer->EmitAssignment(Name, Expr);
1251 
1252  if (auto *GA = dyn_cast<GlobalAlias>(&GIS)) {
1253  // If the aliasee does not correspond to a symbol in the output, i.e. the
1254  // alias is not of an object or the aliased object is private, then set the
1255  // size of the alias symbol from the type of the alias. We don't do this in
1256  // other situations as the alias and aliasee having differing types but same
1257  // size may be intentional.
1258  const GlobalObject *BaseObject = GA->getBaseObject();
1259  if (MAI->hasDotTypeDotSizeDirective() && GA->getValueType()->isSized() &&
1260  (!BaseObject || BaseObject->hasPrivateLinkage())) {
1261  const DataLayout &DL = M.getDataLayout();
1262  uint64_t Size = DL.getTypeAllocSize(GA->getValueType());
1263  OutStreamer->emitELFSize(Name, MCConstantExpr::create(Size, OutContext));
1264  }
1265  }
1266 }
1267 
1269  // Set the MachineFunction to nullptr so that we can catch attempted
1270  // accesses to MF specific features at the module level and so that
1271  // we can conditionalize accesses based on whether or not it is nullptr.
1272  MF = nullptr;
1273 
1274  // Gather all GOT equivalent globals in the module. We really need two
1275  // passes over the globals: one to compute and another to avoid its emission
1276  // in EmitGlobalVariable, otherwise we would not be able to handle cases
1277  // where the got equivalent shows up before its use.
1279 
1280  // Emit global variables.
1281  for (const auto &G : M.globals())
1283 
1284  // Emit remaining GOT equivalent globals.
1286 
1287  // Emit visibility info for declarations
1288  for (const Function &F : M) {
1289  if (!F.isDeclarationForLinker())
1290  continue;
1291  GlobalValue::VisibilityTypes V = F.getVisibility();
1293  continue;
1294 
1295  MCSymbol *Name = getSymbol(&F);
1296  EmitVisibility(Name, V, false);
1297  }
1298 
1300 
1301  TLOF.emitModuleMetadata(*OutStreamer, M, TM);
1302 
1305 
1306  // Output stubs for external and common global variables.
1308  if (!Stubs.empty()) {
1309  OutStreamer->SwitchSection(TLOF.getDataSection());
1310  const DataLayout &DL = M.getDataLayout();
1311 
1312  for (const auto &Stub : Stubs) {
1313  OutStreamer->EmitLabel(Stub.first);
1314  OutStreamer->EmitSymbolValue(Stub.second.getPointer(),
1315  DL.getPointerSize());
1316  }
1317  }
1318  }
1319 
1320  // Finalize debug and EH information.
1321  for (const HandlerInfo &HI : Handlers) {
1322  NamedRegionTimer T(HI.TimerName, HI.TimerDescription, HI.TimerGroupName,
1323  HI.TimerGroupDescription, TimePassesIsEnabled);
1324  HI.Handler->endModule();
1325  delete HI.Handler;
1326  }
1327  Handlers.clear();
1328  DD = nullptr;
1329 
1330  // If the target wants to know about weak references, print them all.
1331  if (MAI->getWeakRefDirective()) {
1332  // FIXME: This is not lazy, it would be nice to only print weak references
1333  // to stuff that is actually used. Note that doing so would require targets
1334  // to notice uses in operands (due to constant exprs etc). This should
1335  // happen with the MC stuff eventually.
1336 
1337  // Print out module-level global objects here.
1338  for (const auto &GO : M.global_objects()) {
1339  if (!GO.hasExternalWeakLinkage())
1340  continue;
1341  OutStreamer->EmitSymbolAttribute(getSymbol(&GO), MCSA_WeakReference);
1342  }
1343  }
1344 
1345  OutStreamer->AddBlankLine();
1346 
1347  // Print aliases in topological order, that is, for each alias a = b,
1348  // b must be printed before a.
1349  // This is because on some targets (e.g. PowerPC) linker expects aliases in
1350  // such an order to generate correct TOC information.
1353  for (const auto &Alias : M.aliases()) {
1354  for (const GlobalAlias *Cur = &Alias; Cur;
1355  Cur = dyn_cast<GlobalAlias>(Cur->getAliasee())) {
1356  if (!AliasVisited.insert(Cur).second)
1357  break;
1358  AliasStack.push_back(Cur);
1359  }
1360  for (const GlobalAlias *AncestorAlias : llvm::reverse(AliasStack))
1361  emitGlobalIndirectSymbol(M, *AncestorAlias);
1362  AliasStack.clear();
1363  }
1364  for (const auto &IFunc : M.ifuncs())
1365  emitGlobalIndirectSymbol(M, IFunc);
1366 
1367  GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
1368  assert(MI && "AsmPrinter didn't require GCModuleInfo?");
1369  for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; )
1370  if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(**--I))
1371  MP->finishAssembly(M, *MI, *this);
1372 
1373  // Emit llvm.ident metadata in an '.ident' directive.
1374  EmitModuleIdents(M);
1375 
1376  // Emit __morestack address if needed for indirect calls.
1377  if (MMI->usesMorestackAddr()) {
1378  unsigned Align = 1;
1379  MCSection *ReadOnlySection = getObjFileLowering().getSectionForConstant(
1381  /*C=*/nullptr, Align);
1382  OutStreamer->SwitchSection(ReadOnlySection);
1383 
1384  MCSymbol *AddrSymbol =
1385  OutContext.getOrCreateSymbol(StringRef("__morestack_addr"));
1386  OutStreamer->EmitLabel(AddrSymbol);
1387 
1388  unsigned PtrSize = MAI->getCodePointerSize();
1389  OutStreamer->EmitSymbolValue(GetExternalSymbolSymbol("__morestack"),
1390  PtrSize);
1391  }
1392 
1393  // Emit .note.GNU-split-stack and .note.GNU-no-split-stack sections if
1394  // split-stack is used.
1396  OutStreamer->SwitchSection(
1397  OutContext.getELFSection(".note.GNU-split-stack", ELF::SHT_PROGBITS, 0));
1398  if (MMI->hasNosplitStack())
1399  OutStreamer->SwitchSection(
1400  OutContext.getELFSection(".note.GNU-no-split-stack", ELF::SHT_PROGBITS, 0));
1401  }
1402 
1403  // If we don't have any trampolines, then we don't require stack memory
1404  // to be executable. Some targets have a directive to declare this.
1405  Function *InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline");
1406  if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty())
1408  OutStreamer->SwitchSection(S);
1409 
1410  // Allow the target to emit any magic that it wants at the end of the file,
1411  // after everything else has gone out.
1412  EmitEndOfAsmFile(M);
1413 
1414  MMI = nullptr;
1415 
1416  OutStreamer->Finish();
1417  OutStreamer->reset();
1418 
1419  return false;
1420 }
1421 
1423  if (!CurExceptionSym)
1424  CurExceptionSym = createTempSymbol("exception");
1425  return CurExceptionSym;
1426 }
1427 
1429  this->MF = &MF;
1430  // Get the function symbol.
1433  CurrentFnBegin = nullptr;
1434  CurExceptionSym = nullptr;
1435  bool NeedsLocalForSize = MAI->needsLocalForSize();
1436  if (needFuncLabelsForEHOrDebugInfo(MF, MMI) || NeedsLocalForSize) {
1437  CurrentFnBegin = createTempSymbol("func_begin");
1438  if (NeedsLocalForSize)
1439  CurrentFnSymForSize = CurrentFnBegin;
1440  }
1441 
1442  ORE = &getAnalysis<MachineOptimizationRemarkEmitterPass>().getORE();
1443  LI = &getAnalysis<MachineLoopInfo>();
1444 
1445  const TargetSubtargetInfo &STI = MF.getSubtarget();
1446  EnablePrintSchedInfo = PrintSchedule.getNumOccurrences()
1447  ? PrintSchedule
1448  : STI.supportPrintSchedInfo();
1449 }
1450 
1451 namespace {
1452 
1453 // Keep track the alignment, constpool entries per Section.
1454  struct SectionCPs {
1455  MCSection *S;
1456  unsigned Alignment;
1458 
1459  SectionCPs(MCSection *s, unsigned a) : S(s), Alignment(a) {}
1460  };
1461 
1462 } // end anonymous namespace
1463 
1464 /// EmitConstantPool - Print to the current output stream assembly
1465 /// representations of the constants in the constant pool MCP. This is
1466 /// used to print out constants which have been "spilled to memory" by
1467 /// the code generator.
1469  const MachineConstantPool *MCP = MF->getConstantPool();
1470  const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
1471  if (CP.empty()) return;
1472 
1473  // Calculate sections for constant pool entries. We collect entries to go into
1474  // the same section together to reduce amount of section switch statements.
1475  SmallVector<SectionCPs, 4> CPSections;
1476  for (unsigned i = 0, e = CP.size(); i != e; ++i) {
1477  const MachineConstantPoolEntry &CPE = CP[i];
1478  unsigned Align = CPE.getAlignment();
1479 
1480  SectionKind Kind = CPE.getSectionKind(&getDataLayout());
1481 
1482  const Constant *C = nullptr;
1483  if (!CPE.isMachineConstantPoolEntry())
1484  C = CPE.Val.ConstVal;
1485 
1487  Kind, C, Align);
1488 
1489  // The number of sections are small, just do a linear search from the
1490  // last section to the first.
1491  bool Found = false;
1492  unsigned SecIdx = CPSections.size();
1493  while (SecIdx != 0) {
1494  if (CPSections[--SecIdx].S == S) {
1495  Found = true;
1496  break;
1497  }
1498  }
1499  if (!Found) {
1500  SecIdx = CPSections.size();
1501  CPSections.push_back(SectionCPs(S, Align));
1502  }
1503 
1504  if (Align > CPSections[SecIdx].Alignment)
1505  CPSections[SecIdx].Alignment = Align;
1506  CPSections[SecIdx].CPEs.push_back(i);
1507  }
1508 
1509  // Now print stuff into the calculated sections.
1510  const MCSection *CurSection = nullptr;
1511  unsigned Offset = 0;
1512  for (unsigned i = 0, e = CPSections.size(); i != e; ++i) {
1513  for (unsigned j = 0, ee = CPSections[i].CPEs.size(); j != ee; ++j) {
1514  unsigned CPI = CPSections[i].CPEs[j];
1515  MCSymbol *Sym = GetCPISymbol(CPI);
1516  if (!Sym->isUndefined())
1517  continue;
1518 
1519  if (CurSection != CPSections[i].S) {
1520  OutStreamer->SwitchSection(CPSections[i].S);
1521  EmitAlignment(Log2_32(CPSections[i].Alignment));
1522  CurSection = CPSections[i].S;
1523  Offset = 0;
1524  }
1525 
1526  MachineConstantPoolEntry CPE = CP[CPI];
1527 
1528  // Emit inter-object padding for alignment.
1529  unsigned AlignMask = CPE.getAlignment() - 1;
1530  unsigned NewOffset = (Offset + AlignMask) & ~AlignMask;
1531  OutStreamer->EmitZeros(NewOffset - Offset);
1532 
1533  Type *Ty = CPE.getType();
1534  Offset = NewOffset + getDataLayout().getTypeAllocSize(Ty);
1535 
1536  OutStreamer->EmitLabel(Sym);
1537  if (CPE.isMachineConstantPoolEntry())
1539  else
1541  }
1542  }
1543 }
1544 
1545 /// EmitJumpTableInfo - Print assembly representations of the jump tables used
1546 /// by the current function to the current output stream.
1548  const DataLayout &DL = MF->getDataLayout();
1549  const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo();
1550  if (!MJTI) return;
1551  if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_Inline) return;
1552  const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
1553  if (JT.empty()) return;
1554 
1555  // Pick the directive to use to print the jump table entries, and switch to
1556  // the appropriate section.
1557  const Function *F = MF->getFunction();
1559  bool JTInDiffSection = !TLOF.shouldPutJumpTableInFunctionSection(
1561  *F);
1562  if (JTInDiffSection) {
1563  // Drop it in the readonly section.
1564  MCSection *ReadOnlySection = TLOF.getSectionForJumpTable(*F, TM);
1565  OutStreamer->SwitchSection(ReadOnlySection);
1566  }
1567 
1569 
1570  // Jump tables in code sections are marked with a data_region directive
1571  // where that's supported.
1572  if (!JTInDiffSection)
1573  OutStreamer->EmitDataRegion(MCDR_DataRegionJT32);
1574 
1575  for (unsigned JTI = 0, e = JT.size(); JTI != e; ++JTI) {
1576  const std::vector<MachineBasicBlock*> &JTBBs = JT[JTI].MBBs;
1577 
1578  // If this jump table was deleted, ignore it.
1579  if (JTBBs.empty()) continue;
1580 
1581  // For the EK_LabelDifference32 entry, if using .set avoids a relocation,
1582  /// emit a .set directive for each unique entry.
1586  const TargetLowering *TLI = MF->getSubtarget().getTargetLowering();
1588  for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
1589  const MachineBasicBlock *MBB = JTBBs[ii];
1590  if (!EmittedSets.insert(MBB).second)
1591  continue;
1592 
1593  // .set LJTSet, LBB32-base
1594  const MCExpr *LHS =
1596  OutStreamer->EmitAssignment(GetJTSetSymbol(JTI, MBB->getNumber()),
1597  MCBinaryExpr::createSub(LHS, Base,
1598  OutContext));
1599  }
1600  }
1601 
1602  // On some targets (e.g. Darwin) we want to emit two consecutive labels
1603  // before each jump table. The first label is never referenced, but tells
1604  // the assembler and linker the extents of the jump table object. The
1605  // second label is actually referenced by the code.
1606  if (JTInDiffSection && DL.hasLinkerPrivateGlobalPrefix())
1607  // FIXME: This doesn't have to have any specific name, just any randomly
1608  // named and numbered 'l' label would work. Simplify GetJTISymbol.
1609  OutStreamer->EmitLabel(GetJTISymbol(JTI, true));
1610 
1611  OutStreamer->EmitLabel(GetJTISymbol(JTI));
1612 
1613  for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
1614  EmitJumpTableEntry(MJTI, JTBBs[ii], JTI);
1615  }
1616  if (!JTInDiffSection)
1617  OutStreamer->EmitDataRegion(MCDR_DataRegionEnd);
1618 }
1619 
1620 /// EmitJumpTableEntry - Emit a jump table entry for the specified MBB to the
1621 /// current stream.
1622 void AsmPrinter::EmitJumpTableEntry(const MachineJumpTableInfo *MJTI,
1623  const MachineBasicBlock *MBB,
1624  unsigned UID) const {
1625  assert(MBB && MBB->getNumber() >= 0 && "Invalid basic block");
1626  const MCExpr *Value = nullptr;
1627  switch (MJTI->getEntryKind()) {
1629  llvm_unreachable("Cannot emit EK_Inline jump table entry");
1632  MJTI, MBB, UID, OutContext);
1633  break;
1635  // EK_BlockAddress - Each entry is a plain address of block, e.g.:
1636  // .word LBB123
1637  Value = MCSymbolRefExpr::create(MBB->getSymbol(), OutContext);
1638  break;
1640  // EK_GPRel32BlockAddress - Each entry is an address of block, encoded
1641  // with a relocation as gp-relative, e.g.:
1642  // .gprel32 LBB123
1643  MCSymbol *MBBSym = MBB->getSymbol();
1644  OutStreamer->EmitGPRel32Value(MCSymbolRefExpr::create(MBBSym, OutContext));
1645  return;
1646  }
1647 
1649  // EK_GPRel64BlockAddress - Each entry is an address of block, encoded
1650  // with a relocation as gp-relative, e.g.:
1651  // .gpdword LBB123
1652  MCSymbol *MBBSym = MBB->getSymbol();
1653  OutStreamer->EmitGPRel64Value(MCSymbolRefExpr::create(MBBSym, OutContext));
1654  return;
1655  }
1656 
1658  // Each entry is the address of the block minus the address of the jump
1659  // table. This is used for PIC jump tables where gprel32 is not supported.
1660  // e.g.:
1661  // .word LBB123 - LJTI1_2
1662  // If the .set directive avoids relocations, this is emitted as:
1663  // .set L4_5_set_123, LBB123 - LJTI1_2
1664  // .word L4_5_set_123
1666  Value = MCSymbolRefExpr::create(GetJTSetSymbol(UID, MBB->getNumber()),
1667  OutContext);
1668  break;
1669  }
1670  Value = MCSymbolRefExpr::create(MBB->getSymbol(), OutContext);
1671  const TargetLowering *TLI = MF->getSubtarget().getTargetLowering();
1672  const MCExpr *Base = TLI->getPICJumpTableRelocBaseExpr(MF, UID, OutContext);
1673  Value = MCBinaryExpr::createSub(Value, Base, OutContext);
1674  break;
1675  }
1676  }
1677 
1678  assert(Value && "Unknown entry kind!");
1679 
1680  unsigned EntrySize = MJTI->getEntrySize(getDataLayout());
1681  OutStreamer->EmitValue(Value, EntrySize);
1682 }
1683 
1684 /// EmitSpecialLLVMGlobal - Check to see if the specified global is a
1685 /// special global used by LLVM. If so, emit it and return true, otherwise
1686 /// do nothing and return false.
1688  if (GV->getName() == "llvm.used") {
1689  if (MAI->hasNoDeadStrip()) // No need to emit this at all.
1690  EmitLLVMUsedList(cast<ConstantArray>(GV->getInitializer()));
1691  return true;
1692  }
1693 
1694  // Ignore debug and non-emitted data. This handles llvm.compiler.used.
1695  if (GV->getSection() == "llvm.metadata" ||
1697  return true;
1698 
1699  if (!GV->hasAppendingLinkage()) return false;
1700 
1701  assert(GV->hasInitializer() && "Not a special LLVM global!");
1702 
1703  if (GV->getName() == "llvm.global_ctors") {
1704  EmitXXStructorList(GV->getParent()->getDataLayout(), GV->getInitializer(),
1705  /* isCtor */ true);
1706 
1707  return true;
1708  }
1709 
1710  if (GV->getName() == "llvm.global_dtors") {
1711  EmitXXStructorList(GV->getParent()->getDataLayout(), GV->getInitializer(),
1712  /* isCtor */ false);
1713 
1714  return true;
1715  }
1716 
1717  report_fatal_error("unknown special variable");
1718 }
1719 
1720 /// EmitLLVMUsedList - For targets that define a MAI::UsedDirective, mark each
1721 /// global in the specified llvm.used list for which emitUsedDirectiveFor
1722 /// is true, as being used with this directive.
1723 void AsmPrinter::EmitLLVMUsedList(const ConstantArray *InitList) {
1724  // Should be an array of 'i8*'.
1725  for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
1726  const GlobalValue *GV =
1728  if (GV)
1729  OutStreamer->EmitSymbolAttribute(getSymbol(GV), MCSA_NoDeadStrip);
1730  }
1731 }
1732 
1733 namespace {
1734 
1735 struct Structor {
1736  int Priority = 0;
1737  Constant *Func = nullptr;
1738  GlobalValue *ComdatKey = nullptr;
1739 
1740  Structor() = default;
1741 };
1742 
1743 } // end anonymous namespace
1744 
1745 /// EmitXXStructorList - Emit the ctor or dtor list taking into account the init
1746 /// priority.
1747 void AsmPrinter::EmitXXStructorList(const DataLayout &DL, const Constant *List,
1748  bool isCtor) {
1749  // Should be an array of '{ int, void ()* }' structs. The first value is the
1750  // init priority.
1751  if (!isa<ConstantArray>(List)) return;
1752 
1753  // Sanity check the structors list.
1754  const ConstantArray *InitList = dyn_cast<ConstantArray>(List);
1755  if (!InitList) return; // Not an array!
1756  StructType *ETy = dyn_cast<StructType>(InitList->getType()->getElementType());
1757  // FIXME: Only allow the 3-field form in LLVM 4.0.
1758  if (!ETy || ETy->getNumElements() < 2 || ETy->getNumElements() > 3)
1759  return; // Not an array of two or three elements!
1760  if (!isa<IntegerType>(ETy->getTypeAtIndex(0U)) ||
1761  !isa<PointerType>(ETy->getTypeAtIndex(1U))) return; // Not (int, ptr).
1762  if (ETy->getNumElements() == 3 && !isa<PointerType>(ETy->getTypeAtIndex(2U)))
1763  return; // Not (int, ptr, ptr).
1764 
1765  // Gather the structors in a form that's convenient for sorting by priority.
1766  SmallVector<Structor, 8> Structors;
1767  for (Value *O : InitList->operands()) {
1769  if (!CS) continue; // Malformed.
1770  if (CS->getOperand(1)->isNullValue())
1771  break; // Found a null terminator, skip the rest.
1772  ConstantInt *Priority = dyn_cast<ConstantInt>(CS->getOperand(0));
1773  if (!Priority) continue; // Malformed.
1774  Structors.push_back(Structor());
1775  Structor &S = Structors.back();
1776  S.Priority = Priority->getLimitedValue(65535);
1777  S.Func = CS->getOperand(1);
1778  if (ETy->getNumElements() == 3 && !CS->getOperand(2)->isNullValue())
1779  S.ComdatKey =
1780  dyn_cast<GlobalValue>(CS->getOperand(2)->stripPointerCasts());
1781  }
1782 
1783  // Emit the function pointers in the target-specific order
1784  unsigned Align = Log2_32(DL.getPointerPrefAlignment());
1785  std::stable_sort(Structors.begin(), Structors.end(),
1786  [](const Structor &L,
1787  const Structor &R) { return L.Priority < R.Priority; });
1788  for (Structor &S : Structors) {
1790  const MCSymbol *KeySym = nullptr;
1791  if (GlobalValue *GV = S.ComdatKey) {
1792  if (GV->isDeclarationForLinker())
1793  // If the associated variable is not defined in this module
1794  // (it might be available_externally, or have been an
1795  // available_externally definition that was dropped by the
1796  // EliminateAvailableExternally pass), some other TU
1797  // will provide its dynamic initializer.
1798  continue;
1799 
1800  KeySym = getSymbol(GV);
1801  }
1802  MCSection *OutputSection =
1803  (isCtor ? Obj.getStaticCtorSection(S.Priority, KeySym)
1804  : Obj.getStaticDtorSection(S.Priority, KeySym));
1805  OutStreamer->SwitchSection(OutputSection);
1806  if (OutStreamer->getCurrentSection() != OutStreamer->getPreviousSection())
1807  EmitAlignment(Align);
1808  EmitXXStructor(DL, S.Func);
1809  }
1810 }
1811 
1812 void AsmPrinter::EmitModuleIdents(Module &M) {
1813  if (!MAI->hasIdentDirective())
1814  return;
1815 
1816  if (const NamedMDNode *NMD = M.getNamedMetadata("llvm.ident")) {
1817  for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) {
1818  const MDNode *N = NMD->getOperand(i);
1819  assert(N->getNumOperands() == 1 &&
1820  "llvm.ident metadata entry can have only one operand");
1821  const MDString *S = cast<MDString>(N->getOperand(0));
1822  OutStreamer->EmitIdent(S->getString());
1823  }
1824  }
1825 }
1826 
1827 //===--------------------------------------------------------------------===//
1828 // Emission and print routines
1829 //
1830 
1831 /// EmitInt8 - Emit a byte directive and value.
1832 ///
1833 void AsmPrinter::EmitInt8(int Value) const {
1834  OutStreamer->EmitIntValue(Value, 1);
1835 }
1836 
1837 /// EmitInt16 - Emit a short directive and value.
1838 void AsmPrinter::EmitInt16(int Value) const {
1839  OutStreamer->EmitIntValue(Value, 2);
1840 }
1841 
1842 /// EmitInt32 - Emit a long directive and value.
1843 void AsmPrinter::EmitInt32(int Value) const {
1844  OutStreamer->EmitIntValue(Value, 4);
1845 }
1846 
1847 /// Emit something like ".long Hi-Lo" where the size in bytes of the directive
1848 /// is specified by Size and Hi/Lo specify the labels. This implicitly uses
1849 /// .set if it avoids relocations.
1851  unsigned Size) const {
1852  OutStreamer->emitAbsoluteSymbolDiff(Hi, Lo, Size);
1853 }
1854 
1855 /// EmitLabelPlusOffset - Emit something like ".long Label+Offset"
1856 /// where the size in bytes of the directive is specified by Size and Label
1857 /// specifies the label. This implicitly uses .set if it is available.
1859  unsigned Size,
1860  bool IsSectionRelative) const {
1861  if (MAI->needsDwarfSectionOffsetDirective() && IsSectionRelative) {
1862  OutStreamer->EmitCOFFSecRel32(Label, Offset);
1863  if (Size > 4)
1864  OutStreamer->EmitZeros(Size - 4);
1865  return;
1866  }
1867 
1868  // Emit Label+Offset (or just Label if Offset is zero)
1869  const MCExpr *Expr = MCSymbolRefExpr::create(Label, OutContext);
1870  if (Offset)
1871  Expr = MCBinaryExpr::createAdd(
1872  Expr, MCConstantExpr::create(Offset, OutContext), OutContext);
1873 
1874  OutStreamer->EmitValue(Expr, Size);
1875 }
1876 
1877 //===----------------------------------------------------------------------===//
1878 
1879 // EmitAlignment - Emit an alignment directive to the specified power of
1880 // two boundary. For example, if you pass in 3 here, you will get an 8
1881 // byte alignment. If a global value is specified, and if that global has
1882 // an explicit alignment requested, it will override the alignment request
1883 // if required for correctness.
1884 void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalObject *GV) const {
1885  if (GV)
1886  NumBits = getGVAlignmentLog2(GV, GV->getParent()->getDataLayout(), NumBits);
1887 
1888  if (NumBits == 0) return; // 1-byte aligned: no need to emit alignment.
1889 
1890  assert(NumBits <
1891  static_cast<unsigned>(std::numeric_limits<unsigned>::digits) &&
1892  "undefined behavior");
1893  if (getCurrentSection()->getKind().isText())
1894  OutStreamer->EmitCodeAlignment(1u << NumBits);
1895  else
1896  OutStreamer->EmitValueToAlignment(1u << NumBits);
1897 }
1898 
1899 //===----------------------------------------------------------------------===//
1900 // Constant emission.
1901 //===----------------------------------------------------------------------===//
1902 
1904  MCContext &Ctx = OutContext;
1905 
1906  if (CV->isNullValue() || isa<UndefValue>(CV))
1907  return MCConstantExpr::create(0, Ctx);
1908 
1909  if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV))
1910  return MCConstantExpr::create(CI->getZExtValue(), Ctx);
1911 
1912  if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV))
1913  return MCSymbolRefExpr::create(getSymbol(GV), Ctx);
1914 
1915  if (const BlockAddress *BA = dyn_cast<BlockAddress>(CV))
1917 
1918  const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV);
1919  if (!CE) {
1920  llvm_unreachable("Unknown constant value to lower!");
1921  }
1922 
1923  switch (CE->getOpcode()) {
1924  default:
1925  // If the code isn't optimized, there may be outstanding folding
1926  // opportunities. Attempt to fold the expression using DataLayout as a
1927  // last resort before giving up.
1929  if (C != CE)
1930  return lowerConstant(C);
1931 
1932  // Otherwise report the problem to the user.
1933  {
1934  std::string S;
1935  raw_string_ostream OS(S);
1936  OS << "Unsupported expression in static initializer: ";
1937  CE->printAsOperand(OS, /*PrintType=*/false,
1938  !MF ? nullptr : MF->getFunction()->getParent());
1939  report_fatal_error(OS.str());
1940  }
1941  case Instruction::GetElementPtr: {
1942  // Generate a symbolic expression for the byte address
1943  APInt OffsetAI(getDataLayout().getPointerTypeSizeInBits(CE->getType()), 0);
1944  cast<GEPOperator>(CE)->accumulateConstantOffset(getDataLayout(), OffsetAI);
1945 
1946  const MCExpr *Base = lowerConstant(CE->getOperand(0));
1947  if (!OffsetAI)
1948  return Base;
1949 
1950  int64_t Offset = OffsetAI.getSExtValue();
1951  return MCBinaryExpr::createAdd(Base, MCConstantExpr::create(Offset, Ctx),
1952  Ctx);
1953  }
1954 
1955  case Instruction::Trunc:
1956  // We emit the value and depend on the assembler to truncate the generated
1957  // expression properly. This is important for differences between
1958  // blockaddress labels. Since the two labels are in the same function, it
1959  // is reasonable to treat their delta as a 32-bit value.
1961  case Instruction::BitCast:
1962  return lowerConstant(CE->getOperand(0));
1963 
1964  case Instruction::IntToPtr: {
1965  const DataLayout &DL = getDataLayout();
1966 
1967  // Handle casts to pointers by changing them into casts to the appropriate
1968  // integer type. This promotes constant folding and simplifies this code.
1969  Constant *Op = CE->getOperand(0);
1971  false/*ZExt*/);
1972  return lowerConstant(Op);
1973  }
1974 
1975  case Instruction::PtrToInt: {
1976  const DataLayout &DL = getDataLayout();
1977 
1978  // Support only foldable casts to/from pointers that can be eliminated by
1979  // changing the pointer to the appropriately sized integer type.
1980  Constant *Op = CE->getOperand(0);
1981  Type *Ty = CE->getType();
1982 
1983  const MCExpr *OpExpr = lowerConstant(Op);
1984 
1985  // We can emit the pointer value into this slot if the slot is an
1986  // integer slot equal to the size of the pointer.
1987  if (DL.getTypeAllocSize(Ty) == DL.getTypeAllocSize(Op->getType()))
1988  return OpExpr;
1989 
1990  // Otherwise the pointer is smaller than the resultant integer, mask off
1991  // the high bits so we are sure to get a proper truncation if the input is
1992  // a constant expr.
1993  unsigned InBits = DL.getTypeAllocSizeInBits(Op->getType());
1994  const MCExpr *MaskExpr = MCConstantExpr::create(~0ULL >> (64-InBits), Ctx);
1995  return MCBinaryExpr::createAnd(OpExpr, MaskExpr, Ctx);
1996  }
1997 
1998  case Instruction::Sub: {
1999  GlobalValue *LHSGV;
2000  APInt LHSOffset;
2001  if (IsConstantOffsetFromGlobal(CE->getOperand(0), LHSGV, LHSOffset,
2002  getDataLayout())) {
2003  GlobalValue *RHSGV;
2004  APInt RHSOffset;
2005  if (IsConstantOffsetFromGlobal(CE->getOperand(1), RHSGV, RHSOffset,
2006  getDataLayout())) {
2007  const MCExpr *RelocExpr =
2008  getObjFileLowering().lowerRelativeReference(LHSGV, RHSGV, TM);
2009  if (!RelocExpr)
2010  RelocExpr = MCBinaryExpr::createSub(
2011  MCSymbolRefExpr::create(getSymbol(LHSGV), Ctx),
2012  MCSymbolRefExpr::create(getSymbol(RHSGV), Ctx), Ctx);
2013  int64_t Addend = (LHSOffset - RHSOffset).getSExtValue();
2014  if (Addend != 0)
2015  RelocExpr = MCBinaryExpr::createAdd(
2016  RelocExpr, MCConstantExpr::create(Addend, Ctx), Ctx);
2017  return RelocExpr;
2018  }
2019  }
2020  }
2021  // else fallthrough
2022 
2023  // The MC library also has a right-shift operator, but it isn't consistently
2024  // signed or unsigned between different targets.
2025  case Instruction::Add:
2026  case Instruction::Mul:
2027  case Instruction::SDiv:
2028  case Instruction::SRem:
2029  case Instruction::Shl:
2030  case Instruction::And:
2031  case Instruction::Or:
2032  case Instruction::Xor: {
2033  const MCExpr *LHS = lowerConstant(CE->getOperand(0));
2034  const MCExpr *RHS = lowerConstant(CE->getOperand(1));
2035  switch (CE->getOpcode()) {
2036  default: llvm_unreachable("Unknown binary operator constant cast expr");
2037  case Instruction::Add: return MCBinaryExpr::createAdd(LHS, RHS, Ctx);
2038  case Instruction::Sub: return MCBinaryExpr::createSub(LHS, RHS, Ctx);
2039  case Instruction::Mul: return MCBinaryExpr::createMul(LHS, RHS, Ctx);
2040  case Instruction::SDiv: return MCBinaryExpr::createDiv(LHS, RHS, Ctx);
2041  case Instruction::SRem: return MCBinaryExpr::createMod(LHS, RHS, Ctx);
2042  case Instruction::Shl: return MCBinaryExpr::createShl(LHS, RHS, Ctx);
2043  case Instruction::And: return MCBinaryExpr::createAnd(LHS, RHS, Ctx);
2044  case Instruction::Or: return MCBinaryExpr::createOr (LHS, RHS, Ctx);
2045  case Instruction::Xor: return MCBinaryExpr::createXor(LHS, RHS, Ctx);
2046  }
2047  }
2048  }
2049 }
2050 
2051 static void emitGlobalConstantImpl(const DataLayout &DL, const Constant *C,
2052  AsmPrinter &AP,
2053  const Constant *BaseCV = nullptr,
2054  uint64_t Offset = 0);
2055 
2056 static void emitGlobalConstantFP(const ConstantFP *CFP, AsmPrinter &AP);
2057 
2058 /// isRepeatedByteSequence - Determine whether the given value is
2059 /// composed of a repeated sequence of identical bytes and return the
2060 /// byte value. If it is not a repeated sequence, return -1.
2063  assert(!Data.empty() && "Empty aggregates should be CAZ node");
2064  char C = Data[0];
2065  for (unsigned i = 1, e = Data.size(); i != e; ++i)
2066  if (Data[i] != C) return -1;
2067  return static_cast<uint8_t>(C); // Ensure 255 is not returned as -1.
2068 }
2069 
2070 /// isRepeatedByteSequence - Determine whether the given value is
2071 /// composed of a repeated sequence of identical bytes and return the
2072 /// byte value. If it is not a repeated sequence, return -1.
2073 static int isRepeatedByteSequence(const Value *V, const DataLayout &DL) {
2074  if (const ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
2075  uint64_t Size = DL.getTypeAllocSizeInBits(V->getType());
2076  assert(Size % 8 == 0);
2077 
2078  // Extend the element to take zero padding into account.
2079  APInt Value = CI->getValue().zextOrSelf(Size);
2080  if (!Value.isSplat(8))
2081  return -1;
2082 
2083  return Value.zextOrTrunc(8).getZExtValue();
2084  }
2085  if (const ConstantArray *CA = dyn_cast<ConstantArray>(V)) {
2086  // Make sure all array elements are sequences of the same repeated
2087  // byte.
2088  assert(CA->getNumOperands() != 0 && "Should be a CAZ");
2089  Constant *Op0 = CA->getOperand(0);
2090  int Byte = isRepeatedByteSequence(Op0, DL);
2091  if (Byte == -1)
2092  return -1;
2093 
2094  // All array elements must be equal.
2095  for (unsigned i = 1, e = CA->getNumOperands(); i != e; ++i)
2096  if (CA->getOperand(i) != Op0)
2097  return -1;
2098  return Byte;
2099  }
2100 
2101  if (const ConstantDataSequential *CDS = dyn_cast<ConstantDataSequential>(V))
2102  return isRepeatedByteSequence(CDS);
2103 
2104  return -1;
2105 }
2106 
2108  const ConstantDataSequential *CDS,
2109  AsmPrinter &AP) {
2110  // See if we can aggregate this into a .fill, if so, emit it as such.
2111  int Value = isRepeatedByteSequence(CDS, DL);
2112  if (Value != -1) {
2113  uint64_t Bytes = DL.getTypeAllocSize(CDS->getType());
2114  // Don't emit a 1-byte object as a .fill.
2115  if (Bytes > 1)
2116  return AP.OutStreamer->emitFill(Bytes, Value);
2117  }
2118 
2119  // If this can be emitted with .ascii/.asciz, emit it as such.
2120  if (CDS->isString())
2121  return AP.OutStreamer->EmitBytes(CDS->getAsString());
2122 
2123  // Otherwise, emit the values in successive locations.
2124  unsigned ElementByteSize = CDS->getElementByteSize();
2125  if (isa<IntegerType>(CDS->getElementType())) {
2126  for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) {
2127  if (AP.isVerbose())
2128  AP.OutStreamer->GetCommentOS() << format("0x%" PRIx64 "\n",
2129  CDS->getElementAsInteger(i));
2130  AP.OutStreamer->EmitIntValue(CDS->getElementAsInteger(i),
2131  ElementByteSize);
2132  }
2133  } else {
2134  for (unsigned I = 0, E = CDS->getNumElements(); I != E; ++I)
2135  emitGlobalConstantFP(cast<ConstantFP>(CDS->getElementAsConstant(I)), AP);
2136  }
2137 
2138  unsigned Size = DL.getTypeAllocSize(CDS->getType());
2139  unsigned EmittedSize = DL.getTypeAllocSize(CDS->getType()->getElementType()) *
2140  CDS->getNumElements();
2141  if (unsigned Padding = Size - EmittedSize)
2142  AP.OutStreamer->EmitZeros(Padding);
2143 }
2144 
2145 static void emitGlobalConstantArray(const DataLayout &DL,
2146  const ConstantArray *CA, AsmPrinter &AP,
2147  const Constant *BaseCV, uint64_t Offset) {
2148  // See if we can aggregate some values. Make sure it can be
2149  // represented as a series of bytes of the constant value.
2150  int Value = isRepeatedByteSequence(CA, DL);
2151 
2152  if (Value != -1) {
2153  uint64_t Bytes = DL.getTypeAllocSize(CA->getType());
2154  AP.OutStreamer->emitFill(Bytes, Value);
2155  }
2156  else {
2157  for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i) {
2158  emitGlobalConstantImpl(DL, CA->getOperand(i), AP, BaseCV, Offset);
2159  Offset += DL.getTypeAllocSize(CA->getOperand(i)->getType());
2160  }
2161  }
2162 }
2163 
2164 static void emitGlobalConstantVector(const DataLayout &DL,
2165  const ConstantVector *CV, AsmPrinter &AP) {
2166  for (unsigned i = 0, e = CV->getType()->getNumElements(); i != e; ++i)
2167  emitGlobalConstantImpl(DL, CV->getOperand(i), AP);
2168 
2169  unsigned Size = DL.getTypeAllocSize(CV->getType());
2170  unsigned EmittedSize = DL.getTypeAllocSize(CV->getType()->getElementType()) *
2171  CV->getType()->getNumElements();
2172  if (unsigned Padding = Size - EmittedSize)
2173  AP.OutStreamer->EmitZeros(Padding);
2174 }
2175 
2176 static void emitGlobalConstantStruct(const DataLayout &DL,
2177  const ConstantStruct *CS, AsmPrinter &AP,
2178  const Constant *BaseCV, uint64_t Offset) {
2179  // Print the fields in successive locations. Pad to align if needed!
2180  unsigned Size = DL.getTypeAllocSize(CS->getType());
2181  const StructLayout *Layout = DL.getStructLayout(CS->getType());
2182  uint64_t SizeSoFar = 0;
2183  for (unsigned i = 0, e = CS->getNumOperands(); i != e; ++i) {
2184  const Constant *Field = CS->getOperand(i);
2185 
2186  // Print the actual field value.
2187  emitGlobalConstantImpl(DL, Field, AP, BaseCV, Offset + SizeSoFar);
2188 
2189  // Check if padding is needed and insert one or more 0s.
2190  uint64_t FieldSize = DL.getTypeAllocSize(Field->getType());
2191  uint64_t PadSize = ((i == e-1 ? Size : Layout->getElementOffset(i+1))
2192  - Layout->getElementOffset(i)) - FieldSize;
2193  SizeSoFar += FieldSize + PadSize;
2194 
2195  // Insert padding - this may include padding to increase the size of the
2196  // current field up to the ABI size (if the struct is not packed) as well
2197  // as padding to ensure that the next field starts at the right offset.
2198  AP.OutStreamer->EmitZeros(PadSize);
2199  }
2200  assert(SizeSoFar == Layout->getSizeInBytes() &&
2201  "Layout of constant struct may be incorrect!");
2202 }
2203 
2204 static void emitGlobalConstantFP(const ConstantFP *CFP, AsmPrinter &AP) {
2205  APInt API = CFP->getValueAPF().bitcastToAPInt();
2206 
2207  // First print a comment with what we think the original floating-point value
2208  // should have been.
2209  if (AP.isVerbose()) {
2211  CFP->getValueAPF().toString(StrVal);
2212 
2213  if (CFP->getType())
2214  CFP->getType()->print(AP.OutStreamer->GetCommentOS());
2215  else
2216  AP.OutStreamer->GetCommentOS() << "Printing <null> Type";
2217  AP.OutStreamer->GetCommentOS() << ' ' << StrVal << '\n';
2218  }
2219 
2220  // Now iterate through the APInt chunks, emitting them in endian-correct
2221  // order, possibly with a smaller chunk at beginning/end (e.g. for x87 80-bit
2222  // floats).
2223  unsigned NumBytes = API.getBitWidth() / 8;
2224  unsigned TrailingBytes = NumBytes % sizeof(uint64_t);
2225  const uint64_t *p = API.getRawData();
2226 
2227  // PPC's long double has odd notions of endianness compared to how LLVM
2228  // handles it: p[0] goes first for *big* endian on PPC.
2229  if (AP.getDataLayout().isBigEndian() && !CFP->getType()->isPPC_FP128Ty()) {
2230  int Chunk = API.getNumWords() - 1;
2231 
2232  if (TrailingBytes)
2233  AP.OutStreamer->EmitIntValue(p[Chunk--], TrailingBytes);
2234 
2235  for (; Chunk >= 0; --Chunk)
2236  AP.OutStreamer->EmitIntValue(p[Chunk], sizeof(uint64_t));
2237  } else {
2238  unsigned Chunk;
2239  for (Chunk = 0; Chunk < NumBytes / sizeof(uint64_t); ++Chunk)
2240  AP.OutStreamer->EmitIntValue(p[Chunk], sizeof(uint64_t));
2241 
2242  if (TrailingBytes)
2243  AP.OutStreamer->EmitIntValue(p[Chunk], TrailingBytes);
2244  }
2245 
2246  // Emit the tail padding for the long double.
2247  const DataLayout &DL = AP.getDataLayout();
2248  AP.OutStreamer->EmitZeros(DL.getTypeAllocSize(CFP->getType()) -
2249  DL.getTypeStoreSize(CFP->getType()));
2250 }
2251 
2253  const DataLayout &DL = AP.getDataLayout();
2254  unsigned BitWidth = CI->getBitWidth();
2255 
2256  // Copy the value as we may massage the layout for constants whose bit width
2257  // is not a multiple of 64-bits.
2258  APInt Realigned(CI->getValue());
2259  uint64_t ExtraBits = 0;
2260  unsigned ExtraBitsSize = BitWidth & 63;
2261 
2262  if (ExtraBitsSize) {
2263  // The bit width of the data is not a multiple of 64-bits.
2264  // The extra bits are expected to be at the end of the chunk of the memory.
2265  // Little endian:
2266  // * Nothing to be done, just record the extra bits to emit.
2267  // Big endian:
2268  // * Record the extra bits to emit.
2269  // * Realign the raw data to emit the chunks of 64-bits.
2270  if (DL.isBigEndian()) {
2271  // Basically the structure of the raw data is a chunk of 64-bits cells:
2272  // 0 1 BitWidth / 64
2273  // [chunk1][chunk2] ... [chunkN].
2274  // The most significant chunk is chunkN and it should be emitted first.
2275  // However, due to the alignment issue chunkN contains useless bits.
2276  // Realign the chunks so that they contain only useless information:
2277  // ExtraBits 0 1 (BitWidth / 64) - 1
2278  // chu[nk1 chu][nk2 chu] ... [nkN-1 chunkN]
2279  ExtraBits = Realigned.getRawData()[0] &
2280  (((uint64_t)-1) >> (64 - ExtraBitsSize));
2281  Realigned.lshrInPlace(ExtraBitsSize);
2282  } else
2283  ExtraBits = Realigned.getRawData()[BitWidth / 64];
2284  }
2285 
2286  // We don't expect assemblers to support integer data directives
2287  // for more than 64 bits, so we emit the data in at most 64-bit
2288  // quantities at a time.
2289  const uint64_t *RawData = Realigned.getRawData();
2290  for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) {
2291  uint64_t Val = DL.isBigEndian() ? RawData[e - i - 1] : RawData[i];
2292  AP.OutStreamer->EmitIntValue(Val, 8);
2293  }
2294 
2295  if (ExtraBitsSize) {
2296  // Emit the extra bits after the 64-bits chunks.
2297 
2298  // Emit a directive that fills the expected size.
2299  uint64_t Size = AP.getDataLayout().getTypeAllocSize(CI->getType());
2300  Size -= (BitWidth / 64) * 8;
2301  assert(Size && Size * 8 >= ExtraBitsSize &&
2302  (ExtraBits & (((uint64_t)-1) >> (64 - ExtraBitsSize)))
2303  == ExtraBits && "Directive too small for extra bits.");
2304  AP.OutStreamer->EmitIntValue(ExtraBits, Size);
2305  }
2306 }
2307 
2308 /// \brief Transform a not absolute MCExpr containing a reference to a GOT
2309 /// equivalent global, by a target specific GOT pc relative access to the
2310 /// final symbol.
2311 static void handleIndirectSymViaGOTPCRel(AsmPrinter &AP, const MCExpr **ME,
2312  const Constant *BaseCst,
2313  uint64_t Offset) {
2314  // The global @foo below illustrates a global that uses a got equivalent.
2315  //
2316  // @bar = global i32 42
2317  // @gotequiv = private unnamed_addr constant i32* @bar
2318  // @foo = i32 trunc (i64 sub (i64 ptrtoint (i32** @gotequiv to i64),
2319  // i64 ptrtoint (i32* @foo to i64))
2320  // to i32)
2321  //
2322  // The cstexpr in @foo is converted into the MCExpr `ME`, where we actually
2323  // check whether @foo is suitable to use a GOTPCREL. `ME` is usually in the
2324  // form:
2325  //
2326  // foo = cstexpr, where
2327  // cstexpr := <gotequiv> - "." + <cst>
2328  // cstexpr := <gotequiv> - (<foo> - <offset from @foo base>) + <cst>
2329  //
2330  // After canonicalization by evaluateAsRelocatable `ME` turns into:
2331  //
2332  // cstexpr := <gotequiv> - <foo> + gotpcrelcst, where
2333  // gotpcrelcst := <offset from @foo base> + <cst>
2334  MCValue MV;
2335  if (!(*ME)->evaluateAsRelocatable(MV, nullptr, nullptr) || MV.isAbsolute())
2336  return;
2337  const MCSymbolRefExpr *SymA = MV.getSymA();
2338  if (!SymA)
2339  return;
2340 
2341  // Check that GOT equivalent symbol is cached.
2342  const MCSymbol *GOTEquivSym = &SymA->getSymbol();
2343  if (!AP.GlobalGOTEquivs.count(GOTEquivSym))
2344  return;
2345 
2346  const GlobalValue *BaseGV = dyn_cast_or_null<GlobalValue>(BaseCst);
2347  if (!BaseGV)
2348  return;
2349 
2350  // Check for a valid base symbol
2351  const MCSymbol *BaseSym = AP.getSymbol(BaseGV);
2352  const MCSymbolRefExpr *SymB = MV.getSymB();
2353 
2354  if (!SymB || BaseSym != &SymB->getSymbol())
2355  return;
2356 
2357  // Make sure to match:
2358  //
2359  // gotpcrelcst := <offset from @foo base> + <cst>
2360  //
2361  // If gotpcrelcst is positive it means that we can safely fold the pc rel
2362  // displacement into the GOTPCREL. We can also can have an extra offset <cst>
2363  // if the target knows how to encode it.
2364  int64_t GOTPCRelCst = Offset + MV.getConstant();
2365  if (GOTPCRelCst < 0)
2366  return;
2367  if (!AP.getObjFileLowering().supportGOTPCRelWithOffset() && GOTPCRelCst != 0)
2368  return;
2369 
2370  // Emit the GOT PC relative to replace the got equivalent global, i.e.:
2371  //
2372  // bar:
2373  // .long 42
2374  // gotequiv:
2375  // .quad bar
2376  // foo:
2377  // .long gotequiv - "." + <cst>
2378  //
2379  // is replaced by the target specific equivalent to:
2380  //
2381  // bar:
2382  // .long 42
2383  // foo:
2384  // .long bar@GOTPCREL+<gotpcrelcst>
2385  AsmPrinter::GOTEquivUsePair Result = AP.GlobalGOTEquivs[GOTEquivSym];
2386  const GlobalVariable *GV = Result.first;
2387  int NumUses = (int)Result.second;
2388  const GlobalValue *FinalGV = dyn_cast<GlobalValue>(GV->getOperand(0));
2389  const MCSymbol *FinalSym = AP.getSymbol(FinalGV);
2391  FinalSym, MV, Offset, AP.MMI, *AP.OutStreamer);
2392 
2393  // Update GOT equivalent usage information
2394  --NumUses;
2395  if (NumUses >= 0)
2396  AP.GlobalGOTEquivs[GOTEquivSym] = std::make_pair(GV, NumUses);
2397 }
2398 
2399 static void emitGlobalConstantImpl(const DataLayout &DL, const Constant *CV,
2400  AsmPrinter &AP, const Constant *BaseCV,
2401  uint64_t Offset) {
2402  uint64_t Size = DL.getTypeAllocSize(CV->getType());
2403 
2404  // Globals with sub-elements such as combinations of arrays and structs
2405  // are handled recursively by emitGlobalConstantImpl. Keep track of the
2406  // constant symbol base and the current position with BaseCV and Offset.
2407  if (!BaseCV && CV->hasOneUse())
2408  BaseCV = dyn_cast<Constant>(CV->user_back());
2409 
2410  if (isa<ConstantAggregateZero>(CV) || isa<UndefValue>(CV))
2411  return AP.OutStreamer->EmitZeros(Size);
2412 
2413  if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
2414  switch (Size) {
2415  case 1:
2416  case 2:
2417  case 4:
2418  case 8:
2419  if (AP.isVerbose())
2420  AP.OutStreamer->GetCommentOS() << format("0x%" PRIx64 "\n",
2421  CI->getZExtValue());
2422  AP.OutStreamer->EmitIntValue(CI->getZExtValue(), Size);
2423  return;
2424  default:
2426  return;
2427  }
2428  }
2429 
2430  if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV))
2431  return emitGlobalConstantFP(CFP, AP);
2432 
2433  if (isa<ConstantPointerNull>(CV)) {
2434  AP.OutStreamer->EmitIntValue(0, Size);
2435  return;
2436  }
2437 
2438  if (const ConstantDataSequential *CDS = dyn_cast<ConstantDataSequential>(CV))
2439  return emitGlobalConstantDataSequential(DL, CDS, AP);
2440 
2441  if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV))
2442  return emitGlobalConstantArray(DL, CVA, AP, BaseCV, Offset);
2443 
2444  if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV))
2445  return emitGlobalConstantStruct(DL, CVS, AP, BaseCV, Offset);
2446 
2447  if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) {
2448  // Look through bitcasts, which might not be able to be MCExpr'ized (e.g. of
2449  // vectors).
2450  if (CE->getOpcode() == Instruction::BitCast)
2451  return emitGlobalConstantImpl(DL, CE->getOperand(0), AP);
2452 
2453  if (Size > 8) {
2454  // If the constant expression's size is greater than 64-bits, then we have
2455  // to emit the value in chunks. Try to constant fold the value and emit it
2456  // that way.
2457  Constant *New = ConstantFoldConstant(CE, DL);
2458  if (New && New != CE)
2459  return emitGlobalConstantImpl(DL, New, AP);
2460  }
2461  }
2462 
2463  if (const ConstantVector *V = dyn_cast<ConstantVector>(CV))
2464  return emitGlobalConstantVector(DL, V, AP);
2465 
2466  // Otherwise, it must be a ConstantExpr. Lower it to an MCExpr, then emit it
2467  // thread the streamer with EmitValue.
2468  const MCExpr *ME = AP.lowerConstant(CV);
2469 
2470  // Since lowerConstant already folded and got rid of all IR pointer and
2471  // integer casts, detect GOT equivalent accesses by looking into the MCExpr
2472  // directly.
2474  handleIndirectSymViaGOTPCRel(AP, &ME, BaseCV, Offset);
2475 
2476  AP.OutStreamer->EmitValue(ME, Size);
2477 }
2478 
2479 /// EmitGlobalConstant - Print a general LLVM constant to the .s file.
2481  uint64_t Size = DL.getTypeAllocSize(CV->getType());
2482  if (Size)
2483  emitGlobalConstantImpl(DL, CV, *this);
2484  else if (MAI->hasSubsectionsViaSymbols()) {
2485  // If the global has zero size, emit a single byte so that two labels don't
2486  // look like they are at the same location.
2487  OutStreamer->EmitIntValue(0, 1);
2488  }
2489 }
2490 
2492  // Target doesn't support this yet!
2493  llvm_unreachable("Target does not support EmitMachineConstantPoolValue");
2494 }
2495 
2496 void AsmPrinter::printOffset(int64_t Offset, raw_ostream &OS) const {
2497  if (Offset > 0)
2498  OS << '+' << Offset;
2499  else if (Offset < 0)
2500  OS << Offset;
2501 }
2502 
2503 //===----------------------------------------------------------------------===//
2504 // Symbol Lowering Routines.
2505 //===----------------------------------------------------------------------===//
2506 
2508  return OutContext.createTempSymbol(Name, true);
2509 }
2510 
2512  return MMI->getAddrLabelSymbol(BA->getBasicBlock());
2513 }
2514 
2516  return MMI->getAddrLabelSymbol(BB);
2517 }
2518 
2519 /// GetCPISymbol - Return the symbol for the specified constant pool entry.
2520 MCSymbol *AsmPrinter::GetCPISymbol(unsigned CPID) const {
2521  const DataLayout &DL = getDataLayout();
2523  "CPI" + Twine(getFunctionNumber()) + "_" +
2524  Twine(CPID));
2525 }
2526 
2527 /// GetJTISymbol - Return the symbol for the specified jump table entry.
2528 MCSymbol *AsmPrinter::GetJTISymbol(unsigned JTID, bool isLinkerPrivate) const {
2529  return MF->getJTISymbol(JTID, OutContext, isLinkerPrivate);
2530 }
2531 
2532 /// GetJTSetSymbol - Return the symbol for the specified jump table .set
2533 /// FIXME: privatize to AsmPrinter.
2534 MCSymbol *AsmPrinter::GetJTSetSymbol(unsigned UID, unsigned MBBID) const {
2535  const DataLayout &DL = getDataLayout();
2537  Twine(getFunctionNumber()) + "_" +
2538  Twine(UID) + "_set_" + Twine(MBBID));
2539 }
2540 
2542  StringRef Suffix) const {
2543  return getObjFileLowering().getSymbolWithGlobalValueBase(GV, Suffix, TM);
2544 }
2545 
2546 /// Return the MCSymbol for the specified ExternalSymbol.
2548  SmallString<60> NameStr;
2549  Mangler::getNameWithPrefix(NameStr, Sym, getDataLayout());
2550  return OutContext.getOrCreateSymbol(NameStr);
2551 }
2552 
2553 /// PrintParentLoopComment - Print comments about parent loops of this one.
2555  unsigned FunctionNumber) {
2556  if (!Loop) return;
2558  OS.indent(Loop->getLoopDepth()*2)
2559  << "Parent Loop BB" << FunctionNumber << "_"
2560  << Loop->getHeader()->getNumber()
2561  << " Depth=" << Loop->getLoopDepth() << '\n';
2562 }
2563 
2564 /// PrintChildLoopComment - Print comments about child loops within
2565 /// the loop for this basic block, with nesting.
2567  unsigned FunctionNumber) {
2568  // Add child loop information
2569  for (const MachineLoop *CL : *Loop) {
2570  OS.indent(CL->getLoopDepth()*2)
2571  << "Child Loop BB" << FunctionNumber << "_"
2572  << CL->getHeader()->getNumber() << " Depth " << CL->getLoopDepth()
2573  << '\n';
2574  PrintChildLoopComment(OS, CL, FunctionNumber);
2575  }
2576 }
2577 
2578 /// emitBasicBlockLoopComments - Pretty-print comments for basic blocks.
2580  const MachineLoopInfo *LI,
2581  const AsmPrinter &AP) {
2582  // Add loop depth information
2583  const MachineLoop *Loop = LI->getLoopFor(&MBB);
2584  if (!Loop) return;
2585 
2586  MachineBasicBlock *Header = Loop->getHeader();
2587  assert(Header && "No header for loop");
2588 
2589  // If this block is not a loop header, just print out what is the loop header
2590  // and return.
2591  if (Header != &MBB) {
2592  AP.OutStreamer->AddComment(" in Loop: Header=BB" +
2593  Twine(AP.getFunctionNumber())+"_" +
2594  Twine(Loop->getHeader()->getNumber())+
2595  " Depth="+Twine(Loop->getLoopDepth()));
2596  return;
2597  }
2598 
2599  // Otherwise, it is a loop header. Print out information about child and
2600  // parent loops.
2601  raw_ostream &OS = AP.OutStreamer->GetCommentOS();
2602 
2604 
2605  OS << "=>";
2606  OS.indent(Loop->getLoopDepth()*2-2);
2607 
2608  OS << "This ";
2609  if (Loop->empty())
2610  OS << "Inner ";
2611  OS << "Loop Header: Depth=" + Twine(Loop->getLoopDepth()) << '\n';
2612 
2613  PrintChildLoopComment(OS, Loop, AP.getFunctionNumber());
2614 }
2615 
2616 void AsmPrinter::setupCodePaddingContext(const MachineBasicBlock &MBB,
2617  MCCodePaddingContext &Context) const {
2618  assert(MF != nullptr && "Machine function must be valid");
2619  assert(LI != nullptr && "Loop info must be valid");
2620  Context.IsPaddingActive = !MF->hasInlineAsm() &&
2621  !MF->getFunction()->optForSize() &&
2623  const MachineLoop *CurrentLoop = LI->getLoopFor(&MBB);
2625  CurrentLoop != nullptr && CurrentLoop->getSubLoops().empty();
2627  std::find(MBB.pred_begin(), MBB.pred_end(), MBB.getPrevNode()) !=
2628  MBB.pred_end();
2630  MBB.pred_size() > 0 && !isBlockOnlyReachableByFallthrough(&MBB);
2631 }
2632 
2633 /// EmitBasicBlockStart - This method prints the label for the specified
2634 /// MachineBasicBlock, an alignment (if present) and a comment describing
2635 /// it if appropriate.
2637  // End the previous funclet and start a new one.
2638  if (MBB.isEHFuncletEntry()) {
2639  for (const HandlerInfo &HI : Handlers) {
2640  HI.Handler->endFunclet();
2641  HI.Handler->beginFunclet(MBB);
2642  }
2643  }
2644 
2645  // Emit an alignment directive for this block, if needed.
2646  if (unsigned Align = MBB.getAlignment())
2649  setupCodePaddingContext(MBB, Context);
2650  OutStreamer->EmitCodePaddingBasicBlockStart(Context);
2651 
2652  // If the block has its address taken, emit any labels that were used to
2653  // reference the block. It is possible that there is more than one label
2654  // here, because multiple LLVM BB's may have been RAUW'd to this block after
2655  // the references were generated.
2656  if (MBB.hasAddressTaken()) {
2657  const BasicBlock *BB = MBB.getBasicBlock();
2658  if (isVerbose())
2659  OutStreamer->AddComment("Block address taken");
2660 
2661  // MBBs can have their address taken as part of CodeGen without having
2662  // their corresponding BB's address taken in IR
2663  if (BB->hasAddressTaken())
2664  for (MCSymbol *Sym : MMI->getAddrLabelSymbolToEmit(BB))
2665  OutStreamer->EmitLabel(Sym);
2666  }
2667 
2668  // Print some verbose block comments.
2669  if (isVerbose()) {
2670  if (const BasicBlock *BB = MBB.getBasicBlock()) {
2671  if (BB->hasName()) {
2672  BB->printAsOperand(OutStreamer->GetCommentOS(),
2673  /*PrintType=*/false, BB->getModule());
2674  OutStreamer->GetCommentOS() << '\n';
2675  }
2676  }
2677  emitBasicBlockLoopComments(MBB, LI, *this);
2678  }
2679 
2680  // Print the main label for the block.
2681  if (MBB.pred_empty() ||
2683  if (isVerbose()) {
2684  // NOTE: Want this comment at start of line, don't emit with AddComment.
2685  OutStreamer->emitRawComment(" BB#" + Twine(MBB.getNumber()) + ":", false);
2686  }
2687  } else {
2688  OutStreamer->EmitLabel(MBB.getSymbol());
2689  }
2690 }
2691 
2694  setupCodePaddingContext(MBB, Context);
2695  OutStreamer->EmitCodePaddingBasicBlockEnd(Context);
2696 }
2697 
2698 void AsmPrinter::EmitVisibility(MCSymbol *Sym, unsigned Visibility,
2699  bool IsDefinition) const {
2700  MCSymbolAttr Attr = MCSA_Invalid;
2701 
2702  switch (Visibility) {
2703  default: break;
2705  if (IsDefinition)
2706  Attr = MAI->getHiddenVisibilityAttr();
2707  else
2709  break;
2711  Attr = MAI->getProtectedVisibilityAttr();
2712  break;
2713  }
2714 
2715  if (Attr != MCSA_Invalid)
2716  OutStreamer->EmitSymbolAttribute(Sym, Attr);
2717 }
2718 
2719 /// isBlockOnlyReachableByFallthough - Return true if the basic block has
2720 /// exactly one predecessor and the control transfer mechanism between
2721 /// the predecessor and this block is a fall-through.
2722 bool AsmPrinter::
2724  // If this is a landing pad, it isn't a fall through. If it has no preds,
2725  // then nothing falls through to it.
2726  if (MBB->isEHPad() || MBB->pred_empty())
2727  return false;
2728 
2729  // If there isn't exactly one predecessor, it can't be a fall through.
2730  if (MBB->pred_size() > 1)
2731  return false;
2732 
2733  // The predecessor has to be immediately before this block.
2734  MachineBasicBlock *Pred = *MBB->pred_begin();
2735  if (!Pred->isLayoutSuccessor(MBB))
2736  return false;
2737 
2738  // If the block is completely empty, then it definitely does fall through.
2739  if (Pred->empty())
2740  return true;
2741 
2742  // Check the terminators in the previous blocks
2743  for (const auto &MI : Pred->terminators()) {
2744  // If it is not a simple branch, we are in a table somewhere.
2745  if (!MI.isBranch() || MI.isIndirectBranch())
2746  return false;
2747 
2748  // If we are the operands of one of the branches, this is not a fall
2749  // through. Note that targets with delay slots will usually bundle
2750  // terminators with the delay slot instruction.
2751  for (ConstMIBundleOperands OP(MI); OP.isValid(); ++OP) {
2752  if (OP->isJTI())
2753  return false;
2754  if (OP->isMBB() && OP->getMBB() == MBB)
2755  return false;
2756  }
2757  }
2758 
2759  return true;
2760 }
2761 
2762 GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy &S) {
2763  if (!S.usesMetadata())
2764  return nullptr;
2765 
2766  assert(!S.useStatepoints() && "statepoints do not currently support custom"
2767  " stackmap formats, please see the documentation for a description of"
2768  " the default format. If you really need a custom serialized format,"
2769  " please file a bug");
2770 
2771  gcp_map_type &GCMap = getGCMap(GCMetadataPrinters);
2772  gcp_map_type::iterator GCPI = GCMap.find(&S);
2773  if (GCPI != GCMap.end())
2774  return GCPI->second.get();
2775 
2776  auto Name = S.getName();
2777 
2780  E = GCMetadataPrinterRegistry::end(); I != E; ++I)
2781  if (Name == I->getName()) {
2782  std::unique_ptr<GCMetadataPrinter> GMP = I->instantiate();
2783  GMP->S = &S;
2784  auto IterBool = GCMap.insert(std::make_pair(&S, std::move(GMP)));
2785  return IterBool.first->second.get();
2786  }
2787 
2788  report_fatal_error("no GCMetadataPrinter registered for GC: " + Twine(Name));
2789 }
2790 
2791 /// Pin vtable to this file.
2793 
2795 
2796 // In the binary's "xray_instr_map" section, an array of these function entries
2797 // describes each instrumentation point. When XRay patches your code, the index
2798 // into this table will be given to your handler as a patch point identifier.
2800  const MCSymbol *CurrentFnSym) const {
2801  Out->EmitSymbolValue(Sled, Bytes);
2802  Out->EmitSymbolValue(CurrentFnSym, Bytes);
2803  auto Kind8 = static_cast<uint8_t>(Kind);
2804  Out->EmitBinaryData(StringRef(reinterpret_cast<const char *>(&Kind8), 1));
2805  Out->EmitBinaryData(
2806  StringRef(reinterpret_cast<const char *>(&AlwaysInstrument), 1));
2807  Out->EmitBinaryData(StringRef(reinterpret_cast<const char *>(&Version), 1));
2808  auto Padding = (4 * Bytes) - ((2 * Bytes) + 3);
2809  assert(Padding >= 0 && "Instrumentation map entry > 4 * Word Size");
2810  Out->EmitZeros(Padding);
2811 }
2812 
2814  if (Sleds.empty())
2815  return;
2816 
2817  auto PrevSection = OutStreamer->getCurrentSectionOnly();
2818  auto Fn = MF->getFunction();
2819  MCSection *InstMap = nullptr;
2820  MCSection *FnSledIndex = nullptr;
2822  auto Associated = dyn_cast<MCSymbolELF>(CurrentFnSym);
2823  assert(Associated != nullptr);
2825  std::string GroupName;
2826  if (Fn->hasComdat()) {
2827  Flags |= ELF::SHF_GROUP;
2828  GroupName = Fn->getComdat()->getName();
2829  }
2830 
2831  auto UniqueID = ++XRayFnUniqueID;
2832  InstMap =
2833  OutContext.getELFSection("xray_instr_map", ELF::SHT_PROGBITS, Flags, 0,
2834  GroupName, UniqueID, Associated);
2835  FnSledIndex =
2836  OutContext.getELFSection("xray_fn_idx", ELF::SHT_PROGBITS, Flags, 0,
2837  GroupName, UniqueID, Associated);
2838  } else if (MF->getSubtarget().getTargetTriple().isOSBinFormatMachO()) {
2839  InstMap = OutContext.getMachOSection("__DATA", "xray_instr_map", 0,
2841  FnSledIndex = OutContext.getMachOSection("__DATA", "xray_fn_idx", 0,
2843  } else {
2844  llvm_unreachable("Unsupported target");
2845  }
2846 
2847  auto WordSizeBytes = MAI->getCodePointerSize();
2848 
2849  // Now we switch to the instrumentation map section. Because this is done
2850  // per-function, we are able to create an index entry that will represent the
2851  // range of sleds associated with a function.
2852  MCSymbol *SledsStart = OutContext.createTempSymbol("xray_sleds_start", true);
2853  OutStreamer->SwitchSection(InstMap);
2854  OutStreamer->EmitLabel(SledsStart);
2855  for (const auto &Sled : Sleds)
2856  Sled.emit(WordSizeBytes, OutStreamer.get(), CurrentFnSym);
2857  MCSymbol *SledsEnd = OutContext.createTempSymbol("xray_sleds_end", true);
2858  OutStreamer->EmitLabel(SledsEnd);
2859 
2860  // We then emit a single entry in the index per function. We use the symbols
2861  // that bound the instrumentation map as the range for a specific function.
2862  // Each entry here will be 2 * word size aligned, as we're writing down two
2863  // pointers. This should work for both 32-bit and 64-bit platforms.
2864  OutStreamer->SwitchSection(FnSledIndex);
2865  OutStreamer->EmitCodeAlignment(2 * WordSizeBytes);
2866  OutStreamer->EmitSymbolValue(SledsStart, WordSizeBytes, false);
2867  OutStreamer->EmitSymbolValue(SledsEnd, WordSizeBytes, false);
2868  OutStreamer->SwitchSection(PrevSection);
2869  Sleds.clear();
2870 }
2871 
2873  SledKind Kind, uint8_t Version) {
2874  auto Fn = MI.getMF()->getFunction();
2875  auto Attr = Fn->getFnAttribute("function-instrument");
2876  bool LogArgs = Fn->hasFnAttribute("xray-log-args");
2877  bool AlwaysInstrument =
2878  Attr.isStringAttribute() && Attr.getValueAsString() == "xray-always";
2879  if (Kind == SledKind::FUNCTION_ENTER && LogArgs)
2880  Kind = SledKind::LOG_ARGS_ENTER;
2881  Sleds.emplace_back(XRayFunctionEntry{Sled, CurrentFnSym, Kind,
2882  AlwaysInstrument, Fn, Version});
2883 }
2884 
2886  return OutStreamer->getContext().getDwarfVersion();
2887 }
2888 
2890  OutStreamer->getContext().setDwarfVersion(Version);
2891 }
virtual void EmitGlobalVariable(const GlobalVariable *GV)
Emit the specified global variable to the .s file.
Definition: AsmPrinter.cpp:438
void setDwarfVersion(uint16_t Version)
bool isDeclarationForLinker() const
Definition: GlobalValue.h:514
MachineConstantPoolValue * MachineCPVal
uint64_t CallInst * C
bool isOSDarwin() const
isOSDarwin - Is this a "Darwin" OS (OS X, iOS, or watchOS).
Definition: Triple.h:470
StringRef getSection() const
Get the custom section of this global if it has one.
Definition: GlobalObject.h:90
const TargetLoweringObjectFile & getObjFileLowering() const
Return information about object file lowering.
Definition: AsmPrinter.cpp:205
Instances of this class represent a uniqued identifier for a section in the current translation unit...
Definition: MCSection.h:39
IntegerType * getType() const
getType - Specialize the getType() method to always return an IntegerType, which reduces the amount o...
Definition: Constants.h:172
void push_back(const T &Elt)
Definition: SmallVector.h:212
bool doesSetDirectiveSuppressReloc() const
Definition: MCAsmInfo.h:508
virtual void EmitStartOfAsmFile(Module &)
This virtual method can be overridden by targets that want to emit something at the start of their fi...
Definition: AsmPrinter.h:360
void getiOSVersion(unsigned &Major, unsigned &Minor, unsigned &Micro) const
getiOSVersion - Parse the version number as with getOSVersion.
Definition: Triple.cpp:1065
A parsed version of the target data layout string in and methods for querying it. ...
Definition: DataLayout.h:109
static void emitGlobalConstantLargeInt(const ConstantInt *CI, AsmPrinter &AP)
constexpr char Align[]
Key for Kernel::Arg::Metadata::mAlign.
StringRef getTargetFeatureString() const
bool usesWindowsCFI() const
Definition: MCAsmInfo.h:568
MCSymbolAttr getHiddenVisibilityAttr() const
Definition: MCAsmInfo.h:538
The MachineConstantPool class keeps track of constants referenced by a function which must be spilled...
const std::vector< MachineJumpTableEntry > & getJumpTables() const
bool isThreadData() const
Definition: SectionKind.h:154
bool hasLocalLinkage() const
Definition: GlobalValue.h:427
unsigned getOpcode() const
Return the opcode at the root of this constant expression.
Definition: Constants.h:1171
Special purpose, only applies to global arrays.
Definition: GlobalValue.h:55
uint64_t getZExtValue() const
Get zero extended value.
Definition: APInt.h:1542
LLVMContext & Context
static void emitBasicBlockLoopComments(const MachineBasicBlock &MBB, const MachineLoopInfo *LI, const AsmPrinter &AP)
emitBasicBlockLoopComments - Pretty-print comments for basic blocks.
DiagnosticInfoOptimizationBase::Argument NV
unsigned XRayFnUniqueID
Definition: AsmPrinter.h:252
std::unique_ptr< MCStreamer > OutStreamer
This is the MCStreamer object for the file we are generating.
Definition: AsmPrinter.h:92
bool hasDebugInfo() const
Returns true if valid debug info is present.
unsigned getFunctionNumber() const
getFunctionNumber - Return a unique ID for the current function.
MCSymbol * GetExternalSymbolSymbol(StringRef Sym) const
Return the MCSymbol for the specified ExternalSymbol.
static const MCSymbolRefExpr * create(const MCSymbol *Symbol, MCContext &Ctx)
Definition: MCExpr.h:305
static const char *const DbgTimerDescription
Definition: AsmPrinter.cpp:130
MCTargetOptions MCOptions
Machine level options.
virtual MCSection * getStaticCtorSection(unsigned Priority, const MCSymbol *KeySym) const
bool hasPrivateLinkage() const
Definition: GlobalValue.h:426
const MachineFunction * getMF() const
Return the function that contains the basic block that this instruction belongs to.
const Constant * getInitializer() const
getInitializer - Return the initializer for this global variable.
const std::vector< MCCFIInstruction > & getFrameInstructions() const
Returns a reference to a list of cfi instructions in the function&#39;s prologue.
LLVM_ATTRIBUTE_NORETURN void report_fatal_error(Error Err, bool gen_crash_diag=true)
Report a serious error, calling any installed error handler.
Definition: Error.cpp:115
Compute iterated dominance frontiers using a linear time algorithm.
Definition: AllocatorList.h:24
void EmitSymbolValue(const MCSymbol *Sym, unsigned Size, bool IsSectionRelative=false)
Special case of EmitValue that avoids the client having to pass in a MCExpr for MCSymbols.
Definition: MCStreamer.cpp:127
bool isVariable() const
isVariable - Check if this is a variable symbol.
Definition: MCSymbol.h:295
bool isMacOSX() const
isMacOSX - Is this a Mac OS X triple.
Definition: Triple.h:442
MCSection * SectionForGlobal(const GlobalObject *GO, SectionKind Kind, const TargetMachine &TM) const
This method computes the appropriate section to emit the specified global variable or function defini...
.type _foo, STT_OBJECT # aka
Definition: MCDirectives.h:25
This represents an "assembler immediate".
Definition: MCValue.h:40
static bool isGOTEquivalentCandidate(const GlobalVariable *GV, unsigned &NumGOTEquivUsers)
Only consider global GOT equivalents if at least one user is a cstexpr inside an initializer of anoth...
Constant * getElementAsConstant(unsigned i) const
Return a Constant for a specified index&#39;s element.
Definition: Constants.cpp:2645
bool hasMachoTBSSDirective() const
Definition: MCAsmInfo.h:460
StringRef getPrivateGlobalPrefix() const
Definition: DataLayout.h:281
void EmitInt8(int Value) const
Emit a byte directive and value.
MCSymbol - Instances of this class represent a symbol name in the MC file, and MCSymbols are created ...
Definition: MCSymbol.h:42
Not a valid directive.
Definition: MCDirectives.h:20
A Module instance is used to store all the information related to an LLVM module. ...
Definition: Module.h:63
void redefineIfPossible()
Prepare this symbol to be redefined.
Definition: MCSymbol.h:231
unsigned getPointerSize() const
Get the pointer size for this target.
MCSection * getTLSBSSSection() const
unsigned getPointerPrefAlignment(unsigned AS=0) const
Return target&#39;s alignment for stack-based pointers FIXME: The defaults need to be removed once all of...
Definition: DataLayout.cpp:596
LLVM_ATTRIBUTE_ALWAYS_INLINE size_type size() const
Definition: SmallVector.h:136
bool doesSupportDebugInformation() const
Definition: MCAsmInfo.h:548
bool hasSingleParameterDotFile() const
Definition: MCAsmInfo.h:524
bool doFinalization(Module &M) override
Shut down the asmprinter.
SmallVector< std::unique_ptr< GCStrategy >, 1 >::const_iterator iterator
Definition: GCMetadata.h:183
Same, but only replaced by something equivalent.
Definition: GlobalValue.h:54
static void emitGlobalConstantDataSequential(const DataLayout &DL, const ConstantDataSequential *CDS, AsmPrinter &AP)
bool isOSBinFormatELF() const
Tests whether the OS uses the ELF binary format.
Definition: Triple.h:588
virtual int getFrameIndexReference(const MachineFunction &MF, int FI, unsigned &FrameReg) const
getFrameIndexReference - This method should return the base register and offset used to reference a f...
MCContext & OutContext
This is the context for the output file that we are streaming.
Definition: AsmPrinter.h:87
static cl::opt< bool > PrintSchedule("print-schedule", cl::Hidden, cl::init(false), cl::desc("Print 'sched: [latency:throughput]' in .s output"))
virtual const TargetRegisterInfo * getRegisterInfo() const
getRegisterInfo - If register information is available, return it.
bool hasLinkOnceDirective() const
Definition: MCAsmInfo.h:536
bool canBeOmittedFromSymbolTable(const GlobalValue *GV)
True if GV can be left out of the object symbol table.
Definition: ObjectUtils.h:22
.watchos_version_min
Definition: MCDirectives.h:68
unsigned getLoopDepth() const
Return the nesting level of this loop.
Definition: LoopInfo.h:92
Available for inspection, not emission.
Definition: GlobalValue.h:50
unsigned getNumWords() const
Get the number of words.
Definition: APInt.h:1495
unsigned getNumElements() const
Random access to the elements.
Definition: DerivedTypes.h:313
const StructLayout * getStructLayout(StructType *Ty) const
Returns a StructLayout object, indicating the alignment of the struct, its size, and the offsets of i...
Definition: DataLayout.cpp:562
bool EnablePrintSchedInfo
Enable print [latency:throughput] in output.
Definition: AsmPrinter.h:118
const MCSubtargetInfo & getSubtargetInfo() const
Return information about subtarget.
Definition: AsmPrinter.cpp:217
DWARF-like instruction based exceptions.
uint16_t getDwarfVersion() const
unsigned getReg() const
getReg - Returns the register number.
LLVM_NODISCARD LLVM_ATTRIBUTE_ALWAYS_INLINE size_t size() const
size - Get the string size.
Definition: StringRef.h:138
CFIMoveType needsCFIMoves() const
Definition: AsmPrinter.cpp:917
virtual void EmitJumpTableInfo()
Print assembly representations of the jump tables used by the current function to the current output ...
static int isRepeatedByteSequence(const ConstantDataSequential *V)
isRepeatedByteSequence - Determine whether the given value is composed of a repeated sequence of iden...
Collects and handles dwarf debug information.
Definition: DwarfDebug.h:196
bool hasAvailableExternallyLinkage() const
Definition: GlobalValue.h:414
.ios_version_min
Definition: MCDirectives.h:65
virtual void EmitXXStructor(const DataLayout &DL, const Constant *CV)
Targets can override this to change how global constants that are part of a C++ static/global constru...
Definition: AsmPrinter.h:397
This file contains the declarations for metadata subclasses.
EK_Inline - Jump table entries are emitted inline at their point of use.
const MachineFunction * MF
The current machine function.
Definition: AsmPrinter.h:95
format_object< Ts... > format(const char *Fmt, const Ts &... Vals)
These are helper functions used to produce formatted output.
Definition: Format.h:124
virtual const TargetLowering * getTargetLowering() const
raw_ostream & indent(unsigned NumSpaces)
indent - Insert &#39;NumSpaces&#39; spaces.
bool hasDotTypeDotSizeDirective() const
Definition: MCAsmInfo.h:523
bool needsDwarfSectionOffsetDirective() const
Definition: MCAsmInfo.h:453
float convertToFloat() const
Definition: APFloat.h:1098
uint64_t getElementByteSize() const
Return the size (in bytes) of each element in the array/vector.
Definition: Constants.cpp:2301
bool isWatchOS() const
Is this an Apple watchOS triple.
Definition: Triple.h:461
Like Internal, but omit from symbol table.
Definition: GlobalValue.h:57
Externally visible function.
Definition: GlobalValue.h:49
uint64_t getSize() const
Return the size in bytes of the memory reference.
bool IsConstantOffsetFromGlobal(Constant *C, GlobalValue *&GV, APInt &Offset, const DataLayout &DL)
If this constant is a constant offset from a global, return the global and the constant.
#define DEBUG_TYPE
Definition: AsmPrinter.cpp:125
bool hasPrologueData() const
Check whether this function has prologue data.
Definition: Function.h:652
bool isAbsolute() const
Is this an absolute (as opposed to relocatable) value.
Definition: MCValue.h:53
static const char *const DWARFGroupName
Definition: AsmPrinter.cpp:127
A raw_ostream that writes to an SmallVector or SmallString.
Definition: raw_ostream.h:489
virtual void EmitConstantPool()
Print to the current output stream assembly representations of the constants in the constant pool MCP...
STATISTIC(NumFunctions, "Total number of functions")
Metadata node.
Definition: Metadata.h:862
static const MCBinaryExpr * createAnd(const MCExpr *LHS, const MCExpr *RHS, MCContext &Ctx)
Definition: MCExpr.h:448
F(f)
setjmp/longjmp based exceptions
const MDOperand & getOperand(unsigned I) const
Definition: Metadata.h:1067
.macosx_version_min
Definition: MCDirectives.h:66
ELFYAML::ELF_STV Visibility
Definition: ELFYAML.cpp:735
APInt zextOrTrunc(unsigned width) const
Zero extend or truncate to width.
Definition: APInt.cpp:883
static const MCBinaryExpr * createMul(const MCExpr *LHS, const MCExpr *RHS, MCContext &Ctx)
Definition: MCExpr.h:498
std::pair< const GlobalVariable *, unsigned > GOTEquivUsePair
Map global GOT equivalent MCSymbols to GlobalVariables and keep track of its number of uses by other ...
Definition: AsmPrinter.h:114
static void emitKill(const MachineInstr *MI, AsmPrinter &AP)
Definition: AsmPrinter.cpp:811
static const char *const DWARFGroupDescription
Definition: AsmPrinter.cpp:128
bool isImm() const
isImm - Tests if this is a MO_Immediate operand.
bool hasIdentDirective() const
Definition: MCAsmInfo.h:525
bool isPPC_FP128Ty() const
Return true if this is powerpc long double.
Definition: Type.h:159
DenseMap< GCStrategy *, std::unique_ptr< GCMetadataPrinter > > gcp_map_type
Definition: AsmPrinter.cpp:145
Tentative definitions.
Definition: GlobalValue.h:59
unsigned getBitWidth() const
getBitWidth - Return the bitwidth of this constant.
Definition: Constants.h:143
union llvm::MachineConstantPoolEntry::@140 Val
The constant itself.
bool hasMachoZeroFillDirective() const
Definition: MCAsmInfo.h:459
WinEH::EncodingType getWinEHEncodingType() const
Definition: MCAsmInfo.h:555
virtual void EmitInstruction(const MCInst &Inst, const MCSubtargetInfo &STI, bool PrintSchedInfo=false)
Emit the given Instruction into the current section.
Definition: MCStreamer.cpp:863
unsigned getBitWidth() const
Return the number of bits in the APInt.
Definition: APInt.h:1488
Constant * getPrologueData() const
Get the prologue data associated with this function.
Definition: Function.cpp:1280
virtual MCSection * getStaticDtorSection(unsigned Priority, const MCSymbol *KeySym) const
const Triple & getTargetTriple() const
getTargetTriple - Return the target triple string.
The address of a basic block.
Definition: Constants.h:813
void emit(DiagnosticInfoOptimizationBase &OptDiag)
Emit an optimization remark.
static const MCBinaryExpr * createXor(const MCExpr *LHS, const MCExpr *RHS, MCContext &Ctx)
Definition: MCExpr.h:533
bool hasSection() const
Definition: GlobalValue.h:261
AnalysisUsage & addRequired()
int64_t getConstant() const
Definition: MCValue.h:47
Used to lazily calculate structure layout information for a target machine, based on the DataLayout s...
Definition: DataLayout.h:491
void recordSled(MCSymbol *Sled, const MachineInstr &MI, SledKind Kind, uint8_t Version=0)
const MCSymbolRefExpr * getSymB() const
Definition: MCValue.h:49
virtual void EmitDebugThreadLocal(const MCExpr *Value, unsigned Size) const
Emit the directive and value for debug thread local expression.
Definition: AsmPrinter.cpp:636
static void emitGlobalConstantFP(const ConstantFP *CFP, AsmPrinter &AP)
A tuple of MDNodes.
Definition: Metadata.h:1323
bool hasPrefixData() const
Check whether this function has prefix data.
Definition: Function.h:643
A description of a memory reference used in the backend.
static Constant * getIntegerCast(Constant *C, Type *Ty, bool isSigned)
Create a ZExt, Bitcast or Trunc for integer -> integer casts.
Definition: Constants.cpp:1518
Definition: BitVector.h:920
Emits exception handling directives.
Definition: EHStreamer.h:31
StringRef getName() const
MCSymbol * createLinkerPrivateTempSymbol()
Create and return a new linker temporary symbol with a unique but unspecified name.
Definition: MCContext.cpp:209
bool isMachineConstantPoolEntry() const
isMachineConstantPoolEntry - Return true if the MachineConstantPoolEntry is indeed a target specific ...
Type * getPointerElementType() const
Definition: Type.h:373
This file declares the MachineConstantPool class which is an abstract constant pool to keep track of ...
const DataLayout & getDataLayout() const
Get the data layout for the module&#39;s target platform.
Definition: Module.cpp:361
MachineFunctionPass - This class adapts the FunctionPass interface to allow convenient creation of pa...
virtual void EmitEndOfAsmFile(Module &)
This virtual method can be overridden by targets that want to emit something at the end of their file...
Definition: AsmPrinter.h:364
Twine - A lightweight data structure for efficiently representing the concatenation of temporary valu...
Definition: Twine.h:81
bool isStringAttribute() const
Return true if the attribute is a string (target-dependent) attribute.
Definition: Attributes.cpp:170
const HexagonInstrInfo * TII
static void emitGlobalConstantStruct(const DataLayout &DL, const ConstantStruct *CS, AsmPrinter &AP, const Constant *BaseCV, uint64_t Offset)
unsigned getPointerTypeSize(Type *Ty) const
Definition: DataLayout.h:355
const ConstantFP * getFPImm() const
unsigned getNumOperands() const
Access to explicit operands of the instruction.
Definition: MachineInstr.h:293
StringRef getRawDataValues() const
Return the raw, underlying, bytes of this data.
Definition: Constants.cpp:2275
Class to represent struct types.
Definition: DerivedTypes.h:201
This class is basically a combination of TimeRegion and Timer.
Definition: Timer.h:160
bool isKnownWindowsMSVCEnvironment() const
Checks if the environment is MSVC.
Definition: Triple.h:530
bool isConstant() const
If the value is a global constant, its value is immutable throughout the runtime execution of the pro...
static const MCBinaryExpr * createDiv(const MCExpr *LHS, const MCExpr *RHS, MCContext &Ctx)
Definition: MCExpr.h:453
Base class for the full range of assembler expressions which are needed for parsing.
Definition: MCExpr.h:36
Reg
All possible values of the reg field in the ModR/M byte.
iterator_range< iterator > terminators()
unsigned getAlignment() const
getAlignment - Return the alignment (log2, not bytes) of the function.
Represent a reference to a symbol from inside an expression.
Definition: MCExpr.h:165
The MachineFrameInfo class represents an abstract stack frame until prolog/epilog code is inserted...
void getNameWithPrefix(SmallVectorImpl< char > &Name, const GlobalValue *GV, Mangler &Mang, bool MayAlwaysUsePrivate=false) const
bool getCommDirectiveSupportsAlignment() const
MCSection * getBSSSection() const
SmallVector< XRayFunctionEntry, 4 > Sleds
Definition: AsmPrinter.h:249
.local (ELF)
Definition: MCDirectives.h:35
An analysis pass which caches information about the entire Module.
Definition: GCMetadata.h:154
MCSection * getDataSection() const
const char * getWeakRefDirective() const
Definition: MCAsmInfo.h:529
void EmitAlignment(unsigned NumBits, const GlobalObject *GO=nullptr) const
Emit an alignment directive to the specified power of two boundary.
uint64_t getNumElements() const
Definition: DerivedTypes.h:359
.no_dead_strip (MachO)
Definition: MCDirectives.h:36
This class defines information used to lower LLVM code to legal SelectionDAG operators that the targe...
unsigned getCFIIndex() const
This file implements a class to represent arbitrary precision integral constant values and operations...
bool hasCommonLinkage() const
Definition: GlobalValue.h:431
INLINEASM - Represents an inline asm block.
Definition: ISDOpcodes.h:634
Constant * getPrefixData() const
Get the prefix data associated with this function.
Definition: Function.cpp:1270
BlockT * getHeader() const
Definition: LoopInfo.h:100
static const char *const CodeViewLineTablesGroupName
Definition: AsmPrinter.cpp:133
unsigned getPointerSize() const
Return the pointer size from the TargetMachine.
Definition: AsmPrinter.cpp:215
Diagnostic information for optimization analysis remarks.
void emitXRayTable()
Emit a table with all XRay instrumentation points.
Context object for machine code objects.
Definition: MCContext.h:59
auto reverse(ContainerTy &&C, typename std::enable_if< has_rbegin< ContainerTy >::value >::type *=nullptr) -> decltype(make_range(C.rbegin(), C.rend()))
Definition: STLExtras.h:232
bool hasExternalLinkage() const
Definition: GlobalValue.h:413
unsigned getEntryAlignment(const DataLayout &TD) const
getEntryAlignment - Return the alignment of each entry in the jump table.
Constant * ConstantFoldConstant(const Constant *C, const DataLayout &DL, const TargetLibraryInfo *TLI=nullptr)
ConstantFoldConstant - Attempt to fold the constant using the specified DataLayout.
static bool needFuncLabelsForEHOrDebugInfo(const MachineFunction &MF, MachineModuleInfo *MMI)
Definition: AsmPrinter.cpp:967
static const MCBinaryExpr * createShl(const MCExpr *LHS, const MCExpr *RHS, MCContext &Ctx)
Definition: MCExpr.h:513
void getAnalysisUsage(AnalysisUsage &AU) const override
Record analysis usage.
Definition: AsmPrinter.cpp:231
bool isNullValue() const
Return true if this is the value that would be returned by getNullValue.
Definition: Constants.cpp:86
A constant value that is initialized with an expression using other constant values.
Definition: Constants.h:862
void EmitFunctionBody()
This method emits the body and trailer for a function.
Definition: AsmPrinter.cpp:982
int64_t getSExtValue() const
Get sign extended value.
Definition: APInt.h:1554
const std::string & getName() const
Return the name of the GC strategy.
Definition: GCStrategy.h:104
Type * getType() const
All values are typed, get the type of this value.
Definition: Value.h:245
opStatus convert(const fltSemantics &ToSemantics, roundingMode RM, bool *losesInfo)
Definition: APFloat.cpp:4441
static const MCBinaryExpr * createSub(const MCExpr *LHS, const MCExpr *RHS, MCContext &Ctx)
Definition: MCExpr.h:528
MCSectionMachO * getMachOSection(StringRef Segment, StringRef Section, unsigned TypeAndAttributes, unsigned Reserved2, SectionKind K, const char *BeginSymName=nullptr)
Return the MCSection for the specified mach-o section.
Definition: MCContext.cpp:271
void toString(SmallVectorImpl< char > &Str, unsigned FormatPrecision=0, unsigned FormatMaxPadding=3, bool TruncateZero=true) const
Definition: APFloat.h:1167
ConstantDataSequential - A vector or array constant whose element type is a simple 1/2/4/8-byte integ...
Definition: Constants.h:565
virtual void EmitBasicBlockEnd(const MachineBasicBlock &MBB)
Targets can override this to emit stuff at the end of a basic block.
bool isPositionIndependent() const
Definition: AsmPrinter.cpp:196
EK_LabelDifference32 - Each entry is the address of the block minus the address of the jump table...
bool supportGOTPCRelWithOffset() const
Target GOT "PC"-relative relocation supports encoding an additional binary expression with an offset...
#define T
.type _foo, STT_GNU_IFUNC
Definition: MCDirectives.h:24
VisibilityTypes
An enumeration for the kinds of visibility of global values.
Definition: GlobalValue.h:63
void EmitInt16(int Value) const
Emit a short directive and value.
.alt_entry (MachO)
Definition: MCDirectives.h:38
LLVM_NODISCARD LLVM_ATTRIBUTE_ALWAYS_INLINE bool empty() const
empty - Check if the string is empty.
Definition: StringRef.h:133
NamedMDNode * getNamedMetadata(const Twine &Name) const
Return the first NamedMDNode in the module with the specified name.
Definition: Module.cpp:242
bool isBSSLocal() const
Definition: SectionKind.h:161
EK_BlockAddress - Each entry is a plain address of block, e.g.
const APInt & getValue() const
Return the constant as an APInt value reference.
Definition: Constants.h:138
BasicBlock * getBasicBlock() const
Definition: Constants.h:840
bool isFPImm() const
isFPImm - Tests if this is a MO_FPImmediate operand.
bool hasFunctionAlignment() const
Definition: MCAsmInfo.h:522
bool hasPersonalityFn() const
Check whether this function has a personality function.
Definition: Function.h:634
This class is a data container for one entry in a MachineConstantPool.
virtual const MCExpr * LowerCustomJumpTableEntry(const MachineJumpTableInfo *, const MachineBasicBlock *, unsigned, MCContext &) const
int getNumber() const
MachineBasicBlocks are uniquely numbered at the function level, unless they&#39;re not in a MachineFuncti...
LinkageTypes getLinkage() const
Definition: GlobalValue.h:441
virtual void EmitBinaryData(StringRef Data)
Functionally identical to EmitBytes.
Definition: MCStreamer.cpp:916
virtual const TargetInstrInfo * getInstrInfo() const
static const fltSemantics & IEEEdouble() LLVM_READNONE
Definition: APFloat.cpp:122
StringRef getTargetCPU() const
ArrayRef< MCSymbol * > getAddrLabelSymbolToEmit(const BasicBlock *BB)
Return the symbol to be used for the specified basic block when its address is taken.
unsigned getAlignment() const
Definition: Globals.cpp:97
void printOffset(int64_t Offset, raw_ostream &OS) const
This is just convenient handler for printing offsets.
static const MCBinaryExpr * createAdd(const MCExpr *LHS, const MCExpr *RHS, MCContext &Ctx)
Definition: MCExpr.h:443
bool hasLinkOnceLinkage() const
Definition: GlobalValue.h:417
bool isWindowsItaniumEnvironment() const
Definition: Triple.h:538
This file contains the declaration of the Comdat class, which represents a single COMDAT in LLVM...
Printable PrintReg(unsigned Reg, const TargetRegisterInfo *TRI=nullptr, unsigned SubRegIdx=0)
Prints virtual and physical registers with or without a TRI instance.
bool isVerbose() const
Return true if assembly output should contain comments.
Definition: AsmPrinter.h:189
bool hasNoDeadStrip() const
Definition: MCAsmInfo.h:526
const std::string & str() const
Definition: Triple.h:354
Type * getElementType() const
Return the element type of the array/vector.
Definition: Constants.cpp:2271
void emitGlobalGOTEquivs()
Constant expressions using GOT equivalent globals may not be eligible for PC relative GOT entry conve...
MachineModuleInfo * MMI
This is a pointer to the current MachineModuleInfo.
Definition: AsmPrinter.h:98
Value * getOperand(unsigned i) const
Definition: User.h:154
Instances of this class represent a single low-level machine instruction.
Definition: MCInst.h:159
const DataLayout & getDataLayout() const
Return the DataLayout attached to the Module associated to this MF.
static void handleIndirectSymViaGOTPCRel(AsmPrinter &AP, const MCExpr **ME, const Constant *BaseCst, uint64_t Offset)
Transform a not absolute MCExpr containing a reference to a GOT equivalent global, by a target specific GOT pc relative access to the final symbol.
const std::string & getSourceFileName() const
Get the module&#39;s original source file name.
Definition: Module.h:214
static bool canBeHidden(const GlobalValue *GV, const MCAsmInfo &MAI)
Definition: AsmPrinter.cpp:380
static void emitGlobalConstantArray(const DataLayout &DL, const ConstantArray *CA, AsmPrinter &AP, const Constant *BaseCV, uint64_t Offset)
void EmitLabelPlusOffset(const MCSymbol *Label, uint64_t Offset, unsigned Size, bool IsSectionRelative=false) const
Emit something like ".long Label+Offset" where the size in bytes of the directive is specified by Siz...
unsigned getCodeViewFlag() const
Returns the CodeView Version by checking module flags.
Definition: Module.cpp:460
TargetInstrInfo - Interface to description of machine instruction set.
bool hasAppendingLinkage() const
Definition: GlobalValue.h:424
void EmitInt32(int Value) const
Emit a long directive and value.
This class is intended to be used as a base class for asm properties and features specific to the tar...
Definition: MCAsmInfo.h:56
virtual unsigned isStoreToStackSlotPostFE(const MachineInstr &MI, int &FrameIndex) const
Check for post-frame ptr elimination stack locations as well.
===- MachineOptimizationRemarkEmitter.h - Opt Diagnostics -*- C++ -*-—===//
MCSection * getTLSExtraDataSection() const
bool isOSWindows() const
Tests whether the OS is Windows.
Definition: Triple.h:562
bool useStatepoints() const
Returns true if this strategy is expecting the use of gc.statepoints, and false otherwise.
Definition: GCStrategy.h:118
bool isFloatTy() const
Return true if this is &#39;float&#39;, a 32-bit IEEE fp type.
Definition: Type.h:147
ExternalWeak linkage description.
Definition: GlobalValue.h:58
virtual MCSection * getNonexecutableStackSection(MCContext &Ctx) const
Targets can implement this method to specify a section to switch to if the translation unit doesn&#39;t h...
Definition: MCAsmInfo.h:414
static bool emitDebugValueComment(const MachineInstr *MI, AsmPrinter &AP)
emitDebugValueComment - This method handles the target-independent form of DBG_VALUE, returning true if it was able to do so.
Definition: AsmPrinter.cpp:830
IntegerType * getIntPtrType(LLVMContext &C, unsigned AddressSpace=0) const
Returns an integer type with size at least as big as that of a pointer in the given address space...
Definition: DataLayout.cpp:702
unsigned getPreferredAlignmentLog(const GlobalVariable *GV) const
Returns the preferred alignment of the specified global, returned in log form.
Definition: DataLayout.cpp:784
#define P(N)
.data_region jt32
Definition: MCDirectives.h:60
Same, but only replaced by something equivalent.
Definition: GlobalValue.h:52
EK_GPRel64BlockAddress - Each entry is an address of block, encoded with a relocation as gp-relative...
initializer< Ty > init(const Ty &Val)
Definition: CommandLine.h:406
void EmitZeros(uint64_t NumBytes)
Emit NumBytes worth of zeros.
Definition: MCStreamer.cpp:180
Streaming machine code generation interface.
Definition: MCStreamer.h:169
virtual void EmitFunctionBodyEnd()
Targets can override this to emit stuff after the last basic block in the function.
Definition: AsmPrinter.h:372
static const char *const EHTimerDescription
Definition: AsmPrinter.cpp:132
MCSymbol * createTempSymbol(bool CanBeUnnamed=true)
Create and return a new assembler temporary symbol with a unique but unspecified name.
Definition: MCContext.cpp:215
EK_Custom32 - Each entry is a 32-bit value that is custom lowered by the TargetLowering::LowerCustomJ...
CodeGenOpt::Level getOptLevel() const
Returns the optimization level: None, Less, Default, or Aggressive.
.weak_def_can_be_hidden (MachO)
Definition: MCDirectives.h:45
VisibilityTypes getVisibility() const
Definition: GlobalValue.h:225
MCSymbol * CurrentFnSym
The symbol for the current function.
Definition: AsmPrinter.h:105
bool getAsmPrinterFlag(CommentFlag Flag) const
Return whether an AsmPrinter flag is set.
Definition: MachineInstr.h:160
LLVM Basic Block Representation.
Definition: BasicBlock.h:59
const FunctionListType & getFunctionList() const
Get the Module&#39;s list of functions (constant).
Definition: Module.h:507
const MCAsmInfo * MAI
Target Asm Printer information.
Definition: AsmPrinter.h:83
The instances of the Type class are immutable: once they are created, they are never changed...
Definition: Type.h:46
const TargetSubtargetInfo & getSubtarget() const
getSubtarget - Return the subtarget for which this machine code is being compiled.
virtual bool shouldPutJumpTableInFunctionSection(bool UsesLabelDifference, const Function &F) const
void takeDeletedSymbolsForFunction(const Function *F, std::vector< MCSymbol *> &Result)
If the specified function has had any references to address-taken blocks generated, but the block got deleted, return the symbol now so we can emit it.
void getAnalysisUsage(AnalysisUsage &AU) const override
getAnalysisUsage - Subclasses that override getAnalysisUsage must call this.
bool isOSBinFormatCOFF() const
Tests whether the OS uses the COFF binary format.
Definition: Triple.h:593
.tvos_version_min
Definition: MCDirectives.h:67
AsmPrinter(TargetMachine &TM, std::unique_ptr< MCStreamer > Streamer)
Definition: AsmPrinter.cpp:179
MachineFrameInfo & getFrameInfo()
getFrameInfo - Return the frame info object for the current function.
bool needsLocalForSize() const
Definition: MCAsmInfo.h:474
static GCRegistry::Add< CoreCLRGC > E("coreclr", "CoreCLR-compatible GC")
This is an important base class in LLVM.
Definition: Constant.h:42
bool hasEHFunclets() const
unsigned getPointerSize(unsigned AS=0) const
Layout pointer size FIXME: The defaults need to be removed once all of the backends/clients are updat...
Definition: DataLayout.cpp:605
LLVM_ATTRIBUTE_ALWAYS_INLINE iterator begin()
Definition: SmallVector.h:116
This file contains the declarations for the subclasses of Constant, which represent the different fla...
MCSymbol * getAddrLabelSymbol(const BasicBlock *BB)
Return the symbol to be used for the specified basic block when its address is taken.
virtual MCSection * getSectionForConstant(const DataLayout &DL, SectionKind Kind, const Constant *C, unsigned &Align) const
Given a constant with the SectionKind, return a section that it should be placed in.
ConstantFP - Floating Point Values [float, double].
Definition: Constants.h:264
virtual bool isBlockOnlyReachableByFallthrough(const MachineBasicBlock *MBB) const
Return true if the basic block has exactly one predecessor and the control transfer mechanism between...
std::pair< iterator, bool > insert(PtrType Ptr)
Inserts Ptr if and only if there is no element in the container equal to Ptr.
Definition: SmallPtrSet.h:371
virtual void emitModuleMetadata(MCStreamer &Streamer, Module &M, const TargetMachine &TM) const
Emit the module-level metadata that the platform cares about.
MCSymbol * getSymbol(const GlobalValue *GV) const
static const MCBinaryExpr * createOr(const MCExpr *LHS, const MCExpr *RHS, MCContext &Ctx)
Definition: MCExpr.h:508
unsigned getAlignment() const
Return alignment of the basic block.
double convertToDouble() const
Definition: APFloat.h:1097
TargetMachine & TM
Target machine description.
Definition: AsmPrinter.h:80
This class is intended to be used as a driving class for all asm writers.
Definition: AsmPrinter.h:77
bool isCImm() const
isCImm - Test if this is a MO_CImmediate operand.
void getNameWithPrefix(SmallVectorImpl< char > &Name, const GlobalValue *GV) const
Definition: AsmPrinter.cpp:428
EHPersonality classifyEHPersonality(const Value *Pers)
See if the given exception handling personality function is one that we understand.
MCSymbol * getSymbolWithGlobalValueBase(const GlobalValue *GV, StringRef Suffix, const TargetMachine &TM) const
Return the MCSymbol for a private symbol with global value name as its base, with the specified suffi...
Represent the analysis usage information of a pass.
This file declares a class to represent arbitrary precision floating point values and provide a varie...
const MCSymbolRefExpr * getSymA() const
Definition: MCValue.h:48
bool optForSize() const
Optimize this function for size (-Os) or minimum size (-Oz).
Definition: Function.h:530
void getWatchOSVersion(unsigned &Major, unsigned &Minor, unsigned &Micro) const
getWatchOSVersion - Parse the version number as with getOSVersion.
Definition: Triple.cpp:1091
bool hasWeakDefCanBeHiddenDirective() const
Definition: MCAsmInfo.h:532
static bool isDiscardableIfUnused(LinkageTypes Linkage)
Whether the definition of this global may be discarded if it is not used in its compilation unit...
Definition: GlobalValue.h:352
MCSymbol * getJTISymbol(unsigned JTI, MCContext &Ctx, bool isLinkerPrivate=false) const
getJTISymbol - Return the MCSymbol for the specified non-empty jump table.
SectionKind - This is a simple POD value that classifies the properties of a section.
Definition: SectionKind.h:23
LCOMM::LCOMMType getLCOMMDirectiveAlignmentType() const
Definition: MCAsmInfo.h:518
const Triple & getTargetTriple() const
bool useAssignmentForEHBegin() const
Definition: MCAsmInfo.h:473
op_range operands()
Definition: User.h:222
bool hasLinkerPrivateGlobalPrefix() const
Definition: DataLayout.h:259
static void PrintChildLoopComment(raw_ostream &OS, const MachineLoop *Loop, unsigned FunctionNumber)
PrintChildLoopComment - Print comments about child loops within the loop for this basic block...
self_iterator getIterator()
Definition: ilist_node.h:82
~AsmPrinter() override
Definition: AsmPrinter.cpp:185
Ty & getObjFileInfo()
Keep track of various per-function pieces of information for backends that would like to do so...
Constant Vector Declarations.
Definition: Constants.h:491
MachineConstantPool * getConstantPool()
getConstantPool - Return the constant pool object for the current function.
bool hasSubsectionsViaSymbols() const
Definition: MCAsmInfo.h:396
void emitFrameAlloc(const MachineInstr &MI)
Definition: AsmPrinter.cpp:957
.weak_reference (MachO)
Definition: MCDirectives.h:44
bool isOSBinFormatMachO() const
Tests whether the environment is MachO.
Definition: Triple.h:598
void computeGlobalGOTEquivs(Module &M)
Unnamed constant global variables solely contaning a pointer to another globals variable act like a g...
const Target & getTarget() const
static const char *const EHTimerName
Definition: AsmPrinter.cpp:131
bool hasWeakDefDirective() const
Definition: MCAsmInfo.h:530
bool isSplat(unsigned SplatSizeInBits) const
Check if the APInt consists of a repeated bit pattern.
Definition: APInt.cpp:501
bool hasAddressTaken() const
Test whether this block is potentially the target of an indirect branch.
const Value * stripPointerCasts() const
Strip off pointer casts, all-zero GEPs, and aliases.
Definition: Value.cpp:558
Abstract base class for all machine specific constantpool value subclasses.
static void emitGlobalConstantVector(const DataLayout &DL, const ConstantVector *CV, AsmPrinter &AP)
auto find(R &&Range, const T &Val) -> decltype(adl_begin(Range))
Provide wrappers to std::find which take ranges instead of having to pass begin/end explicitly...
Definition: STLExtras.h:834
virtual MCSymbol * GetCPISymbol(unsigned CPID) const
Return the symbol for the specified constant pool entry.
unsigned getOSMajorVersion() const
getOSMajorVersion - Return just the major version number, this is specialized because it is a common ...
Definition: Triple.h:327
unsigned getDwarfVersion() const
Returns the Dwarf Version by checking module flags.
Definition: Module.cpp:453
virtual void markFunctionEnd()
bool isThreadBSS() const
Definition: SectionKind.h:153
void printAsOperand(raw_ostream &O, bool PrintType=true, const Module *M=nullptr) const
Print the name of this Value out to the specified raw_ostream.
Definition: AsmWriter.cpp:3573
std::string & str()
Flushes the stream contents to the target string and returns the string&#39;s reference.
Definition: raw_ostream.h:478
#define llvm_unreachable(msg)
Marks that the current location is not supposed to be reachable.
Windows x64, Windows Itanium (IA-64)
StringRef OperationEncodingString(unsigned Encoding)
Definition: Dwarf.cpp:138
static void PrintParentLoopComment(raw_ostream &OS, const MachineLoop *Loop, unsigned FunctionNumber)
PrintParentLoopComment - Print comments about parent loops of this one.
const DIExpression * getDebugExpression() const
Return the complex address expression referenced by this DBG_VALUE instruction.
Triple - Helper class for working with autoconf configuration names.
Definition: Triple.h:44
EH_LABEL - Represents a label in mid basic block used to track locations needed for debug and excepti...
Definition: ISDOpcodes.h:639
iterator_range< expr_op_iterator > expr_ops() const
bool hasWeakLinkage() const
Definition: GlobalValue.h:421
bool isBSS() const
Definition: SectionKind.h:160
const std::vector< MachineConstantPoolEntry > & getConstants() const
const APFloat & getValueAPF() const
Definition: Constants.h:294
bool hasAddressTaken() const
Returns true if there are any uses of this basic block other than direct branches, switches, etc.
Definition: BasicBlock.h:376
unsigned getFunctionNumber() const
Return a unique ID for the current function.
Definition: AsmPrinter.cpp:201
const std::vector< LandingPadInfo > & getLandingPads() const
Return a reference to the landing pad info for the current function.
unsigned getNumOperands() const
Definition: User.h:176
void emitCFIInstruction(const MachineInstr &MI)
Definition: AsmPrinter.cpp:932
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:799
MCSymbol * GetBlockAddressSymbol(const BlockAddress *BA) const
Return the MCSymbol used to satisfy BlockAddress uses of the specified basic block.
ConstMIBundleOperands - Iterate over all operands in a const bundle of machine instructions.
SmallPtrSet - This class implements a set which is optimized for holding SmallSize or less elements...
Definition: SmallPtrSet.h:418
virtual const MCExpr * lowerRelativeReference(const GlobalValue *LHS, const GlobalValue *RHS, const TargetMachine &TM) const
uint64_t getLimitedValue(uint64_t Limit=~0ULL) const
getLimitedValue - If the value is smaller than the specified limit, return it, otherwise return the l...
Definition: Constants.h:251
This is the shared class of boolean and integer constants.
Definition: Constants.h:84
static iterator begin()
virtual bool hasLoadFromStackSlot(const MachineInstr &MI, const MachineMemOperand *&MMO, int &FrameIndex) const
If the specified machine instruction has a load from a stack slot, return true along with the FrameIn...
virtual TargetLoweringObjectFile * getObjFileLowering() const
SymbolListTy GetGVStubList()
Accessor methods to return the set of stubs in sorted order.
MapVector< const MCSymbol *, GOTEquivUsePair > GlobalGOTEquivs
Definition: AsmPrinter.h:115
mmo_iterator memoperands_begin() const
Access to memory operands of the instruction.
Definition: MachineInstr.h:389
bool getMacOSXVersion(unsigned &Major, unsigned &Minor, unsigned &Micro) const
getMacOSXVersion - Parse the version number as with getOSVersion and then translate generic "darwin" ...
Definition: Triple.cpp:1024
virtual const MCExpr * getIndirectSymViaGOTPCRel(const MCSymbol *Sym, const MCValue &MV, int64_t Offset, MachineModuleInfo *MMI, MCStreamer &Streamer) const
Get the target specific PC relative GOT entry relocation.
virtual bool isVirtualSection() const =0
Check whether this section is "virtual", that is has no actual object file contents.
static const char *const CodeViewLineTablesGroupDescription
Definition: AsmPrinter.cpp:134
MCSymbol * getSymbol(const GlobalValue *GV) const
Definition: AsmPrinter.cpp:433
const MCSymbol & getSymbol() const
Definition: MCExpr.h:318
virtual const MCExpr * lowerConstant(const Constant *CV)
Lower the specified LLVM Constant to an MCExpr.
virtual void EmitInstruction(const MachineInstr *)
Targets should implement this to emit instructions.
Definition: AsmPrinter.h:384
bool isUndefined(bool SetUsed=true) const
isUndefined - Check if this symbol undefined (i.e., implicitly defined).
Definition: MCSymbol.h:260
MachineOperand class - Representation of each machine instruction operand.
bool isCommon() const
Definition: SectionKind.h:164
This is a &#39;vector&#39; (really, a variable-sized array), optimized for the case when the array is small...
Definition: SmallVector.h:864
Keep one copy of function when linking (inline)
Definition: GlobalValue.h:51
uint64_t getElementAsInteger(unsigned i) const
If this is a sequential container of integers (of any size), return the specified element in the low ...
Definition: Constants.cpp:2564
StringRef getAsString() const
If this array is isString(), then this method returns the array as a StringRef.
Definition: Constants.h:647
Module.h This file contains the declarations for the Module class.
void beginModule()
Emit all Dwarf sections that should come prior to the content.
Definition: DwarfDebug.cpp:571
Information about stack frame layout on the target.
const DataFlowGraph & G
Definition: RDFGraph.cpp:211
void EmitToStreamer(MCStreamer &S, const MCInst &Inst)
Definition: AsmPrinter.cpp:222
bool EmitSpecialLLVMGlobal(const GlobalVariable *GV)
Check to see if the specified global is a special global used by LLVM.
static SectionKind getReadOnlyWithRel()
Definition: SectionKind.h:203
uint64_t getSizeInBytes() const
Definition: DataLayout.h:499
StringRef str()
Return a StringRef for the vector contents.
Definition: raw_ostream.h:514
bool usesMetadata() const
If set, appropriate metadata tables must be emitted by the back-end (assembler, JIT, or otherwise).
Definition: GCStrategy.h:162
bool hasGlobalUnnamedAddr() const
Definition: GlobalValue.h:192
MCSymbolAttr
Definition: MCDirectives.h:19
void print(raw_ostream &OS, bool isSigned) const
Definition: APInt.cpp:2133
int64_t getImm() const
unsigned pred_size() const
bool isLayoutSuccessor(const MachineBasicBlock *MBB) const
Return true if the specified MBB will be emitted immediately after this block, such that if this bloc...
DWARF expression.
Collects and handles line tables information in a CodeView format.
Definition: CodeViewDebug.h:52
bool needsUnwindTableEntry() const
True if this function needs an unwind table.
Definition: Function.h:505
unsigned Log2_32(uint32_t Value)
Return the floor log base 2 of the specified value, -1 if the value is zero.
Definition: MathExtras.h:531
This file contains constants used for implementing Dwarf debug support.
Class for arbitrary precision integers.
Definition: APInt.h:69
ConstantArray - Constant Array Declarations.
Definition: Constants.h:405
static StringRef dropLLVMManglingEscape(StringRef Name)
If the given string begins with the GlobalValue name mangling escape character &#39;\1&#39;, drop it.
Definition: GlobalValue.h:462
virtual void EmitFunctionBodyStart()
Targets can override this to emit stuff before the first basic block in the function.
Definition: AsmPrinter.h:368
MCSymbol * getCurExceptionSym()
virtual bool hasStoreToStackSlot(const MachineInstr &MI, const MachineMemOperand *&MMO, int &FrameIndex) const
If the specified machine instruction has a store to a stack slot, return true along with the FrameInd...
LinkageTypes
An enumeration for the kinds of linkage for global values.
Definition: GlobalValue.h:48
unsigned getEntrySize(const DataLayout &TD) const
getEntrySize - Return the size of each entry in the jump table.
unsigned EmulatedTLS
EmulatedTLS - This flag enables emulated TLS model, using emutls function in the runtime library...
void setPreservesAll()
Set by analyses that do not transform their input at all.
iterator_range< user_iterator > users()
Definition: Value.h:401
unsigned getNumElements() const
ArrayType * getType() const
Specialize the getType() method to always return an ArrayType, which reduces the amount of casting ne...
Definition: Constants.h:424
MCSubtargetInfo * createMCSubtargetInfo(StringRef TheTriple, StringRef CPU, StringRef Features) const
createMCSubtargetInfo - Create a MCSubtargetInfo implementation.
FunctionNumber(functionNumber)
Definition: LLParser.cpp:2568
iterator end() const
Definition: GCMetadata.h:197
const MachineBasicBlock * getParent() const
Definition: MachineInstr.h:139
MachineModuleInfoELF - This is a MachineModuleInfoImpl implementation for ELF targets.
TargetSubtargetInfo - Generic base class for all target subtargets.
Iterators for registry entries.
Definition: Registry.h:84
virtual void EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV)
const uint64_t * getRawData() const
This function returns a pointer to the internal storage of the APInt.
Definition: APInt.h:668
uint64_t getTypeAllocSize(Type *Ty) const
Returns the offset in bytes between successive objects of the specified type, including alignment pad...
Definition: DataLayout.h:403
LoopT * getParentLoop() const
Definition: LoopInfo.h:101
const std::vector< LoopT * > & getSubLoops() const
Return the loops contained entirely within this loop.
Definition: LoopInfo.h:131
Representation of each machine instruction.
Definition: MachineInstr.h:59
static void emitGlobalConstantImpl(const DataLayout &DL, const Constant *C, AsmPrinter &AP, const Constant *BaseCV=nullptr, uint64_t Offset=0)
LLVM_ATTRIBUTE_ALWAYS_INLINE iterator end()
Definition: SmallVector.h:120
bool doInitialization(Module &M) override
Set up the AsmPrinter when we are working on a new module.
Definition: AsmPrinter.cpp:240
GCStrategy describes a garbage collector algorithm&#39;s code generation requirements, and provides overridable hooks for those needs which cannot be abstractly described.
Definition: GCStrategy.h:80
void SetupMachineFunction(MachineFunction &MF)
This should be called when a new MachineFunction is being processed from runOnMachineFunction.
bool isFunctionTy() const
True if this is an instance of FunctionType.
Definition: Type.h:212
MCSymbol * GetJTISymbol(unsigned JTID, bool isLinkerPrivate=false) const
Return the symbol for the specified jump table entry.
virtual unsigned isLoadFromStackSlotPostFE(const MachineInstr &MI, int &FrameIndex) const
Check for post-frame ptr elimination stack locations as well.
uint64_t getElementOffset(unsigned Idx) const
Definition: DataLayout.h:513
SequentialType * getType() const
Specialize the getType() method to always return a SequentialType, which reduces the amount of castin...
Definition: Constants.h:624
StringRef filename(StringRef path, Style style=Style::native)
Get filename.
Definition: Path.cpp:575
.type _foo,
Definition: MCDirectives.h:30
MCSymbol * getOrCreateSymbol(const Twine &Name)
Lookup the symbol inside with the specified Name.
Definition: MCContext.cpp:121
iterator begin() const
begin/end - Iterators for used strategies.
Definition: GCMetadata.h:196
void print(raw_ostream &O, bool IsForDebug=false, bool NoDetails=false) const
Print the current type.
Definition: AsmWriter.cpp:3468
bool isEHPad() const
Returns true if the block is a landing pad.
LLVM_NODISCARD bool empty() const
Definition: SmallVector.h:61
Represents a single loop in the control flow graph.
Definition: LoopInfo.h:439
bool isPositionIndependent() const
bool isEHFuncletEntry() const
Returns true if this is the entry block of an EH funclet.
virtual void EmitBasicBlockStart(const MachineBasicBlock &MBB) const
Targets can override this to emit stuff at the start of a basic block.
VectorType * getType() const
Specialize the getType() method to always return a VectorType, which reduces the amount of casting ne...
Definition: Constants.h:513
.type _foo, STT_FUNC # aka
Definition: MCDirectives.h:23
MCSymbol * GetJTSetSymbol(unsigned UID, unsigned MBBID) const
Return the symbol for the specified jump table .set FIXME: privatize to AsmPrinter.
StringRef getName() const
Return a constant reference to the value&#39;s name.
Definition: Value.cpp:220
TargetOptions Options
Definition: TargetMachine.h:96
virtual ~AsmPrinterHandler()
Pin vtable to this file.
const NodeList & List
Definition: RDFGraph.cpp:210
MCSymbol * getSymbol() const
Return the MCSymbol for this basic block.
static unsigned getNumGlobalVariableUses(const Constant *C)
Compute the number of Global Variables that uses a Constant.
#define I(x, y, z)
Definition: MD5.cpp:58
#define N
bool hasInlineAsm() const
Returns true if the function contains any inline assembly.
bool isDefined(bool SetUsed=true) const
isDefined - Check if this symbol is defined (i.e., it has an address).
Definition: MCSymbol.h:249
virtual const TargetFrameLowering * getFrameLowering() const
bool isFI() const
isFI - Tests if this is a MO_FrameIndex operand.
MCSubtargetInfo - Generic base class for all target subtargets.
SectionKind getSectionKind(const DataLayout *DL) const
const BasicBlock * getBasicBlock() const
Return the LLVM basic block that this instance corresponded to originally.
static gcp_map_type & getGCMap(void *&P)
Definition: AsmPrinter.cpp:147
static const MCBinaryExpr * createMod(const MCExpr *LHS, const MCExpr *RHS, MCContext &Ctx)
Definition: MCExpr.h:493
void EmitLabelDifference(const MCSymbol *Hi, const MCSymbol *Lo, unsigned Size) const
Emit something like ".long Hi-Lo" where the size in bytes of the directive is specified by Size and H...
LLVM_NODISCARD std::enable_if<!is_simple_type< Y >::value, typename cast_retty< X, const Y >::ret_type >::type dyn_cast(const Y &Val)
Definition: Casting.h:323
std::string getSchedInfoStr(const MachineInstr &MI) const override
Returns string representation of scheduler comment.
bool hasAltEntry() const
Definition: MCAsmInfo.h:527
Keep one copy of named function when linking (weak)
Definition: GlobalValue.h:53
Rename collisions when linking (static functions).
Definition: GlobalValue.h:56
const Constant * getIndirectSymbol() const
.weak_definition (MachO)
Definition: MCDirectives.h:43
static unsigned getGVAlignmentLog2(const GlobalValue *GV, const DataLayout &DL, unsigned InBits=0)
getGVAlignmentLog2 - Return the alignment to use for the specified global value in log2 form...
Definition: AsmPrinter.cpp:156
virtual void EmitFunctionEntryLabel()
EmitFunctionEntryLabel - Emit the label that is the entrypoint for the function.
Definition: AsmPrinter.cpp:729
const Module * getModule() const
bool isReg() const
isReg - Tests if this is a MO_Register operand.
std::vector< std::pair< MCSymbol *, StubValueTy > > SymbolListTy
const std::string & getModuleInlineAsm() const
Get any module-scope inline assembly blocks.
Definition: Module.h:241
const GlobalObject * getBaseObject() const
Definition: Globals.cpp:256
bool isDeclaration() const
Return true if the primary definition of this global value is outside of the current translation unit...
Definition: Globals.cpp:201
bool empty() const
Definition: LoopInfo.h:146
StringRef getName() const
getName - Get the symbol name.
Definition: MCSymbol.h:203
const Function * getFunction() const
getFunction - Return the LLVM function that this machine code represents
unsigned getCodePointerSize() const
Get the code pointer size in bytes.
Definition: MCAsmInfo.h:382
const Function * getFunction() const
Definition: Function.h:134
assert(ImpDefSCC.getReg()==AMDGPU::SCC &&ImpDefSCC.isDef())
A raw_ostream that writes to an std::string.
Definition: raw_ostream.h:462
MCSectionELF * getELFSection(const Twine &Section, unsigned Type, unsigned Flags)
Definition: MCContext.h:379
bool isTvOS() const
Is this an Apple tvOS triple.
Definition: Triple.h:456
MCSymbol * getMCSymbol() const
void EmitGlobalConstant(const DataLayout &DL, const Constant *CV)
Print a general LLVM constant to the .s file.
MCVersionMinType
Definition: MCDirectives.h:64
Module * getParent()
Get the module that this global value is contained inside of...
Definition: GlobalValue.h:556
LLVM Value Representation.
Definition: Value.h:73
Constant * getPersonalityFn() const
Get the personality function associated with this function.
Definition: Function.cpp:1260
JTEntryKind getEntryKind() const
uint64_t getTypeStoreSize(Type *Ty) const
Returns the maximum number of bytes that may be overwritten by storing the specified type...
Definition: DataLayout.h:386
bool isThreadLocal() const
Definition: SectionKind.h:149
bool hasInitializer() const
Definitions have initializers, declarations don&#39;t.
constexpr char Size[]
Key for Kernel::Arg::Metadata::mSize.
MachineLoop * getLoopFor(const MachineBasicBlock *BB) const
Return the innermost loop that BB lives in.
ExceptionHandling
Windows CE ARM, PowerPC, SH3, SH4.
static const char *const DbgTimerName
Definition: AsmPrinter.cpp:129
#define LLVM_FALLTHROUGH
LLVM_FALLTHROUGH - Mark fallthrough cases in switch statements.
Definition: Compiler.h:235
const DILocalVariable * getDebugVariable() const
Return the debug variable referenced by this DBG_VALUE instruction.
ExceptionHandling getExceptionHandlingType() const
Definition: MCAsmInfo.h:554
Attribute getFnAttribute(Attribute::AttrKind Kind) const
Return the attribute for the given attribute kind.
Definition: Function.h:270
static iterator end()
Definition: Registry.h:100
This class implements an extremely fast bulk output stream that can only output to a stream...
Definition: raw_ostream.h:44
Primary interface to the complete machine description for the target machine.
Definition: TargetMachine.h:57
uint64_t getTypeAllocSizeInBits(Type *Ty) const
Returns the offset in bits between successive objects of the specified type, including alignment padd...
Definition: DataLayout.h:413
MCSymbol * CurrentFnSymForSize
The symbol used to represent the start of the current function for the purpose of calculating its siz...
Definition: AsmPrinter.h:110
void getNameWithPrefix(raw_ostream &OS, const GlobalValue *GV, bool CannotUsePrivateLabel) const
Print the appropriate prefix and the specified global variable&#39;s name.
Definition: Mangler.cpp:109
const DataLayout & getDataLayout() const
Return information about data layout.
Definition: AsmPrinter.cpp:209
Type * getElementType() const
Definition: DerivedTypes.h:360
GCMetadataPrinter - Emits GC metadata as assembly code.
bool isThreadLocal() const
If the value is "Thread Local", its value isn&#39;t shared by the threads.
Definition: GlobalValue.h:238
virtual MCSection * getSectionForJumpTable(const Function &F, const TargetMachine &TM) const
iterator_range< global_iterator > globals()
Definition: Module.h:561
IRTranslator LLVM IR MI
MachineOptimizationRemarkEmitter * ORE
Optimization remark emitter.
Definition: AsmPrinter.h:101
bool hasOneUse() const
Return true if there is exactly one user of this value.
Definition: Value.h:414
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:49
A single uniqued string.
Definition: Metadata.h:602
EK_GPRel32BlockAddress - Each entry is an address of block, encoded with a relocation as gp-relative...
APInt bitcastToAPInt() const
Definition: APFloat.h:1094
static SectionKind getKindForGlobal(const GlobalObject *GO, const TargetMachine &TM)
Classify the specified global variable into a set of target independent categories embodied in Sectio...
unsigned getNumElements() const
Return the number of elements in the array or vector.
Definition: Constants.cpp:2294
No exception support.
bool TimePassesIsEnabled
If the user specifies the -time-passes argument on an LLVM tool command line then the value of this b...
Definition: IRReader.cpp:26
bool isBigEndian() const
Definition: DataLayout.h:217
const MCSection * getCurrentSection() const
Return the current section we are emitting to.
Definition: AsmPrinter.cpp:227
static void emitComments(const MachineInstr &MI, raw_ostream &CommentOS, AsmPrinter *AP)
emitComments - Pretty-print comments for instructions.
Definition: AsmPrinter.cpp:745
unsigned getOpcode() const
Definition: MCInst.h:172
MCSymbol * getSymbolWithGlobalValueBase(const GlobalValue *GV, StringRef Suffix) const
Return the MCSymbol for a private symbol with global value name as its base, with the specified suffi...
DILocalScope * getScope() const
Get the local scope for this variable.
unsigned getNumOperands() const
Return number of MDNode operands.
Definition: Metadata.h:1073
void emit(int, MCStreamer *, const MCSymbol *) const
const MachineJumpTableInfo * getJumpTableInfo() const
getJumpTableInfo - Return the jump table info object for the current function.
const MachineOperand & getOperand(unsigned i) const
Definition: MachineInstr.h:295
const ConstantInt * getCImm() const
bool isDoubleTy() const
Return true if this is &#39;double&#39;, a 64-bit IEEE fp type.
Definition: Type.h:150
bool isNoOpWithoutInvoke(EHPersonality Pers)
Return true if this personality may be safely removed if there are no invoke instructions remaining i...
MCSymbolAttr getHiddenDeclarationVisibilityAttr() const
Definition: MCAsmInfo.h:540
static SectionKind getReadOnly()
Definition: SectionKind.h:182
MCSymbol * createTempSymbol(const Twine &Name) const
MCSymbolAttr getProtectedVisibilityAttr() const
Definition: MCAsmInfo.h:544
StructType * getType() const
Specialization - reduce amount of casting.
Definition: Constants.h:478
const uint64_t Version
Definition: InstrProf.h:867
bool use_empty() const
Definition: Value.h:328
#define OP(n)
Definition: regex2.h:73
virtual const MCExpr * getPICJumpTableRelocBaseExpr(const MachineFunction *MF, unsigned JTI, MCContext &Ctx) const
This returns the relocation base for the given PIC jumptable, the same as getPICJumpTableRelocBase, but as an MCExpr.
static const MCConstantExpr * create(int64_t Value, MCContext &Ctx)
Definition: MCExpr.cpp:159
Type * getElementType() const
Definition: DerivedTypes.h:486
PointerType * getType() const
Global values are always pointers.
Definition: GlobalValue.h:265
.end_data_region
Definition: MCDirectives.h:61
bool isSpillSlotObjectIndex(int ObjectIdx) const
Returns true if the specified index corresponds to a spill slot.
bool supportIndirectSymViaGOTPCRel() const
Target supports replacing a data "PC"-relative access to a symbol through another symbol...
User * user_back()
Definition: Value.h:387
This class contains meta information specific to a module.
This file describes how to lower LLVM code to machine code.
Type * getTypeAtIndex(const Value *V) const
Given an index value into the type, return the type of the element.
Definition: Type.cpp:517
bool isString(unsigned CharSize=8) const
This method returns true if this is an array of CharSize integers.
Definition: Constants.cpp:2653
MCSubtargetInfo & getSubtargetCopy(const MCSubtargetInfo &STI)
Definition: MCContext.cpp:525