LLVM  9.0.0svn
AsmPrinter.cpp
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1 //===- AsmPrinter.cpp - Common AsmPrinter code ----------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file implements the AsmPrinter class.
10 //
11 //===----------------------------------------------------------------------===//
12 
14 #include "CodeViewDebug.h"
15 #include "DwarfDebug.h"
16 #include "DwarfException.h"
17 #include "WasmException.h"
18 #include "WinCFGuard.h"
19 #include "WinException.h"
20 #include "llvm/ADT/APFloat.h"
21 #include "llvm/ADT/APInt.h"
22 #include "llvm/ADT/DenseMap.h"
23 #include "llvm/ADT/STLExtras.h"
24 #include "llvm/ADT/SmallPtrSet.h"
25 #include "llvm/ADT/SmallString.h"
26 #include "llvm/ADT/SmallVector.h"
27 #include "llvm/ADT/Statistic.h"
28 #include "llvm/ADT/StringRef.h"
29 #include "llvm/ADT/Triple.h"
30 #include "llvm/ADT/Twine.h"
34 #include "llvm/BinaryFormat/COFF.h"
36 #include "llvm/BinaryFormat/ELF.h"
56 #include "llvm/CodeGen/StackMaps.h"
62 #include "llvm/IR/BasicBlock.h"
63 #include "llvm/IR/Comdat.h"
64 #include "llvm/IR/Constant.h"
65 #include "llvm/IR/Constants.h"
66 #include "llvm/IR/DataLayout.h"
68 #include "llvm/IR/DerivedTypes.h"
69 #include "llvm/IR/Function.h"
70 #include "llvm/IR/GlobalAlias.h"
71 #include "llvm/IR/GlobalIFunc.h"
73 #include "llvm/IR/GlobalObject.h"
74 #include "llvm/IR/GlobalValue.h"
75 #include "llvm/IR/GlobalVariable.h"
76 #include "llvm/IR/Instruction.h"
77 #include "llvm/IR/Mangler.h"
78 #include "llvm/IR/Metadata.h"
79 #include "llvm/IR/Module.h"
80 #include "llvm/IR/Operator.h"
81 #include "llvm/IR/Type.h"
82 #include "llvm/IR/Value.h"
83 #include "llvm/MC/MCAsmInfo.h"
84 #include "llvm/MC/MCCodePadder.h"
85 #include "llvm/MC/MCContext.h"
86 #include "llvm/MC/MCDirectives.h"
87 #include "llvm/MC/MCDwarf.h"
88 #include "llvm/MC/MCExpr.h"
89 #include "llvm/MC/MCInst.h"
90 #include "llvm/MC/MCSection.h"
91 #include "llvm/MC/MCSectionCOFF.h"
92 #include "llvm/MC/MCSectionELF.h"
93 #include "llvm/MC/MCSectionMachO.h"
94 #include "llvm/MC/MCStreamer.h"
96 #include "llvm/MC/MCSymbol.h"
97 #include "llvm/MC/MCSymbolELF.h"
99 #include "llvm/MC/MCValue.h"
100 #include "llvm/MC/SectionKind.h"
101 #include "llvm/Pass.h"
102 #include "llvm/Support/Casting.h"
104 #include "llvm/Support/Compiler.h"
106 #include "llvm/Support/Format.h"
107 #include "llvm/Support/MathExtras.h"
108 #include "llvm/Support/Path.h"
110 #include "llvm/Support/Timer.h"
115 #include <algorithm>
116 #include <cassert>
117 #include <cinttypes>
118 #include <cstdint>
119 #include <iterator>
120 #include <limits>
121 #include <memory>
122 #include <string>
123 #include <utility>
124 #include <vector>
125 
126 using namespace llvm;
127 
128 #define DEBUG_TYPE "asm-printer"
129 
130 static const char *const DWARFGroupName = "dwarf";
131 static const char *const DWARFGroupDescription = "DWARF Emission";
132 static const char *const DbgTimerName = "emit";
133 static const char *const DbgTimerDescription = "Debug Info Emission";
134 static const char *const EHTimerName = "write_exception";
135 static const char *const EHTimerDescription = "DWARF Exception Writer";
136 static const char *const CFGuardName = "Control Flow Guard";
137 static const char *const CFGuardDescription = "Control Flow Guard Tables";
138 static const char *const CodeViewLineTablesGroupName = "linetables";
139 static const char *const CodeViewLineTablesGroupDescription =
140  "CodeView Line Tables";
141 
142 STATISTIC(EmittedInsts, "Number of machine instrs printed");
143 
144 char AsmPrinter::ID = 0;
145 
147 
148 static gcp_map_type &getGCMap(void *&P) {
149  if (!P)
150  P = new gcp_map_type();
151  return *(gcp_map_type*)P;
152 }
153 
154 /// getGVAlignmentLog2 - Return the alignment to use for the specified global
155 /// value in log2 form. This rounds up to the preferred alignment if possible
156 /// and legal.
157 static unsigned getGVAlignmentLog2(const GlobalValue *GV, const DataLayout &DL,
158  unsigned InBits = 0) {
159  unsigned NumBits = 0;
160  if (const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV))
161  NumBits = DL.getPreferredAlignmentLog(GVar);
162 
163  // If InBits is specified, round it to it.
164  if (InBits > NumBits)
165  NumBits = InBits;
166 
167  // If the GV has a specified alignment, take it into account.
168  if (GV->getAlignment() == 0)
169  return NumBits;
170 
171  unsigned GVAlign = Log2_32(GV->getAlignment());
172 
173  // If the GVAlign is larger than NumBits, or if we are required to obey
174  // NumBits because the GV has an assigned section, obey it.
175  if (GVAlign > NumBits || GV->hasSection())
176  NumBits = GVAlign;
177  return NumBits;
178 }
179 
180 AsmPrinter::AsmPrinter(TargetMachine &tm, std::unique_ptr<MCStreamer> Streamer)
181  : MachineFunctionPass(ID), TM(tm), MAI(tm.getMCAsmInfo()),
182  OutContext(Streamer->getContext()), OutStreamer(std::move(Streamer)) {
183  VerboseAsm = OutStreamer->isVerboseAsm();
184 }
185 
187  assert(!DD && Handlers.empty() && "Debug/EH info didn't get finalized");
188 
189  if (GCMetadataPrinters) {
190  gcp_map_type &GCMap = getGCMap(GCMetadataPrinters);
191 
192  delete &GCMap;
193  GCMetadataPrinters = nullptr;
194  }
195 }
196 
198  return TM.isPositionIndependent();
199 }
200 
201 /// getFunctionNumber - Return a unique ID for the current function.
203  return MF->getFunctionNumber();
204 }
205 
207  return *TM.getObjFileLowering();
208 }
209 
211  return MMI->getModule()->getDataLayout();
212 }
213 
214 // Do not use the cached DataLayout because some client use it without a Module
215 // (dsymutil, llvm-dwarfdump).
216 unsigned AsmPrinter::getPointerSize() const {
217  return TM.getPointerSize(0); // FIXME: Default address space
218 }
219 
221  assert(MF && "getSubtargetInfo requires a valid MachineFunction!");
222  return MF->getSubtarget<MCSubtargetInfo>();
223 }
224 
227 }
228 
230  assert(DD && "Dwarf debug file is not defined.");
231  assert(OutStreamer->hasRawTextSupport() && "Expected assembly output mode.");
232  (void)DD->emitInitialLocDirective(MF, /*CUID=*/0);
233 }
234 
235 /// getCurrentSection() - Return the current section we are emitting to.
237  return OutStreamer->getCurrentSectionOnly();
238 }
239 
241  AU.setPreservesAll();
246 }
247 
249  MMI = getAnalysisIfAvailable<MachineModuleInfo>();
250 
251  // Initialize TargetLoweringObjectFile.
253  .Initialize(OutContext, TM);
254 
255  OutStreamer->InitSections(false);
256 
257  // Emit the version-min deployment target directive if needed.
258  //
259  // FIXME: If we end up with a collection of these sorts of Darwin-specific
260  // or ELF-specific things, it may make sense to have a platform helper class
261  // that will work with the target helper class. For now keep it here, as the
262  // alternative is duplicated code in each of the target asm printers that
263  // use the directive, where it would need the same conditionalization
264  // anyway.
265  const Triple &Target = TM.getTargetTriple();
266  OutStreamer->EmitVersionForTarget(Target, M.getSDKVersion());
267 
268  // Allow the target to emit any magic that it wants at the start of the file.
270 
271  // Very minimal debug info. It is ignored if we emit actual debug info. If we
272  // don't, this at least helps the user find where a global came from.
274  // .file "foo.c"
275  OutStreamer->EmitFileDirective(
277  }
278 
279  GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
280  assert(MI && "AsmPrinter didn't require GCModuleInfo?");
281  for (auto &I : *MI)
282  if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I))
283  MP->beginAssembly(M, *MI, *this);
284 
285  // Emit module-level inline asm if it exists.
286  if (!M.getModuleInlineAsm().empty()) {
287  // We're at the module level. Construct MCSubtarget from the default CPU
288  // and target triple.
289  std::unique_ptr<MCSubtargetInfo> STI(TM.getTarget().createMCSubtargetInfo(
292  OutStreamer->AddComment("Start of file scope inline assembly");
293  OutStreamer->AddBlankLine();
294  EmitInlineAsm(M.getModuleInlineAsm()+"\n",
296  OutStreamer->AddComment("End of file scope inline assembly");
297  OutStreamer->AddBlankLine();
298  }
299 
301  bool EmitCodeView = MMI->getModule()->getCodeViewFlag();
302  if (EmitCodeView && TM.getTargetTriple().isOSWindows()) {
303  Handlers.push_back(HandlerInfo(new CodeViewDebug(this),
304  DbgTimerName, DbgTimerDescription,
305  CodeViewLineTablesGroupName,
306  CodeViewLineTablesGroupDescription));
307  }
308  if (!EmitCodeView || MMI->getModule()->getDwarfVersion()) {
309  DD = new DwarfDebug(this, &M);
310  DD->beginModule();
311  Handlers.push_back(HandlerInfo(DD, DbgTimerName, DbgTimerDescription,
312  DWARFGroupName, DWARFGroupDescription));
313  }
314  }
315 
316  switch (MAI->getExceptionHandlingType()) {
320  isCFIMoveForDebugging = true;
322  break;
323  for (auto &F: M.getFunctionList()) {
324  // If the module contains any function with unwind data,
325  // .eh_frame has to be emitted.
326  // Ignore functions that won't get emitted.
327  if (!F.isDeclarationForLinker() && F.needsUnwindTableEntry()) {
328  isCFIMoveForDebugging = false;
329  break;
330  }
331  }
332  break;
333  default:
334  isCFIMoveForDebugging = false;
335  break;
336  }
337 
338  EHStreamer *ES = nullptr;
339  switch (MAI->getExceptionHandlingType()) {
341  break;
344  ES = new DwarfCFIException(this);
345  break;
347  ES = new ARMException(this);
348  break;
350  switch (MAI->getWinEHEncodingType()) {
351  default: llvm_unreachable("unsupported unwinding information encoding");
353  break;
356  ES = new WinException(this);
357  break;
358  }
359  break;
361  ES = new WasmException(this);
362  break;
363  }
364  if (ES)
365  Handlers.push_back(HandlerInfo(ES, EHTimerName, EHTimerDescription,
366  DWARFGroupName, DWARFGroupDescription));
367 
368  if (mdconst::extract_or_null<ConstantInt>(
369  MMI->getModule()->getModuleFlag("cfguardtable")))
370  Handlers.push_back(HandlerInfo(new WinCFGuard(this), CFGuardName,
371  CFGuardDescription, DWARFGroupName,
372  DWARFGroupDescription));
373 
374  return false;
375 }
376 
377 static bool canBeHidden(const GlobalValue *GV, const MCAsmInfo &MAI) {
379  return false;
380 
381  return GV->canBeOmittedFromSymbolTable();
382 }
383 
384 void AsmPrinter::EmitLinkage(const GlobalValue *GV, MCSymbol *GVSym) const {
385  GlobalValue::LinkageTypes Linkage = GV->getLinkage();
386  switch (Linkage) {
392  if (MAI->hasWeakDefDirective()) {
393  // .globl _foo
394  OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Global);
395 
396  if (!canBeHidden(GV, *MAI))
397  // .weak_definition _foo
398  OutStreamer->EmitSymbolAttribute(GVSym, MCSA_WeakDefinition);
399  else
400  OutStreamer->EmitSymbolAttribute(GVSym, MCSA_WeakDefAutoPrivate);
401  } else if (MAI->hasLinkOnceDirective()) {
402  // .globl _foo
403  OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Global);
404  //NOTE: linkonce is handled by the section the symbol was assigned to.
405  } else {
406  // .weak _foo
407  OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Weak);
408  }
409  return;
411  // If external, declare as a global symbol: .globl _foo
412  OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Global);
413  return;
416  return;
420  llvm_unreachable("Should never emit this");
421  }
422  llvm_unreachable("Unknown linkage type!");
423 }
424 
426  const GlobalValue *GV) const {
427  TM.getNameWithPrefix(Name, GV, getObjFileLowering().getMangler());
428 }
429 
431  return TM.getSymbol(GV);
432 }
433 
434 /// EmitGlobalVariable - Emit the specified global variable to the .s file.
436  bool IsEmuTLSVar = TM.useEmulatedTLS() && GV->isThreadLocal();
437  assert(!(IsEmuTLSVar && GV->hasCommonLinkage()) &&
438  "No emulated TLS variables in the common section");
439 
440  // Never emit TLS variable xyz in emulated TLS model.
441  // The initialization value is in __emutls_t.xyz instead of xyz.
442  if (IsEmuTLSVar)
443  return;
444 
445  if (GV->hasInitializer()) {
446  // Check to see if this is a special global used by LLVM, if so, emit it.
447  if (EmitSpecialLLVMGlobal(GV))
448  return;
449 
450  // Skip the emission of global equivalents. The symbol can be emitted later
451  // on by emitGlobalGOTEquivs in case it turns out to be needed.
452  if (GlobalGOTEquivs.count(getSymbol(GV)))
453  return;
454 
455  if (isVerbose()) {
456  // When printing the control variable __emutls_v.*,
457  // we don't need to print the original TLS variable name.
458  GV->printAsOperand(OutStreamer->GetCommentOS(),
459  /*PrintType=*/false, GV->getParent());
460  OutStreamer->GetCommentOS() << '\n';
461  }
462  }
463 
464  MCSymbol *GVSym = getSymbol(GV);
465  MCSymbol *EmittedSym = GVSym;
466 
467  // getOrCreateEmuTLSControlSym only creates the symbol with name and default
468  // attributes.
469  // GV's or GVSym's attributes will be used for the EmittedSym.
470  EmitVisibility(EmittedSym, GV->getVisibility(), !GV->isDeclaration());
471 
472  if (!GV->hasInitializer()) // External globals require no extra code.
473  return;
474 
475  GVSym->redefineIfPossible();
476  if (GVSym->isDefined() || GVSym->isVariable())
477  report_fatal_error("symbol '" + Twine(GVSym->getName()) +
478  "' is already defined");
479 
481  OutStreamer->EmitSymbolAttribute(EmittedSym, MCSA_ELF_TypeObject);
482 
484 
485  const DataLayout &DL = GV->getParent()->getDataLayout();
486  uint64_t Size = DL.getTypeAllocSize(GV->getType()->getElementType());
487 
488  // If the alignment is specified, we *must* obey it. Overaligning a global
489  // with a specified alignment is a prompt way to break globals emitted to
490  // sections and expected to be contiguous (e.g. ObjC metadata).
491  unsigned AlignLog = getGVAlignmentLog2(GV, DL);
492 
493  for (const HandlerInfo &HI : Handlers) {
494  NamedRegionTimer T(HI.TimerName, HI.TimerDescription,
495  HI.TimerGroupName, HI.TimerGroupDescription,
497  HI.Handler->setSymbolSize(GVSym, Size);
498  }
499 
500  // Handle common symbols
501  if (GVKind.isCommon()) {
502  if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
503  unsigned Align = 1 << AlignLog;
505  Align = 0;
506 
507  // .comm _foo, 42, 4
508  OutStreamer->EmitCommonSymbol(GVSym, Size, Align);
509  return;
510  }
511 
512  // Determine to which section this global should be emitted.
513  MCSection *TheSection = getObjFileLowering().SectionForGlobal(GV, GVKind, TM);
514 
515  // If we have a bss global going to a section that supports the
516  // zerofill directive, do so here.
517  if (GVKind.isBSS() && MAI->hasMachoZeroFillDirective() &&
518  TheSection->isVirtualSection()) {
519  if (Size == 0)
520  Size = 1; // zerofill of 0 bytes is undefined.
521  unsigned Align = 1 << AlignLog;
522  EmitLinkage(GV, GVSym);
523  // .zerofill __DATA, __bss, _foo, 400, 5
524  OutStreamer->EmitZerofill(TheSection, GVSym, Size, Align);
525  return;
526  }
527 
528  // If this is a BSS local symbol and we are emitting in the BSS
529  // section use .lcomm/.comm directive.
530  if (GVKind.isBSSLocal() &&
531  getObjFileLowering().getBSSSection() == TheSection) {
532  if (Size == 0)
533  Size = 1; // .comm Foo, 0 is undefined, avoid it.
534  unsigned Align = 1 << AlignLog;
535 
536  // Use .lcomm only if it supports user-specified alignment.
537  // Otherwise, while it would still be correct to use .lcomm in some
538  // cases (e.g. when Align == 1), the external assembler might enfore
539  // some -unknown- default alignment behavior, which could cause
540  // spurious differences between external and integrated assembler.
541  // Prefer to simply fall back to .local / .comm in this case.
543  // .lcomm _foo, 42
544  OutStreamer->EmitLocalCommonSymbol(GVSym, Size, Align);
545  return;
546  }
547 
548  if (!getObjFileLowering().getCommDirectiveSupportsAlignment())
549  Align = 0;
550 
551  // .local _foo
552  OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Local);
553  // .comm _foo, 42, 4
554  OutStreamer->EmitCommonSymbol(GVSym, Size, Align);
555  return;
556  }
557 
558  // Handle thread local data for mach-o which requires us to output an
559  // additional structure of data and mangle the original symbol so that we
560  // can reference it later.
561  //
562  // TODO: This should become an "emit thread local global" method on TLOF.
563  // All of this macho specific stuff should be sunk down into TLOFMachO and
564  // stuff like "TLSExtraDataSection" should no longer be part of the parent
565  // TLOF class. This will also make it more obvious that stuff like
566  // MCStreamer::EmitTBSSSymbol is macho specific and only called from macho
567  // specific code.
568  if (GVKind.isThreadLocal() && MAI->hasMachoTBSSDirective()) {
569  // Emit the .tbss symbol
570  MCSymbol *MangSym =
571  OutContext.getOrCreateSymbol(GVSym->getName() + Twine("$tlv$init"));
572 
573  if (GVKind.isThreadBSS()) {
574  TheSection = getObjFileLowering().getTLSBSSSection();
575  OutStreamer->EmitTBSSSymbol(TheSection, MangSym, Size, 1 << AlignLog);
576  } else if (GVKind.isThreadData()) {
577  OutStreamer->SwitchSection(TheSection);
578 
579  EmitAlignment(AlignLog, GV);
580  OutStreamer->EmitLabel(MangSym);
581 
583  GV->getInitializer());
584  }
585 
586  OutStreamer->AddBlankLine();
587 
588  // Emit the variable struct for the runtime.
590 
591  OutStreamer->SwitchSection(TLVSect);
592  // Emit the linkage here.
593  EmitLinkage(GV, GVSym);
594  OutStreamer->EmitLabel(GVSym);
595 
596  // Three pointers in size:
597  // - __tlv_bootstrap - used to make sure support exists
598  // - spare pointer, used when mapped by the runtime
599  // - pointer to mangled symbol above with initializer
600  unsigned PtrSize = DL.getPointerTypeSize(GV->getType());
601  OutStreamer->EmitSymbolValue(GetExternalSymbolSymbol("_tlv_bootstrap"),
602  PtrSize);
603  OutStreamer->EmitIntValue(0, PtrSize);
604  OutStreamer->EmitSymbolValue(MangSym, PtrSize);
605 
606  OutStreamer->AddBlankLine();
607  return;
608  }
609 
610  MCSymbol *EmittedInitSym = GVSym;
611 
612  OutStreamer->SwitchSection(TheSection);
613 
614  EmitLinkage(GV, EmittedInitSym);
615  EmitAlignment(AlignLog, GV);
616 
617  OutStreamer->EmitLabel(EmittedInitSym);
618 
620 
622  // .size foo, 42
623  OutStreamer->emitELFSize(EmittedInitSym,
625 
626  OutStreamer->AddBlankLine();
627 }
628 
629 /// Emit the directive and value for debug thread local expression
630 ///
631 /// \p Value - The value to emit.
632 /// \p Size - The size of the integer (in bytes) to emit.
633 void AsmPrinter::EmitDebugValue(const MCExpr *Value, unsigned Size) const {
634  OutStreamer->EmitValue(Value, Size);
635 }
636 
637 /// EmitFunctionHeader - This method emits the header for the current
638 /// function.
639 void AsmPrinter::EmitFunctionHeader() {
640  const Function &F = MF->getFunction();
641 
642  if (isVerbose())
643  OutStreamer->GetCommentOS()
644  << "-- Begin function "
646 
647  // Print out constants referenced by the function
649 
650  // Print the 'header' of function.
651  OutStreamer->SwitchSection(getObjFileLowering().SectionForGlobal(&F, TM));
652  EmitVisibility(CurrentFnSym, F.getVisibility());
653 
654  EmitLinkage(&F, CurrentFnSym);
655  if (MAI->hasFunctionAlignment())
657 
659  OutStreamer->EmitSymbolAttribute(CurrentFnSym, MCSA_ELF_TypeFunction);
660 
662  OutStreamer->EmitSymbolAttribute(CurrentFnSym, MCSA_Cold);
663 
664  if (isVerbose()) {
665  F.printAsOperand(OutStreamer->GetCommentOS(),
666  /*PrintType=*/false, F.getParent());
667  OutStreamer->GetCommentOS() << '\n';
668  }
669 
670  // Emit the prefix data.
671  if (F.hasPrefixData()) {
672  if (MAI->hasSubsectionsViaSymbols()) {
673  // Preserving prefix data on platforms which use subsections-via-symbols
674  // is a bit tricky. Here we introduce a symbol for the prefix data
675  // and use the .alt_entry attribute to mark the function's real entry point
676  // as an alternative entry point to the prefix-data symbol.
678  OutStreamer->EmitLabel(PrefixSym);
679 
681 
682  // Emit an .alt_entry directive for the actual function symbol.
683  OutStreamer->EmitSymbolAttribute(CurrentFnSym, MCSA_AltEntry);
684  } else {
686  }
687  }
688 
689  // Emit the CurrentFnSym. This is a virtual function to allow targets to
690  // do their wild and crazy things as required.
692 
693  // If the function had address-taken blocks that got deleted, then we have
694  // references to the dangling symbols. Emit them at the start of the function
695  // so that we don't get references to undefined symbols.
696  std::vector<MCSymbol*> DeadBlockSyms;
697  MMI->takeDeletedSymbolsForFunction(&F, DeadBlockSyms);
698  for (unsigned i = 0, e = DeadBlockSyms.size(); i != e; ++i) {
699  OutStreamer->AddComment("Address taken block that was later removed");
700  OutStreamer->EmitLabel(DeadBlockSyms[i]);
701  }
702 
703  if (CurrentFnBegin) {
704  if (MAI->useAssignmentForEHBegin()) {
706  OutStreamer->EmitLabel(CurPos);
707  OutStreamer->EmitAssignment(CurrentFnBegin,
709  } else {
710  OutStreamer->EmitLabel(CurrentFnBegin);
711  }
712  }
713 
714  // Emit pre-function debug and/or EH information.
715  for (const HandlerInfo &HI : Handlers) {
716  NamedRegionTimer T(HI.TimerName, HI.TimerDescription, HI.TimerGroupName,
717  HI.TimerGroupDescription, TimePassesIsEnabled);
718  HI.Handler->beginFunction(MF);
719  }
720 
721  // Emit the prologue data.
722  if (F.hasPrologueData())
724 }
725 
726 /// EmitFunctionEntryLabel - Emit the label that is the entrypoint for the
727 /// function. This can be overridden by targets as required to do custom stuff.
730 
731  // The function label could have already been emitted if two symbols end up
732  // conflicting due to asm renaming. Detect this and emit an error.
733  if (CurrentFnSym->isVariable())
735  "' is a protected alias");
736  if (CurrentFnSym->isDefined())
738  "' label emitted multiple times to assembly file");
739 
740  return OutStreamer->EmitLabel(CurrentFnSym);
741 }
742 
743 /// emitComments - Pretty-print comments for instructions.
744 static void emitComments(const MachineInstr &MI, raw_ostream &CommentOS) {
745  const MachineFunction *MF = MI.getMF();
746  const TargetInstrInfo *TII = MF->getSubtarget().getInstrInfo();
747 
748  // Check for spills and reloads
749 
750  // We assume a single instruction only has a spill or reload, not
751  // both.
753  if ((Size = MI.getRestoreSize(TII))) {
754  CommentOS << *Size << "-byte Reload\n";
755  } else if ((Size = MI.getFoldedRestoreSize(TII))) {
756  if (*Size)
757  CommentOS << *Size << "-byte Folded Reload\n";
758  } else if ((Size = MI.getSpillSize(TII))) {
759  CommentOS << *Size << "-byte Spill\n";
760  } else if ((Size = MI.getFoldedSpillSize(TII))) {
761  if (*Size)
762  CommentOS << *Size << "-byte Folded Spill\n";
763  }
764 
765  // Check for spill-induced copies
767  CommentOS << " Reload Reuse\n";
768 }
769 
770 /// emitImplicitDef - This method emits the specified machine instruction
771 /// that is an implicit def.
773  unsigned RegNo = MI->getOperand(0).getReg();
774 
775  SmallString<128> Str;
776  raw_svector_ostream OS(Str);
777  OS << "implicit-def: "
778  << printReg(RegNo, MF->getSubtarget().getRegisterInfo());
779 
780  OutStreamer->AddComment(OS.str());
781  OutStreamer->AddBlankLine();
782 }
783 
784 static void emitKill(const MachineInstr *MI, AsmPrinter &AP) {
785  std::string Str;
786  raw_string_ostream OS(Str);
787  OS << "kill:";
788  for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
789  const MachineOperand &Op = MI->getOperand(i);
790  assert(Op.isReg() && "KILL instruction must have only register operands");
791  OS << ' ' << (Op.isDef() ? "def " : "killed ")
792  << printReg(Op.getReg(), AP.MF->getSubtarget().getRegisterInfo());
793  }
794  AP.OutStreamer->AddComment(OS.str());
795  AP.OutStreamer->AddBlankLine();
796 }
797 
798 /// emitDebugValueComment - This method handles the target-independent form
799 /// of DBG_VALUE, returning true if it was able to do so. A false return
800 /// means the target will need to handle MI in EmitInstruction.
802  // This code handles only the 4-operand target-independent form.
803  if (MI->getNumOperands() != 4)
804  return false;
805 
806  SmallString<128> Str;
807  raw_svector_ostream OS(Str);
808  OS << "DEBUG_VALUE: ";
809 
810  const DILocalVariable *V = MI->getDebugVariable();
811  if (auto *SP = dyn_cast<DISubprogram>(V->getScope())) {
812  StringRef Name = SP->getName();
813  if (!Name.empty())
814  OS << Name << ":";
815  }
816  OS << V->getName();
817  OS << " <- ";
818 
819  // The second operand is only an offset if it's an immediate.
820  bool MemLoc = MI->getOperand(0).isReg() && MI->getOperand(1).isImm();
821  int64_t Offset = MemLoc ? MI->getOperand(1).getImm() : 0;
822  const DIExpression *Expr = MI->getDebugExpression();
823  if (Expr->getNumElements()) {
824  OS << '[';
825  bool NeedSep = false;
826  for (auto Op : Expr->expr_ops()) {
827  if (NeedSep)
828  OS << ", ";
829  else
830  NeedSep = true;
831  OS << dwarf::OperationEncodingString(Op.getOp());
832  for (unsigned I = 0; I < Op.getNumArgs(); ++I)
833  OS << ' ' << Op.getArg(I);
834  }
835  OS << "] ";
836  }
837 
838  // Register or immediate value. Register 0 means undef.
839  if (MI->getOperand(0).isFPImm()) {
840  APFloat APF = APFloat(MI->getOperand(0).getFPImm()->getValueAPF());
841  if (MI->getOperand(0).getFPImm()->getType()->isFloatTy()) {
842  OS << (double)APF.convertToFloat();
843  } else if (MI->getOperand(0).getFPImm()->getType()->isDoubleTy()) {
844  OS << APF.convertToDouble();
845  } else {
846  // There is no good way to print long double. Convert a copy to
847  // double. Ah well, it's only a comment.
848  bool ignored;
850  &ignored);
851  OS << "(long double) " << APF.convertToDouble();
852  }
853  } else if (MI->getOperand(0).isImm()) {
854  OS << MI->getOperand(0).getImm();
855  } else if (MI->getOperand(0).isCImm()) {
856  MI->getOperand(0).getCImm()->getValue().print(OS, false /*isSigned*/);
857  } else {
858  unsigned Reg;
859  if (MI->getOperand(0).isReg()) {
860  Reg = MI->getOperand(0).getReg();
861  } else {
862  assert(MI->getOperand(0).isFI() && "Unknown operand type");
864  Offset += TFI->getFrameIndexReference(*AP.MF,
865  MI->getOperand(0).getIndex(), Reg);
866  MemLoc = true;
867  }
868  if (Reg == 0) {
869  // Suppress offset, it is not meaningful here.
870  OS << "undef";
871  // NOTE: Want this comment at start of line, don't emit with AddComment.
872  AP.OutStreamer->emitRawComment(OS.str());
873  return true;
874  }
875  if (MemLoc)
876  OS << '[';
877  OS << printReg(Reg, AP.MF->getSubtarget().getRegisterInfo());
878  }
879 
880  if (MemLoc)
881  OS << '+' << Offset << ']';
882 
883  // NOTE: Want this comment at start of line, don't emit with AddComment.
884  AP.OutStreamer->emitRawComment(OS.str());
885  return true;
886 }
887 
888 /// This method handles the target-independent form of DBG_LABEL, returning
889 /// true if it was able to do so. A false return means the target will need
890 /// to handle MI in EmitInstruction.
892  if (MI->getNumOperands() != 1)
893  return false;
894 
895  SmallString<128> Str;
896  raw_svector_ostream OS(Str);
897  OS << "DEBUG_LABEL: ";
898 
899  const DILabel *V = MI->getDebugLabel();
900  if (auto *SP = dyn_cast<DISubprogram>(V->getScope())) {
901  StringRef Name = SP->getName();
902  if (!Name.empty())
903  OS << Name << ":";
904  }
905  OS << V->getName();
906 
907  // NOTE: Want this comment at start of line, don't emit with AddComment.
908  AP.OutStreamer->emitRawComment(OS.str());
909  return true;
910 }
911 
915  return CFI_M_EH;
916 
917  if (MMI->hasDebugInfo())
918  return CFI_M_Debug;
919 
920  return CFI_M_None;
921 }
922 
925 }
926 
928  ExceptionHandling ExceptionHandlingType = MAI->getExceptionHandlingType();
929  if (ExceptionHandlingType != ExceptionHandling::DwarfCFI &&
930  ExceptionHandlingType != ExceptionHandling::ARM)
931  return;
932 
933  if (needsCFIMoves() == CFI_M_None)
934  return;
935 
936  // If there is no "real" instruction following this CFI instruction, skip
937  // emitting it; it would be beyond the end of the function's FDE range.
938  auto *MBB = MI.getParent();
939  auto I = std::next(MI.getIterator());
940  while (I != MBB->end() && I->isTransient())
941  ++I;
942  if (I == MBB->instr_end() &&
943  MBB->getReverseIterator() == MBB->getParent()->rbegin())
944  return;
945 
946  const std::vector<MCCFIInstruction> &Instrs = MF->getFrameInstructions();
947  unsigned CFIIndex = MI.getOperand(0).getCFIIndex();
948  const MCCFIInstruction &CFI = Instrs[CFIIndex];
949  emitCFIInstruction(CFI);
950 }
951 
953  // The operands are the MCSymbol and the frame offset of the allocation.
954  MCSymbol *FrameAllocSym = MI.getOperand(0).getMCSymbol();
955  int FrameOffset = MI.getOperand(1).getImm();
956 
957  // Emit a symbol assignment.
958  OutStreamer->EmitAssignment(FrameAllocSym,
959  MCConstantExpr::create(FrameOffset, OutContext));
960 }
961 
964  return;
965 
966  MCSection *StackSizeSection =
968  if (!StackSizeSection)
969  return;
970 
971  const MachineFrameInfo &FrameInfo = MF.getFrameInfo();
972  // Don't emit functions with dynamic stack allocations.
973  if (FrameInfo.hasVarSizedObjects())
974  return;
975 
976  OutStreamer->PushSection();
977  OutStreamer->SwitchSection(StackSizeSection);
978 
979  const MCSymbol *FunctionSymbol = getFunctionBegin();
980  uint64_t StackSize = FrameInfo.getStackSize();
981  OutStreamer->EmitSymbolValue(FunctionSymbol, TM.getProgramPointerSize());
982  OutStreamer->EmitULEB128IntValue(StackSize);
983 
984  OutStreamer->PopSection();
985 }
986 
989  if (!MF.getLandingPads().empty() || MF.hasEHFunclets() || MMI->hasDebugInfo())
990  return true;
991 
992  // We might emit an EH table that uses function begin and end labels even if
993  // we don't have any landingpads.
994  if (!MF.getFunction().hasPersonalityFn())
995  return false;
996  return !isNoOpWithoutInvoke(
998 }
999 
1000 /// EmitFunctionBody - This method emits the body and trailer for a
1001 /// function.
1003  EmitFunctionHeader();
1004 
1005  // Emit target-specific gunk before the function body.
1007 
1008  bool ShouldPrintDebugScopes = MMI->hasDebugInfo();
1009 
1010  if (isVerbose()) {
1011  // Get MachineDominatorTree or compute it on the fly if it's unavailable
1012  MDT = getAnalysisIfAvailable<MachineDominatorTree>();
1013  if (!MDT) {
1014  OwnedMDT = make_unique<MachineDominatorTree>();
1015  OwnedMDT->getBase().recalculate(*MF);
1016  MDT = OwnedMDT.get();
1017  }
1018 
1019  // Get MachineLoopInfo or compute it on the fly if it's unavailable
1020  MLI = getAnalysisIfAvailable<MachineLoopInfo>();
1021  if (!MLI) {
1022  OwnedMLI = make_unique<MachineLoopInfo>();
1023  OwnedMLI->getBase().analyze(MDT->getBase());
1024  MLI = OwnedMLI.get();
1025  }
1026  }
1027 
1028  // Print out code for the function.
1029  bool HasAnyRealCode = false;
1030  int NumInstsInFunction = 0;
1031  for (auto &MBB : *MF) {
1032  // Print a label for the basic block.
1033  EmitBasicBlockStart(MBB);
1034  for (auto &MI : MBB) {
1035  // Print the assembly for the instruction.
1036  if (!MI.isPosition() && !MI.isImplicitDef() && !MI.isKill() &&
1037  !MI.isDebugInstr()) {
1038  HasAnyRealCode = true;
1039  ++NumInstsInFunction;
1040  }
1041 
1042  // If there is a pre-instruction symbol, emit a label for it here.
1043  if (MCSymbol *S = MI.getPreInstrSymbol())
1044  OutStreamer->EmitLabel(S);
1045 
1046  if (ShouldPrintDebugScopes) {
1047  for (const HandlerInfo &HI : Handlers) {
1048  NamedRegionTimer T(HI.TimerName, HI.TimerDescription,
1049  HI.TimerGroupName, HI.TimerGroupDescription,
1051  HI.Handler->beginInstruction(&MI);
1052  }
1053  }
1054 
1055  if (isVerbose())
1056  emitComments(MI, OutStreamer->GetCommentOS());
1057 
1058  switch (MI.getOpcode()) {
1059  case TargetOpcode::CFI_INSTRUCTION:
1061  break;
1062  case TargetOpcode::LOCAL_ESCAPE:
1063  emitFrameAlloc(MI);
1064  break;
1066  case TargetOpcode::GC_LABEL:
1067  OutStreamer->EmitLabel(MI.getOperand(0).getMCSymbol());
1068  break;
1071  EmitInlineAsm(&MI);
1072  break;
1073  case TargetOpcode::DBG_VALUE:
1074  if (isVerbose()) {
1075  if (!emitDebugValueComment(&MI, *this))
1076  EmitInstruction(&MI);
1077  }
1078  break;
1079  case TargetOpcode::DBG_LABEL:
1080  if (isVerbose()) {
1081  if (!emitDebugLabelComment(&MI, *this))
1082  EmitInstruction(&MI);
1083  }
1084  break;
1085  case TargetOpcode::IMPLICIT_DEF:
1086  if (isVerbose()) emitImplicitDef(&MI);
1087  break;
1088  case TargetOpcode::KILL:
1089  if (isVerbose()) emitKill(&MI, *this);
1090  break;
1091  default:
1092  EmitInstruction(&MI);
1093  break;
1094  }
1095 
1096  // If there is a post-instruction symbol, emit a label for it here.
1097  if (MCSymbol *S = MI.getPostInstrSymbol())
1098  OutStreamer->EmitLabel(S);
1099 
1100  if (ShouldPrintDebugScopes) {
1101  for (const HandlerInfo &HI : Handlers) {
1102  NamedRegionTimer T(HI.TimerName, HI.TimerDescription,
1103  HI.TimerGroupName, HI.TimerGroupDescription,
1105  HI.Handler->endInstruction();
1106  }
1107  }
1108  }
1109 
1110  EmitBasicBlockEnd(MBB);
1111  }
1112 
1113  EmittedInsts += NumInstsInFunction;
1114  MachineOptimizationRemarkAnalysis R(DEBUG_TYPE, "InstructionCount",
1115  MF->getFunction().getSubprogram(),
1116  &MF->front());
1117  R << ore::NV("NumInstructions", NumInstsInFunction)
1118  << " instructions in function";
1119  ORE->emit(R);
1120 
1121  // If the function is empty and the object file uses .subsections_via_symbols,
1122  // then we need to emit *something* to the function body to prevent the
1123  // labels from collapsing together. Just emit a noop.
1124  // Similarly, don't emit empty functions on Windows either. It can lead to
1125  // duplicate entries (two functions with the same RVA) in the Guard CF Table
1126  // after linking, causing the kernel not to load the binary:
1127  // https://developercommunity.visualstudio.com/content/problem/45366/vc-linker-creates-invalid-dll-with-clang-cl.html
1128  // FIXME: Hide this behind some API in e.g. MCAsmInfo or MCTargetStreamer.
1129  const Triple &TT = TM.getTargetTriple();
1130  if (!HasAnyRealCode && (MAI->hasSubsectionsViaSymbols() ||
1131  (TT.isOSWindows() && TT.isOSBinFormatCOFF()))) {
1132  MCInst Noop;
1133  MF->getSubtarget().getInstrInfo()->getNoop(Noop);
1134 
1135  // Targets can opt-out of emitting the noop here by leaving the opcode
1136  // unspecified.
1137  if (Noop.getOpcode()) {
1138  OutStreamer->AddComment("avoids zero-length function");
1139  OutStreamer->EmitInstruction(Noop, getSubtargetInfo());
1140  }
1141  }
1142 
1143  const Function &F = MF->getFunction();
1144  for (const auto &BB : F) {
1145  if (!BB.hasAddressTaken())
1146  continue;
1147  MCSymbol *Sym = GetBlockAddressSymbol(&BB);
1148  if (Sym->isDefined())
1149  continue;
1150  OutStreamer->AddComment("Address of block that was removed by CodeGen");
1151  OutStreamer->EmitLabel(Sym);
1152  }
1153 
1154  // Emit target-specific gunk after the function body.
1156 
1157  if (needFuncLabelsForEHOrDebugInfo(*MF, MMI) ||
1159  // Create a symbol for the end of function.
1160  CurrentFnEnd = createTempSymbol("func_end");
1161  OutStreamer->EmitLabel(CurrentFnEnd);
1162  }
1163 
1164  // If the target wants a .size directive for the size of the function, emit
1165  // it.
1167  // We can get the size as difference between the function label and the
1168  // temp label.
1169  const MCExpr *SizeExp = MCBinaryExpr::createSub(
1170  MCSymbolRefExpr::create(CurrentFnEnd, OutContext),
1172  OutStreamer->emitELFSize(CurrentFnSym, SizeExp);
1173  }
1174 
1175  for (const HandlerInfo &HI : Handlers) {
1176  NamedRegionTimer T(HI.TimerName, HI.TimerDescription, HI.TimerGroupName,
1177  HI.TimerGroupDescription, TimePassesIsEnabled);
1178  HI.Handler->markFunctionEnd();
1179  }
1180 
1181  // Print out jump tables referenced by the function.
1183 
1184  // Emit post-function debug and/or EH information.
1185  for (const HandlerInfo &HI : Handlers) {
1186  NamedRegionTimer T(HI.TimerName, HI.TimerDescription, HI.TimerGroupName,
1187  HI.TimerGroupDescription, TimePassesIsEnabled);
1188  HI.Handler->endFunction(MF);
1189  }
1190 
1191  // Emit section containing stack size metadata.
1192  emitStackSizeSection(*MF);
1193 
1194  if (isVerbose())
1195  OutStreamer->GetCommentOS() << "-- End function\n";
1196 
1197  OutStreamer->AddBlankLine();
1198 }
1199 
1200 /// Compute the number of Global Variables that uses a Constant.
1201 static unsigned getNumGlobalVariableUses(const Constant *C) {
1202  if (!C)
1203  return 0;
1204 
1205  if (isa<GlobalVariable>(C))
1206  return 1;
1207 
1208  unsigned NumUses = 0;
1209  for (auto *CU : C->users())
1210  NumUses += getNumGlobalVariableUses(dyn_cast<Constant>(CU));
1211 
1212  return NumUses;
1213 }
1214 
1215 /// Only consider global GOT equivalents if at least one user is a
1216 /// cstexpr inside an initializer of another global variables. Also, don't
1217 /// handle cstexpr inside instructions. During global variable emission,
1218 /// candidates are skipped and are emitted later in case at least one cstexpr
1219 /// isn't replaced by a PC relative GOT entry access.
1221  unsigned &NumGOTEquivUsers) {
1222  // Global GOT equivalents are unnamed private globals with a constant
1223  // pointer initializer to another global symbol. They must point to a
1224  // GlobalVariable or Function, i.e., as GlobalValue.
1225  if (!GV->hasGlobalUnnamedAddr() || !GV->hasInitializer() ||
1226  !GV->isConstant() || !GV->isDiscardableIfUnused() ||
1227  !dyn_cast<GlobalValue>(GV->getOperand(0)))
1228  return false;
1229 
1230  // To be a got equivalent, at least one of its users need to be a constant
1231  // expression used by another global variable.
1232  for (auto *U : GV->users())
1233  NumGOTEquivUsers += getNumGlobalVariableUses(dyn_cast<Constant>(U));
1234 
1235  return NumGOTEquivUsers > 0;
1236 }
1237 
1238 /// Unnamed constant global variables solely contaning a pointer to
1239 /// another globals variable is equivalent to a GOT table entry; it contains the
1240 /// the address of another symbol. Optimize it and replace accesses to these
1241 /// "GOT equivalents" by using the GOT entry for the final global instead.
1242 /// Compute GOT equivalent candidates among all global variables to avoid
1243 /// emitting them if possible later on, after it use is replaced by a GOT entry
1244 /// access.
1246  if (!getObjFileLowering().supportIndirectSymViaGOTPCRel())
1247  return;
1248 
1249  for (const auto &G : M.globals()) {
1250  unsigned NumGOTEquivUsers = 0;
1251  if (!isGOTEquivalentCandidate(&G, NumGOTEquivUsers))
1252  continue;
1253 
1254  const MCSymbol *GOTEquivSym = getSymbol(&G);
1255  GlobalGOTEquivs[GOTEquivSym] = std::make_pair(&G, NumGOTEquivUsers);
1256  }
1257 }
1258 
1259 /// Constant expressions using GOT equivalent globals may not be eligible
1260 /// for PC relative GOT entry conversion, in such cases we need to emit such
1261 /// globals we previously omitted in EmitGlobalVariable.
1263  if (!getObjFileLowering().supportIndirectSymViaGOTPCRel())
1264  return;
1265 
1266  SmallVector<const GlobalVariable *, 8> FailedCandidates;
1267  for (auto &I : GlobalGOTEquivs) {
1268  const GlobalVariable *GV = I.second.first;
1269  unsigned Cnt = I.second.second;
1270  if (Cnt)
1271  FailedCandidates.push_back(GV);
1272  }
1273  GlobalGOTEquivs.clear();
1274 
1275  for (auto *GV : FailedCandidates)
1276  EmitGlobalVariable(GV);
1277 }
1278 
1279 void AsmPrinter::emitGlobalIndirectSymbol(Module &M,
1280  const GlobalIndirectSymbol& GIS) {
1281  MCSymbol *Name = getSymbol(&GIS);
1282 
1283  if (GIS.hasExternalLinkage() || !MAI->getWeakRefDirective())
1284  OutStreamer->EmitSymbolAttribute(Name, MCSA_Global);
1285  else if (GIS.hasWeakLinkage() || GIS.hasLinkOnceLinkage())
1286  OutStreamer->EmitSymbolAttribute(Name, MCSA_WeakReference);
1287  else
1288  assert(GIS.hasLocalLinkage() && "Invalid alias or ifunc linkage");
1289 
1290  bool IsFunction = GIS.getType()->getPointerElementType()->isFunctionTy();
1291 
1292  // Treat bitcasts of functions as functions also. This is important at least
1293  // on WebAssembly where object and function addresses can't alias each other.
1294  if (!IsFunction)
1295  if (auto *CE = dyn_cast<ConstantExpr>(GIS.getIndirectSymbol()))
1296  if (CE->getOpcode() == Instruction::BitCast)
1297  IsFunction =
1298  CE->getOperand(0)->getType()->getPointerElementType()->isFunctionTy();
1299 
1300  // Set the symbol type to function if the alias has a function type.
1301  // This affects codegen when the aliasee is not a function.
1302  if (IsFunction) {
1303  OutStreamer->EmitSymbolAttribute(Name, MCSA_ELF_TypeFunction);
1304  if (isa<GlobalIFunc>(GIS))
1305  OutStreamer->EmitSymbolAttribute(Name, MCSA_ELF_TypeIndFunction);
1306  }
1307 
1308  EmitVisibility(Name, GIS.getVisibility());
1309 
1310  const MCExpr *Expr = lowerConstant(GIS.getIndirectSymbol());
1311 
1312  if (isa<GlobalAlias>(&GIS) && MAI->hasAltEntry() && isa<MCBinaryExpr>(Expr))
1313  OutStreamer->EmitSymbolAttribute(Name, MCSA_AltEntry);
1314 
1315  // Emit the directives as assignments aka .set:
1316  OutStreamer->EmitAssignment(Name, Expr);
1317 
1318  if (auto *GA = dyn_cast<GlobalAlias>(&GIS)) {
1319  // If the aliasee does not correspond to a symbol in the output, i.e. the
1320  // alias is not of an object or the aliased object is private, then set the
1321  // size of the alias symbol from the type of the alias. We don't do this in
1322  // other situations as the alias and aliasee having differing types but same
1323  // size may be intentional.
1324  const GlobalObject *BaseObject = GA->getBaseObject();
1325  if (MAI->hasDotTypeDotSizeDirective() && GA->getValueType()->isSized() &&
1326  (!BaseObject || BaseObject->hasPrivateLinkage())) {
1327  const DataLayout &DL = M.getDataLayout();
1328  uint64_t Size = DL.getTypeAllocSize(GA->getValueType());
1329  OutStreamer->emitELFSize(Name, MCConstantExpr::create(Size, OutContext));
1330  }
1331  }
1332 }
1333 
1335  // Set the MachineFunction to nullptr so that we can catch attempted
1336  // accesses to MF specific features at the module level and so that
1337  // we can conditionalize accesses based on whether or not it is nullptr.
1338  MF = nullptr;
1339 
1340  // Gather all GOT equivalent globals in the module. We really need two
1341  // passes over the globals: one to compute and another to avoid its emission
1342  // in EmitGlobalVariable, otherwise we would not be able to handle cases
1343  // where the got equivalent shows up before its use.
1345 
1346  // Emit global variables.
1347  for (const auto &G : M.globals())
1349 
1350  // Emit remaining GOT equivalent globals.
1352 
1353  // Emit visibility info for declarations
1354  for (const Function &F : M) {
1355  if (!F.isDeclarationForLinker())
1356  continue;
1357  GlobalValue::VisibilityTypes V = F.getVisibility();
1359  continue;
1360 
1361  MCSymbol *Name = getSymbol(&F);
1362  EmitVisibility(Name, V, false);
1363  }
1364 
1366 
1367  TLOF.emitModuleMetadata(*OutStreamer, M);
1368 
1371 
1372  // Output stubs for external and common global variables.
1374  if (!Stubs.empty()) {
1375  OutStreamer->SwitchSection(TLOF.getDataSection());
1376  const DataLayout &DL = M.getDataLayout();
1377 
1379  for (const auto &Stub : Stubs) {
1380  OutStreamer->EmitLabel(Stub.first);
1381  OutStreamer->EmitSymbolValue(Stub.second.getPointer(),
1382  DL.getPointerSize());
1383  }
1384  }
1385  }
1386 
1388  MachineModuleInfoCOFF &MMICOFF =
1390 
1391  // Output stubs for external and common global variables.
1393  if (!Stubs.empty()) {
1394  const DataLayout &DL = M.getDataLayout();
1395 
1396  for (const auto &Stub : Stubs) {
1397  SmallString<256> SectionName = StringRef(".rdata$");
1398  SectionName += Stub.first->getName();
1399  OutStreamer->SwitchSection(OutContext.getCOFFSection(
1400  SectionName,
1403  SectionKind::getReadOnly(), Stub.first->getName(),
1406  OutStreamer->EmitSymbolAttribute(Stub.first, MCSA_Global);
1407  OutStreamer->EmitLabel(Stub.first);
1408  OutStreamer->EmitSymbolValue(Stub.second.getPointer(),
1409  DL.getPointerSize());
1410  }
1411  }
1412  }
1413 
1414  // Finalize debug and EH information.
1415  for (const HandlerInfo &HI : Handlers) {
1416  NamedRegionTimer T(HI.TimerName, HI.TimerDescription, HI.TimerGroupName,
1417  HI.TimerGroupDescription, TimePassesIsEnabled);
1418  HI.Handler->endModule();
1419  delete HI.Handler;
1420  }
1421  Handlers.clear();
1422  DD = nullptr;
1423 
1424  // If the target wants to know about weak references, print them all.
1425  if (MAI->getWeakRefDirective()) {
1426  // FIXME: This is not lazy, it would be nice to only print weak references
1427  // to stuff that is actually used. Note that doing so would require targets
1428  // to notice uses in operands (due to constant exprs etc). This should
1429  // happen with the MC stuff eventually.
1430 
1431  // Print out module-level global objects here.
1432  for (const auto &GO : M.global_objects()) {
1433  if (!GO.hasExternalWeakLinkage())
1434  continue;
1435  OutStreamer->EmitSymbolAttribute(getSymbol(&GO), MCSA_WeakReference);
1436  }
1437  }
1438 
1439  OutStreamer->AddBlankLine();
1440 
1441  // Print aliases in topological order, that is, for each alias a = b,
1442  // b must be printed before a.
1443  // This is because on some targets (e.g. PowerPC) linker expects aliases in
1444  // such an order to generate correct TOC information.
1447  for (const auto &Alias : M.aliases()) {
1448  for (const GlobalAlias *Cur = &Alias; Cur;
1449  Cur = dyn_cast<GlobalAlias>(Cur->getAliasee())) {
1450  if (!AliasVisited.insert(Cur).second)
1451  break;
1452  AliasStack.push_back(Cur);
1453  }
1454  for (const GlobalAlias *AncestorAlias : llvm::reverse(AliasStack))
1455  emitGlobalIndirectSymbol(M, *AncestorAlias);
1456  AliasStack.clear();
1457  }
1458  for (const auto &IFunc : M.ifuncs())
1459  emitGlobalIndirectSymbol(M, IFunc);
1460 
1461  GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
1462  assert(MI && "AsmPrinter didn't require GCModuleInfo?");
1463  for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; )
1464  if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(**--I))
1465  MP->finishAssembly(M, *MI, *this);
1466 
1467  // Emit llvm.ident metadata in an '.ident' directive.
1468  EmitModuleIdents(M);
1469 
1470  // Emit bytes for llvm.commandline metadata.
1471  EmitModuleCommandLines(M);
1472 
1473  // Emit __morestack address if needed for indirect calls.
1474  if (MMI->usesMorestackAddr()) {
1475  unsigned Align = 1;
1476  MCSection *ReadOnlySection = getObjFileLowering().getSectionForConstant(
1478  /*C=*/nullptr, Align);
1479  OutStreamer->SwitchSection(ReadOnlySection);
1480 
1481  MCSymbol *AddrSymbol =
1482  OutContext.getOrCreateSymbol(StringRef("__morestack_addr"));
1483  OutStreamer->EmitLabel(AddrSymbol);
1484 
1485  unsigned PtrSize = MAI->getCodePointerSize();
1486  OutStreamer->EmitSymbolValue(GetExternalSymbolSymbol("__morestack"),
1487  PtrSize);
1488  }
1489 
1490  // Emit .note.GNU-split-stack and .note.GNU-no-split-stack sections if
1491  // split-stack is used.
1493  OutStreamer->SwitchSection(
1494  OutContext.getELFSection(".note.GNU-split-stack", ELF::SHT_PROGBITS, 0));
1495  if (MMI->hasNosplitStack())
1496  OutStreamer->SwitchSection(
1497  OutContext.getELFSection(".note.GNU-no-split-stack", ELF::SHT_PROGBITS, 0));
1498  }
1499 
1500  // If we don't have any trampolines, then we don't require stack memory
1501  // to be executable. Some targets have a directive to declare this.
1502  Function *InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline");
1503  if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty())
1505  OutStreamer->SwitchSection(S);
1506 
1508  // Emit /EXPORT: flags for each exported global as necessary.
1509  const auto &TLOF = getObjFileLowering();
1510  std::string Flags;
1511 
1512  for (const GlobalValue &GV : M.global_values()) {
1513  raw_string_ostream OS(Flags);
1514  TLOF.emitLinkerFlagsForGlobal(OS, &GV);
1515  OS.flush();
1516  if (!Flags.empty()) {
1517  OutStreamer->SwitchSection(TLOF.getDrectveSection());
1518  OutStreamer->EmitBytes(Flags);
1519  }
1520  Flags.clear();
1521  }
1522 
1523  // Emit /INCLUDE: flags for each used global as necessary.
1524  if (const auto *LU = M.getNamedGlobal("llvm.used")) {
1525  assert(LU->hasInitializer() &&
1526  "expected llvm.used to have an initializer");
1527  assert(isa<ArrayType>(LU->getValueType()) &&
1528  "expected llvm.used to be an array type");
1529  if (const auto *A = cast<ConstantArray>(LU->getInitializer())) {
1530  for (const Value *Op : A->operands()) {
1531  const auto *GV =
1532  cast<GlobalValue>(Op->stripPointerCastsNoFollowAliases());
1533  // Global symbols with internal or private linkage are not visible to
1534  // the linker, and thus would cause an error when the linker tried to
1535  // preserve the symbol due to the `/include:` directive.
1536  if (GV->hasLocalLinkage())
1537  continue;
1538 
1539  raw_string_ostream OS(Flags);
1540  TLOF.emitLinkerFlagsForUsed(OS, GV);
1541  OS.flush();
1542 
1543  if (!Flags.empty()) {
1544  OutStreamer->SwitchSection(TLOF.getDrectveSection());
1545  OutStreamer->EmitBytes(Flags);
1546  }
1547  Flags.clear();
1548  }
1549  }
1550  }
1551  }
1552 
1553  if (TM.Options.EmitAddrsig) {
1554  // Emit address-significance attributes for all globals.
1555  OutStreamer->EmitAddrsig();
1556  for (const GlobalValue &GV : M.global_values())
1557  if (!GV.use_empty() && !GV.isThreadLocal() &&
1558  !GV.hasDLLImportStorageClass() && !GV.getName().startswith("llvm.") &&
1560  OutStreamer->EmitAddrsigSym(getSymbol(&GV));
1561  }
1562 
1563  // Allow the target to emit any magic that it wants at the end of the file,
1564  // after everything else has gone out.
1565  EmitEndOfAsmFile(M);
1566 
1567  MMI = nullptr;
1568 
1569  OutStreamer->Finish();
1570  OutStreamer->reset();
1571  OwnedMLI.reset();
1572  OwnedMDT.reset();
1573 
1574  return false;
1575 }
1576 
1578  if (!CurExceptionSym)
1579  CurExceptionSym = createTempSymbol("exception");
1580  return CurExceptionSym;
1581 }
1582 
1584  this->MF = &MF;
1585  // Get the function symbol.
1588  CurrentFnBegin = nullptr;
1589  CurExceptionSym = nullptr;
1590  bool NeedsLocalForSize = MAI->needsLocalForSize();
1591  if (needFuncLabelsForEHOrDebugInfo(MF, MMI) || NeedsLocalForSize ||
1593  CurrentFnBegin = createTempSymbol("func_begin");
1594  if (NeedsLocalForSize)
1595  CurrentFnSymForSize = CurrentFnBegin;
1596  }
1597 
1598  ORE = &getAnalysis<MachineOptimizationRemarkEmitterPass>().getORE();
1599 }
1600 
1601 namespace {
1602 
1603 // Keep track the alignment, constpool entries per Section.
1604  struct SectionCPs {
1605  MCSection *S;
1606  unsigned Alignment;
1608 
1609  SectionCPs(MCSection *s, unsigned a) : S(s), Alignment(a) {}
1610  };
1611 
1612 } // end anonymous namespace
1613 
1614 /// EmitConstantPool - Print to the current output stream assembly
1615 /// representations of the constants in the constant pool MCP. This is
1616 /// used to print out constants which have been "spilled to memory" by
1617 /// the code generator.
1619  const MachineConstantPool *MCP = MF->getConstantPool();
1620  const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
1621  if (CP.empty()) return;
1622 
1623  // Calculate sections for constant pool entries. We collect entries to go into
1624  // the same section together to reduce amount of section switch statements.
1625  SmallVector<SectionCPs, 4> CPSections;
1626  for (unsigned i = 0, e = CP.size(); i != e; ++i) {
1627  const MachineConstantPoolEntry &CPE = CP[i];
1628  unsigned Align = CPE.getAlignment();
1629 
1630  SectionKind Kind = CPE.getSectionKind(&getDataLayout());
1631 
1632  const Constant *C = nullptr;
1633  if (!CPE.isMachineConstantPoolEntry())
1634  C = CPE.Val.ConstVal;
1635 
1637  Kind, C, Align);
1638 
1639  // The number of sections are small, just do a linear search from the
1640  // last section to the first.
1641  bool Found = false;
1642  unsigned SecIdx = CPSections.size();
1643  while (SecIdx != 0) {
1644  if (CPSections[--SecIdx].S == S) {
1645  Found = true;
1646  break;
1647  }
1648  }
1649  if (!Found) {
1650  SecIdx = CPSections.size();
1651  CPSections.push_back(SectionCPs(S, Align));
1652  }
1653 
1654  if (Align > CPSections[SecIdx].Alignment)
1655  CPSections[SecIdx].Alignment = Align;
1656  CPSections[SecIdx].CPEs.push_back(i);
1657  }
1658 
1659  // Now print stuff into the calculated sections.
1660  const MCSection *CurSection = nullptr;
1661  unsigned Offset = 0;
1662  for (unsigned i = 0, e = CPSections.size(); i != e; ++i) {
1663  for (unsigned j = 0, ee = CPSections[i].CPEs.size(); j != ee; ++j) {
1664  unsigned CPI = CPSections[i].CPEs[j];
1665  MCSymbol *Sym = GetCPISymbol(CPI);
1666  if (!Sym->isUndefined())
1667  continue;
1668 
1669  if (CurSection != CPSections[i].S) {
1670  OutStreamer->SwitchSection(CPSections[i].S);
1671  EmitAlignment(Log2_32(CPSections[i].Alignment));
1672  CurSection = CPSections[i].S;
1673  Offset = 0;
1674  }
1675 
1676  MachineConstantPoolEntry CPE = CP[CPI];
1677 
1678  // Emit inter-object padding for alignment.
1679  unsigned AlignMask = CPE.getAlignment() - 1;
1680  unsigned NewOffset = (Offset + AlignMask) & ~AlignMask;
1681  OutStreamer->EmitZeros(NewOffset - Offset);
1682 
1683  Type *Ty = CPE.getType();
1684  Offset = NewOffset + getDataLayout().getTypeAllocSize(Ty);
1685 
1686  OutStreamer->EmitLabel(Sym);
1687  if (CPE.isMachineConstantPoolEntry())
1689  else
1691  }
1692  }
1693 }
1694 
1695 /// EmitJumpTableInfo - Print assembly representations of the jump tables used
1696 /// by the current function to the current output stream.
1698  const DataLayout &DL = MF->getDataLayout();
1699  const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo();
1700  if (!MJTI) return;
1701  if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_Inline) return;
1702  const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
1703  if (JT.empty()) return;
1704 
1705  // Pick the directive to use to print the jump table entries, and switch to
1706  // the appropriate section.
1707  const Function &F = MF->getFunction();
1709  bool JTInDiffSection = !TLOF.shouldPutJumpTableInFunctionSection(
1711  F);
1712  if (JTInDiffSection) {
1713  // Drop it in the readonly section.
1714  MCSection *ReadOnlySection = TLOF.getSectionForJumpTable(F, TM);
1715  OutStreamer->SwitchSection(ReadOnlySection);
1716  }
1717 
1719 
1720  // Jump tables in code sections are marked with a data_region directive
1721  // where that's supported.
1722  if (!JTInDiffSection)
1723  OutStreamer->EmitDataRegion(MCDR_DataRegionJT32);
1724 
1725  for (unsigned JTI = 0, e = JT.size(); JTI != e; ++JTI) {
1726  const std::vector<MachineBasicBlock*> &JTBBs = JT[JTI].MBBs;
1727 
1728  // If this jump table was deleted, ignore it.
1729  if (JTBBs.empty()) continue;
1730 
1731  // For the EK_LabelDifference32 entry, if using .set avoids a relocation,
1732  /// emit a .set directive for each unique entry.
1736  const TargetLowering *TLI = MF->getSubtarget().getTargetLowering();
1738  for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
1739  const MachineBasicBlock *MBB = JTBBs[ii];
1740  if (!EmittedSets.insert(MBB).second)
1741  continue;
1742 
1743  // .set LJTSet, LBB32-base
1744  const MCExpr *LHS =
1746  OutStreamer->EmitAssignment(GetJTSetSymbol(JTI, MBB->getNumber()),
1747  MCBinaryExpr::createSub(LHS, Base,
1748  OutContext));
1749  }
1750  }
1751 
1752  // On some targets (e.g. Darwin) we want to emit two consecutive labels
1753  // before each jump table. The first label is never referenced, but tells
1754  // the assembler and linker the extents of the jump table object. The
1755  // second label is actually referenced by the code.
1756  if (JTInDiffSection && DL.hasLinkerPrivateGlobalPrefix())
1757  // FIXME: This doesn't have to have any specific name, just any randomly
1758  // named and numbered 'l' label would work. Simplify GetJTISymbol.
1759  OutStreamer->EmitLabel(GetJTISymbol(JTI, true));
1760 
1761  OutStreamer->EmitLabel(GetJTISymbol(JTI));
1762 
1763  for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
1764  EmitJumpTableEntry(MJTI, JTBBs[ii], JTI);
1765  }
1766  if (!JTInDiffSection)
1767  OutStreamer->EmitDataRegion(MCDR_DataRegionEnd);
1768 }
1769 
1770 /// EmitJumpTableEntry - Emit a jump table entry for the specified MBB to the
1771 /// current stream.
1772 void AsmPrinter::EmitJumpTableEntry(const MachineJumpTableInfo *MJTI,
1773  const MachineBasicBlock *MBB,
1774  unsigned UID) const {
1775  assert(MBB && MBB->getNumber() >= 0 && "Invalid basic block");
1776  const MCExpr *Value = nullptr;
1777  switch (MJTI->getEntryKind()) {
1779  llvm_unreachable("Cannot emit EK_Inline jump table entry");
1782  MJTI, MBB, UID, OutContext);
1783  break;
1785  // EK_BlockAddress - Each entry is a plain address of block, e.g.:
1786  // .word LBB123
1787  Value = MCSymbolRefExpr::create(MBB->getSymbol(), OutContext);
1788  break;
1790  // EK_GPRel32BlockAddress - Each entry is an address of block, encoded
1791  // with a relocation as gp-relative, e.g.:
1792  // .gprel32 LBB123
1793  MCSymbol *MBBSym = MBB->getSymbol();
1794  OutStreamer->EmitGPRel32Value(MCSymbolRefExpr::create(MBBSym, OutContext));
1795  return;
1796  }
1797 
1799  // EK_GPRel64BlockAddress - Each entry is an address of block, encoded
1800  // with a relocation as gp-relative, e.g.:
1801  // .gpdword LBB123
1802  MCSymbol *MBBSym = MBB->getSymbol();
1803  OutStreamer->EmitGPRel64Value(MCSymbolRefExpr::create(MBBSym, OutContext));
1804  return;
1805  }
1806 
1808  // Each entry is the address of the block minus the address of the jump
1809  // table. This is used for PIC jump tables where gprel32 is not supported.
1810  // e.g.:
1811  // .word LBB123 - LJTI1_2
1812  // If the .set directive avoids relocations, this is emitted as:
1813  // .set L4_5_set_123, LBB123 - LJTI1_2
1814  // .word L4_5_set_123
1816  Value = MCSymbolRefExpr::create(GetJTSetSymbol(UID, MBB->getNumber()),
1817  OutContext);
1818  break;
1819  }
1820  Value = MCSymbolRefExpr::create(MBB->getSymbol(), OutContext);
1821  const TargetLowering *TLI = MF->getSubtarget().getTargetLowering();
1822  const MCExpr *Base = TLI->getPICJumpTableRelocBaseExpr(MF, UID, OutContext);
1823  Value = MCBinaryExpr::createSub(Value, Base, OutContext);
1824  break;
1825  }
1826  }
1827 
1828  assert(Value && "Unknown entry kind!");
1829 
1830  unsigned EntrySize = MJTI->getEntrySize(getDataLayout());
1831  OutStreamer->EmitValue(Value, EntrySize);
1832 }
1833 
1834 /// EmitSpecialLLVMGlobal - Check to see if the specified global is a
1835 /// special global used by LLVM. If so, emit it and return true, otherwise
1836 /// do nothing and return false.
1838  if (GV->getName() == "llvm.used") {
1839  if (MAI->hasNoDeadStrip()) // No need to emit this at all.
1840  EmitLLVMUsedList(cast<ConstantArray>(GV->getInitializer()));
1841  return true;
1842  }
1843 
1844  // Ignore debug and non-emitted data. This handles llvm.compiler.used.
1845  if (GV->getSection() == "llvm.metadata" ||
1847  return true;
1848 
1849  if (!GV->hasAppendingLinkage()) return false;
1850 
1851  assert(GV->hasInitializer() && "Not a special LLVM global!");
1852 
1853  if (GV->getName() == "llvm.global_ctors") {
1854  EmitXXStructorList(GV->getParent()->getDataLayout(), GV->getInitializer(),
1855  /* isCtor */ true);
1856 
1857  return true;
1858  }
1859 
1860  if (GV->getName() == "llvm.global_dtors") {
1861  EmitXXStructorList(GV->getParent()->getDataLayout(), GV->getInitializer(),
1862  /* isCtor */ false);
1863 
1864  return true;
1865  }
1866 
1867  report_fatal_error("unknown special variable");
1868 }
1869 
1870 /// EmitLLVMUsedList - For targets that define a MAI::UsedDirective, mark each
1871 /// global in the specified llvm.used list.
1872 void AsmPrinter::EmitLLVMUsedList(const ConstantArray *InitList) {
1873  // Should be an array of 'i8*'.
1874  for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
1875  const GlobalValue *GV =
1877  if (GV)
1878  OutStreamer->EmitSymbolAttribute(getSymbol(GV), MCSA_NoDeadStrip);
1879  }
1880 }
1881 
1882 namespace {
1883 
1884 struct Structor {
1885  int Priority = 0;
1886  Constant *Func = nullptr;
1887  GlobalValue *ComdatKey = nullptr;
1888 
1889  Structor() = default;
1890 };
1891 
1892 } // end anonymous namespace
1893 
1894 /// EmitXXStructorList - Emit the ctor or dtor list taking into account the init
1895 /// priority.
1896 void AsmPrinter::EmitXXStructorList(const DataLayout &DL, const Constant *List,
1897  bool isCtor) {
1898  // Should be an array of '{ int, void ()* }' structs. The first value is the
1899  // init priority.
1900  if (!isa<ConstantArray>(List)) return;
1901 
1902  // Sanity check the structors list.
1903  const ConstantArray *InitList = dyn_cast<ConstantArray>(List);
1904  if (!InitList) return; // Not an array!
1905  StructType *ETy = dyn_cast<StructType>(InitList->getType()->getElementType());
1906  // FIXME: Only allow the 3-field form in LLVM 4.0.
1907  if (!ETy || ETy->getNumElements() < 2 || ETy->getNumElements() > 3)
1908  return; // Not an array of two or three elements!
1909  if (!isa<IntegerType>(ETy->getTypeAtIndex(0U)) ||
1910  !isa<PointerType>(ETy->getTypeAtIndex(1U))) return; // Not (int, ptr).
1911  if (ETy->getNumElements() == 3 && !isa<PointerType>(ETy->getTypeAtIndex(2U)))
1912  return; // Not (int, ptr, ptr).
1913 
1914  // Gather the structors in a form that's convenient for sorting by priority.
1915  SmallVector<Structor, 8> Structors;
1916  for (Value *O : InitList->operands()) {
1918  if (!CS) continue; // Malformed.
1919  if (CS->getOperand(1)->isNullValue())
1920  break; // Found a null terminator, skip the rest.
1921  ConstantInt *Priority = dyn_cast<ConstantInt>(CS->getOperand(0));
1922  if (!Priority) continue; // Malformed.
1923  Structors.push_back(Structor());
1924  Structor &S = Structors.back();
1925  S.Priority = Priority->getLimitedValue(65535);
1926  S.Func = CS->getOperand(1);
1927  if (ETy->getNumElements() == 3 && !CS->getOperand(2)->isNullValue())
1928  S.ComdatKey =
1929  dyn_cast<GlobalValue>(CS->getOperand(2)->stripPointerCasts());
1930  }
1931 
1932  // Emit the function pointers in the target-specific order
1933  unsigned Align = Log2_32(DL.getPointerPrefAlignment());
1934  std::stable_sort(Structors.begin(), Structors.end(),
1935  [](const Structor &L,
1936  const Structor &R) { return L.Priority < R.Priority; });
1937  for (Structor &S : Structors) {
1939  const MCSymbol *KeySym = nullptr;
1940  if (GlobalValue *GV = S.ComdatKey) {
1941  if (GV->isDeclarationForLinker())
1942  // If the associated variable is not defined in this module
1943  // (it might be available_externally, or have been an
1944  // available_externally definition that was dropped by the
1945  // EliminateAvailableExternally pass), some other TU
1946  // will provide its dynamic initializer.
1947  continue;
1948 
1949  KeySym = getSymbol(GV);
1950  }
1951  MCSection *OutputSection =
1952  (isCtor ? Obj.getStaticCtorSection(S.Priority, KeySym)
1953  : Obj.getStaticDtorSection(S.Priority, KeySym));
1954  OutStreamer->SwitchSection(OutputSection);
1955  if (OutStreamer->getCurrentSection() != OutStreamer->getPreviousSection())
1956  EmitAlignment(Align);
1957  EmitXXStructor(DL, S.Func);
1958  }
1959 }
1960 
1961 void AsmPrinter::EmitModuleIdents(Module &M) {
1962  if (!MAI->hasIdentDirective())
1963  return;
1964 
1965  if (const NamedMDNode *NMD = M.getNamedMetadata("llvm.ident")) {
1966  for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) {
1967  const MDNode *N = NMD->getOperand(i);
1968  assert(N->getNumOperands() == 1 &&
1969  "llvm.ident metadata entry can have only one operand");
1970  const MDString *S = cast<MDString>(N->getOperand(0));
1971  OutStreamer->EmitIdent(S->getString());
1972  }
1973  }
1974 }
1975 
1976 void AsmPrinter::EmitModuleCommandLines(Module &M) {
1978  if (!CommandLine)
1979  return;
1980 
1981  const NamedMDNode *NMD = M.getNamedMetadata("llvm.commandline");
1982  if (!NMD || !NMD->getNumOperands())
1983  return;
1984 
1985  OutStreamer->PushSection();
1986  OutStreamer->SwitchSection(CommandLine);
1987  OutStreamer->EmitZeros(1);
1988  for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) {
1989  const MDNode *N = NMD->getOperand(i);
1990  assert(N->getNumOperands() == 1 &&
1991  "llvm.commandline metadata entry can have only one operand");
1992  const MDString *S = cast<MDString>(N->getOperand(0));
1993  OutStreamer->EmitBytes(S->getString());
1994  OutStreamer->EmitZeros(1);
1995  }
1996  OutStreamer->PopSection();
1997 }
1998 
1999 //===--------------------------------------------------------------------===//
2000 // Emission and print routines
2001 //
2002 
2003 /// Emit a byte directive and value.
2004 ///
2005 void AsmPrinter::emitInt8(int Value) const {
2006  OutStreamer->EmitIntValue(Value, 1);
2007 }
2008 
2009 /// Emit a short directive and value.
2010 void AsmPrinter::emitInt16(int Value) const {
2011  OutStreamer->EmitIntValue(Value, 2);
2012 }
2013 
2014 /// Emit a long directive and value.
2015 void AsmPrinter::emitInt32(int Value) const {
2016  OutStreamer->EmitIntValue(Value, 4);
2017 }
2018 
2019 /// Emit a long long directive and value.
2020 void AsmPrinter::emitInt64(uint64_t Value) const {
2021  OutStreamer->EmitIntValue(Value, 8);
2022 }
2023 
2024 /// Emit something like ".long Hi-Lo" where the size in bytes of the directive
2025 /// is specified by Size and Hi/Lo specify the labels. This implicitly uses
2026 /// .set if it avoids relocations.
2028  unsigned Size) const {
2029  OutStreamer->emitAbsoluteSymbolDiff(Hi, Lo, Size);
2030 }
2031 
2032 /// EmitLabelPlusOffset - Emit something like ".long Label+Offset"
2033 /// where the size in bytes of the directive is specified by Size and Label
2034 /// specifies the label. This implicitly uses .set if it is available.
2036  unsigned Size,
2037  bool IsSectionRelative) const {
2038  if (MAI->needsDwarfSectionOffsetDirective() && IsSectionRelative) {
2039  OutStreamer->EmitCOFFSecRel32(Label, Offset);
2040  if (Size > 4)
2041  OutStreamer->EmitZeros(Size - 4);
2042  return;
2043  }
2044 
2045  // Emit Label+Offset (or just Label if Offset is zero)
2046  const MCExpr *Expr = MCSymbolRefExpr::create(Label, OutContext);
2047  if (Offset)
2048  Expr = MCBinaryExpr::createAdd(
2049  Expr, MCConstantExpr::create(Offset, OutContext), OutContext);
2050 
2051  OutStreamer->EmitValue(Expr, Size);
2052 }
2053 
2054 //===----------------------------------------------------------------------===//
2055 
2056 // EmitAlignment - Emit an alignment directive to the specified power of
2057 // two boundary. For example, if you pass in 3 here, you will get an 8
2058 // byte alignment. If a global value is specified, and if that global has
2059 // an explicit alignment requested, it will override the alignment request
2060 // if required for correctness.
2061 void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalObject *GV) const {
2062  if (GV)
2063  NumBits = getGVAlignmentLog2(GV, GV->getParent()->getDataLayout(), NumBits);
2064 
2065  if (NumBits == 0) return; // 1-byte aligned: no need to emit alignment.
2066 
2067  assert(NumBits <
2068  static_cast<unsigned>(std::numeric_limits<unsigned>::digits) &&
2069  "undefined behavior");
2070  if (getCurrentSection()->getKind().isText())
2071  OutStreamer->EmitCodeAlignment(1u << NumBits);
2072  else
2073  OutStreamer->EmitValueToAlignment(1u << NumBits);
2074 }
2075 
2076 //===----------------------------------------------------------------------===//
2077 // Constant emission.
2078 //===----------------------------------------------------------------------===//
2079 
2081  MCContext &Ctx = OutContext;
2082 
2083  if (CV->isNullValue() || isa<UndefValue>(CV))
2084  return MCConstantExpr::create(0, Ctx);
2085 
2086  if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV))
2087  return MCConstantExpr::create(CI->getZExtValue(), Ctx);
2088 
2089  if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV))
2090  return MCSymbolRefExpr::create(getSymbol(GV), Ctx);
2091 
2092  if (const BlockAddress *BA = dyn_cast<BlockAddress>(CV))
2094 
2095  const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV);
2096  if (!CE) {
2097  llvm_unreachable("Unknown constant value to lower!");
2098  }
2099 
2100  switch (CE->getOpcode()) {
2101  default:
2102  // If the code isn't optimized, there may be outstanding folding
2103  // opportunities. Attempt to fold the expression using DataLayout as a
2104  // last resort before giving up.
2106  if (C != CE)
2107  return lowerConstant(C);
2108 
2109  // Otherwise report the problem to the user.
2110  {
2111  std::string S;
2112  raw_string_ostream OS(S);
2113  OS << "Unsupported expression in static initializer: ";
2114  CE->printAsOperand(OS, /*PrintType=*/false,
2115  !MF ? nullptr : MF->getFunction().getParent());
2116  report_fatal_error(OS.str());
2117  }
2118  case Instruction::GetElementPtr: {
2119  // Generate a symbolic expression for the byte address
2120  APInt OffsetAI(getDataLayout().getPointerTypeSizeInBits(CE->getType()), 0);
2121  cast<GEPOperator>(CE)->accumulateConstantOffset(getDataLayout(), OffsetAI);
2122 
2123  const MCExpr *Base = lowerConstant(CE->getOperand(0));
2124  if (!OffsetAI)
2125  return Base;
2126 
2127  int64_t Offset = OffsetAI.getSExtValue();
2128  return MCBinaryExpr::createAdd(Base, MCConstantExpr::create(Offset, Ctx),
2129  Ctx);
2130  }
2131 
2132  case Instruction::Trunc:
2133  // We emit the value and depend on the assembler to truncate the generated
2134  // expression properly. This is important for differences between
2135  // blockaddress labels. Since the two labels are in the same function, it
2136  // is reasonable to treat their delta as a 32-bit value.
2138  case Instruction::BitCast:
2139  return lowerConstant(CE->getOperand(0));
2140 
2141  case Instruction::IntToPtr: {
2142  const DataLayout &DL = getDataLayout();
2143 
2144  // Handle casts to pointers by changing them into casts to the appropriate
2145  // integer type. This promotes constant folding and simplifies this code.
2146  Constant *Op = CE->getOperand(0);
2148  false/*ZExt*/);
2149  return lowerConstant(Op);
2150  }
2151 
2152  case Instruction::PtrToInt: {
2153  const DataLayout &DL = getDataLayout();
2154 
2155  // Support only foldable casts to/from pointers that can be eliminated by
2156  // changing the pointer to the appropriately sized integer type.
2157  Constant *Op = CE->getOperand(0);
2158  Type *Ty = CE->getType();
2159 
2160  const MCExpr *OpExpr = lowerConstant(Op);
2161 
2162  // We can emit the pointer value into this slot if the slot is an
2163  // integer slot equal to the size of the pointer.
2164  if (DL.getTypeAllocSize(Ty) == DL.getTypeAllocSize(Op->getType()))
2165  return OpExpr;
2166 
2167  // Otherwise the pointer is smaller than the resultant integer, mask off
2168  // the high bits so we are sure to get a proper truncation if the input is
2169  // a constant expr.
2170  unsigned InBits = DL.getTypeAllocSizeInBits(Op->getType());
2171  const MCExpr *MaskExpr = MCConstantExpr::create(~0ULL >> (64-InBits), Ctx);
2172  return MCBinaryExpr::createAnd(OpExpr, MaskExpr, Ctx);
2173  }
2174 
2175  case Instruction::Sub: {
2176  GlobalValue *LHSGV;
2177  APInt LHSOffset;
2178  if (IsConstantOffsetFromGlobal(CE->getOperand(0), LHSGV, LHSOffset,
2179  getDataLayout())) {
2180  GlobalValue *RHSGV;
2181  APInt RHSOffset;
2182  if (IsConstantOffsetFromGlobal(CE->getOperand(1), RHSGV, RHSOffset,
2183  getDataLayout())) {
2184  const MCExpr *RelocExpr =
2185  getObjFileLowering().lowerRelativeReference(LHSGV, RHSGV, TM);
2186  if (!RelocExpr)
2187  RelocExpr = MCBinaryExpr::createSub(
2188  MCSymbolRefExpr::create(getSymbol(LHSGV), Ctx),
2189  MCSymbolRefExpr::create(getSymbol(RHSGV), Ctx), Ctx);
2190  int64_t Addend = (LHSOffset - RHSOffset).getSExtValue();
2191  if (Addend != 0)
2192  RelocExpr = MCBinaryExpr::createAdd(
2193  RelocExpr, MCConstantExpr::create(Addend, Ctx), Ctx);
2194  return RelocExpr;
2195  }
2196  }
2197  }
2198  // else fallthrough
2200 
2201  // The MC library also has a right-shift operator, but it isn't consistently
2202  // signed or unsigned between different targets.
2203  case Instruction::Add:
2204  case Instruction::Mul:
2205  case Instruction::SDiv:
2206  case Instruction::SRem:
2207  case Instruction::Shl:
2208  case Instruction::And:
2209  case Instruction::Or:
2210  case Instruction::Xor: {
2211  const MCExpr *LHS = lowerConstant(CE->getOperand(0));
2212  const MCExpr *RHS = lowerConstant(CE->getOperand(1));
2213  switch (CE->getOpcode()) {
2214  default: llvm_unreachable("Unknown binary operator constant cast expr");
2215  case Instruction::Add: return MCBinaryExpr::createAdd(LHS, RHS, Ctx);
2216  case Instruction::Sub: return MCBinaryExpr::createSub(LHS, RHS, Ctx);
2217  case Instruction::Mul: return MCBinaryExpr::createMul(LHS, RHS, Ctx);
2218  case Instruction::SDiv: return MCBinaryExpr::createDiv(LHS, RHS, Ctx);
2219  case Instruction::SRem: return MCBinaryExpr::createMod(LHS, RHS, Ctx);
2220  case Instruction::Shl: return MCBinaryExpr::createShl(LHS, RHS, Ctx);
2221  case Instruction::And: return MCBinaryExpr::createAnd(LHS, RHS, Ctx);
2222  case Instruction::Or: return MCBinaryExpr::createOr (LHS, RHS, Ctx);
2223  case Instruction::Xor: return MCBinaryExpr::createXor(LHS, RHS, Ctx);
2224  }
2225  }
2226  }
2227 }
2228 
2229 static void emitGlobalConstantImpl(const DataLayout &DL, const Constant *C,
2230  AsmPrinter &AP,
2231  const Constant *BaseCV = nullptr,
2232  uint64_t Offset = 0);
2233 
2234 static void emitGlobalConstantFP(const ConstantFP *CFP, AsmPrinter &AP);
2235 static void emitGlobalConstantFP(APFloat APF, Type *ET, AsmPrinter &AP);
2236 
2237 /// isRepeatedByteSequence - Determine whether the given value is
2238 /// composed of a repeated sequence of identical bytes and return the
2239 /// byte value. If it is not a repeated sequence, return -1.
2242  assert(!Data.empty() && "Empty aggregates should be CAZ node");
2243  char C = Data[0];
2244  for (unsigned i = 1, e = Data.size(); i != e; ++i)
2245  if (Data[i] != C) return -1;
2246  return static_cast<uint8_t>(C); // Ensure 255 is not returned as -1.
2247 }
2248 
2249 /// isRepeatedByteSequence - Determine whether the given value is
2250 /// composed of a repeated sequence of identical bytes and return the
2251 /// byte value. If it is not a repeated sequence, return -1.
2252 static int isRepeatedByteSequence(const Value *V, const DataLayout &DL) {
2253  if (const ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
2254  uint64_t Size = DL.getTypeAllocSizeInBits(V->getType());
2255  assert(Size % 8 == 0);
2256 
2257  // Extend the element to take zero padding into account.
2258  APInt Value = CI->getValue().zextOrSelf(Size);
2259  if (!Value.isSplat(8))
2260  return -1;
2261 
2262  return Value.zextOrTrunc(8).getZExtValue();
2263  }
2264  if (const ConstantArray *CA = dyn_cast<ConstantArray>(V)) {
2265  // Make sure all array elements are sequences of the same repeated
2266  // byte.
2267  assert(CA->getNumOperands() != 0 && "Should be a CAZ");
2268  Constant *Op0 = CA->getOperand(0);
2269  int Byte = isRepeatedByteSequence(Op0, DL);
2270  if (Byte == -1)
2271  return -1;
2272 
2273  // All array elements must be equal.
2274  for (unsigned i = 1, e = CA->getNumOperands(); i != e; ++i)
2275  if (CA->getOperand(i) != Op0)
2276  return -1;
2277  return Byte;
2278  }
2279 
2280  if (const ConstantDataSequential *CDS = dyn_cast<ConstantDataSequential>(V))
2281  return isRepeatedByteSequence(CDS);
2282 
2283  return -1;
2284 }
2285 
2287  const ConstantDataSequential *CDS,
2288  AsmPrinter &AP) {
2289  // See if we can aggregate this into a .fill, if so, emit it as such.
2290  int Value = isRepeatedByteSequence(CDS, DL);
2291  if (Value != -1) {
2292  uint64_t Bytes = DL.getTypeAllocSize(CDS->getType());
2293  // Don't emit a 1-byte object as a .fill.
2294  if (Bytes > 1)
2295  return AP.OutStreamer->emitFill(Bytes, Value);
2296  }
2297 
2298  // If this can be emitted with .ascii/.asciz, emit it as such.
2299  if (CDS->isString())
2300  return AP.OutStreamer->EmitBytes(CDS->getAsString());
2301 
2302  // Otherwise, emit the values in successive locations.
2303  unsigned ElementByteSize = CDS->getElementByteSize();
2304  if (isa<IntegerType>(CDS->getElementType())) {
2305  for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) {
2306  if (AP.isVerbose())
2307  AP.OutStreamer->GetCommentOS() << format("0x%" PRIx64 "\n",
2308  CDS->getElementAsInteger(i));
2309  AP.OutStreamer->EmitIntValue(CDS->getElementAsInteger(i),
2310  ElementByteSize);
2311  }
2312  } else {
2313  Type *ET = CDS->getElementType();
2314  for (unsigned I = 0, E = CDS->getNumElements(); I != E; ++I)
2316  }
2317 
2318  unsigned Size = DL.getTypeAllocSize(CDS->getType());
2319  unsigned EmittedSize = DL.getTypeAllocSize(CDS->getType()->getElementType()) *
2320  CDS->getNumElements();
2321  assert(EmittedSize <= Size && "Size cannot be less than EmittedSize!");
2322  if (unsigned Padding = Size - EmittedSize)
2323  AP.OutStreamer->EmitZeros(Padding);
2324 }
2325 
2326 static void emitGlobalConstantArray(const DataLayout &DL,
2327  const ConstantArray *CA, AsmPrinter &AP,
2328  const Constant *BaseCV, uint64_t Offset) {
2329  // See if we can aggregate some values. Make sure it can be
2330  // represented as a series of bytes of the constant value.
2331  int Value = isRepeatedByteSequence(CA, DL);
2332 
2333  if (Value != -1) {
2334  uint64_t Bytes = DL.getTypeAllocSize(CA->getType());
2335  AP.OutStreamer->emitFill(Bytes, Value);
2336  }
2337  else {
2338  for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i) {
2339  emitGlobalConstantImpl(DL, CA->getOperand(i), AP, BaseCV, Offset);
2340  Offset += DL.getTypeAllocSize(CA->getOperand(i)->getType());
2341  }
2342  }
2343 }
2344 
2345 static void emitGlobalConstantVector(const DataLayout &DL,
2346  const ConstantVector *CV, AsmPrinter &AP) {
2347  for (unsigned i = 0, e = CV->getType()->getNumElements(); i != e; ++i)
2348  emitGlobalConstantImpl(DL, CV->getOperand(i), AP);
2349 
2350  unsigned Size = DL.getTypeAllocSize(CV->getType());
2351  unsigned EmittedSize = DL.getTypeAllocSize(CV->getType()->getElementType()) *
2352  CV->getType()->getNumElements();
2353  if (unsigned Padding = Size - EmittedSize)
2354  AP.OutStreamer->EmitZeros(Padding);
2355 }
2356 
2357 static void emitGlobalConstantStruct(const DataLayout &DL,
2358  const ConstantStruct *CS, AsmPrinter &AP,
2359  const Constant *BaseCV, uint64_t Offset) {
2360  // Print the fields in successive locations. Pad to align if needed!
2361  unsigned Size = DL.getTypeAllocSize(CS->getType());
2362  const StructLayout *Layout = DL.getStructLayout(CS->getType());
2363  uint64_t SizeSoFar = 0;
2364  for (unsigned i = 0, e = CS->getNumOperands(); i != e; ++i) {
2365  const Constant *Field = CS->getOperand(i);
2366 
2367  // Print the actual field value.
2368  emitGlobalConstantImpl(DL, Field, AP, BaseCV, Offset + SizeSoFar);
2369 
2370  // Check if padding is needed and insert one or more 0s.
2371  uint64_t FieldSize = DL.getTypeAllocSize(Field->getType());
2372  uint64_t PadSize = ((i == e-1 ? Size : Layout->getElementOffset(i+1))
2373  - Layout->getElementOffset(i)) - FieldSize;
2374  SizeSoFar += FieldSize + PadSize;
2375 
2376  // Insert padding - this may include padding to increase the size of the
2377  // current field up to the ABI size (if the struct is not packed) as well
2378  // as padding to ensure that the next field starts at the right offset.
2379  AP.OutStreamer->EmitZeros(PadSize);
2380  }
2381  assert(SizeSoFar == Layout->getSizeInBytes() &&
2382  "Layout of constant struct may be incorrect!");
2383 }
2384 
2385 static void emitGlobalConstantFP(APFloat APF, Type *ET, AsmPrinter &AP) {
2386  APInt API = APF.bitcastToAPInt();
2387 
2388  // First print a comment with what we think the original floating-point value
2389  // should have been.
2390  if (AP.isVerbose()) {
2392  APF.toString(StrVal);
2393 
2394  if (ET)
2395  ET->print(AP.OutStreamer->GetCommentOS());
2396  else
2397  AP.OutStreamer->GetCommentOS() << "Printing <null> Type";
2398  AP.OutStreamer->GetCommentOS() << ' ' << StrVal << '\n';
2399  }
2400 
2401  // Now iterate through the APInt chunks, emitting them in endian-correct
2402  // order, possibly with a smaller chunk at beginning/end (e.g. for x87 80-bit
2403  // floats).
2404  unsigned NumBytes = API.getBitWidth() / 8;
2405  unsigned TrailingBytes = NumBytes % sizeof(uint64_t);
2406  const uint64_t *p = API.getRawData();
2407 
2408  // PPC's long double has odd notions of endianness compared to how LLVM
2409  // handles it: p[0] goes first for *big* endian on PPC.
2410  if (AP.getDataLayout().isBigEndian() && !ET->isPPC_FP128Ty()) {
2411  int Chunk = API.getNumWords() - 1;
2412 
2413  if (TrailingBytes)
2414  AP.OutStreamer->EmitIntValue(p[Chunk--], TrailingBytes);
2415 
2416  for (; Chunk >= 0; --Chunk)
2417  AP.OutStreamer->EmitIntValue(p[Chunk], sizeof(uint64_t));
2418  } else {
2419  unsigned Chunk;
2420  for (Chunk = 0; Chunk < NumBytes / sizeof(uint64_t); ++Chunk)
2421  AP.OutStreamer->EmitIntValue(p[Chunk], sizeof(uint64_t));
2422 
2423  if (TrailingBytes)
2424  AP.OutStreamer->EmitIntValue(p[Chunk], TrailingBytes);
2425  }
2426 
2427  // Emit the tail padding for the long double.
2428  const DataLayout &DL = AP.getDataLayout();
2429  AP.OutStreamer->EmitZeros(DL.getTypeAllocSize(ET) - DL.getTypeStoreSize(ET));
2430 }
2431 
2432 static void emitGlobalConstantFP(const ConstantFP *CFP, AsmPrinter &AP) {
2433  emitGlobalConstantFP(CFP->getValueAPF(), CFP->getType(), AP);
2434 }
2435 
2437  const DataLayout &DL = AP.getDataLayout();
2438  unsigned BitWidth = CI->getBitWidth();
2439 
2440  // Copy the value as we may massage the layout for constants whose bit width
2441  // is not a multiple of 64-bits.
2442  APInt Realigned(CI->getValue());
2443  uint64_t ExtraBits = 0;
2444  unsigned ExtraBitsSize = BitWidth & 63;
2445 
2446  if (ExtraBitsSize) {
2447  // The bit width of the data is not a multiple of 64-bits.
2448  // The extra bits are expected to be at the end of the chunk of the memory.
2449  // Little endian:
2450  // * Nothing to be done, just record the extra bits to emit.
2451  // Big endian:
2452  // * Record the extra bits to emit.
2453  // * Realign the raw data to emit the chunks of 64-bits.
2454  if (DL.isBigEndian()) {
2455  // Basically the structure of the raw data is a chunk of 64-bits cells:
2456  // 0 1 BitWidth / 64
2457  // [chunk1][chunk2] ... [chunkN].
2458  // The most significant chunk is chunkN and it should be emitted first.
2459  // However, due to the alignment issue chunkN contains useless bits.
2460  // Realign the chunks so that they contain only useless information:
2461  // ExtraBits 0 1 (BitWidth / 64) - 1
2462  // chu[nk1 chu][nk2 chu] ... [nkN-1 chunkN]
2463  ExtraBits = Realigned.getRawData()[0] &
2464  (((uint64_t)-1) >> (64 - ExtraBitsSize));
2465  Realigned.lshrInPlace(ExtraBitsSize);
2466  } else
2467  ExtraBits = Realigned.getRawData()[BitWidth / 64];
2468  }
2469 
2470  // We don't expect assemblers to support integer data directives
2471  // for more than 64 bits, so we emit the data in at most 64-bit
2472  // quantities at a time.
2473  const uint64_t *RawData = Realigned.getRawData();
2474  for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) {
2475  uint64_t Val = DL.isBigEndian() ? RawData[e - i - 1] : RawData[i];
2476  AP.OutStreamer->EmitIntValue(Val, 8);
2477  }
2478 
2479  if (ExtraBitsSize) {
2480  // Emit the extra bits after the 64-bits chunks.
2481 
2482  // Emit a directive that fills the expected size.
2483  uint64_t Size = AP.getDataLayout().getTypeAllocSize(CI->getType());
2484  Size -= (BitWidth / 64) * 8;
2485  assert(Size && Size * 8 >= ExtraBitsSize &&
2486  (ExtraBits & (((uint64_t)-1) >> (64 - ExtraBitsSize)))
2487  == ExtraBits && "Directive too small for extra bits.");
2488  AP.OutStreamer->EmitIntValue(ExtraBits, Size);
2489  }
2490 }
2491 
2492 /// Transform a not absolute MCExpr containing a reference to a GOT
2493 /// equivalent global, by a target specific GOT pc relative access to the
2494 /// final symbol.
2495 static void handleIndirectSymViaGOTPCRel(AsmPrinter &AP, const MCExpr **ME,
2496  const Constant *BaseCst,
2497  uint64_t Offset) {
2498  // The global @foo below illustrates a global that uses a got equivalent.
2499  //
2500  // @bar = global i32 42
2501  // @gotequiv = private unnamed_addr constant i32* @bar
2502  // @foo = i32 trunc (i64 sub (i64 ptrtoint (i32** @gotequiv to i64),
2503  // i64 ptrtoint (i32* @foo to i64))
2504  // to i32)
2505  //
2506  // The cstexpr in @foo is converted into the MCExpr `ME`, where we actually
2507  // check whether @foo is suitable to use a GOTPCREL. `ME` is usually in the
2508  // form:
2509  //
2510  // foo = cstexpr, where
2511  // cstexpr := <gotequiv> - "." + <cst>
2512  // cstexpr := <gotequiv> - (<foo> - <offset from @foo base>) + <cst>
2513  //
2514  // After canonicalization by evaluateAsRelocatable `ME` turns into:
2515  //
2516  // cstexpr := <gotequiv> - <foo> + gotpcrelcst, where
2517  // gotpcrelcst := <offset from @foo base> + <cst>
2518  MCValue MV;
2519  if (!(*ME)->evaluateAsRelocatable(MV, nullptr, nullptr) || MV.isAbsolute())
2520  return;
2521  const MCSymbolRefExpr *SymA = MV.getSymA();
2522  if (!SymA)
2523  return;
2524 
2525  // Check that GOT equivalent symbol is cached.
2526  const MCSymbol *GOTEquivSym = &SymA->getSymbol();
2527  if (!AP.GlobalGOTEquivs.count(GOTEquivSym))
2528  return;
2529 
2530  const GlobalValue *BaseGV = dyn_cast_or_null<GlobalValue>(BaseCst);
2531  if (!BaseGV)
2532  return;
2533 
2534  // Check for a valid base symbol
2535  const MCSymbol *BaseSym = AP.getSymbol(BaseGV);
2536  const MCSymbolRefExpr *SymB = MV.getSymB();
2537 
2538  if (!SymB || BaseSym != &SymB->getSymbol())
2539  return;
2540 
2541  // Make sure to match:
2542  //
2543  // gotpcrelcst := <offset from @foo base> + <cst>
2544  //
2545  // If gotpcrelcst is positive it means that we can safely fold the pc rel
2546  // displacement into the GOTPCREL. We can also can have an extra offset <cst>
2547  // if the target knows how to encode it.
2548  int64_t GOTPCRelCst = Offset + MV.getConstant();
2549  if (GOTPCRelCst < 0)
2550  return;
2551  if (!AP.getObjFileLowering().supportGOTPCRelWithOffset() && GOTPCRelCst != 0)
2552  return;
2553 
2554  // Emit the GOT PC relative to replace the got equivalent global, i.e.:
2555  //
2556  // bar:
2557  // .long 42
2558  // gotequiv:
2559  // .quad bar
2560  // foo:
2561  // .long gotequiv - "." + <cst>
2562  //
2563  // is replaced by the target specific equivalent to:
2564  //
2565  // bar:
2566  // .long 42
2567  // foo:
2568  // .long bar@GOTPCREL+<gotpcrelcst>
2569  AsmPrinter::GOTEquivUsePair Result = AP.GlobalGOTEquivs[GOTEquivSym];
2570  const GlobalVariable *GV = Result.first;
2571  int NumUses = (int)Result.second;
2572  const GlobalValue *FinalGV = dyn_cast<GlobalValue>(GV->getOperand(0));
2573  const MCSymbol *FinalSym = AP.getSymbol(FinalGV);
2575  FinalSym, MV, Offset, AP.MMI, *AP.OutStreamer);
2576 
2577  // Update GOT equivalent usage information
2578  --NumUses;
2579  if (NumUses >= 0)
2580  AP.GlobalGOTEquivs[GOTEquivSym] = std::make_pair(GV, NumUses);
2581 }
2582 
2583 static void emitGlobalConstantImpl(const DataLayout &DL, const Constant *CV,
2584  AsmPrinter &AP, const Constant *BaseCV,
2585  uint64_t Offset) {
2586  uint64_t Size = DL.getTypeAllocSize(CV->getType());
2587 
2588  // Globals with sub-elements such as combinations of arrays and structs
2589  // are handled recursively by emitGlobalConstantImpl. Keep track of the
2590  // constant symbol base and the current position with BaseCV and Offset.
2591  if (!BaseCV && CV->hasOneUse())
2592  BaseCV = dyn_cast<Constant>(CV->user_back());
2593 
2594  if (isa<ConstantAggregateZero>(CV) || isa<UndefValue>(CV))
2595  return AP.OutStreamer->EmitZeros(Size);
2596 
2597  if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
2598  switch (Size) {
2599  case 1:
2600  case 2:
2601  case 4:
2602  case 8:
2603  if (AP.isVerbose())
2604  AP.OutStreamer->GetCommentOS() << format("0x%" PRIx64 "\n",
2605  CI->getZExtValue());
2606  AP.OutStreamer->EmitIntValue(CI->getZExtValue(), Size);
2607  return;
2608  default:
2610  return;
2611  }
2612  }
2613 
2614  if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV))
2615  return emitGlobalConstantFP(CFP, AP);
2616 
2617  if (isa<ConstantPointerNull>(CV)) {
2618  AP.OutStreamer->EmitIntValue(0, Size);
2619  return;
2620  }
2621 
2622  if (const ConstantDataSequential *CDS = dyn_cast<ConstantDataSequential>(CV))
2623  return emitGlobalConstantDataSequential(DL, CDS, AP);
2624 
2625  if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV))
2626  return emitGlobalConstantArray(DL, CVA, AP, BaseCV, Offset);
2627 
2628  if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV))
2629  return emitGlobalConstantStruct(DL, CVS, AP, BaseCV, Offset);
2630 
2631  if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) {
2632  // Look through bitcasts, which might not be able to be MCExpr'ized (e.g. of
2633  // vectors).
2634  if (CE->getOpcode() == Instruction::BitCast)
2635  return emitGlobalConstantImpl(DL, CE->getOperand(0), AP);
2636 
2637  if (Size > 8) {
2638  // If the constant expression's size is greater than 64-bits, then we have
2639  // to emit the value in chunks. Try to constant fold the value and emit it
2640  // that way.
2641  Constant *New = ConstantFoldConstant(CE, DL);
2642  if (New && New != CE)
2643  return emitGlobalConstantImpl(DL, New, AP);
2644  }
2645  }
2646 
2647  if (const ConstantVector *V = dyn_cast<ConstantVector>(CV))
2648  return emitGlobalConstantVector(DL, V, AP);
2649 
2650  // Otherwise, it must be a ConstantExpr. Lower it to an MCExpr, then emit it
2651  // thread the streamer with EmitValue.
2652  const MCExpr *ME = AP.lowerConstant(CV);
2653 
2654  // Since lowerConstant already folded and got rid of all IR pointer and
2655  // integer casts, detect GOT equivalent accesses by looking into the MCExpr
2656  // directly.
2658  handleIndirectSymViaGOTPCRel(AP, &ME, BaseCV, Offset);
2659 
2660  AP.OutStreamer->EmitValue(ME, Size);
2661 }
2662 
2663 /// EmitGlobalConstant - Print a general LLVM constant to the .s file.
2665  uint64_t Size = DL.getTypeAllocSize(CV->getType());
2666  if (Size)
2667  emitGlobalConstantImpl(DL, CV, *this);
2668  else if (MAI->hasSubsectionsViaSymbols()) {
2669  // If the global has zero size, emit a single byte so that two labels don't
2670  // look like they are at the same location.
2671  OutStreamer->EmitIntValue(0, 1);
2672  }
2673 }
2674 
2676  // Target doesn't support this yet!
2677  llvm_unreachable("Target does not support EmitMachineConstantPoolValue");
2678 }
2679 
2680 void AsmPrinter::printOffset(int64_t Offset, raw_ostream &OS) const {
2681  if (Offset > 0)
2682  OS << '+' << Offset;
2683  else if (Offset < 0)
2684  OS << Offset;
2685 }
2686 
2687 //===----------------------------------------------------------------------===//
2688 // Symbol Lowering Routines.
2689 //===----------------------------------------------------------------------===//
2690 
2692  return OutContext.createTempSymbol(Name, true);
2693 }
2694 
2696  return MMI->getAddrLabelSymbol(BA->getBasicBlock());
2697 }
2698 
2700  return MMI->getAddrLabelSymbol(BB);
2701 }
2702 
2703 /// GetCPISymbol - Return the symbol for the specified constant pool entry.
2704 MCSymbol *AsmPrinter::GetCPISymbol(unsigned CPID) const {
2705  if (getSubtargetInfo().getTargetTriple().isKnownWindowsMSVCEnvironment()) {
2706  const MachineConstantPoolEntry &CPE =
2707  MF->getConstantPool()->getConstants()[CPID];
2708  if (!CPE.isMachineConstantPoolEntry()) {
2709  const DataLayout &DL = MF->getDataLayout();
2710  SectionKind Kind = CPE.getSectionKind(&DL);
2711  const Constant *C = CPE.Val.ConstVal;
2712  unsigned Align = CPE.Alignment;
2713  if (const MCSectionCOFF *S = dyn_cast<MCSectionCOFF>(
2714  getObjFileLowering().getSectionForConstant(DL, Kind, C, Align))) {
2715  if (MCSymbol *Sym = S->getCOMDATSymbol()) {
2716  if (Sym->isUndefined())
2717  OutStreamer->EmitSymbolAttribute(Sym, MCSA_Global);
2718  return Sym;
2719  }
2720  }
2721  }
2722  }
2723 
2724  const DataLayout &DL = getDataLayout();
2726  "CPI" + Twine(getFunctionNumber()) + "_" +
2727  Twine(CPID));
2728 }
2729 
2730 /// GetJTISymbol - Return the symbol for the specified jump table entry.
2731 MCSymbol *AsmPrinter::GetJTISymbol(unsigned JTID, bool isLinkerPrivate) const {
2732  return MF->getJTISymbol(JTID, OutContext, isLinkerPrivate);
2733 }
2734 
2735 /// GetJTSetSymbol - Return the symbol for the specified jump table .set
2736 /// FIXME: privatize to AsmPrinter.
2737 MCSymbol *AsmPrinter::GetJTSetSymbol(unsigned UID, unsigned MBBID) const {
2738  const DataLayout &DL = getDataLayout();
2740  Twine(getFunctionNumber()) + "_" +
2741  Twine(UID) + "_set_" + Twine(MBBID));
2742 }
2743 
2745  StringRef Suffix) const {
2746  return getObjFileLowering().getSymbolWithGlobalValueBase(GV, Suffix, TM);
2747 }
2748 
2749 /// Return the MCSymbol for the specified ExternalSymbol.
2751  SmallString<60> NameStr;
2752  Mangler::getNameWithPrefix(NameStr, Sym, getDataLayout());
2753  return OutContext.getOrCreateSymbol(NameStr);
2754 }
2755 
2756 /// PrintParentLoopComment - Print comments about parent loops of this one.
2758  unsigned FunctionNumber) {
2759  if (!Loop) return;
2761  OS.indent(Loop->getLoopDepth()*2)
2762  << "Parent Loop BB" << FunctionNumber << "_"
2763  << Loop->getHeader()->getNumber()
2764  << " Depth=" << Loop->getLoopDepth() << '\n';
2765 }
2766 
2767 /// PrintChildLoopComment - Print comments about child loops within
2768 /// the loop for this basic block, with nesting.
2770  unsigned FunctionNumber) {
2771  // Add child loop information
2772  for (const MachineLoop *CL : *Loop) {
2773  OS.indent(CL->getLoopDepth()*2)
2774  << "Child Loop BB" << FunctionNumber << "_"
2775  << CL->getHeader()->getNumber() << " Depth " << CL->getLoopDepth()
2776  << '\n';
2777  PrintChildLoopComment(OS, CL, FunctionNumber);
2778  }
2779 }
2780 
2781 /// emitBasicBlockLoopComments - Pretty-print comments for basic blocks.
2783  const MachineLoopInfo *LI,
2784  const AsmPrinter &AP) {
2785  // Add loop depth information
2786  const MachineLoop *Loop = LI->getLoopFor(&MBB);
2787  if (!Loop) return;
2788 
2789  MachineBasicBlock *Header = Loop->getHeader();
2790  assert(Header && "No header for loop");
2791 
2792  // If this block is not a loop header, just print out what is the loop header
2793  // and return.
2794  if (Header != &MBB) {
2795  AP.OutStreamer->AddComment(" in Loop: Header=BB" +
2796  Twine(AP.getFunctionNumber())+"_" +
2797  Twine(Loop->getHeader()->getNumber())+
2798  " Depth="+Twine(Loop->getLoopDepth()));
2799  return;
2800  }
2801 
2802  // Otherwise, it is a loop header. Print out information about child and
2803  // parent loops.
2804  raw_ostream &OS = AP.OutStreamer->GetCommentOS();
2805 
2807 
2808  OS << "=>";
2809  OS.indent(Loop->getLoopDepth()*2-2);
2810 
2811  OS << "This ";
2812  if (Loop->empty())
2813  OS << "Inner ";
2814  OS << "Loop Header: Depth=" + Twine(Loop->getLoopDepth()) << '\n';
2815 
2816  PrintChildLoopComment(OS, Loop, AP.getFunctionNumber());
2817 }
2818 
2819 void AsmPrinter::setupCodePaddingContext(const MachineBasicBlock &MBB,
2820  MCCodePaddingContext &Context) const {
2821  assert(MF != nullptr && "Machine function must be valid");
2822  Context.IsPaddingActive = !MF->hasInlineAsm() &&
2823  !MF->getFunction().optForSize() &&
2826  std::find(MBB.pred_begin(), MBB.pred_end(), MBB.getPrevNode()) !=
2827  MBB.pred_end();
2829  MBB.pred_size() > 0 && !isBlockOnlyReachableByFallthrough(&MBB);
2830 }
2831 
2832 /// EmitBasicBlockStart - This method prints the label for the specified
2833 /// MachineBasicBlock, an alignment (if present) and a comment describing
2834 /// it if appropriate.
2836  // End the previous funclet and start a new one.
2837  if (MBB.isEHFuncletEntry()) {
2838  for (const HandlerInfo &HI : Handlers) {
2839  HI.Handler->endFunclet();
2840  HI.Handler->beginFunclet(MBB);
2841  }
2842  }
2843 
2844  // Emit an alignment directive for this block, if needed.
2845  if (unsigned Align = MBB.getAlignment())
2848  setupCodePaddingContext(MBB, Context);
2849  OutStreamer->EmitCodePaddingBasicBlockStart(Context);
2850 
2851  // If the block has its address taken, emit any labels that were used to
2852  // reference the block. It is possible that there is more than one label
2853  // here, because multiple LLVM BB's may have been RAUW'd to this block after
2854  // the references were generated.
2855  if (MBB.hasAddressTaken()) {
2856  const BasicBlock *BB = MBB.getBasicBlock();
2857  if (isVerbose())
2858  OutStreamer->AddComment("Block address taken");
2859 
2860  // MBBs can have their address taken as part of CodeGen without having
2861  // their corresponding BB's address taken in IR
2862  if (BB->hasAddressTaken())
2863  for (MCSymbol *Sym : MMI->getAddrLabelSymbolToEmit(BB))
2864  OutStreamer->EmitLabel(Sym);
2865  }
2866 
2867  // Print some verbose block comments.
2868  if (isVerbose()) {
2869  if (const BasicBlock *BB = MBB.getBasicBlock()) {
2870  if (BB->hasName()) {
2871  BB->printAsOperand(OutStreamer->GetCommentOS(),
2872  /*PrintType=*/false, BB->getModule());
2873  OutStreamer->GetCommentOS() << '\n';
2874  }
2875  }
2876 
2877  assert(MLI != nullptr && "MachineLoopInfo should has been computed");
2878  emitBasicBlockLoopComments(MBB, MLI, *this);
2879  }
2880 
2881  // Print the main label for the block.
2882  if (MBB.pred_empty() ||
2884  if (isVerbose()) {
2885  // NOTE: Want this comment at start of line, don't emit with AddComment.
2886  OutStreamer->emitRawComment(" %bb." + Twine(MBB.getNumber()) + ":",
2887  false);
2888  }
2889  } else {
2890  OutStreamer->EmitLabel(MBB.getSymbol());
2891  }
2892 }
2893 
2896  setupCodePaddingContext(MBB, Context);
2897  OutStreamer->EmitCodePaddingBasicBlockEnd(Context);
2898 }
2899 
2900 void AsmPrinter::EmitVisibility(MCSymbol *Sym, unsigned Visibility,
2901  bool IsDefinition) const {
2902  MCSymbolAttr Attr = MCSA_Invalid;
2903 
2904  switch (Visibility) {
2905  default: break;
2907  if (IsDefinition)
2908  Attr = MAI->getHiddenVisibilityAttr();
2909  else
2911  break;
2913  Attr = MAI->getProtectedVisibilityAttr();
2914  break;
2915  }
2916 
2917  if (Attr != MCSA_Invalid)
2918  OutStreamer->EmitSymbolAttribute(Sym, Attr);
2919 }
2920 
2921 /// isBlockOnlyReachableByFallthough - Return true if the basic block has
2922 /// exactly one predecessor and the control transfer mechanism between
2923 /// the predecessor and this block is a fall-through.
2924 bool AsmPrinter::
2926  // If this is a landing pad, it isn't a fall through. If it has no preds,
2927  // then nothing falls through to it.
2928  if (MBB->isEHPad() || MBB->pred_empty())
2929  return false;
2930 
2931  // If there isn't exactly one predecessor, it can't be a fall through.
2932  if (MBB->pred_size() > 1)
2933  return false;
2934 
2935  // The predecessor has to be immediately before this block.
2936  MachineBasicBlock *Pred = *MBB->pred_begin();
2937  if (!Pred->isLayoutSuccessor(MBB))
2938  return false;
2939 
2940  // If the block is completely empty, then it definitely does fall through.
2941  if (Pred->empty())
2942  return true;
2943 
2944  // Check the terminators in the previous blocks
2945  for (const auto &MI : Pred->terminators()) {
2946  // If it is not a simple branch, we are in a table somewhere.
2947  if (!MI.isBranch() || MI.isIndirectBranch())
2948  return false;
2949 
2950  // If we are the operands of one of the branches, this is not a fall
2951  // through. Note that targets with delay slots will usually bundle
2952  // terminators with the delay slot instruction.
2953  for (ConstMIBundleOperands OP(MI); OP.isValid(); ++OP) {
2954  if (OP->isJTI())
2955  return false;
2956  if (OP->isMBB() && OP->getMBB() == MBB)
2957  return false;
2958  }
2959  }
2960 
2961  return true;
2962 }
2963 
2964 GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy &S) {
2965  if (!S.usesMetadata())
2966  return nullptr;
2967 
2968  gcp_map_type &GCMap = getGCMap(GCMetadataPrinters);
2969  gcp_map_type::iterator GCPI = GCMap.find(&S);
2970  if (GCPI != GCMap.end())
2971  return GCPI->second.get();
2972 
2973  auto Name = S.getName();
2974 
2977  E = GCMetadataPrinterRegistry::end(); I != E; ++I)
2978  if (Name == I->getName()) {
2979  std::unique_ptr<GCMetadataPrinter> GMP = I->instantiate();
2980  GMP->S = &S;
2981  auto IterBool = GCMap.insert(std::make_pair(&S, std::move(GMP)));
2982  return IterBool.first->second.get();
2983  }
2984 
2985  report_fatal_error("no GCMetadataPrinter registered for GC: " + Twine(Name));
2986 }
2987 
2989  GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
2990  assert(MI && "AsmPrinter didn't require GCModuleInfo?");
2991  bool NeedsDefault = false;
2992  if (MI->begin() == MI->end())
2993  // No GC strategy, use the default format.
2994  NeedsDefault = true;
2995  else
2996  for (auto &I : *MI) {
2997  if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I))
2998  if (MP->emitStackMaps(SM, *this))
2999  continue;
3000  // The strategy doesn't have printer or doesn't emit custom stack maps.
3001  // Use the default format.
3002  NeedsDefault = true;
3003  }
3004 
3005  if (NeedsDefault)
3007 }
3008 
3009 /// Pin vtable to this file.
3011 
3013 
3014 // In the binary's "xray_instr_map" section, an array of these function entries
3015 // describes each instrumentation point. When XRay patches your code, the index
3016 // into this table will be given to your handler as a patch point identifier.
3018  const MCSymbol *CurrentFnSym) const {
3019  Out->EmitSymbolValue(Sled, Bytes);
3020  Out->EmitSymbolValue(CurrentFnSym, Bytes);
3021  auto Kind8 = static_cast<uint8_t>(Kind);
3022  Out->EmitBinaryData(StringRef(reinterpret_cast<const char *>(&Kind8), 1));
3023  Out->EmitBinaryData(
3024  StringRef(reinterpret_cast<const char *>(&AlwaysInstrument), 1));
3025  Out->EmitBinaryData(StringRef(reinterpret_cast<const char *>(&Version), 1));
3026  auto Padding = (4 * Bytes) - ((2 * Bytes) + 3);
3027  assert(Padding >= 0 && "Instrumentation map entry > 4 * Word Size");
3028  Out->EmitZeros(Padding);
3029 }
3030 
3032  if (Sleds.empty())
3033  return;
3034 
3035  auto PrevSection = OutStreamer->getCurrentSectionOnly();
3036  const Function &F = MF->getFunction();
3037  MCSection *InstMap = nullptr;
3038  MCSection *FnSledIndex = nullptr;
3040  auto Associated = dyn_cast<MCSymbolELF>(CurrentFnSym);
3041  assert(Associated != nullptr);
3043  std::string GroupName;
3044  if (F.hasComdat()) {
3045  Flags |= ELF::SHF_GROUP;
3046  GroupName = F.getComdat()->getName();
3047  }
3048 
3049  auto UniqueID = ++XRayFnUniqueID;
3050  InstMap =
3051  OutContext.getELFSection("xray_instr_map", ELF::SHT_PROGBITS, Flags, 0,
3052  GroupName, UniqueID, Associated);
3053  FnSledIndex =
3054  OutContext.getELFSection("xray_fn_idx", ELF::SHT_PROGBITS, Flags, 0,
3055  GroupName, UniqueID, Associated);
3056  } else if (MF->getSubtarget().getTargetTriple().isOSBinFormatMachO()) {
3057  InstMap = OutContext.getMachOSection("__DATA", "xray_instr_map", 0,
3059  FnSledIndex = OutContext.getMachOSection("__DATA", "xray_fn_idx", 0,
3061  } else {
3062  llvm_unreachable("Unsupported target");
3063  }
3064 
3065  auto WordSizeBytes = MAI->getCodePointerSize();
3066 
3067  // Now we switch to the instrumentation map section. Because this is done
3068  // per-function, we are able to create an index entry that will represent the
3069  // range of sleds associated with a function.
3070  MCSymbol *SledsStart = OutContext.createTempSymbol("xray_sleds_start", true);
3071  OutStreamer->SwitchSection(InstMap);
3072  OutStreamer->EmitLabel(SledsStart);
3073  for (const auto &Sled : Sleds)
3074  Sled.emit(WordSizeBytes, OutStreamer.get(), CurrentFnSym);
3075  MCSymbol *SledsEnd = OutContext.createTempSymbol("xray_sleds_end", true);
3076  OutStreamer->EmitLabel(SledsEnd);
3077 
3078  // We then emit a single entry in the index per function. We use the symbols
3079  // that bound the instrumentation map as the range for a specific function.
3080  // Each entry here will be 2 * word size aligned, as we're writing down two
3081  // pointers. This should work for both 32-bit and 64-bit platforms.
3082  OutStreamer->SwitchSection(FnSledIndex);
3083  OutStreamer->EmitCodeAlignment(2 * WordSizeBytes);
3084  OutStreamer->EmitSymbolValue(SledsStart, WordSizeBytes, false);
3085  OutStreamer->EmitSymbolValue(SledsEnd, WordSizeBytes, false);
3086  OutStreamer->SwitchSection(PrevSection);
3087  Sleds.clear();
3088 }
3089 
3091  SledKind Kind, uint8_t Version) {
3092  const Function &F = MI.getMF()->getFunction();
3093  auto Attr = F.getFnAttribute("function-instrument");
3094  bool LogArgs = F.hasFnAttribute("xray-log-args");
3095  bool AlwaysInstrument =
3096  Attr.isStringAttribute() && Attr.getValueAsString() == "xray-always";
3097  if (Kind == SledKind::FUNCTION_ENTER && LogArgs)
3098  Kind = SledKind::LOG_ARGS_ENTER;
3099  Sleds.emplace_back(XRayFunctionEntry{Sled, CurrentFnSym, Kind,
3100  AlwaysInstrument, &F, Version});
3101 }
3102 
3104  return OutStreamer->getContext().getDwarfVersion();
3105 }
3106 
3108  OutStreamer->getContext().setDwarfVersion(Version);
3109 }
virtual void EmitGlobalVariable(const GlobalVariable *GV)
Emit the specified global variable to the .s file.
Definition: AsmPrinter.cpp:435
const Function & getFunction() const
Definition: Function.h:133
void setDwarfVersion(uint16_t Version)
bool isDeclarationForLinker() const
Definition: GlobalValue.h:523
MachineConstantPoolValue * MachineCPVal
uint64_t CallInst * C
StringRef getSection() const
Get the custom section of this global if it has one.
Definition: GlobalObject.h:89
const TargetLoweringObjectFile & getObjFileLowering() const
Return information about object file lowering.
Definition: AsmPrinter.cpp:206
Instances of this class represent a uniqued identifier for a section in the current translation unit...
Definition: MCSection.h:38
IntegerType * getType() const
getType - Specialize the getType() method to always return an IntegerType, which reduces the amount o...
Definition: Constants.h:171
bool doesSetDirectiveSuppressReloc() const
Definition: MCAsmInfo.h:523
void emitInt64(uint64_t Value) const
Emit a long long directive and value.
virtual void EmitStartOfAsmFile(Module &)
This virtual method can be overridden by targets that want to emit something at the start of their fi...
Definition: AsmPrinter.h:383
A parsed version of the target data layout string in and methods for querying it. ...
Definition: DataLayout.h:110
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:583
MCSymbolAttr getHiddenVisibilityAttr() const
Definition: MCAsmInfo.h:553
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:153
bool hasLocalLinkage() const
Definition: GlobalValue.h:435
unsigned getOpcode() const
Return the opcode at the root of this constant expression.
Definition: Constants.h:1209
Special purpose, only applies to global arrays.
Definition: GlobalValue.h:54
uint64_t getZExtValue() const
Get zero extended value.
Definition: APInt.h:1562
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:270
std::unique_ptr< MCStreamer > OutStreamer
This is the MCStreamer object for the file we are generating.
Definition: AsmPrinter.h:93
bool hasDebugInfo() const
Returns true if valid debug info is present.
unsigned getFunctionNumber() const
getFunctionNumber - Return a unique ID for the current function.
MCSymbol * GetExternalSymbolSymbol(StringRef Sym) const
Return the MCSymbol for the specified ExternalSymbol.
static const MCSymbolRefExpr * create(const MCSymbol *Symbol, MCContext &Ctx)
Definition: MCExpr.h:319
static const char *const DbgTimerDescription
Definition: AsmPrinter.cpp:133
MDNode * getOperand(unsigned i) const
Definition: Metadata.cpp:1080
MCTargetOptions MCOptions
Machine level options.
virtual MCSection * getStaticCtorSection(unsigned Priority, const MCSymbol *KeySym) const
bool hasPrivateLinkage() const
Definition: GlobalValue.h:434
const MachineFunction * getMF() const
Return the function that contains the basic block that this instruction belongs to.
const Constant * getInitializer() const
getInitializer - Return the initializer for this global variable.
const std::vector< MCCFIInstruction > & getFrameInstructions() const
Returns a reference to a list of cfi instructions in the function&#39;s prologue.
LLVM_ATTRIBUTE_NORETURN void report_fatal_error(Error Err, bool gen_crash_diag=true)
Report a serious error, calling any installed error handler.
Definition: Error.cpp:139
This class represents lattice values for constants.
Definition: AllocatorList.h:23
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:158
bool isVariable() const
isVariable - Check if this is a variable symbol.
Definition: MCSymbol.h:293
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:39
static bool isGOTEquivalentCandidate(const GlobalVariable *GV, unsigned &NumGOTEquivUsers)
Only consider global GOT equivalents if at least one user is a cstexpr inside an initializer of anoth...
bool hasMachoTBSSDirective() const
Definition: MCAsmInfo.h:473
StringRef getPrivateGlobalPrefix() const
Definition: DataLayout.h:293
MCSymbol - Instances of this class represent a symbol name in the MC file, and MCSymbols are created ...
Definition: MCSymbol.h:41
Not a valid directive.
Definition: MCDirectives.h:19
A Module instance is used to store all the information related to an LLVM module. ...
Definition: Module.h:64
void redefineIfPossible()
Prepare this symbol to be redefined.
Definition: MCSymbol.h:229
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:619
bool doesSupportDebugInformation() const
Definition: MCAsmInfo.h:563
bool hasSingleParameterDotFile() const
Definition: MCAsmInfo.h:539
bool doFinalization(Module &M) override
Shut down the asmprinter.
SmallVector< std::unique_ptr< GCStrategy >, 1 >::const_iterator iterator
Definition: GCMetadata.h:181
Same, but only replaced by something equivalent.
Definition: GlobalValue.h:53
amdgpu Simplify well known AMD library false FunctionCallee Value const Twine & Name
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:602
virtual int getFrameIndexReference(const MachineFunction &MF, int FI, unsigned &FrameReg) const
getFrameIndexReference - This method should return the base register and offset used to reference a f...
MCContext & OutContext
This is the context for the output file that we are streaming.
Definition: AsmPrinter.h:88
virtual const TargetRegisterInfo * getRegisterInfo() const
getRegisterInfo - If register information is available, return it.
bool hasLinkOnceDirective() const
Definition: MCAsmInfo.h:551
LLVM_NODISCARD bool startswith(StringRef Prefix) const
Check if this string starts with the given Prefix.
Definition: StringRef.h:256
unsigned getLoopDepth() const
Return the nesting level of this loop.
Definition: LoopInfo.h:91
Available for inspection, not emission.
Definition: GlobalValue.h:49
unsigned getNumWords() const
Get the number of words.
Definition: APInt.h:1515
unsigned getNumElements() const
Random access to the elements.
Definition: DerivedTypes.h:344
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:587
const MCSubtargetInfo & getSubtargetInfo() const
Return information about subtarget.
Definition: AsmPrinter.cpp:220
DWARF-like instruction based exceptions.
uint16_t getDwarfVersion() const
unsigned getReg() const
getReg - Returns the register number.
CFIMoveType needsCFIMoves() const
Definition: AsmPrinter.cpp:912
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:280
unsigned Reg
bool hasAvailableExternallyLinkage() const
Definition: GlobalValue.h:422
virtual void EmitXXStructor(const DataLayout &DL, const Constant *CV)
Targets can override this to change how global constants that are part of a C++ static/global constru...
Definition: AsmPrinter.h:420
This file contains the declarations for metadata subclasses.
EK_Inline - Jump table entries are emitted inline at their point of use.
format_object< Ts... > format(const char *Fmt, const Ts &... Vals)
These are helper functions used to produce formatted output.
Definition: Format.h:123
virtual const TargetLowering * getTargetLowering() const
raw_ostream & indent(unsigned NumSpaces)
indent - Insert &#39;NumSpaces&#39; spaces.
bool hasDotTypeDotSizeDirective() const
Definition: MCAsmInfo.h:538
bool needsDwarfSectionOffsetDirective() const
Definition: MCAsmInfo.h:466
float convertToFloat() const
Definition: APFloat.h:1097
uint64_t getElementByteSize() const
Return the size (in bytes) of each element in the array/vector.
Definition: Constants.cpp:2450
This file contains the declaration of the Comdat class, which represents a single COMDAT in LLVM...
virtual MCSection * getSectionForCommandLines() const
If supported, return the section to use for the llvm.commandline metadata.
Like Internal, but omit from symbol table.
Definition: GlobalValue.h:56
Externally visible function.
Definition: GlobalValue.h:48
bool IsConstantOffsetFromGlobal(Constant *C, GlobalValue *&GV, APInt &Offset, const DataLayout &DL)
If this constant is a constant offset from a global, return the global and the constant.
#define DEBUG_TYPE
Definition: AsmPrinter.cpp:128
bool hasPrologueData() const
Check whether this function has prologue data.
Definition: Function.h:719
bool isAbsolute() const
Is this an absolute (as opposed to relocatable) value.
Definition: MCValue.h:52
static const char *const DWARFGroupName
Definition: AsmPrinter.cpp:130
bool hasFnAttribute(Attribute::AttrKind Kind) const
Return true if the function has the attribute.
Definition: Function.h:320
A raw_ostream that writes to an SmallVector or SmallString.
Definition: raw_ostream.h:509
virtual void EmitConstantPool()
Print to the current output stream assembly representations of the constants in the constant pool MCP...
bool hasDLLImportStorageClass() const
Definition: GlobalValue.h:261
DebugLoc emitInitialLocDirective(const MachineFunction &MF, unsigned CUID)
Emits inital debug location directive.
STATISTIC(NumFunctions, "Total number of functions")
Metadata node.
Definition: Metadata.h:863
static const MCBinaryExpr * createAnd(const MCExpr *LHS, const MCExpr *RHS, MCContext &Ctx)
Definition: MCExpr.h:462
unsigned getProgramPointerSize() const
F(f)
MachineFunction * MF
The current machine function.
Definition: AsmPrinter.h:96
setjmp/longjmp based exceptions
SmallVector< HandlerInfo, 1 > Handlers
A vector of all debug/EH info emitters we should use.
Definition: AsmPrinter.h:157
const MDOperand & getOperand(unsigned I) const
Definition: Metadata.h:1068
ELFYAML::ELF_STV Visibility
Definition: ELFYAML.cpp:808
APInt zextOrTrunc(unsigned width) const
Zero extend or truncate to width.
Definition: APInt.cpp:875
virtual void emitLinkerFlagsForUsed(raw_ostream &OS, const GlobalValue *GV) const
static const MCBinaryExpr * createMul(const MCExpr *LHS, const MCExpr *RHS, MCContext &Ctx)
Definition: MCExpr.h:512
std::pair< const GlobalVariable *, unsigned > GOTEquivUsePair
Map global GOT equivalent MCSymbols to GlobalVariables and keep track of its number of uses by other ...
Definition: AsmPrinter.h:121
static void emitKill(const MachineInstr *MI, AsmPrinter &AP)
Definition: AsmPrinter.cpp:784
static const char *const DWARFGroupDescription
Definition: AsmPrinter.cpp:131
bool isImm() const
isImm - Tests if this is a MO_Immediate operand.
bool hasIdentDirective() const
Definition: MCAsmInfo.h:540
bool isPPC_FP128Ty() const
Return true if this is powerpc long double.
Definition: Type.h:158
virtual void EmitDebugValue(const MCExpr *Value, unsigned Size) const
Emit the directive and value for debug thread local expression.
Definition: AsmPrinter.cpp:633
DenseMap< GCStrategy *, std::unique_ptr< GCMetadataPrinter > > gcp_map_type
Definition: AsmPrinter.cpp:146
Tentative definitions.
Definition: GlobalValue.h:58
unsigned getBitWidth() const
getBitWidth - Return the bitwidth of this constant.
Definition: Constants.h:142
virtual void EmitInstruction(const MCInst &Inst, const MCSubtargetInfo &STI)
Emit the given Instruction into the current section.
Definition: MCStreamer.cpp:955
bool hasMachoZeroFillDirective() const
Definition: MCAsmInfo.h:472
WinEH::EncodingType getWinEHEncodingType() const
Definition: MCAsmInfo.h:570
bool canBeOmittedFromSymbolTable() const
True if GV can be left out of the object symbol table.
Definition: Globals.cpp:288
unsigned getBitWidth() const
Return the number of bits in the APInt.
Definition: APInt.h:1508
Constant * getPrologueData() const
Get the prologue data associated with this function.
Definition: Function.cpp:1322
MCSectionCOFF * getCOFFSection(StringRef Section, unsigned Characteristics, SectionKind Kind, StringRef COMDATSymName, int Selection, unsigned UniqueID=GenericSectionID, const char *BeginSymName=nullptr)
Definition: MCContext.cpp:421
virtual MCSection * getStaticDtorSection(unsigned Priority, const MCSymbol *KeySym) const
const Triple & getTargetTriple() const
This represents a section on Windows.
Definition: MCSectionCOFF.h:26
std::pair< iterator, bool > insert(const std::pair< KeyT, ValueT > &KV)
Definition: DenseMap.h:221
The address of a basic block.
Definition: Constants.h:839
.cold (MachO)
Definition: MCDirectives.h:22
void emit(DiagnosticInfoOptimizationBase &OptDiag)
Emit an optimization remark.
static const MCBinaryExpr * createXor(const MCExpr *LHS, const MCExpr *RHS, MCContext &Ctx)
Definition: MCExpr.h:547
bool hasSection() const
Definition: GlobalValue.h:269
AnalysisUsage & addRequired()
int64_t getConstant() const
Definition: MCValue.h:46
Used to lazily calculate structure layout information for a target machine, based on the DataLayout s...
Definition: DataLayout.h:531
void recordSled(MCSymbol *Sled, const MachineInstr &MI, SledKind Kind, uint8_t Version=0)
const MCSymbolRefExpr * getSymB() const
Definition: MCValue.h:48
static void emitGlobalConstantFP(const ConstantFP *CFP, AsmPrinter &AP)
A tuple of MDNodes.
Definition: Metadata.h:1325
bool hasPrefixData() const
Check whether this function has prefix data.
Definition: Function.h:710
static Constant * getIntegerCast(Constant *C, Type *Ty, bool isSigned)
Create a ZExt, Bitcast or Trunc for integer -> integer casts.
Definition: Constants.cpp:1612
Definition: BitVector.h:937
Emits exception handling directives.
Definition: EHStreamer.h:30
SymbolListTy GetGVStubList()
Accessor methods to return the set of stubs in sorted order.
StringRef getName() const
MCSymbol * createLinkerPrivateTempSymbol()
Create and return a new linker temporary symbol with a unique but unspecified name.
Definition: MCContext.cpp:210
bool isMachineConstantPoolEntry() const
isMachineConstantPoolEntry - Return true if the MachineConstantPoolEntry is indeed a target specific ...
Type * getPointerElementType() const
Definition: Type.h:375
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:369
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:387
Twine - A lightweight data structure for efficiently representing the concatenation of temporary valu...
Definition: Twine.h:80
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:390
MachineModuleInfoCOFF - This is a MachineModuleInfoImpl implementation for COFF targets.
const ConstantFP * getFPImm() const
unsigned getNumOperands() const
Retuns the total number of operands.
Definition: MachineInstr.h:411
Printable printReg(unsigned Reg, const TargetRegisterInfo *TRI=nullptr, unsigned SubIdx=0, const MachineRegisterInfo *MRI=nullptr)
Prints virtual and physical registers with or without a TRI instance.
StringRef getRawDataValues() const
Return the raw, underlying, bytes of this data.
Definition: Constants.cpp:2424
Class to represent struct types.
Definition: DerivedTypes.h:232
This class is basically a combination of TimeRegion and Timer.
Definition: Timer.h:160
bool isConstant() const
If the value is a global constant, its value is immutable throughout the runtime execution of the pro...
virtual void emitModuleMetadata(MCStreamer &Streamer, Module &M) const
Emit the module-level metadata that the platform cares about.
static const MCBinaryExpr * createDiv(const MCExpr *LHS, const MCExpr *RHS, MCContext &Ctx)
Definition: MCExpr.h:467
Base class for the full range of assembler expressions which are needed for parsing.
Definition: MCExpr.h:35
bool hasAtLeastLocalUnnamedAddr() const
Returns true if this value&#39;s address is not significant in this module.
Definition: GlobalValue.h:208
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...
unsigned getNumOperands() const
Definition: Metadata.cpp:1076
bool hasVarSizedObjects() const
This method may be called any time after instruction selection is complete to determine if the stack ...
void getNameWithPrefix(SmallVectorImpl< char > &Name, const GlobalValue *GV, Mangler &Mang, bool MayAlwaysUsePrivate=false) const
bool getCommDirectiveSupportsAlignment() const
MCSection * getBSSSection() const
SmallVector< XRayFunctionEntry, 4 > Sleds
Definition: AsmPrinter.h:267
.local (ELF)
Definition: MCDirectives.h:35
An analysis pass which caches information about the entire Module.
Definition: GCMetadata.h:152
MCSection * getDataSection() const
MCSection * getStackSizesSection(const MCSection &TextSec) const
const char * getWeakRefDirective() const
Definition: MCAsmInfo.h:544
uint64_t getNumElements() const
Definition: DerivedTypes.h:390
.no_dead_strip (MachO)
Definition: MCDirectives.h:36
LLVM_NODISCARD bool empty() const
empty - Check if the string is empty.
Definition: StringRef.h:126
This class defines information used to lower LLVM code to legal SelectionDAG operators that the targe...
unsigned getCFIIndex() const
This file implements a class to represent arbitrary precision integral constant values and operations...
bool hasCommonLinkage() const
Definition: GlobalValue.h:439
INLINEASM - Represents an inline asm block.
Definition: ISDOpcodes.h:668
Constant * getPrefixData() const
Get the prefix data associated with this function.
Definition: Function.cpp:1312
BlockT * getHeader() const
Definition: LoopInfo.h:99
static const char *const CodeViewLineTablesGroupName
Definition: AsmPrinter.cpp:138
unsigned getPointerSize() const
Return the pointer size from the TargetMachine.
Definition: AsmPrinter.cpp:216
Optional< unsigned > getFoldedRestoreSize(const TargetInstrInfo *TII) const
Return a valid size if the instruction is a folded restore instruction.
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:62
auto reverse(ContainerTy &&C, typename std::enable_if< has_rbegin< ContainerTy >::value >::type *=nullptr) -> decltype(make_range(C.rbegin(), C.rend()))
Definition: STLExtras.h:266
bool hasExternalLinkage() const
Definition: GlobalValue.h:421
unsigned getEntryAlignment(const DataLayout &TD) const
getEntryAlignment - Return the alignment of each entry in the jump table.
Constant * ConstantFoldConstant(const Constant *C, const DataLayout &DL, const TargetLibraryInfo *TLI=nullptr)
ConstantFoldConstant - Attempt to fold the constant using the specified DataLayout.
static bool needFuncLabelsForEHOrDebugInfo(const MachineFunction &MF, MachineModuleInfo *MMI)
Definition: AsmPrinter.cpp:987
static const MCBinaryExpr * createShl(const MCExpr *LHS, const MCExpr *RHS, MCContext &Ctx)
Definition: MCExpr.h:527
void getAnalysisUsage(AnalysisUsage &AU) const override
Record analysis usage.
Definition: AsmPrinter.cpp:240
bool isNullValue() const
Return true if this is the value that would be returned by getNullValue.
Definition: Constants.cpp:84
A constant value that is initialized with an expression using other constant values.
Definition: Constants.h:888
void EmitFunctionBody()
This method emits the body and trailer for a function.
int64_t getSExtValue() const
Get sign extended value.
Definition: APInt.h:1574
static void emitComments(const MachineInstr &MI, raw_ostream &CommentOS)
emitComments - Pretty-print comments for instructions.
Definition: AsmPrinter.cpp:744
const std::string & getName() const
Return the name of the GC strategy.
Definition: GCStrategy.h:86
Type * getType() const
All values are typed, get the type of this value.
Definition: Value.h:244
opStatus convert(const fltSemantics &ToSemantics, roundingMode RM, bool *losesInfo)
Definition: APFloat.cpp:4443
static const MCBinaryExpr * createSub(const MCExpr *LHS, const MCExpr *RHS, MCContext &Ctx)
Definition: MCExpr.h:542
MCSymbol * getFunctionBegin() const
Definition: AsmPrinter.h:208
MCSectionMachO * getMachOSection(StringRef Segment, StringRef Section, unsigned TypeAndAttributes, unsigned Reserved2, SectionKind K, const char *BeginSymName=nullptr)
Return the MCSection for the specified mach-o section.
Definition: MCContext.cpp:272
void toString(SmallVectorImpl< char > &Str, unsigned FormatPrecision=0, unsigned FormatMaxPadding=3, bool TruncateZero=true) const
Definition: APFloat.h:1166
ConstantDataSequential - A vector or array constant whose element type is a simple 1/2/4/8-byte integ...
Definition: Constants.h:573
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:197
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
Optional< unsigned > getRestoreSize(const TargetInstrInfo *TII) const
Return a valid size if the instruction is a restore instruction.
VisibilityTypes
An enumeration for the kinds of visibility of global values.
Definition: GlobalValue.h:62
.alt_entry (MachO)
Definition: MCDirectives.h:38
NamedMDNode * getNamedMetadata(const Twine &Name) const
Return the first NamedMDNode in the module with the specified name.
Definition: Module.cpp:250
bool isBSSLocal() const
Definition: SectionKind.h:160
EK_BlockAddress - Each entry is a plain address of block, e.g.
LLVM_NODISCARD size_t size() const
size - Get the string size.
Definition: StringRef.h:130
const APInt & getValue() const
Return the constant as an APInt value reference.
Definition: Constants.h:137
BasicBlock * getBasicBlock() const
Definition: Constants.h:866
bool isFPImm() const
isFPImm - Tests if this is a MO_FPImmediate operand.
bool hasFunctionAlignment() const
Definition: MCAsmInfo.h:537
bool hasPersonalityFn() const
Check whether this function has a personality function.
Definition: Function.h:701
This class is a data container for one entry in a MachineConstantPool.
virtual const MCExpr * LowerCustomJumpTableEntry(const MachineJumpTableInfo *, const MachineBasicBlock *, unsigned, MCContext &) const
int getNumber() const
MachineBasicBlocks are uniquely numbered at the function level, unless they&#39;re not in a MachineFuncti...
LinkageTypes getLinkage() const
Definition: GlobalValue.h:450
virtual void EmitBinaryData(StringRef Data)
Functionally identical to EmitBytes.
Protected struct HandlerInfo and Handlers permit target extended AsmPrinter adds their own handlers...
Definition: AsmPrinter.h:140
virtual const TargetInstrInfo * getInstrInfo() const
static const fltSemantics & IEEEdouble() LLVM_READNONE
Definition: APFloat.cpp:122
StringRef getTargetCPU() const
ArrayRef< MCSymbol * > getAddrLabelSymbolToEmit(const BasicBlock *BB)
Return the symbol to be used for the specified basic block when its address is taken.
unsigned getAlignment() const
Definition: Globals.cpp:96
void printOffset(int64_t Offset, raw_ostream &OS) const
This is just convenient handler for printing offsets.
static const MCBinaryExpr * createAdd(const MCExpr *LHS, const MCExpr *RHS, MCContext &Ctx)
Definition: MCExpr.h:457
bool hasLinkOnceLinkage() const
Definition: GlobalValue.h:425
bool isVerbose() const
Return true if assembly output should contain comments.
Definition: AsmPrinter.h:199
bool hasNoDeadStrip() const
Definition: MCAsmInfo.h:541
const std::string & str() const
Definition: Triple.h:358
Type * getElementType() const
Return the element type of the array/vector.
Definition: Constants.cpp:2420
void emitGlobalGOTEquivs()
Constant expressions using GOT equivalent globals may not be eligible for PC relative GOT entry conve...
MachineModuleInfo * MMI
This is a pointer to the current MachineModuleInfo.
Definition: AsmPrinter.h:99
Value * getOperand(unsigned i) const
Definition: User.h:169
Instances of this class represent a single low-level machine instruction.
Definition: MCInst.h:158
const DataLayout & getDataLayout() const
Return the DataLayout attached to the Module associated to this MF.
static void handleIndirectSymViaGOTPCRel(AsmPrinter &AP, const MCExpr **ME, const Constant *BaseCst, uint64_t Offset)
Transform a not absolute MCExpr containing a reference to a GOT equivalent global, by a target specific GOT pc relative access to the final symbol.
const std::string & getSourceFileName() const
Get the module&#39;s original source file name.
Definition: Module.h:220
static bool canBeHidden(const GlobalValue *GV, const MCAsmInfo &MAI)
Definition: AsmPrinter.cpp:377
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:468
StringRef getName() const
TargetInstrInfo - Interface to description of machine instruction set.
bool hasAppendingLinkage() const
Definition: GlobalValue.h:432
iterator find(const_arg_type_t< KeyT > Val)
Definition: DenseMap.h:176
Windows Exception Handling.
This class is intended to be used as a base class for asm properties and features specific to the tar...
Definition: MCAsmInfo.h:55
===- MachineOptimizationRemarkEmitter.h - Opt Diagnostics -*- C++ -*-—===//
MCSection * getTLSExtraDataSection() const
bool useEmulatedTLS() const
Returns true if this target uses emulated TLS.
bool isOSWindows() const
Tests whether the OS is Windows.
Definition: Triple.h:527
bool isFloatTy() const
Return true if this is &#39;float&#39;, a 32-bit IEEE fp type.
Definition: Type.h:146
ExternalWeak linkage description.
Definition: GlobalValue.h:57
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:427
Optional< unsigned > getSpillSize(const TargetInstrInfo *TII) const
Return a valid size if the instruction is a spill instruction.
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:801
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:749
unsigned getPreferredAlignmentLog(const GlobalVariable *GV) const
Returns the preferred alignment of the specified global, returned in log form.
Definition: DataLayout.cpp:855
#define P(N)
.data_region jt32
Definition: MCDirectives.h:60
Same, but only replaced by something equivalent.
Definition: GlobalValue.h:51
EK_GPRel64BlockAddress - Each entry is an address of block, encoded with a relocation as gp-relative...
void EmitZeros(uint64_t NumBytes)
Emit NumBytes worth of zeros.
Definition: MCStreamer.cpp:200
Streaming machine code generation interface.
Definition: MCStreamer.h:188
virtual void EmitFunctionBodyEnd()
Targets can override this to emit stuff after the last basic block in the function.
Definition: AsmPrinter.h:395
static const char *const EHTimerDescription
Definition: AsmPrinter.cpp:135
StringRef getName() const
Definition: Comdat.cpp:26
MCSymbol * createTempSymbol(bool CanBeUnnamed=true)
Create and return a new assembler temporary symbol with a unique but unspecified name.
Definition: MCContext.cpp:216
EK_Custom32 - Each entry is a 32-bit value that is custom lowered by the TargetLowering::LowerCustomJ...
CodeGenOpt::Level getOptLevel() const
Returns the optimization level: None, Less, Default, or Aggressive.
.weak_def_can_be_hidden (MachO)
Definition: MCDirectives.h:45
VisibilityTypes getVisibility() const
Definition: GlobalValue.h:232
MCSymbol * CurrentFnSym
The symbol for the current function.
Definition: AsmPrinter.h:112
bool getAsmPrinterFlag(CommentFlag Flag) const
Return whether an AsmPrinter flag is set.
Definition: MachineInstr.h:274
LLVM Basic Block Representation.
Definition: BasicBlock.h:57
const FunctionListType & getFunctionList() const
Get the Module&#39;s list of functions (constant).
Definition: Module.h:532
const MCAsmInfo * MAI
Target Asm Printer information.
Definition: AsmPrinter.h:84
The instances of the Type class are immutable: once they are created, they are never changed...
Definition: Type.h:45
const TargetSubtargetInfo & getSubtarget() const
getSubtarget - Return the subtarget for which this machine code is being compiled.
virtual bool shouldPutJumpTableInFunctionSection(bool UsesLabelDifference, const Function &F) const
void takeDeletedSymbolsForFunction(const Function *F, std::vector< MCSymbol *> &Result)
If the specified function has had any references to address-taken blocks generated, but the block got deleted, return the symbol now so we can emit it.
void getAnalysisUsage(AnalysisUsage &AU) const override
getAnalysisUsage - Subclasses that override getAnalysisUsage must call this.
virtual void emitLinkerFlagsForGlobal(raw_ostream &OS, const GlobalValue *GV) const
bool isOSBinFormatCOFF() const
Tests whether the OS uses the COFF binary format.
Definition: Triple.h:607
AsmPrinter(TargetMachine &TM, std::unique_ptr< MCStreamer > Streamer)
Definition: AsmPrinter.cpp:180
Metadata * getModuleFlag(StringRef Key) const
Return the corresponding value if Key appears in module flags, otherwise return null.
Definition: Module.cpp:310
MachineFrameInfo & getFrameInfo()
getFrameInfo - Return the frame info object for the current function.
bool needsLocalForSize() const
Definition: MCAsmInfo.h:489
static GCRegistry::Add< CoreCLRGC > E("coreclr", "CoreCLR-compatible GC")
This is an important base class in LLVM.
Definition: Constant.h:41
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:628
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:263
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:370
MCSymbol * getSymbol(const GlobalValue *GV) const
void EmitAlignment(unsigned NumBits, const GlobalObject *GV=nullptr) const
Emit an alignment directive to the specified power of two boundary.
static const MCBinaryExpr * createOr(const MCExpr *LHS, const MCExpr *RHS, MCContext &Ctx)
Definition: MCExpr.h:522
unsigned getAlignment() const
Return alignment of the basic block.
unsigned EmitStackSizeSection
Emit section containing metadata on function stack sizes.
double convertToDouble() const
Definition: APFloat.h:1096
TargetMachine & TM
Target machine description.
Definition: AsmPrinter.h:81
This class is intended to be used as a driving class for all asm writers.
Definition: AsmPrinter.h:78
bool isCImm() const
isCImm - Test if this is a MO_CImmediate operand.
void getNameWithPrefix(SmallVectorImpl< char > &Name, const GlobalValue *GV) const
Definition: AsmPrinter.cpp:425
EHPersonality classifyEHPersonality(const Value *Pers)
See if the given exception handling personality function is one that we understand.
MCSymbol * getSymbolWithGlobalValueBase(const GlobalValue *GV, StringRef Suffix, const TargetMachine &TM) const
Return the MCSymbol for a private symbol with global value name as its base, with the specified suffi...
Represent the analysis usage information of a pass.
This file declares a class to represent arbitrary precision floating point values and provide a varie...
const MCSymbolRefExpr * getSymA() const
Definition: MCValue.h:47
bool optForSize() const
Optimize this function for size (-Os) or minimum size (-Oz).
Definition: Function.h:597
const DILabel * getDebugLabel() const
Return the debug label referenced by this DBG_LABEL instruction.
bool hasWeakDefCanBeHiddenDirective() const
Definition: MCAsmInfo.h:547
static bool isDiscardableIfUnused(LinkageTypes Linkage)
Whether the definition of this global may be discarded if it is not used in its compilation unit...
Definition: GlobalValue.h:360
MCSymbol * getJTISymbol(unsigned JTI, MCContext &Ctx, bool isLinkerPrivate=false) const
getJTISymbol - Return the MCSymbol for the specified non-empty jump table.
SectionKind - This is a simple POD value that classifies the properties of a section.
Definition: SectionKind.h:22
LCOMM::LCOMMType getLCOMMDirectiveAlignmentType() const
Definition: MCAsmInfo.h:533
const Triple & getTargetTriple() const
bool useAssignmentForEHBegin() const
Definition: MCAsmInfo.h:488
op_range operands()
Definition: User.h:237
bool hasLinkerPrivateGlobalPrefix() const
Definition: DataLayout.h:271
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:81
~AsmPrinter() override
Definition: AsmPrinter.cpp:186
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:499
MachineConstantPool * getConstantPool()
getConstantPool - Return the constant pool object for the current function.
bool hasSubsectionsViaSymbols() const
Definition: MCAsmInfo.h:409
void emitFrameAlloc(const MachineInstr &MI)
Definition: AsmPrinter.cpp:952
.weak_reference (MachO)
Definition: MCDirectives.h:44
bool isOSBinFormatMachO() const
Tests whether the environment is MachO.
Definition: Triple.h:612
void computeGlobalGOTEquivs(Module &M)
Unnamed constant global variables solely contaning a pointer to another globals variable act like a g...
const Target & getTarget() const
static const char *const EHTimerName
Definition: AsmPrinter.cpp:134
bool hasWeakDefDirective() const
Definition: MCAsmInfo.h:545
bool isSplat(unsigned SplatSizeInBits) const
Check if the APInt consists of a repeated bit pattern.
Definition: APInt.cpp:501
void emitStackMaps(StackMaps &SM)
Emit the stack maps.
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:529
Abstract base class for all machine specific constantpool value subclasses.
static void emitGlobalConstantVector(const DataLayout &DL, const ConstantVector *CV, AsmPrinter &AP)
size_t size() const
Definition: SmallVector.h:52
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:1206
Optional< unsigned > getFoldedSpillSize(const TargetInstrInfo *TII) const
Return a valid size if the instruction is a folded spill instruction.
virtual MCSymbol * GetCPISymbol(unsigned CPID) const
Return the symbol for the specified constant pool entry.
unsigned getDwarfVersion() const
Returns the Dwarf Version by checking module flags.
Definition: Module.cpp:461
virtual void markFunctionEnd()
bool isThreadBSS() const
Definition: SectionKind.h:152
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:4269
std::string & str()
Flushes the stream contents to the target string and returns the string&#39;s reference.
Definition: raw_ostream.h:498
#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:43
MCSection * getDrectveSection() const
EH_LABEL - Represents a label in mid basic block used to track locations needed for debug and excepti...
Definition: ISDOpcodes.h:676
void serializeToStackMapSection()
If there is any stack map data, create a stack map section and serialize the map info into it...
Definition: StackMaps.cpp:548
unsigned getPointerSize(unsigned AS) const
Get the pointer size for this target.
iterator_range< expr_op_iterator > expr_ops() const
bool hasWeakLinkage() const
Definition: GlobalValue.h:429
bool isBSS() const
Definition: SectionKind.h:159
const std::vector< MachineConstantPoolEntry > & getConstants() const
const APFloat & getValueAPF() const
Definition: Constants.h:302
bool hasAddressTaken() const
Returns true if there are any uses of this basic block other than direct branches, switches, etc.
Definition: BasicBlock.h:391
unsigned getFunctionNumber() const
Return a unique ID for the current function.
Definition: AsmPrinter.cpp:202
const std::vector< LandingPadInfo > & getLandingPads() const
Return a reference to the landing pad info for the current function.
unsigned getNumOperands() const
Definition: User.h:191
void emitCFIInstruction(const MachineInstr &MI)
Definition: AsmPrinter.cpp:927
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:772
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:417
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:250
unsigned Alignment
The required alignment for this entry.
This is the shared class of boolean and integer constants.
Definition: Constants.h:83
static iterator begin()
virtual TargetLoweringObjectFile * getObjFileLowering() const
SymbolListTy GetGVStubList()
Accessor methods to return the set of stubs in sorted order.
MapVector< const MCSymbol *, GOTEquivUsePair > GlobalGOTEquivs
Definition: AsmPrinter.h:122
virtual const MCExpr * getIndirectSymViaGOTPCRel(const MCSymbol *Sym, const MCValue &MV, int64_t Offset, MachineModuleInfo *MMI, MCStreamer &Streamer) const
Get the target specific PC relative GOT entry relocation.
virtual bool isVirtualSection() const =0
Check whether this section is "virtual", that is has no actual object file contents.
static const char *const CodeViewLineTablesGroupDescription
Definition: AsmPrinter.cpp:139
MCSymbol * getSymbol(const GlobalValue *GV) const
Definition: AsmPrinter.cpp:430
const MCSymbol & getSymbol() const
Definition: MCExpr.h:332
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:407
bool isUndefined(bool SetUsed=true) const
isUndefined - Check if this symbol undefined (i.e., implicitly defined).
Definition: MCSymbol.h:256
MachineOperand class - Representation of each machine instruction operand.
bool isCommon() const
Definition: SectionKind.h:163
This is a &#39;vector&#39; (really, a variable-sized array), optimized for the case when the array is small...
Definition: SmallVector.h:839
Keep one copy of function when linking (inline)
Definition: GlobalValue.h:50
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:2679
StringRef getAsString() const
If this array is isString(), then this method returns the array as a StringRef.
Definition: Constants.h:655
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:703
unsigned EmitAddrsig
Emit address-significance table.
Information about stack frame layout on the target.
const DataFlowGraph & G
Definition: RDFGraph.cpp:210
void EmitToStreamer(MCStreamer &S, const MCInst &Inst)
Definition: AsmPrinter.cpp:225
bool EmitSpecialLLVMGlobal(const GlobalVariable *GV)
Check to see if the specified global is a special global used by LLVM.
static SectionKind getReadOnlyWithRel()
Definition: SectionKind.h:202
uint64_t getSizeInBytes() const
Definition: DataLayout.h:539
StringRef str()
Return a StringRef for the vector contents.
Definition: raw_ostream.h:534
bool usesMetadata() const
If set, appropriate metadata tables must be emitted by the back-end (assembler, JIT, or otherwise).
Definition: GCStrategy.h:117
bool hasGlobalUnnamedAddr() const
Definition: GlobalValue.h:199
void emitInt32(int Value) const
Emit a long directive and value.
MCSymbolAttr
Definition: MCDirectives.h:18
void print(raw_ostream &OS, bool isSigned) const
Definition: APInt.cpp:2170
int64_t getImm() const
MachineDominatorTree * MDT
This is a pointer to the current MachineLoopInfo.
Definition: AsmPrinter.h:102
unsigned pred_size() const
bool isLayoutSuccessor(const MachineBasicBlock *MBB) const
Return true if the specified MBB will be emitted immediately after this block, such that if this bloc...
DWARF expression.
const Function & getFunction() const
Return the LLVM function that this machine code represents.
Collects and handles line tables information in a CodeView format.
Definition: CodeViewDebug.h:51
bool needsUnwindTableEntry() const
True if this function needs an unwind table.
Definition: Function.h:572
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:538
This file contains constants used for implementing Dwarf debug support.
bool isDefined() const
isDefined - Check if this symbol is defined (i.e., it has an address).
Definition: MCSymbol.h:247
Target - Wrapper for Target specific information.
Class for arbitrary precision integers.
Definition: APInt.h:69
ConstantArray - Constant Array Declarations.
Definition: Constants.h:413
static StringRef dropLLVMManglingEscape(StringRef Name)
If the given string begins with the GlobalValue name mangling escape character &#39;\1&#39;, drop it.
Definition: GlobalValue.h:471
virtual void EmitFunctionBodyStart()
Targets can override this to emit stuff before the first basic block in the function.
Definition: AsmPrinter.h:391
MCSymbol * getCurExceptionSym()
LinkageTypes
An enumeration for the kinds of linkage for global values.
Definition: GlobalValue.h:47
unsigned getEntrySize(const DataLayout &TD) const
getEntrySize - Return the size of each entry in the jump table.
void setPreservesAll()
Set by analyses that do not transform their input at all.
iterator_range< user_iterator > users()
Definition: Value.h:399
unsigned getNumElements() const
bool hasComdat() const
Definition: GlobalObject.h:99
ArrayType * getType() const
Specialize the getType() method to always return an ArrayType, which reduces the amount of casting ne...
Definition: Constants.h:432
MCSubtargetInfo * createMCSubtargetInfo(StringRef TheTriple, StringRef CPU, StringRef Features) const
createMCSubtargetInfo - Create a MCSubtargetInfo implementation.
FunctionNumber(functionNumber)
Definition: LLParser.cpp:2736
iterator end() const
Definition: GCMetadata.h:195
const MachineBasicBlock * getParent() const
Definition: MachineInstr.h:253
MachineModuleInfoELF - This is a MachineModuleInfoImpl implementation for ELF targets.
static bool emitDebugLabelComment(const MachineInstr *MI, AsmPrinter &AP)
This method handles the target-independent form of DBG_LABEL, returning true if it was able to do so...
Definition: AsmPrinter.cpp:891
Iterators for registry entries.
Definition: Registry.h:83
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:674
const Comdat * getComdat() const
Definition: GlobalObject.h:100
uint64_t getTypeAllocSize(Type *Ty) const
Returns the offset in bytes between successive objects of the specified type, including alignment pad...
Definition: DataLayout.h:438
LoopT * getParentLoop() const
Definition: LoopInfo.h:100
MachineLoopInfo * MLI
This is a pointer to the current MachineLoopInfo.
Definition: AsmPrinter.h:105
Representation of each machine instruction.
Definition: MachineInstr.h:63
static const char *const CFGuardName
Definition: AsmPrinter.cpp:136
static void emitGlobalConstantImpl(const DataLayout &DL, const Constant *C, AsmPrinter &AP, const Constant *BaseCV=nullptr, uint64_t Offset=0)
void emitInitialRawDwarfLocDirective(const MachineFunction &MF)
Emits inital debug location directive.
Definition: AsmPrinter.cpp:229
bool doInitialization(Module &M) override
Set up the AsmPrinter when we are working on a new module.
Definition: AsmPrinter.cpp:248
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:66
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:214
MCSymbol * GetJTISymbol(unsigned JTID, bool isLinkerPrivate=false) const
Return the symbol for the specified jump table entry.
uint64_t getElementOffset(unsigned Idx) const
Definition: DataLayout.h:553
SequentialType * getType() const
Specialize the getType() method to always return a SequentialType, which reduces the amount of castin...
Definition: Constants.h:632
APFloat getElementAsAPFloat(unsigned i) const
If this is a sequential container of floating point type, return the specified element as an APFloat...
Definition: Constants.cpp:2727
StringRef filename(StringRef path, Style style=Style::native)
Get filename.
Definition: Path.cpp:589
.type _foo,
Definition: MCDirectives.h:30
MCSymbol * getOrCreateSymbol(const Twine &Name)
Lookup the symbol inside with the specified Name.
Definition: MCContext.cpp:122
iterator begin() const
begin/end - Iterators for used strategies.
Definition: GCMetadata.h:194
void print(raw_ostream &O, bool IsForDebug=false, bool NoDetails=false) const
Print the current type.
Definition: AsmWriter.cpp:4166
bool isEHPad() const
Returns true if the block is a landing pad.
Represents a single loop in the control flow graph.
Definition: LoopInfo.h:464
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:521
.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:214
TargetOptions Options
Definition: TargetMachine.h:96
virtual ~AsmPrinterHandler()
Pin vtable to this file.
const NodeList & List
Definition: RDFGraph.cpp:209
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.
virtual const TargetFrameLowering * getFrameLowering() const
bool isFI() const
isFI - Tests if this is a MO_FrameIndex operand.
iterator end()
Definition: DenseMap.h:108
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:148
static const MCBinaryExpr * createMod(const MCExpr *LHS, const MCExpr *RHS, MCContext &Ctx)
Definition: MCExpr.h:507
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:322
static const char *const CFGuardDescription
Definition: AsmPrinter.cpp:137
uint32_t Size
Definition: Profile.cpp:46
bool hasAltEntry() const
Definition: MCAsmInfo.h:542
Keep one copy of named function when linking (weak)
Definition: GlobalValue.h:52
Rename collisions when linking (static functions).
Definition: GlobalValue.h:55
const Constant * getIndirectSymbol() const
const LLVMTargetMachine & getTarget() const
getTarget - Return the target machine this machine code is compiled with
.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:157
virtual void EmitFunctionEntryLabel()
EmitFunctionEntryLabel - Emit the label that is the entrypoint for the function.
Definition: AsmPrinter.cpp:728
const Module * getModule() const
bool isReg() const
isReg - Tests if this is a MO_Register operand.
std::vector< std::pair< MCSymbol *, StubValueTy > > SymbolListTy
const std::string & getModuleInlineAsm() const
Get any module-scope inline assembly blocks.
Definition: Module.h:247
const GlobalObject * getBaseObject() const
Definition: Globals.cpp:260
bool isDeclaration() const
Return true if the primary definition of this global value is outside of the current translation unit...
Definition: Globals.cpp:205
bool empty() const
Definition: LoopInfo.h:145
StringRef getName() const
getName - Get the symbol name.
Definition: MCSymbol.h:202
unsigned getCodePointerSize() const
Get the code pointer size in bytes.
Definition: MCAsmInfo.h:395
DILocalScope * getScope() const
Get the local scope for this label.
assert(ImpDefSCC.getReg()==AMDGPU::SCC &&ImpDefSCC.isDef())
INLINEASM_BR - Terminator version of inline asm. Used by asm-goto.
Definition: ISDOpcodes.h:671
A raw_ostream that writes to an std::string.
Definition: raw_ostream.h:482
MCSectionELF * getELFSection(const Twine &Section, unsigned Type, unsigned Flags)
Definition: MCContext.h:388
MCSymbol * getMCSymbol() const
void EmitGlobalConstant(const DataLayout &DL, const Constant *CV)
Print a general LLVM constant to the .s file.
void emitInt8(int Value) const
Emit a byte directive and value.
Module * getParent()
Get the module that this global value is contained inside of...
Definition: GlobalValue.h:565
LLVM Value Representation.
Definition: Value.h:72
Constant * getPersonalityFn() const
Get the personality function associated with this function.
Definition: Function.cpp:1302
JTEntryKind getEntryKind() const
uint64_t getTypeStoreSize(Type *Ty) const
Returns the maximum number of bytes that may be overwritten by storing the specified type...
Definition: DataLayout.h:421
bool isThreadLocal() const
Definition: SectionKind.h:148
bool hasInitializer() const
Definitions have initializers, declarations don&#39;t.
MachineLoop * getLoopFor(const MachineBasicBlock *BB) const
Return the innermost loop that BB lives in.
ExceptionHandling
Windows CE ARM, PowerPC, SH3, SH4.
static const char *const DbgTimerName
Definition: AsmPrinter.cpp:132
#define LLVM_FALLTHROUGH
LLVM_FALLTHROUGH - Mark fallthrough cases in switch statements.
Definition: Compiler.h:250
const DILocalVariable * getDebugVariable() const
Return the debug variable referenced by this DBG_VALUE instruction.
ExceptionHandling getExceptionHandlingType() const
Definition: MCAsmInfo.h:569
Attribute getFnAttribute(Attribute::AttrKind Kind) const
Return the attribute for the given attribute kind.
Definition: Function.h:330
static iterator end()
Definition: Registry.h:99
This class implements an extremely fast bulk output stream that can only output to a stream...
Definition: raw_ostream.h:45
Primary interface to the complete machine description for the target machine.
Definition: TargetMachine.h:58
uint64_t getTypeAllocSizeInBits(Type *Ty) const
Returns the offset in bits between successive objects of the specified type, including alignment padd...
Definition: DataLayout.h:448
MCSymbol * CurrentFnSymForSize
The symbol used to represent the start of the current function for the purpose of calculating its siz...
Definition: AsmPrinter.h:117
void getNameWithPrefix(raw_ostream &OS, const GlobalValue *GV, bool CannotUsePrivateLabel) const
Print the appropriate prefix and the specified global variable&#39;s name.
Definition: Mangler.cpp:111
const DataLayout & getDataLayout() const
Return information about data layout.
Definition: AsmPrinter.cpp:210
Type * getElementType() const
Definition: DerivedTypes.h:391
GCMetadataPrinter - Emits GC metadata as assembly code.
bool isThreadLocal() const
If the value is "Thread Local", its value isn&#39;t shared by the threads.
Definition: GlobalValue.h:246
virtual MCSection * getSectionForJumpTable(const Function &F, const TargetMachine &TM) const
iterator_range< global_iterator > globals()
Definition: Module.h:586
IRTranslator LLVM IR MI
MachineOptimizationRemarkEmitter * ORE
Optimization remark emitter.
Definition: AsmPrinter.h:108
bool hasOneUse() const
Return true if there is exactly one user of this value.
Definition: Value.h:412
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:48
A single uniqued string.
Definition: Metadata.h:603
EK_GPRel32BlockAddress - Each entry is an address of block, encoded with a relocation as gp-relative...
APInt bitcastToAPInt() const
Definition: APFloat.h:1093
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:2443
No exception support.
bool TimePassesIsEnabled
If the user specifies the -time-passes argument on an LLVM tool command line then the value of this b...
Definition: Pass.h:356
bool isBigEndian() const
Definition: DataLayout.h:221
const MCSection * getCurrentSection() const
Return the current section we are emitting to.
Definition: AsmPrinter.cpp:236
unsigned getOpcode() const
Definition: MCInst.h:171
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.
VersionTuple getSDKVersion() const
Get the build SDK version metadata.
Definition: Module.cpp:569
unsigned getNumOperands() const
Return number of MDNode operands.
Definition: Metadata.h:1074
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:413
const ConstantInt * getCImm() const
bool isDoubleTy() const
Return true if this is &#39;double&#39;, a 64-bit IEEE fp type.
Definition: Type.h:149
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:555
DomTreeBase< MachineBasicBlock > & getBase()
static SectionKind getReadOnly()
Definition: SectionKind.h:181
MCSymbol * createTempSymbol(const Twine &Name) const
MCSymbolAttr getProtectedVisibilityAttr() const
Definition: MCAsmInfo.h:559
StructType * getType() const
Specialization - reduce amount of casting.
Definition: Constants.h:486
uint64_t getStackSize() const
Return the number of bytes that must be allocated to hold all of the fixed size frame objects...
const uint64_t Version
Definition: InstrProf.h:894
void emitStackSizeSection(const MachineFunction &MF)
Definition: AsmPrinter.cpp:962
bool use_empty() const
Definition: Value.h:322
#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:163
Type * getElementType() const
Definition: DerivedTypes.h:517
PointerType * getType() const
Global values are always pointers.
Definition: GlobalValue.h:273
.end_data_region
Definition: MCDirectives.h:61
bool supportIndirectSymViaGOTPCRel() const
Target supports replacing a data "PC"-relative access to a symbol through another symbol...
User * user_back()
Definition: Value.h:385
void emitInt16(int Value) const
Emit a short directive and value.
This class contains meta information specific to a module.
This file describes how to lower LLVM code to machine code.
Type * getTypeAtIndex(const Value *V) const
Given an index value into the type, return the type of the element.
Definition: Type.cpp:529
union llvm::MachineConstantPoolEntry::@164 Val
The constant itself.
bool isString(unsigned CharSize=8) const
This method returns true if this is an array of CharSize integers.
Definition: Constants.cpp:2768
MCSubtargetInfo & getSubtargetCopy(const MCSubtargetInfo &STI)
Definition: MCContext.cpp:533