1 //===--- Mangle.cpp - Mangle C++ Names --------------------------*- C++ -*-===//
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 // Implements generic name mangling support for blocks and Objective-C.
10 //
11 //===----------------------------------------------------------------------===//
12 #include "clang/AST/Attr.h"
13 #include "clang/AST/ASTContext.h"
14 #include "clang/AST/Decl.h"
15 #include "clang/AST/DeclCXX.h"
16 #include "clang/AST/DeclObjC.h"
17 #include "clang/AST/DeclTemplate.h"
18 #include "clang/AST/ExprCXX.h"
19 #include "clang/AST/Mangle.h"
20 #include "clang/AST/VTableBuilder.h"
21 #include "clang/Basic/ABI.h"
22 #include "clang/Basic/SourceManager.h"
23 #include "clang/Basic/TargetInfo.h"
24 #include "llvm/ADT/StringExtras.h"
25 #include "llvm/IR/DataLayout.h"
26 #include "llvm/IR/Mangler.h"
27 #include "llvm/Support/ErrorHandling.h"
28 #include "llvm/Support/Format.h"
29 #include "llvm/Support/raw_ostream.h"
30 
31 using namespace clang;
32 
33 // FIXME: For blocks we currently mimic GCC's mangling scheme, which leaves
34 // much to be desired. Come up with a better mangling scheme.
35 
36 static void mangleFunctionBlock(MangleContext &Context,
37                                 StringRef Outer,
38                                 const BlockDecl *BD,
39                                 raw_ostream &Out) {
40   unsigned discriminator = Context.getBlockId(BD, true);
41   if (discriminator == 0)
42     Out << "__" << Outer << "_block_invoke";
43   else
44     Out << "__" << Outer << "_block_invoke_" << discriminator+1;
45 }
46 
47 void MangleContext::anchor() { }
48 
49 enum CCMangling {
50   CCM_Other,
51   CCM_Fast,
52   CCM_RegCall,
53   CCM_Vector,
54   CCM_Std,
55   CCM_WasmMainArgcArgv
56 };
57 
58 static bool isExternC(const NamedDecl *ND) {
59   if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(ND))
60     return FD->isExternC();
61   if (const VarDecl *VD = dyn_cast<VarDecl>(ND))
62     return VD->isExternC();
63   return false;
64 }
65 
66 static CCMangling getCallingConvMangling(const ASTContext &Context,
67                                          const NamedDecl *ND) {
68   const TargetInfo &TI = Context.getTargetInfo();
69   const llvm::Triple &Triple = TI.getTriple();
70 
71   // On wasm, the argc/argv form of "main" is renamed so that the startup code
72   // can call it with the correct function signature.
73   // On Emscripten, users may be exporting "main" and expecting to call it
74   // themselves, so we can't mangle it.
75   if (Triple.isWasm() && !Triple.isOSEmscripten())
76     if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(ND))
77       if (FD->isMain() && FD->hasPrototype() && FD->param_size() == 2)
78         return CCM_WasmMainArgcArgv;
79 
80   if (!Triple.isOSWindows() || !Triple.isX86())
81     return CCM_Other;
82 
83   if (Context.getLangOpts().CPlusPlus && !isExternC(ND) &&
84       TI.getCXXABI() == TargetCXXABI::Microsoft)
85     return CCM_Other;
86 
87   const FunctionDecl *FD = dyn_cast<FunctionDecl>(ND);
88   if (!FD)
89     return CCM_Other;
90   QualType T = FD->getType();
91 
92   const FunctionType *FT = T->castAs<FunctionType>();
93 
94   CallingConv CC = FT->getCallConv();
95   switch (CC) {
96   default:
97     return CCM_Other;
98   case CC_X86FastCall:
99     return CCM_Fast;
100   case CC_X86StdCall:
101     return CCM_Std;
102   case CC_X86VectorCall:
103     return CCM_Vector;
104   }
105 }
106 
107 bool MangleContext::shouldMangleDeclName(const NamedDecl *D) {
108   const ASTContext &ASTContext = getASTContext();
109 
110   CCMangling CC = getCallingConvMangling(ASTContext, D);
111   if (CC != CCM_Other)
112     return true;
113 
114   // If the declaration has an owning module for linkage purposes that needs to
115   // be mangled, we must mangle its name.
116   if (!D->hasExternalFormalLinkage() && D->getOwningModuleForLinkage())
117     return true;
118 
119   // C functions with internal linkage have to be mangled with option
120   // -funique-internal-linkage-names.
121   if (!getASTContext().getLangOpts().CPlusPlus &&
122       isUniqueInternalLinkageDecl(D))
123     return true;
124 
125   // In C, functions with no attributes never need to be mangled. Fastpath them.
126   if (!getASTContext().getLangOpts().CPlusPlus && !D->hasAttrs())
127     return false;
128 
129   // Any decl can be declared with __asm("foo") on it, and this takes precedence
130   // over all other naming in the .o file.
131   if (D->hasAttr<AsmLabelAttr>())
132     return true;
133 
134   // Declarations that don't have identifier names always need to be mangled.
135   if (isa<MSGuidDecl>(D))
136     return true;
137 
138   return shouldMangleCXXName(D);
139 }
140 
141 void MangleContext::mangleName(GlobalDecl GD, raw_ostream &Out) {
142   const ASTContext &ASTContext = getASTContext();
143   const NamedDecl *D = cast<NamedDecl>(GD.getDecl());
144 
145   // Any decl can be declared with __asm("foo") on it, and this takes precedence
146   // over all other naming in the .o file.
147   if (const AsmLabelAttr *ALA = D->getAttr<AsmLabelAttr>()) {
148     // If we have an asm name, then we use it as the mangling.
149 
150     // If the label isn't literal, or if this is an alias for an LLVM intrinsic,
151     // do not add a "\01" prefix.
152     if (!ALA->getIsLiteralLabel() || ALA->getLabel().startswith("llvm.")) {
153       Out << ALA->getLabel();
154       return;
155     }
156 
157     // Adding the prefix can cause problems when one file has a "foo" and
158     // another has a "\01foo". That is known to happen on ELF with the
159     // tricks normally used for producing aliases (PR9177). Fortunately the
160     // llvm mangler on ELF is a nop, so we can just avoid adding the \01
161     // marker.
162     StringRef UserLabelPrefix =
163         getASTContext().getTargetInfo().getUserLabelPrefix();
164 #ifndef NDEBUG
165     char GlobalPrefix =
166         llvm::DataLayout(getASTContext().getTargetInfo().getDataLayoutString())
167             .getGlobalPrefix();
168     assert((UserLabelPrefix.empty() && !GlobalPrefix) ||
169            (UserLabelPrefix.size() == 1 && UserLabelPrefix[0] == GlobalPrefix));
170 #endif
171     if (!UserLabelPrefix.empty())
172       Out << '\01'; // LLVM IR Marker for __asm("foo")
173 
174     Out << ALA->getLabel();
175     return;
176   }
177 
178   if (auto *GD = dyn_cast<MSGuidDecl>(D))
179     return mangleMSGuidDecl(GD, Out);
180 
181   CCMangling CC = getCallingConvMangling(ASTContext, D);
182 
183   if (CC == CCM_WasmMainArgcArgv) {
184     Out << "__main_argc_argv";
185     return;
186   }
187 
188   bool MCXX = shouldMangleCXXName(D);
189   const TargetInfo &TI = Context.getTargetInfo();
190   if (CC == CCM_Other || (MCXX && TI.getCXXABI() == TargetCXXABI::Microsoft)) {
191     if (const ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(D))
192       mangleObjCMethodNameAsSourceName(OMD, Out);
193     else
194       mangleCXXName(GD, Out);
195     return;
196   }
197 
198   Out << '\01';
199   if (CC == CCM_Std)
200     Out << '_';
201   else if (CC == CCM_Fast)
202     Out << '@';
203   else if (CC == CCM_RegCall)
204     Out << "__regcall3__";
205 
206   if (!MCXX)
207     Out << D->getIdentifier()->getName();
208   else if (const ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(D))
209     mangleObjCMethodNameAsSourceName(OMD, Out);
210   else
211     mangleCXXName(GD, Out);
212 
213   const FunctionDecl *FD = cast<FunctionDecl>(D);
214   const FunctionType *FT = FD->getType()->castAs<FunctionType>();
215   const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FT);
216   if (CC == CCM_Vector)
217     Out << '@';
218   Out << '@';
219   if (!Proto) {
220     Out << '0';
221     return;
222   }
223   assert(!Proto->isVariadic());
224   unsigned ArgWords = 0;
225   if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD))
226     if (!MD->isStatic())
227       ++ArgWords;
228   for (const auto &AT : Proto->param_types())
229     // Size should be aligned to pointer size.
230     ArgWords +=
231         llvm::alignTo(ASTContext.getTypeSize(AT), TI.getPointerWidth(0)) /
232         TI.getPointerWidth(0);
233   Out << ((TI.getPointerWidth(0) / 8) * ArgWords);
234 }
235 
236 void MangleContext::mangleMSGuidDecl(const MSGuidDecl *GD, raw_ostream &Out) {
237   // For now, follow the MSVC naming convention for GUID objects on all
238   // targets.
239   MSGuidDecl::Parts P = GD->getParts();
240   Out << llvm::format("_GUID_%08" PRIx32 "_%04" PRIx32 "_%04" PRIx32 "_",
241                       P.Part1, P.Part2, P.Part3);
242   unsigned I = 0;
243   for (uint8_t C : P.Part4And5) {
244     Out << llvm::format("%02" PRIx8, C);
245     if (++I == 2)
246       Out << "_";
247   }
248 }
249 
250 void MangleContext::mangleGlobalBlock(const BlockDecl *BD,
251                                       const NamedDecl *ID,
252                                       raw_ostream &Out) {
253   unsigned discriminator = getBlockId(BD, false);
254   if (ID) {
255     if (shouldMangleDeclName(ID))
256       mangleName(ID, Out);
257     else {
258       Out << ID->getIdentifier()->getName();
259     }
260   }
261   if (discriminator == 0)
262     Out << "_block_invoke";
263   else
264     Out << "_block_invoke_" << discriminator+1;
265 }
266 
267 void MangleContext::mangleCtorBlock(const CXXConstructorDecl *CD,
268                                     CXXCtorType CT, const BlockDecl *BD,
269                                     raw_ostream &ResStream) {
270   SmallString<64> Buffer;
271   llvm::raw_svector_ostream Out(Buffer);
272   mangleName(GlobalDecl(CD, CT), Out);
273   mangleFunctionBlock(*this, Buffer, BD, ResStream);
274 }
275 
276 void MangleContext::mangleDtorBlock(const CXXDestructorDecl *DD,
277                                     CXXDtorType DT, const BlockDecl *BD,
278                                     raw_ostream &ResStream) {
279   SmallString<64> Buffer;
280   llvm::raw_svector_ostream Out(Buffer);
281   mangleName(GlobalDecl(DD, DT), Out);
282   mangleFunctionBlock(*this, Buffer, BD, ResStream);
283 }
284 
285 void MangleContext::mangleBlock(const DeclContext *DC, const BlockDecl *BD,
286                                 raw_ostream &Out) {
287   assert(!isa<CXXConstructorDecl>(DC) && !isa<CXXDestructorDecl>(DC));
288 
289   SmallString<64> Buffer;
290   llvm::raw_svector_ostream Stream(Buffer);
291   if (const ObjCMethodDecl *Method = dyn_cast<ObjCMethodDecl>(DC)) {
292     mangleObjCMethodNameAsSourceName(Method, Stream);
293   } else {
294     assert((isa<NamedDecl>(DC) || isa<BlockDecl>(DC)) &&
295            "expected a NamedDecl or BlockDecl");
296     if (isa<BlockDecl>(DC))
297       for (; DC && isa<BlockDecl>(DC); DC = DC->getParent())
298         (void) getBlockId(cast<BlockDecl>(DC), true);
299     assert((isa<TranslationUnitDecl>(DC) || isa<NamedDecl>(DC)) &&
300            "expected a TranslationUnitDecl or a NamedDecl");
301     if (const auto *CD = dyn_cast<CXXConstructorDecl>(DC))
302       mangleCtorBlock(CD, /*CT*/ Ctor_Complete, BD, Out);
303     else if (const auto *DD = dyn_cast<CXXDestructorDecl>(DC))
304       mangleDtorBlock(DD, /*DT*/ Dtor_Complete, BD, Out);
305     else if (auto ND = dyn_cast<NamedDecl>(DC)) {
306       if (!shouldMangleDeclName(ND) && ND->getIdentifier())
307         Stream << ND->getIdentifier()->getName();
308       else {
309         // FIXME: We were doing a mangleUnqualifiedName() before, but that's
310         // a private member of a class that will soon itself be private to the
311         // Itanium C++ ABI object. What should we do now? Right now, I'm just
312         // calling the mangleName() method on the MangleContext; is there a
313         // better way?
314         mangleName(ND, Stream);
315       }
316     }
317   }
318   mangleFunctionBlock(*this, Buffer, BD, Out);
319 }
320 
321 void MangleContext::mangleObjCMethodName(const ObjCMethodDecl *MD,
322                                          raw_ostream &OS,
323                                          bool includePrefixByte,
324                                          bool includeCategoryNamespace) {
325   if (getASTContext().getLangOpts().ObjCRuntime.isGNUFamily()) {
326     // This is the mangling we've always used on the GNU runtimes, but it
327     // has obvious collisions in the face of underscores within class
328     // names, category names, and selectors; maybe we should improve it.
329 
330     OS << (MD->isClassMethod() ? "_c_" : "_i_")
331        << MD->getClassInterface()->getName() << '_';
332 
333     if (includeCategoryNamespace) {
334       if (auto category = MD->getCategory())
335         OS << category->getName();
336     }
337     OS << '_';
338 
339     auto selector = MD->getSelector();
340     for (unsigned slotIndex = 0,
341                   numArgs = selector.getNumArgs(),
342                   slotEnd = std::max(numArgs, 1U);
343            slotIndex != slotEnd; ++slotIndex) {
344       if (auto name = selector.getIdentifierInfoForSlot(slotIndex))
345         OS << name->getName();
346 
347       // Replace all the positions that would've been ':' with '_'.
348       // That's after each slot except that a unary selector doesn't
349       // end in ':'.
350       if (numArgs)
351         OS << '_';
352     }
353 
354     return;
355   }
356 
357   // \01+[ContainerName(CategoryName) SelectorName]
358   if (includePrefixByte) {
359     OS << '\01';
360   }
361   OS << (MD->isInstanceMethod() ? '-' : '+') << '[';
362   if (const auto *CID = MD->getCategory()) {
363     OS << CID->getClassInterface()->getName();
364     if (includeCategoryNamespace) {
365       OS << '(' << *CID << ')';
366     }
367   } else if (const auto *CD =
368                  dyn_cast<ObjCContainerDecl>(MD->getDeclContext())) {
369     OS << CD->getName();
370   } else {
371     llvm_unreachable("Unexpected ObjC method decl context");
372   }
373   OS << ' ';
374   MD->getSelector().print(OS);
375   OS << ']';
376 }
377 
378 void MangleContext::mangleObjCMethodNameAsSourceName(const ObjCMethodDecl *MD,
379                                                      raw_ostream &Out) {
380   SmallString<64> Name;
381   llvm::raw_svector_ostream OS(Name);
382 
383   mangleObjCMethodName(MD, OS, /*includePrefixByte=*/false,
384                        /*includeCategoryNamespace=*/true);
385   Out << OS.str().size() << OS.str();
386 }
387 
388 class ASTNameGenerator::Implementation {
389   std::unique_ptr<MangleContext> MC;
390   llvm::DataLayout DL;
391 
392 public:
393   explicit Implementation(ASTContext &Ctx)
394       : MC(Ctx.createMangleContext()),
395         DL(Ctx.getTargetInfo().getDataLayoutString()) {}
396 
397   bool writeName(const Decl *D, raw_ostream &OS) {
398     // First apply frontend mangling.
399     SmallString<128> FrontendBuf;
400     llvm::raw_svector_ostream FrontendBufOS(FrontendBuf);
401     if (auto *FD = dyn_cast<FunctionDecl>(D)) {
402       if (FD->isDependentContext())
403         return true;
404       if (writeFuncOrVarName(FD, FrontendBufOS))
405         return true;
406     } else if (auto *VD = dyn_cast<VarDecl>(D)) {
407       if (writeFuncOrVarName(VD, FrontendBufOS))
408         return true;
409     } else if (auto *MD = dyn_cast<ObjCMethodDecl>(D)) {
410       MC->mangleObjCMethodName(MD, OS, /*includePrefixByte=*/false,
411                                /*includeCategoryNamespace=*/true);
412       return false;
413     } else if (auto *ID = dyn_cast<ObjCInterfaceDecl>(D)) {
414       writeObjCClassName(ID, FrontendBufOS);
415     } else {
416       return true;
417     }
418 
419     // Now apply backend mangling.
420     llvm::Mangler::getNameWithPrefix(OS, FrontendBufOS.str(), DL);
421     return false;
422   }
423 
424   std::string getName(const Decl *D) {
425     std::string Name;
426     {
427       llvm::raw_string_ostream OS(Name);
428       writeName(D, OS);
429     }
430     return Name;
431   }
432 
433   enum ObjCKind {
434     ObjCClass,
435     ObjCMetaclass,
436   };
437 
438   static StringRef getClassSymbolPrefix(ObjCKind Kind,
439                                         const ASTContext &Context) {
440     if (Context.getLangOpts().ObjCRuntime.isGNUFamily())
441       return Kind == ObjCMetaclass ? "_OBJC_METACLASS_" : "_OBJC_CLASS_";
442     return Kind == ObjCMetaclass ? "OBJC_METACLASS_$_" : "OBJC_CLASS_$_";
443   }
444 
445   std::vector<std::string> getAllManglings(const ObjCContainerDecl *OCD) {
446     StringRef ClassName;
447     if (const auto *OID = dyn_cast<ObjCInterfaceDecl>(OCD))
448       ClassName = OID->getObjCRuntimeNameAsString();
449     else if (const auto *OID = dyn_cast<ObjCImplementationDecl>(OCD))
450       ClassName = OID->getObjCRuntimeNameAsString();
451 
452     if (ClassName.empty())
453       return {};
454 
455     auto Mangle = [&](ObjCKind Kind, StringRef ClassName) -> std::string {
456       SmallString<40> Mangled;
457       auto Prefix = getClassSymbolPrefix(Kind, OCD->getASTContext());
458       llvm::Mangler::getNameWithPrefix(Mangled, Prefix + ClassName, DL);
459       return std::string(Mangled.str());
460     };
461 
462     return {
463         Mangle(ObjCClass, ClassName),
464         Mangle(ObjCMetaclass, ClassName),
465     };
466   }
467 
468   std::vector<std::string> getAllManglings(const Decl *D) {
469     if (const auto *OCD = dyn_cast<ObjCContainerDecl>(D))
470       return getAllManglings(OCD);
471 
472     if (!(isa<CXXRecordDecl>(D) || isa<CXXMethodDecl>(D)))
473       return {};
474 
475     const NamedDecl *ND = cast<NamedDecl>(D);
476 
477     ASTContext &Ctx = ND->getASTContext();
478     std::unique_ptr<MangleContext> M(Ctx.createMangleContext());
479 
480     std::vector<std::string> Manglings;
481 
482     auto hasDefaultCXXMethodCC = [](ASTContext &C, const CXXMethodDecl *MD) {
483       auto DefaultCC = C.getDefaultCallingConvention(/*IsVariadic=*/false,
484                                                      /*IsCXXMethod=*/true);
485       auto CC = MD->getType()->castAs<FunctionProtoType>()->getCallConv();
486       return CC == DefaultCC;
487     };
488 
489     if (const auto *CD = dyn_cast_or_null<CXXConstructorDecl>(ND)) {
490       Manglings.emplace_back(getMangledStructor(CD, Ctor_Base));
491 
492       if (Ctx.getTargetInfo().getCXXABI().isItaniumFamily())
493         if (!CD->getParent()->isAbstract())
494           Manglings.emplace_back(getMangledStructor(CD, Ctor_Complete));
495 
496       if (Ctx.getTargetInfo().getCXXABI().isMicrosoft())
497         if (CD->hasAttr<DLLExportAttr>() && CD->isDefaultConstructor())
498           if (!(hasDefaultCXXMethodCC(Ctx, CD) && CD->getNumParams() == 0))
499             Manglings.emplace_back(getMangledStructor(CD, Ctor_DefaultClosure));
500     } else if (const auto *DD = dyn_cast_or_null<CXXDestructorDecl>(ND)) {
501       Manglings.emplace_back(getMangledStructor(DD, Dtor_Base));
502       if (Ctx.getTargetInfo().getCXXABI().isItaniumFamily()) {
503         Manglings.emplace_back(getMangledStructor(DD, Dtor_Complete));
504         if (DD->isVirtual())
505           Manglings.emplace_back(getMangledStructor(DD, Dtor_Deleting));
506       }
507     } else if (const auto *MD = dyn_cast_or_null<CXXMethodDecl>(ND)) {
508       Manglings.emplace_back(getName(ND));
509       if (MD->isVirtual())
510         if (const auto *TIV = Ctx.getVTableContext()->getThunkInfo(MD))
511           for (const auto &T : *TIV)
512             Manglings.emplace_back(getMangledThunk(MD, T));
513     }
514 
515     return Manglings;
516   }
517 
518 private:
519   bool writeFuncOrVarName(const NamedDecl *D, raw_ostream &OS) {
520     if (MC->shouldMangleDeclName(D)) {
521       GlobalDecl GD;
522       if (const auto *CtorD = dyn_cast<CXXConstructorDecl>(D))
523         GD = GlobalDecl(CtorD, Ctor_Complete);
524       else if (const auto *DtorD = dyn_cast<CXXDestructorDecl>(D))
525         GD = GlobalDecl(DtorD, Dtor_Complete);
526       else if (D->hasAttr<CUDAGlobalAttr>())
527         GD = GlobalDecl(cast<FunctionDecl>(D));
528       else
529         GD = GlobalDecl(D);
530       MC->mangleName(GD, OS);
531       return false;
532     } else {
533       IdentifierInfo *II = D->getIdentifier();
534       if (!II)
535         return true;
536       OS << II->getName();
537       return false;
538     }
539   }
540 
541   void writeObjCClassName(const ObjCInterfaceDecl *D, raw_ostream &OS) {
542     OS << getClassSymbolPrefix(ObjCClass, D->getASTContext());
543     OS << D->getObjCRuntimeNameAsString();
544   }
545 
546   std::string getMangledStructor(const NamedDecl *ND, unsigned StructorType) {
547     std::string FrontendBuf;
548     llvm::raw_string_ostream FOS(FrontendBuf);
549 
550     GlobalDecl GD;
551     if (const auto *CD = dyn_cast_or_null<CXXConstructorDecl>(ND))
552       GD = GlobalDecl(CD, static_cast<CXXCtorType>(StructorType));
553     else if (const auto *DD = dyn_cast_or_null<CXXDestructorDecl>(ND))
554       GD = GlobalDecl(DD, static_cast<CXXDtorType>(StructorType));
555     MC->mangleName(GD, FOS);
556 
557     std::string BackendBuf;
558     llvm::raw_string_ostream BOS(BackendBuf);
559 
560     llvm::Mangler::getNameWithPrefix(BOS, FOS.str(), DL);
561 
562     return BOS.str();
563   }
564 
565   std::string getMangledThunk(const CXXMethodDecl *MD, const ThunkInfo &T) {
566     std::string FrontendBuf;
567     llvm::raw_string_ostream FOS(FrontendBuf);
568 
569     MC->mangleThunk(MD, T, FOS);
570 
571     std::string BackendBuf;
572     llvm::raw_string_ostream BOS(BackendBuf);
573 
574     llvm::Mangler::getNameWithPrefix(BOS, FOS.str(), DL);
575 
576     return BOS.str();
577   }
578 };
579 
580 ASTNameGenerator::ASTNameGenerator(ASTContext &Ctx)
581     : Impl(std::make_unique<Implementation>(Ctx)) {}
582 
583 ASTNameGenerator::~ASTNameGenerator() {}
584 
585 bool ASTNameGenerator::writeName(const Decl *D, raw_ostream &OS) {
586   return Impl->writeName(D, OS);
587 }
588 
589 std::string ASTNameGenerator::getName(const Decl *D) {
590   return Impl->getName(D);
591 }
592 
593 std::vector<std::string> ASTNameGenerator::getAllManglings(const Decl *D) {
594   return Impl->getAllManglings(D);
595 }
596