1 //===--- ItaniumMangle.cpp - Itanium C++ Name Mangling ----------*- 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 C++ name mangling according to the Itanium C++ ABI,
10 // which is used in GCC 3.2 and newer (and many compilers that are
11 // ABI-compatible with GCC):
12 //
13 // http://itanium-cxx-abi.github.io/cxx-abi/abi.html#mangling
14 //
15 //===----------------------------------------------------------------------===//
16
17 #include "clang/AST/Mangle.h"
18 #include "clang/AST/ASTContext.h"
19 #include "clang/AST/Attr.h"
20 #include "clang/AST/Decl.h"
21 #include "clang/AST/DeclCXX.h"
22 #include "clang/AST/DeclObjC.h"
23 #include "clang/AST/DeclOpenMP.h"
24 #include "clang/AST/DeclTemplate.h"
25 #include "clang/AST/Expr.h"
26 #include "clang/AST/ExprConcepts.h"
27 #include "clang/AST/ExprCXX.h"
28 #include "clang/AST/ExprObjC.h"
29 #include "clang/AST/TypeLoc.h"
30 #include "clang/Basic/ABI.h"
31 #include "clang/Basic/Module.h"
32 #include "clang/Basic/SourceManager.h"
33 #include "clang/Basic/TargetInfo.h"
34 #include "llvm/ADT/StringExtras.h"
35 #include "llvm/Support/ErrorHandling.h"
36 #include "llvm/Support/raw_ostream.h"
37
38 using namespace clang;
39
40 namespace {
41
42 /// Retrieve the declaration context that should be used when mangling the given
43 /// declaration.
getEffectiveDeclContext(const Decl * D)44 static const DeclContext *getEffectiveDeclContext(const Decl *D) {
45 // The ABI assumes that lambda closure types that occur within
46 // default arguments live in the context of the function. However, due to
47 // the way in which Clang parses and creates function declarations, this is
48 // not the case: the lambda closure type ends up living in the context
49 // where the function itself resides, because the function declaration itself
50 // had not yet been created. Fix the context here.
51 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(D)) {
52 if (RD->isLambda())
53 if (ParmVarDecl *ContextParam
54 = dyn_cast_or_null<ParmVarDecl>(RD->getLambdaContextDecl()))
55 return ContextParam->getDeclContext();
56 }
57
58 // Perform the same check for block literals.
59 if (const BlockDecl *BD = dyn_cast<BlockDecl>(D)) {
60 if (ParmVarDecl *ContextParam
61 = dyn_cast_or_null<ParmVarDecl>(BD->getBlockManglingContextDecl()))
62 return ContextParam->getDeclContext();
63 }
64
65 const DeclContext *DC = D->getDeclContext();
66 if (isa<CapturedDecl>(DC) || isa<OMPDeclareReductionDecl>(DC) ||
67 isa<OMPDeclareMapperDecl>(DC)) {
68 return getEffectiveDeclContext(cast<Decl>(DC));
69 }
70
71 if (const auto *VD = dyn_cast<VarDecl>(D))
72 if (VD->isExternC())
73 return VD->getASTContext().getTranslationUnitDecl();
74
75 if (const auto *FD = dyn_cast<FunctionDecl>(D))
76 if (FD->isExternC())
77 return FD->getASTContext().getTranslationUnitDecl();
78
79 return DC->getRedeclContext();
80 }
81
getEffectiveParentContext(const DeclContext * DC)82 static const DeclContext *getEffectiveParentContext(const DeclContext *DC) {
83 return getEffectiveDeclContext(cast<Decl>(DC));
84 }
85
isLocalContainerContext(const DeclContext * DC)86 static bool isLocalContainerContext(const DeclContext *DC) {
87 return isa<FunctionDecl>(DC) || isa<ObjCMethodDecl>(DC) || isa<BlockDecl>(DC);
88 }
89
GetLocalClassDecl(const Decl * D)90 static const RecordDecl *GetLocalClassDecl(const Decl *D) {
91 const DeclContext *DC = getEffectiveDeclContext(D);
92 while (!DC->isNamespace() && !DC->isTranslationUnit()) {
93 if (isLocalContainerContext(DC))
94 return dyn_cast<RecordDecl>(D);
95 D = cast<Decl>(DC);
96 DC = getEffectiveDeclContext(D);
97 }
98 return nullptr;
99 }
100
getStructor(const FunctionDecl * fn)101 static const FunctionDecl *getStructor(const FunctionDecl *fn) {
102 if (const FunctionTemplateDecl *ftd = fn->getPrimaryTemplate())
103 return ftd->getTemplatedDecl();
104
105 return fn;
106 }
107
getStructor(const NamedDecl * decl)108 static const NamedDecl *getStructor(const NamedDecl *decl) {
109 const FunctionDecl *fn = dyn_cast_or_null<FunctionDecl>(decl);
110 return (fn ? getStructor(fn) : decl);
111 }
112
isLambda(const NamedDecl * ND)113 static bool isLambda(const NamedDecl *ND) {
114 const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(ND);
115 if (!Record)
116 return false;
117
118 return Record->isLambda();
119 }
120
121 static const unsigned UnknownArity = ~0U;
122
123 class ItaniumMangleContextImpl : public ItaniumMangleContext {
124 typedef std::pair<const DeclContext*, IdentifierInfo*> DiscriminatorKeyTy;
125 llvm::DenseMap<DiscriminatorKeyTy, unsigned> Discriminator;
126 llvm::DenseMap<const NamedDecl*, unsigned> Uniquifier;
127
128 bool IsDevCtx = false;
129
130 public:
ItaniumMangleContextImpl(ASTContext & Context,DiagnosticsEngine & Diags)131 explicit ItaniumMangleContextImpl(ASTContext &Context,
132 DiagnosticsEngine &Diags)
133 : ItaniumMangleContext(Context, Diags) {}
134
135 /// @name Mangler Entry Points
136 /// @{
137
138 bool shouldMangleCXXName(const NamedDecl *D) override;
shouldMangleStringLiteral(const StringLiteral *)139 bool shouldMangleStringLiteral(const StringLiteral *) override {
140 return false;
141 }
142
isDeviceMangleContext() const143 bool isDeviceMangleContext() const override { return IsDevCtx; }
setDeviceMangleContext(bool IsDev)144 void setDeviceMangleContext(bool IsDev) override { IsDevCtx = IsDev; }
145
146 void mangleCXXName(GlobalDecl GD, raw_ostream &) override;
147 void mangleThunk(const CXXMethodDecl *MD, const ThunkInfo &Thunk,
148 raw_ostream &) override;
149 void mangleCXXDtorThunk(const CXXDestructorDecl *DD, CXXDtorType Type,
150 const ThisAdjustment &ThisAdjustment,
151 raw_ostream &) override;
152 void mangleReferenceTemporary(const VarDecl *D, unsigned ManglingNumber,
153 raw_ostream &) override;
154 void mangleCXXVTable(const CXXRecordDecl *RD, raw_ostream &) override;
155 void mangleCXXVTT(const CXXRecordDecl *RD, raw_ostream &) override;
156 void mangleCXXCtorVTable(const CXXRecordDecl *RD, int64_t Offset,
157 const CXXRecordDecl *Type, raw_ostream &) override;
158 void mangleCXXRTTI(QualType T, raw_ostream &) override;
159 void mangleCXXRTTIName(QualType T, raw_ostream &) override;
160 void mangleTypeName(QualType T, raw_ostream &) override;
161
162 void mangleCXXCtorComdat(const CXXConstructorDecl *D, raw_ostream &) override;
163 void mangleCXXDtorComdat(const CXXDestructorDecl *D, raw_ostream &) override;
164 void mangleStaticGuardVariable(const VarDecl *D, raw_ostream &) override;
165 void mangleDynamicInitializer(const VarDecl *D, raw_ostream &Out) override;
166 void mangleDynamicAtExitDestructor(const VarDecl *D,
167 raw_ostream &Out) override;
168 void mangleDynamicStermFinalizer(const VarDecl *D, raw_ostream &Out) override;
169 void mangleSEHFilterExpression(const NamedDecl *EnclosingDecl,
170 raw_ostream &Out) override;
171 void mangleSEHFinallyBlock(const NamedDecl *EnclosingDecl,
172 raw_ostream &Out) override;
173 void mangleItaniumThreadLocalInit(const VarDecl *D, raw_ostream &) override;
174 void mangleItaniumThreadLocalWrapper(const VarDecl *D,
175 raw_ostream &) override;
176
177 void mangleStringLiteral(const StringLiteral *, raw_ostream &) override;
178
179 void mangleLambdaSig(const CXXRecordDecl *Lambda, raw_ostream &) override;
180
getNextDiscriminator(const NamedDecl * ND,unsigned & disc)181 bool getNextDiscriminator(const NamedDecl *ND, unsigned &disc) {
182 // Lambda closure types are already numbered.
183 if (isLambda(ND))
184 return false;
185
186 // Anonymous tags are already numbered.
187 if (const TagDecl *Tag = dyn_cast<TagDecl>(ND)) {
188 if (Tag->getName().empty() && !Tag->getTypedefNameForAnonDecl())
189 return false;
190 }
191
192 // Use the canonical number for externally visible decls.
193 if (ND->isExternallyVisible()) {
194 unsigned discriminator = getASTContext().getManglingNumber(ND);
195 if (discriminator == 1)
196 return false;
197 disc = discriminator - 2;
198 return true;
199 }
200
201 // Make up a reasonable number for internal decls.
202 unsigned &discriminator = Uniquifier[ND];
203 if (!discriminator) {
204 const DeclContext *DC = getEffectiveDeclContext(ND);
205 discriminator = ++Discriminator[std::make_pair(DC, ND->getIdentifier())];
206 }
207 if (discriminator == 1)
208 return false;
209 disc = discriminator-2;
210 return true;
211 }
212 /// @}
213 };
214
215 /// Manage the mangling of a single name.
216 class CXXNameMangler {
217 ItaniumMangleContextImpl &Context;
218 raw_ostream &Out;
219 bool NullOut = false;
220 /// In the "DisableDerivedAbiTags" mode derived ABI tags are not calculated.
221 /// This mode is used when mangler creates another mangler recursively to
222 /// calculate ABI tags for the function return value or the variable type.
223 /// Also it is required to avoid infinite recursion in some cases.
224 bool DisableDerivedAbiTags = false;
225
226 /// The "structor" is the top-level declaration being mangled, if
227 /// that's not a template specialization; otherwise it's the pattern
228 /// for that specialization.
229 const NamedDecl *Structor;
230 unsigned StructorType;
231
232 /// The next substitution sequence number.
233 unsigned SeqID;
234
235 class FunctionTypeDepthState {
236 unsigned Bits;
237
238 enum { InResultTypeMask = 1 };
239
240 public:
FunctionTypeDepthState()241 FunctionTypeDepthState() : Bits(0) {}
242
243 /// The number of function types we're inside.
getDepth() const244 unsigned getDepth() const {
245 return Bits >> 1;
246 }
247
248 /// True if we're in the return type of the innermost function type.
isInResultType() const249 bool isInResultType() const {
250 return Bits & InResultTypeMask;
251 }
252
push()253 FunctionTypeDepthState push() {
254 FunctionTypeDepthState tmp = *this;
255 Bits = (Bits & ~InResultTypeMask) + 2;
256 return tmp;
257 }
258
enterResultType()259 void enterResultType() {
260 Bits |= InResultTypeMask;
261 }
262
leaveResultType()263 void leaveResultType() {
264 Bits &= ~InResultTypeMask;
265 }
266
pop(FunctionTypeDepthState saved)267 void pop(FunctionTypeDepthState saved) {
268 assert(getDepth() == saved.getDepth() + 1);
269 Bits = saved.Bits;
270 }
271
272 } FunctionTypeDepth;
273
274 // abi_tag is a gcc attribute, taking one or more strings called "tags".
275 // The goal is to annotate against which version of a library an object was
276 // built and to be able to provide backwards compatibility ("dual abi").
277 // For more information see docs/ItaniumMangleAbiTags.rst.
278 typedef SmallVector<StringRef, 4> AbiTagList;
279
280 // State to gather all implicit and explicit tags used in a mangled name.
281 // Must always have an instance of this while emitting any name to keep
282 // track.
283 class AbiTagState final {
284 public:
AbiTagState(AbiTagState * & Head)285 explicit AbiTagState(AbiTagState *&Head) : LinkHead(Head) {
286 Parent = LinkHead;
287 LinkHead = this;
288 }
289
290 // No copy, no move.
291 AbiTagState(const AbiTagState &) = delete;
292 AbiTagState &operator=(const AbiTagState &) = delete;
293
~AbiTagState()294 ~AbiTagState() { pop(); }
295
write(raw_ostream & Out,const NamedDecl * ND,const AbiTagList * AdditionalAbiTags)296 void write(raw_ostream &Out, const NamedDecl *ND,
297 const AbiTagList *AdditionalAbiTags) {
298 ND = cast<NamedDecl>(ND->getCanonicalDecl());
299 if (!isa<FunctionDecl>(ND) && !isa<VarDecl>(ND)) {
300 assert(
301 !AdditionalAbiTags &&
302 "only function and variables need a list of additional abi tags");
303 if (const auto *NS = dyn_cast<NamespaceDecl>(ND)) {
304 if (const auto *AbiTag = NS->getAttr<AbiTagAttr>()) {
305 UsedAbiTags.insert(UsedAbiTags.end(), AbiTag->tags().begin(),
306 AbiTag->tags().end());
307 }
308 // Don't emit abi tags for namespaces.
309 return;
310 }
311 }
312
313 AbiTagList TagList;
314 if (const auto *AbiTag = ND->getAttr<AbiTagAttr>()) {
315 UsedAbiTags.insert(UsedAbiTags.end(), AbiTag->tags().begin(),
316 AbiTag->tags().end());
317 TagList.insert(TagList.end(), AbiTag->tags().begin(),
318 AbiTag->tags().end());
319 }
320
321 if (AdditionalAbiTags) {
322 UsedAbiTags.insert(UsedAbiTags.end(), AdditionalAbiTags->begin(),
323 AdditionalAbiTags->end());
324 TagList.insert(TagList.end(), AdditionalAbiTags->begin(),
325 AdditionalAbiTags->end());
326 }
327
328 llvm::sort(TagList);
329 TagList.erase(std::unique(TagList.begin(), TagList.end()), TagList.end());
330
331 writeSortedUniqueAbiTags(Out, TagList);
332 }
333
getUsedAbiTags() const334 const AbiTagList &getUsedAbiTags() const { return UsedAbiTags; }
setUsedAbiTags(const AbiTagList & AbiTags)335 void setUsedAbiTags(const AbiTagList &AbiTags) {
336 UsedAbiTags = AbiTags;
337 }
338
getEmittedAbiTags() const339 const AbiTagList &getEmittedAbiTags() const {
340 return EmittedAbiTags;
341 }
342
getSortedUniqueUsedAbiTags()343 const AbiTagList &getSortedUniqueUsedAbiTags() {
344 llvm::sort(UsedAbiTags);
345 UsedAbiTags.erase(std::unique(UsedAbiTags.begin(), UsedAbiTags.end()),
346 UsedAbiTags.end());
347 return UsedAbiTags;
348 }
349
350 private:
351 //! All abi tags used implicitly or explicitly.
352 AbiTagList UsedAbiTags;
353 //! All explicit abi tags (i.e. not from namespace).
354 AbiTagList EmittedAbiTags;
355
356 AbiTagState *&LinkHead;
357 AbiTagState *Parent = nullptr;
358
pop()359 void pop() {
360 assert(LinkHead == this &&
361 "abi tag link head must point to us on destruction");
362 if (Parent) {
363 Parent->UsedAbiTags.insert(Parent->UsedAbiTags.end(),
364 UsedAbiTags.begin(), UsedAbiTags.end());
365 Parent->EmittedAbiTags.insert(Parent->EmittedAbiTags.end(),
366 EmittedAbiTags.begin(),
367 EmittedAbiTags.end());
368 }
369 LinkHead = Parent;
370 }
371
writeSortedUniqueAbiTags(raw_ostream & Out,const AbiTagList & AbiTags)372 void writeSortedUniqueAbiTags(raw_ostream &Out, const AbiTagList &AbiTags) {
373 for (const auto &Tag : AbiTags) {
374 EmittedAbiTags.push_back(Tag);
375 Out << "B";
376 Out << Tag.size();
377 Out << Tag;
378 }
379 }
380 };
381
382 AbiTagState *AbiTags = nullptr;
383 AbiTagState AbiTagsRoot;
384
385 llvm::DenseMap<uintptr_t, unsigned> Substitutions;
386 llvm::DenseMap<StringRef, unsigned> ModuleSubstitutions;
387
getASTContext() const388 ASTContext &getASTContext() const { return Context.getASTContext(); }
389
390 public:
CXXNameMangler(ItaniumMangleContextImpl & C,raw_ostream & Out_,const NamedDecl * D=nullptr,bool NullOut_=false)391 CXXNameMangler(ItaniumMangleContextImpl &C, raw_ostream &Out_,
392 const NamedDecl *D = nullptr, bool NullOut_ = false)
393 : Context(C), Out(Out_), NullOut(NullOut_), Structor(getStructor(D)),
394 StructorType(0), SeqID(0), AbiTagsRoot(AbiTags) {
395 // These can't be mangled without a ctor type or dtor type.
396 assert(!D || (!isa<CXXDestructorDecl>(D) &&
397 !isa<CXXConstructorDecl>(D)));
398 }
CXXNameMangler(ItaniumMangleContextImpl & C,raw_ostream & Out_,const CXXConstructorDecl * D,CXXCtorType Type)399 CXXNameMangler(ItaniumMangleContextImpl &C, raw_ostream &Out_,
400 const CXXConstructorDecl *D, CXXCtorType Type)
401 : Context(C), Out(Out_), Structor(getStructor(D)), StructorType(Type),
402 SeqID(0), AbiTagsRoot(AbiTags) { }
CXXNameMangler(ItaniumMangleContextImpl & C,raw_ostream & Out_,const CXXDestructorDecl * D,CXXDtorType Type)403 CXXNameMangler(ItaniumMangleContextImpl &C, raw_ostream &Out_,
404 const CXXDestructorDecl *D, CXXDtorType Type)
405 : Context(C), Out(Out_), Structor(getStructor(D)), StructorType(Type),
406 SeqID(0), AbiTagsRoot(AbiTags) { }
407
CXXNameMangler(CXXNameMangler & Outer,raw_ostream & Out_)408 CXXNameMangler(CXXNameMangler &Outer, raw_ostream &Out_)
409 : Context(Outer.Context), Out(Out_), NullOut(false),
410 Structor(Outer.Structor), StructorType(Outer.StructorType),
411 SeqID(Outer.SeqID), FunctionTypeDepth(Outer.FunctionTypeDepth),
412 AbiTagsRoot(AbiTags), Substitutions(Outer.Substitutions) {}
413
CXXNameMangler(CXXNameMangler & Outer,llvm::raw_null_ostream & Out_)414 CXXNameMangler(CXXNameMangler &Outer, llvm::raw_null_ostream &Out_)
415 : Context(Outer.Context), Out(Out_), NullOut(true),
416 Structor(Outer.Structor), StructorType(Outer.StructorType),
417 SeqID(Outer.SeqID), FunctionTypeDepth(Outer.FunctionTypeDepth),
418 AbiTagsRoot(AbiTags), Substitutions(Outer.Substitutions) {}
419
getStream()420 raw_ostream &getStream() { return Out; }
421
disableDerivedAbiTags()422 void disableDerivedAbiTags() { DisableDerivedAbiTags = true; }
423 static bool shouldHaveAbiTags(ItaniumMangleContextImpl &C, const VarDecl *VD);
424
425 void mangle(GlobalDecl GD);
426 void mangleCallOffset(int64_t NonVirtual, int64_t Virtual);
427 void mangleNumber(const llvm::APSInt &I);
428 void mangleNumber(int64_t Number);
429 void mangleFloat(const llvm::APFloat &F);
430 void mangleFunctionEncoding(GlobalDecl GD);
431 void mangleSeqID(unsigned SeqID);
432 void mangleName(GlobalDecl GD);
433 void mangleType(QualType T);
434 void mangleNameOrStandardSubstitution(const NamedDecl *ND);
435 void mangleLambdaSig(const CXXRecordDecl *Lambda);
436
437 private:
438
439 bool mangleSubstitution(const NamedDecl *ND);
440 bool mangleSubstitution(QualType T);
441 bool mangleSubstitution(TemplateName Template);
442 bool mangleSubstitution(uintptr_t Ptr);
443
444 void mangleExistingSubstitution(TemplateName name);
445
446 bool mangleStandardSubstitution(const NamedDecl *ND);
447
addSubstitution(const NamedDecl * ND)448 void addSubstitution(const NamedDecl *ND) {
449 ND = cast<NamedDecl>(ND->getCanonicalDecl());
450
451 addSubstitution(reinterpret_cast<uintptr_t>(ND));
452 }
453 void addSubstitution(QualType T);
454 void addSubstitution(TemplateName Template);
455 void addSubstitution(uintptr_t Ptr);
456 // Destructive copy substitutions from other mangler.
457 void extendSubstitutions(CXXNameMangler* Other);
458
459 void mangleUnresolvedPrefix(NestedNameSpecifier *qualifier,
460 bool recursive = false);
461 void mangleUnresolvedName(NestedNameSpecifier *qualifier,
462 DeclarationName name,
463 const TemplateArgumentLoc *TemplateArgs,
464 unsigned NumTemplateArgs,
465 unsigned KnownArity = UnknownArity);
466
467 void mangleFunctionEncodingBareType(const FunctionDecl *FD);
468
469 void mangleNameWithAbiTags(GlobalDecl GD,
470 const AbiTagList *AdditionalAbiTags);
471 void mangleModuleName(const Module *M);
472 void mangleModuleNamePrefix(StringRef Name);
473 void mangleTemplateName(const TemplateDecl *TD,
474 const TemplateArgument *TemplateArgs,
475 unsigned NumTemplateArgs);
mangleUnqualifiedName(GlobalDecl GD,const AbiTagList * AdditionalAbiTags)476 void mangleUnqualifiedName(GlobalDecl GD,
477 const AbiTagList *AdditionalAbiTags) {
478 mangleUnqualifiedName(GD, cast<NamedDecl>(GD.getDecl())->getDeclName(), UnknownArity,
479 AdditionalAbiTags);
480 }
481 void mangleUnqualifiedName(GlobalDecl GD, DeclarationName Name,
482 unsigned KnownArity,
483 const AbiTagList *AdditionalAbiTags);
484 void mangleUnscopedName(GlobalDecl GD,
485 const AbiTagList *AdditionalAbiTags);
486 void mangleUnscopedTemplateName(GlobalDecl GD,
487 const AbiTagList *AdditionalAbiTags);
488 void mangleSourceName(const IdentifierInfo *II);
489 void mangleRegCallName(const IdentifierInfo *II);
490 void mangleDeviceStubName(const IdentifierInfo *II);
491 void mangleSourceNameWithAbiTags(
492 const NamedDecl *ND, const AbiTagList *AdditionalAbiTags = nullptr);
493 void mangleLocalName(GlobalDecl GD,
494 const AbiTagList *AdditionalAbiTags);
495 void mangleBlockForPrefix(const BlockDecl *Block);
496 void mangleUnqualifiedBlock(const BlockDecl *Block);
497 void mangleTemplateParamDecl(const NamedDecl *Decl);
498 void mangleLambda(const CXXRecordDecl *Lambda);
499 void mangleNestedName(GlobalDecl GD, const DeclContext *DC,
500 const AbiTagList *AdditionalAbiTags,
501 bool NoFunction=false);
502 void mangleNestedName(const TemplateDecl *TD,
503 const TemplateArgument *TemplateArgs,
504 unsigned NumTemplateArgs);
505 void manglePrefix(NestedNameSpecifier *qualifier);
506 void manglePrefix(const DeclContext *DC, bool NoFunction=false);
507 void manglePrefix(QualType type);
508 void mangleTemplatePrefix(GlobalDecl GD, bool NoFunction=false);
509 void mangleTemplatePrefix(TemplateName Template);
510 bool mangleUnresolvedTypeOrSimpleId(QualType DestroyedType,
511 StringRef Prefix = "");
512 void mangleOperatorName(DeclarationName Name, unsigned Arity);
513 void mangleOperatorName(OverloadedOperatorKind OO, unsigned Arity);
514 void mangleVendorQualifier(StringRef qualifier);
515 void mangleQualifiers(Qualifiers Quals, const DependentAddressSpaceType *DAST = nullptr);
516 void mangleRefQualifier(RefQualifierKind RefQualifier);
517
518 void mangleObjCMethodName(const ObjCMethodDecl *MD);
519
520 // Declare manglers for every type class.
521 #define ABSTRACT_TYPE(CLASS, PARENT)
522 #define NON_CANONICAL_TYPE(CLASS, PARENT)
523 #define TYPE(CLASS, PARENT) void mangleType(const CLASS##Type *T);
524 #include "clang/AST/TypeNodes.inc"
525
526 void mangleType(const TagType*);
527 void mangleType(TemplateName);
528 static StringRef getCallingConvQualifierName(CallingConv CC);
529 void mangleExtParameterInfo(FunctionProtoType::ExtParameterInfo info);
530 void mangleExtFunctionInfo(const FunctionType *T);
531 void mangleBareFunctionType(const FunctionProtoType *T, bool MangleReturnType,
532 const FunctionDecl *FD = nullptr);
533 void mangleNeonVectorType(const VectorType *T);
534 void mangleNeonVectorType(const DependentVectorType *T);
535 void mangleAArch64NeonVectorType(const VectorType *T);
536 void mangleAArch64NeonVectorType(const DependentVectorType *T);
537 void mangleAArch64FixedSveVectorType(const VectorType *T);
538 void mangleAArch64FixedSveVectorType(const DependentVectorType *T);
539
540 void mangleIntegerLiteral(QualType T, const llvm::APSInt &Value);
541 void mangleFloatLiteral(QualType T, const llvm::APFloat &V);
542 void mangleFixedPointLiteral();
543 void mangleNullPointer(QualType T);
544
545 void mangleMemberExprBase(const Expr *base, bool isArrow);
546 void mangleMemberExpr(const Expr *base, bool isArrow,
547 NestedNameSpecifier *qualifier,
548 NamedDecl *firstQualifierLookup,
549 DeclarationName name,
550 const TemplateArgumentLoc *TemplateArgs,
551 unsigned NumTemplateArgs,
552 unsigned knownArity);
553 void mangleCastExpression(const Expr *E, StringRef CastEncoding);
554 void mangleInitListElements(const InitListExpr *InitList);
555 void mangleExpression(const Expr *E, unsigned Arity = UnknownArity,
556 bool AsTemplateArg = false);
557 void mangleCXXCtorType(CXXCtorType T, const CXXRecordDecl *InheritedFrom);
558 void mangleCXXDtorType(CXXDtorType T);
559
560 void mangleTemplateArgs(TemplateName TN,
561 const TemplateArgumentLoc *TemplateArgs,
562 unsigned NumTemplateArgs);
563 void mangleTemplateArgs(TemplateName TN, const TemplateArgument *TemplateArgs,
564 unsigned NumTemplateArgs);
565 void mangleTemplateArgs(TemplateName TN, const TemplateArgumentList &AL);
566 void mangleTemplateArg(TemplateArgument A, bool NeedExactType);
567 void mangleTemplateArgExpr(const Expr *E);
568 void mangleValueInTemplateArg(QualType T, const APValue &V, bool TopLevel,
569 bool NeedExactType = false);
570
571 void mangleTemplateParameter(unsigned Depth, unsigned Index);
572
573 void mangleFunctionParam(const ParmVarDecl *parm);
574
575 void writeAbiTags(const NamedDecl *ND,
576 const AbiTagList *AdditionalAbiTags);
577
578 // Returns sorted unique list of ABI tags.
579 AbiTagList makeFunctionReturnTypeTags(const FunctionDecl *FD);
580 // Returns sorted unique list of ABI tags.
581 AbiTagList makeVariableTypeTags(const VarDecl *VD);
582 };
583
584 }
585
shouldMangleCXXName(const NamedDecl * D)586 bool ItaniumMangleContextImpl::shouldMangleCXXName(const NamedDecl *D) {
587 const FunctionDecl *FD = dyn_cast<FunctionDecl>(D);
588 if (FD) {
589 LanguageLinkage L = FD->getLanguageLinkage();
590 // Overloadable functions need mangling.
591 if (FD->hasAttr<OverloadableAttr>())
592 return true;
593
594 // "main" is not mangled.
595 if (FD->isMain())
596 return false;
597
598 // The Windows ABI expects that we would never mangle "typical"
599 // user-defined entry points regardless of visibility or freestanding-ness.
600 //
601 // N.B. This is distinct from asking about "main". "main" has a lot of
602 // special rules associated with it in the standard while these
603 // user-defined entry points are outside of the purview of the standard.
604 // For example, there can be only one definition for "main" in a standards
605 // compliant program; however nothing forbids the existence of wmain and
606 // WinMain in the same translation unit.
607 if (FD->isMSVCRTEntryPoint())
608 return false;
609
610 // C++ functions and those whose names are not a simple identifier need
611 // mangling.
612 if (!FD->getDeclName().isIdentifier() || L == CXXLanguageLinkage)
613 return true;
614
615 // C functions are not mangled.
616 if (L == CLanguageLinkage)
617 return false;
618 }
619
620 // Otherwise, no mangling is done outside C++ mode.
621 if (!getASTContext().getLangOpts().CPlusPlus)
622 return false;
623
624 const VarDecl *VD = dyn_cast<VarDecl>(D);
625 if (VD && !isa<DecompositionDecl>(D)) {
626 // C variables are not mangled.
627 if (VD->isExternC())
628 return false;
629
630 // Variables at global scope with non-internal linkage are not mangled
631 const DeclContext *DC = getEffectiveDeclContext(D);
632 // Check for extern variable declared locally.
633 if (DC->isFunctionOrMethod() && D->hasLinkage())
634 while (!DC->isNamespace() && !DC->isTranslationUnit())
635 DC = getEffectiveParentContext(DC);
636 if (DC->isTranslationUnit() && D->getFormalLinkage() != InternalLinkage &&
637 !CXXNameMangler::shouldHaveAbiTags(*this, VD) &&
638 !isa<VarTemplateSpecializationDecl>(D))
639 return false;
640 }
641
642 return true;
643 }
644
writeAbiTags(const NamedDecl * ND,const AbiTagList * AdditionalAbiTags)645 void CXXNameMangler::writeAbiTags(const NamedDecl *ND,
646 const AbiTagList *AdditionalAbiTags) {
647 assert(AbiTags && "require AbiTagState");
648 AbiTags->write(Out, ND, DisableDerivedAbiTags ? nullptr : AdditionalAbiTags);
649 }
650
mangleSourceNameWithAbiTags(const NamedDecl * ND,const AbiTagList * AdditionalAbiTags)651 void CXXNameMangler::mangleSourceNameWithAbiTags(
652 const NamedDecl *ND, const AbiTagList *AdditionalAbiTags) {
653 mangleSourceName(ND->getIdentifier());
654 writeAbiTags(ND, AdditionalAbiTags);
655 }
656
mangle(GlobalDecl GD)657 void CXXNameMangler::mangle(GlobalDecl GD) {
658 // <mangled-name> ::= _Z <encoding>
659 // ::= <data name>
660 // ::= <special-name>
661 Out << "_Z";
662 if (isa<FunctionDecl>(GD.getDecl()))
663 mangleFunctionEncoding(GD);
664 else if (isa<VarDecl, FieldDecl, MSGuidDecl, TemplateParamObjectDecl,
665 BindingDecl>(GD.getDecl()))
666 mangleName(GD);
667 else if (const IndirectFieldDecl *IFD =
668 dyn_cast<IndirectFieldDecl>(GD.getDecl()))
669 mangleName(IFD->getAnonField());
670 else
671 llvm_unreachable("unexpected kind of global decl");
672 }
673
mangleFunctionEncoding(GlobalDecl GD)674 void CXXNameMangler::mangleFunctionEncoding(GlobalDecl GD) {
675 const FunctionDecl *FD = cast<FunctionDecl>(GD.getDecl());
676 // <encoding> ::= <function name> <bare-function-type>
677
678 // Don't mangle in the type if this isn't a decl we should typically mangle.
679 if (!Context.shouldMangleDeclName(FD)) {
680 mangleName(GD);
681 return;
682 }
683
684 AbiTagList ReturnTypeAbiTags = makeFunctionReturnTypeTags(FD);
685 if (ReturnTypeAbiTags.empty()) {
686 // There are no tags for return type, the simplest case.
687 mangleName(GD);
688 mangleFunctionEncodingBareType(FD);
689 return;
690 }
691
692 // Mangle function name and encoding to temporary buffer.
693 // We have to output name and encoding to the same mangler to get the same
694 // substitution as it will be in final mangling.
695 SmallString<256> FunctionEncodingBuf;
696 llvm::raw_svector_ostream FunctionEncodingStream(FunctionEncodingBuf);
697 CXXNameMangler FunctionEncodingMangler(*this, FunctionEncodingStream);
698 // Output name of the function.
699 FunctionEncodingMangler.disableDerivedAbiTags();
700 FunctionEncodingMangler.mangleNameWithAbiTags(FD, nullptr);
701
702 // Remember length of the function name in the buffer.
703 size_t EncodingPositionStart = FunctionEncodingStream.str().size();
704 FunctionEncodingMangler.mangleFunctionEncodingBareType(FD);
705
706 // Get tags from return type that are not present in function name or
707 // encoding.
708 const AbiTagList &UsedAbiTags =
709 FunctionEncodingMangler.AbiTagsRoot.getSortedUniqueUsedAbiTags();
710 AbiTagList AdditionalAbiTags(ReturnTypeAbiTags.size());
711 AdditionalAbiTags.erase(
712 std::set_difference(ReturnTypeAbiTags.begin(), ReturnTypeAbiTags.end(),
713 UsedAbiTags.begin(), UsedAbiTags.end(),
714 AdditionalAbiTags.begin()),
715 AdditionalAbiTags.end());
716
717 // Output name with implicit tags and function encoding from temporary buffer.
718 mangleNameWithAbiTags(FD, &AdditionalAbiTags);
719 Out << FunctionEncodingStream.str().substr(EncodingPositionStart);
720
721 // Function encoding could create new substitutions so we have to add
722 // temp mangled substitutions to main mangler.
723 extendSubstitutions(&FunctionEncodingMangler);
724 }
725
mangleFunctionEncodingBareType(const FunctionDecl * FD)726 void CXXNameMangler::mangleFunctionEncodingBareType(const FunctionDecl *FD) {
727 if (FD->hasAttr<EnableIfAttr>()) {
728 FunctionTypeDepthState Saved = FunctionTypeDepth.push();
729 Out << "Ua9enable_ifI";
730 for (AttrVec::const_iterator I = FD->getAttrs().begin(),
731 E = FD->getAttrs().end();
732 I != E; ++I) {
733 EnableIfAttr *EIA = dyn_cast<EnableIfAttr>(*I);
734 if (!EIA)
735 continue;
736 if (Context.getASTContext().getLangOpts().getClangABICompat() >
737 LangOptions::ClangABI::Ver11) {
738 mangleTemplateArgExpr(EIA->getCond());
739 } else {
740 // Prior to Clang 12, we hardcoded the X/E around enable-if's argument,
741 // even though <template-arg> should not include an X/E around
742 // <expr-primary>.
743 Out << 'X';
744 mangleExpression(EIA->getCond());
745 Out << 'E';
746 }
747 }
748 Out << 'E';
749 FunctionTypeDepth.pop(Saved);
750 }
751
752 // When mangling an inheriting constructor, the bare function type used is
753 // that of the inherited constructor.
754 if (auto *CD = dyn_cast<CXXConstructorDecl>(FD))
755 if (auto Inherited = CD->getInheritedConstructor())
756 FD = Inherited.getConstructor();
757
758 // Whether the mangling of a function type includes the return type depends on
759 // the context and the nature of the function. The rules for deciding whether
760 // the return type is included are:
761 //
762 // 1. Template functions (names or types) have return types encoded, with
763 // the exceptions listed below.
764 // 2. Function types not appearing as part of a function name mangling,
765 // e.g. parameters, pointer types, etc., have return type encoded, with the
766 // exceptions listed below.
767 // 3. Non-template function names do not have return types encoded.
768 //
769 // The exceptions mentioned in (1) and (2) above, for which the return type is
770 // never included, are
771 // 1. Constructors.
772 // 2. Destructors.
773 // 3. Conversion operator functions, e.g. operator int.
774 bool MangleReturnType = false;
775 if (FunctionTemplateDecl *PrimaryTemplate = FD->getPrimaryTemplate()) {
776 if (!(isa<CXXConstructorDecl>(FD) || isa<CXXDestructorDecl>(FD) ||
777 isa<CXXConversionDecl>(FD)))
778 MangleReturnType = true;
779
780 // Mangle the type of the primary template.
781 FD = PrimaryTemplate->getTemplatedDecl();
782 }
783
784 mangleBareFunctionType(FD->getType()->castAs<FunctionProtoType>(),
785 MangleReturnType, FD);
786 }
787
IgnoreLinkageSpecDecls(const DeclContext * DC)788 static const DeclContext *IgnoreLinkageSpecDecls(const DeclContext *DC) {
789 while (isa<LinkageSpecDecl>(DC)) {
790 DC = getEffectiveParentContext(DC);
791 }
792
793 return DC;
794 }
795
796 /// Return whether a given namespace is the 'std' namespace.
isStd(const NamespaceDecl * NS)797 static bool isStd(const NamespaceDecl *NS) {
798 if (!IgnoreLinkageSpecDecls(getEffectiveParentContext(NS))
799 ->isTranslationUnit())
800 return false;
801
802 const IdentifierInfo *II = NS->getOriginalNamespace()->getIdentifier();
803 return II && II->isStr("std");
804 }
805
806 // isStdNamespace - Return whether a given decl context is a toplevel 'std'
807 // namespace.
isStdNamespace(const DeclContext * DC)808 static bool isStdNamespace(const DeclContext *DC) {
809 if (!DC->isNamespace())
810 return false;
811
812 return isStd(cast<NamespaceDecl>(DC));
813 }
814
815 static const GlobalDecl
isTemplate(GlobalDecl GD,const TemplateArgumentList * & TemplateArgs)816 isTemplate(GlobalDecl GD, const TemplateArgumentList *&TemplateArgs) {
817 const NamedDecl *ND = cast<NamedDecl>(GD.getDecl());
818 // Check if we have a function template.
819 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(ND)) {
820 if (const TemplateDecl *TD = FD->getPrimaryTemplate()) {
821 TemplateArgs = FD->getTemplateSpecializationArgs();
822 return GD.getWithDecl(TD);
823 }
824 }
825
826 // Check if we have a class template.
827 if (const ClassTemplateSpecializationDecl *Spec =
828 dyn_cast<ClassTemplateSpecializationDecl>(ND)) {
829 TemplateArgs = &Spec->getTemplateArgs();
830 return GD.getWithDecl(Spec->getSpecializedTemplate());
831 }
832
833 // Check if we have a variable template.
834 if (const VarTemplateSpecializationDecl *Spec =
835 dyn_cast<VarTemplateSpecializationDecl>(ND)) {
836 TemplateArgs = &Spec->getTemplateArgs();
837 return GD.getWithDecl(Spec->getSpecializedTemplate());
838 }
839
840 return GlobalDecl();
841 }
842
asTemplateName(GlobalDecl GD)843 static TemplateName asTemplateName(GlobalDecl GD) {
844 const TemplateDecl *TD = dyn_cast_or_null<TemplateDecl>(GD.getDecl());
845 return TemplateName(const_cast<TemplateDecl*>(TD));
846 }
847
mangleName(GlobalDecl GD)848 void CXXNameMangler::mangleName(GlobalDecl GD) {
849 const NamedDecl *ND = cast<NamedDecl>(GD.getDecl());
850 if (const VarDecl *VD = dyn_cast<VarDecl>(ND)) {
851 // Variables should have implicit tags from its type.
852 AbiTagList VariableTypeAbiTags = makeVariableTypeTags(VD);
853 if (VariableTypeAbiTags.empty()) {
854 // Simple case no variable type tags.
855 mangleNameWithAbiTags(VD, nullptr);
856 return;
857 }
858
859 // Mangle variable name to null stream to collect tags.
860 llvm::raw_null_ostream NullOutStream;
861 CXXNameMangler VariableNameMangler(*this, NullOutStream);
862 VariableNameMangler.disableDerivedAbiTags();
863 VariableNameMangler.mangleNameWithAbiTags(VD, nullptr);
864
865 // Get tags from variable type that are not present in its name.
866 const AbiTagList &UsedAbiTags =
867 VariableNameMangler.AbiTagsRoot.getSortedUniqueUsedAbiTags();
868 AbiTagList AdditionalAbiTags(VariableTypeAbiTags.size());
869 AdditionalAbiTags.erase(
870 std::set_difference(VariableTypeAbiTags.begin(),
871 VariableTypeAbiTags.end(), UsedAbiTags.begin(),
872 UsedAbiTags.end(), AdditionalAbiTags.begin()),
873 AdditionalAbiTags.end());
874
875 // Output name with implicit tags.
876 mangleNameWithAbiTags(VD, &AdditionalAbiTags);
877 } else {
878 mangleNameWithAbiTags(GD, nullptr);
879 }
880 }
881
mangleNameWithAbiTags(GlobalDecl GD,const AbiTagList * AdditionalAbiTags)882 void CXXNameMangler::mangleNameWithAbiTags(GlobalDecl GD,
883 const AbiTagList *AdditionalAbiTags) {
884 const NamedDecl *ND = cast<NamedDecl>(GD.getDecl());
885 // <name> ::= [<module-name>] <nested-name>
886 // ::= [<module-name>] <unscoped-name>
887 // ::= [<module-name>] <unscoped-template-name> <template-args>
888 // ::= <local-name>
889 //
890 const DeclContext *DC = getEffectiveDeclContext(ND);
891
892 // If this is an extern variable declared locally, the relevant DeclContext
893 // is that of the containing namespace, or the translation unit.
894 // FIXME: This is a hack; extern variables declared locally should have
895 // a proper semantic declaration context!
896 if (isLocalContainerContext(DC) && ND->hasLinkage() && !isLambda(ND))
897 while (!DC->isNamespace() && !DC->isTranslationUnit())
898 DC = getEffectiveParentContext(DC);
899 else if (GetLocalClassDecl(ND)) {
900 mangleLocalName(GD, AdditionalAbiTags);
901 return;
902 }
903
904 DC = IgnoreLinkageSpecDecls(DC);
905
906 if (isLocalContainerContext(DC)) {
907 mangleLocalName(GD, AdditionalAbiTags);
908 return;
909 }
910
911 // Do not mangle the owning module for an external linkage declaration.
912 // This enables backwards-compatibility with non-modular code, and is
913 // a valid choice since conflicts are not permitted by C++ Modules TS
914 // [basic.def.odr]/6.2.
915 if (!ND->hasExternalFormalLinkage())
916 if (Module *M = ND->getOwningModuleForLinkage())
917 mangleModuleName(M);
918
919 if (DC->isTranslationUnit() || isStdNamespace(DC)) {
920 // Check if we have a template.
921 const TemplateArgumentList *TemplateArgs = nullptr;
922 if (GlobalDecl TD = isTemplate(GD, TemplateArgs)) {
923 mangleUnscopedTemplateName(TD, AdditionalAbiTags);
924 mangleTemplateArgs(asTemplateName(TD), *TemplateArgs);
925 return;
926 }
927
928 mangleUnscopedName(GD, AdditionalAbiTags);
929 return;
930 }
931
932 mangleNestedName(GD, DC, AdditionalAbiTags);
933 }
934
mangleModuleName(const Module * M)935 void CXXNameMangler::mangleModuleName(const Module *M) {
936 // Implement the C++ Modules TS name mangling proposal; see
937 // https://gcc.gnu.org/wiki/cxx-modules?action=AttachFile
938 //
939 // <module-name> ::= W <unscoped-name>+ E
940 // ::= W <module-subst> <unscoped-name>* E
941 Out << 'W';
942 mangleModuleNamePrefix(M->Name);
943 Out << 'E';
944 }
945
mangleModuleNamePrefix(StringRef Name)946 void CXXNameMangler::mangleModuleNamePrefix(StringRef Name) {
947 // <module-subst> ::= _ <seq-id> # 0 < seq-id < 10
948 // ::= W <seq-id - 10> _ # otherwise
949 auto It = ModuleSubstitutions.find(Name);
950 if (It != ModuleSubstitutions.end()) {
951 if (It->second < 10)
952 Out << '_' << static_cast<char>('0' + It->second);
953 else
954 Out << 'W' << (It->second - 10) << '_';
955 return;
956 }
957
958 // FIXME: Preserve hierarchy in module names rather than flattening
959 // them to strings; use Module*s as substitution keys.
960 auto Parts = Name.rsplit('.');
961 if (Parts.second.empty())
962 Parts.second = Parts.first;
963 else
964 mangleModuleNamePrefix(Parts.first);
965
966 Out << Parts.second.size() << Parts.second;
967 ModuleSubstitutions.insert({Name, ModuleSubstitutions.size()});
968 }
969
mangleTemplateName(const TemplateDecl * TD,const TemplateArgument * TemplateArgs,unsigned NumTemplateArgs)970 void CXXNameMangler::mangleTemplateName(const TemplateDecl *TD,
971 const TemplateArgument *TemplateArgs,
972 unsigned NumTemplateArgs) {
973 const DeclContext *DC = IgnoreLinkageSpecDecls(getEffectiveDeclContext(TD));
974
975 if (DC->isTranslationUnit() || isStdNamespace(DC)) {
976 mangleUnscopedTemplateName(TD, nullptr);
977 mangleTemplateArgs(asTemplateName(TD), TemplateArgs, NumTemplateArgs);
978 } else {
979 mangleNestedName(TD, TemplateArgs, NumTemplateArgs);
980 }
981 }
982
mangleUnscopedName(GlobalDecl GD,const AbiTagList * AdditionalAbiTags)983 void CXXNameMangler::mangleUnscopedName(GlobalDecl GD,
984 const AbiTagList *AdditionalAbiTags) {
985 const NamedDecl *ND = cast<NamedDecl>(GD.getDecl());
986 // <unscoped-name> ::= <unqualified-name>
987 // ::= St <unqualified-name> # ::std::
988
989 if (isStdNamespace(IgnoreLinkageSpecDecls(getEffectiveDeclContext(ND))))
990 Out << "St";
991
992 mangleUnqualifiedName(GD, AdditionalAbiTags);
993 }
994
mangleUnscopedTemplateName(GlobalDecl GD,const AbiTagList * AdditionalAbiTags)995 void CXXNameMangler::mangleUnscopedTemplateName(
996 GlobalDecl GD, const AbiTagList *AdditionalAbiTags) {
997 const TemplateDecl *ND = cast<TemplateDecl>(GD.getDecl());
998 // <unscoped-template-name> ::= <unscoped-name>
999 // ::= <substitution>
1000 if (mangleSubstitution(ND))
1001 return;
1002
1003 // <template-template-param> ::= <template-param>
1004 if (const auto *TTP = dyn_cast<TemplateTemplateParmDecl>(ND)) {
1005 assert(!AdditionalAbiTags &&
1006 "template template param cannot have abi tags");
1007 mangleTemplateParameter(TTP->getDepth(), TTP->getIndex());
1008 } else if (isa<BuiltinTemplateDecl>(ND) || isa<ConceptDecl>(ND)) {
1009 mangleUnscopedName(GD, AdditionalAbiTags);
1010 } else {
1011 mangleUnscopedName(GD.getWithDecl(ND->getTemplatedDecl()), AdditionalAbiTags);
1012 }
1013
1014 addSubstitution(ND);
1015 }
1016
mangleFloat(const llvm::APFloat & f)1017 void CXXNameMangler::mangleFloat(const llvm::APFloat &f) {
1018 // ABI:
1019 // Floating-point literals are encoded using a fixed-length
1020 // lowercase hexadecimal string corresponding to the internal
1021 // representation (IEEE on Itanium), high-order bytes first,
1022 // without leading zeroes. For example: "Lf bf800000 E" is -1.0f
1023 // on Itanium.
1024 // The 'without leading zeroes' thing seems to be an editorial
1025 // mistake; see the discussion on cxx-abi-dev beginning on
1026 // 2012-01-16.
1027
1028 // Our requirements here are just barely weird enough to justify
1029 // using a custom algorithm instead of post-processing APInt::toString().
1030
1031 llvm::APInt valueBits = f.bitcastToAPInt();
1032 unsigned numCharacters = (valueBits.getBitWidth() + 3) / 4;
1033 assert(numCharacters != 0);
1034
1035 // Allocate a buffer of the right number of characters.
1036 SmallVector<char, 20> buffer(numCharacters);
1037
1038 // Fill the buffer left-to-right.
1039 for (unsigned stringIndex = 0; stringIndex != numCharacters; ++stringIndex) {
1040 // The bit-index of the next hex digit.
1041 unsigned digitBitIndex = 4 * (numCharacters - stringIndex - 1);
1042
1043 // Project out 4 bits starting at 'digitIndex'.
1044 uint64_t hexDigit = valueBits.getRawData()[digitBitIndex / 64];
1045 hexDigit >>= (digitBitIndex % 64);
1046 hexDigit &= 0xF;
1047
1048 // Map that over to a lowercase hex digit.
1049 static const char charForHex[16] = {
1050 '0', '1', '2', '3', '4', '5', '6', '7',
1051 '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
1052 };
1053 buffer[stringIndex] = charForHex[hexDigit];
1054 }
1055
1056 Out.write(buffer.data(), numCharacters);
1057 }
1058
mangleFloatLiteral(QualType T,const llvm::APFloat & V)1059 void CXXNameMangler::mangleFloatLiteral(QualType T, const llvm::APFloat &V) {
1060 Out << 'L';
1061 mangleType(T);
1062 mangleFloat(V);
1063 Out << 'E';
1064 }
1065
mangleFixedPointLiteral()1066 void CXXNameMangler::mangleFixedPointLiteral() {
1067 DiagnosticsEngine &Diags = Context.getDiags();
1068 unsigned DiagID = Diags.getCustomDiagID(
1069 DiagnosticsEngine::Error, "cannot mangle fixed point literals yet");
1070 Diags.Report(DiagID);
1071 }
1072
mangleNullPointer(QualType T)1073 void CXXNameMangler::mangleNullPointer(QualType T) {
1074 // <expr-primary> ::= L <type> 0 E
1075 Out << 'L';
1076 mangleType(T);
1077 Out << "0E";
1078 }
1079
mangleNumber(const llvm::APSInt & Value)1080 void CXXNameMangler::mangleNumber(const llvm::APSInt &Value) {
1081 if (Value.isSigned() && Value.isNegative()) {
1082 Out << 'n';
1083 Value.abs().print(Out, /*signed*/ false);
1084 } else {
1085 Value.print(Out, /*signed*/ false);
1086 }
1087 }
1088
mangleNumber(int64_t Number)1089 void CXXNameMangler::mangleNumber(int64_t Number) {
1090 // <number> ::= [n] <non-negative decimal integer>
1091 if (Number < 0) {
1092 Out << 'n';
1093 Number = -Number;
1094 }
1095
1096 Out << Number;
1097 }
1098
mangleCallOffset(int64_t NonVirtual,int64_t Virtual)1099 void CXXNameMangler::mangleCallOffset(int64_t NonVirtual, int64_t Virtual) {
1100 // <call-offset> ::= h <nv-offset> _
1101 // ::= v <v-offset> _
1102 // <nv-offset> ::= <offset number> # non-virtual base override
1103 // <v-offset> ::= <offset number> _ <virtual offset number>
1104 // # virtual base override, with vcall offset
1105 if (!Virtual) {
1106 Out << 'h';
1107 mangleNumber(NonVirtual);
1108 Out << '_';
1109 return;
1110 }
1111
1112 Out << 'v';
1113 mangleNumber(NonVirtual);
1114 Out << '_';
1115 mangleNumber(Virtual);
1116 Out << '_';
1117 }
1118
manglePrefix(QualType type)1119 void CXXNameMangler::manglePrefix(QualType type) {
1120 if (const auto *TST = type->getAs<TemplateSpecializationType>()) {
1121 if (!mangleSubstitution(QualType(TST, 0))) {
1122 mangleTemplatePrefix(TST->getTemplateName());
1123
1124 // FIXME: GCC does not appear to mangle the template arguments when
1125 // the template in question is a dependent template name. Should we
1126 // emulate that badness?
1127 mangleTemplateArgs(TST->getTemplateName(), TST->getArgs(),
1128 TST->getNumArgs());
1129 addSubstitution(QualType(TST, 0));
1130 }
1131 } else if (const auto *DTST =
1132 type->getAs<DependentTemplateSpecializationType>()) {
1133 if (!mangleSubstitution(QualType(DTST, 0))) {
1134 TemplateName Template = getASTContext().getDependentTemplateName(
1135 DTST->getQualifier(), DTST->getIdentifier());
1136 mangleTemplatePrefix(Template);
1137
1138 // FIXME: GCC does not appear to mangle the template arguments when
1139 // the template in question is a dependent template name. Should we
1140 // emulate that badness?
1141 mangleTemplateArgs(Template, DTST->getArgs(), DTST->getNumArgs());
1142 addSubstitution(QualType(DTST, 0));
1143 }
1144 } else {
1145 // We use the QualType mangle type variant here because it handles
1146 // substitutions.
1147 mangleType(type);
1148 }
1149 }
1150
1151 /// Mangle everything prior to the base-unresolved-name in an unresolved-name.
1152 ///
1153 /// \param recursive - true if this is being called recursively,
1154 /// i.e. if there is more prefix "to the right".
mangleUnresolvedPrefix(NestedNameSpecifier * qualifier,bool recursive)1155 void CXXNameMangler::mangleUnresolvedPrefix(NestedNameSpecifier *qualifier,
1156 bool recursive) {
1157
1158 // x, ::x
1159 // <unresolved-name> ::= [gs] <base-unresolved-name>
1160
1161 // T::x / decltype(p)::x
1162 // <unresolved-name> ::= sr <unresolved-type> <base-unresolved-name>
1163
1164 // T::N::x /decltype(p)::N::x
1165 // <unresolved-name> ::= srN <unresolved-type> <unresolved-qualifier-level>+ E
1166 // <base-unresolved-name>
1167
1168 // A::x, N::y, A<T>::z; "gs" means leading "::"
1169 // <unresolved-name> ::= [gs] sr <unresolved-qualifier-level>+ E
1170 // <base-unresolved-name>
1171
1172 switch (qualifier->getKind()) {
1173 case NestedNameSpecifier::Global:
1174 Out << "gs";
1175
1176 // We want an 'sr' unless this is the entire NNS.
1177 if (recursive)
1178 Out << "sr";
1179
1180 // We never want an 'E' here.
1181 return;
1182
1183 case NestedNameSpecifier::Super:
1184 llvm_unreachable("Can't mangle __super specifier");
1185
1186 case NestedNameSpecifier::Namespace:
1187 if (qualifier->getPrefix())
1188 mangleUnresolvedPrefix(qualifier->getPrefix(),
1189 /*recursive*/ true);
1190 else
1191 Out << "sr";
1192 mangleSourceNameWithAbiTags(qualifier->getAsNamespace());
1193 break;
1194 case NestedNameSpecifier::NamespaceAlias:
1195 if (qualifier->getPrefix())
1196 mangleUnresolvedPrefix(qualifier->getPrefix(),
1197 /*recursive*/ true);
1198 else
1199 Out << "sr";
1200 mangleSourceNameWithAbiTags(qualifier->getAsNamespaceAlias());
1201 break;
1202
1203 case NestedNameSpecifier::TypeSpec:
1204 case NestedNameSpecifier::TypeSpecWithTemplate: {
1205 const Type *type = qualifier->getAsType();
1206
1207 // We only want to use an unresolved-type encoding if this is one of:
1208 // - a decltype
1209 // - a template type parameter
1210 // - a template template parameter with arguments
1211 // In all of these cases, we should have no prefix.
1212 if (qualifier->getPrefix()) {
1213 mangleUnresolvedPrefix(qualifier->getPrefix(),
1214 /*recursive*/ true);
1215 } else {
1216 // Otherwise, all the cases want this.
1217 Out << "sr";
1218 }
1219
1220 if (mangleUnresolvedTypeOrSimpleId(QualType(type, 0), recursive ? "N" : ""))
1221 return;
1222
1223 break;
1224 }
1225
1226 case NestedNameSpecifier::Identifier:
1227 // Member expressions can have these without prefixes.
1228 if (qualifier->getPrefix())
1229 mangleUnresolvedPrefix(qualifier->getPrefix(),
1230 /*recursive*/ true);
1231 else
1232 Out << "sr";
1233
1234 mangleSourceName(qualifier->getAsIdentifier());
1235 // An Identifier has no type information, so we can't emit abi tags for it.
1236 break;
1237 }
1238
1239 // If this was the innermost part of the NNS, and we fell out to
1240 // here, append an 'E'.
1241 if (!recursive)
1242 Out << 'E';
1243 }
1244
1245 /// Mangle an unresolved-name, which is generally used for names which
1246 /// weren't resolved to specific entities.
mangleUnresolvedName(NestedNameSpecifier * qualifier,DeclarationName name,const TemplateArgumentLoc * TemplateArgs,unsigned NumTemplateArgs,unsigned knownArity)1247 void CXXNameMangler::mangleUnresolvedName(
1248 NestedNameSpecifier *qualifier, DeclarationName name,
1249 const TemplateArgumentLoc *TemplateArgs, unsigned NumTemplateArgs,
1250 unsigned knownArity) {
1251 if (qualifier) mangleUnresolvedPrefix(qualifier);
1252 switch (name.getNameKind()) {
1253 // <base-unresolved-name> ::= <simple-id>
1254 case DeclarationName::Identifier:
1255 mangleSourceName(name.getAsIdentifierInfo());
1256 break;
1257 // <base-unresolved-name> ::= dn <destructor-name>
1258 case DeclarationName::CXXDestructorName:
1259 Out << "dn";
1260 mangleUnresolvedTypeOrSimpleId(name.getCXXNameType());
1261 break;
1262 // <base-unresolved-name> ::= on <operator-name>
1263 case DeclarationName::CXXConversionFunctionName:
1264 case DeclarationName::CXXLiteralOperatorName:
1265 case DeclarationName::CXXOperatorName:
1266 Out << "on";
1267 mangleOperatorName(name, knownArity);
1268 break;
1269 case DeclarationName::CXXConstructorName:
1270 llvm_unreachable("Can't mangle a constructor name!");
1271 case DeclarationName::CXXUsingDirective:
1272 llvm_unreachable("Can't mangle a using directive name!");
1273 case DeclarationName::CXXDeductionGuideName:
1274 llvm_unreachable("Can't mangle a deduction guide name!");
1275 case DeclarationName::ObjCMultiArgSelector:
1276 case DeclarationName::ObjCOneArgSelector:
1277 case DeclarationName::ObjCZeroArgSelector:
1278 llvm_unreachable("Can't mangle Objective-C selector names here!");
1279 }
1280
1281 // The <simple-id> and on <operator-name> productions end in an optional
1282 // <template-args>.
1283 if (TemplateArgs)
1284 mangleTemplateArgs(TemplateName(), TemplateArgs, NumTemplateArgs);
1285 }
1286
mangleUnqualifiedName(GlobalDecl GD,DeclarationName Name,unsigned KnownArity,const AbiTagList * AdditionalAbiTags)1287 void CXXNameMangler::mangleUnqualifiedName(GlobalDecl GD,
1288 DeclarationName Name,
1289 unsigned KnownArity,
1290 const AbiTagList *AdditionalAbiTags) {
1291 const NamedDecl *ND = cast_or_null<NamedDecl>(GD.getDecl());
1292 unsigned Arity = KnownArity;
1293 // <unqualified-name> ::= <operator-name>
1294 // ::= <ctor-dtor-name>
1295 // ::= <source-name>
1296 switch (Name.getNameKind()) {
1297 case DeclarationName::Identifier: {
1298 const IdentifierInfo *II = Name.getAsIdentifierInfo();
1299
1300 // We mangle decomposition declarations as the names of their bindings.
1301 if (auto *DD = dyn_cast<DecompositionDecl>(ND)) {
1302 // FIXME: Non-standard mangling for decomposition declarations:
1303 //
1304 // <unqualified-name> ::= DC <source-name>* E
1305 //
1306 // These can never be referenced across translation units, so we do
1307 // not need a cross-vendor mangling for anything other than demanglers.
1308 // Proposed on cxx-abi-dev on 2016-08-12
1309 Out << "DC";
1310 for (auto *BD : DD->bindings())
1311 mangleSourceName(BD->getDeclName().getAsIdentifierInfo());
1312 Out << 'E';
1313 writeAbiTags(ND, AdditionalAbiTags);
1314 break;
1315 }
1316
1317 if (auto *GD = dyn_cast<MSGuidDecl>(ND)) {
1318 // We follow MSVC in mangling GUID declarations as if they were variables
1319 // with a particular reserved name. Continue the pretense here.
1320 SmallString<sizeof("_GUID_12345678_1234_1234_1234_1234567890ab")> GUID;
1321 llvm::raw_svector_ostream GUIDOS(GUID);
1322 Context.mangleMSGuidDecl(GD, GUIDOS);
1323 Out << GUID.size() << GUID;
1324 break;
1325 }
1326
1327 if (auto *TPO = dyn_cast<TemplateParamObjectDecl>(ND)) {
1328 // Proposed in https://github.com/itanium-cxx-abi/cxx-abi/issues/63.
1329 Out << "TA";
1330 mangleValueInTemplateArg(TPO->getType().getUnqualifiedType(),
1331 TPO->getValue(), /*TopLevel=*/true);
1332 break;
1333 }
1334
1335 if (II) {
1336 // Match GCC's naming convention for internal linkage symbols, for
1337 // symbols that are not actually visible outside of this TU. GCC
1338 // distinguishes between internal and external linkage symbols in
1339 // its mangling, to support cases like this that were valid C++ prior
1340 // to DR426:
1341 //
1342 // void test() { extern void foo(); }
1343 // static void foo();
1344 //
1345 // Don't bother with the L marker for names in anonymous namespaces; the
1346 // 12_GLOBAL__N_1 mangling is quite sufficient there, and this better
1347 // matches GCC anyway, because GCC does not treat anonymous namespaces as
1348 // implying internal linkage.
1349 if (ND && ND->getFormalLinkage() == InternalLinkage &&
1350 !ND->isExternallyVisible() &&
1351 getEffectiveDeclContext(ND)->isFileContext() &&
1352 !ND->isInAnonymousNamespace())
1353 Out << 'L';
1354
1355 auto *FD = dyn_cast<FunctionDecl>(ND);
1356 bool IsRegCall = FD &&
1357 FD->getType()->castAs<FunctionType>()->getCallConv() ==
1358 clang::CC_X86RegCall;
1359 bool IsDeviceStub =
1360 FD && FD->hasAttr<CUDAGlobalAttr>() &&
1361 GD.getKernelReferenceKind() == KernelReferenceKind::Stub;
1362 if (IsDeviceStub)
1363 mangleDeviceStubName(II);
1364 else if (IsRegCall)
1365 mangleRegCallName(II);
1366 else
1367 mangleSourceName(II);
1368
1369 writeAbiTags(ND, AdditionalAbiTags);
1370 break;
1371 }
1372
1373 // Otherwise, an anonymous entity. We must have a declaration.
1374 assert(ND && "mangling empty name without declaration");
1375
1376 if (const NamespaceDecl *NS = dyn_cast<NamespaceDecl>(ND)) {
1377 if (NS->isAnonymousNamespace()) {
1378 // This is how gcc mangles these names.
1379 Out << "12_GLOBAL__N_1";
1380 break;
1381 }
1382 }
1383
1384 if (const VarDecl *VD = dyn_cast<VarDecl>(ND)) {
1385 // We must have an anonymous union or struct declaration.
1386 const RecordDecl *RD = VD->getType()->castAs<RecordType>()->getDecl();
1387
1388 // Itanium C++ ABI 5.1.2:
1389 //
1390 // For the purposes of mangling, the name of an anonymous union is
1391 // considered to be the name of the first named data member found by a
1392 // pre-order, depth-first, declaration-order walk of the data members of
1393 // the anonymous union. If there is no such data member (i.e., if all of
1394 // the data members in the union are unnamed), then there is no way for
1395 // a program to refer to the anonymous union, and there is therefore no
1396 // need to mangle its name.
1397 assert(RD->isAnonymousStructOrUnion()
1398 && "Expected anonymous struct or union!");
1399 const FieldDecl *FD = RD->findFirstNamedDataMember();
1400
1401 // It's actually possible for various reasons for us to get here
1402 // with an empty anonymous struct / union. Fortunately, it
1403 // doesn't really matter what name we generate.
1404 if (!FD) break;
1405 assert(FD->getIdentifier() && "Data member name isn't an identifier!");
1406
1407 mangleSourceName(FD->getIdentifier());
1408 // Not emitting abi tags: internal name anyway.
1409 break;
1410 }
1411
1412 // Class extensions have no name as a category, and it's possible
1413 // for them to be the semantic parent of certain declarations
1414 // (primarily, tag decls defined within declarations). Such
1415 // declarations will always have internal linkage, so the name
1416 // doesn't really matter, but we shouldn't crash on them. For
1417 // safety, just handle all ObjC containers here.
1418 if (isa<ObjCContainerDecl>(ND))
1419 break;
1420
1421 // We must have an anonymous struct.
1422 const TagDecl *TD = cast<TagDecl>(ND);
1423 if (const TypedefNameDecl *D = TD->getTypedefNameForAnonDecl()) {
1424 assert(TD->getDeclContext() == D->getDeclContext() &&
1425 "Typedef should not be in another decl context!");
1426 assert(D->getDeclName().getAsIdentifierInfo() &&
1427 "Typedef was not named!");
1428 mangleSourceName(D->getDeclName().getAsIdentifierInfo());
1429 assert(!AdditionalAbiTags && "Type cannot have additional abi tags");
1430 // Explicit abi tags are still possible; take from underlying type, not
1431 // from typedef.
1432 writeAbiTags(TD, nullptr);
1433 break;
1434 }
1435
1436 // <unnamed-type-name> ::= <closure-type-name>
1437 //
1438 // <closure-type-name> ::= Ul <lambda-sig> E [ <nonnegative number> ] _
1439 // <lambda-sig> ::= <template-param-decl>* <parameter-type>+
1440 // # Parameter types or 'v' for 'void'.
1441 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(TD)) {
1442 if (Record->isLambda() && Record->getLambdaManglingNumber()) {
1443 assert(!AdditionalAbiTags &&
1444 "Lambda type cannot have additional abi tags");
1445 mangleLambda(Record);
1446 break;
1447 }
1448 }
1449
1450 if (TD->isExternallyVisible()) {
1451 unsigned UnnamedMangle = getASTContext().getManglingNumber(TD);
1452 Out << "Ut";
1453 if (UnnamedMangle > 1)
1454 Out << UnnamedMangle - 2;
1455 Out << '_';
1456 writeAbiTags(TD, AdditionalAbiTags);
1457 break;
1458 }
1459
1460 // Get a unique id for the anonymous struct. If it is not a real output
1461 // ID doesn't matter so use fake one.
1462 unsigned AnonStructId = NullOut ? 0 : Context.getAnonymousStructId(TD);
1463
1464 // Mangle it as a source name in the form
1465 // [n] $_<id>
1466 // where n is the length of the string.
1467 SmallString<8> Str;
1468 Str += "$_";
1469 Str += llvm::utostr(AnonStructId);
1470
1471 Out << Str.size();
1472 Out << Str;
1473 break;
1474 }
1475
1476 case DeclarationName::ObjCZeroArgSelector:
1477 case DeclarationName::ObjCOneArgSelector:
1478 case DeclarationName::ObjCMultiArgSelector:
1479 llvm_unreachable("Can't mangle Objective-C selector names here!");
1480
1481 case DeclarationName::CXXConstructorName: {
1482 const CXXRecordDecl *InheritedFrom = nullptr;
1483 TemplateName InheritedTemplateName;
1484 const TemplateArgumentList *InheritedTemplateArgs = nullptr;
1485 if (auto Inherited =
1486 cast<CXXConstructorDecl>(ND)->getInheritedConstructor()) {
1487 InheritedFrom = Inherited.getConstructor()->getParent();
1488 InheritedTemplateName =
1489 TemplateName(Inherited.getConstructor()->getPrimaryTemplate());
1490 InheritedTemplateArgs =
1491 Inherited.getConstructor()->getTemplateSpecializationArgs();
1492 }
1493
1494 if (ND == Structor)
1495 // If the named decl is the C++ constructor we're mangling, use the type
1496 // we were given.
1497 mangleCXXCtorType(static_cast<CXXCtorType>(StructorType), InheritedFrom);
1498 else
1499 // Otherwise, use the complete constructor name. This is relevant if a
1500 // class with a constructor is declared within a constructor.
1501 mangleCXXCtorType(Ctor_Complete, InheritedFrom);
1502
1503 // FIXME: The template arguments are part of the enclosing prefix or
1504 // nested-name, but it's more convenient to mangle them here.
1505 if (InheritedTemplateArgs)
1506 mangleTemplateArgs(InheritedTemplateName, *InheritedTemplateArgs);
1507
1508 writeAbiTags(ND, AdditionalAbiTags);
1509 break;
1510 }
1511
1512 case DeclarationName::CXXDestructorName:
1513 if (ND == Structor)
1514 // If the named decl is the C++ destructor we're mangling, use the type we
1515 // were given.
1516 mangleCXXDtorType(static_cast<CXXDtorType>(StructorType));
1517 else
1518 // Otherwise, use the complete destructor name. This is relevant if a
1519 // class with a destructor is declared within a destructor.
1520 mangleCXXDtorType(Dtor_Complete);
1521 writeAbiTags(ND, AdditionalAbiTags);
1522 break;
1523
1524 case DeclarationName::CXXOperatorName:
1525 if (ND && Arity == UnknownArity) {
1526 Arity = cast<FunctionDecl>(ND)->getNumParams();
1527
1528 // If we have a member function, we need to include the 'this' pointer.
1529 if (const auto *MD = dyn_cast<CXXMethodDecl>(ND))
1530 if (!MD->isStatic())
1531 Arity++;
1532 }
1533 LLVM_FALLTHROUGH;
1534 case DeclarationName::CXXConversionFunctionName:
1535 case DeclarationName::CXXLiteralOperatorName:
1536 mangleOperatorName(Name, Arity);
1537 writeAbiTags(ND, AdditionalAbiTags);
1538 break;
1539
1540 case DeclarationName::CXXDeductionGuideName:
1541 llvm_unreachable("Can't mangle a deduction guide name!");
1542
1543 case DeclarationName::CXXUsingDirective:
1544 llvm_unreachable("Can't mangle a using directive name!");
1545 }
1546 }
1547
mangleRegCallName(const IdentifierInfo * II)1548 void CXXNameMangler::mangleRegCallName(const IdentifierInfo *II) {
1549 // <source-name> ::= <positive length number> __regcall3__ <identifier>
1550 // <number> ::= [n] <non-negative decimal integer>
1551 // <identifier> ::= <unqualified source code identifier>
1552 Out << II->getLength() + sizeof("__regcall3__") - 1 << "__regcall3__"
1553 << II->getName();
1554 }
1555
mangleDeviceStubName(const IdentifierInfo * II)1556 void CXXNameMangler::mangleDeviceStubName(const IdentifierInfo *II) {
1557 // <source-name> ::= <positive length number> __device_stub__ <identifier>
1558 // <number> ::= [n] <non-negative decimal integer>
1559 // <identifier> ::= <unqualified source code identifier>
1560 Out << II->getLength() + sizeof("__device_stub__") - 1 << "__device_stub__"
1561 << II->getName();
1562 }
1563
mangleSourceName(const IdentifierInfo * II)1564 void CXXNameMangler::mangleSourceName(const IdentifierInfo *II) {
1565 // <source-name> ::= <positive length number> <identifier>
1566 // <number> ::= [n] <non-negative decimal integer>
1567 // <identifier> ::= <unqualified source code identifier>
1568 Out << II->getLength() << II->getName();
1569 }
1570
mangleNestedName(GlobalDecl GD,const DeclContext * DC,const AbiTagList * AdditionalAbiTags,bool NoFunction)1571 void CXXNameMangler::mangleNestedName(GlobalDecl GD,
1572 const DeclContext *DC,
1573 const AbiTagList *AdditionalAbiTags,
1574 bool NoFunction) {
1575 const NamedDecl *ND = cast<NamedDecl>(GD.getDecl());
1576 // <nested-name>
1577 // ::= N [<CV-qualifiers>] [<ref-qualifier>] <prefix> <unqualified-name> E
1578 // ::= N [<CV-qualifiers>] [<ref-qualifier>] <template-prefix>
1579 // <template-args> E
1580
1581 Out << 'N';
1582 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(ND)) {
1583 Qualifiers MethodQuals = Method->getMethodQualifiers();
1584 // We do not consider restrict a distinguishing attribute for overloading
1585 // purposes so we must not mangle it.
1586 MethodQuals.removeRestrict();
1587 mangleQualifiers(MethodQuals);
1588 mangleRefQualifier(Method->getRefQualifier());
1589 }
1590
1591 // Check if we have a template.
1592 const TemplateArgumentList *TemplateArgs = nullptr;
1593 if (GlobalDecl TD = isTemplate(GD, TemplateArgs)) {
1594 mangleTemplatePrefix(TD, NoFunction);
1595 mangleTemplateArgs(asTemplateName(TD), *TemplateArgs);
1596 }
1597 else {
1598 manglePrefix(DC, NoFunction);
1599 mangleUnqualifiedName(GD, AdditionalAbiTags);
1600 }
1601
1602 Out << 'E';
1603 }
mangleNestedName(const TemplateDecl * TD,const TemplateArgument * TemplateArgs,unsigned NumTemplateArgs)1604 void CXXNameMangler::mangleNestedName(const TemplateDecl *TD,
1605 const TemplateArgument *TemplateArgs,
1606 unsigned NumTemplateArgs) {
1607 // <nested-name> ::= N [<CV-qualifiers>] <template-prefix> <template-args> E
1608
1609 Out << 'N';
1610
1611 mangleTemplatePrefix(TD);
1612 mangleTemplateArgs(asTemplateName(TD), TemplateArgs, NumTemplateArgs);
1613
1614 Out << 'E';
1615 }
1616
getParentOfLocalEntity(const DeclContext * DC)1617 static GlobalDecl getParentOfLocalEntity(const DeclContext *DC) {
1618 GlobalDecl GD;
1619 // The Itanium spec says:
1620 // For entities in constructors and destructors, the mangling of the
1621 // complete object constructor or destructor is used as the base function
1622 // name, i.e. the C1 or D1 version.
1623 if (auto *CD = dyn_cast<CXXConstructorDecl>(DC))
1624 GD = GlobalDecl(CD, Ctor_Complete);
1625 else if (auto *DD = dyn_cast<CXXDestructorDecl>(DC))
1626 GD = GlobalDecl(DD, Dtor_Complete);
1627 else
1628 GD = GlobalDecl(cast<FunctionDecl>(DC));
1629 return GD;
1630 }
1631
mangleLocalName(GlobalDecl GD,const AbiTagList * AdditionalAbiTags)1632 void CXXNameMangler::mangleLocalName(GlobalDecl GD,
1633 const AbiTagList *AdditionalAbiTags) {
1634 const Decl *D = GD.getDecl();
1635 // <local-name> := Z <function encoding> E <entity name> [<discriminator>]
1636 // := Z <function encoding> E s [<discriminator>]
1637 // <local-name> := Z <function encoding> E d [ <parameter number> ]
1638 // _ <entity name>
1639 // <discriminator> := _ <non-negative number>
1640 assert(isa<NamedDecl>(D) || isa<BlockDecl>(D));
1641 const RecordDecl *RD = GetLocalClassDecl(D);
1642 const DeclContext *DC = getEffectiveDeclContext(RD ? RD : D);
1643
1644 Out << 'Z';
1645
1646 {
1647 AbiTagState LocalAbiTags(AbiTags);
1648
1649 if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(DC))
1650 mangleObjCMethodName(MD);
1651 else if (const BlockDecl *BD = dyn_cast<BlockDecl>(DC))
1652 mangleBlockForPrefix(BD);
1653 else
1654 mangleFunctionEncoding(getParentOfLocalEntity(DC));
1655
1656 // Implicit ABI tags (from namespace) are not available in the following
1657 // entity; reset to actually emitted tags, which are available.
1658 LocalAbiTags.setUsedAbiTags(LocalAbiTags.getEmittedAbiTags());
1659 }
1660
1661 Out << 'E';
1662
1663 // GCC 5.3.0 doesn't emit derived ABI tags for local names but that seems to
1664 // be a bug that is fixed in trunk.
1665
1666 if (RD) {
1667 // The parameter number is omitted for the last parameter, 0 for the
1668 // second-to-last parameter, 1 for the third-to-last parameter, etc. The
1669 // <entity name> will of course contain a <closure-type-name>: Its
1670 // numbering will be local to the particular argument in which it appears
1671 // -- other default arguments do not affect its encoding.
1672 const CXXRecordDecl *CXXRD = dyn_cast<CXXRecordDecl>(RD);
1673 if (CXXRD && CXXRD->isLambda()) {
1674 if (const ParmVarDecl *Parm
1675 = dyn_cast_or_null<ParmVarDecl>(CXXRD->getLambdaContextDecl())) {
1676 if (const FunctionDecl *Func
1677 = dyn_cast<FunctionDecl>(Parm->getDeclContext())) {
1678 Out << 'd';
1679 unsigned Num = Func->getNumParams() - Parm->getFunctionScopeIndex();
1680 if (Num > 1)
1681 mangleNumber(Num - 2);
1682 Out << '_';
1683 }
1684 }
1685 }
1686
1687 // Mangle the name relative to the closest enclosing function.
1688 // equality ok because RD derived from ND above
1689 if (D == RD) {
1690 mangleUnqualifiedName(RD, AdditionalAbiTags);
1691 } else if (const BlockDecl *BD = dyn_cast<BlockDecl>(D)) {
1692 manglePrefix(getEffectiveDeclContext(BD), true /*NoFunction*/);
1693 assert(!AdditionalAbiTags && "Block cannot have additional abi tags");
1694 mangleUnqualifiedBlock(BD);
1695 } else {
1696 const NamedDecl *ND = cast<NamedDecl>(D);
1697 mangleNestedName(GD, getEffectiveDeclContext(ND), AdditionalAbiTags,
1698 true /*NoFunction*/);
1699 }
1700 } else if (const BlockDecl *BD = dyn_cast<BlockDecl>(D)) {
1701 // Mangle a block in a default parameter; see above explanation for
1702 // lambdas.
1703 if (const ParmVarDecl *Parm
1704 = dyn_cast_or_null<ParmVarDecl>(BD->getBlockManglingContextDecl())) {
1705 if (const FunctionDecl *Func
1706 = dyn_cast<FunctionDecl>(Parm->getDeclContext())) {
1707 Out << 'd';
1708 unsigned Num = Func->getNumParams() - Parm->getFunctionScopeIndex();
1709 if (Num > 1)
1710 mangleNumber(Num - 2);
1711 Out << '_';
1712 }
1713 }
1714
1715 assert(!AdditionalAbiTags && "Block cannot have additional abi tags");
1716 mangleUnqualifiedBlock(BD);
1717 } else {
1718 mangleUnqualifiedName(GD, AdditionalAbiTags);
1719 }
1720
1721 if (const NamedDecl *ND = dyn_cast<NamedDecl>(RD ? RD : D)) {
1722 unsigned disc;
1723 if (Context.getNextDiscriminator(ND, disc)) {
1724 if (disc < 10)
1725 Out << '_' << disc;
1726 else
1727 Out << "__" << disc << '_';
1728 }
1729 }
1730 }
1731
mangleBlockForPrefix(const BlockDecl * Block)1732 void CXXNameMangler::mangleBlockForPrefix(const BlockDecl *Block) {
1733 if (GetLocalClassDecl(Block)) {
1734 mangleLocalName(Block, /* AdditionalAbiTags */ nullptr);
1735 return;
1736 }
1737 const DeclContext *DC = getEffectiveDeclContext(Block);
1738 if (isLocalContainerContext(DC)) {
1739 mangleLocalName(Block, /* AdditionalAbiTags */ nullptr);
1740 return;
1741 }
1742 manglePrefix(getEffectiveDeclContext(Block));
1743 mangleUnqualifiedBlock(Block);
1744 }
1745
mangleUnqualifiedBlock(const BlockDecl * Block)1746 void CXXNameMangler::mangleUnqualifiedBlock(const BlockDecl *Block) {
1747 if (Decl *Context = Block->getBlockManglingContextDecl()) {
1748 if ((isa<VarDecl>(Context) || isa<FieldDecl>(Context)) &&
1749 Context->getDeclContext()->isRecord()) {
1750 const auto *ND = cast<NamedDecl>(Context);
1751 if (ND->getIdentifier()) {
1752 mangleSourceNameWithAbiTags(ND);
1753 Out << 'M';
1754 }
1755 }
1756 }
1757
1758 // If we have a block mangling number, use it.
1759 unsigned Number = Block->getBlockManglingNumber();
1760 // Otherwise, just make up a number. It doesn't matter what it is because
1761 // the symbol in question isn't externally visible.
1762 if (!Number)
1763 Number = Context.getBlockId(Block, false);
1764 else {
1765 // Stored mangling numbers are 1-based.
1766 --Number;
1767 }
1768 Out << "Ub";
1769 if (Number > 0)
1770 Out << Number - 1;
1771 Out << '_';
1772 }
1773
1774 // <template-param-decl>
1775 // ::= Ty # template type parameter
1776 // ::= Tn <type> # template non-type parameter
1777 // ::= Tt <template-param-decl>* E # template template parameter
1778 // ::= Tp <template-param-decl> # template parameter pack
mangleTemplateParamDecl(const NamedDecl * Decl)1779 void CXXNameMangler::mangleTemplateParamDecl(const NamedDecl *Decl) {
1780 if (auto *Ty = dyn_cast<TemplateTypeParmDecl>(Decl)) {
1781 if (Ty->isParameterPack())
1782 Out << "Tp";
1783 Out << "Ty";
1784 } else if (auto *Tn = dyn_cast<NonTypeTemplateParmDecl>(Decl)) {
1785 if (Tn->isExpandedParameterPack()) {
1786 for (unsigned I = 0, N = Tn->getNumExpansionTypes(); I != N; ++I) {
1787 Out << "Tn";
1788 mangleType(Tn->getExpansionType(I));
1789 }
1790 } else {
1791 QualType T = Tn->getType();
1792 if (Tn->isParameterPack()) {
1793 Out << "Tp";
1794 if (auto *PackExpansion = T->getAs<PackExpansionType>())
1795 T = PackExpansion->getPattern();
1796 }
1797 Out << "Tn";
1798 mangleType(T);
1799 }
1800 } else if (auto *Tt = dyn_cast<TemplateTemplateParmDecl>(Decl)) {
1801 if (Tt->isExpandedParameterPack()) {
1802 for (unsigned I = 0, N = Tt->getNumExpansionTemplateParameters(); I != N;
1803 ++I) {
1804 Out << "Tt";
1805 for (auto *Param : *Tt->getExpansionTemplateParameters(I))
1806 mangleTemplateParamDecl(Param);
1807 Out << "E";
1808 }
1809 } else {
1810 if (Tt->isParameterPack())
1811 Out << "Tp";
1812 Out << "Tt";
1813 for (auto *Param : *Tt->getTemplateParameters())
1814 mangleTemplateParamDecl(Param);
1815 Out << "E";
1816 }
1817 }
1818 }
1819
mangleLambda(const CXXRecordDecl * Lambda)1820 void CXXNameMangler::mangleLambda(const CXXRecordDecl *Lambda) {
1821 // If the context of a closure type is an initializer for a class member
1822 // (static or nonstatic), it is encoded in a qualified name with a final
1823 // <prefix> of the form:
1824 //
1825 // <data-member-prefix> := <member source-name> M
1826 //
1827 // Technically, the data-member-prefix is part of the <prefix>. However,
1828 // since a closure type will always be mangled with a prefix, it's easier
1829 // to emit that last part of the prefix here.
1830 if (Decl *Context = Lambda->getLambdaContextDecl()) {
1831 if ((isa<VarDecl>(Context) || isa<FieldDecl>(Context)) &&
1832 !isa<ParmVarDecl>(Context)) {
1833 // FIXME: 'inline auto [a, b] = []{ return ... };' does not get a
1834 // reasonable mangling here.
1835 if (const IdentifierInfo *Name
1836 = cast<NamedDecl>(Context)->getIdentifier()) {
1837 mangleSourceName(Name);
1838 const TemplateArgumentList *TemplateArgs = nullptr;
1839 if (GlobalDecl TD = isTemplate(cast<NamedDecl>(Context), TemplateArgs))
1840 mangleTemplateArgs(asTemplateName(TD), *TemplateArgs);
1841 Out << 'M';
1842 }
1843 }
1844 }
1845
1846 Out << "Ul";
1847 mangleLambdaSig(Lambda);
1848 Out << "E";
1849
1850 // The number is omitted for the first closure type with a given
1851 // <lambda-sig> in a given context; it is n-2 for the nth closure type
1852 // (in lexical order) with that same <lambda-sig> and context.
1853 //
1854 // The AST keeps track of the number for us.
1855 //
1856 // In CUDA/HIP, to ensure the consistent lamba numbering between the device-
1857 // and host-side compilations, an extra device mangle context may be created
1858 // if the host-side CXX ABI has different numbering for lambda. In such case,
1859 // if the mangle context is that device-side one, use the device-side lambda
1860 // mangling number for this lambda.
1861 unsigned Number = Context.isDeviceMangleContext()
1862 ? Lambda->getDeviceLambdaManglingNumber()
1863 : Lambda->getLambdaManglingNumber();
1864 assert(Number > 0 && "Lambda should be mangled as an unnamed class");
1865 if (Number > 1)
1866 mangleNumber(Number - 2);
1867 Out << '_';
1868 }
1869
mangleLambdaSig(const CXXRecordDecl * Lambda)1870 void CXXNameMangler::mangleLambdaSig(const CXXRecordDecl *Lambda) {
1871 for (auto *D : Lambda->getLambdaExplicitTemplateParameters())
1872 mangleTemplateParamDecl(D);
1873 auto *Proto =
1874 Lambda->getLambdaTypeInfo()->getType()->castAs<FunctionProtoType>();
1875 mangleBareFunctionType(Proto, /*MangleReturnType=*/false,
1876 Lambda->getLambdaStaticInvoker());
1877 }
1878
manglePrefix(NestedNameSpecifier * qualifier)1879 void CXXNameMangler::manglePrefix(NestedNameSpecifier *qualifier) {
1880 switch (qualifier->getKind()) {
1881 case NestedNameSpecifier::Global:
1882 // nothing
1883 return;
1884
1885 case NestedNameSpecifier::Super:
1886 llvm_unreachable("Can't mangle __super specifier");
1887
1888 case NestedNameSpecifier::Namespace:
1889 mangleName(qualifier->getAsNamespace());
1890 return;
1891
1892 case NestedNameSpecifier::NamespaceAlias:
1893 mangleName(qualifier->getAsNamespaceAlias()->getNamespace());
1894 return;
1895
1896 case NestedNameSpecifier::TypeSpec:
1897 case NestedNameSpecifier::TypeSpecWithTemplate:
1898 manglePrefix(QualType(qualifier->getAsType(), 0));
1899 return;
1900
1901 case NestedNameSpecifier::Identifier:
1902 // Member expressions can have these without prefixes, but that
1903 // should end up in mangleUnresolvedPrefix instead.
1904 assert(qualifier->getPrefix());
1905 manglePrefix(qualifier->getPrefix());
1906
1907 mangleSourceName(qualifier->getAsIdentifier());
1908 return;
1909 }
1910
1911 llvm_unreachable("unexpected nested name specifier");
1912 }
1913
manglePrefix(const DeclContext * DC,bool NoFunction)1914 void CXXNameMangler::manglePrefix(const DeclContext *DC, bool NoFunction) {
1915 // <prefix> ::= <prefix> <unqualified-name>
1916 // ::= <template-prefix> <template-args>
1917 // ::= <template-param>
1918 // ::= # empty
1919 // ::= <substitution>
1920
1921 DC = IgnoreLinkageSpecDecls(DC);
1922
1923 if (DC->isTranslationUnit())
1924 return;
1925
1926 if (NoFunction && isLocalContainerContext(DC))
1927 return;
1928
1929 assert(!isLocalContainerContext(DC));
1930
1931 const NamedDecl *ND = cast<NamedDecl>(DC);
1932 if (mangleSubstitution(ND))
1933 return;
1934
1935 // Check if we have a template.
1936 const TemplateArgumentList *TemplateArgs = nullptr;
1937 if (GlobalDecl TD = isTemplate(ND, TemplateArgs)) {
1938 mangleTemplatePrefix(TD);
1939 mangleTemplateArgs(asTemplateName(TD), *TemplateArgs);
1940 } else {
1941 manglePrefix(getEffectiveDeclContext(ND), NoFunction);
1942 mangleUnqualifiedName(ND, nullptr);
1943 }
1944
1945 addSubstitution(ND);
1946 }
1947
mangleTemplatePrefix(TemplateName Template)1948 void CXXNameMangler::mangleTemplatePrefix(TemplateName Template) {
1949 // <template-prefix> ::= <prefix> <template unqualified-name>
1950 // ::= <template-param>
1951 // ::= <substitution>
1952 if (TemplateDecl *TD = Template.getAsTemplateDecl())
1953 return mangleTemplatePrefix(TD);
1954
1955 DependentTemplateName *Dependent = Template.getAsDependentTemplateName();
1956 assert(Dependent && "unexpected template name kind");
1957
1958 // Clang 11 and before mangled the substitution for a dependent template name
1959 // after already having emitted (a substitution for) the prefix.
1960 bool Clang11Compat = getASTContext().getLangOpts().getClangABICompat() <=
1961 LangOptions::ClangABI::Ver11;
1962 if (!Clang11Compat && mangleSubstitution(Template))
1963 return;
1964
1965 if (NestedNameSpecifier *Qualifier = Dependent->getQualifier())
1966 manglePrefix(Qualifier);
1967
1968 if (Clang11Compat && mangleSubstitution(Template))
1969 return;
1970
1971 if (const IdentifierInfo *Id = Dependent->getIdentifier())
1972 mangleSourceName(Id);
1973 else
1974 mangleOperatorName(Dependent->getOperator(), UnknownArity);
1975
1976 addSubstitution(Template);
1977 }
1978
mangleTemplatePrefix(GlobalDecl GD,bool NoFunction)1979 void CXXNameMangler::mangleTemplatePrefix(GlobalDecl GD,
1980 bool NoFunction) {
1981 const TemplateDecl *ND = cast<TemplateDecl>(GD.getDecl());
1982 // <template-prefix> ::= <prefix> <template unqualified-name>
1983 // ::= <template-param>
1984 // ::= <substitution>
1985 // <template-template-param> ::= <template-param>
1986 // <substitution>
1987
1988 if (mangleSubstitution(ND))
1989 return;
1990
1991 // <template-template-param> ::= <template-param>
1992 if (const auto *TTP = dyn_cast<TemplateTemplateParmDecl>(ND)) {
1993 mangleTemplateParameter(TTP->getDepth(), TTP->getIndex());
1994 } else {
1995 manglePrefix(getEffectiveDeclContext(ND), NoFunction);
1996 if (isa<BuiltinTemplateDecl>(ND) || isa<ConceptDecl>(ND))
1997 mangleUnqualifiedName(GD, nullptr);
1998 else
1999 mangleUnqualifiedName(GD.getWithDecl(ND->getTemplatedDecl()), nullptr);
2000 }
2001
2002 addSubstitution(ND);
2003 }
2004
2005 /// Mangles a template name under the production <type>. Required for
2006 /// template template arguments.
2007 /// <type> ::= <class-enum-type>
2008 /// ::= <template-param>
2009 /// ::= <substitution>
mangleType(TemplateName TN)2010 void CXXNameMangler::mangleType(TemplateName TN) {
2011 if (mangleSubstitution(TN))
2012 return;
2013
2014 TemplateDecl *TD = nullptr;
2015
2016 switch (TN.getKind()) {
2017 case TemplateName::QualifiedTemplate:
2018 TD = TN.getAsQualifiedTemplateName()->getTemplateDecl();
2019 goto HaveDecl;
2020
2021 case TemplateName::Template:
2022 TD = TN.getAsTemplateDecl();
2023 goto HaveDecl;
2024
2025 HaveDecl:
2026 if (auto *TTP = dyn_cast<TemplateTemplateParmDecl>(TD))
2027 mangleTemplateParameter(TTP->getDepth(), TTP->getIndex());
2028 else
2029 mangleName(TD);
2030 break;
2031
2032 case TemplateName::OverloadedTemplate:
2033 case TemplateName::AssumedTemplate:
2034 llvm_unreachable("can't mangle an overloaded template name as a <type>");
2035
2036 case TemplateName::DependentTemplate: {
2037 const DependentTemplateName *Dependent = TN.getAsDependentTemplateName();
2038 assert(Dependent->isIdentifier());
2039
2040 // <class-enum-type> ::= <name>
2041 // <name> ::= <nested-name>
2042 mangleUnresolvedPrefix(Dependent->getQualifier());
2043 mangleSourceName(Dependent->getIdentifier());
2044 break;
2045 }
2046
2047 case TemplateName::SubstTemplateTemplateParm: {
2048 // Substituted template parameters are mangled as the substituted
2049 // template. This will check for the substitution twice, which is
2050 // fine, but we have to return early so that we don't try to *add*
2051 // the substitution twice.
2052 SubstTemplateTemplateParmStorage *subst
2053 = TN.getAsSubstTemplateTemplateParm();
2054 mangleType(subst->getReplacement());
2055 return;
2056 }
2057
2058 case TemplateName::SubstTemplateTemplateParmPack: {
2059 // FIXME: not clear how to mangle this!
2060 // template <template <class> class T...> class A {
2061 // template <template <class> class U...> void foo(B<T,U> x...);
2062 // };
2063 Out << "_SUBSTPACK_";
2064 break;
2065 }
2066 }
2067
2068 addSubstitution(TN);
2069 }
2070
mangleUnresolvedTypeOrSimpleId(QualType Ty,StringRef Prefix)2071 bool CXXNameMangler::mangleUnresolvedTypeOrSimpleId(QualType Ty,
2072 StringRef Prefix) {
2073 // Only certain other types are valid as prefixes; enumerate them.
2074 switch (Ty->getTypeClass()) {
2075 case Type::Builtin:
2076 case Type::Complex:
2077 case Type::Adjusted:
2078 case Type::Decayed:
2079 case Type::Pointer:
2080 case Type::BlockPointer:
2081 case Type::LValueReference:
2082 case Type::RValueReference:
2083 case Type::MemberPointer:
2084 case Type::ConstantArray:
2085 case Type::IncompleteArray:
2086 case Type::VariableArray:
2087 case Type::DependentSizedArray:
2088 case Type::DependentAddressSpace:
2089 case Type::DependentVector:
2090 case Type::DependentSizedExtVector:
2091 case Type::Vector:
2092 case Type::ExtVector:
2093 case Type::ConstantMatrix:
2094 case Type::DependentSizedMatrix:
2095 case Type::FunctionProto:
2096 case Type::FunctionNoProto:
2097 case Type::Paren:
2098 case Type::Attributed:
2099 case Type::Auto:
2100 case Type::DeducedTemplateSpecialization:
2101 case Type::PackExpansion:
2102 case Type::ObjCObject:
2103 case Type::ObjCInterface:
2104 case Type::ObjCObjectPointer:
2105 case Type::ObjCTypeParam:
2106 case Type::Atomic:
2107 case Type::Pipe:
2108 case Type::MacroQualified:
2109 case Type::ExtInt:
2110 case Type::DependentExtInt:
2111 llvm_unreachable("type is illegal as a nested name specifier");
2112
2113 case Type::SubstTemplateTypeParmPack:
2114 // FIXME: not clear how to mangle this!
2115 // template <class T...> class A {
2116 // template <class U...> void foo(decltype(T::foo(U())) x...);
2117 // };
2118 Out << "_SUBSTPACK_";
2119 break;
2120
2121 // <unresolved-type> ::= <template-param>
2122 // ::= <decltype>
2123 // ::= <template-template-param> <template-args>
2124 // (this last is not official yet)
2125 case Type::TypeOfExpr:
2126 case Type::TypeOf:
2127 case Type::Decltype:
2128 case Type::TemplateTypeParm:
2129 case Type::UnaryTransform:
2130 case Type::SubstTemplateTypeParm:
2131 unresolvedType:
2132 // Some callers want a prefix before the mangled type.
2133 Out << Prefix;
2134
2135 // This seems to do everything we want. It's not really
2136 // sanctioned for a substituted template parameter, though.
2137 mangleType(Ty);
2138
2139 // We never want to print 'E' directly after an unresolved-type,
2140 // so we return directly.
2141 return true;
2142
2143 case Type::Typedef:
2144 mangleSourceNameWithAbiTags(cast<TypedefType>(Ty)->getDecl());
2145 break;
2146
2147 case Type::UnresolvedUsing:
2148 mangleSourceNameWithAbiTags(
2149 cast<UnresolvedUsingType>(Ty)->getDecl());
2150 break;
2151
2152 case Type::Enum:
2153 case Type::Record:
2154 mangleSourceNameWithAbiTags(cast<TagType>(Ty)->getDecl());
2155 break;
2156
2157 case Type::TemplateSpecialization: {
2158 const TemplateSpecializationType *TST =
2159 cast<TemplateSpecializationType>(Ty);
2160 TemplateName TN = TST->getTemplateName();
2161 switch (TN.getKind()) {
2162 case TemplateName::Template:
2163 case TemplateName::QualifiedTemplate: {
2164 TemplateDecl *TD = TN.getAsTemplateDecl();
2165
2166 // If the base is a template template parameter, this is an
2167 // unresolved type.
2168 assert(TD && "no template for template specialization type");
2169 if (isa<TemplateTemplateParmDecl>(TD))
2170 goto unresolvedType;
2171
2172 mangleSourceNameWithAbiTags(TD);
2173 break;
2174 }
2175
2176 case TemplateName::OverloadedTemplate:
2177 case TemplateName::AssumedTemplate:
2178 case TemplateName::DependentTemplate:
2179 llvm_unreachable("invalid base for a template specialization type");
2180
2181 case TemplateName::SubstTemplateTemplateParm: {
2182 SubstTemplateTemplateParmStorage *subst =
2183 TN.getAsSubstTemplateTemplateParm();
2184 mangleExistingSubstitution(subst->getReplacement());
2185 break;
2186 }
2187
2188 case TemplateName::SubstTemplateTemplateParmPack: {
2189 // FIXME: not clear how to mangle this!
2190 // template <template <class U> class T...> class A {
2191 // template <class U...> void foo(decltype(T<U>::foo) x...);
2192 // };
2193 Out << "_SUBSTPACK_";
2194 break;
2195 }
2196 }
2197
2198 // Note: we don't pass in the template name here. We are mangling the
2199 // original source-level template arguments, so we shouldn't consider
2200 // conversions to the corresponding template parameter.
2201 // FIXME: Other compilers mangle partially-resolved template arguments in
2202 // unresolved-qualifier-levels.
2203 mangleTemplateArgs(TemplateName(), TST->getArgs(), TST->getNumArgs());
2204 break;
2205 }
2206
2207 case Type::InjectedClassName:
2208 mangleSourceNameWithAbiTags(
2209 cast<InjectedClassNameType>(Ty)->getDecl());
2210 break;
2211
2212 case Type::DependentName:
2213 mangleSourceName(cast<DependentNameType>(Ty)->getIdentifier());
2214 break;
2215
2216 case Type::DependentTemplateSpecialization: {
2217 const DependentTemplateSpecializationType *DTST =
2218 cast<DependentTemplateSpecializationType>(Ty);
2219 TemplateName Template = getASTContext().getDependentTemplateName(
2220 DTST->getQualifier(), DTST->getIdentifier());
2221 mangleSourceName(DTST->getIdentifier());
2222 mangleTemplateArgs(Template, DTST->getArgs(), DTST->getNumArgs());
2223 break;
2224 }
2225
2226 case Type::Elaborated:
2227 return mangleUnresolvedTypeOrSimpleId(
2228 cast<ElaboratedType>(Ty)->getNamedType(), Prefix);
2229 }
2230
2231 return false;
2232 }
2233
mangleOperatorName(DeclarationName Name,unsigned Arity)2234 void CXXNameMangler::mangleOperatorName(DeclarationName Name, unsigned Arity) {
2235 switch (Name.getNameKind()) {
2236 case DeclarationName::CXXConstructorName:
2237 case DeclarationName::CXXDestructorName:
2238 case DeclarationName::CXXDeductionGuideName:
2239 case DeclarationName::CXXUsingDirective:
2240 case DeclarationName::Identifier:
2241 case DeclarationName::ObjCMultiArgSelector:
2242 case DeclarationName::ObjCOneArgSelector:
2243 case DeclarationName::ObjCZeroArgSelector:
2244 llvm_unreachable("Not an operator name");
2245
2246 case DeclarationName::CXXConversionFunctionName:
2247 // <operator-name> ::= cv <type> # (cast)
2248 Out << "cv";
2249 mangleType(Name.getCXXNameType());
2250 break;
2251
2252 case DeclarationName::CXXLiteralOperatorName:
2253 Out << "li";
2254 mangleSourceName(Name.getCXXLiteralIdentifier());
2255 return;
2256
2257 case DeclarationName::CXXOperatorName:
2258 mangleOperatorName(Name.getCXXOverloadedOperator(), Arity);
2259 break;
2260 }
2261 }
2262
2263 void
mangleOperatorName(OverloadedOperatorKind OO,unsigned Arity)2264 CXXNameMangler::mangleOperatorName(OverloadedOperatorKind OO, unsigned Arity) {
2265 switch (OO) {
2266 // <operator-name> ::= nw # new
2267 case OO_New: Out << "nw"; break;
2268 // ::= na # new[]
2269 case OO_Array_New: Out << "na"; break;
2270 // ::= dl # delete
2271 case OO_Delete: Out << "dl"; break;
2272 // ::= da # delete[]
2273 case OO_Array_Delete: Out << "da"; break;
2274 // ::= ps # + (unary)
2275 // ::= pl # + (binary or unknown)
2276 case OO_Plus:
2277 Out << (Arity == 1? "ps" : "pl"); break;
2278 // ::= ng # - (unary)
2279 // ::= mi # - (binary or unknown)
2280 case OO_Minus:
2281 Out << (Arity == 1? "ng" : "mi"); break;
2282 // ::= ad # & (unary)
2283 // ::= an # & (binary or unknown)
2284 case OO_Amp:
2285 Out << (Arity == 1? "ad" : "an"); break;
2286 // ::= de # * (unary)
2287 // ::= ml # * (binary or unknown)
2288 case OO_Star:
2289 // Use binary when unknown.
2290 Out << (Arity == 1? "de" : "ml"); break;
2291 // ::= co # ~
2292 case OO_Tilde: Out << "co"; break;
2293 // ::= dv # /
2294 case OO_Slash: Out << "dv"; break;
2295 // ::= rm # %
2296 case OO_Percent: Out << "rm"; break;
2297 // ::= or # |
2298 case OO_Pipe: Out << "or"; break;
2299 // ::= eo # ^
2300 case OO_Caret: Out << "eo"; break;
2301 // ::= aS # =
2302 case OO_Equal: Out << "aS"; break;
2303 // ::= pL # +=
2304 case OO_PlusEqual: Out << "pL"; break;
2305 // ::= mI # -=
2306 case OO_MinusEqual: Out << "mI"; break;
2307 // ::= mL # *=
2308 case OO_StarEqual: Out << "mL"; break;
2309 // ::= dV # /=
2310 case OO_SlashEqual: Out << "dV"; break;
2311 // ::= rM # %=
2312 case OO_PercentEqual: Out << "rM"; break;
2313 // ::= aN # &=
2314 case OO_AmpEqual: Out << "aN"; break;
2315 // ::= oR # |=
2316 case OO_PipeEqual: Out << "oR"; break;
2317 // ::= eO # ^=
2318 case OO_CaretEqual: Out << "eO"; break;
2319 // ::= ls # <<
2320 case OO_LessLess: Out << "ls"; break;
2321 // ::= rs # >>
2322 case OO_GreaterGreater: Out << "rs"; break;
2323 // ::= lS # <<=
2324 case OO_LessLessEqual: Out << "lS"; break;
2325 // ::= rS # >>=
2326 case OO_GreaterGreaterEqual: Out << "rS"; break;
2327 // ::= eq # ==
2328 case OO_EqualEqual: Out << "eq"; break;
2329 // ::= ne # !=
2330 case OO_ExclaimEqual: Out << "ne"; break;
2331 // ::= lt # <
2332 case OO_Less: Out << "lt"; break;
2333 // ::= gt # >
2334 case OO_Greater: Out << "gt"; break;
2335 // ::= le # <=
2336 case OO_LessEqual: Out << "le"; break;
2337 // ::= ge # >=
2338 case OO_GreaterEqual: Out << "ge"; break;
2339 // ::= nt # !
2340 case OO_Exclaim: Out << "nt"; break;
2341 // ::= aa # &&
2342 case OO_AmpAmp: Out << "aa"; break;
2343 // ::= oo # ||
2344 case OO_PipePipe: Out << "oo"; break;
2345 // ::= pp # ++
2346 case OO_PlusPlus: Out << "pp"; break;
2347 // ::= mm # --
2348 case OO_MinusMinus: Out << "mm"; break;
2349 // ::= cm # ,
2350 case OO_Comma: Out << "cm"; break;
2351 // ::= pm # ->*
2352 case OO_ArrowStar: Out << "pm"; break;
2353 // ::= pt # ->
2354 case OO_Arrow: Out << "pt"; break;
2355 // ::= cl # ()
2356 case OO_Call: Out << "cl"; break;
2357 // ::= ix # []
2358 case OO_Subscript: Out << "ix"; break;
2359
2360 // ::= qu # ?
2361 // The conditional operator can't be overloaded, but we still handle it when
2362 // mangling expressions.
2363 case OO_Conditional: Out << "qu"; break;
2364 // Proposal on cxx-abi-dev, 2015-10-21.
2365 // ::= aw # co_await
2366 case OO_Coawait: Out << "aw"; break;
2367 // Proposed in cxx-abi github issue 43.
2368 // ::= ss # <=>
2369 case OO_Spaceship: Out << "ss"; break;
2370
2371 case OO_None:
2372 case NUM_OVERLOADED_OPERATORS:
2373 llvm_unreachable("Not an overloaded operator");
2374 }
2375 }
2376
mangleQualifiers(Qualifiers Quals,const DependentAddressSpaceType * DAST)2377 void CXXNameMangler::mangleQualifiers(Qualifiers Quals, const DependentAddressSpaceType *DAST) {
2378 // Vendor qualifiers come first and if they are order-insensitive they must
2379 // be emitted in reversed alphabetical order, see Itanium ABI 5.1.5.
2380
2381 // <type> ::= U <addrspace-expr>
2382 if (DAST) {
2383 Out << "U2ASI";
2384 mangleExpression(DAST->getAddrSpaceExpr());
2385 Out << "E";
2386 }
2387
2388 // Address space qualifiers start with an ordinary letter.
2389 if (Quals.hasAddressSpace()) {
2390 // Address space extension:
2391 //
2392 // <type> ::= U <target-addrspace>
2393 // <type> ::= U <OpenCL-addrspace>
2394 // <type> ::= U <CUDA-addrspace>
2395
2396 SmallString<64> ASString;
2397 LangAS AS = Quals.getAddressSpace();
2398
2399 if (Context.getASTContext().addressSpaceMapManglingFor(AS)) {
2400 // <target-addrspace> ::= "AS" <address-space-number>
2401 unsigned TargetAS = Context.getASTContext().getTargetAddressSpace(AS);
2402 if (TargetAS != 0)
2403 ASString = "AS" + llvm::utostr(TargetAS);
2404 } else {
2405 switch (AS) {
2406 default: llvm_unreachable("Not a language specific address space");
2407 // <OpenCL-addrspace> ::= "CL" [ "global" | "local" | "constant" |
2408 // "private"| "generic" | "device" |
2409 // "host" ]
2410 case LangAS::opencl_global:
2411 ASString = "CLglobal";
2412 break;
2413 case LangAS::opencl_global_device:
2414 ASString = "CLdevice";
2415 break;
2416 case LangAS::opencl_global_host:
2417 ASString = "CLhost";
2418 break;
2419 case LangAS::opencl_local:
2420 ASString = "CLlocal";
2421 break;
2422 case LangAS::opencl_constant:
2423 ASString = "CLconstant";
2424 break;
2425 case LangAS::opencl_private:
2426 ASString = "CLprivate";
2427 break;
2428 case LangAS::opencl_generic:
2429 ASString = "CLgeneric";
2430 break;
2431 // <CUDA-addrspace> ::= "CU" [ "device" | "constant" | "shared" ]
2432 case LangAS::cuda_device:
2433 ASString = "CUdevice";
2434 break;
2435 case LangAS::cuda_constant:
2436 ASString = "CUconstant";
2437 break;
2438 case LangAS::cuda_shared:
2439 ASString = "CUshared";
2440 break;
2441 // <ptrsize-addrspace> ::= [ "ptr32_sptr" | "ptr32_uptr" | "ptr64" ]
2442 case LangAS::ptr32_sptr:
2443 ASString = "ptr32_sptr";
2444 break;
2445 case LangAS::ptr32_uptr:
2446 ASString = "ptr32_uptr";
2447 break;
2448 case LangAS::ptr64:
2449 ASString = "ptr64";
2450 break;
2451 }
2452 }
2453 if (!ASString.empty())
2454 mangleVendorQualifier(ASString);
2455 }
2456
2457 // The ARC ownership qualifiers start with underscores.
2458 // Objective-C ARC Extension:
2459 //
2460 // <type> ::= U "__strong"
2461 // <type> ::= U "__weak"
2462 // <type> ::= U "__autoreleasing"
2463 //
2464 // Note: we emit __weak first to preserve the order as
2465 // required by the Itanium ABI.
2466 if (Quals.getObjCLifetime() == Qualifiers::OCL_Weak)
2467 mangleVendorQualifier("__weak");
2468
2469 // __unaligned (from -fms-extensions)
2470 if (Quals.hasUnaligned())
2471 mangleVendorQualifier("__unaligned");
2472
2473 // Remaining ARC ownership qualifiers.
2474 switch (Quals.getObjCLifetime()) {
2475 case Qualifiers::OCL_None:
2476 break;
2477
2478 case Qualifiers::OCL_Weak:
2479 // Do nothing as we already handled this case above.
2480 break;
2481
2482 case Qualifiers::OCL_Strong:
2483 mangleVendorQualifier("__strong");
2484 break;
2485
2486 case Qualifiers::OCL_Autoreleasing:
2487 mangleVendorQualifier("__autoreleasing");
2488 break;
2489
2490 case Qualifiers::OCL_ExplicitNone:
2491 // The __unsafe_unretained qualifier is *not* mangled, so that
2492 // __unsafe_unretained types in ARC produce the same manglings as the
2493 // equivalent (but, naturally, unqualified) types in non-ARC, providing
2494 // better ABI compatibility.
2495 //
2496 // It's safe to do this because unqualified 'id' won't show up
2497 // in any type signatures that need to be mangled.
2498 break;
2499 }
2500
2501 // <CV-qualifiers> ::= [r] [V] [K] # restrict (C99), volatile, const
2502 if (Quals.hasRestrict())
2503 Out << 'r';
2504 if (Quals.hasVolatile())
2505 Out << 'V';
2506 if (Quals.hasConst())
2507 Out << 'K';
2508 }
2509
mangleVendorQualifier(StringRef name)2510 void CXXNameMangler::mangleVendorQualifier(StringRef name) {
2511 Out << 'U' << name.size() << name;
2512 }
2513
mangleRefQualifier(RefQualifierKind RefQualifier)2514 void CXXNameMangler::mangleRefQualifier(RefQualifierKind RefQualifier) {
2515 // <ref-qualifier> ::= R # lvalue reference
2516 // ::= O # rvalue-reference
2517 switch (RefQualifier) {
2518 case RQ_None:
2519 break;
2520
2521 case RQ_LValue:
2522 Out << 'R';
2523 break;
2524
2525 case RQ_RValue:
2526 Out << 'O';
2527 break;
2528 }
2529 }
2530
mangleObjCMethodName(const ObjCMethodDecl * MD)2531 void CXXNameMangler::mangleObjCMethodName(const ObjCMethodDecl *MD) {
2532 Context.mangleObjCMethodNameAsSourceName(MD, Out);
2533 }
2534
isTypeSubstitutable(Qualifiers Quals,const Type * Ty,ASTContext & Ctx)2535 static bool isTypeSubstitutable(Qualifiers Quals, const Type *Ty,
2536 ASTContext &Ctx) {
2537 if (Quals)
2538 return true;
2539 if (Ty->isSpecificBuiltinType(BuiltinType::ObjCSel))
2540 return true;
2541 if (Ty->isOpenCLSpecificType())
2542 return true;
2543 if (Ty->isBuiltinType())
2544 return false;
2545 // Through to Clang 6.0, we accidentally treated undeduced auto types as
2546 // substitution candidates.
2547 if (Ctx.getLangOpts().getClangABICompat() > LangOptions::ClangABI::Ver6 &&
2548 isa<AutoType>(Ty))
2549 return false;
2550 // A placeholder type for class template deduction is substitutable with
2551 // its corresponding template name; this is handled specially when mangling
2552 // the type.
2553 if (auto *DeducedTST = Ty->getAs<DeducedTemplateSpecializationType>())
2554 if (DeducedTST->getDeducedType().isNull())
2555 return false;
2556 return true;
2557 }
2558
mangleType(QualType T)2559 void CXXNameMangler::mangleType(QualType T) {
2560 // If our type is instantiation-dependent but not dependent, we mangle
2561 // it as it was written in the source, removing any top-level sugar.
2562 // Otherwise, use the canonical type.
2563 //
2564 // FIXME: This is an approximation of the instantiation-dependent name
2565 // mangling rules, since we should really be using the type as written and
2566 // augmented via semantic analysis (i.e., with implicit conversions and
2567 // default template arguments) for any instantiation-dependent type.
2568 // Unfortunately, that requires several changes to our AST:
2569 // - Instantiation-dependent TemplateSpecializationTypes will need to be
2570 // uniqued, so that we can handle substitutions properly
2571 // - Default template arguments will need to be represented in the
2572 // TemplateSpecializationType, since they need to be mangled even though
2573 // they aren't written.
2574 // - Conversions on non-type template arguments need to be expressed, since
2575 // they can affect the mangling of sizeof/alignof.
2576 //
2577 // FIXME: This is wrong when mapping to the canonical type for a dependent
2578 // type discards instantiation-dependent portions of the type, such as for:
2579 //
2580 // template<typename T, int N> void f(T (&)[sizeof(N)]);
2581 // template<typename T> void f(T() throw(typename T::type)); (pre-C++17)
2582 //
2583 // It's also wrong in the opposite direction when instantiation-dependent,
2584 // canonically-equivalent types differ in some irrelevant portion of inner
2585 // type sugar. In such cases, we fail to form correct substitutions, eg:
2586 //
2587 // template<int N> void f(A<sizeof(N)> *, A<sizeof(N)> (*));
2588 //
2589 // We should instead canonicalize the non-instantiation-dependent parts,
2590 // regardless of whether the type as a whole is dependent or instantiation
2591 // dependent.
2592 if (!T->isInstantiationDependentType() || T->isDependentType())
2593 T = T.getCanonicalType();
2594 else {
2595 // Desugar any types that are purely sugar.
2596 do {
2597 // Don't desugar through template specialization types that aren't
2598 // type aliases. We need to mangle the template arguments as written.
2599 if (const TemplateSpecializationType *TST
2600 = dyn_cast<TemplateSpecializationType>(T))
2601 if (!TST->isTypeAlias())
2602 break;
2603
2604 // FIXME: We presumably shouldn't strip off ElaboratedTypes with
2605 // instantation-dependent qualifiers. See
2606 // https://github.com/itanium-cxx-abi/cxx-abi/issues/114.
2607
2608 QualType Desugared
2609 = T.getSingleStepDesugaredType(Context.getASTContext());
2610 if (Desugared == T)
2611 break;
2612
2613 T = Desugared;
2614 } while (true);
2615 }
2616 SplitQualType split = T.split();
2617 Qualifiers quals = split.Quals;
2618 const Type *ty = split.Ty;
2619
2620 bool isSubstitutable =
2621 isTypeSubstitutable(quals, ty, Context.getASTContext());
2622 if (isSubstitutable && mangleSubstitution(T))
2623 return;
2624
2625 // If we're mangling a qualified array type, push the qualifiers to
2626 // the element type.
2627 if (quals && isa<ArrayType>(T)) {
2628 ty = Context.getASTContext().getAsArrayType(T);
2629 quals = Qualifiers();
2630
2631 // Note that we don't update T: we want to add the
2632 // substitution at the original type.
2633 }
2634
2635 if (quals || ty->isDependentAddressSpaceType()) {
2636 if (const DependentAddressSpaceType *DAST =
2637 dyn_cast<DependentAddressSpaceType>(ty)) {
2638 SplitQualType splitDAST = DAST->getPointeeType().split();
2639 mangleQualifiers(splitDAST.Quals, DAST);
2640 mangleType(QualType(splitDAST.Ty, 0));
2641 } else {
2642 mangleQualifiers(quals);
2643
2644 // Recurse: even if the qualified type isn't yet substitutable,
2645 // the unqualified type might be.
2646 mangleType(QualType(ty, 0));
2647 }
2648 } else {
2649 switch (ty->getTypeClass()) {
2650 #define ABSTRACT_TYPE(CLASS, PARENT)
2651 #define NON_CANONICAL_TYPE(CLASS, PARENT) \
2652 case Type::CLASS: \
2653 llvm_unreachable("can't mangle non-canonical type " #CLASS "Type"); \
2654 return;
2655 #define TYPE(CLASS, PARENT) \
2656 case Type::CLASS: \
2657 mangleType(static_cast<const CLASS##Type*>(ty)); \
2658 break;
2659 #include "clang/AST/TypeNodes.inc"
2660 }
2661 }
2662
2663 // Add the substitution.
2664 if (isSubstitutable)
2665 addSubstitution(T);
2666 }
2667
mangleNameOrStandardSubstitution(const NamedDecl * ND)2668 void CXXNameMangler::mangleNameOrStandardSubstitution(const NamedDecl *ND) {
2669 if (!mangleStandardSubstitution(ND))
2670 mangleName(ND);
2671 }
2672
mangleType(const BuiltinType * T)2673 void CXXNameMangler::mangleType(const BuiltinType *T) {
2674 // <type> ::= <builtin-type>
2675 // <builtin-type> ::= v # void
2676 // ::= w # wchar_t
2677 // ::= b # bool
2678 // ::= c # char
2679 // ::= a # signed char
2680 // ::= h # unsigned char
2681 // ::= s # short
2682 // ::= t # unsigned short
2683 // ::= i # int
2684 // ::= j # unsigned int
2685 // ::= l # long
2686 // ::= m # unsigned long
2687 // ::= x # long long, __int64
2688 // ::= y # unsigned long long, __int64
2689 // ::= n # __int128
2690 // ::= o # unsigned __int128
2691 // ::= f # float
2692 // ::= d # double
2693 // ::= e # long double, __float80
2694 // ::= g # __float128
2695 // UNSUPPORTED: ::= Dd # IEEE 754r decimal floating point (64 bits)
2696 // UNSUPPORTED: ::= De # IEEE 754r decimal floating point (128 bits)
2697 // UNSUPPORTED: ::= Df # IEEE 754r decimal floating point (32 bits)
2698 // ::= Dh # IEEE 754r half-precision floating point (16 bits)
2699 // ::= DF <number> _ # ISO/IEC TS 18661 binary floating point type _FloatN (N bits);
2700 // ::= Di # char32_t
2701 // ::= Ds # char16_t
2702 // ::= Dn # std::nullptr_t (i.e., decltype(nullptr))
2703 // ::= u <source-name> # vendor extended type
2704 std::string type_name;
2705 switch (T->getKind()) {
2706 case BuiltinType::Void:
2707 Out << 'v';
2708 break;
2709 case BuiltinType::Bool:
2710 Out << 'b';
2711 break;
2712 case BuiltinType::Char_U:
2713 case BuiltinType::Char_S:
2714 Out << 'c';
2715 break;
2716 case BuiltinType::UChar:
2717 Out << 'h';
2718 break;
2719 case BuiltinType::UShort:
2720 Out << 't';
2721 break;
2722 case BuiltinType::UInt:
2723 Out << 'j';
2724 break;
2725 case BuiltinType::ULong:
2726 Out << 'm';
2727 break;
2728 case BuiltinType::ULongLong:
2729 Out << 'y';
2730 break;
2731 case BuiltinType::UInt128:
2732 Out << 'o';
2733 break;
2734 case BuiltinType::SChar:
2735 Out << 'a';
2736 break;
2737 case BuiltinType::WChar_S:
2738 case BuiltinType::WChar_U:
2739 Out << 'w';
2740 break;
2741 case BuiltinType::Char8:
2742 Out << "Du";
2743 break;
2744 case BuiltinType::Char16:
2745 Out << "Ds";
2746 break;
2747 case BuiltinType::Char32:
2748 Out << "Di";
2749 break;
2750 case BuiltinType::Short:
2751 Out << 's';
2752 break;
2753 case BuiltinType::Int:
2754 Out << 'i';
2755 break;
2756 case BuiltinType::Long:
2757 Out << 'l';
2758 break;
2759 case BuiltinType::LongLong:
2760 Out << 'x';
2761 break;
2762 case BuiltinType::Int128:
2763 Out << 'n';
2764 break;
2765 case BuiltinType::Float16:
2766 Out << "DF16_";
2767 break;
2768 case BuiltinType::ShortAccum:
2769 case BuiltinType::Accum:
2770 case BuiltinType::LongAccum:
2771 case BuiltinType::UShortAccum:
2772 case BuiltinType::UAccum:
2773 case BuiltinType::ULongAccum:
2774 case BuiltinType::ShortFract:
2775 case BuiltinType::Fract:
2776 case BuiltinType::LongFract:
2777 case BuiltinType::UShortFract:
2778 case BuiltinType::UFract:
2779 case BuiltinType::ULongFract:
2780 case BuiltinType::SatShortAccum:
2781 case BuiltinType::SatAccum:
2782 case BuiltinType::SatLongAccum:
2783 case BuiltinType::SatUShortAccum:
2784 case BuiltinType::SatUAccum:
2785 case BuiltinType::SatULongAccum:
2786 case BuiltinType::SatShortFract:
2787 case BuiltinType::SatFract:
2788 case BuiltinType::SatLongFract:
2789 case BuiltinType::SatUShortFract:
2790 case BuiltinType::SatUFract:
2791 case BuiltinType::SatULongFract:
2792 llvm_unreachable("Fixed point types are disabled for c++");
2793 case BuiltinType::Half:
2794 Out << "Dh";
2795 break;
2796 case BuiltinType::Float:
2797 Out << 'f';
2798 break;
2799 case BuiltinType::Double:
2800 Out << 'd';
2801 break;
2802 case BuiltinType::LongDouble: {
2803 const TargetInfo *TI = getASTContext().getLangOpts().OpenMP &&
2804 getASTContext().getLangOpts().OpenMPIsDevice
2805 ? getASTContext().getAuxTargetInfo()
2806 : &getASTContext().getTargetInfo();
2807 Out << TI->getLongDoubleMangling();
2808 break;
2809 }
2810 case BuiltinType::Float128: {
2811 const TargetInfo *TI = getASTContext().getLangOpts().OpenMP &&
2812 getASTContext().getLangOpts().OpenMPIsDevice
2813 ? getASTContext().getAuxTargetInfo()
2814 : &getASTContext().getTargetInfo();
2815 Out << TI->getFloat128Mangling();
2816 break;
2817 }
2818 case BuiltinType::BFloat16: {
2819 const TargetInfo *TI = &getASTContext().getTargetInfo();
2820 Out << TI->getBFloat16Mangling();
2821 break;
2822 }
2823 case BuiltinType::NullPtr:
2824 Out << "Dn";
2825 break;
2826
2827 #define BUILTIN_TYPE(Id, SingletonId)
2828 #define PLACEHOLDER_TYPE(Id, SingletonId) \
2829 case BuiltinType::Id:
2830 #include "clang/AST/BuiltinTypes.def"
2831 case BuiltinType::Dependent:
2832 if (!NullOut)
2833 llvm_unreachable("mangling a placeholder type");
2834 break;
2835 case BuiltinType::ObjCId:
2836 Out << "11objc_object";
2837 break;
2838 case BuiltinType::ObjCClass:
2839 Out << "10objc_class";
2840 break;
2841 case BuiltinType::ObjCSel:
2842 Out << "13objc_selector";
2843 break;
2844 #define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \
2845 case BuiltinType::Id: \
2846 type_name = "ocl_" #ImgType "_" #Suffix; \
2847 Out << type_name.size() << type_name; \
2848 break;
2849 #include "clang/Basic/OpenCLImageTypes.def"
2850 case BuiltinType::OCLSampler:
2851 Out << "11ocl_sampler";
2852 break;
2853 case BuiltinType::OCLEvent:
2854 Out << "9ocl_event";
2855 break;
2856 case BuiltinType::OCLClkEvent:
2857 Out << "12ocl_clkevent";
2858 break;
2859 case BuiltinType::OCLQueue:
2860 Out << "9ocl_queue";
2861 break;
2862 case BuiltinType::OCLReserveID:
2863 Out << "13ocl_reserveid";
2864 break;
2865 #define EXT_OPAQUE_TYPE(ExtType, Id, Ext) \
2866 case BuiltinType::Id: \
2867 type_name = "ocl_" #ExtType; \
2868 Out << type_name.size() << type_name; \
2869 break;
2870 #include "clang/Basic/OpenCLExtensionTypes.def"
2871 // The SVE types are effectively target-specific. The mangling scheme
2872 // is defined in the appendices to the Procedure Call Standard for the
2873 // Arm Architecture.
2874 #define SVE_VECTOR_TYPE(InternalName, MangledName, Id, SingletonId, NumEls, \
2875 ElBits, IsSigned, IsFP, IsBF) \
2876 case BuiltinType::Id: \
2877 type_name = MangledName; \
2878 Out << (type_name == InternalName ? "u" : "") << type_name.size() \
2879 << type_name; \
2880 break;
2881 #define SVE_PREDICATE_TYPE(InternalName, MangledName, Id, SingletonId, NumEls) \
2882 case BuiltinType::Id: \
2883 type_name = MangledName; \
2884 Out << (type_name == InternalName ? "u" : "") << type_name.size() \
2885 << type_name; \
2886 break;
2887 #include "clang/Basic/AArch64SVEACLETypes.def"
2888 #define PPC_VECTOR_TYPE(Name, Id, Size) \
2889 case BuiltinType::Id: \
2890 type_name = #Name; \
2891 Out << 'u' << type_name.size() << type_name; \
2892 break;
2893 #include "clang/Basic/PPCTypes.def"
2894 }
2895 }
2896
getCallingConvQualifierName(CallingConv CC)2897 StringRef CXXNameMangler::getCallingConvQualifierName(CallingConv CC) {
2898 switch (CC) {
2899 case CC_C:
2900 return "";
2901
2902 case CC_X86VectorCall:
2903 case CC_X86Pascal:
2904 case CC_X86RegCall:
2905 case CC_AAPCS:
2906 case CC_AAPCS_VFP:
2907 case CC_AArch64VectorCall:
2908 case CC_IntelOclBicc:
2909 case CC_SpirFunction:
2910 case CC_OpenCLKernel:
2911 case CC_PreserveMost:
2912 case CC_PreserveAll:
2913 // FIXME: we should be mangling all of the above.
2914 return "";
2915
2916 case CC_X86ThisCall:
2917 // FIXME: To match mingw GCC, thiscall should only be mangled in when it is
2918 // used explicitly. At this point, we don't have that much information in
2919 // the AST, since clang tends to bake the convention into the canonical
2920 // function type. thiscall only rarely used explicitly, so don't mangle it
2921 // for now.
2922 return "";
2923
2924 case CC_X86StdCall:
2925 return "stdcall";
2926 case CC_X86FastCall:
2927 return "fastcall";
2928 case CC_X86_64SysV:
2929 return "sysv_abi";
2930 case CC_Win64:
2931 return "ms_abi";
2932 case CC_Swift:
2933 return "swiftcall";
2934 }
2935 llvm_unreachable("bad calling convention");
2936 }
2937
mangleExtFunctionInfo(const FunctionType * T)2938 void CXXNameMangler::mangleExtFunctionInfo(const FunctionType *T) {
2939 // Fast path.
2940 if (T->getExtInfo() == FunctionType::ExtInfo())
2941 return;
2942
2943 // Vendor-specific qualifiers are emitted in reverse alphabetical order.
2944 // This will get more complicated in the future if we mangle other
2945 // things here; but for now, since we mangle ns_returns_retained as
2946 // a qualifier on the result type, we can get away with this:
2947 StringRef CCQualifier = getCallingConvQualifierName(T->getExtInfo().getCC());
2948 if (!CCQualifier.empty())
2949 mangleVendorQualifier(CCQualifier);
2950
2951 // FIXME: regparm
2952 // FIXME: noreturn
2953 }
2954
2955 void
mangleExtParameterInfo(FunctionProtoType::ExtParameterInfo PI)2956 CXXNameMangler::mangleExtParameterInfo(FunctionProtoType::ExtParameterInfo PI) {
2957 // Vendor-specific qualifiers are emitted in reverse alphabetical order.
2958
2959 // Note that these are *not* substitution candidates. Demanglers might
2960 // have trouble with this if the parameter type is fully substituted.
2961
2962 switch (PI.getABI()) {
2963 case ParameterABI::Ordinary:
2964 break;
2965
2966 // All of these start with "swift", so they come before "ns_consumed".
2967 case ParameterABI::SwiftContext:
2968 case ParameterABI::SwiftErrorResult:
2969 case ParameterABI::SwiftIndirectResult:
2970 mangleVendorQualifier(getParameterABISpelling(PI.getABI()));
2971 break;
2972 }
2973
2974 if (PI.isConsumed())
2975 mangleVendorQualifier("ns_consumed");
2976
2977 if (PI.isNoEscape())
2978 mangleVendorQualifier("noescape");
2979 }
2980
2981 // <type> ::= <function-type>
2982 // <function-type> ::= [<CV-qualifiers>] F [Y]
2983 // <bare-function-type> [<ref-qualifier>] E
mangleType(const FunctionProtoType * T)2984 void CXXNameMangler::mangleType(const FunctionProtoType *T) {
2985 mangleExtFunctionInfo(T);
2986
2987 // Mangle CV-qualifiers, if present. These are 'this' qualifiers,
2988 // e.g. "const" in "int (A::*)() const".
2989 mangleQualifiers(T->getMethodQuals());
2990
2991 // Mangle instantiation-dependent exception-specification, if present,
2992 // per cxx-abi-dev proposal on 2016-10-11.
2993 if (T->hasInstantiationDependentExceptionSpec()) {
2994 if (isComputedNoexcept(T->getExceptionSpecType())) {
2995 Out << "DO";
2996 mangleExpression(T->getNoexceptExpr());
2997 Out << "E";
2998 } else {
2999 assert(T->getExceptionSpecType() == EST_Dynamic);
3000 Out << "Dw";
3001 for (auto ExceptTy : T->exceptions())
3002 mangleType(ExceptTy);
3003 Out << "E";
3004 }
3005 } else if (T->isNothrow()) {
3006 Out << "Do";
3007 }
3008
3009 Out << 'F';
3010
3011 // FIXME: We don't have enough information in the AST to produce the 'Y'
3012 // encoding for extern "C" function types.
3013 mangleBareFunctionType(T, /*MangleReturnType=*/true);
3014
3015 // Mangle the ref-qualifier, if present.
3016 mangleRefQualifier(T->getRefQualifier());
3017
3018 Out << 'E';
3019 }
3020
mangleType(const FunctionNoProtoType * T)3021 void CXXNameMangler::mangleType(const FunctionNoProtoType *T) {
3022 // Function types without prototypes can arise when mangling a function type
3023 // within an overloadable function in C. We mangle these as the absence of any
3024 // parameter types (not even an empty parameter list).
3025 Out << 'F';
3026
3027 FunctionTypeDepthState saved = FunctionTypeDepth.push();
3028
3029 FunctionTypeDepth.enterResultType();
3030 mangleType(T->getReturnType());
3031 FunctionTypeDepth.leaveResultType();
3032
3033 FunctionTypeDepth.pop(saved);
3034 Out << 'E';
3035 }
3036
mangleBareFunctionType(const FunctionProtoType * Proto,bool MangleReturnType,const FunctionDecl * FD)3037 void CXXNameMangler::mangleBareFunctionType(const FunctionProtoType *Proto,
3038 bool MangleReturnType,
3039 const FunctionDecl *FD) {
3040 // Record that we're in a function type. See mangleFunctionParam
3041 // for details on what we're trying to achieve here.
3042 FunctionTypeDepthState saved = FunctionTypeDepth.push();
3043
3044 // <bare-function-type> ::= <signature type>+
3045 if (MangleReturnType) {
3046 FunctionTypeDepth.enterResultType();
3047
3048 // Mangle ns_returns_retained as an order-sensitive qualifier here.
3049 if (Proto->getExtInfo().getProducesResult() && FD == nullptr)
3050 mangleVendorQualifier("ns_returns_retained");
3051
3052 // Mangle the return type without any direct ARC ownership qualifiers.
3053 QualType ReturnTy = Proto->getReturnType();
3054 if (ReturnTy.getObjCLifetime()) {
3055 auto SplitReturnTy = ReturnTy.split();
3056 SplitReturnTy.Quals.removeObjCLifetime();
3057 ReturnTy = getASTContext().getQualifiedType(SplitReturnTy);
3058 }
3059 mangleType(ReturnTy);
3060
3061 FunctionTypeDepth.leaveResultType();
3062 }
3063
3064 if (Proto->getNumParams() == 0 && !Proto->isVariadic()) {
3065 // <builtin-type> ::= v # void
3066 Out << 'v';
3067
3068 FunctionTypeDepth.pop(saved);
3069 return;
3070 }
3071
3072 assert(!FD || FD->getNumParams() == Proto->getNumParams());
3073 for (unsigned I = 0, E = Proto->getNumParams(); I != E; ++I) {
3074 // Mangle extended parameter info as order-sensitive qualifiers here.
3075 if (Proto->hasExtParameterInfos() && FD == nullptr) {
3076 mangleExtParameterInfo(Proto->getExtParameterInfo(I));
3077 }
3078
3079 // Mangle the type.
3080 QualType ParamTy = Proto->getParamType(I);
3081 mangleType(Context.getASTContext().getSignatureParameterType(ParamTy));
3082
3083 if (FD) {
3084 if (auto *Attr = FD->getParamDecl(I)->getAttr<PassObjectSizeAttr>()) {
3085 // Attr can only take 1 character, so we can hardcode the length below.
3086 assert(Attr->getType() <= 9 && Attr->getType() >= 0);
3087 if (Attr->isDynamic())
3088 Out << "U25pass_dynamic_object_size" << Attr->getType();
3089 else
3090 Out << "U17pass_object_size" << Attr->getType();
3091 }
3092 }
3093 }
3094
3095 FunctionTypeDepth.pop(saved);
3096
3097 // <builtin-type> ::= z # ellipsis
3098 if (Proto->isVariadic())
3099 Out << 'z';
3100 }
3101
3102 // <type> ::= <class-enum-type>
3103 // <class-enum-type> ::= <name>
mangleType(const UnresolvedUsingType * T)3104 void CXXNameMangler::mangleType(const UnresolvedUsingType *T) {
3105 mangleName(T->getDecl());
3106 }
3107
3108 // <type> ::= <class-enum-type>
3109 // <class-enum-type> ::= <name>
mangleType(const EnumType * T)3110 void CXXNameMangler::mangleType(const EnumType *T) {
3111 mangleType(static_cast<const TagType*>(T));
3112 }
mangleType(const RecordType * T)3113 void CXXNameMangler::mangleType(const RecordType *T) {
3114 mangleType(static_cast<const TagType*>(T));
3115 }
mangleType(const TagType * T)3116 void CXXNameMangler::mangleType(const TagType *T) {
3117 mangleName(T->getDecl());
3118 }
3119
3120 // <type> ::= <array-type>
3121 // <array-type> ::= A <positive dimension number> _ <element type>
3122 // ::= A [<dimension expression>] _ <element type>
mangleType(const ConstantArrayType * T)3123 void CXXNameMangler::mangleType(const ConstantArrayType *T) {
3124 Out << 'A' << T->getSize() << '_';
3125 mangleType(T->getElementType());
3126 }
mangleType(const VariableArrayType * T)3127 void CXXNameMangler::mangleType(const VariableArrayType *T) {
3128 Out << 'A';
3129 // decayed vla types (size 0) will just be skipped.
3130 if (T->getSizeExpr())
3131 mangleExpression(T->getSizeExpr());
3132 Out << '_';
3133 mangleType(T->getElementType());
3134 }
mangleType(const DependentSizedArrayType * T)3135 void CXXNameMangler::mangleType(const DependentSizedArrayType *T) {
3136 Out << 'A';
3137 mangleExpression(T->getSizeExpr());
3138 Out << '_';
3139 mangleType(T->getElementType());
3140 }
mangleType(const IncompleteArrayType * T)3141 void CXXNameMangler::mangleType(const IncompleteArrayType *T) {
3142 Out << "A_";
3143 mangleType(T->getElementType());
3144 }
3145
3146 // <type> ::= <pointer-to-member-type>
3147 // <pointer-to-member-type> ::= M <class type> <member type>
mangleType(const MemberPointerType * T)3148 void CXXNameMangler::mangleType(const MemberPointerType *T) {
3149 Out << 'M';
3150 mangleType(QualType(T->getClass(), 0));
3151 QualType PointeeType = T->getPointeeType();
3152 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(PointeeType)) {
3153 mangleType(FPT);
3154
3155 // Itanium C++ ABI 5.1.8:
3156 //
3157 // The type of a non-static member function is considered to be different,
3158 // for the purposes of substitution, from the type of a namespace-scope or
3159 // static member function whose type appears similar. The types of two
3160 // non-static member functions are considered to be different, for the
3161 // purposes of substitution, if the functions are members of different
3162 // classes. In other words, for the purposes of substitution, the class of
3163 // which the function is a member is considered part of the type of
3164 // function.
3165
3166 // Given that we already substitute member function pointers as a
3167 // whole, the net effect of this rule is just to unconditionally
3168 // suppress substitution on the function type in a member pointer.
3169 // We increment the SeqID here to emulate adding an entry to the
3170 // substitution table.
3171 ++SeqID;
3172 } else
3173 mangleType(PointeeType);
3174 }
3175
3176 // <type> ::= <template-param>
mangleType(const TemplateTypeParmType * T)3177 void CXXNameMangler::mangleType(const TemplateTypeParmType *T) {
3178 mangleTemplateParameter(T->getDepth(), T->getIndex());
3179 }
3180
3181 // <type> ::= <template-param>
mangleType(const SubstTemplateTypeParmPackType * T)3182 void CXXNameMangler::mangleType(const SubstTemplateTypeParmPackType *T) {
3183 // FIXME: not clear how to mangle this!
3184 // template <class T...> class A {
3185 // template <class U...> void foo(T(*)(U) x...);
3186 // };
3187 Out << "_SUBSTPACK_";
3188 }
3189
3190 // <type> ::= P <type> # pointer-to
mangleType(const PointerType * T)3191 void CXXNameMangler::mangleType(const PointerType *T) {
3192 Out << 'P';
3193 mangleType(T->getPointeeType());
3194 }
mangleType(const ObjCObjectPointerType * T)3195 void CXXNameMangler::mangleType(const ObjCObjectPointerType *T) {
3196 Out << 'P';
3197 mangleType(T->getPointeeType());
3198 }
3199
3200 // <type> ::= R <type> # reference-to
mangleType(const LValueReferenceType * T)3201 void CXXNameMangler::mangleType(const LValueReferenceType *T) {
3202 Out << 'R';
3203 mangleType(T->getPointeeType());
3204 }
3205
3206 // <type> ::= O <type> # rvalue reference-to (C++0x)
mangleType(const RValueReferenceType * T)3207 void CXXNameMangler::mangleType(const RValueReferenceType *T) {
3208 Out << 'O';
3209 mangleType(T->getPointeeType());
3210 }
3211
3212 // <type> ::= C <type> # complex pair (C 2000)
mangleType(const ComplexType * T)3213 void CXXNameMangler::mangleType(const ComplexType *T) {
3214 Out << 'C';
3215 mangleType(T->getElementType());
3216 }
3217
3218 // ARM's ABI for Neon vector types specifies that they should be mangled as
3219 // if they are structs (to match ARM's initial implementation). The
3220 // vector type must be one of the special types predefined by ARM.
mangleNeonVectorType(const VectorType * T)3221 void CXXNameMangler::mangleNeonVectorType(const VectorType *T) {
3222 QualType EltType = T->getElementType();
3223 assert(EltType->isBuiltinType() && "Neon vector element not a BuiltinType");
3224 const char *EltName = nullptr;
3225 if (T->getVectorKind() == VectorType::NeonPolyVector) {
3226 switch (cast<BuiltinType>(EltType)->getKind()) {
3227 case BuiltinType::SChar:
3228 case BuiltinType::UChar:
3229 EltName = "poly8_t";
3230 break;
3231 case BuiltinType::Short:
3232 case BuiltinType::UShort:
3233 EltName = "poly16_t";
3234 break;
3235 case BuiltinType::LongLong:
3236 case BuiltinType::ULongLong:
3237 EltName = "poly64_t";
3238 break;
3239 default: llvm_unreachable("unexpected Neon polynomial vector element type");
3240 }
3241 } else {
3242 switch (cast<BuiltinType>(EltType)->getKind()) {
3243 case BuiltinType::SChar: EltName = "int8_t"; break;
3244 case BuiltinType::UChar: EltName = "uint8_t"; break;
3245 case BuiltinType::Short: EltName = "int16_t"; break;
3246 case BuiltinType::UShort: EltName = "uint16_t"; break;
3247 case BuiltinType::Int: EltName = "int32_t"; break;
3248 case BuiltinType::UInt: EltName = "uint32_t"; break;
3249 case BuiltinType::LongLong: EltName = "int64_t"; break;
3250 case BuiltinType::ULongLong: EltName = "uint64_t"; break;
3251 case BuiltinType::Double: EltName = "float64_t"; break;
3252 case BuiltinType::Float: EltName = "float32_t"; break;
3253 case BuiltinType::Half: EltName = "float16_t"; break;
3254 case BuiltinType::BFloat16: EltName = "bfloat16_t"; break;
3255 default:
3256 llvm_unreachable("unexpected Neon vector element type");
3257 }
3258 }
3259 const char *BaseName = nullptr;
3260 unsigned BitSize = (T->getNumElements() *
3261 getASTContext().getTypeSize(EltType));
3262 if (BitSize == 64)
3263 BaseName = "__simd64_";
3264 else {
3265 assert(BitSize == 128 && "Neon vector type not 64 or 128 bits");
3266 BaseName = "__simd128_";
3267 }
3268 Out << strlen(BaseName) + strlen(EltName);
3269 Out << BaseName << EltName;
3270 }
3271
mangleNeonVectorType(const DependentVectorType * T)3272 void CXXNameMangler::mangleNeonVectorType(const DependentVectorType *T) {
3273 DiagnosticsEngine &Diags = Context.getDiags();
3274 unsigned DiagID = Diags.getCustomDiagID(
3275 DiagnosticsEngine::Error,
3276 "cannot mangle this dependent neon vector type yet");
3277 Diags.Report(T->getAttributeLoc(), DiagID);
3278 }
3279
mangleAArch64VectorBase(const BuiltinType * EltType)3280 static StringRef mangleAArch64VectorBase(const BuiltinType *EltType) {
3281 switch (EltType->getKind()) {
3282 case BuiltinType::SChar:
3283 return "Int8";
3284 case BuiltinType::Short:
3285 return "Int16";
3286 case BuiltinType::Int:
3287 return "Int32";
3288 case BuiltinType::Long:
3289 case BuiltinType::LongLong:
3290 return "Int64";
3291 case BuiltinType::UChar:
3292 return "Uint8";
3293 case BuiltinType::UShort:
3294 return "Uint16";
3295 case BuiltinType::UInt:
3296 return "Uint32";
3297 case BuiltinType::ULong:
3298 case BuiltinType::ULongLong:
3299 return "Uint64";
3300 case BuiltinType::Half:
3301 return "Float16";
3302 case BuiltinType::Float:
3303 return "Float32";
3304 case BuiltinType::Double:
3305 return "Float64";
3306 case BuiltinType::BFloat16:
3307 return "Bfloat16";
3308 default:
3309 llvm_unreachable("Unexpected vector element base type");
3310 }
3311 }
3312
3313 // AArch64's ABI for Neon vector types specifies that they should be mangled as
3314 // the equivalent internal name. The vector type must be one of the special
3315 // types predefined by ARM.
mangleAArch64NeonVectorType(const VectorType * T)3316 void CXXNameMangler::mangleAArch64NeonVectorType(const VectorType *T) {
3317 QualType EltType = T->getElementType();
3318 assert(EltType->isBuiltinType() && "Neon vector element not a BuiltinType");
3319 unsigned BitSize =
3320 (T->getNumElements() * getASTContext().getTypeSize(EltType));
3321 (void)BitSize; // Silence warning.
3322
3323 assert((BitSize == 64 || BitSize == 128) &&
3324 "Neon vector type not 64 or 128 bits");
3325
3326 StringRef EltName;
3327 if (T->getVectorKind() == VectorType::NeonPolyVector) {
3328 switch (cast<BuiltinType>(EltType)->getKind()) {
3329 case BuiltinType::UChar:
3330 EltName = "Poly8";
3331 break;
3332 case BuiltinType::UShort:
3333 EltName = "Poly16";
3334 break;
3335 case BuiltinType::ULong:
3336 case BuiltinType::ULongLong:
3337 EltName = "Poly64";
3338 break;
3339 default:
3340 llvm_unreachable("unexpected Neon polynomial vector element type");
3341 }
3342 } else
3343 EltName = mangleAArch64VectorBase(cast<BuiltinType>(EltType));
3344
3345 std::string TypeName =
3346 ("__" + EltName + "x" + Twine(T->getNumElements()) + "_t").str();
3347 Out << TypeName.length() << TypeName;
3348 }
mangleAArch64NeonVectorType(const DependentVectorType * T)3349 void CXXNameMangler::mangleAArch64NeonVectorType(const DependentVectorType *T) {
3350 DiagnosticsEngine &Diags = Context.getDiags();
3351 unsigned DiagID = Diags.getCustomDiagID(
3352 DiagnosticsEngine::Error,
3353 "cannot mangle this dependent neon vector type yet");
3354 Diags.Report(T->getAttributeLoc(), DiagID);
3355 }
3356
3357 // The AArch64 ACLE specifies that fixed-length SVE vector and predicate types
3358 // defined with the 'arm_sve_vector_bits' attribute map to the same AAPCS64
3359 // type as the sizeless variants.
3360 //
3361 // The mangling scheme for VLS types is implemented as a "pseudo" template:
3362 //
3363 // '__SVE_VLS<<type>, <vector length>>'
3364 //
3365 // Combining the existing SVE type and a specific vector length (in bits).
3366 // For example:
3367 //
3368 // typedef __SVInt32_t foo __attribute__((arm_sve_vector_bits(512)));
3369 //
3370 // is described as '__SVE_VLS<__SVInt32_t, 512u>' and mangled as:
3371 //
3372 // "9__SVE_VLSI" + base type mangling + "Lj" + __ARM_FEATURE_SVE_BITS + "EE"
3373 //
3374 // i.e. 9__SVE_VLSIu11__SVInt32_tLj512EE
3375 //
3376 // The latest ACLE specification (00bet5) does not contain details of this
3377 // mangling scheme, it will be specified in the next revision. The mangling
3378 // scheme is otherwise defined in the appendices to the Procedure Call Standard
3379 // for the Arm Architecture, see
3380 // https://github.com/ARM-software/abi-aa/blob/master/aapcs64/aapcs64.rst#appendix-c-mangling
mangleAArch64FixedSveVectorType(const VectorType * T)3381 void CXXNameMangler::mangleAArch64FixedSveVectorType(const VectorType *T) {
3382 assert((T->getVectorKind() == VectorType::SveFixedLengthDataVector ||
3383 T->getVectorKind() == VectorType::SveFixedLengthPredicateVector) &&
3384 "expected fixed-length SVE vector!");
3385
3386 QualType EltType = T->getElementType();
3387 assert(EltType->isBuiltinType() &&
3388 "expected builtin type for fixed-length SVE vector!");
3389
3390 StringRef TypeName;
3391 switch (cast<BuiltinType>(EltType)->getKind()) {
3392 case BuiltinType::SChar:
3393 TypeName = "__SVInt8_t";
3394 break;
3395 case BuiltinType::UChar: {
3396 if (T->getVectorKind() == VectorType::SveFixedLengthDataVector)
3397 TypeName = "__SVUint8_t";
3398 else
3399 TypeName = "__SVBool_t";
3400 break;
3401 }
3402 case BuiltinType::Short:
3403 TypeName = "__SVInt16_t";
3404 break;
3405 case BuiltinType::UShort:
3406 TypeName = "__SVUint16_t";
3407 break;
3408 case BuiltinType::Int:
3409 TypeName = "__SVInt32_t";
3410 break;
3411 case BuiltinType::UInt:
3412 TypeName = "__SVUint32_t";
3413 break;
3414 case BuiltinType::Long:
3415 TypeName = "__SVInt64_t";
3416 break;
3417 case BuiltinType::ULong:
3418 TypeName = "__SVUint64_t";
3419 break;
3420 case BuiltinType::Half:
3421 TypeName = "__SVFloat16_t";
3422 break;
3423 case BuiltinType::Float:
3424 TypeName = "__SVFloat32_t";
3425 break;
3426 case BuiltinType::Double:
3427 TypeName = "__SVFloat64_t";
3428 break;
3429 case BuiltinType::BFloat16:
3430 TypeName = "__SVBfloat16_t";
3431 break;
3432 default:
3433 llvm_unreachable("unexpected element type for fixed-length SVE vector!");
3434 }
3435
3436 unsigned VecSizeInBits = getASTContext().getTypeInfo(T).Width;
3437
3438 if (T->getVectorKind() == VectorType::SveFixedLengthPredicateVector)
3439 VecSizeInBits *= 8;
3440
3441 Out << "9__SVE_VLSI" << 'u' << TypeName.size() << TypeName << "Lj"
3442 << VecSizeInBits << "EE";
3443 }
3444
mangleAArch64FixedSveVectorType(const DependentVectorType * T)3445 void CXXNameMangler::mangleAArch64FixedSveVectorType(
3446 const DependentVectorType *T) {
3447 DiagnosticsEngine &Diags = Context.getDiags();
3448 unsigned DiagID = Diags.getCustomDiagID(
3449 DiagnosticsEngine::Error,
3450 "cannot mangle this dependent fixed-length SVE vector type yet");
3451 Diags.Report(T->getAttributeLoc(), DiagID);
3452 }
3453
3454 // GNU extension: vector types
3455 // <type> ::= <vector-type>
3456 // <vector-type> ::= Dv <positive dimension number> _
3457 // <extended element type>
3458 // ::= Dv [<dimension expression>] _ <element type>
3459 // <extended element type> ::= <element type>
3460 // ::= p # AltiVec vector pixel
3461 // ::= b # Altivec vector bool
mangleType(const VectorType * T)3462 void CXXNameMangler::mangleType(const VectorType *T) {
3463 if ((T->getVectorKind() == VectorType::NeonVector ||
3464 T->getVectorKind() == VectorType::NeonPolyVector)) {
3465 llvm::Triple Target = getASTContext().getTargetInfo().getTriple();
3466 llvm::Triple::ArchType Arch =
3467 getASTContext().getTargetInfo().getTriple().getArch();
3468 if ((Arch == llvm::Triple::aarch64 ||
3469 Arch == llvm::Triple::aarch64_be) && !Target.isOSDarwin())
3470 mangleAArch64NeonVectorType(T);
3471 else
3472 mangleNeonVectorType(T);
3473 return;
3474 } else if (T->getVectorKind() == VectorType::SveFixedLengthDataVector ||
3475 T->getVectorKind() == VectorType::SveFixedLengthPredicateVector) {
3476 mangleAArch64FixedSveVectorType(T);
3477 return;
3478 }
3479 Out << "Dv" << T->getNumElements() << '_';
3480 if (T->getVectorKind() == VectorType::AltiVecPixel)
3481 Out << 'p';
3482 else if (T->getVectorKind() == VectorType::AltiVecBool)
3483 Out << 'b';
3484 else
3485 mangleType(T->getElementType());
3486 }
3487
mangleType(const DependentVectorType * T)3488 void CXXNameMangler::mangleType(const DependentVectorType *T) {
3489 if ((T->getVectorKind() == VectorType::NeonVector ||
3490 T->getVectorKind() == VectorType::NeonPolyVector)) {
3491 llvm::Triple Target = getASTContext().getTargetInfo().getTriple();
3492 llvm::Triple::ArchType Arch =
3493 getASTContext().getTargetInfo().getTriple().getArch();
3494 if ((Arch == llvm::Triple::aarch64 || Arch == llvm::Triple::aarch64_be) &&
3495 !Target.isOSDarwin())
3496 mangleAArch64NeonVectorType(T);
3497 else
3498 mangleNeonVectorType(T);
3499 return;
3500 } else if (T->getVectorKind() == VectorType::SveFixedLengthDataVector ||
3501 T->getVectorKind() == VectorType::SveFixedLengthPredicateVector) {
3502 mangleAArch64FixedSveVectorType(T);
3503 return;
3504 }
3505
3506 Out << "Dv";
3507 mangleExpression(T->getSizeExpr());
3508 Out << '_';
3509 if (T->getVectorKind() == VectorType::AltiVecPixel)
3510 Out << 'p';
3511 else if (T->getVectorKind() == VectorType::AltiVecBool)
3512 Out << 'b';
3513 else
3514 mangleType(T->getElementType());
3515 }
3516
mangleType(const ExtVectorType * T)3517 void CXXNameMangler::mangleType(const ExtVectorType *T) {
3518 mangleType(static_cast<const VectorType*>(T));
3519 }
mangleType(const DependentSizedExtVectorType * T)3520 void CXXNameMangler::mangleType(const DependentSizedExtVectorType *T) {
3521 Out << "Dv";
3522 mangleExpression(T->getSizeExpr());
3523 Out << '_';
3524 mangleType(T->getElementType());
3525 }
3526
mangleType(const ConstantMatrixType * T)3527 void CXXNameMangler::mangleType(const ConstantMatrixType *T) {
3528 // Mangle matrix types as a vendor extended type:
3529 // u<Len>matrix_typeI<Rows><Columns><element type>E
3530
3531 StringRef VendorQualifier = "matrix_type";
3532 Out << "u" << VendorQualifier.size() << VendorQualifier;
3533
3534 Out << "I";
3535 auto &ASTCtx = getASTContext();
3536 unsigned BitWidth = ASTCtx.getTypeSize(ASTCtx.getSizeType());
3537 llvm::APSInt Rows(BitWidth);
3538 Rows = T->getNumRows();
3539 mangleIntegerLiteral(ASTCtx.getSizeType(), Rows);
3540 llvm::APSInt Columns(BitWidth);
3541 Columns = T->getNumColumns();
3542 mangleIntegerLiteral(ASTCtx.getSizeType(), Columns);
3543 mangleType(T->getElementType());
3544 Out << "E";
3545 }
3546
mangleType(const DependentSizedMatrixType * T)3547 void CXXNameMangler::mangleType(const DependentSizedMatrixType *T) {
3548 // Mangle matrix types as a vendor extended type:
3549 // u<Len>matrix_typeI<row expr><column expr><element type>E
3550 StringRef VendorQualifier = "matrix_type";
3551 Out << "u" << VendorQualifier.size() << VendorQualifier;
3552
3553 Out << "I";
3554 mangleTemplateArgExpr(T->getRowExpr());
3555 mangleTemplateArgExpr(T->getColumnExpr());
3556 mangleType(T->getElementType());
3557 Out << "E";
3558 }
3559
mangleType(const DependentAddressSpaceType * T)3560 void CXXNameMangler::mangleType(const DependentAddressSpaceType *T) {
3561 SplitQualType split = T->getPointeeType().split();
3562 mangleQualifiers(split.Quals, T);
3563 mangleType(QualType(split.Ty, 0));
3564 }
3565
mangleType(const PackExpansionType * T)3566 void CXXNameMangler::mangleType(const PackExpansionType *T) {
3567 // <type> ::= Dp <type> # pack expansion (C++0x)
3568 Out << "Dp";
3569 mangleType(T->getPattern());
3570 }
3571
mangleType(const ObjCInterfaceType * T)3572 void CXXNameMangler::mangleType(const ObjCInterfaceType *T) {
3573 mangleSourceName(T->getDecl()->getIdentifier());
3574 }
3575
mangleType(const ObjCObjectType * T)3576 void CXXNameMangler::mangleType(const ObjCObjectType *T) {
3577 // Treat __kindof as a vendor extended type qualifier.
3578 if (T->isKindOfType())
3579 Out << "U8__kindof";
3580
3581 if (!T->qual_empty()) {
3582 // Mangle protocol qualifiers.
3583 SmallString<64> QualStr;
3584 llvm::raw_svector_ostream QualOS(QualStr);
3585 QualOS << "objcproto";
3586 for (const auto *I : T->quals()) {
3587 StringRef name = I->getName();
3588 QualOS << name.size() << name;
3589 }
3590 Out << 'U' << QualStr.size() << QualStr;
3591 }
3592
3593 mangleType(T->getBaseType());
3594
3595 if (T->isSpecialized()) {
3596 // Mangle type arguments as I <type>+ E
3597 Out << 'I';
3598 for (auto typeArg : T->getTypeArgs())
3599 mangleType(typeArg);
3600 Out << 'E';
3601 }
3602 }
3603
mangleType(const BlockPointerType * T)3604 void CXXNameMangler::mangleType(const BlockPointerType *T) {
3605 Out << "U13block_pointer";
3606 mangleType(T->getPointeeType());
3607 }
3608
mangleType(const InjectedClassNameType * T)3609 void CXXNameMangler::mangleType(const InjectedClassNameType *T) {
3610 // Mangle injected class name types as if the user had written the
3611 // specialization out fully. It may not actually be possible to see
3612 // this mangling, though.
3613 mangleType(T->getInjectedSpecializationType());
3614 }
3615
mangleType(const TemplateSpecializationType * T)3616 void CXXNameMangler::mangleType(const TemplateSpecializationType *T) {
3617 if (TemplateDecl *TD = T->getTemplateName().getAsTemplateDecl()) {
3618 mangleTemplateName(TD, T->getArgs(), T->getNumArgs());
3619 } else {
3620 if (mangleSubstitution(QualType(T, 0)))
3621 return;
3622
3623 mangleTemplatePrefix(T->getTemplateName());
3624
3625 // FIXME: GCC does not appear to mangle the template arguments when
3626 // the template in question is a dependent template name. Should we
3627 // emulate that badness?
3628 mangleTemplateArgs(T->getTemplateName(), T->getArgs(), T->getNumArgs());
3629 addSubstitution(QualType(T, 0));
3630 }
3631 }
3632
mangleType(const DependentNameType * T)3633 void CXXNameMangler::mangleType(const DependentNameType *T) {
3634 // Proposal by cxx-abi-dev, 2014-03-26
3635 // <class-enum-type> ::= <name> # non-dependent or dependent type name or
3636 // # dependent elaborated type specifier using
3637 // # 'typename'
3638 // ::= Ts <name> # dependent elaborated type specifier using
3639 // # 'struct' or 'class'
3640 // ::= Tu <name> # dependent elaborated type specifier using
3641 // # 'union'
3642 // ::= Te <name> # dependent elaborated type specifier using
3643 // # 'enum'
3644 switch (T->getKeyword()) {
3645 case ETK_None:
3646 case ETK_Typename:
3647 break;
3648 case ETK_Struct:
3649 case ETK_Class:
3650 case ETK_Interface:
3651 Out << "Ts";
3652 break;
3653 case ETK_Union:
3654 Out << "Tu";
3655 break;
3656 case ETK_Enum:
3657 Out << "Te";
3658 break;
3659 }
3660 // Typename types are always nested
3661 Out << 'N';
3662 manglePrefix(T->getQualifier());
3663 mangleSourceName(T->getIdentifier());
3664 Out << 'E';
3665 }
3666
mangleType(const DependentTemplateSpecializationType * T)3667 void CXXNameMangler::mangleType(const DependentTemplateSpecializationType *T) {
3668 // Dependently-scoped template types are nested if they have a prefix.
3669 Out << 'N';
3670
3671 // TODO: avoid making this TemplateName.
3672 TemplateName Prefix =
3673 getASTContext().getDependentTemplateName(T->getQualifier(),
3674 T->getIdentifier());
3675 mangleTemplatePrefix(Prefix);
3676
3677 // FIXME: GCC does not appear to mangle the template arguments when
3678 // the template in question is a dependent template name. Should we
3679 // emulate that badness?
3680 mangleTemplateArgs(Prefix, T->getArgs(), T->getNumArgs());
3681 Out << 'E';
3682 }
3683
mangleType(const TypeOfType * T)3684 void CXXNameMangler::mangleType(const TypeOfType *T) {
3685 // FIXME: this is pretty unsatisfactory, but there isn't an obvious
3686 // "extension with parameters" mangling.
3687 Out << "u6typeof";
3688 }
3689
mangleType(const TypeOfExprType * T)3690 void CXXNameMangler::mangleType(const TypeOfExprType *T) {
3691 // FIXME: this is pretty unsatisfactory, but there isn't an obvious
3692 // "extension with parameters" mangling.
3693 Out << "u6typeof";
3694 }
3695
mangleType(const DecltypeType * T)3696 void CXXNameMangler::mangleType(const DecltypeType *T) {
3697 Expr *E = T->getUnderlyingExpr();
3698
3699 // type ::= Dt <expression> E # decltype of an id-expression
3700 // # or class member access
3701 // ::= DT <expression> E # decltype of an expression
3702
3703 // This purports to be an exhaustive list of id-expressions and
3704 // class member accesses. Note that we do not ignore parentheses;
3705 // parentheses change the semantics of decltype for these
3706 // expressions (and cause the mangler to use the other form).
3707 if (isa<DeclRefExpr>(E) ||
3708 isa<MemberExpr>(E) ||
3709 isa<UnresolvedLookupExpr>(E) ||
3710 isa<DependentScopeDeclRefExpr>(E) ||
3711 isa<CXXDependentScopeMemberExpr>(E) ||
3712 isa<UnresolvedMemberExpr>(E))
3713 Out << "Dt";
3714 else
3715 Out << "DT";
3716 mangleExpression(E);
3717 Out << 'E';
3718 }
3719
mangleType(const UnaryTransformType * T)3720 void CXXNameMangler::mangleType(const UnaryTransformType *T) {
3721 // If this is dependent, we need to record that. If not, we simply
3722 // mangle it as the underlying type since they are equivalent.
3723 if (T->isDependentType()) {
3724 Out << 'U';
3725
3726 switch (T->getUTTKind()) {
3727 case UnaryTransformType::EnumUnderlyingType:
3728 Out << "3eut";
3729 break;
3730 }
3731 }
3732
3733 mangleType(T->getBaseType());
3734 }
3735
mangleType(const AutoType * T)3736 void CXXNameMangler::mangleType(const AutoType *T) {
3737 assert(T->getDeducedType().isNull() &&
3738 "Deduced AutoType shouldn't be handled here!");
3739 assert(T->getKeyword() != AutoTypeKeyword::GNUAutoType &&
3740 "shouldn't need to mangle __auto_type!");
3741 // <builtin-type> ::= Da # auto
3742 // ::= Dc # decltype(auto)
3743 Out << (T->isDecltypeAuto() ? "Dc" : "Da");
3744 }
3745
mangleType(const DeducedTemplateSpecializationType * T)3746 void CXXNameMangler::mangleType(const DeducedTemplateSpecializationType *T) {
3747 QualType Deduced = T->getDeducedType();
3748 if (!Deduced.isNull())
3749 return mangleType(Deduced);
3750
3751 TemplateDecl *TD = T->getTemplateName().getAsTemplateDecl();
3752 assert(TD && "shouldn't form deduced TST unless we know we have a template");
3753
3754 if (mangleSubstitution(TD))
3755 return;
3756
3757 mangleName(GlobalDecl(TD));
3758 addSubstitution(TD);
3759 }
3760
mangleType(const AtomicType * T)3761 void CXXNameMangler::mangleType(const AtomicType *T) {
3762 // <type> ::= U <source-name> <type> # vendor extended type qualifier
3763 // (Until there's a standardized mangling...)
3764 Out << "U7_Atomic";
3765 mangleType(T->getValueType());
3766 }
3767
mangleType(const PipeType * T)3768 void CXXNameMangler::mangleType(const PipeType *T) {
3769 // Pipe type mangling rules are described in SPIR 2.0 specification
3770 // A.1 Data types and A.3 Summary of changes
3771 // <type> ::= 8ocl_pipe
3772 Out << "8ocl_pipe";
3773 }
3774
mangleType(const ExtIntType * T)3775 void CXXNameMangler::mangleType(const ExtIntType *T) {
3776 Out << "U7_ExtInt";
3777 llvm::APSInt BW(32, true);
3778 BW = T->getNumBits();
3779 TemplateArgument TA(Context.getASTContext(), BW, getASTContext().IntTy);
3780 mangleTemplateArgs(TemplateName(), &TA, 1);
3781 if (T->isUnsigned())
3782 Out << "j";
3783 else
3784 Out << "i";
3785 }
3786
mangleType(const DependentExtIntType * T)3787 void CXXNameMangler::mangleType(const DependentExtIntType *T) {
3788 Out << "U7_ExtInt";
3789 TemplateArgument TA(T->getNumBitsExpr());
3790 mangleTemplateArgs(TemplateName(), &TA, 1);
3791 if (T->isUnsigned())
3792 Out << "j";
3793 else
3794 Out << "i";
3795 }
3796
mangleIntegerLiteral(QualType T,const llvm::APSInt & Value)3797 void CXXNameMangler::mangleIntegerLiteral(QualType T,
3798 const llvm::APSInt &Value) {
3799 // <expr-primary> ::= L <type> <value number> E # integer literal
3800 Out << 'L';
3801
3802 mangleType(T);
3803 if (T->isBooleanType()) {
3804 // Boolean values are encoded as 0/1.
3805 Out << (Value.getBoolValue() ? '1' : '0');
3806 } else {
3807 mangleNumber(Value);
3808 }
3809 Out << 'E';
3810
3811 }
3812
mangleMemberExprBase(const Expr * Base,bool IsArrow)3813 void CXXNameMangler::mangleMemberExprBase(const Expr *Base, bool IsArrow) {
3814 // Ignore member expressions involving anonymous unions.
3815 while (const auto *RT = Base->getType()->getAs<RecordType>()) {
3816 if (!RT->getDecl()->isAnonymousStructOrUnion())
3817 break;
3818 const auto *ME = dyn_cast<MemberExpr>(Base);
3819 if (!ME)
3820 break;
3821 Base = ME->getBase();
3822 IsArrow = ME->isArrow();
3823 }
3824
3825 if (Base->isImplicitCXXThis()) {
3826 // Note: GCC mangles member expressions to the implicit 'this' as
3827 // *this., whereas we represent them as this->. The Itanium C++ ABI
3828 // does not specify anything here, so we follow GCC.
3829 Out << "dtdefpT";
3830 } else {
3831 Out << (IsArrow ? "pt" : "dt");
3832 mangleExpression(Base);
3833 }
3834 }
3835
3836 /// Mangles a member expression.
mangleMemberExpr(const Expr * base,bool isArrow,NestedNameSpecifier * qualifier,NamedDecl * firstQualifierLookup,DeclarationName member,const TemplateArgumentLoc * TemplateArgs,unsigned NumTemplateArgs,unsigned arity)3837 void CXXNameMangler::mangleMemberExpr(const Expr *base,
3838 bool isArrow,
3839 NestedNameSpecifier *qualifier,
3840 NamedDecl *firstQualifierLookup,
3841 DeclarationName member,
3842 const TemplateArgumentLoc *TemplateArgs,
3843 unsigned NumTemplateArgs,
3844 unsigned arity) {
3845 // <expression> ::= dt <expression> <unresolved-name>
3846 // ::= pt <expression> <unresolved-name>
3847 if (base)
3848 mangleMemberExprBase(base, isArrow);
3849 mangleUnresolvedName(qualifier, member, TemplateArgs, NumTemplateArgs, arity);
3850 }
3851
3852 /// Look at the callee of the given call expression and determine if
3853 /// it's a parenthesized id-expression which would have triggered ADL
3854 /// otherwise.
isParenthesizedADLCallee(const CallExpr * call)3855 static bool isParenthesizedADLCallee(const CallExpr *call) {
3856 const Expr *callee = call->getCallee();
3857 const Expr *fn = callee->IgnoreParens();
3858
3859 // Must be parenthesized. IgnoreParens() skips __extension__ nodes,
3860 // too, but for those to appear in the callee, it would have to be
3861 // parenthesized.
3862 if (callee == fn) return false;
3863
3864 // Must be an unresolved lookup.
3865 const UnresolvedLookupExpr *lookup = dyn_cast<UnresolvedLookupExpr>(fn);
3866 if (!lookup) return false;
3867
3868 assert(!lookup->requiresADL());
3869
3870 // Must be an unqualified lookup.
3871 if (lookup->getQualifier()) return false;
3872
3873 // Must not have found a class member. Note that if one is a class
3874 // member, they're all class members.
3875 if (lookup->getNumDecls() > 0 &&
3876 (*lookup->decls_begin())->isCXXClassMember())
3877 return false;
3878
3879 // Otherwise, ADL would have been triggered.
3880 return true;
3881 }
3882
mangleCastExpression(const Expr * E,StringRef CastEncoding)3883 void CXXNameMangler::mangleCastExpression(const Expr *E, StringRef CastEncoding) {
3884 const ExplicitCastExpr *ECE = cast<ExplicitCastExpr>(E);
3885 Out << CastEncoding;
3886 mangleType(ECE->getType());
3887 mangleExpression(ECE->getSubExpr());
3888 }
3889
mangleInitListElements(const InitListExpr * InitList)3890 void CXXNameMangler::mangleInitListElements(const InitListExpr *InitList) {
3891 if (auto *Syntactic = InitList->getSyntacticForm())
3892 InitList = Syntactic;
3893 for (unsigned i = 0, e = InitList->getNumInits(); i != e; ++i)
3894 mangleExpression(InitList->getInit(i));
3895 }
3896
mangleExpression(const Expr * E,unsigned Arity,bool AsTemplateArg)3897 void CXXNameMangler::mangleExpression(const Expr *E, unsigned Arity,
3898 bool AsTemplateArg) {
3899 // <expression> ::= <unary operator-name> <expression>
3900 // ::= <binary operator-name> <expression> <expression>
3901 // ::= <trinary operator-name> <expression> <expression> <expression>
3902 // ::= cv <type> expression # conversion with one argument
3903 // ::= cv <type> _ <expression>* E # conversion with a different number of arguments
3904 // ::= dc <type> <expression> # dynamic_cast<type> (expression)
3905 // ::= sc <type> <expression> # static_cast<type> (expression)
3906 // ::= cc <type> <expression> # const_cast<type> (expression)
3907 // ::= rc <type> <expression> # reinterpret_cast<type> (expression)
3908 // ::= st <type> # sizeof (a type)
3909 // ::= at <type> # alignof (a type)
3910 // ::= <template-param>
3911 // ::= <function-param>
3912 // ::= fpT # 'this' expression (part of <function-param>)
3913 // ::= sr <type> <unqualified-name> # dependent name
3914 // ::= sr <type> <unqualified-name> <template-args> # dependent template-id
3915 // ::= ds <expression> <expression> # expr.*expr
3916 // ::= sZ <template-param> # size of a parameter pack
3917 // ::= sZ <function-param> # size of a function parameter pack
3918 // ::= u <source-name> <template-arg>* E # vendor extended expression
3919 // ::= <expr-primary>
3920 // <expr-primary> ::= L <type> <value number> E # integer literal
3921 // ::= L <type> <value float> E # floating literal
3922 // ::= L <type> <string type> E # string literal
3923 // ::= L <nullptr type> E # nullptr literal "LDnE"
3924 // ::= L <pointer type> 0 E # null pointer template argument
3925 // ::= L <type> <real-part float> _ <imag-part float> E # complex floating point literal (C99); not used by clang
3926 // ::= L <mangled-name> E # external name
3927 QualType ImplicitlyConvertedToType;
3928
3929 // A top-level expression that's not <expr-primary> needs to be wrapped in
3930 // X...E in a template arg.
3931 bool IsPrimaryExpr = true;
3932 auto NotPrimaryExpr = [&] {
3933 if (AsTemplateArg && IsPrimaryExpr)
3934 Out << 'X';
3935 IsPrimaryExpr = false;
3936 };
3937
3938 auto MangleDeclRefExpr = [&](const NamedDecl *D) {
3939 switch (D->getKind()) {
3940 default:
3941 // <expr-primary> ::= L <mangled-name> E # external name
3942 Out << 'L';
3943 mangle(D);
3944 Out << 'E';
3945 break;
3946
3947 case Decl::ParmVar:
3948 NotPrimaryExpr();
3949 mangleFunctionParam(cast<ParmVarDecl>(D));
3950 break;
3951
3952 case Decl::EnumConstant: {
3953 // <expr-primary>
3954 const EnumConstantDecl *ED = cast<EnumConstantDecl>(D);
3955 mangleIntegerLiteral(ED->getType(), ED->getInitVal());
3956 break;
3957 }
3958
3959 case Decl::NonTypeTemplateParm:
3960 NotPrimaryExpr();
3961 const NonTypeTemplateParmDecl *PD = cast<NonTypeTemplateParmDecl>(D);
3962 mangleTemplateParameter(PD->getDepth(), PD->getIndex());
3963 break;
3964 }
3965 };
3966
3967 // 'goto recurse' is used when handling a simple "unwrapping" node which
3968 // produces no output, where ImplicitlyConvertedToType and AsTemplateArg need
3969 // to be preserved.
3970 recurse:
3971 switch (E->getStmtClass()) {
3972 case Expr::NoStmtClass:
3973 #define ABSTRACT_STMT(Type)
3974 #define EXPR(Type, Base)
3975 #define STMT(Type, Base) \
3976 case Expr::Type##Class:
3977 #include "clang/AST/StmtNodes.inc"
3978 // fallthrough
3979
3980 // These all can only appear in local or variable-initialization
3981 // contexts and so should never appear in a mangling.
3982 case Expr::AddrLabelExprClass:
3983 case Expr::DesignatedInitUpdateExprClass:
3984 case Expr::ImplicitValueInitExprClass:
3985 case Expr::ArrayInitLoopExprClass:
3986 case Expr::ArrayInitIndexExprClass:
3987 case Expr::NoInitExprClass:
3988 case Expr::ParenListExprClass:
3989 case Expr::LambdaExprClass:
3990 case Expr::MSPropertyRefExprClass:
3991 case Expr::MSPropertySubscriptExprClass:
3992 case Expr::TypoExprClass: // This should no longer exist in the AST by now.
3993 case Expr::RecoveryExprClass:
3994 case Expr::OMPArraySectionExprClass:
3995 case Expr::OMPArrayShapingExprClass:
3996 case Expr::OMPIteratorExprClass:
3997 case Expr::CXXInheritedCtorInitExprClass:
3998 llvm_unreachable("unexpected statement kind");
3999
4000 case Expr::ConstantExprClass:
4001 E = cast<ConstantExpr>(E)->getSubExpr();
4002 goto recurse;
4003
4004 // FIXME: invent manglings for all these.
4005 case Expr::BlockExprClass:
4006 case Expr::ChooseExprClass:
4007 case Expr::CompoundLiteralExprClass:
4008 case Expr::ExtVectorElementExprClass:
4009 case Expr::GenericSelectionExprClass:
4010 case Expr::ObjCEncodeExprClass:
4011 case Expr::ObjCIsaExprClass:
4012 case Expr::ObjCIvarRefExprClass:
4013 case Expr::ObjCMessageExprClass:
4014 case Expr::ObjCPropertyRefExprClass:
4015 case Expr::ObjCProtocolExprClass:
4016 case Expr::ObjCSelectorExprClass:
4017 case Expr::ObjCStringLiteralClass:
4018 case Expr::ObjCBoxedExprClass:
4019 case Expr::ObjCArrayLiteralClass:
4020 case Expr::ObjCDictionaryLiteralClass:
4021 case Expr::ObjCSubscriptRefExprClass:
4022 case Expr::ObjCIndirectCopyRestoreExprClass:
4023 case Expr::ObjCAvailabilityCheckExprClass:
4024 case Expr::OffsetOfExprClass:
4025 case Expr::PredefinedExprClass:
4026 case Expr::ShuffleVectorExprClass:
4027 case Expr::ConvertVectorExprClass:
4028 case Expr::StmtExprClass:
4029 case Expr::TypeTraitExprClass:
4030 case Expr::RequiresExprClass:
4031 case Expr::ArrayTypeTraitExprClass:
4032 case Expr::ExpressionTraitExprClass:
4033 case Expr::VAArgExprClass:
4034 case Expr::CUDAKernelCallExprClass:
4035 case Expr::AsTypeExprClass:
4036 case Expr::PseudoObjectExprClass:
4037 case Expr::AtomicExprClass:
4038 case Expr::SourceLocExprClass:
4039 case Expr::BuiltinBitCastExprClass:
4040 {
4041 NotPrimaryExpr();
4042 if (!NullOut) {
4043 // As bad as this diagnostic is, it's better than crashing.
4044 DiagnosticsEngine &Diags = Context.getDiags();
4045 unsigned DiagID = Diags.getCustomDiagID(DiagnosticsEngine::Error,
4046 "cannot yet mangle expression type %0");
4047 Diags.Report(E->getExprLoc(), DiagID)
4048 << E->getStmtClassName() << E->getSourceRange();
4049 return;
4050 }
4051 break;
4052 }
4053
4054 case Expr::CXXUuidofExprClass: {
4055 NotPrimaryExpr();
4056 const CXXUuidofExpr *UE = cast<CXXUuidofExpr>(E);
4057 // As of clang 12, uuidof uses the vendor extended expression
4058 // mangling. Previously, it used a special-cased nonstandard extension.
4059 if (Context.getASTContext().getLangOpts().getClangABICompat() >
4060 LangOptions::ClangABI::Ver11) {
4061 Out << "u8__uuidof";
4062 if (UE->isTypeOperand())
4063 mangleType(UE->getTypeOperand(Context.getASTContext()));
4064 else
4065 mangleTemplateArgExpr(UE->getExprOperand());
4066 Out << 'E';
4067 } else {
4068 if (UE->isTypeOperand()) {
4069 QualType UuidT = UE->getTypeOperand(Context.getASTContext());
4070 Out << "u8__uuidoft";
4071 mangleType(UuidT);
4072 } else {
4073 Expr *UuidExp = UE->getExprOperand();
4074 Out << "u8__uuidofz";
4075 mangleExpression(UuidExp);
4076 }
4077 }
4078 break;
4079 }
4080
4081 // Even gcc-4.5 doesn't mangle this.
4082 case Expr::BinaryConditionalOperatorClass: {
4083 NotPrimaryExpr();
4084 DiagnosticsEngine &Diags = Context.getDiags();
4085 unsigned DiagID =
4086 Diags.getCustomDiagID(DiagnosticsEngine::Error,
4087 "?: operator with omitted middle operand cannot be mangled");
4088 Diags.Report(E->getExprLoc(), DiagID)
4089 << E->getStmtClassName() << E->getSourceRange();
4090 return;
4091 }
4092
4093 // These are used for internal purposes and cannot be meaningfully mangled.
4094 case Expr::OpaqueValueExprClass:
4095 llvm_unreachable("cannot mangle opaque value; mangling wrong thing?");
4096
4097 case Expr::InitListExprClass: {
4098 NotPrimaryExpr();
4099 Out << "il";
4100 mangleInitListElements(cast<InitListExpr>(E));
4101 Out << "E";
4102 break;
4103 }
4104
4105 case Expr::DesignatedInitExprClass: {
4106 NotPrimaryExpr();
4107 auto *DIE = cast<DesignatedInitExpr>(E);
4108 for (const auto &Designator : DIE->designators()) {
4109 if (Designator.isFieldDesignator()) {
4110 Out << "di";
4111 mangleSourceName(Designator.getFieldName());
4112 } else if (Designator.isArrayDesignator()) {
4113 Out << "dx";
4114 mangleExpression(DIE->getArrayIndex(Designator));
4115 } else {
4116 assert(Designator.isArrayRangeDesignator() &&
4117 "unknown designator kind");
4118 Out << "dX";
4119 mangleExpression(DIE->getArrayRangeStart(Designator));
4120 mangleExpression(DIE->getArrayRangeEnd(Designator));
4121 }
4122 }
4123 mangleExpression(DIE->getInit());
4124 break;
4125 }
4126
4127 case Expr::CXXDefaultArgExprClass:
4128 E = cast<CXXDefaultArgExpr>(E)->getExpr();
4129 goto recurse;
4130
4131 case Expr::CXXDefaultInitExprClass:
4132 E = cast<CXXDefaultInitExpr>(E)->getExpr();
4133 goto recurse;
4134
4135 case Expr::CXXStdInitializerListExprClass:
4136 E = cast<CXXStdInitializerListExpr>(E)->getSubExpr();
4137 goto recurse;
4138
4139 case Expr::SubstNonTypeTemplateParmExprClass:
4140 E = cast<SubstNonTypeTemplateParmExpr>(E)->getReplacement();
4141 goto recurse;
4142
4143 case Expr::UserDefinedLiteralClass:
4144 // We follow g++'s approach of mangling a UDL as a call to the literal
4145 // operator.
4146 case Expr::CXXMemberCallExprClass: // fallthrough
4147 case Expr::CallExprClass: {
4148 NotPrimaryExpr();
4149 const CallExpr *CE = cast<CallExpr>(E);
4150
4151 // <expression> ::= cp <simple-id> <expression>* E
4152 // We use this mangling only when the call would use ADL except
4153 // for being parenthesized. Per discussion with David
4154 // Vandervoorde, 2011.04.25.
4155 if (isParenthesizedADLCallee(CE)) {
4156 Out << "cp";
4157 // The callee here is a parenthesized UnresolvedLookupExpr with
4158 // no qualifier and should always get mangled as a <simple-id>
4159 // anyway.
4160
4161 // <expression> ::= cl <expression>* E
4162 } else {
4163 Out << "cl";
4164 }
4165
4166 unsigned CallArity = CE->getNumArgs();
4167 for (const Expr *Arg : CE->arguments())
4168 if (isa<PackExpansionExpr>(Arg))
4169 CallArity = UnknownArity;
4170
4171 mangleExpression(CE->getCallee(), CallArity);
4172 for (const Expr *Arg : CE->arguments())
4173 mangleExpression(Arg);
4174 Out << 'E';
4175 break;
4176 }
4177
4178 case Expr::CXXNewExprClass: {
4179 NotPrimaryExpr();
4180 const CXXNewExpr *New = cast<CXXNewExpr>(E);
4181 if (New->isGlobalNew()) Out << "gs";
4182 Out << (New->isArray() ? "na" : "nw");
4183 for (CXXNewExpr::const_arg_iterator I = New->placement_arg_begin(),
4184 E = New->placement_arg_end(); I != E; ++I)
4185 mangleExpression(*I);
4186 Out << '_';
4187 mangleType(New->getAllocatedType());
4188 if (New->hasInitializer()) {
4189 if (New->getInitializationStyle() == CXXNewExpr::ListInit)
4190 Out << "il";
4191 else
4192 Out << "pi";
4193 const Expr *Init = New->getInitializer();
4194 if (const CXXConstructExpr *CCE = dyn_cast<CXXConstructExpr>(Init)) {
4195 // Directly inline the initializers.
4196 for (CXXConstructExpr::const_arg_iterator I = CCE->arg_begin(),
4197 E = CCE->arg_end();
4198 I != E; ++I)
4199 mangleExpression(*I);
4200 } else if (const ParenListExpr *PLE = dyn_cast<ParenListExpr>(Init)) {
4201 for (unsigned i = 0, e = PLE->getNumExprs(); i != e; ++i)
4202 mangleExpression(PLE->getExpr(i));
4203 } else if (New->getInitializationStyle() == CXXNewExpr::ListInit &&
4204 isa<InitListExpr>(Init)) {
4205 // Only take InitListExprs apart for list-initialization.
4206 mangleInitListElements(cast<InitListExpr>(Init));
4207 } else
4208 mangleExpression(Init);
4209 }
4210 Out << 'E';
4211 break;
4212 }
4213
4214 case Expr::CXXPseudoDestructorExprClass: {
4215 NotPrimaryExpr();
4216 const auto *PDE = cast<CXXPseudoDestructorExpr>(E);
4217 if (const Expr *Base = PDE->getBase())
4218 mangleMemberExprBase(Base, PDE->isArrow());
4219 NestedNameSpecifier *Qualifier = PDE->getQualifier();
4220 if (TypeSourceInfo *ScopeInfo = PDE->getScopeTypeInfo()) {
4221 if (Qualifier) {
4222 mangleUnresolvedPrefix(Qualifier,
4223 /*recursive=*/true);
4224 mangleUnresolvedTypeOrSimpleId(ScopeInfo->getType());
4225 Out << 'E';
4226 } else {
4227 Out << "sr";
4228 if (!mangleUnresolvedTypeOrSimpleId(ScopeInfo->getType()))
4229 Out << 'E';
4230 }
4231 } else if (Qualifier) {
4232 mangleUnresolvedPrefix(Qualifier);
4233 }
4234 // <base-unresolved-name> ::= dn <destructor-name>
4235 Out << "dn";
4236 QualType DestroyedType = PDE->getDestroyedType();
4237 mangleUnresolvedTypeOrSimpleId(DestroyedType);
4238 break;
4239 }
4240
4241 case Expr::MemberExprClass: {
4242 NotPrimaryExpr();
4243 const MemberExpr *ME = cast<MemberExpr>(E);
4244 mangleMemberExpr(ME->getBase(), ME->isArrow(),
4245 ME->getQualifier(), nullptr,
4246 ME->getMemberDecl()->getDeclName(),
4247 ME->getTemplateArgs(), ME->getNumTemplateArgs(),
4248 Arity);
4249 break;
4250 }
4251
4252 case Expr::UnresolvedMemberExprClass: {
4253 NotPrimaryExpr();
4254 const UnresolvedMemberExpr *ME = cast<UnresolvedMemberExpr>(E);
4255 mangleMemberExpr(ME->isImplicitAccess() ? nullptr : ME->getBase(),
4256 ME->isArrow(), ME->getQualifier(), nullptr,
4257 ME->getMemberName(),
4258 ME->getTemplateArgs(), ME->getNumTemplateArgs(),
4259 Arity);
4260 break;
4261 }
4262
4263 case Expr::CXXDependentScopeMemberExprClass: {
4264 NotPrimaryExpr();
4265 const CXXDependentScopeMemberExpr *ME
4266 = cast<CXXDependentScopeMemberExpr>(E);
4267 mangleMemberExpr(ME->isImplicitAccess() ? nullptr : ME->getBase(),
4268 ME->isArrow(), ME->getQualifier(),
4269 ME->getFirstQualifierFoundInScope(),
4270 ME->getMember(),
4271 ME->getTemplateArgs(), ME->getNumTemplateArgs(),
4272 Arity);
4273 break;
4274 }
4275
4276 case Expr::UnresolvedLookupExprClass: {
4277 NotPrimaryExpr();
4278 const UnresolvedLookupExpr *ULE = cast<UnresolvedLookupExpr>(E);
4279 mangleUnresolvedName(ULE->getQualifier(), ULE->getName(),
4280 ULE->getTemplateArgs(), ULE->getNumTemplateArgs(),
4281 Arity);
4282 break;
4283 }
4284
4285 case Expr::CXXUnresolvedConstructExprClass: {
4286 NotPrimaryExpr();
4287 const CXXUnresolvedConstructExpr *CE = cast<CXXUnresolvedConstructExpr>(E);
4288 unsigned N = CE->getNumArgs();
4289
4290 if (CE->isListInitialization()) {
4291 assert(N == 1 && "unexpected form for list initialization");
4292 auto *IL = cast<InitListExpr>(CE->getArg(0));
4293 Out << "tl";
4294 mangleType(CE->getType());
4295 mangleInitListElements(IL);
4296 Out << "E";
4297 break;
4298 }
4299
4300 Out << "cv";
4301 mangleType(CE->getType());
4302 if (N != 1) Out << '_';
4303 for (unsigned I = 0; I != N; ++I) mangleExpression(CE->getArg(I));
4304 if (N != 1) Out << 'E';
4305 break;
4306 }
4307
4308 case Expr::CXXConstructExprClass: {
4309 // An implicit cast is silent, thus may contain <expr-primary>.
4310 const auto *CE = cast<CXXConstructExpr>(E);
4311 if (!CE->isListInitialization() || CE->isStdInitListInitialization()) {
4312 assert(
4313 CE->getNumArgs() >= 1 &&
4314 (CE->getNumArgs() == 1 || isa<CXXDefaultArgExpr>(CE->getArg(1))) &&
4315 "implicit CXXConstructExpr must have one argument");
4316 E = cast<CXXConstructExpr>(E)->getArg(0);
4317 goto recurse;
4318 }
4319 NotPrimaryExpr();
4320 Out << "il";
4321 for (auto *E : CE->arguments())
4322 mangleExpression(E);
4323 Out << "E";
4324 break;
4325 }
4326
4327 case Expr::CXXTemporaryObjectExprClass: {
4328 NotPrimaryExpr();
4329 const auto *CE = cast<CXXTemporaryObjectExpr>(E);
4330 unsigned N = CE->getNumArgs();
4331 bool List = CE->isListInitialization();
4332
4333 if (List)
4334 Out << "tl";
4335 else
4336 Out << "cv";
4337 mangleType(CE->getType());
4338 if (!List && N != 1)
4339 Out << '_';
4340 if (CE->isStdInitListInitialization()) {
4341 // We implicitly created a std::initializer_list<T> for the first argument
4342 // of a constructor of type U in an expression of the form U{a, b, c}.
4343 // Strip all the semantic gunk off the initializer list.
4344 auto *SILE =
4345 cast<CXXStdInitializerListExpr>(CE->getArg(0)->IgnoreImplicit());
4346 auto *ILE = cast<InitListExpr>(SILE->getSubExpr()->IgnoreImplicit());
4347 mangleInitListElements(ILE);
4348 } else {
4349 for (auto *E : CE->arguments())
4350 mangleExpression(E);
4351 }
4352 if (List || N != 1)
4353 Out << 'E';
4354 break;
4355 }
4356
4357 case Expr::CXXScalarValueInitExprClass:
4358 NotPrimaryExpr();
4359 Out << "cv";
4360 mangleType(E->getType());
4361 Out << "_E";
4362 break;
4363
4364 case Expr::CXXNoexceptExprClass:
4365 NotPrimaryExpr();
4366 Out << "nx";
4367 mangleExpression(cast<CXXNoexceptExpr>(E)->getOperand());
4368 break;
4369
4370 case Expr::UnaryExprOrTypeTraitExprClass: {
4371 // Non-instantiation-dependent traits are an <expr-primary> integer literal.
4372 const UnaryExprOrTypeTraitExpr *SAE = cast<UnaryExprOrTypeTraitExpr>(E);
4373
4374 if (!SAE->isInstantiationDependent()) {
4375 // Itanium C++ ABI:
4376 // If the operand of a sizeof or alignof operator is not
4377 // instantiation-dependent it is encoded as an integer literal
4378 // reflecting the result of the operator.
4379 //
4380 // If the result of the operator is implicitly converted to a known
4381 // integer type, that type is used for the literal; otherwise, the type
4382 // of std::size_t or std::ptrdiff_t is used.
4383 QualType T = (ImplicitlyConvertedToType.isNull() ||
4384 !ImplicitlyConvertedToType->isIntegerType())? SAE->getType()
4385 : ImplicitlyConvertedToType;
4386 llvm::APSInt V = SAE->EvaluateKnownConstInt(Context.getASTContext());
4387 mangleIntegerLiteral(T, V);
4388 break;
4389 }
4390
4391 NotPrimaryExpr(); // But otherwise, they are not.
4392
4393 auto MangleAlignofSizeofArg = [&] {
4394 if (SAE->isArgumentType()) {
4395 Out << 't';
4396 mangleType(SAE->getArgumentType());
4397 } else {
4398 Out << 'z';
4399 mangleExpression(SAE->getArgumentExpr());
4400 }
4401 };
4402
4403 switch(SAE->getKind()) {
4404 case UETT_SizeOf:
4405 Out << 's';
4406 MangleAlignofSizeofArg();
4407 break;
4408 case UETT_PreferredAlignOf:
4409 // As of clang 12, we mangle __alignof__ differently than alignof. (They
4410 // have acted differently since Clang 8, but were previously mangled the
4411 // same.)
4412 if (Context.getASTContext().getLangOpts().getClangABICompat() >
4413 LangOptions::ClangABI::Ver11) {
4414 Out << "u11__alignof__";
4415 if (SAE->isArgumentType())
4416 mangleType(SAE->getArgumentType());
4417 else
4418 mangleTemplateArgExpr(SAE->getArgumentExpr());
4419 Out << 'E';
4420 break;
4421 }
4422 LLVM_FALLTHROUGH;
4423 case UETT_AlignOf:
4424 Out << 'a';
4425 MangleAlignofSizeofArg();
4426 break;
4427 case UETT_VecStep: {
4428 DiagnosticsEngine &Diags = Context.getDiags();
4429 unsigned DiagID = Diags.getCustomDiagID(DiagnosticsEngine::Error,
4430 "cannot yet mangle vec_step expression");
4431 Diags.Report(DiagID);
4432 return;
4433 }
4434 case UETT_OpenMPRequiredSimdAlign: {
4435 DiagnosticsEngine &Diags = Context.getDiags();
4436 unsigned DiagID = Diags.getCustomDiagID(
4437 DiagnosticsEngine::Error,
4438 "cannot yet mangle __builtin_omp_required_simd_align expression");
4439 Diags.Report(DiagID);
4440 return;
4441 }
4442 }
4443 break;
4444 }
4445
4446 case Expr::CXXThrowExprClass: {
4447 NotPrimaryExpr();
4448 const CXXThrowExpr *TE = cast<CXXThrowExpr>(E);
4449 // <expression> ::= tw <expression> # throw expression
4450 // ::= tr # rethrow
4451 if (TE->getSubExpr()) {
4452 Out << "tw";
4453 mangleExpression(TE->getSubExpr());
4454 } else {
4455 Out << "tr";
4456 }
4457 break;
4458 }
4459
4460 case Expr::CXXTypeidExprClass: {
4461 NotPrimaryExpr();
4462 const CXXTypeidExpr *TIE = cast<CXXTypeidExpr>(E);
4463 // <expression> ::= ti <type> # typeid (type)
4464 // ::= te <expression> # typeid (expression)
4465 if (TIE->isTypeOperand()) {
4466 Out << "ti";
4467 mangleType(TIE->getTypeOperand(Context.getASTContext()));
4468 } else {
4469 Out << "te";
4470 mangleExpression(TIE->getExprOperand());
4471 }
4472 break;
4473 }
4474
4475 case Expr::CXXDeleteExprClass: {
4476 NotPrimaryExpr();
4477 const CXXDeleteExpr *DE = cast<CXXDeleteExpr>(E);
4478 // <expression> ::= [gs] dl <expression> # [::] delete expr
4479 // ::= [gs] da <expression> # [::] delete [] expr
4480 if (DE->isGlobalDelete()) Out << "gs";
4481 Out << (DE->isArrayForm() ? "da" : "dl");
4482 mangleExpression(DE->getArgument());
4483 break;
4484 }
4485
4486 case Expr::UnaryOperatorClass: {
4487 NotPrimaryExpr();
4488 const UnaryOperator *UO = cast<UnaryOperator>(E);
4489 mangleOperatorName(UnaryOperator::getOverloadedOperator(UO->getOpcode()),
4490 /*Arity=*/1);
4491 mangleExpression(UO->getSubExpr());
4492 break;
4493 }
4494
4495 case Expr::ArraySubscriptExprClass: {
4496 NotPrimaryExpr();
4497 const ArraySubscriptExpr *AE = cast<ArraySubscriptExpr>(E);
4498
4499 // Array subscript is treated as a syntactically weird form of
4500 // binary operator.
4501 Out << "ix";
4502 mangleExpression(AE->getLHS());
4503 mangleExpression(AE->getRHS());
4504 break;
4505 }
4506
4507 case Expr::MatrixSubscriptExprClass: {
4508 NotPrimaryExpr();
4509 const MatrixSubscriptExpr *ME = cast<MatrixSubscriptExpr>(E);
4510 Out << "ixix";
4511 mangleExpression(ME->getBase());
4512 mangleExpression(ME->getRowIdx());
4513 mangleExpression(ME->getColumnIdx());
4514 break;
4515 }
4516
4517 case Expr::CompoundAssignOperatorClass: // fallthrough
4518 case Expr::BinaryOperatorClass: {
4519 NotPrimaryExpr();
4520 const BinaryOperator *BO = cast<BinaryOperator>(E);
4521 if (BO->getOpcode() == BO_PtrMemD)
4522 Out << "ds";
4523 else
4524 mangleOperatorName(BinaryOperator::getOverloadedOperator(BO->getOpcode()),
4525 /*Arity=*/2);
4526 mangleExpression(BO->getLHS());
4527 mangleExpression(BO->getRHS());
4528 break;
4529 }
4530
4531 case Expr::CXXRewrittenBinaryOperatorClass: {
4532 NotPrimaryExpr();
4533 // The mangled form represents the original syntax.
4534 CXXRewrittenBinaryOperator::DecomposedForm Decomposed =
4535 cast<CXXRewrittenBinaryOperator>(E)->getDecomposedForm();
4536 mangleOperatorName(BinaryOperator::getOverloadedOperator(Decomposed.Opcode),
4537 /*Arity=*/2);
4538 mangleExpression(Decomposed.LHS);
4539 mangleExpression(Decomposed.RHS);
4540 break;
4541 }
4542
4543 case Expr::ConditionalOperatorClass: {
4544 NotPrimaryExpr();
4545 const ConditionalOperator *CO = cast<ConditionalOperator>(E);
4546 mangleOperatorName(OO_Conditional, /*Arity=*/3);
4547 mangleExpression(CO->getCond());
4548 mangleExpression(CO->getLHS(), Arity);
4549 mangleExpression(CO->getRHS(), Arity);
4550 break;
4551 }
4552
4553 case Expr::ImplicitCastExprClass: {
4554 ImplicitlyConvertedToType = E->getType();
4555 E = cast<ImplicitCastExpr>(E)->getSubExpr();
4556 goto recurse;
4557 }
4558
4559 case Expr::ObjCBridgedCastExprClass: {
4560 NotPrimaryExpr();
4561 // Mangle ownership casts as a vendor extended operator __bridge,
4562 // __bridge_transfer, or __bridge_retain.
4563 StringRef Kind = cast<ObjCBridgedCastExpr>(E)->getBridgeKindName();
4564 Out << "v1U" << Kind.size() << Kind;
4565 mangleCastExpression(E, "cv");
4566 break;
4567 }
4568
4569 case Expr::CStyleCastExprClass:
4570 NotPrimaryExpr();
4571 mangleCastExpression(E, "cv");
4572 break;
4573
4574 case Expr::CXXFunctionalCastExprClass: {
4575 NotPrimaryExpr();
4576 auto *Sub = cast<ExplicitCastExpr>(E)->getSubExpr()->IgnoreImplicit();
4577 // FIXME: Add isImplicit to CXXConstructExpr.
4578 if (auto *CCE = dyn_cast<CXXConstructExpr>(Sub))
4579 if (CCE->getParenOrBraceRange().isInvalid())
4580 Sub = CCE->getArg(0)->IgnoreImplicit();
4581 if (auto *StdInitList = dyn_cast<CXXStdInitializerListExpr>(Sub))
4582 Sub = StdInitList->getSubExpr()->IgnoreImplicit();
4583 if (auto *IL = dyn_cast<InitListExpr>(Sub)) {
4584 Out << "tl";
4585 mangleType(E->getType());
4586 mangleInitListElements(IL);
4587 Out << "E";
4588 } else {
4589 mangleCastExpression(E, "cv");
4590 }
4591 break;
4592 }
4593
4594 case Expr::CXXStaticCastExprClass:
4595 NotPrimaryExpr();
4596 mangleCastExpression(E, "sc");
4597 break;
4598 case Expr::CXXDynamicCastExprClass:
4599 NotPrimaryExpr();
4600 mangleCastExpression(E, "dc");
4601 break;
4602 case Expr::CXXReinterpretCastExprClass:
4603 NotPrimaryExpr();
4604 mangleCastExpression(E, "rc");
4605 break;
4606 case Expr::CXXConstCastExprClass:
4607 NotPrimaryExpr();
4608 mangleCastExpression(E, "cc");
4609 break;
4610 case Expr::CXXAddrspaceCastExprClass:
4611 NotPrimaryExpr();
4612 mangleCastExpression(E, "ac");
4613 break;
4614
4615 case Expr::CXXOperatorCallExprClass: {
4616 NotPrimaryExpr();
4617 const CXXOperatorCallExpr *CE = cast<CXXOperatorCallExpr>(E);
4618 unsigned NumArgs = CE->getNumArgs();
4619 // A CXXOperatorCallExpr for OO_Arrow models only semantics, not syntax
4620 // (the enclosing MemberExpr covers the syntactic portion).
4621 if (CE->getOperator() != OO_Arrow)
4622 mangleOperatorName(CE->getOperator(), /*Arity=*/NumArgs);
4623 // Mangle the arguments.
4624 for (unsigned i = 0; i != NumArgs; ++i)
4625 mangleExpression(CE->getArg(i));
4626 break;
4627 }
4628
4629 case Expr::ParenExprClass:
4630 E = cast<ParenExpr>(E)->getSubExpr();
4631 goto recurse;
4632
4633 case Expr::ConceptSpecializationExprClass: {
4634 // <expr-primary> ::= L <mangled-name> E # external name
4635 Out << "L_Z";
4636 auto *CSE = cast<ConceptSpecializationExpr>(E);
4637 mangleTemplateName(CSE->getNamedConcept(),
4638 CSE->getTemplateArguments().data(),
4639 CSE->getTemplateArguments().size());
4640 Out << 'E';
4641 break;
4642 }
4643
4644 case Expr::DeclRefExprClass:
4645 // MangleDeclRefExpr helper handles primary-vs-nonprimary
4646 MangleDeclRefExpr(cast<DeclRefExpr>(E)->getDecl());
4647 break;
4648
4649 case Expr::SubstNonTypeTemplateParmPackExprClass:
4650 NotPrimaryExpr();
4651 // FIXME: not clear how to mangle this!
4652 // template <unsigned N...> class A {
4653 // template <class U...> void foo(U (&x)[N]...);
4654 // };
4655 Out << "_SUBSTPACK_";
4656 break;
4657
4658 case Expr::FunctionParmPackExprClass: {
4659 NotPrimaryExpr();
4660 // FIXME: not clear how to mangle this!
4661 const FunctionParmPackExpr *FPPE = cast<FunctionParmPackExpr>(E);
4662 Out << "v110_SUBSTPACK";
4663 MangleDeclRefExpr(FPPE->getParameterPack());
4664 break;
4665 }
4666
4667 case Expr::DependentScopeDeclRefExprClass: {
4668 NotPrimaryExpr();
4669 const DependentScopeDeclRefExpr *DRE = cast<DependentScopeDeclRefExpr>(E);
4670 mangleUnresolvedName(DRE->getQualifier(), DRE->getDeclName(),
4671 DRE->getTemplateArgs(), DRE->getNumTemplateArgs(),
4672 Arity);
4673 break;
4674 }
4675
4676 case Expr::CXXBindTemporaryExprClass:
4677 E = cast<CXXBindTemporaryExpr>(E)->getSubExpr();
4678 goto recurse;
4679
4680 case Expr::ExprWithCleanupsClass:
4681 E = cast<ExprWithCleanups>(E)->getSubExpr();
4682 goto recurse;
4683
4684 case Expr::FloatingLiteralClass: {
4685 // <expr-primary>
4686 const FloatingLiteral *FL = cast<FloatingLiteral>(E);
4687 mangleFloatLiteral(FL->getType(), FL->getValue());
4688 break;
4689 }
4690
4691 case Expr::FixedPointLiteralClass:
4692 // Currently unimplemented -- might be <expr-primary> in future?
4693 mangleFixedPointLiteral();
4694 break;
4695
4696 case Expr::CharacterLiteralClass:
4697 // <expr-primary>
4698 Out << 'L';
4699 mangleType(E->getType());
4700 Out << cast<CharacterLiteral>(E)->getValue();
4701 Out << 'E';
4702 break;
4703
4704 // FIXME. __objc_yes/__objc_no are mangled same as true/false
4705 case Expr::ObjCBoolLiteralExprClass:
4706 // <expr-primary>
4707 Out << "Lb";
4708 Out << (cast<ObjCBoolLiteralExpr>(E)->getValue() ? '1' : '0');
4709 Out << 'E';
4710 break;
4711
4712 case Expr::CXXBoolLiteralExprClass:
4713 // <expr-primary>
4714 Out << "Lb";
4715 Out << (cast<CXXBoolLiteralExpr>(E)->getValue() ? '1' : '0');
4716 Out << 'E';
4717 break;
4718
4719 case Expr::IntegerLiteralClass: {
4720 // <expr-primary>
4721 llvm::APSInt Value(cast<IntegerLiteral>(E)->getValue());
4722 if (E->getType()->isSignedIntegerType())
4723 Value.setIsSigned(true);
4724 mangleIntegerLiteral(E->getType(), Value);
4725 break;
4726 }
4727
4728 case Expr::ImaginaryLiteralClass: {
4729 // <expr-primary>
4730 const ImaginaryLiteral *IE = cast<ImaginaryLiteral>(E);
4731 // Mangle as if a complex literal.
4732 // Proposal from David Vandevoorde, 2010.06.30.
4733 Out << 'L';
4734 mangleType(E->getType());
4735 if (const FloatingLiteral *Imag =
4736 dyn_cast<FloatingLiteral>(IE->getSubExpr())) {
4737 // Mangle a floating-point zero of the appropriate type.
4738 mangleFloat(llvm::APFloat(Imag->getValue().getSemantics()));
4739 Out << '_';
4740 mangleFloat(Imag->getValue());
4741 } else {
4742 Out << "0_";
4743 llvm::APSInt Value(cast<IntegerLiteral>(IE->getSubExpr())->getValue());
4744 if (IE->getSubExpr()->getType()->isSignedIntegerType())
4745 Value.setIsSigned(true);
4746 mangleNumber(Value);
4747 }
4748 Out << 'E';
4749 break;
4750 }
4751
4752 case Expr::StringLiteralClass: {
4753 // <expr-primary>
4754 // Revised proposal from David Vandervoorde, 2010.07.15.
4755 Out << 'L';
4756 assert(isa<ConstantArrayType>(E->getType()));
4757 mangleType(E->getType());
4758 Out << 'E';
4759 break;
4760 }
4761
4762 case Expr::GNUNullExprClass:
4763 // <expr-primary>
4764 // Mangle as if an integer literal 0.
4765 mangleIntegerLiteral(E->getType(), llvm::APSInt(32));
4766 break;
4767
4768 case Expr::CXXNullPtrLiteralExprClass: {
4769 // <expr-primary>
4770 Out << "LDnE";
4771 break;
4772 }
4773
4774 case Expr::PackExpansionExprClass:
4775 NotPrimaryExpr();
4776 Out << "sp";
4777 mangleExpression(cast<PackExpansionExpr>(E)->getPattern());
4778 break;
4779
4780 case Expr::SizeOfPackExprClass: {
4781 NotPrimaryExpr();
4782 auto *SPE = cast<SizeOfPackExpr>(E);
4783 if (SPE->isPartiallySubstituted()) {
4784 Out << "sP";
4785 for (const auto &A : SPE->getPartialArguments())
4786 mangleTemplateArg(A, false);
4787 Out << "E";
4788 break;
4789 }
4790
4791 Out << "sZ";
4792 const NamedDecl *Pack = SPE->getPack();
4793 if (const TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(Pack))
4794 mangleTemplateParameter(TTP->getDepth(), TTP->getIndex());
4795 else if (const NonTypeTemplateParmDecl *NTTP
4796 = dyn_cast<NonTypeTemplateParmDecl>(Pack))
4797 mangleTemplateParameter(NTTP->getDepth(), NTTP->getIndex());
4798 else if (const TemplateTemplateParmDecl *TempTP
4799 = dyn_cast<TemplateTemplateParmDecl>(Pack))
4800 mangleTemplateParameter(TempTP->getDepth(), TempTP->getIndex());
4801 else
4802 mangleFunctionParam(cast<ParmVarDecl>(Pack));
4803 break;
4804 }
4805
4806 case Expr::MaterializeTemporaryExprClass:
4807 E = cast<MaterializeTemporaryExpr>(E)->getSubExpr();
4808 goto recurse;
4809
4810 case Expr::CXXFoldExprClass: {
4811 NotPrimaryExpr();
4812 auto *FE = cast<CXXFoldExpr>(E);
4813 if (FE->isLeftFold())
4814 Out << (FE->getInit() ? "fL" : "fl");
4815 else
4816 Out << (FE->getInit() ? "fR" : "fr");
4817
4818 if (FE->getOperator() == BO_PtrMemD)
4819 Out << "ds";
4820 else
4821 mangleOperatorName(
4822 BinaryOperator::getOverloadedOperator(FE->getOperator()),
4823 /*Arity=*/2);
4824
4825 if (FE->getLHS())
4826 mangleExpression(FE->getLHS());
4827 if (FE->getRHS())
4828 mangleExpression(FE->getRHS());
4829 break;
4830 }
4831
4832 case Expr::CXXThisExprClass:
4833 NotPrimaryExpr();
4834 Out << "fpT";
4835 break;
4836
4837 case Expr::CoawaitExprClass:
4838 // FIXME: Propose a non-vendor mangling.
4839 NotPrimaryExpr();
4840 Out << "v18co_await";
4841 mangleExpression(cast<CoawaitExpr>(E)->getOperand());
4842 break;
4843
4844 case Expr::DependentCoawaitExprClass:
4845 // FIXME: Propose a non-vendor mangling.
4846 NotPrimaryExpr();
4847 Out << "v18co_await";
4848 mangleExpression(cast<DependentCoawaitExpr>(E)->getOperand());
4849 break;
4850
4851 case Expr::CoyieldExprClass:
4852 // FIXME: Propose a non-vendor mangling.
4853 NotPrimaryExpr();
4854 Out << "v18co_yield";
4855 mangleExpression(cast<CoawaitExpr>(E)->getOperand());
4856 break;
4857 }
4858
4859 if (AsTemplateArg && !IsPrimaryExpr)
4860 Out << 'E';
4861 }
4862
4863 /// Mangle an expression which refers to a parameter variable.
4864 ///
4865 /// <expression> ::= <function-param>
4866 /// <function-param> ::= fp <top-level CV-qualifiers> _ # L == 0, I == 0
4867 /// <function-param> ::= fp <top-level CV-qualifiers>
4868 /// <parameter-2 non-negative number> _ # L == 0, I > 0
4869 /// <function-param> ::= fL <L-1 non-negative number>
4870 /// p <top-level CV-qualifiers> _ # L > 0, I == 0
4871 /// <function-param> ::= fL <L-1 non-negative number>
4872 /// p <top-level CV-qualifiers>
4873 /// <I-1 non-negative number> _ # L > 0, I > 0
4874 ///
4875 /// L is the nesting depth of the parameter, defined as 1 if the
4876 /// parameter comes from the innermost function prototype scope
4877 /// enclosing the current context, 2 if from the next enclosing
4878 /// function prototype scope, and so on, with one special case: if
4879 /// we've processed the full parameter clause for the innermost
4880 /// function type, then L is one less. This definition conveniently
4881 /// makes it irrelevant whether a function's result type was written
4882 /// trailing or leading, but is otherwise overly complicated; the
4883 /// numbering was first designed without considering references to
4884 /// parameter in locations other than return types, and then the
4885 /// mangling had to be generalized without changing the existing
4886 /// manglings.
4887 ///
4888 /// I is the zero-based index of the parameter within its parameter
4889 /// declaration clause. Note that the original ABI document describes
4890 /// this using 1-based ordinals.
mangleFunctionParam(const ParmVarDecl * parm)4891 void CXXNameMangler::mangleFunctionParam(const ParmVarDecl *parm) {
4892 unsigned parmDepth = parm->getFunctionScopeDepth();
4893 unsigned parmIndex = parm->getFunctionScopeIndex();
4894
4895 // Compute 'L'.
4896 // parmDepth does not include the declaring function prototype.
4897 // FunctionTypeDepth does account for that.
4898 assert(parmDepth < FunctionTypeDepth.getDepth());
4899 unsigned nestingDepth = FunctionTypeDepth.getDepth() - parmDepth;
4900 if (FunctionTypeDepth.isInResultType())
4901 nestingDepth--;
4902
4903 if (nestingDepth == 0) {
4904 Out << "fp";
4905 } else {
4906 Out << "fL" << (nestingDepth - 1) << 'p';
4907 }
4908
4909 // Top-level qualifiers. We don't have to worry about arrays here,
4910 // because parameters declared as arrays should already have been
4911 // transformed to have pointer type. FIXME: apparently these don't
4912 // get mangled if used as an rvalue of a known non-class type?
4913 assert(!parm->getType()->isArrayType()
4914 && "parameter's type is still an array type?");
4915
4916 if (const DependentAddressSpaceType *DAST =
4917 dyn_cast<DependentAddressSpaceType>(parm->getType())) {
4918 mangleQualifiers(DAST->getPointeeType().getQualifiers(), DAST);
4919 } else {
4920 mangleQualifiers(parm->getType().getQualifiers());
4921 }
4922
4923 // Parameter index.
4924 if (parmIndex != 0) {
4925 Out << (parmIndex - 1);
4926 }
4927 Out << '_';
4928 }
4929
mangleCXXCtorType(CXXCtorType T,const CXXRecordDecl * InheritedFrom)4930 void CXXNameMangler::mangleCXXCtorType(CXXCtorType T,
4931 const CXXRecordDecl *InheritedFrom) {
4932 // <ctor-dtor-name> ::= C1 # complete object constructor
4933 // ::= C2 # base object constructor
4934 // ::= CI1 <type> # complete inheriting constructor
4935 // ::= CI2 <type> # base inheriting constructor
4936 //
4937 // In addition, C5 is a comdat name with C1 and C2 in it.
4938 Out << 'C';
4939 if (InheritedFrom)
4940 Out << 'I';
4941 switch (T) {
4942 case Ctor_Complete:
4943 Out << '1';
4944 break;
4945 case Ctor_Base:
4946 Out << '2';
4947 break;
4948 case Ctor_Comdat:
4949 Out << '5';
4950 break;
4951 case Ctor_DefaultClosure:
4952 case Ctor_CopyingClosure:
4953 llvm_unreachable("closure constructors don't exist for the Itanium ABI!");
4954 }
4955 if (InheritedFrom)
4956 mangleName(InheritedFrom);
4957 }
4958
mangleCXXDtorType(CXXDtorType T)4959 void CXXNameMangler::mangleCXXDtorType(CXXDtorType T) {
4960 // <ctor-dtor-name> ::= D0 # deleting destructor
4961 // ::= D1 # complete object destructor
4962 // ::= D2 # base object destructor
4963 //
4964 // In addition, D5 is a comdat name with D1, D2 and, if virtual, D0 in it.
4965 switch (T) {
4966 case Dtor_Deleting:
4967 Out << "D0";
4968 break;
4969 case Dtor_Complete:
4970 Out << "D1";
4971 break;
4972 case Dtor_Base:
4973 Out << "D2";
4974 break;
4975 case Dtor_Comdat:
4976 Out << "D5";
4977 break;
4978 }
4979 }
4980
4981 namespace {
4982 // Helper to provide ancillary information on a template used to mangle its
4983 // arguments.
4984 struct TemplateArgManglingInfo {
4985 TemplateDecl *ResolvedTemplate = nullptr;
4986 bool SeenPackExpansionIntoNonPack = false;
4987 const NamedDecl *UnresolvedExpandedPack = nullptr;
4988
TemplateArgManglingInfo__anon5b80f8b40611::TemplateArgManglingInfo4989 TemplateArgManglingInfo(TemplateName TN) {
4990 if (TemplateDecl *TD = TN.getAsTemplateDecl())
4991 ResolvedTemplate = TD;
4992 }
4993
4994 /// Do we need to mangle template arguments with exactly correct types?
4995 ///
4996 /// This should be called exactly once for each parameter / argument pair, in
4997 /// order.
needExactType__anon5b80f8b40611::TemplateArgManglingInfo4998 bool needExactType(unsigned ParamIdx, const TemplateArgument &Arg) {
4999 // We need correct types when the template-name is unresolved or when it
5000 // names a template that is able to be overloaded.
5001 if (!ResolvedTemplate || SeenPackExpansionIntoNonPack)
5002 return true;
5003
5004 // Move to the next parameter.
5005 const NamedDecl *Param = UnresolvedExpandedPack;
5006 if (!Param) {
5007 assert(ParamIdx < ResolvedTemplate->getTemplateParameters()->size() &&
5008 "no parameter for argument");
5009 Param = ResolvedTemplate->getTemplateParameters()->getParam(ParamIdx);
5010
5011 // If we reach an expanded parameter pack whose argument isn't in pack
5012 // form, that means Sema couldn't figure out which arguments belonged to
5013 // it, because it contains a pack expansion. Track the expanded pack for
5014 // all further template arguments until we hit that pack expansion.
5015 if (Param->isParameterPack() && Arg.getKind() != TemplateArgument::Pack) {
5016 assert(getExpandedPackSize(Param) &&
5017 "failed to form pack argument for parameter pack");
5018 UnresolvedExpandedPack = Param;
5019 }
5020 }
5021
5022 // If we encounter a pack argument that is expanded into a non-pack
5023 // parameter, we can no longer track parameter / argument correspondence,
5024 // and need to use exact types from this point onwards.
5025 if (Arg.isPackExpansion() &&
5026 (!Param->isParameterPack() || UnresolvedExpandedPack)) {
5027 SeenPackExpansionIntoNonPack = true;
5028 return true;
5029 }
5030
5031 // We need exact types for function template arguments because they might be
5032 // overloaded on template parameter type. As a special case, a member
5033 // function template of a generic lambda is not overloadable.
5034 if (auto *FTD = dyn_cast<FunctionTemplateDecl>(ResolvedTemplate)) {
5035 auto *RD = dyn_cast<CXXRecordDecl>(FTD->getDeclContext());
5036 if (!RD || !RD->isGenericLambda())
5037 return true;
5038 }
5039
5040 // Otherwise, we only need a correct type if the parameter has a deduced
5041 // type.
5042 //
5043 // Note: for an expanded parameter pack, getType() returns the type prior
5044 // to expansion. We could ask for the expanded type with getExpansionType(),
5045 // but it doesn't matter because substitution and expansion don't affect
5046 // whether a deduced type appears in the type.
5047 auto *NTTP = dyn_cast<NonTypeTemplateParmDecl>(Param);
5048 return NTTP && NTTP->getType()->getContainedDeducedType();
5049 }
5050 };
5051 }
5052
mangleTemplateArgs(TemplateName TN,const TemplateArgumentLoc * TemplateArgs,unsigned NumTemplateArgs)5053 void CXXNameMangler::mangleTemplateArgs(TemplateName TN,
5054 const TemplateArgumentLoc *TemplateArgs,
5055 unsigned NumTemplateArgs) {
5056 // <template-args> ::= I <template-arg>+ E
5057 Out << 'I';
5058 TemplateArgManglingInfo Info(TN);
5059 for (unsigned i = 0; i != NumTemplateArgs; ++i)
5060 mangleTemplateArg(TemplateArgs[i].getArgument(),
5061 Info.needExactType(i, TemplateArgs[i].getArgument()));
5062 Out << 'E';
5063 }
5064
mangleTemplateArgs(TemplateName TN,const TemplateArgumentList & AL)5065 void CXXNameMangler::mangleTemplateArgs(TemplateName TN,
5066 const TemplateArgumentList &AL) {
5067 // <template-args> ::= I <template-arg>+ E
5068 Out << 'I';
5069 TemplateArgManglingInfo Info(TN);
5070 for (unsigned i = 0, e = AL.size(); i != e; ++i)
5071 mangleTemplateArg(AL[i], Info.needExactType(i, AL[i]));
5072 Out << 'E';
5073 }
5074
mangleTemplateArgs(TemplateName TN,const TemplateArgument * TemplateArgs,unsigned NumTemplateArgs)5075 void CXXNameMangler::mangleTemplateArgs(TemplateName TN,
5076 const TemplateArgument *TemplateArgs,
5077 unsigned NumTemplateArgs) {
5078 // <template-args> ::= I <template-arg>+ E
5079 Out << 'I';
5080 TemplateArgManglingInfo Info(TN);
5081 for (unsigned i = 0; i != NumTemplateArgs; ++i)
5082 mangleTemplateArg(TemplateArgs[i], Info.needExactType(i, TemplateArgs[i]));
5083 Out << 'E';
5084 }
5085
mangleTemplateArg(TemplateArgument A,bool NeedExactType)5086 void CXXNameMangler::mangleTemplateArg(TemplateArgument A, bool NeedExactType) {
5087 // <template-arg> ::= <type> # type or template
5088 // ::= X <expression> E # expression
5089 // ::= <expr-primary> # simple expressions
5090 // ::= J <template-arg>* E # argument pack
5091 if (!A.isInstantiationDependent() || A.isDependent())
5092 A = Context.getASTContext().getCanonicalTemplateArgument(A);
5093
5094 switch (A.getKind()) {
5095 case TemplateArgument::Null:
5096 llvm_unreachable("Cannot mangle NULL template argument");
5097
5098 case TemplateArgument::Type:
5099 mangleType(A.getAsType());
5100 break;
5101 case TemplateArgument::Template:
5102 // This is mangled as <type>.
5103 mangleType(A.getAsTemplate());
5104 break;
5105 case TemplateArgument::TemplateExpansion:
5106 // <type> ::= Dp <type> # pack expansion (C++0x)
5107 Out << "Dp";
5108 mangleType(A.getAsTemplateOrTemplatePattern());
5109 break;
5110 case TemplateArgument::Expression:
5111 mangleTemplateArgExpr(A.getAsExpr());
5112 break;
5113 case TemplateArgument::Integral:
5114 mangleIntegerLiteral(A.getIntegralType(), A.getAsIntegral());
5115 break;
5116 case TemplateArgument::Declaration: {
5117 // <expr-primary> ::= L <mangled-name> E # external name
5118 ValueDecl *D = A.getAsDecl();
5119
5120 // Template parameter objects are modeled by reproducing a source form
5121 // produced as if by aggregate initialization.
5122 if (A.getParamTypeForDecl()->isRecordType()) {
5123 auto *TPO = cast<TemplateParamObjectDecl>(D);
5124 mangleValueInTemplateArg(TPO->getType().getUnqualifiedType(),
5125 TPO->getValue(), /*TopLevel=*/true,
5126 NeedExactType);
5127 break;
5128 }
5129
5130 ASTContext &Ctx = Context.getASTContext();
5131 APValue Value;
5132 if (D->isCXXInstanceMember())
5133 // Simple pointer-to-member with no conversion.
5134 Value = APValue(D, /*IsDerivedMember=*/false, /*Path=*/{});
5135 else if (D->getType()->isArrayType() &&
5136 Ctx.hasSimilarType(Ctx.getDecayedType(D->getType()),
5137 A.getParamTypeForDecl()) &&
5138 Ctx.getLangOpts().getClangABICompat() >
5139 LangOptions::ClangABI::Ver11)
5140 // Build a value corresponding to this implicit array-to-pointer decay.
5141 Value = APValue(APValue::LValueBase(D), CharUnits::Zero(),
5142 {APValue::LValuePathEntry::ArrayIndex(0)},
5143 /*OnePastTheEnd=*/false);
5144 else
5145 // Regular pointer or reference to a declaration.
5146 Value = APValue(APValue::LValueBase(D), CharUnits::Zero(),
5147 ArrayRef<APValue::LValuePathEntry>(),
5148 /*OnePastTheEnd=*/false);
5149 mangleValueInTemplateArg(A.getParamTypeForDecl(), Value, /*TopLevel=*/true,
5150 NeedExactType);
5151 break;
5152 }
5153 case TemplateArgument::NullPtr: {
5154 mangleNullPointer(A.getNullPtrType());
5155 break;
5156 }
5157 case TemplateArgument::Pack: {
5158 // <template-arg> ::= J <template-arg>* E
5159 Out << 'J';
5160 for (const auto &P : A.pack_elements())
5161 mangleTemplateArg(P, NeedExactType);
5162 Out << 'E';
5163 }
5164 }
5165 }
5166
mangleTemplateArgExpr(const Expr * E)5167 void CXXNameMangler::mangleTemplateArgExpr(const Expr *E) {
5168 ASTContext &Ctx = Context.getASTContext();
5169 if (Ctx.getLangOpts().getClangABICompat() > LangOptions::ClangABI::Ver11) {
5170 mangleExpression(E, UnknownArity, /*AsTemplateArg=*/true);
5171 return;
5172 }
5173
5174 // Prior to Clang 12, we didn't omit the X .. E around <expr-primary>
5175 // correctly in cases where the template argument was
5176 // constructed from an expression rather than an already-evaluated
5177 // literal. In such a case, we would then e.g. emit 'XLi0EE' instead of
5178 // 'Li0E'.
5179 //
5180 // We did special-case DeclRefExpr to attempt to DTRT for that one
5181 // expression-kind, but while doing so, unfortunately handled ParmVarDecl
5182 // (subtype of VarDecl) _incorrectly_, and emitted 'L_Z .. E' instead of
5183 // the proper 'Xfp_E'.
5184 E = E->IgnoreParenImpCasts();
5185 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) {
5186 const ValueDecl *D = DRE->getDecl();
5187 if (isa<VarDecl>(D) || isa<FunctionDecl>(D)) {
5188 Out << 'L';
5189 mangle(D);
5190 Out << 'E';
5191 return;
5192 }
5193 }
5194 Out << 'X';
5195 mangleExpression(E);
5196 Out << 'E';
5197 }
5198
5199 /// Determine whether a given value is equivalent to zero-initialization for
5200 /// the purpose of discarding a trailing portion of a 'tl' mangling.
5201 ///
5202 /// Note that this is not in general equivalent to determining whether the
5203 /// value has an all-zeroes bit pattern.
isZeroInitialized(QualType T,const APValue & V)5204 static bool isZeroInitialized(QualType T, const APValue &V) {
5205 // FIXME: mangleValueInTemplateArg has quadratic time complexity in
5206 // pathological cases due to using this, but it's a little awkward
5207 // to do this in linear time in general.
5208 switch (V.getKind()) {
5209 case APValue::None:
5210 case APValue::Indeterminate:
5211 case APValue::AddrLabelDiff:
5212 return false;
5213
5214 case APValue::Struct: {
5215 const CXXRecordDecl *RD = T->getAsCXXRecordDecl();
5216 assert(RD && "unexpected type for record value");
5217 unsigned I = 0;
5218 for (const CXXBaseSpecifier &BS : RD->bases()) {
5219 if (!isZeroInitialized(BS.getType(), V.getStructBase(I)))
5220 return false;
5221 ++I;
5222 }
5223 I = 0;
5224 for (const FieldDecl *FD : RD->fields()) {
5225 if (!FD->isUnnamedBitfield() &&
5226 !isZeroInitialized(FD->getType(), V.getStructField(I)))
5227 return false;
5228 ++I;
5229 }
5230 return true;
5231 }
5232
5233 case APValue::Union: {
5234 const CXXRecordDecl *RD = T->getAsCXXRecordDecl();
5235 assert(RD && "unexpected type for union value");
5236 // Zero-initialization zeroes the first non-unnamed-bitfield field, if any.
5237 for (const FieldDecl *FD : RD->fields()) {
5238 if (!FD->isUnnamedBitfield())
5239 return V.getUnionField() && declaresSameEntity(FD, V.getUnionField()) &&
5240 isZeroInitialized(FD->getType(), V.getUnionValue());
5241 }
5242 // If there are no fields (other than unnamed bitfields), the value is
5243 // necessarily zero-initialized.
5244 return true;
5245 }
5246
5247 case APValue::Array: {
5248 QualType ElemT(T->getArrayElementTypeNoTypeQual(), 0);
5249 for (unsigned I = 0, N = V.getArrayInitializedElts(); I != N; ++I)
5250 if (!isZeroInitialized(ElemT, V.getArrayInitializedElt(I)))
5251 return false;
5252 return !V.hasArrayFiller() || isZeroInitialized(ElemT, V.getArrayFiller());
5253 }
5254
5255 case APValue::Vector: {
5256 const VectorType *VT = T->castAs<VectorType>();
5257 for (unsigned I = 0, N = V.getVectorLength(); I != N; ++I)
5258 if (!isZeroInitialized(VT->getElementType(), V.getVectorElt(I)))
5259 return false;
5260 return true;
5261 }
5262
5263 case APValue::Int:
5264 return !V.getInt();
5265
5266 case APValue::Float:
5267 return V.getFloat().isPosZero();
5268
5269 case APValue::FixedPoint:
5270 return !V.getFixedPoint().getValue();
5271
5272 case APValue::ComplexFloat:
5273 return V.getComplexFloatReal().isPosZero() &&
5274 V.getComplexFloatImag().isPosZero();
5275
5276 case APValue::ComplexInt:
5277 return !V.getComplexIntReal() && !V.getComplexIntImag();
5278
5279 case APValue::LValue:
5280 return V.isNullPointer();
5281
5282 case APValue::MemberPointer:
5283 return !V.getMemberPointerDecl();
5284 }
5285
5286 llvm_unreachable("Unhandled APValue::ValueKind enum");
5287 }
5288
getLValueType(ASTContext & Ctx,const APValue & LV)5289 static QualType getLValueType(ASTContext &Ctx, const APValue &LV) {
5290 QualType T = LV.getLValueBase().getType();
5291 for (APValue::LValuePathEntry E : LV.getLValuePath()) {
5292 if (const ArrayType *AT = Ctx.getAsArrayType(T))
5293 T = AT->getElementType();
5294 else if (const FieldDecl *FD =
5295 dyn_cast<FieldDecl>(E.getAsBaseOrMember().getPointer()))
5296 T = FD->getType();
5297 else
5298 T = Ctx.getRecordType(
5299 cast<CXXRecordDecl>(E.getAsBaseOrMember().getPointer()));
5300 }
5301 return T;
5302 }
5303
mangleValueInTemplateArg(QualType T,const APValue & V,bool TopLevel,bool NeedExactType)5304 void CXXNameMangler::mangleValueInTemplateArg(QualType T, const APValue &V,
5305 bool TopLevel,
5306 bool NeedExactType) {
5307 // Ignore all top-level cv-qualifiers, to match GCC.
5308 Qualifiers Quals;
5309 T = getASTContext().getUnqualifiedArrayType(T, Quals);
5310
5311 // A top-level expression that's not a primary expression is wrapped in X...E.
5312 bool IsPrimaryExpr = true;
5313 auto NotPrimaryExpr = [&] {
5314 if (TopLevel && IsPrimaryExpr)
5315 Out << 'X';
5316 IsPrimaryExpr = false;
5317 };
5318
5319 // Proposed in https://github.com/itanium-cxx-abi/cxx-abi/issues/63.
5320 switch (V.getKind()) {
5321 case APValue::None:
5322 case APValue::Indeterminate:
5323 Out << 'L';
5324 mangleType(T);
5325 Out << 'E';
5326 break;
5327
5328 case APValue::AddrLabelDiff:
5329 llvm_unreachable("unexpected value kind in template argument");
5330
5331 case APValue::Struct: {
5332 const CXXRecordDecl *RD = T->getAsCXXRecordDecl();
5333 assert(RD && "unexpected type for record value");
5334
5335 // Drop trailing zero-initialized elements.
5336 llvm::SmallVector<const FieldDecl *, 16> Fields(RD->field_begin(),
5337 RD->field_end());
5338 while (
5339 !Fields.empty() &&
5340 (Fields.back()->isUnnamedBitfield() ||
5341 isZeroInitialized(Fields.back()->getType(),
5342 V.getStructField(Fields.back()->getFieldIndex())))) {
5343 Fields.pop_back();
5344 }
5345 llvm::ArrayRef<CXXBaseSpecifier> Bases(RD->bases_begin(), RD->bases_end());
5346 if (Fields.empty()) {
5347 while (!Bases.empty() &&
5348 isZeroInitialized(Bases.back().getType(),
5349 V.getStructBase(Bases.size() - 1)))
5350 Bases = Bases.drop_back();
5351 }
5352
5353 // <expression> ::= tl <type> <braced-expression>* E
5354 NotPrimaryExpr();
5355 Out << "tl";
5356 mangleType(T);
5357 for (unsigned I = 0, N = Bases.size(); I != N; ++I)
5358 mangleValueInTemplateArg(Bases[I].getType(), V.getStructBase(I), false);
5359 for (unsigned I = 0, N = Fields.size(); I != N; ++I) {
5360 if (Fields[I]->isUnnamedBitfield())
5361 continue;
5362 mangleValueInTemplateArg(Fields[I]->getType(),
5363 V.getStructField(Fields[I]->getFieldIndex()),
5364 false);
5365 }
5366 Out << 'E';
5367 break;
5368 }
5369
5370 case APValue::Union: {
5371 assert(T->getAsCXXRecordDecl() && "unexpected type for union value");
5372 const FieldDecl *FD = V.getUnionField();
5373
5374 if (!FD) {
5375 Out << 'L';
5376 mangleType(T);
5377 Out << 'E';
5378 break;
5379 }
5380
5381 // <braced-expression> ::= di <field source-name> <braced-expression>
5382 NotPrimaryExpr();
5383 Out << "tl";
5384 mangleType(T);
5385 if (!isZeroInitialized(T, V)) {
5386 Out << "di";
5387 mangleSourceName(FD->getIdentifier());
5388 mangleValueInTemplateArg(FD->getType(), V.getUnionValue(), false);
5389 }
5390 Out << 'E';
5391 break;
5392 }
5393
5394 case APValue::Array: {
5395 QualType ElemT(T->getArrayElementTypeNoTypeQual(), 0);
5396
5397 NotPrimaryExpr();
5398 Out << "tl";
5399 mangleType(T);
5400
5401 // Drop trailing zero-initialized elements.
5402 unsigned N = V.getArraySize();
5403 if (!V.hasArrayFiller() || isZeroInitialized(ElemT, V.getArrayFiller())) {
5404 N = V.getArrayInitializedElts();
5405 while (N && isZeroInitialized(ElemT, V.getArrayInitializedElt(N - 1)))
5406 --N;
5407 }
5408
5409 for (unsigned I = 0; I != N; ++I) {
5410 const APValue &Elem = I < V.getArrayInitializedElts()
5411 ? V.getArrayInitializedElt(I)
5412 : V.getArrayFiller();
5413 mangleValueInTemplateArg(ElemT, Elem, false);
5414 }
5415 Out << 'E';
5416 break;
5417 }
5418
5419 case APValue::Vector: {
5420 const VectorType *VT = T->castAs<VectorType>();
5421
5422 NotPrimaryExpr();
5423 Out << "tl";
5424 mangleType(T);
5425 unsigned N = V.getVectorLength();
5426 while (N && isZeroInitialized(VT->getElementType(), V.getVectorElt(N - 1)))
5427 --N;
5428 for (unsigned I = 0; I != N; ++I)
5429 mangleValueInTemplateArg(VT->getElementType(), V.getVectorElt(I), false);
5430 Out << 'E';
5431 break;
5432 }
5433
5434 case APValue::Int:
5435 mangleIntegerLiteral(T, V.getInt());
5436 break;
5437
5438 case APValue::Float:
5439 mangleFloatLiteral(T, V.getFloat());
5440 break;
5441
5442 case APValue::FixedPoint:
5443 mangleFixedPointLiteral();
5444 break;
5445
5446 case APValue::ComplexFloat: {
5447 const ComplexType *CT = T->castAs<ComplexType>();
5448 NotPrimaryExpr();
5449 Out << "tl";
5450 mangleType(T);
5451 if (!V.getComplexFloatReal().isPosZero() ||
5452 !V.getComplexFloatImag().isPosZero())
5453 mangleFloatLiteral(CT->getElementType(), V.getComplexFloatReal());
5454 if (!V.getComplexFloatImag().isPosZero())
5455 mangleFloatLiteral(CT->getElementType(), V.getComplexFloatImag());
5456 Out << 'E';
5457 break;
5458 }
5459
5460 case APValue::ComplexInt: {
5461 const ComplexType *CT = T->castAs<ComplexType>();
5462 NotPrimaryExpr();
5463 Out << "tl";
5464 mangleType(T);
5465 if (V.getComplexIntReal().getBoolValue() ||
5466 V.getComplexIntImag().getBoolValue())
5467 mangleIntegerLiteral(CT->getElementType(), V.getComplexIntReal());
5468 if (V.getComplexIntImag().getBoolValue())
5469 mangleIntegerLiteral(CT->getElementType(), V.getComplexIntImag());
5470 Out << 'E';
5471 break;
5472 }
5473
5474 case APValue::LValue: {
5475 // Proposed in https://github.com/itanium-cxx-abi/cxx-abi/issues/47.
5476 assert((T->isPointerType() || T->isReferenceType()) &&
5477 "unexpected type for LValue template arg");
5478
5479 if (V.isNullPointer()) {
5480 mangleNullPointer(T);
5481 break;
5482 }
5483
5484 APValue::LValueBase B = V.getLValueBase();
5485 if (!B) {
5486 // Non-standard mangling for integer cast to a pointer; this can only
5487 // occur as an extension.
5488 CharUnits Offset = V.getLValueOffset();
5489 if (Offset.isZero()) {
5490 // This is reinterpret_cast<T*>(0), not a null pointer. Mangle this as
5491 // a cast, because L <type> 0 E means something else.
5492 NotPrimaryExpr();
5493 Out << "rc";
5494 mangleType(T);
5495 Out << "Li0E";
5496 if (TopLevel)
5497 Out << 'E';
5498 } else {
5499 Out << "L";
5500 mangleType(T);
5501 Out << Offset.getQuantity() << 'E';
5502 }
5503 break;
5504 }
5505
5506 ASTContext &Ctx = Context.getASTContext();
5507
5508 enum { Base, Offset, Path } Kind;
5509 if (!V.hasLValuePath()) {
5510 // Mangle as (T*)((char*)&base + N).
5511 if (T->isReferenceType()) {
5512 NotPrimaryExpr();
5513 Out << "decvP";
5514 mangleType(T->getPointeeType());
5515 } else {
5516 NotPrimaryExpr();
5517 Out << "cv";
5518 mangleType(T);
5519 }
5520 Out << "plcvPcad";
5521 Kind = Offset;
5522 } else {
5523 if (!V.getLValuePath().empty() || V.isLValueOnePastTheEnd()) {
5524 NotPrimaryExpr();
5525 // A final conversion to the template parameter's type is usually
5526 // folded into the 'so' mangling, but we can't do that for 'void*'
5527 // parameters without introducing collisions.
5528 if (NeedExactType && T->isVoidPointerType()) {
5529 Out << "cv";
5530 mangleType(T);
5531 }
5532 if (T->isPointerType())
5533 Out << "ad";
5534 Out << "so";
5535 mangleType(T->isVoidPointerType()
5536 ? getLValueType(Ctx, V).getUnqualifiedType()
5537 : T->getPointeeType());
5538 Kind = Path;
5539 } else {
5540 if (NeedExactType &&
5541 !Ctx.hasSameType(T->getPointeeType(), getLValueType(Ctx, V)) &&
5542 Ctx.getLangOpts().getClangABICompat() >
5543 LangOptions::ClangABI::Ver11) {
5544 NotPrimaryExpr();
5545 Out << "cv";
5546 mangleType(T);
5547 }
5548 if (T->isPointerType()) {
5549 NotPrimaryExpr();
5550 Out << "ad";
5551 }
5552 Kind = Base;
5553 }
5554 }
5555
5556 QualType TypeSoFar = B.getType();
5557 if (auto *VD = B.dyn_cast<const ValueDecl*>()) {
5558 Out << 'L';
5559 mangle(VD);
5560 Out << 'E';
5561 } else if (auto *E = B.dyn_cast<const Expr*>()) {
5562 NotPrimaryExpr();
5563 mangleExpression(E);
5564 } else if (auto TI = B.dyn_cast<TypeInfoLValue>()) {
5565 NotPrimaryExpr();
5566 Out << "ti";
5567 mangleType(QualType(TI.getType(), 0));
5568 } else {
5569 // We should never see dynamic allocations here.
5570 llvm_unreachable("unexpected lvalue base kind in template argument");
5571 }
5572
5573 switch (Kind) {
5574 case Base:
5575 break;
5576
5577 case Offset:
5578 Out << 'L';
5579 mangleType(Ctx.getPointerDiffType());
5580 mangleNumber(V.getLValueOffset().getQuantity());
5581 Out << 'E';
5582 break;
5583
5584 case Path:
5585 // <expression> ::= so <referent type> <expr> [<offset number>]
5586 // <union-selector>* [p] E
5587 if (!V.getLValueOffset().isZero())
5588 mangleNumber(V.getLValueOffset().getQuantity());
5589
5590 // We model a past-the-end array pointer as array indexing with index N,
5591 // not with the "past the end" flag. Compensate for that.
5592 bool OnePastTheEnd = V.isLValueOnePastTheEnd();
5593
5594 for (APValue::LValuePathEntry E : V.getLValuePath()) {
5595 if (auto *AT = TypeSoFar->getAsArrayTypeUnsafe()) {
5596 if (auto *CAT = dyn_cast<ConstantArrayType>(AT))
5597 OnePastTheEnd |= CAT->getSize() == E.getAsArrayIndex();
5598 TypeSoFar = AT->getElementType();
5599 } else {
5600 const Decl *D = E.getAsBaseOrMember().getPointer();
5601 if (auto *FD = dyn_cast<FieldDecl>(D)) {
5602 // <union-selector> ::= _ <number>
5603 if (FD->getParent()->isUnion()) {
5604 Out << '_';
5605 if (FD->getFieldIndex())
5606 Out << (FD->getFieldIndex() - 1);
5607 }
5608 TypeSoFar = FD->getType();
5609 } else {
5610 TypeSoFar = Ctx.getRecordType(cast<CXXRecordDecl>(D));
5611 }
5612 }
5613 }
5614
5615 if (OnePastTheEnd)
5616 Out << 'p';
5617 Out << 'E';
5618 break;
5619 }
5620
5621 break;
5622 }
5623
5624 case APValue::MemberPointer:
5625 // Proposed in https://github.com/itanium-cxx-abi/cxx-abi/issues/47.
5626 if (!V.getMemberPointerDecl()) {
5627 mangleNullPointer(T);
5628 break;
5629 }
5630
5631 ASTContext &Ctx = Context.getASTContext();
5632
5633 NotPrimaryExpr();
5634 if (!V.getMemberPointerPath().empty()) {
5635 Out << "mc";
5636 mangleType(T);
5637 } else if (NeedExactType &&
5638 !Ctx.hasSameType(
5639 T->castAs<MemberPointerType>()->getPointeeType(),
5640 V.getMemberPointerDecl()->getType()) &&
5641 Ctx.getLangOpts().getClangABICompat() >
5642 LangOptions::ClangABI::Ver11) {
5643 Out << "cv";
5644 mangleType(T);
5645 }
5646 Out << "adL";
5647 mangle(V.getMemberPointerDecl());
5648 Out << 'E';
5649 if (!V.getMemberPointerPath().empty()) {
5650 CharUnits Offset =
5651 Context.getASTContext().getMemberPointerPathAdjustment(V);
5652 if (!Offset.isZero())
5653 mangleNumber(Offset.getQuantity());
5654 Out << 'E';
5655 }
5656 break;
5657 }
5658
5659 if (TopLevel && !IsPrimaryExpr)
5660 Out << 'E';
5661 }
5662
mangleTemplateParameter(unsigned Depth,unsigned Index)5663 void CXXNameMangler::mangleTemplateParameter(unsigned Depth, unsigned Index) {
5664 // <template-param> ::= T_ # first template parameter
5665 // ::= T <parameter-2 non-negative number> _
5666 // ::= TL <L-1 non-negative number> __
5667 // ::= TL <L-1 non-negative number> _
5668 // <parameter-2 non-negative number> _
5669 //
5670 // The latter two manglings are from a proposal here:
5671 // https://github.com/itanium-cxx-abi/cxx-abi/issues/31#issuecomment-528122117
5672 Out << 'T';
5673 if (Depth != 0)
5674 Out << 'L' << (Depth - 1) << '_';
5675 if (Index != 0)
5676 Out << (Index - 1);
5677 Out << '_';
5678 }
5679
mangleSeqID(unsigned SeqID)5680 void CXXNameMangler::mangleSeqID(unsigned SeqID) {
5681 if (SeqID == 1)
5682 Out << '0';
5683 else if (SeqID > 1) {
5684 SeqID--;
5685
5686 // <seq-id> is encoded in base-36, using digits and upper case letters.
5687 char Buffer[7]; // log(2**32) / log(36) ~= 7
5688 MutableArrayRef<char> BufferRef(Buffer);
5689 MutableArrayRef<char>::reverse_iterator I = BufferRef.rbegin();
5690
5691 for (; SeqID != 0; SeqID /= 36) {
5692 unsigned C = SeqID % 36;
5693 *I++ = (C < 10 ? '0' + C : 'A' + C - 10);
5694 }
5695
5696 Out.write(I.base(), I - BufferRef.rbegin());
5697 }
5698 Out << '_';
5699 }
5700
mangleExistingSubstitution(TemplateName tname)5701 void CXXNameMangler::mangleExistingSubstitution(TemplateName tname) {
5702 bool result = mangleSubstitution(tname);
5703 assert(result && "no existing substitution for template name");
5704 (void) result;
5705 }
5706
5707 // <substitution> ::= S <seq-id> _
5708 // ::= S_
mangleSubstitution(const NamedDecl * ND)5709 bool CXXNameMangler::mangleSubstitution(const NamedDecl *ND) {
5710 // Try one of the standard substitutions first.
5711 if (mangleStandardSubstitution(ND))
5712 return true;
5713
5714 ND = cast<NamedDecl>(ND->getCanonicalDecl());
5715 return mangleSubstitution(reinterpret_cast<uintptr_t>(ND));
5716 }
5717
5718 /// Determine whether the given type has any qualifiers that are relevant for
5719 /// substitutions.
hasMangledSubstitutionQualifiers(QualType T)5720 static bool hasMangledSubstitutionQualifiers(QualType T) {
5721 Qualifiers Qs = T.getQualifiers();
5722 return Qs.getCVRQualifiers() || Qs.hasAddressSpace() || Qs.hasUnaligned();
5723 }
5724
mangleSubstitution(QualType T)5725 bool CXXNameMangler::mangleSubstitution(QualType T) {
5726 if (!hasMangledSubstitutionQualifiers(T)) {
5727 if (const RecordType *RT = T->getAs<RecordType>())
5728 return mangleSubstitution(RT->getDecl());
5729 }
5730
5731 uintptr_t TypePtr = reinterpret_cast<uintptr_t>(T.getAsOpaquePtr());
5732
5733 return mangleSubstitution(TypePtr);
5734 }
5735
mangleSubstitution(TemplateName Template)5736 bool CXXNameMangler::mangleSubstitution(TemplateName Template) {
5737 if (TemplateDecl *TD = Template.getAsTemplateDecl())
5738 return mangleSubstitution(TD);
5739
5740 Template = Context.getASTContext().getCanonicalTemplateName(Template);
5741 return mangleSubstitution(
5742 reinterpret_cast<uintptr_t>(Template.getAsVoidPointer()));
5743 }
5744
mangleSubstitution(uintptr_t Ptr)5745 bool CXXNameMangler::mangleSubstitution(uintptr_t Ptr) {
5746 llvm::DenseMap<uintptr_t, unsigned>::iterator I = Substitutions.find(Ptr);
5747 if (I == Substitutions.end())
5748 return false;
5749
5750 unsigned SeqID = I->second;
5751 Out << 'S';
5752 mangleSeqID(SeqID);
5753
5754 return true;
5755 }
5756
isCharType(QualType T)5757 static bool isCharType(QualType T) {
5758 if (T.isNull())
5759 return false;
5760
5761 return T->isSpecificBuiltinType(BuiltinType::Char_S) ||
5762 T->isSpecificBuiltinType(BuiltinType::Char_U);
5763 }
5764
5765 /// Returns whether a given type is a template specialization of a given name
5766 /// with a single argument of type char.
isCharSpecialization(QualType T,const char * Name)5767 static bool isCharSpecialization(QualType T, const char *Name) {
5768 if (T.isNull())
5769 return false;
5770
5771 const RecordType *RT = T->getAs<RecordType>();
5772 if (!RT)
5773 return false;
5774
5775 const ClassTemplateSpecializationDecl *SD =
5776 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl());
5777 if (!SD)
5778 return false;
5779
5780 if (!isStdNamespace(getEffectiveDeclContext(SD)))
5781 return false;
5782
5783 const TemplateArgumentList &TemplateArgs = SD->getTemplateArgs();
5784 if (TemplateArgs.size() != 1)
5785 return false;
5786
5787 if (!isCharType(TemplateArgs[0].getAsType()))
5788 return false;
5789
5790 return SD->getIdentifier()->getName() == Name;
5791 }
5792
5793 template <std::size_t StrLen>
isStreamCharSpecialization(const ClassTemplateSpecializationDecl * SD,const char (& Str)[StrLen])5794 static bool isStreamCharSpecialization(const ClassTemplateSpecializationDecl*SD,
5795 const char (&Str)[StrLen]) {
5796 if (!SD->getIdentifier()->isStr(Str))
5797 return false;
5798
5799 const TemplateArgumentList &TemplateArgs = SD->getTemplateArgs();
5800 if (TemplateArgs.size() != 2)
5801 return false;
5802
5803 if (!isCharType(TemplateArgs[0].getAsType()))
5804 return false;
5805
5806 if (!isCharSpecialization(TemplateArgs[1].getAsType(), "char_traits"))
5807 return false;
5808
5809 return true;
5810 }
5811
mangleStandardSubstitution(const NamedDecl * ND)5812 bool CXXNameMangler::mangleStandardSubstitution(const NamedDecl *ND) {
5813 // <substitution> ::= St # ::std::
5814 if (const NamespaceDecl *NS = dyn_cast<NamespaceDecl>(ND)) {
5815 if (isStd(NS)) {
5816 Out << "St";
5817 return true;
5818 }
5819 }
5820
5821 if (const ClassTemplateDecl *TD = dyn_cast<ClassTemplateDecl>(ND)) {
5822 if (!isStdNamespace(getEffectiveDeclContext(TD)))
5823 return false;
5824
5825 // <substitution> ::= Sa # ::std::allocator
5826 if (TD->getIdentifier()->isStr("allocator")) {
5827 Out << "Sa";
5828 return true;
5829 }
5830
5831 // <<substitution> ::= Sb # ::std::basic_string
5832 if (TD->getIdentifier()->isStr("basic_string")) {
5833 Out << "Sb";
5834 return true;
5835 }
5836 }
5837
5838 if (const ClassTemplateSpecializationDecl *SD =
5839 dyn_cast<ClassTemplateSpecializationDecl>(ND)) {
5840 if (!isStdNamespace(getEffectiveDeclContext(SD)))
5841 return false;
5842
5843 // <substitution> ::= Ss # ::std::basic_string<char,
5844 // ::std::char_traits<char>,
5845 // ::std::allocator<char> >
5846 if (SD->getIdentifier()->isStr("basic_string")) {
5847 const TemplateArgumentList &TemplateArgs = SD->getTemplateArgs();
5848
5849 if (TemplateArgs.size() != 3)
5850 return false;
5851
5852 if (!isCharType(TemplateArgs[0].getAsType()))
5853 return false;
5854
5855 if (!isCharSpecialization(TemplateArgs[1].getAsType(), "char_traits"))
5856 return false;
5857
5858 if (!isCharSpecialization(TemplateArgs[2].getAsType(), "allocator"))
5859 return false;
5860
5861 Out << "Ss";
5862 return true;
5863 }
5864
5865 // <substitution> ::= Si # ::std::basic_istream<char,
5866 // ::std::char_traits<char> >
5867 if (isStreamCharSpecialization(SD, "basic_istream")) {
5868 Out << "Si";
5869 return true;
5870 }
5871
5872 // <substitution> ::= So # ::std::basic_ostream<char,
5873 // ::std::char_traits<char> >
5874 if (isStreamCharSpecialization(SD, "basic_ostream")) {
5875 Out << "So";
5876 return true;
5877 }
5878
5879 // <substitution> ::= Sd # ::std::basic_iostream<char,
5880 // ::std::char_traits<char> >
5881 if (isStreamCharSpecialization(SD, "basic_iostream")) {
5882 Out << "Sd";
5883 return true;
5884 }
5885 }
5886 return false;
5887 }
5888
addSubstitution(QualType T)5889 void CXXNameMangler::addSubstitution(QualType T) {
5890 if (!hasMangledSubstitutionQualifiers(T)) {
5891 if (const RecordType *RT = T->getAs<RecordType>()) {
5892 addSubstitution(RT->getDecl());
5893 return;
5894 }
5895 }
5896
5897 uintptr_t TypePtr = reinterpret_cast<uintptr_t>(T.getAsOpaquePtr());
5898 addSubstitution(TypePtr);
5899 }
5900
addSubstitution(TemplateName Template)5901 void CXXNameMangler::addSubstitution(TemplateName Template) {
5902 if (TemplateDecl *TD = Template.getAsTemplateDecl())
5903 return addSubstitution(TD);
5904
5905 Template = Context.getASTContext().getCanonicalTemplateName(Template);
5906 addSubstitution(reinterpret_cast<uintptr_t>(Template.getAsVoidPointer()));
5907 }
5908
addSubstitution(uintptr_t Ptr)5909 void CXXNameMangler::addSubstitution(uintptr_t Ptr) {
5910 assert(!Substitutions.count(Ptr) && "Substitution already exists!");
5911 Substitutions[Ptr] = SeqID++;
5912 }
5913
extendSubstitutions(CXXNameMangler * Other)5914 void CXXNameMangler::extendSubstitutions(CXXNameMangler* Other) {
5915 assert(Other->SeqID >= SeqID && "Must be superset of substitutions!");
5916 if (Other->SeqID > SeqID) {
5917 Substitutions.swap(Other->Substitutions);
5918 SeqID = Other->SeqID;
5919 }
5920 }
5921
5922 CXXNameMangler::AbiTagList
makeFunctionReturnTypeTags(const FunctionDecl * FD)5923 CXXNameMangler::makeFunctionReturnTypeTags(const FunctionDecl *FD) {
5924 // When derived abi tags are disabled there is no need to make any list.
5925 if (DisableDerivedAbiTags)
5926 return AbiTagList();
5927
5928 llvm::raw_null_ostream NullOutStream;
5929 CXXNameMangler TrackReturnTypeTags(*this, NullOutStream);
5930 TrackReturnTypeTags.disableDerivedAbiTags();
5931
5932 const FunctionProtoType *Proto =
5933 cast<FunctionProtoType>(FD->getType()->getAs<FunctionType>());
5934 FunctionTypeDepthState saved = TrackReturnTypeTags.FunctionTypeDepth.push();
5935 TrackReturnTypeTags.FunctionTypeDepth.enterResultType();
5936 TrackReturnTypeTags.mangleType(Proto->getReturnType());
5937 TrackReturnTypeTags.FunctionTypeDepth.leaveResultType();
5938 TrackReturnTypeTags.FunctionTypeDepth.pop(saved);
5939
5940 return TrackReturnTypeTags.AbiTagsRoot.getSortedUniqueUsedAbiTags();
5941 }
5942
5943 CXXNameMangler::AbiTagList
makeVariableTypeTags(const VarDecl * VD)5944 CXXNameMangler::makeVariableTypeTags(const VarDecl *VD) {
5945 // When derived abi tags are disabled there is no need to make any list.
5946 if (DisableDerivedAbiTags)
5947 return AbiTagList();
5948
5949 llvm::raw_null_ostream NullOutStream;
5950 CXXNameMangler TrackVariableType(*this, NullOutStream);
5951 TrackVariableType.disableDerivedAbiTags();
5952
5953 TrackVariableType.mangleType(VD->getType());
5954
5955 return TrackVariableType.AbiTagsRoot.getSortedUniqueUsedAbiTags();
5956 }
5957
shouldHaveAbiTags(ItaniumMangleContextImpl & C,const VarDecl * VD)5958 bool CXXNameMangler::shouldHaveAbiTags(ItaniumMangleContextImpl &C,
5959 const VarDecl *VD) {
5960 llvm::raw_null_ostream NullOutStream;
5961 CXXNameMangler TrackAbiTags(C, NullOutStream, nullptr, true);
5962 TrackAbiTags.mangle(VD);
5963 return TrackAbiTags.AbiTagsRoot.getUsedAbiTags().size();
5964 }
5965
5966 //
5967
5968 /// Mangles the name of the declaration D and emits that name to the given
5969 /// output stream.
5970 ///
5971 /// If the declaration D requires a mangled name, this routine will emit that
5972 /// mangled name to \p os and return true. Otherwise, \p os will be unchanged
5973 /// and this routine will return false. In this case, the caller should just
5974 /// emit the identifier of the declaration (\c D->getIdentifier()) as its
5975 /// name.
mangleCXXName(GlobalDecl GD,raw_ostream & Out)5976 void ItaniumMangleContextImpl::mangleCXXName(GlobalDecl GD,
5977 raw_ostream &Out) {
5978 const NamedDecl *D = cast<NamedDecl>(GD.getDecl());
5979 assert((isa<FunctionDecl, VarDecl, TemplateParamObjectDecl>(D)) &&
5980 "Invalid mangleName() call, argument is not a variable or function!");
5981
5982 PrettyStackTraceDecl CrashInfo(D, SourceLocation(),
5983 getASTContext().getSourceManager(),
5984 "Mangling declaration");
5985
5986 if (auto *CD = dyn_cast<CXXConstructorDecl>(D)) {
5987 auto Type = GD.getCtorType();
5988 CXXNameMangler Mangler(*this, Out, CD, Type);
5989 return Mangler.mangle(GlobalDecl(CD, Type));
5990 }
5991
5992 if (auto *DD = dyn_cast<CXXDestructorDecl>(D)) {
5993 auto Type = GD.getDtorType();
5994 CXXNameMangler Mangler(*this, Out, DD, Type);
5995 return Mangler.mangle(GlobalDecl(DD, Type));
5996 }
5997
5998 CXXNameMangler Mangler(*this, Out, D);
5999 Mangler.mangle(GD);
6000 }
6001
mangleCXXCtorComdat(const CXXConstructorDecl * D,raw_ostream & Out)6002 void ItaniumMangleContextImpl::mangleCXXCtorComdat(const CXXConstructorDecl *D,
6003 raw_ostream &Out) {
6004 CXXNameMangler Mangler(*this, Out, D, Ctor_Comdat);
6005 Mangler.mangle(GlobalDecl(D, Ctor_Comdat));
6006 }
6007
mangleCXXDtorComdat(const CXXDestructorDecl * D,raw_ostream & Out)6008 void ItaniumMangleContextImpl::mangleCXXDtorComdat(const CXXDestructorDecl *D,
6009 raw_ostream &Out) {
6010 CXXNameMangler Mangler(*this, Out, D, Dtor_Comdat);
6011 Mangler.mangle(GlobalDecl(D, Dtor_Comdat));
6012 }
6013
mangleThunk(const CXXMethodDecl * MD,const ThunkInfo & Thunk,raw_ostream & Out)6014 void ItaniumMangleContextImpl::mangleThunk(const CXXMethodDecl *MD,
6015 const ThunkInfo &Thunk,
6016 raw_ostream &Out) {
6017 // <special-name> ::= T <call-offset> <base encoding>
6018 // # base is the nominal target function of thunk
6019 // <special-name> ::= Tc <call-offset> <call-offset> <base encoding>
6020 // # base is the nominal target function of thunk
6021 // # first call-offset is 'this' adjustment
6022 // # second call-offset is result adjustment
6023
6024 assert(!isa<CXXDestructorDecl>(MD) &&
6025 "Use mangleCXXDtor for destructor decls!");
6026 CXXNameMangler Mangler(*this, Out);
6027 Mangler.getStream() << "_ZT";
6028 if (!Thunk.Return.isEmpty())
6029 Mangler.getStream() << 'c';
6030
6031 // Mangle the 'this' pointer adjustment.
6032 Mangler.mangleCallOffset(Thunk.This.NonVirtual,
6033 Thunk.This.Virtual.Itanium.VCallOffsetOffset);
6034
6035 // Mangle the return pointer adjustment if there is one.
6036 if (!Thunk.Return.isEmpty())
6037 Mangler.mangleCallOffset(Thunk.Return.NonVirtual,
6038 Thunk.Return.Virtual.Itanium.VBaseOffsetOffset);
6039
6040 Mangler.mangleFunctionEncoding(MD);
6041 }
6042
mangleCXXDtorThunk(const CXXDestructorDecl * DD,CXXDtorType Type,const ThisAdjustment & ThisAdjustment,raw_ostream & Out)6043 void ItaniumMangleContextImpl::mangleCXXDtorThunk(
6044 const CXXDestructorDecl *DD, CXXDtorType Type,
6045 const ThisAdjustment &ThisAdjustment, raw_ostream &Out) {
6046 // <special-name> ::= T <call-offset> <base encoding>
6047 // # base is the nominal target function of thunk
6048 CXXNameMangler Mangler(*this, Out, DD, Type);
6049 Mangler.getStream() << "_ZT";
6050
6051 // Mangle the 'this' pointer adjustment.
6052 Mangler.mangleCallOffset(ThisAdjustment.NonVirtual,
6053 ThisAdjustment.Virtual.Itanium.VCallOffsetOffset);
6054
6055 Mangler.mangleFunctionEncoding(GlobalDecl(DD, Type));
6056 }
6057
6058 /// Returns the mangled name for a guard variable for the passed in VarDecl.
mangleStaticGuardVariable(const VarDecl * D,raw_ostream & Out)6059 void ItaniumMangleContextImpl::mangleStaticGuardVariable(const VarDecl *D,
6060 raw_ostream &Out) {
6061 // <special-name> ::= GV <object name> # Guard variable for one-time
6062 // # initialization
6063 CXXNameMangler Mangler(*this, Out);
6064 // GCC 5.3.0 doesn't emit derived ABI tags for local names but that seems to
6065 // be a bug that is fixed in trunk.
6066 Mangler.getStream() << "_ZGV";
6067 Mangler.mangleName(D);
6068 }
6069
mangleDynamicInitializer(const VarDecl * MD,raw_ostream & Out)6070 void ItaniumMangleContextImpl::mangleDynamicInitializer(const VarDecl *MD,
6071 raw_ostream &Out) {
6072 // These symbols are internal in the Itanium ABI, so the names don't matter.
6073 // Clang has traditionally used this symbol and allowed LLVM to adjust it to
6074 // avoid duplicate symbols.
6075 Out << "__cxx_global_var_init";
6076 }
6077
mangleDynamicAtExitDestructor(const VarDecl * D,raw_ostream & Out)6078 void ItaniumMangleContextImpl::mangleDynamicAtExitDestructor(const VarDecl *D,
6079 raw_ostream &Out) {
6080 // Prefix the mangling of D with __dtor_.
6081 CXXNameMangler Mangler(*this, Out);
6082 Mangler.getStream() << "__dtor_";
6083 if (shouldMangleDeclName(D))
6084 Mangler.mangle(D);
6085 else
6086 Mangler.getStream() << D->getName();
6087 }
6088
mangleDynamicStermFinalizer(const VarDecl * D,raw_ostream & Out)6089 void ItaniumMangleContextImpl::mangleDynamicStermFinalizer(const VarDecl *D,
6090 raw_ostream &Out) {
6091 // Clang generates these internal-linkage functions as part of its
6092 // implementation of the XL ABI.
6093 CXXNameMangler Mangler(*this, Out);
6094 Mangler.getStream() << "__finalize_";
6095 if (shouldMangleDeclName(D))
6096 Mangler.mangle(D);
6097 else
6098 Mangler.getStream() << D->getName();
6099 }
6100
mangleSEHFilterExpression(const NamedDecl * EnclosingDecl,raw_ostream & Out)6101 void ItaniumMangleContextImpl::mangleSEHFilterExpression(
6102 const NamedDecl *EnclosingDecl, raw_ostream &Out) {
6103 CXXNameMangler Mangler(*this, Out);
6104 Mangler.getStream() << "__filt_";
6105 if (shouldMangleDeclName(EnclosingDecl))
6106 Mangler.mangle(EnclosingDecl);
6107 else
6108 Mangler.getStream() << EnclosingDecl->getName();
6109 }
6110
mangleSEHFinallyBlock(const NamedDecl * EnclosingDecl,raw_ostream & Out)6111 void ItaniumMangleContextImpl::mangleSEHFinallyBlock(
6112 const NamedDecl *EnclosingDecl, raw_ostream &Out) {
6113 CXXNameMangler Mangler(*this, Out);
6114 Mangler.getStream() << "__fin_";
6115 if (shouldMangleDeclName(EnclosingDecl))
6116 Mangler.mangle(EnclosingDecl);
6117 else
6118 Mangler.getStream() << EnclosingDecl->getName();
6119 }
6120
mangleItaniumThreadLocalInit(const VarDecl * D,raw_ostream & Out)6121 void ItaniumMangleContextImpl::mangleItaniumThreadLocalInit(const VarDecl *D,
6122 raw_ostream &Out) {
6123 // <special-name> ::= TH <object name>
6124 CXXNameMangler Mangler(*this, Out);
6125 Mangler.getStream() << "_ZTH";
6126 Mangler.mangleName(D);
6127 }
6128
6129 void
mangleItaniumThreadLocalWrapper(const VarDecl * D,raw_ostream & Out)6130 ItaniumMangleContextImpl::mangleItaniumThreadLocalWrapper(const VarDecl *D,
6131 raw_ostream &Out) {
6132 // <special-name> ::= TW <object name>
6133 CXXNameMangler Mangler(*this, Out);
6134 Mangler.getStream() << "_ZTW";
6135 Mangler.mangleName(D);
6136 }
6137
mangleReferenceTemporary(const VarDecl * D,unsigned ManglingNumber,raw_ostream & Out)6138 void ItaniumMangleContextImpl::mangleReferenceTemporary(const VarDecl *D,
6139 unsigned ManglingNumber,
6140 raw_ostream &Out) {
6141 // We match the GCC mangling here.
6142 // <special-name> ::= GR <object name>
6143 CXXNameMangler Mangler(*this, Out);
6144 Mangler.getStream() << "_ZGR";
6145 Mangler.mangleName(D);
6146 assert(ManglingNumber > 0 && "Reference temporary mangling number is zero!");
6147 Mangler.mangleSeqID(ManglingNumber - 1);
6148 }
6149
mangleCXXVTable(const CXXRecordDecl * RD,raw_ostream & Out)6150 void ItaniumMangleContextImpl::mangleCXXVTable(const CXXRecordDecl *RD,
6151 raw_ostream &Out) {
6152 // <special-name> ::= TV <type> # virtual table
6153 CXXNameMangler Mangler(*this, Out);
6154 Mangler.getStream() << "_ZTV";
6155 Mangler.mangleNameOrStandardSubstitution(RD);
6156 }
6157
mangleCXXVTT(const CXXRecordDecl * RD,raw_ostream & Out)6158 void ItaniumMangleContextImpl::mangleCXXVTT(const CXXRecordDecl *RD,
6159 raw_ostream &Out) {
6160 // <special-name> ::= TT <type> # VTT structure
6161 CXXNameMangler Mangler(*this, Out);
6162 Mangler.getStream() << "_ZTT";
6163 Mangler.mangleNameOrStandardSubstitution(RD);
6164 }
6165
mangleCXXCtorVTable(const CXXRecordDecl * RD,int64_t Offset,const CXXRecordDecl * Type,raw_ostream & Out)6166 void ItaniumMangleContextImpl::mangleCXXCtorVTable(const CXXRecordDecl *RD,
6167 int64_t Offset,
6168 const CXXRecordDecl *Type,
6169 raw_ostream &Out) {
6170 // <special-name> ::= TC <type> <offset number> _ <base type>
6171 CXXNameMangler Mangler(*this, Out);
6172 Mangler.getStream() << "_ZTC";
6173 Mangler.mangleNameOrStandardSubstitution(RD);
6174 Mangler.getStream() << Offset;
6175 Mangler.getStream() << '_';
6176 Mangler.mangleNameOrStandardSubstitution(Type);
6177 }
6178
mangleCXXRTTI(QualType Ty,raw_ostream & Out)6179 void ItaniumMangleContextImpl::mangleCXXRTTI(QualType Ty, raw_ostream &Out) {
6180 // <special-name> ::= TI <type> # typeinfo structure
6181 assert(!Ty.hasQualifiers() && "RTTI info cannot have top-level qualifiers");
6182 CXXNameMangler Mangler(*this, Out);
6183 Mangler.getStream() << "_ZTI";
6184 Mangler.mangleType(Ty);
6185 }
6186
mangleCXXRTTIName(QualType Ty,raw_ostream & Out)6187 void ItaniumMangleContextImpl::mangleCXXRTTIName(QualType Ty,
6188 raw_ostream &Out) {
6189 // <special-name> ::= TS <type> # typeinfo name (null terminated byte string)
6190 CXXNameMangler Mangler(*this, Out);
6191 Mangler.getStream() << "_ZTS";
6192 Mangler.mangleType(Ty);
6193 }
6194
mangleTypeName(QualType Ty,raw_ostream & Out)6195 void ItaniumMangleContextImpl::mangleTypeName(QualType Ty, raw_ostream &Out) {
6196 mangleCXXRTTIName(Ty, Out);
6197 }
6198
mangleStringLiteral(const StringLiteral *,raw_ostream &)6199 void ItaniumMangleContextImpl::mangleStringLiteral(const StringLiteral *, raw_ostream &) {
6200 llvm_unreachable("Can't mangle string literals");
6201 }
6202
mangleLambdaSig(const CXXRecordDecl * Lambda,raw_ostream & Out)6203 void ItaniumMangleContextImpl::mangleLambdaSig(const CXXRecordDecl *Lambda,
6204 raw_ostream &Out) {
6205 CXXNameMangler Mangler(*this, Out);
6206 Mangler.mangleLambdaSig(Lambda);
6207 }
6208
6209 ItaniumMangleContext *
create(ASTContext & Context,DiagnosticsEngine & Diags)6210 ItaniumMangleContext::create(ASTContext &Context, DiagnosticsEngine &Diags) {
6211 return new ItaniumMangleContextImpl(Context, Diags);
6212 }
6213