1 //===- MicrosoftDemangle.cpp ----------------------------------------------===//
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
7 //===----------------------------------------------------------------------===//
9 // This file defines a demangler for MSVC-style mangled symbols.
11 // This file has no dependencies on the rest of LLVM so that it can be
12 // easily reused in other programs such as libcxxabi.
14 //===----------------------------------------------------------------------===//
16 #include "llvm/Demangle/MicrosoftDemangle.h"
17 #include "llvm/Demangle/Demangle.h"
18 #include "llvm/Demangle/MicrosoftDemangleNodes.h"
20 #include "llvm/Demangle/DemangleConfig.h"
21 #include "llvm/Demangle/StringView.h"
22 #include "llvm/Demangle/Utility.h"
30 using namespace ms_demangle;
32 static bool startsWithDigit(StringView S) {
33 return !S.empty() && std::isdigit(S.front());
39 NodeList *Next = nullptr;
42 static bool isMemberPointer(StringView MangledName, bool &Error) {
44 switch (MangledName.popFront()) {
46 // This is probably an rvalue reference (e.g. $$Q), and you cannot have an
47 // rvalue reference to a member.
50 // 'A' indicates a reference, and you cannot have a reference to a member
51 // function or member.
57 // These 4 values indicate some kind of pointer, but we still don't know
65 // If it starts with a number, then 6 indicates a non-member function
66 // pointer, and 8 indicates a member function pointer.
67 if (startsWithDigit(MangledName)) {
68 assert(MangledName[0] == '6' || MangledName[0] == '8');
69 return (MangledName[0] == '8');
72 // Remove ext qualifiers since those can appear on either type and are
73 // therefore not indicative.
74 MangledName.consumeFront('E'); // 64-bit
75 MangledName.consumeFront('I'); // restrict
76 MangledName.consumeFront('F'); // unaligned
78 assert(!MangledName.empty());
80 // The next value should be either ABCD (non-member) or QRST (member).
81 switch (MangledName.front()) {
98 static SpecialIntrinsicKind
99 consumeSpecialIntrinsicKind(StringView &MangledName) {
100 if (MangledName.consumeFront("?_7"))
101 return SpecialIntrinsicKind::Vftable;
102 if (MangledName.consumeFront("?_8"))
103 return SpecialIntrinsicKind::Vbtable;
104 if (MangledName.consumeFront("?_9"))
105 return SpecialIntrinsicKind::VcallThunk;
106 if (MangledName.consumeFront("?_A"))
107 return SpecialIntrinsicKind::Typeof;
108 if (MangledName.consumeFront("?_B"))
109 return SpecialIntrinsicKind::LocalStaticGuard;
110 if (MangledName.consumeFront("?_C"))
111 return SpecialIntrinsicKind::StringLiteralSymbol;
112 if (MangledName.consumeFront("?_P"))
113 return SpecialIntrinsicKind::UdtReturning;
114 if (MangledName.consumeFront("?_R0"))
115 return SpecialIntrinsicKind::RttiTypeDescriptor;
116 if (MangledName.consumeFront("?_R1"))
117 return SpecialIntrinsicKind::RttiBaseClassDescriptor;
118 if (MangledName.consumeFront("?_R2"))
119 return SpecialIntrinsicKind::RttiBaseClassArray;
120 if (MangledName.consumeFront("?_R3"))
121 return SpecialIntrinsicKind::RttiClassHierarchyDescriptor;
122 if (MangledName.consumeFront("?_R4"))
123 return SpecialIntrinsicKind::RttiCompleteObjLocator;
124 if (MangledName.consumeFront("?_S"))
125 return SpecialIntrinsicKind::LocalVftable;
126 if (MangledName.consumeFront("?__E"))
127 return SpecialIntrinsicKind::DynamicInitializer;
128 if (MangledName.consumeFront("?__F"))
129 return SpecialIntrinsicKind::DynamicAtexitDestructor;
130 if (MangledName.consumeFront("?__J"))
131 return SpecialIntrinsicKind::LocalStaticThreadGuard;
132 return SpecialIntrinsicKind::None;
135 static bool startsWithLocalScopePattern(StringView S) {
136 if (!S.consumeFront('?'))
141 size_t End = S.find('?');
142 if (End == StringView::npos)
144 StringView Candidate = S.substr(0, End);
145 if (Candidate.empty())
149 // ?@? is the discriminator 0.
150 if (Candidate.size() == 1)
151 return Candidate[0] == '@' || (Candidate[0] >= '0' && Candidate[0] <= '9');
153 // If it's not 0-9, then it's an encoded number terminated with an @
154 if (Candidate.back() != '@')
156 Candidate = Candidate.dropBack();
158 // An encoded number starts with B-P and all subsequent digits are in A-P.
159 // Note that the reason the first digit cannot be A is two fold. First, it
160 // would create an ambiguity with ?A which delimits the beginning of an
161 // anonymous namespace. Second, A represents 0, and you don't start a multi
162 // digit number with a leading 0. Presumably the anonymous namespace
163 // ambiguity is also why single digit encoded numbers use 0-9 rather than A-J.
164 if (Candidate[0] < 'B' || Candidate[0] > 'P')
166 Candidate = Candidate.dropFront();
167 while (!Candidate.empty()) {
168 if (Candidate[0] < 'A' || Candidate[0] > 'P')
170 Candidate = Candidate.dropFront();
176 static bool isTagType(StringView S) {
187 static bool isCustomType(StringView S) { return S[0] == '?'; }
189 static bool isPointerType(StringView S) {
190 if (S.startsWith("$$Q")) // foo &&
196 case 'Q': // foo *const
197 case 'R': // foo *volatile
198 case 'S': // foo *const volatile
204 static bool isArrayType(StringView S) { return S[0] == 'Y'; }
206 static bool isFunctionType(StringView S) {
207 return S.startsWith("$$A8@@") || S.startsWith("$$A6");
210 static FunctionRefQualifier
211 demangleFunctionRefQualifier(StringView &MangledName) {
212 if (MangledName.consumeFront('G'))
213 return FunctionRefQualifier::Reference;
214 else if (MangledName.consumeFront('H'))
215 return FunctionRefQualifier::RValueReference;
216 return FunctionRefQualifier::None;
219 static std::pair<Qualifiers, PointerAffinity>
220 demanglePointerCVQualifiers(StringView &MangledName) {
221 if (MangledName.consumeFront("$$Q"))
222 return std::make_pair(Q_None, PointerAffinity::RValueReference);
224 switch (MangledName.popFront()) {
226 return std::make_pair(Q_None, PointerAffinity::Reference);
228 return std::make_pair(Q_None, PointerAffinity::Pointer);
230 return std::make_pair(Q_Const, PointerAffinity::Pointer);
232 return std::make_pair(Q_Volatile, PointerAffinity::Pointer);
234 return std::make_pair(Qualifiers(Q_Const | Q_Volatile),
235 PointerAffinity::Pointer);
237 assert(false && "Ty is not a pointer type!");
239 return std::make_pair(Q_None, PointerAffinity::Pointer);
242 StringView Demangler::copyString(StringView Borrowed) {
243 char *Stable = Arena.allocUnalignedBuffer(Borrowed.size() + 1);
244 std::strcpy(Stable, Borrowed.begin());
246 return {Stable, Borrowed.size()};
249 SpecialTableSymbolNode *
250 Demangler::demangleSpecialTableSymbolNode(StringView &MangledName,
251 SpecialIntrinsicKind K) {
252 NamedIdentifierNode *NI = Arena.alloc<NamedIdentifierNode>();
254 case SpecialIntrinsicKind::Vftable:
255 NI->Name = "`vftable'";
257 case SpecialIntrinsicKind::Vbtable:
258 NI->Name = "`vbtable'";
260 case SpecialIntrinsicKind::LocalVftable:
261 NI->Name = "`local vftable'";
263 case SpecialIntrinsicKind::RttiCompleteObjLocator:
264 NI->Name = "`RTTI Complete Object Locator'";
267 DEMANGLE_UNREACHABLE;
269 QualifiedNameNode *QN = demangleNameScopeChain(MangledName, NI);
270 SpecialTableSymbolNode *STSN = Arena.alloc<SpecialTableSymbolNode>();
272 bool IsMember = false;
273 char Front = MangledName.popFront();
274 if (Front != '6' && Front != '7') {
279 std::tie(STSN->Quals, IsMember) = demangleQualifiers(MangledName);
280 if (!MangledName.consumeFront('@'))
281 STSN->TargetName = demangleFullyQualifiedTypeName(MangledName);
285 LocalStaticGuardVariableNode *
286 Demangler::demangleLocalStaticGuard(StringView &MangledName) {
287 LocalStaticGuardIdentifierNode *LSGI =
288 Arena.alloc<LocalStaticGuardIdentifierNode>();
289 QualifiedNameNode *QN = demangleNameScopeChain(MangledName, LSGI);
290 LocalStaticGuardVariableNode *LSGVN =
291 Arena.alloc<LocalStaticGuardVariableNode>();
294 if (MangledName.consumeFront("4IA"))
295 LSGVN->IsVisible = false;
296 else if (MangledName.consumeFront("5"))
297 LSGVN->IsVisible = true;
303 if (!MangledName.empty())
304 LSGI->ScopeIndex = demangleUnsigned(MangledName);
308 static NamedIdentifierNode *synthesizeNamedIdentifier(ArenaAllocator &Arena,
310 NamedIdentifierNode *Id = Arena.alloc<NamedIdentifierNode>();
315 static QualifiedNameNode *synthesizeQualifiedName(ArenaAllocator &Arena,
316 IdentifierNode *Identifier) {
317 QualifiedNameNode *QN = Arena.alloc<QualifiedNameNode>();
318 QN->Components = Arena.alloc<NodeArrayNode>();
319 QN->Components->Count = 1;
320 QN->Components->Nodes = Arena.allocArray<Node *>(1);
321 QN->Components->Nodes[0] = Identifier;
325 static QualifiedNameNode *synthesizeQualifiedName(ArenaAllocator &Arena,
327 NamedIdentifierNode *Id = synthesizeNamedIdentifier(Arena, Name);
328 return synthesizeQualifiedName(Arena, Id);
331 static VariableSymbolNode *synthesizeVariable(ArenaAllocator &Arena,
333 StringView VariableName) {
334 VariableSymbolNode *VSN = Arena.alloc<VariableSymbolNode>();
336 VSN->Name = synthesizeQualifiedName(Arena, VariableName);
340 VariableSymbolNode *Demangler::demangleUntypedVariable(
341 ArenaAllocator &Arena, StringView &MangledName, StringView VariableName) {
342 NamedIdentifierNode *NI = synthesizeNamedIdentifier(Arena, VariableName);
343 QualifiedNameNode *QN = demangleNameScopeChain(MangledName, NI);
344 VariableSymbolNode *VSN = Arena.alloc<VariableSymbolNode>();
346 if (MangledName.consumeFront("8"))
354 Demangler::demangleRttiBaseClassDescriptorNode(ArenaAllocator &Arena,
355 StringView &MangledName) {
356 RttiBaseClassDescriptorNode *RBCDN =
357 Arena.alloc<RttiBaseClassDescriptorNode>();
358 RBCDN->NVOffset = demangleUnsigned(MangledName);
359 RBCDN->VBPtrOffset = demangleSigned(MangledName);
360 RBCDN->VBTableOffset = demangleUnsigned(MangledName);
361 RBCDN->Flags = demangleUnsigned(MangledName);
365 VariableSymbolNode *VSN = Arena.alloc<VariableSymbolNode>();
366 VSN->Name = demangleNameScopeChain(MangledName, RBCDN);
367 MangledName.consumeFront('8');
371 FunctionSymbolNode *Demangler::demangleInitFiniStub(StringView &MangledName,
373 DynamicStructorIdentifierNode *DSIN =
374 Arena.alloc<DynamicStructorIdentifierNode>();
375 DSIN->IsDestructor = IsDestructor;
377 bool IsKnownStaticDataMember = false;
378 if (MangledName.consumeFront('?'))
379 IsKnownStaticDataMember = true;
381 QualifiedNameNode *QN = demangleFullyQualifiedSymbolName(MangledName);
383 SymbolNode *Symbol = demangleEncodedSymbol(MangledName, QN);
384 FunctionSymbolNode *FSN = nullptr;
387 if (Symbol->kind() == NodeKind::VariableSymbol) {
388 DSIN->Variable = static_cast<VariableSymbolNode *>(Symbol);
390 // Older versions of clang mangled this type of symbol incorrectly. They
391 // would omit the leading ? and they would only emit a single @ at the end.
392 // The correct mangling is a leading ? and 2 trailing @ signs. Handle
394 int AtCount = IsKnownStaticDataMember ? 2 : 1;
395 for (int I = 0; I < AtCount; ++I) {
396 if (MangledName.consumeFront('@'))
402 FSN = demangleFunctionEncoding(MangledName);
403 FSN->Name = synthesizeQualifiedName(Arena, DSIN);
405 if (IsKnownStaticDataMember) {
406 // This was supposed to be a static data member, but we got a function.
411 FSN = static_cast<FunctionSymbolNode *>(Symbol);
412 DSIN->Name = Symbol->Name;
413 FSN->Name = synthesizeQualifiedName(Arena, DSIN);
419 SymbolNode *Demangler::demangleSpecialIntrinsic(StringView &MangledName) {
420 SpecialIntrinsicKind SIK = consumeSpecialIntrinsicKind(MangledName);
421 if (SIK == SpecialIntrinsicKind::None)
425 case SpecialIntrinsicKind::StringLiteralSymbol:
426 return demangleStringLiteral(MangledName);
427 case SpecialIntrinsicKind::Vftable:
428 case SpecialIntrinsicKind::Vbtable:
429 case SpecialIntrinsicKind::LocalVftable:
430 case SpecialIntrinsicKind::RttiCompleteObjLocator:
431 return demangleSpecialTableSymbolNode(MangledName, SIK);
432 case SpecialIntrinsicKind::VcallThunk:
433 return demangleVcallThunkNode(MangledName);
434 case SpecialIntrinsicKind::LocalStaticGuard:
435 return demangleLocalStaticGuard(MangledName);
436 case SpecialIntrinsicKind::RttiTypeDescriptor: {
437 TypeNode *T = demangleType(MangledName, QualifierMangleMode::Result);
440 if (!MangledName.consumeFront("@8"))
442 if (!MangledName.empty())
444 return synthesizeVariable(Arena, T, "`RTTI Type Descriptor'");
446 case SpecialIntrinsicKind::RttiBaseClassArray:
447 return demangleUntypedVariable(Arena, MangledName,
448 "`RTTI Base Class Array'");
449 case SpecialIntrinsicKind::RttiClassHierarchyDescriptor:
450 return demangleUntypedVariable(Arena, MangledName,
451 "`RTTI Class Hierarchy Descriptor'");
452 case SpecialIntrinsicKind::RttiBaseClassDescriptor:
453 return demangleRttiBaseClassDescriptorNode(Arena, MangledName);
454 case SpecialIntrinsicKind::DynamicInitializer:
455 return demangleInitFiniStub(MangledName, false);
456 case SpecialIntrinsicKind::DynamicAtexitDestructor:
457 return demangleInitFiniStub(MangledName, true);
466 Demangler::demangleFunctionIdentifierCode(StringView &MangledName) {
467 assert(MangledName.startsWith('?'));
468 MangledName = MangledName.dropFront();
469 if (MangledName.empty()) {
474 if (MangledName.consumeFront("__"))
475 return demangleFunctionIdentifierCode(
476 MangledName, FunctionIdentifierCodeGroup::DoubleUnder);
477 else if (MangledName.consumeFront("_"))
478 return demangleFunctionIdentifierCode(MangledName,
479 FunctionIdentifierCodeGroup::Under);
480 return demangleFunctionIdentifierCode(MangledName,
481 FunctionIdentifierCodeGroup::Basic);
484 StructorIdentifierNode *
485 Demangler::demangleStructorIdentifier(StringView &MangledName,
487 StructorIdentifierNode *N = Arena.alloc<StructorIdentifierNode>();
488 N->IsDestructor = IsDestructor;
492 ConversionOperatorIdentifierNode *
493 Demangler::demangleConversionOperatorIdentifier(StringView &MangledName) {
494 ConversionOperatorIdentifierNode *N =
495 Arena.alloc<ConversionOperatorIdentifierNode>();
499 LiteralOperatorIdentifierNode *
500 Demangler::demangleLiteralOperatorIdentifier(StringView &MangledName) {
501 LiteralOperatorIdentifierNode *N =
502 Arena.alloc<LiteralOperatorIdentifierNode>();
503 N->Name = demangleSimpleString(MangledName, false);
507 static IntrinsicFunctionKind
508 translateIntrinsicFunctionCode(char CH, FunctionIdentifierCodeGroup Group) {
509 // Not all ? identifiers are intrinsics *functions*. This function only maps
510 // operator codes for the special functions, all others are handled elsewhere,
511 // hence the IFK::None entries in the table.
512 using IFK = IntrinsicFunctionKind;
513 static IFK Basic[36] = {
514 IFK::None, // ?0 # Foo::Foo()
515 IFK::None, // ?1 # Foo::~Foo()
516 IFK::New, // ?2 # operator new
517 IFK::Delete, // ?3 # operator delete
518 IFK::Assign, // ?4 # operator=
519 IFK::RightShift, // ?5 # operator>>
520 IFK::LeftShift, // ?6 # operator<<
521 IFK::LogicalNot, // ?7 # operator!
522 IFK::Equals, // ?8 # operator==
523 IFK::NotEquals, // ?9 # operator!=
524 IFK::ArraySubscript, // ?A # operator[]
525 IFK::None, // ?B # Foo::operator <type>()
526 IFK::Pointer, // ?C # operator->
527 IFK::Dereference, // ?D # operator*
528 IFK::Increment, // ?E # operator++
529 IFK::Decrement, // ?F # operator--
530 IFK::Minus, // ?G # operator-
531 IFK::Plus, // ?H # operator+
532 IFK::BitwiseAnd, // ?I # operator&
533 IFK::MemberPointer, // ?J # operator->*
534 IFK::Divide, // ?K # operator/
535 IFK::Modulus, // ?L # operator%
536 IFK::LessThan, // ?M operator<
537 IFK::LessThanEqual, // ?N operator<=
538 IFK::GreaterThan, // ?O operator>
539 IFK::GreaterThanEqual, // ?P operator>=
540 IFK::Comma, // ?Q operator,
541 IFK::Parens, // ?R operator()
542 IFK::BitwiseNot, // ?S operator~
543 IFK::BitwiseXor, // ?T operator^
544 IFK::BitwiseOr, // ?U operator|
545 IFK::LogicalAnd, // ?V operator&&
546 IFK::LogicalOr, // ?W operator||
547 IFK::TimesEqual, // ?X operator*=
548 IFK::PlusEqual, // ?Y operator+=
549 IFK::MinusEqual, // ?Z operator-=
551 static IFK Under[36] = {
552 IFK::DivEqual, // ?_0 operator/=
553 IFK::ModEqual, // ?_1 operator%=
554 IFK::RshEqual, // ?_2 operator>>=
555 IFK::LshEqual, // ?_3 operator<<=
556 IFK::BitwiseAndEqual, // ?_4 operator&=
557 IFK::BitwiseOrEqual, // ?_5 operator|=
558 IFK::BitwiseXorEqual, // ?_6 operator^=
559 IFK::None, // ?_7 # vftable
560 IFK::None, // ?_8 # vbtable
561 IFK::None, // ?_9 # vcall
562 IFK::None, // ?_A # typeof
563 IFK::None, // ?_B # local static guard
564 IFK::None, // ?_C # string literal
565 IFK::VbaseDtor, // ?_D # vbase destructor
566 IFK::VecDelDtor, // ?_E # vector deleting destructor
567 IFK::DefaultCtorClosure, // ?_F # default constructor closure
568 IFK::ScalarDelDtor, // ?_G # scalar deleting destructor
569 IFK::VecCtorIter, // ?_H # vector constructor iterator
570 IFK::VecDtorIter, // ?_I # vector destructor iterator
571 IFK::VecVbaseCtorIter, // ?_J # vector vbase constructor iterator
572 IFK::VdispMap, // ?_K # virtual displacement map
573 IFK::EHVecCtorIter, // ?_L # eh vector constructor iterator
574 IFK::EHVecDtorIter, // ?_M # eh vector destructor iterator
575 IFK::EHVecVbaseCtorIter, // ?_N # eh vector vbase constructor iterator
576 IFK::CopyCtorClosure, // ?_O # copy constructor closure
577 IFK::None, // ?_P<name> # udt returning <name>
578 IFK::None, // ?_Q # <unknown>
579 IFK::None, // ?_R0 - ?_R4 # RTTI Codes
580 IFK::None, // ?_S # local vftable
581 IFK::LocalVftableCtorClosure, // ?_T # local vftable constructor closure
582 IFK::ArrayNew, // ?_U operator new[]
583 IFK::ArrayDelete, // ?_V operator delete[]
584 IFK::None, // ?_W <unused>
585 IFK::None, // ?_X <unused>
586 IFK::None, // ?_Y <unused>
587 IFK::None, // ?_Z <unused>
589 static IFK DoubleUnder[36] = {
590 IFK::None, // ?__0 <unused>
591 IFK::None, // ?__1 <unused>
592 IFK::None, // ?__2 <unused>
593 IFK::None, // ?__3 <unused>
594 IFK::None, // ?__4 <unused>
595 IFK::None, // ?__5 <unused>
596 IFK::None, // ?__6 <unused>
597 IFK::None, // ?__7 <unused>
598 IFK::None, // ?__8 <unused>
599 IFK::None, // ?__9 <unused>
600 IFK::ManVectorCtorIter, // ?__A managed vector ctor iterator
601 IFK::ManVectorDtorIter, // ?__B managed vector dtor iterator
602 IFK::EHVectorCopyCtorIter, // ?__C EH vector copy ctor iterator
603 IFK::EHVectorVbaseCopyCtorIter, // ?__D EH vector vbase copy ctor iter
604 IFK::None, // ?__E dynamic initializer for `T'
605 IFK::None, // ?__F dynamic atexit destructor for `T'
606 IFK::VectorCopyCtorIter, // ?__G vector copy constructor iter
607 IFK::VectorVbaseCopyCtorIter, // ?__H vector vbase copy ctor iter
608 IFK::ManVectorVbaseCopyCtorIter, // ?__I managed vector vbase copy ctor
610 IFK::None, // ?__J local static thread guard
611 IFK::None, // ?__K operator ""_name
612 IFK::CoAwait, // ?__L co_await
613 IFK::None, // ?__M <unused>
614 IFK::None, // ?__N <unused>
615 IFK::None, // ?__O <unused>
616 IFK::None, // ?__P <unused>
617 IFK::None, // ?__Q <unused>
618 IFK::None, // ?__R <unused>
619 IFK::None, // ?__S <unused>
620 IFK::None, // ?__T <unused>
621 IFK::None, // ?__U <unused>
622 IFK::None, // ?__V <unused>
623 IFK::None, // ?__W <unused>
624 IFK::None, // ?__X <unused>
625 IFK::None, // ?__Y <unused>
626 IFK::None, // ?__Z <unused>
629 int Index = (CH >= '0' && CH <= '9') ? (CH - '0') : (CH - 'A' + 10);
631 case FunctionIdentifierCodeGroup::Basic:
633 case FunctionIdentifierCodeGroup::Under:
635 case FunctionIdentifierCodeGroup::DoubleUnder:
636 return DoubleUnder[Index];
638 DEMANGLE_UNREACHABLE;
642 Demangler::demangleFunctionIdentifierCode(StringView &MangledName,
643 FunctionIdentifierCodeGroup Group) {
644 assert(!MangledName.empty());
646 case FunctionIdentifierCodeGroup::Basic:
647 switch (char CH = MangledName.popFront()) {
650 return demangleStructorIdentifier(MangledName, CH == '1');
652 return demangleConversionOperatorIdentifier(MangledName);
654 return Arena.alloc<IntrinsicFunctionIdentifierNode>(
655 translateIntrinsicFunctionCode(CH, Group));
658 case FunctionIdentifierCodeGroup::Under:
659 return Arena.alloc<IntrinsicFunctionIdentifierNode>(
660 translateIntrinsicFunctionCode(MangledName.popFront(), Group));
661 case FunctionIdentifierCodeGroup::DoubleUnder:
662 switch (char CH = MangledName.popFront()) {
664 return demangleLiteralOperatorIdentifier(MangledName);
666 return Arena.alloc<IntrinsicFunctionIdentifierNode>(
667 translateIntrinsicFunctionCode(CH, Group));
670 // No Mangling Yet: Spaceship, // operator<=>
675 SymbolNode *Demangler::demangleEncodedSymbol(StringView &MangledName,
676 QualifiedNameNode *Name) {
678 switch (MangledName.front()) {
684 StorageClass SC = demangleVariableStorageClass(MangledName);
685 return demangleVariableEncoding(MangledName, SC);
690 FunctionSymbolNode *FSN = demangleFunctionEncoding(MangledName);
692 IdentifierNode *UQN = Name->getUnqualifiedIdentifier();
693 if (UQN->kind() == NodeKind::ConversionOperatorIdentifier) {
694 ConversionOperatorIdentifierNode *COIN =
695 static_cast<ConversionOperatorIdentifierNode *>(UQN);
696 COIN->TargetType = FSN->Signature->ReturnType;
701 // Parser entry point.
702 SymbolNode *Demangler::parse(StringView &MangledName) {
703 // We can't demangle MD5 names, just output them as-is.
704 // Also, MSVC-style mangled symbols must start with '?'.
705 if (MangledName.startsWith("??@")) {
706 // This is an MD5 mangled name. We can't demangle it, just return the
708 SymbolNode *S = Arena.alloc<SymbolNode>(NodeKind::Md5Symbol);
709 S->Name = synthesizeQualifiedName(Arena, MangledName);
713 if (!MangledName.startsWith('?')) {
718 MangledName.consumeFront('?');
720 // ?$ is a template instantiation, but all other names that start with ? are
721 // operators / special names.
722 if (SymbolNode *SI = demangleSpecialIntrinsic(MangledName))
725 // What follows is a main symbol name. This may include namespaces or class
727 QualifiedNameNode *QN = demangleFullyQualifiedSymbolName(MangledName);
731 SymbolNode *Symbol = demangleEncodedSymbol(MangledName, QN);
742 TagTypeNode *Demangler::parseTagUniqueName(StringView &MangledName) {
743 if (!MangledName.consumeFront(".?A"))
745 MangledName.consumeFront(".?A");
746 if (MangledName.empty())
749 return demangleClassType(MangledName);
752 // <type-encoding> ::= <storage-class> <variable-type>
753 // <storage-class> ::= 0 # private static member
754 // ::= 1 # protected static member
755 // ::= 2 # public static member
757 // ::= 4 # static local
759 VariableSymbolNode *Demangler::demangleVariableEncoding(StringView &MangledName,
761 VariableSymbolNode *VSN = Arena.alloc<VariableSymbolNode>();
763 VSN->Type = demangleType(MangledName, QualifierMangleMode::Drop);
766 // <variable-type> ::= <type> <cvr-qualifiers>
767 // ::= <type> <pointee-cvr-qualifiers> # pointers, references
768 switch (VSN->Type->kind()) {
769 case NodeKind::PointerType: {
770 PointerTypeNode *PTN = static_cast<PointerTypeNode *>(VSN->Type);
772 Qualifiers ExtraChildQuals = Q_None;
773 PTN->Quals = Qualifiers(VSN->Type->Quals |
774 demanglePointerExtQualifiers(MangledName));
776 bool IsMember = false;
777 std::tie(ExtraChildQuals, IsMember) = demangleQualifiers(MangledName);
779 if (PTN->ClassParent) {
780 QualifiedNameNode *BackRefName =
781 demangleFullyQualifiedTypeName(MangledName);
784 PTN->Pointee->Quals = Qualifiers(PTN->Pointee->Quals | ExtraChildQuals);
789 VSN->Type->Quals = demangleQualifiers(MangledName).first;
796 // Sometimes numbers are encoded in mangled symbols. For example,
797 // "int (*x)[20]" is a valid C type (x is a pointer to an array of
798 // length 20), so we need some way to embed numbers as part of symbols.
799 // This function parses it.
801 // <number> ::= [?] <non-negative integer>
803 // <non-negative integer> ::= <decimal digit> # when 1 <= Number <= 10
804 // ::= <hex digit>+ @ # when Numbrer == 0 or >= 10
806 // <hex-digit> ::= [A-P] # A = 0, B = 1, ...
807 std::pair<uint64_t, bool> Demangler::demangleNumber(StringView &MangledName) {
808 bool IsNegative = MangledName.consumeFront('?');
810 if (startsWithDigit(MangledName)) {
811 uint64_t Ret = MangledName[0] - '0' + 1;
812 MangledName = MangledName.dropFront(1);
813 return {Ret, IsNegative};
817 for (size_t i = 0; i < MangledName.size(); ++i) {
818 char C = MangledName[i];
820 MangledName = MangledName.dropFront(i + 1);
821 return {Ret, IsNegative};
823 if ('A' <= C && C <= 'P') {
824 Ret = (Ret << 4) + (C - 'A');
831 return {0ULL, false};
834 uint64_t Demangler::demangleUnsigned(StringView &MangledName) {
835 bool IsNegative = false;
837 std::tie(Number, IsNegative) = demangleNumber(MangledName);
843 int64_t Demangler::demangleSigned(StringView &MangledName) {
844 bool IsNegative = false;
846 std::tie(Number, IsNegative) = demangleNumber(MangledName);
847 if (Number > INT64_MAX)
849 int64_t I = static_cast<int64_t>(Number);
850 return IsNegative ? -I : I;
853 // First 10 strings can be referenced by special BackReferences ?0, ?1, ..., ?9.
855 void Demangler::memorizeString(StringView S) {
856 if (Backrefs.NamesCount >= BackrefContext::Max)
858 for (size_t i = 0; i < Backrefs.NamesCount; ++i)
859 if (S == Backrefs.Names[i]->Name)
861 NamedIdentifierNode *N = Arena.alloc<NamedIdentifierNode>();
863 Backrefs.Names[Backrefs.NamesCount++] = N;
866 NamedIdentifierNode *Demangler::demangleBackRefName(StringView &MangledName) {
867 assert(startsWithDigit(MangledName));
869 size_t I = MangledName[0] - '0';
870 if (I >= Backrefs.NamesCount) {
875 MangledName = MangledName.dropFront();
876 return Backrefs.Names[I];
879 void Demangler::memorizeIdentifier(IdentifierNode *Identifier) {
880 // Render this class template name into a string buffer so that we can
881 // memorize it for the purpose of back-referencing.
883 if (!initializeOutputStream(nullptr, nullptr, OS, 1024))
884 // FIXME: Propagate out-of-memory as an error?
886 Identifier->output(OS, OF_Default);
888 char *Name = OS.getBuffer();
890 StringView Owned = copyString(Name);
891 memorizeString(Owned);
896 Demangler::demangleTemplateInstantiationName(StringView &MangledName,
897 NameBackrefBehavior NBB) {
898 assert(MangledName.startsWith("?$"));
899 MangledName.consumeFront("?$");
901 BackrefContext OuterContext;
902 std::swap(OuterContext, Backrefs);
904 IdentifierNode *Identifier =
905 demangleUnqualifiedSymbolName(MangledName, NBB_Simple);
907 Identifier->TemplateParams = demangleTemplateParameterList(MangledName);
909 std::swap(OuterContext, Backrefs);
913 if (NBB & NBB_Template)
914 memorizeIdentifier(Identifier);
919 NamedIdentifierNode *Demangler::demangleSimpleName(StringView &MangledName,
921 StringView S = demangleSimpleString(MangledName, Memorize);
925 NamedIdentifierNode *Name = Arena.alloc<NamedIdentifierNode>();
930 static bool isRebasedHexDigit(char C) { return (C >= 'A' && C <= 'P'); }
932 static uint8_t rebasedHexDigitToNumber(char C) {
933 assert(isRebasedHexDigit(C));
934 return (C <= 'J') ? (C - 'A') : (10 + C - 'K');
937 uint8_t Demangler::demangleCharLiteral(StringView &MangledName) {
938 if (!MangledName.startsWith('?'))
939 return MangledName.popFront();
941 MangledName = MangledName.dropFront();
942 if (MangledName.empty())
943 goto CharLiteralError;
945 if (MangledName.consumeFront('$')) {
947 if (MangledName.size() < 2)
948 goto CharLiteralError;
949 StringView Nibbles = MangledName.substr(0, 2);
950 if (!isRebasedHexDigit(Nibbles[0]) || !isRebasedHexDigit(Nibbles[1]))
951 goto CharLiteralError;
952 // Don't append the null terminator.
953 uint8_t C1 = rebasedHexDigitToNumber(Nibbles[0]);
954 uint8_t C2 = rebasedHexDigitToNumber(Nibbles[1]);
955 MangledName = MangledName.dropFront(2);
956 return (C1 << 4) | C2;
959 if (startsWithDigit(MangledName)) {
960 const char *Lookup = ",/\\:. \n\t'-";
961 char C = Lookup[MangledName[0] - '0'];
962 MangledName = MangledName.dropFront();
966 if (MangledName[0] >= 'a' && MangledName[0] <= 'z') {
967 char Lookup[26] = {'\xE1', '\xE2', '\xE3', '\xE4', '\xE5', '\xE6', '\xE7',
968 '\xE8', '\xE9', '\xEA', '\xEB', '\xEC', '\xED', '\xEE',
969 '\xEF', '\xF0', '\xF1', '\xF2', '\xF3', '\xF4', '\xF5',
970 '\xF6', '\xF7', '\xF8', '\xF9', '\xFA'};
971 char C = Lookup[MangledName[0] - 'a'];
972 MangledName = MangledName.dropFront();
976 if (MangledName[0] >= 'A' && MangledName[0] <= 'Z') {
977 char Lookup[26] = {'\xC1', '\xC2', '\xC3', '\xC4', '\xC5', '\xC6', '\xC7',
978 '\xC8', '\xC9', '\xCA', '\xCB', '\xCC', '\xCD', '\xCE',
979 '\xCF', '\xD0', '\xD1', '\xD2', '\xD3', '\xD4', '\xD5',
980 '\xD6', '\xD7', '\xD8', '\xD9', '\xDA'};
981 char C = Lookup[MangledName[0] - 'A'];
982 MangledName = MangledName.dropFront();
991 wchar_t Demangler::demangleWcharLiteral(StringView &MangledName) {
994 C1 = demangleCharLiteral(MangledName);
996 goto WCharLiteralError;
997 C2 = demangleCharLiteral(MangledName);
999 goto WCharLiteralError;
1001 return ((wchar_t)C1 << 8) | (wchar_t)C2;
1008 static void writeHexDigit(char *Buffer, uint8_t Digit) {
1009 assert(Digit <= 15);
1010 *Buffer = (Digit < 10) ? ('0' + Digit) : ('A' + Digit - 10);
1013 static void outputHex(OutputStream &OS, unsigned C) {
1018 // It's easier to do the math if we can work from right to left, but we need
1019 // to print the numbers from left to right. So render this into a temporary
1020 // buffer first, then output the temporary buffer. Each byte is of the form
1021 // \xAB, which means that each byte needs 4 characters. Since there are at
1022 // most 4 bytes, we need a 4*4+1 = 17 character temporary buffer.
1023 char TempBuffer[17];
1025 ::memset(TempBuffer, 0, sizeof(TempBuffer));
1026 constexpr int MaxPos = 15;
1028 int Pos = MaxPos - 1;
1030 for (int I = 0; I < 2; ++I) {
1031 writeHexDigit(&TempBuffer[Pos--], C % 16);
1034 TempBuffer[Pos--] = 'x';
1035 TempBuffer[Pos--] = '\\';
1038 OS << StringView(&TempBuffer[Pos + 1]);
1041 static void outputEscapedChar(OutputStream &OS, unsigned C) {
1043 case '\'': // single quote
1046 case '\"': // double quote
1049 case '\\': // backslash
1055 case '\b': // backspace
1058 case '\f': // form feed
1061 case '\n': // new line
1064 case '\r': // carriage return
1070 case '\v': // vertical tab
1077 if (C > 0x1F && C < 0x7F) {
1078 // Standard ascii char.
1086 static unsigned countTrailingNullBytes(const uint8_t *StringBytes, int Length) {
1087 const uint8_t *End = StringBytes + Length - 1;
1089 while (Length > 0 && *End == 0) {
1097 static unsigned countEmbeddedNulls(const uint8_t *StringBytes,
1099 unsigned Result = 0;
1100 for (unsigned I = 0; I < Length; ++I) {
1101 if (*StringBytes++ == 0)
1107 static unsigned guessCharByteSize(const uint8_t *StringBytes, unsigned NumChars,
1108 unsigned NumBytes) {
1109 assert(NumBytes > 0);
1111 // If the number of bytes is odd, this is guaranteed to be a char string.
1112 if (NumBytes % 2 == 1)
1115 // All strings can encode at most 32 bytes of data. If it's less than that,
1116 // then we encoded the entire string. In this case we check for a 1-byte,
1117 // 2-byte, or 4-byte null terminator.
1118 if (NumBytes < 32) {
1119 unsigned TrailingNulls = countTrailingNullBytes(StringBytes, NumChars);
1120 if (TrailingNulls >= 4)
1122 if (TrailingNulls >= 2)
1127 // The whole string was not able to be encoded. Try to look at embedded null
1128 // terminators to guess. The heuristic is that we count all embedded null
1129 // terminators. If more than 2/3 are null, it's a char32. If more than 1/3
1130 // are null, it's a char16. Otherwise it's a char8. This obviously isn't
1131 // perfect and is biased towards languages that have ascii alphabets, but this
1132 // was always going to be best effort since the encoding is lossy.
1133 unsigned Nulls = countEmbeddedNulls(StringBytes, NumChars);
1134 if (Nulls >= 2 * NumChars / 3)
1136 if (Nulls >= NumChars / 3)
1141 static unsigned decodeMultiByteChar(const uint8_t *StringBytes,
1142 unsigned CharIndex, unsigned CharBytes) {
1143 assert(CharBytes == 1 || CharBytes == 2 || CharBytes == 4);
1144 unsigned Offset = CharIndex * CharBytes;
1145 unsigned Result = 0;
1146 StringBytes = StringBytes + Offset;
1147 for (unsigned I = 0; I < CharBytes; ++I) {
1148 unsigned C = static_cast<unsigned>(StringBytes[I]);
1149 Result |= C << (8 * I);
1154 FunctionSymbolNode *Demangler::demangleVcallThunkNode(StringView &MangledName) {
1155 FunctionSymbolNode *FSN = Arena.alloc<FunctionSymbolNode>();
1156 VcallThunkIdentifierNode *VTIN = Arena.alloc<VcallThunkIdentifierNode>();
1157 FSN->Signature = Arena.alloc<ThunkSignatureNode>();
1158 FSN->Signature->FunctionClass = FC_NoParameterList;
1160 FSN->Name = demangleNameScopeChain(MangledName, VTIN);
1162 Error = !MangledName.consumeFront("$B");
1164 VTIN->OffsetInVTable = demangleUnsigned(MangledName);
1166 Error = !MangledName.consumeFront('A');
1168 FSN->Signature->CallConvention = demangleCallingConvention(MangledName);
1169 return (Error) ? nullptr : FSN;
1172 EncodedStringLiteralNode *
1173 Demangler::demangleStringLiteral(StringView &MangledName) {
1174 // This function uses goto, so declare all variables up front.
1177 uint64_t StringByteSize;
1178 bool IsWcharT = false;
1179 bool IsNegative = false;
1180 size_t CrcEndPos = 0;
1181 char *ResultBuffer = nullptr;
1183 EncodedStringLiteralNode *Result = Arena.alloc<EncodedStringLiteralNode>();
1185 // Prefix indicating the beginning of a string literal
1186 if (!MangledName.consumeFront("@_"))
1187 goto StringLiteralError;
1188 if (MangledName.empty())
1189 goto StringLiteralError;
1191 // Char Type (regular or wchar_t)
1192 switch (MangledName.popFront()) {
1195 DEMANGLE_FALLTHROUGH;
1199 goto StringLiteralError;
1203 std::tie(StringByteSize, IsNegative) = demangleNumber(MangledName);
1204 if (Error || IsNegative)
1205 goto StringLiteralError;
1207 // CRC 32 (always 8 characters plus a terminator)
1208 CrcEndPos = MangledName.find('@');
1209 if (CrcEndPos == StringView::npos)
1210 goto StringLiteralError;
1211 CRC = MangledName.substr(0, CrcEndPos);
1212 MangledName = MangledName.dropFront(CrcEndPos + 1);
1213 if (MangledName.empty())
1214 goto StringLiteralError;
1216 if (!initializeOutputStream(nullptr, nullptr, OS, 1024))
1217 // FIXME: Propagate out-of-memory as an error?
1220 Result->Char = CharKind::Wchar;
1221 if (StringByteSize > 64)
1222 Result->IsTruncated = true;
1224 while (!MangledName.consumeFront('@')) {
1225 assert(StringByteSize >= 2);
1226 wchar_t W = demangleWcharLiteral(MangledName);
1227 if (StringByteSize != 2 || Result->IsTruncated)
1228 outputEscapedChar(OS, W);
1229 StringByteSize -= 2;
1231 goto StringLiteralError;
1234 // The max byte length is actually 32, but some compilers mangled strings
1235 // incorrectly, so we have to assume it can go higher.
1236 constexpr unsigned MaxStringByteLength = 32 * 4;
1237 uint8_t StringBytes[MaxStringByteLength];
1239 unsigned BytesDecoded = 0;
1240 while (!MangledName.consumeFront('@')) {
1241 assert(StringByteSize >= 1);
1242 StringBytes[BytesDecoded++] = demangleCharLiteral(MangledName);
1245 if (StringByteSize > BytesDecoded)
1246 Result->IsTruncated = true;
1248 unsigned CharBytes =
1249 guessCharByteSize(StringBytes, BytesDecoded, StringByteSize);
1250 assert(StringByteSize % CharBytes == 0);
1251 switch (CharBytes) {
1253 Result->Char = CharKind::Char;
1256 Result->Char = CharKind::Char16;
1259 Result->Char = CharKind::Char32;
1262 DEMANGLE_UNREACHABLE;
1264 const unsigned NumChars = BytesDecoded / CharBytes;
1265 for (unsigned CharIndex = 0; CharIndex < NumChars; ++CharIndex) {
1267 decodeMultiByteChar(StringBytes, CharIndex, CharBytes);
1268 if (CharIndex + 1 < NumChars || Result->IsTruncated)
1269 outputEscapedChar(OS, NextChar);
1274 ResultBuffer = OS.getBuffer();
1275 Result->DecodedString = copyString(ResultBuffer);
1276 std::free(ResultBuffer);
1284 // Returns MangledName's prefix before the first '@', or an error if
1285 // MangledName contains no '@' or the prefix has length 0.
1286 StringView Demangler::demangleSimpleString(StringView &MangledName,
1289 for (size_t i = 0; i < MangledName.size(); ++i) {
1290 if (MangledName[i] != '@')
1294 S = MangledName.substr(0, i);
1295 MangledName = MangledName.dropFront(i + 1);
1306 NamedIdentifierNode *
1307 Demangler::demangleAnonymousNamespaceName(StringView &MangledName) {
1308 assert(MangledName.startsWith("?A"));
1309 MangledName.consumeFront("?A");
1311 NamedIdentifierNode *Node = Arena.alloc<NamedIdentifierNode>();
1312 Node->Name = "`anonymous namespace'";
1313 size_t EndPos = MangledName.find('@');
1314 if (EndPos == StringView::npos) {
1318 StringView NamespaceKey = MangledName.substr(0, EndPos);
1319 memorizeString(NamespaceKey);
1320 MangledName = MangledName.substr(EndPos + 1);
1324 NamedIdentifierNode *
1325 Demangler::demangleLocallyScopedNamePiece(StringView &MangledName) {
1326 assert(startsWithLocalScopePattern(MangledName));
1328 NamedIdentifierNode *Identifier = Arena.alloc<NamedIdentifierNode>();
1329 MangledName.consumeFront('?');
1330 uint64_t Number = 0;
1331 bool IsNegative = false;
1332 std::tie(Number, IsNegative) = demangleNumber(MangledName);
1333 assert(!IsNegative);
1335 // One ? to terminate the number
1336 MangledName.consumeFront('?');
1339 Node *Scope = parse(MangledName);
1343 // Render the parent symbol's name into a buffer.
1345 if (!initializeOutputStream(nullptr, nullptr, OS, 1024))
1346 // FIXME: Propagate out-of-memory as an error?
1349 Scope->output(OS, OF_Default);
1351 OS << "::`" << Number << "'";
1353 char *Result = OS.getBuffer();
1354 Identifier->Name = copyString(Result);
1359 // Parses a type name in the form of A@B@C@@ which represents C::B::A.
1361 Demangler::demangleFullyQualifiedTypeName(StringView &MangledName) {
1362 IdentifierNode *Identifier = demangleUnqualifiedTypeName(MangledName, true);
1367 QualifiedNameNode *QN = demangleNameScopeChain(MangledName, Identifier);
1374 // Parses a symbol name in the form of A@B@C@@ which represents C::B::A.
1375 // Symbol names have slightly different rules regarding what can appear
1376 // so we separate out the implementations for flexibility.
1378 Demangler::demangleFullyQualifiedSymbolName(StringView &MangledName) {
1379 // This is the final component of a symbol name (i.e. the leftmost component
1380 // of a mangled name. Since the only possible template instantiation that
1381 // can appear in this context is a function template, and since those are
1382 // not saved for the purposes of name backreferences, only backref simple
1384 IdentifierNode *Identifier =
1385 demangleUnqualifiedSymbolName(MangledName, NBB_Simple);
1389 QualifiedNameNode *QN = demangleNameScopeChain(MangledName, Identifier);
1393 if (Identifier->kind() == NodeKind::StructorIdentifier) {
1394 if (QN->Components->Count < 2) {
1398 StructorIdentifierNode *SIN =
1399 static_cast<StructorIdentifierNode *>(Identifier);
1400 Node *ClassNode = QN->Components->Nodes[QN->Components->Count - 2];
1401 SIN->Class = static_cast<IdentifierNode *>(ClassNode);
1407 IdentifierNode *Demangler::demangleUnqualifiedTypeName(StringView &MangledName,
1409 // An inner-most name can be a back-reference, because a fully-qualified name
1410 // (e.g. Scope + Inner) can contain other fully qualified names inside of
1411 // them (for example template parameters), and these nested parameters can
1412 // refer to previously mangled types.
1413 if (startsWithDigit(MangledName))
1414 return demangleBackRefName(MangledName);
1416 if (MangledName.startsWith("?$"))
1417 return demangleTemplateInstantiationName(MangledName, NBB_Template);
1419 return demangleSimpleName(MangledName, Memorize);
1423 Demangler::demangleUnqualifiedSymbolName(StringView &MangledName,
1424 NameBackrefBehavior NBB) {
1425 if (startsWithDigit(MangledName))
1426 return demangleBackRefName(MangledName);
1427 if (MangledName.startsWith("?$"))
1428 return demangleTemplateInstantiationName(MangledName, NBB);
1429 if (MangledName.startsWith('?'))
1430 return demangleFunctionIdentifierCode(MangledName);
1431 return demangleSimpleName(MangledName, (NBB & NBB_Simple) != 0);
1434 IdentifierNode *Demangler::demangleNameScopePiece(StringView &MangledName) {
1435 if (startsWithDigit(MangledName))
1436 return demangleBackRefName(MangledName);
1438 if (MangledName.startsWith("?$"))
1439 return demangleTemplateInstantiationName(MangledName, NBB_Template);
1441 if (MangledName.startsWith("?A"))
1442 return demangleAnonymousNamespaceName(MangledName);
1444 if (startsWithLocalScopePattern(MangledName))
1445 return demangleLocallyScopedNamePiece(MangledName);
1447 return demangleSimpleName(MangledName, true);
1450 static NodeArrayNode *nodeListToNodeArray(ArenaAllocator &Arena, NodeList *Head,
1452 NodeArrayNode *N = Arena.alloc<NodeArrayNode>();
1454 N->Nodes = Arena.allocArray<Node *>(Count);
1455 for (size_t I = 0; I < Count; ++I) {
1456 N->Nodes[I] = Head->N;
1463 Demangler::demangleNameScopeChain(StringView &MangledName,
1464 IdentifierNode *UnqualifiedName) {
1465 NodeList *Head = Arena.alloc<NodeList>();
1467 Head->N = UnqualifiedName;
1470 while (!MangledName.consumeFront("@")) {
1472 NodeList *NewHead = Arena.alloc<NodeList>();
1473 NewHead->Next = Head;
1476 if (MangledName.empty()) {
1482 IdentifierNode *Elem = demangleNameScopePiece(MangledName);
1489 QualifiedNameNode *QN = Arena.alloc<QualifiedNameNode>();
1490 QN->Components = nodeListToNodeArray(Arena, Head, Count);
1494 FuncClass Demangler::demangleFunctionClass(StringView &MangledName) {
1495 switch (MangledName.popFront()) {
1497 return FuncClass(FC_ExternC | FC_NoParameterList);
1501 return FuncClass(FC_Private | FC_Far);
1503 return FuncClass(FC_Private | FC_Static);
1505 return FuncClass(FC_Private | FC_Static);
1507 return FuncClass(FC_Private | FC_Virtual);
1509 return FuncClass(FC_Private | FC_Virtual);
1511 return FuncClass(FC_Private | FC_StaticThisAdjust);
1513 return FuncClass(FC_Private | FC_StaticThisAdjust | FC_Far);
1515 return FuncClass(FC_Protected);
1517 return FuncClass(FC_Protected | FC_Far);
1519 return FuncClass(FC_Protected | FC_Static);
1521 return FuncClass(FC_Protected | FC_Static | FC_Far);
1523 return FuncClass(FC_Protected | FC_Virtual);
1525 return FuncClass(FC_Protected | FC_Virtual | FC_Far);
1527 return FuncClass(FC_Protected | FC_Virtual | FC_StaticThisAdjust);
1529 return FuncClass(FC_Protected | FC_Virtual | FC_StaticThisAdjust | FC_Far);
1531 return FuncClass(FC_Public);
1533 return FuncClass(FC_Public | FC_Far);
1535 return FuncClass(FC_Public | FC_Static);
1537 return FuncClass(FC_Public | FC_Static | FC_Far);
1539 return FuncClass(FC_Public | FC_Virtual);
1541 return FuncClass(FC_Public | FC_Virtual | FC_Far);
1543 return FuncClass(FC_Public | FC_Virtual | FC_StaticThisAdjust);
1545 return FuncClass(FC_Public | FC_Virtual | FC_StaticThisAdjust | FC_Far);
1547 return FuncClass(FC_Global);
1549 return FuncClass(FC_Global | FC_Far);
1551 FuncClass VFlag = FC_VirtualThisAdjust;
1552 if (MangledName.consumeFront('R'))
1553 VFlag = FuncClass(VFlag | FC_VirtualThisAdjustEx);
1555 switch (MangledName.popFront()) {
1557 return FuncClass(FC_Private | FC_Virtual | VFlag);
1559 return FuncClass(FC_Private | FC_Virtual | VFlag | FC_Far);
1561 return FuncClass(FC_Protected | FC_Virtual | VFlag);
1563 return FuncClass(FC_Protected | FC_Virtual | VFlag | FC_Far);
1565 return FuncClass(FC_Public | FC_Virtual | VFlag);
1567 return FuncClass(FC_Public | FC_Virtual | VFlag | FC_Far);
1576 CallingConv Demangler::demangleCallingConvention(StringView &MangledName) {
1577 switch (MangledName.popFront()) {
1580 return CallingConv::Cdecl;
1583 return CallingConv::Pascal;
1586 return CallingConv::Thiscall;
1589 return CallingConv::Stdcall;
1592 return CallingConv::Fastcall;
1595 return CallingConv::Clrcall;
1598 return CallingConv::Eabi;
1600 return CallingConv::Vectorcall;
1603 return CallingConv::None;
1606 StorageClass Demangler::demangleVariableStorageClass(StringView &MangledName) {
1607 assert(std::isdigit(MangledName.front()));
1609 switch (MangledName.popFront()) {
1611 return StorageClass::PrivateStatic;
1613 return StorageClass::ProtectedStatic;
1615 return StorageClass::PublicStatic;
1617 return StorageClass::Global;
1619 return StorageClass::FunctionLocalStatic;
1622 return StorageClass::None;
1625 std::pair<Qualifiers, bool>
1626 Demangler::demangleQualifiers(StringView &MangledName) {
1628 switch (MangledName.popFront()) {
1629 // Member qualifiers
1631 return std::make_pair(Q_None, true);
1633 return std::make_pair(Q_Const, true);
1635 return std::make_pair(Q_Volatile, true);
1637 return std::make_pair(Qualifiers(Q_Const | Q_Volatile), true);
1638 // Non-Member qualifiers
1640 return std::make_pair(Q_None, false);
1642 return std::make_pair(Q_Const, false);
1644 return std::make_pair(Q_Volatile, false);
1646 return std::make_pair(Qualifiers(Q_Const | Q_Volatile), false);
1649 return std::make_pair(Q_None, false);
1652 // <variable-type> ::= <type> <cvr-qualifiers>
1653 // ::= <type> <pointee-cvr-qualifiers> # pointers, references
1654 TypeNode *Demangler::demangleType(StringView &MangledName,
1655 QualifierMangleMode QMM) {
1656 Qualifiers Quals = Q_None;
1657 bool IsMember = false;
1658 if (QMM == QualifierMangleMode::Mangle) {
1659 std::tie(Quals, IsMember) = demangleQualifiers(MangledName);
1660 } else if (QMM == QualifierMangleMode::Result) {
1661 if (MangledName.consumeFront('?'))
1662 std::tie(Quals, IsMember) = demangleQualifiers(MangledName);
1665 TypeNode *Ty = nullptr;
1666 if (isTagType(MangledName))
1667 Ty = demangleClassType(MangledName);
1668 else if (isPointerType(MangledName)) {
1669 if (isMemberPointer(MangledName, Error))
1670 Ty = demangleMemberPointerType(MangledName);
1672 Ty = demanglePointerType(MangledName);
1675 } else if (isArrayType(MangledName))
1676 Ty = demangleArrayType(MangledName);
1677 else if (isFunctionType(MangledName)) {
1678 if (MangledName.consumeFront("$$A8@@"))
1679 Ty = demangleFunctionType(MangledName, true);
1681 assert(MangledName.startsWith("$$A6"));
1682 MangledName.consumeFront("$$A6");
1683 Ty = demangleFunctionType(MangledName, false);
1685 } else if (isCustomType(MangledName)) {
1686 Ty = demangleCustomType(MangledName);
1688 Ty = demanglePrimitiveType(MangledName);
1693 Ty->Quals = Qualifiers(Ty->Quals | Quals);
1697 bool Demangler::demangleThrowSpecification(StringView &MangledName) {
1698 if (MangledName.consumeFront("_E"))
1700 if (MangledName.consumeFront('Z'))
1707 FunctionSignatureNode *Demangler::demangleFunctionType(StringView &MangledName,
1708 bool HasThisQuals) {
1709 FunctionSignatureNode *FTy = Arena.alloc<FunctionSignatureNode>();
1712 FTy->Quals = demanglePointerExtQualifiers(MangledName);
1713 FTy->RefQualifier = demangleFunctionRefQualifier(MangledName);
1714 FTy->Quals = Qualifiers(FTy->Quals | demangleQualifiers(MangledName).first);
1717 // Fields that appear on both member and non-member functions.
1718 FTy->CallConvention = demangleCallingConvention(MangledName);
1720 // <return-type> ::= <type>
1721 // ::= @ # structors (they have no declared return type)
1722 bool IsStructor = MangledName.consumeFront('@');
1724 FTy->ReturnType = demangleType(MangledName, QualifierMangleMode::Result);
1726 FTy->Params = demangleFunctionParameterList(MangledName);
1728 FTy->IsNoexcept = demangleThrowSpecification(MangledName);
1733 FunctionSymbolNode *
1734 Demangler::demangleFunctionEncoding(StringView &MangledName) {
1735 FuncClass ExtraFlags = FC_None;
1736 if (MangledName.consumeFront("$$J0"))
1737 ExtraFlags = FC_ExternC;
1739 FuncClass FC = demangleFunctionClass(MangledName);
1740 FC = FuncClass(ExtraFlags | FC);
1742 FunctionSignatureNode *FSN = nullptr;
1743 ThunkSignatureNode *TTN = nullptr;
1744 if (FC & FC_StaticThisAdjust) {
1745 TTN = Arena.alloc<ThunkSignatureNode>();
1746 TTN->ThisAdjust.StaticOffset = demangleSigned(MangledName);
1747 } else if (FC & FC_VirtualThisAdjust) {
1748 TTN = Arena.alloc<ThunkSignatureNode>();
1749 if (FC & FC_VirtualThisAdjustEx) {
1750 TTN->ThisAdjust.VBPtrOffset = demangleSigned(MangledName);
1751 TTN->ThisAdjust.VBOffsetOffset = demangleSigned(MangledName);
1753 TTN->ThisAdjust.VtordispOffset = demangleSigned(MangledName);
1754 TTN->ThisAdjust.StaticOffset = demangleSigned(MangledName);
1757 if (FC & FC_NoParameterList) {
1758 // This is an extern "C" function whose full signature hasn't been mangled.
1759 // This happens when we need to mangle a local symbol inside of an extern
1761 FSN = Arena.alloc<FunctionSignatureNode>();
1763 bool HasThisQuals = !(FC & (FC_Global | FC_Static));
1764 FSN = demangleFunctionType(MangledName, HasThisQuals);
1767 *static_cast<FunctionSignatureNode *>(TTN) = *FSN;
1770 FSN->FunctionClass = FC;
1772 FunctionSymbolNode *Symbol = Arena.alloc<FunctionSymbolNode>();
1773 Symbol->Signature = FSN;
1777 CustomTypeNode *Demangler::demangleCustomType(StringView &MangledName) {
1778 assert(MangledName.startsWith('?'));
1779 MangledName.popFront();
1781 CustomTypeNode *CTN = Arena.alloc<CustomTypeNode>();
1782 CTN->Identifier = demangleUnqualifiedTypeName(MangledName, true);
1783 if (!MangledName.consumeFront('@'))
1790 // Reads a primitive type.
1791 PrimitiveTypeNode *Demangler::demanglePrimitiveType(StringView &MangledName) {
1792 if (MangledName.consumeFront("$$T"))
1793 return Arena.alloc<PrimitiveTypeNode>(PrimitiveKind::Nullptr);
1795 switch (MangledName.popFront()) {
1797 return Arena.alloc<PrimitiveTypeNode>(PrimitiveKind::Void);
1799 return Arena.alloc<PrimitiveTypeNode>(PrimitiveKind::Char);
1801 return Arena.alloc<PrimitiveTypeNode>(PrimitiveKind::Schar);
1803 return Arena.alloc<PrimitiveTypeNode>(PrimitiveKind::Uchar);
1805 return Arena.alloc<PrimitiveTypeNode>(PrimitiveKind::Short);
1807 return Arena.alloc<PrimitiveTypeNode>(PrimitiveKind::Ushort);
1809 return Arena.alloc<PrimitiveTypeNode>(PrimitiveKind::Int);
1811 return Arena.alloc<PrimitiveTypeNode>(PrimitiveKind::Uint);
1813 return Arena.alloc<PrimitiveTypeNode>(PrimitiveKind::Long);
1815 return Arena.alloc<PrimitiveTypeNode>(PrimitiveKind::Ulong);
1817 return Arena.alloc<PrimitiveTypeNode>(PrimitiveKind::Float);
1819 return Arena.alloc<PrimitiveTypeNode>(PrimitiveKind::Double);
1821 return Arena.alloc<PrimitiveTypeNode>(PrimitiveKind::Ldouble);
1823 if (MangledName.empty()) {
1827 switch (MangledName.popFront()) {
1829 return Arena.alloc<PrimitiveTypeNode>(PrimitiveKind::Bool);
1831 return Arena.alloc<PrimitiveTypeNode>(PrimitiveKind::Int64);
1833 return Arena.alloc<PrimitiveTypeNode>(PrimitiveKind::Uint64);
1835 return Arena.alloc<PrimitiveTypeNode>(PrimitiveKind::Wchar);
1837 return Arena.alloc<PrimitiveTypeNode>(PrimitiveKind::Char16);
1839 return Arena.alloc<PrimitiveTypeNode>(PrimitiveKind::Char32);
1848 TagTypeNode *Demangler::demangleClassType(StringView &MangledName) {
1849 TagTypeNode *TT = nullptr;
1851 switch (MangledName.popFront()) {
1853 TT = Arena.alloc<TagTypeNode>(TagKind::Union);
1856 TT = Arena.alloc<TagTypeNode>(TagKind::Struct);
1859 TT = Arena.alloc<TagTypeNode>(TagKind::Class);
1862 if (MangledName.popFront() != '4') {
1866 TT = Arena.alloc<TagTypeNode>(TagKind::Enum);
1872 TT->QualifiedName = demangleFullyQualifiedTypeName(MangledName);
1876 // <pointer-type> ::= E? <pointer-cvr-qualifiers> <ext-qualifiers> <type>
1877 // # the E is required for 64-bit non-static pointers
1878 PointerTypeNode *Demangler::demanglePointerType(StringView &MangledName) {
1879 PointerTypeNode *Pointer = Arena.alloc<PointerTypeNode>();
1881 std::tie(Pointer->Quals, Pointer->Affinity) =
1882 demanglePointerCVQualifiers(MangledName);
1884 if (MangledName.consumeFront("6")) {
1885 Pointer->Pointee = demangleFunctionType(MangledName, false);
1889 Qualifiers ExtQuals = demanglePointerExtQualifiers(MangledName);
1890 Pointer->Quals = Qualifiers(Pointer->Quals | ExtQuals);
1892 Pointer->Pointee = demangleType(MangledName, QualifierMangleMode::Mangle);
1896 PointerTypeNode *Demangler::demangleMemberPointerType(StringView &MangledName) {
1897 PointerTypeNode *Pointer = Arena.alloc<PointerTypeNode>();
1899 std::tie(Pointer->Quals, Pointer->Affinity) =
1900 demanglePointerCVQualifiers(MangledName);
1901 assert(Pointer->Affinity == PointerAffinity::Pointer);
1903 Qualifiers ExtQuals = demanglePointerExtQualifiers(MangledName);
1904 Pointer->Quals = Qualifiers(Pointer->Quals | ExtQuals);
1906 if (MangledName.consumeFront("8")) {
1907 Pointer->ClassParent = demangleFullyQualifiedTypeName(MangledName);
1908 Pointer->Pointee = demangleFunctionType(MangledName, true);
1910 Qualifiers PointeeQuals = Q_None;
1911 bool IsMember = false;
1912 std::tie(PointeeQuals, IsMember) = demangleQualifiers(MangledName);
1914 Pointer->ClassParent = demangleFullyQualifiedTypeName(MangledName);
1916 Pointer->Pointee = demangleType(MangledName, QualifierMangleMode::Drop);
1917 Pointer->Pointee->Quals = PointeeQuals;
1923 Qualifiers Demangler::demanglePointerExtQualifiers(StringView &MangledName) {
1924 Qualifiers Quals = Q_None;
1925 if (MangledName.consumeFront('E'))
1926 Quals = Qualifiers(Quals | Q_Pointer64);
1927 if (MangledName.consumeFront('I'))
1928 Quals = Qualifiers(Quals | Q_Restrict);
1929 if (MangledName.consumeFront('F'))
1930 Quals = Qualifiers(Quals | Q_Unaligned);
1935 ArrayTypeNode *Demangler::demangleArrayType(StringView &MangledName) {
1936 assert(MangledName.front() == 'Y');
1937 MangledName.popFront();
1940 bool IsNegative = false;
1941 std::tie(Rank, IsNegative) = demangleNumber(MangledName);
1942 if (IsNegative || Rank == 0) {
1947 ArrayTypeNode *ATy = Arena.alloc<ArrayTypeNode>();
1948 NodeList *Head = Arena.alloc<NodeList>();
1949 NodeList *Tail = Head;
1951 for (uint64_t I = 0; I < Rank; ++I) {
1953 std::tie(D, IsNegative) = demangleNumber(MangledName);
1954 if (Error || IsNegative) {
1958 Tail->N = Arena.alloc<IntegerLiteralNode>(D, IsNegative);
1960 Tail->Next = Arena.alloc<NodeList>();
1964 ATy->Dimensions = nodeListToNodeArray(Arena, Head, Rank);
1966 if (MangledName.consumeFront("$$C")) {
1967 bool IsMember = false;
1968 std::tie(ATy->Quals, IsMember) = demangleQualifiers(MangledName);
1975 ATy->ElementType = demangleType(MangledName, QualifierMangleMode::Drop);
1979 // Reads a function or a template parameters.
1981 Demangler::demangleFunctionParameterList(StringView &MangledName) {
1982 // Empty parameter list.
1983 if (MangledName.consumeFront('X'))
1986 NodeList *Head = Arena.alloc<NodeList>();
1987 NodeList **Current = &Head;
1989 while (!Error && !MangledName.startsWith('@') &&
1990 !MangledName.startsWith('Z')) {
1993 if (startsWithDigit(MangledName)) {
1994 size_t N = MangledName[0] - '0';
1995 if (N >= Backrefs.FunctionParamCount) {
1999 MangledName = MangledName.dropFront();
2001 *Current = Arena.alloc<NodeList>();
2002 (*Current)->N = Backrefs.FunctionParams[N];
2003 Current = &(*Current)->Next;
2007 size_t OldSize = MangledName.size();
2009 *Current = Arena.alloc<NodeList>();
2010 TypeNode *TN = demangleType(MangledName, QualifierMangleMode::Drop);
2016 size_t CharsConsumed = OldSize - MangledName.size();
2017 assert(CharsConsumed != 0);
2019 // Single-letter types are ignored for backreferences because memorizing
2020 // them doesn't save anything.
2021 if (Backrefs.FunctionParamCount <= 9 && CharsConsumed > 1)
2022 Backrefs.FunctionParams[Backrefs.FunctionParamCount++] = TN;
2024 Current = &(*Current)->Next;
2030 NodeArrayNode *NA = nodeListToNodeArray(Arena, Head, Count);
2031 // A non-empty parameter list is terminated by either 'Z' (variadic) parameter
2032 // list or '@' (non variadic). Careful not to consume "@Z", as in that case
2033 // the following Z could be a throw specifier.
2034 if (MangledName.consumeFront('@'))
2037 if (MangledName.consumeFront('Z')) {
2038 // This is a variadic parameter list. We probably need a variadic node to
2039 // append to the end.
2048 Demangler::demangleTemplateParameterList(StringView &MangledName) {
2050 NodeList **Current = &Head;
2053 while (!Error && !MangledName.startsWith('@')) {
2054 if (MangledName.consumeFront("$S") || MangledName.consumeFront("$$V") ||
2055 MangledName.consumeFront("$$$V") || MangledName.consumeFront("$$Z")) {
2056 // parameter pack separator
2062 // Template parameter lists don't participate in back-referencing.
2063 *Current = Arena.alloc<NodeList>();
2065 NodeList &TP = **Current;
2067 TemplateParameterReferenceNode *TPRN = nullptr;
2068 if (MangledName.consumeFront("$$Y")) {
2070 TP.N = demangleFullyQualifiedTypeName(MangledName);
2071 } else if (MangledName.consumeFront("$$B")) {
2073 TP.N = demangleType(MangledName, QualifierMangleMode::Drop);
2074 } else if (MangledName.consumeFront("$$C")) {
2075 // Type has qualifiers.
2076 TP.N = demangleType(MangledName, QualifierMangleMode::Mangle);
2077 } else if (MangledName.startsWith("$1") || MangledName.startsWith("$H") ||
2078 MangledName.startsWith("$I") || MangledName.startsWith("$J")) {
2079 // Pointer to member
2080 TP.N = TPRN = Arena.alloc<TemplateParameterReferenceNode>();
2081 TPRN->IsMemberPointer = true;
2083 MangledName = MangledName.dropFront();
2084 // 1 - single inheritance <name>
2085 // H - multiple inheritance <name> <number>
2086 // I - virtual inheritance <name> <number> <number> <number>
2087 // J - unspecified inheritance <name> <number> <number> <number>
2088 char InheritanceSpecifier = MangledName.popFront();
2089 SymbolNode *S = nullptr;
2090 if (MangledName.startsWith('?')) {
2091 S = parse(MangledName);
2092 memorizeIdentifier(S->Name->getUnqualifiedIdentifier());
2095 switch (InheritanceSpecifier) {
2097 TPRN->ThunkOffsets[TPRN->ThunkOffsetCount++] =
2098 demangleSigned(MangledName);
2099 DEMANGLE_FALLTHROUGH;
2101 TPRN->ThunkOffsets[TPRN->ThunkOffsetCount++] =
2102 demangleSigned(MangledName);
2103 DEMANGLE_FALLTHROUGH;
2105 TPRN->ThunkOffsets[TPRN->ThunkOffsetCount++] =
2106 demangleSigned(MangledName);
2107 DEMANGLE_FALLTHROUGH;
2114 TPRN->Affinity = PointerAffinity::Pointer;
2116 } else if (MangledName.startsWith("$E?")) {
2117 MangledName.consumeFront("$E");
2118 // Reference to symbol
2119 TP.N = TPRN = Arena.alloc<TemplateParameterReferenceNode>();
2120 TPRN->Symbol = parse(MangledName);
2121 TPRN->Affinity = PointerAffinity::Reference;
2122 } else if (MangledName.startsWith("$F") || MangledName.startsWith("$G")) {
2123 TP.N = TPRN = Arena.alloc<TemplateParameterReferenceNode>();
2125 // Data member pointer.
2126 MangledName = MangledName.dropFront();
2127 char InheritanceSpecifier = MangledName.popFront();
2129 switch (InheritanceSpecifier) {
2131 TPRN->ThunkOffsets[TPRN->ThunkOffsetCount++] =
2132 demangleSigned(MangledName);
2133 DEMANGLE_FALLTHROUGH;
2135 TPRN->ThunkOffsets[TPRN->ThunkOffsetCount++] =
2136 demangleSigned(MangledName);
2137 TPRN->ThunkOffsets[TPRN->ThunkOffsetCount++] =
2138 demangleSigned(MangledName);
2139 DEMANGLE_FALLTHROUGH;
2146 TPRN->IsMemberPointer = true;
2148 } else if (MangledName.consumeFront("$0")) {
2149 // Integral non-type template parameter
2150 bool IsNegative = false;
2152 std::tie(Value, IsNegative) = demangleNumber(MangledName);
2154 TP.N = Arena.alloc<IntegerLiteralNode>(Value, IsNegative);
2156 TP.N = demangleType(MangledName, QualifierMangleMode::Drop);
2167 // Template parameter lists cannot be variadic, so it can only be terminated
2169 if (MangledName.consumeFront('@'))
2170 return nodeListToNodeArray(Arena, Head, Count);
2175 void Demangler::dumpBackReferences() {
2176 std::printf("%d function parameter backreferences\n",
2177 (int)Backrefs.FunctionParamCount);
2179 // Create an output stream so we can render each type.
2181 if (!initializeOutputStream(nullptr, nullptr, OS, 1024))
2183 for (size_t I = 0; I < Backrefs.FunctionParamCount; ++I) {
2184 OS.setCurrentPosition(0);
2186 TypeNode *T = Backrefs.FunctionParams[I];
2187 T->output(OS, OF_Default);
2189 std::printf(" [%d] - %.*s\n", (int)I, (int)OS.getCurrentPosition(),
2192 std::free(OS.getBuffer());
2194 if (Backrefs.FunctionParamCount > 0)
2196 std::printf("%d name backreferences\n", (int)Backrefs.NamesCount);
2197 for (size_t I = 0; I < Backrefs.NamesCount; ++I) {
2198 std::printf(" [%d] - %.*s\n", (int)I, (int)Backrefs.Names[I]->Name.size(),
2199 Backrefs.Names[I]->Name.begin());
2201 if (Backrefs.NamesCount > 0)
2205 char *llvm::microsoftDemangle(const char *MangledName, char *Buf, size_t *N,
2206 int *Status, MSDemangleFlags Flags) {
2207 int InternalStatus = demangle_success;
2211 StringView Name{MangledName};
2212 SymbolNode *AST = D.parse(Name);
2214 if (Flags & MSDF_DumpBackrefs)
2215 D.dumpBackReferences();
2218 InternalStatus = demangle_invalid_mangled_name;
2219 else if (!initializeOutputStream(Buf, N, S, 1024))
2220 InternalStatus = demangle_memory_alloc_failure;
2222 AST->output(S, OF_Default);
2225 *N = S.getCurrentPosition();
2226 Buf = S.getBuffer();
2230 *Status = InternalStatus;
2231 return InternalStatus == demangle_success ? Buf : nullptr;