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MicrosoftDemangle.cpp
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//===- MicrosoftDemangle.cpp ----------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file defines a demangler for MSVC-style mangled symbols.
//
// This file has no dependencies on the rest of LLVM so that it can be
// easily reused in other programs such as libcxxabi.
//
//===----------------------------------------------------------------------===//
#include "llvm/Demangle/MicrosoftDemangle.h"
#include "llvm/Demangle/Demangle.h"
#include "llvm/Demangle/MicrosoftDemangleNodes.h"
#include "llvm/Demangle/DemangleConfig.h"
#include "llvm/Demangle/StringView.h"
#include "llvm/Demangle/Utility.h"
#include <array>
#include <cctype>
#include <cstdio>
#include <tuple>
using namespace llvm;
using namespace ms_demangle;
static bool startsWithDigit(StringView S) {
return !S.empty() && std::isdigit(S.front());
}
struct NodeList {
Node *N = nullptr;
NodeList *Next = nullptr;
};
static bool isMemberPointer(StringView MangledName, bool &Error) {
Error = false;
switch (MangledName.popFront()) {
case '$':
// This is probably an rvalue reference (e.g. $$Q), and you cannot have an
// rvalue reference to a member.
return false;
case 'A':
// 'A' indicates a reference, and you cannot have a reference to a member
// function or member.
return false;
case 'P':
case 'Q':
case 'R':
case 'S':
// These 4 values indicate some kind of pointer, but we still don't know
// what.
break;
default:
Error = true;
return false;
}
// If it starts with a number, then 6 indicates a non-member function
// pointer, and 8 indicates a member function pointer.
if (startsWithDigit(MangledName)) {
if (MangledName[0] != '6' && MangledName[0] != '8') {
Error = true;
return false;
}
return (MangledName[0] == '8');
}
// Remove ext qualifiers since those can appear on either type and are
// therefore not indicative.
MangledName.consumeFront('E'); // 64-bit
MangledName.consumeFront('I'); // restrict
MangledName.consumeFront('F'); // unaligned
if (MangledName.empty()) {
Error = true;
return false;
}
// The next value should be either ABCD (non-member) or QRST (member).
switch (MangledName.front()) {
case 'A':
case 'B':
case 'C':
case 'D':
return false;
case 'Q':
case 'R':
case 'S':
case 'T':
return true;
default:
Error = true;
return false;
}
}
static SpecialIntrinsicKind
consumeSpecialIntrinsicKind(StringView &MangledName) {
if (MangledName.consumeFront("?_7"))
return SpecialIntrinsicKind::Vftable;
if (MangledName.consumeFront("?_8"))
return SpecialIntrinsicKind::Vbtable;
if (MangledName.consumeFront("?_9"))
return SpecialIntrinsicKind::VcallThunk;
if (MangledName.consumeFront("?_A"))
return SpecialIntrinsicKind::Typeof;
if (MangledName.consumeFront("?_B"))
return SpecialIntrinsicKind::LocalStaticGuard;
if (MangledName.consumeFront("?_C"))
return SpecialIntrinsicKind::StringLiteralSymbol;
if (MangledName.consumeFront("?_P"))
return SpecialIntrinsicKind::UdtReturning;
if (MangledName.consumeFront("?_R0"))
return SpecialIntrinsicKind::RttiTypeDescriptor;
if (MangledName.consumeFront("?_R1"))
return SpecialIntrinsicKind::RttiBaseClassDescriptor;
if (MangledName.consumeFront("?_R2"))
return SpecialIntrinsicKind::RttiBaseClassArray;
if (MangledName.consumeFront("?_R3"))
return SpecialIntrinsicKind::RttiClassHierarchyDescriptor;
if (MangledName.consumeFront("?_R4"))
return SpecialIntrinsicKind::RttiCompleteObjLocator;
if (MangledName.consumeFront("?_S"))
return SpecialIntrinsicKind::LocalVftable;
if (MangledName.consumeFront("?__E"))
return SpecialIntrinsicKind::DynamicInitializer;
if (MangledName.consumeFront("?__F"))
return SpecialIntrinsicKind::DynamicAtexitDestructor;
if (MangledName.consumeFront("?__J"))
return SpecialIntrinsicKind::LocalStaticThreadGuard;
return SpecialIntrinsicKind::None;
}
static bool startsWithLocalScopePattern(StringView S) {
if (!S.consumeFront('?'))
return false;
if (S.size() < 2)
return false;
size_t End = S.find('?');
if (End == StringView::npos)
return false;
StringView Candidate = S.substr(0, End);
if (Candidate.empty())
return false;
// \?[0-9]\?
// ?@? is the discriminator 0.
if (Candidate.size() == 1)
return Candidate[0] == '@' || (Candidate[0] >= '0' && Candidate[0] <= '9');
// If it's not 0-9, then it's an encoded number terminated with an @
if (Candidate.back() != '@')
return false;
Candidate = Candidate.dropBack();
// An encoded number starts with B-P and all subsequent digits are in A-P.
// Note that the reason the first digit cannot be A is two fold. First, it
// would create an ambiguity with ?A which delimits the beginning of an
// anonymous namespace. Second, A represents 0, and you don't start a multi
// digit number with a leading 0. Presumably the anonymous namespace
// ambiguity is also why single digit encoded numbers use 0-9 rather than A-J.
if (Candidate[0] < 'B' || Candidate[0] > 'P')
return false;
Candidate = Candidate.dropFront();
while (!Candidate.empty()) {
if (Candidate[0] < 'A' || Candidate[0] > 'P')
return false;
Candidate = Candidate.dropFront();
}
return true;
}
static bool isTagType(StringView S) {
switch (S.front()) {
case 'T': // union
case 'U': // struct
case 'V': // class
case 'W': // enum
return true;
}
return false;
}
static bool isCustomType(StringView S) { return S[0] == '?'; }
static bool isPointerType(StringView S) {
if (S.startsWith("$$Q")) // foo &&
return true;
switch (S.front()) {
case 'A': // foo &
case 'P': // foo *
case 'Q': // foo *const
case 'R': // foo *volatile
case 'S': // foo *const volatile
return true;
}
return false;
}
static bool isArrayType(StringView S) { return S[0] == 'Y'; }
static bool isFunctionType(StringView S) {
return S.startsWith("$$A8@@") || S.startsWith("$$A6");
}
static FunctionRefQualifier
demangleFunctionRefQualifier(StringView &MangledName) {
if (MangledName.consumeFront('G'))
return FunctionRefQualifier::Reference;
else if (MangledName.consumeFront('H'))
return FunctionRefQualifier::RValueReference;
return FunctionRefQualifier::None;
}
static std::pair<Qualifiers, PointerAffinity>
demanglePointerCVQualifiers(StringView &MangledName) {
if (MangledName.consumeFront("$$Q"))
return std::make_pair(Q_None, PointerAffinity::RValueReference);
switch (MangledName.popFront()) {
case 'A':
return std::make_pair(Q_None, PointerAffinity::Reference);
case 'P':
return std::make_pair(Q_None, PointerAffinity::Pointer);
case 'Q':
return std::make_pair(Q_Const, PointerAffinity::Pointer);
case 'R':
return std::make_pair(Q_Volatile, PointerAffinity::Pointer);
case 'S':
return std::make_pair(Qualifiers(Q_Const | Q_Volatile),
PointerAffinity::Pointer);
default:
assert(false && "Ty is not a pointer type!");
}
return std::make_pair(Q_None, PointerAffinity::Pointer);
}
StringView Demangler::copyString(StringView Borrowed) {
char *Stable = Arena.allocUnalignedBuffer(Borrowed.size() + 1);
std::strcpy(Stable, Borrowed.begin());
return {Stable, Borrowed.size()};
}
SpecialTableSymbolNode *
Demangler::demangleSpecialTableSymbolNode(StringView &MangledName,
SpecialIntrinsicKind K) {
NamedIdentifierNode *NI = Arena.alloc<NamedIdentifierNode>();
switch (K) {
case SpecialIntrinsicKind::Vftable:
NI->Name = "`vftable'";
break;
case SpecialIntrinsicKind::Vbtable:
NI->Name = "`vbtable'";
break;
case SpecialIntrinsicKind::LocalVftable:
NI->Name = "`local vftable'";
break;
case SpecialIntrinsicKind::RttiCompleteObjLocator:
NI->Name = "`RTTI Complete Object Locator'";
break;
default:
DEMANGLE_UNREACHABLE;
}
QualifiedNameNode *QN = demangleNameScopeChain(MangledName, NI);
SpecialTableSymbolNode *STSN = Arena.alloc<SpecialTableSymbolNode>();
STSN->Name = QN;
bool IsMember = false;
char Front = MangledName.popFront();
if (Front != '6' && Front != '7') {
Error = true;
return nullptr;
}
std::tie(STSN->Quals, IsMember) = demangleQualifiers(MangledName);
if (!MangledName.consumeFront('@'))
STSN->TargetName = demangleFullyQualifiedTypeName(MangledName);
return STSN;
}
LocalStaticGuardVariableNode *
Demangler::demangleLocalStaticGuard(StringView &MangledName) {
LocalStaticGuardIdentifierNode *LSGI =
Arena.alloc<LocalStaticGuardIdentifierNode>();
QualifiedNameNode *QN = demangleNameScopeChain(MangledName, LSGI);
LocalStaticGuardVariableNode *LSGVN =
Arena.alloc<LocalStaticGuardVariableNode>();
LSGVN->Name = QN;
if (MangledName.consumeFront("4IA"))
LSGVN->IsVisible = false;
else if (MangledName.consumeFront("5"))
LSGVN->IsVisible = true;
else {
Error = true;
return nullptr;
}
if (!MangledName.empty())
LSGI->ScopeIndex = demangleUnsigned(MangledName);
return LSGVN;
}
static NamedIdentifierNode *synthesizeNamedIdentifier(ArenaAllocator &Arena,
StringView Name) {
NamedIdentifierNode *Id = Arena.alloc<NamedIdentifierNode>();
Id->Name = Name;
return Id;
}
static QualifiedNameNode *synthesizeQualifiedName(ArenaAllocator &Arena,
IdentifierNode *Identifier) {
QualifiedNameNode *QN = Arena.alloc<QualifiedNameNode>();
QN->Components = Arena.alloc<NodeArrayNode>();
QN->Components->Count = 1;
QN->Components->Nodes = Arena.allocArray<Node *>(1);
QN->Components->Nodes[0] = Identifier;
return QN;
}
static QualifiedNameNode *synthesizeQualifiedName(ArenaAllocator &Arena,
StringView Name) {
NamedIdentifierNode *Id = synthesizeNamedIdentifier(Arena, Name);
return synthesizeQualifiedName(Arena, Id);
}
static VariableSymbolNode *synthesizeVariable(ArenaAllocator &Arena,
TypeNode *Type,
StringView VariableName) {
VariableSymbolNode *VSN = Arena.alloc<VariableSymbolNode>();
VSN->Type = Type;
VSN->Name = synthesizeQualifiedName(Arena, VariableName);
return VSN;
}
VariableSymbolNode *Demangler::demangleUntypedVariable(
ArenaAllocator &Arena, StringView &MangledName, StringView VariableName) {
NamedIdentifierNode *NI = synthesizeNamedIdentifier(Arena, VariableName);
QualifiedNameNode *QN = demangleNameScopeChain(MangledName, NI);
VariableSymbolNode *VSN = Arena.alloc<VariableSymbolNode>();
VSN->Name = QN;
if (MangledName.consumeFront("8"))
return VSN;
Error = true;
return nullptr;
}
VariableSymbolNode *
Demangler::demangleRttiBaseClassDescriptorNode(ArenaAllocator &Arena,
StringView &MangledName) {
RttiBaseClassDescriptorNode *RBCDN =
Arena.alloc<RttiBaseClassDescriptorNode>();
RBCDN->NVOffset = demangleUnsigned(MangledName);
RBCDN->VBPtrOffset = demangleSigned(MangledName);
RBCDN->VBTableOffset = demangleUnsigned(MangledName);
RBCDN->Flags = demangleUnsigned(MangledName);
if (Error)
return nullptr;
VariableSymbolNode *VSN = Arena.alloc<VariableSymbolNode>();
VSN->Name = demangleNameScopeChain(MangledName, RBCDN);
MangledName.consumeFront('8');
return VSN;
}
FunctionSymbolNode *Demangler::demangleInitFiniStub(StringView &MangledName,
bool IsDestructor) {
DynamicStructorIdentifierNode *DSIN =
Arena.alloc<DynamicStructorIdentifierNode>();
DSIN->IsDestructor = IsDestructor;
bool IsKnownStaticDataMember = false;
if (MangledName.consumeFront('?'))
IsKnownStaticDataMember = true;
SymbolNode *Symbol = demangleDeclarator(MangledName);
if (Error)
return nullptr;
FunctionSymbolNode *FSN = nullptr;
if (Symbol->kind() == NodeKind::VariableSymbol) {
DSIN->Variable = static_cast<VariableSymbolNode *>(Symbol);
// Older versions of clang mangled this type of symbol incorrectly. They
// would omit the leading ? and they would only emit a single @ at the end.
// The correct mangling is a leading ? and 2 trailing @ signs. Handle
// both cases.
int AtCount = IsKnownStaticDataMember ? 2 : 1;
for (int I = 0; I < AtCount; ++I) {
if (MangledName.consumeFront('@'))
continue;
Error = true;
return nullptr;
}
FSN = demangleFunctionEncoding(MangledName);
if (FSN)
FSN->Name = synthesizeQualifiedName(Arena, DSIN);
} else {
if (IsKnownStaticDataMember) {
// This was supposed to be a static data member, but we got a function.
Error = true;
return nullptr;
}
FSN = static_cast<FunctionSymbolNode *>(Symbol);
DSIN->Name = Symbol->Name;
FSN->Name = synthesizeQualifiedName(Arena, DSIN);
}
return FSN;
}
SymbolNode *Demangler::demangleSpecialIntrinsic(StringView &MangledName) {
SpecialIntrinsicKind SIK = consumeSpecialIntrinsicKind(MangledName);
if (SIK == SpecialIntrinsicKind::None)
return nullptr;
switch (SIK) {
case SpecialIntrinsicKind::StringLiteralSymbol:
return demangleStringLiteral(MangledName);
case SpecialIntrinsicKind::Vftable:
case SpecialIntrinsicKind::Vbtable:
case SpecialIntrinsicKind::LocalVftable:
case SpecialIntrinsicKind::RttiCompleteObjLocator:
return demangleSpecialTableSymbolNode(MangledName, SIK);
case SpecialIntrinsicKind::VcallThunk:
return demangleVcallThunkNode(MangledName);
case SpecialIntrinsicKind::LocalStaticGuard:
return demangleLocalStaticGuard(MangledName);
case SpecialIntrinsicKind::RttiTypeDescriptor: {
TypeNode *T = demangleType(MangledName, QualifierMangleMode::Result);
if (Error)
break;
if (!MangledName.consumeFront("@8"))
break;
if (!MangledName.empty())
break;
return synthesizeVariable(Arena, T, "`RTTI Type Descriptor'");
}
case SpecialIntrinsicKind::RttiBaseClassArray:
return demangleUntypedVariable(Arena, MangledName,
"`RTTI Base Class Array'");
case SpecialIntrinsicKind::RttiClassHierarchyDescriptor:
return demangleUntypedVariable(Arena, MangledName,
"`RTTI Class Hierarchy Descriptor'");
case SpecialIntrinsicKind::RttiBaseClassDescriptor:
return demangleRttiBaseClassDescriptorNode(Arena, MangledName);
case SpecialIntrinsicKind::DynamicInitializer:
return demangleInitFiniStub(MangledName, false);
case SpecialIntrinsicKind::DynamicAtexitDestructor:
return demangleInitFiniStub(MangledName, true);
default:
break;
}
Error = true;
return nullptr;
}
IdentifierNode *
Demangler::demangleFunctionIdentifierCode(StringView &MangledName) {
assert(MangledName.startsWith('?'));
MangledName = MangledName.dropFront();
if (MangledName.empty()) {
Error = true;
return nullptr;
}
if (MangledName.consumeFront("__"))
return demangleFunctionIdentifierCode(
MangledName, FunctionIdentifierCodeGroup::DoubleUnder);
if (MangledName.consumeFront("_"))
return demangleFunctionIdentifierCode(MangledName,
FunctionIdentifierCodeGroup::Under);
return demangleFunctionIdentifierCode(MangledName,
FunctionIdentifierCodeGroup::Basic);
}
StructorIdentifierNode *
Demangler::demangleStructorIdentifier(StringView &MangledName,
bool IsDestructor) {
StructorIdentifierNode *N = Arena.alloc<StructorIdentifierNode>();
N->IsDestructor = IsDestructor;
return N;
}
ConversionOperatorIdentifierNode *
Demangler::demangleConversionOperatorIdentifier(StringView &MangledName) {
ConversionOperatorIdentifierNode *N =
Arena.alloc<ConversionOperatorIdentifierNode>();
return N;
}
LiteralOperatorIdentifierNode *
Demangler::demangleLiteralOperatorIdentifier(StringView &MangledName) {
LiteralOperatorIdentifierNode *N =
Arena.alloc<LiteralOperatorIdentifierNode>();
N->Name = demangleSimpleString(MangledName, false);
return N;
}
static IntrinsicFunctionKind
translateIntrinsicFunctionCode(char CH, FunctionIdentifierCodeGroup Group) {
// Not all ? identifiers are intrinsics *functions*. This function only maps
// operator codes for the special functions, all others are handled elsewhere,
// hence the IFK::None entries in the table.
using IFK = IntrinsicFunctionKind;
static IFK Basic[36] = {
IFK::None, // ?0 # Foo::Foo()
IFK::None, // ?1 # Foo::~Foo()
IFK::New, // ?2 # operator new
IFK::Delete, // ?3 # operator delete
IFK::Assign, // ?4 # operator=
IFK::RightShift, // ?5 # operator>>
IFK::LeftShift, // ?6 # operator<<
IFK::LogicalNot, // ?7 # operator!
IFK::Equals, // ?8 # operator==
IFK::NotEquals, // ?9 # operator!=
IFK::ArraySubscript, // ?A # operator[]
IFK::None, // ?B # Foo::operator <type>()
IFK::Pointer, // ?C # operator->
IFK::Dereference, // ?D # operator*
IFK::Increment, // ?E # operator++
IFK::Decrement, // ?F # operator--
IFK::Minus, // ?G # operator-
IFK::Plus, // ?H # operator+
IFK::BitwiseAnd, // ?I # operator&
IFK::MemberPointer, // ?J # operator->*
IFK::Divide, // ?K # operator/
IFK::Modulus, // ?L # operator%
IFK::LessThan, // ?M operator<
IFK::LessThanEqual, // ?N operator<=
IFK::GreaterThan, // ?O operator>
IFK::GreaterThanEqual, // ?P operator>=
IFK::Comma, // ?Q operator,
IFK::Parens, // ?R operator()
IFK::BitwiseNot, // ?S operator~
IFK::BitwiseXor, // ?T operator^
IFK::BitwiseOr, // ?U operator|
IFK::LogicalAnd, // ?V operator&&
IFK::LogicalOr, // ?W operator||
IFK::TimesEqual, // ?X operator*=
IFK::PlusEqual, // ?Y operator+=
IFK::MinusEqual, // ?Z operator-=
};
static IFK Under[36] = {
IFK::DivEqual, // ?_0 operator/=
IFK::ModEqual, // ?_1 operator%=
IFK::RshEqual, // ?_2 operator>>=
IFK::LshEqual, // ?_3 operator<<=
IFK::BitwiseAndEqual, // ?_4 operator&=
IFK::BitwiseOrEqual, // ?_5 operator|=
IFK::BitwiseXorEqual, // ?_6 operator^=
IFK::None, // ?_7 # vftable
IFK::None, // ?_8 # vbtable
IFK::None, // ?_9 # vcall
IFK::None, // ?_A # typeof
IFK::None, // ?_B # local static guard
IFK::None, // ?_C # string literal
IFK::VbaseDtor, // ?_D # vbase destructor
IFK::VecDelDtor, // ?_E # vector deleting destructor
IFK::DefaultCtorClosure, // ?_F # default constructor closure
IFK::ScalarDelDtor, // ?_G # scalar deleting destructor
IFK::VecCtorIter, // ?_H # vector constructor iterator
IFK::VecDtorIter, // ?_I # vector destructor iterator
IFK::VecVbaseCtorIter, // ?_J # vector vbase constructor iterator
IFK::VdispMap, // ?_K # virtual displacement map
IFK::EHVecCtorIter, // ?_L # eh vector constructor iterator
IFK::EHVecDtorIter, // ?_M # eh vector destructor iterator
IFK::EHVecVbaseCtorIter, // ?_N # eh vector vbase constructor iterator
IFK::CopyCtorClosure, // ?_O # copy constructor closure
IFK::None, // ?_P<name> # udt returning <name>
IFK::None, // ?_Q # <unknown>
IFK::None, // ?_R0 - ?_R4 # RTTI Codes
IFK::None, // ?_S # local vftable
IFK::LocalVftableCtorClosure, // ?_T # local vftable constructor closure
IFK::ArrayNew, // ?_U operator new[]
IFK::ArrayDelete, // ?_V operator delete[]
IFK::None, // ?_W <unused>
IFK::None, // ?_X <unused>
IFK::None, // ?_Y <unused>
IFK::None, // ?_Z <unused>
};
static IFK DoubleUnder[36] = {
IFK::None, // ?__0 <unused>
IFK::None, // ?__1 <unused>
IFK::None, // ?__2 <unused>
IFK::None, // ?__3 <unused>
IFK::None, // ?__4 <unused>
IFK::None, // ?__5 <unused>
IFK::None, // ?__6 <unused>
IFK::None, // ?__7 <unused>
IFK::None, // ?__8 <unused>
IFK::None, // ?__9 <unused>
IFK::ManVectorCtorIter, // ?__A managed vector ctor iterator
IFK::ManVectorDtorIter, // ?__B managed vector dtor iterator
IFK::EHVectorCopyCtorIter, // ?__C EH vector copy ctor iterator
IFK::EHVectorVbaseCopyCtorIter, // ?__D EH vector vbase copy ctor iter
IFK::None, // ?__E dynamic initializer for `T'
IFK::None, // ?__F dynamic atexit destructor for `T'
IFK::VectorCopyCtorIter, // ?__G vector copy constructor iter
IFK::VectorVbaseCopyCtorIter, // ?__H vector vbase copy ctor iter
IFK::ManVectorVbaseCopyCtorIter, // ?__I managed vector vbase copy ctor
// iter
IFK::None, // ?__J local static thread guard
IFK::None, // ?__K operator ""_name
IFK::CoAwait, // ?__L co_await
IFK::None, // ?__M <unused>
IFK::None, // ?__N <unused>
IFK::None, // ?__O <unused>
IFK::None, // ?__P <unused>
IFK::None, // ?__Q <unused>
IFK::None, // ?__R <unused>
IFK::None, // ?__S <unused>
IFK::None, // ?__T <unused>
IFK::None, // ?__U <unused>
IFK::None, // ?__V <unused>
IFK::None, // ?__W <unused>
IFK::None, // ?__X <unused>
IFK::None, // ?__Y <unused>
IFK::None, // ?__Z <unused>
};
int Index = (CH >= '0' && CH <= '9') ? (CH - '0') : (CH - 'A' + 10);
switch (Group) {
case FunctionIdentifierCodeGroup::Basic:
return Basic[Index];
case FunctionIdentifierCodeGroup::Under:
return Under[Index];
case FunctionIdentifierCodeGroup::DoubleUnder:
return DoubleUnder[Index];
}
DEMANGLE_UNREACHABLE;
}
IdentifierNode *
Demangler::demangleFunctionIdentifierCode(StringView &MangledName,
FunctionIdentifierCodeGroup Group) {
assert(!MangledName.empty());
switch (Group) {
case FunctionIdentifierCodeGroup::Basic:
switch (char CH = MangledName.popFront()) {
case '0':
case '1':
return demangleStructorIdentifier(MangledName, CH == '1');
case 'B':
return demangleConversionOperatorIdentifier(MangledName);
default:
return Arena.alloc<IntrinsicFunctionIdentifierNode>(
translateIntrinsicFunctionCode(CH, Group));
}
break;
case FunctionIdentifierCodeGroup::Under:
return Arena.alloc<IntrinsicFunctionIdentifierNode>(
translateIntrinsicFunctionCode(MangledName.popFront(), Group));
case FunctionIdentifierCodeGroup::DoubleUnder:
switch (char CH = MangledName.popFront()) {
case 'K':
return demangleLiteralOperatorIdentifier(MangledName);
default:
return Arena.alloc<IntrinsicFunctionIdentifierNode>(
translateIntrinsicFunctionCode(CH, Group));
}
}
// No Mangling Yet: Spaceship, // operator<=>
return nullptr;
}
SymbolNode *Demangler::demangleEncodedSymbol(StringView &MangledName,
QualifiedNameNode *Name) {
if (MangledName.empty()) {
Error = true;
return nullptr;
}
// Read a variable.
switch (MangledName.front()) {
case '0':
case '1':
case '2':
case '3':
case '4': {
StorageClass SC = demangleVariableStorageClass(MangledName);
return demangleVariableEncoding(MangledName, SC);
}
}
FunctionSymbolNode *FSN = demangleFunctionEncoding(MangledName);
IdentifierNode *UQN = Name->getUnqualifiedIdentifier();
if (UQN->kind() == NodeKind::ConversionOperatorIdentifier) {
ConversionOperatorIdentifierNode *COIN =
static_cast<ConversionOperatorIdentifierNode *>(UQN);
if (FSN)
COIN->TargetType = FSN->Signature->ReturnType;
}
return FSN;
}
SymbolNode *Demangler::demangleDeclarator(StringView &MangledName) {
// What follows is a main symbol name. This may include namespaces or class
// back references.
QualifiedNameNode *QN = demangleFullyQualifiedSymbolName(MangledName);
if (Error)
return nullptr;
SymbolNode *Symbol = demangleEncodedSymbol(MangledName, QN);
if (Error)
return nullptr;
Symbol->Name = QN;
IdentifierNode *UQN = QN->getUnqualifiedIdentifier();
if (UQN->kind() == NodeKind::ConversionOperatorIdentifier) {
ConversionOperatorIdentifierNode *COIN =
static_cast<ConversionOperatorIdentifierNode *>(UQN);
if (!COIN->TargetType) {
Error = true;
return nullptr;
}
}
return Symbol;
}
// Parser entry point.
SymbolNode *Demangler::parse(StringView &MangledName) {
// We can't demangle MD5 names, just output them as-is.
// Also, MSVC-style mangled symbols must start with '?'.
if (MangledName.startsWith("??@")) {
// This is an MD5 mangled name. We can't demangle it, just return the
// mangled name.
SymbolNode *S = Arena.alloc<SymbolNode>(NodeKind::Md5Symbol);
S->Name = synthesizeQualifiedName(Arena, MangledName);
return S;
}
if (!MangledName.startsWith('?')) {
Error = true;
return nullptr;
}
MangledName.consumeFront('?');
// ?$ is a template instantiation, but all other names that start with ? are
// operators / special names.
if (SymbolNode *SI = demangleSpecialIntrinsic(MangledName))
return SI;
return demangleDeclarator(MangledName);
}
TagTypeNode *Demangler::parseTagUniqueName(StringView &MangledName) {
if (!MangledName.consumeFront(".?A"))
return nullptr;
MangledName.consumeFront(".?A");
if (MangledName.empty())
return nullptr;
return demangleClassType(MangledName);
}
// <type-encoding> ::= <storage-class> <variable-type>
// <storage-class> ::= 0 # private static member
// ::= 1 # protected static member
// ::= 2 # public static member
// ::= 3 # global
// ::= 4 # static local
VariableSymbolNode *Demangler::demangleVariableEncoding(StringView &MangledName,
StorageClass SC) {
VariableSymbolNode *VSN = Arena.alloc<VariableSymbolNode>();
VSN->Type = demangleType(MangledName, QualifierMangleMode::Drop);
VSN->SC = SC;
if (Error)
return nullptr;
// <variable-type> ::= <type> <cvr-qualifiers>
// ::= <type> <pointee-cvr-qualifiers> # pointers, references
switch (VSN->Type->kind()) {
case NodeKind::PointerType: {
PointerTypeNode *PTN = static_cast<PointerTypeNode *>(VSN->Type);
Qualifiers ExtraChildQuals = Q_None;
PTN->Quals = Qualifiers(VSN->Type->Quals |
demanglePointerExtQualifiers(MangledName));
bool IsMember = false;
std::tie(ExtraChildQuals, IsMember) = demangleQualifiers(MangledName);
if (PTN->ClassParent) {
QualifiedNameNode *BackRefName =
demangleFullyQualifiedTypeName(MangledName);
(void)BackRefName;
}
PTN->Pointee->Quals = Qualifiers(PTN->Pointee->Quals | ExtraChildQuals);
break;
}
default:
VSN->Type->Quals = demangleQualifiers(MangledName).first;
break;
}
return VSN;
}
// Sometimes numbers are encoded in mangled symbols. For example,
// "int (*x)[20]" is a valid C type (x is a pointer to an array of
// length 20), so we need some way to embed numbers as part of symbols.
// This function parses it.
//
// <number> ::= [?] <non-negative integer>
//
// <non-negative integer> ::= <decimal digit> # when 1 <= Number <= 10
// ::= <hex digit>+ @ # when Numbrer == 0 or >= 10
//
// <hex-digit> ::= [A-P] # A = 0, B = 1, ...
std::pair<uint64_t, bool> Demangler::demangleNumber(StringView &MangledName) {
bool IsNegative = MangledName.consumeFront('?');
if (startsWithDigit(MangledName)) {
uint64_t Ret = MangledName[0] - '0' + 1;
MangledName = MangledName.dropFront(1);
return {Ret, IsNegative};
}
uint64_t Ret = 0;
for (size_t i = 0; i < MangledName.size(); ++i) {
char C = MangledName[i];
if (C == '@') {
MangledName = MangledName.dropFront(i + 1);
return {Ret, IsNegative};
}
if ('A' <= C && C <= 'P') {
Ret = (Ret << 4) + (C - 'A');
continue;
}
break;
}
Error = true;
return {0ULL, false};
}
uint64_t Demangler::demangleUnsigned(StringView &MangledName) {
bool IsNegative = false;
uint64_t Number = 0;
std::tie(Number, IsNegative) = demangleNumber(MangledName);
if (IsNegative)
Error = true;
return Number;
}
int64_t Demangler::demangleSigned(StringView &MangledName) {
bool IsNegative = false;
uint64_t Number = 0;
std::tie(Number, IsNegative) = demangleNumber(MangledName);
if (Number > INT64_MAX)
Error = true;
int64_t I = static_cast<int64_t>(Number);
return IsNegative ? -I : I;
}
// First 10 strings can be referenced by special BackReferences ?0, ?1, ..., ?9.
// Memorize it.
void Demangler::memorizeString(StringView S) {
if (Backrefs.NamesCount >= BackrefContext::Max)
return;
for (size_t i = 0; i < Backrefs.NamesCount; ++i)
if (S == Backrefs.Names[i]->Name)
return;
NamedIdentifierNode *N = Arena.alloc<NamedIdentifierNode>();
N->Name = S;
Backrefs.Names[Backrefs.NamesCount++] = N;
}
NamedIdentifierNode *Demangler::demangleBackRefName(StringView &MangledName) {
assert(startsWithDigit(MangledName));
size_t I = MangledName[0] - '0';
if (I >= Backrefs.NamesCount) {
Error = true;
return nullptr;
}
MangledName = MangledName.dropFront();
return Backrefs.Names[I];
}
void Demangler::memorizeIdentifier(IdentifierNode *Identifier) {
// Render this class template name into a string buffer so that we can
// memorize it for the purpose of back-referencing.
OutputStream OS;
if (!initializeOutputStream(nullptr, nullptr, OS, 1024))
// FIXME: Propagate out-of-memory as an error?
std::terminate();
Identifier->output(OS, OF_Default);
OS << '\0';
char *Name = OS.getBuffer();
StringView Owned = copyString(Name);
memorizeString(Owned);
std::free(Name);
}
IdentifierNode *
Demangler::demangleTemplateInstantiationName(StringView &MangledName,
NameBackrefBehavior NBB) {
assert(MangledName.startsWith("?$"));
MangledName.consumeFront("?$");
BackrefContext OuterContext;
std::swap(OuterContext, Backrefs);
IdentifierNode *Identifier =
demangleUnqualifiedSymbolName(MangledName, NBB_Simple);
if (!Error)
Identifier->TemplateParams = demangleTemplateParameterList(MangledName);
std::swap(OuterContext, Backrefs);
if (Error)
return nullptr;
if (NBB & NBB_Template)
memorizeIdentifier(Identifier);
return Identifier;
}
NamedIdentifierNode *Demangler::demangleSimpleName(StringView &MangledName,
bool Memorize) {
StringView S = demangleSimpleString(MangledName, Memorize);
if (Error)
return nullptr;
NamedIdentifierNode *Name = Arena.alloc<NamedIdentifierNode>();
Name->Name = S;
return Name;
}
static bool isRebasedHexDigit(char C) { return (C >= 'A' && C <= 'P'); }
static uint8_t rebasedHexDigitToNumber(char C) {
assert(isRebasedHexDigit(C));
return (C <= 'J') ? (C - 'A') : (10 + C - 'K');
}
uint8_t Demangler::demangleCharLiteral(StringView &MangledName) {
if (!MangledName.startsWith('?'))
return MangledName.popFront();
MangledName = MangledName.dropFront();
if (MangledName.empty())
goto CharLiteralError;
if (MangledName.consumeFront('$')) {
// Two hex digits
if (MangledName.size() < 2)
goto CharLiteralError;
StringView Nibbles = MangledName.substr(0, 2);
if (!isRebasedHexDigit(Nibbles[0]) || !isRebasedHexDigit(Nibbles[1]))
goto CharLiteralError;
// Don't append the null terminator.
uint8_t C1 = rebasedHexDigitToNumber(Nibbles[0]);
uint8_t C2 = rebasedHexDigitToNumber(Nibbles[1]);
MangledName = MangledName.dropFront(2);
return (C1 << 4) | C2;
}
if (startsWithDigit(MangledName)) {
const char *Lookup = ",/\\:. \n\t'-";
char C = Lookup[MangledName[0] - '0'];
MangledName = MangledName.dropFront();
return C;
}
if (MangledName[0] >= 'a' && MangledName[0] <= 'z') {
char Lookup[26] = {'\xE1', '\xE2', '\xE3', '\xE4', '\xE5', '\xE6', '\xE7',
'\xE8', '\xE9', '\xEA', '\xEB', '\xEC', '\xED', '\xEE',
'\xEF', '\xF0', '\xF1', '\xF2', '\xF3', '\xF4', '\xF5',
'\xF6', '\xF7', '\xF8', '\xF9', '\xFA'};
char C = Lookup[MangledName[0] - 'a'];
MangledName = MangledName.dropFront();
return C;
}
if (MangledName[0] >= 'A' && MangledName[0] <= 'Z') {