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Diffstat (limited to 'contrib/llvm/lib/Demangle/ItaniumDemangle.cpp')
| -rw-r--r-- | contrib/llvm/lib/Demangle/ItaniumDemangle.cpp | 5208 |
1 files changed, 5208 insertions, 0 deletions
diff --git a/contrib/llvm/lib/Demangle/ItaniumDemangle.cpp b/contrib/llvm/lib/Demangle/ItaniumDemangle.cpp new file mode 100644 index 000000000000..72e4b56c05e3 --- /dev/null +++ b/contrib/llvm/lib/Demangle/ItaniumDemangle.cpp @@ -0,0 +1,5208 @@ +//===------------------------- ItaniumDemangle.cpp ------------------------===// +// +// The LLVM Compiler Infrastructure +// +// This file is dual licensed under the MIT and the University of Illinois Open +// Source Licenses. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// + +// FIXME: (possibly) incomplete list of features that clang mangles that this +// file does not yet support: +// - C++ modules TS + +#include "Compiler.h" +#include "StringView.h" +#include "Utility.h" +#include "llvm/Demangle/Demangle.h" + +#include <cassert> +#include <cctype> +#include <cstdio> +#include <cstdlib> +#include <cstring> +#include <numeric> +#include <utility> +#include <vector> + +namespace { +// Base class of all AST nodes. The AST is built by the parser, then is +// traversed by the printLeft/Right functions to produce a demangled string. +class Node { +public: + enum Kind : unsigned char { + KNodeArrayNode, + KDotSuffix, + KVendorExtQualType, + KQualType, + KConversionOperatorType, + KPostfixQualifiedType, + KElaboratedTypeSpefType, + KNameType, + KAbiTagAttr, + KEnableIfAttr, + KObjCProtoName, + KPointerType, + KReferenceType, + KPointerToMemberType, + KArrayType, + KFunctionType, + KNoexceptSpec, + KDynamicExceptionSpec, + KFunctionEncoding, + KLiteralOperator, + KSpecialName, + KCtorVtableSpecialName, + KQualifiedName, + KNestedName, + KLocalName, + KVectorType, + KParameterPack, + KTemplateArgumentPack, + KParameterPackExpansion, + KTemplateArgs, + KForwardTemplateReference, + KNameWithTemplateArgs, + KGlobalQualifiedName, + KStdQualifiedName, + KExpandedSpecialSubstitution, + KSpecialSubstitution, + KCtorDtorName, + KDtorName, + KUnnamedTypeName, + KClosureTypeName, + KStructuredBindingName, + KExpr, + KBracedExpr, + KBracedRangeExpr, + }; + + Kind K; + + /// Three-way bool to track a cached value. Unknown is possible if this node + /// has an unexpanded parameter pack below it that may affect this cache. + enum class Cache : unsigned char { Yes, No, Unknown, }; + + /// Tracks if this node has a component on its right side, in which case we + /// need to call printRight. + Cache RHSComponentCache; + + /// Track if this node is a (possibly qualified) array type. This can affect + /// how we format the output string. + Cache ArrayCache; + + /// Track if this node is a (possibly qualified) function type. This can + /// affect how we format the output string. + Cache FunctionCache; + + Node(Kind K_, Cache RHSComponentCache_ = Cache::No, + Cache ArrayCache_ = Cache::No, Cache FunctionCache_ = Cache::No) + : K(K_), RHSComponentCache(RHSComponentCache_), ArrayCache(ArrayCache_), + FunctionCache(FunctionCache_) {} + + bool hasRHSComponent(OutputStream &S) const { + if (RHSComponentCache != Cache::Unknown) + return RHSComponentCache == Cache::Yes; + return hasRHSComponentSlow(S); + } + + bool hasArray(OutputStream &S) const { + if (ArrayCache != Cache::Unknown) + return ArrayCache == Cache::Yes; + return hasArraySlow(S); + } + + bool hasFunction(OutputStream &S) const { + if (FunctionCache != Cache::Unknown) + return FunctionCache == Cache::Yes; + return hasFunctionSlow(S); + } + + Kind getKind() const { return K; } + + virtual bool hasRHSComponentSlow(OutputStream &) const { return false; } + virtual bool hasArraySlow(OutputStream &) const { return false; } + virtual bool hasFunctionSlow(OutputStream &) const { return false; } + + // Dig through "glue" nodes like ParameterPack and ForwardTemplateReference to + // get at a node that actually represents some concrete syntax. + virtual const Node *getSyntaxNode(OutputStream &) const { + return this; + } + + void print(OutputStream &S) const { + printLeft(S); + if (RHSComponentCache != Cache::No) + printRight(S); + } + + // Print the "left" side of this Node into OutputStream. + virtual void printLeft(OutputStream &) const = 0; + + // Print the "right". This distinction is necessary to represent C++ types + // that appear on the RHS of their subtype, such as arrays or functions. + // Since most types don't have such a component, provide a default + // implementation. + virtual void printRight(OutputStream &) const {} + + virtual StringView getBaseName() const { return StringView(); } + + // Silence compiler warnings, this dtor will never be called. + virtual ~Node() = default; + +#ifndef NDEBUG + LLVM_DUMP_METHOD void dump() const { + char *Buffer = static_cast<char*>(std::malloc(1024)); + OutputStream S(Buffer, 1024); + print(S); + S += '\0'; + printf("Symbol dump for %p: %s\n", (const void*)this, S.getBuffer()); + std::free(S.getBuffer()); + } +#endif +}; + +class NodeArray { + Node **Elements; + size_t NumElements; + +public: + NodeArray() : Elements(nullptr), NumElements(0) {} + NodeArray(Node **Elements_, size_t NumElements_) + : Elements(Elements_), NumElements(NumElements_) {} + + bool empty() const { return NumElements == 0; } + size_t size() const { return NumElements; } + + Node **begin() const { return Elements; } + Node **end() const { return Elements + NumElements; } + + Node *operator[](size_t Idx) const { return Elements[Idx]; } + + void printWithComma(OutputStream &S) const { + bool FirstElement = true; + for (size_t Idx = 0; Idx != NumElements; ++Idx) { + size_t BeforeComma = S.getCurrentPosition(); + if (!FirstElement) + S += ", "; + size_t AfterComma = S.getCurrentPosition(); + Elements[Idx]->print(S); + + // Elements[Idx] is an empty parameter pack expansion, we should erase the + // comma we just printed. + if (AfterComma == S.getCurrentPosition()) { + S.setCurrentPosition(BeforeComma); + continue; + } + + FirstElement = false; + } + } +}; + +struct NodeArrayNode : Node { + NodeArray Array; + NodeArrayNode(NodeArray Array_) : Node(KNodeArrayNode), Array(Array_) {} + void printLeft(OutputStream &S) const override { + Array.printWithComma(S); + } +}; + +class DotSuffix final : public Node { + const Node *Prefix; + const StringView Suffix; + +public: + DotSuffix(Node *Prefix_, StringView Suffix_) + : Node(KDotSuffix), Prefix(Prefix_), Suffix(Suffix_) {} + + void printLeft(OutputStream &s) const override { + Prefix->print(s); + s += " ("; + s += Suffix; + s += ")"; + } +}; + +class VendorExtQualType final : public Node { + const Node *Ty; + StringView Ext; + +public: + VendorExtQualType(Node *Ty_, StringView Ext_) + : Node(KVendorExtQualType), Ty(Ty_), Ext(Ext_) {} + + void printLeft(OutputStream &S) const override { + Ty->print(S); + S += " "; + S += Ext; + } +}; + +enum FunctionRefQual : unsigned char { + FrefQualNone, + FrefQualLValue, + FrefQualRValue, +}; + +enum Qualifiers { + QualNone = 0, + QualConst = 0x1, + QualVolatile = 0x2, + QualRestrict = 0x4, +}; + +void addQualifiers(Qualifiers &Q1, Qualifiers Q2) { + Q1 = static_cast<Qualifiers>(Q1 | Q2); +} + +class QualType : public Node { +protected: + const Qualifiers Quals; + const Node *Child; + + void printQuals(OutputStream &S) const { + if (Quals & QualConst) + S += " const"; + if (Quals & QualVolatile) + S += " volatile"; + if (Quals & QualRestrict) + S += " restrict"; + } + +public: + QualType(Node *Child_, Qualifiers Quals_) + : Node(KQualType, Child_->RHSComponentCache, + Child_->ArrayCache, Child_->FunctionCache), + Quals(Quals_), Child(Child_) {} + + bool hasRHSComponentSlow(OutputStream &S) const override { + return Child->hasRHSComponent(S); + } + bool hasArraySlow(OutputStream &S) const override { + return Child->hasArray(S); + } + bool hasFunctionSlow(OutputStream &S) const override { + return Child->hasFunction(S); + } + + void printLeft(OutputStream &S) const override { + Child->printLeft(S); + printQuals(S); + } + + void printRight(OutputStream &S) const override { Child->printRight(S); } +}; + +class ConversionOperatorType final : public Node { + const Node *Ty; + +public: + ConversionOperatorType(Node *Ty_) + : Node(KConversionOperatorType), Ty(Ty_) {} + + void printLeft(OutputStream &S) const override { + S += "operator "; + Ty->print(S); + } +}; + +class PostfixQualifiedType final : public Node { + const Node *Ty; + const StringView Postfix; + +public: + PostfixQualifiedType(Node *Ty_, StringView Postfix_) + : Node(KPostfixQualifiedType), Ty(Ty_), Postfix(Postfix_) {} + + void printLeft(OutputStream &s) const override { + Ty->printLeft(s); + s += Postfix; + } +}; + +class NameType final : public Node { + const StringView Name; + +public: + NameType(StringView Name_) : Node(KNameType), Name(Name_) {} + + StringView getName() const { return Name; } + StringView getBaseName() const override { return Name; } + + void printLeft(OutputStream &s) const override { s += Name; } +}; + +class ElaboratedTypeSpefType : public Node { + StringView Kind; + Node *Child; +public: + ElaboratedTypeSpefType(StringView Kind_, Node *Child_) + : Node(KElaboratedTypeSpefType), Kind(Kind_), Child(Child_) {} + + void printLeft(OutputStream &S) const override { + S += Kind; + S += ' '; + Child->print(S); + } +}; + +struct AbiTagAttr : Node { + Node *Base; + StringView Tag; + + AbiTagAttr(Node* Base_, StringView Tag_) + : Node(KAbiTagAttr, Base_->RHSComponentCache, + Base_->ArrayCache, Base_->FunctionCache), + Base(Base_), Tag(Tag_) {} + + void printLeft(OutputStream &S) const override { + Base->printLeft(S); + S += "[abi:"; + S += Tag; + S += "]"; + } +}; + +class EnableIfAttr : public Node { + NodeArray Conditions; +public: + EnableIfAttr(NodeArray Conditions_) + : Node(KEnableIfAttr), Conditions(Conditions_) {} + + void printLeft(OutputStream &S) const override { + S += " [enable_if:"; + Conditions.printWithComma(S); + S += ']'; + } +}; + +class ObjCProtoName : public Node { + Node *Ty; + StringView Protocol; + + friend class PointerType; + +public: + ObjCProtoName(Node *Ty_, StringView Protocol_) + : Node(KObjCProtoName), Ty(Ty_), Protocol(Protocol_) {} + + bool isObjCObject() const { + return Ty->getKind() == KNameType && + static_cast<NameType *>(Ty)->getName() == "objc_object"; + } + + void printLeft(OutputStream &S) const override { + Ty->print(S); + S += "<"; + S += Protocol; + S += ">"; + } +}; + +class PointerType final : public Node { + const Node *Pointee; + +public: + PointerType(Node *Pointee_) + : Node(KPointerType, Pointee_->RHSComponentCache), + Pointee(Pointee_) {} + + bool hasRHSComponentSlow(OutputStream &S) const override { + return Pointee->hasRHSComponent(S); + } + + void printLeft(OutputStream &s) const override { + // We rewrite objc_object<SomeProtocol>* into id<SomeProtocol>. + if (Pointee->getKind() != KObjCProtoName || + !static_cast<const ObjCProtoName *>(Pointee)->isObjCObject()) { + Pointee->printLeft(s); + if (Pointee->hasArray(s)) + s += " "; + if (Pointee->hasArray(s) || Pointee->hasFunction(s)) + s += "("; + s += "*"; + } else { + const auto *objcProto = static_cast<const ObjCProtoName *>(Pointee); + s += "id<"; + s += objcProto->Protocol; + s += ">"; + } + } + + void printRight(OutputStream &s) const override { + if (Pointee->getKind() != KObjCProtoName || + !static_cast<const ObjCProtoName *>(Pointee)->isObjCObject()) { + if (Pointee->hasArray(s) || Pointee->hasFunction(s)) + s += ")"; + Pointee->printRight(s); + } + } +}; + +enum class ReferenceKind { + LValue, + RValue, +}; + +// Represents either a LValue or an RValue reference type. +class ReferenceType : public Node { + const Node *Pointee; + ReferenceKind RK; + + mutable bool Printing = false; + + // Dig through any refs to refs, collapsing the ReferenceTypes as we go. The + // rule here is rvalue ref to rvalue ref collapses to a rvalue ref, and any + // other combination collapses to a lvalue ref. + std::pair<ReferenceKind, const Node *> collapse(OutputStream &S) const { + auto SoFar = std::make_pair(RK, Pointee); + for (;;) { + const Node *SN = SoFar.second->getSyntaxNode(S); + if (SN->getKind() != KReferenceType) + break; + auto *RT = static_cast<const ReferenceType *>(SN); + SoFar.second = RT->Pointee; + SoFar.first = std::min(SoFar.first, RT->RK); + } + return SoFar; + } + +public: + ReferenceType(Node *Pointee_, ReferenceKind RK_) + : Node(KReferenceType, Pointee_->RHSComponentCache), + Pointee(Pointee_), RK(RK_) {} + + bool hasRHSComponentSlow(OutputStream &S) const override { + return Pointee->hasRHSComponent(S); + } + + void printLeft(OutputStream &s) const override { + if (Printing) + return; + SwapAndRestore<bool> SavePrinting(Printing, true); + std::pair<ReferenceKind, const Node *> Collapsed = collapse(s); + Collapsed.second->printLeft(s); + if (Collapsed.second->hasArray(s)) + s += " "; + if (Collapsed.second->hasArray(s) || Collapsed.second->hasFunction(s)) + s += "("; + + s += (Collapsed.first == ReferenceKind::LValue ? "&" : "&&"); + } + void printRight(OutputStream &s) const override { + if (Printing) + return; + SwapAndRestore<bool> SavePrinting(Printing, true); + std::pair<ReferenceKind, const Node *> Collapsed = collapse(s); + if (Collapsed.second->hasArray(s) || Collapsed.second->hasFunction(s)) + s += ")"; + Collapsed.second->printRight(s); + } +}; + +class PointerToMemberType final : public Node { + const Node *ClassType; + const Node *MemberType; + +public: + PointerToMemberType(Node *ClassType_, Node *MemberType_) + : Node(KPointerToMemberType, MemberType_->RHSComponentCache), + ClassType(ClassType_), MemberType(MemberType_) {} + + bool hasRHSComponentSlow(OutputStream &S) const override { + return MemberType->hasRHSComponent(S); + } + + void printLeft(OutputStream &s) const override { + MemberType->printLeft(s); + if (MemberType->hasArray(s) || MemberType->hasFunction(s)) + s += "("; + else + s += " "; + ClassType->print(s); + s += "::*"; + } + + void printRight(OutputStream &s) const override { + if (MemberType->hasArray(s) || MemberType->hasFunction(s)) + s += ")"; + MemberType->printRight(s); + } +}; + +class NodeOrString { + const void *First; + const void *Second; + +public: + /* implicit */ NodeOrString(StringView Str) { + const char *FirstChar = Str.begin(); + const char *SecondChar = Str.end(); + if (SecondChar == nullptr) { + assert(FirstChar == SecondChar); + ++FirstChar, ++SecondChar; + } + First = static_cast<const void *>(FirstChar); + Second = static_cast<const void *>(SecondChar); + } + + /* implicit */ NodeOrString(Node *N) + : First(static_cast<const void *>(N)), Second(nullptr) {} + NodeOrString() : First(nullptr), Second(nullptr) {} + + bool isString() const { return Second && First; } + bool isNode() const { return First && !Second; } + bool isEmpty() const { return !First && !Second; } + + StringView asString() const { + assert(isString()); + return StringView(static_cast<const char *>(First), + static_cast<const char *>(Second)); + } + + const Node *asNode() const { + assert(isNode()); + return static_cast<const Node *>(First); + } +}; + +class ArrayType final : public Node { + Node *Base; + NodeOrString Dimension; + +public: + ArrayType(Node *Base_, NodeOrString Dimension_) + : Node(KArrayType, + /*RHSComponentCache=*/Cache::Yes, + /*ArrayCache=*/Cache::Yes), + Base(Base_), Dimension(Dimension_) {} + + // Incomplete array type. + ArrayType(Node *Base_) + : Node(KArrayType, + /*RHSComponentCache=*/Cache::Yes, + /*ArrayCache=*/Cache::Yes), + Base(Base_) {} + + bool hasRHSComponentSlow(OutputStream &) const override { return true; } + bool hasArraySlow(OutputStream &) const override { return true; } + + void printLeft(OutputStream &S) const override { Base->printLeft(S); } + + void printRight(OutputStream &S) const override { + if (S.back() != ']') + S += " "; + S += "["; + if (Dimension.isString()) + S += Dimension.asString(); + else if (Dimension.isNode()) + Dimension.asNode()->print(S); + S += "]"; + Base->printRight(S); + } +}; + +class FunctionType final : public Node { + Node *Ret; + NodeArray Params; + Qualifiers CVQuals; + FunctionRefQual RefQual; + Node *ExceptionSpec; + +public: + FunctionType(Node *Ret_, NodeArray Params_, Qualifiers CVQuals_, + FunctionRefQual RefQual_, Node *ExceptionSpec_) + : Node(KFunctionType, + /*RHSComponentCache=*/Cache::Yes, /*ArrayCache=*/Cache::No, + /*FunctionCache=*/Cache::Yes), + Ret(Ret_), Params(Params_), CVQuals(CVQuals_), RefQual(RefQual_), + ExceptionSpec(ExceptionSpec_) {} + + bool hasRHSComponentSlow(OutputStream &) const override { return true; } + bool hasFunctionSlow(OutputStream &) const override { return true; } + + // Handle C++'s ... quirky decl grammar by using the left & right + // distinction. Consider: + // int (*f(float))(char) {} + // f is a function that takes a float and returns a pointer to a function + // that takes a char and returns an int. If we're trying to print f, start + // by printing out the return types's left, then print our parameters, then + // finally print right of the return type. + void printLeft(OutputStream &S) const override { + Ret->printLeft(S); + S += " "; + } + + void printRight(OutputStream &S) const override { + S += "("; + Params.printWithComma(S); + S += ")"; + Ret->printRight(S); + + if (CVQuals & QualConst) + S += " const"; + if (CVQuals & QualVolatile) + S += " volatile"; + if (CVQuals & QualRestrict) + S += " restrict"; + + if (RefQual == FrefQualLValue) + S += " &"; + else if (RefQual == FrefQualRValue) + S += " &&"; + + if (ExceptionSpec != nullptr) { + S += ' '; + ExceptionSpec->print(S); + } + } +}; + +class NoexceptSpec : public Node { + Node *E; +public: + NoexceptSpec(Node *E_) : Node(KNoexceptSpec), E(E_) {} + + void printLeft(OutputStream &S) const override { + S += "noexcept("; + E->print(S); + S += ")"; + } +}; + +class DynamicExceptionSpec : public Node { + NodeArray Types; +public: + DynamicExceptionSpec(NodeArray Types_) + : Node(KDynamicExceptionSpec), Types(Types_) {} + + void printLeft(OutputStream &S) const override { + S += "throw("; + Types.printWithComma(S); + S += ')'; + } +}; + +class FunctionEncoding final : public Node { + Node *Ret; + Node *Name; + NodeArray Params; + Node *Attrs; + Qualifiers CVQuals; + FunctionRefQual RefQual; + +public: + FunctionEncoding(Node *Ret_, Node *Name_, NodeArray Params_, + Node *Attrs_, Qualifiers CVQuals_, FunctionRefQual RefQual_) + : Node(KFunctionEncoding, + /*RHSComponentCache=*/Cache::Yes, /*ArrayCache=*/Cache::No, + /*FunctionCache=*/Cache::Yes), + Ret(Ret_), Name(Name_), Params(Params_), Attrs(Attrs_), + CVQuals(CVQuals_), RefQual(RefQual_) {} + + Qualifiers getCVQuals() const { return CVQuals; } + FunctionRefQual getRefQual() const { return RefQual; } + NodeArray getParams() const { return Params; } + Node *getReturnType() const { return Ret; } + + bool hasRHSComponentSlow(OutputStream &) const override { return true; } + bool hasFunctionSlow(OutputStream &) const override { return true; } + + Node *getName() { return const_cast<Node *>(Name); } + + void printLeft(OutputStream &S) const override { + if (Ret) { + Ret->printLeft(S); + if (!Ret->hasRHSComponent(S)) + S += " "; + } + Name->print(S); + } + + void printRight(OutputStream &S) const override { + S += "("; + Params.printWithComma(S); + S += ")"; + if (Ret) + Ret->printRight(S); + + if (CVQuals & QualConst) + S += " const"; + if (CVQuals & QualVolatile) + S += " volatile"; + if (CVQuals & QualRestrict) + S += " restrict"; + + if (RefQual == FrefQualLValue) + S += " &"; + else if (RefQual == FrefQualRValue) + S += " &&"; + + if (Attrs != nullptr) + Attrs->print(S); + } +}; + +class LiteralOperator : public Node { + const Node *OpName; + +public: + LiteralOperator(Node *OpName_) : Node(KLiteralOperator), OpName(OpName_) {} + + void printLeft(OutputStream &S) const override { + S += "operator\"\" "; + OpName->print(S); + } +}; + +class SpecialName final : public Node { + const StringView Special; + const Node *Child; + +public: + SpecialName(StringView Special_, Node* Child_) + : Node(KSpecialName), Special(Special_), Child(Child_) {} + + void printLeft(OutputStream &S) const override { + S += Special; + Child->print(S); + } +}; + +class CtorVtableSpecialName final : public Node { + const Node *FirstType; + const Node *SecondType; + +public: + CtorVtableSpecialName(Node *FirstType_, Node *SecondType_) + : Node(KCtorVtableSpecialName), + FirstType(FirstType_), SecondType(SecondType_) {} + + void printLeft(OutputStream &S) const override { + S += "construction vtable for "; + FirstType->print(S); + S += "-in-"; + SecondType->print(S); + } +}; + +struct NestedName : Node { + Node *Qual; + Node *Name; + + NestedName(Node *Qual_, Node *Name_) + : Node(KNestedName), Qual(Qual_), Name(Name_) {} + + StringView getBaseName() const override { return Name->getBaseName(); } + + void printLeft(OutputStream &S) const override { + Qual->print(S); + S += "::"; + Name->print(S); + } +}; + +struct LocalName : Node { + Node *Encoding; + Node *Entity; + + LocalName(Node *Encoding_, Node *Entity_) + : Node(KLocalName), Encoding(Encoding_), Entity(Entity_) {} + + void printLeft(OutputStream &S) const override { + Encoding->print(S); + S += "::"; + Entity->print(S); + } +}; + +class QualifiedName final : public Node { + // qualifier::name + const Node *Qualifier; + const Node *Name; + +public: + QualifiedName(Node* Qualifier_, Node* Name_) + : Node(KQualifiedName), Qualifier(Qualifier_), Name(Name_) {} + + StringView getBaseName() const override { return Name->getBaseName(); } + + void printLeft(OutputStream &S) const override { + Qualifier->print(S); + S += "::"; + Name->print(S); + } +}; + +class VectorType final : public Node { + const Node *BaseType; + const NodeOrString Dimension; + const bool IsPixel; + +public: + VectorType(NodeOrString Dimension_) + : Node(KVectorType), BaseType(nullptr), Dimension(Dimension_), + IsPixel(true) {} + VectorType(Node *BaseType_, NodeOrString Dimension_) + : Node(KVectorType), BaseType(BaseType_), + Dimension(Dimension_), IsPixel(false) {} + + void printLeft(OutputStream &S) const override { + if (IsPixel) { + S += "pixel vector["; + S += Dimension.asString(); + S += "]"; + } else { + BaseType->print(S); + S += " vector["; + if (Dimension.isNode()) + Dimension.asNode()->print(S); + else if (Dimension.isString()) + S += Dimension.asString(); + S += "]"; + } + } +}; + +/// An unexpanded parameter pack (either in the expression or type context). If +/// this AST is correct, this node will have a ParameterPackExpansion node above +/// it. +/// +/// This node is created when some <template-args> are found that apply to an +/// <encoding>, and is stored in the TemplateParams table. In order for this to +/// appear in the final AST, it has to referenced via a <template-param> (ie, +/// T_). +class ParameterPack final : public Node { + NodeArray Data; + + // Setup OutputStream for a pack expansion unless we're already expanding one. + void initializePackExpansion(OutputStream &S) const { + if (S.CurrentPackMax == std::numeric_limits<unsigned>::max()) { + S.CurrentPackMax = static_cast<unsigned>(Data.size()); + S.CurrentPackIndex = 0; + } + } + +public: + ParameterPack(NodeArray Data_) : Node(KParameterPack), Data(Data_) { + ArrayCache = FunctionCache = RHSComponentCache = Cache::Unknown; + if (std::all_of(Data.begin(), Data.end(), [](Node* P) { + return P->ArrayCache == Cache::No; + })) + ArrayCache = Cache::No; + if (std::all_of(Data.begin(), Data.end(), [](Node* P) { + return P->FunctionCache == Cache::No; + })) + FunctionCache = Cache::No; + if (std::all_of(Data.begin(), Data.end(), [](Node* P) { + return P->RHSComponentCache == Cache::No; + })) + RHSComponentCache = Cache::No; + } + + bool hasRHSComponentSlow(OutputStream &S) const override { + initializePackExpansion(S); + size_t Idx = S.CurrentPackIndex; + return Idx < Data.size() && Data[Idx]->hasRHSComponent(S); + } + bool hasArraySlow(OutputStream &S) const override { + initializePackExpansion(S); + size_t Idx = S.CurrentPackIndex; + return Idx < Data.size() && Data[Idx]->hasArray(S); + } + bool hasFunctionSlow(OutputStream &S) const override { + initializePackExpansion(S); + size_t Idx = S.CurrentPackIndex; + return Idx < Data.size() && Data[Idx]->hasFunction(S); + } + const Node *getSyntaxNode(OutputStream &S) const override { + initializePackExpansion(S); + size_t Idx = S.CurrentPackIndex; + return Idx < Data.size() ? Data[Idx]->getSyntaxNode(S) : this; + } + + void printLeft(OutputStream &S) const override { + initializePackExpansion(S); + size_t Idx = S.CurrentPackIndex; + if (Idx < Data.size()) + Data[Idx]->printLeft(S); + } + void printRight(OutputStream &S) const override { + initializePackExpansion(S); + size_t Idx = S.CurrentPackIndex; + if (Idx < Data.size()) + Data[Idx]->printRight(S); + } +}; + +/// A variadic template argument. This node represents an occurrence of +/// J<something>E in some <template-args>. It isn't itself unexpanded, unless +/// one of it's Elements is. The parser inserts a ParameterPack into the +/// TemplateParams table if the <template-args> this pack belongs to apply to an +/// <encoding>. +class TemplateArgumentPack final : public Node { + NodeArray Elements; +public: + TemplateArgumentPack(NodeArray Elements_) + : Node(KTemplateArgumentPack), Elements(Elements_) {} + + NodeArray getElements() const { return Elements; } + + void printLeft(OutputStream &S) const override { + Elements.printWithComma(S); + } +}; + +/// A pack expansion. Below this node, there are some unexpanded ParameterPacks +/// which each have Child->ParameterPackSize elements. +class ParameterPackExpansion final : public Node { + const Node *Child; + +public: + ParameterPackExpansion(Node* Child_) + : Node(KParameterPackExpansion), Child(Child_) {} + + const Node *getChild() const { return Child; } + + void printLeft(OutputStream &S) const override { + constexpr unsigned Max = std::numeric_limits<unsigned>::max(); + SwapAndRestore<unsigned> SavePackIdx(S.CurrentPackIndex, Max); + SwapAndRestore<unsigned> SavePackMax(S.CurrentPackMax, Max); + size_t StreamPos = S.getCurrentPosition(); + + // Print the first element in the pack. If Child contains a ParameterPack, + // it will set up S.CurrentPackMax and print the first element. + Child->print(S); + + // No ParameterPack was found in Child. This can occur if we've found a pack + // expansion on a <function-param>. + if (S.CurrentPackMax == Max) { + S += "..."; + return; + } + + // We found a ParameterPack, but it has no elements. Erase whatever we may + // of printed. + if (S.CurrentPackMax == 0) { + S.setCurrentPosition(StreamPos); + return; + } + + // Else, iterate through the rest of the elements in the pack. + for (unsigned I = 1, E = S.CurrentPackMax; I < E; ++I) { + S += ", "; + S.CurrentPackIndex = I; + Child->print(S); + } + } +}; + +class TemplateArgs final : public Node { + NodeArray Params; + +public: + TemplateArgs(NodeArray Params_) : Node(KTemplateArgs), Params(Params_) {} + + NodeArray getParams() { return Params; } + + void printLeft(OutputStream &S) const override { + S += "<"; + Params.printWithComma(S); + if (S.back() == '>') + S += " "; + S += ">"; + } +}; + +struct ForwardTemplateReference : Node { + size_t Index; + Node *Ref = nullptr; + + // If we're currently printing this node. It is possible (though invalid) for + // a forward template reference to refer to itself via a substitution. This + // creates a cyclic AST, which will stack overflow printing. To fix this, bail + // out if more than one print* function is active. + mutable bool Printing = false; + + ForwardTemplateReference(size_t Index_) + : Node(KForwardTemplateReference, Cache::Unknown, Cache::Unknown, + Cache::Unknown), + Index(Index_) {} + + bool hasRHSComponentSlow(OutputStream &S) const override { + if (Printing) + return false; + SwapAndRestore<bool> SavePrinting(Printing, true); + return Ref->hasRHSComponent(S); + } + bool hasArraySlow(OutputStream &S) const override { + if (Printing) + return false; + SwapAndRestore<bool> SavePrinting(Printing, true); + return Ref->hasArray(S); + } + bool hasFunctionSlow(OutputStream &S) const override { + if (Printing) + return false; + SwapAndRestore<bool> SavePrinting(Printing, true); + return Ref->hasFunction(S); + } + const Node *getSyntaxNode(OutputStream &S) const override { + if (Printing) + return this; + SwapAndRestore<bool> SavePrinting(Printing, true); + return Ref->getSyntaxNode(S); + } + + void printLeft(OutputStream &S) const override { + if (Printing) + return; + SwapAndRestore<bool> SavePrinting(Printing, true); + Ref->printLeft(S); + } + void printRight(OutputStream &S) const override { + if (Printing) + return; + SwapAndRestore<bool> SavePrinting(Printing, true); + Ref->printRight(S); + } +}; + +struct NameWithTemplateArgs : Node { + // name<template_args> + Node *Name; + Node *TemplateArgs; + + NameWithTemplateArgs(Node *Name_, Node *TemplateArgs_) + : Node(KNameWithTemplateArgs), Name(Name_), TemplateArgs(TemplateArgs_) {} + + StringView getBaseName() const override { return Name->getBaseName(); } + + void printLeft(OutputStream &S) const override { + Name->print(S); + TemplateArgs->print(S); + } +}; + +class GlobalQualifiedName final : public Node { + Node *Child; + +public: + GlobalQualifiedName(Node* Child_) + : Node(KGlobalQualifiedName), Child(Child_) {} + + StringView getBaseName() const override { return Child->getBaseName(); } + + void printLeft(OutputStream &S) const override { + S += "::"; + Child->print(S); + } +}; + +struct StdQualifiedName : Node { + Node *Child; + + StdQualifiedName(Node *Child_) : Node(KStdQualifiedName), Child(Child_) {} + + StringView getBaseName() const override { return Child->getBaseName(); } + + void printLeft(OutputStream &S) const override { + S += "std::"; + Child->print(S); + } +}; + +enum class SpecialSubKind { + allocator, + basic_string, + string, + istream, + ostream, + iostream, +}; + +class ExpandedSpecialSubstitution final : public Node { + SpecialSubKind SSK; + +public: + ExpandedSpecialSubstitution(SpecialSubKind SSK_) + : Node(KExpandedSpecialSubstitution), SSK(SSK_) {} + + StringView getBaseName() const override { + switch (SSK) { + case SpecialSubKind::allocator: + return StringView("allocator"); + case SpecialSubKind::basic_string: + return StringView("basic_string"); + case SpecialSubKind::string: + return StringView("basic_string"); + case SpecialSubKind::istream: + return StringView("basic_istream"); + case SpecialSubKind::ostream: + return StringView("basic_ostream"); + case SpecialSubKind::iostream: + return StringView("basic_iostream"); + } + LLVM_BUILTIN_UNREACHABLE; + } + + void printLeft(OutputStream &S) const override { + switch (SSK) { + case SpecialSubKind::allocator: + S += "std::basic_string<char, std::char_traits<char>, " + "std::allocator<char> >"; + break; + case SpecialSubKind::basic_string: + case SpecialSubKind::string: + S += "std::basic_string<char, std::char_traits<char>, " + "std::allocator<char> >"; + break; + case SpecialSubKind::istream: + S += "std::basic_istream<char, std::char_traits<char> >"; + break; + case SpecialSubKind::ostream: + S += "std::basic_ostream<char, std::char_traits<char> >"; + break; + case SpecialSubKind::iostream: + S += "std::basic_iostream<char, std::char_traits<char> >"; + break; + } + } +}; + +class SpecialSubstitution final : public Node { +public: + SpecialSubKind SSK; + + SpecialSubstitution(SpecialSubKind SSK_) + : Node(KSpecialSubstitution), SSK(SSK_) {} + + StringView getBaseName() const override { + switch (SSK) { + case SpecialSubKind::allocator: + return StringView("allocator"); + case SpecialSubKind::basic_string: + return StringView("basic_string"); + case SpecialSubKind::string: + return StringView("string"); + case SpecialSubKind::istream: + return StringView("istream"); + case SpecialSubKind::ostream: + return StringView("ostream"); + case SpecialSubKind::iostream: + return StringView("iostream"); + } + LLVM_BUILTIN_UNREACHABLE; + } + + void printLeft(OutputStream &S) const override { + switch (SSK) { + case SpecialSubKind::allocator: + S += "std::allocator"; + break; + case SpecialSubKind::basic_string: + S += "std::basic_string"; + break; + case SpecialSubKind::string: + S += "std::string"; + break; + case SpecialSubKind::istream: + S += "std::istream"; + break; + case SpecialSubKind::ostream: + S += "std::ostream"; + break; + case SpecialSubKind::iostream: + S += "std::iostream"; + break; + } + } +}; + +class CtorDtorName final : public Node { + const Node *Basename; + const bool IsDtor; + +public: + CtorDtorName(Node *Basename_, bool IsDtor_) + : Node(KCtorDtorName), Basename(Basename_), IsDtor(IsDtor_) {} + + void printLeft(OutputStream &S) const override { + if (IsDtor) + S += "~"; + S += Basename->getBaseName(); + } +}; + +class DtorName : public Node { + const Node *Base; + +public: + DtorName(Node *Base_) : Node(KDtorName), Base(Base_) {} + + void printLeft(OutputStream &S) const override { + S += "~"; + Base->printLeft(S); + } +}; + +class UnnamedTypeName : public Node { + const StringView Count; + +public: + UnnamedTypeName(StringView Count_) : Node(KUnnamedTypeName), Count(Count_) {} + + void printLeft(OutputStream &S) const override { + S += "'unnamed"; + S += Count; + S += "\'"; + } +}; + +class ClosureTypeName : public Node { + NodeArray Params; + StringView Count; + +public: + ClosureTypeName(NodeArray Params_, StringView Count_) + : Node(KClosureTypeName), Params(Params_), Count(Count_) {} + + void printLeft(OutputStream &S) const override { + S += "\'lambda"; + S += Count; + S += "\'("; + Params.printWithComma(S); + S += ")"; + } +}; + +class StructuredBindingName : public Node { + NodeArray Bindings; +public: + StructuredBindingName(NodeArray Bindings_) + : Node(KStructuredBindingName), Bindings(Bindings_) {} + + void printLeft(OutputStream &S) const override { + S += '['; + Bindings.printWithComma(S); + S += ']'; + } +}; + +// -- Expression Nodes -- + +struct Expr : public Node { + Expr(Kind K = KExpr) : Node(K) {} +}; + +class BinaryExpr : public Expr { + const Node *LHS; + const StringView InfixOperator; + const Node *RHS; + +public: + BinaryExpr(Node *LHS_, StringView InfixOperator_, Node *RHS_) + : LHS(LHS_), InfixOperator(InfixOperator_), RHS(RHS_) {} + + void printLeft(OutputStream &S) const override { + // might be a template argument expression, then we need to disambiguate + // with parens. + if (InfixOperator == ">") + S += "("; + + S += "("; + LHS->print(S); + S += ") "; + S += InfixOperator; + S += " ("; + RHS->print(S); + S += ")"; + + if (InfixOperator == ">") + S += ")"; + } +}; + +class ArraySubscriptExpr : public Expr { + const Node *Op1; + const Node *Op2; + +public: + ArraySubscriptExpr(Node *Op1_, Node *Op2_) : Op1(Op1_), Op2(Op2_) {} + + void printLeft(OutputStream &S) const override { + S += "("; + Op1->print(S); + S += ")["; + Op2->print(S); + S += "]"; + } +}; + +class PostfixExpr : public Expr { + const Node *Child; + const StringView Operand; + +public: + PostfixExpr(Node *Child_, StringView Operand_) + : Child(Child_), Operand(Operand_) {} + + void printLeft(OutputStream &S) const override { + S += "("; + Child->print(S); + S += ")"; + S += Operand; + } +}; + +class ConditionalExpr : public Expr { + const Node *Cond; + const Node *Then; + const Node *Else; + +public: + ConditionalExpr(Node *Cond_, Node *Then_, Node *Else_) + : Cond(Cond_), Then(Then_), Else(Else_) {} + + void printLeft(OutputStream &S) const override { + S += "("; + Cond->print(S); + S += ") ? ("; + Then->print(S); + S += ") : ("; + Else->print(S); + S += ")"; + } +}; + +class MemberExpr : public Expr { + const Node *LHS; + const StringView Kind; + const Node *RHS; + +public: + MemberExpr(Node *LHS_, StringView Kind_, Node *RHS_) + : LHS(LHS_), Kind(Kind_), RHS(RHS_) {} + + void printLeft(OutputStream &S) const override { + LHS->print(S); + S += Kind; + RHS->print(S); + } +}; + +class EnclosingExpr : public Expr { + const StringView Prefix; + const Node *Infix; + const StringView Postfix; + +public: + EnclosingExpr(StringView Prefix_, Node *Infix_, StringView Postfix_) + : Prefix(Prefix_), Infix(Infix_), Postfix(Postfix_) {} + + void printLeft(OutputStream &S) const override { + S += Prefix; + Infix->print(S); + S += Postfix; + } +}; + +class CastExpr : public Expr { + // cast_kind<to>(from) + const StringView CastKind; + const Node *To; + const Node *From; + +public: + CastExpr(StringView CastKind_, Node *To_, Node *From_) + : CastKind(CastKind_), To(To_), From(From_) {} + + void printLeft(OutputStream &S) const override { + S += CastKind; + S += "<"; + To->printLeft(S); + S += ">("; + From->printLeft(S); + S += ")"; + } +}; + +class SizeofParamPackExpr : public Expr { + Node *Pack; + +public: + SizeofParamPackExpr(Node *Pack_) : Pack(Pack_) {} + + void printLeft(OutputStream &S) const override { + S += "sizeof...("; + ParameterPackExpansion PPE(Pack); + PPE.printLeft(S); + S += ")"; + } +}; + +class CallExpr : public Expr { + const Node *Callee; + NodeArray Args; + +public: + CallExpr(Node *Callee_, NodeArray Args_) : Callee(Callee_), Args(Args_) {} + + void printLeft(OutputStream &S) const override { + Callee->print(S); + S += "("; + Args.printWithComma(S); + S += ")"; + } +}; + +class NewExpr : public Expr { + // new (expr_list) type(init_list) + NodeArray ExprList; + Node *Type; + NodeArray InitList; + bool IsGlobal; // ::operator new ? + bool IsArray; // new[] ? +public: + NewExpr(NodeArray ExprList_, Node *Type_, NodeArray InitList_, bool IsGlobal_, + bool IsArray_) + : ExprList(ExprList_), Type(Type_), InitList(InitList_), + IsGlobal(IsGlobal_), IsArray(IsArray_) {} + + void printLeft(OutputStream &S) const override { + if (IsGlobal) + S += "::operator "; + S += "new"; + if (IsArray) + S += "[]"; + S += ' '; + if (!ExprList.empty()) { + S += "("; + ExprList.printWithComma(S); + S += ")"; + } + Type->print(S); + if (!InitList.empty()) { + S += "("; + InitList.printWithComma(S); + S += ")"; + } + + } +}; + +class DeleteExpr : public Expr { + Node *Op; + bool IsGlobal; + bool IsArray; + +public: + DeleteExpr(Node *Op_, bool IsGlobal_, bool IsArray_) + : Op(Op_), IsGlobal(IsGlobal_), IsArray(IsArray_) {} + + void printLeft(OutputStream &S) const override { + if (IsGlobal) + S += "::"; + S += "delete"; + if (IsArray) + S += "[] "; + Op->print(S); + } +}; + +class PrefixExpr : public Expr { + StringView Prefix; + Node *Child; + +public: + PrefixExpr(StringView Prefix_, Node *Child_) : Prefix(Prefix_), Child(Child_) {} + + void printLeft(OutputStream &S) const override { + S += Prefix; + S += "("; + Child->print(S); + S += ")"; + } +}; + +class FunctionParam : public Expr { + StringView Number; + +public: + FunctionParam(StringView Number_) : Number(Number_) {} + + void printLeft(OutputStream &S) const override { + S += "fp"; + S += Number; + } +}; + +class ConversionExpr : public Expr { + const Node *Type; + NodeArray Expressions; + +public: + ConversionExpr(const Node *Type_, NodeArray Expressions_) + : Type(Type_), Expressions(Expressions_) {} + + void printLeft(OutputStream &S) const override { + S += "("; + Type->print(S); + S += ")("; + Expressions.printWithComma(S); + S += ")"; + } +}; + +class InitListExpr : public Expr { + Node *Ty; + NodeArray Inits; +public: + InitListExpr(Node *Ty_, NodeArray Inits_) : Ty(Ty_), Inits(Inits_) {} + + void printLeft(OutputStream &S) const override { + if (Ty) + Ty->print(S); + S += '{'; + Inits.printWithComma(S); + S += '}'; + } +}; + +class BracedExpr : public Expr { + Node *Elem; + Node *Init; + bool IsArray; +public: + BracedExpr(Node *Elem_, Node *Init_, bool IsArray_) + : Expr(KBracedExpr), Elem(Elem_), Init(Init_), IsArray(IsArray_) {} + + void printLeft(OutputStream &S) const override { + if (IsArray) { + S += '['; + Elem->print(S); + S += ']'; + } else { + S += '.'; + Elem->print(S); + } + if (Init->getKind() != KBracedExpr && Init->getKind() != KBracedRangeExpr) + S += " = "; + Init->print(S); + } +}; + +class BracedRangeExpr : public Expr { + Node *First; + Node *Last; + Node *Init; +public: + BracedRangeExpr(Node *First_, Node *Last_, Node *Init_) + : Expr(KBracedRangeExpr), First(First_), Last(Last_), Init(Init_) {} + + void printLeft(OutputStream &S) const override { + S += '['; + First->print(S); + S += " ... "; + Last->print(S); + S += ']'; + if (Init->getKind() != KBracedExpr && Init->getKind() != KBracedRangeExpr) + S += " = "; + Init->print(S); + } +}; + +struct FoldExpr : Expr { + Node *Pack, *Init; + StringView OperatorName; + bool IsLeftFold; + + FoldExpr(bool IsLeftFold_, StringView OperatorName_, Node *Pack_, Node *Init_) + : Pack(Pack_), Init(Init_), OperatorName(OperatorName_), + IsLeftFold(IsLeftFold_) {} + + void printLeft(OutputStream &S) const override { + auto PrintPack = [&] { + S += '('; + ParameterPackExpansion(Pack).print(S); + S += ')'; + }; + + S += '('; + + if (IsLeftFold) { + // init op ... op pack + if (Init != nullptr) { + Init->print(S); + S += ' '; + S += OperatorName; + S += ' '; + } + // ... op pack + S += "... "; + S += OperatorName; + S += ' '; + PrintPack(); + } else { // !IsLeftFold + // pack op ... + PrintPack(); + S += ' '; + S += OperatorName; + S += " ..."; + // pack op ... op init + if (Init != nullptr) { + S += ' '; + S += OperatorName; + S += ' '; + Init->print(S); + } + } + S += ')'; + } +}; + +class ThrowExpr : public Expr { + const Node *Op; + +public: + ThrowExpr(Node *Op_) : Op(Op_) {} + + void printLeft(OutputStream &S) const override { + S += "throw "; + Op->print(S); + } +}; + +class BoolExpr : public Expr { + bool Value; + +public: + BoolExpr(bool Value_) : Value(Value_) {} + + void printLeft(OutputStream &S) const override { + S += Value ? StringView("true") : StringView("false"); + } +}; + +class IntegerCastExpr : public Expr { + // ty(integer) + Node *Ty; + StringView Integer; + +public: + IntegerCastExpr(Node *Ty_, StringView Integer_) + : Ty(Ty_), Integer(Integer_) {} + + void printLeft(OutputStream &S) const override { + S += "("; + Ty->print(S); + S += ")"; + S += Integer; + } +}; + +class IntegerExpr : public Expr { + StringView Type; + StringView Value; + +public: + IntegerExpr(StringView Type_, StringView Value_) : Type(Type_), Value(Value_) {} + + void printLeft(OutputStream &S) const override { + if (Type.size() > 3) { + S += "("; + S += Type; + S += ")"; + } + + if (Value[0] == 'n') { + S += "-"; + S += Value.dropFront(1); + } else + S += Value; + + if (Type.size() <= 3) + S += Type; + } +}; + +template <class Float> struct FloatData; + +template <class Float> class FloatExpr : public Expr { + const StringView Contents; + +public: + FloatExpr(StringView Contents_) : Contents(Contents_) {} + + void printLeft(OutputStream &s) const override { + const char *first = Contents.begin(); + const char *last = Contents.end() + 1; + + const size_t N = FloatData<Float>::mangled_size; + if (static_cast<std::size_t>(last - first) > N) { + last = first + N; + union { + Float value; + char buf[sizeof(Float)]; + }; + const char *t = first; + char *e = buf; + for (; t != last; ++t, ++e) { + unsigned d1 = isdigit(*t) ? static_cast<unsigned>(*t - '0') + : static_cast<unsigned>(*t - 'a' + 10); + ++t; + unsigned d0 = isdigit(*t) ? static_cast<unsigned>(*t - '0') + : static_cast<unsigned>(*t - 'a' + 10); + *e = static_cast<char>((d1 << 4) + d0); + } +#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ + std::reverse(buf, e); +#endif + char num[FloatData<Float>::max_demangled_size] = {0}; + int n = snprintf(num, sizeof(num), FloatData<Float>::spec, value); + s += StringView(num, num + n); + } + } +}; + +class BumpPointerAllocator { + struct BlockMeta { + BlockMeta* Next; + size_t Current; + }; + + static constexpr size_t AllocSize = 4096; + static constexpr size_t UsableAllocSize = AllocSize - sizeof(BlockMeta); + + alignas(long double) char InitialBuffer[AllocSize]; + BlockMeta* BlockList = nullptr; + + void grow() { + char* NewMeta = static_cast<char *>(std::malloc(AllocSize)); + if (NewMeta == nullptr) + std::terminate(); + BlockList = new (NewMeta) BlockMeta{BlockList, 0}; + } + + void* allocateMassive(size_t NBytes) { + NBytes += sizeof(BlockMeta); + BlockMeta* NewMeta = reinterpret_cast<BlockMeta*>(std::malloc(NBytes)); + if (NewMeta == nullptr) + std::terminate(); + BlockList->Next = new (NewMeta) BlockMeta{BlockList->Next, 0}; + return static_cast<void*>(NewMeta + 1); + } + +public: + BumpPointerAllocator() + : BlockList(new (InitialBuffer) BlockMeta{nullptr, 0}) {} + + void* allocate(size_t N) { + N = (N + 15u) & ~15u; + if (N + BlockList->Current >= UsableAllocSize) { + if (N > UsableAllocSize) + return allocateMassive(N); + grow(); + } + BlockList->Current += N; + return static_cast<void*>(reinterpret_cast<char*>(BlockList + 1) + + BlockList->Current - N); + } + + void reset() { + while (BlockList) { + BlockMeta* Tmp = BlockList; + BlockList = BlockList->Next; + if (reinterpret_cast<char*>(Tmp) != InitialBuffer) + std::free(Tmp); + } + BlockList = new (InitialBuffer) BlockMeta{nullptr, 0}; + } + + ~BumpPointerAllocator() { reset(); } +}; + +template <class T, size_t N> +class PODSmallVector { + static_assert(std::is_pod<T>::value, + "T is required to be a plain old data type"); + + T* First; + T* Last; + T* Cap; + T Inline[N]; + + bool isInline() const { return First == Inline; } + + void clearInline() { + First = Inline; + Last = Inline; + Cap = Inline + N; + } + + void reserve(size_t NewCap) { + size_t S = size(); + if (isInline()) { + auto* Tmp = static_cast<T*>(std::malloc(NewCap * sizeof(T))); + if (Tmp == nullptr) + std::terminate(); + std::copy(First, Last, Tmp); + First = Tmp; + } else { + First = static_cast<T*>(std::realloc(First, NewCap * sizeof(T))); + if (First == nullptr) + std::terminate(); + } + Last = First + S; + Cap = First + NewCap; + } + +public: + PODSmallVector() : First(Inline), Last(First), Cap(Inline + N) {} + + PODSmallVector(const PODSmallVector&) = delete; + PODSmallVector& operator=(const PODSmallVector&) = delete; + + PODSmallVector(PODSmallVector&& Other) : PODSmallVector() { + if (Other.isInline()) { + std::copy(Other.begin(), Other.end(), First); + Last = First + Other.size(); + Other.clear(); + return; + } + + First = Other.First; + Last = Other.Last; + Cap = Other.Cap; + Other.clearInline(); + } + + PODSmallVector& operator=(PODSmallVector&& Other) { + if (Other.isInline()) { + if (!isInline()) { + std::free(First); + clearInline(); + } + std::copy(Other.begin(), Other.end(), First); + Last = First + Other.size(); + Other.clear(); + return *this; + } + + if (isInline()) { + First = Other.First; + Last = Other.Last; + Cap = Other.Cap; + Other.clearInline(); + return *this; + } + + std::swap(First, Other.First); + std::swap(Last, Other.Last); + std::swap(Cap, Other.Cap); + Other.clear(); + return *this; + } + + void push_back(const T& Elem) { + if (Last == Cap) + reserve(size() * 2); + *Last++ = Elem; + } + + void pop_back() { + assert(Last != First && "Popping empty vector!"); + --Last; + } + + void dropBack(size_t Index) { + assert(Index <= size() && "dropBack() can't expand!"); + Last = First + Index; + } + + T* begin() { return First; } + T* end() { return Last; } + + bool empty() const { return First == Last; } + size_t size() const { return static_cast<size_t>(Last - First); } + T& back() { + assert(Last != First && "Calling back() on empty vector!"); + return *(Last - 1); + } + T& operator[](size_t Index) { + assert(Index < size() && "Invalid access!"); + return *(begin() + Index); + } + void clear() { Last = First; } + + ~PODSmallVector() { + if (!isInline()) + std::free(First); + } +}; + +struct Db { + const char *First; + const char *Last; + + // Name stack, this is used by the parser to hold temporary names that were + // parsed. The parser collapses multiple names into new nodes to construct + // the AST. Once the parser is finished, names.size() == 1. + PODSmallVector<Node *, 32> Names; + + // Substitution table. Itanium supports name substitutions as a means of + // compression. The string "S42_" refers to the 44nd entry (base-36) in this + // table. + PODSmallVector<Node *, 32> Subs; + + // Template parameter table. Like the above, but referenced like "T42_". + // This has a smaller size compared to Subs and Names because it can be + // stored on the stack. + PODSmallVector<Node *, 8> TemplateParams; + + // Set of unresolved forward <template-param> references. These can occur in a + // conversion operator's type, and are resolved in the enclosing <encoding>. + PODSmallVector<ForwardTemplateReference *, 4> ForwardTemplateRefs; + + bool TryToParseTemplateArgs = true; + bool PermitForwardTemplateReferences = false; + bool ParsingLambdaParams = false; + + BumpPointerAllocator ASTAllocator; + + Db(const char *First_, const char *Last_) : First(First_), Last(Last_) {} + + void reset(const char *First_, const char *Last_) { + First = First_; + Last = Last_; + Names.clear(); + Subs.clear(); + TemplateParams.clear(); + ParsingLambdaParams = false; + TryToParseTemplateArgs = true; + PermitForwardTemplateReferences = false; + ASTAllocator.reset(); + } + + template <class T, class... Args> T *make(Args &&... args) { + return new (ASTAllocator.allocate(sizeof(T))) + T(std::forward<Args>(args)...); + } + + template <class It> NodeArray makeNodeArray(It begin, It end) { + size_t sz = static_cast<size_t>(end - begin); + void *mem = ASTAllocator.allocate(sizeof(Node *) * sz); + Node **data = new (mem) Node *[sz]; + std::copy(begin, end, data); + return NodeArray(data, sz); + } + + NodeArray popTrailingNodeArray(size_t FromPosition) { + assert(FromPosition <= Names.size()); + NodeArray res = + makeNodeArray(Names.begin() + (long)FromPosition, Names.end()); + Names.dropBack(FromPosition); + return res; + } + + bool consumeIf(StringView S) { + if (StringView(First, Last).startsWith(S)) { + First += S.size(); + return true; + } + return false; + } + + bool consumeIf(char C) { + if (First != Last && *First == C) { + ++First; + return true; + } + return false; + } + + char consume() { return First != Last ? *First++ : '\0'; } + + char look(unsigned Lookahead = 0) { + if (static_cast<size_t>(Last - First) <= Lookahead) + return '\0'; + return First[Lookahead]; + } + + size_t numLeft() const { return static_cast<size_t>(Last - First); } + + StringView parseNumber(bool AllowNegative = false); + Qualifiers parseCVQualifiers(); + bool parsePositiveInteger(size_t *Out); + StringView parseBareSourceName(); + + bool parseSeqId(size_t *Out); + Node *parseSubstitution(); + Node *parseTemplateParam(); + Node *parseTemplateArgs(bool TagTemplates = false); + Node *parseTemplateArg(); + + /// Parse the <expr> production. + Node *parseExpr(); + Node *parsePrefixExpr(StringView Kind); + Node *parseBinaryExpr(StringView Kind); + Node *parseIntegerLiteral(StringView Lit); + Node *parseExprPrimary(); + template <class Float> Node *parseFloatingLiteral(); + Node *parseFunctionParam(); + Node *parseNewExpr(); + Node *parseConversionExpr(); + Node *parseBracedExpr(); + Node *parseFoldExpr(); + + /// Parse the <type> production. + Node *parseType(); + Node *parseFunctionType(); + Node *parseVectorType(); + Node *parseDecltype(); + Node *parseArrayType(); + Node *parsePointerToMemberType(); + Node *parseClassEnumType(); + Node *parseQualifiedType(); + + Node *parseEncoding(); + bool parseCallOffset(); + Node *parseSpecialName(); + + /// Holds some extra information about a <name> that is being parsed. This + /// information is only pertinent if the <name> refers to an <encoding>. + struct NameState { + bool CtorDtorConversion = false; + bool EndsWithTemplateArgs = false; + Qualifiers CVQualifiers = QualNone; + FunctionRefQual ReferenceQualifier = FrefQualNone; + size_t ForwardTemplateRefsBegin; + + NameState(Db *Enclosing) + : ForwardTemplateRefsBegin(Enclosing->ForwardTemplateRefs.size()) {} + }; + + bool resolveForwardTemplateRefs(NameState &State) { + size_t I = State.ForwardTemplateRefsBegin; + size_t E = ForwardTemplateRefs.size(); + for (; I < E; ++I) { + size_t Idx = ForwardTemplateRefs[I]->Index; + if (Idx >= TemplateParams.size()) + return true; + ForwardTemplateRefs[I]->Ref = TemplateParams[Idx]; + } + ForwardTemplateRefs.dropBack(State.ForwardTemplateRefsBegin); + return false; + } + + /// Parse the <name> production> + Node *parseName(NameState *State = nullptr); + Node *parseLocalName(NameState *State); + Node *parseOperatorName(NameState *State); + Node *parseUnqualifiedName(NameState *State); + Node *parseUnnamedTypeName(NameState *State); + Node *parseSourceName(NameState *State); + Node *parseUnscopedName(NameState *State); + Node *parseNestedName(NameState *State); + Node *parseCtorDtorName(Node *&SoFar, NameState *State); + + Node *parseAbiTags(Node *N); + + /// Parse the <unresolved-name> production. + Node *parseUnresolvedName(); + Node *parseSimpleId(); + Node *parseBaseUnresolvedName(); + Node *parseUnresolvedType(); + Node *parseDestructorName(); + + /// Top-level entry point into the parser. + Node *parse(); +}; + +const char* parse_discriminator(const char* first, const char* last); + +// <name> ::= <nested-name> // N +// ::= <local-name> # See Scope Encoding below // Z +// ::= <unscoped-template-name> <template-args> +// ::= <unscoped-name> +// +// <unscoped-template-name> ::= <unscoped-name> +// ::= <substitution> +Node *Db::parseName(NameState *State) { + consumeIf('L'); // extension + + if (look() == 'N') + return parseNestedName(State); + if (look() == 'Z') + return parseLocalName(State); + + // ::= <unscoped-template-name> <template-args> + if (look() == 'S' && look(1) != 't') { + Node *S = parseSubstitution(); + if (S == nullptr) + return nullptr; + if (look() != 'I') + return nullptr; + Node *TA = parseTemplateArgs(State != nullptr); + if (TA == nullptr) + return nullptr; + if (State) State->EndsWithTemplateArgs = true; + return make<NameWithTemplateArgs>(S, TA); + } + + Node *N = parseUnscopedName(State); + if (N == nullptr) + return nullptr; + // ::= <unscoped-template-name> <template-args> + if (look() == 'I') { + Subs.push_back(N); + Node *TA = parseTemplateArgs(State != nullptr); + if (TA == nullptr) + return nullptr; + if (State) State->EndsWithTemplateArgs = true; + return make<NameWithTemplateArgs>(N, TA); + } + // ::= <unscoped-name> + return N; +} + +// <local-name> := Z <function encoding> E <entity name> [<discriminator>] +// := Z <function encoding> E s [<discriminator>] +// := Z <function encoding> Ed [ <parameter number> ] _ <entity name> +Node *Db::parseLocalName(NameState *State) { + if (!consumeIf('Z')) + return nullptr; + Node *Encoding = parseEncoding(); + if (Encoding == nullptr || !consumeIf('E')) + return nullptr; + + if (consumeIf('s')) { + First = parse_discriminator(First, Last); + return make<LocalName>(Encoding, make<NameType>("string literal")); + } + + if (consumeIf('d')) { + parseNumber(true); + if (!consumeIf('_')) + return nullptr; + Node *N = parseName(State); + if (N == nullptr) + return nullptr; + return make<LocalName>(Encoding, N); + } + + Node *Entity = parseName(State); + if (Entity == nullptr) + return nullptr; + First = parse_discriminator(First, Last); + return make<LocalName>(Encoding, Entity); +} + +// <unscoped-name> ::= <unqualified-name> +// ::= St <unqualified-name> # ::std:: +// extension ::= StL<unqualified-name> +Node *Db::parseUnscopedName(NameState *State) { + if (consumeIf("StL") || consumeIf("St")) { + Node *R = parseUnqualifiedName(State); + if (R == nullptr) + return nullptr; + return make<StdQualifiedName>(R); + } + return parseUnqualifiedName(State); +} + +// <unqualified-name> ::= <operator-name> [abi-tags] +// ::= <ctor-dtor-name> +// ::= <source-name> +// ::= <unnamed-type-name> +// ::= DC <source-name>+ E # structured binding declaration +Node *Db::parseUnqualifiedName(NameState *State) { + // <ctor-dtor-name>s are special-cased in parseNestedName(). + Node *Result; + if (look() == 'U') + Result = parseUnnamedTypeName(State); + else if (look() >= '1' && look() <= '9') + Result = parseSourceName(State); + else if (consumeIf("DC")) { + size_t BindingsBegin = Names.size(); + do { + Node *Binding = parseSourceName(State); + if (Binding == nullptr) + return nullptr; + Names.push_back(Binding); + } while (!consumeIf('E')); + Result = make<StructuredBindingName>(popTrailingNodeArray(BindingsBegin)); + } else + Result = parseOperatorName(State); + if (Result != nullptr) + Result = parseAbiTags(Result); + return Result; +} + +// <unnamed-type-name> ::= Ut [<nonnegative number>] _ +// ::= <closure-type-name> +// +// <closure-type-name> ::= Ul <lambda-sig> E [ <nonnegative number> ] _ +// +// <lambda-sig> ::= <parameter type>+ # Parameter types or "v" if the lambda has no parameters +Node *Db::parseUnnamedTypeName(NameState *) { + if (consumeIf("Ut")) { + StringView Count = parseNumber(); + if (!consumeIf('_')) + return nullptr; + return make<UnnamedTypeName>(Count); + } + if (consumeIf("Ul")) { + NodeArray Params; + SwapAndRestore<bool> SwapParams(ParsingLambdaParams, true); + if (!consumeIf("vE")) { + size_t ParamsBegin = Names.size(); + do { + Node *P = parseType(); + if (P == nullptr) + return nullptr; + Names.push_back(P); + } while (!consumeIf('E')); + Params = popTrailingNodeArray(ParamsBegin); + } + StringView Count = parseNumber(); + if (!consumeIf('_')) + return nullptr; + return make<ClosureTypeName>(Params, Count); + } + return nullptr; +} + +// <source-name> ::= <positive length number> <identifier> +Node *Db::parseSourceName(NameState *) { + size_t Length = 0; + if (parsePositiveInteger(&Length)) + return nullptr; + if (numLeft() < Length || Length == 0) + return nullptr; + StringView Name(First, First + Length); + First += Length; + if (Name.startsWith("_GLOBAL__N")) + return make<NameType>("(anonymous namespace)"); + return make<NameType>(Name); +} + +// <operator-name> ::= aa # && +// ::= ad # & (unary) +// ::= an # & +// ::= aN # &= +// ::= aS # = +// ::= cl # () +// ::= cm # , +// ::= co # ~ +// ::= cv <type> # (cast) +// ::= da # delete[] +// ::= de # * (unary) +// ::= dl # delete +// ::= dv # / +// ::= dV # /= +// ::= eo # ^ +// ::= eO # ^= +// ::= eq # == +// ::= ge # >= +// ::= gt # > +// ::= ix # [] +// ::= le # <= +// ::= li <source-name> # operator "" +// ::= ls # << +// ::= lS # <<= +// ::= lt # < +// ::= mi # - +// ::= mI # -= +// ::= ml # * +// ::= mL # *= +// ::= mm # -- (postfix in <expression> context) +// ::= na # new[] +// ::= ne # != +// ::= ng # - (unary) +// ::= nt # ! +// ::= nw # new +// ::= oo # || +// ::= or # | +// ::= oR # |= +// ::= pm # ->* +// ::= pl # + +// ::= pL # += +// ::= pp # ++ (postfix in <expression> context) +// ::= ps # + (unary) +// ::= pt # -> +// ::= qu # ? +// ::= rm # % +// ::= rM # %= +// ::= rs # >> +// ::= rS # >>= +// ::= ss # <=> C++2a +// ::= v <digit> <source-name> # vendor extended operator +Node *Db::parseOperatorName(NameState *State) { + switch (look()) { + case 'a': + switch (look(1)) { + case 'a': + First += 2; + return make<NameType>("operator&&"); + case 'd': + case 'n': + First += 2; + return make<NameType>("operator&"); + case 'N': + First += 2; + return make<NameType>("operator&="); + case 'S': + First += 2; + return make<NameType>("operator="); + } + return nullptr; + case 'c': + switch (look(1)) { + case 'l': + First += 2; + return make<NameType>("operator()"); + case 'm': + First += 2; + return make<NameType>("operator,"); + case 'o': + First += 2; + return make<NameType>("operator~"); + // ::= cv <type> # (cast) + case 'v': { + First += 2; + SwapAndRestore<bool> SaveTemplate(TryToParseTemplateArgs, false); + // If we're parsing an encoding, State != nullptr and the conversion + // operators' <type> could have a <template-param> that refers to some + // <template-arg>s further ahead in the mangled name. + SwapAndRestore<bool> SavePermit(PermitForwardTemplateReferences, + PermitForwardTemplateReferences || + State != nullptr); + Node* Ty = parseType(); + if (Ty == nullptr) + return nullptr; + if (State) State->CtorDtorConversion = true; + return make<ConversionOperatorType>(Ty); + } + } + return nullptr; + case 'd': + switch (look(1)) { + case 'a': + First += 2; + return make<NameType>("operator delete[]"); + case 'e': + First += 2; + return make<NameType>("operator*"); + case 'l': + First += 2; + return make<NameType>("operator delete"); + case 'v': + First += 2; + return make<NameType>("operator/"); + case 'V': + First += 2; + return make<NameType>("operator/="); + } + return nullptr; + case 'e': + switch (look(1)) { + case 'o': + First += 2; + return make<NameType>("operator^"); + case 'O': + First += 2; + return make<NameType>("operator^="); + case 'q': + First += 2; + return make<NameType>("operator=="); + } + return nullptr; + case 'g': + switch (look(1)) { + case 'e': + First += 2; + return make<NameType>("operator>="); + case 't': + First += 2; + return make<NameType>("operator>"); + } + return nullptr; + case 'i': + if (look(1) == 'x') { + First += 2; + return make<NameType>("operator[]"); + } + return nullptr; + case 'l': + switch (look(1)) { + case 'e': + First += 2; + return make<NameType>("operator<="); + // ::= li <source-name> # operator "" + case 'i': { + First += 2; + Node *SN = parseSourceName(State); + if (SN == nullptr) + return nullptr; + return make<LiteralOperator>(SN); + } + case 's': + First += 2; + return make<NameType>("operator<<"); + case 'S': + First += 2; + return make<NameType>("operator<<="); + case 't': + First += 2; + return make<NameType>("operator<"); + } + return nullptr; + case 'm': + switch (look(1)) { + case 'i': + First += 2; + return make<NameType>("operator-"); + case 'I': + First += 2; + return make<NameType>("operator-="); + case 'l': + First += 2; + return make<NameType>("operator*"); + case 'L': + First += 2; + return make<NameType>("operator*="); + case 'm': + First += 2; + return make<NameType>("operator--"); + } + return nullptr; + case 'n': + switch (look(1)) { + case 'a': + First += 2; + return make<NameType>("operator new[]"); + case 'e': + First += 2; + return make<NameType>("operator!="); + case 'g': + First += 2; + return make<NameType>("operator-"); + case 't': + First += 2; + return make<NameType>("operator!"); + case 'w': + First += 2; + return make<NameType>("operator new"); + } + return nullptr; + case 'o': + switch (look(1)) { + case 'o': + First += 2; + return make<NameType>("operator||"); + case 'r': + First += 2; + return make<NameType>("operator|"); + case 'R': + First += 2; + return make<NameType>("operator|="); + } + return nullptr; + case 'p': + switch (look(1)) { + case 'm': + First += 2; + return make<NameType>("operator->*"); + case 'l': + First += 2; + return make<NameType>("operator+"); + case 'L': + First += 2; + return make<NameType>("operator+="); + case 'p': + First += 2; + return make<NameType>("operator++"); + case 's': + First += 2; + return make<NameType>("operator+"); + case 't': + First += 2; + return make<NameType>("operator->"); + } + return nullptr; + case 'q': + if (look(1) == 'u') { + First += 2; + return make<NameType>("operator?"); + } + return nullptr; + case 'r': + switch (look(1)) { + case 'm': + First += 2; + return make<NameType>("operator%"); + case 'M': + First += 2; + return make<NameType>("operator%="); + case 's': + First += 2; + return make<NameType>("operator>>"); + case 'S': + First += 2; + return make<NameType>("operator>>="); + } + return nullptr; + case 's': + if (look(1) == 's') { + First += 2; + return make<NameType>("operator<=>"); + } + return nullptr; + // ::= v <digit> <source-name> # vendor extended operator + case 'v': + if (std::isdigit(look(1))) { + First += 2; + Node *SN = parseSourceName(State); + if (SN == nullptr) + return nullptr; + return make<ConversionOperatorType>(SN); + } + return nullptr; + } + return nullptr; +} + +// <ctor-dtor-name> ::= C1 # complete object constructor +// ::= C2 # base object constructor +// ::= C3 # complete object allocating constructor +// extension ::= C5 # ? +// ::= D0 # deleting destructor +// ::= D1 # complete object destructor +// ::= D2 # base object destructor +// extension ::= D5 # ? +Node *Db::parseCtorDtorName(Node *&SoFar, NameState *State) { + if (SoFar->K == Node::KSpecialSubstitution) { + auto SSK = static_cast<SpecialSubstitution *>(SoFar)->SSK; + switch (SSK) { + case SpecialSubKind::string: + case SpecialSubKind::istream: + case SpecialSubKind::ostream: + case SpecialSubKind::iostream: + SoFar = make<ExpandedSpecialSubstitution>(SSK); + default: + break; + } + } + + if (consumeIf('C')) { + bool IsInherited = consumeIf('I'); + if (look() != '1' && look() != '2' && look() != '3' && look() != '5') + return nullptr; + ++First; + if (State) State->CtorDtorConversion = true; + if (IsInherited) { + if (parseName(State) == nullptr) + return nullptr; + } + return make<CtorDtorName>(SoFar, false); + } + + if (look() == 'D' && + (look(1) == '0' || look(1) == '1' || look(1) == '2' || look(1) == '5')) { + First += 2; + if (State) State->CtorDtorConversion = true; + return make<CtorDtorName>(SoFar, true); + } + + return nullptr; +} + +// <nested-name> ::= N [<CV-Qualifiers>] [<ref-qualifier>] <prefix> <unqualified-name> E +// ::= N [<CV-Qualifiers>] [<ref-qualifier>] <template-prefix> <template-args> E +// +// <prefix> ::= <prefix> <unqualified-name> +// ::= <template-prefix> <template-args> +// ::= <template-param> +// ::= <decltype> +// ::= # empty +// ::= <substitution> +// ::= <prefix> <data-member-prefix> +// extension ::= L +// +// <data-member-prefix> := <member source-name> [<template-args>] M +// +// <template-prefix> ::= <prefix> <template unqualified-name> +// ::= <template-param> +// ::= <substitution> +Node *Db::parseNestedName(NameState *State) { + if (!consumeIf('N')) + return nullptr; + + Qualifiers CVTmp = parseCVQualifiers(); + if (State) State->CVQualifiers = CVTmp; + + if (consumeIf('O')) { + if (State) State->ReferenceQualifier = FrefQualRValue; + } else if (consumeIf('R')) { + if (State) State->ReferenceQualifier = FrefQualLValue; + } else + if (State) State->ReferenceQualifier = FrefQualNone; + + Node *SoFar = nullptr; + auto PushComponent = [&](Node *Comp) { + if (SoFar) SoFar = make<NestedName>(SoFar, Comp); + else SoFar = Comp; + if (State) State->EndsWithTemplateArgs = false; + }; + + if (consumeIf("St")) + SoFar = make<NameType>("std"); + + while (!consumeIf('E')) { + consumeIf('L'); // extension + + // <data-member-prefix> := <member source-name> [<template-args>] M + if (consumeIf('M')) { + if (SoFar == nullptr) + return nullptr; + continue; + } + + // ::= <template-param> + if (look() == 'T') { + Node *TP = parseTemplateParam(); + if (TP == nullptr) + return nullptr; + PushComponent(TP); + Subs.push_back(SoFar); + continue; + } + + // ::= <template-prefix> <template-args> + if (look() == 'I') { + Node *TA = parseTemplateArgs(State != nullptr); + if (TA == nullptr || SoFar == nullptr) + return nullptr; + SoFar = make<NameWithTemplateArgs>(SoFar, TA); + if (State) State->EndsWithTemplateArgs = true; + Subs.push_back(SoFar); + continue; + } + + // ::= <decltype> + if (look() == 'D' && (look(1) == 't' || look(1) == 'T')) { + Node *DT = parseDecltype(); + if (DT == nullptr) + return nullptr; + PushComponent(DT); + Subs.push_back(SoFar); + continue; + } + + // ::= <substitution> + if (look() == 'S' && look(1) != 't') { + Node *S = parseSubstitution(); + if (S == nullptr) + return nullptr; + PushComponent(S); + if (SoFar != S) + Subs.push_back(S); + continue; + } + + // Parse an <unqualified-name> thats actually a <ctor-dtor-name>. + if (look() == 'C' || (look() == 'D' && look(1) != 'C')) { + if (SoFar == nullptr) + return nullptr; + Node *CtorDtor = parseCtorDtorName(SoFar, State); + if (CtorDtor == nullptr) + return nullptr; + PushComponent(CtorDtor); + SoFar = parseAbiTags(SoFar); + if (SoFar == nullptr) + return nullptr; + Subs.push_back(SoFar); + continue; + } + + // ::= <prefix> <unqualified-name> + Node *N = parseUnqualifiedName(State); + if (N == nullptr) + return nullptr; + PushComponent(N); + Subs.push_back(SoFar); + } + + if (SoFar == nullptr || Subs.empty()) + return nullptr; + + Subs.pop_back(); + return SoFar; +} + +// <simple-id> ::= <source-name> [ <template-args> ] +Node *Db::parseSimpleId() { + Node *SN = parseSourceName(/*NameState=*/nullptr); + if (SN == nullptr) + return nullptr; + if (look() == 'I') { + Node *TA = parseTemplateArgs(); + if (TA == nullptr) + return nullptr; + return make<NameWithTemplateArgs>(SN, TA); + } + return SN; +} + +// <destructor-name> ::= <unresolved-type> # e.g., ~T or ~decltype(f()) +// ::= <simple-id> # e.g., ~A<2*N> +Node *Db::parseDestructorName() { + Node *Result; + if (std::isdigit(look())) + Result = parseSimpleId(); + else + Result = parseUnresolvedType(); + if (Result == nullptr) + return nullptr; + return make<DtorName>(Result); +} + +// <unresolved-type> ::= <template-param> +// ::= <decltype> +// ::= <substitution> +Node *Db::parseUnresolvedType() { + if (look() == 'T') { + Node *TP = parseTemplateParam(); + if (TP == nullptr) + return nullptr; + Subs.push_back(TP); + return TP; + } + if (look() == 'D') { + Node *DT = parseDecltype(); + if (DT == nullptr) + return nullptr; + Subs.push_back(DT); + return DT; + } + return parseSubstitution(); +} + +// <base-unresolved-name> ::= <simple-id> # unresolved name +// extension ::= <operator-name> # unresolved operator-function-id +// extension ::= <operator-name> <template-args> # unresolved operator template-id +// ::= on <operator-name> # unresolved operator-function-id +// ::= on <operator-name> <template-args> # unresolved operator template-id +// ::= dn <destructor-name> # destructor or pseudo-destructor; +// # e.g. ~X or ~X<N-1> +Node *Db::parseBaseUnresolvedName() { + if (std::isdigit(look())) + return parseSimpleId(); + + if (consumeIf("dn")) + return parseDestructorName(); + + consumeIf("on"); + + Node *Oper = parseOperatorName(/*NameState=*/nullptr); + if (Oper == nullptr) + return nullptr; + if (look() == 'I') { + Node *TA = parseTemplateArgs(); + if (TA == nullptr) + return nullptr; + return make<NameWithTemplateArgs>(Oper, TA); + } + return Oper; +} + +// <unresolved-name> +// extension ::= srN <unresolved-type> [<template-args>] <unresolved-qualifier-level>* E <base-unresolved-name> +// ::= [gs] <base-unresolved-name> # x or (with "gs") ::x +// ::= [gs] sr <unresolved-qualifier-level>+ E <base-unresolved-name> +// # A::x, N::y, A<T>::z; "gs" means leading "::" +// ::= sr <unresolved-type> <base-unresolved-name> # T::x / decltype(p)::x +// extension ::= sr <unresolved-type> <template-args> <base-unresolved-name> +// # T::N::x /decltype(p)::N::x +// (ignored) ::= srN <unresolved-type> <unresolved-qualifier-level>+ E <base-unresolved-name> +// +// <unresolved-qualifier-level> ::= <simple-id> +Node *Db::parseUnresolvedName() { + Node *SoFar = nullptr; + + // srN <unresolved-type> [<template-args>] <unresolved-qualifier-level>* E <base-unresolved-name> + // srN <unresolved-type> <unresolved-qualifier-level>+ E <base-unresolved-name> + if (consumeIf("srN")) { + SoFar = parseUnresolvedType(); + if (SoFar == nullptr) + return nullptr; + + if (look() == 'I') { + Node *TA = parseTemplateArgs(); + if (TA == nullptr) + return nullptr; + SoFar = make<NameWithTemplateArgs>(SoFar, TA); + } + + while (!consumeIf('E')) { + Node *Qual = parseSimpleId(); + if (Qual == nullptr) + return nullptr; + SoFar = make<QualifiedName>(SoFar, Qual); + } + + Node *Base = parseBaseUnresolvedName(); + if (Base == nullptr) + return nullptr; + return make<QualifiedName>(SoFar, Base); + } + + bool Global = consumeIf("gs"); + + // [gs] <base-unresolved-name> # x or (with "gs") ::x + if (!consumeIf("sr")) { + SoFar = parseBaseUnresolvedName(); + if (SoFar == nullptr) + return nullptr; + if (Global) + SoFar = make<GlobalQualifiedName>(SoFar); + return SoFar; + } + + // [gs] sr <unresolved-qualifier-level>+ E <base-unresolved-name> + if (std::isdigit(look())) { + do { + Node *Qual = parseSimpleId(); + if (Qual == nullptr) + return nullptr; + if (SoFar) + SoFar = make<QualifiedName>(SoFar, Qual); + else if (Global) + SoFar = make<GlobalQualifiedName>(Qual); + else + SoFar = Qual; + } while (!consumeIf('E')); + } + // sr <unresolved-type> <base-unresolved-name> + // sr <unresolved-type> <template-args> <base-unresolved-name> + else { + SoFar = parseUnresolvedType(); + if (SoFar == nullptr) + return nullptr; + + if (look() == 'I') { + Node *TA = parseTemplateArgs(); + if (TA == nullptr) + return nullptr; + SoFar = make<NameWithTemplateArgs>(SoFar, TA); + } + } + + assert(SoFar != nullptr); + + Node *Base = parseBaseUnresolvedName(); + if (Base == nullptr) + return nullptr; + return make<QualifiedName>(SoFar, Base); +} + +// <abi-tags> ::= <abi-tag> [<abi-tags>] +// <abi-tag> ::= B <source-name> +Node *Db::parseAbiTags(Node *N) { + while (consumeIf('B')) { + StringView SN = parseBareSourceName(); + if (SN.empty()) + return nullptr; + N = make<AbiTagAttr>(N, SN); + } + return N; +} + +// <number> ::= [n] <non-negative decimal integer> +StringView Db::parseNumber(bool AllowNegative) { + const char *Tmp = First; + if (AllowNegative) + consumeIf('n'); + if (numLeft() == 0 || !std::isdigit(*First)) + return StringView(); + while (numLeft() != 0 && std::isdigit(*First)) + ++First; + return StringView(Tmp, First); +} + +// <positive length number> ::= [0-9]* +bool Db::parsePositiveInteger(size_t *Out) { + *Out = 0; + if (look() < '0' || look() > '9') + return true; + while (look() >= '0' && look() <= '9') { + *Out *= 10; + *Out += static_cast<size_t>(consume() - '0'); + } + return false; +} + +StringView Db::parseBareSourceName() { + size_t Int = 0; + if (parsePositiveInteger(&Int) || numLeft() < Int) + return StringView(); + StringView R(First, First + Int); + First += Int; + return R; +} + +// <function-type> ::= [<CV-qualifiers>] [<exception-spec>] [Dx] F [Y] <bare-function-type> [<ref-qualifier>] E +// +// <exception-spec> ::= Do # non-throwing exception-specification (e.g., noexcept, throw()) +// ::= DO <expression> E # computed (instantiation-dependent) noexcept +// ::= Dw <type>+ E # dynamic exception specification with instantiation-dependent types +// +// <ref-qualifier> ::= R # & ref-qualifier +// <ref-qualifier> ::= O # && ref-qualifier +Node *Db::parseFunctionType() { + Qualifiers CVQuals = parseCVQualifiers(); + + Node *ExceptionSpec = nullptr; + if (consumeIf("Do")) { + ExceptionSpec = make<NameType>("noexcept"); + } else if (consumeIf("DO")) { + Node *E = parseExpr(); + if (E == nullptr || !consumeIf('E')) + return nullptr; + ExceptionSpec = make<NoexceptSpec>(E); + } else if (consumeIf("Dw")) { + size_t SpecsBegin = Names.size(); + while (!consumeIf('E')) { + Node *T = parseType(); + if (T == nullptr) + return nullptr; + Names.push_back(T); + } + ExceptionSpec = + make<DynamicExceptionSpec>(popTrailingNodeArray(SpecsBegin)); + } + + consumeIf("Dx"); // transaction safe + + if (!consumeIf('F')) + return nullptr; + consumeIf('Y'); // extern "C" + Node *ReturnType = parseType(); + if (ReturnType == nullptr) + return nullptr; + + FunctionRefQual ReferenceQualifier = FrefQualNone; + size_t ParamsBegin = Names.size(); + while (true) { + if (consumeIf('E')) + break; + if (consumeIf('v')) + continue; + if (consumeIf("RE")) { + ReferenceQualifier = FrefQualLValue; + break; + } + if (consumeIf("OE")) { + ReferenceQualifier = FrefQualRValue; + break; + } + Node *T = parseType(); + if (T == nullptr) + return nullptr; + Names.push_back(T); + } + + NodeArray Params = popTrailingNodeArray(ParamsBegin); + return make<FunctionType>(ReturnType, Params, CVQuals, + ReferenceQualifier, ExceptionSpec); +} + +// extension: +// <vector-type> ::= Dv <positive dimension number> _ <extended element type> +// ::= Dv [<dimension expression>] _ <element type> +// <extended element type> ::= <element type> +// ::= p # AltiVec vector pixel +Node *Db::parseVectorType() { + if (!consumeIf("Dv")) + return nullptr; + if (look() >= '1' && look() <= '9') { + StringView DimensionNumber = parseNumber(); + if (!consumeIf('_')) + return nullptr; + if (consumeIf('p')) + return make<VectorType>(DimensionNumber); + Node *ElemType = parseType(); + if (ElemType == nullptr) + return nullptr; + return make<VectorType>(ElemType, DimensionNumber); + } + + if (!consumeIf('_')) { + Node *DimExpr = parseExpr(); + if (!DimExpr) + return nullptr; + if (!consumeIf('_')) + return nullptr; + Node *ElemType = parseType(); + if (!ElemType) + return nullptr; + return make<VectorType>(ElemType, DimExpr); + } + Node *ElemType = parseType(); + if (!ElemType) + return nullptr; + return make<VectorType>(ElemType, StringView()); +} + +// <decltype> ::= Dt <expression> E # decltype of an id-expression or class member access (C++0x) +// ::= DT <expression> E # decltype of an expression (C++0x) +Node *Db::parseDecltype() { + if (!consumeIf('D')) + return nullptr; + if (!consumeIf('t') && !consumeIf('T')) + return nullptr; + Node *E = parseExpr(); + if (E == nullptr) + return nullptr; + if (!consumeIf('E')) + return nullptr; + return make<EnclosingExpr>("decltype(", E, ")"); +} + +// <array-type> ::= A <positive dimension number> _ <element type> +// ::= A [<dimension expression>] _ <element type> +Node *Db::parseArrayType() { + if (!consumeIf('A')) + return nullptr; + + if (std::isdigit(look())) { + StringView Dimension = parseNumber(); + if (!consumeIf('_')) + return nullptr; + Node *Ty = parseType(); + if (Ty == nullptr) + return nullptr; + return make<ArrayType>(Ty, Dimension); + } + + if (!consumeIf('_')) { + Node *DimExpr = parseExpr(); + if (DimExpr == nullptr) + return nullptr; + if (!consumeIf('_')) + return nullptr; + Node *ElementType = parseType(); + if (ElementType == nullptr) + return nullptr; + return make<ArrayType>(ElementType, DimExpr); + } + + Node *Ty = parseType(); + if (Ty == nullptr) + return nullptr; + return make<ArrayType>(Ty); +} + +// <pointer-to-member-type> ::= M <class type> <member type> +Node *Db::parsePointerToMemberType() { + if (!consumeIf('M')) + return nullptr; + Node *ClassType = parseType(); + if (ClassType == nullptr) + return nullptr; + Node *MemberType = parseType(); + if (MemberType == nullptr) + return nullptr; + return make<PointerToMemberType>(ClassType, MemberType); +} + +// <class-enum-type> ::= <name> # non-dependent type name, dependent type name, or dependent typename-specifier +// ::= Ts <name> # dependent elaborated type specifier using 'struct' or 'class' +// ::= Tu <name> # dependent elaborated type specifier using 'union' +// ::= Te <name> # dependent elaborated type specifier using 'enum' +Node *Db::parseClassEnumType() { + StringView ElabSpef; + if (consumeIf("Ts")) + ElabSpef = "struct"; + else if (consumeIf("Tu")) + ElabSpef = "union"; + else if (consumeIf("Te")) + ElabSpef = "enum"; + + Node *Name = parseName(); + if (Name == nullptr) + return nullptr; + + if (!ElabSpef.empty()) + return make<ElaboratedTypeSpefType>(ElabSpef, Name); + + return Name; +} + +// <qualified-type> ::= <qualifiers> <type> +// <qualifiers> ::= <extended-qualifier>* <CV-qualifiers> +// <extended-qualifier> ::= U <source-name> [<template-args>] # vendor extended type qualifier +Node *Db::parseQualifiedType() { + if (consumeIf('U')) { + StringView Qual = parseBareSourceName(); + if (Qual.empty()) + return nullptr; + + // FIXME parse the optional <template-args> here! + + // extension ::= U <objc-name> <objc-type> # objc-type<identifier> + if (Qual.startsWith("objcproto")) { + StringView ProtoSourceName = Qual.dropFront(std::strlen("objcproto")); + StringView Proto; + { + SwapAndRestore<const char *> SaveFirst(First, ProtoSourceName.begin()), + SaveLast(Last, ProtoSourceName.end()); + Proto = parseBareSourceName(); + } + if (Proto.empty()) + return nullptr; + Node *Child = parseQualifiedType(); + if (Child == nullptr) + return nullptr; + return make<ObjCProtoName>(Child, Proto); + } + + Node *Child = parseQualifiedType(); + if (Child == nullptr) + return nullptr; + return make<VendorExtQualType>(Child, Qual); + } + + Qualifiers Quals = parseCVQualifiers(); + Node *Ty = parseType(); + if (Ty == nullptr) + return nullptr; + if (Quals != QualNone) + Ty = make<QualType>(Ty, Quals); + return Ty; +} + +// <type> ::= <builtin-type> +// ::= <qualified-type> +// ::= <function-type> +// ::= <class-enum-type> +// ::= <array-type> +// ::= <pointer-to-member-type> +// ::= <template-param> +// ::= <template-template-param> <template-args> +// ::= <decltype> +// ::= P <type> # pointer +// ::= R <type> # l-value reference +// ::= O <type> # r-value reference (C++11) +// ::= C <type> # complex pair (C99) +// ::= G <type> # imaginary (C99) +// ::= <substitution> # See Compression below +// extension ::= U <objc-name> <objc-type> # objc-type<identifier> +// extension ::= <vector-type> # <vector-type> starts with Dv +// +// <objc-name> ::= <k0 number> objcproto <k1 number> <identifier> # k0 = 9 + <number of digits in k1> + k1 +// <objc-type> ::= <source-name> # PU<11+>objcproto 11objc_object<source-name> 11objc_object -> id<source-name> +Node *Db::parseType() { + Node *Result = nullptr; + + switch (look()) { + // ::= <qualified-type> + case 'r': + case 'V': + case 'K': { + unsigned AfterQuals = 0; + if (look(AfterQuals) == 'r') ++AfterQuals; + if (look(AfterQuals) == 'V') ++AfterQuals; + if (look(AfterQuals) == 'K') ++AfterQuals; + + if (look(AfterQuals) == 'F' || + (look(AfterQuals) == 'D' && + (look(AfterQuals + 1) == 'o' || look(AfterQuals + 1) == 'O' || + look(AfterQuals + 1) == 'w' || look(AfterQuals + 1) == 'x'))) { + Result = parseFunctionType(); + break; + } + LLVM_FALLTHROUGH; + } + case 'U': { + Result = parseQualifiedType(); + break; + } + // <builtin-type> ::= v # void + case 'v': + ++First; + return make<NameType>("void"); + // ::= w # wchar_t + case 'w': + ++First; + return make<NameType>("wchar_t"); + // ::= b # bool + case 'b': + ++First; + return make<NameType>("bool"); + // ::= c # char + case 'c': + ++First; + return make<NameType>("char"); + // ::= a # signed char + case 'a': + ++First; + return make<NameType>("signed char"); + // ::= h # unsigned char + case 'h': + ++First; + return make<NameType>("unsigned char"); + // ::= s # short + case 's': + ++First; + return make<NameType>("short"); + // ::= t # unsigned short + case 't': + ++First; + return make<NameType>("unsigned short"); + // ::= i # int + case 'i': + ++First; + return make<NameType>("int"); + // ::= j # unsigned int + case 'j': + ++First; + return make<NameType>("unsigned int"); + // ::= l # long + case 'l': + ++First; + return make<NameType>("long"); + // ::= m # unsigned long + case 'm': + ++First; + return make<NameType>("unsigned long"); + // ::= x # long long, __int64 + case 'x': + ++First; + return make<NameType>("long long"); + // ::= y # unsigned long long, __int64 + case 'y': + ++First; + return make<NameType>("unsigned long long"); + // ::= n # __int128 + case 'n': + ++First; + return make<NameType>("__int128"); + // ::= o # unsigned __int128 + case 'o': + ++First; + return make<NameType>("unsigned __int128"); + // ::= f # float + case 'f': + ++First; + return make<NameType>("float"); + // ::= d # double + case 'd': + ++First; + return make<NameType>("double"); + // ::= e # long double, __float80 + case 'e': + ++First; + return make<NameType>("long double"); + // ::= g # __float128 + case 'g': + ++First; + return make<NameType>("__float128"); + // ::= z # ellipsis + case 'z': + ++First; + return make<NameType>("..."); + + // <builtin-type> ::= u <source-name> # vendor extended type + case 'u': { + ++First; + StringView Res = parseBareSourceName(); + if (Res.empty()) + return nullptr; + return make<NameType>(Res); + } + case 'D': + switch (look(1)) { + // ::= Dd # IEEE 754r decimal floating point (64 bits) + case 'd': + First += 2; + return make<NameType>("decimal64"); + // ::= De # IEEE 754r decimal floating point (128 bits) + case 'e': + First += 2; + return make<NameType>("decimal128"); + // ::= Df # IEEE 754r decimal floating point (32 bits) + case 'f': + First += 2; + return make<NameType>("decimal32"); + // ::= Dh # IEEE 754r half-precision floating point (16 bits) + case 'h': + First += 2; + return make<NameType>("decimal16"); + // ::= Di # char32_t + case 'i': + First += 2; + return make<NameType>("char32_t"); + // ::= Ds # char16_t + case 's': + First += 2; + return make<NameType>("char16_t"); + // ::= Da # auto (in dependent new-expressions) + case 'a': + First += 2; + return make<NameType>("auto"); + // ::= Dc # decltype(auto) + case 'c': + First += 2; + return make<NameType>("decltype(auto)"); + // ::= Dn # std::nullptr_t (i.e., decltype(nullptr)) + case 'n': + First += 2; + return make<NameType>("std::nullptr_t"); + + // ::= <decltype> + case 't': + case 'T': { + Result = parseDecltype(); + break; + } + // extension ::= <vector-type> # <vector-type> starts with Dv + case 'v': { + Result = parseVectorType(); + break; + } + // ::= Dp <type> # pack expansion (C++0x) + case 'p': { + First += 2; + Node *Child = parseType(); + if (!Child) + return nullptr; + Result = make<ParameterPackExpansion>(Child); + break; + } + // Exception specifier on a function type. + case 'o': + case 'O': + case 'w': + // Transaction safe function type. + case 'x': + Result = parseFunctionType(); + break; + } + break; + // ::= <function-type> + case 'F': { + Result = parseFunctionType(); + break; + } + // ::= <array-type> + case 'A': { + Result = parseArrayType(); + break; + } + // ::= <pointer-to-member-type> + case 'M': { + Result = parsePointerToMemberType(); + break; + } + // ::= <template-param> + case 'T': { + // This could be an elaborate type specifier on a <class-enum-type>. + if (look(1) == 's' || look(1) == 'u' || look(1) == 'e') { + Result = parseClassEnumType(); + break; + } + + Result = parseTemplateParam(); + if (Result == nullptr) + return nullptr; + + // Result could be either of: + // <type> ::= <template-param> + // <type> ::= <template-template-param> <template-args> + // + // <template-template-param> ::= <template-param> + // ::= <substitution> + // + // If this is followed by some <template-args>, and we're permitted to + // parse them, take the second production. + + if (TryToParseTemplateArgs && look() == 'I') { + Node *TA = parseTemplateArgs(); + if (TA == nullptr) + return nullptr; + Result = make<NameWithTemplateArgs>(Result, TA); + } + break; + } + // ::= P <type> # pointer + case 'P': { + ++First; + Node *Ptr = parseType(); + if (Ptr == nullptr) + return nullptr; + Result = make<PointerType>(Ptr); + break; + } + // ::= R <type> # l-value reference + case 'R': { + ++First; + Node *Ref = parseType(); + if (Ref == nullptr) + return nullptr; + Result = make<ReferenceType>(Ref, ReferenceKind::LValue); + break; + } + // ::= O <type> # r-value reference (C++11) + case 'O': { + ++First; + Node *Ref = parseType(); + if (Ref == nullptr) + return nullptr; + Result = make<ReferenceType>(Ref, ReferenceKind::RValue); + break; + } + // ::= C <type> # complex pair (C99) + case 'C': { + ++First; + Node *P = parseType(); + if (P == nullptr) + return nullptr; + Result = make<PostfixQualifiedType>(P, " complex"); + break; + } + // ::= G <type> # imaginary (C99) + case 'G': { + ++First; + Node *P = parseType(); + if (P == nullptr) + return P; + Result = make<PostfixQualifiedType>(P, " imaginary"); + break; + } + // ::= <substitution> # See Compression below + case 'S': { + if (look(1) && look(1) != 't') { + Node *Sub = parseSubstitution(); + if (Sub == nullptr) + return nullptr; + + // Sub could be either of: + // <type> ::= <substitution> + // <type> ::= <template-template-param> <template-args> + // + // <template-template-param> ::= <template-param> + // ::= <substitution> + // + // If this is followed by some <template-args>, and we're permitted to + // parse them, take the second production. + + if (TryToParseTemplateArgs && look() == 'I') { + Node *TA = parseTemplateArgs(); + if (TA == nullptr) + return nullptr; + Result = make<NameWithTemplateArgs>(Sub, TA); + break; + } + + // If all we parsed was a substitution, don't re-insert into the + // substitution table. + return Sub; + } + LLVM_FALLTHROUGH; + } + // ::= <class-enum-type> + default: { + Result = parseClassEnumType(); + break; + } + } + + // If we parsed a type, insert it into the substitution table. Note that all + // <builtin-type>s and <substitution>s have already bailed out, because they + // don't get substitutions. + if (Result != nullptr) + Subs.push_back(Result); + return Result; +} + +Node *Db::parsePrefixExpr(StringView Kind) { + Node *E = parseExpr(); + if (E == nullptr) + return nullptr; + return make<PrefixExpr>(Kind, E); +} + +Node *Db::parseBinaryExpr(StringView Kind) { + Node *LHS = parseExpr(); + if (LHS == nullptr) + return nullptr; + Node *RHS = parseExpr(); + if (RHS == nullptr) + return nullptr; + return make<BinaryExpr>(LHS, Kind, RHS); +} + +Node *Db::parseIntegerLiteral(StringView Lit) { + StringView Tmp = parseNumber(true); + if (!Tmp.empty() && consumeIf('E')) + return make<IntegerExpr>(Lit, Tmp); + return nullptr; +} + +// <CV-Qualifiers> ::= [r] [V] [K] +Qualifiers Db::parseCVQualifiers() { + Qualifiers CVR = QualNone; + if (consumeIf('r')) + addQualifiers(CVR, QualRestrict); + if (consumeIf('V')) + addQualifiers(CVR, QualVolatile); + if (consumeIf('K')) + addQualifiers(CVR, QualConst); + return CVR; +} + +// <function-param> ::= fp <top-level CV-Qualifiers> _ # L == 0, first parameter +// ::= fp <top-level CV-Qualifiers> <parameter-2 non-negative number> _ # L == 0, second and later parameters +// ::= fL <L-1 non-negative number> p <top-level CV-Qualifiers> _ # L > 0, first parameter +// ::= fL <L-1 non-negative number> p <top-level CV-Qualifiers> <parameter-2 non-negative number> _ # L > 0, second and later parameters +Node *Db::parseFunctionParam() { + if (consumeIf("fp")) { + parseCVQualifiers(); + StringView Num = parseNumber(); + if (!consumeIf('_')) + return nullptr; + return make<FunctionParam>(Num); + } + if (consumeIf("fL")) { + if (parseNumber().empty()) + return nullptr; + if (!consumeIf('p')) + return nullptr; + parseCVQualifiers(); + StringView Num = parseNumber(); + if (!consumeIf('_')) + return nullptr; + return make<FunctionParam>(Num); + } + return nullptr; +} + +// [gs] nw <expression>* _ <type> E # new (expr-list) type +// [gs] nw <expression>* _ <type> <initializer> # new (expr-list) type (init) +// [gs] na <expression>* _ <type> E # new[] (expr-list) type +// [gs] na <expression>* _ <type> <initializer> # new[] (expr-list) type (init) +// <initializer> ::= pi <expression>* E # parenthesized initialization +Node *Db::parseNewExpr() { + bool Global = consumeIf("gs"); + bool IsArray = look(1) == 'a'; + if (!consumeIf("nw") && !consumeIf("na")) + return nullptr; + size_t Exprs = Names.size(); + while (!consumeIf('_')) { + Node *Ex = parseExpr(); + if (Ex == nullptr) + return nullptr; + Names.push_back(Ex); + } + NodeArray ExprList = popTrailingNodeArray(Exprs); + Node *Ty = parseType(); + if (Ty == nullptr) + return Ty; + if (consumeIf("pi")) { + size_t InitsBegin = Names.size(); + while (!consumeIf('E')) { + Node *Init = parseExpr(); + if (Init == nullptr) + return Init; + Names.push_back(Init); + } + NodeArray Inits = popTrailingNodeArray(InitsBegin); + return make<NewExpr>(ExprList, Ty, Inits, Global, IsArray); + } else if (!consumeIf('E')) + return nullptr; + return make<NewExpr>(ExprList, Ty, NodeArray(), Global, IsArray); +} + +// cv <type> <expression> # conversion with one argument +// cv <type> _ <expression>* E # conversion with a different number of arguments +Node *Db::parseConversionExpr() { + if (!consumeIf("cv")) + return nullptr; + Node *Ty; + { + SwapAndRestore<bool> SaveTemp(TryToParseTemplateArgs, false); + Ty = parseType(); + } + + if (Ty == nullptr) + return nullptr; + + if (consumeIf('_')) { + size_t ExprsBegin = Names.size(); + while (!consumeIf('E')) { + Node *E = parseExpr(); + if (E == nullptr) + return E; + Names.push_back(E); + } + NodeArray Exprs = popTrailingNodeArray(ExprsBegin); + return make<ConversionExpr>(Ty, Exprs); + } + + Node *E[1] = {parseExpr()}; + if (E[0] == nullptr) + return nullptr; + return make<ConversionExpr>(Ty, makeNodeArray(E, E + 1)); +} + +// <expr-primary> ::= L <type> <value number> E # integer literal +// ::= L <type> <value float> E # floating literal +// ::= L <string type> E # string literal +// ::= L <nullptr type> E # nullptr literal (i.e., "LDnE") +// FIXME: ::= L <type> <real-part float> _ <imag-part float> E # complex floating point literal (C 2000) +// ::= L <mangled-name> E # external name +Node *Db::parseExprPrimary() { + if (!consumeIf('L')) + return nullptr; + switch (look()) { + case 'w': + ++First; + return parseIntegerLiteral("wchar_t"); + case 'b': + if (consumeIf("b0E")) + return make<BoolExpr>(0); + if (consumeIf("b1E")) + return make<BoolExpr>(1); + return nullptr; + case 'c': + ++First; + return parseIntegerLiteral("char"); + case 'a': + ++First; + return parseIntegerLiteral("signed char"); + case 'h': + ++First; + return parseIntegerLiteral("unsigned char"); + case 's': + ++First; + return parseIntegerLiteral("short"); + case 't': + ++First; + return parseIntegerLiteral("unsigned short"); + case 'i': + ++First; + return parseIntegerLiteral(""); + case 'j': + ++First; + return parseIntegerLiteral("u"); + case 'l': + ++First; + return parseIntegerLiteral("l"); + case 'm': + ++First; + return parseIntegerLiteral("ul"); + case 'x': + ++First; + return parseIntegerLiteral("ll"); + case 'y': + ++First; + return parseIntegerLiteral("ull"); + case 'n': + ++First; + return parseIntegerLiteral("__int128"); + case 'o': + ++First; + return parseIntegerLiteral("unsigned __int128"); + case 'f': + ++First; + return parseFloatingLiteral<float>(); + case 'd': + ++First; + return parseFloatingLiteral<double>(); + case 'e': + ++First; + return parseFloatingLiteral<long double>(); + case '_': + if (consumeIf("_Z")) { + Node *R = parseEncoding(); + if (R != nullptr && consumeIf('E')) + return R; + } + return nullptr; + case 'T': + // Invalid mangled name per + // http://sourcerytools.com/pipermail/cxx-abi-dev/2011-August/002422.html + return nullptr; + default: { + // might be named type + Node *T = parseType(); + if (T == nullptr) + return nullptr; + StringView N = parseNumber(); + if (!N.empty()) { + if (!consumeIf('E')) + return nullptr; + return make<IntegerCastExpr>(T, N); + } + if (consumeIf('E')) + return T; + return nullptr; + } + } +} + +// <braced-expression> ::= <expression> +// ::= di <field source-name> <braced-expression> # .name = expr +// ::= dx <index expression> <braced-expression> # [expr] = expr +// ::= dX <range begin expression> <range end expression> <braced-expression> +Node *Db::parseBracedExpr() { + if (look() == 'd') { + switch (look(1)) { + case 'i': { + First += 2; + Node *Field = parseSourceName(/*NameState=*/nullptr); + if (Field == nullptr) + return nullptr; + Node *Init = parseBracedExpr(); + if (Init == nullptr) + return nullptr; + return make<BracedExpr>(Field, Init, /*isArray=*/false); + } + case 'x': { + First += 2; + Node *Index = parseExpr(); + if (Index == nullptr) + return nullptr; + Node *Init = parseBracedExpr(); + if (Init == nullptr) + return nullptr; + return make<BracedExpr>(Index, Init, /*isArray=*/true); + } + case 'X': { + First += 2; + Node *RangeBegin = parseExpr(); + if (RangeBegin == nullptr) + return nullptr; + Node *RangeEnd = parseExpr(); + if (RangeEnd == nullptr) + return nullptr; + Node *Init = parseBracedExpr(); + if (Init == nullptr) + return nullptr; + return make<BracedRangeExpr>(RangeBegin, RangeEnd, Init); + } + } + } + return parseExpr(); +} + +// (not yet in the spec) +// <fold-expr> ::= fL <binary-operator-name> <expression> <expression> +// ::= fR <binary-operator-name> <expression> <expression> +// ::= fl <binary-operator-name> <expression> +// ::= fr <binary-operator-name> <expression> +Node *Db::parseFoldExpr() { + if (!consumeIf('f')) + return nullptr; + + char FoldKind = look(); + bool IsLeftFold, HasInitializer; + HasInitializer = FoldKind == 'L' || FoldKind == 'R'; + if (FoldKind == 'l' || FoldKind == 'L') + IsLeftFold = true; + else if (FoldKind == 'r' || FoldKind == 'R') + IsLeftFold = false; + else + return nullptr; + ++First; + + // FIXME: This map is duplicated in parseOperatorName and parseExpr. + StringView OperatorName; + if (consumeIf("aa")) OperatorName = "&&"; + else if (consumeIf("an")) OperatorName = "&"; + else if (consumeIf("aN")) OperatorName = "&="; + else if (consumeIf("aS")) OperatorName = "="; + else if (consumeIf("cm")) OperatorName = ","; + else if (consumeIf("ds")) OperatorName = ".*"; + else if (consumeIf("dv")) OperatorName = "/"; + else if (consumeIf("dV")) OperatorName = "/="; + else if (consumeIf("eo")) OperatorName = "^"; + else if (consumeIf("eO")) OperatorName = "^="; + else if (consumeIf("eq")) OperatorName = "=="; + else if (consumeIf("ge")) OperatorName = ">="; + else if (consumeIf("gt")) OperatorName = ">"; + else if (consumeIf("le")) OperatorName = "<="; + else if (consumeIf("ls")) OperatorName = "<<"; + else if (consumeIf("lS")) OperatorName = "<<="; + else if (consumeIf("lt")) OperatorName = "<"; + else if (consumeIf("mi")) OperatorName = "-"; + else if (consumeIf("mI")) OperatorName = "-="; + else if (consumeIf("ml")) OperatorName = "*"; + else if (consumeIf("mL")) OperatorName = "*="; + else if (consumeIf("ne")) OperatorName = "!="; + else if (consumeIf("oo")) OperatorName = "||"; + else if (consumeIf("or")) OperatorName = "|"; + else if (consumeIf("oR")) OperatorName = "|="; + else if (consumeIf("pl")) OperatorName = "+"; + else if (consumeIf("pL")) OperatorName = "+="; + else if (consumeIf("rm")) OperatorName = "%"; + else if (consumeIf("rM")) OperatorName = "%="; + else if (consumeIf("rs")) OperatorName = ">>"; + else if (consumeIf("rS")) OperatorName = ">>="; + else return nullptr; + + Node *Pack = parseExpr(), *Init = nullptr; + if (Pack == nullptr) + return nullptr; + if (HasInitializer) { + Init = parseExpr(); + if (Init == nullptr) + return nullptr; + } + + if (IsLeftFold && Init) + std::swap(Pack, Init); + + return make<FoldExpr>(IsLeftFold, OperatorName, Pack, Init); +} + +// <expression> ::= <unary operator-name> <expression> +// ::= <binary operator-name> <expression> <expression> +// ::= <ternary operator-name> <expression> <expression> <expression> +// ::= cl <expression>+ E # call +// ::= cv <type> <expression> # conversion with one argument +// ::= cv <type> _ <expression>* E # conversion with a different number of arguments +// ::= [gs] nw <expression>* _ <type> E # new (expr-list) type +// ::= [gs] nw <expression>* _ <type> <initializer> # new (expr-list) type (init) +// ::= [gs] na <expression>* _ <type> E # new[] (expr-list) type +// ::= [gs] na <expression>* _ <type> <initializer> # new[] (expr-list) type (init) +// ::= [gs] dl <expression> # delete expression +// ::= [gs] da <expression> # delete[] expression +// ::= pp_ <expression> # prefix ++ +// ::= mm_ <expression> # prefix -- +// ::= ti <type> # typeid (type) +// ::= te <expression> # typeid (expression) +// ::= dc <type> <expression> # dynamic_cast<type> (expression) +// ::= sc <type> <expression> # static_cast<type> (expression) +// ::= cc <type> <expression> # const_cast<type> (expression) +// ::= rc <type> <expression> # reinterpret_cast<type> (expression) +// ::= st <type> # sizeof (a type) +// ::= sz <expression> # sizeof (an expression) +// ::= at <type> # alignof (a type) +// ::= az <expression> # alignof (an expression) +// ::= nx <expression> # noexcept (expression) +// ::= <template-param> +// ::= <function-param> +// ::= dt <expression> <unresolved-name> # expr.name +// ::= pt <expression> <unresolved-name> # expr->name +// ::= ds <expression> <expression> # expr.*expr +// ::= sZ <template-param> # size of a parameter pack +// ::= sZ <function-param> # size of a function parameter pack +// ::= sP <template-arg>* E # sizeof...(T), size of a captured template parameter pack from an alias template +// ::= sp <expression> # pack expansion +// ::= tw <expression> # throw expression +// ::= tr # throw with no operand (rethrow) +// ::= <unresolved-name> # f(p), N::f(p), ::f(p), +// # freestanding dependent name (e.g., T::x), +// # objectless nonstatic member reference +// ::= fL <binary-operator-name> <expression> <expression> +// ::= fR <binary-operator-name> <expression> <expression> +// ::= fl <binary-operator-name> <expression> +// ::= fr <binary-operator-name> <expression> +// ::= <expr-primary> +Node *Db::parseExpr() { + bool Global = consumeIf("gs"); + if (numLeft() < 2) + return nullptr; + + switch (*First) { + case 'L': + return parseExprPrimary(); + case 'T': + return parseTemplateParam(); + case 'f': { + // Disambiguate a fold expression from a <function-param>. + if (look(1) == 'p' || (look(1) == 'L' && std::isdigit(look(2)))) + return parseFunctionParam(); + return parseFoldExpr(); + } + case 'a': + switch (First[1]) { + case 'a': + First += 2; + return parseBinaryExpr("&&"); + case 'd': + First += 2; + return parsePrefixExpr("&"); + case 'n': + First += 2; + return parseBinaryExpr("&"); + case 'N': + First += 2; + return parseBinaryExpr("&="); + case 'S': + First += 2; + return parseBinaryExpr("="); + case 't': { + First += 2; + Node *Ty = parseType(); + if (Ty == nullptr) + return nullptr; + return make<EnclosingExpr>("alignof (", Ty, ")"); + } + case 'z': { + First += 2; + Node *Ty = parseExpr(); + if (Ty == nullptr) + return nullptr; + return make<EnclosingExpr>("alignof (", Ty, ")"); + } + } + return nullptr; + case 'c': + switch (First[1]) { + // cc <type> <expression> # const_cast<type>(expression) + case 'c': { + First += 2; + Node *Ty = parseType(); + if (Ty == nullptr) + return Ty; + Node *Ex = parseExpr(); + if (Ex == nullptr) + return Ex; + return make<CastExpr>("const_cast", Ty, Ex); + } + // cl <expression>+ E # call + case 'l': { + First += 2; + Node *Callee = parseExpr(); + if (Callee == nullptr) + return Callee; + size_t ExprsBegin = Names.size(); + while (!consumeIf('E')) { + Node *E = parseExpr(); + if (E == nullptr) + return E; + Names.push_back(E); + } + return make<CallExpr>(Callee, popTrailingNodeArray(ExprsBegin)); + } + case 'm': + First += 2; + return parseBinaryExpr(","); + case 'o': + First += 2; + return parsePrefixExpr("~"); + case 'v': + return parseConversionExpr(); + } + return nullptr; + case 'd': + switch (First[1]) { + case 'a': { + First += 2; + Node *Ex = parseExpr(); + if (Ex == nullptr) + return Ex; + return make<DeleteExpr>(Ex, Global, /*is_array=*/true); + } + case 'c': { + First += 2; + Node *T = parseType(); + if (T == nullptr) + return T; + Node *Ex = parseExpr(); + if (Ex == nullptr) + return Ex; + return make<CastExpr>("dynamic_cast", T, Ex); + } + case 'e': + First += 2; + return parsePrefixExpr("*"); + case 'l': { + First += 2; + Node *E = parseExpr(); + if (E == nullptr) + return E; + return make<DeleteExpr>(E, Global, /*is_array=*/false); + } + case 'n': + return parseUnresolvedName(); + case 's': { + First += 2; + Node *LHS = parseExpr(); + if (LHS == nullptr) + return nullptr; + Node *RHS = parseExpr(); + if (RHS == nullptr) + return nullptr; + return make<MemberExpr>(LHS, ".*", RHS); + } + case 't': { + First += 2; + Node *LHS = parseExpr(); + if (LHS == nullptr) + return LHS; + Node *RHS = parseExpr(); + if (RHS == nullptr) + return nullptr; + return make<MemberExpr>(LHS, ".", RHS); + } + case 'v': + First += 2; + return parseBinaryExpr("/"); + case 'V': + First += 2; + return parseBinaryExpr("/="); + } + return nullptr; + case 'e': + switch (First[1]) { + case 'o': + First += 2; + return parseBinaryExpr("^"); + case 'O': + First += 2; + return parseBinaryExpr("^="); + case 'q': + First += 2; + return parseBinaryExpr("=="); + } + return nullptr; + case 'g': + switch (First[1]) { + case 'e': + First += 2; + return parseBinaryExpr(">="); + case 't': + First += 2; + return parseBinaryExpr(">"); + } + return nullptr; + case 'i': + switch (First[1]) { + case 'x': { + First += 2; + Node *Base = parseExpr(); + if (Base == nullptr) + return nullptr; + Node *Index = parseExpr(); + if (Index == nullptr) + return Index; + return make<ArraySubscriptExpr>(Base, Index); + } + case 'l': { + First += 2; + size_t InitsBegin = Names.size(); + while (!consumeIf('E')) { + Node *E = parseBracedExpr(); + if (E == nullptr) + return nullptr; + Names.push_back(E); + } + return make<InitListExpr>(nullptr, popTrailingNodeArray(InitsBegin)); + } + } + return nullptr; + case 'l': + switch (First[1]) { + case 'e': + First += 2; + return parseBinaryExpr("<="); + case 's': + First += 2; + return parseBinaryExpr("<<"); + case 'S': + First += 2; + return parseBinaryExpr("<<="); + case 't': + First += 2; + return parseBinaryExpr("<"); + } + return nullptr; + case 'm': + switch (First[1]) { + case 'i': + First += 2; + return parseBinaryExpr("-"); + case 'I': + First += 2; + return parseBinaryExpr("-="); + case 'l': + First += 2; + return parseBinaryExpr("*"); + case 'L': + First += 2; + return parseBinaryExpr("*="); + case 'm': + First += 2; + if (consumeIf('_')) + return parsePrefixExpr("--"); + Node *Ex = parseExpr(); + if (Ex == nullptr) + return nullptr; + return make<PostfixExpr>(Ex, "--"); + } + return nullptr; + case 'n': + switch (First[1]) { + case 'a': + case 'w': + return parseNewExpr(); + case 'e': + First += 2; + return parseBinaryExpr("!="); + case 'g': + First += 2; + return parsePrefixExpr("-"); + case 't': + First += 2; + return parsePrefixExpr("!"); + case 'x': + First += 2; + Node *Ex = parseExpr(); + if (Ex == nullptr) + return Ex; + return make<EnclosingExpr>("noexcept (", Ex, ")"); + } + return nullptr; + case 'o': + switch (First[1]) { + case 'n': + return parseUnresolvedName(); + case 'o': + First += 2; + return parseBinaryExpr("||"); + case 'r': + First += 2; + return parseBinaryExpr("|"); + case 'R': + First += 2; + return parseBinaryExpr("|="); + } + return nullptr; + case 'p': + switch (First[1]) { + case 'm': + First += 2; + return parseBinaryExpr("->*"); + case 'l': + First += 2; + return parseBinaryExpr("+"); + case 'L': + First += 2; + return parseBinaryExpr("+="); + case 'p': { + First += 2; + if (consumeIf('_')) + return parsePrefixExpr("++"); + Node *Ex = parseExpr(); + if (Ex == nullptr) + return Ex; + return make<PostfixExpr>(Ex, "++"); + } + case 's': + First += 2; + return parsePrefixExpr("+"); + case 't': { + First += 2; + Node *L = parseExpr(); + if (L == nullptr) + return nullptr; + Node *R = parseExpr(); + if (R == nullptr) + return nullptr; + return make<MemberExpr>(L, "->", R); + } + } + return nullptr; + case 'q': + if (First[1] == 'u') { + First += 2; + Node *Cond = parseExpr(); + if (Cond == nullptr) + return nullptr; + Node *LHS = parseExpr(); + if (LHS == nullptr) + return nullptr; + Node *RHS = parseExpr(); + if (RHS == nullptr) + return nullptr; + return make<ConditionalExpr>(Cond, LHS, RHS); + } + return nullptr; + case 'r': + switch (First[1]) { + case 'c': { + First += 2; + Node *T = parseType(); + if (T == nullptr) + return T; + Node *Ex = parseExpr(); + if (Ex == nullptr) + return Ex; + return make<CastExpr>("reinterpret_cast", T, Ex); + } + case 'm': + First += 2; + return parseBinaryExpr("%"); + case 'M': + First += 2; + return parseBinaryExpr("%="); + case 's': + First += 2; + return parseBinaryExpr(">>"); + case 'S': + First += 2; + return parseBinaryExpr(">>="); + } + return nullptr; + case 's': + switch (First[1]) { + case 'c': { + First += 2; + Node *T = parseType(); + if (T == nullptr) + return T; + Node *Ex = parseExpr(); + if (Ex == nullptr) + return Ex; + return make<CastExpr>("static_cast", T, Ex); + } + case 'p': { + First += 2; + Node *Child = parseExpr(); + if (Child == nullptr) + return nullptr; + return make<ParameterPackExpansion>(Child); + } + case 'r': + return parseUnresolvedName(); + case 't': { + First += 2; + Node *Ty = parseType(); + if (Ty == nullptr) + return Ty; + return make<EnclosingExpr>("sizeof (", Ty, ")"); + } + case 'z': { + First += 2; + Node *Ex = parseExpr(); + if (Ex == nullptr) + return Ex; + return make<EnclosingExpr>("sizeof (", Ex, ")"); + } + case 'Z': + First += 2; + if (look() == 'T') { + Node *R = parseTemplateParam(); + if (R == nullptr) + return nullptr; + return make<SizeofParamPackExpr>(R); + } else if (look() == 'f') { + Node *FP = parseFunctionParam(); + if (FP == nullptr) + return nullptr; + return make<EnclosingExpr>("sizeof... (", FP, ")"); + } + return nullptr; + case 'P': { + First += 2; + size_t ArgsBegin = Names.size(); + while (!consumeIf('E')) { + Node *Arg = parseTemplateArg(); + if (Arg == nullptr) + return nullptr; + Names.push_back(Arg); + } + return make<EnclosingExpr>( + "sizeof... (", make<NodeArrayNode>(popTrailingNodeArray(ArgsBegin)), + ")"); + } + } + return nullptr; + case 't': + switch (First[1]) { + case 'e': { + First += 2; + Node *Ex = parseExpr(); + if (Ex == nullptr) + return Ex; + return make<EnclosingExpr>("typeid (", Ex, ")"); + } + case 'i': { + First += 2; + Node *Ty = parseType(); + if (Ty == nullptr) + return Ty; + return make<EnclosingExpr>("typeid (", Ty, ")"); + } + case 'l': { + First += 2; + Node *Ty = parseType(); + if (Ty == nullptr) + return nullptr; + size_t InitsBegin = Names.size(); + while (!consumeIf('E')) { + Node *E = parseBracedExpr(); + if (E == nullptr) + return nullptr; + Names.push_back(E); + } + return make<InitListExpr>(Ty, popTrailingNodeArray(InitsBegin)); + } + case 'r': + First += 2; + return make<NameType>("throw"); + case 'w': { + First += 2; + Node *Ex = parseExpr(); + if (Ex == nullptr) + return nullptr; + return make<ThrowExpr>(Ex); + } + } + return nullptr; + case '1': + case '2': + case '3': + case '4': + case '5': + case '6': + case '7': + case '8': + case '9': + return parseUnresolvedName(); + } + return nullptr; +} + +// <call-offset> ::= h <nv-offset> _ +// ::= v <v-offset> _ +// +// <nv-offset> ::= <offset number> +// # non-virtual base override +// +// <v-offset> ::= <offset number> _ <virtual offset number> +// # virtual base override, with vcall offset +bool Db::parseCallOffset() { + // Just scan through the call offset, we never add this information into the + // output. + if (consumeIf('h')) + return parseNumber(true).empty() || !consumeIf('_'); + if (consumeIf('v')) + return parseNumber(true).empty() || !consumeIf('_') || + parseNumber(true).empty() || !consumeIf('_'); + return true; +} + +// <special-name> ::= TV <type> # virtual table +// ::= TT <type> # VTT structure (construction vtable index) +// ::= TI <type> # typeinfo structure +// ::= TS <type> # typeinfo name (null-terminated byte string) +// ::= Tc <call-offset> <call-offset> <base encoding> +// # base is the nominal target function of thunk +// # first call-offset is 'this' adjustment +// # second call-offset is result adjustment +// ::= T <call-offset> <base encoding> +// # base is the nominal target function of thunk +// ::= GV <object name> # Guard variable for one-time initialization +// # No <type> +// ::= TW <object name> # Thread-local wrapper +// ::= TH <object name> # Thread-local initialization +// ::= GR <object name> _ # First temporary +// ::= GR <object name> <seq-id> _ # Subsequent temporaries +// extension ::= TC <first type> <number> _ <second type> # construction vtable for second-in-first +// extension ::= GR <object name> # reference temporary for object +Node *Db::parseSpecialName() { + switch (look()) { + case 'T': + switch (look(1)) { + // TV <type> # virtual table + case 'V': { + First += 2; + Node *Ty = parseType(); + if (Ty == nullptr) + return nullptr; + return make<SpecialName>("vtable for ", Ty); + } + // TT <type> # VTT structure (construction vtable index) + case 'T': { + First += 2; + Node *Ty = parseType(); + if (Ty == nullptr) + return nullptr; + return make<SpecialName>("VTT for ", Ty); + } + // TI <type> # typeinfo structure + case 'I': { + First += 2; + Node *Ty = parseType(); + if (Ty == nullptr) + return nullptr; + return make<SpecialName>("typeinfo for ", Ty); + } + // TS <type> # typeinfo name (null-terminated byte string) + case 'S': { + First += 2; + Node *Ty = parseType(); + if (Ty == nullptr) + return nullptr; + return make<SpecialName>("typeinfo name for ", Ty); + } + // Tc <call-offset> <call-offset> <base encoding> + case 'c': { + First += 2; + if (parseCallOffset() || parseCallOffset()) + return nullptr; + Node *Encoding = parseEncoding(); + if (Encoding == nullptr) + return nullptr; + return make<SpecialName>("covariant return thunk to ", Encoding); + } + // extension ::= TC <first type> <number> _ <second type> + // # construction vtable for second-in-first + case 'C': { + First += 2; + Node *FirstType = parseType(); + if (FirstType == nullptr) + return nullptr; + if (parseNumber(true).empty() || !consumeIf('_')) + return nullptr; + Node *SecondType = parseType(); + if (SecondType == nullptr) + return nullptr; + return make<CtorVtableSpecialName>(SecondType, FirstType); + } + // TW <object name> # Thread-local wrapper + case 'W': { + First += 2; + Node *Name = parseName(); + if (Name == nullptr) + return nullptr; + return make<SpecialName>("thread-local wrapper routine for ", Name); + } + // TH <object name> # Thread-local initialization + case 'H': { + First += 2; + Node *Name = parseName(); + if (Name == nullptr) + return nullptr; + return make<SpecialName>("thread-local initialization routine for ", Name); + } + // T <call-offset> <base encoding> + default: { + ++First; + bool IsVirt = look() == 'v'; + if (parseCallOffset()) + return nullptr; + Node *BaseEncoding = parseEncoding(); + if (BaseEncoding == nullptr) + return nullptr; + if (IsVirt) + return make<SpecialName>("virtual thunk to ", BaseEncoding); + else + return make<SpecialName>("non-virtual thunk to ", BaseEncoding); + } + } + case 'G': + switch (look(1)) { + // GV <object name> # Guard variable for one-time initialization + case 'V': { + First += 2; + Node *Name = parseName(); + if (Name == nullptr) + return nullptr; + return make<SpecialName>("guard variable for ", Name); + } + // GR <object name> # reference temporary for object + // GR <object name> _ # First temporary + // GR <object name> <seq-id> _ # Subsequent temporaries + case 'R': { + First += 2; + Node *Name = parseName(); + if (Name == nullptr) + return nullptr; + size_t Count; + bool ParsedSeqId = !parseSeqId(&Count); + if (!consumeIf('_') && ParsedSeqId) + return nullptr; + return make<SpecialName>("reference temporary for ", Name); + } + } + } + return nullptr; +} + +// <encoding> ::= <function name> <bare-function-type> +// ::= <data name> +// ::= <special-name> +Node *Db::parseEncoding() { + if (look() == 'G' || look() == 'T') + return parseSpecialName(); + + auto IsEndOfEncoding = [&] { + // The set of chars that can potentially follow an <encoding> (none of which + // can start a <type>). Enumerating these allows us to avoid speculative + // parsing. + return numLeft() == 0 || look() == 'E' || look() == '.' || look() == '_'; + }; + + NameState NameInfo(this); + Node *Name = parseName(&NameInfo); + if (Name == nullptr) + return nullptr; + + if (resolveForwardTemplateRefs(NameInfo)) + return nullptr; + + if (IsEndOfEncoding()) + return Name; + + Node *Attrs = nullptr; + if (consumeIf("Ua9enable_ifI")) { + size_t BeforeArgs = Names.size(); + while (!consumeIf('E')) { + Node *Arg = parseTemplateArg(); + if (Arg == nullptr) + return nullptr; + Names.push_back(Arg); + } + Attrs = make<EnableIfAttr>(popTrailingNodeArray(BeforeArgs)); + } + + Node *ReturnType = nullptr; + if (!NameInfo.CtorDtorConversion && NameInfo.EndsWithTemplateArgs) { + ReturnType = parseType(); + if (ReturnType == nullptr) + return nullptr; + } + + if (consumeIf('v')) + return make<FunctionEncoding>(ReturnType, Name, NodeArray(), + Attrs, NameInfo.CVQualifiers, + NameInfo.ReferenceQualifier); + + size_t ParamsBegin = Names.size(); + do { + Node *Ty = parseType(); + if (Ty == nullptr) + return nullptr; + Names.push_back(Ty); + } while (!IsEndOfEncoding()); + + return make<FunctionEncoding>(ReturnType, Name, + popTrailingNodeArray(ParamsBegin), + Attrs, NameInfo.CVQualifiers, + NameInfo.ReferenceQualifier); +} + +template <class Float> +struct FloatData; + +template <> +struct FloatData<float> +{ + static const size_t mangled_size = 8; + static const size_t max_demangled_size = 24; + static constexpr const char* spec = "%af"; +}; + +constexpr const char* FloatData<float>::spec; + +template <> +struct FloatData<double> +{ + static const size_t mangled_size = 16; + static const size_t max_demangled_size = 32; + static constexpr const char* spec = "%a"; +}; + +constexpr const char* FloatData<double>::spec; + +template <> +struct FloatData<long double> +{ +#if defined(__mips__) && defined(__mips_n64) || defined(__aarch64__) || \ + defined(__wasm__) + static const size_t mangled_size = 32; +#elif defined(__arm__) || defined(__mips__) || defined(__hexagon__) + static const size_t mangled_size = 16; +#else + static const size_t mangled_size = 20; // May need to be adjusted to 16 or 24 on other platforms +#endif + static const size_t max_demangled_size = 40; + static constexpr const char *spec = "%LaL"; +}; + +constexpr const char *FloatData<long double>::spec; + +template <class Float> Node *Db::parseFloatingLiteral() { + const size_t N = FloatData<Float>::mangled_size; + if (numLeft() <= N) + return nullptr; + StringView Data(First, First + N); + for (char C : Data) + if (!std::isxdigit(C)) + return nullptr; + First += N; + if (!consumeIf('E')) + return nullptr; + return make<FloatExpr<Float>>(Data); +} + +// <seq-id> ::= <0-9A-Z>+ +bool Db::parseSeqId(size_t *Out) { + if (!(look() >= '0' && look() <= '9') && + !(look() >= 'A' && look() <= 'Z')) + return true; + + size_t Id = 0; + while (true) { + if (look() >= '0' && look() <= '9') { + Id *= 36; + Id += static_cast<size_t>(look() - '0'); + } else if (look() >= 'A' && look() <= 'Z') { + Id *= 36; + Id += static_cast<size_t>(look() - 'A') + 10; + } else { + *Out = Id; + return false; + } + ++First; + } +} + +// <substitution> ::= S <seq-id> _ +// ::= S_ +// <substitution> ::= Sa # ::std::allocator +// <substitution> ::= Sb # ::std::basic_string +// <substitution> ::= Ss # ::std::basic_string < char, +// ::std::char_traits<char>, +// ::std::allocator<char> > +// <substitution> ::= Si # ::std::basic_istream<char, std::char_traits<char> > +// <substitution> ::= So # ::std::basic_ostream<char, std::char_traits<char> > +// <substitution> ::= Sd # ::std::basic_iostream<char, std::char_traits<char> > +Node *Db::parseSubstitution() { + if (!consumeIf('S')) + return nullptr; + + if (std::islower(look())) { + Node *SpecialSub; + switch (look()) { + case 'a': + ++First; + SpecialSub = make<SpecialSubstitution>(SpecialSubKind::allocator); + break; + case 'b': + ++First; + SpecialSub = make<SpecialSubstitution>(SpecialSubKind::basic_string); + break; + case 's': + ++First; + SpecialSub = make<SpecialSubstitution>(SpecialSubKind::string); + break; + case 'i': + ++First; + SpecialSub = make<SpecialSubstitution>(SpecialSubKind::istream); + break; + case 'o': + ++First; + SpecialSub = make<SpecialSubstitution>(SpecialSubKind::ostream); + break; + case 'd': + ++First; + SpecialSub = make<SpecialSubstitution>(SpecialSubKind::iostream); + break; + default: + return nullptr; + } + // Itanium C++ ABI 5.1.2: If a name that would use a built-in <substitution> + // has ABI tags, the tags are appended to the substitution; the result is a + // substitutable component. + Node *WithTags = parseAbiTags(SpecialSub); + if (WithTags != SpecialSub) { + Subs.push_back(WithTags); + SpecialSub = WithTags; + } + return SpecialSub; + } + + // ::= S_ + if (consumeIf('_')) { + if (Subs.empty()) + return nullptr; + return Subs[0]; + } + + // ::= S <seq-id> _ + size_t Index = 0; + if (parseSeqId(&Index)) + return nullptr; + ++Index; + if (!consumeIf('_') || Index >= Subs.size()) + return nullptr; + return Subs[Index]; +} + +// <template-param> ::= T_ # first template parameter +// ::= T <parameter-2 non-negative number> _ +Node *Db::parseTemplateParam() { + if (!consumeIf('T')) + return nullptr; + + size_t Index = 0; + if (!consumeIf('_')) { + if (parsePositiveInteger(&Index)) + return nullptr; + ++Index; + if (!consumeIf('_')) + return nullptr; + } + + // Itanium ABI 5.1.8: In a generic lambda, uses of auto in the parameter list + // are mangled as the corresponding artificial template type parameter. + if (ParsingLambdaParams) + return make<NameType>("auto"); + + // If we're in a context where this <template-param> refers to a + // <template-arg> further ahead in the mangled name (currently just conversion + // operator types), then we should only look it up in the right context. + if (PermitForwardTemplateReferences) { + ForwardTemplateRefs.push_back(make<ForwardTemplateReference>(Index)); + return ForwardTemplateRefs.back(); + } + + if (Index >= TemplateParams.size()) + return nullptr; + return TemplateParams[Index]; +} + +// <template-arg> ::= <type> # type or template +// ::= X <expression> E # expression +// ::= <expr-primary> # simple expressions +// ::= J <template-arg>* E # argument pack +// ::= LZ <encoding> E # extension +Node *Db::parseTemplateArg() { + switch (look()) { + case 'X': { + ++First; + Node *Arg = parseExpr(); + if (Arg == nullptr || !consumeIf('E')) + return nullptr; + return Arg; + } + case 'J': { + ++First; + size_t ArgsBegin = Names.size(); + while (!consumeIf('E')) { + Node *Arg = parseTemplateArg(); + if (Arg == nullptr) + return nullptr; + Names.push_back(Arg); + } + NodeArray Args = popTrailingNodeArray(ArgsBegin); + return make<TemplateArgumentPack>(Args); + } + case 'L': { + // ::= LZ <encoding> E # extension + if (look(1) == 'Z') { + First += 2; + Node *Arg = parseEncoding(); + if (Arg == nullptr || !consumeIf('E')) + return nullptr; + return Arg; + } + // ::= <expr-primary> # simple expressions + return parseExprPrimary(); + } + default: + return parseType(); + } +} + +// <template-args> ::= I <template-arg>* E +// extension, the abi says <template-arg>+ +Node *Db::parseTemplateArgs(bool TagTemplates) { + if (!consumeIf('I')) + return nullptr; + + // <template-params> refer to the innermost <template-args>. Clear out any + // outer args that we may have inserted into TemplateParams. + if (TagTemplates) + TemplateParams.clear(); + + size_t ArgsBegin = Names.size(); + while (!consumeIf('E')) { + if (TagTemplates) { + auto OldParams = std::move(TemplateParams); + Node *Arg = parseTemplateArg(); + TemplateParams = std::move(OldParams); + if (Arg == nullptr) + return nullptr; + Names.push_back(Arg); + Node *TableEntry = Arg; + if (Arg->getKind() == Node::KTemplateArgumentPack) { + TableEntry = make<ParameterPack>( + static_cast<TemplateArgumentPack*>(TableEntry)->getElements()); + } + TemplateParams.push_back(TableEntry); + } else { + Node *Arg = parseTemplateArg(); + if (Arg == nullptr) + return nullptr; + Names.push_back(Arg); + } + } + return make<TemplateArgs>(popTrailingNodeArray(ArgsBegin)); +} + +// <discriminator> := _ <non-negative number> # when number < 10 +// := __ <non-negative number> _ # when number >= 10 +// extension := decimal-digit+ # at the end of string + +const char* +parse_discriminator(const char* first, const char* last) +{ + // parse but ignore discriminator + if (first != last) + { + if (*first == '_') + { + const char* t1 = first+1; + if (t1 != last) + { + if (std::isdigit(*t1)) + first = t1+1; + else if (*t1 == '_') + { + for (++t1; t1 != last && std::isdigit(*t1); ++t1) + ; + if (t1 != last && *t1 == '_') + first = t1 + 1; + } + } + } + else if (std::isdigit(*first)) + { + const char* t1 = first+1; + for (; t1 != last && std::isdigit(*t1); ++t1) + ; + if (t1 == last) + first = last; + } + } + return first; +} + +// <mangled-name> ::= _Z <encoding> +// ::= <type> +// extension ::= ___Z <encoding> _block_invoke +// extension ::= ___Z <encoding> _block_invoke<decimal-digit>+ +// extension ::= ___Z <encoding> _block_invoke_<decimal-digit>+ +Node *Db::parse() { + if (consumeIf("_Z")) { + Node *Encoding = parseEncoding(); + if (Encoding == nullptr) + return nullptr; + if (look() == '.') { + Encoding = make<DotSuffix>(Encoding, StringView(First, Last)); + First = Last; + } + if (numLeft() != 0) + return nullptr; + return Encoding; + } + + if (consumeIf("___Z")) { + Node *Encoding = parseEncoding(); + if (Encoding == nullptr || !consumeIf("_block_invoke")) + return nullptr; + bool RequireNumber = consumeIf('_'); + if (parseNumber().empty() && RequireNumber) + return nullptr; + if (numLeft() != 0) + return nullptr; + return make<SpecialName>("invocation function for block in ", Encoding); + } + + Node *Ty = parseType(); + if (numLeft() != 0) + return nullptr; + return Ty; +} + +bool initializeOutputStream(char *Buf, size_t *N, OutputStream &S, + size_t InitSize) { + size_t BufferSize; + if (Buf == nullptr) { + Buf = static_cast<char *>(std::malloc(InitSize)); + if (Buf == nullptr) + return true; + BufferSize = InitSize; + } else + BufferSize = *N; + + S.reset(Buf, BufferSize); + return false; +} + +} // unnamed namespace + +char *llvm::itaniumDemangle(const char *MangledName, char *Buf, + size_t *N, int *Status) { + if (MangledName == nullptr || (Buf != nullptr && N == nullptr)) { + if (Status) + *Status = demangle_invalid_args; + return nullptr; + } + + int InternalStatus = demangle_success; + Db Parser(MangledName, MangledName + std::strlen(MangledName)); + OutputStream S; + + Node *AST = Parser.parse(); + + if (AST == nullptr) + InternalStatus = demangle_invalid_mangled_name; + else if (initializeOutputStream(Buf, N, S, 1024)) + InternalStatus = demangle_memory_alloc_failure; + else { + assert(Parser.ForwardTemplateRefs.empty()); + AST->print(S); + S += '\0'; + if (N != nullptr) + *N = S.getCurrentPosition(); + Buf = S.getBuffer(); + } + + if (Status) + *Status = InternalStatus; + return InternalStatus == demangle_success ? Buf : nullptr; +} + +namespace llvm { + +ItaniumPartialDemangler::ItaniumPartialDemangler() + : RootNode(nullptr), Context(new Db{nullptr, nullptr}) {} + +ItaniumPartialDemangler::~ItaniumPartialDemangler() { + delete static_cast<Db *>(Context); +} + +ItaniumPartialDemangler::ItaniumPartialDemangler( + ItaniumPartialDemangler &&Other) + : RootNode(Other.RootNode), Context(Other.Context) { + Other.Context = Other.RootNode = nullptr; +} + +ItaniumPartialDemangler &ItaniumPartialDemangler:: +operator=(ItaniumPartialDemangler &&Other) { + std::swap(RootNode, Other.RootNode); + std::swap(Context, Other.Context); + return *this; +} + +// Demangle MangledName into an AST, storing it into this->RootNode. +bool ItaniumPartialDemangler::partialDemangle(const char *MangledName) { + Db *Parser = static_cast<Db *>(Context); + size_t Len = std::strlen(MangledName); + Parser->reset(MangledName, MangledName + Len); + RootNode = Parser->parse(); + return RootNode == nullptr; +} + +static char *printNode(Node *RootNode, char *Buf, size_t *N) { + OutputStream S; + if (initializeOutputStream(Buf, N, S, 128)) + return nullptr; + RootNode->print(S); + S += '\0'; + if (N != nullptr) + *N = S.getCurrentPosition(); + return S.getBuffer(); +} + +char *ItaniumPartialDemangler::getFunctionBaseName(char *Buf, size_t *N) const { + if (!isFunction()) + return nullptr; + + Node *Name = static_cast<FunctionEncoding *>(RootNode)->getName(); + + while (true) { + switch (Name->getKind()) { + case Node::KAbiTagAttr: + Name = static_cast<AbiTagAttr *>(Name)->Base; + continue; + case Node::KStdQualifiedName: + Name = static_cast<StdQualifiedName *>(Name)->Child; + continue; + case Node::KNestedName: + Name = static_cast<NestedName *>(Name)->Name; + continue; + case Node::KLocalName: + Name = static_cast<LocalName *>(Name)->Entity; + continue; + case Node::KNameWithTemplateArgs: + Name = static_cast<NameWithTemplateArgs *>(Name)->Name; + continue; + default: + return printNode(Name, Buf, N); + } + } +} + +char *ItaniumPartialDemangler::getFunctionDeclContextName(char *Buf, + size_t *N) const { + if (!isFunction()) + return nullptr; + Node *Name = static_cast<FunctionEncoding *>(RootNode)->getName(); + + OutputStream S; + if (initializeOutputStream(Buf, N, S, 128)) + return nullptr; + + KeepGoingLocalFunction: + while (true) { + if (Name->getKind() == Node::KAbiTagAttr) { + Name = static_cast<AbiTagAttr *>(Name)->Base; + continue; + } + if (Name->getKind() == Node::KNameWithTemplateArgs) { + Name = static_cast<NameWithTemplateArgs *>(Name)->Name; + continue; + } + break; + } + + switch (Name->getKind()) { + case Node::KStdQualifiedName: + S += "std"; + break; + case Node::KNestedName: + static_cast<NestedName *>(Name)->Qual->print(S); + break; + case Node::KLocalName: { + auto *LN = static_cast<LocalName *>(Name); + LN->Encoding->print(S); + S += "::"; + Name = LN->Entity; + goto KeepGoingLocalFunction; + } + default: + break; + } + S += '\0'; + if (N != nullptr) + *N = S.getCurrentPosition(); + return S.getBuffer(); +} + +char *ItaniumPartialDemangler::getFunctionName(char *Buf, size_t *N) const { + if (!isFunction()) + return nullptr; + auto *Name = static_cast<FunctionEncoding *>(RootNode)->getName(); + return printNode(Name, Buf, N); +} + +char *ItaniumPartialDemangler::getFunctionParameters(char *Buf, + size_t *N) const { + if (!isFunction()) + return nullptr; + NodeArray Params = static_cast<FunctionEncoding *>(RootNode)->getParams(); + + OutputStream S; + if (initializeOutputStream(Buf, N, S, 128)) + return nullptr; + + S += '('; + Params.printWithComma(S); + S += ')'; + S += '\0'; + if (N != nullptr) + *N = S.getCurrentPosition(); + return S.getBuffer(); +} + +char *ItaniumPartialDemangler::getFunctionReturnType( + char *Buf, size_t *N) const { + if (!isFunction()) + return nullptr; + + OutputStream S; + if (initializeOutputStream(Buf, N, S, 128)) + return nullptr; + + if (Node *Ret = static_cast<FunctionEncoding *>(RootNode)->getReturnType()) + Ret->print(S); + + S += '\0'; + if (N != nullptr) + *N = S.getCurrentPosition(); + return S.getBuffer(); +} + +char *ItaniumPartialDemangler::finishDemangle(char *Buf, size_t *N) const { + assert(RootNode != nullptr && "must call partialDemangle()"); + return printNode(static_cast<Node *>(RootNode), Buf, N); +} + +bool ItaniumPartialDemangler::hasFunctionQualifiers() const { + assert(RootNode != nullptr && "must call partialDemangle()"); + if (!isFunction()) + return false; + auto *E = static_cast<FunctionEncoding *>(RootNode); + return E->getCVQuals() != QualNone || E->getRefQual() != FrefQualNone; +} + +bool ItaniumPartialDemangler::isCtorOrDtor() const { + Node *N = static_cast<Node *>(RootNode); + while (N) { + switch (N->getKind()) { + default: + return false; + case Node::KCtorDtorName: + return true; + + case Node::KAbiTagAttr: + N = static_cast<AbiTagAttr *>(N)->Base; + break; + case Node::KFunctionEncoding: + N = static_cast<FunctionEncoding *>(N)->getName(); + break; + case Node::KLocalName: + N = static_cast<LocalName *>(N)->Entity; + break; + case Node::KNameWithTemplateArgs: + N = static_cast<NameWithTemplateArgs *>(N)->Name; + break; + case Node::KNestedName: + N = static_cast<NestedName *>(N)->Name; + break; + case Node::KStdQualifiedName: + N = static_cast<StdQualifiedName *>(N)->Child; + break; + } + } + return false; +} + +bool ItaniumPartialDemangler::isFunction() const { + assert(RootNode != nullptr && "must call partialDemangle()"); + return static_cast<Node *>(RootNode)->getKind() == Node::KFunctionEncoding; +} + +bool ItaniumPartialDemangler::isSpecialName() const { + assert(RootNode != nullptr && "must call partialDemangle()"); + auto K = static_cast<Node *>(RootNode)->getKind(); + return K == Node::KSpecialName || K == Node::KCtorVtableSpecialName; +} + +bool ItaniumPartialDemangler::isData() const { + return !isFunction() && !isSpecialName(); +} + +} |