| //==- SymbolCache.h - Cache of native symbols and ids ------------*- C++ -*-==// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_DEBUGINFO_PDB_NATIVE_SYMBOLCACHE_H |
| #define LLVM_DEBUGINFO_PDB_NATIVE_SYMBOLCACHE_H |
| |
| #include "llvm/ADT/DenseMap.h" |
| #include "llvm/DebugInfo/CodeView/TypeDeserializer.h" |
| #include "llvm/DebugInfo/CodeView/TypeIndex.h" |
| #include "llvm/DebugInfo/CodeView/TypeRecord.h" |
| #include "llvm/DebugInfo/PDB/Native/NativeRawSymbol.h" |
| #include "llvm/Support/Allocator.h" |
| |
| #include <memory> |
| #include <vector> |
| |
| namespace llvm { |
| namespace pdb { |
| class DbiStream; |
| class PDBFile; |
| |
| class SymbolCache { |
| NativeSession &Session; |
| DbiStream *Dbi = nullptr; |
| |
| /// Cache of all stable symbols, indexed by SymIndexId. Just because a |
| /// symbol has been parsed does not imply that it will be stable and have |
| /// an Id. Id allocation is an implementation, with the only guarantee |
| /// being that once an Id is allocated, the symbol can be assumed to be |
| /// cached. |
| std::vector<std::unique_ptr<NativeRawSymbol>> Cache; |
| |
| /// For type records from the TPI stream which have been paresd and cached, |
| /// stores a mapping to SymIndexId of the cached symbol. |
| DenseMap<codeview::TypeIndex, SymIndexId> TypeIndexToSymbolId; |
| |
| /// For field list members which have been parsed and cached, stores a mapping |
| /// from (IndexOfClass, MemberIndex) to the corresponding SymIndexId of the |
| /// cached symbol. |
| DenseMap<std::pair<codeview::TypeIndex, uint32_t>, SymIndexId> |
| FieldListMembersToSymbolId; |
| |
| /// List of SymIndexIds for each compiland, indexed by compiland index as they |
| /// appear in the PDB file. |
| std::vector<SymIndexId> Compilands; |
| |
| /// Map from global symbol offset to SymIndexId. |
| DenseMap<uint32_t, SymIndexId> GlobalOffsetToSymbolId; |
| |
| SymIndexId createSymbolPlaceholder() { |
| SymIndexId Id = Cache.size(); |
| Cache.push_back(nullptr); |
| return Id; |
| } |
| |
| template <typename ConcreteSymbolT, typename CVRecordT, typename... Args> |
| SymIndexId createSymbolForType(codeview::TypeIndex TI, codeview::CVType CVT, |
| Args &&... ConstructorArgs) { |
| CVRecordT Record; |
| if (auto EC = |
| codeview::TypeDeserializer::deserializeAs<CVRecordT>(CVT, Record)) { |
| consumeError(std::move(EC)); |
| return 0; |
| } |
| |
| return createSymbol<ConcreteSymbolT>( |
| TI, std::move(Record), std::forward<Args>(ConstructorArgs)...); |
| } |
| |
| SymIndexId createSymbolForModifiedType(codeview::TypeIndex ModifierTI, |
| codeview::CVType CVT); |
| |
| SymIndexId createSimpleType(codeview::TypeIndex TI, |
| codeview::ModifierOptions Mods); |
| |
| public: |
| SymbolCache(NativeSession &Session, DbiStream *Dbi); |
| |
| template <typename ConcreteSymbolT, typename... Args> |
| SymIndexId createSymbol(Args &&... ConstructorArgs) { |
| SymIndexId Id = Cache.size(); |
| |
| // Initial construction must not access the cache, since it must be done |
| // atomically. |
| auto Result = llvm::make_unique<ConcreteSymbolT>( |
| Session, Id, std::forward<Args>(ConstructorArgs)...); |
| Result->SymbolId = Id; |
| |
| NativeRawSymbol *NRS = static_cast<NativeRawSymbol *>(Result.get()); |
| Cache.push_back(std::move(Result)); |
| |
| // After the item is in the cache, we can do further initialization which |
| // is then allowed to access the cache. |
| NRS->initialize(); |
| return Id; |
| } |
| |
| std::unique_ptr<IPDBEnumSymbols> |
| createTypeEnumerator(codeview::TypeLeafKind Kind); |
| |
| std::unique_ptr<IPDBEnumSymbols> |
| createTypeEnumerator(std::vector<codeview::TypeLeafKind> Kinds); |
| |
| std::unique_ptr<IPDBEnumSymbols> |
| createGlobalsEnumerator(codeview::SymbolKind Kind); |
| |
| SymIndexId findSymbolByTypeIndex(codeview::TypeIndex TI); |
| |
| template <typename ConcreteSymbolT, typename... Args> |
| SymIndexId getOrCreateFieldListMember(codeview::TypeIndex FieldListTI, |
| uint32_t Index, |
| Args &&... ConstructorArgs) { |
| SymIndexId SymId = Cache.size(); |
| std::pair<codeview::TypeIndex, uint32_t> Key{FieldListTI, Index}; |
| auto Result = FieldListMembersToSymbolId.try_emplace(Key, SymId); |
| if (Result.second) |
| SymId = |
| createSymbol<ConcreteSymbolT>(std::forward<Args>(ConstructorArgs)...); |
| else |
| SymId = Result.first->second; |
| return SymId; |
| } |
| |
| SymIndexId getOrCreateGlobalSymbolByOffset(uint32_t Offset); |
| |
| std::unique_ptr<PDBSymbolCompiland> getOrCreateCompiland(uint32_t Index); |
| uint32_t getNumCompilands() const; |
| |
| std::unique_ptr<PDBSymbol> getSymbolById(SymIndexId SymbolId) const; |
| |
| NativeRawSymbol &getNativeSymbolById(SymIndexId SymbolId) const; |
| |
| template <typename ConcreteT> |
| ConcreteT &getNativeSymbolById(SymIndexId SymbolId) const { |
| return static_cast<ConcreteT &>(getNativeSymbolById(SymbolId)); |
| } |
| }; |
| |
| } // namespace pdb |
| } // namespace llvm |
| |
| #endif |