| //===- TypeMerger.h ---------------------------------------------*- 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 LLD_COFF_TYPEMERGER_H |
| #define LLD_COFF_TYPEMERGER_H |
| |
| #include "Config.h" |
| #include "DebugTypes.h" |
| #include "lld/Common/Timer.h" |
| #include "llvm/DebugInfo/CodeView/MergingTypeTableBuilder.h" |
| #include "llvm/DebugInfo/CodeView/TypeHashing.h" |
| #include "llvm/Support/Allocator.h" |
| #include <atomic> |
| |
| namespace lld { |
| namespace coff { |
| |
| using llvm::codeview::GloballyHashedType; |
| using llvm::codeview::TypeIndex; |
| |
| struct GHashState; |
| |
| class TypeMerger { |
| public: |
| TypeMerger(COFFLinkerContext &ctx, llvm::BumpPtrAllocator &alloc); |
| |
| ~TypeMerger(); |
| |
| /// Get the type table or the global type table if /DEBUG:GHASH is enabled. |
| inline llvm::codeview::TypeCollection &getTypeTable() { |
| assert(!config->debugGHashes); |
| return typeTable; |
| } |
| |
| /// Get the ID table or the global ID table if /DEBUG:GHASH is enabled. |
| inline llvm::codeview::TypeCollection &getIDTable() { |
| assert(!config->debugGHashes); |
| return idTable; |
| } |
| |
| /// Use global hashes to eliminate duplicate types and identify unique type |
| /// indices in each TpiSource. |
| void mergeTypesWithGHash(); |
| |
| /// Map from PDB function id type indexes to PDB function type indexes. |
| /// Populated after mergeTypesWithGHash. |
| llvm::DenseMap<TypeIndex, TypeIndex> funcIdToType; |
| |
| /// Type records that will go into the PDB TPI stream. |
| llvm::codeview::MergingTypeTableBuilder typeTable; |
| |
| /// Item records that will go into the PDB IPI stream. |
| llvm::codeview::MergingTypeTableBuilder idTable; |
| |
| // When showSummary is enabled, these are histograms of TPI and IPI records |
| // keyed by type index. |
| SmallVector<uint32_t, 0> tpiCounts; |
| SmallVector<uint32_t, 0> ipiCounts; |
| |
| /// Dependency type sources, such as type servers or PCH object files. These |
| /// must be processed before objects that rely on them. Set by |
| /// sortDependencies. |
| ArrayRef<TpiSource *> dependencySources; |
| |
| /// Object file sources. These must be processed after dependencySources. |
| ArrayRef<TpiSource *> objectSources; |
| |
| /// Sorts the dependencies and reassigns TpiSource indices. |
| void sortDependencies(); |
| |
| private: |
| void clearGHashes(); |
| |
| COFFLinkerContext &ctx; |
| }; |
| |
| } // namespace coff |
| } // namespace lld |
| |
| #endif |