| 1 | //===- TypeMerger.h ---------------------------------------------*- C++ -*-===// |
|---|---|
| 2 | // |
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | // See https://llvm.org/LICENSE.txt for license information. |
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | |
| 9 | #ifndef LLD_COFF_TYPEMERGER_H |
| 10 | #define LLD_COFF_TYPEMERGER_H |
| 11 | |
| 12 | #include "Config.h" |
| 13 | #include "DebugTypes.h" |
| 14 | #include "lld/Common/Timer.h" |
| 15 | #include "llvm/DebugInfo/CodeView/MergingTypeTableBuilder.h" |
| 16 | #include "llvm/DebugInfo/CodeView/TypeHashing.h" |
| 17 | #include "llvm/Support/Allocator.h" |
| 18 | #include <atomic> |
| 19 | |
| 20 | namespace lld::coff { |
| 21 | |
| 22 | using llvm::codeview::GloballyHashedType; |
| 23 | using llvm::codeview::TypeIndex; |
| 24 | |
| 25 | struct GHashState; |
| 26 | |
| 27 | class TypeMerger { |
| 28 | public: |
| 29 | TypeMerger(COFFLinkerContext &ctx, llvm::BumpPtrAllocator &alloc); |
| 30 | |
| 31 | ~TypeMerger(); |
| 32 | |
| 33 | /// Get the type table or the global type table if /DEBUG:GHASH is enabled. |
| 34 | inline llvm::codeview::TypeCollection &getTypeTable() { |
| 35 | assert(!ctx.config.debugGHashes); |
| 36 | return typeTable; |
| 37 | } |
| 38 | |
| 39 | /// Get the ID table or the global ID table if /DEBUG:GHASH is enabled. |
| 40 | inline llvm::codeview::TypeCollection &getIDTable() { |
| 41 | assert(!ctx.config.debugGHashes); |
| 42 | return idTable; |
| 43 | } |
| 44 | |
| 45 | /// Use global hashes to eliminate duplicate types and identify unique type |
| 46 | /// indices in each TpiSource. |
| 47 | void mergeTypesWithGHash(); |
| 48 | |
| 49 | /// Map from PDB function id type indexes to PDB function type indexes. |
| 50 | /// Populated after mergeTypesWithGHash. |
| 51 | llvm::DenseMap<TypeIndex, TypeIndex> funcIdToType; |
| 52 | |
| 53 | /// Type records that will go into the PDB TPI stream. |
| 54 | llvm::codeview::MergingTypeTableBuilder typeTable; |
| 55 | |
| 56 | /// Item records that will go into the PDB IPI stream. |
| 57 | llvm::codeview::MergingTypeTableBuilder idTable; |
| 58 | |
| 59 | // When showSummary is enabled, these are histograms of TPI and IPI records |
| 60 | // keyed by type index. |
| 61 | SmallVector<uint32_t, 0> tpiCounts; |
| 62 | SmallVector<uint32_t, 0> ipiCounts; |
| 63 | |
| 64 | /// Dependency type sources, such as type servers or PCH object files. These |
| 65 | /// must be processed before objects that rely on them. Set by |
| 66 | /// sortDependencies. |
| 67 | ArrayRef<TpiSource *> dependencySources; |
| 68 | |
| 69 | /// Object file sources. These must be processed after dependencySources. |
| 70 | ArrayRef<TpiSource *> objectSources; |
| 71 | |
| 72 | /// Sorts the dependencies and reassigns TpiSource indices. |
| 73 | void sortDependencies(); |
| 74 | |
| 75 | private: |
| 76 | void clearGHashes(); |
| 77 | |
| 78 | COFFLinkerContext &ctx; |
| 79 | }; |
| 80 | |
| 81 | } // namespace lld::coff |
| 82 | |
| 83 | #endif |
| 84 |