| 1 | //===- TypeMerger.h ---------------------------------------------*- C++ -*-===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | #ifndef LLD_COFF_TYPEMERGER_H |
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| 10 | #define LLD_COFF_TYPEMERGER_H |
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| 11 | |
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| 12 | #include "COFFLinkerContext.h" |
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| 13 | #include "Config.h" |
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| 14 | #include "DebugTypes.h" |
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| 15 | #include "lld/Common/Timer.h" |
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| 16 | #include "llvm/DebugInfo/CodeView/MergingTypeTableBuilder.h" |
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| 17 | #include "llvm/DebugInfo/CodeView/TypeHashing.h" |
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| 18 | #include "llvm/Support/Allocator.h" |
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| 19 | #include <atomic> |
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| 20 | |
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| 21 | namespace lld::coff { |
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| 22 | |
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| 23 | using llvm::codeview::GloballyHashedType; |
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| 24 | using llvm::codeview::TypeIndex; |
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| 25 | |
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| 26 | struct GHashState; |
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| 27 | |
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| 28 | class TypeMerger { |
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| 29 | public: |
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| 30 | TypeMerger(COFFLinkerContext &ctx, llvm::BumpPtrAllocator &alloc); |
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| 31 | |
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| 32 | ~TypeMerger(); |
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| 33 | |
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| 34 | /// Get the type table or the global type table if /DEBUG:GHASH is enabled. |
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| 35 | inline llvm::codeview::TypeCollection &getTypeTable() { |
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| 36 | assert(!ctx.config.debugGHashes); |
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| 37 | return typeTable; |
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| 38 | } |
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| 39 | |
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| 40 | /// Get the ID table or the global ID table if /DEBUG:GHASH is enabled. |
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| 41 | inline llvm::codeview::TypeCollection &getIDTable() { |
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| 42 | assert(!ctx.config.debugGHashes); |
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| 43 | return idTable; |
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| 44 | } |
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| 45 | |
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| 46 | /// Use global hashes to eliminate duplicate types and identify unique type |
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| 47 | /// indices in each TpiSource. |
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| 48 | void mergeTypesWithGHash(); |
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| 49 | |
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| 50 | /// Map from PDB function id type indexes to PDB function type indexes. |
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| 51 | /// Populated after mergeTypesWithGHash. |
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| 52 | llvm::DenseMap<TypeIndex, TypeIndex> funcIdToType; |
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| 53 | |
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| 54 | /// Type records that will go into the PDB TPI stream. |
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| 55 | llvm::codeview::MergingTypeTableBuilder typeTable; |
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| 56 | |
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| 57 | /// Item records that will go into the PDB IPI stream. |
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| 58 | llvm::codeview::MergingTypeTableBuilder idTable; |
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| 59 | |
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| 60 | // When showSummary is enabled, these are histograms of TPI and IPI records |
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| 61 | // keyed by type index. |
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| 62 | SmallVector<uint32_t, 0> tpiCounts; |
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| 63 | SmallVector<uint32_t, 0> ipiCounts; |
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| 64 | |
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| 65 | /// Dependency type sources, such as type servers or PCH object files. These |
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| 66 | /// must be processed before objects that rely on them. Set by |
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| 67 | /// sortDependencies. |
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| 68 | ArrayRef<TpiSource *> dependencySources; |
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| 69 | |
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| 70 | /// Object file sources. These must be processed after dependencySources. |
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| 71 | ArrayRef<TpiSource *> objectSources; |
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| 72 | |
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| 73 | /// Sorts the dependencies and reassigns TpiSource indices. |
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| 74 | void sortDependencies(); |
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| 75 | |
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| 76 | private: |
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| 77 | void clearGHashes(); |
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| 78 | |
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| 79 | COFFLinkerContext &ctx; |
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| 80 | }; |
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| 81 | |
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| 82 | } // namespace lld::coff |
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| 83 | |
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| 84 | #endif |
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| 85 | |
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