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
20namespace lld::coff {
21
22using llvm::codeview::GloballyHashedType;
23using llvm::codeview::TypeIndex;
24
25struct GHashState;
26
27class TypeMerger {
28public:
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
75private:
76 void clearGHashes();
77
78 COFFLinkerContext &ctx;
79};
80
81} // namespace lld::coff
82
83#endif
84

source code of lld/COFF/TypeMerger.h