1//===--- Merge.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 LLVM_CLANG_TOOLS_EXTRA_CLANGD_INDEX_MERGE_H
10#define LLVM_CLANG_TOOLS_EXTRA_CLANGD_INDEX_MERGE_H
11
12#include "index/Index.h"
13
14namespace clang {
15namespace clangd {
16
17// Merge symbols L and R, preferring data from L in case of conflict.
18// The two symbols must have the same ID.
19// Returned symbol may contain data owned by either source.
20Symbol mergeSymbol(const Symbol &L, const Symbol &R);
21
22// MergedIndex is a composite index based on two provided Indexes:
23// - the Dynamic index covers few files, but is relatively up-to-date.
24// - the Static index covers a bigger set of files, but is relatively stale.
25// The returned index attempts to combine results, and avoid duplicates.
26class MergedIndex : public SymbolIndex {
27 const SymbolIndex *Dynamic, *Static;
28
29public:
30 // The constructor does not access the symbols.
31 // It's safe to inherit from this class and pass pointers to derived members.
32 MergedIndex(const SymbolIndex *Dynamic, const SymbolIndex *Static)
33 : Dynamic(Dynamic), Static(Static) {}
34
35 bool fuzzyFind(const FuzzyFindRequest &,
36 llvm::function_ref<void(const Symbol &)>) const override;
37 void lookup(const LookupRequest &,
38 llvm::function_ref<void(const Symbol &)>) const override;
39 bool refs(const RefsRequest &,
40 llvm::function_ref<void(const Ref &)>) const override;
41 void relations(const RelationsRequest &,
42 llvm::function_ref<void(const SymbolID &, const Symbol &)>)
43 const override;
44 llvm::unique_function<IndexContents(llvm::StringRef) const>
45 indexedFiles() const override;
46 size_t estimateMemoryUsage() const override {
47 return Dynamic->estimateMemoryUsage() + Static->estimateMemoryUsage();
48 }
49};
50
51} // namespace clangd
52} // namespace clang
53
54#endif // LLVM_CLANG_TOOLS_EXTRA_CLANGD_INDEX_MERGE_H
55

source code of clang-tools-extra/clangd/index/Merge.h