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//===--- Merge.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 LLVM_CLANG_TOOLS_EXTRA_CLANGD_INDEX_MERGE_H
#define LLVM_CLANG_TOOLS_EXTRA_CLANGD_INDEX_MERGE_H
#include "Index.h"
namespace clang {
namespace clangd {
// Merge symbols L and R, preferring data from L in case of conflict.
// The two symbols must have the same ID.
// Returned symbol may contain data owned by either source.
Symbol mergeSymbol(const Symbol &L, const Symbol &R);
// MergedIndex is a composite index based on two provided Indexes:
// - the Dynamic index covers few files, but is relatively up-to-date.
// - the Static index covers a bigger set of files, but is relatively stale.
// The returned index attempts to combine results, and avoid duplicates.
//
// FIXME: We don't have a mechanism in Index to track deleted symbols and
// refs in dirty files, so the merged index may return stale symbols
// and refs from Static index.
class MergedIndex : public SymbolIndex {
const SymbolIndex *Dynamic, *Static;
public:
// The constructor does not access the symbols.
// It's safe to inherit from this class and pass pointers to derived members.
MergedIndex(const SymbolIndex *Dynamic, const SymbolIndex *Static)
: Dynamic(Dynamic), Static(Static) {}
bool fuzzyFind(const FuzzyFindRequest &,
llvm::function_ref<void(const Symbol &)>) const override;
void lookup(const LookupRequest &,
llvm::function_ref<void(const Symbol &)>) const override;
bool refs(const RefsRequest &,
llvm::function_ref<void(const Ref &)>) const override;
void relations(const RelationsRequest &,
llvm::function_ref<void(const SymbolID &, const Symbol &)>)
const override;
size_t estimateMemoryUsage() const override {
return Dynamic->estimateMemoryUsage() + Static->estimateMemoryUsage();
}
};
} // namespace clangd
} // namespace clang
#endif // LLVM_CLANG_TOOLS_EXTRA_CLANGD_INDEX_MERGE_H
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