forked from OSchip/llvm-project
92 lines
3.4 KiB
C++
92 lines
3.4 KiB
C++
//===--- FileIndex.h - Index for files. ---------------------------- C++-*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// FileIndex implements SymbolIndex for symbols from a set of files. Symbols are
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// maintained at source-file granuality (e.g. with ASTs), and files can be
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// updated dynamically.
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//
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//===---------------------------------------------------------------------===//
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#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANGD_INDEX_FILEINDEX_H
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#define LLVM_CLANG_TOOLS_EXTRA_CLANGD_INDEX_FILEINDEX_H
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#include "../ClangdUnit.h"
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#include "Index.h"
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#include "MemIndex.h"
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#include "clang/Lex/Preprocessor.h"
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namespace clang {
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namespace clangd {
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/// \brief A container of Symbols from several source files. It can be updated
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/// at source-file granularity, replacing all symbols from one file with a new
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/// set.
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///
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/// This implements a snapshot semantics for symbols in a file. Each update to a
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/// file will create a new snapshot for all symbols in the file. Snapshots are
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/// managed with shared pointers that are shared between this class and the
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/// users. For each file, this class only stores a pointer pointing to the
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/// newest snapshot, and an outdated snapshot is deleted by the last owner of
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/// the snapshot, either this class or the symbol index.
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///
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/// The snapshot semantics keeps critical sections minimal since we only need
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/// locking when we swap or obtain refereces to snapshots.
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class FileSymbols {
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public:
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/// \brief Updates all symbols in a file. If \p Slab is nullptr, symbols for
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/// \p Path will be removed.
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void update(PathRef Path, std::unique_ptr<SymbolSlab> Slab);
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// The shared_ptr keeps the symbols alive
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std::shared_ptr<std::vector<const Symbol *>> allSymbols();
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private:
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mutable std::mutex Mutex;
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/// \brief Stores the latest snapshots for all active files.
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llvm::StringMap<std::shared_ptr<SymbolSlab>> FileToSlabs;
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};
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/// \brief This manages symbls from files and an in-memory index on all symbols.
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class FileIndex : public SymbolIndex {
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public:
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/// If URISchemes is empty, the default schemes in SymbolCollector will be
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/// used.
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FileIndex(std::vector<std::string> URISchemes = {});
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/// \brief Update symbols in \p Path with symbols in \p AST. If \p AST is
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/// nullptr, this removes all symbols in the file.
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/// If \p AST is not null, \p PP cannot be null and it should be the
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/// preprocessor that was used to build \p AST.
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void update(PathRef Path, ASTContext *AST, std::shared_ptr<Preprocessor> PP);
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bool
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fuzzyFind(const FuzzyFindRequest &Req,
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llvm::function_ref<void(const Symbol &)> Callback) const override;
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void lookup(const LookupRequest &Req,
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llvm::function_ref<void(const Symbol &)> Callback) const override;
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private:
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FileSymbols FSymbols;
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MemIndex Index;
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std::vector<std::string> URISchemes;
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};
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/// Retrieves namespace and class level symbols in \p AST.
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/// Exposed to assist in unit tests.
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/// If URISchemes is empty, the default schemes in SymbolCollector will be used.
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SymbolSlab indexAST(ASTContext &AST, std::shared_ptr<Preprocessor> PP,
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llvm::ArrayRef<std::string> URISchemes = {});
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} // namespace clangd
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} // namespace clang
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#endif // LLVM_CLANG_TOOLS_EXTRA_CLANGD_INDEX_FILEINDEX_H
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