forked from OSchip/llvm-project
135 lines
5.0 KiB
C++
135 lines
5.0 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 "Merge.h"
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#include "clang/Lex/Preprocessor.h"
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#include <memory>
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namespace clang {
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namespace clangd {
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/// Select between in-memory index implementations, which have tradeoffs.
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enum class IndexType {
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// MemIndex is trivially cheap to build, but has poor query performance.
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Light,
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// Dex is relatively expensive to build and uses more memory, but is fast.
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Heavy,
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};
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/// How to handle duplicated symbols across multiple files.
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enum class DuplicateHandling {
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// Pick a random symbol. Less accurate but faster.
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PickOne,
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// Merge symbols. More accurate but slower.
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Merge,
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};
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/// 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 references to snapshots.
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class FileSymbols {
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public:
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/// Updates all symbols and refs in a file.
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/// If either is nullptr, corresponding data for \p Path will be removed.
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void update(PathRef Path, std::unique_ptr<SymbolSlab> Slab,
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std::unique_ptr<RefSlab> Refs);
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// The index keeps the symbols alive.
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std::unique_ptr<SymbolIndex>
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buildIndex(IndexType,
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DuplicateHandling DuplicateHandle = DuplicateHandling::PickOne);
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private:
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mutable std::mutex Mutex;
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/// Stores the latest symbol snapshots for all active files.
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llvm::StringMap<std::shared_ptr<SymbolSlab>> FileToSymbols;
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/// Stores the latest ref snapshots for all active files.
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llvm::StringMap<std::shared_ptr<RefSlab>> FileToRefs;
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};
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/// This manages symbols from files and an in-memory index on all symbols.
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/// FIXME: Expose an interface to remove files that are closed.
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class FileIndex : public MergedIndex {
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public:
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FileIndex(bool UseDex = true);
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/// Update preamble symbols of file \p Path with all declarations in \p AST
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/// and macros in \p PP.
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void updatePreamble(PathRef Path, ASTContext &AST,
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std::shared_ptr<Preprocessor> PP);
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/// Update symbols and references from main file \p Path with
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/// `indexMainDecls`.
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void updateMain(PathRef Path, ParsedAST &AST);
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private:
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bool UseDex; // FIXME: this should be always on.
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// Contains information from each file's preamble only.
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// These are large, but update fairly infrequently (preambles are stable).
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// Missing information:
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// - symbol refs (these are always "from the main file")
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// - definition locations in the main file
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//
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// FIXME: Because the preambles for different TUs have large overlap and
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// FileIndex doesn't deduplicate, this uses lots of extra RAM.
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// The biggest obstacle in fixing this: the obvious approach of partitioning
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// by declaring file (rather than main file) fails if headers provide
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// different symbols based on preprocessor state.
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FileSymbols PreambleSymbols;
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SwapIndex PreambleIndex;
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// Contains information from each file's main AST.
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// These are updated frequently (on file change), but are relatively small.
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// Mostly contains:
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// - refs to symbols declared in the preamble and referenced from main
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// - symbols declared both in the main file and the preamble
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// (Note that symbols *only* in the main file are not indexed).
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FileSymbols MainFileSymbols;
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SwapIndex MainFileIndex;
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};
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/// Retrieves symbols and refs of local top level decls in \p AST (i.e.
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/// `AST.getLocalTopLevelDecls()`).
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/// Exposed to assist in unit tests.
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std::pair<SymbolSlab, RefSlab> indexMainDecls(ParsedAST &AST);
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/// Idex declarations from \p AST and macros from \p PP that are declared in
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/// included headers.
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SymbolSlab indexHeaderSymbols(ASTContext &AST,
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std::shared_ptr<Preprocessor> PP);
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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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