forked from OSchip/llvm-project
333 lines
14 KiB
C++
333 lines
14 KiB
C++
//===--- ClangdServer.h - Main clangd server code ----------------*- C++-*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANGD_CLANGDSERVER_H
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#define LLVM_CLANG_TOOLS_EXTRA_CLANGD_CLANGDSERVER_H
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#include "../clang-tidy/ClangTidyOptions.h"
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#include "Cancellation.h"
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#include "ClangdUnit.h"
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#include "CodeComplete.h"
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#include "FSProvider.h"
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#include "FormattedString.h"
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#include "Function.h"
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#include "GlobalCompilationDatabase.h"
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#include "Protocol.h"
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#include "SemanticHighlighting.h"
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#include "TUScheduler.h"
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#include "XRefs.h"
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#include "index/Background.h"
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#include "index/FileIndex.h"
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#include "index/Index.h"
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#include "refactor/Tweak.h"
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#include "clang/Tooling/CompilationDatabase.h"
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#include "clang/Tooling/Core/Replacement.h"
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#include "llvm/ADT/FunctionExtras.h"
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#include "llvm/ADT/IntrusiveRefCntPtr.h"
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#include "llvm/ADT/Optional.h"
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#include "llvm/ADT/StringRef.h"
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#include <functional>
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#include <future>
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#include <string>
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#include <type_traits>
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#include <utility>
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namespace clang {
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namespace clangd {
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// FIXME: find a better name.
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class DiagnosticsConsumer {
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public:
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virtual ~DiagnosticsConsumer() = default;
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/// Called by ClangdServer when \p Diagnostics for \p File are ready.
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virtual void onDiagnosticsReady(PathRef File,
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std::vector<Diag> Diagnostics) = 0;
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/// Called whenever the file status is updated.
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virtual void onFileUpdated(PathRef File, const TUStatus &Status){};
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/// Called by ClangdServer when some \p Highlightings for \p File are ready.
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virtual void
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onHighlightingsReady(PathRef File,
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std::vector<HighlightingToken> Highlightings) {}
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};
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/// When set, used by ClangdServer to get clang-tidy options for each particular
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/// file. Must be thread-safe. We use this instead of ClangTidyOptionsProvider
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/// to allow reading tidy configs from the VFS used for parsing.
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using ClangTidyOptionsBuilder = std::function<tidy::ClangTidyOptions(
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llvm::vfs::FileSystem &, llvm::StringRef /*File*/)>;
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/// Manages a collection of source files and derived data (ASTs, indexes),
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/// and provides language-aware features such as code completion.
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///
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/// The primary client is ClangdLSPServer which exposes these features via
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/// the Language Server protocol. ClangdServer may also be embedded directly,
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/// though its API is not stable over time.
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///
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/// ClangdServer should be used from a single thread. Many potentially-slow
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/// operations have asynchronous APIs and deliver their results on another
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/// thread.
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/// Such operations support cancellation: if the caller sets up a cancelable
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/// context, many operations will notice cancellation and fail early.
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/// (ClangdLSPServer uses this to implement $/cancelRequest).
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class ClangdServer {
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public:
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struct Options {
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/// To process requests asynchronously, ClangdServer spawns worker threads.
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/// If this is zero, no threads are spawned. All work is done on the calling
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/// thread, and callbacks are invoked before "async" functions return.
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unsigned AsyncThreadsCount = getDefaultAsyncThreadsCount();
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/// AST caching policy. The default is to keep up to 3 ASTs in memory.
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ASTRetentionPolicy RetentionPolicy;
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/// Cached preambles are potentially large. If false, store them on disk.
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bool StorePreamblesInMemory = true;
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/// If true, ClangdServer builds a dynamic in-memory index for symbols in
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/// opened files and uses the index to augment code completion results.
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bool BuildDynamicSymbolIndex = false;
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/// Use a heavier and faster in-memory index implementation.
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bool HeavyweightDynamicSymbolIndex = true;
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/// If true, ClangdServer automatically indexes files in the current project
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/// on background threads. The index is stored in the project root.
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bool BackgroundIndex = false;
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/// If set to non-zero, the background index rebuilds the symbol index
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/// periodically every BuildIndexPeriodMs milliseconds; otherwise, the
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/// symbol index will be updated for each indexed file.
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size_t BackgroundIndexRebuildPeriodMs = 0;
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/// If set, use this index to augment code completion results.
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SymbolIndex *StaticIndex = nullptr;
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/// If set, enable clang-tidy in clangd and use to it get clang-tidy
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/// configurations for a particular file.
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/// Clangd supports only a small subset of ClangTidyOptions, these options
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/// (Checks, CheckOptions) are about which clang-tidy checks will be
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/// enabled.
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ClangTidyOptionsBuilder GetClangTidyOptions;
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/// Clangd's workspace root. Relevant for "workspace" operations not bound
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/// to a particular file.
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/// FIXME: If not set, should use the current working directory.
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llvm::Optional<std::string> WorkspaceRoot;
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/// The resource directory is used to find internal headers, overriding
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/// defaults and -resource-dir compiler flag).
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/// If None, ClangdServer calls CompilerInvocation::GetResourcePath() to
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/// obtain the standard resource directory.
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llvm::Optional<std::string> ResourceDir = llvm::None;
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/// Time to wait after a new file version before computing diagnostics.
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std::chrono::steady_clock::duration UpdateDebounce =
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std::chrono::milliseconds(500);
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bool SuggestMissingIncludes = false;
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/// Enable hidden features mostly useful to clangd developers.
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/// e.g. tweaks to dump the AST.
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bool HiddenFeatures = false;
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/// Clangd will execute compiler drivers matching one of these globs to
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/// fetch system include path.
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std::vector<std::string> QueryDriverGlobs;
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/// Enable semantic highlighting features.
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bool SemanticHighlighting = false;
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};
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// Sensible default options for use in tests.
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// Features like indexing must be enabled if desired.
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static Options optsForTest();
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/// Creates a new ClangdServer instance.
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///
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/// ClangdServer uses \p CDB to obtain compilation arguments for parsing. Note
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/// that ClangdServer only obtains compilation arguments once for each newly
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/// added file (i.e., when processing a first call to addDocument) and reuses
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/// those arguments for subsequent reparses. However, ClangdServer will check
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/// if compilation arguments changed on calls to forceReparse().
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///
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/// After each parsing request finishes, ClangdServer reports diagnostics to
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/// \p DiagConsumer. Note that a callback to \p DiagConsumer happens on a
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/// worker thread. Therefore, instances of \p DiagConsumer must properly
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/// synchronize access to shared state.
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ClangdServer(const GlobalCompilationDatabase &CDB,
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const FileSystemProvider &FSProvider,
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DiagnosticsConsumer &DiagConsumer, const Options &Opts);
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/// Add a \p File to the list of tracked C++ files or update the contents if
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/// \p File is already tracked. Also schedules parsing of the AST for it on a
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/// separate thread. When the parsing is complete, DiagConsumer passed in
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/// constructor will receive onDiagnosticsReady callback.
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void addDocument(PathRef File, StringRef Contents,
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WantDiagnostics WD = WantDiagnostics::Auto);
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/// Get the contents of \p File, which should have been added.
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llvm::StringRef getDocument(PathRef File) const;
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/// Remove \p File from list of tracked files, schedule a request to free
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/// resources associated with it. Pending diagnostics for closed files may not
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/// be delivered, even if requested with WantDiags::Auto or WantDiags::Yes.
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void removeDocument(PathRef File);
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/// Run code completion for \p File at \p Pos.
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/// Request is processed asynchronously.
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///
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/// This method should only be called for currently tracked files. However, it
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/// is safe to call removeDocument for \p File after this method returns, even
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/// while returned future is not yet ready.
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/// A version of `codeComplete` that runs \p Callback on the processing thread
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/// when codeComplete results become available.
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void codeComplete(PathRef File, Position Pos,
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const clangd::CodeCompleteOptions &Opts,
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Callback<CodeCompleteResult> CB);
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/// Provide signature help for \p File at \p Pos. This method should only be
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/// called for tracked files.
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void signatureHelp(PathRef File, Position Pos, Callback<SignatureHelp> CB);
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/// Find declaration/definition locations of symbol at a specified position.
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void locateSymbolAt(PathRef File, Position Pos,
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Callback<std::vector<LocatedSymbol>> CB);
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/// Helper function that returns a path to the corresponding source file when
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/// given a header file and vice versa.
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llvm::Optional<Path> switchSourceHeader(PathRef Path);
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/// Get document highlights for a given position.
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void findDocumentHighlights(PathRef File, Position Pos,
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Callback<std::vector<DocumentHighlight>> CB);
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/// Get code hover for a given position.
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void findHover(PathRef File, Position Pos,
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Callback<llvm::Optional<HoverInfo>> CB);
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/// Get information about type hierarchy for a given position.
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void typeHierarchy(PathRef File, Position Pos, int Resolve,
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TypeHierarchyDirection Direction,
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Callback<llvm::Optional<TypeHierarchyItem>> CB);
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/// Retrieve the top symbols from the workspace matching a query.
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void workspaceSymbols(StringRef Query, int Limit,
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Callback<std::vector<SymbolInformation>> CB);
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/// Retrieve the symbols within the specified file.
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void documentSymbols(StringRef File,
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Callback<std::vector<DocumentSymbol>> CB);
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/// Retrieve locations for symbol references.
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void findReferences(PathRef File, Position Pos, uint32_t Limit,
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Callback<std::vector<Location>> CB);
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/// Run formatting for \p Rng inside \p File with content \p Code.
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llvm::Expected<tooling::Replacements> formatRange(StringRef Code,
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PathRef File, Range Rng);
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/// Run formatting for the whole \p File with content \p Code.
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llvm::Expected<tooling::Replacements> formatFile(StringRef Code,
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PathRef File);
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/// Run formatting after \p TriggerText was typed at \p Pos in \p File with
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/// content \p Code.
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llvm::Expected<std::vector<TextEdit>> formatOnType(StringRef Code,
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PathRef File, Position Pos,
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StringRef TriggerText);
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/// Rename all occurrences of the symbol at the \p Pos in \p File to
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/// \p NewName.
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void rename(PathRef File, Position Pos, llvm::StringRef NewName,
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Callback<std::vector<TextEdit>> CB);
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struct TweakRef {
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std::string ID; /// ID to pass for applyTweak.
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std::string Title; /// A single-line message to show in the UI.
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Tweak::Intent Intent;
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};
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/// Enumerate the code tweaks available to the user at a specified point.
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void enumerateTweaks(PathRef File, Range Sel,
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Callback<std::vector<TweakRef>> CB);
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/// Apply the code tweak with a specified \p ID.
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void applyTweak(PathRef File, Range Sel, StringRef ID,
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Callback<Tweak::Effect> CB);
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/// Only for testing purposes.
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/// Waits until all requests to worker thread are finished and dumps AST for
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/// \p File. \p File must be in the list of added documents.
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void dumpAST(PathRef File, llvm::unique_function<void(std::string)> Callback);
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/// Called when an event occurs for a watched file in the workspace.
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void onFileEvent(const DidChangeWatchedFilesParams &Params);
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/// Get symbol info for given position.
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/// Clangd extension - not part of official LSP.
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void symbolInfo(PathRef File, Position Pos,
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Callback<std::vector<SymbolDetails>> CB);
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/// Returns estimated memory usage for each of the currently open files.
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/// The order of results is unspecified.
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/// Overall memory usage of clangd may be significantly more than reported
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/// here, as this metric does not account (at least) for:
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/// - memory occupied by static and dynamic index,
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/// - memory required for in-flight requests,
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/// FIXME: those metrics might be useful too, we should add them.
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std::vector<std::pair<Path, std::size_t>> getUsedBytesPerFile() const;
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// Blocks the main thread until the server is idle. Only for use in tests.
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// Returns false if the timeout expires.
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LLVM_NODISCARD bool
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blockUntilIdleForTest(llvm::Optional<double> TimeoutSeconds = 10);
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private:
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/// FIXME: This stats several files to find a .clang-format file. I/O can be
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/// slow. Think of a way to cache this.
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llvm::Expected<tooling::Replacements>
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formatCode(llvm::StringRef Code, PathRef File,
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ArrayRef<tooling::Range> Ranges);
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const FileSystemProvider &FSProvider;
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Path ResourceDir;
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// The index used to look up symbols. This could be:
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// - null (all index functionality is optional)
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// - the dynamic index owned by ClangdServer (DynamicIdx)
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// - the static index passed to the constructor
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// - a merged view of a static and dynamic index (MergedIndex)
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const SymbolIndex *Index = nullptr;
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// If present, an index of symbols in open files. Read via *Index.
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std::unique_ptr<FileIndex> DynamicIdx;
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// If present, the new "auto-index" maintained in background threads.
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std::unique_ptr<BackgroundIndex> BackgroundIdx;
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// Storage for merged views of the various indexes.
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std::vector<std::unique_ptr<SymbolIndex>> MergedIdx;
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// When set, provides clang-tidy options for a specific file.
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ClangTidyOptionsBuilder GetClangTidyOptions;
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// If this is true, suggest include insertion fixes for diagnostic errors that
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// can be caused by missing includes (e.g. member access in incomplete type).
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bool SuggestMissingIncludes = false;
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bool EnableHiddenFeatures = false;
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// GUARDED_BY(CachedCompletionFuzzyFindRequestMutex)
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llvm::StringMap<llvm::Optional<FuzzyFindRequest>>
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CachedCompletionFuzzyFindRequestByFile;
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mutable std::mutex CachedCompletionFuzzyFindRequestMutex;
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llvm::Optional<std::string> WorkspaceRoot;
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// WorkScheduler has to be the last member, because its destructor has to be
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// called before all other members to stop the worker thread that references
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// ClangdServer.
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TUScheduler WorkScheduler;
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};
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} // namespace clangd
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} // namespace clang
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#endif
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