forked from OSchip/llvm-project
99 lines
3.8 KiB
C++
99 lines
3.8 KiB
C++
//===--- IncludeFixer.h ------------------------------------------*- 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_INCLUDE_FIXER_H
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#define LLVM_CLANG_TOOLS_EXTRA_CLANGD_INCLUDE_FIXER_H
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#include "Diagnostics.h"
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#include "Headers.h"
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#include "index/Index.h"
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#include "index/Symbol.h"
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#include "clang/AST/Type.h"
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#include "clang/Basic/Diagnostic.h"
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#include "clang/Basic/SourceLocation.h"
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#include "clang/Sema/ExternalSemaSource.h"
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#include "clang/Sema/Sema.h"
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/ADT/DenseMap.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/StringMap.h"
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#include "llvm/ADT/StringRef.h"
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#include <memory>
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namespace clang {
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namespace clangd {
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/// Attempts to recover from error diagnostics by suggesting include insertion
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/// fixes. For example, member access into incomplete type can be fixes by
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/// include headers with the definition.
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class IncludeFixer {
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public:
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IncludeFixer(llvm::StringRef File, std::shared_ptr<IncludeInserter> Inserter,
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const SymbolIndex &Index, unsigned IndexRequestLimit)
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: File(File), Inserter(std::move(Inserter)), Index(Index),
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IndexRequestLimit(IndexRequestLimit) {}
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/// Returns include insertions that can potentially recover the diagnostic.
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std::vector<Fix> fix(DiagnosticsEngine::Level DiagLevel,
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const clang::Diagnostic &Info) const;
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/// Returns an ExternalSemaSource that records failed name lookups in Sema.
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/// This allows IncludeFixer to suggest inserting headers that define those
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/// names.
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llvm::IntrusiveRefCntPtr<ExternalSemaSource> unresolvedNameRecorder();
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private:
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/// Attempts to recover diagnostic caused by an incomplete type \p T.
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std::vector<Fix> fixIncompleteType(const Type &T) const;
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/// Generates header insertion fixes for all symbols. Fixes are deduplicated.
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std::vector<Fix> fixesForSymbols(const SymbolSlab &Syms) const;
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struct UnresolvedName {
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std::string Name; // E.g. "X" in foo::X.
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SourceLocation Loc; // Start location of the unresolved name.
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std::vector<std::string> Scopes; // Namespace scopes we should search in.
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};
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/// Records the last unresolved name seen by Sema.
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class UnresolvedNameRecorder;
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/// Attempts to fix the unresolved name associated with the current
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/// diagnostic. We assume a diagnostic is caused by a unresolved name when
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/// they have the same source location and the unresolved name is the last
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/// one we've seen during the Sema run.
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std::vector<Fix> fixUnresolvedName() const;
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std::string File;
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std::shared_ptr<IncludeInserter> Inserter;
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const SymbolIndex &Index;
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const unsigned IndexRequestLimit; // Make at most 5 index requests.
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mutable unsigned IndexRequestCount = 0;
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// These collect the last unresolved name so that we can associate it with the
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// diagnostic.
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llvm::Optional<UnresolvedName> LastUnresolvedName;
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// There can be multiple diagnostics that are caused by the same unresolved
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// name or incomplete type in one parse, especially when code is
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// copy-and-pasted without #includes. We cache the index results based on
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// index requests.
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mutable llvm::StringMap<SymbolSlab> FuzzyFindCache;
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mutable llvm::DenseMap<SymbolID, SymbolSlab> LookupCache;
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// Returns None if the number of index requests has reached the limit.
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llvm::Optional<const SymbolSlab *>
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fuzzyFindCached(const FuzzyFindRequest &Req) const;
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llvm::Optional<const SymbolSlab *> lookupCached(const SymbolID &ID) const;
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};
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} // namespace clangd
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} // namespace clang
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#endif // LLVM_CLANG_TOOLS_EXTRA_CLANGD_INCLUDE_FIXER_H
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