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