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Jan 24 2020, 4:02 PM


//===--- Diagnostics.h -------------------------------------------*- C++-*-===//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
#include "Path.h"
#include "Protocol.h"
#include "clang/Basic/Diagnostic.h"
#include "clang/Basic/LangOptions.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/DenseSet.h"
#include "llvm/ADT/None.h"
#include "llvm/ADT/Optional.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/StringSet.h"
#include <cassert>
#include <string>
namespace clang {
namespace tidy {
class ClangTidyContext;
} // namespace tidy
namespace clangd {
struct ClangdDiagnosticOptions {
/// If true, Clangd uses an LSP extension to embed the fixes with the
/// diagnostics that are sent to the client.
bool EmbedFixesInDiagnostics = false;
/// If true, Clangd uses the relatedInformation field to include other
/// locations (in particular attached notes).
/// Otherwise, these are flattened into the diagnostic message.
bool EmitRelatedLocations = false;
/// If true, Clangd uses an LSP extension to send the diagnostic's
/// category to the client. The category typically describes the compilation
/// stage during which the issue was produced, e.g. "Semantic Issue" or "Parse
/// Issue".
bool SendDiagnosticCategory = false;
/// If true, Clangd will add a number of available fixes to the diagnostic's
/// message.
bool DisplayFixesCount = true;
/// Contains basic information about a diagnostic.
struct DiagBase {
std::string Message;
// Intended to be used only in error messages.
// May be relative, absolute or even artifically constructed.
std::string File;
// Absolute path to containing file, if available.
llvm::Optional<std::string> AbsFile;
clangd::Range Range;
DiagnosticsEngine::Level Severity = DiagnosticsEngine::Note;
std::string Category;
// Since File is only descriptive, we store a separate flag to distinguish
// diags from the main file.
bool InsideMainFile = false;
llvm::raw_ostream &operator<<(llvm::raw_ostream &OS, const DiagBase &D);
/// Represents a single fix-it that editor can apply to fix the error.
struct Fix {
/// Message for the fix-it.
std::string Message;
/// TextEdits from clang's fix-its. Must be non-empty.
llvm::SmallVector<TextEdit, 1> Edits;
llvm::raw_ostream &operator<<(llvm::raw_ostream &OS, const Fix &F);
/// Represents a note for the diagnostic. Severity of notes can only be 'note'
/// or 'remark'.
struct Note : DiagBase {};
/// A top-level diagnostic that may have Notes and Fixes.
struct Diag : DiagBase {
unsigned ID; // e.g. member of clang::diag, or clang-tidy assigned ID.
std::string Name; // if ID was recognized.
// The source of this diagnostic.
enum {
} Source = Unknown;
/// Elaborate on the problem, usually pointing to a related piece of code.
std::vector<Note> Notes;
/// *Alternative* fixes for this diagnostic, one should be chosen.
std::vector<Fix> Fixes;
llvm::raw_ostream &operator<<(llvm::raw_ostream &OS, const Diag &D);
/// Conversion to LSP diagnostics. Formats the error message of each diagnostic
/// to include all its notes. Notes inside main file are also provided as
/// separate diagnostics with their corresponding fixits. Notes outside main
/// file do not have a corresponding LSP diagnostic, but can still be included
/// as part of their main diagnostic's message.
void toLSPDiags(
const Diag &D, const URIForFile &File, const ClangdDiagnosticOptions &Opts,
llvm::function_ref<void(clangd::Diagnostic, llvm::ArrayRef<Fix>)> OutFn);
/// Convert from Fix to LSP CodeAction.
CodeAction toCodeAction(const Fix &D, const URIForFile &File);
/// Convert from clang diagnostic level to LSP severity.
int getSeverity(DiagnosticsEngine::Level L);
/// StoreDiags collects the diagnostics that can later be reported by
/// clangd. It groups all notes for a diagnostic into a single Diag
/// and filters out diagnostics that don't mention the main file (i.e. neither
/// the diag itself nor its notes are in the main file).
class StoreDiags : public DiagnosticConsumer {
// The ClangTidyContext populates Source and Name for clang-tidy diagnostics.
std::vector<Diag> take(const clang::tidy::ClangTidyContext *Tidy = nullptr);
void BeginSourceFile(const LangOptions &Opts, const Preprocessor *) override;
void EndSourceFile() override;
void HandleDiagnostic(DiagnosticsEngine::Level DiagLevel,
const clang::Diagnostic &Info) override;
using DiagFixer = std::function<std::vector<Fix>(DiagnosticsEngine::Level,
const clang::Diagnostic &)>;
using LevelAdjuster = std::function<DiagnosticsEngine::Level(
DiagnosticsEngine::Level, const clang::Diagnostic &)>;
/// If set, possibly adds fixes for diagnostics using \p Fixer.
void contributeFixes(DiagFixer Fixer) { this->Fixer = Fixer; }
/// If set, this allows the client of this class to adjust the level of
/// diagnostics, such as promoting warnings to errors, or ignoring
/// diagnostics.
void setLevelAdjuster(LevelAdjuster Adjuster) { this->Adjuster = Adjuster; }
void flushLastDiag();
DiagFixer Fixer = nullptr;
LevelAdjuster Adjuster = nullptr;
std::vector<Diag> Output;
llvm::Optional<LangOptions> LangOpts;
llvm::Optional<Diag> LastDiag;
/// Set iff adjustDiagFromHeader resulted in changes to LastDiag.
bool LastDiagWasAdjusted = false;
llvm::DenseSet<int> IncludeLinesWithErrors;
bool LastPrimaryDiagnosticWasSuppressed = false;
} // namespace clangd
} // namespace clang

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