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//===--- DiagnosticIDs.h - Diagnostic IDs Handling --------------*- C++ -*-===//
// The LLVM Compiler Infrastructure
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
/// \file
/// \brief Defines the Diagnostic IDs-related interfaces.
#include "clang/Basic/LLVM.h"
#include "llvm/ADT/IntrusiveRefCntPtr.h"
#include "llvm/ADT/StringRef.h"
namespace clang {
class DiagnosticsEngine;
class SourceLocation;
// Import the diagnostic enums themselves.
namespace diag {
// Start position for diagnostics.
enum {
class CustomDiagInfo;
/// \brief All of the diagnostics that can be emitted by the frontend.
typedef unsigned kind;
// Get typedefs for common diagnostics.
enum {
#include "clang/Basic/"
#undef DIAG
/// Enum values that allow the client to map NOTEs, WARNINGs, and EXTENSIONs
/// to either MAP_IGNORE (nothing), MAP_REMARK (emit a remark), MAP_WARNING
/// (emit a warning), MAP_ERROR (emit as an error). It allows clients to
/// map errors to MAP_ERROR/MAP_DEFAULT or MAP_FATAL (stop emitting
/// diagnostics after this one).
enum Mapping {
// NOTE: 0 means "uncomputed".
MAP_IGNORE = 1, ///< Map this diagnostic to nothing, ignore it.
MAP_REMARK = 2, ///< Map this diagnostic to a remark.
MAP_WARNING = 3, ///< Map this diagnostic to a warning.
MAP_ERROR = 4, ///< Map this diagnostic to an error.
MAP_FATAL = 5 ///< Map this diagnostic to a fatal error.
class DiagnosticMappingInfo {
unsigned Mapping : 3;
unsigned IsUser : 1;
unsigned IsPragma : 1;
unsigned HasShowInSystemHeader : 1;
unsigned HasNoWarningAsError : 1;
unsigned HasNoErrorAsFatal : 1;
static DiagnosticMappingInfo Make(diag::Mapping Mapping, bool IsUser,
bool IsPragma) {
DiagnosticMappingInfo Result;
Result.Mapping = Mapping;
Result.IsUser = IsUser;
Result.IsPragma = IsPragma;
Result.HasShowInSystemHeader = 0;
Result.HasNoWarningAsError = 0;
Result.HasNoErrorAsFatal = 0;
return Result;
diag::Mapping getMapping() const { return diag::Mapping(Mapping); }
void setMapping(diag::Mapping Value) { Mapping = Value; }
bool isUser() const { return IsUser; }
bool isPragma() const { return IsPragma; }
bool hasShowInSystemHeader() const { return HasShowInSystemHeader; }
void setShowInSystemHeader(bool Value) { HasShowInSystemHeader = Value; }
bool hasNoWarningAsError() const { return HasNoWarningAsError; }
void setNoWarningAsError(bool Value) { HasNoWarningAsError = Value; }
bool hasNoErrorAsFatal() const { return HasNoErrorAsFatal; }
void setNoErrorAsFatal(bool Value) { HasNoErrorAsFatal = Value; }
/// \brief Used for handling and querying diagnostic IDs.
/// Can be used and shared by multiple Diagnostics for multiple translation units.
class DiagnosticIDs : public RefCountedBase<DiagnosticIDs> {
/// \brief The level of the diagnostic, after it has been through mapping.
enum Level {
Ignored, Note, Remark, Warning, Error, Fatal
/// \brief Information for uniquing and looking up custom diags.
diag::CustomDiagInfo *CustomDiagInfo;
/// \brief Return an ID for a diagnostic with the specified format string and
/// level.
/// If this is the first request for this diagnostic, it is registered and
/// created, otherwise the existing ID is returned.
// FIXME: Replace this function with a create-only facilty like
// createCustomDiagIDFromFormatString() to enforce safe usage. At the time of
// writing, nearly all callers of this function were invalid.
unsigned getCustomDiagID(Level L, StringRef FormatString);
// Diagnostic classification and reporting interfaces.
/// \brief Given a diagnostic ID, return a description of the issue.
StringRef getDescription(unsigned DiagID) const;
/// \brief Return true if the unmapped diagnostic levelof the specified
/// diagnostic ID is a Warning or Extension.
/// This only works on builtin diagnostics, not custom ones, and is not
/// legal to call on NOTEs.
static bool isBuiltinWarningOrExtension(unsigned DiagID);
/// \brief Return true if the specified diagnostic is mapped to errors by
/// default.
static bool isDefaultMappingAsError(unsigned DiagID);
/// \brief Return true if the specified diagnostic is a Remark.
static bool isRemark(unsigned DiagID);
/// \brief Determine whether the given built-in diagnostic ID is a Note.
static bool isBuiltinNote(unsigned DiagID);
/// \brief Determine whether the given built-in diagnostic ID is for an
/// extension of some sort.
static bool isBuiltinExtensionDiag(unsigned DiagID) {
bool ignored;
return isBuiltinExtensionDiag(DiagID, ignored);
/// \brief Determine whether the given built-in diagnostic ID is for an
/// extension of some sort, and whether it is enabled by default.
/// This also returns EnabledByDefault, which is set to indicate whether the
/// diagnostic is ignored by default (in which case -pedantic enables it) or
/// treated as a warning/error by default.
static bool isBuiltinExtensionDiag(unsigned DiagID, bool &EnabledByDefault);
/// \brief Return the lowest-level warning option that enables the specified
/// diagnostic.
/// If there is no -Wfoo flag that controls the diagnostic, this returns null.
static StringRef getWarningOptionForDiag(unsigned DiagID);
/// \brief Return the category number that a specified \p DiagID belongs to,
/// or 0 if no category.
static unsigned getCategoryNumberForDiag(unsigned DiagID);
/// \brief Return the number of diagnostic categories.
static unsigned getNumberOfCategories();
/// \brief Given a category ID, return the name of the category.
static StringRef getCategoryNameFromID(unsigned CategoryID);
/// \brief Return true if a given diagnostic falls into an ARC diagnostic
/// category.
static bool isARCDiagnostic(unsigned DiagID);
/// \brief Enumeration describing how the emission of a diagnostic should
/// be treated when it occurs during C++ template argument deduction.
enum SFINAEResponse {
/// \brief The diagnostic should not be reported, but it should cause
/// template argument deduction to fail.
/// The vast majority of errors that occur during template argument
/// deduction fall into this category.
/// \brief The diagnostic should be suppressed entirely.
/// Warnings generally fall into this category.
/// \brief The diagnostic should be reported.
/// The diagnostic should be reported. Various fatal errors (e.g.,
/// template instantiation depth exceeded) fall into this category.
/// \brief The diagnostic is an access-control diagnostic, which will be
/// substitution failures in some contexts and reported in others.
/// \brief Determines whether the given built-in diagnostic ID is
/// for an error that is suppressed if it occurs during C++ template
/// argument deduction.
/// When an error is suppressed due to SFINAE, the template argument
/// deduction fails but no diagnostic is emitted. Certain classes of
/// errors, such as those errors that involve C++ access control,
/// are not SFINAE errors.
static SFINAEResponse getDiagnosticSFINAEResponse(unsigned DiagID);
/// \brief Get the set of all diagnostic IDs in the group with the given name.
/// \param[out] Diags - On return, the diagnostics in the group.
/// \returns \c true if the given group is unknown, \c false otherwise.
bool getDiagnosticsInGroup(StringRef Group,
SmallVectorImpl<diag::kind> &Diags) const;
/// \brief Get the set of all diagnostic IDs.
void getAllDiagnostics(SmallVectorImpl<diag::kind> &Diags) const;
/// \brief Get the warning option with the closest edit distance to the given
/// group name.
static StringRef getNearestWarningOption(StringRef Group);
/// \brief Classify the specified diagnostic ID into a Level, consumable by
/// the DiagnosticClient.
/// The classification is based on the way the client configured the
/// DiagnosticsEngine object.
/// \param Loc The source location for which we are interested in finding out
/// the diagnostic state. Can be null in order to query the latest state.
getDiagnosticLevel(unsigned DiagID, SourceLocation Loc,
const DiagnosticsEngine &Diag) const LLVM_READONLY;
/// \brief An internal implementation helper used when \p DiagClass is
/// already known.
getDiagnosticLevel(unsigned DiagID, unsigned DiagClass, SourceLocation Loc,
const DiagnosticsEngine &Diag) const LLVM_READONLY;
/// \brief Used to report a diagnostic that is finally fully formed.
/// \returns \c true if the diagnostic was emitted, \c false if it was
/// suppressed.
bool ProcessDiag(DiagnosticsEngine &Diag) const;
/// \brief Used to emit a diagnostic that is finally fully formed,
/// ignoring suppression.
void EmitDiag(DiagnosticsEngine &Diag, Level DiagLevel) const;
/// \brief Whether the diagnostic may leave the AST in a state where some
/// invariants can break.
bool isUnrecoverable(unsigned DiagID) const;
friend class DiagnosticsEngine;
} // end namespace clang