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//===- DelayedDiagnostic.h - Delayed declarator diagnostics -----*- 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

//

//===----------------------------------------------------------------------===//

//

/// \file

/// Defines the classes clang::DelayedDiagnostic and

/// clang::AccessedEntity.

///

/// DelayedDiangostic is used to record diagnostics that are being

/// conditionally produced during declarator parsing.  Certain kinds of

/// diagnostics -- notably deprecation and access control -- are suppressed

/// based on semantic properties of the parsed declaration that aren't known

/// until it is fully parsed.

//

//===----------------------------------------------------------------------===//

#ifndef LLVM_CLANG_SEMA_DELAYEDDIAGNOSTIC_H

#define LLVM_CLANG_SEMA_DELAYEDDIAGNOSTIC_H

#include "clang/AST/DeclAccessPair.h"

#include "clang/AST/DeclBase.h"

#include "clang/AST/DeclCXX.h"

#include "clang/AST/Type.h"

#include "clang/Basic/LLVM.h"

#include "clang/Basic/PartialDiagnostic.h"

#include "clang/Basic/SourceLocation.h"

#include "clang/Basic/Specifiers.h"

#include "clang/Sema/Sema.h"

#include "llvm/ADT/ArrayRef.h"

#include "llvm/ADT/SmallVector.h"

#include "llvm/ADT/StringRef.h"

#include "llvm/Support/Casting.h"

#include <cassert>

#include <cstddef>

#include <utility>

namespace clang {

class ObjCInterfaceDecl;

class ObjCPropertyDecl;

namespace sema {

/// A declaration being accessed, together with information about how

/// it was accessed.

class AccessedEntity {

public:

  /// A member declaration found through lookup.  The target is the

  /// member.

  enum MemberNonce { Member };

  /// A hierarchy (base-to-derived or derived-to-base) conversion.

  /// The target is the base class.

  enum BaseNonce { Base };

  AccessedEntity(PartialDiagnostic::DiagStorageAllocator &Allocator,

                 MemberNonce _, CXXRecordDecl *NamingClass,

                 DeclAccessPair FoundDecl, QualType BaseObjectType)

      : Access(FoundDecl.getAccess()), IsMember(true),

        Target(FoundDecl.getDecl()), NamingClass(NamingClass),

        BaseObjectType(BaseObjectType), Diag(0, Allocator) {}

  AccessedEntity(PartialDiagnostic::DiagStorageAllocator &Allocator,

                 BaseNonce _, CXXRecordDecl *BaseClass,

                 CXXRecordDecl *DerivedClass, AccessSpecifier Access)

      : Access(Access), IsMember(false), Target(BaseClass),

        NamingClass(DerivedClass), Diag(0, Allocator) {}

  bool isMemberAccess() const { return IsMember; }

  bool isQuiet() const { return Diag.getDiagID() == 0; }

  AccessSpecifier getAccess() const { return AccessSpecifier(Access); }

  // These apply to member decls...

  NamedDecl *getTargetDecl() const { return Target; }

  CXXRecordDecl *getNamingClass() const { return NamingClass; }

  // ...and these apply to hierarchy conversions.

  CXXRecordDecl *getBaseClass() const {

    assert(!IsMember); return cast<CXXRecordDecl>(Target);

  }

  CXXRecordDecl *getDerivedClass() const { return NamingClass; }

  /// Retrieves the base object type, important when accessing

  /// an instance member.

  QualType getBaseObjectType() const { return BaseObjectType; }

  /// Sets a diagnostic to be performed.  The diagnostic is given

  /// four (additional) arguments:

  ///   %0 - 0 if the entity was private, 1 if protected

  ///   %1 - the DeclarationName of the entity

  ///   %2 - the TypeDecl type of the naming class

  ///   %3 - the TypeDecl type of the declaring class

  void setDiag(const PartialDiagnostic &PDiag) {

    assert(isQuiet() && "partial diagnostic already defined");

    Diag = PDiag;

  }

  PartialDiagnostic &setDiag(unsigned DiagID) {

    assert(isQuiet() && "partial diagnostic already defined");

    assert(DiagID && "creating null diagnostic");

    Diag.Reset(DiagID);

    return Diag;

  }

  const PartialDiagnostic &getDiag() const {

    return Diag;

  }

private:

  unsigned Access : 2;

  unsigned IsMember : 1;

  NamedDecl *Target;

  CXXRecordDecl *NamingClass;

  QualType BaseObjectType;

  PartialDiagnostic Diag;

};

/// A diagnostic message which has been conditionally emitted pending

/// the complete parsing of the current declaration.

class DelayedDiagnostic {

public:

  enum DDKind : unsigned char { Availability, Access, ForbiddenType };

  DDKind Kind;

  bool Triggered;

  SourceLocation Loc;

  void Destroy();

  static DelayedDiagnostic makeAvailability(AvailabilityResult AR,

                                            ArrayRef<SourceLocation> Locs,

                                            const NamedDecl *ReferringDecl,

                                            const NamedDecl *OffendingDecl,

                                            const ObjCInterfaceDecl *UnknownObjCClass,

                                            const ObjCPropertyDecl  *ObjCProperty,

                                            StringRef Msg,

                                            bool ObjCPropertyAccess);

  static DelayedDiagnostic makeAccess(SourceLocation Loc,

                                      const AccessedEntity &Entity) {

    DelayedDiagnostic DD;

    DD.Kind = Access;

    DD.Triggered = false;

    DD.Loc = Loc;

    new (&DD.getAccessData()) AccessedEntity(Entity);

    return DD;

  }

  static DelayedDiagnostic makeForbiddenType(SourceLocation loc,

                                             unsigned diagnostic,

                                             QualType type,

                                             unsigned argument) {

    DelayedDiagnostic DD;

    DD.Kind = ForbiddenType;

    DD.Triggered = false;

    DD.Loc = loc;

    DD.ForbiddenTypeData.Diagnostic = diagnostic;

    DD.ForbiddenTypeData.OperandType = type.getAsOpaquePtr();

    DD.ForbiddenTypeData.Argument = argument;

    return DD;

  }

  AccessedEntity &getAccessData() {

    assert(Kind == Access && "Not an access diagnostic.");

    return *reinterpret_cast<AccessedEntity*>(AccessData);

  }

  const AccessedEntity &getAccessData() const {

    assert(Kind == Access && "Not an access diagnostic.");

    return *reinterpret_cast<const AccessedEntity*>(AccessData);

  }

  const NamedDecl *getAvailabilityReferringDecl() const {

    assert(Kind == Availability && "Not an availability diagnostic.");

    return AvailabilityData.ReferringDecl;

  }

  const NamedDecl *getAvailabilityOffendingDecl() const {

    return AvailabilityData.OffendingDecl;

  }

  StringRef getAvailabilityMessage() const {

    assert(Kind == Availability && "Not an availability diagnostic.");

    return StringRef(AvailabilityData.Message, AvailabilityData.MessageLen);

  }

  ArrayRef<SourceLocation> getAvailabilitySelectorLocs() const {

    assert(Kind == Availability && "Not an availability diagnostic.");

    return llvm::ArrayRef(AvailabilityData.SelectorLocs,

                          AvailabilityData.NumSelectorLocs);

  }

  AvailabilityResult getAvailabilityResult() const {

    assert(Kind == Availability && "Not an availability diagnostic.");

    return AvailabilityData.AR;

  }

  /// The diagnostic ID to emit.  Used like so:

  ///   Diag(diag.Loc, diag.getForbiddenTypeDiagnostic())

  ///     << diag.getForbiddenTypeOperand()

  ///     << diag.getForbiddenTypeArgument();

  unsigned getForbiddenTypeDiagnostic() const {

    assert(Kind == ForbiddenType && "not a forbidden-type diagnostic");

    return ForbiddenTypeData.Diagnostic;

  }

  unsigned getForbiddenTypeArgument() const {

    assert(Kind == ForbiddenType && "not a forbidden-type diagnostic");

    return ForbiddenTypeData.Argument;

  }

  QualType getForbiddenTypeOperand() const {

    assert(Kind == ForbiddenType && "not a forbidden-type diagnostic");

    return QualType::getFromOpaquePtr(ForbiddenTypeData.OperandType);

  }

  const ObjCInterfaceDecl *getUnknownObjCClass() const {

    return AvailabilityData.UnknownObjCClass;

  }

  const ObjCPropertyDecl *getObjCProperty() const {

    return AvailabilityData.ObjCProperty;

  }

  bool getObjCPropertyAccess() const {

    return AvailabilityData.ObjCPropertyAccess;

  }

private:

  struct AD {

    const NamedDecl *ReferringDecl;

    const NamedDecl *OffendingDecl;

    const ObjCInterfaceDecl *UnknownObjCClass;

    const ObjCPropertyDecl  *ObjCProperty;

    const char *Message;

    size_t MessageLen;

    SourceLocation *SelectorLocs;

    size_t NumSelectorLocs;

    AvailabilityResult AR;

    bool ObjCPropertyAccess;

  };

  struct FTD {

    unsigned Diagnostic;

    unsigned Argument;

    void *OperandType;

  };

  union {

    struct AD AvailabilityData;

    struct FTD ForbiddenTypeData;

    /// Access control.

    char AccessData[sizeof(AccessedEntity)];

  };

};

/// A collection of diagnostics which were delayed.

class DelayedDiagnosticPool {

  const DelayedDiagnosticPool *Parent;

  SmallVector<DelayedDiagnostic, 4> Diagnostics;

public:

  DelayedDiagnosticPool(const DelayedDiagnosticPool *parent) : Parent(parent) {}

  DelayedDiagnosticPool(const DelayedDiagnosticPool &) = delete;

  DelayedDiagnosticPool &operator=(const DelayedDiagnosticPool &) = delete;

  DelayedDiagnosticPool(DelayedDiagnosticPool &&Other)

      : Parent(Other.Parent), Diagnostics(std::move(Other.Diagnostics)) {

    Other.Diagnostics.clear();

  }

  DelayedDiagnosticPool &operator=(DelayedDiagnosticPool &&Other) {

    Parent = Other.Parent;

    Diagnostics = std::move(Other.Diagnostics);

    Other.Diagnostics.clear();

    return *this;

  }

  ~DelayedDiagnosticPool() {

    for (SmallVectorImpl<DelayedDiagnostic>::iterator

           i = Diagnostics.begin(), e = Diagnostics.end(); i != e; ++i)

      i->Destroy();

  }

  const DelayedDiagnosticPool *getParent() const { return Parent; }

  /// Does this pool, or any of its ancestors, contain any diagnostics?

  bool empty() const {

    return (Diagnostics.empty() && (!Parent || Parent->empty()));

  }

  /// Add a diagnostic to this pool.

  void add(const DelayedDiagnostic &diag) {

    Diagnostics.push_back(diag);

  }

  /// Steal the diagnostics from the given pool.

  void steal(DelayedDiagnosticPool &pool) {

    if (pool.Diagnostics.empty()) return;

    if (Diagnostics.empty()) {

      Diagnostics = std::move(pool.Diagnostics);

    } else {

      Diagnostics.append(pool.pool_begin(), pool.pool_end());

    }

    pool.Diagnostics.clear();

  }

  using pool_iterator = SmallVectorImpl<DelayedDiagnostic>::const_iterator;

  pool_iterator pool_begin() const { return Diagnostics.begin(); }

  pool_iterator pool_end() const { return Diagnostics.end(); }

  bool pool_empty() const { return Diagnostics.empty(); }

};

} // namespace clang

/// Add a diagnostic to the current delay pool.

inline void Sema::DelayedDiagnostics::add(const sema::DelayedDiagnostic &diag) {

  assert(shouldDelayDiagnostics() && "trying to delay without pool");

  CurPool->add(diag);

}

} // namespace clang

#endif // LLVM_CLANG_SEMA_DELAYEDDIAGNOSTIC_H