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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:
LLVM_PREFERRED_TYPE(AccessSpecifier)
unsigned Access : 2;
LLVM_PREFERRED_TYPE(bool)
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
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