Viewing file:  Attr.h (7.11 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
//===----- Attr.h --- Helper functions for attribute handling in Sema -----===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// This file provides helpers for Sema functions that handle attributes.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_SEMA_ATTR_H
#define LLVM_CLANG_SEMA_ATTR_H
#include "clang/AST/Attr.h"
#include "clang/AST/Decl.h"
#include "clang/AST/DeclBase.h"
#include "clang/AST/DeclCXX.h"
#include "clang/AST/DeclObjC.h"
#include "clang/AST/Type.h"
#include "clang/Basic/AttributeCommonInfo.h"
#include "clang/Basic/DiagnosticSema.h"
#include "clang/Basic/SourceLocation.h"
#include "clang/Sema/ParsedAttr.h"
#include "clang/Sema/SemaBase.h"
#include "llvm/Support/Casting.h"
namespace clang {
/// isFuncOrMethodForAttrSubject - Return true if the given decl has function
/// type (function or function-typed variable) or an Objective-C
/// method.
inline bool isFuncOrMethodForAttrSubject(const Decl *D) {
return (D->getFunctionType() != nullptr) || llvm::isa<ObjCMethodDecl>(D);
}
/// Return true if the given decl has function type (function or
/// function-typed variable) or an Objective-C method or a block.
inline bool isFunctionOrMethodOrBlockForAttrSubject(const Decl *D) {
return isFuncOrMethodForAttrSubject(D) || llvm::isa<BlockDecl>(D);
}
/// Return true if the given decl has a declarator that should have
/// been processed by Sema::GetTypeForDeclarator.
inline bool hasDeclarator(const Decl *D) {
// In some sense, TypedefDecl really *ought* to be a DeclaratorDecl.
return isa<DeclaratorDecl>(D) || isa<BlockDecl>(D) ||
isa<TypedefNameDecl>(D) || isa<ObjCPropertyDecl>(D);
}
/// hasFunctionProto - Return true if the given decl has a argument
/// information. This decl should have already passed
/// isFuncOrMethodForAttrSubject or isFunctionOrMethodOrBlockForAttrSubject.
inline bool hasFunctionProto(const Decl *D) {
if (const FunctionType *FnTy = D->getFunctionType())
return isa<FunctionProtoType>(FnTy);
return isa<ObjCMethodDecl>(D) || isa<BlockDecl>(D);
}
/// getFunctionOrMethodNumParams - Return number of function or method
/// parameters. It is an error to call this on a K&R function (use
/// hasFunctionProto first).
inline unsigned getFunctionOrMethodNumParams(const Decl *D) {
if (const FunctionType *FnTy = D->getFunctionType())
return cast<FunctionProtoType>(FnTy)->getNumParams();
if (const auto *BD = dyn_cast<BlockDecl>(D))
return BD->getNumParams();
return cast<ObjCMethodDecl>(D)->param_size();
}
inline const ParmVarDecl *getFunctionOrMethodParam(const Decl *D,
unsigned Idx) {
if (const auto *FD = dyn_cast<FunctionDecl>(D))
return FD->getParamDecl(Idx);
if (const auto *MD = dyn_cast<ObjCMethodDecl>(D))
return MD->getParamDecl(Idx);
if (const auto *BD = dyn_cast<BlockDecl>(D))
return BD->getParamDecl(Idx);
return nullptr;
}
inline QualType getFunctionOrMethodParamType(const Decl *D, unsigned Idx) {
if (const FunctionType *FnTy = D->getFunctionType())
return cast<FunctionProtoType>(FnTy)->getParamType(Idx);
if (const auto *BD = dyn_cast<BlockDecl>(D))
return BD->getParamDecl(Idx)->getType();
return cast<ObjCMethodDecl>(D)->parameters()[Idx]->getType();
}
inline SourceRange getFunctionOrMethodParamRange(const Decl *D, unsigned Idx) {
if (auto *PVD = getFunctionOrMethodParam(D, Idx))
return PVD->getSourceRange();
return SourceRange();
}
inline QualType getFunctionOrMethodResultType(const Decl *D) {
if (const FunctionType *FnTy = D->getFunctionType())
return FnTy->getReturnType();
return cast<ObjCMethodDecl>(D)->getReturnType();
}
inline SourceRange getFunctionOrMethodResultSourceRange(const Decl *D) {
if (const auto *FD = dyn_cast<FunctionDecl>(D))
return FD->getReturnTypeSourceRange();
if (const auto *MD = dyn_cast<ObjCMethodDecl>(D))
return MD->getReturnTypeSourceRange();
return SourceRange();
}
inline bool isFunctionOrMethodVariadic(const Decl *D) {
if (const FunctionType *FnTy = D->getFunctionType())
return cast<FunctionProtoType>(FnTy)->isVariadic();
if (const auto *BD = dyn_cast<BlockDecl>(D))
return BD->isVariadic();
return cast<ObjCMethodDecl>(D)->isVariadic();
}
inline bool isInstanceMethod(const Decl *D) {
if (const auto *MethodDecl = dyn_cast<CXXMethodDecl>(D))
return MethodDecl->isInstance();
return false;
}
/// Diagnose mutually exclusive attributes when present on a given
/// declaration. Returns true if diagnosed.
template <typename AttrTy>
bool checkAttrMutualExclusion(SemaBase &S, Decl *D, const ParsedAttr &AL) {
if (const auto *A = D->getAttr<AttrTy>()) {
S.Diag(AL.getLoc(), diag::err_attributes_are_not_compatible)
<< AL << A
<< (AL.isRegularKeywordAttribute() || A->isRegularKeywordAttribute());
S.Diag(A->getLocation(), diag::note_conflicting_attribute);
return true;
}
return false;
}
template <typename AttrTy>
bool checkAttrMutualExclusion(SemaBase &S, Decl *D, const Attr &AL) {
if (const auto *A = D->getAttr<AttrTy>()) {
S.Diag(AL.getLocation(), diag::err_attributes_are_not_compatible)
<< &AL << A
<< (AL.isRegularKeywordAttribute() || A->isRegularKeywordAttribute());
Diag(A->getLocation(), diag::note_conflicting_attribute);
return true;
}
return false;
}
template <typename... DiagnosticArgs>
const SemaBase::SemaDiagnosticBuilder &
appendDiagnostics(const SemaBase::SemaDiagnosticBuilder &Bldr) {
return Bldr;
}
template <typename T, typename... DiagnosticArgs>
const SemaBase::SemaDiagnosticBuilder &
appendDiagnostics(const SemaBase::SemaDiagnosticBuilder &Bldr, T &&ExtraArg,
DiagnosticArgs &&...ExtraArgs) {
return appendDiagnostics(Bldr << std::forward<T>(ExtraArg),
std::forward<DiagnosticArgs>(ExtraArgs)...);
}
/// Applies the given attribute to the Decl without performing any
/// additional semantic checking.
template <typename AttrType>
void handleSimpleAttribute(SemaBase &S, Decl *D,
const AttributeCommonInfo &CI) {
D->addAttr(::new (S.getASTContext()) AttrType(S.getASTContext(), CI));
}
/// Add an attribute @c AttrType to declaration @c D, provided that
/// @c PassesCheck is true.
/// Otherwise, emit diagnostic @c DiagID, passing in all parameters
/// specified in @c ExtraArgs.
template <typename AttrType, typename... DiagnosticArgs>
void handleSimpleAttributeOrDiagnose(SemaBase &S, Decl *D,
const AttributeCommonInfo &CI,
bool PassesCheck, unsigned DiagID,
DiagnosticArgs &&...ExtraArgs) {
if (!PassesCheck) {
SemaBase::SemaDiagnosticBuilder DB = S.Diag(D->getBeginLoc(), DiagID);
appendDiagnostics(DB, std::forward<DiagnosticArgs>(ExtraArgs)...);
return;
}
handleSimpleAttribute<AttrType>(S, D, CI);
}
} // namespace clang
#endif // LLVM_CLANG_SEMA_ATTR_H
|