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Diffstat (limited to 'include/clang/AST/DeclAccessPair.h')
-rw-r--r-- | include/clang/AST/DeclAccessPair.h | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/include/clang/AST/DeclAccessPair.h b/include/clang/AST/DeclAccessPair.h new file mode 100644 index 0000000..7ecd8f8 --- /dev/null +++ b/include/clang/AST/DeclAccessPair.h @@ -0,0 +1,72 @@ +//===--- DeclAccessPair.h - A decl bundled with its path access -*- C++ -*-===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This file defines the DeclAccessPair class, which provides an +// efficient representation of a pair of a NamedDecl* and an +// AccessSpecifier. Generally the access specifier gives the +// natural access of a declaration when named in a class, as +// defined in C++ [class.access.base]p1. +// +//===----------------------------------------------------------------------===// + +#ifndef LLVM_CLANG_AST_DECLACCESSPAIR_H +#define LLVM_CLANG_AST_DECLACCESSPAIR_H + +#include "clang/Basic/Specifiers.h" + +namespace clang { + +class NamedDecl; + +/// A POD class for pairing a NamedDecl* with an access specifier. +/// Can be put into unions. +class DeclAccessPair { + NamedDecl *Ptr; // we'd use llvm::PointerUnion, but it isn't trivial + + enum { Mask = 0x3 }; + +public: + static DeclAccessPair make(NamedDecl *D, AccessSpecifier AS) { + DeclAccessPair p; + p.set(D, AS); + return p; + } + + NamedDecl *getDecl() const { + return (NamedDecl*) (~Mask & (uintptr_t) Ptr); + } + AccessSpecifier getAccess() const { + return AccessSpecifier(Mask & (uintptr_t) Ptr); + } + + void setDecl(NamedDecl *D) { + set(D, getAccess()); + } + void setAccess(AccessSpecifier AS) { + set(getDecl(), AS); + } + void set(NamedDecl *D, AccessSpecifier AS) { + Ptr = reinterpret_cast<NamedDecl*>(uintptr_t(AS) | + reinterpret_cast<uintptr_t>(D)); + } + + operator NamedDecl*() const { return getDecl(); } + NamedDecl *operator->() const { return getDecl(); } +}; +} + +// Take a moment to tell SmallVector that DeclAccessPair is POD. +namespace llvm { +template<typename> struct isPodLike; +template<> struct isPodLike<clang::DeclAccessPair> { + static const bool value = true; +}; +} + +#endif |