diff options
Diffstat (limited to 'libstdc++-v3/libsupc++/tinfo.h')
| -rw-r--r-- | libstdc++-v3/libsupc++/tinfo.h | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/libstdc++-v3/libsupc++/tinfo.h b/libstdc++-v3/libsupc++/tinfo.h index b94c4cc09b5..f0c9fbfdf3d 100644 --- a/libstdc++-v3/libsupc++/tinfo.h +++ b/libstdc++-v3/libsupc++/tinfo.h @@ -34,3 +34,155 @@ // Class declarations shared between the typeinfo implementation files. #include <cxxabi.h> + +namespace __cxxabiv1 { + +inline bool __pbase_type_info:: +__pointer_catch (const __pbase_type_info *thrown_type, + void **thr_obj, + unsigned outer) const +{ + return __pointee->__do_catch (thrown_type->__pointee, thr_obj, outer + 2); +} + +namespace { + +using namespace std; +using namespace abi; + +// Initial part of a vtable, this structure is used with offsetof, so we don't +// have to keep alignments consistent manually. +struct vtable_prefix +{ + // Offset to most derived object. + ptrdiff_t whole_object; + + // Additional padding if necessary. +#ifdef _GLIBCXX_VTABLE_PADDING + ptrdiff_t padding1; +#endif + + // Pointer to most derived type_info. + const __class_type_info *whole_type; + + // Additional padding if necessary. +#ifdef _GLIBCXX_VTABLE_PADDING + ptrdiff_t padding2; +#endif + + // What a class's vptr points to. + const void *origin; +}; + +template <typename T> +inline const T * +adjust_pointer (const void *base, ptrdiff_t offset) +{ + return reinterpret_cast <const T *> + (reinterpret_cast <const char *> (base) + offset); +} + +// ADDR is a pointer to an object. Convert it to a pointer to a base, +// using OFFSET. IS_VIRTUAL is true, if we are getting a virtual base. +inline void const * +convert_to_base (void const *addr, bool is_virtual, ptrdiff_t offset) +{ + if (is_virtual) + { + const void *vtable = *static_cast <const void *const *> (addr); + + offset = *adjust_pointer<ptrdiff_t> (vtable, offset); + } + + return adjust_pointer<void> (addr, offset); +} + +// some predicate functions for __class_type_info::__sub_kind +inline bool contained_p (__class_type_info::__sub_kind access_path) +{ + return access_path >= __class_type_info::__contained_mask; +} +inline bool public_p (__class_type_info::__sub_kind access_path) +{ + return access_path & __class_type_info::__contained_public_mask; +} +inline bool virtual_p (__class_type_info::__sub_kind access_path) +{ + return (access_path & __class_type_info::__contained_virtual_mask); +} +inline bool contained_public_p (__class_type_info::__sub_kind access_path) +{ + return ((access_path & __class_type_info::__contained_public) + == __class_type_info::__contained_public); +} +inline bool contained_nonpublic_p (__class_type_info::__sub_kind access_path) +{ + return ((access_path & __class_type_info::__contained_public) + == __class_type_info::__contained_mask); +} +inline bool contained_nonvirtual_p (__class_type_info::__sub_kind access_path) +{ + return ((access_path & (__class_type_info::__contained_mask + | __class_type_info::__contained_virtual_mask)) + == __class_type_info::__contained_mask); +} + +static const __class_type_info *const nonvirtual_base_type = + static_cast <const __class_type_info *> (0) + 1; + +} // namespace + +// __upcast_result is used to hold information during traversal of a class +// hierarchy when catch matching. +struct __class_type_info::__upcast_result +{ + const void *dst_ptr; // pointer to caught object + __sub_kind part2dst; // path from current base to target + int src_details; // hints about the source type hierarchy + const __class_type_info *base_type; // where we found the target, + // if in vbase the __class_type_info of vbase + // if a non-virtual base then 1 + // else NULL + __upcast_result (int d) + :dst_ptr (NULL), part2dst (__unknown), src_details (d), base_type (NULL) + {} +}; + +// __dyncast_result is used to hold information during traversal of a class +// hierarchy when dynamic casting. +struct __class_type_info::__dyncast_result +{ + const void *dst_ptr; // pointer to target object or NULL + __sub_kind whole2dst; // path from most derived object to target + __sub_kind whole2src; // path from most derived object to sub object + __sub_kind dst2src; // path from target to sub object + int whole_details; // details of the whole class hierarchy + + __dyncast_result (int details_ = __vmi_class_type_info::__flags_unknown_mask) + :dst_ptr (NULL), whole2dst (__unknown), + whole2src (__unknown), dst2src (__unknown), + whole_details (details_) + {} + +protected: + __dyncast_result(const __dyncast_result&); + + __dyncast_result& + operator=(const __dyncast_result&); +}; + +inline __class_type_info::__sub_kind __class_type_info:: +__find_public_src (ptrdiff_t src2dst, + const void *obj_ptr, + const __class_type_info *src_type, + const void *src_ptr) const +{ + if (src2dst >= 0) + return adjust_pointer <void> (obj_ptr, src2dst) == src_ptr + ? __contained_public : __not_contained; + if (src2dst == -2) + return __not_contained; + return __do_find_public_src (src2dst, obj_ptr, src_type, src_ptr); +} + +} |
