mirror of git://gcc.gnu.org/git/gcc.git
706 lines
21 KiB
C++
706 lines
21 KiB
C++
// ABI Support -*- C++ -*-
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// Copyright (C) 2000-2017 Free Software Foundation, Inc.
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//
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// This file is part of GCC.
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//
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// GCC is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 3, or (at your option)
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// any later version.
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//
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// GCC is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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// Written by Nathan Sidwell, Codesourcery LLC, <nathan@codesourcery.com>
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/* This file declares the new abi entry points into the runtime. It is not
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normally necessary for user programs to include this header, or use the
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entry points directly. However, this header is available should that be
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needed.
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Some of the entry points are intended for both C and C++, thus this header
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is includable from both C and C++. Though the C++ specific parts are not
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available in C, naturally enough. */
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/** @file cxxabi.h
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* The header provides an interface to the C++ ABI.
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*/
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#ifndef _CXXABI_H
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#define _CXXABI_H 1
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#pragma GCC system_header
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#pragma GCC visibility push(default)
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#include <stddef.h>
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#include <bits/c++config.h>
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#include <bits/cxxabi_tweaks.h>
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#include <bits/cxxabi_forced.h>
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#include <bits/cxxabi_init_exception.h>
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#ifdef __cplusplus
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namespace __cxxabiv1
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{
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extern "C"
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{
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#endif
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typedef __cxa_cdtor_return_type (*__cxa_cdtor_type)(void *);
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// Allocate array.
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void*
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__cxa_vec_new(size_t __element_count, size_t __element_size,
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size_t __padding_size, __cxa_cdtor_type __constructor,
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__cxa_cdtor_type __destructor);
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void*
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__cxa_vec_new2(size_t __element_count, size_t __element_size,
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size_t __padding_size, __cxa_cdtor_type __constructor,
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__cxa_cdtor_type __destructor, void *(*__alloc) (size_t),
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void (*__dealloc) (void*));
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void*
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__cxa_vec_new3(size_t __element_count, size_t __element_size,
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size_t __padding_size, __cxa_cdtor_type __constructor,
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__cxa_cdtor_type __destructor, void *(*__alloc) (size_t),
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void (*__dealloc) (void*, size_t));
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// Construct array.
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__cxa_vec_ctor_return_type
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__cxa_vec_ctor(void* __array_address, size_t __element_count,
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size_t __element_size, __cxa_cdtor_type __constructor,
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__cxa_cdtor_type __destructor);
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__cxa_vec_ctor_return_type
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__cxa_vec_cctor(void* __dest_array, void* __src_array,
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size_t __element_count, size_t __element_size,
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__cxa_cdtor_return_type (*__constructor) (void*, void*),
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__cxa_cdtor_type __destructor);
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// Destruct array.
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void
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__cxa_vec_dtor(void* __array_address, size_t __element_count,
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size_t __element_size, __cxa_cdtor_type __destructor);
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void
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__cxa_vec_cleanup(void* __array_address, size_t __element_count, size_t __s,
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__cxa_cdtor_type __destructor) _GLIBCXX_NOTHROW;
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// Destruct and release array.
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void
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__cxa_vec_delete(void* __array_address, size_t __element_size,
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size_t __padding_size, __cxa_cdtor_type __destructor);
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void
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__cxa_vec_delete2(void* __array_address, size_t __element_size,
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size_t __padding_size, __cxa_cdtor_type __destructor,
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void (*__dealloc) (void*));
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void
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__cxa_vec_delete3(void* __array_address, size_t __element_size,
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size_t __padding_size, __cxa_cdtor_type __destructor,
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void (*__dealloc) (void*, size_t));
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int
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__cxa_guard_acquire(__guard*);
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void
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__cxa_guard_release(__guard*) _GLIBCXX_NOTHROW;
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void
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__cxa_guard_abort(__guard*) _GLIBCXX_NOTHROW;
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// DSO destruction.
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int
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__cxa_atexit(void (*)(void*), void*, void*) _GLIBCXX_NOTHROW;
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int
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__cxa_finalize(void*);
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// TLS destruction.
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int
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__cxa_thread_atexit(void (*)(void*), void*, void *) _GLIBCXX_NOTHROW;
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// Pure virtual functions.
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void
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__cxa_pure_virtual(void) __attribute__ ((__noreturn__));
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void
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__cxa_deleted_virtual(void) __attribute__ ((__noreturn__));
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// Exception handling auxiliary.
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void
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__cxa_bad_cast() __attribute__((__noreturn__));
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void
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__cxa_bad_typeid() __attribute__((__noreturn__));
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void
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__cxa_throw_bad_array_new_length() __attribute__((__noreturn__));
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/**
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* @brief Demangling routine.
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* ABI-mandated entry point in the C++ runtime library for demangling.
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*
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* @param __mangled_name A NUL-terminated character string
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* containing the name to be demangled.
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*
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* @param __output_buffer A region of memory, allocated with
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* malloc, of @a *__length bytes, into which the demangled name is
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* stored. If @a __output_buffer is not long enough, it is
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* expanded using realloc. @a __output_buffer may instead be NULL;
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* in that case, the demangled name is placed in a region of memory
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* allocated with malloc.
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*
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* @param __length If @a __length is non-NULL, the length of the
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* buffer containing the demangled name is placed in @a *__length.
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*
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* @param __status @a *__status is set to one of the following values:
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* 0: The demangling operation succeeded.
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* -1: A memory allocation failure occurred.
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* -2: @a mangled_name is not a valid name under the C++ ABI mangling rules.
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* -3: One of the arguments is invalid.
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*
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* @return A pointer to the start of the NUL-terminated demangled
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* name, or NULL if the demangling fails. The caller is
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* responsible for deallocating this memory using @c free.
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*
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* The demangling is performed using the C++ ABI mangling rules,
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* with GNU extensions. For example, this function is used in
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* __gnu_cxx::__verbose_terminate_handler.
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*
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* See http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt12ch39.html
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* for other examples of use.
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*
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* @note The same demangling functionality is available via
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* libiberty (@c <libiberty/demangle.h> and @c libiberty.a) in GCC
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* 3.1 and later, but that requires explicit installation (@c
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* --enable-install-libiberty) and uses a different API, although
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* the ABI is unchanged.
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*/
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char*
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__cxa_demangle(const char* __mangled_name, char* __output_buffer,
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size_t* __length, int* __status);
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#ifdef __cplusplus
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}
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} // namespace __cxxabiv1
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#endif
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#ifdef __cplusplus
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#include <typeinfo>
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namespace __cxxabiv1
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{
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// Type information for int, float etc.
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class __fundamental_type_info : public std::type_info
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{
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public:
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explicit
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__fundamental_type_info(const char* __n) : std::type_info(__n) { }
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virtual
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~__fundamental_type_info();
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};
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// Type information for array objects.
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class __array_type_info : public std::type_info
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{
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public:
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explicit
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__array_type_info(const char* __n) : std::type_info(__n) { }
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virtual
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~__array_type_info();
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};
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// Type information for functions (both member and non-member).
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class __function_type_info : public std::type_info
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{
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public:
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explicit
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__function_type_info(const char* __n) : std::type_info(__n) { }
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virtual
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~__function_type_info();
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protected:
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// Implementation defined member function.
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virtual bool
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__is_function_p() const;
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};
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// Type information for enumerations.
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class __enum_type_info : public std::type_info
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{
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public:
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explicit
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__enum_type_info(const char* __n) : std::type_info(__n) { }
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virtual
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~__enum_type_info();
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};
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// Common type information for simple pointers and pointers to member.
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class __pbase_type_info : public std::type_info
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{
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public:
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unsigned int __flags; // Qualification of the target object.
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const std::type_info* __pointee; // Type of pointed to object.
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explicit
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__pbase_type_info(const char* __n, int __quals,
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const std::type_info* __type)
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: std::type_info(__n), __flags(__quals), __pointee(__type)
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{ }
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virtual
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~__pbase_type_info();
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// Implementation defined type.
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enum __masks
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{
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__const_mask = 0x1,
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__volatile_mask = 0x2,
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__restrict_mask = 0x4,
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__incomplete_mask = 0x8,
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__incomplete_class_mask = 0x10,
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__transaction_safe_mask = 0x20,
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__noexcept_mask = 0x40
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};
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protected:
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__pbase_type_info(const __pbase_type_info&);
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__pbase_type_info&
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operator=(const __pbase_type_info&);
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// Implementation defined member functions.
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virtual bool
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__do_catch(const std::type_info* __thr_type, void** __thr_obj,
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unsigned int __outer) const;
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inline virtual bool
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__pointer_catch(const __pbase_type_info* __thr_type, void** __thr_obj,
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unsigned __outer) const;
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};
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inline bool __pbase_type_info::
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__pointer_catch (const __pbase_type_info *thrown_type,
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void **thr_obj,
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unsigned outer) const
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{
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return __pointee->__do_catch (thrown_type->__pointee, thr_obj, outer + 2);
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}
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// Type information for simple pointers.
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class __pointer_type_info : public __pbase_type_info
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{
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public:
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explicit
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__pointer_type_info(const char* __n, int __quals,
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const std::type_info* __type)
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: __pbase_type_info (__n, __quals, __type) { }
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virtual
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~__pointer_type_info();
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protected:
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// Implementation defined member functions.
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virtual bool
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__is_pointer_p() const;
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virtual bool
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__pointer_catch(const __pbase_type_info* __thr_type, void** __thr_obj,
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unsigned __outer) const;
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};
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class __class_type_info;
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// Type information for a pointer to member variable.
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class __pointer_to_member_type_info : public __pbase_type_info
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{
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public:
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__class_type_info* __context; // Class of the member.
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explicit
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__pointer_to_member_type_info(const char* __n, int __quals,
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const std::type_info* __type,
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__class_type_info* __klass)
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: __pbase_type_info(__n, __quals, __type), __context(__klass) { }
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virtual
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~__pointer_to_member_type_info();
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protected:
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__pointer_to_member_type_info(const __pointer_to_member_type_info&);
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__pointer_to_member_type_info&
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operator=(const __pointer_to_member_type_info&);
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// Implementation defined member function.
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virtual bool
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__pointer_catch(const __pbase_type_info* __thr_type, void** __thr_obj,
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unsigned __outer) const;
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};
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// Helper class for __vmi_class_type.
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class __base_class_type_info
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{
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public:
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const __class_type_info* __base_type; // Base class type.
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#ifdef _GLIBCXX_LLP64
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long long __offset_flags; // Offset and info.
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#else
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long __offset_flags; // Offset and info.
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#endif
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enum __offset_flags_masks
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{
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__virtual_mask = 0x1,
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__public_mask = 0x2,
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__hwm_bit = 2,
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__offset_shift = 8 // Bits to shift offset.
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};
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// Implementation defined member functions.
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bool
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__is_virtual_p() const
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{ return __offset_flags & __virtual_mask; }
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bool
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__is_public_p() const
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{ return __offset_flags & __public_mask; }
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ptrdiff_t
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__offset() const
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{
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// This shift, being of a signed type, is implementation
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// defined. GCC implements such shifts as arithmetic, which is
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// what we want.
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return static_cast<ptrdiff_t>(__offset_flags) >> __offset_shift;
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}
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};
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// Type information for a class.
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class __class_type_info : public std::type_info
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{
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public:
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explicit
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__class_type_info (const char *__n) : type_info(__n) { }
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virtual
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~__class_type_info ();
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// Implementation defined types.
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// The type sub_kind tells us about how a base object is contained
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// within a derived object. We often do this lazily, hence the
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// UNKNOWN value. At other times we may use NOT_CONTAINED to mean
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// not publicly contained.
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enum __sub_kind
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{
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// We have no idea.
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__unknown = 0,
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// Not contained within us (in some circumstances this might
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// mean not contained publicly)
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__not_contained,
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// Contained ambiguously.
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__contained_ambig,
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// Via a virtual path.
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__contained_virtual_mask = __base_class_type_info::__virtual_mask,
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// Via a public path.
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__contained_public_mask = __base_class_type_info::__public_mask,
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// Contained within us.
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__contained_mask = 1 << __base_class_type_info::__hwm_bit,
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__contained_private = __contained_mask,
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__contained_public = __contained_mask | __contained_public_mask
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};
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struct __upcast_result;
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struct __dyncast_result;
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protected:
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// Implementation defined member functions.
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virtual bool
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__do_upcast(const __class_type_info* __dst_type, void**__obj_ptr) const;
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virtual bool
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__do_catch(const type_info* __thr_type, void** __thr_obj,
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unsigned __outer) const;
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public:
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// Helper for upcast. See if DST is us, or one of our bases.
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// Return false if not found, true if found.
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virtual bool
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__do_upcast(const __class_type_info* __dst, const void* __obj,
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__upcast_result& __restrict __result) const;
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// Indicate whether SRC_PTR of type SRC_TYPE is contained publicly
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// within OBJ_PTR. OBJ_PTR points to a base object of our type,
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// which is the destination type. SRC2DST indicates how SRC
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// objects might be contained within this type. If SRC_PTR is one
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// of our SRC_TYPE bases, indicate the virtuality. Returns
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// not_contained for non containment or private containment.
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inline __sub_kind
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__find_public_src(ptrdiff_t __src2dst, const void* __obj_ptr,
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const __class_type_info* __src_type,
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const void* __src_ptr) const;
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// Helper for dynamic cast. ACCESS_PATH gives the access from the
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// most derived object to this base. DST_TYPE indicates the
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// desired type we want. OBJ_PTR points to a base of our type
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// within the complete object. SRC_TYPE indicates the static type
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// started from and SRC_PTR points to that base within the most
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// derived object. Fill in RESULT with what we find. Return true
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// if we have located an ambiguous match.
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virtual bool
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__do_dyncast(ptrdiff_t __src2dst, __sub_kind __access_path,
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const __class_type_info* __dst_type, const void* __obj_ptr,
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const __class_type_info* __src_type, const void* __src_ptr,
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__dyncast_result& __result) const;
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// Helper for find_public_subobj. SRC2DST indicates how SRC_TYPE
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// bases are inherited by the type started from -- which is not
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// necessarily the current type. The current type will be a base
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// of the destination type. OBJ_PTR points to the current base.
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virtual __sub_kind
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__do_find_public_src(ptrdiff_t __src2dst, const void* __obj_ptr,
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const __class_type_info* __src_type,
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const void* __src_ptr) const;
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};
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// Type information for a class with a single non-virtual base.
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class __si_class_type_info : public __class_type_info
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{
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public:
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const __class_type_info* __base_type;
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explicit
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__si_class_type_info(const char *__n, const __class_type_info *__base)
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: __class_type_info(__n), __base_type(__base) { }
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virtual
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~__si_class_type_info();
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protected:
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__si_class_type_info(const __si_class_type_info&);
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__si_class_type_info&
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operator=(const __si_class_type_info&);
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// Implementation defined member functions.
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virtual bool
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__do_dyncast(ptrdiff_t __src2dst, __sub_kind __access_path,
|
|
const __class_type_info* __dst_type, const void* __obj_ptr,
|
|
const __class_type_info* __src_type, const void* __src_ptr,
|
|
__dyncast_result& __result) const;
|
|
|
|
virtual __sub_kind
|
|
__do_find_public_src(ptrdiff_t __src2dst, const void* __obj_ptr,
|
|
const __class_type_info* __src_type,
|
|
const void* __sub_ptr) const;
|
|
|
|
virtual bool
|
|
__do_upcast(const __class_type_info*__dst, const void*__obj,
|
|
__upcast_result& __restrict __result) const;
|
|
};
|
|
|
|
// Type information for a class with multiple and/or virtual bases.
|
|
class __vmi_class_type_info : public __class_type_info
|
|
{
|
|
public:
|
|
unsigned int __flags; // Details about the class hierarchy.
|
|
unsigned int __base_count; // Number of direct bases.
|
|
|
|
// The array of bases uses the trailing array struct hack so this
|
|
// class is not constructable with a normal constructor. It is
|
|
// internally generated by the compiler.
|
|
__base_class_type_info __base_info[1]; // Array of bases.
|
|
|
|
explicit
|
|
__vmi_class_type_info(const char* __n, int ___flags)
|
|
: __class_type_info(__n), __flags(___flags), __base_count(0) { }
|
|
|
|
virtual
|
|
~__vmi_class_type_info();
|
|
|
|
// Implementation defined types.
|
|
enum __flags_masks
|
|
{
|
|
__non_diamond_repeat_mask = 0x1, // Distinct instance of repeated base.
|
|
__diamond_shaped_mask = 0x2, // Diamond shaped multiple inheritance.
|
|
__flags_unknown_mask = 0x10
|
|
};
|
|
|
|
protected:
|
|
// Implementation defined member functions.
|
|
virtual bool
|
|
__do_dyncast(ptrdiff_t __src2dst, __sub_kind __access_path,
|
|
const __class_type_info* __dst_type, const void* __obj_ptr,
|
|
const __class_type_info* __src_type, const void* __src_ptr,
|
|
__dyncast_result& __result) const;
|
|
|
|
virtual __sub_kind
|
|
__do_find_public_src(ptrdiff_t __src2dst, const void* __obj_ptr,
|
|
const __class_type_info* __src_type,
|
|
const void* __src_ptr) const;
|
|
|
|
virtual bool
|
|
__do_upcast(const __class_type_info* __dst, const void* __obj,
|
|
__upcast_result& __restrict __result) const;
|
|
};
|
|
|
|
// Exception handling forward declarations.
|
|
struct __cxa_exception;
|
|
struct __cxa_refcounted_exception;
|
|
struct __cxa_dependent_exception;
|
|
struct __cxa_eh_globals;
|
|
|
|
extern "C"
|
|
{
|
|
// Dynamic cast runtime.
|
|
|
|
// src2dst has the following possible values
|
|
// >-1: src_type is a unique public non-virtual base of dst_type
|
|
// dst_ptr + src2dst == src_ptr
|
|
// -1: unspecified relationship
|
|
// -2: src_type is not a public base of dst_type
|
|
// -3: src_type is a multiple public non-virtual base of dst_type
|
|
void*
|
|
__dynamic_cast(const void* __src_ptr, // Starting object.
|
|
const __class_type_info* __src_type, // Static type of object.
|
|
const __class_type_info* __dst_type, // Desired target type.
|
|
ptrdiff_t __src2dst); // How src and dst are related.
|
|
|
|
|
|
// Exception handling runtime.
|
|
|
|
// The __cxa_eh_globals for the current thread can be obtained by using
|
|
// either of the following functions. The "fast" version assumes at least
|
|
// one prior call of __cxa_get_globals has been made from the current
|
|
// thread, so no initialization is necessary.
|
|
__cxa_eh_globals*
|
|
__cxa_get_globals() _GLIBCXX_NOTHROW __attribute__ ((__const__));
|
|
|
|
__cxa_eh_globals*
|
|
__cxa_get_globals_fast() _GLIBCXX_NOTHROW __attribute__ ((__const__));
|
|
|
|
// Free the space allocated for the primary exception.
|
|
void
|
|
__cxa_free_exception(void*) _GLIBCXX_NOTHROW;
|
|
|
|
// Throw the exception.
|
|
void
|
|
__cxa_throw(void*, std::type_info*, void (_GLIBCXX_CDTOR_CALLABI *) (void *))
|
|
__attribute__((__noreturn__));
|
|
|
|
// Used to implement exception handlers.
|
|
void*
|
|
__cxa_get_exception_ptr(void*) _GLIBCXX_NOTHROW __attribute__ ((__pure__));
|
|
|
|
void*
|
|
__cxa_begin_catch(void*) _GLIBCXX_NOTHROW;
|
|
|
|
void
|
|
__cxa_end_catch();
|
|
|
|
void
|
|
__cxa_rethrow() __attribute__((__noreturn__));
|
|
|
|
// Returns the type_info for the currently handled exception [15.3/8], or
|
|
// null if there is none.
|
|
std::type_info*
|
|
__cxa_current_exception_type() _GLIBCXX_NOTHROW __attribute__ ((__pure__));
|
|
|
|
// GNU Extensions.
|
|
|
|
// Allocate memory for a dependent exception.
|
|
__cxa_dependent_exception*
|
|
__cxa_allocate_dependent_exception() _GLIBCXX_NOTHROW;
|
|
|
|
// Free the space allocated for the dependent exception.
|
|
void
|
|
__cxa_free_dependent_exception(__cxa_dependent_exception*) _GLIBCXX_NOTHROW;
|
|
|
|
} // extern "C"
|
|
|
|
// A magic placeholder class that can be caught by reference
|
|
// to recognize foreign exceptions.
|
|
class __foreign_exception
|
|
{
|
|
virtual ~__foreign_exception() throw();
|
|
virtual void __pure_dummy() = 0; // prevent catch by value
|
|
};
|
|
|
|
} // namespace __cxxabiv1
|
|
|
|
/** @namespace abi
|
|
* @brief The cross-vendor C++ Application Binary Interface. A
|
|
* namespace alias to __cxxabiv1, but user programs should use the
|
|
* alias 'abi'.
|
|
*
|
|
* A brief overview of an ABI is given in the libstdc++ FAQ, question
|
|
* 5.8 (you may have a copy of the FAQ locally, or you can view the online
|
|
* version at http://gcc.gnu.org/onlinedocs/libstdc++/faq.html#5_8 ).
|
|
*
|
|
* GCC subscribes to a cross-vendor ABI for C++, sometimes
|
|
* called the IA64 ABI because it happens to be the native ABI for that
|
|
* platform. It is summarized at http://www.codesourcery.com/cxx-abi/
|
|
* along with the current specification.
|
|
*
|
|
* For users of GCC greater than or equal to 3.x, entry points are
|
|
* available in <cxxabi.h>, which notes, <em>'It is not normally
|
|
* necessary for user programs to include this header, or use the
|
|
* entry points directly. However, this header is available should
|
|
* that be needed.'</em>
|
|
*/
|
|
namespace abi = __cxxabiv1;
|
|
|
|
namespace __gnu_cxx
|
|
{
|
|
/**
|
|
* @brief Exception thrown by __cxa_guard_acquire.
|
|
* @ingroup exceptions
|
|
*
|
|
* 6.7[stmt.dcl]/4: If control re-enters the declaration (recursively)
|
|
* while the object is being initialized, the behavior is undefined.
|
|
*
|
|
* Since we already have a library function to handle locking, we might
|
|
* as well check for this situation and throw an exception.
|
|
* We use the second byte of the guard variable to remember that we're
|
|
* in the middle of an initialization.
|
|
*/
|
|
class recursive_init_error: public std::exception
|
|
{
|
|
public:
|
|
recursive_init_error() throw() { }
|
|
virtual ~recursive_init_error() throw ();
|
|
};
|
|
}
|
|
#endif // __cplusplus
|
|
|
|
#pragma GCC visibility pop
|
|
|
|
#endif // __CXXABI_H
|