mirror of git://gcc.gnu.org/git/gcc.git
531 lines
13 KiB
C++
531 lines
13 KiB
C++
// New abi Support -*- C++ -*-
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// Copyright (C) 2000-2018 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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// 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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// 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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#include <cxxabi.h>
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#include <new>
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#include <exception>
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#include <bits/exception_defines.h>
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#include "unwind-cxx.h"
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namespace __cxxabiv1
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{
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namespace
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{
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struct uncatch_exception
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{
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uncatch_exception();
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~uncatch_exception () { __cxa_begin_catch (&p->unwindHeader); }
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__cxa_exception* p;
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private:
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uncatch_exception&
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operator=(const uncatch_exception&);
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uncatch_exception(const uncatch_exception&);
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};
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uncatch_exception::uncatch_exception() : p(0)
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{
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__cxa_eh_globals *globals = __cxa_get_globals_fast ();
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p = globals->caughtExceptions;
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p->handlerCount -= 1;
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globals->caughtExceptions = p->nextException;
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globals->uncaughtExceptions += 1;
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}
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// Compute the total size with overflow checking.
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std::size_t compute_size(std::size_t element_count,
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std::size_t element_size,
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std::size_t padding_size)
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{
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if (element_size && element_count > std::size_t(-1) / element_size)
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_GLIBCXX_THROW_OR_ABORT(std::bad_alloc());
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std::size_t size = element_count * element_size;
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if (size + padding_size < size)
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_GLIBCXX_THROW_OR_ABORT(std::bad_alloc());
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return size + padding_size;
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}
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}
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// Allocate and construct array.
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extern "C" void *
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__cxa_vec_new(std::size_t element_count,
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std::size_t element_size,
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std::size_t padding_size,
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__cxa_cdtor_type constructor,
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__cxa_cdtor_type destructor)
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{
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return __cxa_vec_new2(element_count, element_size, padding_size,
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constructor, destructor,
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&operator new[], &operator delete []);
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}
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extern "C" void *
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__cxa_vec_new2(std::size_t element_count,
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std::size_t element_size,
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std::size_t padding_size,
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__cxa_cdtor_type constructor,
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__cxa_cdtor_type destructor,
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void *(*alloc) (std::size_t),
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void (*dealloc) (void *))
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{
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std::size_t size
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= compute_size(element_count, element_size, padding_size);
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char *base = static_cast <char *> (alloc (size));
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if (!base)
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return base;
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if (padding_size)
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{
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base += padding_size;
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reinterpret_cast <std::size_t *> (base)[-1] = element_count;
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#ifdef _GLIBCXX_ELTSIZE_IN_COOKIE
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reinterpret_cast <std::size_t *> (base)[-2] = element_size;
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#endif
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}
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__try
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{
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__cxa_vec_ctor(base, element_count, element_size,
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constructor, destructor);
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}
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__catch(...)
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{
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{
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uncatch_exception ue;
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// Core issue 901 will probably be resolved such that a
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// deleted operator delete means not freeing memory here.
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if (dealloc)
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dealloc(base - padding_size);
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}
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__throw_exception_again;
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}
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return base;
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}
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extern "C" void *
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__cxa_vec_new3(std::size_t element_count,
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std::size_t element_size,
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std::size_t padding_size,
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__cxa_cdtor_type constructor,
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__cxa_cdtor_type destructor,
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void *(*alloc) (std::size_t),
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void (*dealloc) (void *, std::size_t))
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{
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std::size_t size
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= compute_size(element_count, element_size, padding_size);
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char *base = static_cast<char *>(alloc (size));
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if (!base)
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return base;
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if (padding_size)
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{
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base += padding_size;
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reinterpret_cast<std::size_t *>(base)[-1] = element_count;
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#ifdef _GLIBCXX_ELTSIZE_IN_COOKIE
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reinterpret_cast <std::size_t *> (base)[-2] = element_size;
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#endif
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}
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__try
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{
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__cxa_vec_ctor(base, element_count, element_size,
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constructor, destructor);
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}
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__catch(...)
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{
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{
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uncatch_exception ue;
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if (dealloc)
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dealloc(base - padding_size, size);
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}
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__throw_exception_again;
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}
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return base;
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}
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// Construct array.
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extern "C" __cxa_vec_ctor_return_type
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__cxa_vec_ctor(void *array_address,
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std::size_t element_count,
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std::size_t element_size,
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__cxa_cdtor_type constructor,
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__cxa_cdtor_type destructor)
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{
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std::size_t ix = 0;
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char *ptr = static_cast<char *>(array_address);
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__try
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{
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if (constructor)
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for (; ix != element_count; ix++, ptr += element_size)
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constructor(ptr);
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}
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__catch(...)
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{
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{
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uncatch_exception ue;
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__cxa_vec_cleanup(array_address, ix, element_size, destructor);
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}
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__throw_exception_again;
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}
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_GLIBCXX_CXA_VEC_CTOR_RETURN (array_address);
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}
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// Construct an array by copying.
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extern "C" __cxa_vec_ctor_return_type
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__cxa_vec_cctor(void *dest_array,
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void *src_array,
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std::size_t element_count,
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std::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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{
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std::size_t ix = 0;
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char *dest_ptr = static_cast<char *>(dest_array);
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char *src_ptr = static_cast<char *>(src_array);
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__try
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{
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if (constructor)
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for (; ix != element_count;
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ix++, src_ptr += element_size, dest_ptr += element_size)
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constructor(dest_ptr, src_ptr);
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}
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__catch(...)
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{
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{
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uncatch_exception ue;
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__cxa_vec_cleanup(dest_array, ix, element_size, destructor);
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}
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__throw_exception_again;
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}
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_GLIBCXX_CXA_VEC_CTOR_RETURN (dest_array);
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}
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// Destruct array.
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extern "C" void
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__cxa_vec_dtor(void *array_address,
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std::size_t element_count,
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std::size_t element_size,
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__cxa_cdtor_type destructor)
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{
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if (destructor)
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{
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char *ptr = static_cast<char *>(array_address);
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std::size_t ix = element_count;
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ptr += element_count * element_size;
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__try
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{
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while (ix--)
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{
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ptr -= element_size;
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destructor(ptr);
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}
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}
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__catch(...)
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{
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{
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uncatch_exception ue;
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__cxa_vec_cleanup(array_address, ix, element_size, destructor);
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}
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__throw_exception_again;
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}
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}
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}
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// Destruct array as a result of throwing an exception.
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// [except.ctor]/3 If a destructor called during stack unwinding
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// exits with an exception, terminate is called.
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extern "C" void
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__cxa_vec_cleanup(void *array_address,
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std::size_t element_count,
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std::size_t element_size,
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__cxa_cdtor_type destructor) throw()
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{
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if (destructor)
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{
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char *ptr = static_cast <char *> (array_address);
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std::size_t ix = element_count;
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ptr += element_count * element_size;
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__try
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{
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while (ix--)
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{
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ptr -= element_size;
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destructor(ptr);
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}
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}
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__catch(...)
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{
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std::terminate();
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}
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}
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}
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// Destruct and release array.
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extern "C" void
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__cxa_vec_delete(void *array_address,
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std::size_t element_size,
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std::size_t padding_size,
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__cxa_cdtor_type destructor)
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{
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__cxa_vec_delete2(array_address, element_size, padding_size,
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destructor,
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&operator delete []);
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}
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extern "C" void
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__cxa_vec_delete2(void *array_address,
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std::size_t element_size,
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std::size_t padding_size,
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__cxa_cdtor_type destructor,
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void (*dealloc) (void *))
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{
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if (!array_address)
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return;
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char* base = static_cast<char *>(array_address);
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if (padding_size)
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{
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std::size_t element_count = reinterpret_cast<std::size_t *>(base)[-1];
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base -= padding_size;
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__try
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{
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__cxa_vec_dtor(array_address, element_count, element_size,
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destructor);
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}
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__catch(...)
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{
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{
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uncatch_exception ue;
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dealloc(base);
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}
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__throw_exception_again;
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}
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}
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dealloc(base);
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}
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extern "C" void
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__cxa_vec_delete3(void *array_address,
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std::size_t element_size,
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std::size_t padding_size,
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__cxa_cdtor_type destructor,
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void (*dealloc) (void *, std::size_t))
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{
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if (!array_address)
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return;
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char* base = static_cast <char *> (array_address);
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std::size_t size = 0;
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if (padding_size)
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{
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std::size_t element_count = reinterpret_cast<std::size_t *> (base)[-1];
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base -= padding_size;
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size = element_count * element_size + padding_size;
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__try
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{
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__cxa_vec_dtor(array_address, element_count, element_size,
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destructor);
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}
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__catch(...)
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{
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{
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uncatch_exception ue;
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dealloc(base, size);
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}
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__throw_exception_again;
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}
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}
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dealloc(base, size);
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}
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} // namespace __cxxabiv1
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#if defined(__arm__) && defined(__ARM_EABI__)
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// The ARM C++ ABI requires that the library provide these additional
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// helper functions. There are placed in this file, despite being
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// architecture-specifier, so that the compiler can inline the __cxa
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// functions into these functions as appropriate.
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namespace __aeabiv1
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{
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extern "C" void *
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__aeabi_vec_ctor_nocookie_nodtor (void *array_address,
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abi::__cxa_cdtor_type constructor,
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std::size_t element_size,
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std::size_t element_count)
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{
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return abi::__cxa_vec_ctor (array_address, element_count, element_size,
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constructor, /*destructor=*/NULL);
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}
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extern "C" void *
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__aeabi_vec_ctor_cookie_nodtor (void *array_address,
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abi::__cxa_cdtor_type constructor,
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std::size_t element_size,
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std::size_t element_count)
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{
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if (array_address == NULL)
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return NULL;
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array_address = reinterpret_cast<std::size_t *>(array_address) + 2;
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reinterpret_cast<std::size_t *>(array_address)[-2] = element_size;
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reinterpret_cast<std::size_t *>(array_address)[-1] = element_count;
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return abi::__cxa_vec_ctor (array_address,
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element_count, element_size,
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constructor, /*destructor=*/NULL);
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}
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extern "C" void *
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__aeabi_vec_cctor_nocookie_nodtor (void *dest_array,
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void *src_array,
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std::size_t element_size,
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std::size_t element_count,
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void *(*constructor) (void *, void *))
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{
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return abi::__cxa_vec_cctor (dest_array, src_array,
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element_count, element_size,
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constructor, NULL);
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}
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extern "C" void *
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__aeabi_vec_new_cookie_noctor (std::size_t element_size,
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std::size_t element_count)
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{
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return abi::__cxa_vec_new(element_count, element_size,
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2 * sizeof (std::size_t),
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/*constructor=*/NULL, /*destructor=*/NULL);
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}
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extern "C" void *
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__aeabi_vec_new_nocookie (std::size_t element_size,
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std::size_t element_count,
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abi::__cxa_cdtor_type constructor)
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{
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return abi::__cxa_vec_new (element_count, element_size, 0, constructor,
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NULL);
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}
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extern "C" void *
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__aeabi_vec_new_cookie_nodtor (std::size_t element_size,
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std::size_t element_count,
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abi::__cxa_cdtor_type constructor)
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{
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return abi::__cxa_vec_new(element_count, element_size,
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2 * sizeof (std::size_t),
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constructor, NULL);
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}
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extern "C" void *
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__aeabi_vec_new_cookie(std::size_t element_size,
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std::size_t element_count,
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abi::__cxa_cdtor_type constructor,
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abi::__cxa_cdtor_type destructor)
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{
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return abi::__cxa_vec_new (element_count, element_size,
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2 * sizeof (std::size_t),
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constructor, destructor);
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}
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extern "C" void *
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__aeabi_vec_dtor (void *array_address,
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abi::__cxa_cdtor_type destructor,
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std::size_t element_size,
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std::size_t element_count)
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{
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abi::__cxa_vec_dtor (array_address, element_count, element_size,
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destructor);
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return reinterpret_cast<std::size_t*> (array_address) - 2;
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}
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extern "C" void *
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__aeabi_vec_dtor_cookie (void *array_address,
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abi::__cxa_cdtor_type destructor)
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{
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if (!array_address)
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return NULL;
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abi::__cxa_vec_dtor (array_address,
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reinterpret_cast<std::size_t *>(array_address)[-1],
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reinterpret_cast<std::size_t *>(array_address)[-2],
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destructor);
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return reinterpret_cast<std::size_t*> (array_address) - 2;
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}
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extern "C" void
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__aeabi_vec_delete (void *array_address,
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abi::__cxa_cdtor_type destructor)
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{
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if (!array_address)
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return;
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abi::__cxa_vec_delete (array_address,
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reinterpret_cast<std::size_t *>(array_address)[-2],
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2 * sizeof (std::size_t),
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destructor);
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}
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extern "C" void
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__aeabi_vec_delete3 (void *array_address,
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abi::__cxa_cdtor_type destructor,
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void (*dealloc) (void *, std::size_t))
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{
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if (!array_address)
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return;
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abi::__cxa_vec_delete3 (array_address,
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reinterpret_cast<std::size_t *>(array_address)[-2],
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2 * sizeof (std::size_t),
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destructor, dealloc);
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}
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extern "C" void
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__aeabi_vec_delete3_nodtor (void *array_address,
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void (*dealloc) (void *, std::size_t))
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{
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if (!array_address)
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return;
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abi::__cxa_vec_delete3 (array_address,
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reinterpret_cast<std::size_t *>(array_address)[-2],
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2 * sizeof (std::size_t),
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/*destructor=*/NULL, dealloc);
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}
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} // namespace __aeabiv1
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#endif // defined(__arm__) && defined(__ARM_EABI__)
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