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Remove dependancy on __refstring header; use local copy instead.
This patch removes the dependancy on libc++'s __refstring header, which was only a header in the first place so that libc++abi could build library code using it, and not because libc++ needed it in the headers. This patch allows libc++ to stop shipping <__refstring> publicaly at the cost of duplicating it across projects. Ideally libc++abi would always require the libc++ sources when building, but that's a separate discussion I plan to start on the mailing lists shortly. llvm-svn: 307748
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131
libcxxabi/src/include/refstring.h
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131
libcxxabi/src/include/refstring.h
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//===------------------------ __refstring ---------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// FIXME: This file is copied from libcxx/src/include/refstring.h. Instead of
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// duplicating the file in libc++abi we should require that the libc++ sources
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// are available when building libc++abi.
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#ifndef _LIBCPPABI_REFSTRING_H
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#define _LIBCPPABI_REFSTRING_H
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#include <__config>
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#include <stdexcept>
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#include <cstddef>
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#include <cstring>
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#ifdef __APPLE__
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#include <dlfcn.h>
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#include <mach-o/dyld.h>
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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namespace __refstring_imp { namespace {
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typedef int count_t;
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struct _Rep_base {
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std::size_t len;
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std::size_t cap;
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count_t count;
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};
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inline _Rep_base* rep_from_data(const char *data_) noexcept {
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char *data = const_cast<char *>(data_);
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return reinterpret_cast<_Rep_base *>(data - sizeof(_Rep_base));
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}
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inline char * data_from_rep(_Rep_base *rep) noexcept {
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char *data = reinterpret_cast<char *>(rep);
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return data + sizeof(*rep);
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}
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#if defined(__APPLE__)
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inline
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const char* compute_gcc_empty_string_storage() _NOEXCEPT
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{
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void* handle = dlopen("/usr/lib/libstdc++.6.dylib", RTLD_NOLOAD);
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if (handle == nullptr)
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return nullptr;
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void* sym = dlsym(handle, "_ZNSs4_Rep20_S_empty_rep_storageE");
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if (sym == nullptr)
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return nullptr;
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return data_from_rep(reinterpret_cast<_Rep_base *>(sym));
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}
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inline
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const char*
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get_gcc_empty_string_storage() _NOEXCEPT
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{
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static const char* p = compute_gcc_empty_string_storage();
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return p;
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}
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#endif
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}} // namespace __refstring_imp
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using namespace __refstring_imp;
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inline
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__libcpp_refstring::__libcpp_refstring(const char* msg) {
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std::size_t len = strlen(msg);
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_Rep_base* rep = static_cast<_Rep_base *>(::operator new(sizeof(*rep) + len + 1));
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rep->len = len;
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rep->cap = len;
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rep->count = 0;
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char *data = data_from_rep(rep);
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std::memcpy(data, msg, len + 1);
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__imp_ = data;
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}
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inline
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__libcpp_refstring::__libcpp_refstring(const __libcpp_refstring &s) _NOEXCEPT
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: __imp_(s.__imp_)
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{
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if (__uses_refcount())
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__sync_add_and_fetch(&rep_from_data(__imp_)->count, 1);
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}
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inline
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__libcpp_refstring& __libcpp_refstring::operator=(__libcpp_refstring const& s) _NOEXCEPT {
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bool adjust_old_count = __uses_refcount();
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struct _Rep_base *old_rep = rep_from_data(__imp_);
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__imp_ = s.__imp_;
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if (__uses_refcount())
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__sync_add_and_fetch(&rep_from_data(__imp_)->count, 1);
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if (adjust_old_count)
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{
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if (__sync_add_and_fetch(&old_rep->count, count_t(-1)) < 0)
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{
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::operator delete(old_rep);
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}
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}
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return *this;
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}
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inline
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__libcpp_refstring::~__libcpp_refstring() {
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if (__uses_refcount()) {
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_Rep_base* rep = rep_from_data(__imp_);
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if (__sync_add_and_fetch(&rep->count, count_t(-1)) < 0) {
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::operator delete(rep);
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}
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}
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}
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inline
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bool __libcpp_refstring::__uses_refcount() const {
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#ifdef __APPLE__
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return __imp_ != get_gcc_empty_string_storage();
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#else
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return true;
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#endif
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}
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_LIBCPP_END_NAMESPACE_STD
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#endif //_LIBCPPABI_REFSTRING_H
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@ -7,7 +7,7 @@
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//
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//===----------------------------------------------------------------------===//
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#include "__refstring"
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#include "include/refstring.h"
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#include "stdexcept"
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#include "new"
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#include <cstdlib>
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