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// unwind.h: Rcpp R/C++ interface class library -- Unwind Protect
//
// Copyright (C) 2018 - 2020 RStudio
// Copyright (C) 2021 - 2025 RStudio, Dirk Eddelbuettel and Iñaki Ucar
//
// This file is part of Rcpp.
//
// Rcpp is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 2 of the License, or
// (at your option) any later version.
//
// Rcpp is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Rcpp. If not, see <http://www.gnu.org/licenses/>.
#ifndef RCPP_UNWINDPROTECT_H
#define RCPP_UNWINDPROTECT_H
#include <csetjmp>
#include <functional>
namespace Rcpp { namespace internal {
struct UnwindData {
std::jmp_buf jmpbuf;
};
// First jump back to the protected context with a C longjmp because
// `Rcpp_protected_eval()` is called from C and we can't safely throw
// exceptions across C frames.
inline void maybeJump(void* unwind_data, Rboolean jump) {
if (jump) {
UnwindData* data = static_cast<UnwindData*>(unwind_data);
longjmp(data->jmpbuf, 1);
}
}
inline SEXP unwindProtectUnwrap(void* data) {
std::function<SEXP(void)>* callback = (std::function<SEXP(void)>*) data;
return (*callback)();
}
}} // namespace Rcpp::internal
namespace Rcpp {
inline SEXP unwindProtect(SEXP (*callback)(void* data), void* data) {
internal::UnwindData unwind_data;
Shield<SEXP> token(::R_MakeUnwindCont());
if (setjmp(unwind_data.jmpbuf)) {
// Keep the token protected while unwinding because R code might run
// in C++ destructors. Can't use PROTECT() for this because
// UNPROTECT() might be called in a destructor, for instance if a
// Shield<SEXP> is on the stack.
::R_PreserveObject(token);
throw LongjumpException(token);
}
return ::R_UnwindProtect(callback, data,
internal::maybeJump, &unwind_data,
token);
}
inline SEXP unwindProtect(std::function<SEXP(void)> callback) {
return unwindProtect(&internal::unwindProtectUnwrap, &callback);
}
} // namespace Rcpp
#endif
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