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This patch replaces the recursive implementation of the DFS executor with an iterative one using an explicit heap-based stack. System stack usage of the executor is now constant with respect to input size rather than linear, avoding stack overflow errors when processing long inputs. PR libstdc++/86164 libstdc++-v3/ChangeLog: * include/bits/regex.h (__detail::_Executor): Use inline namespace _V2. * include/bits/regex_executor.h (__detail::_ExecutorFrame): Declare. (__detail::_Executor): Use inline namespace _V2. (__detail::_Executor::_M_node): Declare. (__detail::_Executor::_M_frames): New data member. * include/bits/regex_executor.tcc (__detail::_ExecutorFrameOpcode): New. (__detail::_ExecutorFrameBase): New. (__detail::_ExecutorFrame): New. (__detail::_Executor): Use inline namespace _V2. (__detail::_Executor::_M_rep_once_more): Replace recursive _M_dfs calls with an _S_opcode_next frame push, and any work after such calls with an appropriate frame push. (__detail::_M_handle_repeat): Likewise. (__detail::_M_handle_subexpr_begin): Likewise. (__detail::_M_handle_subexpr_end): Likewise. (__detail::_M_handle_line_begin_assertion): Likewise. (__detail::_M_handle_line_end_assertion): Likewise. (__detail::_M_handle_word_boundary): Likewise. (__detail::_M_handle_subexpr_lookahead): Likewise. (__detail::_M_handle_match): Likewise. (__detail::_M_handle_backref): Likewise. (__detail::_M_handle_accept): Likewise. (__detail::_M_handle_alternative): Likewise. (__detail::_M_node): Factored out from _M_dfs. (__detail::_M_dfs): Push an initial frame to _M_frames that visits the starting node and pass this stack each subroutine. Pop the latest _ExecutorFrame from _M_frames and handle appropriately according to its _ExecutorFrameOpcode. Loop until _M_frames is empty. Reviewed-by: Tomasz Kamiński <tkaminsk@redhat.com> Reviewed-by: Jonathan Wakely <jwakely@redhat.com>
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