ESP shuts down when instantiating std::regex object

[Gei0r]

Basic Infos

• This issue complies with the issue POLICY doc.
• I have read the documentation at readthedocs and the issue is not addressed there.
• I have tested that the issue is present in current master branch (aka latest git).
• I have searched the issue tracker for a similar issue.
• If there is a stack dump, I have decoded it.
• I have filled out all fields below.

Platform

• Hardware: ESP-01 (D1 mini)
• Core Version: 2.5.2
• Development Env: Arduino IDE + Platformio
• Operating System: Windows

Settings in IDE

• Module: WeMos D1 R1
• Flash Size: 4MB (no SPIFFS)
• CPU Frequency: 80Mhz

Problem Description

When instantiating a std::regex object, the D1 mini shuts down.
It only works for very simple regexes, such as /a/, but not for (a little) more complicated ones.

I also tried enabling C++ exceptions and catching something, but nothing is caught.

MCVE Sketch

#include <Arduino.h>
#include <regex>

void setup() {
  Serial.begin(115200);
  Serial.println("Hi there!"); delay(20);
  static const std::regex holdRegex("hold ([\\d,=]+) (\\d+)");
  Serial.println("After instantiation"); delay(20);
}

void loop() {
}

Debug Messages

Hi there!

Exception (3):
epc1=0x4020b4d8 epc2=0x00000000 epc3=0x00000000 excvaddr=0x4025a301 depc=0x00000000

>>>stack>>>

ctx: cont
sp: 3ffff610 end: 3fffffc0 offset: 01a0
3ffff7b0:  feefeffe feefeffe feefeffe feefeffe  
3ffff7c0:  4025a2f8 00000000 4025a314 402085fa  
3ffff7d0:  feefeffe feefeffe feefeffe feefeffe  
3ffff7e0:  00000000 feefeffe feefeffe feefeffe  
3ffff7f0:  feefeffe feefeffe feefeffe 3ffeed68  
3ffff800:  40207ef0 00000000 3ffeed68 4020897c  
3ffff810:  feefeffe feefeffe feefeffe feefeffe  
3ffff820:  feefeffe feefeffe feefeffe feefeffe  
3ffff830:  feefeffe feefeffe feefeffe feefeffe  
3ffff840:  feefeffe feefeffe feefeffe 3ffeed68  
3ffff850:  40207ef0 3ffffb34 3ffeed68 40208e90  
3ffff860:  feefeffe feefeffe feefeffe feefeffe  
3ffff870:  feefeffe feefeffe feefeffe 40207ef1  
3ffff880:  3ffffb80 3ffffae4 3ffff8d0 40207109  
3ffff890:  feefeffe feefeffe feefeffe feefeffe  
3ffff8a0:  feefeffe feefeffe feefeffe feefeffe  
3ffff8b0:  feefeffe feefeffe feefeffe 40207ef1  
3ffff8c0:  3ffffb80 40214a27 3ffffae4 40207b63  
3ffff8d0:  00000000 00000000 00000000 00000000  
3ffff8e0:  00000000 00000000 00000000 00000000  
3ffff8f0:  00000000 00000000 00000000 00000000  
3ffff900:  00000000 00000000 00000000 00000000  
3ffff910:  00000000 00000000 00000000 00000000  
3ffff920:  00000000 00000000 00000000 00000000  
3ffff930:  00000000 00000000 00000000 00000000  
3ffff940:  00000000 00000000 00000000 00000000  
3ffff950:  00000000 00000000 00000000 00000000  
3ffff960:  00000000 00000000 00000000 00000000  
3ffff970:  00000000 00000000 00000000 00000000  
3ffff980:  00000000 00000000 feefeffe feefeffe  
3ffff990:  feefeffe feefeffe feefeffe 3ffff9b0  
3ffff9a0:  00000001 3fff14fc 000000b8 40207ef1  
3ffff9b0:  feefeffe feefeffe feefeffe feefeffe  
3ffff9c0:  feefeffe feefeffe feefeffe feefeffe  
3ffff9d0:  feefeffe feefeffe feefeffe feefeffe  
3ffff9e0:  feefeffe feefeffe feefeffe feefeffe  
3ffff9f0:  feefeffe feefeffe feefeffe feefeffe  
3ffffa00:  feefeffe feefeffe feefeffe feefeffe  
3ffffa10:  feefeffe feefeffe feefeffe feefeffe  
3ffffa20:  feefeffe feefeffe feefeffe feefeffe  
3ffffa30:  feefeffe feefeffe feefeffe feefeffe  
3ffffa40:  feefeffe feefeffe feefeffe feefeffe  
3ffffa50:  feefeffe feefeffe feefeffe feefeffe  
3ffffa60:  feefeffe feefeffe feefeffe feefeffe  
3ffffa70:  feefeffe feefeffe feefeffe feefeffe  
3ffffa80:  feefeffe feefeffe feefeffe feefeffe  
3ffffa90:  feefeffe feefeffe feefeffe 00000001  
3ffffaa0:  00000001 40214bc4 0000000e 40204f74  
3ffffab0:  feefeffe 3ffffeec 0000000e 40214bc4  
3ffffac0:  00000001 40214bc4 00000001 40225344  
3ffffad0:  feefeffe 3ffffeec 00000000 0000000b  
3ffffae0:  00000001 00000000 00000000 00000000  
3ffffaf0:  00000000 00000000 00000000 00000000  
3ffffb00:  00000000 00000000 00000000 00000000  
3ffffb10:  00000000 00000000 00000000 00000000  
3ffffb20:  00000000 00000000 00000000 40207ef1  
3ffffb30:  00000000 00000000 00000000 00000000  
3ffffb40:  40000000 00000000 00000000 00000000  
3ffffb50:  00000000 00000000 00000000 00000000  
3ffffb60:  00000001 00000000 00000001 00000004  
3ffffb70:  3fff14fc 402149b8 3fff14fc 40214a27  
3ffffb80:  00000001 00000004 3fff151c 4022671a  
3ffffb90:  feefeffe 00000001 3ffffed0 40202580  
3ffffba0:  feefeffe feefeffe feefeffe feefeffe  
3ffffbb0:  feefeffe feefeffe feefeffe feefeffe  
3ffffbc0:  3ffeed0c feefeffe feefeffe feefeffe  
3ffffbd0:  feefeffe feefeffe feefeffe 3ffffef8  
3ffffbe0:  00000001 00000000 3ffffed0 40202bd8  
3ffffbf0:  4000050c feefeffe feefeffe feefeffe  
3ffffc00:  3ffeee28 0000024f 0000024f 40204d30  
3ffffc10:  00000008 3fff15a4 3fff1594 40205158  
3ffffc20:  3ffeee28 00000245 00000245 3ffffef8  
3ffffc30:  00000001 40214bc4 00000004 3ffffef8  
3ffffc40:  00000001 00000001 3ffffed0 40202c66  
3ffffc50:  3ffffef8 00000001 3ffffed0 40202908  
3ffffc60:  3ffeee28 00000245 00000245 40204d30  
3ffffc70:  00000001 00000001 3ffffed0 4020297c  
3ffffc80:  00000004 ffffffff 00000004 402142fe  
3ffffc90:  00000000 00000000 00000000 40201146  
3ffffca0:  00000000 00000001 3ffffed0 3ffffef8  
3ffffcb0:  00000001 00000001 3ffffed0 40202b58  
3ffffcc0:  3fff141c 00000001 40201110 40205480  
3ffffcd0:  3ffffef8 00000006 00000006 ffffffff  
3ffffce0:  3ffffef8 00000005 00000005 ffffffff  
3ffffcf0:  3fff1434 00000001 00000000 402027f3  
3ffffd00:  3ffffef8 00000020 00000004 3fffff14  
3ffffd10:  00000001 3fffff2c 3ffffed0 40202c66  
3ffffd20:  3ffffef8 3fffff2c 3ffffed0 40202908  
3ffffd30:  00000001 00000001 3ffffed0 40202c5d  
3ffffd40:  00000001 3fffff2c 3ffffed0 40202933  
3ffffd50:  3ffffef8 00000005 00000005 ffffffff  
3ffffd60:  00000001 3fffff2c 3ffffed0 40202933  
3ffffd70:  3ffffef8 00000004 00000004 ffffffff  
3ffffd80:  00000001 3fffff2c 3ffffed0 40202933  
3ffffd90:  3ffffef8 00000003 00000003 ffffffff  
3ffffda0:  00000001 3fffff2c 3ffffed0 40202933  
3ffffdb0:  3ffffef8 00000002 00000002 ffffffff  
3ffffdc0:  00000001 3fffff2c 3ffffed0 40202933  
3ffffdd0:  3ffffef8 00000001 00000001 ffffffff  
3ffffde0:  00000000 3ffffef8 3ffffed0 4020297c  
3ffffdf0:  00000004 ffffffff 00000004 402142fe  
3ffffe00:  00000000 00000000 00000000 40201146  
3ffffe10:  00000000 3ffffef8 3ffffed0 3fffff14  
3ffffe20:  00000000 3ffffef8 3ffffed0 40202da4  
3ffffe30:  3ffefc1c feefeffe feefeffe feefeffe  
3ffffe40:  feefeffe feefeffe feefeffe feefeffe  
3ffffe50:  feefeffe feefeffe feefeffe feefeffe  
3ffffe60:  feefeffe feefeffe feefeffe feefeffe  
3ffffe70:  3fff13fc feefeffe 40201110 40205480  
3ffffe80:  3ffffef8 00000000 00000000 ffffffff  
3ffffe90:  feefeffe feefeffe feefeffe 3ffeed98  
3ffffea0:  3ffffed4 4020d803 00000050 40204f74  
3ffffeb0:  feefeffe 3ffef388 00000007 3ffeed0c  
3ffffec0:  3ffeed08 3ffeed10 3ffeed18 40202ef0  
3ffffed0:  3ffeed0c 40205768 3ffe878e 3ffe878e  
3ffffee0:  00000010 3ffef8f8 0000000e 3fff1438  
3ffffef0:  00000009 3fff13f0 40205740 3fff15ac  
3fffff00:  3fff16fc 3fff172c 00000010 00000000  
3fffff10:  3ffef140 00000000 00000000 3fffff14  
3fffff20:  3fffff14 00000000 00000002 3fff1404  
3fffff30:  3fff1404 3fff1414 3ffefc1c 4021d080  
3fffff40:  3fffdad0 3ffeed98 3ffeed0c 4021d0a6  
3fffff50:  40203dc6 00000014 00000014 3ffeed0c  
3fffff60:  3ffeed08 3ffeed3c 3ffeed18 402030b9  
3fffff70:  3ffe878e 3ffe877a feefeffe feefeffe  
3fffff80:  feefeffe feefeffe feefeffe feefeffe  
3fffff90:  feefeffe feefeffe feefeffe 3ffeed98  
3fffffa0:  3fffdad0 00000000 3ffeed64 402038f4  
3fffffb0:  feefeffe feefeffe 3ffe85c4 401004d9  
<<<stack<<<

 ets Jan  8 2013,rst cause:2, boot mode:(3,6)

load 0x4010f000, len 1384, room 16 
tail 8
chksum 0x2d
csum 0x2d
v8b899c12
~ld

Decoded stack trace:

Exception 3: LoadStoreError: Processor internal physical address or data error during load or store
PC: 0x4020b4d8
EXCVADDR: 0x4025a301

Decoding stack results
0x402085fa: classify_object_over_fdes at ../../../../dl/gcc-xtensa/libgcc/unwind-dw2-fde.c line 628
0x40207ef0: _Unwind_RaiseException at ../../../../dl/gcc-xtensa/libgcc/unwind.inc line 88
0x4020897c: search_object at ../../../../dl/gcc-xtensa/libgcc/unwind-dw2-fde.c line 749
0x40207ef0: _Unwind_RaiseException at ../../../../dl/gcc-xtensa/libgcc/unwind.inc line 88
0x40208e90: _Unwind_Find_FDE at ../../../../dl/gcc-xtensa/libgcc/unwind-dw2-fde.c line 1025
0x40207ef1: _Unwind_RaiseException at ../../../../dl/gcc-xtensa/libgcc/unwind.inc line 89
0x40207109: uw_frame_state_for at ../../../../dl/gcc-xtensa/libgcc/unwind-dw2.c line 1245
0x40207ef1: _Unwind_RaiseException at ../../../../dl/gcc-xtensa/libgcc/unwind.inc line 89
0x40214a27: __cxxabiv1::__cxa_throw(void*, std::type_info*, void (*)(void*)) at ../../../../../dl/gcc-xtensa/libstdc++-v3/libsupc++/eh_throw.cc line 83
0x40207b63: uw_init_context_1 at ../../../../dl/gcc-xtensa/libgcc/unwind-dw2.c line 1567
0x40207ef1: _Unwind_RaiseException at ../../../../dl/gcc-xtensa/libgcc/unwind.inc line 89
0x40214bc4: operator new(unsigned int) at ../../../../../dl/gcc-xtensa/libstdc++-v3/libsupc++/new_op.cc line 52
0x40204f74: malloc(size_t) at C:\Users\bw1ebed0\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.5.2\cores\esp8266\umm_malloc\umm_malloc.cpp line 1677
0x40214bc4: operator new(unsigned int) at ../../../../../dl/gcc-xtensa/libstdc++-v3/libsupc++/new_op.cc line 52
0x40214bc4: operator new(unsigned int) at ../../../../../dl/gcc-xtensa/libstdc++-v3/libsupc++/new_op.cc line 52
0x40225344: std::string::_Rep::_S_create(unsigned int, unsigned int, std::allocator  const&) at /workdir/arena/gcc/xtensa-lx106-elf/libstdc++-v3/include/bits/basic_string.tcc line 621
0x40207ef1: _Unwind_RaiseException at ../../../../dl/gcc-xtensa/libgcc/unwind.inc line 89
0x402149b8: __gxx_exception_cleanup(_Unwind_Reason_Code, _Unwind_Exception*) at ../../../../../dl/gcc-xtensa/libstdc++-v3/libsupc++/eh_throw.cc line 33
0x40214a27: __cxxabiv1::__cxa_throw(void*, std::type_info*, void (*)(void*)) at ../../../../../dl/gcc-xtensa/libstdc++-v3/libsupc++/eh_throw.cc line 83
0x4022671a: std::__throw_regex_error(std::regex_constants::error_type) at ../../../../../../dl/gcc-xtensa/libstdc++-v3/src/c++11/functexcept.cc line 118
0x40202580: std::__detail::_Compiler   >::_M_bracket_expression() at c:\users\bw1ebed0\appdata\local\arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\2.5.0-3-20ed2b9\xtensa-lx106-elf\include\c++\4.8.2\bits/regex_compiler.h line 974
0x40202bd8: std::__detail::_Compiler   >::_M_atom() at c:\users\bw1ebed0\appdata\local\arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\2.5.0-3-20ed2b9\xtensa-lx106-elf\include\c++\4.8.2\bits/regex_compiler.h line 960
0x40204d30: _umm_free(void*) at C:\Users\bw1ebed0\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.5.2\cores\esp8266\umm_malloc\umm_malloc.cpp line 1304
0x40205158: free(void*) at C:\Users\bw1ebed0\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.5.2\cores\esp8266\umm_malloc\umm_malloc.cpp line 1764
0x40214bc4: operator new(unsigned int) at ../../../../../dl/gcc-xtensa/libstdc++-v3/libsupc++/new_op.cc line 52
0x40202c66: std::__detail::_Compiler   >::_M_term() at c:\users\bw1ebed0\appdata\local\arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\2.5.0-3-20ed2b9\xtensa-lx106-elf\include\c++\4.8.2\bits/regex_compiler.h line 795
0x40202908: std::__detail::_Compiler   >::_M_alternative() at c:\users\bw1ebed0\appdata\local\arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\2.5.0-3-20ed2b9\xtensa-lx106-elf\include\c++\4.8.2\bits/regex_compiler.h line 773
0x40204d30: _umm_free(void*) at C:\Users\bw1ebed0\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.5.2\cores\esp8266\umm_malloc\umm_malloc.cpp line 1304
0x4020297c: std::__detail::_Compiler   >::_M_disjunction() at c:\users\bw1ebed0\appdata\local\arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\2.5.0-3-20ed2b9\xtensa-lx106-elf\include\c++\4.8.2\bits/regex_compiler.h line 759
0x402142fe: operator delete(void*) at ../../../../../dl/gcc-xtensa/libstdc++-v3/libsupc++/del_op.cc line 48
0x40201146: std::_Function_base::_Base_manager    > >::_M_manager(std::_Any_data&, std::_Any_data const&, std::_Manager_operation) at c:\users\bw1ebed0\appdata\local\arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\2.5.0-3-20ed2b9\xtensa-lx106-elf\include\c++\4.8.2/functional line 1954
0x40202b58: std::__detail::_Compiler   >::_M_atom() at c:\users\bw1ebed0\appdata\local\arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\2.5.0-3-20ed2b9\xtensa-lx106-elf\include\c++\4.8.2\bits/regex_compiler.h line 948
0x40201110: std::_Function_base::_Base_manager    > >::_M_manager(std::_Any_data&, std::_Any_data const&, std::_Manager_operation) at c:\users\bw1ebed0\appdata\local\arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\2.5.0-3-20ed2b9\xtensa-lx106-elf\include\c++\4.8.2/functional line 1931
0x40205480: std::_Function_handler    > >::_M_invoke(std::_Any_data const&, std::__detail::_PatternCursor const&, std::__detail::_Results&) at c:\users\bw1ebed0\appdata\local\arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\2.5.0-3-20ed2b9\xtensa-lx106-elf\include\c++\4.8.2\bits/regex_nfa.h line 97
0x402027f3: std::__detail::_Compiler   >::_M_quantifier() at c:\users\bw1ebed0\appdata\local\arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\2.5.0-3-20ed2b9\xtensa-lx106-elf\include\c++\4.8.2\bits/regex_compiler.h line 866
0x40202c66: std::__detail::_Compiler   >::_M_term() at c:\users\bw1ebed0\appdata\local\arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\2.5.0-3-20ed2b9\xtensa-lx106-elf\include\c++\4.8.2\bits/regex_compiler.h line 795
0x40202908: std::__detail::_Compiler   >::_M_alternative() at c:\users\bw1ebed0\appdata\local\arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\2.5.0-3-20ed2b9\xtensa-lx106-elf\include\c++\4.8.2\bits/regex_compiler.h line 773
0x40202c5d: std::__detail::_Compiler   >::_M_term() at c:\users\bw1ebed0\appdata\local\arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\2.5.0-3-20ed2b9\xtensa-lx106-elf\include\c++\4.8.2\bits/regex_compiler.h line 798
0x40202933: std::__detail::_Compiler   >::_M_alternative() at c:\users\bw1ebed0\appdata\local\arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\2.5.0-3-20ed2b9\xtensa-lx106-elf\include\c++\4.8.2\bits/regex_compiler.h line 777
0x40202933: std::__detail::_Compiler   >::_M_alternative() at c:\users\bw1ebed0\appdata\local\arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\2.5.0-3-20ed2b9\xtensa-lx106-elf\include\c++\4.8.2\bits/regex_compiler.h line 777
0x40202933: std::__detail::_Compiler   >::_M_alternative() at c:\users\bw1ebed0\appdata\local\arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\2.5.0-3-20ed2b9\xtensa-lx106-elf\include\c++\4.8.2\bits/regex_compiler.h line 777
0x40202933: std::__detail::_Compiler   >::_M_alternative() at c:\users\bw1ebed0\appdata\local\arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\2.5.0-3-20ed2b9\xtensa-lx106-elf\include\c++\4.8.2\bits/regex_compiler.h line 777
0x40202933: std::__detail::_Compiler   >::_M_alternative() at c:\users\bw1ebed0\appdata\local\arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\2.5.0-3-20ed2b9\xtensa-lx106-elf\include\c++\4.8.2\bits/regex_compiler.h line 777
0x4020297c: std::__detail::_Compiler   >::_M_disjunction() at c:\users\bw1ebed0\appdata\local\arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\2.5.0-3-20ed2b9\xtensa-lx106-elf\include\c++\4.8.2\bits/regex_compiler.h line 759
0x402142fe: operator delete(void*) at ../../../../../dl/gcc-xtensa/libstdc++-v3/libsupc++/del_op.cc line 48
0x40201146: std::_Function_base::_Base_manager    > >::_M_manager(std::_Any_data&, std::_Any_data const&, std::_Manager_operation) at c:\users\bw1ebed0\appdata\local\arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\2.5.0-3-20ed2b9\xtensa-lx106-elf\include\c++\4.8.2/functional line 1954
0x40202da4: std::__detail::_Compiler   >::_Compiler(char const* const&, char const* const&, std::regex_traits &, unsigned int) at c:\users\bw1ebed0\appdata\local\arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\2.5.0-3-20ed2b9\xtensa-lx106-elf\include\c++\4.8.2\bits/regex_compiler.h line 730
0x40201110: std::_Function_base::_Base_manager    > >::_M_manager(std::_Any_data&, std::_Any_data const&, std::_Manager_operation) at c:\users\bw1ebed0\appdata\local\arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\2.5.0-3-20ed2b9\xtensa-lx106-elf\include\c++\4.8.2/functional line 1931
0x40205480: std::_Function_handler    > >::_M_invoke(std::_Any_data const&, std::__detail::_PatternCursor const&, std::__detail::_Results&) at c:\users\bw1ebed0\appdata\local\arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\2.5.0-3-20ed2b9\xtensa-lx106-elf\include\c++\4.8.2\bits/regex_nfa.h line 97
0x4020d803: wctob at /home/earle/src/esp-quick-toolchain/repo/newlib/newlib/libc/stdlib/wctob.c line 22
0x40204f74: malloc(size_t) at C:\Users\bw1ebed0\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.5.2\cores\esp8266\umm_malloc\umm_malloc.cpp line 1677
0x40202ef0: std::__detail::__compile   >(char const* const&, char const* const&, std::regex_traits &, unsigned int) at c:\users\bw1ebed0\appdata\local\arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\2.5.0-3-20ed2b9\xtensa-lx106-elf\include\c++\4.8.2\bits/regex_compiler.h line 1105
0x4021d080: std::locale::_S_initialize_once() at ../../../../../../dl/gcc-xtensa/libstdc++-v3/src/c++98/locale_init.cc line 267
0x4021d0a6: std::locale::_S_initialize() at ../../../../../../dl/gcc-xtensa/libstdc++-v3/src/c++98/locale_init.cc line 280
0x40203dc6: delay(unsigned long) at C:\Users\bw1ebed0\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.5.2\cores\esp8266\core_esp8266_wiring.cpp line 57
0x402030b9: setup() at D:\UserData\bw1ebed0\Documents\Arduino\Regex/Regex.ino line 9
0x402038f4: loop_wrapper() at C:\Users\bw1ebed0\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.5.2\cores\esp8266\core_esp8266_main.cpp line 122

[devyte]

The entire std C++ isn't supported/tested. In this case I'd say the issue is likely either stack size or free heap, but it could be some dependency as well, such as RTTI which we don't have.

[Gei0r]

Well ok I rewrote the code to not use regexes, but it's not ideal. Is there a way to get closer the the particular problem in this case?

[devyte]

I'm for getting as close to standard as possible, so if you could pursue this it would be great.
As I mentioned above, there are two avenues to investigate that come to mind: heap/stack usage, and whether regex somehow requires RTTI.
Maybe @earlephilhower has some ideas how to pursue this?

[earlephilhower]

It was done before I came onboard, but IIRC the RTTI is disabled in the toolchain because it inflates the code size and adds bytes to every C++ object.

Theoretically, it's just a switch that needs to be enabled on the g++ toolchain (not just the IDE platform.txt, but the libstdc++ compilation in the esp-quick-toolchain).

[Gei0r]

I haven't looked into it further, but I don't think that RTTI is the problem. Can't imagine why compiling a regex object would have anything to do with RTTI.

[earlephilhower]

Yes, it doesn't look like a RTTI issue on second glance a little later. What it does look like is a memory error generating the regex parse tree. Your attached crash dump is with exceptions enabled. Without exceptions enabled, I get abort() called from esp8266/tools/xtensa-lx106-elf/xtensa-lx106-elf/include/c++/4.8.2/bits/regex_compiler.h line 974:

  template<typename _InIter, typename _TraitsT>
    bool
    _Compiler<_InIter, _TraitsT>::
    _M_bracket_expression()
    {
      if (_M_match_token(_ScannerT::_S_token_bracket_begin))
        {
          _RMatcherT __matcher(_M_match_token(_ScannerT::_S_token_line_begin),
                               _M_traits);
          if (!_M_bracket_list(__matcher)
              || !_M_match_token(_ScannerT::_S_token_bracket_end))
>>>>            __throw_regex_error(regex_constants::error_brack);
          _M_stack.push(_StateSeq(_M_state_store,
                                  _M_state_store._M_insert_matcher(__matcher)));
          return true;
        }
      return false;
    }

And on further investigation, GCC 4.8 does not support regex properly : https://stackoverflow.com/questions/12530406/is-gcc-4-8-or-earlier-buggy-about-regular-expressions

If you're adventurous, check out my GCC 7.2 PR #6267 . It might get your regex running.

Closing as this is a known issue in gcc 4.8...

[earlephilhower]

After much hacking, std::regex can compile at runtime with the latest GCC 9.1 pre-release, and I can probably backport the changes fo the existing 4.8 GCC.

You can give your app a try with PR #6294 if you want to do further experiments.

[Gei0r]

Wow, amazing. I'll give it a try on the weekend.