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weltling / parle

Parser and lexer for PHP
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Request: Throw exception instead of crashing #33

Closed vike2000 closed 1 year ago

vike2000 commented 1 year ago

Addendum edit:

I would like to get a php exception thrown instead of a crash.

Talking with BenHanson below it looks like the crash happens because I am

trying to pop from an empty stack

Original post (sort of):

I am running it locally (w/ major scripting in php and bash(1),  via vscode (step-debug - both php/xdebug and c++/lldb - setup in .vscode but using external personal toolchain)  or just bash in iterm from where the following crash comes - via macOS.

It crashes in std::__1::stack and "my" call after entry (from php) being parsertl::lookup(par.sm, lex.iter, par.results, par.productions) of parle.cpp afaics:

Process:               php74 [69811]
Path:                  /opt/local/bin/php74
Identifier:            php74
Version:               0
Code Type:             X86-64 (Native)
Parent Process:        bash [69807]
Responsible:           php74 [69811]
User ID:               501

Date/Time:             2023-04-30 14:26:14.168 +0200
OS Version:            Mac OS X 10.13.6 (17G14042)
Report Version:        12
Anonymous UUID:        68AD1302-B017-10AE-5B0E-65788163B8B6

Time Awake Since Boot: 720000 seconds

System Integrity Protection: enabled

Crashed Thread:        0  Dispatch queue: com.apple.main-thread

Exception Type:        EXC_BAD_ACCESS (SIGSEGV)
Exception Codes:       EXC_I386_GPFLT
Exception Note:        EXC_CORPSE_NOTIFY

Termination Signal:    Segmentation fault: 11
Termination Reason:    Namespace SIGNAL, Code 0xb
Terminating Process:   exc handler [0]

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   parle.so                        0x000000010d401a2f std::__1::deque<std::__1::pair<unsigned short, unsigned short>, std::__1::allocator<std::__1::pair<unsigned short, unsigned short> > >::back() + 63 (deque:1804)
1   parle.so                        0x000000010d401975 std::__1::stack<std::__1::pair<unsigned short, unsigned short>, std::__1::deque<std::__1::pair<unsigned short, unsigned short>, std::__1::allocator<std::__1::pair<unsigned short, unsigned short> > > >::top() + 21 (stack:195)
2   parle.so                        0x000000010d401556 void lexertl::detail::lookup_state<lexertl::detail::basic_internals<unsigned short>, unsigned short, unsigned char, 127ul>::pop<lexertl::recursive_match_results<std::__1::__wrap_iter<char const*>, unsigned short, 127ul> >(lexertl::recursive_match_results<std::__1::__wrap_iter<char const*>, unsigned short, 127ul>&, std::__1::integral_constant<bool, true> const&) + 54 (lookup.hpp:310)
3   parle.so                        0x000000010d40100e void lexertl::detail::next<lexertl::basic_state_machine<char, unsigned short>, 127ul, lexertl::recursive_match_results<std::__1::__wrap_iter<char const*>, unsigned short, 127ul>, false, true>(lexertl::basic_state_machine<char, unsigned short> const&, lexertl::recursive_match_results<std::__1::__wrap_iter<char const*>, unsigned short, 127ul>&, std::__1::integral_constant<bool, false> const&, std::__1::integral_constant<bool, true> const&, std::__1::forward_iterator_tag const&) + 510 (lookup.hpp:429)
4   parle.so                        0x000000010d400e01 void lexertl::lookup<std::__1::__wrap_iter<char const*>, lexertl::basic_state_machine<char, unsigned short>, 127ul>(lexertl::basic_state_machine<char, unsigned short> const&, lexertl::recursive_match_results<std::__1::__wrap_iter<char const*>, lexertl::basic_state_machine<char, unsigned short>::id_type, 127ul>&) + 145 (lookup.hpp:488)
5   parle.so                        0x000000010d400b31 parle::lexer::iterator<std::__1::__wrap_iter<char const*>, lexertl::basic_state_machine<char, unsigned short>, lexertl::recursive_match_results<std::__1::__wrap_iter<char const*>, unsigned short, 127ul>, parle::lexer::rlexer, parle::lexer::token_cb, unsigned short>::lookup() + 145 (iterator.hpp:136)
6   parle.so                        0x000000010d4439e9 parle::lexer::iterator<std::__1::__wrap_iter<char const*>, lexertl::basic_state_machine<char, unsigned short>, lexertl::recursive_match_results<std::__1::__wrap_iter<char const*>, unsigned short, 127ul>, parle::lexer::rlexer, parle::lexer::token_cb, unsigned short>::operator++() + 25 (iterator.hpp:85)
7   parle.so                        0x000000010d44557b void parsertl::lookup<parsertl::basic_state_machine<unsigned short>, parle::lexer::iterator<std::__1::__wrap_iter<char const*>, lexertl::basic_state_machine<char, unsigned short>, lexertl::recursive_match_results<std::__1::__wrap_iter<char const*>, unsigned short, 127ul>, parle::lexer::rlexer, parle::lexer::token_cb, unsigned short>, std::__1::vector<parsertl::token<parle::lexer::iterator<std::__1::__wrap_iter<char const*>, lexertl::basic_state_machine<char, unsigned short>, lexertl::recursive_match_results<std::__1::__wrap_iter<char const*>, unsigned short, 127ul>, parle::lexer::rlexer, parle::lexer::token_cb, unsigned short> >, std::__1::allocator<parsertl::token<parle::lexer::iterator<std::__1::__wrap_iter<char const*>, lexertl::basic_state_machine<char, unsigned short>, lexertl::recursive_match_results<std::__1::__wrap_iter<char const*>, unsigned short, 127ul>, parle::lexer::rlexer, parle::lexer::token_cb, unsigned short> > > > >(parsertl::basic_state_machine<unsigned short> const&, parle::lexer::iterator<std::__1::__wrap_iter<char const*>, lexertl::basic_state_machine<char, unsigned short>, lexertl::recursive_match_results<std::__1::__wrap_iter<char const*>, unsigned short, 127ul>, parle::lexer::rlexer, parle::lexer::token_cb, unsigned short>&, parsertl::basic_match_results<parsertl::basic_state_machine<unsigned short> >&, std::__1::vector<parsertl::token<parle::lexer::iterator<std::__1::__wrap_iter<char const*>, lexertl::basic_state_machine<char, unsigned short>, lexertl::recursive_match_results<std::__1::__wrap_iter<char const*>, unsigned short, 127ul>, parle::lexer::rlexer, parle::lexer::token_cb, unsigned short> >, std::__1::allocator<parsertl::token<parle::lexer::iterator<std::__1::__wrap_iter<char const*>, lexertl::basic_state_machine<char, unsigned short>, lexertl::recursive_match_results<std::__1::__wrap_iter<char const*>, unsigned short, 127ul>, parle::lexer::rlexer, parle::lexer::token_cb, unsigned short> > > >&) + 283 (lookup.hpp:103)
8   parle.so                        0x000000010d390391 void _parser_advance<ze_parle_rparser_obj>(_zend_execute_data*, _zval_struct*, _zend_class_entry*) + 625 (parle.cpp:1089)
9   parle.so                        0x000000010d390114 zim_ParleRParser_advance(_zend_execute_data*, _zval_struct*) + 36 (parle.cpp:1106)
10  php74                           0x0000000109499bd1 execute_internal + 49
11  xdebug.so                       0x000000010c405d01 xdebug_execute_internal + 705
12  php74                           0x00000001094ddd4d ZEND_DO_FCALL_SPEC_RETVAL_UNUSED_HANDLER + 765
13  php74                           0x000000010949b1c4 execute_ex + 100
14  xdebug.so                       0x000000010c4058e1 xdebug_execute_ex + 1681
15  php74                           0x000000010949b3fb zend_execute + 283
16  php74                           0x0000000109407fbf zend_eval_stringl + 623
17  php74                           0x0000000109408241 zend_eval_stringl_ex + 49
18  php74                           0x00000001094082d3 zend_eval_string_ex + 67
19  php74                           0x0000000109546c39 do_cli + 3753
20  php74                           0x0000000109545ba5 main + 1909
21  libdyld.dylib                   0x00007fff587fc015 start + 1

Thread 0 crashed with X86 Thread State (64-bit):
  rax: 0x0000000000000000  rbx: 0x0000000000000000  rcx: 0x00007f94c2c79c80  rdx: 0x00007ffee6c61340
  rdi: 0x003fffffffffffff  rsi: 0x00007f94c2c791e8  rbp: 0x00007ffee6c61260  rsp: 0x00007ffee6c61240
   r8: 0x00007f94c2c79063   r9: 0x00007ffee6c61310  r10: 0x000000000000ffff  r11: 0x00007f94c2c00000
  r12: 0x0000000000000000  r13: 0x0000000000000000  r14: 0x0000000000000000  r15: 0x0000000000000000
  rip: 0x000000010d401a2f  rfl: 0x0000000000010217  cr2: 0x000000010d446000

Logical CPU:     2
Error Code:      0x00000000
Trap Number:     13

Binary Images:
       0x108f98000 -        0x109be3fff +php74 (0) <B555CFE6-BDF5-3E51-AFD2-0572AB820A3D> /opt/local/bin/php74
       0x109e87000 -        0x109e8efff +libargon2.1.dylib (0) <C86A87E6-EA82-35DD-8429-7B38DD33DB0B> /opt/local/lib/libargon2.1.dylib
       0x109e9a000 -        0x109ebffff +libreadline.8.dylib (0) <F47B7A3A-F038-3079-8F7C-A9C1AE76AE8B> /opt/local/lib/libreadline.8.dylib
       0x109ede000 -        0x109f1bff3 +libncurses.6.dylib (0) <27F27013-CCAE-31E1-BA8F-4B8B76C33D90> /opt/local/lib/libncurses.6.dylib
       0x109f30000 -        0x109f31ffb +libcom_err.1.1.dylib (0) <FCC90B4B-759D-32B2-8852-CBDB0A0A8EF9> /opt/local/lib/libcom_err.1.1.dylib
       0x109f34000 -        0x109f44fff +libbz2.1.0.dylib (0) <D2D8E1EA-913D-3B8B-982F-52B903F53F11> /opt/local/lib/libbz2.1.0.dylib
       0x109f50000 -        0x10a033fff +libxml2.2.dylib (0) <1FE45863-64B7-3D7E-AB01-864F15219A2C> /opt/local/lib/libxml2.2.dylib
       0x10a06d000 -        0x10a0edff7 +libpcre2-8.0.dylib (0) <D5FB73C7-0CC0-31CF-B448-C877A9568059> /opt/local/lib/libpcre2-8.0.dylib
       0x10a0fa000 -        0x10a10afff +libz.1.dylib (0) <3C9485F9-4437-3696-A0AE-D77C0CF6841A> /opt/local/lib/libz.1.dylib
       0x10a113000 -        0x10a29cffb +libicui18n.67.dylib (0) <A8F400F0-64F9-39F1-BAE2-618EB31FF6E7> /opt/local/lib/libicui18n.67.dylib
       0x10a3af000 -        0x10a4cefff +libicuuc.67.dylib (0) <A41B17F5-2865-3CAA-97CF-15C3A6BD46EE> /opt/local/lib/libicuuc.67.dylib
       0x10a549000 -        0x10c05efff +libicudata.67.dylib (0) <AB92F086-9D87-3A72-B4FD-950F2B45B312> /opt/local/lib/libicudata.67.dylib
       0x10c063000 -        0x10c07eff7 +liblzma.5.dylib (0) <000AFF62-46CA-318C-B5E9-4716D06BC3DC> /opt/local/lib/liblzma.5.dylib
       0x10c08a000 -        0x10c18aff3 +libiconv.2.dylib (0) <6A6F7404-D117-3D83-AFB3-96D7E614BF07> /opt/local/lib/libiconv.2.dylib
       0x10c1bb000 -        0x10c1d9ff7 +curl.so (0) <5D742004-6F3D-3A8A-9283-CF1AD991D47A> /opt/local/lib/*/curl.so
       0x10c1e1000 -        0x10c1f1fff +libpsl.5.dylib (0) <C3E6C0A4-BA1C-30EE-9C15-2A6E61DA76F8> /opt/local/lib/libpsl.5.dylib
       0x10c1f4000 -        0x10c1faff3 +libkrb5support.1.1.dylib (0) <2E7B094C-C887-39CB-B706-9B80E1C736C8> /opt/local/lib/libkrb5support.1.1.dylib
       0x10c400000 -        0x10c45affb +xdebug.so (0) <A4AE2A12-F047-328E-B600-09BE0BC69BAC> /opt/local/lib/*/xdebug.so
       0x10c471000 -        0x10c4d1ffb +libcurl.4.dylib (0) <DCADF016-E700-3C97-983C-739CA6028293> /opt/local/lib/libcurl.4.dylib
       0x10c4e6000 -        0x10c542ffb +libssl.3.dylib (0) <4744E354-49FB-3BC5-82B5-54B3FF461835> /opt/local/libexec/*/libssl.3.dylib
       0x10c56e000 -        0x10c7d30d3 +libcrypto.3.dylib (0) <600DD66F-DE49-317B-8B20-CB39B896ADBF> /opt/local/libexec/*/libcrypto.3.dylib
       0x10c8df000 -        0x10c90cff7 +libidn2.0.dylib (0) <629FD4F1-CACD-3437-BFCB-A06F9A4E2E1C> /opt/local/lib/libidn2.0.dylib
       0x10c911000 -        0x10c9effe7 +libzstd.1.dylib (0) <79C2017C-A512-3D51-B770-80A275F40221> /opt/local/lib/libzstd.1.dylib
       0x10c9fb000 -        0x10cb87fff +libunistring.2.dylib (0) <3472EFFD-923B-3629-8145-8371C880B3CC> /opt/local/lib/libunistring.2.dylib
       0x10cb9c000 -        0x10cba5fff +libintl.8.dylib (0) <88CFFEE8-7A05-37E1-9EAA-993C6B5CDD51> /opt/local/lib/libintl.8.dylib
       0x10cbab000 -        0x10cbb4ffb +iconv.so (0) <8D35FD2B-7A68-3D8D-9B0B-C964CB618006> /opt/local/lib/*/iconv.so
       0x10cbb9000 -        0x10cc21fff +intl.so (0) <8747F6FA-55A1-378A-9758-7AAB8E363595> /opt/local/lib/*/intl.so
       0x10cc62000 -        0x10cc6afff +libicuio.67.dylib (0) <3088B213-3D2E-342E-B550-FEC2BFDA3773> /opt/local/lib/libicuio.67.dylib
       0x10cc71000 -        0x10cd6bff3 +mbstring.so (0) <31288DFB-B419-352D-98A6-9343B10446DD> /opt/local/lib/*/mbstring.so
       0x10cd8a000 -        0x10cdf9ff3 +libonig.5.dylib (0) <899499A1-A8BA-311A-872C-FF44B30E1A47> /opt/local/lib/libonig.5.dylib
       0x10ce11000 -        0x10ce35ff3 +openssl.so (0) <FC84A889-F41B-3432-9DF8-B0E7DA443F9A> /opt/local/lib/*/openssl.so
       0x10ce46000 -        0x10ce76ff3 +libgssapi_krb5.2.2.dylib (0) <AFB2CD8E-FECE-31C6-9950-31431065F1AF> /opt/local/lib/libgssapi_krb5.2.2.dylib
       0x10ce87000 -        0x10cf04ff7 +libkrb5.3.3.dylib (0) <3F97A701-563A-3C52-BFEF-72BAC81F6C71> /opt/local/lib/libkrb5.3.3.dylib
       0x10cf3a000 -        0x10cf46fff +libk5crypto.3.1.dylib (0) <EC9424CE-0D54-3347-ACF8-0E07F2852468> /opt/local/lib/libk5crypto.3.1.dylib
       0x10cf4c000 -        0x10cf9cff3 +libssl.1.1.dylib (0) <08005490-E4F5-363B-B7D8-5E28D37048F9> /opt/local/libexec/*/libssl.1.1.dylib
       0x10cfc5000 -        0x10d178d7f +libcrypto.1.1.dylib (0) <F3D35172-5B19-3C4A-B94B-E06022C1067E> /opt/local/libexec/*/libcrypto.1.1.dylib
       0x10d20a000 -        0x10d218ff7 +sodium.so (0) <4D8B5DF7-2F19-3055-8A38-FD0664E3FAE0> /opt/local/lib/*/sodium.so
       0x10d220000 -        0x10d25efe3 +libsodium.23.dylib (0) <29C70F33-CACA-3A26-AAF3-007754177F41> /opt/local/lib/libsodium.23.dylib
       0x10d26e000 -        0x10d277ff3 +sqlite3.so (0) <857BBC6A-0127-3CB7-A194-1A645A461F1C> /opt/local/lib/*/sqlite3.so
       0x10d27f000 -        0x10d35dff7 +libsqlite3.0.dylib (0) <A045FE66-1CF6-3C8B-A465-2754F3F7BA04> /opt/local/lib/libsqlite3.0.dylib
       0x10d37d000 -        0x10d383fff +pdo_sqlite.so (0) <BCC2514A-C543-361F-8349-D1FFE62F2525> /opt/local/lib/*/pdo_sqlite.so
       0x10d388000 -        0x10d45eff7 +parle.so (0) <36F83BA1-2369-3DA7-949C-D99A7BE84C88> /Users/USER/*/parle.so
       0x10d7e2000 -        0x10d7f0fff +legacy.dylib (0) <03D10CCA-8F19-39B2-B10D-67FF3675A936> /opt/local/libexec/*/legacy.dylib
       0x11495d000 -        0x1149a7adf  dyld (551.5) <CB9BFB56-4511-36F1-A546-891FF770C01C> /usr/lib/dyld
    0x7fff2ca5d000 -     0x7fff2ca5dfff  com.apple.Accelerate (1.11 - Accelerate 1.11) <2EF00EFE-06E8-3082-85C3-2988B422A19D> /System/Library/Frameworks/Accelerate.framework/Versions/A/Accelerate
    0x7fff2ca76000 -     0x7fff2d1c4ffb  com.apple.vImage (8.1 - ???) <56C275C1-459F-37CD-BF29-2E6D81C29E53> /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vImage.framework/Versions/A/vImage
    0x7fff2d1c5000 -     0x7fff2d365ff3  libBLAS.dylib (1211.50.2) <93259222-2D94-333D-A1EB-09C6FC4A64B4> /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libBLAS.dylib
    0x7fff2d366000 -     0x7fff2d3a0fef  libBNNS.dylib (38.1) <0AAE0109-71D5-3B26-8401-3E62DDF97624> /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libBNNS.dylib
    0x7fff2d3a1000 -     0x7fff2d77aff7  libLAPACK.dylib (1211.50.2) <70781D0B-AEAD-33EB-9900-10DC30F37D61> /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libLAPACK.dylib
    0x7fff2d77b000 -     0x7fff2d791ff7  libLinearAlgebra.dylib (1211.50.2) <FB5A35EA-D636-3D69-AB53-B67E1EB8134C> /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libLinearAlgebra.dylib
    0x7fff2d792000 -     0x7fff2d797ff3  libQuadrature.dylib (3) <E936BDAF-8492-34D9-8C5C-AFBFCDAD8318> /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libQuadrature.dylib
    0x7fff2d798000 -     0x7fff2d818fff  libSparse.dylib (79.50.2) <0DC25CDD-F8C1-3D6E-B472-8B060708424F> /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libSparse.dylib
    0x7fff2d819000 -     0x7fff2d82bff7  libSparseBLAS.dylib (1211.50.2) <994A7D7E-FA3B-3943-A59C-8150B9AF86BE> /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libSparseBLAS.dylib
    0x7fff2d82c000 -     0x7fff2d99ffe7  libvDSP.dylib (622.50.5) <4BF310F4-31A3-3DA5-80E4-7F8014AD380B> /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libvDSP.dylib
    0x7fff2d9a0000 -     0x7fff2da56fef  libvMisc.dylib (622.50.5) <88143A88-4FDE-35A1-85FE-54FF0C2A9E43> /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libvMisc.dylib
    0x7fff2da57000 -     0x7fff2da57fff  com.apple.Accelerate.vecLib (3.11 - vecLib 3.11) <880DEF40-389A-3F56-ACA1-B62A5BC57E59> /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/vecLib
    0x7fff2ebfb000 -     0x7fff2ebfbfff  com.apple.ApplicationServices (48 - 50) <2B5B76E7-0AB2-31F9-BE58-B963BF1EC2E8> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/ApplicationServices
    0x7fff2ebfc000 -     0x7fff2ec62fff  com.apple.ApplicationServices.ATS (377 - 445.5) <60176327-F757-308E-B61A-D43394E87CC5> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ATS.framework/Versions/A/ATS
    0x7fff2ecfb000 -     0x7fff2ee1dff7  libFontParser.dylib (222.1.9) <FFF2AC1A-D4D2-3AD3-BFF2-F3649ECB02AC> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ATS.framework/Versions/A/Resources/libFontParser.dylib
    0x7fff2ee1e000 -     0x7fff2ee69ff7  libFontRegistry.dylib (221.6) <30C6D1DE-C0E3-3447-A0EF-829443D95F0E> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ATS.framework/Versions/A/Resources/libFontRegistry.dylib
    0x7fff2efab000 -     0x7fff2efafff3  com.apple.ColorSyncLegacy (4.13.0 - 1) <04764FB2-22D8-36F0-9647-2D21562E28D5> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ColorSyncLegacy.framework/Versions/A/ColorSyncLegacy
    0x7fff2f04f000 -     0x7fff2f0a1ffb  com.apple.HIServices (1.22 - 625) <3C059A55-1409-373E-BF0B-C3299AFABDCF> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/HIServices.framework/Versions/A/HIServices
    0x7fff2f0a2000 -     0x7fff2f0b0fff  com.apple.LangAnalysis (1.7.0 - 1.7.0) <8BB267F4-D5AA-3D35-8269-1A3CEA054ACD> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/LangAnalysis.framework/Versions/A/LangAnalysis
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External Modification Summary:
  Calls made by other processes targeting this process:
    task_for_pid: 0
    thread_create: 0
    thread_set_state: 0
  Calls made by this process:
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    thread_create: 0
    thread_set_state: 0
  Calls made by all processes on this machine:
    task_for_pid: 919641
    thread_create: 0
    thread_set_state: 977

VM Region Summary:
ReadOnly portion of Libraries: Total=365.1M resident=0K(0%) swapped_out_or_unallocated=365.1M(100%)
Writable regions: Total=47.2M written=0K(0%) resident=0K(0%) swapped_out=0K(0%) unallocated=47.2M(100%)

                                VIRTUAL   REGION 
REGION TYPE                        SIZE    COUNT (non-coalesced) 
===========                     =======  ======= 
Kernel Alloc Once                    8K        2 
MALLOC                            36.7M       16 
MALLOC guard page                   32K        9 
Memory Tag 250                    2048K        2 
STACK GUARD                       56.0M        2 
Stack                             8192K        2 
VM_ALLOCATE (reserved)             192K        2         reserved VM address space (unallocated)
__DATA                            16.0M      230 
__FONT_DATA                          4K        2 
__LINKEDIT                       202.2M       46 
__TEXT                           162.9M      222 
__UNICODE                          560K        2 
shared memory                       12K        4 
===========                     =======  ======= 
TOTAL                            484.6M      528 
TOTAL, minus reserved VM space   484.4M      528 

Model: iMac11,2, BootROM 99.0.0.0.0, 2 processors, Intel Core i3, 3.2 GHz, 16 GB, SMC 1.64f5
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USB Device: USB 2.0 Bus
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USB Device: USB 2.0 Hub
USB Device: USB 2.0 Hub
USB Device: IR Receiver
USB Device: Built-in iSight
FireWire Device:
Thunderbolt Bus:
vike2000 commented 1 year ago

the effective php code that crashes, and though the whole ruleset/machine is probably highly incomplete, I can't say I see a clear reason for it to crash...

<?php 
$c='\\t';

$p=new \Parle\RParser;
$p -> token('ESCAPE');
$p -> token('ESCAPED');
$p -> push('start','ESCAPE');
$p -> build();

$l=new \Parle\RLexer;
$l -> pushState('stt_esc');
$l -> push('INITIAL','\\\\',1,'stt_esc');
$l -> push('stt_esc','.',1,'<');
$l -> build();

$p -> consume($c,$l);
$p -> advance();?>

I don't understand much of the c++ code, but looking through the crashing stack in vscode, it looks like most is in the parsertl/lexertl libs, so maybe this could be seen as an upstream issue (@BenHanson)...

vike2000 commented 1 year ago
more or less useless post now the following echoes true and doesn't crash. I still don't see the clear reason for the previous code to crash. ``` php $c='\\t'; $p=new \Parle\RParser; $p -> nonassoc('\'\\\''); $p -> token('ESCAPED'); $p -> push('start','esc'); $p -> push('esc','\'\\\\\' ESCAPED'); $p -> build(); $l=new \Parle\RLexer; $l -> pushState('stt_esc'); $l -> push('INITIAL','\\\\',$p -> tokenId('\'\\\''),'stt_esc'); $l -> push('stt_esc','.',$p -> tokenId('ESCAPED'),'<'); $l -> build(); $p -> consume($c,$l); echo((json_encode(\Parle\RParser::ACTION_ERROR == $p -> action)).PHP_EOL); $p -> advance(); ```
vike2000 commented 1 year ago
more or less useless post now one last php variant; as I clearly don't understand jack, I won't give any more examples until asked to, or should I understand something more real... the following echoes true and then crashes: ``` php $c='\\t'; $p=new \Parle\RParser; $p -> token("'\\'"); $p -> token('ESCAPED'); $p -> push('start','esc'); $p -> push('esc',"'\\' ESCAPED"); $p -> build(); $l=new \Parle\RLexer; $l -> pushState('stt_esc'); $l -> push('INITIAL',"\\\\",$p -> tokenId("'\\'"),'stt_esc'); $l -> push('stt_esc','.',$p -> tokenId('ESCAPED'),'<'); $l -> build(); $p -> consume($c,$l); echo((json_encode(\Parle\RParser::ACTION_SHIFT == $p -> action)).PHP_EOL); $p -> advance(); ```
BenHanson commented 1 year ago

the effective php code that crashes, and though the whole ruleset/machine is probably highly incomplete, I can't say I see a clear reason for it to crash...

<?php 
$c='\\t';

$p=new \Parle\RParser;
$p -> token('ESCAPE');
$p -> token('ESCAPED');
$p -> push('start','ESCAPE');
$p -> build();

$l=new \Parle\RLexer;
$l -> pushState('stt_esc');
$l -> push('INITIAL','\\\\',1,'stt_esc');
$l -> push('stt_esc','.',1,'<');
$l -> build();

$p -> consume($c,$l);
$p -> advance();?>

I don't understand much of the c++ code, but looking through the crashing stack in vscode, it looks like most is in the parsertl/lexertl libs, so maybe this could be seen as an upstream issue (@BenHanson)...

Hello, I am the author of lexertl and parsertl.

The problem is that you are doing a 'goto' state ('stt_esc') and then trying to pop from an empty stack with '<'.

If you do:

$l -> push('stt_esc','.',$p -> tokenId('ESCAPED'),'INITIAL');

instead then things will work as expected.

If you want to stack your states then you would do:

$l -> push('INITIAL',"\\\\",$p -> tokenId("'\\'"),'>stt_esc');

See "Recursive Rules" under http://benhanson.net/lexertl.html

vike2000 commented 1 year ago

Thank you very much @BenHanson for helping me get the states right. I have them working in a jison program that I now want to port to parle. I have written another program using parle (and looking as much as possible at your documentation) but ended up not using states as I never got them right.

My real issue, as I will now try to make more clear in the OP, is yet that I would like to have an explanatory exception thrown instead of just a crash, in the case I thanks to you now know is

trying to pop from an empty stack

Saying it now I realize that the parle side has to catch that c++ exception and transform it into a php exception any way, so you can't solve my issue with parle in lexertl alone, unless parle has some kind of general exception handling already prepared, hmm... Even if parle would catch an exception raised in lexertl, perhaps parle would be better to throw a PHP exception at some adequate point before calling lexertl in this case. You (and any possible contributors) of course do with exceptions as you see fit in lexertl.

While I realize I shouldn've pinged you for my main issue here I again thank you for helping me getting my states right.

vike2000 commented 1 year ago

For completeness. An example of a full working example, albeit small:

$c='\\t';

$p=new \Parle\RParser;
$p -> token('ESCAPE');
$p -> token('ESCAPED');
$p -> push('start',"ESCAPE ESCAPED");
$p -> build();

$l=new \Parle\RLexer;
$l -> pushState('stt_esc');
$l -> push('INITIAL','\\\\',$p -> tokenId('ESCAPE'),'>'.'stt_esc');
$l -> push('stt_esc','.',$p -> tokenId('ESCAPED'),'<');
$l -> build();

$p -> consume($c,$l);
echo var_export((\Parle\RParser::ACTION_SHIFT==$p -> action),true).PHP_EOL;
$p -> advance();
echo var_export((\Parle\RParser::ACTION_SHIFT==$p -> action),true).PHP_EOL;
$p -> advance();
echo var_export((\Parle\RParser::ACTION_REDUCE==$p -> action),true).PHP_EOL;
echo var_export(($p -> sigil(0)),true).PHP_EOL;
echo var_export(($p -> sigil(1)),true).PHP_EOL;

Outputs:

true
true
true
'\\'
't'

My bad usage and its crash is reintroduced by removing the '>'.

BenHanson commented 1 year ago

Thanks for the feedback, glad I could help.

Yes, crashing on an empty stack is pretty brutal. Just FYI, crashing dereferencing invalid iterators is acceptable in C++(!)

I have updated the C++ library to throw when attempting to pop from an empty stack. Anatol has added me as a collaborator so I have pushed that change to the repo. It appears that the code already does a php_parle_rethrow_from_cpp if parsertl::lookup() fails, so it should already work as you requested.

If you've got any other queries, I'm happy to answer them.