SIGSEGV when creating grammar.

[JeromSar]

Hi,

I've been expanding lispy (from your book, which is awesome, btw), to include support for doubles. However, when I finished my implementation, I suddenly get SIGSEGV errors when creating the grammar. Is there something I'm doing wrong?

I'm using the latest (master) version on the repo.

Grammar:

#define GRAMMAR "                                          \
                                                           \
      long     : /-?[0-9]+/ ;                              \
      double   : /-?[0-9]+\\.?[0-9]+/;                     \
      symbol   : /[a-zA-Z0-9_+\\-*\\/\\\\=<>!&\\|\\:]+/ ;  \
      string   : /\"(\\\\.|[^\"])*\"/ ;                    \
      comment  : /;[^\\r\\n]*/ ;                           \
      sexpr    : '(' <expr>* ')' ;                         \
      qexpr    : '{' <expr>* '}' ;                         \
      expr     : <number>  | <symbol> | <string>           \
               | <comment> | <sexpr>  | <qexpr> ;          \
      lispy    : /^/ <expr>* /$/ ;                         \
                                                           \
   "

static mpc_parser_t* number_l;
static mpc_parser_t* number_d;
static mpc_parser_t* symbol;
static mpc_parser_t* string;
static mpc_parser_t* comment;
static mpc_parser_t* sexpr;
static mpc_parser_t* qexpr;
static mpc_parser_t* expr;
static mpc_parser_t* lispy;

mpc_parser_t* grammar_create() {
  number_l = mpc_new("long");
  number_d = mpc_new("double");
  symbol = mpc_new("symbol");
  string = mpc_new("string");
  comment = mpc_new("comment");
  sexpr = mpc_new("sexpr");
  qexpr = mpc_new("qexpr");
  expr = mpc_new("expr");
  lispy = mpc_new("lispy");

  mpca_lang(MPCA_LANG_DEFAULT, GRAMMAR,  
    number_l, number_d, symbol, string, comment,
    sexpr, qexpr, expr, lispy);

  return lispy;
}

GDB backtrace:

Program received signal SIGSEGV, Segmentation fault.
0x74538eb4 in strcmp () from C:\WINDOWS\SysWOW64\msvcrt.dll
(gdb) backtrace
#0  0x74538eb4 in strcmp () from C:\WINDOWS\SysWOW64\msvcrt.dll
#1  0x0040de42 in mpca_grammar_find_parser ()
#2  0x0040de74 in mpcaf_grammar_id ()
#3  0x004081f5 in mpc_parse_apply_to ()
#4  0x00408607 in mpc_parse_run ()
#5  0x00408d22 in mpc_parse_run ()
#6  0x00408e6d in mpc_parse_run ()
#7  0x00408a66 in mpc_parse_run ()
#8  0x00408e6d in mpc_parse_run ()
#9  0x00408e6d in mpc_parse_run ()
#10 0x0040891a in mpc_parse_run ()
#11 0x004086d8 in mpc_parse_run ()
#12 0x00408e6d in mpc_parse_run ()
#13 0x00408e6d in mpc_parse_run ()
#14 0x004085db in mpc_parse_run ()
#15 0x00408feb in mpc_parse_input ()
#16 0x0040e8df in mpca_lang_st ()
#17 0x0040ea59 in mpca_lang ()
#18 0x00403e5c in grammar_create ()
#19 0x00401451 in main ()
(gdb)

[JeromSar]

Nevermind, I got it working. Thanks anyway :)

[yrizk]

mind telling us what the issue was? I'm running to the same error on linux.

[yrizk]

actually, i figured out my issue. it was that the grammar and the variables were not the same. see issue#8