Segfault on mpca_lang instanciation #8
Description
Hi!
I've been working around the examples in the readme (which by the way are not really up to date), and buildyourownlisp. Updating mpc today lead me to get a segfault on my mpca_lang instanciation.
It seems to be a problem with a NULL pointer manipulation, but don't really have the time to dig in it right now, any clue?
example source
#include <stdio.h>
#include <stdlib.h>
#include "mpc.h"
int main(int argc, char** argv) {
mpc_parser_t *Expr = mpc_new("expr");
mpc_parser_t *Value = mpc_new("value");
mpc_parser_t *Maths = mpc_new("maths");
mpc_result_t result;
char* input = "123";
mpca_lang(MPCA_LANG_DEFAULT,
" \
expression : <value> ; \
value : /[0-9]+/ | <expression> ; \
maths : /^/ <expression> /$/ ; \
",
Expr, Value, Maths);
if (mpc_parse("input", input, Value, &result)) {
mpc_ast_print(result.output);
mpc_ast_delete(result.output);
} else {
mpc_err_print(result.error);
mpc_err_delete(result.error);
}
mpc_cleanup(3, Expr, Value, Maths);
}gdb session
(gdb) b main
Breakpoint 1 at 0x400dfc: file src/main.c, line 7.
(gdb) r
Starting program: /home/oleiade/Dev/Sandbox/C/config/./bin/debug/config
Breakpoint 1, main (argc=1, argv=0x7fffffffe148) at src/main.c:7
7 mpc_parser_t *Expr = mpc_new("expr");
(gdb) n
8 mpc_parser_t *Value = mpc_new("value");
(gdb)
9 mpc_parser_t *Maths = mpc_new("maths");
(gdb)
11 char* input = "123";
(gdb)
13 mpca_lang(MPCA_LANG_DEFAULT,
(gdb)
Program received signal SIGSEGV, Segmentation fault.
0x0000000000409e46 in mpca_grammar_find_parser (x=0x618c10 "expression", st=0x7fffffffdf40) at src/mpc.c:2886
2886 if (p->name && strcmp(p->name, x) == 0) { return p; }