[英]LEX: segmentation fault : 11
我有一个独立的(意味着尚未与YACC关联的)LEX程序。 并且可以编译。 但是当我运行它时,出现如下错误消息:
细分错误:11
成功读取多个链接后,会发生此错误消息。
您能帮我解决这个问题吗?
谢谢!
码:
%{
#include <strings.h>
typedef int YYSTYPE;
extern YYSTYPE yylval;
int check;
int dummy;
int val1;
int val2;
char *net_name;
int fanouts;
int fanins;
char *net_name;
char *GATE_ASCI;
char *GATE_TYPE;
char *from;
int fan_net;
%}
%start A B C D E F
NET_NAME [0-9]
ASCI_GATE [0-9a-zA-Z]+
SOURCE_GATE_TYPE [a-zA-Z]+
NUM_FANOUTS [0-9]
NUM_FANINS [0-9]
INPUT_LIST_1 [0-9]
INPUT_LIST_2 [0-9]
SPACE [ \t\n]+
FAN_NET [0-9a-zA-Z]+
DIGITS [0-9]
character [a-zA-Z]+
%%
"*".*\n {
BEGIN A;
//yylval.string = strdup(yytext);
/*printf("I am here in comments \n");*/
//return(COMMENT);
}
<A>{NET_NAME} {
BEGIN B;
net_name = strdup(yytext);
/* yylval.number = atoi(yytext);*/
printf("%s",net_name);
}
<B>{ASCI_GATE} {
BEGIN C;
GATE_ASCI = strdup(yytext);
printf("%s", GATE_ASCI);
}
<C>{SOURCE_GATE_TYPE} {
check = find_gate_type(yytext);
if (check != 0) {
BEGIN D;
GATE_TYPE = strdup(yytext);
printf("%s", GATE_TYPE);
}
else {
/* printf("I am here in From \n"); */
BEGIN E;
from = strdup(yytext);
printf("%s", from);
}
}
<D>{NUM_FANOUTS}{SPACE}{NUM_FANINS} {
/* printf("NUM_FANOUTS NUM_FANINS\t");*/
fanouts = atoi(&yytext[0]);
fanins = atoi(&yytext[2]);
printf("%d %d",fanouts, fanins);
/*BEGIN F;*/
/*yylval.number = atoi(yytext);*/
/* printf("I am here in Fanout \n");*/
BEGIN A;
}
<E>{FAN_NET} {
BEGIN A;
fan_net = strdup(yytext);
printf("%s", fan_net);
}
<F>{DIGITS} {
BEGIN A;
val1 = atoi(&yytext[0]);
val2 = atoi(&yytext[1]);
printf("%d %d",val1, val2);
}
">sa"[0-1] {
printf("%s", yytext);
}
%%
find_gate_type(char *string_pass){
char *string_cmp = "from";
if(strcmp(string_pass, string_cmp) == 0) {
/* printf("I am here in FROM FUNCTION \n"); */
return 0;
}
else{
return 1;
}
}
int main(int argc, char *argv[]){
//int argc;
//char **argv;
if (argc > 1) {
FILE *file;
file = fopen(argv[1], "r");
if (!file) {
fprintf(stderr,"could not open %s\n",argv[1]);
} else {
printf("reading\n");
yyin = file;
}
yylex();
return 0;
/* fclose(file);*/
}
}
int yywrap(void)
{
return 1;
}
如建议的那样,编译器警告是开始的地方:
$ gcc -Wall -c lex.yy.c 2>&1 |sed -e 's/^/ /'
foo.l: In function ‘yylex’:
foo.l:42:3: warning: implicit declaration of function ‘strdup’ [-Wimplicit-function-declaration]
foo.l:42:14: warning: incompatible implicit declaration of built-in function ‘strdup’ [enabled by default]
foo.l:51:15: warning: incompatible implicit declaration of built-in function ‘strdup’ [enabled by default]
foo.l:57:3: warning: implicit declaration of function ‘find_gate_type’ [-Wimplicit-function-declaration]
foo.l:60:19: warning: incompatible implicit declaration of built-in function ‘strdup’ [enabled by default]
foo.l:68:15: warning: incompatible implicit declaration of built-in function ‘strdup’ [enabled by default]
foo.l:90:14: warning: incompatible implicit declaration of built-in function ‘strdup’ [enabled by default]
foo.l:90:12: warning: assignment makes integer from pointer without a cast [enabled by default]
foo.l:91:3: warning: format ‘%s’ expects argument of type ‘char *’, but argument 2 has type ‘int’ [-Wformat]
lex.yy.c: In function ‘yy_init_buffer’:
lex.yy.c:1253:5: warning: implicit declaration of function ‘isatty’ [-Wimplicit-function-declaration]
foo.l: At top level:
foo.l:108:3: warning: return type defaults to ‘int’ [-Wreturn-type]
foo.l: In function ‘find_gate_type’:
foo.l:111:5: warning: implicit declaration of function ‘strcmp’ [-Wimplicit-function-declaration]
foo.l: At top level:
lex.yy.c:1048:1: warning: ‘yyunput’ defined but not used [-Wunused-function]
lex.yy.c:1089:1: warning: ‘input’ defined but not used [-Wunused-function]
foo.l: In function ‘main’:
foo.l:140:4: warning: control reaches end of non-void function [-Wreturn-type]
地址不正确的strings.h
使用标准string.h
减少了问题:
$ gcc -Wall -c lex.yy.c 2>&1 |sed -e 's/^/ /'
foo.l: In function ‘yylex’:
foo.l:57:3: warning: implicit declaration of function ‘find_gate_type’ [-Wimplicit-function-declaration]
foo.l:90:12: warning: assignment makes integer from pointer without a cast [enabled by default]
foo.l:91:3: warning: format ‘%s’ expects argument of type ‘char *’, but argument 2 has type ‘int’ [-Wformat]
lex.yy.c: In function ‘yy_init_buffer’:
lex.yy.c:1253:5: warning: implicit declaration of function ‘isatty’ [-Wimplicit-function-declaration]
foo.l: At top level:
foo.l:108:3: warning: return type defaults to ‘int’ [-Wreturn-type]
lex.yy.c:1048:1: warning: ‘yyunput’ defined but not used [-Wunused-function]
lex.yy.c:1089:1: warning: ‘input’ defined but not used [-Wunused-function]
foo.l: In function ‘main’:
foo.l:140:4: warning: control reaches end of non-void function [-Wreturn-type]
编译器指出,为fan_type
分配了strdup
的结果(但将其声明为整数),然后在printf
语句中将其用作字符串。
使用调试器(我更喜欢valgrind
),您可能会发现需要修复的其他内容,但是编译器警告是首选的起点。
顺便说一句, -Wall
(再次)是一个起点。 我通常使用脚本来应用更多选项,例如,我在getopt中提到gcc-normal
不适用于一个参数
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