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Windows에서 FLEX를 사용하여 어휘 분석기를 작성하려고합니다. 아이디어가flex에서 yylval을 사용하는 방법
%option noyywrap
%{
#include<stdio.h>
#include<stdlib.h>
#include "tokens.h"
int nline = 1;
int size_token_array = 100;
int number_of_tokens_in_array = 0;
int inc_token_array = 50;
token *token_store ;
extern yylval;
%}
delim [ \t]
delim_nl [\n]
ws {delim}+
nl {delim_nl}+
letter [a-z]
digit [0-9]
id {letter}(letter.digit)*
int_num (0|([+-]?([1-9]{digit}*)))
real_num [+-]?{digit}+(\.{digit}+)
rel_op ">"|"<"|"<="|">="|"=="|"!="
binary_ar_op "+"|"-"|"*"|"/"|"="
task_id {letter}(letter+digit)*
signal_id {letter}(letter+digit)*
%%
"parbegin" {create_and_store_token(TOKEN_PARBEGIN,yytext,nline); return 1;}
"parend" {create_and_store_token(TOKEN_PAREND,yytext,nline); return 1;}
"task" {create_and_store_token(TOKEN_TASK,yytext,nline); return 1;}
"{" {create_and_store_token('{',yytext,nline); return 1;}
"}" {create_and_store_token('}',yytext,nline); return 1;}
"begin" {create_and_store_token(TOKEN_BEGIN,yytext,nline); return 1;}
"end" {create_and_store_token(TOKEN_END,yytext,nline); return 1;}
"integer" {create_and_store_token(TOKEN_INTEGER,yytext,nline); return 1;}
"real" {create_and_store_token(TOKEN_REAL,yytext,nline); return 1;}
"||" {create_and_store_token(TOKEN_PARALLEL,yytext,nline); return 1;}
";" {create_and_store_token(';',yytext,nline); return 1;}
"," {create_and_store_token(',',yytext,nline); return 1;}
"do" {create_and_store_token(TOKEN_DO,yytext,nline); return 1;}
"until" {create_and_store_token(TOKEN_UNTIL,yytext,nline); return 1;}
"od" {create_and_store_token(TOKEN_OD,yytext,nline); return 1;}
"send" {create_and_store_token(TOKEN_SEND,yytext,nline); return 1;}
"accept" {create_and_store_token(TOKEN_ACCEPT,yytext,nline); return 1;}
"(" {create_and_store_token('(',yytext,nline); return 1;}
")" {create_and_store_token(')',yytext,nline); return 1;}
"<" {create_and_store_token(LT,yytext,nline); yylval=rel_op; return 1;}
">" {create_and_store_token(GT,yytext,nline); yylval=rel_op; return 1;}
"<=" {create_and_store_token(LE,yytext,nline); yylval=rel_op; return 1;}
">=" {create_and_store_token(GE,yytext,nline); yylval=rel_op; return 1;}
"==" {create_and_store_token(EQ,yytext,nline); yylval=rel_op; return 1;}
"!=" {create_and_store_token(NE,yytext,nline); yylval=rel_op; return 1;}
"*" {create_and_store_token('*',yytext,nline); yylval=binary_ar_op; return 1;}
"/" {create_and_store_token('/',yytext,nline); yylval=binary_ar_op; return 1;}
"+" {create_and_store_token('+',yytext,nline); yylval=binary_ar_op; return 1;}
"-" {create_and_store_token('-',yytext,nline); yylval=binary_ar_op; return 1;}
"=" {create_and_store_token('=',yytext,nline); yylval=binary_ar_op; return 1;}
{ws} ;
{nl} nline++;
id {create_and_store_token(TOKEN_ID,yytext,nline); return 1;}
int_num {create_and_store_token(TOKEN_INT_NUM,yytext,nline); return 1;}
real_num {create_and_store_token(TOKEN_REAL_NUM,yytext,nline); return 1;}
binary_ar_op {create_and_store_token(TOKEN_AR_OP,yytext,nline); return 1;}
"task_id" {create_and_store_token(TOKEN_TASK_ID,yytext,nline); return 1;}
"signal_id" {create_and_store_token(TOKEN_SIGNAL_ID,yytext,nline); return 1;}
%%
int main()
{
token_store = (token*)calloc(size_token_array,sizeof(token));
free(token_store);
return 0;
}
void create_and_store_token(int token_type,char* token_lexeme,int line_number){
token new_token;
new_token.ivalue = token_type;
new_token.lexema = token_lexeme;
new_token.line_number = line_number;
if(size_token_array == (number_of_tokens_in_array-10)){
token_store = (token*)realloc(token_store,inc_token_array*sizeof(token));
size_token_array+=inc_token_array;
number_of_tokens_in_array++;
token_store[number_of_tokens_in_array]= new_token;
}
else{
token_store[number_of_tokens_in_array]= new_token;
number_of_tokens_in_array++;
}
}
int nextToken(){
return yylex();
}
void backToken(){
token_store[number_of_tokens_in_array].ivalue = 0;
token_store[number_of_tokens_in_array].lexema = "";
token_store[number_of_tokens_in_array].line_number = 0;
number_of_tokens_in_array--;
}
누구 나는이 문제를 어떻게 해결해야
"undefined reference to `yylval'"
내가 다음과 같이 모든 정의가 이루어되는 extern 형 최대로하는 yylval 선언 : 는 항상 오류를 받고 있어요?