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8.7

how to solve yacc if else shift/reduce problem

Asked by fabytes in Parsers, C Programming Language

Tags: bison yacc

Hi, I have a rule defined as follow:

comando : IF '(' exp ')' comando parte_else
| WHILE '(' exp ')' comando
| FOR '(' exp '=' exp ';' exp ';' exp ')' comando
;

parte_else : ELSE comando
| /* empty */
;

It's a more then famous shift/reduce problem, but the weird thing is that in my output is says the reduce is the default action, when I want to shift. I was told that bison would make shift default. How do I fix it?

grammar.output:

state 213

63 comando: IF '(' exp ')' comando .
64 | IF '(' exp ')' comando . ELSE comando

ELSE shift, and go to state 216

ELSE [reduce using rule 63 (comando)]
$default reduce using rule 63 (comando)

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how to solve yacc if else shift/reduce problem

Asked by fabytes in Parsers, C Programming Language

Tags: bison yacc

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