Problem with bison 2.4.1
 

Hi,
Iam using fedora 11 version.

I have a problem with bison 2.4.1.
I am writing compiler for ADA programs

%token INTEGER_TOK 347

%left AND_TOK OR_TOK XOR_TOK
%left EQUAL_TOK NOT_EQUAL_TOK LESS_TOK GREATER_TOK LESS_EQUAL_TOK GREATER_EQUAL_TOK
%left PLUS_TOK MINUS_TOK
%left MULT_TOK DIVIDE_TOK MOD_TOK REM_TOK
%left DOUBLE_STAR_TOK ABS_TOK
%right NOT_TOK
%left UPLUS UMINUS
}%

unary_operator :
PLUS_TOK %prec UPLUS
{
if(trace) printf("Unary_operator 1\n");
$$.st_ptr=mknode1("adding_operator",NULL,mknode1("PLUS_TOK",NULL,NULL,NULL,NULL),NULL,NULL);
}
|MINUS_TOK %prec UMINUS
{
if(trace) printf("Unary_operator 2\n");
$$.st_ptr=mknode1("adding_operator",NULL,mknode1("MINUS_TOK",NULL,NULL,NULL,NULL),NULL,NULL);
}
;

Here %token is working.
But operator precedence relation is not working.

Operator precedence relation code is
%left AND_TOK OR_TOK XOR_TOK
%left EQUAL_TOK NOT_EQUAL_TOK LESS_TOK GREATER_TOK LESS_EQUAL_TOK GREATER_EQUAL_TOK
%left PLUS_TOK MINUS_TOK
%left MULT_TOK DIVIDE_TOK MOD_TOK REM_TOK
%left DOUBLE_STAR_TOK ABS_TOK
%right NOT_TOK
%left UPLUS UMINUS

is not working.

i believe this is a problem with bison.

For example

if give an operation

a:=2*3**2/9 mod 2+b*2 rem 2;

then first operation should be exponential operation
then multiplication. Instead it works in the order it is given.

How many sift-reduce conflicts bison reported? Have u look into the parse tree to see why?