May 2024
Intermediate to advanced
536 pages
17h 10m
English
Content preview from Compilers: Principles and Practice by Pearson
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Syntax Analyzer 123
If this grammar is input to YACC as such, it will result in:
yacc: 16 Shift/Reduce conflicts.
YACC allows such grammar, provided the precedence of the Terminals ‘+’, ‘−’, ‘*’, ‘/’ are
defined. Then it will use it to resolve the conflict. The modified grammar is:
%token IDENTIFIER
%left ’+’ ’-’
%left ’*’ ’/’
%%
expr : expr ’+’ expr
| expr ’-’ expr
| expr ’*’ expr
| expr ’/’ expr
| IDENTIFIER
;
%%
One may also use %right and/or %nonassoc.
4.4.7 Error Handling
YACC is usually used to develop a compiler and a compiler is almost always dealing with programs
with errors in them. (How many times is a typical program compiled before it ...
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