May 2024
Intermediate to advanced
536 pages
17h 10m
English
Content preview from Compilers: Principles and Practice by Pearson
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158 Compilers – Principles and Practice
A typical case of circular dependency is given below:
Production Semantic rules
A -> B A.synth = B.inher
B.inher = A.syth + 1
5.4.7 Synthesized and Inherited Attributes in yacc
The yacc example we considered in Section 5.2.1 used synthesized attributes. At any point in a syntax
tree, we can determine the attributes of a node based on the attributes of its children. Consider the rule
expr: expr ’+’ expr { $$ = $1 + $3; }
Since we are parsing bottom-up, the attributes of both the operands are available, and yacc can
determine the value associated with the left-hand side.
An inherited attribute of a node depends ...
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