ECLR-attributed grammar
Encyclopedia
ECLR-attributed grammars are a special type of attribute grammar
s. They are a variant of LR-attributed grammars where an equivalence relation on inherited attributes is used to optimize attribute evaluation. EC stands for equivalence class. Rie is based on ECLR-attributed grammars. They are a superset of LR-attributed grammar
s.
Attribute grammar
An attribute grammar is a formal way to define attributes for the productions of a formal grammar, associating these attributes to values. The evaluation occurs in the nodes of the abstract syntax tree, when the language is processed by some parser or compiler....
s. They are a variant of LR-attributed grammars where an equivalence relation on inherited attributes is used to optimize attribute evaluation. EC stands for equivalence class. Rie is based on ECLR-attributed grammars. They are a superset of LR-attributed grammar
LR-attributed grammar
LR-attributed grammars are a special type of attribute grammars. They allow the attributes to be evaluated on LR parsing. As a result, attribute evaluation in LR-attributed grammars can be incorporated conveniently in bottom-up parsing. zyacc is based on LR-attributed grammars...
s.
External links
- http://www.is.titech.ac.jp/~sassa/lab/rie-e.html
- M. Sassa, H. Ishizuka and I. Nakata: ECLR-attributed grammars: a practical class of LR-attributed grammars. Inf. Process. Lett. 24 (1987), 31–41.
- M. Sassa, H. Ishizuka and I. Nakata: Rie, a Compiler Generator Based on a One-pass-type Attribute Grammar. Software—practice and experience 25:3 (March 1995), 229–250.