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LCL

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Introduction

The analysis and translation of an attribute grammar by the LIGA system may be influenced in various ways. For that purpose the user specifies certain options in the LIGA Control Language LCL. You can introduce options to the ELI system in a file ending in .ctl. A default is assumed for each option if it is not set or if no LCL specification is given. The denotations of the options are headed by a prefix indicating one of the liga phases the option mainly refers to. LCL has a simple, keyword-oriented syntax. Each keyword consists solely of upper-case letters and underscores. Comments are enclosed in '/*' and '*/', and must not be nested.

Options  ::=   ( Option ';' )*
Option   ::=   'EXPAND'  ':' ExpandOpts / 
               'ORDER'   ':' OrderOpts / 
               'OPTIM'   ':' OptimOpts

ExpandOpts  ::=  ExpandOpt  ',' ExpandOpts / ExpandOpt 
OrderOpts   ::=  OrderOpt   ',' OrderOpts / OrderOpt 
OptimOpts   ::=  OptimOpt   ',' OptimOpts / OptimOpt 
 
Expandopt   ::= 'INFO' / 'INCLUDINGS_SEPARATE' /
                'INCLUDING' 'ON' / 'INCLUDING' 'OFF'

OrderOpt    ::= 'PARTITION' Strategy / 'TOPOLOGICAL' Strategy / 
                'GRAPH' Type ( ident ) * / 
                'ARRANGE' arrangePart
Strategy    ::= 'EARLY' / 'LATE'
Type        ::= 'DIRECT_SYMBOL' / 'TRANSITIVE_SYMBOL' / 'INDUCED_SYMBOL' /
                'DIRECT_RULE' / 'TRANSITIVE_RULE' / 'INDUCED_RULE' /
                'PARTITIONED_RULE' / 'PARTITION' / 'VISIT_SEQUENCE'
arrangePart ::= 'AUTOMATICALLY' / 'FAST' /
                'FOR' 'SYMB' ident 'EVAL' ident 'BEFORE' ident /
                'IN' 'RULE' ident 'EVAL' ident '[' intval ']' '.' ident
                'BEFORE' ident '[' intval ']' '.' ident

OptimOpt    ::= 'OFF' / 'INFO' / 'MORE_GLOBALS' /
                'NO_VARIABLES' / 'NO_STACKS' / 'GROUPING' 'VARIABLE' /
                'ATTRSPEZ' Type ( symbname '[' ( ident ) + ']' ) *
symbname    ::= ident / 'ANYSYMBOL'
Type        ::= 'GLOBAL VAR' / 'GLOBAL STACK' / 'TREE_NODE' /
                'GROUP VAR' / 'GROUP STACK'


            Figure 1: Context-free grammar for LCL

The next four sections of this manual describe the detailed syntax and effects of the options.


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