Ch4c - 1 Syntax Analysis Part III Chapter 4 COP5621...

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1 Syntax Analysis Part III Chapter 4 COP5621 Compiler Construction Copyright Robert van Engelen, Florida State University, 2007-2011
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2 ANTLR, Yacc, and Bison ANTLR tool – Generates LL( k ) parsers Yacc (Yet Another Compiler Compiler) – Generates LALR(1) parsers Bison – Improved version of Yacc
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3 Creating an LALR(1) Parser with Yacc/Bison Yacc or Bison compiler yacc specification yacc.y y.tab.c input stream C compiler a.out output stream y.tab.c a.out
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4 Yacc Specification A yacc specification consists of three parts: yacc declarations, and C declarations within %{ %} %% translation rules %% user-defined auxiliary procedures The translation rules are productions with actions: production 1 { semantic action 1 } production 2 { semantic action 2 } production n { semantic action n }
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5 Writing a Grammar in Yacc Productions in Yacc are of the form Nonterminal : tokens/nonterminals { action } | tokens/nonterminals { action } ; Tokens that are single characters can be used directly within productions, e.g. ‘+’ Named tokens must be declared first in the declaration part using %token TokenName
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