Bison_part1 - lethelog

Bison_part1

wliao posted @ Thu, 21 Apr 2011 17:26:43 +0800 in 未分类 , 1851 readers

I'm trying hard to learn compiler by reading the Dragon Book and manual of Bison. No previous experience in formal language and automate machine. It's pretty disappointing when understanding the theories. Get prepared for some projects I may come up later for practice. Goals: Understand the theories and read the yacc file of Swig. LR parse: a paser that read input from left to right, also termed as LR(k) where k refers to number of unconsumed "look ahead"(looking ahead a few more input items before making a cost effective decision) input symbols that are used in making parsing decisions. LALR: grammer which requires no more than one symbol of lookahead Bison: 1.Three ways for represent terminal symbols.

Token type defined in bison file.
one character literal
a C string constant

2.Semantic value: all the rest of the information about the meaning of the token. 3.Semantic actions: produce some output based on the input. The action is made up of C statements. 4.%glr-parse stands for GLR(Generalized LR) 5.Overall layout of a Bison grammar:

%{
Prologue
%}

Bison declarations

%%
Grammar rules
%%

Epilogue

No match

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