Bison_part1 - lethelog

Bison_part1

wliao posted @ Thu, 21 Apr 2011 17:26:43 +0800 in 未分类 , 1825 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

Comments (3)

[Reply]

meidir said:
Thu, 21 Jul 2022 19:30:46 +0800

You completed a number of nice points there. I did a search on the issue and found nearly all people will have the same opinion with your blog. 攝影器材

[Reply]

meidir said:
Wed, 24 Aug 2022 19:13:40 +0800

We’ll things such take another look at to two styles of users: newly released Zune vendors who will be making plans for an upgrade, and the ones doing this to come to the conclusion between a Microsoft zune plus an ipod touch. (A lot more professionals worthwhile considering available to choose from, which include the The new sony Personal stereo Times, however This particular this supplies you sufficient research to get the best idea from Zune instead of masters as apposed to the iPod brand similar.) skin care

[Reply]

meidir said:
Wed, 24 Aug 2022 23:25:37 +0800

I do believe this is an educational post and it's very helpful and knowledgeable. therefore, I wish to thanks for the efforts you have manufactured in writing this article. 안마야