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semantic_tutorial [2015/11/20 16:01] deva |
semantic_tutorial [2016/12/01 17:07] deva |
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| ==== Step 1: Preparation === | ==== Step 1: Preparation === | ||
| - | * In this tutorial we use the [[http://deva.web.elte.hu/compilers/lab/while-language.html|While language]]. It is possible to use your own lexer and parser. If you have not completed it, use [[http://deva.web.elte.hu/compilers/lab/parser.zip|this implementation]]. | + | * In this tutorial we use the [[http://deva.web.elte.hu/compilers/lab/while-language.html|While language]]. It is possible to use your own lexer and parser. If you have not completed it, use [[http://deva.web.elte.hu/compilers/parser.zip|this implementation]]. |
| * If you are working not with your own parser, please take the time to understand the grammar. | * If you are working not with your own parser, please take the time to understand the grammar. | ||
| * Look into the ''Parser.ih'' file. | * Look into the ''Parser.ih'' file. | ||
| * The function called ''lex'' asks the current line number from the parser and saves it into a field of the ''d_loc<nowiki>__</nowiki>'' attribute of the ''Parser'' class. Then it asks for the next token from the lexer and returns it to the parser. | * The function called ''lex'' asks the current line number from the parser and saves it into a field of the ''d_loc<nowiki>__</nowiki>'' attribute of the ''Parser'' class. Then it asks for the next token from the lexer and returns it to the parser. | ||
| * The line number information is used in the ''error'' function to print location information for error messages. | * The line number information is used in the ''error'' function to print location information for error messages. | ||
| - | * Make sure you can compile the parser and it accepts all the correct [[http://deva.web.elte.hu/compilers/lab/while-tests.zip|test files]] and rejects the lexical error ones. Try out the semantic error test cases! They are accepted. The goal of the tutorial is to find those errors as well. | + | * Make sure you can compile the parser and it accepts all the correct [[http://deva.web.elte.hu/compilers/while-tests.zip|test files]] and rejects the lexical error ones. Try out the semantic error test cases! They are accepted. The goal of the tutorial is to find those errors as well. |
| ==== Step 2: Symbol table === | ==== Step 2: Symbol table === | ||
semantic_tutorial.txt · Last modified: 2016/12/08 13:25 by deva
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