4.2.1 PTHL Goals

Things to learn during this stage that you should remember:

• − Writing/debugging a scanner with Flex.
• − Using start conditions to handle non-regular issues within the scanner.
• − Using ‘yy::parser::make_SYMBOL’ to build whole symbols (containing a token type, a location, and possibly a semantic value) and pass them to the parser.
• − Writing/debugging a parser with Bison.
• − Resolving simple conflicts due to precedences and associativities thanks to directives (e.g., ‘%left’ etc.).
• − Resolving hard conflicts with loop unrolling. The case of lvalue vs. array instantiation is of first importance.