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.