Compiler Phases and Intermediate Representation

The Plato compiler has multiple passes and intermediate representations.

1. ParserInput - wraps the source code strings with a line/column lookup table.
2. ParserNode - A linked list of structures with labels and indexes into source created by specific rules in grammar.
3. ParserTreeNode - A tree of parser nodes generated from the list of ParserNode structures.
4. CstNode - A set of strongly typed structures representing the Concrete Syntax Tree auto-generated from the grammar .
5. AstNode - An Abstract Syntax Tree which represent the syntax in generic and simplified format.
6. Symbol - First level representation of semantics, created during name resolution. Does not resolve overloaded functions.