Algorithms manipulating context-free grammars often face issues with left recursion causing nontermination. Left recursion in a grammar leads to infinite recursion when generating or parsing a string. Fixing this involves rewriting the grammar to make it right recursive, avoiding left recursion. A real-life example of writing a C++ demangler involved tackling left recursion in the Itanium ABI grammar. Mutual left recursion occurs when two rules call each other. The solution involves converting left recursion to right recursion. Using macros for implementing grammar rules can simplify the process. By refining the grammar and removing recursion issues, stack overflow errors can be avoided in code implementation.
https://brightprogrammer.in/posts/fixing-recursions-in-grammar/