Meeting Summary: CS 631-02 Systems Foundations

• Date: Feb 19, 2026, 02:47 PM Pacific (US and Canada)
• Meeting ID: 882 2309 0019

Quick Recap

• Focus: Project One — expanding the NTLANG language to support scripts and expressions.
• Topics covered:
• Command-line argument processing and configuration handling
• Environment design for variables (in C and Rust)
• Parse tree structure and evaluation (post-order traversal)
• Expression and script modes; number bases and bitwise operations
• Use of AI tools for learning and development
• Message to students: Take on the challenge, practice hands-on learning, and maintain discipline.

Next Steps

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Detailed Summary

Project One: Script Expansion Overview

• Goal: Expand NTLANG to run scripts from files (beyond expression-only mode).
• Scope:
• Work with binary and hexadecimal data.
• More substantial effort than lab assignments.
• Due date: next Wednesday night (relative to meeting date).
• Language integration:
• Implementation in both C and Rust.
• Future focus: assembly language with Rust as the driver.
• Pipeline overview:
• Scan strings → create tokens → build Abstract Syntax Trees (ASTs).
• Evaluate ASTs; potential future compilation to RISC-V assembly.

Expression Parsing and Evaluation Strategies

• Representation: Expressions and scripts are parsed into tree structures.
• Evaluation:
• Use recursive, post-order traversal.
• Compute innermost operations first, then outward.
• Grammar choice:
• Operator precedence rules were not implemented.
• Instead, expression modes and command-line arguments were expanded.

NTLANG: Expression and Script Demonstration

• Capabilities:
• Supports multiple number bases: binary, decimal, hexadecimal.
• Performs bitwise operations.
• Handles two’s complement for negative numbers.
• Techniques:
• Conversion and evaluation across bases.
• Sign extension via bitwise operators.
• Flexible handling of bit widths and number representations.

NTLANG Capabilities and Features Tour

• Environment:
• Uses a dedicated data structure (environment) to map variable names to values.
• Language features:
• Variable assignment.
• Expression evaluation.
• Print functions that accept both variables and expressions.
• Demonstrations:
• Two’s complement conversion.
• Quadratic equation computation.
• Reusability:
• Printing and support functions are designed to be reusable.
• Outcome:
• Participants confirmed the specifications and capabilities were clear.

Script Expansion: Implementation Overview

• Modes:
• Expression mode and script mode.
• Required changes:
• Grammar updates.
• Scanner enhancements (new tokens).
• AST extensions (new node types).
• Environment design:
• Manage variable bindings (insert, update, lookup).
• Evaluation model:
• Statements and expressions represented as trees.
• Use post-order evaluation for statements and expressions.
• Implementation guidance:
• Details to be provided for both C and Rust.

AI and Work Efficiency Challenges

• Observations:
• AI enables complex tasks but can increase ambition and risk of burnout.
• Key skills:
• Executive function and organization are essential to leverage AI effectively.
• Tools discussed:
• ChatGPT, Perplexity, and others for programming, language development, and problem-solving.
• Practical advice:
• Implement command-line argument processing and configuration without external libraries (where feasible).

Rust Evaluation and Compiler Flags

• Evaluator behavior:
• Returns a 32-bit unsigned integer (uint32).
• Requires conversion utilities for various input formats.
• Environment structure:
• Defined in both C and Rust for variable bindings and lookups.
• Debugging support:
• New compiler flag: -D to print the scan table.
• Rust specifics:
• Emphasis on Rust’s expression-oriented syntax and implicit returns.
• Encouragement:
• Students are urged to embrace the implementation challenge—effort builds skill, akin to physical training.