Deep cleanup: zero warnings, comprehensive tests, updated roadmap

[ryanbreen]

Summary

• Achieved ZERO compiler warnings through aggressive dead code removal
• Implemented comprehensive testing requirements
• Updated PROJECT_ROADMAP.md with current state
• Demonstrated 3 concurrent processes running successfully

Major Changes

1. Code Cleanup (70+ warnings removed)

• Removed 20+ unused functions: init_user_process, duplicate current_pid, test_userspace_syscalls, etc.
• Removed unused struct fields: threads, children, heap_size, next_process_base
• Removed unused enum variants: ProcessState::Blocked, ThreadState::Blocked
• Removed entire modules: syscall/dispatcher.rs, framebuffer Display struct
• Fixed all imports: Removed unused imports throughout codebase
• Result: cargo build --release completes with ZERO warnings

2. Testing Improvements

• Added POST test framework with 8 core system tests
• Created concurrent_process_tests.rs for validating multi-process execution
• Updated CLAUDE.md with strict quality requirements:
  • NO compiler warnings tolerance
  • ALL tests must pass
  • Clean builds required

3. Concurrent Process Success

Successfully demonstrated 3 concurrent processes:

Process 1: Hello from userspace\! Current time: 11 ticks
Process 2: Hello from userspace\! Current time: 13 ticks
Process 3: Hello from userspace\! Current time: 16 ticks

4. Key Fixes

• Re-enabled timer tick counting in interrupt handler
• Fixed page table isolation by skipping PML4 entry 0 copy
• Removed test functions that weren't part of test framework

5. Roadmap Update

• Consolidated multiple "Currently Working On" sections
• Updated with today's achievements
• Next focus: Implement thread spawning

Philosophy

Per our discussion, I was aggressive about removing dead code rather than just marking it. The only things kept were:

• Spawn-related functionality (planned for next implementation)
• Assembly entry points (syscall_entry, timer_interrupt_entry)
• Functions actively used by the system

This establishes a clean, warning-free codebase as the foundation for future development.

🤖 Generated with Claude Code