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scratch2c Wiki

scratch2c transpiles MIT Scratch 3 projects (.sb3 files) into compilable C code targeting userspace programs or Linux kernel modules.

Pages

• Getting Started — Install, run, compile your first project
• Architecture — How the pipeline works, stage by stage
• sb3 File Format — How Scratch encodes programs in project.json
• Intermediate Representation — The IR dataclasses that connect parsing to codegen
• Type System — How dynamic Scratch types become static C types
• Code Generation — How the IR becomes C, and how backends work
• Runtime Library — scratch_runtime.h function reference and design
• Adding Opcodes — How to support a new Scratch block
• Adding Backends — How to add a new compilation target
• Troubleshooting — Debugging the pipeline when output is wrong
• Known Limitations — What doesn't work and why