IL2C vs IL2CPP comparison

IL2C focuses on translating CIL to readable C99 for embedded portability with minimal footprint, while IL2CPP is Unity's AOT compiler to C++ for performance in game development. IL2C is open-source and experimental, whereas IL2CPP is proprietary and more mature for full .NET support.

How to run C# code on Arduino with IL2C

Use the IL2C.Runtime.Arduino package and integrate with Arduino IDE; compile C# to C, then include it in sketches. The samples include a calculator demo for ESP32-based M5Stack, as shown in the README photos.

What .NET features does IL2C not support

IL2C has limited support for advanced features like exception handling with complex unwind, some IL opcodes, and dynamic runtime services. Check the auto-generated 'Supported IL opcodes list' and 'Supported runtime system features' in the docs for specifics.

Is IL2C ready for commercial use

No, IL2C is marked as experimental in the README, so it's best for prototyping or educational purposes. For production, expect potential issues with compatibility, performance, and ongoing development changes.

How does IL2C handle garbage collection

IL2C implements a mark-and-sweep GC in the runtime, requiring manual heap management and execution frames, as illustrated in design photos. This adds overhead but allows control in resource-constrained environments.

Can IL2C work with Raspberry Pi

Yes, since IL2C requires only a C99 compiler and supports POSIX systems, it can run on Raspberry Pi with appropriate runtime dependencies like pthreads. Portability is a key feature, but test for specific library needs.

Open-Awesome

IL2C

Apache-2.0C#0.4.230

A translator that converts ECMA-335 CIL/MSIL bytecode into portable C99 source code for embedded systems and cross-platform use.

GitHub

449 stars39 forks0 contributors

What is IL2C?

IL2C is a translator that converts ECMA-335 Common Intermediate Language (CIL/MSIL) bytecode into standard C source code. It allows code written in .NET languages like C# to run on platforms lacking a .NET runtime, particularly embedded systems with limited resources. The tool focuses on generating human-readable C99-compliant output while maintaining interoperability with existing C libraries.

Target Audience

Developers working on embedded systems, IoT devices, or cross-platform projects who want to use C# or other .NET languages but need lightweight, portable C output. It also appeals to those interested in compiler design or .NET runtime internals.

Value Proposition

IL2C offers a unique blend of .NET language productivity with the portability and low footprint of C, enabling deployment on everything from Arduino to custom embedded hardware without a full .NET runtime. Its focus on readable generated code and minimal dependencies sets it apart from heavier alternatives.

Overview

IL2C - A translator for ECMA-335 CIL/MSIL to C language.

Use Cases

Best For

Running C# code on microcontrollers like Arduino or ESP32
Porting .NET applications to platforms without a .NET runtime
Embedded systems development with strict memory constraints
Cross-platform projects requiring C99 compatibility
Educational projects exploring CIL/MSIL translation
Integrating .NET logic with existing C libraries in resource-limited environments

Not Ideal For

Production systems requiring stable and fully-featured .NET runtime compatibility
Projects heavily dependent on advanced .NET features like async/await, LINQ, or dynamic reflection
Teams needing rapid development cycles without the complexity of a transpiler and manual C code management
Environments where a managed runtime with automatic garbage collection is preferred over low-level control

Pros & Cons

Pros

Readable C Output

Generates human-readable C99 code, as shown in the hello-world example, making performance analysis and debugging more transparent.

Minimal Memory Footprint

Targets kilobyte-scale memory usage for embedded systems without an OS, ideal for devices like Arduino and ESP32.

Broad Platform Portability

Requires only a C99 compiler and minimal runtime dependencies (heap, CAS instructions), supporting Win32, pthreads, and FreeRTOS.

Seamless C Interoperability

Supports .NET interop techniques like P/Invoke, enabling easy integration with existing C libraries without runtime overhead.

Cons

Experimental Status

The README explicitly states IL2C is 'experimental,' meaning it lacks production stability and may have unresolved bugs or breaking changes.

Incomplete .NET Support

Auto-generated lists for supported opcodes and runtime features indicate gaps, restricting use of some C# language constructs and standard libraries.

Complex Translation Overhead

Generated C code includes manual execution frames and garbage collection, adding setup complexity and potential performance trade-offs compared to native .NET.

Frequently Asked Questions

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