# cpp-orchestrator

**Repository Path**: suyuexinghen28/cpp-orchestrator

## Basic Information

- **Project Name**: cpp-orchestrator
- **Description**: A comprehensive, production-ready system for converting C# codebases to idiomatic, performant 
C++ code.

- **Primary Language**: Unknown
- **License**: Not specified
- **Default Branch**: main
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 0
- **Created**: 2025-10-19
- **Last Updated**: 2025-10-20

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

# C# to C++ Conversion System

A comprehensive, production-ready system for converting C# codebases to idiomatic, performant C++ code.

## Overview

This project provides an automated conversion pipeline that transforms C# source code into equivalent C++ code, complete with a runtime compatibility layer that mimics .NET Base Class Library (BCL) functionality.

### Key Features

- **Deep Semantic Analysis**: Roslyn-based C# analysis for accurate type and dependency resolution
- **Intelligent Transformation**: Rule-based conversion engine with customizable transformation patterns
- **Runtime Compatibility**: Comprehensive C++ shim library providing .NET-like APIs
- **Modern C++**: Generates idiomatic C++20 code with contemporary best practices
- **Cross-Platform**: Supports Windows, Linux, and macOS targets
- **Production Ready**: Comprehensive testing, benchmarking, and validation

## Architecture

The system consists of three primary components:

```
┌──────────────────────────────────────────────────────────────────┐
│                    C# to C++ Conversion System                   │
├──────────────────────────────────────────────────────────────────┤
│                                                                  │
│  ┌────────────────────┐       ┌─────────────────────┐          │
│  │  C# Analyzer       │       │  C++ Orchestrator   │          │
│  │  Service           │◄─────►│  (Pipeline Engine)  │          │
│  │  (.NET 8 + Roslyn) │ gRPC  │  (Python 3.11+)     │          │
│  └────────────────────┘       └─────────────────────┘          │
│                                         │                        │
│                                         │                        │
│                                         ▼                        │
│                              ┌─────────────────────┐            │
│                              │  C++ Runtime Shim   │            │
│                              │  (C++20 Library)    │            │
│                              └─────────────────────┘            │
│                                                                  │
└──────────────────────────────────────────────────────────────────┘
```

### Component Responsibilities

1. **[csharp-analyzer-service](./csharp-analyzer-service/README.md)**:
   - Roslyn-based semantic analysis
   - Type resolution and symbol extraction
   - Dependency graph construction
   - gRPC service interface

2. **[cpp-orchestrator](./cpp-orchestrator/README.md)**:
   - Conversion pipeline orchestration
   - Transformation rule engine
   - Template-based C++ code generation
   - Progress tracking and error handling

3. **[cpp-runtime-shim](./cpp-runtime-shim/README.md)**:
   - .NET-compatible type system
   - Collections (List, Dictionary, etc.)
   - String handling (UTF-16 compatible)
   - LINQ-like query operators
   - Async/await support (coroutines)

## Quick Start

### Prerequisites

- **.NET 8 SDK** (for C# Analyzer Service)
- **Python 3.11+** (for C++ Orchestrator)
- **CMake 3.20+** (for C++ Runtime Shim)
- **C++20-capable compiler**: GCC 11+, Clang 15+, or MSVC 2022+

### Installation

```bash
# Clone the repository
git clone https://github.com/your-org/csharp-to-cpp.git
cd csharp-to-cpp

# Build C# Analyzer Service
cd csharp-analyzer-service
dotnet build -c Release

# Install C++ Orchestrator
cd ../cpp-orchestrator
pip install -e ".[dev]"

# Build C++ Runtime Shim
cd ../cpp-runtime-shim
cmake -S . -B build -DCMAKE_BUILD_TYPE=Release
cmake --build build
```

### Basic Usage

```bash
# Convert a C# project to C++
cpp-orchestrator convert \
  --input /path/to/csharp/project \
  --output /path/to/cpp/output \
  --analyzer-service localhost:50051
```

See the [User Guide](./docs/user-guide.md) (to be created) for detailed usage instructions.

## Repository Structure

```
csharp-to-cpp/
├── csharp-analyzer-service/   # .NET 8 Roslyn analyzer gRPC service
├── cpp-orchestrator/          # Python orchestration engine
├── cpp-runtime-shim/          # C++ runtime compatibility layer
├── shared-config/             # Shared configuration and standards
├── docs/                      # Documentation and ADRs
│   └── adr/                   # Architecture Decision Records
├── samples/                   # Sample C# codebases for testing
├── benchmarks/                # Performance benchmarking suite
└── test_cases_repos/          # Test repositories (existing)
```

See [ADR-001: Repository Structure](./docs/adr/001-repository-structure.md) for the rationale behind this organization.

## Development

### Project Status

**Current Phase**: Phase 0 - Foundation (Directory Structure Setup)

**Roadmap**:
- **Phase 0**: ✅ Directory structure and foundational configuration
- **Phase 1**: Core implementation of analyzer, orchestrator, and runtime (In Progress)
- **Phase 2**: Basic conversion capabilities (planned)
- **Phase 3**: Advanced features (LINQ, async/await) (planned)
- **Phase 4**: Production hardening and optimization (planned)
- **Phase 5**: Framework support and ecosystem integration (planned)

See [Detailed Implementation Plan](./detailed_implementation_plan.md) for the complete roadmap.

### Building from Source

Each component can be built independently:

#### C# Analyzer Service

```bash
cd csharp-analyzer-service
dotnet restore
dotnet build -c Release
dotnet test
```

#### C++ Orchestrator

```bash
cd cpp-orchestrator
pip install -e ".[dev]"
pytest
black . && ruff check . && mypy src/
```

#### C++ Runtime Shim

```bash
cd cpp-runtime-shim
cmake -S . -B build -DBUILD_TESTING=ON
cmake --build build
ctest --test-dir build
```

### Running Tests

```bash
# Run all tests
./scripts/test-all.sh

# Run component-specific tests
./scripts/test-component.sh csharp-analyzer-service
./scripts/test-component.sh cpp-orchestrator
./scripts/test-component.sh cpp-runtime-shim
```

### Code Style

Each component follows language-specific style guidelines:

- **C#**: .editorconfig in `csharp-analyzer-service/`
- **Python**: Black formatter + Ruff linter (configured in `pyproject.toml`)
- **C++**: clang-format (configured in `.clang-format`)

See [Shared Configuration](./shared-config/README.md) for cross-cutting standards.

## Documentation

- **[Architecture Decision Records (ADRs)](./docs/adr/)**: Design decisions and rationale
- **[Component READMEs](./csharp-analyzer-service/README.md)**: Detailed component documentation
- **[Samples](./samples/README.md)**: Example conversions and test cases
- **[Benchmarks](./benchmarks/README.md)**: Performance testing and validation

Additional documentation (to be created in Phase 1):
- User Guide
- API Reference
- Conversion Guide
- Troubleshooting
- Contributing Guidelines

## Testing Strategy

### Test Levels

1. **Unit Tests**: Component-internal functionality
2. **Integration Tests**: Cross-component interaction
3. **End-to-End Tests**: Full conversion pipeline validation
4. **Regression Tests**: Prevent breaking changes to working conversions
5. **Performance Tests**: Benchmark runtime and conversion performance

### Test Infrastructure

- **C# Tests**: xUnit with FluentAssertions
- **Python Tests**: pytest with pytest-cov
- **C++ Tests**: Google Test or Catch2
- **Integration Tests**: Docker Compose orchestration

## Continuous Integration

GitHub Actions workflows for each component:

- **On PR**: Linting, unit tests, integration tests
- **On Push to main**: Full test suite + benchmarks
- **Nightly**: Extended tests, performance benchmarks, sample conversions
- **Weekly**: Large-scale integration tests

## Contributing

We welcome contributions! Please:

1. Read the [Contributing Guide](./CONTRIBUTING.md) (to be created)
2. Check existing issues or create a new one
3. Fork the repository and create a feature branch
4. Follow code style guidelines
5. Write tests for new functionality
6. Submit a pull request

### Development Workflow

1. **Choose a component**: Pick the component you want to work on
2. **Set up environment**: Follow component-specific setup instructions
3. **Make changes**: Implement your feature or fix
4. **Run tests**: Ensure all tests pass
5. **Submit PR**: Create a pull request with clear description

## Performance

Performance is a key goal of this project:

### Conversion Performance
- Small codebases (< 1K LOC): < 5 seconds
- Medium codebases (1-10K LOC): < 30 seconds
- Large codebases (> 10K LOC): < 5 minutes

### Runtime Performance
- Collections: Within 90-110% of C# performance
- Algorithms: 100-150% of C# (C++ should be faster)
- Memory: 50-80% of C# allocations (more deterministic)

See [Benchmarks](./benchmarks/README.md) for detailed performance data.

## License

[MIT License](./LICENSE) (or specify your license)

## Support and Contact

- **Issues**: [GitHub Issues](https://github.com/your-org/csharp-to-cpp/issues)
- **Discussions**: [GitHub Discussions](https://github.com/your-org/csharp-to-cpp/discussions)
- **Email**: support@your-org.com

## Acknowledgments

This project builds upon:
- Microsoft Roslyn compiler platform
- The C++ Standards Committee for modern C++ features
- Open-source C# and C++ communities

## Frequently Asked Questions

### Why convert C# to C++?

Common reasons include:
- Performance requirements (game engines, HPC, embedded systems)
- Platform constraints (no .NET runtime available)
- Integration with existing C++ codebases
- Reduced deployment size and dependencies
- Real-time or deterministic performance needs

### What C# features are supported?

See [Feature Support Matrix](./docs/feature-support.md) (to be created) for a complete list.

**Well Supported**:
- Classes, structs, enums
- Inheritance and interfaces
- Generics (via templates)
- Properties and indexers
- LINQ (via C++20 ranges)
- Async/await (via coroutines)

**Limited Support**:
- Reflection (compile-time only)
- Dynamic types (not supported)
- Framework-specific APIs (requires shimming)

### How accurate is the conversion?

The system aims for:
- **Semantic Equivalence**: Same behavior as original C#
- **Idiomatic C++**: Generated code follows C++ best practices
- **Performance**: Equal or better performance than C#

Validation through extensive testing ensures behavioral parity.

### Can I customize the conversion?

Yes! The transformation rules engine is fully customizable:
- Custom type mappings
- Pattern-specific transformations
- Template modifications
- Runtime shim extensions

See [Customization Guide](./docs/customization.md) (to be created).

## Project Status and Versioning

**Current Version**: 0.1.0-alpha (Phase 0 complete)

**Stability**: Early Development
- APIs subject to change
- Not yet recommended for production use
- Active development and iteration

**Release Schedule**:
- **v0.1.0**: Phase 0-1 complete (foundation + core)
- **v0.2.0**: Phase 2 complete (basic conversions)
- **v0.3.0**: Phase 3 complete (advanced features)
- **v1.0.0**: Production ready (Phase 4 complete)

---

**Built with modern tooling for reliable, performant C# to C++ conversion.**