Ristretto JIT

Overview

Ristretto JIT provides a Just-In-Time compiler for the Ristretto VM. The JIT compiler generates native code from Ristretto VM bytecode, allowing for high-performance execution directly on the host machine.

Architecture

The JIT compiler follows a multi-stage compilation pipeline:

1. Bytecode Analysis - Analyzes Java bytecode for control flow patterns
2. Control Flow Graph Construction - Builds a block based control flow graph
3. SSA Transformation - Converts stack-based operations to Static Single Assignment form
4. Native Code Generation - Generates optimized machine code
5. Function Binding - Creates callable native functions

Features

• Fast execution through native code generation
• Automatic optimization of bytecode patterns
• Control flow graph analysis for complex branching logic
• Platform-specific compilation for x86-64, aarch64 (ARM64), s390x (IBM Z) and riscv64
• Comprehensive error handling with detailed error messages

Platform Support

The JIT compiler automatically adapts to the target platform:

• Native platforms:
  • x86-64 (Intel/AMD 64-bit)
  • aarch64 (ARM 64-bit)
  • s390x (IBM Z Architecture)
  • riscv64 (RISC-V 64-bit)

Limitations

Current limitations include:

• Only static methods and constructors (<init>) are supported
• Limited object-oriented features (no instance method compilation yet)
• No garbage collection integration
• Exception handling is not fully implemented

License

Licensed under either of

• Apache License, Version 2.0, (LICENSE-APACHE or https://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or https://opensource.org/licenses/MIT)

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.