About This Book

This programming guide explains how to use the cRexx Release 1 beta line toolchain in practice.

It focuses on the tools and workflows around Level B source:

• compiling .crexx with rxc or crexx
• learning practical Level B syntax, modules, classes, interfaces, and tested examples through the Level B tutorial
• using initial Level G tasks, structured scopes and concurrent HTTP with complete checked examples in Concurrent programming
• assembling .rxas with rxas
• running .rxbin with the crexx virtual machine executables rxvm and rxvme
• linking modules with rxlink
• packaging native executables with crexx -native and rxcpack
• exporting versioned typed operation contracts with crexx-contract
• using standard libraries, classes, interfaces, plugins, compiler exits, and integration APIs

Level B is the supported beta baseline. The concurrency chapter clearly marks its Level G syntax and libraries as initial and OPTIONS LEVELG-gated.

The language itself is defined in the cRexx Language Reference. The lower level bytecode, assembly, and runtime model are described in the cRexx VM Specification.

Audience

This guide is for developers who want to build and run cRexx programs, integrate cRexx into tools, or understand how the command-line pieces fit together. Plugin library and compiler-exit authors should read this guide together with the VM specification and the relevant public headers.