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So Ruby on top of RPython on top of PyPy? Why not, but how does it compare to JRuby and Rubinius?

by steeve 14y ago

rayiner 14y ago
Not really. RPython is a statically-typed language which is used to implement PyPy's virtual machine framework. PyPy is itself a Python VM built on top of that framework, but the framework is designed to be reusable. So Topaz is a Ruby VM using that same virtual machine framework.
masklinn 14y ago
> So Ruby on top of RPython on top of PyPy? No. It's Ruby in RPython, where PyPy is Python in RPython. The pypy project is currently in the process of splitting "RPython" (the VM-development framework) from PyPy (the Python VM) to make that clearer. RPython is a general purpose, language-agnostic (ish?) core for implementing JIT-ed garbage-collected languages, it's kind-of similar to LLVM being a framework for implementing compilers. (now because rpython is a proper subset of python you can run your rpython VM on a python interpreter without translation, but that doesn't give you any specific python bridge, in the same way coding your VM in C doesn't give you a c FFI for free)
- fijal 14y ago
  RPython is generally language-agnostic, although dynamic langauges are much better suited for this sort of transformations. So it makes sense for any kind of dynamic language (like prolog even), but makes less sense for say Java or C.
- kzrdude 14y ago
  But RPython used to be the reduced version of the Python language. What name do you give to the jit-compiler generator?
  - masklinn 14y ago
    The same, as far as I've seen. RPython is both the VM-framework and the Python subset which exists within (and for) that framework (RPython is not considered and developed as a general purpose language, but as a language for building VMs within the RPython system/framework/toolset). The important distinction really is between RPython (a language and framework for building virtual machines) and PyPy (a virtual machine implemented in/on RPython)

So Ruby on top of RPython on top of PyPy? Why not, but how does it compare to JRuby and Rubinius?

by steeve 14y ago

So Ruby on top of RPython on top of PyPy? Why not, but how does it compare to JRuby and Rubinius?

Not really. RPython is a statically-typed language which is used to implement PyPy's virtual machine framework. PyPy is itself a Python VM built on top of that framework, but the framework is designed to be reusable. So Topaz is a Ruby VM using that same virtual machine framework.

masklinn 14y ago

> So Ruby on top of RPython on top of PyPy? No. It's Ruby in RPython, where PyPy is Python in RPython. The pypy project is currently in the process of splitting "RPython" (the VM-development framework) from PyPy (the Python VM) to make that clearer. RPython is a general purpose, language-agnostic (ish?) core for implementing JIT-ed garbage-collected languages, it's kind-of similar to LLVM being a framework for implementing compilers. (now because rpython is a proper subset of python you can run your rpython VM on a python interpreter without translation, but that doesn't give you any specific python bridge, in the same way coding your VM in C doesn't give you a c FFI for free)

fijal 14y ago
RPython is generally language-agnostic, although dynamic langauges are much better suited for this sort of transformations. So it makes sense for any kind of dynamic language (like prolog even), but makes less sense for say Java or C.
kzrdude 14y ago
But RPython used to be the reduced version of the Python language. What name do you give to the jit-compiler generator?
- masklinn 14y ago
  The same, as far as I've seen. RPython is both the VM-framework and the Python subset which exists within (and for) that framework (RPython is not considered and developed as a general purpose language, but as a language for building VMs within the RPython system/framework/toolset). The important distinction really is between RPython (a language and framework for building virtual machines) and PyPy (a virtual machine implemented in/on RPython)