targeting the PVM

[andy]

I wan't to write a small compiler for a small language with some experimental
features. I want the target to be portable. I'm evaluating both JVM and Python
Virtual Machine, both of which seem to be appropriate. I have found that the
format of the "JVM machine language" (i.e. class files) is well documented.
However I was not able to find some good documentation on "Python's machine
language".

Can someone provide with pointers?


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[Terry Reedy]

<an**@post.tau.ac.il> wrote in message
news:ma************************************@python .org...

I wan't to write a small compiler for a small language with some experimental features. I want the target to be portable. I'm evaluating both JVM and Python Virtual Machine, both of which seem to be appropriate.
Since it is a somewhat 'private' implementation device for CPython,
the developers retain the right to change the byte code or even
switch, for instance, to a register rather than stack machine.
However, the Python license will allow you to distribute any
particular interpreter (PVM) version for as long as you want.
However I was not able to find some good documentation on "Python's machine language".

Lib Reg 18.10 dis -- Disassembler for Python byte code
Lib Ref 18.10.1 Python Byte Code Instructions

To learn acual usage, experiment with dis.dis and defed functions or
compile()ed code objects. Example:

import dis
def bd(code): return dis.dis(compile(code,'<S>', 'eval')) .... bd('1+2')

0 SET_LINENO 0
3 LOAD_CONST 0 (1)
6 LOAD_CONST 1 (2)
9 BINARY_ADD
10 RETURN_VALUE