python字节码语法 [英] python bytecode grammar

问题描述

在哪里可以找到python字节码的语法？ （如果在BCF更好

）。

where I can find the grammar of python bytecode ? ( better if is in BCF
).

推荐答案

M1st0写道：

我在哪里可以找到python字节码的语法？ （如果在BCF更好
）。

where I can find the grammar of python bytecode ? ( better if is in BCF
).

字节码没有语法 - 就像汇编指令一样。

And什么是BCF应该是什么意思 - BNF是语法的一种形式，BCF I

从未听说过。


除此之外：告诉我们你是什么'之后，我们可能会提供帮助并建议除了创建/操作字节码之外的其他方式，因为这被认为是一个不应该在

实现（如jython）并受到未经宣布的更改

之间的主要修订版本。


Diez

There is no grammar for bytecodes - the are like assembly instructions.
And what''s BCF supposed to mean - BNF is a form for grammars, BCF I
never heard of.

And besides that: tell us what you''re after, we might help and suggest
other ways than creating/manipulating bytecode, as this is considered a
implementation detail that is not supposed to work across
implementations (like jython) and is subject to unannounced changes
between major revisions of python.

Diez

Ops是BNF：P Bacus Normal Form如果我没错的话......


然而......


我尝试识别字节编码文件中的模式，以便优化...


但我想解析即重建它像一个

树..

，以便递归地应用树上的规则。


我有在Python中看到compile.c ...

Ops yes is BNF :P Bacus Normal Form if I am not wrong...

However......

I''am tryng to recognizing patterns in a bytecoded file in orderd to
optimize...

But I would like to "parse" i.e reconstruct it in something like a
tree..
in order to apply rules on a tree recursively.

I have seen compile.c in the Python dist...

M1st0写道：

Ops是BNF：P Bacus Normal Form如果我没有错......

然而......

我正在尝试识别字节编码文件中的模式，以便
优化...

但我想解析即重建它像一个树......
，以递归方式在树上应用规则。

Ops yes is BNF :P Bacus Normal Form if I am not wrong...

However......

I''am tryng to recognizing patterns in a bytecoded file in orderd to
optimize...

But I would like to "parse" i.e reconstruct it in something like a
tree..
in order to apply rules on a tree recursively.

但字节码就像汇编 - 没有树状结构。操作码是

后跟一些参数，oopcodes是一个序列。


然而字节码是以某种方式来自AST的_generated_。也许你可以在这上面工作。另外看看psyco，它已经做了优化

进行数值计算。


此外：我很怀疑你可以在

字节码级别本身，因为它非常高级。优化的努力

就像在psyco中没有改变字节码 - 它们取代它......


Diez

But bytecode is like assembly - there is no tree-structure. A opcode is
followed by a number of arguments, and oopcodes are in a seqence.

However the bytecode is _generated_ from the AST somehow. Maybe you can
work on that. Also take a look at psyco, it already does optimizations
for numeric calculations.

Besides: I serously doubt you can do much optimization on the
bytecodelevel itself, as it is very highlevel. The optimization efforts
like in psyco don''t alter bytecode - they replace it....

Diez

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