nodejs/V8是否将已编译的机器代码存储在磁盘上的任何位置? [英] Does nodejs/V8 store compiled machine code anywhere on disk?

问题描述

编辑:从Node 8.3开始，Node使用字节码，在此之前，源代码直接编译为机器代码.

Edit: Node uses bytecode since Node 8.3, before that, sources were compiled directly to machine code.

我做了很多Python编码，并且.pyc文件中总是存在字节码.

I do a lot of Python coding, and there's always bytecode lying around in .pyc files.

我想知道节点是否将其机器代码存储在相似的文件中，例如，将机器代码表示保留​​在磁盘上并在文件源未更改的情况下重新使用它是有意义的.

I was wondering if node stores its machine code in similar files, eg it would make sense to keep the machine code representation around on disk and re-use it if a file's source is unchanged.

如果是，那么node/v8将此机器代码存储在哪里?

If so, where does node/v8 store this machine code?

编辑2 :正如@dystroy在下面提到的，这是

Edit 2: As @dystroy mentions below this is a dupe of How can I see the machine code generated by v8?

推荐答案

V8在2016年推出了字节码解释器Ignition.您可以使用-print-bytecode (Node 8.3及更高版本)打印字节码.

V8 introduced a bytecode interpreter, Ignition, in 2016. You can print the bytecode with --print-bytecode (Node 8.3 and newer).

$ node --print-bytecode incrementX.js -e 'function incrementX(obj) {return 1 + obj.x;} incrementX({x: 42});`
...
[generating bytecode for function: incrementX]
Parameter count 2
Frame size 8
  12 E> 0x2ddf8802cf6e @    StackCheck
  19 S> 0x2ddf8802cf6f @    LdaSmi [1]
        0x2ddf8802cf71 @    Star r0
  34 E> 0x2ddf8802cf73 @    LdaNamedProperty a0, [0], [4]
  28 E> 0x2ddf8802cf77 @    Add r0, [6]
  36 S> 0x2ddf8802cf7a @    Return
Constant pool (size = 1)
0x2ddf8802cf21: [FixedArray] in OldSpace
 - map = 0x2ddfb2d02309 <Map(HOLEY_ELEMENTS)>
 - length: 1
           0: 0x2ddf8db91611 <String[1]: x>
Handler Table (size = 16)

请参见了解V8的字节码.

要查看机器代码，请使用-print-opt-code --code-comments .

To see the machine code, use --print-opt-code --code-comments.

这篇关于nodejs/V8是否将已编译的机器代码存储在磁盘上的任何位置?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！