streamich / ass-js Goto Github PK

When the sub instruction is used, it is encoded as an adc (current npm version)

var assjs = require('ass-js');
var asm = assjs.X64();
asm._('sub', ['rax', 0x42]);
asm._('sub', ['rax', 0x4242]);
asm._('sub', ['rax', 'rbx']);
asm._('sub', ['rbx', 0x42]);
asm._('sub', ['rbx', 0x4242]);
asm._('sub', ['rbx', 'rbx']);
console.log(asm.toString());
console.log(asm.compile());

Code:

000 main:
001     subq    rax, 0x42                       ; 000000|000000 0x48, 0x83, 0xD0, 0x42 4 bytes
002     subq    rax, 0x00004242                 ; 000004|000004 0x48, 0x15, 0x42, 0x42, 0x00, 0x00 6 bytes
003     subq    rax, rbx                        ; 00000A|00000A 0x48, 0x11, 0xD8 3 bytes
004     subq    rbx, 0x42                       ; 00000D|00000D 0x48, 0x83, 0xD3, 0x42 4 bytes
005     subq    rbx, 0x00004242                 ; 000011|000011 0x48, 0x81, 0xD3, 0x42, 0x42, 0x00, 0x00 7 bytes
006     subq    rbx, rbx                        ; 000018|000018 0x48, 0x11, 0xDB 3 bytes

Encoding:
<Buffer 48 83 d0 42 48 15 42 42 00 00 48 11 d8 48 83 d3 42 48 81 d3 42 42 00 00 48 11 db>

Expected encoding:
<Buffer 48 83 e8 42 48 2d 42 42 00 00 48 29 d8 48 83 eb 42 48 81 eb 42 42 00 00 48 29 db>

• Improve docs
• Create API reference

Hey there,

I was looking at your project and I couldn't figure out a reason as to why I would (and what, rather) implement with this.

Would you have any example that would clarify why someone would use ass-js ? [this sounds terrible]

Thank you!

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@streamich
sorry: I see no email to address this rather than in issues:

How well (and with how much work) would this assembler be able to mock/run the Ethereum EVM? https://github.com/ethereumjs/ethereumjs-vm
the opcodes are in https://github.com/ethereumjs/ethereumjs-vm/blob/master/lib/opcodes.js

This is a wildly fascinating idea to me, but since there's no licensing noted anywhere I'm hesitant to do anything with it, since it's "in limbo", legally speaking.

Would you be willing to specify an open source license in the project?

I personally use the Very Open License in all my code (the Unlicense is very similar), but Choose A License will walk you through the more popular options.

I just came across it and only briefly skimmed the readme.
In the sample code, it declares asm, but the very next line says code.compile. I’m not sure if it means asm.compile or something else.
Anyway, I’m just genuinely curious. Thanks for the hard work!

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