(Pretty) (naive) try to compile javascript to native code, with python.

python compiler.py script.js

Implementation

Values are represented as 32 bit integers, called BoxedInt (in v8 this is called smi): [ 31b data | 1b tag] tag: 1 = object, 0 = integer data: pointer/integer

Currently we lack any kind of memory allocator or garbage collector. If you always wanted to test some GC scheme, that's your chance, go ahead and implement it.

Only some basic operations are implemented, the most of them as so named stub calls (call to python function instead of machine code).

Variable Deceleration

 var x = 1, y; var z;

Identifier assignment (needs to be a declared variable)

 x = 'hello world';

if / conditional operator / for

 if (true) {
 }
 (x ? true : else);
 for (var i = 0; ; i++) { /* attention! never stops */
 }

(unary) plus / minus

 -1, +15, 1 + 1, x - 16.5;

increment / decrement void (used for logging)

 void 'foobar' /* would generator console output [heap object] @ 0xdeadbeef [string] "foobar" */

Array literals

 [1, 2, 3, 4];

Some other stuff that's merely an idea or doesn't work

 "".length, [].length

Credits

• SpiderMonkey
• v8 (clever stuff there!)
• pynarcissus (used for generating the ast)
• pyasm

License

pyasm

©️ 2008 by Florian Boesch pyalot@gmail.com. :license: GNU AGPL v3 or later, see LICENSE for more details.

pynarcissus

Version: MPL 1.1/GPL 2.0/LGPL 2.1 The Initial Developer of the Original Code is Brendan Eich brendan@mozilla.org. Portions created by the Initial Developer are Copyright (C) 2004 the Initial Developer. All Rights Reserved.