Parser-less build mode

[bnoordhuis]

Something touched upon recently by @chqrlie: make it possible to build qjs without the JS parser and bytecode generator.

Such builds can only execute bytecode read with JS_ReadObject() but you get a substantially smaller library in return. The parser makes up 15-25% of the library, depending on how you count.

Useful for embedded environments. Cuts down on attack surface.

A challenge is that JSON.parse() uses bits and pieces of the parser.

[TooTallNate]

Sounds interesting! I assume eval() and new Function() would also not be available in these builds? Would the JSON.parse() part also be a limitation of these builds or would solving that be a prereq for this feature?

[bnoordhuis]

No eval() and new Function() indeed. JSON.parse() should keep working though.

[bnoordhuis]

#1021 for people who want to test it.