Calling C/Asm from Espruino...

Is now a reality! (As of 1v60, or git commit a92ea2e529588c6f86cf268ff227438167052843)

addr = process.memory().stackEndAddress;

[0xb480,0xb083,0xaf00,0x6078,
 0x687b,0xf103,0x0302,0x4618,
 0xf107,0x070c,0x46bd,0xbc80,
 0x4770,0xbf00].forEach(function(v,a) { poke16(addr+a*2,v); });
a = E.nativeCall(addr+1, "long (long)");

The code above is just copy/pasted out of an object file generated by GCC. It takes a 64 bit int and adds 2 to it.

The function a that got created can be used just like any normal function:

>a(0) 
=2
>[1,2,3,4].map(a)
=[3,4,5,6]

So who wants to make a Thumb assembler written in JavaScript? :) Could be a fun project...

I actually got TCC (the Tiny C compiler) compiled into JavaScript with Emscriptem (so it could have run on the Web IDE), but unfortunately I can't get the code it produces to run on the Cortex M3.