What is the maximum number of definitions allowed assigned to one inline C var

[espruino-discuss]

Posted at 2018-08-26 by Robin

Sun 2018.08.26

As it appears that basic math trig functions are not available using inline C either,

ref: 'Syntax for pow function using inline C'

http://forum.espruino.com/comments/14387611/

I am attempting to build SOH CAH TOA in static lookup tables. With the limitations on array handling

'Use Array/TypedArray.forEach to call your function'

http://www.espruino.com/InlineC

I wondering if hard coding each value using a smart name for lookup might be possible. Estimating around 320 unique definitions. Might this be possible without choking the inline C compiler?

Is there an online reference regarding compiler limitations?

[gfwilliams]

Posted at 2018-08-28 by @gfwilliams

I'm not quite sure what you intend? You want to just define an array? If so, you just define that array in your Inline C code:

var c = E.compiledC(`
// double lookup(int)

double lut[8] = {
 1,2,3,4,5,6,7,8
};
double lookup(unsigned int x)
{
  return lut[x&7]; 
}
`);

I don't believe there are limitations on the number of items you can have in Inline C, but each one uses a JsVar to store a reference to the function, so you'll quickly use up your device's memory.