Expose memory.grow, memory.size, memory.dataLength

[ballercat]

Goal

Unblock work for a full-blown allocator.

Overview

memory_grow are not available through walt, but can be implemented as members of the Memory and Table types.

Acceptance Criteria

This should work

const memory : Memory = { initial: 1 };

function test() {
  memory.size();
  memory.grow();
  memory.dataSize();
}

• Memory.grow()
• Memory.size() current size of memory
• Memory.dataSize length of the data section, always zero until data senction encoding is implemented.

[xtuc]

Just FYI WebAssembly/spec#649

[ballercat]

Thanks, hopefully, it only affects text encoding. Might need to adjust some docs etc.,

[poeticAndroid]

this would be nice :)

[ballercat]

Implemented by #148

[JobLeonard]

Not sure if this is the best place to ask, if I have a function that has to allocate a lot of memory for one operation (say I pass an unusually long array to it), but no more after that, will it keep using up all that memory?

[poeticAndroid]

yea, afaik you can't shrink memory.. if that's what you're asking..
The linear memory can only get bigger, not smaller..

[JobLeonard]

Thanks, good to know (that kind of sucks for the things that I was thinking of doing though, because it involves operations on arrays that can get quite big but only incidentally)

[poeticAndroid]

you can always reuse the memory for other stuff..