MicroGC

small and unhandy (yet working) GC for tiny-go + wasm

Leaking + Stack GC for tiny go + wasm

It's like the leaking GC, but with the stack management elements inside:

package main
import (
	"github.com/metrico/micro-gc/stack"
)

func main() {

	for i := 0; i < 5; i++ {
		stack.PushStack() // push current heap pointer to the stack 
		arr := make([]byte, 100 * 1024 * 1024) //allocate as much as you want
		arr[0] = byte(i)
		stack.PopStack() // release all the memory allocated since the last PushStack
	}
}

Prerequisites

• tiny-go v0.30+

How to use

1. Import the library "github.com/metrico/micro-gc/stack" into the go code
2. Add stack.PushStack and stack.PopStack where you want
3. Build the wasm application with the -gc=custom flag

Known limitations

1. Be very careful with sync.Pool and all the global variables. PopStack may corrupt the data.
2. Be very careful with all the libraries using sync.Pool as well. Apparently, fmt.Println uses it.
3. Be careful working with goroutines.
4. Definitely not for multicore environments.

Examples

Feel free to get inspiration from the examples in the examples directory.

Build an example like this:

• tinygo build -gc=custom -target=wasm -o=test.wasm github.com/metrico/micro-gc/examples/array/

Then run it using nodeJS and wasm_exec file: node wasm_exec.js test.wasm