tinygo/src/runtime/gc.go
Ayke van Laethem e171f32493
Implement minimal bump pointer allocator
Useful for MCUs, until a real garbage collector has been implemented.
2018-06-03 16:30:48 +02:00

31 строка
650 Б
Go

// +build !linux
package runtime
import (
"unsafe"
)
var (
_extern__heap_start unsafe.Pointer // defined by the linker
heapptr = uintptr(unsafe.Pointer(&_extern__heap_start))
)
func alloc(size uintptr) unsafe.Pointer {
// TODO: this can be optimized by not casting between pointers and ints so
// much. And by using platform-native data types (e.g. *uint8 for 8-bit
// systems).
size = align(size)
addr := heapptr
heapptr += size
for i := uintptr(0); i < uintptr(size); i += 4 {
ptr := (*uint32)(unsafe.Pointer(addr + i))
*ptr = 0
}
return unsafe.Pointer(addr)
}
func free(ptr unsafe.Pointer) {
// TODO: use a GC
}