Commit 4350bdff authored by Kirill Smelkov's avatar Kirill Smelkov

go/zodb/internal/weak: Assert that the object was not moved in the finalizer

This is good to do since we are relying on non-moving property of
current GC. It never triggered but it removed one uncertainty while
debugging GC crash issue. Good to have it in place.
parent dbf5a97b
......@@ -31,9 +31,12 @@
package weak
import (
"fmt"
"runtime"
"sync"
"unsafe"
_ "go4.org/unsafe/assume-no-moving-gc"
)
......@@ -76,6 +79,12 @@ func NewRef[T any](obj *T) *Ref[T] {
var release func(*T)
release = func(obj *T) {
// assert that the object was not moved
iptr := (uintptr)(unsafe.Pointer(obj))
if w.iptr != iptr {
panic(fmt.Sprintf("weak: release: object moved: w.iptr=%x obj=%x", w.iptr, iptr))
}
// GC decided that the object is no longer reachable and
// scheduled us to run as finalizer. During the time till we
// actually run, Ref.Get might have been come to run and
......
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