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runtime: test that write barriers are correctly marked unpreemptible

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Followon to CL 518055.

Change-Id: I05c4b429f49feb7012070e467fefbf3392260915
Reviewed-on: https://go-review.googlesource.com/c/go/+/518538
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Keith Randall <khr@google.com>
This commit is contained in:
Keith Randall 2023-08-10 15:07:43 -07:00 • committed by Keith Randall
parent 3378adc517
commit 1f4bb6112b
3 changed files with 146 additions and 0 deletions
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19
src/runtime/export_test.go
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@ -7,6 +7,7 @@
package runtime
import (
"internal/abi"
"internal/goarch"
"internal/goos"
"runtime/internal/atomic"
@ -1940,3 +1941,21 @@ func MyGenericFunc[T any]() {
testUintptr = 4
})
}
func UnsafePoint(pc uintptr) bool {
fi := findfunc(pc)
v := pcdatavalue(fi, abi.PCDATA_UnsafePoint, pc, nil)
switch v {
case abi.UnsafePointUnsafe:
return true
case abi.UnsafePointSafe:
return false
case abi.UnsafePointRestart1, abi.UnsafePointRestart2, abi.UnsafePointRestartAtEntry:
// These are all interruptible, they just encode a nonstandard
// way of recovering when interrupted.
return false
default:
var buf [20]byte
panic("invalid unsafe point code " + string(itoa(buf[:], uint64(v))))
}
}