On Wed, 6 Dec 2023 13:52:37 GMT, Per Minborg <pminb...@openjdk.org> wrote:
> This PR proposes to change the exception type for exceptions thrown for
> certain methods with a parameter of type `MemorySegment` when it is
> `MemorySegment::isReadOnly`. Previously an `UnsupportedOperationException`
> was specified but in some cases, in reality, an `IllegalArgumentException`
> was thrown.
>
> The principle used in this PR is that operations acting on an MS where the MS
> is `this` should throw an `UnsupportedOperationException` whereas in cases
> where the MS is a *parameter* an `IllegalArgumentException` should be thrown.
>
> It should be noted that this PR retains the previous behavior for MS
> VarHandle access (even though the MS is a parameter to the accessor methods,
> the first parameter can be said to represent `this`).
src/java.base/share/classes/java/lang/invoke/X-VarHandleSegmentView.java.template
line 153:
> 151: static void set(VarHandle ob, Object obb, long base, $type$ value) {
> 152: VarHandleSegmentViewBase handle = (VarHandleSegmentViewBase)ob;
> 153: AbstractMemorySegmentImpl bb = checkAddress(obb, base,
> handle.length, ON_WRITE_UOE);
I don't think this should throw UOE. It should throw IAE, because the bad
segment is passed to the var handle. I also realize that this exception is not
captured in the documentation of MemoryLayout::varHandle. So that should be
fixed as well.
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PR Review Comment: https://git.openjdk.org/jdk/pull/16993#discussion_r1417381854
