On Mon, 9 Mar 2026 14:55:39 GMT, Paul Hübner <[email protected]> wrote:
> Hi all,
>
> This adds some more debug prints to various internals.
>
> When printing an `InstanceKlass`, the kind is now shown. For example:
>
> InstanceKlass (kind=1): java.lang.Integer {0x00001ff00022c318}
>
>
> The `InlineKlass::Members` are also printed. For example (note that to get
> individual array entries `WizardMode` must be enabled):
>
> - ---- inline type members:
> - extended signature registers: Array<T>(0x00000001330002f8)
> 0 : SigEntry: type=18 offset=0 null_marker=0 Symbol: 'java/lang/Integer'
> count 65535
> 1 : SigEntry: type=10 offset=16 null_marker=0 Symbol: 'value' count 65535
> 2 : SigEntry: type=14 offset=24 null_marker=0 Symbol: 'java/lang/Integer'
> count 65535
> - return registers: Array<T>(0x0000000133000348)
> 0 : (c_rarg0,c_rarg0)
> 1 : (c_rarg7,BAD!)
> - pack handler: 0x0000000119b21238
> - pack handler (jobject): 0x0000000119b21140
> - unpack handler: 0x0000000119b21244
> - null reset offset: 128
> - payload offset: 16
> - payload size (bytes): 8
> - payload alignment: 8
> - null-free non-atomic size (bytes): 4
> - null-free non-atomic alignment: 4
> - null-free atomic size (bytes): 4
> - nullable atomic size (bytes): 8
> - nullable non-atomic size (bytes): 5
> - null marker offset: 20
>
>
> Fields now indicate their field flags. Non-static fields indicate (a) when
> they are flat and (b) their layout when flat. For example:
>
> - ---- non-static fields (1 words):
> - private final value flat 'inner' (fields 0x00000006) 'LAValue;' @12
> LayoutKind: NULLABLE_NON_ATOMIC_FLAT
>
>
> Arrays already have plenty of flattening information that can be printed.
>
> Testing: tiers 1-3.
This pull request has now been integrated.
Changeset: 2e98a4d5
Author: Paul Hübner <[email protected]>
URL:
https://git.openjdk.org/valhalla/commit/2e98a4d523e97713fa4a0e55ec08c89e47fde0f8
Stats: 148 lines in 12 files changed: 96 ins; 26 del; 26 mod
8375051: [lworld] debugging methods should provide more Valhalla related
information
Reviewed-by: aboldtch, fparain
-------------
PR: https://git.openjdk.org/valhalla/pull/2208
