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Thread-Topic: [PATCH v4 2/2] LAM: Enable tagged pointer support for watchpoints. 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charset="us-ascii" MIME-Version: 1.0 X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: SN7PR11MB7638.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 2ada2eb3-8c85-4d8a-3c82-08dc9f2b45a0 X-MS-Exchange-CrossTenant-originalarrivaltime: 08 Jul 2024 08:52:17.9970 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: NQR2umc3DbAw90XjRDlbNZVmM1BBcoxVoHYqOTkROoBmA0wOcq4LAUFE5s5Fxb7L+QfRyUZ4js2XTCVcXEdCAA/ajbylba2zb+YDIxzhmH4= X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN7PR11MB7113 X-OriginatorOrg: intel.com Content-Transfer-Encoding: quoted-printable X-Spam-Status: No, score=-4.8 required=5.0 tests=BAYES_00, DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, SPF_HELO_NONE, SPF_NONE, TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: gdb-patches@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Gdb-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: gdb-patches-bounces~public-inbox=simark.ca@sourceware.org > > From: "Schimpe, Christina" > > CC: "gdb-patches@sourceware.org" , > > "Willgerodt, Felix" , "luis.machado@arm.co= m" > > > > Date: Fri, 5 Jul 2024 08:53:29 +0000 > > > > > > From: "Schimpe, Christina" > > > > CC: "gdb-patches@sourceware.org" , > > > > "Willgerodt, Felix" , > "luis.machado@arm.com" > > > > > > > > Date: Thu, 4 Jul 2024 13:15:20 +0000 > > > > > > > > So to answer your question properly: No, we don't explain the term " > > > tagged data pointers" anywhere. > > > > But we write for instance in the commit message "tagged pointers > > > > used for data accesses", which is understandable I think. > > > > > > Well, I'm sorry to say that it doesn't explain this enough for me. > > > I'm quite a heavy user of GDB, but I have no idea what is a tagged > > > pointer for data access. Do we have in the manual anything related > > > to such pointers, even if we use different words to talk about them? > > > If so, could you point me to those descriptions in the manual? > > > Maybe if I read what we say there, I could suggest wording for NEWS > > > that will be consistent with our terminology in the manual. > > > > > > Thanks. > > > > Hi Eli, > > > > Sorry for the confusion here. > > You are right, the term "tagged pointer" is not explained anywhere in t= he > manual. > > Also I couldn't find a section that describes them but uses a different > wording. > > > > I think the first time we use this term in GDB is with commit "Clear > > non-significant bits of address on memory access". > > The terms tagged address and tagged pointer are used. > > > > A very similar commit for setting a watchpoint on a tagged address but= for > AArch64 is: > > "Clear non-significant bits of address in watchpoint" > > > > For both commits I couldn't find any documentation/NEWS part. > > > > I will try to come up with a section on tagged addresses/pointers in the > manual. > = > Thank you. Hi Eli, = I discussed this internally and we still wonder whether we need to document= tagged pointers. I think I missed to mention one important detail, which is that t= agged pointers are no gdb concept but a generic concept: = https://en.wikipedia.org/wiki/Tagged_pointer. Do we need to document such generic concepts, too? Thanks, Christina Intel Deutschland GmbH Registered Address: Am Campeon 10, 85579 Neubiberg, Germany Tel: +49 89 99 8853-0, www.intel.de Managing Directors: Sean Fennelly, Jeffrey Schneiderman, Tiffany Doon Silva Chairperson of the Supervisory Board: Nicole Lau Registered Office: Munich Commercial Register: Amtsgericht Muenchen HRB 186928