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Tue, 18 Nov 2025 09:12:03 -0800 (PST) X-Google-Smtp-Source: AGHT+IFictyd1nFR9I2aa96Vu71P40fr06553hmq8+lTR3r77xYQftC7gVgvG0DPbgAVe/Z9YJ6KaQ== X-Received: by 2002:a05:600c:1387:b0:45b:47e1:ef6d with SMTP id 5b1f17b1804b1-4778feb2507mr159264035e9.36.1763485922984; Tue, 18 Nov 2025 09:12:02 -0800 (PST) Received: from localhost ([31.111.84.207]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-42b53e84b12sm34839560f8f.15.2025.11.18.09.12.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 18 Nov 2025 09:12:02 -0800 (PST) From: Andrew Burgess To: Ezra.Sitorus@arm.com, gdb-patches@sourceware.org Cc: luis.machado.foss@gmail.com, pedro@palves.net, Ezra Sitorus Subject: Re: [RFC PATCH] gdb/py: Add pretty printer for __mfp8 for aarch64 In-Reply-To: <20251118141457.83739-1-Ezra.Sitorus@arm.com> References: <20251118141457.83739-1-Ezra.Sitorus@arm.com> Date: Tue, 18 Nov 2025 17:12:02 +0000 Message-ID: <87wm3ntgd9.fsf@redhat.com> MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: UAcvmoLmKzf92J2flurerScbEaQfcP8rEiGi7fmZN5A_1763485923 X-Mimecast-Originator: redhat.com Content-Type: text/plain 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 writes: > From: Ezra Sitorus > > __mfp8/mfloat8_t is encoded as unsigned int in DWARF so we are unable to > print out variables of this type properly. As a result, this patch adds > a python pretty printer to display these values. To use: Pretty printers are usually defined alongside the library that adds the types that need pretty printing. But (from a quick google search) it would seem that these types are ARM extensions to the C language, and so are present in most/all C compilers for ARM targets? Given that adding pretty printers to GDB is unusual, I think it is worth including a justification for why the pretty printers should be added here, and not with the compiler. > import gdb.printer > gdb.printer.register_aarch64_fp8_printer(gdb.current_objfile()) I think you ideally want these to be automatically registered, just how compiler pretty printers would be automatically loaded. You should investigate the 'new_objfile' event. But I'm not certain how you're going to decide if the pretty printer should be registered or not as you'll only want to register this for suitable AArch64 inferiors I guess. Maybe there's something that could be done via the program space? My concern is that if these printers don't auto-register then users aren't going to know this feature exists. Remember, we can always extend the Python API to add the features you need to make it possible to auto-register ... we just need to know what you need :) Thanks, Andrew