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Re: [PATCH 0/6] Unify the disassembler selection in gdb and objdump
- From: Pedro Alves <palves at redhat dot com>
- To: Yao Qi <qiyaoltc at gmail dot com>, binutils at sourceware dot org, gdb-patches at sourceware dot org
- Date: Tue, 23 May 2017 10:19:12 +0100
- Subject: Re: [PATCH 0/6] Unify the disassembler selection in gdb and objdump
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On 05/16/2017 11:48 AM, Yao Qi wrote:
> Nowadays, we have opcodes library which provides disassembler for each
> architecture (print_insn_XX functions), and gdb, objdump and sim use
> them. However, they (at least gdb and objdump) select disassembler
> in different places, so this causes some duplicated code and
> This patch series change gdb selecting disassembler through
> opcodes/disassemble.c:disassembler in default, but there are still
> some targets select their disassemblers in their own way (AFAICS,
> they can be changed to disassemble.c:disassembler too in the
> follow up patches).
> Patch #1 refactor the code. Patch #2 does the major change in this
> series, but only apply to the obvious places. Patch #3-4 do the
> similar changes too, but not as obvious as patch #2. Patch #5
> fixes the inconsistency of rs6000 disassembler selection. As a
> result of these changes, a lot of print_insn_XXX functions are no
> longer needed out side of opcodes library, so patch #6, as an RFC,
> moves these function declarations from include/dis-asm.h to an
> internal header in opcodes/.
> If this series is on the right track, I'll change the rest of gdb
> ports (like arm, mips, aarch64, etc) to default disassembler
I like this.
Eliminating objdump / gdb inconsistencies by design is great.
Passing arch/mach to opcodes:disassembler makes it possible to
have gdb tell opcodes to select the right disassembler based on
what arch the remote target description says the target has, even
without a bfd.
The GDB parts look good to me.
> The series is tested for gdb on x86_64-linux and ppc64-linux (gcc110).
Good testing. I was wondering whether the POWER/gdb change had any
visible effect on the testsuite.
[OTOH, if it didn't, then it sounds like we're missing some kind of
test that exercises default disassembler selection].
> It is also tested for binutils/ld/gas on x86_64-linux with all targets