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Re: [PATCH v2 1/4] tools/tests/x86_emulator: avoid duplicate symbol error with clang
- To: Edwin Torok <edwin.torok@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 3 Mar 2026 16:36:51 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monne <roger.pau@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Tue, 03 Mar 2026 15:37:12 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 03.03.2026 16:09, Edwin Torok wrote:
>> On 3 Mar 2026, at 13:59, Jan Beulich <jbeulich@xxxxxxxx> wrote:
>> On 27.02.2026 11:58, Edwin Török wrote:
>>> --- a/tools/tests/x86_emulator/test_x86_emulator.c
>>> +++ b/tools/tests/x86_emulator/test_x86_emulator.c
>>> @@ -1882,8 +1882,13 @@ int main(int argc, char **argv)
>>> #define decl_insn(which) extern const unsigned char which[], \
>>> which##_end[] asm ( ".L" #which "_end" )
>>> #define put_insn(which, insn) ".pushsection .test\n" \
>>> - #which ": " insn "\n" \
>>> + ".ifndef "#which"\n" \
>>> + #which ": \n" \
>>> + ".endif\n" \
>>> + insn "\n" \
>>> + ".ifndef .L"#which"_end\n" \
>>> ".L" #which "_end:\n" \
>>> + ".endif\n" \
>>> ".popsection"
>>
>> Nice idea, but why multiple .ifndef, and why emitting the insn even if the
>> labels are already there (and hence won't be emitted a 2nd time)?
>
> I think we still need to execute the instructions, so they can be compared
> against the emulator.
Of course, but they cannot be executed without having a label. We use the
label to point the emulated IP there, and then we use the end label to
check that after emulation the emulated IP has advanced as expected.
Jan
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