If you look at the output of your first command you see the result
`(**runtime.g)(<addr>)`, however you're trying to cast to
`(runtime.g*)(<addr>)`. The correct syntax you're looking for is
` *(*runtime.g)(<addr>)`. Hope that helps!
On Monday, November 11, 2019 at 11:29:42 PM UTC-8, Xiangdong JI wrote:
>
> Hi Derek,
>
> Say I have the pointer value of a specific G struct, how to convert it to
> 'struct g' (or any other form) in delve so that I can check
> the details of its fields?
>
> For example (simply utilized runtime.m0.curg to get a pointer value here)
>
> (dlv) p &runtime.m0.curg
> (**runtime.g)(0x56a140)
>
> Just tried a few commands to convert the value back to 'struct g' or a
> pointer to 'struct g'
>
> (dlv) p (runtime.g*)(0x56b140)
> Command failed: 1:12: expected operand, found ')'
> (dlv) p ('runtime.g'*)(0x56b140)
> Command failed: 1:2: illegal rune literal
> (dlv) p ("runtime.g"*)(0x56b140)
> Command failed: 1:14: expected operand, found ')'
> (dlv) p ("runtime".g*)(0x56b140)
> Command failed: 1:14: expected operand, found ')'
>
> Thanks.
>
> On Tuesday, November 12, 2019 at 2:28:12 AM UTC+8, Derek Parker wrote:
>>
>> Can you reply with a gist showing the exact Delve commands you are
>> attempting to use and what errors are being returned?
>>
>> There is some more information on the expression parser here
>> <https://github.com/go-delve/delve/blob/master/Documentation/cli/expr.md>.
>> You can also open an issue on the Delve Github repo and we can help you out
>> over there as well.
>>
>> On Sunday, November 10, 2019 at 11:58:24 PM UTC-8, Xiangdong JI wrote:
>>>
>>> Given a valid goroutine structure's pointer, say retrieving from the
>>> register 'g', how can I convert it to 'struct g' in delve or gdb?
>>>
>>> gdb usually reports "A syntax error in expression ...", and delve issues
>>> various "Command failed" message (failed to figure the proper way of
>>> converting a literal, I guess).
>>>
>>> Thanks.
>>>
>>
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