* structure offset to structure name conversion.
@ 2011-10-27 19:29 James Courtier-Dutton
2011-10-27 20:30 ` Ian Lance Taylor
0 siblings, 1 reply; 3+ messages in thread
From: James Courtier-Dutton @ 2011-10-27 19:29 UTC (permalink / raw)
To: gcc
Hi,
If I have a structure e.g.
struct test_s {
int32_t var1;
int32_t var2;
uint64_t var3;
int var4;
} test;
If I have an offset value of 8, I wish to do a lookup and get to:
test.var3
Is there some part of gcc that I could use to parse .h files and
produce a table for me of offset against each variable in the
structure to permit this sort of lookup?
Kind Regards
James
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: structure offset to structure name conversion.
2011-10-27 19:29 structure offset to structure name conversion James Courtier-Dutton
@ 2011-10-27 20:30 ` Ian Lance Taylor
2011-10-27 21:32 ` Paul_Koning
0 siblings, 1 reply; 3+ messages in thread
From: Ian Lance Taylor @ 2011-10-27 20:30 UTC (permalink / raw)
To: James Courtier-Dutton; +Cc: gcc
James Courtier-Dutton <james.dutton@gmail.com> writes:
> If I have a structure e.g.
> struct test_s {
> int32_t var1;
> int32_t var2;
> uint64_t var3;
> int var4;
> } test;
>
> If I have an offset value of 8, I wish to do a lookup and get to:
> test.var3
>
> Is there some part of gcc that I could use to parse .h files and
> produce a table for me of offset against each variable in the
> structure to permit this sort of lookup?
This message would be more appropriate on the mailing list
gcc-help@gcc.gnu.org. Please take any followups to gcc-help. Thanks.
I'm not aware of anything quite like that, no. I think the closest you
could get easily would be to examine the debugging information. E.g.,
you could compile with -gstabs and run objdump -g. You would still have
to parse the objdump -g output, but at least the offset is there.
Ian
^ permalink raw reply [flat|nested] 3+ messages in thread* RE: structure offset to structure name conversion.
2011-10-27 20:30 ` Ian Lance Taylor
@ 2011-10-27 21:32 ` Paul_Koning
0 siblings, 0 replies; 3+ messages in thread
From: Paul_Koning @ 2011-10-27 21:32 UTC (permalink / raw)
To: james.dutton; +Cc: gcc
> If I have a structure e.g.
> struct test_s {
> int32_t var1;
> int32_t var2;
> uint64_t var3;
> int var4;
> } test;
>
> If I have an offset value of 8, I wish to do a lookup and get to:
> test.var3
>
> Is there some part of gcc that I could use to parse .h files and
> produce a table for me of offset against each variable in the
> structure to permit this sort of lookup?
GDB can do this, of course. There is also a utility "pahole" that reads debug data from an object file or executable file and produces that information. See your favorite search engine.
paul
^ permalink raw reply [flat|nested] 3+ messages in thread
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2011-10-27 19:29 structure offset to structure name conversion James Courtier-Dutton
2011-10-27 20:30 ` Ian Lance Taylor
2011-10-27 21:32 ` Paul_Koning
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