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    SubjectRe: [PATCH v2] Re: perf annotate segfaults when source code has goto label that looks like hex number
    Em Mon, Aug 02, 2010 at 11:02:14AM +0200, Peter Zijlstra escreveu:
    > On Thu, 2010-07-22 at 16:11 -0300, Arnaldo Carvalho de Melo wrote:
    > > > > diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
    > > > > @@ -976,13 +976,15 @@ static int hist_entry__parse_objdump_line(struct hist_entry *self, FILE *file,
    > > > > if (line_ip != -1) {
    > > > > u64 start = map__rip_2objdump(self->ms.map, sym->start);
    > > > > offset = line_ip - start;
    > > > > + if (offset < 0 || (u64)line_ip > sym->end)
    > > > > + offset = -1;
    > >
    > > > This part is good idea anyway. Even if label will be interpreted as ip
    > > > perf at least will not crash. It may miss-report something if check will
    > > > accidentally succeed though.
    > >
    > > Yeah, we can possibly find a label which is a valid hex number and that
    > > falls inside the address range, but with what we have in objdump this
    > > seems to be the best we can have, I'll commit this.
    >
    > Wouldn't it be better to re-write perf-annotate to not have wild monkey
    > sex with objdump and instead 'borrow' some of the objdump code to
    > generate the output ourselves? That way we don't rely on the output
    > syntax at all..

    Right, the problem is that doing that seems like avoiding regular,
    mostly satisfying sex with a known partner to having a month long orgy
    blindfold. You can try, I'll pass for now.

    - Arnaldo


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