linux-kernel - Re: [PATCH 13/48] perf annotate: Add annotate_get_insn

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Date:   Tue, 24 Oct 2023 12:10:01 -0700
From:   Namhyung Kim <namhyung@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Jiri Olsa <jolsa@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Ingo Molnar <mingo@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-perf-users@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Stephane Eranian <eranian@...gle.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        linux-toolchains@...r.kernel.org, linux-trace-devel@...r.kernel.org
Subject: Re: [PATCH 13/48] perf annotate: Add annotate_get_insn_location()

Hi Arnaldo,

On Mon, Oct 23, 2023 at 9:38 AM Arnaldo Carvalho de Melo
<acme@...nel.org> wrote:
>
> Em Wed, Oct 11, 2023 at 08:50:36PM -0700, Namhyung Kim escreveu:
> > The annotate_get_insn_location() is to get the detailed information of
> > instruction locations like registers and offset.  It has source and
> > target operands locations in an array.  Each operand can have a
> > register and an offset.  The offset is meaningful when mem_ref flag is
> > set.
>
> This needs to be enclosed in HAVE_DWARF_SUPPORT, as the build is failing
> in systems where this isn't available, see patch below.

Thanks for the test and the patch, will add it to v2.

Namhyung

>
>   CC      /tmp/build/perf/arch/x86/util/pmu.o
> util/annotate.c: In function 'extract_reg_offset':
> util/annotate.c:3537:24: error: implicit declaration of function 'get_dwarf_regnum' [-Werror=implicit-function-declaration]
>  3537 |         op_loc->reg1 = get_dwarf_regnum(regname, 0);
>       |                        ^~~~~~~~~~~~~~~~
>   CC      /tmp/build/perf/tests/vmlinux-kallsyms.o
>
> I tested it with 'make NO_DWARF=1'
>
> - Arnaldo
>
> diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
> index 9d653a1e84ce4889..b998c81c89be04fc 100644
> --- a/tools/perf/util/annotate.c
> +++ b/tools/perf/util/annotate.c
> @@ -3486,6 +3486,7 @@ int annotate_check_args(struct annotation_options *args)
>         return 0;
>  }
>
> +#ifdef HAVE_DWARF_SUPPORT
>  /*
>   * Get register number and access offset from the given instruction.
>   * It assumes AT&T x86 asm format like OFFSET(REG).  Maybe it needs
> @@ -3591,3 +3592,4 @@ int annotate_get_insn_location(struct arch *arch, struct disasm_line *dl,
>
>         return 0;
>  }
> +#endif // HAVE_DWARF_SUPPORT
> diff --git a/tools/perf/util/annotate.h b/tools/perf/util/annotate.h
> index 4adda492233d2742..484be346a279c481 100644
> --- a/tools/perf/util/annotate.h
> +++ b/tools/perf/util/annotate.h
> @@ -437,6 +437,7 @@ int annotate_parse_percent_type(const struct option *opt, const char *_str,
>
>  int annotate_check_args(struct annotation_options *args);
>
> +#ifdef HAVE_DWARF_SUPPORT
>  /**
>   * struct annotated_op_loc - Location info of instruction operand
>   * @reg: Register in the operand
> @@ -473,4 +474,5 @@ struct annotated_insn_loc {
>  int annotate_get_insn_location(struct arch *arch, struct disasm_line *dl,
>                                struct annotated_insn_loc *loc);
>
> +#endif /* HAVE_DWARF_SUPPORT */
>  #endif /* __PERF_ANNOTATE_H */