perf annotate: Introduce annotated_source__alloc_histograms

So that we can call it independently, in contexts were we know we
already have notes->src allocated.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: https://lkml.kernel.org/n/tip-f5fn7tr1asey6g013wavpn4c@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index f6c9bb2..a6fa49b 100644 (file)
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -697,10 +697,9 @@ static void annotated_source__delete(struct annotated_source *src)
        free(src);
 }
 
-int symbol__alloc_hist(struct symbol *sym)
+static int annotated_source__alloc_histograms(struct annotated_source *src,
+                                             size_t size, int nr_hists)
 {
-       struct annotation *notes = symbol__annotation(sym);
-       size_t size = symbol__size(sym);
        size_t sizeof_sym_hist;
 
        /*
@@ -720,20 +719,29 @@ int symbol__alloc_hist(struct symbol *sym)
        sizeof_sym_hist = (sizeof(struct sym_hist) + size * sizeof(struct sym_hist_entry));
 
        /* Check for overflow in zalloc argument */
-       if (sizeof_sym_hist > SIZE_MAX / symbol_conf.nr_events)
+       if (sizeof_sym_hist > SIZE_MAX / nr_hists)
                return -1;
 
+       src->sizeof_sym_hist = sizeof_sym_hist;
+       src->nr_histograms   = nr_hists;
+       src->histograms      = calloc(nr_hists, sizeof_sym_hist) ;
+       return src->histograms ? 0 : -1;
+}
+
+int symbol__alloc_hist(struct symbol *sym)
+{
+       size_t size = symbol__size(sym);
+       struct annotation *notes = symbol__annotation(sym);
+
        notes->src = annotated_source__new();
        if (notes->src == NULL)
                return -1;
-       notes->src->histograms = calloc(symbol_conf.nr_events, sizeof_sym_hist);
-       if (notes->src->histograms == NULL) {
+
+       if (annotated_source__alloc_histograms(notes->src, size, symbol_conf.nr_events) < 0) {
                annotated_source__delete(notes->src);
                notes->src = NULL;
                return -1;
        }
-       notes->src->sizeof_sym_hist = sizeof_sym_hist;
-       notes->src->nr_histograms   = symbol_conf.nr_events;
        return 0;
 }