perf probe: Show function entry line as probe-able

Function entry line should be shown as probe-able line,
because each function has declared line attribute.

LKML-Reference: <20100414224007.14630.96915.stgit@localhost6.localdomain6>
Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
index 03b469197a03e55a08f671ebb1a4b149eefa6a26..3e7977560be53f52b84bc590ba35e9275ee58b23 100644 (file)
--- a/tools/perf/util/probe-finder.c
+++ b/tools/perf/util/probe-finder.c
@@ -1127,6 +1127,45 @@ end:
        return ret;
 }
 
+/* Add a line and store the src path */
+static int line_range_add_line(const char *src, unsigned int lineno,
+                              struct line_range *lr)
+{
+       /* Copy real path */
+       if (!lr->path) {
+               lr->path = strdup(src);
+               if (lr->path == NULL)
+                       return -ENOMEM;
+       }
+       return line_list__add_line(&lr->line_list, lineno);
+}
+
+/* Search function declaration lines */
+static int line_range_funcdecl_cb(Dwarf_Die *sp_die, void *data)
+{
+       struct dwarf_callback_param *param = data;
+       struct line_finder *lf = param->data;
+       const char *src;
+       int lineno;
+
+       src = dwarf_decl_file(sp_die);
+       if (src && strtailcmp(src, lf->fname) != 0)
+               return DWARF_CB_OK;
+
+       if (dwarf_decl_line(sp_die, &lineno) != 0 ||
+           (lf->lno_s > lineno || lf->lno_e < lineno))
+               return DWARF_CB_OK;
+
+       param->retval = line_range_add_line(src, lineno, lf->lr);
+       return DWARF_CB_OK;
+}
+
+static int find_line_range_func_decl_lines(struct line_finder *lf)
+{
+       struct dwarf_callback_param param = {.data = (void *)lf, .retval = 0};
+       dwarf_getfuncs(&lf->cu_die, line_range_funcdecl_cb, &param, 0);
+       return param.retval;
+}
 
 /* Find line range from its line number */
 static int find_line_range_by_line(Dwarf_Die *sp_die, struct line_finder *lf)
@@ -1135,7 +1174,7 @@ static int find_line_range_by_line(Dwarf_Die *sp_die, struct line_finder *lf)
        Dwarf_Line *line;
        size_t nlines, i;
        Dwarf_Addr addr;
-       int lineno;
+       int lineno, ret = 0;
        const char *src;
        Dwarf_Die die_mem;
 
@@ -1145,6 +1184,7 @@ static int find_line_range_by_line(Dwarf_Die *sp_die, struct line_finder *lf)
                return -ENOENT;
        }
 
+       /* Search probable lines on lines list */
        for (i = 0; i < nlines; i++) {
                line = dwarf_onesrcline(lines, i);
                if (dwarf_lineno(line, &lineno) != 0 ||
@@ -1167,22 +1207,34 @@ static int find_line_range_by_line(Dwarf_Die *sp_die, struct line_finder *lf)
                if (strtailcmp(src, lf->fname) != 0)
                        continue;
 
-               /* Copy real path */
-               if (!lf->lr->path) {
-                       lf->lr->path = strdup(src);
-                       if (lf->lr->path == NULL)
-                               return -ENOMEM;
-               }
-               line_list__add_line(&lf->lr->line_list, lineno);
+               ret = line_range_add_line(src, lineno, lf->lr);
+               if (ret < 0)
+                       return ret;
        }
+
+       /*
+        * Dwarf lines doesn't include function declarations. We have to
+        * check functions list or given function.
+        */
+       if (sp_die) {
+               src = dwarf_decl_file(sp_die);
+               if (src && dwarf_decl_line(sp_die, &lineno) == 0 &&
+                   (lf->lno_s <= lineno && lf->lno_e >= lineno))
+                       ret = line_range_add_line(src, lineno, lf->lr);
+       } else
+               ret = find_line_range_func_decl_lines(lf);
+
        /* Update status */
-       if (!list_empty(&lf->lr->line_list))
-               lf->found = 1;
+       if (ret >= 0)
+               if (!list_empty(&lf->lr->line_list))
+                       ret = lf->found = 1;
+               else
+                       ret = 0;        /* Lines are not found */
        else {
                free(lf->lr->path);
                lf->lr->path = NULL;
        }
-       return lf->found;
+       return ret;
 }
 
 static int line_range_inline_cb(Dwarf_Die *in_die, void *data)