perf probe: Fix to show function entry line as probe-able

Fix die_walk_lines() to list the function entry line correctly.  Since
the dwarf_entrypc() does not return the entry pc if the DIE has only
range attribute, __die_walk_funclines() fails to list the declaration
line (entry line) in that case.

To solve this issue, this introduces die_entrypc() which correctly
returns the entry PC (the first address range) even if the DIE has only
range attribute. With this fix die_walk_lines() shows the function entry
line is able to probe correctly.

Fixes: 4cc9cec636e7 ("perf probe: Introduce lines walker interface")
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lore.kernel.org/lkml/157190837419.1859.4619125803596816752.stgit@devnote2
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/dwarf-aux.c b/tools/perf/util/dwarf-aux.c
index 929b7c0567f44dc23216d60e86c69ce398efd539..063f71da6b63ea0a230083df3621dda60cd4b7c7 100644 (file)
--- a/tools/perf/util/dwarf-aux.c
+++ b/tools/perf/util/dwarf-aux.c
@@ -307,6 +307,28 @@ bool die_is_func_def(Dwarf_Die *dw_die)
                dwarf_attr(dw_die, DW_AT_declaration, &attr) == NULL);
 }
 
+/**
+ * die_entrypc - Returns entry PC (the lowest address) of a DIE
+ * @dw_die: a DIE
+ * @addr: where to store entry PC
+ *
+ * Since dwarf_entrypc() does not return entry PC if the DIE has only address
+ * range, we have to use this to retrieve the lowest address from the address
+ * range attribute.
+ */
+int die_entrypc(Dwarf_Die *dw_die, Dwarf_Addr *addr)
+{
+       Dwarf_Addr base, end;
+
+       if (!addr)
+               return -EINVAL;
+
+       if (dwarf_entrypc(dw_die, addr) == 0)
+               return 0;
+
+       return dwarf_ranges(dw_die, 0, &base, addr, &end) < 0 ? -ENOENT : 0;
+}
+
 /**
  * die_is_func_instance - Ensure that this DIE is an instance of a subprogram
  * @dw_die: a DIE
@@ -713,7 +735,7 @@ static int __die_walk_funclines(Dwarf_Die *sp_die, bool recursive,
        /* Handle function declaration line */
        fname = dwarf_decl_file(sp_die);
        if (fname && dwarf_decl_line(sp_die, &lineno) == 0 &&
-           dwarf_entrypc(sp_die, &addr) == 0) {
+           die_entrypc(sp_die, &addr) == 0) {
                lw.retval = callback(fname, lineno, addr, data);
                if (lw.retval != 0)
                        goto done;

diff --git a/tools/perf/util/dwarf-aux.h b/tools/perf/util/dwarf-aux.h
index f204e58924034664da144ae5761c77d12d6c526c..506006e0cf6689b92af2c16fcdf4218e7be0fdfa 100644 (file)
--- a/tools/perf/util/dwarf-aux.h
+++ b/tools/perf/util/dwarf-aux.h
@@ -29,6 +29,9 @@ int cu_walk_functions_at(Dwarf_Die *cu_die, Dwarf_Addr addr,
 /* Get DW_AT_linkage_name (should be NULL for C binary) */
 const char *die_get_linkage_name(Dwarf_Die *dw_die);
 
+/* Get the lowest PC in DIE (including range list) */
+int die_entrypc(Dwarf_Die *dw_die, Dwarf_Addr *addr);
+
 /* Ensure that this DIE is a subprogram and definition (not declaration) */
 bool die_is_func_def(Dwarf_Die *dw_die);