Merge branch 'perf/urgent' into perf/core

[pandora-kernel.git] / tools / perf / util / probe-finder.c

diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
index b7c85ce..a7c7145 100644 (file)
--- a/tools/perf/util/probe-finder.c
+++ b/tools/perf/util/probe-finder.c
@@ -1471,6 +1471,38 @@ static int find_probe_point_by_func(struct probe_finder *pf)
        return _param.retval;
 }
 
+struct pubname_callback_param {
+       char *function;
+       char *file;
+       Dwarf_Die *cu_die;
+       Dwarf_Die *sp_die;
+       int found;
+};
+
+static int pubname_search_cb(Dwarf *dbg, Dwarf_Global *gl, void *data)
+{
+       struct pubname_callback_param *param = data;
+
+       if (dwarf_offdie(dbg, gl->die_offset, param->sp_die)) {
+               if (dwarf_tag(param->sp_die) != DW_TAG_subprogram)
+                       return DWARF_CB_OK;
+
+               if (die_compare_name(param->sp_die, param->function)) {
+                       if (!dwarf_offdie(dbg, gl->cu_offset, param->cu_die))
+                               return DWARF_CB_OK;
+
+                       if (param->file &&
+                           strtailcmp(param->file, dwarf_decl_file(param->sp_die)))
+                               return DWARF_CB_OK;
+
+                       param->found = 1;
+                       return DWARF_CB_ABORT;
+               }
+       }
+
+       return DWARF_CB_OK;
+}
+
 /* Find probe points from debuginfo */
 static int find_probes(int fd, struct probe_finder *pf)
 {
@@ -1498,6 +1530,27 @@ static int find_probes(int fd, struct probe_finder *pf)
 
        off = 0;
        line_list__init(&pf->lcache);
+
+       /* Fastpath: lookup by function name from .debug_pubnames section */
+       if (pp->function) {
+               struct pubname_callback_param pubname_param = {
+                       .function = pp->function,
+                       .file     = pp->file,
+                       .cu_die   = &pf->cu_die,
+                       .sp_die   = &pf->sp_die,
+               };
+               struct dwarf_callback_param probe_param = {
+                       .data = pf,
+               };
+
+               dwarf_getpubnames(dbg, pubname_search_cb, &pubname_param, 0);
+               if (pubname_param.found) {
+                       ret = probe_point_search_cb(&pf->sp_die, &probe_param);
+                       if (ret)
+                               goto found;
+               }
+       }
+
        /* Loop on CUs (Compilation Unit) */
        while (!dwarf_nextcu(dbg, off, &noff, &cuhl, NULL, NULL, NULL)) {
                /* Get the DIE(Debugging Information Entry) of this CU */
@@ -1525,6 +1578,8 @@ static int find_probes(int fd, struct probe_finder *pf)
                }
                off = noff;
        }
+
+found:
        line_list__free(&pf->lcache);
        if (dwfl)
                dwfl_end(dwfl);
@@ -1946,6 +2001,22 @@ int find_line_range(int fd, struct line_range *lr)
                return -EBADF;
        }
 
+       /* Fastpath: lookup by function name from .debug_pubnames section */
+       if (lr->function) {
+               struct pubname_callback_param pubname_param = {
+                       .function = lr->function, .file = lr->file,
+                       .cu_die = &lf.cu_die, .sp_die = &lf.sp_die, .found = 0};
+               struct dwarf_callback_param line_range_param = {
+                       .data = (void *)&lf, .retval = 0};
+
+               dwarf_getpubnames(dbg, pubname_search_cb, &pubname_param, 0);
+               if (pubname_param.found) {
+                       line_range_search_cb(&lf.sp_die, &line_range_param);
+                       if (lf.found)
+                               goto found;
+               }
+       }
+
        /* Loop on CUs (Compilation Unit) */
        while (!lf.found && ret >= 0) {
                if (dwarf_nextcu(dbg, off, &noff, &cuhl, NULL, NULL, NULL) != 0)
@@ -1974,6 +2045,7 @@ int find_line_range(int fd, struct line_range *lr)
                off = noff;
        }
 
+found:
        /* Store comp_dir */
        if (lf.found) {
                comp_dir = cu_get_comp_dir(&lf.cu_die);