thirdparty/libbacktrace: update from upstream

[apitrace] / thirdparty / libbacktrace / elf.c

diff --git a/thirdparty/libbacktrace/elf.c b/thirdparty/libbacktrace/elf.c
index ef9bcdfb495d935069ed5bd15ed221341f22c441..c1dbc5492e0ef261def2b99c7c177890c1172593 100644 (file)
--- a/thirdparty/libbacktrace/elf.c
+++ b/thirdparty/libbacktrace/elf.c
@@ -454,12 +454,46 @@ elf_syminfo (struct backtrace_state *state, uintptr_t pc,
             void *data)
 {
   struct elf_syminfo_data *edata;
-  struct elf_symbol *sym;
+  struct elf_symbol *sym = NULL;
+
+  if (!state->threaded)
+    {
+      for (edata = (struct elf_syminfo_data *) state->syminfo_data;
+          edata != NULL;
+          edata = edata->next)
+       {
+         sym = ((struct elf_symbol *)
+                bsearch (&pc, edata->symbols, edata->count,
+                         sizeof (struct elf_symbol), elf_symbol_search));
+         if (sym != NULL)
+           break;
+       }
+    }
+  else
+    {
+      struct elf_syminfo_data **pp;
+
+      pp = (struct elf_syminfo_data **) (void *) &state->syminfo_data;
+      while (1)
+       {
+         edata = *pp;
+         /* Atomic load.  */
+         while (!__sync_bool_compare_and_swap (pp, edata, edata))
+           edata = *pp;
+
+         if (edata == NULL)
+           break;
+
+         sym = ((struct elf_symbol *)
+                bsearch (&pc, edata->symbols, edata->count,
+                         sizeof (struct elf_symbol), elf_symbol_search));
+         if (sym != NULL)
+           break;
+
+         pp = &edata->next;
+       }
+    }
 
-  edata = (struct elf_syminfo_data *) state->syminfo_data;
-  sym = ((struct elf_symbol *)
-        bsearch (&pc, edata->symbols, edata->count,
-                 sizeof (struct elf_symbol), elf_symbol_search));
   if (sym == NULL)
     callback (data, pc, NULL, 0);
   else
@@ -862,7 +896,7 @@ backtrace_initialize (struct backtrace_state *state, int descriptor,
   pd.state = state;
   pd.error_callback = error_callback;
   pd.data = data;
-  pd.fileline_fn = fileline_fn;
+  pd.fileline_fn = &elf_fileline_fn;
   pd.found_sym = &found_sym;
   pd.found_dwarf = &found_dwarf;