Fix stack overflow with autofdo (PR83355)

g++.dg/bprob* is failing currently with autofdo.

Running in gdb shows that there is a very deep recursion in get_index_by_decl until it
overflows the stack.

gcc/:
2017-12-11  Andi Kleen  <ak@linux.intel.com>

	PR gcov-profile/83355
	* auto-profile.c (string_table::get_index_by_decl): Don't
	recurse when abstract origin points to itself.

From-SVN: r255540

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index a00bff3..75a4dc4 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2017-12-11  Andi Kleen  <ak@linux.intel.com>
+
+       PR gcov-profile/83355
+       * auto-profile.c (string_table::get_index_by_decl): Don't
+       recurse when abstract origin points to itself.
+
 2017-12-11  Bin Cheng  <bin.cheng@arm.com>
 
        PR tree-optimization/83320

diff --git a/gcc/auto-profile.c b/gcc/auto-profile.c
index 5134a79..403709b 100644 (file)
--- a/gcc/auto-profile.c
+++ b/gcc/auto-profile.c
@@ -477,7 +477,7 @@ string_table::get_index_by_decl (tree decl) const
   ret = get_index (lang_hooks.dwarf_name (decl, 0));
   if (ret != -1)
     return ret;
-  if (DECL_ABSTRACT_ORIGIN (decl))
+  if (DECL_ABSTRACT_ORIGIN (decl) && DECL_ABSTRACT_ORIGIN (decl) != decl)
     return get_index_by_decl (DECL_ABSTRACT_ORIGIN (decl));
 
   return -1;

diff --git a/gcc/lto-streamer-in.c b/gcc/lto-streamer-in.c
index fd6bd06..3db1d38 100644 (file)
--- a/gcc/lto-streamer-in.c
+++ b/gcc/lto-streamer-in.c
@@ -360,6 +360,8 @@ lto_input_tree_ref (struct lto_input_block *ib, struct data_in *data_in,
     case LTO_label_decl_ref:
     case LTO_translation_unit_decl_ref:
     case LTO_namelist_decl_ref:
+      if (!data_in->file_data->current_decl_state)
+             printf("tag %d\n", tag);
       ix_u = streamer_read_uhwi (ib);
       result = lto_file_decl_data_get_var_decl (data_in->file_data, ix_u);
       break;