tree-optimization/105232 - handle overly large sizes in component_ref_size

The following properly checks tree_fits_poly_int64_p before converting
a size to a poly_int64.

2022-04-12  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/105232
	* tree.cc (component_ref_size): Bail out for too large
	or non-constant sizes.

diff --git a/gcc/tree.cc b/gcc/tree.cc
index 8f83ea1..609f0b4 100644 (file)
--- a/gcc/tree.cc
+++ b/gcc/tree.cc
@@ -12961,6 +12961,8 @@ component_ref_size (tree ref, special_array_member *sam /* = NULL */)
      to struct types with flexible array members.  */
   if (memsize)
     {
+      if (!tree_fits_poly_int64_p (memsize))
+       return NULL_TREE;
       poly_int64 memsz64 = memsize ? tree_to_poly_int64 (memsize) : 0;
       if (known_lt (baseoff, memsz64))
        {