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.c (component_ref_size): Bail out for too large
	or non-constant sizes.

(cherry picked from commit 1bd96873cf73c4f59de48e9bc0d17a498f1ede04)

diff --git a/gcc/tree.c b/gcc/tree.c
index 0f318430c77e33b31295f0cce5f5f9d6ae808a41..5f87455c68fd0467cc16efd9ba3e152aca205cd1 100644 (file)
--- a/gcc/tree.c
+++ b/gcc/tree.c
@@ -13951,6 +13951,8 @@ 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))
        {