[PATCH] dwarf2out: Fix ICE on large _BitInt in loc_list_from_tree_1 [PR113637]

[Jakub Jelinek]

Hi!

This spot uses SCALAR_INT_TYPE_MODE which obviously ICEs for large/huge
BITINT_TYPE types which have BLKmode.  But such large BITINT_TYPEs certainly
don't fit into DWARF2_ADDR_SIZE either, so we can just assume it would be
false if type has BLKmode.

Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?

2024-01-31  Jakub Jelinek  <ja...@redhat.com>

        PR debug/113637
        * dwarf2out.cc (loc_list_from_tree_1): Assume integral types
        with BLKmode are larger than DWARF2_ADDR_SIZE.

        * gcc.dg/bitint-80.c: New test.

--- gcc/dwarf2out.cc.jj 2024-01-24 13:11:21.132468150 +0100
+++ gcc/dwarf2out.cc    2024-01-30 17:23:41.249054946 +0100
@@ -19027,6 +19027,7 @@ loc_list_from_tree_1 (tree loc, int want
                && ! DECL_IGNORED_P (loc)
                && (INTEGRAL_TYPE_P (TREE_TYPE (loc))
                    || POINTER_TYPE_P (TREE_TYPE (loc)))
+               && TYPE_MODE (TREE_TYPE (loc)) != BLKmode
                && (GET_MODE_SIZE (SCALAR_INT_TYPE_MODE (TREE_TYPE (loc)))
                    <= DWARF2_ADDR_SIZE))
              {
--- gcc/testsuite/gcc.dg/bitint-80.c.jj 2024-01-30 17:30:02.843696120 +0100
+++ gcc/testsuite/gcc.dg/bitint-80.c    2024-01-30 17:32:33.301583203 +0100
@@ -0,0 +1,15 @@
+/* PR debug/113637 */
+/* { dg-do compile { target bitint } } */
+/* { dg-options "-g -std=c23" } */
+
+#if __BITINT_MAXWIDTH__ >= 639
+typedef _BitInt(639) B;
+#else
+typedef _BitInt(63) B;
+#endif
+
+void
+foo (B n)
+{
+  extern void bar (int [][n]);
+}

        Jakub