From: Andrew MacLeod <amacleod@redhat.com>
Date: Tue, 30 Nov 2021 00:53:50 +0000 (-0500)
Subject: Don't reuse reference after potential resize.
X-Git-Tag: basepoints/gcc-13~2726
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ab202b659dbdfd3a1f45ffe7a5052f35b5e8fa6d;p=thirdparty%2Fgcc.git

Don't reuse reference after potential resize.

When a new def chain is requested, any existing reference may no longer
be valid, so just use the object directly.

	PR tree-optimization/103467
	* gimple-range-gori.cc (range_def_chain::register_dependency): Don't
	use an object reference after a potential resize.
---

diff --git a/gcc/gimple-range-gori.cc b/gcc/gimple-range-gori.cc
index 911d7ac4ec8b..0dba34b58c5d 100644
--- a/gcc/gimple-range-gori.cc
+++ b/gcc/gimple-range-gori.cc
@@ -278,11 +278,12 @@ range_def_chain::register_dependency (tree name, tree dep, basic_block bb)
     {
       // Get the def chain for the operand.
       b = get_def_chain (dep);
-      // If there was one, copy it into result.
+      // If there was one, copy it into result.  Access def_chain directly
+      // as the get_def_chain request above could reallocate the vector.
       if (b)
-	bitmap_ior_into (src.bm, b);
+	bitmap_ior_into (m_def_chain[v].bm, b);
       // And copy the import list.
-      set_import (src, NULL_TREE, get_imports (dep));
+      set_import (m_def_chain[v], NULL_TREE, get_imports (dep));
     }
   else
     // Originated outside the block, so it is an import.