From: Richard Sandiford <richard.sandiford@arm.com>
Date: Tue, 24 Oct 2023 10:30:52 +0000 (+0100)
Subject: rtl-ssa: Fix null deref in first_any_insn_use
X-Git-Tag: basepoints/gcc-15~5255
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=50313dcdf3324db6d6e522fcaa6ff94dd5de6d3f;p=thirdparty%2Fgcc.git

rtl-ssa: Fix null deref in first_any_insn_use

first_any_insn_use implicitly (but contrary to its documentation)
assumed that there was at least one use.

gcc/
	* rtl-ssa/member-fns.inl (first_any_insn_use): Handle null
	m_first_use.
---

diff --git a/gcc/rtl-ssa/member-fns.inl b/gcc/rtl-ssa/member-fns.inl
index c127fab8b981..3fdca14e0ef5 100644
--- a/gcc/rtl-ssa/member-fns.inl
+++ b/gcc/rtl-ssa/member-fns.inl
@@ -215,7 +215,7 @@ set_info::last_nondebug_insn_use () const
 inline use_info *
 set_info::first_any_insn_use () const
 {
-  if (m_first_use->is_in_any_insn ())
+  if (m_first_use && m_first_use->is_in_any_insn ())
     return m_first_use;
   return nullptr;
 }