From: Jakub Jelinek <jakub@redhat.com>
Date: Sat, 11 Feb 2023 14:57:54 +0000 (+0100)
Subject: ipa-cp: Punt for too large offsets [PR108605]
X-Git-Tag: basepoints/gcc-14~1389
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=00a49047b504b27a8dd19d819c7bc48d54078767;p=thirdparty%2Fgcc.git

ipa-cp: Punt for too large offsets [PR108605]

Seems most of IPA uses unsigned type for byte offsets
ipa-param-manipulation.h:  unsigned unit_offset;
ipa-param-manipulation.h:  unsigned unit_offset;
ipa-param-manipulation.h:  void register_replacement (tree base, unsigned unit_offset, tree replacement);
ipa-param-manipulation.h:  tree lookup_replacement (tree base, unsigned unit_offset);
ipa-param-manipulation.h:                                                   unsigned unit_offset);
ipa-prop.h:  unsigned unit_offset;
ipa-prop.h:  tree get_value (int index, unsigned unit_offset, bool by_ref) const;
ipa-prop.h:  tree get_value (int index, unsigned unit_offset) const;
ipa-prop.h:  const ipa_argagg_value *get_elt (int index, unsigned unit_offset) const;
ipa-cp.cc:ipa_argagg_value_list::get_elt (int index, unsigned unit_offset) const
ipa-cp.cc:  unsigned prev_unit_offset = 0;
ipa-cp.cc:ipa_argagg_value_list::get_value (int index, unsigned unit_offset) const
ipa-cp.cc:ipa_argagg_value_list::get_value (int index, unsigned unit_offset,
ipa-cp.cc:      unsigned other_offset = other.m_elts[i].unit_offset;
ipa-cp.cc:  unsigned prev_unit_offset = 0;
ipa-cp.cc:  unsigned prev_unit_offset = 0;
ipa-cp.cc:      unsigned this_offset = elts[i].unit_offset;
ipa-cp.cc:  unsigned prev_unit_offset = 0;
ipa-cp.cc:        unsigned unit_offset = aglat->offset / BITS_PER_UNIT;
ipa-cp.cc:  unsigned prev_unit_offset = 0;
ipa-param-manipulation.cc:  unsigned unit_offset;
ipa-param-manipulation.cc:isra_get_ref_base_and_offset (tree expr, tree *base_p, unsigned *unit_offset_p)
ipa-param-manipulation.cc:                                                unsigned unit_offset,
ipa-param-manipulation.cc:                                                unsigned unit_offset)
ipa-param-manipulation.cc:ipa_param_body_adjustments::lookup_replacement (tree base, unsigned unit_offset)
ipa-param-manipulation.cc:  unsigned unit_offset;
ipa-prop.cc:      unsigned unit_offset = bit_offset / BITS_PER_UNIT;
ipa-sra.cc:  unsigned unit_offset;
ipa-sra.cc:  unsigned unit_offset;
ipa-sra.cc:                          unsigned unit_offset, unsigned unit_size)
ipa-sra.cc:      unsigned offset = argacc->unit_offset + delta_offset;
so before converting a HOST_WIDE_INT bit offset to unsigned byte offset
we need to punt for too large offsets.  Some places do that, e.g.
isra_get_ref_base_and_offset has
  if (offset < 0 || (offset / BITS_PER_UNIT) > UINT_MAX)
    return false;
but ipa_agg_value_from_jfunc doesn't.

The following patch fixes that.

2023-02-11  Jakub Jelinek  <jakub@redhat.com>

	PR ipa/108605
	* ipa-cp.cc (ipa_agg_value_from_jfunc): Return NULL_TREE also if
	item->offset bit position is too large to be representable as
	unsigned int byte position.

	* c-c++-common/pr108605.c: New test.
---

diff --git a/gcc/ipa-cp.cc b/gcc/ipa-cp.cc
index 826bbc6222b7..4b8dedc0c518 100644
--- a/gcc/ipa-cp.cc
+++ b/gcc/ipa-cp.cc
@@ -1982,7 +1982,9 @@ ipa_agg_value_from_jfunc (ipa_node_params *info, cgraph_node *node,
   tree value = NULL_TREE;
   int src_idx;
 
-  if (item->offset < 0 || item->jftype == IPA_JF_UNKNOWN)
+  if (item->offset < 0
+      || item->jftype == IPA_JF_UNKNOWN
+      || item->offset >= (HOST_WIDE_INT) UINT_MAX * BITS_PER_UNIT)
     return NULL_TREE;
 
   if (item->jftype == IPA_JF_CONST)
diff --git a/gcc/testsuite/c-c++-common/pr108605.c b/gcc/testsuite/c-c++-common/pr108605.c
new file mode 100644
index 000000000000..418b37d70192
--- /dev/null
+++ b/gcc/testsuite/c-c++-common/pr108605.c
@@ -0,0 +1,24 @@
+/* PR ipa/108605 */
+/* { dg-do compile { target { lp64 || llp64 } } } */
+/* { dg-options "-O2" } */
+
+struct S {
+  char a, b, c;
+  int d[__INT_MAX__], e;
+};
+
+void
+foo (struct S *s)
+{
+  if (s->b && s->c != 0)
+    __builtin_abort ();
+}
+
+void
+bar (void)
+{
+  struct S s[2];
+  s[0].a = 0;
+  s[0].e = 0;
+  foo (s);
+}