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* [gcc(refs/vendors/redhat/heads/gcc-8-branch)] c++: Fix ICE with using and virtual function. [PR95719]
@ 2021-05-14 14:55 Jakub Jelinek
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From: Jakub Jelinek @ 2021-05-14 14:55 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:1147c3ab5f1e91949f224962f75b675a14f4e989
commit 1147c3ab5f1e91949f224962f75b675a14f4e989
Author: Jason Merrill <jason@redhat.com>
Date: Tue Jun 23 21:25:21 2020 -0400
c++: Fix ICE with using and virtual function. [PR95719]
conversion_path points to the base where we found the using-declaration, not
where the function is actually a member; look up the actual base. And then
maybe look back to the derived class if the base is primary.
gcc/cp/ChangeLog:
PR c++/95719
* call.c (build_over_call): Look up the overrider in base_binfo.
* class.c (lookup_vfn_in_binfo): Look through BINFO_PRIMARY_P.
gcc/testsuite/ChangeLog:
PR c++/95719
* g++.dg/tree-ssa/final4.C: New test.
(cherry picked from commit 710df943389a854ef00c15ed0ad219b41db236aa)
Diff:
---
gcc/cp/call.c | 6 +++++-
gcc/cp/class.c | 4 ++++
gcc/testsuite/g++.dg/tree-ssa/final4.C | 10 ++++++++++
3 files changed, 19 insertions(+), 1 deletion(-)
diff --git a/gcc/cp/call.c b/gcc/cp/call.c
index 89a3053081d..836ece3f56d 100644
--- a/gcc/cp/call.c
+++ b/gcc/cp/call.c
@@ -7919,7 +7919,11 @@ build_over_call (struct z_candidate *cand, int flags, tsubst_flags_t complain)
if (DECL_VINDEX (fn) && (flags & LOOKUP_NONVIRTUAL) == 0
&& resolves_to_fixed_type_p (arg))
{
- fn = lookup_vfn_in_binfo (DECL_VINDEX (fn), cand->conversion_path);
+ tree binfo = cand->conversion_path;
+ if (BINFO_TYPE (binfo) != DECL_CONTEXT (fn))
+ binfo = lookup_base (binfo, DECL_CONTEXT (fn), ba_unique,
+ NULL, complain);
+ fn = lookup_vfn_in_binfo (DECL_VINDEX (fn), binfo);
flags |= LOOKUP_NONVIRTUAL;
}
diff --git a/gcc/cp/class.c b/gcc/cp/class.c
index b06aa6faedf..baf3bbed2c1 100644
--- a/gcc/cp/class.c
+++ b/gcc/cp/class.c
@@ -2405,6 +2405,10 @@ lookup_vfn_in_binfo (tree idx, tree binfo)
int ix = tree_to_shwi (idx);
if (TARGET_VTABLE_USES_DESCRIPTORS)
ix /= MAX (TARGET_VTABLE_USES_DESCRIPTORS, 1);
+ while (BINFO_PRIMARY_P (binfo))
+ /* BINFO_VIRTUALS in a primary base isn't accurate, find the derived
+ class that actually owns the vtable. */
+ binfo = BINFO_INHERITANCE_CHAIN (binfo);
tree virtuals = BINFO_VIRTUALS (binfo);
return TREE_VALUE (chain_index (ix, virtuals));
}
diff --git a/gcc/testsuite/g++.dg/tree-ssa/final4.C b/gcc/testsuite/g++.dg/tree-ssa/final4.C
new file mode 100644
index 00000000000..cce6e9afadb
--- /dev/null
+++ b/gcc/testsuite/g++.dg/tree-ssa/final4.C
@@ -0,0 +1,10 @@
+// PR c++/95719
+// { dg-do compile { target c++11 } }
+
+struct S1 { virtual ~S1(); };
+struct S2 {
+ virtual ~S2();
+ virtual void f();
+};
+struct S3 final: S1, S2 { using S2::f; };
+void g(S3 & s) { s.f(); }
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