public inbox for gcc-cvs@sourceware.org
help / color / mirror / Atom feed
* [gcc r13-5323] c++: Handle structured bindings like anon unions in initializers [PR108474]
@ 2023-01-24 10:32 Jakub Jelinek
0 siblings, 0 replies; only message in thread
From: Jakub Jelinek @ 2023-01-24 10:32 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:b84e21115700523b4d0ac44275443f7b9c670344
commit r13-5323-gb84e21115700523b4d0ac44275443f7b9c670344
Author: Jakub Jelinek <jakub@redhat.com>
Date: Tue Jan 24 11:28:00 2023 +0100
c++: Handle structured bindings like anon unions in initializers [PR108474]
As reported by Andrew Pinski, structured bindings (with the exception
of the ones using std::tuple_{size,element} and get which are really
standalone variables in addition to the binding one) also use
DECL_VALUE_EXPR and needs the same treatment in static initializers.
On Sun, Jan 22, 2023 at 07:19:07PM -0500, Jason Merrill wrote:
> Though, actually, why not instead fix expand_expr_real_1 (and staticp) to
> look through DECL_VALUE_EXPR?
Doing it when emitting the initializers seems to be too late to me,
we in various spots try to put parts of the static var DECL_INITIAL expressions
into the IL, or e.g. for varpool purposes remember which vars are referenced
there.
This patch moves it to record_reference, which is called from varpool_node::analyze
and so about the same time as gimplification of the bodies which also
replaces DECL_VALUE_EXPRs.
2023-01-24 Jakub Jelinek <jakub@redhat.com>
PR c++/108474
* cgraphbuild.cc: Include gimplify.h.
(record_reference): Replace VAR_DECLs with DECL_HAS_VALUE_EXPR_P with
their corresponding DECL_VALUE_EXPR expressions after unsharing.
* cp-gimplify.cc (cp_fold_r): Revert 2023-01-19 changes.
* g++.dg/cpp1z/decomp57.C: New test.
* g++.dg/cpp1z/decomp58.C: New test.
Diff:
---
gcc/cgraphbuild.cc | 12 +++++++++++
gcc/cp/cp-gimplify.cc | 10 ---------
gcc/testsuite/g++.dg/cpp1z/decomp57.C | 27 ++++++++++++++++++++++++
gcc/testsuite/g++.dg/cpp1z/decomp58.C | 39 +++++++++++++++++++++++++++++++++++
4 files changed, 78 insertions(+), 10 deletions(-)
diff --git a/gcc/cgraphbuild.cc b/gcc/cgraphbuild.cc
index f13abca1b93..597831e0a16 100644
--- a/gcc/cgraphbuild.cc
+++ b/gcc/cgraphbuild.cc
@@ -31,6 +31,7 @@ along with GCC; see the file COPYING3. If not see
#include "gimple-walk.h"
#include "ipa-utils.h"
#include "except.h"
+#include "gimplify.h"
/* Context of record_reference. */
struct record_reference_ctx
@@ -79,6 +80,17 @@ record_reference (tree *tp, int *walk_subtrees, void *data)
if (VAR_P (decl))
{
+ /* Replace vars with their DECL_VALUE_EXPR if any.
+ This is normally done during gimplification, but
+ static var initializers are never gimplified. */
+ if (DECL_HAS_VALUE_EXPR_P (decl))
+ {
+ tree *p;
+ for (p = tp; *p != decl; p = &TREE_OPERAND (*p, 0))
+ ;
+ *p = unshare_expr (DECL_VALUE_EXPR (decl));
+ return record_reference (tp, walk_subtrees, data);
+ }
varpool_node *vnode = varpool_node::get_create (decl);
ctx->varpool_node->create_reference (vnode, IPA_REF_ADDR);
}
diff --git a/gcc/cp/cp-gimplify.cc b/gcc/cp/cp-gimplify.cc
index 92cd309e670..a35cedd05cc 100644
--- a/gcc/cp/cp-gimplify.cc
+++ b/gcc/cp/cp-gimplify.cc
@@ -1035,16 +1035,6 @@ cp_fold_r (tree *stmt_p, int *walk_subtrees, void *data_)
}
break;
- case VAR_DECL:
- /* In initializers replace anon union artificial VAR_DECLs
- with their DECL_VALUE_EXPRs, as nothing will do it later. */
- if (DECL_ANON_UNION_VAR_P (stmt) && !data->genericize)
- {
- *stmt_p = stmt = unshare_expr (DECL_VALUE_EXPR (stmt));
- break;
- }
- break;
-
default:
break;
}
diff --git a/gcc/testsuite/g++.dg/cpp1z/decomp57.C b/gcc/testsuite/g++.dg/cpp1z/decomp57.C
new file mode 100644
index 00000000000..923862e78d1
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp1z/decomp57.C
@@ -0,0 +1,27 @@
+// PR c++/108474
+// { dg-do link { target c++17 } }
+
+struct T { int i, j; };
+T h;
+auto [i, j] = h;
+int &r = i;
+int s = i;
+int *t = &i;
+
+void
+foo (int **p, int *q)
+{
+ static int &u = i;
+ static int v = i;
+ static int *w = &i;
+ int &x = i;
+ int y = i;
+ int *z = &i;
+ *p = &i;
+ *q = i;
+}
+
+int
+main ()
+{
+}
diff --git a/gcc/testsuite/g++.dg/cpp1z/decomp58.C b/gcc/testsuite/g++.dg/cpp1z/decomp58.C
new file mode 100644
index 00000000000..b2604373bde
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp1z/decomp58.C
@@ -0,0 +1,39 @@
+// PR c++/108474
+// { dg-do link { target c++17 } }
+
+namespace std {
+ template <typename T> struct tuple_size;
+ template <int, typename> struct tuple_element;
+}
+
+struct A {
+ int i;
+ template <int I> int& get() { return i; }
+};
+
+template <> struct std::tuple_size <A> { static const int value = 2; };
+template <int I> struct std::tuple_element <I, A> { using type = int; };
+
+struct A a;
+auto [i, j] = a;
+int &r = i;
+int s = i;
+int *t = &i;
+
+void
+foo (int **p, int *q)
+{
+ static int &u = i;
+ static int v = i;
+ static int *w = &i;
+ int &x = i;
+ int y = i;
+ int *z = &i;
+ *p = &i;
+ *q = i;
+}
+
+int
+main ()
+{
+}
^ permalink raw reply [flat|nested] only message in thread
only message in thread, other threads:[~2023-01-24 10:32 UTC | newest]
Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2023-01-24 10:32 [gcc r13-5323] c++: Handle structured bindings like anon unions in initializers [PR108474] Jakub Jelinek
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).