[PATCH] Fix PR 101515 (ICE in pp_cxx_unqualified_id, at cp/cxx-pretty-print.c:128)

[Qing Zhao <qing.zhao@oracle.com>]

Hi, 

This is the patch to fix PR101515 (ICE in pp_cxx_unqualified_id, at  cp/cxx-pretty-print.c:128)
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101515

It's possible that the TYPE_NAME of a record_type is NULL, therefore when
printing the TYPE_NAME, we should check and handle this special case.

Please see the comment of pr101515 for more details. 

The fix is very simple, just check and special handle cases when TYPE_NAME is NULL. 

Bootstrapped and regression tested on both x86 and aarch64, no issues.

Okay for commit?

Thanks.

Qing

=====================================

From f37ee8d21b80cb77d8108cb97a487c84c530545b Mon Sep 17 00:00:00 2001
From: Qing Zhao <qing.zhao@oracle.com>
Date: Tue, 8 Feb 2022 16:10:37 +0000
Subject: [PATCH] Fix PR 101515 ICE in pp_cxx_unqualified_id, at
 cp/cxx-pretty-print.c:128.

It's possible that the TYPE_NAME of a record_type is NULL, therefore when
printing the TYPE_NAME, we should check and handle this special case.

gcc/cp/ChangeLog:

	* cxx-pretty-print.cc (pp_cxx_unqualified_id): Check and handle
	the case when TYPE_NAME is NULL.

gcc/testsuite/ChangeLog:

	* g++.dg/pr101515.C: New test.
---
 gcc/cp/cxx-pretty-print.cc      |  5 ++++-
 gcc/testsuite/g++.dg/pr101515.C | 25 +++++++++++++++++++++++++
 2 files changed, 29 insertions(+), 1 deletion(-)
 create mode 100644 gcc/testsuite/g++.dg/pr101515.C

diff --git a/gcc/cp/cxx-pretty-print.cc b/gcc/cp/cxx-pretty-print.cc
index 4f9a090e520d..744ed0add5ba 100644
--- a/gcc/cp/cxx-pretty-print.cc
+++ b/gcc/cp/cxx-pretty-print.cc
@@ -171,7 +171,10 @@ pp_cxx_unqualified_id (cxx_pretty_printer *pp, tree t)
     case ENUMERAL_TYPE:
     case TYPENAME_TYPE:
     case UNBOUND_CLASS_TEMPLATE:
-      pp_cxx_unqualified_id (pp, TYPE_NAME (t));
+      if (TYPE_NAME (t))
+	pp_cxx_unqualified_id (pp, TYPE_NAME (t));
+      else
+	pp_string (pp, "<unnamed type>");
       if (tree ti = TYPE_TEMPLATE_INFO_MAYBE_ALIAS (t))
 	if (PRIMARY_TEMPLATE_P (TI_TEMPLATE (ti)))
 	  {
diff --git a/gcc/testsuite/g++.dg/pr101515.C b/gcc/testsuite/g++.dg/pr101515.C
new file mode 100644
index 000000000000..898c7e003c22
--- /dev/null
+++ b/gcc/testsuite/g++.dg/pr101515.C
@@ -0,0 +1,25 @@
+/* PR101515 -  ICE in pp_cxx_unqualified_id, at cp/cxx-pretty-print.c:128 
+   { dg-do compile }
+   { dg-options "-Wuninitialized -O1" } */
+
+struct S
+{
+  int j;
+};
+struct T : public S
+{
+  virtual void h () {}
+};
+struct ptrmemfunc
+{
+  void (*ptr) ();
+};
+typedef void (S::*sp)();
+int main ()
+{
+  T t;
+  sp x;
+  ptrmemfunc *xp = (ptrmemfunc *) &x;
+  if (xp->ptr != ((void (*)())(sizeof(void *))))  /* { dg-warning "is used uninitialized" } */
+    return 1;
+}
-- 
2.27.0