[PATCH RFA (print-tree)] c++: improve print_node of PTRMEM_CST

[Jason Merrill via Gcc-patches]

It's been inconvenient that pretty-printing of PTRMEM_CST didn't display
what member the constant refers to.

Adding that is complicated by the absence of a langhook for CONSTANT_CLASS_P
nodes; the simplest fix for that is to use the tcc_exceptional hook for
tcc_constant as well.

Tested x86_64-pc-linux-gnu.  OK for trunk, or should I add a new hook for
constants?

gcc/cp/ChangeLog:

        * ptree.c (cxx_print_xnode): Handle PTRMEM_CST.

gcc/ChangeLog:

        * print-tree.c (print_node): Also call print_xnode hook for
        tcc_constant class.
---
 gcc/cp/ptree.c   | 3 +++
 gcc/print-tree.c | 3 +--
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/gcc/cp/ptree.c b/gcc/cp/ptree.c
index 1dcd764af01..9e981d656e3 100644
--- a/gcc/cp/ptree.c
+++ b/gcc/cp/ptree.c
@@ -379,6 +379,9 @@ cxx_print_xnode (FILE *file, tree node, int indent)
       if (tree message = STATIC_ASSERT_MESSAGE (node))
        print_node (file, "message", message, indent+4);
       break;
+    case PTRMEM_CST:
+      print_node (file, "member", PTRMEM_CST_MEMBER (node), indent+4);
+      break;
     default:
       break;
     }
diff --git a/gcc/print-tree.c b/gcc/print-tree.c
index d1fbd044c27..b5dc523fcb1 100644
--- a/gcc/print-tree.c
+++ b/gcc/print-tree.c
@@ -1004,8 +1004,7 @@ print_node (FILE *file, const char *prefix, tree node, 
int indent,
          break;
 
        default:
-         if (EXCEPTIONAL_CLASS_P (node))
-           lang_hooks.print_xnode (file, node, indent);
+         lang_hooks.print_xnode (file, node, indent);
          break;
        }
 

base-commit: fae00a0ac0e5687343a60ae02bf60352002ab9aa
-- 
2.27.0