[gcc r13-3143] compiler: better arg type checking for selected builtins

[gcc r13-3143] compiler: better arg type checking for selected builtins

[Ian Lance Taylor]

https://gcc.gnu.org/g:8a9e92b249c9c5a5371588b1e939a90a677b4fd3

commit r13-3143-g8a9e92b249c9c5a5371588b1e939a90a677b4fd3
Author: Than McIntosh <thanm@google.com>
Date:   Thu Oct 6 15:58:59 2022 -0400

    compiler: better arg type checking for selected builtins
    
    Tighten up the argument type checking for Builtin_call_expression to
    catch erroneous cases such as
    
       panic(panic("bad")))
    
    where an argument void type is being passed to panic/alignof/sizeof.
    
    Fixes golang/go#56071.
    
    Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/439815

Diff:
---
 gcc/go/gofrontend/MERGE          | 2 +-
 gcc/go/gofrontend/expressions.cc | 7 ++++++-
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/gcc/go/gofrontend/MERGE b/gcc/go/gofrontend/MERGE
index 4793c821eba..10ed3fee67c 100644
--- a/gcc/go/gofrontend/MERGE
+++ b/gcc/go/gofrontend/MERGE
@@ -1,4 +1,4 @@
-8f1a91aeff400d572857895b7f5e863ec5a4d93e
+50707b4b51266166ce9bcf9de187e35760ec50f9
 
 The first line of this file holds the git revision number of the last
 merge done from the gofrontend repository.
diff --git a/gcc/go/gofrontend/expressions.cc b/gcc/go/gofrontend/expressions.cc
index 2492d9fe735..247ae1bba34 100644
--- a/gcc/go/gofrontend/expressions.cc
+++ b/gcc/go/gofrontend/expressions.cc
@@ -10316,7 +10316,12 @@ Builtin_call_expression::do_check_types(Gogo*)
     case BUILTIN_PANIC:
     case BUILTIN_SIZEOF:
     case BUILTIN_ALIGNOF:
-      this->check_one_arg();
+      if (this->check_one_arg())
+        {
+	  Expression* arg = this->one_arg();
+	  if (arg->type()->is_void_type())
+	    this->report_error(_("argument to builtin has void type"));
+        }
       break;
 
     case BUILTIN_RECOVER: