Go patch committed: Don't crash if writing type functions too late

[Ian Lance Taylor]

This patch to the Go frontend avoids a crash if an error causes us to
write out type functions too late.  Bootstrapped and ran Go testsuite on
x86_64-unknown-linux-gnu.  Committed to mainline.

Ian


diff -r 90c26bab1684 go/gogo.h
--- a/go/gogo.h	Wed Mar 07 08:04:32 2012 -0800
+++ b/go/gogo.h	Wed Mar 07 13:50:47 2012 -0800
@@ -398,6 +398,11 @@
   void
   write_specific_type_functions();
 
+  // Whether we are done writing out specific type functions.
+  bool
+  specific_type_functions_are_written() const
+  { return this->specific_type_functions_are_written_; }
+
   // Traverse the tree.  See the Traverse class.
   void
   traverse(Traverse*);
diff -r 90c26bab1684 go/types.cc
--- a/go/types.cc	Wed Mar 07 08:04:32 2012 -0800
+++ b/go/types.cc	Wed Mar 07 13:50:47 2012 -0800
@@ -1790,6 +1790,12 @@
 {
   Location bloc = Linemap::predeclared_location();
 
+  if (gogo->specific_type_functions_are_written())
+    {
+      go_assert(saw_errors());
+      return;
+    }
+
   Named_object* hash_fn = gogo->start_function(hash_name, hash_fntype, false,
 					       bloc);
   gogo->start_block(bloc);