Go patch committed: Permit inlining receive expressions

[Ian Lance Taylor]

This patch to the Go frontend permits inlining functions with receive
expressions.  This does not permit any new inlinable functions in the
standard library.  Bootstrapped and ran Go testsuite on
x86_64-pc-linux-gnu.  Committed to mainline.

Ian
-------------- next part --------------
Index: gcc/go/gofrontend/MERGE
===================================================================
--- gcc/go/gofrontend/MERGE	(revision 271063)
+++ gcc/go/gofrontend/MERGE	(working copy)
@@ -1,4 +1,4 @@
-b5e4ba88a2e7f3c34e9183f43370c38ea639c393
+76ab85364745e445498fe53f9ca8e37b49650779
 
 The first line of this file holds the git revision number of the last
 merge done from the gofrontend repository.
Index: gcc/go/gofrontend/expressions.cc
===================================================================
--- gcc/go/gofrontend/expressions.cc	(revision 271063)
+++ gcc/go/gofrontend/expressions.cc	(working copy)
@@ -15423,6 +15423,15 @@ Receive_expression::do_get_backend(Trans
   return Expression::make_compound(recv, recv_ref, loc)->get_backend(context);
 }
 
+// Export a receive expression.
+
+void
+Receive_expression::do_export(Export_function_body* efb) const
+{
+  efb->write_c_string("<-");
+  this->channel_->export_expression(efb);
+}
+
 // Dump ast representation for a receive expression.
 
 void
@@ -15432,6 +15441,16 @@ Receive_expression::do_dump_expression(A
   ast_dump_context->dump_expression(channel_);
 }
 
+// Import a receive expression.
+
+Expression*
+Receive_expression::do_import(Import_expression* imp, Location loc)
+{
+  imp->require_c_string("<-");
+  Expression* expr = Expression::import_expression(imp, loc);
+  return Expression::make_receive(expr, loc);
+}
+
 // Make a receive expression.
 
 Receive_expression*
@@ -16783,6 +16802,8 @@ Expression::import_expression(Import_exp
       // This handles integers, floats and complex constants.
       return Integer_expression::do_import(imp, loc);
     }
+  else if (imp->match_c_string("<-"))
+    return Receive_expression::do_import(imp, loc);
   else if (imp->match_c_string("$nil")
 	   || (imp->version() < EXPORT_FORMAT_V3
 	       && imp->match_c_string("nil")))
Index: gcc/go/gofrontend/expressions.h
===================================================================
--- gcc/go/gofrontend/expressions.h	(revision 271021)
+++ gcc/go/gofrontend/expressions.h	(working copy)
@@ -3982,6 +3982,9 @@ class Receive_expression : public Expres
   channel()
   { return this->channel_; }
 
+  static Expression*
+  do_import(Import_expression*, Location);
+
  protected:
   int
   do_traverse(Traverse* traverse)
@@ -4010,6 +4013,10 @@ class Receive_expression : public Expres
     return Expression::make_receive(this->channel_->copy(), this->location());
   }
 
+  int
+  do_inlining_cost() const
+  { return 1; }
+
   bool
   do_must_eval_in_order() const
   { return true; }
@@ -4018,6 +4025,9 @@ class Receive_expression : public Expres
   do_get_backend(Translate_context*);
 
   void
+  do_export(Export_function_body*) const;
+
+  void
   do_dump_expression(Ast_dump_context*) const;
 
  private: