From: Ian Lance Taylor <ian@gcc.gnu.org>
Date: Mon, 30 Mar 2015 17:32:06 +0000 (+0000)
Subject: compiler: implement Go 1 unsafe.Pointer conversion rules
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=c40b69ae69f5e510704ee0b4a1a293057a6f4cd2;p=gcc.git

compiler: implement Go 1 unsafe.Pointer conversion rules

Any type whose underlying type is uintptr can be converted
to unsafe.Pointer, and vice versa.

Fixes golang/go#10284.

From-SVN: r221774
---

diff --git a/gcc/go/gofrontend/types.cc b/gcc/go/gofrontend/types.cc
index 785889fb5c8..e93c6811d08 100644
--- a/gcc/go/gofrontend/types.cc
+++ b/gcc/go/gofrontend/types.cc
@@ -772,16 +772,16 @@ Type::are_convertible(const Type* lhs, const Type* rhs, std::string* reason)
     }
 
   // An unsafe.Pointer type may be converted to any pointer type or to
-  // uintptr, and vice-versa.
+  // a type whose underlying type is uintptr, and vice-versa.
   if (lhs->is_unsafe_pointer_type()
       && (rhs->points_to() != NULL
 	  || (rhs->integer_type() != NULL
-	      && rhs->forwarded() == Type::lookup_integer_type("uintptr"))))
+	      && rhs->integer_type() == Type::lookup_integer_type("uintptr")->real_type())))
     return true;
   if (rhs->is_unsafe_pointer_type()
       && (lhs->points_to() != NULL
 	  || (lhs->integer_type() != NULL
-	      && lhs->forwarded() == Type::lookup_integer_type("uintptr"))))
+	      && lhs->integer_type() == Type::lookup_integer_type("uintptr")->real_type())))
     return true;
 
   // Give a better error message.