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Go patch committed: fix check for notinheap conversion

From: Ian Lance Taylor <iant at golang dot org>
To: gcc-patches <gcc-patches at gcc dot gnu dot org>, "gofrontend-dev at googlegroups dot com" <gofrontend-dev at googlegroups dot com>
Date: Wed, 13 Sep 2017 20:45:47 -0700
Subject: Go patch committed: fix check for notinheap conversion
Authentication-results: sourceware.org; auth=none

In the Go frontend, a normal pointer may not be converted to a
notinheap pointer.  The frontend was erroneously permitting a
conversion from a normal pointer to a notinheap unsafe.Pointer, which
is useless since unsafe.Pointer is not marked notinheap.  This patch
corrects the test to permit a conversion from unsafe.Pointer to a
notinheap pointer, which is the same test that the gc compiler uses.

The test case for this is in the upcoming 1.9 runtime package.

Bootstrapped and ran Go testsuite on x86_64-pc-linux-gnu.  Committed
to mainline.

Ian

Attachment: patch.txt
Description: Text document

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