[llgo] Roll gofrontend forward

Switch gofrontend to using go.googlesource.com, and
update to 81eb6a3f425b2158c67ee32c0cc973a72ce9d6be.

There are various changes required to update to the
go 1.5 runtime:

typemap.go is changed to accommodate the change in representation for equal/hash algorithms, and the removal of the zero value/type.
CMakeLists.txt is updated to add the build tree to the package search path, so internal packages, which are not installed, are found.
various files changes due to removal of __go_new_nopointers; the same change as in D11863, but with NoUnwindAttribute added to the added runtime functions which are called with "callOnly".
minor cleanups in ssa.go while investigating issues with unwinding/panic handling.

Differential Revisision: http://reviews.llvm.org/D15188

llvm-svn: 263536

1 files changed, 47 insertions, 0 deletions

diff --git a/llgo/third_party/gofrontend/libgo/go/runtime/env_test.go b/llgo/third_party/gofrontend/libgo/go/runtime/env_test.go
new file mode 100644
index 00000000000..2399e46faa9
--- /dev/null
+++ b/llgo/third_party/gofrontend/libgo/go/runtime/env_test.go
@@ -0,0 +1,47 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package runtime_test
+
+import (
+	"runtime"
+	"syscall"
+	"testing"
+)
+
+func TestFixedGOROOT(t *testing.T) {
+	if runtime.GOOS == "plan9" {
+		t.Skipf("skipping plan9, it is inconsistent by allowing GOROOT to be updated by Setenv")
+	}
+
+	// Restore both the real GOROOT environment variable, and runtime's copies:
+	if orig, ok := syscall.Getenv("GOROOT"); ok {
+		defer syscall.Setenv("GOROOT", orig)
+	} else {
+		defer syscall.Unsetenv("GOROOT")
+	}
+	envs := runtime.Envs()
+	oldenvs := append([]string{}, envs...)
+	defer runtime.SetEnvs(oldenvs)
+
+	// attempt to reuse existing envs backing array.
+	want := runtime.GOROOT()
+	runtime.SetEnvs(append(envs[:0], "GOROOT="+want))
+
+	if got := runtime.GOROOT(); got != want {
+		t.Errorf(`initial runtime.GOROOT()=%q, want %q`, got, want)
+	}
+	if err := syscall.Setenv("GOROOT", "/os"); err != nil {
+		t.Fatal(err)
+	}
+	if got := runtime.GOROOT(); got != want {
+		t.Errorf(`after setenv runtime.GOROOT()=%q, want %q`, got, want)
+	}
+	if err := syscall.Unsetenv("GOROOT"); err != nil {
+		t.Fatal(err)
+	}
+	if got := runtime.GOROOT(); got != want {
+		t.Errorf(`after unsetenv runtime.GOROOT()=%q, want %q`, got, want)
+	}
+}