[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

4 files changed, 42 insertions, 2 deletions

diff --git a/llgo/third_party/gofrontend/libgo/go/runtime/debug/garbage.go b/llgo/third_party/gofrontend/libgo/go/runtime/debug/garbage.go
index edb3643871e..c3363f9dd58 100644
--- a/llgo/third_party/gofrontend/libgo/go/runtime/debug/garbage.go
+++ b/llgo/third_party/gofrontend/libgo/go/runtime/debug/garbage.go
@@ -149,5 +149,5 @@ func SetPanicOnFault(enabled bool) bool
 
 // WriteHeapDump writes a description of the heap and the objects in
 // it to the given file descriptor.
-// The heap dump format is defined at http://golang.org/s/go13heapdump.
+// The heap dump format is defined at https://golang.org/s/go13heapdump.
 func WriteHeapDump(fd uintptr)
diff --git a/llgo/third_party/gofrontend/libgo/go/runtime/debug/garbage_test.go b/llgo/third_party/gofrontend/libgo/go/runtime/debug/garbage_test.go
index 149bafc6f3c..13e1845098e 100644
--- a/llgo/third_party/gofrontend/libgo/go/runtime/debug/garbage_test.go
+++ b/llgo/third_party/gofrontend/libgo/go/runtime/debug/garbage_test.go
@@ -75,6 +75,10 @@ func TestReadGCStats(t *testing.T) {
 var big = make([]byte, 1<<20)
 
 func TestFreeOSMemory(t *testing.T) {
+	if runtime.GOARCH == "arm64" || runtime.GOARCH == "ppc64" || runtime.GOARCH == "ppc64le" ||
+		runtime.GOOS == "nacl" {
+		t.Skip("issue 9993; scavenger temporarily disabled on systems with physical pages larger than logical pages")
+	}
 	var ms1, ms2 runtime.MemStats
 
 	if big == nil {
diff --git a/llgo/third_party/gofrontend/libgo/go/runtime/debug/heapdump_test.go b/llgo/third_party/gofrontend/libgo/go/runtime/debug/heapdump_test.go
index 9201901151f..cb2f2f06798 100644
--- a/llgo/third_party/gofrontend/libgo/go/runtime/debug/heapdump_test.go
+++ b/llgo/third_party/gofrontend/libgo/go/runtime/debug/heapdump_test.go
@@ -31,3 +31,39 @@ func TestWriteHeapDumpNonempty(t *testing.T) {
 		t.Fatalf("Heap dump size %d bytes, expected at least %d bytes", size, minSize)
 	}
 }
+
+type Obj struct {
+	x, y int
+}
+
+func objfin(x *Obj) {
+	println("finalized", x)
+}
+
+func TestWriteHeapDumpFinalizers(t *testing.T) {
+	if runtime.GOOS == "nacl" {
+		t.Skip("WriteHeapDump is not available on NaCl.")
+	}
+	f, err := ioutil.TempFile("", "heapdumptest")
+	if err != nil {
+		t.Fatalf("TempFile failed: %v", err)
+	}
+	defer os.Remove(f.Name())
+	defer f.Close()
+
+	// bug 9172: WriteHeapDump couldn't handle more than one finalizer
+	println("allocating objects")
+	x := &Obj{}
+	runtime.SetFinalizer(x, objfin)
+	y := &Obj{}
+	runtime.SetFinalizer(y, objfin)
+
+	// Trigger collection of x and y, queueing of their finalizers.
+	println("starting gc")
+	runtime.GC()
+
+	// Make sure WriteHeapDump doesn't fail with multiple queued finalizers.
+	println("starting dump")
+	WriteHeapDump(f.Fd())
+	println("done dump")
+}
diff --git a/llgo/third_party/gofrontend/libgo/go/runtime/debug/stack.go b/llgo/third_party/gofrontend/libgo/go/runtime/debug/stack.go
index c29b0a226a2..ab12bffa6e5 100644
--- a/llgo/third_party/gofrontend/libgo/go/runtime/debug/stack.go
+++ b/llgo/third_party/gofrontend/libgo/go/runtime/debug/stack.go
@@ -31,7 +31,7 @@ func PrintStack() {
 // then attempts to discover, for Go functions, the calling function or
 // method and the text of the line containing the invocation.
 //
-// This function is deprecated. Use package runtime's Stack instead.
+// Deprecated: Use package runtime's Stack instead.
 func Stack() []byte {
 	return stack()
 }