libgo: update to Go1.16beta1 release

This does not yet include support for the //go:embed directive added
in this release.

	* Makefile.am (check-runtime): Don't create check-runtime-dir.
	(mostlyclean-local): Don't remove check-runtime-dir.
	(check-go-tool, check-vet): Copy in go.mod and modules.txt.
	(check-cgo-test, check-carchive-test): Add go.mod file.
	* Makefile.in: Regenerate.

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/280172

1 files changed, 22 insertions, 11 deletions

diff --git a/libgo/go/cmd/internal/objabi/line.go b/libgo/go/cmd/internal/objabi/line.go
index 178c836..0733b65 100644
--- a/libgo/go/cmd/internal/objabi/line.go
+++ b/libgo/go/cmd/internal/objabi/line.go
@@ -37,25 +37,36 @@ func AbsFile(dir, file, rewrites string) string {
 		abs = filepath.Join(dir, file)
 	}
 
+	abs, rewritten := ApplyRewrites(abs, rewrites)
+	if !rewritten && hasPathPrefix(abs, GOROOT) {
+		abs = "$GOROOT" + abs[len(GOROOT):]
+	}
+
+	if abs == "" {
+		abs = "??"
+	}
+	return abs
+}
+
+// ApplyRewrites returns the filename for file in the given directory,
+// as rewritten by the rewrites argument.
+//
+// The rewrites argument is a ;-separated list of rewrites.
+// Each rewrite is of the form "prefix" or "prefix=>replace",
+// where prefix must match a leading sequence of path elements
+// and is either removed entirely or replaced by the replacement.
+func ApplyRewrites(file, rewrites string) (string, bool) {
 	start := 0
 	for i := 0; i <= len(rewrites); i++ {
 		if i == len(rewrites) || rewrites[i] == ';' {
-			if new, ok := applyRewrite(abs, rewrites[start:i]); ok {
-				abs = new
-				goto Rewritten
+			if new, ok := applyRewrite(file, rewrites[start:i]); ok {
+				return new, true
 			}
 			start = i + 1
 		}
 	}
-	if hasPathPrefix(abs, GOROOT) {
-		abs = "$GOROOT" + abs[len(GOROOT):]
-	}
 
-Rewritten:
-	if abs == "" {
-		abs = "??"
-	}
-	return abs
+	return file, false
 }
 
 // applyRewrite applies the rewrite to the path,