cmd/compile: rename gc.exportname to types.IsExported

gofmt -r 'exportname(s) -> types.IsExported(s)'

Passes toolstash-check.

Change-Id: I6b428bd039c135be66d8b81c325d4e08bae69f24
Reviewed-on: https://go-review.googlesource.com/105938
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

1 files changed, 12 insertions, 0 deletions

diff --git a/src/cmd/compile/internal/types/sym.go b/src/cmd/compile/internal/types/sym.go
index 00328fa44f..e9b454d83a 100644
--- a/src/cmd/compile/internal/types/sym.go
+++ b/src/cmd/compile/internal/types/sym.go
@@ -7,6 +7,8 @@ package types
 import (
 	"cmd/internal/obj"
 	"cmd/internal/src"
+	"unicode"
+	"unicode/utf8"
 )
 
 // Sym represents an object name. Most commonly, this is a Go identifier naming
@@ -74,3 +76,13 @@ func (sym *Sym) Linksym() *obj.LSym {
 	}
 	return Ctxt.Lookup(sym.LinksymName())
 }
+
+// IsExported reports whether name is an exported Go symbol (that is,
+// whether it begins with an upper-case letter).
+func IsExported(name string) bool {
+	if r := name[0]; r < utf8.RuneSelf {
+		return 'A' <= r && r <= 'Z'
+	}
+	r, _ := utf8.DecodeRuneInString(name)
+	return unicode.IsUpper(r)
+}