cmd/compile: use bufio.Reader directly in lexer

Removes an intermediate layer of functions that was clogging up a
corner of the compiler's profile graph.

I can't measure a performance improvement running a large build
like jujud, but the profile reports less total time spent in
gc.(*lexer).getr.

Change-Id: I3000585cfcb0f9729d3a3859e9023690a6528591
Reviewed-on: https://go-review.googlesource.com/20565
Reviewed-by: Robert Griesemer <gri@golang.org>
Run-TryBot: David Crawshaw <crawshaw@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

1 files changed, 0 insertions, 23 deletions

diff --git a/src/cmd/internal/obj/util.go b/src/cmd/internal/obj/util.go
index 4c37f76ca9..bd533a0036 100644
--- a/src/cmd/internal/obj/util.go
+++ b/src/cmd/internal/obj/util.go
@@ -129,18 +129,6 @@ func Bgetc(b *Biobuf) int {
 	return int(c)
 }
 
-func Bgetrune(b *Biobuf) int {
-	r, _, err := b.r.ReadRune()
-	if err != nil {
-		return -1
-	}
-	return int(r)
-}
-
-func Bungetrune(b *Biobuf) {
-	b.r.UnreadRune()
-}
-
 func (b *Biobuf) Read(p []byte) (int, error) {
 	return b.r.Read(p)
 }
@@ -158,17 +146,6 @@ func Brdline(b *Biobuf, delim int) string {
 	return string(s)
 }
 
-func Brdstr(b *Biobuf, delim int, cut int) string {
-	s, err := b.r.ReadString(byte(delim))
-	if err != nil {
-		log.Fatalf("reading input: %v", err)
-	}
-	if len(s) > 0 && cut > 0 {
-		s = s[:len(s)-1]
-	}
-	return s
-}
-
 func Blinelen(b *Biobuf) int {
 	return b.linelen
 }