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bufio: reduce pointer size in structs for better memory alignment and efficiency

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This commit is contained in:
bernoussama 2024-11-16 13:15:12 +01:00
parent ff2376dbe3
commit 95c71fa44e
2 changed files with 7 additions and 5 deletions
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8
src/bufio/bufio.go
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@ -38,8 +38,10 @@ type Reader struct {
lastRuneSize int // size of last rune read for UnreadRune; -1 means invalid lastRuneSize int // size of last rune read for UnreadRune; -1 means invalid
} }
const minReadBufferSize = 16 const (
const maxConsecutiveEmptyReads = 100 minReadBufferSize = 16
maxConsecutiveEmptyReads = 100
)
// NewReaderSize returns a new [Reader] whose buffer has at least the specified // NewReaderSize returns a new [Reader] whose buffer has at least the specified
// size. If the argument io.Reader is already a [Reader] with large enough // size. If the argument io.Reader is already a [Reader] with large enough
@ -575,9 +577,9 @@ func (b *Reader) writeBuf(w io.Writer) (int64, error) {
// the underlying [io.Writer]. // the underlying [io.Writer].
type Writer struct { type Writer struct {
err error err error
wr io.Writer
buf []byte buf []byte
n int n int
wr io.Writer
} }
// NewWriterSize returns a new [Writer] whose buffer has at least the specified // NewWriterSize returns a new [Writer] whose buffer has at least the specified

4
src/bufio/scan.go
View File

@ -28,13 +28,13 @@ import (
// on a reader, should use [bufio.Reader] instead. // on a reader, should use [bufio.Reader] instead.
type Scanner struct { type Scanner struct {
r io.Reader // The reader provided by the client. r io.Reader // The reader provided by the client.
err error // Sticky error.
split SplitFunc // The function to split the tokens. split SplitFunc // The function to split the tokens.
maxTokenSize int // Maximum size of a token; modified by tests.
token []byte // Last token returned by split. token []byte // Last token returned by split.
buf []byte // Buffer used as argument to split. buf []byte // Buffer used as argument to split.
maxTokenSize int // Maximum size of a token; modified by tests.
start int // First non-processed byte in buf. start int // First non-processed byte in buf.
end int // End of data in buf. end int // End of data in buf.
err error // Sticky error.
empties int // Count of successive empty tokens. empties int // Count of successive empty tokens.
scanCalled bool // Scan has been called; buffer is in use. scanCalled bool // Scan has been called; buffer is in use.
done bool // Scan has finished. done bool // Scan has finished.