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internal/profile: optimize Parse allocs #76145

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internal/profile: optimize Parse allocs #76145

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19 changes: 18 additions & 1 deletion src/internal/profile/proto.go
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Original file line number Diff line number Diff line change
Expand Up @@ -24,6 +24,7 @@ package profile
import (
"errors"
"fmt"
"slices"
)

type buffer struct {
Expand Down Expand Up @@ -175,6 +176,16 @@ func le32(p []byte) uint32 {
return uint32(p[0]) | uint32(p[1])<<8 | uint32(p[2])<<16 | uint32(p[3])<<24
}

func peekNumVarints(data []byte) (numVarints int) {
for ; len(data) > 0; numVarints++ {
var err error
if _, data, err = decodeVarint(data); err != nil {
break
}
}
return numVarints
}

func decodeVarint(data []byte) (uint64, []byte, error) {
var i int
var u uint64
Expand Down Expand Up @@ -275,6 +286,9 @@ func decodeInt64(b *buffer, x *int64) error {
func decodeInt64s(b *buffer, x *[]int64) error {
if b.typ == 2 {
// Packed encoding
dataLen := peekNumVarints(b.data)
*x = slices.Grow(*x, dataLen)

data := b.data
for len(data) > 0 {
var u uint64
Expand Down Expand Up @@ -305,8 +319,11 @@ func decodeUint64(b *buffer, x *uint64) error {

func decodeUint64s(b *buffer, x *[]uint64) error {
if b.typ == 2 {
data := b.data
// Packed encoding
dataLen := peekNumVarints(b.data)
*x = slices.Grow(*x, dataLen)

data := b.data
for len(data) > 0 {
var u uint64
var err error
Expand Down