use slices.Sort to eliminate bounds check (#1128)

Signed-off-by: Weizhen Wang <wangweizhen@pingcap.com>

.github/workflows/test.yml

@@ -15,7 +15,7 @@ jobs:
     - name: Set up Go
       uses: actions/setup-go@v4
       with:
-        go-version: 1.21.0
+        go-version: 1.21.6
 
     - name: Test
       run: go test ./...
@@ -28,7 +28,7 @@ jobs:
     - name: Set up Go
       uses: actions/setup-go@v4
       with:
-        go-version: 1.21.0
+        go-version: 1.21.6
 
     - name: Test with race
       run: go test -race ./...
@@ -42,10 +42,10 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v4
         with:
-          go-version: 1.21.0
+          go-version: 1.21.6
 
       - name: Lint
         uses: golangci/golangci-lint-action@v3
         with:
-          version: v1.51.2
+          version: v1.55.2
 

.golangci.yml

@@ -4,7 +4,7 @@ linters:
   disable-all: true
   enable:
     - bodyclose
-    - depguard
+    #- depguard
     - exportloopref
     - gofmt
     - goimports

internal/mockstore/mocktikv/cluster.go

@@ -38,6 +38,7 @@ import (
 	"bytes"
 	"context"
 	"math"
+	"slices"
 	"sort"
 	"sync"
 	"time"
@@ -358,8 +359,8 @@ func (c *Cluster) ScanRegions(startKey, endKey []byte, limit int, opts ...pd.Get
 		regions = append(regions, region)
 	}
 
-	sort.Slice(regions, func(i, j int) bool {
-		return bytes.Compare(regions[i].Meta.GetStartKey(), regions[j].Meta.GetStartKey()) < 0
+	slices.SortFunc(regions, func(i, j *Region) int {
+		return bytes.Compare(i.Meta.GetStartKey(), j.Meta.GetStartKey())
 	})
 
 	startPos := sort.Search(len(regions), func(i int) bool {

internal/unionstore/memdb.go

@@ -38,7 +38,6 @@ import (
 	"bytes"
 	"fmt"
 	"math"
-	"reflect"
 	"sync"
 	"unsafe"
 
@@ -837,12 +836,8 @@ func (n *memdbNode) setBlack() {
 }
 
 func (n *memdbNode) getKey() []byte {
-	var ret []byte
-	hdr := (*reflect.SliceHeader)(unsafe.Pointer(&ret))
-	hdr.Data = uintptr(unsafe.Pointer(&n.flags)) + kv.FlagBytes
-	hdr.Len = int(n.klen)
-	hdr.Cap = int(n.klen)
-	return ret
+	base := unsafe.Add(unsafe.Pointer(&n.flags), kv.FlagBytes)
+	return unsafe.Slice((*byte)(base), int(n.klen))
 }
 
 const (

txnkv/transaction/txn.go

@@ -43,6 +43,7 @@ import (
 	"math"
 	"math/rand"
 	"runtime/trace"
+	"slices"
 	"sort"
 	"sync"
 	"sync/atomic"
@@ -1314,8 +1315,8 @@ func deduplicateKeys(keys [][]byte) [][]byte {
 		return keys
 	}
 
-	sort.Slice(keys, func(i, j int) bool {
-		return bytes.Compare(keys[i], keys[j]) < 0
+	slices.SortFunc(keys, func(i, j []byte) int {
+		return bytes.Compare(i, j)
 	})
 	deduped := keys[:1]
 	for i := 1; i < len(keys); i++ {

util/misc.go

@@ -38,7 +38,6 @@ import (
 	"context"
 	"encoding/hex"
 	"fmt"
-	"reflect"
 	"strconv"
 	"strings"
 	"time"
@@ -168,11 +167,7 @@ func String(b []byte) (s string) {
 	if len(b) == 0 {
 		return ""
 	}
-	pbytes := (*reflect.SliceHeader)(unsafe.Pointer(&b))
-	pstring := (*reflect.StringHeader)(unsafe.Pointer(&s))
-	pstring.Data = pbytes.Data
-	pstring.Len = pbytes.Len
-	return
+	return unsafe.String(unsafe.SliceData(b), len(b))
 }
 
 // ToUpperASCIIInplace bytes.ToUpper but zero-cost