Revert "core: use slices package for sorting (ethereum#27489)"

This reverts commit d7a94d9.

core/blockchain.go

@@ -23,6 +23,7 @@ import (
 	"io"
 	"math/big"
 	"runtime"
+	"sort"
 	"strings"
 	"sync"
 	"sync/atomic"
@@ -47,7 +48,6 @@ import (
 	"github.com/ethereum/go-ethereum/params"
 	"github.com/ethereum/go-ethereum/rlp"
 	"github.com/ethereum/go-ethereum/trie"
-	"golang.org/x/exp/slices"
 )
 
 var (
@@ -1015,8 +1015,8 @@ func (bc *BlockChain) procFutureBlocks() {
 		}
 	}
 	if len(blocks) > 0 {
-		slices.SortFunc(blocks, func(a, b *types.Block) bool {
-			return a.NumberU64() < b.NumberU64()
+		sort.Slice(blocks, func(i, j int) bool {
+			return blocks[i].NumberU64() < blocks[j].NumberU64()
 		})
 		// Insert one by one as chain insertion needs contiguous ancestry between blocks
 		for i := range blocks {

core/forkid/forkid.go

@@ -24,13 +24,13 @@ import (
 	"math"
 	"math/big"
 	"reflect"
+	"sort"
 	"strings"
 
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/log"
 	"github.com/ethereum/go-ethereum/params"
-	"golang.org/x/exp/slices"
 )
 
 var (
@@ -270,8 +270,8 @@ func gatherForks(config *params.ChainConfig) ([]uint64, []uint64) {
 			}
 		}
 	}
-	slices.Sort(forksByBlock)
-	slices.Sort(forksByTime)
+	sort.Slice(forksByBlock, func(i, j int) bool { return forksByBlock[i] < forksByBlock[j] })
+	sort.Slice(forksByTime, func(i, j int) bool { return forksByTime[i] < forksByTime[j] })
 
 	// Deduplicate fork identifiers applying multiple forks
 	for i := 1; i < len(forksByBlock); i++ {

core/mkalloc.go

@@ -30,28 +30,32 @@ import (
 	"fmt"
 	"math/big"
 	"os"
+	"sort"
 	"strconv"
 
 	"github.com/ethereum/go-ethereum/core"
 	"github.com/ethereum/go-ethereum/rlp"
-	"golang.org/x/exp/slices"
 )
 
 type allocItem struct{ Addr, Balance *big.Int }
 
-func makelist(g *core.Genesis) []allocItem {
-	items := make([]allocItem, 0, len(g.Alloc))
+type allocList []allocItem
+
+func (a allocList) Len() int           { return len(a) }
+func (a allocList) Less(i, j int) bool { return a[i].Addr.Cmp(a[j].Addr) < 0 }
+func (a allocList) Swap(i, j int)      { a[i], a[j] = a[j], a[i] }
+
+func makelist(g *core.Genesis) allocList {
+	a := make(allocList, 0, len(g.Alloc))
 	for addr, account := range g.Alloc {
 		if len(account.Storage) > 0 || len(account.Code) > 0 || account.Nonce != 0 {
 			panic(fmt.Sprintf("can't encode account %x", addr))
 		}
 		bigAddr := new(big.Int).SetBytes(addr.Bytes())
-		items = append(items, allocItem{bigAddr, account.Balance})
+		a = append(a, allocItem{bigAddr, account.Balance})
 	}
-	slices.SortFunc(items, func(a, b allocItem) bool {
-		return a.Addr.Cmp(b.Addr) < 0
-	})
-	return items
+	sort.Sort(a)
+	return a
 }
 
 func makealloc(g *core.Genesis) string {

core/rawdb/accessors_chain.go

@@ -22,6 +22,7 @@ import (
 	"errors"
 	"fmt"
 	"math/big"
+	"sort"
 
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core/types"
@@ -30,7 +31,6 @@ import (
 	"github.com/ethereum/go-ethereum/log"
 	"github.com/ethereum/go-ethereum/params"
 	"github.com/ethereum/go-ethereum/rlp"
-	"golang.org/x/exp/slices"
 )
 
 // ReadCanonicalHash retrieves the hash assigned to a canonical block number.
@@ -836,13 +836,23 @@ type badBlock struct {
 	Body   *types.Body
 }
 
+// badBlockList implements the sort interface to allow sorting a list of
+// bad blocks by their number in the reverse order.
+type badBlockList []*badBlock
+
+func (s badBlockList) Len() int { return len(s) }
+func (s badBlockList) Less(i, j int) bool {
+	return s[i].Header.Number.Uint64() < s[j].Header.Number.Uint64()
+}
+func (s badBlockList) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
+
 // ReadBadBlock retrieves the bad block with the corresponding block hash.
 func ReadBadBlock(db ethdb.Reader, hash common.Hash) *types.Block {
 	blob, err := db.Get(badBlockKey)
 	if err != nil {
 		return nil
 	}
-	var badBlocks []*badBlock
+	var badBlocks badBlockList
 	if err := rlp.DecodeBytes(blob, &badBlocks); err != nil {
 		return nil
 	}
@@ -861,7 +871,7 @@ func ReadAllBadBlocks(db ethdb.Reader) []*types.Block {
 	if err != nil {
 		return nil
 	}
-	var badBlocks []*badBlock
+	var badBlocks badBlockList
 	if err := rlp.DecodeBytes(blob, &badBlocks); err != nil {
 		return nil
 	}
@@ -879,7 +889,7 @@ func WriteBadBlock(db ethdb.KeyValueStore, block *types.Block) {
 	if err != nil {
 		log.Warn("Failed to load old bad blocks", "error", err)
 	}
-	var badBlocks []*badBlock
+	var badBlocks badBlockList
 	if len(blob) > 0 {
 		if err := rlp.DecodeBytes(blob, &badBlocks); err != nil {
 			log.Crit("Failed to decode old bad blocks", "error", err)
@@ -895,10 +905,7 @@ func WriteBadBlock(db ethdb.KeyValueStore, block *types.Block) {
 		Header: block.Header(),
 		Body:   block.Body(),
 	})
-	slices.SortFunc(badBlocks, func(a, b *badBlock) bool {
-		// Note: sorting in descending number order.
-		return a.Header.Number.Uint64() >= b.Header.Number.Uint64()
-	})
+	sort.Sort(sort.Reverse(badBlocks))
 	if len(badBlocks) > badBlockToKeep {
 		badBlocks = badBlocks[:badBlockToKeep]
 	}

core/rawdb/chain_iterator_test.go

@@ -19,12 +19,12 @@ package rawdb
 import (
 	"math/big"
 	"reflect"
+	"sort"
 	"sync"
 	"testing"
 
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core/types"
-	"golang.org/x/exp/slices"
 )
 
 func TestChainIterator(t *testing.T) {
@@ -92,11 +92,9 @@ func TestChainIterator(t *testing.T) {
 			}
 		}
 		if !c.reverse {
-			slices.Sort(numbers)
+			sort.Ints(numbers)
 		} else {
-			slices.SortFunc(numbers, func(a, b int) bool {
-				return a > b // Sort descending
-			})
+			sort.Sort(sort.Reverse(sort.IntSlice(numbers)))
 		}
 		if !reflect.DeepEqual(numbers, c.expect) {
 			t.Fatalf("Case %d failed, visit element mismatch, want %v, got %v", i, c.expect, numbers)

core/state/snapshot/difflayer.go

@@ -21,6 +21,7 @@ import (
 	"fmt"
 	"math"
 	"math/rand"
+	"sort"
 	"sync"
 	"sync/atomic"
 	"time"
@@ -29,7 +30,6 @@ import (
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/rlp"
 	bloomfilter "github.com/holiman/bloomfilter/v2"
-	"golang.org/x/exp/slices"
 )
 
 var (
@@ -525,7 +525,7 @@ func (dl *diffLayer) AccountList() []common.Hash {
 			dl.accountList = append(dl.accountList, hash)
 		}
 	}
-	slices.SortFunc(dl.accountList, common.Hash.Less)
+	sort.Sort(hashes(dl.accountList))
 	dl.memory += uint64(len(dl.accountList) * common.HashLength)
 	return dl.accountList
 }
@@ -563,7 +563,7 @@ func (dl *diffLayer) StorageList(accountHash common.Hash) ([]common.Hash, bool)
 	for k := range storageMap {
 		storageList = append(storageList, k)
 	}
-	slices.SortFunc(storageList, common.Hash.Less)
+	sort.Sort(hashes(storageList))
 	dl.storageList[accountHash] = storageList
 	dl.memory += uint64(len(dl.storageList)*common.HashLength + common.HashLength)
 	return storageList, destructed

core/state/snapshot/iterator_fast.go

@@ -22,7 +22,6 @@ import (
 	"sort"
 
 	"github.com/ethereum/go-ethereum/common"
-	"golang.org/x/exp/slices"
 )
 
 // weightedIterator is a iterator with an assigned weight. It is used to prioritise
@@ -33,10 +32,18 @@ type weightedIterator struct {
 	priority int
 }
 
-func (it *weightedIterator) Less(other *weightedIterator) bool {
+// weightedIterators is a set of iterators implementing the sort.Interface.
+type weightedIterators []*weightedIterator
+
+// Len implements sort.Interface, returning the number of active iterators.
+func (its weightedIterators) Len() int { return len(its) }
+
+// Less implements sort.Interface, returning which of two iterators in the stack
+// is before the other.
+func (its weightedIterators) Less(i, j int) bool {
 	// Order the iterators primarily by the account hashes
-	hashI := it.it.Hash()
-	hashJ := other.it.Hash()
+	hashI := its[i].it.Hash()
+	hashJ := its[j].it.Hash()
 
 	switch bytes.Compare(hashI[:], hashJ[:]) {
 	case -1:
@@ -45,7 +52,12 @@ func (it *weightedIterator) Less(other *weightedIterator) bool {
 		return false
 	}
 	// Same account/storage-slot in multiple layers, split by priority
-	return it.priority < other.priority
+	return its[i].priority < its[j].priority
+}
+
+// Swap implements sort.Interface, swapping two entries in the iterator stack.
+func (its weightedIterators) Swap(i, j int) {
+	its[i], its[j] = its[j], its[i]
 }
 
 // fastIterator is a more optimized multi-layer iterator which maintains a
@@ -57,7 +69,7 @@ type fastIterator struct {
 	curAccount []byte
 	curSlot    []byte
 
-	iterators []*weightedIterator
+	iterators weightedIterators
 	initiated bool
 	account   bool
 	fail      error
@@ -155,9 +167,7 @@ func (fi *fastIterator) init() {
 		}
 	}
 	// Re-sort the entire list
-	slices.SortFunc(fi.iterators, func(a, b *weightedIterator) bool {
-		return a.Less(b)
-	})
+	sort.Sort(fi.iterators)
 	fi.initiated = false
 }
 

core/state/snapshot/sort.go

@@ -0,0 +1,36 @@
+// Copyright 2019 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package snapshot
+
+import (
+	"bytes"
+
+	"github.com/ethereum/go-ethereum/common"
+)
+
+// hashes is a helper to implement sort.Interface.
+type hashes []common.Hash
+
+// Len is the number of elements in the collection.
+func (hs hashes) Len() int { return len(hs) }
+
+// Less reports whether the element with index i should sort before the element
+// with index j.
+func (hs hashes) Less(i, j int) bool { return bytes.Compare(hs[i][:], hs[j][:]) < 0 }
+
+// Swap swaps the elements with indexes i and j.
+func (hs hashes) Swap(i, j int) { hs[i], hs[j] = hs[j], hs[i] }