core: use reflect.TypeFor (#32320)

golang/go#60088

Author: cuiweixie

core/forkid/forkid.go

@@ -241,9 +241,8 @@ func checksumToBytes(hash uint32) [4]byte {
 // them, one for the block number based forks and the second for the timestamps.
 func gatherForks(config *params.ChainConfig, genesis uint64) ([]uint64, []uint64) {
 	// Gather all the fork block numbers via reflection
-	kind := reflect.TypeOf(params.ChainConfig{})
+	kind := reflect.TypeFor[params.ChainConfig]()
 	conf := reflect.ValueOf(config).Elem()
-	x := uint64(0)
 	var (
 		forksByBlock []uint64
 		forksByTime  []uint64
@@ -258,12 +257,12 @@ func gatherForks(config *params.ChainConfig, genesis uint64) ([]uint64, []uint64
 		}
 
 		// Extract the fork rule block number or timestamp and aggregate it
-		if field.Type == reflect.TypeOf(&x) {
+		if field.Type == reflect.TypeFor[*uint64]() {
 			if rule := conf.Field(i).Interface().(*uint64); rule != nil {
 				forksByTime = append(forksByTime, *rule)
 			}
 		}
-		if field.Type == reflect.TypeOf(new(big.Int)) {
+		if field.Type == reflect.TypeFor[*big.Int]() {
 			if rule := conf.Field(i).Interface().(*big.Int); rule != nil {
 				forksByBlock = append(forksByBlock, rule.Uint64())
 			}

core/tracing/journal_test.go

@@ -293,7 +293,7 @@ func newTracerAllHooks() *tracerAllHooks {
 	t := &tracerAllHooks{hooksCalled: make(map[string]bool)}
 	// Initialize all hooks to false. We will use this to
 	// get total count of hooks.
-	hooksType := reflect.TypeOf((*Hooks)(nil)).Elem()
+	hooksType := reflect.TypeFor[Hooks]()
 	for i := 0; i < hooksType.NumField(); i++ {
 		t.hooksCalled[hooksType.Field(i).Name] = false
 	}

core/types/block.go

@@ -128,7 +128,7 @@ func (h *Header) Hash() common.Hash {
 	return rlpHash(h)
 }
 
-var headerSize = common.StorageSize(reflect.TypeOf(Header{}).Size())
+var headerSize = common.StorageSize(reflect.TypeFor[Header]().Size())
 
 // Size returns the approximate memory used by all internal contents. It is used
 // to approximate and limit the memory consumption of various caches.

core/types/withdrawal.go

@@ -49,7 +49,7 @@ type Withdrawals []*Withdrawal
 // Len returns the length of s.
 func (s Withdrawals) Len() int { return len(s) }
 
-var withdrawalSize = int(reflect.TypeOf(Withdrawal{}).Size())
+var withdrawalSize = int(reflect.TypeFor[Withdrawal]().Size())
 
 func (s Withdrawals) Size() int {
 	return withdrawalSize * len(s)