all: omit unnecessary type conversions

Found by github.com/mdempsky/unconvert

Change-Id: Ib78cceb718146509d96dbb6da87b27dbaeba1306
GitHub-Last-Rev: dedf354811
GitHub-Pull-Request: golang/go#74771
Reviewed-on: https://go-review.googlesource.com/c/go/+/690735
Reviewed-by: Mark Freeman <mark@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Keith Randall <khr@google.com>
Auto-Submit: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>

src/bytes/bytes_test.go

@@ -693,14 +693,14 @@ func bmIndexRuneUnicode(rt *unicode.RangeTable, needle rune) func(b *testing.B,
 	for _, r16 := range rt.R16 {
 		for r := rune(r16.Lo); r <= rune(r16.Hi); r += rune(r16.Stride) {
 			if r != needle {
-				rs = append(rs, rune(r))
+				rs = append(rs, r)
 			}
 		}
 	}
 	for _, r32 := range rt.R32 {
 		for r := rune(r32.Lo); r <= rune(r32.Hi); r += rune(r32.Stride) {
 			if r != needle {
-				rs = append(rs, rune(r))
+				rs = append(rs, r)
 			}
 		}
 	}

src/debug/dwarf/entry.go

@@ -554,7 +554,7 @@ func (b *buf) entry(cu *Entry, u *unit) *Entry {
 		case formData16:
 			val = b.bytes(16)
 		case formSdata:
-			val = int64(b.int())
+			val = b.int()
 		case formUdata:
 			val = int64(b.uint())
 		case formImplicitConst:

src/net/tcpconn_keepalive_test.go

@@ -22,7 +22,7 @@ func TestTCPConnKeepAliveConfigDialer(t *testing.T) {
 		oldCfg  KeepAliveConfig
 	)
 	testPreHookSetKeepAlive = func(nfd *netFD) {
-		oldCfg, errHook = getCurrentKeepAliveSettings(fdType(nfd.pfd.Sysfd))
+		oldCfg, errHook = getCurrentKeepAliveSettings(nfd.pfd.Sysfd)
 	}
 
 	handler := func(ls *localServer, ln Listener) {
@@ -80,7 +80,7 @@ func TestTCPConnKeepAliveConfigListener(t *testing.T) {
 		oldCfg  KeepAliveConfig
 	)
 	testPreHookSetKeepAlive = func(nfd *netFD) {
-		oldCfg, errHook = getCurrentKeepAliveSettings(fdType(nfd.pfd.Sysfd))
+		oldCfg, errHook = getCurrentKeepAliveSettings(nfd.pfd.Sysfd)
 	}
 
 	ch := make(chan Conn, 1)

src/runtime/heapdump.go

@@ -460,7 +460,7 @@ func dumproots() {
 					continue
 				}
 				spf := (*specialfinalizer)(unsafe.Pointer(sp))
-				p := unsafe.Pointer(s.base() + uintptr(spf.special.offset))
+				p := unsafe.Pointer(s.base() + spf.special.offset)
 				dumpfinalizer(p, spf.fn, spf.fint, spf.ot)
 			}
 		}
@@ -659,7 +659,7 @@ func dumpmemprof() {
 				continue
 			}
 			spp := (*specialprofile)(unsafe.Pointer(sp))
-			p := s.base() + uintptr(spp.special.offset)
+			p := s.base() + spp.special.offset
 			dumpint(tagAllocSample)
 			dumpint(uint64(p))
 			dumpint(uint64(uintptr(unsafe.Pointer(spp.b))))

src/runtime/mcleanup.go

@@ -173,14 +173,14 @@ func (c Cleanup) Stop() {
 				// Reached the end of the linked list. Stop searching at this point.
 				break
 			}
-			if offset == uintptr(s.offset) && _KindSpecialCleanup == s.kind &&
+			if offset == s.offset && _KindSpecialCleanup == s.kind &&
 				(*specialCleanup)(unsafe.Pointer(s)).id == c.id {
 				// The special is a cleanup and contains a matching cleanup id.
 				*iter = s.next
 				found = s
 				break
 			}
-			if offset < uintptr(s.offset) || (offset == uintptr(s.offset) && _KindSpecialCleanup < s.kind) {
+			if offset < s.offset || (offset == s.offset && _KindSpecialCleanup < s.kind) {
 				// The special is outside the region specified for that kind of
 				// special. The specials are sorted by kind.
 				break

src/runtime/mgcmark.go

@@ -415,7 +415,7 @@ func gcScanFinalizer(spf *specialfinalizer, s *mspan, gcw *gcWork) {
 	// Don't mark finalized object, but scan it so we retain everything it points to.
 
 	// A finalizer can be set for an inner byte of an object, find object beginning.
-	p := s.base() + uintptr(spf.special.offset)/s.elemsize*s.elemsize
+	p := s.base() + spf.special.offset/s.elemsize*s.elemsize
 
 	// Mark everything that can be reached from
 	// the object (but *not* the object itself or

src/runtime/mgcsweep.go

@@ -553,7 +553,7 @@ func (sl *sweepLocked) sweep(preserve bool) bool {
 	siter := newSpecialsIter(s)
 	for siter.valid() {
 		// A finalizer can be set for an inner byte of an object, find object beginning.
-		objIndex := uintptr(siter.s.offset) / size
+		objIndex := siter.s.offset / size
 		p := s.base() + objIndex*size
 		mbits := s.markBitsForIndex(objIndex)
 		if !mbits.isMarked() {
@@ -561,7 +561,7 @@ func (sl *sweepLocked) sweep(preserve bool) bool {
 			// Pass 1: see if it has a finalizer.
 			hasFinAndRevived := false
 			endOffset := p - s.base() + size
-			for tmp := siter.s; tmp != nil && uintptr(tmp.offset) < endOffset; tmp = tmp.next {
+			for tmp := siter.s; tmp != nil && tmp.offset < endOffset; tmp = tmp.next {
 				if tmp.kind == _KindSpecialFinalizer {
 					// Stop freeing of object if it has a finalizer.
 					mbits.setMarkedNonAtomic()
@@ -573,11 +573,11 @@ func (sl *sweepLocked) sweep(preserve bool) bool {
 				// Pass 2: queue all finalizers and clear any weak handles. Weak handles are cleared
 				// before finalization as specified by the weak package. See the documentation
 				// for that package for more details.
-				for siter.valid() && uintptr(siter.s.offset) < endOffset {
+				for siter.valid() && siter.s.offset < endOffset {
 					// Find the exact byte for which the special was setup
 					// (as opposed to object beginning).
 					special := siter.s
-					p := s.base() + uintptr(special.offset)
+					p := s.base() + special.offset
 					if special.kind == _KindSpecialFinalizer || special.kind == _KindSpecialWeakHandle {
 						siter.unlinkAndNext()
 						freeSpecial(special, unsafe.Pointer(p), size)
@@ -589,11 +589,11 @@ func (sl *sweepLocked) sweep(preserve bool) bool {
 				}
 			} else {
 				// Pass 2: the object is truly dead, free (and handle) all specials.
-				for siter.valid() && uintptr(siter.s.offset) < endOffset {
+				for siter.valid() && siter.s.offset < endOffset {
 					// Find the exact byte for which the special was setup
 					// (as opposed to object beginning).
 					special := siter.s
-					p := s.base() + uintptr(special.offset)
+					p := s.base() + special.offset
 					siter.unlinkAndNext()
 					freeSpecial(special, unsafe.Pointer(p), size)
 				}

src/runtime/mheap.go

@@ -1488,7 +1488,7 @@ func (h *mheap) initSpan(s *mspan, typ spanAllocType, spanclass spanClass, base,
 		s.allocBits = newAllocBits(uintptr(s.nelems))
 
 		// Adjust s.limit down to the object-containing part of the span.
-		s.limit = s.base() + uintptr(s.elemsize)*uintptr(s.nelems)
+		s.limit = s.base() + s.elemsize*uintptr(s.nelems)
 
 		// It's safe to access h.sweepgen without the heap lock because it's
 		// only ever updated with the world stopped and we run on the
@@ -2152,11 +2152,11 @@ func (span *mspan) specialFindSplicePoint(offset uintptr, kind byte) (**special,
 		if s == nil {
 			break
 		}
-		if offset == uintptr(s.offset) && kind == s.kind {
+		if offset == s.offset && kind == s.kind {
 			found = true
 			break
 		}
-		if offset < uintptr(s.offset) || (offset == uintptr(s.offset) && kind < s.kind) {
+		if offset < s.offset || (offset == s.offset && kind < s.kind) {
 			break
 		}
 		iter = &s.next
@@ -2323,14 +2323,14 @@ func getCleanupContext(ptr uintptr, cleanupID uint64) *specialCheckFinalizer {
 				// Reached the end of the linked list. Stop searching at this point.
 				break
 			}
-			if offset == uintptr(s.offset) && _KindSpecialCheckFinalizer == s.kind &&
+			if offset == s.offset && _KindSpecialCheckFinalizer == s.kind &&
 				(*specialCheckFinalizer)(unsafe.Pointer(s)).cleanupID == cleanupID {
 				// The special is a cleanup and contains a matching cleanup id.
 				*iter = s.next
 				found = (*specialCheckFinalizer)(unsafe.Pointer(s))
 				break
 			}
-			if offset < uintptr(s.offset) || (offset == uintptr(s.offset) && _KindSpecialCheckFinalizer < s.kind) {
+			if offset < s.offset || (offset == s.offset && _KindSpecialCheckFinalizer < s.kind) {
 				// The special is outside the region specified for that kind of
 				// special. The specials are sorted by kind.
 				break
@@ -2373,14 +2373,14 @@ func clearCleanupContext(ptr uintptr, cleanupID uint64) {
 				// Reached the end of the linked list. Stop searching at this point.
 				break
 			}
-			if offset == uintptr(s.offset) && _KindSpecialCheckFinalizer == s.kind &&
+			if offset == s.offset && _KindSpecialCheckFinalizer == s.kind &&
 				(*specialCheckFinalizer)(unsafe.Pointer(s)).cleanupID == cleanupID {
 				// The special is a cleanup and contains a matching cleanup id.
 				*iter = s.next
 				found = s
 				break
 			}
-			if offset < uintptr(s.offset) || (offset == uintptr(s.offset) && _KindSpecialCheckFinalizer < s.kind) {
+			if offset < s.offset || (offset == s.offset && _KindSpecialCheckFinalizer < s.kind) {
 				// The special is outside the region specified for that kind of
 				// special. The specials are sorted by kind.
 				break
@@ -2476,7 +2476,7 @@ type specialWeakHandle struct {
 
 //go:linkname internal_weak_runtime_registerWeakPointer weak.runtime_registerWeakPointer
 func internal_weak_runtime_registerWeakPointer(p unsafe.Pointer) unsafe.Pointer {
-	return unsafe.Pointer(getOrAddWeakHandle(unsafe.Pointer(p)))
+	return unsafe.Pointer(getOrAddWeakHandle(p))
 }
 
 //go:linkname internal_weak_runtime_makeStrongFromWeak weak.runtime_makeStrongFromWeak

src/runtime/slice.go

@@ -397,5 +397,5 @@ func bytealg_MakeNoZero(len int) []byte {
 		panicmakeslicelen()
 	}
 	cap := roundupsize(uintptr(len), true)
-	return unsafe.Slice((*byte)(mallocgc(uintptr(cap), nil, false)), cap)[:len]
+	return unsafe.Slice((*byte)(mallocgc(cap, nil, false)), cap)[:len]
 }

src/runtime/traceallocfree.go

@@ -37,7 +37,7 @@ func traceSnapshotMemory(gen uintptr) {
 	}
 
 	// Emit info.
-	w.varint(uint64(trace.minPageHeapAddr))
+	w.varint(trace.minPageHeapAddr)
 	w.varint(uint64(pageSize))
 	w.varint(uint64(gc.MinHeapAlign))
 	w.varint(uint64(fixedStack))

src/runtime/tracebuf.go

@@ -183,7 +183,7 @@ func (w traceWriter) refill() traceWriter {
 	// Tolerate a nil mp.
 	mID := ^uint64(0)
 	if w.mp != nil {
-		mID = uint64(w.mp.procid)
+		mID = w.mp.procid
 	}
 
 	// Write the buffer's header.
@@ -194,7 +194,7 @@ func (w traceWriter) refill() traceWriter {
 		w.byte(byte(w.exp))
 	}
 	w.varint(uint64(w.gen))
-	w.varint(uint64(mID))
+	w.varint(mID)
 	w.varint(uint64(ts))
 	w.traceBuf.lenPos = w.varintReserve()
 	return w

src/runtime/tracecpu.go

@@ -258,7 +258,7 @@ func traceCPUSample(gp *g, mp *m, pp *p, stk []uintptr) {
 	if gp != nil {
 		hdr[1] = gp.goid
 	}
-	hdr[2] = uint64(mp.procid)
+	hdr[2] = mp.procid
 
 	// Allow only one writer at a time
 	for !trace.signalLock.CompareAndSwap(0, 1) {

src/runtime/traceevent.go

@@ -42,7 +42,7 @@ func (tl traceLocker) eventWriter(goStatus tracev2.GoStatus, procStatus tracev2.
 		tl.writer().writeProcStatus(uint64(pp.id), procStatus, pp.trace.inSweep).end()
 	}
 	if gp := tl.mp.curg; gp != nil && !gp.trace.statusWasTraced(tl.gen) && gp.trace.acquireStatus(tl.gen) {
-		tl.writer().writeGoStatus(uint64(gp.goid), int64(tl.mp.procid), goStatus, gp.inMarkAssist, 0 /* no stack */).end()
+		tl.writer().writeGoStatus(gp.goid, int64(tl.mp.procid), goStatus, gp.inMarkAssist, 0 /* no stack */).end()
 	}
 	return traceEventWriter{tl}
 }

src/runtime/traceruntime.go

@@ -457,7 +457,7 @@ func (tl traceLocker) GoPreempt() {
 
 // GoStop emits a GoStop event with the provided reason.
 func (tl traceLocker) GoStop(reason traceGoStopReason) {
-	tl.eventWriter(tracev2.GoRunning, tracev2.ProcRunning).event(tracev2.EvGoStop, traceArg(trace.goStopReasons[tl.gen%2][reason]), tl.stack(0))
+	tl.eventWriter(tracev2.GoRunning, tracev2.ProcRunning).event(tracev2.EvGoStop, trace.goStopReasons[tl.gen%2][reason], tl.stack(0))
 }
 
 // GoPark emits a GoBlock event with the provided reason.
@@ -465,7 +465,7 @@ func (tl traceLocker) GoStop(reason traceGoStopReason) {
 // TODO(mknyszek): Replace traceBlockReason with waitReason. It's silly
 // that we have both, and waitReason is way more descriptive.
 func (tl traceLocker) GoPark(reason traceBlockReason, skip int) {
-	tl.eventWriter(tracev2.GoRunning, tracev2.ProcRunning).event(tracev2.EvGoBlock, traceArg(trace.goBlockReasons[tl.gen%2][reason]), tl.stack(skip))
+	tl.eventWriter(tracev2.GoRunning, tracev2.ProcRunning).event(tracev2.EvGoBlock, trace.goBlockReasons[tl.gen%2][reason], tl.stack(skip))
 }
 
 // GoUnpark emits a GoUnblock event.

src/runtime/tracestack.go

@@ -190,7 +190,7 @@ func dumpStacksRec(node *traceMapNode, w traceWriter, stackBuf []uintptr) traceW
 
 	// Emit stack event.
 	w.byte(byte(tracev2.EvStack))
-	w.varint(uint64(node.id))
+	w.varint(node.id)
 	w.varint(uint64(len(frames)))
 	for _, frame := range frames {
 		w.varint(uint64(frame.PC))

src/runtime/tracetype.go

@@ -64,7 +64,7 @@ func dumpTypesRec(node *traceMapNode, w traceWriter) traceWriter {
 	}
 
 	// Emit type.
-	w.varint(uint64(node.id))
+	w.varint(node.id)
 	w.varint(uint64(uintptr(unsafe.Pointer(typ))))
 	w.varint(uint64(typ.Size()))
 	w.varint(uint64(typ.PtrBytes))

src/sync/map_test.go

@@ -161,7 +161,7 @@ func TestConcurrentRange(t *testing.T) {
 
 	m := new(sync.Map)
 	for n := int64(1); n <= mapSize; n++ {
-		m.Store(n, int64(n))
+		m.Store(n, n)
 	}
 
 	done := make(chan struct{})

src/syscall/dirent.go

@@ -33,7 +33,7 @@ func readIntBE(b []byte, size uintptr) uint64 {
 	case 4:
 		return uint64(byteorder.BEUint32(b))
 	case 8:
-		return uint64(byteorder.BEUint64(b))
+		return byteorder.BEUint64(b)
 	default:
 		panic("syscall: readInt with unsupported size")
 	}
@@ -48,7 +48,7 @@ func readIntLE(b []byte, size uintptr) uint64 {
 	case 4:
 		return uint64(byteorder.LEUint32(b))
 	case 8:
-		return uint64(byteorder.LEUint64(b))
+		return byteorder.LEUint64(b)
 	default:
 		panic("syscall: readInt with unsupported size")
 	}

src/time/example_test.go

@@ -735,8 +735,8 @@ func ExampleTime_String() {
 	timeWithoutNanoseconds := time.Date(2000, 2, 1, 12, 13, 14, 0, time.UTC)
 	withoutNanoseconds := timeWithoutNanoseconds.String()
 
-	fmt.Printf("withNanoseconds = %v\n", string(withNanoseconds))
-	fmt.Printf("withoutNanoseconds = %v\n", string(withoutNanoseconds))
+	fmt.Printf("withNanoseconds = %v\n", withNanoseconds)
+	fmt.Printf("withoutNanoseconds = %v\n", withoutNanoseconds)
 
 	// Output:
 	// withNanoseconds = 2000-02-01 12:13:14.000000015 +0000 UTC

src/time/sleep.go

@@ -142,7 +142,7 @@ func (t *Timer) Stop() bool {
 // in Go 1.27 or later.
 func NewTimer(d Duration) *Timer {
 	c := make(chan Time, 1)
-	t := (*Timer)(newTimer(when(d), 0, sendTime, c, syncTimer(c)))
+	t := newTimer(when(d), 0, sendTime, c, syncTimer(c))
 	t.C = c
 	return t
 }
@@ -208,7 +208,7 @@ func After(d Duration) <-chan Time {
 // be used to cancel the call using its Stop method.
 // The returned Timer's C field is not used and will be nil.
 func AfterFunc(d Duration, f func()) *Timer {
-	return (*Timer)(newTimer(when(d), 0, goFunc, f, nil))
+	return newTimer(when(d), 0, goFunc, f, nil)
 }
 
 func goFunc(arg any, seq uintptr, delta int64) {