Use standard lib's atomicint in go1.19+

Makefile

@@ -4,14 +4,16 @@ export GOBIN ?= $(shell pwd)/bin
 GOLINT = $(GOBIN)/golint
 GEN_ATOMICINT = $(GOBIN)/gen-atomicint
 GEN_ATOMICWRAPPER = $(GOBIN)/gen-atomicwrapper
+GEN_ATOMICWRAPPER_GO119 = $(GOBIN)/gen-atomicwrapper-go119
 STATICCHECK = $(GOBIN)/staticcheck
 
 GO_FILES ?= $(shell find . '(' -path .git -o -path vendor ')' -prune -o -name '*.go' -print)
 
 # Also update ignore section in .codecov.yml.
 COVER_IGNORE_PKGS = \
 	go.uber.org/atomic/internal/gen-atomicint \
-	go.uber.org/atomic/internal/gen-atomicwrapper
+	go.uber.org/atomic/internal/gen-atomicwrapper \
+	go.uber.org/atomic/internal/gen-atomicwrapper-go119
 
 .PHONY: build
 build:
@@ -36,6 +38,9 @@ $(STATICCHECK):
 $(GEN_ATOMICWRAPPER): $(wildcard ./internal/gen-atomicwrapper/*)
 	go build -o $@ ./internal/gen-atomicwrapper
 
+$(GEN_ATOMICINT_GO119): $(wildcard ./internal/gen-atomicwrapper-go119/*)
+	go build -o $@ ./internal/gen-atomicwrapper-go119
+
 $(GEN_ATOMICINT): $(wildcard ./internal/gen-atomicint/*)
 	go build -o $@ ./internal/gen-atomicint
 
@@ -62,7 +67,7 @@ cover:
 	go tool cover -html=cover.out -o cover.html
 
 .PHONY: generate
-generate: $(GEN_ATOMICINT) $(GEN_ATOMICWRAPPER)
+generate: $(GEN_ATOMICINT) $(GEN_ATOMICINT_GO119) $(GEN_ATOMICWRAPPER)
 	go generate ./...
 
 .PHONY: generatenodirty

gen.go

@@ -25,3 +25,8 @@ package atomic
 //go:generate bin/gen-atomicint -name=Uint32 -wrapped=uint32 -unsigned -file=uint32.go
 //go:generate bin/gen-atomicint -name=Uint64 -wrapped=uint64 -unsigned -file=uint64.go
 //go:generate bin/gen-atomicint -name=Uintptr -wrapped=uintptr -unsigned -file=uintptr.go
+//go:generate bin/gen-atomicint-go119 -name=Int32 -wrapped=int32 -file=int32_go119.go
+//go:generate bin/gen-atomicint-go119 -name=Int64 -wrapped=int64 -file=int64_go119.go
+//go:generate bin/gen-atomicint-go119 -name=Uint32 -wrapped=uint32 -unsigned -file=uint32_go119.go
+//go:generate bin/gen-atomicint-go119 -name=Uint64 -wrapped=uint64 -unsigned -file=uint64_go119.go
+//go:generate bin/gen-atomicint-go119 -name=Uintptr -wrapped=uintptr -unsigned -file=uintptr_go119.go

int32.go

@@ -1,6 +1,6 @@
 // @generated Code generated by gen-atomicint.
 
-// Copyright (c) 2020-2022 Uber Technologies, Inc.
+// Copyright (c) 2020-2023 Uber Technologies, Inc.
 //
 // Permission is hereby granted, free of charge, to any person obtaining a copy
 // of this software and associated documentation files (the "Software"), to deal
@@ -20,6 +20,8 @@
 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 // THE SOFTWARE.
 
+//go:build !go1.19
+
 package atomic
 
 import (

int32_go119.go

@@ -0,0 +1,113 @@
+// @generated Code generated by gen-atomicint.
+
+// Copyright (c) 2020-2023 Uber Technologies, Inc.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+//go:build go1.19
+
+package atomic
+
+import (
+	"encoding/json"
+	"strconv"
+	"sync/atomic"
+)
+
+// Int32 is an atomic wrapper around int32.
+type Int32 struct {
+	_ nocmp // disallow non-atomic comparison
+
+	v atomic.Int32
+}
+
+// NewInt32 creates a new Int32.
+func NewInt32(val int32) *Int32 {
+	i := &Int32{}
+	i.Store(val)
+	return i
+}
+
+// Load atomically loads the wrapped value.
+func (i *Int32) Load() int32 {
+	return i.v.Load()
+}
+
+// Add atomically adds to the wrapped int32 and returns the new value.
+func (i *Int32) Add(delta int32) int32 {
+	return i.v.Add(delta)
+}
+
+// Sub atomically subtracts from the wrapped int32 and returns the new value.
+func (i *Int32) Sub(delta int32) int32 {
+	return i.v.Add(-delta)
+}
+
+// Inc atomically increments the wrapped int32 and returns the new value.
+func (i *Int32) Inc() int32 {
+	return i.Add(1)
+}
+
+// Dec atomically decrements the wrapped int32 and returns the new value.
+func (i *Int32) Dec() int32 {
+	return i.Sub(1)
+}
+
+// CAS is an atomic compare-and-swap.
+//
+// Deprecated: Use CompareAndSwap.
+func (i *Int32) CAS(old, new int32) (swapped bool) {
+	return i.CompareAndSwap(old, new)
+}
+
+// CompareAndSwap is an atomic compare-and-swap.
+func (i *Int32) CompareAndSwap(old, new int32) (swapped bool) {
+	return i.v.CompareAndSwap(old, new)
+}
+
+// Store atomically stores the passed value.
+func (i *Int32) Store(val int32) {
+	i.v.Store(val)
+}
+
+// Swap atomically swaps the wrapped int32 and returns the old value.
+func (i *Int32) Swap(val int32) (old int32) {
+	return i.v.Swap(val)
+}
+
+// MarshalJSON encodes the wrapped int32 into JSON.
+func (i *Int32) MarshalJSON() ([]byte, error) {
+	return json.Marshal(i.Load())
+}
+
+// UnmarshalJSON decodes JSON into the wrapped int32.
+func (i *Int32) UnmarshalJSON(b []byte) error {
+	var v int32
+	if err := json.Unmarshal(b, &v); err != nil {
+		return err
+	}
+	i.Store(v)
+	return nil
+}
+
+// String encodes the wrapped value as a string.
+func (i *Int32) String() string {
+	v := i.Load()
+	return strconv.FormatInt(int64(v), 10)
+}

int64.go

@@ -1,6 +1,6 @@
 // @generated Code generated by gen-atomicint.
 
-// Copyright (c) 2020-2022 Uber Technologies, Inc.
+// Copyright (c) 2020-2023 Uber Technologies, Inc.
 //
 // Permission is hereby granted, free of charge, to any person obtaining a copy
 // of this software and associated documentation files (the "Software"), to deal
@@ -20,6 +20,8 @@
 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 // THE SOFTWARE.
 
+//go:build !go1.19
+
 package atomic
 
 import (

int64_go119.go

@@ -0,0 +1,113 @@
+// @generated Code generated by gen-atomicint.
+
+// Copyright (c) 2020-2023 Uber Technologies, Inc.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+//go:build go1.19
+
+package atomic
+
+import (
+	"encoding/json"
+	"strconv"
+	"sync/atomic"
+)
+
+// Int64 is an atomic wrapper around int64.
+type Int64 struct {
+	_ nocmp // disallow non-atomic comparison
+
+	v atomic.Int64
+}
+
+// NewInt64 creates a new Int64.
+func NewInt64(val int64) *Int64 {
+	i := &Int64{}
+	i.Store(val)
+	return i
+}
+
+// Load atomically loads the wrapped value.
+func (i *Int64) Load() int64 {
+	return i.v.Load()
+}
+
+// Add atomically adds to the wrapped int64 and returns the new value.
+func (i *Int64) Add(delta int64) int64 {
+	return i.v.Add(delta)
+}
+
+// Sub atomically subtracts from the wrapped int64 and returns the new value.
+func (i *Int64) Sub(delta int64) int64 {
+	return i.v.Add(-delta)
+}
+
+// Inc atomically increments the wrapped int64 and returns the new value.
+func (i *Int64) Inc() int64 {
+	return i.Add(1)
+}
+
+// Dec atomically decrements the wrapped int64 and returns the new value.
+func (i *Int64) Dec() int64 {
+	return i.Sub(1)
+}
+
+// CAS is an atomic compare-and-swap.
+//
+// Deprecated: Use CompareAndSwap.
+func (i *Int64) CAS(old, new int64) (swapped bool) {
+	return i.CompareAndSwap(old, new)
+}
+
+// CompareAndSwap is an atomic compare-and-swap.
+func (i *Int64) CompareAndSwap(old, new int64) (swapped bool) {
+	return i.v.CompareAndSwap(old, new)
+}
+
+// Store atomically stores the passed value.
+func (i *Int64) Store(val int64) {
+	i.v.Store(val)
+}
+
+// Swap atomically swaps the wrapped int64 and returns the old value.
+func (i *Int64) Swap(val int64) (old int64) {
+	return i.v.Swap(val)
+}
+
+// MarshalJSON encodes the wrapped int64 into JSON.
+func (i *Int64) MarshalJSON() ([]byte, error) {
+	return json.Marshal(i.Load())
+}
+
+// UnmarshalJSON decodes JSON into the wrapped int64.
+func (i *Int64) UnmarshalJSON(b []byte) error {
+	var v int64
+	if err := json.Unmarshal(b, &v); err != nil {
+		return err
+	}
+	i.Store(v)
+	return nil
+}
+
+// String encodes the wrapped value as a string.
+func (i *Int64) String() string {
+	v := i.Load()
+	return strconv.FormatInt(int64(v), 10)
+}