Update structured-merge-diff to latest version

go.mod

@@ -473,7 +473,7 @@ replace (
 	modernc.org/strutil => modernc.org/strutil v1.0.0
 	modernc.org/xc => modernc.org/xc v1.0.0
 	sigs.k8s.io/kustomize => sigs.k8s.io/kustomize v2.0.3+incompatible
-	sigs.k8s.io/structured-merge-diff => sigs.k8s.io/structured-merge-diff v0.0.0-20190724202554-0c1d754dd648
+	sigs.k8s.io/structured-merge-diff => sigs.k8s.io/structured-merge-diff v0.0.0-20190817042607-6149e4549fca
 	sigs.k8s.io/yaml => sigs.k8s.io/yaml v1.1.0
 	vbom.ml/util => vbom.ml/util v0.0.0-20160121211510-db5cfe13f5cc
 )

go.sum

@@ -505,8 +505,8 @@ modernc.org/strutil v1.0.0/go.mod h1:lstksw84oURvj9y3tn8lGvRxyRC1S2+g5uuIzNfIOBs
 modernc.org/xc v1.0.0/go.mod h1:mRNCo0bvLjGhHO9WsyuKVU4q0ceiDDDoEeWDJHrNx8I=
 sigs.k8s.io/kustomize v2.0.3+incompatible h1:JUufWFNlI44MdtnjUqVnvh29rR37PQFzPbLXqhyOyX0=
 sigs.k8s.io/kustomize v2.0.3+incompatible/go.mod h1:MkjgH3RdOWrievjo6c9T245dYlB5QeXV4WCbnt/PEpU=
-sigs.k8s.io/structured-merge-diff v0.0.0-20190724202554-0c1d754dd648 h1:qukMPS/1fDG5pToYLYSEx5IpwHVJMtTyOMaIIsR2Fas=
-sigs.k8s.io/structured-merge-diff v0.0.0-20190724202554-0c1d754dd648/go.mod h1:IIgPezJWb76P0hotTxzDbWsMYB8APh18qZnxkomBpxA=
+sigs.k8s.io/structured-merge-diff v0.0.0-20190817042607-6149e4549fca h1:6dsH6AYQWbyZmtttJNe8Gq1cXOeS1BdV3eW37zHilAQ=
+sigs.k8s.io/structured-merge-diff v0.0.0-20190817042607-6149e4549fca/go.mod h1:IIgPezJWb76P0hotTxzDbWsMYB8APh18qZnxkomBpxA=
 sigs.k8s.io/yaml v1.1.0 h1:4A07+ZFc2wgJwo8YNlQpr1rVlgUDlxXHhPJciaPY5gs=
 sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=
 vbom.ml/util v0.0.0-20160121211510-db5cfe13f5cc h1:MksmcCZQWAQJCTA5T0jgI/0sJ51AVm4Z41MrmfczEoc=

staging/src/k8s.io/apiextensions-apiserver/go.sum

@@ -335,7 +335,7 @@ modernc.org/strutil v1.0.0/go.mod h1:lstksw84oURvj9y3tn8lGvRxyRC1S2+g5uuIzNfIOBs
 modernc.org/xc v1.0.0/go.mod h1:mRNCo0bvLjGhHO9WsyuKVU4q0ceiDDDoEeWDJHrNx8I=
 sigs.k8s.io/structured-merge-diff v0.0.0-20190525122527-15d366b2352e h1:4Z09Hglb792X0kfOBBJUPFEyvVfQWrYT/l8h5EKA6JQ=
 sigs.k8s.io/structured-merge-diff v0.0.0-20190525122527-15d366b2352e/go.mod h1:wWxsB5ozmmv/SG7nM11ayaAW51xMvak/t1r0CSlcokI=
-sigs.k8s.io/structured-merge-diff v0.0.0-20190724202554-0c1d754dd648 h1:qukMPS/1fDG5pToYLYSEx5IpwHVJMtTyOMaIIsR2Fas=
-sigs.k8s.io/structured-merge-diff v0.0.0-20190724202554-0c1d754dd648/go.mod h1:IIgPezJWb76P0hotTxzDbWsMYB8APh18qZnxkomBpxA=
+sigs.k8s.io/structured-merge-diff v0.0.0-20190817042607-6149e4549fca h1:6dsH6AYQWbyZmtttJNe8Gq1cXOeS1BdV3eW37zHilAQ=
+sigs.k8s.io/structured-merge-diff v0.0.0-20190817042607-6149e4549fca/go.mod h1:IIgPezJWb76P0hotTxzDbWsMYB8APh18qZnxkomBpxA=
 sigs.k8s.io/yaml v1.1.0 h1:4A07+ZFc2wgJwo8YNlQpr1rVlgUDlxXHhPJciaPY5gs=
 sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=

staging/src/k8s.io/apiserver/go.mod

@@ -59,7 +59,7 @@ require (
 	k8s.io/klog v0.4.0
 	k8s.io/kube-openapi v0.0.0-20190709113604-33be087ad058
 	k8s.io/utils v0.0.0-20190801114015-581e00157fb1
-	sigs.k8s.io/structured-merge-diff v0.0.0-20190724202554-0c1d754dd648
+	sigs.k8s.io/structured-merge-diff v0.0.0-20190817042607-6149e4549fca
 	sigs.k8s.io/yaml v1.1.0
 )
 

staging/src/k8s.io/apiserver/go.sum

@@ -250,7 +250,7 @@ k8s.io/utils v0.0.0-20190801114015-581e00157fb1 h1:+ySTxfHnfzZb9ys375PXNlLhkJPLK
 k8s.io/utils v0.0.0-20190801114015-581e00157fb1/go.mod h1:sZAwmy6armz5eXlNoLmJcl4F1QuKu7sr+mFQ0byX7Ew=
 sigs.k8s.io/structured-merge-diff v0.0.0-20190525122527-15d366b2352e h1:4Z09Hglb792X0kfOBBJUPFEyvVfQWrYT/l8h5EKA6JQ=
 sigs.k8s.io/structured-merge-diff v0.0.0-20190525122527-15d366b2352e/go.mod h1:wWxsB5ozmmv/SG7nM11ayaAW51xMvak/t1r0CSlcokI=
-sigs.k8s.io/structured-merge-diff v0.0.0-20190724202554-0c1d754dd648 h1:qukMPS/1fDG5pToYLYSEx5IpwHVJMtTyOMaIIsR2Fas=
-sigs.k8s.io/structured-merge-diff v0.0.0-20190724202554-0c1d754dd648/go.mod h1:IIgPezJWb76P0hotTxzDbWsMYB8APh18qZnxkomBpxA=
+sigs.k8s.io/structured-merge-diff v0.0.0-20190817042607-6149e4549fca h1:6dsH6AYQWbyZmtttJNe8Gq1cXOeS1BdV3eW37zHilAQ=
+sigs.k8s.io/structured-merge-diff v0.0.0-20190817042607-6149e4549fca/go.mod h1:IIgPezJWb76P0hotTxzDbWsMYB8APh18qZnxkomBpxA=
 sigs.k8s.io/yaml v1.1.0 h1:4A07+ZFc2wgJwo8YNlQpr1rVlgUDlxXHhPJciaPY5gs=
 sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=

staging/src/k8s.io/kube-aggregator/go.sum

@@ -289,7 +289,7 @@ modernc.org/strutil v1.0.0/go.mod h1:lstksw84oURvj9y3tn8lGvRxyRC1S2+g5uuIzNfIOBs
 modernc.org/xc v1.0.0/go.mod h1:mRNCo0bvLjGhHO9WsyuKVU4q0ceiDDDoEeWDJHrNx8I=
 sigs.k8s.io/structured-merge-diff v0.0.0-20190525122527-15d366b2352e h1:4Z09Hglb792X0kfOBBJUPFEyvVfQWrYT/l8h5EKA6JQ=
 sigs.k8s.io/structured-merge-diff v0.0.0-20190525122527-15d366b2352e/go.mod h1:wWxsB5ozmmv/SG7nM11ayaAW51xMvak/t1r0CSlcokI=
-sigs.k8s.io/structured-merge-diff v0.0.0-20190724202554-0c1d754dd648 h1:qukMPS/1fDG5pToYLYSEx5IpwHVJMtTyOMaIIsR2Fas=
-sigs.k8s.io/structured-merge-diff v0.0.0-20190724202554-0c1d754dd648/go.mod h1:IIgPezJWb76P0hotTxzDbWsMYB8APh18qZnxkomBpxA=
+sigs.k8s.io/structured-merge-diff v0.0.0-20190817042607-6149e4549fca h1:6dsH6AYQWbyZmtttJNe8Gq1cXOeS1BdV3eW37zHilAQ=
+sigs.k8s.io/structured-merge-diff v0.0.0-20190817042607-6149e4549fca/go.mod h1:IIgPezJWb76P0hotTxzDbWsMYB8APh18qZnxkomBpxA=
 sigs.k8s.io/yaml v1.1.0 h1:4A07+ZFc2wgJwo8YNlQpr1rVlgUDlxXHhPJciaPY5gs=
 sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=

staging/src/k8s.io/legacy-cloud-providers/go.sum

@@ -235,6 +235,6 @@ k8s.io/kube-openapi v0.0.0-20190709113604-33be087ad058/go.mod h1:nfDlWeOsu3pUf4y
 k8s.io/utils v0.0.0-20190801114015-581e00157fb1 h1:+ySTxfHnfzZb9ys375PXNlLhkJPLKgHajBU0N62BDvE=
 k8s.io/utils v0.0.0-20190801114015-581e00157fb1/go.mod h1:sZAwmy6armz5eXlNoLmJcl4F1QuKu7sr+mFQ0byX7Ew=
 sigs.k8s.io/structured-merge-diff v0.0.0-20190525122527-15d366b2352e/go.mod h1:wWxsB5ozmmv/SG7nM11ayaAW51xMvak/t1r0CSlcokI=
-sigs.k8s.io/structured-merge-diff v0.0.0-20190724202554-0c1d754dd648/go.mod h1:IIgPezJWb76P0hotTxzDbWsMYB8APh18qZnxkomBpxA=
+sigs.k8s.io/structured-merge-diff v0.0.0-20190817042607-6149e4549fca/go.mod h1:IIgPezJWb76P0hotTxzDbWsMYB8APh18qZnxkomBpxA=
 sigs.k8s.io/yaml v1.1.0 h1:4A07+ZFc2wgJwo8YNlQpr1rVlgUDlxXHhPJciaPY5gs=
 sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=

staging/src/k8s.io/sample-apiserver/go.sum

@@ -286,7 +286,7 @@ modernc.org/strutil v1.0.0/go.mod h1:lstksw84oURvj9y3tn8lGvRxyRC1S2+g5uuIzNfIOBs
 modernc.org/xc v1.0.0/go.mod h1:mRNCo0bvLjGhHO9WsyuKVU4q0ceiDDDoEeWDJHrNx8I=
 sigs.k8s.io/structured-merge-diff v0.0.0-20190525122527-15d366b2352e h1:4Z09Hglb792X0kfOBBJUPFEyvVfQWrYT/l8h5EKA6JQ=
 sigs.k8s.io/structured-merge-diff v0.0.0-20190525122527-15d366b2352e/go.mod h1:wWxsB5ozmmv/SG7nM11ayaAW51xMvak/t1r0CSlcokI=
-sigs.k8s.io/structured-merge-diff v0.0.0-20190724202554-0c1d754dd648 h1:qukMPS/1fDG5pToYLYSEx5IpwHVJMtTyOMaIIsR2Fas=
-sigs.k8s.io/structured-merge-diff v0.0.0-20190724202554-0c1d754dd648/go.mod h1:IIgPezJWb76P0hotTxzDbWsMYB8APh18qZnxkomBpxA=
+sigs.k8s.io/structured-merge-diff v0.0.0-20190817042607-6149e4549fca h1:6dsH6AYQWbyZmtttJNe8Gq1cXOeS1BdV3eW37zHilAQ=
+sigs.k8s.io/structured-merge-diff v0.0.0-20190817042607-6149e4549fca/go.mod h1:IIgPezJWb76P0hotTxzDbWsMYB8APh18qZnxkomBpxA=
 sigs.k8s.io/yaml v1.1.0 h1:4A07+ZFc2wgJwo8YNlQpr1rVlgUDlxXHhPJciaPY5gs=
 sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=

vendor/modules.txt

@@ -1834,7 +1834,7 @@ sigs.k8s.io/kustomize/pkg/transformers
 sigs.k8s.io/kustomize/pkg/transformers/config
 sigs.k8s.io/kustomize/pkg/transformers/config/defaultconfig
 sigs.k8s.io/kustomize/pkg/types
-# sigs.k8s.io/structured-merge-diff v0.0.0-20190724202554-0c1d754dd648 => sigs.k8s.io/structured-merge-diff v0.0.0-20190724202554-0c1d754dd648
+# sigs.k8s.io/structured-merge-diff v0.0.0-20190817042607-6149e4549fca => sigs.k8s.io/structured-merge-diff v0.0.0-20190817042607-6149e4549fca
 sigs.k8s.io/structured-merge-diff/fieldpath
 sigs.k8s.io/structured-merge-diff/merge
 sigs.k8s.io/structured-merge-diff/schema

vendor/sigs.k8s.io/structured-merge-diff/merge/update.go

@@ -31,6 +31,14 @@ type Converter interface {
 // merge the object on Apply.
 type Updater struct {
 	Converter Converter
+
+	enableUnions bool
+}
+
+// EnableUnionFeature turns on union handling. It is disabled by default until the
+// feature is complete.
+func (s *Updater) EnableUnionFeature() {
+	s.enableUnions = true
 }
 
 func (s *Updater) update(oldObject, newObject *typed.TypedValue, version fieldpath.APIVersion, managers fieldpath.ManagedFields, workflow string, force bool) (fieldpath.ManagedFields, error) {
@@ -112,9 +120,12 @@ func (s *Updater) update(oldObject, newObject *typed.TypedValue, version fieldpa
 // PATCH call), and liveObject must be the original object (empty if
 // this is a CREATE call).
 func (s *Updater) Update(liveObject, newObject *typed.TypedValue, version fieldpath.APIVersion, managers fieldpath.ManagedFields, manager string) (*typed.TypedValue, fieldpath.ManagedFields, error) {
-	newObject, err := liveObject.NormalizeUnions(newObject)
-	if err != nil {
-		return nil, fieldpath.ManagedFields{}, err
+	var err error
+	if s.enableUnions {
+		newObject, err = liveObject.NormalizeUnions(newObject)
+		if err != nil {
+			return nil, fieldpath.ManagedFields{}, err
+		}
 	}
 	managers = shallowCopyManagers(managers)
 	managers, err = s.update(liveObject, newObject, version, managers, manager, true)
@@ -144,17 +155,22 @@ func (s *Updater) Update(liveObject, newObject *typed.TypedValue, version fieldp
 // and return it.
 func (s *Updater) Apply(liveObject, configObject *typed.TypedValue, version fieldpath.APIVersion, managers fieldpath.ManagedFields, manager string, force bool) (*typed.TypedValue, fieldpath.ManagedFields, error) {
 	managers = shallowCopyManagers(managers)
-	configObject, err := configObject.NormalizeUnionsApply(configObject)
-	if err != nil {
-		return nil, fieldpath.ManagedFields{}, err
+	var err error
+	if s.enableUnions {
+		configObject, err = configObject.NormalizeUnionsApply(configObject)
+		if err != nil {
+			return nil, fieldpath.ManagedFields{}, err
+		}
 	}
 	newObject, err := liveObject.Merge(configObject)
 	if err != nil {
 		return nil, fieldpath.ManagedFields{}, fmt.Errorf("failed to merge config: %v", err)
 	}
-	newObject, err = configObject.NormalizeUnionsApply(newObject)
-	if err != nil {
-		return nil, fieldpath.ManagedFields{}, err
+	if s.enableUnions {
+		newObject, err = configObject.NormalizeUnionsApply(newObject)
+		if err != nil {
+			return nil, fieldpath.ManagedFields{}, err
+		}
 	}
 	lastSet := managers[manager]
 	set, err := configObject.ToFieldSet()

vendor/sigs.k8s.io/structured-merge-diff/schema/BUILD

@@ -5,6 +5,7 @@ go_library(
     srcs = [
         "doc.go",
         "elements.go",
+        "equals.go",
         "schemaschema.go",
     ],
     importmap = "k8s.io/kubernetes/vendor/sigs.k8s.io/structured-merge-diff/schema",

vendor/sigs.k8s.io/structured-merge-diff/schema/equals.go

@@ -0,0 +1,166 @@
+/*
+Copyright 2019 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package schema
+
+// Equals returns true iff the two Schemas are equal.
+func (a Schema) Equals(b Schema) bool {
+	if len(a.Types) != len(b.Types) {
+		return false
+	}
+	for i := range a.Types {
+		if !a.Types[i].Equals(b.Types[i]) {
+			return false
+		}
+	}
+	return true
+}
+
+// Equals returns true iff the two TypeRefs are equal.
+//
+// Note that two typerefs that have an equivalent type but where one is
+// inlined and the other is named, are not considered equal.
+func (a TypeRef) Equals(b TypeRef) bool {
+	if (a.NamedType == nil) != (b.NamedType == nil) {
+		return false
+	}
+	if a.NamedType != nil {
+		if *a.NamedType != *b.NamedType {
+			return false
+		}
+		//return true
+	}
+	return a.Inlined.Equals(b.Inlined)
+}
+
+// Equals returns true iff the two TypeDefs are equal.
+func (a TypeDef) Equals(b TypeDef) bool {
+	if a.Name != b.Name {
+		return false
+	}
+	return a.Atom.Equals(b.Atom)
+}
+
+// Equals returns true iff the two Atoms are equal.
+func (a Atom) Equals(b Atom) bool {
+	if (a.Scalar == nil) != (b.Scalar == nil) {
+		return false
+	}
+	if (a.List == nil) != (b.List == nil) {
+		return false
+	}
+	if (a.Map == nil) != (b.Map == nil) {
+		return false
+	}
+	switch {
+	case a.Scalar != nil:
+		return *a.Scalar == *b.Scalar
+	case a.List != nil:
+		return a.List.Equals(*b.List)
+	case a.Map != nil:
+		return a.Map.Equals(*b.Map)
+	}
+	return true
+}
+
+// Equals returns true iff the two Maps are equal.
+func (a Map) Equals(b Map) bool {
+	if !a.ElementType.Equals(b.ElementType) {
+		return false
+	}
+	if a.ElementRelationship != b.ElementRelationship {
+		return false
+	}
+	if len(a.Fields) != len(b.Fields) {
+		return false
+	}
+	for i := range a.Fields {
+		if !a.Fields[i].Equals(b.Fields[i]) {
+			return false
+		}
+	}
+	if len(a.Unions) != len(b.Unions) {
+		return false
+	}
+	for i := range a.Unions {
+		if !a.Unions[i].Equals(b.Unions[i]) {
+			return false
+		}
+	}
+	return true
+}
+
+// Equals returns true iff the two Unions are equal.
+func (a Union) Equals(b Union) bool {
+	if (a.Discriminator == nil) != (b.Discriminator == nil) {
+		return false
+	}
+	if a.Discriminator != nil {
+		if *a.Discriminator != *b.Discriminator {
+			return false
+		}
+	}
+	if a.DeduceInvalidDiscriminator != b.DeduceInvalidDiscriminator {
+		return false
+	}
+	if len(a.Fields) != len(b.Fields) {
+		return false
+	}
+	for i := range a.Fields {
+		if !a.Fields[i].Equals(b.Fields[i]) {
+			return false
+		}
+	}
+	return true
+}
+
+// Equals returns true iff the two UnionFields are equal.
+func (a UnionField) Equals(b UnionField) bool {
+	if a.FieldName != b.FieldName {
+		return false
+	}
+	if a.DiscriminatorValue != b.DiscriminatorValue {
+		return false
+	}
+	return true
+}
+
+// Equals returns true iff the two StructFields are equal.
+func (a StructField) Equals(b StructField) bool {
+	if a.Name != b.Name {
+		return false
+	}
+	return a.Type.Equals(b.Type)
+}
+
+// Equals returns true iff the two Lists are equal.
+func (a List) Equals(b List) bool {
+	if !a.ElementType.Equals(b.ElementType) {
+		return false
+	}
+	if a.ElementRelationship != b.ElementRelationship {
+		return false
+	}
+	if len(a.Keys) != len(b.Keys) {
+		return false
+	}
+	for i := range a.Keys {
+		if a.Keys[i] != b.Keys[i] {
+			return false
+		}
+	}
+	return true
+}

vendor/sigs.k8s.io/structured-merge-diff/typed/helpers.go

@@ -67,6 +67,14 @@ func (ef *errorFormatter) descend(pe fieldpath.PathElement) {
 	ef.path = append(ef.path, pe)
 }
 
+// parent returns the parent, for the purpose of buffer reuse. It's an error to
+// call this if there is no parent.
+func (ef *errorFormatter) parent() errorFormatter {
+	return errorFormatter{
+		path: ef.path[:len(ef.path)-1],
+	}
+}
+
 func (ef errorFormatter) errorf(format string, args ...interface{}) ValidationErrors {
 	return ValidationErrors{{
 		Path:         append(fieldpath.Path{}, ef.path...),

vendor/sigs.k8s.io/structured-merge-diff/typed/merge.go

@@ -17,8 +17,6 @@ limitations under the License.
 package typed
 
 import (
-	"reflect"
-
 	"sigs.k8s.io/structured-merge-diff/fieldpath"
 	"sigs.k8s.io/structured-merge-diff/schema"
 	"sigs.k8s.io/structured-merge-diff/value"
@@ -43,6 +41,9 @@ type mergingWalker struct {
 
 	// internal housekeeping--don't set when constructing.
 	inLeaf bool // Set to true if we're in a "big leaf"--atomic map/list
+
+	// Allocate only as many walkers as needed for the depth by storing them here.
+	spareWalkers *[]*mergingWalker
 }
 
 // merge rules examine w.lhs and w.rhs (up to one of which may be nil) and
@@ -75,7 +76,7 @@ func (w *mergingWalker) merge() (errs ValidationErrors) {
 
 	alhs := deduceAtom(a, w.lhs)
 	arhs := deduceAtom(a, w.rhs)
-	if reflect.DeepEqual(alhs, arhs) {
+	if alhs.Equals(arhs) {
 		errs = append(errs, handleAtom(arhs, w.typeRef, w)...)
 	} else {
 		w2 := *w
@@ -117,13 +118,30 @@ func (w *mergingWalker) doScalar(t schema.Scalar) (errs ValidationErrors) {
 }
 
 func (w *mergingWalker) prepareDescent(pe fieldpath.PathElement, tr schema.TypeRef) *mergingWalker {
-	w2 := *w
+	if w.spareWalkers == nil {
+		// first descent.
+		w.spareWalkers = &[]*mergingWalker{}
+	}
+	var w2 *mergingWalker
+	if n := len(*w.spareWalkers); n > 0 {
+		w2, *w.spareWalkers = (*w.spareWalkers)[n-1], (*w.spareWalkers)[:n-1]
+	} else {
+		w2 = &mergingWalker{}
+	}
+	*w2 = *w
 	w2.typeRef = tr
 	w2.errorFormatter.descend(pe)
 	w2.lhs = nil
 	w2.rhs = nil
 	w2.out = nil
-	return &w2
+	return w2
+}
+
+func (w *mergingWalker) finishDescent(w2 *mergingWalker) {
+	// if the descent caused a realloc, ensure that we reuse the buffer
+	// for the next sibling.
+	w.errorFormatter = w2.errorFormatter.parent()
+	*w.spareWalkers = append(*w.spareWalkers, w2)
 }
 
 func (w *mergingWalker) derefMap(prefix string, v *value.Value, dest **value.Map) (errs ValidationErrors) {
@@ -198,6 +216,7 @@ func (w *mergingWalker) visitListItems(t schema.List, lhs, rhs *value.List) (err
 			} else if w2.out != nil {
 				out.Items = append(out.Items, *w2.out)
 			}
+			w.finishDescent(w2)
 			// Keep track of children that have been handled
 			delete(observedRHS, keyStr)
 		}
@@ -212,6 +231,7 @@ func (w *mergingWalker) visitListItems(t schema.List, lhs, rhs *value.List) (err
 			} else if w2.out != nil {
 				out.Items = append(out.Items, *w2.out)
 			}
+			w.finishDescent(w2)
 		}
 	}
 
@@ -272,13 +292,13 @@ func (w *mergingWalker) visitMapItems(t schema.Map, lhs, rhs *value.Map) (errs V
 	}
 
 	if lhs != nil {
-		for _, litem := range lhs.Items {
-			name := litem.Name
+		for i := range lhs.Items {
+			litem := &lhs.Items[i]
 			fieldType := t.ElementType
-			if ft, ok := fieldTypes[name]; ok {
+			if ft, ok := fieldTypes[litem.Name]; ok {
 				fieldType = ft
 			}
-			w2 := w.prepareDescent(fieldpath.PathElement{FieldName: &name}, fieldType)
+			w2 := w.prepareDescent(fieldpath.PathElement{FieldName: &litem.Name}, fieldType)
 			w2.lhs = &litem.Value
 			if rhs != nil {
 				if ritem, ok := rhs.Get(litem.Name); ok {
@@ -288,31 +308,33 @@ func (w *mergingWalker) visitMapItems(t schema.Map, lhs, rhs *value.Map) (errs V
 			if newErrs := w2.merge(); len(newErrs) > 0 {
 				errs = append(errs, newErrs...)
 			} else if w2.out != nil {
-				out.Set(name, *w2.out)
+				out.Items = append(out.Items, value.Field{litem.Name, *w2.out})
 			}
+			w.finishDescent(w2)
 		}
 	}
 
 	if rhs != nil {
-		for _, ritem := range rhs.Items {
+		for j := range rhs.Items {
+			ritem := &rhs.Items[j]
 			if lhs != nil {
 				if _, ok := lhs.Get(ritem.Name); ok {
 					continue
 				}
 			}
 
-			name := ritem.Name
 			fieldType := t.ElementType
-			if ft, ok := fieldTypes[name]; ok {
+			if ft, ok := fieldTypes[ritem.Name]; ok {
 				fieldType = ft
 			}
-			w2 := w.prepareDescent(fieldpath.PathElement{FieldName: &name}, fieldType)
+			w2 := w.prepareDescent(fieldpath.PathElement{FieldName: &ritem.Name}, fieldType)
 			w2.rhs = &ritem.Value
 			if newErrs := w2.merge(); len(newErrs) > 0 {
 				errs = append(errs, newErrs...)
 			} else if w2.out != nil {
-				out.Set(name, *w2.out)
+				out.Items = append(out.Items, value.Field{ritem.Name, *w2.out})
 			}
+			w.finishDescent(w2)
 		}
 	}
 

vendor/sigs.k8s.io/structured-merge-diff/typed/typed.go

@@ -18,7 +18,7 @@ package typed
 
 import (
 	"fmt"
-	"reflect"
+	"sync"
 
 	"sigs.k8s.io/structured-merge-diff/fieldpath"
 	"sigs.k8s.io/structured-merge-diff/schema"
@@ -67,7 +67,9 @@ func (tv TypedValue) AsValue() *value.Value {
 
 // Validate returns an error with a list of every spec violation.
 func (tv TypedValue) Validate() error {
-	if errs := tv.walker().validate(); len(errs) != 0 {
+	w := tv.walker()
+	defer w.finished()
+	if errs := w.validate(); len(errs) != 0 {
 		return errs
 	}
 	return nil
@@ -78,6 +80,7 @@ func (tv TypedValue) Validate() error {
 func (tv TypedValue) ToFieldSet() (*fieldpath.Set, error) {
 	s := fieldpath.NewSet()
 	w := tv.walker()
+	defer w.finished()
 	w.leafFieldCallback = func(p fieldpath.Path) { s.Insert(p) }
 	w.nodeFieldCallback = func(p fieldpath.Path) { s.Insert(p) }
 	if errs := w.validate(); len(errs) != 0 {
@@ -118,8 +121,8 @@ func (tv TypedValue) Compare(rhs *TypedValue) (c *Comparison, err error) {
 			c.Added.Insert(w.path)
 		} else if w.rhs == nil {
 			c.Removed.Insert(w.path)
-		} else if !reflect.DeepEqual(w.rhs, w.lhs) {
-			// TODO: reflect.DeepEqual is not sufficient for this.
+		} else if !w.rhs.Equals(*w.lhs) {
+			// TODO: Equality is not sufficient for this.
 			// Need to implement equality check on the value type.
 			c.Modified.Insert(w.path)
 		}
@@ -154,6 +157,8 @@ func (tv TypedValue) RemoveItems(items *fieldpath.Set) *TypedValue {
 // - If discriminator changed to non-nil, all other fields but the
 // discriminated one will be cleared,
 // - Otherwise, If only one field is left, update discriminator to that value.
+//
+// Please note: union behavior isn't finalized yet and this is still experimental.
 func (tv TypedValue) NormalizeUnions(new *TypedValue) (*TypedValue, error) {
 	var errs ValidationErrors
 	var normalizeFn = func(w *mergingWalker) {
@@ -178,6 +183,8 @@ func (tv TypedValue) NormalizeUnions(new *TypedValue) (*TypedValue, error) {
 // NormalizeUnionsApply specifically normalize unions on apply. It
 // validates that the applied union is correct (there should be no
 // ambiguity there), and clear the fields according to the sent intent.
+//
+// Please note: union behavior isn't finalized yet and this is still experimental.
 func (tv TypedValue) NormalizeUnionsApply(new *TypedValue) (*TypedValue, error) {
 	var errs ValidationErrors
 	var normalizeFn = func(w *mergingWalker) {
@@ -204,24 +211,41 @@ func (tv TypedValue) Empty() *TypedValue {
 	return &tv
 }
 
+var mwPool = sync.Pool{
+	New: func() interface{} { return &mergingWalker{} },
+}
+
 func merge(lhs, rhs *TypedValue, rule, postRule mergeRule) (*TypedValue, error) {
 	if lhs.schema != rhs.schema {
 		return nil, errorFormatter{}.
 			errorf("expected objects with types from the same schema")
 	}
-	if !reflect.DeepEqual(lhs.typeRef, rhs.typeRef) {
+	if !lhs.typeRef.Equals(rhs.typeRef) {
 		return nil, errorFormatter{}.
 			errorf("expected objects of the same type, but got %v and %v", lhs.typeRef, rhs.typeRef)
 	}
 
-	mw := mergingWalker{
-		lhs:          &lhs.value,
-		rhs:          &rhs.value,
-		schema:       lhs.schema,
-		typeRef:      lhs.typeRef,
-		rule:         rule,
-		postItemHook: postRule,
-	}
+	mw := mwPool.Get().(*mergingWalker)
+	defer func() {
+		mw.lhs = nil
+		mw.rhs = nil
+		mw.schema = nil
+		mw.typeRef = schema.TypeRef{}
+		mw.rule = nil
+		mw.postItemHook = nil
+		mw.out = nil
+		mw.inLeaf = false
+
+		mwPool.Put(mw)
+	}()
+
+	mw.lhs = &lhs.value
+	mw.rhs = &rhs.value
+	mw.schema = lhs.schema
+	mw.typeRef = lhs.typeRef
+	mw.rule = rule
+	mw.postItemHook = postRule
+
 	errs := mw.merge()
 	if len(errs) > 0 {
 		return nil, errs

vendor/sigs.k8s.io/structured-merge-diff/typed/validate.go

@@ -17,17 +17,33 @@ limitations under the License.
 package typed
 
 import (
+	"sync"
+
 	"sigs.k8s.io/structured-merge-diff/fieldpath"
 	"sigs.k8s.io/structured-merge-diff/schema"
 	"sigs.k8s.io/structured-merge-diff/value"
 )
 
+var vPool = sync.Pool{
+	New: func() interface{} { return &validatingObjectWalker{} },
+}
+
 func (tv TypedValue) walker() *validatingObjectWalker {
-	return &validatingObjectWalker{
-		value:   tv.value,
-		schema:  tv.schema,
-		typeRef: tv.typeRef,
-	}
+	v := vPool.Get().(*validatingObjectWalker)
+	v.value = tv.value
+	v.schema = tv.schema
+	v.typeRef = tv.typeRef
+	return v
+}
+
+func (v *validatingObjectWalker) finished() {
+	v.value = value.Value{}
+	v.schema = nil
+	v.typeRef = schema.TypeRef{}
+	v.leafFieldCallback = nil
+	v.nodeFieldCallback = nil
+	v.inLeaf = false
+	vPool.Put(v)
 }
 
 type validatingObjectWalker struct {
@@ -49,9 +65,36 @@ type validatingObjectWalker struct {
 
 	// internal housekeeping--don't set when constructing.
 	inLeaf bool // Set to true if we're in a "big leaf"--atomic map/list
+
+	// Allocate only as many walkers as needed for the depth by storing them here.
+	spareWalkers *[]*validatingObjectWalker
 }
 
-func (v validatingObjectWalker) validate() ValidationErrors {
+func (v *validatingObjectWalker) prepareDescent(pe fieldpath.PathElement, tr schema.TypeRef) *validatingObjectWalker {
+	if v.spareWalkers == nil {
+		// first descent.
+		v.spareWalkers = &[]*validatingObjectWalker{}
+	}
+	var v2 *validatingObjectWalker
+	if n := len(*v.spareWalkers); n > 0 {
+		v2, *v.spareWalkers = (*v.spareWalkers)[n-1], (*v.spareWalkers)[:n-1]
+	} else {
+		v2 = &validatingObjectWalker{}
+	}
+	*v2 = *v
+	v2.typeRef = tr
+	v2.errorFormatter.descend(pe)
+	return v2
+}
+
+func (v *validatingObjectWalker) finishDescent(v2 *validatingObjectWalker) {
+	// if the descent caused a realloc, ensure that we reuse the buffer
+	// for the next sibling.
+	v.errorFormatter = v2.errorFormatter.parent()
+	*v.spareWalkers = append(*v.spareWalkers, v2)
+}
+
+func (v *validatingObjectWalker) validate() ValidationErrors {
 	return resolveSchema(v.schema, v.typeRef, &v.value, v)
 }
 
@@ -87,7 +130,7 @@ func (v *validatingObjectWalker) doNode() {
 	}
 }
 
-func (v validatingObjectWalker) doScalar(t schema.Scalar) ValidationErrors {
+func (v *validatingObjectWalker) doScalar(t schema.Scalar) ValidationErrors {
 	if errs := v.validateScalar(t, &v.value, ""); len(errs) > 0 {
 		return errs
 	}
@@ -98,7 +141,7 @@ func (v validatingObjectWalker) doScalar(t schema.Scalar) ValidationErrors {
 	return nil
 }
 
-func (v validatingObjectWalker) visitListItems(t schema.List, list *value.List) (errs ValidationErrors) {
+func (v *validatingObjectWalker) visitListItems(t schema.List, list *value.List) (errs ValidationErrors) {
 	observedKeys := map[string]struct{}{}
 	for i, child := range list.Items {
 		pe, err := listItemToPathElement(t, i, child)
@@ -114,18 +157,17 @@ func (v validatingObjectWalker) visitListItems(t schema.List, list *value.List)
 			errs = append(errs, v.errorf("duplicate entries for key %v", keyStr)...)
 		}
 		observedKeys[keyStr] = struct{}{}
-		v2 := v
-		v2.errorFormatter.descend(pe)
+		v2 := v.prepareDescent(pe, t.ElementType)
 		v2.value = child
-		v2.typeRef = t.ElementType
 		errs = append(errs, v2.validate()...)
 
 		v2.doNode()
+		v.finishDescent(v2)
 	}
 	return errs
 }
 
-func (v validatingObjectWalker) doList(t schema.List) (errs ValidationErrors) {
+func (v *validatingObjectWalker) doList(t schema.List) (errs ValidationErrors) {
 	list, err := listValue(v.value)
 	if err != nil {
 		return v.error(err)
@@ -144,7 +186,7 @@ func (v validatingObjectWalker) doList(t schema.List) (errs ValidationErrors) {
 	return errs
 }
 
-func (v validatingObjectWalker) visitMapItems(t schema.Map, m *value.Map) (errs ValidationErrors) {
+func (v *validatingObjectWalker) visitMapItems(t schema.Map, m *value.Map) (errs ValidationErrors) {
 	fieldTypes := map[string]schema.TypeRef{}
 	for i := range t.Fields {
 		// I don't want to use the loop variable since a reference
@@ -153,25 +195,27 @@ func (v validatingObjectWalker) visitMapItems(t schema.Map, m *value.Map) (errs
 		fieldTypes[f.Name] = f.Type
 	}
 
-	for _, item := range m.Items {
-		v2 := v
-		name := item.Name
-		v2.errorFormatter.descend(fieldpath.PathElement{FieldName: &name})
-		v2.value = item.Value
+	for i := range m.Items {
+		item := &m.Items[i]
+		pe := fieldpath.PathElement{FieldName: &item.Name}
 
-		var ok bool
-		if v2.typeRef, ok = fieldTypes[name]; ok {
+		if tr, ok := fieldTypes[item.Name]; ok {
+			v2 := v.prepareDescent(pe, tr)
+			v2.value = item.Value
 			errs = append(errs, v2.validate()...)
+			v.finishDescent(v2)
 		} else {
-			v2.typeRef = t.ElementType
+			v2 := v.prepareDescent(pe, t.ElementType)
+			v2.value = item.Value
 			errs = append(errs, v2.validate()...)
 			v2.doNode()
+			v.finishDescent(v2)
 		}
 	}
 	return errs
 }
 
-func (v validatingObjectWalker) doMap(t schema.Map) (errs ValidationErrors) {
+func (v *validatingObjectWalker) doMap(t schema.Map) (errs ValidationErrors) {
 	m, err := mapValue(v.value)
 	if err != nil {
 		return v.error(err)

vendor/sigs.k8s.io/structured-merge-diff/value/value.go

@@ -34,6 +34,11 @@ type Value struct {
 	Null         bool // represents an explicit `"foo" = null`
 }
 
+// Equals returns true iff the two values are equal.
+func (v Value) Equals(rhs Value) bool {
+	return !v.Less(rhs) && !rhs.Less(v)
+}
+
 // Less provides a total ordering for Value (so that they can be sorted, even
 // if they are of different types).
 func (v Value) Less(rhs Value) bool {
@@ -167,7 +172,7 @@ type Map struct {
 
 	// may be nil; lazily constructed.
 	// TODO: Direct modifications to Items above will cause serious problems.
-	index map[string]*Field
+	index map[string]int
 	// may be empty; lazily constructed.
 	// TODO: Direct modifications to Items above will cause serious problems.
 	order []int
@@ -264,14 +269,16 @@ func (m *Map) Less(rhs *Map) bool {
 // Get returns the (Field, true) or (nil, false) if it is not present
 func (m *Map) Get(key string) (*Field, bool) {
 	if m.index == nil {
-		m.index = map[string]*Field{}
+		m.index = map[string]int{}
 		for i := range m.Items {
-			f := &m.Items[i]
-			m.index[f.Name] = f
+			m.index[m.Items[i].Name] = i
 		}
 	}
 	f, ok := m.index[key]
-	return f, ok
+	if !ok {
+		return nil, false
+	}
+	return &m.Items[f], true
 }
 
 // Set inserts or updates the given item.
@@ -281,7 +288,8 @@ func (m *Map) Set(key string, value Value) {
 		return
 	}
 	m.Items = append(m.Items, Field{Name: key, Value: value})
-	m.index = nil // Since the append might have reallocated
+	i := len(m.Items) - 1
+	m.index[key] = i
 	m.order = nil
 }