vm: move InvocationTree into a package of its own

result.Invoke shouldn't depend on vm.

pkg/rpc/response/result/invoke.go

@@ -10,7 +10,7 @@ import (
 	"github.com/nspcc-dev/neo-go/pkg/core/state"
 	"github.com/nspcc-dev/neo-go/pkg/core/storage"
 	"github.com/nspcc-dev/neo-go/pkg/core/transaction"
-	"github.com/nspcc-dev/neo-go/pkg/vm"
+	"github.com/nspcc-dev/neo-go/pkg/vm/invocations"
 	"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
 )
 
@@ -37,7 +37,7 @@ type RegisterIterator func(sessionID string, item stackitem.Item, id int, finali
 // InvokeDiag is an additional diagnostic data for invocation.
 type InvokeDiag struct {
 	Changes     []storage.Operation `json:"storagechanges"`
-	Invocations []*vm.InvocationTree `json:"invokedcontracts"`
+	Invocations []*invocations.Tree `json:"invokedcontracts"`
 }
 
 // NewInvoke returns a new Invoke structure with the given fields set.

pkg/rpc/server/server_test.go

@@ -41,8 +41,8 @@ import (
 	rpc2 "github.com/nspcc-dev/neo-go/pkg/services/oracle/broadcaster"
 	"github.com/nspcc-dev/neo-go/pkg/smartcontract/trigger"
 	"github.com/nspcc-dev/neo-go/pkg/util"
-	"github.com/nspcc-dev/neo-go/pkg/vm"
 	"github.com/nspcc-dev/neo-go/pkg/vm/emit"
+	"github.com/nspcc-dev/neo-go/pkg/vm/invocations"
 	"github.com/nspcc-dev/neo-go/pkg/vm/opcode"
 	"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
 	"github.com/nspcc-dev/neo-go/pkg/vm/vmstate"
@@ -962,12 +962,12 @@ var rpcTestCases = map[string][]rpcTestCase{
 					Notifications: []state.NotificationEvent{},
 					Diagnostics: &result.InvokeDiag{
 						Changes: []storage.Operation{},
-						Invocations: []*vm.InvocationTree{{
+						Invocations: []*invocations.Tree{{
 							Current: hash.Hash160(script),
-							Calls: []*vm.InvocationTree{
+							Calls: []*invocations.Tree{
 								{
 									Current: nnsHash,
-									Calls: []*vm.InvocationTree{
+									Calls: []*invocations.Tree{
 										{
 											Current: stdHash,
 										},
@@ -1075,12 +1075,12 @@ var rpcTestCases = map[string][]rpcTestCase{
 					Notifications: []state.NotificationEvent{},
 					Diagnostics: &result.InvokeDiag{
 						Changes: []storage.Operation{},
-						Invocations: []*vm.InvocationTree{{
+						Invocations: []*invocations.Tree{{
 							Current: hash.Hash160(script),
-							Calls: []*vm.InvocationTree{
+							Calls: []*invocations.Tree{
 								{
 									Current: nnsHash,
-									Calls: []*vm.InvocationTree{
+									Calls: []*invocations.Tree{
 										{
 											Current: stdHash,
 										},
@@ -1167,7 +1167,7 @@ var rpcTestCases = map[string][]rpcTestCase{
 					Notifications:  []state.NotificationEvent{},
 					Diagnostics: &result.InvokeDiag{
 						Changes: []storage.Operation{},
-						Invocations: []*vm.InvocationTree{{
+						Invocations: []*invocations.Tree{{
 							Current: hash.Hash160(script),
 						}},
 					},
@@ -1278,7 +1278,7 @@ var rpcTestCases = map[string][]rpcTestCase{
 					Notifications:  []state.NotificationEvent{},
 					Diagnostics: &result.InvokeDiag{
 						Changes: []storage.Operation{},
-						Invocations: []*vm.InvocationTree{{
+						Invocations: []*invocations.Tree{{
 							Current: hash.Hash160(script),
 						}},
 					},

pkg/vm/context.go

@@ -11,6 +11,7 @@ import (
 	"github.com/nspcc-dev/neo-go/pkg/smartcontract/callflag"
 	"github.com/nspcc-dev/neo-go/pkg/smartcontract/nef"
 	"github.com/nspcc-dev/neo-go/pkg/util"
+	"github.com/nspcc-dev/neo-go/pkg/vm/invocations"
 	"github.com/nspcc-dev/neo-go/pkg/vm/opcode"
 	"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
 )
@@ -53,7 +54,7 @@ type Context struct {
 	// NEF represents a NEF file for the current contract.
 	NEF *nef.File
 	// invTree is an invocation tree (or branch of it) for this context.
-	invTree *InvocationTree
+	invTree *invocations.Tree
 	// onUnload is a callback that should be called after current context unloading
 	// if no exception occurs.
 	onUnload ContextUnloadCallback

pkg/vm/invocation_tree.go

@@ -1,12 +0,0 @@
-package vm
-
-import (
-	"github.com/nspcc-dev/neo-go/pkg/util"
-)
-
-// InvocationTree represents a tree with script hashes; when traversing it,
-// you can see how contracts called each other.
-type InvocationTree struct {
-	Current util.Uint160      `json:"hash"`
-	Calls   []*InvocationTree `json:"call,omitempty"`
-}

pkg/vm/invocation_tree_test.go

@@ -4,6 +4,7 @@ import (
 	"testing"
 
 	"github.com/nspcc-dev/neo-go/pkg/util"
+	"github.com/nspcc-dev/neo-go/pkg/vm/invocations"
 	"github.com/nspcc-dev/neo-go/pkg/vm/opcode"
 	"github.com/stretchr/testify/require"
 )
@@ -36,13 +37,13 @@ func TestInvocationTree(t *testing.T) {
 	topHash := v.Context().ScriptHash()
 	require.NoError(t, v.Run())
 
-	res := &InvocationTree{
-		Calls: []*InvocationTree{{
+	res := &invocations.Tree{
+		Calls: []*invocations.Tree{{
 			Current: topHash,
-			Calls: []*InvocationTree{
+			Calls: []*invocations.Tree{
 				{
 					Current: util.Uint160{1},
-					Calls: []*InvocationTree{
+					Calls: []*invocations.Tree{
 						{
 							Current: util.Uint160{2},
 						},
@@ -53,7 +54,7 @@ func TestInvocationTree(t *testing.T) {
 				},
 				{
 					Current: util.Uint160{4},
-					Calls: []*InvocationTree{
+					Calls: []*invocations.Tree{
 						{
 							Current: util.Uint160{5},
 						},

pkg/vm/invocations/invocation_tree.go

@@ -0,0 +1,12 @@
+package invocations
+
+import (
+	"github.com/nspcc-dev/neo-go/pkg/util"
+)
+
+// Tree represents a tree with script hashes; when traversing it,
+// you can see how contracts called each other.
+type Tree struct {
+	Current util.Uint160 `json:"hash"`
+	Calls   []*Tree      `json:"call,omitempty"`
+}

pkg/vm/vm.go

@@ -21,6 +21,7 @@ import (
 	"github.com/nspcc-dev/neo-go/pkg/smartcontract/trigger"
 	"github.com/nspcc-dev/neo-go/pkg/util"
 	"github.com/nspcc-dev/neo-go/pkg/util/slice"
+	"github.com/nspcc-dev/neo-go/pkg/vm/invocations"
 	"github.com/nspcc-dev/neo-go/pkg/vm/opcode"
 	"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
 	"github.com/nspcc-dev/neo-go/pkg/vm/vmstate"
@@ -87,7 +88,7 @@ type VM struct {
 	trigger trigger.Type
 
 	// invTree is a top-level invocation tree (if enabled).
-	invTree *InvocationTree
+	invTree *invocations.Tree
 }
 
 var (
@@ -271,11 +272,11 @@ func (v *VM) LoadFileWithFlags(path string, f callflag.CallFlag) error {
 
 // CollectInvocationTree enables collecting invocation tree data.
 func (v *VM) EnableInvocationTree() {
-	v.invTree = &InvocationTree{}
+	v.invTree = &invocations.Tree{}
 }
 
 // GetInvocationTree returns the current invocation tree structure.
-func (v *VM) GetInvocationTree() *InvocationTree {
+func (v *VM) GetInvocationTree() *invocations.Tree {
 	return v.invTree
 }
 
@@ -356,7 +357,7 @@ func (v *VM) loadScriptWithCallingHash(b []byte, exe *nef.File, caller util.Uint
 		if parent != nil {
 			curTree = parent.invTree
 		}
-		newTree := &InvocationTree{Current: ctx.ScriptHash()}
+		newTree := &invocations.Tree{Current: ctx.ScriptHash()}
 		curTree.Calls = append(curTree.Calls, newTree)
 		ctx.invTree = newTree
 	}