neoneo-go/pkg/compiler/vm_test.go

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package compiler_test
import (
"fmt"
"strings"
"testing"
"github.com/nspcc-dev/neo-go/pkg/compiler"
"github.com/nspcc-dev/neo-go/pkg/vm"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
type testCase struct {
name string
src string
result interface{}
}
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func runTestCases(t *testing.T, tcases []testCase) {
for _, tcase := range tcases {
t.Run(tcase.name, func(t *testing.T) { eval(t, tcase.src, tcase.result) })
}
}
func evalWithoutStackChecks(t *testing.T, src string, result interface{}) {
v := vmAndCompile(t, src)
require.NoError(t, v.Run())
assertResult(t, v, result)
}
func eval(t *testing.T, src string, result interface{}) {
vm := vmAndCompile(t, src)
err := vm.Run()
require.NoError(t, err)
assert.Equal(t, 1, vm.Estack().Len(), "stack contains unexpected items")
assertResult(t, vm, result)
}
func evalWithArgs(t *testing.T, src string, op []byte, args []vm.StackItem, result interface{}) {
vm := vmAndCompile(t, src)
vm.LoadArgs(op, args)
err := vm.Run()
require.NoError(t, err)
assert.Equal(t, 1, vm.Estack().Len(), "stack contains unexpected items")
assertResult(t, vm, result)
}
func assertResult(t *testing.T, vm *vm.VM, result interface{}) {
assert.Equal(t, result, vm.PopResult())
assert.Equal(t, 0, vm.Astack().Len())
assert.Equal(t, 0, vm.Istack().Len())
}
func vmAndCompile(t *testing.T, src string) *vm.VM {
vm := vm.New()
storePlugin := newStoragePlugin()
vm.RegisterInteropGetter(storePlugin.getInterop)
b, err := compiler.Compile(strings.NewReader(src))
require.NoError(t, err)
vm.Load(b)
return vm
}
type storagePlugin struct {
mem map[string][]byte
interops map[uint32]vm.InteropFunc
}
func newStoragePlugin() *storagePlugin {
s := &storagePlugin{
mem: make(map[string][]byte),
interops: make(map[uint32]vm.InteropFunc),
}
s.interops[vm.InteropNameToID([]byte("Neo.Storage.Get"))] = s.Get
s.interops[vm.InteropNameToID([]byte("Neo.Storage.Put"))] = s.Put
s.interops[vm.InteropNameToID([]byte("Neo.Storage.GetContext"))] = s.GetContext
return s
}
func (s *storagePlugin) getInterop(id uint32) *vm.InteropFuncPrice {
f := s.interops[id]
if f != nil {
return &vm.InteropFuncPrice{Func: f, Price: 1}
}
return nil
}
func (s *storagePlugin) Delete(vm *vm.VM) error {
vm.Estack().Pop()
key := vm.Estack().Pop().Bytes()
delete(s.mem, string(key))
return nil
}
func (s *storagePlugin) Put(vm *vm.VM) error {
vm.Estack().Pop()
key := vm.Estack().Pop().Bytes()
value := vm.Estack().Pop().Bytes()
s.mem[string(key)] = value
return nil
}
func (s *storagePlugin) Get(vm *vm.VM) error {
vm.Estack().Pop()
item := vm.Estack().Pop().Bytes()
if val, ok := s.mem[string(item)]; ok {
vm.Estack().PushVal(val)
return nil
}
return fmt.Errorf("could not find %+v", item)
}
func (s *storagePlugin) GetContext(vm *vm.VM) error {
// Pushing anything on the stack here will work. This is just to satisfy
// the compiler, thinking it has pushed the context ^^.
vm.Estack().PushVal(10)
return nil
}