a7457d08a1
This solves two problems: * adds support for shortened SYSCALL form that uses IDs (similar to #434, but for NEO 2.0, supporting both forms), which is important for compatibility with C# node and mainnet chain that uses it from some height * reworks interop plugging to use callbacks rather than appending to the map, these map mangling functions are clearly visible in the VM profiling statistics and we want spawning a VM to be fast, so it makes sense optimizing it. This change moves most of the work to the init() phase making VM setup cheaper. Caveats: * InteropNameToID accepts `[]byte` because that's the thing we have in SYSCALL processing and that's the most often usecase for it, it leads to some conversions in other places but that's acceptable because those are either tests or init() * three getInterop functions are: `getDefaultVMInterop`, `getSystemInterop` and `getNeoInterop` Our 100K (1.4M->1.5M) block import time improves by ~4% with this change.
109 lines
2.9 KiB
Go
109 lines
2.9 KiB
Go
package vm
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import (
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"crypto/sha256"
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"encoding/binary"
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"errors"
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"fmt"
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"sort"
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)
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// InteropFunc allows to hook into the VM.
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type InteropFunc func(vm *VM) error
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// InteropFuncPrice represents an interop function with a price.
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type InteropFuncPrice struct {
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Func InteropFunc
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Price int
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}
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// interopIDFuncPrice adds an ID to the InteropFuncPrice.
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type interopIDFuncPrice struct {
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ID uint32
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InteropFuncPrice
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}
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// InteropGetterFunc is a function that returns an interop function-price
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// structure by the given interop ID.
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type InteropGetterFunc func(uint32) *InteropFuncPrice
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var defaultVMInterops = []interopIDFuncPrice{
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{InteropNameToID([]byte("Neo.Runtime.Log")),
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InteropFuncPrice{runtimeLog, 1}},
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{InteropNameToID([]byte("Neo.Runtime.Notify")),
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InteropFuncPrice{runtimeNotify, 1}},
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{InteropNameToID([]byte("Neo.Runtime.Serialize")),
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InteropFuncPrice{RuntimeSerialize, 1}},
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{InteropNameToID([]byte("System.Runtime.Serialize")),
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InteropFuncPrice{RuntimeSerialize, 1}},
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{InteropNameToID([]byte("Neo.Runtime.Deserialize")),
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InteropFuncPrice{RuntimeDeserialize, 1}},
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{InteropNameToID([]byte("System.Runtime.Deserialize")),
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InteropFuncPrice{RuntimeDeserialize, 1}},
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}
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func getDefaultVMInterop(id uint32) *InteropFuncPrice {
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n := sort.Search(len(defaultVMInterops), func(i int) bool {
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return defaultVMInterops[i].ID >= id
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})
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if n < len(defaultVMInterops) && defaultVMInterops[n].ID == id {
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return &defaultVMInterops[n].InteropFuncPrice
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}
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return nil
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}
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// InteropNameToID returns an identificator of the method based on its name.
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func InteropNameToID(name []byte) uint32 {
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h := sha256.Sum256(name)
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return binary.LittleEndian.Uint32(h[:4])
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}
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// runtimeLog handles the syscall "Neo.Runtime.Log" for printing and logging stuff.
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func runtimeLog(vm *VM) error {
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item := vm.Estack().Pop()
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fmt.Printf("NEO-GO-VM (log) > %s\n", item.Value())
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return nil
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}
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// runtimeNotify handles the syscall "Neo.Runtime.Notify" for printing and logging stuff.
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func runtimeNotify(vm *VM) error {
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item := vm.Estack().Pop()
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fmt.Printf("NEO-GO-VM (notify) > %s\n", item.Value())
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return nil
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}
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// RuntimeSerialize handles syscalls System.Runtime.Serialize and Neo.Runtime.Serialize.
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func RuntimeSerialize(vm *VM) error {
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item := vm.Estack().Pop()
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data, err := serializeItem(item.value)
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if err != nil {
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return err
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} else if len(data) > MaxItemSize {
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return errors.New("too big item")
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}
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vm.Estack().PushVal(data)
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return nil
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}
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// RuntimeDeserialize handles syscalls System.Runtime.Deserialize and Neo.Runtime.Deserialize.
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func RuntimeDeserialize(vm *VM) error {
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data := vm.Estack().Pop().Bytes()
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item, err := deserializeItem(data)
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if err != nil {
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return err
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}
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vm.Estack().Push(&Element{value: item})
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return nil
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}
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// init sorts the global defaultVMInterops value.
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func init() {
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sort.Slice(defaultVMInterops, func(i, j int) bool {
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return defaultVMInterops[i].ID < defaultVMInterops[j].ID
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})
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}
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