neo-go/pkg/vm/interop.go

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package vm
import (
"errors"
"fmt"
"sort"
"github.com/nspcc-dev/neo-go/pkg/core/interop/interopnames"
"github.com/nspcc-dev/neo-go/pkg/smartcontract/callflag"
)
// interopIDFuncPrice adds an ID to the InteropFuncPrice.
type interopIDFuncPrice struct {
ID uint32
Func func(vm *VM) error
Price int64
RequiredFlags callflag.CallFlag
}
var defaultVMInterops = []interopIDFuncPrice{
{ID: interopnames.ToID([]byte(interopnames.SystemRuntimeLog)),
Func: runtimeLog, Price: 1 << 15, RequiredFlags: callflag.AllowNotify},
{ID: interopnames.ToID([]byte(interopnames.SystemRuntimeNotify)),
Func: runtimeNotify, Price: 1 << 15, RequiredFlags: callflag.AllowNotify},
}
func init() {
sort.Slice(defaultVMInterops, func(i, j int) bool { return defaultVMInterops[i].ID < defaultVMInterops[j].ID })
}
func defaultSyscallHandler(v *VM, id uint32) error {
n := sort.Search(len(defaultVMInterops), func(i int) bool {
return defaultVMInterops[i].ID >= id
})
if n >= len(defaultVMInterops) || defaultVMInterops[n].ID != id {
return errors.New("syscall not found")
}
d := defaultVMInterops[n]
if !v.Context().callFlag.Has(d.RequiredFlags) {
return fmt.Errorf("missing call flags: %05b vs %05b", v.Context().callFlag, d.RequiredFlags)
}
return d.Func(v)
}
// runtimeLog handles the syscall "System.Runtime.Log" for printing and logging stuff.
func runtimeLog(vm *VM) error {
msg := vm.Estack().Pop().String()
fmt.Printf("NEO-GO-VM (log) > %s\n", msg)
return nil
}
// runtimeNotify handles the syscall "System.Runtime.Notify" for printing and logging stuff.
func runtimeNotify(vm *VM) error {
name := vm.Estack().Pop().String()
item := vm.Estack().Pop()
fmt.Printf("NEO-GO-VM (notify) > [%s] %s\n", name, item.Value())
return nil
}
// init sorts the global defaultVMInterops value.
func init() {
sort.Slice(defaultVMInterops, func(i, j int) bool {
return defaultVMInterops[i].ID < defaultVMInterops[j].ID
})
}