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vm: abstract out GetInterop() function

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This commit is contained in:
Evgenii Stratonikov 2020-01-20 11:41:40 +03:00
parent c22d09adad
commit d72d978a19
1 changed files with 23 additions and 14 deletions
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37
pkg/vm/vm.go
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@ -474,6 +474,27 @@ func (v *VM) SetScriptGetter(gs func(util.Uint160) []byte) {
v.getScript = gs
}
// GetInteropID converts instruction parameter to an interop ID.
func GetInteropID(parameter []byte) uint32 {
if len(parameter) == 4 {
return binary.LittleEndian.Uint32(parameter)
}
return InteropNameToID(parameter)
}
// GetInteropByID returns interop function together with price.
// Registered callbacks are checked in LIFO order.
func (v *VM) GetInteropByID(id uint32) *InteropFuncPrice {
for i := len(v.getInterop) - 1; i >= 0; i-- {
if ifunc := v.getInterop[i](id); ifunc != nil {
return ifunc
}
}
return nil
}
// execute performs an instruction cycle in the VM. Acting on the instruction (opcode).
func (v *VM) execute(ctx *Context, op opcode.Opcode, parameter []byte) (err error) {
// Instead of polluting the whole VM logic with error handling, we will recover
@ -1114,21 +1135,9 @@ func (v *VM) execute(ctx *Context, op opcode.Opcode, parameter []byte) (err erro
}
case opcode.SYSCALL:
var ifunc *InteropFuncPrice
var interopID uint32
interopID := GetInteropID(parameter)
ifunc := v.GetInteropByID(interopID)
if len(parameter) == 4 {
interopID = binary.LittleEndian.Uint32(parameter)
} else {
interopID = InteropNameToID(parameter)
}
// LIFO interpretation of callbacks.
for i := len(v.getInterop) - 1; i >= 0; i-- {
ifunc = v.getInterop[i](interopID)
if ifunc != nil {
break
}
}
if ifunc == nil {
panic(fmt.Sprintf("interop hook (%q/0x%x) not registered", parameter, interopID))
}