382a7f5b3e
Support creating callbacks from pointers. Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>
42 lines
1.1 KiB
Go
42 lines
1.1 KiB
Go
package callback
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import (
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"github.com/nspcc-dev/neo-go/pkg/core/interop"
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"github.com/nspcc-dev/neo-go/pkg/vm"
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"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
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)
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// PointerCallback represents callback for a pointer.
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type PointerCallback struct {
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paramCount int
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offset int
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context *vm.Context
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}
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var _ Callback = (*PointerCallback)(nil)
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// ArgCount implements Callback interface.
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func (p *PointerCallback) ArgCount() int {
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return p.paramCount
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}
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// LoadContext implements Callback interface.
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func (p *PointerCallback) LoadContext(v *vm.VM, args []stackitem.Item) {
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v.Call(p.context, p.offset)
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for i := len(args) - 1; i >= 0; i-- {
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v.Estack().PushVal(args[i])
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}
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}
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// Create creates callback using pointer and parameters count.
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func Create(_ *interop.Context, v *vm.VM) error {
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ctx := v.Estack().Pop().Item().(*vm.Context)
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offset := v.Estack().Pop().Item().(*stackitem.Pointer).Position()
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count := v.Estack().Pop().BigInt().Int64()
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v.Estack().PushVal(stackitem.NewInterop(&PointerCallback{
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paramCount: int(count),
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offset: offset,
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context: ctx,
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}))
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return nil
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}
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