33 lines
776 B
Go
33 lines
776 B
Go
package vm
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import (
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"errors"
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"github.com/CityOfZion/neo-go/pkg/vm/stack"
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)
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// vm exceptions
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// THROWIFNOT faults if the item on the top of the stack
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// does not evaluate to true
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// For specific logic on how a number of bytearray is evaluated can be seen
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// from the boolean conversion methods on the stack items
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func THROWIFNOT(op stack.Instruction, ctx *stack.Context, istack *stack.Invocation, rstack *stack.RandomAccess) (Vmstate, error) {
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// Pop item from top of stack
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item, err := ctx.Estack.Pop()
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if err != nil {
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return FAULT, err
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}
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// Convert to a boolean
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ok, err := item.Boolean()
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if err != nil {
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return FAULT, err
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}
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// If false, throw
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if !ok.Value() {
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return FAULT, errors.New("item on top of stack evaluates to false")
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}
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return NONE, nil
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}
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