86 lines
2.4 KiB
Go
86 lines
2.4 KiB
Go
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package vm
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import (
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"errors"
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"math/big"
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"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
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)
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// exceptionHandlingState represents state of the exception handling process.
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type exceptionHandlingState byte
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const (
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eTry exceptionHandlingState = iota
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eCatch
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eFinally
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)
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// exceptionHandlingContext represents context of the exception handling process.
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type exceptionHandlingContext struct {
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CatchOffset int
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FinallyOffset int
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EndOffset int
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State exceptionHandlingState
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}
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func newExceptionHandlingContext(cOffset, fOffset int) *exceptionHandlingContext {
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return &exceptionHandlingContext{
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CatchOffset: cOffset,
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FinallyOffset: fOffset,
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EndOffset: -1,
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State: eTry,
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}
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}
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// HasCatch returns true iff context has `catch` block.
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func (c *exceptionHandlingContext) HasCatch() bool { return c.CatchOffset >= 0 }
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// HasFinally returns true iff context has `finally` block.
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func (c *exceptionHandlingContext) HasFinally() bool { return c.FinallyOffset >= 0 }
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// String implements stackitem.Item interface.
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func (c *exceptionHandlingContext) String() string {
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return "exception handling context"
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}
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// Value implements stackitem.Item interface.
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func (c *exceptionHandlingContext) Value() interface{} {
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return c
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}
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// Dup implements stackitem.Item interface.
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func (c *exceptionHandlingContext) Dup() stackitem.Item {
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return c
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}
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// Bool implements stackitem.Item interface.
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func (c *exceptionHandlingContext) Bool() bool {
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panic("can't convert exceptionHandlingContext to Bool")
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}
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// TryBytes implements stackitem.Item interface.
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func (c *exceptionHandlingContext) TryBytes() ([]byte, error) {
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return nil, errors.New("can't convert exceptionHandlingContext to ByteArray")
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}
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// TryInteger implements stackitem.Item interface.
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func (c *exceptionHandlingContext) TryInteger() (*big.Int, error) {
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return nil, errors.New("can't convert exceptionHandlingContext to Integer")
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}
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// Type implements stackitem.Item interface.
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func (c *exceptionHandlingContext) Type() stackitem.Type {
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panic("exceptionHandlingContext cannot appear on evaluation stack")
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}
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// Convert implements stackitem.Item interface.
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func (c *exceptionHandlingContext) Convert(_ stackitem.Type) (stackitem.Item, error) {
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panic("exceptionHandlingContext cannot be converted to anything")
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}
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// Equals implements stackitem.Item interface.
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func (c *exceptionHandlingContext) Equals(s stackitem.Item) bool {
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return c == s
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}
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