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core: introduce CheckReturnState constants

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At the moment we should have 3 possible options to check return state
during vm context unloading:
	* no check
	* ensure the stack is empty
	* ensure the stack is not empty

It is necessary to distinguish them because new _deploy method shouldn't
left anything on stack. Example: if we use _deploy method before some
ordinary contract method which returns one value. Without these changes
the contract invocation will fail due to 2 elements on stack left after
invocation (the first `null` element is from _deploy, the second element
is return-value from the ordinary contract method).
This commit is contained in:
Anna Shaleva 2020-10-12 14:32:27 +03:00
parent 659fb89beb
commit fe1f0a7245
5 changed files with 29 additions and 9 deletions
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2
pkg/core/interop_neo.go
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@ -203,7 +203,7 @@ func callDeploy(ic *interop.Context, cs *state.Contract, isUpdate bool) error {
md := cs.Manifest.ABI.GetMethod(manifest.MethodDeploy)
if md != nil {
return contract.CallExInternal(ic, cs, manifest.MethodDeploy,
[]stackitem.Item{stackitem.NewBool(isUpdate)}, smartcontract.All)
[]stackitem.Item{stackitem.NewBool(isUpdate)}, smartcontract.All, vm.EnsureIsEmpty)
}
return nil
}