Commits on Apr 8, 2022

1. Improve reporting of errors in vm/vmgen …

   Reporting of guest code related errors was done in an inconsistent
   manner via either `stackTrace` or `globalReport`, where `stackTrace` used
   `localReport` and an injected `return` statement to terminate the
   execution loop. `stackTrace` was sometimes used in nested functions,
   thus not terminating execution at all.
   
   ## Changes
   Both the execution engine and `vmgen` now use exceptions for error
   propagation internally, translating them into a result value at their
   respective interface edges. In case of an error, the result value stores the
   error report. Otherwise, it stores the actual result.
   
   In addition, some usages of `globalReport` are also replaced with the
    new error propagation mechanism.
   
   Depending on whether or not a VM invocation is expected to return
   something, errors reported from VM execution and/or `vmgen` are either
    turned into a `nkError` node or handled directly via `handleReport`

   

   zerbina committed Apr 8, 2022
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