class_docstr: A pass instrument implementation.
  
  To use, a user class can either subclass from PassInstrument
  directly, or can apply the :py:func:`pass_instrument` wrapper.  In
  either case, the `enter_pass_ctx`, `exit_pass_ctx`, `should_run`,
  `run_before_pass`, and `run_after_pass` methods can be defined to
  adjust the instrument's behavior.  See the no-op implementations
  in this class definition for more information on each.
docstr: Called when entering the instrumented context.
  
  Returns
  -------
  None
docstr_tok: ["Called","when","entering","the","instrumented","context",".","Returns","--","--","--","-","None"]
code: def enter_pass_ctx(self):
      """Called when entering the instrumented context.
  
      Returns
      -------
      None
      """
  
imports: import inspect
  import functools
  import tvm._ffi
  import tvm.runtime
  from .None import _ffi_instrument_api
label_desc: Use image node_id 2 for calling the PassInstrument obj's underlying member method code with example usage: obj.enter_pass_ctx() without return types