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<h3 class="section">23.8 Controlling which passes are being run</h3>
<p>After the original gate function for a pass is called, its result
- the gate status - is stored as an integer.
Then the event <code>PLUGIN_OVERRIDE_GATE</code> is invoked, with a pointer
to the gate status in the <code>gcc_data</code> parameter to the callback function.
A nonzero value of the gate status means that the pass is to be executed.
You can both read and write the gate status via the passed pointer.
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