Function SetConstraintStateCreate

src/backend/commands/trigger.c:5257–5277

* Create an empty SetConstraintState with room for numalloc trigstates */

 * Create an empty SetConstraintState with room for numalloc trigstates
 */
static SetConstraintState
SetConstraintStateCreate(int numalloc)
{
	SetConstraintState state;

	/* Behave sanely with numalloc == 0 */
	if (numalloc <= 0)
		numalloc = 1;

	/*
	 * We assume that zeroing will correctly initialize the state values.
	 */
	state = (SetConstraintState)
		MemoryContextAllocZero(TopTransactionContext,
							   offsetof(SetConstraintStateData, trigstates) +
							   numalloc * sizeof(SetConstraintTriggerData));

	state->numalloc = numalloc;

	return state;
}

/*
 * Copy a SetConstraintState