@Override
	public void invalidateCache(boolean all) {
		variableStorageMgr.invalidateCache(all);
		lock.acquire();
		try {
			cache.invalidate();
			dynamicSymbolAddressMap.reconcile();
		}
		finally {
			lock.release();
		}
	}
Returns the next available external symbol address

@return the address
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/symbol/SymbolManager.java