You can find general information on the ordering of variables in the Reference Manual, in the section about “Stochastic solution and simulation”.
In order to link eigenvalues to variables, you need to understand how the generalized schur decomposition is applied. You can have a look at the “dr.pdf” file (section 4.1) which comes in Dynare and which describes precisely how this decomposition is done. However, the actual implementation may differ a little bit from this document, so in the last analysis, you may need to go through the source of dr1.m to figure this out.