Simulation with print output

Once a CIF specification with print declarations is available, the simulator can be used to generate textual output. This page discusses the following simulation related topics:

Overwriting files

If output is printed to files, those files are always overwritten for each simulation. That is, at the start of the simulation, the output file is removed if present. A new empty file is then created, to which the output is printed during the simulation.

Line-based output

Output is printed in a line-based fashion. That is, every time text is printed for a print declaration, the text is printed on a new line. If a single print declaration has two texts, one for the pre/source state and one for the post/target state, both texts are printed on new lines.

Output order

The simulator guarantees that once text is printed for a certain state, no text shall ever be printed during that same simulation, for previous states. That is, output text is ordered by ‘increasing’ states. This guarantee holds for file output. For the special targets standard output stream (stdout) and standard error stream (stderr), the output may get mixed, for instance on the Eclipse console.

The order in which text is printed for different print declarations that print text for the same state, is determined by the order in which the print declarations are specified in the CIF specification, from top to bottom. The order is determined per file or special target, after elimination of imports, component definition/instantiation, etc. A depth-first traversal of the component hierarchy is used, where the print declarations of components are considered before the print declarations of their children.

Enabling/disabling print output

Print output is enabled by default. It can be disabled by reducing the types of normal console output using the Normal output option (Output category). Using that option it is also possible to disable all other forms of normal output, to be able to see only the print output on the console. Print output can also be disabled by changing the output mode to Error or to Warning, instead of Normal.


By undoing one or more transitions, or by resetting the simulation, the state may change. However, only previously taken transitions are undone. No new transitions are taken by undoing transitions, or by resetting the simulation. As such, no new print output is generated.