dump: Handle cycles in graphviz #1977
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Identify if the current graph entry must be skipped druing `dump`, which is done during the add_graph_entry() procedure. Basic idea is to find recursive calls, but the first recursive call cannot be skipped. For example, if the call trace shows: main - fib - fib - fib then the first (fib - fib) must be present but the second must be skipped, making the graph look like: main - fib - fib To separate recursive calls from the first recursive call, determine if the node's name is the same with curr and additionally check if curr->parent's name is the same as well. Signed-off-by: Daon Park <[email protected]>
If a node is skipped due to being a recursive call, then it's nr_calls must be correctly appended to the first recursive call. During the `add_graph_entry()` procedure, it looks for the source of the first recursive call and saves it to recursive_src. Next, if the current graph entry node is skipped, then the nr_calls is added to the add_calls_tgt. Signed-off-by: Daon Park <[email protected]>
If a node is marked as True in the skip variable, the dump file will not record that node. Signed-off-by: Daon Park <[email protected]>
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These commits include skipping the recursive calls during the dump of graphviz, and correctly adding number of calls of the skipped entries to the initial recursive call.
Fixed: #1500