Called By

Show what calls a selected function, directly or indirectly, including through virtual dispatch.

For a selected function, this shows an edge from each function that calls it, then recurses into whatever calls those functions in turn, building a multi-level tree of callers.

Whenever a call could have come from more than one target at runtime — like through virtual dispatch or a function pointer — the graph shows all possible targets.

Rooted at callDemo below, the graph shows it's called directly by CallbyDerivedA::pureVirtualCall and by altFirst. CallbyDerivedA::pureVirtualCall is itself called directly by first, and is also reachable from first through a virtual call on CallbyBase::pureVirtualCall. The inverse graph, Calls, shows the reverse relationship — everything the selected function calls.

See the following code and corresponding graph

void callDemo(int n);

class CallbyBase {
public:
  virtual void pureVirtualCall() = 0;
};

class CallbyDerivedA : public CallbyBase {
public:
  void pureVirtualCall() override { callDemo(0); };
};

class CallbyDerivedB : public CallbyBase {
public:
  void pureVirtualCall() override {};
};

void first()
{
  CallbyDerivedA obj;
  obj.pureVirtualCall(); // direct call

  CallbyBase *base = &obj;
  base->pureVirtualCall(); // virtual call
}

void altFirst()
{
  callDemo(1);
}

Called By - Classic

The Classic variant is similar to the Simplified variant, showing all relationships in a simple tree, but it uses a custom layout algorithm instead of Graphviz.

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Called By - Cluster

The Cluster variant groups entities by their containing class/file/architecture.

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Called By - Compare

The Compare variant shows how the graph has changed relative to the project's comparison database.

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Called By - Relationship

The Relationship variant filters the graph to only paths connecting the two entities.

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Called By - Simplified

The Simplified variant shows all relationships in a simple tree (no clusters)

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