//===-- llvm/Support/DOTGraphTraits.h - Customize .dot output ---*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file defines a template class that can be used to customize dot output
// graphs generated by the GraphWriter.h file. The default implementation of
// this file will produce a simple, but not very polished graph. By
// specializing this template, lots of customization opportunities are possible.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_SUPPORT_DOTGRAPHTRAITS_H
#define LLVM_SUPPORT_DOTGRAPHTRAITS_H
#include <string>
namespace llvm {
/// DefaultDOTGraphTraits - This class provides the default implementations of
/// all of the DOTGraphTraits methods. If a specialization does not need to
/// override all methods here it should inherit so that it can get the default
/// implementations.
///
struct DefaultDOTGraphTraits {
private:
bool IsSimple;
protected:
bool isSimple() {
return IsSimple;
}
public:
explicit DefaultDOTGraphTraits(bool simple=false) : IsSimple (simple) {}
/// getGraphName - Return the label for the graph as a whole. Printed at the
/// top of the graph.
///
template<typename GraphType>
static std::string getGraphName(const GraphType &) { return ""; }
/// getGraphProperties - Return any custom properties that should be included
/// in the top level graph structure for dot.
///
template<typename GraphType>
static std::string getGraphProperties(const GraphType &) {
return "";
}
/// renderGraphFromBottomUp - If this function returns true, the graph is
/// emitted bottom-up instead of top-down. This requires graphviz 2.0 to work
/// though.
static bool renderGraphFromBottomUp() {
return false;
}
/// isNodeHidden - If the function returns true, the given node is not
/// displayed in the graph.
template <typename GraphType>
static bool isNodeHidden(const void *, const GraphType &) {
return false;
}
// renderNodesUsingHTML - If the function returns true, nodes will be
// rendered using HTML-like labels which allows colors, etc in the nodes
// and the edge source labels.
static bool renderNodesUsingHTML() { return false; }
/// getNodeLabel - Given a node and a pointer to the top level graph, return
/// the label to print in the node.
template<typename GraphType>
std::string getNodeLabel(const void *, const GraphType &) {
return "";
}
// getNodeIdentifierLabel - Returns a string representing the
// address or other unique identifier of the node. (Only used if
// non-empty.)
template <typename GraphType>
static std::string getNodeIdentifierLabel(const void *, const GraphType &) {
return "";
}
template<typename GraphType>
static std::string getNodeDescription(const void *, const GraphType &) {
return "";
}
/// If you want to specify custom node attributes, this is the place to do so
///
template<typename GraphType>
static std::string getNodeAttributes(const void *,
const GraphType &) {
return "";
}
/// If you want to override the dot attributes printed for a particular edge,
/// override this method.
template<typename EdgeIter, typename GraphType>
static std::string getEdgeAttributes(const void *, EdgeIter,
const GraphType &) {
return "";
}
/// getEdgeSourceLabel - If you want to label the edge source itself,
/// implement this method.
template<typename EdgeIter>
static std::string getEdgeSourceLabel(const void *, EdgeIter) {
return "";
}
/// edgeTargetsEdgeSource - This method returns true if this outgoing edge
/// should actually target another edge source, not a node. If this method is
/// implemented, getEdgeTarget should be implemented.
template<typename EdgeIter>
static bool edgeTargetsEdgeSource(const void *, EdgeIter) {
return false;
}
/// getEdgeTarget - If edgeTargetsEdgeSource returns true, this method is
/// called to determine which outgoing edge of Node is the target of this
/// edge.
template<typename EdgeIter>
static EdgeIter getEdgeTarget(const void *, EdgeIter I) {
return I;
}
/// hasEdgeDestLabels - If this function returns true, the graph is able
/// to provide labels for edge destinations.
static bool hasEdgeDestLabels() {
return false;
}
/// numEdgeDestLabels - If hasEdgeDestLabels, this function returns the
/// number of incoming edge labels the given node has.
static unsigned numEdgeDestLabels(const void *) {
return 0;
}
/// getEdgeDestLabel - If hasEdgeDestLabels, this function returns the
/// incoming edge label with the given index in the given node.
static std::string getEdgeDestLabel(const void *, unsigned) {
return "";
}
/// addCustomGraphFeatures - If a graph is made up of more than just
/// straight-forward nodes and edges, this is the place to put all of the
/// custom stuff necessary. The GraphWriter object, instantiated with your
/// GraphType is passed in as an argument. You may call arbitrary methods on
/// it to add things to the output graph.
///
template<typename GraphType, typename GraphWriter>
static void addCustomGraphFeatures(const GraphType &, GraphWriter &) {}
};
/// DOTGraphTraits - Template class that can be specialized to customize how
/// graphs are converted to 'dot' graphs. When specializing, you may inherit
/// from DefaultDOTGraphTraits if you don't need to override everything.
///
template <typename Ty>
struct DOTGraphTraits : public DefaultDOTGraphTraits {
DOTGraphTraits (bool simple=false) : DefaultDOTGraphTraits (simple) {}
};
} // End llvm namespace
#endif