1//===-- llvm/Support/DOTGraphTraits.h - Customize .dot output ---*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file defines a template class that can be used to customize dot output
10// graphs generated by the GraphWriter.h file. The default implementation of
11// this file will produce a simple, but not very polished graph. By
12// specializing this template, lots of customization opportunities are possible.
13//
14//===----------------------------------------------------------------------===//
15
16#ifndef LLVM_SUPPORT_DOTGRAPHTRAITS_H
17#define LLVM_SUPPORT_DOTGRAPHTRAITS_H
18
19#include <string>
20
21namespace llvm {
22
23/// DefaultDOTGraphTraits - This class provides the default implementations of
24/// all of the DOTGraphTraits methods. If a specialization does not need to
25/// override all methods here it should inherit so that it can get the default
26/// implementations.
27///
28struct DefaultDOTGraphTraits {
29private:
30 bool IsSimple;
31
32protected:
33 bool isSimple() {
34 return IsSimple;
35 }
36
37public:
38 explicit DefaultDOTGraphTraits(bool simple=false) : IsSimple (simple) {}
39
40 /// getGraphName - Return the label for the graph as a whole. Printed at the
41 /// top of the graph.
42 ///
43 template<typename GraphType>
44 static std::string getGraphName(const GraphType &) { return ""; }
45
46 /// getGraphProperties - Return any custom properties that should be included
47 /// in the top level graph structure for dot.
48 ///
49 template<typename GraphType>
50 static std::string getGraphProperties(const GraphType &) {
51 return "";
52 }
53
54 /// renderGraphFromBottomUp - If this function returns true, the graph is
55 /// emitted bottom-up instead of top-down. This requires graphviz 2.0 to work
56 /// though.
57 static bool renderGraphFromBottomUp() {
58 return false;
59 }
60
61 /// isNodeHidden - If the function returns true, the given node is not
62 /// displayed in the graph.
63 template <typename GraphType>
64 static bool isNodeHidden(const void *, const GraphType &) {
65 return false;
66 }
67
68 // renderNodesUsingHTML - If the function returns true, nodes will be
69 // rendered using HTML-like labels which allows colors, etc in the nodes
70 // and the edge source labels.
71 static bool renderNodesUsingHTML() { return false; }
72
73 /// getNodeLabel - Given a node and a pointer to the top level graph, return
74 /// the label to print in the node.
75 template<typename GraphType>
76 std::string getNodeLabel(const void *, const GraphType &) {
77 return "";
78 }
79
80 // getNodeIdentifierLabel - Returns a string representing the
81 // address or other unique identifier of the node. (Only used if
82 // non-empty.)
83 template <typename GraphType>
84 static std::string getNodeIdentifierLabel(const void *, const GraphType &) {
85 return "";
86 }
87
88 template<typename GraphType>
89 static std::string getNodeDescription(const void *, const GraphType &) {
90 return "";
91 }
92
93 /// If you want to specify custom node attributes, this is the place to do so
94 ///
95 template<typename GraphType>
96 static std::string getNodeAttributes(const void *,
97 const GraphType &) {
98 return "";
99 }
100
101 /// If you want to override the dot attributes printed for a particular edge,
102 /// override this method.
103 template<typename EdgeIter, typename GraphType>
104 static std::string getEdgeAttributes(const void *, EdgeIter,
105 const GraphType &) {
106 return "";
107 }
108
109 /// getEdgeSourceLabel - If you want to label the edge source itself,
110 /// implement this method.
111 template<typename EdgeIter>
112 static std::string getEdgeSourceLabel(const void *, EdgeIter) {
113 return "";
114 }
115
116 /// edgeTargetsEdgeSource - This method returns true if this outgoing edge
117 /// should actually target another edge source, not a node. If this method is
118 /// implemented, getEdgeTarget should be implemented.
119 template<typename EdgeIter>
120 static bool edgeTargetsEdgeSource(const void *, EdgeIter) {
121 return false;
122 }
123
124 /// getEdgeTarget - If edgeTargetsEdgeSource returns true, this method is
125 /// called to determine which outgoing edge of Node is the target of this
126 /// edge.
127 template<typename EdgeIter>
128 static EdgeIter getEdgeTarget(const void *, EdgeIter I) {
129 return I;
130 }
131
132 /// hasEdgeDestLabels - If this function returns true, the graph is able
133 /// to provide labels for edge destinations.
134 static bool hasEdgeDestLabels() {
135 return false;
136 }
137
138 /// numEdgeDestLabels - If hasEdgeDestLabels, this function returns the
139 /// number of incoming edge labels the given node has.
140 static unsigned numEdgeDestLabels(const void *) {
141 return 0;
142 }
143
144 /// getEdgeDestLabel - If hasEdgeDestLabels, this function returns the
145 /// incoming edge label with the given index in the given node.
146 static std::string getEdgeDestLabel(const void *, unsigned) {
147 return "";
148 }
149
150 /// addCustomGraphFeatures - If a graph is made up of more than just
151 /// straight-forward nodes and edges, this is the place to put all of the
152 /// custom stuff necessary. The GraphWriter object, instantiated with your
153 /// GraphType is passed in as an argument. You may call arbitrary methods on
154 /// it to add things to the output graph.
155 ///
156 template<typename GraphType, typename GraphWriter>
157 static void addCustomGraphFeatures(const GraphType &, GraphWriter &) {}
158};
159
160
161/// DOTGraphTraits - Template class that can be specialized to customize how
162/// graphs are converted to 'dot' graphs. When specializing, you may inherit
163/// from DefaultDOTGraphTraits if you don't need to override everything.
164///
165template <typename Ty>
166struct DOTGraphTraits : public DefaultDOTGraphTraits {
167 DOTGraphTraits (bool simple=false) : DefaultDOTGraphTraits (simple) {}
168};
169
170} // End llvm namespace
171
172#endif
173

source code of llvm/include/llvm/Support/DOTGraphTraits.h