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GraphWriter.h

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00001 //===-- llvm/Support/GraphWriter.h - Write graph to a .dot file -*- C++ -*-===//
00002 // 
00003 //                     The LLVM Compiler Infrastructure
00004 //
00005 // This file was developed by the LLVM research group and is distributed under
00006 // the University of Illinois Open Source License. See LICENSE.TXT for details.
00007 // 
00008 //===----------------------------------------------------------------------===//
00009 //
00010 // This file defines a simple interface that can be used to print out generic
00011 // LLVM graphs to ".dot" files.  "dot" is a tool that is part of the AT&T
00012 // graphviz package (http://www.research.att.com/sw/tools/graphviz/) which can
00013 // be used to turn the files output by this interface into a variety of
00014 // different graphics formats.
00015 //
00016 // Graphs do not need to implement any interface past what is already required
00017 // by the GraphTraits template, but they can choose to implement specializations
00018 // of the DOTGraphTraits template if they want to customize the graphs output in
00019 // any way.
00020 //
00021 //===----------------------------------------------------------------------===//
00022 
00023 #ifndef LLVM_SUPPORT_GRAPHWRITER_H
00024 #define LLVM_SUPPORT_GRAPHWRITER_H
00025 
00026 #include "llvm/Support/DOTGraphTraits.h"
00027 #include "llvm/ADT/GraphTraits.h"
00028 #include <vector>
00029 #include <iostream>
00030 
00031 namespace llvm {
00032 
00033 namespace DOT {  // Private functions...
00034   inline std::string EscapeString(const std::string &Label) {
00035     std::string Str(Label);
00036     for (unsigned i = 0; i != Str.length(); ++i)
00037       switch (Str[i]) {
00038       case '\n':
00039         Str.insert(Str.begin()+i, '\\');  // Escape character...
00040         ++i;
00041         Str[i] = 'n';
00042         break;
00043       case '\t':
00044         Str.insert(Str.begin()+i, ' ');  // Convert to two spaces
00045         ++i;
00046         Str[i] = ' ';
00047         break;
00048       case '\\':
00049         if (i+1 != Str.length() && Str[i+1] == 'l')
00050           break;  // don't disturb \l
00051       case '{': case '}':
00052       case '<': case '>':
00053       case '"':
00054         Str.insert(Str.begin()+i, '\\');  // Escape character...
00055         ++i;  // don't infinite loop
00056         break;
00057       }
00058     return Str;
00059   }
00060 }
00061 
00062 template<typename GraphType>
00063 class GraphWriter {
00064   std::ostream &O;
00065   const GraphType &G;
00066 
00067   typedef DOTGraphTraits<GraphType>           DOTTraits;
00068   typedef GraphTraits<GraphType>              GTraits;
00069   typedef typename GTraits::NodeType          NodeType;
00070   typedef typename GTraits::nodes_iterator    node_iterator;
00071   typedef typename GTraits::ChildIteratorType child_iterator;
00072 public:
00073   GraphWriter(std::ostream &o, const GraphType &g) : O(o), G(g) {}
00074 
00075   void writeHeader(const std::string &Name) {
00076     if (Name.empty())
00077       O << "digraph foo {\n";        // Graph name doesn't matter
00078     else
00079       O << "digraph " << Name << " {\n";
00080 
00081     std::string GraphName = DOTTraits::getGraphName(G);
00082     if (!GraphName.empty())
00083       O << "\tlabel=\"" << DOT::EscapeString(GraphName) << "\";\n";
00084     O << DOTTraits::getGraphProperties(G);
00085     O << "\n";
00086   }
00087 
00088   void writeFooter() {
00089     // Finish off the graph
00090     O << "}\n";
00091   }
00092 
00093   void writeNodes() {
00094     // Loop over the graph, printing it out...
00095     for (node_iterator I = GTraits::nodes_begin(G), E = GTraits::nodes_end(G);
00096          I != E; ++I)
00097       writeNode(&*I);
00098   }
00099 
00100   void writeNode(NodeType *Node) {
00101     std::string NodeAttributes = DOTTraits::getNodeAttributes(Node);
00102       
00103     O << "\tNode" << reinterpret_cast<const void*>(Node) << " [shape=record,";
00104     if (!NodeAttributes.empty()) O << NodeAttributes << ",";
00105     O << "label=\"{"
00106       << DOT::EscapeString(DOTTraits::getNodeLabel(Node, G));
00107     
00108     // Print out the fields of the current node...
00109     child_iterator EI = GTraits::child_begin(Node);
00110     child_iterator EE = GTraits::child_end(Node);
00111     if (EI != EE) {
00112       O << "|{";
00113       
00114       for (unsigned i = 0; EI != EE && i != 64; ++EI, ++i) {
00115         if (i) O << "|";
00116         O << "<g" << i << ">" << DOTTraits::getEdgeSourceLabel(Node, EI);
00117       }
00118       
00119       if (EI != EE)
00120         O << "|<g64>truncated...";
00121       O << "}";
00122     }
00123     O << "}\"];\n";   // Finish printing the "node" line
00124     
00125     // Output all of the edges now
00126     EI = GTraits::child_begin(Node);
00127     for (unsigned i = 0; EI != EE && i != 64; ++EI, ++i)
00128       writeEdge(Node, i, EI);
00129     for (; EI != EE; ++EI)
00130       writeEdge(Node, 64, EI);
00131   }
00132 
00133   void writeEdge(NodeType *Node, unsigned edgeidx, child_iterator EI) {
00134     if (NodeType *TargetNode = *EI) {
00135       int DestPort = -1;
00136       if (DOTTraits::edgeTargetsEdgeSource(Node, EI)) {
00137         child_iterator TargetIt = DOTTraits::getEdgeTarget(Node, EI);
00138 
00139         // Figure out which edge this targets...
00140         unsigned Offset = std::distance(GTraits::child_begin(TargetNode),
00141                                         TargetIt);
00142         DestPort = static_cast<int>(Offset);
00143       }
00144 
00145       emitEdge(reinterpret_cast<const void*>(Node), edgeidx,
00146                reinterpret_cast<const void*>(TargetNode), DestPort,
00147                DOTTraits::getEdgeAttributes(Node, EI));
00148     }
00149   }
00150 
00151   /// emitSimpleNode - Outputs a simple (non-record) node
00152   void emitSimpleNode(const void *ID, const std::string &Attr,
00153                       const std::string &Label, unsigned NumEdgeSources = 0,
00154                       const std::vector<std::string> *EdgeSourceLabels = 0) {
00155     O << "\tNode" << ID << "[ ";
00156     if (!Attr.empty())
00157       O << Attr << ",";
00158     O << " label =\"";
00159     if (NumEdgeSources) O << "{";
00160     O << DOT::EscapeString(Label);
00161     if (NumEdgeSources) {
00162       O << "|{";
00163       
00164       for (unsigned i = 0; i != NumEdgeSources; ++i) {
00165         if (i) O << "|";
00166         O << "<g" << i << ">";
00167         if (EdgeSourceLabels) O << (*EdgeSourceLabels)[i];
00168       }
00169       O << "}}";
00170     }
00171     O << "\"];\n";
00172   }
00173 
00174   /// emitEdge - Output an edge from a simple node into the graph...
00175   void emitEdge(const void *SrcNodeID, int SrcNodePort,
00176                 const void *DestNodeID, int DestNodePort,
00177                 const std::string &Attrs) {
00178     if (SrcNodePort  > 64) return;             // Eminating from truncated part?
00179     if (DestNodePort > 64) DestNodePort = 64;  // Targetting the truncated part?
00180 
00181     O << "\tNode" << SrcNodeID;
00182     if (SrcNodePort >= 0)
00183       O << ":g" << SrcNodePort;
00184     O << " -> Node" << reinterpret_cast<const void*>(DestNodeID);
00185     if (DestNodePort >= 0)
00186       O << ":g" << DestNodePort;    
00187 
00188     if (!Attrs.empty())
00189       O << "[" << Attrs << "]";
00190     O << ";\n";
00191   }
00192 };
00193 
00194 template<typename GraphType>
00195 std::ostream &WriteGraph(std::ostream &O, const GraphType &G,
00196                          const std::string &Name = "") {
00197   // Start the graph emission process...
00198   GraphWriter<GraphType> W(O, G);
00199 
00200   // Output the header for the graph...
00201   W.writeHeader(Name);
00202 
00203   // Emit all of the nodes in the graph...
00204   W.writeNodes();
00205 
00206   // Output any customizations on the graph
00207   DOTGraphTraits<GraphType>::addCustomGraphFeatures(G, W);
00208 
00209   // Output the end of the graph
00210   W.writeFooter();
00211   return O;
00212 }
00213 
00214 } // End llvm namespace
00215 
00216 #endif