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//===-- Support/GraphWriter.h - Write a graph to a .dot file ---*- C++ -*--===//
//
// This file defines a simple interface that can be used to print out generic
// LLVM graphs to ".dot" files. "dot" is a tool that is part of the AT&T
// graphviz package (http://www.research.att.com/sw/tools/graphviz/) which can
// be used to turn the files output by this interface into a variety of
// different graphics formats.
//
// Graphs do not need to implement any interface past what is already required
// by the GraphTraits template, but they can choose to implement specializations
// of the DOTGraphTraits template if they want to customize the graphs output in
// any way.
//
//===----------------------------------------------------------------------===//
#ifndef SUPPORT_GRAPHWRITER_H
#define SUPPORT_GRAPHWRITER_H
#include "Support/DOTGraphTraits.h"
#include "Support/DepthFirstIterator.h"
#include <ostream>
namespace DOT { // Private functions...
inline std::string EscapeString(const std::string &Label) {
std::string Str(Label);
for (unsigned i = 0; i != Str.length(); ++i)
switch (Str[i]) {
case '\n':
Str.insert(Str.begin()+i, '\\'); // Escape character...
++i;
Str[i] = 'n';
break;
case '\t':
Str.insert(Str.begin()+i, ' '); // Convert to two spaces
++i;
Str[i] = ' ';
break;
case '\\':
if (i+1 != Str.length() && Str[i+1] == 'l')
break; // don't disturb \l
case '{': case '}':
case '<': case '>':
Str.insert(Str.begin()+i, '\\'); // Escape character...
++i; // don't infinite loop
break;
}
return Str;
}
}
template<typename GraphType>
std::ostream &WriteGraph(std::ostream &O, const GraphType &G) {
typedef DOTGraphTraits<GraphType> DOTTraits;
typedef GraphTraits<GraphType> GTraits;
typedef typename GTraits::NodeType NodeType;
O << "digraph foo {\n" // Graph name doesn't matter
<< "\tsize=\"10,7.5\";\n" // Size to fit on a page
<< "\trotate=\"90\";\n"; // Orient correctly
std::string GraphName = DOTTraits::getGraphName(G);
if (!GraphName.empty())
O << "\tlabel=\"" << DOT::EscapeString(GraphName) << "\";\n";
O << "\n";
// Loop over the graph in DFO, printing it out...
NodeType *Root = GTraits::getEntryNode(G);
for (df_iterator<GraphType> I = df_begin(G), E = df_end(G); I != E; ++I) {
NodeType *Node = *I;
std::string NodeAttributes = DOTTraits::getNodeAttributes(Node);
O << "\tNode" << (void*)Node << " [";
if (!NodeAttributes.empty()) O << NodeAttributes << ",";
O << "shape=record,label=\"{"
<< DOT::EscapeString(DOTTraits::getNodeLabel(Node, G));
// Print out the fields of the current node...
typename GTraits::ChildIteratorType EI = GTraits::child_begin(Node);
typename GTraits::ChildIteratorType EE = GTraits::child_end(Node);
if (EI != EE) {
O << "|{";
for (unsigned i = 0; EI != EE && i != 64; ++EI, ++i) {
if (i) O << "|";
O << "<g" << i << ">" << DOTTraits::getEdgeSourceLabel(Node, EI);
}
if (EI != EE)
O << "|truncated...";
O << "}";
}
O << "}\"];\n"; // Finish printing the "node" line
// Output all of the edges now
EI = GTraits::child_begin(Node);
for (unsigned i = 0; EI != EE && i != 64; ++EI, ++i) {
NodeType *TargetNode = *EI;
O << "\tNode" << (void*)Node << ":g" << i << " -> Node"
<< (void*)TargetNode;
if (DOTTraits::edgeTargetsEdgeSource(Node, EI)) {
typename GTraits::ChildIteratorType TargetIt =
DOTTraits::getEdgeTarget(Node, EI);
// Figure out which edge this targets...
unsigned Offset = std::distance(GTraits::child_begin(TargetNode),
TargetIt);
if (Offset > 64) Offset = 64; // Targetting the trancated part?
O << ":g" << Offset;
}
std::string EdgeAttributes = DOTTraits::getEdgeAttributes(Node, EI);
if (!EdgeAttributes.empty())
O << "[" << EdgeAttributes << "]";
O << ";\n";
}
}
// Finish off the graph
O << "}\n";
return O;
}
#endif
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