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//===- llvm/Support/GraphWriter.h - Write graph to a .dot file --*- 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 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 LLVM_SUPPORT_GRAPHWRITER_H
#define LLVM_SUPPORT_GRAPHWRITER_H
#include "llvm/ADT/GraphTraits.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/Twine.h"
#include "llvm/Support/DOTGraphTraits.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/raw_ostream.h"
#include <iterator>
#include <string>
#include <type_traits>
#include <vector>
namespace llvm {
namespace DOT { // Private functions...
std::string EscapeString(const std::string &Label);
/// Get a color string for this node number. Simply round-robin selects
/// from a reasonable number of colors.
StringRef getColorString(unsigned NodeNumber);
} // end namespace DOT
namespace GraphProgram {
enum Name {
DOT,
FDP,
NEATO,
TWOPI,
CIRCO
};
} // end namespace GraphProgram
bool DisplayGraph(StringRef Filename, bool wait = true,
GraphProgram::Name program = GraphProgram::DOT);
template<typename GraphType>
class GraphWriter {
raw_ostream &O;
const GraphType &G;
bool RenderUsingHTML = false;
using DOTTraits = DOTGraphTraits<GraphType>;
using GTraits = GraphTraits<GraphType>;
using NodeRef = typename GTraits::NodeRef;
using node_iterator = typename GTraits::nodes_iterator;
using child_iterator = typename GTraits::ChildIteratorType;
DOTTraits DTraits;
static_assert(std::is_pointer_v<NodeRef>,
"FIXME: Currently GraphWriter requires the NodeRef type to be "
"a pointer.\nThe pointer usage should be moved to "
"DOTGraphTraits, and removed from GraphWriter itself.");
// Writes the edge labels of the node to O and returns true if there are any
// edge labels not equal to the empty string "".
bool getEdgeSourceLabels(raw_ostream &O, NodeRef Node) {
child_iterator EI = GTraits::child_begin(Node);
child_iterator EE = GTraits::child_end(Node);
bool hasEdgeSourceLabels = false;
if (RenderUsingHTML)
O << "</tr><tr>";
for (unsigned i = 0; EI != EE && i != 64; ++EI, ++i) {
std::string label = DTraits.getEdgeSourceLabel(Node, EI);
if (label.empty())
continue;
hasEdgeSourceLabels = true;
if (RenderUsingHTML)
O << "<td colspan=\"1\" port=\"s" << i << "\">" << label << "</td>";
else {
if (i)
O << "|";
O << "<s" << i << ">" << DOT::EscapeString(label);
}
}
if (EI != EE && hasEdgeSourceLabels) {
if (RenderUsingHTML)
O << "<td colspan=\"1\" port=\"s64\">truncated...</td>";
else
O << "|<s64>truncated...";
}
return hasEdgeSourceLabels;
}
public:
GraphWriter(raw_ostream &o, const GraphType &g, bool SN) : O(o), G(g) {
DTraits = DOTTraits(SN);
RenderUsingHTML = DTraits.renderNodesUsingHTML();
}
void writeGraph(const std::string &Title = "") {
// Output the header for the graph...
writeHeader(Title);
// Emit all of the nodes in the graph...
writeNodes();
// Output any customizations on the graph
DOTGraphTraits<GraphType>::addCustomGraphFeatures(G, *this);
// Output the end of the graph
writeFooter();
}
void writeHeader(const std::string &Title) {
std::string GraphName(DTraits.getGraphName(G));
if (!Title.empty())
O << "digraph \"" << DOT::EscapeString(Title) << "\" {\n";
else if (!GraphName.empty())
O << "digraph \"" << DOT::EscapeString(GraphName) << "\" {\n";
else
O << "digraph unnamed {\n";
if (DTraits.renderGraphFromBottomUp())
O << "\trankdir=\"BT\";\n";
if (!Title.empty())
O << "\tlabel=\"" << DOT::EscapeString(Title) << "\";\n";
else if (!GraphName.empty())
O << "\tlabel=\"" << DOT::EscapeString(GraphName) << "\";\n";
O << DTraits.getGraphProperties(G);
O << "\n";
}
void writeFooter() {
// Finish off the graph
O << "}\n";
}
void writeNodes() {
// Loop over the graph, printing it out...
for (const auto Node : nodes<GraphType>(G))
if (!isNodeHidden(Node))
writeNode(Node);
}
bool isNodeHidden(NodeRef Node) { return DTraits.isNodeHidden(Node, G); }
void writeNode(NodeRef Node) {
std::string NodeAttributes = DTraits.getNodeAttributes(Node, G);
O << "\tNode" << static_cast<const void *>(Node) << " [shape=";
if (RenderUsingHTML)
O << "none,";
else
O << "record,";
if (!NodeAttributes.empty()) O << NodeAttributes << ",";
O << "label=";
if (RenderUsingHTML) {
// Count the numbewr of edges out of the node to determine how
// many columns to span (max 64)
unsigned ColSpan = 0;
child_iterator EI = GTraits::child_begin(Node);
child_iterator EE = GTraits::child_end(Node);
for (; EI != EE && ColSpan != 64; ++EI, ++ColSpan)
;
if (ColSpan == 0)
ColSpan = 1;
// Include truncated messages when counting.
if (EI != EE)
++ColSpan;
O << "<<table border=\"0\" cellborder=\"1\" cellspacing=\"0\""
<< " cellpadding=\"0\"><tr><td align=\"text\" colspan=\"" << ColSpan
<< "\">";
} else
O << "\"{";
if (!DTraits.renderGraphFromBottomUp()) {
if (RenderUsingHTML)
O << DTraits.getNodeLabel(Node, G) << "</td>";
else
O << DOT::EscapeString(DTraits.getNodeLabel(Node, G));
// If we should include the address of the node in the label, do so now.
std::string Id = DTraits.getNodeIdentifierLabel(Node, G);
if (!Id.empty())
O << "|" << DOT::EscapeString(Id);
std::string NodeDesc = DTraits.getNodeDescription(Node, G);
if (!NodeDesc.empty())
O << "|" << DOT::EscapeString(NodeDesc);
}
std::string edgeSourceLabels;
raw_string_ostream EdgeSourceLabels(edgeSourceLabels);
bool hasEdgeSourceLabels = getEdgeSourceLabels(EdgeSourceLabels, Node);
if (hasEdgeSourceLabels) {
if (!DTraits.renderGraphFromBottomUp())
if (!RenderUsingHTML)
O << "|";
if (RenderUsingHTML)
O << edgeSourceLabels;
else
O << "{" << edgeSourceLabels << "}";
if (DTraits.renderGraphFromBottomUp())
if (!RenderUsingHTML)
O << "|";
}
if (DTraits.renderGraphFromBottomUp()) {
if (RenderUsingHTML)
O << DTraits.getNodeLabel(Node, G);
else
O << DOT::EscapeString(DTraits.getNodeLabel(Node, G));
// If we should include the address of the node in the label, do so now.
std::string Id = DTraits.getNodeIdentifierLabel(Node, G);
if (!Id.empty())
O << "|" << DOT::EscapeString(Id);
std::string NodeDesc = DTraits.getNodeDescription(Node, G);
if (!NodeDesc.empty())
O << "|" << DOT::EscapeString(NodeDesc);
}
if (DTraits.hasEdgeDestLabels()) {
O << "|{";
unsigned i = 0, e = DTraits.numEdgeDestLabels(Node);
for (; i != e && i != 64; ++i) {
if (i) O << "|";
O << "<d" << i << ">"
<< DOT::EscapeString(DTraits.getEdgeDestLabel(Node, i));
}
if (i != e)
O << "|<d64>truncated...";
O << "}";
}
if (RenderUsingHTML)
O << "</tr></table>>";
else
O << "}\"";
O << "];\n"; // Finish printing the "node" line
// Output all of the edges now
child_iterator EI = GTraits::child_begin(Node);
child_iterator EE = GTraits::child_end(Node);
for (unsigned i = 0; EI != EE && i != 64; ++EI, ++i)
if (!DTraits.isNodeHidden(*EI, G))
writeEdge(Node, i, EI);
for (; EI != EE; ++EI)
if (!DTraits.isNodeHidden(*EI, G))
writeEdge(Node, 64, EI);
}
void writeEdge(NodeRef Node, unsigned edgeidx, child_iterator EI) {
if (NodeRef TargetNode = *EI) {
int DestPort = -1;
if (DTraits.edgeTargetsEdgeSource(Node, EI)) {
child_iterator TargetIt = DTraits.getEdgeTarget(Node, EI);
// Figure out which edge this targets...
unsigned Offset =
(unsigned)std::distance(GTraits::child_begin(TargetNode), TargetIt);
DestPort = static_cast<int>(Offset);
}
if (DTraits.getEdgeSourceLabel(Node, EI).empty())
edgeidx = -1;
emitEdge(static_cast<const void*>(Node), edgeidx,
static_cast<const void*>(TargetNode), DestPort,
DTraits.getEdgeAttributes(Node, EI, G));
}
}
/// emitSimpleNode - Outputs a simple (non-record) node
void emitSimpleNode(const void *ID, const std::string &Attr,
const std::string &Label, unsigned NumEdgeSources = 0,
const std::vector<std::string> *EdgeSourceLabels = nullptr) {
O << "\tNode" << ID << "[ ";
if (!Attr.empty())
O << Attr << ",";
O << " label =\"";
if (NumEdgeSources) O << "{";
O << DOT::EscapeString(Label);
if (NumEdgeSources) {
O << "|{";
for (unsigned i = 0; i != NumEdgeSources; ++i) {
if (i) O << "|";
O << "<s" << i << ">";
if (EdgeSourceLabels) O << DOT::EscapeString((*EdgeSourceLabels)[i]);
}
O << "}}";
}
O << "\"];\n";
}
/// emitEdge - Output an edge from a simple node into the graph...
void emitEdge(const void *SrcNodeID, int SrcNodePort,
const void *DestNodeID, int DestNodePort,
const std::string &Attrs) {
if (SrcNodePort > 64) return; // Eminating from truncated part?
if (DestNodePort > 64) DestNodePort = 64; // Targeting the truncated part?
O << "\tNode" << SrcNodeID;
if (SrcNodePort >= 0)
O << ":s" << SrcNodePort;
O << " -> Node" << DestNodeID;
if (DestNodePort >= 0 && DTraits.hasEdgeDestLabels())
O << ":d" << DestNodePort;
if (!Attrs.empty())
O << "[" << Attrs << "]";
O << ";\n";
}
/// getOStream - Get the raw output stream into the graph file. Useful to
/// write fancy things using addCustomGraphFeatures().
raw_ostream &getOStream() {
return O;
}
};
template<typename GraphType>
raw_ostream &WriteGraph(raw_ostream &O, const GraphType &G,
bool ShortNames = false,
const Twine &Title = "") {
// Start the graph emission process...
GraphWriter<GraphType> W(O, G, ShortNames);
// Emit the graph.
W.writeGraph(Title.str());
return O;
}
std::string createGraphFilename(const Twine &Name, int &FD);
/// Writes graph into a provided @c Filename.
/// If @c Filename is empty, generates a random one.
/// \return The resulting filename, or an empty string if writing
/// failed.
template <typename GraphType>
std::string WriteGraph(const GraphType &G, const Twine &Name,
bool ShortNames = false,
const Twine &Title = "",
std::string Filename = "") {
int FD;
if (Filename.empty()) {
Filename = createGraphFilename(Name.str(), FD);
} else {
std::error_code EC = sys::fs::openFileForWrite(
Filename, FD, sys::fs::CD_CreateAlways, sys::fs::OF_Text);
// Writing over an existing file is not considered an error.
if (EC == std::errc::file_exists) {
errs() << "file exists, overwriting" << "\n";
} else if (EC) {
errs() << "error writing into file" << "\n";
return "";
} else {
errs() << "writing to the newly created file " << Filename << "\n";
}
}
raw_fd_ostream O(FD, /*shouldClose=*/ true);
if (FD == -1) {
errs() << "error opening file '" << Filename << "' for writing!\n";
return "";
}
llvm::WriteGraph(O, G, ShortNames, Title);
errs() << " done. \n";
return Filename;
}
/// DumpDotGraph - Just dump a dot graph to the user-provided file name.
#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
template <typename GraphType>
LLVM_DUMP_METHOD void
dumpDotGraphToFile(const GraphType &G, const Twine &FileName,
const Twine &Title, bool ShortNames = false,
const Twine &Name = "") {
llvm::WriteGraph(G, Name, ShortNames, Title, FileName.str());
}
#endif
/// ViewGraph - Emit a dot graph, run 'dot', run gv on the postscript file,
/// then cleanup. For use from the debugger.
///
template<typename GraphType>
void ViewGraph(const GraphType &G, const Twine &Name,
bool ShortNames = false, const Twine &Title = "",
GraphProgram::Name Program = GraphProgram::DOT) {
std::string Filename = llvm::WriteGraph(G, Name, ShortNames, Title);
if (Filename.empty())
return;
DisplayGraph(Filename, false, Program);
}
} // end namespace llvm
#endif // LLVM_SUPPORT_GRAPHWRITER_H
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