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1 //===- CallPrinter.cpp - DOT printer for call graph -----------------------===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8 //
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9 // This file defines '-dot-callgraph', which emit a callgraph.<fnname>.dot
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10 // containing the call graph of a module.
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11 //
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12 // There is also a pass available to directly call dotty ('-view-callgraph').
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13 //
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14 //===----------------------------------------------------------------------===//
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15
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16 #include "llvm/Analysis/CallPrinter.h"
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17 #include "llvm/Analysis/CallGraph.h"
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18 #include "llvm/Analysis/DOTGraphTraitsPass.h"
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19 #include "llvm/InitializePasses.h"
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20
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21 using namespace llvm;
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22
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23 namespace llvm {
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24
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25 template <> struct DOTGraphTraits<CallGraph *> : public DefaultDOTGraphTraits {
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26 DOTGraphTraits(bool isSimple = false) : DefaultDOTGraphTraits(isSimple) {}
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27
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28 static std::string getGraphName(CallGraph *Graph) { return "Call graph"; }
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29
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30 std::string getNodeLabel(CallGraphNode *Node, CallGraph *Graph) {
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31 if (Function *Func = Node->getFunction())
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32 return std::string(Func->getName());
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33
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34 return "external node";
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35 }
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36 };
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37
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38 struct AnalysisCallGraphWrapperPassTraits {
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39 static CallGraph *getGraph(CallGraphWrapperPass *P) {
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40 return &P->getCallGraph();
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41 }
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42 };
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43
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44 } // end llvm namespace
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45
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46 namespace {
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47
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48 struct CallGraphViewer
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49 : public DOTGraphTraitsModuleViewer<CallGraphWrapperPass, true, CallGraph *,
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50 AnalysisCallGraphWrapperPassTraits> {
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51 static char ID;
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52
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53 CallGraphViewer()
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54 : DOTGraphTraitsModuleViewer<CallGraphWrapperPass, true, CallGraph *,
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55 AnalysisCallGraphWrapperPassTraits>(
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56 "callgraph", ID) {
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57 initializeCallGraphViewerPass(*PassRegistry::getPassRegistry());
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58 }
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59 };
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60
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61 struct CallGraphDOTPrinter : public DOTGraphTraitsModulePrinter<
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62 CallGraphWrapperPass, true, CallGraph *,
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63 AnalysisCallGraphWrapperPassTraits> {
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64 static char ID;
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65
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66 CallGraphDOTPrinter()
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67 : DOTGraphTraitsModulePrinter<CallGraphWrapperPass, true, CallGraph *,
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68 AnalysisCallGraphWrapperPassTraits>(
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69 "callgraph", ID) {
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70 initializeCallGraphDOTPrinterPass(*PassRegistry::getPassRegistry());
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71 }
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72 };
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73
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74 } // end anonymous namespace
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75
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76 char CallGraphViewer::ID = 0;
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77 INITIALIZE_PASS(CallGraphViewer, "view-callgraph", "View call graph", false,
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78 false)
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79
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80 char CallGraphDOTPrinter::ID = 0;
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81 INITIALIZE_PASS(CallGraphDOTPrinter, "dot-callgraph",
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82 "Print call graph to 'dot' file", false, false)
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83
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84 // Create methods available outside of this file, to use them
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85 // "include/llvm/LinkAllPasses.h". Otherwise the pass would be deleted by
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86 // the link time optimization.
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87
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88 ModulePass *llvm::createCallGraphViewerPass() { return new CallGraphViewer(); }
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89
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90 ModulePass *llvm::createCallGraphDOTPrinterPass() {
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91 return new CallGraphDOTPrinter();
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92 }
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