text: //===- CallPrinter.cpp - DOT printer for call graph -----------------------===//
  //
  // 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 '-dot-callgraph', which emit a callgraph.<fnname>.dot
  // containing the call graph of a module.
  //
  // There is also a pass available to directly call dotty ('-view-callgraph').
  //
  //===----------------------------------------------------------------------===//
  
  #include "llvm/Analysis/CallPrinter.h"
  #include "llvm/Analysis/CallGraph.h"
  #include "llvm/Analysis/DOTGraphTraitsPass.h"
  
  using namespace llvm;
  
  namespace llvm {
  
  template <> struct DOTGraphTraits<CallGraph *> : public DefaultDOTGraphTraits {
    DOTGraphTraits(bool isSimple = false) : DefaultDOTGraphTraits(isSimple) {}
  
    static std::string getGraphName(CallGraph *Graph) { return "Call graph"; }
  
    std::string getNodeLabel(CallGraphNode *Node, CallGraph *Graph) {
      if (Function *Func = Node->getFunction())
        return Func->getName();
  
      return "external node";
    }
  };
  
  struct AnalysisCallGraphWrapperPassTraits {
    static CallGraph *getGraph(CallGraphWrapperPass *P) {
      return &P->getCallGraph();
    }
  };
  
  } // end llvm namespace
  
  namespace {
  
  struct CallGraphViewer
      : public DOTGraphTraitsModuleViewer<CallGraphWrapperPass, true, CallGraph *,
                                          AnalysisCallGraphWrapperPassTraits> {
    static char ID;
  
    CallGraphViewer()
        : DOTGraphTraitsModuleViewer<CallGraphWrapperPass, true, CallGraph *,
                                     AnalysisCallGraphWrapperPassTraits>(
              "callgraph", ID) {
      initializeCallGraphViewerPass(*PassRegistry::getPassRegistry());
    }
  };
  
  struct CallGraphDOTPrinter : public DOTGraphTraitsModulePrinter<
                                CallGraphWrapperPass, true, CallGraph *,
                                AnalysisCallGraphWrapperPassTraits> {
    static char ID;
  
    CallGraphDOTPrinter()
        : DOTGraphTraitsModulePrinter<CallGraphWrapperPass, true, CallGraph *,
                                      AnalysisCallGraphWrapperPassTraits>(
              "callgraph", ID) {
      initializeCallGraphDOTPrinterPass(*PassRegistry::getPassRegistry());
    }
  };
  
  } // end anonymous namespace
  
  char CallGraphViewer::ID = 0;
  INITIALIZE_PASS(CallGraphViewer, "view-callgraph", "View call graph", false,
                  false)
  
  char CallGraphDOTPrinter::ID = 0;
  INITIALIZE_PASS(CallGraphDOTPrinter, "dot-callgraph",
                  "Print call graph to 'dot' file", false, false)
  
  // Create methods available outside of this file, to use them
  // "include/llvm/LinkAllPasses.h". Otherwise the pass would be deleted by
  // the link time optimization.
  
  ModulePass *llvm::createCallGraphViewerPass() { return new CallGraphViewer(); }
  
  ModulePass *llvm::createCallGraphDOTPrinterPass() {
    return new CallGraphDOTPrinter();
  }
  