1//===- CallPrinter.cpp - DOT printer for call graph -----------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file defines '-dot-callgraph', which emit a callgraph.<fnname>.dot
11// containing the call graph of a module.
12//
13// There is also a pass available to directly call dotty ('-view-callgraph').
14//
15//===----------------------------------------------------------------------===//
16
17#include "llvm/Analysis/CallGraph.h"
18#include "llvm/Analysis/CallPrinter.h"
19#include "llvm/Analysis/DOTGraphTraitsPass.h"
20
21using namespace llvm;
22
23namespace llvm {
24
25template <> struct DOTGraphTraits<CallGraph *> : public DefaultDOTGraphTraits {
26  DOTGraphTraits(bool isSimple = false) : DefaultDOTGraphTraits(isSimple) {}
27
28  static std::string getGraphName(CallGraph *Graph) { return "Call graph"; }
29
30  std::string getNodeLabel(CallGraphNode *Node, CallGraph *Graph) {
31    if (Function *Func = Node->getFunction())
32      return Func->getName();
33
34    return "external node";
35  }
36};
37
38struct AnalysisCallGraphWrapperPassTraits {
39  static CallGraph *getGraph(CallGraphWrapperPass *P) {
40    return &P->getCallGraph();
41  }
42};
43
44} // end llvm namespace
45
46namespace {
47
48struct CallGraphViewer
49    : public DOTGraphTraitsModuleViewer<CallGraphWrapperPass, true, CallGraph *,
50                                        AnalysisCallGraphWrapperPassTraits> {
51  static char ID;
52
53  CallGraphViewer()
54      : DOTGraphTraitsModuleViewer<CallGraphWrapperPass, true, CallGraph *,
55                                   AnalysisCallGraphWrapperPassTraits>(
56            "callgraph", ID) {
57    initializeCallGraphViewerPass(*PassRegistry::getPassRegistry());
58  }
59};
60
61struct CallGraphPrinter : public DOTGraphTraitsModulePrinter<
62                              CallGraphWrapperPass, true, CallGraph *,
63                              AnalysisCallGraphWrapperPassTraits> {
64  static char ID;
65
66  CallGraphPrinter()
67      : DOTGraphTraitsModulePrinter<CallGraphWrapperPass, true, CallGraph *,
68                                    AnalysisCallGraphWrapperPassTraits>(
69            "callgraph", ID) {
70    initializeCallGraphPrinterPass(*PassRegistry::getPassRegistry());
71  }
72};
73
74} // end anonymous namespace
75
76char CallGraphViewer::ID = 0;
77INITIALIZE_PASS(CallGraphViewer, "view-callgraph", "View call graph", false,
78                false)
79
80char CallGraphPrinter::ID = 0;
81INITIALIZE_PASS(CallGraphPrinter, "dot-callgraph",
82                "Print call graph to 'dot' file", false, false)
83
84// Create methods available outside of this file, to use them
85// "include/llvm/LinkAllPasses.h". Otherwise the pass would be deleted by
86// the link time optimization.
87
88ModulePass *llvm::createCallGraphViewerPass() { return new CallGraphViewer(); }
89
90ModulePass *llvm::createCallGraphPrinterPass() {
91  return new CallGraphPrinter();
92}
93