1 //===-- DOTGraphTraitsPass.h - Print/View dotty graphs-----------*- C++ -*-===//
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 // Templates to create dotty viewer and printer passes for GraphTraits graphs.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #ifndef LLVM_ANALYSIS_DOTGRAPHTRAITSPASS_H
15 #define LLVM_ANALYSIS_DOTGRAPHTRAITSPASS_H
16 
17 #include "llvm/Analysis/CFGPrinter.h"
18 #include "llvm/Pass.h"
19 #include "llvm/Support/FileSystem.h"
20 
21 namespace llvm {
22 
23 /// Default traits class for extracting a graph from an analysis pass.
24 ///
25 /// This assumes that 'GraphT' is 'AnalysisT *' and so just passes it through.
26 template <typename AnalysisT, typename GraphT = AnalysisT *>
27 struct DefaultAnalysisGraphTraits {
getGraphDefaultAnalysisGraphTraits28   static GraphT getGraph(AnalysisT *A) { return A; }
29 };
30 
31 template <
32     typename AnalysisT, bool IsSimple, typename GraphT = AnalysisT *,
33     typename AnalysisGraphTraitsT = DefaultAnalysisGraphTraits<AnalysisT, GraphT> >
34 class DOTGraphTraitsViewer : public FunctionPass {
35 public:
DOTGraphTraitsViewer(StringRef GraphName,char & ID)36   DOTGraphTraitsViewer(StringRef GraphName, char &ID)
37       : FunctionPass(ID), Name(GraphName) {}
38 
39   /// Return true if this function should be processed.
40   ///
41   /// An implementation of this class my override this function to indicate that
42   /// only certain functions should be viewed.
43   ///
44   /// @param Analysis The current analysis result for this function.
processFunction(Function & F,AnalysisT & Analysis)45   virtual bool processFunction(Function &F, AnalysisT &Analysis) {
46     return true;
47   }
48 
runOnFunction(Function & F)49   bool runOnFunction(Function &F) override {
50     auto &Analysis = getAnalysis<AnalysisT>();
51 
52     if (!processFunction(F, Analysis))
53       return false;
54 
55     GraphT Graph = AnalysisGraphTraitsT::getGraph(&Analysis);
56     std::string GraphName = DOTGraphTraits<GraphT>::getGraphName(Graph);
57     std::string Title = GraphName + " for '" + F.getName().str() + "' function";
58 
59     ViewGraph(Graph, Name, IsSimple, Title);
60 
61     return false;
62   }
63 
getAnalysisUsage(AnalysisUsage & AU)64   void getAnalysisUsage(AnalysisUsage &AU) const override {
65     AU.setPreservesAll();
66     AU.addRequired<AnalysisT>();
67   }
68 
69 private:
70   std::string Name;
71 };
72 
73 template <
74     typename AnalysisT, bool IsSimple, typename GraphT = AnalysisT *,
75     typename AnalysisGraphTraitsT = DefaultAnalysisGraphTraits<AnalysisT, GraphT> >
76 class DOTGraphTraitsPrinter : public FunctionPass {
77 public:
DOTGraphTraitsPrinter(StringRef GraphName,char & ID)78   DOTGraphTraitsPrinter(StringRef GraphName, char &ID)
79       : FunctionPass(ID), Name(GraphName) {}
80 
81   /// Return true if this function should be processed.
82   ///
83   /// An implementation of this class my override this function to indicate that
84   /// only certain functions should be printed.
85   ///
86   /// @param Analysis The current analysis result for this function.
processFunction(Function & F,AnalysisT & Analysis)87   virtual bool processFunction(Function &F, AnalysisT &Analysis) {
88     return true;
89   }
90 
runOnFunction(Function & F)91   bool runOnFunction(Function &F) override {
92     auto &Analysis = getAnalysis<AnalysisT>();
93 
94     if (!processFunction(F, Analysis))
95       return false;
96 
97     GraphT Graph = AnalysisGraphTraitsT::getGraph(&Analysis);
98     std::string Filename = Name + "." + F.getName().str() + ".dot";
99     std::error_code EC;
100 
101     errs() << "Writing '" << Filename << "'...";
102 
103     raw_fd_ostream File(Filename, EC, sys::fs::F_Text);
104     std::string GraphName = DOTGraphTraits<GraphT>::getGraphName(Graph);
105     std::string Title = GraphName + " for '" + F.getName().str() + "' function";
106 
107     if (!EC)
108       WriteGraph(File, Graph, IsSimple, Title);
109     else
110       errs() << "  error opening file for writing!";
111     errs() << "\n";
112 
113     return false;
114   }
115 
getAnalysisUsage(AnalysisUsage & AU)116   void getAnalysisUsage(AnalysisUsage &AU) const override {
117     AU.setPreservesAll();
118     AU.addRequired<AnalysisT>();
119   }
120 
121 private:
122   std::string Name;
123 };
124 
125 template <
126     typename AnalysisT, bool IsSimple, typename GraphT = AnalysisT *,
127     typename AnalysisGraphTraitsT = DefaultAnalysisGraphTraits<AnalysisT, GraphT> >
128 class DOTGraphTraitsModuleViewer : public ModulePass {
129 public:
DOTGraphTraitsModuleViewer(StringRef GraphName,char & ID)130   DOTGraphTraitsModuleViewer(StringRef GraphName, char &ID)
131       : ModulePass(ID), Name(GraphName) {}
132 
runOnModule(Module & M)133   bool runOnModule(Module &M) override {
134     GraphT Graph = AnalysisGraphTraitsT::getGraph(&getAnalysis<AnalysisT>());
135     std::string Title = DOTGraphTraits<GraphT>::getGraphName(Graph);
136 
137     ViewGraph(Graph, Name, IsSimple, Title);
138 
139     return false;
140   }
141 
getAnalysisUsage(AnalysisUsage & AU)142   void getAnalysisUsage(AnalysisUsage &AU) const override {
143     AU.setPreservesAll();
144     AU.addRequired<AnalysisT>();
145   }
146 
147 private:
148   std::string Name;
149 };
150 
151 template <
152     typename AnalysisT, bool IsSimple, typename GraphT = AnalysisT *,
153     typename AnalysisGraphTraitsT = DefaultAnalysisGraphTraits<AnalysisT, GraphT> >
154 class DOTGraphTraitsModulePrinter : public ModulePass {
155 public:
DOTGraphTraitsModulePrinter(StringRef GraphName,char & ID)156   DOTGraphTraitsModulePrinter(StringRef GraphName, char &ID)
157       : ModulePass(ID), Name(GraphName) {}
158 
runOnModule(Module & M)159   bool runOnModule(Module &M) override {
160     GraphT Graph = AnalysisGraphTraitsT::getGraph(&getAnalysis<AnalysisT>());
161     std::string Filename = Name + ".dot";
162     std::error_code EC;
163 
164     errs() << "Writing '" << Filename << "'...";
165 
166     raw_fd_ostream File(Filename, EC, sys::fs::F_Text);
167     std::string Title = DOTGraphTraits<GraphT>::getGraphName(Graph);
168 
169     if (!EC)
170       WriteGraph(File, Graph, IsSimple, Title);
171     else
172       errs() << "  error opening file for writing!";
173     errs() << "\n";
174 
175     return false;
176   }
177 
getAnalysisUsage(AnalysisUsage & AU)178   void getAnalysisUsage(AnalysisUsage &AU) const override {
179     AU.setPreservesAll();
180     AU.addRequired<AnalysisT>();
181   }
182 
183 private:
184   std::string Name;
185 };
186 
187 } // end namespace llvm
188 
189 #endif
190