LLVM  3.7.0
GraphWriter.cpp
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1 //===-- GraphWriter.cpp - Implements GraphWriter support routines ---------===//
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 implements misc. GraphWriter support routines.
11 //
12 //===----------------------------------------------------------------------===//
13 
15 #include "llvm/Config/config.h"
18 #include "llvm/Support/Program.h"
19 using namespace llvm;
20 
21 static cl::opt<bool> ViewBackground("view-background", cl::Hidden,
22  cl::desc("Execute graph viewer in the background. Creates tmp file litter."));
23 
24 std::string llvm::DOT::EscapeString(const std::string &Label) {
25  std::string Str(Label);
26  for (unsigned i = 0; i != Str.length(); ++i)
27  switch (Str[i]) {
28  case '\n':
29  Str.insert(Str.begin()+i, '\\'); // Escape character...
30  ++i;
31  Str[i] = 'n';
32  break;
33  case '\t':
34  Str.insert(Str.begin()+i, ' '); // Convert to two spaces
35  ++i;
36  Str[i] = ' ';
37  break;
38  case '\\':
39  if (i+1 != Str.length())
40  switch (Str[i+1]) {
41  case 'l': continue; // don't disturb \l
42  case '|': case '{': case '}':
43  Str.erase(Str.begin()+i); continue;
44  default: break;
45  }
46  case '{': case '}':
47  case '<': case '>':
48  case '|': case '"':
49  Str.insert(Str.begin()+i, '\\'); // Escape character...
50  ++i; // don't infinite loop
51  break;
52  }
53  return Str;
54 }
55 
56 /// \brief Get a color string for this node number. Simply round-robin selects
57 /// from a reasonable number of colors.
58 StringRef llvm::DOT::getColorString(unsigned ColorNumber) {
59  static const int NumColors = 20;
60  static const char* Colors[NumColors] = {
61  "aaaaaa", "aa0000", "00aa00", "aa5500", "0055ff", "aa00aa", "00aaaa",
62  "555555", "ff5555", "55ff55", "ffff55", "5555ff", "ff55ff", "55ffff",
63  "ffaaaa", "aaffaa", "ffffaa", "aaaaff", "ffaaff", "aaffff"};
64  return Colors[ColorNumber % NumColors];
65 }
66 
67 std::string llvm::createGraphFilename(const Twine &Name, int &FD) {
68  FD = -1;
69  SmallString<128> Filename;
70  std::error_code EC = sys::fs::createTemporaryFile(Name, "dot", FD, Filename);
71  if (EC) {
72  errs() << "Error: " << EC.message() << "\n";
73  return "";
74  }
75 
76  errs() << "Writing '" << Filename << "'... ";
77  return Filename.str();
78 }
79 
80 // Execute the graph viewer. Return true if there were errors.
81 static bool ExecGraphViewer(StringRef ExecPath, std::vector<const char *> &args,
82  StringRef Filename, bool wait,
83  std::string &ErrMsg) {
84  assert(args.back() == nullptr);
85  if (wait) {
86  if (sys::ExecuteAndWait(ExecPath, args.data(), nullptr, nullptr, 0, 0,
87  &ErrMsg)) {
88  errs() << "Error: " << ErrMsg << "\n";
89  return true;
90  }
91  sys::fs::remove(Filename);
92  errs() << " done. \n";
93  } else {
94  sys::ExecuteNoWait(ExecPath, args.data(), nullptr, nullptr, 0, &ErrMsg);
95  errs() << "Remember to erase graph file: " << Filename << "\n";
96  }
97  return false;
98 }
99 
100 namespace {
101 struct GraphSession {
102  std::string LogBuffer;
103  bool TryFindProgram(StringRef Names, std::string &ProgramPath) {
104  raw_string_ostream Log(LogBuffer);
106  Names.split(parts, "|");
107  for (auto Name : parts) {
109  ProgramPath = *P;
110  return true;
111  }
112  Log << " Tried '" << Name << "'\n";
113  }
114  return false;
115  }
116 };
117 } // namespace
118 
119 static const char *getProgramName(GraphProgram::Name program) {
120  switch (program) {
121  case GraphProgram::DOT:
122  return "dot";
123  case GraphProgram::FDP:
124  return "fdp";
125  case GraphProgram::NEATO:
126  return "neato";
127  case GraphProgram::TWOPI:
128  return "twopi";
129  case GraphProgram::CIRCO:
130  return "circo";
131  }
132  llvm_unreachable("bad kind");
133 }
134 
135 bool llvm::DisplayGraph(StringRef FilenameRef, bool wait,
136  GraphProgram::Name program) {
137  std::string Filename = FilenameRef;
138  std::string ErrMsg;
139  std::string ViewerPath;
140  GraphSession S;
141 
142 #ifdef __APPLE__
143  wait &= !ViewBackground;
144  if (S.TryFindProgram("open", ViewerPath)) {
145  std::vector<const char *> args;
146  args.push_back(ViewerPath.c_str());
147  if (wait)
148  args.push_back("-W");
149  args.push_back(Filename.c_str());
150  args.push_back(nullptr);
151  errs() << "Trying 'open' program... ";
152  if (!ExecGraphViewer(ViewerPath, args, Filename, wait, ErrMsg))
153  return false;
154  }
155 #endif
156  if (S.TryFindProgram("xdg-open", ViewerPath)) {
157  std::vector<const char *> args;
158  args.push_back(ViewerPath.c_str());
159  args.push_back(Filename.c_str());
160  args.push_back(nullptr);
161  errs() << "Trying 'xdg-open' program... ";
162  if (!ExecGraphViewer(ViewerPath, args, Filename, wait, ErrMsg))
163  return false;
164  }
165 
166  // Graphviz
167  if (S.TryFindProgram("Graphviz", ViewerPath)) {
168  std::vector<const char *> args;
169  args.push_back(ViewerPath.c_str());
170  args.push_back(Filename.c_str());
171  args.push_back(nullptr);
172 
173  errs() << "Running 'Graphviz' program... ";
174  return ExecGraphViewer(ViewerPath, args, Filename, wait, ErrMsg);
175  }
176 
177  // xdot
178  if (S.TryFindProgram("xdot|xdot.py", ViewerPath)) {
179  std::vector<const char *> args;
180  args.push_back(ViewerPath.c_str());
181  args.push_back(Filename.c_str());
182 
183  args.push_back("-f");
184  args.push_back(getProgramName(program));
185 
186  args.push_back(nullptr);
187 
188  errs() << "Running 'xdot.py' program... ";
189  return ExecGraphViewer(ViewerPath, args, Filename, wait, ErrMsg);
190  }
191 
192  enum PSViewerKind { PSV_None, PSV_OSXOpen, PSV_XDGOpen, PSV_Ghostview };
193  PSViewerKind PSViewer = PSV_None;
194 #ifdef __APPLE__
195  if (!PSViewer && S.TryFindProgram("open", ViewerPath))
196  PSViewer = PSV_OSXOpen;
197 #endif
198  if (!PSViewer && S.TryFindProgram("gv", ViewerPath))
199  PSViewer = PSV_Ghostview;
200  if (!PSViewer && S.TryFindProgram("xdg-open", ViewerPath))
201  PSViewer = PSV_XDGOpen;
202 
203  // PostScript graph generator + PostScript viewer
204  std::string GeneratorPath;
205  if (PSViewer &&
206  (S.TryFindProgram(getProgramName(program), GeneratorPath) ||
207  S.TryFindProgram("dot|fdp|neato|twopi|circo", GeneratorPath))) {
208  std::string PSFilename = Filename + ".ps";
209 
210  std::vector<const char *> args;
211  args.push_back(GeneratorPath.c_str());
212  args.push_back("-Tps");
213  args.push_back("-Nfontname=Courier");
214  args.push_back("-Gsize=7.5,10");
215  args.push_back(Filename.c_str());
216  args.push_back("-o");
217  args.push_back(PSFilename.c_str());
218  args.push_back(nullptr);
219 
220  errs() << "Running '" << GeneratorPath << "' program... ";
221 
222  if (ExecGraphViewer(GeneratorPath, args, Filename, wait, ErrMsg))
223  return true;
224 
225  args.clear();
226  args.push_back(ViewerPath.c_str());
227  switch (PSViewer) {
228  case PSV_OSXOpen:
229  args.push_back("-W");
230  args.push_back(PSFilename.c_str());
231  break;
232  case PSV_XDGOpen:
233  wait = false;
234  args.push_back(PSFilename.c_str());
235  break;
236  case PSV_Ghostview:
237  args.push_back("--spartan");
238  args.push_back(PSFilename.c_str());
239  break;
240  case PSV_None:
241  llvm_unreachable("Invalid viewer");
242  }
243  args.push_back(nullptr);
244 
245  ErrMsg.clear();
246  return ExecGraphViewer(ViewerPath, args, PSFilename, wait, ErrMsg);
247  }
248 
249  // dotty
250  if (S.TryFindProgram("dotty", ViewerPath)) {
251  std::vector<const char *> args;
252  args.push_back(ViewerPath.c_str());
253  args.push_back(Filename.c_str());
254  args.push_back(nullptr);
255 
256 // Dotty spawns another app and doesn't wait until it returns
257 #ifdef LLVM_ON_WIN32
258  wait = false;
259 #endif
260  errs() << "Running 'dotty' program... ";
261  return ExecGraphViewer(ViewerPath, args, Filename, wait, ErrMsg);
262  }
263 
264  errs() << "Error: Couldn't find a usable graph viewer program:\n";
265  errs() << S.LogBuffer << "\n";
266  return true;
267 }
Represents either an error or a value T.
Definition: ErrorOr.h:82
raw_ostream & errs()
This returns a reference to a raw_ostream for standard error.
static cl::opt< bool > ViewBackground("view-background", cl::Hidden, cl::desc("Execute graph viewer in the background. Creates tmp file litter."))
static const char * getProgramName(GraphProgram::Name program)
std::error_code remove(const Twine &path, bool IgnoreNonExisting=true)
Remove path.
std::pair< StringRef, StringRef > split(char Separator) const
Split into two substrings around the first occurrence of a separator character.
Definition: StringRef.h:450
ProcessInfo ExecuteNoWait(StringRef Program, const char **args, const char **env=nullptr, const StringRef **redirects=nullptr, unsigned memoryLimit=0, std::string *ErrMsg=nullptr, bool *ExecutionFailed=nullptr)
Similar to ExecuteAndWait, but returns immediately.
Definition: Program.cpp:49
ErrorOr< std::string > findProgramByName(StringRef Name, ArrayRef< StringRef > Paths=ArrayRef< StringRef >())
Find the first executable file Name in Paths.
static bool ExecGraphViewer(StringRef ExecPath, std::vector< const char * > &args, StringRef Filename, bool wait, std::string &ErrMsg)
Definition: GraphWriter.cpp:81
Twine - A lightweight data structure for efficiently representing the concatenation of temporary valu...
Definition: Twine.h:79
#define llvm_unreachable(msg)
Marks that the current location is not supposed to be reachable.
Definition: ErrorHandling.h:98
const char * data() const
data - Get a pointer to the start of the string (which may not be null terminated).
Definition: StringRef.h:107
int ExecuteAndWait(StringRef Program, const char **args, const char **env=nullptr, const StringRef **redirects=nullptr, unsigned secondsToWait=0, unsigned memoryLimit=0, std::string *ErrMsg=nullptr, bool *ExecutionFailed=nullptr)
This function executes the program using the arguments provided.
Definition: Program.cpp:30
#define P(N)
std::string EscapeString(const std::string &Label)
Definition: GraphWriter.cpp:24
This is a 'vector' (really, a variable-sized array), optimized for the case when the array is small...
Definition: SmallVector.h:861
std::string createGraphFilename(const Twine &Name, int &FD)
Definition: GraphWriter.cpp:67
StringRef getColorString(unsigned NodeNumber)
Get a color string for this node number.
Definition: GraphWriter.cpp:58
StringRef str() const
Explicit conversion to StringRef.
Definition: SmallString.h:267
bool DisplayGraph(StringRef Filename, bool wait=true, GraphProgram::Name program=GraphProgram::DOT)
std::error_code createTemporaryFile(const Twine &Prefix, StringRef Suffix, int &ResultFD, SmallVectorImpl< char > &ResultPath)
Create a file in the system temporary directory.
Definition: Path.cpp:713
A raw_ostream that writes to an std::string.
Definition: raw_ostream.h:465
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:40