SelectionDAGPrinter.cpp revision 66328480bb3eb6aa52e2c155657f3d19d4efea7a 
1//===-- SelectionDAGPrinter.cpp - Implement SelectionDAG::viewGraph() -----===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file was developed by the LLVM research group and is distributed under
6// the University of Illinois Open Source License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This implements the SelectionDAG::viewGraph method.
11//
12//===----------------------------------------------------------------------===//
13
14#include "llvm/CodeGen/SelectionDAG.h"
15#include "llvm/CodeGen/MachineFunction.h"
16#include "llvm/Function.h"
17#include "llvm/Support/GraphWriter.h"
18#include <fstream>
19using namespace llvm;
20
21/// viewGraph - Pop up a ghostview window with the reachable parts of the DAG
22/// rendered using 'dot'.
23///
24void SelectionDAG::viewGraph() {
25  std::string Filename = "/tmp/dag." +
26    getMachineFunction().getFunction()->getName() + ".dot";
27  std::cerr << "Writing '" << Filename << "'... ";
28  std::ofstream F(Filename.c_str());
29
30  if (!F) {
31    std::cerr << "  error opening file for writing!\n";
32    return;
33  }
34
35  WriteGraph(F, this);
36  F.close();
37  std::cerr << "\n";
38
39  std::cerr << "Running 'dot' program... " << std::flush;
40  if (system(("dot -Tps -Nfontname=Courier -Gsize=7.5,10 " + Filename
41              + " > /tmp/dag.tempgraph.ps").c_str())) {
42    std::cerr << "Error running dot: 'dot' not in path?\n";
43  } else {
44    std::cerr << "\n";
45    system("gv /tmp/dag.tempgraph.ps");
46  }
47  system(("rm " + Filename + " /tmp/dag.tempgraph.ps").c_str());
48}
49