lib/Analysis/RegionPrinter.cpp

   1 //===- RegionPrinter.cpp - Print regions tree pass ------------------------===//
   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 // Print out the region tree of a function using dotty/graphviz.
  10 //===----------------------------------------------------------------------===//
  11
  12 #include "llvm/Analysis/RegionInfo.h"
  13 #include "llvm/Analysis/RegionIterator.h"
  14 #include "llvm/Analysis/RegionPrinter.h"
  15 #include "llvm/Analysis/Passes.h"
  16 #include "llvm/Analysis/DOTGraphTraitsPass.h"
  17 #include "llvm/ADT/Statistic.h"
  18 #include "llvm/ADT/PostOrderIterator.h"
  19 #include "llvm/ADT/DepthFirstIterator.h"
  20 #include "llvm/Support/Debug.h"
  21 #include "llvm/Support/CommandLine.h"
  22 #include "llvm/Support/raw_ostream.h"
  23
  24 using namespace llvm;
  25
  26 //===----------------------------------------------------------------------===//
  27 /// onlySimpleRegion - Show only the simple regions in the RegionViewer.
  28 static cl::opt<bool>
  29 onlySimpleRegions("only-simple-regions",
  30                   cl::desc("Show only simple regions in the graphviz viewer"),
  31                   cl::Hidden,
  32                   cl::init(false));
  33
  34 namespace llvm {
  35 template<>
  36 struct DOTGraphTraits<RegionNode*> : public DefaultDOTGraphTraits {
  37
  38   DOTGraphTraits (bool isSimple=false)
  39     : DefaultDOTGraphTraits(isSimple) {}
  40
  41   std::string getNodeLabel(RegionNode *Node, RegionNode *Graph) {
  42
  43     if (!Node->isSubRegion()) {
  44       BasicBlock *BB = Node->getNodeAs<BasicBlock>();
  45
  46       if (isSimple())
  47         return DOTGraphTraits<const Function*>
  48           ::getSimpleNodeLabel(BB, BB->getParent());
  49       else
  50         return DOTGraphTraits<const Function*>
  51           ::getCompleteNodeLabel(BB, BB->getParent());
  52     }
  53
  54     return "Not implemented";
  55   }
  56 };
  57
  58 template<>
  59 struct DOTGraphTraits<RegionInfo*> : public DOTGraphTraits<RegionNode*> {
  60
  61   DOTGraphTraits (bool isSimple=false)
  62     : DOTGraphTraits<RegionNode*>(isSimple) {}
  63
  64   static std::string getGraphName(RegionInfo *DT) {
  65     return "Region Graph";
  66   }
  67
  68   std::string getNodeLabel(RegionNode *Node, RegionInfo *G) {
  69     return DOTGraphTraits<RegionNode*>::getNodeLabel(Node,
  70                                                      G->getTopLevelRegion());
  71   }
  72
  73   std::string getEdgeAttributes(RegionNode *srcNode,
  74     GraphTraits<RegionInfo*>::ChildIteratorType CI, RegionInfo *RI) {
  75
  76     RegionNode *destNode = *CI;
  77
  78     if (srcNode->isSubRegion() || destNode->isSubRegion())
  79       return "";
  80
  81     // In case of a backedge, do not use it to define the layout of the nodes.
  82     BasicBlock *srcBB = srcNode->getNodeAs<BasicBlock>();
  83     BasicBlock *destBB = destNode->getNodeAs<BasicBlock>();
  84
  85     Region *R = RI->getRegionFor(destBB);
  86
  87     while (R && R->getParent())
  88       if (R->getParent()->getEntry() == destBB)
  89         R = R->getParent();
  90       else
  91         break;
  92
  93     if (R->getEntry() == destBB && R->contains(srcBB))
  94       return "constraint=false";
  95
  96     return "";
  97   }
  98
  99   // Print the cluster of the subregions. This groups the single basic blocks
 100   // and adds a different background color for each group.
 101   static void printRegionCluster(const Region *R, GraphWriter<RegionInfo*> &GW,
 102                                  unsigned depth = 0) {
 103     raw_ostream &O = GW.getOStream();
 104     O.indent(2 * depth) << "subgraph cluster_" << static_cast<const void*>(R)
 105       << " {\n";
 106     O.indent(2 * (depth + 1)) << "label = \"\";\n";
 107
 108     if (!onlySimpleRegions || R->isSimple()) {
 109       O.indent(2 * (depth + 1)) << "style = filled;\n";
 110       O.indent(2 * (depth + 1)) << "color = "
 111         << ((R->getDepth() * 2 % 12) + 1) << "\n";
 112
 113     } else {
 114       O.indent(2 * (depth + 1)) << "style = solid;\n";
 115       O.indent(2 * (depth + 1)) << "color = "
 116         << ((R->getDepth() * 2 % 12) + 2) << "\n";
 117     }
 118
 119     for (Region::const_iterator RI = R->begin(), RE = R->end(); RI != RE; ++RI)
 120       printRegionCluster(*RI, GW, depth + 1);
 121
 122     RegionInfo *RI = R->getRegionInfo();
 123
 124     for (Region::const_block_iterator BI = R->block_begin(),
 125          BE = R->block_end(); BI != BE; ++BI) {
 126       BasicBlock *BB = (*BI)->getNodeAs<BasicBlock>();
 127       if (RI->getRegionFor(BB) == R)
 128         O.indent(2 * (depth + 1)) << "Node"
 129           << static_cast<const void*>(RI->getTopLevelRegion()->getBBNode(BB))
 130           << ";\n";
 131     }
 132
 133     O.indent(2 * depth) << "}\n";
 134   }
 135
 136   static void addCustomGraphFeatures(const RegionInfo* RI,
 137                                      GraphWriter<RegionInfo*> &GW) {
 138     raw_ostream &O = GW.getOStream();
 139     O << "\tcolorscheme = \"paired12\"\n";
 140     printRegionCluster(RI->getTopLevelRegion(), GW, 4);
 141   }
 142 };
 143 } //end namespace llvm
 144
 145 namespace {
 146
 147 struct RegionViewer
 148   : public DOTGraphTraitsViewer<RegionInfo, false> {
 149   static char ID;
 150   RegionViewer() : DOTGraphTraitsViewer<RegionInfo, false>("reg", ID){
 151     initializeRegionViewerPass(*PassRegistry::getPassRegistry());
 152   }
 153 };
 154 char RegionViewer::ID = 0;
 155
 156 struct RegionOnlyViewer
 157   : public DOTGraphTraitsViewer<RegionInfo, true> {
 158   static char ID;
 159   RegionOnlyViewer() : DOTGraphTraitsViewer<RegionInfo, true>("regonly", ID) {
 160     initializeRegionOnlyViewerPass(*PassRegistry::getPassRegistry());
 161   }
 162 };
 163 char RegionOnlyViewer::ID = 0;
 164
 165 struct RegionPrinter
 166   : public DOTGraphTraitsPrinter<RegionInfo, false> {
 167   static char ID;
 168   RegionPrinter() :
 169     DOTGraphTraitsPrinter<RegionInfo, false>("reg", ID) {
 170       initializeRegionPrinterPass(*PassRegistry::getPassRegistry());
 171     }
 172 };
 173 char RegionPrinter::ID = 0;
 174 } //end anonymous namespace
 175
 176 INITIALIZE_PASS(RegionPrinter, "dot-regions",
 177                 "Print regions of function to 'dot' file", true, true)
 178
 179 INITIALIZE_PASS(RegionViewer, "view-regions", "View regions of function",
 180                 true, true)
 181
 182 INITIALIZE_PASS(RegionOnlyViewer, "view-regions-only",
 183                 "View regions of function (with no function bodies)",
 184                 true, true)
 185
 186 namespace {
 187
 188 struct RegionOnlyPrinter
 189   : public DOTGraphTraitsPrinter<RegionInfo, true> {
 190   static char ID;
 191   RegionOnlyPrinter() :
 192     DOTGraphTraitsPrinter<RegionInfo, true>("reg", ID) {
 193       initializeRegionOnlyPrinterPass(*PassRegistry::getPassRegistry());
 194     }
 195 };
 196
 197 }
 198
 199 char RegionOnlyPrinter::ID = 0;
 200 INITIALIZE_PASS(RegionOnlyPrinter, "dot-regions-only",
 201                 "Print regions of function to 'dot' file "
 202                 "(with no function bodies)",
 203                 true, true)
 204
 205 FunctionPass* llvm::createRegionViewerPass() {
 206   return new RegionViewer();
 207 }
 208
 209 FunctionPass* llvm::createRegionOnlyViewerPass() {
 210   return new RegionOnlyViewer();
 211 }
 212
 213 FunctionPass* llvm::createRegionPrinterPass() {
 214   return new RegionPrinter();
 215 }
 216
 217 FunctionPass* llvm::createRegionOnlyPrinterPass() {
 218   return new RegionOnlyPrinter();
 219 }
 220