1 files changed, 267 insertions, 0 deletions
diff --git a/contrib/llvm/lib/Analysis/RegionPrinter.cpp b/contrib/llvm/lib/Analysis/RegionPrinter.cpp
new file mode 100644
index 000000000000..5986b8c4e0c3
--- /dev/null
+++ b/contrib/llvm/lib/Analysis/RegionPrinter.cpp
@@ -0,0 +1,267 @@
+//===- RegionPrinter.cpp - Print regions tree pass ------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+// Print out the region tree of a function using dotty/graphviz.
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Analysis/RegionPrinter.h"
+#include "llvm/ADT/DepthFirstIterator.h"
+#include "llvm/ADT/PostOrderIterator.h"
+#include "llvm/ADT/Statistic.h"
+#include "llvm/Analysis/DOTGraphTraitsPass.h"
+#include "llvm/Analysis/Passes.h"
+#include "llvm/Analysis/RegionInfo.h"
+#include "llvm/Analysis/RegionIterator.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/raw_ostream.h"
+#ifndef NDEBUG
+#include "llvm/IR/LegacyPassManager.h"
+#endif
+
+using namespace llvm;
+
+//===----------------------------------------------------------------------===//
+/// onlySimpleRegion - Show only the simple regions in the RegionViewer.
+static cl::opt<bool>
+onlySimpleRegions("only-simple-regions",
+                  cl::desc("Show only simple regions in the graphviz viewer"),
+                  cl::Hidden,
+                  cl::init(false));
+
+namespace llvm {
+template<>
+struct DOTGraphTraits<RegionNode*> : public DefaultDOTGraphTraits {
+
+  DOTGraphTraits (bool isSimple=false)
+    : DefaultDOTGraphTraits(isSimple) {}
+
+  std::string getNodeLabel(RegionNode *Node, RegionNode *Graph) {
+
+    if (!Node->isSubRegion()) {
+      BasicBlock *BB = Node->getNodeAs<BasicBlock>();
+
+      if (isSimple())
+        return DOTGraphTraits<const Function*>
+          ::getSimpleNodeLabel(BB, BB->getParent());
+      else
+        return DOTGraphTraits<const Function*>
+          ::getCompleteNodeLabel(BB, BB->getParent());
+    }
+
+    return "Not implemented";
+  }
+};
+
+template <>
+struct DOTGraphTraits<RegionInfo *> : public DOTGraphTraits<RegionNode *> {
+
+  DOTGraphTraits (bool isSimple = false)
+    : DOTGraphTraits<RegionNode*>(isSimple) {}
+
+  static std::string getGraphName(const RegionInfo *) { return "Region Graph"; }
+
+  std::string getNodeLabel(RegionNode *Node, RegionInfo *G) {
+    return DOTGraphTraits<RegionNode *>::getNodeLabel(
+        Node, reinterpret_cast<RegionNode *>(G->getTopLevelRegion()));
+  }
+
+  std::string getEdgeAttributes(RegionNode *srcNode,
+                                GraphTraits<RegionInfo *>::ChildIteratorType CI,
+                                RegionInfo *G) {
+    RegionNode *destNode = *CI;
+
+    if (srcNode->isSubRegion() || destNode->isSubRegion())
+      return "";
+
+    // In case of a backedge, do not use it to define the layout of the nodes.
+    BasicBlock *srcBB = srcNode->getNodeAs<BasicBlock>();
+    BasicBlock *destBB = destNode->getNodeAs<BasicBlock>();
+
+    Region *R = G->getRegionFor(destBB);
+
+    while (R && R->getParent())
+      if (R->getParent()->getEntry() == destBB)
+        R = R->getParent();
+      else
+        break;
+
+    if (R && R->getEntry() == destBB && R->contains(srcBB))
+      return "constraint=false";
+
+    return "";
+  }
+
+  // Print the cluster of the subregions. This groups the single basic blocks
+  // and adds a different background color for each group.
+  static void printRegionCluster(const Region &R, GraphWriter<RegionInfo *> &GW,
+                                 unsigned depth = 0) {
+    raw_ostream &O = GW.getOStream();
+    O.indent(2 * depth) << "subgraph cluster_" << static_cast<const void*>(&R)
+      << " {\n";
+    O.indent(2 * (depth + 1)) << "label = \"\";\n";
+
+    if (!onlySimpleRegions || R.isSimple()) {
+      O.indent(2 * (depth + 1)) << "style = filled;\n";
+      O.indent(2 * (depth + 1)) << "color = "
+        << ((R.getDepth() * 2 % 12) + 1) << "\n";
+
+    } else {
+      O.indent(2 * (depth + 1)) << "style = solid;\n";
+      O.indent(2 * (depth + 1)) << "color = "
+        << ((R.getDepth() * 2 % 12) + 2) << "\n";
+    }
+
+    for (const auto &RI : R)
+      printRegionCluster(*RI, GW, depth + 1);
+
+    const RegionInfo &RI = *static_cast<const RegionInfo*>(R.getRegionInfo());
+
+    for (auto *BB : R.blocks())
+      if (RI.getRegionFor(BB) == &R)
+        O.indent(2 * (depth + 1)) << "Node"
+          << static_cast<const void*>(RI.getTopLevelRegion()->getBBNode(BB))
+          << ";\n";
+
+    O.indent(2 * depth) << "}\n";
+  }
+
+  static void addCustomGraphFeatures(const RegionInfo *G,
+                                     GraphWriter<RegionInfo *> &GW) {
+    raw_ostream &O = GW.getOStream();
+    O << "\tcolorscheme = \"paired12\"\n";
+    printRegionCluster(*G->getTopLevelRegion(), GW, 4);
+  }
+};
+} //end namespace llvm
+
+namespace {
+
+struct RegionInfoPassGraphTraits {
+  static RegionInfo *getGraph(RegionInfoPass *RIP) {
+    return &RIP->getRegionInfo();
+  }
+};
+
+struct RegionPrinter
+    : public DOTGraphTraitsPrinter<RegionInfoPass, false, RegionInfo *,
+                                   RegionInfoPassGraphTraits> {
+  static char ID;
+  RegionPrinter()
+      : DOTGraphTraitsPrinter<RegionInfoPass, false, RegionInfo *,
+                              RegionInfoPassGraphTraits>("reg", ID) {
+    initializeRegionPrinterPass(*PassRegistry::getPassRegistry());
+  }
+};
+char RegionPrinter::ID = 0;
+
+struct RegionOnlyPrinter
+    : public DOTGraphTraitsPrinter<RegionInfoPass, true, RegionInfo *,
+                                   RegionInfoPassGraphTraits> {
+  static char ID;
+  RegionOnlyPrinter()
+      : DOTGraphTraitsPrinter<RegionInfoPass, true, RegionInfo *,
+                              RegionInfoPassGraphTraits>("reg", ID) {
+    initializeRegionOnlyPrinterPass(*PassRegistry::getPassRegistry());
+  }
+};
+char RegionOnlyPrinter::ID = 0;
+
+struct RegionViewer
+    : public DOTGraphTraitsViewer<RegionInfoPass, false, RegionInfo *,
+                                  RegionInfoPassGraphTraits> {
+  static char ID;
+  RegionViewer()
+      : DOTGraphTraitsViewer<RegionInfoPass, false, RegionInfo *,
+                             RegionInfoPassGraphTraits>("reg", ID) {
+    initializeRegionViewerPass(*PassRegistry::getPassRegistry());
+  }
+};
+char RegionViewer::ID = 0;
+
+struct RegionOnlyViewer
+    : public DOTGraphTraitsViewer<RegionInfoPass, true, RegionInfo *,
+                                  RegionInfoPassGraphTraits> {
+  static char ID;
+  RegionOnlyViewer()
+      : DOTGraphTraitsViewer<RegionInfoPass, true, RegionInfo *,
+                             RegionInfoPassGraphTraits>("regonly", ID) {
+    initializeRegionOnlyViewerPass(*PassRegistry::getPassRegistry());
+  }
+};
+char RegionOnlyViewer::ID = 0;
+
+} //end anonymous namespace
+
+INITIALIZE_PASS(RegionPrinter, "dot-regions",
+                "Print regions of function to 'dot' file", true, true)
+
+INITIALIZE_PASS(
+    RegionOnlyPrinter, "dot-regions-only",
+    "Print regions of function to 'dot' file (with no function bodies)", true,
+    true)
+
+INITIALIZE_PASS(RegionViewer, "view-regions", "View regions of function",
+                true, true)
+
+INITIALIZE_PASS(RegionOnlyViewer, "view-regions-only",
+                "View regions of function (with no function bodies)",
+                true, true)
+
+FunctionPass *llvm::createRegionPrinterPass() { return new RegionPrinter(); }
+
+FunctionPass *llvm::createRegionOnlyPrinterPass() {
+  return new RegionOnlyPrinter();
+}
+
+FunctionPass* llvm::createRegionViewerPass() {
+  return new RegionViewer();
+}
+
+FunctionPass* llvm::createRegionOnlyViewerPass() {
+  return new RegionOnlyViewer();
+}
+
+#ifndef NDEBUG
+static void viewRegionInfo(RegionInfo *RI, bool ShortNames) {
+  assert(RI && "Argument must be non-null");
+
+  llvm::Function *F = RI->getTopLevelRegion()->getEntry()->getParent();
+  std::string GraphName = DOTGraphTraits<RegionInfo *>::getGraphName(RI);
+
+  llvm::ViewGraph(RI, "reg", ShortNames,
+                  Twine(GraphName) + " for '" + F->getName() + "' function");
+}
+
+static void invokeFunctionPass(const Function *F, FunctionPass *ViewerPass) {
+  assert(F && "Argument must be non-null");
+  assert(!F->isDeclaration() && "Function must have an implementation");
+
+  // The viewer and analysis passes do not modify anything, so we can safely
+  // remove the const qualifier
+  auto NonConstF = const_cast<Function *>(F);
+
+  llvm::legacy::FunctionPassManager FPM(NonConstF->getParent());
+  FPM.add(ViewerPass);
+  FPM.doInitialization();
+  FPM.run(*NonConstF);
+  FPM.doFinalization();
+}
+
+void llvm::viewRegion(RegionInfo *RI) { viewRegionInfo(RI, false); }
+
+void llvm::viewRegion(const Function *F) {
+  invokeFunctionPass(F, createRegionViewerPass());
+}
+
+void llvm::viewRegionOnly(RegionInfo *RI) { viewRegionInfo(RI, true); }
+
+void llvm::viewRegionOnly(const Function *F) {
+  invokeFunctionPass(F, createRegionOnlyViewerPass());
+}
+#endif