+#define DEBUG_TYPE "block-freq"
+
+#ifndef NDEBUG
+enum GVDAGType {
+ GVDT_None,
+ GVDT_Fraction,
+ GVDT_Integer
+};
+
+static cl::opt<GVDAGType>
+ViewBlockFreqPropagationDAG("view-block-freq-propagation-dags", cl::Hidden,
+ cl::desc("Pop up a window to show a dag displaying how block "
+ "frequencies propagation through the CFG."),
+ cl::values(
+ clEnumValN(GVDT_None, "none",
+ "do not display graphs."),
+ clEnumValN(GVDT_Fraction, "fraction", "display a graph using the "
+ "fractional block frequency representation."),
+ clEnumValN(GVDT_Integer, "integer", "display a graph using the raw "
+ "integer fractional block frequency representation."),
+ clEnumValEnd));
+
+namespace llvm {
+
+template <>
+struct GraphTraits<BlockFrequencyInfo *> {
+ typedef const BasicBlock NodeType;
+ typedef succ_const_iterator ChildIteratorType;
+ typedef Function::const_iterator nodes_iterator;
+
+ static inline const NodeType *getEntryNode(const BlockFrequencyInfo *G) {
+ return G->getFunction()->begin();
+ }
+ static ChildIteratorType child_begin(const NodeType *N) {
+ return succ_begin(N);
+ }
+ static ChildIteratorType child_end(const NodeType *N) {
+ return succ_end(N);
+ }
+ static nodes_iterator nodes_begin(const BlockFrequencyInfo *G) {
+ return G->getFunction()->begin();
+ }
+ static nodes_iterator nodes_end(const BlockFrequencyInfo *G) {
+ return G->getFunction()->end();
+ }
+};
+
+template<>
+struct DOTGraphTraits<BlockFrequencyInfo*> : public DefaultDOTGraphTraits {
+ explicit DOTGraphTraits(bool isSimple=false) :
+ DefaultDOTGraphTraits(isSimple) {}
+
+ static std::string getGraphName(const BlockFrequencyInfo *G) {
+ return G->getFunction()->getName();
+ }
+
+ std::string getNodeLabel(const BasicBlock *Node,
+ const BlockFrequencyInfo *Graph) {
+ std::string Result;
+ raw_string_ostream OS(Result);
+
+ OS << Node->getName().str() << ":";
+ switch (ViewBlockFreqPropagationDAG) {
+ case GVDT_Fraction:
+ Graph->printBlockFreq(OS, Node);
+ break;
+ case GVDT_Integer:
+ OS << Graph->getBlockFreq(Node).getFrequency();
+ break;
+ case GVDT_None:
+ llvm_unreachable("If we are not supposed to render a graph we should "
+ "never reach this point.");
+ }
+
+ return Result;
+ }
+};
+
+} // end namespace llvm
+#endif
+
+INITIALIZE_PASS_BEGIN(BlockFrequencyInfo, "block-freq",
+ "Block Frequency Analysis", true, true)