vendor/llvm/llvm-trunk-r290819

1 files changed, 60 insertions, 2 deletions

diff --git a/include/llvm/Analysis/CFGPrinter.h b/include/llvm/Analysis/CFGPrinter.h
index 035764837e6f0..efaa9d6df8ea9 100644
--- a/include/llvm/Analysis/CFGPrinter.h
+++ b/include/llvm/Analysis/CFGPrinter.h
@@ -7,6 +7,10 @@
 //
 //===----------------------------------------------------------------------===//
 //
+// This file defines a 'dot-cfg' analysis pass, which emits the
+// cfg.<fnname>.dot file for each function in the program, with a graph of the
+// CFG for that function.
+//
 // This file defines external functions that can be called to explicitly
 // instantiate the CFG printer.
 //
@@ -19,9 +23,34 @@
 #include "llvm/IR/Constants.h"
 #include "llvm/IR/Function.h"
 #include "llvm/IR/Instructions.h"
+#include "llvm/IR/PassManager.h"
 #include "llvm/Support/GraphWriter.h"
 
 namespace llvm {
+class CFGViewerPass
+    : public PassInfoMixin<CFGViewerPass> {
+public:
+  PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);
+};
+
+class CFGOnlyViewerPass
+    : public PassInfoMixin<CFGOnlyViewerPass> {
+public:
+  PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);
+};
+
+class CFGPrinterPass
+    : public PassInfoMixin<CFGPrinterPass> {
+public:
+  PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);
+};
+
+class CFGOnlyPrinterPass
+    : public PassInfoMixin<CFGOnlyPrinterPass> {
+public:
+  PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);
+};
+
 template<>
 struct DOTGraphTraits<const Function*> : public DefaultDOTGraphTraits {
 
@@ -118,13 +147,42 @@ struct DOTGraphTraits<const Function*> : public DefaultDOTGraphTraits {
     }
     return "";
   }
+
+  /// Display the raw branch weights from PGO.
+  std::string getEdgeAttributes(const BasicBlock *Node, succ_const_iterator I,
+                                const Function *F) {
+    const TerminatorInst *TI = Node->getTerminator();
+    if (TI->getNumSuccessors() == 1)
+      return "";
+
+    MDNode *WeightsNode = TI->getMetadata(LLVMContext::MD_prof);
+    if (!WeightsNode)
+      return "";
+
+    MDString *MDName = cast<MDString>(WeightsNode->getOperand(0));
+    if (MDName->getString() != "branch_weights")
+      return "";
+
+    unsigned OpNo = I.getSuccessorIndex() + 1;
+    if (OpNo >= WeightsNode->getNumOperands())
+      return "";
+    ConstantInt *Weight =
+        mdconst::dyn_extract<ConstantInt>(WeightsNode->getOperand(OpNo));
+    if (!Weight)
+      return "";
+
+    // Prepend a 'W' to indicate that this is a weight rather than the actual
+    // profile count (due to scaling).
+    Twine Attrs = "label=\"W:" + Twine(Weight->getZExtValue()) + "\"";
+    return Attrs.str();
+  }
 };
 } // End llvm namespace
 
 namespace llvm {
   class FunctionPass;
-  FunctionPass *createCFGPrinterPass ();
-  FunctionPass *createCFGOnlyPrinterPass ();
+  FunctionPass *createCFGPrinterLegacyPassPass ();
+  FunctionPass *createCFGOnlyPrinterLegacyPassPass ();
 } // End llvm namespace
 
 #endif