Introduce RegionInfoAnalysis, which compute Region Tree in the new PassManager. NFC

Differential Revision: http://reviews.llvm.org/D17571

llvm-svn: 261904

llvm/lib/Analysis/RegionInfo.cpp

@@ -15,6 +15,7 @@
 #include "llvm/Analysis/LoopInfo.h"
 #include "llvm/Analysis/RegionInfoImpl.h"
 #include "llvm/Analysis/RegionIterator.h"
+#include "llvm/IR/PassManager.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/ErrorHandling.h"
@@ -180,3 +181,36 @@ namespace llvm {
   }
 }
 
+//===----------------------------------------------------------------------===//
+// RegionInfoAnalysis implementation
+//
+
+char RegionInfoAnalysis::PassID;
+
+RegionInfo RegionInfoAnalysis::run(Function &F, AnalysisManager<Function> *AM) {
+  RegionInfo RI;
+  auto *DT = &AM->getResult<DominatorTreeAnalysis>(F);
+  auto *PDT = &AM->getResult<PostDominatorTreeAnalysis>(F);
+  auto *DF = &AM->getResult<DominanceFrontierAnalysis>(F);
+
+  RI.recalculate(F, DT, PDT, DF);
+  return RI;
+}
+
+RegionInfoPrinterPass::RegionInfoPrinterPass(raw_ostream &OS)
+  : OS(OS) {}
+
+PreservedAnalyses
+RegionInfoPrinterPass::run(Function &F, FunctionAnalysisManager *AM) {
+  OS << "Region Tree for function: " << F.getName() << "\n";
+  AM->getResult<RegionInfoAnalysis>(F).print(OS);
+
+  return PreservedAnalyses::all();
+}
+
+PreservedAnalyses RegionInfoVerifierPass::run(Function &F,
+                                              AnalysisManager<Function> *AM) {
+  AM->getResult<RegionInfoAnalysis>(F).verifyAnalysis();
+
+  return PreservedAnalyses::all();
+}