[PM] Port domtree to the new pass manager (at last).

This adds the domtree analysis to the new pass manager. The analysis
returns the same DominatorTree result entity used by the old pass
manager and essentially all of the code is shared. We just have
different boilerplate for running and printing the analysis.

I've converted one test to run in both modes just to make sure this is
exercised while both are live in the tree.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225969 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/IR/Dominators.h

@@ -31,6 +31,11 @@
 
 namespace llvm {
 
+// FIXME: Replace this brittle forward declaration with the include of the new
+// PassManager.h when doing so doesn't break the PassManagerBuilder.
+template <typename IRUnitT> class AnalysisManager;
+class PreservedAnalyses;
+
 EXTERN_TEMPLATE_INSTANTIATION(class DomTreeNodeBase<BasicBlock>);
 EXTERN_TEMPLATE_INSTANTIATION(class DominatorTreeBase<BasicBlock>);
 
@@ -162,6 +167,43 @@ template <> struct GraphTraits<DominatorTree*>
 };
 
 /// \brief Analysis pass which computes a \c DominatorTree.
+class DominatorTreeAnalysis {
+public:
+  /// \brief Provide the result typedef for this analysis pass.
+  typedef DominatorTree Result;
+
+  /// \brief Opaque, unique identifier for this analysis pass.
+  static void *ID() { return (void *)&PassID; }
+
+  /// \brief Run the analysis pass over a function and produce a dominator tree.
+  DominatorTree run(Function &F);
+
+  /// \brief Provide access to a name for this pass for debugging purposes.
+  static StringRef name() { return "DominatorTreeAnalysis"; }
+
+private:
+  static char PassID;
+};
+
+/// \brief Printer pass for the \c DominatorTree.
+class DominatorTreePrinterPass {
+  raw_ostream &OS;
+
+public:
+  explicit DominatorTreePrinterPass(raw_ostream &OS);
+  PreservedAnalyses run(Function &F, AnalysisManager<Function> *AM);
+
+  static StringRef name() { return "DominatorTreePrinterPass"; }
+};
+
+/// \brief Verifier pass for the \c DominatorTree.
+struct DominatorTreeVerifierPass {
+  PreservedAnalyses run(Function &F, AnalysisManager<Function> *AM);
+
+  static StringRef name() { return "DominatorTreeVerifierPass"; }
+};
+
+/// \brief Legacy analysis pass which computes a \c DominatorTree.
 class DominatorTreeWrapperPass : public FunctionPass {
   DominatorTree DT;
 

lib/IR/Dominators.cpp

@@ -20,6 +20,7 @@
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/IR/CFG.h"
 #include "llvm/IR/Instructions.h"
+#include "llvm/IR/PassManager.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/Compiler.h"
 #include "llvm/Support/Debug.h"
@@ -297,11 +298,46 @@ void DominatorTree::verifyDomTree() const {
   }
 }
 
+//===----------------------------------------------------------------------===//
+//  DominatorTreeAnalysis and related pass implementations
+//===----------------------------------------------------------------------===//
+//
+// This implements the DominatorTreeAnalysis which is used with the new pass
+// manager. It also implements some methods from utility passes.
+//
+//===----------------------------------------------------------------------===//
+
+DominatorTree DominatorTreeAnalysis::run(Function &F) {
+  DominatorTree DT;
+  DT.recalculate(F);
+  return DT;
+}
+
+char DominatorTreeAnalysis::PassID;
+
+DominatorTreePrinterPass::DominatorTreePrinterPass(raw_ostream &OS) : OS(OS) {}
+
+PreservedAnalyses DominatorTreePrinterPass::run(Function &F,
+                                                FunctionAnalysisManager *AM) {
+  OS << "DominatorTree for function: " << F.getName() << "\n";
+  AM->getResult<DominatorTreeAnalysis>(F).print(OS);
+
+  return PreservedAnalyses::all();
+}
+
+PreservedAnalyses DominatorTreeVerifierPass::run(Function &F,
+                                                 FunctionAnalysisManager *AM) {
+  AM->getResult<DominatorTreeAnalysis>(F).verifyDomTree();
+
+  return PreservedAnalyses::all();
+}
+
 //===----------------------------------------------------------------------===//
 //  DominatorTreeWrapperPass Implementation
 //===----------------------------------------------------------------------===//
 //
-// The implementation details of the wrapper pass that holds a DominatorTree.
+// The implementation details of the wrapper pass that holds a DominatorTree
+// suitable for use with the legacy pass manager.
 //
 //===----------------------------------------------------------------------===//
 

test/Analysis/Dominators/basic.ll

@@ -1,7 +1,9 @@
-; RUN: opt < %s -domtree -analyze | FileCheck %s
+; RUN: opt < %s -domtree -analyze | FileCheck %s -check-prefix=CHECK -check-prefix=CHECK-OLDPM
+; RUN: opt < %s -disable-output -passes='print<domtree>' 2>&1 | FileCheck %s -check-prefix=CHECK -check-prefix=CHECK-NEWPM
 
 define void @test1() {
-; CHECK-LABEL: 'Dominator Tree Construction' for function 'test1':
+; CHECK-OLDPM-LABEL: 'Dominator Tree Construction' for function 'test1':
+; CHECK-NEWPM-LABEL: DominatorTree for function: test1
 ; CHECK:      [1] %entry
 ; CHECK-NEXT:   [2] %a
 ; CHECK-NEXT:   [2] %c
@@ -29,7 +31,8 @@ e:
 }
 
 define void @test2() {
-; CHECK-LABEL: 'Dominator Tree Construction' for function 'test2':
+; CHECK-OLDPM-LABEL: 'Dominator Tree Construction' for function 'test2':
+; CHECK-NEWPM-LABEL: DominatorTree for function: test2
 ; CHECK:      [1] %entry
 ; CHECK-NEXT:   [2] %a
 ; CHECK-NEXT:     [3] %b

tools/opt/NewPMDriver.cpp

@@ -18,6 +18,7 @@
 #include "llvm/ADT/StringRef.h"
 #include "llvm/Analysis/CGSCCPassManager.h"
 #include "llvm/Bitcode/BitcodeWriterPass.h"
+#include "llvm/IR/Dominators.h"
 #include "llvm/IR/IRPrintingPasses.h"
 #include "llvm/IR/LLVMContext.h"
 #include "llvm/IR/Module.h"

tools/opt/PassRegistry.def

@@ -49,6 +49,7 @@ CGSCC_PASS("no-op-cgscc", NoOpCGSCCPass())
 #ifndef FUNCTION_ANALYSIS
 #define FUNCTION_ANALYSIS(NAME, CREATE_PASS)
 #endif
+FUNCTION_ANALYSIS("domtree", DominatorTreeAnalysis())
 FUNCTION_ANALYSIS("no-op-function", NoOpFunctionAnalysis())
 #undef FUNCTION_ANALYSIS
 
@@ -58,5 +59,7 @@ FUNCTION_ANALYSIS("no-op-function", NoOpFunctionAnalysis())
 FUNCTION_PASS("invalidate<all>", InvalidateAllAnalysesPass())
 FUNCTION_PASS("no-op-function", NoOpFunctionPass())
 FUNCTION_PASS("print", PrintFunctionPass(dbgs()))
+FUNCTION_PASS("print<domtree>", DominatorTreePrinterPass(dbgs()))
 FUNCTION_PASS("verify", VerifierPass())
+FUNCTION_PASS("verify<domtree>", DominatorTreeVerifierPass())
 #undef FUNCTION_PASS

tools/opt/Passes.cpp

@@ -17,6 +17,7 @@
 #include "Passes.h"
 #include "llvm/Analysis/CGSCCPassManager.h"
 #include "llvm/Analysis/LazyCallGraph.h"
+#include "llvm/IR/Dominators.h"
 #include "llvm/IR/IRPrintingPasses.h"
 #include "llvm/IR/PassManager.h"
 #include "llvm/IR/Verifier.h"