Port CodeGenPrepare to new pass manager (and BasicBlockSectionsProfil…

…eReader)

Co-authored-by: Krishna-13-cyber <84722531+Krishna-13-cyber@users.noreply.github.com>

llvm/include/llvm/CodeGen/BasicBlockSectionsProfileReader.h

@@ -21,11 +21,14 @@
 #include "llvm/ADT/StringRef.h"
 #include "llvm/CodeGen/MachineBasicBlock.h"
 #include "llvm/IR/Module.h"
+#include "llvm/IR/PassManager.h"
 #include "llvm/InitializePasses.h"
 #include "llvm/Pass.h"
 #include "llvm/Support/Error.h"
 #include "llvm/Support/LineIterator.h"
 #include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Target/TargetMachine.h"
+
 using namespace llvm;
 
 namespace llvm {
@@ -72,25 +75,13 @@ template <> struct DenseMapInfo<UniqueBBID> {
   }
 };
 
-class BasicBlockSectionsProfileReader : public ImmutablePass {
+class BasicBlockSectionsProfileReader {
 public:
-  static char ID;
-
+  friend class BasicBlockSectionsProfileReaderWrapperPass;
   BasicBlockSectionsProfileReader(const MemoryBuffer *Buf)
-      : ImmutablePass(ID), MBuf(Buf),
-        LineIt(*Buf, /*SkipBlanks=*/true, /*CommentMarker=*/'#') {
-    initializeBasicBlockSectionsProfileReaderPass(
-        *PassRegistry::getPassRegistry());
-  };
+      : MBuf(Buf), LineIt(*Buf, /*SkipBlanks=*/true, /*CommentMarker=*/'#'){};
 
-  BasicBlockSectionsProfileReader() : ImmutablePass(ID) {
-    initializeBasicBlockSectionsProfileReaderPass(
-        *PassRegistry::getPassRegistry());
-  }
-
-  StringRef getPassName() const override {
-    return "Basic Block Sections Profile Reader";
-  }
+  BasicBlockSectionsProfileReader(){};
 
   // Returns true if basic block sections profile exist for function \p
   // FuncName.
@@ -109,10 +100,6 @@ class BasicBlockSectionsProfileReader : public ImmutablePass {
   SmallVector<SmallVector<unsigned>>
   getClonePathsForFunction(StringRef FuncName) const;
 
-  // Initializes the FunctionNameToDIFilename map for the current module and
-  // then reads the profile for the matching functions.
-  bool doInitialization(Module &M) override;
-
 private:
   StringRef getAliasName(StringRef FuncName) const {
     auto R = FuncAliasMap.find(FuncName);
@@ -170,7 +157,61 @@ class BasicBlockSectionsProfileReader : public ImmutablePass {
 // sections profile. \p Buf is a memory buffer that contains the list of
 // functions and basic block ids to selectively enable basic block sections.
 ImmutablePass *
-createBasicBlockSectionsProfileReaderPass(const MemoryBuffer *Buf);
+createBasicBlockSectionsProfileReaderWrapperPass(const MemoryBuffer *Buf);
+
+/// Analysis pass providing the \c BasicBlockSectionsProfileReader.
+///
+/// Note that this pass's result cannot be invalidated, it is immutable for the
+/// life of the module.
+class BasicBlockSectionsProfileReaderAnalysis
+    : public AnalysisInfoMixin<BasicBlockSectionsProfileReaderAnalysis> {
+
+public:
+  static AnalysisKey Key;
+  typedef BasicBlockSectionsProfileReader Result;
+  BasicBlockSectionsProfileReaderAnalysis(const TargetMachine *TM) : TM(TM) {}
+
+  Result run(Function &F, FunctionAnalysisManager &AM);
+
+private:
+  const TargetMachine *TM;
+};
+
+class BasicBlockSectionsProfileReaderWrapperPass : public ImmutablePass {
+public:
+  static char ID;
+  BasicBlockSectionsProfileReader BBSPR;
+
+  BasicBlockSectionsProfileReaderWrapperPass(const MemoryBuffer *Buf)
+      : ImmutablePass(ID), BBSPR(BasicBlockSectionsProfileReader(Buf)) {
+    initializeBasicBlockSectionsProfileReaderWrapperPassPass(
+        *PassRegistry::getPassRegistry());
+  };
+
+  BasicBlockSectionsProfileReaderWrapperPass()
+      : ImmutablePass(ID), BBSPR(BasicBlockSectionsProfileReader()) {
+    initializeBasicBlockSectionsProfileReaderWrapperPassPass(
+        *PassRegistry::getPassRegistry());
+  }
+
+  StringRef getPassName() const override {
+    return "Basic Block Sections Profile Reader";
+  }
+
+  bool isFunctionHot(StringRef FuncName) const;
+
+  std::pair<bool, SmallVector<BBClusterInfo>>
+  getClusterInfoForFunction(StringRef FuncName) const;
+
+  SmallVector<SmallVector<unsigned>>
+  getClonePathsForFunction(StringRef FuncName) const;
+
+  // Initializes the FunctionNameToDIFilename map for the current module and
+  // then reads the profile for the matching functions.
+  bool doInitialization(Module &M) override;
+
+  BasicBlockSectionsProfileReader &getBBSPR();
+};
 
 } // namespace llvm
 #endif // LLVM_CODEGEN_BASICBLOCKSECTIONSPROFILEREADER_H

llvm/include/llvm/CodeGen/CodeGenPrepare.h

@@ -0,0 +1,35 @@
+//===- CodeGenPrepare.h -----------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+/// \file
+///
+/// Defines an IR pass for CodeGen Prepare.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CODEGEN_PREPARE_H
+#define LLVM_CODEGEN_PREPARE_H
+
+#include "llvm/IR/PassManager.h"
+
+namespace llvm {
+
+class Function;
+class TargetMachine;
+
+class CodeGenPreparePass : public PassInfoMixin<CodeGenPreparePass> {
+private:
+  const TargetMachine *TM;
+
+public:
+  CodeGenPreparePass(const TargetMachine *TM) : TM(TM) {}
+  PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);
+};
+
+} // end namespace llvm
+
+#endif // LLVM_CODEGEN_PREPARE_H

llvm/include/llvm/CodeGen/Passes.h

@@ -93,9 +93,9 @@ namespace llvm {
   MachineFunctionPass *createResetMachineFunctionPass(bool EmitFallbackDiag,
                                                       bool AbortOnFailedISel);
 
-  /// createCodeGenPreparePass - Transform the code to expose more pattern
+  /// createCodeGenPrepareLegacyPass - Transform the code to expose more pattern
   /// matching during instruction selection.
-  FunctionPass *createCodeGenPreparePass();
+  FunctionPass *createCodeGenPrepareLegacyPass();
 
   /// This pass implements generation of target-specific intrinsics to support
   /// handling of complex number arithmetic

llvm/include/llvm/InitializePasses.h

@@ -54,7 +54,7 @@ void initializeAssignmentTrackingAnalysisPass(PassRegistry &);
 void initializeAssumptionCacheTrackerPass(PassRegistry&);
 void initializeAtomicExpandPass(PassRegistry&);
 void initializeBasicBlockPathCloningPass(PassRegistry &);
-void initializeBasicBlockSectionsProfileReaderPass(PassRegistry &);
+void initializeBasicBlockSectionsProfileReaderWrapperPassPass(PassRegistry &);
 void initializeBasicBlockSectionsPass(PassRegistry &);
 void initializeBarrierNoopPass(PassRegistry&);
 void initializeBasicAAWrapperPassPass(PassRegistry&);
@@ -75,7 +75,7 @@ void initializeCallGraphDOTPrinterPass(PassRegistry&);
 void initializeCallGraphViewerPass(PassRegistry&);
 void initializeCallGraphWrapperPassPass(PassRegistry&);
 void initializeCheckDebugMachineModulePass(PassRegistry &);
-void initializeCodeGenPreparePass(PassRegistry&);
+void initializeCodeGenPrepareLegacyPassPass(PassRegistry &);
 void initializeComplexDeinterleavingLegacyPassPass(PassRegistry&);
 void initializeConstantHoistingLegacyPassPass(PassRegistry&);
 void initializeCycleInfoWrapperPassPass(PassRegistry &);

llvm/include/llvm/LinkAllPasses.h

@@ -113,7 +113,7 @@ namespace {
       (void) llvm::createTailCallEliminationPass();
       (void)llvm::createTLSVariableHoistPass();
       (void) llvm::createConstantHoistingPass();
-      (void) llvm::createCodeGenPreparePass();
+      (void)llvm::createCodeGenPrepareLegacyPass();
       (void) llvm::createEarlyCSEPass();
       (void) llvm::createGVNPass();
       (void) llvm::createPostDomTree();

llvm/lib/CodeGen/BasicBlockPathCloning.cpp

@@ -196,7 +196,7 @@ class BasicBlockPathCloning : public MachineFunctionPass {
 public:
   static char ID;
 
-  BasicBlockSectionsProfileReader *BBSectionsProfileReader = nullptr;
+  BasicBlockSectionsProfileReaderWrapperPass *BBSectionsProfileReader = nullptr;
 
   BasicBlockPathCloning() : MachineFunctionPass(ID) {
     initializeBasicBlockPathCloningPass(*PassRegistry::getPassRegistry());
@@ -218,7 +218,7 @@ INITIALIZE_PASS_BEGIN(
     BasicBlockPathCloning, "bb-path-cloning",
     "Applies path clonings for the -basic-block-sections=list option", false,
     false)
-INITIALIZE_PASS_DEPENDENCY(BasicBlockSectionsProfileReader)
+INITIALIZE_PASS_DEPENDENCY(BasicBlockSectionsProfileReaderWrapperPass)
 INITIALIZE_PASS_END(
     BasicBlockPathCloning, "bb-path-cloning",
     "Applies path clonings for the -basic-block-sections=list option", false,
@@ -230,13 +230,14 @@ bool BasicBlockPathCloning::runOnMachineFunction(MachineFunction &MF) {
   if (hasInstrProfHashMismatch(MF))
     return false;
 
-  return ApplyCloning(MF, getAnalysis<BasicBlockSectionsProfileReader>()
-                              .getClonePathsForFunction(MF.getName()));
+  return ApplyCloning(MF,
+                      getAnalysis<BasicBlockSectionsProfileReaderWrapperPass>()
+                          .getClonePathsForFunction(MF.getName()));
 }
 
 void BasicBlockPathCloning::getAnalysisUsage(AnalysisUsage &AU) const {
   AU.setPreservesAll();
-  AU.addRequired<BasicBlockSectionsProfileReader>();
+  AU.addRequired<BasicBlockSectionsProfileReaderWrapperPass>();
   MachineFunctionPass::getAnalysisUsage(AU);
 }
 

llvm/lib/CodeGen/BasicBlockSections.cpp

@@ -103,7 +103,7 @@ class BasicBlockSections : public MachineFunctionPass {
 public:
   static char ID;
 
-  BasicBlockSectionsProfileReader *BBSectionsProfileReader = nullptr;
+  BasicBlockSectionsProfileReaderWrapperPass *BBSectionsProfileReader = nullptr;
 
   BasicBlockSections() : MachineFunctionPass(ID) {
     initializeBasicBlockSectionsPass(*PassRegistry::getPassRegistry());
@@ -128,7 +128,7 @@ INITIALIZE_PASS_BEGIN(
     "Prepares for basic block sections, by splitting functions "
     "into clusters of basic blocks.",
     false, false)
-INITIALIZE_PASS_DEPENDENCY(BasicBlockSectionsProfileReader)
+INITIALIZE_PASS_DEPENDENCY(BasicBlockSectionsProfileReaderWrapperPass)
 INITIALIZE_PASS_END(BasicBlockSections, "bbsections-prepare",
                     "Prepares for basic block sections, by splitting functions "
                     "into clusters of basic blocks.",
@@ -306,7 +306,7 @@ bool BasicBlockSections::runOnMachineFunction(MachineFunction &MF) {
   DenseMap<UniqueBBID, BBClusterInfo> FuncClusterInfo;
   if (BBSectionsType == BasicBlockSection::List) {
     auto [HasProfile, ClusterInfo] =
-        getAnalysis<BasicBlockSectionsProfileReader>()
+        getAnalysis<BasicBlockSectionsProfileReaderWrapperPass>()
             .getClusterInfoForFunction(MF.getName());
     if (!HasProfile)
       return false;
@@ -362,7 +362,7 @@ bool BasicBlockSections::runOnMachineFunction(MachineFunction &MF) {
 
 void BasicBlockSections::getAnalysisUsage(AnalysisUsage &AU) const {
   AU.setPreservesAll();
-  AU.addRequired<BasicBlockSectionsProfileReader>();
+  AU.addRequired<BasicBlockSectionsProfileReaderWrapperPass>();
   MachineFunctionPass::getAnalysisUsage(AU);
 }
 

llvm/lib/CodeGen/BasicBlockSectionsProfileReader.cpp

@@ -30,8 +30,9 @@
 
 using namespace llvm;
 
-char BasicBlockSectionsProfileReader::ID = 0;
-INITIALIZE_PASS(BasicBlockSectionsProfileReader, "bbsections-profile-reader",
+char BasicBlockSectionsProfileReaderWrapperPass::ID = 0;
+INITIALIZE_PASS(BasicBlockSectionsProfileReaderWrapperPass,
+                "bbsections-profile-reader",
                 "Reads and parses a basic block sections profile.", false,
                 false)
 
@@ -395,11 +396,11 @@ Error BasicBlockSectionsProfileReader::ReadProfile() {
   }
 }
 
-bool BasicBlockSectionsProfileReader::doInitialization(Module &M) {
-  if (!MBuf)
+bool BasicBlockSectionsProfileReaderWrapperPass::doInitialization(Module &M) {
+  if (!BBSPR.MBuf)
     return false;
   // Get the function name to debug info filename mapping.
-  FunctionNameToDIFilename.clear();
+  BBSPR.FunctionNameToDIFilename.clear();
   for (const Function &F : M) {
     SmallString<128> DIFilename;
     if (F.isDeclaration())
@@ -411,15 +412,46 @@ bool BasicBlockSectionsProfileReader::doInitialization(Module &M) {
         DIFilename = sys::path::remove_leading_dotslash(CU->getFilename());
     }
     [[maybe_unused]] bool inserted =
-        FunctionNameToDIFilename.try_emplace(F.getName(), DIFilename).second;
+        BBSPR.FunctionNameToDIFilename.try_emplace(F.getName(), DIFilename)
+            .second;
     assert(inserted);
   }
-  if (auto Err = ReadProfile())
+  if (auto Err = BBSPR.ReadProfile())
     report_fatal_error(std::move(Err));
   return false;
 }
 
-ImmutablePass *
-llvm::createBasicBlockSectionsProfileReaderPass(const MemoryBuffer *Buf) {
-  return new BasicBlockSectionsProfileReader(Buf);
+AnalysisKey BasicBlockSectionsProfileReaderAnalysis::Key;
+
+BasicBlockSectionsProfileReader
+BasicBlockSectionsProfileReaderAnalysis::run(Function &F,
+                                             FunctionAnalysisManager &AM) {
+  return BasicBlockSectionsProfileReader(TM->getBBSectionsFuncListBuf());
+}
+
+bool BasicBlockSectionsProfileReaderWrapperPass::isFunctionHot(
+    StringRef FuncName) const {
+  return BBSPR.isFunctionHot(FuncName);
+}
+
+std::pair<bool, SmallVector<BBClusterInfo>>
+BasicBlockSectionsProfileReaderWrapperPass::getClusterInfoForFunction(
+    StringRef FuncName) const {
+  return BBSPR.getClusterInfoForFunction(FuncName);
+}
+
+SmallVector<SmallVector<unsigned>>
+BasicBlockSectionsProfileReaderWrapperPass::getClonePathsForFunction(
+    StringRef FuncName) const {
+  return BBSPR.getClonePathsForFunction(FuncName);
+}
+
+BasicBlockSectionsProfileReader &
+BasicBlockSectionsProfileReaderWrapperPass::getBBSPR() {
+  return BBSPR;
+}
+
+ImmutablePass *llvm::createBasicBlockSectionsProfileReaderWrapperPass(
+    const MemoryBuffer *Buf) {
+  return new BasicBlockSectionsProfileReaderWrapperPass(Buf);
 }

llvm/lib/CodeGen/CodeGen.cpp

@@ -30,7 +30,7 @@ void llvm::initializeCodeGen(PassRegistry &Registry) {
   initializeCFIFixupPass(Registry);
   initializeCFIInstrInserterPass(Registry);
   initializeCheckDebugMachineModulePass(Registry);
-  initializeCodeGenPreparePass(Registry);
+  initializeCodeGenPrepareLegacyPassPass(Registry);
   initializeDeadMachineInstructionElimPass(Registry);
   initializeDebugifyMachineModulePass(Registry);
   initializeDetectDeadLanesPass(Registry);