Convert SampleProfile pass into a Module pass.

Eventually, we will need sample profiles to be incorporated into the
inliner's cost models.  To do this, we need the sample profile pass to
be a module pass.

This patch makes no functional changes beyond the mechanical adjustments
needed to run SampleProfile as a module pass.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@245940 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Transforms/IPO.h

@@ -16,6 +16,7 @@
 #define LLVM_TRANSFORMS_IPO_H
 
 #include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/StringRef.h"
 
 namespace llvm {
 
@@ -209,6 +210,12 @@ ModulePass *createBarrierNoopPass();
 /// to bitsets.
 ModulePass *createLowerBitSetsPass();
 
+//===----------------------------------------------------------------------===//
+// SampleProfilePass - Loads sample profile data from disk and generates
+// IR metadata to reflect the profile.
+ModulePass *createSampleProfileLoaderPass();
+ModulePass *createSampleProfileLoaderPass(StringRef Name);
+
 } // End llvm namespace
 
 #endif

include/llvm/Transforms/Scalar.h

@@ -406,13 +406,6 @@ FunctionPass *createLowerExpectIntrinsicPass();
 //
 FunctionPass *createPartiallyInlineLibCallsPass();
 
-//===----------------------------------------------------------------------===//
-//
-// SampleProfilePass - Loads sample profile data from disk and generates
-// IR metadata to reflect the profile.
-FunctionPass *createSampleProfileLoaderPass();
-FunctionPass *createSampleProfileLoaderPass(StringRef Name);
-
 //===----------------------------------------------------------------------===//
 //
 // ScalarizerPass - Converts vector operations into scalar operations

lib/Transforms/IPO/CMakeLists.txt

@@ -20,6 +20,7 @@ add_llvm_library(LLVMipo
   PartialInlining.cpp
   PassManagerBuilder.cpp
   PruneEH.cpp
+  SampleProfile.cpp
   StripDeadPrototypes.cpp
   StripSymbols.cpp
 

lib/Transforms/IPO/IPO.cpp

@@ -47,6 +47,7 @@ void llvm::initializeIPO(PassRegistry &Registry) {
   initializeStripNonDebugSymbolsPass(Registry);
   initializeBarrierNoopPass(Registry);
   initializeEliminateAvailableExternallyPass(Registry);
+  initializeSampleProfileLoaderPass(Registry);
 }
 
 void LLVMInitializeIPO(LLVMPassRegistryRef R) {

lib/Transforms/IPO/SampleProfile.cpp

@@ -22,7 +22,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "llvm/Transforms/Scalar.h"
 #include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/SmallPtrSet.h"
 #include "llvm/ADT/SmallSet.h"
@@ -45,6 +44,7 @@
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/raw_ostream.h"
+#include "llvm/Transforms/IPO.h"
 #include <cctype>
 
 using namespace llvm;
@@ -74,14 +74,15 @@ typedef DenseMap<BasicBlock *, SmallVector<BasicBlock *, 8>> BlockEdgeMap;
 /// This pass reads profile data from the file specified by
 /// -sample-profile-file and annotates every affected function with the
 /// profile information found in that file.
-class SampleProfileLoader : public FunctionPass {
+class SampleProfileLoader : public ModulePass {
 public:
   // Class identification, replacement for typeinfo
   static char ID;
 
   SampleProfileLoader(StringRef Name = SampleProfileFile)
-      : FunctionPass(ID), DT(nullptr), PDT(nullptr), LI(nullptr), Ctx(nullptr),
-        Reader(), Samples(nullptr), Filename(Name), ProfileIsValid(false) {
+      : ModulePass(ID), DT(nullptr), PDT(nullptr), LI(nullptr),
+        Ctx(nullptr), Reader(), Samples(nullptr), Filename(Name),
+        ProfileIsValid(false) {
     initializeSampleProfileLoaderPass(*PassRegistry::getPassRegistry());
   }
 
@@ -91,16 +92,23 @@ public:
 
   const char *getPassName() const override { return "Sample profile pass"; }
 
-  bool runOnFunction(Function &F) override;
+  bool runOnModule(Module &M) override;
 
   void getAnalysisUsage(AnalysisUsage &AU) const override {
     AU.setPreservesCFG();
+
     AU.addRequired<LoopInfoWrapperPass>();
+    AU.addPreserved<LoopInfoWrapperPass>();
+
     AU.addRequired<DominatorTreeWrapperPass>();
+    AU.addPreserved<DominatorTreeWrapperPass>();
+
     AU.addRequired<PostDominatorTree>();
+    AU.addPreserved<PostDominatorTree>();
   }
 
 protected:
+  bool runOnFunction(Function &F);
   unsigned getFunctionLoc(Function &F);
   bool emitAnnotations(Function &F);
   unsigned getInstWeight(Instruction &I);
@@ -743,10 +751,11 @@ INITIALIZE_PASS_END(SampleProfileLoader, "sample-profile",
                     "Sample Profile loader", false, false)
 
 bool SampleProfileLoader::doInitialization(Module &M) {
-  auto ReaderOrErr = SampleProfileReader::create(Filename, M.getContext());
+  auto& Ctx = M.getContext();
+  auto ReaderOrErr = SampleProfileReader::create(Filename, Ctx);
   if (std::error_code EC = ReaderOrErr.getError()) {
     std::string Msg = "Could not open profile: " + EC.message();
-    M.getContext().diagnose(DiagnosticInfoSampleProfile(Filename.data(), Msg));
+    Ctx.diagnose(DiagnosticInfoSampleProfile(Filename.data(), Msg));
     return false;
   }
   Reader = std::move(ReaderOrErr.get());
@@ -754,21 +763,29 @@ bool SampleProfileLoader::doInitialization(Module &M) {
   return true;
 }
 
-FunctionPass *llvm::createSampleProfileLoaderPass() {
+ModulePass *llvm::createSampleProfileLoaderPass() {
   return new SampleProfileLoader(SampleProfileFile);
 }
 
-FunctionPass *llvm::createSampleProfileLoaderPass(StringRef Name) {
+ModulePass *llvm::createSampleProfileLoaderPass(StringRef Name) {
   return new SampleProfileLoader(Name);
 }
 
+bool SampleProfileLoader::runOnModule(Module &M) {
+  bool retval = false;
+  for (auto &F : M)
+    if (!F.isDeclaration())
+      retval |= runOnFunction(F);
+  return retval;
+}
+
 bool SampleProfileLoader::runOnFunction(Function &F) {
   if (!ProfileIsValid)
     return false;
 
-  DT = &getAnalysis<DominatorTreeWrapperPass>().getDomTree();
-  PDT = &getAnalysis<PostDominatorTree>();
-  LI = &getAnalysis<LoopInfoWrapperPass>().getLoopInfo();
+  DT = &getAnalysis<DominatorTreeWrapperPass>(F).getDomTree();
+  PDT = &getAnalysis<PostDominatorTree>(F);
+  LI = &getAnalysis<LoopInfoWrapperPass>(F).getLoopInfo();
   Ctx = &F.getParent()->getContext();
   Samples = Reader->getSamplesFor(F);
   if (!Samples->empty())

lib/Transforms/Scalar/CMakeLists.txt

@@ -38,7 +38,6 @@ add_llvm_library(LLVMScalarOpts
   RewriteStatepointsForGC.cpp
   SCCP.cpp
   SROA.cpp
-  SampleProfile.cpp
   Scalar.cpp
   ScalarReplAggregates.cpp
   Scalarizer.cpp

lib/Transforms/Scalar/Scalar.cpp

@@ -33,7 +33,6 @@ void llvm::initializeScalarOpts(PassRegistry &Registry) {
   initializeADCEPass(Registry);
   initializeBDCEPass(Registry);
   initializeAlignmentFromAssumptionsPass(Registry);
-  initializeSampleProfileLoaderPass(Registry);
   initializeConstantHoistingPass(Registry);
   initializeConstantPropagationPass(Registry);
   initializeCorrelatedValuePropagationPass(Registry);