Analysis: Add RuntimeLibcall analysis pass

llvm/include/llvm/Analysis/RuntimeLibcallInfo.h

@@ -0,0 +1,60 @@
+//===-- RuntimeLibcallInfo.h - Runtime library information ------*- 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
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_ANALYSIS_RUNTIMELIBCALLINFO_H
+#define LLVM_ANALYSIS_RUNTIMELIBCALLINFO_H
+
+#include "llvm/IR/RuntimeLibcalls.h"
+#include "llvm/Pass.h"
+
+namespace llvm {
+
+class LLVM_ABI RuntimeLibraryAnalysis
+    : public AnalysisInfoMixin<RuntimeLibraryAnalysis> {
+public:
+  using Result = RTLIB::RuntimeLibcallsInfo;
+
+  RuntimeLibraryAnalysis() = default;
+  RuntimeLibraryAnalysis(RTLIB::RuntimeLibcallsInfo &&BaselineInfoImpl)
+      : LibcallsInfo(std::move(BaselineInfoImpl)) {}
+  explicit RuntimeLibraryAnalysis(const Triple &T) : LibcallsInfo(T) {}
+
+  LLVM_ABI RTLIB::RuntimeLibcallsInfo run(const Module &M,
+                                          ModuleAnalysisManager &);
+
+private:
+  friend AnalysisInfoMixin<RuntimeLibraryAnalysis>;
+  LLVM_ABI static AnalysisKey Key;
+
+  RTLIB::RuntimeLibcallsInfo LibcallsInfo;
+};
+
+class LLVM_ABI RuntimeLibraryInfoWrapper : public ImmutablePass {
+  RuntimeLibraryAnalysis RTLA;
+  std::optional<RTLIB::RuntimeLibcallsInfo> RTLCI;
+
+public:
+  static char ID;
+  RuntimeLibraryInfoWrapper();
+  explicit RuntimeLibraryInfoWrapper(const Triple &T);
+  explicit RuntimeLibraryInfoWrapper(const RTLIB::RuntimeLibcallsInfo &RTLCI);
+
+  const RTLIB::RuntimeLibcallsInfo &getRTLCI(const Module &M) {
+    ModuleAnalysisManager DummyMAM;
+    RTLCI = RTLA.run(M, DummyMAM);
+    return *RTLCI;
+  }
+
+  void getAnalysisUsage(AnalysisUsage &AU) const override;
+};
+
+LLVM_ABI ModulePass *createRuntimeLibraryInfoWrapperPass();
+
+} // namespace llvm
+
+#endif

llvm/include/llvm/CodeGen/SelectionDAGISel.h

@@ -46,6 +46,7 @@ class SelectionDAGISel {
 public:
   TargetMachine &TM;
   const TargetLibraryInfo *LibInfo;
+  const RTLIB::RuntimeLibcallsInfo *RuntimeLibCallInfo;
   std::unique_ptr<FunctionLoweringInfo> FuncInfo;
   std::unique_ptr<SwiftErrorValueTracking> SwiftError;
   MachineFunction *MF;

llvm/include/llvm/IR/RuntimeLibcalls.h

@@ -9,6 +9,8 @@
 // This file implements a common interface to work with library calls into a
 // runtime that may be emitted by a given backend.
 //
+// FIXME: This should probably move to Analysis
+//
 //===----------------------------------------------------------------------===//
 
 #ifndef LLVM_IR_RUNTIME_LIBCALLS_H
@@ -20,6 +22,7 @@
 #include "llvm/ADT/StringTable.h"
 #include "llvm/IR/CallingConv.h"
 #include "llvm/IR/InstrTypes.h"
+#include "llvm/IR/PassManager.h"
 #include "llvm/Support/AtomicOrdering.h"
 #include "llvm/Support/CodeGen.h"
 #include "llvm/Support/Compiler.h"
@@ -74,6 +77,8 @@ struct RuntimeLibcallsInfo {
 public:
   friend class llvm::LibcallLoweringInfo;
 
+  RuntimeLibcallsInfo() = default;
+
   explicit RuntimeLibcallsInfo(
       const Triple &TT,
       ExceptionHandling ExceptionModel = ExceptionHandling::None,
@@ -89,6 +94,11 @@ struct RuntimeLibcallsInfo {
     initLibcalls(TT, ExceptionModel, FloatABI, EABIVersion, ABIName);
   }
 
+  explicit RuntimeLibcallsInfo(const Module &M);
+
+  bool invalidate(Module &M, const PreservedAnalyses &PA,
+                  ModuleAnalysisManager::Invalidator &);
+
   /// Get the libcall routine name for the specified libcall implementation.
   static StringRef getLibcallImplName(RTLIB::LibcallImpl CallImpl) {
     if (CallImpl == RTLIB::Unsupported)

llvm/include/llvm/InitializePasses.h

@@ -290,6 +290,7 @@ LLVM_ABI void initializeRemoveRedundantDebugValuesLegacyPass(PassRegistry &);
 LLVM_ABI void initializeRenameIndependentSubregsLegacyPass(PassRegistry &);
 LLVM_ABI void initializeReplaceWithVeclibLegacyPass(PassRegistry &);
 LLVM_ABI void initializeResetMachineFunctionPass(PassRegistry &);
+LLVM_ABI void initializeRuntimeLibraryInfoWrapperPass(PassRegistry &);
 LLVM_ABI void initializeSCEVAAWrapperPassPass(PassRegistry &);
 LLVM_ABI void initializeSROALegacyPassPass(PassRegistry &);
 LLVM_ABI void initializeSafeStackLegacyPassPass(PassRegistry &);

llvm/include/llvm/Passes/CodeGenPassBuilder.h

@@ -20,6 +20,7 @@
 #include "llvm/Analysis/BasicAliasAnalysis.h"
 #include "llvm/Analysis/CGSCCPassManager.h"
 #include "llvm/Analysis/ProfileSummaryInfo.h"
+#include "llvm/Analysis/RuntimeLibcallInfo.h"
 #include "llvm/Analysis/ScopedNoAliasAA.h"
 #include "llvm/Analysis/TargetTransformInfo.h"
 #include "llvm/Analysis/TypeBasedAliasAnalysis.h"
@@ -638,6 +639,8 @@ Error CodeGenPassBuilder<Derived, TargetMachineT>::buildPipeline(
               /*Force=*/true);
     addIRPass(RequireAnalysisPass<CollectorMetadataAnalysis, Module>(),
               /*Force=*/true);
+    addIRPass(RequireAnalysisPass<RuntimeLibraryAnalysis, Module>(),
+              /*Force=*/true);
     addISelPasses(addIRPass);
   }
 

llvm/lib/Analysis/Analysis.cpp

@@ -63,6 +63,7 @@ void llvm::initializeAnalysis(PassRegistry &Registry) {
   initializeRegionPrinterPass(Registry);
   initializeRegionOnlyViewerPass(Registry);
   initializeRegionOnlyPrinterPass(Registry);
+  initializeRuntimeLibraryInfoWrapperPass(Registry);
   initializeSCEVAAWrapperPassPass(Registry);
   initializeScalarEvolutionWrapperPassPass(Registry);
   initializeStackSafetyGlobalInfoWrapperPassPass(Registry);

llvm/lib/Analysis/CMakeLists.txt

@@ -137,6 +137,7 @@ add_llvm_component_library(LLVMAnalysis
   RegionPass.cpp
   RegionPrinter.cpp
   ReplayInlineAdvisor.cpp
+  RuntimeLibcallInfo.cpp
   ScalarEvolution.cpp
   ScalarEvolutionAliasAnalysis.cpp
   ScalarEvolutionDivision.cpp

llvm/lib/Analysis/RuntimeLibcallInfo.cpp

@@ -0,0 +1,43 @@
+//===- RuntimeLibcallInfo.cpp ---------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Analysis/RuntimeLibcallInfo.h"
+#include "llvm/InitializePasses.h"
+
+using namespace llvm;
+
+AnalysisKey RuntimeLibraryAnalysis::Key;
+
+RTLIB::RuntimeLibcallsInfo
+RuntimeLibraryAnalysis::run(const Module &M, ModuleAnalysisManager &) {
+  return RTLIB::RuntimeLibcallsInfo(M);
+}
+
+INITIALIZE_PASS(RuntimeLibraryInfoWrapper, "runtime-library-info",
+                "Runtime Library Function Analysis", false, true)
+
+RuntimeLibraryInfoWrapper::RuntimeLibraryInfoWrapper()
+    : ImmutablePass(ID), RTLA(RTLIB::RuntimeLibcallsInfo(Triple())) {}
+
+char RuntimeLibraryInfoWrapper::ID = 0;
+
+ModulePass *llvm::createRuntimeLibraryInfoWrapperPass() {
+  return new RuntimeLibraryInfoWrapper();
+}
+
+void RuntimeLibraryInfoWrapper::getAnalysisUsage(AnalysisUsage &AU) const {
+  AU.setPreservesAll();
+}
+
+// Assume this is stable unless explicitly invalidated.
+bool RTLIB::RuntimeLibcallsInfo::invalidate(
+    Module &M, const PreservedAnalyses &PA,
+    ModuleAnalysisManager::Invalidator &) {
+  auto PAC = PA.getChecker<RuntimeLibraryAnalysis>();
+  return !PAC.preservedWhenStateless();
+}

llvm/lib/IR/RuntimeLibcalls.cpp

@@ -9,7 +9,7 @@
 #include "llvm/IR/RuntimeLibcalls.h"
 #include "llvm/ADT/FloatingPointMode.h"
 #include "llvm/ADT/StringTable.h"
-#include "llvm/IR/DataLayout.h"
+#include "llvm/IR/Module.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/xxhash.h"
 #include "llvm/TargetParser/ARMTargetParser.h"
@@ -25,6 +25,11 @@ using namespace RTLIB;
 #define DEFINE_GET_LOOKUP_LIBCALL_IMPL_NAME
 #include "llvm/IR/RuntimeLibcalls.inc"
 
+RuntimeLibcallsInfo::RuntimeLibcallsInfo(const Module &M)
+    : RuntimeLibcallsInfo(M.getTargetTriple()) {
+  // TODO: Consider module flags
+}
+
 /// Set default libcall names. If a target wants to opt-out of a libcall it
 /// should be placed here.
 void RuntimeLibcallsInfo::initLibcalls(const Triple &TT,

llvm/lib/Passes/PassBuilder.cpp

@@ -67,6 +67,7 @@
 #include "llvm/Analysis/PostDominators.h"
 #include "llvm/Analysis/ProfileSummaryInfo.h"
 #include "llvm/Analysis/RegionInfo.h"
+#include "llvm/Analysis/RuntimeLibcallInfo.h"
 #include "llvm/Analysis/ScalarEvolution.h"
 #include "llvm/Analysis/ScalarEvolutionAliasAnalysis.h"
 #include "llvm/Analysis/ScalarEvolutionDivision.h"

llvm/lib/Passes/PassRegistry.def

@@ -35,6 +35,7 @@ MODULE_ANALYSIS("no-op-module", NoOpModuleAnalysis())
 MODULE_ANALYSIS("pass-instrumentation", PassInstrumentationAnalysis(PIC))
 MODULE_ANALYSIS("profile-summary", ProfileSummaryAnalysis())
 MODULE_ANALYSIS("reg-usage", PhysicalRegisterUsageAnalysis())
+MODULE_ANALYSIS("runtime-libcall-info", RuntimeLibraryAnalysis())
 MODULE_ANALYSIS("stack-safety", StackSafetyGlobalAnalysis())
 MODULE_ANALYSIS("verify", VerifierAnalysis())
 

llvm/lib/Target/Target.cpp

@@ -37,6 +37,7 @@ inline LLVMTargetLibraryInfoRef wrap(const TargetLibraryInfoImpl *P) {
 
 void llvm::initializeTarget(PassRegistry &Registry) {
   initializeTargetLibraryInfoWrapperPassPass(Registry);
+  initializeRuntimeLibraryInfoWrapperPass(Registry);
   initializeTargetTransformInfoWrapperPassPass(Registry);
 }