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//===- PassManager.cpp - Infrastructure for managing & running IR passes --===//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
#include "llvm/IR/PassManager.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/PassManagerImpl.h"
using namespace llvm;
// Explicit template instantiations and specialization defininitions for core
// template typedefs.
namespace llvm {
template class AllAnalysesOn<Module>;
template class AllAnalysesOn<Function>;
template class PassManager<Module>;
template class PassManager<Function>;
template class AnalysisManager<Module>;
template class AnalysisManager<Function>;
template class InnerAnalysisManagerProxy<FunctionAnalysisManager, Module>;
template class OuterAnalysisManagerProxy<ModuleAnalysisManager, Function>;
template <>
bool FunctionAnalysisManagerModuleProxy::Result::invalidate(
Module &M, const PreservedAnalyses &PA,
ModuleAnalysisManager::Invalidator &Inv) {
// If literally everything is preserved, we're done.
if (PA.areAllPreserved())
return false; // This is still a valid proxy.
// If this proxy isn't marked as preserved, then even if the result remains
// valid, the key itself may no longer be valid, so we clear everything.
// Note that in order to preserve this proxy, a module pass must ensure that
// the FAM has been completely updated to handle the deletion of functions.
// Specifically, any FAM-cached results for those functions need to have been
// forcibly cleared. When preserved, this proxy will only invalidate results
// cached on functions *still in the module* at the end of the module pass.
auto PAC = PA.getChecker<FunctionAnalysisManagerModuleProxy>();
if (!PAC.preserved() && !PAC.preservedSet<AllAnalysesOn<Module>>()) {
return true;
// Directly check if the relevant set is preserved.
bool AreFunctionAnalysesPreserved =
// Now walk all the functions to see if any inner analysis invalidation is
// necessary.
for (Function &F : M) {
Optional<PreservedAnalyses> FunctionPA;
// Check to see whether the preserved set needs to be pruned based on
// module-level analysis invalidation that triggers deferred invalidation
// registered with the outer analysis manager proxy for this function.
if (auto *OuterProxy =
for (const auto &OuterInvalidationPair :
OuterProxy->getOuterInvalidations()) {
AnalysisKey *OuterAnalysisID = OuterInvalidationPair.first;
const auto &InnerAnalysisIDs = OuterInvalidationPair.second;
if (Inv.invalidate(OuterAnalysisID, M, PA)) {
if (!FunctionPA)
FunctionPA = PA;
for (AnalysisKey *InnerAnalysisID : InnerAnalysisIDs)
// Check if we needed a custom PA set, and if so we'll need to run the
// inner invalidation.
if (FunctionPA) {
InnerAM->invalidate(F, *FunctionPA);
// Otherwise we only need to do invalidation if the original PA set didn't
// preserve all function analyses.
if (!AreFunctionAnalysesPreserved)
InnerAM->invalidate(F, PA);
// Return false to indicate that this result is still a valid proxy.
return false;
} // namespace llvm
PreservedAnalyses ModuleToFunctionPassAdaptor::run(Module &M,
ModuleAnalysisManager &AM) {
FunctionAnalysisManager &FAM =
// Request PassInstrumentation from analysis manager, will use it to run
// instrumenting callbacks for the passes later.
PassInstrumentation PI = AM.getResult<PassInstrumentationAnalysis>(M);
PreservedAnalyses PA = PreservedAnalyses::all();
for (Function &F : M) {
if (F.isDeclaration())
// Check the PassInstrumentation's BeforePass callbacks before running the
// pass, skip its execution completely if asked to (callback returns
// false).
if (!PI.runBeforePass<Function>(*Pass, F))
PreservedAnalyses PassPA;
TimeTraceScope TimeScope(Pass->name(), F.getName());
PassPA = Pass->run(F, FAM);
PI.runAfterPass(*Pass, F, PassPA);
// We know that the function pass couldn't have invalidated any other
// function's analyses (that's the contract of a function pass), so
// directly handle the function analysis manager's invalidation here.
FAM.invalidate(F, PassPA);
// Then intersect the preserved set so that invalidation of module
// analyses will eventually occur when the module pass completes.
// The FunctionAnalysisManagerModuleProxy is preserved because (we assume)
// the function passes we ran didn't add or remove any functions.
// We also preserve all analyses on Functions, because we did all the
// invalidation we needed to do above.
return PA;
AnalysisSetKey CFGAnalyses::SetKey;
AnalysisSetKey PreservedAnalyses::AllAnalysesKey;