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//===- AlwaysInliner.cpp - Code to inline always_inline functions ----------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// This file implements a custom inliner that handles only functions that
// are marked as "always inline".
//
//===----------------------------------------------------------------------===//
#include "llvm/Transforms/IPO/AlwaysInliner.h"
#include "llvm/ADT/SetVector.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/Analysis/AssumptionCache.h"
#include "llvm/Analysis/InlineAdvisor.h"
#include "llvm/Analysis/InlineCost.h"
#include "llvm/Analysis/OptimizationRemarkEmitter.h"
#include "llvm/Analysis/ProfileSummaryInfo.h"
#include "llvm/IR/Module.h"
#include "llvm/InitializePasses.h"
#include "llvm/Transforms/Utils/Cloning.h"
#include "llvm/Transforms/Utils/ModuleUtils.h"
using namespace llvm;
#define DEBUG_TYPE "inline"
namespace {
bool AlwaysInlineImpl(
Module &M, bool InsertLifetime, ProfileSummaryInfo &PSI,
function_ref<AssumptionCache &(Function &)> GetAssumptionCache,
function_ref<AAResults &(Function &)> GetAAR,
function_ref<BlockFrequencyInfo &(Function &)> GetBFI) {
SmallSetVector<CallBase *, 16> Calls;
bool Changed = false;
SmallVector<Function *, 16> InlinedComdatFunctions;
for (Function &F : make_early_inc_range(M)) {
if (F.isPresplitCoroutine())
continue;
if (F.isDeclaration() || !isInlineViable(F).isSuccess())
continue;
Calls.clear();
for (User *U : F.users())
if (auto *CB = dyn_cast<CallBase>(U))
if (CB->getCalledFunction() == &F &&
CB->hasFnAttr(Attribute::AlwaysInline) &&
!CB->getAttributes().hasFnAttr(Attribute::NoInline))
Calls.insert(CB);
for (CallBase *CB : Calls) {
Function *Caller = CB->getCaller();
OptimizationRemarkEmitter ORE(Caller);
DebugLoc DLoc = CB->getDebugLoc();
BasicBlock *Block = CB->getParent();
InlineFunctionInfo IFI(GetAssumptionCache, &PSI,
GetBFI ? &GetBFI(*Caller) : nullptr,
GetBFI ? &GetBFI(F) : nullptr);
InlineResult Res = InlineFunction(*CB, IFI, /*MergeAttributes=*/true,
&GetAAR(F), InsertLifetime);
if (!Res.isSuccess()) {
ORE.emit([&]() {
return OptimizationRemarkMissed(DEBUG_TYPE, "NotInlined", DLoc, Block)
<< "'" << ore::NV("Callee", &F) << "' is not inlined into '"
<< ore::NV("Caller", Caller)
<< "': " << ore::NV("Reason", Res.getFailureReason());
});
continue;
}
emitInlinedIntoBasedOnCost(
ORE, DLoc, Block, F, *Caller,
InlineCost::getAlways("always inline attribute"),
/*ForProfileContext=*/false, DEBUG_TYPE);
Changed = true;
}
F.removeDeadConstantUsers();
if (F.hasFnAttribute(Attribute::AlwaysInline) && F.isDefTriviallyDead()) {
// Remember to try and delete this function afterward. This allows to call
// filterDeadComdatFunctions() only once.
if (F.hasComdat()) {
InlinedComdatFunctions.push_back(&F);
} else {
M.getFunctionList().erase(F);
Changed = true;
}
}
}
if (!InlinedComdatFunctions.empty()) {
// Now we just have the comdat functions. Filter out the ones whose comdats
// are not actually dead.
filterDeadComdatFunctions(InlinedComdatFunctions);
// The remaining functions are actually dead.
for (Function *F : InlinedComdatFunctions) {
M.getFunctionList().erase(F);
Changed = true;
}
}
return Changed;
}
struct AlwaysInlinerLegacyPass : public ModulePass {
bool InsertLifetime;
AlwaysInlinerLegacyPass()
: AlwaysInlinerLegacyPass(/*InsertLifetime*/ true) {}
AlwaysInlinerLegacyPass(bool InsertLifetime)
: ModulePass(ID), InsertLifetime(InsertLifetime) {
initializeAlwaysInlinerLegacyPassPass(*PassRegistry::getPassRegistry());
}
/// Main run interface method. We override here to avoid calling skipSCC().
bool runOnModule(Module &M) override {
auto &PSI = getAnalysis<ProfileSummaryInfoWrapperPass>().getPSI();
auto GetAAR = [&](Function &F) -> AAResults & {
return getAnalysis<AAResultsWrapperPass>(F).getAAResults();
};
auto GetAssumptionCache = [&](Function &F) -> AssumptionCache & {
return getAnalysis<AssumptionCacheTracker>().getAssumptionCache(F);
};
return AlwaysInlineImpl(M, InsertLifetime, PSI, GetAssumptionCache, GetAAR,
/*GetBFI*/ nullptr);
}
static char ID; // Pass identification, replacement for typeid
void getAnalysisUsage(AnalysisUsage &AU) const override {
AU.addRequired<AssumptionCacheTracker>();
AU.addRequired<AAResultsWrapperPass>();
AU.addRequired<ProfileSummaryInfoWrapperPass>();
}
};
} // namespace
char AlwaysInlinerLegacyPass::ID = 0;
INITIALIZE_PASS_BEGIN(AlwaysInlinerLegacyPass, "always-inline",
"Inliner for always_inline functions", false, false)
INITIALIZE_PASS_DEPENDENCY(AAResultsWrapperPass)
INITIALIZE_PASS_DEPENDENCY(AssumptionCacheTracker)
INITIALIZE_PASS_DEPENDENCY(ProfileSummaryInfoWrapperPass)
INITIALIZE_PASS_END(AlwaysInlinerLegacyPass, "always-inline",
"Inliner for always_inline functions", false, false)
Pass *llvm::createAlwaysInlinerLegacyPass(bool InsertLifetime) {
return new AlwaysInlinerLegacyPass(InsertLifetime);
}
PreservedAnalyses AlwaysInlinerPass::run(Module &M,
ModuleAnalysisManager &MAM) {
FunctionAnalysisManager &FAM =
MAM.getResult<FunctionAnalysisManagerModuleProxy>(M).getManager();
auto GetAssumptionCache = [&](Function &F) -> AssumptionCache & {
return FAM.getResult<AssumptionAnalysis>(F);
};
auto GetBFI = [&](Function &F) -> BlockFrequencyInfo & {
return FAM.getResult<BlockFrequencyAnalysis>(F);
};
auto GetAAR = [&](Function &F) -> AAResults & {
return FAM.getResult<AAManager>(F);
};
auto &PSI = MAM.getResult<ProfileSummaryAnalysis>(M);
bool Changed = AlwaysInlineImpl(M, InsertLifetime, PSI, GetAssumptionCache,
GetAAR, GetBFI);
return Changed ? PreservedAnalyses::none() : PreservedAnalyses::all();
}
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