1 //===- ModuleSummaryAnalysis.cpp - Module summary index builder -----------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This pass builds a ModuleSummaryIndex object for the module, to be written
11 // to bitcode or LLVM assembly.
13 //===----------------------------------------------------------------------===//
15 #include "llvm/Analysis/ModuleSummaryAnalysis.h"
16 #include "llvm/ADT/ArrayRef.h"
17 #include "llvm/ADT/DenseSet.h"
18 #include "llvm/ADT/MapVector.h"
19 #include "llvm/ADT/STLExtras.h"
20 #include "llvm/ADT/SetVector.h"
21 #include "llvm/ADT/SmallPtrSet.h"
22 #include "llvm/ADT/SmallVector.h"
23 #include "llvm/ADT/StringRef.h"
24 #include "llvm/Analysis/BlockFrequencyInfo.h"
25 #include "llvm/Analysis/BranchProbabilityInfo.h"
26 #include "llvm/Analysis/IndirectCallPromotionAnalysis.h"
27 #include "llvm/Analysis/LoopInfo.h"
28 #include "llvm/Analysis/ProfileSummaryInfo.h"
29 #include "llvm/Analysis/TypeMetadataUtils.h"
30 #include "llvm/IR/Attributes.h"
31 #include "llvm/IR/BasicBlock.h"
32 #include "llvm/IR/CallSite.h"
33 #include "llvm/IR/Constant.h"
34 #include "llvm/IR/Constants.h"
35 #include "llvm/IR/Dominators.h"
36 #include "llvm/IR/Function.h"
37 #include "llvm/IR/GlobalAlias.h"
38 #include "llvm/IR/GlobalValue.h"
39 #include "llvm/IR/GlobalVariable.h"
40 #include "llvm/IR/Instructions.h"
41 #include "llvm/IR/IntrinsicInst.h"
42 #include "llvm/IR/Intrinsics.h"
43 #include "llvm/IR/Metadata.h"
44 #include "llvm/IR/Module.h"
45 #include "llvm/IR/ModuleSummaryIndex.h"
46 #include "llvm/IR/Use.h"
47 #include "llvm/IR/User.h"
48 #include "llvm/Object/ModuleSymbolTable.h"
49 #include "llvm/Object/SymbolicFile.h"
50 #include "llvm/Pass.h"
51 #include "llvm/Support/Casting.h"
59 #define DEBUG_TYPE "module-summary-analysis"
61 // Walk through the operands of a given User via worklist iteration and populate
62 // the set of GlobalValue references encountered. Invoked either on an
63 // Instruction or a GlobalVariable (which walks its initializer).
64 static void findRefEdges(ModuleSummaryIndex &Index, const User *CurUser,
65 SetVector<ValueInfo> &RefEdges,
66 SmallPtrSet<const User *, 8> &Visited) {
67 SmallVector<const User *, 32> Worklist;
68 Worklist.push_back(CurUser);
70 while (!Worklist.empty()) {
71 const User *U = Worklist.pop_back_val();
73 if (!Visited.insert(U).second)
76 ImmutableCallSite CS(U);
78 for (const auto &OI : U->operands()) {
79 const User *Operand = dyn_cast<User>(OI);
82 if (isa<BlockAddress>(Operand))
84 if (auto *GV = dyn_cast<GlobalValue>(Operand)) {
85 // We have a reference to a global value. This should be added to
86 // the reference set unless it is a callee. Callees are handled
87 // specially by WriteFunction and are added to a separate list.
88 if (!(CS && CS.isCallee(&OI)))
89 RefEdges.insert(Index.getOrInsertValueInfo(GV));
92 Worklist.push_back(Operand);
97 static CalleeInfo::HotnessType getHotness(uint64_t ProfileCount,
98 ProfileSummaryInfo *PSI) {
100 return CalleeInfo::HotnessType::Unknown;
101 if (PSI->isHotCount(ProfileCount))
102 return CalleeInfo::HotnessType::Hot;
103 if (PSI->isColdCount(ProfileCount))
104 return CalleeInfo::HotnessType::Cold;
105 return CalleeInfo::HotnessType::None;
108 static bool isNonRenamableLocal(const GlobalValue &GV) {
109 return GV.hasSection() && GV.hasLocalLinkage();
112 /// Determine whether this call has all constant integer arguments (excluding
113 /// "this") and summarize it to VCalls or ConstVCalls as appropriate.
114 static void addVCallToSet(DevirtCallSite Call, GlobalValue::GUID Guid,
115 SetVector<FunctionSummary::VFuncId> &VCalls,
116 SetVector<FunctionSummary::ConstVCall> &ConstVCalls) {
117 std::vector<uint64_t> Args;
118 // Start from the second argument to skip the "this" pointer.
119 for (auto &Arg : make_range(Call.CS.arg_begin() + 1, Call.CS.arg_end())) {
120 auto *CI = dyn_cast<ConstantInt>(Arg);
121 if (!CI || CI->getBitWidth() > 64) {
122 VCalls.insert({Guid, Call.Offset});
125 Args.push_back(CI->getZExtValue());
127 ConstVCalls.insert({{Guid, Call.Offset}, std::move(Args)});
130 /// If this intrinsic call requires that we add information to the function
131 /// summary, do so via the non-constant reference arguments.
132 static void addIntrinsicToSummary(
133 const CallInst *CI, SetVector<GlobalValue::GUID> &TypeTests,
134 SetVector<FunctionSummary::VFuncId> &TypeTestAssumeVCalls,
135 SetVector<FunctionSummary::VFuncId> &TypeCheckedLoadVCalls,
136 SetVector<FunctionSummary::ConstVCall> &TypeTestAssumeConstVCalls,
137 SetVector<FunctionSummary::ConstVCall> &TypeCheckedLoadConstVCalls) {
138 switch (CI->getCalledFunction()->getIntrinsicID()) {
139 case Intrinsic::type_test: {
140 auto *TypeMDVal = cast<MetadataAsValue>(CI->getArgOperand(1));
141 auto *TypeId = dyn_cast<MDString>(TypeMDVal->getMetadata());
144 GlobalValue::GUID Guid = GlobalValue::getGUID(TypeId->getString());
146 // Produce a summary from type.test intrinsics. We only summarize type.test
147 // intrinsics that are used other than by an llvm.assume intrinsic.
148 // Intrinsics that are assumed are relevant only to the devirtualization
149 // pass, not the type test lowering pass.
150 bool HasNonAssumeUses = llvm::any_of(CI->uses(), [](const Use &CIU) {
151 auto *AssumeCI = dyn_cast<CallInst>(CIU.getUser());
154 Function *F = AssumeCI->getCalledFunction();
155 return !F || F->getIntrinsicID() != Intrinsic::assume;
157 if (HasNonAssumeUses)
158 TypeTests.insert(Guid);
160 SmallVector<DevirtCallSite, 4> DevirtCalls;
161 SmallVector<CallInst *, 4> Assumes;
162 findDevirtualizableCallsForTypeTest(DevirtCalls, Assumes, CI);
163 for (auto &Call : DevirtCalls)
164 addVCallToSet(Call, Guid, TypeTestAssumeVCalls,
165 TypeTestAssumeConstVCalls);
170 case Intrinsic::type_checked_load: {
171 auto *TypeMDVal = cast<MetadataAsValue>(CI->getArgOperand(2));
172 auto *TypeId = dyn_cast<MDString>(TypeMDVal->getMetadata());
175 GlobalValue::GUID Guid = GlobalValue::getGUID(TypeId->getString());
177 SmallVector<DevirtCallSite, 4> DevirtCalls;
178 SmallVector<Instruction *, 4> LoadedPtrs;
179 SmallVector<Instruction *, 4> Preds;
180 bool HasNonCallUses = false;
181 findDevirtualizableCallsForTypeCheckedLoad(DevirtCalls, LoadedPtrs, Preds,
183 // Any non-call uses of the result of llvm.type.checked.load will
184 // prevent us from optimizing away the llvm.type.test.
186 TypeTests.insert(Guid);
187 for (auto &Call : DevirtCalls)
188 addVCallToSet(Call, Guid, TypeCheckedLoadVCalls,
189 TypeCheckedLoadConstVCalls);
199 computeFunctionSummary(ModuleSummaryIndex &Index, const Module &M,
200 const Function &F, BlockFrequencyInfo *BFI,
201 ProfileSummaryInfo *PSI, bool HasLocalsInUsedOrAsm,
202 DenseSet<GlobalValue::GUID> &CantBePromoted) {
203 // Summary not currently supported for anonymous functions, they should
207 unsigned NumInsts = 0;
208 // Map from callee ValueId to profile count. Used to accumulate profile
209 // counts for all static calls to a given callee.
210 MapVector<ValueInfo, CalleeInfo> CallGraphEdges;
211 SetVector<ValueInfo> RefEdges;
212 SetVector<GlobalValue::GUID> TypeTests;
213 SetVector<FunctionSummary::VFuncId> TypeTestAssumeVCalls,
214 TypeCheckedLoadVCalls;
215 SetVector<FunctionSummary::ConstVCall> TypeTestAssumeConstVCalls,
216 TypeCheckedLoadConstVCalls;
217 ICallPromotionAnalysis ICallAnalysis;
218 SmallPtrSet<const User *, 8> Visited;
220 // Add personality function, prefix data and prologue data to function's ref
222 findRefEdges(Index, &F, RefEdges, Visited);
224 bool HasInlineAsmMaybeReferencingInternal = false;
225 for (const BasicBlock &BB : F)
226 for (const Instruction &I : BB) {
227 if (isa<DbgInfoIntrinsic>(I))
230 findRefEdges(Index, &I, RefEdges, Visited);
231 auto CS = ImmutableCallSite(&I);
235 const auto *CI = dyn_cast<CallInst>(&I);
236 // Since we don't know exactly which local values are referenced in inline
237 // assembly, conservatively mark the function as possibly referencing
238 // a local value from inline assembly to ensure we don't export a
239 // reference (which would require renaming and promotion of the
240 // referenced value).
241 if (HasLocalsInUsedOrAsm && CI && CI->isInlineAsm())
242 HasInlineAsmMaybeReferencingInternal = true;
244 auto *CalledValue = CS.getCalledValue();
245 auto *CalledFunction = CS.getCalledFunction();
246 if (CalledValue && !CalledFunction) {
247 CalledValue = CalledValue->stripPointerCastsNoFollowAliases();
248 // Stripping pointer casts can reveal a called function.
249 CalledFunction = dyn_cast<Function>(CalledValue);
251 // Check if this is an alias to a function. If so, get the
252 // called aliasee for the checks below.
253 if (auto *GA = dyn_cast<GlobalAlias>(CalledValue)) {
254 assert(!CalledFunction && "Expected null called function in callsite for alias");
255 CalledFunction = dyn_cast<Function>(GA->getBaseObject());
257 // Check if this is a direct call to a known function or a known
258 // intrinsic, or an indirect call with profile data.
259 if (CalledFunction) {
260 if (CI && CalledFunction->isIntrinsic()) {
261 addIntrinsicToSummary(
262 CI, TypeTests, TypeTestAssumeVCalls, TypeCheckedLoadVCalls,
263 TypeTestAssumeConstVCalls, TypeCheckedLoadConstVCalls);
266 // We should have named any anonymous globals
267 assert(CalledFunction->hasName());
268 auto ScaledCount = PSI->getProfileCount(&I, BFI);
269 auto Hotness = ScaledCount ? getHotness(ScaledCount.getValue(), PSI)
270 : CalleeInfo::HotnessType::Unknown;
272 // Use the original CalledValue, in case it was an alias. We want
273 // to record the call edge to the alias in that case. Eventually
274 // an alias summary will be created to associate the alias and
276 CallGraphEdges[Index.getOrInsertValueInfo(
277 cast<GlobalValue>(CalledValue))]
278 .updateHotness(Hotness);
280 // Skip inline assembly calls.
281 if (CI && CI->isInlineAsm())
283 // Skip direct calls.
284 if (!CalledValue || isa<Constant>(CalledValue))
287 uint32_t NumVals, NumCandidates;
289 auto CandidateProfileData =
290 ICallAnalysis.getPromotionCandidatesForInstruction(
291 &I, NumVals, TotalCount, NumCandidates);
292 for (auto &Candidate : CandidateProfileData)
293 CallGraphEdges[Index.getOrInsertValueInfo(Candidate.Value)]
294 .updateHotness(getHotness(Candidate.Count, PSI));
298 // Explicit add hot edges to enforce importing for designated GUIDs for
299 // sample PGO, to enable the same inlines as the profiled optimized binary.
300 for (auto &I : F.getImportGUIDs())
301 CallGraphEdges[Index.getOrInsertValueInfo(I)].updateHotness(
302 CalleeInfo::HotnessType::Critical);
304 bool NonRenamableLocal = isNonRenamableLocal(F);
305 bool NotEligibleForImport =
306 NonRenamableLocal || HasInlineAsmMaybeReferencingInternal ||
307 // Inliner doesn't handle variadic functions.
308 // FIXME: refactor this to use the same code that inliner is using.
310 GlobalValueSummary::GVFlags Flags(F.getLinkage(), NotEligibleForImport,
311 /* Live = */ false, F.isDSOLocal());
312 FunctionSummary::FFlags FunFlags{
313 F.hasFnAttribute(Attribute::ReadNone),
314 F.hasFnAttribute(Attribute::ReadOnly),
315 F.hasFnAttribute(Attribute::NoRecurse),
316 F.returnDoesNotAlias(),
318 auto FuncSummary = llvm::make_unique<FunctionSummary>(
319 Flags, NumInsts, FunFlags, RefEdges.takeVector(),
320 CallGraphEdges.takeVector(), TypeTests.takeVector(),
321 TypeTestAssumeVCalls.takeVector(), TypeCheckedLoadVCalls.takeVector(),
322 TypeTestAssumeConstVCalls.takeVector(),
323 TypeCheckedLoadConstVCalls.takeVector());
324 if (NonRenamableLocal)
325 CantBePromoted.insert(F.getGUID());
326 Index.addGlobalValueSummary(F.getName(), std::move(FuncSummary));
330 computeVariableSummary(ModuleSummaryIndex &Index, const GlobalVariable &V,
331 DenseSet<GlobalValue::GUID> &CantBePromoted) {
332 SetVector<ValueInfo> RefEdges;
333 SmallPtrSet<const User *, 8> Visited;
334 findRefEdges(Index, &V, RefEdges, Visited);
335 bool NonRenamableLocal = isNonRenamableLocal(V);
336 GlobalValueSummary::GVFlags Flags(V.getLinkage(), NonRenamableLocal,
337 /* Live = */ false, V.isDSOLocal());
339 llvm::make_unique<GlobalVarSummary>(Flags, RefEdges.takeVector());
340 if (NonRenamableLocal)
341 CantBePromoted.insert(V.getGUID());
342 Index.addGlobalValueSummary(V.getName(), std::move(GVarSummary));
346 computeAliasSummary(ModuleSummaryIndex &Index, const GlobalAlias &A,
347 DenseSet<GlobalValue::GUID> &CantBePromoted) {
348 bool NonRenamableLocal = isNonRenamableLocal(A);
349 GlobalValueSummary::GVFlags Flags(A.getLinkage(), NonRenamableLocal,
350 /* Live = */ false, A.isDSOLocal());
351 auto AS = llvm::make_unique<AliasSummary>(Flags);
352 auto *Aliasee = A.getBaseObject();
353 auto *AliaseeSummary = Index.getGlobalValueSummary(*Aliasee);
354 assert(AliaseeSummary && "Alias expects aliasee summary to be parsed");
355 AS->setAliasee(AliaseeSummary);
356 if (NonRenamableLocal)
357 CantBePromoted.insert(A.getGUID());
358 Index.addGlobalValueSummary(A.getName(), std::move(AS));
361 // Set LiveRoot flag on entries matching the given value name.
362 static void setLiveRoot(ModuleSummaryIndex &Index, StringRef Name) {
363 if (ValueInfo VI = Index.getValueInfo(GlobalValue::getGUID(Name)))
364 for (auto &Summary : VI.getSummaryList())
365 Summary->setLive(true);
368 ModuleSummaryIndex llvm::buildModuleSummaryIndex(
370 std::function<BlockFrequencyInfo *(const Function &F)> GetBFICallback,
371 ProfileSummaryInfo *PSI) {
373 ModuleSummaryIndex Index;
375 // Identify the local values in the llvm.used and llvm.compiler.used sets,
376 // which should not be exported as they would then require renaming and
377 // promotion, but we may have opaque uses e.g. in inline asm. We collect them
378 // here because we use this information to mark functions containing inline
379 // assembly calls as not importable.
380 SmallPtrSet<GlobalValue *, 8> LocalsUsed;
381 SmallPtrSet<GlobalValue *, 8> Used;
382 // First collect those in the llvm.used set.
383 collectUsedGlobalVariables(M, Used, /*CompilerUsed*/ false);
384 // Next collect those in the llvm.compiler.used set.
385 collectUsedGlobalVariables(M, Used, /*CompilerUsed*/ true);
386 DenseSet<GlobalValue::GUID> CantBePromoted;
387 for (auto *V : Used) {
388 if (V->hasLocalLinkage()) {
389 LocalsUsed.insert(V);
390 CantBePromoted.insert(V->getGUID());
394 bool HasLocalInlineAsmSymbol = false;
395 if (!M.getModuleInlineAsm().empty()) {
396 // Collect the local values defined by module level asm, and set up
397 // summaries for these symbols so that they can be marked as NoRename,
398 // to prevent export of any use of them in regular IR that would require
399 // renaming within the module level asm. Note we don't need to create a
400 // summary for weak or global defs, as they don't need to be flagged as
401 // NoRename, and defs in module level asm can't be imported anyway.
402 // Also, any values used but not defined within module level asm should
403 // be listed on the llvm.used or llvm.compiler.used global and marked as
404 // referenced from there.
405 ModuleSymbolTable::CollectAsmSymbols(
406 M, [&](StringRef Name, object::BasicSymbolRef::Flags Flags) {
407 // Symbols not marked as Weak or Global are local definitions.
408 if (Flags & (object::BasicSymbolRef::SF_Weak |
409 object::BasicSymbolRef::SF_Global))
411 HasLocalInlineAsmSymbol = true;
412 GlobalValue *GV = M.getNamedValue(Name);
415 assert(GV->isDeclaration() && "Def in module asm already has definition");
416 GlobalValueSummary::GVFlags GVFlags(GlobalValue::InternalLinkage,
417 /* NotEligibleToImport = */ true,
419 /* Local */ GV->isDSOLocal());
420 CantBePromoted.insert(GlobalValue::getGUID(Name));
421 // Create the appropriate summary type.
422 if (Function *F = dyn_cast<Function>(GV)) {
423 std::unique_ptr<FunctionSummary> Summary =
424 llvm::make_unique<FunctionSummary>(
426 FunctionSummary::FFlags{
427 F->hasFnAttribute(Attribute::ReadNone),
428 F->hasFnAttribute(Attribute::ReadOnly),
429 F->hasFnAttribute(Attribute::NoRecurse),
430 F->returnDoesNotAlias()},
431 ArrayRef<ValueInfo>{}, ArrayRef<FunctionSummary::EdgeTy>{},
432 ArrayRef<GlobalValue::GUID>{},
433 ArrayRef<FunctionSummary::VFuncId>{},
434 ArrayRef<FunctionSummary::VFuncId>{},
435 ArrayRef<FunctionSummary::ConstVCall>{},
436 ArrayRef<FunctionSummary::ConstVCall>{});
437 Index.addGlobalValueSummary(Name, std::move(Summary));
439 std::unique_ptr<GlobalVarSummary> Summary =
440 llvm::make_unique<GlobalVarSummary>(GVFlags,
441 ArrayRef<ValueInfo>{});
442 Index.addGlobalValueSummary(Name, std::move(Summary));
447 // Compute summaries for all functions defined in module, and save in the
450 if (F.isDeclaration())
453 BlockFrequencyInfo *BFI = nullptr;
454 std::unique_ptr<BlockFrequencyInfo> BFIPtr;
456 BFI = GetBFICallback(F);
457 else if (F.hasProfileData()) {
458 LoopInfo LI{DominatorTree(const_cast<Function &>(F))};
459 BranchProbabilityInfo BPI{F, LI};
460 BFIPtr = llvm::make_unique<BlockFrequencyInfo>(F, BPI, LI);
464 computeFunctionSummary(Index, M, F, BFI, PSI,
465 !LocalsUsed.empty() || HasLocalInlineAsmSymbol,
469 // Compute summaries for all variables defined in module, and save in the
471 for (const GlobalVariable &G : M.globals()) {
472 if (G.isDeclaration())
474 computeVariableSummary(Index, G, CantBePromoted);
477 // Compute summaries for all aliases defined in module, and save in the
479 for (const GlobalAlias &A : M.aliases())
480 computeAliasSummary(Index, A, CantBePromoted);
482 for (auto *V : LocalsUsed) {
483 auto *Summary = Index.getGlobalValueSummary(*V);
484 assert(Summary && "Missing summary for global value");
485 Summary->setNotEligibleToImport();
488 // The linker doesn't know about these LLVM produced values, so we need
489 // to flag them as live in the index to ensure index-based dead value
490 // analysis treats them as live roots of the analysis.
491 setLiveRoot(Index, "llvm.used");
492 setLiveRoot(Index, "llvm.compiler.used");
493 setLiveRoot(Index, "llvm.global_ctors");
494 setLiveRoot(Index, "llvm.global_dtors");
495 setLiveRoot(Index, "llvm.global.annotations");
497 bool IsThinLTO = true;
499 mdconst::extract_or_null<ConstantInt>(M.getModuleFlag("ThinLTO")))
500 IsThinLTO = MD->getZExtValue();
502 for (auto &GlobalList : Index) {
503 // Ignore entries for references that are undefined in the current module.
504 if (GlobalList.second.SummaryList.empty())
507 assert(GlobalList.second.SummaryList.size() == 1 &&
508 "Expected module's index to have one summary per GUID");
509 auto &Summary = GlobalList.second.SummaryList[0];
511 Summary->setNotEligibleToImport();
515 bool AllRefsCanBeExternallyReferenced =
516 llvm::all_of(Summary->refs(), [&](const ValueInfo &VI) {
517 return !CantBePromoted.count(VI.getGUID());
519 if (!AllRefsCanBeExternallyReferenced) {
520 Summary->setNotEligibleToImport();
524 if (auto *FuncSummary = dyn_cast<FunctionSummary>(Summary.get())) {
525 bool AllCallsCanBeExternallyReferenced = llvm::all_of(
526 FuncSummary->calls(), [&](const FunctionSummary::EdgeTy &Edge) {
527 return !CantBePromoted.count(Edge.first.getGUID());
529 if (!AllCallsCanBeExternallyReferenced)
530 Summary->setNotEligibleToImport();
537 AnalysisKey ModuleSummaryIndexAnalysis::Key;
540 ModuleSummaryIndexAnalysis::run(Module &M, ModuleAnalysisManager &AM) {
541 ProfileSummaryInfo &PSI = AM.getResult<ProfileSummaryAnalysis>(M);
542 auto &FAM = AM.getResult<FunctionAnalysisManagerModuleProxy>(M).getManager();
543 return buildModuleSummaryIndex(
545 [&FAM](const Function &F) {
546 return &FAM.getResult<BlockFrequencyAnalysis>(
547 *const_cast<Function *>(&F));
552 char ModuleSummaryIndexWrapperPass::ID = 0;
554 INITIALIZE_PASS_BEGIN(ModuleSummaryIndexWrapperPass, "module-summary-analysis",
555 "Module Summary Analysis", false, true)
556 INITIALIZE_PASS_DEPENDENCY(BlockFrequencyInfoWrapperPass)
557 INITIALIZE_PASS_DEPENDENCY(ProfileSummaryInfoWrapperPass)
558 INITIALIZE_PASS_END(ModuleSummaryIndexWrapperPass, "module-summary-analysis",
559 "Module Summary Analysis", false, true)
561 ModulePass *llvm::createModuleSummaryIndexWrapperPass() {
562 return new ModuleSummaryIndexWrapperPass();
565 ModuleSummaryIndexWrapperPass::ModuleSummaryIndexWrapperPass()
567 initializeModuleSummaryIndexWrapperPassPass(*PassRegistry::getPassRegistry());
570 bool ModuleSummaryIndexWrapperPass::runOnModule(Module &M) {
571 auto &PSI = *getAnalysis<ProfileSummaryInfoWrapperPass>().getPSI();
572 Index = buildModuleSummaryIndex(
574 [this](const Function &F) {
575 return &(this->getAnalysis<BlockFrequencyInfoWrapperPass>(
576 *const_cast<Function *>(&F))
583 bool ModuleSummaryIndexWrapperPass::doFinalization(Module &M) {
588 void ModuleSummaryIndexWrapperPass::getAnalysisUsage(AnalysisUsage &AU) const {
589 AU.setPreservesAll();
590 AU.addRequired<BlockFrequencyInfoWrapperPass>();
591 AU.addRequired<ProfileSummaryInfoWrapperPass>();