LLVM 19.0.0git
ThinLTOBitcodeWriter.cpp
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1//===- ThinLTOBitcodeWriter.cpp - Bitcode writing pass for ThinLTO --------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
15#include "llvm/IR/Constants.h"
16#include "llvm/IR/DebugInfo.h"
18#include "llvm/IR/Intrinsics.h"
19#include "llvm/IR/Module.h"
20#include "llvm/IR/PassManager.h"
23#include "llvm/Transforms/IPO.h"
29using namespace llvm;
30
31namespace {
32
33// Determine if a promotion alias should be created for a symbol name.
34static bool allowPromotionAlias(const std::string &Name) {
35 // Promotion aliases are used only in inline assembly. It's safe to
36 // simply skip unusual names. Subset of MCAsmInfo::isAcceptableChar()
37 // and MCAsmInfoXCOFF::isAcceptableChar().
38 for (const char &C : Name) {
39 if (isAlnum(C) || C == '_' || C == '.')
40 continue;
41 return false;
42 }
43 return true;
44}
45
46// Promote each local-linkage entity defined by ExportM and used by ImportM by
47// changing visibility and appending the given ModuleId.
48void promoteInternals(Module &ExportM, Module &ImportM, StringRef ModuleId,
49 SetVector<GlobalValue *> &PromoteExtra) {
51 for (auto &ExportGV : ExportM.global_values()) {
52 if (!ExportGV.hasLocalLinkage())
53 continue;
54
55 auto Name = ExportGV.getName();
56 GlobalValue *ImportGV = nullptr;
57 if (!PromoteExtra.count(&ExportGV)) {
58 ImportGV = ImportM.getNamedValue(Name);
59 if (!ImportGV)
60 continue;
61 ImportGV->removeDeadConstantUsers();
62 if (ImportGV->use_empty()) {
63 ImportGV->eraseFromParent();
64 continue;
65 }
66 }
67
68 std::string OldName = Name.str();
69 std::string NewName = (Name + ModuleId).str();
70
71 if (const auto *C = ExportGV.getComdat())
72 if (C->getName() == Name)
73 RenamedComdats.try_emplace(C, ExportM.getOrInsertComdat(NewName));
74
75 ExportGV.setName(NewName);
76 ExportGV.setLinkage(GlobalValue::ExternalLinkage);
77 ExportGV.setVisibility(GlobalValue::HiddenVisibility);
78
79 if (ImportGV) {
80 ImportGV->setName(NewName);
82 }
83
84 if (isa<Function>(&ExportGV) && allowPromotionAlias(OldName)) {
85 // Create a local alias with the original name to avoid breaking
86 // references from inline assembly.
87 std::string Alias =
88 ".lto_set_conditional " + OldName + "," + NewName + "\n";
89 ExportM.appendModuleInlineAsm(Alias);
90 }
91 }
92
93 if (!RenamedComdats.empty())
94 for (auto &GO : ExportM.global_objects())
95 if (auto *C = GO.getComdat()) {
96 auto Replacement = RenamedComdats.find(C);
97 if (Replacement != RenamedComdats.end())
98 GO.setComdat(Replacement->second);
99 }
100}
101
102// Promote all internal (i.e. distinct) type ids used by the module by replacing
103// them with external type ids formed using the module id.
104//
105// Note that this needs to be done before we clone the module because each clone
106// will receive its own set of distinct metadata nodes.
107void promoteTypeIds(Module &M, StringRef ModuleId) {
109 auto ExternalizeTypeId = [&](CallInst *CI, unsigned ArgNo) {
110 Metadata *MD =
111 cast<MetadataAsValue>(CI->getArgOperand(ArgNo))->getMetadata();
112
113 if (isa<MDNode>(MD) && cast<MDNode>(MD)->isDistinct()) {
114 Metadata *&GlobalMD = LocalToGlobal[MD];
115 if (!GlobalMD) {
116 std::string NewName = (Twine(LocalToGlobal.size()) + ModuleId).str();
117 GlobalMD = MDString::get(M.getContext(), NewName);
118 }
119
120 CI->setArgOperand(ArgNo,
121 MetadataAsValue::get(M.getContext(), GlobalMD));
122 }
123 };
124
125 if (Function *TypeTestFunc =
126 M.getFunction(Intrinsic::getName(Intrinsic::type_test))) {
127 for (const Use &U : TypeTestFunc->uses()) {
128 auto CI = cast<CallInst>(U.getUser());
129 ExternalizeTypeId(CI, 1);
130 }
131 }
132
133 if (Function *PublicTypeTestFunc =
134 M.getFunction(Intrinsic::getName(Intrinsic::public_type_test))) {
135 for (const Use &U : PublicTypeTestFunc->uses()) {
136 auto CI = cast<CallInst>(U.getUser());
137 ExternalizeTypeId(CI, 1);
138 }
139 }
140
141 if (Function *TypeCheckedLoadFunc =
142 M.getFunction(Intrinsic::getName(Intrinsic::type_checked_load))) {
143 for (const Use &U : TypeCheckedLoadFunc->uses()) {
144 auto CI = cast<CallInst>(U.getUser());
145 ExternalizeTypeId(CI, 2);
146 }
147 }
148
149 if (Function *TypeCheckedLoadRelativeFunc = M.getFunction(
150 Intrinsic::getName(Intrinsic::type_checked_load_relative))) {
151 for (const Use &U : TypeCheckedLoadRelativeFunc->uses()) {
152 auto CI = cast<CallInst>(U.getUser());
153 ExternalizeTypeId(CI, 2);
154 }
155 }
156
157 for (GlobalObject &GO : M.global_objects()) {
159 GO.getMetadata(LLVMContext::MD_type, MDs);
160
161 GO.eraseMetadata(LLVMContext::MD_type);
162 for (auto *MD : MDs) {
163 auto I = LocalToGlobal.find(MD->getOperand(1));
164 if (I == LocalToGlobal.end()) {
165 GO.addMetadata(LLVMContext::MD_type, *MD);
166 continue;
167 }
168 GO.addMetadata(
169 LLVMContext::MD_type,
170 *MDNode::get(M.getContext(), {MD->getOperand(0), I->second}));
171 }
172 }
173}
174
175// Drop unused globals, and drop type information from function declarations.
176// FIXME: If we made functions typeless then there would be no need to do this.
177void simplifyExternals(Module &M) {
178 FunctionType *EmptyFT =
179 FunctionType::get(Type::getVoidTy(M.getContext()), false);
180
182 if (F.isDeclaration() && F.use_empty()) {
183 F.eraseFromParent();
184 continue;
185 }
186
187 if (!F.isDeclaration() || F.getFunctionType() == EmptyFT ||
188 // Changing the type of an intrinsic may invalidate the IR.
189 F.getName().starts_with("llvm."))
190 continue;
191
192 Function *NewF =
194 F.getAddressSpace(), "", &M);
195 NewF->copyAttributesFrom(&F);
196 // Only copy function attribtues.
197 NewF->setAttributes(AttributeList::get(M.getContext(),
199 F.getAttributes().getFnAttrs()));
200 NewF->takeName(&F);
201 F.replaceAllUsesWith(NewF);
202 F.eraseFromParent();
203 }
204
205 for (GlobalIFunc &I : llvm::make_early_inc_range(M.ifuncs())) {
206 if (I.use_empty())
207 I.eraseFromParent();
208 else
209 assert(I.getResolverFunction() && "ifunc misses its resolver function");
210 }
211
212 for (GlobalVariable &GV : llvm::make_early_inc_range(M.globals())) {
213 if (GV.isDeclaration() && GV.use_empty()) {
214 GV.eraseFromParent();
215 continue;
216 }
217 }
218}
219
220static void
221filterModule(Module *M,
222 function_ref<bool(const GlobalValue *)> ShouldKeepDefinition) {
223 std::vector<GlobalValue *> V;
224 for (GlobalValue &GV : M->global_values())
225 if (!ShouldKeepDefinition(&GV))
226 V.push_back(&GV);
227
228 for (GlobalValue *GV : V)
229 if (!convertToDeclaration(*GV))
230 GV->eraseFromParent();
231}
232
233void forEachVirtualFunction(Constant *C, function_ref<void(Function *)> Fn) {
234 if (auto *F = dyn_cast<Function>(C))
235 return Fn(F);
236 if (isa<GlobalValue>(C))
237 return;
238 for (Value *Op : C->operands())
239 forEachVirtualFunction(cast<Constant>(Op), Fn);
240}
241
242// Clone any @llvm[.compiler].used over to the new module and append
243// values whose defs were cloned into that module.
244static void cloneUsedGlobalVariables(const Module &SrcM, Module &DestM,
245 bool CompilerUsed) {
247 // First collect those in the llvm[.compiler].used set.
248 collectUsedGlobalVariables(SrcM, Used, CompilerUsed);
249 // Next build a set of the equivalent values defined in DestM.
250 for (auto *V : Used) {
251 auto *GV = DestM.getNamedValue(V->getName());
252 if (GV && !GV->isDeclaration())
253 NewUsed.push_back(GV);
254 }
255 // Finally, add them to a llvm[.compiler].used variable in DestM.
256 if (CompilerUsed)
257 appendToCompilerUsed(DestM, NewUsed);
258 else
259 appendToUsed(DestM, NewUsed);
260}
261
262#ifndef NDEBUG
263static bool enableUnifiedLTO(Module &M) {
264 bool UnifiedLTO = false;
265 if (auto *MD =
266 mdconst::extract_or_null<ConstantInt>(M.getModuleFlag("UnifiedLTO")))
267 UnifiedLTO = MD->getZExtValue();
268 return UnifiedLTO;
269}
270#endif
271
272// If it's possible to split M into regular and thin LTO parts, do so and write
273// a multi-module bitcode file with the two parts to OS. Otherwise, write only a
274// regular LTO bitcode file to OS.
275void splitAndWriteThinLTOBitcode(
276 raw_ostream &OS, raw_ostream *ThinLinkOS,
277 function_ref<AAResults &(Function &)> AARGetter, Module &M) {
278 std::string ModuleId = getUniqueModuleId(&M);
279 if (ModuleId.empty()) {
280 assert(!enableUnifiedLTO(M));
281 // We couldn't generate a module ID for this module, write it out as a
282 // regular LTO module with an index for summary-based dead stripping.
283 ProfileSummaryInfo PSI(M);
284 M.addModuleFlag(Module::Error, "ThinLTO", uint32_t(0));
286 WriteBitcodeToFile(M, OS, /*ShouldPreserveUseListOrder=*/false, &Index,
287 /*UnifiedLTO=*/false);
288
289 if (ThinLinkOS)
290 // We don't have a ThinLTO part, but still write the module to the
291 // ThinLinkOS if requested so that the expected output file is produced.
292 WriteBitcodeToFile(M, *ThinLinkOS, /*ShouldPreserveUseListOrder=*/false,
293 &Index, /*UnifiedLTO=*/false);
294
295 return;
296 }
297
298 promoteTypeIds(M, ModuleId);
299
300 // Returns whether a global or its associated global has attached type
301 // metadata. The former may participate in CFI or whole-program
302 // devirtualization, so they need to appear in the merged module instead of
303 // the thin LTO module. Similarly, globals that are associated with globals
304 // with type metadata need to appear in the merged module because they will
305 // reference the global's section directly.
306 auto HasTypeMetadata = [](const GlobalObject *GO) {
307 if (MDNode *MD = GO->getMetadata(LLVMContext::MD_associated))
308 if (auto *AssocVM = dyn_cast_or_null<ValueAsMetadata>(MD->getOperand(0)))
309 if (auto *AssocGO = dyn_cast<GlobalObject>(AssocVM->getValue()))
310 if (AssocGO->hasMetadata(LLVMContext::MD_type))
311 return true;
312 return GO->hasMetadata(LLVMContext::MD_type);
313 };
314
315 // Collect the set of virtual functions that are eligible for virtual constant
316 // propagation. Each eligible function must not access memory, must return
317 // an integer of width <=64 bits, must take at least one argument, must not
318 // use its first argument (assumed to be "this") and all arguments other than
319 // the first one must be of <=64 bit integer type.
320 //
321 // Note that we test whether this copy of the function is readnone, rather
322 // than testing function attributes, which must hold for any copy of the
323 // function, even a less optimized version substituted at link time. This is
324 // sound because the virtual constant propagation optimizations effectively
325 // inline all implementations of the virtual function into each call site,
326 // rather than using function attributes to perform local optimization.
327 DenseSet<const Function *> EligibleVirtualFns;
328 // If any member of a comdat lives in MergedM, put all members of that
329 // comdat in MergedM to keep the comdat together.
330 DenseSet<const Comdat *> MergedMComdats;
331 for (GlobalVariable &GV : M.globals())
332 if (!GV.isDeclaration() && HasTypeMetadata(&GV)) {
333 if (const auto *C = GV.getComdat())
334 MergedMComdats.insert(C);
335 forEachVirtualFunction(GV.getInitializer(), [&](Function *F) {
336 auto *RT = dyn_cast<IntegerType>(F->getReturnType());
337 if (!RT || RT->getBitWidth() > 64 || F->arg_empty() ||
338 !F->arg_begin()->use_empty())
339 return;
340 for (auto &Arg : drop_begin(F->args())) {
341 auto *ArgT = dyn_cast<IntegerType>(Arg.getType());
342 if (!ArgT || ArgT->getBitWidth() > 64)
343 return;
344 }
345 if (!F->isDeclaration() &&
346 computeFunctionBodyMemoryAccess(*F, AARGetter(*F))
347 .doesNotAccessMemory())
348 EligibleVirtualFns.insert(F);
349 });
350 }
351
353 std::unique_ptr<Module> MergedM(
354 CloneModule(M, VMap, [&](const GlobalValue *GV) -> bool {
355 if (const auto *C = GV->getComdat())
356 if (MergedMComdats.count(C))
357 return true;
358 if (auto *F = dyn_cast<Function>(GV))
359 return EligibleVirtualFns.count(F);
360 if (auto *GVar =
361 dyn_cast_or_null<GlobalVariable>(GV->getAliaseeObject()))
362 return HasTypeMetadata(GVar);
363 return false;
364 }));
365 StripDebugInfo(*MergedM);
366 MergedM->setModuleInlineAsm("");
367
368 // Clone any llvm.*used globals to ensure the included values are
369 // not deleted.
370 cloneUsedGlobalVariables(M, *MergedM, /*CompilerUsed*/ false);
371 cloneUsedGlobalVariables(M, *MergedM, /*CompilerUsed*/ true);
372
373 for (Function &F : *MergedM)
374 if (!F.isDeclaration()) {
375 // Reset the linkage of all functions eligible for virtual constant
376 // propagation. The canonical definitions live in the thin LTO module so
377 // that they can be imported.
379 F.setComdat(nullptr);
380 }
381
382 SetVector<GlobalValue *> CfiFunctions;
383 for (auto &F : M)
384 if ((!F.hasLocalLinkage() || F.hasAddressTaken()) && HasTypeMetadata(&F))
385 CfiFunctions.insert(&F);
386
387 // Remove all globals with type metadata, globals with comdats that live in
388 // MergedM, and aliases pointing to such globals from the thin LTO module.
389 filterModule(&M, [&](const GlobalValue *GV) {
390 if (auto *GVar = dyn_cast_or_null<GlobalVariable>(GV->getAliaseeObject()))
391 if (HasTypeMetadata(GVar))
392 return false;
393 if (const auto *C = GV->getComdat())
394 if (MergedMComdats.count(C))
395 return false;
396 return true;
397 });
398
399 promoteInternals(*MergedM, M, ModuleId, CfiFunctions);
400 promoteInternals(M, *MergedM, ModuleId, CfiFunctions);
401
402 auto &Ctx = MergedM->getContext();
403 SmallVector<MDNode *, 8> CfiFunctionMDs;
404 for (auto *V : CfiFunctions) {
405 Function &F = *cast<Function>(V);
407 F.getMetadata(LLVMContext::MD_type, Types);
408
410 Elts.push_back(MDString::get(Ctx, F.getName()));
414 else if (F.hasExternalWeakLinkage())
416 else
419 llvm::ConstantInt::get(Type::getInt8Ty(Ctx), Linkage)));
420 append_range(Elts, Types);
421 CfiFunctionMDs.push_back(MDTuple::get(Ctx, Elts));
422 }
423
424 if(!CfiFunctionMDs.empty()) {
425 NamedMDNode *NMD = MergedM->getOrInsertNamedMetadata("cfi.functions");
426 for (auto *MD : CfiFunctionMDs)
427 NMD->addOperand(MD);
428 }
429
430 SmallVector<MDNode *, 8> FunctionAliases;
431 for (auto &A : M.aliases()) {
432 if (!isa<Function>(A.getAliasee()))
433 continue;
434
435 auto *F = cast<Function>(A.getAliasee());
436
437 Metadata *Elts[] = {
438 MDString::get(Ctx, A.getName()),
439 MDString::get(Ctx, F->getName()),
441 ConstantInt::get(Type::getInt8Ty(Ctx), A.getVisibility())),
443 ConstantInt::get(Type::getInt8Ty(Ctx), A.isWeakForLinker())),
444 };
445
446 FunctionAliases.push_back(MDTuple::get(Ctx, Elts));
447 }
448
449 if (!FunctionAliases.empty()) {
450 NamedMDNode *NMD = MergedM->getOrInsertNamedMetadata("aliases");
451 for (auto *MD : FunctionAliases)
452 NMD->addOperand(MD);
453 }
454
457 Function *F = M.getFunction(Name);
458 if (!F || F->use_empty())
459 return;
460
461 Symvers.push_back(MDTuple::get(
462 Ctx, {MDString::get(Ctx, Name), MDString::get(Ctx, Alias)}));
463 });
464
465 if (!Symvers.empty()) {
466 NamedMDNode *NMD = MergedM->getOrInsertNamedMetadata("symvers");
467 for (auto *MD : Symvers)
468 NMD->addOperand(MD);
469 }
470
471 simplifyExternals(*MergedM);
472
473 // FIXME: Try to re-use BSI and PFI from the original module here.
474 ProfileSummaryInfo PSI(M);
476
477 // Mark the merged module as requiring full LTO. We still want an index for
478 // it though, so that it can participate in summary-based dead stripping.
479 MergedM->addModuleFlag(Module::Error, "ThinLTO", uint32_t(0));
480 ModuleSummaryIndex MergedMIndex =
481 buildModuleSummaryIndex(*MergedM, nullptr, &PSI);
482
484
485 BitcodeWriter W(Buffer);
486 // Save the module hash produced for the full bitcode, which will
487 // be used in the backends, and use that in the minimized bitcode
488 // produced for the full link.
489 ModuleHash ModHash = {{0}};
490 W.writeModule(M, /*ShouldPreserveUseListOrder=*/false, &Index,
491 /*GenerateHash=*/true, &ModHash);
492 W.writeModule(*MergedM, /*ShouldPreserveUseListOrder=*/false, &MergedMIndex);
493 W.writeSymtab();
494 W.writeStrtab();
495 OS << Buffer;
496
497 // If a minimized bitcode module was requested for the thin link, only
498 // the information that is needed by thin link will be written in the
499 // given OS (the merged module will be written as usual).
500 if (ThinLinkOS) {
501 Buffer.clear();
502 BitcodeWriter W2(Buffer);
504 W2.writeThinLinkBitcode(M, Index, ModHash);
505 W2.writeModule(*MergedM, /*ShouldPreserveUseListOrder=*/false,
506 &MergedMIndex);
507 W2.writeSymtab();
508 W2.writeStrtab();
509 *ThinLinkOS << Buffer;
510 }
511}
512
513// Check if the LTO Unit splitting has been enabled.
514bool enableSplitLTOUnit(Module &M) {
515 bool EnableSplitLTOUnit = false;
516 if (auto *MD = mdconst::extract_or_null<ConstantInt>(
517 M.getModuleFlag("EnableSplitLTOUnit")))
518 EnableSplitLTOUnit = MD->getZExtValue();
519 return EnableSplitLTOUnit;
520}
521
522// Returns whether this module needs to be split because it uses type metadata.
523bool hasTypeMetadata(Module &M) {
524 for (auto &GO : M.global_objects()) {
525 if (GO.hasMetadata(LLVMContext::MD_type))
526 return true;
527 }
528 return false;
529}
530
531bool writeThinLTOBitcode(raw_ostream &OS, raw_ostream *ThinLinkOS,
532 function_ref<AAResults &(Function &)> AARGetter,
533 Module &M, const ModuleSummaryIndex *Index) {
534 std::unique_ptr<ModuleSummaryIndex> NewIndex = nullptr;
535 // See if this module has any type metadata. If so, we try to split it
536 // or at least promote type ids to enable WPD.
537 if (hasTypeMetadata(M)) {
538 if (enableSplitLTOUnit(M)) {
539 splitAndWriteThinLTOBitcode(OS, ThinLinkOS, AARGetter, M);
540 return true;
541 }
542 // Promote type ids as needed for index-based WPD.
543 std::string ModuleId = getUniqueModuleId(&M);
544 if (!ModuleId.empty()) {
545 promoteTypeIds(M, ModuleId);
546 // Need to rebuild the index so that it contains type metadata
547 // for the newly promoted type ids.
548 // FIXME: Probably should not bother building the index at all
549 // in the caller of writeThinLTOBitcode (which does so via the
550 // ModuleSummaryIndexAnalysis pass), since we have to rebuild it
551 // anyway whenever there is type metadata (here or in
552 // splitAndWriteThinLTOBitcode). Just always build it once via the
553 // buildModuleSummaryIndex when Module(s) are ready.
554 ProfileSummaryInfo PSI(M);
555 NewIndex = std::make_unique<ModuleSummaryIndex>(
556 buildModuleSummaryIndex(M, nullptr, &PSI));
557 Index = NewIndex.get();
558 }
559 }
560
561 // Write it out as an unsplit ThinLTO module.
562
563 // Save the module hash produced for the full bitcode, which will
564 // be used in the backends, and use that in the minimized bitcode
565 // produced for the full link.
566 ModuleHash ModHash = {{0}};
567 WriteBitcodeToFile(M, OS, /*ShouldPreserveUseListOrder=*/false, Index,
568 /*GenerateHash=*/true, &ModHash);
569 // If a minimized bitcode module was requested for the thin link, only
570 // the information that is needed by thin link will be written in the
571 // given OS.
572 if (ThinLinkOS && Index)
573 writeThinLinkBitcodeToFile(M, *ThinLinkOS, *Index, ModHash);
574 return false;
575}
576
577} // anonymous namespace
583
584 // RemoveDIs: there's no bitcode representation of the DbgVariableRecord
585 // debug-info, convert to dbg.values before writing out.
586 ScopedDbgInfoFormatSetter FormatSetter(M, M.IsNewDbgInfoFormat &&
588
589 bool Changed = writeThinLTOBitcode(
590 OS, ThinLinkOS,
591 [&FAM](Function &F) -> AAResults & {
592 return FAM.getResult<AAManager>(F);
593 },
595
596 return Changed ? PreservedAnalyses::none() : PreservedAnalyses::all();
597}
This is the interface for LLVM's primary stateless and local alias analysis.
static GCRegistry::Add< ErlangGC > A("erlang", "erlang-compatible garbage collector")
This file contains the declarations for the subclasses of Constant, which represent the different fla...
std::string Name
Provides passes for computing function attributes based on interprocedural analyses.
bool WriteNewDbgInfoFormatToBitcode
Definition: BasicBlock.cpp:47
#define F(x, y, z)
Definition: MD5.cpp:55
#define I(x, y, z)
Definition: MD5.cpp:58
This is the interface to build a ModuleSummaryIndex for a module.
Module.h This file contains the declarations for the Module class.
if(VerifyEach)
FunctionAnalysisManager FAM
This header defines various interfaces for pass management in LLVM.
assert(ImpDefSCC.getReg()==AMDGPU::SCC &&ImpDefSCC.isDef())
raw_pwrite_stream & OS
bool WriteNewDbgInfoFormatToBitcode
Definition: BasicBlock.cpp:47
A manager for alias analyses.
A container for analyses that lazily runs them and caches their results.
Definition: PassManager.h:321
PassT::Result & getResult(IRUnitT &IR, ExtraArgTs... ExtraArgs)
Get the result of an analysis pass for a given IR unit.
Definition: PassManager.h:473
static AttributeList get(LLVMContext &C, ArrayRef< std::pair< unsigned, Attribute > > Attrs)
Create an AttributeList with the specified parameters in it.
Value * getArgOperand(unsigned i) const
Definition: InstrTypes.h:1687
void setArgOperand(unsigned i, Value *v)
Definition: InstrTypes.h:1692
This class represents a function call, abstracting a target machine's calling convention.
static ConstantAsMetadata * get(Constant *C)
Definition: Metadata.h:528
This is an important base class in LLVM.
Definition: Constant.h:41
void removeDeadConstantUsers() const
If there are any dead constant users dangling off of this constant, remove them.
Definition: Constants.cpp:722
This class represents an Operation in the Expression.
iterator find(const_arg_type_t< KeyT > Val)
Definition: DenseMap.h:155
std::pair< iterator, bool > try_emplace(KeyT &&Key, Ts &&... Args)
Definition: DenseMap.h:235
unsigned size() const
Definition: DenseMap.h:99
bool empty() const
Definition: DenseMap.h:98
iterator end()
Definition: DenseMap.h:84
Implements a dense probed hash-table based set.
Definition: DenseSet.h:271
static Function * Create(FunctionType *Ty, LinkageTypes Linkage, unsigned AddrSpace, const Twine &N="", Module *M=nullptr)
Definition: Function.h:163
void setAttributes(AttributeList Attrs)
Set the attribute list for this Function.
Definition: Function.h:342
void copyAttributesFrom(const Function *Src)
copyAttributesFrom - copy all additional attributes (those not needed to create a Function) from the ...
Definition: Function.cpp:791
const Comdat * getComdat() const
Definition: Globals.cpp:184
const GlobalObject * getAliaseeObject() const
Definition: Globals.cpp:375
void eraseFromParent()
This method unlinks 'this' from the containing module and deletes it.
Definition: Globals.cpp:86
@ HiddenVisibility
The GV is hidden.
Definition: GlobalValue.h:68
void setVisibility(VisibilityTypes V)
Definition: GlobalValue.h:254
@ ExternalLinkage
Externally visible function.
Definition: GlobalValue.h:52
@ AvailableExternallyLinkage
Available for inspection, not emission.
Definition: GlobalValue.h:53
An analysis over an "outer" IR unit that provides access to an analysis manager over an "inner" IR un...
Definition: PassManager.h:631
Metadata node.
Definition: Metadata.h:1067
static MDTuple * get(LLVMContext &Context, ArrayRef< Metadata * > MDs)
Definition: Metadata.h:1541
static MDString * get(LLVMContext &Context, StringRef Str)
Definition: Metadata.cpp:600
static MDTuple * get(LLVMContext &Context, ArrayRef< Metadata * > MDs)
Definition: Metadata.h:1498
static MetadataAsValue * get(LLVMContext &Context, Metadata *MD)
Definition: Metadata.cpp:103
Root of the metadata hierarchy.
Definition: Metadata.h:62
Analysis pass to provide the ModuleSummaryIndex object.
Class to hold module path string table and global value map, and encapsulate methods for operating on...
static void CollectAsmSymvers(const Module &M, function_ref< void(StringRef, StringRef)> AsmSymver)
Parse inline ASM and collect the symvers directives that are defined in the current module.
A Module instance is used to store all the information related to an LLVM module.
Definition: Module.h:65
@ Error
Emits an error if two values disagree, otherwise the resulting value is that of the operands.
Definition: Module.h:118
iterator_range< global_object_iterator > global_objects()
Definition: Module.cpp:420
GlobalValue * getNamedValue(StringRef Name) const
Return the global value in the module with the specified name, of arbitrary type.
Definition: Module.cpp:133
Comdat * getOrInsertComdat(StringRef Name)
Return the Comdat in the module with the specified name.
Definition: Module.cpp:589
void appendModuleInlineAsm(StringRef Asm)
Append to the module-scope inline assembly blocks.
Definition: Module.h:352
iterator_range< global_value_iterator > global_values()
Definition: Module.cpp:428
A tuple of MDNodes.
Definition: Metadata.h:1729
void addOperand(MDNode *M)
Definition: Metadata.cpp:1388
A set of analyses that are preserved following a run of a transformation pass.
Definition: Analysis.h:109
static PreservedAnalyses none()
Convenience factory function for the empty preserved set.
Definition: Analysis.h:112
static PreservedAnalyses all()
Construct a special preserved set that preserves all passes.
Definition: Analysis.h:115
Analysis providing profile information.
Used to temporarily set the debug info format of a function, module, or basic block for the duration ...
A vector that has set insertion semantics.
Definition: SetVector.h:57
size_type count(const key_type &key) const
Count the number of elements of a given key in the SetVector.
Definition: SetVector.h:264
bool insert(const value_type &X)
Insert a new element into the SetVector.
Definition: SetVector.h:162
bool empty() const
Definition: SmallVector.h:94
void push_back(const T &Elt)
Definition: SmallVector.h:426
This is a 'vector' (really, a variable-sized array), optimized for the case when the array is small.
Definition: SmallVector.h:1209
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:50
PreservedAnalyses run(Module &M, ModuleAnalysisManager &AM)
Twine - A lightweight data structure for efficiently representing the concatenation of temporary valu...
Definition: Twine.h:81
static Type * getVoidTy(LLVMContext &C)
static IntegerType * getInt8Ty(LLVMContext &C)
A Use represents the edge between a Value definition and its users.
Definition: Use.h:43
LLVM Value Representation.
Definition: Value.h:74
void setName(const Twine &Name)
Change the name of the value.
Definition: Value.cpp:377
bool use_empty() const
Definition: Value.h:344
iterator_range< use_iterator > uses()
Definition: Value.h:376
void takeName(Value *V)
Transfer the name from V to this value.
Definition: Value.cpp:383
std::pair< iterator, bool > insert(const ValueT &V)
Definition: DenseSet.h:206
size_type count(const_arg_type_t< ValueT > V) const
Return 1 if the specified key is in the set, 0 otherwise.
Definition: DenseSet.h:97
An efficient, type-erasing, non-owning reference to a callable.
This class implements an extremely fast bulk output stream that can only output to a stream.
Definition: raw_ostream.h:52
@ C
The default llvm calling convention, compatible with C.
Definition: CallingConv.h:34
StringRef getName(ID id)
Return the LLVM name for an intrinsic, such as "llvm.ppc.altivec.lvx".
Definition: Function.cpp:1023
bool isJumpTableCanonical(Function *F)
This is an optimization pass for GlobalISel generic memory operations.
Definition: AddressRanges.h:18
MemoryEffects computeFunctionBodyMemoryAccess(Function &F, AAResults &AAR)
Returns the memory access properties of this copy of the function.
void WriteBitcodeToFile(const Module &M, raw_ostream &Out, bool ShouldPreserveUseListOrder=false, const ModuleSummaryIndex *Index=nullptr, bool GenerateHash=false, ModuleHash *ModHash=nullptr)
Write the specified module to the specified raw output stream.
void writeThinLinkBitcodeToFile(const Module &M, raw_ostream &Out, const ModuleSummaryIndex &Index, const ModuleHash &ModHash)
Write the specified thin link bitcode file (i.e., the minimized bitcode file) to the given raw output...
void append_range(Container &C, Range &&R)
Wrapper function to append range R to container C.
Definition: STLExtras.h:2073
iterator_range< early_inc_iterator_impl< detail::IterOfRange< RangeT > > > make_early_inc_range(RangeT &&Range)
Make a range that does early increment to allow mutation of the underlying range without disrupting i...
Definition: STLExtras.h:656
bool convertToDeclaration(GlobalValue &GV)
Converts value GV to declaration, or replaces with a declaration if it is an alias.
ModuleSummaryIndex buildModuleSummaryIndex(const Module &M, std::function< BlockFrequencyInfo *(const Function &F)> GetBFICallback, ProfileSummaryInfo *PSI, std::function< const StackSafetyInfo *(const Function &F)> GetSSICallback=[](const Function &F) -> const StackSafetyInfo *{ return nullptr;})
Direct function to compute a ModuleSummaryIndex from a given module.
std::string getUniqueModuleId(Module *M)
Produce a unique identifier for this module by taking the MD5 sum of the names of the module's strong...
bool StripDebugInfo(Module &M)
Strip debug info in the module if it exists.
Definition: DebugInfo.cpp:594
void appendToCompilerUsed(Module &M, ArrayRef< GlobalValue * > Values)
Adds global values to the llvm.compiler.used list.
std::array< uint32_t, 5 > ModuleHash
160 bits SHA1
std::unique_ptr< Module > CloneModule(const Module &M)
Return an exact copy of the specified module.
Definition: CloneModule.cpp:39
void appendToUsed(Module &M, ArrayRef< GlobalValue * > Values)
Adds global values to the llvm.used list.
CfiFunctionLinkage
The type of CFI jumptable needed for a function.
@ CFL_WeakDeclaration
@ CFL_Definition
@ CFL_Declaration
GlobalVariable * collectUsedGlobalVariables(const Module &M, SmallVectorImpl< GlobalValue * > &Vec, bool CompilerUsed)
Given "llvm.used" or "llvm.compiler.used" as a global name, collect the initializer elements of that ...
Definition: Module.cpp:843