LLVM 19.0.0git
ModuleUtils.cpp
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1//===-- ModuleUtils.cpp - Functions to manipulate Modules -----------------===//
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//
9// This family of functions perform manipulations on Modules.
10//
11//===----------------------------------------------------------------------===//
12
17#include "llvm/IR/Function.h"
18#include "llvm/IR/IRBuilder.h"
19#include "llvm/IR/MDBuilder.h"
20#include "llvm/IR/Module.h"
21#include "llvm/Support/MD5.h"
23#include "llvm/Support/xxhash.h"
24
25using namespace llvm;
26
27#define DEBUG_TYPE "moduleutils"
28
29static void appendToGlobalArray(StringRef ArrayName, Module &M, Function *F,
30 int Priority, Constant *Data) {
31 IRBuilder<> IRB(M.getContext());
32 FunctionType *FnTy = FunctionType::get(IRB.getVoidTy(), false);
33
34 // Get the current set of static global constructors and add the new ctor
35 // to the list.
36 SmallVector<Constant *, 16> CurrentCtors;
37 StructType *EltTy;
38 if (GlobalVariable *GVCtor = M.getNamedGlobal(ArrayName)) {
39 EltTy = cast<StructType>(GVCtor->getValueType()->getArrayElementType());
40 if (Constant *Init = GVCtor->getInitializer()) {
41 unsigned n = Init->getNumOperands();
42 CurrentCtors.reserve(n + 1);
43 for (unsigned i = 0; i != n; ++i)
44 CurrentCtors.push_back(cast<Constant>(Init->getOperand(i)));
45 }
46 GVCtor->eraseFromParent();
47 } else {
48 EltTy = StructType::get(IRB.getInt32Ty(),
49 PointerType::get(FnTy, F->getAddressSpace()),
50 IRB.getPtrTy());
51 }
52
53 // Build a 3 field global_ctor entry. We don't take a comdat key.
54 Constant *CSVals[3];
55 CSVals[0] = IRB.getInt32(Priority);
56 CSVals[1] = F;
57 CSVals[2] = Data ? ConstantExpr::getPointerCast(Data, IRB.getPtrTy())
59 Constant *RuntimeCtorInit =
60 ConstantStruct::get(EltTy, ArrayRef(CSVals, EltTy->getNumElements()));
61
62 CurrentCtors.push_back(RuntimeCtorInit);
63
64 // Create a new initializer.
65 ArrayType *AT = ArrayType::get(EltTy, CurrentCtors.size());
66 Constant *NewInit = ConstantArray::get(AT, CurrentCtors);
67
68 // Create the new global variable and replace all uses of
69 // the old global variable with the new one.
70 (void)new GlobalVariable(M, NewInit->getType(), false,
71 GlobalValue::AppendingLinkage, NewInit, ArrayName);
72}
73
74void llvm::appendToGlobalCtors(Module &M, Function *F, int Priority, Constant *Data) {
75 appendToGlobalArray("llvm.global_ctors", M, F, Priority, Data);
76}
77
78void llvm::appendToGlobalDtors(Module &M, Function *F, int Priority, Constant *Data) {
79 appendToGlobalArray("llvm.global_dtors", M, F, Priority, Data);
80}
81
84 if (!GV || !GV->hasInitializer())
85 return;
86
87 auto *CA = cast<ConstantArray>(GV->getInitializer());
88 for (Use &Op : CA->operands())
89 Init.insert(cast<Constant>(Op));
90}
91
93 GlobalVariable *GV = M.getGlobalVariable(Name);
94
97 if (GV)
98 GV->eraseFromParent();
99
100 Type *ArrayEltTy = llvm::PointerType::getUnqual(M.getContext());
101 for (auto *V : Values)
103
104 if (Init.empty())
105 return;
106
107 ArrayType *ATy = ArrayType::get(ArrayEltTy, Init.size());
109 ConstantArray::get(ATy, Init.getArrayRef()),
110 Name);
111 GV->setSection("llvm.metadata");
112}
113
115 appendToUsedList(M, "llvm.used", Values);
116}
117
119 appendToUsedList(M, "llvm.compiler.used", Values);
120}
121
123 function_ref<bool(Constant *)> ShouldRemove) {
124 GlobalVariable *GV = M.getNamedGlobal(Name);
125 if (!GV)
126 return;
127
130
131 Type *ArrayEltTy = cast<ArrayType>(GV->getValueType())->getElementType();
132
134 for (Constant *MaybeRemoved : Init) {
135 if (!ShouldRemove(MaybeRemoved->stripPointerCasts()))
136 NewInit.push_back(MaybeRemoved);
137 }
138
139 if (!NewInit.empty()) {
140 ArrayType *ATy = ArrayType::get(ArrayEltTy, NewInit.size());
141 GlobalVariable *NewGV =
143 ConstantArray::get(ATy, NewInit), "", GV,
145 NewGV->setSection(GV->getSection());
146 NewGV->takeName(GV);
147 }
148
149 GV->eraseFromParent();
150}
151
153 function_ref<bool(Constant *)> ShouldRemove) {
154 removeFromUsedList(M, "llvm.used", ShouldRemove);
155 removeFromUsedList(M, "llvm.compiler.used", ShouldRemove);
156}
157
158void llvm::setKCFIType(Module &M, Function &F, StringRef MangledType) {
159 if (!M.getModuleFlag("kcfi"))
160 return;
161 // Matches CodeGenModule::CreateKCFITypeId in Clang.
162 LLVMContext &Ctx = M.getContext();
163 MDBuilder MDB(Ctx);
164 F.setMetadata(
165 LLVMContext::MD_kcfi_type,
166 MDNode::get(Ctx, MDB.createConstant(ConstantInt::get(
167 Type::getInt32Ty(Ctx),
168 static_cast<uint32_t>(xxHash64(MangledType))))));
169 // If the module was compiled with -fpatchable-function-entry, ensure
170 // we use the same patchable-function-prefix.
171 if (auto *MD = mdconst::extract_or_null<ConstantInt>(
172 M.getModuleFlag("kcfi-offset"))) {
173 if (unsigned Offset = MD->getZExtValue())
174 F.addFnAttr("patchable-function-prefix", std::to_string(Offset));
175 }
176}
177
179 ArrayRef<Type *> InitArgTypes,
180 bool Weak) {
181 assert(!InitName.empty() && "Expected init function name");
182 auto *VoidTy = Type::getVoidTy(M.getContext());
183 auto *FnTy = FunctionType::get(VoidTy, InitArgTypes, false);
184 auto FnCallee = M.getOrInsertFunction(InitName, FnTy);
185 auto *Fn = cast<Function>(FnCallee.getCallee());
186 if (Weak && Fn->isDeclaration())
187 Fn->setLinkage(Function::ExternalWeakLinkage);
188 return FnCallee;
189}
190
193 FunctionType::get(Type::getVoidTy(M.getContext()), false),
194 GlobalValue::InternalLinkage, M.getDataLayout().getProgramAddressSpace(),
195 CtorName, &M);
196 Ctor->addFnAttr(Attribute::NoUnwind);
197 setKCFIType(M, *Ctor, "_ZTSFvvE"); // void (*)(void)
198 BasicBlock *CtorBB = BasicBlock::Create(M.getContext(), "", Ctor);
199 ReturnInst::Create(M.getContext(), CtorBB);
200 // Ensure Ctor cannot be discarded, even if in a comdat.
201 appendToUsed(M, {Ctor});
202 return Ctor;
203}
204
205std::pair<Function *, FunctionCallee> llvm::createSanitizerCtorAndInitFunctions(
206 Module &M, StringRef CtorName, StringRef InitName,
207 ArrayRef<Type *> InitArgTypes, ArrayRef<Value *> InitArgs,
208 StringRef VersionCheckName, bool Weak) {
209 assert(!InitName.empty() && "Expected init function name");
210 assert(InitArgs.size() == InitArgTypes.size() &&
211 "Sanitizer's init function expects different number of arguments");
212 FunctionCallee InitFunction =
213 declareSanitizerInitFunction(M, InitName, InitArgTypes, Weak);
214 Function *Ctor = createSanitizerCtor(M, CtorName);
215 IRBuilder<> IRB(M.getContext());
216
217 BasicBlock *RetBB = &Ctor->getEntryBlock();
218 if (Weak) {
219 RetBB->setName("ret");
220 auto *EntryBB = BasicBlock::Create(M.getContext(), "entry", Ctor, RetBB);
221 auto *CallInitBB =
222 BasicBlock::Create(M.getContext(), "callfunc", Ctor, RetBB);
223 auto *InitFn = cast<Function>(InitFunction.getCallee());
224 auto *InitFnPtr =
225 PointerType::get(InitFn->getType(), InitFn->getAddressSpace());
226 IRB.SetInsertPoint(EntryBB);
227 Value *InitNotNull =
228 IRB.CreateICmpNE(InitFn, ConstantPointerNull::get(InitFnPtr));
229 IRB.CreateCondBr(InitNotNull, CallInitBB, RetBB);
230 IRB.SetInsertPoint(CallInitBB);
231 } else {
232 IRB.SetInsertPoint(RetBB->getTerminator());
233 }
234
235 IRB.CreateCall(InitFunction, InitArgs);
236 if (!VersionCheckName.empty()) {
237 FunctionCallee VersionCheckFunction = M.getOrInsertFunction(
238 VersionCheckName, FunctionType::get(IRB.getVoidTy(), {}, false),
239 AttributeList());
240 IRB.CreateCall(VersionCheckFunction, {});
241 }
242
243 if (Weak)
244 IRB.CreateBr(RetBB);
245
246 return std::make_pair(Ctor, InitFunction);
247}
248
249std::pair<Function *, FunctionCallee>
251 Module &M, StringRef CtorName, StringRef InitName,
252 ArrayRef<Type *> InitArgTypes, ArrayRef<Value *> InitArgs,
253 function_ref<void(Function *, FunctionCallee)> FunctionsCreatedCallback,
254 StringRef VersionCheckName, bool Weak) {
255 assert(!CtorName.empty() && "Expected ctor function name");
256
257 if (Function *Ctor = M.getFunction(CtorName))
258 // FIXME: Sink this logic into the module, similar to the handling of
259 // globals. This will make moving to a concurrent model much easier.
260 if (Ctor->arg_empty() ||
261 Ctor->getReturnType() == Type::getVoidTy(M.getContext()))
262 return {Ctor,
263 declareSanitizerInitFunction(M, InitName, InitArgTypes, Weak)};
264
265 Function *Ctor;
266 FunctionCallee InitFunction;
267 std::tie(Ctor, InitFunction) = llvm::createSanitizerCtorAndInitFunctions(
268 M, CtorName, InitName, InitArgTypes, InitArgs, VersionCheckName, Weak);
269 FunctionsCreatedCallback(Ctor, InitFunction);
270 return std::make_pair(Ctor, InitFunction);
271}
272
274 SmallVectorImpl<Function *> &DeadComdatFunctions) {
275 SmallPtrSet<Function *, 32> MaybeDeadFunctions;
276 SmallPtrSet<Comdat *, 32> MaybeDeadComdats;
277 for (Function *F : DeadComdatFunctions) {
278 MaybeDeadFunctions.insert(F);
279 if (Comdat *C = F->getComdat())
280 MaybeDeadComdats.insert(C);
281 }
282
283 // Find comdats for which all users are dead now.
284 SmallPtrSet<Comdat *, 32> DeadComdats;
285 for (Comdat *C : MaybeDeadComdats) {
286 auto IsUserDead = [&](GlobalObject *GO) {
287 auto *F = dyn_cast<Function>(GO);
288 return F && MaybeDeadFunctions.contains(F);
289 };
290 if (all_of(C->getUsers(), IsUserDead))
291 DeadComdats.insert(C);
292 }
293
294 // Only keep functions which have no comdat or a dead comdat.
295 erase_if(DeadComdatFunctions, [&](Function *F) {
296 Comdat *C = F->getComdat();
297 return C && !DeadComdats.contains(C);
298 });
299}
300
302 MD5 Md5;
303 bool ExportsSymbols = false;
304 auto AddGlobal = [&](GlobalValue &GV) {
305 if (GV.isDeclaration() || GV.getName().starts_with("llvm.") ||
306 !GV.hasExternalLinkage() || GV.hasComdat())
307 return;
308 ExportsSymbols = true;
309 Md5.update(GV.getName());
311 };
312
313 for (auto &F : *M)
314 AddGlobal(F);
315 for (auto &GV : M->globals())
316 AddGlobal(GV);
317 for (auto &GA : M->aliases())
318 AddGlobal(GA);
319 for (auto &IF : M->ifuncs())
320 AddGlobal(IF);
321
322 if (!ExportsSymbols)
323 return "";
324
326 Md5.final(R);
327
328 SmallString<32> Str;
329 MD5::stringifyResult(R, Str);
330 return ("." + Str).str();
331}
332
334 StringRef SectionName, Align Alignment) {
335 // Embed the memory buffer into the module.
336 Constant *ModuleConstant = ConstantDataArray::get(
337 M.getContext(), ArrayRef(Buf.getBufferStart(), Buf.getBufferSize()));
339 M, ModuleConstant->getType(), true, GlobalValue::PrivateLinkage,
340 ModuleConstant, "llvm.embedded.object");
342 GV->setAlignment(Alignment);
343
344 LLVMContext &Ctx = M.getContext();
345 NamedMDNode *MD = M.getOrInsertNamedMetadata("llvm.embedded.objects");
346 Metadata *MDVals[] = {ConstantAsMetadata::get(GV),
348
349 MD->addOperand(llvm::MDNode::get(Ctx, MDVals));
350 GV->setMetadata(LLVMContext::MD_exclude, llvm::MDNode::get(Ctx, {}));
351
353}
354
356 Module &M, ArrayRef<GlobalIFunc *> FilteredIFuncsToLower) {
358 ArrayRef<GlobalIFunc *> IFuncsToLower = FilteredIFuncsToLower;
359 if (FilteredIFuncsToLower.empty()) { // Default to lowering all ifuncs
360 for (GlobalIFunc &GI : M.ifuncs())
361 AllIFuncs.push_back(&GI);
362 IFuncsToLower = AllIFuncs;
363 }
364
365 bool UnhandledUsers = false;
366 LLVMContext &Ctx = M.getContext();
367 const DataLayout &DL = M.getDataLayout();
368
369 PointerType *TableEntryTy =
370 PointerType::get(Ctx, DL.getProgramAddressSpace());
371
372 ArrayType *FuncPtrTableTy =
373 ArrayType::get(TableEntryTy, IFuncsToLower.size());
374
375 Align PtrAlign = DL.getABITypeAlign(TableEntryTy);
376
377 // Create a global table of function pointers we'll initialize in a global
378 // constructor.
379 auto *FuncPtrTable = new GlobalVariable(
380 M, FuncPtrTableTy, false, GlobalValue::InternalLinkage,
381 PoisonValue::get(FuncPtrTableTy), "", nullptr,
382 GlobalVariable::NotThreadLocal, DL.getDefaultGlobalsAddressSpace());
383 FuncPtrTable->setAlignment(PtrAlign);
384
385 // Create a function to initialize the function pointer table.
386 Function *NewCtor = Function::Create(
387 FunctionType::get(Type::getVoidTy(Ctx), false), Function::InternalLinkage,
388 DL.getProgramAddressSpace(), "", &M);
389
390 BasicBlock *BB = BasicBlock::Create(Ctx, "", NewCtor);
391 IRBuilder<> InitBuilder(BB);
392
393 size_t TableIndex = 0;
394 for (GlobalIFunc *GI : IFuncsToLower) {
395 Function *ResolvedFunction = GI->getResolverFunction();
396
397 // We don't know what to pass to a resolver function taking arguments
398 //
399 // FIXME: Is this even valid? clang and gcc don't complain but this
400 // probably should be invalid IR. We could just pass through undef.
401 if (!std::empty(ResolvedFunction->getFunctionType()->params())) {
402 LLVM_DEBUG(dbgs() << "Not lowering ifunc resolver function "
403 << ResolvedFunction->getName() << " with parameters\n");
404 UnhandledUsers = true;
405 continue;
406 }
407
408 // Initialize the function pointer table.
409 CallInst *ResolvedFunc = InitBuilder.CreateCall(ResolvedFunction);
410 Value *Casted = InitBuilder.CreatePointerCast(ResolvedFunc, TableEntryTy);
411 Constant *GEP = cast<Constant>(InitBuilder.CreateConstInBoundsGEP2_32(
412 FuncPtrTableTy, FuncPtrTable, 0, TableIndex++));
413 InitBuilder.CreateAlignedStore(Casted, GEP, PtrAlign);
414
415 // Update all users to load a pointer from the global table.
416 for (User *User : make_early_inc_range(GI->users())) {
417 Instruction *UserInst = dyn_cast<Instruction>(User);
418 if (!UserInst) {
419 // TODO: Should handle constantexpr casts in user instructions. Probably
420 // can't do much about constant initializers.
421 UnhandledUsers = true;
422 continue;
423 }
424
425 IRBuilder<> UseBuilder(UserInst);
426 LoadInst *ResolvedTarget =
427 UseBuilder.CreateAlignedLoad(TableEntryTy, GEP, PtrAlign);
428 Value *ResolvedCast =
429 UseBuilder.CreatePointerCast(ResolvedTarget, GI->getType());
430 UserInst->replaceUsesOfWith(GI, ResolvedCast);
431 }
432
433 // If we handled all users, erase the ifunc.
434 if (GI->use_empty())
435 GI->eraseFromParent();
436 }
437
438 InitBuilder.CreateRetVoid();
439
440 PointerType *ConstantDataTy = PointerType::get(Ctx, 0);
441
442 // TODO: Is this the right priority? Probably should be before any other
443 // constructors?
444 const int Priority = 10;
445 appendToGlobalCtors(M, NewCtor, Priority,
446 ConstantPointerNull::get(ConstantDataTy));
447 return UnhandledUsers;
448}
MachineBasicBlock MachineBasicBlock::iterator DebugLoc DL
#define LLVM_DEBUG(X)
Definition: Debug.h:101
std::string Name
Hexagon Common GEP
#define F(x, y, z)
Definition: MD5.cpp:55
static void appendToUsedList(Module &M, StringRef Name, ArrayRef< GlobalValue * > Values)
Definition: ModuleUtils.cpp:92
static void collectUsedGlobals(GlobalVariable *GV, SmallSetVector< Constant *, 16 > &Init)
Definition: ModuleUtils.cpp:82
static void removeFromUsedList(Module &M, StringRef Name, function_ref< bool(Constant *)> ShouldRemove)
static void appendToGlobalArray(StringRef ArrayName, Module &M, Function *F, int Priority, Constant *Data)
Definition: ModuleUtils.cpp:29
Module.h This file contains the declarations for the Module class.
assert(ImpDefSCC.getReg()==AMDGPU::SCC &&ImpDefSCC.isDef())
This file defines the SmallString class.
ArrayRef - Represent a constant reference to an array (0 or more elements consecutively in memory),...
Definition: ArrayRef.h:41
size_t size() const
size - Get the array size.
Definition: ArrayRef.h:165
bool empty() const
empty - Check if the array is empty.
Definition: ArrayRef.h:160
Class to represent array types.
Definition: DerivedTypes.h:371
LLVM Basic Block Representation.
Definition: BasicBlock.h:60
static BasicBlock * Create(LLVMContext &Context, const Twine &Name="", Function *Parent=nullptr, BasicBlock *InsertBefore=nullptr)
Creates a new BasicBlock.
Definition: BasicBlock.h:199
const Instruction * getTerminator() const LLVM_READONLY
Returns the terminator instruction if the block is well formed or null if the block is not well forme...
Definition: BasicBlock.h:221
This class represents a function call, abstracting a target machine's calling convention.
static Constant * get(ArrayType *T, ArrayRef< Constant * > V)
Definition: Constants.cpp:1292
static ConstantAsMetadata * get(Constant *C)
Definition: Metadata.h:528
static Constant * get(LLVMContext &Context, ArrayRef< ElementTy > Elts)
get() constructor - Return a constant with array type with an element count and element type matching...
Definition: Constants.h:706
static Constant * getPointerCast(Constant *C, Type *Ty)
Create a BitCast, AddrSpaceCast, or a PtrToInt cast constant expression.
Definition: Constants.cpp:2177
static Constant * getPointerBitCastOrAddrSpaceCast(Constant *C, Type *Ty)
Create a BitCast or AddrSpaceCast for a pointer type depending on the address space.
Definition: Constants.cpp:2192
static ConstantPointerNull * get(PointerType *T)
Static factory methods - Return objects of the specified value.
Definition: Constants.cpp:1762
static Constant * get(StructType *T, ArrayRef< Constant * > V)
Definition: Constants.cpp:1357
This is an important base class in LLVM.
Definition: Constant.h:41
static Constant * getNullValue(Type *Ty)
Constructor to create a '0' constant of arbitrary type.
Definition: Constants.cpp:370
This class represents an Operation in the Expression.
A parsed version of the target data layout string in and methods for querying it.
Definition: DataLayout.h:110
A handy container for a FunctionType+Callee-pointer pair, which can be passed around as a single enti...
Definition: DerivedTypes.h:168
ArrayRef< Type * > params() const
Definition: DerivedTypes.h:130
void addFnAttr(Attribute::AttrKind Kind)
Add function attributes to this function.
Definition: Function.cpp:590
static Function * Create(FunctionType *Ty, LinkageTypes Linkage, unsigned AddrSpace, const Twine &N="", Module *M=nullptr)
Definition: Function.h:164
const BasicBlock & getEntryBlock() const
Definition: Function.h:790
FunctionType * getFunctionType() const
Returns the FunctionType for me.
Definition: Function.h:202
static Function * createWithDefaultAttr(FunctionType *Ty, LinkageTypes Linkage, unsigned AddrSpace, const Twine &N="", Module *M=nullptr)
Creates a function with some attributes recorded in llvm.module.flags applied.
Definition: Function.cpp:375
StringRef getSection() const
Get the custom section of this global if it has one.
Definition: GlobalObject.h:118
void setMetadata(unsigned KindID, MDNode *Node)
Set a particular kind of metadata attachment.
Definition: Metadata.cpp:1487
void setAlignment(Align Align)
Sets the alignment attribute of the GlobalObject.
Definition: Globals.cpp:133
void setSection(StringRef S)
Change the section for this global.
Definition: Globals.cpp:263
ThreadLocalMode getThreadLocalMode() const
Definition: GlobalValue.h:270
unsigned getAddressSpace() const
Definition: GlobalValue.h:204
@ PrivateLinkage
Like Internal, but omit from symbol table.
Definition: GlobalValue.h:59
@ InternalLinkage
Rename collisions when linking (static functions).
Definition: GlobalValue.h:58
@ AppendingLinkage
Special purpose, only applies to global arrays.
Definition: GlobalValue.h:57
Type * getValueType() const
Definition: GlobalValue.h:295
const Constant * getInitializer() const
getInitializer - Return the initializer for this global variable.
bool hasInitializer() const
Definitions have initializers, declarations don't.
void eraseFromParent()
eraseFromParent - This method unlinks 'this' from the containing module and deletes it.
Definition: Globals.cpp:467
LoadInst * CreateAlignedLoad(Type *Ty, Value *Ptr, MaybeAlign Align, const char *Name)
Definition: IRBuilder.h:1807
Value * CreatePointerCast(Value *V, Type *DestTy, const Twine &Name="")
Definition: IRBuilder.h:2170
IntegerType * getInt32Ty()
Fetch the type representing a 32-bit integer.
Definition: IRBuilder.h:526
Value * CreateICmpNE(Value *LHS, Value *RHS, const Twine &Name="")
Definition: IRBuilder.h:2245
ConstantInt * getInt32(uint32_t C)
Get a constant 32-bit value.
Definition: IRBuilder.h:486
BranchInst * CreateCondBr(Value *Cond, BasicBlock *True, BasicBlock *False, MDNode *BranchWeights=nullptr, MDNode *Unpredictable=nullptr)
Create a conditional 'br Cond, TrueDest, FalseDest' instruction.
Definition: IRBuilder.h:1120
ReturnInst * CreateRetVoid()
Create a 'ret void' instruction.
Definition: IRBuilder.h:1090
Value * CreateConstInBoundsGEP2_32(Type *Ty, Value *Ptr, unsigned Idx0, unsigned Idx1, const Twine &Name="")
Definition: IRBuilder.h:1912
PointerType * getPtrTy(unsigned AddrSpace=0)
Fetch the type representing a pointer.
Definition: IRBuilder.h:569
BranchInst * CreateBr(BasicBlock *Dest)
Create an unconditional 'br label X' instruction.
Definition: IRBuilder.h:1114
void SetInsertPoint(BasicBlock *TheBB)
This specifies that created instructions should be appended to the end of the specified block.
Definition: IRBuilder.h:180
Type * getVoidTy()
Fetch the type representing void.
Definition: IRBuilder.h:564
StoreInst * CreateAlignedStore(Value *Val, Value *Ptr, MaybeAlign Align, bool isVolatile=false)
Definition: IRBuilder.h:1826
CallInst * CreateCall(FunctionType *FTy, Value *Callee, ArrayRef< Value * > Args=std::nullopt, const Twine &Name="", MDNode *FPMathTag=nullptr)
Definition: IRBuilder.h:2412
This provides a uniform API for creating instructions and inserting them into a basic block: either a...
Definition: IRBuilder.h:2666
This is an important class for using LLVM in a threaded context.
Definition: LLVMContext.h:67
An instruction for reading from memory.
Definition: Instructions.h:185
Definition: MD5.h:41
void update(ArrayRef< uint8_t > Data)
Updates the hash for the byte stream provided.
Definition: MD5.cpp:189
static void stringifyResult(MD5Result &Result, SmallVectorImpl< char > &Str)
Translates the bytes in Res to a hex string that is deposited into Str.
Definition: MD5.cpp:287
void final(MD5Result &Result)
Finishes off the hash and puts the result in result.
Definition: MD5.cpp:234
ConstantAsMetadata * createConstant(Constant *C)
Return the given constant as metadata.
Definition: MDBuilder.cpp:24
static MDTuple * get(LLVMContext &Context, ArrayRef< Metadata * > MDs)
Definition: Metadata.h:1541
static MDString * get(LLVMContext &Context, StringRef Str)
Definition: Metadata.cpp:600
size_t getBufferSize() const
const char * getBufferStart() const
Root of the metadata hierarchy.
Definition: Metadata.h:62
A Module instance is used to store all the information related to an LLVM module.
Definition: Module.h:65
A tuple of MDNodes.
Definition: Metadata.h:1729
void addOperand(MDNode *M)
Definition: Metadata.cpp:1387
Class to represent pointers.
Definition: DerivedTypes.h:646
static PointerType * getUnqual(Type *ElementType)
This constructs a pointer to an object of the specified type in the default address space (address sp...
Definition: DerivedTypes.h:662
static PoisonValue * get(Type *T)
Static factory methods - Return an 'poison' object of the specified type.
Definition: Constants.cpp:1814
static ReturnInst * Create(LLVMContext &C, Value *retVal, BasicBlock::iterator InsertBefore)
std::pair< iterator, bool > insert(PtrType Ptr)
Inserts Ptr if and only if there is no element in the container equal to Ptr.
Definition: SmallPtrSet.h:342
bool contains(ConstPtrType Ptr) const
Definition: SmallPtrSet.h:366
SmallPtrSet - This class implements a set which is optimized for holding SmallSize or less elements.
Definition: SmallPtrSet.h:427
A SetVector that performs no allocations if smaller than a certain size.
Definition: SetVector.h:370
SmallString - A SmallString is just a SmallVector with methods and accessors that make it work better...
Definition: SmallString.h:26
bool empty() const
Definition: SmallVector.h:94
size_t size() const
Definition: SmallVector.h:91
This class consists of common code factored out of the SmallVector class to reduce code duplication b...
Definition: SmallVector.h:586
void reserve(size_type N)
Definition: SmallVector.h:676
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
constexpr bool empty() const
empty - Check if the string is empty.
Definition: StringRef.h:134
Class to represent struct types.
Definition: DerivedTypes.h:216
static StructType * get(LLVMContext &Context, ArrayRef< Type * > Elements, bool isPacked=false)
This static method is the primary way to create a literal StructType.
Definition: Type.cpp:373
unsigned getNumElements() const
Random access to the elements.
Definition: DerivedTypes.h:341
The instances of the Type class are immutable: once they are created, they are never changed.
Definition: Type.h:45
static Type * getVoidTy(LLVMContext &C)
static IntegerType * getInt32Ty(LLVMContext &C)
A Use represents the edge between a Value definition and its users.
Definition: Use.h:43
bool replaceUsesOfWith(Value *From, Value *To)
Replace uses of one Value with another.
Definition: User.cpp:21
LLVM Value Representation.
Definition: Value.h:74
Type * getType() const
All values are typed, get the type of this value.
Definition: Value.h:255
void setName(const Twine &Name)
Change the name of the value.
Definition: Value.cpp:377
StringRef getName() const
Return a constant reference to the value's name.
Definition: Value.cpp:309
void takeName(Value *V)
Transfer the name from V to this value.
Definition: Value.cpp:383
An efficient, type-erasing, non-owning reference to a callable.
@ C
The default llvm calling convention, compatible with C.
Definition: CallingConv.h:34
This is an optimization pass for GlobalISel generic memory operations.
Definition: AddressRanges.h:18
@ Offset
Definition: DWP.cpp:456
bool all_of(R &&range, UnaryPredicate P)
Provide wrappers to std::all_of which take ranges instead of having to pass begin/end explicitly.
Definition: STLExtras.h:1722
Function * createSanitizerCtor(Module &M, StringRef CtorName)
Creates sanitizer constructor function.
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
FunctionCallee declareSanitizerInitFunction(Module &M, StringRef InitName, ArrayRef< Type * > InitArgTypes, bool Weak=false)
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...
std::pair< Function *, FunctionCallee > getOrCreateSanitizerCtorAndInitFunctions(Module &M, StringRef CtorName, StringRef InitName, ArrayRef< Type * > InitArgTypes, ArrayRef< Value * > InitArgs, function_ref< void(Function *, FunctionCallee)> FunctionsCreatedCallback, StringRef VersionCheckName=StringRef(), bool Weak=false)
Creates sanitizer constructor function lazily.
std::pair< Function *, FunctionCallee > createSanitizerCtorAndInitFunctions(Module &M, StringRef CtorName, StringRef InitName, ArrayRef< Type * > InitArgTypes, ArrayRef< Value * > InitArgs, StringRef VersionCheckName=StringRef(), bool Weak=false)
Creates sanitizer constructor function, and calls sanitizer's init function from it.
raw_ostream & dbgs()
dbgs() - This returns a reference to a raw_ostream for debugging messages.
Definition: Debug.cpp:163
void removeFromUsedLists(Module &M, function_ref< bool(Constant *)> ShouldRemove)
Removes global values from the llvm.used and llvm.compiler.used arrays.
void appendToCompilerUsed(Module &M, ArrayRef< GlobalValue * > Values)
Adds global values to the llvm.compiler.used list.
void appendToGlobalCtors(Module &M, Function *F, int Priority, Constant *Data=nullptr)
Append F to the list of global ctors of module M with the given Priority.
Definition: ModuleUtils.cpp:74
void setKCFIType(Module &M, Function &F, StringRef MangledType)
Sets the KCFI type for the function.
void erase_if(Container &C, UnaryPredicate P)
Provide a container algorithm similar to C++ Library Fundamentals v2's erase_if which is equivalent t...
Definition: STLExtras.h:2051
void filterDeadComdatFunctions(SmallVectorImpl< Function * > &DeadComdatFunctions)
Filter out potentially dead comdat functions where other entries keep the entire comdat group alive.
void embedBufferInModule(Module &M, MemoryBufferRef Buf, StringRef SectionName, Align Alignment=Align(1))
Embed the memory buffer Buf into the module M as a global using the specified section name.
bool lowerGlobalIFuncUsersAsGlobalCtor(Module &M, ArrayRef< GlobalIFunc * > IFuncsToLower={})
Lower all calls to ifuncs by replacing uses with indirect calls loaded out of a global table initiali...
void appendToUsed(Module &M, ArrayRef< GlobalValue * > Values)
Adds global values to the llvm.used list.
void appendToGlobalDtors(Module &M, Function *F, int Priority, Constant *Data=nullptr)
Same as appendToGlobalCtors(), but for global dtors.
Definition: ModuleUtils.cpp:78
uint64_t xxHash64(llvm::StringRef Data)
Definition: xxhash.cpp:87
This struct is a compact representation of a valid (non-zero power of two) alignment.
Definition: Alignment.h:39