1 //===-- CGBuilder.h - Choose IRBuilder implementation ----------*- C++ -*-===//
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
7 //===----------------------------------------------------------------------===//
9 #ifndef LLVM_CLANG_LIB_CODEGEN_CGBUILDER_H
10 #define LLVM_CLANG_LIB_CODEGEN_CGBUILDER_H
12 #include "llvm/IR/DataLayout.h"
13 #include "llvm/IR/IRBuilder.h"
15 #include "CodeGenTypeCache.h"
20 class CodeGenFunction;
22 /// This is an IRBuilder insertion helper that forwards to
23 /// CodeGenFunction::InsertHelper, which adds necessary metadata to
25 class CGBuilderInserter : protected llvm::IRBuilderDefaultInserter {
27 CGBuilderInserter() = default;
28 explicit CGBuilderInserter(CodeGenFunction *CGF) : CGF(CGF) {}
31 /// This forwards to CodeGenFunction::InsertHelper.
32 void InsertHelper(llvm::Instruction *I, const llvm::Twine &Name,
34 llvm::BasicBlock::iterator InsertPt) const;
36 CodeGenFunction *CGF = nullptr;
39 typedef CGBuilderInserter CGBuilderInserterTy;
41 typedef llvm::IRBuilder<llvm::ConstantFolder, CGBuilderInserterTy>
44 class CGBuilderTy : public CGBuilderBaseTy {
45 /// Storing a reference to the type cache here makes it a lot easier
46 /// to build natural-feeling, target-specific IR.
47 const CodeGenTypeCache &TypeCache;
49 CGBuilderTy(const CodeGenTypeCache &TypeCache, llvm::LLVMContext &C)
50 : CGBuilderBaseTy(C), TypeCache(TypeCache) {}
51 CGBuilderTy(const CodeGenTypeCache &TypeCache,
52 llvm::LLVMContext &C, const llvm::ConstantFolder &F,
53 const CGBuilderInserterTy &Inserter)
54 : CGBuilderBaseTy(C, F, Inserter), TypeCache(TypeCache) {}
55 CGBuilderTy(const CodeGenTypeCache &TypeCache, llvm::Instruction *I)
56 : CGBuilderBaseTy(I), TypeCache(TypeCache) {}
57 CGBuilderTy(const CodeGenTypeCache &TypeCache, llvm::BasicBlock *BB)
58 : CGBuilderBaseTy(BB), TypeCache(TypeCache) {}
60 llvm::ConstantInt *getSize(CharUnits N) {
61 return llvm::ConstantInt::get(TypeCache.SizeTy, N.getQuantity());
63 llvm::ConstantInt *getSize(uint64_t N) {
64 return llvm::ConstantInt::get(TypeCache.SizeTy, N);
67 // Note that we intentionally hide the CreateLoad APIs that don't
69 llvm::LoadInst *CreateLoad(Address Addr, const llvm::Twine &Name = "") {
70 return CreateAlignedLoad(Addr.getPointer(),
71 Addr.getAlignment().getQuantity(),
74 llvm::LoadInst *CreateLoad(Address Addr, const char *Name) {
75 // This overload is required to prevent string literals from
76 // ending up in the IsVolatile overload.
77 return CreateAlignedLoad(Addr.getPointer(),
78 Addr.getAlignment().getQuantity(),
81 llvm::LoadInst *CreateLoad(Address Addr, bool IsVolatile,
82 const llvm::Twine &Name = "") {
83 return CreateAlignedLoad(Addr.getPointer(),
84 Addr.getAlignment().getQuantity(),
89 using CGBuilderBaseTy::CreateAlignedLoad;
90 llvm::LoadInst *CreateAlignedLoad(llvm::Value *Addr, CharUnits Align,
91 const llvm::Twine &Name = "") {
92 return CreateAlignedLoad(Addr, Align.getQuantity(), Name);
94 llvm::LoadInst *CreateAlignedLoad(llvm::Value *Addr, CharUnits Align,
96 return CreateAlignedLoad(Addr, Align.getQuantity(), Name);
98 llvm::LoadInst *CreateAlignedLoad(llvm::Type *Ty, llvm::Value *Addr,
100 const llvm::Twine &Name = "") {
101 assert(Addr->getType()->getPointerElementType() == Ty);
102 return CreateAlignedLoad(Addr, Align.getQuantity(), Name);
105 // Note that we intentionally hide the CreateStore APIs that don't
106 // take an alignment.
107 llvm::StoreInst *CreateStore(llvm::Value *Val, Address Addr,
108 bool IsVolatile = false) {
109 return CreateAlignedStore(Val, Addr.getPointer(),
110 Addr.getAlignment().getAsAlign(), IsVolatile);
113 using CGBuilderBaseTy::CreateAlignedStore;
114 llvm::StoreInst *CreateAlignedStore(llvm::Value *Val, llvm::Value *Addr,
115 CharUnits Align, bool IsVolatile = false) {
116 return CreateAlignedStore(Val, Addr, Align.getQuantity(), IsVolatile);
119 // FIXME: these "default-aligned" APIs should be removed,
120 // but I don't feel like fixing all the builtin code right now.
121 llvm::StoreInst *CreateDefaultAlignedStore(llvm::Value *Val,
123 bool IsVolatile = false) {
124 return CGBuilderBaseTy::CreateStore(Val, Addr, IsVolatile);
127 /// Emit a load from an i1 flag variable.
128 llvm::LoadInst *CreateFlagLoad(llvm::Value *Addr,
129 const llvm::Twine &Name = "") {
130 assert(Addr->getType()->getPointerElementType() == getInt1Ty());
131 return CreateAlignedLoad(getInt1Ty(), Addr, CharUnits::One(), Name);
134 /// Emit a store to an i1 flag variable.
135 llvm::StoreInst *CreateFlagStore(bool Value, llvm::Value *Addr) {
136 assert(Addr->getType()->getPointerElementType() == getInt1Ty());
137 return CreateAlignedStore(getInt1(Value), Addr, CharUnits::One());
140 using CGBuilderBaseTy::CreateBitCast;
141 Address CreateBitCast(Address Addr, llvm::Type *Ty,
142 const llvm::Twine &Name = "") {
143 return Address(CreateBitCast(Addr.getPointer(), Ty, Name),
144 Addr.getAlignment());
147 using CGBuilderBaseTy::CreateAddrSpaceCast;
148 Address CreateAddrSpaceCast(Address Addr, llvm::Type *Ty,
149 const llvm::Twine &Name = "") {
150 return Address(CreateAddrSpaceCast(Addr.getPointer(), Ty, Name),
151 Addr.getAlignment());
154 /// Cast the element type of the given address to a different type,
155 /// preserving information like the alignment and address space.
156 Address CreateElementBitCast(Address Addr, llvm::Type *Ty,
157 const llvm::Twine &Name = "") {
158 auto PtrTy = Ty->getPointerTo(Addr.getAddressSpace());
159 return CreateBitCast(Addr, PtrTy, Name);
162 using CGBuilderBaseTy::CreatePointerBitCastOrAddrSpaceCast;
163 Address CreatePointerBitCastOrAddrSpaceCast(Address Addr, llvm::Type *Ty,
164 const llvm::Twine &Name = "") {
166 CreatePointerBitCastOrAddrSpaceCast(Addr.getPointer(), Ty, Name);
167 return Address(Ptr, Addr.getAlignment());
171 /// %addr = {T1, T2...}* ...
173 /// %name = getelementptr inbounds %addr, i32 0, i32 index
175 /// This API assumes that drilling into a struct like this is always an
176 /// inbounds operation.
177 using CGBuilderBaseTy::CreateStructGEP;
178 Address CreateStructGEP(Address Addr, unsigned Index,
179 const llvm::Twine &Name = "") {
180 llvm::StructType *ElTy = cast<llvm::StructType>(Addr.getElementType());
181 const llvm::DataLayout &DL = BB->getParent()->getParent()->getDataLayout();
182 const llvm::StructLayout *Layout = DL.getStructLayout(ElTy);
183 auto Offset = CharUnits::fromQuantity(Layout->getElementOffset(Index));
185 return Address(CreateStructGEP(Addr.getElementType(),
186 Addr.getPointer(), Index, Name),
187 Addr.getAlignment().alignmentAtOffset(Offset));
191 /// %addr = [n x T]* ...
193 /// %name = getelementptr inbounds %addr, i64 0, i64 index
194 /// where i64 is actually the target word size.
196 /// This API assumes that drilling into an array like this is always
197 /// an inbounds operation.
198 Address CreateConstArrayGEP(Address Addr, uint64_t Index,
199 const llvm::Twine &Name = "") {
200 llvm::ArrayType *ElTy = cast<llvm::ArrayType>(Addr.getElementType());
201 const llvm::DataLayout &DL = BB->getParent()->getParent()->getDataLayout();
203 CharUnits::fromQuantity(DL.getTypeAllocSize(ElTy->getElementType()));
206 CreateInBoundsGEP(Addr.getPointer(),
207 {getSize(CharUnits::Zero()), getSize(Index)}, Name),
208 Addr.getAlignment().alignmentAtOffset(Index * EltSize));
214 /// %name = getelementptr inbounds %addr, i64 index
215 /// where i64 is actually the target word size.
216 Address CreateConstInBoundsGEP(Address Addr, uint64_t Index,
217 const llvm::Twine &Name = "") {
218 llvm::Type *ElTy = Addr.getElementType();
219 const llvm::DataLayout &DL = BB->getParent()->getParent()->getDataLayout();
220 CharUnits EltSize = CharUnits::fromQuantity(DL.getTypeAllocSize(ElTy));
222 return Address(CreateInBoundsGEP(Addr.getElementType(), Addr.getPointer(),
223 getSize(Index), Name),
224 Addr.getAlignment().alignmentAtOffset(Index * EltSize));
230 /// %name = getelementptr inbounds %addr, i64 index
231 /// where i64 is actually the target word size.
232 Address CreateConstGEP(Address Addr, uint64_t Index,
233 const llvm::Twine &Name = "") {
234 const llvm::DataLayout &DL = BB->getParent()->getParent()->getDataLayout();
236 CharUnits::fromQuantity(DL.getTypeAllocSize(Addr.getElementType()));
238 return Address(CreateGEP(Addr.getElementType(), Addr.getPointer(),
239 getSize(Index), Name),
240 Addr.getAlignment().alignmentAtOffset(Index * EltSize));
243 /// Given a pointer to i8, adjust it by a given constant offset.
244 Address CreateConstInBoundsByteGEP(Address Addr, CharUnits Offset,
245 const llvm::Twine &Name = "") {
246 assert(Addr.getElementType() == TypeCache.Int8Ty);
247 return Address(CreateInBoundsGEP(Addr.getPointer(), getSize(Offset), Name),
248 Addr.getAlignment().alignmentAtOffset(Offset));
250 Address CreateConstByteGEP(Address Addr, CharUnits Offset,
251 const llvm::Twine &Name = "") {
252 assert(Addr.getElementType() == TypeCache.Int8Ty);
253 return Address(CreateGEP(Addr.getPointer(), getSize(Offset), Name),
254 Addr.getAlignment().alignmentAtOffset(Offset));
257 using CGBuilderBaseTy::CreateConstInBoundsGEP2_32;
258 Address CreateConstInBoundsGEP2_32(Address Addr, unsigned Idx0, unsigned Idx1,
259 const llvm::Twine &Name = "") {
260 const llvm::DataLayout &DL = BB->getParent()->getParent()->getDataLayout();
262 auto *GEP = cast<llvm::GetElementPtrInst>(CreateConstInBoundsGEP2_32(
263 Addr.getElementType(), Addr.getPointer(), Idx0, Idx1, Name));
265 DL.getIndexSizeInBits(Addr.getType()->getPointerAddressSpace()), 0,
267 if (!GEP->accumulateConstantOffset(DL, Offset))
268 llvm_unreachable("offset of GEP with constants is always computable");
269 return Address(GEP, Addr.getAlignment().alignmentAtOffset(
270 CharUnits::fromQuantity(Offset.getSExtValue())));
273 using CGBuilderBaseTy::CreateMemCpy;
274 llvm::CallInst *CreateMemCpy(Address Dest, Address Src, llvm::Value *Size,
275 bool IsVolatile = false) {
276 return CreateMemCpy(Dest.getPointer(), Dest.getAlignment().getAsAlign(),
277 Src.getPointer(), Src.getAlignment().getAsAlign(), Size,
280 llvm::CallInst *CreateMemCpy(Address Dest, Address Src, uint64_t Size,
281 bool IsVolatile = false) {
282 return CreateMemCpy(Dest.getPointer(), Dest.getAlignment().getAsAlign(),
283 Src.getPointer(), Src.getAlignment().getAsAlign(), Size,
287 using CGBuilderBaseTy::CreateMemMove;
288 llvm::CallInst *CreateMemMove(Address Dest, Address Src, llvm::Value *Size,
289 bool IsVolatile = false) {
290 return CreateMemMove(Dest.getPointer(), Dest.getAlignment().getAsAlign(),
291 Src.getPointer(), Src.getAlignment().getAsAlign(),
295 using CGBuilderBaseTy::CreateMemSet;
296 llvm::CallInst *CreateMemSet(Address Dest, llvm::Value *Value,
297 llvm::Value *Size, bool IsVolatile = false) {
298 return CreateMemSet(Dest.getPointer(), Value, Size,
299 Dest.getAlignment().getAsAlign(), IsVolatile);
302 using CGBuilderBaseTy::CreatePreserveStructAccessIndex;
303 Address CreatePreserveStructAccessIndex(Address Addr,
306 llvm::MDNode *DbgInfo) {
307 llvm::StructType *ElTy = cast<llvm::StructType>(Addr.getElementType());
308 const llvm::DataLayout &DL = BB->getParent()->getParent()->getDataLayout();
309 const llvm::StructLayout *Layout = DL.getStructLayout(ElTy);
310 auto Offset = CharUnits::fromQuantity(Layout->getElementOffset(Index));
312 return Address(CreatePreserveStructAccessIndex(ElTy, Addr.getPointer(),
313 Index, FieldIndex, DbgInfo),
314 Addr.getAlignment().alignmentAtOffset(Offset));
318 } // end namespace CodeGen
319 } // end namespace clang