John McCall | fafaaef | 2013-03-07 21:37:12 +0000 | [diff] [blame] | 1 | //===--- CGAtomic.cpp - Emit LLVM IR for atomic operations ----------------===// |
| 2 | // |
| 3 | // The LLVM Compiler Infrastructure |
| 4 | // |
| 5 | // This file is distributed under the University of Illinois Open Source |
| 6 | // License. See LICENSE.TXT for details. |
| 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | // |
| 10 | // This file contains the code for emitting atomic operations. |
| 11 | // |
| 12 | //===----------------------------------------------------------------------===// |
| 13 | |
| 14 | #include "CodeGenFunction.h" |
| 15 | #include "CGCall.h" |
| 16 | #include "CodeGenModule.h" |
| 17 | #include "clang/AST/ASTContext.h" |
Mark Lacey | 8b54999 | 2013-10-30 21:53:58 +0000 | [diff] [blame] | 18 | #include "clang/CodeGen/CGFunctionInfo.h" |
Ed Schouten | e469249 | 2013-05-31 19:27:59 +0000 | [diff] [blame] | 19 | #include "llvm/ADT/StringExtras.h" |
John McCall | fafaaef | 2013-03-07 21:37:12 +0000 | [diff] [blame] | 20 | #include "llvm/IR/DataLayout.h" |
| 21 | #include "llvm/IR/Intrinsics.h" |
John McCall | 9eda3ab | 2013-03-07 21:37:17 +0000 | [diff] [blame] | 22 | #include "llvm/IR/Operator.h" |
John McCall | fafaaef | 2013-03-07 21:37:12 +0000 | [diff] [blame] | 23 | |
| 24 | using namespace clang; |
| 25 | using namespace CodeGen; |
| 26 | |
John McCall | 9eda3ab | 2013-03-07 21:37:17 +0000 | [diff] [blame] | 27 | namespace { |
| 28 | class AtomicInfo { |
| 29 | CodeGenFunction &CGF; |
| 30 | QualType AtomicTy; |
| 31 | QualType ValueTy; |
| 32 | uint64_t AtomicSizeInBits; |
| 33 | uint64_t ValueSizeInBits; |
| 34 | CharUnits AtomicAlign; |
| 35 | CharUnits ValueAlign; |
| 36 | CharUnits LValueAlign; |
| 37 | TypeEvaluationKind EvaluationKind; |
| 38 | bool UseLibcall; |
| 39 | public: |
| 40 | AtomicInfo(CodeGenFunction &CGF, LValue &lvalue) : CGF(CGF) { |
| 41 | assert(lvalue.isSimple()); |
| 42 | |
| 43 | AtomicTy = lvalue.getType(); |
| 44 | ValueTy = AtomicTy->castAs<AtomicType>()->getValueType(); |
| 45 | EvaluationKind = CGF.getEvaluationKind(ValueTy); |
| 46 | |
| 47 | ASTContext &C = CGF.getContext(); |
| 48 | |
Stephen Hines | 176edba | 2014-12-01 14:53:08 -0800 | [diff] [blame] | 49 | uint64_t ValueAlignInBits; |
| 50 | uint64_t AtomicAlignInBits; |
| 51 | TypeInfo ValueTI = C.getTypeInfo(ValueTy); |
| 52 | ValueSizeInBits = ValueTI.Width; |
| 53 | ValueAlignInBits = ValueTI.Align; |
John McCall | 9eda3ab | 2013-03-07 21:37:17 +0000 | [diff] [blame] | 54 | |
Stephen Hines | 176edba | 2014-12-01 14:53:08 -0800 | [diff] [blame] | 55 | TypeInfo AtomicTI = C.getTypeInfo(AtomicTy); |
| 56 | AtomicSizeInBits = AtomicTI.Width; |
| 57 | AtomicAlignInBits = AtomicTI.Align; |
John McCall | 9eda3ab | 2013-03-07 21:37:17 +0000 | [diff] [blame] | 58 | |
| 59 | assert(ValueSizeInBits <= AtomicSizeInBits); |
Stephen Hines | 176edba | 2014-12-01 14:53:08 -0800 | [diff] [blame] | 60 | assert(ValueAlignInBits <= AtomicAlignInBits); |
John McCall | 9eda3ab | 2013-03-07 21:37:17 +0000 | [diff] [blame] | 61 | |
Stephen Hines | 176edba | 2014-12-01 14:53:08 -0800 | [diff] [blame] | 62 | AtomicAlign = C.toCharUnitsFromBits(AtomicAlignInBits); |
| 63 | ValueAlign = C.toCharUnitsFromBits(ValueAlignInBits); |
John McCall | 9eda3ab | 2013-03-07 21:37:17 +0000 | [diff] [blame] | 64 | if (lvalue.getAlignment().isZero()) |
| 65 | lvalue.setAlignment(AtomicAlign); |
| 66 | |
| 67 | UseLibcall = |
| 68 | (AtomicSizeInBits > uint64_t(C.toBits(lvalue.getAlignment())) || |
| 69 | AtomicSizeInBits > C.getTargetInfo().getMaxAtomicInlineWidth()); |
| 70 | } |
| 71 | |
| 72 | QualType getAtomicType() const { return AtomicTy; } |
| 73 | QualType getValueType() const { return ValueTy; } |
| 74 | CharUnits getAtomicAlignment() const { return AtomicAlign; } |
| 75 | CharUnits getValueAlignment() const { return ValueAlign; } |
| 76 | uint64_t getAtomicSizeInBits() const { return AtomicSizeInBits; } |
| 77 | uint64_t getValueSizeInBits() const { return AtomicSizeInBits; } |
| 78 | TypeEvaluationKind getEvaluationKind() const { return EvaluationKind; } |
| 79 | bool shouldUseLibcall() const { return UseLibcall; } |
| 80 | |
| 81 | /// Is the atomic size larger than the underlying value type? |
| 82 | /// |
| 83 | /// Note that the absence of padding does not mean that atomic |
| 84 | /// objects are completely interchangeable with non-atomic |
| 85 | /// objects: we might have promoted the alignment of a type |
| 86 | /// without making it bigger. |
| 87 | bool hasPadding() const { |
| 88 | return (ValueSizeInBits != AtomicSizeInBits); |
| 89 | } |
| 90 | |
Eli Friedman | 336d9df | 2013-07-11 01:32:21 +0000 | [diff] [blame] | 91 | bool emitMemSetZeroIfNecessary(LValue dest) const; |
John McCall | 9eda3ab | 2013-03-07 21:37:17 +0000 | [diff] [blame] | 92 | |
| 93 | llvm::Value *getAtomicSizeValue() const { |
| 94 | CharUnits size = CGF.getContext().toCharUnitsFromBits(AtomicSizeInBits); |
| 95 | return CGF.CGM.getSize(size); |
| 96 | } |
| 97 | |
| 98 | /// Cast the given pointer to an integer pointer suitable for |
| 99 | /// atomic operations. |
| 100 | llvm::Value *emitCastToAtomicIntPointer(llvm::Value *addr) const; |
| 101 | |
| 102 | /// Turn an atomic-layout object into an r-value. |
| 103 | RValue convertTempToRValue(llvm::Value *addr, |
Nick Lewycky | 4ee7dc2 | 2013-10-02 02:29:49 +0000 | [diff] [blame] | 104 | AggValueSlot resultSlot, |
| 105 | SourceLocation loc) const; |
John McCall | 9eda3ab | 2013-03-07 21:37:17 +0000 | [diff] [blame] | 106 | |
| 107 | /// Copy an atomic r-value into atomic-layout memory. |
| 108 | void emitCopyIntoMemory(RValue rvalue, LValue lvalue) const; |
| 109 | |
| 110 | /// Project an l-value down to the value field. |
| 111 | LValue projectValue(LValue lvalue) const { |
| 112 | llvm::Value *addr = lvalue.getAddress(); |
| 113 | if (hasPadding()) |
| 114 | addr = CGF.Builder.CreateStructGEP(addr, 0); |
| 115 | |
| 116 | return LValue::MakeAddr(addr, getValueType(), lvalue.getAlignment(), |
| 117 | CGF.getContext(), lvalue.getTBAAInfo()); |
| 118 | } |
| 119 | |
| 120 | /// Materialize an atomic r-value in atomic-layout memory. |
| 121 | llvm::Value *materializeRValue(RValue rvalue) const; |
| 122 | |
| 123 | private: |
| 124 | bool requiresMemSetZero(llvm::Type *type) const; |
| 125 | }; |
| 126 | } |
| 127 | |
| 128 | static RValue emitAtomicLibcall(CodeGenFunction &CGF, |
| 129 | StringRef fnName, |
| 130 | QualType resultType, |
| 131 | CallArgList &args) { |
| 132 | const CGFunctionInfo &fnInfo = |
| 133 | CGF.CGM.getTypes().arrangeFreeFunctionCall(resultType, args, |
| 134 | FunctionType::ExtInfo(), RequiredArgs::All); |
| 135 | llvm::FunctionType *fnTy = CGF.CGM.getTypes().GetFunctionType(fnInfo); |
| 136 | llvm::Constant *fn = CGF.CGM.CreateRuntimeFunction(fnTy, fnName); |
| 137 | return CGF.EmitCall(fnInfo, fn, ReturnValueSlot(), args); |
| 138 | } |
| 139 | |
| 140 | /// Does a store of the given IR type modify the full expected width? |
| 141 | static bool isFullSizeType(CodeGenModule &CGM, llvm::Type *type, |
| 142 | uint64_t expectedSize) { |
| 143 | return (CGM.getDataLayout().getTypeStoreSize(type) * 8 == expectedSize); |
| 144 | } |
| 145 | |
| 146 | /// Does the atomic type require memsetting to zero before initialization? |
| 147 | /// |
| 148 | /// The IR type is provided as a way of making certain queries faster. |
| 149 | bool AtomicInfo::requiresMemSetZero(llvm::Type *type) const { |
| 150 | // If the atomic type has size padding, we definitely need a memset. |
| 151 | if (hasPadding()) return true; |
| 152 | |
| 153 | // Otherwise, do some simple heuristics to try to avoid it: |
| 154 | switch (getEvaluationKind()) { |
| 155 | // For scalars and complexes, check whether the store size of the |
| 156 | // type uses the full size. |
| 157 | case TEK_Scalar: |
| 158 | return !isFullSizeType(CGF.CGM, type, AtomicSizeInBits); |
| 159 | case TEK_Complex: |
| 160 | return !isFullSizeType(CGF.CGM, type->getStructElementType(0), |
| 161 | AtomicSizeInBits / 2); |
| 162 | |
Eli Friedman | 336d9df | 2013-07-11 01:32:21 +0000 | [diff] [blame] | 163 | // Padding in structs has an undefined bit pattern. User beware. |
John McCall | 9eda3ab | 2013-03-07 21:37:17 +0000 | [diff] [blame] | 164 | case TEK_Aggregate: |
Eli Friedman | 336d9df | 2013-07-11 01:32:21 +0000 | [diff] [blame] | 165 | return false; |
John McCall | 9eda3ab | 2013-03-07 21:37:17 +0000 | [diff] [blame] | 166 | } |
| 167 | llvm_unreachable("bad evaluation kind"); |
| 168 | } |
| 169 | |
Eli Friedman | 336d9df | 2013-07-11 01:32:21 +0000 | [diff] [blame] | 170 | bool AtomicInfo::emitMemSetZeroIfNecessary(LValue dest) const { |
John McCall | 9eda3ab | 2013-03-07 21:37:17 +0000 | [diff] [blame] | 171 | llvm::Value *addr = dest.getAddress(); |
| 172 | if (!requiresMemSetZero(addr->getType()->getPointerElementType())) |
Eli Friedman | 336d9df | 2013-07-11 01:32:21 +0000 | [diff] [blame] | 173 | return false; |
John McCall | 9eda3ab | 2013-03-07 21:37:17 +0000 | [diff] [blame] | 174 | |
| 175 | CGF.Builder.CreateMemSet(addr, llvm::ConstantInt::get(CGF.Int8Ty, 0), |
| 176 | AtomicSizeInBits / 8, |
| 177 | dest.getAlignment().getQuantity()); |
Eli Friedman | 336d9df | 2013-07-11 01:32:21 +0000 | [diff] [blame] | 178 | return true; |
John McCall | 9eda3ab | 2013-03-07 21:37:17 +0000 | [diff] [blame] | 179 | } |
| 180 | |
Stephen Hines | c568f1e | 2014-07-21 00:47:37 -0700 | [diff] [blame] | 181 | static void emitAtomicCmpXchg(CodeGenFunction &CGF, AtomicExpr *E, bool IsWeak, |
Stephen Hines | 651f13c | 2014-04-23 16:59:28 -0700 | [diff] [blame] | 182 | llvm::Value *Dest, llvm::Value *Ptr, |
| 183 | llvm::Value *Val1, llvm::Value *Val2, |
| 184 | uint64_t Size, unsigned Align, |
| 185 | llvm::AtomicOrdering SuccessOrder, |
| 186 | llvm::AtomicOrdering FailureOrder) { |
| 187 | // Note that cmpxchg doesn't support weak cmpxchg, at least at the moment. |
| 188 | llvm::LoadInst *Expected = CGF.Builder.CreateLoad(Val1); |
| 189 | Expected->setAlignment(Align); |
| 190 | llvm::LoadInst *Desired = CGF.Builder.CreateLoad(Val2); |
| 191 | Desired->setAlignment(Align); |
| 192 | |
Stephen Hines | c568f1e | 2014-07-21 00:47:37 -0700 | [diff] [blame] | 193 | llvm::AtomicCmpXchgInst *Pair = CGF.Builder.CreateAtomicCmpXchg( |
Stephen Hines | 651f13c | 2014-04-23 16:59:28 -0700 | [diff] [blame] | 194 | Ptr, Expected, Desired, SuccessOrder, FailureOrder); |
Stephen Hines | c568f1e | 2014-07-21 00:47:37 -0700 | [diff] [blame] | 195 | Pair->setVolatile(E->isVolatile()); |
| 196 | Pair->setWeak(IsWeak); |
Stephen Hines | 651f13c | 2014-04-23 16:59:28 -0700 | [diff] [blame] | 197 | |
| 198 | // Cmp holds the result of the compare-exchange operation: true on success, |
| 199 | // false on failure. |
Stephen Hines | c568f1e | 2014-07-21 00:47:37 -0700 | [diff] [blame] | 200 | llvm::Value *Old = CGF.Builder.CreateExtractValue(Pair, 0); |
| 201 | llvm::Value *Cmp = CGF.Builder.CreateExtractValue(Pair, 1); |
Stephen Hines | 651f13c | 2014-04-23 16:59:28 -0700 | [diff] [blame] | 202 | |
| 203 | // This basic block is used to hold the store instruction if the operation |
| 204 | // failed. |
| 205 | llvm::BasicBlock *StoreExpectedBB = |
| 206 | CGF.createBasicBlock("cmpxchg.store_expected", CGF.CurFn); |
| 207 | |
| 208 | // This basic block is the exit point of the operation, we should end up |
| 209 | // here regardless of whether or not the operation succeeded. |
| 210 | llvm::BasicBlock *ContinueBB = |
| 211 | CGF.createBasicBlock("cmpxchg.continue", CGF.CurFn); |
| 212 | |
| 213 | // Update Expected if Expected isn't equal to Old, otherwise branch to the |
| 214 | // exit point. |
| 215 | CGF.Builder.CreateCondBr(Cmp, ContinueBB, StoreExpectedBB); |
| 216 | |
| 217 | CGF.Builder.SetInsertPoint(StoreExpectedBB); |
| 218 | // Update the memory at Expected with Old's value. |
| 219 | llvm::StoreInst *StoreExpected = CGF.Builder.CreateStore(Old, Val1); |
| 220 | StoreExpected->setAlignment(Align); |
| 221 | // Finally, branch to the exit point. |
| 222 | CGF.Builder.CreateBr(ContinueBB); |
| 223 | |
| 224 | CGF.Builder.SetInsertPoint(ContinueBB); |
| 225 | // Update the memory at Dest with Cmp's value. |
| 226 | CGF.EmitStoreOfScalar(Cmp, CGF.MakeAddrLValue(Dest, E->getType())); |
| 227 | return; |
| 228 | } |
| 229 | |
| 230 | /// Given an ordering required on success, emit all possible cmpxchg |
| 231 | /// instructions to cope with the provided (but possibly only dynamically known) |
| 232 | /// FailureOrder. |
| 233 | static void emitAtomicCmpXchgFailureSet(CodeGenFunction &CGF, AtomicExpr *E, |
Stephen Hines | c568f1e | 2014-07-21 00:47:37 -0700 | [diff] [blame] | 234 | bool IsWeak, llvm::Value *Dest, |
| 235 | llvm::Value *Ptr, llvm::Value *Val1, |
| 236 | llvm::Value *Val2, |
Stephen Hines | 651f13c | 2014-04-23 16:59:28 -0700 | [diff] [blame] | 237 | llvm::Value *FailureOrderVal, |
| 238 | uint64_t Size, unsigned Align, |
| 239 | llvm::AtomicOrdering SuccessOrder) { |
| 240 | llvm::AtomicOrdering FailureOrder; |
| 241 | if (llvm::ConstantInt *FO = dyn_cast<llvm::ConstantInt>(FailureOrderVal)) { |
| 242 | switch (FO->getSExtValue()) { |
| 243 | default: |
| 244 | FailureOrder = llvm::Monotonic; |
| 245 | break; |
| 246 | case AtomicExpr::AO_ABI_memory_order_consume: |
| 247 | case AtomicExpr::AO_ABI_memory_order_acquire: |
| 248 | FailureOrder = llvm::Acquire; |
| 249 | break; |
| 250 | case AtomicExpr::AO_ABI_memory_order_seq_cst: |
| 251 | FailureOrder = llvm::SequentiallyConsistent; |
| 252 | break; |
| 253 | } |
| 254 | if (FailureOrder >= SuccessOrder) { |
| 255 | // Don't assert on undefined behaviour. |
| 256 | FailureOrder = |
| 257 | llvm::AtomicCmpXchgInst::getStrongestFailureOrdering(SuccessOrder); |
| 258 | } |
Stephen Hines | c568f1e | 2014-07-21 00:47:37 -0700 | [diff] [blame] | 259 | emitAtomicCmpXchg(CGF, E, IsWeak, Dest, Ptr, Val1, Val2, Size, Align, |
| 260 | SuccessOrder, FailureOrder); |
Stephen Hines | 651f13c | 2014-04-23 16:59:28 -0700 | [diff] [blame] | 261 | return; |
| 262 | } |
| 263 | |
| 264 | // Create all the relevant BB's |
Stephen Hines | 6bcf27b | 2014-05-29 04:14:42 -0700 | [diff] [blame] | 265 | llvm::BasicBlock *MonotonicBB = nullptr, *AcquireBB = nullptr, |
| 266 | *SeqCstBB = nullptr; |
Stephen Hines | 651f13c | 2014-04-23 16:59:28 -0700 | [diff] [blame] | 267 | MonotonicBB = CGF.createBasicBlock("monotonic_fail", CGF.CurFn); |
| 268 | if (SuccessOrder != llvm::Monotonic && SuccessOrder != llvm::Release) |
| 269 | AcquireBB = CGF.createBasicBlock("acquire_fail", CGF.CurFn); |
| 270 | if (SuccessOrder == llvm::SequentiallyConsistent) |
| 271 | SeqCstBB = CGF.createBasicBlock("seqcst_fail", CGF.CurFn); |
| 272 | |
| 273 | llvm::BasicBlock *ContBB = CGF.createBasicBlock("atomic.continue", CGF.CurFn); |
| 274 | |
| 275 | llvm::SwitchInst *SI = CGF.Builder.CreateSwitch(FailureOrderVal, MonotonicBB); |
| 276 | |
| 277 | // Emit all the different atomics |
| 278 | |
| 279 | // MonotonicBB is arbitrarily chosen as the default case; in practice, this |
| 280 | // doesn't matter unless someone is crazy enough to use something that |
| 281 | // doesn't fold to a constant for the ordering. |
| 282 | CGF.Builder.SetInsertPoint(MonotonicBB); |
Stephen Hines | c568f1e | 2014-07-21 00:47:37 -0700 | [diff] [blame] | 283 | emitAtomicCmpXchg(CGF, E, IsWeak, Dest, Ptr, Val1, Val2, |
Stephen Hines | 651f13c | 2014-04-23 16:59:28 -0700 | [diff] [blame] | 284 | Size, Align, SuccessOrder, llvm::Monotonic); |
| 285 | CGF.Builder.CreateBr(ContBB); |
| 286 | |
| 287 | if (AcquireBB) { |
| 288 | CGF.Builder.SetInsertPoint(AcquireBB); |
Stephen Hines | c568f1e | 2014-07-21 00:47:37 -0700 | [diff] [blame] | 289 | emitAtomicCmpXchg(CGF, E, IsWeak, Dest, Ptr, Val1, Val2, |
Stephen Hines | 651f13c | 2014-04-23 16:59:28 -0700 | [diff] [blame] | 290 | Size, Align, SuccessOrder, llvm::Acquire); |
| 291 | CGF.Builder.CreateBr(ContBB); |
| 292 | SI->addCase(CGF.Builder.getInt32(AtomicExpr::AO_ABI_memory_order_consume), |
| 293 | AcquireBB); |
| 294 | SI->addCase(CGF.Builder.getInt32(AtomicExpr::AO_ABI_memory_order_acquire), |
| 295 | AcquireBB); |
| 296 | } |
| 297 | if (SeqCstBB) { |
| 298 | CGF.Builder.SetInsertPoint(SeqCstBB); |
Stephen Hines | c568f1e | 2014-07-21 00:47:37 -0700 | [diff] [blame] | 299 | emitAtomicCmpXchg(CGF, E, IsWeak, Dest, Ptr, Val1, Val2, |
Stephen Hines | 651f13c | 2014-04-23 16:59:28 -0700 | [diff] [blame] | 300 | Size, Align, SuccessOrder, llvm::SequentiallyConsistent); |
| 301 | CGF.Builder.CreateBr(ContBB); |
| 302 | SI->addCase(CGF.Builder.getInt32(AtomicExpr::AO_ABI_memory_order_seq_cst), |
| 303 | SeqCstBB); |
| 304 | } |
| 305 | |
| 306 | CGF.Builder.SetInsertPoint(ContBB); |
| 307 | } |
| 308 | |
| 309 | static void EmitAtomicOp(CodeGenFunction &CGF, AtomicExpr *E, llvm::Value *Dest, |
| 310 | llvm::Value *Ptr, llvm::Value *Val1, llvm::Value *Val2, |
Stephen Hines | c568f1e | 2014-07-21 00:47:37 -0700 | [diff] [blame] | 311 | llvm::Value *IsWeak, llvm::Value *FailureOrder, |
| 312 | uint64_t Size, unsigned Align, |
| 313 | llvm::AtomicOrdering Order) { |
John McCall | fafaaef | 2013-03-07 21:37:12 +0000 | [diff] [blame] | 314 | llvm::AtomicRMWInst::BinOp Op = llvm::AtomicRMWInst::Add; |
| 315 | llvm::Instruction::BinaryOps PostOp = (llvm::Instruction::BinaryOps)0; |
| 316 | |
| 317 | switch (E->getOp()) { |
| 318 | case AtomicExpr::AO__c11_atomic_init: |
| 319 | llvm_unreachable("Already handled!"); |
| 320 | |
| 321 | case AtomicExpr::AO__c11_atomic_compare_exchange_strong: |
Stephen Hines | c568f1e | 2014-07-21 00:47:37 -0700 | [diff] [blame] | 322 | emitAtomicCmpXchgFailureSet(CGF, E, false, Dest, Ptr, Val1, Val2, |
| 323 | FailureOrder, Size, Align, Order); |
John McCall | fafaaef | 2013-03-07 21:37:12 +0000 | [diff] [blame] | 324 | return; |
Stephen Hines | c568f1e | 2014-07-21 00:47:37 -0700 | [diff] [blame] | 325 | case AtomicExpr::AO__c11_atomic_compare_exchange_weak: |
| 326 | emitAtomicCmpXchgFailureSet(CGF, E, true, Dest, Ptr, Val1, Val2, |
| 327 | FailureOrder, Size, Align, Order); |
| 328 | return; |
| 329 | case AtomicExpr::AO__atomic_compare_exchange: |
| 330 | case AtomicExpr::AO__atomic_compare_exchange_n: { |
| 331 | if (llvm::ConstantInt *IsWeakC = dyn_cast<llvm::ConstantInt>(IsWeak)) { |
| 332 | emitAtomicCmpXchgFailureSet(CGF, E, IsWeakC->getZExtValue(), Dest, Ptr, |
| 333 | Val1, Val2, FailureOrder, Size, Align, Order); |
| 334 | } else { |
| 335 | // Create all the relevant BB's |
| 336 | llvm::BasicBlock *StrongBB = |
| 337 | CGF.createBasicBlock("cmpxchg.strong", CGF.CurFn); |
| 338 | llvm::BasicBlock *WeakBB = CGF.createBasicBlock("cmxchg.weak", CGF.CurFn); |
| 339 | llvm::BasicBlock *ContBB = |
| 340 | CGF.createBasicBlock("cmpxchg.continue", CGF.CurFn); |
| 341 | |
| 342 | llvm::SwitchInst *SI = CGF.Builder.CreateSwitch(IsWeak, WeakBB); |
| 343 | SI->addCase(CGF.Builder.getInt1(false), StrongBB); |
| 344 | |
| 345 | CGF.Builder.SetInsertPoint(StrongBB); |
| 346 | emitAtomicCmpXchgFailureSet(CGF, E, false, Dest, Ptr, Val1, Val2, |
| 347 | FailureOrder, Size, Align, Order); |
| 348 | CGF.Builder.CreateBr(ContBB); |
| 349 | |
| 350 | CGF.Builder.SetInsertPoint(WeakBB); |
| 351 | emitAtomicCmpXchgFailureSet(CGF, E, true, Dest, Ptr, Val1, Val2, |
| 352 | FailureOrder, Size, Align, Order); |
| 353 | CGF.Builder.CreateBr(ContBB); |
| 354 | |
| 355 | CGF.Builder.SetInsertPoint(ContBB); |
| 356 | } |
| 357 | return; |
| 358 | } |
John McCall | fafaaef | 2013-03-07 21:37:12 +0000 | [diff] [blame] | 359 | case AtomicExpr::AO__c11_atomic_load: |
| 360 | case AtomicExpr::AO__atomic_load_n: |
| 361 | case AtomicExpr::AO__atomic_load: { |
| 362 | llvm::LoadInst *Load = CGF.Builder.CreateLoad(Ptr); |
| 363 | Load->setAtomic(Order); |
| 364 | Load->setAlignment(Size); |
| 365 | Load->setVolatile(E->isVolatile()); |
| 366 | llvm::StoreInst *StoreDest = CGF.Builder.CreateStore(Load, Dest); |
| 367 | StoreDest->setAlignment(Align); |
| 368 | return; |
| 369 | } |
| 370 | |
| 371 | case AtomicExpr::AO__c11_atomic_store: |
| 372 | case AtomicExpr::AO__atomic_store: |
| 373 | case AtomicExpr::AO__atomic_store_n: { |
| 374 | assert(!Dest && "Store does not return a value"); |
| 375 | llvm::LoadInst *LoadVal1 = CGF.Builder.CreateLoad(Val1); |
| 376 | LoadVal1->setAlignment(Align); |
| 377 | llvm::StoreInst *Store = CGF.Builder.CreateStore(LoadVal1, Ptr); |
| 378 | Store->setAtomic(Order); |
| 379 | Store->setAlignment(Size); |
| 380 | Store->setVolatile(E->isVolatile()); |
| 381 | return; |
| 382 | } |
| 383 | |
| 384 | case AtomicExpr::AO__c11_atomic_exchange: |
| 385 | case AtomicExpr::AO__atomic_exchange_n: |
| 386 | case AtomicExpr::AO__atomic_exchange: |
| 387 | Op = llvm::AtomicRMWInst::Xchg; |
| 388 | break; |
| 389 | |
| 390 | case AtomicExpr::AO__atomic_add_fetch: |
| 391 | PostOp = llvm::Instruction::Add; |
| 392 | // Fall through. |
| 393 | case AtomicExpr::AO__c11_atomic_fetch_add: |
| 394 | case AtomicExpr::AO__atomic_fetch_add: |
| 395 | Op = llvm::AtomicRMWInst::Add; |
| 396 | break; |
| 397 | |
| 398 | case AtomicExpr::AO__atomic_sub_fetch: |
| 399 | PostOp = llvm::Instruction::Sub; |
| 400 | // Fall through. |
| 401 | case AtomicExpr::AO__c11_atomic_fetch_sub: |
| 402 | case AtomicExpr::AO__atomic_fetch_sub: |
| 403 | Op = llvm::AtomicRMWInst::Sub; |
| 404 | break; |
| 405 | |
| 406 | case AtomicExpr::AO__atomic_and_fetch: |
| 407 | PostOp = llvm::Instruction::And; |
| 408 | // Fall through. |
| 409 | case AtomicExpr::AO__c11_atomic_fetch_and: |
| 410 | case AtomicExpr::AO__atomic_fetch_and: |
| 411 | Op = llvm::AtomicRMWInst::And; |
| 412 | break; |
| 413 | |
| 414 | case AtomicExpr::AO__atomic_or_fetch: |
| 415 | PostOp = llvm::Instruction::Or; |
| 416 | // Fall through. |
| 417 | case AtomicExpr::AO__c11_atomic_fetch_or: |
| 418 | case AtomicExpr::AO__atomic_fetch_or: |
| 419 | Op = llvm::AtomicRMWInst::Or; |
| 420 | break; |
| 421 | |
| 422 | case AtomicExpr::AO__atomic_xor_fetch: |
| 423 | PostOp = llvm::Instruction::Xor; |
| 424 | // Fall through. |
| 425 | case AtomicExpr::AO__c11_atomic_fetch_xor: |
| 426 | case AtomicExpr::AO__atomic_fetch_xor: |
| 427 | Op = llvm::AtomicRMWInst::Xor; |
| 428 | break; |
| 429 | |
| 430 | case AtomicExpr::AO__atomic_nand_fetch: |
| 431 | PostOp = llvm::Instruction::And; |
| 432 | // Fall through. |
| 433 | case AtomicExpr::AO__atomic_fetch_nand: |
| 434 | Op = llvm::AtomicRMWInst::Nand; |
| 435 | break; |
| 436 | } |
| 437 | |
| 438 | llvm::LoadInst *LoadVal1 = CGF.Builder.CreateLoad(Val1); |
| 439 | LoadVal1->setAlignment(Align); |
| 440 | llvm::AtomicRMWInst *RMWI = |
| 441 | CGF.Builder.CreateAtomicRMW(Op, Ptr, LoadVal1, Order); |
| 442 | RMWI->setVolatile(E->isVolatile()); |
| 443 | |
| 444 | // For __atomic_*_fetch operations, perform the operation again to |
| 445 | // determine the value which was written. |
| 446 | llvm::Value *Result = RMWI; |
| 447 | if (PostOp) |
| 448 | Result = CGF.Builder.CreateBinOp(PostOp, RMWI, LoadVal1); |
| 449 | if (E->getOp() == AtomicExpr::AO__atomic_nand_fetch) |
| 450 | Result = CGF.Builder.CreateNot(Result); |
| 451 | llvm::StoreInst *StoreDest = CGF.Builder.CreateStore(Result, Dest); |
| 452 | StoreDest->setAlignment(Align); |
| 453 | } |
| 454 | |
| 455 | // This function emits any expression (scalar, complex, or aggregate) |
| 456 | // into a temporary alloca. |
| 457 | static llvm::Value * |
| 458 | EmitValToTemp(CodeGenFunction &CGF, Expr *E) { |
| 459 | llvm::Value *DeclPtr = CGF.CreateMemTemp(E->getType(), ".atomictmp"); |
| 460 | CGF.EmitAnyExprToMem(E, DeclPtr, E->getType().getQualifiers(), |
| 461 | /*Init*/ true); |
| 462 | return DeclPtr; |
| 463 | } |
| 464 | |
Ed Schouten | e469249 | 2013-05-31 19:27:59 +0000 | [diff] [blame] | 465 | static void |
| 466 | AddDirectArgument(CodeGenFunction &CGF, CallArgList &Args, |
Nick Lewycky | 4ee7dc2 | 2013-10-02 02:29:49 +0000 | [diff] [blame] | 467 | bool UseOptimizedLibcall, llvm::Value *Val, QualType ValTy, |
Stephen Hines | 176edba | 2014-12-01 14:53:08 -0800 | [diff] [blame] | 468 | SourceLocation Loc, CharUnits SizeInChars) { |
Ed Schouten | e469249 | 2013-05-31 19:27:59 +0000 | [diff] [blame] | 469 | if (UseOptimizedLibcall) { |
| 470 | // Load value and pass it to the function directly. |
| 471 | unsigned Align = CGF.getContext().getTypeAlignInChars(ValTy).getQuantity(); |
Stephen Hines | 176edba | 2014-12-01 14:53:08 -0800 | [diff] [blame] | 472 | int64_t SizeInBits = CGF.getContext().toBits(SizeInChars); |
| 473 | ValTy = |
| 474 | CGF.getContext().getIntTypeForBitwidth(SizeInBits, /*Signed=*/false); |
| 475 | llvm::Type *IPtrTy = llvm::IntegerType::get(CGF.getLLVMContext(), |
| 476 | SizeInBits)->getPointerTo(); |
| 477 | Val = CGF.EmitLoadOfScalar(CGF.Builder.CreateBitCast(Val, IPtrTy), false, |
| 478 | Align, CGF.getContext().getPointerType(ValTy), |
| 479 | Loc); |
| 480 | // Coerce the value into an appropriately sized integer type. |
Ed Schouten | e469249 | 2013-05-31 19:27:59 +0000 | [diff] [blame] | 481 | Args.add(RValue::get(Val), ValTy); |
| 482 | } else { |
| 483 | // Non-optimized functions always take a reference. |
| 484 | Args.add(RValue::get(CGF.EmitCastToVoidPtr(Val)), |
| 485 | CGF.getContext().VoidPtrTy); |
| 486 | } |
| 487 | } |
| 488 | |
John McCall | fafaaef | 2013-03-07 21:37:12 +0000 | [diff] [blame] | 489 | RValue CodeGenFunction::EmitAtomicExpr(AtomicExpr *E, llvm::Value *Dest) { |
| 490 | QualType AtomicTy = E->getPtr()->getType()->getPointeeType(); |
| 491 | QualType MemTy = AtomicTy; |
| 492 | if (const AtomicType *AT = AtomicTy->getAs<AtomicType>()) |
| 493 | MemTy = AT->getValueType(); |
| 494 | CharUnits sizeChars = getContext().getTypeSizeInChars(AtomicTy); |
| 495 | uint64_t Size = sizeChars.getQuantity(); |
| 496 | CharUnits alignChars = getContext().getTypeAlignInChars(AtomicTy); |
| 497 | unsigned Align = alignChars.getQuantity(); |
| 498 | unsigned MaxInlineWidthInBits = |
John McCall | 64aa4b3 | 2013-04-16 22:48:15 +0000 | [diff] [blame] | 499 | getTarget().getMaxAtomicInlineWidth(); |
John McCall | fafaaef | 2013-03-07 21:37:12 +0000 | [diff] [blame] | 500 | bool UseLibcall = (Size != Align || |
| 501 | getContext().toBits(sizeChars) > MaxInlineWidthInBits); |
| 502 | |
Stephen Hines | c568f1e | 2014-07-21 00:47:37 -0700 | [diff] [blame] | 503 | llvm::Value *IsWeak = nullptr, *OrderFail = nullptr, *Val1 = nullptr, |
| 504 | *Val2 = nullptr; |
Stephen Hines | 6bcf27b | 2014-05-29 04:14:42 -0700 | [diff] [blame] | 505 | llvm::Value *Ptr = EmitScalarExpr(E->getPtr()); |
John McCall | fafaaef | 2013-03-07 21:37:12 +0000 | [diff] [blame] | 506 | |
| 507 | if (E->getOp() == AtomicExpr::AO__c11_atomic_init) { |
| 508 | assert(!Dest && "Init does not return a value"); |
John McCall | 9eda3ab | 2013-03-07 21:37:17 +0000 | [diff] [blame] | 509 | LValue lvalue = LValue::MakeAddr(Ptr, AtomicTy, alignChars, getContext()); |
| 510 | EmitAtomicInit(E->getVal1(), lvalue); |
Stephen Hines | 6bcf27b | 2014-05-29 04:14:42 -0700 | [diff] [blame] | 511 | return RValue::get(nullptr); |
John McCall | fafaaef | 2013-03-07 21:37:12 +0000 | [diff] [blame] | 512 | } |
| 513 | |
Stephen Hines | 6bcf27b | 2014-05-29 04:14:42 -0700 | [diff] [blame] | 514 | llvm::Value *Order = EmitScalarExpr(E->getOrder()); |
John McCall | fafaaef | 2013-03-07 21:37:12 +0000 | [diff] [blame] | 515 | |
| 516 | switch (E->getOp()) { |
| 517 | case AtomicExpr::AO__c11_atomic_init: |
| 518 | llvm_unreachable("Already handled!"); |
| 519 | |
| 520 | case AtomicExpr::AO__c11_atomic_load: |
| 521 | case AtomicExpr::AO__atomic_load_n: |
| 522 | break; |
| 523 | |
| 524 | case AtomicExpr::AO__atomic_load: |
| 525 | Dest = EmitScalarExpr(E->getVal1()); |
| 526 | break; |
| 527 | |
| 528 | case AtomicExpr::AO__atomic_store: |
| 529 | Val1 = EmitScalarExpr(E->getVal1()); |
| 530 | break; |
| 531 | |
| 532 | case AtomicExpr::AO__atomic_exchange: |
| 533 | Val1 = EmitScalarExpr(E->getVal1()); |
| 534 | Dest = EmitScalarExpr(E->getVal2()); |
| 535 | break; |
| 536 | |
| 537 | case AtomicExpr::AO__c11_atomic_compare_exchange_strong: |
| 538 | case AtomicExpr::AO__c11_atomic_compare_exchange_weak: |
| 539 | case AtomicExpr::AO__atomic_compare_exchange_n: |
| 540 | case AtomicExpr::AO__atomic_compare_exchange: |
| 541 | Val1 = EmitScalarExpr(E->getVal1()); |
| 542 | if (E->getOp() == AtomicExpr::AO__atomic_compare_exchange) |
| 543 | Val2 = EmitScalarExpr(E->getVal2()); |
| 544 | else |
| 545 | Val2 = EmitValToTemp(*this, E->getVal2()); |
| 546 | OrderFail = EmitScalarExpr(E->getOrderFail()); |
John McCall | fafaaef | 2013-03-07 21:37:12 +0000 | [diff] [blame] | 547 | if (E->getNumSubExprs() == 6) |
Stephen Hines | c568f1e | 2014-07-21 00:47:37 -0700 | [diff] [blame] | 548 | IsWeak = EmitScalarExpr(E->getWeak()); |
John McCall | fafaaef | 2013-03-07 21:37:12 +0000 | [diff] [blame] | 549 | break; |
| 550 | |
| 551 | case AtomicExpr::AO__c11_atomic_fetch_add: |
| 552 | case AtomicExpr::AO__c11_atomic_fetch_sub: |
| 553 | if (MemTy->isPointerType()) { |
| 554 | // For pointer arithmetic, we're required to do a bit of math: |
| 555 | // adding 1 to an int* is not the same as adding 1 to a uintptr_t. |
| 556 | // ... but only for the C11 builtins. The GNU builtins expect the |
| 557 | // user to multiply by sizeof(T). |
| 558 | QualType Val1Ty = E->getVal1()->getType(); |
| 559 | llvm::Value *Val1Scalar = EmitScalarExpr(E->getVal1()); |
| 560 | CharUnits PointeeIncAmt = |
| 561 | getContext().getTypeSizeInChars(MemTy->getPointeeType()); |
| 562 | Val1Scalar = Builder.CreateMul(Val1Scalar, CGM.getSize(PointeeIncAmt)); |
| 563 | Val1 = CreateMemTemp(Val1Ty, ".atomictmp"); |
| 564 | EmitStoreOfScalar(Val1Scalar, MakeAddrLValue(Val1, Val1Ty)); |
| 565 | break; |
| 566 | } |
| 567 | // Fall through. |
| 568 | case AtomicExpr::AO__atomic_fetch_add: |
| 569 | case AtomicExpr::AO__atomic_fetch_sub: |
| 570 | case AtomicExpr::AO__atomic_add_fetch: |
| 571 | case AtomicExpr::AO__atomic_sub_fetch: |
| 572 | case AtomicExpr::AO__c11_atomic_store: |
| 573 | case AtomicExpr::AO__c11_atomic_exchange: |
| 574 | case AtomicExpr::AO__atomic_store_n: |
| 575 | case AtomicExpr::AO__atomic_exchange_n: |
| 576 | case AtomicExpr::AO__c11_atomic_fetch_and: |
| 577 | case AtomicExpr::AO__c11_atomic_fetch_or: |
| 578 | case AtomicExpr::AO__c11_atomic_fetch_xor: |
| 579 | case AtomicExpr::AO__atomic_fetch_and: |
| 580 | case AtomicExpr::AO__atomic_fetch_or: |
| 581 | case AtomicExpr::AO__atomic_fetch_xor: |
| 582 | case AtomicExpr::AO__atomic_fetch_nand: |
| 583 | case AtomicExpr::AO__atomic_and_fetch: |
| 584 | case AtomicExpr::AO__atomic_or_fetch: |
| 585 | case AtomicExpr::AO__atomic_xor_fetch: |
| 586 | case AtomicExpr::AO__atomic_nand_fetch: |
| 587 | Val1 = EmitValToTemp(*this, E->getVal1()); |
| 588 | break; |
| 589 | } |
| 590 | |
| 591 | if (!E->getType()->isVoidType() && !Dest) |
| 592 | Dest = CreateMemTemp(E->getType(), ".atomicdst"); |
| 593 | |
| 594 | // Use a library call. See: http://gcc.gnu.org/wiki/Atomic/GCCMM/LIbrary . |
| 595 | if (UseLibcall) { |
Ed Schouten | e469249 | 2013-05-31 19:27:59 +0000 | [diff] [blame] | 596 | bool UseOptimizedLibcall = false; |
| 597 | switch (E->getOp()) { |
| 598 | case AtomicExpr::AO__c11_atomic_fetch_add: |
| 599 | case AtomicExpr::AO__atomic_fetch_add: |
| 600 | case AtomicExpr::AO__c11_atomic_fetch_and: |
| 601 | case AtomicExpr::AO__atomic_fetch_and: |
| 602 | case AtomicExpr::AO__c11_atomic_fetch_or: |
| 603 | case AtomicExpr::AO__atomic_fetch_or: |
| 604 | case AtomicExpr::AO__c11_atomic_fetch_sub: |
| 605 | case AtomicExpr::AO__atomic_fetch_sub: |
| 606 | case AtomicExpr::AO__c11_atomic_fetch_xor: |
| 607 | case AtomicExpr::AO__atomic_fetch_xor: |
| 608 | // For these, only library calls for certain sizes exist. |
| 609 | UseOptimizedLibcall = true; |
| 610 | break; |
| 611 | default: |
| 612 | // Only use optimized library calls for sizes for which they exist. |
| 613 | if (Size == 1 || Size == 2 || Size == 4 || Size == 8) |
| 614 | UseOptimizedLibcall = true; |
| 615 | break; |
| 616 | } |
John McCall | fafaaef | 2013-03-07 21:37:12 +0000 | [diff] [blame] | 617 | |
John McCall | fafaaef | 2013-03-07 21:37:12 +0000 | [diff] [blame] | 618 | CallArgList Args; |
Ed Schouten | e469249 | 2013-05-31 19:27:59 +0000 | [diff] [blame] | 619 | if (!UseOptimizedLibcall) { |
| 620 | // For non-optimized library calls, the size is the first parameter |
| 621 | Args.add(RValue::get(llvm::ConstantInt::get(SizeTy, Size)), |
| 622 | getContext().getSizeType()); |
| 623 | } |
| 624 | // Atomic address is the first or second parameter |
Nick Lewycky | 5d4a755 | 2013-10-01 21:51:38 +0000 | [diff] [blame] | 625 | Args.add(RValue::get(EmitCastToVoidPtr(Ptr)), getContext().VoidPtrTy); |
John McCall | fafaaef | 2013-03-07 21:37:12 +0000 | [diff] [blame] | 626 | |
Ed Schouten | e469249 | 2013-05-31 19:27:59 +0000 | [diff] [blame] | 627 | std::string LibCallName; |
Stephen Hines | 651f13c | 2014-04-23 16:59:28 -0700 | [diff] [blame] | 628 | QualType LoweredMemTy = |
| 629 | MemTy->isPointerType() ? getContext().getIntPtrType() : MemTy; |
Ed Schouten | e469249 | 2013-05-31 19:27:59 +0000 | [diff] [blame] | 630 | QualType RetTy; |
| 631 | bool HaveRetTy = false; |
John McCall | fafaaef | 2013-03-07 21:37:12 +0000 | [diff] [blame] | 632 | switch (E->getOp()) { |
| 633 | // There is only one libcall for compare an exchange, because there is no |
| 634 | // optimisation benefit possible from a libcall version of a weak compare |
| 635 | // and exchange. |
Ed Schouten | e469249 | 2013-05-31 19:27:59 +0000 | [diff] [blame] | 636 | // bool __atomic_compare_exchange(size_t size, void *mem, void *expected, |
John McCall | fafaaef | 2013-03-07 21:37:12 +0000 | [diff] [blame] | 637 | // void *desired, int success, int failure) |
Ed Schouten | e469249 | 2013-05-31 19:27:59 +0000 | [diff] [blame] | 638 | // bool __atomic_compare_exchange_N(T *mem, T *expected, T desired, |
| 639 | // int success, int failure) |
John McCall | fafaaef | 2013-03-07 21:37:12 +0000 | [diff] [blame] | 640 | case AtomicExpr::AO__c11_atomic_compare_exchange_weak: |
| 641 | case AtomicExpr::AO__c11_atomic_compare_exchange_strong: |
| 642 | case AtomicExpr::AO__atomic_compare_exchange: |
| 643 | case AtomicExpr::AO__atomic_compare_exchange_n: |
| 644 | LibCallName = "__atomic_compare_exchange"; |
| 645 | RetTy = getContext().BoolTy; |
Ed Schouten | e469249 | 2013-05-31 19:27:59 +0000 | [diff] [blame] | 646 | HaveRetTy = true; |
Nick Lewycky | 4ee7dc2 | 2013-10-02 02:29:49 +0000 | [diff] [blame] | 647 | Args.add(RValue::get(EmitCastToVoidPtr(Val1)), getContext().VoidPtrTy); |
| 648 | AddDirectArgument(*this, Args, UseOptimizedLibcall, Val2, MemTy, |
Stephen Hines | 176edba | 2014-12-01 14:53:08 -0800 | [diff] [blame] | 649 | E->getExprLoc(), sizeChars); |
Nick Lewycky | 5d4a755 | 2013-10-01 21:51:38 +0000 | [diff] [blame] | 650 | Args.add(RValue::get(Order), getContext().IntTy); |
John McCall | fafaaef | 2013-03-07 21:37:12 +0000 | [diff] [blame] | 651 | Order = OrderFail; |
| 652 | break; |
| 653 | // void __atomic_exchange(size_t size, void *mem, void *val, void *return, |
| 654 | // int order) |
Ed Schouten | e469249 | 2013-05-31 19:27:59 +0000 | [diff] [blame] | 655 | // T __atomic_exchange_N(T *mem, T val, int order) |
John McCall | fafaaef | 2013-03-07 21:37:12 +0000 | [diff] [blame] | 656 | case AtomicExpr::AO__c11_atomic_exchange: |
| 657 | case AtomicExpr::AO__atomic_exchange_n: |
| 658 | case AtomicExpr::AO__atomic_exchange: |
| 659 | LibCallName = "__atomic_exchange"; |
Nick Lewycky | 4ee7dc2 | 2013-10-02 02:29:49 +0000 | [diff] [blame] | 660 | AddDirectArgument(*this, Args, UseOptimizedLibcall, Val1, MemTy, |
Stephen Hines | 176edba | 2014-12-01 14:53:08 -0800 | [diff] [blame] | 661 | E->getExprLoc(), sizeChars); |
John McCall | fafaaef | 2013-03-07 21:37:12 +0000 | [diff] [blame] | 662 | break; |
| 663 | // void __atomic_store(size_t size, void *mem, void *val, int order) |
Ed Schouten | e469249 | 2013-05-31 19:27:59 +0000 | [diff] [blame] | 664 | // void __atomic_store_N(T *mem, T val, int order) |
John McCall | fafaaef | 2013-03-07 21:37:12 +0000 | [diff] [blame] | 665 | case AtomicExpr::AO__c11_atomic_store: |
| 666 | case AtomicExpr::AO__atomic_store: |
| 667 | case AtomicExpr::AO__atomic_store_n: |
| 668 | LibCallName = "__atomic_store"; |
Ed Schouten | e469249 | 2013-05-31 19:27:59 +0000 | [diff] [blame] | 669 | RetTy = getContext().VoidTy; |
| 670 | HaveRetTy = true; |
Nick Lewycky | 4ee7dc2 | 2013-10-02 02:29:49 +0000 | [diff] [blame] | 671 | AddDirectArgument(*this, Args, UseOptimizedLibcall, Val1, MemTy, |
Stephen Hines | 176edba | 2014-12-01 14:53:08 -0800 | [diff] [blame] | 672 | E->getExprLoc(), sizeChars); |
John McCall | fafaaef | 2013-03-07 21:37:12 +0000 | [diff] [blame] | 673 | break; |
| 674 | // void __atomic_load(size_t size, void *mem, void *return, int order) |
Ed Schouten | e469249 | 2013-05-31 19:27:59 +0000 | [diff] [blame] | 675 | // T __atomic_load_N(T *mem, int order) |
John McCall | fafaaef | 2013-03-07 21:37:12 +0000 | [diff] [blame] | 676 | case AtomicExpr::AO__c11_atomic_load: |
| 677 | case AtomicExpr::AO__atomic_load: |
| 678 | case AtomicExpr::AO__atomic_load_n: |
| 679 | LibCallName = "__atomic_load"; |
Ed Schouten | e469249 | 2013-05-31 19:27:59 +0000 | [diff] [blame] | 680 | break; |
| 681 | // T __atomic_fetch_add_N(T *mem, T val, int order) |
| 682 | case AtomicExpr::AO__c11_atomic_fetch_add: |
| 683 | case AtomicExpr::AO__atomic_fetch_add: |
| 684 | LibCallName = "__atomic_fetch_add"; |
Stephen Hines | 651f13c | 2014-04-23 16:59:28 -0700 | [diff] [blame] | 685 | AddDirectArgument(*this, Args, UseOptimizedLibcall, Val1, LoweredMemTy, |
Stephen Hines | 176edba | 2014-12-01 14:53:08 -0800 | [diff] [blame] | 686 | E->getExprLoc(), sizeChars); |
Ed Schouten | e469249 | 2013-05-31 19:27:59 +0000 | [diff] [blame] | 687 | break; |
| 688 | // T __atomic_fetch_and_N(T *mem, T val, int order) |
| 689 | case AtomicExpr::AO__c11_atomic_fetch_and: |
| 690 | case AtomicExpr::AO__atomic_fetch_and: |
| 691 | LibCallName = "__atomic_fetch_and"; |
Nick Lewycky | 4ee7dc2 | 2013-10-02 02:29:49 +0000 | [diff] [blame] | 692 | AddDirectArgument(*this, Args, UseOptimizedLibcall, Val1, MemTy, |
Stephen Hines | 176edba | 2014-12-01 14:53:08 -0800 | [diff] [blame] | 693 | E->getExprLoc(), sizeChars); |
Ed Schouten | e469249 | 2013-05-31 19:27:59 +0000 | [diff] [blame] | 694 | break; |
| 695 | // T __atomic_fetch_or_N(T *mem, T val, int order) |
| 696 | case AtomicExpr::AO__c11_atomic_fetch_or: |
| 697 | case AtomicExpr::AO__atomic_fetch_or: |
| 698 | LibCallName = "__atomic_fetch_or"; |
Nick Lewycky | 4ee7dc2 | 2013-10-02 02:29:49 +0000 | [diff] [blame] | 699 | AddDirectArgument(*this, Args, UseOptimizedLibcall, Val1, MemTy, |
Stephen Hines | 176edba | 2014-12-01 14:53:08 -0800 | [diff] [blame] | 700 | E->getExprLoc(), sizeChars); |
Ed Schouten | e469249 | 2013-05-31 19:27:59 +0000 | [diff] [blame] | 701 | break; |
| 702 | // T __atomic_fetch_sub_N(T *mem, T val, int order) |
| 703 | case AtomicExpr::AO__c11_atomic_fetch_sub: |
| 704 | case AtomicExpr::AO__atomic_fetch_sub: |
| 705 | LibCallName = "__atomic_fetch_sub"; |
Stephen Hines | 651f13c | 2014-04-23 16:59:28 -0700 | [diff] [blame] | 706 | AddDirectArgument(*this, Args, UseOptimizedLibcall, Val1, LoweredMemTy, |
Stephen Hines | 176edba | 2014-12-01 14:53:08 -0800 | [diff] [blame] | 707 | E->getExprLoc(), sizeChars); |
Ed Schouten | e469249 | 2013-05-31 19:27:59 +0000 | [diff] [blame] | 708 | break; |
| 709 | // T __atomic_fetch_xor_N(T *mem, T val, int order) |
| 710 | case AtomicExpr::AO__c11_atomic_fetch_xor: |
| 711 | case AtomicExpr::AO__atomic_fetch_xor: |
| 712 | LibCallName = "__atomic_fetch_xor"; |
Nick Lewycky | 4ee7dc2 | 2013-10-02 02:29:49 +0000 | [diff] [blame] | 713 | AddDirectArgument(*this, Args, UseOptimizedLibcall, Val1, MemTy, |
Stephen Hines | 176edba | 2014-12-01 14:53:08 -0800 | [diff] [blame] | 714 | E->getExprLoc(), sizeChars); |
John McCall | fafaaef | 2013-03-07 21:37:12 +0000 | [diff] [blame] | 715 | break; |
John McCall | fafaaef | 2013-03-07 21:37:12 +0000 | [diff] [blame] | 716 | default: return EmitUnsupportedRValue(E, "atomic library call"); |
| 717 | } |
Ed Schouten | e469249 | 2013-05-31 19:27:59 +0000 | [diff] [blame] | 718 | |
| 719 | // Optimized functions have the size in their name. |
| 720 | if (UseOptimizedLibcall) |
| 721 | LibCallName += "_" + llvm::utostr(Size); |
| 722 | // By default, assume we return a value of the atomic type. |
| 723 | if (!HaveRetTy) { |
| 724 | if (UseOptimizedLibcall) { |
| 725 | // Value is returned directly. |
Stephen Hines | 176edba | 2014-12-01 14:53:08 -0800 | [diff] [blame] | 726 | // The function returns an appropriately sized integer type. |
| 727 | RetTy = getContext().getIntTypeForBitwidth( |
| 728 | getContext().toBits(sizeChars), /*Signed=*/false); |
Ed Schouten | e469249 | 2013-05-31 19:27:59 +0000 | [diff] [blame] | 729 | } else { |
| 730 | // Value is returned through parameter before the order. |
| 731 | RetTy = getContext().VoidTy; |
| 732 | Args.add(RValue::get(EmitCastToVoidPtr(Dest)), |
| 733 | getContext().VoidPtrTy); |
| 734 | } |
| 735 | } |
John McCall | fafaaef | 2013-03-07 21:37:12 +0000 | [diff] [blame] | 736 | // order is always the last parameter |
| 737 | Args.add(RValue::get(Order), |
| 738 | getContext().IntTy); |
| 739 | |
| 740 | const CGFunctionInfo &FuncInfo = |
| 741 | CGM.getTypes().arrangeFreeFunctionCall(RetTy, Args, |
| 742 | FunctionType::ExtInfo(), RequiredArgs::All); |
| 743 | llvm::FunctionType *FTy = CGM.getTypes().GetFunctionType(FuncInfo); |
| 744 | llvm::Constant *Func = CGM.CreateRuntimeFunction(FTy, LibCallName); |
| 745 | RValue Res = EmitCall(FuncInfo, Func, ReturnValueSlot(), Args); |
Stephen Hines | 176edba | 2014-12-01 14:53:08 -0800 | [diff] [blame] | 746 | if (!RetTy->isVoidType()) { |
| 747 | if (UseOptimizedLibcall) { |
| 748 | if (HaveRetTy) |
| 749 | return Res; |
| 750 | llvm::StoreInst *StoreDest = Builder.CreateStore( |
| 751 | Res.getScalarVal(), |
| 752 | Builder.CreateBitCast(Dest, FTy->getReturnType()->getPointerTo())); |
| 753 | StoreDest->setAlignment(Align); |
| 754 | } |
| 755 | } |
John McCall | fafaaef | 2013-03-07 21:37:12 +0000 | [diff] [blame] | 756 | if (E->getType()->isVoidType()) |
Stephen Hines | 6bcf27b | 2014-05-29 04:14:42 -0700 | [diff] [blame] | 757 | return RValue::get(nullptr); |
Nick Lewycky | 4ee7dc2 | 2013-10-02 02:29:49 +0000 | [diff] [blame] | 758 | return convertTempToRValue(Dest, E->getType(), E->getExprLoc()); |
John McCall | fafaaef | 2013-03-07 21:37:12 +0000 | [diff] [blame] | 759 | } |
| 760 | |
| 761 | bool IsStore = E->getOp() == AtomicExpr::AO__c11_atomic_store || |
| 762 | E->getOp() == AtomicExpr::AO__atomic_store || |
| 763 | E->getOp() == AtomicExpr::AO__atomic_store_n; |
| 764 | bool IsLoad = E->getOp() == AtomicExpr::AO__c11_atomic_load || |
| 765 | E->getOp() == AtomicExpr::AO__atomic_load || |
| 766 | E->getOp() == AtomicExpr::AO__atomic_load_n; |
| 767 | |
| 768 | llvm::Type *IPtrTy = |
| 769 | llvm::IntegerType::get(getLLVMContext(), Size * 8)->getPointerTo(); |
| 770 | llvm::Value *OrigDest = Dest; |
| 771 | Ptr = Builder.CreateBitCast(Ptr, IPtrTy); |
| 772 | if (Val1) Val1 = Builder.CreateBitCast(Val1, IPtrTy); |
| 773 | if (Val2) Val2 = Builder.CreateBitCast(Val2, IPtrTy); |
| 774 | if (Dest && !E->isCmpXChg()) Dest = Builder.CreateBitCast(Dest, IPtrTy); |
| 775 | |
| 776 | if (isa<llvm::ConstantInt>(Order)) { |
| 777 | int ord = cast<llvm::ConstantInt>(Order)->getZExtValue(); |
| 778 | switch (ord) { |
Stephen Hines | 651f13c | 2014-04-23 16:59:28 -0700 | [diff] [blame] | 779 | case AtomicExpr::AO_ABI_memory_order_relaxed: |
Stephen Hines | c568f1e | 2014-07-21 00:47:37 -0700 | [diff] [blame] | 780 | EmitAtomicOp(*this, E, Dest, Ptr, Val1, Val2, IsWeak, OrderFail, |
Stephen Hines | 651f13c | 2014-04-23 16:59:28 -0700 | [diff] [blame] | 781 | Size, Align, llvm::Monotonic); |
John McCall | fafaaef | 2013-03-07 21:37:12 +0000 | [diff] [blame] | 782 | break; |
Stephen Hines | 651f13c | 2014-04-23 16:59:28 -0700 | [diff] [blame] | 783 | case AtomicExpr::AO_ABI_memory_order_consume: |
| 784 | case AtomicExpr::AO_ABI_memory_order_acquire: |
John McCall | fafaaef | 2013-03-07 21:37:12 +0000 | [diff] [blame] | 785 | if (IsStore) |
| 786 | break; // Avoid crashing on code with undefined behavior |
Stephen Hines | c568f1e | 2014-07-21 00:47:37 -0700 | [diff] [blame] | 787 | EmitAtomicOp(*this, E, Dest, Ptr, Val1, Val2, IsWeak, OrderFail, |
Stephen Hines | 651f13c | 2014-04-23 16:59:28 -0700 | [diff] [blame] | 788 | Size, Align, llvm::Acquire); |
John McCall | fafaaef | 2013-03-07 21:37:12 +0000 | [diff] [blame] | 789 | break; |
Stephen Hines | 651f13c | 2014-04-23 16:59:28 -0700 | [diff] [blame] | 790 | case AtomicExpr::AO_ABI_memory_order_release: |
John McCall | fafaaef | 2013-03-07 21:37:12 +0000 | [diff] [blame] | 791 | if (IsLoad) |
| 792 | break; // Avoid crashing on code with undefined behavior |
Stephen Hines | c568f1e | 2014-07-21 00:47:37 -0700 | [diff] [blame] | 793 | EmitAtomicOp(*this, E, Dest, Ptr, Val1, Val2, IsWeak, OrderFail, |
Stephen Hines | 651f13c | 2014-04-23 16:59:28 -0700 | [diff] [blame] | 794 | Size, Align, llvm::Release); |
John McCall | fafaaef | 2013-03-07 21:37:12 +0000 | [diff] [blame] | 795 | break; |
Stephen Hines | 651f13c | 2014-04-23 16:59:28 -0700 | [diff] [blame] | 796 | case AtomicExpr::AO_ABI_memory_order_acq_rel: |
John McCall | fafaaef | 2013-03-07 21:37:12 +0000 | [diff] [blame] | 797 | if (IsLoad || IsStore) |
| 798 | break; // Avoid crashing on code with undefined behavior |
Stephen Hines | c568f1e | 2014-07-21 00:47:37 -0700 | [diff] [blame] | 799 | EmitAtomicOp(*this, E, Dest, Ptr, Val1, Val2, IsWeak, OrderFail, |
Stephen Hines | 651f13c | 2014-04-23 16:59:28 -0700 | [diff] [blame] | 800 | Size, Align, llvm::AcquireRelease); |
John McCall | fafaaef | 2013-03-07 21:37:12 +0000 | [diff] [blame] | 801 | break; |
Stephen Hines | 651f13c | 2014-04-23 16:59:28 -0700 | [diff] [blame] | 802 | case AtomicExpr::AO_ABI_memory_order_seq_cst: |
Stephen Hines | c568f1e | 2014-07-21 00:47:37 -0700 | [diff] [blame] | 803 | EmitAtomicOp(*this, E, Dest, Ptr, Val1, Val2, IsWeak, OrderFail, |
Stephen Hines | 651f13c | 2014-04-23 16:59:28 -0700 | [diff] [blame] | 804 | Size, Align, llvm::SequentiallyConsistent); |
John McCall | fafaaef | 2013-03-07 21:37:12 +0000 | [diff] [blame] | 805 | break; |
| 806 | default: // invalid order |
| 807 | // We should not ever get here normally, but it's hard to |
| 808 | // enforce that in general. |
| 809 | break; |
| 810 | } |
| 811 | if (E->getType()->isVoidType()) |
Stephen Hines | 6bcf27b | 2014-05-29 04:14:42 -0700 | [diff] [blame] | 812 | return RValue::get(nullptr); |
Nick Lewycky | 4ee7dc2 | 2013-10-02 02:29:49 +0000 | [diff] [blame] | 813 | return convertTempToRValue(OrigDest, E->getType(), E->getExprLoc()); |
John McCall | fafaaef | 2013-03-07 21:37:12 +0000 | [diff] [blame] | 814 | } |
| 815 | |
| 816 | // Long case, when Order isn't obviously constant. |
| 817 | |
| 818 | // Create all the relevant BB's |
Stephen Hines | 6bcf27b | 2014-05-29 04:14:42 -0700 | [diff] [blame] | 819 | llvm::BasicBlock *MonotonicBB = nullptr, *AcquireBB = nullptr, |
| 820 | *ReleaseBB = nullptr, *AcqRelBB = nullptr, |
| 821 | *SeqCstBB = nullptr; |
John McCall | fafaaef | 2013-03-07 21:37:12 +0000 | [diff] [blame] | 822 | MonotonicBB = createBasicBlock("monotonic", CurFn); |
| 823 | if (!IsStore) |
| 824 | AcquireBB = createBasicBlock("acquire", CurFn); |
| 825 | if (!IsLoad) |
| 826 | ReleaseBB = createBasicBlock("release", CurFn); |
| 827 | if (!IsLoad && !IsStore) |
| 828 | AcqRelBB = createBasicBlock("acqrel", CurFn); |
| 829 | SeqCstBB = createBasicBlock("seqcst", CurFn); |
| 830 | llvm::BasicBlock *ContBB = createBasicBlock("atomic.continue", CurFn); |
| 831 | |
| 832 | // Create the switch for the split |
| 833 | // MonotonicBB is arbitrarily chosen as the default case; in practice, this |
| 834 | // doesn't matter unless someone is crazy enough to use something that |
| 835 | // doesn't fold to a constant for the ordering. |
| 836 | Order = Builder.CreateIntCast(Order, Builder.getInt32Ty(), false); |
| 837 | llvm::SwitchInst *SI = Builder.CreateSwitch(Order, MonotonicBB); |
| 838 | |
| 839 | // Emit all the different atomics |
| 840 | Builder.SetInsertPoint(MonotonicBB); |
Stephen Hines | c568f1e | 2014-07-21 00:47:37 -0700 | [diff] [blame] | 841 | EmitAtomicOp(*this, E, Dest, Ptr, Val1, Val2, IsWeak, OrderFail, |
Stephen Hines | 651f13c | 2014-04-23 16:59:28 -0700 | [diff] [blame] | 842 | Size, Align, llvm::Monotonic); |
John McCall | fafaaef | 2013-03-07 21:37:12 +0000 | [diff] [blame] | 843 | Builder.CreateBr(ContBB); |
| 844 | if (!IsStore) { |
| 845 | Builder.SetInsertPoint(AcquireBB); |
Stephen Hines | c568f1e | 2014-07-21 00:47:37 -0700 | [diff] [blame] | 846 | EmitAtomicOp(*this, E, Dest, Ptr, Val1, Val2, IsWeak, OrderFail, |
Stephen Hines | 651f13c | 2014-04-23 16:59:28 -0700 | [diff] [blame] | 847 | Size, Align, llvm::Acquire); |
John McCall | fafaaef | 2013-03-07 21:37:12 +0000 | [diff] [blame] | 848 | Builder.CreateBr(ContBB); |
Stephen Hines | 651f13c | 2014-04-23 16:59:28 -0700 | [diff] [blame] | 849 | SI->addCase(Builder.getInt32(AtomicExpr::AO_ABI_memory_order_consume), |
| 850 | AcquireBB); |
| 851 | SI->addCase(Builder.getInt32(AtomicExpr::AO_ABI_memory_order_acquire), |
| 852 | AcquireBB); |
John McCall | fafaaef | 2013-03-07 21:37:12 +0000 | [diff] [blame] | 853 | } |
| 854 | if (!IsLoad) { |
| 855 | Builder.SetInsertPoint(ReleaseBB); |
Stephen Hines | c568f1e | 2014-07-21 00:47:37 -0700 | [diff] [blame] | 856 | EmitAtomicOp(*this, E, Dest, Ptr, Val1, Val2, IsWeak, OrderFail, |
Stephen Hines | 651f13c | 2014-04-23 16:59:28 -0700 | [diff] [blame] | 857 | Size, Align, llvm::Release); |
John McCall | fafaaef | 2013-03-07 21:37:12 +0000 | [diff] [blame] | 858 | Builder.CreateBr(ContBB); |
Stephen Hines | 651f13c | 2014-04-23 16:59:28 -0700 | [diff] [blame] | 859 | SI->addCase(Builder.getInt32(AtomicExpr::AO_ABI_memory_order_release), |
| 860 | ReleaseBB); |
John McCall | fafaaef | 2013-03-07 21:37:12 +0000 | [diff] [blame] | 861 | } |
| 862 | if (!IsLoad && !IsStore) { |
| 863 | Builder.SetInsertPoint(AcqRelBB); |
Stephen Hines | c568f1e | 2014-07-21 00:47:37 -0700 | [diff] [blame] | 864 | EmitAtomicOp(*this, E, Dest, Ptr, Val1, Val2, IsWeak, OrderFail, |
Stephen Hines | 651f13c | 2014-04-23 16:59:28 -0700 | [diff] [blame] | 865 | Size, Align, llvm::AcquireRelease); |
John McCall | fafaaef | 2013-03-07 21:37:12 +0000 | [diff] [blame] | 866 | Builder.CreateBr(ContBB); |
Stephen Hines | 651f13c | 2014-04-23 16:59:28 -0700 | [diff] [blame] | 867 | SI->addCase(Builder.getInt32(AtomicExpr::AO_ABI_memory_order_acq_rel), |
| 868 | AcqRelBB); |
John McCall | fafaaef | 2013-03-07 21:37:12 +0000 | [diff] [blame] | 869 | } |
| 870 | Builder.SetInsertPoint(SeqCstBB); |
Stephen Hines | c568f1e | 2014-07-21 00:47:37 -0700 | [diff] [blame] | 871 | EmitAtomicOp(*this, E, Dest, Ptr, Val1, Val2, IsWeak, OrderFail, |
Stephen Hines | 651f13c | 2014-04-23 16:59:28 -0700 | [diff] [blame] | 872 | Size, Align, llvm::SequentiallyConsistent); |
John McCall | fafaaef | 2013-03-07 21:37:12 +0000 | [diff] [blame] | 873 | Builder.CreateBr(ContBB); |
Stephen Hines | 651f13c | 2014-04-23 16:59:28 -0700 | [diff] [blame] | 874 | SI->addCase(Builder.getInt32(AtomicExpr::AO_ABI_memory_order_seq_cst), |
| 875 | SeqCstBB); |
John McCall | fafaaef | 2013-03-07 21:37:12 +0000 | [diff] [blame] | 876 | |
| 877 | // Cleanup and return |
| 878 | Builder.SetInsertPoint(ContBB); |
| 879 | if (E->getType()->isVoidType()) |
Stephen Hines | 6bcf27b | 2014-05-29 04:14:42 -0700 | [diff] [blame] | 880 | return RValue::get(nullptr); |
Nick Lewycky | 4ee7dc2 | 2013-10-02 02:29:49 +0000 | [diff] [blame] | 881 | return convertTempToRValue(OrigDest, E->getType(), E->getExprLoc()); |
John McCall | fafaaef | 2013-03-07 21:37:12 +0000 | [diff] [blame] | 882 | } |
John McCall | 9eda3ab | 2013-03-07 21:37:17 +0000 | [diff] [blame] | 883 | |
| 884 | llvm::Value *AtomicInfo::emitCastToAtomicIntPointer(llvm::Value *addr) const { |
| 885 | unsigned addrspace = |
| 886 | cast<llvm::PointerType>(addr->getType())->getAddressSpace(); |
| 887 | llvm::IntegerType *ty = |
| 888 | llvm::IntegerType::get(CGF.getLLVMContext(), AtomicSizeInBits); |
| 889 | return CGF.Builder.CreateBitCast(addr, ty->getPointerTo(addrspace)); |
| 890 | } |
| 891 | |
| 892 | RValue AtomicInfo::convertTempToRValue(llvm::Value *addr, |
Nick Lewycky | 4ee7dc2 | 2013-10-02 02:29:49 +0000 | [diff] [blame] | 893 | AggValueSlot resultSlot, |
| 894 | SourceLocation loc) const { |
Eli Friedman | 336d9df | 2013-07-11 01:32:21 +0000 | [diff] [blame] | 895 | if (EvaluationKind == TEK_Aggregate) |
| 896 | return resultSlot.asRValue(); |
John McCall | 9eda3ab | 2013-03-07 21:37:17 +0000 | [diff] [blame] | 897 | |
| 898 | // Drill into the padding structure if we have one. |
| 899 | if (hasPadding()) |
| 900 | addr = CGF.Builder.CreateStructGEP(addr, 0); |
| 901 | |
John McCall | 9eda3ab | 2013-03-07 21:37:17 +0000 | [diff] [blame] | 902 | // Otherwise, just convert the temporary to an r-value using the |
| 903 | // normal conversion routine. |
Nick Lewycky | 4ee7dc2 | 2013-10-02 02:29:49 +0000 | [diff] [blame] | 904 | return CGF.convertTempToRValue(addr, getValueType(), loc); |
John McCall | 9eda3ab | 2013-03-07 21:37:17 +0000 | [diff] [blame] | 905 | } |
| 906 | |
| 907 | /// Emit a load from an l-value of atomic type. Note that the r-value |
| 908 | /// we produce is an r-value of the atomic *value* type. |
Nick Lewycky | 4ee7dc2 | 2013-10-02 02:29:49 +0000 | [diff] [blame] | 909 | RValue CodeGenFunction::EmitAtomicLoad(LValue src, SourceLocation loc, |
| 910 | AggValueSlot resultSlot) { |
John McCall | 9eda3ab | 2013-03-07 21:37:17 +0000 | [diff] [blame] | 911 | AtomicInfo atomics(*this, src); |
| 912 | |
| 913 | // Check whether we should use a library call. |
| 914 | if (atomics.shouldUseLibcall()) { |
| 915 | llvm::Value *tempAddr; |
Eli Friedman | 336d9df | 2013-07-11 01:32:21 +0000 | [diff] [blame] | 916 | if (!resultSlot.isIgnored()) { |
John McCall | 9eda3ab | 2013-03-07 21:37:17 +0000 | [diff] [blame] | 917 | assert(atomics.getEvaluationKind() == TEK_Aggregate); |
| 918 | tempAddr = resultSlot.getAddr(); |
| 919 | } else { |
| 920 | tempAddr = CreateMemTemp(atomics.getAtomicType(), "atomic-load-temp"); |
| 921 | } |
| 922 | |
| 923 | // void __atomic_load(size_t size, void *mem, void *return, int order); |
| 924 | CallArgList args; |
| 925 | args.add(RValue::get(atomics.getAtomicSizeValue()), |
| 926 | getContext().getSizeType()); |
| 927 | args.add(RValue::get(EmitCastToVoidPtr(src.getAddress())), |
| 928 | getContext().VoidPtrTy); |
| 929 | args.add(RValue::get(EmitCastToVoidPtr(tempAddr)), |
| 930 | getContext().VoidPtrTy); |
Stephen Hines | 651f13c | 2014-04-23 16:59:28 -0700 | [diff] [blame] | 931 | args.add(RValue::get(llvm::ConstantInt::get( |
| 932 | IntTy, AtomicExpr::AO_ABI_memory_order_seq_cst)), |
John McCall | 9eda3ab | 2013-03-07 21:37:17 +0000 | [diff] [blame] | 933 | getContext().IntTy); |
| 934 | emitAtomicLibcall(*this, "__atomic_load", getContext().VoidTy, args); |
| 935 | |
| 936 | // Produce the r-value. |
Nick Lewycky | 4ee7dc2 | 2013-10-02 02:29:49 +0000 | [diff] [blame] | 937 | return atomics.convertTempToRValue(tempAddr, resultSlot, loc); |
John McCall | 9eda3ab | 2013-03-07 21:37:17 +0000 | [diff] [blame] | 938 | } |
| 939 | |
| 940 | // Okay, we're doing this natively. |
| 941 | llvm::Value *addr = atomics.emitCastToAtomicIntPointer(src.getAddress()); |
| 942 | llvm::LoadInst *load = Builder.CreateLoad(addr, "atomic-load"); |
| 943 | load->setAtomic(llvm::SequentiallyConsistent); |
| 944 | |
| 945 | // Other decoration. |
| 946 | load->setAlignment(src.getAlignment().getQuantity()); |
| 947 | if (src.isVolatileQualified()) |
| 948 | load->setVolatile(true); |
| 949 | if (src.getTBAAInfo()) |
| 950 | CGM.DecorateInstruction(load, src.getTBAAInfo()); |
| 951 | |
| 952 | // Okay, turn that back into the original value type. |
| 953 | QualType valueType = atomics.getValueType(); |
| 954 | llvm::Value *result = load; |
| 955 | |
| 956 | // If we're ignoring an aggregate return, don't do anything. |
| 957 | if (atomics.getEvaluationKind() == TEK_Aggregate && resultSlot.isIgnored()) |
Stephen Hines | 6bcf27b | 2014-05-29 04:14:42 -0700 | [diff] [blame] | 958 | return RValue::getAggregate(nullptr, false); |
John McCall | 9eda3ab | 2013-03-07 21:37:17 +0000 | [diff] [blame] | 959 | |
| 960 | // The easiest way to do this this is to go through memory, but we |
| 961 | // try not to in some easy cases. |
| 962 | if (atomics.getEvaluationKind() == TEK_Scalar && !atomics.hasPadding()) { |
| 963 | llvm::Type *resultTy = CGM.getTypes().ConvertTypeForMem(valueType); |
| 964 | if (isa<llvm::IntegerType>(resultTy)) { |
| 965 | assert(result->getType() == resultTy); |
| 966 | result = EmitFromMemory(result, valueType); |
| 967 | } else if (isa<llvm::PointerType>(resultTy)) { |
| 968 | result = Builder.CreateIntToPtr(result, resultTy); |
| 969 | } else { |
| 970 | result = Builder.CreateBitCast(result, resultTy); |
| 971 | } |
| 972 | return RValue::get(result); |
| 973 | } |
| 974 | |
| 975 | // Create a temporary. This needs to be big enough to hold the |
| 976 | // atomic integer. |
| 977 | llvm::Value *temp; |
| 978 | bool tempIsVolatile = false; |
| 979 | CharUnits tempAlignment; |
Eli Friedman | 336d9df | 2013-07-11 01:32:21 +0000 | [diff] [blame] | 980 | if (atomics.getEvaluationKind() == TEK_Aggregate) { |
John McCall | 9eda3ab | 2013-03-07 21:37:17 +0000 | [diff] [blame] | 981 | assert(!resultSlot.isIgnored()); |
Eli Friedman | 336d9df | 2013-07-11 01:32:21 +0000 | [diff] [blame] | 982 | temp = resultSlot.getAddr(); |
| 983 | tempAlignment = atomics.getValueAlignment(); |
John McCall | 9eda3ab | 2013-03-07 21:37:17 +0000 | [diff] [blame] | 984 | tempIsVolatile = resultSlot.isVolatile(); |
| 985 | } else { |
| 986 | temp = CreateMemTemp(atomics.getAtomicType(), "atomic-load-temp"); |
| 987 | tempAlignment = atomics.getAtomicAlignment(); |
| 988 | } |
| 989 | |
| 990 | // Slam the integer into the temporary. |
| 991 | llvm::Value *castTemp = atomics.emitCastToAtomicIntPointer(temp); |
| 992 | Builder.CreateAlignedStore(result, castTemp, tempAlignment.getQuantity()) |
| 993 | ->setVolatile(tempIsVolatile); |
| 994 | |
Nick Lewycky | 4ee7dc2 | 2013-10-02 02:29:49 +0000 | [diff] [blame] | 995 | return atomics.convertTempToRValue(temp, resultSlot, loc); |
John McCall | 9eda3ab | 2013-03-07 21:37:17 +0000 | [diff] [blame] | 996 | } |
| 997 | |
| 998 | |
| 999 | |
| 1000 | /// Copy an r-value into memory as part of storing to an atomic type. |
| 1001 | /// This needs to create a bit-pattern suitable for atomic operations. |
| 1002 | void AtomicInfo::emitCopyIntoMemory(RValue rvalue, LValue dest) const { |
| 1003 | // If we have an r-value, the rvalue should be of the atomic type, |
| 1004 | // which means that the caller is responsible for having zeroed |
| 1005 | // any padding. Just do an aggregate copy of that type. |
| 1006 | if (rvalue.isAggregate()) { |
| 1007 | CGF.EmitAggregateCopy(dest.getAddress(), |
| 1008 | rvalue.getAggregateAddr(), |
| 1009 | getAtomicType(), |
| 1010 | (rvalue.isVolatileQualified() |
| 1011 | || dest.isVolatileQualified()), |
| 1012 | dest.getAlignment()); |
| 1013 | return; |
| 1014 | } |
| 1015 | |
| 1016 | // Okay, otherwise we're copying stuff. |
| 1017 | |
| 1018 | // Zero out the buffer if necessary. |
| 1019 | emitMemSetZeroIfNecessary(dest); |
| 1020 | |
| 1021 | // Drill past the padding if present. |
| 1022 | dest = projectValue(dest); |
| 1023 | |
| 1024 | // Okay, store the rvalue in. |
| 1025 | if (rvalue.isScalar()) { |
| 1026 | CGF.EmitStoreOfScalar(rvalue.getScalarVal(), dest, /*init*/ true); |
| 1027 | } else { |
| 1028 | CGF.EmitStoreOfComplex(rvalue.getComplexVal(), dest, /*init*/ true); |
| 1029 | } |
| 1030 | } |
| 1031 | |
| 1032 | |
| 1033 | /// Materialize an r-value into memory for the purposes of storing it |
| 1034 | /// to an atomic type. |
| 1035 | llvm::Value *AtomicInfo::materializeRValue(RValue rvalue) const { |
| 1036 | // Aggregate r-values are already in memory, and EmitAtomicStore |
| 1037 | // requires them to be values of the atomic type. |
| 1038 | if (rvalue.isAggregate()) |
| 1039 | return rvalue.getAggregateAddr(); |
| 1040 | |
| 1041 | // Otherwise, make a temporary and materialize into it. |
| 1042 | llvm::Value *temp = CGF.CreateMemTemp(getAtomicType(), "atomic-store-temp"); |
| 1043 | LValue tempLV = CGF.MakeAddrLValue(temp, getAtomicType(), getAtomicAlignment()); |
| 1044 | emitCopyIntoMemory(rvalue, tempLV); |
| 1045 | return temp; |
| 1046 | } |
| 1047 | |
| 1048 | /// Emit a store to an l-value of atomic type. |
| 1049 | /// |
| 1050 | /// Note that the r-value is expected to be an r-value *of the atomic |
| 1051 | /// type*; this means that for aggregate r-values, it should include |
| 1052 | /// storage for any padding that was necessary. |
Nick Lewycky | 5d4a755 | 2013-10-01 21:51:38 +0000 | [diff] [blame] | 1053 | void CodeGenFunction::EmitAtomicStore(RValue rvalue, LValue dest, bool isInit) { |
John McCall | 9eda3ab | 2013-03-07 21:37:17 +0000 | [diff] [blame] | 1054 | // If this is an aggregate r-value, it should agree in type except |
| 1055 | // maybe for address-space qualification. |
| 1056 | assert(!rvalue.isAggregate() || |
| 1057 | rvalue.getAggregateAddr()->getType()->getPointerElementType() |
| 1058 | == dest.getAddress()->getType()->getPointerElementType()); |
| 1059 | |
| 1060 | AtomicInfo atomics(*this, dest); |
| 1061 | |
| 1062 | // If this is an initialization, just put the value there normally. |
| 1063 | if (isInit) { |
| 1064 | atomics.emitCopyIntoMemory(rvalue, dest); |
| 1065 | return; |
| 1066 | } |
| 1067 | |
| 1068 | // Check whether we should use a library call. |
| 1069 | if (atomics.shouldUseLibcall()) { |
| 1070 | // Produce a source address. |
| 1071 | llvm::Value *srcAddr = atomics.materializeRValue(rvalue); |
| 1072 | |
| 1073 | // void __atomic_store(size_t size, void *mem, void *val, int order) |
| 1074 | CallArgList args; |
| 1075 | args.add(RValue::get(atomics.getAtomicSizeValue()), |
| 1076 | getContext().getSizeType()); |
| 1077 | args.add(RValue::get(EmitCastToVoidPtr(dest.getAddress())), |
| 1078 | getContext().VoidPtrTy); |
| 1079 | args.add(RValue::get(EmitCastToVoidPtr(srcAddr)), |
| 1080 | getContext().VoidPtrTy); |
Stephen Hines | 651f13c | 2014-04-23 16:59:28 -0700 | [diff] [blame] | 1081 | args.add(RValue::get(llvm::ConstantInt::get( |
| 1082 | IntTy, AtomicExpr::AO_ABI_memory_order_seq_cst)), |
John McCall | 9eda3ab | 2013-03-07 21:37:17 +0000 | [diff] [blame] | 1083 | getContext().IntTy); |
| 1084 | emitAtomicLibcall(*this, "__atomic_store", getContext().VoidTy, args); |
| 1085 | return; |
| 1086 | } |
| 1087 | |
| 1088 | // Okay, we're doing this natively. |
| 1089 | llvm::Value *intValue; |
| 1090 | |
| 1091 | // If we've got a scalar value of the right size, try to avoid going |
| 1092 | // through memory. |
| 1093 | if (rvalue.isScalar() && !atomics.hasPadding()) { |
| 1094 | llvm::Value *value = rvalue.getScalarVal(); |
| 1095 | if (isa<llvm::IntegerType>(value->getType())) { |
| 1096 | intValue = value; |
| 1097 | } else { |
| 1098 | llvm::IntegerType *inputIntTy = |
| 1099 | llvm::IntegerType::get(getLLVMContext(), atomics.getValueSizeInBits()); |
| 1100 | if (isa<llvm::PointerType>(value->getType())) { |
| 1101 | intValue = Builder.CreatePtrToInt(value, inputIntTy); |
| 1102 | } else { |
| 1103 | intValue = Builder.CreateBitCast(value, inputIntTy); |
| 1104 | } |
| 1105 | } |
| 1106 | |
| 1107 | // Otherwise, we need to go through memory. |
| 1108 | } else { |
| 1109 | // Put the r-value in memory. |
| 1110 | llvm::Value *addr = atomics.materializeRValue(rvalue); |
| 1111 | |
| 1112 | // Cast the temporary to the atomic int type and pull a value out. |
| 1113 | addr = atomics.emitCastToAtomicIntPointer(addr); |
| 1114 | intValue = Builder.CreateAlignedLoad(addr, |
| 1115 | atomics.getAtomicAlignment().getQuantity()); |
| 1116 | } |
| 1117 | |
| 1118 | // Do the atomic store. |
| 1119 | llvm::Value *addr = atomics.emitCastToAtomicIntPointer(dest.getAddress()); |
| 1120 | llvm::StoreInst *store = Builder.CreateStore(intValue, addr); |
| 1121 | |
| 1122 | // Initializations don't need to be atomic. |
| 1123 | if (!isInit) store->setAtomic(llvm::SequentiallyConsistent); |
| 1124 | |
| 1125 | // Other decoration. |
| 1126 | store->setAlignment(dest.getAlignment().getQuantity()); |
| 1127 | if (dest.isVolatileQualified()) |
| 1128 | store->setVolatile(true); |
| 1129 | if (dest.getTBAAInfo()) |
| 1130 | CGM.DecorateInstruction(store, dest.getTBAAInfo()); |
| 1131 | } |
| 1132 | |
| 1133 | void CodeGenFunction::EmitAtomicInit(Expr *init, LValue dest) { |
| 1134 | AtomicInfo atomics(*this, dest); |
| 1135 | |
| 1136 | switch (atomics.getEvaluationKind()) { |
| 1137 | case TEK_Scalar: { |
| 1138 | llvm::Value *value = EmitScalarExpr(init); |
| 1139 | atomics.emitCopyIntoMemory(RValue::get(value), dest); |
| 1140 | return; |
| 1141 | } |
| 1142 | |
| 1143 | case TEK_Complex: { |
| 1144 | ComplexPairTy value = EmitComplexExpr(init); |
| 1145 | atomics.emitCopyIntoMemory(RValue::getComplex(value), dest); |
| 1146 | return; |
| 1147 | } |
| 1148 | |
| 1149 | case TEK_Aggregate: { |
Eli Friedman | 336d9df | 2013-07-11 01:32:21 +0000 | [diff] [blame] | 1150 | // Fix up the destination if the initializer isn't an expression |
| 1151 | // of atomic type. |
| 1152 | bool Zeroed = false; |
John McCall | 9eda3ab | 2013-03-07 21:37:17 +0000 | [diff] [blame] | 1153 | if (!init->getType()->isAtomicType()) { |
Eli Friedman | 336d9df | 2013-07-11 01:32:21 +0000 | [diff] [blame] | 1154 | Zeroed = atomics.emitMemSetZeroIfNecessary(dest); |
John McCall | 9eda3ab | 2013-03-07 21:37:17 +0000 | [diff] [blame] | 1155 | dest = atomics.projectValue(dest); |
| 1156 | } |
| 1157 | |
| 1158 | // Evaluate the expression directly into the destination. |
| 1159 | AggValueSlot slot = AggValueSlot::forLValue(dest, |
| 1160 | AggValueSlot::IsNotDestructed, |
| 1161 | AggValueSlot::DoesNotNeedGCBarriers, |
Eli Friedman | 336d9df | 2013-07-11 01:32:21 +0000 | [diff] [blame] | 1162 | AggValueSlot::IsNotAliased, |
| 1163 | Zeroed ? AggValueSlot::IsZeroed : |
| 1164 | AggValueSlot::IsNotZeroed); |
| 1165 | |
John McCall | 9eda3ab | 2013-03-07 21:37:17 +0000 | [diff] [blame] | 1166 | EmitAggExpr(init, slot); |
| 1167 | return; |
| 1168 | } |
| 1169 | } |
| 1170 | llvm_unreachable("bad evaluation kind"); |
| 1171 | } |