Chris Lattner | bed3144 | 2007-05-28 01:07:47 +0000 | [diff] [blame] | 1 | //===--- CodeGenFunction.cpp - Emit LLVM Code from ASTs for a Function ----===// |
| 2 | // |
Chandler Carruth | 2946cd7 | 2019-01-19 08:50:56 +0000 | [diff] [blame] | 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 |
Chris Lattner | bed3144 | 2007-05-28 01:07:47 +0000 | [diff] [blame] | 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | // |
| 9 | // This coordinates the per-function state used while generating code. |
| 10 | // |
| 11 | //===----------------------------------------------------------------------===// |
| 12 | |
| 13 | #include "CodeGenFunction.h" |
John McCall | 7f416cc | 2015-09-08 08:05:57 +0000 | [diff] [blame] | 14 | #include "CGBlocks.h" |
Saleem Abdulrasool | 10a4972 | 2016-04-08 16:52:00 +0000 | [diff] [blame] | 15 | #include "CGCleanup.h" |
Peter Collingbourne | fa4d603 | 2011-10-06 18:51:56 +0000 | [diff] [blame] | 16 | #include "CGCUDARuntime.h" |
John McCall | 5d865c32 | 2010-08-31 07:33:07 +0000 | [diff] [blame] | 17 | #include "CGCXXABI.h" |
Eli Friedman | 1763075 | 2008-05-22 01:40:10 +0000 | [diff] [blame] | 18 | #include "CGDebugInfo.h" |
Alexey Bataev | 9959db5 | 2014-05-06 10:08:46 +0000 | [diff] [blame] | 19 | #include "CGOpenMPRuntime.h" |
Chandler Carruth | 3a02247 | 2012-12-04 09:13:33 +0000 | [diff] [blame] | 20 | #include "CodeGenModule.h" |
Justin Bogner | ef512b9 | 2014-01-06 22:27:43 +0000 | [diff] [blame] | 21 | #include "CodeGenPGO.h" |
Peter Collingbourne | b453cd6 | 2013-10-20 21:29:19 +0000 | [diff] [blame] | 22 | #include "TargetInfo.h" |
Daniel Dunbar | ad319a7 | 2008-08-11 05:00:27 +0000 | [diff] [blame] | 23 | #include "clang/AST/ASTContext.h" |
Richard Smith | 376c28e | 2017-08-24 20:10:33 +0000 | [diff] [blame] | 24 | #include "clang/AST/ASTLambda.h" |
Daniel Dunbar | 6e8aa53 | 2008-08-11 05:35:13 +0000 | [diff] [blame] | 25 | #include "clang/AST/Decl.h" |
Anders Carlsson | 468fa63 | 2009-04-04 20:47:02 +0000 | [diff] [blame] | 26 | #include "clang/AST/DeclCXX.h" |
Mike Stump | bee78dd | 2009-12-04 23:26:17 +0000 | [diff] [blame] | 27 | #include "clang/AST/StmtCXX.h" |
Richard Smith | d8e3ac3 | 2016-09-16 23:30:39 +0000 | [diff] [blame] | 28 | #include "clang/AST/StmtObjC.h" |
Sanjay Patel | a24296b | 2015-09-02 20:01:30 +0000 | [diff] [blame] | 29 | #include "clang/Basic/Builtins.h" |
Richard Trieu | 6368818 | 2018-12-11 03:18:39 +0000 | [diff] [blame] | 30 | #include "clang/Basic/CodeGenOptions.h" |
Chandler Carruth | 3a02247 | 2012-12-04 09:13:33 +0000 | [diff] [blame] | 31 | #include "clang/Basic/TargetInfo.h" |
Mark Lacey | a8e7df3 | 2013-10-30 21:53:58 +0000 | [diff] [blame] | 32 | #include "clang/CodeGen/CGFunctionInfo.h" |
Richard Trieu | 5337c74 | 2018-12-06 06:12:20 +0000 | [diff] [blame] | 33 | #include "clang/Frontend/FrontendDiagnostic.h" |
Chandler Carruth | ffd5551 | 2013-01-02 11:45:17 +0000 | [diff] [blame] | 34 | #include "llvm/IR/DataLayout.h" |
Gor Nishanov | 04491bd | 2017-11-11 17:00:43 +0000 | [diff] [blame] | 35 | #include "llvm/IR/Dominators.h" |
Chandler Carruth | ffd5551 | 2013-01-02 11:45:17 +0000 | [diff] [blame] | 36 | #include "llvm/IR/Intrinsics.h" |
| 37 | #include "llvm/IR/MDBuilder.h" |
| 38 | #include "llvm/IR/Operator.h" |
Gor Nishanov | 04491bd | 2017-11-11 17:00:43 +0000 | [diff] [blame] | 39 | #include "llvm/Transforms/Utils/PromoteMemToReg.h" |
Chris Lattner | bed3144 | 2007-05-28 01:07:47 +0000 | [diff] [blame] | 40 | using namespace clang; |
| 41 | using namespace CodeGen; |
| 42 | |
Vitaly Buka | 1c94332 | 2016-10-26 01:59:57 +0000 | [diff] [blame] | 43 | /// shouldEmitLifetimeMarkers - Decide whether we need emit the life-time |
| 44 | /// markers. |
| 45 | static bool shouldEmitLifetimeMarkers(const CodeGenOptions &CGOpts, |
| 46 | const LangOptions &LangOpts) { |
Mehdi Amini | 7f87307 | 2017-01-06 23:18:09 +0000 | [diff] [blame] | 47 | if (CGOpts.DisableLifetimeMarkers) |
| 48 | return false; |
| 49 | |
Vitaly Buka | 1c94332 | 2016-10-26 01:59:57 +0000 | [diff] [blame] | 50 | // Disable lifetime markers in msan builds. |
| 51 | // FIXME: Remove this when msan works with lifetime markers. |
| 52 | if (LangOpts.Sanitize.has(SanitizerKind::Memory)) |
| 53 | return false; |
| 54 | |
Benjamin Kramer | 2a7d39d | 2017-03-31 09:19:25 +0000 | [diff] [blame] | 55 | // Asan uses markers for use-after-scope checks. |
| 56 | if (CGOpts.SanitizeAddressUseAfterScope) |
| 57 | return true; |
| 58 | |
Vitaly Buka | 1c94332 | 2016-10-26 01:59:57 +0000 | [diff] [blame] | 59 | // For now, only in optimized builds. |
| 60 | return CGOpts.OptimizationLevel != 0; |
| 61 | } |
| 62 | |
Fariborz Jahanian | 6362803 | 2012-06-26 16:06:38 +0000 | [diff] [blame] | 63 | CodeGenFunction::CodeGenFunction(CodeGenModule &cgm, bool suppressNewContext) |
David Blaikie | 92848de | 2013-08-26 20:33:21 +0000 | [diff] [blame] | 64 | : CodeGenTypeCache(cgm), CGM(cgm), Target(cgm.getTarget()), |
John McCall | 7f416cc | 2015-09-08 08:05:57 +0000 | [diff] [blame] | 65 | Builder(cgm, cgm.getModule().getContext(), llvm::ConstantFolder(), |
David Blaikie | 8e90d22 | 2014-10-14 17:09:38 +0000 | [diff] [blame] | 66 | CGBuilderInserterTy(this)), |
Erich Keane | be65e87 | 2018-07-10 21:07:50 +0000 | [diff] [blame] | 67 | SanOpts(CGM.getLangOpts().Sanitize), DebugInfo(CGM.getModuleDebugInfo()), |
| 68 | PGO(cgm), ShouldEmitLifetimeMarkers(shouldEmitLifetimeMarkers( |
| 69 | CGM.getCodeGenOpts(), CGM.getLangOpts())) { |
Fariborz Jahanian | 6362803 | 2012-06-26 16:06:38 +0000 | [diff] [blame] | 70 | if (!suppressNewContext) |
| 71 | CGM.getCXXABI().getMangleContext().startNewFunction(); |
Michael Ilseman | 7a167ee | 2012-12-04 00:36:06 +0000 | [diff] [blame] | 72 | |
| 73 | llvm::FastMathFlags FMF; |
| 74 | if (CGM.getLangOpts().FastMath) |
Sanjay Patel | 401aaee | 2017-11-06 16:27:36 +0000 | [diff] [blame] | 75 | FMF.setFast(); |
Michael Ilseman | 7a167ee | 2012-12-04 00:36:06 +0000 | [diff] [blame] | 76 | if (CGM.getLangOpts().FiniteMathOnly) { |
Benjamin Kramer | 7464efc | 2012-12-09 21:58:24 +0000 | [diff] [blame] | 77 | FMF.setNoNaNs(); |
| 78 | FMF.setNoInfs(); |
Michael Ilseman | 7a167ee | 2012-12-04 00:36:06 +0000 | [diff] [blame] | 79 | } |
Pekka Jaaskelainen | 3701450 | 2014-12-10 16:41:14 +0000 | [diff] [blame] | 80 | if (CGM.getCodeGenOpts().NoNaNsFPMath) { |
| 81 | FMF.setNoNaNs(); |
| 82 | } |
| 83 | if (CGM.getCodeGenOpts().NoSignedZeros) { |
| 84 | FMF.setNoSignedZeros(); |
| 85 | } |
Sanjay Patel | 359b105 | 2015-04-09 15:03:23 +0000 | [diff] [blame] | 86 | if (CGM.getCodeGenOpts().ReciprocalMath) { |
| 87 | FMF.setAllowReciprocal(); |
| 88 | } |
Sanjay Patel | cb8c009 | 2017-12-16 16:11:17 +0000 | [diff] [blame] | 89 | if (CGM.getCodeGenOpts().Reassociate) { |
| 90 | FMF.setAllowReassoc(); |
| 91 | } |
Sanjay Patel | d61f3c7 | 2016-01-12 18:03:41 +0000 | [diff] [blame] | 92 | Builder.setFastMathFlags(FMF); |
Chris Lattner | 5696e7b | 2008-06-17 18:05:57 +0000 | [diff] [blame] | 93 | } |
Chris Lattner | d1af2d2 | 2007-05-29 23:17:50 +0000 | [diff] [blame] | 94 | |
John McCall | 08ef466 | 2011-11-10 08:15:53 +0000 | [diff] [blame] | 95 | CodeGenFunction::~CodeGenFunction() { |
Richard Smith | 736a947 | 2013-06-12 20:42:33 +0000 | [diff] [blame] | 96 | assert(LifetimeExtendedCleanupStack.empty() && "failed to emit a cleanup"); |
| 97 | |
John McCall | 08ef466 | 2011-11-10 08:15:53 +0000 | [diff] [blame] | 98 | // If there are any unclaimed block infos, go ahead and destroy them |
| 99 | // now. This can happen if IR-gen gets clever and skips evaluating |
| 100 | // something. |
| 101 | if (FirstBlockInfo) |
| 102 | destroyBlockInfos(FirstBlockInfo); |
Alexey Bataev | 9959db5 | 2014-05-06 10:08:46 +0000 | [diff] [blame] | 103 | |
Alexey Bataev | 880d860 | 2017-01-20 08:57:28 +0000 | [diff] [blame] | 104 | if (getLangOpts().OpenMP && CurFn) |
Alexey Bataev | 3eff5f4 | 2015-02-25 08:32:46 +0000 | [diff] [blame] | 105 | CGM.getOpenMPRuntime().functionFinished(*this); |
John McCall | 08ef466 | 2011-11-10 08:15:53 +0000 | [diff] [blame] | 106 | } |
| 107 | |
John McCall | 7f416cc | 2015-09-08 08:05:57 +0000 | [diff] [blame] | 108 | CharUnits CodeGenFunction::getNaturalPointeeTypeAlignment(QualType T, |
Ivan A. Kosarev | ed141ba | 2017-10-17 09:12:13 +0000 | [diff] [blame] | 109 | LValueBaseInfo *BaseInfo, |
| 110 | TBAAAccessInfo *TBAAInfo) { |
| 111 | return getNaturalTypeAlignment(T->getPointeeType(), BaseInfo, TBAAInfo, |
Ivan A. Kosarev | 78f486d | 2017-10-13 16:58:30 +0000 | [diff] [blame] | 112 | /* forPointeeType= */ true); |
David Majnemer | 9928106 | 2014-09-18 22:05:54 +0000 | [diff] [blame] | 113 | } |
Chris Lattner | d1af2d2 | 2007-05-29 23:17:50 +0000 | [diff] [blame] | 114 | |
John McCall | 7f416cc | 2015-09-08 08:05:57 +0000 | [diff] [blame] | 115 | CharUnits CodeGenFunction::getNaturalTypeAlignment(QualType T, |
Krzysztof Parzyszek | 8f24823 | 2017-05-18 17:07:11 +0000 | [diff] [blame] | 116 | LValueBaseInfo *BaseInfo, |
Ivan A. Kosarev | 78f486d | 2017-10-13 16:58:30 +0000 | [diff] [blame] | 117 | TBAAAccessInfo *TBAAInfo, |
John McCall | 7f416cc | 2015-09-08 08:05:57 +0000 | [diff] [blame] | 118 | bool forPointeeType) { |
Ivan A. Kosarev | 78f486d | 2017-10-13 16:58:30 +0000 | [diff] [blame] | 119 | if (TBAAInfo) |
| 120 | *TBAAInfo = CGM.getTBAAAccessInfo(T); |
| 121 | |
John McCall | 7f416cc | 2015-09-08 08:05:57 +0000 | [diff] [blame] | 122 | // Honor alignment typedef attributes even on incomplete types. |
| 123 | // We also honor them straight for C++ class types, even as pointees; |
| 124 | // there's an expressivity gap here. |
| 125 | if (auto TT = T->getAs<TypedefType>()) { |
| 126 | if (auto Align = TT->getDecl()->getMaxAlignment()) { |
Krzysztof Parzyszek | 8f24823 | 2017-05-18 17:07:11 +0000 | [diff] [blame] | 127 | if (BaseInfo) |
Ivan A. Kosarev | b9c59f3 | 2017-10-31 11:05:34 +0000 | [diff] [blame] | 128 | *BaseInfo = LValueBaseInfo(AlignmentSource::AttributedType); |
John McCall | 7f416cc | 2015-09-08 08:05:57 +0000 | [diff] [blame] | 129 | return getContext().toCharUnitsFromBits(Align); |
| 130 | } |
| 131 | } |
| 132 | |
Krzysztof Parzyszek | 8f24823 | 2017-05-18 17:07:11 +0000 | [diff] [blame] | 133 | if (BaseInfo) |
Ivan A. Kosarev | b9c59f3 | 2017-10-31 11:05:34 +0000 | [diff] [blame] | 134 | *BaseInfo = LValueBaseInfo(AlignmentSource::Type); |
John McCall | 7f416cc | 2015-09-08 08:05:57 +0000 | [diff] [blame] | 135 | |
| 136 | CharUnits Alignment; |
David Majnemer | 9df5637 | 2015-09-10 21:52:00 +0000 | [diff] [blame] | 137 | if (T->isIncompleteType()) { |
John McCall | 7f416cc | 2015-09-08 08:05:57 +0000 | [diff] [blame] | 138 | Alignment = CharUnits::One(); // Shouldn't be used, but pessimistic is best. |
| 139 | } else { |
| 140 | // For C++ class pointees, we don't know whether we're pointing at a |
| 141 | // base or a complete object, so we generally need to use the |
| 142 | // non-virtual alignment. |
| 143 | const CXXRecordDecl *RD; |
| 144 | if (forPointeeType && (RD = T->getAsCXXRecordDecl())) { |
| 145 | Alignment = CGM.getClassPointerAlignment(RD); |
| 146 | } else { |
| 147 | Alignment = getContext().getTypeAlignInChars(T); |
Roger Ferrer Ibanez | 3fa38a1 | 2017-03-08 14:00:44 +0000 | [diff] [blame] | 148 | if (T.getQualifiers().hasUnaligned()) |
| 149 | Alignment = CharUnits::One(); |
John McCall | 7f416cc | 2015-09-08 08:05:57 +0000 | [diff] [blame] | 150 | } |
| 151 | |
| 152 | // Cap to the global maximum type alignment unless the alignment |
| 153 | // was somehow explicit on the type. |
| 154 | if (unsigned MaxAlign = getLangOpts().MaxTypeAlign) { |
| 155 | if (Alignment.getQuantity() > MaxAlign && |
| 156 | !getContext().isAlignmentRequired(T)) |
| 157 | Alignment = CharUnits::fromQuantity(MaxAlign); |
| 158 | } |
| 159 | } |
| 160 | return Alignment; |
| 161 | } |
| 162 | |
| 163 | LValue CodeGenFunction::MakeNaturalAlignAddrLValue(llvm::Value *V, QualType T) { |
Krzysztof Parzyszek | 8f24823 | 2017-05-18 17:07:11 +0000 | [diff] [blame] | 164 | LValueBaseInfo BaseInfo; |
Ivan A. Kosarev | 78f486d | 2017-10-13 16:58:30 +0000 | [diff] [blame] | 165 | TBAAAccessInfo TBAAInfo; |
| 166 | CharUnits Alignment = getNaturalTypeAlignment(T, &BaseInfo, &TBAAInfo); |
Krzysztof Parzyszek | 8f24823 | 2017-05-18 17:07:11 +0000 | [diff] [blame] | 167 | return LValue::MakeAddr(Address(V, Alignment), T, getContext(), BaseInfo, |
Ivan A. Kosarev | 78f486d | 2017-10-13 16:58:30 +0000 | [diff] [blame] | 168 | TBAAInfo); |
John McCall | 7f416cc | 2015-09-08 08:05:57 +0000 | [diff] [blame] | 169 | } |
| 170 | |
| 171 | /// Given a value of type T* that may not be to a complete object, |
| 172 | /// construct an l-value with the natural pointee alignment of T. |
| 173 | LValue |
| 174 | CodeGenFunction::MakeNaturalAlignPointeeAddrLValue(llvm::Value *V, QualType T) { |
Krzysztof Parzyszek | 8f24823 | 2017-05-18 17:07:11 +0000 | [diff] [blame] | 175 | LValueBaseInfo BaseInfo; |
Ivan A. Kosarev | 78f486d | 2017-10-13 16:58:30 +0000 | [diff] [blame] | 176 | TBAAAccessInfo TBAAInfo; |
| 177 | CharUnits Align = getNaturalTypeAlignment(T, &BaseInfo, &TBAAInfo, |
| 178 | /* forPointeeType= */ true); |
| 179 | return MakeAddrLValue(Address(V, Align), T, BaseInfo, TBAAInfo); |
John McCall | 7f416cc | 2015-09-08 08:05:57 +0000 | [diff] [blame] | 180 | } |
| 181 | |
| 182 | |
Chris Lattner | a5f58b0 | 2011-07-09 17:41:47 +0000 | [diff] [blame] | 183 | llvm::Type *CodeGenFunction::ConvertTypeForMem(QualType T) { |
Daniel Dunbar | ee3da87 | 2009-02-03 23:03:55 +0000 | [diff] [blame] | 184 | return CGM.getTypes().ConvertTypeForMem(T); |
| 185 | } |
| 186 | |
Chris Lattner | a5f58b0 | 2011-07-09 17:41:47 +0000 | [diff] [blame] | 187 | llvm::Type *CodeGenFunction::ConvertType(QualType T) { |
Chris Lattner | f033c14 | 2007-06-22 19:05:19 +0000 | [diff] [blame] | 188 | return CGM.getTypes().ConvertType(T); |
Chris Lattner | 45bb914 | 2007-06-09 02:28:57 +0000 | [diff] [blame] | 189 | } |
Chris Lattner | d1af2d2 | 2007-05-29 23:17:50 +0000 | [diff] [blame] | 190 | |
John McCall | 47fb950 | 2013-03-07 21:37:08 +0000 | [diff] [blame] | 191 | TypeEvaluationKind CodeGenFunction::getEvaluationKind(QualType type) { |
| 192 | type = type.getCanonicalType(); |
| 193 | while (true) { |
| 194 | switch (type->getTypeClass()) { |
John McCall | 745ae28 | 2011-05-15 02:34:36 +0000 | [diff] [blame] | 195 | #define TYPE(name, parent) |
| 196 | #define ABSTRACT_TYPE(name, parent) |
| 197 | #define NON_CANONICAL_TYPE(name, parent) case Type::name: |
| 198 | #define DEPENDENT_TYPE(name, parent) case Type::name: |
| 199 | #define NON_CANONICAL_UNLESS_DEPENDENT_TYPE(name, parent) case Type::name: |
| 200 | #include "clang/AST/TypeNodes.def" |
John McCall | 47fb950 | 2013-03-07 21:37:08 +0000 | [diff] [blame] | 201 | llvm_unreachable("non-canonical or dependent type in IR-generation"); |
John McCall | 745ae28 | 2011-05-15 02:34:36 +0000 | [diff] [blame] | 202 | |
Richard Smith | 27d807c | 2013-04-30 13:56:41 +0000 | [diff] [blame] | 203 | case Type::Auto: |
Richard Smith | 600b526 | 2017-01-26 20:40:47 +0000 | [diff] [blame] | 204 | case Type::DeducedTemplateSpecialization: |
| 205 | llvm_unreachable("undeduced type in IR-generation"); |
Richard Smith | 27d807c | 2013-04-30 13:56:41 +0000 | [diff] [blame] | 206 | |
John McCall | 47fb950 | 2013-03-07 21:37:08 +0000 | [diff] [blame] | 207 | // Various scalar types. |
| 208 | case Type::Builtin: |
| 209 | case Type::Pointer: |
| 210 | case Type::BlockPointer: |
| 211 | case Type::LValueReference: |
| 212 | case Type::RValueReference: |
| 213 | case Type::MemberPointer: |
| 214 | case Type::Vector: |
| 215 | case Type::ExtVector: |
| 216 | case Type::FunctionProto: |
| 217 | case Type::FunctionNoProto: |
| 218 | case Type::Enum: |
| 219 | case Type::ObjCObjectPointer: |
Xiuli Pan | 9c14e28 | 2016-01-09 12:53:17 +0000 | [diff] [blame] | 220 | case Type::Pipe: |
John McCall | 47fb950 | 2013-03-07 21:37:08 +0000 | [diff] [blame] | 221 | return TEK_Scalar; |
John McCall | 745ae28 | 2011-05-15 02:34:36 +0000 | [diff] [blame] | 222 | |
John McCall | 47fb950 | 2013-03-07 21:37:08 +0000 | [diff] [blame] | 223 | // Complexes. |
| 224 | case Type::Complex: |
| 225 | return TEK_Complex; |
Eli Friedman | 0dfb889 | 2011-10-06 23:00:33 +0000 | [diff] [blame] | 226 | |
John McCall | 47fb950 | 2013-03-07 21:37:08 +0000 | [diff] [blame] | 227 | // Arrays, records, and Objective-C objects. |
| 228 | case Type::ConstantArray: |
| 229 | case Type::IncompleteArray: |
| 230 | case Type::VariableArray: |
| 231 | case Type::Record: |
| 232 | case Type::ObjCObject: |
| 233 | case Type::ObjCInterface: |
| 234 | return TEK_Aggregate; |
| 235 | |
| 236 | // We operate on atomic values according to their underlying type. |
| 237 | case Type::Atomic: |
| 238 | type = cast<AtomicType>(type)->getValueType(); |
| 239 | continue; |
| 240 | } |
| 241 | llvm_unreachable("unknown type kind!"); |
John McCall | 745ae28 | 2011-05-15 02:34:36 +0000 | [diff] [blame] | 242 | } |
Chris Lattner | 54fb19e | 2007-06-22 22:02:34 +0000 | [diff] [blame] | 243 | } |
| 244 | |
David Blaikie | 66e4197 | 2015-01-14 07:38:27 +0000 | [diff] [blame] | 245 | llvm::DebugLoc CodeGenFunction::EmitReturnBlock() { |
Daniel Dunbar | fd346a3 | 2009-01-26 23:27:52 +0000 | [diff] [blame] | 246 | // For cleanliness, we try to avoid emitting the return block for |
| 247 | // simple cases. |
| 248 | llvm::BasicBlock *CurBB = Builder.GetInsertBlock(); |
| 249 | |
| 250 | if (CurBB) { |
| 251 | assert(!CurBB->getTerminator() && "Unexpected terminated block."); |
| 252 | |
Daniel Dunbar | ea3060a | 2009-07-19 08:24:34 +0000 | [diff] [blame] | 253 | // We have a valid insert point, reuse it if it is empty or there are no |
| 254 | // explicit jumps to the return block. |
John McCall | ad5d61e | 2010-07-23 21:56:41 +0000 | [diff] [blame] | 255 | if (CurBB->empty() || ReturnBlock.getBlock()->use_empty()) { |
| 256 | ReturnBlock.getBlock()->replaceAllUsesWith(CurBB); |
| 257 | delete ReturnBlock.getBlock(); |
John McCall | 8b36ac8 | 2019-04-10 17:03:09 +0000 | [diff] [blame] | 258 | ReturnBlock = JumpDest(); |
Daniel Dunbar | ea3060a | 2009-07-19 08:24:34 +0000 | [diff] [blame] | 259 | } else |
John McCall | ad5d61e | 2010-07-23 21:56:41 +0000 | [diff] [blame] | 260 | EmitBlock(ReturnBlock.getBlock()); |
David Blaikie | 66e4197 | 2015-01-14 07:38:27 +0000 | [diff] [blame] | 261 | return llvm::DebugLoc(); |
Daniel Dunbar | fd346a3 | 2009-01-26 23:27:52 +0000 | [diff] [blame] | 262 | } |
| 263 | |
| 264 | // Otherwise, if the return block is the target of a single direct |
| 265 | // branch then we can just put the code in that block instead. This |
| 266 | // cleans up functions which started with a unified return block. |
John McCall | ad5d61e | 2010-07-23 21:56:41 +0000 | [diff] [blame] | 267 | if (ReturnBlock.getBlock()->hasOneUse()) { |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 268 | llvm::BranchInst *BI = |
Chandler Carruth | 4d01fff | 2014-03-09 03:16:50 +0000 | [diff] [blame] | 269 | dyn_cast<llvm::BranchInst>(*ReturnBlock.getBlock()->user_begin()); |
John McCall | bd30929 | 2010-07-06 01:34:17 +0000 | [diff] [blame] | 270 | if (BI && BI->isUnconditional() && |
John McCall | ad5d61e | 2010-07-23 21:56:41 +0000 | [diff] [blame] | 271 | BI->getSuccessor(0) == ReturnBlock.getBlock()) { |
David Blaikie | 66e4197 | 2015-01-14 07:38:27 +0000 | [diff] [blame] | 272 | // Record/return the DebugLoc of the simple 'return' expression to be used |
| 273 | // later by the actual 'ret' instruction. |
| 274 | llvm::DebugLoc Loc = BI->getDebugLoc(); |
Daniel Dunbar | fd346a3 | 2009-01-26 23:27:52 +0000 | [diff] [blame] | 275 | Builder.SetInsertPoint(BI->getParent()); |
| 276 | BI->eraseFromParent(); |
John McCall | ad5d61e | 2010-07-23 21:56:41 +0000 | [diff] [blame] | 277 | delete ReturnBlock.getBlock(); |
John McCall | 8b36ac8 | 2019-04-10 17:03:09 +0000 | [diff] [blame] | 278 | ReturnBlock = JumpDest(); |
David Blaikie | 66e4197 | 2015-01-14 07:38:27 +0000 | [diff] [blame] | 279 | return Loc; |
Daniel Dunbar | fd346a3 | 2009-01-26 23:27:52 +0000 | [diff] [blame] | 280 | } |
| 281 | } |
| 282 | |
Mike Stump | 18bb928 | 2009-05-16 07:57:57 +0000 | [diff] [blame] | 283 | // FIXME: We are at an unreachable point, there is no reason to emit the block |
| 284 | // unless it has uses. However, we still need a place to put the debug |
| 285 | // region.end for now. |
Daniel Dunbar | fd346a3 | 2009-01-26 23:27:52 +0000 | [diff] [blame] | 286 | |
John McCall | ad5d61e | 2010-07-23 21:56:41 +0000 | [diff] [blame] | 287 | EmitBlock(ReturnBlock.getBlock()); |
David Blaikie | 66e4197 | 2015-01-14 07:38:27 +0000 | [diff] [blame] | 288 | return llvm::DebugLoc(); |
John McCall | bd30929 | 2010-07-06 01:34:17 +0000 | [diff] [blame] | 289 | } |
| 290 | |
| 291 | static void EmitIfUsed(CodeGenFunction &CGF, llvm::BasicBlock *BB) { |
| 292 | if (!BB) return; |
| 293 | if (!BB->use_empty()) |
| 294 | return CGF.CurFn->getBasicBlockList().push_back(BB); |
| 295 | delete BB; |
Daniel Dunbar | fd346a3 | 2009-01-26 23:27:52 +0000 | [diff] [blame] | 296 | } |
| 297 | |
Daniel Dunbar | 89654ee | 2008-08-26 08:29:31 +0000 | [diff] [blame] | 298 | void CodeGenFunction::FinishFunction(SourceLocation EndLoc) { |
Chris Lattner | e73e432 | 2007-07-16 21:28:45 +0000 | [diff] [blame] | 299 | assert(BreakContinueStack.empty() && |
| 300 | "mismatched push/pop in break/continue stack!"); |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 301 | |
Adrian Prantl | 52bf3c4 | 2013-05-03 20:11:48 +0000 | [diff] [blame] | 302 | bool OnlySimpleReturnStmts = NumSimpleReturnExprs > 0 |
Adrian Prantl | 524ba1f | 2013-07-25 00:23:42 +0000 | [diff] [blame] | 303 | && NumSimpleReturnExprs == NumReturnExprs |
| 304 | && ReturnBlock.getBlock()->use_empty(); |
| 305 | // Usually the return expression is evaluated before the cleanup |
| 306 | // code. If the function contains only a simple return statement, |
| 307 | // such as a constant, the location before the cleanup code becomes |
| 308 | // the last useful breakpoint in the function, because the simple |
| 309 | // return expression will be evaluated after the cleanup code. To be |
| 310 | // safe, set the debug location for cleanup code to the location of |
| 311 | // the return statement. Otherwise the cleanup code should be at the |
| 312 | // end of the function's lexical scope. |
| 313 | // |
| 314 | // If there are multiple branches to the return block, the branch |
| 315 | // instructions will get the location of the return statements and |
| 316 | // all will be fine. |
Adrian Prantl | 3be1054 | 2013-05-02 17:30:20 +0000 | [diff] [blame] | 317 | if (CGDebugInfo *DI = getDebugInfo()) { |
Adrian Prantl | 52bf3c4 | 2013-05-03 20:11:48 +0000 | [diff] [blame] | 318 | if (OnlySimpleReturnStmts) |
Adrian Prantl | e83b130 | 2014-01-07 22:05:52 +0000 | [diff] [blame] | 319 | DI->EmitLocation(Builder, LastStopPoint); |
Adrian Prantl | 3be1054 | 2013-05-02 17:30:20 +0000 | [diff] [blame] | 320 | else |
Calixte Denizet | fcd661d | 2018-09-24 18:24:18 +0000 | [diff] [blame] | 321 | DI->EmitLocation(Builder, EndLoc); |
Adrian Prantl | 3be1054 | 2013-05-02 17:30:20 +0000 | [diff] [blame] | 322 | } |
David Blaikie | 357aafb | 2013-02-01 19:09:49 +0000 | [diff] [blame] | 323 | |
John McCall | 31168b0 | 2011-06-15 23:02:42 +0000 | [diff] [blame] | 324 | // Pop any cleanups that might have been associated with the |
| 325 | // parameters. Do this in whatever block we're currently in; it's |
| 326 | // important to do this before we enter the return block or return |
| 327 | // edges will be *really* confused. |
David Majnemer | dc012fa | 2015-04-22 21:38:15 +0000 | [diff] [blame] | 328 | bool HasCleanups = EHStack.stable_begin() != PrologueCleanupDepth; |
| 329 | bool HasOnlyLifetimeMarkers = |
| 330 | HasCleanups && EHStack.containsOnlyLifetimeMarkers(PrologueCleanupDepth); |
| 331 | bool EmitRetDbgLoc = !HasCleanups || HasOnlyLifetimeMarkers; |
| 332 | if (HasCleanups) { |
Adrian Prantl | 3be1054 | 2013-05-02 17:30:20 +0000 | [diff] [blame] | 333 | // Make sure the line table doesn't jump back into the body for |
| 334 | // the ret after it's been at EndLoc. |
Adrian Prantl | 3be1054 | 2013-05-02 17:30:20 +0000 | [diff] [blame] | 335 | if (CGDebugInfo *DI = getDebugInfo()) |
Adrian Prantl | 52bf3c4 | 2013-05-03 20:11:48 +0000 | [diff] [blame] | 336 | if (OnlySimpleReturnStmts) |
Calixte Denizet | fcd661d | 2018-09-24 18:24:18 +0000 | [diff] [blame] | 337 | DI->EmitLocation(Builder, EndLoc); |
David Blaikie | 4d52443 | 2015-02-04 19:47:54 +0000 | [diff] [blame] | 338 | |
| 339 | PopCleanupBlocks(PrologueCleanupDepth); |
Adrian Prantl | 3be1054 | 2013-05-02 17:30:20 +0000 | [diff] [blame] | 340 | } |
| 341 | |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 342 | // Emit function epilog (to return). |
David Blaikie | 66e4197 | 2015-01-14 07:38:27 +0000 | [diff] [blame] | 343 | llvm::DebugLoc Loc = EmitReturnBlock(); |
Daniel Dunbar | fab3f93 | 2008-11-11 20:59:54 +0000 | [diff] [blame] | 344 | |
Hans Wennborg | 76c26c1 | 2017-11-14 21:13:27 +0000 | [diff] [blame] | 345 | if (ShouldInstrumentFunction()) { |
Hans Wennborg | 14e8a5a | 2017-11-21 17:30:34 +0000 | [diff] [blame] | 346 | if (CGM.getCodeGenOpts().InstrumentFunctions) |
| 347 | CurFn->addFnAttr("instrument-function-exit", "__cyg_profile_func_exit"); |
| 348 | if (CGM.getCodeGenOpts().InstrumentFunctionsAfterInlining) |
| 349 | CurFn->addFnAttr("instrument-function-exit-inlined", |
| 350 | "__cyg_profile_func_exit"); |
Hans Wennborg | 76c26c1 | 2017-11-14 21:13:27 +0000 | [diff] [blame] | 351 | } |
Chris Lattner | 3c77a35 | 2010-06-22 00:03:40 +0000 | [diff] [blame] | 352 | |
Daniel Dunbar | fab3f93 | 2008-11-11 20:59:54 +0000 | [diff] [blame] | 353 | // Emit debug descriptor for function end. |
David Blaikie | 66e4197 | 2015-01-14 07:38:27 +0000 | [diff] [blame] | 354 | if (CGDebugInfo *DI = getDebugInfo()) |
Keno Fischer | 41d4b4e | 2017-06-01 21:14:03 +0000 | [diff] [blame] | 355 | DI->EmitFunctionEnd(Builder, CurFn); |
Daniel Dunbar | fab3f93 | 2008-11-11 20:59:54 +0000 | [diff] [blame] | 356 | |
David Blaikie | 66e4197 | 2015-01-14 07:38:27 +0000 | [diff] [blame] | 357 | // Reset the debug location to that of the simple 'return' expression, if any |
| 358 | // rather than that of the end of the function's scope '}'. |
| 359 | ApplyDebugLocation AL(*this, Loc); |
Nick Lewycky | 2d84e84 | 2013-10-02 02:29:49 +0000 | [diff] [blame] | 360 | EmitFunctionEpilog(*CurFnInfo, EmitRetDbgLoc, EndLoc); |
Mike Stump | 1d84921 | 2009-12-07 23:38:24 +0000 | [diff] [blame] | 361 | EmitEndEHSpec(CurCodeDecl); |
Daniel Dunbar | 54bb193 | 2008-09-09 21:00:17 +0000 | [diff] [blame] | 362 | |
John McCall | bd30929 | 2010-07-06 01:34:17 +0000 | [diff] [blame] | 363 | assert(EHStack.empty() && |
| 364 | "did not remove all scopes from cleanup stack!"); |
| 365 | |
Chris Lattner | 6c4d255 | 2009-10-28 23:59:40 +0000 | [diff] [blame] | 366 | // If someone did an indirect goto, emit the indirect goto block at the end of |
| 367 | // the function. |
| 368 | if (IndirectBranch) { |
| 369 | EmitBlock(IndirectBranch->getParent()); |
| 370 | Builder.ClearInsertionPoint(); |
| 371 | } |
Michael Ilseman | 686240a | 2012-12-04 00:29:55 +0000 | [diff] [blame] | 372 | |
Reid Kleckner | 98cb8ba | 2015-07-07 22:26:07 +0000 | [diff] [blame] | 373 | // If some of our locals escaped, insert a call to llvm.localescape in the |
Reid Kleckner | 31a1bb0 | 2015-04-08 22:23:48 +0000 | [diff] [blame] | 374 | // entry block. |
| 375 | if (!EscapedLocals.empty()) { |
| 376 | // Invert the map from local to index into a simple vector. There should be |
| 377 | // no holes. |
| 378 | SmallVector<llvm::Value *, 4> EscapeArgs; |
| 379 | EscapeArgs.resize(EscapedLocals.size()); |
| 380 | for (auto &Pair : EscapedLocals) |
| 381 | EscapeArgs[Pair.second] = Pair.first; |
| 382 | llvm::Function *FrameEscapeFn = llvm::Intrinsic::getDeclaration( |
Reid Kleckner | 98cb8ba | 2015-07-07 22:26:07 +0000 | [diff] [blame] | 383 | &CGM.getModule(), llvm::Intrinsic::localescape); |
John McCall | 7f416cc | 2015-09-08 08:05:57 +0000 | [diff] [blame] | 384 | CGBuilderTy(*this, AllocaInsertPt).CreateCall(FrameEscapeFn, EscapeArgs); |
Reid Kleckner | 31a1bb0 | 2015-04-08 22:23:48 +0000 | [diff] [blame] | 385 | } |
| 386 | |
Chris Lattner | c48023b | 2007-12-02 06:32:24 +0000 | [diff] [blame] | 387 | // Remove the AllocaInsertPt instruction, which is just a convenience for us. |
Chris Lattner | 2739d2b | 2009-03-31 22:17:44 +0000 | [diff] [blame] | 388 | llvm::Instruction *Ptr = AllocaInsertPt; |
Craig Topper | 8a13c41 | 2014-05-21 05:09:00 +0000 | [diff] [blame] | 389 | AllocaInsertPt = nullptr; |
Chris Lattner | 2739d2b | 2009-03-31 22:17:44 +0000 | [diff] [blame] | 390 | Ptr->eraseFromParent(); |
Michael Ilseman | 686240a | 2012-12-04 00:29:55 +0000 | [diff] [blame] | 391 | |
Chris Lattner | 6c4d255 | 2009-10-28 23:59:40 +0000 | [diff] [blame] | 392 | // If someone took the address of a label but never did an indirect goto, we |
| 393 | // made a zero entry PHI node, which is illegal, zap it now. |
| 394 | if (IndirectBranch) { |
| 395 | llvm::PHINode *PN = cast<llvm::PHINode>(IndirectBranch->getAddress()); |
| 396 | if (PN->getNumIncomingValues() == 0) { |
| 397 | PN->replaceAllUsesWith(llvm::UndefValue::get(PN->getType())); |
| 398 | PN->eraseFromParent(); |
| 399 | } |
| 400 | } |
John McCall | bd30929 | 2010-07-06 01:34:17 +0000 | [diff] [blame] | 401 | |
John McCall | 8e4c74b | 2011-08-11 02:22:43 +0000 | [diff] [blame] | 402 | EmitIfUsed(*this, EHResumeBlock); |
John McCall | bd30929 | 2010-07-06 01:34:17 +0000 | [diff] [blame] | 403 | EmitIfUsed(*this, TerminateLandingPad); |
| 404 | EmitIfUsed(*this, TerminateHandler); |
| 405 | EmitIfUsed(*this, UnreachableBlock); |
John McCall | 09ae032 | 2010-07-06 23:57:41 +0000 | [diff] [blame] | 406 | |
Reid Kleckner | 06f19a0 | 2018-01-02 21:34:16 +0000 | [diff] [blame] | 407 | for (const auto &FuncletAndParent : TerminateFunclets) |
| 408 | EmitIfUsed(*this, FuncletAndParent.second); |
| 409 | |
John McCall | 09ae032 | 2010-07-06 23:57:41 +0000 | [diff] [blame] | 410 | if (CGM.getCodeGenOpts().EmitDeclMetadata) |
| 411 | EmitDeclMetadata(); |
Reid Kleckner | 314ef7b | 2014-02-01 00:04:45 +0000 | [diff] [blame] | 412 | |
| 413 | for (SmallVectorImpl<std::pair<llvm::Instruction *, llvm::Value *> >::iterator |
| 414 | I = DeferredReplacements.begin(), |
| 415 | E = DeferredReplacements.end(); |
| 416 | I != E; ++I) { |
| 417 | I->first->replaceAllUsesWith(I->second); |
| 418 | I->first->eraseFromParent(); |
| 419 | } |
Gor Nishanov | 04491bd | 2017-11-11 17:00:43 +0000 | [diff] [blame] | 420 | |
| 421 | // Eliminate CleanupDestSlot alloca by replacing it with SSA values and |
| 422 | // PHIs if the current function is a coroutine. We don't do it for all |
| 423 | // functions as it may result in slight increase in numbers of instructions |
| 424 | // if compiled with no optimizations. We do it for coroutine as the lifetime |
| 425 | // of CleanupDestSlot alloca make correct coroutine frame building very |
| 426 | // difficult. |
John McCall | 5cdf038 | 2018-01-12 22:07:01 +0000 | [diff] [blame] | 427 | if (NormalCleanupDest.isValid() && isCoroutine()) { |
Gor Nishanov | 04491bd | 2017-11-11 17:00:43 +0000 | [diff] [blame] | 428 | llvm::DominatorTree DT(*CurFn); |
John McCall | 5cdf038 | 2018-01-12 22:07:01 +0000 | [diff] [blame] | 429 | llvm::PromoteMemToReg( |
| 430 | cast<llvm::AllocaInst>(NormalCleanupDest.getPointer()), DT); |
| 431 | NormalCleanupDest = Address::invalid(); |
Gor Nishanov | 04491bd | 2017-11-11 17:00:43 +0000 | [diff] [blame] | 432 | } |
Craig Topper | 74c10e3 | 2018-07-09 19:00:16 +0000 | [diff] [blame] | 433 | |
Craig Topper | 3113ec3 | 2018-10-24 17:42:17 +0000 | [diff] [blame] | 434 | // Scan function arguments for vector width. |
| 435 | for (llvm::Argument &A : CurFn->args()) |
| 436 | if (auto *VT = dyn_cast<llvm::VectorType>(A.getType())) |
| 437 | LargestVectorWidth = std::max(LargestVectorWidth, |
| 438 | VT->getPrimitiveSizeInBits()); |
| 439 | |
| 440 | // Update vector width based on return type. |
| 441 | if (auto *VT = dyn_cast<llvm::VectorType>(CurFn->getReturnType())) |
| 442 | LargestVectorWidth = std::max(LargestVectorWidth, |
| 443 | VT->getPrimitiveSizeInBits()); |
| 444 | |
| 445 | // Add the required-vector-width attribute. This contains the max width from: |
| 446 | // 1. min-vector-width attribute used in the source program. |
| 447 | // 2. Any builtins used that have a vector width specified. |
| 448 | // 3. Values passed in and out of inline assembly. |
| 449 | // 4. Width of vector arguments and return types for this function. |
| 450 | // 5. Width of vector aguments and return types for functions called by this |
| 451 | // function. |
Craig Topper | 00897e9 | 2018-10-25 05:04:35 +0000 | [diff] [blame] | 452 | CurFn->addFnAttr("min-legal-vector-width", llvm::utostr(LargestVectorWidth)); |
John McCall | 8b36ac8 | 2019-04-10 17:03:09 +0000 | [diff] [blame] | 453 | |
| 454 | // If we generated an unreachable return block, delete it now. |
| 455 | if (ReturnBlock.isValid() && ReturnBlock.getBlock()->use_empty()) { |
| 456 | Builder.ClearInsertionPoint(); |
| 457 | ReturnBlock.getBlock()->eraseFromParent(); |
| 458 | } |
| 459 | if (ReturnValue.isValid()) { |
| 460 | auto *RetAlloca = dyn_cast<llvm::AllocaInst>(ReturnValue.getPointer()); |
| 461 | if (RetAlloca && RetAlloca->use_empty()) { |
| 462 | RetAlloca->eraseFromParent(); |
| 463 | ReturnValue = Address::invalid(); |
| 464 | } |
| 465 | } |
Chris Lattner | d1af2d2 | 2007-05-29 23:17:50 +0000 | [diff] [blame] | 466 | } |
Chris Lattner | 308f431 | 2007-05-29 23:50:05 +0000 | [diff] [blame] | 467 | |
Chris Lattner | 3c77a35 | 2010-06-22 00:03:40 +0000 | [diff] [blame] | 468 | /// ShouldInstrumentFunction - Return true if the current function should be |
| 469 | /// instrumented with __cyg_profile_func_* calls |
| 470 | bool CodeGenFunction::ShouldInstrumentFunction() { |
Hans Wennborg | 76c26c1 | 2017-11-14 21:13:27 +0000 | [diff] [blame] | 471 | if (!CGM.getCodeGenOpts().InstrumentFunctions && |
Hans Wennborg | 14e8a5a | 2017-11-21 17:30:34 +0000 | [diff] [blame] | 472 | !CGM.getCodeGenOpts().InstrumentFunctionsAfterInlining && |
| 473 | !CGM.getCodeGenOpts().InstrumentFunctionEntryBare) |
Chris Lattner | 3c77a35 | 2010-06-22 00:03:40 +0000 | [diff] [blame] | 474 | return false; |
Ted Kremenek | c249c41 | 2011-05-16 23:49:20 +0000 | [diff] [blame] | 475 | if (!CurFuncDecl || CurFuncDecl->hasAttr<NoInstrumentFunctionAttr>()) |
Chris Lattner | 3c77a35 | 2010-06-22 00:03:40 +0000 | [diff] [blame] | 476 | return false; |
| 477 | return true; |
| 478 | } |
| 479 | |
Aaron Ballman | 7d2aecb | 2016-07-13 22:32:15 +0000 | [diff] [blame] | 480 | /// ShouldXRayInstrument - Return true if the current function should be |
| 481 | /// instrumented with XRay nop sleds. |
| 482 | bool CodeGenFunction::ShouldXRayInstrumentFunction() const { |
| 483 | return CGM.getCodeGenOpts().XRayInstrumentFunctions; |
| 484 | } |
| 485 | |
Dean Michael Berris | 1a5b10d | 2017-11-30 00:04:54 +0000 | [diff] [blame] | 486 | /// AlwaysEmitXRayCustomEvents - Return true if we should emit IR for calls to |
Keith Wyss | f437e35 | 2018-04-17 21:32:43 +0000 | [diff] [blame] | 487 | /// the __xray_customevent(...) builtin calls, when doing XRay instrumentation. |
Dean Michael Berris | 1a5b10d | 2017-11-30 00:04:54 +0000 | [diff] [blame] | 488 | bool CodeGenFunction::AlwaysEmitXRayCustomEvents() const { |
Dean Michael Berris | 488f7c2 | 2018-04-13 02:31:58 +0000 | [diff] [blame] | 489 | return CGM.getCodeGenOpts().XRayInstrumentFunctions && |
| 490 | (CGM.getCodeGenOpts().XRayAlwaysEmitCustomEvents || |
| 491 | CGM.getCodeGenOpts().XRayInstrumentationBundle.Mask == |
| 492 | XRayInstrKind::Custom); |
Dean Michael Berris | 1a5b10d | 2017-11-30 00:04:54 +0000 | [diff] [blame] | 493 | } |
| 494 | |
Keith Wyss | f437e35 | 2018-04-17 21:32:43 +0000 | [diff] [blame] | 495 | bool CodeGenFunction::AlwaysEmitXRayTypedEvents() const { |
| 496 | return CGM.getCodeGenOpts().XRayInstrumentFunctions && |
| 497 | (CGM.getCodeGenOpts().XRayAlwaysEmitTypedEvents || |
| 498 | CGM.getCodeGenOpts().XRayInstrumentationBundle.Mask == |
| 499 | XRayInstrKind::Typed); |
| 500 | } |
| 501 | |
Vedant Kumar | bb5d485 | 2017-09-13 00:04:35 +0000 | [diff] [blame] | 502 | llvm::Constant * |
| 503 | CodeGenFunction::EncodeAddrForUseInPrologue(llvm::Function *F, |
| 504 | llvm::Constant *Addr) { |
| 505 | // Addresses stored in prologue data can't require run-time fixups and must |
| 506 | // be PC-relative. Run-time fixups are undesirable because they necessitate |
| 507 | // writable text segments, which are unsafe. And absolute addresses are |
| 508 | // undesirable because they break PIE mode. |
| 509 | |
| 510 | // Add a layer of indirection through a private global. Taking its address |
| 511 | // won't result in a run-time fixup, even if Addr has linkonce_odr linkage. |
| 512 | auto *GV = new llvm::GlobalVariable(CGM.getModule(), Addr->getType(), |
| 513 | /*isConstant=*/true, |
| 514 | llvm::GlobalValue::PrivateLinkage, Addr); |
| 515 | |
| 516 | // Create a PC-relative address. |
| 517 | auto *GOTAsInt = llvm::ConstantExpr::getPtrToInt(GV, IntPtrTy); |
| 518 | auto *FuncAsInt = llvm::ConstantExpr::getPtrToInt(F, IntPtrTy); |
| 519 | auto *PCRelAsInt = llvm::ConstantExpr::getSub(GOTAsInt, FuncAsInt); |
| 520 | return (IntPtrTy == Int32Ty) |
| 521 | ? PCRelAsInt |
| 522 | : llvm::ConstantExpr::getTrunc(PCRelAsInt, Int32Ty); |
| 523 | } |
| 524 | |
| 525 | llvm::Value * |
| 526 | CodeGenFunction::DecodeAddrUsedInPrologue(llvm::Value *F, |
| 527 | llvm::Value *EncodedAddr) { |
| 528 | // Reconstruct the address of the global. |
| 529 | auto *PCRelAsInt = Builder.CreateSExt(EncodedAddr, IntPtrTy); |
| 530 | auto *FuncAsInt = Builder.CreatePtrToInt(F, IntPtrTy, "func_addr.int"); |
| 531 | auto *GOTAsInt = Builder.CreateAdd(PCRelAsInt, FuncAsInt, "global_addr.int"); |
| 532 | auto *GOTAddr = Builder.CreateIntToPtr(GOTAsInt, Int8PtrPtrTy, "global_addr"); |
| 533 | |
| 534 | // Load the original pointer through the global. |
| 535 | return Builder.CreateLoad(Address(GOTAddr, getPointerAlign()), |
| 536 | "decoded_addr"); |
| 537 | } |
| 538 | |
Michael Ilseman | 686240a | 2012-12-04 00:29:55 +0000 | [diff] [blame] | 539 | void CodeGenFunction::EmitOpenCLKernelMetadata(const FunctionDecl *FD, |
Tanya Lattner | bcffcdf | 2012-07-09 22:06:01 +0000 | [diff] [blame] | 540 | llvm::Function *Fn) |
| 541 | { |
| 542 | if (!FD->hasAttr<OpenCLKernelAttr>()) |
| 543 | return; |
| 544 | |
| 545 | llvm::LLVMContext &Context = getLLVMContext(); |
| 546 | |
Anastasia Stulova | e6cf6c7 | 2019-05-09 13:55:44 +0000 | [diff] [blame] | 547 | CGM.GenOpenCLArgMetadata(Fn, FD, this); |
Michael Ilseman | 686240a | 2012-12-04 00:29:55 +0000 | [diff] [blame] | 548 | |
Aaron Ballman | c432799 | 2013-12-19 03:09:10 +0000 | [diff] [blame] | 549 | if (const VecTypeHintAttr *A = FD->getAttr<VecTypeHintAttr>()) { |
Xiuli Pan | be6da4b | 2017-05-04 07:31:20 +0000 | [diff] [blame] | 550 | QualType HintQTy = A->getTypeHint(); |
| 551 | const ExtVectorType *HintEltQTy = HintQTy->getAs<ExtVectorType>(); |
| 552 | bool IsSignedInteger = |
| 553 | HintQTy->isSignedIntegerType() || |
| 554 | (HintEltQTy && HintEltQTy->getElementType()->isSignedIntegerType()); |
| 555 | llvm::Metadata *AttrMDArgs[] = { |
Duncan P. N. Exon Smith | fb49491 | 2014-12-09 18:39:32 +0000 | [diff] [blame] | 556 | llvm::ConstantAsMetadata::get(llvm::UndefValue::get( |
| 557 | CGM.getTypes().ConvertType(A->getTypeHint()))), |
| 558 | llvm::ConstantAsMetadata::get(llvm::ConstantInt::get( |
| 559 | llvm::IntegerType::get(Context, 32), |
Xiuli Pan | be6da4b | 2017-05-04 07:31:20 +0000 | [diff] [blame] | 560 | llvm::APInt(32, (uint64_t)(IsSignedInteger ? 1 : 0))))}; |
| 561 | Fn->setMetadata("vec_type_hint", llvm::MDNode::get(Context, AttrMDArgs)); |
Joey Gouly | aba589c | 2013-03-08 09:42:32 +0000 | [diff] [blame] | 562 | } |
| 563 | |
Aaron Ballman | c432799 | 2013-12-19 03:09:10 +0000 | [diff] [blame] | 564 | if (const WorkGroupSizeHintAttr *A = FD->getAttr<WorkGroupSizeHintAttr>()) { |
Xiuli Pan | be6da4b | 2017-05-04 07:31:20 +0000 | [diff] [blame] | 565 | llvm::Metadata *AttrMDArgs[] = { |
Duncan P. N. Exon Smith | fb49491 | 2014-12-09 18:39:32 +0000 | [diff] [blame] | 566 | llvm::ConstantAsMetadata::get(Builder.getInt32(A->getXDim())), |
| 567 | llvm::ConstantAsMetadata::get(Builder.getInt32(A->getYDim())), |
| 568 | llvm::ConstantAsMetadata::get(Builder.getInt32(A->getZDim()))}; |
Xiuli Pan | be6da4b | 2017-05-04 07:31:20 +0000 | [diff] [blame] | 569 | Fn->setMetadata("work_group_size_hint", llvm::MDNode::get(Context, AttrMDArgs)); |
Tanya Lattner | bcffcdf | 2012-07-09 22:06:01 +0000 | [diff] [blame] | 570 | } |
| 571 | |
Aaron Ballman | c432799 | 2013-12-19 03:09:10 +0000 | [diff] [blame] | 572 | if (const ReqdWorkGroupSizeAttr *A = FD->getAttr<ReqdWorkGroupSizeAttr>()) { |
Xiuli Pan | be6da4b | 2017-05-04 07:31:20 +0000 | [diff] [blame] | 573 | llvm::Metadata *AttrMDArgs[] = { |
Duncan P. N. Exon Smith | fb49491 | 2014-12-09 18:39:32 +0000 | [diff] [blame] | 574 | llvm::ConstantAsMetadata::get(Builder.getInt32(A->getXDim())), |
| 575 | llvm::ConstantAsMetadata::get(Builder.getInt32(A->getYDim())), |
| 576 | llvm::ConstantAsMetadata::get(Builder.getInt32(A->getZDim()))}; |
Xiuli Pan | be6da4b | 2017-05-04 07:31:20 +0000 | [diff] [blame] | 577 | Fn->setMetadata("reqd_work_group_size", llvm::MDNode::get(Context, AttrMDArgs)); |
| 578 | } |
| 579 | |
| 580 | if (const OpenCLIntelReqdSubGroupSizeAttr *A = |
| 581 | FD->getAttr<OpenCLIntelReqdSubGroupSizeAttr>()) { |
| 582 | llvm::Metadata *AttrMDArgs[] = { |
| 583 | llvm::ConstantAsMetadata::get(Builder.getInt32(A->getSubGroupSize()))}; |
| 584 | Fn->setMetadata("intel_reqd_sub_group_size", |
| 585 | llvm::MDNode::get(Context, AttrMDArgs)); |
Tanya Lattner | bcffcdf | 2012-07-09 22:06:01 +0000 | [diff] [blame] | 586 | } |
Tanya Lattner | bcffcdf | 2012-07-09 22:06:01 +0000 | [diff] [blame] | 587 | } |
| 588 | |
Adrian Prantl | 2cede0f | 2014-04-29 01:07:59 +0000 | [diff] [blame] | 589 | /// Determine whether the function F ends with a return stmt. |
| 590 | static bool endsWithReturn(const Decl* F) { |
| 591 | const Stmt *Body = nullptr; |
| 592 | if (auto *FD = dyn_cast_or_null<FunctionDecl>(F)) |
| 593 | Body = FD->getBody(); |
| 594 | else if (auto *OMD = dyn_cast_or_null<ObjCMethodDecl>(F)) |
| 595 | Body = OMD->getBody(); |
| 596 | |
| 597 | if (auto *CS = dyn_cast_or_null<CompoundStmt>(Body)) { |
| 598 | auto LastStmt = CS->body_rbegin(); |
| 599 | if (LastStmt != CS->body_rend()) |
| 600 | return isa<ReturnStmt>(*LastStmt); |
| 601 | } |
| 602 | return false; |
| 603 | } |
| 604 | |
Akira Hatanaka | 9978da3 | 2018-08-10 15:09:24 +0000 | [diff] [blame] | 605 | void CodeGenFunction::markAsIgnoreThreadCheckingAtRuntime(llvm::Function *Fn) { |
| 606 | if (SanOpts.has(SanitizerKind::Thread)) { |
| 607 | Fn->addFnAttr("sanitize_thread_no_checking_at_run_time"); |
| 608 | Fn->removeFnAttr(llvm::Attribute::SanitizeThread); |
| 609 | } |
Anna Zaks | e43b4fc | 2017-01-13 00:50:50 +0000 | [diff] [blame] | 610 | } |
| 611 | |
Vlad Tsyrklevich | 3f3aad2 | 2017-08-04 21:21:00 +0000 | [diff] [blame] | 612 | static bool matchesStlAllocatorFn(const Decl *D, const ASTContext &Ctx) { |
| 613 | auto *MD = dyn_cast_or_null<CXXMethodDecl>(D); |
| 614 | if (!MD || !MD->getDeclName().getAsIdentifierInfo() || |
| 615 | !MD->getDeclName().getAsIdentifierInfo()->isStr("allocate") || |
| 616 | (MD->getNumParams() != 1 && MD->getNumParams() != 2)) |
| 617 | return false; |
| 618 | |
| 619 | if (MD->parameters()[0]->getType().getCanonicalType() != Ctx.getSizeType()) |
| 620 | return false; |
| 621 | |
| 622 | if (MD->getNumParams() == 2) { |
| 623 | auto *PT = MD->parameters()[1]->getType()->getAs<PointerType>(); |
| 624 | if (!PT || !PT->isVoidPointerType() || |
| 625 | !PT->getPointeeType().isConstQualified()) |
| 626 | return false; |
| 627 | } |
| 628 | |
| 629 | return true; |
| 630 | } |
| 631 | |
Vedant Kumar | aa4ea5f | 2017-10-14 01:23:30 +0000 | [diff] [blame] | 632 | /// Return the UBSan prologue signature for \p FD if one is available. |
| 633 | static llvm::Constant *getPrologueSignature(CodeGenModule &CGM, |
| 634 | const FunctionDecl *FD) { |
| 635 | if (const auto *MD = dyn_cast<CXXMethodDecl>(FD)) |
| 636 | if (!MD->isStatic()) |
| 637 | return nullptr; |
| 638 | return CGM.getTargetCodeGenInfo().getUBSanFunctionSignature(CGM); |
| 639 | } |
| 640 | |
John McCall | dec348f7 | 2013-05-03 07:33:41 +0000 | [diff] [blame] | 641 | void CodeGenFunction::StartFunction(GlobalDecl GD, |
| 642 | QualType RetTy, |
Daniel Dunbar | bc915f4 | 2008-09-09 23:14:03 +0000 | [diff] [blame] | 643 | llvm::Function *Fn, |
John McCall | a738c25 | 2011-03-09 04:27:21 +0000 | [diff] [blame] | 644 | const CGFunctionInfo &FnInfo, |
Daniel Dunbar | 354d278 | 2008-10-18 18:22:23 +0000 | [diff] [blame] | 645 | const FunctionArgList &Args, |
Adrian Prantl | 42d71b9 | 2014-04-10 23:21:53 +0000 | [diff] [blame] | 646 | SourceLocation Loc, |
Tilmann Scheller | 99cc30c | 2011-03-02 21:36:49 +0000 | [diff] [blame] | 647 | SourceLocation StartLoc) { |
David Blaikie | 8e6c36e | 2014-10-14 16:43:46 +0000 | [diff] [blame] | 648 | assert(!CurFn && |
| 649 | "Do not use a CodeGenFunction object for more than one function"); |
| 650 | |
Anders Carlsson | 73fcc95 | 2009-09-11 00:07:24 +0000 | [diff] [blame] | 651 | const Decl *D = GD.getDecl(); |
Michael Ilseman | 686240a | 2012-12-04 00:29:55 +0000 | [diff] [blame] | 652 | |
Anders Carlsson | f4478e9 | 2009-02-09 20:20:56 +0000 | [diff] [blame] | 653 | DidCallStackSave = false; |
John McCall | dec348f7 | 2013-05-03 07:33:41 +0000 | [diff] [blame] | 654 | CurCodeDecl = D; |
David Majnemer | 25eb165 | 2016-03-01 19:42:53 +0000 | [diff] [blame] | 655 | if (const auto *FD = dyn_cast_or_null<FunctionDecl>(D)) |
| 656 | if (FD->usesSEHTry()) |
| 657 | CurSEHParent = FD; |
Craig Topper | 8a13c41 | 2014-05-21 05:09:00 +0000 | [diff] [blame] | 658 | CurFuncDecl = (D ? D->getNonClosureContext() : nullptr); |
Daniel Dunbar | bc915f4 | 2008-09-09 23:14:03 +0000 | [diff] [blame] | 659 | FnRetTy = RetTy; |
Daniel Dunbar | 9c42652 | 2008-07-29 23:18:29 +0000 | [diff] [blame] | 660 | CurFn = Fn; |
John McCall | a738c25 | 2011-03-09 04:27:21 +0000 | [diff] [blame] | 661 | CurFnInfo = &FnInfo; |
Chris Lattner | 5696e7b | 2008-06-17 18:05:57 +0000 | [diff] [blame] | 662 | assert(CurFn->isDeclaration() && "Function already has body?"); |
| 663 | |
Vlad Tsyrklevich | 2eccdab | 2017-09-25 22:11:12 +0000 | [diff] [blame] | 664 | // If this function has been blacklisted for any of the enabled sanitizers, |
| 665 | // disable the sanitizer for the function. |
| 666 | do { |
| 667 | #define SANITIZER(NAME, ID) \ |
| 668 | if (SanOpts.empty()) \ |
| 669 | break; \ |
| 670 | if (SanOpts.has(SanitizerKind::ID)) \ |
| 671 | if (CGM.isInSanitizerBlacklist(SanitizerKind::ID, Fn, Loc)) \ |
| 672 | SanOpts.set(SanitizerKind::ID, false); |
| 673 | |
| 674 | #include "clang/Basic/Sanitizers.def" |
| 675 | #undef SANITIZER |
| 676 | } while (0); |
Will Dietz | f54319c | 2013-01-18 11:30:38 +0000 | [diff] [blame] | 677 | |
Peter Collingbourne | 915df99 | 2015-05-15 18:33:32 +0000 | [diff] [blame] | 678 | if (D) { |
| 679 | // Apply the no_sanitize* attributes to SanOpts. |
Vitaly Buka | 69a2e18 | 2018-04-09 20:10:29 +0000 | [diff] [blame] | 680 | for (auto Attr : D->specific_attrs<NoSanitizeAttr>()) { |
| 681 | SanitizerMask mask = Attr->getMask(); |
| 682 | SanOpts.Mask &= ~mask; |
| 683 | if (mask & SanitizerKind::Address) |
| 684 | SanOpts.set(SanitizerKind::KernelAddress, false); |
| 685 | if (mask & SanitizerKind::KernelAddress) |
| 686 | SanOpts.set(SanitizerKind::Address, false); |
Andrey Konovalov | 1ba9d9c | 2018-04-13 18:05:21 +0000 | [diff] [blame] | 687 | if (mask & SanitizerKind::HWAddress) |
| 688 | SanOpts.set(SanitizerKind::KernelHWAddress, false); |
| 689 | if (mask & SanitizerKind::KernelHWAddress) |
| 690 | SanOpts.set(SanitizerKind::HWAddress, false); |
Vitaly Buka | 69a2e18 | 2018-04-09 20:10:29 +0000 | [diff] [blame] | 691 | } |
Peter Collingbourne | 915df99 | 2015-05-15 18:33:32 +0000 | [diff] [blame] | 692 | } |
| 693 | |
| 694 | // Apply sanitizer attributes to the function. |
Alexander Potapenko | b9b73ef | 2015-06-19 12:19:07 +0000 | [diff] [blame] | 695 | if (SanOpts.hasOneOf(SanitizerKind::Address | SanitizerKind::KernelAddress)) |
Peter Collingbourne | 915df99 | 2015-05-15 18:33:32 +0000 | [diff] [blame] | 696 | Fn->addFnAttr(llvm::Attribute::SanitizeAddress); |
Andrey Konovalov | 1ba9d9c | 2018-04-13 18:05:21 +0000 | [diff] [blame] | 697 | if (SanOpts.hasOneOf(SanitizerKind::HWAddress | SanitizerKind::KernelHWAddress)) |
Evgeniy Stepanov | 12817e5 | 2017-12-09 01:32:07 +0000 | [diff] [blame] | 698 | Fn->addFnAttr(llvm::Attribute::SanitizeHWAddress); |
Peter Collingbourne | 915df99 | 2015-05-15 18:33:32 +0000 | [diff] [blame] | 699 | if (SanOpts.has(SanitizerKind::Thread)) |
| 700 | Fn->addFnAttr(llvm::Attribute::SanitizeThread); |
Alexander Potapenko | d49c32c | 2018-09-07 09:21:09 +0000 | [diff] [blame] | 701 | if (SanOpts.hasOneOf(SanitizerKind::Memory | SanitizerKind::KernelMemory)) |
Peter Collingbourne | 915df99 | 2015-05-15 18:33:32 +0000 | [diff] [blame] | 702 | Fn->addFnAttr(llvm::Attribute::SanitizeMemory); |
Peter Collingbourne | c4122c1 | 2015-06-15 21:08:13 +0000 | [diff] [blame] | 703 | if (SanOpts.has(SanitizerKind::SafeStack)) |
| 704 | Fn->addFnAttr(llvm::Attribute::SafeStack); |
Vlad Tsyrklevich | e55aa03 | 2018-04-03 22:33:53 +0000 | [diff] [blame] | 705 | if (SanOpts.has(SanitizerKind::ShadowCallStack)) |
| 706 | Fn->addFnAttr(llvm::Attribute::ShadowCallStack); |
Peter Collingbourne | 915df99 | 2015-05-15 18:33:32 +0000 | [diff] [blame] | 707 | |
Matt Morehouse | 5317f2e | 2018-03-23 23:35:28 +0000 | [diff] [blame] | 708 | // Apply fuzzing attribute to the function. |
| 709 | if (SanOpts.hasOneOf(SanitizerKind::Fuzzer | SanitizerKind::FuzzerNoLink)) |
| 710 | Fn->addFnAttr(llvm::Attribute::OptForFuzzing); |
| 711 | |
Anna Zaks | bcd35a8 | 2016-11-11 23:22:44 +0000 | [diff] [blame] | 712 | // Ignore TSan memory acesses from within ObjC/ObjC++ dealloc, initialize, |
Anna Zaks | e43b4fc | 2017-01-13 00:50:50 +0000 | [diff] [blame] | 713 | // .cxx_destruct, __destroy_helper_block_ and all of their calees at run time. |
Anna Zaks | bcd35a8 | 2016-11-11 23:22:44 +0000 | [diff] [blame] | 714 | if (SanOpts.has(SanitizerKind::Thread)) { |
| 715 | if (const auto *OMD = dyn_cast_or_null<ObjCMethodDecl>(D)) { |
| 716 | IdentifierInfo *II = OMD->getSelector().getIdentifierInfoForSlot(0); |
| 717 | if (OMD->getMethodFamily() == OMF_dealloc || |
| 718 | OMD->getMethodFamily() == OMF_initialize || |
| 719 | (OMD->getSelector().isUnarySelector() && II->isStr(".cxx_destruct"))) { |
Anna Zaks | e43b4fc | 2017-01-13 00:50:50 +0000 | [diff] [blame] | 720 | markAsIgnoreThreadCheckingAtRuntime(Fn); |
Anna Zaks | bcd35a8 | 2016-11-11 23:22:44 +0000 | [diff] [blame] | 721 | } |
| 722 | } |
| 723 | } |
| 724 | |
Vlad Tsyrklevich | 3f3aad2 | 2017-08-04 21:21:00 +0000 | [diff] [blame] | 725 | // Ignore unrelated casts in STL allocate() since the allocator must cast |
| 726 | // from void* to T* before object initialization completes. Don't match on the |
| 727 | // namespace because not all allocators are in std:: |
| 728 | if (D && SanOpts.has(SanitizerKind::CFIUnrelatedCast)) { |
| 729 | if (matchesStlAllocatorFn(D, getContext())) |
| 730 | SanOpts.Mask &= ~SanitizerKind::CFIUnrelatedCast; |
| 731 | } |
| 732 | |
Aaron Ballman | 7d2aecb | 2016-07-13 22:32:15 +0000 | [diff] [blame] | 733 | // Apply xray attributes to the function (as a string, for now) |
Dean Michael Berris | 05cf443 | 2018-09-14 01:59:12 +0000 | [diff] [blame] | 734 | if (D) { |
Aaron Ballman | 7d2aecb | 2016-07-13 22:32:15 +0000 | [diff] [blame] | 735 | if (const auto *XRayAttr = D->getAttr<XRayInstrumentAttr>()) { |
Dean Michael Berris | 05cf443 | 2018-09-14 01:59:12 +0000 | [diff] [blame] | 736 | if (CGM.getCodeGenOpts().XRayInstrumentationBundle.has( |
| 737 | XRayInstrKind::Function)) { |
| 738 | if (XRayAttr->alwaysXRayInstrument() && ShouldXRayInstrumentFunction()) |
| 739 | Fn->addFnAttr("function-instrument", "xray-always"); |
| 740 | if (XRayAttr->neverXRayInstrument()) |
| 741 | Fn->addFnAttr("function-instrument", "xray-never"); |
| 742 | if (const auto *LogArgs = D->getAttr<XRayLogArgsAttr>()) |
| 743 | if (ShouldXRayInstrumentFunction()) |
| 744 | Fn->addFnAttr("xray-log-args", |
| 745 | llvm::utostr(LogArgs->getArgumentCount())); |
Dean Michael Berris | 418da3f | 2017-03-06 07:08:21 +0000 | [diff] [blame] | 746 | } |
Aaron Ballman | 7d2aecb | 2016-07-13 22:32:15 +0000 | [diff] [blame] | 747 | } else { |
Dean Michael Berris | 05cf443 | 2018-09-14 01:59:12 +0000 | [diff] [blame] | 748 | if (ShouldXRayInstrumentFunction() && !CGM.imbueXRayAttrs(Fn, Loc)) |
Dean Michael Berris | 835832d | 2017-03-30 00:29:36 +0000 | [diff] [blame] | 749 | Fn->addFnAttr( |
| 750 | "xray-instruction-threshold", |
| 751 | llvm::itostr(CGM.getCodeGenOpts().XRayInstructionThreshold)); |
Aaron Ballman | 7d2aecb | 2016-07-13 22:32:15 +0000 | [diff] [blame] | 752 | } |
| 753 | } |
| 754 | |
Nirav Dave | d2f44d8 | 2016-04-05 17:50:43 +0000 | [diff] [blame] | 755 | // Add no-jump-tables value. |
| 756 | Fn->addFnAttr("no-jump-tables", |
| 757 | llvm::toStringRef(CGM.getCodeGenOpts().NoUseJumpTables)); |
| 758 | |
Dehao Chen | 5e97f23 | 2017-08-24 21:37:33 +0000 | [diff] [blame] | 759 | // Add profile-sample-accurate value. |
| 760 | if (CGM.getCodeGenOpts().ProfileSampleAccurate) |
| 761 | Fn->addFnAttr("profile-sample-accurate"); |
| 762 | |
Richard Smith | 9c6890a | 2012-11-01 22:30:59 +0000 | [diff] [blame] | 763 | if (getLangOpts().OpenCL) { |
Peter Collingbourne | 7ce13fc | 2011-02-14 01:42:53 +0000 | [diff] [blame] | 764 | // Add metadata for a kernel function. |
| 765 | if (const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(D)) |
Tanya Lattner | bcffcdf | 2012-07-09 22:06:01 +0000 | [diff] [blame] | 766 | EmitOpenCLKernelMetadata(FD, Fn); |
Peter Collingbourne | 7ce13fc | 2011-02-14 01:42:53 +0000 | [diff] [blame] | 767 | } |
| 768 | |
Peter Collingbourne | b453cd6 | 2013-10-20 21:29:19 +0000 | [diff] [blame] | 769 | // If we are checking function types, emit a function type signature as |
Peter Collingbourne | 1a0a9a3 | 2014-12-03 02:08:51 +0000 | [diff] [blame] | 770 | // prologue data. |
Alexey Samsonov | edf99a9 | 2014-11-07 22:29:38 +0000 | [diff] [blame] | 771 | if (getLangOpts().CPlusPlus && SanOpts.has(SanitizerKind::Function)) { |
Peter Collingbourne | b453cd6 | 2013-10-20 21:29:19 +0000 | [diff] [blame] | 772 | if (const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(D)) { |
Vedant Kumar | aa4ea5f | 2017-10-14 01:23:30 +0000 | [diff] [blame] | 773 | if (llvm::Constant *PrologueSig = getPrologueSignature(CGM, FD)) { |
Stephan Bergmann | 8c85bca | 2018-01-05 07:57:12 +0000 | [diff] [blame] | 774 | // Remove any (C++17) exception specifications, to allow calling e.g. a |
| 775 | // noexcept function through a non-noexcept pointer. |
| 776 | auto ProtoTy = |
| 777 | getContext().getFunctionTypeWithExceptionSpec(FD->getType(), |
| 778 | EST_None); |
Peter Collingbourne | b453cd6 | 2013-10-20 21:29:19 +0000 | [diff] [blame] | 779 | llvm::Constant *FTRTTIConst = |
Stephan Bergmann | 8c85bca | 2018-01-05 07:57:12 +0000 | [diff] [blame] | 780 | CGM.GetAddrOfRTTIDescriptor(ProtoTy, /*ForEH=*/true); |
Vedant Kumar | bb5d485 | 2017-09-13 00:04:35 +0000 | [diff] [blame] | 781 | llvm::Constant *FTRTTIConstEncoded = |
| 782 | EncodeAddrForUseInPrologue(Fn, FTRTTIConst); |
| 783 | llvm::Constant *PrologueStructElems[] = {PrologueSig, |
| 784 | FTRTTIConstEncoded}; |
Peter Collingbourne | 1a0a9a3 | 2014-12-03 02:08:51 +0000 | [diff] [blame] | 785 | llvm::Constant *PrologueStructConst = |
| 786 | llvm::ConstantStruct::getAnon(PrologueStructElems, /*Packed=*/true); |
| 787 | Fn->setPrologueData(PrologueStructConst); |
Peter Collingbourne | b453cd6 | 2013-10-20 21:29:19 +0000 | [diff] [blame] | 788 | } |
| 789 | } |
| 790 | } |
| 791 | |
Vedant Kumar | 42c17ec | 2017-03-14 01:56:34 +0000 | [diff] [blame] | 792 | // If we're checking nullability, we need to know whether we can check the |
| 793 | // return value. Initialize the flag to 'true' and refine it in EmitParmDecl. |
| 794 | if (SanOpts.has(SanitizerKind::NullabilityReturn)) { |
| 795 | auto Nullability = FnRetTy->getNullability(getContext()); |
| 796 | if (Nullability && *Nullability == NullabilityKind::NonNull) { |
| 797 | if (!(SanOpts.has(SanitizerKind::ReturnsNonnullAttribute) && |
| 798 | CurCodeDecl && CurCodeDecl->getAttr<ReturnsNonNullAttr>())) |
| 799 | RetValNullabilityPrecondition = |
| 800 | llvm::ConstantInt::getTrue(getLLVMContext()); |
| 801 | } |
| 802 | } |
| 803 | |
James Molloy | c16a60b6 | 2015-11-12 15:36:04 +0000 | [diff] [blame] | 804 | // If we're in C++ mode and the function name is "main", it is guaranteed |
| 805 | // to be norecurse by the standard (3.6.1.3 "The function main shall not be |
| 806 | // used within a program"). |
| 807 | if (getLangOpts().CPlusPlus) |
| 808 | if (const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(D)) |
| 809 | if (FD->isMain()) |
| 810 | Fn->addFnAttr(llvm::Attribute::NoRecurse); |
Honggyu Kim | 2bbdeac | 2016-09-01 06:14:45 +0000 | [diff] [blame] | 811 | |
Martin Storsjo | d39d53b | 2018-08-21 20:41:17 +0000 | [diff] [blame] | 812 | // If a custom alignment is used, force realigning to this alignment on |
| 813 | // any main function which certainly will need it. |
| 814 | if (const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(D)) |
| 815 | if ((FD->isMain() || FD->isMSVCRTEntryPoint()) && |
| 816 | CGM.getCodeGenOpts().StackAlignment) |
| 817 | Fn->addFnAttr("stackrealign"); |
| 818 | |
Daniel Dunbar | 75283ff | 2008-11-11 02:29:29 +0000 | [diff] [blame] | 819 | llvm::BasicBlock *EntryBB = createBasicBlock("entry", CurFn); |
Daniel Dunbar | 54bb193 | 2008-09-09 21:00:17 +0000 | [diff] [blame] | 820 | |
Chris Lattner | 5696e7b | 2008-06-17 18:05:57 +0000 | [diff] [blame] | 821 | // Create a marker to make it easy to insert allocas into the entryblock |
| 822 | // later. Don't create this with the builder, because we don't want it |
| 823 | // folded. |
Chris Lattner | 5e016ae | 2010-06-27 07:15:29 +0000 | [diff] [blame] | 824 | llvm::Value *Undef = llvm::UndefValue::get(Int32Ty); |
Mehdi Amini | 557c20a | 2016-03-13 21:05:23 +0000 | [diff] [blame] | 825 | AllocaInsertPt = new llvm::BitCastInst(Undef, Int32Ty, "allocapt", EntryBB); |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 826 | |
John McCall | bd30929 | 2010-07-06 01:34:17 +0000 | [diff] [blame] | 827 | ReturnBlock = getJumpDestInCurrentScope("return"); |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 828 | |
Chris Lattner | 5696e7b | 2008-06-17 18:05:57 +0000 | [diff] [blame] | 829 | Builder.SetInsertPoint(EntryBB); |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 830 | |
Vedant Kumar | c34d343 | 2017-06-23 21:32:38 +0000 | [diff] [blame] | 831 | // If we're checking the return value, allocate space for a pointer to a |
| 832 | // precise source location of the checked return statement. |
| 833 | if (requiresReturnValueCheck()) { |
| 834 | ReturnLocation = CreateDefaultAlignTempAlloca(Int8PtrTy, "return.sloc.ptr"); |
| 835 | InitTempAlloca(ReturnLocation, llvm::ConstantPointerNull::get(Int8PtrTy)); |
| 836 | } |
| 837 | |
Sanjiv Gupta | 1e8b608 | 2008-07-04 11:04:26 +0000 | [diff] [blame] | 838 | // Emit subprogram debug descriptor. |
Anders Carlsson | 63784f4 | 2009-02-13 08:11:52 +0000 | [diff] [blame] | 839 | if (CGDebugInfo *DI = getDebugInfo()) { |
Reid Kleckner | f00f803 | 2016-06-08 20:41:54 +0000 | [diff] [blame] | 840 | // Reconstruct the type from the argument list so that implicit parameters, |
| 841 | // such as 'this' and 'vtt', show up in the debug info. Preserve the calling |
| 842 | // convention. |
| 843 | CallingConv CC = CallingConv::CC_C; |
| 844 | if (auto *FD = dyn_cast_or_null<FunctionDecl>(D)) |
| 845 | if (const auto *SrcFnTy = FD->getType()->getAs<FunctionType>()) |
| 846 | CC = SrcFnTy->getCallConv(); |
Jordan Rose | 5c38272 | 2013-03-08 21:51:21 +0000 | [diff] [blame] | 847 | SmallVector<QualType, 16> ArgTypes; |
Reid Kleckner | f00f803 | 2016-06-08 20:41:54 +0000 | [diff] [blame] | 848 | for (const VarDecl *VD : Args) |
| 849 | ArgTypes.push_back(VD->getType()); |
| 850 | QualType FnType = getContext().getFunctionType( |
| 851 | RetTy, ArgTypes, FunctionProtoType::ExtProtoInfo(CC)); |
Brock Wyma | 94ece8f | 2018-04-16 16:53:57 +0000 | [diff] [blame] | 852 | DI->EmitFunctionStart(GD, Loc, StartLoc, FnType, CurFn, CurFuncIsThunk, |
| 853 | Builder); |
Sanjiv Gupta | 1e8b608 | 2008-07-04 11:04:26 +0000 | [diff] [blame] | 854 | } |
| 855 | |
Hans Wennborg | 76c26c1 | 2017-11-14 21:13:27 +0000 | [diff] [blame] | 856 | if (ShouldInstrumentFunction()) { |
Hans Wennborg | 14e8a5a | 2017-11-21 17:30:34 +0000 | [diff] [blame] | 857 | if (CGM.getCodeGenOpts().InstrumentFunctions) |
| 858 | CurFn->addFnAttr("instrument-function-entry", "__cyg_profile_func_enter"); |
| 859 | if (CGM.getCodeGenOpts().InstrumentFunctionsAfterInlining) |
| 860 | CurFn->addFnAttr("instrument-function-entry-inlined", |
| 861 | "__cyg_profile_func_enter"); |
| 862 | if (CGM.getCodeGenOpts().InstrumentFunctionEntryBare) |
| 863 | CurFn->addFnAttr("instrument-function-entry-inlined", |
| 864 | "__cyg_profile_func_enter_bare"); |
Hans Wennborg | 76c26c1 | 2017-11-14 21:13:27 +0000 | [diff] [blame] | 865 | } |
Chris Lattner | 3c77a35 | 2010-06-22 00:03:40 +0000 | [diff] [blame] | 866 | |
Honggyu Kim | 2b0e424 | 2016-09-01 11:29:21 +0000 | [diff] [blame] | 867 | // Since emitting the mcount call here impacts optimizations such as function |
| 868 | // inlining, we just add an attribute to insert a mcount call in backend. |
| 869 | // The attribute "counting-function" is set to mcount function name which is |
| 870 | // architecture dependent. |
Nirav Dave | 0c86ccf | 2017-01-31 17:00:35 +0000 | [diff] [blame] | 871 | if (CGM.getCodeGenOpts().InstrumentForProfiling) { |
Manoj Gupta | 886b450 | 2018-03-02 23:52:44 +0000 | [diff] [blame] | 872 | // Calls to fentry/mcount should not be generated if function has |
| 873 | // the no_instrument_function attribute. |
| 874 | if (!CurFuncDecl || !CurFuncDecl->hasAttr<NoInstrumentFunctionAttr>()) { |
| 875 | if (CGM.getCodeGenOpts().CallFEntry) |
| 876 | Fn->addFnAttr("fentry-call", "true"); |
| 877 | else { |
Hans Wennborg | 76c26c1 | 2017-11-14 21:13:27 +0000 | [diff] [blame] | 878 | Fn->addFnAttr("instrument-function-entry-inlined", |
| 879 | getTarget().getMCountName()); |
| 880 | } |
Manoj Gupta | 162b40a | 2017-06-19 18:45:03 +0000 | [diff] [blame] | 881 | } |
Nirav Dave | 0c86ccf | 2017-01-31 17:00:35 +0000 | [diff] [blame] | 882 | } |
Roman Divacky | 178e0160 | 2011-02-10 16:52:03 +0000 | [diff] [blame] | 883 | |
Eli Friedman | 4b1942c | 2009-12-04 02:43:40 +0000 | [diff] [blame] | 884 | if (RetTy->isVoidType()) { |
| 885 | // Void type; nothing to return. |
John McCall | 7f416cc | 2015-09-08 08:05:57 +0000 | [diff] [blame] | 886 | ReturnValue = Address::invalid(); |
Adrian Prantl | 2cede0f | 2014-04-29 01:07:59 +0000 | [diff] [blame] | 887 | |
| 888 | // Count the implicit return. |
| 889 | if (!endsWithReturn(D)) |
| 890 | ++NumReturnExprs; |
Hans Wennborg | 86aba5e | 2018-12-07 08:17:26 +0000 | [diff] [blame] | 891 | } else if (CurFnInfo->getReturnInfo().getKind() == ABIArgInfo::Indirect) { |
| 892 | // Indirect return; emit returned value directly into sret slot. |
Daniel Dunbar | fd09df7 | 2010-02-16 19:45:20 +0000 | [diff] [blame] | 893 | // This reduces code size, and affects correctness in C++. |
Reid Kleckner | 37abaca | 2014-05-09 22:46:15 +0000 | [diff] [blame] | 894 | auto AI = CurFn->arg_begin(); |
| 895 | if (CurFnInfo->getReturnInfo().isSRetAfterThis()) |
| 896 | ++AI; |
Duncan P. N. Exon Smith | 9f5260a | 2015-11-06 23:00:41 +0000 | [diff] [blame] | 897 | ReturnValue = Address(&*AI, CurFnInfo->getReturnInfo().getIndirectAlign()); |
Amy Huang | 7fac5c8 | 2019-06-20 17:15:21 +0000 | [diff] [blame] | 898 | if (!CurFnInfo->getReturnInfo().getIndirectByVal()) { |
| 899 | ReturnValuePointer = |
| 900 | CreateDefaultAlignTempAlloca(Int8PtrTy, "result.ptr"); |
| 901 | Builder.CreateStore(Builder.CreatePointerBitCastOrAddrSpaceCast( |
| 902 | ReturnValue.getPointer(), Int8PtrTy), |
| 903 | ReturnValuePointer); |
| 904 | } |
Reid Kleckner | 314ef7b | 2014-02-01 00:04:45 +0000 | [diff] [blame] | 905 | } else if (CurFnInfo->getReturnInfo().getKind() == ABIArgInfo::InAlloca && |
| 906 | !hasScalarEvaluationKind(CurFnInfo->getReturnType())) { |
| 907 | // Load the sret pointer from the argument struct and return into that. |
| 908 | unsigned Idx = CurFnInfo->getReturnInfo().getInAllocaFieldIndex(); |
| 909 | llvm::Function::arg_iterator EI = CurFn->arg_end(); |
| 910 | --EI; |
Duncan P. N. Exon Smith | 9f5260a | 2015-11-06 23:00:41 +0000 | [diff] [blame] | 911 | llvm::Value *Addr = Builder.CreateStructGEP(nullptr, &*EI, Idx); |
Amy Huang | 7fac5c8 | 2019-06-20 17:15:21 +0000 | [diff] [blame] | 912 | ReturnValuePointer = Address(Addr, getPointerAlign()); |
John McCall | 7f416cc | 2015-09-08 08:05:57 +0000 | [diff] [blame] | 913 | Addr = Builder.CreateAlignedLoad(Addr, getPointerAlign(), "agg.result"); |
| 914 | ReturnValue = Address(Addr, getNaturalTypeAlignment(RetTy)); |
Eli Friedman | 4b1942c | 2009-12-04 02:43:40 +0000 | [diff] [blame] | 915 | } else { |
Daniel Dunbar | fd09df7 | 2010-02-16 19:45:20 +0000 | [diff] [blame] | 916 | ReturnValue = CreateIRTemp(RetTy, "retval"); |
John McCall | 31168b0 | 2011-06-15 23:02:42 +0000 | [diff] [blame] | 917 | |
| 918 | // Tell the epilog emitter to autorelease the result. We do this |
| 919 | // now so that various specialized functions can suppress it |
| 920 | // during their IR-generation. |
David Blaikie | bbafb8a | 2012-03-11 07:00:24 +0000 | [diff] [blame] | 921 | if (getLangOpts().ObjCAutoRefCount && |
John McCall | 31168b0 | 2011-06-15 23:02:42 +0000 | [diff] [blame] | 922 | !CurFnInfo->isReturnsRetained() && |
| 923 | RetTy->isObjCRetainableType()) |
| 924 | AutoreleaseResult = true; |
Eli Friedman | 4b1942c | 2009-12-04 02:43:40 +0000 | [diff] [blame] | 925 | } |
| 926 | |
Mike Stump | 1d84921 | 2009-12-07 23:38:24 +0000 | [diff] [blame] | 927 | EmitStartEHSpec(CurCodeDecl); |
John McCall | 31168b0 | 2011-06-15 23:02:42 +0000 | [diff] [blame] | 928 | |
| 929 | PrologueCleanupDepth = EHStack.stable_begin(); |
Gheorghe-Teodor Bercea | d3dcf2f | 2018-03-14 14:17:45 +0000 | [diff] [blame] | 930 | |
| 931 | // Emit OpenMP specific initialization of the device functions. |
| 932 | if (getLangOpts().OpenMP && CurCodeDecl) |
| 933 | CGM.getOpenMPRuntime().emitFunctionProlog(*this, CurCodeDecl); |
| 934 | |
Daniel Dunbar | d931a87 | 2009-02-02 22:03:45 +0000 | [diff] [blame] | 935 | EmitFunctionProlog(*CurFnInfo, CurFn, Args); |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 936 | |
Eli Friedman | 9fbeba0 | 2012-02-11 02:57:39 +0000 | [diff] [blame] | 937 | if (D && isa<CXXMethodDecl>(D) && cast<CXXMethodDecl>(D)->isInstance()) { |
John McCall | 5d865c32 | 2010-08-31 07:33:07 +0000 | [diff] [blame] | 938 | CGM.getCXXABI().EmitInstanceFunctionProlog(*this); |
Eli Friedman | 9fbeba0 | 2012-02-11 02:57:39 +0000 | [diff] [blame] | 939 | const CXXMethodDecl *MD = cast<CXXMethodDecl>(D); |
| 940 | if (MD->getParent()->isLambda() && |
| 941 | MD->getOverloadedOperator() == OO_Call) { |
| 942 | // We're in a lambda; figure out the captures. |
| 943 | MD->getParent()->getCaptureFields(LambdaCaptureFields, |
| 944 | LambdaThisCaptureField); |
| 945 | if (LambdaThisCaptureField) { |
Faisal Vali | dc6b596 | 2016-03-21 09:25:37 +0000 | [diff] [blame] | 946 | // If the lambda captures the object referred to by '*this' - either by |
| 947 | // value or by reference, make sure CXXThisValue points to the correct |
| 948 | // object. |
| 949 | |
| 950 | // Get the lvalue for the field (which is a copy of the enclosing object |
| 951 | // or contains the address of the enclosing object). |
| 952 | LValue ThisFieldLValue = EmitLValueForLambdaField(LambdaThisCaptureField); |
| 953 | if (!LambdaThisCaptureField->getType()->isPointerType()) { |
| 954 | // If the enclosing object was captured by value, just use its address. |
| 955 | CXXThisValue = ThisFieldLValue.getAddress().getPointer(); |
| 956 | } else { |
| 957 | // Load the lvalue pointed to by the field, since '*this' was captured |
| 958 | // by reference. |
| 959 | CXXThisValue = |
| 960 | EmitLoadOfLValue(ThisFieldLValue, SourceLocation()).getScalarVal(); |
| 961 | } |
Eli Friedman | 9fbeba0 | 2012-02-11 02:57:39 +0000 | [diff] [blame] | 962 | } |
Alexey Bataev | 39c81e2 | 2014-08-28 04:28:19 +0000 | [diff] [blame] | 963 | for (auto *FD : MD->getParent()->fields()) { |
| 964 | if (FD->hasCapturedVLAType()) { |
| 965 | auto *ExprArg = EmitLoadOfLValue(EmitLValueForLambdaField(FD), |
| 966 | SourceLocation()).getScalarVal(); |
| 967 | auto VAT = FD->getCapturedVLAType(); |
| 968 | VLASizeMap[VAT->getSizeExpr()] = ExprArg; |
| 969 | } |
| 970 | } |
Eli Friedman | 9fbeba0 | 2012-02-11 02:57:39 +0000 | [diff] [blame] | 971 | } else { |
| 972 | // Not in a lambda; just use 'this' from the method. |
| 973 | // FIXME: Should we generate a new load for each use of 'this'? The |
| 974 | // fast register allocator would be happier... |
| 975 | CXXThisValue = CXXABIThisValue; |
| 976 | } |
Vedant Kumar | 34b1fd6 | 2017-02-17 23:22:59 +0000 | [diff] [blame] | 977 | |
Vedant Kumar | ffd7c88 | 2017-04-14 22:03:34 +0000 | [diff] [blame] | 978 | // Check the 'this' pointer once per function, if it's available. |
Richard Smith | 376c28e | 2017-08-24 20:10:33 +0000 | [diff] [blame] | 979 | if (CXXABIThisValue) { |
Vedant Kumar | 34b1fd6 | 2017-02-17 23:22:59 +0000 | [diff] [blame] | 980 | SanitizerSet SkippedChecks; |
Vedant Kumar | 34b1fd6 | 2017-02-17 23:22:59 +0000 | [diff] [blame] | 981 | SkippedChecks.set(SanitizerKind::ObjectSize, true); |
Brian Gesiak | 5488ab4 | 2019-01-11 01:54:53 +0000 | [diff] [blame] | 982 | QualType ThisTy = MD->getThisType(); |
Richard Smith | 376c28e | 2017-08-24 20:10:33 +0000 | [diff] [blame] | 983 | |
| 984 | // If this is the call operator of a lambda with no capture-default, it |
| 985 | // may have a static invoker function, which may call this operator with |
| 986 | // a null 'this' pointer. |
| 987 | if (isLambdaCallOperator(MD) && |
George Burgess IV | 00f70bd | 2018-03-01 05:43:23 +0000 | [diff] [blame] | 988 | MD->getParent()->getLambdaCaptureDefault() == LCD_None) |
Richard Smith | 376c28e | 2017-08-24 20:10:33 +0000 | [diff] [blame] | 989 | SkippedChecks.set(SanitizerKind::Null, true); |
| 990 | |
| 991 | EmitTypeCheck(isa<CXXConstructorDecl>(MD) ? TCK_ConstructorCall |
| 992 | : TCK_MemberCall, |
| 993 | Loc, CXXABIThisValue, ThisTy, |
Vedant Kumar | ffd7c88 | 2017-04-14 22:03:34 +0000 | [diff] [blame] | 994 | getContext().getTypeAlignInChars(ThisTy->getPointeeType()), |
| 995 | SkippedChecks); |
Vedant Kumar | 34b1fd6 | 2017-02-17 23:22:59 +0000 | [diff] [blame] | 996 | } |
Eli Friedman | 9fbeba0 | 2012-02-11 02:57:39 +0000 | [diff] [blame] | 997 | } |
John McCall | 347132b | 2010-02-16 22:04:33 +0000 | [diff] [blame] | 998 | |
Anders Carlsson | c20879a | 2008-12-20 21:28:43 +0000 | [diff] [blame] | 999 | // If any of the arguments have a variably modified type, make sure to |
| 1000 | // emit the type size. |
| 1001 | for (FunctionArgList::const_iterator i = Args.begin(), e = Args.end(); |
| 1002 | i != e; ++i) { |
Eli Friedman | 1f57683 | 2012-11-14 22:09:59 +0000 | [diff] [blame] | 1003 | const VarDecl *VD = *i; |
| 1004 | |
| 1005 | // Dig out the type as written from ParmVarDecls; it's unclear whether |
| 1006 | // the standard (C99 6.9.1p10) requires this, but we're following the |
| 1007 | // precedent set by gcc. |
| 1008 | QualType Ty; |
| 1009 | if (const ParmVarDecl *PVD = dyn_cast<ParmVarDecl>(VD)) |
| 1010 | Ty = PVD->getOriginalType(); |
| 1011 | else |
| 1012 | Ty = VD->getType(); |
Anders Carlsson | c20879a | 2008-12-20 21:28:43 +0000 | [diff] [blame] | 1013 | |
| 1014 | if (Ty->isVariablyModifiedType()) |
John McCall | 23c29fe | 2011-06-24 21:55:10 +0000 | [diff] [blame] | 1015 | EmitVariablyModifiedType(Ty); |
Anders Carlsson | c20879a | 2008-12-20 21:28:43 +0000 | [diff] [blame] | 1016 | } |
Eric Christopher | 7cdf948 | 2011-10-13 21:45:18 +0000 | [diff] [blame] | 1017 | // Emit a location at the end of the prologue. |
| 1018 | if (CGDebugInfo *DI = getDebugInfo()) |
Calixte Denizet | fcd661d | 2018-09-24 18:24:18 +0000 | [diff] [blame] | 1019 | DI->EmitLocation(Builder, StartLoc); |
Craig Topper | 74c10e3 | 2018-07-09 19:00:16 +0000 | [diff] [blame] | 1020 | |
| 1021 | // TODO: Do we need to handle this in two places like we do with |
| 1022 | // target-features/target-cpu? |
| 1023 | if (CurFuncDecl) |
| 1024 | if (const auto *VecWidth = CurFuncDecl->getAttr<MinVectorWidthAttr>()) |
| 1025 | LargestVectorWidth = VecWidth->getVectorWidth(); |
Daniel Dunbar | bc915f4 | 2008-09-09 23:14:03 +0000 | [diff] [blame] | 1026 | } |
Eli Friedman | 3d421e1 | 2008-08-25 21:31:01 +0000 | [diff] [blame] | 1027 | |
Reid Kleckner | 4307108 | 2018-12-13 01:33:20 +0000 | [diff] [blame] | 1028 | void CodeGenFunction::EmitFunctionBody(const Stmt *Body) { |
Justin Bogner | 66242d6 | 2015-04-23 23:06:47 +0000 | [diff] [blame] | 1029 | incrementProfileCounter(Body); |
Richard Smith | b47c36f | 2013-11-05 09:12:18 +0000 | [diff] [blame] | 1030 | if (const CompoundStmt *S = dyn_cast<CompoundStmt>(Body)) |
David Blaikie | 0a21d0d | 2013-01-26 22:16:26 +0000 | [diff] [blame] | 1031 | EmitCompoundStmtWithoutScope(*S); |
| 1032 | else |
Richard Smith | b47c36f | 2013-11-05 09:12:18 +0000 | [diff] [blame] | 1033 | EmitStmt(Body); |
John McCall | 89b12b3 | 2010-02-18 03:17:58 +0000 | [diff] [blame] | 1034 | } |
| 1035 | |
Bob Wilson | bf854f0 | 2014-02-17 19:21:09 +0000 | [diff] [blame] | 1036 | /// When instrumenting to collect profile data, the counts for some blocks |
| 1037 | /// such as switch cases need to not include the fall-through counts, so |
| 1038 | /// emit a branch around the instrumentation code. When not instrumenting, |
| 1039 | /// this just calls EmitBlock(). |
| 1040 | void CodeGenFunction::EmitBlockWithFallThrough(llvm::BasicBlock *BB, |
Justin Bogner | 66242d6 | 2015-04-23 23:06:47 +0000 | [diff] [blame] | 1041 | const Stmt *S) { |
Craig Topper | 8a13c41 | 2014-05-21 05:09:00 +0000 | [diff] [blame] | 1042 | llvm::BasicBlock *SkipCountBB = nullptr; |
Rong Xu | 9837ef5 | 2016-02-04 18:39:09 +0000 | [diff] [blame] | 1043 | if (HaveInsertPoint() && CGM.getCodeGenOpts().hasProfileClangInstr()) { |
Bob Wilson | bf854f0 | 2014-02-17 19:21:09 +0000 | [diff] [blame] | 1044 | // When instrumenting for profiling, the fallthrough to certain |
| 1045 | // statements needs to skip over the instrumentation code so that we |
| 1046 | // get an accurate count. |
| 1047 | SkipCountBB = createBasicBlock("skipcount"); |
| 1048 | EmitBranch(SkipCountBB); |
| 1049 | } |
| 1050 | EmitBlock(BB); |
Justin Bogner | 66242d6 | 2015-04-23 23:06:47 +0000 | [diff] [blame] | 1051 | uint64_t CurrentCount = getCurrentProfileCount(); |
| 1052 | incrementProfileCounter(S); |
| 1053 | setCurrentProfileCount(getCurrentProfileCount() + CurrentCount); |
Bob Wilson | bf854f0 | 2014-02-17 19:21:09 +0000 | [diff] [blame] | 1054 | if (SkipCountBB) |
| 1055 | EmitBlock(SkipCountBB); |
| 1056 | } |
| 1057 | |
John McCall | 8601a75 | 2010-08-03 22:46:07 +0000 | [diff] [blame] | 1058 | /// Tries to mark the given function nounwind based on the |
| 1059 | /// non-existence of any throwing calls within it. We believe this is |
| 1060 | /// lightweight enough to do at -O0. |
| 1061 | static void TryMarkNoThrow(llvm::Function *F) { |
John McCall | 5996699 | 2010-08-11 22:38:33 +0000 | [diff] [blame] | 1062 | // LLVM treats 'nounwind' on a function as part of the type, so we |
| 1063 | // can't do this on functions that can be overwritten. |
Sanjoy Das | f60a0d7 | 2016-04-08 01:31:02 +0000 | [diff] [blame] | 1064 | if (F->isInterposable()) return; |
John McCall | 5996699 | 2010-08-11 22:38:33 +0000 | [diff] [blame] | 1065 | |
David Majnemer | dbf1045 | 2015-07-31 17:58:45 +0000 | [diff] [blame] | 1066 | for (llvm::BasicBlock &BB : *F) |
| 1067 | for (llvm::Instruction &I : BB) |
| 1068 | if (I.mayThrow()) |
Bill Wendling | f0724e8 | 2011-09-19 20:31:14 +0000 | [diff] [blame] | 1069 | return; |
David Majnemer | dbf1045 | 2015-07-31 17:58:45 +0000 | [diff] [blame] | 1070 | |
Bill Wendling | 73e465e | 2012-10-10 03:13:20 +0000 | [diff] [blame] | 1071 | F->setDoesNotThrow(); |
John McCall | 8601a75 | 2010-08-03 22:46:07 +0000 | [diff] [blame] | 1072 | } |
| 1073 | |
Richard Smith | 5179eb7 | 2016-06-28 19:03:57 +0000 | [diff] [blame] | 1074 | QualType CodeGenFunction::BuildFunctionArgList(GlobalDecl GD, |
| 1075 | FunctionArgList &Args) { |
Anders Carlsson | 73fcc95 | 2009-09-11 00:07:24 +0000 | [diff] [blame] | 1076 | const FunctionDecl *FD = cast<FunctionDecl>(GD.getDecl()); |
Alp Toker | 314cc81 | 2014-01-25 16:55:45 +0000 | [diff] [blame] | 1077 | QualType ResTy = FD->getReturnType(); |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1078 | |
Reid Kleckner | 89077a1 | 2013-12-17 19:46:40 +0000 | [diff] [blame] | 1079 | const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD); |
| 1080 | if (MD && MD->isInstance()) { |
Stephen Lin | 9dc6eef | 2013-06-30 20:40:16 +0000 | [diff] [blame] | 1081 | if (CGM.getCXXABI().HasThisReturn(GD)) |
Brian Gesiak | 5488ab4 | 2019-01-11 01:54:53 +0000 | [diff] [blame] | 1082 | ResTy = MD->getThisType(); |
David Majnemer | 0c0b6d9 | 2014-10-31 20:09:12 +0000 | [diff] [blame] | 1083 | else if (CGM.getCXXABI().hasMostDerivedReturn(GD)) |
| 1084 | ResTy = CGM.getContext().VoidPtrTy; |
Reid Kleckner | 89077a1 | 2013-12-17 19:46:40 +0000 | [diff] [blame] | 1085 | CGM.getCXXABI().buildThisParam(*this, Args); |
Stephen Lin | 9dc6eef | 2013-06-30 20:40:16 +0000 | [diff] [blame] | 1086 | } |
Justin Bogner | 66242d6 | 2015-04-23 23:06:47 +0000 | [diff] [blame] | 1087 | |
Richard Smith | 5179eb7 | 2016-06-28 19:03:57 +0000 | [diff] [blame] | 1088 | // The base version of an inheriting constructor whose constructed base is a |
| 1089 | // virtual base is not passed any arguments (because it doesn't actually call |
| 1090 | // the inherited constructor). |
| 1091 | bool PassedParams = true; |
| 1092 | if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(FD)) |
| 1093 | if (auto Inherited = CD->getInheritedConstructor()) |
| 1094 | PassedParams = |
| 1095 | getTypes().inheritingCtorHasParams(Inherited, GD.getCtorType()); |
George Burgess IV | 3e3bb95b | 2015-12-02 21:58:08 +0000 | [diff] [blame] | 1096 | |
Richard Smith | 5179eb7 | 2016-06-28 19:03:57 +0000 | [diff] [blame] | 1097 | if (PassedParams) { |
| 1098 | for (auto *Param : FD->parameters()) { |
| 1099 | Args.push_back(Param); |
| 1100 | if (!Param->hasAttr<PassObjectSizeAttr>()) |
| 1101 | continue; |
| 1102 | |
Richard Smith | 5179eb7 | 2016-06-28 19:03:57 +0000 | [diff] [blame] | 1103 | auto *Implicit = ImplicitParamDecl::Create( |
Alexey Bataev | 5622323 | 2017-06-09 13:40:18 +0000 | [diff] [blame] | 1104 | getContext(), Param->getDeclContext(), Param->getLocation(), |
| 1105 | /*Id=*/nullptr, getContext().getSizeType(), ImplicitParamDecl::Other); |
Richard Smith | 5179eb7 | 2016-06-28 19:03:57 +0000 | [diff] [blame] | 1106 | SizeArguments[Param] = Implicit; |
| 1107 | Args.push_back(Implicit); |
| 1108 | } |
George Burgess IV | 3e3bb95b | 2015-12-02 21:58:08 +0000 | [diff] [blame] | 1109 | } |
Daniel Dunbar | 89654ee | 2008-08-26 08:29:31 +0000 | [diff] [blame] | 1110 | |
Reid Kleckner | 89077a1 | 2013-12-17 19:46:40 +0000 | [diff] [blame] | 1111 | if (MD && (isa<CXXConstructorDecl>(MD) || isa<CXXDestructorDecl>(MD))) |
| 1112 | CGM.getCXXABI().addImplicitStructorParams(*this, ResTy, Args); |
| 1113 | |
Richard Smith | 5179eb7 | 2016-06-28 19:03:57 +0000 | [diff] [blame] | 1114 | return ResTy; |
| 1115 | } |
| 1116 | |
Alex Lorenz | c1608f7 | 2017-01-04 13:40:34 +0000 | [diff] [blame] | 1117 | static bool |
| 1118 | shouldUseUndefinedBehaviorReturnOptimization(const FunctionDecl *FD, |
| 1119 | const ASTContext &Context) { |
| 1120 | QualType T = FD->getReturnType(); |
| 1121 | // Avoid the optimization for functions that return a record type with a |
| 1122 | // trivial destructor or another trivially copyable type. |
| 1123 | if (const RecordType *RT = T.getCanonicalType()->getAs<RecordType>()) { |
| 1124 | if (const auto *ClassDecl = dyn_cast<CXXRecordDecl>(RT->getDecl())) |
| 1125 | return !ClassDecl->hasTrivialDestructor(); |
| 1126 | } |
| 1127 | return !T.isTriviallyCopyableType(Context); |
| 1128 | } |
| 1129 | |
Richard Smith | 5179eb7 | 2016-06-28 19:03:57 +0000 | [diff] [blame] | 1130 | void CodeGenFunction::GenerateCode(GlobalDecl GD, llvm::Function *Fn, |
| 1131 | const CGFunctionInfo &FnInfo) { |
| 1132 | const FunctionDecl *FD = cast<FunctionDecl>(GD.getDecl()); |
| 1133 | CurGD = GD; |
| 1134 | |
| 1135 | FunctionArgList Args; |
| 1136 | QualType ResTy = BuildFunctionArgList(GD, Args); |
| 1137 | |
| 1138 | // Check if we should generate debug info for this function. |
| 1139 | if (FD->hasAttr<NoDebugAttr>()) |
| 1140 | DebugInfo = nullptr; // disable debug info indefinitely for this function |
| 1141 | |
Reid Kleckner | a858981 | 2017-02-08 16:09:32 +0000 | [diff] [blame] | 1142 | // The function might not have a body if we're generating thunks for a |
| 1143 | // function declaration. |
John McCall | 89b12b3 | 2010-02-18 03:17:58 +0000 | [diff] [blame] | 1144 | SourceRange BodyRange; |
Reid Kleckner | a858981 | 2017-02-08 16:09:32 +0000 | [diff] [blame] | 1145 | if (Stmt *Body = FD->getBody()) |
| 1146 | BodyRange = Body->getSourceRange(); |
| 1147 | else |
| 1148 | BodyRange = FD->getLocation(); |
Adrian Prantl | dc237b5 | 2013-05-16 00:41:26 +0000 | [diff] [blame] | 1149 | CurEHLocation = BodyRange.getEnd(); |
Anders Carlsson | 438cf92 | 2009-11-06 02:55:43 +0000 | [diff] [blame] | 1150 | |
Adrian Prantl | 42d71b9 | 2014-04-10 23:21:53 +0000 | [diff] [blame] | 1151 | // Use the location of the start of the function to determine where |
| 1152 | // the function definition is located. By default use the location |
| 1153 | // of the declaration as the location for the subprogram. A function |
| 1154 | // may lack a declaration in the source code if it is created by code |
| 1155 | // gen. (examples: _GLOBAL__I_a, __cxx_global_array_dtor, thunk). |
Alexey Samsonov | cb1ad6f | 2014-07-08 20:23:18 +0000 | [diff] [blame] | 1156 | SourceLocation Loc = FD->getLocation(); |
Adrian Prantl | 42d71b9 | 2014-04-10 23:21:53 +0000 | [diff] [blame] | 1157 | |
Alexey Samsonov | cb1ad6f | 2014-07-08 20:23:18 +0000 | [diff] [blame] | 1158 | // If this is a function specialization then use the pattern body |
| 1159 | // as the location for the function. |
| 1160 | if (const FunctionDecl *SpecDecl = FD->getTemplateInstantiationPattern()) |
| 1161 | if (SpecDecl->hasBody(SpecDecl)) |
| 1162 | Loc = SpecDecl->getLocation(); |
Adrian Prantl | 42d71b9 | 2014-04-10 23:21:53 +0000 | [diff] [blame] | 1163 | |
Vitaly Buka | 64c80b4 | 2016-10-26 05:42:30 +0000 | [diff] [blame] | 1164 | Stmt *Body = FD->getBody(); |
| 1165 | |
| 1166 | // Initialize helper which will detect jumps which can cause invalid lifetime |
| 1167 | // markers. |
| 1168 | if (Body && ShouldEmitLifetimeMarkers) |
| 1169 | Bypasses.Init(Body); |
| 1170 | |
John McCall | 89b12b3 | 2010-02-18 03:17:58 +0000 | [diff] [blame] | 1171 | // Emit the standard function prologue. |
Adrian Prantl | 42d71b9 | 2014-04-10 23:21:53 +0000 | [diff] [blame] | 1172 | StartFunction(GD, ResTy, Fn, FnInfo, Args, Loc, BodyRange.getBegin()); |
Anders Carlsson | 438cf92 | 2009-11-06 02:55:43 +0000 | [diff] [blame] | 1173 | |
John McCall | 89b12b3 | 2010-02-18 03:17:58 +0000 | [diff] [blame] | 1174 | // Generate the body of the function. |
Serge Pavlov | 3a56145 | 2015-12-06 14:32:39 +0000 | [diff] [blame] | 1175 | PGO.assignRegionCounters(GD, CurFn); |
John McCall | b81884d | 2010-02-19 09:25:03 +0000 | [diff] [blame] | 1176 | if (isa<CXXDestructorDecl>(FD)) |
| 1177 | EmitDestructorBody(Args); |
| 1178 | else if (isa<CXXConstructorDecl>(FD)) |
| 1179 | EmitConstructorBody(Args); |
Richard Smith | 9c6890a | 2012-11-01 22:30:59 +0000 | [diff] [blame] | 1180 | else if (getLangOpts().CUDA && |
Artem Belevich | f3d3db6 | 2015-03-19 18:58:18 +0000 | [diff] [blame] | 1181 | !getLangOpts().CUDAIsDevice && |
Peter Collingbourne | fa4d603 | 2011-10-06 18:51:56 +0000 | [diff] [blame] | 1182 | FD->hasAttr<CUDAGlobalAttr>()) |
Artem Belevich | 52cc487 | 2015-05-07 19:34:16 +0000 | [diff] [blame] | 1183 | CGM.getCUDARuntime().emitDeviceStub(*this, Args); |
Reid Kleckner | 2d3c421 | 2017-08-04 22:38:06 +0000 | [diff] [blame] | 1184 | else if (isa<CXXMethodDecl>(FD) && |
| 1185 | cast<CXXMethodDecl>(FD)->isLambdaStaticInvoker()) { |
Faisal Vali | 2b391ab | 2013-09-26 19:54:12 +0000 | [diff] [blame] | 1186 | // The lambda static invoker function is special, because it forwards or |
Douglas Gregor | 355efbb | 2012-02-17 03:02:34 +0000 | [diff] [blame] | 1187 | // clones the body of the function call operator (but is actually static). |
Reid Kleckner | 2d3c421 | 2017-08-04 22:38:06 +0000 | [diff] [blame] | 1188 | EmitLambdaStaticInvokeBody(cast<CXXMethodDecl>(FD)); |
Lang Hames | bf12274 | 2013-02-17 07:22:09 +0000 | [diff] [blame] | 1189 | } else if (FD->isDefaulted() && isa<CXXMethodDecl>(FD) && |
Nick Lewycky | b39be1f | 2013-09-10 05:14:39 +0000 | [diff] [blame] | 1190 | (cast<CXXMethodDecl>(FD)->isCopyAssignmentOperator() || |
| 1191 | cast<CXXMethodDecl>(FD)->isMoveAssignmentOperator())) { |
Lang Hames | bf12274 | 2013-02-17 07:22:09 +0000 | [diff] [blame] | 1192 | // Implicit copy-assignment gets the same special treatment as implicit |
| 1193 | // copy-constructors. |
| 1194 | emitImplicitAssignmentOperatorBody(Args); |
Vitaly Buka | 64c80b4 | 2016-10-26 05:42:30 +0000 | [diff] [blame] | 1195 | } else if (Body) { |
Reid Kleckner | 4307108 | 2018-12-13 01:33:20 +0000 | [diff] [blame] | 1196 | EmitFunctionBody(Body); |
Richard Smith | b47c36f | 2013-11-05 09:12:18 +0000 | [diff] [blame] | 1197 | } else |
| 1198 | llvm_unreachable("no definition for emitted function"); |
Anders Carlsson | ff8cce4 | 2010-02-07 19:45:40 +0000 | [diff] [blame] | 1199 | |
Richard Smith | 9f9e582 | 2012-10-04 23:52:29 +0000 | [diff] [blame] | 1200 | // C++11 [stmt.return]p2: |
| 1201 | // Flowing off the end of a function [...] results in undefined behavior in |
| 1202 | // a value-returning function. |
| 1203 | // C11 6.9.1p12: |
| 1204 | // If the '}' that terminates a function is reached, and the value of the |
| 1205 | // function call is used by the caller, the behavior is undefined. |
Reid Kleckner | 9b3e3df | 2014-09-04 20:04:38 +0000 | [diff] [blame] | 1206 | if (getLangOpts().CPlusPlus && !FD->hasImplicitReturnZero() && !SawAsmBlock && |
Alp Toker | 314cc81 | 2014-01-25 16:55:45 +0000 | [diff] [blame] | 1207 | !FD->getReturnType()->isVoidType() && Builder.GetInsertBlock()) { |
Alex Lorenz | c1608f7 | 2017-01-04 13:40:34 +0000 | [diff] [blame] | 1208 | bool ShouldEmitUnreachable = |
| 1209 | CGM.getCodeGenOpts().StrictReturn || |
| 1210 | shouldUseUndefinedBehaviorReturnOptimization(FD, getContext()); |
Alexey Samsonov | edf99a9 | 2014-11-07 22:29:38 +0000 | [diff] [blame] | 1211 | if (SanOpts.has(SanitizerKind::Return)) { |
Alexey Samsonov | 24cad99 | 2014-07-17 18:46:27 +0000 | [diff] [blame] | 1212 | SanitizerScope SanScope(this); |
Alexey Samsonov | e396bfc | 2014-11-11 22:03:54 +0000 | [diff] [blame] | 1213 | llvm::Value *IsFalse = Builder.getFalse(); |
| 1214 | EmitCheck(std::make_pair(IsFalse, SanitizerKind::Return), |
Filipe Cabecinhas | 322ecd9 | 2016-12-12 16:18:40 +0000 | [diff] [blame] | 1215 | SanitizerHandler::MissingReturn, |
| 1216 | EmitCheckSourceLocation(FD->getLocation()), None); |
Alex Lorenz | c1608f7 | 2017-01-04 13:40:34 +0000 | [diff] [blame] | 1217 | } else if (ShouldEmitUnreachable) { |
| 1218 | if (CGM.getCodeGenOpts().OptimizationLevel == 0) |
| 1219 | EmitTrapCall(llvm::Intrinsic::trap); |
Akira Hatanaka | 85365cd | 2015-07-02 22:15:41 +0000 | [diff] [blame] | 1220 | } |
Alex Lorenz | c1608f7 | 2017-01-04 13:40:34 +0000 | [diff] [blame] | 1221 | if (SanOpts.has(SanitizerKind::Return) || ShouldEmitUnreachable) { |
| 1222 | Builder.CreateUnreachable(); |
| 1223 | Builder.ClearInsertionPoint(); |
| 1224 | } |
Richard Smith | 9f9e582 | 2012-10-04 23:52:29 +0000 | [diff] [blame] | 1225 | } |
| 1226 | |
John McCall | 89b12b3 | 2010-02-18 03:17:58 +0000 | [diff] [blame] | 1227 | // Emit the standard function epilogue. |
| 1228 | FinishFunction(BodyRange.getEnd()); |
John McCall | 8601a75 | 2010-08-03 22:46:07 +0000 | [diff] [blame] | 1229 | |
| 1230 | // If we haven't marked the function nothrow through other means, do |
| 1231 | // a quick pass now to see if we can. |
| 1232 | if (!CurFn->doesNotThrow()) |
| 1233 | TryMarkNoThrow(CurFn); |
Chris Lattner | 5696e7b | 2008-06-17 18:05:57 +0000 | [diff] [blame] | 1234 | } |
| 1235 | |
Chris Lattner | 5b1964b | 2008-11-11 07:41:27 +0000 | [diff] [blame] | 1236 | /// ContainsLabel - Return true if the statement contains a label in it. If |
| 1237 | /// this statement is not executed normally, it not containing a label means |
| 1238 | /// that we can just remove the code. |
| 1239 | bool CodeGenFunction::ContainsLabel(const Stmt *S, bool IgnoreCaseStmts) { |
| 1240 | // Null statement, not a label! |
Craig Topper | 8a13c41 | 2014-05-21 05:09:00 +0000 | [diff] [blame] | 1241 | if (!S) return false; |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1242 | |
Chris Lattner | 5b1964b | 2008-11-11 07:41:27 +0000 | [diff] [blame] | 1243 | // If this is a label, we have to emit the code, consider something like: |
| 1244 | // if (0) { ... foo: bar(); } goto foo; |
Chris Lattner | 29911cc | 2011-02-28 00:18:40 +0000 | [diff] [blame] | 1245 | // |
| 1246 | // TODO: If anyone cared, we could track __label__'s, since we know that you |
| 1247 | // can't jump to one from outside their declared region. |
Chris Lattner | 5b1964b | 2008-11-11 07:41:27 +0000 | [diff] [blame] | 1248 | if (isa<LabelStmt>(S)) |
| 1249 | return true; |
Michael Ilseman | 686240a | 2012-12-04 00:29:55 +0000 | [diff] [blame] | 1250 | |
Chris Lattner | 5b1964b | 2008-11-11 07:41:27 +0000 | [diff] [blame] | 1251 | // If this is a case/default statement, and we haven't seen a switch, we have |
| 1252 | // to emit the code. |
| 1253 | if (isa<SwitchCase>(S) && !IgnoreCaseStmts) |
| 1254 | return true; |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1255 | |
Chris Lattner | 5b1964b | 2008-11-11 07:41:27 +0000 | [diff] [blame] | 1256 | // If this is a switch statement, we want to ignore cases below it. |
| 1257 | if (isa<SwitchStmt>(S)) |
| 1258 | IgnoreCaseStmts = true; |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1259 | |
Chris Lattner | 5b1964b | 2008-11-11 07:41:27 +0000 | [diff] [blame] | 1260 | // Scan subexpressions for verboten labels. |
Benjamin Kramer | 642f173 | 2015-07-02 21:03:14 +0000 | [diff] [blame] | 1261 | for (const Stmt *SubStmt : S->children()) |
| 1262 | if (ContainsLabel(SubStmt, IgnoreCaseStmts)) |
Chris Lattner | 5b1964b | 2008-11-11 07:41:27 +0000 | [diff] [blame] | 1263 | return true; |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1264 | |
Chris Lattner | 5b1964b | 2008-11-11 07:41:27 +0000 | [diff] [blame] | 1265 | return false; |
| 1266 | } |
| 1267 | |
Chris Lattner | 29911cc | 2011-02-28 00:18:40 +0000 | [diff] [blame] | 1268 | /// containsBreak - Return true if the statement contains a break out of it. |
| 1269 | /// If the statement (recursively) contains a switch or loop with a break |
| 1270 | /// inside of it, this is fine. |
| 1271 | bool CodeGenFunction::containsBreak(const Stmt *S) { |
| 1272 | // Null statement, not a label! |
Craig Topper | 8a13c41 | 2014-05-21 05:09:00 +0000 | [diff] [blame] | 1273 | if (!S) return false; |
Chris Lattner | 29911cc | 2011-02-28 00:18:40 +0000 | [diff] [blame] | 1274 | |
| 1275 | // If this is a switch or loop that defines its own break scope, then we can |
| 1276 | // include it and anything inside of it. |
| 1277 | if (isa<SwitchStmt>(S) || isa<WhileStmt>(S) || isa<DoStmt>(S) || |
| 1278 | isa<ForStmt>(S)) |
Chris Lattner | 30db828 | 2011-02-28 00:42:31 +0000 | [diff] [blame] | 1279 | return false; |
Michael Ilseman | 686240a | 2012-12-04 00:29:55 +0000 | [diff] [blame] | 1280 | |
Chris Lattner | 30db828 | 2011-02-28 00:42:31 +0000 | [diff] [blame] | 1281 | if (isa<BreakStmt>(S)) |
Chris Lattner | 29911cc | 2011-02-28 00:18:40 +0000 | [diff] [blame] | 1282 | return true; |
Michael Ilseman | 686240a | 2012-12-04 00:29:55 +0000 | [diff] [blame] | 1283 | |
Chris Lattner | 29911cc | 2011-02-28 00:18:40 +0000 | [diff] [blame] | 1284 | // Scan subexpressions for verboten breaks. |
Benjamin Kramer | 642f173 | 2015-07-02 21:03:14 +0000 | [diff] [blame] | 1285 | for (const Stmt *SubStmt : S->children()) |
| 1286 | if (containsBreak(SubStmt)) |
Chris Lattner | 29911cc | 2011-02-28 00:18:40 +0000 | [diff] [blame] | 1287 | return true; |
Michael Ilseman | 686240a | 2012-12-04 00:29:55 +0000 | [diff] [blame] | 1288 | |
Chris Lattner | 29911cc | 2011-02-28 00:18:40 +0000 | [diff] [blame] | 1289 | return false; |
| 1290 | } |
| 1291 | |
Richard Smith | d8e3ac3 | 2016-09-16 23:30:39 +0000 | [diff] [blame] | 1292 | bool CodeGenFunction::mightAddDeclToScope(const Stmt *S) { |
| 1293 | if (!S) return false; |
| 1294 | |
| 1295 | // Some statement kinds add a scope and thus never add a decl to the current |
| 1296 | // scope. Note, this list is longer than the list of statements that might |
| 1297 | // have an unscoped decl nested within them, but this way is conservatively |
| 1298 | // correct even if more statement kinds are added. |
| 1299 | if (isa<IfStmt>(S) || isa<SwitchStmt>(S) || isa<WhileStmt>(S) || |
| 1300 | isa<DoStmt>(S) || isa<ForStmt>(S) || isa<CompoundStmt>(S) || |
| 1301 | isa<CXXForRangeStmt>(S) || isa<CXXTryStmt>(S) || |
| 1302 | isa<ObjCForCollectionStmt>(S) || isa<ObjCAtTryStmt>(S)) |
| 1303 | return false; |
| 1304 | |
| 1305 | if (isa<DeclStmt>(S)) |
| 1306 | return true; |
| 1307 | |
| 1308 | for (const Stmt *SubStmt : S->children()) |
| 1309 | if (mightAddDeclToScope(SubStmt)) |
| 1310 | return true; |
| 1311 | |
| 1312 | return false; |
| 1313 | } |
Chris Lattner | cd43929 | 2008-11-12 08:04:58 +0000 | [diff] [blame] | 1314 | |
Chris Lattner | 41c6ab5 | 2011-02-27 23:02:32 +0000 | [diff] [blame] | 1315 | /// ConstantFoldsToSimpleInteger - If the specified expression does not fold |
| 1316 | /// to a constant, or if it does but contains a label, return false. If it |
| 1317 | /// constant folds return true and set the boolean result in Result. |
| 1318 | bool CodeGenFunction::ConstantFoldsToSimpleInteger(const Expr *Cond, |
Richard Smith | b130fe7 | 2016-06-23 19:16:49 +0000 | [diff] [blame] | 1319 | bool &ResultBool, |
| 1320 | bool AllowLabels) { |
Richard Trieu | c320c74 | 2012-07-23 20:21:35 +0000 | [diff] [blame] | 1321 | llvm::APSInt ResultInt; |
Richard Smith | b130fe7 | 2016-06-23 19:16:49 +0000 | [diff] [blame] | 1322 | if (!ConstantFoldsToSimpleInteger(Cond, ResultInt, AllowLabels)) |
Chris Lattner | 29911cc | 2011-02-28 00:18:40 +0000 | [diff] [blame] | 1323 | return false; |
Michael Ilseman | 686240a | 2012-12-04 00:29:55 +0000 | [diff] [blame] | 1324 | |
Chris Lattner | 29911cc | 2011-02-28 00:18:40 +0000 | [diff] [blame] | 1325 | ResultBool = ResultInt.getBoolValue(); |
| 1326 | return true; |
| 1327 | } |
| 1328 | |
| 1329 | /// ConstantFoldsToSimpleInteger - If the specified expression does not fold |
| 1330 | /// to a constant, or if it does but contains a label, return false. If it |
| 1331 | /// constant folds return true and set the folded value. |
Richard Smith | b130fe7 | 2016-06-23 19:16:49 +0000 | [diff] [blame] | 1332 | bool CodeGenFunction::ConstantFoldsToSimpleInteger(const Expr *Cond, |
| 1333 | llvm::APSInt &ResultInt, |
| 1334 | bool AllowLabels) { |
Daniel Dunbar | f32443c | 2008-11-12 22:37:10 +0000 | [diff] [blame] | 1335 | // FIXME: Rename and handle conversion of other evaluatable things |
| 1336 | // to bool. |
Fangrui Song | 407659a | 2018-11-30 23:41:18 +0000 | [diff] [blame] | 1337 | Expr::EvalResult Result; |
| 1338 | if (!Cond->EvaluateAsInt(Result, getContext())) |
Chris Lattner | 41c6ab5 | 2011-02-27 23:02:32 +0000 | [diff] [blame] | 1339 | return false; // Not foldable, not integer or not fully evaluatable. |
Richard Smith | 5fab0c9 | 2011-12-28 19:48:30 +0000 | [diff] [blame] | 1340 | |
Fangrui Song | 407659a | 2018-11-30 23:41:18 +0000 | [diff] [blame] | 1341 | llvm::APSInt Int = Result.Val.getInt(); |
Richard Smith | b130fe7 | 2016-06-23 19:16:49 +0000 | [diff] [blame] | 1342 | if (!AllowLabels && CodeGenFunction::ContainsLabel(Cond)) |
Chris Lattner | 41c6ab5 | 2011-02-27 23:02:32 +0000 | [diff] [blame] | 1343 | return false; // Contains a label. |
Richard Smith | 5fab0c9 | 2011-12-28 19:48:30 +0000 | [diff] [blame] | 1344 | |
| 1345 | ResultInt = Int; |
Chris Lattner | 41c6ab5 | 2011-02-27 23:02:32 +0000 | [diff] [blame] | 1346 | return true; |
Chris Lattner | cd43929 | 2008-11-12 08:04:58 +0000 | [diff] [blame] | 1347 | } |
| 1348 | |
| 1349 | |
Chris Lattner | 29911cc | 2011-02-28 00:18:40 +0000 | [diff] [blame] | 1350 | |
Chris Lattner | cd43929 | 2008-11-12 08:04:58 +0000 | [diff] [blame] | 1351 | /// EmitBranchOnBoolExpr - Emit a branch on a boolean condition (e.g. for an if |
| 1352 | /// statement) to the specified blocks. Based on the condition, this might try |
| 1353 | /// to simplify the codegen of the conditional based on the branch. |
| 1354 | /// |
| 1355 | void CodeGenFunction::EmitBranchOnBoolExpr(const Expr *Cond, |
| 1356 | llvm::BasicBlock *TrueBlock, |
Justin Bogner | ef512b9 | 2014-01-06 22:27:43 +0000 | [diff] [blame] | 1357 | llvm::BasicBlock *FalseBlock, |
| 1358 | uint64_t TrueCount) { |
Peter Collingbourne | 9114759 | 2011-04-15 00:35:48 +0000 | [diff] [blame] | 1359 | Cond = Cond->IgnoreParens(); |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1360 | |
Chris Lattner | cd43929 | 2008-11-12 08:04:58 +0000 | [diff] [blame] | 1361 | if (const BinaryOperator *CondBOp = dyn_cast<BinaryOperator>(Cond)) { |
Justin Bogner | ef512b9 | 2014-01-06 22:27:43 +0000 | [diff] [blame] | 1362 | |
Chris Lattner | cd43929 | 2008-11-12 08:04:58 +0000 | [diff] [blame] | 1363 | // Handle X && Y in a condition. |
John McCall | e302792 | 2010-08-25 11:45:40 +0000 | [diff] [blame] | 1364 | if (CondBOp->getOpcode() == BO_LAnd) { |
Chris Lattner | cd43929 | 2008-11-12 08:04:58 +0000 | [diff] [blame] | 1365 | // If we have "1 && X", simplify the code. "0 && X" would have constant |
| 1366 | // folded if the case was simple enough. |
Bill Wendling | 6c9540e | 2011-03-04 21:46:03 +0000 | [diff] [blame] | 1367 | bool ConstantBool = false; |
Chris Lattner | 41c6ab5 | 2011-02-27 23:02:32 +0000 | [diff] [blame] | 1368 | if (ConstantFoldsToSimpleInteger(CondBOp->getLHS(), ConstantBool) && |
| 1369 | ConstantBool) { |
Chris Lattner | cd43929 | 2008-11-12 08:04:58 +0000 | [diff] [blame] | 1370 | // br(1 && X) -> br(X). |
Justin Bogner | 66242d6 | 2015-04-23 23:06:47 +0000 | [diff] [blame] | 1371 | incrementProfileCounter(CondBOp); |
Justin Bogner | ef512b9 | 2014-01-06 22:27:43 +0000 | [diff] [blame] | 1372 | return EmitBranchOnBoolExpr(CondBOp->getRHS(), TrueBlock, FalseBlock, |
| 1373 | TrueCount); |
Chris Lattner | cd43929 | 2008-11-12 08:04:58 +0000 | [diff] [blame] | 1374 | } |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1375 | |
Chris Lattner | cd43929 | 2008-11-12 08:04:58 +0000 | [diff] [blame] | 1376 | // If we have "X && 1", simplify the code to use an uncond branch. |
| 1377 | // "X && 0" would have been constant folded to 0. |
Chris Lattner | 41c6ab5 | 2011-02-27 23:02:32 +0000 | [diff] [blame] | 1378 | if (ConstantFoldsToSimpleInteger(CondBOp->getRHS(), ConstantBool) && |
| 1379 | ConstantBool) { |
Chris Lattner | cd43929 | 2008-11-12 08:04:58 +0000 | [diff] [blame] | 1380 | // br(X && 1) -> br(X). |
Justin Bogner | ef512b9 | 2014-01-06 22:27:43 +0000 | [diff] [blame] | 1381 | return EmitBranchOnBoolExpr(CondBOp->getLHS(), TrueBlock, FalseBlock, |
| 1382 | TrueCount); |
Chris Lattner | cd43929 | 2008-11-12 08:04:58 +0000 | [diff] [blame] | 1383 | } |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1384 | |
Chris Lattner | cd43929 | 2008-11-12 08:04:58 +0000 | [diff] [blame] | 1385 | // Emit the LHS as a conditional. If the LHS conditional is false, we |
| 1386 | // want to jump to the FalseBlock. |
Daniel Dunbar | a612e79 | 2008-11-13 01:38:36 +0000 | [diff] [blame] | 1387 | llvm::BasicBlock *LHSTrue = createBasicBlock("land.lhs.true"); |
Justin Bogner | ef512b9 | 2014-01-06 22:27:43 +0000 | [diff] [blame] | 1388 | // The counter tells us how often we evaluate RHS, and all of TrueCount |
| 1389 | // can be propagated to that branch. |
Justin Bogner | 66242d6 | 2015-04-23 23:06:47 +0000 | [diff] [blame] | 1390 | uint64_t RHSCount = getProfileCount(CondBOp->getRHS()); |
John McCall | ce1de61 | 2011-01-26 04:00:11 +0000 | [diff] [blame] | 1391 | |
| 1392 | ConditionalEvaluation eval(*this); |
David Blaikie | 298720d | 2015-01-28 19:50:09 +0000 | [diff] [blame] | 1393 | { |
| 1394 | ApplyDebugLocation DL(*this, Cond); |
| 1395 | EmitBranchOnBoolExpr(CondBOp->getLHS(), LHSTrue, FalseBlock, RHSCount); |
| 1396 | EmitBlock(LHSTrue); |
| 1397 | } |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1398 | |
Justin Bogner | 66242d6 | 2015-04-23 23:06:47 +0000 | [diff] [blame] | 1399 | incrementProfileCounter(CondBOp); |
| 1400 | setCurrentProfileCount(getProfileCount(CondBOp->getRHS())); |
| 1401 | |
Anders Carlsson | 60ddba6 | 2010-01-24 00:20:05 +0000 | [diff] [blame] | 1402 | // Any temporaries created here are conditional. |
John McCall | ce1de61 | 2011-01-26 04:00:11 +0000 | [diff] [blame] | 1403 | eval.begin(*this); |
Justin Bogner | ef512b9 | 2014-01-06 22:27:43 +0000 | [diff] [blame] | 1404 | EmitBranchOnBoolExpr(CondBOp->getRHS(), TrueBlock, FalseBlock, TrueCount); |
John McCall | ce1de61 | 2011-01-26 04:00:11 +0000 | [diff] [blame] | 1405 | eval.end(*this); |
Anders Carlsson | 60ddba6 | 2010-01-24 00:20:05 +0000 | [diff] [blame] | 1406 | |
Chris Lattner | cd43929 | 2008-11-12 08:04:58 +0000 | [diff] [blame] | 1407 | return; |
Chris Lattner | 41c6ab5 | 2011-02-27 23:02:32 +0000 | [diff] [blame] | 1408 | } |
Michael Ilseman | 686240a | 2012-12-04 00:29:55 +0000 | [diff] [blame] | 1409 | |
Chris Lattner | 41c6ab5 | 2011-02-27 23:02:32 +0000 | [diff] [blame] | 1410 | if (CondBOp->getOpcode() == BO_LOr) { |
Chris Lattner | cd43929 | 2008-11-12 08:04:58 +0000 | [diff] [blame] | 1411 | // If we have "0 || X", simplify the code. "1 || X" would have constant |
| 1412 | // folded if the case was simple enough. |
Bill Wendling | 6c9540e | 2011-03-04 21:46:03 +0000 | [diff] [blame] | 1413 | bool ConstantBool = false; |
Chris Lattner | 41c6ab5 | 2011-02-27 23:02:32 +0000 | [diff] [blame] | 1414 | if (ConstantFoldsToSimpleInteger(CondBOp->getLHS(), ConstantBool) && |
| 1415 | !ConstantBool) { |
Chris Lattner | cd43929 | 2008-11-12 08:04:58 +0000 | [diff] [blame] | 1416 | // br(0 || X) -> br(X). |
Justin Bogner | 66242d6 | 2015-04-23 23:06:47 +0000 | [diff] [blame] | 1417 | incrementProfileCounter(CondBOp); |
Justin Bogner | ef512b9 | 2014-01-06 22:27:43 +0000 | [diff] [blame] | 1418 | return EmitBranchOnBoolExpr(CondBOp->getRHS(), TrueBlock, FalseBlock, |
| 1419 | TrueCount); |
Chris Lattner | cd43929 | 2008-11-12 08:04:58 +0000 | [diff] [blame] | 1420 | } |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1421 | |
Chris Lattner | cd43929 | 2008-11-12 08:04:58 +0000 | [diff] [blame] | 1422 | // If we have "X || 0", simplify the code to use an uncond branch. |
| 1423 | // "X || 1" would have been constant folded to 1. |
Chris Lattner | 41c6ab5 | 2011-02-27 23:02:32 +0000 | [diff] [blame] | 1424 | if (ConstantFoldsToSimpleInteger(CondBOp->getRHS(), ConstantBool) && |
| 1425 | !ConstantBool) { |
Chris Lattner | cd43929 | 2008-11-12 08:04:58 +0000 | [diff] [blame] | 1426 | // br(X || 0) -> br(X). |
Justin Bogner | ef512b9 | 2014-01-06 22:27:43 +0000 | [diff] [blame] | 1427 | return EmitBranchOnBoolExpr(CondBOp->getLHS(), TrueBlock, FalseBlock, |
| 1428 | TrueCount); |
Chris Lattner | cd43929 | 2008-11-12 08:04:58 +0000 | [diff] [blame] | 1429 | } |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1430 | |
Chris Lattner | cd43929 | 2008-11-12 08:04:58 +0000 | [diff] [blame] | 1431 | // Emit the LHS as a conditional. If the LHS conditional is true, we |
| 1432 | // want to jump to the TrueBlock. |
Daniel Dunbar | a612e79 | 2008-11-13 01:38:36 +0000 | [diff] [blame] | 1433 | llvm::BasicBlock *LHSFalse = createBasicBlock("lor.lhs.false"); |
Justin Bogner | ef512b9 | 2014-01-06 22:27:43 +0000 | [diff] [blame] | 1434 | // We have the count for entry to the RHS and for the whole expression |
| 1435 | // being true, so we can divy up True count between the short circuit and |
| 1436 | // the RHS. |
Justin Bogner | 66242d6 | 2015-04-23 23:06:47 +0000 | [diff] [blame] | 1437 | uint64_t LHSCount = |
| 1438 | getCurrentProfileCount() - getProfileCount(CondBOp->getRHS()); |
Justin Bogner | ef512b9 | 2014-01-06 22:27:43 +0000 | [diff] [blame] | 1439 | uint64_t RHSCount = TrueCount - LHSCount; |
John McCall | ce1de61 | 2011-01-26 04:00:11 +0000 | [diff] [blame] | 1440 | |
| 1441 | ConditionalEvaluation eval(*this); |
David Blaikie | 298720d | 2015-01-28 19:50:09 +0000 | [diff] [blame] | 1442 | { |
| 1443 | ApplyDebugLocation DL(*this, Cond); |
| 1444 | EmitBranchOnBoolExpr(CondBOp->getLHS(), TrueBlock, LHSFalse, LHSCount); |
| 1445 | EmitBlock(LHSFalse); |
| 1446 | } |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1447 | |
Justin Bogner | 66242d6 | 2015-04-23 23:06:47 +0000 | [diff] [blame] | 1448 | incrementProfileCounter(CondBOp); |
| 1449 | setCurrentProfileCount(getProfileCount(CondBOp->getRHS())); |
| 1450 | |
Anders Carlsson | 60ddba6 | 2010-01-24 00:20:05 +0000 | [diff] [blame] | 1451 | // Any temporaries created here are conditional. |
John McCall | ce1de61 | 2011-01-26 04:00:11 +0000 | [diff] [blame] | 1452 | eval.begin(*this); |
Justin Bogner | ef512b9 | 2014-01-06 22:27:43 +0000 | [diff] [blame] | 1453 | EmitBranchOnBoolExpr(CondBOp->getRHS(), TrueBlock, FalseBlock, RHSCount); |
| 1454 | |
John McCall | ce1de61 | 2011-01-26 04:00:11 +0000 | [diff] [blame] | 1455 | eval.end(*this); |
Anders Carlsson | 60ddba6 | 2010-01-24 00:20:05 +0000 | [diff] [blame] | 1456 | |
Chris Lattner | cd43929 | 2008-11-12 08:04:58 +0000 | [diff] [blame] | 1457 | return; |
| 1458 | } |
Chris Lattner | d953773 | 2008-11-12 08:13:36 +0000 | [diff] [blame] | 1459 | } |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1460 | |
Chris Lattner | d953773 | 2008-11-12 08:13:36 +0000 | [diff] [blame] | 1461 | if (const UnaryOperator *CondUOp = dyn_cast<UnaryOperator>(Cond)) { |
| 1462 | // br(!x, t, f) -> br(x, f, t) |
Justin Bogner | ef512b9 | 2014-01-06 22:27:43 +0000 | [diff] [blame] | 1463 | if (CondUOp->getOpcode() == UO_LNot) { |
| 1464 | // Negate the count. |
Justin Bogner | 66242d6 | 2015-04-23 23:06:47 +0000 | [diff] [blame] | 1465 | uint64_t FalseCount = getCurrentProfileCount() - TrueCount; |
Justin Bogner | ef512b9 | 2014-01-06 22:27:43 +0000 | [diff] [blame] | 1466 | // Negate the condition and swap the destination blocks. |
| 1467 | return EmitBranchOnBoolExpr(CondUOp->getSubExpr(), FalseBlock, TrueBlock, |
| 1468 | FalseCount); |
| 1469 | } |
Chris Lattner | cd43929 | 2008-11-12 08:04:58 +0000 | [diff] [blame] | 1470 | } |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1471 | |
Daniel Dunbar | bf3c22e | 2008-11-12 10:30:32 +0000 | [diff] [blame] | 1472 | if (const ConditionalOperator *CondOp = dyn_cast<ConditionalOperator>(Cond)) { |
Eli Friedman | 248f898 | 2012-02-14 03:54:45 +0000 | [diff] [blame] | 1473 | // br(c ? x : y, t, f) -> br(c, br(x, t, f), br(y, t, f)) |
| 1474 | llvm::BasicBlock *LHSBlock = createBasicBlock("cond.true"); |
| 1475 | llvm::BasicBlock *RHSBlock = createBasicBlock("cond.false"); |
Daniel Dunbar | bf3c22e | 2008-11-12 10:30:32 +0000 | [diff] [blame] | 1476 | |
Eli Friedman | 248f898 | 2012-02-14 03:54:45 +0000 | [diff] [blame] | 1477 | ConditionalEvaluation cond(*this); |
Justin Bogner | 66242d6 | 2015-04-23 23:06:47 +0000 | [diff] [blame] | 1478 | EmitBranchOnBoolExpr(CondOp->getCond(), LHSBlock, RHSBlock, |
| 1479 | getProfileCount(CondOp)); |
Justin Bogner | ef512b9 | 2014-01-06 22:27:43 +0000 | [diff] [blame] | 1480 | |
| 1481 | // When computing PGO branch weights, we only know the overall count for |
| 1482 | // the true block. This code is essentially doing tail duplication of the |
| 1483 | // naive code-gen, introducing new edges for which counts are not |
| 1484 | // available. Divide the counts proportionally between the LHS and RHS of |
| 1485 | // the conditional operator. |
| 1486 | uint64_t LHSScaledTrueCount = 0; |
| 1487 | if (TrueCount) { |
Justin Bogner | 66242d6 | 2015-04-23 23:06:47 +0000 | [diff] [blame] | 1488 | double LHSRatio = |
| 1489 | getProfileCount(CondOp) / (double)getCurrentProfileCount(); |
Justin Bogner | ef512b9 | 2014-01-06 22:27:43 +0000 | [diff] [blame] | 1490 | LHSScaledTrueCount = TrueCount * LHSRatio; |
| 1491 | } |
John McCall | ce1de61 | 2011-01-26 04:00:11 +0000 | [diff] [blame] | 1492 | |
Eli Friedman | 248f898 | 2012-02-14 03:54:45 +0000 | [diff] [blame] | 1493 | cond.begin(*this); |
| 1494 | EmitBlock(LHSBlock); |
Justin Bogner | 66242d6 | 2015-04-23 23:06:47 +0000 | [diff] [blame] | 1495 | incrementProfileCounter(CondOp); |
David Blaikie | 298720d | 2015-01-28 19:50:09 +0000 | [diff] [blame] | 1496 | { |
| 1497 | ApplyDebugLocation DL(*this, Cond); |
| 1498 | EmitBranchOnBoolExpr(CondOp->getLHS(), TrueBlock, FalseBlock, |
| 1499 | LHSScaledTrueCount); |
| 1500 | } |
Eli Friedman | 248f898 | 2012-02-14 03:54:45 +0000 | [diff] [blame] | 1501 | cond.end(*this); |
John McCall | ce1de61 | 2011-01-26 04:00:11 +0000 | [diff] [blame] | 1502 | |
Eli Friedman | 248f898 | 2012-02-14 03:54:45 +0000 | [diff] [blame] | 1503 | cond.begin(*this); |
| 1504 | EmitBlock(RHSBlock); |
Justin Bogner | ef512b9 | 2014-01-06 22:27:43 +0000 | [diff] [blame] | 1505 | EmitBranchOnBoolExpr(CondOp->getRHS(), TrueBlock, FalseBlock, |
| 1506 | TrueCount - LHSScaledTrueCount); |
Eli Friedman | 248f898 | 2012-02-14 03:54:45 +0000 | [diff] [blame] | 1507 | cond.end(*this); |
John McCall | ce1de61 | 2011-01-26 04:00:11 +0000 | [diff] [blame] | 1508 | |
Eli Friedman | 248f898 | 2012-02-14 03:54:45 +0000 | [diff] [blame] | 1509 | return; |
Daniel Dunbar | bf3c22e | 2008-11-12 10:30:32 +0000 | [diff] [blame] | 1510 | } |
| 1511 | |
Richard Smith | ea85232 | 2013-05-07 21:53:22 +0000 | [diff] [blame] | 1512 | if (const CXXThrowExpr *Throw = dyn_cast<CXXThrowExpr>(Cond)) { |
| 1513 | // Conditional operator handling can give us a throw expression as a |
| 1514 | // condition for a case like: |
| 1515 | // br(c ? throw x : y, t, f) -> br(c, br(throw x, t, f), br(y, t, f) |
| 1516 | // Fold this to: |
| 1517 | // br(c, throw x, br(y, t, f)) |
| 1518 | EmitCXXThrowExpr(Throw, /*KeepInsertionPoint*/false); |
| 1519 | return; |
| 1520 | } |
| 1521 | |
Sanjay Patel | a24296b | 2015-09-02 20:01:30 +0000 | [diff] [blame] | 1522 | // If the branch has a condition wrapped by __builtin_unpredictable, |
| 1523 | // create metadata that specifies that the branch is unpredictable. |
| 1524 | // Don't bother if not optimizing because that metadata would not be used. |
| 1525 | llvm::MDNode *Unpredictable = nullptr; |
Erich Keane | 8c94f07 | 2018-12-12 20:30:53 +0000 | [diff] [blame] | 1526 | auto *Call = dyn_cast<CallExpr>(Cond->IgnoreImpCasts()); |
Sanjay Patel | 3fd323f | 2016-04-19 18:06:33 +0000 | [diff] [blame] | 1527 | if (Call && CGM.getCodeGenOpts().OptimizationLevel != 0) { |
| 1528 | auto *FD = dyn_cast_or_null<FunctionDecl>(Call->getCalleeDecl()); |
| 1529 | if (FD && FD->getBuiltinID() == Builtin::BI__builtin_unpredictable) { |
| 1530 | llvm::MDBuilder MDHelper(getLLVMContext()); |
| 1531 | Unpredictable = MDHelper.createUnpredictable(); |
Sanjay Patel | a24296b | 2015-09-02 20:01:30 +0000 | [diff] [blame] | 1532 | } |
| 1533 | } |
| 1534 | |
Justin Bogner | ef512b9 | 2014-01-06 22:27:43 +0000 | [diff] [blame] | 1535 | // Create branch weights based on the number of times we get here and the |
| 1536 | // number of times the condition should be true. |
Justin Bogner | 66242d6 | 2015-04-23 23:06:47 +0000 | [diff] [blame] | 1537 | uint64_t CurrentCount = std::max(getCurrentProfileCount(), TrueCount); |
Justin Bogner | 6551264 | 2015-05-02 05:00:55 +0000 | [diff] [blame] | 1538 | llvm::MDNode *Weights = |
| 1539 | createProfileWeights(TrueCount, CurrentCount - TrueCount); |
Justin Bogner | ef512b9 | 2014-01-06 22:27:43 +0000 | [diff] [blame] | 1540 | |
Chris Lattner | cd43929 | 2008-11-12 08:04:58 +0000 | [diff] [blame] | 1541 | // Emit the code with the fully general case. |
David Blaikie | 303facb | 2015-01-31 01:10:11 +0000 | [diff] [blame] | 1542 | llvm::Value *CondV; |
| 1543 | { |
| 1544 | ApplyDebugLocation DL(*this, Cond); |
| 1545 | CondV = EvaluateExprAsBool(Cond); |
| 1546 | } |
Sanjay Patel | a24296b | 2015-09-02 20:01:30 +0000 | [diff] [blame] | 1547 | Builder.CreateCondBr(CondV, TrueBlock, FalseBlock, Weights, Unpredictable); |
Chris Lattner | cd43929 | 2008-11-12 08:04:58 +0000 | [diff] [blame] | 1548 | } |
| 1549 | |
Daniel Dunbar | a7c8cf6 | 2008-08-16 00:56:44 +0000 | [diff] [blame] | 1550 | /// ErrorUnsupported - Print out an error that codegen doesn't support the |
Chris Lattner | fc94434 | 2007-12-02 01:43:38 +0000 | [diff] [blame] | 1551 | /// specified stmt yet. |
David Blaikie | 4a9ec7b | 2013-08-19 21:02:26 +0000 | [diff] [blame] | 1552 | void CodeGenFunction::ErrorUnsupported(const Stmt *S, const char *Type) { |
| 1553 | CGM.ErrorUnsupported(S, Type); |
Chris Lattner | fc94434 | 2007-12-02 01:43:38 +0000 | [diff] [blame] | 1554 | } |
| 1555 | |
John McCall | 2725aa1 | 2011-02-01 21:35:06 +0000 | [diff] [blame] | 1556 | /// emitNonZeroVLAInit - Emit the "zero" initialization of a |
| 1557 | /// variable-length array whose elements have a non-zero bit-pattern. |
| 1558 | /// |
James Dennett | be30245 | 2012-06-15 22:10:14 +0000 | [diff] [blame] | 1559 | /// \param baseType the inner-most element type of the array |
John McCall | 2725aa1 | 2011-02-01 21:35:06 +0000 | [diff] [blame] | 1560 | /// \param src - a char* pointing to the bit-pattern for a single |
| 1561 | /// base element of the array |
| 1562 | /// \param sizeInChars - the total size of the VLA, in chars |
John McCall | 2725aa1 | 2011-02-01 21:35:06 +0000 | [diff] [blame] | 1563 | static void emitNonZeroVLAInit(CodeGenFunction &CGF, QualType baseType, |
John McCall | 7f416cc | 2015-09-08 08:05:57 +0000 | [diff] [blame] | 1564 | Address dest, Address src, |
John McCall | 2725aa1 | 2011-02-01 21:35:06 +0000 | [diff] [blame] | 1565 | llvm::Value *sizeInChars) { |
John McCall | 2725aa1 | 2011-02-01 21:35:06 +0000 | [diff] [blame] | 1566 | CGBuilderTy &Builder = CGF.Builder; |
| 1567 | |
John McCall | 7f416cc | 2015-09-08 08:05:57 +0000 | [diff] [blame] | 1568 | CharUnits baseSize = CGF.getContext().getTypeSizeInChars(baseType); |
John McCall | 2725aa1 | 2011-02-01 21:35:06 +0000 | [diff] [blame] | 1569 | llvm::Value *baseSizeInChars |
John McCall | 7f416cc | 2015-09-08 08:05:57 +0000 | [diff] [blame] | 1570 | = llvm::ConstantInt::get(CGF.IntPtrTy, baseSize.getQuantity()); |
John McCall | 2725aa1 | 2011-02-01 21:35:06 +0000 | [diff] [blame] | 1571 | |
John McCall | 7f416cc | 2015-09-08 08:05:57 +0000 | [diff] [blame] | 1572 | Address begin = |
| 1573 | Builder.CreateElementBitCast(dest, CGF.Int8Ty, "vla.begin"); |
| 1574 | llvm::Value *end = |
| 1575 | Builder.CreateInBoundsGEP(begin.getPointer(), sizeInChars, "vla.end"); |
John McCall | 2725aa1 | 2011-02-01 21:35:06 +0000 | [diff] [blame] | 1576 | |
| 1577 | llvm::BasicBlock *originBB = CGF.Builder.GetInsertBlock(); |
| 1578 | llvm::BasicBlock *loopBB = CGF.createBasicBlock("vla-init.loop"); |
| 1579 | llvm::BasicBlock *contBB = CGF.createBasicBlock("vla-init.cont"); |
| 1580 | |
| 1581 | // Make a loop over the VLA. C99 guarantees that the VLA element |
| 1582 | // count must be nonzero. |
| 1583 | CGF.EmitBlock(loopBB); |
| 1584 | |
John McCall | 7f416cc | 2015-09-08 08:05:57 +0000 | [diff] [blame] | 1585 | llvm::PHINode *cur = Builder.CreatePHI(begin.getType(), 2, "vla.cur"); |
| 1586 | cur->addIncoming(begin.getPointer(), originBB); |
| 1587 | |
| 1588 | CharUnits curAlign = |
| 1589 | dest.getAlignment().alignmentOfArrayElement(baseSize); |
John McCall | 2725aa1 | 2011-02-01 21:35:06 +0000 | [diff] [blame] | 1590 | |
| 1591 | // memcpy the individual element bit-pattern. |
John McCall | 7f416cc | 2015-09-08 08:05:57 +0000 | [diff] [blame] | 1592 | Builder.CreateMemCpy(Address(cur, curAlign), src, baseSizeInChars, |
John McCall | 2725aa1 | 2011-02-01 21:35:06 +0000 | [diff] [blame] | 1593 | /*volatile*/ false); |
| 1594 | |
| 1595 | // Go to the next element. |
John McCall | 7f416cc | 2015-09-08 08:05:57 +0000 | [diff] [blame] | 1596 | llvm::Value *next = |
| 1597 | Builder.CreateInBoundsGEP(CGF.Int8Ty, cur, baseSizeInChars, "vla.next"); |
John McCall | 2725aa1 | 2011-02-01 21:35:06 +0000 | [diff] [blame] | 1598 | |
| 1599 | // Leave if that's the end of the VLA. |
| 1600 | llvm::Value *done = Builder.CreateICmpEQ(next, end, "vla-init.isdone"); |
| 1601 | Builder.CreateCondBr(done, contBB, loopBB); |
| 1602 | cur->addIncoming(next, loopBB); |
| 1603 | |
| 1604 | CGF.EmitBlock(contBB); |
Michael Ilseman | 686240a | 2012-12-04 00:29:55 +0000 | [diff] [blame] | 1605 | } |
John McCall | 2725aa1 | 2011-02-01 21:35:06 +0000 | [diff] [blame] | 1606 | |
Anders Carlsson | c0964b6 | 2010-05-22 17:35:42 +0000 | [diff] [blame] | 1607 | void |
John McCall | 7f416cc | 2015-09-08 08:05:57 +0000 | [diff] [blame] | 1608 | CodeGenFunction::EmitNullInitialization(Address DestPtr, QualType Ty) { |
Anders Carlsson | 16e94af | 2010-05-03 01:20:20 +0000 | [diff] [blame] | 1609 | // Ignore empty classes in C++. |
Richard Smith | 9c6890a | 2012-11-01 22:30:59 +0000 | [diff] [blame] | 1610 | if (getLangOpts().CPlusPlus) { |
Anders Carlsson | 16e94af | 2010-05-03 01:20:20 +0000 | [diff] [blame] | 1611 | if (const RecordType *RT = Ty->getAs<RecordType>()) { |
| 1612 | if (cast<CXXRecordDecl>(RT->getDecl())->isEmpty()) |
| 1613 | return; |
| 1614 | } |
| 1615 | } |
John McCall | 7cd1d97 | 2010-08-07 08:21:30 +0000 | [diff] [blame] | 1616 | |
| 1617 | // Cast the dest ptr to the appropriate i8 pointer type. |
John McCall | 7f416cc | 2015-09-08 08:05:57 +0000 | [diff] [blame] | 1618 | if (DestPtr.getElementType() != Int8Ty) |
| 1619 | DestPtr = Builder.CreateElementBitCast(DestPtr, Int8Ty); |
Anders Carlsson | 2e744e8 | 2008-08-30 19:51:14 +0000 | [diff] [blame] | 1620 | |
| 1621 | // Get size and alignment info for this aggregate. |
John McCall | 7f416cc | 2015-09-08 08:05:57 +0000 | [diff] [blame] | 1622 | CharUnits size = getContext().getTypeSizeInChars(Ty); |
Anders Carlsson | 2e744e8 | 2008-08-30 19:51:14 +0000 | [diff] [blame] | 1623 | |
John McCall | a08ffd2 | 2011-01-14 10:37:58 +0000 | [diff] [blame] | 1624 | llvm::Value *SizeVal; |
John McCall | 2725aa1 | 2011-02-01 21:35:06 +0000 | [diff] [blame] | 1625 | const VariableArrayType *vla; |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1626 | |
John McCall | a08ffd2 | 2011-01-14 10:37:58 +0000 | [diff] [blame] | 1627 | // Don't bother emitting a zero-byte memset. |
John McCall | 7f416cc | 2015-09-08 08:05:57 +0000 | [diff] [blame] | 1628 | if (size.isZero()) { |
John McCall | a08ffd2 | 2011-01-14 10:37:58 +0000 | [diff] [blame] | 1629 | // But note that getTypeInfo returns 0 for a VLA. |
| 1630 | if (const VariableArrayType *vlaType = |
| 1631 | dyn_cast_or_null<VariableArrayType>( |
| 1632 | getContext().getAsArrayType(Ty))) { |
Sander de Smalen | 891af03a | 2018-02-03 13:55:59 +0000 | [diff] [blame] | 1633 | auto VlaSize = getVLASize(vlaType); |
| 1634 | SizeVal = VlaSize.NumElts; |
| 1635 | CharUnits eltSize = getContext().getTypeSizeInChars(VlaSize.Type); |
John McCall | 23c29fe | 2011-06-24 21:55:10 +0000 | [diff] [blame] | 1636 | if (!eltSize.isOne()) |
| 1637 | SizeVal = Builder.CreateNUWMul(SizeVal, CGM.getSize(eltSize)); |
John McCall | 2725aa1 | 2011-02-01 21:35:06 +0000 | [diff] [blame] | 1638 | vla = vlaType; |
John McCall | a08ffd2 | 2011-01-14 10:37:58 +0000 | [diff] [blame] | 1639 | } else { |
| 1640 | return; |
| 1641 | } |
| 1642 | } else { |
John McCall | 7f416cc | 2015-09-08 08:05:57 +0000 | [diff] [blame] | 1643 | SizeVal = CGM.getSize(size); |
Craig Topper | 8a13c41 | 2014-05-21 05:09:00 +0000 | [diff] [blame] | 1644 | vla = nullptr; |
John McCall | a08ffd2 | 2011-01-14 10:37:58 +0000 | [diff] [blame] | 1645 | } |
John McCall | 7cd1d97 | 2010-08-07 08:21:30 +0000 | [diff] [blame] | 1646 | |
| 1647 | // If the type contains a pointer to data member we can't memset it to zero. |
| 1648 | // Instead, create a null constant and copy it to the destination. |
John McCall | 2725aa1 | 2011-02-01 21:35:06 +0000 | [diff] [blame] | 1649 | // TODO: there are other patterns besides zero that we can usefully memset, |
| 1650 | // like -1, which happens to be the pattern used by member-pointers. |
John McCall | 614dbdc | 2010-08-22 21:01:12 +0000 | [diff] [blame] | 1651 | if (!CGM.getTypes().isZeroInitializable(Ty)) { |
John McCall | 2725aa1 | 2011-02-01 21:35:06 +0000 | [diff] [blame] | 1652 | // For a VLA, emit a single element, then splat that over the VLA. |
| 1653 | if (vla) Ty = getContext().getBaseElementType(vla); |
John McCall | a08ffd2 | 2011-01-14 10:37:58 +0000 | [diff] [blame] | 1654 | |
John McCall | 7cd1d97 | 2010-08-07 08:21:30 +0000 | [diff] [blame] | 1655 | llvm::Constant *NullConstant = CGM.EmitNullConstant(Ty); |
| 1656 | |
Michael Ilseman | 686240a | 2012-12-04 00:29:55 +0000 | [diff] [blame] | 1657 | llvm::GlobalVariable *NullVariable = |
John McCall | 7cd1d97 | 2010-08-07 08:21:30 +0000 | [diff] [blame] | 1658 | new llvm::GlobalVariable(CGM.getModule(), NullConstant->getType(), |
Michael Ilseman | 686240a | 2012-12-04 00:29:55 +0000 | [diff] [blame] | 1659 | /*isConstant=*/true, |
John McCall | 7cd1d97 | 2010-08-07 08:21:30 +0000 | [diff] [blame] | 1660 | llvm::GlobalVariable::PrivateLinkage, |
Chris Lattner | 0e62c1c | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 1661 | NullConstant, Twine()); |
John McCall | 7f416cc | 2015-09-08 08:05:57 +0000 | [diff] [blame] | 1662 | CharUnits NullAlign = DestPtr.getAlignment(); |
| 1663 | NullVariable->setAlignment(NullAlign.getQuantity()); |
| 1664 | Address SrcPtr(Builder.CreateBitCast(NullVariable, Builder.getInt8PtrTy()), |
| 1665 | NullAlign); |
John McCall | 7cd1d97 | 2010-08-07 08:21:30 +0000 | [diff] [blame] | 1666 | |
John McCall | 2725aa1 | 2011-02-01 21:35:06 +0000 | [diff] [blame] | 1667 | if (vla) return emitNonZeroVLAInit(*this, Ty, DestPtr, SrcPtr, SizeVal); |
| 1668 | |
John McCall | 7cd1d97 | 2010-08-07 08:21:30 +0000 | [diff] [blame] | 1669 | // Get and call the appropriate llvm.memcpy overload. |
John McCall | 7f416cc | 2015-09-08 08:05:57 +0000 | [diff] [blame] | 1670 | Builder.CreateMemCpy(DestPtr, SrcPtr, SizeVal, false); |
John McCall | 7cd1d97 | 2010-08-07 08:21:30 +0000 | [diff] [blame] | 1671 | return; |
Michael Ilseman | 686240a | 2012-12-04 00:29:55 +0000 | [diff] [blame] | 1672 | } |
| 1673 | |
John McCall | 7cd1d97 | 2010-08-07 08:21:30 +0000 | [diff] [blame] | 1674 | // Otherwise, just memset the whole thing to zero. This is legal |
| 1675 | // because in LLVM, all default initializers (other than the ones we just |
| 1676 | // handled above) are guaranteed to have a bit pattern of all zeros. |
John McCall | 7f416cc | 2015-09-08 08:05:57 +0000 | [diff] [blame] | 1677 | Builder.CreateMemSet(DestPtr, Builder.getInt8(0), SizeVal, false); |
Anders Carlsson | 2e744e8 | 2008-08-30 19:51:14 +0000 | [diff] [blame] | 1678 | } |
| 1679 | |
Chris Lattner | c8e630e | 2011-02-17 07:39:24 +0000 | [diff] [blame] | 1680 | llvm::BlockAddress *CodeGenFunction::GetAddrOfLabel(const LabelDecl *L) { |
Chris Lattner | 6c4d255 | 2009-10-28 23:59:40 +0000 | [diff] [blame] | 1681 | // Make sure that there is a block for the indirect goto. |
Craig Topper | 8a13c41 | 2014-05-21 05:09:00 +0000 | [diff] [blame] | 1682 | if (!IndirectBranch) |
Chris Lattner | 6c4d255 | 2009-10-28 23:59:40 +0000 | [diff] [blame] | 1683 | GetIndirectGotoBlock(); |
Michael Ilseman | 686240a | 2012-12-04 00:29:55 +0000 | [diff] [blame] | 1684 | |
John McCall | ad5d61e | 2010-07-23 21:56:41 +0000 | [diff] [blame] | 1685 | llvm::BasicBlock *BB = getJumpDestForLabel(L).getBlock(); |
Michael Ilseman | 686240a | 2012-12-04 00:29:55 +0000 | [diff] [blame] | 1686 | |
Chris Lattner | 6c4d255 | 2009-10-28 23:59:40 +0000 | [diff] [blame] | 1687 | // Make sure the indirect branch includes all of the address-taken blocks. |
| 1688 | IndirectBranch->addDestination(BB); |
| 1689 | return llvm::BlockAddress::get(CurFn, BB); |
Chris Lattner | 2bb5cb4 | 2009-10-13 06:55:33 +0000 | [diff] [blame] | 1690 | } |
| 1691 | |
| 1692 | llvm::BasicBlock *CodeGenFunction::GetIndirectGotoBlock() { |
Chris Lattner | 6c4d255 | 2009-10-28 23:59:40 +0000 | [diff] [blame] | 1693 | // If we already made the indirect branch for indirect goto, return its block. |
| 1694 | if (IndirectBranch) return IndirectBranch->getParent(); |
Michael Ilseman | 686240a | 2012-12-04 00:29:55 +0000 | [diff] [blame] | 1695 | |
John McCall | 7f416cc | 2015-09-08 08:05:57 +0000 | [diff] [blame] | 1696 | CGBuilderTy TmpBuilder(*this, createBasicBlock("indirectgoto")); |
Michael Ilseman | 686240a | 2012-12-04 00:29:55 +0000 | [diff] [blame] | 1697 | |
Chris Lattner | 2bb5cb4 | 2009-10-13 06:55:33 +0000 | [diff] [blame] | 1698 | // Create the PHI node that indirect gotos will add entries to. |
Jay Foad | 20c0f02 | 2011-03-30 11:28:58 +0000 | [diff] [blame] | 1699 | llvm::Value *DestVal = TmpBuilder.CreatePHI(Int8PtrTy, 0, |
| 1700 | "indirect.goto.dest"); |
Michael Ilseman | 686240a | 2012-12-04 00:29:55 +0000 | [diff] [blame] | 1701 | |
Chris Lattner | 6c4d255 | 2009-10-28 23:59:40 +0000 | [diff] [blame] | 1702 | // Create the indirect branch instruction. |
| 1703 | IndirectBranch = TmpBuilder.CreateIndirectBr(DestVal); |
| 1704 | return IndirectBranch->getParent(); |
Daniel Dunbar | 88402ce | 2008-08-04 16:51:22 +0000 | [diff] [blame] | 1705 | } |
Anders Carlsson | 13abd7e | 2008-11-04 05:30:00 +0000 | [diff] [blame] | 1706 | |
John McCall | 82fe67b | 2011-07-09 01:37:26 +0000 | [diff] [blame] | 1707 | /// Computes the length of an array in elements, as well as the base |
| 1708 | /// element type and a properly-typed first element pointer. |
| 1709 | llvm::Value *CodeGenFunction::emitArrayLength(const ArrayType *origArrayType, |
| 1710 | QualType &baseType, |
John McCall | 7f416cc | 2015-09-08 08:05:57 +0000 | [diff] [blame] | 1711 | Address &addr) { |
John McCall | 82fe67b | 2011-07-09 01:37:26 +0000 | [diff] [blame] | 1712 | const ArrayType *arrayType = origArrayType; |
| 1713 | |
| 1714 | // If it's a VLA, we have to load the stored size. Note that |
| 1715 | // this is the size of the VLA in bytes, not its size in elements. |
Craig Topper | 8a13c41 | 2014-05-21 05:09:00 +0000 | [diff] [blame] | 1716 | llvm::Value *numVLAElements = nullptr; |
John McCall | 82fe67b | 2011-07-09 01:37:26 +0000 | [diff] [blame] | 1717 | if (isa<VariableArrayType>(arrayType)) { |
Sander de Smalen | 891af03a | 2018-02-03 13:55:59 +0000 | [diff] [blame] | 1718 | numVLAElements = getVLASize(cast<VariableArrayType>(arrayType)).NumElts; |
John McCall | 82fe67b | 2011-07-09 01:37:26 +0000 | [diff] [blame] | 1719 | |
| 1720 | // Walk into all VLAs. This doesn't require changes to addr, |
| 1721 | // which has type T* where T is the first non-VLA element type. |
| 1722 | do { |
| 1723 | QualType elementType = arrayType->getElementType(); |
| 1724 | arrayType = getContext().getAsArrayType(elementType); |
| 1725 | |
| 1726 | // If we only have VLA components, 'addr' requires no adjustment. |
| 1727 | if (!arrayType) { |
| 1728 | baseType = elementType; |
| 1729 | return numVLAElements; |
| 1730 | } |
| 1731 | } while (isa<VariableArrayType>(arrayType)); |
| 1732 | |
| 1733 | // We get out here only if we find a constant array type |
| 1734 | // inside the VLA. |
| 1735 | } |
| 1736 | |
| 1737 | // We have some number of constant-length arrays, so addr should |
| 1738 | // have LLVM type [M x [N x [...]]]*. Build a GEP that walks |
| 1739 | // down to the first element of addr. |
Chris Lattner | 0e62c1c | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 1740 | SmallVector<llvm::Value*, 8> gepIndices; |
John McCall | 82fe67b | 2011-07-09 01:37:26 +0000 | [diff] [blame] | 1741 | |
| 1742 | // GEP down to the array type. |
| 1743 | llvm::ConstantInt *zero = Builder.getInt32(0); |
| 1744 | gepIndices.push_back(zero); |
| 1745 | |
John McCall | 82fe67b | 2011-07-09 01:37:26 +0000 | [diff] [blame] | 1746 | uint64_t countFromCLAs = 1; |
Richard Smith | f3c37e8 | 2012-04-22 05:51:36 +0000 | [diff] [blame] | 1747 | QualType eltType; |
John McCall | 82fe67b | 2011-07-09 01:37:26 +0000 | [diff] [blame] | 1748 | |
Chris Lattner | 2192fe5 | 2011-07-18 04:24:23 +0000 | [diff] [blame] | 1749 | llvm::ArrayType *llvmArrayType = |
John McCall | 7f416cc | 2015-09-08 08:05:57 +0000 | [diff] [blame] | 1750 | dyn_cast<llvm::ArrayType>(addr.getElementType()); |
Richard Smith | f3c37e8 | 2012-04-22 05:51:36 +0000 | [diff] [blame] | 1751 | while (llvmArrayType) { |
John McCall | 82fe67b | 2011-07-09 01:37:26 +0000 | [diff] [blame] | 1752 | assert(isa<ConstantArrayType>(arrayType)); |
| 1753 | assert(cast<ConstantArrayType>(arrayType)->getSize().getZExtValue() |
| 1754 | == llvmArrayType->getNumElements()); |
| 1755 | |
| 1756 | gepIndices.push_back(zero); |
| 1757 | countFromCLAs *= llvmArrayType->getNumElements(); |
Richard Smith | f3c37e8 | 2012-04-22 05:51:36 +0000 | [diff] [blame] | 1758 | eltType = arrayType->getElementType(); |
John McCall | 82fe67b | 2011-07-09 01:37:26 +0000 | [diff] [blame] | 1759 | |
| 1760 | llvmArrayType = |
| 1761 | dyn_cast<llvm::ArrayType>(llvmArrayType->getElementType()); |
John McCall | 82fe67b | 2011-07-09 01:37:26 +0000 | [diff] [blame] | 1762 | arrayType = getContext().getAsArrayType(arrayType->getElementType()); |
Richard Smith | f3c37e8 | 2012-04-22 05:51:36 +0000 | [diff] [blame] | 1763 | assert((!llvmArrayType || arrayType) && |
| 1764 | "LLVM and Clang types are out-of-synch"); |
John McCall | 82fe67b | 2011-07-09 01:37:26 +0000 | [diff] [blame] | 1765 | } |
| 1766 | |
Richard Smith | f3c37e8 | 2012-04-22 05:51:36 +0000 | [diff] [blame] | 1767 | if (arrayType) { |
| 1768 | // From this point onwards, the Clang array type has been emitted |
| 1769 | // as some other type (probably a packed struct). Compute the array |
| 1770 | // size, and just emit the 'begin' expression as a bitcast. |
| 1771 | while (arrayType) { |
| 1772 | countFromCLAs *= |
| 1773 | cast<ConstantArrayType>(arrayType)->getSize().getZExtValue(); |
| 1774 | eltType = arrayType->getElementType(); |
| 1775 | arrayType = getContext().getAsArrayType(eltType); |
| 1776 | } |
John McCall | 82fe67b | 2011-07-09 01:37:26 +0000 | [diff] [blame] | 1777 | |
John McCall | 7f416cc | 2015-09-08 08:05:57 +0000 | [diff] [blame] | 1778 | llvm::Type *baseType = ConvertType(eltType); |
| 1779 | addr = Builder.CreateElementBitCast(addr, baseType, "array.begin"); |
Richard Smith | f3c37e8 | 2012-04-22 05:51:36 +0000 | [diff] [blame] | 1780 | } else { |
| 1781 | // Create the actual GEP. |
John McCall | 7f416cc | 2015-09-08 08:05:57 +0000 | [diff] [blame] | 1782 | addr = Address(Builder.CreateInBoundsGEP(addr.getPointer(), |
| 1783 | gepIndices, "array.begin"), |
| 1784 | addr.getAlignment()); |
Richard Smith | f3c37e8 | 2012-04-22 05:51:36 +0000 | [diff] [blame] | 1785 | } |
| 1786 | |
| 1787 | baseType = eltType; |
John McCall | 82fe67b | 2011-07-09 01:37:26 +0000 | [diff] [blame] | 1788 | |
| 1789 | llvm::Value *numElements |
| 1790 | = llvm::ConstantInt::get(SizeTy, countFromCLAs); |
| 1791 | |
| 1792 | // If we had any VLA dimensions, factor them in. |
| 1793 | if (numVLAElements) |
| 1794 | numElements = Builder.CreateNUWMul(numVLAElements, numElements); |
| 1795 | |
| 1796 | return numElements; |
| 1797 | } |
| 1798 | |
Sander de Smalen | 891af03a | 2018-02-03 13:55:59 +0000 | [diff] [blame] | 1799 | CodeGenFunction::VlaSizePair CodeGenFunction::getVLASize(QualType type) { |
John McCall | 23c29fe | 2011-06-24 21:55:10 +0000 | [diff] [blame] | 1800 | const VariableArrayType *vla = getContext().getAsVariableArrayType(type); |
| 1801 | assert(vla && "type was not a variable array type!"); |
| 1802 | return getVLASize(vla); |
Anders Carlsson | e388a5b | 2008-12-20 20:27:15 +0000 | [diff] [blame] | 1803 | } |
Anders Carlsson | ccbe920 | 2008-12-12 07:19:02 +0000 | [diff] [blame] | 1804 | |
Sander de Smalen | 891af03a | 2018-02-03 13:55:59 +0000 | [diff] [blame] | 1805 | CodeGenFunction::VlaSizePair |
John McCall | 23c29fe | 2011-06-24 21:55:10 +0000 | [diff] [blame] | 1806 | CodeGenFunction::getVLASize(const VariableArrayType *type) { |
| 1807 | // The number of elements so far; always size_t. |
Craig Topper | 8a13c41 | 2014-05-21 05:09:00 +0000 | [diff] [blame] | 1808 | llvm::Value *numElements = nullptr; |
John McCall | 23c29fe | 2011-06-24 21:55:10 +0000 | [diff] [blame] | 1809 | |
| 1810 | QualType elementType; |
| 1811 | do { |
| 1812 | elementType = type->getElementType(); |
| 1813 | llvm::Value *vlaSize = VLASizeMap[type->getSizeExpr()]; |
| 1814 | assert(vlaSize && "no size for VLA!"); |
| 1815 | assert(vlaSize->getType() == SizeTy); |
| 1816 | |
| 1817 | if (!numElements) { |
| 1818 | numElements = vlaSize; |
| 1819 | } else { |
| 1820 | // It's undefined behavior if this wraps around, so mark it that way. |
Alexey Samsonov | cb3f812 | 2014-03-20 10:48:29 +0000 | [diff] [blame] | 1821 | // FIXME: Teach -fsanitize=undefined to trap this. |
John McCall | 23c29fe | 2011-06-24 21:55:10 +0000 | [diff] [blame] | 1822 | numElements = Builder.CreateNUWMul(numElements, vlaSize); |
| 1823 | } |
| 1824 | } while ((type = getContext().getAsVariableArrayType(elementType))); |
| 1825 | |
Sander de Smalen | 891af03a | 2018-02-03 13:55:59 +0000 | [diff] [blame] | 1826 | return { numElements, elementType }; |
| 1827 | } |
| 1828 | |
| 1829 | CodeGenFunction::VlaSizePair |
| 1830 | CodeGenFunction::getVLAElements1D(QualType type) { |
| 1831 | const VariableArrayType *vla = getContext().getAsVariableArrayType(type); |
| 1832 | assert(vla && "type was not a variable array type!"); |
| 1833 | return getVLAElements1D(vla); |
| 1834 | } |
| 1835 | |
| 1836 | CodeGenFunction::VlaSizePair |
| 1837 | CodeGenFunction::getVLAElements1D(const VariableArrayType *Vla) { |
| 1838 | llvm::Value *VlaSize = VLASizeMap[Vla->getSizeExpr()]; |
| 1839 | assert(VlaSize && "no size for VLA!"); |
| 1840 | assert(VlaSize->getType() == SizeTy); |
| 1841 | return { VlaSize, Vla->getElementType() }; |
John McCall | 23c29fe | 2011-06-24 21:55:10 +0000 | [diff] [blame] | 1842 | } |
| 1843 | |
| 1844 | void CodeGenFunction::EmitVariablyModifiedType(QualType type) { |
| 1845 | assert(type->isVariablyModifiedType() && |
Anders Carlsson | 8a01b79 | 2008-12-20 20:46:34 +0000 | [diff] [blame] | 1846 | "Must pass variably modified type to EmitVLASizes!"); |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1847 | |
Daniel Dunbar | b6adc43 | 2009-07-19 06:58:07 +0000 | [diff] [blame] | 1848 | EnsureInsertPoint(); |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1849 | |
John McCall | 23c29fe | 2011-06-24 21:55:10 +0000 | [diff] [blame] | 1850 | // We're going to walk down into the type and look for VLA |
| 1851 | // expressions. |
John McCall | 23c29fe | 2011-06-24 21:55:10 +0000 | [diff] [blame] | 1852 | do { |
| 1853 | assert(type->isVariablyModifiedType()); |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1854 | |
John McCall | 23c29fe | 2011-06-24 21:55:10 +0000 | [diff] [blame] | 1855 | const Type *ty = type.getTypePtr(); |
| 1856 | switch (ty->getTypeClass()) { |
Abramo Bagnara | 1cd8368 | 2012-01-07 10:52:36 +0000 | [diff] [blame] | 1857 | |
John McCall | 23c29fe | 2011-06-24 21:55:10 +0000 | [diff] [blame] | 1858 | #define TYPE(Class, Base) |
| 1859 | #define ABSTRACT_TYPE(Class, Base) |
Abramo Bagnara | 1cd8368 | 2012-01-07 10:52:36 +0000 | [diff] [blame] | 1860 | #define NON_CANONICAL_TYPE(Class, Base) |
John McCall | 23c29fe | 2011-06-24 21:55:10 +0000 | [diff] [blame] | 1861 | #define DEPENDENT_TYPE(Class, Base) case Type::Class: |
Abramo Bagnara | 1cd8368 | 2012-01-07 10:52:36 +0000 | [diff] [blame] | 1862 | #define NON_CANONICAL_UNLESS_DEPENDENT_TYPE(Class, Base) |
John McCall | 23c29fe | 2011-06-24 21:55:10 +0000 | [diff] [blame] | 1863 | #include "clang/AST/TypeNodes.def" |
Abramo Bagnara | 1cd8368 | 2012-01-07 10:52:36 +0000 | [diff] [blame] | 1864 | llvm_unreachable("unexpected dependent type!"); |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1865 | |
John McCall | 23c29fe | 2011-06-24 21:55:10 +0000 | [diff] [blame] | 1866 | // These types are never variably-modified. |
| 1867 | case Type::Builtin: |
| 1868 | case Type::Complex: |
| 1869 | case Type::Vector: |
| 1870 | case Type::ExtVector: |
| 1871 | case Type::Record: |
| 1872 | case Type::Enum: |
Abramo Bagnara | fa95ed4 | 2012-01-11 08:19:46 +0000 | [diff] [blame] | 1873 | case Type::Elaborated: |
| 1874 | case Type::TemplateSpecialization: |
Manman Ren | e6be26c | 2016-09-13 17:25:08 +0000 | [diff] [blame] | 1875 | case Type::ObjCTypeParam: |
John McCall | 23c29fe | 2011-06-24 21:55:10 +0000 | [diff] [blame] | 1876 | case Type::ObjCObject: |
| 1877 | case Type::ObjCInterface: |
| 1878 | case Type::ObjCObjectPointer: |
| 1879 | llvm_unreachable("type class is never variably-modified!"); |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1880 | |
Reid Kleckner | 0503a87 | 2013-12-05 01:23:43 +0000 | [diff] [blame] | 1881 | case Type::Adjusted: |
| 1882 | type = cast<AdjustedType>(ty)->getAdjustedType(); |
| 1883 | break; |
| 1884 | |
Reid Kleckner | 8a36502 | 2013-06-24 17:51:48 +0000 | [diff] [blame] | 1885 | case Type::Decayed: |
| 1886 | type = cast<DecayedType>(ty)->getPointeeType(); |
| 1887 | break; |
| 1888 | |
John McCall | 23c29fe | 2011-06-24 21:55:10 +0000 | [diff] [blame] | 1889 | case Type::Pointer: |
| 1890 | type = cast<PointerType>(ty)->getPointeeType(); |
| 1891 | break; |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1892 | |
John McCall | 23c29fe | 2011-06-24 21:55:10 +0000 | [diff] [blame] | 1893 | case Type::BlockPointer: |
| 1894 | type = cast<BlockPointerType>(ty)->getPointeeType(); |
| 1895 | break; |
| 1896 | |
| 1897 | case Type::LValueReference: |
| 1898 | case Type::RValueReference: |
| 1899 | type = cast<ReferenceType>(ty)->getPointeeType(); |
| 1900 | break; |
| 1901 | |
| 1902 | case Type::MemberPointer: |
| 1903 | type = cast<MemberPointerType>(ty)->getPointeeType(); |
| 1904 | break; |
| 1905 | |
| 1906 | case Type::ConstantArray: |
| 1907 | case Type::IncompleteArray: |
| 1908 | // Losing element qualification here is fine. |
| 1909 | type = cast<ArrayType>(ty)->getElementType(); |
| 1910 | break; |
| 1911 | |
| 1912 | case Type::VariableArray: { |
| 1913 | // Losing element qualification here is fine. |
| 1914 | const VariableArrayType *vat = cast<VariableArrayType>(ty); |
| 1915 | |
| 1916 | // Unknown size indication requires no size computation. |
| 1917 | // Otherwise, evaluate and record it. |
| 1918 | if (const Expr *size = vat->getSizeExpr()) { |
| 1919 | // It's possible that we might have emitted this already, |
| 1920 | // e.g. with a typedef and a pointer to it. |
| 1921 | llvm::Value *&entry = VLASizeMap[size]; |
| 1922 | if (!entry) { |
Richard Smith | 481652b | 2012-10-10 01:11:12 +0000 | [diff] [blame] | 1923 | llvm::Value *Size = EmitScalarExpr(size); |
| 1924 | |
| 1925 | // C11 6.7.6.2p5: |
| 1926 | // If the size is an expression that is not an integer constant |
| 1927 | // expression [...] each time it is evaluated it shall have a value |
| 1928 | // greater than zero. |
Alexey Samsonov | edf99a9 | 2014-11-07 22:29:38 +0000 | [diff] [blame] | 1929 | if (SanOpts.has(SanitizerKind::VLABound) && |
Richard Smith | b1b0ab4 | 2012-11-05 22:21:05 +0000 | [diff] [blame] | 1930 | size->getType()->isSignedIntegerType()) { |
Alexey Samsonov | 24cad99 | 2014-07-17 18:46:27 +0000 | [diff] [blame] | 1931 | SanitizerScope SanScope(this); |
Richard Smith | 481652b | 2012-10-10 01:11:12 +0000 | [diff] [blame] | 1932 | llvm::Value *Zero = llvm::Constant::getNullValue(Size->getType()); |
| 1933 | llvm::Constant *StaticArgs[] = { |
Stephen Kelly | f2ceec4 | 2018-08-09 21:08:08 +0000 | [diff] [blame] | 1934 | EmitCheckSourceLocation(size->getBeginLoc()), |
| 1935 | EmitCheckTypeDescriptor(size->getType())}; |
Alexey Samsonov | e396bfc | 2014-11-11 22:03:54 +0000 | [diff] [blame] | 1936 | EmitCheck(std::make_pair(Builder.CreateICmpSGT(Size, Zero), |
| 1937 | SanitizerKind::VLABound), |
Filipe Cabecinhas | 322ecd9 | 2016-12-12 16:18:40 +0000 | [diff] [blame] | 1938 | SanitizerHandler::VLABoundNotPositive, StaticArgs, Size); |
Richard Smith | 481652b | 2012-10-10 01:11:12 +0000 | [diff] [blame] | 1939 | } |
| 1940 | |
John McCall | 23c29fe | 2011-06-24 21:55:10 +0000 | [diff] [blame] | 1941 | // Always zexting here would be wrong if it weren't |
| 1942 | // undefined behavior to have a negative bound. |
Richard Smith | 8772bd8 | 2012-10-10 01:12:11 +0000 | [diff] [blame] | 1943 | entry = Builder.CreateIntCast(Size, SizeTy, /*signed*/ false); |
John McCall | 23c29fe | 2011-06-24 21:55:10 +0000 | [diff] [blame] | 1944 | } |
| 1945 | } |
| 1946 | type = vat->getElementType(); |
| 1947 | break; |
Anders Carlsson | 8a01b79 | 2008-12-20 20:46:34 +0000 | [diff] [blame] | 1948 | } |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1949 | |
Abramo Bagnara | 1cd8368 | 2012-01-07 10:52:36 +0000 | [diff] [blame] | 1950 | case Type::FunctionProto: |
John McCall | 23c29fe | 2011-06-24 21:55:10 +0000 | [diff] [blame] | 1951 | case Type::FunctionNoProto: |
Alp Toker | 314cc81 | 2014-01-25 16:55:45 +0000 | [diff] [blame] | 1952 | type = cast<FunctionType>(ty)->getReturnType(); |
John McCall | 23c29fe | 2011-06-24 21:55:10 +0000 | [diff] [blame] | 1953 | break; |
Eli Friedman | 0dfb889 | 2011-10-06 23:00:33 +0000 | [diff] [blame] | 1954 | |
Abramo Bagnara | fa95ed4 | 2012-01-11 08:19:46 +0000 | [diff] [blame] | 1955 | case Type::Paren: |
| 1956 | case Type::TypeOf: |
| 1957 | case Type::UnaryTransform: |
| 1958 | case Type::Attributed: |
| 1959 | case Type::SubstTemplateTypeParm: |
David Blaikie | 66ed89d | 2013-07-13 21:08:08 +0000 | [diff] [blame] | 1960 | case Type::PackExpansion: |
Leonard Chan | c72aaf6 | 2019-05-07 03:20:17 +0000 | [diff] [blame] | 1961 | case Type::MacroQualified: |
Abramo Bagnara | fa95ed4 | 2012-01-11 08:19:46 +0000 | [diff] [blame] | 1962 | // Keep walking after single level desugaring. |
| 1963 | type = type.getSingleStepDesugaredType(getContext()); |
| 1964 | break; |
| 1965 | |
| 1966 | case Type::Typedef: |
| 1967 | case Type::Decltype: |
| 1968 | case Type::Auto: |
Richard Smith | 600b526 | 2017-01-26 20:40:47 +0000 | [diff] [blame] | 1969 | case Type::DeducedTemplateSpecialization: |
Abramo Bagnara | fa95ed4 | 2012-01-11 08:19:46 +0000 | [diff] [blame] | 1970 | // Stop walking: nothing to do. |
| 1971 | return; |
| 1972 | |
| 1973 | case Type::TypeOfExpr: |
| 1974 | // Stop walking: emit typeof expression. |
| 1975 | EmitIgnoredExpr(cast<TypeOfExprType>(ty)->getUnderlyingExpr()); |
| 1976 | return; |
| 1977 | |
Eli Friedman | 0dfb889 | 2011-10-06 23:00:33 +0000 | [diff] [blame] | 1978 | case Type::Atomic: |
| 1979 | type = cast<AtomicType>(ty)->getValueType(); |
| 1980 | break; |
Xiuli Pan | 9c14e28 | 2016-01-09 12:53:17 +0000 | [diff] [blame] | 1981 | |
| 1982 | case Type::Pipe: |
| 1983 | type = cast<PipeType>(ty)->getElementType(); |
| 1984 | break; |
John McCall | 23c29fe | 2011-06-24 21:55:10 +0000 | [diff] [blame] | 1985 | } |
| 1986 | } while (type->isVariablyModifiedType()); |
Anders Carlsson | ccbe920 | 2008-12-12 07:19:02 +0000 | [diff] [blame] | 1987 | } |
Eli Friedman | ddea0ad | 2009-01-20 17:46:04 +0000 | [diff] [blame] | 1988 | |
John McCall | 7f416cc | 2015-09-08 08:05:57 +0000 | [diff] [blame] | 1989 | Address CodeGenFunction::EmitVAListRef(const Expr* E) { |
Dan Gohman | e9e32dc | 2010-10-29 22:47:07 +0000 | [diff] [blame] | 1990 | if (getContext().getBuiltinVaListType()->isArrayType()) |
John McCall | 7f416cc | 2015-09-08 08:05:57 +0000 | [diff] [blame] | 1991 | return EmitPointerWithAlignment(E); |
Eli Friedman | ddea0ad | 2009-01-20 17:46:04 +0000 | [diff] [blame] | 1992 | return EmitLValue(E).getAddress(); |
| 1993 | } |
Anders Carlsson | 15cb75a | 2009-02-07 22:53:43 +0000 | [diff] [blame] | 1994 | |
Charles Davis | c7d5c94 | 2015-09-17 20:55:33 +0000 | [diff] [blame] | 1995 | Address CodeGenFunction::EmitMSVAListRef(const Expr *E) { |
| 1996 | return EmitLValue(E).getAddress(); |
| 1997 | } |
| 1998 | |
Yunzhong Gao | 0ebf1bb | 2013-08-30 08:53:09 +0000 | [diff] [blame] | 1999 | void CodeGenFunction::EmitDeclRefExprDbgValue(const DeclRefExpr *E, |
Peter Collingbourne | eeb56ab | 2016-09-13 01:13:19 +0000 | [diff] [blame] | 2000 | const APValue &Init) { |
Richard Smith | e637cbe | 2019-05-21 23:15:18 +0000 | [diff] [blame] | 2001 | assert(Init.hasValue() && "Invalid DeclRefExpr initializer!"); |
Yunzhong Gao | 0ebf1bb | 2013-08-30 08:53:09 +0000 | [diff] [blame] | 2002 | if (CGDebugInfo *Dbg = getDebugInfo()) |
Benjamin Kramer | 8c30592 | 2016-02-02 11:06:51 +0000 | [diff] [blame] | 2003 | if (CGM.getCodeGenOpts().getDebugInfo() >= codegenoptions::LimitedDebugInfo) |
Yunzhong Gao | 0ebf1bb | 2013-08-30 08:53:09 +0000 | [diff] [blame] | 2004 | Dbg->EmitGlobalVariable(E->getDecl(), Init); |
Devang Patel | e03edfd | 2010-08-10 07:24:25 +0000 | [diff] [blame] | 2005 | } |
John McCall | c07a0c7 | 2011-02-17 10:25:35 +0000 | [diff] [blame] | 2006 | |
| 2007 | CodeGenFunction::PeepholeProtection |
| 2008 | CodeGenFunction::protectFromPeepholes(RValue rvalue) { |
| 2009 | // At the moment, the only aggressive peephole we do in IR gen |
| 2010 | // is trunc(zext) folding, but if we add more, we can easily |
| 2011 | // extend this protection. |
| 2012 | |
| 2013 | if (!rvalue.isScalar()) return PeepholeProtection(); |
| 2014 | llvm::Value *value = rvalue.getScalarVal(); |
| 2015 | if (!isa<llvm::ZExtInst>(value)) return PeepholeProtection(); |
| 2016 | |
| 2017 | // Just make an extra bitcast. |
| 2018 | assert(HaveInsertPoint()); |
| 2019 | llvm::Instruction *inst = new llvm::BitCastInst(value, value->getType(), "", |
| 2020 | Builder.GetInsertBlock()); |
| 2021 | |
| 2022 | PeepholeProtection protection; |
| 2023 | protection.Inst = inst; |
| 2024 | return protection; |
| 2025 | } |
| 2026 | |
| 2027 | void CodeGenFunction::unprotectFromPeepholes(PeepholeProtection protection) { |
| 2028 | if (!protection.Inst) return; |
| 2029 | |
| 2030 | // In theory, we could try to duplicate the peepholes now, but whatever. |
| 2031 | protection.Inst->eraseFromParent(); |
| 2032 | } |
Julien Lerouge | 5a6b698 | 2011-09-09 22:41:49 +0000 | [diff] [blame] | 2033 | |
Roman Lebedev | bd1c087 | 2019-01-15 09:44:25 +0000 | [diff] [blame] | 2034 | void CodeGenFunction::EmitAlignmentAssumption(llvm::Value *PtrValue, |
| 2035 | QualType Ty, SourceLocation Loc, |
| 2036 | SourceLocation AssumptionLoc, |
| 2037 | llvm::Value *Alignment, |
| 2038 | llvm::Value *OffsetValue) { |
| 2039 | llvm::Value *TheCheck; |
| 2040 | llvm::Instruction *Assumption = Builder.CreateAlignmentAssumption( |
| 2041 | CGM.getDataLayout(), PtrValue, Alignment, OffsetValue, &TheCheck); |
| 2042 | if (SanOpts.has(SanitizerKind::Alignment)) { |
| 2043 | EmitAlignmentAssumptionCheck(PtrValue, Ty, Loc, AssumptionLoc, Alignment, |
| 2044 | OffsetValue, TheCheck, Assumption); |
| 2045 | } |
| 2046 | } |
| 2047 | |
| 2048 | void CodeGenFunction::EmitAlignmentAssumption(llvm::Value *PtrValue, |
| 2049 | QualType Ty, SourceLocation Loc, |
| 2050 | SourceLocation AssumptionLoc, |
| 2051 | unsigned Alignment, |
| 2052 | llvm::Value *OffsetValue) { |
| 2053 | llvm::Value *TheCheck; |
| 2054 | llvm::Instruction *Assumption = Builder.CreateAlignmentAssumption( |
| 2055 | CGM.getDataLayout(), PtrValue, Alignment, OffsetValue, &TheCheck); |
| 2056 | if (SanOpts.has(SanitizerKind::Alignment)) { |
| 2057 | llvm::Value *AlignmentVal = llvm::ConstantInt::get(IntPtrTy, Alignment); |
| 2058 | EmitAlignmentAssumptionCheck(PtrValue, Ty, Loc, AssumptionLoc, AlignmentVal, |
| 2059 | OffsetValue, TheCheck, Assumption); |
| 2060 | } |
| 2061 | } |
| 2062 | |
| 2063 | void CodeGenFunction::EmitAlignmentAssumption(llvm::Value *PtrValue, |
| 2064 | const Expr *E, |
| 2065 | SourceLocation AssumptionLoc, |
| 2066 | unsigned Alignment, |
| 2067 | llvm::Value *OffsetValue) { |
| 2068 | if (auto *CE = dyn_cast<CastExpr>(E)) |
| 2069 | E = CE->getSubExprAsWritten(); |
| 2070 | QualType Ty = E->getType(); |
| 2071 | SourceLocation Loc = E->getExprLoc(); |
| 2072 | |
| 2073 | EmitAlignmentAssumption(PtrValue, Ty, Loc, AssumptionLoc, Alignment, |
| 2074 | OffsetValue); |
| 2075 | } |
| 2076 | |
James Y Knight | 8799cae | 2019-02-03 21:53:49 +0000 | [diff] [blame] | 2077 | llvm::Value *CodeGenFunction::EmitAnnotationCall(llvm::Function *AnnotationFn, |
Julien Lerouge | 5a6b698 | 2011-09-09 22:41:49 +0000 | [diff] [blame] | 2078 | llvm::Value *AnnotatedVal, |
Dmitri Gribenko | f857950 | 2013-01-12 19:30:44 +0000 | [diff] [blame] | 2079 | StringRef AnnotationStr, |
Julien Lerouge | 5a6b698 | 2011-09-09 22:41:49 +0000 | [diff] [blame] | 2080 | SourceLocation Location) { |
| 2081 | llvm::Value *Args[4] = { |
| 2082 | AnnotatedVal, |
| 2083 | Builder.CreateBitCast(CGM.EmitAnnotationString(AnnotationStr), Int8PtrTy), |
| 2084 | Builder.CreateBitCast(CGM.EmitAnnotationUnit(Location), Int8PtrTy), |
| 2085 | CGM.EmitAnnotationLineNo(Location) |
| 2086 | }; |
| 2087 | return Builder.CreateCall(AnnotationFn, Args); |
| 2088 | } |
| 2089 | |
| 2090 | void CodeGenFunction::EmitVarAnnotations(const VarDecl *D, llvm::Value *V) { |
| 2091 | assert(D->hasAttr<AnnotateAttr>() && "no annotate attribute"); |
| 2092 | // FIXME We create a new bitcast for every annotation because that's what |
| 2093 | // llvm-gcc was doing. |
Aaron Ballman | be22bcb | 2014-03-10 17:08:28 +0000 | [diff] [blame] | 2094 | for (const auto *I : D->specific_attrs<AnnotateAttr>()) |
Julien Lerouge | 5a6b698 | 2011-09-09 22:41:49 +0000 | [diff] [blame] | 2095 | EmitAnnotationCall(CGM.getIntrinsic(llvm::Intrinsic::var_annotation), |
| 2096 | Builder.CreateBitCast(V, CGM.Int8PtrTy, V->getName()), |
Aaron Ballman | be22bcb | 2014-03-10 17:08:28 +0000 | [diff] [blame] | 2097 | I->getAnnotation(), D->getLocation()); |
Julien Lerouge | 5a6b698 | 2011-09-09 22:41:49 +0000 | [diff] [blame] | 2098 | } |
| 2099 | |
John McCall | 7f416cc | 2015-09-08 08:05:57 +0000 | [diff] [blame] | 2100 | Address CodeGenFunction::EmitFieldAnnotations(const FieldDecl *D, |
| 2101 | Address Addr) { |
Julien Lerouge | 5a6b698 | 2011-09-09 22:41:49 +0000 | [diff] [blame] | 2102 | assert(D->hasAttr<AnnotateAttr>() && "no annotate attribute"); |
John McCall | 7f416cc | 2015-09-08 08:05:57 +0000 | [diff] [blame] | 2103 | llvm::Value *V = Addr.getPointer(); |
Julien Lerouge | 5a6b698 | 2011-09-09 22:41:49 +0000 | [diff] [blame] | 2104 | llvm::Type *VTy = V->getType(); |
James Y Knight | 8799cae | 2019-02-03 21:53:49 +0000 | [diff] [blame] | 2105 | llvm::Function *F = CGM.getIntrinsic(llvm::Intrinsic::ptr_annotation, |
Julien Lerouge | 5a6b698 | 2011-09-09 22:41:49 +0000 | [diff] [blame] | 2106 | CGM.Int8PtrTy); |
| 2107 | |
Aaron Ballman | be22bcb | 2014-03-10 17:08:28 +0000 | [diff] [blame] | 2108 | for (const auto *I : D->specific_attrs<AnnotateAttr>()) { |
Julien Lerouge | 5a6b698 | 2011-09-09 22:41:49 +0000 | [diff] [blame] | 2109 | // FIXME Always emit the cast inst so we can differentiate between |
| 2110 | // annotation on the first field of a struct and annotation on the struct |
| 2111 | // itself. |
| 2112 | if (VTy != CGM.Int8PtrTy) |
Erich Keane | 2a4eea3 | 2018-12-18 16:22:21 +0000 | [diff] [blame] | 2113 | V = Builder.CreateBitCast(V, CGM.Int8PtrTy); |
Aaron Ballman | be22bcb | 2014-03-10 17:08:28 +0000 | [diff] [blame] | 2114 | V = EmitAnnotationCall(F, V, I->getAnnotation(), D->getLocation()); |
Julien Lerouge | 5a6b698 | 2011-09-09 22:41:49 +0000 | [diff] [blame] | 2115 | V = Builder.CreateBitCast(V, VTy); |
| 2116 | } |
| 2117 | |
John McCall | 7f416cc | 2015-09-08 08:05:57 +0000 | [diff] [blame] | 2118 | return Address(V, Addr.getAlignment()); |
Julien Lerouge | 5a6b698 | 2011-09-09 22:41:49 +0000 | [diff] [blame] | 2119 | } |
Ben Langmuir | 3b4c30b | 2013-05-09 19:17:11 +0000 | [diff] [blame] | 2120 | |
Angel Garcia Gomez | 637d1e6 | 2015-10-20 13:23:58 +0000 | [diff] [blame] | 2121 | CodeGenFunction::CGCapturedStmtInfo::~CGCapturedStmtInfo() { } |
Alexander Musman | 515ad8c | 2014-05-22 08:54:05 +0000 | [diff] [blame] | 2122 | |
Alexey Samsonov | 24cad99 | 2014-07-17 18:46:27 +0000 | [diff] [blame] | 2123 | CodeGenFunction::SanitizerScope::SanitizerScope(CodeGenFunction *CGF) |
| 2124 | : CGF(CGF) { |
| 2125 | assert(!CGF->IsSanitizerScope); |
| 2126 | CGF->IsSanitizerScope = true; |
| 2127 | } |
| 2128 | |
| 2129 | CodeGenFunction::SanitizerScope::~SanitizerScope() { |
| 2130 | CGF->IsSanitizerScope = false; |
| 2131 | } |
| 2132 | |
Alexander Musman | 515ad8c | 2014-05-22 08:54:05 +0000 | [diff] [blame] | 2133 | void CodeGenFunction::InsertHelper(llvm::Instruction *I, |
| 2134 | const llvm::Twine &Name, |
| 2135 | llvm::BasicBlock *BB, |
| 2136 | llvm::BasicBlock::iterator InsertPt) const { |
| 2137 | LoopStack.InsertHelper(I); |
Kostya Serebryany | 4ee6904 | 2014-08-26 02:29:59 +0000 | [diff] [blame] | 2138 | if (IsSanitizerScope) |
| 2139 | CGM.getSanitizerMetadata()->disableSanitizerForInstruction(I); |
Alexander Musman | 515ad8c | 2014-05-22 08:54:05 +0000 | [diff] [blame] | 2140 | } |
| 2141 | |
Mehdi Amini | 557c20a | 2016-03-13 21:05:23 +0000 | [diff] [blame] | 2142 | void CGBuilderInserter::InsertHelper( |
Alexander Musman | 515ad8c | 2014-05-22 08:54:05 +0000 | [diff] [blame] | 2143 | llvm::Instruction *I, const llvm::Twine &Name, llvm::BasicBlock *BB, |
| 2144 | llvm::BasicBlock::iterator InsertPt) const { |
Mehdi Amini | 557c20a | 2016-03-13 21:05:23 +0000 | [diff] [blame] | 2145 | llvm::IRBuilderDefaultInserter::InsertHelper(I, Name, BB, InsertPt); |
Alexander Musman | 515ad8c | 2014-05-22 08:54:05 +0000 | [diff] [blame] | 2146 | if (CGF) |
| 2147 | CGF->InsertHelper(I, Name, BB, InsertPt); |
| 2148 | } |
| 2149 | |
David Blaikie | 5df25338 | 2015-11-12 01:09:58 +0000 | [diff] [blame] | 2150 | static bool hasRequiredFeatures(const SmallVectorImpl<StringRef> &ReqFeatures, |
Eric Christopher | ce83677 | 2015-11-14 02:38:37 +0000 | [diff] [blame] | 2151 | CodeGenModule &CGM, const FunctionDecl *FD, |
| 2152 | std::string &FirstMissing) { |
David Blaikie | 5df25338 | 2015-11-12 01:09:58 +0000 | [diff] [blame] | 2153 | // If there aren't any required features listed then go ahead and return. |
| 2154 | if (ReqFeatures.empty()) |
| 2155 | return false; |
| 2156 | |
| 2157 | // Now build up the set of caller features and verify that all the required |
| 2158 | // features are there. |
| 2159 | llvm::StringMap<bool> CallerFeatureMap; |
Erich Keane | de6480a3 | 2018-11-13 15:48:08 +0000 | [diff] [blame] | 2160 | CGM.getFunctionFeatureMap(CallerFeatureMap, GlobalDecl().getWithDecl(FD)); |
David Blaikie | 5df25338 | 2015-11-12 01:09:58 +0000 | [diff] [blame] | 2161 | |
| 2162 | // If we have at least one of the features in the feature list return |
| 2163 | // true, otherwise return false. |
| 2164 | return std::all_of( |
| 2165 | ReqFeatures.begin(), ReqFeatures.end(), [&](StringRef Feature) { |
| 2166 | SmallVector<StringRef, 1> OrFeatures; |
Craig Topper | 274506d | 2018-05-03 21:01:33 +0000 | [diff] [blame] | 2167 | Feature.split(OrFeatures, '|'); |
Fangrui Song | 3117b17 | 2018-10-20 17:53:42 +0000 | [diff] [blame] | 2168 | return llvm::any_of(OrFeatures, [&](StringRef Feature) { |
| 2169 | if (!CallerFeatureMap.lookup(Feature)) { |
| 2170 | FirstMissing = Feature.str(); |
| 2171 | return false; |
| 2172 | } |
| 2173 | return true; |
| 2174 | }); |
David Blaikie | 5df25338 | 2015-11-12 01:09:58 +0000 | [diff] [blame] | 2175 | }); |
| 2176 | } |
| 2177 | |
Eric Christopher | 2b2d56f | 2015-11-12 00:44:12 +0000 | [diff] [blame] | 2178 | // Emits an error if we don't have a valid set of target features for the |
| 2179 | // called function. |
Eric Christopher | fbfd97e | 2015-11-12 00:44:07 +0000 | [diff] [blame] | 2180 | void CodeGenFunction::checkTargetFeatures(const CallExpr *E, |
| 2181 | const FunctionDecl *TargetDecl) { |
| 2182 | // Early exit if this is an indirect call. |
| 2183 | if (!TargetDecl) |
| 2184 | return; |
| 2185 | |
| 2186 | // Get the current enclosing function if it exists. If it doesn't |
| 2187 | // we can't check the target features anyhow. |
| 2188 | const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(CurFuncDecl); |
| 2189 | if (!FD) |
| 2190 | return; |
| 2191 | |
Eric Christopher | 2b2d56f | 2015-11-12 00:44:12 +0000 | [diff] [blame] | 2192 | // Grab the required features for the call. For a builtin this is listed in |
| 2193 | // the td file with the default cpu, for an always_inline function this is any |
| 2194 | // listed cpu and any listed features. |
Eric Christopher | fbfd97e | 2015-11-12 00:44:07 +0000 | [diff] [blame] | 2195 | unsigned BuiltinID = TargetDecl->getBuiltinID(); |
Eric Christopher | ce83677 | 2015-11-14 02:38:37 +0000 | [diff] [blame] | 2196 | std::string MissingFeature; |
Eric Christopher | 2b2d56f | 2015-11-12 00:44:12 +0000 | [diff] [blame] | 2197 | if (BuiltinID) { |
| 2198 | SmallVector<StringRef, 1> ReqFeatures; |
| 2199 | const char *FeatureList = |
| 2200 | CGM.getContext().BuiltinInfo.getRequiredFeatures(BuiltinID); |
| 2201 | // Return if the builtin doesn't have any required features. |
| 2202 | if (!FeatureList || StringRef(FeatureList) == "") |
| 2203 | return; |
Craig Topper | 274506d | 2018-05-03 21:01:33 +0000 | [diff] [blame] | 2204 | StringRef(FeatureList).split(ReqFeatures, ','); |
Eric Christopher | ce83677 | 2015-11-14 02:38:37 +0000 | [diff] [blame] | 2205 | if (!hasRequiredFeatures(ReqFeatures, CGM, FD, MissingFeature)) |
Stephen Kelly | f2ceec4 | 2018-08-09 21:08:08 +0000 | [diff] [blame] | 2206 | CGM.getDiags().Report(E->getBeginLoc(), diag::err_builtin_needs_feature) |
Eric Christopher | 2b2d56f | 2015-11-12 00:44:12 +0000 | [diff] [blame] | 2207 | << TargetDecl->getDeclName() |
| 2208 | << CGM.getContext().BuiltinInfo.getRequiredFeatures(BuiltinID); |
| 2209 | |
Erich Keane | 3efe002 | 2018-07-20 14:13:28 +0000 | [diff] [blame] | 2210 | } else if (TargetDecl->hasAttr<TargetAttr>() || |
| 2211 | TargetDecl->hasAttr<CPUSpecificAttr>()) { |
Eric Christopher | 2b2d56f | 2015-11-12 00:44:12 +0000 | [diff] [blame] | 2212 | // Get the required features for the callee. |
Gabor Buella | 1a83d06 | 2018-06-07 08:48:36 +0000 | [diff] [blame] | 2213 | |
| 2214 | const TargetAttr *TD = TargetDecl->getAttr<TargetAttr>(); |
| 2215 | TargetAttr::ParsedTargetAttr ParsedAttr = CGM.filterFunctionTargetAttrs(TD); |
| 2216 | |
Eric Christopher | 2b2d56f | 2015-11-12 00:44:12 +0000 | [diff] [blame] | 2217 | SmallVector<StringRef, 1> ReqFeatures; |
| 2218 | llvm::StringMap<bool> CalleeFeatureMap; |
| 2219 | CGM.getFunctionFeatureMap(CalleeFeatureMap, TargetDecl); |
Gabor Buella | 1a83d06 | 2018-06-07 08:48:36 +0000 | [diff] [blame] | 2220 | |
| 2221 | for (const auto &F : ParsedAttr.Features) { |
| 2222 | if (F[0] == '+' && CalleeFeatureMap.lookup(F.substr(1))) |
| 2223 | ReqFeatures.push_back(StringRef(F).substr(1)); |
| 2224 | } |
| 2225 | |
Eric Christopher | b7bbc53 | 2015-11-16 18:29:59 +0000 | [diff] [blame] | 2226 | for (const auto &F : CalleeFeatureMap) { |
| 2227 | // Only positive features are "required". |
| 2228 | if (F.getValue()) |
| 2229 | ReqFeatures.push_back(F.getKey()); |
| 2230 | } |
Eric Christopher | ce83677 | 2015-11-14 02:38:37 +0000 | [diff] [blame] | 2231 | if (!hasRequiredFeatures(ReqFeatures, CGM, FD, MissingFeature)) |
Stephen Kelly | f2ceec4 | 2018-08-09 21:08:08 +0000 | [diff] [blame] | 2232 | CGM.getDiags().Report(E->getBeginLoc(), diag::err_function_needs_feature) |
Eric Christopher | ce83677 | 2015-11-14 02:38:37 +0000 | [diff] [blame] | 2233 | << FD->getDeclName() << TargetDecl->getDeclName() << MissingFeature; |
Eric Christopher | 2b2d56f | 2015-11-12 00:44:12 +0000 | [diff] [blame] | 2234 | } |
Eric Christopher | fbfd97e | 2015-11-12 00:44:07 +0000 | [diff] [blame] | 2235 | } |
Peter Collingbourne | dc13453 | 2016-01-16 00:31:22 +0000 | [diff] [blame] | 2236 | |
| 2237 | void CodeGenFunction::EmitSanitizerStatReport(llvm::SanitizerStatKind SSK) { |
| 2238 | if (!CGM.getCodeGenOpts().SanitizeStats) |
| 2239 | return; |
| 2240 | |
| 2241 | llvm::IRBuilder<> IRB(Builder.GetInsertBlock(), Builder.GetInsertPoint()); |
| 2242 | IRB.SetCurrentDebugLocation(Builder.getCurrentDebugLocation()); |
| 2243 | CGM.getSanStats().create(IRB, SSK); |
| 2244 | } |
Amara Emerson | 652795d | 2016-11-10 14:44:30 +0000 | [diff] [blame] | 2245 | |
Erich Keane | f353ae1 | 2018-09-13 16:58:24 +0000 | [diff] [blame] | 2246 | llvm::Value * |
| 2247 | CodeGenFunction::FormResolverCondition(const MultiVersionResolverOption &RO) { |
| 2248 | llvm::Value *Condition = nullptr; |
Erich Keane | 281d20b | 2018-01-08 21:34:17 +0000 | [diff] [blame] | 2249 | |
Erich Keane | f353ae1 | 2018-09-13 16:58:24 +0000 | [diff] [blame] | 2250 | if (!RO.Conditions.Architecture.empty()) |
| 2251 | Condition = EmitX86CpuIs(RO.Conditions.Architecture); |
| 2252 | |
| 2253 | if (!RO.Conditions.Features.empty()) { |
| 2254 | llvm::Value *FeatureCond = EmitX86CpuSupports(RO.Conditions.Features); |
| 2255 | Condition = |
| 2256 | Condition ? Builder.CreateAnd(Condition, FeatureCond) : FeatureCond; |
Erich Keane | 281d20b | 2018-01-08 21:34:17 +0000 | [diff] [blame] | 2257 | } |
Erich Keane | f353ae1 | 2018-09-13 16:58:24 +0000 | [diff] [blame] | 2258 | return Condition; |
Erich Keane | 281d20b | 2018-01-08 21:34:17 +0000 | [diff] [blame] | 2259 | } |
| 2260 | |
Erich Keane | 19a8adc | 2018-10-25 18:57:19 +0000 | [diff] [blame] | 2261 | static void CreateMultiVersionResolverReturn(CodeGenModule &CGM, |
| 2262 | llvm::Function *Resolver, |
| 2263 | CGBuilderTy &Builder, |
| 2264 | llvm::Function *FuncToReturn, |
| 2265 | bool SupportsIFunc) { |
| 2266 | if (SupportsIFunc) { |
| 2267 | Builder.CreateRet(FuncToReturn); |
| 2268 | return; |
| 2269 | } |
| 2270 | |
| 2271 | llvm::SmallVector<llvm::Value *, 10> Args; |
| 2272 | llvm::for_each(Resolver->args(), |
| 2273 | [&](llvm::Argument &Arg) { Args.push_back(&Arg); }); |
| 2274 | |
| 2275 | llvm::CallInst *Result = Builder.CreateCall(FuncToReturn, Args); |
| 2276 | Result->setTailCallKind(llvm::CallInst::TCK_MustTail); |
| 2277 | |
| 2278 | if (Resolver->getReturnType()->isVoidTy()) |
| 2279 | Builder.CreateRetVoid(); |
| 2280 | else |
| 2281 | Builder.CreateRet(Result); |
| 2282 | } |
| 2283 | |
Erich Keane | f353ae1 | 2018-09-13 16:58:24 +0000 | [diff] [blame] | 2284 | void CodeGenFunction::EmitMultiVersionResolver( |
| 2285 | llvm::Function *Resolver, ArrayRef<MultiVersionResolverOption> Options) { |
Erich Keane | 281d20b | 2018-01-08 21:34:17 +0000 | [diff] [blame] | 2286 | assert((getContext().getTargetInfo().getTriple().getArch() == |
| 2287 | llvm::Triple::x86 || |
| 2288 | getContext().getTargetInfo().getTriple().getArch() == |
| 2289 | llvm::Triple::x86_64) && |
| 2290 | "Only implemented for x86 targets"); |
Erich Keane | 19a8adc | 2018-10-25 18:57:19 +0000 | [diff] [blame] | 2291 | |
| 2292 | bool SupportsIFunc = getContext().getTargetInfo().supportsIFunc(); |
| 2293 | |
Erich Keane | 3efe002 | 2018-07-20 14:13:28 +0000 | [diff] [blame] | 2294 | // Main function's basic block. |
| 2295 | llvm::BasicBlock *CurBlock = createBasicBlock("resolver_entry", Resolver); |
| 2296 | Builder.SetInsertPoint(CurBlock); |
| 2297 | EmitX86CpuInit(); |
| 2298 | |
Erich Keane | f353ae1 | 2018-09-13 16:58:24 +0000 | [diff] [blame] | 2299 | for (const MultiVersionResolverOption &RO : Options) { |
Erich Keane | 3efe002 | 2018-07-20 14:13:28 +0000 | [diff] [blame] | 2300 | Builder.SetInsertPoint(CurBlock); |
Erich Keane | f353ae1 | 2018-09-13 16:58:24 +0000 | [diff] [blame] | 2301 | llvm::Value *Condition = FormResolverCondition(RO); |
Erich Keane | 3efe002 | 2018-07-20 14:13:28 +0000 | [diff] [blame] | 2302 | |
Erich Keane | f353ae1 | 2018-09-13 16:58:24 +0000 | [diff] [blame] | 2303 | // The 'default' or 'generic' case. |
| 2304 | if (!Condition) { |
| 2305 | assert(&RO == Options.end() - 1 && |
| 2306 | "Default or Generic case must be last"); |
Erich Keane | 19a8adc | 2018-10-25 18:57:19 +0000 | [diff] [blame] | 2307 | CreateMultiVersionResolverReturn(CGM, Resolver, Builder, RO.Function, |
| 2308 | SupportsIFunc); |
Erich Keane | 3efe002 | 2018-07-20 14:13:28 +0000 | [diff] [blame] | 2309 | return; |
| 2310 | } |
Erich Keane | f353ae1 | 2018-09-13 16:58:24 +0000 | [diff] [blame] | 2311 | |
Erich Keane | 3efe002 | 2018-07-20 14:13:28 +0000 | [diff] [blame] | 2312 | llvm::BasicBlock *RetBlock = createBasicBlock("resolver_return", Resolver); |
Erich Keane | 19a8adc | 2018-10-25 18:57:19 +0000 | [diff] [blame] | 2313 | CGBuilderTy RetBuilder(*this, RetBlock); |
| 2314 | CreateMultiVersionResolverReturn(CGM, Resolver, RetBuilder, RO.Function, |
| 2315 | SupportsIFunc); |
Erich Keane | 3efe002 | 2018-07-20 14:13:28 +0000 | [diff] [blame] | 2316 | CurBlock = createBasicBlock("resolver_else", Resolver); |
Erich Keane | f353ae1 | 2018-09-13 16:58:24 +0000 | [diff] [blame] | 2317 | Builder.CreateCondBr(Condition, RetBlock, CurBlock); |
Erich Keane | 3efe002 | 2018-07-20 14:13:28 +0000 | [diff] [blame] | 2318 | } |
| 2319 | |
Erich Keane | f353ae1 | 2018-09-13 16:58:24 +0000 | [diff] [blame] | 2320 | // If no generic/default, emit an unreachable. |
Erich Keane | 3efe002 | 2018-07-20 14:13:28 +0000 | [diff] [blame] | 2321 | Builder.SetInsertPoint(CurBlock); |
| 2322 | llvm::CallInst *TrapCall = EmitTrapCall(llvm::Intrinsic::trap); |
| 2323 | TrapCall->setDoesNotReturn(); |
| 2324 | TrapCall->setDoesNotThrow(); |
| 2325 | Builder.CreateUnreachable(); |
| 2326 | Builder.ClearInsertionPoint(); |
| 2327 | } |
| 2328 | |
Roman Lebedev | bd1c087 | 2019-01-15 09:44:25 +0000 | [diff] [blame] | 2329 | // Loc - where the diagnostic will point, where in the source code this |
| 2330 | // alignment has failed. |
| 2331 | // SecondaryLoc - if present (will be present if sufficiently different from |
| 2332 | // Loc), the diagnostic will additionally point a "Note:" to this location. |
| 2333 | // It should be the location where the __attribute__((assume_aligned)) |
| 2334 | // was written e.g. |
| 2335 | void CodeGenFunction::EmitAlignmentAssumptionCheck( |
| 2336 | llvm::Value *Ptr, QualType Ty, SourceLocation Loc, |
| 2337 | SourceLocation SecondaryLoc, llvm::Value *Alignment, |
| 2338 | llvm::Value *OffsetValue, llvm::Value *TheCheck, |
| 2339 | llvm::Instruction *Assumption) { |
| 2340 | assert(Assumption && isa<llvm::CallInst>(Assumption) && |
| 2341 | cast<llvm::CallInst>(Assumption)->getCalledValue() == |
| 2342 | llvm::Intrinsic::getDeclaration( |
| 2343 | Builder.GetInsertBlock()->getParent()->getParent(), |
| 2344 | llvm::Intrinsic::assume) && |
| 2345 | "Assumption should be a call to llvm.assume()."); |
| 2346 | assert(&(Builder.GetInsertBlock()->back()) == Assumption && |
| 2347 | "Assumption should be the last instruction of the basic block, " |
| 2348 | "since the basic block is still being generated."); |
| 2349 | |
| 2350 | if (!SanOpts.has(SanitizerKind::Alignment)) |
| 2351 | return; |
| 2352 | |
| 2353 | // Don't check pointers to volatile data. The behavior here is implementation- |
| 2354 | // defined. |
| 2355 | if (Ty->getPointeeType().isVolatileQualified()) |
| 2356 | return; |
| 2357 | |
| 2358 | // We need to temorairly remove the assumption so we can insert the |
| 2359 | // sanitizer check before it, else the check will be dropped by optimizations. |
| 2360 | Assumption->removeFromParent(); |
| 2361 | |
| 2362 | { |
| 2363 | SanitizerScope SanScope(this); |
| 2364 | |
| 2365 | if (!OffsetValue) |
| 2366 | OffsetValue = Builder.getInt1(0); // no offset. |
| 2367 | |
| 2368 | llvm::Constant *StaticData[] = {EmitCheckSourceLocation(Loc), |
| 2369 | EmitCheckSourceLocation(SecondaryLoc), |
| 2370 | EmitCheckTypeDescriptor(Ty)}; |
| 2371 | llvm::Value *DynamicData[] = {EmitCheckValue(Ptr), |
| 2372 | EmitCheckValue(Alignment), |
| 2373 | EmitCheckValue(OffsetValue)}; |
| 2374 | EmitCheck({std::make_pair(TheCheck, SanitizerKind::Alignment)}, |
| 2375 | SanitizerHandler::AlignmentAssumption, StaticData, DynamicData); |
| 2376 | } |
| 2377 | |
| 2378 | // We are now in the (new, empty) "cont" basic block. |
| 2379 | // Reintroduce the assumption. |
| 2380 | Builder.Insert(Assumption); |
| 2381 | // FIXME: Assumption still has it's original basic block as it's Parent. |
| 2382 | } |
| 2383 | |
Amara Emerson | 652795d | 2016-11-10 14:44:30 +0000 | [diff] [blame] | 2384 | llvm::DebugLoc CodeGenFunction::SourceLocToDebugLoc(SourceLocation Location) { |
| 2385 | if (CGDebugInfo *DI = getDebugInfo()) |
| 2386 | return DI->SourceLocToDebugLoc(Location); |
| 2387 | |
| 2388 | return llvm::DebugLoc(); |
| 2389 | } |