Chris Lattner | bed3144 | 2007-05-28 01:07:47 +0000 | [diff] [blame] | 1 | //===--- CodeGenFunction.cpp - Emit LLVM Code from ASTs for a Function ----===// |
| 2 | // |
| 3 | // The LLVM Compiler Infrastructure |
| 4 | // |
Chris Lattner | 5b12ab8 | 2007-12-29 19:59:25 +0000 | [diff] [blame] | 5 | // This file is distributed under the University of Illinois Open Source |
| 6 | // License. See LICENSE.TXT for details. |
Chris Lattner | bed3144 | 2007-05-28 01:07:47 +0000 | [diff] [blame] | 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | // |
| 10 | // This coordinates the per-function state used while generating code. |
| 11 | // |
| 12 | //===----------------------------------------------------------------------===// |
| 13 | |
| 14 | #include "CodeGenFunction.h" |
Peter Collingbourne | fa4d603 | 2011-10-06 18:51:56 +0000 | [diff] [blame] | 15 | #include "CGCUDARuntime.h" |
John McCall | 5d865c32 | 2010-08-31 07:33:07 +0000 | [diff] [blame] | 16 | #include "CGCXXABI.h" |
Eli Friedman | 1763075 | 2008-05-22 01:40:10 +0000 | [diff] [blame] | 17 | #include "CGDebugInfo.h" |
Alexey Bataev | 9959db5 | 2014-05-06 10:08:46 +0000 | [diff] [blame] | 18 | #include "CGOpenMPRuntime.h" |
Chandler Carruth | 3a02247 | 2012-12-04 09:13:33 +0000 | [diff] [blame] | 19 | #include "CodeGenModule.h" |
Justin Bogner | ef512b9 | 2014-01-06 22:27:43 +0000 | [diff] [blame] | 20 | #include "CodeGenPGO.h" |
Peter Collingbourne | b453cd6 | 2013-10-20 21:29:19 +0000 | [diff] [blame] | 21 | #include "TargetInfo.h" |
Daniel Dunbar | ad319a7 | 2008-08-11 05:00:27 +0000 | [diff] [blame] | 22 | #include "clang/AST/ASTContext.h" |
Daniel Dunbar | 6e8aa53 | 2008-08-11 05:35:13 +0000 | [diff] [blame] | 23 | #include "clang/AST/Decl.h" |
Anders Carlsson | 468fa63 | 2009-04-04 20:47:02 +0000 | [diff] [blame] | 24 | #include "clang/AST/DeclCXX.h" |
Mike Stump | bee78dd | 2009-12-04 23:26:17 +0000 | [diff] [blame] | 25 | #include "clang/AST/StmtCXX.h" |
Chandler Carruth | 3a02247 | 2012-12-04 09:13:33 +0000 | [diff] [blame] | 26 | #include "clang/Basic/TargetInfo.h" |
Mark Lacey | a8e7df3 | 2013-10-30 21:53:58 +0000 | [diff] [blame] | 27 | #include "clang/CodeGen/CGFunctionInfo.h" |
Chris Lattner | 3c77a35 | 2010-06-22 00:03:40 +0000 | [diff] [blame] | 28 | #include "clang/Frontend/CodeGenOptions.h" |
Chandler Carruth | ffd5551 | 2013-01-02 11:45:17 +0000 | [diff] [blame] | 29 | #include "llvm/IR/DataLayout.h" |
| 30 | #include "llvm/IR/Intrinsics.h" |
| 31 | #include "llvm/IR/MDBuilder.h" |
| 32 | #include "llvm/IR/Operator.h" |
Chris Lattner | bed3144 | 2007-05-28 01:07:47 +0000 | [diff] [blame] | 33 | using namespace clang; |
| 34 | using namespace CodeGen; |
| 35 | |
Fariborz Jahanian | 6362803 | 2012-06-26 16:06:38 +0000 | [diff] [blame] | 36 | CodeGenFunction::CodeGenFunction(CodeGenModule &cgm, bool suppressNewContext) |
David Blaikie | 92848de | 2013-08-26 20:33:21 +0000 | [diff] [blame] | 37 | : CodeGenTypeCache(cgm), CGM(cgm), Target(cgm.getTarget()), |
| 38 | Builder(cgm.getModule().getContext()), CapturedStmtInfo(0), |
| 39 | SanitizePerformTypeCheck(CGM.getSanOpts().Null | |
| 40 | CGM.getSanOpts().Alignment | |
| 41 | CGM.getSanOpts().ObjectSize | |
| 42 | CGM.getSanOpts().Vptr), |
| 43 | SanOpts(&CGM.getSanOpts()), AutoreleaseResult(false), BlockInfo(0), |
| 44 | BlockPointer(0), LambdaThisCaptureField(0), NormalCleanupDest(0), |
| 45 | NextCleanupDestIndex(1), FirstBlockInfo(0), EHResumeBlock(0), |
| 46 | ExceptionSlot(0), EHSelectorSlot(0), DebugInfo(CGM.getModuleDebugInfo()), |
| 47 | DisableDebugInfo(false), DidCallStackSave(false), IndirectBranch(0), |
Justin Bogner | ef512b9 | 2014-01-06 22:27:43 +0000 | [diff] [blame] | 48 | PGO(cgm), SwitchInsn(0), SwitchWeights(0), |
| 49 | CaseRangeBlock(0), UnreachableBlock(0), NumReturnExprs(0), |
David Blaikie | 92848de | 2013-08-26 20:33:21 +0000 | [diff] [blame] | 50 | NumSimpleReturnExprs(0), CXXABIThisDecl(0), CXXABIThisValue(0), |
| 51 | CXXThisValue(0), CXXDefaultInitExprThis(0), |
| 52 | CXXStructorImplicitParamDecl(0), CXXStructorImplicitParamValue(0), |
| 53 | OutermostConditional(0), CurLexicalScope(0), TerminateLandingPad(0), |
| 54 | TerminateHandler(0), TrapBB(0) { |
Fariborz Jahanian | 6362803 | 2012-06-26 16:06:38 +0000 | [diff] [blame] | 55 | if (!suppressNewContext) |
| 56 | CGM.getCXXABI().getMangleContext().startNewFunction(); |
Michael Ilseman | 7a167ee | 2012-12-04 00:36:06 +0000 | [diff] [blame] | 57 | |
| 58 | llvm::FastMathFlags FMF; |
| 59 | if (CGM.getLangOpts().FastMath) |
Benjamin Kramer | 7464efc | 2012-12-09 21:58:24 +0000 | [diff] [blame] | 60 | FMF.setUnsafeAlgebra(); |
Michael Ilseman | 7a167ee | 2012-12-04 00:36:06 +0000 | [diff] [blame] | 61 | if (CGM.getLangOpts().FiniteMathOnly) { |
Benjamin Kramer | 7464efc | 2012-12-09 21:58:24 +0000 | [diff] [blame] | 62 | FMF.setNoNaNs(); |
| 63 | FMF.setNoInfs(); |
Michael Ilseman | 7a167ee | 2012-12-04 00:36:06 +0000 | [diff] [blame] | 64 | } |
| 65 | Builder.SetFastMathFlags(FMF); |
Chris Lattner | 5696e7b | 2008-06-17 18:05:57 +0000 | [diff] [blame] | 66 | } |
Chris Lattner | d1af2d2 | 2007-05-29 23:17:50 +0000 | [diff] [blame] | 67 | |
John McCall | 08ef466 | 2011-11-10 08:15:53 +0000 | [diff] [blame] | 68 | CodeGenFunction::~CodeGenFunction() { |
Richard Smith | 736a947 | 2013-06-12 20:42:33 +0000 | [diff] [blame] | 69 | assert(LifetimeExtendedCleanupStack.empty() && "failed to emit a cleanup"); |
| 70 | |
John McCall | 08ef466 | 2011-11-10 08:15:53 +0000 | [diff] [blame] | 71 | // If there are any unclaimed block infos, go ahead and destroy them |
| 72 | // now. This can happen if IR-gen gets clever and skips evaluating |
| 73 | // something. |
| 74 | if (FirstBlockInfo) |
| 75 | destroyBlockInfos(FirstBlockInfo); |
Alexey Bataev | 9959db5 | 2014-05-06 10:08:46 +0000 | [diff] [blame] | 76 | |
| 77 | if (getLangOpts().OpenMP) { |
| 78 | CGM.getOpenMPRuntime().FunctionFinished(*this); |
| 79 | } |
John McCall | 08ef466 | 2011-11-10 08:15:53 +0000 | [diff] [blame] | 80 | } |
| 81 | |
Chris Lattner | d1af2d2 | 2007-05-29 23:17:50 +0000 | [diff] [blame] | 82 | |
Chris Lattner | a5f58b0 | 2011-07-09 17:41:47 +0000 | [diff] [blame] | 83 | llvm::Type *CodeGenFunction::ConvertTypeForMem(QualType T) { |
Daniel Dunbar | ee3da87 | 2009-02-03 23:03:55 +0000 | [diff] [blame] | 84 | return CGM.getTypes().ConvertTypeForMem(T); |
| 85 | } |
| 86 | |
Chris Lattner | a5f58b0 | 2011-07-09 17:41:47 +0000 | [diff] [blame] | 87 | llvm::Type *CodeGenFunction::ConvertType(QualType T) { |
Chris Lattner | f033c14 | 2007-06-22 19:05:19 +0000 | [diff] [blame] | 88 | return CGM.getTypes().ConvertType(T); |
Chris Lattner | 45bb914 | 2007-06-09 02:28:57 +0000 | [diff] [blame] | 89 | } |
Chris Lattner | d1af2d2 | 2007-05-29 23:17:50 +0000 | [diff] [blame] | 90 | |
John McCall | 47fb950 | 2013-03-07 21:37:08 +0000 | [diff] [blame] | 91 | TypeEvaluationKind CodeGenFunction::getEvaluationKind(QualType type) { |
| 92 | type = type.getCanonicalType(); |
| 93 | while (true) { |
| 94 | switch (type->getTypeClass()) { |
John McCall | 745ae28 | 2011-05-15 02:34:36 +0000 | [diff] [blame] | 95 | #define TYPE(name, parent) |
| 96 | #define ABSTRACT_TYPE(name, parent) |
| 97 | #define NON_CANONICAL_TYPE(name, parent) case Type::name: |
| 98 | #define DEPENDENT_TYPE(name, parent) case Type::name: |
| 99 | #define NON_CANONICAL_UNLESS_DEPENDENT_TYPE(name, parent) case Type::name: |
| 100 | #include "clang/AST/TypeNodes.def" |
John McCall | 47fb950 | 2013-03-07 21:37:08 +0000 | [diff] [blame] | 101 | llvm_unreachable("non-canonical or dependent type in IR-generation"); |
John McCall | 745ae28 | 2011-05-15 02:34:36 +0000 | [diff] [blame] | 102 | |
Richard Smith | 27d807c | 2013-04-30 13:56:41 +0000 | [diff] [blame] | 103 | case Type::Auto: |
| 104 | llvm_unreachable("undeduced auto type in IR-generation"); |
| 105 | |
John McCall | 47fb950 | 2013-03-07 21:37:08 +0000 | [diff] [blame] | 106 | // Various scalar types. |
| 107 | case Type::Builtin: |
| 108 | case Type::Pointer: |
| 109 | case Type::BlockPointer: |
| 110 | case Type::LValueReference: |
| 111 | case Type::RValueReference: |
| 112 | case Type::MemberPointer: |
| 113 | case Type::Vector: |
| 114 | case Type::ExtVector: |
| 115 | case Type::FunctionProto: |
| 116 | case Type::FunctionNoProto: |
| 117 | case Type::Enum: |
| 118 | case Type::ObjCObjectPointer: |
| 119 | return TEK_Scalar; |
John McCall | 745ae28 | 2011-05-15 02:34:36 +0000 | [diff] [blame] | 120 | |
John McCall | 47fb950 | 2013-03-07 21:37:08 +0000 | [diff] [blame] | 121 | // Complexes. |
| 122 | case Type::Complex: |
| 123 | return TEK_Complex; |
Eli Friedman | 0dfb889 | 2011-10-06 23:00:33 +0000 | [diff] [blame] | 124 | |
John McCall | 47fb950 | 2013-03-07 21:37:08 +0000 | [diff] [blame] | 125 | // Arrays, records, and Objective-C objects. |
| 126 | case Type::ConstantArray: |
| 127 | case Type::IncompleteArray: |
| 128 | case Type::VariableArray: |
| 129 | case Type::Record: |
| 130 | case Type::ObjCObject: |
| 131 | case Type::ObjCInterface: |
| 132 | return TEK_Aggregate; |
| 133 | |
| 134 | // We operate on atomic values according to their underlying type. |
| 135 | case Type::Atomic: |
| 136 | type = cast<AtomicType>(type)->getValueType(); |
| 137 | continue; |
| 138 | } |
| 139 | llvm_unreachable("unknown type kind!"); |
John McCall | 745ae28 | 2011-05-15 02:34:36 +0000 | [diff] [blame] | 140 | } |
Chris Lattner | 54fb19e | 2007-06-22 22:02:34 +0000 | [diff] [blame] | 141 | } |
| 142 | |
David Blaikie | 357aafb | 2013-02-01 19:09:49 +0000 | [diff] [blame] | 143 | void CodeGenFunction::EmitReturnBlock() { |
Daniel Dunbar | fd346a3 | 2009-01-26 23:27:52 +0000 | [diff] [blame] | 144 | // For cleanliness, we try to avoid emitting the return block for |
| 145 | // simple cases. |
| 146 | llvm::BasicBlock *CurBB = Builder.GetInsertBlock(); |
| 147 | |
| 148 | if (CurBB) { |
| 149 | assert(!CurBB->getTerminator() && "Unexpected terminated block."); |
| 150 | |
Daniel Dunbar | ea3060a | 2009-07-19 08:24:34 +0000 | [diff] [blame] | 151 | // We have a valid insert point, reuse it if it is empty or there are no |
| 152 | // explicit jumps to the return block. |
John McCall | ad5d61e | 2010-07-23 21:56:41 +0000 | [diff] [blame] | 153 | if (CurBB->empty() || ReturnBlock.getBlock()->use_empty()) { |
| 154 | ReturnBlock.getBlock()->replaceAllUsesWith(CurBB); |
| 155 | delete ReturnBlock.getBlock(); |
Daniel Dunbar | ea3060a | 2009-07-19 08:24:34 +0000 | [diff] [blame] | 156 | } else |
John McCall | ad5d61e | 2010-07-23 21:56:41 +0000 | [diff] [blame] | 157 | EmitBlock(ReturnBlock.getBlock()); |
David Blaikie | 357aafb | 2013-02-01 19:09:49 +0000 | [diff] [blame] | 158 | return; |
Daniel Dunbar | fd346a3 | 2009-01-26 23:27:52 +0000 | [diff] [blame] | 159 | } |
| 160 | |
| 161 | // Otherwise, if the return block is the target of a single direct |
| 162 | // branch then we can just put the code in that block instead. This |
| 163 | // cleans up functions which started with a unified return block. |
John McCall | ad5d61e | 2010-07-23 21:56:41 +0000 | [diff] [blame] | 164 | if (ReturnBlock.getBlock()->hasOneUse()) { |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 165 | llvm::BranchInst *BI = |
Chandler Carruth | 4d01fff | 2014-03-09 03:16:50 +0000 | [diff] [blame] | 166 | dyn_cast<llvm::BranchInst>(*ReturnBlock.getBlock()->user_begin()); |
John McCall | bd30929 | 2010-07-06 01:34:17 +0000 | [diff] [blame] | 167 | if (BI && BI->isUnconditional() && |
John McCall | ad5d61e | 2010-07-23 21:56:41 +0000 | [diff] [blame] | 168 | BI->getSuccessor(0) == ReturnBlock.getBlock()) { |
David Blaikie | 1d969f4 | 2013-02-23 19:20:56 +0000 | [diff] [blame] | 169 | // Reset insertion point, including debug location, and delete the |
| 170 | // branch. This is really subtle and only works because the next change |
| 171 | // in location will hit the caching in CGDebugInfo::EmitLocation and not |
| 172 | // override this. |
Eric Christopher | 65c5c91 | 2011-09-09 21:53:04 +0000 | [diff] [blame] | 173 | Builder.SetCurrentDebugLocation(BI->getDebugLoc()); |
Daniel Dunbar | fd346a3 | 2009-01-26 23:27:52 +0000 | [diff] [blame] | 174 | Builder.SetInsertPoint(BI->getParent()); |
| 175 | BI->eraseFromParent(); |
John McCall | ad5d61e | 2010-07-23 21:56:41 +0000 | [diff] [blame] | 176 | delete ReturnBlock.getBlock(); |
David Blaikie | 357aafb | 2013-02-01 19:09:49 +0000 | [diff] [blame] | 177 | return; |
Daniel Dunbar | fd346a3 | 2009-01-26 23:27:52 +0000 | [diff] [blame] | 178 | } |
| 179 | } |
| 180 | |
Mike Stump | 18bb928 | 2009-05-16 07:57:57 +0000 | [diff] [blame] | 181 | // FIXME: We are at an unreachable point, there is no reason to emit the block |
| 182 | // unless it has uses. However, we still need a place to put the debug |
| 183 | // region.end for now. |
Daniel Dunbar | fd346a3 | 2009-01-26 23:27:52 +0000 | [diff] [blame] | 184 | |
John McCall | ad5d61e | 2010-07-23 21:56:41 +0000 | [diff] [blame] | 185 | EmitBlock(ReturnBlock.getBlock()); |
John McCall | bd30929 | 2010-07-06 01:34:17 +0000 | [diff] [blame] | 186 | } |
| 187 | |
| 188 | static void EmitIfUsed(CodeGenFunction &CGF, llvm::BasicBlock *BB) { |
| 189 | if (!BB) return; |
| 190 | if (!BB->use_empty()) |
| 191 | return CGF.CurFn->getBasicBlockList().push_back(BB); |
| 192 | delete BB; |
Daniel Dunbar | fd346a3 | 2009-01-26 23:27:52 +0000 | [diff] [blame] | 193 | } |
| 194 | |
Daniel Dunbar | 89654ee | 2008-08-26 08:29:31 +0000 | [diff] [blame] | 195 | void CodeGenFunction::FinishFunction(SourceLocation EndLoc) { |
Chris Lattner | e73e432 | 2007-07-16 21:28:45 +0000 | [diff] [blame] | 196 | assert(BreakContinueStack.empty() && |
| 197 | "mismatched push/pop in break/continue stack!"); |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 198 | |
Adrian Prantl | 52bf3c4 | 2013-05-03 20:11:48 +0000 | [diff] [blame] | 199 | bool OnlySimpleReturnStmts = NumSimpleReturnExprs > 0 |
Adrian Prantl | 524ba1f | 2013-07-25 00:23:42 +0000 | [diff] [blame] | 200 | && NumSimpleReturnExprs == NumReturnExprs |
| 201 | && ReturnBlock.getBlock()->use_empty(); |
| 202 | // Usually the return expression is evaluated before the cleanup |
| 203 | // code. If the function contains only a simple return statement, |
| 204 | // such as a constant, the location before the cleanup code becomes |
| 205 | // the last useful breakpoint in the function, because the simple |
| 206 | // return expression will be evaluated after the cleanup code. To be |
| 207 | // safe, set the debug location for cleanup code to the location of |
| 208 | // the return statement. Otherwise the cleanup code should be at the |
| 209 | // end of the function's lexical scope. |
| 210 | // |
| 211 | // If there are multiple branches to the return block, the branch |
| 212 | // instructions will get the location of the return statements and |
| 213 | // all will be fine. |
Adrian Prantl | 3be1054 | 2013-05-02 17:30:20 +0000 | [diff] [blame] | 214 | if (CGDebugInfo *DI = getDebugInfo()) { |
Adrian Prantl | 52bf3c4 | 2013-05-03 20:11:48 +0000 | [diff] [blame] | 215 | if (OnlySimpleReturnStmts) |
Adrian Prantl | e83b130 | 2014-01-07 22:05:52 +0000 | [diff] [blame] | 216 | DI->EmitLocation(Builder, LastStopPoint); |
Adrian Prantl | 3be1054 | 2013-05-02 17:30:20 +0000 | [diff] [blame] | 217 | else |
Adrian Prantl | e83b130 | 2014-01-07 22:05:52 +0000 | [diff] [blame] | 218 | DI->EmitLocation(Builder, EndLoc); |
Adrian Prantl | 3be1054 | 2013-05-02 17:30:20 +0000 | [diff] [blame] | 219 | } |
David Blaikie | 357aafb | 2013-02-01 19:09:49 +0000 | [diff] [blame] | 220 | |
John McCall | 31168b0 | 2011-06-15 23:02:42 +0000 | [diff] [blame] | 221 | // Pop any cleanups that might have been associated with the |
| 222 | // parameters. Do this in whatever block we're currently in; it's |
| 223 | // important to do this before we enter the return block or return |
| 224 | // edges will be *really* confused. |
Adrian Prantl | 3be1054 | 2013-05-02 17:30:20 +0000 | [diff] [blame] | 225 | bool EmitRetDbgLoc = true; |
| 226 | if (EHStack.stable_begin() != PrologueCleanupDepth) { |
Adrian Prantl | dc237b5 | 2013-05-16 00:41:26 +0000 | [diff] [blame] | 227 | PopCleanupBlocks(PrologueCleanupDepth); |
John McCall | 31168b0 | 2011-06-15 23:02:42 +0000 | [diff] [blame] | 228 | |
Adrian Prantl | 3be1054 | 2013-05-02 17:30:20 +0000 | [diff] [blame] | 229 | // Make sure the line table doesn't jump back into the body for |
| 230 | // the ret after it's been at EndLoc. |
| 231 | EmitRetDbgLoc = false; |
| 232 | |
| 233 | if (CGDebugInfo *DI = getDebugInfo()) |
Adrian Prantl | 52bf3c4 | 2013-05-03 20:11:48 +0000 | [diff] [blame] | 234 | if (OnlySimpleReturnStmts) |
Adrian Prantl | e83b130 | 2014-01-07 22:05:52 +0000 | [diff] [blame] | 235 | DI->EmitLocation(Builder, EndLoc); |
Adrian Prantl | 3be1054 | 2013-05-02 17:30:20 +0000 | [diff] [blame] | 236 | } |
| 237 | |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 238 | // Emit function epilog (to return). |
David Blaikie | 357aafb | 2013-02-01 19:09:49 +0000 | [diff] [blame] | 239 | EmitReturnBlock(); |
Daniel Dunbar | fab3f93 | 2008-11-11 20:59:54 +0000 | [diff] [blame] | 240 | |
Daniel Dunbar | 468a8f8 | 2011-02-10 17:32:22 +0000 | [diff] [blame] | 241 | if (ShouldInstrumentFunction()) |
| 242 | EmitFunctionInstrumentation("__cyg_profile_func_exit"); |
Chris Lattner | 3c77a35 | 2010-06-22 00:03:40 +0000 | [diff] [blame] | 243 | |
Daniel Dunbar | fab3f93 | 2008-11-11 20:59:54 +0000 | [diff] [blame] | 244 | // Emit debug descriptor for function end. |
Anders Carlsson | 63784f4 | 2009-02-13 08:11:52 +0000 | [diff] [blame] | 245 | if (CGDebugInfo *DI = getDebugInfo()) { |
Devang Patel | 0884a60 | 2010-07-22 22:29:16 +0000 | [diff] [blame] | 246 | DI->EmitFunctionEnd(Builder); |
Daniel Dunbar | fab3f93 | 2008-11-11 20:59:54 +0000 | [diff] [blame] | 247 | } |
| 248 | |
Nick Lewycky | 2d84e84 | 2013-10-02 02:29:49 +0000 | [diff] [blame] | 249 | EmitFunctionEpilog(*CurFnInfo, EmitRetDbgLoc, EndLoc); |
Mike Stump | 1d84921 | 2009-12-07 23:38:24 +0000 | [diff] [blame] | 250 | EmitEndEHSpec(CurCodeDecl); |
Daniel Dunbar | 54bb193 | 2008-09-09 21:00:17 +0000 | [diff] [blame] | 251 | |
John McCall | bd30929 | 2010-07-06 01:34:17 +0000 | [diff] [blame] | 252 | assert(EHStack.empty() && |
| 253 | "did not remove all scopes from cleanup stack!"); |
| 254 | |
Chris Lattner | 6c4d255 | 2009-10-28 23:59:40 +0000 | [diff] [blame] | 255 | // If someone did an indirect goto, emit the indirect goto block at the end of |
| 256 | // the function. |
| 257 | if (IndirectBranch) { |
| 258 | EmitBlock(IndirectBranch->getParent()); |
| 259 | Builder.ClearInsertionPoint(); |
| 260 | } |
Michael Ilseman | 686240a | 2012-12-04 00:29:55 +0000 | [diff] [blame] | 261 | |
Chris Lattner | c48023b | 2007-12-02 06:32:24 +0000 | [diff] [blame] | 262 | // Remove the AllocaInsertPt instruction, which is just a convenience for us. |
Chris Lattner | 2739d2b | 2009-03-31 22:17:44 +0000 | [diff] [blame] | 263 | llvm::Instruction *Ptr = AllocaInsertPt; |
Chris Lattner | c48023b | 2007-12-02 06:32:24 +0000 | [diff] [blame] | 264 | AllocaInsertPt = 0; |
Chris Lattner | 2739d2b | 2009-03-31 22:17:44 +0000 | [diff] [blame] | 265 | Ptr->eraseFromParent(); |
Michael Ilseman | 686240a | 2012-12-04 00:29:55 +0000 | [diff] [blame] | 266 | |
Chris Lattner | 6c4d255 | 2009-10-28 23:59:40 +0000 | [diff] [blame] | 267 | // If someone took the address of a label but never did an indirect goto, we |
| 268 | // made a zero entry PHI node, which is illegal, zap it now. |
| 269 | if (IndirectBranch) { |
| 270 | llvm::PHINode *PN = cast<llvm::PHINode>(IndirectBranch->getAddress()); |
| 271 | if (PN->getNumIncomingValues() == 0) { |
| 272 | PN->replaceAllUsesWith(llvm::UndefValue::get(PN->getType())); |
| 273 | PN->eraseFromParent(); |
| 274 | } |
| 275 | } |
John McCall | bd30929 | 2010-07-06 01:34:17 +0000 | [diff] [blame] | 276 | |
John McCall | 8e4c74b | 2011-08-11 02:22:43 +0000 | [diff] [blame] | 277 | EmitIfUsed(*this, EHResumeBlock); |
John McCall | bd30929 | 2010-07-06 01:34:17 +0000 | [diff] [blame] | 278 | EmitIfUsed(*this, TerminateLandingPad); |
| 279 | EmitIfUsed(*this, TerminateHandler); |
| 280 | EmitIfUsed(*this, UnreachableBlock); |
John McCall | 09ae032 | 2010-07-06 23:57:41 +0000 | [diff] [blame] | 281 | |
| 282 | if (CGM.getCodeGenOpts().EmitDeclMetadata) |
| 283 | EmitDeclMetadata(); |
Reid Kleckner | 314ef7b | 2014-02-01 00:04:45 +0000 | [diff] [blame] | 284 | |
| 285 | for (SmallVectorImpl<std::pair<llvm::Instruction *, llvm::Value *> >::iterator |
| 286 | I = DeferredReplacements.begin(), |
| 287 | E = DeferredReplacements.end(); |
| 288 | I != E; ++I) { |
| 289 | I->first->replaceAllUsesWith(I->second); |
| 290 | I->first->eraseFromParent(); |
| 291 | } |
Chris Lattner | d1af2d2 | 2007-05-29 23:17:50 +0000 | [diff] [blame] | 292 | } |
Chris Lattner | 308f431 | 2007-05-29 23:50:05 +0000 | [diff] [blame] | 293 | |
Chris Lattner | 3c77a35 | 2010-06-22 00:03:40 +0000 | [diff] [blame] | 294 | /// ShouldInstrumentFunction - Return true if the current function should be |
| 295 | /// instrumented with __cyg_profile_func_* calls |
| 296 | bool CodeGenFunction::ShouldInstrumentFunction() { |
| 297 | if (!CGM.getCodeGenOpts().InstrumentFunctions) |
| 298 | return false; |
Ted Kremenek | c249c41 | 2011-05-16 23:49:20 +0000 | [diff] [blame] | 299 | if (!CurFuncDecl || CurFuncDecl->hasAttr<NoInstrumentFunctionAttr>()) |
Chris Lattner | 3c77a35 | 2010-06-22 00:03:40 +0000 | [diff] [blame] | 300 | return false; |
| 301 | return true; |
| 302 | } |
| 303 | |
| 304 | /// EmitFunctionInstrumentation - Emit LLVM code to call the specified |
| 305 | /// instrumentation function with the current function and the call site, if |
| 306 | /// function instrumentation is enabled. |
| 307 | void CodeGenFunction::EmitFunctionInstrumentation(const char *Fn) { |
Chris Lattner | b48a2d5 | 2010-06-23 05:21:28 +0000 | [diff] [blame] | 308 | // void __cyg_profile_func_{enter,exit} (void *this_fn, void *call_site); |
Chris Lattner | a5f58b0 | 2011-07-09 17:41:47 +0000 | [diff] [blame] | 309 | llvm::PointerType *PointerTy = Int8PtrTy; |
| 310 | llvm::Type *ProfileFuncArgs[] = { PointerTy, PointerTy }; |
Chris Lattner | 2192fe5 | 2011-07-18 04:24:23 +0000 | [diff] [blame] | 311 | llvm::FunctionType *FunctionTy = |
Chris Lattner | ece0409 | 2012-02-07 00:39:47 +0000 | [diff] [blame] | 312 | llvm::FunctionType::get(VoidTy, ProfileFuncArgs, false); |
Chris Lattner | 3c77a35 | 2010-06-22 00:03:40 +0000 | [diff] [blame] | 313 | |
| 314 | llvm::Constant *F = CGM.CreateRuntimeFunction(FunctionTy, Fn); |
| 315 | llvm::CallInst *CallSite = Builder.CreateCall( |
Benjamin Kramer | 8d375ce | 2011-07-14 17:45:50 +0000 | [diff] [blame] | 316 | CGM.getIntrinsic(llvm::Intrinsic::returnaddress), |
Chris Lattner | 5e016ae | 2010-06-27 07:15:29 +0000 | [diff] [blame] | 317 | llvm::ConstantInt::get(Int32Ty, 0), |
Chris Lattner | 3c77a35 | 2010-06-22 00:03:40 +0000 | [diff] [blame] | 318 | "callsite"); |
| 319 | |
John McCall | 882987f | 2013-02-28 19:01:20 +0000 | [diff] [blame] | 320 | llvm::Value *args[] = { |
| 321 | llvm::ConstantExpr::getBitCast(CurFn, PointerTy), |
| 322 | CallSite |
| 323 | }; |
| 324 | |
| 325 | EmitNounwindRuntimeCall(F, args); |
Chris Lattner | 3c77a35 | 2010-06-22 00:03:40 +0000 | [diff] [blame] | 326 | } |
| 327 | |
Roman Divacky | 178e0160 | 2011-02-10 16:52:03 +0000 | [diff] [blame] | 328 | void CodeGenFunction::EmitMCountInstrumentation() { |
Chris Lattner | ece0409 | 2012-02-07 00:39:47 +0000 | [diff] [blame] | 329 | llvm::FunctionType *FTy = llvm::FunctionType::get(VoidTy, false); |
Roman Divacky | 178e0160 | 2011-02-10 16:52:03 +0000 | [diff] [blame] | 330 | |
John McCall | c8e0170 | 2013-04-16 22:48:15 +0000 | [diff] [blame] | 331 | llvm::Constant *MCountFn = |
| 332 | CGM.CreateRuntimeFunction(FTy, getTarget().getMCountName()); |
John McCall | 882987f | 2013-02-28 19:01:20 +0000 | [diff] [blame] | 333 | EmitNounwindRuntimeCall(MCountFn); |
Roman Divacky | 178e0160 | 2011-02-10 16:52:03 +0000 | [diff] [blame] | 334 | } |
| 335 | |
Tanya Lattner | 7445ada | 2012-07-11 23:02:10 +0000 | [diff] [blame] | 336 | // OpenCL v1.2 s5.6.4.6 allows the compiler to store kernel argument |
| 337 | // information in the program executable. The argument information stored |
| 338 | // includes the argument name, its type, the address and access qualifiers used. |
Tanya Lattner | 7445ada | 2012-07-11 23:02:10 +0000 | [diff] [blame] | 339 | static void GenOpenCLArgMetadata(const FunctionDecl *FD, llvm::Function *Fn, |
| 340 | CodeGenModule &CGM,llvm::LLVMContext &Context, |
Guy Benyei | fb36ede | 2013-03-24 13:58:12 +0000 | [diff] [blame] | 341 | SmallVector <llvm::Value*, 5> &kernelMDArgs, |
| 342 | CGBuilderTy& Builder, ASTContext &ASTCtx) { |
| 343 | // Create MDNodes that represent the kernel arg metadata. |
Tanya Lattner | 7445ada | 2012-07-11 23:02:10 +0000 | [diff] [blame] | 344 | // Each MDNode is a list in the form of "key", N number of values which is |
| 345 | // the same number of values as their are kernel arguments. |
Michael Ilseman | 686240a | 2012-12-04 00:29:55 +0000 | [diff] [blame] | 346 | |
Joey Gouly | 92a4744 | 2014-04-04 13:43:57 +0000 | [diff] [blame] | 347 | const PrintingPolicy &Policy = ASTCtx.getPrintingPolicy(); |
| 348 | |
Guy Benyei | fb36ede | 2013-03-24 13:58:12 +0000 | [diff] [blame] | 349 | // MDNode for the kernel argument address space qualifiers. |
| 350 | SmallVector<llvm::Value*, 8> addressQuals; |
| 351 | addressQuals.push_back(llvm::MDString::get(Context, "kernel_arg_addr_space")); |
| 352 | |
| 353 | // MDNode for the kernel argument access qualifiers (images only). |
| 354 | SmallVector<llvm::Value*, 8> accessQuals; |
| 355 | accessQuals.push_back(llvm::MDString::get(Context, "kernel_arg_access_qual")); |
| 356 | |
| 357 | // MDNode for the kernel argument type names. |
| 358 | SmallVector<llvm::Value*, 8> argTypeNames; |
| 359 | argTypeNames.push_back(llvm::MDString::get(Context, "kernel_arg_type")); |
| 360 | |
| 361 | // MDNode for the kernel argument type qualifiers. |
| 362 | SmallVector<llvm::Value*, 8> argTypeQuals; |
| 363 | argTypeQuals.push_back(llvm::MDString::get(Context, "kernel_arg_type_qual")); |
| 364 | |
Tanya Lattner | 7445ada | 2012-07-11 23:02:10 +0000 | [diff] [blame] | 365 | // MDNode for the kernel argument names. |
| 366 | SmallVector<llvm::Value*, 8> argNames; |
| 367 | argNames.push_back(llvm::MDString::get(Context, "kernel_arg_name")); |
Michael Ilseman | 686240a | 2012-12-04 00:29:55 +0000 | [diff] [blame] | 368 | |
Tanya Lattner | 7445ada | 2012-07-11 23:02:10 +0000 | [diff] [blame] | 369 | for (unsigned i = 0, e = FD->getNumParams(); i != e; ++i) { |
| 370 | const ParmVarDecl *parm = FD->getParamDecl(i); |
Guy Benyei | fb36ede | 2013-03-24 13:58:12 +0000 | [diff] [blame] | 371 | QualType ty = parm->getType(); |
| 372 | std::string typeQuals; |
| 373 | |
| 374 | if (ty->isPointerType()) { |
| 375 | QualType pointeeTy = ty->getPointeeType(); |
| 376 | |
| 377 | // Get address qualifier. |
| 378 | addressQuals.push_back(Builder.getInt32(ASTCtx.getTargetAddressSpace( |
| 379 | pointeeTy.getAddressSpace()))); |
| 380 | |
| 381 | // Get argument type name. |
Joey Gouly | 92a4744 | 2014-04-04 13:43:57 +0000 | [diff] [blame] | 382 | std::string typeName = |
| 383 | pointeeTy.getUnqualifiedType().getAsString(Policy) + "*"; |
Guy Benyei | fb36ede | 2013-03-24 13:58:12 +0000 | [diff] [blame] | 384 | |
| 385 | // Turn "unsigned type" to "utype" |
| 386 | std::string::size_type pos = typeName.find("unsigned"); |
Benjamin Kramer | ef89ae0 | 2013-03-24 16:04:55 +0000 | [diff] [blame] | 387 | if (pos != std::string::npos) |
| 388 | typeName.erase(pos+1, 8); |
Guy Benyei | fb36ede | 2013-03-24 13:58:12 +0000 | [diff] [blame] | 389 | |
| 390 | argTypeNames.push_back(llvm::MDString::get(Context, typeName)); |
| 391 | |
| 392 | // Get argument type qualifiers: |
| 393 | if (ty.isRestrictQualified()) |
| 394 | typeQuals = "restrict"; |
| 395 | if (pointeeTy.isConstQualified() || |
| 396 | (pointeeTy.getAddressSpace() == LangAS::opencl_constant)) |
Benjamin Kramer | ef89ae0 | 2013-03-24 16:04:55 +0000 | [diff] [blame] | 397 | typeQuals += typeQuals.empty() ? "const" : " const"; |
Guy Benyei | fb36ede | 2013-03-24 13:58:12 +0000 | [diff] [blame] | 398 | if (pointeeTy.isVolatileQualified()) |
Benjamin Kramer | ef89ae0 | 2013-03-24 16:04:55 +0000 | [diff] [blame] | 399 | typeQuals += typeQuals.empty() ? "volatile" : " volatile"; |
Guy Benyei | fb36ede | 2013-03-24 13:58:12 +0000 | [diff] [blame] | 400 | } else { |
Pekka Jaaskelainen | 3587b32 | 2014-01-09 13:37:30 +0000 | [diff] [blame] | 401 | uint32_t AddrSpc = 0; |
| 402 | if (ty->isImageType()) |
| 403 | AddrSpc = |
| 404 | CGM.getContext().getTargetAddressSpace(LangAS::opencl_global); |
Bob Wilson | 95a27b0 | 2014-02-17 19:20:59 +0000 | [diff] [blame] | 405 | |
Pekka Jaaskelainen | 3587b32 | 2014-01-09 13:37:30 +0000 | [diff] [blame] | 406 | addressQuals.push_back(Builder.getInt32(AddrSpc)); |
Guy Benyei | fb36ede | 2013-03-24 13:58:12 +0000 | [diff] [blame] | 407 | |
| 408 | // Get argument type name. |
Joey Gouly | 92a4744 | 2014-04-04 13:43:57 +0000 | [diff] [blame] | 409 | std::string typeName = ty.getUnqualifiedType().getAsString(Policy); |
Guy Benyei | fb36ede | 2013-03-24 13:58:12 +0000 | [diff] [blame] | 410 | |
| 411 | // Turn "unsigned type" to "utype" |
| 412 | std::string::size_type pos = typeName.find("unsigned"); |
Benjamin Kramer | ef89ae0 | 2013-03-24 16:04:55 +0000 | [diff] [blame] | 413 | if (pos != std::string::npos) |
| 414 | typeName.erase(pos+1, 8); |
Guy Benyei | fb36ede | 2013-03-24 13:58:12 +0000 | [diff] [blame] | 415 | |
| 416 | argTypeNames.push_back(llvm::MDString::get(Context, typeName)); |
| 417 | |
| 418 | // Get argument type qualifiers: |
| 419 | if (ty.isConstQualified()) |
| 420 | typeQuals = "const"; |
| 421 | if (ty.isVolatileQualified()) |
Benjamin Kramer | ef89ae0 | 2013-03-24 16:04:55 +0000 | [diff] [blame] | 422 | typeQuals += typeQuals.empty() ? "volatile" : " volatile"; |
Guy Benyei | fb36ede | 2013-03-24 13:58:12 +0000 | [diff] [blame] | 423 | } |
Justin Bogner | 0f06606 | 2013-11-22 10:20:40 +0000 | [diff] [blame] | 424 | |
Guy Benyei | fb36ede | 2013-03-24 13:58:12 +0000 | [diff] [blame] | 425 | argTypeQuals.push_back(llvm::MDString::get(Context, typeQuals)); |
| 426 | |
| 427 | // Get image access qualifier: |
| 428 | if (ty->isImageType()) { |
Aaron Ballman | c432799 | 2013-12-19 03:09:10 +0000 | [diff] [blame] | 429 | const OpenCLImageAccessAttr *A = parm->getAttr<OpenCLImageAccessAttr>(); |
Aaron Ballman | 2689133 | 2014-01-14 17:41:53 +0000 | [diff] [blame] | 430 | if (A && A->isWriteOnly()) |
Guy Benyei | fb36ede | 2013-03-24 13:58:12 +0000 | [diff] [blame] | 431 | accessQuals.push_back(llvm::MDString::get(Context, "write_only")); |
| 432 | else |
| 433 | accessQuals.push_back(llvm::MDString::get(Context, "read_only")); |
Aaron Ballman | 2689133 | 2014-01-14 17:41:53 +0000 | [diff] [blame] | 434 | // FIXME: what about read_write? |
Guy Benyei | fb36ede | 2013-03-24 13:58:12 +0000 | [diff] [blame] | 435 | } else |
| 436 | accessQuals.push_back(llvm::MDString::get(Context, "none")); |
Michael Ilseman | 686240a | 2012-12-04 00:29:55 +0000 | [diff] [blame] | 437 | |
Tanya Lattner | 7445ada | 2012-07-11 23:02:10 +0000 | [diff] [blame] | 438 | // Get argument name. |
| 439 | argNames.push_back(llvm::MDString::get(Context, parm->getName())); |
Tanya Lattner | 7445ada | 2012-07-11 23:02:10 +0000 | [diff] [blame] | 440 | } |
Guy Benyei | fb36ede | 2013-03-24 13:58:12 +0000 | [diff] [blame] | 441 | |
| 442 | kernelMDArgs.push_back(llvm::MDNode::get(Context, addressQuals)); |
| 443 | kernelMDArgs.push_back(llvm::MDNode::get(Context, accessQuals)); |
| 444 | kernelMDArgs.push_back(llvm::MDNode::get(Context, argTypeNames)); |
| 445 | kernelMDArgs.push_back(llvm::MDNode::get(Context, argTypeQuals)); |
Tanya Lattner | 7445ada | 2012-07-11 23:02:10 +0000 | [diff] [blame] | 446 | kernelMDArgs.push_back(llvm::MDNode::get(Context, argNames)); |
| 447 | } |
| 448 | |
Michael Ilseman | 686240a | 2012-12-04 00:29:55 +0000 | [diff] [blame] | 449 | void CodeGenFunction::EmitOpenCLKernelMetadata(const FunctionDecl *FD, |
Tanya Lattner | bcffcdf | 2012-07-09 22:06:01 +0000 | [diff] [blame] | 450 | llvm::Function *Fn) |
| 451 | { |
| 452 | if (!FD->hasAttr<OpenCLKernelAttr>()) |
| 453 | return; |
| 454 | |
| 455 | llvm::LLVMContext &Context = getLLVMContext(); |
| 456 | |
Dmitri Gribenko | f857950 | 2013-01-12 19:30:44 +0000 | [diff] [blame] | 457 | SmallVector <llvm::Value*, 5> kernelMDArgs; |
Tanya Lattner | bcffcdf | 2012-07-09 22:06:01 +0000 | [diff] [blame] | 458 | kernelMDArgs.push_back(Fn); |
| 459 | |
Tanya Lattner | 7445ada | 2012-07-11 23:02:10 +0000 | [diff] [blame] | 460 | if (CGM.getCodeGenOpts().EmitOpenCLArgMetadata) |
Guy Benyei | fb36ede | 2013-03-24 13:58:12 +0000 | [diff] [blame] | 461 | GenOpenCLArgMetadata(FD, Fn, CGM, Context, kernelMDArgs, |
| 462 | Builder, getContext()); |
Michael Ilseman | 686240a | 2012-12-04 00:29:55 +0000 | [diff] [blame] | 463 | |
Aaron Ballman | c432799 | 2013-12-19 03:09:10 +0000 | [diff] [blame] | 464 | if (const VecTypeHintAttr *A = FD->getAttr<VecTypeHintAttr>()) { |
| 465 | QualType hintQTy = A->getTypeHint(); |
Joey Gouly | aba589c | 2013-03-08 09:42:32 +0000 | [diff] [blame] | 466 | const ExtVectorType *hintEltQTy = hintQTy->getAs<ExtVectorType>(); |
| 467 | bool isSignedInteger = |
| 468 | hintQTy->isSignedIntegerType() || |
| 469 | (hintEltQTy && hintEltQTy->getElementType()->isSignedIntegerType()); |
| 470 | llvm::Value *attrMDArgs[] = { |
| 471 | llvm::MDString::get(Context, "vec_type_hint"), |
Aaron Ballman | c432799 | 2013-12-19 03:09:10 +0000 | [diff] [blame] | 472 | llvm::UndefValue::get(CGM.getTypes().ConvertType(A->getTypeHint())), |
Joey Gouly | aba589c | 2013-03-08 09:42:32 +0000 | [diff] [blame] | 473 | llvm::ConstantInt::get( |
| 474 | llvm::IntegerType::get(Context, 32), |
| 475 | llvm::APInt(32, (uint64_t)(isSignedInteger ? 1 : 0))) |
| 476 | }; |
| 477 | kernelMDArgs.push_back(llvm::MDNode::get(Context, attrMDArgs)); |
| 478 | } |
| 479 | |
Aaron Ballman | c432799 | 2013-12-19 03:09:10 +0000 | [diff] [blame] | 480 | if (const WorkGroupSizeHintAttr *A = FD->getAttr<WorkGroupSizeHintAttr>()) { |
Benjamin Kramer | c1b7841 | 2012-11-15 16:40:35 +0000 | [diff] [blame] | 481 | llvm::Value *attrMDArgs[] = { |
| 482 | llvm::MDString::get(Context, "work_group_size_hint"), |
Aaron Ballman | c432799 | 2013-12-19 03:09:10 +0000 | [diff] [blame] | 483 | Builder.getInt32(A->getXDim()), |
| 484 | Builder.getInt32(A->getYDim()), |
| 485 | Builder.getInt32(A->getZDim()) |
Benjamin Kramer | c1b7841 | 2012-11-15 16:40:35 +0000 | [diff] [blame] | 486 | }; |
Tanya Lattner | bcffcdf | 2012-07-09 22:06:01 +0000 | [diff] [blame] | 487 | kernelMDArgs.push_back(llvm::MDNode::get(Context, attrMDArgs)); |
| 488 | } |
| 489 | |
Aaron Ballman | c432799 | 2013-12-19 03:09:10 +0000 | [diff] [blame] | 490 | if (const ReqdWorkGroupSizeAttr *A = FD->getAttr<ReqdWorkGroupSizeAttr>()) { |
Benjamin Kramer | c1b7841 | 2012-11-15 16:40:35 +0000 | [diff] [blame] | 491 | llvm::Value *attrMDArgs[] = { |
| 492 | llvm::MDString::get(Context, "reqd_work_group_size"), |
Aaron Ballman | c432799 | 2013-12-19 03:09:10 +0000 | [diff] [blame] | 493 | Builder.getInt32(A->getXDim()), |
| 494 | Builder.getInt32(A->getYDim()), |
| 495 | Builder.getInt32(A->getZDim()) |
Benjamin Kramer | c1b7841 | 2012-11-15 16:40:35 +0000 | [diff] [blame] | 496 | }; |
Tanya Lattner | bcffcdf | 2012-07-09 22:06:01 +0000 | [diff] [blame] | 497 | kernelMDArgs.push_back(llvm::MDNode::get(Context, attrMDArgs)); |
| 498 | } |
| 499 | |
| 500 | llvm::MDNode *kernelMDNode = llvm::MDNode::get(Context, kernelMDArgs); |
| 501 | llvm::NamedMDNode *OpenCLKernelMetadata = |
| 502 | CGM.getModule().getOrInsertNamedMetadata("opencl.kernels"); |
| 503 | OpenCLKernelMetadata->addOperand(kernelMDNode); |
| 504 | } |
| 505 | |
Adrian Prantl | 2cede0f | 2014-04-29 01:07:59 +0000 | [diff] [blame] | 506 | /// Determine whether the function F ends with a return stmt. |
| 507 | static bool endsWithReturn(const Decl* F) { |
| 508 | const Stmt *Body = nullptr; |
| 509 | if (auto *FD = dyn_cast_or_null<FunctionDecl>(F)) |
| 510 | Body = FD->getBody(); |
| 511 | else if (auto *OMD = dyn_cast_or_null<ObjCMethodDecl>(F)) |
| 512 | Body = OMD->getBody(); |
| 513 | |
| 514 | if (auto *CS = dyn_cast_or_null<CompoundStmt>(Body)) { |
| 515 | auto LastStmt = CS->body_rbegin(); |
| 516 | if (LastStmt != CS->body_rend()) |
| 517 | return isa<ReturnStmt>(*LastStmt); |
| 518 | } |
| 519 | return false; |
| 520 | } |
| 521 | |
John McCall | dec348f7 | 2013-05-03 07:33:41 +0000 | [diff] [blame] | 522 | void CodeGenFunction::StartFunction(GlobalDecl GD, |
| 523 | QualType RetTy, |
Daniel Dunbar | bc915f4 | 2008-09-09 23:14:03 +0000 | [diff] [blame] | 524 | llvm::Function *Fn, |
John McCall | a738c25 | 2011-03-09 04:27:21 +0000 | [diff] [blame] | 525 | const CGFunctionInfo &FnInfo, |
Daniel Dunbar | 354d278 | 2008-10-18 18:22:23 +0000 | [diff] [blame] | 526 | const FunctionArgList &Args, |
Adrian Prantl | 42d71b9 | 2014-04-10 23:21:53 +0000 | [diff] [blame] | 527 | SourceLocation Loc, |
Tilmann Scheller | 99cc30c | 2011-03-02 21:36:49 +0000 | [diff] [blame] | 528 | SourceLocation StartLoc) { |
Anders Carlsson | 73fcc95 | 2009-09-11 00:07:24 +0000 | [diff] [blame] | 529 | const Decl *D = GD.getDecl(); |
Michael Ilseman | 686240a | 2012-12-04 00:29:55 +0000 | [diff] [blame] | 530 | |
Anders Carlsson | f4478e9 | 2009-02-09 20:20:56 +0000 | [diff] [blame] | 531 | DidCallStackSave = false; |
John McCall | dec348f7 | 2013-05-03 07:33:41 +0000 | [diff] [blame] | 532 | CurCodeDecl = D; |
| 533 | CurFuncDecl = (D ? D->getNonClosureContext() : 0); |
Daniel Dunbar | bc915f4 | 2008-09-09 23:14:03 +0000 | [diff] [blame] | 534 | FnRetTy = RetTy; |
Daniel Dunbar | 9c42652 | 2008-07-29 23:18:29 +0000 | [diff] [blame] | 535 | CurFn = Fn; |
John McCall | a738c25 | 2011-03-09 04:27:21 +0000 | [diff] [blame] | 536 | CurFnInfo = &FnInfo; |
Chris Lattner | 5696e7b | 2008-06-17 18:05:57 +0000 | [diff] [blame] | 537 | assert(CurFn->isDeclaration() && "Function already has body?"); |
| 538 | |
Will Dietz | f54319c | 2013-01-18 11:30:38 +0000 | [diff] [blame] | 539 | if (CGM.getSanitizerBlacklist().isIn(*Fn)) { |
| 540 | SanOpts = &SanitizerOptions::Disabled; |
| 541 | SanitizePerformTypeCheck = false; |
| 542 | } |
| 543 | |
Jakob Stoklund Olesen | 819e54b | 2010-02-09 00:10:00 +0000 | [diff] [blame] | 544 | // Pass inline keyword to optimizer if it appears explicitly on any |
Roman Divacky | dd9bfb2 | 2014-01-15 19:07:16 +0000 | [diff] [blame] | 545 | // declaration. Also, in the case of -fno-inline attach NoInline |
David Majnemer | 19d7d54 | 2014-02-25 10:51:14 +0000 | [diff] [blame] | 546 | // attribute to all function that are not marked AlwaysInline. |
Roman Divacky | dd9bfb2 | 2014-01-15 19:07:16 +0000 | [diff] [blame] | 547 | if (const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(D)) { |
| 548 | if (!CGM.getCodeGenOpts().NoInline) { |
Aaron Ballman | 86c9390 | 2014-03-06 23:45:36 +0000 | [diff] [blame] | 549 | for (auto RI : FD->redecls()) |
Chad Rosier | 883b257 | 2012-03-14 23:32:11 +0000 | [diff] [blame] | 550 | if (RI->isInlineSpecified()) { |
Bill Wendling | 207f053 | 2012-12-20 19:27:06 +0000 | [diff] [blame] | 551 | Fn->addFnAttr(llvm::Attribute::InlineHint); |
Chad Rosier | 883b257 | 2012-03-14 23:32:11 +0000 | [diff] [blame] | 552 | break; |
| 553 | } |
David Majnemer | 67e541e1c | 2014-02-25 09:53:29 +0000 | [diff] [blame] | 554 | } else if (!FD->hasAttr<AlwaysInlineAttr>()) |
Roman Divacky | dd9bfb2 | 2014-01-15 19:07:16 +0000 | [diff] [blame] | 555 | Fn->addFnAttr(llvm::Attribute::NoInline); |
| 556 | } |
Jakob Stoklund Olesen | 819e54b | 2010-02-09 00:10:00 +0000 | [diff] [blame] | 557 | |
Richard Smith | 9c6890a | 2012-11-01 22:30:59 +0000 | [diff] [blame] | 558 | if (getLangOpts().OpenCL) { |
Peter Collingbourne | 7ce13fc | 2011-02-14 01:42:53 +0000 | [diff] [blame] | 559 | // Add metadata for a kernel function. |
| 560 | if (const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(D)) |
Tanya Lattner | bcffcdf | 2012-07-09 22:06:01 +0000 | [diff] [blame] | 561 | EmitOpenCLKernelMetadata(FD, Fn); |
Peter Collingbourne | 7ce13fc | 2011-02-14 01:42:53 +0000 | [diff] [blame] | 562 | } |
| 563 | |
Peter Collingbourne | b453cd6 | 2013-10-20 21:29:19 +0000 | [diff] [blame] | 564 | // If we are checking function types, emit a function type signature as |
| 565 | // prefix data. |
| 566 | if (getLangOpts().CPlusPlus && SanOpts->Function) { |
| 567 | if (const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(D)) { |
| 568 | if (llvm::Constant *PrefixSig = |
| 569 | CGM.getTargetCodeGenInfo().getUBSanFunctionSignature(CGM)) { |
| 570 | llvm::Constant *FTRTTIConst = |
| 571 | CGM.GetAddrOfRTTIDescriptor(FD->getType(), /*ForEH=*/true); |
| 572 | llvm::Constant *PrefixStructElems[] = { PrefixSig, FTRTTIConst }; |
| 573 | llvm::Constant *PrefixStructConst = |
| 574 | llvm::ConstantStruct::getAnon(PrefixStructElems, /*Packed=*/true); |
| 575 | Fn->setPrefixData(PrefixStructConst); |
| 576 | } |
| 577 | } |
| 578 | } |
| 579 | |
Daniel Dunbar | 75283ff | 2008-11-11 02:29:29 +0000 | [diff] [blame] | 580 | llvm::BasicBlock *EntryBB = createBasicBlock("entry", CurFn); |
Daniel Dunbar | 54bb193 | 2008-09-09 21:00:17 +0000 | [diff] [blame] | 581 | |
Chris Lattner | 5696e7b | 2008-06-17 18:05:57 +0000 | [diff] [blame] | 582 | // Create a marker to make it easy to insert allocas into the entryblock |
| 583 | // later. Don't create this with the builder, because we don't want it |
| 584 | // folded. |
Chris Lattner | 5e016ae | 2010-06-27 07:15:29 +0000 | [diff] [blame] | 585 | llvm::Value *Undef = llvm::UndefValue::get(Int32Ty); |
| 586 | AllocaInsertPt = new llvm::BitCastInst(Undef, Int32Ty, "", EntryBB); |
Chris Lattner | 4764022 | 2009-03-22 00:24:14 +0000 | [diff] [blame] | 587 | if (Builder.isNamePreserving()) |
| 588 | AllocaInsertPt->setName("allocapt"); |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 589 | |
John McCall | bd30929 | 2010-07-06 01:34:17 +0000 | [diff] [blame] | 590 | ReturnBlock = getJumpDestInCurrentScope("return"); |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 591 | |
Chris Lattner | 5696e7b | 2008-06-17 18:05:57 +0000 | [diff] [blame] | 592 | Builder.SetInsertPoint(EntryBB); |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 593 | |
Sanjiv Gupta | 1e8b608 | 2008-07-04 11:04:26 +0000 | [diff] [blame] | 594 | // Emit subprogram debug descriptor. |
Anders Carlsson | 63784f4 | 2009-02-13 08:11:52 +0000 | [diff] [blame] | 595 | if (CGDebugInfo *DI = getDebugInfo()) { |
Jordan Rose | 5c38272 | 2013-03-08 21:51:21 +0000 | [diff] [blame] | 596 | SmallVector<QualType, 16> ArgTypes; |
Eric Christopher | 4b4beb2 | 2011-10-21 23:30:10 +0000 | [diff] [blame] | 597 | for (FunctionArgList::const_iterator i = Args.begin(), e = Args.end(); |
| 598 | i != e; ++i) { |
Jordan Rose | 5c38272 | 2013-03-08 21:51:21 +0000 | [diff] [blame] | 599 | ArgTypes.push_back((*i)->getType()); |
Eric Christopher | 4b4beb2 | 2011-10-21 23:30:10 +0000 | [diff] [blame] | 600 | } |
| 601 | |
John McCall | db40c7f | 2010-12-14 08:05:40 +0000 | [diff] [blame] | 602 | QualType FnType = |
Jordan Rose | 5c38272 | 2013-03-08 21:51:21 +0000 | [diff] [blame] | 603 | getContext().getFunctionType(RetTy, ArgTypes, |
John McCall | db40c7f | 2010-12-14 08:05:40 +0000 | [diff] [blame] | 604 | FunctionProtoType::ExtProtoInfo()); |
Adrian Prantl | 42d71b9 | 2014-04-10 23:21:53 +0000 | [diff] [blame] | 605 | DI->EmitFunctionStart(GD, Loc, StartLoc, FnType, CurFn, Builder); |
Sanjiv Gupta | 1e8b608 | 2008-07-04 11:04:26 +0000 | [diff] [blame] | 606 | } |
| 607 | |
Daniel Dunbar | 468a8f8 | 2011-02-10 17:32:22 +0000 | [diff] [blame] | 608 | if (ShouldInstrumentFunction()) |
| 609 | EmitFunctionInstrumentation("__cyg_profile_func_enter"); |
Chris Lattner | 3c77a35 | 2010-06-22 00:03:40 +0000 | [diff] [blame] | 610 | |
Roman Divacky | 178e0160 | 2011-02-10 16:52:03 +0000 | [diff] [blame] | 611 | if (CGM.getCodeGenOpts().InstrumentForProfiling) |
| 612 | EmitMCountInstrumentation(); |
| 613 | |
Eli Friedman | 4b1942c | 2009-12-04 02:43:40 +0000 | [diff] [blame] | 614 | if (RetTy->isVoidType()) { |
| 615 | // Void type; nothing to return. |
| 616 | ReturnValue = 0; |
Adrian Prantl | 2cede0f | 2014-04-29 01:07:59 +0000 | [diff] [blame] | 617 | |
| 618 | // Count the implicit return. |
| 619 | if (!endsWithReturn(D)) |
| 620 | ++NumReturnExprs; |
Eli Friedman | 4b1942c | 2009-12-04 02:43:40 +0000 | [diff] [blame] | 621 | } else if (CurFnInfo->getReturnInfo().getKind() == ABIArgInfo::Indirect && |
John McCall | 47fb950 | 2013-03-07 21:37:08 +0000 | [diff] [blame] | 622 | !hasScalarEvaluationKind(CurFnInfo->getReturnType())) { |
Eli Friedman | 4b1942c | 2009-12-04 02:43:40 +0000 | [diff] [blame] | 623 | // Indirect aggregate return; emit returned value directly into sret slot. |
Daniel Dunbar | fd09df7 | 2010-02-16 19:45:20 +0000 | [diff] [blame] | 624 | // This reduces code size, and affects correctness in C++. |
Reid Kleckner | 37abaca | 2014-05-09 22:46:15 +0000 | [diff] [blame^] | 625 | auto AI = CurFn->arg_begin(); |
| 626 | if (CurFnInfo->getReturnInfo().isSRetAfterThis()) |
| 627 | ++AI; |
| 628 | ReturnValue = AI; |
Reid Kleckner | 314ef7b | 2014-02-01 00:04:45 +0000 | [diff] [blame] | 629 | } else if (CurFnInfo->getReturnInfo().getKind() == ABIArgInfo::InAlloca && |
| 630 | !hasScalarEvaluationKind(CurFnInfo->getReturnType())) { |
| 631 | // Load the sret pointer from the argument struct and return into that. |
| 632 | unsigned Idx = CurFnInfo->getReturnInfo().getInAllocaFieldIndex(); |
| 633 | llvm::Function::arg_iterator EI = CurFn->arg_end(); |
| 634 | --EI; |
| 635 | llvm::Value *Addr = Builder.CreateStructGEP(EI, Idx); |
| 636 | ReturnValue = Builder.CreateLoad(Addr, "agg.result"); |
Eli Friedman | 4b1942c | 2009-12-04 02:43:40 +0000 | [diff] [blame] | 637 | } else { |
Daniel Dunbar | fd09df7 | 2010-02-16 19:45:20 +0000 | [diff] [blame] | 638 | ReturnValue = CreateIRTemp(RetTy, "retval"); |
John McCall | 31168b0 | 2011-06-15 23:02:42 +0000 | [diff] [blame] | 639 | |
| 640 | // Tell the epilog emitter to autorelease the result. We do this |
| 641 | // now so that various specialized functions can suppress it |
| 642 | // during their IR-generation. |
David Blaikie | bbafb8a | 2012-03-11 07:00:24 +0000 | [diff] [blame] | 643 | if (getLangOpts().ObjCAutoRefCount && |
John McCall | 31168b0 | 2011-06-15 23:02:42 +0000 | [diff] [blame] | 644 | !CurFnInfo->isReturnsRetained() && |
| 645 | RetTy->isObjCRetainableType()) |
| 646 | AutoreleaseResult = true; |
Eli Friedman | 4b1942c | 2009-12-04 02:43:40 +0000 | [diff] [blame] | 647 | } |
| 648 | |
Mike Stump | 1d84921 | 2009-12-07 23:38:24 +0000 | [diff] [blame] | 649 | EmitStartEHSpec(CurCodeDecl); |
John McCall | 31168b0 | 2011-06-15 23:02:42 +0000 | [diff] [blame] | 650 | |
| 651 | PrologueCleanupDepth = EHStack.stable_begin(); |
Daniel Dunbar | d931a87 | 2009-02-02 22:03:45 +0000 | [diff] [blame] | 652 | EmitFunctionProlog(*CurFnInfo, CurFn, Args); |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 653 | |
Eli Friedman | 9fbeba0 | 2012-02-11 02:57:39 +0000 | [diff] [blame] | 654 | if (D && isa<CXXMethodDecl>(D) && cast<CXXMethodDecl>(D)->isInstance()) { |
John McCall | 5d865c32 | 2010-08-31 07:33:07 +0000 | [diff] [blame] | 655 | CGM.getCXXABI().EmitInstanceFunctionProlog(*this); |
Eli Friedman | 9fbeba0 | 2012-02-11 02:57:39 +0000 | [diff] [blame] | 656 | const CXXMethodDecl *MD = cast<CXXMethodDecl>(D); |
| 657 | if (MD->getParent()->isLambda() && |
| 658 | MD->getOverloadedOperator() == OO_Call) { |
| 659 | // We're in a lambda; figure out the captures. |
| 660 | MD->getParent()->getCaptureFields(LambdaCaptureFields, |
| 661 | LambdaThisCaptureField); |
| 662 | if (LambdaThisCaptureField) { |
| 663 | // If this lambda captures this, load it. |
John McCall | dec348f7 | 2013-05-03 07:33:41 +0000 | [diff] [blame] | 664 | LValue ThisLValue = EmitLValueForLambdaField(LambdaThisCaptureField); |
Nick Lewycky | 2d84e84 | 2013-10-02 02:29:49 +0000 | [diff] [blame] | 665 | CXXThisValue = EmitLoadOfLValue(ThisLValue, |
| 666 | SourceLocation()).getScalarVal(); |
Eli Friedman | 9fbeba0 | 2012-02-11 02:57:39 +0000 | [diff] [blame] | 667 | } |
| 668 | } else { |
| 669 | // Not in a lambda; just use 'this' from the method. |
| 670 | // FIXME: Should we generate a new load for each use of 'this'? The |
| 671 | // fast register allocator would be happier... |
| 672 | CXXThisValue = CXXABIThisValue; |
| 673 | } |
| 674 | } |
John McCall | 347132b | 2010-02-16 22:04:33 +0000 | [diff] [blame] | 675 | |
Anders Carlsson | c20879a | 2008-12-20 21:28:43 +0000 | [diff] [blame] | 676 | // If any of the arguments have a variably modified type, make sure to |
| 677 | // emit the type size. |
| 678 | for (FunctionArgList::const_iterator i = Args.begin(), e = Args.end(); |
| 679 | i != e; ++i) { |
Eli Friedman | 1f57683 | 2012-11-14 22:09:59 +0000 | [diff] [blame] | 680 | const VarDecl *VD = *i; |
| 681 | |
| 682 | // Dig out the type as written from ParmVarDecls; it's unclear whether |
| 683 | // the standard (C99 6.9.1p10) requires this, but we're following the |
| 684 | // precedent set by gcc. |
| 685 | QualType Ty; |
| 686 | if (const ParmVarDecl *PVD = dyn_cast<ParmVarDecl>(VD)) |
| 687 | Ty = PVD->getOriginalType(); |
| 688 | else |
| 689 | Ty = VD->getType(); |
Anders Carlsson | c20879a | 2008-12-20 21:28:43 +0000 | [diff] [blame] | 690 | |
| 691 | if (Ty->isVariablyModifiedType()) |
John McCall | 23c29fe | 2011-06-24 21:55:10 +0000 | [diff] [blame] | 692 | EmitVariablyModifiedType(Ty); |
Anders Carlsson | c20879a | 2008-12-20 21:28:43 +0000 | [diff] [blame] | 693 | } |
Eric Christopher | 7cdf948 | 2011-10-13 21:45:18 +0000 | [diff] [blame] | 694 | // Emit a location at the end of the prologue. |
| 695 | if (CGDebugInfo *DI = getDebugInfo()) |
| 696 | DI->EmitLocation(Builder, StartLoc); |
Daniel Dunbar | bc915f4 | 2008-09-09 23:14:03 +0000 | [diff] [blame] | 697 | } |
Eli Friedman | 3d421e1 | 2008-08-25 21:31:01 +0000 | [diff] [blame] | 698 | |
Richard Smith | b47c36f | 2013-11-05 09:12:18 +0000 | [diff] [blame] | 699 | void CodeGenFunction::EmitFunctionBody(FunctionArgList &Args, |
| 700 | const Stmt *Body) { |
Justin Bogner | ef512b9 | 2014-01-06 22:27:43 +0000 | [diff] [blame] | 701 | RegionCounter Cnt = getPGORegionCounter(Body); |
| 702 | Cnt.beginRegion(Builder); |
Richard Smith | b47c36f | 2013-11-05 09:12:18 +0000 | [diff] [blame] | 703 | if (const CompoundStmt *S = dyn_cast<CompoundStmt>(Body)) |
David Blaikie | 0a21d0d | 2013-01-26 22:16:26 +0000 | [diff] [blame] | 704 | EmitCompoundStmtWithoutScope(*S); |
| 705 | else |
Richard Smith | b47c36f | 2013-11-05 09:12:18 +0000 | [diff] [blame] | 706 | EmitStmt(Body); |
John McCall | 89b12b3 | 2010-02-18 03:17:58 +0000 | [diff] [blame] | 707 | } |
| 708 | |
Bob Wilson | bf854f0 | 2014-02-17 19:21:09 +0000 | [diff] [blame] | 709 | /// When instrumenting to collect profile data, the counts for some blocks |
| 710 | /// such as switch cases need to not include the fall-through counts, so |
| 711 | /// emit a branch around the instrumentation code. When not instrumenting, |
| 712 | /// this just calls EmitBlock(). |
| 713 | void CodeGenFunction::EmitBlockWithFallThrough(llvm::BasicBlock *BB, |
| 714 | RegionCounter &Cnt) { |
| 715 | llvm::BasicBlock *SkipCountBB = 0; |
| 716 | if (HaveInsertPoint() && CGM.getCodeGenOpts().ProfileInstrGenerate) { |
| 717 | // When instrumenting for profiling, the fallthrough to certain |
| 718 | // statements needs to skip over the instrumentation code so that we |
| 719 | // get an accurate count. |
| 720 | SkipCountBB = createBasicBlock("skipcount"); |
| 721 | EmitBranch(SkipCountBB); |
| 722 | } |
| 723 | EmitBlock(BB); |
| 724 | Cnt.beginRegion(Builder, /*AddIncomingFallThrough=*/true); |
| 725 | if (SkipCountBB) |
| 726 | EmitBlock(SkipCountBB); |
| 727 | } |
| 728 | |
John McCall | 8601a75 | 2010-08-03 22:46:07 +0000 | [diff] [blame] | 729 | /// Tries to mark the given function nounwind based on the |
| 730 | /// non-existence of any throwing calls within it. We believe this is |
| 731 | /// lightweight enough to do at -O0. |
| 732 | static void TryMarkNoThrow(llvm::Function *F) { |
John McCall | 5996699 | 2010-08-11 22:38:33 +0000 | [diff] [blame] | 733 | // LLVM treats 'nounwind' on a function as part of the type, so we |
| 734 | // can't do this on functions that can be overwritten. |
| 735 | if (F->mayBeOverridden()) return; |
| 736 | |
John McCall | 8601a75 | 2010-08-03 22:46:07 +0000 | [diff] [blame] | 737 | for (llvm::Function::iterator FI = F->begin(), FE = F->end(); FI != FE; ++FI) |
| 738 | for (llvm::BasicBlock::iterator |
| 739 | BI = FI->begin(), BE = FI->end(); BI != BE; ++BI) |
Bill Wendling | f0724e8 | 2011-09-19 20:31:14 +0000 | [diff] [blame] | 740 | if (llvm::CallInst *Call = dyn_cast<llvm::CallInst>(&*BI)) { |
John McCall | 8601a75 | 2010-08-03 22:46:07 +0000 | [diff] [blame] | 741 | if (!Call->doesNotThrow()) |
| 742 | return; |
Bill Wendling | f0724e8 | 2011-09-19 20:31:14 +0000 | [diff] [blame] | 743 | } else if (isa<llvm::ResumeInst>(&*BI)) { |
| 744 | return; |
| 745 | } |
Bill Wendling | 73e465e | 2012-10-10 03:13:20 +0000 | [diff] [blame] | 746 | F->setDoesNotThrow(); |
John McCall | 8601a75 | 2010-08-03 22:46:07 +0000 | [diff] [blame] | 747 | } |
| 748 | |
Richard Smith | b47c36f | 2013-11-05 09:12:18 +0000 | [diff] [blame] | 749 | static void EmitSizedDeallocationFunction(CodeGenFunction &CGF, |
| 750 | const FunctionDecl *UnsizedDealloc) { |
| 751 | // This is a weak discardable definition of the sized deallocation function. |
| 752 | CGF.CurFn->setLinkage(llvm::Function::LinkOnceAnyLinkage); |
| 753 | |
| 754 | // Call the unsized deallocation function and forward the first argument |
| 755 | // unchanged. |
| 756 | llvm::Constant *Unsized = CGF.CGM.GetAddrOfFunction(UnsizedDealloc); |
| 757 | CGF.Builder.CreateCall(Unsized, &*CGF.CurFn->arg_begin()); |
| 758 | } |
| 759 | |
John McCall | a738c25 | 2011-03-09 04:27:21 +0000 | [diff] [blame] | 760 | void CodeGenFunction::GenerateCode(GlobalDecl GD, llvm::Function *Fn, |
| 761 | const CGFunctionInfo &FnInfo) { |
Anders Carlsson | 73fcc95 | 2009-09-11 00:07:24 +0000 | [diff] [blame] | 762 | const FunctionDecl *FD = cast<FunctionDecl>(GD.getDecl()); |
Michael Ilseman | 686240a | 2012-12-04 00:29:55 +0000 | [diff] [blame] | 763 | |
Anders Carlsson | 63784f4 | 2009-02-13 08:11:52 +0000 | [diff] [blame] | 764 | // Check if we should generate debug info for this function. |
David Blaikie | 92848de | 2013-08-26 20:33:21 +0000 | [diff] [blame] | 765 | if (FD->hasAttr<NoDebugAttr>()) |
| 766 | DebugInfo = NULL; // disable debug info indefinitely for this function |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 767 | |
Daniel Dunbar | bc915f4 | 2008-09-09 23:14:03 +0000 | [diff] [blame] | 768 | FunctionArgList Args; |
Alp Toker | 314cc81 | 2014-01-25 16:55:45 +0000 | [diff] [blame] | 769 | QualType ResTy = FD->getReturnType(); |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 770 | |
Mike Stump | bee78dd | 2009-12-04 23:26:17 +0000 | [diff] [blame] | 771 | CurGD = GD; |
Reid Kleckner | 89077a1 | 2013-12-17 19:46:40 +0000 | [diff] [blame] | 772 | const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD); |
| 773 | if (MD && MD->isInstance()) { |
Stephen Lin | 9dc6eef | 2013-06-30 20:40:16 +0000 | [diff] [blame] | 774 | if (CGM.getCXXABI().HasThisReturn(GD)) |
| 775 | ResTy = MD->getThisType(getContext()); |
Reid Kleckner | 89077a1 | 2013-12-17 19:46:40 +0000 | [diff] [blame] | 776 | CGM.getCXXABI().buildThisParam(*this, Args); |
Stephen Lin | 9dc6eef | 2013-06-30 20:40:16 +0000 | [diff] [blame] | 777 | } |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 778 | |
Chad Rosier | f0cccf5 | 2012-02-18 00:37:07 +0000 | [diff] [blame] | 779 | for (unsigned i = 0, e = FD->getNumParams(); i != e; ++i) |
| 780 | Args.push_back(FD->getParamDecl(i)); |
Daniel Dunbar | 89654ee | 2008-08-26 08:29:31 +0000 | [diff] [blame] | 781 | |
Reid Kleckner | 89077a1 | 2013-12-17 19:46:40 +0000 | [diff] [blame] | 782 | if (MD && (isa<CXXConstructorDecl>(MD) || isa<CXXDestructorDecl>(MD))) |
| 783 | CGM.getCXXABI().addImplicitStructorParams(*this, ResTy, Args); |
| 784 | |
John McCall | 89b12b3 | 2010-02-18 03:17:58 +0000 | [diff] [blame] | 785 | SourceRange BodyRange; |
| 786 | if (Stmt *Body = FD->getBody()) BodyRange = Body->getSourceRange(); |
Adrian Prantl | dc237b5 | 2013-05-16 00:41:26 +0000 | [diff] [blame] | 787 | CurEHLocation = BodyRange.getEnd(); |
Anders Carlsson | 438cf92 | 2009-11-06 02:55:43 +0000 | [diff] [blame] | 788 | |
Adrian Prantl | 42d71b9 | 2014-04-10 23:21:53 +0000 | [diff] [blame] | 789 | // Use the location of the start of the function to determine where |
| 790 | // the function definition is located. By default use the location |
| 791 | // of the declaration as the location for the subprogram. A function |
| 792 | // may lack a declaration in the source code if it is created by code |
| 793 | // gen. (examples: _GLOBAL__I_a, __cxx_global_array_dtor, thunk). |
| 794 | SourceLocation Loc; |
| 795 | if (FD) { |
| 796 | Loc = FD->getLocation(); |
| 797 | |
| 798 | // If this is a function specialization then use the pattern body |
| 799 | // as the location for the function. |
| 800 | if (const FunctionDecl *SpecDecl = FD->getTemplateInstantiationPattern()) |
| 801 | if (SpecDecl->hasBody(SpecDecl)) |
| 802 | Loc = SpecDecl->getLocation(); |
| 803 | } |
| 804 | |
John McCall | 89b12b3 | 2010-02-18 03:17:58 +0000 | [diff] [blame] | 805 | // Emit the standard function prologue. |
Adrian Prantl | 42d71b9 | 2014-04-10 23:21:53 +0000 | [diff] [blame] | 806 | StartFunction(GD, ResTy, Fn, FnInfo, Args, Loc, BodyRange.getBegin()); |
Anders Carlsson | 438cf92 | 2009-11-06 02:55:43 +0000 | [diff] [blame] | 807 | |
John McCall | 89b12b3 | 2010-02-18 03:17:58 +0000 | [diff] [blame] | 808 | // Generate the body of the function. |
Bob Wilson | da1ebed | 2014-03-06 04:55:41 +0000 | [diff] [blame] | 809 | PGO.assignRegionCounters(GD.getDecl(), CurFn); |
John McCall | b81884d | 2010-02-19 09:25:03 +0000 | [diff] [blame] | 810 | if (isa<CXXDestructorDecl>(FD)) |
| 811 | EmitDestructorBody(Args); |
| 812 | else if (isa<CXXConstructorDecl>(FD)) |
| 813 | EmitConstructorBody(Args); |
Richard Smith | 9c6890a | 2012-11-01 22:30:59 +0000 | [diff] [blame] | 814 | else if (getLangOpts().CUDA && |
Peter Collingbourne | fa4d603 | 2011-10-06 18:51:56 +0000 | [diff] [blame] | 815 | !CGM.getCodeGenOpts().CUDAIsDevice && |
| 816 | FD->hasAttr<CUDAGlobalAttr>()) |
| 817 | CGM.getCUDARuntime().EmitDeviceStubBody(*this, Args); |
Eli Friedman | 5a6d507 | 2012-02-16 01:37:33 +0000 | [diff] [blame] | 818 | else if (isa<CXXConversionDecl>(FD) && |
Douglas Gregor | 355efbb | 2012-02-17 03:02:34 +0000 | [diff] [blame] | 819 | cast<CXXConversionDecl>(FD)->isLambdaToBlockPointerConversion()) { |
| 820 | // The lambda conversion to block pointer is special; the semantics can't be |
| 821 | // expressed in the AST, so IRGen needs to special-case it. |
| 822 | EmitLambdaToBlockPointerBody(Args); |
| 823 | } else if (isa<CXXMethodDecl>(FD) && |
| 824 | cast<CXXMethodDecl>(FD)->isLambdaStaticInvoker()) { |
Faisal Vali | 2b391ab | 2013-09-26 19:54:12 +0000 | [diff] [blame] | 825 | // The lambda static invoker function is special, because it forwards or |
Douglas Gregor | 355efbb | 2012-02-17 03:02:34 +0000 | [diff] [blame] | 826 | // clones the body of the function call operator (but is actually static). |
| 827 | EmitLambdaStaticInvokeFunction(cast<CXXMethodDecl>(FD)); |
Lang Hames | bf12274 | 2013-02-17 07:22:09 +0000 | [diff] [blame] | 828 | } else if (FD->isDefaulted() && isa<CXXMethodDecl>(FD) && |
Nick Lewycky | b39be1f | 2013-09-10 05:14:39 +0000 | [diff] [blame] | 829 | (cast<CXXMethodDecl>(FD)->isCopyAssignmentOperator() || |
| 830 | cast<CXXMethodDecl>(FD)->isMoveAssignmentOperator())) { |
Lang Hames | bf12274 | 2013-02-17 07:22:09 +0000 | [diff] [blame] | 831 | // Implicit copy-assignment gets the same special treatment as implicit |
| 832 | // copy-constructors. |
| 833 | emitImplicitAssignmentOperatorBody(Args); |
Richard Smith | b47c36f | 2013-11-05 09:12:18 +0000 | [diff] [blame] | 834 | } else if (Stmt *Body = FD->getBody()) { |
| 835 | EmitFunctionBody(Args, Body); |
| 836 | } else if (FunctionDecl *UnsizedDealloc = |
| 837 | FD->getCorrespondingUnsizedGlobalDeallocationFunction()) { |
| 838 | // Global sized deallocation functions get an implicit weak definition if |
| 839 | // they don't have an explicit definition. |
| 840 | EmitSizedDeallocationFunction(*this, UnsizedDealloc); |
| 841 | } else |
| 842 | llvm_unreachable("no definition for emitted function"); |
Anders Carlsson | ff8cce4 | 2010-02-07 19:45:40 +0000 | [diff] [blame] | 843 | |
Richard Smith | 9f9e582 | 2012-10-04 23:52:29 +0000 | [diff] [blame] | 844 | // C++11 [stmt.return]p2: |
| 845 | // Flowing off the end of a function [...] results in undefined behavior in |
| 846 | // a value-returning function. |
| 847 | // C11 6.9.1p12: |
| 848 | // If the '}' that terminates a function is reached, and the value of the |
| 849 | // function call is used by the caller, the behavior is undefined. |
Richard Smith | 9c6890a | 2012-11-01 22:30:59 +0000 | [diff] [blame] | 850 | if (getLangOpts().CPlusPlus && !FD->hasImplicitReturnZero() && |
Alp Toker | 314cc81 | 2014-01-25 16:55:45 +0000 | [diff] [blame] | 851 | !FD->getReturnType()->isVoidType() && Builder.GetInsertBlock()) { |
Will Dietz | f54319c | 2013-01-18 11:30:38 +0000 | [diff] [blame] | 852 | if (SanOpts->Return) |
Richard Smith | e30752c | 2012-10-09 19:52:38 +0000 | [diff] [blame] | 853 | EmitCheck(Builder.getFalse(), "missing_return", |
| 854 | EmitCheckSourceLocation(FD->getLocation()), |
Dmitri Gribenko | f857950 | 2013-01-12 19:30:44 +0000 | [diff] [blame] | 855 | ArrayRef<llvm::Value *>(), CRK_Unrecoverable); |
Richard Smith | 6b4ebcc | 2012-10-15 00:23:07 +0000 | [diff] [blame] | 856 | else if (CGM.getCodeGenOpts().OptimizationLevel == 0) |
| 857 | Builder.CreateCall(CGM.getIntrinsic(llvm::Intrinsic::trap)); |
Richard Smith | 9f9e582 | 2012-10-04 23:52:29 +0000 | [diff] [blame] | 858 | Builder.CreateUnreachable(); |
| 859 | Builder.ClearInsertionPoint(); |
| 860 | } |
| 861 | |
John McCall | 89b12b3 | 2010-02-18 03:17:58 +0000 | [diff] [blame] | 862 | // Emit the standard function epilogue. |
| 863 | FinishFunction(BodyRange.getEnd()); |
John McCall | 8601a75 | 2010-08-03 22:46:07 +0000 | [diff] [blame] | 864 | |
| 865 | // If we haven't marked the function nothrow through other means, do |
| 866 | // a quick pass now to see if we can. |
| 867 | if (!CurFn->doesNotThrow()) |
| 868 | TryMarkNoThrow(CurFn); |
Justin Bogner | ef512b9 | 2014-01-06 22:27:43 +0000 | [diff] [blame] | 869 | |
Duncan P. N. Exon Smith | 2fe531c | 2014-03-17 21:18:30 +0000 | [diff] [blame] | 870 | PGO.emitInstrumentationData(); |
Justin Bogner | ef512b9 | 2014-01-06 22:27:43 +0000 | [diff] [blame] | 871 | PGO.destroyRegionCounters(); |
Chris Lattner | 5696e7b | 2008-06-17 18:05:57 +0000 | [diff] [blame] | 872 | } |
| 873 | |
Chris Lattner | 5b1964b | 2008-11-11 07:41:27 +0000 | [diff] [blame] | 874 | /// ContainsLabel - Return true if the statement contains a label in it. If |
| 875 | /// this statement is not executed normally, it not containing a label means |
| 876 | /// that we can just remove the code. |
| 877 | bool CodeGenFunction::ContainsLabel(const Stmt *S, bool IgnoreCaseStmts) { |
| 878 | // Null statement, not a label! |
| 879 | if (S == 0) return false; |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 880 | |
Chris Lattner | 5b1964b | 2008-11-11 07:41:27 +0000 | [diff] [blame] | 881 | // If this is a label, we have to emit the code, consider something like: |
| 882 | // if (0) { ... foo: bar(); } goto foo; |
Chris Lattner | 29911cc | 2011-02-28 00:18:40 +0000 | [diff] [blame] | 883 | // |
| 884 | // TODO: If anyone cared, we could track __label__'s, since we know that you |
| 885 | // can't jump to one from outside their declared region. |
Chris Lattner | 5b1964b | 2008-11-11 07:41:27 +0000 | [diff] [blame] | 886 | if (isa<LabelStmt>(S)) |
| 887 | return true; |
Michael Ilseman | 686240a | 2012-12-04 00:29:55 +0000 | [diff] [blame] | 888 | |
Chris Lattner | 5b1964b | 2008-11-11 07:41:27 +0000 | [diff] [blame] | 889 | // If this is a case/default statement, and we haven't seen a switch, we have |
| 890 | // to emit the code. |
| 891 | if (isa<SwitchCase>(S) && !IgnoreCaseStmts) |
| 892 | return true; |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 893 | |
Chris Lattner | 5b1964b | 2008-11-11 07:41:27 +0000 | [diff] [blame] | 894 | // If this is a switch statement, we want to ignore cases below it. |
| 895 | if (isa<SwitchStmt>(S)) |
| 896 | IgnoreCaseStmts = true; |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 897 | |
Chris Lattner | 5b1964b | 2008-11-11 07:41:27 +0000 | [diff] [blame] | 898 | // Scan subexpressions for verboten labels. |
John McCall | 8322c3a | 2011-02-13 04:07:26 +0000 | [diff] [blame] | 899 | for (Stmt::const_child_range I = S->children(); I; ++I) |
Chris Lattner | 5b1964b | 2008-11-11 07:41:27 +0000 | [diff] [blame] | 900 | if (ContainsLabel(*I, IgnoreCaseStmts)) |
| 901 | return true; |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 902 | |
Chris Lattner | 5b1964b | 2008-11-11 07:41:27 +0000 | [diff] [blame] | 903 | return false; |
| 904 | } |
| 905 | |
Chris Lattner | 29911cc | 2011-02-28 00:18:40 +0000 | [diff] [blame] | 906 | /// containsBreak - Return true if the statement contains a break out of it. |
| 907 | /// If the statement (recursively) contains a switch or loop with a break |
| 908 | /// inside of it, this is fine. |
| 909 | bool CodeGenFunction::containsBreak(const Stmt *S) { |
| 910 | // Null statement, not a label! |
| 911 | if (S == 0) return false; |
| 912 | |
| 913 | // If this is a switch or loop that defines its own break scope, then we can |
| 914 | // include it and anything inside of it. |
| 915 | if (isa<SwitchStmt>(S) || isa<WhileStmt>(S) || isa<DoStmt>(S) || |
| 916 | isa<ForStmt>(S)) |
Chris Lattner | 30db828 | 2011-02-28 00:42:31 +0000 | [diff] [blame] | 917 | return false; |
Michael Ilseman | 686240a | 2012-12-04 00:29:55 +0000 | [diff] [blame] | 918 | |
Chris Lattner | 30db828 | 2011-02-28 00:42:31 +0000 | [diff] [blame] | 919 | if (isa<BreakStmt>(S)) |
Chris Lattner | 29911cc | 2011-02-28 00:18:40 +0000 | [diff] [blame] | 920 | return true; |
Michael Ilseman | 686240a | 2012-12-04 00:29:55 +0000 | [diff] [blame] | 921 | |
Chris Lattner | 29911cc | 2011-02-28 00:18:40 +0000 | [diff] [blame] | 922 | // Scan subexpressions for verboten breaks. |
| 923 | for (Stmt::const_child_range I = S->children(); I; ++I) |
| 924 | if (containsBreak(*I)) |
| 925 | return true; |
Michael Ilseman | 686240a | 2012-12-04 00:29:55 +0000 | [diff] [blame] | 926 | |
Chris Lattner | 29911cc | 2011-02-28 00:18:40 +0000 | [diff] [blame] | 927 | return false; |
| 928 | } |
| 929 | |
Chris Lattner | cd43929 | 2008-11-12 08:04:58 +0000 | [diff] [blame] | 930 | |
Chris Lattner | 41c6ab5 | 2011-02-27 23:02:32 +0000 | [diff] [blame] | 931 | /// ConstantFoldsToSimpleInteger - If the specified expression does not fold |
| 932 | /// to a constant, or if it does but contains a label, return false. If it |
| 933 | /// constant folds return true and set the boolean result in Result. |
| 934 | bool CodeGenFunction::ConstantFoldsToSimpleInteger(const Expr *Cond, |
| 935 | bool &ResultBool) { |
Richard Trieu | c320c74 | 2012-07-23 20:21:35 +0000 | [diff] [blame] | 936 | llvm::APSInt ResultInt; |
Chris Lattner | 29911cc | 2011-02-28 00:18:40 +0000 | [diff] [blame] | 937 | if (!ConstantFoldsToSimpleInteger(Cond, ResultInt)) |
| 938 | return false; |
Michael Ilseman | 686240a | 2012-12-04 00:29:55 +0000 | [diff] [blame] | 939 | |
Chris Lattner | 29911cc | 2011-02-28 00:18:40 +0000 | [diff] [blame] | 940 | ResultBool = ResultInt.getBoolValue(); |
| 941 | return true; |
| 942 | } |
| 943 | |
| 944 | /// ConstantFoldsToSimpleInteger - If the specified expression does not fold |
| 945 | /// to a constant, or if it does but contains a label, return false. If it |
| 946 | /// constant folds return true and set the folded value. |
| 947 | bool CodeGenFunction:: |
Richard Trieu | c320c74 | 2012-07-23 20:21:35 +0000 | [diff] [blame] | 948 | ConstantFoldsToSimpleInteger(const Expr *Cond, llvm::APSInt &ResultInt) { |
Daniel Dunbar | f32443c | 2008-11-12 22:37:10 +0000 | [diff] [blame] | 949 | // FIXME: Rename and handle conversion of other evaluatable things |
| 950 | // to bool. |
Richard Smith | 5fab0c9 | 2011-12-28 19:48:30 +0000 | [diff] [blame] | 951 | llvm::APSInt Int; |
| 952 | if (!Cond->EvaluateAsInt(Int, getContext())) |
Chris Lattner | 41c6ab5 | 2011-02-27 23:02:32 +0000 | [diff] [blame] | 953 | return false; // Not foldable, not integer or not fully evaluatable. |
Richard Smith | 5fab0c9 | 2011-12-28 19:48:30 +0000 | [diff] [blame] | 954 | |
Chris Lattner | cd43929 | 2008-11-12 08:04:58 +0000 | [diff] [blame] | 955 | if (CodeGenFunction::ContainsLabel(Cond)) |
Chris Lattner | 41c6ab5 | 2011-02-27 23:02:32 +0000 | [diff] [blame] | 956 | return false; // Contains a label. |
Richard Smith | 5fab0c9 | 2011-12-28 19:48:30 +0000 | [diff] [blame] | 957 | |
| 958 | ResultInt = Int; |
Chris Lattner | 41c6ab5 | 2011-02-27 23:02:32 +0000 | [diff] [blame] | 959 | return true; |
Chris Lattner | cd43929 | 2008-11-12 08:04:58 +0000 | [diff] [blame] | 960 | } |
| 961 | |
| 962 | |
Chris Lattner | 29911cc | 2011-02-28 00:18:40 +0000 | [diff] [blame] | 963 | |
Chris Lattner | cd43929 | 2008-11-12 08:04:58 +0000 | [diff] [blame] | 964 | /// EmitBranchOnBoolExpr - Emit a branch on a boolean condition (e.g. for an if |
| 965 | /// statement) to the specified blocks. Based on the condition, this might try |
| 966 | /// to simplify the codegen of the conditional based on the branch. |
| 967 | /// |
| 968 | void CodeGenFunction::EmitBranchOnBoolExpr(const Expr *Cond, |
| 969 | llvm::BasicBlock *TrueBlock, |
Justin Bogner | ef512b9 | 2014-01-06 22:27:43 +0000 | [diff] [blame] | 970 | llvm::BasicBlock *FalseBlock, |
| 971 | uint64_t TrueCount) { |
Peter Collingbourne | 9114759 | 2011-04-15 00:35:48 +0000 | [diff] [blame] | 972 | Cond = Cond->IgnoreParens(); |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 973 | |
Chris Lattner | cd43929 | 2008-11-12 08:04:58 +0000 | [diff] [blame] | 974 | if (const BinaryOperator *CondBOp = dyn_cast<BinaryOperator>(Cond)) { |
Justin Bogner | ef512b9 | 2014-01-06 22:27:43 +0000 | [diff] [blame] | 975 | |
Chris Lattner | cd43929 | 2008-11-12 08:04:58 +0000 | [diff] [blame] | 976 | // Handle X && Y in a condition. |
John McCall | e302792 | 2010-08-25 11:45:40 +0000 | [diff] [blame] | 977 | if (CondBOp->getOpcode() == BO_LAnd) { |
Bob Wilson | bf854f0 | 2014-02-17 19:21:09 +0000 | [diff] [blame] | 978 | RegionCounter Cnt = getPGORegionCounter(CondBOp); |
| 979 | |
Chris Lattner | cd43929 | 2008-11-12 08:04:58 +0000 | [diff] [blame] | 980 | // If we have "1 && X", simplify the code. "0 && X" would have constant |
| 981 | // folded if the case was simple enough. |
Bill Wendling | 6c9540e | 2011-03-04 21:46:03 +0000 | [diff] [blame] | 982 | bool ConstantBool = false; |
Chris Lattner | 41c6ab5 | 2011-02-27 23:02:32 +0000 | [diff] [blame] | 983 | if (ConstantFoldsToSimpleInteger(CondBOp->getLHS(), ConstantBool) && |
| 984 | ConstantBool) { |
Chris Lattner | cd43929 | 2008-11-12 08:04:58 +0000 | [diff] [blame] | 985 | // br(1 && X) -> br(X). |
Justin Bogner | ef512b9 | 2014-01-06 22:27:43 +0000 | [diff] [blame] | 986 | Cnt.beginRegion(Builder); |
| 987 | return EmitBranchOnBoolExpr(CondBOp->getRHS(), TrueBlock, FalseBlock, |
| 988 | TrueCount); |
Chris Lattner | cd43929 | 2008-11-12 08:04:58 +0000 | [diff] [blame] | 989 | } |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 990 | |
Chris Lattner | cd43929 | 2008-11-12 08:04:58 +0000 | [diff] [blame] | 991 | // If we have "X && 1", simplify the code to use an uncond branch. |
| 992 | // "X && 0" would have been constant folded to 0. |
Chris Lattner | 41c6ab5 | 2011-02-27 23:02:32 +0000 | [diff] [blame] | 993 | if (ConstantFoldsToSimpleInteger(CondBOp->getRHS(), ConstantBool) && |
| 994 | ConstantBool) { |
Chris Lattner | cd43929 | 2008-11-12 08:04:58 +0000 | [diff] [blame] | 995 | // br(X && 1) -> br(X). |
Justin Bogner | ef512b9 | 2014-01-06 22:27:43 +0000 | [diff] [blame] | 996 | return EmitBranchOnBoolExpr(CondBOp->getLHS(), TrueBlock, FalseBlock, |
| 997 | TrueCount); |
Chris Lattner | cd43929 | 2008-11-12 08:04:58 +0000 | [diff] [blame] | 998 | } |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 999 | |
Chris Lattner | cd43929 | 2008-11-12 08:04:58 +0000 | [diff] [blame] | 1000 | // Emit the LHS as a conditional. If the LHS conditional is false, we |
| 1001 | // want to jump to the FalseBlock. |
Daniel Dunbar | a612e79 | 2008-11-13 01:38:36 +0000 | [diff] [blame] | 1002 | llvm::BasicBlock *LHSTrue = createBasicBlock("land.lhs.true"); |
Justin Bogner | ef512b9 | 2014-01-06 22:27:43 +0000 | [diff] [blame] | 1003 | // The counter tells us how often we evaluate RHS, and all of TrueCount |
| 1004 | // can be propagated to that branch. |
| 1005 | uint64_t RHSCount = Cnt.getCount(); |
John McCall | ce1de61 | 2011-01-26 04:00:11 +0000 | [diff] [blame] | 1006 | |
| 1007 | ConditionalEvaluation eval(*this); |
Justin Bogner | ef512b9 | 2014-01-06 22:27:43 +0000 | [diff] [blame] | 1008 | EmitBranchOnBoolExpr(CondBOp->getLHS(), LHSTrue, FalseBlock, RHSCount); |
Chris Lattner | cd43929 | 2008-11-12 08:04:58 +0000 | [diff] [blame] | 1009 | EmitBlock(LHSTrue); |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1010 | |
Anders Carlsson | 60ddba6 | 2010-01-24 00:20:05 +0000 | [diff] [blame] | 1011 | // Any temporaries created here are conditional. |
Justin Bogner | ef512b9 | 2014-01-06 22:27:43 +0000 | [diff] [blame] | 1012 | Cnt.beginRegion(Builder); |
John McCall | ce1de61 | 2011-01-26 04:00:11 +0000 | [diff] [blame] | 1013 | eval.begin(*this); |
Justin Bogner | ef512b9 | 2014-01-06 22:27:43 +0000 | [diff] [blame] | 1014 | EmitBranchOnBoolExpr(CondBOp->getRHS(), TrueBlock, FalseBlock, TrueCount); |
John McCall | ce1de61 | 2011-01-26 04:00:11 +0000 | [diff] [blame] | 1015 | eval.end(*this); |
Anders Carlsson | 60ddba6 | 2010-01-24 00:20:05 +0000 | [diff] [blame] | 1016 | |
Chris Lattner | cd43929 | 2008-11-12 08:04:58 +0000 | [diff] [blame] | 1017 | return; |
Chris Lattner | 41c6ab5 | 2011-02-27 23:02:32 +0000 | [diff] [blame] | 1018 | } |
Michael Ilseman | 686240a | 2012-12-04 00:29:55 +0000 | [diff] [blame] | 1019 | |
Chris Lattner | 41c6ab5 | 2011-02-27 23:02:32 +0000 | [diff] [blame] | 1020 | if (CondBOp->getOpcode() == BO_LOr) { |
Bob Wilson | bf854f0 | 2014-02-17 19:21:09 +0000 | [diff] [blame] | 1021 | RegionCounter Cnt = getPGORegionCounter(CondBOp); |
| 1022 | |
Chris Lattner | cd43929 | 2008-11-12 08:04:58 +0000 | [diff] [blame] | 1023 | // If we have "0 || X", simplify the code. "1 || X" would have constant |
| 1024 | // folded if the case was simple enough. |
Bill Wendling | 6c9540e | 2011-03-04 21:46:03 +0000 | [diff] [blame] | 1025 | bool ConstantBool = false; |
Chris Lattner | 41c6ab5 | 2011-02-27 23:02:32 +0000 | [diff] [blame] | 1026 | if (ConstantFoldsToSimpleInteger(CondBOp->getLHS(), ConstantBool) && |
| 1027 | !ConstantBool) { |
Chris Lattner | cd43929 | 2008-11-12 08:04:58 +0000 | [diff] [blame] | 1028 | // br(0 || X) -> br(X). |
Justin Bogner | ef512b9 | 2014-01-06 22:27:43 +0000 | [diff] [blame] | 1029 | Cnt.beginRegion(Builder); |
| 1030 | return EmitBranchOnBoolExpr(CondBOp->getRHS(), TrueBlock, FalseBlock, |
| 1031 | TrueCount); |
Chris Lattner | cd43929 | 2008-11-12 08:04:58 +0000 | [diff] [blame] | 1032 | } |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1033 | |
Chris Lattner | cd43929 | 2008-11-12 08:04:58 +0000 | [diff] [blame] | 1034 | // If we have "X || 0", simplify the code to use an uncond branch. |
| 1035 | // "X || 1" would have been constant folded to 1. |
Chris Lattner | 41c6ab5 | 2011-02-27 23:02:32 +0000 | [diff] [blame] | 1036 | if (ConstantFoldsToSimpleInteger(CondBOp->getRHS(), ConstantBool) && |
| 1037 | !ConstantBool) { |
Chris Lattner | cd43929 | 2008-11-12 08:04:58 +0000 | [diff] [blame] | 1038 | // br(X || 0) -> br(X). |
Justin Bogner | ef512b9 | 2014-01-06 22:27:43 +0000 | [diff] [blame] | 1039 | return EmitBranchOnBoolExpr(CondBOp->getLHS(), TrueBlock, FalseBlock, |
| 1040 | TrueCount); |
Chris Lattner | cd43929 | 2008-11-12 08:04:58 +0000 | [diff] [blame] | 1041 | } |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1042 | |
Chris Lattner | cd43929 | 2008-11-12 08:04:58 +0000 | [diff] [blame] | 1043 | // Emit the LHS as a conditional. If the LHS conditional is true, we |
| 1044 | // want to jump to the TrueBlock. |
Daniel Dunbar | a612e79 | 2008-11-13 01:38:36 +0000 | [diff] [blame] | 1045 | llvm::BasicBlock *LHSFalse = createBasicBlock("lor.lhs.false"); |
Justin Bogner | ef512b9 | 2014-01-06 22:27:43 +0000 | [diff] [blame] | 1046 | // We have the count for entry to the RHS and for the whole expression |
| 1047 | // being true, so we can divy up True count between the short circuit and |
| 1048 | // the RHS. |
Justin Bogner | be614c7 | 2014-01-23 02:54:30 +0000 | [diff] [blame] | 1049 | uint64_t LHSCount = Cnt.getParentCount() - Cnt.getCount(); |
Justin Bogner | ef512b9 | 2014-01-06 22:27:43 +0000 | [diff] [blame] | 1050 | uint64_t RHSCount = TrueCount - LHSCount; |
John McCall | ce1de61 | 2011-01-26 04:00:11 +0000 | [diff] [blame] | 1051 | |
| 1052 | ConditionalEvaluation eval(*this); |
Justin Bogner | ef512b9 | 2014-01-06 22:27:43 +0000 | [diff] [blame] | 1053 | EmitBranchOnBoolExpr(CondBOp->getLHS(), TrueBlock, LHSFalse, LHSCount); |
Chris Lattner | cd43929 | 2008-11-12 08:04:58 +0000 | [diff] [blame] | 1054 | EmitBlock(LHSFalse); |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1055 | |
Anders Carlsson | 60ddba6 | 2010-01-24 00:20:05 +0000 | [diff] [blame] | 1056 | // Any temporaries created here are conditional. |
Justin Bogner | ef512b9 | 2014-01-06 22:27:43 +0000 | [diff] [blame] | 1057 | Cnt.beginRegion(Builder); |
John McCall | ce1de61 | 2011-01-26 04:00:11 +0000 | [diff] [blame] | 1058 | eval.begin(*this); |
Justin Bogner | ef512b9 | 2014-01-06 22:27:43 +0000 | [diff] [blame] | 1059 | EmitBranchOnBoolExpr(CondBOp->getRHS(), TrueBlock, FalseBlock, RHSCount); |
| 1060 | |
John McCall | ce1de61 | 2011-01-26 04:00:11 +0000 | [diff] [blame] | 1061 | eval.end(*this); |
Anders Carlsson | 60ddba6 | 2010-01-24 00:20:05 +0000 | [diff] [blame] | 1062 | |
Chris Lattner | cd43929 | 2008-11-12 08:04:58 +0000 | [diff] [blame] | 1063 | return; |
| 1064 | } |
Chris Lattner | d953773 | 2008-11-12 08:13:36 +0000 | [diff] [blame] | 1065 | } |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1066 | |
Chris Lattner | d953773 | 2008-11-12 08:13:36 +0000 | [diff] [blame] | 1067 | if (const UnaryOperator *CondUOp = dyn_cast<UnaryOperator>(Cond)) { |
| 1068 | // br(!x, t, f) -> br(x, f, t) |
Justin Bogner | ef512b9 | 2014-01-06 22:27:43 +0000 | [diff] [blame] | 1069 | if (CondUOp->getOpcode() == UO_LNot) { |
| 1070 | // Negate the count. |
| 1071 | uint64_t FalseCount = PGO.getCurrentRegionCount() - TrueCount; |
| 1072 | // Negate the condition and swap the destination blocks. |
| 1073 | return EmitBranchOnBoolExpr(CondUOp->getSubExpr(), FalseBlock, TrueBlock, |
| 1074 | FalseCount); |
| 1075 | } |
Chris Lattner | cd43929 | 2008-11-12 08:04:58 +0000 | [diff] [blame] | 1076 | } |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1077 | |
Daniel Dunbar | bf3c22e | 2008-11-12 10:30:32 +0000 | [diff] [blame] | 1078 | if (const ConditionalOperator *CondOp = dyn_cast<ConditionalOperator>(Cond)) { |
Eli Friedman | 248f898 | 2012-02-14 03:54:45 +0000 | [diff] [blame] | 1079 | // br(c ? x : y, t, f) -> br(c, br(x, t, f), br(y, t, f)) |
| 1080 | llvm::BasicBlock *LHSBlock = createBasicBlock("cond.true"); |
| 1081 | llvm::BasicBlock *RHSBlock = createBasicBlock("cond.false"); |
Daniel Dunbar | bf3c22e | 2008-11-12 10:30:32 +0000 | [diff] [blame] | 1082 | |
Justin Bogner | ef512b9 | 2014-01-06 22:27:43 +0000 | [diff] [blame] | 1083 | RegionCounter Cnt = getPGORegionCounter(CondOp); |
Eli Friedman | 248f898 | 2012-02-14 03:54:45 +0000 | [diff] [blame] | 1084 | ConditionalEvaluation cond(*this); |
Justin Bogner | ef512b9 | 2014-01-06 22:27:43 +0000 | [diff] [blame] | 1085 | EmitBranchOnBoolExpr(CondOp->getCond(), LHSBlock, RHSBlock, Cnt.getCount()); |
| 1086 | |
| 1087 | // When computing PGO branch weights, we only know the overall count for |
| 1088 | // the true block. This code is essentially doing tail duplication of the |
| 1089 | // naive code-gen, introducing new edges for which counts are not |
| 1090 | // available. Divide the counts proportionally between the LHS and RHS of |
| 1091 | // the conditional operator. |
| 1092 | uint64_t LHSScaledTrueCount = 0; |
| 1093 | if (TrueCount) { |
Bob Wilson | bf854f0 | 2014-02-17 19:21:09 +0000 | [diff] [blame] | 1094 | double LHSRatio = Cnt.getCount() / (double) Cnt.getParentCount(); |
Justin Bogner | ef512b9 | 2014-01-06 22:27:43 +0000 | [diff] [blame] | 1095 | LHSScaledTrueCount = TrueCount * LHSRatio; |
| 1096 | } |
John McCall | ce1de61 | 2011-01-26 04:00:11 +0000 | [diff] [blame] | 1097 | |
Eli Friedman | 248f898 | 2012-02-14 03:54:45 +0000 | [diff] [blame] | 1098 | cond.begin(*this); |
| 1099 | EmitBlock(LHSBlock); |
Justin Bogner | ef512b9 | 2014-01-06 22:27:43 +0000 | [diff] [blame] | 1100 | Cnt.beginRegion(Builder); |
| 1101 | EmitBranchOnBoolExpr(CondOp->getLHS(), TrueBlock, FalseBlock, |
| 1102 | LHSScaledTrueCount); |
Eli Friedman | 248f898 | 2012-02-14 03:54:45 +0000 | [diff] [blame] | 1103 | cond.end(*this); |
John McCall | ce1de61 | 2011-01-26 04:00:11 +0000 | [diff] [blame] | 1104 | |
Eli Friedman | 248f898 | 2012-02-14 03:54:45 +0000 | [diff] [blame] | 1105 | cond.begin(*this); |
| 1106 | EmitBlock(RHSBlock); |
Justin Bogner | ef512b9 | 2014-01-06 22:27:43 +0000 | [diff] [blame] | 1107 | EmitBranchOnBoolExpr(CondOp->getRHS(), TrueBlock, FalseBlock, |
| 1108 | TrueCount - LHSScaledTrueCount); |
Eli Friedman | 248f898 | 2012-02-14 03:54:45 +0000 | [diff] [blame] | 1109 | cond.end(*this); |
John McCall | ce1de61 | 2011-01-26 04:00:11 +0000 | [diff] [blame] | 1110 | |
Eli Friedman | 248f898 | 2012-02-14 03:54:45 +0000 | [diff] [blame] | 1111 | return; |
Daniel Dunbar | bf3c22e | 2008-11-12 10:30:32 +0000 | [diff] [blame] | 1112 | } |
| 1113 | |
Richard Smith | ea85232 | 2013-05-07 21:53:22 +0000 | [diff] [blame] | 1114 | if (const CXXThrowExpr *Throw = dyn_cast<CXXThrowExpr>(Cond)) { |
| 1115 | // Conditional operator handling can give us a throw expression as a |
| 1116 | // condition for a case like: |
| 1117 | // br(c ? throw x : y, t, f) -> br(c, br(throw x, t, f), br(y, t, f) |
| 1118 | // Fold this to: |
| 1119 | // br(c, throw x, br(y, t, f)) |
| 1120 | EmitCXXThrowExpr(Throw, /*KeepInsertionPoint*/false); |
| 1121 | return; |
| 1122 | } |
| 1123 | |
Justin Bogner | ef512b9 | 2014-01-06 22:27:43 +0000 | [diff] [blame] | 1124 | // Create branch weights based on the number of times we get here and the |
| 1125 | // number of times the condition should be true. |
Bob Wilson | bf854f0 | 2014-02-17 19:21:09 +0000 | [diff] [blame] | 1126 | uint64_t CurrentCount = std::max(PGO.getCurrentRegionCount(), TrueCount); |
Justin Bogner | ef512b9 | 2014-01-06 22:27:43 +0000 | [diff] [blame] | 1127 | llvm::MDNode *Weights = PGO.createBranchWeights(TrueCount, |
| 1128 | CurrentCount - TrueCount); |
| 1129 | |
Chris Lattner | cd43929 | 2008-11-12 08:04:58 +0000 | [diff] [blame] | 1130 | // Emit the code with the fully general case. |
| 1131 | llvm::Value *CondV = EvaluateExprAsBool(Cond); |
Justin Bogner | ef512b9 | 2014-01-06 22:27:43 +0000 | [diff] [blame] | 1132 | Builder.CreateCondBr(CondV, TrueBlock, FalseBlock, Weights); |
Chris Lattner | cd43929 | 2008-11-12 08:04:58 +0000 | [diff] [blame] | 1133 | } |
| 1134 | |
Daniel Dunbar | a7c8cf6 | 2008-08-16 00:56:44 +0000 | [diff] [blame] | 1135 | /// ErrorUnsupported - Print out an error that codegen doesn't support the |
Chris Lattner | fc94434 | 2007-12-02 01:43:38 +0000 | [diff] [blame] | 1136 | /// specified stmt yet. |
David Blaikie | 4a9ec7b | 2013-08-19 21:02:26 +0000 | [diff] [blame] | 1137 | void CodeGenFunction::ErrorUnsupported(const Stmt *S, const char *Type) { |
| 1138 | CGM.ErrorUnsupported(S, Type); |
Chris Lattner | fc94434 | 2007-12-02 01:43:38 +0000 | [diff] [blame] | 1139 | } |
| 1140 | |
John McCall | 2725aa1 | 2011-02-01 21:35:06 +0000 | [diff] [blame] | 1141 | /// emitNonZeroVLAInit - Emit the "zero" initialization of a |
| 1142 | /// variable-length array whose elements have a non-zero bit-pattern. |
| 1143 | /// |
James Dennett | be30245 | 2012-06-15 22:10:14 +0000 | [diff] [blame] | 1144 | /// \param baseType the inner-most element type of the array |
John McCall | 2725aa1 | 2011-02-01 21:35:06 +0000 | [diff] [blame] | 1145 | /// \param src - a char* pointing to the bit-pattern for a single |
| 1146 | /// base element of the array |
| 1147 | /// \param sizeInChars - the total size of the VLA, in chars |
John McCall | 2725aa1 | 2011-02-01 21:35:06 +0000 | [diff] [blame] | 1148 | static void emitNonZeroVLAInit(CodeGenFunction &CGF, QualType baseType, |
Michael Ilseman | 686240a | 2012-12-04 00:29:55 +0000 | [diff] [blame] | 1149 | llvm::Value *dest, llvm::Value *src, |
John McCall | 2725aa1 | 2011-02-01 21:35:06 +0000 | [diff] [blame] | 1150 | llvm::Value *sizeInChars) { |
| 1151 | std::pair<CharUnits,CharUnits> baseSizeAndAlign |
| 1152 | = CGF.getContext().getTypeInfoInChars(baseType); |
| 1153 | |
| 1154 | CGBuilderTy &Builder = CGF.Builder; |
| 1155 | |
| 1156 | llvm::Value *baseSizeInChars |
| 1157 | = llvm::ConstantInt::get(CGF.IntPtrTy, baseSizeAndAlign.first.getQuantity()); |
| 1158 | |
Chris Lattner | 2192fe5 | 2011-07-18 04:24:23 +0000 | [diff] [blame] | 1159 | llvm::Type *i8p = Builder.getInt8PtrTy(); |
John McCall | 2725aa1 | 2011-02-01 21:35:06 +0000 | [diff] [blame] | 1160 | |
| 1161 | llvm::Value *begin = Builder.CreateBitCast(dest, i8p, "vla.begin"); |
| 1162 | llvm::Value *end = Builder.CreateInBoundsGEP(dest, sizeInChars, "vla.end"); |
| 1163 | |
| 1164 | llvm::BasicBlock *originBB = CGF.Builder.GetInsertBlock(); |
| 1165 | llvm::BasicBlock *loopBB = CGF.createBasicBlock("vla-init.loop"); |
| 1166 | llvm::BasicBlock *contBB = CGF.createBasicBlock("vla-init.cont"); |
| 1167 | |
| 1168 | // Make a loop over the VLA. C99 guarantees that the VLA element |
| 1169 | // count must be nonzero. |
| 1170 | CGF.EmitBlock(loopBB); |
| 1171 | |
Jay Foad | 20c0f02 | 2011-03-30 11:28:58 +0000 | [diff] [blame] | 1172 | llvm::PHINode *cur = Builder.CreatePHI(i8p, 2, "vla.cur"); |
John McCall | 2725aa1 | 2011-02-01 21:35:06 +0000 | [diff] [blame] | 1173 | cur->addIncoming(begin, originBB); |
| 1174 | |
| 1175 | // memcpy the individual element bit-pattern. |
| 1176 | Builder.CreateMemCpy(cur, src, baseSizeInChars, |
| 1177 | baseSizeAndAlign.second.getQuantity(), |
| 1178 | /*volatile*/ false); |
| 1179 | |
| 1180 | // Go to the next element. |
| 1181 | llvm::Value *next = Builder.CreateConstInBoundsGEP1_32(cur, 1, "vla.next"); |
| 1182 | |
| 1183 | // Leave if that's the end of the VLA. |
| 1184 | llvm::Value *done = Builder.CreateICmpEQ(next, end, "vla-init.isdone"); |
| 1185 | Builder.CreateCondBr(done, contBB, loopBB); |
| 1186 | cur->addIncoming(next, loopBB); |
| 1187 | |
| 1188 | CGF.EmitBlock(contBB); |
Michael Ilseman | 686240a | 2012-12-04 00:29:55 +0000 | [diff] [blame] | 1189 | } |
John McCall | 2725aa1 | 2011-02-01 21:35:06 +0000 | [diff] [blame] | 1190 | |
Anders Carlsson | c0964b6 | 2010-05-22 17:35:42 +0000 | [diff] [blame] | 1191 | void |
| 1192 | CodeGenFunction::EmitNullInitialization(llvm::Value *DestPtr, QualType Ty) { |
Anders Carlsson | 16e94af | 2010-05-03 01:20:20 +0000 | [diff] [blame] | 1193 | // Ignore empty classes in C++. |
Richard Smith | 9c6890a | 2012-11-01 22:30:59 +0000 | [diff] [blame] | 1194 | if (getLangOpts().CPlusPlus) { |
Anders Carlsson | 16e94af | 2010-05-03 01:20:20 +0000 | [diff] [blame] | 1195 | if (const RecordType *RT = Ty->getAs<RecordType>()) { |
| 1196 | if (cast<CXXRecordDecl>(RT->getDecl())->isEmpty()) |
| 1197 | return; |
| 1198 | } |
| 1199 | } |
John McCall | 7cd1d97 | 2010-08-07 08:21:30 +0000 | [diff] [blame] | 1200 | |
| 1201 | // Cast the dest ptr to the appropriate i8 pointer type. |
| 1202 | unsigned DestAS = |
| 1203 | cast<llvm::PointerType>(DestPtr->getType())->getAddressSpace(); |
Chris Lattner | 2192fe5 | 2011-07-18 04:24:23 +0000 | [diff] [blame] | 1204 | llvm::Type *BP = Builder.getInt8PtrTy(DestAS); |
Anders Carlsson | 2e744e8 | 2008-08-30 19:51:14 +0000 | [diff] [blame] | 1205 | if (DestPtr->getType() != BP) |
Benjamin Kramer | 76399eb | 2011-09-27 21:06:10 +0000 | [diff] [blame] | 1206 | DestPtr = Builder.CreateBitCast(DestPtr, BP); |
Anders Carlsson | 2e744e8 | 2008-08-30 19:51:14 +0000 | [diff] [blame] | 1207 | |
| 1208 | // Get size and alignment info for this aggregate. |
Michael Ilseman | 686240a | 2012-12-04 00:29:55 +0000 | [diff] [blame] | 1209 | std::pair<CharUnits, CharUnits> TypeInfo = |
Ken Dyck | c5c416f | 2011-04-22 17:51:05 +0000 | [diff] [blame] | 1210 | getContext().getTypeInfoInChars(Ty); |
| 1211 | CharUnits Size = TypeInfo.first; |
| 1212 | CharUnits Align = TypeInfo.second; |
Anders Carlsson | 2e744e8 | 2008-08-30 19:51:14 +0000 | [diff] [blame] | 1213 | |
John McCall | a08ffd2 | 2011-01-14 10:37:58 +0000 | [diff] [blame] | 1214 | llvm::Value *SizeVal; |
John McCall | 2725aa1 | 2011-02-01 21:35:06 +0000 | [diff] [blame] | 1215 | const VariableArrayType *vla; |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1216 | |
John McCall | a08ffd2 | 2011-01-14 10:37:58 +0000 | [diff] [blame] | 1217 | // Don't bother emitting a zero-byte memset. |
Ken Dyck | c5c416f | 2011-04-22 17:51:05 +0000 | [diff] [blame] | 1218 | if (Size.isZero()) { |
John McCall | a08ffd2 | 2011-01-14 10:37:58 +0000 | [diff] [blame] | 1219 | // But note that getTypeInfo returns 0 for a VLA. |
| 1220 | if (const VariableArrayType *vlaType = |
| 1221 | dyn_cast_or_null<VariableArrayType>( |
| 1222 | getContext().getAsArrayType(Ty))) { |
John McCall | 23c29fe | 2011-06-24 21:55:10 +0000 | [diff] [blame] | 1223 | QualType eltType; |
| 1224 | llvm::Value *numElts; |
Benjamin Kramer | 867ea1d | 2014-03-02 13:01:17 +0000 | [diff] [blame] | 1225 | std::tie(numElts, eltType) = getVLASize(vlaType); |
John McCall | 23c29fe | 2011-06-24 21:55:10 +0000 | [diff] [blame] | 1226 | |
| 1227 | SizeVal = numElts; |
| 1228 | CharUnits eltSize = getContext().getTypeSizeInChars(eltType); |
| 1229 | if (!eltSize.isOne()) |
| 1230 | SizeVal = Builder.CreateNUWMul(SizeVal, CGM.getSize(eltSize)); |
John McCall | 2725aa1 | 2011-02-01 21:35:06 +0000 | [diff] [blame] | 1231 | vla = vlaType; |
John McCall | a08ffd2 | 2011-01-14 10:37:58 +0000 | [diff] [blame] | 1232 | } else { |
| 1233 | return; |
| 1234 | } |
| 1235 | } else { |
John McCall | 23c29fe | 2011-06-24 21:55:10 +0000 | [diff] [blame] | 1236 | SizeVal = CGM.getSize(Size); |
John McCall | 2725aa1 | 2011-02-01 21:35:06 +0000 | [diff] [blame] | 1237 | vla = 0; |
John McCall | a08ffd2 | 2011-01-14 10:37:58 +0000 | [diff] [blame] | 1238 | } |
John McCall | 7cd1d97 | 2010-08-07 08:21:30 +0000 | [diff] [blame] | 1239 | |
| 1240 | // If the type contains a pointer to data member we can't memset it to zero. |
| 1241 | // Instead, create a null constant and copy it to the destination. |
John McCall | 2725aa1 | 2011-02-01 21:35:06 +0000 | [diff] [blame] | 1242 | // TODO: there are other patterns besides zero that we can usefully memset, |
| 1243 | // like -1, which happens to be the pattern used by member-pointers. |
John McCall | 614dbdc | 2010-08-22 21:01:12 +0000 | [diff] [blame] | 1244 | if (!CGM.getTypes().isZeroInitializable(Ty)) { |
John McCall | 2725aa1 | 2011-02-01 21:35:06 +0000 | [diff] [blame] | 1245 | // For a VLA, emit a single element, then splat that over the VLA. |
| 1246 | if (vla) Ty = getContext().getBaseElementType(vla); |
John McCall | a08ffd2 | 2011-01-14 10:37:58 +0000 | [diff] [blame] | 1247 | |
John McCall | 7cd1d97 | 2010-08-07 08:21:30 +0000 | [diff] [blame] | 1248 | llvm::Constant *NullConstant = CGM.EmitNullConstant(Ty); |
| 1249 | |
Michael Ilseman | 686240a | 2012-12-04 00:29:55 +0000 | [diff] [blame] | 1250 | llvm::GlobalVariable *NullVariable = |
John McCall | 7cd1d97 | 2010-08-07 08:21:30 +0000 | [diff] [blame] | 1251 | new llvm::GlobalVariable(CGM.getModule(), NullConstant->getType(), |
Michael Ilseman | 686240a | 2012-12-04 00:29:55 +0000 | [diff] [blame] | 1252 | /*isConstant=*/true, |
John McCall | 7cd1d97 | 2010-08-07 08:21:30 +0000 | [diff] [blame] | 1253 | llvm::GlobalVariable::PrivateLinkage, |
Chris Lattner | 0e62c1c | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 1254 | NullConstant, Twine()); |
John McCall | 7cd1d97 | 2010-08-07 08:21:30 +0000 | [diff] [blame] | 1255 | llvm::Value *SrcPtr = |
| 1256 | Builder.CreateBitCast(NullVariable, Builder.getInt8PtrTy()); |
| 1257 | |
John McCall | 2725aa1 | 2011-02-01 21:35:06 +0000 | [diff] [blame] | 1258 | if (vla) return emitNonZeroVLAInit(*this, Ty, DestPtr, SrcPtr, SizeVal); |
| 1259 | |
John McCall | 7cd1d97 | 2010-08-07 08:21:30 +0000 | [diff] [blame] | 1260 | // Get and call the appropriate llvm.memcpy overload. |
Ken Dyck | c5c416f | 2011-04-22 17:51:05 +0000 | [diff] [blame] | 1261 | Builder.CreateMemCpy(DestPtr, SrcPtr, SizeVal, Align.getQuantity(), false); |
John McCall | 7cd1d97 | 2010-08-07 08:21:30 +0000 | [diff] [blame] | 1262 | return; |
Michael Ilseman | 686240a | 2012-12-04 00:29:55 +0000 | [diff] [blame] | 1263 | } |
| 1264 | |
John McCall | 7cd1d97 | 2010-08-07 08:21:30 +0000 | [diff] [blame] | 1265 | // Otherwise, just memset the whole thing to zero. This is legal |
| 1266 | // because in LLVM, all default initializers (other than the ones we just |
| 1267 | // handled above) are guaranteed to have a bit pattern of all zeros. |
Michael Ilseman | 686240a | 2012-12-04 00:29:55 +0000 | [diff] [blame] | 1268 | Builder.CreateMemSet(DestPtr, Builder.getInt8(0), SizeVal, |
Ken Dyck | c5c416f | 2011-04-22 17:51:05 +0000 | [diff] [blame] | 1269 | Align.getQuantity(), false); |
Anders Carlsson | 2e744e8 | 2008-08-30 19:51:14 +0000 | [diff] [blame] | 1270 | } |
| 1271 | |
Chris Lattner | c8e630e | 2011-02-17 07:39:24 +0000 | [diff] [blame] | 1272 | llvm::BlockAddress *CodeGenFunction::GetAddrOfLabel(const LabelDecl *L) { |
Chris Lattner | 6c4d255 | 2009-10-28 23:59:40 +0000 | [diff] [blame] | 1273 | // Make sure that there is a block for the indirect goto. |
| 1274 | if (IndirectBranch == 0) |
| 1275 | GetIndirectGotoBlock(); |
Michael Ilseman | 686240a | 2012-12-04 00:29:55 +0000 | [diff] [blame] | 1276 | |
John McCall | ad5d61e | 2010-07-23 21:56:41 +0000 | [diff] [blame] | 1277 | llvm::BasicBlock *BB = getJumpDestForLabel(L).getBlock(); |
Michael Ilseman | 686240a | 2012-12-04 00:29:55 +0000 | [diff] [blame] | 1278 | |
Chris Lattner | 6c4d255 | 2009-10-28 23:59:40 +0000 | [diff] [blame] | 1279 | // Make sure the indirect branch includes all of the address-taken blocks. |
| 1280 | IndirectBranch->addDestination(BB); |
| 1281 | return llvm::BlockAddress::get(CurFn, BB); |
Chris Lattner | 2bb5cb4 | 2009-10-13 06:55:33 +0000 | [diff] [blame] | 1282 | } |
| 1283 | |
| 1284 | llvm::BasicBlock *CodeGenFunction::GetIndirectGotoBlock() { |
Chris Lattner | 6c4d255 | 2009-10-28 23:59:40 +0000 | [diff] [blame] | 1285 | // If we already made the indirect branch for indirect goto, return its block. |
| 1286 | if (IndirectBranch) return IndirectBranch->getParent(); |
Michael Ilseman | 686240a | 2012-12-04 00:29:55 +0000 | [diff] [blame] | 1287 | |
Chris Lattner | 6c4d255 | 2009-10-28 23:59:40 +0000 | [diff] [blame] | 1288 | CGBuilderTy TmpBuilder(createBasicBlock("indirectgoto")); |
Michael Ilseman | 686240a | 2012-12-04 00:29:55 +0000 | [diff] [blame] | 1289 | |
Chris Lattner | 2bb5cb4 | 2009-10-13 06:55:33 +0000 | [diff] [blame] | 1290 | // Create the PHI node that indirect gotos will add entries to. |
Jay Foad | 20c0f02 | 2011-03-30 11:28:58 +0000 | [diff] [blame] | 1291 | llvm::Value *DestVal = TmpBuilder.CreatePHI(Int8PtrTy, 0, |
| 1292 | "indirect.goto.dest"); |
Michael Ilseman | 686240a | 2012-12-04 00:29:55 +0000 | [diff] [blame] | 1293 | |
Chris Lattner | 6c4d255 | 2009-10-28 23:59:40 +0000 | [diff] [blame] | 1294 | // Create the indirect branch instruction. |
| 1295 | IndirectBranch = TmpBuilder.CreateIndirectBr(DestVal); |
| 1296 | return IndirectBranch->getParent(); |
Daniel Dunbar | 88402ce | 2008-08-04 16:51:22 +0000 | [diff] [blame] | 1297 | } |
Anders Carlsson | 13abd7e | 2008-11-04 05:30:00 +0000 | [diff] [blame] | 1298 | |
John McCall | 82fe67b | 2011-07-09 01:37:26 +0000 | [diff] [blame] | 1299 | /// Computes the length of an array in elements, as well as the base |
| 1300 | /// element type and a properly-typed first element pointer. |
| 1301 | llvm::Value *CodeGenFunction::emitArrayLength(const ArrayType *origArrayType, |
| 1302 | QualType &baseType, |
| 1303 | llvm::Value *&addr) { |
| 1304 | const ArrayType *arrayType = origArrayType; |
| 1305 | |
| 1306 | // If it's a VLA, we have to load the stored size. Note that |
| 1307 | // this is the size of the VLA in bytes, not its size in elements. |
| 1308 | llvm::Value *numVLAElements = 0; |
| 1309 | if (isa<VariableArrayType>(arrayType)) { |
| 1310 | numVLAElements = getVLASize(cast<VariableArrayType>(arrayType)).first; |
| 1311 | |
| 1312 | // Walk into all VLAs. This doesn't require changes to addr, |
| 1313 | // which has type T* where T is the first non-VLA element type. |
| 1314 | do { |
| 1315 | QualType elementType = arrayType->getElementType(); |
| 1316 | arrayType = getContext().getAsArrayType(elementType); |
| 1317 | |
| 1318 | // If we only have VLA components, 'addr' requires no adjustment. |
| 1319 | if (!arrayType) { |
| 1320 | baseType = elementType; |
| 1321 | return numVLAElements; |
| 1322 | } |
| 1323 | } while (isa<VariableArrayType>(arrayType)); |
| 1324 | |
| 1325 | // We get out here only if we find a constant array type |
| 1326 | // inside the VLA. |
| 1327 | } |
| 1328 | |
| 1329 | // We have some number of constant-length arrays, so addr should |
| 1330 | // have LLVM type [M x [N x [...]]]*. Build a GEP that walks |
| 1331 | // down to the first element of addr. |
Chris Lattner | 0e62c1c | 2011-07-23 10:55:15 +0000 | [diff] [blame] | 1332 | SmallVector<llvm::Value*, 8> gepIndices; |
John McCall | 82fe67b | 2011-07-09 01:37:26 +0000 | [diff] [blame] | 1333 | |
| 1334 | // GEP down to the array type. |
| 1335 | llvm::ConstantInt *zero = Builder.getInt32(0); |
| 1336 | gepIndices.push_back(zero); |
| 1337 | |
John McCall | 82fe67b | 2011-07-09 01:37:26 +0000 | [diff] [blame] | 1338 | uint64_t countFromCLAs = 1; |
Richard Smith | f3c37e8 | 2012-04-22 05:51:36 +0000 | [diff] [blame] | 1339 | QualType eltType; |
John McCall | 82fe67b | 2011-07-09 01:37:26 +0000 | [diff] [blame] | 1340 | |
Chris Lattner | 2192fe5 | 2011-07-18 04:24:23 +0000 | [diff] [blame] | 1341 | llvm::ArrayType *llvmArrayType = |
Richard Smith | f3c37e8 | 2012-04-22 05:51:36 +0000 | [diff] [blame] | 1342 | dyn_cast<llvm::ArrayType>( |
John McCall | 82fe67b | 2011-07-09 01:37:26 +0000 | [diff] [blame] | 1343 | cast<llvm::PointerType>(addr->getType())->getElementType()); |
Richard Smith | f3c37e8 | 2012-04-22 05:51:36 +0000 | [diff] [blame] | 1344 | while (llvmArrayType) { |
John McCall | 82fe67b | 2011-07-09 01:37:26 +0000 | [diff] [blame] | 1345 | assert(isa<ConstantArrayType>(arrayType)); |
| 1346 | assert(cast<ConstantArrayType>(arrayType)->getSize().getZExtValue() |
| 1347 | == llvmArrayType->getNumElements()); |
| 1348 | |
| 1349 | gepIndices.push_back(zero); |
| 1350 | countFromCLAs *= llvmArrayType->getNumElements(); |
Richard Smith | f3c37e8 | 2012-04-22 05:51:36 +0000 | [diff] [blame] | 1351 | eltType = arrayType->getElementType(); |
John McCall | 82fe67b | 2011-07-09 01:37:26 +0000 | [diff] [blame] | 1352 | |
| 1353 | llvmArrayType = |
| 1354 | dyn_cast<llvm::ArrayType>(llvmArrayType->getElementType()); |
John McCall | 82fe67b | 2011-07-09 01:37:26 +0000 | [diff] [blame] | 1355 | arrayType = getContext().getAsArrayType(arrayType->getElementType()); |
Richard Smith | f3c37e8 | 2012-04-22 05:51:36 +0000 | [diff] [blame] | 1356 | assert((!llvmArrayType || arrayType) && |
| 1357 | "LLVM and Clang types are out-of-synch"); |
John McCall | 82fe67b | 2011-07-09 01:37:26 +0000 | [diff] [blame] | 1358 | } |
| 1359 | |
Richard Smith | f3c37e8 | 2012-04-22 05:51:36 +0000 | [diff] [blame] | 1360 | if (arrayType) { |
| 1361 | // From this point onwards, the Clang array type has been emitted |
| 1362 | // as some other type (probably a packed struct). Compute the array |
| 1363 | // size, and just emit the 'begin' expression as a bitcast. |
| 1364 | while (arrayType) { |
| 1365 | countFromCLAs *= |
| 1366 | cast<ConstantArrayType>(arrayType)->getSize().getZExtValue(); |
| 1367 | eltType = arrayType->getElementType(); |
| 1368 | arrayType = getContext().getAsArrayType(eltType); |
| 1369 | } |
John McCall | 82fe67b | 2011-07-09 01:37:26 +0000 | [diff] [blame] | 1370 | |
Micah Villmow | ea2fea2 | 2012-10-25 15:39:14 +0000 | [diff] [blame] | 1371 | unsigned AddressSpace = addr->getType()->getPointerAddressSpace(); |
Richard Smith | f3c37e8 | 2012-04-22 05:51:36 +0000 | [diff] [blame] | 1372 | llvm::Type *BaseType = ConvertType(eltType)->getPointerTo(AddressSpace); |
| 1373 | addr = Builder.CreateBitCast(addr, BaseType, "array.begin"); |
| 1374 | } else { |
| 1375 | // Create the actual GEP. |
| 1376 | addr = Builder.CreateInBoundsGEP(addr, gepIndices, "array.begin"); |
| 1377 | } |
| 1378 | |
| 1379 | baseType = eltType; |
John McCall | 82fe67b | 2011-07-09 01:37:26 +0000 | [diff] [blame] | 1380 | |
| 1381 | llvm::Value *numElements |
| 1382 | = llvm::ConstantInt::get(SizeTy, countFromCLAs); |
| 1383 | |
| 1384 | // If we had any VLA dimensions, factor them in. |
| 1385 | if (numVLAElements) |
| 1386 | numElements = Builder.CreateNUWMul(numVLAElements, numElements); |
| 1387 | |
| 1388 | return numElements; |
| 1389 | } |
| 1390 | |
John McCall | 23c29fe | 2011-06-24 21:55:10 +0000 | [diff] [blame] | 1391 | std::pair<llvm::Value*, QualType> |
| 1392 | CodeGenFunction::getVLASize(QualType type) { |
| 1393 | const VariableArrayType *vla = getContext().getAsVariableArrayType(type); |
| 1394 | assert(vla && "type was not a variable array type!"); |
| 1395 | return getVLASize(vla); |
Anders Carlsson | e388a5b | 2008-12-20 20:27:15 +0000 | [diff] [blame] | 1396 | } |
Anders Carlsson | ccbe920 | 2008-12-12 07:19:02 +0000 | [diff] [blame] | 1397 | |
John McCall | 23c29fe | 2011-06-24 21:55:10 +0000 | [diff] [blame] | 1398 | std::pair<llvm::Value*, QualType> |
| 1399 | CodeGenFunction::getVLASize(const VariableArrayType *type) { |
| 1400 | // The number of elements so far; always size_t. |
| 1401 | llvm::Value *numElements = 0; |
| 1402 | |
| 1403 | QualType elementType; |
| 1404 | do { |
| 1405 | elementType = type->getElementType(); |
| 1406 | llvm::Value *vlaSize = VLASizeMap[type->getSizeExpr()]; |
| 1407 | assert(vlaSize && "no size for VLA!"); |
| 1408 | assert(vlaSize->getType() == SizeTy); |
| 1409 | |
| 1410 | if (!numElements) { |
| 1411 | numElements = vlaSize; |
| 1412 | } else { |
| 1413 | // 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] | 1414 | // FIXME: Teach -fsanitize=undefined to trap this. |
John McCall | 23c29fe | 2011-06-24 21:55:10 +0000 | [diff] [blame] | 1415 | numElements = Builder.CreateNUWMul(numElements, vlaSize); |
| 1416 | } |
| 1417 | } while ((type = getContext().getAsVariableArrayType(elementType))); |
| 1418 | |
| 1419 | return std::pair<llvm::Value*,QualType>(numElements, elementType); |
| 1420 | } |
| 1421 | |
| 1422 | void CodeGenFunction::EmitVariablyModifiedType(QualType type) { |
| 1423 | assert(type->isVariablyModifiedType() && |
Anders Carlsson | 8a01b79 | 2008-12-20 20:46:34 +0000 | [diff] [blame] | 1424 | "Must pass variably modified type to EmitVLASizes!"); |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1425 | |
Daniel Dunbar | b6adc43 | 2009-07-19 06:58:07 +0000 | [diff] [blame] | 1426 | EnsureInsertPoint(); |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1427 | |
John McCall | 23c29fe | 2011-06-24 21:55:10 +0000 | [diff] [blame] | 1428 | // We're going to walk down into the type and look for VLA |
| 1429 | // expressions. |
John McCall | 23c29fe | 2011-06-24 21:55:10 +0000 | [diff] [blame] | 1430 | do { |
| 1431 | assert(type->isVariablyModifiedType()); |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1432 | |
John McCall | 23c29fe | 2011-06-24 21:55:10 +0000 | [diff] [blame] | 1433 | const Type *ty = type.getTypePtr(); |
| 1434 | switch (ty->getTypeClass()) { |
Abramo Bagnara | 1cd8368 | 2012-01-07 10:52:36 +0000 | [diff] [blame] | 1435 | |
John McCall | 23c29fe | 2011-06-24 21:55:10 +0000 | [diff] [blame] | 1436 | #define TYPE(Class, Base) |
| 1437 | #define ABSTRACT_TYPE(Class, Base) |
Abramo Bagnara | 1cd8368 | 2012-01-07 10:52:36 +0000 | [diff] [blame] | 1438 | #define NON_CANONICAL_TYPE(Class, Base) |
John McCall | 23c29fe | 2011-06-24 21:55:10 +0000 | [diff] [blame] | 1439 | #define DEPENDENT_TYPE(Class, Base) case Type::Class: |
Abramo Bagnara | 1cd8368 | 2012-01-07 10:52:36 +0000 | [diff] [blame] | 1440 | #define NON_CANONICAL_UNLESS_DEPENDENT_TYPE(Class, Base) |
John McCall | 23c29fe | 2011-06-24 21:55:10 +0000 | [diff] [blame] | 1441 | #include "clang/AST/TypeNodes.def" |
Abramo Bagnara | 1cd8368 | 2012-01-07 10:52:36 +0000 | [diff] [blame] | 1442 | llvm_unreachable("unexpected dependent type!"); |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1443 | |
John McCall | 23c29fe | 2011-06-24 21:55:10 +0000 | [diff] [blame] | 1444 | // These types are never variably-modified. |
| 1445 | case Type::Builtin: |
| 1446 | case Type::Complex: |
| 1447 | case Type::Vector: |
| 1448 | case Type::ExtVector: |
| 1449 | case Type::Record: |
| 1450 | case Type::Enum: |
Abramo Bagnara | fa95ed4 | 2012-01-11 08:19:46 +0000 | [diff] [blame] | 1451 | case Type::Elaborated: |
| 1452 | case Type::TemplateSpecialization: |
John McCall | 23c29fe | 2011-06-24 21:55:10 +0000 | [diff] [blame] | 1453 | case Type::ObjCObject: |
| 1454 | case Type::ObjCInterface: |
| 1455 | case Type::ObjCObjectPointer: |
| 1456 | llvm_unreachable("type class is never variably-modified!"); |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1457 | |
Reid Kleckner | 0503a87 | 2013-12-05 01:23:43 +0000 | [diff] [blame] | 1458 | case Type::Adjusted: |
| 1459 | type = cast<AdjustedType>(ty)->getAdjustedType(); |
| 1460 | break; |
| 1461 | |
Reid Kleckner | 8a36502 | 2013-06-24 17:51:48 +0000 | [diff] [blame] | 1462 | case Type::Decayed: |
| 1463 | type = cast<DecayedType>(ty)->getPointeeType(); |
| 1464 | break; |
| 1465 | |
John McCall | 23c29fe | 2011-06-24 21:55:10 +0000 | [diff] [blame] | 1466 | case Type::Pointer: |
| 1467 | type = cast<PointerType>(ty)->getPointeeType(); |
| 1468 | break; |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1469 | |
John McCall | 23c29fe | 2011-06-24 21:55:10 +0000 | [diff] [blame] | 1470 | case Type::BlockPointer: |
| 1471 | type = cast<BlockPointerType>(ty)->getPointeeType(); |
| 1472 | break; |
| 1473 | |
| 1474 | case Type::LValueReference: |
| 1475 | case Type::RValueReference: |
| 1476 | type = cast<ReferenceType>(ty)->getPointeeType(); |
| 1477 | break; |
| 1478 | |
| 1479 | case Type::MemberPointer: |
| 1480 | type = cast<MemberPointerType>(ty)->getPointeeType(); |
| 1481 | break; |
| 1482 | |
| 1483 | case Type::ConstantArray: |
| 1484 | case Type::IncompleteArray: |
| 1485 | // Losing element qualification here is fine. |
| 1486 | type = cast<ArrayType>(ty)->getElementType(); |
| 1487 | break; |
| 1488 | |
| 1489 | case Type::VariableArray: { |
| 1490 | // Losing element qualification here is fine. |
| 1491 | const VariableArrayType *vat = cast<VariableArrayType>(ty); |
| 1492 | |
| 1493 | // Unknown size indication requires no size computation. |
| 1494 | // Otherwise, evaluate and record it. |
| 1495 | if (const Expr *size = vat->getSizeExpr()) { |
| 1496 | // It's possible that we might have emitted this already, |
| 1497 | // e.g. with a typedef and a pointer to it. |
| 1498 | llvm::Value *&entry = VLASizeMap[size]; |
| 1499 | if (!entry) { |
Richard Smith | 481652b | 2012-10-10 01:11:12 +0000 | [diff] [blame] | 1500 | llvm::Value *Size = EmitScalarExpr(size); |
| 1501 | |
| 1502 | // C11 6.7.6.2p5: |
| 1503 | // If the size is an expression that is not an integer constant |
| 1504 | // expression [...] each time it is evaluated it shall have a value |
| 1505 | // greater than zero. |
Will Dietz | f54319c | 2013-01-18 11:30:38 +0000 | [diff] [blame] | 1506 | if (SanOpts->VLABound && |
Richard Smith | b1b0ab4 | 2012-11-05 22:21:05 +0000 | [diff] [blame] | 1507 | size->getType()->isSignedIntegerType()) { |
Richard Smith | 481652b | 2012-10-10 01:11:12 +0000 | [diff] [blame] | 1508 | llvm::Value *Zero = llvm::Constant::getNullValue(Size->getType()); |
| 1509 | llvm::Constant *StaticArgs[] = { |
| 1510 | EmitCheckSourceLocation(size->getLocStart()), |
| 1511 | EmitCheckTypeDescriptor(size->getType()) |
| 1512 | }; |
| 1513 | EmitCheck(Builder.CreateICmpSGT(Size, Zero), |
Will Dietz | 88e0233 | 2012-12-02 19:50:33 +0000 | [diff] [blame] | 1514 | "vla_bound_not_positive", StaticArgs, Size, |
| 1515 | CRK_Recoverable); |
Richard Smith | 481652b | 2012-10-10 01:11:12 +0000 | [diff] [blame] | 1516 | } |
| 1517 | |
John McCall | 23c29fe | 2011-06-24 21:55:10 +0000 | [diff] [blame] | 1518 | // Always zexting here would be wrong if it weren't |
| 1519 | // undefined behavior to have a negative bound. |
Richard Smith | 8772bd8 | 2012-10-10 01:12:11 +0000 | [diff] [blame] | 1520 | entry = Builder.CreateIntCast(Size, SizeTy, /*signed*/ false); |
John McCall | 23c29fe | 2011-06-24 21:55:10 +0000 | [diff] [blame] | 1521 | } |
| 1522 | } |
| 1523 | type = vat->getElementType(); |
| 1524 | break; |
Anders Carlsson | 8a01b79 | 2008-12-20 20:46:34 +0000 | [diff] [blame] | 1525 | } |
Mike Stump | 11289f4 | 2009-09-09 15:08:12 +0000 | [diff] [blame] | 1526 | |
Abramo Bagnara | 1cd8368 | 2012-01-07 10:52:36 +0000 | [diff] [blame] | 1527 | case Type::FunctionProto: |
John McCall | 23c29fe | 2011-06-24 21:55:10 +0000 | [diff] [blame] | 1528 | case Type::FunctionNoProto: |
Alp Toker | 314cc81 | 2014-01-25 16:55:45 +0000 | [diff] [blame] | 1529 | type = cast<FunctionType>(ty)->getReturnType(); |
John McCall | 23c29fe | 2011-06-24 21:55:10 +0000 | [diff] [blame] | 1530 | break; |
Eli Friedman | 0dfb889 | 2011-10-06 23:00:33 +0000 | [diff] [blame] | 1531 | |
Abramo Bagnara | fa95ed4 | 2012-01-11 08:19:46 +0000 | [diff] [blame] | 1532 | case Type::Paren: |
| 1533 | case Type::TypeOf: |
| 1534 | case Type::UnaryTransform: |
| 1535 | case Type::Attributed: |
| 1536 | case Type::SubstTemplateTypeParm: |
David Blaikie | 66ed89d | 2013-07-13 21:08:08 +0000 | [diff] [blame] | 1537 | case Type::PackExpansion: |
Abramo Bagnara | fa95ed4 | 2012-01-11 08:19:46 +0000 | [diff] [blame] | 1538 | // Keep walking after single level desugaring. |
| 1539 | type = type.getSingleStepDesugaredType(getContext()); |
| 1540 | break; |
| 1541 | |
| 1542 | case Type::Typedef: |
| 1543 | case Type::Decltype: |
| 1544 | case Type::Auto: |
| 1545 | // Stop walking: nothing to do. |
| 1546 | return; |
| 1547 | |
| 1548 | case Type::TypeOfExpr: |
| 1549 | // Stop walking: emit typeof expression. |
| 1550 | EmitIgnoredExpr(cast<TypeOfExprType>(ty)->getUnderlyingExpr()); |
| 1551 | return; |
| 1552 | |
Eli Friedman | 0dfb889 | 2011-10-06 23:00:33 +0000 | [diff] [blame] | 1553 | case Type::Atomic: |
| 1554 | type = cast<AtomicType>(ty)->getValueType(); |
| 1555 | break; |
John McCall | 23c29fe | 2011-06-24 21:55:10 +0000 | [diff] [blame] | 1556 | } |
| 1557 | } while (type->isVariablyModifiedType()); |
Anders Carlsson | ccbe920 | 2008-12-12 07:19:02 +0000 | [diff] [blame] | 1558 | } |
Eli Friedman | ddea0ad | 2009-01-20 17:46:04 +0000 | [diff] [blame] | 1559 | |
| 1560 | llvm::Value* CodeGenFunction::EmitVAListRef(const Expr* E) { |
Dan Gohman | e9e32dc | 2010-10-29 22:47:07 +0000 | [diff] [blame] | 1561 | if (getContext().getBuiltinVaListType()->isArrayType()) |
Eli Friedman | ddea0ad | 2009-01-20 17:46:04 +0000 | [diff] [blame] | 1562 | return EmitScalarExpr(E); |
Eli Friedman | ddea0ad | 2009-01-20 17:46:04 +0000 | [diff] [blame] | 1563 | return EmitLValue(E).getAddress(); |
| 1564 | } |
Anders Carlsson | 15cb75a | 2009-02-07 22:53:43 +0000 | [diff] [blame] | 1565 | |
Yunzhong Gao | 0ebf1bb | 2013-08-30 08:53:09 +0000 | [diff] [blame] | 1566 | void CodeGenFunction::EmitDeclRefExprDbgValue(const DeclRefExpr *E, |
| 1567 | llvm::Constant *Init) { |
Devang Patel | dc866e1 | 2010-08-10 17:53:33 +0000 | [diff] [blame] | 1568 | assert (Init && "Invalid DeclRefExpr initializer!"); |
Yunzhong Gao | 0ebf1bb | 2013-08-30 08:53:09 +0000 | [diff] [blame] | 1569 | if (CGDebugInfo *Dbg = getDebugInfo()) |
| 1570 | if (CGM.getCodeGenOpts().getDebugInfo() >= CodeGenOptions::LimitedDebugInfo) |
| 1571 | Dbg->EmitGlobalVariable(E->getDecl(), Init); |
Devang Patel | e03edfd | 2010-08-10 07:24:25 +0000 | [diff] [blame] | 1572 | } |
John McCall | c07a0c7 | 2011-02-17 10:25:35 +0000 | [diff] [blame] | 1573 | |
| 1574 | CodeGenFunction::PeepholeProtection |
| 1575 | CodeGenFunction::protectFromPeepholes(RValue rvalue) { |
| 1576 | // At the moment, the only aggressive peephole we do in IR gen |
| 1577 | // is trunc(zext) folding, but if we add more, we can easily |
| 1578 | // extend this protection. |
| 1579 | |
| 1580 | if (!rvalue.isScalar()) return PeepholeProtection(); |
| 1581 | llvm::Value *value = rvalue.getScalarVal(); |
| 1582 | if (!isa<llvm::ZExtInst>(value)) return PeepholeProtection(); |
| 1583 | |
| 1584 | // Just make an extra bitcast. |
| 1585 | assert(HaveInsertPoint()); |
| 1586 | llvm::Instruction *inst = new llvm::BitCastInst(value, value->getType(), "", |
| 1587 | Builder.GetInsertBlock()); |
| 1588 | |
| 1589 | PeepholeProtection protection; |
| 1590 | protection.Inst = inst; |
| 1591 | return protection; |
| 1592 | } |
| 1593 | |
| 1594 | void CodeGenFunction::unprotectFromPeepholes(PeepholeProtection protection) { |
| 1595 | if (!protection.Inst) return; |
| 1596 | |
| 1597 | // In theory, we could try to duplicate the peepholes now, but whatever. |
| 1598 | protection.Inst->eraseFromParent(); |
| 1599 | } |
Julien Lerouge | 5a6b698 | 2011-09-09 22:41:49 +0000 | [diff] [blame] | 1600 | |
| 1601 | llvm::Value *CodeGenFunction::EmitAnnotationCall(llvm::Value *AnnotationFn, |
| 1602 | llvm::Value *AnnotatedVal, |
Dmitri Gribenko | f857950 | 2013-01-12 19:30:44 +0000 | [diff] [blame] | 1603 | StringRef AnnotationStr, |
Julien Lerouge | 5a6b698 | 2011-09-09 22:41:49 +0000 | [diff] [blame] | 1604 | SourceLocation Location) { |
| 1605 | llvm::Value *Args[4] = { |
| 1606 | AnnotatedVal, |
| 1607 | Builder.CreateBitCast(CGM.EmitAnnotationString(AnnotationStr), Int8PtrTy), |
| 1608 | Builder.CreateBitCast(CGM.EmitAnnotationUnit(Location), Int8PtrTy), |
| 1609 | CGM.EmitAnnotationLineNo(Location) |
| 1610 | }; |
| 1611 | return Builder.CreateCall(AnnotationFn, Args); |
| 1612 | } |
| 1613 | |
| 1614 | void CodeGenFunction::EmitVarAnnotations(const VarDecl *D, llvm::Value *V) { |
| 1615 | assert(D->hasAttr<AnnotateAttr>() && "no annotate attribute"); |
| 1616 | // FIXME We create a new bitcast for every annotation because that's what |
| 1617 | // llvm-gcc was doing. |
Aaron Ballman | be22bcb | 2014-03-10 17:08:28 +0000 | [diff] [blame] | 1618 | for (const auto *I : D->specific_attrs<AnnotateAttr>()) |
Julien Lerouge | 5a6b698 | 2011-09-09 22:41:49 +0000 | [diff] [blame] | 1619 | EmitAnnotationCall(CGM.getIntrinsic(llvm::Intrinsic::var_annotation), |
| 1620 | Builder.CreateBitCast(V, CGM.Int8PtrTy, V->getName()), |
Aaron Ballman | be22bcb | 2014-03-10 17:08:28 +0000 | [diff] [blame] | 1621 | I->getAnnotation(), D->getLocation()); |
Julien Lerouge | 5a6b698 | 2011-09-09 22:41:49 +0000 | [diff] [blame] | 1622 | } |
| 1623 | |
| 1624 | llvm::Value *CodeGenFunction::EmitFieldAnnotations(const FieldDecl *D, |
| 1625 | llvm::Value *V) { |
| 1626 | assert(D->hasAttr<AnnotateAttr>() && "no annotate attribute"); |
| 1627 | llvm::Type *VTy = V->getType(); |
| 1628 | llvm::Value *F = CGM.getIntrinsic(llvm::Intrinsic::ptr_annotation, |
| 1629 | CGM.Int8PtrTy); |
| 1630 | |
Aaron Ballman | be22bcb | 2014-03-10 17:08:28 +0000 | [diff] [blame] | 1631 | for (const auto *I : D->specific_attrs<AnnotateAttr>()) { |
Julien Lerouge | 5a6b698 | 2011-09-09 22:41:49 +0000 | [diff] [blame] | 1632 | // FIXME Always emit the cast inst so we can differentiate between |
| 1633 | // annotation on the first field of a struct and annotation on the struct |
| 1634 | // itself. |
| 1635 | if (VTy != CGM.Int8PtrTy) |
| 1636 | V = Builder.Insert(new llvm::BitCastInst(V, CGM.Int8PtrTy)); |
Aaron Ballman | be22bcb | 2014-03-10 17:08:28 +0000 | [diff] [blame] | 1637 | V = EmitAnnotationCall(F, V, I->getAnnotation(), D->getLocation()); |
Julien Lerouge | 5a6b698 | 2011-09-09 22:41:49 +0000 | [diff] [blame] | 1638 | V = Builder.CreateBitCast(V, VTy); |
| 1639 | } |
| 1640 | |
| 1641 | return V; |
| 1642 | } |
Ben Langmuir | 3b4c30b | 2013-05-09 19:17:11 +0000 | [diff] [blame] | 1643 | |
| 1644 | CodeGenFunction::CGCapturedStmtInfo::~CGCapturedStmtInfo() { } |