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Chris Lattnerbed31442007-05-28 01:07:47 +00001//===--- CodeGenFunction.cpp - Emit LLVM Code from ASTs for a Function ----===//
2//
3// The LLVM Compiler Infrastructure
4//
Chris Lattner5b12ab82007-12-29 19:59:25 +00005// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
Chris Lattnerbed31442007-05-28 01:07:47 +00007//
8//===----------------------------------------------------------------------===//
9//
10// This coordinates the per-function state used while generating code.
11//
12//===----------------------------------------------------------------------===//
13
14#include "CodeGenFunction.h"
John McCall7f416cc2015-09-08 08:05:57 +000015#include "CGBlocks.h"
David Majnemerdc012fa2015-04-22 21:38:15 +000016#include "CGCleanup.h"
Peter Collingbournefa4d6032011-10-06 18:51:56 +000017#include "CGCUDARuntime.h"
John McCall5d865c322010-08-31 07:33:07 +000018#include "CGCXXABI.h"
Eli Friedman17630752008-05-22 01:40:10 +000019#include "CGDebugInfo.h"
Alexey Bataev9959db52014-05-06 10:08:46 +000020#include "CGOpenMPRuntime.h"
Chandler Carruth3a022472012-12-04 09:13:33 +000021#include "CodeGenModule.h"
Justin Bogneref512b92014-01-06 22:27:43 +000022#include "CodeGenPGO.h"
Peter Collingbourneb453cd62013-10-20 21:29:19 +000023#include "TargetInfo.h"
Daniel Dunbarad319a72008-08-11 05:00:27 +000024#include "clang/AST/ASTContext.h"
Daniel Dunbar6e8aa532008-08-11 05:35:13 +000025#include "clang/AST/Decl.h"
Anders Carlsson468fa632009-04-04 20:47:02 +000026#include "clang/AST/DeclCXX.h"
Mike Stumpbee78dd2009-12-04 23:26:17 +000027#include "clang/AST/StmtCXX.h"
Sanjay Patela24296b2015-09-02 20:01:30 +000028#include "clang/Basic/Builtins.h"
Chandler Carruth3a022472012-12-04 09:13:33 +000029#include "clang/Basic/TargetInfo.h"
Mark Laceya8e7df32013-10-30 21:53:58 +000030#include "clang/CodeGen/CGFunctionInfo.h"
Chris Lattner3c77a352010-06-22 00:03:40 +000031#include "clang/Frontend/CodeGenOptions.h"
Eric Christopherfbfd97e2015-11-12 00:44:07 +000032#include "clang/Sema/SemaDiagnostic.h"
Chandler Carruthffd55512013-01-02 11:45:17 +000033#include "llvm/IR/DataLayout.h"
34#include "llvm/IR/Intrinsics.h"
35#include "llvm/IR/MDBuilder.h"
36#include "llvm/IR/Operator.h"
Chris Lattnerbed31442007-05-28 01:07:47 +000037using namespace clang;
38using namespace CodeGen;
39
Fariborz Jahanian63628032012-06-26 16:06:38 +000040CodeGenFunction::CodeGenFunction(CodeGenModule &cgm, bool suppressNewContext)
David Blaikie92848de2013-08-26 20:33:21 +000041 : CodeGenTypeCache(cgm), CGM(cgm), Target(cgm.getTarget()),
John McCall7f416cc2015-09-08 08:05:57 +000042 Builder(cgm, cgm.getModule().getContext(), llvm::ConstantFolder(),
David Blaikie8e90d222014-10-14 17:09:38 +000043 CGBuilderInserterTy(this)),
John McCall7f416cc2015-09-08 08:05:57 +000044 CurFn(nullptr), ReturnValue(Address::invalid()),
45 CapturedStmtInfo(nullptr),
Alexey Samsonov035462c2014-10-30 19:33:44 +000046 SanOpts(CGM.getLangOpts().Sanitize), IsSanitizerScope(false),
David Blaikie8e90d222014-10-14 17:09:38 +000047 CurFuncIsThunk(false), AutoreleaseResult(false), SawAsmBlock(false),
John McCall7f416cc2015-09-08 08:05:57 +000048 IsOutlinedSEHHelper(false),
49 BlockInfo(nullptr), BlockPointer(nullptr),
Reid Kleckner19819442014-07-25 21:39:46 +000050 LambdaThisCaptureField(nullptr), NormalCleanupDest(nullptr),
51 NextCleanupDestIndex(1), FirstBlockInfo(nullptr), EHResumeBlock(nullptr),
Reid Kleckneraca01db2015-02-04 22:37:07 +000052 ExceptionSlot(nullptr), EHSelectorSlot(nullptr),
Reid Kleckner9fe7f232015-07-07 00:36:30 +000053 DebugInfo(CGM.getModuleDebugInfo()),
54 DisableDebugInfo(false), DidCallStackSave(false), IndirectBranch(nullptr),
55 PGO(cgm), SwitchInsn(nullptr), SwitchWeights(nullptr),
56 CaseRangeBlock(nullptr), UnreachableBlock(nullptr), NumReturnExprs(0),
57 NumSimpleReturnExprs(0), CXXABIThisDecl(nullptr),
58 CXXABIThisValue(nullptr), CXXThisValue(nullptr),
John McCall7f416cc2015-09-08 08:05:57 +000059 CXXStructorImplicitParamDecl(nullptr),
Craig Topper8a13c412014-05-21 05:09:00 +000060 CXXStructorImplicitParamValue(nullptr), OutermostConditional(nullptr),
61 CurLexicalScope(nullptr), TerminateLandingPad(nullptr),
62 TerminateHandler(nullptr), TrapBB(nullptr) {
Fariborz Jahanian63628032012-06-26 16:06:38 +000063 if (!suppressNewContext)
64 CGM.getCXXABI().getMangleContext().startNewFunction();
Michael Ilseman7a167ee2012-12-04 00:36:06 +000065
66 llvm::FastMathFlags FMF;
67 if (CGM.getLangOpts().FastMath)
Benjamin Kramer7464efc2012-12-09 21:58:24 +000068 FMF.setUnsafeAlgebra();
Michael Ilseman7a167ee2012-12-04 00:36:06 +000069 if (CGM.getLangOpts().FiniteMathOnly) {
Benjamin Kramer7464efc2012-12-09 21:58:24 +000070 FMF.setNoNaNs();
71 FMF.setNoInfs();
Michael Ilseman7a167ee2012-12-04 00:36:06 +000072 }
Pekka Jaaskelainen37014502014-12-10 16:41:14 +000073 if (CGM.getCodeGenOpts().NoNaNsFPMath) {
74 FMF.setNoNaNs();
75 }
76 if (CGM.getCodeGenOpts().NoSignedZeros) {
77 FMF.setNoSignedZeros();
78 }
Sanjay Patel359b1052015-04-09 15:03:23 +000079 if (CGM.getCodeGenOpts().ReciprocalMath) {
80 FMF.setAllowReciprocal();
81 }
Michael Ilseman7a167ee2012-12-04 00:36:06 +000082 Builder.SetFastMathFlags(FMF);
Chris Lattner5696e7b2008-06-17 18:05:57 +000083}
Chris Lattnerd1af2d22007-05-29 23:17:50 +000084
John McCall08ef4662011-11-10 08:15:53 +000085CodeGenFunction::~CodeGenFunction() {
Richard Smith736a9472013-06-12 20:42:33 +000086 assert(LifetimeExtendedCleanupStack.empty() && "failed to emit a cleanup");
87
John McCall08ef4662011-11-10 08:15:53 +000088 // If there are any unclaimed block infos, go ahead and destroy them
89 // now. This can happen if IR-gen gets clever and skips evaluating
90 // something.
91 if (FirstBlockInfo)
92 destroyBlockInfos(FirstBlockInfo);
Alexey Bataev9959db52014-05-06 10:08:46 +000093
94 if (getLangOpts().OpenMP) {
Alexey Bataev3eff5f42015-02-25 08:32:46 +000095 CGM.getOpenMPRuntime().functionFinished(*this);
Alexey Bataev9959db52014-05-06 10:08:46 +000096 }
John McCall08ef4662011-11-10 08:15:53 +000097}
98
John McCall7f416cc2015-09-08 08:05:57 +000099CharUnits CodeGenFunction::getNaturalPointeeTypeAlignment(QualType T,
100 AlignmentSource *Source) {
101 return getNaturalTypeAlignment(T->getPointeeType(), Source,
102 /*forPointee*/ true);
David Majnemer99281062014-09-18 22:05:54 +0000103}
Chris Lattnerd1af2d22007-05-29 23:17:50 +0000104
John McCall7f416cc2015-09-08 08:05:57 +0000105CharUnits CodeGenFunction::getNaturalTypeAlignment(QualType T,
106 AlignmentSource *Source,
107 bool forPointeeType) {
108 // Honor alignment typedef attributes even on incomplete types.
109 // We also honor them straight for C++ class types, even as pointees;
110 // there's an expressivity gap here.
111 if (auto TT = T->getAs<TypedefType>()) {
112 if (auto Align = TT->getDecl()->getMaxAlignment()) {
113 if (Source) *Source = AlignmentSource::AttributedType;
114 return getContext().toCharUnitsFromBits(Align);
115 }
116 }
117
118 if (Source) *Source = AlignmentSource::Type;
119
120 CharUnits Alignment;
David Majnemer9df56372015-09-10 21:52:00 +0000121 if (T->isIncompleteType()) {
John McCall7f416cc2015-09-08 08:05:57 +0000122 Alignment = CharUnits::One(); // Shouldn't be used, but pessimistic is best.
123 } else {
124 // For C++ class pointees, we don't know whether we're pointing at a
125 // base or a complete object, so we generally need to use the
126 // non-virtual alignment.
127 const CXXRecordDecl *RD;
128 if (forPointeeType && (RD = T->getAsCXXRecordDecl())) {
129 Alignment = CGM.getClassPointerAlignment(RD);
130 } else {
131 Alignment = getContext().getTypeAlignInChars(T);
132 }
133
134 // Cap to the global maximum type alignment unless the alignment
135 // was somehow explicit on the type.
136 if (unsigned MaxAlign = getLangOpts().MaxTypeAlign) {
137 if (Alignment.getQuantity() > MaxAlign &&
138 !getContext().isAlignmentRequired(T))
139 Alignment = CharUnits::fromQuantity(MaxAlign);
140 }
141 }
142 return Alignment;
143}
144
145LValue CodeGenFunction::MakeNaturalAlignAddrLValue(llvm::Value *V, QualType T) {
146 AlignmentSource AlignSource;
147 CharUnits Alignment = getNaturalTypeAlignment(T, &AlignSource);
148 return LValue::MakeAddr(Address(V, Alignment), T, getContext(), AlignSource,
149 CGM.getTBAAInfo(T));
150}
151
152/// Given a value of type T* that may not be to a complete object,
153/// construct an l-value with the natural pointee alignment of T.
154LValue
155CodeGenFunction::MakeNaturalAlignPointeeAddrLValue(llvm::Value *V, QualType T) {
156 AlignmentSource AlignSource;
157 CharUnits Align = getNaturalTypeAlignment(T, &AlignSource, /*pointee*/ true);
158 return MakeAddrLValue(Address(V, Align), T, AlignSource);
159}
160
161
Chris Lattnera5f58b02011-07-09 17:41:47 +0000162llvm::Type *CodeGenFunction::ConvertTypeForMem(QualType T) {
Daniel Dunbaree3da872009-02-03 23:03:55 +0000163 return CGM.getTypes().ConvertTypeForMem(T);
164}
165
Chris Lattnera5f58b02011-07-09 17:41:47 +0000166llvm::Type *CodeGenFunction::ConvertType(QualType T) {
Chris Lattnerf033c142007-06-22 19:05:19 +0000167 return CGM.getTypes().ConvertType(T);
Chris Lattner45bb9142007-06-09 02:28:57 +0000168}
Chris Lattnerd1af2d22007-05-29 23:17:50 +0000169
John McCall47fb9502013-03-07 21:37:08 +0000170TypeEvaluationKind CodeGenFunction::getEvaluationKind(QualType type) {
171 type = type.getCanonicalType();
172 while (true) {
173 switch (type->getTypeClass()) {
John McCall745ae282011-05-15 02:34:36 +0000174#define TYPE(name, parent)
175#define ABSTRACT_TYPE(name, parent)
176#define NON_CANONICAL_TYPE(name, parent) case Type::name:
177#define DEPENDENT_TYPE(name, parent) case Type::name:
178#define NON_CANONICAL_UNLESS_DEPENDENT_TYPE(name, parent) case Type::name:
179#include "clang/AST/TypeNodes.def"
John McCall47fb9502013-03-07 21:37:08 +0000180 llvm_unreachable("non-canonical or dependent type in IR-generation");
John McCall745ae282011-05-15 02:34:36 +0000181
Richard Smith27d807c2013-04-30 13:56:41 +0000182 case Type::Auto:
183 llvm_unreachable("undeduced auto type in IR-generation");
184
John McCall47fb9502013-03-07 21:37:08 +0000185 // Various scalar types.
186 case Type::Builtin:
187 case Type::Pointer:
188 case Type::BlockPointer:
189 case Type::LValueReference:
190 case Type::RValueReference:
191 case Type::MemberPointer:
192 case Type::Vector:
193 case Type::ExtVector:
194 case Type::FunctionProto:
195 case Type::FunctionNoProto:
196 case Type::Enum:
197 case Type::ObjCObjectPointer:
Xiuli Pan9c14e282016-01-09 12:53:17 +0000198 case Type::Pipe:
John McCall47fb9502013-03-07 21:37:08 +0000199 return TEK_Scalar;
John McCall745ae282011-05-15 02:34:36 +0000200
John McCall47fb9502013-03-07 21:37:08 +0000201 // Complexes.
202 case Type::Complex:
203 return TEK_Complex;
Eli Friedman0dfb8892011-10-06 23:00:33 +0000204
John McCall47fb9502013-03-07 21:37:08 +0000205 // Arrays, records, and Objective-C objects.
206 case Type::ConstantArray:
207 case Type::IncompleteArray:
208 case Type::VariableArray:
209 case Type::Record:
210 case Type::ObjCObject:
211 case Type::ObjCInterface:
212 return TEK_Aggregate;
213
214 // We operate on atomic values according to their underlying type.
215 case Type::Atomic:
216 type = cast<AtomicType>(type)->getValueType();
217 continue;
218 }
219 llvm_unreachable("unknown type kind!");
John McCall745ae282011-05-15 02:34:36 +0000220 }
Chris Lattner54fb19e2007-06-22 22:02:34 +0000221}
222
David Blaikie66e41972015-01-14 07:38:27 +0000223llvm::DebugLoc CodeGenFunction::EmitReturnBlock() {
Daniel Dunbarfd346a32009-01-26 23:27:52 +0000224 // For cleanliness, we try to avoid emitting the return block for
225 // simple cases.
226 llvm::BasicBlock *CurBB = Builder.GetInsertBlock();
227
228 if (CurBB) {
229 assert(!CurBB->getTerminator() && "Unexpected terminated block.");
230
Daniel Dunbarea3060a2009-07-19 08:24:34 +0000231 // We have a valid insert point, reuse it if it is empty or there are no
232 // explicit jumps to the return block.
John McCallad5d61e2010-07-23 21:56:41 +0000233 if (CurBB->empty() || ReturnBlock.getBlock()->use_empty()) {
234 ReturnBlock.getBlock()->replaceAllUsesWith(CurBB);
235 delete ReturnBlock.getBlock();
Daniel Dunbarea3060a2009-07-19 08:24:34 +0000236 } else
John McCallad5d61e2010-07-23 21:56:41 +0000237 EmitBlock(ReturnBlock.getBlock());
David Blaikie66e41972015-01-14 07:38:27 +0000238 return llvm::DebugLoc();
Daniel Dunbarfd346a32009-01-26 23:27:52 +0000239 }
240
241 // Otherwise, if the return block is the target of a single direct
242 // branch then we can just put the code in that block instead. This
243 // cleans up functions which started with a unified return block.
John McCallad5d61e2010-07-23 21:56:41 +0000244 if (ReturnBlock.getBlock()->hasOneUse()) {
Mike Stump11289f42009-09-09 15:08:12 +0000245 llvm::BranchInst *BI =
Chandler Carruth4d01fff2014-03-09 03:16:50 +0000246 dyn_cast<llvm::BranchInst>(*ReturnBlock.getBlock()->user_begin());
John McCallbd309292010-07-06 01:34:17 +0000247 if (BI && BI->isUnconditional() &&
John McCallad5d61e2010-07-23 21:56:41 +0000248 BI->getSuccessor(0) == ReturnBlock.getBlock()) {
David Blaikie66e41972015-01-14 07:38:27 +0000249 // Record/return the DebugLoc of the simple 'return' expression to be used
250 // later by the actual 'ret' instruction.
251 llvm::DebugLoc Loc = BI->getDebugLoc();
Daniel Dunbarfd346a32009-01-26 23:27:52 +0000252 Builder.SetInsertPoint(BI->getParent());
253 BI->eraseFromParent();
John McCallad5d61e2010-07-23 21:56:41 +0000254 delete ReturnBlock.getBlock();
David Blaikie66e41972015-01-14 07:38:27 +0000255 return Loc;
Daniel Dunbarfd346a32009-01-26 23:27:52 +0000256 }
257 }
258
Mike Stump18bb9282009-05-16 07:57:57 +0000259 // FIXME: We are at an unreachable point, there is no reason to emit the block
260 // unless it has uses. However, we still need a place to put the debug
261 // region.end for now.
Daniel Dunbarfd346a32009-01-26 23:27:52 +0000262
John McCallad5d61e2010-07-23 21:56:41 +0000263 EmitBlock(ReturnBlock.getBlock());
David Blaikie66e41972015-01-14 07:38:27 +0000264 return llvm::DebugLoc();
John McCallbd309292010-07-06 01:34:17 +0000265}
266
267static void EmitIfUsed(CodeGenFunction &CGF, llvm::BasicBlock *BB) {
268 if (!BB) return;
269 if (!BB->use_empty())
270 return CGF.CurFn->getBasicBlockList().push_back(BB);
271 delete BB;
Daniel Dunbarfd346a32009-01-26 23:27:52 +0000272}
273
Daniel Dunbar89654ee2008-08-26 08:29:31 +0000274void CodeGenFunction::FinishFunction(SourceLocation EndLoc) {
Chris Lattnere73e4322007-07-16 21:28:45 +0000275 assert(BreakContinueStack.empty() &&
276 "mismatched push/pop in break/continue stack!");
Mike Stump11289f42009-09-09 15:08:12 +0000277
Adrian Prantl52bf3c42013-05-03 20:11:48 +0000278 bool OnlySimpleReturnStmts = NumSimpleReturnExprs > 0
Adrian Prantl524ba1f2013-07-25 00:23:42 +0000279 && NumSimpleReturnExprs == NumReturnExprs
280 && ReturnBlock.getBlock()->use_empty();
281 // Usually the return expression is evaluated before the cleanup
282 // code. If the function contains only a simple return statement,
283 // such as a constant, the location before the cleanup code becomes
284 // the last useful breakpoint in the function, because the simple
285 // return expression will be evaluated after the cleanup code. To be
286 // safe, set the debug location for cleanup code to the location of
287 // the return statement. Otherwise the cleanup code should be at the
288 // end of the function's lexical scope.
289 //
290 // If there are multiple branches to the return block, the branch
291 // instructions will get the location of the return statements and
292 // all will be fine.
Adrian Prantl3be10542013-05-02 17:30:20 +0000293 if (CGDebugInfo *DI = getDebugInfo()) {
Adrian Prantl52bf3c42013-05-03 20:11:48 +0000294 if (OnlySimpleReturnStmts)
Adrian Prantle83b1302014-01-07 22:05:52 +0000295 DI->EmitLocation(Builder, LastStopPoint);
Adrian Prantl3be10542013-05-02 17:30:20 +0000296 else
Adrian Prantle83b1302014-01-07 22:05:52 +0000297 DI->EmitLocation(Builder, EndLoc);
Adrian Prantl3be10542013-05-02 17:30:20 +0000298 }
David Blaikie357aafb2013-02-01 19:09:49 +0000299
John McCall31168b02011-06-15 23:02:42 +0000300 // Pop any cleanups that might have been associated with the
301 // parameters. Do this in whatever block we're currently in; it's
302 // important to do this before we enter the return block or return
303 // edges will be *really* confused.
David Majnemerdc012fa2015-04-22 21:38:15 +0000304 bool HasCleanups = EHStack.stable_begin() != PrologueCleanupDepth;
305 bool HasOnlyLifetimeMarkers =
306 HasCleanups && EHStack.containsOnlyLifetimeMarkers(PrologueCleanupDepth);
307 bool EmitRetDbgLoc = !HasCleanups || HasOnlyLifetimeMarkers;
308 if (HasCleanups) {
Adrian Prantl3be10542013-05-02 17:30:20 +0000309 // Make sure the line table doesn't jump back into the body for
310 // the ret after it's been at EndLoc.
Adrian Prantl3be10542013-05-02 17:30:20 +0000311 if (CGDebugInfo *DI = getDebugInfo())
Adrian Prantl52bf3c42013-05-03 20:11:48 +0000312 if (OnlySimpleReturnStmts)
Adrian Prantle83b1302014-01-07 22:05:52 +0000313 DI->EmitLocation(Builder, EndLoc);
David Blaikie4d524432015-02-04 19:47:54 +0000314
315 PopCleanupBlocks(PrologueCleanupDepth);
Adrian Prantl3be10542013-05-02 17:30:20 +0000316 }
317
Mike Stump11289f42009-09-09 15:08:12 +0000318 // Emit function epilog (to return).
David Blaikie66e41972015-01-14 07:38:27 +0000319 llvm::DebugLoc Loc = EmitReturnBlock();
Daniel Dunbarfab3f932008-11-11 20:59:54 +0000320
Daniel Dunbar468a8f82011-02-10 17:32:22 +0000321 if (ShouldInstrumentFunction())
322 EmitFunctionInstrumentation("__cyg_profile_func_exit");
Chris Lattner3c77a352010-06-22 00:03:40 +0000323
Daniel Dunbarfab3f932008-11-11 20:59:54 +0000324 // Emit debug descriptor for function end.
David Blaikie66e41972015-01-14 07:38:27 +0000325 if (CGDebugInfo *DI = getDebugInfo())
Devang Patel0884a602010-07-22 22:29:16 +0000326 DI->EmitFunctionEnd(Builder);
Daniel Dunbarfab3f932008-11-11 20:59:54 +0000327
David Blaikie66e41972015-01-14 07:38:27 +0000328 // Reset the debug location to that of the simple 'return' expression, if any
329 // rather than that of the end of the function's scope '}'.
330 ApplyDebugLocation AL(*this, Loc);
Nick Lewycky2d84e842013-10-02 02:29:49 +0000331 EmitFunctionEpilog(*CurFnInfo, EmitRetDbgLoc, EndLoc);
Mike Stump1d849212009-12-07 23:38:24 +0000332 EmitEndEHSpec(CurCodeDecl);
Daniel Dunbar54bb1932008-09-09 21:00:17 +0000333
John McCallbd309292010-07-06 01:34:17 +0000334 assert(EHStack.empty() &&
335 "did not remove all scopes from cleanup stack!");
336
Chris Lattner6c4d2552009-10-28 23:59:40 +0000337 // If someone did an indirect goto, emit the indirect goto block at the end of
338 // the function.
339 if (IndirectBranch) {
340 EmitBlock(IndirectBranch->getParent());
341 Builder.ClearInsertionPoint();
342 }
Michael Ilseman686240a2012-12-04 00:29:55 +0000343
Reid Kleckner98cb8ba2015-07-07 22:26:07 +0000344 // If some of our locals escaped, insert a call to llvm.localescape in the
Reid Kleckner31a1bb02015-04-08 22:23:48 +0000345 // entry block.
346 if (!EscapedLocals.empty()) {
347 // Invert the map from local to index into a simple vector. There should be
348 // no holes.
349 SmallVector<llvm::Value *, 4> EscapeArgs;
350 EscapeArgs.resize(EscapedLocals.size());
351 for (auto &Pair : EscapedLocals)
352 EscapeArgs[Pair.second] = Pair.first;
353 llvm::Function *FrameEscapeFn = llvm::Intrinsic::getDeclaration(
Reid Kleckner98cb8ba2015-07-07 22:26:07 +0000354 &CGM.getModule(), llvm::Intrinsic::localescape);
John McCall7f416cc2015-09-08 08:05:57 +0000355 CGBuilderTy(*this, AllocaInsertPt).CreateCall(FrameEscapeFn, EscapeArgs);
Reid Kleckner31a1bb02015-04-08 22:23:48 +0000356 }
357
Chris Lattnerc48023b2007-12-02 06:32:24 +0000358 // Remove the AllocaInsertPt instruction, which is just a convenience for us.
Chris Lattner2739d2b2009-03-31 22:17:44 +0000359 llvm::Instruction *Ptr = AllocaInsertPt;
Craig Topper8a13c412014-05-21 05:09:00 +0000360 AllocaInsertPt = nullptr;
Chris Lattner2739d2b2009-03-31 22:17:44 +0000361 Ptr->eraseFromParent();
Michael Ilseman686240a2012-12-04 00:29:55 +0000362
Chris Lattner6c4d2552009-10-28 23:59:40 +0000363 // If someone took the address of a label but never did an indirect goto, we
364 // made a zero entry PHI node, which is illegal, zap it now.
365 if (IndirectBranch) {
366 llvm::PHINode *PN = cast<llvm::PHINode>(IndirectBranch->getAddress());
367 if (PN->getNumIncomingValues() == 0) {
368 PN->replaceAllUsesWith(llvm::UndefValue::get(PN->getType()));
369 PN->eraseFromParent();
370 }
371 }
John McCallbd309292010-07-06 01:34:17 +0000372
John McCall8e4c74b2011-08-11 02:22:43 +0000373 EmitIfUsed(*this, EHResumeBlock);
John McCallbd309292010-07-06 01:34:17 +0000374 EmitIfUsed(*this, TerminateLandingPad);
375 EmitIfUsed(*this, TerminateHandler);
376 EmitIfUsed(*this, UnreachableBlock);
John McCall09ae0322010-07-06 23:57:41 +0000377
378 if (CGM.getCodeGenOpts().EmitDeclMetadata)
379 EmitDeclMetadata();
Reid Kleckner314ef7b2014-02-01 00:04:45 +0000380
381 for (SmallVectorImpl<std::pair<llvm::Instruction *, llvm::Value *> >::iterator
382 I = DeferredReplacements.begin(),
383 E = DeferredReplacements.end();
384 I != E; ++I) {
385 I->first->replaceAllUsesWith(I->second);
386 I->first->eraseFromParent();
387 }
Chris Lattnerd1af2d22007-05-29 23:17:50 +0000388}
Chris Lattner308f4312007-05-29 23:50:05 +0000389
Chris Lattner3c77a352010-06-22 00:03:40 +0000390/// ShouldInstrumentFunction - Return true if the current function should be
391/// instrumented with __cyg_profile_func_* calls
392bool CodeGenFunction::ShouldInstrumentFunction() {
393 if (!CGM.getCodeGenOpts().InstrumentFunctions)
394 return false;
Ted Kremenekc249c412011-05-16 23:49:20 +0000395 if (!CurFuncDecl || CurFuncDecl->hasAttr<NoInstrumentFunctionAttr>())
Chris Lattner3c77a352010-06-22 00:03:40 +0000396 return false;
397 return true;
398}
399
400/// EmitFunctionInstrumentation - Emit LLVM code to call the specified
401/// instrumentation function with the current function and the call site, if
402/// function instrumentation is enabled.
403void CodeGenFunction::EmitFunctionInstrumentation(const char *Fn) {
Chris Lattnerb48a2d52010-06-23 05:21:28 +0000404 // void __cyg_profile_func_{enter,exit} (void *this_fn, void *call_site);
Chris Lattnera5f58b02011-07-09 17:41:47 +0000405 llvm::PointerType *PointerTy = Int8PtrTy;
406 llvm::Type *ProfileFuncArgs[] = { PointerTy, PointerTy };
Chris Lattner2192fe52011-07-18 04:24:23 +0000407 llvm::FunctionType *FunctionTy =
Chris Lattnerece04092012-02-07 00:39:47 +0000408 llvm::FunctionType::get(VoidTy, ProfileFuncArgs, false);
Chris Lattner3c77a352010-06-22 00:03:40 +0000409
410 llvm::Constant *F = CGM.CreateRuntimeFunction(FunctionTy, Fn);
411 llvm::CallInst *CallSite = Builder.CreateCall(
Benjamin Kramer8d375ce2011-07-14 17:45:50 +0000412 CGM.getIntrinsic(llvm::Intrinsic::returnaddress),
Chris Lattner5e016ae2010-06-27 07:15:29 +0000413 llvm::ConstantInt::get(Int32Ty, 0),
Chris Lattner3c77a352010-06-22 00:03:40 +0000414 "callsite");
415
John McCall882987f2013-02-28 19:01:20 +0000416 llvm::Value *args[] = {
417 llvm::ConstantExpr::getBitCast(CurFn, PointerTy),
418 CallSite
419 };
420
421 EmitNounwindRuntimeCall(F, args);
Chris Lattner3c77a352010-06-22 00:03:40 +0000422}
423
Roman Divacky178e01602011-02-10 16:52:03 +0000424void CodeGenFunction::EmitMCountInstrumentation() {
Chris Lattnerece04092012-02-07 00:39:47 +0000425 llvm::FunctionType *FTy = llvm::FunctionType::get(VoidTy, false);
Roman Divacky178e01602011-02-10 16:52:03 +0000426
John McCallc8e01702013-04-16 22:48:15 +0000427 llvm::Constant *MCountFn =
428 CGM.CreateRuntimeFunction(FTy, getTarget().getMCountName());
John McCall882987f2013-02-28 19:01:20 +0000429 EmitNounwindRuntimeCall(MCountFn);
Roman Divacky178e01602011-02-10 16:52:03 +0000430}
431
Tanya Lattner7445ada2012-07-11 23:02:10 +0000432// OpenCL v1.2 s5.6.4.6 allows the compiler to store kernel argument
433// information in the program executable. The argument information stored
434// includes the argument name, its type, the address and access qualifiers used.
Tanya Lattner7445ada2012-07-11 23:02:10 +0000435static void GenOpenCLArgMetadata(const FunctionDecl *FD, llvm::Function *Fn,
Duncan P. N. Exon Smithfb494912014-12-09 18:39:32 +0000436 CodeGenModule &CGM, llvm::LLVMContext &Context,
437 SmallVector<llvm::Metadata *, 5> &kernelMDArgs,
438 CGBuilderTy &Builder, ASTContext &ASTCtx) {
Guy Benyeifb36ede2013-03-24 13:58:12 +0000439 // Create MDNodes that represent the kernel arg metadata.
Tanya Lattner7445ada2012-07-11 23:02:10 +0000440 // Each MDNode is a list in the form of "key", N number of values which is
441 // the same number of values as their are kernel arguments.
Michael Ilseman686240a2012-12-04 00:29:55 +0000442
Joey Gouly92a47442014-04-04 13:43:57 +0000443 const PrintingPolicy &Policy = ASTCtx.getPrintingPolicy();
444
Guy Benyeifb36ede2013-03-24 13:58:12 +0000445 // MDNode for the kernel argument address space qualifiers.
Duncan P. N. Exon Smithfb494912014-12-09 18:39:32 +0000446 SmallVector<llvm::Metadata *, 8> addressQuals;
Guy Benyeifb36ede2013-03-24 13:58:12 +0000447 addressQuals.push_back(llvm::MDString::get(Context, "kernel_arg_addr_space"));
448
449 // MDNode for the kernel argument access qualifiers (images only).
Duncan P. N. Exon Smithfb494912014-12-09 18:39:32 +0000450 SmallVector<llvm::Metadata *, 8> accessQuals;
Guy Benyeifb36ede2013-03-24 13:58:12 +0000451 accessQuals.push_back(llvm::MDString::get(Context, "kernel_arg_access_qual"));
452
453 // MDNode for the kernel argument type names.
Duncan P. N. Exon Smithfb494912014-12-09 18:39:32 +0000454 SmallVector<llvm::Metadata *, 8> argTypeNames;
Guy Benyeifb36ede2013-03-24 13:58:12 +0000455 argTypeNames.push_back(llvm::MDString::get(Context, "kernel_arg_type"));
456
Fraser Cormackdadc3712014-07-30 14:39:53 +0000457 // MDNode for the kernel argument base type names.
Duncan P. N. Exon Smithfb494912014-12-09 18:39:32 +0000458 SmallVector<llvm::Metadata *, 8> argBaseTypeNames;
Fraser Cormackdadc3712014-07-30 14:39:53 +0000459 argBaseTypeNames.push_back(
460 llvm::MDString::get(Context, "kernel_arg_base_type"));
461
Guy Benyeifb36ede2013-03-24 13:58:12 +0000462 // MDNode for the kernel argument type qualifiers.
Duncan P. N. Exon Smithfb494912014-12-09 18:39:32 +0000463 SmallVector<llvm::Metadata *, 8> argTypeQuals;
Guy Benyeifb36ede2013-03-24 13:58:12 +0000464 argTypeQuals.push_back(llvm::MDString::get(Context, "kernel_arg_type_qual"));
465
Tanya Lattner7445ada2012-07-11 23:02:10 +0000466 // MDNode for the kernel argument names.
Duncan P. N. Exon Smithfb494912014-12-09 18:39:32 +0000467 SmallVector<llvm::Metadata *, 8> argNames;
Tanya Lattner7445ada2012-07-11 23:02:10 +0000468 argNames.push_back(llvm::MDString::get(Context, "kernel_arg_name"));
Michael Ilseman686240a2012-12-04 00:29:55 +0000469
Tanya Lattner7445ada2012-07-11 23:02:10 +0000470 for (unsigned i = 0, e = FD->getNumParams(); i != e; ++i) {
471 const ParmVarDecl *parm = FD->getParamDecl(i);
Guy Benyeifb36ede2013-03-24 13:58:12 +0000472 QualType ty = parm->getType();
473 std::string typeQuals;
474
475 if (ty->isPointerType()) {
476 QualType pointeeTy = ty->getPointeeType();
477
478 // Get address qualifier.
Duncan P. N. Exon Smithfb494912014-12-09 18:39:32 +0000479 addressQuals.push_back(llvm::ConstantAsMetadata::get(Builder.getInt32(
480 ASTCtx.getTargetAddressSpace(pointeeTy.getAddressSpace()))));
Guy Benyeifb36ede2013-03-24 13:58:12 +0000481
482 // Get argument type name.
Joey Gouly92a47442014-04-04 13:43:57 +0000483 std::string typeName =
484 pointeeTy.getUnqualifiedType().getAsString(Policy) + "*";
Guy Benyeifb36ede2013-03-24 13:58:12 +0000485
486 // Turn "unsigned type" to "utype"
487 std::string::size_type pos = typeName.find("unsigned");
Fraser Cormack152493b2014-07-30 13:41:12 +0000488 if (pointeeTy.isCanonical() && pos != std::string::npos)
Benjamin Krameref89ae02013-03-24 16:04:55 +0000489 typeName.erase(pos+1, 8);
Guy Benyeifb36ede2013-03-24 13:58:12 +0000490
491 argTypeNames.push_back(llvm::MDString::get(Context, typeName));
492
Fraser Cormackdadc3712014-07-30 14:39:53 +0000493 std::string baseTypeName =
494 pointeeTy.getUnqualifiedType().getCanonicalType().getAsString(
495 Policy) +
496 "*";
497
498 // Turn "unsigned type" to "utype"
499 pos = baseTypeName.find("unsigned");
500 if (pos != std::string::npos)
501 baseTypeName.erase(pos+1, 8);
502
503 argBaseTypeNames.push_back(llvm::MDString::get(Context, baseTypeName));
504
Guy Benyeifb36ede2013-03-24 13:58:12 +0000505 // Get argument type qualifiers:
506 if (ty.isRestrictQualified())
507 typeQuals = "restrict";
508 if (pointeeTy.isConstQualified() ||
509 (pointeeTy.getAddressSpace() == LangAS::opencl_constant))
Benjamin Krameref89ae02013-03-24 16:04:55 +0000510 typeQuals += typeQuals.empty() ? "const" : " const";
Guy Benyeifb36ede2013-03-24 13:58:12 +0000511 if (pointeeTy.isVolatileQualified())
Benjamin Krameref89ae02013-03-24 16:04:55 +0000512 typeQuals += typeQuals.empty() ? "volatile" : " volatile";
Guy Benyeifb36ede2013-03-24 13:58:12 +0000513 } else {
Pekka Jaaskelainen3587b322014-01-09 13:37:30 +0000514 uint32_t AddrSpc = 0;
Xiuli Pan9c14e282016-01-09 12:53:17 +0000515 bool isPipe = ty->isPipeType();
516 if (ty->isImageType() || isPipe)
Pekka Jaaskelainen3587b322014-01-09 13:37:30 +0000517 AddrSpc =
518 CGM.getContext().getTargetAddressSpace(LangAS::opencl_global);
Bob Wilson95a27b02014-02-17 19:20:59 +0000519
Duncan P. N. Exon Smithfb494912014-12-09 18:39:32 +0000520 addressQuals.push_back(
521 llvm::ConstantAsMetadata::get(Builder.getInt32(AddrSpc)));
Guy Benyeifb36ede2013-03-24 13:58:12 +0000522
523 // Get argument type name.
Xiuli Pan9c14e282016-01-09 12:53:17 +0000524 std::string typeName;
525 if (isPipe)
526 typeName = cast<PipeType>(ty)->getElementType().getAsString(Policy);
527 else
528 typeName = ty.getUnqualifiedType().getAsString(Policy);
Guy Benyeifb36ede2013-03-24 13:58:12 +0000529
530 // Turn "unsigned type" to "utype"
531 std::string::size_type pos = typeName.find("unsigned");
Fraser Cormack152493b2014-07-30 13:41:12 +0000532 if (ty.isCanonical() && pos != std::string::npos)
Benjamin Krameref89ae02013-03-24 16:04:55 +0000533 typeName.erase(pos+1, 8);
Guy Benyeifb36ede2013-03-24 13:58:12 +0000534
535 argTypeNames.push_back(llvm::MDString::get(Context, typeName));
536
Xiuli Pan9c14e282016-01-09 12:53:17 +0000537 std::string baseTypeName;
538 if (isPipe)
539 baseTypeName =
540 cast<PipeType>(ty)->getElementType().getCanonicalType().getAsString(Policy);
541 else
542 baseTypeName =
Fraser Cormackdadc3712014-07-30 14:39:53 +0000543 ty.getUnqualifiedType().getCanonicalType().getAsString(Policy);
544
545 // Turn "unsigned type" to "utype"
546 pos = baseTypeName.find("unsigned");
547 if (pos != std::string::npos)
548 baseTypeName.erase(pos+1, 8);
549
550 argBaseTypeNames.push_back(llvm::MDString::get(Context, baseTypeName));
551
Guy Benyeifb36ede2013-03-24 13:58:12 +0000552 // Get argument type qualifiers:
553 if (ty.isConstQualified())
554 typeQuals = "const";
555 if (ty.isVolatileQualified())
Benjamin Krameref89ae02013-03-24 16:04:55 +0000556 typeQuals += typeQuals.empty() ? "volatile" : " volatile";
Xiuli Pan9c14e282016-01-09 12:53:17 +0000557 if (isPipe)
558 typeQuals = "pipe";
Guy Benyeifb36ede2013-03-24 13:58:12 +0000559 }
Justin Bogner0f066062013-11-22 10:20:40 +0000560
Guy Benyeifb36ede2013-03-24 13:58:12 +0000561 argTypeQuals.push_back(llvm::MDString::get(Context, typeQuals));
562
Xiuli Pan9c14e282016-01-09 12:53:17 +0000563 // Get image and pipe access qualifier:
564 // FIXME: now image and pipe share the same access qualifier maybe we can
565 // refine it to OpenCL access qualifier and also handle write_read
566 if (ty->isImageType()|| ty->isPipeType()) {
Aaron Ballmanc4327992013-12-19 03:09:10 +0000567 const OpenCLImageAccessAttr *A = parm->getAttr<OpenCLImageAccessAttr>();
Aaron Ballman26891332014-01-14 17:41:53 +0000568 if (A && A->isWriteOnly())
Guy Benyeifb36ede2013-03-24 13:58:12 +0000569 accessQuals.push_back(llvm::MDString::get(Context, "write_only"));
570 else
571 accessQuals.push_back(llvm::MDString::get(Context, "read_only"));
Aaron Ballman26891332014-01-14 17:41:53 +0000572 // FIXME: what about read_write?
Guy Benyeifb36ede2013-03-24 13:58:12 +0000573 } else
574 accessQuals.push_back(llvm::MDString::get(Context, "none"));
Michael Ilseman686240a2012-12-04 00:29:55 +0000575
Tanya Lattner7445ada2012-07-11 23:02:10 +0000576 // Get argument name.
577 argNames.push_back(llvm::MDString::get(Context, parm->getName()));
Tanya Lattner7445ada2012-07-11 23:02:10 +0000578 }
Guy Benyeifb36ede2013-03-24 13:58:12 +0000579
580 kernelMDArgs.push_back(llvm::MDNode::get(Context, addressQuals));
581 kernelMDArgs.push_back(llvm::MDNode::get(Context, accessQuals));
582 kernelMDArgs.push_back(llvm::MDNode::get(Context, argTypeNames));
Fraser Cormackdadc3712014-07-30 14:39:53 +0000583 kernelMDArgs.push_back(llvm::MDNode::get(Context, argBaseTypeNames));
Guy Benyeifb36ede2013-03-24 13:58:12 +0000584 kernelMDArgs.push_back(llvm::MDNode::get(Context, argTypeQuals));
Sameer Sahasrabuddhec6093fe2014-12-04 05:30:58 +0000585 if (CGM.getCodeGenOpts().EmitOpenCLArgMetadata)
586 kernelMDArgs.push_back(llvm::MDNode::get(Context, argNames));
Tanya Lattner7445ada2012-07-11 23:02:10 +0000587}
588
Michael Ilseman686240a2012-12-04 00:29:55 +0000589void CodeGenFunction::EmitOpenCLKernelMetadata(const FunctionDecl *FD,
Tanya Lattnerbcffcdf2012-07-09 22:06:01 +0000590 llvm::Function *Fn)
591{
592 if (!FD->hasAttr<OpenCLKernelAttr>())
593 return;
594
595 llvm::LLVMContext &Context = getLLVMContext();
596
Duncan P. N. Exon Smithfb494912014-12-09 18:39:32 +0000597 SmallVector<llvm::Metadata *, 5> kernelMDArgs;
598 kernelMDArgs.push_back(llvm::ConstantAsMetadata::get(Fn));
Tanya Lattnerbcffcdf2012-07-09 22:06:01 +0000599
Sameer Sahasrabuddhec6093fe2014-12-04 05:30:58 +0000600 GenOpenCLArgMetadata(FD, Fn, CGM, Context, kernelMDArgs, Builder,
601 getContext());
Michael Ilseman686240a2012-12-04 00:29:55 +0000602
Aaron Ballmanc4327992013-12-19 03:09:10 +0000603 if (const VecTypeHintAttr *A = FD->getAttr<VecTypeHintAttr>()) {
604 QualType hintQTy = A->getTypeHint();
Joey Goulyaba589c2013-03-08 09:42:32 +0000605 const ExtVectorType *hintEltQTy = hintQTy->getAs<ExtVectorType>();
606 bool isSignedInteger =
607 hintQTy->isSignedIntegerType() ||
608 (hintEltQTy && hintEltQTy->getElementType()->isSignedIntegerType());
Duncan P. N. Exon Smithfb494912014-12-09 18:39:32 +0000609 llvm::Metadata *attrMDArgs[] = {
610 llvm::MDString::get(Context, "vec_type_hint"),
611 llvm::ConstantAsMetadata::get(llvm::UndefValue::get(
612 CGM.getTypes().ConvertType(A->getTypeHint()))),
613 llvm::ConstantAsMetadata::get(llvm::ConstantInt::get(
614 llvm::IntegerType::get(Context, 32),
615 llvm::APInt(32, (uint64_t)(isSignedInteger ? 1 : 0))))};
Joey Goulyaba589c2013-03-08 09:42:32 +0000616 kernelMDArgs.push_back(llvm::MDNode::get(Context, attrMDArgs));
617 }
618
Aaron Ballmanc4327992013-12-19 03:09:10 +0000619 if (const WorkGroupSizeHintAttr *A = FD->getAttr<WorkGroupSizeHintAttr>()) {
Duncan P. N. Exon Smithfb494912014-12-09 18:39:32 +0000620 llvm::Metadata *attrMDArgs[] = {
621 llvm::MDString::get(Context, "work_group_size_hint"),
622 llvm::ConstantAsMetadata::get(Builder.getInt32(A->getXDim())),
623 llvm::ConstantAsMetadata::get(Builder.getInt32(A->getYDim())),
624 llvm::ConstantAsMetadata::get(Builder.getInt32(A->getZDim()))};
Tanya Lattnerbcffcdf2012-07-09 22:06:01 +0000625 kernelMDArgs.push_back(llvm::MDNode::get(Context, attrMDArgs));
626 }
627
Aaron Ballmanc4327992013-12-19 03:09:10 +0000628 if (const ReqdWorkGroupSizeAttr *A = FD->getAttr<ReqdWorkGroupSizeAttr>()) {
Duncan P. N. Exon Smithfb494912014-12-09 18:39:32 +0000629 llvm::Metadata *attrMDArgs[] = {
630 llvm::MDString::get(Context, "reqd_work_group_size"),
631 llvm::ConstantAsMetadata::get(Builder.getInt32(A->getXDim())),
632 llvm::ConstantAsMetadata::get(Builder.getInt32(A->getYDim())),
633 llvm::ConstantAsMetadata::get(Builder.getInt32(A->getZDim()))};
Tanya Lattnerbcffcdf2012-07-09 22:06:01 +0000634 kernelMDArgs.push_back(llvm::MDNode::get(Context, attrMDArgs));
635 }
636
637 llvm::MDNode *kernelMDNode = llvm::MDNode::get(Context, kernelMDArgs);
638 llvm::NamedMDNode *OpenCLKernelMetadata =
639 CGM.getModule().getOrInsertNamedMetadata("opencl.kernels");
640 OpenCLKernelMetadata->addOperand(kernelMDNode);
641}
642
Adrian Prantl2cede0f2014-04-29 01:07:59 +0000643/// Determine whether the function F ends with a return stmt.
644static bool endsWithReturn(const Decl* F) {
645 const Stmt *Body = nullptr;
646 if (auto *FD = dyn_cast_or_null<FunctionDecl>(F))
647 Body = FD->getBody();
648 else if (auto *OMD = dyn_cast_or_null<ObjCMethodDecl>(F))
649 Body = OMD->getBody();
650
651 if (auto *CS = dyn_cast_or_null<CompoundStmt>(Body)) {
652 auto LastStmt = CS->body_rbegin();
653 if (LastStmt != CS->body_rend())
654 return isa<ReturnStmt>(*LastStmt);
655 }
656 return false;
657}
658
John McCalldec348f72013-05-03 07:33:41 +0000659void CodeGenFunction::StartFunction(GlobalDecl GD,
660 QualType RetTy,
Daniel Dunbarbc915f42008-09-09 23:14:03 +0000661 llvm::Function *Fn,
John McCalla738c252011-03-09 04:27:21 +0000662 const CGFunctionInfo &FnInfo,
Daniel Dunbar354d2782008-10-18 18:22:23 +0000663 const FunctionArgList &Args,
Adrian Prantl42d71b92014-04-10 23:21:53 +0000664 SourceLocation Loc,
Tilmann Scheller99cc30c2011-03-02 21:36:49 +0000665 SourceLocation StartLoc) {
David Blaikie8e6c36e2014-10-14 16:43:46 +0000666 assert(!CurFn &&
667 "Do not use a CodeGenFunction object for more than one function");
668
Anders Carlsson73fcc952009-09-11 00:07:24 +0000669 const Decl *D = GD.getDecl();
Michael Ilseman686240a2012-12-04 00:29:55 +0000670
Anders Carlssonf4478e92009-02-09 20:20:56 +0000671 DidCallStackSave = false;
John McCalldec348f72013-05-03 07:33:41 +0000672 CurCodeDecl = D;
Craig Topper8a13c412014-05-21 05:09:00 +0000673 CurFuncDecl = (D ? D->getNonClosureContext() : nullptr);
Daniel Dunbarbc915f42008-09-09 23:14:03 +0000674 FnRetTy = RetTy;
Daniel Dunbar9c426522008-07-29 23:18:29 +0000675 CurFn = Fn;
John McCalla738c252011-03-09 04:27:21 +0000676 CurFnInfo = &FnInfo;
Chris Lattner5696e7b2008-06-17 18:05:57 +0000677 assert(CurFn->isDeclaration() && "Function already has body?");
678
Alexey Samsonov1444bb92014-10-17 00:20:19 +0000679 if (CGM.isInSanitizerBlacklist(Fn, Loc))
Alexey Samsonov035462c2014-10-30 19:33:44 +0000680 SanOpts.clear();
Will Dietzf54319c2013-01-18 11:30:38 +0000681
Peter Collingbourne915df992015-05-15 18:33:32 +0000682 if (D) {
683 // Apply the no_sanitize* attributes to SanOpts.
684 for (auto Attr : D->specific_attrs<NoSanitizeAttr>())
685 SanOpts.Mask &= ~Attr->getMask();
686 }
687
688 // Apply sanitizer attributes to the function.
Alexander Potapenkob9b73ef2015-06-19 12:19:07 +0000689 if (SanOpts.hasOneOf(SanitizerKind::Address | SanitizerKind::KernelAddress))
Peter Collingbourne915df992015-05-15 18:33:32 +0000690 Fn->addFnAttr(llvm::Attribute::SanitizeAddress);
691 if (SanOpts.has(SanitizerKind::Thread))
692 Fn->addFnAttr(llvm::Attribute::SanitizeThread);
693 if (SanOpts.has(SanitizerKind::Memory))
694 Fn->addFnAttr(llvm::Attribute::SanitizeMemory);
Peter Collingbournec4122c12015-06-15 21:08:13 +0000695 if (SanOpts.has(SanitizerKind::SafeStack))
696 Fn->addFnAttr(llvm::Attribute::SafeStack);
Peter Collingbourne915df992015-05-15 18:33:32 +0000697
Jakob Stoklund Olesen819e54b2010-02-09 00:10:00 +0000698 // Pass inline keyword to optimizer if it appears explicitly on any
Roman Divackydd9bfb22014-01-15 19:07:16 +0000699 // declaration. Also, in the case of -fno-inline attach NoInline
David Majnemer19d7d542014-02-25 10:51:14 +0000700 // attribute to all function that are not marked AlwaysInline.
Roman Divackydd9bfb22014-01-15 19:07:16 +0000701 if (const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(D)) {
702 if (!CGM.getCodeGenOpts().NoInline) {
Aaron Ballman86c93902014-03-06 23:45:36 +0000703 for (auto RI : FD->redecls())
Chad Rosier883b2572012-03-14 23:32:11 +0000704 if (RI->isInlineSpecified()) {
Bill Wendling207f0532012-12-20 19:27:06 +0000705 Fn->addFnAttr(llvm::Attribute::InlineHint);
Chad Rosier883b2572012-03-14 23:32:11 +0000706 break;
707 }
David Majnemer67e541e1c2014-02-25 09:53:29 +0000708 } else if (!FD->hasAttr<AlwaysInlineAttr>())
Roman Divackydd9bfb22014-01-15 19:07:16 +0000709 Fn->addFnAttr(llvm::Attribute::NoInline);
710 }
Jakob Stoklund Olesen819e54b2010-02-09 00:10:00 +0000711
Richard Smith9c6890a2012-11-01 22:30:59 +0000712 if (getLangOpts().OpenCL) {
Peter Collingbourne7ce13fc2011-02-14 01:42:53 +0000713 // Add metadata for a kernel function.
714 if (const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(D))
Tanya Lattnerbcffcdf2012-07-09 22:06:01 +0000715 EmitOpenCLKernelMetadata(FD, Fn);
Peter Collingbourne7ce13fc2011-02-14 01:42:53 +0000716 }
717
Peter Collingbourneb453cd62013-10-20 21:29:19 +0000718 // If we are checking function types, emit a function type signature as
Peter Collingbourne1a0a9a32014-12-03 02:08:51 +0000719 // prologue data.
Alexey Samsonovedf99a92014-11-07 22:29:38 +0000720 if (getLangOpts().CPlusPlus && SanOpts.has(SanitizerKind::Function)) {
Peter Collingbourneb453cd62013-10-20 21:29:19 +0000721 if (const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(D)) {
Peter Collingbourne1a0a9a32014-12-03 02:08:51 +0000722 if (llvm::Constant *PrologueSig =
Peter Collingbourneb453cd62013-10-20 21:29:19 +0000723 CGM.getTargetCodeGenInfo().getUBSanFunctionSignature(CGM)) {
724 llvm::Constant *FTRTTIConst =
725 CGM.GetAddrOfRTTIDescriptor(FD->getType(), /*ForEH=*/true);
Peter Collingbourne1a0a9a32014-12-03 02:08:51 +0000726 llvm::Constant *PrologueStructElems[] = { PrologueSig, FTRTTIConst };
727 llvm::Constant *PrologueStructConst =
728 llvm::ConstantStruct::getAnon(PrologueStructElems, /*Packed=*/true);
729 Fn->setPrologueData(PrologueStructConst);
Peter Collingbourneb453cd62013-10-20 21:29:19 +0000730 }
731 }
732 }
733
James Molloyc16a60b62015-11-12 15:36:04 +0000734 // If we're in C++ mode and the function name is "main", it is guaranteed
735 // to be norecurse by the standard (3.6.1.3 "The function main shall not be
736 // used within a program").
737 if (getLangOpts().CPlusPlus)
738 if (const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(D))
739 if (FD->isMain())
740 Fn->addFnAttr(llvm::Attribute::NoRecurse);
741
Daniel Dunbar75283ff2008-11-11 02:29:29 +0000742 llvm::BasicBlock *EntryBB = createBasicBlock("entry", CurFn);
Daniel Dunbar54bb1932008-09-09 21:00:17 +0000743
Chris Lattner5696e7b2008-06-17 18:05:57 +0000744 // Create a marker to make it easy to insert allocas into the entryblock
745 // later. Don't create this with the builder, because we don't want it
746 // folded.
Chris Lattner5e016ae2010-06-27 07:15:29 +0000747 llvm::Value *Undef = llvm::UndefValue::get(Int32Ty);
748 AllocaInsertPt = new llvm::BitCastInst(Undef, Int32Ty, "", EntryBB);
Chris Lattner47640222009-03-22 00:24:14 +0000749 if (Builder.isNamePreserving())
750 AllocaInsertPt->setName("allocapt");
Mike Stump11289f42009-09-09 15:08:12 +0000751
John McCallbd309292010-07-06 01:34:17 +0000752 ReturnBlock = getJumpDestInCurrentScope("return");
Mike Stump11289f42009-09-09 15:08:12 +0000753
Chris Lattner5696e7b2008-06-17 18:05:57 +0000754 Builder.SetInsertPoint(EntryBB);
Mike Stump11289f42009-09-09 15:08:12 +0000755
Sanjiv Gupta1e8b6082008-07-04 11:04:26 +0000756 // Emit subprogram debug descriptor.
Anders Carlsson63784f42009-02-13 08:11:52 +0000757 if (CGDebugInfo *DI = getDebugInfo()) {
Jordan Rose5c382722013-03-08 21:51:21 +0000758 SmallVector<QualType, 16> ArgTypes;
Eric Christopher4b4beb22011-10-21 23:30:10 +0000759 for (FunctionArgList::const_iterator i = Args.begin(), e = Args.end();
760 i != e; ++i) {
Jordan Rose5c382722013-03-08 21:51:21 +0000761 ArgTypes.push_back((*i)->getType());
Eric Christopher4b4beb22011-10-21 23:30:10 +0000762 }
763
John McCalldb40c7f2010-12-14 08:05:40 +0000764 QualType FnType =
Jordan Rose5c382722013-03-08 21:51:21 +0000765 getContext().getFunctionType(RetTy, ArgTypes,
John McCalldb40c7f2010-12-14 08:05:40 +0000766 FunctionProtoType::ExtProtoInfo());
Adrian Prantl42d71b92014-04-10 23:21:53 +0000767 DI->EmitFunctionStart(GD, Loc, StartLoc, FnType, CurFn, Builder);
Sanjiv Gupta1e8b6082008-07-04 11:04:26 +0000768 }
769
Daniel Dunbar468a8f82011-02-10 17:32:22 +0000770 if (ShouldInstrumentFunction())
771 EmitFunctionInstrumentation("__cyg_profile_func_enter");
Chris Lattner3c77a352010-06-22 00:03:40 +0000772
Roman Divacky178e01602011-02-10 16:52:03 +0000773 if (CGM.getCodeGenOpts().InstrumentForProfiling)
774 EmitMCountInstrumentation();
775
Eli Friedman4b1942c2009-12-04 02:43:40 +0000776 if (RetTy->isVoidType()) {
777 // Void type; nothing to return.
John McCall7f416cc2015-09-08 08:05:57 +0000778 ReturnValue = Address::invalid();
Adrian Prantl2cede0f2014-04-29 01:07:59 +0000779
780 // Count the implicit return.
781 if (!endsWithReturn(D))
782 ++NumReturnExprs;
Eli Friedman4b1942c2009-12-04 02:43:40 +0000783 } else if (CurFnInfo->getReturnInfo().getKind() == ABIArgInfo::Indirect &&
John McCall47fb9502013-03-07 21:37:08 +0000784 !hasScalarEvaluationKind(CurFnInfo->getReturnType())) {
Eli Friedman4b1942c2009-12-04 02:43:40 +0000785 // Indirect aggregate return; emit returned value directly into sret slot.
Daniel Dunbarfd09df72010-02-16 19:45:20 +0000786 // This reduces code size, and affects correctness in C++.
Reid Kleckner37abaca2014-05-09 22:46:15 +0000787 auto AI = CurFn->arg_begin();
788 if (CurFnInfo->getReturnInfo().isSRetAfterThis())
789 ++AI;
Duncan P. N. Exon Smith9f5260a2015-11-06 23:00:41 +0000790 ReturnValue = Address(&*AI, CurFnInfo->getReturnInfo().getIndirectAlign());
Reid Kleckner314ef7b2014-02-01 00:04:45 +0000791 } else if (CurFnInfo->getReturnInfo().getKind() == ABIArgInfo::InAlloca &&
792 !hasScalarEvaluationKind(CurFnInfo->getReturnType())) {
793 // Load the sret pointer from the argument struct and return into that.
794 unsigned Idx = CurFnInfo->getReturnInfo().getInAllocaFieldIndex();
795 llvm::Function::arg_iterator EI = CurFn->arg_end();
796 --EI;
Duncan P. N. Exon Smith9f5260a2015-11-06 23:00:41 +0000797 llvm::Value *Addr = Builder.CreateStructGEP(nullptr, &*EI, Idx);
John McCall7f416cc2015-09-08 08:05:57 +0000798 Addr = Builder.CreateAlignedLoad(Addr, getPointerAlign(), "agg.result");
799 ReturnValue = Address(Addr, getNaturalTypeAlignment(RetTy));
Eli Friedman4b1942c2009-12-04 02:43:40 +0000800 } else {
Daniel Dunbarfd09df72010-02-16 19:45:20 +0000801 ReturnValue = CreateIRTemp(RetTy, "retval");
John McCall31168b02011-06-15 23:02:42 +0000802
803 // Tell the epilog emitter to autorelease the result. We do this
804 // now so that various specialized functions can suppress it
805 // during their IR-generation.
David Blaikiebbafb8a2012-03-11 07:00:24 +0000806 if (getLangOpts().ObjCAutoRefCount &&
John McCall31168b02011-06-15 23:02:42 +0000807 !CurFnInfo->isReturnsRetained() &&
808 RetTy->isObjCRetainableType())
809 AutoreleaseResult = true;
Eli Friedman4b1942c2009-12-04 02:43:40 +0000810 }
811
Mike Stump1d849212009-12-07 23:38:24 +0000812 EmitStartEHSpec(CurCodeDecl);
John McCall31168b02011-06-15 23:02:42 +0000813
814 PrologueCleanupDepth = EHStack.stable_begin();
Daniel Dunbard931a872009-02-02 22:03:45 +0000815 EmitFunctionProlog(*CurFnInfo, CurFn, Args);
Mike Stump11289f42009-09-09 15:08:12 +0000816
Eli Friedman9fbeba02012-02-11 02:57:39 +0000817 if (D && isa<CXXMethodDecl>(D) && cast<CXXMethodDecl>(D)->isInstance()) {
John McCall5d865c322010-08-31 07:33:07 +0000818 CGM.getCXXABI().EmitInstanceFunctionProlog(*this);
Eli Friedman9fbeba02012-02-11 02:57:39 +0000819 const CXXMethodDecl *MD = cast<CXXMethodDecl>(D);
820 if (MD->getParent()->isLambda() &&
821 MD->getOverloadedOperator() == OO_Call) {
822 // We're in a lambda; figure out the captures.
823 MD->getParent()->getCaptureFields(LambdaCaptureFields,
824 LambdaThisCaptureField);
825 if (LambdaThisCaptureField) {
826 // If this lambda captures this, load it.
John McCalldec348f72013-05-03 07:33:41 +0000827 LValue ThisLValue = EmitLValueForLambdaField(LambdaThisCaptureField);
Nick Lewycky2d84e842013-10-02 02:29:49 +0000828 CXXThisValue = EmitLoadOfLValue(ThisLValue,
829 SourceLocation()).getScalarVal();
Eli Friedman9fbeba02012-02-11 02:57:39 +0000830 }
Alexey Bataev39c81e22014-08-28 04:28:19 +0000831 for (auto *FD : MD->getParent()->fields()) {
832 if (FD->hasCapturedVLAType()) {
833 auto *ExprArg = EmitLoadOfLValue(EmitLValueForLambdaField(FD),
834 SourceLocation()).getScalarVal();
835 auto VAT = FD->getCapturedVLAType();
836 VLASizeMap[VAT->getSizeExpr()] = ExprArg;
837 }
838 }
Eli Friedman9fbeba02012-02-11 02:57:39 +0000839 } else {
840 // Not in a lambda; just use 'this' from the method.
841 // FIXME: Should we generate a new load for each use of 'this'? The
842 // fast register allocator would be happier...
843 CXXThisValue = CXXABIThisValue;
844 }
845 }
John McCall347132b2010-02-16 22:04:33 +0000846
Anders Carlssonc20879a2008-12-20 21:28:43 +0000847 // If any of the arguments have a variably modified type, make sure to
848 // emit the type size.
849 for (FunctionArgList::const_iterator i = Args.begin(), e = Args.end();
850 i != e; ++i) {
Eli Friedman1f576832012-11-14 22:09:59 +0000851 const VarDecl *VD = *i;
852
853 // Dig out the type as written from ParmVarDecls; it's unclear whether
854 // the standard (C99 6.9.1p10) requires this, but we're following the
855 // precedent set by gcc.
856 QualType Ty;
857 if (const ParmVarDecl *PVD = dyn_cast<ParmVarDecl>(VD))
858 Ty = PVD->getOriginalType();
859 else
860 Ty = VD->getType();
Anders Carlssonc20879a2008-12-20 21:28:43 +0000861
862 if (Ty->isVariablyModifiedType())
John McCall23c29fe2011-06-24 21:55:10 +0000863 EmitVariablyModifiedType(Ty);
Anders Carlssonc20879a2008-12-20 21:28:43 +0000864 }
Eric Christopher7cdf9482011-10-13 21:45:18 +0000865 // Emit a location at the end of the prologue.
866 if (CGDebugInfo *DI = getDebugInfo())
867 DI->EmitLocation(Builder, StartLoc);
Daniel Dunbarbc915f42008-09-09 23:14:03 +0000868}
Eli Friedman3d421e12008-08-25 21:31:01 +0000869
Richard Smithb47c36f2013-11-05 09:12:18 +0000870void CodeGenFunction::EmitFunctionBody(FunctionArgList &Args,
871 const Stmt *Body) {
Justin Bogner66242d62015-04-23 23:06:47 +0000872 incrementProfileCounter(Body);
Richard Smithb47c36f2013-11-05 09:12:18 +0000873 if (const CompoundStmt *S = dyn_cast<CompoundStmt>(Body))
David Blaikie0a21d0d2013-01-26 22:16:26 +0000874 EmitCompoundStmtWithoutScope(*S);
875 else
Richard Smithb47c36f2013-11-05 09:12:18 +0000876 EmitStmt(Body);
John McCall89b12b32010-02-18 03:17:58 +0000877}
878
Bob Wilsonbf854f02014-02-17 19:21:09 +0000879/// When instrumenting to collect profile data, the counts for some blocks
880/// such as switch cases need to not include the fall-through counts, so
881/// emit a branch around the instrumentation code. When not instrumenting,
882/// this just calls EmitBlock().
883void CodeGenFunction::EmitBlockWithFallThrough(llvm::BasicBlock *BB,
Justin Bogner66242d62015-04-23 23:06:47 +0000884 const Stmt *S) {
Craig Topper8a13c412014-05-21 05:09:00 +0000885 llvm::BasicBlock *SkipCountBB = nullptr;
Bob Wilsonbf854f02014-02-17 19:21:09 +0000886 if (HaveInsertPoint() && CGM.getCodeGenOpts().ProfileInstrGenerate) {
887 // When instrumenting for profiling, the fallthrough to certain
888 // statements needs to skip over the instrumentation code so that we
889 // get an accurate count.
890 SkipCountBB = createBasicBlock("skipcount");
891 EmitBranch(SkipCountBB);
892 }
893 EmitBlock(BB);
Justin Bogner66242d62015-04-23 23:06:47 +0000894 uint64_t CurrentCount = getCurrentProfileCount();
895 incrementProfileCounter(S);
896 setCurrentProfileCount(getCurrentProfileCount() + CurrentCount);
Bob Wilsonbf854f02014-02-17 19:21:09 +0000897 if (SkipCountBB)
898 EmitBlock(SkipCountBB);
899}
900
John McCall8601a752010-08-03 22:46:07 +0000901/// Tries to mark the given function nounwind based on the
902/// non-existence of any throwing calls within it. We believe this is
903/// lightweight enough to do at -O0.
904static void TryMarkNoThrow(llvm::Function *F) {
John McCall59966992010-08-11 22:38:33 +0000905 // LLVM treats 'nounwind' on a function as part of the type, so we
906 // can't do this on functions that can be overwritten.
907 if (F->mayBeOverridden()) return;
908
David Majnemerdbf10452015-07-31 17:58:45 +0000909 for (llvm::BasicBlock &BB : *F)
910 for (llvm::Instruction &I : BB)
911 if (I.mayThrow())
Bill Wendlingf0724e82011-09-19 20:31:14 +0000912 return;
David Majnemerdbf10452015-07-31 17:58:45 +0000913
Bill Wendling73e465e2012-10-10 03:13:20 +0000914 F->setDoesNotThrow();
John McCall8601a752010-08-03 22:46:07 +0000915}
916
John McCalla738c252011-03-09 04:27:21 +0000917void CodeGenFunction::GenerateCode(GlobalDecl GD, llvm::Function *Fn,
918 const CGFunctionInfo &FnInfo) {
Anders Carlsson73fcc952009-09-11 00:07:24 +0000919 const FunctionDecl *FD = cast<FunctionDecl>(GD.getDecl());
Michael Ilseman686240a2012-12-04 00:29:55 +0000920
Anders Carlsson63784f42009-02-13 08:11:52 +0000921 // Check if we should generate debug info for this function.
David Blaikie92848de2013-08-26 20:33:21 +0000922 if (FD->hasAttr<NoDebugAttr>())
Craig Topper8a13c412014-05-21 05:09:00 +0000923 DebugInfo = nullptr; // disable debug info indefinitely for this function
Mike Stump11289f42009-09-09 15:08:12 +0000924
Daniel Dunbarbc915f42008-09-09 23:14:03 +0000925 FunctionArgList Args;
Alp Toker314cc812014-01-25 16:55:45 +0000926 QualType ResTy = FD->getReturnType();
Mike Stump11289f42009-09-09 15:08:12 +0000927
Mike Stumpbee78dd2009-12-04 23:26:17 +0000928 CurGD = GD;
Reid Kleckner89077a12013-12-17 19:46:40 +0000929 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD);
930 if (MD && MD->isInstance()) {
Stephen Lin9dc6eef2013-06-30 20:40:16 +0000931 if (CGM.getCXXABI().HasThisReturn(GD))
932 ResTy = MD->getThisType(getContext());
David Majnemer0c0b6d92014-10-31 20:09:12 +0000933 else if (CGM.getCXXABI().hasMostDerivedReturn(GD))
934 ResTy = CGM.getContext().VoidPtrTy;
Reid Kleckner89077a12013-12-17 19:46:40 +0000935 CGM.getCXXABI().buildThisParam(*this, Args);
Stephen Lin9dc6eef2013-06-30 20:40:16 +0000936 }
Justin Bogner66242d62015-04-23 23:06:47 +0000937
George Burgess IV3e3bb95b2015-12-02 21:58:08 +0000938 for (auto *Param : FD->params()) {
939 Args.push_back(Param);
940 if (!Param->hasAttr<PassObjectSizeAttr>())
941 continue;
942
943 IdentifierInfo *NoID = nullptr;
944 auto *Implicit = ImplicitParamDecl::Create(
945 getContext(), Param->getDeclContext(), Param->getLocation(), NoID,
946 getContext().getSizeType());
947 SizeArguments[Param] = Implicit;
948 Args.push_back(Implicit);
949 }
Daniel Dunbar89654ee2008-08-26 08:29:31 +0000950
Reid Kleckner89077a12013-12-17 19:46:40 +0000951 if (MD && (isa<CXXConstructorDecl>(MD) || isa<CXXDestructorDecl>(MD)))
952 CGM.getCXXABI().addImplicitStructorParams(*this, ResTy, Args);
953
John McCall89b12b32010-02-18 03:17:58 +0000954 SourceRange BodyRange;
955 if (Stmt *Body = FD->getBody()) BodyRange = Body->getSourceRange();
Adrian Prantldc237b52013-05-16 00:41:26 +0000956 CurEHLocation = BodyRange.getEnd();
Anders Carlsson438cf922009-11-06 02:55:43 +0000957
Adrian Prantl42d71b92014-04-10 23:21:53 +0000958 // Use the location of the start of the function to determine where
959 // the function definition is located. By default use the location
960 // of the declaration as the location for the subprogram. A function
961 // may lack a declaration in the source code if it is created by code
962 // gen. (examples: _GLOBAL__I_a, __cxx_global_array_dtor, thunk).
Alexey Samsonovcb1ad6f2014-07-08 20:23:18 +0000963 SourceLocation Loc = FD->getLocation();
Adrian Prantl42d71b92014-04-10 23:21:53 +0000964
Alexey Samsonovcb1ad6f2014-07-08 20:23:18 +0000965 // If this is a function specialization then use the pattern body
966 // as the location for the function.
967 if (const FunctionDecl *SpecDecl = FD->getTemplateInstantiationPattern())
968 if (SpecDecl->hasBody(SpecDecl))
969 Loc = SpecDecl->getLocation();
Adrian Prantl42d71b92014-04-10 23:21:53 +0000970
John McCall89b12b32010-02-18 03:17:58 +0000971 // Emit the standard function prologue.
Adrian Prantl42d71b92014-04-10 23:21:53 +0000972 StartFunction(GD, ResTy, Fn, FnInfo, Args, Loc, BodyRange.getBegin());
Anders Carlsson438cf922009-11-06 02:55:43 +0000973
John McCall89b12b32010-02-18 03:17:58 +0000974 // Generate the body of the function.
Serge Pavlov3a561452015-12-06 14:32:39 +0000975 PGO.assignRegionCounters(GD, CurFn);
John McCallb81884d2010-02-19 09:25:03 +0000976 if (isa<CXXDestructorDecl>(FD))
977 EmitDestructorBody(Args);
978 else if (isa<CXXConstructorDecl>(FD))
979 EmitConstructorBody(Args);
Richard Smith9c6890a2012-11-01 22:30:59 +0000980 else if (getLangOpts().CUDA &&
Artem Belevichf3d3db62015-03-19 18:58:18 +0000981 !getLangOpts().CUDAIsDevice &&
Peter Collingbournefa4d6032011-10-06 18:51:56 +0000982 FD->hasAttr<CUDAGlobalAttr>())
Artem Belevich52cc4872015-05-07 19:34:16 +0000983 CGM.getCUDARuntime().emitDeviceStub(*this, Args);
Eli Friedman5a6d5072012-02-16 01:37:33 +0000984 else if (isa<CXXConversionDecl>(FD) &&
Douglas Gregor355efbb2012-02-17 03:02:34 +0000985 cast<CXXConversionDecl>(FD)->isLambdaToBlockPointerConversion()) {
986 // The lambda conversion to block pointer is special; the semantics can't be
987 // expressed in the AST, so IRGen needs to special-case it.
988 EmitLambdaToBlockPointerBody(Args);
989 } else if (isa<CXXMethodDecl>(FD) &&
990 cast<CXXMethodDecl>(FD)->isLambdaStaticInvoker()) {
Faisal Vali2b391ab2013-09-26 19:54:12 +0000991 // The lambda static invoker function is special, because it forwards or
Douglas Gregor355efbb2012-02-17 03:02:34 +0000992 // clones the body of the function call operator (but is actually static).
993 EmitLambdaStaticInvokeFunction(cast<CXXMethodDecl>(FD));
Lang Hamesbf122742013-02-17 07:22:09 +0000994 } else if (FD->isDefaulted() && isa<CXXMethodDecl>(FD) &&
Nick Lewyckyb39be1f2013-09-10 05:14:39 +0000995 (cast<CXXMethodDecl>(FD)->isCopyAssignmentOperator() ||
996 cast<CXXMethodDecl>(FD)->isMoveAssignmentOperator())) {
Lang Hamesbf122742013-02-17 07:22:09 +0000997 // Implicit copy-assignment gets the same special treatment as implicit
998 // copy-constructors.
999 emitImplicitAssignmentOperatorBody(Args);
Richard Smithb47c36f2013-11-05 09:12:18 +00001000 } else if (Stmt *Body = FD->getBody()) {
1001 EmitFunctionBody(Args, Body);
Richard Smithb47c36f2013-11-05 09:12:18 +00001002 } else
1003 llvm_unreachable("no definition for emitted function");
Anders Carlssonff8cce42010-02-07 19:45:40 +00001004
Richard Smith9f9e5822012-10-04 23:52:29 +00001005 // C++11 [stmt.return]p2:
1006 // Flowing off the end of a function [...] results in undefined behavior in
1007 // a value-returning function.
1008 // C11 6.9.1p12:
1009 // If the '}' that terminates a function is reached, and the value of the
1010 // function call is used by the caller, the behavior is undefined.
Reid Kleckner9b3e3df2014-09-04 20:04:38 +00001011 if (getLangOpts().CPlusPlus && !FD->hasImplicitReturnZero() && !SawAsmBlock &&
Alp Toker314cc812014-01-25 16:55:45 +00001012 !FD->getReturnType()->isVoidType() && Builder.GetInsertBlock()) {
Alexey Samsonovedf99a92014-11-07 22:29:38 +00001013 if (SanOpts.has(SanitizerKind::Return)) {
Alexey Samsonov24cad992014-07-17 18:46:27 +00001014 SanitizerScope SanScope(this);
Alexey Samsonove396bfc2014-11-11 22:03:54 +00001015 llvm::Value *IsFalse = Builder.getFalse();
1016 EmitCheck(std::make_pair(IsFalse, SanitizerKind::Return),
1017 "missing_return", EmitCheckSourceLocation(FD->getLocation()),
1018 None);
Akira Hatanaka85365cd2015-07-02 22:15:41 +00001019 } else if (CGM.getCodeGenOpts().OptimizationLevel == 0) {
1020 EmitTrapCall(llvm::Intrinsic::trap);
1021 }
Richard Smith9f9e5822012-10-04 23:52:29 +00001022 Builder.CreateUnreachable();
1023 Builder.ClearInsertionPoint();
1024 }
1025
John McCall89b12b32010-02-18 03:17:58 +00001026 // Emit the standard function epilogue.
1027 FinishFunction(BodyRange.getEnd());
John McCall8601a752010-08-03 22:46:07 +00001028
1029 // If we haven't marked the function nothrow through other means, do
1030 // a quick pass now to see if we can.
1031 if (!CurFn->doesNotThrow())
1032 TryMarkNoThrow(CurFn);
Chris Lattner5696e7b2008-06-17 18:05:57 +00001033}
1034
Chris Lattner5b1964b2008-11-11 07:41:27 +00001035/// ContainsLabel - Return true if the statement contains a label in it. If
1036/// this statement is not executed normally, it not containing a label means
1037/// that we can just remove the code.
1038bool CodeGenFunction::ContainsLabel(const Stmt *S, bool IgnoreCaseStmts) {
1039 // Null statement, not a label!
Craig Topper8a13c412014-05-21 05:09:00 +00001040 if (!S) return false;
Mike Stump11289f42009-09-09 15:08:12 +00001041
Chris Lattner5b1964b2008-11-11 07:41:27 +00001042 // If this is a label, we have to emit the code, consider something like:
1043 // if (0) { ... foo: bar(); } goto foo;
Chris Lattner29911cc2011-02-28 00:18:40 +00001044 //
1045 // TODO: If anyone cared, we could track __label__'s, since we know that you
1046 // can't jump to one from outside their declared region.
Chris Lattner5b1964b2008-11-11 07:41:27 +00001047 if (isa<LabelStmt>(S))
1048 return true;
Michael Ilseman686240a2012-12-04 00:29:55 +00001049
Chris Lattner5b1964b2008-11-11 07:41:27 +00001050 // If this is a case/default statement, and we haven't seen a switch, we have
1051 // to emit the code.
1052 if (isa<SwitchCase>(S) && !IgnoreCaseStmts)
1053 return true;
Mike Stump11289f42009-09-09 15:08:12 +00001054
Chris Lattner5b1964b2008-11-11 07:41:27 +00001055 // If this is a switch statement, we want to ignore cases below it.
1056 if (isa<SwitchStmt>(S))
1057 IgnoreCaseStmts = true;
Mike Stump11289f42009-09-09 15:08:12 +00001058
Chris Lattner5b1964b2008-11-11 07:41:27 +00001059 // Scan subexpressions for verboten labels.
Benjamin Kramer642f1732015-07-02 21:03:14 +00001060 for (const Stmt *SubStmt : S->children())
1061 if (ContainsLabel(SubStmt, IgnoreCaseStmts))
Chris Lattner5b1964b2008-11-11 07:41:27 +00001062 return true;
Mike Stump11289f42009-09-09 15:08:12 +00001063
Chris Lattner5b1964b2008-11-11 07:41:27 +00001064 return false;
1065}
1066
Chris Lattner29911cc2011-02-28 00:18:40 +00001067/// containsBreak - Return true if the statement contains a break out of it.
1068/// If the statement (recursively) contains a switch or loop with a break
1069/// inside of it, this is fine.
1070bool CodeGenFunction::containsBreak(const Stmt *S) {
1071 // Null statement, not a label!
Craig Topper8a13c412014-05-21 05:09:00 +00001072 if (!S) return false;
Chris Lattner29911cc2011-02-28 00:18:40 +00001073
1074 // If this is a switch or loop that defines its own break scope, then we can
1075 // include it and anything inside of it.
1076 if (isa<SwitchStmt>(S) || isa<WhileStmt>(S) || isa<DoStmt>(S) ||
1077 isa<ForStmt>(S))
Chris Lattner30db8282011-02-28 00:42:31 +00001078 return false;
Michael Ilseman686240a2012-12-04 00:29:55 +00001079
Chris Lattner30db8282011-02-28 00:42:31 +00001080 if (isa<BreakStmt>(S))
Chris Lattner29911cc2011-02-28 00:18:40 +00001081 return true;
Michael Ilseman686240a2012-12-04 00:29:55 +00001082
Chris Lattner29911cc2011-02-28 00:18:40 +00001083 // Scan subexpressions for verboten breaks.
Benjamin Kramer642f1732015-07-02 21:03:14 +00001084 for (const Stmt *SubStmt : S->children())
1085 if (containsBreak(SubStmt))
Chris Lattner29911cc2011-02-28 00:18:40 +00001086 return true;
Michael Ilseman686240a2012-12-04 00:29:55 +00001087
Chris Lattner29911cc2011-02-28 00:18:40 +00001088 return false;
1089}
1090
Chris Lattnercd439292008-11-12 08:04:58 +00001091
Chris Lattner41c6ab52011-02-27 23:02:32 +00001092/// ConstantFoldsToSimpleInteger - If the specified expression does not fold
1093/// to a constant, or if it does but contains a label, return false. If it
1094/// constant folds return true and set the boolean result in Result.
1095bool CodeGenFunction::ConstantFoldsToSimpleInteger(const Expr *Cond,
1096 bool &ResultBool) {
Richard Trieuc320c742012-07-23 20:21:35 +00001097 llvm::APSInt ResultInt;
Chris Lattner29911cc2011-02-28 00:18:40 +00001098 if (!ConstantFoldsToSimpleInteger(Cond, ResultInt))
1099 return false;
Michael Ilseman686240a2012-12-04 00:29:55 +00001100
Chris Lattner29911cc2011-02-28 00:18:40 +00001101 ResultBool = ResultInt.getBoolValue();
1102 return true;
1103}
1104
1105/// ConstantFoldsToSimpleInteger - If the specified expression does not fold
1106/// to a constant, or if it does but contains a label, return false. If it
1107/// constant folds return true and set the folded value.
1108bool CodeGenFunction::
Richard Trieuc320c742012-07-23 20:21:35 +00001109ConstantFoldsToSimpleInteger(const Expr *Cond, llvm::APSInt &ResultInt) {
Daniel Dunbarf32443c2008-11-12 22:37:10 +00001110 // FIXME: Rename and handle conversion of other evaluatable things
1111 // to bool.
Richard Smith5fab0c92011-12-28 19:48:30 +00001112 llvm::APSInt Int;
1113 if (!Cond->EvaluateAsInt(Int, getContext()))
Chris Lattner41c6ab52011-02-27 23:02:32 +00001114 return false; // Not foldable, not integer or not fully evaluatable.
Richard Smith5fab0c92011-12-28 19:48:30 +00001115
Chris Lattnercd439292008-11-12 08:04:58 +00001116 if (CodeGenFunction::ContainsLabel(Cond))
Chris Lattner41c6ab52011-02-27 23:02:32 +00001117 return false; // Contains a label.
Richard Smith5fab0c92011-12-28 19:48:30 +00001118
1119 ResultInt = Int;
Chris Lattner41c6ab52011-02-27 23:02:32 +00001120 return true;
Chris Lattnercd439292008-11-12 08:04:58 +00001121}
1122
1123
Chris Lattner29911cc2011-02-28 00:18:40 +00001124
Chris Lattnercd439292008-11-12 08:04:58 +00001125/// EmitBranchOnBoolExpr - Emit a branch on a boolean condition (e.g. for an if
1126/// statement) to the specified blocks. Based on the condition, this might try
1127/// to simplify the codegen of the conditional based on the branch.
1128///
1129void CodeGenFunction::EmitBranchOnBoolExpr(const Expr *Cond,
1130 llvm::BasicBlock *TrueBlock,
Justin Bogneref512b92014-01-06 22:27:43 +00001131 llvm::BasicBlock *FalseBlock,
1132 uint64_t TrueCount) {
Peter Collingbourne91147592011-04-15 00:35:48 +00001133 Cond = Cond->IgnoreParens();
Mike Stump11289f42009-09-09 15:08:12 +00001134
Chris Lattnercd439292008-11-12 08:04:58 +00001135 if (const BinaryOperator *CondBOp = dyn_cast<BinaryOperator>(Cond)) {
Justin Bogneref512b92014-01-06 22:27:43 +00001136
Chris Lattnercd439292008-11-12 08:04:58 +00001137 // Handle X && Y in a condition.
John McCalle3027922010-08-25 11:45:40 +00001138 if (CondBOp->getOpcode() == BO_LAnd) {
Chris Lattnercd439292008-11-12 08:04:58 +00001139 // If we have "1 && X", simplify the code. "0 && X" would have constant
1140 // folded if the case was simple enough.
Bill Wendling6c9540e2011-03-04 21:46:03 +00001141 bool ConstantBool = false;
Chris Lattner41c6ab52011-02-27 23:02:32 +00001142 if (ConstantFoldsToSimpleInteger(CondBOp->getLHS(), ConstantBool) &&
1143 ConstantBool) {
Chris Lattnercd439292008-11-12 08:04:58 +00001144 // br(1 && X) -> br(X).
Justin Bogner66242d62015-04-23 23:06:47 +00001145 incrementProfileCounter(CondBOp);
Justin Bogneref512b92014-01-06 22:27:43 +00001146 return EmitBranchOnBoolExpr(CondBOp->getRHS(), TrueBlock, FalseBlock,
1147 TrueCount);
Chris Lattnercd439292008-11-12 08:04:58 +00001148 }
Mike Stump11289f42009-09-09 15:08:12 +00001149
Chris Lattnercd439292008-11-12 08:04:58 +00001150 // If we have "X && 1", simplify the code to use an uncond branch.
1151 // "X && 0" would have been constant folded to 0.
Chris Lattner41c6ab52011-02-27 23:02:32 +00001152 if (ConstantFoldsToSimpleInteger(CondBOp->getRHS(), ConstantBool) &&
1153 ConstantBool) {
Chris Lattnercd439292008-11-12 08:04:58 +00001154 // br(X && 1) -> br(X).
Justin Bogneref512b92014-01-06 22:27:43 +00001155 return EmitBranchOnBoolExpr(CondBOp->getLHS(), TrueBlock, FalseBlock,
1156 TrueCount);
Chris Lattnercd439292008-11-12 08:04:58 +00001157 }
Mike Stump11289f42009-09-09 15:08:12 +00001158
Chris Lattnercd439292008-11-12 08:04:58 +00001159 // Emit the LHS as a conditional. If the LHS conditional is false, we
1160 // want to jump to the FalseBlock.
Daniel Dunbara612e792008-11-13 01:38:36 +00001161 llvm::BasicBlock *LHSTrue = createBasicBlock("land.lhs.true");
Justin Bogneref512b92014-01-06 22:27:43 +00001162 // The counter tells us how often we evaluate RHS, and all of TrueCount
1163 // can be propagated to that branch.
Justin Bogner66242d62015-04-23 23:06:47 +00001164 uint64_t RHSCount = getProfileCount(CondBOp->getRHS());
John McCallce1de612011-01-26 04:00:11 +00001165
1166 ConditionalEvaluation eval(*this);
David Blaikie298720d2015-01-28 19:50:09 +00001167 {
1168 ApplyDebugLocation DL(*this, Cond);
1169 EmitBranchOnBoolExpr(CondBOp->getLHS(), LHSTrue, FalseBlock, RHSCount);
1170 EmitBlock(LHSTrue);
1171 }
Mike Stump11289f42009-09-09 15:08:12 +00001172
Justin Bogner66242d62015-04-23 23:06:47 +00001173 incrementProfileCounter(CondBOp);
1174 setCurrentProfileCount(getProfileCount(CondBOp->getRHS()));
1175
Anders Carlsson60ddba62010-01-24 00:20:05 +00001176 // Any temporaries created here are conditional.
John McCallce1de612011-01-26 04:00:11 +00001177 eval.begin(*this);
Justin Bogneref512b92014-01-06 22:27:43 +00001178 EmitBranchOnBoolExpr(CondBOp->getRHS(), TrueBlock, FalseBlock, TrueCount);
John McCallce1de612011-01-26 04:00:11 +00001179 eval.end(*this);
Anders Carlsson60ddba62010-01-24 00:20:05 +00001180
Chris Lattnercd439292008-11-12 08:04:58 +00001181 return;
Chris Lattner41c6ab52011-02-27 23:02:32 +00001182 }
Michael Ilseman686240a2012-12-04 00:29:55 +00001183
Chris Lattner41c6ab52011-02-27 23:02:32 +00001184 if (CondBOp->getOpcode() == BO_LOr) {
Chris Lattnercd439292008-11-12 08:04:58 +00001185 // If we have "0 || X", simplify the code. "1 || X" would have constant
1186 // folded if the case was simple enough.
Bill Wendling6c9540e2011-03-04 21:46:03 +00001187 bool ConstantBool = false;
Chris Lattner41c6ab52011-02-27 23:02:32 +00001188 if (ConstantFoldsToSimpleInteger(CondBOp->getLHS(), ConstantBool) &&
1189 !ConstantBool) {
Chris Lattnercd439292008-11-12 08:04:58 +00001190 // br(0 || X) -> br(X).
Justin Bogner66242d62015-04-23 23:06:47 +00001191 incrementProfileCounter(CondBOp);
Justin Bogneref512b92014-01-06 22:27:43 +00001192 return EmitBranchOnBoolExpr(CondBOp->getRHS(), TrueBlock, FalseBlock,
1193 TrueCount);
Chris Lattnercd439292008-11-12 08:04:58 +00001194 }
Mike Stump11289f42009-09-09 15:08:12 +00001195
Chris Lattnercd439292008-11-12 08:04:58 +00001196 // If we have "X || 0", simplify the code to use an uncond branch.
1197 // "X || 1" would have been constant folded to 1.
Chris Lattner41c6ab52011-02-27 23:02:32 +00001198 if (ConstantFoldsToSimpleInteger(CondBOp->getRHS(), ConstantBool) &&
1199 !ConstantBool) {
Chris Lattnercd439292008-11-12 08:04:58 +00001200 // br(X || 0) -> br(X).
Justin Bogneref512b92014-01-06 22:27:43 +00001201 return EmitBranchOnBoolExpr(CondBOp->getLHS(), TrueBlock, FalseBlock,
1202 TrueCount);
Chris Lattnercd439292008-11-12 08:04:58 +00001203 }
Mike Stump11289f42009-09-09 15:08:12 +00001204
Chris Lattnercd439292008-11-12 08:04:58 +00001205 // Emit the LHS as a conditional. If the LHS conditional is true, we
1206 // want to jump to the TrueBlock.
Daniel Dunbara612e792008-11-13 01:38:36 +00001207 llvm::BasicBlock *LHSFalse = createBasicBlock("lor.lhs.false");
Justin Bogneref512b92014-01-06 22:27:43 +00001208 // We have the count for entry to the RHS and for the whole expression
1209 // being true, so we can divy up True count between the short circuit and
1210 // the RHS.
Justin Bogner66242d62015-04-23 23:06:47 +00001211 uint64_t LHSCount =
1212 getCurrentProfileCount() - getProfileCount(CondBOp->getRHS());
Justin Bogneref512b92014-01-06 22:27:43 +00001213 uint64_t RHSCount = TrueCount - LHSCount;
John McCallce1de612011-01-26 04:00:11 +00001214
1215 ConditionalEvaluation eval(*this);
David Blaikie298720d2015-01-28 19:50:09 +00001216 {
1217 ApplyDebugLocation DL(*this, Cond);
1218 EmitBranchOnBoolExpr(CondBOp->getLHS(), TrueBlock, LHSFalse, LHSCount);
1219 EmitBlock(LHSFalse);
1220 }
Mike Stump11289f42009-09-09 15:08:12 +00001221
Justin Bogner66242d62015-04-23 23:06:47 +00001222 incrementProfileCounter(CondBOp);
1223 setCurrentProfileCount(getProfileCount(CondBOp->getRHS()));
1224
Anders Carlsson60ddba62010-01-24 00:20:05 +00001225 // Any temporaries created here are conditional.
John McCallce1de612011-01-26 04:00:11 +00001226 eval.begin(*this);
Justin Bogneref512b92014-01-06 22:27:43 +00001227 EmitBranchOnBoolExpr(CondBOp->getRHS(), TrueBlock, FalseBlock, RHSCount);
1228
John McCallce1de612011-01-26 04:00:11 +00001229 eval.end(*this);
Anders Carlsson60ddba62010-01-24 00:20:05 +00001230
Chris Lattnercd439292008-11-12 08:04:58 +00001231 return;
1232 }
Chris Lattnerd9537732008-11-12 08:13:36 +00001233 }
Mike Stump11289f42009-09-09 15:08:12 +00001234
Chris Lattnerd9537732008-11-12 08:13:36 +00001235 if (const UnaryOperator *CondUOp = dyn_cast<UnaryOperator>(Cond)) {
1236 // br(!x, t, f) -> br(x, f, t)
Justin Bogneref512b92014-01-06 22:27:43 +00001237 if (CondUOp->getOpcode() == UO_LNot) {
1238 // Negate the count.
Justin Bogner66242d62015-04-23 23:06:47 +00001239 uint64_t FalseCount = getCurrentProfileCount() - TrueCount;
Justin Bogneref512b92014-01-06 22:27:43 +00001240 // Negate the condition and swap the destination blocks.
1241 return EmitBranchOnBoolExpr(CondUOp->getSubExpr(), FalseBlock, TrueBlock,
1242 FalseCount);
1243 }
Chris Lattnercd439292008-11-12 08:04:58 +00001244 }
Mike Stump11289f42009-09-09 15:08:12 +00001245
Daniel Dunbarbf3c22e2008-11-12 10:30:32 +00001246 if (const ConditionalOperator *CondOp = dyn_cast<ConditionalOperator>(Cond)) {
Eli Friedman248f8982012-02-14 03:54:45 +00001247 // br(c ? x : y, t, f) -> br(c, br(x, t, f), br(y, t, f))
1248 llvm::BasicBlock *LHSBlock = createBasicBlock("cond.true");
1249 llvm::BasicBlock *RHSBlock = createBasicBlock("cond.false");
Daniel Dunbarbf3c22e2008-11-12 10:30:32 +00001250
Eli Friedman248f8982012-02-14 03:54:45 +00001251 ConditionalEvaluation cond(*this);
Justin Bogner66242d62015-04-23 23:06:47 +00001252 EmitBranchOnBoolExpr(CondOp->getCond(), LHSBlock, RHSBlock,
1253 getProfileCount(CondOp));
Justin Bogneref512b92014-01-06 22:27:43 +00001254
1255 // When computing PGO branch weights, we only know the overall count for
1256 // the true block. This code is essentially doing tail duplication of the
1257 // naive code-gen, introducing new edges for which counts are not
1258 // available. Divide the counts proportionally between the LHS and RHS of
1259 // the conditional operator.
1260 uint64_t LHSScaledTrueCount = 0;
1261 if (TrueCount) {
Justin Bogner66242d62015-04-23 23:06:47 +00001262 double LHSRatio =
1263 getProfileCount(CondOp) / (double)getCurrentProfileCount();
Justin Bogneref512b92014-01-06 22:27:43 +00001264 LHSScaledTrueCount = TrueCount * LHSRatio;
1265 }
John McCallce1de612011-01-26 04:00:11 +00001266
Eli Friedman248f8982012-02-14 03:54:45 +00001267 cond.begin(*this);
1268 EmitBlock(LHSBlock);
Justin Bogner66242d62015-04-23 23:06:47 +00001269 incrementProfileCounter(CondOp);
David Blaikie298720d2015-01-28 19:50:09 +00001270 {
1271 ApplyDebugLocation DL(*this, Cond);
1272 EmitBranchOnBoolExpr(CondOp->getLHS(), TrueBlock, FalseBlock,
1273 LHSScaledTrueCount);
1274 }
Eli Friedman248f8982012-02-14 03:54:45 +00001275 cond.end(*this);
John McCallce1de612011-01-26 04:00:11 +00001276
Eli Friedman248f8982012-02-14 03:54:45 +00001277 cond.begin(*this);
1278 EmitBlock(RHSBlock);
Justin Bogneref512b92014-01-06 22:27:43 +00001279 EmitBranchOnBoolExpr(CondOp->getRHS(), TrueBlock, FalseBlock,
1280 TrueCount - LHSScaledTrueCount);
Eli Friedman248f8982012-02-14 03:54:45 +00001281 cond.end(*this);
John McCallce1de612011-01-26 04:00:11 +00001282
Eli Friedman248f8982012-02-14 03:54:45 +00001283 return;
Daniel Dunbarbf3c22e2008-11-12 10:30:32 +00001284 }
1285
Richard Smithea852322013-05-07 21:53:22 +00001286 if (const CXXThrowExpr *Throw = dyn_cast<CXXThrowExpr>(Cond)) {
1287 // Conditional operator handling can give us a throw expression as a
1288 // condition for a case like:
1289 // br(c ? throw x : y, t, f) -> br(c, br(throw x, t, f), br(y, t, f)
1290 // Fold this to:
1291 // br(c, throw x, br(y, t, f))
1292 EmitCXXThrowExpr(Throw, /*KeepInsertionPoint*/false);
1293 return;
1294 }
1295
Sanjay Patela24296b2015-09-02 20:01:30 +00001296 // If the branch has a condition wrapped by __builtin_unpredictable,
1297 // create metadata that specifies that the branch is unpredictable.
1298 // Don't bother if not optimizing because that metadata would not be used.
1299 llvm::MDNode *Unpredictable = nullptr;
1300 if (CGM.getCodeGenOpts().OptimizationLevel != 0) {
1301 if (const CallExpr *Call = dyn_cast<CallExpr>(Cond)) {
1302 const Decl *TargetDecl = Call->getCalleeDecl();
1303 if (const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(TargetDecl)) {
1304 if (FD->getBuiltinID() == Builtin::BI__builtin_unpredictable) {
1305 llvm::MDBuilder MDHelper(getLLVMContext());
1306 Unpredictable = MDHelper.createUnpredictable();
1307 }
1308 }
1309 }
1310 }
1311
Justin Bogneref512b92014-01-06 22:27:43 +00001312 // Create branch weights based on the number of times we get here and the
1313 // number of times the condition should be true.
Justin Bogner66242d62015-04-23 23:06:47 +00001314 uint64_t CurrentCount = std::max(getCurrentProfileCount(), TrueCount);
Justin Bogner65512642015-05-02 05:00:55 +00001315 llvm::MDNode *Weights =
1316 createProfileWeights(TrueCount, CurrentCount - TrueCount);
Justin Bogneref512b92014-01-06 22:27:43 +00001317
Chris Lattnercd439292008-11-12 08:04:58 +00001318 // Emit the code with the fully general case.
David Blaikie303facb2015-01-31 01:10:11 +00001319 llvm::Value *CondV;
1320 {
1321 ApplyDebugLocation DL(*this, Cond);
1322 CondV = EvaluateExprAsBool(Cond);
1323 }
Sanjay Patela24296b2015-09-02 20:01:30 +00001324 Builder.CreateCondBr(CondV, TrueBlock, FalseBlock, Weights, Unpredictable);
Chris Lattnercd439292008-11-12 08:04:58 +00001325}
1326
Daniel Dunbara7c8cf62008-08-16 00:56:44 +00001327/// ErrorUnsupported - Print out an error that codegen doesn't support the
Chris Lattnerfc944342007-12-02 01:43:38 +00001328/// specified stmt yet.
David Blaikie4a9ec7b2013-08-19 21:02:26 +00001329void CodeGenFunction::ErrorUnsupported(const Stmt *S, const char *Type) {
1330 CGM.ErrorUnsupported(S, Type);
Chris Lattnerfc944342007-12-02 01:43:38 +00001331}
1332
John McCall2725aa12011-02-01 21:35:06 +00001333/// emitNonZeroVLAInit - Emit the "zero" initialization of a
1334/// variable-length array whose elements have a non-zero bit-pattern.
1335///
James Dennettbe302452012-06-15 22:10:14 +00001336/// \param baseType the inner-most element type of the array
John McCall2725aa12011-02-01 21:35:06 +00001337/// \param src - a char* pointing to the bit-pattern for a single
1338/// base element of the array
1339/// \param sizeInChars - the total size of the VLA, in chars
John McCall2725aa12011-02-01 21:35:06 +00001340static void emitNonZeroVLAInit(CodeGenFunction &CGF, QualType baseType,
John McCall7f416cc2015-09-08 08:05:57 +00001341 Address dest, Address src,
John McCall2725aa12011-02-01 21:35:06 +00001342 llvm::Value *sizeInChars) {
John McCall2725aa12011-02-01 21:35:06 +00001343 CGBuilderTy &Builder = CGF.Builder;
1344
John McCall7f416cc2015-09-08 08:05:57 +00001345 CharUnits baseSize = CGF.getContext().getTypeSizeInChars(baseType);
John McCall2725aa12011-02-01 21:35:06 +00001346 llvm::Value *baseSizeInChars
John McCall7f416cc2015-09-08 08:05:57 +00001347 = llvm::ConstantInt::get(CGF.IntPtrTy, baseSize.getQuantity());
John McCall2725aa12011-02-01 21:35:06 +00001348
John McCall7f416cc2015-09-08 08:05:57 +00001349 Address begin =
1350 Builder.CreateElementBitCast(dest, CGF.Int8Ty, "vla.begin");
1351 llvm::Value *end =
1352 Builder.CreateInBoundsGEP(begin.getPointer(), sizeInChars, "vla.end");
John McCall2725aa12011-02-01 21:35:06 +00001353
1354 llvm::BasicBlock *originBB = CGF.Builder.GetInsertBlock();
1355 llvm::BasicBlock *loopBB = CGF.createBasicBlock("vla-init.loop");
1356 llvm::BasicBlock *contBB = CGF.createBasicBlock("vla-init.cont");
1357
1358 // Make a loop over the VLA. C99 guarantees that the VLA element
1359 // count must be nonzero.
1360 CGF.EmitBlock(loopBB);
1361
John McCall7f416cc2015-09-08 08:05:57 +00001362 llvm::PHINode *cur = Builder.CreatePHI(begin.getType(), 2, "vla.cur");
1363 cur->addIncoming(begin.getPointer(), originBB);
1364
1365 CharUnits curAlign =
1366 dest.getAlignment().alignmentOfArrayElement(baseSize);
John McCall2725aa12011-02-01 21:35:06 +00001367
1368 // memcpy the individual element bit-pattern.
John McCall7f416cc2015-09-08 08:05:57 +00001369 Builder.CreateMemCpy(Address(cur, curAlign), src, baseSizeInChars,
John McCall2725aa12011-02-01 21:35:06 +00001370 /*volatile*/ false);
1371
1372 // Go to the next element.
John McCall7f416cc2015-09-08 08:05:57 +00001373 llvm::Value *next =
1374 Builder.CreateInBoundsGEP(CGF.Int8Ty, cur, baseSizeInChars, "vla.next");
John McCall2725aa12011-02-01 21:35:06 +00001375
1376 // Leave if that's the end of the VLA.
1377 llvm::Value *done = Builder.CreateICmpEQ(next, end, "vla-init.isdone");
1378 Builder.CreateCondBr(done, contBB, loopBB);
1379 cur->addIncoming(next, loopBB);
1380
1381 CGF.EmitBlock(contBB);
Michael Ilseman686240a2012-12-04 00:29:55 +00001382}
John McCall2725aa12011-02-01 21:35:06 +00001383
Anders Carlssonc0964b62010-05-22 17:35:42 +00001384void
John McCall7f416cc2015-09-08 08:05:57 +00001385CodeGenFunction::EmitNullInitialization(Address DestPtr, QualType Ty) {
Anders Carlsson16e94af2010-05-03 01:20:20 +00001386 // Ignore empty classes in C++.
Richard Smith9c6890a2012-11-01 22:30:59 +00001387 if (getLangOpts().CPlusPlus) {
Anders Carlsson16e94af2010-05-03 01:20:20 +00001388 if (const RecordType *RT = Ty->getAs<RecordType>()) {
1389 if (cast<CXXRecordDecl>(RT->getDecl())->isEmpty())
1390 return;
1391 }
1392 }
John McCall7cd1d972010-08-07 08:21:30 +00001393
1394 // Cast the dest ptr to the appropriate i8 pointer type.
John McCall7f416cc2015-09-08 08:05:57 +00001395 if (DestPtr.getElementType() != Int8Ty)
1396 DestPtr = Builder.CreateElementBitCast(DestPtr, Int8Ty);
Anders Carlsson2e744e82008-08-30 19:51:14 +00001397
1398 // Get size and alignment info for this aggregate.
John McCall7f416cc2015-09-08 08:05:57 +00001399 CharUnits size = getContext().getTypeSizeInChars(Ty);
Anders Carlsson2e744e82008-08-30 19:51:14 +00001400
John McCalla08ffd22011-01-14 10:37:58 +00001401 llvm::Value *SizeVal;
John McCall2725aa12011-02-01 21:35:06 +00001402 const VariableArrayType *vla;
Mike Stump11289f42009-09-09 15:08:12 +00001403
John McCalla08ffd22011-01-14 10:37:58 +00001404 // Don't bother emitting a zero-byte memset.
John McCall7f416cc2015-09-08 08:05:57 +00001405 if (size.isZero()) {
John McCalla08ffd22011-01-14 10:37:58 +00001406 // But note that getTypeInfo returns 0 for a VLA.
1407 if (const VariableArrayType *vlaType =
1408 dyn_cast_or_null<VariableArrayType>(
1409 getContext().getAsArrayType(Ty))) {
John McCall23c29fe2011-06-24 21:55:10 +00001410 QualType eltType;
1411 llvm::Value *numElts;
Benjamin Kramer867ea1d2014-03-02 13:01:17 +00001412 std::tie(numElts, eltType) = getVLASize(vlaType);
John McCall23c29fe2011-06-24 21:55:10 +00001413
1414 SizeVal = numElts;
1415 CharUnits eltSize = getContext().getTypeSizeInChars(eltType);
1416 if (!eltSize.isOne())
1417 SizeVal = Builder.CreateNUWMul(SizeVal, CGM.getSize(eltSize));
John McCall2725aa12011-02-01 21:35:06 +00001418 vla = vlaType;
John McCalla08ffd22011-01-14 10:37:58 +00001419 } else {
1420 return;
1421 }
1422 } else {
John McCall7f416cc2015-09-08 08:05:57 +00001423 SizeVal = CGM.getSize(size);
Craig Topper8a13c412014-05-21 05:09:00 +00001424 vla = nullptr;
John McCalla08ffd22011-01-14 10:37:58 +00001425 }
John McCall7cd1d972010-08-07 08:21:30 +00001426
1427 // If the type contains a pointer to data member we can't memset it to zero.
1428 // Instead, create a null constant and copy it to the destination.
John McCall2725aa12011-02-01 21:35:06 +00001429 // TODO: there are other patterns besides zero that we can usefully memset,
1430 // like -1, which happens to be the pattern used by member-pointers.
John McCall614dbdc2010-08-22 21:01:12 +00001431 if (!CGM.getTypes().isZeroInitializable(Ty)) {
John McCall2725aa12011-02-01 21:35:06 +00001432 // For a VLA, emit a single element, then splat that over the VLA.
1433 if (vla) Ty = getContext().getBaseElementType(vla);
John McCalla08ffd22011-01-14 10:37:58 +00001434
John McCall7cd1d972010-08-07 08:21:30 +00001435 llvm::Constant *NullConstant = CGM.EmitNullConstant(Ty);
1436
Michael Ilseman686240a2012-12-04 00:29:55 +00001437 llvm::GlobalVariable *NullVariable =
John McCall7cd1d972010-08-07 08:21:30 +00001438 new llvm::GlobalVariable(CGM.getModule(), NullConstant->getType(),
Michael Ilseman686240a2012-12-04 00:29:55 +00001439 /*isConstant=*/true,
John McCall7cd1d972010-08-07 08:21:30 +00001440 llvm::GlobalVariable::PrivateLinkage,
Chris Lattner0e62c1c2011-07-23 10:55:15 +00001441 NullConstant, Twine());
John McCall7f416cc2015-09-08 08:05:57 +00001442 CharUnits NullAlign = DestPtr.getAlignment();
1443 NullVariable->setAlignment(NullAlign.getQuantity());
1444 Address SrcPtr(Builder.CreateBitCast(NullVariable, Builder.getInt8PtrTy()),
1445 NullAlign);
John McCall7cd1d972010-08-07 08:21:30 +00001446
John McCall2725aa12011-02-01 21:35:06 +00001447 if (vla) return emitNonZeroVLAInit(*this, Ty, DestPtr, SrcPtr, SizeVal);
1448
John McCall7cd1d972010-08-07 08:21:30 +00001449 // Get and call the appropriate llvm.memcpy overload.
John McCall7f416cc2015-09-08 08:05:57 +00001450 Builder.CreateMemCpy(DestPtr, SrcPtr, SizeVal, false);
John McCall7cd1d972010-08-07 08:21:30 +00001451 return;
Michael Ilseman686240a2012-12-04 00:29:55 +00001452 }
1453
John McCall7cd1d972010-08-07 08:21:30 +00001454 // Otherwise, just memset the whole thing to zero. This is legal
1455 // because in LLVM, all default initializers (other than the ones we just
1456 // handled above) are guaranteed to have a bit pattern of all zeros.
John McCall7f416cc2015-09-08 08:05:57 +00001457 Builder.CreateMemSet(DestPtr, Builder.getInt8(0), SizeVal, false);
Anders Carlsson2e744e82008-08-30 19:51:14 +00001458}
1459
Chris Lattnerc8e630e2011-02-17 07:39:24 +00001460llvm::BlockAddress *CodeGenFunction::GetAddrOfLabel(const LabelDecl *L) {
Chris Lattner6c4d2552009-10-28 23:59:40 +00001461 // Make sure that there is a block for the indirect goto.
Craig Topper8a13c412014-05-21 05:09:00 +00001462 if (!IndirectBranch)
Chris Lattner6c4d2552009-10-28 23:59:40 +00001463 GetIndirectGotoBlock();
Michael Ilseman686240a2012-12-04 00:29:55 +00001464
John McCallad5d61e2010-07-23 21:56:41 +00001465 llvm::BasicBlock *BB = getJumpDestForLabel(L).getBlock();
Michael Ilseman686240a2012-12-04 00:29:55 +00001466
Chris Lattner6c4d2552009-10-28 23:59:40 +00001467 // Make sure the indirect branch includes all of the address-taken blocks.
1468 IndirectBranch->addDestination(BB);
1469 return llvm::BlockAddress::get(CurFn, BB);
Chris Lattner2bb5cb42009-10-13 06:55:33 +00001470}
1471
1472llvm::BasicBlock *CodeGenFunction::GetIndirectGotoBlock() {
Chris Lattner6c4d2552009-10-28 23:59:40 +00001473 // If we already made the indirect branch for indirect goto, return its block.
1474 if (IndirectBranch) return IndirectBranch->getParent();
Michael Ilseman686240a2012-12-04 00:29:55 +00001475
John McCall7f416cc2015-09-08 08:05:57 +00001476 CGBuilderTy TmpBuilder(*this, createBasicBlock("indirectgoto"));
Michael Ilseman686240a2012-12-04 00:29:55 +00001477
Chris Lattner2bb5cb42009-10-13 06:55:33 +00001478 // Create the PHI node that indirect gotos will add entries to.
Jay Foad20c0f022011-03-30 11:28:58 +00001479 llvm::Value *DestVal = TmpBuilder.CreatePHI(Int8PtrTy, 0,
1480 "indirect.goto.dest");
Michael Ilseman686240a2012-12-04 00:29:55 +00001481
Chris Lattner6c4d2552009-10-28 23:59:40 +00001482 // Create the indirect branch instruction.
1483 IndirectBranch = TmpBuilder.CreateIndirectBr(DestVal);
1484 return IndirectBranch->getParent();
Daniel Dunbar88402ce2008-08-04 16:51:22 +00001485}
Anders Carlsson13abd7e2008-11-04 05:30:00 +00001486
John McCall82fe67b2011-07-09 01:37:26 +00001487/// Computes the length of an array in elements, as well as the base
1488/// element type and a properly-typed first element pointer.
1489llvm::Value *CodeGenFunction::emitArrayLength(const ArrayType *origArrayType,
1490 QualType &baseType,
John McCall7f416cc2015-09-08 08:05:57 +00001491 Address &addr) {
John McCall82fe67b2011-07-09 01:37:26 +00001492 const ArrayType *arrayType = origArrayType;
1493
1494 // If it's a VLA, we have to load the stored size. Note that
1495 // this is the size of the VLA in bytes, not its size in elements.
Craig Topper8a13c412014-05-21 05:09:00 +00001496 llvm::Value *numVLAElements = nullptr;
John McCall82fe67b2011-07-09 01:37:26 +00001497 if (isa<VariableArrayType>(arrayType)) {
1498 numVLAElements = getVLASize(cast<VariableArrayType>(arrayType)).first;
1499
1500 // Walk into all VLAs. This doesn't require changes to addr,
1501 // which has type T* where T is the first non-VLA element type.
1502 do {
1503 QualType elementType = arrayType->getElementType();
1504 arrayType = getContext().getAsArrayType(elementType);
1505
1506 // If we only have VLA components, 'addr' requires no adjustment.
1507 if (!arrayType) {
1508 baseType = elementType;
1509 return numVLAElements;
1510 }
1511 } while (isa<VariableArrayType>(arrayType));
1512
1513 // We get out here only if we find a constant array type
1514 // inside the VLA.
1515 }
1516
1517 // We have some number of constant-length arrays, so addr should
1518 // have LLVM type [M x [N x [...]]]*. Build a GEP that walks
1519 // down to the first element of addr.
Chris Lattner0e62c1c2011-07-23 10:55:15 +00001520 SmallVector<llvm::Value*, 8> gepIndices;
John McCall82fe67b2011-07-09 01:37:26 +00001521
1522 // GEP down to the array type.
1523 llvm::ConstantInt *zero = Builder.getInt32(0);
1524 gepIndices.push_back(zero);
1525
John McCall82fe67b2011-07-09 01:37:26 +00001526 uint64_t countFromCLAs = 1;
Richard Smithf3c37e82012-04-22 05:51:36 +00001527 QualType eltType;
John McCall82fe67b2011-07-09 01:37:26 +00001528
Chris Lattner2192fe52011-07-18 04:24:23 +00001529 llvm::ArrayType *llvmArrayType =
John McCall7f416cc2015-09-08 08:05:57 +00001530 dyn_cast<llvm::ArrayType>(addr.getElementType());
Richard Smithf3c37e82012-04-22 05:51:36 +00001531 while (llvmArrayType) {
John McCall82fe67b2011-07-09 01:37:26 +00001532 assert(isa<ConstantArrayType>(arrayType));
1533 assert(cast<ConstantArrayType>(arrayType)->getSize().getZExtValue()
1534 == llvmArrayType->getNumElements());
1535
1536 gepIndices.push_back(zero);
1537 countFromCLAs *= llvmArrayType->getNumElements();
Richard Smithf3c37e82012-04-22 05:51:36 +00001538 eltType = arrayType->getElementType();
John McCall82fe67b2011-07-09 01:37:26 +00001539
1540 llvmArrayType =
1541 dyn_cast<llvm::ArrayType>(llvmArrayType->getElementType());
John McCall82fe67b2011-07-09 01:37:26 +00001542 arrayType = getContext().getAsArrayType(arrayType->getElementType());
Richard Smithf3c37e82012-04-22 05:51:36 +00001543 assert((!llvmArrayType || arrayType) &&
1544 "LLVM and Clang types are out-of-synch");
John McCall82fe67b2011-07-09 01:37:26 +00001545 }
1546
Richard Smithf3c37e82012-04-22 05:51:36 +00001547 if (arrayType) {
1548 // From this point onwards, the Clang array type has been emitted
1549 // as some other type (probably a packed struct). Compute the array
1550 // size, and just emit the 'begin' expression as a bitcast.
1551 while (arrayType) {
1552 countFromCLAs *=
1553 cast<ConstantArrayType>(arrayType)->getSize().getZExtValue();
1554 eltType = arrayType->getElementType();
1555 arrayType = getContext().getAsArrayType(eltType);
1556 }
John McCall82fe67b2011-07-09 01:37:26 +00001557
John McCall7f416cc2015-09-08 08:05:57 +00001558 llvm::Type *baseType = ConvertType(eltType);
1559 addr = Builder.CreateElementBitCast(addr, baseType, "array.begin");
Richard Smithf3c37e82012-04-22 05:51:36 +00001560 } else {
1561 // Create the actual GEP.
John McCall7f416cc2015-09-08 08:05:57 +00001562 addr = Address(Builder.CreateInBoundsGEP(addr.getPointer(),
1563 gepIndices, "array.begin"),
1564 addr.getAlignment());
Richard Smithf3c37e82012-04-22 05:51:36 +00001565 }
1566
1567 baseType = eltType;
John McCall82fe67b2011-07-09 01:37:26 +00001568
1569 llvm::Value *numElements
1570 = llvm::ConstantInt::get(SizeTy, countFromCLAs);
1571
1572 // If we had any VLA dimensions, factor them in.
1573 if (numVLAElements)
1574 numElements = Builder.CreateNUWMul(numVLAElements, numElements);
1575
1576 return numElements;
1577}
1578
John McCall23c29fe2011-06-24 21:55:10 +00001579std::pair<llvm::Value*, QualType>
1580CodeGenFunction::getVLASize(QualType type) {
1581 const VariableArrayType *vla = getContext().getAsVariableArrayType(type);
1582 assert(vla && "type was not a variable array type!");
1583 return getVLASize(vla);
Anders Carlssone388a5b2008-12-20 20:27:15 +00001584}
Anders Carlssonccbe9202008-12-12 07:19:02 +00001585
John McCall23c29fe2011-06-24 21:55:10 +00001586std::pair<llvm::Value*, QualType>
1587CodeGenFunction::getVLASize(const VariableArrayType *type) {
1588 // The number of elements so far; always size_t.
Craig Topper8a13c412014-05-21 05:09:00 +00001589 llvm::Value *numElements = nullptr;
John McCall23c29fe2011-06-24 21:55:10 +00001590
1591 QualType elementType;
1592 do {
1593 elementType = type->getElementType();
1594 llvm::Value *vlaSize = VLASizeMap[type->getSizeExpr()];
1595 assert(vlaSize && "no size for VLA!");
1596 assert(vlaSize->getType() == SizeTy);
1597
1598 if (!numElements) {
1599 numElements = vlaSize;
1600 } else {
1601 // It's undefined behavior if this wraps around, so mark it that way.
Alexey Samsonovcb3f8122014-03-20 10:48:29 +00001602 // FIXME: Teach -fsanitize=undefined to trap this.
John McCall23c29fe2011-06-24 21:55:10 +00001603 numElements = Builder.CreateNUWMul(numElements, vlaSize);
1604 }
1605 } while ((type = getContext().getAsVariableArrayType(elementType)));
1606
1607 return std::pair<llvm::Value*,QualType>(numElements, elementType);
1608}
1609
1610void CodeGenFunction::EmitVariablyModifiedType(QualType type) {
1611 assert(type->isVariablyModifiedType() &&
Anders Carlsson8a01b792008-12-20 20:46:34 +00001612 "Must pass variably modified type to EmitVLASizes!");
Mike Stump11289f42009-09-09 15:08:12 +00001613
Daniel Dunbarb6adc432009-07-19 06:58:07 +00001614 EnsureInsertPoint();
Mike Stump11289f42009-09-09 15:08:12 +00001615
John McCall23c29fe2011-06-24 21:55:10 +00001616 // We're going to walk down into the type and look for VLA
1617 // expressions.
John McCall23c29fe2011-06-24 21:55:10 +00001618 do {
1619 assert(type->isVariablyModifiedType());
Mike Stump11289f42009-09-09 15:08:12 +00001620
John McCall23c29fe2011-06-24 21:55:10 +00001621 const Type *ty = type.getTypePtr();
1622 switch (ty->getTypeClass()) {
Abramo Bagnara1cd83682012-01-07 10:52:36 +00001623
John McCall23c29fe2011-06-24 21:55:10 +00001624#define TYPE(Class, Base)
1625#define ABSTRACT_TYPE(Class, Base)
Abramo Bagnara1cd83682012-01-07 10:52:36 +00001626#define NON_CANONICAL_TYPE(Class, Base)
John McCall23c29fe2011-06-24 21:55:10 +00001627#define DEPENDENT_TYPE(Class, Base) case Type::Class:
Abramo Bagnara1cd83682012-01-07 10:52:36 +00001628#define NON_CANONICAL_UNLESS_DEPENDENT_TYPE(Class, Base)
John McCall23c29fe2011-06-24 21:55:10 +00001629#include "clang/AST/TypeNodes.def"
Abramo Bagnara1cd83682012-01-07 10:52:36 +00001630 llvm_unreachable("unexpected dependent type!");
Mike Stump11289f42009-09-09 15:08:12 +00001631
John McCall23c29fe2011-06-24 21:55:10 +00001632 // These types are never variably-modified.
1633 case Type::Builtin:
1634 case Type::Complex:
1635 case Type::Vector:
1636 case Type::ExtVector:
1637 case Type::Record:
1638 case Type::Enum:
Abramo Bagnarafa95ed42012-01-11 08:19:46 +00001639 case Type::Elaborated:
1640 case Type::TemplateSpecialization:
John McCall23c29fe2011-06-24 21:55:10 +00001641 case Type::ObjCObject:
1642 case Type::ObjCInterface:
1643 case Type::ObjCObjectPointer:
1644 llvm_unreachable("type class is never variably-modified!");
Mike Stump11289f42009-09-09 15:08:12 +00001645
Reid Kleckner0503a872013-12-05 01:23:43 +00001646 case Type::Adjusted:
1647 type = cast<AdjustedType>(ty)->getAdjustedType();
1648 break;
1649
Reid Kleckner8a365022013-06-24 17:51:48 +00001650 case Type::Decayed:
1651 type = cast<DecayedType>(ty)->getPointeeType();
1652 break;
1653
John McCall23c29fe2011-06-24 21:55:10 +00001654 case Type::Pointer:
1655 type = cast<PointerType>(ty)->getPointeeType();
1656 break;
Mike Stump11289f42009-09-09 15:08:12 +00001657
John McCall23c29fe2011-06-24 21:55:10 +00001658 case Type::BlockPointer:
1659 type = cast<BlockPointerType>(ty)->getPointeeType();
1660 break;
1661
1662 case Type::LValueReference:
1663 case Type::RValueReference:
1664 type = cast<ReferenceType>(ty)->getPointeeType();
1665 break;
1666
1667 case Type::MemberPointer:
1668 type = cast<MemberPointerType>(ty)->getPointeeType();
1669 break;
1670
1671 case Type::ConstantArray:
1672 case Type::IncompleteArray:
1673 // Losing element qualification here is fine.
1674 type = cast<ArrayType>(ty)->getElementType();
1675 break;
1676
1677 case Type::VariableArray: {
1678 // Losing element qualification here is fine.
1679 const VariableArrayType *vat = cast<VariableArrayType>(ty);
1680
1681 // Unknown size indication requires no size computation.
1682 // Otherwise, evaluate and record it.
1683 if (const Expr *size = vat->getSizeExpr()) {
1684 // It's possible that we might have emitted this already,
1685 // e.g. with a typedef and a pointer to it.
1686 llvm::Value *&entry = VLASizeMap[size];
1687 if (!entry) {
Richard Smith481652b2012-10-10 01:11:12 +00001688 llvm::Value *Size = EmitScalarExpr(size);
1689
1690 // C11 6.7.6.2p5:
1691 // If the size is an expression that is not an integer constant
1692 // expression [...] each time it is evaluated it shall have a value
1693 // greater than zero.
Alexey Samsonovedf99a92014-11-07 22:29:38 +00001694 if (SanOpts.has(SanitizerKind::VLABound) &&
Richard Smithb1b0ab42012-11-05 22:21:05 +00001695 size->getType()->isSignedIntegerType()) {
Alexey Samsonov24cad992014-07-17 18:46:27 +00001696 SanitizerScope SanScope(this);
Richard Smith481652b2012-10-10 01:11:12 +00001697 llvm::Value *Zero = llvm::Constant::getNullValue(Size->getType());
1698 llvm::Constant *StaticArgs[] = {
1699 EmitCheckSourceLocation(size->getLocStart()),
1700 EmitCheckTypeDescriptor(size->getType())
1701 };
Alexey Samsonove396bfc2014-11-11 22:03:54 +00001702 EmitCheck(std::make_pair(Builder.CreateICmpSGT(Size, Zero),
1703 SanitizerKind::VLABound),
1704 "vla_bound_not_positive", StaticArgs, Size);
Richard Smith481652b2012-10-10 01:11:12 +00001705 }
1706
John McCall23c29fe2011-06-24 21:55:10 +00001707 // Always zexting here would be wrong if it weren't
1708 // undefined behavior to have a negative bound.
Richard Smith8772bd82012-10-10 01:12:11 +00001709 entry = Builder.CreateIntCast(Size, SizeTy, /*signed*/ false);
John McCall23c29fe2011-06-24 21:55:10 +00001710 }
1711 }
1712 type = vat->getElementType();
1713 break;
Anders Carlsson8a01b792008-12-20 20:46:34 +00001714 }
Mike Stump11289f42009-09-09 15:08:12 +00001715
Abramo Bagnara1cd83682012-01-07 10:52:36 +00001716 case Type::FunctionProto:
John McCall23c29fe2011-06-24 21:55:10 +00001717 case Type::FunctionNoProto:
Alp Toker314cc812014-01-25 16:55:45 +00001718 type = cast<FunctionType>(ty)->getReturnType();
John McCall23c29fe2011-06-24 21:55:10 +00001719 break;
Eli Friedman0dfb8892011-10-06 23:00:33 +00001720
Abramo Bagnarafa95ed42012-01-11 08:19:46 +00001721 case Type::Paren:
1722 case Type::TypeOf:
1723 case Type::UnaryTransform:
1724 case Type::Attributed:
1725 case Type::SubstTemplateTypeParm:
David Blaikie66ed89d2013-07-13 21:08:08 +00001726 case Type::PackExpansion:
Abramo Bagnarafa95ed42012-01-11 08:19:46 +00001727 // Keep walking after single level desugaring.
1728 type = type.getSingleStepDesugaredType(getContext());
1729 break;
1730
1731 case Type::Typedef:
1732 case Type::Decltype:
1733 case Type::Auto:
1734 // Stop walking: nothing to do.
1735 return;
1736
1737 case Type::TypeOfExpr:
1738 // Stop walking: emit typeof expression.
1739 EmitIgnoredExpr(cast<TypeOfExprType>(ty)->getUnderlyingExpr());
1740 return;
1741
Eli Friedman0dfb8892011-10-06 23:00:33 +00001742 case Type::Atomic:
1743 type = cast<AtomicType>(ty)->getValueType();
1744 break;
Xiuli Pan9c14e282016-01-09 12:53:17 +00001745
1746 case Type::Pipe:
1747 type = cast<PipeType>(ty)->getElementType();
1748 break;
John McCall23c29fe2011-06-24 21:55:10 +00001749 }
1750 } while (type->isVariablyModifiedType());
Anders Carlssonccbe9202008-12-12 07:19:02 +00001751}
Eli Friedmanddea0ad2009-01-20 17:46:04 +00001752
John McCall7f416cc2015-09-08 08:05:57 +00001753Address CodeGenFunction::EmitVAListRef(const Expr* E) {
Dan Gohmane9e32dc2010-10-29 22:47:07 +00001754 if (getContext().getBuiltinVaListType()->isArrayType())
John McCall7f416cc2015-09-08 08:05:57 +00001755 return EmitPointerWithAlignment(E);
Eli Friedmanddea0ad2009-01-20 17:46:04 +00001756 return EmitLValue(E).getAddress();
1757}
Anders Carlsson15cb75a2009-02-07 22:53:43 +00001758
Charles Davisc7d5c942015-09-17 20:55:33 +00001759Address CodeGenFunction::EmitMSVAListRef(const Expr *E) {
1760 return EmitLValue(E).getAddress();
1761}
1762
Yunzhong Gao0ebf1bb2013-08-30 08:53:09 +00001763void CodeGenFunction::EmitDeclRefExprDbgValue(const DeclRefExpr *E,
1764 llvm::Constant *Init) {
Devang Pateldc866e12010-08-10 17:53:33 +00001765 assert (Init && "Invalid DeclRefExpr initializer!");
Yunzhong Gao0ebf1bb2013-08-30 08:53:09 +00001766 if (CGDebugInfo *Dbg = getDebugInfo())
1767 if (CGM.getCodeGenOpts().getDebugInfo() >= CodeGenOptions::LimitedDebugInfo)
1768 Dbg->EmitGlobalVariable(E->getDecl(), Init);
Devang Patele03edfd2010-08-10 07:24:25 +00001769}
John McCallc07a0c72011-02-17 10:25:35 +00001770
1771CodeGenFunction::PeepholeProtection
1772CodeGenFunction::protectFromPeepholes(RValue rvalue) {
1773 // At the moment, the only aggressive peephole we do in IR gen
1774 // is trunc(zext) folding, but if we add more, we can easily
1775 // extend this protection.
1776
1777 if (!rvalue.isScalar()) return PeepholeProtection();
1778 llvm::Value *value = rvalue.getScalarVal();
1779 if (!isa<llvm::ZExtInst>(value)) return PeepholeProtection();
1780
1781 // Just make an extra bitcast.
1782 assert(HaveInsertPoint());
1783 llvm::Instruction *inst = new llvm::BitCastInst(value, value->getType(), "",
1784 Builder.GetInsertBlock());
1785
1786 PeepholeProtection protection;
1787 protection.Inst = inst;
1788 return protection;
1789}
1790
1791void CodeGenFunction::unprotectFromPeepholes(PeepholeProtection protection) {
1792 if (!protection.Inst) return;
1793
1794 // In theory, we could try to duplicate the peepholes now, but whatever.
1795 protection.Inst->eraseFromParent();
1796}
Julien Lerouge5a6b6982011-09-09 22:41:49 +00001797
1798llvm::Value *CodeGenFunction::EmitAnnotationCall(llvm::Value *AnnotationFn,
1799 llvm::Value *AnnotatedVal,
Dmitri Gribenkof8579502013-01-12 19:30:44 +00001800 StringRef AnnotationStr,
Julien Lerouge5a6b6982011-09-09 22:41:49 +00001801 SourceLocation Location) {
1802 llvm::Value *Args[4] = {
1803 AnnotatedVal,
1804 Builder.CreateBitCast(CGM.EmitAnnotationString(AnnotationStr), Int8PtrTy),
1805 Builder.CreateBitCast(CGM.EmitAnnotationUnit(Location), Int8PtrTy),
1806 CGM.EmitAnnotationLineNo(Location)
1807 };
1808 return Builder.CreateCall(AnnotationFn, Args);
1809}
1810
1811void CodeGenFunction::EmitVarAnnotations(const VarDecl *D, llvm::Value *V) {
1812 assert(D->hasAttr<AnnotateAttr>() && "no annotate attribute");
1813 // FIXME We create a new bitcast for every annotation because that's what
1814 // llvm-gcc was doing.
Aaron Ballmanbe22bcb2014-03-10 17:08:28 +00001815 for (const auto *I : D->specific_attrs<AnnotateAttr>())
Julien Lerouge5a6b6982011-09-09 22:41:49 +00001816 EmitAnnotationCall(CGM.getIntrinsic(llvm::Intrinsic::var_annotation),
1817 Builder.CreateBitCast(V, CGM.Int8PtrTy, V->getName()),
Aaron Ballmanbe22bcb2014-03-10 17:08:28 +00001818 I->getAnnotation(), D->getLocation());
Julien Lerouge5a6b6982011-09-09 22:41:49 +00001819}
1820
John McCall7f416cc2015-09-08 08:05:57 +00001821Address CodeGenFunction::EmitFieldAnnotations(const FieldDecl *D,
1822 Address Addr) {
Julien Lerouge5a6b6982011-09-09 22:41:49 +00001823 assert(D->hasAttr<AnnotateAttr>() && "no annotate attribute");
John McCall7f416cc2015-09-08 08:05:57 +00001824 llvm::Value *V = Addr.getPointer();
Julien Lerouge5a6b6982011-09-09 22:41:49 +00001825 llvm::Type *VTy = V->getType();
1826 llvm::Value *F = CGM.getIntrinsic(llvm::Intrinsic::ptr_annotation,
1827 CGM.Int8PtrTy);
1828
Aaron Ballmanbe22bcb2014-03-10 17:08:28 +00001829 for (const auto *I : D->specific_attrs<AnnotateAttr>()) {
Julien Lerouge5a6b6982011-09-09 22:41:49 +00001830 // FIXME Always emit the cast inst so we can differentiate between
1831 // annotation on the first field of a struct and annotation on the struct
1832 // itself.
1833 if (VTy != CGM.Int8PtrTy)
1834 V = Builder.Insert(new llvm::BitCastInst(V, CGM.Int8PtrTy));
Aaron Ballmanbe22bcb2014-03-10 17:08:28 +00001835 V = EmitAnnotationCall(F, V, I->getAnnotation(), D->getLocation());
Julien Lerouge5a6b6982011-09-09 22:41:49 +00001836 V = Builder.CreateBitCast(V, VTy);
1837 }
1838
John McCall7f416cc2015-09-08 08:05:57 +00001839 return Address(V, Addr.getAlignment());
Julien Lerouge5a6b6982011-09-09 22:41:49 +00001840}
Ben Langmuir3b4c30b2013-05-09 19:17:11 +00001841
Angel Garcia Gomez637d1e62015-10-20 13:23:58 +00001842CodeGenFunction::CGCapturedStmtInfo::~CGCapturedStmtInfo() { }
Alexander Musman515ad8c2014-05-22 08:54:05 +00001843
Alexey Samsonov24cad992014-07-17 18:46:27 +00001844CodeGenFunction::SanitizerScope::SanitizerScope(CodeGenFunction *CGF)
1845 : CGF(CGF) {
1846 assert(!CGF->IsSanitizerScope);
1847 CGF->IsSanitizerScope = true;
1848}
1849
1850CodeGenFunction::SanitizerScope::~SanitizerScope() {
1851 CGF->IsSanitizerScope = false;
1852}
1853
Alexander Musman515ad8c2014-05-22 08:54:05 +00001854void CodeGenFunction::InsertHelper(llvm::Instruction *I,
1855 const llvm::Twine &Name,
1856 llvm::BasicBlock *BB,
1857 llvm::BasicBlock::iterator InsertPt) const {
1858 LoopStack.InsertHelper(I);
Kostya Serebryany4ee69042014-08-26 02:29:59 +00001859 if (IsSanitizerScope)
1860 CGM.getSanitizerMetadata()->disableSanitizerForInstruction(I);
Alexander Musman515ad8c2014-05-22 08:54:05 +00001861}
1862
1863template <bool PreserveNames>
1864void CGBuilderInserter<PreserveNames>::InsertHelper(
1865 llvm::Instruction *I, const llvm::Twine &Name, llvm::BasicBlock *BB,
1866 llvm::BasicBlock::iterator InsertPt) const {
1867 llvm::IRBuilderDefaultInserter<PreserveNames>::InsertHelper(I, Name, BB,
1868 InsertPt);
1869 if (CGF)
1870 CGF->InsertHelper(I, Name, BB, InsertPt);
1871}
1872
1873#ifdef NDEBUG
1874#define PreserveNames false
1875#else
1876#define PreserveNames true
1877#endif
1878template void CGBuilderInserter<PreserveNames>::InsertHelper(
1879 llvm::Instruction *I, const llvm::Twine &Name, llvm::BasicBlock *BB,
1880 llvm::BasicBlock::iterator InsertPt) const;
1881#undef PreserveNames
Eric Christopherfbfd97e2015-11-12 00:44:07 +00001882
David Blaikie5df253382015-11-12 01:09:58 +00001883static bool hasRequiredFeatures(const SmallVectorImpl<StringRef> &ReqFeatures,
Eric Christopherce836772015-11-14 02:38:37 +00001884 CodeGenModule &CGM, const FunctionDecl *FD,
1885 std::string &FirstMissing) {
David Blaikie5df253382015-11-12 01:09:58 +00001886 // If there aren't any required features listed then go ahead and return.
1887 if (ReqFeatures.empty())
1888 return false;
1889
1890 // Now build up the set of caller features and verify that all the required
1891 // features are there.
1892 llvm::StringMap<bool> CallerFeatureMap;
1893 CGM.getFunctionFeatureMap(CallerFeatureMap, FD);
1894
1895 // If we have at least one of the features in the feature list return
1896 // true, otherwise return false.
1897 return std::all_of(
1898 ReqFeatures.begin(), ReqFeatures.end(), [&](StringRef Feature) {
1899 SmallVector<StringRef, 1> OrFeatures;
1900 Feature.split(OrFeatures, "|");
1901 return std::any_of(OrFeatures.begin(), OrFeatures.end(),
1902 [&](StringRef Feature) {
Eric Christopherce836772015-11-14 02:38:37 +00001903 if (!CallerFeatureMap.lookup(Feature)) {
1904 FirstMissing = Feature.str();
1905 return false;
1906 }
1907 return true;
David Blaikie5df253382015-11-12 01:09:58 +00001908 });
1909 });
1910}
1911
Eric Christopher2b2d56f2015-11-12 00:44:12 +00001912// Emits an error if we don't have a valid set of target features for the
1913// called function.
Eric Christopherfbfd97e2015-11-12 00:44:07 +00001914void CodeGenFunction::checkTargetFeatures(const CallExpr *E,
1915 const FunctionDecl *TargetDecl) {
1916 // Early exit if this is an indirect call.
1917 if (!TargetDecl)
1918 return;
1919
1920 // Get the current enclosing function if it exists. If it doesn't
1921 // we can't check the target features anyhow.
1922 const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(CurFuncDecl);
1923 if (!FD)
1924 return;
1925
Eric Christopher2b2d56f2015-11-12 00:44:12 +00001926 // Grab the required features for the call. For a builtin this is listed in
1927 // the td file with the default cpu, for an always_inline function this is any
1928 // listed cpu and any listed features.
Eric Christopherfbfd97e2015-11-12 00:44:07 +00001929 unsigned BuiltinID = TargetDecl->getBuiltinID();
Eric Christopherce836772015-11-14 02:38:37 +00001930 std::string MissingFeature;
Eric Christopher2b2d56f2015-11-12 00:44:12 +00001931 if (BuiltinID) {
1932 SmallVector<StringRef, 1> ReqFeatures;
1933 const char *FeatureList =
1934 CGM.getContext().BuiltinInfo.getRequiredFeatures(BuiltinID);
1935 // Return if the builtin doesn't have any required features.
1936 if (!FeatureList || StringRef(FeatureList) == "")
1937 return;
1938 StringRef(FeatureList).split(ReqFeatures, ",");
Eric Christopherce836772015-11-14 02:38:37 +00001939 if (!hasRequiredFeatures(ReqFeatures, CGM, FD, MissingFeature))
Eric Christopher2b2d56f2015-11-12 00:44:12 +00001940 CGM.getDiags().Report(E->getLocStart(), diag::err_builtin_needs_feature)
1941 << TargetDecl->getDeclName()
1942 << CGM.getContext().BuiltinInfo.getRequiredFeatures(BuiltinID);
1943
1944 } else if (TargetDecl->hasAttr<TargetAttr>()) {
1945 // Get the required features for the callee.
1946 SmallVector<StringRef, 1> ReqFeatures;
1947 llvm::StringMap<bool> CalleeFeatureMap;
1948 CGM.getFunctionFeatureMap(CalleeFeatureMap, TargetDecl);
Eric Christopherb7bbc532015-11-16 18:29:59 +00001949 for (const auto &F : CalleeFeatureMap) {
1950 // Only positive features are "required".
1951 if (F.getValue())
1952 ReqFeatures.push_back(F.getKey());
1953 }
Eric Christopherce836772015-11-14 02:38:37 +00001954 if (!hasRequiredFeatures(ReqFeatures, CGM, FD, MissingFeature))
Eric Christopher2b2d56f2015-11-12 00:44:12 +00001955 CGM.getDiags().Report(E->getLocStart(), diag::err_function_needs_feature)
Eric Christopherce836772015-11-14 02:38:37 +00001956 << FD->getDeclName() << TargetDecl->getDeclName() << MissingFeature;
Eric Christopher2b2d56f2015-11-12 00:44:12 +00001957 }
Eric Christopherfbfd97e2015-11-12 00:44:07 +00001958}