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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"
Peter Collingbournefa4d6032011-10-06 18:51:56 +000015#include "CGCUDARuntime.h"
John McCall5d865c322010-08-31 07:33:07 +000016#include "CGCXXABI.h"
Eli Friedman17630752008-05-22 01:40:10 +000017#include "CGDebugInfo.h"
Alexey Bataev9959db52014-05-06 10:08:46 +000018#include "CGOpenMPRuntime.h"
Chandler Carruth3a022472012-12-04 09:13:33 +000019#include "CodeGenModule.h"
Justin Bogneref512b92014-01-06 22:27:43 +000020#include "CodeGenPGO.h"
Peter Collingbourneb453cd62013-10-20 21:29:19 +000021#include "TargetInfo.h"
Daniel Dunbarad319a72008-08-11 05:00:27 +000022#include "clang/AST/ASTContext.h"
Daniel Dunbar6e8aa532008-08-11 05:35:13 +000023#include "clang/AST/Decl.h"
Anders Carlsson468fa632009-04-04 20:47:02 +000024#include "clang/AST/DeclCXX.h"
Mike Stumpbee78dd2009-12-04 23:26:17 +000025#include "clang/AST/StmtCXX.h"
Chandler Carruth3a022472012-12-04 09:13:33 +000026#include "clang/Basic/TargetInfo.h"
Mark Laceya8e7df32013-10-30 21:53:58 +000027#include "clang/CodeGen/CGFunctionInfo.h"
Chris Lattner3c77a352010-06-22 00:03:40 +000028#include "clang/Frontend/CodeGenOptions.h"
Chandler Carruthffd55512013-01-02 11:45:17 +000029#include "llvm/IR/DataLayout.h"
30#include "llvm/IR/Intrinsics.h"
31#include "llvm/IR/MDBuilder.h"
32#include "llvm/IR/Operator.h"
Chris Lattnerbed31442007-05-28 01:07:47 +000033using namespace clang;
34using namespace CodeGen;
35
Fariborz Jahanian63628032012-06-26 16:06:38 +000036CodeGenFunction::CodeGenFunction(CodeGenModule &cgm, bool suppressNewContext)
David Blaikie92848de2013-08-26 20:33:21 +000037 : CodeGenTypeCache(cgm), CGM(cgm), Target(cgm.getTarget()),
38 Builder(cgm.getModule().getContext()), CapturedStmtInfo(0),
39 SanitizePerformTypeCheck(CGM.getSanOpts().Null |
40 CGM.getSanOpts().Alignment |
41 CGM.getSanOpts().ObjectSize |
42 CGM.getSanOpts().Vptr),
43 SanOpts(&CGM.getSanOpts()), AutoreleaseResult(false), BlockInfo(0),
44 BlockPointer(0), LambdaThisCaptureField(0), NormalCleanupDest(0),
45 NextCleanupDestIndex(1), FirstBlockInfo(0), EHResumeBlock(0),
46 ExceptionSlot(0), EHSelectorSlot(0), DebugInfo(CGM.getModuleDebugInfo()),
47 DisableDebugInfo(false), DidCallStackSave(false), IndirectBranch(0),
Justin Bogneref512b92014-01-06 22:27:43 +000048 PGO(cgm), SwitchInsn(0), SwitchWeights(0),
49 CaseRangeBlock(0), UnreachableBlock(0), NumReturnExprs(0),
David Blaikie92848de2013-08-26 20:33:21 +000050 NumSimpleReturnExprs(0), CXXABIThisDecl(0), CXXABIThisValue(0),
51 CXXThisValue(0), CXXDefaultInitExprThis(0),
52 CXXStructorImplicitParamDecl(0), CXXStructorImplicitParamValue(0),
53 OutermostConditional(0), CurLexicalScope(0), TerminateLandingPad(0),
54 TerminateHandler(0), TrapBB(0) {
Fariborz Jahanian63628032012-06-26 16:06:38 +000055 if (!suppressNewContext)
56 CGM.getCXXABI().getMangleContext().startNewFunction();
Michael Ilseman7a167ee2012-12-04 00:36:06 +000057
58 llvm::FastMathFlags FMF;
59 if (CGM.getLangOpts().FastMath)
Benjamin Kramer7464efc2012-12-09 21:58:24 +000060 FMF.setUnsafeAlgebra();
Michael Ilseman7a167ee2012-12-04 00:36:06 +000061 if (CGM.getLangOpts().FiniteMathOnly) {
Benjamin Kramer7464efc2012-12-09 21:58:24 +000062 FMF.setNoNaNs();
63 FMF.setNoInfs();
Michael Ilseman7a167ee2012-12-04 00:36:06 +000064 }
65 Builder.SetFastMathFlags(FMF);
Chris Lattner5696e7b2008-06-17 18:05:57 +000066}
Chris Lattnerd1af2d22007-05-29 23:17:50 +000067
John McCall08ef4662011-11-10 08:15:53 +000068CodeGenFunction::~CodeGenFunction() {
Richard Smith736a9472013-06-12 20:42:33 +000069 assert(LifetimeExtendedCleanupStack.empty() && "failed to emit a cleanup");
70
John McCall08ef4662011-11-10 08:15:53 +000071 // If there are any unclaimed block infos, go ahead and destroy them
72 // now. This can happen if IR-gen gets clever and skips evaluating
73 // something.
74 if (FirstBlockInfo)
75 destroyBlockInfos(FirstBlockInfo);
Alexey Bataev9959db52014-05-06 10:08:46 +000076
77 if (getLangOpts().OpenMP) {
78 CGM.getOpenMPRuntime().FunctionFinished(*this);
79 }
John McCall08ef4662011-11-10 08:15:53 +000080}
81
Chris Lattnerd1af2d22007-05-29 23:17:50 +000082
Chris Lattnera5f58b02011-07-09 17:41:47 +000083llvm::Type *CodeGenFunction::ConvertTypeForMem(QualType T) {
Daniel Dunbaree3da872009-02-03 23:03:55 +000084 return CGM.getTypes().ConvertTypeForMem(T);
85}
86
Chris Lattnera5f58b02011-07-09 17:41:47 +000087llvm::Type *CodeGenFunction::ConvertType(QualType T) {
Chris Lattnerf033c142007-06-22 19:05:19 +000088 return CGM.getTypes().ConvertType(T);
Chris Lattner45bb9142007-06-09 02:28:57 +000089}
Chris Lattnerd1af2d22007-05-29 23:17:50 +000090
John McCall47fb9502013-03-07 21:37:08 +000091TypeEvaluationKind CodeGenFunction::getEvaluationKind(QualType type) {
92 type = type.getCanonicalType();
93 while (true) {
94 switch (type->getTypeClass()) {
John McCall745ae282011-05-15 02:34:36 +000095#define TYPE(name, parent)
96#define ABSTRACT_TYPE(name, parent)
97#define NON_CANONICAL_TYPE(name, parent) case Type::name:
98#define DEPENDENT_TYPE(name, parent) case Type::name:
99#define NON_CANONICAL_UNLESS_DEPENDENT_TYPE(name, parent) case Type::name:
100#include "clang/AST/TypeNodes.def"
John McCall47fb9502013-03-07 21:37:08 +0000101 llvm_unreachable("non-canonical or dependent type in IR-generation");
John McCall745ae282011-05-15 02:34:36 +0000102
Richard Smith27d807c2013-04-30 13:56:41 +0000103 case Type::Auto:
104 llvm_unreachable("undeduced auto type in IR-generation");
105
John McCall47fb9502013-03-07 21:37:08 +0000106 // Various scalar types.
107 case Type::Builtin:
108 case Type::Pointer:
109 case Type::BlockPointer:
110 case Type::LValueReference:
111 case Type::RValueReference:
112 case Type::MemberPointer:
113 case Type::Vector:
114 case Type::ExtVector:
115 case Type::FunctionProto:
116 case Type::FunctionNoProto:
117 case Type::Enum:
118 case Type::ObjCObjectPointer:
119 return TEK_Scalar;
John McCall745ae282011-05-15 02:34:36 +0000120
John McCall47fb9502013-03-07 21:37:08 +0000121 // Complexes.
122 case Type::Complex:
123 return TEK_Complex;
Eli Friedman0dfb8892011-10-06 23:00:33 +0000124
John McCall47fb9502013-03-07 21:37:08 +0000125 // Arrays, records, and Objective-C objects.
126 case Type::ConstantArray:
127 case Type::IncompleteArray:
128 case Type::VariableArray:
129 case Type::Record:
130 case Type::ObjCObject:
131 case Type::ObjCInterface:
132 return TEK_Aggregate;
133
134 // We operate on atomic values according to their underlying type.
135 case Type::Atomic:
136 type = cast<AtomicType>(type)->getValueType();
137 continue;
138 }
139 llvm_unreachable("unknown type kind!");
John McCall745ae282011-05-15 02:34:36 +0000140 }
Chris Lattner54fb19e2007-06-22 22:02:34 +0000141}
142
David Blaikie357aafb2013-02-01 19:09:49 +0000143void CodeGenFunction::EmitReturnBlock() {
Daniel Dunbarfd346a32009-01-26 23:27:52 +0000144 // For cleanliness, we try to avoid emitting the return block for
145 // simple cases.
146 llvm::BasicBlock *CurBB = Builder.GetInsertBlock();
147
148 if (CurBB) {
149 assert(!CurBB->getTerminator() && "Unexpected terminated block.");
150
Daniel Dunbarea3060a2009-07-19 08:24:34 +0000151 // We have a valid insert point, reuse it if it is empty or there are no
152 // explicit jumps to the return block.
John McCallad5d61e2010-07-23 21:56:41 +0000153 if (CurBB->empty() || ReturnBlock.getBlock()->use_empty()) {
154 ReturnBlock.getBlock()->replaceAllUsesWith(CurBB);
155 delete ReturnBlock.getBlock();
Daniel Dunbarea3060a2009-07-19 08:24:34 +0000156 } else
John McCallad5d61e2010-07-23 21:56:41 +0000157 EmitBlock(ReturnBlock.getBlock());
David Blaikie357aafb2013-02-01 19:09:49 +0000158 return;
Daniel Dunbarfd346a32009-01-26 23:27:52 +0000159 }
160
161 // Otherwise, if the return block is the target of a single direct
162 // branch then we can just put the code in that block instead. This
163 // cleans up functions which started with a unified return block.
John McCallad5d61e2010-07-23 21:56:41 +0000164 if (ReturnBlock.getBlock()->hasOneUse()) {
Mike Stump11289f42009-09-09 15:08:12 +0000165 llvm::BranchInst *BI =
Chandler Carruth4d01fff2014-03-09 03:16:50 +0000166 dyn_cast<llvm::BranchInst>(*ReturnBlock.getBlock()->user_begin());
John McCallbd309292010-07-06 01:34:17 +0000167 if (BI && BI->isUnconditional() &&
John McCallad5d61e2010-07-23 21:56:41 +0000168 BI->getSuccessor(0) == ReturnBlock.getBlock()) {
David Blaikie1d969f42013-02-23 19:20:56 +0000169 // Reset insertion point, including debug location, and delete the
170 // branch. This is really subtle and only works because the next change
171 // in location will hit the caching in CGDebugInfo::EmitLocation and not
172 // override this.
Eric Christopher65c5c912011-09-09 21:53:04 +0000173 Builder.SetCurrentDebugLocation(BI->getDebugLoc());
Daniel Dunbarfd346a32009-01-26 23:27:52 +0000174 Builder.SetInsertPoint(BI->getParent());
175 BI->eraseFromParent();
John McCallad5d61e2010-07-23 21:56:41 +0000176 delete ReturnBlock.getBlock();
David Blaikie357aafb2013-02-01 19:09:49 +0000177 return;
Daniel Dunbarfd346a32009-01-26 23:27:52 +0000178 }
179 }
180
Mike Stump18bb9282009-05-16 07:57:57 +0000181 // FIXME: We are at an unreachable point, there is no reason to emit the block
182 // unless it has uses. However, we still need a place to put the debug
183 // region.end for now.
Daniel Dunbarfd346a32009-01-26 23:27:52 +0000184
John McCallad5d61e2010-07-23 21:56:41 +0000185 EmitBlock(ReturnBlock.getBlock());
John McCallbd309292010-07-06 01:34:17 +0000186}
187
188static void EmitIfUsed(CodeGenFunction &CGF, llvm::BasicBlock *BB) {
189 if (!BB) return;
190 if (!BB->use_empty())
191 return CGF.CurFn->getBasicBlockList().push_back(BB);
192 delete BB;
Daniel Dunbarfd346a32009-01-26 23:27:52 +0000193}
194
Daniel Dunbar89654ee2008-08-26 08:29:31 +0000195void CodeGenFunction::FinishFunction(SourceLocation EndLoc) {
Chris Lattnere73e4322007-07-16 21:28:45 +0000196 assert(BreakContinueStack.empty() &&
197 "mismatched push/pop in break/continue stack!");
Mike Stump11289f42009-09-09 15:08:12 +0000198
Adrian Prantl52bf3c42013-05-03 20:11:48 +0000199 bool OnlySimpleReturnStmts = NumSimpleReturnExprs > 0
Adrian Prantl524ba1f2013-07-25 00:23:42 +0000200 && NumSimpleReturnExprs == NumReturnExprs
201 && ReturnBlock.getBlock()->use_empty();
202 // Usually the return expression is evaluated before the cleanup
203 // code. If the function contains only a simple return statement,
204 // such as a constant, the location before the cleanup code becomes
205 // the last useful breakpoint in the function, because the simple
206 // return expression will be evaluated after the cleanup code. To be
207 // safe, set the debug location for cleanup code to the location of
208 // the return statement. Otherwise the cleanup code should be at the
209 // end of the function's lexical scope.
210 //
211 // If there are multiple branches to the return block, the branch
212 // instructions will get the location of the return statements and
213 // all will be fine.
Adrian Prantl3be10542013-05-02 17:30:20 +0000214 if (CGDebugInfo *DI = getDebugInfo()) {
Adrian Prantl52bf3c42013-05-03 20:11:48 +0000215 if (OnlySimpleReturnStmts)
Adrian Prantle83b1302014-01-07 22:05:52 +0000216 DI->EmitLocation(Builder, LastStopPoint);
Adrian Prantl3be10542013-05-02 17:30:20 +0000217 else
Adrian Prantle83b1302014-01-07 22:05:52 +0000218 DI->EmitLocation(Builder, EndLoc);
Adrian Prantl3be10542013-05-02 17:30:20 +0000219 }
David Blaikie357aafb2013-02-01 19:09:49 +0000220
John McCall31168b02011-06-15 23:02:42 +0000221 // Pop any cleanups that might have been associated with the
222 // parameters. Do this in whatever block we're currently in; it's
223 // important to do this before we enter the return block or return
224 // edges will be *really* confused.
Adrian Prantl3be10542013-05-02 17:30:20 +0000225 bool EmitRetDbgLoc = true;
226 if (EHStack.stable_begin() != PrologueCleanupDepth) {
Adrian Prantldc237b52013-05-16 00:41:26 +0000227 PopCleanupBlocks(PrologueCleanupDepth);
John McCall31168b02011-06-15 23:02:42 +0000228
Adrian Prantl3be10542013-05-02 17:30:20 +0000229 // Make sure the line table doesn't jump back into the body for
230 // the ret after it's been at EndLoc.
231 EmitRetDbgLoc = false;
232
233 if (CGDebugInfo *DI = getDebugInfo())
Adrian Prantl52bf3c42013-05-03 20:11:48 +0000234 if (OnlySimpleReturnStmts)
Adrian Prantle83b1302014-01-07 22:05:52 +0000235 DI->EmitLocation(Builder, EndLoc);
Adrian Prantl3be10542013-05-02 17:30:20 +0000236 }
237
Mike Stump11289f42009-09-09 15:08:12 +0000238 // Emit function epilog (to return).
David Blaikie357aafb2013-02-01 19:09:49 +0000239 EmitReturnBlock();
Daniel Dunbarfab3f932008-11-11 20:59:54 +0000240
Daniel Dunbar468a8f82011-02-10 17:32:22 +0000241 if (ShouldInstrumentFunction())
242 EmitFunctionInstrumentation("__cyg_profile_func_exit");
Chris Lattner3c77a352010-06-22 00:03:40 +0000243
Daniel Dunbarfab3f932008-11-11 20:59:54 +0000244 // Emit debug descriptor for function end.
Anders Carlsson63784f42009-02-13 08:11:52 +0000245 if (CGDebugInfo *DI = getDebugInfo()) {
Devang Patel0884a602010-07-22 22:29:16 +0000246 DI->EmitFunctionEnd(Builder);
Daniel Dunbarfab3f932008-11-11 20:59:54 +0000247 }
248
Nick Lewycky2d84e842013-10-02 02:29:49 +0000249 EmitFunctionEpilog(*CurFnInfo, EmitRetDbgLoc, EndLoc);
Mike Stump1d849212009-12-07 23:38:24 +0000250 EmitEndEHSpec(CurCodeDecl);
Daniel Dunbar54bb1932008-09-09 21:00:17 +0000251
John McCallbd309292010-07-06 01:34:17 +0000252 assert(EHStack.empty() &&
253 "did not remove all scopes from cleanup stack!");
254
Chris Lattner6c4d2552009-10-28 23:59:40 +0000255 // If someone did an indirect goto, emit the indirect goto block at the end of
256 // the function.
257 if (IndirectBranch) {
258 EmitBlock(IndirectBranch->getParent());
259 Builder.ClearInsertionPoint();
260 }
Michael Ilseman686240a2012-12-04 00:29:55 +0000261
Chris Lattnerc48023b2007-12-02 06:32:24 +0000262 // Remove the AllocaInsertPt instruction, which is just a convenience for us.
Chris Lattner2739d2b2009-03-31 22:17:44 +0000263 llvm::Instruction *Ptr = AllocaInsertPt;
Chris Lattnerc48023b2007-12-02 06:32:24 +0000264 AllocaInsertPt = 0;
Chris Lattner2739d2b2009-03-31 22:17:44 +0000265 Ptr->eraseFromParent();
Michael Ilseman686240a2012-12-04 00:29:55 +0000266
Chris Lattner6c4d2552009-10-28 23:59:40 +0000267 // If someone took the address of a label but never did an indirect goto, we
268 // made a zero entry PHI node, which is illegal, zap it now.
269 if (IndirectBranch) {
270 llvm::PHINode *PN = cast<llvm::PHINode>(IndirectBranch->getAddress());
271 if (PN->getNumIncomingValues() == 0) {
272 PN->replaceAllUsesWith(llvm::UndefValue::get(PN->getType()));
273 PN->eraseFromParent();
274 }
275 }
John McCallbd309292010-07-06 01:34:17 +0000276
John McCall8e4c74b2011-08-11 02:22:43 +0000277 EmitIfUsed(*this, EHResumeBlock);
John McCallbd309292010-07-06 01:34:17 +0000278 EmitIfUsed(*this, TerminateLandingPad);
279 EmitIfUsed(*this, TerminateHandler);
280 EmitIfUsed(*this, UnreachableBlock);
John McCall09ae0322010-07-06 23:57:41 +0000281
282 if (CGM.getCodeGenOpts().EmitDeclMetadata)
283 EmitDeclMetadata();
Reid Kleckner314ef7b2014-02-01 00:04:45 +0000284
285 for (SmallVectorImpl<std::pair<llvm::Instruction *, llvm::Value *> >::iterator
286 I = DeferredReplacements.begin(),
287 E = DeferredReplacements.end();
288 I != E; ++I) {
289 I->first->replaceAllUsesWith(I->second);
290 I->first->eraseFromParent();
291 }
Chris Lattnerd1af2d22007-05-29 23:17:50 +0000292}
Chris Lattner308f4312007-05-29 23:50:05 +0000293
Chris Lattner3c77a352010-06-22 00:03:40 +0000294/// ShouldInstrumentFunction - Return true if the current function should be
295/// instrumented with __cyg_profile_func_* calls
296bool CodeGenFunction::ShouldInstrumentFunction() {
297 if (!CGM.getCodeGenOpts().InstrumentFunctions)
298 return false;
Ted Kremenekc249c412011-05-16 23:49:20 +0000299 if (!CurFuncDecl || CurFuncDecl->hasAttr<NoInstrumentFunctionAttr>())
Chris Lattner3c77a352010-06-22 00:03:40 +0000300 return false;
301 return true;
302}
303
304/// EmitFunctionInstrumentation - Emit LLVM code to call the specified
305/// instrumentation function with the current function and the call site, if
306/// function instrumentation is enabled.
307void CodeGenFunction::EmitFunctionInstrumentation(const char *Fn) {
Chris Lattnerb48a2d52010-06-23 05:21:28 +0000308 // void __cyg_profile_func_{enter,exit} (void *this_fn, void *call_site);
Chris Lattnera5f58b02011-07-09 17:41:47 +0000309 llvm::PointerType *PointerTy = Int8PtrTy;
310 llvm::Type *ProfileFuncArgs[] = { PointerTy, PointerTy };
Chris Lattner2192fe52011-07-18 04:24:23 +0000311 llvm::FunctionType *FunctionTy =
Chris Lattnerece04092012-02-07 00:39:47 +0000312 llvm::FunctionType::get(VoidTy, ProfileFuncArgs, false);
Chris Lattner3c77a352010-06-22 00:03:40 +0000313
314 llvm::Constant *F = CGM.CreateRuntimeFunction(FunctionTy, Fn);
315 llvm::CallInst *CallSite = Builder.CreateCall(
Benjamin Kramer8d375ce2011-07-14 17:45:50 +0000316 CGM.getIntrinsic(llvm::Intrinsic::returnaddress),
Chris Lattner5e016ae2010-06-27 07:15:29 +0000317 llvm::ConstantInt::get(Int32Ty, 0),
Chris Lattner3c77a352010-06-22 00:03:40 +0000318 "callsite");
319
John McCall882987f2013-02-28 19:01:20 +0000320 llvm::Value *args[] = {
321 llvm::ConstantExpr::getBitCast(CurFn, PointerTy),
322 CallSite
323 };
324
325 EmitNounwindRuntimeCall(F, args);
Chris Lattner3c77a352010-06-22 00:03:40 +0000326}
327
Roman Divacky178e01602011-02-10 16:52:03 +0000328void CodeGenFunction::EmitMCountInstrumentation() {
Chris Lattnerece04092012-02-07 00:39:47 +0000329 llvm::FunctionType *FTy = llvm::FunctionType::get(VoidTy, false);
Roman Divacky178e01602011-02-10 16:52:03 +0000330
John McCallc8e01702013-04-16 22:48:15 +0000331 llvm::Constant *MCountFn =
332 CGM.CreateRuntimeFunction(FTy, getTarget().getMCountName());
John McCall882987f2013-02-28 19:01:20 +0000333 EmitNounwindRuntimeCall(MCountFn);
Roman Divacky178e01602011-02-10 16:52:03 +0000334}
335
Tanya Lattner7445ada2012-07-11 23:02:10 +0000336// OpenCL v1.2 s5.6.4.6 allows the compiler to store kernel argument
337// information in the program executable. The argument information stored
338// includes the argument name, its type, the address and access qualifiers used.
Tanya Lattner7445ada2012-07-11 23:02:10 +0000339static void GenOpenCLArgMetadata(const FunctionDecl *FD, llvm::Function *Fn,
340 CodeGenModule &CGM,llvm::LLVMContext &Context,
Guy Benyeifb36ede2013-03-24 13:58:12 +0000341 SmallVector <llvm::Value*, 5> &kernelMDArgs,
342 CGBuilderTy& Builder, ASTContext &ASTCtx) {
343 // Create MDNodes that represent the kernel arg metadata.
Tanya Lattner7445ada2012-07-11 23:02:10 +0000344 // Each MDNode is a list in the form of "key", N number of values which is
345 // the same number of values as their are kernel arguments.
Michael Ilseman686240a2012-12-04 00:29:55 +0000346
Joey Gouly92a47442014-04-04 13:43:57 +0000347 const PrintingPolicy &Policy = ASTCtx.getPrintingPolicy();
348
Guy Benyeifb36ede2013-03-24 13:58:12 +0000349 // MDNode for the kernel argument address space qualifiers.
350 SmallVector<llvm::Value*, 8> addressQuals;
351 addressQuals.push_back(llvm::MDString::get(Context, "kernel_arg_addr_space"));
352
353 // MDNode for the kernel argument access qualifiers (images only).
354 SmallVector<llvm::Value*, 8> accessQuals;
355 accessQuals.push_back(llvm::MDString::get(Context, "kernel_arg_access_qual"));
356
357 // MDNode for the kernel argument type names.
358 SmallVector<llvm::Value*, 8> argTypeNames;
359 argTypeNames.push_back(llvm::MDString::get(Context, "kernel_arg_type"));
360
361 // MDNode for the kernel argument type qualifiers.
362 SmallVector<llvm::Value*, 8> argTypeQuals;
363 argTypeQuals.push_back(llvm::MDString::get(Context, "kernel_arg_type_qual"));
364
Tanya Lattner7445ada2012-07-11 23:02:10 +0000365 // MDNode for the kernel argument names.
366 SmallVector<llvm::Value*, 8> argNames;
367 argNames.push_back(llvm::MDString::get(Context, "kernel_arg_name"));
Michael Ilseman686240a2012-12-04 00:29:55 +0000368
Tanya Lattner7445ada2012-07-11 23:02:10 +0000369 for (unsigned i = 0, e = FD->getNumParams(); i != e; ++i) {
370 const ParmVarDecl *parm = FD->getParamDecl(i);
Guy Benyeifb36ede2013-03-24 13:58:12 +0000371 QualType ty = parm->getType();
372 std::string typeQuals;
373
374 if (ty->isPointerType()) {
375 QualType pointeeTy = ty->getPointeeType();
376
377 // Get address qualifier.
378 addressQuals.push_back(Builder.getInt32(ASTCtx.getTargetAddressSpace(
379 pointeeTy.getAddressSpace())));
380
381 // Get argument type name.
Joey Gouly92a47442014-04-04 13:43:57 +0000382 std::string typeName =
383 pointeeTy.getUnqualifiedType().getAsString(Policy) + "*";
Guy Benyeifb36ede2013-03-24 13:58:12 +0000384
385 // Turn "unsigned type" to "utype"
386 std::string::size_type pos = typeName.find("unsigned");
Benjamin Krameref89ae02013-03-24 16:04:55 +0000387 if (pos != std::string::npos)
388 typeName.erase(pos+1, 8);
Guy Benyeifb36ede2013-03-24 13:58:12 +0000389
390 argTypeNames.push_back(llvm::MDString::get(Context, typeName));
391
392 // Get argument type qualifiers:
393 if (ty.isRestrictQualified())
394 typeQuals = "restrict";
395 if (pointeeTy.isConstQualified() ||
396 (pointeeTy.getAddressSpace() == LangAS::opencl_constant))
Benjamin Krameref89ae02013-03-24 16:04:55 +0000397 typeQuals += typeQuals.empty() ? "const" : " const";
Guy Benyeifb36ede2013-03-24 13:58:12 +0000398 if (pointeeTy.isVolatileQualified())
Benjamin Krameref89ae02013-03-24 16:04:55 +0000399 typeQuals += typeQuals.empty() ? "volatile" : " volatile";
Guy Benyeifb36ede2013-03-24 13:58:12 +0000400 } else {
Pekka Jaaskelainen3587b322014-01-09 13:37:30 +0000401 uint32_t AddrSpc = 0;
402 if (ty->isImageType())
403 AddrSpc =
404 CGM.getContext().getTargetAddressSpace(LangAS::opencl_global);
Bob Wilson95a27b02014-02-17 19:20:59 +0000405
Pekka Jaaskelainen3587b322014-01-09 13:37:30 +0000406 addressQuals.push_back(Builder.getInt32(AddrSpc));
Guy Benyeifb36ede2013-03-24 13:58:12 +0000407
408 // Get argument type name.
Joey Gouly92a47442014-04-04 13:43:57 +0000409 std::string typeName = ty.getUnqualifiedType().getAsString(Policy);
Guy Benyeifb36ede2013-03-24 13:58:12 +0000410
411 // Turn "unsigned type" to "utype"
412 std::string::size_type pos = typeName.find("unsigned");
Benjamin Krameref89ae02013-03-24 16:04:55 +0000413 if (pos != std::string::npos)
414 typeName.erase(pos+1, 8);
Guy Benyeifb36ede2013-03-24 13:58:12 +0000415
416 argTypeNames.push_back(llvm::MDString::get(Context, typeName));
417
418 // Get argument type qualifiers:
419 if (ty.isConstQualified())
420 typeQuals = "const";
421 if (ty.isVolatileQualified())
Benjamin Krameref89ae02013-03-24 16:04:55 +0000422 typeQuals += typeQuals.empty() ? "volatile" : " volatile";
Guy Benyeifb36ede2013-03-24 13:58:12 +0000423 }
Justin Bogner0f066062013-11-22 10:20:40 +0000424
Guy Benyeifb36ede2013-03-24 13:58:12 +0000425 argTypeQuals.push_back(llvm::MDString::get(Context, typeQuals));
426
427 // Get image access qualifier:
428 if (ty->isImageType()) {
Aaron Ballmanc4327992013-12-19 03:09:10 +0000429 const OpenCLImageAccessAttr *A = parm->getAttr<OpenCLImageAccessAttr>();
Aaron Ballman26891332014-01-14 17:41:53 +0000430 if (A && A->isWriteOnly())
Guy Benyeifb36ede2013-03-24 13:58:12 +0000431 accessQuals.push_back(llvm::MDString::get(Context, "write_only"));
432 else
433 accessQuals.push_back(llvm::MDString::get(Context, "read_only"));
Aaron Ballman26891332014-01-14 17:41:53 +0000434 // FIXME: what about read_write?
Guy Benyeifb36ede2013-03-24 13:58:12 +0000435 } else
436 accessQuals.push_back(llvm::MDString::get(Context, "none"));
Michael Ilseman686240a2012-12-04 00:29:55 +0000437
Tanya Lattner7445ada2012-07-11 23:02:10 +0000438 // Get argument name.
439 argNames.push_back(llvm::MDString::get(Context, parm->getName()));
Tanya Lattner7445ada2012-07-11 23:02:10 +0000440 }
Guy Benyeifb36ede2013-03-24 13:58:12 +0000441
442 kernelMDArgs.push_back(llvm::MDNode::get(Context, addressQuals));
443 kernelMDArgs.push_back(llvm::MDNode::get(Context, accessQuals));
444 kernelMDArgs.push_back(llvm::MDNode::get(Context, argTypeNames));
445 kernelMDArgs.push_back(llvm::MDNode::get(Context, argTypeQuals));
Tanya Lattner7445ada2012-07-11 23:02:10 +0000446 kernelMDArgs.push_back(llvm::MDNode::get(Context, argNames));
447}
448
Michael Ilseman686240a2012-12-04 00:29:55 +0000449void CodeGenFunction::EmitOpenCLKernelMetadata(const FunctionDecl *FD,
Tanya Lattnerbcffcdf2012-07-09 22:06:01 +0000450 llvm::Function *Fn)
451{
452 if (!FD->hasAttr<OpenCLKernelAttr>())
453 return;
454
455 llvm::LLVMContext &Context = getLLVMContext();
456
Dmitri Gribenkof8579502013-01-12 19:30:44 +0000457 SmallVector <llvm::Value*, 5> kernelMDArgs;
Tanya Lattnerbcffcdf2012-07-09 22:06:01 +0000458 kernelMDArgs.push_back(Fn);
459
Tanya Lattner7445ada2012-07-11 23:02:10 +0000460 if (CGM.getCodeGenOpts().EmitOpenCLArgMetadata)
Guy Benyeifb36ede2013-03-24 13:58:12 +0000461 GenOpenCLArgMetadata(FD, Fn, CGM, Context, kernelMDArgs,
462 Builder, getContext());
Michael Ilseman686240a2012-12-04 00:29:55 +0000463
Aaron Ballmanc4327992013-12-19 03:09:10 +0000464 if (const VecTypeHintAttr *A = FD->getAttr<VecTypeHintAttr>()) {
465 QualType hintQTy = A->getTypeHint();
Joey Goulyaba589c2013-03-08 09:42:32 +0000466 const ExtVectorType *hintEltQTy = hintQTy->getAs<ExtVectorType>();
467 bool isSignedInteger =
468 hintQTy->isSignedIntegerType() ||
469 (hintEltQTy && hintEltQTy->getElementType()->isSignedIntegerType());
470 llvm::Value *attrMDArgs[] = {
471 llvm::MDString::get(Context, "vec_type_hint"),
Aaron Ballmanc4327992013-12-19 03:09:10 +0000472 llvm::UndefValue::get(CGM.getTypes().ConvertType(A->getTypeHint())),
Joey Goulyaba589c2013-03-08 09:42:32 +0000473 llvm::ConstantInt::get(
474 llvm::IntegerType::get(Context, 32),
475 llvm::APInt(32, (uint64_t)(isSignedInteger ? 1 : 0)))
476 };
477 kernelMDArgs.push_back(llvm::MDNode::get(Context, attrMDArgs));
478 }
479
Aaron Ballmanc4327992013-12-19 03:09:10 +0000480 if (const WorkGroupSizeHintAttr *A = FD->getAttr<WorkGroupSizeHintAttr>()) {
Benjamin Kramerc1b78412012-11-15 16:40:35 +0000481 llvm::Value *attrMDArgs[] = {
482 llvm::MDString::get(Context, "work_group_size_hint"),
Aaron Ballmanc4327992013-12-19 03:09:10 +0000483 Builder.getInt32(A->getXDim()),
484 Builder.getInt32(A->getYDim()),
485 Builder.getInt32(A->getZDim())
Benjamin Kramerc1b78412012-11-15 16:40:35 +0000486 };
Tanya Lattnerbcffcdf2012-07-09 22:06:01 +0000487 kernelMDArgs.push_back(llvm::MDNode::get(Context, attrMDArgs));
488 }
489
Aaron Ballmanc4327992013-12-19 03:09:10 +0000490 if (const ReqdWorkGroupSizeAttr *A = FD->getAttr<ReqdWorkGroupSizeAttr>()) {
Benjamin Kramerc1b78412012-11-15 16:40:35 +0000491 llvm::Value *attrMDArgs[] = {
492 llvm::MDString::get(Context, "reqd_work_group_size"),
Aaron Ballmanc4327992013-12-19 03:09:10 +0000493 Builder.getInt32(A->getXDim()),
494 Builder.getInt32(A->getYDim()),
495 Builder.getInt32(A->getZDim())
Benjamin Kramerc1b78412012-11-15 16:40:35 +0000496 };
Tanya Lattnerbcffcdf2012-07-09 22:06:01 +0000497 kernelMDArgs.push_back(llvm::MDNode::get(Context, attrMDArgs));
498 }
499
500 llvm::MDNode *kernelMDNode = llvm::MDNode::get(Context, kernelMDArgs);
501 llvm::NamedMDNode *OpenCLKernelMetadata =
502 CGM.getModule().getOrInsertNamedMetadata("opencl.kernels");
503 OpenCLKernelMetadata->addOperand(kernelMDNode);
504}
505
Adrian Prantl2cede0f2014-04-29 01:07:59 +0000506/// Determine whether the function F ends with a return stmt.
507static bool endsWithReturn(const Decl* F) {
508 const Stmt *Body = nullptr;
509 if (auto *FD = dyn_cast_or_null<FunctionDecl>(F))
510 Body = FD->getBody();
511 else if (auto *OMD = dyn_cast_or_null<ObjCMethodDecl>(F))
512 Body = OMD->getBody();
513
514 if (auto *CS = dyn_cast_or_null<CompoundStmt>(Body)) {
515 auto LastStmt = CS->body_rbegin();
516 if (LastStmt != CS->body_rend())
517 return isa<ReturnStmt>(*LastStmt);
518 }
519 return false;
520}
521
John McCalldec348f72013-05-03 07:33:41 +0000522void CodeGenFunction::StartFunction(GlobalDecl GD,
523 QualType RetTy,
Daniel Dunbarbc915f42008-09-09 23:14:03 +0000524 llvm::Function *Fn,
John McCalla738c252011-03-09 04:27:21 +0000525 const CGFunctionInfo &FnInfo,
Daniel Dunbar354d2782008-10-18 18:22:23 +0000526 const FunctionArgList &Args,
Adrian Prantl42d71b92014-04-10 23:21:53 +0000527 SourceLocation Loc,
Tilmann Scheller99cc30c2011-03-02 21:36:49 +0000528 SourceLocation StartLoc) {
Anders Carlsson73fcc952009-09-11 00:07:24 +0000529 const Decl *D = GD.getDecl();
Michael Ilseman686240a2012-12-04 00:29:55 +0000530
Anders Carlssonf4478e92009-02-09 20:20:56 +0000531 DidCallStackSave = false;
John McCalldec348f72013-05-03 07:33:41 +0000532 CurCodeDecl = D;
533 CurFuncDecl = (D ? D->getNonClosureContext() : 0);
Daniel Dunbarbc915f42008-09-09 23:14:03 +0000534 FnRetTy = RetTy;
Daniel Dunbar9c426522008-07-29 23:18:29 +0000535 CurFn = Fn;
John McCalla738c252011-03-09 04:27:21 +0000536 CurFnInfo = &FnInfo;
Chris Lattner5696e7b2008-06-17 18:05:57 +0000537 assert(CurFn->isDeclaration() && "Function already has body?");
538
Will Dietzf54319c2013-01-18 11:30:38 +0000539 if (CGM.getSanitizerBlacklist().isIn(*Fn)) {
540 SanOpts = &SanitizerOptions::Disabled;
541 SanitizePerformTypeCheck = false;
542 }
543
Jakob Stoklund Olesen819e54b2010-02-09 00:10:00 +0000544 // Pass inline keyword to optimizer if it appears explicitly on any
Roman Divackydd9bfb22014-01-15 19:07:16 +0000545 // declaration. Also, in the case of -fno-inline attach NoInline
David Majnemer19d7d542014-02-25 10:51:14 +0000546 // attribute to all function that are not marked AlwaysInline.
Roman Divackydd9bfb22014-01-15 19:07:16 +0000547 if (const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(D)) {
548 if (!CGM.getCodeGenOpts().NoInline) {
Aaron Ballman86c93902014-03-06 23:45:36 +0000549 for (auto RI : FD->redecls())
Chad Rosier883b2572012-03-14 23:32:11 +0000550 if (RI->isInlineSpecified()) {
Bill Wendling207f0532012-12-20 19:27:06 +0000551 Fn->addFnAttr(llvm::Attribute::InlineHint);
Chad Rosier883b2572012-03-14 23:32:11 +0000552 break;
553 }
David Majnemer67e541e1c2014-02-25 09:53:29 +0000554 } else if (!FD->hasAttr<AlwaysInlineAttr>())
Roman Divackydd9bfb22014-01-15 19:07:16 +0000555 Fn->addFnAttr(llvm::Attribute::NoInline);
556 }
Jakob Stoklund Olesen819e54b2010-02-09 00:10:00 +0000557
Richard Smith9c6890a2012-11-01 22:30:59 +0000558 if (getLangOpts().OpenCL) {
Peter Collingbourne7ce13fc2011-02-14 01:42:53 +0000559 // Add metadata for a kernel function.
560 if (const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(D))
Tanya Lattnerbcffcdf2012-07-09 22:06:01 +0000561 EmitOpenCLKernelMetadata(FD, Fn);
Peter Collingbourne7ce13fc2011-02-14 01:42:53 +0000562 }
563
Peter Collingbourneb453cd62013-10-20 21:29:19 +0000564 // If we are checking function types, emit a function type signature as
565 // prefix data.
566 if (getLangOpts().CPlusPlus && SanOpts->Function) {
567 if (const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(D)) {
568 if (llvm::Constant *PrefixSig =
569 CGM.getTargetCodeGenInfo().getUBSanFunctionSignature(CGM)) {
570 llvm::Constant *FTRTTIConst =
571 CGM.GetAddrOfRTTIDescriptor(FD->getType(), /*ForEH=*/true);
572 llvm::Constant *PrefixStructElems[] = { PrefixSig, FTRTTIConst };
573 llvm::Constant *PrefixStructConst =
574 llvm::ConstantStruct::getAnon(PrefixStructElems, /*Packed=*/true);
575 Fn->setPrefixData(PrefixStructConst);
576 }
577 }
578 }
579
Daniel Dunbar75283ff2008-11-11 02:29:29 +0000580 llvm::BasicBlock *EntryBB = createBasicBlock("entry", CurFn);
Daniel Dunbar54bb1932008-09-09 21:00:17 +0000581
Chris Lattner5696e7b2008-06-17 18:05:57 +0000582 // Create a marker to make it easy to insert allocas into the entryblock
583 // later. Don't create this with the builder, because we don't want it
584 // folded.
Chris Lattner5e016ae2010-06-27 07:15:29 +0000585 llvm::Value *Undef = llvm::UndefValue::get(Int32Ty);
586 AllocaInsertPt = new llvm::BitCastInst(Undef, Int32Ty, "", EntryBB);
Chris Lattner47640222009-03-22 00:24:14 +0000587 if (Builder.isNamePreserving())
588 AllocaInsertPt->setName("allocapt");
Mike Stump11289f42009-09-09 15:08:12 +0000589
John McCallbd309292010-07-06 01:34:17 +0000590 ReturnBlock = getJumpDestInCurrentScope("return");
Mike Stump11289f42009-09-09 15:08:12 +0000591
Chris Lattner5696e7b2008-06-17 18:05:57 +0000592 Builder.SetInsertPoint(EntryBB);
Mike Stump11289f42009-09-09 15:08:12 +0000593
Sanjiv Gupta1e8b6082008-07-04 11:04:26 +0000594 // Emit subprogram debug descriptor.
Anders Carlsson63784f42009-02-13 08:11:52 +0000595 if (CGDebugInfo *DI = getDebugInfo()) {
Jordan Rose5c382722013-03-08 21:51:21 +0000596 SmallVector<QualType, 16> ArgTypes;
Eric Christopher4b4beb22011-10-21 23:30:10 +0000597 for (FunctionArgList::const_iterator i = Args.begin(), e = Args.end();
598 i != e; ++i) {
Jordan Rose5c382722013-03-08 21:51:21 +0000599 ArgTypes.push_back((*i)->getType());
Eric Christopher4b4beb22011-10-21 23:30:10 +0000600 }
601
John McCalldb40c7f2010-12-14 08:05:40 +0000602 QualType FnType =
Jordan Rose5c382722013-03-08 21:51:21 +0000603 getContext().getFunctionType(RetTy, ArgTypes,
John McCalldb40c7f2010-12-14 08:05:40 +0000604 FunctionProtoType::ExtProtoInfo());
Adrian Prantl42d71b92014-04-10 23:21:53 +0000605 DI->EmitFunctionStart(GD, Loc, StartLoc, FnType, CurFn, Builder);
Sanjiv Gupta1e8b6082008-07-04 11:04:26 +0000606 }
607
Daniel Dunbar468a8f82011-02-10 17:32:22 +0000608 if (ShouldInstrumentFunction())
609 EmitFunctionInstrumentation("__cyg_profile_func_enter");
Chris Lattner3c77a352010-06-22 00:03:40 +0000610
Roman Divacky178e01602011-02-10 16:52:03 +0000611 if (CGM.getCodeGenOpts().InstrumentForProfiling)
612 EmitMCountInstrumentation();
613
Eli Friedman4b1942c2009-12-04 02:43:40 +0000614 if (RetTy->isVoidType()) {
615 // Void type; nothing to return.
616 ReturnValue = 0;
Adrian Prantl2cede0f2014-04-29 01:07:59 +0000617
618 // Count the implicit return.
619 if (!endsWithReturn(D))
620 ++NumReturnExprs;
Eli Friedman4b1942c2009-12-04 02:43:40 +0000621 } else if (CurFnInfo->getReturnInfo().getKind() == ABIArgInfo::Indirect &&
John McCall47fb9502013-03-07 21:37:08 +0000622 !hasScalarEvaluationKind(CurFnInfo->getReturnType())) {
Eli Friedman4b1942c2009-12-04 02:43:40 +0000623 // Indirect aggregate return; emit returned value directly into sret slot.
Daniel Dunbarfd09df72010-02-16 19:45:20 +0000624 // This reduces code size, and affects correctness in C++.
Reid Kleckner37abaca2014-05-09 22:46:15 +0000625 auto AI = CurFn->arg_begin();
626 if (CurFnInfo->getReturnInfo().isSRetAfterThis())
627 ++AI;
628 ReturnValue = AI;
Reid Kleckner314ef7b2014-02-01 00:04:45 +0000629 } else if (CurFnInfo->getReturnInfo().getKind() == ABIArgInfo::InAlloca &&
630 !hasScalarEvaluationKind(CurFnInfo->getReturnType())) {
631 // Load the sret pointer from the argument struct and return into that.
632 unsigned Idx = CurFnInfo->getReturnInfo().getInAllocaFieldIndex();
633 llvm::Function::arg_iterator EI = CurFn->arg_end();
634 --EI;
635 llvm::Value *Addr = Builder.CreateStructGEP(EI, Idx);
636 ReturnValue = Builder.CreateLoad(Addr, "agg.result");
Eli Friedman4b1942c2009-12-04 02:43:40 +0000637 } else {
Daniel Dunbarfd09df72010-02-16 19:45:20 +0000638 ReturnValue = CreateIRTemp(RetTy, "retval");
John McCall31168b02011-06-15 23:02:42 +0000639
640 // Tell the epilog emitter to autorelease the result. We do this
641 // now so that various specialized functions can suppress it
642 // during their IR-generation.
David Blaikiebbafb8a2012-03-11 07:00:24 +0000643 if (getLangOpts().ObjCAutoRefCount &&
John McCall31168b02011-06-15 23:02:42 +0000644 !CurFnInfo->isReturnsRetained() &&
645 RetTy->isObjCRetainableType())
646 AutoreleaseResult = true;
Eli Friedman4b1942c2009-12-04 02:43:40 +0000647 }
648
Mike Stump1d849212009-12-07 23:38:24 +0000649 EmitStartEHSpec(CurCodeDecl);
John McCall31168b02011-06-15 23:02:42 +0000650
651 PrologueCleanupDepth = EHStack.stable_begin();
Daniel Dunbard931a872009-02-02 22:03:45 +0000652 EmitFunctionProlog(*CurFnInfo, CurFn, Args);
Mike Stump11289f42009-09-09 15:08:12 +0000653
Eli Friedman9fbeba02012-02-11 02:57:39 +0000654 if (D && isa<CXXMethodDecl>(D) && cast<CXXMethodDecl>(D)->isInstance()) {
John McCall5d865c322010-08-31 07:33:07 +0000655 CGM.getCXXABI().EmitInstanceFunctionProlog(*this);
Eli Friedman9fbeba02012-02-11 02:57:39 +0000656 const CXXMethodDecl *MD = cast<CXXMethodDecl>(D);
657 if (MD->getParent()->isLambda() &&
658 MD->getOverloadedOperator() == OO_Call) {
659 // We're in a lambda; figure out the captures.
660 MD->getParent()->getCaptureFields(LambdaCaptureFields,
661 LambdaThisCaptureField);
662 if (LambdaThisCaptureField) {
663 // If this lambda captures this, load it.
John McCalldec348f72013-05-03 07:33:41 +0000664 LValue ThisLValue = EmitLValueForLambdaField(LambdaThisCaptureField);
Nick Lewycky2d84e842013-10-02 02:29:49 +0000665 CXXThisValue = EmitLoadOfLValue(ThisLValue,
666 SourceLocation()).getScalarVal();
Eli Friedman9fbeba02012-02-11 02:57:39 +0000667 }
668 } else {
669 // Not in a lambda; just use 'this' from the method.
670 // FIXME: Should we generate a new load for each use of 'this'? The
671 // fast register allocator would be happier...
672 CXXThisValue = CXXABIThisValue;
673 }
674 }
John McCall347132b2010-02-16 22:04:33 +0000675
Anders Carlssonc20879a2008-12-20 21:28:43 +0000676 // If any of the arguments have a variably modified type, make sure to
677 // emit the type size.
678 for (FunctionArgList::const_iterator i = Args.begin(), e = Args.end();
679 i != e; ++i) {
Eli Friedman1f576832012-11-14 22:09:59 +0000680 const VarDecl *VD = *i;
681
682 // Dig out the type as written from ParmVarDecls; it's unclear whether
683 // the standard (C99 6.9.1p10) requires this, but we're following the
684 // precedent set by gcc.
685 QualType Ty;
686 if (const ParmVarDecl *PVD = dyn_cast<ParmVarDecl>(VD))
687 Ty = PVD->getOriginalType();
688 else
689 Ty = VD->getType();
Anders Carlssonc20879a2008-12-20 21:28:43 +0000690
691 if (Ty->isVariablyModifiedType())
John McCall23c29fe2011-06-24 21:55:10 +0000692 EmitVariablyModifiedType(Ty);
Anders Carlssonc20879a2008-12-20 21:28:43 +0000693 }
Eric Christopher7cdf9482011-10-13 21:45:18 +0000694 // Emit a location at the end of the prologue.
695 if (CGDebugInfo *DI = getDebugInfo())
696 DI->EmitLocation(Builder, StartLoc);
Daniel Dunbarbc915f42008-09-09 23:14:03 +0000697}
Eli Friedman3d421e12008-08-25 21:31:01 +0000698
Richard Smithb47c36f2013-11-05 09:12:18 +0000699void CodeGenFunction::EmitFunctionBody(FunctionArgList &Args,
700 const Stmt *Body) {
Justin Bogneref512b92014-01-06 22:27:43 +0000701 RegionCounter Cnt = getPGORegionCounter(Body);
702 Cnt.beginRegion(Builder);
Richard Smithb47c36f2013-11-05 09:12:18 +0000703 if (const CompoundStmt *S = dyn_cast<CompoundStmt>(Body))
David Blaikie0a21d0d2013-01-26 22:16:26 +0000704 EmitCompoundStmtWithoutScope(*S);
705 else
Richard Smithb47c36f2013-11-05 09:12:18 +0000706 EmitStmt(Body);
John McCall89b12b32010-02-18 03:17:58 +0000707}
708
Bob Wilsonbf854f02014-02-17 19:21:09 +0000709/// When instrumenting to collect profile data, the counts for some blocks
710/// such as switch cases need to not include the fall-through counts, so
711/// emit a branch around the instrumentation code. When not instrumenting,
712/// this just calls EmitBlock().
713void CodeGenFunction::EmitBlockWithFallThrough(llvm::BasicBlock *BB,
714 RegionCounter &Cnt) {
715 llvm::BasicBlock *SkipCountBB = 0;
716 if (HaveInsertPoint() && CGM.getCodeGenOpts().ProfileInstrGenerate) {
717 // When instrumenting for profiling, the fallthrough to certain
718 // statements needs to skip over the instrumentation code so that we
719 // get an accurate count.
720 SkipCountBB = createBasicBlock("skipcount");
721 EmitBranch(SkipCountBB);
722 }
723 EmitBlock(BB);
724 Cnt.beginRegion(Builder, /*AddIncomingFallThrough=*/true);
725 if (SkipCountBB)
726 EmitBlock(SkipCountBB);
727}
728
John McCall8601a752010-08-03 22:46:07 +0000729/// Tries to mark the given function nounwind based on the
730/// non-existence of any throwing calls within it. We believe this is
731/// lightweight enough to do at -O0.
732static void TryMarkNoThrow(llvm::Function *F) {
John McCall59966992010-08-11 22:38:33 +0000733 // LLVM treats 'nounwind' on a function as part of the type, so we
734 // can't do this on functions that can be overwritten.
735 if (F->mayBeOverridden()) return;
736
John McCall8601a752010-08-03 22:46:07 +0000737 for (llvm::Function::iterator FI = F->begin(), FE = F->end(); FI != FE; ++FI)
738 for (llvm::BasicBlock::iterator
739 BI = FI->begin(), BE = FI->end(); BI != BE; ++BI)
Bill Wendlingf0724e82011-09-19 20:31:14 +0000740 if (llvm::CallInst *Call = dyn_cast<llvm::CallInst>(&*BI)) {
John McCall8601a752010-08-03 22:46:07 +0000741 if (!Call->doesNotThrow())
742 return;
Bill Wendlingf0724e82011-09-19 20:31:14 +0000743 } else if (isa<llvm::ResumeInst>(&*BI)) {
744 return;
745 }
Bill Wendling73e465e2012-10-10 03:13:20 +0000746 F->setDoesNotThrow();
John McCall8601a752010-08-03 22:46:07 +0000747}
748
Richard Smithb47c36f2013-11-05 09:12:18 +0000749static void EmitSizedDeallocationFunction(CodeGenFunction &CGF,
750 const FunctionDecl *UnsizedDealloc) {
751 // This is a weak discardable definition of the sized deallocation function.
752 CGF.CurFn->setLinkage(llvm::Function::LinkOnceAnyLinkage);
753
754 // Call the unsized deallocation function and forward the first argument
755 // unchanged.
756 llvm::Constant *Unsized = CGF.CGM.GetAddrOfFunction(UnsizedDealloc);
757 CGF.Builder.CreateCall(Unsized, &*CGF.CurFn->arg_begin());
758}
759
John McCalla738c252011-03-09 04:27:21 +0000760void CodeGenFunction::GenerateCode(GlobalDecl GD, llvm::Function *Fn,
761 const CGFunctionInfo &FnInfo) {
Anders Carlsson73fcc952009-09-11 00:07:24 +0000762 const FunctionDecl *FD = cast<FunctionDecl>(GD.getDecl());
Michael Ilseman686240a2012-12-04 00:29:55 +0000763
Anders Carlsson63784f42009-02-13 08:11:52 +0000764 // Check if we should generate debug info for this function.
David Blaikie92848de2013-08-26 20:33:21 +0000765 if (FD->hasAttr<NoDebugAttr>())
766 DebugInfo = NULL; // disable debug info indefinitely for this function
Mike Stump11289f42009-09-09 15:08:12 +0000767
Daniel Dunbarbc915f42008-09-09 23:14:03 +0000768 FunctionArgList Args;
Alp Toker314cc812014-01-25 16:55:45 +0000769 QualType ResTy = FD->getReturnType();
Mike Stump11289f42009-09-09 15:08:12 +0000770
Mike Stumpbee78dd2009-12-04 23:26:17 +0000771 CurGD = GD;
Reid Kleckner89077a12013-12-17 19:46:40 +0000772 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD);
773 if (MD && MD->isInstance()) {
Stephen Lin9dc6eef2013-06-30 20:40:16 +0000774 if (CGM.getCXXABI().HasThisReturn(GD))
775 ResTy = MD->getThisType(getContext());
Reid Kleckner89077a12013-12-17 19:46:40 +0000776 CGM.getCXXABI().buildThisParam(*this, Args);
Stephen Lin9dc6eef2013-06-30 20:40:16 +0000777 }
Mike Stump11289f42009-09-09 15:08:12 +0000778
Chad Rosierf0cccf52012-02-18 00:37:07 +0000779 for (unsigned i = 0, e = FD->getNumParams(); i != e; ++i)
780 Args.push_back(FD->getParamDecl(i));
Daniel Dunbar89654ee2008-08-26 08:29:31 +0000781
Reid Kleckner89077a12013-12-17 19:46:40 +0000782 if (MD && (isa<CXXConstructorDecl>(MD) || isa<CXXDestructorDecl>(MD)))
783 CGM.getCXXABI().addImplicitStructorParams(*this, ResTy, Args);
784
John McCall89b12b32010-02-18 03:17:58 +0000785 SourceRange BodyRange;
786 if (Stmt *Body = FD->getBody()) BodyRange = Body->getSourceRange();
Adrian Prantldc237b52013-05-16 00:41:26 +0000787 CurEHLocation = BodyRange.getEnd();
Anders Carlsson438cf922009-11-06 02:55:43 +0000788
Adrian Prantl42d71b92014-04-10 23:21:53 +0000789 // Use the location of the start of the function to determine where
790 // the function definition is located. By default use the location
791 // of the declaration as the location for the subprogram. A function
792 // may lack a declaration in the source code if it is created by code
793 // gen. (examples: _GLOBAL__I_a, __cxx_global_array_dtor, thunk).
794 SourceLocation Loc;
795 if (FD) {
796 Loc = FD->getLocation();
797
798 // If this is a function specialization then use the pattern body
799 // as the location for the function.
800 if (const FunctionDecl *SpecDecl = FD->getTemplateInstantiationPattern())
801 if (SpecDecl->hasBody(SpecDecl))
802 Loc = SpecDecl->getLocation();
803 }
804
John McCall89b12b32010-02-18 03:17:58 +0000805 // Emit the standard function prologue.
Adrian Prantl42d71b92014-04-10 23:21:53 +0000806 StartFunction(GD, ResTy, Fn, FnInfo, Args, Loc, BodyRange.getBegin());
Anders Carlsson438cf922009-11-06 02:55:43 +0000807
John McCall89b12b32010-02-18 03:17:58 +0000808 // Generate the body of the function.
Bob Wilsonda1ebed2014-03-06 04:55:41 +0000809 PGO.assignRegionCounters(GD.getDecl(), CurFn);
John McCallb81884d2010-02-19 09:25:03 +0000810 if (isa<CXXDestructorDecl>(FD))
811 EmitDestructorBody(Args);
812 else if (isa<CXXConstructorDecl>(FD))
813 EmitConstructorBody(Args);
Richard Smith9c6890a2012-11-01 22:30:59 +0000814 else if (getLangOpts().CUDA &&
Peter Collingbournefa4d6032011-10-06 18:51:56 +0000815 !CGM.getCodeGenOpts().CUDAIsDevice &&
816 FD->hasAttr<CUDAGlobalAttr>())
817 CGM.getCUDARuntime().EmitDeviceStubBody(*this, Args);
Eli Friedman5a6d5072012-02-16 01:37:33 +0000818 else if (isa<CXXConversionDecl>(FD) &&
Douglas Gregor355efbb2012-02-17 03:02:34 +0000819 cast<CXXConversionDecl>(FD)->isLambdaToBlockPointerConversion()) {
820 // The lambda conversion to block pointer is special; the semantics can't be
821 // expressed in the AST, so IRGen needs to special-case it.
822 EmitLambdaToBlockPointerBody(Args);
823 } else if (isa<CXXMethodDecl>(FD) &&
824 cast<CXXMethodDecl>(FD)->isLambdaStaticInvoker()) {
Faisal Vali2b391ab2013-09-26 19:54:12 +0000825 // The lambda static invoker function is special, because it forwards or
Douglas Gregor355efbb2012-02-17 03:02:34 +0000826 // clones the body of the function call operator (but is actually static).
827 EmitLambdaStaticInvokeFunction(cast<CXXMethodDecl>(FD));
Lang Hamesbf122742013-02-17 07:22:09 +0000828 } else if (FD->isDefaulted() && isa<CXXMethodDecl>(FD) &&
Nick Lewyckyb39be1f2013-09-10 05:14:39 +0000829 (cast<CXXMethodDecl>(FD)->isCopyAssignmentOperator() ||
830 cast<CXXMethodDecl>(FD)->isMoveAssignmentOperator())) {
Lang Hamesbf122742013-02-17 07:22:09 +0000831 // Implicit copy-assignment gets the same special treatment as implicit
832 // copy-constructors.
833 emitImplicitAssignmentOperatorBody(Args);
Richard Smithb47c36f2013-11-05 09:12:18 +0000834 } else if (Stmt *Body = FD->getBody()) {
835 EmitFunctionBody(Args, Body);
836 } else if (FunctionDecl *UnsizedDealloc =
837 FD->getCorrespondingUnsizedGlobalDeallocationFunction()) {
838 // Global sized deallocation functions get an implicit weak definition if
839 // they don't have an explicit definition.
840 EmitSizedDeallocationFunction(*this, UnsizedDealloc);
841 } else
842 llvm_unreachable("no definition for emitted function");
Anders Carlssonff8cce42010-02-07 19:45:40 +0000843
Richard Smith9f9e5822012-10-04 23:52:29 +0000844 // C++11 [stmt.return]p2:
845 // Flowing off the end of a function [...] results in undefined behavior in
846 // a value-returning function.
847 // C11 6.9.1p12:
848 // If the '}' that terminates a function is reached, and the value of the
849 // function call is used by the caller, the behavior is undefined.
Richard Smith9c6890a2012-11-01 22:30:59 +0000850 if (getLangOpts().CPlusPlus && !FD->hasImplicitReturnZero() &&
Alp Toker314cc812014-01-25 16:55:45 +0000851 !FD->getReturnType()->isVoidType() && Builder.GetInsertBlock()) {
Will Dietzf54319c2013-01-18 11:30:38 +0000852 if (SanOpts->Return)
Richard Smithe30752c2012-10-09 19:52:38 +0000853 EmitCheck(Builder.getFalse(), "missing_return",
854 EmitCheckSourceLocation(FD->getLocation()),
Dmitri Gribenkof8579502013-01-12 19:30:44 +0000855 ArrayRef<llvm::Value *>(), CRK_Unrecoverable);
Richard Smith6b4ebcc2012-10-15 00:23:07 +0000856 else if (CGM.getCodeGenOpts().OptimizationLevel == 0)
857 Builder.CreateCall(CGM.getIntrinsic(llvm::Intrinsic::trap));
Richard Smith9f9e5822012-10-04 23:52:29 +0000858 Builder.CreateUnreachable();
859 Builder.ClearInsertionPoint();
860 }
861
John McCall89b12b32010-02-18 03:17:58 +0000862 // Emit the standard function epilogue.
863 FinishFunction(BodyRange.getEnd());
John McCall8601a752010-08-03 22:46:07 +0000864
865 // If we haven't marked the function nothrow through other means, do
866 // a quick pass now to see if we can.
867 if (!CurFn->doesNotThrow())
868 TryMarkNoThrow(CurFn);
Justin Bogneref512b92014-01-06 22:27:43 +0000869
Duncan P. N. Exon Smith2fe531c2014-03-17 21:18:30 +0000870 PGO.emitInstrumentationData();
Justin Bogneref512b92014-01-06 22:27:43 +0000871 PGO.destroyRegionCounters();
Chris Lattner5696e7b2008-06-17 18:05:57 +0000872}
873
Chris Lattner5b1964b2008-11-11 07:41:27 +0000874/// ContainsLabel - Return true if the statement contains a label in it. If
875/// this statement is not executed normally, it not containing a label means
876/// that we can just remove the code.
877bool CodeGenFunction::ContainsLabel(const Stmt *S, bool IgnoreCaseStmts) {
878 // Null statement, not a label!
879 if (S == 0) return false;
Mike Stump11289f42009-09-09 15:08:12 +0000880
Chris Lattner5b1964b2008-11-11 07:41:27 +0000881 // If this is a label, we have to emit the code, consider something like:
882 // if (0) { ... foo: bar(); } goto foo;
Chris Lattner29911cc2011-02-28 00:18:40 +0000883 //
884 // TODO: If anyone cared, we could track __label__'s, since we know that you
885 // can't jump to one from outside their declared region.
Chris Lattner5b1964b2008-11-11 07:41:27 +0000886 if (isa<LabelStmt>(S))
887 return true;
Michael Ilseman686240a2012-12-04 00:29:55 +0000888
Chris Lattner5b1964b2008-11-11 07:41:27 +0000889 // If this is a case/default statement, and we haven't seen a switch, we have
890 // to emit the code.
891 if (isa<SwitchCase>(S) && !IgnoreCaseStmts)
892 return true;
Mike Stump11289f42009-09-09 15:08:12 +0000893
Chris Lattner5b1964b2008-11-11 07:41:27 +0000894 // If this is a switch statement, we want to ignore cases below it.
895 if (isa<SwitchStmt>(S))
896 IgnoreCaseStmts = true;
Mike Stump11289f42009-09-09 15:08:12 +0000897
Chris Lattner5b1964b2008-11-11 07:41:27 +0000898 // Scan subexpressions for verboten labels.
John McCall8322c3a2011-02-13 04:07:26 +0000899 for (Stmt::const_child_range I = S->children(); I; ++I)
Chris Lattner5b1964b2008-11-11 07:41:27 +0000900 if (ContainsLabel(*I, IgnoreCaseStmts))
901 return true;
Mike Stump11289f42009-09-09 15:08:12 +0000902
Chris Lattner5b1964b2008-11-11 07:41:27 +0000903 return false;
904}
905
Chris Lattner29911cc2011-02-28 00:18:40 +0000906/// containsBreak - Return true if the statement contains a break out of it.
907/// If the statement (recursively) contains a switch or loop with a break
908/// inside of it, this is fine.
909bool CodeGenFunction::containsBreak(const Stmt *S) {
910 // Null statement, not a label!
911 if (S == 0) return false;
912
913 // If this is a switch or loop that defines its own break scope, then we can
914 // include it and anything inside of it.
915 if (isa<SwitchStmt>(S) || isa<WhileStmt>(S) || isa<DoStmt>(S) ||
916 isa<ForStmt>(S))
Chris Lattner30db8282011-02-28 00:42:31 +0000917 return false;
Michael Ilseman686240a2012-12-04 00:29:55 +0000918
Chris Lattner30db8282011-02-28 00:42:31 +0000919 if (isa<BreakStmt>(S))
Chris Lattner29911cc2011-02-28 00:18:40 +0000920 return true;
Michael Ilseman686240a2012-12-04 00:29:55 +0000921
Chris Lattner29911cc2011-02-28 00:18:40 +0000922 // Scan subexpressions for verboten breaks.
923 for (Stmt::const_child_range I = S->children(); I; ++I)
924 if (containsBreak(*I))
925 return true;
Michael Ilseman686240a2012-12-04 00:29:55 +0000926
Chris Lattner29911cc2011-02-28 00:18:40 +0000927 return false;
928}
929
Chris Lattnercd439292008-11-12 08:04:58 +0000930
Chris Lattner41c6ab52011-02-27 23:02:32 +0000931/// ConstantFoldsToSimpleInteger - If the specified expression does not fold
932/// to a constant, or if it does but contains a label, return false. If it
933/// constant folds return true and set the boolean result in Result.
934bool CodeGenFunction::ConstantFoldsToSimpleInteger(const Expr *Cond,
935 bool &ResultBool) {
Richard Trieuc320c742012-07-23 20:21:35 +0000936 llvm::APSInt ResultInt;
Chris Lattner29911cc2011-02-28 00:18:40 +0000937 if (!ConstantFoldsToSimpleInteger(Cond, ResultInt))
938 return false;
Michael Ilseman686240a2012-12-04 00:29:55 +0000939
Chris Lattner29911cc2011-02-28 00:18:40 +0000940 ResultBool = ResultInt.getBoolValue();
941 return true;
942}
943
944/// ConstantFoldsToSimpleInteger - If the specified expression does not fold
945/// to a constant, or if it does but contains a label, return false. If it
946/// constant folds return true and set the folded value.
947bool CodeGenFunction::
Richard Trieuc320c742012-07-23 20:21:35 +0000948ConstantFoldsToSimpleInteger(const Expr *Cond, llvm::APSInt &ResultInt) {
Daniel Dunbarf32443c2008-11-12 22:37:10 +0000949 // FIXME: Rename and handle conversion of other evaluatable things
950 // to bool.
Richard Smith5fab0c92011-12-28 19:48:30 +0000951 llvm::APSInt Int;
952 if (!Cond->EvaluateAsInt(Int, getContext()))
Chris Lattner41c6ab52011-02-27 23:02:32 +0000953 return false; // Not foldable, not integer or not fully evaluatable.
Richard Smith5fab0c92011-12-28 19:48:30 +0000954
Chris Lattnercd439292008-11-12 08:04:58 +0000955 if (CodeGenFunction::ContainsLabel(Cond))
Chris Lattner41c6ab52011-02-27 23:02:32 +0000956 return false; // Contains a label.
Richard Smith5fab0c92011-12-28 19:48:30 +0000957
958 ResultInt = Int;
Chris Lattner41c6ab52011-02-27 23:02:32 +0000959 return true;
Chris Lattnercd439292008-11-12 08:04:58 +0000960}
961
962
Chris Lattner29911cc2011-02-28 00:18:40 +0000963
Chris Lattnercd439292008-11-12 08:04:58 +0000964/// EmitBranchOnBoolExpr - Emit a branch on a boolean condition (e.g. for an if
965/// statement) to the specified blocks. Based on the condition, this might try
966/// to simplify the codegen of the conditional based on the branch.
967///
968void CodeGenFunction::EmitBranchOnBoolExpr(const Expr *Cond,
969 llvm::BasicBlock *TrueBlock,
Justin Bogneref512b92014-01-06 22:27:43 +0000970 llvm::BasicBlock *FalseBlock,
971 uint64_t TrueCount) {
Peter Collingbourne91147592011-04-15 00:35:48 +0000972 Cond = Cond->IgnoreParens();
Mike Stump11289f42009-09-09 15:08:12 +0000973
Chris Lattnercd439292008-11-12 08:04:58 +0000974 if (const BinaryOperator *CondBOp = dyn_cast<BinaryOperator>(Cond)) {
Justin Bogneref512b92014-01-06 22:27:43 +0000975
Chris Lattnercd439292008-11-12 08:04:58 +0000976 // Handle X && Y in a condition.
John McCalle3027922010-08-25 11:45:40 +0000977 if (CondBOp->getOpcode() == BO_LAnd) {
Bob Wilsonbf854f02014-02-17 19:21:09 +0000978 RegionCounter Cnt = getPGORegionCounter(CondBOp);
979
Chris Lattnercd439292008-11-12 08:04:58 +0000980 // If we have "1 && X", simplify the code. "0 && X" would have constant
981 // folded if the case was simple enough.
Bill Wendling6c9540e2011-03-04 21:46:03 +0000982 bool ConstantBool = false;
Chris Lattner41c6ab52011-02-27 23:02:32 +0000983 if (ConstantFoldsToSimpleInteger(CondBOp->getLHS(), ConstantBool) &&
984 ConstantBool) {
Chris Lattnercd439292008-11-12 08:04:58 +0000985 // br(1 && X) -> br(X).
Justin Bogneref512b92014-01-06 22:27:43 +0000986 Cnt.beginRegion(Builder);
987 return EmitBranchOnBoolExpr(CondBOp->getRHS(), TrueBlock, FalseBlock,
988 TrueCount);
Chris Lattnercd439292008-11-12 08:04:58 +0000989 }
Mike Stump11289f42009-09-09 15:08:12 +0000990
Chris Lattnercd439292008-11-12 08:04:58 +0000991 // If we have "X && 1", simplify the code to use an uncond branch.
992 // "X && 0" would have been constant folded to 0.
Chris Lattner41c6ab52011-02-27 23:02:32 +0000993 if (ConstantFoldsToSimpleInteger(CondBOp->getRHS(), ConstantBool) &&
994 ConstantBool) {
Chris Lattnercd439292008-11-12 08:04:58 +0000995 // br(X && 1) -> br(X).
Justin Bogneref512b92014-01-06 22:27:43 +0000996 return EmitBranchOnBoolExpr(CondBOp->getLHS(), TrueBlock, FalseBlock,
997 TrueCount);
Chris Lattnercd439292008-11-12 08:04:58 +0000998 }
Mike Stump11289f42009-09-09 15:08:12 +0000999
Chris Lattnercd439292008-11-12 08:04:58 +00001000 // Emit the LHS as a conditional. If the LHS conditional is false, we
1001 // want to jump to the FalseBlock.
Daniel Dunbara612e792008-11-13 01:38:36 +00001002 llvm::BasicBlock *LHSTrue = createBasicBlock("land.lhs.true");
Justin Bogneref512b92014-01-06 22:27:43 +00001003 // The counter tells us how often we evaluate RHS, and all of TrueCount
1004 // can be propagated to that branch.
1005 uint64_t RHSCount = Cnt.getCount();
John McCallce1de612011-01-26 04:00:11 +00001006
1007 ConditionalEvaluation eval(*this);
Justin Bogneref512b92014-01-06 22:27:43 +00001008 EmitBranchOnBoolExpr(CondBOp->getLHS(), LHSTrue, FalseBlock, RHSCount);
Chris Lattnercd439292008-11-12 08:04:58 +00001009 EmitBlock(LHSTrue);
Mike Stump11289f42009-09-09 15:08:12 +00001010
Anders Carlsson60ddba62010-01-24 00:20:05 +00001011 // Any temporaries created here are conditional.
Justin Bogneref512b92014-01-06 22:27:43 +00001012 Cnt.beginRegion(Builder);
John McCallce1de612011-01-26 04:00:11 +00001013 eval.begin(*this);
Justin Bogneref512b92014-01-06 22:27:43 +00001014 EmitBranchOnBoolExpr(CondBOp->getRHS(), TrueBlock, FalseBlock, TrueCount);
John McCallce1de612011-01-26 04:00:11 +00001015 eval.end(*this);
Anders Carlsson60ddba62010-01-24 00:20:05 +00001016
Chris Lattnercd439292008-11-12 08:04:58 +00001017 return;
Chris Lattner41c6ab52011-02-27 23:02:32 +00001018 }
Michael Ilseman686240a2012-12-04 00:29:55 +00001019
Chris Lattner41c6ab52011-02-27 23:02:32 +00001020 if (CondBOp->getOpcode() == BO_LOr) {
Bob Wilsonbf854f02014-02-17 19:21:09 +00001021 RegionCounter Cnt = getPGORegionCounter(CondBOp);
1022
Chris Lattnercd439292008-11-12 08:04:58 +00001023 // If we have "0 || X", simplify the code. "1 || X" would have constant
1024 // folded if the case was simple enough.
Bill Wendling6c9540e2011-03-04 21:46:03 +00001025 bool ConstantBool = false;
Chris Lattner41c6ab52011-02-27 23:02:32 +00001026 if (ConstantFoldsToSimpleInteger(CondBOp->getLHS(), ConstantBool) &&
1027 !ConstantBool) {
Chris Lattnercd439292008-11-12 08:04:58 +00001028 // br(0 || X) -> br(X).
Justin Bogneref512b92014-01-06 22:27:43 +00001029 Cnt.beginRegion(Builder);
1030 return EmitBranchOnBoolExpr(CondBOp->getRHS(), TrueBlock, FalseBlock,
1031 TrueCount);
Chris Lattnercd439292008-11-12 08:04:58 +00001032 }
Mike Stump11289f42009-09-09 15:08:12 +00001033
Chris Lattnercd439292008-11-12 08:04:58 +00001034 // If we have "X || 0", simplify the code to use an uncond branch.
1035 // "X || 1" would have been constant folded to 1.
Chris Lattner41c6ab52011-02-27 23:02:32 +00001036 if (ConstantFoldsToSimpleInteger(CondBOp->getRHS(), ConstantBool) &&
1037 !ConstantBool) {
Chris Lattnercd439292008-11-12 08:04:58 +00001038 // br(X || 0) -> br(X).
Justin Bogneref512b92014-01-06 22:27:43 +00001039 return EmitBranchOnBoolExpr(CondBOp->getLHS(), TrueBlock, FalseBlock,
1040 TrueCount);
Chris Lattnercd439292008-11-12 08:04:58 +00001041 }
Mike Stump11289f42009-09-09 15:08:12 +00001042
Chris Lattnercd439292008-11-12 08:04:58 +00001043 // Emit the LHS as a conditional. If the LHS conditional is true, we
1044 // want to jump to the TrueBlock.
Daniel Dunbara612e792008-11-13 01:38:36 +00001045 llvm::BasicBlock *LHSFalse = createBasicBlock("lor.lhs.false");
Justin Bogneref512b92014-01-06 22:27:43 +00001046 // We have the count for entry to the RHS and for the whole expression
1047 // being true, so we can divy up True count between the short circuit and
1048 // the RHS.
Justin Bognerbe614c72014-01-23 02:54:30 +00001049 uint64_t LHSCount = Cnt.getParentCount() - Cnt.getCount();
Justin Bogneref512b92014-01-06 22:27:43 +00001050 uint64_t RHSCount = TrueCount - LHSCount;
John McCallce1de612011-01-26 04:00:11 +00001051
1052 ConditionalEvaluation eval(*this);
Justin Bogneref512b92014-01-06 22:27:43 +00001053 EmitBranchOnBoolExpr(CondBOp->getLHS(), TrueBlock, LHSFalse, LHSCount);
Chris Lattnercd439292008-11-12 08:04:58 +00001054 EmitBlock(LHSFalse);
Mike Stump11289f42009-09-09 15:08:12 +00001055
Anders Carlsson60ddba62010-01-24 00:20:05 +00001056 // Any temporaries created here are conditional.
Justin Bogneref512b92014-01-06 22:27:43 +00001057 Cnt.beginRegion(Builder);
John McCallce1de612011-01-26 04:00:11 +00001058 eval.begin(*this);
Justin Bogneref512b92014-01-06 22:27:43 +00001059 EmitBranchOnBoolExpr(CondBOp->getRHS(), TrueBlock, FalseBlock, RHSCount);
1060
John McCallce1de612011-01-26 04:00:11 +00001061 eval.end(*this);
Anders Carlsson60ddba62010-01-24 00:20:05 +00001062
Chris Lattnercd439292008-11-12 08:04:58 +00001063 return;
1064 }
Chris Lattnerd9537732008-11-12 08:13:36 +00001065 }
Mike Stump11289f42009-09-09 15:08:12 +00001066
Chris Lattnerd9537732008-11-12 08:13:36 +00001067 if (const UnaryOperator *CondUOp = dyn_cast<UnaryOperator>(Cond)) {
1068 // br(!x, t, f) -> br(x, f, t)
Justin Bogneref512b92014-01-06 22:27:43 +00001069 if (CondUOp->getOpcode() == UO_LNot) {
1070 // Negate the count.
1071 uint64_t FalseCount = PGO.getCurrentRegionCount() - TrueCount;
1072 // Negate the condition and swap the destination blocks.
1073 return EmitBranchOnBoolExpr(CondUOp->getSubExpr(), FalseBlock, TrueBlock,
1074 FalseCount);
1075 }
Chris Lattnercd439292008-11-12 08:04:58 +00001076 }
Mike Stump11289f42009-09-09 15:08:12 +00001077
Daniel Dunbarbf3c22e2008-11-12 10:30:32 +00001078 if (const ConditionalOperator *CondOp = dyn_cast<ConditionalOperator>(Cond)) {
Eli Friedman248f8982012-02-14 03:54:45 +00001079 // br(c ? x : y, t, f) -> br(c, br(x, t, f), br(y, t, f))
1080 llvm::BasicBlock *LHSBlock = createBasicBlock("cond.true");
1081 llvm::BasicBlock *RHSBlock = createBasicBlock("cond.false");
Daniel Dunbarbf3c22e2008-11-12 10:30:32 +00001082
Justin Bogneref512b92014-01-06 22:27:43 +00001083 RegionCounter Cnt = getPGORegionCounter(CondOp);
Eli Friedman248f8982012-02-14 03:54:45 +00001084 ConditionalEvaluation cond(*this);
Justin Bogneref512b92014-01-06 22:27:43 +00001085 EmitBranchOnBoolExpr(CondOp->getCond(), LHSBlock, RHSBlock, Cnt.getCount());
1086
1087 // When computing PGO branch weights, we only know the overall count for
1088 // the true block. This code is essentially doing tail duplication of the
1089 // naive code-gen, introducing new edges for which counts are not
1090 // available. Divide the counts proportionally between the LHS and RHS of
1091 // the conditional operator.
1092 uint64_t LHSScaledTrueCount = 0;
1093 if (TrueCount) {
Bob Wilsonbf854f02014-02-17 19:21:09 +00001094 double LHSRatio = Cnt.getCount() / (double) Cnt.getParentCount();
Justin Bogneref512b92014-01-06 22:27:43 +00001095 LHSScaledTrueCount = TrueCount * LHSRatio;
1096 }
John McCallce1de612011-01-26 04:00:11 +00001097
Eli Friedman248f8982012-02-14 03:54:45 +00001098 cond.begin(*this);
1099 EmitBlock(LHSBlock);
Justin Bogneref512b92014-01-06 22:27:43 +00001100 Cnt.beginRegion(Builder);
1101 EmitBranchOnBoolExpr(CondOp->getLHS(), TrueBlock, FalseBlock,
1102 LHSScaledTrueCount);
Eli Friedman248f8982012-02-14 03:54:45 +00001103 cond.end(*this);
John McCallce1de612011-01-26 04:00:11 +00001104
Eli Friedman248f8982012-02-14 03:54:45 +00001105 cond.begin(*this);
1106 EmitBlock(RHSBlock);
Justin Bogneref512b92014-01-06 22:27:43 +00001107 EmitBranchOnBoolExpr(CondOp->getRHS(), TrueBlock, FalseBlock,
1108 TrueCount - LHSScaledTrueCount);
Eli Friedman248f8982012-02-14 03:54:45 +00001109 cond.end(*this);
John McCallce1de612011-01-26 04:00:11 +00001110
Eli Friedman248f8982012-02-14 03:54:45 +00001111 return;
Daniel Dunbarbf3c22e2008-11-12 10:30:32 +00001112 }
1113
Richard Smithea852322013-05-07 21:53:22 +00001114 if (const CXXThrowExpr *Throw = dyn_cast<CXXThrowExpr>(Cond)) {
1115 // Conditional operator handling can give us a throw expression as a
1116 // condition for a case like:
1117 // br(c ? throw x : y, t, f) -> br(c, br(throw x, t, f), br(y, t, f)
1118 // Fold this to:
1119 // br(c, throw x, br(y, t, f))
1120 EmitCXXThrowExpr(Throw, /*KeepInsertionPoint*/false);
1121 return;
1122 }
1123
Justin Bogneref512b92014-01-06 22:27:43 +00001124 // Create branch weights based on the number of times we get here and the
1125 // number of times the condition should be true.
Bob Wilsonbf854f02014-02-17 19:21:09 +00001126 uint64_t CurrentCount = std::max(PGO.getCurrentRegionCount(), TrueCount);
Justin Bogneref512b92014-01-06 22:27:43 +00001127 llvm::MDNode *Weights = PGO.createBranchWeights(TrueCount,
1128 CurrentCount - TrueCount);
1129
Chris Lattnercd439292008-11-12 08:04:58 +00001130 // Emit the code with the fully general case.
1131 llvm::Value *CondV = EvaluateExprAsBool(Cond);
Justin Bogneref512b92014-01-06 22:27:43 +00001132 Builder.CreateCondBr(CondV, TrueBlock, FalseBlock, Weights);
Chris Lattnercd439292008-11-12 08:04:58 +00001133}
1134
Daniel Dunbara7c8cf62008-08-16 00:56:44 +00001135/// ErrorUnsupported - Print out an error that codegen doesn't support the
Chris Lattnerfc944342007-12-02 01:43:38 +00001136/// specified stmt yet.
David Blaikie4a9ec7b2013-08-19 21:02:26 +00001137void CodeGenFunction::ErrorUnsupported(const Stmt *S, const char *Type) {
1138 CGM.ErrorUnsupported(S, Type);
Chris Lattnerfc944342007-12-02 01:43:38 +00001139}
1140
John McCall2725aa12011-02-01 21:35:06 +00001141/// emitNonZeroVLAInit - Emit the "zero" initialization of a
1142/// variable-length array whose elements have a non-zero bit-pattern.
1143///
James Dennettbe302452012-06-15 22:10:14 +00001144/// \param baseType the inner-most element type of the array
John McCall2725aa12011-02-01 21:35:06 +00001145/// \param src - a char* pointing to the bit-pattern for a single
1146/// base element of the array
1147/// \param sizeInChars - the total size of the VLA, in chars
John McCall2725aa12011-02-01 21:35:06 +00001148static void emitNonZeroVLAInit(CodeGenFunction &CGF, QualType baseType,
Michael Ilseman686240a2012-12-04 00:29:55 +00001149 llvm::Value *dest, llvm::Value *src,
John McCall2725aa12011-02-01 21:35:06 +00001150 llvm::Value *sizeInChars) {
1151 std::pair<CharUnits,CharUnits> baseSizeAndAlign
1152 = CGF.getContext().getTypeInfoInChars(baseType);
1153
1154 CGBuilderTy &Builder = CGF.Builder;
1155
1156 llvm::Value *baseSizeInChars
1157 = llvm::ConstantInt::get(CGF.IntPtrTy, baseSizeAndAlign.first.getQuantity());
1158
Chris Lattner2192fe52011-07-18 04:24:23 +00001159 llvm::Type *i8p = Builder.getInt8PtrTy();
John McCall2725aa12011-02-01 21:35:06 +00001160
1161 llvm::Value *begin = Builder.CreateBitCast(dest, i8p, "vla.begin");
1162 llvm::Value *end = Builder.CreateInBoundsGEP(dest, sizeInChars, "vla.end");
1163
1164 llvm::BasicBlock *originBB = CGF.Builder.GetInsertBlock();
1165 llvm::BasicBlock *loopBB = CGF.createBasicBlock("vla-init.loop");
1166 llvm::BasicBlock *contBB = CGF.createBasicBlock("vla-init.cont");
1167
1168 // Make a loop over the VLA. C99 guarantees that the VLA element
1169 // count must be nonzero.
1170 CGF.EmitBlock(loopBB);
1171
Jay Foad20c0f022011-03-30 11:28:58 +00001172 llvm::PHINode *cur = Builder.CreatePHI(i8p, 2, "vla.cur");
John McCall2725aa12011-02-01 21:35:06 +00001173 cur->addIncoming(begin, originBB);
1174
1175 // memcpy the individual element bit-pattern.
1176 Builder.CreateMemCpy(cur, src, baseSizeInChars,
1177 baseSizeAndAlign.second.getQuantity(),
1178 /*volatile*/ false);
1179
1180 // Go to the next element.
1181 llvm::Value *next = Builder.CreateConstInBoundsGEP1_32(cur, 1, "vla.next");
1182
1183 // Leave if that's the end of the VLA.
1184 llvm::Value *done = Builder.CreateICmpEQ(next, end, "vla-init.isdone");
1185 Builder.CreateCondBr(done, contBB, loopBB);
1186 cur->addIncoming(next, loopBB);
1187
1188 CGF.EmitBlock(contBB);
Michael Ilseman686240a2012-12-04 00:29:55 +00001189}
John McCall2725aa12011-02-01 21:35:06 +00001190
Anders Carlssonc0964b62010-05-22 17:35:42 +00001191void
1192CodeGenFunction::EmitNullInitialization(llvm::Value *DestPtr, QualType Ty) {
Anders Carlsson16e94af2010-05-03 01:20:20 +00001193 // Ignore empty classes in C++.
Richard Smith9c6890a2012-11-01 22:30:59 +00001194 if (getLangOpts().CPlusPlus) {
Anders Carlsson16e94af2010-05-03 01:20:20 +00001195 if (const RecordType *RT = Ty->getAs<RecordType>()) {
1196 if (cast<CXXRecordDecl>(RT->getDecl())->isEmpty())
1197 return;
1198 }
1199 }
John McCall7cd1d972010-08-07 08:21:30 +00001200
1201 // Cast the dest ptr to the appropriate i8 pointer type.
1202 unsigned DestAS =
1203 cast<llvm::PointerType>(DestPtr->getType())->getAddressSpace();
Chris Lattner2192fe52011-07-18 04:24:23 +00001204 llvm::Type *BP = Builder.getInt8PtrTy(DestAS);
Anders Carlsson2e744e82008-08-30 19:51:14 +00001205 if (DestPtr->getType() != BP)
Benjamin Kramer76399eb2011-09-27 21:06:10 +00001206 DestPtr = Builder.CreateBitCast(DestPtr, BP);
Anders Carlsson2e744e82008-08-30 19:51:14 +00001207
1208 // Get size and alignment info for this aggregate.
Michael Ilseman686240a2012-12-04 00:29:55 +00001209 std::pair<CharUnits, CharUnits> TypeInfo =
Ken Dyckc5c416f2011-04-22 17:51:05 +00001210 getContext().getTypeInfoInChars(Ty);
1211 CharUnits Size = TypeInfo.first;
1212 CharUnits Align = TypeInfo.second;
Anders Carlsson2e744e82008-08-30 19:51:14 +00001213
John McCalla08ffd22011-01-14 10:37:58 +00001214 llvm::Value *SizeVal;
John McCall2725aa12011-02-01 21:35:06 +00001215 const VariableArrayType *vla;
Mike Stump11289f42009-09-09 15:08:12 +00001216
John McCalla08ffd22011-01-14 10:37:58 +00001217 // Don't bother emitting a zero-byte memset.
Ken Dyckc5c416f2011-04-22 17:51:05 +00001218 if (Size.isZero()) {
John McCalla08ffd22011-01-14 10:37:58 +00001219 // But note that getTypeInfo returns 0 for a VLA.
1220 if (const VariableArrayType *vlaType =
1221 dyn_cast_or_null<VariableArrayType>(
1222 getContext().getAsArrayType(Ty))) {
John McCall23c29fe2011-06-24 21:55:10 +00001223 QualType eltType;
1224 llvm::Value *numElts;
Benjamin Kramer867ea1d2014-03-02 13:01:17 +00001225 std::tie(numElts, eltType) = getVLASize(vlaType);
John McCall23c29fe2011-06-24 21:55:10 +00001226
1227 SizeVal = numElts;
1228 CharUnits eltSize = getContext().getTypeSizeInChars(eltType);
1229 if (!eltSize.isOne())
1230 SizeVal = Builder.CreateNUWMul(SizeVal, CGM.getSize(eltSize));
John McCall2725aa12011-02-01 21:35:06 +00001231 vla = vlaType;
John McCalla08ffd22011-01-14 10:37:58 +00001232 } else {
1233 return;
1234 }
1235 } else {
John McCall23c29fe2011-06-24 21:55:10 +00001236 SizeVal = CGM.getSize(Size);
John McCall2725aa12011-02-01 21:35:06 +00001237 vla = 0;
John McCalla08ffd22011-01-14 10:37:58 +00001238 }
John McCall7cd1d972010-08-07 08:21:30 +00001239
1240 // If the type contains a pointer to data member we can't memset it to zero.
1241 // Instead, create a null constant and copy it to the destination.
John McCall2725aa12011-02-01 21:35:06 +00001242 // TODO: there are other patterns besides zero that we can usefully memset,
1243 // like -1, which happens to be the pattern used by member-pointers.
John McCall614dbdc2010-08-22 21:01:12 +00001244 if (!CGM.getTypes().isZeroInitializable(Ty)) {
John McCall2725aa12011-02-01 21:35:06 +00001245 // For a VLA, emit a single element, then splat that over the VLA.
1246 if (vla) Ty = getContext().getBaseElementType(vla);
John McCalla08ffd22011-01-14 10:37:58 +00001247
John McCall7cd1d972010-08-07 08:21:30 +00001248 llvm::Constant *NullConstant = CGM.EmitNullConstant(Ty);
1249
Michael Ilseman686240a2012-12-04 00:29:55 +00001250 llvm::GlobalVariable *NullVariable =
John McCall7cd1d972010-08-07 08:21:30 +00001251 new llvm::GlobalVariable(CGM.getModule(), NullConstant->getType(),
Michael Ilseman686240a2012-12-04 00:29:55 +00001252 /*isConstant=*/true,
John McCall7cd1d972010-08-07 08:21:30 +00001253 llvm::GlobalVariable::PrivateLinkage,
Chris Lattner0e62c1c2011-07-23 10:55:15 +00001254 NullConstant, Twine());
John McCall7cd1d972010-08-07 08:21:30 +00001255 llvm::Value *SrcPtr =
1256 Builder.CreateBitCast(NullVariable, Builder.getInt8PtrTy());
1257
John McCall2725aa12011-02-01 21:35:06 +00001258 if (vla) return emitNonZeroVLAInit(*this, Ty, DestPtr, SrcPtr, SizeVal);
1259
John McCall7cd1d972010-08-07 08:21:30 +00001260 // Get and call the appropriate llvm.memcpy overload.
Ken Dyckc5c416f2011-04-22 17:51:05 +00001261 Builder.CreateMemCpy(DestPtr, SrcPtr, SizeVal, Align.getQuantity(), false);
John McCall7cd1d972010-08-07 08:21:30 +00001262 return;
Michael Ilseman686240a2012-12-04 00:29:55 +00001263 }
1264
John McCall7cd1d972010-08-07 08:21:30 +00001265 // Otherwise, just memset the whole thing to zero. This is legal
1266 // because in LLVM, all default initializers (other than the ones we just
1267 // handled above) are guaranteed to have a bit pattern of all zeros.
Michael Ilseman686240a2012-12-04 00:29:55 +00001268 Builder.CreateMemSet(DestPtr, Builder.getInt8(0), SizeVal,
Ken Dyckc5c416f2011-04-22 17:51:05 +00001269 Align.getQuantity(), false);
Anders Carlsson2e744e82008-08-30 19:51:14 +00001270}
1271
Chris Lattnerc8e630e2011-02-17 07:39:24 +00001272llvm::BlockAddress *CodeGenFunction::GetAddrOfLabel(const LabelDecl *L) {
Chris Lattner6c4d2552009-10-28 23:59:40 +00001273 // Make sure that there is a block for the indirect goto.
1274 if (IndirectBranch == 0)
1275 GetIndirectGotoBlock();
Michael Ilseman686240a2012-12-04 00:29:55 +00001276
John McCallad5d61e2010-07-23 21:56:41 +00001277 llvm::BasicBlock *BB = getJumpDestForLabel(L).getBlock();
Michael Ilseman686240a2012-12-04 00:29:55 +00001278
Chris Lattner6c4d2552009-10-28 23:59:40 +00001279 // Make sure the indirect branch includes all of the address-taken blocks.
1280 IndirectBranch->addDestination(BB);
1281 return llvm::BlockAddress::get(CurFn, BB);
Chris Lattner2bb5cb42009-10-13 06:55:33 +00001282}
1283
1284llvm::BasicBlock *CodeGenFunction::GetIndirectGotoBlock() {
Chris Lattner6c4d2552009-10-28 23:59:40 +00001285 // If we already made the indirect branch for indirect goto, return its block.
1286 if (IndirectBranch) return IndirectBranch->getParent();
Michael Ilseman686240a2012-12-04 00:29:55 +00001287
Chris Lattner6c4d2552009-10-28 23:59:40 +00001288 CGBuilderTy TmpBuilder(createBasicBlock("indirectgoto"));
Michael Ilseman686240a2012-12-04 00:29:55 +00001289
Chris Lattner2bb5cb42009-10-13 06:55:33 +00001290 // Create the PHI node that indirect gotos will add entries to.
Jay Foad20c0f022011-03-30 11:28:58 +00001291 llvm::Value *DestVal = TmpBuilder.CreatePHI(Int8PtrTy, 0,
1292 "indirect.goto.dest");
Michael Ilseman686240a2012-12-04 00:29:55 +00001293
Chris Lattner6c4d2552009-10-28 23:59:40 +00001294 // Create the indirect branch instruction.
1295 IndirectBranch = TmpBuilder.CreateIndirectBr(DestVal);
1296 return IndirectBranch->getParent();
Daniel Dunbar88402ce2008-08-04 16:51:22 +00001297}
Anders Carlsson13abd7e2008-11-04 05:30:00 +00001298
John McCall82fe67b2011-07-09 01:37:26 +00001299/// Computes the length of an array in elements, as well as the base
1300/// element type and a properly-typed first element pointer.
1301llvm::Value *CodeGenFunction::emitArrayLength(const ArrayType *origArrayType,
1302 QualType &baseType,
1303 llvm::Value *&addr) {
1304 const ArrayType *arrayType = origArrayType;
1305
1306 // If it's a VLA, we have to load the stored size. Note that
1307 // this is the size of the VLA in bytes, not its size in elements.
1308 llvm::Value *numVLAElements = 0;
1309 if (isa<VariableArrayType>(arrayType)) {
1310 numVLAElements = getVLASize(cast<VariableArrayType>(arrayType)).first;
1311
1312 // Walk into all VLAs. This doesn't require changes to addr,
1313 // which has type T* where T is the first non-VLA element type.
1314 do {
1315 QualType elementType = arrayType->getElementType();
1316 arrayType = getContext().getAsArrayType(elementType);
1317
1318 // If we only have VLA components, 'addr' requires no adjustment.
1319 if (!arrayType) {
1320 baseType = elementType;
1321 return numVLAElements;
1322 }
1323 } while (isa<VariableArrayType>(arrayType));
1324
1325 // We get out here only if we find a constant array type
1326 // inside the VLA.
1327 }
1328
1329 // We have some number of constant-length arrays, so addr should
1330 // have LLVM type [M x [N x [...]]]*. Build a GEP that walks
1331 // down to the first element of addr.
Chris Lattner0e62c1c2011-07-23 10:55:15 +00001332 SmallVector<llvm::Value*, 8> gepIndices;
John McCall82fe67b2011-07-09 01:37:26 +00001333
1334 // GEP down to the array type.
1335 llvm::ConstantInt *zero = Builder.getInt32(0);
1336 gepIndices.push_back(zero);
1337
John McCall82fe67b2011-07-09 01:37:26 +00001338 uint64_t countFromCLAs = 1;
Richard Smithf3c37e82012-04-22 05:51:36 +00001339 QualType eltType;
John McCall82fe67b2011-07-09 01:37:26 +00001340
Chris Lattner2192fe52011-07-18 04:24:23 +00001341 llvm::ArrayType *llvmArrayType =
Richard Smithf3c37e82012-04-22 05:51:36 +00001342 dyn_cast<llvm::ArrayType>(
John McCall82fe67b2011-07-09 01:37:26 +00001343 cast<llvm::PointerType>(addr->getType())->getElementType());
Richard Smithf3c37e82012-04-22 05:51:36 +00001344 while (llvmArrayType) {
John McCall82fe67b2011-07-09 01:37:26 +00001345 assert(isa<ConstantArrayType>(arrayType));
1346 assert(cast<ConstantArrayType>(arrayType)->getSize().getZExtValue()
1347 == llvmArrayType->getNumElements());
1348
1349 gepIndices.push_back(zero);
1350 countFromCLAs *= llvmArrayType->getNumElements();
Richard Smithf3c37e82012-04-22 05:51:36 +00001351 eltType = arrayType->getElementType();
John McCall82fe67b2011-07-09 01:37:26 +00001352
1353 llvmArrayType =
1354 dyn_cast<llvm::ArrayType>(llvmArrayType->getElementType());
John McCall82fe67b2011-07-09 01:37:26 +00001355 arrayType = getContext().getAsArrayType(arrayType->getElementType());
Richard Smithf3c37e82012-04-22 05:51:36 +00001356 assert((!llvmArrayType || arrayType) &&
1357 "LLVM and Clang types are out-of-synch");
John McCall82fe67b2011-07-09 01:37:26 +00001358 }
1359
Richard Smithf3c37e82012-04-22 05:51:36 +00001360 if (arrayType) {
1361 // From this point onwards, the Clang array type has been emitted
1362 // as some other type (probably a packed struct). Compute the array
1363 // size, and just emit the 'begin' expression as a bitcast.
1364 while (arrayType) {
1365 countFromCLAs *=
1366 cast<ConstantArrayType>(arrayType)->getSize().getZExtValue();
1367 eltType = arrayType->getElementType();
1368 arrayType = getContext().getAsArrayType(eltType);
1369 }
John McCall82fe67b2011-07-09 01:37:26 +00001370
Micah Villmowea2fea22012-10-25 15:39:14 +00001371 unsigned AddressSpace = addr->getType()->getPointerAddressSpace();
Richard Smithf3c37e82012-04-22 05:51:36 +00001372 llvm::Type *BaseType = ConvertType(eltType)->getPointerTo(AddressSpace);
1373 addr = Builder.CreateBitCast(addr, BaseType, "array.begin");
1374 } else {
1375 // Create the actual GEP.
1376 addr = Builder.CreateInBoundsGEP(addr, gepIndices, "array.begin");
1377 }
1378
1379 baseType = eltType;
John McCall82fe67b2011-07-09 01:37:26 +00001380
1381 llvm::Value *numElements
1382 = llvm::ConstantInt::get(SizeTy, countFromCLAs);
1383
1384 // If we had any VLA dimensions, factor them in.
1385 if (numVLAElements)
1386 numElements = Builder.CreateNUWMul(numVLAElements, numElements);
1387
1388 return numElements;
1389}
1390
John McCall23c29fe2011-06-24 21:55:10 +00001391std::pair<llvm::Value*, QualType>
1392CodeGenFunction::getVLASize(QualType type) {
1393 const VariableArrayType *vla = getContext().getAsVariableArrayType(type);
1394 assert(vla && "type was not a variable array type!");
1395 return getVLASize(vla);
Anders Carlssone388a5b2008-12-20 20:27:15 +00001396}
Anders Carlssonccbe9202008-12-12 07:19:02 +00001397
John McCall23c29fe2011-06-24 21:55:10 +00001398std::pair<llvm::Value*, QualType>
1399CodeGenFunction::getVLASize(const VariableArrayType *type) {
1400 // The number of elements so far; always size_t.
1401 llvm::Value *numElements = 0;
1402
1403 QualType elementType;
1404 do {
1405 elementType = type->getElementType();
1406 llvm::Value *vlaSize = VLASizeMap[type->getSizeExpr()];
1407 assert(vlaSize && "no size for VLA!");
1408 assert(vlaSize->getType() == SizeTy);
1409
1410 if (!numElements) {
1411 numElements = vlaSize;
1412 } else {
1413 // It's undefined behavior if this wraps around, so mark it that way.
Alexey Samsonovcb3f8122014-03-20 10:48:29 +00001414 // FIXME: Teach -fsanitize=undefined to trap this.
John McCall23c29fe2011-06-24 21:55:10 +00001415 numElements = Builder.CreateNUWMul(numElements, vlaSize);
1416 }
1417 } while ((type = getContext().getAsVariableArrayType(elementType)));
1418
1419 return std::pair<llvm::Value*,QualType>(numElements, elementType);
1420}
1421
1422void CodeGenFunction::EmitVariablyModifiedType(QualType type) {
1423 assert(type->isVariablyModifiedType() &&
Anders Carlsson8a01b792008-12-20 20:46:34 +00001424 "Must pass variably modified type to EmitVLASizes!");
Mike Stump11289f42009-09-09 15:08:12 +00001425
Daniel Dunbarb6adc432009-07-19 06:58:07 +00001426 EnsureInsertPoint();
Mike Stump11289f42009-09-09 15:08:12 +00001427
John McCall23c29fe2011-06-24 21:55:10 +00001428 // We're going to walk down into the type and look for VLA
1429 // expressions.
John McCall23c29fe2011-06-24 21:55:10 +00001430 do {
1431 assert(type->isVariablyModifiedType());
Mike Stump11289f42009-09-09 15:08:12 +00001432
John McCall23c29fe2011-06-24 21:55:10 +00001433 const Type *ty = type.getTypePtr();
1434 switch (ty->getTypeClass()) {
Abramo Bagnara1cd83682012-01-07 10:52:36 +00001435
John McCall23c29fe2011-06-24 21:55:10 +00001436#define TYPE(Class, Base)
1437#define ABSTRACT_TYPE(Class, Base)
Abramo Bagnara1cd83682012-01-07 10:52:36 +00001438#define NON_CANONICAL_TYPE(Class, Base)
John McCall23c29fe2011-06-24 21:55:10 +00001439#define DEPENDENT_TYPE(Class, Base) case Type::Class:
Abramo Bagnara1cd83682012-01-07 10:52:36 +00001440#define NON_CANONICAL_UNLESS_DEPENDENT_TYPE(Class, Base)
John McCall23c29fe2011-06-24 21:55:10 +00001441#include "clang/AST/TypeNodes.def"
Abramo Bagnara1cd83682012-01-07 10:52:36 +00001442 llvm_unreachable("unexpected dependent type!");
Mike Stump11289f42009-09-09 15:08:12 +00001443
John McCall23c29fe2011-06-24 21:55:10 +00001444 // These types are never variably-modified.
1445 case Type::Builtin:
1446 case Type::Complex:
1447 case Type::Vector:
1448 case Type::ExtVector:
1449 case Type::Record:
1450 case Type::Enum:
Abramo Bagnarafa95ed42012-01-11 08:19:46 +00001451 case Type::Elaborated:
1452 case Type::TemplateSpecialization:
John McCall23c29fe2011-06-24 21:55:10 +00001453 case Type::ObjCObject:
1454 case Type::ObjCInterface:
1455 case Type::ObjCObjectPointer:
1456 llvm_unreachable("type class is never variably-modified!");
Mike Stump11289f42009-09-09 15:08:12 +00001457
Reid Kleckner0503a872013-12-05 01:23:43 +00001458 case Type::Adjusted:
1459 type = cast<AdjustedType>(ty)->getAdjustedType();
1460 break;
1461
Reid Kleckner8a365022013-06-24 17:51:48 +00001462 case Type::Decayed:
1463 type = cast<DecayedType>(ty)->getPointeeType();
1464 break;
1465
John McCall23c29fe2011-06-24 21:55:10 +00001466 case Type::Pointer:
1467 type = cast<PointerType>(ty)->getPointeeType();
1468 break;
Mike Stump11289f42009-09-09 15:08:12 +00001469
John McCall23c29fe2011-06-24 21:55:10 +00001470 case Type::BlockPointer:
1471 type = cast<BlockPointerType>(ty)->getPointeeType();
1472 break;
1473
1474 case Type::LValueReference:
1475 case Type::RValueReference:
1476 type = cast<ReferenceType>(ty)->getPointeeType();
1477 break;
1478
1479 case Type::MemberPointer:
1480 type = cast<MemberPointerType>(ty)->getPointeeType();
1481 break;
1482
1483 case Type::ConstantArray:
1484 case Type::IncompleteArray:
1485 // Losing element qualification here is fine.
1486 type = cast<ArrayType>(ty)->getElementType();
1487 break;
1488
1489 case Type::VariableArray: {
1490 // Losing element qualification here is fine.
1491 const VariableArrayType *vat = cast<VariableArrayType>(ty);
1492
1493 // Unknown size indication requires no size computation.
1494 // Otherwise, evaluate and record it.
1495 if (const Expr *size = vat->getSizeExpr()) {
1496 // It's possible that we might have emitted this already,
1497 // e.g. with a typedef and a pointer to it.
1498 llvm::Value *&entry = VLASizeMap[size];
1499 if (!entry) {
Richard Smith481652b2012-10-10 01:11:12 +00001500 llvm::Value *Size = EmitScalarExpr(size);
1501
1502 // C11 6.7.6.2p5:
1503 // If the size is an expression that is not an integer constant
1504 // expression [...] each time it is evaluated it shall have a value
1505 // greater than zero.
Will Dietzf54319c2013-01-18 11:30:38 +00001506 if (SanOpts->VLABound &&
Richard Smithb1b0ab42012-11-05 22:21:05 +00001507 size->getType()->isSignedIntegerType()) {
Richard Smith481652b2012-10-10 01:11:12 +00001508 llvm::Value *Zero = llvm::Constant::getNullValue(Size->getType());
1509 llvm::Constant *StaticArgs[] = {
1510 EmitCheckSourceLocation(size->getLocStart()),
1511 EmitCheckTypeDescriptor(size->getType())
1512 };
1513 EmitCheck(Builder.CreateICmpSGT(Size, Zero),
Will Dietz88e02332012-12-02 19:50:33 +00001514 "vla_bound_not_positive", StaticArgs, Size,
1515 CRK_Recoverable);
Richard Smith481652b2012-10-10 01:11:12 +00001516 }
1517
John McCall23c29fe2011-06-24 21:55:10 +00001518 // Always zexting here would be wrong if it weren't
1519 // undefined behavior to have a negative bound.
Richard Smith8772bd82012-10-10 01:12:11 +00001520 entry = Builder.CreateIntCast(Size, SizeTy, /*signed*/ false);
John McCall23c29fe2011-06-24 21:55:10 +00001521 }
1522 }
1523 type = vat->getElementType();
1524 break;
Anders Carlsson8a01b792008-12-20 20:46:34 +00001525 }
Mike Stump11289f42009-09-09 15:08:12 +00001526
Abramo Bagnara1cd83682012-01-07 10:52:36 +00001527 case Type::FunctionProto:
John McCall23c29fe2011-06-24 21:55:10 +00001528 case Type::FunctionNoProto:
Alp Toker314cc812014-01-25 16:55:45 +00001529 type = cast<FunctionType>(ty)->getReturnType();
John McCall23c29fe2011-06-24 21:55:10 +00001530 break;
Eli Friedman0dfb8892011-10-06 23:00:33 +00001531
Abramo Bagnarafa95ed42012-01-11 08:19:46 +00001532 case Type::Paren:
1533 case Type::TypeOf:
1534 case Type::UnaryTransform:
1535 case Type::Attributed:
1536 case Type::SubstTemplateTypeParm:
David Blaikie66ed89d2013-07-13 21:08:08 +00001537 case Type::PackExpansion:
Abramo Bagnarafa95ed42012-01-11 08:19:46 +00001538 // Keep walking after single level desugaring.
1539 type = type.getSingleStepDesugaredType(getContext());
1540 break;
1541
1542 case Type::Typedef:
1543 case Type::Decltype:
1544 case Type::Auto:
1545 // Stop walking: nothing to do.
1546 return;
1547
1548 case Type::TypeOfExpr:
1549 // Stop walking: emit typeof expression.
1550 EmitIgnoredExpr(cast<TypeOfExprType>(ty)->getUnderlyingExpr());
1551 return;
1552
Eli Friedman0dfb8892011-10-06 23:00:33 +00001553 case Type::Atomic:
1554 type = cast<AtomicType>(ty)->getValueType();
1555 break;
John McCall23c29fe2011-06-24 21:55:10 +00001556 }
1557 } while (type->isVariablyModifiedType());
Anders Carlssonccbe9202008-12-12 07:19:02 +00001558}
Eli Friedmanddea0ad2009-01-20 17:46:04 +00001559
1560llvm::Value* CodeGenFunction::EmitVAListRef(const Expr* E) {
Dan Gohmane9e32dc2010-10-29 22:47:07 +00001561 if (getContext().getBuiltinVaListType()->isArrayType())
Eli Friedmanddea0ad2009-01-20 17:46:04 +00001562 return EmitScalarExpr(E);
Eli Friedmanddea0ad2009-01-20 17:46:04 +00001563 return EmitLValue(E).getAddress();
1564}
Anders Carlsson15cb75a2009-02-07 22:53:43 +00001565
Yunzhong Gao0ebf1bb2013-08-30 08:53:09 +00001566void CodeGenFunction::EmitDeclRefExprDbgValue(const DeclRefExpr *E,
1567 llvm::Constant *Init) {
Devang Pateldc866e12010-08-10 17:53:33 +00001568 assert (Init && "Invalid DeclRefExpr initializer!");
Yunzhong Gao0ebf1bb2013-08-30 08:53:09 +00001569 if (CGDebugInfo *Dbg = getDebugInfo())
1570 if (CGM.getCodeGenOpts().getDebugInfo() >= CodeGenOptions::LimitedDebugInfo)
1571 Dbg->EmitGlobalVariable(E->getDecl(), Init);
Devang Patele03edfd2010-08-10 07:24:25 +00001572}
John McCallc07a0c72011-02-17 10:25:35 +00001573
1574CodeGenFunction::PeepholeProtection
1575CodeGenFunction::protectFromPeepholes(RValue rvalue) {
1576 // At the moment, the only aggressive peephole we do in IR gen
1577 // is trunc(zext) folding, but if we add more, we can easily
1578 // extend this protection.
1579
1580 if (!rvalue.isScalar()) return PeepholeProtection();
1581 llvm::Value *value = rvalue.getScalarVal();
1582 if (!isa<llvm::ZExtInst>(value)) return PeepholeProtection();
1583
1584 // Just make an extra bitcast.
1585 assert(HaveInsertPoint());
1586 llvm::Instruction *inst = new llvm::BitCastInst(value, value->getType(), "",
1587 Builder.GetInsertBlock());
1588
1589 PeepholeProtection protection;
1590 protection.Inst = inst;
1591 return protection;
1592}
1593
1594void CodeGenFunction::unprotectFromPeepholes(PeepholeProtection protection) {
1595 if (!protection.Inst) return;
1596
1597 // In theory, we could try to duplicate the peepholes now, but whatever.
1598 protection.Inst->eraseFromParent();
1599}
Julien Lerouge5a6b6982011-09-09 22:41:49 +00001600
1601llvm::Value *CodeGenFunction::EmitAnnotationCall(llvm::Value *AnnotationFn,
1602 llvm::Value *AnnotatedVal,
Dmitri Gribenkof8579502013-01-12 19:30:44 +00001603 StringRef AnnotationStr,
Julien Lerouge5a6b6982011-09-09 22:41:49 +00001604 SourceLocation Location) {
1605 llvm::Value *Args[4] = {
1606 AnnotatedVal,
1607 Builder.CreateBitCast(CGM.EmitAnnotationString(AnnotationStr), Int8PtrTy),
1608 Builder.CreateBitCast(CGM.EmitAnnotationUnit(Location), Int8PtrTy),
1609 CGM.EmitAnnotationLineNo(Location)
1610 };
1611 return Builder.CreateCall(AnnotationFn, Args);
1612}
1613
1614void CodeGenFunction::EmitVarAnnotations(const VarDecl *D, llvm::Value *V) {
1615 assert(D->hasAttr<AnnotateAttr>() && "no annotate attribute");
1616 // FIXME We create a new bitcast for every annotation because that's what
1617 // llvm-gcc was doing.
Aaron Ballmanbe22bcb2014-03-10 17:08:28 +00001618 for (const auto *I : D->specific_attrs<AnnotateAttr>())
Julien Lerouge5a6b6982011-09-09 22:41:49 +00001619 EmitAnnotationCall(CGM.getIntrinsic(llvm::Intrinsic::var_annotation),
1620 Builder.CreateBitCast(V, CGM.Int8PtrTy, V->getName()),
Aaron Ballmanbe22bcb2014-03-10 17:08:28 +00001621 I->getAnnotation(), D->getLocation());
Julien Lerouge5a6b6982011-09-09 22:41:49 +00001622}
1623
1624llvm::Value *CodeGenFunction::EmitFieldAnnotations(const FieldDecl *D,
1625 llvm::Value *V) {
1626 assert(D->hasAttr<AnnotateAttr>() && "no annotate attribute");
1627 llvm::Type *VTy = V->getType();
1628 llvm::Value *F = CGM.getIntrinsic(llvm::Intrinsic::ptr_annotation,
1629 CGM.Int8PtrTy);
1630
Aaron Ballmanbe22bcb2014-03-10 17:08:28 +00001631 for (const auto *I : D->specific_attrs<AnnotateAttr>()) {
Julien Lerouge5a6b6982011-09-09 22:41:49 +00001632 // FIXME Always emit the cast inst so we can differentiate between
1633 // annotation on the first field of a struct and annotation on the struct
1634 // itself.
1635 if (VTy != CGM.Int8PtrTy)
1636 V = Builder.Insert(new llvm::BitCastInst(V, CGM.Int8PtrTy));
Aaron Ballmanbe22bcb2014-03-10 17:08:28 +00001637 V = EmitAnnotationCall(F, V, I->getAnnotation(), D->getLocation());
Julien Lerouge5a6b6982011-09-09 22:41:49 +00001638 V = Builder.CreateBitCast(V, VTy);
1639 }
1640
1641 return V;
1642}
Ben Langmuir3b4c30b2013-05-09 19:17:11 +00001643
1644CodeGenFunction::CGCapturedStmtInfo::~CGCapturedStmtInfo() { }