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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"
Chandler Carruth3a022472012-12-04 09:13:33 +000018#include "CodeGenModule.h"
Justin Bogneref512b92014-01-06 22:27:43 +000019#include "CodeGenPGO.h"
Peter Collingbourneb453cd62013-10-20 21:29:19 +000020#include "TargetInfo.h"
Daniel Dunbarad319a72008-08-11 05:00:27 +000021#include "clang/AST/ASTContext.h"
Daniel Dunbar6e8aa532008-08-11 05:35:13 +000022#include "clang/AST/Decl.h"
Anders Carlsson468fa632009-04-04 20:47:02 +000023#include "clang/AST/DeclCXX.h"
Mike Stumpbee78dd2009-12-04 23:26:17 +000024#include "clang/AST/StmtCXX.h"
Guy Benyeifb36ede2013-03-24 13:58:12 +000025#include "clang/Basic/OpenCL.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);
76}
77
Chris Lattnerd1af2d22007-05-29 23:17:50 +000078
Chris Lattnera5f58b02011-07-09 17:41:47 +000079llvm::Type *CodeGenFunction::ConvertTypeForMem(QualType T) {
Daniel Dunbaree3da872009-02-03 23:03:55 +000080 return CGM.getTypes().ConvertTypeForMem(T);
81}
82
Chris Lattnera5f58b02011-07-09 17:41:47 +000083llvm::Type *CodeGenFunction::ConvertType(QualType T) {
Chris Lattnerf033c142007-06-22 19:05:19 +000084 return CGM.getTypes().ConvertType(T);
Chris Lattner45bb9142007-06-09 02:28:57 +000085}
Chris Lattnerd1af2d22007-05-29 23:17:50 +000086
John McCall47fb9502013-03-07 21:37:08 +000087TypeEvaluationKind CodeGenFunction::getEvaluationKind(QualType type) {
88 type = type.getCanonicalType();
89 while (true) {
90 switch (type->getTypeClass()) {
John McCall745ae282011-05-15 02:34:36 +000091#define TYPE(name, parent)
92#define ABSTRACT_TYPE(name, parent)
93#define NON_CANONICAL_TYPE(name, parent) case Type::name:
94#define DEPENDENT_TYPE(name, parent) case Type::name:
95#define NON_CANONICAL_UNLESS_DEPENDENT_TYPE(name, parent) case Type::name:
96#include "clang/AST/TypeNodes.def"
John McCall47fb9502013-03-07 21:37:08 +000097 llvm_unreachable("non-canonical or dependent type in IR-generation");
John McCall745ae282011-05-15 02:34:36 +000098
Richard Smith27d807c2013-04-30 13:56:41 +000099 case Type::Auto:
100 llvm_unreachable("undeduced auto type in IR-generation");
101
John McCall47fb9502013-03-07 21:37:08 +0000102 // Various scalar types.
103 case Type::Builtin:
104 case Type::Pointer:
105 case Type::BlockPointer:
106 case Type::LValueReference:
107 case Type::RValueReference:
108 case Type::MemberPointer:
109 case Type::Vector:
110 case Type::ExtVector:
111 case Type::FunctionProto:
112 case Type::FunctionNoProto:
113 case Type::Enum:
114 case Type::ObjCObjectPointer:
115 return TEK_Scalar;
John McCall745ae282011-05-15 02:34:36 +0000116
John McCall47fb9502013-03-07 21:37:08 +0000117 // Complexes.
118 case Type::Complex:
119 return TEK_Complex;
Eli Friedman0dfb8892011-10-06 23:00:33 +0000120
John McCall47fb9502013-03-07 21:37:08 +0000121 // Arrays, records, and Objective-C objects.
122 case Type::ConstantArray:
123 case Type::IncompleteArray:
124 case Type::VariableArray:
125 case Type::Record:
126 case Type::ObjCObject:
127 case Type::ObjCInterface:
128 return TEK_Aggregate;
129
130 // We operate on atomic values according to their underlying type.
131 case Type::Atomic:
132 type = cast<AtomicType>(type)->getValueType();
133 continue;
134 }
135 llvm_unreachable("unknown type kind!");
John McCall745ae282011-05-15 02:34:36 +0000136 }
Chris Lattner54fb19e2007-06-22 22:02:34 +0000137}
138
David Blaikie357aafb2013-02-01 19:09:49 +0000139void CodeGenFunction::EmitReturnBlock() {
Daniel Dunbarfd346a32009-01-26 23:27:52 +0000140 // For cleanliness, we try to avoid emitting the return block for
141 // simple cases.
142 llvm::BasicBlock *CurBB = Builder.GetInsertBlock();
143
144 if (CurBB) {
145 assert(!CurBB->getTerminator() && "Unexpected terminated block.");
146
Daniel Dunbarea3060a2009-07-19 08:24:34 +0000147 // We have a valid insert point, reuse it if it is empty or there are no
148 // explicit jumps to the return block.
John McCallad5d61e2010-07-23 21:56:41 +0000149 if (CurBB->empty() || ReturnBlock.getBlock()->use_empty()) {
150 ReturnBlock.getBlock()->replaceAllUsesWith(CurBB);
151 delete ReturnBlock.getBlock();
Daniel Dunbarea3060a2009-07-19 08:24:34 +0000152 } else
John McCallad5d61e2010-07-23 21:56:41 +0000153 EmitBlock(ReturnBlock.getBlock());
David Blaikie357aafb2013-02-01 19:09:49 +0000154 return;
Daniel Dunbarfd346a32009-01-26 23:27:52 +0000155 }
156
157 // Otherwise, if the return block is the target of a single direct
158 // branch then we can just put the code in that block instead. This
159 // cleans up functions which started with a unified return block.
John McCallad5d61e2010-07-23 21:56:41 +0000160 if (ReturnBlock.getBlock()->hasOneUse()) {
Mike Stump11289f42009-09-09 15:08:12 +0000161 llvm::BranchInst *BI =
John McCallad5d61e2010-07-23 21:56:41 +0000162 dyn_cast<llvm::BranchInst>(*ReturnBlock.getBlock()->use_begin());
John McCallbd309292010-07-06 01:34:17 +0000163 if (BI && BI->isUnconditional() &&
John McCallad5d61e2010-07-23 21:56:41 +0000164 BI->getSuccessor(0) == ReturnBlock.getBlock()) {
David Blaikie1d969f42013-02-23 19:20:56 +0000165 // Reset insertion point, including debug location, and delete the
166 // branch. This is really subtle and only works because the next change
167 // in location will hit the caching in CGDebugInfo::EmitLocation and not
168 // override this.
Eric Christopher65c5c912011-09-09 21:53:04 +0000169 Builder.SetCurrentDebugLocation(BI->getDebugLoc());
Daniel Dunbarfd346a32009-01-26 23:27:52 +0000170 Builder.SetInsertPoint(BI->getParent());
171 BI->eraseFromParent();
John McCallad5d61e2010-07-23 21:56:41 +0000172 delete ReturnBlock.getBlock();
David Blaikie357aafb2013-02-01 19:09:49 +0000173 return;
Daniel Dunbarfd346a32009-01-26 23:27:52 +0000174 }
175 }
176
Mike Stump18bb9282009-05-16 07:57:57 +0000177 // FIXME: We are at an unreachable point, there is no reason to emit the block
178 // unless it has uses. However, we still need a place to put the debug
179 // region.end for now.
Daniel Dunbarfd346a32009-01-26 23:27:52 +0000180
John McCallad5d61e2010-07-23 21:56:41 +0000181 EmitBlock(ReturnBlock.getBlock());
John McCallbd309292010-07-06 01:34:17 +0000182}
183
184static void EmitIfUsed(CodeGenFunction &CGF, llvm::BasicBlock *BB) {
185 if (!BB) return;
186 if (!BB->use_empty())
187 return CGF.CurFn->getBasicBlockList().push_back(BB);
188 delete BB;
Daniel Dunbarfd346a32009-01-26 23:27:52 +0000189}
190
Daniel Dunbar89654ee2008-08-26 08:29:31 +0000191void CodeGenFunction::FinishFunction(SourceLocation EndLoc) {
Chris Lattnere73e4322007-07-16 21:28:45 +0000192 assert(BreakContinueStack.empty() &&
193 "mismatched push/pop in break/continue stack!");
Mike Stump11289f42009-09-09 15:08:12 +0000194
Adrian Prantl52bf3c42013-05-03 20:11:48 +0000195 bool OnlySimpleReturnStmts = NumSimpleReturnExprs > 0
Adrian Prantl524ba1f2013-07-25 00:23:42 +0000196 && NumSimpleReturnExprs == NumReturnExprs
197 && ReturnBlock.getBlock()->use_empty();
198 // Usually the return expression is evaluated before the cleanup
199 // code. If the function contains only a simple return statement,
200 // such as a constant, the location before the cleanup code becomes
201 // the last useful breakpoint in the function, because the simple
202 // return expression will be evaluated after the cleanup code. To be
203 // safe, set the debug location for cleanup code to the location of
204 // the return statement. Otherwise the cleanup code should be at the
205 // end of the function's lexical scope.
206 //
207 // If there are multiple branches to the return block, the branch
208 // instructions will get the location of the return statements and
209 // all will be fine.
Adrian Prantl3be10542013-05-02 17:30:20 +0000210 if (CGDebugInfo *DI = getDebugInfo()) {
Adrian Prantl52bf3c42013-05-03 20:11:48 +0000211 if (OnlySimpleReturnStmts)
Adrian Prantl96e70d92014-01-03 23:34:30 +0000212 DI->EmitLocation(Builder, LastStopPoint.first,
213 false, LastStopPoint.second);
Adrian Prantl3be10542013-05-02 17:30:20 +0000214 else
Adrian Prantl96e70d92014-01-03 23:34:30 +0000215 DI->EmitLocation(Builder, EndLoc, false, LastStopPoint.second);
Adrian Prantl3be10542013-05-02 17:30:20 +0000216 }
David Blaikie357aafb2013-02-01 19:09:49 +0000217
John McCall31168b02011-06-15 23:02:42 +0000218 // Pop any cleanups that might have been associated with the
219 // parameters. Do this in whatever block we're currently in; it's
220 // important to do this before we enter the return block or return
221 // edges will be *really* confused.
Adrian Prantl3be10542013-05-02 17:30:20 +0000222 bool EmitRetDbgLoc = true;
223 if (EHStack.stable_begin() != PrologueCleanupDepth) {
Adrian Prantldc237b52013-05-16 00:41:26 +0000224 PopCleanupBlocks(PrologueCleanupDepth);
John McCall31168b02011-06-15 23:02:42 +0000225
Adrian Prantl3be10542013-05-02 17:30:20 +0000226 // Make sure the line table doesn't jump back into the body for
227 // the ret after it's been at EndLoc.
228 EmitRetDbgLoc = false;
229
230 if (CGDebugInfo *DI = getDebugInfo())
Adrian Prantl52bf3c42013-05-03 20:11:48 +0000231 if (OnlySimpleReturnStmts)
Adrian Prantl96e70d92014-01-03 23:34:30 +0000232 DI->EmitLocation(Builder, EndLoc, false, LastStopPoint.second);
Adrian Prantl3be10542013-05-02 17:30:20 +0000233 }
234
Mike Stump11289f42009-09-09 15:08:12 +0000235 // Emit function epilog (to return).
David Blaikie357aafb2013-02-01 19:09:49 +0000236 EmitReturnBlock();
Daniel Dunbarfab3f932008-11-11 20:59:54 +0000237
Daniel Dunbar468a8f82011-02-10 17:32:22 +0000238 if (ShouldInstrumentFunction())
239 EmitFunctionInstrumentation("__cyg_profile_func_exit");
Chris Lattner3c77a352010-06-22 00:03:40 +0000240
Daniel Dunbarfab3f932008-11-11 20:59:54 +0000241 // Emit debug descriptor for function end.
Anders Carlsson63784f42009-02-13 08:11:52 +0000242 if (CGDebugInfo *DI = getDebugInfo()) {
Devang Patel0884a602010-07-22 22:29:16 +0000243 DI->EmitFunctionEnd(Builder);
Daniel Dunbarfab3f932008-11-11 20:59:54 +0000244 }
245
Nick Lewycky2d84e842013-10-02 02:29:49 +0000246 EmitFunctionEpilog(*CurFnInfo, EmitRetDbgLoc, EndLoc);
Mike Stump1d849212009-12-07 23:38:24 +0000247 EmitEndEHSpec(CurCodeDecl);
Daniel Dunbar54bb1932008-09-09 21:00:17 +0000248
John McCallbd309292010-07-06 01:34:17 +0000249 assert(EHStack.empty() &&
250 "did not remove all scopes from cleanup stack!");
251
Chris Lattner6c4d2552009-10-28 23:59:40 +0000252 // If someone did an indirect goto, emit the indirect goto block at the end of
253 // the function.
254 if (IndirectBranch) {
255 EmitBlock(IndirectBranch->getParent());
256 Builder.ClearInsertionPoint();
257 }
Michael Ilseman686240a2012-12-04 00:29:55 +0000258
Chris Lattnerc48023b2007-12-02 06:32:24 +0000259 // Remove the AllocaInsertPt instruction, which is just a convenience for us.
Chris Lattner2739d2b2009-03-31 22:17:44 +0000260 llvm::Instruction *Ptr = AllocaInsertPt;
Chris Lattnerc48023b2007-12-02 06:32:24 +0000261 AllocaInsertPt = 0;
Chris Lattner2739d2b2009-03-31 22:17:44 +0000262 Ptr->eraseFromParent();
Michael Ilseman686240a2012-12-04 00:29:55 +0000263
Chris Lattner6c4d2552009-10-28 23:59:40 +0000264 // If someone took the address of a label but never did an indirect goto, we
265 // made a zero entry PHI node, which is illegal, zap it now.
266 if (IndirectBranch) {
267 llvm::PHINode *PN = cast<llvm::PHINode>(IndirectBranch->getAddress());
268 if (PN->getNumIncomingValues() == 0) {
269 PN->replaceAllUsesWith(llvm::UndefValue::get(PN->getType()));
270 PN->eraseFromParent();
271 }
272 }
John McCallbd309292010-07-06 01:34:17 +0000273
John McCall8e4c74b2011-08-11 02:22:43 +0000274 EmitIfUsed(*this, EHResumeBlock);
John McCallbd309292010-07-06 01:34:17 +0000275 EmitIfUsed(*this, TerminateLandingPad);
276 EmitIfUsed(*this, TerminateHandler);
277 EmitIfUsed(*this, UnreachableBlock);
John McCall09ae0322010-07-06 23:57:41 +0000278
279 if (CGM.getCodeGenOpts().EmitDeclMetadata)
280 EmitDeclMetadata();
Chris Lattnerd1af2d22007-05-29 23:17:50 +0000281}
Chris Lattner308f4312007-05-29 23:50:05 +0000282
Chris Lattner3c77a352010-06-22 00:03:40 +0000283/// ShouldInstrumentFunction - Return true if the current function should be
284/// instrumented with __cyg_profile_func_* calls
285bool CodeGenFunction::ShouldInstrumentFunction() {
286 if (!CGM.getCodeGenOpts().InstrumentFunctions)
287 return false;
Ted Kremenekc249c412011-05-16 23:49:20 +0000288 if (!CurFuncDecl || CurFuncDecl->hasAttr<NoInstrumentFunctionAttr>())
Chris Lattner3c77a352010-06-22 00:03:40 +0000289 return false;
290 return true;
291}
292
293/// EmitFunctionInstrumentation - Emit LLVM code to call the specified
294/// instrumentation function with the current function and the call site, if
295/// function instrumentation is enabled.
296void CodeGenFunction::EmitFunctionInstrumentation(const char *Fn) {
Chris Lattnerb48a2d52010-06-23 05:21:28 +0000297 // void __cyg_profile_func_{enter,exit} (void *this_fn, void *call_site);
Chris Lattnera5f58b02011-07-09 17:41:47 +0000298 llvm::PointerType *PointerTy = Int8PtrTy;
299 llvm::Type *ProfileFuncArgs[] = { PointerTy, PointerTy };
Chris Lattner2192fe52011-07-18 04:24:23 +0000300 llvm::FunctionType *FunctionTy =
Chris Lattnerece04092012-02-07 00:39:47 +0000301 llvm::FunctionType::get(VoidTy, ProfileFuncArgs, false);
Chris Lattner3c77a352010-06-22 00:03:40 +0000302
303 llvm::Constant *F = CGM.CreateRuntimeFunction(FunctionTy, Fn);
304 llvm::CallInst *CallSite = Builder.CreateCall(
Benjamin Kramer8d375ce2011-07-14 17:45:50 +0000305 CGM.getIntrinsic(llvm::Intrinsic::returnaddress),
Chris Lattner5e016ae2010-06-27 07:15:29 +0000306 llvm::ConstantInt::get(Int32Ty, 0),
Chris Lattner3c77a352010-06-22 00:03:40 +0000307 "callsite");
308
John McCall882987f2013-02-28 19:01:20 +0000309 llvm::Value *args[] = {
310 llvm::ConstantExpr::getBitCast(CurFn, PointerTy),
311 CallSite
312 };
313
314 EmitNounwindRuntimeCall(F, args);
Chris Lattner3c77a352010-06-22 00:03:40 +0000315}
316
Roman Divacky178e01602011-02-10 16:52:03 +0000317void CodeGenFunction::EmitMCountInstrumentation() {
Chris Lattnerece04092012-02-07 00:39:47 +0000318 llvm::FunctionType *FTy = llvm::FunctionType::get(VoidTy, false);
Roman Divacky178e01602011-02-10 16:52:03 +0000319
John McCallc8e01702013-04-16 22:48:15 +0000320 llvm::Constant *MCountFn =
321 CGM.CreateRuntimeFunction(FTy, getTarget().getMCountName());
John McCall882987f2013-02-28 19:01:20 +0000322 EmitNounwindRuntimeCall(MCountFn);
Roman Divacky178e01602011-02-10 16:52:03 +0000323}
324
Tanya Lattner7445ada2012-07-11 23:02:10 +0000325// OpenCL v1.2 s5.6.4.6 allows the compiler to store kernel argument
326// information in the program executable. The argument information stored
327// includes the argument name, its type, the address and access qualifiers used.
Tanya Lattner7445ada2012-07-11 23:02:10 +0000328static void GenOpenCLArgMetadata(const FunctionDecl *FD, llvm::Function *Fn,
329 CodeGenModule &CGM,llvm::LLVMContext &Context,
Guy Benyeifb36ede2013-03-24 13:58:12 +0000330 SmallVector <llvm::Value*, 5> &kernelMDArgs,
331 CGBuilderTy& Builder, ASTContext &ASTCtx) {
332 // Create MDNodes that represent the kernel arg metadata.
Tanya Lattner7445ada2012-07-11 23:02:10 +0000333 // Each MDNode is a list in the form of "key", N number of values which is
334 // the same number of values as their are kernel arguments.
Michael Ilseman686240a2012-12-04 00:29:55 +0000335
Guy Benyeifb36ede2013-03-24 13:58:12 +0000336 // MDNode for the kernel argument address space qualifiers.
337 SmallVector<llvm::Value*, 8> addressQuals;
338 addressQuals.push_back(llvm::MDString::get(Context, "kernel_arg_addr_space"));
339
340 // MDNode for the kernel argument access qualifiers (images only).
341 SmallVector<llvm::Value*, 8> accessQuals;
342 accessQuals.push_back(llvm::MDString::get(Context, "kernel_arg_access_qual"));
343
344 // MDNode for the kernel argument type names.
345 SmallVector<llvm::Value*, 8> argTypeNames;
346 argTypeNames.push_back(llvm::MDString::get(Context, "kernel_arg_type"));
347
348 // MDNode for the kernel argument type qualifiers.
349 SmallVector<llvm::Value*, 8> argTypeQuals;
350 argTypeQuals.push_back(llvm::MDString::get(Context, "kernel_arg_type_qual"));
351
Tanya Lattner7445ada2012-07-11 23:02:10 +0000352 // MDNode for the kernel argument names.
353 SmallVector<llvm::Value*, 8> argNames;
354 argNames.push_back(llvm::MDString::get(Context, "kernel_arg_name"));
Michael Ilseman686240a2012-12-04 00:29:55 +0000355
Tanya Lattner7445ada2012-07-11 23:02:10 +0000356 for (unsigned i = 0, e = FD->getNumParams(); i != e; ++i) {
357 const ParmVarDecl *parm = FD->getParamDecl(i);
Guy Benyeifb36ede2013-03-24 13:58:12 +0000358 QualType ty = parm->getType();
359 std::string typeQuals;
360
361 if (ty->isPointerType()) {
362 QualType pointeeTy = ty->getPointeeType();
363
364 // Get address qualifier.
365 addressQuals.push_back(Builder.getInt32(ASTCtx.getTargetAddressSpace(
366 pointeeTy.getAddressSpace())));
367
368 // Get argument type name.
369 std::string typeName = pointeeTy.getUnqualifiedType().getAsString() + "*";
370
371 // Turn "unsigned type" to "utype"
372 std::string::size_type pos = typeName.find("unsigned");
Benjamin Krameref89ae02013-03-24 16:04:55 +0000373 if (pos != std::string::npos)
374 typeName.erase(pos+1, 8);
Guy Benyeifb36ede2013-03-24 13:58:12 +0000375
376 argTypeNames.push_back(llvm::MDString::get(Context, typeName));
377
378 // Get argument type qualifiers:
379 if (ty.isRestrictQualified())
380 typeQuals = "restrict";
381 if (pointeeTy.isConstQualified() ||
382 (pointeeTy.getAddressSpace() == LangAS::opencl_constant))
Benjamin Krameref89ae02013-03-24 16:04:55 +0000383 typeQuals += typeQuals.empty() ? "const" : " const";
Guy Benyeifb36ede2013-03-24 13:58:12 +0000384 if (pointeeTy.isVolatileQualified())
Benjamin Krameref89ae02013-03-24 16:04:55 +0000385 typeQuals += typeQuals.empty() ? "volatile" : " volatile";
Guy Benyeifb36ede2013-03-24 13:58:12 +0000386 } else {
387 addressQuals.push_back(Builder.getInt32(0));
388
389 // Get argument type name.
390 std::string typeName = ty.getUnqualifiedType().getAsString();
391
392 // Turn "unsigned type" to "utype"
393 std::string::size_type pos = typeName.find("unsigned");
Benjamin Krameref89ae02013-03-24 16:04:55 +0000394 if (pos != std::string::npos)
395 typeName.erase(pos+1, 8);
Guy Benyeifb36ede2013-03-24 13:58:12 +0000396
397 argTypeNames.push_back(llvm::MDString::get(Context, typeName));
398
399 // Get argument type qualifiers:
400 if (ty.isConstQualified())
401 typeQuals = "const";
402 if (ty.isVolatileQualified())
Benjamin Krameref89ae02013-03-24 16:04:55 +0000403 typeQuals += typeQuals.empty() ? "volatile" : " volatile";
Guy Benyeifb36ede2013-03-24 13:58:12 +0000404 }
Justin Bogner0f066062013-11-22 10:20:40 +0000405
Guy Benyeifb36ede2013-03-24 13:58:12 +0000406 argTypeQuals.push_back(llvm::MDString::get(Context, typeQuals));
407
408 // Get image access qualifier:
409 if (ty->isImageType()) {
Aaron Ballmanc4327992013-12-19 03:09:10 +0000410 const OpenCLImageAccessAttr *A = parm->getAttr<OpenCLImageAccessAttr>();
411 if (A && A->getAccess() == CLIA_write_only)
Guy Benyeifb36ede2013-03-24 13:58:12 +0000412 accessQuals.push_back(llvm::MDString::get(Context, "write_only"));
413 else
414 accessQuals.push_back(llvm::MDString::get(Context, "read_only"));
415 } else
416 accessQuals.push_back(llvm::MDString::get(Context, "none"));
Michael Ilseman686240a2012-12-04 00:29:55 +0000417
Tanya Lattner7445ada2012-07-11 23:02:10 +0000418 // Get argument name.
419 argNames.push_back(llvm::MDString::get(Context, parm->getName()));
Tanya Lattner7445ada2012-07-11 23:02:10 +0000420 }
Guy Benyeifb36ede2013-03-24 13:58:12 +0000421
422 kernelMDArgs.push_back(llvm::MDNode::get(Context, addressQuals));
423 kernelMDArgs.push_back(llvm::MDNode::get(Context, accessQuals));
424 kernelMDArgs.push_back(llvm::MDNode::get(Context, argTypeNames));
425 kernelMDArgs.push_back(llvm::MDNode::get(Context, argTypeQuals));
Tanya Lattner7445ada2012-07-11 23:02:10 +0000426 kernelMDArgs.push_back(llvm::MDNode::get(Context, argNames));
427}
428
Michael Ilseman686240a2012-12-04 00:29:55 +0000429void CodeGenFunction::EmitOpenCLKernelMetadata(const FunctionDecl *FD,
Tanya Lattnerbcffcdf2012-07-09 22:06:01 +0000430 llvm::Function *Fn)
431{
432 if (!FD->hasAttr<OpenCLKernelAttr>())
433 return;
434
435 llvm::LLVMContext &Context = getLLVMContext();
436
Dmitri Gribenkof8579502013-01-12 19:30:44 +0000437 SmallVector <llvm::Value*, 5> kernelMDArgs;
Tanya Lattnerbcffcdf2012-07-09 22:06:01 +0000438 kernelMDArgs.push_back(Fn);
439
Tanya Lattner7445ada2012-07-11 23:02:10 +0000440 if (CGM.getCodeGenOpts().EmitOpenCLArgMetadata)
Guy Benyeifb36ede2013-03-24 13:58:12 +0000441 GenOpenCLArgMetadata(FD, Fn, CGM, Context, kernelMDArgs,
442 Builder, getContext());
Michael Ilseman686240a2012-12-04 00:29:55 +0000443
Aaron Ballmanc4327992013-12-19 03:09:10 +0000444 if (const VecTypeHintAttr *A = FD->getAttr<VecTypeHintAttr>()) {
445 QualType hintQTy = A->getTypeHint();
Joey Goulyaba589c2013-03-08 09:42:32 +0000446 const ExtVectorType *hintEltQTy = hintQTy->getAs<ExtVectorType>();
447 bool isSignedInteger =
448 hintQTy->isSignedIntegerType() ||
449 (hintEltQTy && hintEltQTy->getElementType()->isSignedIntegerType());
450 llvm::Value *attrMDArgs[] = {
451 llvm::MDString::get(Context, "vec_type_hint"),
Aaron Ballmanc4327992013-12-19 03:09:10 +0000452 llvm::UndefValue::get(CGM.getTypes().ConvertType(A->getTypeHint())),
Joey Goulyaba589c2013-03-08 09:42:32 +0000453 llvm::ConstantInt::get(
454 llvm::IntegerType::get(Context, 32),
455 llvm::APInt(32, (uint64_t)(isSignedInteger ? 1 : 0)))
456 };
457 kernelMDArgs.push_back(llvm::MDNode::get(Context, attrMDArgs));
458 }
459
Aaron Ballmanc4327992013-12-19 03:09:10 +0000460 if (const WorkGroupSizeHintAttr *A = FD->getAttr<WorkGroupSizeHintAttr>()) {
Benjamin Kramerc1b78412012-11-15 16:40:35 +0000461 llvm::Value *attrMDArgs[] = {
462 llvm::MDString::get(Context, "work_group_size_hint"),
Aaron Ballmanc4327992013-12-19 03:09:10 +0000463 Builder.getInt32(A->getXDim()),
464 Builder.getInt32(A->getYDim()),
465 Builder.getInt32(A->getZDim())
Benjamin Kramerc1b78412012-11-15 16:40:35 +0000466 };
Tanya Lattnerbcffcdf2012-07-09 22:06:01 +0000467 kernelMDArgs.push_back(llvm::MDNode::get(Context, attrMDArgs));
468 }
469
Aaron Ballmanc4327992013-12-19 03:09:10 +0000470 if (const ReqdWorkGroupSizeAttr *A = FD->getAttr<ReqdWorkGroupSizeAttr>()) {
Benjamin Kramerc1b78412012-11-15 16:40:35 +0000471 llvm::Value *attrMDArgs[] = {
472 llvm::MDString::get(Context, "reqd_work_group_size"),
Aaron Ballmanc4327992013-12-19 03:09:10 +0000473 Builder.getInt32(A->getXDim()),
474 Builder.getInt32(A->getYDim()),
475 Builder.getInt32(A->getZDim())
Benjamin Kramerc1b78412012-11-15 16:40:35 +0000476 };
Tanya Lattnerbcffcdf2012-07-09 22:06:01 +0000477 kernelMDArgs.push_back(llvm::MDNode::get(Context, attrMDArgs));
478 }
479
480 llvm::MDNode *kernelMDNode = llvm::MDNode::get(Context, kernelMDArgs);
481 llvm::NamedMDNode *OpenCLKernelMetadata =
482 CGM.getModule().getOrInsertNamedMetadata("opencl.kernels");
483 OpenCLKernelMetadata->addOperand(kernelMDNode);
484}
485
John McCalldec348f72013-05-03 07:33:41 +0000486void CodeGenFunction::StartFunction(GlobalDecl GD,
487 QualType RetTy,
Daniel Dunbarbc915f42008-09-09 23:14:03 +0000488 llvm::Function *Fn,
John McCalla738c252011-03-09 04:27:21 +0000489 const CGFunctionInfo &FnInfo,
Daniel Dunbar354d2782008-10-18 18:22:23 +0000490 const FunctionArgList &Args,
Tilmann Scheller99cc30c2011-03-02 21:36:49 +0000491 SourceLocation StartLoc) {
Anders Carlsson73fcc952009-09-11 00:07:24 +0000492 const Decl *D = GD.getDecl();
Michael Ilseman686240a2012-12-04 00:29:55 +0000493
Anders Carlssonf4478e92009-02-09 20:20:56 +0000494 DidCallStackSave = false;
John McCalldec348f72013-05-03 07:33:41 +0000495 CurCodeDecl = D;
496 CurFuncDecl = (D ? D->getNonClosureContext() : 0);
Daniel Dunbarbc915f42008-09-09 23:14:03 +0000497 FnRetTy = RetTy;
Daniel Dunbar9c426522008-07-29 23:18:29 +0000498 CurFn = Fn;
John McCalla738c252011-03-09 04:27:21 +0000499 CurFnInfo = &FnInfo;
Chris Lattner5696e7b2008-06-17 18:05:57 +0000500 assert(CurFn->isDeclaration() && "Function already has body?");
501
Will Dietzf54319c2013-01-18 11:30:38 +0000502 if (CGM.getSanitizerBlacklist().isIn(*Fn)) {
503 SanOpts = &SanitizerOptions::Disabled;
504 SanitizePerformTypeCheck = false;
505 }
506
Jakob Stoklund Olesen819e54b2010-02-09 00:10:00 +0000507 // Pass inline keyword to optimizer if it appears explicitly on any
508 // declaration.
Michael Ilseman686240a2012-12-04 00:29:55 +0000509 if (!CGM.getCodeGenOpts().NoInline)
Chad Rosier883b2572012-03-14 23:32:11 +0000510 if (const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(D))
511 for (FunctionDecl::redecl_iterator RI = FD->redecls_begin(),
512 RE = FD->redecls_end(); RI != RE; ++RI)
513 if (RI->isInlineSpecified()) {
Bill Wendling207f0532012-12-20 19:27:06 +0000514 Fn->addFnAttr(llvm::Attribute::InlineHint);
Chad Rosier883b2572012-03-14 23:32:11 +0000515 break;
516 }
Jakob Stoklund Olesen819e54b2010-02-09 00:10:00 +0000517
Richard Smith9c6890a2012-11-01 22:30:59 +0000518 if (getLangOpts().OpenCL) {
Peter Collingbourne7ce13fc2011-02-14 01:42:53 +0000519 // Add metadata for a kernel function.
520 if (const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(D))
Tanya Lattnerbcffcdf2012-07-09 22:06:01 +0000521 EmitOpenCLKernelMetadata(FD, Fn);
Peter Collingbourne7ce13fc2011-02-14 01:42:53 +0000522 }
523
Peter Collingbourneb453cd62013-10-20 21:29:19 +0000524 // If we are checking function types, emit a function type signature as
525 // prefix data.
526 if (getLangOpts().CPlusPlus && SanOpts->Function) {
527 if (const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(D)) {
528 if (llvm::Constant *PrefixSig =
529 CGM.getTargetCodeGenInfo().getUBSanFunctionSignature(CGM)) {
530 llvm::Constant *FTRTTIConst =
531 CGM.GetAddrOfRTTIDescriptor(FD->getType(), /*ForEH=*/true);
532 llvm::Constant *PrefixStructElems[] = { PrefixSig, FTRTTIConst };
533 llvm::Constant *PrefixStructConst =
534 llvm::ConstantStruct::getAnon(PrefixStructElems, /*Packed=*/true);
535 Fn->setPrefixData(PrefixStructConst);
536 }
537 }
538 }
539
Daniel Dunbar75283ff2008-11-11 02:29:29 +0000540 llvm::BasicBlock *EntryBB = createBasicBlock("entry", CurFn);
Daniel Dunbar54bb1932008-09-09 21:00:17 +0000541
Chris Lattner5696e7b2008-06-17 18:05:57 +0000542 // Create a marker to make it easy to insert allocas into the entryblock
543 // later. Don't create this with the builder, because we don't want it
544 // folded.
Chris Lattner5e016ae2010-06-27 07:15:29 +0000545 llvm::Value *Undef = llvm::UndefValue::get(Int32Ty);
546 AllocaInsertPt = new llvm::BitCastInst(Undef, Int32Ty, "", EntryBB);
Chris Lattner47640222009-03-22 00:24:14 +0000547 if (Builder.isNamePreserving())
548 AllocaInsertPt->setName("allocapt");
Mike Stump11289f42009-09-09 15:08:12 +0000549
John McCallbd309292010-07-06 01:34:17 +0000550 ReturnBlock = getJumpDestInCurrentScope("return");
Mike Stump11289f42009-09-09 15:08:12 +0000551
Chris Lattner5696e7b2008-06-17 18:05:57 +0000552 Builder.SetInsertPoint(EntryBB);
Mike Stump11289f42009-09-09 15:08:12 +0000553
Sanjiv Gupta1e8b6082008-07-04 11:04:26 +0000554 // Emit subprogram debug descriptor.
Anders Carlsson63784f42009-02-13 08:11:52 +0000555 if (CGDebugInfo *DI = getDebugInfo()) {
Jordan Rose5c382722013-03-08 21:51:21 +0000556 SmallVector<QualType, 16> ArgTypes;
Eric Christopher4b4beb22011-10-21 23:30:10 +0000557 for (FunctionArgList::const_iterator i = Args.begin(), e = Args.end();
558 i != e; ++i) {
Jordan Rose5c382722013-03-08 21:51:21 +0000559 ArgTypes.push_back((*i)->getType());
Eric Christopher4b4beb22011-10-21 23:30:10 +0000560 }
561
John McCalldb40c7f2010-12-14 08:05:40 +0000562 QualType FnType =
Jordan Rose5c382722013-03-08 21:51:21 +0000563 getContext().getFunctionType(RetTy, ArgTypes,
John McCalldb40c7f2010-12-14 08:05:40 +0000564 FunctionProtoType::ExtProtoInfo());
565
Daniel Dunbar354d2782008-10-18 18:22:23 +0000566 DI->setLocation(StartLoc);
Devang Patel934661e2010-01-14 00:36:21 +0000567 DI->EmitFunctionStart(GD, FnType, CurFn, Builder);
Sanjiv Gupta1e8b6082008-07-04 11:04:26 +0000568 }
569
Daniel Dunbar468a8f82011-02-10 17:32:22 +0000570 if (ShouldInstrumentFunction())
571 EmitFunctionInstrumentation("__cyg_profile_func_enter");
Chris Lattner3c77a352010-06-22 00:03:40 +0000572
Roman Divacky178e01602011-02-10 16:52:03 +0000573 if (CGM.getCodeGenOpts().InstrumentForProfiling)
574 EmitMCountInstrumentation();
575
Justin Bogneref512b92014-01-06 22:27:43 +0000576 PGO.assignRegionCounters(GD);
577
Eli Friedman4b1942c2009-12-04 02:43:40 +0000578 if (RetTy->isVoidType()) {
579 // Void type; nothing to return.
580 ReturnValue = 0;
581 } else if (CurFnInfo->getReturnInfo().getKind() == ABIArgInfo::Indirect &&
John McCall47fb9502013-03-07 21:37:08 +0000582 !hasScalarEvaluationKind(CurFnInfo->getReturnType())) {
Eli Friedman4b1942c2009-12-04 02:43:40 +0000583 // Indirect aggregate return; emit returned value directly into sret slot.
Daniel Dunbarfd09df72010-02-16 19:45:20 +0000584 // This reduces code size, and affects correctness in C++.
Eli Friedman4b1942c2009-12-04 02:43:40 +0000585 ReturnValue = CurFn->arg_begin();
586 } else {
Daniel Dunbarfd09df72010-02-16 19:45:20 +0000587 ReturnValue = CreateIRTemp(RetTy, "retval");
John McCall31168b02011-06-15 23:02:42 +0000588
589 // Tell the epilog emitter to autorelease the result. We do this
590 // now so that various specialized functions can suppress it
591 // during their IR-generation.
David Blaikiebbafb8a2012-03-11 07:00:24 +0000592 if (getLangOpts().ObjCAutoRefCount &&
John McCall31168b02011-06-15 23:02:42 +0000593 !CurFnInfo->isReturnsRetained() &&
594 RetTy->isObjCRetainableType())
595 AutoreleaseResult = true;
Eli Friedman4b1942c2009-12-04 02:43:40 +0000596 }
597
Mike Stump1d849212009-12-07 23:38:24 +0000598 EmitStartEHSpec(CurCodeDecl);
John McCall31168b02011-06-15 23:02:42 +0000599
600 PrologueCleanupDepth = EHStack.stable_begin();
Daniel Dunbard931a872009-02-02 22:03:45 +0000601 EmitFunctionProlog(*CurFnInfo, CurFn, Args);
Mike Stump11289f42009-09-09 15:08:12 +0000602
Eli Friedman9fbeba02012-02-11 02:57:39 +0000603 if (D && isa<CXXMethodDecl>(D) && cast<CXXMethodDecl>(D)->isInstance()) {
John McCall5d865c322010-08-31 07:33:07 +0000604 CGM.getCXXABI().EmitInstanceFunctionProlog(*this);
Eli Friedman9fbeba02012-02-11 02:57:39 +0000605 const CXXMethodDecl *MD = cast<CXXMethodDecl>(D);
606 if (MD->getParent()->isLambda() &&
607 MD->getOverloadedOperator() == OO_Call) {
608 // We're in a lambda; figure out the captures.
609 MD->getParent()->getCaptureFields(LambdaCaptureFields,
610 LambdaThisCaptureField);
611 if (LambdaThisCaptureField) {
612 // If this lambda captures this, load it.
John McCalldec348f72013-05-03 07:33:41 +0000613 LValue ThisLValue = EmitLValueForLambdaField(LambdaThisCaptureField);
Nick Lewycky2d84e842013-10-02 02:29:49 +0000614 CXXThisValue = EmitLoadOfLValue(ThisLValue,
615 SourceLocation()).getScalarVal();
Eli Friedman9fbeba02012-02-11 02:57:39 +0000616 }
617 } else {
618 // Not in a lambda; just use 'this' from the method.
619 // FIXME: Should we generate a new load for each use of 'this'? The
620 // fast register allocator would be happier...
621 CXXThisValue = CXXABIThisValue;
622 }
623 }
John McCall347132b2010-02-16 22:04:33 +0000624
Anders Carlssonc20879a2008-12-20 21:28:43 +0000625 // If any of the arguments have a variably modified type, make sure to
626 // emit the type size.
627 for (FunctionArgList::const_iterator i = Args.begin(), e = Args.end();
628 i != e; ++i) {
Eli Friedman1f576832012-11-14 22:09:59 +0000629 const VarDecl *VD = *i;
630
631 // Dig out the type as written from ParmVarDecls; it's unclear whether
632 // the standard (C99 6.9.1p10) requires this, but we're following the
633 // precedent set by gcc.
634 QualType Ty;
635 if (const ParmVarDecl *PVD = dyn_cast<ParmVarDecl>(VD))
636 Ty = PVD->getOriginalType();
637 else
638 Ty = VD->getType();
Anders Carlssonc20879a2008-12-20 21:28:43 +0000639
640 if (Ty->isVariablyModifiedType())
John McCall23c29fe2011-06-24 21:55:10 +0000641 EmitVariablyModifiedType(Ty);
Anders Carlssonc20879a2008-12-20 21:28:43 +0000642 }
Eric Christopher7cdf9482011-10-13 21:45:18 +0000643 // Emit a location at the end of the prologue.
644 if (CGDebugInfo *DI = getDebugInfo())
645 DI->EmitLocation(Builder, StartLoc);
Daniel Dunbarbc915f42008-09-09 23:14:03 +0000646}
Eli Friedman3d421e12008-08-25 21:31:01 +0000647
Richard Smithb47c36f2013-11-05 09:12:18 +0000648void CodeGenFunction::EmitFunctionBody(FunctionArgList &Args,
649 const Stmt *Body) {
Justin Bogneref512b92014-01-06 22:27:43 +0000650 RegionCounter Cnt = getPGORegionCounter(Body);
651 Cnt.beginRegion(Builder);
Richard Smithb47c36f2013-11-05 09:12:18 +0000652 if (const CompoundStmt *S = dyn_cast<CompoundStmt>(Body))
David Blaikie0a21d0d2013-01-26 22:16:26 +0000653 EmitCompoundStmtWithoutScope(*S);
654 else
Richard Smithb47c36f2013-11-05 09:12:18 +0000655 EmitStmt(Body);
John McCall89b12b32010-02-18 03:17:58 +0000656}
657
John McCall8601a752010-08-03 22:46:07 +0000658/// Tries to mark the given function nounwind based on the
659/// non-existence of any throwing calls within it. We believe this is
660/// lightweight enough to do at -O0.
661static void TryMarkNoThrow(llvm::Function *F) {
John McCall59966992010-08-11 22:38:33 +0000662 // LLVM treats 'nounwind' on a function as part of the type, so we
663 // can't do this on functions that can be overwritten.
664 if (F->mayBeOverridden()) return;
665
John McCall8601a752010-08-03 22:46:07 +0000666 for (llvm::Function::iterator FI = F->begin(), FE = F->end(); FI != FE; ++FI)
667 for (llvm::BasicBlock::iterator
668 BI = FI->begin(), BE = FI->end(); BI != BE; ++BI)
Bill Wendlingf0724e82011-09-19 20:31:14 +0000669 if (llvm::CallInst *Call = dyn_cast<llvm::CallInst>(&*BI)) {
John McCall8601a752010-08-03 22:46:07 +0000670 if (!Call->doesNotThrow())
671 return;
Bill Wendlingf0724e82011-09-19 20:31:14 +0000672 } else if (isa<llvm::ResumeInst>(&*BI)) {
673 return;
674 }
Bill Wendling73e465e2012-10-10 03:13:20 +0000675 F->setDoesNotThrow();
John McCall8601a752010-08-03 22:46:07 +0000676}
677
Richard Smithb47c36f2013-11-05 09:12:18 +0000678static void EmitSizedDeallocationFunction(CodeGenFunction &CGF,
679 const FunctionDecl *UnsizedDealloc) {
680 // This is a weak discardable definition of the sized deallocation function.
681 CGF.CurFn->setLinkage(llvm::Function::LinkOnceAnyLinkage);
682
683 // Call the unsized deallocation function and forward the first argument
684 // unchanged.
685 llvm::Constant *Unsized = CGF.CGM.GetAddrOfFunction(UnsizedDealloc);
686 CGF.Builder.CreateCall(Unsized, &*CGF.CurFn->arg_begin());
687}
688
John McCalla738c252011-03-09 04:27:21 +0000689void CodeGenFunction::GenerateCode(GlobalDecl GD, llvm::Function *Fn,
690 const CGFunctionInfo &FnInfo) {
Anders Carlsson73fcc952009-09-11 00:07:24 +0000691 const FunctionDecl *FD = cast<FunctionDecl>(GD.getDecl());
Michael Ilseman686240a2012-12-04 00:29:55 +0000692
Anders Carlsson63784f42009-02-13 08:11:52 +0000693 // Check if we should generate debug info for this function.
David Blaikie92848de2013-08-26 20:33:21 +0000694 if (FD->hasAttr<NoDebugAttr>())
695 DebugInfo = NULL; // disable debug info indefinitely for this function
Mike Stump11289f42009-09-09 15:08:12 +0000696
Daniel Dunbarbc915f42008-09-09 23:14:03 +0000697 FunctionArgList Args;
John McCall5d865c322010-08-31 07:33:07 +0000698 QualType ResTy = FD->getResultType();
Mike Stump11289f42009-09-09 15:08:12 +0000699
Mike Stumpbee78dd2009-12-04 23:26:17 +0000700 CurGD = GD;
Reid Kleckner89077a12013-12-17 19:46:40 +0000701 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD);
702 if (MD && MD->isInstance()) {
Stephen Lin9dc6eef2013-06-30 20:40:16 +0000703 if (CGM.getCXXABI().HasThisReturn(GD))
704 ResTy = MD->getThisType(getContext());
Reid Kleckner89077a12013-12-17 19:46:40 +0000705 CGM.getCXXABI().buildThisParam(*this, Args);
Stephen Lin9dc6eef2013-06-30 20:40:16 +0000706 }
Mike Stump11289f42009-09-09 15:08:12 +0000707
Chad Rosierf0cccf52012-02-18 00:37:07 +0000708 for (unsigned i = 0, e = FD->getNumParams(); i != e; ++i)
709 Args.push_back(FD->getParamDecl(i));
Daniel Dunbar89654ee2008-08-26 08:29:31 +0000710
Reid Kleckner89077a12013-12-17 19:46:40 +0000711 if (MD && (isa<CXXConstructorDecl>(MD) || isa<CXXDestructorDecl>(MD)))
712 CGM.getCXXABI().addImplicitStructorParams(*this, ResTy, Args);
713
John McCall89b12b32010-02-18 03:17:58 +0000714 SourceRange BodyRange;
715 if (Stmt *Body = FD->getBody()) BodyRange = Body->getSourceRange();
Adrian Prantldc237b52013-05-16 00:41:26 +0000716 CurEHLocation = BodyRange.getEnd();
Anders Carlsson438cf922009-11-06 02:55:43 +0000717
John McCall89b12b32010-02-18 03:17:58 +0000718 // Emit the standard function prologue.
John McCalla738c252011-03-09 04:27:21 +0000719 StartFunction(GD, ResTy, Fn, FnInfo, Args, BodyRange.getBegin());
Anders Carlsson438cf922009-11-06 02:55:43 +0000720
John McCall89b12b32010-02-18 03:17:58 +0000721 // Generate the body of the function.
John McCallb81884d2010-02-19 09:25:03 +0000722 if (isa<CXXDestructorDecl>(FD))
723 EmitDestructorBody(Args);
724 else if (isa<CXXConstructorDecl>(FD))
725 EmitConstructorBody(Args);
Richard Smith9c6890a2012-11-01 22:30:59 +0000726 else if (getLangOpts().CUDA &&
Peter Collingbournefa4d6032011-10-06 18:51:56 +0000727 !CGM.getCodeGenOpts().CUDAIsDevice &&
728 FD->hasAttr<CUDAGlobalAttr>())
729 CGM.getCUDARuntime().EmitDeviceStubBody(*this, Args);
Eli Friedman5a6d5072012-02-16 01:37:33 +0000730 else if (isa<CXXConversionDecl>(FD) &&
Douglas Gregor355efbb2012-02-17 03:02:34 +0000731 cast<CXXConversionDecl>(FD)->isLambdaToBlockPointerConversion()) {
732 // The lambda conversion to block pointer is special; the semantics can't be
733 // expressed in the AST, so IRGen needs to special-case it.
734 EmitLambdaToBlockPointerBody(Args);
735 } else if (isa<CXXMethodDecl>(FD) &&
736 cast<CXXMethodDecl>(FD)->isLambdaStaticInvoker()) {
Faisal Vali2b391ab2013-09-26 19:54:12 +0000737 // The lambda static invoker function is special, because it forwards or
Douglas Gregor355efbb2012-02-17 03:02:34 +0000738 // clones the body of the function call operator (but is actually static).
739 EmitLambdaStaticInvokeFunction(cast<CXXMethodDecl>(FD));
Lang Hamesbf122742013-02-17 07:22:09 +0000740 } else if (FD->isDefaulted() && isa<CXXMethodDecl>(FD) &&
Nick Lewyckyb39be1f2013-09-10 05:14:39 +0000741 (cast<CXXMethodDecl>(FD)->isCopyAssignmentOperator() ||
742 cast<CXXMethodDecl>(FD)->isMoveAssignmentOperator())) {
Lang Hamesbf122742013-02-17 07:22:09 +0000743 // Implicit copy-assignment gets the same special treatment as implicit
744 // copy-constructors.
745 emitImplicitAssignmentOperatorBody(Args);
Richard Smithb47c36f2013-11-05 09:12:18 +0000746 } else if (Stmt *Body = FD->getBody()) {
747 EmitFunctionBody(Args, Body);
748 } else if (FunctionDecl *UnsizedDealloc =
749 FD->getCorrespondingUnsizedGlobalDeallocationFunction()) {
750 // Global sized deallocation functions get an implicit weak definition if
751 // they don't have an explicit definition.
752 EmitSizedDeallocationFunction(*this, UnsizedDealloc);
753 } else
754 llvm_unreachable("no definition for emitted function");
Anders Carlssonff8cce42010-02-07 19:45:40 +0000755
Richard Smith9f9e5822012-10-04 23:52:29 +0000756 // C++11 [stmt.return]p2:
757 // Flowing off the end of a function [...] results in undefined behavior in
758 // a value-returning function.
759 // C11 6.9.1p12:
760 // If the '}' that terminates a function is reached, and the value of the
761 // function call is used by the caller, the behavior is undefined.
Richard Smith9c6890a2012-11-01 22:30:59 +0000762 if (getLangOpts().CPlusPlus && !FD->hasImplicitReturnZero() &&
Richard Smith9f9e5822012-10-04 23:52:29 +0000763 !FD->getResultType()->isVoidType() && Builder.GetInsertBlock()) {
Will Dietzf54319c2013-01-18 11:30:38 +0000764 if (SanOpts->Return)
Richard Smithe30752c2012-10-09 19:52:38 +0000765 EmitCheck(Builder.getFalse(), "missing_return",
766 EmitCheckSourceLocation(FD->getLocation()),
Dmitri Gribenkof8579502013-01-12 19:30:44 +0000767 ArrayRef<llvm::Value *>(), CRK_Unrecoverable);
Richard Smith6b4ebcc2012-10-15 00:23:07 +0000768 else if (CGM.getCodeGenOpts().OptimizationLevel == 0)
769 Builder.CreateCall(CGM.getIntrinsic(llvm::Intrinsic::trap));
Richard Smith9f9e5822012-10-04 23:52:29 +0000770 Builder.CreateUnreachable();
771 Builder.ClearInsertionPoint();
772 }
773
John McCall89b12b32010-02-18 03:17:58 +0000774 // Emit the standard function epilogue.
775 FinishFunction(BodyRange.getEnd());
John McCall8601a752010-08-03 22:46:07 +0000776
777 // If we haven't marked the function nothrow through other means, do
778 // a quick pass now to see if we can.
779 if (!CurFn->doesNotThrow())
780 TryMarkNoThrow(CurFn);
Justin Bogneref512b92014-01-06 22:27:43 +0000781
782 PGO.emitWriteoutFunction(CurGD);
783 PGO.destroyRegionCounters();
Chris Lattner5696e7b2008-06-17 18:05:57 +0000784}
785
Chris Lattner5b1964b2008-11-11 07:41:27 +0000786/// ContainsLabel - Return true if the statement contains a label in it. If
787/// this statement is not executed normally, it not containing a label means
788/// that we can just remove the code.
789bool CodeGenFunction::ContainsLabel(const Stmt *S, bool IgnoreCaseStmts) {
790 // Null statement, not a label!
791 if (S == 0) return false;
Mike Stump11289f42009-09-09 15:08:12 +0000792
Chris Lattner5b1964b2008-11-11 07:41:27 +0000793 // If this is a label, we have to emit the code, consider something like:
794 // if (0) { ... foo: bar(); } goto foo;
Chris Lattner29911cc2011-02-28 00:18:40 +0000795 //
796 // TODO: If anyone cared, we could track __label__'s, since we know that you
797 // can't jump to one from outside their declared region.
Chris Lattner5b1964b2008-11-11 07:41:27 +0000798 if (isa<LabelStmt>(S))
799 return true;
Michael Ilseman686240a2012-12-04 00:29:55 +0000800
Chris Lattner5b1964b2008-11-11 07:41:27 +0000801 // If this is a case/default statement, and we haven't seen a switch, we have
802 // to emit the code.
803 if (isa<SwitchCase>(S) && !IgnoreCaseStmts)
804 return true;
Mike Stump11289f42009-09-09 15:08:12 +0000805
Chris Lattner5b1964b2008-11-11 07:41:27 +0000806 // If this is a switch statement, we want to ignore cases below it.
807 if (isa<SwitchStmt>(S))
808 IgnoreCaseStmts = true;
Mike Stump11289f42009-09-09 15:08:12 +0000809
Chris Lattner5b1964b2008-11-11 07:41:27 +0000810 // Scan subexpressions for verboten labels.
John McCall8322c3a2011-02-13 04:07:26 +0000811 for (Stmt::const_child_range I = S->children(); I; ++I)
Chris Lattner5b1964b2008-11-11 07:41:27 +0000812 if (ContainsLabel(*I, IgnoreCaseStmts))
813 return true;
Mike Stump11289f42009-09-09 15:08:12 +0000814
Chris Lattner5b1964b2008-11-11 07:41:27 +0000815 return false;
816}
817
Chris Lattner29911cc2011-02-28 00:18:40 +0000818/// containsBreak - Return true if the statement contains a break out of it.
819/// If the statement (recursively) contains a switch or loop with a break
820/// inside of it, this is fine.
821bool CodeGenFunction::containsBreak(const Stmt *S) {
822 // Null statement, not a label!
823 if (S == 0) return false;
824
825 // If this is a switch or loop that defines its own break scope, then we can
826 // include it and anything inside of it.
827 if (isa<SwitchStmt>(S) || isa<WhileStmt>(S) || isa<DoStmt>(S) ||
828 isa<ForStmt>(S))
Chris Lattner30db8282011-02-28 00:42:31 +0000829 return false;
Michael Ilseman686240a2012-12-04 00:29:55 +0000830
Chris Lattner30db8282011-02-28 00:42:31 +0000831 if (isa<BreakStmt>(S))
Chris Lattner29911cc2011-02-28 00:18:40 +0000832 return true;
Michael Ilseman686240a2012-12-04 00:29:55 +0000833
Chris Lattner29911cc2011-02-28 00:18:40 +0000834 // Scan subexpressions for verboten breaks.
835 for (Stmt::const_child_range I = S->children(); I; ++I)
836 if (containsBreak(*I))
837 return true;
Michael Ilseman686240a2012-12-04 00:29:55 +0000838
Chris Lattner29911cc2011-02-28 00:18:40 +0000839 return false;
840}
841
Chris Lattnercd439292008-11-12 08:04:58 +0000842
Chris Lattner41c6ab52011-02-27 23:02:32 +0000843/// ConstantFoldsToSimpleInteger - If the specified expression does not fold
844/// to a constant, or if it does but contains a label, return false. If it
845/// constant folds return true and set the boolean result in Result.
846bool CodeGenFunction::ConstantFoldsToSimpleInteger(const Expr *Cond,
847 bool &ResultBool) {
Richard Trieuc320c742012-07-23 20:21:35 +0000848 llvm::APSInt ResultInt;
Chris Lattner29911cc2011-02-28 00:18:40 +0000849 if (!ConstantFoldsToSimpleInteger(Cond, ResultInt))
850 return false;
Michael Ilseman686240a2012-12-04 00:29:55 +0000851
Chris Lattner29911cc2011-02-28 00:18:40 +0000852 ResultBool = ResultInt.getBoolValue();
853 return true;
854}
855
856/// ConstantFoldsToSimpleInteger - If the specified expression does not fold
857/// to a constant, or if it does but contains a label, return false. If it
858/// constant folds return true and set the folded value.
859bool CodeGenFunction::
Richard Trieuc320c742012-07-23 20:21:35 +0000860ConstantFoldsToSimpleInteger(const Expr *Cond, llvm::APSInt &ResultInt) {
Daniel Dunbarf32443c2008-11-12 22:37:10 +0000861 // FIXME: Rename and handle conversion of other evaluatable things
862 // to bool.
Richard Smith5fab0c92011-12-28 19:48:30 +0000863 llvm::APSInt Int;
864 if (!Cond->EvaluateAsInt(Int, getContext()))
Chris Lattner41c6ab52011-02-27 23:02:32 +0000865 return false; // Not foldable, not integer or not fully evaluatable.
Richard Smith5fab0c92011-12-28 19:48:30 +0000866
Chris Lattnercd439292008-11-12 08:04:58 +0000867 if (CodeGenFunction::ContainsLabel(Cond))
Chris Lattner41c6ab52011-02-27 23:02:32 +0000868 return false; // Contains a label.
Richard Smith5fab0c92011-12-28 19:48:30 +0000869
870 ResultInt = Int;
Chris Lattner41c6ab52011-02-27 23:02:32 +0000871 return true;
Chris Lattnercd439292008-11-12 08:04:58 +0000872}
873
874
Chris Lattner29911cc2011-02-28 00:18:40 +0000875
Chris Lattnercd439292008-11-12 08:04:58 +0000876/// EmitBranchOnBoolExpr - Emit a branch on a boolean condition (e.g. for an if
877/// statement) to the specified blocks. Based on the condition, this might try
878/// to simplify the codegen of the conditional based on the branch.
879///
880void CodeGenFunction::EmitBranchOnBoolExpr(const Expr *Cond,
881 llvm::BasicBlock *TrueBlock,
Justin Bogneref512b92014-01-06 22:27:43 +0000882 llvm::BasicBlock *FalseBlock,
883 uint64_t TrueCount) {
Peter Collingbourne91147592011-04-15 00:35:48 +0000884 Cond = Cond->IgnoreParens();
Mike Stump11289f42009-09-09 15:08:12 +0000885
Chris Lattnercd439292008-11-12 08:04:58 +0000886 if (const BinaryOperator *CondBOp = dyn_cast<BinaryOperator>(Cond)) {
Justin Bogneref512b92014-01-06 22:27:43 +0000887 RegionCounter Cnt = getPGORegionCounter(CondBOp);
888
Chris Lattnercd439292008-11-12 08:04:58 +0000889 // Handle X && Y in a condition.
John McCalle3027922010-08-25 11:45:40 +0000890 if (CondBOp->getOpcode() == BO_LAnd) {
Chris Lattnercd439292008-11-12 08:04:58 +0000891 // If we have "1 && X", simplify the code. "0 && X" would have constant
892 // folded if the case was simple enough.
Bill Wendling6c9540e2011-03-04 21:46:03 +0000893 bool ConstantBool = false;
Chris Lattner41c6ab52011-02-27 23:02:32 +0000894 if (ConstantFoldsToSimpleInteger(CondBOp->getLHS(), ConstantBool) &&
895 ConstantBool) {
Chris Lattnercd439292008-11-12 08:04:58 +0000896 // br(1 && X) -> br(X).
Justin Bogneref512b92014-01-06 22:27:43 +0000897 Cnt.beginRegion(Builder);
898 return EmitBranchOnBoolExpr(CondBOp->getRHS(), TrueBlock, FalseBlock,
899 TrueCount);
Chris Lattnercd439292008-11-12 08:04:58 +0000900 }
Mike Stump11289f42009-09-09 15:08:12 +0000901
Chris Lattnercd439292008-11-12 08:04:58 +0000902 // If we have "X && 1", simplify the code to use an uncond branch.
903 // "X && 0" would have been constant folded to 0.
Chris Lattner41c6ab52011-02-27 23:02:32 +0000904 if (ConstantFoldsToSimpleInteger(CondBOp->getRHS(), ConstantBool) &&
905 ConstantBool) {
Chris Lattnercd439292008-11-12 08:04:58 +0000906 // br(X && 1) -> br(X).
Justin Bogneref512b92014-01-06 22:27:43 +0000907 return EmitBranchOnBoolExpr(CondBOp->getLHS(), TrueBlock, FalseBlock,
908 TrueCount);
Chris Lattnercd439292008-11-12 08:04:58 +0000909 }
Mike Stump11289f42009-09-09 15:08:12 +0000910
Chris Lattnercd439292008-11-12 08:04:58 +0000911 // Emit the LHS as a conditional. If the LHS conditional is false, we
912 // want to jump to the FalseBlock.
Daniel Dunbara612e792008-11-13 01:38:36 +0000913 llvm::BasicBlock *LHSTrue = createBasicBlock("land.lhs.true");
Justin Bogneref512b92014-01-06 22:27:43 +0000914 // The counter tells us how often we evaluate RHS, and all of TrueCount
915 // can be propagated to that branch.
916 uint64_t RHSCount = Cnt.getCount();
John McCallce1de612011-01-26 04:00:11 +0000917
918 ConditionalEvaluation eval(*this);
Justin Bogneref512b92014-01-06 22:27:43 +0000919 EmitBranchOnBoolExpr(CondBOp->getLHS(), LHSTrue, FalseBlock, RHSCount);
Chris Lattnercd439292008-11-12 08:04:58 +0000920 EmitBlock(LHSTrue);
Mike Stump11289f42009-09-09 15:08:12 +0000921
Anders Carlsson60ddba62010-01-24 00:20:05 +0000922 // Any temporaries created here are conditional.
Justin Bogneref512b92014-01-06 22:27:43 +0000923 Cnt.beginRegion(Builder);
John McCallce1de612011-01-26 04:00:11 +0000924 eval.begin(*this);
Justin Bogneref512b92014-01-06 22:27:43 +0000925 EmitBranchOnBoolExpr(CondBOp->getRHS(), TrueBlock, FalseBlock, TrueCount);
John McCallce1de612011-01-26 04:00:11 +0000926 eval.end(*this);
Justin Bogneref512b92014-01-06 22:27:43 +0000927 Cnt.adjustFallThroughCount();
928 Cnt.applyAdjustmentsToRegion();
Anders Carlsson60ddba62010-01-24 00:20:05 +0000929
Chris Lattnercd439292008-11-12 08:04:58 +0000930 return;
Chris Lattner41c6ab52011-02-27 23:02:32 +0000931 }
Michael Ilseman686240a2012-12-04 00:29:55 +0000932
Chris Lattner41c6ab52011-02-27 23:02:32 +0000933 if (CondBOp->getOpcode() == BO_LOr) {
Chris Lattnercd439292008-11-12 08:04:58 +0000934 // If we have "0 || X", simplify the code. "1 || X" would have constant
935 // folded if the case was simple enough.
Bill Wendling6c9540e2011-03-04 21:46:03 +0000936 bool ConstantBool = false;
Chris Lattner41c6ab52011-02-27 23:02:32 +0000937 if (ConstantFoldsToSimpleInteger(CondBOp->getLHS(), ConstantBool) &&
938 !ConstantBool) {
Chris Lattnercd439292008-11-12 08:04:58 +0000939 // br(0 || X) -> br(X).
Justin Bogneref512b92014-01-06 22:27:43 +0000940 Cnt.beginRegion(Builder);
941 return EmitBranchOnBoolExpr(CondBOp->getRHS(), TrueBlock, FalseBlock,
942 TrueCount);
Chris Lattnercd439292008-11-12 08:04:58 +0000943 }
Mike Stump11289f42009-09-09 15:08:12 +0000944
Chris Lattnercd439292008-11-12 08:04:58 +0000945 // If we have "X || 0", simplify the code to use an uncond branch.
946 // "X || 1" would have been constant folded to 1.
Chris Lattner41c6ab52011-02-27 23:02:32 +0000947 if (ConstantFoldsToSimpleInteger(CondBOp->getRHS(), ConstantBool) &&
948 !ConstantBool) {
Chris Lattnercd439292008-11-12 08:04:58 +0000949 // br(X || 0) -> br(X).
Justin Bogneref512b92014-01-06 22:27:43 +0000950 return EmitBranchOnBoolExpr(CondBOp->getLHS(), TrueBlock, FalseBlock,
951 TrueCount);
Chris Lattnercd439292008-11-12 08:04:58 +0000952 }
Mike Stump11289f42009-09-09 15:08:12 +0000953
Chris Lattnercd439292008-11-12 08:04:58 +0000954 // Emit the LHS as a conditional. If the LHS conditional is true, we
955 // want to jump to the TrueBlock.
Daniel Dunbara612e792008-11-13 01:38:36 +0000956 llvm::BasicBlock *LHSFalse = createBasicBlock("lor.lhs.false");
Justin Bogneref512b92014-01-06 22:27:43 +0000957 // We have the count for entry to the RHS and for the whole expression
958 // being true, so we can divy up True count between the short circuit and
959 // the RHS.
960 uint64_t LHSCount = TrueCount - Cnt.getCount();
961 uint64_t RHSCount = TrueCount - LHSCount;
John McCallce1de612011-01-26 04:00:11 +0000962
963 ConditionalEvaluation eval(*this);
Justin Bogneref512b92014-01-06 22:27:43 +0000964 EmitBranchOnBoolExpr(CondBOp->getLHS(), TrueBlock, LHSFalse, LHSCount);
Chris Lattnercd439292008-11-12 08:04:58 +0000965 EmitBlock(LHSFalse);
Mike Stump11289f42009-09-09 15:08:12 +0000966
Anders Carlsson60ddba62010-01-24 00:20:05 +0000967 // Any temporaries created here are conditional.
Justin Bogneref512b92014-01-06 22:27:43 +0000968 Cnt.beginRegion(Builder);
John McCallce1de612011-01-26 04:00:11 +0000969 eval.begin(*this);
Justin Bogneref512b92014-01-06 22:27:43 +0000970 EmitBranchOnBoolExpr(CondBOp->getRHS(), TrueBlock, FalseBlock, RHSCount);
971
John McCallce1de612011-01-26 04:00:11 +0000972 eval.end(*this);
Justin Bogneref512b92014-01-06 22:27:43 +0000973 Cnt.adjustFallThroughCount();
974 Cnt.applyAdjustmentsToRegion();
Anders Carlsson60ddba62010-01-24 00:20:05 +0000975
Chris Lattnercd439292008-11-12 08:04:58 +0000976 return;
977 }
Chris Lattnerd9537732008-11-12 08:13:36 +0000978 }
Mike Stump11289f42009-09-09 15:08:12 +0000979
Chris Lattnerd9537732008-11-12 08:13:36 +0000980 if (const UnaryOperator *CondUOp = dyn_cast<UnaryOperator>(Cond)) {
981 // br(!x, t, f) -> br(x, f, t)
Justin Bogneref512b92014-01-06 22:27:43 +0000982 if (CondUOp->getOpcode() == UO_LNot) {
983 // Negate the count.
984 uint64_t FalseCount = PGO.getCurrentRegionCount() - TrueCount;
985 // Negate the condition and swap the destination blocks.
986 return EmitBranchOnBoolExpr(CondUOp->getSubExpr(), FalseBlock, TrueBlock,
987 FalseCount);
988 }
Chris Lattnercd439292008-11-12 08:04:58 +0000989 }
Mike Stump11289f42009-09-09 15:08:12 +0000990
Daniel Dunbarbf3c22e2008-11-12 10:30:32 +0000991 if (const ConditionalOperator *CondOp = dyn_cast<ConditionalOperator>(Cond)) {
Eli Friedman248f8982012-02-14 03:54:45 +0000992 // br(c ? x : y, t, f) -> br(c, br(x, t, f), br(y, t, f))
993 llvm::BasicBlock *LHSBlock = createBasicBlock("cond.true");
994 llvm::BasicBlock *RHSBlock = createBasicBlock("cond.false");
Daniel Dunbarbf3c22e2008-11-12 10:30:32 +0000995
Justin Bogneref512b92014-01-06 22:27:43 +0000996 RegionCounter Cnt = getPGORegionCounter(CondOp);
Eli Friedman248f8982012-02-14 03:54:45 +0000997 ConditionalEvaluation cond(*this);
Justin Bogneref512b92014-01-06 22:27:43 +0000998 EmitBranchOnBoolExpr(CondOp->getCond(), LHSBlock, RHSBlock, Cnt.getCount());
999
1000 // When computing PGO branch weights, we only know the overall count for
1001 // the true block. This code is essentially doing tail duplication of the
1002 // naive code-gen, introducing new edges for which counts are not
1003 // available. Divide the counts proportionally between the LHS and RHS of
1004 // the conditional operator.
1005 uint64_t LHSScaledTrueCount = 0;
1006 if (TrueCount) {
1007 double LHSRatio = Cnt.getCount() / (double) PGO.getCurrentRegionCount();
1008 LHSScaledTrueCount = TrueCount * LHSRatio;
1009 }
John McCallce1de612011-01-26 04:00:11 +00001010
Eli Friedman248f8982012-02-14 03:54:45 +00001011 cond.begin(*this);
1012 EmitBlock(LHSBlock);
Justin Bogneref512b92014-01-06 22:27:43 +00001013 Cnt.beginRegion(Builder);
1014 EmitBranchOnBoolExpr(CondOp->getLHS(), TrueBlock, FalseBlock,
1015 LHSScaledTrueCount);
Eli Friedman248f8982012-02-14 03:54:45 +00001016 cond.end(*this);
John McCallce1de612011-01-26 04:00:11 +00001017
Eli Friedman248f8982012-02-14 03:54:45 +00001018 cond.begin(*this);
1019 EmitBlock(RHSBlock);
Justin Bogneref512b92014-01-06 22:27:43 +00001020 Cnt.beginElseRegion();
1021 EmitBranchOnBoolExpr(CondOp->getRHS(), TrueBlock, FalseBlock,
1022 TrueCount - LHSScaledTrueCount);
Eli Friedman248f8982012-02-14 03:54:45 +00001023 cond.end(*this);
John McCallce1de612011-01-26 04:00:11 +00001024
Eli Friedman248f8982012-02-14 03:54:45 +00001025 return;
Daniel Dunbarbf3c22e2008-11-12 10:30:32 +00001026 }
1027
Richard Smithea852322013-05-07 21:53:22 +00001028 if (const CXXThrowExpr *Throw = dyn_cast<CXXThrowExpr>(Cond)) {
1029 // Conditional operator handling can give us a throw expression as a
1030 // condition for a case like:
1031 // br(c ? throw x : y, t, f) -> br(c, br(throw x, t, f), br(y, t, f)
1032 // Fold this to:
1033 // br(c, throw x, br(y, t, f))
1034 EmitCXXThrowExpr(Throw, /*KeepInsertionPoint*/false);
1035 return;
1036 }
1037
Justin Bogneref512b92014-01-06 22:27:43 +00001038 // Create branch weights based on the number of times we get here and the
1039 // number of times the condition should be true.
1040 uint64_t CurrentCount = PGO.getCurrentRegionCountWithMin(TrueCount);
1041 llvm::MDNode *Weights = PGO.createBranchWeights(TrueCount,
1042 CurrentCount - TrueCount);
1043
Chris Lattnercd439292008-11-12 08:04:58 +00001044 // Emit the code with the fully general case.
1045 llvm::Value *CondV = EvaluateExprAsBool(Cond);
Justin Bogneref512b92014-01-06 22:27:43 +00001046 Builder.CreateCondBr(CondV, TrueBlock, FalseBlock, Weights);
Chris Lattnercd439292008-11-12 08:04:58 +00001047}
1048
Daniel Dunbara7c8cf62008-08-16 00:56:44 +00001049/// ErrorUnsupported - Print out an error that codegen doesn't support the
Chris Lattnerfc944342007-12-02 01:43:38 +00001050/// specified stmt yet.
David Blaikie4a9ec7b2013-08-19 21:02:26 +00001051void CodeGenFunction::ErrorUnsupported(const Stmt *S, const char *Type) {
1052 CGM.ErrorUnsupported(S, Type);
Chris Lattnerfc944342007-12-02 01:43:38 +00001053}
1054
John McCall2725aa12011-02-01 21:35:06 +00001055/// emitNonZeroVLAInit - Emit the "zero" initialization of a
1056/// variable-length array whose elements have a non-zero bit-pattern.
1057///
James Dennettbe302452012-06-15 22:10:14 +00001058/// \param baseType the inner-most element type of the array
John McCall2725aa12011-02-01 21:35:06 +00001059/// \param src - a char* pointing to the bit-pattern for a single
1060/// base element of the array
1061/// \param sizeInChars - the total size of the VLA, in chars
John McCall2725aa12011-02-01 21:35:06 +00001062static void emitNonZeroVLAInit(CodeGenFunction &CGF, QualType baseType,
Michael Ilseman686240a2012-12-04 00:29:55 +00001063 llvm::Value *dest, llvm::Value *src,
John McCall2725aa12011-02-01 21:35:06 +00001064 llvm::Value *sizeInChars) {
1065 std::pair<CharUnits,CharUnits> baseSizeAndAlign
1066 = CGF.getContext().getTypeInfoInChars(baseType);
1067
1068 CGBuilderTy &Builder = CGF.Builder;
1069
1070 llvm::Value *baseSizeInChars
1071 = llvm::ConstantInt::get(CGF.IntPtrTy, baseSizeAndAlign.first.getQuantity());
1072
Chris Lattner2192fe52011-07-18 04:24:23 +00001073 llvm::Type *i8p = Builder.getInt8PtrTy();
John McCall2725aa12011-02-01 21:35:06 +00001074
1075 llvm::Value *begin = Builder.CreateBitCast(dest, i8p, "vla.begin");
1076 llvm::Value *end = Builder.CreateInBoundsGEP(dest, sizeInChars, "vla.end");
1077
1078 llvm::BasicBlock *originBB = CGF.Builder.GetInsertBlock();
1079 llvm::BasicBlock *loopBB = CGF.createBasicBlock("vla-init.loop");
1080 llvm::BasicBlock *contBB = CGF.createBasicBlock("vla-init.cont");
1081
1082 // Make a loop over the VLA. C99 guarantees that the VLA element
1083 // count must be nonzero.
1084 CGF.EmitBlock(loopBB);
1085
Jay Foad20c0f022011-03-30 11:28:58 +00001086 llvm::PHINode *cur = Builder.CreatePHI(i8p, 2, "vla.cur");
John McCall2725aa12011-02-01 21:35:06 +00001087 cur->addIncoming(begin, originBB);
1088
1089 // memcpy the individual element bit-pattern.
1090 Builder.CreateMemCpy(cur, src, baseSizeInChars,
1091 baseSizeAndAlign.second.getQuantity(),
1092 /*volatile*/ false);
1093
1094 // Go to the next element.
1095 llvm::Value *next = Builder.CreateConstInBoundsGEP1_32(cur, 1, "vla.next");
1096
1097 // Leave if that's the end of the VLA.
1098 llvm::Value *done = Builder.CreateICmpEQ(next, end, "vla-init.isdone");
1099 Builder.CreateCondBr(done, contBB, loopBB);
1100 cur->addIncoming(next, loopBB);
1101
1102 CGF.EmitBlock(contBB);
Michael Ilseman686240a2012-12-04 00:29:55 +00001103}
John McCall2725aa12011-02-01 21:35:06 +00001104
Anders Carlssonc0964b62010-05-22 17:35:42 +00001105void
1106CodeGenFunction::EmitNullInitialization(llvm::Value *DestPtr, QualType Ty) {
Anders Carlsson16e94af2010-05-03 01:20:20 +00001107 // Ignore empty classes in C++.
Richard Smith9c6890a2012-11-01 22:30:59 +00001108 if (getLangOpts().CPlusPlus) {
Anders Carlsson16e94af2010-05-03 01:20:20 +00001109 if (const RecordType *RT = Ty->getAs<RecordType>()) {
1110 if (cast<CXXRecordDecl>(RT->getDecl())->isEmpty())
1111 return;
1112 }
1113 }
John McCall7cd1d972010-08-07 08:21:30 +00001114
1115 // Cast the dest ptr to the appropriate i8 pointer type.
1116 unsigned DestAS =
1117 cast<llvm::PointerType>(DestPtr->getType())->getAddressSpace();
Chris Lattner2192fe52011-07-18 04:24:23 +00001118 llvm::Type *BP = Builder.getInt8PtrTy(DestAS);
Anders Carlsson2e744e82008-08-30 19:51:14 +00001119 if (DestPtr->getType() != BP)
Benjamin Kramer76399eb2011-09-27 21:06:10 +00001120 DestPtr = Builder.CreateBitCast(DestPtr, BP);
Anders Carlsson2e744e82008-08-30 19:51:14 +00001121
1122 // Get size and alignment info for this aggregate.
Michael Ilseman686240a2012-12-04 00:29:55 +00001123 std::pair<CharUnits, CharUnits> TypeInfo =
Ken Dyckc5c416f2011-04-22 17:51:05 +00001124 getContext().getTypeInfoInChars(Ty);
1125 CharUnits Size = TypeInfo.first;
1126 CharUnits Align = TypeInfo.second;
Anders Carlsson2e744e82008-08-30 19:51:14 +00001127
John McCalla08ffd22011-01-14 10:37:58 +00001128 llvm::Value *SizeVal;
John McCall2725aa12011-02-01 21:35:06 +00001129 const VariableArrayType *vla;
Mike Stump11289f42009-09-09 15:08:12 +00001130
John McCalla08ffd22011-01-14 10:37:58 +00001131 // Don't bother emitting a zero-byte memset.
Ken Dyckc5c416f2011-04-22 17:51:05 +00001132 if (Size.isZero()) {
John McCalla08ffd22011-01-14 10:37:58 +00001133 // But note that getTypeInfo returns 0 for a VLA.
1134 if (const VariableArrayType *vlaType =
1135 dyn_cast_or_null<VariableArrayType>(
1136 getContext().getAsArrayType(Ty))) {
John McCall23c29fe2011-06-24 21:55:10 +00001137 QualType eltType;
1138 llvm::Value *numElts;
1139 llvm::tie(numElts, eltType) = getVLASize(vlaType);
1140
1141 SizeVal = numElts;
1142 CharUnits eltSize = getContext().getTypeSizeInChars(eltType);
1143 if (!eltSize.isOne())
1144 SizeVal = Builder.CreateNUWMul(SizeVal, CGM.getSize(eltSize));
John McCall2725aa12011-02-01 21:35:06 +00001145 vla = vlaType;
John McCalla08ffd22011-01-14 10:37:58 +00001146 } else {
1147 return;
1148 }
1149 } else {
John McCall23c29fe2011-06-24 21:55:10 +00001150 SizeVal = CGM.getSize(Size);
John McCall2725aa12011-02-01 21:35:06 +00001151 vla = 0;
John McCalla08ffd22011-01-14 10:37:58 +00001152 }
John McCall7cd1d972010-08-07 08:21:30 +00001153
1154 // If the type contains a pointer to data member we can't memset it to zero.
1155 // Instead, create a null constant and copy it to the destination.
John McCall2725aa12011-02-01 21:35:06 +00001156 // TODO: there are other patterns besides zero that we can usefully memset,
1157 // like -1, which happens to be the pattern used by member-pointers.
John McCall614dbdc2010-08-22 21:01:12 +00001158 if (!CGM.getTypes().isZeroInitializable(Ty)) {
John McCall2725aa12011-02-01 21:35:06 +00001159 // For a VLA, emit a single element, then splat that over the VLA.
1160 if (vla) Ty = getContext().getBaseElementType(vla);
John McCalla08ffd22011-01-14 10:37:58 +00001161
John McCall7cd1d972010-08-07 08:21:30 +00001162 llvm::Constant *NullConstant = CGM.EmitNullConstant(Ty);
1163
Michael Ilseman686240a2012-12-04 00:29:55 +00001164 llvm::GlobalVariable *NullVariable =
John McCall7cd1d972010-08-07 08:21:30 +00001165 new llvm::GlobalVariable(CGM.getModule(), NullConstant->getType(),
Michael Ilseman686240a2012-12-04 00:29:55 +00001166 /*isConstant=*/true,
John McCall7cd1d972010-08-07 08:21:30 +00001167 llvm::GlobalVariable::PrivateLinkage,
Chris Lattner0e62c1c2011-07-23 10:55:15 +00001168 NullConstant, Twine());
John McCall7cd1d972010-08-07 08:21:30 +00001169 llvm::Value *SrcPtr =
1170 Builder.CreateBitCast(NullVariable, Builder.getInt8PtrTy());
1171
John McCall2725aa12011-02-01 21:35:06 +00001172 if (vla) return emitNonZeroVLAInit(*this, Ty, DestPtr, SrcPtr, SizeVal);
1173
John McCall7cd1d972010-08-07 08:21:30 +00001174 // Get and call the appropriate llvm.memcpy overload.
Ken Dyckc5c416f2011-04-22 17:51:05 +00001175 Builder.CreateMemCpy(DestPtr, SrcPtr, SizeVal, Align.getQuantity(), false);
John McCall7cd1d972010-08-07 08:21:30 +00001176 return;
Michael Ilseman686240a2012-12-04 00:29:55 +00001177 }
1178
John McCall7cd1d972010-08-07 08:21:30 +00001179 // Otherwise, just memset the whole thing to zero. This is legal
1180 // because in LLVM, all default initializers (other than the ones we just
1181 // handled above) are guaranteed to have a bit pattern of all zeros.
Michael Ilseman686240a2012-12-04 00:29:55 +00001182 Builder.CreateMemSet(DestPtr, Builder.getInt8(0), SizeVal,
Ken Dyckc5c416f2011-04-22 17:51:05 +00001183 Align.getQuantity(), false);
Anders Carlsson2e744e82008-08-30 19:51:14 +00001184}
1185
Chris Lattnerc8e630e2011-02-17 07:39:24 +00001186llvm::BlockAddress *CodeGenFunction::GetAddrOfLabel(const LabelDecl *L) {
Chris Lattner6c4d2552009-10-28 23:59:40 +00001187 // Make sure that there is a block for the indirect goto.
1188 if (IndirectBranch == 0)
1189 GetIndirectGotoBlock();
Michael Ilseman686240a2012-12-04 00:29:55 +00001190
John McCallad5d61e2010-07-23 21:56:41 +00001191 llvm::BasicBlock *BB = getJumpDestForLabel(L).getBlock();
Michael Ilseman686240a2012-12-04 00:29:55 +00001192
Chris Lattner6c4d2552009-10-28 23:59:40 +00001193 // Make sure the indirect branch includes all of the address-taken blocks.
1194 IndirectBranch->addDestination(BB);
1195 return llvm::BlockAddress::get(CurFn, BB);
Chris Lattner2bb5cb42009-10-13 06:55:33 +00001196}
1197
1198llvm::BasicBlock *CodeGenFunction::GetIndirectGotoBlock() {
Chris Lattner6c4d2552009-10-28 23:59:40 +00001199 // If we already made the indirect branch for indirect goto, return its block.
1200 if (IndirectBranch) return IndirectBranch->getParent();
Michael Ilseman686240a2012-12-04 00:29:55 +00001201
Chris Lattner6c4d2552009-10-28 23:59:40 +00001202 CGBuilderTy TmpBuilder(createBasicBlock("indirectgoto"));
Michael Ilseman686240a2012-12-04 00:29:55 +00001203
Chris Lattner2bb5cb42009-10-13 06:55:33 +00001204 // Create the PHI node that indirect gotos will add entries to.
Jay Foad20c0f022011-03-30 11:28:58 +00001205 llvm::Value *DestVal = TmpBuilder.CreatePHI(Int8PtrTy, 0,
1206 "indirect.goto.dest");
Michael Ilseman686240a2012-12-04 00:29:55 +00001207
Chris Lattner6c4d2552009-10-28 23:59:40 +00001208 // Create the indirect branch instruction.
1209 IndirectBranch = TmpBuilder.CreateIndirectBr(DestVal);
1210 return IndirectBranch->getParent();
Daniel Dunbar88402ce2008-08-04 16:51:22 +00001211}
Anders Carlsson13abd7e2008-11-04 05:30:00 +00001212
John McCall82fe67b2011-07-09 01:37:26 +00001213/// Computes the length of an array in elements, as well as the base
1214/// element type and a properly-typed first element pointer.
1215llvm::Value *CodeGenFunction::emitArrayLength(const ArrayType *origArrayType,
1216 QualType &baseType,
1217 llvm::Value *&addr) {
1218 const ArrayType *arrayType = origArrayType;
1219
1220 // If it's a VLA, we have to load the stored size. Note that
1221 // this is the size of the VLA in bytes, not its size in elements.
1222 llvm::Value *numVLAElements = 0;
1223 if (isa<VariableArrayType>(arrayType)) {
1224 numVLAElements = getVLASize(cast<VariableArrayType>(arrayType)).first;
1225
1226 // Walk into all VLAs. This doesn't require changes to addr,
1227 // which has type T* where T is the first non-VLA element type.
1228 do {
1229 QualType elementType = arrayType->getElementType();
1230 arrayType = getContext().getAsArrayType(elementType);
1231
1232 // If we only have VLA components, 'addr' requires no adjustment.
1233 if (!arrayType) {
1234 baseType = elementType;
1235 return numVLAElements;
1236 }
1237 } while (isa<VariableArrayType>(arrayType));
1238
1239 // We get out here only if we find a constant array type
1240 // inside the VLA.
1241 }
1242
1243 // We have some number of constant-length arrays, so addr should
1244 // have LLVM type [M x [N x [...]]]*. Build a GEP that walks
1245 // down to the first element of addr.
Chris Lattner0e62c1c2011-07-23 10:55:15 +00001246 SmallVector<llvm::Value*, 8> gepIndices;
John McCall82fe67b2011-07-09 01:37:26 +00001247
1248 // GEP down to the array type.
1249 llvm::ConstantInt *zero = Builder.getInt32(0);
1250 gepIndices.push_back(zero);
1251
John McCall82fe67b2011-07-09 01:37:26 +00001252 uint64_t countFromCLAs = 1;
Richard Smithf3c37e82012-04-22 05:51:36 +00001253 QualType eltType;
John McCall82fe67b2011-07-09 01:37:26 +00001254
Chris Lattner2192fe52011-07-18 04:24:23 +00001255 llvm::ArrayType *llvmArrayType =
Richard Smithf3c37e82012-04-22 05:51:36 +00001256 dyn_cast<llvm::ArrayType>(
John McCall82fe67b2011-07-09 01:37:26 +00001257 cast<llvm::PointerType>(addr->getType())->getElementType());
Richard Smithf3c37e82012-04-22 05:51:36 +00001258 while (llvmArrayType) {
John McCall82fe67b2011-07-09 01:37:26 +00001259 assert(isa<ConstantArrayType>(arrayType));
1260 assert(cast<ConstantArrayType>(arrayType)->getSize().getZExtValue()
1261 == llvmArrayType->getNumElements());
1262
1263 gepIndices.push_back(zero);
1264 countFromCLAs *= llvmArrayType->getNumElements();
Richard Smithf3c37e82012-04-22 05:51:36 +00001265 eltType = arrayType->getElementType();
John McCall82fe67b2011-07-09 01:37:26 +00001266
1267 llvmArrayType =
1268 dyn_cast<llvm::ArrayType>(llvmArrayType->getElementType());
John McCall82fe67b2011-07-09 01:37:26 +00001269 arrayType = getContext().getAsArrayType(arrayType->getElementType());
Richard Smithf3c37e82012-04-22 05:51:36 +00001270 assert((!llvmArrayType || arrayType) &&
1271 "LLVM and Clang types are out-of-synch");
John McCall82fe67b2011-07-09 01:37:26 +00001272 }
1273
Richard Smithf3c37e82012-04-22 05:51:36 +00001274 if (arrayType) {
1275 // From this point onwards, the Clang array type has been emitted
1276 // as some other type (probably a packed struct). Compute the array
1277 // size, and just emit the 'begin' expression as a bitcast.
1278 while (arrayType) {
1279 countFromCLAs *=
1280 cast<ConstantArrayType>(arrayType)->getSize().getZExtValue();
1281 eltType = arrayType->getElementType();
1282 arrayType = getContext().getAsArrayType(eltType);
1283 }
John McCall82fe67b2011-07-09 01:37:26 +00001284
Micah Villmowea2fea22012-10-25 15:39:14 +00001285 unsigned AddressSpace = addr->getType()->getPointerAddressSpace();
Richard Smithf3c37e82012-04-22 05:51:36 +00001286 llvm::Type *BaseType = ConvertType(eltType)->getPointerTo(AddressSpace);
1287 addr = Builder.CreateBitCast(addr, BaseType, "array.begin");
1288 } else {
1289 // Create the actual GEP.
1290 addr = Builder.CreateInBoundsGEP(addr, gepIndices, "array.begin");
1291 }
1292
1293 baseType = eltType;
John McCall82fe67b2011-07-09 01:37:26 +00001294
1295 llvm::Value *numElements
1296 = llvm::ConstantInt::get(SizeTy, countFromCLAs);
1297
1298 // If we had any VLA dimensions, factor them in.
1299 if (numVLAElements)
1300 numElements = Builder.CreateNUWMul(numVLAElements, numElements);
1301
1302 return numElements;
1303}
1304
John McCall23c29fe2011-06-24 21:55:10 +00001305std::pair<llvm::Value*, QualType>
1306CodeGenFunction::getVLASize(QualType type) {
1307 const VariableArrayType *vla = getContext().getAsVariableArrayType(type);
1308 assert(vla && "type was not a variable array type!");
1309 return getVLASize(vla);
Anders Carlssone388a5b2008-12-20 20:27:15 +00001310}
Anders Carlssonccbe9202008-12-12 07:19:02 +00001311
John McCall23c29fe2011-06-24 21:55:10 +00001312std::pair<llvm::Value*, QualType>
1313CodeGenFunction::getVLASize(const VariableArrayType *type) {
1314 // The number of elements so far; always size_t.
1315 llvm::Value *numElements = 0;
1316
1317 QualType elementType;
1318 do {
1319 elementType = type->getElementType();
1320 llvm::Value *vlaSize = VLASizeMap[type->getSizeExpr()];
1321 assert(vlaSize && "no size for VLA!");
1322 assert(vlaSize->getType() == SizeTy);
1323
1324 if (!numElements) {
1325 numElements = vlaSize;
1326 } else {
1327 // It's undefined behavior if this wraps around, so mark it that way.
Richard Smith481652b2012-10-10 01:11:12 +00001328 // FIXME: Teach -fcatch-undefined-behavior to trap this.
John McCall23c29fe2011-06-24 21:55:10 +00001329 numElements = Builder.CreateNUWMul(numElements, vlaSize);
1330 }
1331 } while ((type = getContext().getAsVariableArrayType(elementType)));
1332
1333 return std::pair<llvm::Value*,QualType>(numElements, elementType);
1334}
1335
1336void CodeGenFunction::EmitVariablyModifiedType(QualType type) {
1337 assert(type->isVariablyModifiedType() &&
Anders Carlsson8a01b792008-12-20 20:46:34 +00001338 "Must pass variably modified type to EmitVLASizes!");
Mike Stump11289f42009-09-09 15:08:12 +00001339
Daniel Dunbarb6adc432009-07-19 06:58:07 +00001340 EnsureInsertPoint();
Mike Stump11289f42009-09-09 15:08:12 +00001341
John McCall23c29fe2011-06-24 21:55:10 +00001342 // We're going to walk down into the type and look for VLA
1343 // expressions.
John McCall23c29fe2011-06-24 21:55:10 +00001344 do {
1345 assert(type->isVariablyModifiedType());
Mike Stump11289f42009-09-09 15:08:12 +00001346
John McCall23c29fe2011-06-24 21:55:10 +00001347 const Type *ty = type.getTypePtr();
1348 switch (ty->getTypeClass()) {
Abramo Bagnara1cd83682012-01-07 10:52:36 +00001349
John McCall23c29fe2011-06-24 21:55:10 +00001350#define TYPE(Class, Base)
1351#define ABSTRACT_TYPE(Class, Base)
Abramo Bagnara1cd83682012-01-07 10:52:36 +00001352#define NON_CANONICAL_TYPE(Class, Base)
John McCall23c29fe2011-06-24 21:55:10 +00001353#define DEPENDENT_TYPE(Class, Base) case Type::Class:
Abramo Bagnara1cd83682012-01-07 10:52:36 +00001354#define NON_CANONICAL_UNLESS_DEPENDENT_TYPE(Class, Base)
John McCall23c29fe2011-06-24 21:55:10 +00001355#include "clang/AST/TypeNodes.def"
Abramo Bagnara1cd83682012-01-07 10:52:36 +00001356 llvm_unreachable("unexpected dependent type!");
Mike Stump11289f42009-09-09 15:08:12 +00001357
John McCall23c29fe2011-06-24 21:55:10 +00001358 // These types are never variably-modified.
1359 case Type::Builtin:
1360 case Type::Complex:
1361 case Type::Vector:
1362 case Type::ExtVector:
1363 case Type::Record:
1364 case Type::Enum:
Abramo Bagnarafa95ed42012-01-11 08:19:46 +00001365 case Type::Elaborated:
1366 case Type::TemplateSpecialization:
John McCall23c29fe2011-06-24 21:55:10 +00001367 case Type::ObjCObject:
1368 case Type::ObjCInterface:
1369 case Type::ObjCObjectPointer:
1370 llvm_unreachable("type class is never variably-modified!");
Mike Stump11289f42009-09-09 15:08:12 +00001371
Reid Kleckner0503a872013-12-05 01:23:43 +00001372 case Type::Adjusted:
1373 type = cast<AdjustedType>(ty)->getAdjustedType();
1374 break;
1375
Reid Kleckner8a365022013-06-24 17:51:48 +00001376 case Type::Decayed:
1377 type = cast<DecayedType>(ty)->getPointeeType();
1378 break;
1379
John McCall23c29fe2011-06-24 21:55:10 +00001380 case Type::Pointer:
1381 type = cast<PointerType>(ty)->getPointeeType();
1382 break;
Mike Stump11289f42009-09-09 15:08:12 +00001383
John McCall23c29fe2011-06-24 21:55:10 +00001384 case Type::BlockPointer:
1385 type = cast<BlockPointerType>(ty)->getPointeeType();
1386 break;
1387
1388 case Type::LValueReference:
1389 case Type::RValueReference:
1390 type = cast<ReferenceType>(ty)->getPointeeType();
1391 break;
1392
1393 case Type::MemberPointer:
1394 type = cast<MemberPointerType>(ty)->getPointeeType();
1395 break;
1396
1397 case Type::ConstantArray:
1398 case Type::IncompleteArray:
1399 // Losing element qualification here is fine.
1400 type = cast<ArrayType>(ty)->getElementType();
1401 break;
1402
1403 case Type::VariableArray: {
1404 // Losing element qualification here is fine.
1405 const VariableArrayType *vat = cast<VariableArrayType>(ty);
1406
1407 // Unknown size indication requires no size computation.
1408 // Otherwise, evaluate and record it.
1409 if (const Expr *size = vat->getSizeExpr()) {
1410 // It's possible that we might have emitted this already,
1411 // e.g. with a typedef and a pointer to it.
1412 llvm::Value *&entry = VLASizeMap[size];
1413 if (!entry) {
Richard Smith481652b2012-10-10 01:11:12 +00001414 llvm::Value *Size = EmitScalarExpr(size);
1415
1416 // C11 6.7.6.2p5:
1417 // If the size is an expression that is not an integer constant
1418 // expression [...] each time it is evaluated it shall have a value
1419 // greater than zero.
Will Dietzf54319c2013-01-18 11:30:38 +00001420 if (SanOpts->VLABound &&
Richard Smithb1b0ab42012-11-05 22:21:05 +00001421 size->getType()->isSignedIntegerType()) {
Richard Smith481652b2012-10-10 01:11:12 +00001422 llvm::Value *Zero = llvm::Constant::getNullValue(Size->getType());
1423 llvm::Constant *StaticArgs[] = {
1424 EmitCheckSourceLocation(size->getLocStart()),
1425 EmitCheckTypeDescriptor(size->getType())
1426 };
1427 EmitCheck(Builder.CreateICmpSGT(Size, Zero),
Will Dietz88e02332012-12-02 19:50:33 +00001428 "vla_bound_not_positive", StaticArgs, Size,
1429 CRK_Recoverable);
Richard Smith481652b2012-10-10 01:11:12 +00001430 }
1431
John McCall23c29fe2011-06-24 21:55:10 +00001432 // Always zexting here would be wrong if it weren't
1433 // undefined behavior to have a negative bound.
Richard Smith8772bd82012-10-10 01:12:11 +00001434 entry = Builder.CreateIntCast(Size, SizeTy, /*signed*/ false);
John McCall23c29fe2011-06-24 21:55:10 +00001435 }
1436 }
1437 type = vat->getElementType();
1438 break;
Anders Carlsson8a01b792008-12-20 20:46:34 +00001439 }
Mike Stump11289f42009-09-09 15:08:12 +00001440
Abramo Bagnara1cd83682012-01-07 10:52:36 +00001441 case Type::FunctionProto:
John McCall23c29fe2011-06-24 21:55:10 +00001442 case Type::FunctionNoProto:
1443 type = cast<FunctionType>(ty)->getResultType();
1444 break;
Eli Friedman0dfb8892011-10-06 23:00:33 +00001445
Abramo Bagnarafa95ed42012-01-11 08:19:46 +00001446 case Type::Paren:
1447 case Type::TypeOf:
1448 case Type::UnaryTransform:
1449 case Type::Attributed:
1450 case Type::SubstTemplateTypeParm:
David Blaikie66ed89d2013-07-13 21:08:08 +00001451 case Type::PackExpansion:
Abramo Bagnarafa95ed42012-01-11 08:19:46 +00001452 // Keep walking after single level desugaring.
1453 type = type.getSingleStepDesugaredType(getContext());
1454 break;
1455
1456 case Type::Typedef:
1457 case Type::Decltype:
1458 case Type::Auto:
1459 // Stop walking: nothing to do.
1460 return;
1461
1462 case Type::TypeOfExpr:
1463 // Stop walking: emit typeof expression.
1464 EmitIgnoredExpr(cast<TypeOfExprType>(ty)->getUnderlyingExpr());
1465 return;
1466
Eli Friedman0dfb8892011-10-06 23:00:33 +00001467 case Type::Atomic:
1468 type = cast<AtomicType>(ty)->getValueType();
1469 break;
John McCall23c29fe2011-06-24 21:55:10 +00001470 }
1471 } while (type->isVariablyModifiedType());
Anders Carlssonccbe9202008-12-12 07:19:02 +00001472}
Eli Friedmanddea0ad2009-01-20 17:46:04 +00001473
1474llvm::Value* CodeGenFunction::EmitVAListRef(const Expr* E) {
Dan Gohmane9e32dc2010-10-29 22:47:07 +00001475 if (getContext().getBuiltinVaListType()->isArrayType())
Eli Friedmanddea0ad2009-01-20 17:46:04 +00001476 return EmitScalarExpr(E);
Eli Friedmanddea0ad2009-01-20 17:46:04 +00001477 return EmitLValue(E).getAddress();
1478}
Anders Carlsson15cb75a2009-02-07 22:53:43 +00001479
Yunzhong Gao0ebf1bb2013-08-30 08:53:09 +00001480void CodeGenFunction::EmitDeclRefExprDbgValue(const DeclRefExpr *E,
1481 llvm::Constant *Init) {
Devang Pateldc866e12010-08-10 17:53:33 +00001482 assert (Init && "Invalid DeclRefExpr initializer!");
Yunzhong Gao0ebf1bb2013-08-30 08:53:09 +00001483 if (CGDebugInfo *Dbg = getDebugInfo())
1484 if (CGM.getCodeGenOpts().getDebugInfo() >= CodeGenOptions::LimitedDebugInfo)
1485 Dbg->EmitGlobalVariable(E->getDecl(), Init);
Devang Patele03edfd2010-08-10 07:24:25 +00001486}
John McCallc07a0c72011-02-17 10:25:35 +00001487
1488CodeGenFunction::PeepholeProtection
1489CodeGenFunction::protectFromPeepholes(RValue rvalue) {
1490 // At the moment, the only aggressive peephole we do in IR gen
1491 // is trunc(zext) folding, but if we add more, we can easily
1492 // extend this protection.
1493
1494 if (!rvalue.isScalar()) return PeepholeProtection();
1495 llvm::Value *value = rvalue.getScalarVal();
1496 if (!isa<llvm::ZExtInst>(value)) return PeepholeProtection();
1497
1498 // Just make an extra bitcast.
1499 assert(HaveInsertPoint());
1500 llvm::Instruction *inst = new llvm::BitCastInst(value, value->getType(), "",
1501 Builder.GetInsertBlock());
1502
1503 PeepholeProtection protection;
1504 protection.Inst = inst;
1505 return protection;
1506}
1507
1508void CodeGenFunction::unprotectFromPeepholes(PeepholeProtection protection) {
1509 if (!protection.Inst) return;
1510
1511 // In theory, we could try to duplicate the peepholes now, but whatever.
1512 protection.Inst->eraseFromParent();
1513}
Julien Lerouge5a6b6982011-09-09 22:41:49 +00001514
1515llvm::Value *CodeGenFunction::EmitAnnotationCall(llvm::Value *AnnotationFn,
1516 llvm::Value *AnnotatedVal,
Dmitri Gribenkof8579502013-01-12 19:30:44 +00001517 StringRef AnnotationStr,
Julien Lerouge5a6b6982011-09-09 22:41:49 +00001518 SourceLocation Location) {
1519 llvm::Value *Args[4] = {
1520 AnnotatedVal,
1521 Builder.CreateBitCast(CGM.EmitAnnotationString(AnnotationStr), Int8PtrTy),
1522 Builder.CreateBitCast(CGM.EmitAnnotationUnit(Location), Int8PtrTy),
1523 CGM.EmitAnnotationLineNo(Location)
1524 };
1525 return Builder.CreateCall(AnnotationFn, Args);
1526}
1527
1528void CodeGenFunction::EmitVarAnnotations(const VarDecl *D, llvm::Value *V) {
1529 assert(D->hasAttr<AnnotateAttr>() && "no annotate attribute");
1530 // FIXME We create a new bitcast for every annotation because that's what
1531 // llvm-gcc was doing.
1532 for (specific_attr_iterator<AnnotateAttr>
1533 ai = D->specific_attr_begin<AnnotateAttr>(),
1534 ae = D->specific_attr_end<AnnotateAttr>(); ai != ae; ++ai)
1535 EmitAnnotationCall(CGM.getIntrinsic(llvm::Intrinsic::var_annotation),
1536 Builder.CreateBitCast(V, CGM.Int8PtrTy, V->getName()),
1537 (*ai)->getAnnotation(), D->getLocation());
1538}
1539
1540llvm::Value *CodeGenFunction::EmitFieldAnnotations(const FieldDecl *D,
1541 llvm::Value *V) {
1542 assert(D->hasAttr<AnnotateAttr>() && "no annotate attribute");
1543 llvm::Type *VTy = V->getType();
1544 llvm::Value *F = CGM.getIntrinsic(llvm::Intrinsic::ptr_annotation,
1545 CGM.Int8PtrTy);
1546
1547 for (specific_attr_iterator<AnnotateAttr>
1548 ai = D->specific_attr_begin<AnnotateAttr>(),
1549 ae = D->specific_attr_end<AnnotateAttr>(); ai != ae; ++ai) {
1550 // FIXME Always emit the cast inst so we can differentiate between
1551 // annotation on the first field of a struct and annotation on the struct
1552 // itself.
1553 if (VTy != CGM.Int8PtrTy)
1554 V = Builder.Insert(new llvm::BitCastInst(V, CGM.Int8PtrTy));
1555 V = EmitAnnotationCall(F, V, (*ai)->getAnnotation(), D->getLocation());
1556 V = Builder.CreateBitCast(V, VTy);
1557 }
1558
1559 return V;
1560}
Ben Langmuir3b4c30b2013-05-09 19:17:11 +00001561
1562CodeGenFunction::CGCapturedStmtInfo::~CGCapturedStmtInfo() { }