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Chris Lattner7f02f722007-08-24 05:35:26 +00001//===--- CGExprScalar.cpp - Emit LLVM Code for Scalar Exprs ---------------===//
2//
3// The LLVM Compiler Infrastructure
4//
Chris Lattner0bc735f2007-12-29 19:59:25 +00005// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
Chris Lattner7f02f722007-08-24 05:35:26 +00007//
8//===----------------------------------------------------------------------===//
9//
10// This contains code to emit Expr nodes with scalar LLVM types as LLVM code.
11//
12//===----------------------------------------------------------------------===//
13
14#include "CodeGenFunction.h"
John McCall4c40d982010-08-31 07:33:07 +000015#include "CGCXXABI.h"
Chandler Carruth55fc8732012-12-04 09:13:33 +000016#include "CGDebugInfo.h"
Fariborz Jahanianf7bcc7e2009-10-10 20:07:56 +000017#include "CGObjCRuntime.h"
Chris Lattner7f02f722007-08-24 05:35:26 +000018#include "CodeGenModule.h"
Daniel Dunbarde7fb842008-08-11 05:00:27 +000019#include "clang/AST/ASTContext.h"
Daniel Dunbar98c5ead2008-08-12 05:08:18 +000020#include "clang/AST/DeclObjC.h"
Anders Carlsson19cc4ab2009-07-18 19:43:29 +000021#include "clang/AST/RecordLayout.h"
Daniel Dunbarde7fb842008-08-11 05:00:27 +000022#include "clang/AST/StmtVisitor.h"
Chris Lattner25ddea72008-04-20 00:50:39 +000023#include "clang/Basic/TargetInfo.h"
Chandler Carruth55fc8732012-12-04 09:13:33 +000024#include "clang/Frontend/CodeGenOptions.h"
Chandler Carruth3b844ba2013-01-02 11:45:17 +000025#include "llvm/IR/Constants.h"
26#include "llvm/IR/DataLayout.h"
27#include "llvm/IR/Function.h"
28#include "llvm/IR/GlobalVariable.h"
29#include "llvm/IR/Intrinsics.h"
30#include "llvm/IR/Module.h"
Chris Lattnerf7b5ea92008-11-12 08:38:24 +000031#include "llvm/Support/CFG.h"
Chris Lattnerc89bf692008-01-03 07:05:49 +000032#include <cstdarg>
Ted Kremenek6aad91a2007-12-10 23:44:32 +000033
Chris Lattner7f02f722007-08-24 05:35:26 +000034using namespace clang;
35using namespace CodeGen;
36using llvm::Value;
37
38//===----------------------------------------------------------------------===//
39// Scalar Expression Emitter
40//===----------------------------------------------------------------------===//
41
Benjamin Kramer79ba2a62010-10-22 16:48:22 +000042namespace {
Chris Lattner7f02f722007-08-24 05:35:26 +000043struct BinOpInfo {
44 Value *LHS;
45 Value *RHS;
Chris Lattner1f1ded92007-08-24 21:00:35 +000046 QualType Ty; // Computation Type.
Chris Lattner9a207232010-06-26 21:48:21 +000047 BinaryOperator::Opcode Opcode; // Opcode of BinOp to perform
Lang Hamesbe9af122012-10-02 04:45:10 +000048 bool FPContractable;
Chris Lattner9a207232010-06-26 21:48:21 +000049 const Expr *E; // Entire expr, for error unsupported. May not be binop.
Chris Lattner7f02f722007-08-24 05:35:26 +000050};
51
John McCall404cd162010-11-13 01:35:44 +000052static bool MustVisitNullValue(const Expr *E) {
53 // If a null pointer expression's type is the C++0x nullptr_t, then
54 // it's not necessarily a simple constant and it must be evaluated
55 // for its potential side effects.
56 return E->getType()->isNullPtrType();
57}
58
Benjamin Kramer85b45212009-11-28 19:45:26 +000059class ScalarExprEmitter
Chris Lattner7f02f722007-08-24 05:35:26 +000060 : public StmtVisitor<ScalarExprEmitter, Value*> {
61 CodeGenFunction &CGF;
Daniel Dunbar45d196b2008-11-01 01:53:16 +000062 CGBuilderTy &Builder;
Mike Stump7f79f9b2009-05-29 15:46:01 +000063 bool IgnoreResultAssign;
Owen Andersona1cf15f2009-07-14 23:10:40 +000064 llvm::LLVMContext &VMContext;
Chris Lattner7f02f722007-08-24 05:35:26 +000065public:
66
Mike Stump7f79f9b2009-05-29 15:46:01 +000067 ScalarExprEmitter(CodeGenFunction &cgf, bool ira=false)
Mike Stumpdb52dcd2009-09-09 13:00:44 +000068 : CGF(cgf), Builder(CGF.Builder), IgnoreResultAssign(ira),
Owen Andersona1cf15f2009-07-14 23:10:40 +000069 VMContext(cgf.getLLVMContext()) {
Chris Lattner7f02f722007-08-24 05:35:26 +000070 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +000071
Chris Lattner7f02f722007-08-24 05:35:26 +000072 //===--------------------------------------------------------------------===//
73 // Utilities
74 //===--------------------------------------------------------------------===//
75
Mike Stump7f79f9b2009-05-29 15:46:01 +000076 bool TestAndClearIgnoreResultAssign() {
Chris Lattner9c10fcf2009-07-08 01:08:03 +000077 bool I = IgnoreResultAssign;
78 IgnoreResultAssign = false;
79 return I;
80 }
Mike Stump7f79f9b2009-05-29 15:46:01 +000081
Chris Lattner2acc6e32011-07-18 04:24:23 +000082 llvm::Type *ConvertType(QualType T) { return CGF.ConvertType(T); }
Chris Lattner7f02f722007-08-24 05:35:26 +000083 LValue EmitLValue(const Expr *E) { return CGF.EmitLValue(E); }
Richard Smith7ac9ef12012-09-08 02:08:36 +000084 LValue EmitCheckedLValue(const Expr *E, CodeGenFunction::TypeCheckKind TCK) {
85 return CGF.EmitCheckedLValue(E, TCK);
Richard Smith2c9f87c2012-08-24 00:54:33 +000086 }
Chris Lattner7f02f722007-08-24 05:35:26 +000087
Richard Smith4def70d2012-10-09 19:52:38 +000088 void EmitBinOpCheck(Value *Check, const BinOpInfo &Info);
89
John McCall545d9962011-06-25 02:11:03 +000090 Value *EmitLoadOfLValue(LValue LV) {
91 return CGF.EmitLoadOfLValue(LV).getScalarVal();
Chris Lattner7f02f722007-08-24 05:35:26 +000092 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +000093
Chris Lattner7f02f722007-08-24 05:35:26 +000094 /// EmitLoadOfLValue - Given an expression with complex type that represents a
95 /// value l-value, this method emits the address of the l-value, then loads
96 /// and returns the result.
97 Value *EmitLoadOfLValue(const Expr *E) {
Richard Smith7ac9ef12012-09-08 02:08:36 +000098 return EmitLoadOfLValue(EmitCheckedLValue(E, CodeGenFunction::TCK_Load));
Chris Lattner7f02f722007-08-24 05:35:26 +000099 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000100
Chris Lattner9abc84e2007-08-26 16:42:57 +0000101 /// EmitConversionToBool - Convert the specified expression value to a
Chris Lattner3420d0d2007-08-26 17:25:57 +0000102 /// boolean (i1) truth value. This is equivalent to "Val != 0".
Chris Lattner9abc84e2007-08-26 16:42:57 +0000103 Value *EmitConversionToBool(Value *Src, QualType DstTy);
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000104
Richard Smithb2aa66c2012-10-12 22:57:06 +0000105 /// \brief Emit a check that a conversion to or from a floating-point type
106 /// does not overflow.
107 void EmitFloatConversionCheck(Value *OrigSrc, QualType OrigSrcType,
108 Value *Src, QualType SrcType,
109 QualType DstType, llvm::Type *DstTy);
110
Chris Lattner3707b252007-08-26 06:48:56 +0000111 /// EmitScalarConversion - Emit a conversion from the specified type to the
112 /// specified destination type, both of which are LLVM scalar types.
Chris Lattner4f1a7b32007-08-26 16:34:22 +0000113 Value *EmitScalarConversion(Value *Src, QualType SrcTy, QualType DstTy);
114
115 /// EmitComplexToScalarConversion - Emit a conversion from the specified
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000116 /// complex type to the specified destination type, where the destination type
117 /// is an LLVM scalar type.
Chris Lattner4f1a7b32007-08-26 16:34:22 +0000118 Value *EmitComplexToScalarConversion(CodeGenFunction::ComplexPairTy Src,
119 QualType SrcTy, QualType DstTy);
Mike Stumpdf6b68c2009-02-12 18:29:15 +0000120
Anders Carlssona40a9f32010-05-22 17:45:10 +0000121 /// EmitNullValue - Emit a value that corresponds to null for the given type.
122 Value *EmitNullValue(QualType Ty);
123
John McCalldaa8e4e2010-11-15 09:13:47 +0000124 /// EmitFloatToBoolConversion - Perform an FP to boolean conversion.
125 Value *EmitFloatToBoolConversion(Value *V) {
126 // Compare against 0.0 for fp scalars.
127 llvm::Value *Zero = llvm::Constant::getNullValue(V->getType());
128 return Builder.CreateFCmpUNE(V, Zero, "tobool");
129 }
130
131 /// EmitPointerToBoolConversion - Perform a pointer to boolean conversion.
132 Value *EmitPointerToBoolConversion(Value *V) {
133 Value *Zero = llvm::ConstantPointerNull::get(
134 cast<llvm::PointerType>(V->getType()));
135 return Builder.CreateICmpNE(V, Zero, "tobool");
136 }
137
138 Value *EmitIntToBoolConversion(Value *V) {
139 // Because of the type rules of C, we often end up computing a
140 // logical value, then zero extending it to int, then wanting it
141 // as a logical value again. Optimize this common case.
142 if (llvm::ZExtInst *ZI = dyn_cast<llvm::ZExtInst>(V)) {
143 if (ZI->getOperand(0)->getType() == Builder.getInt1Ty()) {
144 Value *Result = ZI->getOperand(0);
145 // If there aren't any more uses, zap the instruction to save space.
146 // Note that there can be more uses, for example if this
147 // is the result of an assignment.
148 if (ZI->use_empty())
149 ZI->eraseFromParent();
150 return Result;
151 }
152 }
153
Chris Lattner48431f92011-04-19 22:55:03 +0000154 return Builder.CreateIsNotNull(V, "tobool");
John McCalldaa8e4e2010-11-15 09:13:47 +0000155 }
156
Chris Lattner7f02f722007-08-24 05:35:26 +0000157 //===--------------------------------------------------------------------===//
158 // Visitor Methods
159 //===--------------------------------------------------------------------===//
160
Fariborz Jahanianaf9b9682010-09-17 15:51:28 +0000161 Value *Visit(Expr *E) {
Fariborz Jahanianaf9b9682010-09-17 15:51:28 +0000162 return StmtVisitor<ScalarExprEmitter, Value*>::Visit(E);
163 }
164
Chris Lattner7f02f722007-08-24 05:35:26 +0000165 Value *VisitStmt(Stmt *S) {
Ted Kremenek7a9d49f2007-12-11 21:27:55 +0000166 S->dump(CGF.getContext().getSourceManager());
David Blaikieb219cfc2011-09-23 05:06:16 +0000167 llvm_unreachable("Stmt can't have complex result type!");
Chris Lattner7f02f722007-08-24 05:35:26 +0000168 }
169 Value *VisitExpr(Expr *S);
Fariborz Jahanianf51dc642009-10-21 23:45:42 +0000170
Fariborz Jahanianaf9b9682010-09-17 15:51:28 +0000171 Value *VisitParenExpr(ParenExpr *PE) {
172 return Visit(PE->getSubExpr());
173 }
John McCall91a57552011-07-15 05:09:51 +0000174 Value *VisitSubstNonTypeTemplateParmExpr(SubstNonTypeTemplateParmExpr *E) {
175 return Visit(E->getReplacement());
176 }
Peter Collingbournef111d932011-04-15 00:35:48 +0000177 Value *VisitGenericSelectionExpr(GenericSelectionExpr *GE) {
178 return Visit(GE->getResultExpr());
179 }
Chris Lattner7f02f722007-08-24 05:35:26 +0000180
181 // Leaves.
182 Value *VisitIntegerLiteral(const IntegerLiteral *E) {
Chris Lattner48431f92011-04-19 22:55:03 +0000183 return Builder.getInt(E->getValue());
Chris Lattner7f02f722007-08-24 05:35:26 +0000184 }
185 Value *VisitFloatingLiteral(const FloatingLiteral *E) {
Owen Andersonbc0a2222009-07-27 21:00:51 +0000186 return llvm::ConstantFP::get(VMContext, E->getValue());
Chris Lattner7f02f722007-08-24 05:35:26 +0000187 }
188 Value *VisitCharacterLiteral(const CharacterLiteral *E) {
Owen Anderson4a28d5d2009-07-24 23:12:58 +0000189 return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue());
Chris Lattner7f02f722007-08-24 05:35:26 +0000190 }
Ted Kremenekebcb57a2012-03-06 20:05:56 +0000191 Value *VisitObjCBoolLiteralExpr(const ObjCBoolLiteralExpr *E) {
192 return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue());
193 }
Nate Begemane7579b52007-11-15 05:40:03 +0000194 Value *VisitCXXBoolLiteralExpr(const CXXBoolLiteralExpr *E) {
Owen Anderson4a28d5d2009-07-24 23:12:58 +0000195 return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue());
Nate Begemane7579b52007-11-15 05:40:03 +0000196 }
Douglas Gregored8abf12010-07-08 06:14:04 +0000197 Value *VisitCXXScalarValueInitExpr(const CXXScalarValueInitExpr *E) {
Anders Carlssona40a9f32010-05-22 17:45:10 +0000198 return EmitNullValue(E->getType());
Argyrios Kyrtzidis7267f782008-08-23 19:35:47 +0000199 }
Anders Carlsson3f704562008-12-21 22:39:40 +0000200 Value *VisitGNUNullExpr(const GNUNullExpr *E) {
Anders Carlssona40a9f32010-05-22 17:45:10 +0000201 return EmitNullValue(E->getType());
Anders Carlsson3f704562008-12-21 22:39:40 +0000202 }
Eli Friedman0027d2b2010-08-05 09:58:49 +0000203 Value *VisitOffsetOfExpr(OffsetOfExpr *E);
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +0000204 Value *VisitUnaryExprOrTypeTraitExpr(const UnaryExprOrTypeTraitExpr *E);
Daniel Dunbar0ffb1252008-08-04 16:51:22 +0000205 Value *VisitAddrLabelExpr(const AddrLabelExpr *E) {
Chris Lattnerd9becd12009-10-28 23:59:40 +0000206 llvm::Value *V = CGF.GetAddrOfLabel(E->getLabel());
207 return Builder.CreateBitCast(V, ConvertType(E->getType()));
Daniel Dunbar0ffb1252008-08-04 16:51:22 +0000208 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000209
Douglas Gregor9370c8f2011-01-12 22:11:34 +0000210 Value *VisitSizeOfPackExpr(SizeOfPackExpr *E) {
Chris Lattner48431f92011-04-19 22:55:03 +0000211 return llvm::ConstantInt::get(ConvertType(E->getType()),E->getPackLength());
Douglas Gregor9370c8f2011-01-12 22:11:34 +0000212 }
John McCalle996ffd2011-02-16 08:02:54 +0000213
John McCall4b9c2d22011-11-06 09:01:30 +0000214 Value *VisitPseudoObjectExpr(PseudoObjectExpr *E) {
215 return CGF.EmitPseudoObjectRValue(E).getScalarVal();
216 }
217
John McCalle996ffd2011-02-16 08:02:54 +0000218 Value *VisitOpaqueValueExpr(OpaqueValueExpr *E) {
John McCall56ca35d2011-02-17 10:25:35 +0000219 if (E->isGLValue())
John McCall545d9962011-06-25 02:11:03 +0000220 return EmitLoadOfLValue(CGF.getOpaqueLValueMapping(E));
John McCalle996ffd2011-02-16 08:02:54 +0000221
222 // Otherwise, assume the mapping is the scalar directly.
John McCall56ca35d2011-02-17 10:25:35 +0000223 return CGF.getOpaqueRValueMapping(E).getScalarVal();
John McCalle996ffd2011-02-16 08:02:54 +0000224 }
John McCalldd2ecee2012-03-10 03:05:10 +0000225
Chris Lattner7f02f722007-08-24 05:35:26 +0000226 // l-values.
John McCallf4b88a42012-03-10 09:33:50 +0000227 Value *VisitDeclRefExpr(DeclRefExpr *E) {
228 if (CodeGenFunction::ConstantEmission result = CGF.tryEmitAsConstant(E)) {
John McCalldd2ecee2012-03-10 03:05:10 +0000229 if (result.isReference())
John McCallf4b88a42012-03-10 09:33:50 +0000230 return EmitLoadOfLValue(result.getReferenceLValue(CGF, E));
John McCalldd2ecee2012-03-10 03:05:10 +0000231 return result.getValue();
Richard Smitha3ca41f2012-03-02 23:27:11 +0000232 }
John McCallf4b88a42012-03-10 09:33:50 +0000233 return EmitLoadOfLValue(E);
John McCalldd2ecee2012-03-10 03:05:10 +0000234 }
235
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000236 Value *VisitObjCSelectorExpr(ObjCSelectorExpr *E) {
237 return CGF.EmitObjCSelectorExpr(E);
Daniel Dunbar9c3fc702008-08-27 06:57:25 +0000238 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000239 Value *VisitObjCProtocolExpr(ObjCProtocolExpr *E) {
240 return CGF.EmitObjCProtocolExpr(E);
Daniel Dunbar9c3fc702008-08-27 06:57:25 +0000241 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000242 Value *VisitObjCIvarRefExpr(ObjCIvarRefExpr *E) {
Daniel Dunbar9c3fc702008-08-27 06:57:25 +0000243 return EmitLoadOfLValue(E);
244 }
Daniel Dunbar9c3fc702008-08-27 06:57:25 +0000245 Value *VisitObjCMessageExpr(ObjCMessageExpr *E) {
Fariborz Jahanian180ff3a2011-03-02 20:09:49 +0000246 if (E->getMethodDecl() &&
247 E->getMethodDecl()->getResultType()->isReferenceType())
248 return EmitLoadOfLValue(E);
Daniel Dunbar9c3fc702008-08-27 06:57:25 +0000249 return CGF.EmitObjCMessageExpr(E).getScalarVal();
Daniel Dunbar0a04d772008-08-23 10:51:21 +0000250 }
251
Fariborz Jahanian83dc3252009-12-09 19:05:56 +0000252 Value *VisitObjCIsaExpr(ObjCIsaExpr *E) {
Fariborz Jahanian820bca42009-12-09 23:35:29 +0000253 LValue LV = CGF.EmitObjCIsaExpr(E);
John McCall545d9962011-06-25 02:11:03 +0000254 Value *V = CGF.EmitLoadOfLValue(LV).getScalarVal();
Fariborz Jahanian83dc3252009-12-09 19:05:56 +0000255 return V;
256 }
257
Chris Lattner7f02f722007-08-24 05:35:26 +0000258 Value *VisitArraySubscriptExpr(ArraySubscriptExpr *E);
Eli Friedmand38617c2008-05-14 19:38:39 +0000259 Value *VisitShuffleVectorExpr(ShuffleVectorExpr *E);
Eli Friedman28665272009-11-26 03:22:21 +0000260 Value *VisitMemberExpr(MemberExpr *E);
Nate Begeman213541a2008-04-18 23:10:10 +0000261 Value *VisitExtVectorElementExpr(Expr *E) { return EmitLoadOfLValue(E); }
Chris Lattnerbe20bb52008-10-26 23:53:12 +0000262 Value *VisitCompoundLiteralExpr(CompoundLiteralExpr *E) {
263 return EmitLoadOfLValue(E);
264 }
Devang Patel35634f52007-10-24 17:18:43 +0000265
Nate Begeman0533b302009-10-18 20:10:40 +0000266 Value *VisitInitListExpr(InitListExpr *E);
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000267
Douglas Gregor3498bdb2009-01-29 17:44:32 +0000268 Value *VisitImplicitValueInitExpr(const ImplicitValueInitExpr *E) {
Richard Smith0dbe2fb2012-12-21 03:17:28 +0000269 return EmitNullValue(E->getType());
Douglas Gregor3498bdb2009-01-29 17:44:32 +0000270 }
John McCallbc8d40d2011-06-24 21:55:10 +0000271 Value *VisitExplicitCastExpr(ExplicitCastExpr *E) {
Fariborz Jahanian745da3a2010-09-24 17:30:16 +0000272 if (E->getType()->isVariablyModifiedType())
John McCallbc8d40d2011-06-24 21:55:10 +0000273 CGF.EmitVariablyModifiedType(E->getType());
274 return VisitCastExpr(E);
Chris Lattner7f02f722007-08-24 05:35:26 +0000275 }
John McCallbc8d40d2011-06-24 21:55:10 +0000276 Value *VisitCastExpr(CastExpr *E);
Chris Lattner7f02f722007-08-24 05:35:26 +0000277
278 Value *VisitCallExpr(const CallExpr *E) {
Anders Carlssone9f2f452009-05-27 03:37:57 +0000279 if (E->getCallReturnType()->isReferenceType())
280 return EmitLoadOfLValue(E);
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000281
Chris Lattner9b655512007-08-31 22:49:20 +0000282 return CGF.EmitCallExpr(E).getScalarVal();
Chris Lattner7f02f722007-08-24 05:35:26 +0000283 }
Daniel Dunbar8f2926b2008-08-23 03:46:30 +0000284
Chris Lattner33793202007-08-31 22:09:40 +0000285 Value *VisitStmtExpr(const StmtExpr *E);
Mike Stump4e7a1f72009-02-21 20:00:35 +0000286
Chris Lattner7f02f722007-08-24 05:35:26 +0000287 // Unary Operators.
Chris Lattner7f02f722007-08-24 05:35:26 +0000288 Value *VisitUnaryPostDec(const UnaryOperator *E) {
Chris Lattner8c11a652010-06-26 22:09:34 +0000289 LValue LV = EmitLValue(E->getSubExpr());
290 return EmitScalarPrePostIncDec(E, LV, false, false);
Chris Lattner7f02f722007-08-24 05:35:26 +0000291 }
292 Value *VisitUnaryPostInc(const UnaryOperator *E) {
Chris Lattner8c11a652010-06-26 22:09:34 +0000293 LValue LV = EmitLValue(E->getSubExpr());
294 return EmitScalarPrePostIncDec(E, LV, true, false);
Chris Lattner7f02f722007-08-24 05:35:26 +0000295 }
296 Value *VisitUnaryPreDec(const UnaryOperator *E) {
Chris Lattner8c11a652010-06-26 22:09:34 +0000297 LValue LV = EmitLValue(E->getSubExpr());
298 return EmitScalarPrePostIncDec(E, LV, false, true);
Chris Lattner7f02f722007-08-24 05:35:26 +0000299 }
300 Value *VisitUnaryPreInc(const UnaryOperator *E) {
Chris Lattner8c11a652010-06-26 22:09:34 +0000301 LValue LV = EmitLValue(E->getSubExpr());
302 return EmitScalarPrePostIncDec(E, LV, true, true);
Chris Lattner7f02f722007-08-24 05:35:26 +0000303 }
Chris Lattner8c11a652010-06-26 22:09:34 +0000304
Anton Yartsev683564a2011-02-07 02:17:30 +0000305 llvm::Value *EmitAddConsiderOverflowBehavior(const UnaryOperator *E,
306 llvm::Value *InVal,
307 llvm::Value *NextVal,
308 bool IsInc);
309
Chris Lattner8c11a652010-06-26 22:09:34 +0000310 llvm::Value *EmitScalarPrePostIncDec(const UnaryOperator *E, LValue LV,
311 bool isInc, bool isPre);
312
313
Chris Lattner7f02f722007-08-24 05:35:26 +0000314 Value *VisitUnaryAddrOf(const UnaryOperator *E) {
John McCall5808ce42011-02-03 08:15:49 +0000315 if (isa<MemberPointerType>(E->getType())) // never sugared
316 return CGF.CGM.getMemberPointerConstant(E);
317
Chris Lattner7f02f722007-08-24 05:35:26 +0000318 return EmitLValue(E->getSubExpr()).getAddress();
319 }
John McCallfd569002010-12-04 12:43:24 +0000320 Value *VisitUnaryDeref(const UnaryOperator *E) {
321 if (E->getType()->isVoidType())
322 return Visit(E->getSubExpr()); // the actual value should be unused
323 return EmitLoadOfLValue(E);
324 }
Chris Lattner7f02f722007-08-24 05:35:26 +0000325 Value *VisitUnaryPlus(const UnaryOperator *E) {
Mike Stump7f79f9b2009-05-29 15:46:01 +0000326 // This differs from gcc, though, most likely due to a bug in gcc.
327 TestAndClearIgnoreResultAssign();
Chris Lattner7f02f722007-08-24 05:35:26 +0000328 return Visit(E->getSubExpr());
329 }
330 Value *VisitUnaryMinus (const UnaryOperator *E);
331 Value *VisitUnaryNot (const UnaryOperator *E);
332 Value *VisitUnaryLNot (const UnaryOperator *E);
Chris Lattner46f93d02007-08-24 21:20:17 +0000333 Value *VisitUnaryReal (const UnaryOperator *E);
334 Value *VisitUnaryImag (const UnaryOperator *E);
Chris Lattner7f02f722007-08-24 05:35:26 +0000335 Value *VisitUnaryExtension(const UnaryOperator *E) {
336 return Visit(E->getSubExpr());
337 }
Douglas Gregor8ecdb652010-04-28 22:16:22 +0000338
Anders Carlsson5f4307b2009-04-14 16:58:56 +0000339 // C++
Douglas Gregor3f86ce12011-08-09 00:37:14 +0000340 Value *VisitMaterializeTemporaryExpr(const MaterializeTemporaryExpr *E) {
Eli Friedmanec24b0e2011-08-14 04:50:34 +0000341 return EmitLoadOfLValue(E);
Douglas Gregor3f86ce12011-08-09 00:37:14 +0000342 }
343
Chris Lattner04421082008-04-08 04:40:51 +0000344 Value *VisitCXXDefaultArgExpr(CXXDefaultArgExpr *DAE) {
345 return Visit(DAE->getExpr());
346 }
Anders Carlsson5f4307b2009-04-14 16:58:56 +0000347 Value *VisitCXXThisExpr(CXXThisExpr *TE) {
348 return CGF.LoadCXXThis();
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000349 }
350
John McCall4765fa02010-12-06 08:20:24 +0000351 Value *VisitExprWithCleanups(ExprWithCleanups *E) {
John McCall1a343eb2011-11-10 08:15:53 +0000352 CGF.enterFullExpression(E);
353 CodeGenFunction::RunCleanupsScope Scope(CGF);
354 return Visit(E->getSubExpr());
Anders Carlsson7f6ad152009-05-19 04:48:36 +0000355 }
Anders Carlssona00703d2009-05-31 01:40:14 +0000356 Value *VisitCXXNewExpr(const CXXNewExpr *E) {
357 return CGF.EmitCXXNewExpr(E);
358 }
Anders Carlsson60e282c2009-08-16 21:13:42 +0000359 Value *VisitCXXDeleteExpr(const CXXDeleteExpr *E) {
360 CGF.EmitCXXDeleteExpr(E);
361 return 0;
362 }
Eli Friedman9dfebdc2009-12-10 22:40:32 +0000363 Value *VisitUnaryTypeTraitExpr(const UnaryTypeTraitExpr *E) {
Chris Lattner48431f92011-04-19 22:55:03 +0000364 return Builder.getInt1(E->getValue());
Eli Friedman9dfebdc2009-12-10 22:40:32 +0000365 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000366
Francois Pichet6ad6f282010-12-07 00:08:36 +0000367 Value *VisitBinaryTypeTraitExpr(const BinaryTypeTraitExpr *E) {
Francois Pichetf1872372010-12-08 22:35:30 +0000368 return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue());
Francois Pichet6ad6f282010-12-07 00:08:36 +0000369 }
370
John Wiegley21ff2e52011-04-28 00:16:57 +0000371 Value *VisitArrayTypeTraitExpr(const ArrayTypeTraitExpr *E) {
372 return llvm::ConstantInt::get(Builder.getInt32Ty(), E->getValue());
373 }
374
John Wiegley55262202011-04-25 06:54:41 +0000375 Value *VisitExpressionTraitExpr(const ExpressionTraitExpr *E) {
376 return llvm::ConstantInt::get(Builder.getInt1Ty(), E->getValue());
377 }
378
Douglas Gregora71d8192009-09-04 17:36:40 +0000379 Value *VisitCXXPseudoDestructorExpr(const CXXPseudoDestructorExpr *E) {
380 // C++ [expr.pseudo]p1:
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000381 // The result shall only be used as the operand for the function call
Douglas Gregora71d8192009-09-04 17:36:40 +0000382 // operator (), and the result of such a call has type void. The only
383 // effect is the evaluation of the postfix-expression before the dot or
384 // arrow.
385 CGF.EmitScalarExpr(E->getBase());
386 return 0;
387 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000388
Anders Carlssonc1eb14a2009-09-15 04:39:46 +0000389 Value *VisitCXXNullPtrLiteralExpr(const CXXNullPtrLiteralExpr *E) {
Anders Carlssona40a9f32010-05-22 17:45:10 +0000390 return EmitNullValue(E->getType());
Anders Carlssonc1eb14a2009-09-15 04:39:46 +0000391 }
Anders Carlsson756b5c42009-10-30 01:42:31 +0000392
393 Value *VisitCXXThrowExpr(const CXXThrowExpr *E) {
394 CGF.EmitCXXThrowExpr(E);
395 return 0;
396 }
397
Sebastian Redl98294de2010-09-10 21:04:00 +0000398 Value *VisitCXXNoexceptExpr(const CXXNoexceptExpr *E) {
Chris Lattner48431f92011-04-19 22:55:03 +0000399 return Builder.getInt1(E->getValue());
Sebastian Redl98294de2010-09-10 21:04:00 +0000400 }
401
Chris Lattner7f02f722007-08-24 05:35:26 +0000402 // Binary Operators.
Chris Lattner7f02f722007-08-24 05:35:26 +0000403 Value *EmitMul(const BinOpInfo &Ops) {
Douglas Gregor575a1c92011-05-20 16:38:50 +0000404 if (Ops.Ty->isSignedIntegerOrEnumerationType()) {
Richard Smith7edf9e32012-11-01 22:30:59 +0000405 switch (CGF.getLangOpts().getSignedOverflowBehavior()) {
Chris Lattnera4d71452010-06-26 21:25:03 +0000406 case LangOptions::SOB_Defined:
407 return Builder.CreateMul(Ops.LHS, Ops.RHS, "mul");
Richard Smith9d3e2262012-08-25 00:32:28 +0000408 case LangOptions::SOB_Undefined:
Will Dietz4f45bc02013-01-18 11:30:38 +0000409 if (!CGF.SanOpts->SignedIntegerOverflow)
Richard Smith9d3e2262012-08-25 00:32:28 +0000410 return Builder.CreateNSWMul(Ops.LHS, Ops.RHS, "mul");
411 // Fall through.
Chris Lattnera4d71452010-06-26 21:25:03 +0000412 case LangOptions::SOB_Trapping:
413 return EmitOverflowCheckedBinOp(Ops);
414 }
415 }
Richard Smithd6396a62012-11-05 22:21:05 +0000416
Will Dietz4f45bc02013-01-18 11:30:38 +0000417 if (Ops.Ty->isUnsignedIntegerType() && CGF.SanOpts->UnsignedIntegerOverflow)
Will Dietzb8540362012-11-27 15:01:55 +0000418 return EmitOverflowCheckedBinOp(Ops);
419
Duncan Sandsf177d9d2010-02-15 16:14:01 +0000420 if (Ops.LHS->getType()->isFPOrFPVectorTy())
Chris Lattner87415d22009-06-17 06:36:24 +0000421 return Builder.CreateFMul(Ops.LHS, Ops.RHS, "mul");
Chris Lattner7f02f722007-08-24 05:35:26 +0000422 return Builder.CreateMul(Ops.LHS, Ops.RHS, "mul");
423 }
Mike Stump2add4732009-04-01 20:28:16 +0000424 /// Create a binary op that checks for overflow.
425 /// Currently only supports +, - and *.
426 Value *EmitOverflowCheckedBinOp(const BinOpInfo &Ops);
Richard Smith7ac9ef12012-09-08 02:08:36 +0000427
Chris Lattner80230302010-09-11 21:47:09 +0000428 // Check for undefined division and modulus behaviors.
429 void EmitUndefinedBehaviorIntegerDivAndRemCheck(const BinOpInfo &Ops,
430 llvm::Value *Zero,bool isDiv);
David Tweed7a834212013-01-07 16:43:27 +0000431 // Common helper for getting how wide LHS of shift is.
432 static Value *GetWidthMinusOneValue(Value* LHS,Value* RHS);
Chris Lattner7f02f722007-08-24 05:35:26 +0000433 Value *EmitDiv(const BinOpInfo &Ops);
434 Value *EmitRem(const BinOpInfo &Ops);
435 Value *EmitAdd(const BinOpInfo &Ops);
436 Value *EmitSub(const BinOpInfo &Ops);
437 Value *EmitShl(const BinOpInfo &Ops);
438 Value *EmitShr(const BinOpInfo &Ops);
439 Value *EmitAnd(const BinOpInfo &Ops) {
440 return Builder.CreateAnd(Ops.LHS, Ops.RHS, "and");
441 }
442 Value *EmitXor(const BinOpInfo &Ops) {
443 return Builder.CreateXor(Ops.LHS, Ops.RHS, "xor");
444 }
445 Value *EmitOr (const BinOpInfo &Ops) {
446 return Builder.CreateOr(Ops.LHS, Ops.RHS, "or");
447 }
448
Chris Lattner1f1ded92007-08-24 21:00:35 +0000449 BinOpInfo EmitBinOps(const BinaryOperator *E);
Douglas Gregor6a03e342010-04-23 04:16:32 +0000450 LValue EmitCompoundAssignLValue(const CompoundAssignOperator *E,
451 Value *(ScalarExprEmitter::*F)(const BinOpInfo &),
Daniel Dunbard7f7d082010-06-29 22:00:45 +0000452 Value *&Result);
Douglas Gregor6a03e342010-04-23 04:16:32 +0000453
Chris Lattner3ccf7742007-08-26 21:41:21 +0000454 Value *EmitCompoundAssign(const CompoundAssignOperator *E,
Chris Lattner1f1ded92007-08-24 21:00:35 +0000455 Value *(ScalarExprEmitter::*F)(const BinOpInfo &));
456
457 // Binary operators and binary compound assignment operators.
458#define HANDLEBINOP(OP) \
Chris Lattner3ccf7742007-08-26 21:41:21 +0000459 Value *VisitBin ## OP(const BinaryOperator *E) { \
460 return Emit ## OP(EmitBinOps(E)); \
461 } \
462 Value *VisitBin ## OP ## Assign(const CompoundAssignOperator *E) { \
463 return EmitCompoundAssign(E, &ScalarExprEmitter::Emit ## OP); \
Chris Lattner1f1ded92007-08-24 21:00:35 +0000464 }
Daniel Dunbar7177dee2009-12-19 17:50:07 +0000465 HANDLEBINOP(Mul)
466 HANDLEBINOP(Div)
467 HANDLEBINOP(Rem)
468 HANDLEBINOP(Add)
469 HANDLEBINOP(Sub)
470 HANDLEBINOP(Shl)
471 HANDLEBINOP(Shr)
472 HANDLEBINOP(And)
473 HANDLEBINOP(Xor)
474 HANDLEBINOP(Or)
Chris Lattner1f1ded92007-08-24 21:00:35 +0000475#undef HANDLEBINOP
Daniel Dunbar8c6f57c2008-08-06 02:00:38 +0000476
Chris Lattner7f02f722007-08-24 05:35:26 +0000477 // Comparisons.
478 Value *EmitCompare(const BinaryOperator *E, unsigned UICmpOpc,
479 unsigned SICmpOpc, unsigned FCmpOpc);
480#define VISITCOMP(CODE, UI, SI, FP) \
481 Value *VisitBin##CODE(const BinaryOperator *E) { \
482 return EmitCompare(E, llvm::ICmpInst::UI, llvm::ICmpInst::SI, \
483 llvm::FCmpInst::FP); }
Daniel Dunbar7177dee2009-12-19 17:50:07 +0000484 VISITCOMP(LT, ICMP_ULT, ICMP_SLT, FCMP_OLT)
485 VISITCOMP(GT, ICMP_UGT, ICMP_SGT, FCMP_OGT)
486 VISITCOMP(LE, ICMP_ULE, ICMP_SLE, FCMP_OLE)
487 VISITCOMP(GE, ICMP_UGE, ICMP_SGE, FCMP_OGE)
488 VISITCOMP(EQ, ICMP_EQ , ICMP_EQ , FCMP_OEQ)
489 VISITCOMP(NE, ICMP_NE , ICMP_NE , FCMP_UNE)
Chris Lattner7f02f722007-08-24 05:35:26 +0000490#undef VISITCOMP
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000491
Chris Lattner7f02f722007-08-24 05:35:26 +0000492 Value *VisitBinAssign (const BinaryOperator *E);
493
494 Value *VisitBinLAnd (const BinaryOperator *E);
495 Value *VisitBinLOr (const BinaryOperator *E);
Chris Lattner7f02f722007-08-24 05:35:26 +0000496 Value *VisitBinComma (const BinaryOperator *E);
497
Eli Friedman25b825d2009-11-18 09:41:26 +0000498 Value *VisitBinPtrMemD(const Expr *E) { return EmitLoadOfLValue(E); }
499 Value *VisitBinPtrMemI(const Expr *E) { return EmitLoadOfLValue(E); }
500
Chris Lattner7f02f722007-08-24 05:35:26 +0000501 // Other Operators.
Mike Stumpdf6b68c2009-02-12 18:29:15 +0000502 Value *VisitBlockExpr(const BlockExpr *BE);
John McCall56ca35d2011-02-17 10:25:35 +0000503 Value *VisitAbstractConditionalOperator(const AbstractConditionalOperator *);
Chris Lattner7f02f722007-08-24 05:35:26 +0000504 Value *VisitChooseExpr(ChooseExpr *CE);
Anders Carlsson7c50aca2007-10-15 20:28:48 +0000505 Value *VisitVAArgExpr(VAArgExpr *VE);
Chris Lattner7f02f722007-08-24 05:35:26 +0000506 Value *VisitObjCStringLiteral(const ObjCStringLiteral *E) {
507 return CGF.EmitObjCStringLiteral(E);
508 }
Patrick Beardeb382ec2012-04-19 00:25:12 +0000509 Value *VisitObjCBoxedExpr(ObjCBoxedExpr *E) {
510 return CGF.EmitObjCBoxedExpr(E);
Ted Kremenekebcb57a2012-03-06 20:05:56 +0000511 }
512 Value *VisitObjCArrayLiteral(ObjCArrayLiteral *E) {
513 return CGF.EmitObjCArrayLiteral(E);
514 }
515 Value *VisitObjCDictionaryLiteral(ObjCDictionaryLiteral *E) {
516 return CGF.EmitObjCDictionaryLiteral(E);
517 }
Tanya Lattner61eee0c2011-06-04 00:47:47 +0000518 Value *VisitAsTypeExpr(AsTypeExpr *CE);
Eli Friedman276b0612011-10-11 02:20:01 +0000519 Value *VisitAtomicExpr(AtomicExpr *AE);
Chris Lattner7f02f722007-08-24 05:35:26 +0000520};
521} // end anonymous namespace.
522
523//===----------------------------------------------------------------------===//
524// Utilities
525//===----------------------------------------------------------------------===//
526
Chris Lattner9abc84e2007-08-26 16:42:57 +0000527/// EmitConversionToBool - Convert the specified expression value to a
Chris Lattner3420d0d2007-08-26 17:25:57 +0000528/// boolean (i1) truth value. This is equivalent to "Val != 0".
Chris Lattner9abc84e2007-08-26 16:42:57 +0000529Value *ScalarExprEmitter::EmitConversionToBool(Value *Src, QualType SrcType) {
John McCall467b27b2009-10-22 20:10:53 +0000530 assert(SrcType.isCanonical() && "EmitScalarConversion strips typedefs");
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000531
John McCalldaa8e4e2010-11-15 09:13:47 +0000532 if (SrcType->isRealFloatingType())
533 return EmitFloatToBoolConversion(Src);
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000534
John McCall0bab0cd2010-08-23 01:21:21 +0000535 if (const MemberPointerType *MPT = dyn_cast<MemberPointerType>(SrcType))
536 return CGF.CGM.getCXXABI().EmitMemberPointerIsNotNull(CGF, Src, MPT);
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000537
Daniel Dunbard1d66bc2008-08-25 10:38:11 +0000538 assert((SrcType->isIntegerType() || isa<llvm::PointerType>(Src->getType())) &&
Chris Lattner9abc84e2007-08-26 16:42:57 +0000539 "Unknown scalar type to convert");
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000540
John McCalldaa8e4e2010-11-15 09:13:47 +0000541 if (isa<llvm::IntegerType>(Src->getType()))
542 return EmitIntToBoolConversion(Src);
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000543
John McCalldaa8e4e2010-11-15 09:13:47 +0000544 assert(isa<llvm::PointerType>(Src->getType()));
545 return EmitPointerToBoolConversion(Src);
Chris Lattner9abc84e2007-08-26 16:42:57 +0000546}
547
Richard Smithb2aa66c2012-10-12 22:57:06 +0000548void ScalarExprEmitter::EmitFloatConversionCheck(Value *OrigSrc,
549 QualType OrigSrcType,
550 Value *Src, QualType SrcType,
551 QualType DstType,
552 llvm::Type *DstTy) {
553 using llvm::APFloat;
554 using llvm::APSInt;
555
556 llvm::Type *SrcTy = Src->getType();
557
558 llvm::Value *Check = 0;
559 if (llvm::IntegerType *IntTy = dyn_cast<llvm::IntegerType>(SrcTy)) {
560 // Integer to floating-point. This can fail for unsigned short -> __half
561 // or unsigned __int128 -> float.
562 assert(DstType->isFloatingType());
563 bool SrcIsUnsigned = OrigSrcType->isUnsignedIntegerOrEnumerationType();
564
565 APFloat LargestFloat =
566 APFloat::getLargest(CGF.getContext().getFloatTypeSemantics(DstType));
567 APSInt LargestInt(IntTy->getBitWidth(), SrcIsUnsigned);
568
569 bool IsExact;
570 if (LargestFloat.convertToInteger(LargestInt, APFloat::rmTowardZero,
571 &IsExact) != APFloat::opOK)
572 // The range of representable values of this floating point type includes
573 // all values of this integer type. Don't need an overflow check.
574 return;
575
576 llvm::Value *Max = llvm::ConstantInt::get(VMContext, LargestInt);
577 if (SrcIsUnsigned)
578 Check = Builder.CreateICmpULE(Src, Max);
579 else {
580 llvm::Value *Min = llvm::ConstantInt::get(VMContext, -LargestInt);
581 llvm::Value *GE = Builder.CreateICmpSGE(Src, Min);
582 llvm::Value *LE = Builder.CreateICmpSLE(Src, Max);
583 Check = Builder.CreateAnd(GE, LE);
584 }
585 } else {
586 // Floating-point to integer or floating-point to floating-point. This has
587 // undefined behavior if the source is +-Inf, NaN, or doesn't fit into the
588 // destination type.
589 const llvm::fltSemantics &SrcSema =
590 CGF.getContext().getFloatTypeSemantics(OrigSrcType);
591 APFloat MaxSrc(SrcSema, APFloat::uninitialized);
592 APFloat MinSrc(SrcSema, APFloat::uninitialized);
593
594 if (isa<llvm::IntegerType>(DstTy)) {
595 unsigned Width = CGF.getContext().getIntWidth(DstType);
596 bool Unsigned = DstType->isUnsignedIntegerOrEnumerationType();
597
598 APSInt Min = APSInt::getMinValue(Width, Unsigned);
599 if (MinSrc.convertFromAPInt(Min, !Unsigned, APFloat::rmTowardZero) &
600 APFloat::opOverflow)
601 // Don't need an overflow check for lower bound. Just check for
602 // -Inf/NaN.
603 MinSrc = APFloat::getLargest(SrcSema, true);
604
605 APSInt Max = APSInt::getMaxValue(Width, Unsigned);
606 if (MaxSrc.convertFromAPInt(Max, !Unsigned, APFloat::rmTowardZero) &
607 APFloat::opOverflow)
608 // Don't need an overflow check for upper bound. Just check for
609 // +Inf/NaN.
610 MaxSrc = APFloat::getLargest(SrcSema, false);
611 } else {
612 const llvm::fltSemantics &DstSema =
613 CGF.getContext().getFloatTypeSemantics(DstType);
614 bool IsInexact;
615
616 MinSrc = APFloat::getLargest(DstSema, true);
617 if (MinSrc.convert(SrcSema, APFloat::rmTowardZero, &IsInexact) &
618 APFloat::opOverflow)
619 MinSrc = APFloat::getLargest(SrcSema, true);
620
621 MaxSrc = APFloat::getLargest(DstSema, false);
622 if (MaxSrc.convert(SrcSema, APFloat::rmTowardZero, &IsInexact) &
623 APFloat::opOverflow)
624 MaxSrc = APFloat::getLargest(SrcSema, false);
625 }
626
627 // If we're converting from __half, convert the range to float to match
628 // the type of src.
629 if (OrigSrcType->isHalfType()) {
630 const llvm::fltSemantics &Sema =
631 CGF.getContext().getFloatTypeSemantics(SrcType);
632 bool IsInexact;
633 MinSrc.convert(Sema, APFloat::rmTowardZero, &IsInexact);
634 MaxSrc.convert(Sema, APFloat::rmTowardZero, &IsInexact);
635 }
636
637 llvm::Value *GE =
638 Builder.CreateFCmpOGE(Src, llvm::ConstantFP::get(VMContext, MinSrc));
639 llvm::Value *LE =
640 Builder.CreateFCmpOLE(Src, llvm::ConstantFP::get(VMContext, MaxSrc));
641 Check = Builder.CreateAnd(GE, LE);
642 }
643
644 // FIXME: Provide a SourceLocation.
645 llvm::Constant *StaticArgs[] = {
646 CGF.EmitCheckTypeDescriptor(OrigSrcType),
647 CGF.EmitCheckTypeDescriptor(DstType)
648 };
Will Dietzad954812012-12-02 19:50:33 +0000649 CGF.EmitCheck(Check, "float_cast_overflow", StaticArgs, OrigSrc,
650 CodeGenFunction::CRK_Recoverable);
Richard Smithb2aa66c2012-10-12 22:57:06 +0000651}
652
Chris Lattner3707b252007-08-26 06:48:56 +0000653/// EmitScalarConversion - Emit a conversion from the specified type to the
654/// specified destination type, both of which are LLVM scalar types.
Chris Lattner4f1a7b32007-08-26 16:34:22 +0000655Value *ScalarExprEmitter::EmitScalarConversion(Value *Src, QualType SrcType,
656 QualType DstType) {
Chris Lattner96196622008-07-26 22:37:01 +0000657 SrcType = CGF.getContext().getCanonicalType(SrcType);
658 DstType = CGF.getContext().getCanonicalType(DstType);
Chris Lattner3707b252007-08-26 06:48:56 +0000659 if (SrcType == DstType) return Src;
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000660
Chris Lattnercf289082007-08-26 07:21:11 +0000661 if (DstType->isVoidType()) return 0;
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000662
Richard Smithb2aa66c2012-10-12 22:57:06 +0000663 llvm::Value *OrigSrc = Src;
664 QualType OrigSrcType = SrcType;
Anton Korobeynikovaa4a99b2011-10-14 23:23:15 +0000665 llvm::Type *SrcTy = Src->getType();
666
Joey Gouly19dbb202013-01-23 11:56:20 +0000667 // If casting to/from storage-only half FP, use special intrinsics.
668 if (SrcType->isHalfType() && !CGF.getContext().getLangOpts().NativeHalfType) {
Anton Korobeynikovaa4a99b2011-10-14 23:23:15 +0000669 Src = Builder.CreateCall(CGF.CGM.getIntrinsic(llvm::Intrinsic::convert_from_fp16), Src);
670 SrcType = CGF.getContext().FloatTy;
Chris Lattner8b418682012-02-07 00:39:47 +0000671 SrcTy = CGF.FloatTy;
Anton Korobeynikovaa4a99b2011-10-14 23:23:15 +0000672 }
673
Chris Lattner3707b252007-08-26 06:48:56 +0000674 // Handle conversions to bool first, they are special: comparisons against 0.
Chris Lattnered70f0a2007-08-26 16:52:28 +0000675 if (DstType->isBooleanType())
676 return EmitConversionToBool(Src, SrcType);
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000677
Chris Lattner2acc6e32011-07-18 04:24:23 +0000678 llvm::Type *DstTy = ConvertType(DstType);
Chris Lattner3707b252007-08-26 06:48:56 +0000679
680 // Ignore conversions like int -> uint.
Anton Korobeynikovaa4a99b2011-10-14 23:23:15 +0000681 if (SrcTy == DstTy)
Chris Lattner3707b252007-08-26 06:48:56 +0000682 return Src;
683
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000684 // Handle pointer conversions next: pointers can only be converted to/from
685 // other pointers and integers. Check for pointer types in terms of LLVM, as
686 // some native types (like Obj-C id) may map to a pointer type.
Daniel Dunbar270cc662008-08-25 09:51:32 +0000687 if (isa<llvm::PointerType>(DstTy)) {
Chris Lattner3707b252007-08-26 06:48:56 +0000688 // The source value may be an integer, or a pointer.
Anton Korobeynikovaa4a99b2011-10-14 23:23:15 +0000689 if (isa<llvm::PointerType>(SrcTy))
Chris Lattner3707b252007-08-26 06:48:56 +0000690 return Builder.CreateBitCast(Src, DstTy, "conv");
Anders Carlsson191dfe92009-09-12 04:57:16 +0000691
Chris Lattner3707b252007-08-26 06:48:56 +0000692 assert(SrcType->isIntegerType() && "Not ptr->ptr or int->ptr conversion?");
Eli Friedman25615422009-03-04 04:02:35 +0000693 // First, convert to the correct width so that we control the kind of
694 // extension.
Chris Lattner2acc6e32011-07-18 04:24:23 +0000695 llvm::Type *MiddleTy = CGF.IntPtrTy;
Douglas Gregor575a1c92011-05-20 16:38:50 +0000696 bool InputSigned = SrcType->isSignedIntegerOrEnumerationType();
Eli Friedman25615422009-03-04 04:02:35 +0000697 llvm::Value* IntResult =
698 Builder.CreateIntCast(Src, MiddleTy, InputSigned, "conv");
699 // Then, cast to pointer.
700 return Builder.CreateIntToPtr(IntResult, DstTy, "conv");
Chris Lattner3707b252007-08-26 06:48:56 +0000701 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000702
Anton Korobeynikovaa4a99b2011-10-14 23:23:15 +0000703 if (isa<llvm::PointerType>(SrcTy)) {
Chris Lattner3707b252007-08-26 06:48:56 +0000704 // Must be an ptr to int cast.
705 assert(isa<llvm::IntegerType>(DstTy) && "not ptr->int?");
Anders Carlsson50b5a302007-10-31 23:18:02 +0000706 return Builder.CreatePtrToInt(Src, DstTy, "conv");
Chris Lattner3707b252007-08-26 06:48:56 +0000707 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000708
Nate Begeman213541a2008-04-18 23:10:10 +0000709 // A scalar can be splatted to an extended vector of the same element type
Nate Begeman2ef13e52009-08-10 23:49:36 +0000710 if (DstType->isExtVectorType() && !SrcType->isVectorType()) {
Nate Begeman6fe7c8a2009-01-18 06:42:49 +0000711 // Cast the scalar to element type
John McCall183700f2009-09-21 23:43:11 +0000712 QualType EltTy = DstType->getAs<ExtVectorType>()->getElementType();
Nate Begeman6fe7c8a2009-01-18 06:42:49 +0000713 llvm::Value *Elt = EmitScalarConversion(Src, SrcType, EltTy);
714
Nate Begeman6fe7c8a2009-01-18 06:42:49 +0000715 // Splat the element across to all elements
Nate Begeman6fe7c8a2009-01-18 06:42:49 +0000716 unsigned NumElements = cast<llvm::VectorType>(DstTy)->getNumElements();
Benjamin Kramer0b227082013-01-01 20:08:10 +0000717 return Builder.CreateVectorSplat(NumElements, Elt, "splat");
Nate Begeman6fe7c8a2009-01-18 06:42:49 +0000718 }
Nate Begeman4119d1a2007-12-30 02:59:45 +0000719
Chris Lattner3b1ae002008-02-02 04:51:41 +0000720 // Allow bitcast from vector to integer/fp of the same size.
Anton Korobeynikovaa4a99b2011-10-14 23:23:15 +0000721 if (isa<llvm::VectorType>(SrcTy) ||
Chris Lattner3b1ae002008-02-02 04:51:41 +0000722 isa<llvm::VectorType>(DstTy))
Anders Carlsson7019a9e2007-12-05 07:36:10 +0000723 return Builder.CreateBitCast(Src, DstTy, "conv");
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000724
Chris Lattner3707b252007-08-26 06:48:56 +0000725 // Finally, we have the arithmetic types: real int/float.
Anton Korobeynikovaa4a99b2011-10-14 23:23:15 +0000726 Value *Res = NULL;
727 llvm::Type *ResTy = DstTy;
728
Richard Smithb2aa66c2012-10-12 22:57:06 +0000729 // An overflowing conversion has undefined behavior if either the source type
730 // or the destination type is a floating-point type.
Will Dietz4f45bc02013-01-18 11:30:38 +0000731 if (CGF.SanOpts->FloatCastOverflow &&
Richard Smithb2aa66c2012-10-12 22:57:06 +0000732 (OrigSrcType->isFloatingType() || DstType->isFloatingType()))
Will Dietz4f45bc02013-01-18 11:30:38 +0000733 EmitFloatConversionCheck(OrigSrc, OrigSrcType, Src, SrcType, DstType,
734 DstTy);
Richard Smithb2aa66c2012-10-12 22:57:06 +0000735
Anton Korobeynikovaa4a99b2011-10-14 23:23:15 +0000736 // Cast to half via float
Joey Gouly19dbb202013-01-23 11:56:20 +0000737 if (DstType->isHalfType() && !CGF.getContext().getLangOpts().NativeHalfType)
Chris Lattner8b418682012-02-07 00:39:47 +0000738 DstTy = CGF.FloatTy;
Anton Korobeynikovaa4a99b2011-10-14 23:23:15 +0000739
740 if (isa<llvm::IntegerType>(SrcTy)) {
Douglas Gregor575a1c92011-05-20 16:38:50 +0000741 bool InputSigned = SrcType->isSignedIntegerOrEnumerationType();
Anders Carlssonb5ce0972007-12-26 18:20:19 +0000742 if (isa<llvm::IntegerType>(DstTy))
Anton Korobeynikovaa4a99b2011-10-14 23:23:15 +0000743 Res = Builder.CreateIntCast(Src, DstTy, InputSigned, "conv");
Anders Carlssonb5ce0972007-12-26 18:20:19 +0000744 else if (InputSigned)
Anton Korobeynikovaa4a99b2011-10-14 23:23:15 +0000745 Res = Builder.CreateSIToFP(Src, DstTy, "conv");
Anders Carlssonb5ce0972007-12-26 18:20:19 +0000746 else
Anton Korobeynikovaa4a99b2011-10-14 23:23:15 +0000747 Res = Builder.CreateUIToFP(Src, DstTy, "conv");
748 } else if (isa<llvm::IntegerType>(DstTy)) {
749 assert(SrcTy->isFloatingPointTy() && "Unknown real conversion");
Douglas Gregor575a1c92011-05-20 16:38:50 +0000750 if (DstType->isSignedIntegerOrEnumerationType())
Anton Korobeynikovaa4a99b2011-10-14 23:23:15 +0000751 Res = Builder.CreateFPToSI(Src, DstTy, "conv");
Anders Carlssonb5ce0972007-12-26 18:20:19 +0000752 else
Anton Korobeynikovaa4a99b2011-10-14 23:23:15 +0000753 Res = Builder.CreateFPToUI(Src, DstTy, "conv");
754 } else {
755 assert(SrcTy->isFloatingPointTy() && DstTy->isFloatingPointTy() &&
756 "Unknown real conversion");
757 if (DstTy->getTypeID() < SrcTy->getTypeID())
758 Res = Builder.CreateFPTrunc(Src, DstTy, "conv");
759 else
760 Res = Builder.CreateFPExt(Src, DstTy, "conv");
Chris Lattner3707b252007-08-26 06:48:56 +0000761 }
762
Anton Korobeynikovaa4a99b2011-10-14 23:23:15 +0000763 if (DstTy != ResTy) {
764 assert(ResTy->isIntegerTy(16) && "Only half FP requires extra conversion");
765 Res = Builder.CreateCall(CGF.CGM.getIntrinsic(llvm::Intrinsic::convert_to_fp16), Res);
766 }
767
768 return Res;
Chris Lattner3707b252007-08-26 06:48:56 +0000769}
770
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000771/// EmitComplexToScalarConversion - Emit a conversion from the specified complex
772/// type to the specified destination type, where the destination type is an
773/// LLVM scalar type.
Chris Lattner4f1a7b32007-08-26 16:34:22 +0000774Value *ScalarExprEmitter::
775EmitComplexToScalarConversion(CodeGenFunction::ComplexPairTy Src,
776 QualType SrcTy, QualType DstTy) {
Chris Lattnered70f0a2007-08-26 16:52:28 +0000777 // Get the source element type.
John McCall9d232c82013-03-07 21:37:08 +0000778 SrcTy = SrcTy->castAs<ComplexType>()->getElementType();
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000779
Chris Lattnered70f0a2007-08-26 16:52:28 +0000780 // Handle conversions to bool first, they are special: comparisons against 0.
781 if (DstTy->isBooleanType()) {
782 // Complex != 0 -> (Real != 0) | (Imag != 0)
783 Src.first = EmitScalarConversion(Src.first, SrcTy, DstTy);
784 Src.second = EmitScalarConversion(Src.second, SrcTy, DstTy);
785 return Builder.CreateOr(Src.first, Src.second, "tobool");
786 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000787
Chris Lattner4f1a7b32007-08-26 16:34:22 +0000788 // C99 6.3.1.7p2: "When a value of complex type is converted to a real type,
789 // the imaginary part of the complex value is discarded and the value of the
790 // real part is converted according to the conversion rules for the
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000791 // corresponding real type.
Chris Lattner4f1a7b32007-08-26 16:34:22 +0000792 return EmitScalarConversion(Src.first, SrcTy, DstTy);
793}
794
Anders Carlssona40a9f32010-05-22 17:45:10 +0000795Value *ScalarExprEmitter::EmitNullValue(QualType Ty) {
Richard Smith0dbe2fb2012-12-21 03:17:28 +0000796 return CGF.EmitFromMemory(CGF.CGM.EmitNullConstant(Ty), Ty);
Anders Carlssona40a9f32010-05-22 17:45:10 +0000797}
Chris Lattner4f1a7b32007-08-26 16:34:22 +0000798
Richard Smith4def70d2012-10-09 19:52:38 +0000799/// \brief Emit a sanitization check for the given "binary" operation (which
800/// might actually be a unary increment which has been lowered to a binary
801/// operation). The check passes if \p Check, which is an \c i1, is \c true.
802void ScalarExprEmitter::EmitBinOpCheck(Value *Check, const BinOpInfo &Info) {
803 StringRef CheckName;
Dmitri Gribenkocfa88f82013-01-12 19:30:44 +0000804 SmallVector<llvm::Constant *, 4> StaticData;
805 SmallVector<llvm::Value *, 2> DynamicData;
Richard Smith4def70d2012-10-09 19:52:38 +0000806
807 BinaryOperatorKind Opcode = Info.Opcode;
808 if (BinaryOperator::isCompoundAssignmentOp(Opcode))
809 Opcode = BinaryOperator::getOpForCompoundAssignment(Opcode);
810
811 StaticData.push_back(CGF.EmitCheckSourceLocation(Info.E->getExprLoc()));
812 const UnaryOperator *UO = dyn_cast<UnaryOperator>(Info.E);
813 if (UO && UO->getOpcode() == UO_Minus) {
814 CheckName = "negate_overflow";
815 StaticData.push_back(CGF.EmitCheckTypeDescriptor(UO->getType()));
816 DynamicData.push_back(Info.RHS);
817 } else {
818 if (BinaryOperator::isShiftOp(Opcode)) {
819 // Shift LHS negative or too large, or RHS out of bounds.
820 CheckName = "shift_out_of_bounds";
821 const BinaryOperator *BO = cast<BinaryOperator>(Info.E);
822 StaticData.push_back(
823 CGF.EmitCheckTypeDescriptor(BO->getLHS()->getType()));
824 StaticData.push_back(
825 CGF.EmitCheckTypeDescriptor(BO->getRHS()->getType()));
826 } else if (Opcode == BO_Div || Opcode == BO_Rem) {
827 // Divide or modulo by zero, or signed overflow (eg INT_MAX / -1).
828 CheckName = "divrem_overflow";
Will Dietz822023a2013-01-07 22:25:52 +0000829 StaticData.push_back(CGF.EmitCheckTypeDescriptor(Info.Ty));
Richard Smith4def70d2012-10-09 19:52:38 +0000830 } else {
831 // Signed arithmetic overflow (+, -, *).
832 switch (Opcode) {
833 case BO_Add: CheckName = "add_overflow"; break;
834 case BO_Sub: CheckName = "sub_overflow"; break;
835 case BO_Mul: CheckName = "mul_overflow"; break;
836 default: llvm_unreachable("unexpected opcode for bin op check");
837 }
Will Dietz822023a2013-01-07 22:25:52 +0000838 StaticData.push_back(CGF.EmitCheckTypeDescriptor(Info.Ty));
Richard Smith4def70d2012-10-09 19:52:38 +0000839 }
840 DynamicData.push_back(Info.LHS);
841 DynamicData.push_back(Info.RHS);
842 }
843
Will Dietzad954812012-12-02 19:50:33 +0000844 CGF.EmitCheck(Check, CheckName, StaticData, DynamicData,
845 CodeGenFunction::CRK_Recoverable);
Richard Smith4def70d2012-10-09 19:52:38 +0000846}
847
Chris Lattner7f02f722007-08-24 05:35:26 +0000848//===----------------------------------------------------------------------===//
849// Visitor Methods
850//===----------------------------------------------------------------------===//
851
852Value *ScalarExprEmitter::VisitExpr(Expr *E) {
Daniel Dunbar488e9932008-08-16 00:56:44 +0000853 CGF.ErrorUnsupported(E, "scalar expression");
Chris Lattner7f02f722007-08-24 05:35:26 +0000854 if (E->getType()->isVoidType())
855 return 0;
Owen Anderson03e20502009-07-30 23:11:26 +0000856 return llvm::UndefValue::get(CGF.ConvertType(E->getType()));
Chris Lattner7f02f722007-08-24 05:35:26 +0000857}
858
Eli Friedmand38617c2008-05-14 19:38:39 +0000859Value *ScalarExprEmitter::VisitShuffleVectorExpr(ShuffleVectorExpr *E) {
Nate Begeman37b6a572010-06-08 00:16:34 +0000860 // Vector Mask Case
861 if (E->getNumSubExprs() == 2 ||
Rafael Espindola3f4cb122010-06-09 02:17:08 +0000862 (E->getNumSubExprs() == 3 && E->getExpr(2)->getType()->isVectorType())) {
Chris Lattner77b89b82010-06-27 07:15:29 +0000863 Value *LHS = CGF.EmitScalarExpr(E->getExpr(0));
864 Value *RHS = CGF.EmitScalarExpr(E->getExpr(1));
865 Value *Mask;
Nate Begeman37b6a572010-06-08 00:16:34 +0000866
Chris Lattner2acc6e32011-07-18 04:24:23 +0000867 llvm::VectorType *LTy = cast<llvm::VectorType>(LHS->getType());
Nate Begeman37b6a572010-06-08 00:16:34 +0000868 unsigned LHSElts = LTy->getNumElements();
869
870 if (E->getNumSubExprs() == 3) {
871 Mask = CGF.EmitScalarExpr(E->getExpr(2));
872
873 // Shuffle LHS & RHS into one input vector.
Chris Lattner5f9e2722011-07-23 10:55:15 +0000874 SmallVector<llvm::Constant*, 32> concat;
Nate Begeman37b6a572010-06-08 00:16:34 +0000875 for (unsigned i = 0; i != LHSElts; ++i) {
Chris Lattner48431f92011-04-19 22:55:03 +0000876 concat.push_back(Builder.getInt32(2*i));
877 concat.push_back(Builder.getInt32(2*i+1));
Nate Begeman37b6a572010-06-08 00:16:34 +0000878 }
879
Chris Lattnerfb018d12011-02-15 00:14:06 +0000880 Value* CV = llvm::ConstantVector::get(concat);
Nate Begeman37b6a572010-06-08 00:16:34 +0000881 LHS = Builder.CreateShuffleVector(LHS, RHS, CV, "concat");
882 LHSElts *= 2;
883 } else {
884 Mask = RHS;
885 }
886
Chris Lattner2acc6e32011-07-18 04:24:23 +0000887 llvm::VectorType *MTy = cast<llvm::VectorType>(Mask->getType());
Nate Begeman37b6a572010-06-08 00:16:34 +0000888 llvm::Constant* EltMask;
889
890 // Treat vec3 like vec4.
891 if ((LHSElts == 6) && (E->getNumSubExprs() == 3))
892 EltMask = llvm::ConstantInt::get(MTy->getElementType(),
893 (1 << llvm::Log2_32(LHSElts+2))-1);
894 else if ((LHSElts == 3) && (E->getNumSubExprs() == 2))
895 EltMask = llvm::ConstantInt::get(MTy->getElementType(),
896 (1 << llvm::Log2_32(LHSElts+1))-1);
897 else
898 EltMask = llvm::ConstantInt::get(MTy->getElementType(),
899 (1 << llvm::Log2_32(LHSElts))-1);
900
901 // Mask off the high bits of each shuffle index.
Chris Lattner2ce88422012-01-25 05:34:41 +0000902 Value *MaskBits = llvm::ConstantVector::getSplat(MTy->getNumElements(),
903 EltMask);
Nate Begeman37b6a572010-06-08 00:16:34 +0000904 Mask = Builder.CreateAnd(Mask, MaskBits, "mask");
905
906 // newv = undef
907 // mask = mask & maskbits
908 // for each elt
909 // n = extract mask i
910 // x = extract val n
911 // newv = insert newv, x, i
Chris Lattner2acc6e32011-07-18 04:24:23 +0000912 llvm::VectorType *RTy = llvm::VectorType::get(LTy->getElementType(),
Nate Begeman37b6a572010-06-08 00:16:34 +0000913 MTy->getNumElements());
914 Value* NewV = llvm::UndefValue::get(RTy);
915 for (unsigned i = 0, e = MTy->getNumElements(); i != e; ++i) {
Eli Friedman87b9c032012-04-05 21:48:40 +0000916 Value *IIndx = Builder.getInt32(i);
917 Value *Indx = Builder.CreateExtractElement(Mask, IIndx, "shuf_idx");
Chris Lattner77b89b82010-06-27 07:15:29 +0000918 Indx = Builder.CreateZExt(Indx, CGF.Int32Ty, "idx_zext");
Nate Begeman37b6a572010-06-08 00:16:34 +0000919
920 // Handle vec3 special since the index will be off by one for the RHS.
921 if ((LHSElts == 6) && (E->getNumSubExprs() == 3)) {
922 Value *cmpIndx, *newIndx;
Chris Lattner48431f92011-04-19 22:55:03 +0000923 cmpIndx = Builder.CreateICmpUGT(Indx, Builder.getInt32(3),
Nate Begeman37b6a572010-06-08 00:16:34 +0000924 "cmp_shuf_idx");
Chris Lattner48431f92011-04-19 22:55:03 +0000925 newIndx = Builder.CreateSub(Indx, Builder.getInt32(1), "shuf_idx_adj");
Nate Begeman37b6a572010-06-08 00:16:34 +0000926 Indx = Builder.CreateSelect(cmpIndx, newIndx, Indx, "sel_shuf_idx");
927 }
928 Value *VExt = Builder.CreateExtractElement(LHS, Indx, "shuf_elt");
Eli Friedman87b9c032012-04-05 21:48:40 +0000929 NewV = Builder.CreateInsertElement(NewV, VExt, IIndx, "shuf_ins");
Nate Begeman37b6a572010-06-08 00:16:34 +0000930 }
931 return NewV;
Eli Friedmand38617c2008-05-14 19:38:39 +0000932 }
Nate Begeman37b6a572010-06-08 00:16:34 +0000933
Eli Friedmand38617c2008-05-14 19:38:39 +0000934 Value* V1 = CGF.EmitScalarExpr(E->getExpr(0));
935 Value* V2 = CGF.EmitScalarExpr(E->getExpr(1));
Nate Begeman37b6a572010-06-08 00:16:34 +0000936
937 // Handle vec3 special since the index will be off by one for the RHS.
Chris Lattner2acc6e32011-07-18 04:24:23 +0000938 llvm::VectorType *VTy = cast<llvm::VectorType>(V1->getType());
Chris Lattner5f9e2722011-07-23 10:55:15 +0000939 SmallVector<llvm::Constant*, 32> indices;
Nate Begeman37b6a572010-06-08 00:16:34 +0000940 for (unsigned i = 2; i < E->getNumSubExprs(); i++) {
Eli Friedman0eb47fc2011-05-19 00:37:32 +0000941 unsigned Idx = E->getShuffleMaskIdx(CGF.getContext(), i-2);
942 if (VTy->getNumElements() == 3 && Idx > 3)
943 Idx -= 1;
944 indices.push_back(Builder.getInt32(Idx));
Nate Begeman37b6a572010-06-08 00:16:34 +0000945 }
946
Chris Lattnerfb018d12011-02-15 00:14:06 +0000947 Value *SV = llvm::ConstantVector::get(indices);
Eli Friedmand38617c2008-05-14 19:38:39 +0000948 return Builder.CreateShuffleVector(V1, V2, SV, "shuffle");
949}
Eli Friedman28665272009-11-26 03:22:21 +0000950Value *ScalarExprEmitter::VisitMemberExpr(MemberExpr *E) {
Richard Smith80d4b552011-12-28 19:48:30 +0000951 llvm::APSInt Value;
952 if (E->EvaluateAsInt(Value, CGF.getContext(), Expr::SE_AllowSideEffects)) {
Eli Friedman28665272009-11-26 03:22:21 +0000953 if (E->isArrow())
954 CGF.EmitScalarExpr(E->getBase());
955 else
956 EmitLValue(E->getBase());
Richard Smith80d4b552011-12-28 19:48:30 +0000957 return Builder.getInt(Value);
Eli Friedman28665272009-11-26 03:22:21 +0000958 }
Devang Patel78ba3d42010-10-04 21:46:04 +0000959
Alexey Samsonov3a70cd62012-04-27 07:24:20 +0000960 // Emit debug info for aggregate now, if it was delayed to reduce
Devang Patel78ba3d42010-10-04 21:46:04 +0000961 // debug info size.
962 CGDebugInfo *DI = CGF.getDebugInfo();
Alexey Samsonov3a70cd62012-04-27 07:24:20 +0000963 if (DI &&
Douglas Gregor4cdad312012-10-23 20:05:01 +0000964 CGF.CGM.getCodeGenOpts().getDebugInfo()
965 == CodeGenOptions::LimitedDebugInfo) {
Devang Patel78ba3d42010-10-04 21:46:04 +0000966 QualType PQTy = E->getBase()->IgnoreParenImpCasts()->getType();
967 if (const PointerType * PTy = dyn_cast<PointerType>(PQTy))
Devang Patel49c84652010-10-04 22:28:23 +0000968 if (FieldDecl *M = dyn_cast<FieldDecl>(E->getMemberDecl()))
Alexey Samsonov3a70cd62012-04-27 07:24:20 +0000969 DI->getOrCreateRecordType(PTy->getPointeeType(),
Devang Patel78ba3d42010-10-04 21:46:04 +0000970 M->getParent()->getLocation());
Devang Patel7fa8ab22010-10-04 22:13:18 +0000971 }
Eli Friedman28665272009-11-26 03:22:21 +0000972 return EmitLoadOfLValue(E);
973}
Eli Friedmand38617c2008-05-14 19:38:39 +0000974
Chris Lattner7f02f722007-08-24 05:35:26 +0000975Value *ScalarExprEmitter::VisitArraySubscriptExpr(ArraySubscriptExpr *E) {
Mike Stump7f79f9b2009-05-29 15:46:01 +0000976 TestAndClearIgnoreResultAssign();
977
Chris Lattner7f02f722007-08-24 05:35:26 +0000978 // Emit subscript expressions in rvalue context's. For most cases, this just
979 // loads the lvalue formed by the subscript expr. However, we have to be
980 // careful, because the base of a vector subscript is occasionally an rvalue,
981 // so we can't get it as an lvalue.
982 if (!E->getBase()->getType()->isVectorType())
983 return EmitLoadOfLValue(E);
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000984
Chris Lattner7f02f722007-08-24 05:35:26 +0000985 // Handle the vector case. The base must be a vector, the index must be an
986 // integer value.
987 Value *Base = Visit(E->getBase());
988 Value *Idx = Visit(E->getIdx());
Richard Smitha0a628f2013-02-23 02:53:19 +0000989 QualType IdxTy = E->getIdx()->getType();
990
991 if (CGF.SanOpts->Bounds)
992 CGF.EmitBoundsCheck(E, E->getBase(), Idx, IdxTy, /*Accessed*/true);
993
994 bool IdxSigned = IdxTy->isSignedIntegerOrEnumerationType();
Chris Lattner77b89b82010-06-27 07:15:29 +0000995 Idx = Builder.CreateIntCast(Idx, CGF.Int32Ty, IdxSigned, "vecidxcast");
Chris Lattner7f02f722007-08-24 05:35:26 +0000996 return Builder.CreateExtractElement(Base, Idx, "vecext");
997}
998
Nate Begeman0533b302009-10-18 20:10:40 +0000999static llvm::Constant *getMaskElt(llvm::ShuffleVectorInst *SVI, unsigned Idx,
Chris Lattner2acc6e32011-07-18 04:24:23 +00001000 unsigned Off, llvm::Type *I32Ty) {
Nate Begeman0533b302009-10-18 20:10:40 +00001001 int MV = SVI->getMaskValue(Idx);
1002 if (MV == -1)
1003 return llvm::UndefValue::get(I32Ty);
1004 return llvm::ConstantInt::get(I32Ty, Off+MV);
1005}
1006
1007Value *ScalarExprEmitter::VisitInitListExpr(InitListExpr *E) {
1008 bool Ignore = TestAndClearIgnoreResultAssign();
1009 (void)Ignore;
1010 assert (Ignore == false && "init list ignored");
1011 unsigned NumInitElements = E->getNumInits();
1012
1013 if (E->hadArrayRangeDesignator())
1014 CGF.ErrorUnsupported(E, "GNU array range designator extension");
1015
Chris Lattner2acc6e32011-07-18 04:24:23 +00001016 llvm::VectorType *VType =
Nate Begeman0533b302009-10-18 20:10:40 +00001017 dyn_cast<llvm::VectorType>(ConvertType(E->getType()));
1018
Sebastian Redlcea8d962011-09-24 17:48:14 +00001019 if (!VType) {
1020 if (NumInitElements == 0) {
1021 // C++11 value-initialization for the scalar.
1022 return EmitNullValue(E->getType());
1023 }
1024 // We have a scalar in braces. Just use the first element.
Nate Begeman0533b302009-10-18 20:10:40 +00001025 return Visit(E->getInit(0));
Sebastian Redlcea8d962011-09-24 17:48:14 +00001026 }
Nate Begeman0533b302009-10-18 20:10:40 +00001027
1028 unsigned ResElts = VType->getNumElements();
Nate Begeman0533b302009-10-18 20:10:40 +00001029
1030 // Loop over initializers collecting the Value for each, and remembering
1031 // whether the source was swizzle (ExtVectorElementExpr). This will allow
1032 // us to fold the shuffle for the swizzle into the shuffle for the vector
1033 // initializer, since LLVM optimizers generally do not want to touch
1034 // shuffles.
1035 unsigned CurIdx = 0;
1036 bool VIsUndefShuffle = false;
1037 llvm::Value *V = llvm::UndefValue::get(VType);
1038 for (unsigned i = 0; i != NumInitElements; ++i) {
1039 Expr *IE = E->getInit(i);
1040 Value *Init = Visit(IE);
Chris Lattner5f9e2722011-07-23 10:55:15 +00001041 SmallVector<llvm::Constant*, 16> Args;
Nate Begeman0533b302009-10-18 20:10:40 +00001042
Chris Lattner2acc6e32011-07-18 04:24:23 +00001043 llvm::VectorType *VVT = dyn_cast<llvm::VectorType>(Init->getType());
Nate Begeman0533b302009-10-18 20:10:40 +00001044
1045 // Handle scalar elements. If the scalar initializer is actually one
1046 // element of a different vector of the same width, use shuffle instead of
1047 // extract+insert.
1048 if (!VVT) {
1049 if (isa<ExtVectorElementExpr>(IE)) {
1050 llvm::ExtractElementInst *EI = cast<llvm::ExtractElementInst>(Init);
1051
1052 if (EI->getVectorOperandType()->getNumElements() == ResElts) {
1053 llvm::ConstantInt *C = cast<llvm::ConstantInt>(EI->getIndexOperand());
1054 Value *LHS = 0, *RHS = 0;
1055 if (CurIdx == 0) {
1056 // insert into undef -> shuffle (src, undef)
1057 Args.push_back(C);
Benjamin Kramer14c59822012-02-14 12:06:21 +00001058 Args.resize(ResElts, llvm::UndefValue::get(CGF.Int32Ty));
Nate Begeman0533b302009-10-18 20:10:40 +00001059
1060 LHS = EI->getVectorOperand();
1061 RHS = V;
1062 VIsUndefShuffle = true;
1063 } else if (VIsUndefShuffle) {
1064 // insert into undefshuffle && size match -> shuffle (v, src)
1065 llvm::ShuffleVectorInst *SVV = cast<llvm::ShuffleVectorInst>(V);
1066 for (unsigned j = 0; j != CurIdx; ++j)
Chris Lattner77b89b82010-06-27 07:15:29 +00001067 Args.push_back(getMaskElt(SVV, j, 0, CGF.Int32Ty));
Chris Lattner48431f92011-04-19 22:55:03 +00001068 Args.push_back(Builder.getInt32(ResElts + C->getZExtValue()));
Benjamin Kramer14c59822012-02-14 12:06:21 +00001069 Args.resize(ResElts, llvm::UndefValue::get(CGF.Int32Ty));
1070
Nate Begeman0533b302009-10-18 20:10:40 +00001071 LHS = cast<llvm::ShuffleVectorInst>(V)->getOperand(0);
1072 RHS = EI->getVectorOperand();
1073 VIsUndefShuffle = false;
1074 }
1075 if (!Args.empty()) {
Chris Lattnerfb018d12011-02-15 00:14:06 +00001076 llvm::Constant *Mask = llvm::ConstantVector::get(Args);
Nate Begeman0533b302009-10-18 20:10:40 +00001077 V = Builder.CreateShuffleVector(LHS, RHS, Mask);
1078 ++CurIdx;
1079 continue;
1080 }
1081 }
1082 }
Chris Lattner48431f92011-04-19 22:55:03 +00001083 V = Builder.CreateInsertElement(V, Init, Builder.getInt32(CurIdx),
1084 "vecinit");
Nate Begeman0533b302009-10-18 20:10:40 +00001085 VIsUndefShuffle = false;
1086 ++CurIdx;
1087 continue;
1088 }
1089
1090 unsigned InitElts = VVT->getNumElements();
1091
1092 // If the initializer is an ExtVecEltExpr (a swizzle), and the swizzle's
1093 // input is the same width as the vector being constructed, generate an
1094 // optimized shuffle of the swizzle input into the result.
Nate Begemana99f0832009-10-25 02:26:01 +00001095 unsigned Offset = (CurIdx == 0) ? 0 : ResElts;
Nate Begeman0533b302009-10-18 20:10:40 +00001096 if (isa<ExtVectorElementExpr>(IE)) {
1097 llvm::ShuffleVectorInst *SVI = cast<llvm::ShuffleVectorInst>(Init);
1098 Value *SVOp = SVI->getOperand(0);
Chris Lattner2acc6e32011-07-18 04:24:23 +00001099 llvm::VectorType *OpTy = cast<llvm::VectorType>(SVOp->getType());
Nate Begeman0533b302009-10-18 20:10:40 +00001100
1101 if (OpTy->getNumElements() == ResElts) {
Nate Begeman0533b302009-10-18 20:10:40 +00001102 for (unsigned j = 0; j != CurIdx; ++j) {
1103 // If the current vector initializer is a shuffle with undef, merge
1104 // this shuffle directly into it.
1105 if (VIsUndefShuffle) {
1106 Args.push_back(getMaskElt(cast<llvm::ShuffleVectorInst>(V), j, 0,
Chris Lattner77b89b82010-06-27 07:15:29 +00001107 CGF.Int32Ty));
Nate Begeman0533b302009-10-18 20:10:40 +00001108 } else {
Chris Lattner48431f92011-04-19 22:55:03 +00001109 Args.push_back(Builder.getInt32(j));
Nate Begeman0533b302009-10-18 20:10:40 +00001110 }
1111 }
1112 for (unsigned j = 0, je = InitElts; j != je; ++j)
Chris Lattner77b89b82010-06-27 07:15:29 +00001113 Args.push_back(getMaskElt(SVI, j, Offset, CGF.Int32Ty));
Benjamin Kramer14c59822012-02-14 12:06:21 +00001114 Args.resize(ResElts, llvm::UndefValue::get(CGF.Int32Ty));
Nate Begeman0533b302009-10-18 20:10:40 +00001115
1116 if (VIsUndefShuffle)
1117 V = cast<llvm::ShuffleVectorInst>(V)->getOperand(0);
1118
1119 Init = SVOp;
1120 }
1121 }
1122
1123 // Extend init to result vector length, and then shuffle its contribution
1124 // to the vector initializer into V.
1125 if (Args.empty()) {
1126 for (unsigned j = 0; j != InitElts; ++j)
Chris Lattner48431f92011-04-19 22:55:03 +00001127 Args.push_back(Builder.getInt32(j));
Benjamin Kramer14c59822012-02-14 12:06:21 +00001128 Args.resize(ResElts, llvm::UndefValue::get(CGF.Int32Ty));
Chris Lattnerfb018d12011-02-15 00:14:06 +00001129 llvm::Constant *Mask = llvm::ConstantVector::get(Args);
Nate Begeman0533b302009-10-18 20:10:40 +00001130 Init = Builder.CreateShuffleVector(Init, llvm::UndefValue::get(VVT),
Nate Begemana99f0832009-10-25 02:26:01 +00001131 Mask, "vext");
Nate Begeman0533b302009-10-18 20:10:40 +00001132
1133 Args.clear();
1134 for (unsigned j = 0; j != CurIdx; ++j)
Chris Lattner48431f92011-04-19 22:55:03 +00001135 Args.push_back(Builder.getInt32(j));
Nate Begeman0533b302009-10-18 20:10:40 +00001136 for (unsigned j = 0; j != InitElts; ++j)
Chris Lattner48431f92011-04-19 22:55:03 +00001137 Args.push_back(Builder.getInt32(j+Offset));
Benjamin Kramer14c59822012-02-14 12:06:21 +00001138 Args.resize(ResElts, llvm::UndefValue::get(CGF.Int32Ty));
Nate Begeman0533b302009-10-18 20:10:40 +00001139 }
1140
1141 // If V is undef, make sure it ends up on the RHS of the shuffle to aid
1142 // merging subsequent shuffles into this one.
1143 if (CurIdx == 0)
1144 std::swap(V, Init);
Chris Lattnerfb018d12011-02-15 00:14:06 +00001145 llvm::Constant *Mask = llvm::ConstantVector::get(Args);
Nate Begeman0533b302009-10-18 20:10:40 +00001146 V = Builder.CreateShuffleVector(V, Init, Mask, "vecinit");
1147 VIsUndefShuffle = isa<llvm::UndefValue>(Init);
1148 CurIdx += InitElts;
1149 }
1150
1151 // FIXME: evaluate codegen vs. shuffling against constant null vector.
1152 // Emit remaining default initializers.
Chris Lattner2acc6e32011-07-18 04:24:23 +00001153 llvm::Type *EltTy = VType->getElementType();
Nate Begeman0533b302009-10-18 20:10:40 +00001154
1155 // Emit remaining default initializers
1156 for (/* Do not initialize i*/; CurIdx < ResElts; ++CurIdx) {
Chris Lattner48431f92011-04-19 22:55:03 +00001157 Value *Idx = Builder.getInt32(CurIdx);
Nate Begeman0533b302009-10-18 20:10:40 +00001158 llvm::Value *Init = llvm::Constant::getNullValue(EltTy);
1159 V = Builder.CreateInsertElement(V, Init, Idx, "vecinit");
1160 }
1161 return V;
1162}
1163
Anders Carlssona3697c92009-11-23 17:57:54 +00001164static bool ShouldNullCheckClassCastValue(const CastExpr *CE) {
1165 const Expr *E = CE->getSubExpr();
John McCall23cba802010-03-30 23:58:03 +00001166
John McCall2de56d12010-08-25 11:45:40 +00001167 if (CE->getCastKind() == CK_UncheckedDerivedToBase)
John McCall23cba802010-03-30 23:58:03 +00001168 return false;
Anders Carlssona3697c92009-11-23 17:57:54 +00001169
1170 if (isa<CXXThisExpr>(E)) {
1171 // We always assume that 'this' is never null.
1172 return false;
1173 }
1174
1175 if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(CE)) {
Sebastian Redl906082e2010-07-20 04:20:21 +00001176 // And that glvalue casts are never null.
John McCall5baba9d2010-08-25 10:28:54 +00001177 if (ICE->getValueKind() != VK_RValue)
Anders Carlssona3697c92009-11-23 17:57:54 +00001178 return false;
1179 }
1180
1181 return true;
1182}
1183
Chris Lattner7f02f722007-08-24 05:35:26 +00001184// VisitCastExpr - Emit code for an explicit or implicit cast. Implicit casts
1185// have to handle a more broad range of conversions than explicit casts, as they
1186// handle things like function to ptr-to-function decay etc.
John McCallbc8d40d2011-06-24 21:55:10 +00001187Value *ScalarExprEmitter::VisitCastExpr(CastExpr *CE) {
Eli Friedmand8889622009-11-27 04:41:50 +00001188 Expr *E = CE->getSubExpr();
Anders Carlsson592a2bb2009-09-22 22:00:46 +00001189 QualType DestTy = CE->getType();
John McCall2de56d12010-08-25 11:45:40 +00001190 CastKind Kind = CE->getCastKind();
Anders Carlsson592a2bb2009-09-22 22:00:46 +00001191
Mike Stump7f79f9b2009-05-29 15:46:01 +00001192 if (!DestTy->isVoidType())
1193 TestAndClearIgnoreResultAssign();
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001194
Eli Friedman8c3e7e72009-11-27 02:07:44 +00001195 // Since almost all cast kinds apply to scalars, this switch doesn't have
1196 // a default case, so the compiler will warn on a missing case. The cases
1197 // are in the same order as in the CastKind enum.
Anders Carlssone9776242009-08-24 18:26:39 +00001198 switch (Kind) {
John McCalldaa8e4e2010-11-15 09:13:47 +00001199 case CK_Dependent: llvm_unreachable("dependent cast kind in IR gen!");
Eli Friedmana6c66ce2012-08-31 00:14:07 +00001200 case CK_BuiltinFnToFnPtr:
1201 llvm_unreachable("builtin functions are handled elsewhere");
1202
John McCall2de56d12010-08-25 11:45:40 +00001203 case CK_LValueBitCast:
1204 case CK_ObjCObjectLValueCast: {
Douglas Gregore39a3892010-07-13 23:17:26 +00001205 Value *V = EmitLValue(E).getAddress();
1206 V = Builder.CreateBitCast(V,
1207 ConvertType(CGF.getContext().getPointerType(DestTy)));
Eli Friedmand71f4422011-12-19 23:03:09 +00001208 return EmitLoadOfLValue(CGF.MakeNaturalAlignAddrLValue(V, DestTy));
Douglas Gregore39a3892010-07-13 23:17:26 +00001209 }
John McCalldc05b112011-09-10 01:16:55 +00001210
John McCall1d9b3b22011-09-09 05:25:32 +00001211 case CK_CPointerToObjCPointerCast:
1212 case CK_BlockPointerToObjCPointerCast:
John McCall2de56d12010-08-25 11:45:40 +00001213 case CK_AnyPointerToBlockPointerCast:
1214 case CK_BitCast: {
Anders Carlssoncb3c3082009-09-01 20:52:42 +00001215 Value *Src = Visit(const_cast<Expr*>(E));
1216 return Builder.CreateBitCast(Src, ConvertType(DestTy));
1217 }
David Chisnall7a7ee302012-01-16 17:27:18 +00001218 case CK_AtomicToNonAtomic:
1219 case CK_NonAtomicToAtomic:
John McCall2de56d12010-08-25 11:45:40 +00001220 case CK_NoOp:
1221 case CK_UserDefinedConversion:
Eli Friedmanad35a832009-11-16 21:33:53 +00001222 return Visit(const_cast<Expr*>(E));
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001223
John McCall2de56d12010-08-25 11:45:40 +00001224 case CK_BaseToDerived: {
Jordan Rose041ce8e2012-10-03 01:08:28 +00001225 const CXXRecordDecl *DerivedClassDecl = DestTy->getPointeeCXXRecordDecl();
1226 assert(DerivedClassDecl && "BaseToDerived arg isn't a C++ object pointer!");
1227
Richard Smithc7648302013-02-13 21:18:23 +00001228 llvm::Value *V = Visit(E);
1229
1230 // C++11 [expr.static.cast]p11: Behavior is undefined if a downcast is
1231 // performed and the object is not of the derived type.
1232 if (CGF.SanitizePerformTypeCheck)
1233 CGF.EmitTypeCheck(CodeGenFunction::TCK_DowncastPointer, CE->getExprLoc(),
1234 V, DestTy->getPointeeType());
1235
1236 return CGF.GetAddressOfDerivedClass(V, DerivedClassDecl,
John McCallf871d0c2010-08-07 06:22:56 +00001237 CE->path_begin(), CE->path_end(),
Anders Carlssona04efdf2010-04-24 21:23:59 +00001238 ShouldNullCheckClassCastValue(CE));
Anders Carlssona3697c92009-11-23 17:57:54 +00001239 }
John McCall2de56d12010-08-25 11:45:40 +00001240 case CK_UncheckedDerivedToBase:
1241 case CK_DerivedToBase: {
Jordan Rose041ce8e2012-10-03 01:08:28 +00001242 const CXXRecordDecl *DerivedClassDecl =
1243 E->getType()->getPointeeCXXRecordDecl();
1244 assert(DerivedClassDecl && "DerivedToBase arg isn't a C++ object pointer!");
Anders Carlsson191dfe92009-09-12 04:57:16 +00001245
Anders Carlsson34a2d382010-04-24 21:06:20 +00001246 return CGF.GetAddressOfBaseClass(Visit(E), DerivedClassDecl,
John McCallf871d0c2010-08-07 06:22:56 +00001247 CE->path_begin(), CE->path_end(),
Anders Carlsson34a2d382010-04-24 21:06:20 +00001248 ShouldNullCheckClassCastValue(CE));
Anders Carlsson191dfe92009-09-12 04:57:16 +00001249 }
Anders Carlsson575b3742011-04-11 02:03:26 +00001250 case CK_Dynamic: {
Eli Friedman8c3e7e72009-11-27 02:07:44 +00001251 Value *V = Visit(const_cast<Expr*>(E));
1252 const CXXDynamicCastExpr *DCE = cast<CXXDynamicCastExpr>(CE);
1253 return CGF.EmitDynamicCast(V, DCE);
1254 }
Eli Friedmand8889622009-11-27 04:41:50 +00001255
John McCall2de56d12010-08-25 11:45:40 +00001256 case CK_ArrayToPointerDecay: {
Eli Friedmanad35a832009-11-16 21:33:53 +00001257 assert(E->getType()->isArrayType() &&
1258 "Array to pointer decay must have array source type!");
1259
1260 Value *V = EmitLValue(E).getAddress(); // Bitfields can't be arrays.
1261
1262 // Note that VLA pointers are always decayed, so we don't need to do
1263 // anything here.
1264 if (!E->getType()->isVariableArrayType()) {
1265 assert(isa<llvm::PointerType>(V->getType()) && "Expected pointer");
1266 assert(isa<llvm::ArrayType>(cast<llvm::PointerType>(V->getType())
1267 ->getElementType()) &&
1268 "Expected pointer to array");
1269 V = Builder.CreateStructGEP(V, 0, "arraydecay");
1270 }
1271
Chris Lattner410b12e2011-07-20 04:31:01 +00001272 // Make sure the array decay ends up being the right type. This matters if
1273 // the array type was of an incomplete type.
Chris Lattnercb8095f2011-07-20 04:59:57 +00001274 return CGF.Builder.CreateBitCast(V, ConvertType(CE->getType()));
Eli Friedmanad35a832009-11-16 21:33:53 +00001275 }
John McCall2de56d12010-08-25 11:45:40 +00001276 case CK_FunctionToPointerDecay:
Eli Friedmanad35a832009-11-16 21:33:53 +00001277 return EmitLValue(E).getAddress();
1278
John McCall404cd162010-11-13 01:35:44 +00001279 case CK_NullToPointer:
1280 if (MustVisitNullValue(E))
1281 (void) Visit(E);
1282
1283 return llvm::ConstantPointerNull::get(
1284 cast<llvm::PointerType>(ConvertType(DestTy)));
1285
John McCall2de56d12010-08-25 11:45:40 +00001286 case CK_NullToMemberPointer: {
John McCall404cd162010-11-13 01:35:44 +00001287 if (MustVisitNullValue(E))
John McCalld608cdb2010-08-22 10:59:02 +00001288 (void) Visit(E);
1289
John McCall0bab0cd2010-08-23 01:21:21 +00001290 const MemberPointerType *MPT = CE->getType()->getAs<MemberPointerType>();
1291 return CGF.CGM.getCXXABI().EmitNullMemberPointer(MPT);
1292 }
Anders Carlsson191dfe92009-09-12 04:57:16 +00001293
John McCall4d4e5c12012-02-15 01:22:51 +00001294 case CK_ReinterpretMemberPointer:
John McCall2de56d12010-08-25 11:45:40 +00001295 case CK_BaseToDerivedMemberPointer:
1296 case CK_DerivedToBaseMemberPointer: {
Eli Friedmand8889622009-11-27 04:41:50 +00001297 Value *Src = Visit(E);
John McCalld608cdb2010-08-22 10:59:02 +00001298
1299 // Note that the AST doesn't distinguish between checked and
1300 // unchecked member pointer conversions, so we always have to
1301 // implement checked conversions here. This is inefficient when
1302 // actual control flow may be required in order to perform the
1303 // check, which it is for data member pointers (but not member
1304 // function pointers on Itanium and ARM).
John McCall0bab0cd2010-08-23 01:21:21 +00001305 return CGF.CGM.getCXXABI().EmitMemberPointerConversion(CGF, CE, Src);
Eli Friedmand8889622009-11-27 04:41:50 +00001306 }
John McCallf85e1932011-06-15 23:02:42 +00001307
John McCall33e56f32011-09-10 06:18:15 +00001308 case CK_ARCProduceObject:
John McCallf85e1932011-06-15 23:02:42 +00001309 return CGF.EmitARCRetainScalarExpr(E);
John McCall33e56f32011-09-10 06:18:15 +00001310 case CK_ARCConsumeObject:
John McCallf85e1932011-06-15 23:02:42 +00001311 return CGF.EmitObjCConsumeObject(E->getType(), Visit(E));
John McCall33e56f32011-09-10 06:18:15 +00001312 case CK_ARCReclaimReturnedObject: {
John McCall7e5e5f42011-07-07 06:58:02 +00001313 llvm::Value *value = Visit(E);
1314 value = CGF.EmitARCRetainAutoreleasedReturnValue(value);
1315 return CGF.EmitObjCConsumeObject(E->getType(), value);
1316 }
John McCall348f16f2011-10-04 06:23:45 +00001317 case CK_ARCExtendBlockObject:
1318 return CGF.EmitARCExtendBlockObject(E);
John McCallf85e1932011-06-15 23:02:42 +00001319
Douglas Gregorac1303e2012-02-22 05:02:47 +00001320 case CK_CopyAndAutoreleaseBlockObject:
Eli Friedmancae40c42012-02-28 01:08:45 +00001321 return CGF.EmitBlockCopyAndAutorelease(Visit(E), E->getType());
Douglas Gregorac1303e2012-02-22 05:02:47 +00001322
John McCall2bb5d002010-11-13 09:02:35 +00001323 case CK_FloatingRealToComplex:
1324 case CK_FloatingComplexCast:
1325 case CK_IntegralRealToComplex:
1326 case CK_IntegralComplexCast:
John McCallf3ea8cf2010-11-14 08:17:51 +00001327 case CK_IntegralComplexToFloatingComplex:
1328 case CK_FloatingComplexToIntegralComplex:
John McCall2de56d12010-08-25 11:45:40 +00001329 case CK_ConstructorConversion:
John McCall61ad0e62010-11-16 06:21:14 +00001330 case CK_ToUnion:
1331 llvm_unreachable("scalar cast to non-scalar value");
John McCallf6a16482010-12-04 03:47:34 +00001332
John McCall0ae287a2010-12-01 04:43:34 +00001333 case CK_LValueToRValue:
1334 assert(CGF.getContext().hasSameUnqualifiedType(E->getType(), DestTy));
John McCallf6a16482010-12-04 03:47:34 +00001335 assert(E->isGLValue() && "lvalue-to-rvalue applied to r-value!");
John McCall0ae287a2010-12-01 04:43:34 +00001336 return Visit(const_cast<Expr*>(E));
Eli Friedman8c3e7e72009-11-27 02:07:44 +00001337
John McCall2de56d12010-08-25 11:45:40 +00001338 case CK_IntegralToPointer: {
Anders Carlsson7f9e6462009-09-15 04:48:33 +00001339 Value *Src = Visit(const_cast<Expr*>(E));
Daniel Dunbar89f176d2010-08-25 03:32:38 +00001340
Anders Carlsson82debc72009-10-18 18:12:03 +00001341 // First, convert to the correct width so that we control the kind of
1342 // extension.
Chris Lattner2acc6e32011-07-18 04:24:23 +00001343 llvm::Type *MiddleTy = CGF.IntPtrTy;
Douglas Gregor575a1c92011-05-20 16:38:50 +00001344 bool InputSigned = E->getType()->isSignedIntegerOrEnumerationType();
Anders Carlsson82debc72009-10-18 18:12:03 +00001345 llvm::Value* IntResult =
1346 Builder.CreateIntCast(Src, MiddleTy, InputSigned, "conv");
Daniel Dunbar89f176d2010-08-25 03:32:38 +00001347
Anders Carlsson82debc72009-10-18 18:12:03 +00001348 return Builder.CreateIntToPtr(IntResult, ConvertType(DestTy));
Anders Carlsson7f9e6462009-09-15 04:48:33 +00001349 }
Eli Friedman65949422011-06-25 02:58:47 +00001350 case CK_PointerToIntegral:
1351 assert(!DestTy->isBooleanType() && "bool should use PointerToBool");
1352 return Builder.CreatePtrToInt(Visit(E), ConvertType(DestTy));
Daniel Dunbar89f176d2010-08-25 03:32:38 +00001353
John McCall2de56d12010-08-25 11:45:40 +00001354 case CK_ToVoid: {
John McCall2a416372010-12-05 02:00:02 +00001355 CGF.EmitIgnoredExpr(E);
Eli Friedmanad35a832009-11-16 21:33:53 +00001356 return 0;
1357 }
John McCall2de56d12010-08-25 11:45:40 +00001358 case CK_VectorSplat: {
Chris Lattner2acc6e32011-07-18 04:24:23 +00001359 llvm::Type *DstTy = ConvertType(DestTy);
Eli Friedmanad35a832009-11-16 21:33:53 +00001360 Value *Elt = Visit(const_cast<Expr*>(E));
Craig Topper5fa56082012-02-06 05:05:50 +00001361 Elt = EmitScalarConversion(Elt, E->getType(),
1362 DestTy->getAs<VectorType>()->getElementType());
Eli Friedmanad35a832009-11-16 21:33:53 +00001363
Eli Friedmanad35a832009-11-16 21:33:53 +00001364 // Splat the element across to all elements
Eli Friedmanad35a832009-11-16 21:33:53 +00001365 unsigned NumElements = cast<llvm::VectorType>(DstTy)->getNumElements();
Benjamin Kramer0b227082013-01-01 20:08:10 +00001366 return Builder.CreateVectorSplat(NumElements, Elt, "splat");;
Eli Friedmanad35a832009-11-16 21:33:53 +00001367 }
John McCalldaa8e4e2010-11-15 09:13:47 +00001368
John McCall2de56d12010-08-25 11:45:40 +00001369 case CK_IntegralCast:
1370 case CK_IntegralToFloating:
1371 case CK_FloatingToIntegral:
1372 case CK_FloatingCast:
Eli Friedmand8889622009-11-27 04:41:50 +00001373 return EmitScalarConversion(Visit(E), E->getType(), DestTy);
John McCalldaa8e4e2010-11-15 09:13:47 +00001374 case CK_IntegralToBoolean:
1375 return EmitIntToBoolConversion(Visit(E));
1376 case CK_PointerToBoolean:
1377 return EmitPointerToBoolConversion(Visit(E));
1378 case CK_FloatingToBoolean:
1379 return EmitFloatToBoolConversion(Visit(E));
John McCall2de56d12010-08-25 11:45:40 +00001380 case CK_MemberPointerToBoolean: {
John McCall0bab0cd2010-08-23 01:21:21 +00001381 llvm::Value *MemPtr = Visit(E);
1382 const MemberPointerType *MPT = E->getType()->getAs<MemberPointerType>();
1383 return CGF.CGM.getCXXABI().EmitMemberPointerIsNotNull(CGF, MemPtr, MPT);
Anders Carlssone9776242009-08-24 18:26:39 +00001384 }
John McCallf3ea8cf2010-11-14 08:17:51 +00001385
1386 case CK_FloatingComplexToReal:
1387 case CK_IntegralComplexToReal:
John McCallb418d742010-11-16 10:08:07 +00001388 return CGF.EmitComplexExpr(E, false, true).first;
John McCallf3ea8cf2010-11-14 08:17:51 +00001389
1390 case CK_FloatingComplexToBoolean:
1391 case CK_IntegralComplexToBoolean: {
John McCallb418d742010-11-16 10:08:07 +00001392 CodeGenFunction::ComplexPairTy V = CGF.EmitComplexExpr(E);
John McCallf3ea8cf2010-11-14 08:17:51 +00001393
1394 // TODO: kill this function off, inline appropriate case here
1395 return EmitComplexToScalarConversion(V, E->getType(), DestTy);
1396 }
1397
Guy Benyeie6b9d802013-01-20 12:31:11 +00001398 case CK_ZeroToOCLEvent: {
1399 assert(DestTy->isEventT() && "CK_ZeroToOCLEvent cast on non event type");
1400 return llvm::Constant::getNullValue(ConvertType(DestTy));
1401 }
1402
John McCall0bab0cd2010-08-23 01:21:21 +00001403 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001404
John McCall61ad0e62010-11-16 06:21:14 +00001405 llvm_unreachable("unknown scalar cast");
Chris Lattner7f02f722007-08-24 05:35:26 +00001406}
1407
Chris Lattner33793202007-08-31 22:09:40 +00001408Value *ScalarExprEmitter::VisitStmtExpr(const StmtExpr *E) {
John McCall150b4622011-01-26 04:00:11 +00001409 CodeGenFunction::StmtExprEvaluation eval(CGF);
1410 return CGF.EmitCompoundStmt(*E->getSubStmt(), !E->getType()->isVoidType())
1411 .getScalarVal();
Chris Lattner33793202007-08-31 22:09:40 +00001412}
1413
Chris Lattner7f02f722007-08-24 05:35:26 +00001414//===----------------------------------------------------------------------===//
1415// Unary Operators
1416//===----------------------------------------------------------------------===//
1417
Chris Lattner8c11a652010-06-26 22:09:34 +00001418llvm::Value *ScalarExprEmitter::
Anton Yartsev683564a2011-02-07 02:17:30 +00001419EmitAddConsiderOverflowBehavior(const UnaryOperator *E,
1420 llvm::Value *InVal,
1421 llvm::Value *NextVal, bool IsInc) {
Richard Smith7edf9e32012-11-01 22:30:59 +00001422 switch (CGF.getLangOpts().getSignedOverflowBehavior()) {
Anton Yartsev683564a2011-02-07 02:17:30 +00001423 case LangOptions::SOB_Defined:
1424 return Builder.CreateAdd(InVal, NextVal, IsInc ? "inc" : "dec");
Richard Smith9d3e2262012-08-25 00:32:28 +00001425 case LangOptions::SOB_Undefined:
Will Dietz4f45bc02013-01-18 11:30:38 +00001426 if (!CGF.SanOpts->SignedIntegerOverflow)
Richard Smith9d3e2262012-08-25 00:32:28 +00001427 return Builder.CreateNSWAdd(InVal, NextVal, IsInc ? "inc" : "dec");
1428 // Fall through.
Anton Yartsev683564a2011-02-07 02:17:30 +00001429 case LangOptions::SOB_Trapping:
1430 BinOpInfo BinOp;
1431 BinOp.LHS = InVal;
1432 BinOp.RHS = NextVal;
1433 BinOp.Ty = E->getType();
1434 BinOp.Opcode = BO_Add;
Benjamin Kramerddc57332012-10-03 20:58:04 +00001435 BinOp.FPContractable = false;
Anton Yartsev683564a2011-02-07 02:17:30 +00001436 BinOp.E = E;
1437 return EmitOverflowCheckedBinOp(BinOp);
Anton Yartsev683564a2011-02-07 02:17:30 +00001438 }
David Blaikieb219cfc2011-09-23 05:06:16 +00001439 llvm_unreachable("Unknown SignedOverflowBehaviorTy");
Anton Yartsev683564a2011-02-07 02:17:30 +00001440}
1441
John McCall5936e332011-02-15 09:22:45 +00001442llvm::Value *
1443ScalarExprEmitter::EmitScalarPrePostIncDec(const UnaryOperator *E, LValue LV,
1444 bool isInc, bool isPre) {
Chris Lattner8c11a652010-06-26 22:09:34 +00001445
John McCall5936e332011-02-15 09:22:45 +00001446 QualType type = E->getSubExpr()->getType();
David Chisnall7a7ee302012-01-16 17:27:18 +00001447 llvm::PHINode *atomicPHI = 0;
David Chisnall72c1dba2013-03-03 16:02:42 +00001448 llvm::Value *value;
1449 llvm::Value *input;
Anton Yartsev683564a2011-02-07 02:17:30 +00001450
John McCall5936e332011-02-15 09:22:45 +00001451 int amount = (isInc ? 1 : -1);
1452
David Chisnall7a7ee302012-01-16 17:27:18 +00001453 if (const AtomicType *atomicTy = type->getAs<AtomicType>()) {
David Chisnall72c1dba2013-03-03 16:02:42 +00001454 type = atomicTy->getValueType();
1455 if (isInc && type->isBooleanType()) {
1456 llvm::Value *True = CGF.EmitToMemory(Builder.getTrue(), type);
1457 if (isPre) {
1458 Builder.Insert(new llvm::StoreInst(True,
1459 LV.getAddress(), LV.isVolatileQualified(),
1460 LV.getAlignment().getQuantity(),
1461 llvm::SequentiallyConsistent));
1462 return Builder.getTrue();
1463 }
1464 // For atomic bool increment, we just store true and return it for
1465 // preincrement, do an atomic swap with true for postincrement
1466 return Builder.CreateAtomicRMW(llvm::AtomicRMWInst::Xchg,
1467 LV.getAddress(), True, llvm::SequentiallyConsistent);
1468 }
1469 // Special case for atomic increment / decrement on integers, emit
1470 // atomicrmw instructions. We skip this if we want to be doing overflow
1471 // checking, and fall into the slow path with the atomic cmpxchg loop.
1472 if (!type->isBooleanType() && type->isIntegerType() &&
1473 !(type->isUnsignedIntegerType() &&
1474 CGF.SanOpts->UnsignedIntegerOverflow) &&
1475 CGF.getLangOpts().getSignedOverflowBehavior() !=
1476 LangOptions::SOB_Trapping) {
1477 llvm::AtomicRMWInst::BinOp aop = isInc ? llvm::AtomicRMWInst::Add :
1478 llvm::AtomicRMWInst::Sub;
1479 llvm::Instruction::BinaryOps op = isInc ? llvm::Instruction::Add :
1480 llvm::Instruction::Sub;
1481 llvm::Value *amt = CGF.EmitToMemory(
1482 llvm::ConstantInt::get(ConvertType(type), 1, true), type);
1483 llvm::Value *old = Builder.CreateAtomicRMW(aop,
1484 LV.getAddress(), amt, llvm::SequentiallyConsistent);
1485 return isPre ? Builder.CreateBinOp(op, old, amt) : old;
1486 }
1487 value = EmitLoadOfLValue(LV);
1488 input = value;
1489 // For every other atomic operation, we need to emit a load-op-cmpxchg loop
David Chisnall7a7ee302012-01-16 17:27:18 +00001490 llvm::BasicBlock *startBB = Builder.GetInsertBlock();
1491 llvm::BasicBlock *opBB = CGF.createBasicBlock("atomic_op", CGF.CurFn);
David Chisnall72c1dba2013-03-03 16:02:42 +00001492 value = CGF.EmitToMemory(value, type);
David Chisnall7a7ee302012-01-16 17:27:18 +00001493 Builder.CreateBr(opBB);
1494 Builder.SetInsertPoint(opBB);
1495 atomicPHI = Builder.CreatePHI(value->getType(), 2);
1496 atomicPHI->addIncoming(value, startBB);
David Chisnall7a7ee302012-01-16 17:27:18 +00001497 value = atomicPHI;
David Chisnall72c1dba2013-03-03 16:02:42 +00001498 } else {
1499 value = EmitLoadOfLValue(LV);
1500 input = value;
David Chisnall7a7ee302012-01-16 17:27:18 +00001501 }
1502
John McCall5936e332011-02-15 09:22:45 +00001503 // Special case of integer increment that we have to check first: bool++.
1504 // Due to promotion rules, we get:
1505 // bool++ -> bool = bool + 1
1506 // -> bool = (int)bool + 1
1507 // -> bool = ((int)bool + 1 != 0)
1508 // An interesting aspect of this is that increment is always true.
1509 // Decrement does not have this property.
1510 if (isInc && type->isBooleanType()) {
1511 value = Builder.getTrue();
1512
1513 // Most common case by far: integer increment.
1514 } else if (type->isIntegerType()) {
1515
Michael Liao36d5cea2012-08-28 16:55:13 +00001516 llvm::Value *amt = llvm::ConstantInt::get(value->getType(), amount, true);
John McCall5936e332011-02-15 09:22:45 +00001517
Eli Friedmanfa0b4092011-03-02 01:49:12 +00001518 // Note that signed integer inc/dec with width less than int can't
1519 // overflow because of promotion rules; we're just eliding a few steps here.
Will Dietzb8540362012-11-27 15:01:55 +00001520 if (value->getType()->getPrimitiveSizeInBits() >=
1521 CGF.IntTy->getBitWidth() &&
1522 type->isSignedIntegerOrEnumerationType()) {
John McCall5936e332011-02-15 09:22:45 +00001523 value = EmitAddConsiderOverflowBehavior(E, value, amt, isInc);
Will Dietzb8540362012-11-27 15:01:55 +00001524 } else if (value->getType()->getPrimitiveSizeInBits() >=
Will Dietz4f45bc02013-01-18 11:30:38 +00001525 CGF.IntTy->getBitWidth() && type->isUnsignedIntegerType() &&
1526 CGF.SanOpts->UnsignedIntegerOverflow) {
Will Dietzb8540362012-11-27 15:01:55 +00001527 BinOpInfo BinOp;
1528 BinOp.LHS = value;
1529 BinOp.RHS = llvm::ConstantInt::get(value->getType(), 1, false);
1530 BinOp.Ty = E->getType();
1531 BinOp.Opcode = isInc ? BO_Add : BO_Sub;
1532 BinOp.FPContractable = false;
1533 BinOp.E = E;
1534 value = EmitOverflowCheckedBinOp(BinOp);
1535 } else
John McCall5936e332011-02-15 09:22:45 +00001536 value = Builder.CreateAdd(value, amt, isInc ? "inc" : "dec");
1537
1538 // Next most common: pointer increment.
1539 } else if (const PointerType *ptr = type->getAs<PointerType>()) {
1540 QualType type = ptr->getPointeeType();
1541
1542 // VLA types don't have constant size.
John McCall913dab22011-06-25 01:32:37 +00001543 if (const VariableArrayType *vla
1544 = CGF.getContext().getAsVariableArrayType(type)) {
1545 llvm::Value *numElts = CGF.getVLASize(vla).first;
John McCallbc8d40d2011-06-24 21:55:10 +00001546 if (!isInc) numElts = Builder.CreateNSWNeg(numElts, "vla.negsize");
Richard Smith7edf9e32012-11-01 22:30:59 +00001547 if (CGF.getLangOpts().isSignedOverflowDefined())
John McCallbc8d40d2011-06-24 21:55:10 +00001548 value = Builder.CreateGEP(value, numElts, "vla.inc");
Chris Lattner2cb42222011-03-01 00:03:48 +00001549 else
John McCallbc8d40d2011-06-24 21:55:10 +00001550 value = Builder.CreateInBoundsGEP(value, numElts, "vla.inc");
John McCall5936e332011-02-15 09:22:45 +00001551
1552 // Arithmetic on function pointers (!) is just +-1.
1553 } else if (type->isFunctionType()) {
Chris Lattner48431f92011-04-19 22:55:03 +00001554 llvm::Value *amt = Builder.getInt32(amount);
John McCall5936e332011-02-15 09:22:45 +00001555
1556 value = CGF.EmitCastToVoidPtr(value);
Richard Smith7edf9e32012-11-01 22:30:59 +00001557 if (CGF.getLangOpts().isSignedOverflowDefined())
Chris Lattner2cb42222011-03-01 00:03:48 +00001558 value = Builder.CreateGEP(value, amt, "incdec.funcptr");
1559 else
1560 value = Builder.CreateInBoundsGEP(value, amt, "incdec.funcptr");
John McCall5936e332011-02-15 09:22:45 +00001561 value = Builder.CreateBitCast(value, input->getType());
1562
1563 // For everything else, we can just do a simple increment.
Anton Yartsev683564a2011-02-07 02:17:30 +00001564 } else {
Chris Lattner48431f92011-04-19 22:55:03 +00001565 llvm::Value *amt = Builder.getInt32(amount);
Richard Smith7edf9e32012-11-01 22:30:59 +00001566 if (CGF.getLangOpts().isSignedOverflowDefined())
Chris Lattner2cb42222011-03-01 00:03:48 +00001567 value = Builder.CreateGEP(value, amt, "incdec.ptr");
1568 else
1569 value = Builder.CreateInBoundsGEP(value, amt, "incdec.ptr");
John McCall5936e332011-02-15 09:22:45 +00001570 }
1571
1572 // Vector increment/decrement.
1573 } else if (type->isVectorType()) {
1574 if (type->hasIntegerRepresentation()) {
1575 llvm::Value *amt = llvm::ConstantInt::get(value->getType(), amount);
1576
Eli Friedmand4b9ee32011-05-06 18:04:18 +00001577 value = Builder.CreateAdd(value, amt, isInc ? "inc" : "dec");
John McCall5936e332011-02-15 09:22:45 +00001578 } else {
1579 value = Builder.CreateFAdd(
1580 value,
1581 llvm::ConstantFP::get(value->getType(), amount),
Anton Yartsev683564a2011-02-07 02:17:30 +00001582 isInc ? "inc" : "dec");
1583 }
Anton Yartsev683564a2011-02-07 02:17:30 +00001584
John McCall5936e332011-02-15 09:22:45 +00001585 // Floating point.
1586 } else if (type->isRealFloatingType()) {
Chris Lattner8c11a652010-06-26 22:09:34 +00001587 // Add the inc/dec to the real part.
John McCall5936e332011-02-15 09:22:45 +00001588 llvm::Value *amt;
Anton Korobeynikovaa4a99b2011-10-14 23:23:15 +00001589
Joey Gouly19dbb202013-01-23 11:56:20 +00001590 if (type->isHalfType() && !CGF.getContext().getLangOpts().NativeHalfType) {
Anton Korobeynikovaa4a99b2011-10-14 23:23:15 +00001591 // Another special case: half FP increment should be done via float
1592 value =
1593 Builder.CreateCall(CGF.CGM.getIntrinsic(llvm::Intrinsic::convert_from_fp16),
1594 input);
1595 }
1596
John McCall5936e332011-02-15 09:22:45 +00001597 if (value->getType()->isFloatTy())
1598 amt = llvm::ConstantFP::get(VMContext,
1599 llvm::APFloat(static_cast<float>(amount)));
1600 else if (value->getType()->isDoubleTy())
1601 amt = llvm::ConstantFP::get(VMContext,
1602 llvm::APFloat(static_cast<double>(amount)));
Chris Lattner8c11a652010-06-26 22:09:34 +00001603 else {
John McCall5936e332011-02-15 09:22:45 +00001604 llvm::APFloat F(static_cast<float>(amount));
Chris Lattner8c11a652010-06-26 22:09:34 +00001605 bool ignored;
1606 F.convert(CGF.Target.getLongDoubleFormat(), llvm::APFloat::rmTowardZero,
1607 &ignored);
John McCall5936e332011-02-15 09:22:45 +00001608 amt = llvm::ConstantFP::get(VMContext, F);
Chris Lattner8c11a652010-06-26 22:09:34 +00001609 }
John McCall5936e332011-02-15 09:22:45 +00001610 value = Builder.CreateFAdd(value, amt, isInc ? "inc" : "dec");
1611
Joey Gouly19dbb202013-01-23 11:56:20 +00001612 if (type->isHalfType() && !CGF.getContext().getLangOpts().NativeHalfType)
Anton Korobeynikovaa4a99b2011-10-14 23:23:15 +00001613 value =
1614 Builder.CreateCall(CGF.CGM.getIntrinsic(llvm::Intrinsic::convert_to_fp16),
1615 value);
1616
John McCall5936e332011-02-15 09:22:45 +00001617 // Objective-C pointer types.
1618 } else {
1619 const ObjCObjectPointerType *OPT = type->castAs<ObjCObjectPointerType>();
1620 value = CGF.EmitCastToVoidPtr(value);
1621
1622 CharUnits size = CGF.getContext().getTypeSizeInChars(OPT->getObjectType());
1623 if (!isInc) size = -size;
1624 llvm::Value *sizeValue =
1625 llvm::ConstantInt::get(CGF.SizeTy, size.getQuantity());
1626
Richard Smith7edf9e32012-11-01 22:30:59 +00001627 if (CGF.getLangOpts().isSignedOverflowDefined())
Chris Lattner2cb42222011-03-01 00:03:48 +00001628 value = Builder.CreateGEP(value, sizeValue, "incdec.objptr");
1629 else
1630 value = Builder.CreateInBoundsGEP(value, sizeValue, "incdec.objptr");
John McCall5936e332011-02-15 09:22:45 +00001631 value = Builder.CreateBitCast(value, input->getType());
Chris Lattner8c11a652010-06-26 22:09:34 +00001632 }
David Chisnall7a7ee302012-01-16 17:27:18 +00001633
1634 if (atomicPHI) {
1635 llvm::BasicBlock *opBB = Builder.GetInsertBlock();
1636 llvm::BasicBlock *contBB = CGF.createBasicBlock("atomic_cont", CGF.CurFn);
1637 llvm::Value *old = Builder.CreateAtomicCmpXchg(LV.getAddress(), atomicPHI,
David Chisnall72c1dba2013-03-03 16:02:42 +00001638 CGF.EmitToMemory(value, type), llvm::SequentiallyConsistent);
David Chisnall7a7ee302012-01-16 17:27:18 +00001639 atomicPHI->addIncoming(old, opBB);
1640 llvm::Value *success = Builder.CreateICmpEQ(old, atomicPHI);
1641 Builder.CreateCondBr(success, contBB, opBB);
1642 Builder.SetInsertPoint(contBB);
1643 return isPre ? value : input;
1644 }
Anton Korobeynikovaa4a99b2011-10-14 23:23:15 +00001645
Chris Lattner8c11a652010-06-26 22:09:34 +00001646 // Store the updated result through the lvalue.
1647 if (LV.isBitField())
John McCall545d9962011-06-25 02:11:03 +00001648 CGF.EmitStoreThroughBitfieldLValue(RValue::get(value), LV, &value);
Chris Lattner8c11a652010-06-26 22:09:34 +00001649 else
John McCall545d9962011-06-25 02:11:03 +00001650 CGF.EmitStoreThroughLValue(RValue::get(value), LV);
Anton Korobeynikovaa4a99b2011-10-14 23:23:15 +00001651
Chris Lattner8c11a652010-06-26 22:09:34 +00001652 // If this is a postinc, return the value read from memory, otherwise use the
1653 // updated value.
John McCall5936e332011-02-15 09:22:45 +00001654 return isPre ? value : input;
Chris Lattner8c11a652010-06-26 22:09:34 +00001655}
1656
1657
1658
Chris Lattner7f02f722007-08-24 05:35:26 +00001659Value *ScalarExprEmitter::VisitUnaryMinus(const UnaryOperator *E) {
Mike Stump7f79f9b2009-05-29 15:46:01 +00001660 TestAndClearIgnoreResultAssign();
Chris Lattner9a207232010-06-26 21:48:21 +00001661 // Emit unary minus with EmitSub so we handle overflow cases etc.
1662 BinOpInfo BinOp;
Chris Lattner4ac0d832010-06-28 17:12:37 +00001663 BinOp.RHS = Visit(E->getSubExpr());
1664
1665 if (BinOp.RHS->getType()->isFPOrFPVectorTy())
1666 BinOp.LHS = llvm::ConstantFP::getZeroValueForNegation(BinOp.RHS->getType());
1667 else
1668 BinOp.LHS = llvm::Constant::getNullValue(BinOp.RHS->getType());
Chris Lattner9a207232010-06-26 21:48:21 +00001669 BinOp.Ty = E->getType();
John McCall2de56d12010-08-25 11:45:40 +00001670 BinOp.Opcode = BO_Sub;
Benjamin Kramerddc57332012-10-03 20:58:04 +00001671 BinOp.FPContractable = false;
Chris Lattner9a207232010-06-26 21:48:21 +00001672 BinOp.E = E;
1673 return EmitSub(BinOp);
Chris Lattner7f02f722007-08-24 05:35:26 +00001674}
1675
1676Value *ScalarExprEmitter::VisitUnaryNot(const UnaryOperator *E) {
Mike Stump7f79f9b2009-05-29 15:46:01 +00001677 TestAndClearIgnoreResultAssign();
Chris Lattner7f02f722007-08-24 05:35:26 +00001678 Value *Op = Visit(E->getSubExpr());
1679 return Builder.CreateNot(Op, "neg");
1680}
1681
1682Value *ScalarExprEmitter::VisitUnaryLNot(const UnaryOperator *E) {
Tanya Lattner4f692c22012-01-16 21:02:28 +00001683 // Perform vector logical not on comparison with zero vector.
1684 if (E->getType()->isExtVectorType()) {
1685 Value *Oper = Visit(E->getSubExpr());
1686 Value *Zero = llvm::Constant::getNullValue(Oper->getType());
Joey Gouly52e933b2013-02-21 11:49:56 +00001687 Value *Result;
1688 if (Oper->getType()->isFPOrFPVectorTy())
1689 Result = Builder.CreateFCmp(llvm::CmpInst::FCMP_OEQ, Oper, Zero, "cmp");
1690 else
1691 Result = Builder.CreateICmp(llvm::CmpInst::ICMP_EQ, Oper, Zero, "cmp");
Tanya Lattner4f692c22012-01-16 21:02:28 +00001692 return Builder.CreateSExt(Result, ConvertType(E->getType()), "sext");
1693 }
1694
Chris Lattner7f02f722007-08-24 05:35:26 +00001695 // Compare operand to zero.
1696 Value *BoolVal = CGF.EvaluateExprAsBool(E->getSubExpr());
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001697
Chris Lattner7f02f722007-08-24 05:35:26 +00001698 // Invert value.
1699 // TODO: Could dynamically modify easy computations here. For example, if
1700 // the operand is an icmp ne, turn into icmp eq.
1701 BoolVal = Builder.CreateNot(BoolVal, "lnot");
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001702
Anders Carlsson9f84d882009-05-19 18:44:53 +00001703 // ZExt result to the expr type.
1704 return Builder.CreateZExt(BoolVal, ConvertType(E->getType()), "lnot.ext");
Chris Lattner7f02f722007-08-24 05:35:26 +00001705}
1706
Eli Friedman0027d2b2010-08-05 09:58:49 +00001707Value *ScalarExprEmitter::VisitOffsetOfExpr(OffsetOfExpr *E) {
1708 // Try folding the offsetof to a constant.
Richard Smith80d4b552011-12-28 19:48:30 +00001709 llvm::APSInt Value;
1710 if (E->EvaluateAsInt(Value, CGF.getContext()))
1711 return Builder.getInt(Value);
Eli Friedman0027d2b2010-08-05 09:58:49 +00001712
1713 // Loop over the components of the offsetof to compute the value.
1714 unsigned n = E->getNumComponents();
Chris Lattner2acc6e32011-07-18 04:24:23 +00001715 llvm::Type* ResultType = ConvertType(E->getType());
Eli Friedman0027d2b2010-08-05 09:58:49 +00001716 llvm::Value* Result = llvm::Constant::getNullValue(ResultType);
1717 QualType CurrentType = E->getTypeSourceInfo()->getType();
1718 for (unsigned i = 0; i != n; ++i) {
1719 OffsetOfExpr::OffsetOfNode ON = E->getComponent(i);
Eli Friedman16fd39f2010-08-06 16:37:05 +00001720 llvm::Value *Offset = 0;
Eli Friedman0027d2b2010-08-05 09:58:49 +00001721 switch (ON.getKind()) {
1722 case OffsetOfExpr::OffsetOfNode::Array: {
1723 // Compute the index
1724 Expr *IdxExpr = E->getIndexExpr(ON.getArrayExprIndex());
1725 llvm::Value* Idx = CGF.EmitScalarExpr(IdxExpr);
Douglas Gregor575a1c92011-05-20 16:38:50 +00001726 bool IdxSigned = IdxExpr->getType()->isSignedIntegerOrEnumerationType();
Eli Friedman0027d2b2010-08-05 09:58:49 +00001727 Idx = Builder.CreateIntCast(Idx, ResultType, IdxSigned, "conv");
1728
1729 // Save the element type
1730 CurrentType =
1731 CGF.getContext().getAsArrayType(CurrentType)->getElementType();
1732
1733 // Compute the element size
1734 llvm::Value* ElemSize = llvm::ConstantInt::get(ResultType,
1735 CGF.getContext().getTypeSizeInChars(CurrentType).getQuantity());
1736
1737 // Multiply out to compute the result
1738 Offset = Builder.CreateMul(Idx, ElemSize);
1739 break;
1740 }
1741
1742 case OffsetOfExpr::OffsetOfNode::Field: {
1743 FieldDecl *MemberDecl = ON.getField();
1744 RecordDecl *RD = CurrentType->getAs<RecordType>()->getDecl();
1745 const ASTRecordLayout &RL = CGF.getContext().getASTRecordLayout(RD);
1746
1747 // Compute the index of the field in its parent.
1748 unsigned i = 0;
1749 // FIXME: It would be nice if we didn't have to loop here!
1750 for (RecordDecl::field_iterator Field = RD->field_begin(),
1751 FieldEnd = RD->field_end();
David Blaikie262bc182012-04-30 02:36:29 +00001752 Field != FieldEnd; ++Field, ++i) {
David Blaikie581deb32012-06-06 20:45:41 +00001753 if (*Field == MemberDecl)
Eli Friedman0027d2b2010-08-05 09:58:49 +00001754 break;
1755 }
1756 assert(i < RL.getFieldCount() && "offsetof field in wrong type");
1757
1758 // Compute the offset to the field
1759 int64_t OffsetInt = RL.getFieldOffset(i) /
1760 CGF.getContext().getCharWidth();
1761 Offset = llvm::ConstantInt::get(ResultType, OffsetInt);
1762
1763 // Save the element type.
1764 CurrentType = MemberDecl->getType();
1765 break;
1766 }
Eli Friedman16fd39f2010-08-06 16:37:05 +00001767
Eli Friedman0027d2b2010-08-05 09:58:49 +00001768 case OffsetOfExpr::OffsetOfNode::Identifier:
Eli Friedman6d4e44b2010-08-06 01:17:25 +00001769 llvm_unreachable("dependent __builtin_offsetof");
Eli Friedman16fd39f2010-08-06 16:37:05 +00001770
Eli Friedman0027d2b2010-08-05 09:58:49 +00001771 case OffsetOfExpr::OffsetOfNode::Base: {
1772 if (ON.getBase()->isVirtual()) {
1773 CGF.ErrorUnsupported(E, "virtual base in offsetof");
1774 continue;
1775 }
1776
1777 RecordDecl *RD = CurrentType->getAs<RecordType>()->getDecl();
1778 const ASTRecordLayout &RL = CGF.getContext().getASTRecordLayout(RD);
1779
1780 // Save the element type.
1781 CurrentType = ON.getBase()->getType();
1782
1783 // Compute the offset to the base.
1784 const RecordType *BaseRT = CurrentType->getAs<RecordType>();
1785 CXXRecordDecl *BaseRD = cast<CXXRecordDecl>(BaseRT->getDecl());
Benjamin Kramerd4f51982012-07-04 18:45:14 +00001786 CharUnits OffsetInt = RL.getBaseClassOffset(BaseRD);
1787 Offset = llvm::ConstantInt::get(ResultType, OffsetInt.getQuantity());
Eli Friedman0027d2b2010-08-05 09:58:49 +00001788 break;
1789 }
1790 }
1791 Result = Builder.CreateAdd(Result, Offset);
1792 }
1793 return Result;
Douglas Gregor8ecdb652010-04-28 22:16:22 +00001794}
1795
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00001796/// VisitUnaryExprOrTypeTraitExpr - Return the size or alignment of the type of
Sebastian Redl05189992008-11-11 17:56:53 +00001797/// argument of the sizeof expression as an integer.
1798Value *
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00001799ScalarExprEmitter::VisitUnaryExprOrTypeTraitExpr(
1800 const UnaryExprOrTypeTraitExpr *E) {
Sebastian Redl05189992008-11-11 17:56:53 +00001801 QualType TypeToSize = E->getTypeOfArgument();
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00001802 if (E->getKind() == UETT_SizeOf) {
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001803 if (const VariableArrayType *VAT =
Eli Friedmanf2da9df2009-01-24 22:19:05 +00001804 CGF.getContext().getAsVariableArrayType(TypeToSize)) {
1805 if (E->isArgumentType()) {
1806 // sizeof(type) - make sure to emit the VLA size.
John McCallbc8d40d2011-06-24 21:55:10 +00001807 CGF.EmitVariablyModifiedType(TypeToSize);
Eli Friedman8f426fa2009-04-20 03:21:44 +00001808 } else {
1809 // C99 6.5.3.4p2: If the argument is an expression of type
1810 // VLA, it is evaluated.
John McCall2a416372010-12-05 02:00:02 +00001811 CGF.EmitIgnoredExpr(E->getArgumentExpr());
Eli Friedmanf2da9df2009-01-24 22:19:05 +00001812 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001813
John McCallbc8d40d2011-06-24 21:55:10 +00001814 QualType eltType;
1815 llvm::Value *numElts;
1816 llvm::tie(numElts, eltType) = CGF.getVLASize(VAT);
1817
1818 llvm::Value *size = numElts;
1819
1820 // Scale the number of non-VLA elements by the non-VLA element size.
1821 CharUnits eltSize = CGF.getContext().getTypeSizeInChars(eltType);
1822 if (!eltSize.isOne())
1823 size = CGF.Builder.CreateNUWMul(CGF.CGM.getSize(eltSize), numElts);
1824
1825 return size;
Anders Carlssonb50525b2008-12-21 03:33:21 +00001826 }
Anders Carlsson5d463152008-12-12 07:38:43 +00001827 }
Eli Friedmanf2da9df2009-01-24 22:19:05 +00001828
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001829 // If this isn't sizeof(vla), the result must be constant; use the constant
1830 // folding logic so we don't have to duplicate it here.
Richard Smith80d4b552011-12-28 19:48:30 +00001831 return Builder.getInt(E->EvaluateKnownConstInt(CGF.getContext()));
Chris Lattner7f02f722007-08-24 05:35:26 +00001832}
1833
Chris Lattner46f93d02007-08-24 21:20:17 +00001834Value *ScalarExprEmitter::VisitUnaryReal(const UnaryOperator *E) {
1835 Expr *Op = E->getSubExpr();
John McCallb418d742010-11-16 10:08:07 +00001836 if (Op->getType()->isAnyComplexType()) {
1837 // If it's an l-value, load through the appropriate subobject l-value.
1838 // Note that we have to ask E because Op might be an l-value that
1839 // this won't work for, e.g. an Obj-C property.
John McCall7eb0a9e2010-11-24 05:12:34 +00001840 if (E->isGLValue())
John McCall545d9962011-06-25 02:11:03 +00001841 return CGF.EmitLoadOfLValue(CGF.EmitLValue(E)).getScalarVal();
John McCallb418d742010-11-16 10:08:07 +00001842
1843 // Otherwise, calculate and project.
1844 return CGF.EmitComplexExpr(Op, false, true).first;
1845 }
1846
Chris Lattner46f93d02007-08-24 21:20:17 +00001847 return Visit(Op);
1848}
John McCallb418d742010-11-16 10:08:07 +00001849
Chris Lattner46f93d02007-08-24 21:20:17 +00001850Value *ScalarExprEmitter::VisitUnaryImag(const UnaryOperator *E) {
1851 Expr *Op = E->getSubExpr();
John McCallb418d742010-11-16 10:08:07 +00001852 if (Op->getType()->isAnyComplexType()) {
1853 // If it's an l-value, load through the appropriate subobject l-value.
1854 // Note that we have to ask E because Op might be an l-value that
1855 // this won't work for, e.g. an Obj-C property.
John McCall7eb0a9e2010-11-24 05:12:34 +00001856 if (Op->isGLValue())
John McCall545d9962011-06-25 02:11:03 +00001857 return CGF.EmitLoadOfLValue(CGF.EmitLValue(E)).getScalarVal();
John McCallb418d742010-11-16 10:08:07 +00001858
1859 // Otherwise, calculate and project.
1860 return CGF.EmitComplexExpr(Op, true, false).second;
1861 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001862
Mike Stump7f79f9b2009-05-29 15:46:01 +00001863 // __imag on a scalar returns zero. Emit the subexpr to ensure side
1864 // effects are evaluated, but not the actual value.
Richard Smithdfb80de2012-02-18 20:53:32 +00001865 if (Op->isGLValue())
1866 CGF.EmitLValue(Op);
1867 else
1868 CGF.EmitScalarExpr(Op, true);
Owen Andersonc9c88b42009-07-31 20:28:54 +00001869 return llvm::Constant::getNullValue(ConvertType(E->getType()));
Chris Lattner46f93d02007-08-24 21:20:17 +00001870}
1871
Chris Lattner7f02f722007-08-24 05:35:26 +00001872//===----------------------------------------------------------------------===//
1873// Binary Operators
1874//===----------------------------------------------------------------------===//
1875
1876BinOpInfo ScalarExprEmitter::EmitBinOps(const BinaryOperator *E) {
Mike Stump7f79f9b2009-05-29 15:46:01 +00001877 TestAndClearIgnoreResultAssign();
Chris Lattner7f02f722007-08-24 05:35:26 +00001878 BinOpInfo Result;
1879 Result.LHS = Visit(E->getLHS());
1880 Result.RHS = Visit(E->getRHS());
Chris Lattner1f1ded92007-08-24 21:00:35 +00001881 Result.Ty = E->getType();
Chris Lattner9a207232010-06-26 21:48:21 +00001882 Result.Opcode = E->getOpcode();
Lang Hamesbe9af122012-10-02 04:45:10 +00001883 Result.FPContractable = E->isFPContractable();
Chris Lattner7f02f722007-08-24 05:35:26 +00001884 Result.E = E;
1885 return Result;
1886}
1887
Douglas Gregor6a03e342010-04-23 04:16:32 +00001888LValue ScalarExprEmitter::EmitCompoundAssignLValue(
1889 const CompoundAssignOperator *E,
1890 Value *(ScalarExprEmitter::*Func)(const BinOpInfo &),
Daniel Dunbard7f7d082010-06-29 22:00:45 +00001891 Value *&Result) {
Benjamin Kramer54d76db2009-12-25 15:43:36 +00001892 QualType LHSTy = E->getLHS()->getType();
Chris Lattner1f1ded92007-08-24 21:00:35 +00001893 BinOpInfo OpInfo;
Douglas Gregor6a03e342010-04-23 04:16:32 +00001894
Eli Friedmanab3a8522009-03-28 01:22:36 +00001895 if (E->getComputationResultType()->isAnyComplexType()) {
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001896 // This needs to go through the complex expression emitter, but it's a tad
1897 // complicated to do that... I'm leaving it out for now. (Note that we do
1898 // actually need the imaginary part of the RHS for multiplication and
1899 // division.)
Eli Friedmanab3a8522009-03-28 01:22:36 +00001900 CGF.ErrorUnsupported(E, "complex compound assignment");
Daniel Dunbard7f7d082010-06-29 22:00:45 +00001901 Result = llvm::UndefValue::get(CGF.ConvertType(E->getType()));
Douglas Gregor6a03e342010-04-23 04:16:32 +00001902 return LValue();
Eli Friedmanab3a8522009-03-28 01:22:36 +00001903 }
Douglas Gregor6a03e342010-04-23 04:16:32 +00001904
Mike Stumpcc0442f2009-05-22 19:07:20 +00001905 // Emit the RHS first. __block variables need to have the rhs evaluated
1906 // first, plus this should improve codegen a little.
1907 OpInfo.RHS = Visit(E->getRHS());
1908 OpInfo.Ty = E->getComputationResultType();
Chris Lattner9a207232010-06-26 21:48:21 +00001909 OpInfo.Opcode = E->getOpcode();
Benjamin Kramerddc57332012-10-03 20:58:04 +00001910 OpInfo.FPContractable = false;
Mike Stumpcc0442f2009-05-22 19:07:20 +00001911 OpInfo.E = E;
Eli Friedmanab3a8522009-03-28 01:22:36 +00001912 // Load/convert the LHS.
Richard Smith7ac9ef12012-09-08 02:08:36 +00001913 LValue LHSLV = EmitCheckedLValue(E->getLHS(), CodeGenFunction::TCK_Store);
David Chisnall7a7ee302012-01-16 17:27:18 +00001914
1915 llvm::PHINode *atomicPHI = 0;
David Chisnall72c1dba2013-03-03 16:02:42 +00001916 if (const AtomicType *atomicTy = LHSTy->getAs<AtomicType>()) {
1917 QualType type = atomicTy->getValueType();
1918 if (!type->isBooleanType() && type->isIntegerType() &&
1919 !(type->isUnsignedIntegerType() &&
1920 CGF.SanOpts->UnsignedIntegerOverflow) &&
1921 CGF.getLangOpts().getSignedOverflowBehavior() !=
1922 LangOptions::SOB_Trapping) {
1923 llvm::AtomicRMWInst::BinOp aop = llvm::AtomicRMWInst::BAD_BINOP;
1924 switch (OpInfo.Opcode) {
1925 // We don't have atomicrmw operands for *, %, /, <<, >>
1926 case BO_MulAssign: case BO_DivAssign:
1927 case BO_RemAssign:
1928 case BO_ShlAssign:
1929 case BO_ShrAssign:
1930 break;
1931 case BO_AddAssign:
1932 aop = llvm::AtomicRMWInst::Add;
1933 break;
1934 case BO_SubAssign:
1935 aop = llvm::AtomicRMWInst::Sub;
1936 break;
1937 case BO_AndAssign:
1938 aop = llvm::AtomicRMWInst::And;
1939 break;
1940 case BO_XorAssign:
1941 aop = llvm::AtomicRMWInst::Xor;
1942 break;
1943 case BO_OrAssign:
1944 aop = llvm::AtomicRMWInst::Or;
1945 break;
1946 default:
1947 llvm_unreachable("Invalid compound assignment type");
1948 }
1949 if (aop != llvm::AtomicRMWInst::BAD_BINOP) {
1950 llvm::Value *amt = CGF.EmitToMemory(EmitScalarConversion(OpInfo.RHS,
1951 E->getRHS()->getType(), LHSTy), LHSTy);
1952 Builder.CreateAtomicRMW(aop, LHSLV.getAddress(), amt,
1953 llvm::SequentiallyConsistent);
1954 return LHSLV;
1955 }
1956 }
David Chisnall7a7ee302012-01-16 17:27:18 +00001957 // FIXME: For floating point types, we should be saving and restoring the
1958 // floating point environment in the loop.
1959 llvm::BasicBlock *startBB = Builder.GetInsertBlock();
1960 llvm::BasicBlock *opBB = CGF.createBasicBlock("atomic_op", CGF.CurFn);
David Chisnall72c1dba2013-03-03 16:02:42 +00001961 OpInfo.LHS = EmitLoadOfLValue(LHSLV);
1962 OpInfo.LHS = CGF.EmitToMemory(OpInfo.LHS, type);
David Chisnall7a7ee302012-01-16 17:27:18 +00001963 Builder.CreateBr(opBB);
1964 Builder.SetInsertPoint(opBB);
1965 atomicPHI = Builder.CreatePHI(OpInfo.LHS->getType(), 2);
1966 atomicPHI->addIncoming(OpInfo.LHS, startBB);
David Chisnall7a7ee302012-01-16 17:27:18 +00001967 OpInfo.LHS = atomicPHI;
1968 }
David Chisnall72c1dba2013-03-03 16:02:42 +00001969 else
1970 OpInfo.LHS = EmitLoadOfLValue(LHSLV);
Eli Friedman860a3192012-06-16 02:19:17 +00001971
1972 OpInfo.LHS = EmitScalarConversion(OpInfo.LHS, LHSTy,
1973 E->getComputationLHSType());
1974
Chris Lattner1f1ded92007-08-24 21:00:35 +00001975 // Expand the binary operator.
Daniel Dunbard7f7d082010-06-29 22:00:45 +00001976 Result = (this->*Func)(OpInfo);
Douglas Gregor6a03e342010-04-23 04:16:32 +00001977
Daniel Dunbar8c6f57c2008-08-06 02:00:38 +00001978 // Convert the result back to the LHS type.
Eli Friedmanab3a8522009-03-28 01:22:36 +00001979 Result = EmitScalarConversion(Result, E->getComputationResultType(), LHSTy);
David Chisnall7a7ee302012-01-16 17:27:18 +00001980
1981 if (atomicPHI) {
1982 llvm::BasicBlock *opBB = Builder.GetInsertBlock();
1983 llvm::BasicBlock *contBB = CGF.createBasicBlock("atomic_cont", CGF.CurFn);
1984 llvm::Value *old = Builder.CreateAtomicCmpXchg(LHSLV.getAddress(), atomicPHI,
David Chisnall72c1dba2013-03-03 16:02:42 +00001985 CGF.EmitToMemory(Result, LHSTy), llvm::SequentiallyConsistent);
David Chisnall7a7ee302012-01-16 17:27:18 +00001986 atomicPHI->addIncoming(old, opBB);
1987 llvm::Value *success = Builder.CreateICmpEQ(old, atomicPHI);
1988 Builder.CreateCondBr(success, contBB, opBB);
1989 Builder.SetInsertPoint(contBB);
1990 return LHSLV;
1991 }
Douglas Gregor6a03e342010-04-23 04:16:32 +00001992
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001993 // Store the result value into the LHS lvalue. Bit-fields are handled
1994 // specially because the result is altered by the store, i.e., [C99 6.5.16p1]
1995 // 'An assignment expression has the value of the left operand after the
1996 // assignment...'.
Daniel Dunbard7f7d082010-06-29 22:00:45 +00001997 if (LHSLV.isBitField())
John McCall545d9962011-06-25 02:11:03 +00001998 CGF.EmitStoreThroughBitfieldLValue(RValue::get(Result), LHSLV, &Result);
Daniel Dunbard7f7d082010-06-29 22:00:45 +00001999 else
John McCall545d9962011-06-25 02:11:03 +00002000 CGF.EmitStoreThroughLValue(RValue::get(Result), LHSLV);
Daniel Dunbard7f7d082010-06-29 22:00:45 +00002001
Douglas Gregor6a03e342010-04-23 04:16:32 +00002002 return LHSLV;
2003}
2004
2005Value *ScalarExprEmitter::EmitCompoundAssign(const CompoundAssignOperator *E,
2006 Value *(ScalarExprEmitter::*Func)(const BinOpInfo &)) {
2007 bool Ignore = TestAndClearIgnoreResultAssign();
Daniel Dunbard7f7d082010-06-29 22:00:45 +00002008 Value *RHS;
2009 LValue LHS = EmitCompoundAssignLValue(E, Func, RHS);
2010
2011 // If the result is clearly ignored, return now.
Mike Stump7f79f9b2009-05-29 15:46:01 +00002012 if (Ignore)
2013 return 0;
Daniel Dunbard7f7d082010-06-29 22:00:45 +00002014
John McCallb418d742010-11-16 10:08:07 +00002015 // The result of an assignment in C is the assigned r-value.
Richard Smith7edf9e32012-11-01 22:30:59 +00002016 if (!CGF.getLangOpts().CPlusPlus)
John McCallb418d742010-11-16 10:08:07 +00002017 return RHS;
2018
Daniel Dunbard7f7d082010-06-29 22:00:45 +00002019 // If the lvalue is non-volatile, return the computed value of the assignment.
2020 if (!LHS.isVolatileQualified())
2021 return RHS;
2022
2023 // Otherwise, reload the value.
John McCall545d9962011-06-25 02:11:03 +00002024 return EmitLoadOfLValue(LHS);
Chris Lattner1f1ded92007-08-24 21:00:35 +00002025}
2026
Chris Lattner80230302010-09-11 21:47:09 +00002027void ScalarExprEmitter::EmitUndefinedBehaviorIntegerDivAndRemCheck(
Richard Smith7ac9ef12012-09-08 02:08:36 +00002028 const BinOpInfo &Ops, llvm::Value *Zero, bool isDiv) {
Richard Smithc54e25f2012-11-06 02:30:30 +00002029 llvm::Value *Cond = 0;
Chris Lattner80230302010-09-11 21:47:09 +00002030
Will Dietz4f45bc02013-01-18 11:30:38 +00002031 if (CGF.SanOpts->IntegerDivideByZero)
Richard Smithc54e25f2012-11-06 02:30:30 +00002032 Cond = Builder.CreateICmpNE(Ops.RHS, Zero);
2033
Will Dietz4f45bc02013-01-18 11:30:38 +00002034 if (CGF.SanOpts->SignedIntegerOverflow &&
Richard Smithc54e25f2012-11-06 02:30:30 +00002035 Ops.Ty->hasSignedIntegerRepresentation()) {
2036 llvm::IntegerType *Ty = cast<llvm::IntegerType>(Zero->getType());
2037
Chris Lattner80230302010-09-11 21:47:09 +00002038 llvm::Value *IntMin =
Chris Lattner48431f92011-04-19 22:55:03 +00002039 Builder.getInt(llvm::APInt::getSignedMinValue(Ty->getBitWidth()));
Chris Lattner80230302010-09-11 21:47:09 +00002040 llvm::Value *NegOne = llvm::ConstantInt::get(Ty, -1ULL);
2041
Richard Smith7ac9ef12012-09-08 02:08:36 +00002042 llvm::Value *LHSCmp = Builder.CreateICmpNE(Ops.LHS, IntMin);
2043 llvm::Value *RHSCmp = Builder.CreateICmpNE(Ops.RHS, NegOne);
Richard Smithc54e25f2012-11-06 02:30:30 +00002044 llvm::Value *Overflow = Builder.CreateOr(LHSCmp, RHSCmp, "or");
2045 Cond = Cond ? Builder.CreateAnd(Cond, Overflow, "and") : Overflow;
Chris Lattner80230302010-09-11 21:47:09 +00002046 }
Richard Smithc54e25f2012-11-06 02:30:30 +00002047
2048 if (Cond)
2049 EmitBinOpCheck(Cond, Ops);
Chris Lattner80230302010-09-11 21:47:09 +00002050}
Chris Lattner1f1ded92007-08-24 21:00:35 +00002051
Chris Lattner7f02f722007-08-24 05:35:26 +00002052Value *ScalarExprEmitter::EmitDiv(const BinOpInfo &Ops) {
Will Dietz4f45bc02013-01-18 11:30:38 +00002053 if ((CGF.SanOpts->IntegerDivideByZero ||
2054 CGF.SanOpts->SignedIntegerOverflow) &&
Will Dietzb8540362012-11-27 15:01:55 +00002055 Ops.Ty->isIntegerType()) {
Chris Lattner80230302010-09-11 21:47:09 +00002056 llvm::Value *Zero = llvm::Constant::getNullValue(ConvertType(Ops.Ty));
Will Dietzb8540362012-11-27 15:01:55 +00002057 EmitUndefinedBehaviorIntegerDivAndRemCheck(Ops, Zero, true);
Will Dietz4f45bc02013-01-18 11:30:38 +00002058 } else if (CGF.SanOpts->FloatDivideByZero &&
Will Dietzb8540362012-11-27 15:01:55 +00002059 Ops.Ty->isRealFloatingType()) {
2060 llvm::Value *Zero = llvm::Constant::getNullValue(ConvertType(Ops.Ty));
2061 EmitBinOpCheck(Builder.CreateFCmpUNE(Ops.RHS, Zero), Ops);
Chris Lattner80230302010-09-11 21:47:09 +00002062 }
Will Dietzb8540362012-11-27 15:01:55 +00002063
Peter Collingbournec5096cb2011-10-27 19:19:51 +00002064 if (Ops.LHS->getType()->isFPOrFPVectorTy()) {
2065 llvm::Value *Val = Builder.CreateFDiv(Ops.LHS, Ops.RHS, "div");
Richard Smith7edf9e32012-11-01 22:30:59 +00002066 if (CGF.getLangOpts().OpenCL) {
Peter Collingbournec5096cb2011-10-27 19:19:51 +00002067 // OpenCL 1.1 7.4: minimum accuracy of single precision / is 2.5ulp
2068 llvm::Type *ValTy = Val->getType();
2069 if (ValTy->isFloatTy() ||
2070 (isa<llvm::VectorType>(ValTy) &&
2071 cast<llvm::VectorType>(ValTy)->getElementType()->isFloatTy()))
Duncan Sands82500162012-04-10 08:23:07 +00002072 CGF.SetFPAccuracy(Val, 2.5);
Peter Collingbournec5096cb2011-10-27 19:19:51 +00002073 }
2074 return Val;
2075 }
Douglas Gregorf6094622010-07-23 15:58:24 +00002076 else if (Ops.Ty->hasUnsignedIntegerRepresentation())
Chris Lattner7f02f722007-08-24 05:35:26 +00002077 return Builder.CreateUDiv(Ops.LHS, Ops.RHS, "div");
2078 else
2079 return Builder.CreateSDiv(Ops.LHS, Ops.RHS, "div");
2080}
2081
2082Value *ScalarExprEmitter::EmitRem(const BinOpInfo &Ops) {
2083 // Rem in C can't be a floating point type: C99 6.5.5p2.
Will Dietz4f45bc02013-01-18 11:30:38 +00002084 if (CGF.SanOpts->IntegerDivideByZero) {
Chris Lattner80230302010-09-11 21:47:09 +00002085 llvm::Value *Zero = llvm::Constant::getNullValue(ConvertType(Ops.Ty));
2086
Will Dietzb8540362012-11-27 15:01:55 +00002087 if (Ops.Ty->isIntegerType())
Chris Lattner80230302010-09-11 21:47:09 +00002088 EmitUndefinedBehaviorIntegerDivAndRemCheck(Ops, Zero, false);
2089 }
2090
Eli Friedman52d68742011-04-10 04:44:11 +00002091 if (Ops.Ty->hasUnsignedIntegerRepresentation())
Chris Lattner7f02f722007-08-24 05:35:26 +00002092 return Builder.CreateURem(Ops.LHS, Ops.RHS, "rem");
2093 else
2094 return Builder.CreateSRem(Ops.LHS, Ops.RHS, "rem");
2095}
2096
Mike Stump2add4732009-04-01 20:28:16 +00002097Value *ScalarExprEmitter::EmitOverflowCheckedBinOp(const BinOpInfo &Ops) {
2098 unsigned IID;
2099 unsigned OpID = 0;
Mike Stump5d8b2cf2009-04-02 01:03:55 +00002100
Will Dietzb8540362012-11-27 15:01:55 +00002101 bool isSigned = Ops.Ty->isSignedIntegerOrEnumerationType();
Chris Lattner9a207232010-06-26 21:48:21 +00002102 switch (Ops.Opcode) {
John McCall2de56d12010-08-25 11:45:40 +00002103 case BO_Add:
2104 case BO_AddAssign:
Mike Stump035cf892009-04-02 18:15:54 +00002105 OpID = 1;
Will Dietzb8540362012-11-27 15:01:55 +00002106 IID = isSigned ? llvm::Intrinsic::sadd_with_overflow :
2107 llvm::Intrinsic::uadd_with_overflow;
Mike Stump035cf892009-04-02 18:15:54 +00002108 break;
John McCall2de56d12010-08-25 11:45:40 +00002109 case BO_Sub:
2110 case BO_SubAssign:
Mike Stump035cf892009-04-02 18:15:54 +00002111 OpID = 2;
Will Dietzb8540362012-11-27 15:01:55 +00002112 IID = isSigned ? llvm::Intrinsic::ssub_with_overflow :
2113 llvm::Intrinsic::usub_with_overflow;
Mike Stump035cf892009-04-02 18:15:54 +00002114 break;
John McCall2de56d12010-08-25 11:45:40 +00002115 case BO_Mul:
2116 case BO_MulAssign:
Mike Stump035cf892009-04-02 18:15:54 +00002117 OpID = 3;
Will Dietzb8540362012-11-27 15:01:55 +00002118 IID = isSigned ? llvm::Intrinsic::smul_with_overflow :
2119 llvm::Intrinsic::umul_with_overflow;
Mike Stump035cf892009-04-02 18:15:54 +00002120 break;
2121 default:
David Blaikieb219cfc2011-09-23 05:06:16 +00002122 llvm_unreachable("Unsupported operation for overflow detection");
Mike Stump2add4732009-04-01 20:28:16 +00002123 }
Mike Stump035cf892009-04-02 18:15:54 +00002124 OpID <<= 1;
Will Dietzb8540362012-11-27 15:01:55 +00002125 if (isSigned)
2126 OpID |= 1;
Mike Stump035cf892009-04-02 18:15:54 +00002127
Chris Lattner9cbe4f02011-07-09 17:41:47 +00002128 llvm::Type *opTy = CGF.CGM.getTypes().ConvertType(Ops.Ty);
Mike Stump2add4732009-04-01 20:28:16 +00002129
Benjamin Kramer8dd55a32011-07-14 17:45:50 +00002130 llvm::Function *intrinsic = CGF.CGM.getIntrinsic(IID, opTy);
Mike Stump2add4732009-04-01 20:28:16 +00002131
2132 Value *resultAndOverflow = Builder.CreateCall2(intrinsic, Ops.LHS, Ops.RHS);
2133 Value *result = Builder.CreateExtractValue(resultAndOverflow, 0);
2134 Value *overflow = Builder.CreateExtractValue(resultAndOverflow, 1);
2135
Richard Smith7ac9ef12012-09-08 02:08:36 +00002136 // Handle overflow with llvm.trap if no custom handler has been specified.
2137 const std::string *handlerName =
Richard Smith7edf9e32012-11-01 22:30:59 +00002138 &CGF.getLangOpts().OverflowHandler;
Richard Smith7ac9ef12012-09-08 02:08:36 +00002139 if (handlerName->empty()) {
Richard Smithd6396a62012-11-05 22:21:05 +00002140 // If the signed-integer-overflow sanitizer is enabled, emit a call to its
Richard Smithcc305612012-11-01 22:15:34 +00002141 // runtime. Otherwise, this is a -ftrapv check, so just emit a trap.
Will Dietz4f45bc02013-01-18 11:30:38 +00002142 if (!isSigned || CGF.SanOpts->SignedIntegerOverflow)
Richard Smithcc305612012-11-01 22:15:34 +00002143 EmitBinOpCheck(Builder.CreateNot(overflow), Ops);
2144 else
Chad Rosier78d85b12013-01-29 23:31:22 +00002145 CGF.EmitTrapCheck(Builder.CreateNot(overflow));
Richard Smith7ac9ef12012-09-08 02:08:36 +00002146 return result;
2147 }
2148
Mike Stump2add4732009-04-01 20:28:16 +00002149 // Branch in case of overflow.
David Chisnall7f18e672010-09-17 18:29:54 +00002150 llvm::BasicBlock *initialBB = Builder.GetInsertBlock();
Bill Wendling14ef3192011-07-07 21:13:10 +00002151 llvm::Function::iterator insertPt = initialBB;
2152 llvm::BasicBlock *continueBB = CGF.createBasicBlock("nooverflow", CGF.CurFn,
2153 llvm::next(insertPt));
Chris Lattner93a00352010-08-07 00:20:46 +00002154 llvm::BasicBlock *overflowBB = CGF.createBasicBlock("overflow", CGF.CurFn);
Mike Stump2add4732009-04-01 20:28:16 +00002155
2156 Builder.CreateCondBr(overflow, overflowBB, continueBB);
2157
David Chisnall7f18e672010-09-17 18:29:54 +00002158 // If an overflow handler is set, then we want to call it and then use its
2159 // result, if it returns.
2160 Builder.SetInsertPoint(overflowBB);
2161
2162 // Get the overflow handler.
Chris Lattner8b418682012-02-07 00:39:47 +00002163 llvm::Type *Int8Ty = CGF.Int8Ty;
Chris Lattner9cbe4f02011-07-09 17:41:47 +00002164 llvm::Type *argTypes[] = { CGF.Int64Ty, CGF.Int64Ty, Int8Ty, Int8Ty };
David Chisnall7f18e672010-09-17 18:29:54 +00002165 llvm::FunctionType *handlerTy =
2166 llvm::FunctionType::get(CGF.Int64Ty, argTypes, true);
2167 llvm::Value *handler = CGF.CGM.CreateRuntimeFunction(handlerTy, *handlerName);
2168
2169 // Sign extend the args to 64-bit, so that we can use the same handler for
2170 // all types of overflow.
2171 llvm::Value *lhs = Builder.CreateSExt(Ops.LHS, CGF.Int64Ty);
2172 llvm::Value *rhs = Builder.CreateSExt(Ops.RHS, CGF.Int64Ty);
2173
2174 // Call the handler with the two arguments, the operation, and the size of
2175 // the result.
John McCallbd7370a2013-02-28 19:01:20 +00002176 llvm::Value *handlerArgs[] = {
2177 lhs,
2178 rhs,
2179 Builder.getInt8(OpID),
2180 Builder.getInt8(cast<llvm::IntegerType>(opTy)->getBitWidth())
2181 };
2182 llvm::Value *handlerResult =
2183 CGF.EmitNounwindRuntimeCall(handler, handlerArgs);
David Chisnall7f18e672010-09-17 18:29:54 +00002184
2185 // Truncate the result back to the desired size.
2186 handlerResult = Builder.CreateTrunc(handlerResult, opTy);
2187 Builder.CreateBr(continueBB);
2188
Mike Stump2add4732009-04-01 20:28:16 +00002189 Builder.SetInsertPoint(continueBB);
Jay Foadbbf3bac2011-03-30 11:28:58 +00002190 llvm::PHINode *phi = Builder.CreatePHI(opTy, 2);
David Chisnall7f18e672010-09-17 18:29:54 +00002191 phi->addIncoming(result, initialBB);
2192 phi->addIncoming(handlerResult, overflowBB);
2193
2194 return phi;
Mike Stump2add4732009-04-01 20:28:16 +00002195}
Chris Lattner7f02f722007-08-24 05:35:26 +00002196
John McCall913dab22011-06-25 01:32:37 +00002197/// Emit pointer + index arithmetic.
2198static Value *emitPointerArithmetic(CodeGenFunction &CGF,
2199 const BinOpInfo &op,
2200 bool isSubtraction) {
2201 // Must have binary (not unary) expr here. Unary pointer
2202 // increment/decrement doesn't use this path.
2203 const BinaryOperator *expr = cast<BinaryOperator>(op.E);
2204
2205 Value *pointer = op.LHS;
2206 Expr *pointerOperand = expr->getLHS();
2207 Value *index = op.RHS;
2208 Expr *indexOperand = expr->getRHS();
2209
2210 // In a subtraction, the LHS is always the pointer.
2211 if (!isSubtraction && !pointer->getType()->isPointerTy()) {
2212 std::swap(pointer, index);
2213 std::swap(pointerOperand, indexOperand);
2214 }
2215
2216 unsigned width = cast<llvm::IntegerType>(index->getType())->getBitWidth();
2217 if (width != CGF.PointerWidthInBits) {
2218 // Zero-extend or sign-extend the pointer value according to
2219 // whether the index is signed or not.
2220 bool isSigned = indexOperand->getType()->isSignedIntegerOrEnumerationType();
2221 index = CGF.Builder.CreateIntCast(index, CGF.PtrDiffTy, isSigned,
2222 "idx.ext");
2223 }
2224
2225 // If this is subtraction, negate the index.
2226 if (isSubtraction)
2227 index = CGF.Builder.CreateNeg(index, "idx.neg");
2228
Richard Smitha0a628f2013-02-23 02:53:19 +00002229 if (CGF.SanOpts->Bounds)
2230 CGF.EmitBoundsCheck(op.E, pointerOperand, index, indexOperand->getType(),
2231 /*Accessed*/ false);
2232
John McCall913dab22011-06-25 01:32:37 +00002233 const PointerType *pointerType
2234 = pointerOperand->getType()->getAs<PointerType>();
2235 if (!pointerType) {
2236 QualType objectType = pointerOperand->getType()
2237 ->castAs<ObjCObjectPointerType>()
2238 ->getPointeeType();
2239 llvm::Value *objectSize
2240 = CGF.CGM.getSize(CGF.getContext().getTypeSizeInChars(objectType));
2241
2242 index = CGF.Builder.CreateMul(index, objectSize);
2243
2244 Value *result = CGF.Builder.CreateBitCast(pointer, CGF.VoidPtrTy);
2245 result = CGF.Builder.CreateGEP(result, index, "add.ptr");
2246 return CGF.Builder.CreateBitCast(result, pointer->getType());
2247 }
2248
2249 QualType elementType = pointerType->getPointeeType();
2250 if (const VariableArrayType *vla
2251 = CGF.getContext().getAsVariableArrayType(elementType)) {
2252 // The element count here is the total number of non-VLA elements.
2253 llvm::Value *numElements = CGF.getVLASize(vla).first;
2254
2255 // Effectively, the multiply by the VLA size is part of the GEP.
2256 // GEP indexes are signed, and scaling an index isn't permitted to
2257 // signed-overflow, so we use the same semantics for our explicit
2258 // multiply. We suppress this if overflow is not undefined behavior.
David Blaikie4e4d0842012-03-11 07:00:24 +00002259 if (CGF.getLangOpts().isSignedOverflowDefined()) {
John McCall913dab22011-06-25 01:32:37 +00002260 index = CGF.Builder.CreateMul(index, numElements, "vla.index");
2261 pointer = CGF.Builder.CreateGEP(pointer, index, "add.ptr");
2262 } else {
2263 index = CGF.Builder.CreateNSWMul(index, numElements, "vla.index");
2264 pointer = CGF.Builder.CreateInBoundsGEP(pointer, index, "add.ptr");
Chris Lattnera4d71452010-06-26 21:25:03 +00002265 }
John McCall913dab22011-06-25 01:32:37 +00002266 return pointer;
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002267 }
Daniel Dunbar2a866252009-04-25 05:08:32 +00002268
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002269 // Explicitly handle GNU void* and function pointer arithmetic extensions. The
2270 // GNU void* casts amount to no-ops since our void* type is i8*, but this is
2271 // future proof.
John McCall913dab22011-06-25 01:32:37 +00002272 if (elementType->isVoidType() || elementType->isFunctionType()) {
2273 Value *result = CGF.Builder.CreateBitCast(pointer, CGF.VoidPtrTy);
2274 result = CGF.Builder.CreateGEP(result, index, "add.ptr");
2275 return CGF.Builder.CreateBitCast(result, pointer->getType());
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002276 }
2277
David Blaikie4e4d0842012-03-11 07:00:24 +00002278 if (CGF.getLangOpts().isSignedOverflowDefined())
John McCall913dab22011-06-25 01:32:37 +00002279 return CGF.Builder.CreateGEP(pointer, index, "add.ptr");
2280
2281 return CGF.Builder.CreateInBoundsGEP(pointer, index, "add.ptr");
Chris Lattner7f02f722007-08-24 05:35:26 +00002282}
2283
Lang Hamesbe9af122012-10-02 04:45:10 +00002284// Construct an fmuladd intrinsic to represent a fused mul-add of MulOp and
2285// Addend. Use negMul and negAdd to negate the first operand of the Mul or
2286// the add operand respectively. This allows fmuladd to represent a*b-c, or
2287// c-a*b. Patterns in LLVM should catch the negated forms and translate them to
2288// efficient operations.
2289static Value* buildFMulAdd(llvm::BinaryOperator *MulOp, Value *Addend,
2290 const CodeGenFunction &CGF, CGBuilderTy &Builder,
2291 bool negMul, bool negAdd) {
2292 assert(!(negMul && negAdd) && "Only one of negMul and negAdd should be set.");
2293
2294 Value *MulOp0 = MulOp->getOperand(0);
2295 Value *MulOp1 = MulOp->getOperand(1);
2296 if (negMul) {
2297 MulOp0 =
2298 Builder.CreateFSub(
2299 llvm::ConstantFP::getZeroValueForNegation(MulOp0->getType()), MulOp0,
2300 "neg");
2301 } else if (negAdd) {
2302 Addend =
2303 Builder.CreateFSub(
2304 llvm::ConstantFP::getZeroValueForNegation(Addend->getType()), Addend,
2305 "neg");
2306 }
2307
2308 Value *FMulAdd =
2309 Builder.CreateCall3(
2310 CGF.CGM.getIntrinsic(llvm::Intrinsic::fmuladd, Addend->getType()),
2311 MulOp0, MulOp1, Addend);
2312 MulOp->eraseFromParent();
2313
2314 return FMulAdd;
2315}
2316
2317// Check whether it would be legal to emit an fmuladd intrinsic call to
2318// represent op and if so, build the fmuladd.
2319//
2320// Checks that (a) the operation is fusable, and (b) -ffp-contract=on.
2321// Does NOT check the type of the operation - it's assumed that this function
2322// will be called from contexts where it's known that the type is contractable.
2323static Value* tryEmitFMulAdd(const BinOpInfo &op,
2324 const CodeGenFunction &CGF, CGBuilderTy &Builder,
2325 bool isSub=false) {
2326
2327 assert((op.Opcode == BO_Add || op.Opcode == BO_AddAssign ||
2328 op.Opcode == BO_Sub || op.Opcode == BO_SubAssign) &&
2329 "Only fadd/fsub can be the root of an fmuladd.");
2330
2331 // Check whether this op is marked as fusable.
2332 if (!op.FPContractable)
2333 return 0;
2334
2335 // Check whether -ffp-contract=on. (If -ffp-contract=off/fast, fusing is
2336 // either disabled, or handled entirely by the LLVM backend).
Lang Hames931c0832012-11-15 07:51:26 +00002337 if (CGF.CGM.getCodeGenOpts().getFPContractMode() != CodeGenOptions::FPC_On)
Lang Hamesbe9af122012-10-02 04:45:10 +00002338 return 0;
2339
2340 // We have a potentially fusable op. Look for a mul on one of the operands.
2341 if (llvm::BinaryOperator* LHSBinOp = dyn_cast<llvm::BinaryOperator>(op.LHS)) {
2342 if (LHSBinOp->getOpcode() == llvm::Instruction::FMul) {
Lang Hamesff4ae6d2012-10-04 03:23:25 +00002343 assert(LHSBinOp->getNumUses() == 0 &&
2344 "Operations with multiple uses shouldn't be contracted.");
Lang Hamesbe9af122012-10-02 04:45:10 +00002345 return buildFMulAdd(LHSBinOp, op.RHS, CGF, Builder, false, isSub);
2346 }
2347 } else if (llvm::BinaryOperator* RHSBinOp =
2348 dyn_cast<llvm::BinaryOperator>(op.RHS)) {
2349 if (RHSBinOp->getOpcode() == llvm::Instruction::FMul) {
Lang Hamesff4ae6d2012-10-04 03:23:25 +00002350 assert(RHSBinOp->getNumUses() == 0 &&
2351 "Operations with multiple uses shouldn't be contracted.");
Lang Hamesbe9af122012-10-02 04:45:10 +00002352 return buildFMulAdd(RHSBinOp, op.LHS, CGF, Builder, isSub, false);
2353 }
2354 }
2355
2356 return 0;
2357}
2358
John McCall913dab22011-06-25 01:32:37 +00002359Value *ScalarExprEmitter::EmitAdd(const BinOpInfo &op) {
2360 if (op.LHS->getType()->isPointerTy() ||
2361 op.RHS->getType()->isPointerTy())
2362 return emitPointerArithmetic(CGF, op, /*subtraction*/ false);
2363
2364 if (op.Ty->isSignedIntegerOrEnumerationType()) {
Richard Smith7edf9e32012-11-01 22:30:59 +00002365 switch (CGF.getLangOpts().getSignedOverflowBehavior()) {
John McCall913dab22011-06-25 01:32:37 +00002366 case LangOptions::SOB_Defined:
2367 return Builder.CreateAdd(op.LHS, op.RHS, "add");
Richard Smith9d3e2262012-08-25 00:32:28 +00002368 case LangOptions::SOB_Undefined:
Will Dietz4f45bc02013-01-18 11:30:38 +00002369 if (!CGF.SanOpts->SignedIntegerOverflow)
Richard Smith9d3e2262012-08-25 00:32:28 +00002370 return Builder.CreateNSWAdd(op.LHS, op.RHS, "add");
2371 // Fall through.
John McCall913dab22011-06-25 01:32:37 +00002372 case LangOptions::SOB_Trapping:
2373 return EmitOverflowCheckedBinOp(op);
2374 }
2375 }
Will Dietzb8540362012-11-27 15:01:55 +00002376
Will Dietz4f45bc02013-01-18 11:30:38 +00002377 if (op.Ty->isUnsignedIntegerType() && CGF.SanOpts->UnsignedIntegerOverflow)
Will Dietzb8540362012-11-27 15:01:55 +00002378 return EmitOverflowCheckedBinOp(op);
2379
Lang Hamesbe9af122012-10-02 04:45:10 +00002380 if (op.LHS->getType()->isFPOrFPVectorTy()) {
2381 // Try to form an fmuladd.
2382 if (Value *FMulAdd = tryEmitFMulAdd(op, CGF, Builder))
2383 return FMulAdd;
2384
John McCall913dab22011-06-25 01:32:37 +00002385 return Builder.CreateFAdd(op.LHS, op.RHS, "add");
Lang Hamesbe9af122012-10-02 04:45:10 +00002386 }
John McCall913dab22011-06-25 01:32:37 +00002387
2388 return Builder.CreateAdd(op.LHS, op.RHS, "add");
2389}
2390
2391Value *ScalarExprEmitter::EmitSub(const BinOpInfo &op) {
2392 // The LHS is always a pointer if either side is.
2393 if (!op.LHS->getType()->isPointerTy()) {
2394 if (op.Ty->isSignedIntegerOrEnumerationType()) {
Richard Smith7edf9e32012-11-01 22:30:59 +00002395 switch (CGF.getLangOpts().getSignedOverflowBehavior()) {
Chris Lattnera4d71452010-06-26 21:25:03 +00002396 case LangOptions::SOB_Defined:
John McCall913dab22011-06-25 01:32:37 +00002397 return Builder.CreateSub(op.LHS, op.RHS, "sub");
Richard Smith9d3e2262012-08-25 00:32:28 +00002398 case LangOptions::SOB_Undefined:
Will Dietz4f45bc02013-01-18 11:30:38 +00002399 if (!CGF.SanOpts->SignedIntegerOverflow)
Richard Smith9d3e2262012-08-25 00:32:28 +00002400 return Builder.CreateNSWSub(op.LHS, op.RHS, "sub");
2401 // Fall through.
Chris Lattnera4d71452010-06-26 21:25:03 +00002402 case LangOptions::SOB_Trapping:
John McCall913dab22011-06-25 01:32:37 +00002403 return EmitOverflowCheckedBinOp(op);
Chris Lattnera4d71452010-06-26 21:25:03 +00002404 }
2405 }
Will Dietzb8540362012-11-27 15:01:55 +00002406
Will Dietz4f45bc02013-01-18 11:30:38 +00002407 if (op.Ty->isUnsignedIntegerType() && CGF.SanOpts->UnsignedIntegerOverflow)
Will Dietzb8540362012-11-27 15:01:55 +00002408 return EmitOverflowCheckedBinOp(op);
2409
Lang Hamesbe9af122012-10-02 04:45:10 +00002410 if (op.LHS->getType()->isFPOrFPVectorTy()) {
2411 // Try to form an fmuladd.
2412 if (Value *FMulAdd = tryEmitFMulAdd(op, CGF, Builder, true))
2413 return FMulAdd;
John McCall913dab22011-06-25 01:32:37 +00002414 return Builder.CreateFSub(op.LHS, op.RHS, "sub");
Lang Hamesbe9af122012-10-02 04:45:10 +00002415 }
Chris Lattner2eb91e42010-03-29 17:28:16 +00002416
John McCall913dab22011-06-25 01:32:37 +00002417 return Builder.CreateSub(op.LHS, op.RHS, "sub");
Mike Stump2add4732009-04-01 20:28:16 +00002418 }
Chris Lattner1f1ded92007-08-24 21:00:35 +00002419
John McCall913dab22011-06-25 01:32:37 +00002420 // If the RHS is not a pointer, then we have normal pointer
2421 // arithmetic.
2422 if (!op.RHS->getType()->isPointerTy())
2423 return emitPointerArithmetic(CGF, op, /*subtraction*/ true);
Eli Friedmandaa24a22009-03-28 02:45:41 +00002424
John McCall913dab22011-06-25 01:32:37 +00002425 // Otherwise, this is a pointer subtraction.
Daniel Dunbarb09fae72009-01-23 18:51:09 +00002426
John McCall913dab22011-06-25 01:32:37 +00002427 // Do the raw subtraction part.
2428 llvm::Value *LHS
2429 = Builder.CreatePtrToInt(op.LHS, CGF.PtrDiffTy, "sub.ptr.lhs.cast");
2430 llvm::Value *RHS
2431 = Builder.CreatePtrToInt(op.RHS, CGF.PtrDiffTy, "sub.ptr.rhs.cast");
2432 Value *diffInChars = Builder.CreateSub(LHS, RHS, "sub.ptr.sub");
Daniel Dunbar2a866252009-04-25 05:08:32 +00002433
John McCall913dab22011-06-25 01:32:37 +00002434 // Okay, figure out the element size.
2435 const BinaryOperator *expr = cast<BinaryOperator>(op.E);
2436 QualType elementType = expr->getLHS()->getType()->getPointeeType();
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002437
John McCall913dab22011-06-25 01:32:37 +00002438 llvm::Value *divisor = 0;
2439
2440 // For a variable-length array, this is going to be non-constant.
2441 if (const VariableArrayType *vla
2442 = CGF.getContext().getAsVariableArrayType(elementType)) {
2443 llvm::Value *numElements;
2444 llvm::tie(numElements, elementType) = CGF.getVLASize(vla);
2445
2446 divisor = numElements;
2447
2448 // Scale the number of non-VLA elements by the non-VLA element size.
2449 CharUnits eltSize = CGF.getContext().getTypeSizeInChars(elementType);
2450 if (!eltSize.isOne())
2451 divisor = CGF.Builder.CreateNUWMul(CGF.CGM.getSize(eltSize), divisor);
2452
2453 // For everything elese, we can just compute it, safe in the
2454 // assumption that Sema won't let anything through that we can't
2455 // safely compute the size of.
2456 } else {
2457 CharUnits elementSize;
2458 // Handle GCC extension for pointer arithmetic on void* and
2459 // function pointer types.
2460 if (elementType->isVoidType() || elementType->isFunctionType())
2461 elementSize = CharUnits::One();
2462 else
2463 elementSize = CGF.getContext().getTypeSizeInChars(elementType);
2464
2465 // Don't even emit the divide for element size of 1.
2466 if (elementSize.isOne())
2467 return diffInChars;
2468
2469 divisor = CGF.CGM.getSize(elementSize);
Chris Lattner7f02f722007-08-24 05:35:26 +00002470 }
Chris Lattner2cb42222011-03-01 00:03:48 +00002471
Chris Lattner2cb42222011-03-01 00:03:48 +00002472 // Otherwise, do a full sdiv. This uses the "exact" form of sdiv, since
2473 // pointer difference in C is only defined in the case where both operands
2474 // are pointing to elements of an array.
John McCall913dab22011-06-25 01:32:37 +00002475 return Builder.CreateExactSDiv(diffInChars, divisor, "sub.ptr.div");
Chris Lattner7f02f722007-08-24 05:35:26 +00002476}
2477
David Tweed7a834212013-01-07 16:43:27 +00002478Value *ScalarExprEmitter::GetWidthMinusOneValue(Value* LHS,Value* RHS) {
David Tweedf20318f2013-01-10 09:11:33 +00002479 llvm::IntegerType *Ty;
2480 if (llvm::VectorType *VT = dyn_cast<llvm::VectorType>(LHS->getType()))
2481 Ty = cast<llvm::IntegerType>(VT->getElementType());
2482 else
2483 Ty = cast<llvm::IntegerType>(LHS->getType());
2484 return llvm::ConstantInt::get(RHS->getType(), Ty->getBitWidth() - 1);
David Tweed7a834212013-01-07 16:43:27 +00002485}
2486
Chris Lattner7f02f722007-08-24 05:35:26 +00002487Value *ScalarExprEmitter::EmitShl(const BinOpInfo &Ops) {
2488 // LLVM requires the LHS and RHS to be the same type: promote or truncate the
2489 // RHS to the same size as the LHS.
2490 Value *RHS = Ops.RHS;
2491 if (Ops.LHS->getType() != RHS->getType())
2492 RHS = Builder.CreateIntCast(RHS, Ops.LHS->getType(), false, "sh_prom");
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002493
Will Dietz4f45bc02013-01-18 11:30:38 +00002494 if (CGF.SanOpts->Shift && !CGF.getLangOpts().OpenCL &&
2495 isa<llvm::IntegerType>(Ops.LHS->getType())) {
David Tweed7a834212013-01-07 16:43:27 +00002496 llvm::Value *WidthMinusOne = GetWidthMinusOneValue(Ops.LHS, RHS);
Will Dietzbb60fc62013-02-25 22:37:49 +00002497 llvm::Value *Valid = Builder.CreateICmpULE(RHS, WidthMinusOne);
Richard Smith9d3e2262012-08-25 00:32:28 +00002498
2499 if (Ops.Ty->hasSignedIntegerRepresentation()) {
Will Dietzbb60fc62013-02-25 22:37:49 +00002500 llvm::BasicBlock *Orig = Builder.GetInsertBlock();
2501 llvm::BasicBlock *Cont = CGF.createBasicBlock("cont");
2502 llvm::BasicBlock *CheckBitsShifted = CGF.createBasicBlock("check");
2503 Builder.CreateCondBr(Valid, CheckBitsShifted, Cont);
2504
Richard Smith9d3e2262012-08-25 00:32:28 +00002505 // Check whether we are shifting any non-zero bits off the top of the
2506 // integer.
Will Dietzbb60fc62013-02-25 22:37:49 +00002507 CGF.EmitBlock(CheckBitsShifted);
Richard Smith9d3e2262012-08-25 00:32:28 +00002508 llvm::Value *BitsShiftedOff =
2509 Builder.CreateLShr(Ops.LHS,
2510 Builder.CreateSub(WidthMinusOne, RHS, "shl.zeros",
2511 /*NUW*/true, /*NSW*/true),
2512 "shl.check");
2513 if (CGF.getLangOpts().CPlusPlus) {
2514 // In C99, we are not permitted to shift a 1 bit into the sign bit.
2515 // Under C++11's rules, shifting a 1 bit into the sign bit is
2516 // OK, but shifting a 1 bit out of it is not. (C89 and C++03 don't
2517 // define signed left shifts, so we use the C99 and C++11 rules there).
2518 llvm::Value *One = llvm::ConstantInt::get(BitsShiftedOff->getType(), 1);
2519 BitsShiftedOff = Builder.CreateLShr(BitsShiftedOff, One);
2520 }
2521 llvm::Value *Zero = llvm::ConstantInt::get(BitsShiftedOff->getType(), 0);
Will Dietzbb60fc62013-02-25 22:37:49 +00002522 llvm::Value *SecondCheck = Builder.CreateICmpEQ(BitsShiftedOff, Zero);
2523 CGF.EmitBlock(Cont);
2524 llvm::PHINode *P = Builder.CreatePHI(Valid->getType(), 2);
2525 P->addIncoming(Valid, Orig);
2526 P->addIncoming(SecondCheck, CheckBitsShifted);
2527 Valid = P;
Richard Smith9d3e2262012-08-25 00:32:28 +00002528 }
Will Dietzbb60fc62013-02-25 22:37:49 +00002529
2530 EmitBinOpCheck(Valid, Ops);
Mike Stumpbe07f602009-12-14 21:58:14 +00002531 }
David Tweed7a834212013-01-07 16:43:27 +00002532 // OpenCL 6.3j: shift values are effectively % word size of LHS.
2533 if (CGF.getLangOpts().OpenCL)
2534 RHS = Builder.CreateAnd(RHS, GetWidthMinusOneValue(Ops.LHS, RHS), "shl.mask");
Mike Stumpbe07f602009-12-14 21:58:14 +00002535
Chris Lattner7f02f722007-08-24 05:35:26 +00002536 return Builder.CreateShl(Ops.LHS, RHS, "shl");
2537}
2538
2539Value *ScalarExprEmitter::EmitShr(const BinOpInfo &Ops) {
2540 // LLVM requires the LHS and RHS to be the same type: promote or truncate the
2541 // RHS to the same size as the LHS.
2542 Value *RHS = Ops.RHS;
2543 if (Ops.LHS->getType() != RHS->getType())
2544 RHS = Builder.CreateIntCast(RHS, Ops.LHS->getType(), false, "sh_prom");
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002545
Will Dietz4f45bc02013-01-18 11:30:38 +00002546 if (CGF.SanOpts->Shift && !CGF.getLangOpts().OpenCL &&
2547 isa<llvm::IntegerType>(Ops.LHS->getType()))
David Tweed7a834212013-01-07 16:43:27 +00002548 EmitBinOpCheck(Builder.CreateICmpULE(RHS, GetWidthMinusOneValue(Ops.LHS, RHS)), Ops);
2549
2550 // OpenCL 6.3j: shift values are effectively % word size of LHS.
2551 if (CGF.getLangOpts().OpenCL)
2552 RHS = Builder.CreateAnd(RHS, GetWidthMinusOneValue(Ops.LHS, RHS), "shr.mask");
Mike Stumpbe07f602009-12-14 21:58:14 +00002553
Douglas Gregorf6094622010-07-23 15:58:24 +00002554 if (Ops.Ty->hasUnsignedIntegerRepresentation())
Chris Lattner7f02f722007-08-24 05:35:26 +00002555 return Builder.CreateLShr(Ops.LHS, RHS, "shr");
2556 return Builder.CreateAShr(Ops.LHS, RHS, "shr");
2557}
2558
Anton Yartsevaa4fe052010-11-18 03:19:30 +00002559enum IntrinsicType { VCMPEQ, VCMPGT };
2560// return corresponding comparison intrinsic for given vector type
2561static llvm::Intrinsic::ID GetIntrinsic(IntrinsicType IT,
2562 BuiltinType::Kind ElemKind) {
2563 switch (ElemKind) {
David Blaikieb219cfc2011-09-23 05:06:16 +00002564 default: llvm_unreachable("unexpected element type");
Anton Yartsevaa4fe052010-11-18 03:19:30 +00002565 case BuiltinType::Char_U:
2566 case BuiltinType::UChar:
2567 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequb_p :
2568 llvm::Intrinsic::ppc_altivec_vcmpgtub_p;
Anton Yartsevaa4fe052010-11-18 03:19:30 +00002569 case BuiltinType::Char_S:
2570 case BuiltinType::SChar:
2571 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequb_p :
2572 llvm::Intrinsic::ppc_altivec_vcmpgtsb_p;
Anton Yartsevaa4fe052010-11-18 03:19:30 +00002573 case BuiltinType::UShort:
2574 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequh_p :
2575 llvm::Intrinsic::ppc_altivec_vcmpgtuh_p;
Anton Yartsevaa4fe052010-11-18 03:19:30 +00002576 case BuiltinType::Short:
2577 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequh_p :
2578 llvm::Intrinsic::ppc_altivec_vcmpgtsh_p;
Anton Yartsevaa4fe052010-11-18 03:19:30 +00002579 case BuiltinType::UInt:
2580 case BuiltinType::ULong:
2581 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequw_p :
2582 llvm::Intrinsic::ppc_altivec_vcmpgtuw_p;
Anton Yartsevaa4fe052010-11-18 03:19:30 +00002583 case BuiltinType::Int:
2584 case BuiltinType::Long:
2585 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequw_p :
2586 llvm::Intrinsic::ppc_altivec_vcmpgtsw_p;
Anton Yartsevaa4fe052010-11-18 03:19:30 +00002587 case BuiltinType::Float:
2588 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpeqfp_p :
2589 llvm::Intrinsic::ppc_altivec_vcmpgtfp_p;
Anton Yartsevaa4fe052010-11-18 03:19:30 +00002590 }
Anton Yartsevaa4fe052010-11-18 03:19:30 +00002591}
2592
Chris Lattner7f02f722007-08-24 05:35:26 +00002593Value *ScalarExprEmitter::EmitCompare(const BinaryOperator *E,unsigned UICmpOpc,
2594 unsigned SICmpOpc, unsigned FCmpOpc) {
Mike Stump7f79f9b2009-05-29 15:46:01 +00002595 TestAndClearIgnoreResultAssign();
Chris Lattner4f1a7b32007-08-26 16:34:22 +00002596 Value *Result;
Chris Lattner7f02f722007-08-24 05:35:26 +00002597 QualType LHSTy = E->getLHS()->getType();
John McCall0bab0cd2010-08-23 01:21:21 +00002598 if (const MemberPointerType *MPT = LHSTy->getAs<MemberPointerType>()) {
John McCall2de56d12010-08-25 11:45:40 +00002599 assert(E->getOpcode() == BO_EQ ||
2600 E->getOpcode() == BO_NE);
John McCalld608cdb2010-08-22 10:59:02 +00002601 Value *LHS = CGF.EmitScalarExpr(E->getLHS());
2602 Value *RHS = CGF.EmitScalarExpr(E->getRHS());
John McCall0bab0cd2010-08-23 01:21:21 +00002603 Result = CGF.CGM.getCXXABI().EmitMemberPointerComparison(
John McCall2de56d12010-08-25 11:45:40 +00002604 CGF, LHS, RHS, MPT, E->getOpcode() == BO_NE);
Eli Friedmanb81c7862009-12-11 07:36:43 +00002605 } else if (!LHSTy->isAnyComplexType()) {
Chris Lattner7f02f722007-08-24 05:35:26 +00002606 Value *LHS = Visit(E->getLHS());
2607 Value *RHS = Visit(E->getRHS());
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002608
Anton Yartsevaa4fe052010-11-18 03:19:30 +00002609 // If AltiVec, the comparison results in a numeric type, so we use
2610 // intrinsics comparing vectors and giving 0 or 1 as a result
Anton Yartsev6305f722011-03-28 21:00:05 +00002611 if (LHSTy->isVectorType() && !E->getType()->isVectorType()) {
Anton Yartsevaa4fe052010-11-18 03:19:30 +00002612 // constants for mapping CR6 register bits to predicate result
2613 enum { CR6_EQ=0, CR6_EQ_REV, CR6_LT, CR6_LT_REV } CR6;
2614
2615 llvm::Intrinsic::ID ID = llvm::Intrinsic::not_intrinsic;
2616
2617 // in several cases vector arguments order will be reversed
2618 Value *FirstVecArg = LHS,
2619 *SecondVecArg = RHS;
2620
2621 QualType ElTy = LHSTy->getAs<VectorType>()->getElementType();
John McCallf4c73712011-01-19 06:33:43 +00002622 const BuiltinType *BTy = ElTy->getAs<BuiltinType>();
Anton Yartsevaa4fe052010-11-18 03:19:30 +00002623 BuiltinType::Kind ElementKind = BTy->getKind();
2624
2625 switch(E->getOpcode()) {
David Blaikieb219cfc2011-09-23 05:06:16 +00002626 default: llvm_unreachable("is not a comparison operation");
Anton Yartsevaa4fe052010-11-18 03:19:30 +00002627 case BO_EQ:
2628 CR6 = CR6_LT;
2629 ID = GetIntrinsic(VCMPEQ, ElementKind);
2630 break;
2631 case BO_NE:
2632 CR6 = CR6_EQ;
2633 ID = GetIntrinsic(VCMPEQ, ElementKind);
2634 break;
2635 case BO_LT:
2636 CR6 = CR6_LT;
2637 ID = GetIntrinsic(VCMPGT, ElementKind);
2638 std::swap(FirstVecArg, SecondVecArg);
2639 break;
2640 case BO_GT:
2641 CR6 = CR6_LT;
2642 ID = GetIntrinsic(VCMPGT, ElementKind);
2643 break;
2644 case BO_LE:
2645 if (ElementKind == BuiltinType::Float) {
2646 CR6 = CR6_LT;
2647 ID = llvm::Intrinsic::ppc_altivec_vcmpgefp_p;
2648 std::swap(FirstVecArg, SecondVecArg);
2649 }
2650 else {
2651 CR6 = CR6_EQ;
2652 ID = GetIntrinsic(VCMPGT, ElementKind);
2653 }
2654 break;
2655 case BO_GE:
2656 if (ElementKind == BuiltinType::Float) {
2657 CR6 = CR6_LT;
2658 ID = llvm::Intrinsic::ppc_altivec_vcmpgefp_p;
2659 }
2660 else {
2661 CR6 = CR6_EQ;
2662 ID = GetIntrinsic(VCMPGT, ElementKind);
2663 std::swap(FirstVecArg, SecondVecArg);
2664 }
2665 break;
2666 }
2667
Chris Lattner48431f92011-04-19 22:55:03 +00002668 Value *CR6Param = Builder.getInt32(CR6);
Anton Yartsevaa4fe052010-11-18 03:19:30 +00002669 llvm::Function *F = CGF.CGM.getIntrinsic(ID);
2670 Result = Builder.CreateCall3(F, CR6Param, FirstVecArg, SecondVecArg, "");
2671 return EmitScalarConversion(Result, CGF.getContext().BoolTy, E->getType());
2672 }
2673
Duncan Sandsf177d9d2010-02-15 16:14:01 +00002674 if (LHS->getType()->isFPOrFPVectorTy()) {
Nate Begeman7a66d7b2008-07-25 20:16:05 +00002675 Result = Builder.CreateFCmp((llvm::CmpInst::Predicate)FCmpOpc,
Chris Lattner7f02f722007-08-24 05:35:26 +00002676 LHS, RHS, "cmp");
Douglas Gregorf6094622010-07-23 15:58:24 +00002677 } else if (LHSTy->hasSignedIntegerRepresentation()) {
Eli Friedmanec2c1262008-05-29 15:09:15 +00002678 Result = Builder.CreateICmp((llvm::ICmpInst::Predicate)SICmpOpc,
Chris Lattner7f02f722007-08-24 05:35:26 +00002679 LHS, RHS, "cmp");
2680 } else {
Eli Friedmanec2c1262008-05-29 15:09:15 +00002681 // Unsigned integers and pointers.
2682 Result = Builder.CreateICmp((llvm::ICmpInst::Predicate)UICmpOpc,
Chris Lattner7f02f722007-08-24 05:35:26 +00002683 LHS, RHS, "cmp");
2684 }
Chris Lattner9c10fcf2009-07-08 01:08:03 +00002685
2686 // If this is a vector comparison, sign extend the result to the appropriate
2687 // vector integer type and return it (don't convert to bool).
2688 if (LHSTy->isVectorType())
2689 return Builder.CreateSExt(Result, ConvertType(E->getType()), "sext");
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002690
Chris Lattner7f02f722007-08-24 05:35:26 +00002691 } else {
2692 // Complex Comparison: can only be an equality comparison.
2693 CodeGenFunction::ComplexPairTy LHS = CGF.EmitComplexExpr(E->getLHS());
2694 CodeGenFunction::ComplexPairTy RHS = CGF.EmitComplexExpr(E->getRHS());
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002695
John McCall183700f2009-09-21 23:43:11 +00002696 QualType CETy = LHSTy->getAs<ComplexType>()->getElementType();
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002697
Chris Lattner4f1a7b32007-08-26 16:34:22 +00002698 Value *ResultR, *ResultI;
Chris Lattner7f02f722007-08-24 05:35:26 +00002699 if (CETy->isRealFloatingType()) {
2700 ResultR = Builder.CreateFCmp((llvm::FCmpInst::Predicate)FCmpOpc,
2701 LHS.first, RHS.first, "cmp.r");
2702 ResultI = Builder.CreateFCmp((llvm::FCmpInst::Predicate)FCmpOpc,
2703 LHS.second, RHS.second, "cmp.i");
2704 } else {
2705 // Complex comparisons can only be equality comparisons. As such, signed
2706 // and unsigned opcodes are the same.
2707 ResultR = Builder.CreateICmp((llvm::ICmpInst::Predicate)UICmpOpc,
2708 LHS.first, RHS.first, "cmp.r");
2709 ResultI = Builder.CreateICmp((llvm::ICmpInst::Predicate)UICmpOpc,
2710 LHS.second, RHS.second, "cmp.i");
2711 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002712
John McCall2de56d12010-08-25 11:45:40 +00002713 if (E->getOpcode() == BO_EQ) {
Chris Lattner7f02f722007-08-24 05:35:26 +00002714 Result = Builder.CreateAnd(ResultR, ResultI, "and.ri");
2715 } else {
John McCall2de56d12010-08-25 11:45:40 +00002716 assert(E->getOpcode() == BO_NE &&
Chris Lattner7f02f722007-08-24 05:35:26 +00002717 "Complex comparison other than == or != ?");
2718 Result = Builder.CreateOr(ResultR, ResultI, "or.ri");
2719 }
2720 }
Nuno Lopes32f62092009-01-11 23:22:37 +00002721
2722 return EmitScalarConversion(Result, CGF.getContext().BoolTy, E->getType());
Chris Lattner7f02f722007-08-24 05:35:26 +00002723}
2724
2725Value *ScalarExprEmitter::VisitBinAssign(const BinaryOperator *E) {
Mike Stump7f79f9b2009-05-29 15:46:01 +00002726 bool Ignore = TestAndClearIgnoreResultAssign();
2727
John McCallf85e1932011-06-15 23:02:42 +00002728 Value *RHS;
2729 LValue LHS;
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002730
John McCallf85e1932011-06-15 23:02:42 +00002731 switch (E->getLHS()->getType().getObjCLifetime()) {
2732 case Qualifiers::OCL_Strong:
2733 llvm::tie(LHS, RHS) = CGF.EmitARCStoreStrong(E, Ignore);
2734 break;
2735
2736 case Qualifiers::OCL_Autoreleasing:
2737 llvm::tie(LHS,RHS) = CGF.EmitARCStoreAutoreleasing(E);
2738 break;
2739
2740 case Qualifiers::OCL_Weak:
2741 RHS = Visit(E->getRHS());
Richard Smith7ac9ef12012-09-08 02:08:36 +00002742 LHS = EmitCheckedLValue(E->getLHS(), CodeGenFunction::TCK_Store);
John McCallf85e1932011-06-15 23:02:42 +00002743 RHS = CGF.EmitARCStoreWeak(LHS.getAddress(), RHS, Ignore);
2744 break;
2745
2746 // No reason to do any of these differently.
2747 case Qualifiers::OCL_None:
2748 case Qualifiers::OCL_ExplicitNone:
2749 // __block variables need to have the rhs evaluated first, plus
2750 // this should improve codegen just a little.
2751 RHS = Visit(E->getRHS());
Richard Smith7ac9ef12012-09-08 02:08:36 +00002752 LHS = EmitCheckedLValue(E->getLHS(), CodeGenFunction::TCK_Store);
John McCallf85e1932011-06-15 23:02:42 +00002753
2754 // Store the value into the LHS. Bit-fields are handled specially
2755 // because the result is altered by the store, i.e., [C99 6.5.16p1]
2756 // 'An assignment expression has the value of the left operand after
2757 // the assignment...'.
2758 if (LHS.isBitField())
John McCall545d9962011-06-25 02:11:03 +00002759 CGF.EmitStoreThroughBitfieldLValue(RValue::get(RHS), LHS, &RHS);
John McCallf85e1932011-06-15 23:02:42 +00002760 else
John McCall545d9962011-06-25 02:11:03 +00002761 CGF.EmitStoreThroughLValue(RValue::get(RHS), LHS);
John McCallf85e1932011-06-15 23:02:42 +00002762 }
Daniel Dunbard7f7d082010-06-29 22:00:45 +00002763
2764 // If the result is clearly ignored, return now.
Mike Stump7f79f9b2009-05-29 15:46:01 +00002765 if (Ignore)
2766 return 0;
Daniel Dunbard7f7d082010-06-29 22:00:45 +00002767
John McCallb418d742010-11-16 10:08:07 +00002768 // The result of an assignment in C is the assigned r-value.
Richard Smith7edf9e32012-11-01 22:30:59 +00002769 if (!CGF.getLangOpts().CPlusPlus)
John McCallb418d742010-11-16 10:08:07 +00002770 return RHS;
2771
Daniel Dunbard7f7d082010-06-29 22:00:45 +00002772 // If the lvalue is non-volatile, return the computed value of the assignment.
2773 if (!LHS.isVolatileQualified())
2774 return RHS;
2775
2776 // Otherwise, reload the value.
John McCall545d9962011-06-25 02:11:03 +00002777 return EmitLoadOfLValue(LHS);
Chris Lattner7f02f722007-08-24 05:35:26 +00002778}
2779
2780Value *ScalarExprEmitter::VisitBinLAnd(const BinaryOperator *E) {
Tanya Lattner4f692c22012-01-16 21:02:28 +00002781 // Perform vector logical and on comparisons with zero vectors.
2782 if (E->getType()->isVectorType()) {
2783 Value *LHS = Visit(E->getLHS());
2784 Value *RHS = Visit(E->getRHS());
2785 Value *Zero = llvm::ConstantAggregateZero::get(LHS->getType());
Joey Gouly52e933b2013-02-21 11:49:56 +00002786 if (LHS->getType()->isFPOrFPVectorTy()) {
2787 LHS = Builder.CreateFCmp(llvm::CmpInst::FCMP_UNE, LHS, Zero, "cmp");
2788 RHS = Builder.CreateFCmp(llvm::CmpInst::FCMP_UNE, RHS, Zero, "cmp");
2789 } else {
2790 LHS = Builder.CreateICmp(llvm::CmpInst::ICMP_NE, LHS, Zero, "cmp");
2791 RHS = Builder.CreateICmp(llvm::CmpInst::ICMP_NE, RHS, Zero, "cmp");
2792 }
Tanya Lattner4f692c22012-01-16 21:02:28 +00002793 Value *And = Builder.CreateAnd(LHS, RHS);
Joey Gouly52e933b2013-02-21 11:49:56 +00002794 return Builder.CreateSExt(And, ConvertType(E->getType()), "sext");
Tanya Lattner4f692c22012-01-16 21:02:28 +00002795 }
2796
Chris Lattner2acc6e32011-07-18 04:24:23 +00002797 llvm::Type *ResTy = ConvertType(E->getType());
Chris Lattner7804bcb2009-10-17 04:24:20 +00002798
Chris Lattner20eb09d2008-11-12 08:26:50 +00002799 // If we have 0 && RHS, see if we can elide RHS, if so, just return 0.
2800 // If we have 1 && X, just emit X without inserting the control flow.
Chris Lattnerc2c90012011-02-27 23:02:32 +00002801 bool LHSCondVal;
2802 if (CGF.ConstantFoldsToSimpleInteger(E->getLHS(), LHSCondVal)) {
2803 if (LHSCondVal) { // If we have 1 && X, just emit X.
Chris Lattner0946ccd2008-11-11 07:41:27 +00002804 Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS());
Chris Lattner7804bcb2009-10-17 04:24:20 +00002805 // ZExt result to int or bool.
2806 return Builder.CreateZExtOrBitCast(RHSCond, ResTy, "land.ext");
Chris Lattner0946ccd2008-11-11 07:41:27 +00002807 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002808
Chris Lattner7804bcb2009-10-17 04:24:20 +00002809 // 0 && RHS: If it is safe, just elide the RHS, and return 0/false.
Chris Lattner20eb09d2008-11-12 08:26:50 +00002810 if (!CGF.ContainsLabel(E->getRHS()))
Chris Lattner7804bcb2009-10-17 04:24:20 +00002811 return llvm::Constant::getNullValue(ResTy);
Chris Lattner0946ccd2008-11-11 07:41:27 +00002812 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002813
Daniel Dunbar9615ecb2008-11-13 01:38:36 +00002814 llvm::BasicBlock *ContBlock = CGF.createBasicBlock("land.end");
2815 llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("land.rhs");
Chris Lattner20eb09d2008-11-12 08:26:50 +00002816
John McCall150b4622011-01-26 04:00:11 +00002817 CodeGenFunction::ConditionalEvaluation eval(CGF);
2818
Chris Lattnerf7b5ea92008-11-12 08:38:24 +00002819 // Branch on the LHS first. If it is false, go to the failure (cont) block.
2820 CGF.EmitBranchOnBoolExpr(E->getLHS(), RHSBlock, ContBlock);
2821
2822 // Any edges into the ContBlock are now from an (indeterminate number of)
2823 // edges from this first condition. All of these values will be false. Start
2824 // setting up the PHI node in the Cont Block for this.
Jay Foadbbf3bac2011-03-30 11:28:58 +00002825 llvm::PHINode *PN = llvm::PHINode::Create(llvm::Type::getInt1Ty(VMContext), 2,
Owen Anderson0032b272009-08-13 21:57:51 +00002826 "", ContBlock);
Chris Lattnerf7b5ea92008-11-12 08:38:24 +00002827 for (llvm::pred_iterator PI = pred_begin(ContBlock), PE = pred_end(ContBlock);
2828 PI != PE; ++PI)
Owen Anderson3b144ba2009-07-31 17:39:36 +00002829 PN->addIncoming(llvm::ConstantInt::getFalse(VMContext), *PI);
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002830
John McCall150b4622011-01-26 04:00:11 +00002831 eval.begin(CGF);
Chris Lattner7f02f722007-08-24 05:35:26 +00002832 CGF.EmitBlock(RHSBlock);
2833 Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS());
John McCall150b4622011-01-26 04:00:11 +00002834 eval.end(CGF);
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002835
Chris Lattner7f02f722007-08-24 05:35:26 +00002836 // Reaquire the RHS block, as there may be subblocks inserted.
2837 RHSBlock = Builder.GetInsertBlock();
Chris Lattnerf7b5ea92008-11-12 08:38:24 +00002838
2839 // Emit an unconditional branch from this block to ContBlock. Insert an entry
2840 // into the phi node for the edge with the value of RHSCond.
Devang Patelacd72362011-03-30 00:08:31 +00002841 if (CGF.getDebugInfo())
2842 // There is no need to emit line number for unconditional branch.
2843 Builder.SetCurrentDebugLocation(llvm::DebugLoc());
Chris Lattner7f02f722007-08-24 05:35:26 +00002844 CGF.EmitBlock(ContBlock);
Chris Lattner7f02f722007-08-24 05:35:26 +00002845 PN->addIncoming(RHSCond, RHSBlock);
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002846
Chris Lattner7f02f722007-08-24 05:35:26 +00002847 // ZExt result to int.
Chris Lattner7804bcb2009-10-17 04:24:20 +00002848 return Builder.CreateZExtOrBitCast(PN, ResTy, "land.ext");
Chris Lattner7f02f722007-08-24 05:35:26 +00002849}
2850
2851Value *ScalarExprEmitter::VisitBinLOr(const BinaryOperator *E) {
Tanya Lattner4f692c22012-01-16 21:02:28 +00002852 // Perform vector logical or on comparisons with zero vectors.
2853 if (E->getType()->isVectorType()) {
2854 Value *LHS = Visit(E->getLHS());
2855 Value *RHS = Visit(E->getRHS());
2856 Value *Zero = llvm::ConstantAggregateZero::get(LHS->getType());
Joey Gouly52e933b2013-02-21 11:49:56 +00002857 if (LHS->getType()->isFPOrFPVectorTy()) {
2858 LHS = Builder.CreateFCmp(llvm::CmpInst::FCMP_UNE, LHS, Zero, "cmp");
2859 RHS = Builder.CreateFCmp(llvm::CmpInst::FCMP_UNE, RHS, Zero, "cmp");
2860 } else {
2861 LHS = Builder.CreateICmp(llvm::CmpInst::ICMP_NE, LHS, Zero, "cmp");
2862 RHS = Builder.CreateICmp(llvm::CmpInst::ICMP_NE, RHS, Zero, "cmp");
2863 }
Tanya Lattner4f692c22012-01-16 21:02:28 +00002864 Value *Or = Builder.CreateOr(LHS, RHS);
Joey Gouly52e933b2013-02-21 11:49:56 +00002865 return Builder.CreateSExt(Or, ConvertType(E->getType()), "sext");
Tanya Lattner4f692c22012-01-16 21:02:28 +00002866 }
2867
Chris Lattner2acc6e32011-07-18 04:24:23 +00002868 llvm::Type *ResTy = ConvertType(E->getType());
Chris Lattner7804bcb2009-10-17 04:24:20 +00002869
Chris Lattner20eb09d2008-11-12 08:26:50 +00002870 // If we have 1 || RHS, see if we can elide RHS, if so, just return 1.
2871 // If we have 0 || X, just emit X without inserting the control flow.
Chris Lattnerc2c90012011-02-27 23:02:32 +00002872 bool LHSCondVal;
2873 if (CGF.ConstantFoldsToSimpleInteger(E->getLHS(), LHSCondVal)) {
2874 if (!LHSCondVal) { // If we have 0 || X, just emit X.
Chris Lattner0946ccd2008-11-11 07:41:27 +00002875 Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS());
Chris Lattner7804bcb2009-10-17 04:24:20 +00002876 // ZExt result to int or bool.
2877 return Builder.CreateZExtOrBitCast(RHSCond, ResTy, "lor.ext");
Chris Lattner0946ccd2008-11-11 07:41:27 +00002878 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002879
Chris Lattner7804bcb2009-10-17 04:24:20 +00002880 // 1 || RHS: If it is safe, just elide the RHS, and return 1/true.
Chris Lattner20eb09d2008-11-12 08:26:50 +00002881 if (!CGF.ContainsLabel(E->getRHS()))
Chris Lattner7804bcb2009-10-17 04:24:20 +00002882 return llvm::ConstantInt::get(ResTy, 1);
Chris Lattner0946ccd2008-11-11 07:41:27 +00002883 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002884
Daniel Dunbar9615ecb2008-11-13 01:38:36 +00002885 llvm::BasicBlock *ContBlock = CGF.createBasicBlock("lor.end");
2886 llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("lor.rhs");
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002887
John McCall150b4622011-01-26 04:00:11 +00002888 CodeGenFunction::ConditionalEvaluation eval(CGF);
2889
Chris Lattnerf7b5ea92008-11-12 08:38:24 +00002890 // Branch on the LHS first. If it is true, go to the success (cont) block.
2891 CGF.EmitBranchOnBoolExpr(E->getLHS(), ContBlock, RHSBlock);
2892
2893 // Any edges into the ContBlock are now from an (indeterminate number of)
2894 // edges from this first condition. All of these values will be true. Start
2895 // setting up the PHI node in the Cont Block for this.
Jay Foadbbf3bac2011-03-30 11:28:58 +00002896 llvm::PHINode *PN = llvm::PHINode::Create(llvm::Type::getInt1Ty(VMContext), 2,
Owen Anderson0032b272009-08-13 21:57:51 +00002897 "", ContBlock);
Chris Lattnerf7b5ea92008-11-12 08:38:24 +00002898 for (llvm::pred_iterator PI = pred_begin(ContBlock), PE = pred_end(ContBlock);
2899 PI != PE; ++PI)
Owen Anderson3b144ba2009-07-31 17:39:36 +00002900 PN->addIncoming(llvm::ConstantInt::getTrue(VMContext), *PI);
Chris Lattnerf7b5ea92008-11-12 08:38:24 +00002901
John McCall150b4622011-01-26 04:00:11 +00002902 eval.begin(CGF);
Anders Carlsson33da07d2009-06-04 02:53:13 +00002903
Chris Lattnerf7b5ea92008-11-12 08:38:24 +00002904 // Emit the RHS condition as a bool value.
Chris Lattner7f02f722007-08-24 05:35:26 +00002905 CGF.EmitBlock(RHSBlock);
2906 Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS());
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002907
John McCall150b4622011-01-26 04:00:11 +00002908 eval.end(CGF);
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002909
Chris Lattner7f02f722007-08-24 05:35:26 +00002910 // Reaquire the RHS block, as there may be subblocks inserted.
2911 RHSBlock = Builder.GetInsertBlock();
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002912
Chris Lattnerf7b5ea92008-11-12 08:38:24 +00002913 // Emit an unconditional branch from this block to ContBlock. Insert an entry
2914 // into the phi node for the edge with the value of RHSCond.
2915 CGF.EmitBlock(ContBlock);
Chris Lattner7f02f722007-08-24 05:35:26 +00002916 PN->addIncoming(RHSCond, RHSBlock);
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002917
Chris Lattner7f02f722007-08-24 05:35:26 +00002918 // ZExt result to int.
Chris Lattner7804bcb2009-10-17 04:24:20 +00002919 return Builder.CreateZExtOrBitCast(PN, ResTy, "lor.ext");
Chris Lattner7f02f722007-08-24 05:35:26 +00002920}
2921
2922Value *ScalarExprEmitter::VisitBinComma(const BinaryOperator *E) {
John McCall2a416372010-12-05 02:00:02 +00002923 CGF.EmitIgnoredExpr(E->getLHS());
Daniel Dunbara448fb22008-11-11 23:11:34 +00002924 CGF.EnsureInsertPoint();
Chris Lattner7f02f722007-08-24 05:35:26 +00002925 return Visit(E->getRHS());
2926}
2927
2928//===----------------------------------------------------------------------===//
2929// Other Operators
2930//===----------------------------------------------------------------------===//
2931
Chris Lattner9802a512008-11-12 08:55:54 +00002932/// isCheapEnoughToEvaluateUnconditionally - Return true if the specified
2933/// expression is cheap enough and side-effect-free enough to evaluate
2934/// unconditionally instead of conditionally. This is used to convert control
2935/// flow into selects in some cases.
Mike Stumpdf317bf2009-11-03 23:25:48 +00002936static bool isCheapEnoughToEvaluateUnconditionally(const Expr *E,
2937 CodeGenFunction &CGF) {
Peter Collingbournef111d932011-04-15 00:35:48 +00002938 E = E->IgnoreParens();
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002939
Chris Lattnerc6bea672011-04-16 23:15:35 +00002940 // Anything that is an integer or floating point constant is fine.
2941 if (E->isConstantInitializer(CGF.getContext(), false))
Chris Lattner9802a512008-11-12 08:55:54 +00002942 return true;
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002943
Chris Lattner9802a512008-11-12 08:55:54 +00002944 // Non-volatile automatic variables too, to get "cond ? X : Y" where
2945 // X and Y are local variables.
2946 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E))
2947 if (const VarDecl *VD = dyn_cast<VarDecl>(DRE->getDecl()))
Mike Stumpdf317bf2009-11-03 23:25:48 +00002948 if (VD->hasLocalStorage() && !(CGF.getContext()
2949 .getCanonicalType(VD->getType())
2950 .isVolatileQualified()))
Chris Lattner9802a512008-11-12 08:55:54 +00002951 return true;
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002952
Chris Lattner9802a512008-11-12 08:55:54 +00002953 return false;
2954}
2955
2956
Chris Lattner7f02f722007-08-24 05:35:26 +00002957Value *ScalarExprEmitter::
John McCall56ca35d2011-02-17 10:25:35 +00002958VisitAbstractConditionalOperator(const AbstractConditionalOperator *E) {
Mike Stump7f79f9b2009-05-29 15:46:01 +00002959 TestAndClearIgnoreResultAssign();
John McCall56ca35d2011-02-17 10:25:35 +00002960
2961 // Bind the common expression if necessary.
Eli Friedmand97927d2012-01-06 20:42:20 +00002962 CodeGenFunction::OpaqueValueMapping binding(CGF, E);
John McCall56ca35d2011-02-17 10:25:35 +00002963
2964 Expr *condExpr = E->getCond();
2965 Expr *lhsExpr = E->getTrueExpr();
2966 Expr *rhsExpr = E->getFalseExpr();
2967
Chris Lattner31a09842008-11-12 08:04:58 +00002968 // If the condition constant folds and can be elided, try to avoid emitting
2969 // the condition and the dead arm.
Chris Lattnerc2c90012011-02-27 23:02:32 +00002970 bool CondExprBool;
2971 if (CGF.ConstantFoldsToSimpleInteger(condExpr, CondExprBool)) {
John McCall56ca35d2011-02-17 10:25:35 +00002972 Expr *live = lhsExpr, *dead = rhsExpr;
Chris Lattnerc2c90012011-02-27 23:02:32 +00002973 if (!CondExprBool) std::swap(live, dead);
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002974
Eli Friedmanc8645e32011-10-15 02:10:40 +00002975 // If the dead side doesn't have labels we need, just emit the Live part.
2976 if (!CGF.ContainsLabel(dead)) {
2977 Value *Result = Visit(live);
2978
2979 // If the live part is a throw expression, it acts like it has a void
2980 // type, so evaluating it returns a null Value*. However, a conditional
2981 // with non-void type must return a non-null Value*.
2982 if (!Result && !E->getType()->isVoidType())
2983 Result = llvm::UndefValue::get(CGF.ConvertType(E->getType()));
2984
2985 return Result;
2986 }
Chris Lattnerc657e922008-11-11 18:56:45 +00002987 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002988
Nate Begeman6155d732010-09-20 22:41:17 +00002989 // OpenCL: If the condition is a vector, we can treat this condition like
2990 // the select function.
Richard Smith7edf9e32012-11-01 22:30:59 +00002991 if (CGF.getLangOpts().OpenCL
John McCall56ca35d2011-02-17 10:25:35 +00002992 && condExpr->getType()->isVectorType()) {
2993 llvm::Value *CondV = CGF.EmitScalarExpr(condExpr);
2994 llvm::Value *LHS = Visit(lhsExpr);
2995 llvm::Value *RHS = Visit(rhsExpr);
Nate Begeman6155d732010-09-20 22:41:17 +00002996
Chris Lattner2acc6e32011-07-18 04:24:23 +00002997 llvm::Type *condType = ConvertType(condExpr->getType());
2998 llvm::VectorType *vecTy = cast<llvm::VectorType>(condType);
Nate Begeman6155d732010-09-20 22:41:17 +00002999
3000 unsigned numElem = vecTy->getNumElements();
Chris Lattner2acc6e32011-07-18 04:24:23 +00003001 llvm::Type *elemType = vecTy->getElementType();
Nate Begeman6155d732010-09-20 22:41:17 +00003002
Chris Lattner2ce88422012-01-25 05:34:41 +00003003 llvm::Value *zeroVec = llvm::Constant::getNullValue(vecTy);
Nate Begeman6155d732010-09-20 22:41:17 +00003004 llvm::Value *TestMSB = Builder.CreateICmpSLT(CondV, zeroVec);
3005 llvm::Value *tmp = Builder.CreateSExt(TestMSB,
3006 llvm::VectorType::get(elemType,
3007 numElem),
3008 "sext");
3009 llvm::Value *tmp2 = Builder.CreateNot(tmp);
3010
3011 // Cast float to int to perform ANDs if necessary.
3012 llvm::Value *RHSTmp = RHS;
3013 llvm::Value *LHSTmp = LHS;
3014 bool wasCast = false;
Chris Lattner2acc6e32011-07-18 04:24:23 +00003015 llvm::VectorType *rhsVTy = cast<llvm::VectorType>(RHS->getType());
Peter Collingbourne565204d2012-05-29 00:35:18 +00003016 if (rhsVTy->getElementType()->isFloatingPointTy()) {
Nate Begeman6155d732010-09-20 22:41:17 +00003017 RHSTmp = Builder.CreateBitCast(RHS, tmp2->getType());
3018 LHSTmp = Builder.CreateBitCast(LHS, tmp->getType());
3019 wasCast = true;
3020 }
3021
3022 llvm::Value *tmp3 = Builder.CreateAnd(RHSTmp, tmp2);
3023 llvm::Value *tmp4 = Builder.CreateAnd(LHSTmp, tmp);
3024 llvm::Value *tmp5 = Builder.CreateOr(tmp3, tmp4, "cond");
3025 if (wasCast)
3026 tmp5 = Builder.CreateBitCast(tmp5, RHS->getType());
3027
3028 return tmp5;
3029 }
3030
Chris Lattner9802a512008-11-12 08:55:54 +00003031 // If this is a really simple expression (like x ? 4 : 5), emit this as a
3032 // select instead of as control flow. We can only do this if it is cheap and
Chris Lattner531a5502008-11-16 06:16:27 +00003033 // safe to evaluate the LHS and RHS unconditionally.
John McCall56ca35d2011-02-17 10:25:35 +00003034 if (isCheapEnoughToEvaluateUnconditionally(lhsExpr, CGF) &&
3035 isCheapEnoughToEvaluateUnconditionally(rhsExpr, CGF)) {
3036 llvm::Value *CondV = CGF.EvaluateExprAsBool(condExpr);
3037 llvm::Value *LHS = Visit(lhsExpr);
3038 llvm::Value *RHS = Visit(rhsExpr);
Eli Friedman1e4f68c2011-12-08 22:01:56 +00003039 if (!LHS) {
3040 // If the conditional has void type, make sure we return a null Value*.
3041 assert(!RHS && "LHS and RHS types must match");
3042 return 0;
3043 }
Chris Lattner9802a512008-11-12 08:55:54 +00003044 return Builder.CreateSelect(CondV, LHS, RHS, "cond");
3045 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +00003046
Daniel Dunbarbe65abc2008-11-12 10:13:37 +00003047 llvm::BasicBlock *LHSBlock = CGF.createBasicBlock("cond.true");
3048 llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("cond.false");
Daniel Dunbar9615ecb2008-11-13 01:38:36 +00003049 llvm::BasicBlock *ContBlock = CGF.createBasicBlock("cond.end");
John McCall150b4622011-01-26 04:00:11 +00003050
3051 CodeGenFunction::ConditionalEvaluation eval(CGF);
John McCall56ca35d2011-02-17 10:25:35 +00003052 CGF.EmitBranchOnBoolExpr(condExpr, LHSBlock, RHSBlock);
Anders Carlssonfb6fa302009-06-04 03:00:32 +00003053
Chris Lattner7f02f722007-08-24 05:35:26 +00003054 CGF.EmitBlock(LHSBlock);
John McCall150b4622011-01-26 04:00:11 +00003055 eval.begin(CGF);
John McCall56ca35d2011-02-17 10:25:35 +00003056 Value *LHS = Visit(lhsExpr);
John McCall150b4622011-01-26 04:00:11 +00003057 eval.end(CGF);
Mike Stumpdb52dcd2009-09-09 13:00:44 +00003058
Chris Lattner7f02f722007-08-24 05:35:26 +00003059 LHSBlock = Builder.GetInsertBlock();
John McCall150b4622011-01-26 04:00:11 +00003060 Builder.CreateBr(ContBlock);
Mike Stumpdb52dcd2009-09-09 13:00:44 +00003061
Chris Lattner7f02f722007-08-24 05:35:26 +00003062 CGF.EmitBlock(RHSBlock);
John McCall150b4622011-01-26 04:00:11 +00003063 eval.begin(CGF);
John McCall56ca35d2011-02-17 10:25:35 +00003064 Value *RHS = Visit(rhsExpr);
John McCall150b4622011-01-26 04:00:11 +00003065 eval.end(CGF);
Mike Stumpdb52dcd2009-09-09 13:00:44 +00003066
John McCall150b4622011-01-26 04:00:11 +00003067 RHSBlock = Builder.GetInsertBlock();
Chris Lattner7f02f722007-08-24 05:35:26 +00003068 CGF.EmitBlock(ContBlock);
Mike Stumpdb52dcd2009-09-09 13:00:44 +00003069
Eli Friedman48daf592009-12-07 20:25:53 +00003070 // If the LHS or RHS is a throw expression, it will be legitimately null.
3071 if (!LHS)
3072 return RHS;
3073 if (!RHS)
3074 return LHS;
Mike Stumpdb52dcd2009-09-09 13:00:44 +00003075
Chris Lattner7f02f722007-08-24 05:35:26 +00003076 // Create a PHI node for the real part.
Jay Foadbbf3bac2011-03-30 11:28:58 +00003077 llvm::PHINode *PN = Builder.CreatePHI(LHS->getType(), 2, "cond");
Chris Lattner7f02f722007-08-24 05:35:26 +00003078 PN->addIncoming(LHS, LHSBlock);
3079 PN->addIncoming(RHS, RHSBlock);
3080 return PN;
3081}
3082
3083Value *ScalarExprEmitter::VisitChooseExpr(ChooseExpr *E) {
Eli Friedman79769322009-03-04 05:52:32 +00003084 return Visit(E->getChosenSubExpr(CGF.getContext()));
Chris Lattner7f02f722007-08-24 05:35:26 +00003085}
3086
Chris Lattner2202bce2007-11-30 17:56:23 +00003087Value *ScalarExprEmitter::VisitVAArgExpr(VAArgExpr *VE) {
Eli Friedman4fd0aa52009-01-20 17:46:04 +00003088 llvm::Value *ArgValue = CGF.EmitVAListRef(VE->getSubExpr());
Anders Carlssonddf7cac2008-11-04 05:30:00 +00003089 llvm::Value *ArgPtr = CGF.EmitVAArg(ArgValue, VE->getType());
3090
3091 // If EmitVAArg fails, we fall back to the LLVM instruction.
Mike Stumpdb52dcd2009-09-09 13:00:44 +00003092 if (!ArgPtr)
Anders Carlssonddf7cac2008-11-04 05:30:00 +00003093 return Builder.CreateVAArg(ArgValue, ConvertType(VE->getType()));
3094
Mike Stump7f79f9b2009-05-29 15:46:01 +00003095 // FIXME Volatility.
Anders Carlssonddf7cac2008-11-04 05:30:00 +00003096 return Builder.CreateLoad(ArgPtr);
Anders Carlsson7c50aca2007-10-15 20:28:48 +00003097}
3098
John McCall6b5a61b2011-02-07 10:33:21 +00003099Value *ScalarExprEmitter::VisitBlockExpr(const BlockExpr *block) {
3100 return CGF.EmitBlockLiteral(block);
Mike Stumpdf6b68c2009-02-12 18:29:15 +00003101}
3102
Tanya Lattner61eee0c2011-06-04 00:47:47 +00003103Value *ScalarExprEmitter::VisitAsTypeExpr(AsTypeExpr *E) {
3104 Value *Src = CGF.EmitScalarExpr(E->getSrcExpr());
Chris Lattner2acc6e32011-07-18 04:24:23 +00003105 llvm::Type *DstTy = ConvertType(E->getType());
Tanya Lattner61eee0c2011-06-04 00:47:47 +00003106
3107 // Going from vec4->vec3 or vec3->vec4 is a special case and requires
3108 // a shuffle vector instead of a bitcast.
Chris Lattner2acc6e32011-07-18 04:24:23 +00003109 llvm::Type *SrcTy = Src->getType();
Tanya Lattner61eee0c2011-06-04 00:47:47 +00003110 if (isa<llvm::VectorType>(DstTy) && isa<llvm::VectorType>(SrcTy)) {
3111 unsigned numElementsDst = cast<llvm::VectorType>(DstTy)->getNumElements();
3112 unsigned numElementsSrc = cast<llvm::VectorType>(SrcTy)->getNumElements();
3113 if ((numElementsDst == 3 && numElementsSrc == 4)
3114 || (numElementsDst == 4 && numElementsSrc == 3)) {
3115
3116
3117 // In the case of going from int4->float3, a bitcast is needed before
3118 // doing a shuffle.
Chris Lattner2acc6e32011-07-18 04:24:23 +00003119 llvm::Type *srcElemTy =
Tanya Lattner61eee0c2011-06-04 00:47:47 +00003120 cast<llvm::VectorType>(SrcTy)->getElementType();
Chris Lattner2acc6e32011-07-18 04:24:23 +00003121 llvm::Type *dstElemTy =
Tanya Lattner61eee0c2011-06-04 00:47:47 +00003122 cast<llvm::VectorType>(DstTy)->getElementType();
3123
3124 if ((srcElemTy->isIntegerTy() && dstElemTy->isFloatTy())
3125 || (srcElemTy->isFloatTy() && dstElemTy->isIntegerTy())) {
3126 // Create a float type of the same size as the source or destination.
Chris Lattner2acc6e32011-07-18 04:24:23 +00003127 llvm::VectorType *newSrcTy = llvm::VectorType::get(dstElemTy,
Tanya Lattner61eee0c2011-06-04 00:47:47 +00003128 numElementsSrc);
3129
3130 Src = Builder.CreateBitCast(Src, newSrcTy, "astypeCast");
3131 }
3132
3133 llvm::Value *UnV = llvm::UndefValue::get(Src->getType());
3134
Chris Lattner5f9e2722011-07-23 10:55:15 +00003135 SmallVector<llvm::Constant*, 3> Args;
Tanya Lattner61eee0c2011-06-04 00:47:47 +00003136 Args.push_back(Builder.getInt32(0));
3137 Args.push_back(Builder.getInt32(1));
3138 Args.push_back(Builder.getInt32(2));
3139
3140 if (numElementsDst == 4)
Chris Lattner8b418682012-02-07 00:39:47 +00003141 Args.push_back(llvm::UndefValue::get(CGF.Int32Ty));
Tanya Lattner61eee0c2011-06-04 00:47:47 +00003142
3143 llvm::Constant *Mask = llvm::ConstantVector::get(Args);
3144
3145 return Builder.CreateShuffleVector(Src, UnV, Mask, "astype");
3146 }
3147 }
3148
3149 return Builder.CreateBitCast(Src, DstTy, "astype");
3150}
3151
Eli Friedman276b0612011-10-11 02:20:01 +00003152Value *ScalarExprEmitter::VisitAtomicExpr(AtomicExpr *E) {
3153 return CGF.EmitAtomicExpr(E).getScalarVal();
3154}
3155
Chris Lattner7f02f722007-08-24 05:35:26 +00003156//===----------------------------------------------------------------------===//
3157// Entry Point into this File
3158//===----------------------------------------------------------------------===//
3159
Mike Stumpdb52dcd2009-09-09 13:00:44 +00003160/// EmitScalarExpr - Emit the computation of the specified expression of scalar
3161/// type, ignoring the result.
Mike Stump7f79f9b2009-05-29 15:46:01 +00003162Value *CodeGenFunction::EmitScalarExpr(const Expr *E, bool IgnoreResultAssign) {
John McCall9d232c82013-03-07 21:37:08 +00003163 assert(E && hasScalarEvaluationKind(E->getType()) &&
Chris Lattner7f02f722007-08-24 05:35:26 +00003164 "Invalid scalar expression to emit");
Mike Stumpdb52dcd2009-09-09 13:00:44 +00003165
Devang Patel5de7a0e2011-03-07 18:29:53 +00003166 if (isa<CXXDefaultArgExpr>(E))
Devang Patelaa112892011-03-07 18:45:56 +00003167 disableDebugInfo();
Devang Patel5de7a0e2011-03-07 18:29:53 +00003168 Value *V = ScalarExprEmitter(*this, IgnoreResultAssign)
Mike Stump7f79f9b2009-05-29 15:46:01 +00003169 .Visit(const_cast<Expr*>(E));
Devang Patel5de7a0e2011-03-07 18:29:53 +00003170 if (isa<CXXDefaultArgExpr>(E))
Devang Patelaa112892011-03-07 18:45:56 +00003171 enableDebugInfo();
Devang Patel5de7a0e2011-03-07 18:29:53 +00003172 return V;
Chris Lattner7f02f722007-08-24 05:35:26 +00003173}
Chris Lattner3707b252007-08-26 06:48:56 +00003174
3175/// EmitScalarConversion - Emit a conversion from the specified type to the
3176/// specified destination type, both of which are LLVM scalar types.
Chris Lattner4f1a7b32007-08-26 16:34:22 +00003177Value *CodeGenFunction::EmitScalarConversion(Value *Src, QualType SrcTy,
3178 QualType DstTy) {
John McCall9d232c82013-03-07 21:37:08 +00003179 assert(hasScalarEvaluationKind(SrcTy) && hasScalarEvaluationKind(DstTy) &&
Chris Lattner3707b252007-08-26 06:48:56 +00003180 "Invalid scalar expression to emit");
3181 return ScalarExprEmitter(*this).EmitScalarConversion(Src, SrcTy, DstTy);
3182}
Chris Lattner4f1a7b32007-08-26 16:34:22 +00003183
Mike Stumpdb52dcd2009-09-09 13:00:44 +00003184/// EmitComplexToScalarConversion - Emit a conversion from the specified complex
3185/// type to the specified destination type, where the destination type is an
3186/// LLVM scalar type.
Chris Lattner4f1a7b32007-08-26 16:34:22 +00003187Value *CodeGenFunction::EmitComplexToScalarConversion(ComplexPairTy Src,
3188 QualType SrcTy,
3189 QualType DstTy) {
John McCall9d232c82013-03-07 21:37:08 +00003190 assert(SrcTy->isAnyComplexType() && hasScalarEvaluationKind(DstTy) &&
Chris Lattner4f1a7b32007-08-26 16:34:22 +00003191 "Invalid complex -> scalar conversion");
3192 return ScalarExprEmitter(*this).EmitComplexToScalarConversion(Src, SrcTy,
3193 DstTy);
3194}
Anders Carlssoncc23aca2007-12-10 19:35:18 +00003195
Chris Lattner8c11a652010-06-26 22:09:34 +00003196
3197llvm::Value *CodeGenFunction::
3198EmitScalarPrePostIncDec(const UnaryOperator *E, LValue LV,
3199 bool isInc, bool isPre) {
3200 return ScalarExprEmitter(*this).EmitScalarPrePostIncDec(E, LV, isInc, isPre);
3201}
3202
Fariborz Jahanian820bca42009-12-09 23:35:29 +00003203LValue CodeGenFunction::EmitObjCIsaExpr(const ObjCIsaExpr *E) {
3204 llvm::Value *V;
3205 // object->isa or (*object).isa
3206 // Generate code as for: *(Class*)object
Fariborz Jahanian820bca42009-12-09 23:35:29 +00003207 // build Class* type
Chris Lattner2acc6e32011-07-18 04:24:23 +00003208 llvm::Type *ClassPtrTy = ConvertType(E->getType());
Fariborz Jahanian5ed676c2010-02-05 19:18:30 +00003209
3210 Expr *BaseExpr = E->getBase();
John McCall7eb0a9e2010-11-24 05:12:34 +00003211 if (BaseExpr->isRValue()) {
Eli Friedmand71f4422011-12-19 23:03:09 +00003212 V = CreateMemTemp(E->getType(), "resval");
Fariborz Jahanian5ed676c2010-02-05 19:18:30 +00003213 llvm::Value *Src = EmitScalarExpr(BaseExpr);
3214 Builder.CreateStore(Src, V);
Daniel Dunbar9f553f52010-08-21 03:08:16 +00003215 V = ScalarExprEmitter(*this).EmitLoadOfLValue(
Eli Friedmand71f4422011-12-19 23:03:09 +00003216 MakeNaturalAlignAddrLValue(V, E->getType()));
Daniel Dunbar9f553f52010-08-21 03:08:16 +00003217 } else {
3218 if (E->isArrow())
3219 V = ScalarExprEmitter(*this).EmitLoadOfLValue(BaseExpr);
3220 else
3221 V = EmitLValue(BaseExpr).getAddress();
Fariborz Jahanian5ed676c2010-02-05 19:18:30 +00003222 }
3223
3224 // build Class* type
Fariborz Jahanian820bca42009-12-09 23:35:29 +00003225 ClassPtrTy = ClassPtrTy->getPointerTo();
3226 V = Builder.CreateBitCast(V, ClassPtrTy);
Eli Friedmand71f4422011-12-19 23:03:09 +00003227 return MakeNaturalAlignAddrLValue(V, E->getType());
Fariborz Jahanian820bca42009-12-09 23:35:29 +00003228}
3229
Douglas Gregor6a03e342010-04-23 04:16:32 +00003230
John McCall2a416372010-12-05 02:00:02 +00003231LValue CodeGenFunction::EmitCompoundAssignmentLValue(
Douglas Gregor6a03e342010-04-23 04:16:32 +00003232 const CompoundAssignOperator *E) {
3233 ScalarExprEmitter Scalar(*this);
Daniel Dunbard7f7d082010-06-29 22:00:45 +00003234 Value *Result = 0;
Douglas Gregor6a03e342010-04-23 04:16:32 +00003235 switch (E->getOpcode()) {
3236#define COMPOUND_OP(Op) \
John McCall2de56d12010-08-25 11:45:40 +00003237 case BO_##Op##Assign: \
Douglas Gregor6a03e342010-04-23 04:16:32 +00003238 return Scalar.EmitCompoundAssignLValue(E, &ScalarExprEmitter::Emit##Op, \
Daniel Dunbard7f7d082010-06-29 22:00:45 +00003239 Result)
Douglas Gregor6a03e342010-04-23 04:16:32 +00003240 COMPOUND_OP(Mul);
3241 COMPOUND_OP(Div);
3242 COMPOUND_OP(Rem);
3243 COMPOUND_OP(Add);
3244 COMPOUND_OP(Sub);
3245 COMPOUND_OP(Shl);
3246 COMPOUND_OP(Shr);
3247 COMPOUND_OP(And);
3248 COMPOUND_OP(Xor);
3249 COMPOUND_OP(Or);
3250#undef COMPOUND_OP
3251
John McCall2de56d12010-08-25 11:45:40 +00003252 case BO_PtrMemD:
3253 case BO_PtrMemI:
3254 case BO_Mul:
3255 case BO_Div:
3256 case BO_Rem:
3257 case BO_Add:
3258 case BO_Sub:
3259 case BO_Shl:
3260 case BO_Shr:
3261 case BO_LT:
3262 case BO_GT:
3263 case BO_LE:
3264 case BO_GE:
3265 case BO_EQ:
3266 case BO_NE:
3267 case BO_And:
3268 case BO_Xor:
3269 case BO_Or:
3270 case BO_LAnd:
3271 case BO_LOr:
3272 case BO_Assign:
3273 case BO_Comma:
David Blaikieb219cfc2011-09-23 05:06:16 +00003274 llvm_unreachable("Not valid compound assignment operators");
Douglas Gregor6a03e342010-04-23 04:16:32 +00003275 }
3276
3277 llvm_unreachable("Unhandled compound assignment operator");
3278}