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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 McCall183700f2009-09-21 23:43:11 +0000778 SrcTy = SrcTy->getAs<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());
Douglas Gregor575a1c92011-05-20 16:38:50 +0000989 bool IdxSigned = E->getIdx()->getType()->isSignedIntegerOrEnumerationType();
Chris Lattner77b89b82010-06-27 07:15:29 +0000990 Idx = Builder.CreateIntCast(Idx, CGF.Int32Ty, IdxSigned, "vecidxcast");
Chris Lattner7f02f722007-08-24 05:35:26 +0000991 return Builder.CreateExtractElement(Base, Idx, "vecext");
992}
993
Nate Begeman0533b302009-10-18 20:10:40 +0000994static llvm::Constant *getMaskElt(llvm::ShuffleVectorInst *SVI, unsigned Idx,
Chris Lattner2acc6e32011-07-18 04:24:23 +0000995 unsigned Off, llvm::Type *I32Ty) {
Nate Begeman0533b302009-10-18 20:10:40 +0000996 int MV = SVI->getMaskValue(Idx);
997 if (MV == -1)
998 return llvm::UndefValue::get(I32Ty);
999 return llvm::ConstantInt::get(I32Ty, Off+MV);
1000}
1001
1002Value *ScalarExprEmitter::VisitInitListExpr(InitListExpr *E) {
1003 bool Ignore = TestAndClearIgnoreResultAssign();
1004 (void)Ignore;
1005 assert (Ignore == false && "init list ignored");
1006 unsigned NumInitElements = E->getNumInits();
1007
1008 if (E->hadArrayRangeDesignator())
1009 CGF.ErrorUnsupported(E, "GNU array range designator extension");
1010
Chris Lattner2acc6e32011-07-18 04:24:23 +00001011 llvm::VectorType *VType =
Nate Begeman0533b302009-10-18 20:10:40 +00001012 dyn_cast<llvm::VectorType>(ConvertType(E->getType()));
1013
Sebastian Redlcea8d962011-09-24 17:48:14 +00001014 if (!VType) {
1015 if (NumInitElements == 0) {
1016 // C++11 value-initialization for the scalar.
1017 return EmitNullValue(E->getType());
1018 }
1019 // We have a scalar in braces. Just use the first element.
Nate Begeman0533b302009-10-18 20:10:40 +00001020 return Visit(E->getInit(0));
Sebastian Redlcea8d962011-09-24 17:48:14 +00001021 }
Nate Begeman0533b302009-10-18 20:10:40 +00001022
1023 unsigned ResElts = VType->getNumElements();
Nate Begeman0533b302009-10-18 20:10:40 +00001024
1025 // Loop over initializers collecting the Value for each, and remembering
1026 // whether the source was swizzle (ExtVectorElementExpr). This will allow
1027 // us to fold the shuffle for the swizzle into the shuffle for the vector
1028 // initializer, since LLVM optimizers generally do not want to touch
1029 // shuffles.
1030 unsigned CurIdx = 0;
1031 bool VIsUndefShuffle = false;
1032 llvm::Value *V = llvm::UndefValue::get(VType);
1033 for (unsigned i = 0; i != NumInitElements; ++i) {
1034 Expr *IE = E->getInit(i);
1035 Value *Init = Visit(IE);
Chris Lattner5f9e2722011-07-23 10:55:15 +00001036 SmallVector<llvm::Constant*, 16> Args;
Nate Begeman0533b302009-10-18 20:10:40 +00001037
Chris Lattner2acc6e32011-07-18 04:24:23 +00001038 llvm::VectorType *VVT = dyn_cast<llvm::VectorType>(Init->getType());
Nate Begeman0533b302009-10-18 20:10:40 +00001039
1040 // Handle scalar elements. If the scalar initializer is actually one
1041 // element of a different vector of the same width, use shuffle instead of
1042 // extract+insert.
1043 if (!VVT) {
1044 if (isa<ExtVectorElementExpr>(IE)) {
1045 llvm::ExtractElementInst *EI = cast<llvm::ExtractElementInst>(Init);
1046
1047 if (EI->getVectorOperandType()->getNumElements() == ResElts) {
1048 llvm::ConstantInt *C = cast<llvm::ConstantInt>(EI->getIndexOperand());
1049 Value *LHS = 0, *RHS = 0;
1050 if (CurIdx == 0) {
1051 // insert into undef -> shuffle (src, undef)
1052 Args.push_back(C);
Benjamin Kramer14c59822012-02-14 12:06:21 +00001053 Args.resize(ResElts, llvm::UndefValue::get(CGF.Int32Ty));
Nate Begeman0533b302009-10-18 20:10:40 +00001054
1055 LHS = EI->getVectorOperand();
1056 RHS = V;
1057 VIsUndefShuffle = true;
1058 } else if (VIsUndefShuffle) {
1059 // insert into undefshuffle && size match -> shuffle (v, src)
1060 llvm::ShuffleVectorInst *SVV = cast<llvm::ShuffleVectorInst>(V);
1061 for (unsigned j = 0; j != CurIdx; ++j)
Chris Lattner77b89b82010-06-27 07:15:29 +00001062 Args.push_back(getMaskElt(SVV, j, 0, CGF.Int32Ty));
Chris Lattner48431f92011-04-19 22:55:03 +00001063 Args.push_back(Builder.getInt32(ResElts + C->getZExtValue()));
Benjamin Kramer14c59822012-02-14 12:06:21 +00001064 Args.resize(ResElts, llvm::UndefValue::get(CGF.Int32Ty));
1065
Nate Begeman0533b302009-10-18 20:10:40 +00001066 LHS = cast<llvm::ShuffleVectorInst>(V)->getOperand(0);
1067 RHS = EI->getVectorOperand();
1068 VIsUndefShuffle = false;
1069 }
1070 if (!Args.empty()) {
Chris Lattnerfb018d12011-02-15 00:14:06 +00001071 llvm::Constant *Mask = llvm::ConstantVector::get(Args);
Nate Begeman0533b302009-10-18 20:10:40 +00001072 V = Builder.CreateShuffleVector(LHS, RHS, Mask);
1073 ++CurIdx;
1074 continue;
1075 }
1076 }
1077 }
Chris Lattner48431f92011-04-19 22:55:03 +00001078 V = Builder.CreateInsertElement(V, Init, Builder.getInt32(CurIdx),
1079 "vecinit");
Nate Begeman0533b302009-10-18 20:10:40 +00001080 VIsUndefShuffle = false;
1081 ++CurIdx;
1082 continue;
1083 }
1084
1085 unsigned InitElts = VVT->getNumElements();
1086
1087 // If the initializer is an ExtVecEltExpr (a swizzle), and the swizzle's
1088 // input is the same width as the vector being constructed, generate an
1089 // optimized shuffle of the swizzle input into the result.
Nate Begemana99f0832009-10-25 02:26:01 +00001090 unsigned Offset = (CurIdx == 0) ? 0 : ResElts;
Nate Begeman0533b302009-10-18 20:10:40 +00001091 if (isa<ExtVectorElementExpr>(IE)) {
1092 llvm::ShuffleVectorInst *SVI = cast<llvm::ShuffleVectorInst>(Init);
1093 Value *SVOp = SVI->getOperand(0);
Chris Lattner2acc6e32011-07-18 04:24:23 +00001094 llvm::VectorType *OpTy = cast<llvm::VectorType>(SVOp->getType());
Nate Begeman0533b302009-10-18 20:10:40 +00001095
1096 if (OpTy->getNumElements() == ResElts) {
Nate Begeman0533b302009-10-18 20:10:40 +00001097 for (unsigned j = 0; j != CurIdx; ++j) {
1098 // If the current vector initializer is a shuffle with undef, merge
1099 // this shuffle directly into it.
1100 if (VIsUndefShuffle) {
1101 Args.push_back(getMaskElt(cast<llvm::ShuffleVectorInst>(V), j, 0,
Chris Lattner77b89b82010-06-27 07:15:29 +00001102 CGF.Int32Ty));
Nate Begeman0533b302009-10-18 20:10:40 +00001103 } else {
Chris Lattner48431f92011-04-19 22:55:03 +00001104 Args.push_back(Builder.getInt32(j));
Nate Begeman0533b302009-10-18 20:10:40 +00001105 }
1106 }
1107 for (unsigned j = 0, je = InitElts; j != je; ++j)
Chris Lattner77b89b82010-06-27 07:15:29 +00001108 Args.push_back(getMaskElt(SVI, j, Offset, CGF.Int32Ty));
Benjamin Kramer14c59822012-02-14 12:06:21 +00001109 Args.resize(ResElts, llvm::UndefValue::get(CGF.Int32Ty));
Nate Begeman0533b302009-10-18 20:10:40 +00001110
1111 if (VIsUndefShuffle)
1112 V = cast<llvm::ShuffleVectorInst>(V)->getOperand(0);
1113
1114 Init = SVOp;
1115 }
1116 }
1117
1118 // Extend init to result vector length, and then shuffle its contribution
1119 // to the vector initializer into V.
1120 if (Args.empty()) {
1121 for (unsigned j = 0; j != InitElts; ++j)
Chris Lattner48431f92011-04-19 22:55:03 +00001122 Args.push_back(Builder.getInt32(j));
Benjamin Kramer14c59822012-02-14 12:06:21 +00001123 Args.resize(ResElts, llvm::UndefValue::get(CGF.Int32Ty));
Chris Lattnerfb018d12011-02-15 00:14:06 +00001124 llvm::Constant *Mask = llvm::ConstantVector::get(Args);
Nate Begeman0533b302009-10-18 20:10:40 +00001125 Init = Builder.CreateShuffleVector(Init, llvm::UndefValue::get(VVT),
Nate Begemana99f0832009-10-25 02:26:01 +00001126 Mask, "vext");
Nate Begeman0533b302009-10-18 20:10:40 +00001127
1128 Args.clear();
1129 for (unsigned j = 0; j != CurIdx; ++j)
Chris Lattner48431f92011-04-19 22:55:03 +00001130 Args.push_back(Builder.getInt32(j));
Nate Begeman0533b302009-10-18 20:10:40 +00001131 for (unsigned j = 0; j != InitElts; ++j)
Chris Lattner48431f92011-04-19 22:55:03 +00001132 Args.push_back(Builder.getInt32(j+Offset));
Benjamin Kramer14c59822012-02-14 12:06:21 +00001133 Args.resize(ResElts, llvm::UndefValue::get(CGF.Int32Ty));
Nate Begeman0533b302009-10-18 20:10:40 +00001134 }
1135
1136 // If V is undef, make sure it ends up on the RHS of the shuffle to aid
1137 // merging subsequent shuffles into this one.
1138 if (CurIdx == 0)
1139 std::swap(V, Init);
Chris Lattnerfb018d12011-02-15 00:14:06 +00001140 llvm::Constant *Mask = llvm::ConstantVector::get(Args);
Nate Begeman0533b302009-10-18 20:10:40 +00001141 V = Builder.CreateShuffleVector(V, Init, Mask, "vecinit");
1142 VIsUndefShuffle = isa<llvm::UndefValue>(Init);
1143 CurIdx += InitElts;
1144 }
1145
1146 // FIXME: evaluate codegen vs. shuffling against constant null vector.
1147 // Emit remaining default initializers.
Chris Lattner2acc6e32011-07-18 04:24:23 +00001148 llvm::Type *EltTy = VType->getElementType();
Nate Begeman0533b302009-10-18 20:10:40 +00001149
1150 // Emit remaining default initializers
1151 for (/* Do not initialize i*/; CurIdx < ResElts; ++CurIdx) {
Chris Lattner48431f92011-04-19 22:55:03 +00001152 Value *Idx = Builder.getInt32(CurIdx);
Nate Begeman0533b302009-10-18 20:10:40 +00001153 llvm::Value *Init = llvm::Constant::getNullValue(EltTy);
1154 V = Builder.CreateInsertElement(V, Init, Idx, "vecinit");
1155 }
1156 return V;
1157}
1158
Anders Carlssona3697c92009-11-23 17:57:54 +00001159static bool ShouldNullCheckClassCastValue(const CastExpr *CE) {
1160 const Expr *E = CE->getSubExpr();
John McCall23cba802010-03-30 23:58:03 +00001161
John McCall2de56d12010-08-25 11:45:40 +00001162 if (CE->getCastKind() == CK_UncheckedDerivedToBase)
John McCall23cba802010-03-30 23:58:03 +00001163 return false;
Anders Carlssona3697c92009-11-23 17:57:54 +00001164
1165 if (isa<CXXThisExpr>(E)) {
1166 // We always assume that 'this' is never null.
1167 return false;
1168 }
1169
1170 if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(CE)) {
Sebastian Redl906082e2010-07-20 04:20:21 +00001171 // And that glvalue casts are never null.
John McCall5baba9d2010-08-25 10:28:54 +00001172 if (ICE->getValueKind() != VK_RValue)
Anders Carlssona3697c92009-11-23 17:57:54 +00001173 return false;
1174 }
1175
1176 return true;
1177}
1178
Chris Lattner7f02f722007-08-24 05:35:26 +00001179// VisitCastExpr - Emit code for an explicit or implicit cast. Implicit casts
1180// have to handle a more broad range of conversions than explicit casts, as they
1181// handle things like function to ptr-to-function decay etc.
John McCallbc8d40d2011-06-24 21:55:10 +00001182Value *ScalarExprEmitter::VisitCastExpr(CastExpr *CE) {
Eli Friedmand8889622009-11-27 04:41:50 +00001183 Expr *E = CE->getSubExpr();
Anders Carlsson592a2bb2009-09-22 22:00:46 +00001184 QualType DestTy = CE->getType();
John McCall2de56d12010-08-25 11:45:40 +00001185 CastKind Kind = CE->getCastKind();
Anders Carlsson592a2bb2009-09-22 22:00:46 +00001186
Mike Stump7f79f9b2009-05-29 15:46:01 +00001187 if (!DestTy->isVoidType())
1188 TestAndClearIgnoreResultAssign();
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001189
Eli Friedman8c3e7e72009-11-27 02:07:44 +00001190 // Since almost all cast kinds apply to scalars, this switch doesn't have
1191 // a default case, so the compiler will warn on a missing case. The cases
1192 // are in the same order as in the CastKind enum.
Anders Carlssone9776242009-08-24 18:26:39 +00001193 switch (Kind) {
John McCalldaa8e4e2010-11-15 09:13:47 +00001194 case CK_Dependent: llvm_unreachable("dependent cast kind in IR gen!");
Eli Friedmana6c66ce2012-08-31 00:14:07 +00001195 case CK_BuiltinFnToFnPtr:
1196 llvm_unreachable("builtin functions are handled elsewhere");
1197
John McCall2de56d12010-08-25 11:45:40 +00001198 case CK_LValueBitCast:
1199 case CK_ObjCObjectLValueCast: {
Douglas Gregore39a3892010-07-13 23:17:26 +00001200 Value *V = EmitLValue(E).getAddress();
1201 V = Builder.CreateBitCast(V,
1202 ConvertType(CGF.getContext().getPointerType(DestTy)));
Eli Friedmand71f4422011-12-19 23:03:09 +00001203 return EmitLoadOfLValue(CGF.MakeNaturalAlignAddrLValue(V, DestTy));
Douglas Gregore39a3892010-07-13 23:17:26 +00001204 }
John McCalldc05b112011-09-10 01:16:55 +00001205
John McCall1d9b3b22011-09-09 05:25:32 +00001206 case CK_CPointerToObjCPointerCast:
1207 case CK_BlockPointerToObjCPointerCast:
John McCall2de56d12010-08-25 11:45:40 +00001208 case CK_AnyPointerToBlockPointerCast:
1209 case CK_BitCast: {
Anders Carlssoncb3c3082009-09-01 20:52:42 +00001210 Value *Src = Visit(const_cast<Expr*>(E));
1211 return Builder.CreateBitCast(Src, ConvertType(DestTy));
1212 }
David Chisnall7a7ee302012-01-16 17:27:18 +00001213 case CK_AtomicToNonAtomic:
1214 case CK_NonAtomicToAtomic:
John McCall2de56d12010-08-25 11:45:40 +00001215 case CK_NoOp:
1216 case CK_UserDefinedConversion:
Eli Friedmanad35a832009-11-16 21:33:53 +00001217 return Visit(const_cast<Expr*>(E));
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001218
John McCall2de56d12010-08-25 11:45:40 +00001219 case CK_BaseToDerived: {
Jordan Rose041ce8e2012-10-03 01:08:28 +00001220 const CXXRecordDecl *DerivedClassDecl = DestTy->getPointeeCXXRecordDecl();
1221 assert(DerivedClassDecl && "BaseToDerived arg isn't a C++ object pointer!");
1222
1223 return CGF.GetAddressOfDerivedClass(Visit(E), DerivedClassDecl,
John McCallf871d0c2010-08-07 06:22:56 +00001224 CE->path_begin(), CE->path_end(),
Anders Carlssona04efdf2010-04-24 21:23:59 +00001225 ShouldNullCheckClassCastValue(CE));
Anders Carlssona3697c92009-11-23 17:57:54 +00001226 }
John McCall2de56d12010-08-25 11:45:40 +00001227 case CK_UncheckedDerivedToBase:
1228 case CK_DerivedToBase: {
Jordan Rose041ce8e2012-10-03 01:08:28 +00001229 const CXXRecordDecl *DerivedClassDecl =
1230 E->getType()->getPointeeCXXRecordDecl();
1231 assert(DerivedClassDecl && "DerivedToBase arg isn't a C++ object pointer!");
Anders Carlsson191dfe92009-09-12 04:57:16 +00001232
Anders Carlsson34a2d382010-04-24 21:06:20 +00001233 return CGF.GetAddressOfBaseClass(Visit(E), DerivedClassDecl,
John McCallf871d0c2010-08-07 06:22:56 +00001234 CE->path_begin(), CE->path_end(),
Anders Carlsson34a2d382010-04-24 21:06:20 +00001235 ShouldNullCheckClassCastValue(CE));
Anders Carlsson191dfe92009-09-12 04:57:16 +00001236 }
Anders Carlsson575b3742011-04-11 02:03:26 +00001237 case CK_Dynamic: {
Eli Friedman8c3e7e72009-11-27 02:07:44 +00001238 Value *V = Visit(const_cast<Expr*>(E));
1239 const CXXDynamicCastExpr *DCE = cast<CXXDynamicCastExpr>(CE);
1240 return CGF.EmitDynamicCast(V, DCE);
1241 }
Eli Friedmand8889622009-11-27 04:41:50 +00001242
John McCall2de56d12010-08-25 11:45:40 +00001243 case CK_ArrayToPointerDecay: {
Eli Friedmanad35a832009-11-16 21:33:53 +00001244 assert(E->getType()->isArrayType() &&
1245 "Array to pointer decay must have array source type!");
1246
1247 Value *V = EmitLValue(E).getAddress(); // Bitfields can't be arrays.
1248
1249 // Note that VLA pointers are always decayed, so we don't need to do
1250 // anything here.
1251 if (!E->getType()->isVariableArrayType()) {
1252 assert(isa<llvm::PointerType>(V->getType()) && "Expected pointer");
1253 assert(isa<llvm::ArrayType>(cast<llvm::PointerType>(V->getType())
1254 ->getElementType()) &&
1255 "Expected pointer to array");
1256 V = Builder.CreateStructGEP(V, 0, "arraydecay");
1257 }
1258
Chris Lattner410b12e2011-07-20 04:31:01 +00001259 // Make sure the array decay ends up being the right type. This matters if
1260 // the array type was of an incomplete type.
Chris Lattnercb8095f2011-07-20 04:59:57 +00001261 return CGF.Builder.CreateBitCast(V, ConvertType(CE->getType()));
Eli Friedmanad35a832009-11-16 21:33:53 +00001262 }
John McCall2de56d12010-08-25 11:45:40 +00001263 case CK_FunctionToPointerDecay:
Eli Friedmanad35a832009-11-16 21:33:53 +00001264 return EmitLValue(E).getAddress();
1265
John McCall404cd162010-11-13 01:35:44 +00001266 case CK_NullToPointer:
1267 if (MustVisitNullValue(E))
1268 (void) Visit(E);
1269
1270 return llvm::ConstantPointerNull::get(
1271 cast<llvm::PointerType>(ConvertType(DestTy)));
1272
John McCall2de56d12010-08-25 11:45:40 +00001273 case CK_NullToMemberPointer: {
John McCall404cd162010-11-13 01:35:44 +00001274 if (MustVisitNullValue(E))
John McCalld608cdb2010-08-22 10:59:02 +00001275 (void) Visit(E);
1276
John McCall0bab0cd2010-08-23 01:21:21 +00001277 const MemberPointerType *MPT = CE->getType()->getAs<MemberPointerType>();
1278 return CGF.CGM.getCXXABI().EmitNullMemberPointer(MPT);
1279 }
Anders Carlsson191dfe92009-09-12 04:57:16 +00001280
John McCall4d4e5c12012-02-15 01:22:51 +00001281 case CK_ReinterpretMemberPointer:
John McCall2de56d12010-08-25 11:45:40 +00001282 case CK_BaseToDerivedMemberPointer:
1283 case CK_DerivedToBaseMemberPointer: {
Eli Friedmand8889622009-11-27 04:41:50 +00001284 Value *Src = Visit(E);
John McCalld608cdb2010-08-22 10:59:02 +00001285
1286 // Note that the AST doesn't distinguish between checked and
1287 // unchecked member pointer conversions, so we always have to
1288 // implement checked conversions here. This is inefficient when
1289 // actual control flow may be required in order to perform the
1290 // check, which it is for data member pointers (but not member
1291 // function pointers on Itanium and ARM).
John McCall0bab0cd2010-08-23 01:21:21 +00001292 return CGF.CGM.getCXXABI().EmitMemberPointerConversion(CGF, CE, Src);
Eli Friedmand8889622009-11-27 04:41:50 +00001293 }
John McCallf85e1932011-06-15 23:02:42 +00001294
John McCall33e56f32011-09-10 06:18:15 +00001295 case CK_ARCProduceObject:
John McCallf85e1932011-06-15 23:02:42 +00001296 return CGF.EmitARCRetainScalarExpr(E);
John McCall33e56f32011-09-10 06:18:15 +00001297 case CK_ARCConsumeObject:
John McCallf85e1932011-06-15 23:02:42 +00001298 return CGF.EmitObjCConsumeObject(E->getType(), Visit(E));
John McCall33e56f32011-09-10 06:18:15 +00001299 case CK_ARCReclaimReturnedObject: {
John McCall7e5e5f42011-07-07 06:58:02 +00001300 llvm::Value *value = Visit(E);
1301 value = CGF.EmitARCRetainAutoreleasedReturnValue(value);
1302 return CGF.EmitObjCConsumeObject(E->getType(), value);
1303 }
John McCall348f16f2011-10-04 06:23:45 +00001304 case CK_ARCExtendBlockObject:
1305 return CGF.EmitARCExtendBlockObject(E);
John McCallf85e1932011-06-15 23:02:42 +00001306
Douglas Gregorac1303e2012-02-22 05:02:47 +00001307 case CK_CopyAndAutoreleaseBlockObject:
Eli Friedmancae40c42012-02-28 01:08:45 +00001308 return CGF.EmitBlockCopyAndAutorelease(Visit(E), E->getType());
Douglas Gregorac1303e2012-02-22 05:02:47 +00001309
John McCall2bb5d002010-11-13 09:02:35 +00001310 case CK_FloatingRealToComplex:
1311 case CK_FloatingComplexCast:
1312 case CK_IntegralRealToComplex:
1313 case CK_IntegralComplexCast:
John McCallf3ea8cf2010-11-14 08:17:51 +00001314 case CK_IntegralComplexToFloatingComplex:
1315 case CK_FloatingComplexToIntegralComplex:
John McCall2de56d12010-08-25 11:45:40 +00001316 case CK_ConstructorConversion:
John McCall61ad0e62010-11-16 06:21:14 +00001317 case CK_ToUnion:
1318 llvm_unreachable("scalar cast to non-scalar value");
John McCallf6a16482010-12-04 03:47:34 +00001319
John McCall0ae287a2010-12-01 04:43:34 +00001320 case CK_LValueToRValue:
1321 assert(CGF.getContext().hasSameUnqualifiedType(E->getType(), DestTy));
John McCallf6a16482010-12-04 03:47:34 +00001322 assert(E->isGLValue() && "lvalue-to-rvalue applied to r-value!");
John McCall0ae287a2010-12-01 04:43:34 +00001323 return Visit(const_cast<Expr*>(E));
Eli Friedman8c3e7e72009-11-27 02:07:44 +00001324
John McCall2de56d12010-08-25 11:45:40 +00001325 case CK_IntegralToPointer: {
Anders Carlsson7f9e6462009-09-15 04:48:33 +00001326 Value *Src = Visit(const_cast<Expr*>(E));
Daniel Dunbar89f176d2010-08-25 03:32:38 +00001327
Anders Carlsson82debc72009-10-18 18:12:03 +00001328 // First, convert to the correct width so that we control the kind of
1329 // extension.
Chris Lattner2acc6e32011-07-18 04:24:23 +00001330 llvm::Type *MiddleTy = CGF.IntPtrTy;
Douglas Gregor575a1c92011-05-20 16:38:50 +00001331 bool InputSigned = E->getType()->isSignedIntegerOrEnumerationType();
Anders Carlsson82debc72009-10-18 18:12:03 +00001332 llvm::Value* IntResult =
1333 Builder.CreateIntCast(Src, MiddleTy, InputSigned, "conv");
Daniel Dunbar89f176d2010-08-25 03:32:38 +00001334
Anders Carlsson82debc72009-10-18 18:12:03 +00001335 return Builder.CreateIntToPtr(IntResult, ConvertType(DestTy));
Anders Carlsson7f9e6462009-09-15 04:48:33 +00001336 }
Eli Friedman65949422011-06-25 02:58:47 +00001337 case CK_PointerToIntegral:
1338 assert(!DestTy->isBooleanType() && "bool should use PointerToBool");
1339 return Builder.CreatePtrToInt(Visit(E), ConvertType(DestTy));
Daniel Dunbar89f176d2010-08-25 03:32:38 +00001340
John McCall2de56d12010-08-25 11:45:40 +00001341 case CK_ToVoid: {
John McCall2a416372010-12-05 02:00:02 +00001342 CGF.EmitIgnoredExpr(E);
Eli Friedmanad35a832009-11-16 21:33:53 +00001343 return 0;
1344 }
John McCall2de56d12010-08-25 11:45:40 +00001345 case CK_VectorSplat: {
Chris Lattner2acc6e32011-07-18 04:24:23 +00001346 llvm::Type *DstTy = ConvertType(DestTy);
Eli Friedmanad35a832009-11-16 21:33:53 +00001347 Value *Elt = Visit(const_cast<Expr*>(E));
Craig Topper5fa56082012-02-06 05:05:50 +00001348 Elt = EmitScalarConversion(Elt, E->getType(),
1349 DestTy->getAs<VectorType>()->getElementType());
Eli Friedmanad35a832009-11-16 21:33:53 +00001350
Eli Friedmanad35a832009-11-16 21:33:53 +00001351 // Splat the element across to all elements
Eli Friedmanad35a832009-11-16 21:33:53 +00001352 unsigned NumElements = cast<llvm::VectorType>(DstTy)->getNumElements();
Benjamin Kramer0b227082013-01-01 20:08:10 +00001353 return Builder.CreateVectorSplat(NumElements, Elt, "splat");;
Eli Friedmanad35a832009-11-16 21:33:53 +00001354 }
John McCalldaa8e4e2010-11-15 09:13:47 +00001355
John McCall2de56d12010-08-25 11:45:40 +00001356 case CK_IntegralCast:
1357 case CK_IntegralToFloating:
1358 case CK_FloatingToIntegral:
1359 case CK_FloatingCast:
Eli Friedmand8889622009-11-27 04:41:50 +00001360 return EmitScalarConversion(Visit(E), E->getType(), DestTy);
John McCalldaa8e4e2010-11-15 09:13:47 +00001361 case CK_IntegralToBoolean:
1362 return EmitIntToBoolConversion(Visit(E));
1363 case CK_PointerToBoolean:
1364 return EmitPointerToBoolConversion(Visit(E));
1365 case CK_FloatingToBoolean:
1366 return EmitFloatToBoolConversion(Visit(E));
John McCall2de56d12010-08-25 11:45:40 +00001367 case CK_MemberPointerToBoolean: {
John McCall0bab0cd2010-08-23 01:21:21 +00001368 llvm::Value *MemPtr = Visit(E);
1369 const MemberPointerType *MPT = E->getType()->getAs<MemberPointerType>();
1370 return CGF.CGM.getCXXABI().EmitMemberPointerIsNotNull(CGF, MemPtr, MPT);
Anders Carlssone9776242009-08-24 18:26:39 +00001371 }
John McCallf3ea8cf2010-11-14 08:17:51 +00001372
1373 case CK_FloatingComplexToReal:
1374 case CK_IntegralComplexToReal:
John McCallb418d742010-11-16 10:08:07 +00001375 return CGF.EmitComplexExpr(E, false, true).first;
John McCallf3ea8cf2010-11-14 08:17:51 +00001376
1377 case CK_FloatingComplexToBoolean:
1378 case CK_IntegralComplexToBoolean: {
John McCallb418d742010-11-16 10:08:07 +00001379 CodeGenFunction::ComplexPairTy V = CGF.EmitComplexExpr(E);
John McCallf3ea8cf2010-11-14 08:17:51 +00001380
1381 // TODO: kill this function off, inline appropriate case here
1382 return EmitComplexToScalarConversion(V, E->getType(), DestTy);
1383 }
1384
Guy Benyeie6b9d802013-01-20 12:31:11 +00001385 case CK_ZeroToOCLEvent: {
1386 assert(DestTy->isEventT() && "CK_ZeroToOCLEvent cast on non event type");
1387 return llvm::Constant::getNullValue(ConvertType(DestTy));
1388 }
1389
John McCall0bab0cd2010-08-23 01:21:21 +00001390 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001391
John McCall61ad0e62010-11-16 06:21:14 +00001392 llvm_unreachable("unknown scalar cast");
Chris Lattner7f02f722007-08-24 05:35:26 +00001393}
1394
Chris Lattner33793202007-08-31 22:09:40 +00001395Value *ScalarExprEmitter::VisitStmtExpr(const StmtExpr *E) {
John McCall150b4622011-01-26 04:00:11 +00001396 CodeGenFunction::StmtExprEvaluation eval(CGF);
1397 return CGF.EmitCompoundStmt(*E->getSubStmt(), !E->getType()->isVoidType())
1398 .getScalarVal();
Chris Lattner33793202007-08-31 22:09:40 +00001399}
1400
Chris Lattner7f02f722007-08-24 05:35:26 +00001401//===----------------------------------------------------------------------===//
1402// Unary Operators
1403//===----------------------------------------------------------------------===//
1404
Chris Lattner8c11a652010-06-26 22:09:34 +00001405llvm::Value *ScalarExprEmitter::
Anton Yartsev683564a2011-02-07 02:17:30 +00001406EmitAddConsiderOverflowBehavior(const UnaryOperator *E,
1407 llvm::Value *InVal,
1408 llvm::Value *NextVal, bool IsInc) {
Richard Smith7edf9e32012-11-01 22:30:59 +00001409 switch (CGF.getLangOpts().getSignedOverflowBehavior()) {
Anton Yartsev683564a2011-02-07 02:17:30 +00001410 case LangOptions::SOB_Defined:
1411 return Builder.CreateAdd(InVal, NextVal, IsInc ? "inc" : "dec");
Richard Smith9d3e2262012-08-25 00:32:28 +00001412 case LangOptions::SOB_Undefined:
Will Dietz4f45bc02013-01-18 11:30:38 +00001413 if (!CGF.SanOpts->SignedIntegerOverflow)
Richard Smith9d3e2262012-08-25 00:32:28 +00001414 return Builder.CreateNSWAdd(InVal, NextVal, IsInc ? "inc" : "dec");
1415 // Fall through.
Anton Yartsev683564a2011-02-07 02:17:30 +00001416 case LangOptions::SOB_Trapping:
1417 BinOpInfo BinOp;
1418 BinOp.LHS = InVal;
1419 BinOp.RHS = NextVal;
1420 BinOp.Ty = E->getType();
1421 BinOp.Opcode = BO_Add;
Benjamin Kramerddc57332012-10-03 20:58:04 +00001422 BinOp.FPContractable = false;
Anton Yartsev683564a2011-02-07 02:17:30 +00001423 BinOp.E = E;
1424 return EmitOverflowCheckedBinOp(BinOp);
Anton Yartsev683564a2011-02-07 02:17:30 +00001425 }
David Blaikieb219cfc2011-09-23 05:06:16 +00001426 llvm_unreachable("Unknown SignedOverflowBehaviorTy");
Anton Yartsev683564a2011-02-07 02:17:30 +00001427}
1428
John McCall5936e332011-02-15 09:22:45 +00001429llvm::Value *
1430ScalarExprEmitter::EmitScalarPrePostIncDec(const UnaryOperator *E, LValue LV,
1431 bool isInc, bool isPre) {
Chris Lattner8c11a652010-06-26 22:09:34 +00001432
John McCall5936e332011-02-15 09:22:45 +00001433 QualType type = E->getSubExpr()->getType();
John McCall545d9962011-06-25 02:11:03 +00001434 llvm::Value *value = EmitLoadOfLValue(LV);
John McCall5936e332011-02-15 09:22:45 +00001435 llvm::Value *input = value;
David Chisnall7a7ee302012-01-16 17:27:18 +00001436 llvm::PHINode *atomicPHI = 0;
Anton Yartsev683564a2011-02-07 02:17:30 +00001437
John McCall5936e332011-02-15 09:22:45 +00001438 int amount = (isInc ? 1 : -1);
1439
David Chisnall7a7ee302012-01-16 17:27:18 +00001440 if (const AtomicType *atomicTy = type->getAs<AtomicType>()) {
1441 llvm::BasicBlock *startBB = Builder.GetInsertBlock();
1442 llvm::BasicBlock *opBB = CGF.createBasicBlock("atomic_op", CGF.CurFn);
1443 Builder.CreateBr(opBB);
1444 Builder.SetInsertPoint(opBB);
1445 atomicPHI = Builder.CreatePHI(value->getType(), 2);
1446 atomicPHI->addIncoming(value, startBB);
1447 type = atomicTy->getValueType();
1448 value = atomicPHI;
1449 }
1450
John McCall5936e332011-02-15 09:22:45 +00001451 // Special case of integer increment that we have to check first: bool++.
1452 // Due to promotion rules, we get:
1453 // bool++ -> bool = bool + 1
1454 // -> bool = (int)bool + 1
1455 // -> bool = ((int)bool + 1 != 0)
1456 // An interesting aspect of this is that increment is always true.
1457 // Decrement does not have this property.
1458 if (isInc && type->isBooleanType()) {
1459 value = Builder.getTrue();
1460
1461 // Most common case by far: integer increment.
1462 } else if (type->isIntegerType()) {
1463
Michael Liao36d5cea2012-08-28 16:55:13 +00001464 llvm::Value *amt = llvm::ConstantInt::get(value->getType(), amount, true);
John McCall5936e332011-02-15 09:22:45 +00001465
Eli Friedmanfa0b4092011-03-02 01:49:12 +00001466 // Note that signed integer inc/dec with width less than int can't
1467 // overflow because of promotion rules; we're just eliding a few steps here.
Will Dietzb8540362012-11-27 15:01:55 +00001468 if (value->getType()->getPrimitiveSizeInBits() >=
1469 CGF.IntTy->getBitWidth() &&
1470 type->isSignedIntegerOrEnumerationType()) {
John McCall5936e332011-02-15 09:22:45 +00001471 value = EmitAddConsiderOverflowBehavior(E, value, amt, isInc);
Will Dietzb8540362012-11-27 15:01:55 +00001472 } else if (value->getType()->getPrimitiveSizeInBits() >=
Will Dietz4f45bc02013-01-18 11:30:38 +00001473 CGF.IntTy->getBitWidth() && type->isUnsignedIntegerType() &&
1474 CGF.SanOpts->UnsignedIntegerOverflow) {
Will Dietzb8540362012-11-27 15:01:55 +00001475 BinOpInfo BinOp;
1476 BinOp.LHS = value;
1477 BinOp.RHS = llvm::ConstantInt::get(value->getType(), 1, false);
1478 BinOp.Ty = E->getType();
1479 BinOp.Opcode = isInc ? BO_Add : BO_Sub;
1480 BinOp.FPContractable = false;
1481 BinOp.E = E;
1482 value = EmitOverflowCheckedBinOp(BinOp);
1483 } else
John McCall5936e332011-02-15 09:22:45 +00001484 value = Builder.CreateAdd(value, amt, isInc ? "inc" : "dec");
1485
1486 // Next most common: pointer increment.
1487 } else if (const PointerType *ptr = type->getAs<PointerType>()) {
1488 QualType type = ptr->getPointeeType();
1489
1490 // VLA types don't have constant size.
John McCall913dab22011-06-25 01:32:37 +00001491 if (const VariableArrayType *vla
1492 = CGF.getContext().getAsVariableArrayType(type)) {
1493 llvm::Value *numElts = CGF.getVLASize(vla).first;
John McCallbc8d40d2011-06-24 21:55:10 +00001494 if (!isInc) numElts = Builder.CreateNSWNeg(numElts, "vla.negsize");
Richard Smith7edf9e32012-11-01 22:30:59 +00001495 if (CGF.getLangOpts().isSignedOverflowDefined())
John McCallbc8d40d2011-06-24 21:55:10 +00001496 value = Builder.CreateGEP(value, numElts, "vla.inc");
Chris Lattner2cb42222011-03-01 00:03:48 +00001497 else
John McCallbc8d40d2011-06-24 21:55:10 +00001498 value = Builder.CreateInBoundsGEP(value, numElts, "vla.inc");
John McCall5936e332011-02-15 09:22:45 +00001499
1500 // Arithmetic on function pointers (!) is just +-1.
1501 } else if (type->isFunctionType()) {
Chris Lattner48431f92011-04-19 22:55:03 +00001502 llvm::Value *amt = Builder.getInt32(amount);
John McCall5936e332011-02-15 09:22:45 +00001503
1504 value = CGF.EmitCastToVoidPtr(value);
Richard Smith7edf9e32012-11-01 22:30:59 +00001505 if (CGF.getLangOpts().isSignedOverflowDefined())
Chris Lattner2cb42222011-03-01 00:03:48 +00001506 value = Builder.CreateGEP(value, amt, "incdec.funcptr");
1507 else
1508 value = Builder.CreateInBoundsGEP(value, amt, "incdec.funcptr");
John McCall5936e332011-02-15 09:22:45 +00001509 value = Builder.CreateBitCast(value, input->getType());
1510
1511 // For everything else, we can just do a simple increment.
Anton Yartsev683564a2011-02-07 02:17:30 +00001512 } else {
Chris Lattner48431f92011-04-19 22:55:03 +00001513 llvm::Value *amt = Builder.getInt32(amount);
Richard Smith7edf9e32012-11-01 22:30:59 +00001514 if (CGF.getLangOpts().isSignedOverflowDefined())
Chris Lattner2cb42222011-03-01 00:03:48 +00001515 value = Builder.CreateGEP(value, amt, "incdec.ptr");
1516 else
1517 value = Builder.CreateInBoundsGEP(value, amt, "incdec.ptr");
John McCall5936e332011-02-15 09:22:45 +00001518 }
1519
1520 // Vector increment/decrement.
1521 } else if (type->isVectorType()) {
1522 if (type->hasIntegerRepresentation()) {
1523 llvm::Value *amt = llvm::ConstantInt::get(value->getType(), amount);
1524
Eli Friedmand4b9ee32011-05-06 18:04:18 +00001525 value = Builder.CreateAdd(value, amt, isInc ? "inc" : "dec");
John McCall5936e332011-02-15 09:22:45 +00001526 } else {
1527 value = Builder.CreateFAdd(
1528 value,
1529 llvm::ConstantFP::get(value->getType(), amount),
Anton Yartsev683564a2011-02-07 02:17:30 +00001530 isInc ? "inc" : "dec");
1531 }
Anton Yartsev683564a2011-02-07 02:17:30 +00001532
John McCall5936e332011-02-15 09:22:45 +00001533 // Floating point.
1534 } else if (type->isRealFloatingType()) {
Chris Lattner8c11a652010-06-26 22:09:34 +00001535 // Add the inc/dec to the real part.
John McCall5936e332011-02-15 09:22:45 +00001536 llvm::Value *amt;
Anton Korobeynikovaa4a99b2011-10-14 23:23:15 +00001537
Joey Gouly19dbb202013-01-23 11:56:20 +00001538 if (type->isHalfType() && !CGF.getContext().getLangOpts().NativeHalfType) {
Anton Korobeynikovaa4a99b2011-10-14 23:23:15 +00001539 // Another special case: half FP increment should be done via float
1540 value =
1541 Builder.CreateCall(CGF.CGM.getIntrinsic(llvm::Intrinsic::convert_from_fp16),
1542 input);
1543 }
1544
John McCall5936e332011-02-15 09:22:45 +00001545 if (value->getType()->isFloatTy())
1546 amt = llvm::ConstantFP::get(VMContext,
1547 llvm::APFloat(static_cast<float>(amount)));
1548 else if (value->getType()->isDoubleTy())
1549 amt = llvm::ConstantFP::get(VMContext,
1550 llvm::APFloat(static_cast<double>(amount)));
Chris Lattner8c11a652010-06-26 22:09:34 +00001551 else {
John McCall5936e332011-02-15 09:22:45 +00001552 llvm::APFloat F(static_cast<float>(amount));
Chris Lattner8c11a652010-06-26 22:09:34 +00001553 bool ignored;
1554 F.convert(CGF.Target.getLongDoubleFormat(), llvm::APFloat::rmTowardZero,
1555 &ignored);
John McCall5936e332011-02-15 09:22:45 +00001556 amt = llvm::ConstantFP::get(VMContext, F);
Chris Lattner8c11a652010-06-26 22:09:34 +00001557 }
John McCall5936e332011-02-15 09:22:45 +00001558 value = Builder.CreateFAdd(value, amt, isInc ? "inc" : "dec");
1559
Joey Gouly19dbb202013-01-23 11:56:20 +00001560 if (type->isHalfType() && !CGF.getContext().getLangOpts().NativeHalfType)
Anton Korobeynikovaa4a99b2011-10-14 23:23:15 +00001561 value =
1562 Builder.CreateCall(CGF.CGM.getIntrinsic(llvm::Intrinsic::convert_to_fp16),
1563 value);
1564
John McCall5936e332011-02-15 09:22:45 +00001565 // Objective-C pointer types.
1566 } else {
1567 const ObjCObjectPointerType *OPT = type->castAs<ObjCObjectPointerType>();
1568 value = CGF.EmitCastToVoidPtr(value);
1569
1570 CharUnits size = CGF.getContext().getTypeSizeInChars(OPT->getObjectType());
1571 if (!isInc) size = -size;
1572 llvm::Value *sizeValue =
1573 llvm::ConstantInt::get(CGF.SizeTy, size.getQuantity());
1574
Richard Smith7edf9e32012-11-01 22:30:59 +00001575 if (CGF.getLangOpts().isSignedOverflowDefined())
Chris Lattner2cb42222011-03-01 00:03:48 +00001576 value = Builder.CreateGEP(value, sizeValue, "incdec.objptr");
1577 else
1578 value = Builder.CreateInBoundsGEP(value, sizeValue, "incdec.objptr");
John McCall5936e332011-02-15 09:22:45 +00001579 value = Builder.CreateBitCast(value, input->getType());
Chris Lattner8c11a652010-06-26 22:09:34 +00001580 }
David Chisnall7a7ee302012-01-16 17:27:18 +00001581
1582 if (atomicPHI) {
1583 llvm::BasicBlock *opBB = Builder.GetInsertBlock();
1584 llvm::BasicBlock *contBB = CGF.createBasicBlock("atomic_cont", CGF.CurFn);
1585 llvm::Value *old = Builder.CreateAtomicCmpXchg(LV.getAddress(), atomicPHI,
1586 value, llvm::SequentiallyConsistent);
1587 atomicPHI->addIncoming(old, opBB);
1588 llvm::Value *success = Builder.CreateICmpEQ(old, atomicPHI);
1589 Builder.CreateCondBr(success, contBB, opBB);
1590 Builder.SetInsertPoint(contBB);
1591 return isPre ? value : input;
1592 }
Anton Korobeynikovaa4a99b2011-10-14 23:23:15 +00001593
Chris Lattner8c11a652010-06-26 22:09:34 +00001594 // Store the updated result through the lvalue.
1595 if (LV.isBitField())
John McCall545d9962011-06-25 02:11:03 +00001596 CGF.EmitStoreThroughBitfieldLValue(RValue::get(value), LV, &value);
Chris Lattner8c11a652010-06-26 22:09:34 +00001597 else
John McCall545d9962011-06-25 02:11:03 +00001598 CGF.EmitStoreThroughLValue(RValue::get(value), LV);
Anton Korobeynikovaa4a99b2011-10-14 23:23:15 +00001599
Chris Lattner8c11a652010-06-26 22:09:34 +00001600 // If this is a postinc, return the value read from memory, otherwise use the
1601 // updated value.
John McCall5936e332011-02-15 09:22:45 +00001602 return isPre ? value : input;
Chris Lattner8c11a652010-06-26 22:09:34 +00001603}
1604
1605
1606
Chris Lattner7f02f722007-08-24 05:35:26 +00001607Value *ScalarExprEmitter::VisitUnaryMinus(const UnaryOperator *E) {
Mike Stump7f79f9b2009-05-29 15:46:01 +00001608 TestAndClearIgnoreResultAssign();
Chris Lattner9a207232010-06-26 21:48:21 +00001609 // Emit unary minus with EmitSub so we handle overflow cases etc.
1610 BinOpInfo BinOp;
Chris Lattner4ac0d832010-06-28 17:12:37 +00001611 BinOp.RHS = Visit(E->getSubExpr());
1612
1613 if (BinOp.RHS->getType()->isFPOrFPVectorTy())
1614 BinOp.LHS = llvm::ConstantFP::getZeroValueForNegation(BinOp.RHS->getType());
1615 else
1616 BinOp.LHS = llvm::Constant::getNullValue(BinOp.RHS->getType());
Chris Lattner9a207232010-06-26 21:48:21 +00001617 BinOp.Ty = E->getType();
John McCall2de56d12010-08-25 11:45:40 +00001618 BinOp.Opcode = BO_Sub;
Benjamin Kramerddc57332012-10-03 20:58:04 +00001619 BinOp.FPContractable = false;
Chris Lattner9a207232010-06-26 21:48:21 +00001620 BinOp.E = E;
1621 return EmitSub(BinOp);
Chris Lattner7f02f722007-08-24 05:35:26 +00001622}
1623
1624Value *ScalarExprEmitter::VisitUnaryNot(const UnaryOperator *E) {
Mike Stump7f79f9b2009-05-29 15:46:01 +00001625 TestAndClearIgnoreResultAssign();
Chris Lattner7f02f722007-08-24 05:35:26 +00001626 Value *Op = Visit(E->getSubExpr());
1627 return Builder.CreateNot(Op, "neg");
1628}
1629
1630Value *ScalarExprEmitter::VisitUnaryLNot(const UnaryOperator *E) {
Tanya Lattner4f692c22012-01-16 21:02:28 +00001631
1632 // Perform vector logical not on comparison with zero vector.
1633 if (E->getType()->isExtVectorType()) {
1634 Value *Oper = Visit(E->getSubExpr());
1635 Value *Zero = llvm::Constant::getNullValue(Oper->getType());
1636 Value *Result = Builder.CreateICmp(llvm::CmpInst::ICMP_EQ, Oper, Zero, "cmp");
1637 return Builder.CreateSExt(Result, ConvertType(E->getType()), "sext");
1638 }
1639
Chris Lattner7f02f722007-08-24 05:35:26 +00001640 // Compare operand to zero.
1641 Value *BoolVal = CGF.EvaluateExprAsBool(E->getSubExpr());
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001642
Chris Lattner7f02f722007-08-24 05:35:26 +00001643 // Invert value.
1644 // TODO: Could dynamically modify easy computations here. For example, if
1645 // the operand is an icmp ne, turn into icmp eq.
1646 BoolVal = Builder.CreateNot(BoolVal, "lnot");
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001647
Anders Carlsson9f84d882009-05-19 18:44:53 +00001648 // ZExt result to the expr type.
1649 return Builder.CreateZExt(BoolVal, ConvertType(E->getType()), "lnot.ext");
Chris Lattner7f02f722007-08-24 05:35:26 +00001650}
1651
Eli Friedman0027d2b2010-08-05 09:58:49 +00001652Value *ScalarExprEmitter::VisitOffsetOfExpr(OffsetOfExpr *E) {
1653 // Try folding the offsetof to a constant.
Richard Smith80d4b552011-12-28 19:48:30 +00001654 llvm::APSInt Value;
1655 if (E->EvaluateAsInt(Value, CGF.getContext()))
1656 return Builder.getInt(Value);
Eli Friedman0027d2b2010-08-05 09:58:49 +00001657
1658 // Loop over the components of the offsetof to compute the value.
1659 unsigned n = E->getNumComponents();
Chris Lattner2acc6e32011-07-18 04:24:23 +00001660 llvm::Type* ResultType = ConvertType(E->getType());
Eli Friedman0027d2b2010-08-05 09:58:49 +00001661 llvm::Value* Result = llvm::Constant::getNullValue(ResultType);
1662 QualType CurrentType = E->getTypeSourceInfo()->getType();
1663 for (unsigned i = 0; i != n; ++i) {
1664 OffsetOfExpr::OffsetOfNode ON = E->getComponent(i);
Eli Friedman16fd39f2010-08-06 16:37:05 +00001665 llvm::Value *Offset = 0;
Eli Friedman0027d2b2010-08-05 09:58:49 +00001666 switch (ON.getKind()) {
1667 case OffsetOfExpr::OffsetOfNode::Array: {
1668 // Compute the index
1669 Expr *IdxExpr = E->getIndexExpr(ON.getArrayExprIndex());
1670 llvm::Value* Idx = CGF.EmitScalarExpr(IdxExpr);
Douglas Gregor575a1c92011-05-20 16:38:50 +00001671 bool IdxSigned = IdxExpr->getType()->isSignedIntegerOrEnumerationType();
Eli Friedman0027d2b2010-08-05 09:58:49 +00001672 Idx = Builder.CreateIntCast(Idx, ResultType, IdxSigned, "conv");
1673
1674 // Save the element type
1675 CurrentType =
1676 CGF.getContext().getAsArrayType(CurrentType)->getElementType();
1677
1678 // Compute the element size
1679 llvm::Value* ElemSize = llvm::ConstantInt::get(ResultType,
1680 CGF.getContext().getTypeSizeInChars(CurrentType).getQuantity());
1681
1682 // Multiply out to compute the result
1683 Offset = Builder.CreateMul(Idx, ElemSize);
1684 break;
1685 }
1686
1687 case OffsetOfExpr::OffsetOfNode::Field: {
1688 FieldDecl *MemberDecl = ON.getField();
1689 RecordDecl *RD = CurrentType->getAs<RecordType>()->getDecl();
1690 const ASTRecordLayout &RL = CGF.getContext().getASTRecordLayout(RD);
1691
1692 // Compute the index of the field in its parent.
1693 unsigned i = 0;
1694 // FIXME: It would be nice if we didn't have to loop here!
1695 for (RecordDecl::field_iterator Field = RD->field_begin(),
1696 FieldEnd = RD->field_end();
David Blaikie262bc182012-04-30 02:36:29 +00001697 Field != FieldEnd; ++Field, ++i) {
David Blaikie581deb32012-06-06 20:45:41 +00001698 if (*Field == MemberDecl)
Eli Friedman0027d2b2010-08-05 09:58:49 +00001699 break;
1700 }
1701 assert(i < RL.getFieldCount() && "offsetof field in wrong type");
1702
1703 // Compute the offset to the field
1704 int64_t OffsetInt = RL.getFieldOffset(i) /
1705 CGF.getContext().getCharWidth();
1706 Offset = llvm::ConstantInt::get(ResultType, OffsetInt);
1707
1708 // Save the element type.
1709 CurrentType = MemberDecl->getType();
1710 break;
1711 }
Eli Friedman16fd39f2010-08-06 16:37:05 +00001712
Eli Friedman0027d2b2010-08-05 09:58:49 +00001713 case OffsetOfExpr::OffsetOfNode::Identifier:
Eli Friedman6d4e44b2010-08-06 01:17:25 +00001714 llvm_unreachable("dependent __builtin_offsetof");
Eli Friedman16fd39f2010-08-06 16:37:05 +00001715
Eli Friedman0027d2b2010-08-05 09:58:49 +00001716 case OffsetOfExpr::OffsetOfNode::Base: {
1717 if (ON.getBase()->isVirtual()) {
1718 CGF.ErrorUnsupported(E, "virtual base in offsetof");
1719 continue;
1720 }
1721
1722 RecordDecl *RD = CurrentType->getAs<RecordType>()->getDecl();
1723 const ASTRecordLayout &RL = CGF.getContext().getASTRecordLayout(RD);
1724
1725 // Save the element type.
1726 CurrentType = ON.getBase()->getType();
1727
1728 // Compute the offset to the base.
1729 const RecordType *BaseRT = CurrentType->getAs<RecordType>();
1730 CXXRecordDecl *BaseRD = cast<CXXRecordDecl>(BaseRT->getDecl());
Benjamin Kramerd4f51982012-07-04 18:45:14 +00001731 CharUnits OffsetInt = RL.getBaseClassOffset(BaseRD);
1732 Offset = llvm::ConstantInt::get(ResultType, OffsetInt.getQuantity());
Eli Friedman0027d2b2010-08-05 09:58:49 +00001733 break;
1734 }
1735 }
1736 Result = Builder.CreateAdd(Result, Offset);
1737 }
1738 return Result;
Douglas Gregor8ecdb652010-04-28 22:16:22 +00001739}
1740
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00001741/// VisitUnaryExprOrTypeTraitExpr - Return the size or alignment of the type of
Sebastian Redl05189992008-11-11 17:56:53 +00001742/// argument of the sizeof expression as an integer.
1743Value *
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00001744ScalarExprEmitter::VisitUnaryExprOrTypeTraitExpr(
1745 const UnaryExprOrTypeTraitExpr *E) {
Sebastian Redl05189992008-11-11 17:56:53 +00001746 QualType TypeToSize = E->getTypeOfArgument();
Peter Collingbournef4e3cfb2011-03-11 19:24:49 +00001747 if (E->getKind() == UETT_SizeOf) {
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001748 if (const VariableArrayType *VAT =
Eli Friedmanf2da9df2009-01-24 22:19:05 +00001749 CGF.getContext().getAsVariableArrayType(TypeToSize)) {
1750 if (E->isArgumentType()) {
1751 // sizeof(type) - make sure to emit the VLA size.
John McCallbc8d40d2011-06-24 21:55:10 +00001752 CGF.EmitVariablyModifiedType(TypeToSize);
Eli Friedman8f426fa2009-04-20 03:21:44 +00001753 } else {
1754 // C99 6.5.3.4p2: If the argument is an expression of type
1755 // VLA, it is evaluated.
John McCall2a416372010-12-05 02:00:02 +00001756 CGF.EmitIgnoredExpr(E->getArgumentExpr());
Eli Friedmanf2da9df2009-01-24 22:19:05 +00001757 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001758
John McCallbc8d40d2011-06-24 21:55:10 +00001759 QualType eltType;
1760 llvm::Value *numElts;
1761 llvm::tie(numElts, eltType) = CGF.getVLASize(VAT);
1762
1763 llvm::Value *size = numElts;
1764
1765 // Scale the number of non-VLA elements by the non-VLA element size.
1766 CharUnits eltSize = CGF.getContext().getTypeSizeInChars(eltType);
1767 if (!eltSize.isOne())
1768 size = CGF.Builder.CreateNUWMul(CGF.CGM.getSize(eltSize), numElts);
1769
1770 return size;
Anders Carlssonb50525b2008-12-21 03:33:21 +00001771 }
Anders Carlsson5d463152008-12-12 07:38:43 +00001772 }
Eli Friedmanf2da9df2009-01-24 22:19:05 +00001773
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001774 // If this isn't sizeof(vla), the result must be constant; use the constant
1775 // folding logic so we don't have to duplicate it here.
Richard Smith80d4b552011-12-28 19:48:30 +00001776 return Builder.getInt(E->EvaluateKnownConstInt(CGF.getContext()));
Chris Lattner7f02f722007-08-24 05:35:26 +00001777}
1778
Chris Lattner46f93d02007-08-24 21:20:17 +00001779Value *ScalarExprEmitter::VisitUnaryReal(const UnaryOperator *E) {
1780 Expr *Op = E->getSubExpr();
John McCallb418d742010-11-16 10:08:07 +00001781 if (Op->getType()->isAnyComplexType()) {
1782 // If it's an l-value, load through the appropriate subobject l-value.
1783 // Note that we have to ask E because Op might be an l-value that
1784 // this won't work for, e.g. an Obj-C property.
John McCall7eb0a9e2010-11-24 05:12:34 +00001785 if (E->isGLValue())
John McCall545d9962011-06-25 02:11:03 +00001786 return CGF.EmitLoadOfLValue(CGF.EmitLValue(E)).getScalarVal();
John McCallb418d742010-11-16 10:08:07 +00001787
1788 // Otherwise, calculate and project.
1789 return CGF.EmitComplexExpr(Op, false, true).first;
1790 }
1791
Chris Lattner46f93d02007-08-24 21:20:17 +00001792 return Visit(Op);
1793}
John McCallb418d742010-11-16 10:08:07 +00001794
Chris Lattner46f93d02007-08-24 21:20:17 +00001795Value *ScalarExprEmitter::VisitUnaryImag(const UnaryOperator *E) {
1796 Expr *Op = E->getSubExpr();
John McCallb418d742010-11-16 10:08:07 +00001797 if (Op->getType()->isAnyComplexType()) {
1798 // If it's an l-value, load through the appropriate subobject l-value.
1799 // Note that we have to ask E because Op might be an l-value that
1800 // this won't work for, e.g. an Obj-C property.
John McCall7eb0a9e2010-11-24 05:12:34 +00001801 if (Op->isGLValue())
John McCall545d9962011-06-25 02:11:03 +00001802 return CGF.EmitLoadOfLValue(CGF.EmitLValue(E)).getScalarVal();
John McCallb418d742010-11-16 10:08:07 +00001803
1804 // Otherwise, calculate and project.
1805 return CGF.EmitComplexExpr(Op, true, false).second;
1806 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001807
Mike Stump7f79f9b2009-05-29 15:46:01 +00001808 // __imag on a scalar returns zero. Emit the subexpr to ensure side
1809 // effects are evaluated, but not the actual value.
Richard Smithdfb80de2012-02-18 20:53:32 +00001810 if (Op->isGLValue())
1811 CGF.EmitLValue(Op);
1812 else
1813 CGF.EmitScalarExpr(Op, true);
Owen Andersonc9c88b42009-07-31 20:28:54 +00001814 return llvm::Constant::getNullValue(ConvertType(E->getType()));
Chris Lattner46f93d02007-08-24 21:20:17 +00001815}
1816
Chris Lattner7f02f722007-08-24 05:35:26 +00001817//===----------------------------------------------------------------------===//
1818// Binary Operators
1819//===----------------------------------------------------------------------===//
1820
1821BinOpInfo ScalarExprEmitter::EmitBinOps(const BinaryOperator *E) {
Mike Stump7f79f9b2009-05-29 15:46:01 +00001822 TestAndClearIgnoreResultAssign();
Chris Lattner7f02f722007-08-24 05:35:26 +00001823 BinOpInfo Result;
1824 Result.LHS = Visit(E->getLHS());
1825 Result.RHS = Visit(E->getRHS());
Chris Lattner1f1ded92007-08-24 21:00:35 +00001826 Result.Ty = E->getType();
Chris Lattner9a207232010-06-26 21:48:21 +00001827 Result.Opcode = E->getOpcode();
Lang Hamesbe9af122012-10-02 04:45:10 +00001828 Result.FPContractable = E->isFPContractable();
Chris Lattner7f02f722007-08-24 05:35:26 +00001829 Result.E = E;
1830 return Result;
1831}
1832
Douglas Gregor6a03e342010-04-23 04:16:32 +00001833LValue ScalarExprEmitter::EmitCompoundAssignLValue(
1834 const CompoundAssignOperator *E,
1835 Value *(ScalarExprEmitter::*Func)(const BinOpInfo &),
Daniel Dunbard7f7d082010-06-29 22:00:45 +00001836 Value *&Result) {
Benjamin Kramer54d76db2009-12-25 15:43:36 +00001837 QualType LHSTy = E->getLHS()->getType();
Chris Lattner1f1ded92007-08-24 21:00:35 +00001838 BinOpInfo OpInfo;
Douglas Gregor6a03e342010-04-23 04:16:32 +00001839
Eli Friedmanab3a8522009-03-28 01:22:36 +00001840 if (E->getComputationResultType()->isAnyComplexType()) {
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001841 // This needs to go through the complex expression emitter, but it's a tad
1842 // complicated to do that... I'm leaving it out for now. (Note that we do
1843 // actually need the imaginary part of the RHS for multiplication and
1844 // division.)
Eli Friedmanab3a8522009-03-28 01:22:36 +00001845 CGF.ErrorUnsupported(E, "complex compound assignment");
Daniel Dunbard7f7d082010-06-29 22:00:45 +00001846 Result = llvm::UndefValue::get(CGF.ConvertType(E->getType()));
Douglas Gregor6a03e342010-04-23 04:16:32 +00001847 return LValue();
Eli Friedmanab3a8522009-03-28 01:22:36 +00001848 }
Douglas Gregor6a03e342010-04-23 04:16:32 +00001849
Mike Stumpcc0442f2009-05-22 19:07:20 +00001850 // Emit the RHS first. __block variables need to have the rhs evaluated
1851 // first, plus this should improve codegen a little.
1852 OpInfo.RHS = Visit(E->getRHS());
1853 OpInfo.Ty = E->getComputationResultType();
Chris Lattner9a207232010-06-26 21:48:21 +00001854 OpInfo.Opcode = E->getOpcode();
Benjamin Kramerddc57332012-10-03 20:58:04 +00001855 OpInfo.FPContractable = false;
Mike Stumpcc0442f2009-05-22 19:07:20 +00001856 OpInfo.E = E;
Eli Friedmanab3a8522009-03-28 01:22:36 +00001857 // Load/convert the LHS.
Richard Smith7ac9ef12012-09-08 02:08:36 +00001858 LValue LHSLV = EmitCheckedLValue(E->getLHS(), CodeGenFunction::TCK_Store);
John McCall545d9962011-06-25 02:11:03 +00001859 OpInfo.LHS = EmitLoadOfLValue(LHSLV);
David Chisnall7a7ee302012-01-16 17:27:18 +00001860
1861 llvm::PHINode *atomicPHI = 0;
Eli Friedman860a3192012-06-16 02:19:17 +00001862 if (LHSTy->isAtomicType()) {
David Chisnall7a7ee302012-01-16 17:27:18 +00001863 // FIXME: For floating point types, we should be saving and restoring the
1864 // floating point environment in the loop.
1865 llvm::BasicBlock *startBB = Builder.GetInsertBlock();
1866 llvm::BasicBlock *opBB = CGF.createBasicBlock("atomic_op", CGF.CurFn);
1867 Builder.CreateBr(opBB);
1868 Builder.SetInsertPoint(opBB);
1869 atomicPHI = Builder.CreatePHI(OpInfo.LHS->getType(), 2);
1870 atomicPHI->addIncoming(OpInfo.LHS, startBB);
David Chisnall7a7ee302012-01-16 17:27:18 +00001871 OpInfo.LHS = atomicPHI;
1872 }
Eli Friedman860a3192012-06-16 02:19:17 +00001873
1874 OpInfo.LHS = EmitScalarConversion(OpInfo.LHS, LHSTy,
1875 E->getComputationLHSType());
1876
Chris Lattner1f1ded92007-08-24 21:00:35 +00001877 // Expand the binary operator.
Daniel Dunbard7f7d082010-06-29 22:00:45 +00001878 Result = (this->*Func)(OpInfo);
Douglas Gregor6a03e342010-04-23 04:16:32 +00001879
Daniel Dunbar8c6f57c2008-08-06 02:00:38 +00001880 // Convert the result back to the LHS type.
Eli Friedmanab3a8522009-03-28 01:22:36 +00001881 Result = EmitScalarConversion(Result, E->getComputationResultType(), LHSTy);
David Chisnall7a7ee302012-01-16 17:27:18 +00001882
1883 if (atomicPHI) {
1884 llvm::BasicBlock *opBB = Builder.GetInsertBlock();
1885 llvm::BasicBlock *contBB = CGF.createBasicBlock("atomic_cont", CGF.CurFn);
1886 llvm::Value *old = Builder.CreateAtomicCmpXchg(LHSLV.getAddress(), atomicPHI,
1887 Result, llvm::SequentiallyConsistent);
1888 atomicPHI->addIncoming(old, opBB);
1889 llvm::Value *success = Builder.CreateICmpEQ(old, atomicPHI);
1890 Builder.CreateCondBr(success, contBB, opBB);
1891 Builder.SetInsertPoint(contBB);
1892 return LHSLV;
1893 }
Douglas Gregor6a03e342010-04-23 04:16:32 +00001894
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001895 // Store the result value into the LHS lvalue. Bit-fields are handled
1896 // specially because the result is altered by the store, i.e., [C99 6.5.16p1]
1897 // 'An assignment expression has the value of the left operand after the
1898 // assignment...'.
Daniel Dunbard7f7d082010-06-29 22:00:45 +00001899 if (LHSLV.isBitField())
John McCall545d9962011-06-25 02:11:03 +00001900 CGF.EmitStoreThroughBitfieldLValue(RValue::get(Result), LHSLV, &Result);
Daniel Dunbard7f7d082010-06-29 22:00:45 +00001901 else
John McCall545d9962011-06-25 02:11:03 +00001902 CGF.EmitStoreThroughLValue(RValue::get(Result), LHSLV);
Daniel Dunbard7f7d082010-06-29 22:00:45 +00001903
Douglas Gregor6a03e342010-04-23 04:16:32 +00001904 return LHSLV;
1905}
1906
1907Value *ScalarExprEmitter::EmitCompoundAssign(const CompoundAssignOperator *E,
1908 Value *(ScalarExprEmitter::*Func)(const BinOpInfo &)) {
1909 bool Ignore = TestAndClearIgnoreResultAssign();
Daniel Dunbard7f7d082010-06-29 22:00:45 +00001910 Value *RHS;
1911 LValue LHS = EmitCompoundAssignLValue(E, Func, RHS);
1912
1913 // If the result is clearly ignored, return now.
Mike Stump7f79f9b2009-05-29 15:46:01 +00001914 if (Ignore)
1915 return 0;
Daniel Dunbard7f7d082010-06-29 22:00:45 +00001916
John McCallb418d742010-11-16 10:08:07 +00001917 // The result of an assignment in C is the assigned r-value.
Richard Smith7edf9e32012-11-01 22:30:59 +00001918 if (!CGF.getLangOpts().CPlusPlus)
John McCallb418d742010-11-16 10:08:07 +00001919 return RHS;
1920
Daniel Dunbard7f7d082010-06-29 22:00:45 +00001921 // If the lvalue is non-volatile, return the computed value of the assignment.
1922 if (!LHS.isVolatileQualified())
1923 return RHS;
1924
1925 // Otherwise, reload the value.
John McCall545d9962011-06-25 02:11:03 +00001926 return EmitLoadOfLValue(LHS);
Chris Lattner1f1ded92007-08-24 21:00:35 +00001927}
1928
Chris Lattner80230302010-09-11 21:47:09 +00001929void ScalarExprEmitter::EmitUndefinedBehaviorIntegerDivAndRemCheck(
Richard Smith7ac9ef12012-09-08 02:08:36 +00001930 const BinOpInfo &Ops, llvm::Value *Zero, bool isDiv) {
Richard Smithc54e25f2012-11-06 02:30:30 +00001931 llvm::Value *Cond = 0;
Chris Lattner80230302010-09-11 21:47:09 +00001932
Will Dietz4f45bc02013-01-18 11:30:38 +00001933 if (CGF.SanOpts->IntegerDivideByZero)
Richard Smithc54e25f2012-11-06 02:30:30 +00001934 Cond = Builder.CreateICmpNE(Ops.RHS, Zero);
1935
Will Dietz4f45bc02013-01-18 11:30:38 +00001936 if (CGF.SanOpts->SignedIntegerOverflow &&
Richard Smithc54e25f2012-11-06 02:30:30 +00001937 Ops.Ty->hasSignedIntegerRepresentation()) {
1938 llvm::IntegerType *Ty = cast<llvm::IntegerType>(Zero->getType());
1939
Chris Lattner80230302010-09-11 21:47:09 +00001940 llvm::Value *IntMin =
Chris Lattner48431f92011-04-19 22:55:03 +00001941 Builder.getInt(llvm::APInt::getSignedMinValue(Ty->getBitWidth()));
Chris Lattner80230302010-09-11 21:47:09 +00001942 llvm::Value *NegOne = llvm::ConstantInt::get(Ty, -1ULL);
1943
Richard Smith7ac9ef12012-09-08 02:08:36 +00001944 llvm::Value *LHSCmp = Builder.CreateICmpNE(Ops.LHS, IntMin);
1945 llvm::Value *RHSCmp = Builder.CreateICmpNE(Ops.RHS, NegOne);
Richard Smithc54e25f2012-11-06 02:30:30 +00001946 llvm::Value *Overflow = Builder.CreateOr(LHSCmp, RHSCmp, "or");
1947 Cond = Cond ? Builder.CreateAnd(Cond, Overflow, "and") : Overflow;
Chris Lattner80230302010-09-11 21:47:09 +00001948 }
Richard Smithc54e25f2012-11-06 02:30:30 +00001949
1950 if (Cond)
1951 EmitBinOpCheck(Cond, Ops);
Chris Lattner80230302010-09-11 21:47:09 +00001952}
Chris Lattner1f1ded92007-08-24 21:00:35 +00001953
Chris Lattner7f02f722007-08-24 05:35:26 +00001954Value *ScalarExprEmitter::EmitDiv(const BinOpInfo &Ops) {
Will Dietz4f45bc02013-01-18 11:30:38 +00001955 if ((CGF.SanOpts->IntegerDivideByZero ||
1956 CGF.SanOpts->SignedIntegerOverflow) &&
Will Dietzb8540362012-11-27 15:01:55 +00001957 Ops.Ty->isIntegerType()) {
Chris Lattner80230302010-09-11 21:47:09 +00001958 llvm::Value *Zero = llvm::Constant::getNullValue(ConvertType(Ops.Ty));
Will Dietzb8540362012-11-27 15:01:55 +00001959 EmitUndefinedBehaviorIntegerDivAndRemCheck(Ops, Zero, true);
Will Dietz4f45bc02013-01-18 11:30:38 +00001960 } else if (CGF.SanOpts->FloatDivideByZero &&
Will Dietzb8540362012-11-27 15:01:55 +00001961 Ops.Ty->isRealFloatingType()) {
1962 llvm::Value *Zero = llvm::Constant::getNullValue(ConvertType(Ops.Ty));
1963 EmitBinOpCheck(Builder.CreateFCmpUNE(Ops.RHS, Zero), Ops);
Chris Lattner80230302010-09-11 21:47:09 +00001964 }
Will Dietzb8540362012-11-27 15:01:55 +00001965
Peter Collingbournec5096cb2011-10-27 19:19:51 +00001966 if (Ops.LHS->getType()->isFPOrFPVectorTy()) {
1967 llvm::Value *Val = Builder.CreateFDiv(Ops.LHS, Ops.RHS, "div");
Richard Smith7edf9e32012-11-01 22:30:59 +00001968 if (CGF.getLangOpts().OpenCL) {
Peter Collingbournec5096cb2011-10-27 19:19:51 +00001969 // OpenCL 1.1 7.4: minimum accuracy of single precision / is 2.5ulp
1970 llvm::Type *ValTy = Val->getType();
1971 if (ValTy->isFloatTy() ||
1972 (isa<llvm::VectorType>(ValTy) &&
1973 cast<llvm::VectorType>(ValTy)->getElementType()->isFloatTy()))
Duncan Sands82500162012-04-10 08:23:07 +00001974 CGF.SetFPAccuracy(Val, 2.5);
Peter Collingbournec5096cb2011-10-27 19:19:51 +00001975 }
1976 return Val;
1977 }
Douglas Gregorf6094622010-07-23 15:58:24 +00001978 else if (Ops.Ty->hasUnsignedIntegerRepresentation())
Chris Lattner7f02f722007-08-24 05:35:26 +00001979 return Builder.CreateUDiv(Ops.LHS, Ops.RHS, "div");
1980 else
1981 return Builder.CreateSDiv(Ops.LHS, Ops.RHS, "div");
1982}
1983
1984Value *ScalarExprEmitter::EmitRem(const BinOpInfo &Ops) {
1985 // Rem in C can't be a floating point type: C99 6.5.5p2.
Will Dietz4f45bc02013-01-18 11:30:38 +00001986 if (CGF.SanOpts->IntegerDivideByZero) {
Chris Lattner80230302010-09-11 21:47:09 +00001987 llvm::Value *Zero = llvm::Constant::getNullValue(ConvertType(Ops.Ty));
1988
Will Dietzb8540362012-11-27 15:01:55 +00001989 if (Ops.Ty->isIntegerType())
Chris Lattner80230302010-09-11 21:47:09 +00001990 EmitUndefinedBehaviorIntegerDivAndRemCheck(Ops, Zero, false);
1991 }
1992
Eli Friedman52d68742011-04-10 04:44:11 +00001993 if (Ops.Ty->hasUnsignedIntegerRepresentation())
Chris Lattner7f02f722007-08-24 05:35:26 +00001994 return Builder.CreateURem(Ops.LHS, Ops.RHS, "rem");
1995 else
1996 return Builder.CreateSRem(Ops.LHS, Ops.RHS, "rem");
1997}
1998
Mike Stump2add4732009-04-01 20:28:16 +00001999Value *ScalarExprEmitter::EmitOverflowCheckedBinOp(const BinOpInfo &Ops) {
2000 unsigned IID;
2001 unsigned OpID = 0;
Mike Stump5d8b2cf2009-04-02 01:03:55 +00002002
Will Dietzb8540362012-11-27 15:01:55 +00002003 bool isSigned = Ops.Ty->isSignedIntegerOrEnumerationType();
Chris Lattner9a207232010-06-26 21:48:21 +00002004 switch (Ops.Opcode) {
John McCall2de56d12010-08-25 11:45:40 +00002005 case BO_Add:
2006 case BO_AddAssign:
Mike Stump035cf892009-04-02 18:15:54 +00002007 OpID = 1;
Will Dietzb8540362012-11-27 15:01:55 +00002008 IID = isSigned ? llvm::Intrinsic::sadd_with_overflow :
2009 llvm::Intrinsic::uadd_with_overflow;
Mike Stump035cf892009-04-02 18:15:54 +00002010 break;
John McCall2de56d12010-08-25 11:45:40 +00002011 case BO_Sub:
2012 case BO_SubAssign:
Mike Stump035cf892009-04-02 18:15:54 +00002013 OpID = 2;
Will Dietzb8540362012-11-27 15:01:55 +00002014 IID = isSigned ? llvm::Intrinsic::ssub_with_overflow :
2015 llvm::Intrinsic::usub_with_overflow;
Mike Stump035cf892009-04-02 18:15:54 +00002016 break;
John McCall2de56d12010-08-25 11:45:40 +00002017 case BO_Mul:
2018 case BO_MulAssign:
Mike Stump035cf892009-04-02 18:15:54 +00002019 OpID = 3;
Will Dietzb8540362012-11-27 15:01:55 +00002020 IID = isSigned ? llvm::Intrinsic::smul_with_overflow :
2021 llvm::Intrinsic::umul_with_overflow;
Mike Stump035cf892009-04-02 18:15:54 +00002022 break;
2023 default:
David Blaikieb219cfc2011-09-23 05:06:16 +00002024 llvm_unreachable("Unsupported operation for overflow detection");
Mike Stump2add4732009-04-01 20:28:16 +00002025 }
Mike Stump035cf892009-04-02 18:15:54 +00002026 OpID <<= 1;
Will Dietzb8540362012-11-27 15:01:55 +00002027 if (isSigned)
2028 OpID |= 1;
Mike Stump035cf892009-04-02 18:15:54 +00002029
Chris Lattner9cbe4f02011-07-09 17:41:47 +00002030 llvm::Type *opTy = CGF.CGM.getTypes().ConvertType(Ops.Ty);
Mike Stump2add4732009-04-01 20:28:16 +00002031
Benjamin Kramer8dd55a32011-07-14 17:45:50 +00002032 llvm::Function *intrinsic = CGF.CGM.getIntrinsic(IID, opTy);
Mike Stump2add4732009-04-01 20:28:16 +00002033
2034 Value *resultAndOverflow = Builder.CreateCall2(intrinsic, Ops.LHS, Ops.RHS);
2035 Value *result = Builder.CreateExtractValue(resultAndOverflow, 0);
2036 Value *overflow = Builder.CreateExtractValue(resultAndOverflow, 1);
2037
Richard Smith7ac9ef12012-09-08 02:08:36 +00002038 // Handle overflow with llvm.trap if no custom handler has been specified.
2039 const std::string *handlerName =
Richard Smith7edf9e32012-11-01 22:30:59 +00002040 &CGF.getLangOpts().OverflowHandler;
Richard Smith7ac9ef12012-09-08 02:08:36 +00002041 if (handlerName->empty()) {
Richard Smithd6396a62012-11-05 22:21:05 +00002042 // If the signed-integer-overflow sanitizer is enabled, emit a call to its
Richard Smithcc305612012-11-01 22:15:34 +00002043 // runtime. Otherwise, this is a -ftrapv check, so just emit a trap.
Will Dietz4f45bc02013-01-18 11:30:38 +00002044 if (!isSigned || CGF.SanOpts->SignedIntegerOverflow)
Richard Smithcc305612012-11-01 22:15:34 +00002045 EmitBinOpCheck(Builder.CreateNot(overflow), Ops);
2046 else
2047 CGF.EmitTrapvCheck(Builder.CreateNot(overflow));
Richard Smith7ac9ef12012-09-08 02:08:36 +00002048 return result;
2049 }
2050
Mike Stump2add4732009-04-01 20:28:16 +00002051 // Branch in case of overflow.
David Chisnall7f18e672010-09-17 18:29:54 +00002052 llvm::BasicBlock *initialBB = Builder.GetInsertBlock();
Bill Wendling14ef3192011-07-07 21:13:10 +00002053 llvm::Function::iterator insertPt = initialBB;
2054 llvm::BasicBlock *continueBB = CGF.createBasicBlock("nooverflow", CGF.CurFn,
2055 llvm::next(insertPt));
Chris Lattner93a00352010-08-07 00:20:46 +00002056 llvm::BasicBlock *overflowBB = CGF.createBasicBlock("overflow", CGF.CurFn);
Mike Stump2add4732009-04-01 20:28:16 +00002057
2058 Builder.CreateCondBr(overflow, overflowBB, continueBB);
2059
David Chisnall7f18e672010-09-17 18:29:54 +00002060 // If an overflow handler is set, then we want to call it and then use its
2061 // result, if it returns.
2062 Builder.SetInsertPoint(overflowBB);
2063
2064 // Get the overflow handler.
Chris Lattner8b418682012-02-07 00:39:47 +00002065 llvm::Type *Int8Ty = CGF.Int8Ty;
Chris Lattner9cbe4f02011-07-09 17:41:47 +00002066 llvm::Type *argTypes[] = { CGF.Int64Ty, CGF.Int64Ty, Int8Ty, Int8Ty };
David Chisnall7f18e672010-09-17 18:29:54 +00002067 llvm::FunctionType *handlerTy =
2068 llvm::FunctionType::get(CGF.Int64Ty, argTypes, true);
2069 llvm::Value *handler = CGF.CGM.CreateRuntimeFunction(handlerTy, *handlerName);
2070
2071 // Sign extend the args to 64-bit, so that we can use the same handler for
2072 // all types of overflow.
2073 llvm::Value *lhs = Builder.CreateSExt(Ops.LHS, CGF.Int64Ty);
2074 llvm::Value *rhs = Builder.CreateSExt(Ops.RHS, CGF.Int64Ty);
2075
2076 // Call the handler with the two arguments, the operation, and the size of
2077 // the result.
2078 llvm::Value *handlerResult = Builder.CreateCall4(handler, lhs, rhs,
2079 Builder.getInt8(OpID),
2080 Builder.getInt8(cast<llvm::IntegerType>(opTy)->getBitWidth()));
2081
2082 // Truncate the result back to the desired size.
2083 handlerResult = Builder.CreateTrunc(handlerResult, opTy);
2084 Builder.CreateBr(continueBB);
2085
Mike Stump2add4732009-04-01 20:28:16 +00002086 Builder.SetInsertPoint(continueBB);
Jay Foadbbf3bac2011-03-30 11:28:58 +00002087 llvm::PHINode *phi = Builder.CreatePHI(opTy, 2);
David Chisnall7f18e672010-09-17 18:29:54 +00002088 phi->addIncoming(result, initialBB);
2089 phi->addIncoming(handlerResult, overflowBB);
2090
2091 return phi;
Mike Stump2add4732009-04-01 20:28:16 +00002092}
Chris Lattner7f02f722007-08-24 05:35:26 +00002093
John McCall913dab22011-06-25 01:32:37 +00002094/// Emit pointer + index arithmetic.
2095static Value *emitPointerArithmetic(CodeGenFunction &CGF,
2096 const BinOpInfo &op,
2097 bool isSubtraction) {
2098 // Must have binary (not unary) expr here. Unary pointer
2099 // increment/decrement doesn't use this path.
2100 const BinaryOperator *expr = cast<BinaryOperator>(op.E);
2101
2102 Value *pointer = op.LHS;
2103 Expr *pointerOperand = expr->getLHS();
2104 Value *index = op.RHS;
2105 Expr *indexOperand = expr->getRHS();
2106
2107 // In a subtraction, the LHS is always the pointer.
2108 if (!isSubtraction && !pointer->getType()->isPointerTy()) {
2109 std::swap(pointer, index);
2110 std::swap(pointerOperand, indexOperand);
2111 }
2112
2113 unsigned width = cast<llvm::IntegerType>(index->getType())->getBitWidth();
2114 if (width != CGF.PointerWidthInBits) {
2115 // Zero-extend or sign-extend the pointer value according to
2116 // whether the index is signed or not.
2117 bool isSigned = indexOperand->getType()->isSignedIntegerOrEnumerationType();
2118 index = CGF.Builder.CreateIntCast(index, CGF.PtrDiffTy, isSigned,
2119 "idx.ext");
2120 }
2121
2122 // If this is subtraction, negate the index.
2123 if (isSubtraction)
2124 index = CGF.Builder.CreateNeg(index, "idx.neg");
2125
2126 const PointerType *pointerType
2127 = pointerOperand->getType()->getAs<PointerType>();
2128 if (!pointerType) {
2129 QualType objectType = pointerOperand->getType()
2130 ->castAs<ObjCObjectPointerType>()
2131 ->getPointeeType();
2132 llvm::Value *objectSize
2133 = CGF.CGM.getSize(CGF.getContext().getTypeSizeInChars(objectType));
2134
2135 index = CGF.Builder.CreateMul(index, objectSize);
2136
2137 Value *result = CGF.Builder.CreateBitCast(pointer, CGF.VoidPtrTy);
2138 result = CGF.Builder.CreateGEP(result, index, "add.ptr");
2139 return CGF.Builder.CreateBitCast(result, pointer->getType());
2140 }
2141
2142 QualType elementType = pointerType->getPointeeType();
2143 if (const VariableArrayType *vla
2144 = CGF.getContext().getAsVariableArrayType(elementType)) {
2145 // The element count here is the total number of non-VLA elements.
2146 llvm::Value *numElements = CGF.getVLASize(vla).first;
2147
2148 // Effectively, the multiply by the VLA size is part of the GEP.
2149 // GEP indexes are signed, and scaling an index isn't permitted to
2150 // signed-overflow, so we use the same semantics for our explicit
2151 // multiply. We suppress this if overflow is not undefined behavior.
David Blaikie4e4d0842012-03-11 07:00:24 +00002152 if (CGF.getLangOpts().isSignedOverflowDefined()) {
John McCall913dab22011-06-25 01:32:37 +00002153 index = CGF.Builder.CreateMul(index, numElements, "vla.index");
2154 pointer = CGF.Builder.CreateGEP(pointer, index, "add.ptr");
2155 } else {
2156 index = CGF.Builder.CreateNSWMul(index, numElements, "vla.index");
2157 pointer = CGF.Builder.CreateInBoundsGEP(pointer, index, "add.ptr");
Chris Lattnera4d71452010-06-26 21:25:03 +00002158 }
John McCall913dab22011-06-25 01:32:37 +00002159 return pointer;
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002160 }
Daniel Dunbar2a866252009-04-25 05:08:32 +00002161
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002162 // Explicitly handle GNU void* and function pointer arithmetic extensions. The
2163 // GNU void* casts amount to no-ops since our void* type is i8*, but this is
2164 // future proof.
John McCall913dab22011-06-25 01:32:37 +00002165 if (elementType->isVoidType() || elementType->isFunctionType()) {
2166 Value *result = CGF.Builder.CreateBitCast(pointer, CGF.VoidPtrTy);
2167 result = CGF.Builder.CreateGEP(result, index, "add.ptr");
2168 return CGF.Builder.CreateBitCast(result, pointer->getType());
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002169 }
2170
David Blaikie4e4d0842012-03-11 07:00:24 +00002171 if (CGF.getLangOpts().isSignedOverflowDefined())
John McCall913dab22011-06-25 01:32:37 +00002172 return CGF.Builder.CreateGEP(pointer, index, "add.ptr");
2173
2174 return CGF.Builder.CreateInBoundsGEP(pointer, index, "add.ptr");
Chris Lattner7f02f722007-08-24 05:35:26 +00002175}
2176
Lang Hamesbe9af122012-10-02 04:45:10 +00002177// Construct an fmuladd intrinsic to represent a fused mul-add of MulOp and
2178// Addend. Use negMul and negAdd to negate the first operand of the Mul or
2179// the add operand respectively. This allows fmuladd to represent a*b-c, or
2180// c-a*b. Patterns in LLVM should catch the negated forms and translate them to
2181// efficient operations.
2182static Value* buildFMulAdd(llvm::BinaryOperator *MulOp, Value *Addend,
2183 const CodeGenFunction &CGF, CGBuilderTy &Builder,
2184 bool negMul, bool negAdd) {
2185 assert(!(negMul && negAdd) && "Only one of negMul and negAdd should be set.");
2186
2187 Value *MulOp0 = MulOp->getOperand(0);
2188 Value *MulOp1 = MulOp->getOperand(1);
2189 if (negMul) {
2190 MulOp0 =
2191 Builder.CreateFSub(
2192 llvm::ConstantFP::getZeroValueForNegation(MulOp0->getType()), MulOp0,
2193 "neg");
2194 } else if (negAdd) {
2195 Addend =
2196 Builder.CreateFSub(
2197 llvm::ConstantFP::getZeroValueForNegation(Addend->getType()), Addend,
2198 "neg");
2199 }
2200
2201 Value *FMulAdd =
2202 Builder.CreateCall3(
2203 CGF.CGM.getIntrinsic(llvm::Intrinsic::fmuladd, Addend->getType()),
2204 MulOp0, MulOp1, Addend);
2205 MulOp->eraseFromParent();
2206
2207 return FMulAdd;
2208}
2209
2210// Check whether it would be legal to emit an fmuladd intrinsic call to
2211// represent op and if so, build the fmuladd.
2212//
2213// Checks that (a) the operation is fusable, and (b) -ffp-contract=on.
2214// Does NOT check the type of the operation - it's assumed that this function
2215// will be called from contexts where it's known that the type is contractable.
2216static Value* tryEmitFMulAdd(const BinOpInfo &op,
2217 const CodeGenFunction &CGF, CGBuilderTy &Builder,
2218 bool isSub=false) {
2219
2220 assert((op.Opcode == BO_Add || op.Opcode == BO_AddAssign ||
2221 op.Opcode == BO_Sub || op.Opcode == BO_SubAssign) &&
2222 "Only fadd/fsub can be the root of an fmuladd.");
2223
2224 // Check whether this op is marked as fusable.
2225 if (!op.FPContractable)
2226 return 0;
2227
2228 // Check whether -ffp-contract=on. (If -ffp-contract=off/fast, fusing is
2229 // either disabled, or handled entirely by the LLVM backend).
Lang Hames931c0832012-11-15 07:51:26 +00002230 if (CGF.CGM.getCodeGenOpts().getFPContractMode() != CodeGenOptions::FPC_On)
Lang Hamesbe9af122012-10-02 04:45:10 +00002231 return 0;
2232
2233 // We have a potentially fusable op. Look for a mul on one of the operands.
2234 if (llvm::BinaryOperator* LHSBinOp = dyn_cast<llvm::BinaryOperator>(op.LHS)) {
2235 if (LHSBinOp->getOpcode() == llvm::Instruction::FMul) {
Lang Hamesff4ae6d2012-10-04 03:23:25 +00002236 assert(LHSBinOp->getNumUses() == 0 &&
2237 "Operations with multiple uses shouldn't be contracted.");
Lang Hamesbe9af122012-10-02 04:45:10 +00002238 return buildFMulAdd(LHSBinOp, op.RHS, CGF, Builder, false, isSub);
2239 }
2240 } else if (llvm::BinaryOperator* RHSBinOp =
2241 dyn_cast<llvm::BinaryOperator>(op.RHS)) {
2242 if (RHSBinOp->getOpcode() == llvm::Instruction::FMul) {
Lang Hamesff4ae6d2012-10-04 03:23:25 +00002243 assert(RHSBinOp->getNumUses() == 0 &&
2244 "Operations with multiple uses shouldn't be contracted.");
Lang Hamesbe9af122012-10-02 04:45:10 +00002245 return buildFMulAdd(RHSBinOp, op.LHS, CGF, Builder, isSub, false);
2246 }
2247 }
2248
2249 return 0;
2250}
2251
John McCall913dab22011-06-25 01:32:37 +00002252Value *ScalarExprEmitter::EmitAdd(const BinOpInfo &op) {
2253 if (op.LHS->getType()->isPointerTy() ||
2254 op.RHS->getType()->isPointerTy())
2255 return emitPointerArithmetic(CGF, op, /*subtraction*/ false);
2256
2257 if (op.Ty->isSignedIntegerOrEnumerationType()) {
Richard Smith7edf9e32012-11-01 22:30:59 +00002258 switch (CGF.getLangOpts().getSignedOverflowBehavior()) {
John McCall913dab22011-06-25 01:32:37 +00002259 case LangOptions::SOB_Defined:
2260 return Builder.CreateAdd(op.LHS, op.RHS, "add");
Richard Smith9d3e2262012-08-25 00:32:28 +00002261 case LangOptions::SOB_Undefined:
Will Dietz4f45bc02013-01-18 11:30:38 +00002262 if (!CGF.SanOpts->SignedIntegerOverflow)
Richard Smith9d3e2262012-08-25 00:32:28 +00002263 return Builder.CreateNSWAdd(op.LHS, op.RHS, "add");
2264 // Fall through.
John McCall913dab22011-06-25 01:32:37 +00002265 case LangOptions::SOB_Trapping:
2266 return EmitOverflowCheckedBinOp(op);
2267 }
2268 }
Will Dietzb8540362012-11-27 15:01:55 +00002269
Will Dietz4f45bc02013-01-18 11:30:38 +00002270 if (op.Ty->isUnsignedIntegerType() && CGF.SanOpts->UnsignedIntegerOverflow)
Will Dietzb8540362012-11-27 15:01:55 +00002271 return EmitOverflowCheckedBinOp(op);
2272
Lang Hamesbe9af122012-10-02 04:45:10 +00002273 if (op.LHS->getType()->isFPOrFPVectorTy()) {
2274 // Try to form an fmuladd.
2275 if (Value *FMulAdd = tryEmitFMulAdd(op, CGF, Builder))
2276 return FMulAdd;
2277
John McCall913dab22011-06-25 01:32:37 +00002278 return Builder.CreateFAdd(op.LHS, op.RHS, "add");
Lang Hamesbe9af122012-10-02 04:45:10 +00002279 }
John McCall913dab22011-06-25 01:32:37 +00002280
2281 return Builder.CreateAdd(op.LHS, op.RHS, "add");
2282}
2283
2284Value *ScalarExprEmitter::EmitSub(const BinOpInfo &op) {
2285 // The LHS is always a pointer if either side is.
2286 if (!op.LHS->getType()->isPointerTy()) {
2287 if (op.Ty->isSignedIntegerOrEnumerationType()) {
Richard Smith7edf9e32012-11-01 22:30:59 +00002288 switch (CGF.getLangOpts().getSignedOverflowBehavior()) {
Chris Lattnera4d71452010-06-26 21:25:03 +00002289 case LangOptions::SOB_Defined:
John McCall913dab22011-06-25 01:32:37 +00002290 return Builder.CreateSub(op.LHS, op.RHS, "sub");
Richard Smith9d3e2262012-08-25 00:32:28 +00002291 case LangOptions::SOB_Undefined:
Will Dietz4f45bc02013-01-18 11:30:38 +00002292 if (!CGF.SanOpts->SignedIntegerOverflow)
Richard Smith9d3e2262012-08-25 00:32:28 +00002293 return Builder.CreateNSWSub(op.LHS, op.RHS, "sub");
2294 // Fall through.
Chris Lattnera4d71452010-06-26 21:25:03 +00002295 case LangOptions::SOB_Trapping:
John McCall913dab22011-06-25 01:32:37 +00002296 return EmitOverflowCheckedBinOp(op);
Chris Lattnera4d71452010-06-26 21:25:03 +00002297 }
2298 }
Will Dietzb8540362012-11-27 15:01:55 +00002299
Will Dietz4f45bc02013-01-18 11:30:38 +00002300 if (op.Ty->isUnsignedIntegerType() && CGF.SanOpts->UnsignedIntegerOverflow)
Will Dietzb8540362012-11-27 15:01:55 +00002301 return EmitOverflowCheckedBinOp(op);
2302
Lang Hamesbe9af122012-10-02 04:45:10 +00002303 if (op.LHS->getType()->isFPOrFPVectorTy()) {
2304 // Try to form an fmuladd.
2305 if (Value *FMulAdd = tryEmitFMulAdd(op, CGF, Builder, true))
2306 return FMulAdd;
John McCall913dab22011-06-25 01:32:37 +00002307 return Builder.CreateFSub(op.LHS, op.RHS, "sub");
Lang Hamesbe9af122012-10-02 04:45:10 +00002308 }
Chris Lattner2eb91e42010-03-29 17:28:16 +00002309
John McCall913dab22011-06-25 01:32:37 +00002310 return Builder.CreateSub(op.LHS, op.RHS, "sub");
Mike Stump2add4732009-04-01 20:28:16 +00002311 }
Chris Lattner1f1ded92007-08-24 21:00:35 +00002312
John McCall913dab22011-06-25 01:32:37 +00002313 // If the RHS is not a pointer, then we have normal pointer
2314 // arithmetic.
2315 if (!op.RHS->getType()->isPointerTy())
2316 return emitPointerArithmetic(CGF, op, /*subtraction*/ true);
Eli Friedmandaa24a22009-03-28 02:45:41 +00002317
John McCall913dab22011-06-25 01:32:37 +00002318 // Otherwise, this is a pointer subtraction.
Daniel Dunbarb09fae72009-01-23 18:51:09 +00002319
John McCall913dab22011-06-25 01:32:37 +00002320 // Do the raw subtraction part.
2321 llvm::Value *LHS
2322 = Builder.CreatePtrToInt(op.LHS, CGF.PtrDiffTy, "sub.ptr.lhs.cast");
2323 llvm::Value *RHS
2324 = Builder.CreatePtrToInt(op.RHS, CGF.PtrDiffTy, "sub.ptr.rhs.cast");
2325 Value *diffInChars = Builder.CreateSub(LHS, RHS, "sub.ptr.sub");
Daniel Dunbar2a866252009-04-25 05:08:32 +00002326
John McCall913dab22011-06-25 01:32:37 +00002327 // Okay, figure out the element size.
2328 const BinaryOperator *expr = cast<BinaryOperator>(op.E);
2329 QualType elementType = expr->getLHS()->getType()->getPointeeType();
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002330
John McCall913dab22011-06-25 01:32:37 +00002331 llvm::Value *divisor = 0;
2332
2333 // For a variable-length array, this is going to be non-constant.
2334 if (const VariableArrayType *vla
2335 = CGF.getContext().getAsVariableArrayType(elementType)) {
2336 llvm::Value *numElements;
2337 llvm::tie(numElements, elementType) = CGF.getVLASize(vla);
2338
2339 divisor = numElements;
2340
2341 // Scale the number of non-VLA elements by the non-VLA element size.
2342 CharUnits eltSize = CGF.getContext().getTypeSizeInChars(elementType);
2343 if (!eltSize.isOne())
2344 divisor = CGF.Builder.CreateNUWMul(CGF.CGM.getSize(eltSize), divisor);
2345
2346 // For everything elese, we can just compute it, safe in the
2347 // assumption that Sema won't let anything through that we can't
2348 // safely compute the size of.
2349 } else {
2350 CharUnits elementSize;
2351 // Handle GCC extension for pointer arithmetic on void* and
2352 // function pointer types.
2353 if (elementType->isVoidType() || elementType->isFunctionType())
2354 elementSize = CharUnits::One();
2355 else
2356 elementSize = CGF.getContext().getTypeSizeInChars(elementType);
2357
2358 // Don't even emit the divide for element size of 1.
2359 if (elementSize.isOne())
2360 return diffInChars;
2361
2362 divisor = CGF.CGM.getSize(elementSize);
Chris Lattner7f02f722007-08-24 05:35:26 +00002363 }
Chris Lattner2cb42222011-03-01 00:03:48 +00002364
Chris Lattner2cb42222011-03-01 00:03:48 +00002365 // Otherwise, do a full sdiv. This uses the "exact" form of sdiv, since
2366 // pointer difference in C is only defined in the case where both operands
2367 // are pointing to elements of an array.
John McCall913dab22011-06-25 01:32:37 +00002368 return Builder.CreateExactSDiv(diffInChars, divisor, "sub.ptr.div");
Chris Lattner7f02f722007-08-24 05:35:26 +00002369}
2370
David Tweed7a834212013-01-07 16:43:27 +00002371Value *ScalarExprEmitter::GetWidthMinusOneValue(Value* LHS,Value* RHS) {
David Tweedf20318f2013-01-10 09:11:33 +00002372 llvm::IntegerType *Ty;
2373 if (llvm::VectorType *VT = dyn_cast<llvm::VectorType>(LHS->getType()))
2374 Ty = cast<llvm::IntegerType>(VT->getElementType());
2375 else
2376 Ty = cast<llvm::IntegerType>(LHS->getType());
2377 return llvm::ConstantInt::get(RHS->getType(), Ty->getBitWidth() - 1);
David Tweed7a834212013-01-07 16:43:27 +00002378}
2379
Chris Lattner7f02f722007-08-24 05:35:26 +00002380Value *ScalarExprEmitter::EmitShl(const BinOpInfo &Ops) {
2381 // LLVM requires the LHS and RHS to be the same type: promote or truncate the
2382 // RHS to the same size as the LHS.
2383 Value *RHS = Ops.RHS;
2384 if (Ops.LHS->getType() != RHS->getType())
2385 RHS = Builder.CreateIntCast(RHS, Ops.LHS->getType(), false, "sh_prom");
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002386
Will Dietz4f45bc02013-01-18 11:30:38 +00002387 if (CGF.SanOpts->Shift && !CGF.getLangOpts().OpenCL &&
2388 isa<llvm::IntegerType>(Ops.LHS->getType())) {
David Tweed7a834212013-01-07 16:43:27 +00002389 llvm::Value *WidthMinusOne = GetWidthMinusOneValue(Ops.LHS, RHS);
Richard Smith4def70d2012-10-09 19:52:38 +00002390 // FIXME: Emit the branching explicitly rather than emitting the check
2391 // twice.
2392 EmitBinOpCheck(Builder.CreateICmpULE(RHS, WidthMinusOne), Ops);
Richard Smith9d3e2262012-08-25 00:32:28 +00002393
2394 if (Ops.Ty->hasSignedIntegerRepresentation()) {
2395 // Check whether we are shifting any non-zero bits off the top of the
2396 // integer.
Richard Smith9d3e2262012-08-25 00:32:28 +00002397 llvm::Value *BitsShiftedOff =
2398 Builder.CreateLShr(Ops.LHS,
2399 Builder.CreateSub(WidthMinusOne, RHS, "shl.zeros",
2400 /*NUW*/true, /*NSW*/true),
2401 "shl.check");
2402 if (CGF.getLangOpts().CPlusPlus) {
2403 // In C99, we are not permitted to shift a 1 bit into the sign bit.
2404 // Under C++11's rules, shifting a 1 bit into the sign bit is
2405 // OK, but shifting a 1 bit out of it is not. (C89 and C++03 don't
2406 // define signed left shifts, so we use the C99 and C++11 rules there).
2407 llvm::Value *One = llvm::ConstantInt::get(BitsShiftedOff->getType(), 1);
2408 BitsShiftedOff = Builder.CreateLShr(BitsShiftedOff, One);
2409 }
2410 llvm::Value *Zero = llvm::ConstantInt::get(BitsShiftedOff->getType(), 0);
Richard Smith4def70d2012-10-09 19:52:38 +00002411 EmitBinOpCheck(Builder.CreateICmpEQ(BitsShiftedOff, Zero), Ops);
Richard Smith9d3e2262012-08-25 00:32:28 +00002412 }
Mike Stumpbe07f602009-12-14 21:58:14 +00002413 }
David Tweed7a834212013-01-07 16:43:27 +00002414 // OpenCL 6.3j: shift values are effectively % word size of LHS.
2415 if (CGF.getLangOpts().OpenCL)
2416 RHS = Builder.CreateAnd(RHS, GetWidthMinusOneValue(Ops.LHS, RHS), "shl.mask");
Mike Stumpbe07f602009-12-14 21:58:14 +00002417
Chris Lattner7f02f722007-08-24 05:35:26 +00002418 return Builder.CreateShl(Ops.LHS, RHS, "shl");
2419}
2420
2421Value *ScalarExprEmitter::EmitShr(const BinOpInfo &Ops) {
2422 // LLVM requires the LHS and RHS to be the same type: promote or truncate the
2423 // RHS to the same size as the LHS.
2424 Value *RHS = Ops.RHS;
2425 if (Ops.LHS->getType() != RHS->getType())
2426 RHS = Builder.CreateIntCast(RHS, Ops.LHS->getType(), false, "sh_prom");
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002427
Will Dietz4f45bc02013-01-18 11:30:38 +00002428 if (CGF.SanOpts->Shift && !CGF.getLangOpts().OpenCL &&
2429 isa<llvm::IntegerType>(Ops.LHS->getType()))
David Tweed7a834212013-01-07 16:43:27 +00002430 EmitBinOpCheck(Builder.CreateICmpULE(RHS, GetWidthMinusOneValue(Ops.LHS, RHS)), Ops);
2431
2432 // OpenCL 6.3j: shift values are effectively % word size of LHS.
2433 if (CGF.getLangOpts().OpenCL)
2434 RHS = Builder.CreateAnd(RHS, GetWidthMinusOneValue(Ops.LHS, RHS), "shr.mask");
Mike Stumpbe07f602009-12-14 21:58:14 +00002435
Douglas Gregorf6094622010-07-23 15:58:24 +00002436 if (Ops.Ty->hasUnsignedIntegerRepresentation())
Chris Lattner7f02f722007-08-24 05:35:26 +00002437 return Builder.CreateLShr(Ops.LHS, RHS, "shr");
2438 return Builder.CreateAShr(Ops.LHS, RHS, "shr");
2439}
2440
Anton Yartsevaa4fe052010-11-18 03:19:30 +00002441enum IntrinsicType { VCMPEQ, VCMPGT };
2442// return corresponding comparison intrinsic for given vector type
2443static llvm::Intrinsic::ID GetIntrinsic(IntrinsicType IT,
2444 BuiltinType::Kind ElemKind) {
2445 switch (ElemKind) {
David Blaikieb219cfc2011-09-23 05:06:16 +00002446 default: llvm_unreachable("unexpected element type");
Anton Yartsevaa4fe052010-11-18 03:19:30 +00002447 case BuiltinType::Char_U:
2448 case BuiltinType::UChar:
2449 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequb_p :
2450 llvm::Intrinsic::ppc_altivec_vcmpgtub_p;
Anton Yartsevaa4fe052010-11-18 03:19:30 +00002451 case BuiltinType::Char_S:
2452 case BuiltinType::SChar:
2453 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequb_p :
2454 llvm::Intrinsic::ppc_altivec_vcmpgtsb_p;
Anton Yartsevaa4fe052010-11-18 03:19:30 +00002455 case BuiltinType::UShort:
2456 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequh_p :
2457 llvm::Intrinsic::ppc_altivec_vcmpgtuh_p;
Anton Yartsevaa4fe052010-11-18 03:19:30 +00002458 case BuiltinType::Short:
2459 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequh_p :
2460 llvm::Intrinsic::ppc_altivec_vcmpgtsh_p;
Anton Yartsevaa4fe052010-11-18 03:19:30 +00002461 case BuiltinType::UInt:
2462 case BuiltinType::ULong:
2463 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequw_p :
2464 llvm::Intrinsic::ppc_altivec_vcmpgtuw_p;
Anton Yartsevaa4fe052010-11-18 03:19:30 +00002465 case BuiltinType::Int:
2466 case BuiltinType::Long:
2467 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpequw_p :
2468 llvm::Intrinsic::ppc_altivec_vcmpgtsw_p;
Anton Yartsevaa4fe052010-11-18 03:19:30 +00002469 case BuiltinType::Float:
2470 return (IT == VCMPEQ) ? llvm::Intrinsic::ppc_altivec_vcmpeqfp_p :
2471 llvm::Intrinsic::ppc_altivec_vcmpgtfp_p;
Anton Yartsevaa4fe052010-11-18 03:19:30 +00002472 }
Anton Yartsevaa4fe052010-11-18 03:19:30 +00002473}
2474
Chris Lattner7f02f722007-08-24 05:35:26 +00002475Value *ScalarExprEmitter::EmitCompare(const BinaryOperator *E,unsigned UICmpOpc,
2476 unsigned SICmpOpc, unsigned FCmpOpc) {
Mike Stump7f79f9b2009-05-29 15:46:01 +00002477 TestAndClearIgnoreResultAssign();
Chris Lattner4f1a7b32007-08-26 16:34:22 +00002478 Value *Result;
Chris Lattner7f02f722007-08-24 05:35:26 +00002479 QualType LHSTy = E->getLHS()->getType();
John McCall0bab0cd2010-08-23 01:21:21 +00002480 if (const MemberPointerType *MPT = LHSTy->getAs<MemberPointerType>()) {
John McCall2de56d12010-08-25 11:45:40 +00002481 assert(E->getOpcode() == BO_EQ ||
2482 E->getOpcode() == BO_NE);
John McCalld608cdb2010-08-22 10:59:02 +00002483 Value *LHS = CGF.EmitScalarExpr(E->getLHS());
2484 Value *RHS = CGF.EmitScalarExpr(E->getRHS());
John McCall0bab0cd2010-08-23 01:21:21 +00002485 Result = CGF.CGM.getCXXABI().EmitMemberPointerComparison(
John McCall2de56d12010-08-25 11:45:40 +00002486 CGF, LHS, RHS, MPT, E->getOpcode() == BO_NE);
Eli Friedmanb81c7862009-12-11 07:36:43 +00002487 } else if (!LHSTy->isAnyComplexType()) {
Chris Lattner7f02f722007-08-24 05:35:26 +00002488 Value *LHS = Visit(E->getLHS());
2489 Value *RHS = Visit(E->getRHS());
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002490
Anton Yartsevaa4fe052010-11-18 03:19:30 +00002491 // If AltiVec, the comparison results in a numeric type, so we use
2492 // intrinsics comparing vectors and giving 0 or 1 as a result
Anton Yartsev6305f722011-03-28 21:00:05 +00002493 if (LHSTy->isVectorType() && !E->getType()->isVectorType()) {
Anton Yartsevaa4fe052010-11-18 03:19:30 +00002494 // constants for mapping CR6 register bits to predicate result
2495 enum { CR6_EQ=0, CR6_EQ_REV, CR6_LT, CR6_LT_REV } CR6;
2496
2497 llvm::Intrinsic::ID ID = llvm::Intrinsic::not_intrinsic;
2498
2499 // in several cases vector arguments order will be reversed
2500 Value *FirstVecArg = LHS,
2501 *SecondVecArg = RHS;
2502
2503 QualType ElTy = LHSTy->getAs<VectorType>()->getElementType();
John McCallf4c73712011-01-19 06:33:43 +00002504 const BuiltinType *BTy = ElTy->getAs<BuiltinType>();
Anton Yartsevaa4fe052010-11-18 03:19:30 +00002505 BuiltinType::Kind ElementKind = BTy->getKind();
2506
2507 switch(E->getOpcode()) {
David Blaikieb219cfc2011-09-23 05:06:16 +00002508 default: llvm_unreachable("is not a comparison operation");
Anton Yartsevaa4fe052010-11-18 03:19:30 +00002509 case BO_EQ:
2510 CR6 = CR6_LT;
2511 ID = GetIntrinsic(VCMPEQ, ElementKind);
2512 break;
2513 case BO_NE:
2514 CR6 = CR6_EQ;
2515 ID = GetIntrinsic(VCMPEQ, ElementKind);
2516 break;
2517 case BO_LT:
2518 CR6 = CR6_LT;
2519 ID = GetIntrinsic(VCMPGT, ElementKind);
2520 std::swap(FirstVecArg, SecondVecArg);
2521 break;
2522 case BO_GT:
2523 CR6 = CR6_LT;
2524 ID = GetIntrinsic(VCMPGT, ElementKind);
2525 break;
2526 case BO_LE:
2527 if (ElementKind == BuiltinType::Float) {
2528 CR6 = CR6_LT;
2529 ID = llvm::Intrinsic::ppc_altivec_vcmpgefp_p;
2530 std::swap(FirstVecArg, SecondVecArg);
2531 }
2532 else {
2533 CR6 = CR6_EQ;
2534 ID = GetIntrinsic(VCMPGT, ElementKind);
2535 }
2536 break;
2537 case BO_GE:
2538 if (ElementKind == BuiltinType::Float) {
2539 CR6 = CR6_LT;
2540 ID = llvm::Intrinsic::ppc_altivec_vcmpgefp_p;
2541 }
2542 else {
2543 CR6 = CR6_EQ;
2544 ID = GetIntrinsic(VCMPGT, ElementKind);
2545 std::swap(FirstVecArg, SecondVecArg);
2546 }
2547 break;
2548 }
2549
Chris Lattner48431f92011-04-19 22:55:03 +00002550 Value *CR6Param = Builder.getInt32(CR6);
Anton Yartsevaa4fe052010-11-18 03:19:30 +00002551 llvm::Function *F = CGF.CGM.getIntrinsic(ID);
2552 Result = Builder.CreateCall3(F, CR6Param, FirstVecArg, SecondVecArg, "");
2553 return EmitScalarConversion(Result, CGF.getContext().BoolTy, E->getType());
2554 }
2555
Duncan Sandsf177d9d2010-02-15 16:14:01 +00002556 if (LHS->getType()->isFPOrFPVectorTy()) {
Nate Begeman7a66d7b2008-07-25 20:16:05 +00002557 Result = Builder.CreateFCmp((llvm::CmpInst::Predicate)FCmpOpc,
Chris Lattner7f02f722007-08-24 05:35:26 +00002558 LHS, RHS, "cmp");
Douglas Gregorf6094622010-07-23 15:58:24 +00002559 } else if (LHSTy->hasSignedIntegerRepresentation()) {
Eli Friedmanec2c1262008-05-29 15:09:15 +00002560 Result = Builder.CreateICmp((llvm::ICmpInst::Predicate)SICmpOpc,
Chris Lattner7f02f722007-08-24 05:35:26 +00002561 LHS, RHS, "cmp");
2562 } else {
Eli Friedmanec2c1262008-05-29 15:09:15 +00002563 // Unsigned integers and pointers.
2564 Result = Builder.CreateICmp((llvm::ICmpInst::Predicate)UICmpOpc,
Chris Lattner7f02f722007-08-24 05:35:26 +00002565 LHS, RHS, "cmp");
2566 }
Chris Lattner9c10fcf2009-07-08 01:08:03 +00002567
2568 // If this is a vector comparison, sign extend the result to the appropriate
2569 // vector integer type and return it (don't convert to bool).
2570 if (LHSTy->isVectorType())
2571 return Builder.CreateSExt(Result, ConvertType(E->getType()), "sext");
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002572
Chris Lattner7f02f722007-08-24 05:35:26 +00002573 } else {
2574 // Complex Comparison: can only be an equality comparison.
2575 CodeGenFunction::ComplexPairTy LHS = CGF.EmitComplexExpr(E->getLHS());
2576 CodeGenFunction::ComplexPairTy RHS = CGF.EmitComplexExpr(E->getRHS());
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002577
John McCall183700f2009-09-21 23:43:11 +00002578 QualType CETy = LHSTy->getAs<ComplexType>()->getElementType();
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002579
Chris Lattner4f1a7b32007-08-26 16:34:22 +00002580 Value *ResultR, *ResultI;
Chris Lattner7f02f722007-08-24 05:35:26 +00002581 if (CETy->isRealFloatingType()) {
2582 ResultR = Builder.CreateFCmp((llvm::FCmpInst::Predicate)FCmpOpc,
2583 LHS.first, RHS.first, "cmp.r");
2584 ResultI = Builder.CreateFCmp((llvm::FCmpInst::Predicate)FCmpOpc,
2585 LHS.second, RHS.second, "cmp.i");
2586 } else {
2587 // Complex comparisons can only be equality comparisons. As such, signed
2588 // and unsigned opcodes are the same.
2589 ResultR = Builder.CreateICmp((llvm::ICmpInst::Predicate)UICmpOpc,
2590 LHS.first, RHS.first, "cmp.r");
2591 ResultI = Builder.CreateICmp((llvm::ICmpInst::Predicate)UICmpOpc,
2592 LHS.second, RHS.second, "cmp.i");
2593 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002594
John McCall2de56d12010-08-25 11:45:40 +00002595 if (E->getOpcode() == BO_EQ) {
Chris Lattner7f02f722007-08-24 05:35:26 +00002596 Result = Builder.CreateAnd(ResultR, ResultI, "and.ri");
2597 } else {
John McCall2de56d12010-08-25 11:45:40 +00002598 assert(E->getOpcode() == BO_NE &&
Chris Lattner7f02f722007-08-24 05:35:26 +00002599 "Complex comparison other than == or != ?");
2600 Result = Builder.CreateOr(ResultR, ResultI, "or.ri");
2601 }
2602 }
Nuno Lopes32f62092009-01-11 23:22:37 +00002603
2604 return EmitScalarConversion(Result, CGF.getContext().BoolTy, E->getType());
Chris Lattner7f02f722007-08-24 05:35:26 +00002605}
2606
2607Value *ScalarExprEmitter::VisitBinAssign(const BinaryOperator *E) {
Mike Stump7f79f9b2009-05-29 15:46:01 +00002608 bool Ignore = TestAndClearIgnoreResultAssign();
2609
John McCallf85e1932011-06-15 23:02:42 +00002610 Value *RHS;
2611 LValue LHS;
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002612
John McCallf85e1932011-06-15 23:02:42 +00002613 switch (E->getLHS()->getType().getObjCLifetime()) {
2614 case Qualifiers::OCL_Strong:
2615 llvm::tie(LHS, RHS) = CGF.EmitARCStoreStrong(E, Ignore);
2616 break;
2617
2618 case Qualifiers::OCL_Autoreleasing:
2619 llvm::tie(LHS,RHS) = CGF.EmitARCStoreAutoreleasing(E);
2620 break;
2621
2622 case Qualifiers::OCL_Weak:
2623 RHS = Visit(E->getRHS());
Richard Smith7ac9ef12012-09-08 02:08:36 +00002624 LHS = EmitCheckedLValue(E->getLHS(), CodeGenFunction::TCK_Store);
John McCallf85e1932011-06-15 23:02:42 +00002625 RHS = CGF.EmitARCStoreWeak(LHS.getAddress(), RHS, Ignore);
2626 break;
2627
2628 // No reason to do any of these differently.
2629 case Qualifiers::OCL_None:
2630 case Qualifiers::OCL_ExplicitNone:
2631 // __block variables need to have the rhs evaluated first, plus
2632 // this should improve codegen just a little.
2633 RHS = Visit(E->getRHS());
Richard Smith7ac9ef12012-09-08 02:08:36 +00002634 LHS = EmitCheckedLValue(E->getLHS(), CodeGenFunction::TCK_Store);
John McCallf85e1932011-06-15 23:02:42 +00002635
2636 // Store the value into the LHS. Bit-fields are handled specially
2637 // because the result is altered by the store, i.e., [C99 6.5.16p1]
2638 // 'An assignment expression has the value of the left operand after
2639 // the assignment...'.
2640 if (LHS.isBitField())
John McCall545d9962011-06-25 02:11:03 +00002641 CGF.EmitStoreThroughBitfieldLValue(RValue::get(RHS), LHS, &RHS);
John McCallf85e1932011-06-15 23:02:42 +00002642 else
John McCall545d9962011-06-25 02:11:03 +00002643 CGF.EmitStoreThroughLValue(RValue::get(RHS), LHS);
John McCallf85e1932011-06-15 23:02:42 +00002644 }
Daniel Dunbard7f7d082010-06-29 22:00:45 +00002645
2646 // If the result is clearly ignored, return now.
Mike Stump7f79f9b2009-05-29 15:46:01 +00002647 if (Ignore)
2648 return 0;
Daniel Dunbard7f7d082010-06-29 22:00:45 +00002649
John McCallb418d742010-11-16 10:08:07 +00002650 // The result of an assignment in C is the assigned r-value.
Richard Smith7edf9e32012-11-01 22:30:59 +00002651 if (!CGF.getLangOpts().CPlusPlus)
John McCallb418d742010-11-16 10:08:07 +00002652 return RHS;
2653
Daniel Dunbard7f7d082010-06-29 22:00:45 +00002654 // If the lvalue is non-volatile, return the computed value of the assignment.
2655 if (!LHS.isVolatileQualified())
2656 return RHS;
2657
2658 // Otherwise, reload the value.
John McCall545d9962011-06-25 02:11:03 +00002659 return EmitLoadOfLValue(LHS);
Chris Lattner7f02f722007-08-24 05:35:26 +00002660}
2661
2662Value *ScalarExprEmitter::VisitBinLAnd(const BinaryOperator *E) {
Tanya Lattner4f692c22012-01-16 21:02:28 +00002663
2664 // Perform vector logical and on comparisons with zero vectors.
2665 if (E->getType()->isVectorType()) {
2666 Value *LHS = Visit(E->getLHS());
2667 Value *RHS = Visit(E->getRHS());
2668 Value *Zero = llvm::ConstantAggregateZero::get(LHS->getType());
2669 LHS = Builder.CreateICmp(llvm::CmpInst::ICMP_NE, LHS, Zero, "cmp");
2670 RHS = Builder.CreateICmp(llvm::CmpInst::ICMP_NE, RHS, Zero, "cmp");
2671 Value *And = Builder.CreateAnd(LHS, RHS);
2672 return Builder.CreateSExt(And, Zero->getType(), "sext");
2673 }
2674
Chris Lattner2acc6e32011-07-18 04:24:23 +00002675 llvm::Type *ResTy = ConvertType(E->getType());
Chris Lattner7804bcb2009-10-17 04:24:20 +00002676
Chris Lattner20eb09d2008-11-12 08:26:50 +00002677 // If we have 0 && RHS, see if we can elide RHS, if so, just return 0.
2678 // If we have 1 && X, just emit X without inserting the control flow.
Chris Lattnerc2c90012011-02-27 23:02:32 +00002679 bool LHSCondVal;
2680 if (CGF.ConstantFoldsToSimpleInteger(E->getLHS(), LHSCondVal)) {
2681 if (LHSCondVal) { // If we have 1 && X, just emit X.
Chris Lattner0946ccd2008-11-11 07:41:27 +00002682 Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS());
Chris Lattner7804bcb2009-10-17 04:24:20 +00002683 // ZExt result to int or bool.
2684 return Builder.CreateZExtOrBitCast(RHSCond, ResTy, "land.ext");
Chris Lattner0946ccd2008-11-11 07:41:27 +00002685 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002686
Chris Lattner7804bcb2009-10-17 04:24:20 +00002687 // 0 && RHS: If it is safe, just elide the RHS, and return 0/false.
Chris Lattner20eb09d2008-11-12 08:26:50 +00002688 if (!CGF.ContainsLabel(E->getRHS()))
Chris Lattner7804bcb2009-10-17 04:24:20 +00002689 return llvm::Constant::getNullValue(ResTy);
Chris Lattner0946ccd2008-11-11 07:41:27 +00002690 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002691
Daniel Dunbar9615ecb2008-11-13 01:38:36 +00002692 llvm::BasicBlock *ContBlock = CGF.createBasicBlock("land.end");
2693 llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("land.rhs");
Chris Lattner20eb09d2008-11-12 08:26:50 +00002694
John McCall150b4622011-01-26 04:00:11 +00002695 CodeGenFunction::ConditionalEvaluation eval(CGF);
2696
Chris Lattnerf7b5ea92008-11-12 08:38:24 +00002697 // Branch on the LHS first. If it is false, go to the failure (cont) block.
2698 CGF.EmitBranchOnBoolExpr(E->getLHS(), RHSBlock, ContBlock);
2699
2700 // Any edges into the ContBlock are now from an (indeterminate number of)
2701 // edges from this first condition. All of these values will be false. Start
2702 // setting up the PHI node in the Cont Block for this.
Jay Foadbbf3bac2011-03-30 11:28:58 +00002703 llvm::PHINode *PN = llvm::PHINode::Create(llvm::Type::getInt1Ty(VMContext), 2,
Owen Anderson0032b272009-08-13 21:57:51 +00002704 "", ContBlock);
Chris Lattnerf7b5ea92008-11-12 08:38:24 +00002705 for (llvm::pred_iterator PI = pred_begin(ContBlock), PE = pred_end(ContBlock);
2706 PI != PE; ++PI)
Owen Anderson3b144ba2009-07-31 17:39:36 +00002707 PN->addIncoming(llvm::ConstantInt::getFalse(VMContext), *PI);
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002708
John McCall150b4622011-01-26 04:00:11 +00002709 eval.begin(CGF);
Chris Lattner7f02f722007-08-24 05:35:26 +00002710 CGF.EmitBlock(RHSBlock);
2711 Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS());
John McCall150b4622011-01-26 04:00:11 +00002712 eval.end(CGF);
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002713
Chris Lattner7f02f722007-08-24 05:35:26 +00002714 // Reaquire the RHS block, as there may be subblocks inserted.
2715 RHSBlock = Builder.GetInsertBlock();
Chris Lattnerf7b5ea92008-11-12 08:38:24 +00002716
2717 // Emit an unconditional branch from this block to ContBlock. Insert an entry
2718 // into the phi node for the edge with the value of RHSCond.
Devang Patelacd72362011-03-30 00:08:31 +00002719 if (CGF.getDebugInfo())
2720 // There is no need to emit line number for unconditional branch.
2721 Builder.SetCurrentDebugLocation(llvm::DebugLoc());
Chris Lattner7f02f722007-08-24 05:35:26 +00002722 CGF.EmitBlock(ContBlock);
Chris Lattner7f02f722007-08-24 05:35:26 +00002723 PN->addIncoming(RHSCond, RHSBlock);
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002724
Chris Lattner7f02f722007-08-24 05:35:26 +00002725 // ZExt result to int.
Chris Lattner7804bcb2009-10-17 04:24:20 +00002726 return Builder.CreateZExtOrBitCast(PN, ResTy, "land.ext");
Chris Lattner7f02f722007-08-24 05:35:26 +00002727}
2728
2729Value *ScalarExprEmitter::VisitBinLOr(const BinaryOperator *E) {
Tanya Lattner4f692c22012-01-16 21:02:28 +00002730
2731 // Perform vector logical or on comparisons with zero vectors.
2732 if (E->getType()->isVectorType()) {
2733 Value *LHS = Visit(E->getLHS());
2734 Value *RHS = Visit(E->getRHS());
2735 Value *Zero = llvm::ConstantAggregateZero::get(LHS->getType());
2736 LHS = Builder.CreateICmp(llvm::CmpInst::ICMP_NE, LHS, Zero, "cmp");
2737 RHS = Builder.CreateICmp(llvm::CmpInst::ICMP_NE, RHS, Zero, "cmp");
2738 Value *Or = Builder.CreateOr(LHS, RHS);
2739 return Builder.CreateSExt(Or, Zero->getType(), "sext");
2740 }
2741
Chris Lattner2acc6e32011-07-18 04:24:23 +00002742 llvm::Type *ResTy = ConvertType(E->getType());
Chris Lattner7804bcb2009-10-17 04:24:20 +00002743
Chris Lattner20eb09d2008-11-12 08:26:50 +00002744 // If we have 1 || RHS, see if we can elide RHS, if so, just return 1.
2745 // If we have 0 || X, just emit X without inserting the control flow.
Chris Lattnerc2c90012011-02-27 23:02:32 +00002746 bool LHSCondVal;
2747 if (CGF.ConstantFoldsToSimpleInteger(E->getLHS(), LHSCondVal)) {
2748 if (!LHSCondVal) { // If we have 0 || X, just emit X.
Chris Lattner0946ccd2008-11-11 07:41:27 +00002749 Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS());
Chris Lattner7804bcb2009-10-17 04:24:20 +00002750 // ZExt result to int or bool.
2751 return Builder.CreateZExtOrBitCast(RHSCond, ResTy, "lor.ext");
Chris Lattner0946ccd2008-11-11 07:41:27 +00002752 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002753
Chris Lattner7804bcb2009-10-17 04:24:20 +00002754 // 1 || RHS: If it is safe, just elide the RHS, and return 1/true.
Chris Lattner20eb09d2008-11-12 08:26:50 +00002755 if (!CGF.ContainsLabel(E->getRHS()))
Chris Lattner7804bcb2009-10-17 04:24:20 +00002756 return llvm::ConstantInt::get(ResTy, 1);
Chris Lattner0946ccd2008-11-11 07:41:27 +00002757 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002758
Daniel Dunbar9615ecb2008-11-13 01:38:36 +00002759 llvm::BasicBlock *ContBlock = CGF.createBasicBlock("lor.end");
2760 llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("lor.rhs");
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002761
John McCall150b4622011-01-26 04:00:11 +00002762 CodeGenFunction::ConditionalEvaluation eval(CGF);
2763
Chris Lattnerf7b5ea92008-11-12 08:38:24 +00002764 // Branch on the LHS first. If it is true, go to the success (cont) block.
2765 CGF.EmitBranchOnBoolExpr(E->getLHS(), ContBlock, RHSBlock);
2766
2767 // Any edges into the ContBlock are now from an (indeterminate number of)
2768 // edges from this first condition. All of these values will be true. Start
2769 // setting up the PHI node in the Cont Block for this.
Jay Foadbbf3bac2011-03-30 11:28:58 +00002770 llvm::PHINode *PN = llvm::PHINode::Create(llvm::Type::getInt1Ty(VMContext), 2,
Owen Anderson0032b272009-08-13 21:57:51 +00002771 "", ContBlock);
Chris Lattnerf7b5ea92008-11-12 08:38:24 +00002772 for (llvm::pred_iterator PI = pred_begin(ContBlock), PE = pred_end(ContBlock);
2773 PI != PE; ++PI)
Owen Anderson3b144ba2009-07-31 17:39:36 +00002774 PN->addIncoming(llvm::ConstantInt::getTrue(VMContext), *PI);
Chris Lattnerf7b5ea92008-11-12 08:38:24 +00002775
John McCall150b4622011-01-26 04:00:11 +00002776 eval.begin(CGF);
Anders Carlsson33da07d2009-06-04 02:53:13 +00002777
Chris Lattnerf7b5ea92008-11-12 08:38:24 +00002778 // Emit the RHS condition as a bool value.
Chris Lattner7f02f722007-08-24 05:35:26 +00002779 CGF.EmitBlock(RHSBlock);
2780 Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS());
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002781
John McCall150b4622011-01-26 04:00:11 +00002782 eval.end(CGF);
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002783
Chris Lattner7f02f722007-08-24 05:35:26 +00002784 // Reaquire the RHS block, as there may be subblocks inserted.
2785 RHSBlock = Builder.GetInsertBlock();
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002786
Chris Lattnerf7b5ea92008-11-12 08:38:24 +00002787 // Emit an unconditional branch from this block to ContBlock. Insert an entry
2788 // into the phi node for the edge with the value of RHSCond.
2789 CGF.EmitBlock(ContBlock);
Chris Lattner7f02f722007-08-24 05:35:26 +00002790 PN->addIncoming(RHSCond, RHSBlock);
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002791
Chris Lattner7f02f722007-08-24 05:35:26 +00002792 // ZExt result to int.
Chris Lattner7804bcb2009-10-17 04:24:20 +00002793 return Builder.CreateZExtOrBitCast(PN, ResTy, "lor.ext");
Chris Lattner7f02f722007-08-24 05:35:26 +00002794}
2795
2796Value *ScalarExprEmitter::VisitBinComma(const BinaryOperator *E) {
John McCall2a416372010-12-05 02:00:02 +00002797 CGF.EmitIgnoredExpr(E->getLHS());
Daniel Dunbara448fb22008-11-11 23:11:34 +00002798 CGF.EnsureInsertPoint();
Chris Lattner7f02f722007-08-24 05:35:26 +00002799 return Visit(E->getRHS());
2800}
2801
2802//===----------------------------------------------------------------------===//
2803// Other Operators
2804//===----------------------------------------------------------------------===//
2805
Chris Lattner9802a512008-11-12 08:55:54 +00002806/// isCheapEnoughToEvaluateUnconditionally - Return true if the specified
2807/// expression is cheap enough and side-effect-free enough to evaluate
2808/// unconditionally instead of conditionally. This is used to convert control
2809/// flow into selects in some cases.
Mike Stumpdf317bf2009-11-03 23:25:48 +00002810static bool isCheapEnoughToEvaluateUnconditionally(const Expr *E,
2811 CodeGenFunction &CGF) {
Peter Collingbournef111d932011-04-15 00:35:48 +00002812 E = E->IgnoreParens();
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002813
Chris Lattnerc6bea672011-04-16 23:15:35 +00002814 // Anything that is an integer or floating point constant is fine.
2815 if (E->isConstantInitializer(CGF.getContext(), false))
Chris Lattner9802a512008-11-12 08:55:54 +00002816 return true;
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002817
Chris Lattner9802a512008-11-12 08:55:54 +00002818 // Non-volatile automatic variables too, to get "cond ? X : Y" where
2819 // X and Y are local variables.
2820 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E))
2821 if (const VarDecl *VD = dyn_cast<VarDecl>(DRE->getDecl()))
Mike Stumpdf317bf2009-11-03 23:25:48 +00002822 if (VD->hasLocalStorage() && !(CGF.getContext()
2823 .getCanonicalType(VD->getType())
2824 .isVolatileQualified()))
Chris Lattner9802a512008-11-12 08:55:54 +00002825 return true;
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002826
Chris Lattner9802a512008-11-12 08:55:54 +00002827 return false;
2828}
2829
2830
Chris Lattner7f02f722007-08-24 05:35:26 +00002831Value *ScalarExprEmitter::
John McCall56ca35d2011-02-17 10:25:35 +00002832VisitAbstractConditionalOperator(const AbstractConditionalOperator *E) {
Mike Stump7f79f9b2009-05-29 15:46:01 +00002833 TestAndClearIgnoreResultAssign();
John McCall56ca35d2011-02-17 10:25:35 +00002834
2835 // Bind the common expression if necessary.
Eli Friedmand97927d2012-01-06 20:42:20 +00002836 CodeGenFunction::OpaqueValueMapping binding(CGF, E);
John McCall56ca35d2011-02-17 10:25:35 +00002837
2838 Expr *condExpr = E->getCond();
2839 Expr *lhsExpr = E->getTrueExpr();
2840 Expr *rhsExpr = E->getFalseExpr();
2841
Chris Lattner31a09842008-11-12 08:04:58 +00002842 // If the condition constant folds and can be elided, try to avoid emitting
2843 // the condition and the dead arm.
Chris Lattnerc2c90012011-02-27 23:02:32 +00002844 bool CondExprBool;
2845 if (CGF.ConstantFoldsToSimpleInteger(condExpr, CondExprBool)) {
John McCall56ca35d2011-02-17 10:25:35 +00002846 Expr *live = lhsExpr, *dead = rhsExpr;
Chris Lattnerc2c90012011-02-27 23:02:32 +00002847 if (!CondExprBool) std::swap(live, dead);
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002848
Eli Friedmanc8645e32011-10-15 02:10:40 +00002849 // If the dead side doesn't have labels we need, just emit the Live part.
2850 if (!CGF.ContainsLabel(dead)) {
2851 Value *Result = Visit(live);
2852
2853 // If the live part is a throw expression, it acts like it has a void
2854 // type, so evaluating it returns a null Value*. However, a conditional
2855 // with non-void type must return a non-null Value*.
2856 if (!Result && !E->getType()->isVoidType())
2857 Result = llvm::UndefValue::get(CGF.ConvertType(E->getType()));
2858
2859 return Result;
2860 }
Chris Lattnerc657e922008-11-11 18:56:45 +00002861 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002862
Nate Begeman6155d732010-09-20 22:41:17 +00002863 // OpenCL: If the condition is a vector, we can treat this condition like
2864 // the select function.
Richard Smith7edf9e32012-11-01 22:30:59 +00002865 if (CGF.getLangOpts().OpenCL
John McCall56ca35d2011-02-17 10:25:35 +00002866 && condExpr->getType()->isVectorType()) {
2867 llvm::Value *CondV = CGF.EmitScalarExpr(condExpr);
2868 llvm::Value *LHS = Visit(lhsExpr);
2869 llvm::Value *RHS = Visit(rhsExpr);
Nate Begeman6155d732010-09-20 22:41:17 +00002870
Chris Lattner2acc6e32011-07-18 04:24:23 +00002871 llvm::Type *condType = ConvertType(condExpr->getType());
2872 llvm::VectorType *vecTy = cast<llvm::VectorType>(condType);
Nate Begeman6155d732010-09-20 22:41:17 +00002873
2874 unsigned numElem = vecTy->getNumElements();
Chris Lattner2acc6e32011-07-18 04:24:23 +00002875 llvm::Type *elemType = vecTy->getElementType();
Nate Begeman6155d732010-09-20 22:41:17 +00002876
Chris Lattner2ce88422012-01-25 05:34:41 +00002877 llvm::Value *zeroVec = llvm::Constant::getNullValue(vecTy);
Nate Begeman6155d732010-09-20 22:41:17 +00002878 llvm::Value *TestMSB = Builder.CreateICmpSLT(CondV, zeroVec);
2879 llvm::Value *tmp = Builder.CreateSExt(TestMSB,
2880 llvm::VectorType::get(elemType,
2881 numElem),
2882 "sext");
2883 llvm::Value *tmp2 = Builder.CreateNot(tmp);
2884
2885 // Cast float to int to perform ANDs if necessary.
2886 llvm::Value *RHSTmp = RHS;
2887 llvm::Value *LHSTmp = LHS;
2888 bool wasCast = false;
Chris Lattner2acc6e32011-07-18 04:24:23 +00002889 llvm::VectorType *rhsVTy = cast<llvm::VectorType>(RHS->getType());
Peter Collingbourne565204d2012-05-29 00:35:18 +00002890 if (rhsVTy->getElementType()->isFloatingPointTy()) {
Nate Begeman6155d732010-09-20 22:41:17 +00002891 RHSTmp = Builder.CreateBitCast(RHS, tmp2->getType());
2892 LHSTmp = Builder.CreateBitCast(LHS, tmp->getType());
2893 wasCast = true;
2894 }
2895
2896 llvm::Value *tmp3 = Builder.CreateAnd(RHSTmp, tmp2);
2897 llvm::Value *tmp4 = Builder.CreateAnd(LHSTmp, tmp);
2898 llvm::Value *tmp5 = Builder.CreateOr(tmp3, tmp4, "cond");
2899 if (wasCast)
2900 tmp5 = Builder.CreateBitCast(tmp5, RHS->getType());
2901
2902 return tmp5;
2903 }
2904
Chris Lattner9802a512008-11-12 08:55:54 +00002905 // If this is a really simple expression (like x ? 4 : 5), emit this as a
2906 // select instead of as control flow. We can only do this if it is cheap and
Chris Lattner531a5502008-11-16 06:16:27 +00002907 // safe to evaluate the LHS and RHS unconditionally.
John McCall56ca35d2011-02-17 10:25:35 +00002908 if (isCheapEnoughToEvaluateUnconditionally(lhsExpr, CGF) &&
2909 isCheapEnoughToEvaluateUnconditionally(rhsExpr, CGF)) {
2910 llvm::Value *CondV = CGF.EvaluateExprAsBool(condExpr);
2911 llvm::Value *LHS = Visit(lhsExpr);
2912 llvm::Value *RHS = Visit(rhsExpr);
Eli Friedman1e4f68c2011-12-08 22:01:56 +00002913 if (!LHS) {
2914 // If the conditional has void type, make sure we return a null Value*.
2915 assert(!RHS && "LHS and RHS types must match");
2916 return 0;
2917 }
Chris Lattner9802a512008-11-12 08:55:54 +00002918 return Builder.CreateSelect(CondV, LHS, RHS, "cond");
2919 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002920
Daniel Dunbarbe65abc2008-11-12 10:13:37 +00002921 llvm::BasicBlock *LHSBlock = CGF.createBasicBlock("cond.true");
2922 llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("cond.false");
Daniel Dunbar9615ecb2008-11-13 01:38:36 +00002923 llvm::BasicBlock *ContBlock = CGF.createBasicBlock("cond.end");
John McCall150b4622011-01-26 04:00:11 +00002924
2925 CodeGenFunction::ConditionalEvaluation eval(CGF);
John McCall56ca35d2011-02-17 10:25:35 +00002926 CGF.EmitBranchOnBoolExpr(condExpr, LHSBlock, RHSBlock);
Anders Carlssonfb6fa302009-06-04 03:00:32 +00002927
Chris Lattner7f02f722007-08-24 05:35:26 +00002928 CGF.EmitBlock(LHSBlock);
John McCall150b4622011-01-26 04:00:11 +00002929 eval.begin(CGF);
John McCall56ca35d2011-02-17 10:25:35 +00002930 Value *LHS = Visit(lhsExpr);
John McCall150b4622011-01-26 04:00:11 +00002931 eval.end(CGF);
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002932
Chris Lattner7f02f722007-08-24 05:35:26 +00002933 LHSBlock = Builder.GetInsertBlock();
John McCall150b4622011-01-26 04:00:11 +00002934 Builder.CreateBr(ContBlock);
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002935
Chris Lattner7f02f722007-08-24 05:35:26 +00002936 CGF.EmitBlock(RHSBlock);
John McCall150b4622011-01-26 04:00:11 +00002937 eval.begin(CGF);
John McCall56ca35d2011-02-17 10:25:35 +00002938 Value *RHS = Visit(rhsExpr);
John McCall150b4622011-01-26 04:00:11 +00002939 eval.end(CGF);
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002940
John McCall150b4622011-01-26 04:00:11 +00002941 RHSBlock = Builder.GetInsertBlock();
Chris Lattner7f02f722007-08-24 05:35:26 +00002942 CGF.EmitBlock(ContBlock);
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002943
Eli Friedman48daf592009-12-07 20:25:53 +00002944 // If the LHS or RHS is a throw expression, it will be legitimately null.
2945 if (!LHS)
2946 return RHS;
2947 if (!RHS)
2948 return LHS;
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002949
Chris Lattner7f02f722007-08-24 05:35:26 +00002950 // Create a PHI node for the real part.
Jay Foadbbf3bac2011-03-30 11:28:58 +00002951 llvm::PHINode *PN = Builder.CreatePHI(LHS->getType(), 2, "cond");
Chris Lattner7f02f722007-08-24 05:35:26 +00002952 PN->addIncoming(LHS, LHSBlock);
2953 PN->addIncoming(RHS, RHSBlock);
2954 return PN;
2955}
2956
2957Value *ScalarExprEmitter::VisitChooseExpr(ChooseExpr *E) {
Eli Friedman79769322009-03-04 05:52:32 +00002958 return Visit(E->getChosenSubExpr(CGF.getContext()));
Chris Lattner7f02f722007-08-24 05:35:26 +00002959}
2960
Chris Lattner2202bce2007-11-30 17:56:23 +00002961Value *ScalarExprEmitter::VisitVAArgExpr(VAArgExpr *VE) {
Eli Friedman4fd0aa52009-01-20 17:46:04 +00002962 llvm::Value *ArgValue = CGF.EmitVAListRef(VE->getSubExpr());
Anders Carlssonddf7cac2008-11-04 05:30:00 +00002963 llvm::Value *ArgPtr = CGF.EmitVAArg(ArgValue, VE->getType());
2964
2965 // If EmitVAArg fails, we fall back to the LLVM instruction.
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002966 if (!ArgPtr)
Anders Carlssonddf7cac2008-11-04 05:30:00 +00002967 return Builder.CreateVAArg(ArgValue, ConvertType(VE->getType()));
2968
Mike Stump7f79f9b2009-05-29 15:46:01 +00002969 // FIXME Volatility.
Anders Carlssonddf7cac2008-11-04 05:30:00 +00002970 return Builder.CreateLoad(ArgPtr);
Anders Carlsson7c50aca2007-10-15 20:28:48 +00002971}
2972
John McCall6b5a61b2011-02-07 10:33:21 +00002973Value *ScalarExprEmitter::VisitBlockExpr(const BlockExpr *block) {
2974 return CGF.EmitBlockLiteral(block);
Mike Stumpdf6b68c2009-02-12 18:29:15 +00002975}
2976
Tanya Lattner61eee0c2011-06-04 00:47:47 +00002977Value *ScalarExprEmitter::VisitAsTypeExpr(AsTypeExpr *E) {
2978 Value *Src = CGF.EmitScalarExpr(E->getSrcExpr());
Chris Lattner2acc6e32011-07-18 04:24:23 +00002979 llvm::Type *DstTy = ConvertType(E->getType());
Tanya Lattner61eee0c2011-06-04 00:47:47 +00002980
2981 // Going from vec4->vec3 or vec3->vec4 is a special case and requires
2982 // a shuffle vector instead of a bitcast.
Chris Lattner2acc6e32011-07-18 04:24:23 +00002983 llvm::Type *SrcTy = Src->getType();
Tanya Lattner61eee0c2011-06-04 00:47:47 +00002984 if (isa<llvm::VectorType>(DstTy) && isa<llvm::VectorType>(SrcTy)) {
2985 unsigned numElementsDst = cast<llvm::VectorType>(DstTy)->getNumElements();
2986 unsigned numElementsSrc = cast<llvm::VectorType>(SrcTy)->getNumElements();
2987 if ((numElementsDst == 3 && numElementsSrc == 4)
2988 || (numElementsDst == 4 && numElementsSrc == 3)) {
2989
2990
2991 // In the case of going from int4->float3, a bitcast is needed before
2992 // doing a shuffle.
Chris Lattner2acc6e32011-07-18 04:24:23 +00002993 llvm::Type *srcElemTy =
Tanya Lattner61eee0c2011-06-04 00:47:47 +00002994 cast<llvm::VectorType>(SrcTy)->getElementType();
Chris Lattner2acc6e32011-07-18 04:24:23 +00002995 llvm::Type *dstElemTy =
Tanya Lattner61eee0c2011-06-04 00:47:47 +00002996 cast<llvm::VectorType>(DstTy)->getElementType();
2997
2998 if ((srcElemTy->isIntegerTy() && dstElemTy->isFloatTy())
2999 || (srcElemTy->isFloatTy() && dstElemTy->isIntegerTy())) {
3000 // Create a float type of the same size as the source or destination.
Chris Lattner2acc6e32011-07-18 04:24:23 +00003001 llvm::VectorType *newSrcTy = llvm::VectorType::get(dstElemTy,
Tanya Lattner61eee0c2011-06-04 00:47:47 +00003002 numElementsSrc);
3003
3004 Src = Builder.CreateBitCast(Src, newSrcTy, "astypeCast");
3005 }
3006
3007 llvm::Value *UnV = llvm::UndefValue::get(Src->getType());
3008
Chris Lattner5f9e2722011-07-23 10:55:15 +00003009 SmallVector<llvm::Constant*, 3> Args;
Tanya Lattner61eee0c2011-06-04 00:47:47 +00003010 Args.push_back(Builder.getInt32(0));
3011 Args.push_back(Builder.getInt32(1));
3012 Args.push_back(Builder.getInt32(2));
3013
3014 if (numElementsDst == 4)
Chris Lattner8b418682012-02-07 00:39:47 +00003015 Args.push_back(llvm::UndefValue::get(CGF.Int32Ty));
Tanya Lattner61eee0c2011-06-04 00:47:47 +00003016
3017 llvm::Constant *Mask = llvm::ConstantVector::get(Args);
3018
3019 return Builder.CreateShuffleVector(Src, UnV, Mask, "astype");
3020 }
3021 }
3022
3023 return Builder.CreateBitCast(Src, DstTy, "astype");
3024}
3025
Eli Friedman276b0612011-10-11 02:20:01 +00003026Value *ScalarExprEmitter::VisitAtomicExpr(AtomicExpr *E) {
3027 return CGF.EmitAtomicExpr(E).getScalarVal();
3028}
3029
Chris Lattner7f02f722007-08-24 05:35:26 +00003030//===----------------------------------------------------------------------===//
3031// Entry Point into this File
3032//===----------------------------------------------------------------------===//
3033
Mike Stumpdb52dcd2009-09-09 13:00:44 +00003034/// EmitScalarExpr - Emit the computation of the specified expression of scalar
3035/// type, ignoring the result.
Mike Stump7f79f9b2009-05-29 15:46:01 +00003036Value *CodeGenFunction::EmitScalarExpr(const Expr *E, bool IgnoreResultAssign) {
Chris Lattner7f02f722007-08-24 05:35:26 +00003037 assert(E && !hasAggregateLLVMType(E->getType()) &&
3038 "Invalid scalar expression to emit");
Mike Stumpdb52dcd2009-09-09 13:00:44 +00003039
Devang Patel5de7a0e2011-03-07 18:29:53 +00003040 if (isa<CXXDefaultArgExpr>(E))
Devang Patelaa112892011-03-07 18:45:56 +00003041 disableDebugInfo();
Devang Patel5de7a0e2011-03-07 18:29:53 +00003042 Value *V = ScalarExprEmitter(*this, IgnoreResultAssign)
Mike Stump7f79f9b2009-05-29 15:46:01 +00003043 .Visit(const_cast<Expr*>(E));
Devang Patel5de7a0e2011-03-07 18:29:53 +00003044 if (isa<CXXDefaultArgExpr>(E))
Devang Patelaa112892011-03-07 18:45:56 +00003045 enableDebugInfo();
Devang Patel5de7a0e2011-03-07 18:29:53 +00003046 return V;
Chris Lattner7f02f722007-08-24 05:35:26 +00003047}
Chris Lattner3707b252007-08-26 06:48:56 +00003048
3049/// EmitScalarConversion - Emit a conversion from the specified type to the
3050/// specified destination type, both of which are LLVM scalar types.
Chris Lattner4f1a7b32007-08-26 16:34:22 +00003051Value *CodeGenFunction::EmitScalarConversion(Value *Src, QualType SrcTy,
3052 QualType DstTy) {
Chris Lattner3707b252007-08-26 06:48:56 +00003053 assert(!hasAggregateLLVMType(SrcTy) && !hasAggregateLLVMType(DstTy) &&
3054 "Invalid scalar expression to emit");
3055 return ScalarExprEmitter(*this).EmitScalarConversion(Src, SrcTy, DstTy);
3056}
Chris Lattner4f1a7b32007-08-26 16:34:22 +00003057
Mike Stumpdb52dcd2009-09-09 13:00:44 +00003058/// EmitComplexToScalarConversion - Emit a conversion from the specified complex
3059/// type to the specified destination type, where the destination type is an
3060/// LLVM scalar type.
Chris Lattner4f1a7b32007-08-26 16:34:22 +00003061Value *CodeGenFunction::EmitComplexToScalarConversion(ComplexPairTy Src,
3062 QualType SrcTy,
3063 QualType DstTy) {
Chris Lattner9b2dc282008-04-04 16:54:41 +00003064 assert(SrcTy->isAnyComplexType() && !hasAggregateLLVMType(DstTy) &&
Chris Lattner4f1a7b32007-08-26 16:34:22 +00003065 "Invalid complex -> scalar conversion");
3066 return ScalarExprEmitter(*this).EmitComplexToScalarConversion(Src, SrcTy,
3067 DstTy);
3068}
Anders Carlssoncc23aca2007-12-10 19:35:18 +00003069
Chris Lattner8c11a652010-06-26 22:09:34 +00003070
3071llvm::Value *CodeGenFunction::
3072EmitScalarPrePostIncDec(const UnaryOperator *E, LValue LV,
3073 bool isInc, bool isPre) {
3074 return ScalarExprEmitter(*this).EmitScalarPrePostIncDec(E, LV, isInc, isPre);
3075}
3076
Fariborz Jahanian820bca42009-12-09 23:35:29 +00003077LValue CodeGenFunction::EmitObjCIsaExpr(const ObjCIsaExpr *E) {
3078 llvm::Value *V;
3079 // object->isa or (*object).isa
3080 // Generate code as for: *(Class*)object
Fariborz Jahanian820bca42009-12-09 23:35:29 +00003081 // build Class* type
Chris Lattner2acc6e32011-07-18 04:24:23 +00003082 llvm::Type *ClassPtrTy = ConvertType(E->getType());
Fariborz Jahanian5ed676c2010-02-05 19:18:30 +00003083
3084 Expr *BaseExpr = E->getBase();
John McCall7eb0a9e2010-11-24 05:12:34 +00003085 if (BaseExpr->isRValue()) {
Eli Friedmand71f4422011-12-19 23:03:09 +00003086 V = CreateMemTemp(E->getType(), "resval");
Fariborz Jahanian5ed676c2010-02-05 19:18:30 +00003087 llvm::Value *Src = EmitScalarExpr(BaseExpr);
3088 Builder.CreateStore(Src, V);
Daniel Dunbar9f553f52010-08-21 03:08:16 +00003089 V = ScalarExprEmitter(*this).EmitLoadOfLValue(
Eli Friedmand71f4422011-12-19 23:03:09 +00003090 MakeNaturalAlignAddrLValue(V, E->getType()));
Daniel Dunbar9f553f52010-08-21 03:08:16 +00003091 } else {
3092 if (E->isArrow())
3093 V = ScalarExprEmitter(*this).EmitLoadOfLValue(BaseExpr);
3094 else
3095 V = EmitLValue(BaseExpr).getAddress();
Fariborz Jahanian5ed676c2010-02-05 19:18:30 +00003096 }
3097
3098 // build Class* type
Fariborz Jahanian820bca42009-12-09 23:35:29 +00003099 ClassPtrTy = ClassPtrTy->getPointerTo();
3100 V = Builder.CreateBitCast(V, ClassPtrTy);
Eli Friedmand71f4422011-12-19 23:03:09 +00003101 return MakeNaturalAlignAddrLValue(V, E->getType());
Fariborz Jahanian820bca42009-12-09 23:35:29 +00003102}
3103
Douglas Gregor6a03e342010-04-23 04:16:32 +00003104
John McCall2a416372010-12-05 02:00:02 +00003105LValue CodeGenFunction::EmitCompoundAssignmentLValue(
Douglas Gregor6a03e342010-04-23 04:16:32 +00003106 const CompoundAssignOperator *E) {
3107 ScalarExprEmitter Scalar(*this);
Daniel Dunbard7f7d082010-06-29 22:00:45 +00003108 Value *Result = 0;
Douglas Gregor6a03e342010-04-23 04:16:32 +00003109 switch (E->getOpcode()) {
3110#define COMPOUND_OP(Op) \
John McCall2de56d12010-08-25 11:45:40 +00003111 case BO_##Op##Assign: \
Douglas Gregor6a03e342010-04-23 04:16:32 +00003112 return Scalar.EmitCompoundAssignLValue(E, &ScalarExprEmitter::Emit##Op, \
Daniel Dunbard7f7d082010-06-29 22:00:45 +00003113 Result)
Douglas Gregor6a03e342010-04-23 04:16:32 +00003114 COMPOUND_OP(Mul);
3115 COMPOUND_OP(Div);
3116 COMPOUND_OP(Rem);
3117 COMPOUND_OP(Add);
3118 COMPOUND_OP(Sub);
3119 COMPOUND_OP(Shl);
3120 COMPOUND_OP(Shr);
3121 COMPOUND_OP(And);
3122 COMPOUND_OP(Xor);
3123 COMPOUND_OP(Or);
3124#undef COMPOUND_OP
3125
John McCall2de56d12010-08-25 11:45:40 +00003126 case BO_PtrMemD:
3127 case BO_PtrMemI:
3128 case BO_Mul:
3129 case BO_Div:
3130 case BO_Rem:
3131 case BO_Add:
3132 case BO_Sub:
3133 case BO_Shl:
3134 case BO_Shr:
3135 case BO_LT:
3136 case BO_GT:
3137 case BO_LE:
3138 case BO_GE:
3139 case BO_EQ:
3140 case BO_NE:
3141 case BO_And:
3142 case BO_Xor:
3143 case BO_Or:
3144 case BO_LAnd:
3145 case BO_LOr:
3146 case BO_Assign:
3147 case BO_Comma:
David Blaikieb219cfc2011-09-23 05:06:16 +00003148 llvm_unreachable("Not valid compound assignment operators");
Douglas Gregor6a03e342010-04-23 04:16:32 +00003149 }
3150
3151 llvm_unreachable("Unhandled compound assignment operator");
3152}