blob: f6f126a8a621c9c89b6a335e6cd2069c306a982a [file] [log] [blame]
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"
Fariborz Jahanianf7bcc7e2009-10-10 20:07:56 +000015#include "CGObjCRuntime.h"
Chris Lattner7f02f722007-08-24 05:35:26 +000016#include "CodeGenModule.h"
Daniel Dunbarde7fb842008-08-11 05:00:27 +000017#include "clang/AST/ASTContext.h"
Daniel Dunbar98c5ead2008-08-12 05:08:18 +000018#include "clang/AST/DeclObjC.h"
Anders Carlsson19cc4ab2009-07-18 19:43:29 +000019#include "clang/AST/RecordLayout.h"
Daniel Dunbarde7fb842008-08-11 05:00:27 +000020#include "clang/AST/StmtVisitor.h"
Chris Lattner25ddea72008-04-20 00:50:39 +000021#include "clang/Basic/TargetInfo.h"
Chris Lattner7f02f722007-08-24 05:35:26 +000022#include "llvm/Constants.h"
23#include "llvm/Function.h"
Anders Carlsson85f9bce2007-10-29 05:01:08 +000024#include "llvm/GlobalVariable.h"
Anders Carlsson7c50aca2007-10-15 20:28:48 +000025#include "llvm/Intrinsics.h"
Mike Stump2add4732009-04-01 20:28:16 +000026#include "llvm/Module.h"
Chris Lattnerf7b5ea92008-11-12 08:38:24 +000027#include "llvm/Support/CFG.h"
Mike Stump4e7a1f72009-02-21 20:00:35 +000028#include "llvm/Target/TargetData.h"
Chris Lattnerc89bf692008-01-03 07:05:49 +000029#include <cstdarg>
Ted Kremenek6aad91a2007-12-10 23:44:32 +000030
Chris Lattner7f02f722007-08-24 05:35:26 +000031using namespace clang;
32using namespace CodeGen;
33using llvm::Value;
34
35//===----------------------------------------------------------------------===//
36// Scalar Expression Emitter
37//===----------------------------------------------------------------------===//
38
39struct BinOpInfo {
40 Value *LHS;
41 Value *RHS;
Chris Lattner1f1ded92007-08-24 21:00:35 +000042 QualType Ty; // Computation Type.
Chris Lattner9a207232010-06-26 21:48:21 +000043 BinaryOperator::Opcode Opcode; // Opcode of BinOp to perform
44 const Expr *E; // Entire expr, for error unsupported. May not be binop.
Chris Lattner7f02f722007-08-24 05:35:26 +000045};
46
47namespace {
Benjamin Kramer85b45212009-11-28 19:45:26 +000048class ScalarExprEmitter
Chris Lattner7f02f722007-08-24 05:35:26 +000049 : public StmtVisitor<ScalarExprEmitter, Value*> {
50 CodeGenFunction &CGF;
Daniel Dunbar45d196b2008-11-01 01:53:16 +000051 CGBuilderTy &Builder;
Mike Stump7f79f9b2009-05-29 15:46:01 +000052 bool IgnoreResultAssign;
Owen Andersona1cf15f2009-07-14 23:10:40 +000053 llvm::LLVMContext &VMContext;
Chris Lattner7f02f722007-08-24 05:35:26 +000054public:
55
Mike Stump7f79f9b2009-05-29 15:46:01 +000056 ScalarExprEmitter(CodeGenFunction &cgf, bool ira=false)
Mike Stumpdb52dcd2009-09-09 13:00:44 +000057 : CGF(cgf), Builder(CGF.Builder), IgnoreResultAssign(ira),
Owen Andersona1cf15f2009-07-14 23:10:40 +000058 VMContext(cgf.getLLVMContext()) {
Chris Lattner7f02f722007-08-24 05:35:26 +000059 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +000060
Chris Lattner7f02f722007-08-24 05:35:26 +000061 //===--------------------------------------------------------------------===//
62 // Utilities
63 //===--------------------------------------------------------------------===//
64
Mike Stump7f79f9b2009-05-29 15:46:01 +000065 bool TestAndClearIgnoreResultAssign() {
Chris Lattner9c10fcf2009-07-08 01:08:03 +000066 bool I = IgnoreResultAssign;
67 IgnoreResultAssign = false;
68 return I;
69 }
Mike Stump7f79f9b2009-05-29 15:46:01 +000070
Chris Lattner7f02f722007-08-24 05:35:26 +000071 const llvm::Type *ConvertType(QualType T) { return CGF.ConvertType(T); }
72 LValue EmitLValue(const Expr *E) { return CGF.EmitLValue(E); }
Mike Stumpb14e62d2009-12-16 02:57:00 +000073 LValue EmitCheckedLValue(const Expr *E) { return CGF.EmitCheckedLValue(E); }
Chris Lattner7f02f722007-08-24 05:35:26 +000074
75 Value *EmitLoadOfLValue(LValue LV, QualType T) {
Chris Lattner9b655512007-08-31 22:49:20 +000076 return CGF.EmitLoadOfLValue(LV, T).getScalarVal();
Chris Lattner7f02f722007-08-24 05:35:26 +000077 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +000078
Chris Lattner7f02f722007-08-24 05:35:26 +000079 /// EmitLoadOfLValue - Given an expression with complex type that represents a
80 /// value l-value, this method emits the address of the l-value, then loads
81 /// and returns the result.
82 Value *EmitLoadOfLValue(const Expr *E) {
Mike Stumpb14e62d2009-12-16 02:57:00 +000083 return EmitLoadOfLValue(EmitCheckedLValue(E), E->getType());
Chris Lattner7f02f722007-08-24 05:35:26 +000084 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +000085
Chris Lattner9abc84e2007-08-26 16:42:57 +000086 /// EmitConversionToBool - Convert the specified expression value to a
Chris Lattner3420d0d2007-08-26 17:25:57 +000087 /// boolean (i1) truth value. This is equivalent to "Val != 0".
Chris Lattner9abc84e2007-08-26 16:42:57 +000088 Value *EmitConversionToBool(Value *Src, QualType DstTy);
Mike Stumpdb52dcd2009-09-09 13:00:44 +000089
Chris Lattner3707b252007-08-26 06:48:56 +000090 /// EmitScalarConversion - Emit a conversion from the specified type to the
91 /// specified destination type, both of which are LLVM scalar types.
Chris Lattner4f1a7b32007-08-26 16:34:22 +000092 Value *EmitScalarConversion(Value *Src, QualType SrcTy, QualType DstTy);
93
94 /// EmitComplexToScalarConversion - Emit a conversion from the specified
Mike Stumpdb52dcd2009-09-09 13:00:44 +000095 /// complex type to the specified destination type, where the destination type
96 /// is an LLVM scalar type.
Chris Lattner4f1a7b32007-08-26 16:34:22 +000097 Value *EmitComplexToScalarConversion(CodeGenFunction::ComplexPairTy Src,
98 QualType SrcTy, QualType DstTy);
Mike Stumpdf6b68c2009-02-12 18:29:15 +000099
Anders Carlssona40a9f32010-05-22 17:45:10 +0000100 /// EmitNullValue - Emit a value that corresponds to null for the given type.
101 Value *EmitNullValue(QualType Ty);
102
Chris Lattner7f02f722007-08-24 05:35:26 +0000103 //===--------------------------------------------------------------------===//
104 // Visitor Methods
105 //===--------------------------------------------------------------------===//
106
107 Value *VisitStmt(Stmt *S) {
Ted Kremenek7a9d49f2007-12-11 21:27:55 +0000108 S->dump(CGF.getContext().getSourceManager());
Chris Lattner7f02f722007-08-24 05:35:26 +0000109 assert(0 && "Stmt can't have complex result type!");
110 return 0;
111 }
112 Value *VisitExpr(Expr *S);
Fariborz Jahanianf51dc642009-10-21 23:45:42 +0000113
Chris Lattner7f02f722007-08-24 05:35:26 +0000114 Value *VisitParenExpr(ParenExpr *PE) { return Visit(PE->getSubExpr()); }
115
116 // Leaves.
117 Value *VisitIntegerLiteral(const IntegerLiteral *E) {
Owen Anderson4a28d5d2009-07-24 23:12:58 +0000118 return llvm::ConstantInt::get(VMContext, E->getValue());
Chris Lattner7f02f722007-08-24 05:35:26 +0000119 }
120 Value *VisitFloatingLiteral(const FloatingLiteral *E) {
Owen Andersonbc0a2222009-07-27 21:00:51 +0000121 return llvm::ConstantFP::get(VMContext, E->getValue());
Chris Lattner7f02f722007-08-24 05:35:26 +0000122 }
123 Value *VisitCharacterLiteral(const CharacterLiteral *E) {
Owen Anderson4a28d5d2009-07-24 23:12:58 +0000124 return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue());
Chris Lattner7f02f722007-08-24 05:35:26 +0000125 }
Nate Begemane7579b52007-11-15 05:40:03 +0000126 Value *VisitCXXBoolLiteralExpr(const CXXBoolLiteralExpr *E) {
Owen Anderson4a28d5d2009-07-24 23:12:58 +0000127 return llvm::ConstantInt::get(ConvertType(E->getType()), E->getValue());
Nate Begemane7579b52007-11-15 05:40:03 +0000128 }
Douglas Gregored8abf12010-07-08 06:14:04 +0000129 Value *VisitCXXScalarValueInitExpr(const CXXScalarValueInitExpr *E) {
Anders Carlssona40a9f32010-05-22 17:45:10 +0000130 return EmitNullValue(E->getType());
Argyrios Kyrtzidis7267f782008-08-23 19:35:47 +0000131 }
Anders Carlsson3f704562008-12-21 22:39:40 +0000132 Value *VisitGNUNullExpr(const GNUNullExpr *E) {
Anders Carlssona40a9f32010-05-22 17:45:10 +0000133 return EmitNullValue(E->getType());
Anders Carlsson3f704562008-12-21 22:39:40 +0000134 }
Chris Lattner7f02f722007-08-24 05:35:26 +0000135 Value *VisitTypesCompatibleExpr(const TypesCompatibleExpr *E) {
Owen Anderson4a28d5d2009-07-24 23:12:58 +0000136 return llvm::ConstantInt::get(ConvertType(E->getType()),
Steve Naroffec0550f2007-10-15 20:41:53 +0000137 CGF.getContext().typesAreCompatible(
138 E->getArgType1(), E->getArgType2()));
Chris Lattner7f02f722007-08-24 05:35:26 +0000139 }
Eli Friedman0027d2b2010-08-05 09:58:49 +0000140 Value *VisitOffsetOfExpr(OffsetOfExpr *E);
Sebastian Redl05189992008-11-11 17:56:53 +0000141 Value *VisitSizeOfAlignOfExpr(const SizeOfAlignOfExpr *E);
Daniel Dunbar0ffb1252008-08-04 16:51:22 +0000142 Value *VisitAddrLabelExpr(const AddrLabelExpr *E) {
Chris Lattnerd9becd12009-10-28 23:59:40 +0000143 llvm::Value *V = CGF.GetAddrOfLabel(E->getLabel());
144 return Builder.CreateBitCast(V, ConvertType(E->getType()));
Daniel Dunbar0ffb1252008-08-04 16:51:22 +0000145 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000146
Chris Lattner7f02f722007-08-24 05:35:26 +0000147 // l-values.
148 Value *VisitDeclRefExpr(DeclRefExpr *E) {
Eli Friedman28665272009-11-26 03:22:21 +0000149 Expr::EvalResult Result;
150 if (E->Evaluate(Result, CGF.getContext()) && Result.Val.isInt()) {
151 assert(!Result.HasSideEffects && "Constant declref with side-effect?!");
Devang Patel8d308382010-08-10 07:24:25 +0000152 CGF.EmitDeclRefExprDbgValue(E, Result.Val);
Eli Friedman28665272009-11-26 03:22:21 +0000153 return llvm::ConstantInt::get(VMContext, Result.Val.getInt());
154 }
Chris Lattner7f02f722007-08-24 05:35:26 +0000155 return EmitLoadOfLValue(E);
156 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000157 Value *VisitObjCSelectorExpr(ObjCSelectorExpr *E) {
158 return CGF.EmitObjCSelectorExpr(E);
Daniel Dunbar9c3fc702008-08-27 06:57:25 +0000159 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000160 Value *VisitObjCProtocolExpr(ObjCProtocolExpr *E) {
161 return CGF.EmitObjCProtocolExpr(E);
Daniel Dunbar9c3fc702008-08-27 06:57:25 +0000162 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000163 Value *VisitObjCIvarRefExpr(ObjCIvarRefExpr *E) {
Daniel Dunbar9c3fc702008-08-27 06:57:25 +0000164 return EmitLoadOfLValue(E);
165 }
Daniel Dunbar0a04d772008-08-23 10:51:21 +0000166 Value *VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *E) {
Daniel Dunbar85c59ed2008-08-29 08:11:39 +0000167 return EmitLoadOfLValue(E);
Daniel Dunbar9c3fc702008-08-27 06:57:25 +0000168 }
Fariborz Jahanian09105f52009-08-20 17:02:02 +0000169 Value *VisitObjCImplicitSetterGetterRefExpr(
170 ObjCImplicitSetterGetterRefExpr *E) {
Fariborz Jahanian43f44702008-11-22 22:30:21 +0000171 return EmitLoadOfLValue(E);
172 }
Daniel Dunbar9c3fc702008-08-27 06:57:25 +0000173 Value *VisitObjCMessageExpr(ObjCMessageExpr *E) {
174 return CGF.EmitObjCMessageExpr(E).getScalarVal();
Daniel Dunbar0a04d772008-08-23 10:51:21 +0000175 }
176
Fariborz Jahanian83dc3252009-12-09 19:05:56 +0000177 Value *VisitObjCIsaExpr(ObjCIsaExpr *E) {
Fariborz Jahanian820bca42009-12-09 23:35:29 +0000178 LValue LV = CGF.EmitObjCIsaExpr(E);
179 Value *V = CGF.EmitLoadOfLValue(LV, E->getType()).getScalarVal();
Fariborz Jahanian83dc3252009-12-09 19:05:56 +0000180 return V;
181 }
182
Chris Lattner7f02f722007-08-24 05:35:26 +0000183 Value *VisitArraySubscriptExpr(ArraySubscriptExpr *E);
Eli Friedmand38617c2008-05-14 19:38:39 +0000184 Value *VisitShuffleVectorExpr(ShuffleVectorExpr *E);
Eli Friedman28665272009-11-26 03:22:21 +0000185 Value *VisitMemberExpr(MemberExpr *E);
Nate Begeman213541a2008-04-18 23:10:10 +0000186 Value *VisitExtVectorElementExpr(Expr *E) { return EmitLoadOfLValue(E); }
Chris Lattnerbe20bb52008-10-26 23:53:12 +0000187 Value *VisitCompoundLiteralExpr(CompoundLiteralExpr *E) {
188 return EmitLoadOfLValue(E);
189 }
Devang Patel35634f52007-10-24 17:18:43 +0000190
Nate Begeman0533b302009-10-18 20:10:40 +0000191 Value *VisitInitListExpr(InitListExpr *E);
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000192
Douglas Gregor3498bdb2009-01-29 17:44:32 +0000193 Value *VisitImplicitValueInitExpr(const ImplicitValueInitExpr *E) {
Anders Carlsson3cb18bc2010-05-14 15:05:19 +0000194 return CGF.CGM.EmitNullConstant(E->getType());
Douglas Gregor3498bdb2009-01-29 17:44:32 +0000195 }
Eli Friedmand8889622009-11-27 04:41:50 +0000196 Value *VisitCastExpr(CastExpr *E) {
Eli Friedmanc62aad82009-04-20 03:54:15 +0000197 // Make sure to evaluate VLA bounds now so that we have them for later.
198 if (E->getType()->isVariablyModifiedType())
199 CGF.EmitVLASize(E->getType());
200
Anders Carlsson592a2bb2009-09-22 22:00:46 +0000201 return EmitCastExpr(E);
Chris Lattner7f02f722007-08-24 05:35:26 +0000202 }
Eli Friedmand8889622009-11-27 04:41:50 +0000203 Value *EmitCastExpr(CastExpr *E);
Chris Lattner7f02f722007-08-24 05:35:26 +0000204
205 Value *VisitCallExpr(const CallExpr *E) {
Anders Carlssone9f2f452009-05-27 03:37:57 +0000206 if (E->getCallReturnType()->isReferenceType())
207 return EmitLoadOfLValue(E);
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000208
Chris Lattner9b655512007-08-31 22:49:20 +0000209 return CGF.EmitCallExpr(E).getScalarVal();
Chris Lattner7f02f722007-08-24 05:35:26 +0000210 }
Daniel Dunbar8f2926b2008-08-23 03:46:30 +0000211
Chris Lattner33793202007-08-31 22:09:40 +0000212 Value *VisitStmtExpr(const StmtExpr *E);
Mike Stump4e7a1f72009-02-21 20:00:35 +0000213
Mike Stumpa99038c2009-02-28 09:07:16 +0000214 Value *VisitBlockDeclRefExpr(const BlockDeclRefExpr *E);
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000215
Chris Lattner7f02f722007-08-24 05:35:26 +0000216 // Unary Operators.
Chris Lattner7f02f722007-08-24 05:35:26 +0000217 Value *VisitUnaryPostDec(const UnaryOperator *E) {
Chris Lattner8c11a652010-06-26 22:09:34 +0000218 LValue LV = EmitLValue(E->getSubExpr());
219 return EmitScalarPrePostIncDec(E, LV, false, false);
Chris Lattner7f02f722007-08-24 05:35:26 +0000220 }
221 Value *VisitUnaryPostInc(const UnaryOperator *E) {
Chris Lattner8c11a652010-06-26 22:09:34 +0000222 LValue LV = EmitLValue(E->getSubExpr());
223 return EmitScalarPrePostIncDec(E, LV, true, false);
Chris Lattner7f02f722007-08-24 05:35:26 +0000224 }
225 Value *VisitUnaryPreDec(const UnaryOperator *E) {
Chris Lattner8c11a652010-06-26 22:09:34 +0000226 LValue LV = EmitLValue(E->getSubExpr());
227 return EmitScalarPrePostIncDec(E, LV, false, true);
Chris Lattner7f02f722007-08-24 05:35:26 +0000228 }
229 Value *VisitUnaryPreInc(const UnaryOperator *E) {
Chris Lattner8c11a652010-06-26 22:09:34 +0000230 LValue LV = EmitLValue(E->getSubExpr());
231 return EmitScalarPrePostIncDec(E, LV, true, true);
Chris Lattner7f02f722007-08-24 05:35:26 +0000232 }
Chris Lattner8c11a652010-06-26 22:09:34 +0000233
234 llvm::Value *EmitScalarPrePostIncDec(const UnaryOperator *E, LValue LV,
235 bool isInc, bool isPre);
236
237
Chris Lattner7f02f722007-08-24 05:35:26 +0000238 Value *VisitUnaryAddrOf(const UnaryOperator *E) {
239 return EmitLValue(E->getSubExpr()).getAddress();
240 }
241 Value *VisitUnaryDeref(const Expr *E) { return EmitLoadOfLValue(E); }
242 Value *VisitUnaryPlus(const UnaryOperator *E) {
Mike Stump7f79f9b2009-05-29 15:46:01 +0000243 // This differs from gcc, though, most likely due to a bug in gcc.
244 TestAndClearIgnoreResultAssign();
Chris Lattner7f02f722007-08-24 05:35:26 +0000245 return Visit(E->getSubExpr());
246 }
247 Value *VisitUnaryMinus (const UnaryOperator *E);
248 Value *VisitUnaryNot (const UnaryOperator *E);
249 Value *VisitUnaryLNot (const UnaryOperator *E);
Chris Lattner46f93d02007-08-24 21:20:17 +0000250 Value *VisitUnaryReal (const UnaryOperator *E);
251 Value *VisitUnaryImag (const UnaryOperator *E);
Chris Lattner7f02f722007-08-24 05:35:26 +0000252 Value *VisitUnaryExtension(const UnaryOperator *E) {
253 return Visit(E->getSubExpr());
254 }
Anders Carlsson5a1deb82008-01-29 15:56:48 +0000255 Value *VisitUnaryOffsetOf(const UnaryOperator *E);
Douglas Gregor8ecdb652010-04-28 22:16:22 +0000256
Anders Carlsson5f4307b2009-04-14 16:58:56 +0000257 // C++
Chris Lattner04421082008-04-08 04:40:51 +0000258 Value *VisitCXXDefaultArgExpr(CXXDefaultArgExpr *DAE) {
259 return Visit(DAE->getExpr());
260 }
Anders Carlsson5f4307b2009-04-14 16:58:56 +0000261 Value *VisitCXXThisExpr(CXXThisExpr *TE) {
262 return CGF.LoadCXXThis();
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000263 }
264
Anders Carlsson7f6ad152009-05-19 04:48:36 +0000265 Value *VisitCXXExprWithTemporaries(CXXExprWithTemporaries *E) {
Anders Carlsson30824632009-05-31 00:09:15 +0000266 return CGF.EmitCXXExprWithTemporaries(E).getScalarVal();
Anders Carlsson7f6ad152009-05-19 04:48:36 +0000267 }
Anders Carlssona00703d2009-05-31 01:40:14 +0000268 Value *VisitCXXNewExpr(const CXXNewExpr *E) {
269 return CGF.EmitCXXNewExpr(E);
270 }
Anders Carlsson60e282c2009-08-16 21:13:42 +0000271 Value *VisitCXXDeleteExpr(const CXXDeleteExpr *E) {
272 CGF.EmitCXXDeleteExpr(E);
273 return 0;
274 }
Eli Friedman9dfebdc2009-12-10 22:40:32 +0000275 Value *VisitUnaryTypeTraitExpr(const UnaryTypeTraitExpr *E) {
276 return llvm::ConstantInt::get(Builder.getInt1Ty(),
277 E->EvaluateTrait(CGF.getContext()));
278 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000279
Douglas Gregora71d8192009-09-04 17:36:40 +0000280 Value *VisitCXXPseudoDestructorExpr(const CXXPseudoDestructorExpr *E) {
281 // C++ [expr.pseudo]p1:
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000282 // The result shall only be used as the operand for the function call
Douglas Gregora71d8192009-09-04 17:36:40 +0000283 // operator (), and the result of such a call has type void. The only
284 // effect is the evaluation of the postfix-expression before the dot or
285 // arrow.
286 CGF.EmitScalarExpr(E->getBase());
287 return 0;
288 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000289
Anders Carlssonc1eb14a2009-09-15 04:39:46 +0000290 Value *VisitCXXNullPtrLiteralExpr(const CXXNullPtrLiteralExpr *E) {
Anders Carlssona40a9f32010-05-22 17:45:10 +0000291 return EmitNullValue(E->getType());
Anders Carlssonc1eb14a2009-09-15 04:39:46 +0000292 }
Anders Carlsson756b5c42009-10-30 01:42:31 +0000293
294 Value *VisitCXXThrowExpr(const CXXThrowExpr *E) {
295 CGF.EmitCXXThrowExpr(E);
296 return 0;
297 }
298
Chris Lattner7f02f722007-08-24 05:35:26 +0000299 // Binary Operators.
Chris Lattner7f02f722007-08-24 05:35:26 +0000300 Value *EmitMul(const BinOpInfo &Ops) {
Douglas Gregorf6094622010-07-23 15:58:24 +0000301 if (Ops.Ty->hasSignedIntegerRepresentation()) {
Chris Lattnera4d71452010-06-26 21:25:03 +0000302 switch (CGF.getContext().getLangOptions().getSignedOverflowBehavior()) {
303 case LangOptions::SOB_Undefined:
304 return Builder.CreateNSWMul(Ops.LHS, Ops.RHS, "mul");
305 case LangOptions::SOB_Defined:
306 return Builder.CreateMul(Ops.LHS, Ops.RHS, "mul");
307 case LangOptions::SOB_Trapping:
308 return EmitOverflowCheckedBinOp(Ops);
309 }
310 }
311
Duncan Sandsf177d9d2010-02-15 16:14:01 +0000312 if (Ops.LHS->getType()->isFPOrFPVectorTy())
Chris Lattner87415d22009-06-17 06:36:24 +0000313 return Builder.CreateFMul(Ops.LHS, Ops.RHS, "mul");
Chris Lattner7f02f722007-08-24 05:35:26 +0000314 return Builder.CreateMul(Ops.LHS, Ops.RHS, "mul");
315 }
Mike Stump2add4732009-04-01 20:28:16 +0000316 /// Create a binary op that checks for overflow.
317 /// Currently only supports +, - and *.
318 Value *EmitOverflowCheckedBinOp(const BinOpInfo &Ops);
Chris Lattner7f02f722007-08-24 05:35:26 +0000319 Value *EmitDiv(const BinOpInfo &Ops);
320 Value *EmitRem(const BinOpInfo &Ops);
321 Value *EmitAdd(const BinOpInfo &Ops);
322 Value *EmitSub(const BinOpInfo &Ops);
323 Value *EmitShl(const BinOpInfo &Ops);
324 Value *EmitShr(const BinOpInfo &Ops);
325 Value *EmitAnd(const BinOpInfo &Ops) {
326 return Builder.CreateAnd(Ops.LHS, Ops.RHS, "and");
327 }
328 Value *EmitXor(const BinOpInfo &Ops) {
329 return Builder.CreateXor(Ops.LHS, Ops.RHS, "xor");
330 }
331 Value *EmitOr (const BinOpInfo &Ops) {
332 return Builder.CreateOr(Ops.LHS, Ops.RHS, "or");
333 }
334
Chris Lattner1f1ded92007-08-24 21:00:35 +0000335 BinOpInfo EmitBinOps(const BinaryOperator *E);
Douglas Gregor6a03e342010-04-23 04:16:32 +0000336 LValue EmitCompoundAssignLValue(const CompoundAssignOperator *E,
337 Value *(ScalarExprEmitter::*F)(const BinOpInfo &),
Daniel Dunbard7f7d082010-06-29 22:00:45 +0000338 Value *&Result);
Douglas Gregor6a03e342010-04-23 04:16:32 +0000339
Chris Lattner3ccf7742007-08-26 21:41:21 +0000340 Value *EmitCompoundAssign(const CompoundAssignOperator *E,
Chris Lattner1f1ded92007-08-24 21:00:35 +0000341 Value *(ScalarExprEmitter::*F)(const BinOpInfo &));
342
343 // Binary operators and binary compound assignment operators.
344#define HANDLEBINOP(OP) \
Chris Lattner3ccf7742007-08-26 21:41:21 +0000345 Value *VisitBin ## OP(const BinaryOperator *E) { \
346 return Emit ## OP(EmitBinOps(E)); \
347 } \
348 Value *VisitBin ## OP ## Assign(const CompoundAssignOperator *E) { \
349 return EmitCompoundAssign(E, &ScalarExprEmitter::Emit ## OP); \
Chris Lattner1f1ded92007-08-24 21:00:35 +0000350 }
Daniel Dunbar7177dee2009-12-19 17:50:07 +0000351 HANDLEBINOP(Mul)
352 HANDLEBINOP(Div)
353 HANDLEBINOP(Rem)
354 HANDLEBINOP(Add)
355 HANDLEBINOP(Sub)
356 HANDLEBINOP(Shl)
357 HANDLEBINOP(Shr)
358 HANDLEBINOP(And)
359 HANDLEBINOP(Xor)
360 HANDLEBINOP(Or)
Chris Lattner1f1ded92007-08-24 21:00:35 +0000361#undef HANDLEBINOP
Daniel Dunbar8c6f57c2008-08-06 02:00:38 +0000362
Chris Lattner7f02f722007-08-24 05:35:26 +0000363 // Comparisons.
364 Value *EmitCompare(const BinaryOperator *E, unsigned UICmpOpc,
365 unsigned SICmpOpc, unsigned FCmpOpc);
366#define VISITCOMP(CODE, UI, SI, FP) \
367 Value *VisitBin##CODE(const BinaryOperator *E) { \
368 return EmitCompare(E, llvm::ICmpInst::UI, llvm::ICmpInst::SI, \
369 llvm::FCmpInst::FP); }
Daniel Dunbar7177dee2009-12-19 17:50:07 +0000370 VISITCOMP(LT, ICMP_ULT, ICMP_SLT, FCMP_OLT)
371 VISITCOMP(GT, ICMP_UGT, ICMP_SGT, FCMP_OGT)
372 VISITCOMP(LE, ICMP_ULE, ICMP_SLE, FCMP_OLE)
373 VISITCOMP(GE, ICMP_UGE, ICMP_SGE, FCMP_OGE)
374 VISITCOMP(EQ, ICMP_EQ , ICMP_EQ , FCMP_OEQ)
375 VISITCOMP(NE, ICMP_NE , ICMP_NE , FCMP_UNE)
Chris Lattner7f02f722007-08-24 05:35:26 +0000376#undef VISITCOMP
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000377
Chris Lattner7f02f722007-08-24 05:35:26 +0000378 Value *VisitBinAssign (const BinaryOperator *E);
379
380 Value *VisitBinLAnd (const BinaryOperator *E);
381 Value *VisitBinLOr (const BinaryOperator *E);
Chris Lattner7f02f722007-08-24 05:35:26 +0000382 Value *VisitBinComma (const BinaryOperator *E);
383
Eli Friedman25b825d2009-11-18 09:41:26 +0000384 Value *VisitBinPtrMemD(const Expr *E) { return EmitLoadOfLValue(E); }
385 Value *VisitBinPtrMemI(const Expr *E) { return EmitLoadOfLValue(E); }
386
Chris Lattner7f02f722007-08-24 05:35:26 +0000387 // Other Operators.
Mike Stumpdf6b68c2009-02-12 18:29:15 +0000388 Value *VisitBlockExpr(const BlockExpr *BE);
Chris Lattner7f02f722007-08-24 05:35:26 +0000389 Value *VisitConditionalOperator(const ConditionalOperator *CO);
390 Value *VisitChooseExpr(ChooseExpr *CE);
Anders Carlsson7c50aca2007-10-15 20:28:48 +0000391 Value *VisitVAArgExpr(VAArgExpr *VE);
Chris Lattner7f02f722007-08-24 05:35:26 +0000392 Value *VisitObjCStringLiteral(const ObjCStringLiteral *E) {
393 return CGF.EmitObjCStringLiteral(E);
394 }
395};
396} // end anonymous namespace.
397
398//===----------------------------------------------------------------------===//
399// Utilities
400//===----------------------------------------------------------------------===//
401
Chris Lattner9abc84e2007-08-26 16:42:57 +0000402/// EmitConversionToBool - Convert the specified expression value to a
Chris Lattner3420d0d2007-08-26 17:25:57 +0000403/// boolean (i1) truth value. This is equivalent to "Val != 0".
Chris Lattner9abc84e2007-08-26 16:42:57 +0000404Value *ScalarExprEmitter::EmitConversionToBool(Value *Src, QualType SrcType) {
John McCall467b27b2009-10-22 20:10:53 +0000405 assert(SrcType.isCanonical() && "EmitScalarConversion strips typedefs");
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000406
Chris Lattner9abc84e2007-08-26 16:42:57 +0000407 if (SrcType->isRealFloatingType()) {
408 // Compare against 0.0 for fp scalars.
Owen Andersonc9c88b42009-07-31 20:28:54 +0000409 llvm::Value *Zero = llvm::Constant::getNullValue(Src->getType());
Chris Lattner9abc84e2007-08-26 16:42:57 +0000410 return Builder.CreateFCmpUNE(Src, Zero, "tobool");
411 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000412
Anders Carlsson237957c2009-08-09 18:26:27 +0000413 if (SrcType->isMemberPointerType()) {
Anders Carlsson237957c2009-08-09 18:26:27 +0000414 // Compare against -1.
415 llvm::Value *NegativeOne = llvm::Constant::getAllOnesValue(Src->getType());
416 return Builder.CreateICmpNE(Src, NegativeOne, "tobool");
417 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000418
Daniel Dunbard1d66bc2008-08-25 10:38:11 +0000419 assert((SrcType->isIntegerType() || isa<llvm::PointerType>(Src->getType())) &&
Chris Lattner9abc84e2007-08-26 16:42:57 +0000420 "Unknown scalar type to convert");
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000421
Chris Lattner9abc84e2007-08-26 16:42:57 +0000422 // Because of the type rules of C, we often end up computing a logical value,
423 // then zero extending it to int, then wanting it as a logical value again.
424 // Optimize this common case.
425 if (llvm::ZExtInst *ZI = dyn_cast<llvm::ZExtInst>(Src)) {
Owen Anderson0032b272009-08-13 21:57:51 +0000426 if (ZI->getOperand(0)->getType() ==
427 llvm::Type::getInt1Ty(CGF.getLLVMContext())) {
Chris Lattner9abc84e2007-08-26 16:42:57 +0000428 Value *Result = ZI->getOperand(0);
Eli Friedman356916e2008-01-29 18:13:51 +0000429 // If there aren't any more uses, zap the instruction to save space.
430 // Note that there can be more uses, for example if this
431 // is the result of an assignment.
432 if (ZI->use_empty())
433 ZI->eraseFromParent();
Chris Lattner9abc84e2007-08-26 16:42:57 +0000434 return Result;
435 }
436 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000437
Chris Lattner9abc84e2007-08-26 16:42:57 +0000438 // Compare against an integer or pointer null.
Owen Andersonc9c88b42009-07-31 20:28:54 +0000439 llvm::Value *Zero = llvm::Constant::getNullValue(Src->getType());
Chris Lattner9abc84e2007-08-26 16:42:57 +0000440 return Builder.CreateICmpNE(Src, Zero, "tobool");
441}
442
Chris Lattner3707b252007-08-26 06:48:56 +0000443/// EmitScalarConversion - Emit a conversion from the specified type to the
444/// specified destination type, both of which are LLVM scalar types.
Chris Lattner4f1a7b32007-08-26 16:34:22 +0000445Value *ScalarExprEmitter::EmitScalarConversion(Value *Src, QualType SrcType,
446 QualType DstType) {
Chris Lattner96196622008-07-26 22:37:01 +0000447 SrcType = CGF.getContext().getCanonicalType(SrcType);
448 DstType = CGF.getContext().getCanonicalType(DstType);
Chris Lattner3707b252007-08-26 06:48:56 +0000449 if (SrcType == DstType) return Src;
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000450
Chris Lattnercf289082007-08-26 07:21:11 +0000451 if (DstType->isVoidType()) return 0;
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000452
Chris Lattner3707b252007-08-26 06:48:56 +0000453 // Handle conversions to bool first, they are special: comparisons against 0.
Chris Lattnered70f0a2007-08-26 16:52:28 +0000454 if (DstType->isBooleanType())
455 return EmitConversionToBool(Src, SrcType);
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000456
Chris Lattner3707b252007-08-26 06:48:56 +0000457 const llvm::Type *DstTy = ConvertType(DstType);
458
459 // Ignore conversions like int -> uint.
460 if (Src->getType() == DstTy)
461 return Src;
462
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000463 // Handle pointer conversions next: pointers can only be converted to/from
464 // other pointers and integers. Check for pointer types in terms of LLVM, as
465 // some native types (like Obj-C id) may map to a pointer type.
Daniel Dunbar270cc662008-08-25 09:51:32 +0000466 if (isa<llvm::PointerType>(DstTy)) {
Chris Lattner3707b252007-08-26 06:48:56 +0000467 // The source value may be an integer, or a pointer.
Anders Carlsson191dfe92009-09-12 04:57:16 +0000468 if (isa<llvm::PointerType>(Src->getType()))
Chris Lattner3707b252007-08-26 06:48:56 +0000469 return Builder.CreateBitCast(Src, DstTy, "conv");
Anders Carlsson191dfe92009-09-12 04:57:16 +0000470
Chris Lattner3707b252007-08-26 06:48:56 +0000471 assert(SrcType->isIntegerType() && "Not ptr->ptr or int->ptr conversion?");
Eli Friedman25615422009-03-04 04:02:35 +0000472 // First, convert to the correct width so that we control the kind of
473 // extension.
Chris Lattner77b89b82010-06-27 07:15:29 +0000474 const llvm::Type *MiddleTy = CGF.IntPtrTy;
Eli Friedman25615422009-03-04 04:02:35 +0000475 bool InputSigned = SrcType->isSignedIntegerType();
476 llvm::Value* IntResult =
477 Builder.CreateIntCast(Src, MiddleTy, InputSigned, "conv");
478 // Then, cast to pointer.
479 return Builder.CreateIntToPtr(IntResult, DstTy, "conv");
Chris Lattner3707b252007-08-26 06:48:56 +0000480 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000481
Daniel Dunbar270cc662008-08-25 09:51:32 +0000482 if (isa<llvm::PointerType>(Src->getType())) {
Chris Lattner3707b252007-08-26 06:48:56 +0000483 // Must be an ptr to int cast.
484 assert(isa<llvm::IntegerType>(DstTy) && "not ptr->int?");
Anders Carlsson50b5a302007-10-31 23:18:02 +0000485 return Builder.CreatePtrToInt(Src, DstTy, "conv");
Chris Lattner3707b252007-08-26 06:48:56 +0000486 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000487
Nate Begeman213541a2008-04-18 23:10:10 +0000488 // A scalar can be splatted to an extended vector of the same element type
Nate Begeman2ef13e52009-08-10 23:49:36 +0000489 if (DstType->isExtVectorType() && !SrcType->isVectorType()) {
Nate Begeman6fe7c8a2009-01-18 06:42:49 +0000490 // Cast the scalar to element type
John McCall183700f2009-09-21 23:43:11 +0000491 QualType EltTy = DstType->getAs<ExtVectorType>()->getElementType();
Nate Begeman6fe7c8a2009-01-18 06:42:49 +0000492 llvm::Value *Elt = EmitScalarConversion(Src, SrcType, EltTy);
493
494 // Insert the element in element zero of an undef vector
Owen Anderson03e20502009-07-30 23:11:26 +0000495 llvm::Value *UnV = llvm::UndefValue::get(DstTy);
Chris Lattner77b89b82010-06-27 07:15:29 +0000496 llvm::Value *Idx = llvm::ConstantInt::get(CGF.Int32Ty, 0);
Nate Begeman6fe7c8a2009-01-18 06:42:49 +0000497 UnV = Builder.CreateInsertElement(UnV, Elt, Idx, "tmp");
498
499 // Splat the element across to all elements
500 llvm::SmallVector<llvm::Constant*, 16> Args;
501 unsigned NumElements = cast<llvm::VectorType>(DstTy)->getNumElements();
502 for (unsigned i = 0; i < NumElements; i++)
Chris Lattner77b89b82010-06-27 07:15:29 +0000503 Args.push_back(llvm::ConstantInt::get(CGF.Int32Ty, 0));
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000504
Owen Anderson4a289322009-07-28 21:22:35 +0000505 llvm::Constant *Mask = llvm::ConstantVector::get(&Args[0], NumElements);
Nate Begeman6fe7c8a2009-01-18 06:42:49 +0000506 llvm::Value *Yay = Builder.CreateShuffleVector(UnV, UnV, Mask, "splat");
507 return Yay;
508 }
Nate Begeman4119d1a2007-12-30 02:59:45 +0000509
Chris Lattner3b1ae002008-02-02 04:51:41 +0000510 // Allow bitcast from vector to integer/fp of the same size.
Anders Carlsson7019a9e2007-12-05 07:36:10 +0000511 if (isa<llvm::VectorType>(Src->getType()) ||
Chris Lattner3b1ae002008-02-02 04:51:41 +0000512 isa<llvm::VectorType>(DstTy))
Anders Carlsson7019a9e2007-12-05 07:36:10 +0000513 return Builder.CreateBitCast(Src, DstTy, "conv");
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000514
Chris Lattner3707b252007-08-26 06:48:56 +0000515 // Finally, we have the arithmetic types: real int/float.
516 if (isa<llvm::IntegerType>(Src->getType())) {
517 bool InputSigned = SrcType->isSignedIntegerType();
Anders Carlssonb5ce0972007-12-26 18:20:19 +0000518 if (isa<llvm::IntegerType>(DstTy))
519 return Builder.CreateIntCast(Src, DstTy, InputSigned, "conv");
520 else if (InputSigned)
521 return Builder.CreateSIToFP(Src, DstTy, "conv");
522 else
523 return Builder.CreateUIToFP(Src, DstTy, "conv");
Chris Lattner3707b252007-08-26 06:48:56 +0000524 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000525
Duncan Sandsf177d9d2010-02-15 16:14:01 +0000526 assert(Src->getType()->isFloatingPointTy() && "Unknown real conversion");
Chris Lattner3707b252007-08-26 06:48:56 +0000527 if (isa<llvm::IntegerType>(DstTy)) {
Anders Carlssonb5ce0972007-12-26 18:20:19 +0000528 if (DstType->isSignedIntegerType())
529 return Builder.CreateFPToSI(Src, DstTy, "conv");
530 else
531 return Builder.CreateFPToUI(Src, DstTy, "conv");
Chris Lattner3707b252007-08-26 06:48:56 +0000532 }
533
Duncan Sandsf177d9d2010-02-15 16:14:01 +0000534 assert(DstTy->isFloatingPointTy() && "Unknown real conversion");
Anders Carlssonb5ce0972007-12-26 18:20:19 +0000535 if (DstTy->getTypeID() < Src->getType()->getTypeID())
536 return Builder.CreateFPTrunc(Src, DstTy, "conv");
537 else
538 return Builder.CreateFPExt(Src, DstTy, "conv");
Chris Lattner3707b252007-08-26 06:48:56 +0000539}
540
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000541/// EmitComplexToScalarConversion - Emit a conversion from the specified complex
542/// type to the specified destination type, where the destination type is an
543/// LLVM scalar type.
Chris Lattner4f1a7b32007-08-26 16:34:22 +0000544Value *ScalarExprEmitter::
545EmitComplexToScalarConversion(CodeGenFunction::ComplexPairTy Src,
546 QualType SrcTy, QualType DstTy) {
Chris Lattnered70f0a2007-08-26 16:52:28 +0000547 // Get the source element type.
John McCall183700f2009-09-21 23:43:11 +0000548 SrcTy = SrcTy->getAs<ComplexType>()->getElementType();
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000549
Chris Lattnered70f0a2007-08-26 16:52:28 +0000550 // Handle conversions to bool first, they are special: comparisons against 0.
551 if (DstTy->isBooleanType()) {
552 // Complex != 0 -> (Real != 0) | (Imag != 0)
553 Src.first = EmitScalarConversion(Src.first, SrcTy, DstTy);
554 Src.second = EmitScalarConversion(Src.second, SrcTy, DstTy);
555 return Builder.CreateOr(Src.first, Src.second, "tobool");
556 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000557
Chris Lattner4f1a7b32007-08-26 16:34:22 +0000558 // C99 6.3.1.7p2: "When a value of complex type is converted to a real type,
559 // the imaginary part of the complex value is discarded and the value of the
560 // real part is converted according to the conversion rules for the
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000561 // corresponding real type.
Chris Lattner4f1a7b32007-08-26 16:34:22 +0000562 return EmitScalarConversion(Src.first, SrcTy, DstTy);
563}
564
Anders Carlssona40a9f32010-05-22 17:45:10 +0000565Value *ScalarExprEmitter::EmitNullValue(QualType Ty) {
566 const llvm::Type *LTy = ConvertType(Ty);
567
568 if (!Ty->isMemberPointerType())
569 return llvm::Constant::getNullValue(LTy);
570
571 assert(!Ty->isMemberFunctionPointerType() &&
572 "member function pointers are not scalar!");
573
574 // Itanium C++ ABI 2.3:
575 // A NULL pointer is represented as -1.
576 return llvm::ConstantInt::get(LTy, -1ULL, /*isSigned=*/true);
577}
Chris Lattner4f1a7b32007-08-26 16:34:22 +0000578
Chris Lattner7f02f722007-08-24 05:35:26 +0000579//===----------------------------------------------------------------------===//
580// Visitor Methods
581//===----------------------------------------------------------------------===//
582
583Value *ScalarExprEmitter::VisitExpr(Expr *E) {
Daniel Dunbar488e9932008-08-16 00:56:44 +0000584 CGF.ErrorUnsupported(E, "scalar expression");
Chris Lattner7f02f722007-08-24 05:35:26 +0000585 if (E->getType()->isVoidType())
586 return 0;
Owen Anderson03e20502009-07-30 23:11:26 +0000587 return llvm::UndefValue::get(CGF.ConvertType(E->getType()));
Chris Lattner7f02f722007-08-24 05:35:26 +0000588}
589
Eli Friedmand38617c2008-05-14 19:38:39 +0000590Value *ScalarExprEmitter::VisitShuffleVectorExpr(ShuffleVectorExpr *E) {
Nate Begeman37b6a572010-06-08 00:16:34 +0000591 // Vector Mask Case
592 if (E->getNumSubExprs() == 2 ||
Rafael Espindola3f4cb122010-06-09 02:17:08 +0000593 (E->getNumSubExprs() == 3 && E->getExpr(2)->getType()->isVectorType())) {
Chris Lattner77b89b82010-06-27 07:15:29 +0000594 Value *LHS = CGF.EmitScalarExpr(E->getExpr(0));
595 Value *RHS = CGF.EmitScalarExpr(E->getExpr(1));
596 Value *Mask;
Nate Begeman37b6a572010-06-08 00:16:34 +0000597
Nate Begeman37b6a572010-06-08 00:16:34 +0000598 const llvm::VectorType *LTy = cast<llvm::VectorType>(LHS->getType());
599 unsigned LHSElts = LTy->getNumElements();
600
601 if (E->getNumSubExprs() == 3) {
602 Mask = CGF.EmitScalarExpr(E->getExpr(2));
603
604 // Shuffle LHS & RHS into one input vector.
605 llvm::SmallVector<llvm::Constant*, 32> concat;
606 for (unsigned i = 0; i != LHSElts; ++i) {
Chris Lattner77b89b82010-06-27 07:15:29 +0000607 concat.push_back(llvm::ConstantInt::get(CGF.Int32Ty, 2*i));
608 concat.push_back(llvm::ConstantInt::get(CGF.Int32Ty, 2*i+1));
Nate Begeman37b6a572010-06-08 00:16:34 +0000609 }
610
611 Value* CV = llvm::ConstantVector::get(concat.begin(), concat.size());
612 LHS = Builder.CreateShuffleVector(LHS, RHS, CV, "concat");
613 LHSElts *= 2;
614 } else {
615 Mask = RHS;
616 }
617
618 const llvm::VectorType *MTy = cast<llvm::VectorType>(Mask->getType());
619 llvm::Constant* EltMask;
620
621 // Treat vec3 like vec4.
622 if ((LHSElts == 6) && (E->getNumSubExprs() == 3))
623 EltMask = llvm::ConstantInt::get(MTy->getElementType(),
624 (1 << llvm::Log2_32(LHSElts+2))-1);
625 else if ((LHSElts == 3) && (E->getNumSubExprs() == 2))
626 EltMask = llvm::ConstantInt::get(MTy->getElementType(),
627 (1 << llvm::Log2_32(LHSElts+1))-1);
628 else
629 EltMask = llvm::ConstantInt::get(MTy->getElementType(),
630 (1 << llvm::Log2_32(LHSElts))-1);
631
632 // Mask off the high bits of each shuffle index.
633 llvm::SmallVector<llvm::Constant *, 32> MaskV;
634 for (unsigned i = 0, e = MTy->getNumElements(); i != e; ++i)
635 MaskV.push_back(EltMask);
636
637 Value* MaskBits = llvm::ConstantVector::get(MaskV.begin(), MaskV.size());
638 Mask = Builder.CreateAnd(Mask, MaskBits, "mask");
639
640 // newv = undef
641 // mask = mask & maskbits
642 // for each elt
643 // n = extract mask i
644 // x = extract val n
645 // newv = insert newv, x, i
646 const llvm::VectorType *RTy = llvm::VectorType::get(LTy->getElementType(),
647 MTy->getNumElements());
648 Value* NewV = llvm::UndefValue::get(RTy);
649 for (unsigned i = 0, e = MTy->getNumElements(); i != e; ++i) {
Chris Lattner77b89b82010-06-27 07:15:29 +0000650 Value *Indx = llvm::ConstantInt::get(CGF.Int32Ty, i);
Nate Begeman37b6a572010-06-08 00:16:34 +0000651 Indx = Builder.CreateExtractElement(Mask, Indx, "shuf_idx");
Chris Lattner77b89b82010-06-27 07:15:29 +0000652 Indx = Builder.CreateZExt(Indx, CGF.Int32Ty, "idx_zext");
Nate Begeman37b6a572010-06-08 00:16:34 +0000653
654 // Handle vec3 special since the index will be off by one for the RHS.
655 if ((LHSElts == 6) && (E->getNumSubExprs() == 3)) {
656 Value *cmpIndx, *newIndx;
Chris Lattner77b89b82010-06-27 07:15:29 +0000657 cmpIndx = Builder.CreateICmpUGT(Indx,
658 llvm::ConstantInt::get(CGF.Int32Ty, 3),
Nate Begeman37b6a572010-06-08 00:16:34 +0000659 "cmp_shuf_idx");
Chris Lattner77b89b82010-06-27 07:15:29 +0000660 newIndx = Builder.CreateSub(Indx, llvm::ConstantInt::get(CGF.Int32Ty,1),
Nate Begeman37b6a572010-06-08 00:16:34 +0000661 "shuf_idx_adj");
662 Indx = Builder.CreateSelect(cmpIndx, newIndx, Indx, "sel_shuf_idx");
663 }
664 Value *VExt = Builder.CreateExtractElement(LHS, Indx, "shuf_elt");
665 NewV = Builder.CreateInsertElement(NewV, VExt, Indx, "shuf_ins");
666 }
667 return NewV;
Eli Friedmand38617c2008-05-14 19:38:39 +0000668 }
Nate Begeman37b6a572010-06-08 00:16:34 +0000669
Eli Friedmand38617c2008-05-14 19:38:39 +0000670 Value* V1 = CGF.EmitScalarExpr(E->getExpr(0));
671 Value* V2 = CGF.EmitScalarExpr(E->getExpr(1));
Nate Begeman37b6a572010-06-08 00:16:34 +0000672
673 // Handle vec3 special since the index will be off by one for the RHS.
674 llvm::SmallVector<llvm::Constant*, 32> indices;
675 for (unsigned i = 2; i < E->getNumSubExprs(); i++) {
676 llvm::Constant *C = cast<llvm::Constant>(CGF.EmitScalarExpr(E->getExpr(i)));
677 const llvm::VectorType *VTy = cast<llvm::VectorType>(V1->getType());
678 if (VTy->getNumElements() == 3) {
679 if (llvm::ConstantInt *CI = dyn_cast<llvm::ConstantInt>(C)) {
680 uint64_t cVal = CI->getZExtValue();
681 if (cVal > 3) {
682 C = llvm::ConstantInt::get(C->getType(), cVal-1);
683 }
684 }
685 }
686 indices.push_back(C);
687 }
688
Owen Anderson4a289322009-07-28 21:22:35 +0000689 Value* SV = llvm::ConstantVector::get(indices.begin(), indices.size());
Eli Friedmand38617c2008-05-14 19:38:39 +0000690 return Builder.CreateShuffleVector(V1, V2, SV, "shuffle");
691}
Eli Friedman28665272009-11-26 03:22:21 +0000692Value *ScalarExprEmitter::VisitMemberExpr(MemberExpr *E) {
693 Expr::EvalResult Result;
694 if (E->Evaluate(Result, CGF.getContext()) && Result.Val.isInt()) {
695 if (E->isArrow())
696 CGF.EmitScalarExpr(E->getBase());
697 else
698 EmitLValue(E->getBase());
699 return llvm::ConstantInt::get(VMContext, Result.Val.getInt());
700 }
701 return EmitLoadOfLValue(E);
702}
Eli Friedmand38617c2008-05-14 19:38:39 +0000703
Chris Lattner7f02f722007-08-24 05:35:26 +0000704Value *ScalarExprEmitter::VisitArraySubscriptExpr(ArraySubscriptExpr *E) {
Mike Stump7f79f9b2009-05-29 15:46:01 +0000705 TestAndClearIgnoreResultAssign();
706
Chris Lattner7f02f722007-08-24 05:35:26 +0000707 // Emit subscript expressions in rvalue context's. For most cases, this just
708 // loads the lvalue formed by the subscript expr. However, we have to be
709 // careful, because the base of a vector subscript is occasionally an rvalue,
710 // so we can't get it as an lvalue.
711 if (!E->getBase()->getType()->isVectorType())
712 return EmitLoadOfLValue(E);
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000713
Chris Lattner7f02f722007-08-24 05:35:26 +0000714 // Handle the vector case. The base must be a vector, the index must be an
715 // integer value.
716 Value *Base = Visit(E->getBase());
717 Value *Idx = Visit(E->getIdx());
Eli Friedmandaa24a22009-03-28 02:45:41 +0000718 bool IdxSigned = E->getIdx()->getType()->isSignedIntegerType();
Chris Lattner77b89b82010-06-27 07:15:29 +0000719 Idx = Builder.CreateIntCast(Idx, CGF.Int32Ty, IdxSigned, "vecidxcast");
Chris Lattner7f02f722007-08-24 05:35:26 +0000720 return Builder.CreateExtractElement(Base, Idx, "vecext");
721}
722
Nate Begeman0533b302009-10-18 20:10:40 +0000723static llvm::Constant *getMaskElt(llvm::ShuffleVectorInst *SVI, unsigned Idx,
724 unsigned Off, const llvm::Type *I32Ty) {
725 int MV = SVI->getMaskValue(Idx);
726 if (MV == -1)
727 return llvm::UndefValue::get(I32Ty);
728 return llvm::ConstantInt::get(I32Ty, Off+MV);
729}
730
731Value *ScalarExprEmitter::VisitInitListExpr(InitListExpr *E) {
732 bool Ignore = TestAndClearIgnoreResultAssign();
733 (void)Ignore;
734 assert (Ignore == false && "init list ignored");
735 unsigned NumInitElements = E->getNumInits();
736
737 if (E->hadArrayRangeDesignator())
738 CGF.ErrorUnsupported(E, "GNU array range designator extension");
739
740 const llvm::VectorType *VType =
741 dyn_cast<llvm::VectorType>(ConvertType(E->getType()));
742
743 // We have a scalar in braces. Just use the first element.
744 if (!VType)
745 return Visit(E->getInit(0));
746
747 unsigned ResElts = VType->getNumElements();
Nate Begeman0533b302009-10-18 20:10:40 +0000748
749 // Loop over initializers collecting the Value for each, and remembering
750 // whether the source was swizzle (ExtVectorElementExpr). This will allow
751 // us to fold the shuffle for the swizzle into the shuffle for the vector
752 // initializer, since LLVM optimizers generally do not want to touch
753 // shuffles.
754 unsigned CurIdx = 0;
755 bool VIsUndefShuffle = false;
756 llvm::Value *V = llvm::UndefValue::get(VType);
757 for (unsigned i = 0; i != NumInitElements; ++i) {
758 Expr *IE = E->getInit(i);
759 Value *Init = Visit(IE);
760 llvm::SmallVector<llvm::Constant*, 16> Args;
761
762 const llvm::VectorType *VVT = dyn_cast<llvm::VectorType>(Init->getType());
763
764 // Handle scalar elements. If the scalar initializer is actually one
765 // element of a different vector of the same width, use shuffle instead of
766 // extract+insert.
767 if (!VVT) {
768 if (isa<ExtVectorElementExpr>(IE)) {
769 llvm::ExtractElementInst *EI = cast<llvm::ExtractElementInst>(Init);
770
771 if (EI->getVectorOperandType()->getNumElements() == ResElts) {
772 llvm::ConstantInt *C = cast<llvm::ConstantInt>(EI->getIndexOperand());
773 Value *LHS = 0, *RHS = 0;
774 if (CurIdx == 0) {
775 // insert into undef -> shuffle (src, undef)
776 Args.push_back(C);
777 for (unsigned j = 1; j != ResElts; ++j)
Chris Lattner77b89b82010-06-27 07:15:29 +0000778 Args.push_back(llvm::UndefValue::get(CGF.Int32Ty));
Nate Begeman0533b302009-10-18 20:10:40 +0000779
780 LHS = EI->getVectorOperand();
781 RHS = V;
782 VIsUndefShuffle = true;
783 } else if (VIsUndefShuffle) {
784 // insert into undefshuffle && size match -> shuffle (v, src)
785 llvm::ShuffleVectorInst *SVV = cast<llvm::ShuffleVectorInst>(V);
786 for (unsigned j = 0; j != CurIdx; ++j)
Chris Lattner77b89b82010-06-27 07:15:29 +0000787 Args.push_back(getMaskElt(SVV, j, 0, CGF.Int32Ty));
788 Args.push_back(llvm::ConstantInt::get(CGF.Int32Ty,
Nate Begeman0533b302009-10-18 20:10:40 +0000789 ResElts + C->getZExtValue()));
790 for (unsigned j = CurIdx + 1; j != ResElts; ++j)
Chris Lattner77b89b82010-06-27 07:15:29 +0000791 Args.push_back(llvm::UndefValue::get(CGF.Int32Ty));
Nate Begeman0533b302009-10-18 20:10:40 +0000792
793 LHS = cast<llvm::ShuffleVectorInst>(V)->getOperand(0);
794 RHS = EI->getVectorOperand();
795 VIsUndefShuffle = false;
796 }
797 if (!Args.empty()) {
798 llvm::Constant *Mask = llvm::ConstantVector::get(&Args[0], ResElts);
799 V = Builder.CreateShuffleVector(LHS, RHS, Mask);
800 ++CurIdx;
801 continue;
802 }
803 }
804 }
Chris Lattner77b89b82010-06-27 07:15:29 +0000805 Value *Idx = llvm::ConstantInt::get(CGF.Int32Ty, CurIdx);
Nate Begeman0533b302009-10-18 20:10:40 +0000806 V = Builder.CreateInsertElement(V, Init, Idx, "vecinit");
807 VIsUndefShuffle = false;
808 ++CurIdx;
809 continue;
810 }
811
812 unsigned InitElts = VVT->getNumElements();
813
814 // If the initializer is an ExtVecEltExpr (a swizzle), and the swizzle's
815 // input is the same width as the vector being constructed, generate an
816 // optimized shuffle of the swizzle input into the result.
Nate Begemana99f0832009-10-25 02:26:01 +0000817 unsigned Offset = (CurIdx == 0) ? 0 : ResElts;
Nate Begeman0533b302009-10-18 20:10:40 +0000818 if (isa<ExtVectorElementExpr>(IE)) {
819 llvm::ShuffleVectorInst *SVI = cast<llvm::ShuffleVectorInst>(Init);
820 Value *SVOp = SVI->getOperand(0);
821 const llvm::VectorType *OpTy = cast<llvm::VectorType>(SVOp->getType());
822
823 if (OpTy->getNumElements() == ResElts) {
Nate Begeman0533b302009-10-18 20:10:40 +0000824 for (unsigned j = 0; j != CurIdx; ++j) {
825 // If the current vector initializer is a shuffle with undef, merge
826 // this shuffle directly into it.
827 if (VIsUndefShuffle) {
828 Args.push_back(getMaskElt(cast<llvm::ShuffleVectorInst>(V), j, 0,
Chris Lattner77b89b82010-06-27 07:15:29 +0000829 CGF.Int32Ty));
Nate Begeman0533b302009-10-18 20:10:40 +0000830 } else {
Chris Lattner77b89b82010-06-27 07:15:29 +0000831 Args.push_back(llvm::ConstantInt::get(CGF.Int32Ty, j));
Nate Begeman0533b302009-10-18 20:10:40 +0000832 }
833 }
834 for (unsigned j = 0, je = InitElts; j != je; ++j)
Chris Lattner77b89b82010-06-27 07:15:29 +0000835 Args.push_back(getMaskElt(SVI, j, Offset, CGF.Int32Ty));
Nate Begeman0533b302009-10-18 20:10:40 +0000836 for (unsigned j = CurIdx + InitElts; j != ResElts; ++j)
Chris Lattner77b89b82010-06-27 07:15:29 +0000837 Args.push_back(llvm::UndefValue::get(CGF.Int32Ty));
Nate Begeman0533b302009-10-18 20:10:40 +0000838
839 if (VIsUndefShuffle)
840 V = cast<llvm::ShuffleVectorInst>(V)->getOperand(0);
841
842 Init = SVOp;
843 }
844 }
845
846 // Extend init to result vector length, and then shuffle its contribution
847 // to the vector initializer into V.
848 if (Args.empty()) {
849 for (unsigned j = 0; j != InitElts; ++j)
Chris Lattner77b89b82010-06-27 07:15:29 +0000850 Args.push_back(llvm::ConstantInt::get(CGF.Int32Ty, j));
Nate Begeman0533b302009-10-18 20:10:40 +0000851 for (unsigned j = InitElts; j != ResElts; ++j)
Chris Lattner77b89b82010-06-27 07:15:29 +0000852 Args.push_back(llvm::UndefValue::get(CGF.Int32Ty));
Nate Begeman0533b302009-10-18 20:10:40 +0000853 llvm::Constant *Mask = llvm::ConstantVector::get(&Args[0], ResElts);
854 Init = Builder.CreateShuffleVector(Init, llvm::UndefValue::get(VVT),
Nate Begemana99f0832009-10-25 02:26:01 +0000855 Mask, "vext");
Nate Begeman0533b302009-10-18 20:10:40 +0000856
857 Args.clear();
858 for (unsigned j = 0; j != CurIdx; ++j)
Chris Lattner77b89b82010-06-27 07:15:29 +0000859 Args.push_back(llvm::ConstantInt::get(CGF.Int32Ty, j));
Nate Begeman0533b302009-10-18 20:10:40 +0000860 for (unsigned j = 0; j != InitElts; ++j)
Chris Lattner77b89b82010-06-27 07:15:29 +0000861 Args.push_back(llvm::ConstantInt::get(CGF.Int32Ty, j+Offset));
Nate Begeman0533b302009-10-18 20:10:40 +0000862 for (unsigned j = CurIdx + InitElts; j != ResElts; ++j)
Chris Lattner77b89b82010-06-27 07:15:29 +0000863 Args.push_back(llvm::UndefValue::get(CGF.Int32Ty));
Nate Begeman0533b302009-10-18 20:10:40 +0000864 }
865
866 // If V is undef, make sure it ends up on the RHS of the shuffle to aid
867 // merging subsequent shuffles into this one.
868 if (CurIdx == 0)
869 std::swap(V, Init);
870 llvm::Constant *Mask = llvm::ConstantVector::get(&Args[0], ResElts);
871 V = Builder.CreateShuffleVector(V, Init, Mask, "vecinit");
872 VIsUndefShuffle = isa<llvm::UndefValue>(Init);
873 CurIdx += InitElts;
874 }
875
876 // FIXME: evaluate codegen vs. shuffling against constant null vector.
877 // Emit remaining default initializers.
878 const llvm::Type *EltTy = VType->getElementType();
879
880 // Emit remaining default initializers
881 for (/* Do not initialize i*/; CurIdx < ResElts; ++CurIdx) {
Chris Lattner77b89b82010-06-27 07:15:29 +0000882 Value *Idx = llvm::ConstantInt::get(CGF.Int32Ty, CurIdx);
Nate Begeman0533b302009-10-18 20:10:40 +0000883 llvm::Value *Init = llvm::Constant::getNullValue(EltTy);
884 V = Builder.CreateInsertElement(V, Init, Idx, "vecinit");
885 }
886 return V;
887}
888
Anders Carlssona3697c92009-11-23 17:57:54 +0000889static bool ShouldNullCheckClassCastValue(const CastExpr *CE) {
890 const Expr *E = CE->getSubExpr();
John McCall23cba802010-03-30 23:58:03 +0000891
892 if (CE->getCastKind() == CastExpr::CK_UncheckedDerivedToBase)
893 return false;
Anders Carlssona3697c92009-11-23 17:57:54 +0000894
895 if (isa<CXXThisExpr>(E)) {
896 // We always assume that 'this' is never null.
897 return false;
898 }
899
900 if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(CE)) {
Sebastian Redl906082e2010-07-20 04:20:21 +0000901 // And that glvalue casts are never null.
902 if (ICE->getCategory() != ImplicitCastExpr::RValue)
Anders Carlssona3697c92009-11-23 17:57:54 +0000903 return false;
904 }
905
906 return true;
907}
908
Chris Lattner7f02f722007-08-24 05:35:26 +0000909// VisitCastExpr - Emit code for an explicit or implicit cast. Implicit casts
910// have to handle a more broad range of conversions than explicit casts, as they
911// handle things like function to ptr-to-function decay etc.
Eli Friedmand8889622009-11-27 04:41:50 +0000912Value *ScalarExprEmitter::EmitCastExpr(CastExpr *CE) {
913 Expr *E = CE->getSubExpr();
Anders Carlsson592a2bb2009-09-22 22:00:46 +0000914 QualType DestTy = CE->getType();
915 CastExpr::CastKind Kind = CE->getCastKind();
916
Mike Stump7f79f9b2009-05-29 15:46:01 +0000917 if (!DestTy->isVoidType())
918 TestAndClearIgnoreResultAssign();
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000919
Eli Friedman8c3e7e72009-11-27 02:07:44 +0000920 // Since almost all cast kinds apply to scalars, this switch doesn't have
921 // a default case, so the compiler will warn on a missing case. The cases
922 // are in the same order as in the CastKind enum.
Anders Carlssone9776242009-08-24 18:26:39 +0000923 switch (Kind) {
Anders Carlsson7f9e6462009-09-15 04:48:33 +0000924 case CastExpr::CK_Unknown:
Eli Friedmand8889622009-11-27 04:41:50 +0000925 // FIXME: All casts should have a known kind!
Eli Friedmanad35a832009-11-16 21:33:53 +0000926 //assert(0 && "Unknown cast kind!");
Anders Carlssone9776242009-08-24 18:26:39 +0000927 break;
Eli Friedmanad35a832009-11-16 21:33:53 +0000928
Douglas Gregor569c3162010-08-07 11:51:51 +0000929 case CastExpr::CK_LValueBitCast:
930 case CastExpr::CK_ObjCObjectLValueCast: {
Douglas Gregore39a3892010-07-13 23:17:26 +0000931 Value *V = EmitLValue(E).getAddress();
932 V = Builder.CreateBitCast(V,
933 ConvertType(CGF.getContext().getPointerType(DestTy)));
934 // FIXME: Are the qualifiers correct here?
935 return EmitLoadOfLValue(LValue::MakeAddr(V, CGF.MakeQualifiers(DestTy)),
936 DestTy);
937 }
938
Fariborz Jahanian92ef5d72009-12-08 23:09:15 +0000939 case CastExpr::CK_AnyPointerToObjCPointerCast:
Fariborz Jahanian3b27f1a2009-12-11 22:40:48 +0000940 case CastExpr::CK_AnyPointerToBlockPointerCast:
Anders Carlssoncb3c3082009-09-01 20:52:42 +0000941 case CastExpr::CK_BitCast: {
942 Value *Src = Visit(const_cast<Expr*>(E));
943 return Builder.CreateBitCast(Src, ConvertType(DestTy));
944 }
Eli Friedmanad35a832009-11-16 21:33:53 +0000945 case CastExpr::CK_NoOp:
Anders Carlsson0ddb6f72009-12-18 14:42:03 +0000946 case CastExpr::CK_UserDefinedConversion:
Eli Friedmanad35a832009-11-16 21:33:53 +0000947 return Visit(const_cast<Expr*>(E));
Mike Stumpdb52dcd2009-09-09 13:00:44 +0000948
Anders Carlssona3697c92009-11-23 17:57:54 +0000949 case CastExpr::CK_BaseToDerived: {
Anders Carlssona3697c92009-11-23 17:57:54 +0000950 const CXXRecordDecl *DerivedClassDecl =
951 DestTy->getCXXRecordDeclForPointerType();
952
Anders Carlssona04efdf2010-04-24 21:23:59 +0000953 return CGF.GetAddressOfDerivedClass(Visit(E), DerivedClassDecl,
John McCallf871d0c2010-08-07 06:22:56 +0000954 CE->path_begin(), CE->path_end(),
Anders Carlssona04efdf2010-04-24 21:23:59 +0000955 ShouldNullCheckClassCastValue(CE));
Anders Carlssona3697c92009-11-23 17:57:54 +0000956 }
John McCall23cba802010-03-30 23:58:03 +0000957 case CastExpr::CK_UncheckedDerivedToBase:
Anders Carlsson191dfe92009-09-12 04:57:16 +0000958 case CastExpr::CK_DerivedToBase: {
959 const RecordType *DerivedClassTy =
960 E->getType()->getAs<PointerType>()->getPointeeType()->getAs<RecordType>();
961 CXXRecordDecl *DerivedClassDecl =
962 cast<CXXRecordDecl>(DerivedClassTy->getDecl());
963
Anders Carlsson34a2d382010-04-24 21:06:20 +0000964 return CGF.GetAddressOfBaseClass(Visit(E), DerivedClassDecl,
John McCallf871d0c2010-08-07 06:22:56 +0000965 CE->path_begin(), CE->path_end(),
Anders Carlsson34a2d382010-04-24 21:06:20 +0000966 ShouldNullCheckClassCastValue(CE));
Anders Carlsson191dfe92009-09-12 04:57:16 +0000967 }
Eli Friedman8c3e7e72009-11-27 02:07:44 +0000968 case CastExpr::CK_Dynamic: {
969 Value *V = Visit(const_cast<Expr*>(E));
970 const CXXDynamicCastExpr *DCE = cast<CXXDynamicCastExpr>(CE);
971 return CGF.EmitDynamicCast(V, DCE);
972 }
Eli Friedmand8889622009-11-27 04:41:50 +0000973 case CastExpr::CK_ToUnion:
Eli Friedmanad35a832009-11-16 21:33:53 +0000974 assert(0 && "Should be unreachable!");
975 break;
Eli Friedmand8889622009-11-27 04:41:50 +0000976
Eli Friedmanad35a832009-11-16 21:33:53 +0000977 case CastExpr::CK_ArrayToPointerDecay: {
978 assert(E->getType()->isArrayType() &&
979 "Array to pointer decay must have array source type!");
980
981 Value *V = EmitLValue(E).getAddress(); // Bitfields can't be arrays.
982
983 // Note that VLA pointers are always decayed, so we don't need to do
984 // anything here.
985 if (!E->getType()->isVariableArrayType()) {
986 assert(isa<llvm::PointerType>(V->getType()) && "Expected pointer");
987 assert(isa<llvm::ArrayType>(cast<llvm::PointerType>(V->getType())
988 ->getElementType()) &&
989 "Expected pointer to array");
990 V = Builder.CreateStructGEP(V, 0, "arraydecay");
991 }
992
993 return V;
994 }
995 case CastExpr::CK_FunctionToPointerDecay:
996 return EmitLValue(E).getAddress();
997
998 case CastExpr::CK_NullToMemberPointer:
999 return CGF.CGM.EmitNullConstant(DestTy);
Anders Carlsson191dfe92009-09-12 04:57:16 +00001000
Eli Friedman8c3e7e72009-11-27 02:07:44 +00001001 case CastExpr::CK_BaseToDerivedMemberPointer:
Eli Friedmand8889622009-11-27 04:41:50 +00001002 case CastExpr::CK_DerivedToBaseMemberPointer: {
1003 Value *Src = Visit(E);
1004
1005 // See if we need to adjust the pointer.
1006 const CXXRecordDecl *BaseDecl =
1007 cast<CXXRecordDecl>(E->getType()->getAs<MemberPointerType>()->
1008 getClass()->getAs<RecordType>()->getDecl());
1009 const CXXRecordDecl *DerivedDecl =
1010 cast<CXXRecordDecl>(CE->getType()->getAs<MemberPointerType>()->
1011 getClass()->getAs<RecordType>()->getDecl());
1012 if (CE->getCastKind() == CastExpr::CK_DerivedToBaseMemberPointer)
1013 std::swap(DerivedDecl, BaseDecl);
1014
Anders Carlssonbb7e17b2010-01-31 01:36:53 +00001015 if (llvm::Constant *Adj =
John McCallf871d0c2010-08-07 06:22:56 +00001016 CGF.CGM.GetNonVirtualBaseClassOffset(DerivedDecl,
1017 CE->path_begin(),
1018 CE->path_end())) {
Eli Friedmand8889622009-11-27 04:41:50 +00001019 if (CE->getCastKind() == CastExpr::CK_DerivedToBaseMemberPointer)
Chris Lattnere70ffd62010-06-26 20:27:24 +00001020 Src = Builder.CreateNSWSub(Src, Adj, "adj");
Eli Friedmand8889622009-11-27 04:41:50 +00001021 else
Chris Lattnere70ffd62010-06-26 20:27:24 +00001022 Src = Builder.CreateNSWAdd(Src, Adj, "adj");
Eli Friedmand8889622009-11-27 04:41:50 +00001023 }
Chris Lattnere70ffd62010-06-26 20:27:24 +00001024
Eli Friedmand8889622009-11-27 04:41:50 +00001025 return Src;
1026 }
1027
Eli Friedman8c3e7e72009-11-27 02:07:44 +00001028 case CastExpr::CK_ConstructorConversion:
Eli Friedmand8889622009-11-27 04:41:50 +00001029 assert(0 && "Should be unreachable!");
Eli Friedman8c3e7e72009-11-27 02:07:44 +00001030 break;
1031
Anders Carlsson7f9e6462009-09-15 04:48:33 +00001032 case CastExpr::CK_IntegralToPointer: {
1033 Value *Src = Visit(const_cast<Expr*>(E));
Anders Carlsson82debc72009-10-18 18:12:03 +00001034
1035 // First, convert to the correct width so that we control the kind of
1036 // extension.
Chris Lattner77b89b82010-06-27 07:15:29 +00001037 const llvm::Type *MiddleTy = CGF.IntPtrTy;
Anders Carlsson82debc72009-10-18 18:12:03 +00001038 bool InputSigned = E->getType()->isSignedIntegerType();
1039 llvm::Value* IntResult =
1040 Builder.CreateIntCast(Src, MiddleTy, InputSigned, "conv");
1041
1042 return Builder.CreateIntToPtr(IntResult, ConvertType(DestTy));
Anders Carlsson7f9e6462009-09-15 04:48:33 +00001043 }
Anders Carlsson7f9e6462009-09-15 04:48:33 +00001044 case CastExpr::CK_PointerToIntegral: {
1045 Value *Src = Visit(const_cast<Expr*>(E));
1046 return Builder.CreatePtrToInt(Src, ConvertType(DestTy));
1047 }
Eli Friedmanad35a832009-11-16 21:33:53 +00001048 case CastExpr::CK_ToVoid: {
Douglas Gregor569c3162010-08-07 11:51:51 +00001049 if (E->Classify(CGF.getContext()).isGLValue())
1050 CGF.EmitLValue(E);
1051 else
1052 CGF.EmitAnyExpr(E, 0, false, true);
Eli Friedmanad35a832009-11-16 21:33:53 +00001053 return 0;
1054 }
Eli Friedmanad35a832009-11-16 21:33:53 +00001055 case CastExpr::CK_VectorSplat: {
1056 const llvm::Type *DstTy = ConvertType(DestTy);
1057 Value *Elt = Visit(const_cast<Expr*>(E));
1058
1059 // Insert the element in element zero of an undef vector
1060 llvm::Value *UnV = llvm::UndefValue::get(DstTy);
Chris Lattner77b89b82010-06-27 07:15:29 +00001061 llvm::Value *Idx = llvm::ConstantInt::get(CGF.Int32Ty, 0);
Eli Friedmanad35a832009-11-16 21:33:53 +00001062 UnV = Builder.CreateInsertElement(UnV, Elt, Idx, "tmp");
1063
1064 // Splat the element across to all elements
1065 llvm::SmallVector<llvm::Constant*, 16> Args;
1066 unsigned NumElements = cast<llvm::VectorType>(DstTy)->getNumElements();
1067 for (unsigned i = 0; i < NumElements; i++)
Chris Lattner77b89b82010-06-27 07:15:29 +00001068 Args.push_back(llvm::ConstantInt::get(CGF.Int32Ty, 0));
Eli Friedmanad35a832009-11-16 21:33:53 +00001069
1070 llvm::Constant *Mask = llvm::ConstantVector::get(&Args[0], NumElements);
1071 llvm::Value *Yay = Builder.CreateShuffleVector(UnV, UnV, Mask, "splat");
1072 return Yay;
1073 }
Eli Friedman8c3e7e72009-11-27 02:07:44 +00001074 case CastExpr::CK_IntegralCast:
1075 case CastExpr::CK_IntegralToFloating:
1076 case CastExpr::CK_FloatingToIntegral:
1077 case CastExpr::CK_FloatingCast:
Eli Friedmand8889622009-11-27 04:41:50 +00001078 return EmitScalarConversion(Visit(E), E->getType(), DestTy);
Eli Friedmanad35a832009-11-16 21:33:53 +00001079
Eli Friedman3a173702009-12-11 09:26:29 +00001080 case CastExpr::CK_MemberPointerToBoolean:
1081 return CGF.EvaluateExprAsBool(E);
Anders Carlssone9776242009-08-24 18:26:39 +00001082 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001083
Chris Lattner58a2e942007-08-26 07:26:12 +00001084 // Handle cases where the source is an non-complex type.
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001085
Chris Lattner19a1d7c2008-02-16 23:55:16 +00001086 if (!CGF.hasAggregateLLVMType(E->getType())) {
Chris Lattner3707b252007-08-26 06:48:56 +00001087 Value *Src = Visit(const_cast<Expr*>(E));
1088
Chris Lattner3707b252007-08-26 06:48:56 +00001089 // Use EmitScalarConversion to perform the conversion.
1090 return EmitScalarConversion(Src, E->getType(), DestTy);
1091 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001092
Chris Lattner9b2dc282008-04-04 16:54:41 +00001093 if (E->getType()->isAnyComplexType()) {
Chris Lattner19a1d7c2008-02-16 23:55:16 +00001094 // Handle cases where the source is a complex type.
Mike Stump7f79f9b2009-05-29 15:46:01 +00001095 bool IgnoreImag = true;
1096 bool IgnoreImagAssign = true;
1097 bool IgnoreReal = IgnoreResultAssign;
1098 bool IgnoreRealAssign = IgnoreResultAssign;
1099 if (DestTy->isBooleanType())
1100 IgnoreImagAssign = IgnoreImag = false;
1101 else if (DestTy->isVoidType()) {
1102 IgnoreReal = IgnoreImag = false;
1103 IgnoreRealAssign = IgnoreImagAssign = true;
1104 }
1105 CodeGenFunction::ComplexPairTy V
1106 = CGF.EmitComplexExpr(E, IgnoreReal, IgnoreImag, IgnoreRealAssign,
1107 IgnoreImagAssign);
1108 return EmitComplexToScalarConversion(V, E->getType(), DestTy);
Chris Lattner19a1d7c2008-02-16 23:55:16 +00001109 }
Chris Lattner10b00cf2007-08-26 07:16:41 +00001110
Chris Lattner19a1d7c2008-02-16 23:55:16 +00001111 // Okay, this is a cast from an aggregate. It must be a cast to void. Just
1112 // evaluate the result and return.
Mike Stump7f79f9b2009-05-29 15:46:01 +00001113 CGF.EmitAggExpr(E, 0, false, true);
Chris Lattner19a1d7c2008-02-16 23:55:16 +00001114 return 0;
Chris Lattner7f02f722007-08-24 05:35:26 +00001115}
1116
Chris Lattner33793202007-08-31 22:09:40 +00001117Value *ScalarExprEmitter::VisitStmtExpr(const StmtExpr *E) {
Chris Lattner91d723d2008-07-26 20:23:23 +00001118 return CGF.EmitCompoundStmt(*E->getSubStmt(),
1119 !E->getType()->isVoidType()).getScalarVal();
Chris Lattner33793202007-08-31 22:09:40 +00001120}
1121
Mike Stumpa99038c2009-02-28 09:07:16 +00001122Value *ScalarExprEmitter::VisitBlockDeclRefExpr(const BlockDeclRefExpr *E) {
Fariborz Jahanianf7bcc7e2009-10-10 20:07:56 +00001123 llvm::Value *V = CGF.GetAddrOfBlockDecl(E);
1124 if (E->getType().isObjCGCWeak())
1125 return CGF.CGM.getObjCRuntime().EmitObjCWeakRead(CGF, V);
Daniel Dunbar2da84ff2009-11-29 21:23:36 +00001126 return Builder.CreateLoad(V, "tmp");
Mike Stump4e7a1f72009-02-21 20:00:35 +00001127}
Chris Lattner33793202007-08-31 22:09:40 +00001128
Chris Lattner7f02f722007-08-24 05:35:26 +00001129//===----------------------------------------------------------------------===//
1130// Unary Operators
1131//===----------------------------------------------------------------------===//
1132
Chris Lattner8c11a652010-06-26 22:09:34 +00001133llvm::Value *ScalarExprEmitter::
1134EmitScalarPrePostIncDec(const UnaryOperator *E, LValue LV,
1135 bool isInc, bool isPre) {
1136
1137 QualType ValTy = E->getSubExpr()->getType();
1138 llvm::Value *InVal = EmitLoadOfLValue(LV, ValTy);
1139
1140 int AmountVal = isInc ? 1 : -1;
1141
1142 if (ValTy->isPointerType() &&
1143 ValTy->getAs<PointerType>()->isVariableArrayType()) {
1144 // The amount of the addition/subtraction needs to account for the VLA size
1145 CGF.ErrorUnsupported(E, "VLA pointer inc/dec");
1146 }
1147
1148 llvm::Value *NextVal;
1149 if (const llvm::PointerType *PT =
1150 dyn_cast<llvm::PointerType>(InVal->getType())) {
Chris Lattner77b89b82010-06-27 07:15:29 +00001151 llvm::Constant *Inc = llvm::ConstantInt::get(CGF.Int32Ty, AmountVal);
Chris Lattner8c11a652010-06-26 22:09:34 +00001152 if (!isa<llvm::FunctionType>(PT->getElementType())) {
1153 QualType PTEE = ValTy->getPointeeType();
1154 if (const ObjCObjectType *OIT = PTEE->getAs<ObjCObjectType>()) {
1155 // Handle interface types, which are not represented with a concrete
1156 // type.
1157 int size = CGF.getContext().getTypeSize(OIT) / 8;
1158 if (!isInc)
1159 size = -size;
1160 Inc = llvm::ConstantInt::get(Inc->getType(), size);
1161 const llvm::Type *i8Ty = llvm::Type::getInt8PtrTy(VMContext);
1162 InVal = Builder.CreateBitCast(InVal, i8Ty);
1163 NextVal = Builder.CreateGEP(InVal, Inc, "add.ptr");
1164 llvm::Value *lhs = LV.getAddress();
1165 lhs = Builder.CreateBitCast(lhs, llvm::PointerType::getUnqual(i8Ty));
1166 LV = LValue::MakeAddr(lhs, CGF.MakeQualifiers(ValTy));
1167 } else
1168 NextVal = Builder.CreateInBoundsGEP(InVal, Inc, "ptrincdec");
1169 } else {
1170 const llvm::Type *i8Ty = llvm::Type::getInt8PtrTy(VMContext);
1171 NextVal = Builder.CreateBitCast(InVal, i8Ty, "tmp");
1172 NextVal = Builder.CreateGEP(NextVal, Inc, "ptrincdec");
1173 NextVal = Builder.CreateBitCast(NextVal, InVal->getType());
1174 }
1175 } else if (InVal->getType()->isIntegerTy(1) && isInc) {
1176 // Bool++ is an interesting case, due to promotion rules, we get:
1177 // Bool++ -> Bool = Bool+1 -> Bool = (int)Bool+1 ->
1178 // Bool = ((int)Bool+1) != 0
1179 // An interesting aspect of this is that increment is always true.
1180 // Decrement does not have this property.
1181 NextVal = llvm::ConstantInt::getTrue(VMContext);
1182 } else if (isa<llvm::IntegerType>(InVal->getType())) {
1183 NextVal = llvm::ConstantInt::get(InVal->getType(), AmountVal);
1184
Chris Lattner640d3262010-06-26 22:18:28 +00001185 if (!ValTy->isSignedIntegerType())
1186 // Unsigned integer inc is always two's complement.
Chris Lattner8c11a652010-06-26 22:09:34 +00001187 NextVal = Builder.CreateAdd(InVal, NextVal, isInc ? "inc" : "dec");
Chris Lattner640d3262010-06-26 22:18:28 +00001188 else {
1189 switch (CGF.getContext().getLangOptions().getSignedOverflowBehavior()) {
1190 case LangOptions::SOB_Undefined:
1191 NextVal = Builder.CreateNSWAdd(InVal, NextVal, isInc ? "inc" : "dec");
1192 break;
1193 case LangOptions::SOB_Defined:
1194 NextVal = Builder.CreateAdd(InVal, NextVal, isInc ? "inc" : "dec");
1195 break;
1196 case LangOptions::SOB_Trapping:
1197 BinOpInfo BinOp;
1198 BinOp.LHS = InVal;
1199 BinOp.RHS = NextVal;
1200 BinOp.Ty = E->getType();
1201 BinOp.Opcode = BinaryOperator::Add;
1202 BinOp.E = E;
John McCall401be6b2010-08-05 17:39:44 +00001203 NextVal = EmitOverflowCheckedBinOp(BinOp);
1204 break;
Chris Lattner640d3262010-06-26 22:18:28 +00001205 }
1206 }
Chris Lattner8c11a652010-06-26 22:09:34 +00001207 } else {
1208 // Add the inc/dec to the real part.
1209 if (InVal->getType()->isFloatTy())
1210 NextVal =
1211 llvm::ConstantFP::get(VMContext,
1212 llvm::APFloat(static_cast<float>(AmountVal)));
1213 else if (InVal->getType()->isDoubleTy())
1214 NextVal =
1215 llvm::ConstantFP::get(VMContext,
1216 llvm::APFloat(static_cast<double>(AmountVal)));
1217 else {
1218 llvm::APFloat F(static_cast<float>(AmountVal));
1219 bool ignored;
1220 F.convert(CGF.Target.getLongDoubleFormat(), llvm::APFloat::rmTowardZero,
1221 &ignored);
1222 NextVal = llvm::ConstantFP::get(VMContext, F);
1223 }
1224 NextVal = Builder.CreateFAdd(InVal, NextVal, isInc ? "inc" : "dec");
1225 }
1226
1227 // Store the updated result through the lvalue.
1228 if (LV.isBitField())
1229 CGF.EmitStoreThroughBitfieldLValue(RValue::get(NextVal), LV, ValTy, &NextVal);
1230 else
1231 CGF.EmitStoreThroughLValue(RValue::get(NextVal), LV, ValTy);
1232
1233 // If this is a postinc, return the value read from memory, otherwise use the
1234 // updated value.
1235 return isPre ? NextVal : InVal;
1236}
1237
1238
1239
Chris Lattner7f02f722007-08-24 05:35:26 +00001240Value *ScalarExprEmitter::VisitUnaryMinus(const UnaryOperator *E) {
Mike Stump7f79f9b2009-05-29 15:46:01 +00001241 TestAndClearIgnoreResultAssign();
Chris Lattner9a207232010-06-26 21:48:21 +00001242 // Emit unary minus with EmitSub so we handle overflow cases etc.
1243 BinOpInfo BinOp;
Chris Lattner4ac0d832010-06-28 17:12:37 +00001244 BinOp.RHS = Visit(E->getSubExpr());
1245
1246 if (BinOp.RHS->getType()->isFPOrFPVectorTy())
1247 BinOp.LHS = llvm::ConstantFP::getZeroValueForNegation(BinOp.RHS->getType());
1248 else
1249 BinOp.LHS = llvm::Constant::getNullValue(BinOp.RHS->getType());
Chris Lattner9a207232010-06-26 21:48:21 +00001250 BinOp.Ty = E->getType();
1251 BinOp.Opcode = BinaryOperator::Sub;
1252 BinOp.E = E;
1253 return EmitSub(BinOp);
Chris Lattner7f02f722007-08-24 05:35:26 +00001254}
1255
1256Value *ScalarExprEmitter::VisitUnaryNot(const UnaryOperator *E) {
Mike Stump7f79f9b2009-05-29 15:46:01 +00001257 TestAndClearIgnoreResultAssign();
Chris Lattner7f02f722007-08-24 05:35:26 +00001258 Value *Op = Visit(E->getSubExpr());
1259 return Builder.CreateNot(Op, "neg");
1260}
1261
1262Value *ScalarExprEmitter::VisitUnaryLNot(const UnaryOperator *E) {
1263 // Compare operand to zero.
1264 Value *BoolVal = CGF.EvaluateExprAsBool(E->getSubExpr());
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001265
Chris Lattner7f02f722007-08-24 05:35:26 +00001266 // Invert value.
1267 // TODO: Could dynamically modify easy computations here. For example, if
1268 // the operand is an icmp ne, turn into icmp eq.
1269 BoolVal = Builder.CreateNot(BoolVal, "lnot");
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001270
Anders Carlsson9f84d882009-05-19 18:44:53 +00001271 // ZExt result to the expr type.
1272 return Builder.CreateZExt(BoolVal, ConvertType(E->getType()), "lnot.ext");
Chris Lattner7f02f722007-08-24 05:35:26 +00001273}
1274
Eli Friedman0027d2b2010-08-05 09:58:49 +00001275Value *ScalarExprEmitter::VisitOffsetOfExpr(OffsetOfExpr *E) {
1276 // Try folding the offsetof to a constant.
1277 Expr::EvalResult EvalResult;
1278 if (E->Evaluate(EvalResult, CGF.getContext()))
1279 return llvm::ConstantInt::get(VMContext, EvalResult.Val.getInt());
1280
1281 // Loop over the components of the offsetof to compute the value.
1282 unsigned n = E->getNumComponents();
1283 const llvm::Type* ResultType = ConvertType(E->getType());
1284 llvm::Value* Result = llvm::Constant::getNullValue(ResultType);
1285 QualType CurrentType = E->getTypeSourceInfo()->getType();
1286 for (unsigned i = 0; i != n; ++i) {
1287 OffsetOfExpr::OffsetOfNode ON = E->getComponent(i);
Eli Friedman16fd39f2010-08-06 16:37:05 +00001288 llvm::Value *Offset = 0;
Eli Friedman0027d2b2010-08-05 09:58:49 +00001289 switch (ON.getKind()) {
1290 case OffsetOfExpr::OffsetOfNode::Array: {
1291 // Compute the index
1292 Expr *IdxExpr = E->getIndexExpr(ON.getArrayExprIndex());
1293 llvm::Value* Idx = CGF.EmitScalarExpr(IdxExpr);
1294 bool IdxSigned = IdxExpr->getType()->isSignedIntegerType();
1295 Idx = Builder.CreateIntCast(Idx, ResultType, IdxSigned, "conv");
1296
1297 // Save the element type
1298 CurrentType =
1299 CGF.getContext().getAsArrayType(CurrentType)->getElementType();
1300
1301 // Compute the element size
1302 llvm::Value* ElemSize = llvm::ConstantInt::get(ResultType,
1303 CGF.getContext().getTypeSizeInChars(CurrentType).getQuantity());
1304
1305 // Multiply out to compute the result
1306 Offset = Builder.CreateMul(Idx, ElemSize);
1307 break;
1308 }
1309
1310 case OffsetOfExpr::OffsetOfNode::Field: {
1311 FieldDecl *MemberDecl = ON.getField();
1312 RecordDecl *RD = CurrentType->getAs<RecordType>()->getDecl();
1313 const ASTRecordLayout &RL = CGF.getContext().getASTRecordLayout(RD);
1314
1315 // Compute the index of the field in its parent.
1316 unsigned i = 0;
1317 // FIXME: It would be nice if we didn't have to loop here!
1318 for (RecordDecl::field_iterator Field = RD->field_begin(),
1319 FieldEnd = RD->field_end();
1320 Field != FieldEnd; (void)++Field, ++i) {
1321 if (*Field == MemberDecl)
1322 break;
1323 }
1324 assert(i < RL.getFieldCount() && "offsetof field in wrong type");
1325
1326 // Compute the offset to the field
1327 int64_t OffsetInt = RL.getFieldOffset(i) /
1328 CGF.getContext().getCharWidth();
1329 Offset = llvm::ConstantInt::get(ResultType, OffsetInt);
1330
1331 // Save the element type.
1332 CurrentType = MemberDecl->getType();
1333 break;
1334 }
Eli Friedman16fd39f2010-08-06 16:37:05 +00001335
Eli Friedman0027d2b2010-08-05 09:58:49 +00001336 case OffsetOfExpr::OffsetOfNode::Identifier:
Eli Friedman6d4e44b2010-08-06 01:17:25 +00001337 llvm_unreachable("dependent __builtin_offsetof");
Eli Friedman16fd39f2010-08-06 16:37:05 +00001338
Eli Friedman0027d2b2010-08-05 09:58:49 +00001339 case OffsetOfExpr::OffsetOfNode::Base: {
1340 if (ON.getBase()->isVirtual()) {
1341 CGF.ErrorUnsupported(E, "virtual base in offsetof");
1342 continue;
1343 }
1344
1345 RecordDecl *RD = CurrentType->getAs<RecordType>()->getDecl();
1346 const ASTRecordLayout &RL = CGF.getContext().getASTRecordLayout(RD);
1347
1348 // Save the element type.
1349 CurrentType = ON.getBase()->getType();
1350
1351 // Compute the offset to the base.
1352 const RecordType *BaseRT = CurrentType->getAs<RecordType>();
1353 CXXRecordDecl *BaseRD = cast<CXXRecordDecl>(BaseRT->getDecl());
1354 int64_t OffsetInt = RL.getBaseClassOffset(BaseRD) /
1355 CGF.getContext().getCharWidth();
1356 Offset = llvm::ConstantInt::get(ResultType, OffsetInt);
1357 break;
1358 }
1359 }
1360 Result = Builder.CreateAdd(Result, Offset);
1361 }
1362 return Result;
Douglas Gregor8ecdb652010-04-28 22:16:22 +00001363}
1364
Sebastian Redl05189992008-11-11 17:56:53 +00001365/// VisitSizeOfAlignOfExpr - Return the size or alignment of the type of
1366/// argument of the sizeof expression as an integer.
1367Value *
1368ScalarExprEmitter::VisitSizeOfAlignOfExpr(const SizeOfAlignOfExpr *E) {
Sebastian Redl05189992008-11-11 17:56:53 +00001369 QualType TypeToSize = E->getTypeOfArgument();
Eli Friedmanf2da9df2009-01-24 22:19:05 +00001370 if (E->isSizeOf()) {
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001371 if (const VariableArrayType *VAT =
Eli Friedmanf2da9df2009-01-24 22:19:05 +00001372 CGF.getContext().getAsVariableArrayType(TypeToSize)) {
1373 if (E->isArgumentType()) {
1374 // sizeof(type) - make sure to emit the VLA size.
1375 CGF.EmitVLASize(TypeToSize);
Eli Friedman8f426fa2009-04-20 03:21:44 +00001376 } else {
1377 // C99 6.5.3.4p2: If the argument is an expression of type
1378 // VLA, it is evaluated.
1379 CGF.EmitAnyExpr(E->getArgumentExpr());
Eli Friedmanf2da9df2009-01-24 22:19:05 +00001380 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001381
Anders Carlsson96f21472009-02-05 19:43:10 +00001382 return CGF.GetVLASize(VAT);
Anders Carlssonb50525b2008-12-21 03:33:21 +00001383 }
Anders Carlsson5d463152008-12-12 07:38:43 +00001384 }
Eli Friedmanf2da9df2009-01-24 22:19:05 +00001385
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001386 // If this isn't sizeof(vla), the result must be constant; use the constant
1387 // folding logic so we don't have to duplicate it here.
Eli Friedmanf2da9df2009-01-24 22:19:05 +00001388 Expr::EvalResult Result;
1389 E->Evaluate(Result, CGF.getContext());
Owen Anderson4a28d5d2009-07-24 23:12:58 +00001390 return llvm::ConstantInt::get(VMContext, Result.Val.getInt());
Chris Lattner7f02f722007-08-24 05:35:26 +00001391}
1392
Chris Lattner46f93d02007-08-24 21:20:17 +00001393Value *ScalarExprEmitter::VisitUnaryReal(const UnaryOperator *E) {
1394 Expr *Op = E->getSubExpr();
Chris Lattner9b2dc282008-04-04 16:54:41 +00001395 if (Op->getType()->isAnyComplexType())
Mike Stump7f79f9b2009-05-29 15:46:01 +00001396 return CGF.EmitComplexExpr(Op, false, true, false, true).first;
Chris Lattner46f93d02007-08-24 21:20:17 +00001397 return Visit(Op);
1398}
1399Value *ScalarExprEmitter::VisitUnaryImag(const UnaryOperator *E) {
1400 Expr *Op = E->getSubExpr();
Chris Lattner9b2dc282008-04-04 16:54:41 +00001401 if (Op->getType()->isAnyComplexType())
Mike Stump7f79f9b2009-05-29 15:46:01 +00001402 return CGF.EmitComplexExpr(Op, true, false, true, false).second;
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001403
Mike Stump7f79f9b2009-05-29 15:46:01 +00001404 // __imag on a scalar returns zero. Emit the subexpr to ensure side
1405 // effects are evaluated, but not the actual value.
1406 if (E->isLvalue(CGF.getContext()) == Expr::LV_Valid)
1407 CGF.EmitLValue(Op);
1408 else
1409 CGF.EmitScalarExpr(Op, true);
Owen Andersonc9c88b42009-07-31 20:28:54 +00001410 return llvm::Constant::getNullValue(ConvertType(E->getType()));
Chris Lattner46f93d02007-08-24 21:20:17 +00001411}
1412
Mike Stump1eb44332009-09-09 15:08:12 +00001413Value *ScalarExprEmitter::VisitUnaryOffsetOf(const UnaryOperator *E) {
Eli Friedman35183ac2009-02-27 06:44:11 +00001414 Value* ResultAsPtr = EmitLValue(E->getSubExpr()).getAddress();
Eli Friedman769e4112009-01-24 22:38:55 +00001415 const llvm::Type* ResultType = ConvertType(E->getType());
Eli Friedman35183ac2009-02-27 06:44:11 +00001416 return Builder.CreatePtrToInt(ResultAsPtr, ResultType, "offsetof");
Anders Carlsson5a1deb82008-01-29 15:56:48 +00001417}
Chris Lattner46f93d02007-08-24 21:20:17 +00001418
Chris Lattner7f02f722007-08-24 05:35:26 +00001419//===----------------------------------------------------------------------===//
1420// Binary Operators
1421//===----------------------------------------------------------------------===//
1422
1423BinOpInfo ScalarExprEmitter::EmitBinOps(const BinaryOperator *E) {
Mike Stump7f79f9b2009-05-29 15:46:01 +00001424 TestAndClearIgnoreResultAssign();
Chris Lattner7f02f722007-08-24 05:35:26 +00001425 BinOpInfo Result;
1426 Result.LHS = Visit(E->getLHS());
1427 Result.RHS = Visit(E->getRHS());
Chris Lattner1f1ded92007-08-24 21:00:35 +00001428 Result.Ty = E->getType();
Chris Lattner9a207232010-06-26 21:48:21 +00001429 Result.Opcode = E->getOpcode();
Chris Lattner7f02f722007-08-24 05:35:26 +00001430 Result.E = E;
1431 return Result;
1432}
1433
Douglas Gregor6a03e342010-04-23 04:16:32 +00001434LValue ScalarExprEmitter::EmitCompoundAssignLValue(
1435 const CompoundAssignOperator *E,
1436 Value *(ScalarExprEmitter::*Func)(const BinOpInfo &),
Daniel Dunbard7f7d082010-06-29 22:00:45 +00001437 Value *&Result) {
Benjamin Kramer54d76db2009-12-25 15:43:36 +00001438 QualType LHSTy = E->getLHS()->getType();
Chris Lattner1f1ded92007-08-24 21:00:35 +00001439 BinOpInfo OpInfo;
Douglas Gregor6a03e342010-04-23 04:16:32 +00001440
Eli Friedmanab3a8522009-03-28 01:22:36 +00001441 if (E->getComputationResultType()->isAnyComplexType()) {
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001442 // This needs to go through the complex expression emitter, but it's a tad
1443 // complicated to do that... I'm leaving it out for now. (Note that we do
1444 // actually need the imaginary part of the RHS for multiplication and
1445 // division.)
Eli Friedmanab3a8522009-03-28 01:22:36 +00001446 CGF.ErrorUnsupported(E, "complex compound assignment");
Daniel Dunbard7f7d082010-06-29 22:00:45 +00001447 Result = llvm::UndefValue::get(CGF.ConvertType(E->getType()));
Douglas Gregor6a03e342010-04-23 04:16:32 +00001448 return LValue();
Eli Friedmanab3a8522009-03-28 01:22:36 +00001449 }
Douglas Gregor6a03e342010-04-23 04:16:32 +00001450
Mike Stumpcc0442f2009-05-22 19:07:20 +00001451 // Emit the RHS first. __block variables need to have the rhs evaluated
1452 // first, plus this should improve codegen a little.
1453 OpInfo.RHS = Visit(E->getRHS());
1454 OpInfo.Ty = E->getComputationResultType();
Chris Lattner9a207232010-06-26 21:48:21 +00001455 OpInfo.Opcode = E->getOpcode();
Mike Stumpcc0442f2009-05-22 19:07:20 +00001456 OpInfo.E = E;
Eli Friedmanab3a8522009-03-28 01:22:36 +00001457 // Load/convert the LHS.
Mike Stumpb14e62d2009-12-16 02:57:00 +00001458 LValue LHSLV = EmitCheckedLValue(E->getLHS());
Chris Lattner1f1ded92007-08-24 21:00:35 +00001459 OpInfo.LHS = EmitLoadOfLValue(LHSLV, LHSTy);
Eli Friedmanab3a8522009-03-28 01:22:36 +00001460 OpInfo.LHS = EmitScalarConversion(OpInfo.LHS, LHSTy,
1461 E->getComputationLHSType());
Douglas Gregor6a03e342010-04-23 04:16:32 +00001462
Chris Lattner1f1ded92007-08-24 21:00:35 +00001463 // Expand the binary operator.
Daniel Dunbard7f7d082010-06-29 22:00:45 +00001464 Result = (this->*Func)(OpInfo);
Douglas Gregor6a03e342010-04-23 04:16:32 +00001465
Daniel Dunbar8c6f57c2008-08-06 02:00:38 +00001466 // Convert the result back to the LHS type.
Eli Friedmanab3a8522009-03-28 01:22:36 +00001467 Result = EmitScalarConversion(Result, E->getComputationResultType(), LHSTy);
Douglas Gregor6a03e342010-04-23 04:16:32 +00001468
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001469 // Store the result value into the LHS lvalue. Bit-fields are handled
1470 // specially because the result is altered by the store, i.e., [C99 6.5.16p1]
1471 // 'An assignment expression has the value of the left operand after the
1472 // assignment...'.
Daniel Dunbard7f7d082010-06-29 22:00:45 +00001473 if (LHSLV.isBitField())
1474 CGF.EmitStoreThroughBitfieldLValue(RValue::get(Result), LHSLV, LHSTy,
1475 &Result);
1476 else
Daniel Dunbared3849b2008-11-19 09:36:46 +00001477 CGF.EmitStoreThroughLValue(RValue::get(Result), LHSLV, LHSTy);
Daniel Dunbard7f7d082010-06-29 22:00:45 +00001478
Douglas Gregor6a03e342010-04-23 04:16:32 +00001479 return LHSLV;
1480}
1481
1482Value *ScalarExprEmitter::EmitCompoundAssign(const CompoundAssignOperator *E,
1483 Value *(ScalarExprEmitter::*Func)(const BinOpInfo &)) {
1484 bool Ignore = TestAndClearIgnoreResultAssign();
Daniel Dunbard7f7d082010-06-29 22:00:45 +00001485 Value *RHS;
1486 LValue LHS = EmitCompoundAssignLValue(E, Func, RHS);
1487
1488 // If the result is clearly ignored, return now.
Mike Stump7f79f9b2009-05-29 15:46:01 +00001489 if (Ignore)
1490 return 0;
Daniel Dunbard7f7d082010-06-29 22:00:45 +00001491
1492 // Objective-C property assignment never reloads the value following a store.
1493 if (LHS.isPropertyRef() || LHS.isKVCRef())
1494 return RHS;
1495
1496 // If the lvalue is non-volatile, return the computed value of the assignment.
1497 if (!LHS.isVolatileQualified())
1498 return RHS;
1499
1500 // Otherwise, reload the value.
1501 return EmitLoadOfLValue(LHS, E->getType());
Chris Lattner1f1ded92007-08-24 21:00:35 +00001502}
1503
1504
Chris Lattner7f02f722007-08-24 05:35:26 +00001505Value *ScalarExprEmitter::EmitDiv(const BinOpInfo &Ops) {
Duncan Sandsf177d9d2010-02-15 16:14:01 +00001506 if (Ops.LHS->getType()->isFPOrFPVectorTy())
Chris Lattner7f02f722007-08-24 05:35:26 +00001507 return Builder.CreateFDiv(Ops.LHS, Ops.RHS, "div");
Douglas Gregorf6094622010-07-23 15:58:24 +00001508 else if (Ops.Ty->hasUnsignedIntegerRepresentation())
Chris Lattner7f02f722007-08-24 05:35:26 +00001509 return Builder.CreateUDiv(Ops.LHS, Ops.RHS, "div");
1510 else
1511 return Builder.CreateSDiv(Ops.LHS, Ops.RHS, "div");
1512}
1513
1514Value *ScalarExprEmitter::EmitRem(const BinOpInfo &Ops) {
1515 // Rem in C can't be a floating point type: C99 6.5.5p2.
Chris Lattner1f1ded92007-08-24 21:00:35 +00001516 if (Ops.Ty->isUnsignedIntegerType())
Chris Lattner7f02f722007-08-24 05:35:26 +00001517 return Builder.CreateURem(Ops.LHS, Ops.RHS, "rem");
1518 else
1519 return Builder.CreateSRem(Ops.LHS, Ops.RHS, "rem");
1520}
1521
Mike Stump2add4732009-04-01 20:28:16 +00001522Value *ScalarExprEmitter::EmitOverflowCheckedBinOp(const BinOpInfo &Ops) {
1523 unsigned IID;
1524 unsigned OpID = 0;
Mike Stump5d8b2cf2009-04-02 01:03:55 +00001525
Chris Lattner9a207232010-06-26 21:48:21 +00001526 switch (Ops.Opcode) {
Mike Stump035cf892009-04-02 18:15:54 +00001527 case BinaryOperator::Add:
1528 case BinaryOperator::AddAssign:
1529 OpID = 1;
1530 IID = llvm::Intrinsic::sadd_with_overflow;
1531 break;
1532 case BinaryOperator::Sub:
1533 case BinaryOperator::SubAssign:
1534 OpID = 2;
1535 IID = llvm::Intrinsic::ssub_with_overflow;
1536 break;
1537 case BinaryOperator::Mul:
1538 case BinaryOperator::MulAssign:
1539 OpID = 3;
1540 IID = llvm::Intrinsic::smul_with_overflow;
1541 break;
1542 default:
1543 assert(false && "Unsupported operation for overflow detection");
Daniel Dunbarab4eff62009-04-08 16:23:09 +00001544 IID = 0;
Mike Stump2add4732009-04-01 20:28:16 +00001545 }
Mike Stump035cf892009-04-02 18:15:54 +00001546 OpID <<= 1;
1547 OpID |= 1;
1548
Mike Stump2add4732009-04-01 20:28:16 +00001549 const llvm::Type *opTy = CGF.CGM.getTypes().ConvertType(Ops.Ty);
1550
1551 llvm::Function *intrinsic = CGF.CGM.getIntrinsic(IID, &opTy, 1);
1552
1553 Value *resultAndOverflow = Builder.CreateCall2(intrinsic, Ops.LHS, Ops.RHS);
1554 Value *result = Builder.CreateExtractValue(resultAndOverflow, 0);
1555 Value *overflow = Builder.CreateExtractValue(resultAndOverflow, 1);
1556
1557 // Branch in case of overflow.
Chris Lattner93a00352010-08-07 00:20:46 +00001558 llvm::BasicBlock *overflowBB = CGF.createBasicBlock("overflow", CGF.CurFn);
1559 llvm::BasicBlock *continueBB = CGF.createBasicBlock("nooverflow", CGF.CurFn);
Mike Stump2add4732009-04-01 20:28:16 +00001560
1561 Builder.CreateCondBr(overflow, overflowBB, continueBB);
1562
Chris Lattner93a00352010-08-07 00:20:46 +00001563 // Handle overflow with llvm.trap.
1564 // TODO: it would be better to generate one of these blocks per function.
Mike Stump2add4732009-04-01 20:28:16 +00001565 Builder.SetInsertPoint(overflowBB);
Chris Lattner93a00352010-08-07 00:20:46 +00001566 llvm::Function *Trap = CGF.CGM.getIntrinsic(llvm::Intrinsic::trap);
1567 Builder.CreateCall(Trap);
1568 Builder.CreateUnreachable();
1569
1570 // Continue on.
Mike Stump2add4732009-04-01 20:28:16 +00001571 Builder.SetInsertPoint(continueBB);
Chris Lattner93a00352010-08-07 00:20:46 +00001572 return result;
Mike Stump2add4732009-04-01 20:28:16 +00001573}
Chris Lattner7f02f722007-08-24 05:35:26 +00001574
1575Value *ScalarExprEmitter::EmitAdd(const BinOpInfo &Ops) {
Steve Naroff58f9f2c2009-07-14 18:25:06 +00001576 if (!Ops.Ty->isAnyPointerType()) {
Douglas Gregorf6094622010-07-23 15:58:24 +00001577 if (Ops.Ty->hasSignedIntegerRepresentation()) {
Chris Lattnera4d71452010-06-26 21:25:03 +00001578 switch (CGF.getContext().getLangOptions().getSignedOverflowBehavior()) {
1579 case LangOptions::SOB_Undefined:
1580 return Builder.CreateNSWAdd(Ops.LHS, Ops.RHS, "add");
1581 case LangOptions::SOB_Defined:
1582 return Builder.CreateAdd(Ops.LHS, Ops.RHS, "add");
1583 case LangOptions::SOB_Trapping:
1584 return EmitOverflowCheckedBinOp(Ops);
1585 }
1586 }
1587
Duncan Sandsf177d9d2010-02-15 16:14:01 +00001588 if (Ops.LHS->getType()->isFPOrFPVectorTy())
Chris Lattner87415d22009-06-17 06:36:24 +00001589 return Builder.CreateFAdd(Ops.LHS, Ops.RHS, "add");
Dan Gohmanbf933a02009-08-12 01:16:29 +00001590
Chris Lattner7f02f722007-08-24 05:35:26 +00001591 return Builder.CreateAdd(Ops.LHS, Ops.RHS, "add");
Mike Stump2add4732009-04-01 20:28:16 +00001592 }
Eli Friedmandaa24a22009-03-28 02:45:41 +00001593
Chris Lattner7f215c12010-06-26 21:52:32 +00001594 // Must have binary (not unary) expr here. Unary pointer decrement doesn't
Chris Lattner9a207232010-06-26 21:48:21 +00001595 // use this path.
1596 const BinaryOperator *BinOp = cast<BinaryOperator>(Ops.E);
1597
Steve Naroff14108da2009-07-10 23:34:53 +00001598 if (Ops.Ty->isPointerType() &&
Ted Kremenek6217b802009-07-29 21:53:49 +00001599 Ops.Ty->getAs<PointerType>()->isVariableArrayType()) {
Eli Friedmandaa24a22009-03-28 02:45:41 +00001600 // The amount of the addition needs to account for the VLA size
Chris Lattner9a207232010-06-26 21:48:21 +00001601 CGF.ErrorUnsupported(BinOp, "VLA pointer addition");
Eli Friedmandaa24a22009-03-28 02:45:41 +00001602 }
Chris Lattner9a207232010-06-26 21:48:21 +00001603
Chris Lattner8f925282008-01-03 06:36:51 +00001604 Value *Ptr, *Idx;
1605 Expr *IdxExp;
Chris Lattner9a207232010-06-26 21:48:21 +00001606 const PointerType *PT = BinOp->getLHS()->getType()->getAs<PointerType>();
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001607 const ObjCObjectPointerType *OPT =
Chris Lattner9a207232010-06-26 21:48:21 +00001608 BinOp->getLHS()->getType()->getAs<ObjCObjectPointerType>();
Steve Naroff14108da2009-07-10 23:34:53 +00001609 if (PT || OPT) {
Chris Lattner8f925282008-01-03 06:36:51 +00001610 Ptr = Ops.LHS;
1611 Idx = Ops.RHS;
Chris Lattner9a207232010-06-26 21:48:21 +00001612 IdxExp = BinOp->getRHS();
Steve Naroff14108da2009-07-10 23:34:53 +00001613 } else { // int + pointer
Chris Lattner9a207232010-06-26 21:48:21 +00001614 PT = BinOp->getRHS()->getType()->getAs<PointerType>();
1615 OPT = BinOp->getRHS()->getType()->getAs<ObjCObjectPointerType>();
Steve Naroff14108da2009-07-10 23:34:53 +00001616 assert((PT || OPT) && "Invalid add expr");
Chris Lattner8f925282008-01-03 06:36:51 +00001617 Ptr = Ops.RHS;
1618 Idx = Ops.LHS;
Chris Lattner9a207232010-06-26 21:48:21 +00001619 IdxExp = BinOp->getLHS();
Chris Lattner8f925282008-01-03 06:36:51 +00001620 }
1621
1622 unsigned Width = cast<llvm::IntegerType>(Idx->getType())->getBitWidth();
Sanjiv Gupta7cabee52009-04-24 02:40:57 +00001623 if (Width < CGF.LLVMPointerWidth) {
Chris Lattner8f925282008-01-03 06:36:51 +00001624 // Zero or sign extend the pointer value based on whether the index is
1625 // signed or not.
Chris Lattner77b89b82010-06-27 07:15:29 +00001626 const llvm::Type *IdxType = CGF.IntPtrTy;
Chris Lattner96196622008-07-26 22:37:01 +00001627 if (IdxExp->getType()->isSignedIntegerType())
Chris Lattner8f925282008-01-03 06:36:51 +00001628 Idx = Builder.CreateSExt(Idx, IdxType, "idx.ext");
1629 else
1630 Idx = Builder.CreateZExt(Idx, IdxType, "idx.ext");
1631 }
Steve Naroff14108da2009-07-10 23:34:53 +00001632 const QualType ElementType = PT ? PT->getPointeeType() : OPT->getPointeeType();
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001633 // Handle interface types, which are not represented with a concrete type.
John McCallc12c5bb2010-05-15 11:32:37 +00001634 if (const ObjCObjectType *OIT = ElementType->getAs<ObjCObjectType>()) {
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001635 llvm::Value *InterfaceSize =
Owen Anderson4a28d5d2009-07-24 23:12:58 +00001636 llvm::ConstantInt::get(Idx->getType(),
Ken Dyck199c3d62010-01-11 17:06:35 +00001637 CGF.getContext().getTypeSizeInChars(OIT).getQuantity());
Daniel Dunbar2a866252009-04-25 05:08:32 +00001638 Idx = Builder.CreateMul(Idx, InterfaceSize);
Benjamin Kramer3c0ef8c2009-10-13 10:07:13 +00001639 const llvm::Type *i8Ty = llvm::Type::getInt8PtrTy(VMContext);
Daniel Dunbar2a866252009-04-25 05:08:32 +00001640 Value *Casted = Builder.CreateBitCast(Ptr, i8Ty);
1641 Value *Res = Builder.CreateGEP(Casted, Idx, "add.ptr");
1642 return Builder.CreateBitCast(Res, Ptr->getType());
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001643 }
Daniel Dunbar2a866252009-04-25 05:08:32 +00001644
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001645 // Explicitly handle GNU void* and function pointer arithmetic extensions. The
1646 // GNU void* casts amount to no-ops since our void* type is i8*, but this is
1647 // future proof.
Daniel Dunbarb09fae72009-01-23 18:51:09 +00001648 if (ElementType->isVoidType() || ElementType->isFunctionType()) {
Benjamin Kramer3c0ef8c2009-10-13 10:07:13 +00001649 const llvm::Type *i8Ty = llvm::Type::getInt8PtrTy(VMContext);
Daniel Dunbarb09fae72009-01-23 18:51:09 +00001650 Value *Casted = Builder.CreateBitCast(Ptr, i8Ty);
Daniel Dunbar2a866252009-04-25 05:08:32 +00001651 Value *Res = Builder.CreateGEP(Casted, Idx, "add.ptr");
Daniel Dunbarb09fae72009-01-23 18:51:09 +00001652 return Builder.CreateBitCast(Res, Ptr->getType());
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001653 }
1654
Dan Gohman664f8932009-08-12 00:33:55 +00001655 return Builder.CreateInBoundsGEP(Ptr, Idx, "add.ptr");
Chris Lattner7f02f722007-08-24 05:35:26 +00001656}
1657
1658Value *ScalarExprEmitter::EmitSub(const BinOpInfo &Ops) {
Mike Stump2add4732009-04-01 20:28:16 +00001659 if (!isa<llvm::PointerType>(Ops.LHS->getType())) {
Douglas Gregorf6094622010-07-23 15:58:24 +00001660 if (Ops.Ty->hasSignedIntegerRepresentation()) {
Chris Lattnera4d71452010-06-26 21:25:03 +00001661 switch (CGF.getContext().getLangOptions().getSignedOverflowBehavior()) {
1662 case LangOptions::SOB_Undefined:
1663 return Builder.CreateNSWSub(Ops.LHS, Ops.RHS, "sub");
1664 case LangOptions::SOB_Defined:
1665 return Builder.CreateSub(Ops.LHS, Ops.RHS, "sub");
1666 case LangOptions::SOB_Trapping:
1667 return EmitOverflowCheckedBinOp(Ops);
1668 }
1669 }
1670
Duncan Sandsf177d9d2010-02-15 16:14:01 +00001671 if (Ops.LHS->getType()->isFPOrFPVectorTy())
Chris Lattner87415d22009-06-17 06:36:24 +00001672 return Builder.CreateFSub(Ops.LHS, Ops.RHS, "sub");
Chris Lattner2eb91e42010-03-29 17:28:16 +00001673
Chris Lattner7f02f722007-08-24 05:35:26 +00001674 return Builder.CreateSub(Ops.LHS, Ops.RHS, "sub");
Mike Stump2add4732009-04-01 20:28:16 +00001675 }
Chris Lattner1f1ded92007-08-24 21:00:35 +00001676
Chris Lattner9a207232010-06-26 21:48:21 +00001677 // Must have binary (not unary) expr here. Unary pointer increment doesn't
1678 // use this path.
1679 const BinaryOperator *BinOp = cast<BinaryOperator>(Ops.E);
1680
1681 if (BinOp->getLHS()->getType()->isPointerType() &&
1682 BinOp->getLHS()->getType()->getAs<PointerType>()->isVariableArrayType()) {
Eli Friedmandaa24a22009-03-28 02:45:41 +00001683 // The amount of the addition needs to account for the VLA size for
1684 // ptr-int
1685 // The amount of the division needs to account for the VLA size for
1686 // ptr-ptr.
Chris Lattner9a207232010-06-26 21:48:21 +00001687 CGF.ErrorUnsupported(BinOp, "VLA pointer subtraction");
Eli Friedmandaa24a22009-03-28 02:45:41 +00001688 }
1689
Chris Lattner9a207232010-06-26 21:48:21 +00001690 const QualType LHSType = BinOp->getLHS()->getType();
Steve Naroff14108da2009-07-10 23:34:53 +00001691 const QualType LHSElementType = LHSType->getPointeeType();
Daniel Dunbar8c6f57c2008-08-06 02:00:38 +00001692 if (!isa<llvm::PointerType>(Ops.RHS->getType())) {
1693 // pointer - int
1694 Value *Idx = Ops.RHS;
1695 unsigned Width = cast<llvm::IntegerType>(Idx->getType())->getBitWidth();
Sanjiv Gupta7cabee52009-04-24 02:40:57 +00001696 if (Width < CGF.LLVMPointerWidth) {
Daniel Dunbar8c6f57c2008-08-06 02:00:38 +00001697 // Zero or sign extend the pointer value based on whether the index is
1698 // signed or not.
Chris Lattner77b89b82010-06-27 07:15:29 +00001699 const llvm::Type *IdxType = CGF.IntPtrTy;
Chris Lattner9a207232010-06-26 21:48:21 +00001700 if (BinOp->getRHS()->getType()->isSignedIntegerType())
Daniel Dunbar8c6f57c2008-08-06 02:00:38 +00001701 Idx = Builder.CreateSExt(Idx, IdxType, "idx.ext");
1702 else
1703 Idx = Builder.CreateZExt(Idx, IdxType, "idx.ext");
1704 }
1705 Idx = Builder.CreateNeg(Idx, "sub.ptr.neg");
Daniel Dunbarb09fae72009-01-23 18:51:09 +00001706
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001707 // Handle interface types, which are not represented with a concrete type.
John McCallc12c5bb2010-05-15 11:32:37 +00001708 if (const ObjCObjectType *OIT = LHSElementType->getAs<ObjCObjectType>()) {
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001709 llvm::Value *InterfaceSize =
Owen Anderson4a28d5d2009-07-24 23:12:58 +00001710 llvm::ConstantInt::get(Idx->getType(),
Ken Dyck199c3d62010-01-11 17:06:35 +00001711 CGF.getContext().
1712 getTypeSizeInChars(OIT).getQuantity());
Daniel Dunbar2a866252009-04-25 05:08:32 +00001713 Idx = Builder.CreateMul(Idx, InterfaceSize);
Benjamin Kramer3c0ef8c2009-10-13 10:07:13 +00001714 const llvm::Type *i8Ty = llvm::Type::getInt8PtrTy(VMContext);
Daniel Dunbar2a866252009-04-25 05:08:32 +00001715 Value *LHSCasted = Builder.CreateBitCast(Ops.LHS, i8Ty);
1716 Value *Res = Builder.CreateGEP(LHSCasted, Idx, "add.ptr");
1717 return Builder.CreateBitCast(Res, Ops.LHS->getType());
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001718 }
Daniel Dunbar2a866252009-04-25 05:08:32 +00001719
Daniel Dunbarb09fae72009-01-23 18:51:09 +00001720 // Explicitly handle GNU void* and function pointer arithmetic
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001721 // extensions. The GNU void* casts amount to no-ops since our void* type is
1722 // i8*, but this is future proof.
Daniel Dunbarb09fae72009-01-23 18:51:09 +00001723 if (LHSElementType->isVoidType() || LHSElementType->isFunctionType()) {
Benjamin Kramer3c0ef8c2009-10-13 10:07:13 +00001724 const llvm::Type *i8Ty = llvm::Type::getInt8PtrTy(VMContext);
Daniel Dunbarb09fae72009-01-23 18:51:09 +00001725 Value *LHSCasted = Builder.CreateBitCast(Ops.LHS, i8Ty);
1726 Value *Res = Builder.CreateGEP(LHSCasted, Idx, "sub.ptr");
1727 return Builder.CreateBitCast(Res, Ops.LHS->getType());
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001728 }
1729
Dan Gohman664f8932009-08-12 00:33:55 +00001730 return Builder.CreateInBoundsGEP(Ops.LHS, Idx, "sub.ptr");
Daniel Dunbar820b0332008-08-05 00:47:03 +00001731 } else {
Daniel Dunbar8c6f57c2008-08-06 02:00:38 +00001732 // pointer - pointer
1733 Value *LHS = Ops.LHS;
1734 Value *RHS = Ops.RHS;
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001735
Ken Dyck199c3d62010-01-11 17:06:35 +00001736 CharUnits ElementSize;
Daniel Dunbar820b0332008-08-05 00:47:03 +00001737
Chris Lattnere5ed1512009-02-11 07:21:43 +00001738 // Handle GCC extension for pointer arithmetic on void* and function pointer
1739 // types.
1740 if (LHSElementType->isVoidType() || LHSElementType->isFunctionType()) {
Ken Dyck199c3d62010-01-11 17:06:35 +00001741 ElementSize = CharUnits::One();
Daniel Dunbar8c6f57c2008-08-06 02:00:38 +00001742 } else {
Ken Dyck199c3d62010-01-11 17:06:35 +00001743 ElementSize = CGF.getContext().getTypeSizeInChars(LHSElementType);
Daniel Dunbar8c6f57c2008-08-06 02:00:38 +00001744 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001745
Daniel Dunbar8c6f57c2008-08-06 02:00:38 +00001746 const llvm::Type *ResultType = ConvertType(Ops.Ty);
1747 LHS = Builder.CreatePtrToInt(LHS, ResultType, "sub.ptr.lhs.cast");
1748 RHS = Builder.CreatePtrToInt(RHS, ResultType, "sub.ptr.rhs.cast");
1749 Value *BytesBetween = Builder.CreateSub(LHS, RHS, "sub.ptr.sub");
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001750
Chris Lattnere5ed1512009-02-11 07:21:43 +00001751 // Optimize out the shift for element size of 1.
Ken Dyck199c3d62010-01-11 17:06:35 +00001752 if (ElementSize.isOne())
Chris Lattnere5ed1512009-02-11 07:21:43 +00001753 return BytesBetween;
Dan Gohmandf110942009-08-11 22:40:09 +00001754
1755 // Otherwise, do a full sdiv. This uses the "exact" form of sdiv, since
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001756 // pointer difference in C is only defined in the case where both operands
1757 // are pointing to elements of an array.
Ken Dyck199c3d62010-01-11 17:06:35 +00001758 Value *BytesPerElt =
1759 llvm::ConstantInt::get(ResultType, ElementSize.getQuantity());
Dan Gohmandf110942009-08-11 22:40:09 +00001760 return Builder.CreateExactSDiv(BytesBetween, BytesPerElt, "sub.ptr.div");
Chris Lattner7f02f722007-08-24 05:35:26 +00001761 }
Chris Lattner7f02f722007-08-24 05:35:26 +00001762}
1763
1764Value *ScalarExprEmitter::EmitShl(const BinOpInfo &Ops) {
1765 // LLVM requires the LHS and RHS to be the same type: promote or truncate the
1766 // RHS to the same size as the LHS.
1767 Value *RHS = Ops.RHS;
1768 if (Ops.LHS->getType() != RHS->getType())
1769 RHS = Builder.CreateIntCast(RHS, Ops.LHS->getType(), false, "sh_prom");
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001770
Mike Stumpbe07f602009-12-14 21:58:14 +00001771 if (CGF.CatchUndefined
1772 && isa<llvm::IntegerType>(Ops.LHS->getType())) {
1773 unsigned Width = cast<llvm::IntegerType>(Ops.LHS->getType())->getBitWidth();
1774 llvm::BasicBlock *Cont = CGF.createBasicBlock("cont");
1775 CGF.Builder.CreateCondBr(Builder.CreateICmpULT(RHS,
1776 llvm::ConstantInt::get(RHS->getType(), Width)),
Mike Stump15037ca2009-12-15 00:35:12 +00001777 Cont, CGF.getTrapBB());
Mike Stumpbe07f602009-12-14 21:58:14 +00001778 CGF.EmitBlock(Cont);
1779 }
1780
Chris Lattner7f02f722007-08-24 05:35:26 +00001781 return Builder.CreateShl(Ops.LHS, RHS, "shl");
1782}
1783
1784Value *ScalarExprEmitter::EmitShr(const BinOpInfo &Ops) {
1785 // LLVM requires the LHS and RHS to be the same type: promote or truncate the
1786 // RHS to the same size as the LHS.
1787 Value *RHS = Ops.RHS;
1788 if (Ops.LHS->getType() != RHS->getType())
1789 RHS = Builder.CreateIntCast(RHS, Ops.LHS->getType(), false, "sh_prom");
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001790
Mike Stumpbe07f602009-12-14 21:58:14 +00001791 if (CGF.CatchUndefined
1792 && isa<llvm::IntegerType>(Ops.LHS->getType())) {
1793 unsigned Width = cast<llvm::IntegerType>(Ops.LHS->getType())->getBitWidth();
1794 llvm::BasicBlock *Cont = CGF.createBasicBlock("cont");
1795 CGF.Builder.CreateCondBr(Builder.CreateICmpULT(RHS,
1796 llvm::ConstantInt::get(RHS->getType(), Width)),
Mike Stump15037ca2009-12-15 00:35:12 +00001797 Cont, CGF.getTrapBB());
Mike Stumpbe07f602009-12-14 21:58:14 +00001798 CGF.EmitBlock(Cont);
1799 }
1800
Douglas Gregorf6094622010-07-23 15:58:24 +00001801 if (Ops.Ty->hasUnsignedIntegerRepresentation())
Chris Lattner7f02f722007-08-24 05:35:26 +00001802 return Builder.CreateLShr(Ops.LHS, RHS, "shr");
1803 return Builder.CreateAShr(Ops.LHS, RHS, "shr");
1804}
1805
1806Value *ScalarExprEmitter::EmitCompare(const BinaryOperator *E,unsigned UICmpOpc,
1807 unsigned SICmpOpc, unsigned FCmpOpc) {
Mike Stump7f79f9b2009-05-29 15:46:01 +00001808 TestAndClearIgnoreResultAssign();
Chris Lattner4f1a7b32007-08-26 16:34:22 +00001809 Value *Result;
Chris Lattner7f02f722007-08-24 05:35:26 +00001810 QualType LHSTy = E->getLHS()->getType();
Eli Friedmanb81c7862009-12-11 07:36:43 +00001811 if (LHSTy->isMemberFunctionPointerType()) {
1812 Value *LHSPtr = CGF.EmitAnyExprToTemp(E->getLHS()).getAggregateAddr();
1813 Value *RHSPtr = CGF.EmitAnyExprToTemp(E->getRHS()).getAggregateAddr();
1814 llvm::Value *LHSFunc = Builder.CreateStructGEP(LHSPtr, 0);
1815 LHSFunc = Builder.CreateLoad(LHSFunc);
1816 llvm::Value *RHSFunc = Builder.CreateStructGEP(RHSPtr, 0);
1817 RHSFunc = Builder.CreateLoad(RHSFunc);
1818 Value *ResultF = Builder.CreateICmp((llvm::ICmpInst::Predicate)UICmpOpc,
1819 LHSFunc, RHSFunc, "cmp.func");
1820 Value *NullPtr = llvm::Constant::getNullValue(LHSFunc->getType());
1821 Value *ResultNull = Builder.CreateICmp((llvm::ICmpInst::Predicate)UICmpOpc,
1822 LHSFunc, NullPtr, "cmp.null");
1823 llvm::Value *LHSAdj = Builder.CreateStructGEP(LHSPtr, 1);
1824 LHSAdj = Builder.CreateLoad(LHSAdj);
1825 llvm::Value *RHSAdj = Builder.CreateStructGEP(RHSPtr, 1);
1826 RHSAdj = Builder.CreateLoad(RHSAdj);
1827 Value *ResultA = Builder.CreateICmp((llvm::ICmpInst::Predicate)UICmpOpc,
1828 LHSAdj, RHSAdj, "cmp.adj");
1829 if (E->getOpcode() == BinaryOperator::EQ) {
1830 Result = Builder.CreateOr(ResultNull, ResultA, "or.na");
1831 Result = Builder.CreateAnd(Result, ResultF, "and.f");
1832 } else {
1833 assert(E->getOpcode() == BinaryOperator::NE &&
1834 "Member pointer comparison other than == or != ?");
1835 Result = Builder.CreateAnd(ResultNull, ResultA, "and.na");
1836 Result = Builder.CreateOr(Result, ResultF, "or.f");
1837 }
1838 } else if (!LHSTy->isAnyComplexType()) {
Chris Lattner7f02f722007-08-24 05:35:26 +00001839 Value *LHS = Visit(E->getLHS());
1840 Value *RHS = Visit(E->getRHS());
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001841
Duncan Sandsf177d9d2010-02-15 16:14:01 +00001842 if (LHS->getType()->isFPOrFPVectorTy()) {
Nate Begeman7a66d7b2008-07-25 20:16:05 +00001843 Result = Builder.CreateFCmp((llvm::CmpInst::Predicate)FCmpOpc,
Chris Lattner7f02f722007-08-24 05:35:26 +00001844 LHS, RHS, "cmp");
Douglas Gregorf6094622010-07-23 15:58:24 +00001845 } else if (LHSTy->hasSignedIntegerRepresentation()) {
Eli Friedmanec2c1262008-05-29 15:09:15 +00001846 Result = Builder.CreateICmp((llvm::ICmpInst::Predicate)SICmpOpc,
Chris Lattner7f02f722007-08-24 05:35:26 +00001847 LHS, RHS, "cmp");
1848 } else {
Eli Friedmanec2c1262008-05-29 15:09:15 +00001849 // Unsigned integers and pointers.
1850 Result = Builder.CreateICmp((llvm::ICmpInst::Predicate)UICmpOpc,
Chris Lattner7f02f722007-08-24 05:35:26 +00001851 LHS, RHS, "cmp");
1852 }
Chris Lattner9c10fcf2009-07-08 01:08:03 +00001853
1854 // If this is a vector comparison, sign extend the result to the appropriate
1855 // vector integer type and return it (don't convert to bool).
1856 if (LHSTy->isVectorType())
1857 return Builder.CreateSExt(Result, ConvertType(E->getType()), "sext");
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001858
Chris Lattner7f02f722007-08-24 05:35:26 +00001859 } else {
1860 // Complex Comparison: can only be an equality comparison.
1861 CodeGenFunction::ComplexPairTy LHS = CGF.EmitComplexExpr(E->getLHS());
1862 CodeGenFunction::ComplexPairTy RHS = CGF.EmitComplexExpr(E->getRHS());
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001863
John McCall183700f2009-09-21 23:43:11 +00001864 QualType CETy = LHSTy->getAs<ComplexType>()->getElementType();
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001865
Chris Lattner4f1a7b32007-08-26 16:34:22 +00001866 Value *ResultR, *ResultI;
Chris Lattner7f02f722007-08-24 05:35:26 +00001867 if (CETy->isRealFloatingType()) {
1868 ResultR = Builder.CreateFCmp((llvm::FCmpInst::Predicate)FCmpOpc,
1869 LHS.first, RHS.first, "cmp.r");
1870 ResultI = Builder.CreateFCmp((llvm::FCmpInst::Predicate)FCmpOpc,
1871 LHS.second, RHS.second, "cmp.i");
1872 } else {
1873 // Complex comparisons can only be equality comparisons. As such, signed
1874 // and unsigned opcodes are the same.
1875 ResultR = Builder.CreateICmp((llvm::ICmpInst::Predicate)UICmpOpc,
1876 LHS.first, RHS.first, "cmp.r");
1877 ResultI = Builder.CreateICmp((llvm::ICmpInst::Predicate)UICmpOpc,
1878 LHS.second, RHS.second, "cmp.i");
1879 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001880
Chris Lattner7f02f722007-08-24 05:35:26 +00001881 if (E->getOpcode() == BinaryOperator::EQ) {
1882 Result = Builder.CreateAnd(ResultR, ResultI, "and.ri");
1883 } else {
1884 assert(E->getOpcode() == BinaryOperator::NE &&
1885 "Complex comparison other than == or != ?");
1886 Result = Builder.CreateOr(ResultR, ResultI, "or.ri");
1887 }
1888 }
Nuno Lopes32f62092009-01-11 23:22:37 +00001889
1890 return EmitScalarConversion(Result, CGF.getContext().BoolTy, E->getType());
Chris Lattner7f02f722007-08-24 05:35:26 +00001891}
1892
1893Value *ScalarExprEmitter::VisitBinAssign(const BinaryOperator *E) {
Mike Stump7f79f9b2009-05-29 15:46:01 +00001894 bool Ignore = TestAndClearIgnoreResultAssign();
1895
1896 // __block variables need to have the rhs evaluated first, plus this should
1897 // improve codegen just a little.
Chris Lattner7f02f722007-08-24 05:35:26 +00001898 Value *RHS = Visit(E->getRHS());
Mike Stumpb14e62d2009-12-16 02:57:00 +00001899 LValue LHS = EmitCheckedLValue(E->getLHS());
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001900
Daniel Dunbared3849b2008-11-19 09:36:46 +00001901 // Store the value into the LHS. Bit-fields are handled specially
Daniel Dunbar371d16f2008-11-19 11:54:05 +00001902 // because the result is altered by the store, i.e., [C99 6.5.16p1]
1903 // 'An assignment expression has the value of the left operand after
Eli Friedmandaa24a22009-03-28 02:45:41 +00001904 // the assignment...'.
Daniel Dunbard7f7d082010-06-29 22:00:45 +00001905 if (LHS.isBitField())
1906 CGF.EmitStoreThroughBitfieldLValue(RValue::get(RHS), LHS, E->getType(),
1907 &RHS);
1908 else
Daniel Dunbared3849b2008-11-19 09:36:46 +00001909 CGF.EmitStoreThroughLValue(RValue::get(RHS), LHS, E->getType());
Daniel Dunbard7f7d082010-06-29 22:00:45 +00001910
1911 // If the result is clearly ignored, return now.
Mike Stump7f79f9b2009-05-29 15:46:01 +00001912 if (Ignore)
1913 return 0;
Daniel Dunbard7f7d082010-06-29 22:00:45 +00001914
1915 // Objective-C property assignment never reloads the value following a store.
1916 if (LHS.isPropertyRef() || LHS.isKVCRef())
1917 return RHS;
1918
1919 // If the lvalue is non-volatile, return the computed value of the assignment.
1920 if (!LHS.isVolatileQualified())
1921 return RHS;
1922
1923 // Otherwise, reload the value.
Mike Stump7f79f9b2009-05-29 15:46:01 +00001924 return EmitLoadOfLValue(LHS, E->getType());
Chris Lattner7f02f722007-08-24 05:35:26 +00001925}
1926
1927Value *ScalarExprEmitter::VisitBinLAnd(const BinaryOperator *E) {
Chris Lattner7804bcb2009-10-17 04:24:20 +00001928 const llvm::Type *ResTy = ConvertType(E->getType());
1929
Chris Lattner20eb09d2008-11-12 08:26:50 +00001930 // If we have 0 && RHS, see if we can elide RHS, if so, just return 0.
1931 // If we have 1 && X, just emit X without inserting the control flow.
1932 if (int Cond = CGF.ConstantFoldsToSimpleInteger(E->getLHS())) {
1933 if (Cond == 1) { // If we have 1 && X, just emit X.
Chris Lattner0946ccd2008-11-11 07:41:27 +00001934 Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS());
Chris Lattner7804bcb2009-10-17 04:24:20 +00001935 // ZExt result to int or bool.
1936 return Builder.CreateZExtOrBitCast(RHSCond, ResTy, "land.ext");
Chris Lattner0946ccd2008-11-11 07:41:27 +00001937 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001938
Chris Lattner7804bcb2009-10-17 04:24:20 +00001939 // 0 && RHS: If it is safe, just elide the RHS, and return 0/false.
Chris Lattner20eb09d2008-11-12 08:26:50 +00001940 if (!CGF.ContainsLabel(E->getRHS()))
Chris Lattner7804bcb2009-10-17 04:24:20 +00001941 return llvm::Constant::getNullValue(ResTy);
Chris Lattner0946ccd2008-11-11 07:41:27 +00001942 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001943
Daniel Dunbar9615ecb2008-11-13 01:38:36 +00001944 llvm::BasicBlock *ContBlock = CGF.createBasicBlock("land.end");
1945 llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("land.rhs");
Chris Lattner20eb09d2008-11-12 08:26:50 +00001946
Chris Lattnerf7b5ea92008-11-12 08:38:24 +00001947 // Branch on the LHS first. If it is false, go to the failure (cont) block.
1948 CGF.EmitBranchOnBoolExpr(E->getLHS(), RHSBlock, ContBlock);
1949
1950 // Any edges into the ContBlock are now from an (indeterminate number of)
1951 // edges from this first condition. All of these values will be false. Start
1952 // setting up the PHI node in the Cont Block for this.
Owen Anderson0032b272009-08-13 21:57:51 +00001953 llvm::PHINode *PN = llvm::PHINode::Create(llvm::Type::getInt1Ty(VMContext),
1954 "", ContBlock);
Chris Lattnerf7b5ea92008-11-12 08:38:24 +00001955 PN->reserveOperandSpace(2); // Normal case, two inputs.
1956 for (llvm::pred_iterator PI = pred_begin(ContBlock), PE = pred_end(ContBlock);
1957 PI != PE; ++PI)
Owen Anderson3b144ba2009-07-31 17:39:36 +00001958 PN->addIncoming(llvm::ConstantInt::getFalse(VMContext), *PI);
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001959
Anders Carlsson72119a82010-02-04 17:18:07 +00001960 CGF.BeginConditionalBranch();
Chris Lattner7f02f722007-08-24 05:35:26 +00001961 CGF.EmitBlock(RHSBlock);
1962 Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS());
Anders Carlsson72119a82010-02-04 17:18:07 +00001963 CGF.EndConditionalBranch();
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001964
Chris Lattner7f02f722007-08-24 05:35:26 +00001965 // Reaquire the RHS block, as there may be subblocks inserted.
1966 RHSBlock = Builder.GetInsertBlock();
Chris Lattnerf7b5ea92008-11-12 08:38:24 +00001967
1968 // Emit an unconditional branch from this block to ContBlock. Insert an entry
1969 // into the phi node for the edge with the value of RHSCond.
Chris Lattner7f02f722007-08-24 05:35:26 +00001970 CGF.EmitBlock(ContBlock);
Chris Lattner7f02f722007-08-24 05:35:26 +00001971 PN->addIncoming(RHSCond, RHSBlock);
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001972
Chris Lattner7f02f722007-08-24 05:35:26 +00001973 // ZExt result to int.
Chris Lattner7804bcb2009-10-17 04:24:20 +00001974 return Builder.CreateZExtOrBitCast(PN, ResTy, "land.ext");
Chris Lattner7f02f722007-08-24 05:35:26 +00001975}
1976
1977Value *ScalarExprEmitter::VisitBinLOr(const BinaryOperator *E) {
Chris Lattner7804bcb2009-10-17 04:24:20 +00001978 const llvm::Type *ResTy = ConvertType(E->getType());
1979
Chris Lattner20eb09d2008-11-12 08:26:50 +00001980 // If we have 1 || RHS, see if we can elide RHS, if so, just return 1.
1981 // If we have 0 || X, just emit X without inserting the control flow.
1982 if (int Cond = CGF.ConstantFoldsToSimpleInteger(E->getLHS())) {
1983 if (Cond == -1) { // If we have 0 || X, just emit X.
Chris Lattner0946ccd2008-11-11 07:41:27 +00001984 Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS());
Chris Lattner7804bcb2009-10-17 04:24:20 +00001985 // ZExt result to int or bool.
1986 return Builder.CreateZExtOrBitCast(RHSCond, ResTy, "lor.ext");
Chris Lattner0946ccd2008-11-11 07:41:27 +00001987 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001988
Chris Lattner7804bcb2009-10-17 04:24:20 +00001989 // 1 || RHS: If it is safe, just elide the RHS, and return 1/true.
Chris Lattner20eb09d2008-11-12 08:26:50 +00001990 if (!CGF.ContainsLabel(E->getRHS()))
Chris Lattner7804bcb2009-10-17 04:24:20 +00001991 return llvm::ConstantInt::get(ResTy, 1);
Chris Lattner0946ccd2008-11-11 07:41:27 +00001992 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001993
Daniel Dunbar9615ecb2008-11-13 01:38:36 +00001994 llvm::BasicBlock *ContBlock = CGF.createBasicBlock("lor.end");
1995 llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("lor.rhs");
Mike Stumpdb52dcd2009-09-09 13:00:44 +00001996
Chris Lattnerf7b5ea92008-11-12 08:38:24 +00001997 // Branch on the LHS first. If it is true, go to the success (cont) block.
1998 CGF.EmitBranchOnBoolExpr(E->getLHS(), ContBlock, RHSBlock);
1999
2000 // Any edges into the ContBlock are now from an (indeterminate number of)
2001 // edges from this first condition. All of these values will be true. Start
2002 // setting up the PHI node in the Cont Block for this.
Owen Anderson0032b272009-08-13 21:57:51 +00002003 llvm::PHINode *PN = llvm::PHINode::Create(llvm::Type::getInt1Ty(VMContext),
2004 "", ContBlock);
Chris Lattnerf7b5ea92008-11-12 08:38:24 +00002005 PN->reserveOperandSpace(2); // Normal case, two inputs.
2006 for (llvm::pred_iterator PI = pred_begin(ContBlock), PE = pred_end(ContBlock);
2007 PI != PE; ++PI)
Owen Anderson3b144ba2009-07-31 17:39:36 +00002008 PN->addIncoming(llvm::ConstantInt::getTrue(VMContext), *PI);
Chris Lattnerf7b5ea92008-11-12 08:38:24 +00002009
Anders Carlsson72119a82010-02-04 17:18:07 +00002010 CGF.BeginConditionalBranch();
Anders Carlsson33da07d2009-06-04 02:53:13 +00002011
Chris Lattnerf7b5ea92008-11-12 08:38:24 +00002012 // Emit the RHS condition as a bool value.
Chris Lattner7f02f722007-08-24 05:35:26 +00002013 CGF.EmitBlock(RHSBlock);
2014 Value *RHSCond = CGF.EvaluateExprAsBool(E->getRHS());
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002015
Anders Carlsson72119a82010-02-04 17:18:07 +00002016 CGF.EndConditionalBranch();
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002017
Chris Lattner7f02f722007-08-24 05:35:26 +00002018 // Reaquire the RHS block, as there may be subblocks inserted.
2019 RHSBlock = Builder.GetInsertBlock();
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002020
Chris Lattnerf7b5ea92008-11-12 08:38:24 +00002021 // Emit an unconditional branch from this block to ContBlock. Insert an entry
2022 // into the phi node for the edge with the value of RHSCond.
2023 CGF.EmitBlock(ContBlock);
Chris Lattner7f02f722007-08-24 05:35:26 +00002024 PN->addIncoming(RHSCond, RHSBlock);
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002025
Chris Lattner7f02f722007-08-24 05:35:26 +00002026 // ZExt result to int.
Chris Lattner7804bcb2009-10-17 04:24:20 +00002027 return Builder.CreateZExtOrBitCast(PN, ResTy, "lor.ext");
Chris Lattner7f02f722007-08-24 05:35:26 +00002028}
2029
2030Value *ScalarExprEmitter::VisitBinComma(const BinaryOperator *E) {
2031 CGF.EmitStmt(E->getLHS());
Daniel Dunbara448fb22008-11-11 23:11:34 +00002032 CGF.EnsureInsertPoint();
Chris Lattner7f02f722007-08-24 05:35:26 +00002033 return Visit(E->getRHS());
2034}
2035
2036//===----------------------------------------------------------------------===//
2037// Other Operators
2038//===----------------------------------------------------------------------===//
2039
Chris Lattner9802a512008-11-12 08:55:54 +00002040/// isCheapEnoughToEvaluateUnconditionally - Return true if the specified
2041/// expression is cheap enough and side-effect-free enough to evaluate
2042/// unconditionally instead of conditionally. This is used to convert control
2043/// flow into selects in some cases.
Mike Stumpdf317bf2009-11-03 23:25:48 +00002044static bool isCheapEnoughToEvaluateUnconditionally(const Expr *E,
2045 CodeGenFunction &CGF) {
Chris Lattner9802a512008-11-12 08:55:54 +00002046 if (const ParenExpr *PE = dyn_cast<ParenExpr>(E))
Mike Stumpdf317bf2009-11-03 23:25:48 +00002047 return isCheapEnoughToEvaluateUnconditionally(PE->getSubExpr(), CGF);
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002048
Chris Lattner9802a512008-11-12 08:55:54 +00002049 // TODO: Allow anything we can constant fold to an integer or fp constant.
2050 if (isa<IntegerLiteral>(E) || isa<CharacterLiteral>(E) ||
2051 isa<FloatingLiteral>(E))
2052 return true;
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002053
Chris Lattner9802a512008-11-12 08:55:54 +00002054 // Non-volatile automatic variables too, to get "cond ? X : Y" where
2055 // X and Y are local variables.
2056 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E))
2057 if (const VarDecl *VD = dyn_cast<VarDecl>(DRE->getDecl()))
Mike Stumpdf317bf2009-11-03 23:25:48 +00002058 if (VD->hasLocalStorage() && !(CGF.getContext()
2059 .getCanonicalType(VD->getType())
2060 .isVolatileQualified()))
Chris Lattner9802a512008-11-12 08:55:54 +00002061 return true;
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002062
Chris Lattner9802a512008-11-12 08:55:54 +00002063 return false;
2064}
2065
2066
Chris Lattner7f02f722007-08-24 05:35:26 +00002067Value *ScalarExprEmitter::
2068VisitConditionalOperator(const ConditionalOperator *E) {
Mike Stump7f79f9b2009-05-29 15:46:01 +00002069 TestAndClearIgnoreResultAssign();
Chris Lattner31a09842008-11-12 08:04:58 +00002070 // If the condition constant folds and can be elided, try to avoid emitting
2071 // the condition and the dead arm.
2072 if (int Cond = CGF.ConstantFoldsToSimpleInteger(E->getCond())){
Chris Lattnerc657e922008-11-11 18:56:45 +00002073 Expr *Live = E->getLHS(), *Dead = E->getRHS();
Chris Lattner31a09842008-11-12 08:04:58 +00002074 if (Cond == -1)
Chris Lattnerc657e922008-11-11 18:56:45 +00002075 std::swap(Live, Dead);
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002076
Chris Lattner31a09842008-11-12 08:04:58 +00002077 // If the dead side doesn't have labels we need, and if the Live side isn't
2078 // the gnu missing ?: extension (which we could handle, but don't bother
2079 // to), just emit the Live part.
2080 if ((!Dead || !CGF.ContainsLabel(Dead)) && // No labels in dead part
2081 Live) // Live part isn't missing.
2082 return Visit(Live);
Chris Lattnerc657e922008-11-11 18:56:45 +00002083 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002084
2085
Chris Lattner9802a512008-11-12 08:55:54 +00002086 // If this is a really simple expression (like x ? 4 : 5), emit this as a
2087 // select instead of as control flow. We can only do this if it is cheap and
Chris Lattner531a5502008-11-16 06:16:27 +00002088 // safe to evaluate the LHS and RHS unconditionally.
Mike Stumpdf317bf2009-11-03 23:25:48 +00002089 if (E->getLHS() && isCheapEnoughToEvaluateUnconditionally(E->getLHS(),
2090 CGF) &&
2091 isCheapEnoughToEvaluateUnconditionally(E->getRHS(), CGF)) {
Chris Lattner9802a512008-11-12 08:55:54 +00002092 llvm::Value *CondV = CGF.EvaluateExprAsBool(E->getCond());
2093 llvm::Value *LHS = Visit(E->getLHS());
2094 llvm::Value *RHS = Visit(E->getRHS());
2095 return Builder.CreateSelect(CondV, LHS, RHS, "cond");
2096 }
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002097
2098
Daniel Dunbarbe65abc2008-11-12 10:13:37 +00002099 llvm::BasicBlock *LHSBlock = CGF.createBasicBlock("cond.true");
2100 llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("cond.false");
Daniel Dunbar9615ecb2008-11-13 01:38:36 +00002101 llvm::BasicBlock *ContBlock = CGF.createBasicBlock("cond.end");
Chris Lattner035cf422008-11-12 08:08:13 +00002102 Value *CondVal = 0;
Chris Lattner31a09842008-11-12 08:04:58 +00002103
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002104 // If we don't have the GNU missing condition extension, emit a branch on bool
2105 // the normal way.
Chris Lattner12d152f2009-02-13 23:35:32 +00002106 if (E->getLHS()) {
2107 // Otherwise, just use EmitBranchOnBoolExpr to get small and simple code for
2108 // the branch on bool.
2109 CGF.EmitBranchOnBoolExpr(E->getCond(), LHSBlock, RHSBlock);
2110 } else {
2111 // Otherwise, for the ?: extension, evaluate the conditional and then
2112 // convert it to bool the hard way. We do this explicitly because we need
2113 // the unconverted value for the missing middle value of the ?:.
Chris Lattner035cf422008-11-12 08:08:13 +00002114 CondVal = CGF.EmitScalarExpr(E->getCond());
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002115
Chris Lattner12d152f2009-02-13 23:35:32 +00002116 // In some cases, EmitScalarConversion will delete the "CondVal" expression
2117 // if there are no extra uses (an optimization). Inhibit this by making an
2118 // extra dead use, because we're going to add a use of CondVal later. We
2119 // don't use the builder for this, because we don't want it to get optimized
2120 // away. This leaves dead code, but the ?: extension isn't common.
2121 new llvm::BitCastInst(CondVal, CondVal->getType(), "dummy?:holder",
2122 Builder.GetInsertBlock());
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002123
Chris Lattner035cf422008-11-12 08:08:13 +00002124 Value *CondBoolVal =
2125 CGF.EmitScalarConversion(CondVal, E->getCond()->getType(),
2126 CGF.getContext().BoolTy);
2127 Builder.CreateCondBr(CondBoolVal, LHSBlock, RHSBlock);
Chris Lattner035cf422008-11-12 08:08:13 +00002128 }
Anders Carlssonfb6fa302009-06-04 03:00:32 +00002129
Anders Carlsson72119a82010-02-04 17:18:07 +00002130 CGF.BeginConditionalBranch();
Chris Lattner7f02f722007-08-24 05:35:26 +00002131 CGF.EmitBlock(LHSBlock);
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002132
Chris Lattner7f02f722007-08-24 05:35:26 +00002133 // Handle the GNU extension for missing LHS.
Chris Lattnera21ddb32007-11-26 01:40:58 +00002134 Value *LHS;
2135 if (E->getLHS())
Eli Friedman856226c2008-05-16 20:38:39 +00002136 LHS = Visit(E->getLHS());
Chris Lattnera21ddb32007-11-26 01:40:58 +00002137 else // Perform promotions, to handle cases like "short ?: int"
2138 LHS = EmitScalarConversion(CondVal, E->getCond()->getType(), E->getType());
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002139
Anders Carlsson72119a82010-02-04 17:18:07 +00002140 CGF.EndConditionalBranch();
Chris Lattner7f02f722007-08-24 05:35:26 +00002141 LHSBlock = Builder.GetInsertBlock();
Daniel Dunbard57a8712008-11-11 09:41:28 +00002142 CGF.EmitBranch(ContBlock);
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002143
Anders Carlsson72119a82010-02-04 17:18:07 +00002144 CGF.BeginConditionalBranch();
Chris Lattner7f02f722007-08-24 05:35:26 +00002145 CGF.EmitBlock(RHSBlock);
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002146
Eli Friedman856226c2008-05-16 20:38:39 +00002147 Value *RHS = Visit(E->getRHS());
Anders Carlsson72119a82010-02-04 17:18:07 +00002148 CGF.EndConditionalBranch();
Chris Lattner7f02f722007-08-24 05:35:26 +00002149 RHSBlock = Builder.GetInsertBlock();
Daniel Dunbard57a8712008-11-11 09:41:28 +00002150 CGF.EmitBranch(ContBlock);
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002151
Chris Lattner7f02f722007-08-24 05:35:26 +00002152 CGF.EmitBlock(ContBlock);
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002153
Eli Friedman48daf592009-12-07 20:25:53 +00002154 // If the LHS or RHS is a throw expression, it will be legitimately null.
2155 if (!LHS)
2156 return RHS;
2157 if (!RHS)
2158 return LHS;
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002159
Chris Lattner7f02f722007-08-24 05:35:26 +00002160 // Create a PHI node for the real part.
2161 llvm::PHINode *PN = Builder.CreatePHI(LHS->getType(), "cond");
2162 PN->reserveOperandSpace(2);
2163 PN->addIncoming(LHS, LHSBlock);
2164 PN->addIncoming(RHS, RHSBlock);
2165 return PN;
2166}
2167
2168Value *ScalarExprEmitter::VisitChooseExpr(ChooseExpr *E) {
Eli Friedman79769322009-03-04 05:52:32 +00002169 return Visit(E->getChosenSubExpr(CGF.getContext()));
Chris Lattner7f02f722007-08-24 05:35:26 +00002170}
2171
Chris Lattner2202bce2007-11-30 17:56:23 +00002172Value *ScalarExprEmitter::VisitVAArgExpr(VAArgExpr *VE) {
Eli Friedman4fd0aa52009-01-20 17:46:04 +00002173 llvm::Value *ArgValue = CGF.EmitVAListRef(VE->getSubExpr());
Anders Carlssonddf7cac2008-11-04 05:30:00 +00002174 llvm::Value *ArgPtr = CGF.EmitVAArg(ArgValue, VE->getType());
2175
2176 // If EmitVAArg fails, we fall back to the LLVM instruction.
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002177 if (!ArgPtr)
Anders Carlssonddf7cac2008-11-04 05:30:00 +00002178 return Builder.CreateVAArg(ArgValue, ConvertType(VE->getType()));
2179
Mike Stump7f79f9b2009-05-29 15:46:01 +00002180 // FIXME Volatility.
Anders Carlssonddf7cac2008-11-04 05:30:00 +00002181 return Builder.CreateLoad(ArgPtr);
Anders Carlsson7c50aca2007-10-15 20:28:48 +00002182}
2183
Mike Stumpdf6b68c2009-02-12 18:29:15 +00002184Value *ScalarExprEmitter::VisitBlockExpr(const BlockExpr *BE) {
Mike Stump08920992009-03-07 02:35:30 +00002185 return CGF.BuildBlockLiteralTmp(BE);
Mike Stumpdf6b68c2009-02-12 18:29:15 +00002186}
2187
Chris Lattner7f02f722007-08-24 05:35:26 +00002188//===----------------------------------------------------------------------===//
2189// Entry Point into this File
2190//===----------------------------------------------------------------------===//
2191
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002192/// EmitScalarExpr - Emit the computation of the specified expression of scalar
2193/// type, ignoring the result.
Mike Stump7f79f9b2009-05-29 15:46:01 +00002194Value *CodeGenFunction::EmitScalarExpr(const Expr *E, bool IgnoreResultAssign) {
Chris Lattner7f02f722007-08-24 05:35:26 +00002195 assert(E && !hasAggregateLLVMType(E->getType()) &&
2196 "Invalid scalar expression to emit");
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002197
Mike Stump7f79f9b2009-05-29 15:46:01 +00002198 return ScalarExprEmitter(*this, IgnoreResultAssign)
2199 .Visit(const_cast<Expr*>(E));
Chris Lattner7f02f722007-08-24 05:35:26 +00002200}
Chris Lattner3707b252007-08-26 06:48:56 +00002201
2202/// EmitScalarConversion - Emit a conversion from the specified type to the
2203/// specified destination type, both of which are LLVM scalar types.
Chris Lattner4f1a7b32007-08-26 16:34:22 +00002204Value *CodeGenFunction::EmitScalarConversion(Value *Src, QualType SrcTy,
2205 QualType DstTy) {
Chris Lattner3707b252007-08-26 06:48:56 +00002206 assert(!hasAggregateLLVMType(SrcTy) && !hasAggregateLLVMType(DstTy) &&
2207 "Invalid scalar expression to emit");
2208 return ScalarExprEmitter(*this).EmitScalarConversion(Src, SrcTy, DstTy);
2209}
Chris Lattner4f1a7b32007-08-26 16:34:22 +00002210
Mike Stumpdb52dcd2009-09-09 13:00:44 +00002211/// EmitComplexToScalarConversion - Emit a conversion from the specified complex
2212/// type to the specified destination type, where the destination type is an
2213/// LLVM scalar type.
Chris Lattner4f1a7b32007-08-26 16:34:22 +00002214Value *CodeGenFunction::EmitComplexToScalarConversion(ComplexPairTy Src,
2215 QualType SrcTy,
2216 QualType DstTy) {
Chris Lattner9b2dc282008-04-04 16:54:41 +00002217 assert(SrcTy->isAnyComplexType() && !hasAggregateLLVMType(DstTy) &&
Chris Lattner4f1a7b32007-08-26 16:34:22 +00002218 "Invalid complex -> scalar conversion");
2219 return ScalarExprEmitter(*this).EmitComplexToScalarConversion(Src, SrcTy,
2220 DstTy);
2221}
Anders Carlssoncc23aca2007-12-10 19:35:18 +00002222
Chris Lattner8c11a652010-06-26 22:09:34 +00002223
2224llvm::Value *CodeGenFunction::
2225EmitScalarPrePostIncDec(const UnaryOperator *E, LValue LV,
2226 bool isInc, bool isPre) {
2227 return ScalarExprEmitter(*this).EmitScalarPrePostIncDec(E, LV, isInc, isPre);
2228}
2229
Fariborz Jahanian820bca42009-12-09 23:35:29 +00002230LValue CodeGenFunction::EmitObjCIsaExpr(const ObjCIsaExpr *E) {
2231 llvm::Value *V;
2232 // object->isa or (*object).isa
2233 // Generate code as for: *(Class*)object
Fariborz Jahanian820bca42009-12-09 23:35:29 +00002234 // build Class* type
2235 const llvm::Type *ClassPtrTy = ConvertType(E->getType());
Fariborz Jahanian5ed676c2010-02-05 19:18:30 +00002236
2237 Expr *BaseExpr = E->getBase();
2238 if (BaseExpr->isLvalue(getContext()) != Expr::LV_Valid) {
2239 V = CreateTempAlloca(ClassPtrTy, "resval");
2240 llvm::Value *Src = EmitScalarExpr(BaseExpr);
2241 Builder.CreateStore(Src, V);
Fariborz Jahanian9f9efe62010-03-03 22:09:47 +00002242 LValue LV = LValue::MakeAddr(V, MakeQualifiers(E->getType()));
2243 V = ScalarExprEmitter(*this).EmitLoadOfLValue(LV, E->getType());
Fariborz Jahanian5ed676c2010-02-05 19:18:30 +00002244 }
2245 else {
2246 if (E->isArrow())
2247 V = ScalarExprEmitter(*this).EmitLoadOfLValue(BaseExpr);
2248 else
2249 V = EmitLValue(BaseExpr).getAddress();
2250 }
2251
2252 // build Class* type
Fariborz Jahanian820bca42009-12-09 23:35:29 +00002253 ClassPtrTy = ClassPtrTy->getPointerTo();
2254 V = Builder.CreateBitCast(V, ClassPtrTy);
2255 LValue LV = LValue::MakeAddr(V, MakeQualifiers(E->getType()));
2256 return LV;
2257}
2258
Douglas Gregor6a03e342010-04-23 04:16:32 +00002259
2260LValue CodeGenFunction::EmitCompoundAssignOperatorLValue(
2261 const CompoundAssignOperator *E) {
2262 ScalarExprEmitter Scalar(*this);
Daniel Dunbard7f7d082010-06-29 22:00:45 +00002263 Value *Result = 0;
Douglas Gregor6a03e342010-04-23 04:16:32 +00002264 switch (E->getOpcode()) {
2265#define COMPOUND_OP(Op) \
2266 case BinaryOperator::Op##Assign: \
2267 return Scalar.EmitCompoundAssignLValue(E, &ScalarExprEmitter::Emit##Op, \
Daniel Dunbard7f7d082010-06-29 22:00:45 +00002268 Result)
Douglas Gregor6a03e342010-04-23 04:16:32 +00002269 COMPOUND_OP(Mul);
2270 COMPOUND_OP(Div);
2271 COMPOUND_OP(Rem);
2272 COMPOUND_OP(Add);
2273 COMPOUND_OP(Sub);
2274 COMPOUND_OP(Shl);
2275 COMPOUND_OP(Shr);
2276 COMPOUND_OP(And);
2277 COMPOUND_OP(Xor);
2278 COMPOUND_OP(Or);
2279#undef COMPOUND_OP
2280
2281 case BinaryOperator::PtrMemD:
2282 case BinaryOperator::PtrMemI:
2283 case BinaryOperator::Mul:
2284 case BinaryOperator::Div:
2285 case BinaryOperator::Rem:
2286 case BinaryOperator::Add:
2287 case BinaryOperator::Sub:
2288 case BinaryOperator::Shl:
2289 case BinaryOperator::Shr:
2290 case BinaryOperator::LT:
2291 case BinaryOperator::GT:
2292 case BinaryOperator::LE:
2293 case BinaryOperator::GE:
2294 case BinaryOperator::EQ:
2295 case BinaryOperator::NE:
2296 case BinaryOperator::And:
2297 case BinaryOperator::Xor:
2298 case BinaryOperator::Or:
2299 case BinaryOperator::LAnd:
2300 case BinaryOperator::LOr:
2301 case BinaryOperator::Assign:
2302 case BinaryOperator::Comma:
2303 assert(false && "Not valid compound assignment operators");
2304 break;
2305 }
2306
2307 llvm_unreachable("Unhandled compound assignment operator");
2308}