1 //===--- CGExprComplex.cpp - Emit LLVM Code for Complex Exprs -------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This contains code to emit Expr nodes with complex types as LLVM code.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "CodeGenFunction.h"
15 #include "CodeGenModule.h"
16 #include "clang/AST/ASTContext.h"
17 #include "clang/AST/StmtVisitor.h"
18 #include "llvm/Constants.h"
19 #include "llvm/Function.h"
20 #include "llvm/ADT/SmallString.h"
21 using namespace clang;
22 using namespace CodeGen;
23 
24 //===----------------------------------------------------------------------===//
25 //                        Complex Expression Emitter
26 //===----------------------------------------------------------------------===//
27 
28 typedef CodeGenFunction::ComplexPairTy ComplexPairTy;
29 
30 namespace  {
31 class ComplexExprEmitter
32   : public StmtVisitor<ComplexExprEmitter, ComplexPairTy> {
33   CodeGenFunction &CGF;
34   CGBuilderTy &Builder;
35   // True is we should ignore the value of a
36   bool IgnoreReal;
37   bool IgnoreImag;
38 public:
39   ComplexExprEmitter(CodeGenFunction &cgf, bool ir=false, bool ii=false)
40     : CGF(cgf), Builder(CGF.Builder), IgnoreReal(ir), IgnoreImag(ii) {
41   }
42 
43 
44   //===--------------------------------------------------------------------===//
45   //                               Utilities
46   //===--------------------------------------------------------------------===//
47 
48   bool TestAndClearIgnoreReal() {
49     bool I = IgnoreReal;
50     IgnoreReal = false;
51     return I;
52   }
53   bool TestAndClearIgnoreImag() {
54     bool I = IgnoreImag;
55     IgnoreImag = false;
56     return I;
57   }
58 
59   /// EmitLoadOfLValue - Given an expression with complex type that represents a
60   /// value l-value, this method emits the address of the l-value, then loads
61   /// and returns the result.
62   ComplexPairTy EmitLoadOfLValue(const Expr *E) {
63     return EmitLoadOfLValue(CGF.EmitLValue(E));
64   }
65 
66   ComplexPairTy EmitLoadOfLValue(LValue LV) {
67     assert(LV.isSimple() && "complex l-value must be simple");
68     return EmitLoadOfComplex(LV.getAddress(), LV.isVolatileQualified());
69   }
70 
71   /// EmitLoadOfComplex - Given a pointer to a complex value, emit code to load
72   /// the real and imaginary pieces.
73   ComplexPairTy EmitLoadOfComplex(llvm::Value *SrcPtr, bool isVolatile);
74 
75   /// EmitStoreThroughLValue - Given an l-value of complex type, store
76   /// a complex number into it.
77   void EmitStoreThroughLValue(ComplexPairTy Val, LValue LV) {
78     assert(LV.isSimple() && "complex l-value must be simple");
79     return EmitStoreOfComplex(Val, LV.getAddress(), LV.isVolatileQualified());
80   }
81 
82   /// EmitStoreOfComplex - Store the specified real/imag parts into the
83   /// specified value pointer.
84   void EmitStoreOfComplex(ComplexPairTy Val, llvm::Value *ResPtr, bool isVol);
85 
86   /// EmitComplexToComplexCast - Emit a cast from complex value Val to DestType.
87   ComplexPairTy EmitComplexToComplexCast(ComplexPairTy Val, QualType SrcType,
88                                          QualType DestType);
89 
90   //===--------------------------------------------------------------------===//
91   //                            Visitor Methods
92   //===--------------------------------------------------------------------===//
93 
94   ComplexPairTy Visit(Expr *E) {
95     return StmtVisitor<ComplexExprEmitter, ComplexPairTy>::Visit(E);
96   }
97 
98   ComplexPairTy VisitStmt(Stmt *S) {
99     S->dump(CGF.getContext().getSourceManager());
100     llvm_unreachable("Stmt can't have complex result type!");
101   }
102   ComplexPairTy VisitExpr(Expr *S);
103   ComplexPairTy VisitParenExpr(ParenExpr *PE) { return Visit(PE->getSubExpr());}
104   ComplexPairTy VisitGenericSelectionExpr(GenericSelectionExpr *GE) {
105     return Visit(GE->getResultExpr());
106   }
107   ComplexPairTy VisitImaginaryLiteral(const ImaginaryLiteral *IL);
108   ComplexPairTy
109   VisitSubstNonTypeTemplateParmExpr(SubstNonTypeTemplateParmExpr *PE) {
110     return Visit(PE->getReplacement());
111   }
112 
113   // l-values.
114   ComplexPairTy VisitDeclRefExpr(const Expr *E) { return EmitLoadOfLValue(E); }
115   ComplexPairTy VisitBlockDeclRefExpr(const Expr *E) { return EmitLoadOfLValue(E); }
116   ComplexPairTy VisitObjCIvarRefExpr(ObjCIvarRefExpr *E) {
117     return EmitLoadOfLValue(E);
118   }
119   ComplexPairTy VisitObjCMessageExpr(ObjCMessageExpr *E) {
120     return CGF.EmitObjCMessageExpr(E).getComplexVal();
121   }
122   ComplexPairTy VisitArraySubscriptExpr(Expr *E) { return EmitLoadOfLValue(E); }
123   ComplexPairTy VisitMemberExpr(const Expr *E) { return EmitLoadOfLValue(E); }
124   ComplexPairTy VisitOpaqueValueExpr(OpaqueValueExpr *E) {
125     if (E->isGLValue())
126       return EmitLoadOfLValue(CGF.getOpaqueLValueMapping(E));
127     return CGF.getOpaqueRValueMapping(E).getComplexVal();
128   }
129 
130   ComplexPairTy VisitPseudoObjectExpr(PseudoObjectExpr *E) {
131     return CGF.EmitPseudoObjectRValue(E).getComplexVal();
132   }
133 
134   // FIXME: CompoundLiteralExpr
135 
136   ComplexPairTy EmitCast(CastExpr::CastKind CK, Expr *Op, QualType DestTy);
137   ComplexPairTy VisitImplicitCastExpr(ImplicitCastExpr *E) {
138     // Unlike for scalars, we don't have to worry about function->ptr demotion
139     // here.
140     return EmitCast(E->getCastKind(), E->getSubExpr(), E->getType());
141   }
142   ComplexPairTy VisitCastExpr(CastExpr *E) {
143     return EmitCast(E->getCastKind(), E->getSubExpr(), E->getType());
144   }
145   ComplexPairTy VisitCallExpr(const CallExpr *E);
146   ComplexPairTy VisitStmtExpr(const StmtExpr *E);
147 
148   // Operators.
149   ComplexPairTy VisitPrePostIncDec(const UnaryOperator *E,
150                                    bool isInc, bool isPre) {
151     LValue LV = CGF.EmitLValue(E->getSubExpr());
152     return CGF.EmitComplexPrePostIncDec(E, LV, isInc, isPre);
153   }
154   ComplexPairTy VisitUnaryPostDec(const UnaryOperator *E) {
155     return VisitPrePostIncDec(E, false, false);
156   }
157   ComplexPairTy VisitUnaryPostInc(const UnaryOperator *E) {
158     return VisitPrePostIncDec(E, true, false);
159   }
160   ComplexPairTy VisitUnaryPreDec(const UnaryOperator *E) {
161     return VisitPrePostIncDec(E, false, true);
162   }
163   ComplexPairTy VisitUnaryPreInc(const UnaryOperator *E) {
164     return VisitPrePostIncDec(E, true, true);
165   }
166   ComplexPairTy VisitUnaryDeref(const Expr *E) { return EmitLoadOfLValue(E); }
167   ComplexPairTy VisitUnaryPlus     (const UnaryOperator *E) {
168     TestAndClearIgnoreReal();
169     TestAndClearIgnoreImag();
170     return Visit(E->getSubExpr());
171   }
172   ComplexPairTy VisitUnaryMinus    (const UnaryOperator *E);
173   ComplexPairTy VisitUnaryNot      (const UnaryOperator *E);
174   // LNot,Real,Imag never return complex.
175   ComplexPairTy VisitUnaryExtension(const UnaryOperator *E) {
176     return Visit(E->getSubExpr());
177   }
178   ComplexPairTy VisitCXXDefaultArgExpr(CXXDefaultArgExpr *DAE) {
179     return Visit(DAE->getExpr());
180   }
181   ComplexPairTy VisitExprWithCleanups(ExprWithCleanups *E) {
182     return CGF.EmitExprWithCleanups(E).getComplexVal();
183   }
184   ComplexPairTy VisitCXXScalarValueInitExpr(CXXScalarValueInitExpr *E) {
185     assert(E->getType()->isAnyComplexType() && "Expected complex type!");
186     QualType Elem = E->getType()->getAs<ComplexType>()->getElementType();
187     llvm::Constant *Null = llvm::Constant::getNullValue(CGF.ConvertType(Elem));
188     return ComplexPairTy(Null, Null);
189   }
190   ComplexPairTy VisitImplicitValueInitExpr(ImplicitValueInitExpr *E) {
191     assert(E->getType()->isAnyComplexType() && "Expected complex type!");
192     QualType Elem = E->getType()->getAs<ComplexType>()->getElementType();
193     llvm::Constant *Null =
194                        llvm::Constant::getNullValue(CGF.ConvertType(Elem));
195     return ComplexPairTy(Null, Null);
196   }
197 
198   struct BinOpInfo {
199     ComplexPairTy LHS;
200     ComplexPairTy RHS;
201     QualType Ty;  // Computation Type.
202   };
203 
204   BinOpInfo EmitBinOps(const BinaryOperator *E);
205   LValue EmitCompoundAssignLValue(const CompoundAssignOperator *E,
206                                   ComplexPairTy (ComplexExprEmitter::*Func)
207                                   (const BinOpInfo &),
208                                   ComplexPairTy &Val);
209   ComplexPairTy EmitCompoundAssign(const CompoundAssignOperator *E,
210                                    ComplexPairTy (ComplexExprEmitter::*Func)
211                                    (const BinOpInfo &));
212 
213   ComplexPairTy EmitBinAdd(const BinOpInfo &Op);
214   ComplexPairTy EmitBinSub(const BinOpInfo &Op);
215   ComplexPairTy EmitBinMul(const BinOpInfo &Op);
216   ComplexPairTy EmitBinDiv(const BinOpInfo &Op);
217 
218   ComplexPairTy VisitBinAdd(const BinaryOperator *E) {
219     return EmitBinAdd(EmitBinOps(E));
220   }
221   ComplexPairTy VisitBinSub(const BinaryOperator *E) {
222     return EmitBinSub(EmitBinOps(E));
223   }
224   ComplexPairTy VisitBinMul(const BinaryOperator *E) {
225     return EmitBinMul(EmitBinOps(E));
226   }
227   ComplexPairTy VisitBinDiv(const BinaryOperator *E) {
228     return EmitBinDiv(EmitBinOps(E));
229   }
230 
231   // Compound assignments.
232   ComplexPairTy VisitBinAddAssign(const CompoundAssignOperator *E) {
233     return EmitCompoundAssign(E, &ComplexExprEmitter::EmitBinAdd);
234   }
235   ComplexPairTy VisitBinSubAssign(const CompoundAssignOperator *E) {
236     return EmitCompoundAssign(E, &ComplexExprEmitter::EmitBinSub);
237   }
238   ComplexPairTy VisitBinMulAssign(const CompoundAssignOperator *E) {
239     return EmitCompoundAssign(E, &ComplexExprEmitter::EmitBinMul);
240   }
241   ComplexPairTy VisitBinDivAssign(const CompoundAssignOperator *E) {
242     return EmitCompoundAssign(E, &ComplexExprEmitter::EmitBinDiv);
243   }
244 
245   // GCC rejects rem/and/or/xor for integer complex.
246   // Logical and/or always return int, never complex.
247 
248   // No comparisons produce a complex result.
249 
250   LValue EmitBinAssignLValue(const BinaryOperator *E,
251                              ComplexPairTy &Val);
252   ComplexPairTy VisitBinAssign     (const BinaryOperator *E);
253   ComplexPairTy VisitBinComma      (const BinaryOperator *E);
254 
255 
256   ComplexPairTy
257   VisitAbstractConditionalOperator(const AbstractConditionalOperator *CO);
258   ComplexPairTy VisitChooseExpr(ChooseExpr *CE);
259 
260   ComplexPairTy VisitInitListExpr(InitListExpr *E);
261 
262   ComplexPairTy VisitVAArgExpr(VAArgExpr *E);
263 
264   ComplexPairTy VisitAtomicExpr(AtomicExpr *E) {
265     return CGF.EmitAtomicExpr(E).getComplexVal();
266   }
267 };
268 }  // end anonymous namespace.
269 
270 //===----------------------------------------------------------------------===//
271 //                                Utilities
272 //===----------------------------------------------------------------------===//
273 
274 /// EmitLoadOfComplex - Given an RValue reference for a complex, emit code to
275 /// load the real and imaginary pieces, returning them as Real/Imag.
276 ComplexPairTy ComplexExprEmitter::EmitLoadOfComplex(llvm::Value *SrcPtr,
277                                                     bool isVolatile) {
278   llvm::Value *Real=0, *Imag=0;
279 
280   if (!IgnoreReal || isVolatile) {
281     llvm::Value *RealP = Builder.CreateStructGEP(SrcPtr, 0,
282                                                  SrcPtr->getName() + ".realp");
283     Real = Builder.CreateLoad(RealP, isVolatile, SrcPtr->getName() + ".real");
284   }
285 
286   if (!IgnoreImag || isVolatile) {
287     llvm::Value *ImagP = Builder.CreateStructGEP(SrcPtr, 1,
288                                                  SrcPtr->getName() + ".imagp");
289     Imag = Builder.CreateLoad(ImagP, isVolatile, SrcPtr->getName() + ".imag");
290   }
291   return ComplexPairTy(Real, Imag);
292 }
293 
294 /// EmitStoreOfComplex - Store the specified real/imag parts into the
295 /// specified value pointer.
296 void ComplexExprEmitter::EmitStoreOfComplex(ComplexPairTy Val, llvm::Value *Ptr,
297                                             bool isVolatile) {
298   llvm::Value *RealPtr = Builder.CreateStructGEP(Ptr, 0, "real");
299   llvm::Value *ImagPtr = Builder.CreateStructGEP(Ptr, 1, "imag");
300 
301   Builder.CreateStore(Val.first, RealPtr, isVolatile);
302   Builder.CreateStore(Val.second, ImagPtr, isVolatile);
303 }
304 
305 
306 
307 //===----------------------------------------------------------------------===//
308 //                            Visitor Methods
309 //===----------------------------------------------------------------------===//
310 
311 ComplexPairTy ComplexExprEmitter::VisitExpr(Expr *E) {
312   CGF.ErrorUnsupported(E, "complex expression");
313   llvm::Type *EltTy =
314   CGF.ConvertType(E->getType()->getAs<ComplexType>()->getElementType());
315   llvm::Value *U = llvm::UndefValue::get(EltTy);
316   return ComplexPairTy(U, U);
317 }
318 
319 ComplexPairTy ComplexExprEmitter::
320 VisitImaginaryLiteral(const ImaginaryLiteral *IL) {
321   llvm::Value *Imag = CGF.EmitScalarExpr(IL->getSubExpr());
322   return ComplexPairTy(llvm::Constant::getNullValue(Imag->getType()), Imag);
323 }
324 
325 
326 ComplexPairTy ComplexExprEmitter::VisitCallExpr(const CallExpr *E) {
327   if (E->getCallReturnType()->isReferenceType())
328     return EmitLoadOfLValue(E);
329 
330   return CGF.EmitCallExpr(E).getComplexVal();
331 }
332 
333 ComplexPairTy ComplexExprEmitter::VisitStmtExpr(const StmtExpr *E) {
334   CodeGenFunction::StmtExprEvaluation eval(CGF);
335   return CGF.EmitCompoundStmt(*E->getSubStmt(), true).getComplexVal();
336 }
337 
338 /// EmitComplexToComplexCast - Emit a cast from complex value Val to DestType.
339 ComplexPairTy ComplexExprEmitter::EmitComplexToComplexCast(ComplexPairTy Val,
340                                                            QualType SrcType,
341                                                            QualType DestType) {
342   // Get the src/dest element type.
343   SrcType = SrcType->getAs<ComplexType>()->getElementType();
344   DestType = DestType->getAs<ComplexType>()->getElementType();
345 
346   // C99 6.3.1.6: When a value of complex type is converted to another
347   // complex type, both the real and imaginary parts follow the conversion
348   // rules for the corresponding real types.
349   Val.first = CGF.EmitScalarConversion(Val.first, SrcType, DestType);
350   Val.second = CGF.EmitScalarConversion(Val.second, SrcType, DestType);
351   return Val;
352 }
353 
354 ComplexPairTy ComplexExprEmitter::EmitCast(CastExpr::CastKind CK, Expr *Op,
355                                            QualType DestTy) {
356   switch (CK) {
357   case CK_Dependent: llvm_unreachable("dependent cast kind in IR gen!");
358   case CK_GetObjCProperty: llvm_unreachable("GetObjCProperty!");
359 
360   case CK_NoOp:
361   case CK_LValueToRValue:
362   case CK_UserDefinedConversion:
363     return Visit(Op);
364 
365   case CK_LValueBitCast: {
366     llvm::Value *V = CGF.EmitLValue(Op).getAddress();
367     V = Builder.CreateBitCast(V,
368                     CGF.ConvertType(CGF.getContext().getPointerType(DestTy)));
369     // FIXME: Are the qualifiers correct here?
370     return EmitLoadOfComplex(V, DestTy.isVolatileQualified());
371   }
372 
373   case CK_BitCast:
374   case CK_BaseToDerived:
375   case CK_DerivedToBase:
376   case CK_UncheckedDerivedToBase:
377   case CK_Dynamic:
378   case CK_ToUnion:
379   case CK_ArrayToPointerDecay:
380   case CK_FunctionToPointerDecay:
381   case CK_NullToPointer:
382   case CK_NullToMemberPointer:
383   case CK_BaseToDerivedMemberPointer:
384   case CK_DerivedToBaseMemberPointer:
385   case CK_MemberPointerToBoolean:
386   case CK_ConstructorConversion:
387   case CK_IntegralToPointer:
388   case CK_PointerToIntegral:
389   case CK_PointerToBoolean:
390   case CK_ToVoid:
391   case CK_VectorSplat:
392   case CK_IntegralCast:
393   case CK_IntegralToBoolean:
394   case CK_IntegralToFloating:
395   case CK_FloatingToIntegral:
396   case CK_FloatingToBoolean:
397   case CK_FloatingCast:
398   case CK_CPointerToObjCPointerCast:
399   case CK_BlockPointerToObjCPointerCast:
400   case CK_AnyPointerToBlockPointerCast:
401   case CK_ObjCObjectLValueCast:
402   case CK_FloatingComplexToReal:
403   case CK_FloatingComplexToBoolean:
404   case CK_IntegralComplexToReal:
405   case CK_IntegralComplexToBoolean:
406   case CK_ARCProduceObject:
407   case CK_ARCConsumeObject:
408   case CK_ARCReclaimReturnedObject:
409   case CK_ARCExtendBlockObject:
410     llvm_unreachable("invalid cast kind for complex value");
411 
412   case CK_FloatingRealToComplex:
413   case CK_IntegralRealToComplex: {
414     llvm::Value *Elt = CGF.EmitScalarExpr(Op);
415 
416     // Convert the input element to the element type of the complex.
417     DestTy = DestTy->getAs<ComplexType>()->getElementType();
418     Elt = CGF.EmitScalarConversion(Elt, Op->getType(), DestTy);
419 
420     // Return (realval, 0).
421     return ComplexPairTy(Elt, llvm::Constant::getNullValue(Elt->getType()));
422   }
423 
424   case CK_FloatingComplexCast:
425   case CK_FloatingComplexToIntegralComplex:
426   case CK_IntegralComplexCast:
427   case CK_IntegralComplexToFloatingComplex:
428     return EmitComplexToComplexCast(Visit(Op), Op->getType(), DestTy);
429   }
430 
431   llvm_unreachable("unknown cast resulting in complex value");
432 }
433 
434 ComplexPairTy ComplexExprEmitter::VisitUnaryMinus(const UnaryOperator *E) {
435   TestAndClearIgnoreReal();
436   TestAndClearIgnoreImag();
437   ComplexPairTy Op = Visit(E->getSubExpr());
438 
439   llvm::Value *ResR, *ResI;
440   if (Op.first->getType()->isFloatingPointTy()) {
441     ResR = Builder.CreateFNeg(Op.first,  "neg.r");
442     ResI = Builder.CreateFNeg(Op.second, "neg.i");
443   } else {
444     ResR = Builder.CreateNeg(Op.first,  "neg.r");
445     ResI = Builder.CreateNeg(Op.second, "neg.i");
446   }
447   return ComplexPairTy(ResR, ResI);
448 }
449 
450 ComplexPairTy ComplexExprEmitter::VisitUnaryNot(const UnaryOperator *E) {
451   TestAndClearIgnoreReal();
452   TestAndClearIgnoreImag();
453   // ~(a+ib) = a + i*-b
454   ComplexPairTy Op = Visit(E->getSubExpr());
455   llvm::Value *ResI;
456   if (Op.second->getType()->isFloatingPointTy())
457     ResI = Builder.CreateFNeg(Op.second, "conj.i");
458   else
459     ResI = Builder.CreateNeg(Op.second, "conj.i");
460 
461   return ComplexPairTy(Op.first, ResI);
462 }
463 
464 ComplexPairTy ComplexExprEmitter::EmitBinAdd(const BinOpInfo &Op) {
465   llvm::Value *ResR, *ResI;
466 
467   if (Op.LHS.first->getType()->isFloatingPointTy()) {
468     ResR = Builder.CreateFAdd(Op.LHS.first,  Op.RHS.first,  "add.r");
469     ResI = Builder.CreateFAdd(Op.LHS.second, Op.RHS.second, "add.i");
470   } else {
471     ResR = Builder.CreateAdd(Op.LHS.first,  Op.RHS.first,  "add.r");
472     ResI = Builder.CreateAdd(Op.LHS.second, Op.RHS.second, "add.i");
473   }
474   return ComplexPairTy(ResR, ResI);
475 }
476 
477 ComplexPairTy ComplexExprEmitter::EmitBinSub(const BinOpInfo &Op) {
478   llvm::Value *ResR, *ResI;
479   if (Op.LHS.first->getType()->isFloatingPointTy()) {
480     ResR = Builder.CreateFSub(Op.LHS.first,  Op.RHS.first,  "sub.r");
481     ResI = Builder.CreateFSub(Op.LHS.second, Op.RHS.second, "sub.i");
482   } else {
483     ResR = Builder.CreateSub(Op.LHS.first,  Op.RHS.first,  "sub.r");
484     ResI = Builder.CreateSub(Op.LHS.second, Op.RHS.second, "sub.i");
485   }
486   return ComplexPairTy(ResR, ResI);
487 }
488 
489 
490 ComplexPairTy ComplexExprEmitter::EmitBinMul(const BinOpInfo &Op) {
491   using llvm::Value;
492   Value *ResR, *ResI;
493 
494   if (Op.LHS.first->getType()->isFloatingPointTy()) {
495     Value *ResRl = Builder.CreateFMul(Op.LHS.first, Op.RHS.first, "mul.rl");
496     Value *ResRr = Builder.CreateFMul(Op.LHS.second, Op.RHS.second,"mul.rr");
497     ResR  = Builder.CreateFSub(ResRl, ResRr, "mul.r");
498 
499     Value *ResIl = Builder.CreateFMul(Op.LHS.second, Op.RHS.first, "mul.il");
500     Value *ResIr = Builder.CreateFMul(Op.LHS.first, Op.RHS.second, "mul.ir");
501     ResI  = Builder.CreateFAdd(ResIl, ResIr, "mul.i");
502   } else {
503     Value *ResRl = Builder.CreateMul(Op.LHS.first, Op.RHS.first, "mul.rl");
504     Value *ResRr = Builder.CreateMul(Op.LHS.second, Op.RHS.second,"mul.rr");
505     ResR  = Builder.CreateSub(ResRl, ResRr, "mul.r");
506 
507     Value *ResIl = Builder.CreateMul(Op.LHS.second, Op.RHS.first, "mul.il");
508     Value *ResIr = Builder.CreateMul(Op.LHS.first, Op.RHS.second, "mul.ir");
509     ResI  = Builder.CreateAdd(ResIl, ResIr, "mul.i");
510   }
511   return ComplexPairTy(ResR, ResI);
512 }
513 
514 ComplexPairTy ComplexExprEmitter::EmitBinDiv(const BinOpInfo &Op) {
515   llvm::Value *LHSr = Op.LHS.first, *LHSi = Op.LHS.second;
516   llvm::Value *RHSr = Op.RHS.first, *RHSi = Op.RHS.second;
517 
518 
519   llvm::Value *DSTr, *DSTi;
520   if (Op.LHS.first->getType()->isFloatingPointTy()) {
521     // (a+ib) / (c+id) = ((ac+bd)/(cc+dd)) + i((bc-ad)/(cc+dd))
522     llvm::Value *Tmp1 = Builder.CreateFMul(LHSr, RHSr); // a*c
523     llvm::Value *Tmp2 = Builder.CreateFMul(LHSi, RHSi); // b*d
524     llvm::Value *Tmp3 = Builder.CreateFAdd(Tmp1, Tmp2); // ac+bd
525 
526     llvm::Value *Tmp4 = Builder.CreateFMul(RHSr, RHSr); // c*c
527     llvm::Value *Tmp5 = Builder.CreateFMul(RHSi, RHSi); // d*d
528     llvm::Value *Tmp6 = Builder.CreateFAdd(Tmp4, Tmp5); // cc+dd
529 
530     llvm::Value *Tmp7 = Builder.CreateFMul(LHSi, RHSr); // b*c
531     llvm::Value *Tmp8 = Builder.CreateFMul(LHSr, RHSi); // a*d
532     llvm::Value *Tmp9 = Builder.CreateFSub(Tmp7, Tmp8); // bc-ad
533 
534     DSTr = Builder.CreateFDiv(Tmp3, Tmp6);
535     DSTi = Builder.CreateFDiv(Tmp9, Tmp6);
536   } else {
537     // (a+ib) / (c+id) = ((ac+bd)/(cc+dd)) + i((bc-ad)/(cc+dd))
538     llvm::Value *Tmp1 = Builder.CreateMul(LHSr, RHSr); // a*c
539     llvm::Value *Tmp2 = Builder.CreateMul(LHSi, RHSi); // b*d
540     llvm::Value *Tmp3 = Builder.CreateAdd(Tmp1, Tmp2); // ac+bd
541 
542     llvm::Value *Tmp4 = Builder.CreateMul(RHSr, RHSr); // c*c
543     llvm::Value *Tmp5 = Builder.CreateMul(RHSi, RHSi); // d*d
544     llvm::Value *Tmp6 = Builder.CreateAdd(Tmp4, Tmp5); // cc+dd
545 
546     llvm::Value *Tmp7 = Builder.CreateMul(LHSi, RHSr); // b*c
547     llvm::Value *Tmp8 = Builder.CreateMul(LHSr, RHSi); // a*d
548     llvm::Value *Tmp9 = Builder.CreateSub(Tmp7, Tmp8); // bc-ad
549 
550     if (Op.Ty->getAs<ComplexType>()->getElementType()->isUnsignedIntegerType()) {
551       DSTr = Builder.CreateUDiv(Tmp3, Tmp6);
552       DSTi = Builder.CreateUDiv(Tmp9, Tmp6);
553     } else {
554       DSTr = Builder.CreateSDiv(Tmp3, Tmp6);
555       DSTi = Builder.CreateSDiv(Tmp9, Tmp6);
556     }
557   }
558 
559   return ComplexPairTy(DSTr, DSTi);
560 }
561 
562 ComplexExprEmitter::BinOpInfo
563 ComplexExprEmitter::EmitBinOps(const BinaryOperator *E) {
564   TestAndClearIgnoreReal();
565   TestAndClearIgnoreImag();
566   BinOpInfo Ops;
567   Ops.LHS = Visit(E->getLHS());
568   Ops.RHS = Visit(E->getRHS());
569   Ops.Ty = E->getType();
570   return Ops;
571 }
572 
573 
574 LValue ComplexExprEmitter::
575 EmitCompoundAssignLValue(const CompoundAssignOperator *E,
576           ComplexPairTy (ComplexExprEmitter::*Func)(const BinOpInfo&),
577                          ComplexPairTy &Val) {
578   TestAndClearIgnoreReal();
579   TestAndClearIgnoreImag();
580   QualType LHSTy = E->getLHS()->getType();
581 
582   BinOpInfo OpInfo;
583 
584   // Load the RHS and LHS operands.
585   // __block variables need to have the rhs evaluated first, plus this should
586   // improve codegen a little.
587   OpInfo.Ty = E->getComputationResultType();
588 
589   // The RHS should have been converted to the computation type.
590   assert(OpInfo.Ty->isAnyComplexType());
591   assert(CGF.getContext().hasSameUnqualifiedType(OpInfo.Ty,
592                                                  E->getRHS()->getType()));
593   OpInfo.RHS = Visit(E->getRHS());
594 
595   LValue LHS = CGF.EmitLValue(E->getLHS());
596 
597   // Load from the l-value.
598   ComplexPairTy LHSComplexPair = EmitLoadOfLValue(LHS);
599 
600   OpInfo.LHS = EmitComplexToComplexCast(LHSComplexPair, LHSTy, OpInfo.Ty);
601 
602   // Expand the binary operator.
603   ComplexPairTy Result = (this->*Func)(OpInfo);
604 
605   // Truncate the result back to the LHS type.
606   Result = EmitComplexToComplexCast(Result, OpInfo.Ty, LHSTy);
607   Val = Result;
608 
609   // Store the result value into the LHS lvalue.
610   EmitStoreThroughLValue(Result, LHS);
611 
612   return LHS;
613 }
614 
615 // Compound assignments.
616 ComplexPairTy ComplexExprEmitter::
617 EmitCompoundAssign(const CompoundAssignOperator *E,
618                    ComplexPairTy (ComplexExprEmitter::*Func)(const BinOpInfo&)){
619   ComplexPairTy Val;
620   LValue LV = EmitCompoundAssignLValue(E, Func, Val);
621 
622   // The result of an assignment in C is the assigned r-value.
623   if (!CGF.getContext().getLangOptions().CPlusPlus)
624     return Val;
625 
626   // If the lvalue is non-volatile, return the computed value of the assignment.
627   if (!LV.isVolatileQualified())
628     return Val;
629 
630   return EmitLoadOfComplex(LV.getAddress(), LV.isVolatileQualified());
631 }
632 
633 LValue ComplexExprEmitter::EmitBinAssignLValue(const BinaryOperator *E,
634                                                ComplexPairTy &Val) {
635   assert(CGF.getContext().hasSameUnqualifiedType(E->getLHS()->getType(),
636                                                  E->getRHS()->getType()) &&
637          "Invalid assignment");
638   TestAndClearIgnoreReal();
639   TestAndClearIgnoreImag();
640 
641   // Emit the RHS.  __block variables need the RHS evaluated first.
642   Val = Visit(E->getRHS());
643 
644   // Compute the address to store into.
645   LValue LHS = CGF.EmitLValue(E->getLHS());
646 
647   // Store the result value into the LHS lvalue.
648   EmitStoreThroughLValue(Val, LHS);
649 
650   return LHS;
651 }
652 
653 ComplexPairTy ComplexExprEmitter::VisitBinAssign(const BinaryOperator *E) {
654   ComplexPairTy Val;
655   LValue LV = EmitBinAssignLValue(E, Val);
656 
657   // The result of an assignment in C is the assigned r-value.
658   if (!CGF.getContext().getLangOptions().CPlusPlus)
659     return Val;
660 
661   // If the lvalue is non-volatile, return the computed value of the assignment.
662   if (!LV.isVolatileQualified())
663     return Val;
664 
665   return EmitLoadOfComplex(LV.getAddress(), LV.isVolatileQualified());
666 }
667 
668 ComplexPairTy ComplexExprEmitter::VisitBinComma(const BinaryOperator *E) {
669   CGF.EmitIgnoredExpr(E->getLHS());
670   return Visit(E->getRHS());
671 }
672 
673 ComplexPairTy ComplexExprEmitter::
674 VisitAbstractConditionalOperator(const AbstractConditionalOperator *E) {
675   TestAndClearIgnoreReal();
676   TestAndClearIgnoreImag();
677   llvm::BasicBlock *LHSBlock = CGF.createBasicBlock("cond.true");
678   llvm::BasicBlock *RHSBlock = CGF.createBasicBlock("cond.false");
679   llvm::BasicBlock *ContBlock = CGF.createBasicBlock("cond.end");
680 
681   // Bind the common expression if necessary.
682   CodeGenFunction::OpaqueValueMapping binding(CGF, E);
683 
684   CodeGenFunction::ConditionalEvaluation eval(CGF);
685   CGF.EmitBranchOnBoolExpr(E->getCond(), LHSBlock, RHSBlock);
686 
687   eval.begin(CGF);
688   CGF.EmitBlock(LHSBlock);
689   ComplexPairTy LHS = Visit(E->getTrueExpr());
690   LHSBlock = Builder.GetInsertBlock();
691   CGF.EmitBranch(ContBlock);
692   eval.end(CGF);
693 
694   eval.begin(CGF);
695   CGF.EmitBlock(RHSBlock);
696   ComplexPairTy RHS = Visit(E->getFalseExpr());
697   RHSBlock = Builder.GetInsertBlock();
698   CGF.EmitBlock(ContBlock);
699   eval.end(CGF);
700 
701   // Create a PHI node for the real part.
702   llvm::PHINode *RealPN = Builder.CreatePHI(LHS.first->getType(), 2, "cond.r");
703   RealPN->addIncoming(LHS.first, LHSBlock);
704   RealPN->addIncoming(RHS.first, RHSBlock);
705 
706   // Create a PHI node for the imaginary part.
707   llvm::PHINode *ImagPN = Builder.CreatePHI(LHS.first->getType(), 2, "cond.i");
708   ImagPN->addIncoming(LHS.second, LHSBlock);
709   ImagPN->addIncoming(RHS.second, RHSBlock);
710 
711   return ComplexPairTy(RealPN, ImagPN);
712 }
713 
714 ComplexPairTy ComplexExprEmitter::VisitChooseExpr(ChooseExpr *E) {
715   return Visit(E->getChosenSubExpr(CGF.getContext()));
716 }
717 
718 ComplexPairTy ComplexExprEmitter::VisitInitListExpr(InitListExpr *E) {
719     bool Ignore = TestAndClearIgnoreReal();
720     (void)Ignore;
721     assert (Ignore == false && "init list ignored");
722     Ignore = TestAndClearIgnoreImag();
723     (void)Ignore;
724     assert (Ignore == false && "init list ignored");
725 
726   if (E->getNumInits() == 2) {
727     llvm::Value *Real = CGF.EmitScalarExpr(E->getInit(0));
728     llvm::Value *Imag = CGF.EmitScalarExpr(E->getInit(1));
729     return ComplexPairTy(Real, Imag);
730   } else if (E->getNumInits() == 1) {
731     return Visit(E->getInit(0));
732   }
733 
734   // Empty init list intializes to null
735   assert(E->getNumInits() == 0 && "Unexpected number of inits");
736   QualType Ty = E->getType()->getAs<ComplexType>()->getElementType();
737   llvm::Type* LTy = CGF.ConvertType(Ty);
738   llvm::Value* zeroConstant = llvm::Constant::getNullValue(LTy);
739   return ComplexPairTy(zeroConstant, zeroConstant);
740 }
741 
742 ComplexPairTy ComplexExprEmitter::VisitVAArgExpr(VAArgExpr *E) {
743   llvm::Value *ArgValue = CGF.EmitVAListRef(E->getSubExpr());
744   llvm::Value *ArgPtr = CGF.EmitVAArg(ArgValue, E->getType());
745 
746   if (!ArgPtr) {
747     CGF.ErrorUnsupported(E, "complex va_arg expression");
748     llvm::Type *EltTy =
749       CGF.ConvertType(E->getType()->getAs<ComplexType>()->getElementType());
750     llvm::Value *U = llvm::UndefValue::get(EltTy);
751     return ComplexPairTy(U, U);
752   }
753 
754   // FIXME Volatility.
755   return EmitLoadOfComplex(ArgPtr, false);
756 }
757 
758 //===----------------------------------------------------------------------===//
759 //                         Entry Point into this File
760 //===----------------------------------------------------------------------===//
761 
762 /// EmitComplexExpr - Emit the computation of the specified expression of
763 /// complex type, ignoring the result.
764 ComplexPairTy CodeGenFunction::EmitComplexExpr(const Expr *E, bool IgnoreReal,
765                                                bool IgnoreImag) {
766   assert(E && E->getType()->isAnyComplexType() &&
767          "Invalid complex expression to emit");
768 
769   return ComplexExprEmitter(*this, IgnoreReal, IgnoreImag)
770     .Visit(const_cast<Expr*>(E));
771 }
772 
773 /// EmitComplexExprIntoAddr - Emit the computation of the specified expression
774 /// of complex type, storing into the specified Value*.
775 void CodeGenFunction::EmitComplexExprIntoAddr(const Expr *E,
776                                               llvm::Value *DestAddr,
777                                               bool DestIsVolatile) {
778   assert(E && E->getType()->isAnyComplexType() &&
779          "Invalid complex expression to emit");
780   ComplexExprEmitter Emitter(*this);
781   ComplexPairTy Val = Emitter.Visit(const_cast<Expr*>(E));
782   Emitter.EmitStoreOfComplex(Val, DestAddr, DestIsVolatile);
783 }
784 
785 /// StoreComplexToAddr - Store a complex number into the specified address.
786 void CodeGenFunction::StoreComplexToAddr(ComplexPairTy V,
787                                          llvm::Value *DestAddr,
788                                          bool DestIsVolatile) {
789   ComplexExprEmitter(*this).EmitStoreOfComplex(V, DestAddr, DestIsVolatile);
790 }
791 
792 /// LoadComplexFromAddr - Load a complex number from the specified address.
793 ComplexPairTy CodeGenFunction::LoadComplexFromAddr(llvm::Value *SrcAddr,
794                                                    bool SrcIsVolatile) {
795   return ComplexExprEmitter(*this).EmitLoadOfComplex(SrcAddr, SrcIsVolatile);
796 }
797 
798 LValue CodeGenFunction::EmitComplexAssignmentLValue(const BinaryOperator *E) {
799   assert(E->getOpcode() == BO_Assign);
800   ComplexPairTy Val; // ignored
801   return ComplexExprEmitter(*this).EmitBinAssignLValue(E, Val);
802 }
803 
804 LValue CodeGenFunction::
805 EmitComplexCompoundAssignmentLValue(const CompoundAssignOperator *E) {
806   ComplexPairTy(ComplexExprEmitter::*Op)(const ComplexExprEmitter::BinOpInfo &);
807   switch (E->getOpcode()) {
808   case BO_MulAssign: Op = &ComplexExprEmitter::EmitBinMul; break;
809   case BO_DivAssign: Op = &ComplexExprEmitter::EmitBinDiv; break;
810   case BO_SubAssign: Op = &ComplexExprEmitter::EmitBinSub; break;
811   case BO_AddAssign: Op = &ComplexExprEmitter::EmitBinAdd; break;
812 
813   default:
814     llvm_unreachable("unexpected complex compound assignment");
815     Op = 0;
816   }
817 
818   ComplexPairTy Val; // ignored
819   return ComplexExprEmitter(*this).EmitCompoundAssignLValue(E, Op, Val);
820 }
821