1 //===--- Expr.h - Classes for representing expressions ----------*- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file defines the Expr interface and subclasses.
10 //
11 //===----------------------------------------------------------------------===//
12
13 #ifndef LLVM_CLANG_AST_EXPR_H
14 #define LLVM_CLANG_AST_EXPR_H
15
16 #include "clang/AST/APValue.h"
17 #include "clang/AST/ASTVector.h"
18 #include "clang/AST/ComputeDependence.h"
19 #include "clang/AST/Decl.h"
20 #include "clang/AST/DeclAccessPair.h"
21 #include "clang/AST/DependenceFlags.h"
22 #include "clang/AST/OperationKinds.h"
23 #include "clang/AST/Stmt.h"
24 #include "clang/AST/TemplateBase.h"
25 #include "clang/AST/Type.h"
26 #include "clang/Basic/CharInfo.h"
27 #include "clang/Basic/FixedPoint.h"
28 #include "clang/Basic/LangOptions.h"
29 #include "clang/Basic/SyncScope.h"
30 #include "clang/Basic/TypeTraits.h"
31 #include "llvm/ADT/APFloat.h"
32 #include "llvm/ADT/APSInt.h"
33 #include "llvm/ADT/SmallVector.h"
34 #include "llvm/ADT/StringRef.h"
35 #include "llvm/ADT/iterator.h"
36 #include "llvm/ADT/iterator_range.h"
37 #include "llvm/Support/AtomicOrdering.h"
38 #include "llvm/Support/Compiler.h"
39 #include "llvm/Support/TrailingObjects.h"
40
41 namespace clang {
42 class APValue;
43 class ASTContext;
44 class BlockDecl;
45 class CXXBaseSpecifier;
46 class CXXMemberCallExpr;
47 class CXXOperatorCallExpr;
48 class CastExpr;
49 class Decl;
50 class IdentifierInfo;
51 class MaterializeTemporaryExpr;
52 class NamedDecl;
53 class ObjCPropertyRefExpr;
54 class OpaqueValueExpr;
55 class ParmVarDecl;
56 class StringLiteral;
57 class TargetInfo;
58 class ValueDecl;
59
60 /// A simple array of base specifiers.
61 typedef SmallVector<CXXBaseSpecifier*, 4> CXXCastPath;
62
63 /// An adjustment to be made to the temporary created when emitting a
64 /// reference binding, which accesses a particular subobject of that temporary.
65 struct SubobjectAdjustment {
66 enum {
67 DerivedToBaseAdjustment,
68 FieldAdjustment,
69 MemberPointerAdjustment
70 } Kind;
71
72 struct DTB {
73 const CastExpr *BasePath;
74 const CXXRecordDecl *DerivedClass;
75 };
76
77 struct P {
78 const MemberPointerType *MPT;
79 Expr *RHS;
80 };
81
82 union {
83 struct DTB DerivedToBase;
84 FieldDecl *Field;
85 struct P Ptr;
86 };
87
SubobjectAdjustmentSubobjectAdjustment88 SubobjectAdjustment(const CastExpr *BasePath,
89 const CXXRecordDecl *DerivedClass)
90 : Kind(DerivedToBaseAdjustment) {
91 DerivedToBase.BasePath = BasePath;
92 DerivedToBase.DerivedClass = DerivedClass;
93 }
94
SubobjectAdjustmentSubobjectAdjustment95 SubobjectAdjustment(FieldDecl *Field)
96 : Kind(FieldAdjustment) {
97 this->Field = Field;
98 }
99
SubobjectAdjustmentSubobjectAdjustment100 SubobjectAdjustment(const MemberPointerType *MPT, Expr *RHS)
101 : Kind(MemberPointerAdjustment) {
102 this->Ptr.MPT = MPT;
103 this->Ptr.RHS = RHS;
104 }
105 };
106
107 /// This represents one expression. Note that Expr's are subclasses of Stmt.
108 /// This allows an expression to be transparently used any place a Stmt is
109 /// required.
110 class Expr : public ValueStmt {
111 QualType TR;
112
113 public:
114 Expr() = delete;
115 Expr(const Expr&) = delete;
116 Expr(Expr &&) = delete;
117 Expr &operator=(const Expr&) = delete;
118 Expr &operator=(Expr&&) = delete;
119
120 protected:
Expr(StmtClass SC,QualType T,ExprValueKind VK,ExprObjectKind OK)121 Expr(StmtClass SC, QualType T, ExprValueKind VK, ExprObjectKind OK)
122 : ValueStmt(SC) {
123 ExprBits.Dependent = 0;
124 ExprBits.ValueKind = VK;
125 ExprBits.ObjectKind = OK;
126 assert(ExprBits.ObjectKind == OK && "truncated kind");
127 setType(T);
128 }
129
130 /// Construct an empty expression.
Expr(StmtClass SC,EmptyShell)131 explicit Expr(StmtClass SC, EmptyShell) : ValueStmt(SC) { }
132
133 /// Each concrete expr subclass is expected to compute its dependence and call
134 /// this in the constructor.
setDependence(ExprDependence Deps)135 void setDependence(ExprDependence Deps) {
136 ExprBits.Dependent = static_cast<unsigned>(Deps);
137 }
138 friend class ASTImporter; // Sets dependence dircetly.
139 friend class ASTStmtReader; // Sets dependence dircetly.
140
141 public:
getType()142 QualType getType() const { return TR; }
setType(QualType t)143 void setType(QualType t) {
144 // In C++, the type of an expression is always adjusted so that it
145 // will not have reference type (C++ [expr]p6). Use
146 // QualType::getNonReferenceType() to retrieve the non-reference
147 // type. Additionally, inspect Expr::isLvalue to determine whether
148 // an expression that is adjusted in this manner should be
149 // considered an lvalue.
150 assert((t.isNull() || !t->isReferenceType()) &&
151 "Expressions can't have reference type");
152
153 TR = t;
154 }
155
getDependence()156 ExprDependence getDependence() const {
157 return static_cast<ExprDependence>(ExprBits.Dependent);
158 }
159
160 /// Determines whether the value of this expression depends on
161 /// - a template parameter (C++ [temp.dep.constexpr])
162 /// - or an error, whose resolution is unknown
163 ///
164 /// For example, the array bound of "Chars" in the following example is
165 /// value-dependent.
166 /// @code
167 /// template<int Size, char (&Chars)[Size]> struct meta_string;
168 /// @endcode
isValueDependent()169 bool isValueDependent() const {
170 return static_cast<bool>(getDependence() & ExprDependence::Value);
171 }
172
173 /// Determines whether the type of this expression depends on
174 /// - a template paramter (C++ [temp.dep.expr], which means that its type
175 /// could change from one template instantiation to the next)
176 /// - or an error
177 ///
178 /// For example, the expressions "x" and "x + y" are type-dependent in
179 /// the following code, but "y" is not type-dependent:
180 /// @code
181 /// template<typename T>
182 /// void add(T x, int y) {
183 /// x + y;
184 /// }
185 /// @endcode
isTypeDependent()186 bool isTypeDependent() const {
187 return static_cast<bool>(getDependence() & ExprDependence::Type);
188 }
189
190 /// Whether this expression is instantiation-dependent, meaning that
191 /// it depends in some way on
192 /// - a template parameter (even if neither its type nor (constant) value
193 /// can change due to the template instantiation)
194 /// - or an error
195 ///
196 /// In the following example, the expression \c sizeof(sizeof(T() + T())) is
197 /// instantiation-dependent (since it involves a template parameter \c T), but
198 /// is neither type- nor value-dependent, since the type of the inner
199 /// \c sizeof is known (\c std::size_t) and therefore the size of the outer
200 /// \c sizeof is known.
201 ///
202 /// \code
203 /// template<typename T>
204 /// void f(T x, T y) {
205 /// sizeof(sizeof(T() + T());
206 /// }
207 /// \endcode
208 ///
209 /// \code
210 /// void func(int) {
211 /// func(); // the expression is instantiation-dependent, because it depends
212 /// // on an error.
213 /// }
214 /// \endcode
isInstantiationDependent()215 bool isInstantiationDependent() const {
216 return static_cast<bool>(getDependence() & ExprDependence::Instantiation);
217 }
218
219 /// Whether this expression contains an unexpanded parameter
220 /// pack (for C++11 variadic templates).
221 ///
222 /// Given the following function template:
223 ///
224 /// \code
225 /// template<typename F, typename ...Types>
226 /// void forward(const F &f, Types &&...args) {
227 /// f(static_cast<Types&&>(args)...);
228 /// }
229 /// \endcode
230 ///
231 /// The expressions \c args and \c static_cast<Types&&>(args) both
232 /// contain parameter packs.
containsUnexpandedParameterPack()233 bool containsUnexpandedParameterPack() const {
234 return static_cast<bool>(getDependence() & ExprDependence::UnexpandedPack);
235 }
236
237 /// Whether this expression contains subexpressions which had errors, e.g. a
238 /// TypoExpr.
containsErrors()239 bool containsErrors() const {
240 return static_cast<bool>(getDependence() & ExprDependence::Error);
241 }
242
243 /// getExprLoc - Return the preferred location for the arrow when diagnosing
244 /// a problem with a generic expression.
245 SourceLocation getExprLoc() const LLVM_READONLY;
246
247 /// Determine whether an lvalue-to-rvalue conversion should implicitly be
248 /// applied to this expression if it appears as a discarded-value expression
249 /// in C++11 onwards. This applies to certain forms of volatile glvalues.
250 bool isReadIfDiscardedInCPlusPlus11() const;
251
252 /// isUnusedResultAWarning - Return true if this immediate expression should
253 /// be warned about if the result is unused. If so, fill in expr, location,
254 /// and ranges with expr to warn on and source locations/ranges appropriate
255 /// for a warning.
256 bool isUnusedResultAWarning(const Expr *&WarnExpr, SourceLocation &Loc,
257 SourceRange &R1, SourceRange &R2,
258 ASTContext &Ctx) const;
259
260 /// isLValue - True if this expression is an "l-value" according to
261 /// the rules of the current language. C and C++ give somewhat
262 /// different rules for this concept, but in general, the result of
263 /// an l-value expression identifies a specific object whereas the
264 /// result of an r-value expression is a value detached from any
265 /// specific storage.
266 ///
267 /// C++11 divides the concept of "r-value" into pure r-values
268 /// ("pr-values") and so-called expiring values ("x-values"), which
269 /// identify specific objects that can be safely cannibalized for
270 /// their resources. This is an unfortunate abuse of terminology on
271 /// the part of the C++ committee. In Clang, when we say "r-value",
272 /// we generally mean a pr-value.
isLValue()273 bool isLValue() const { return getValueKind() == VK_LValue; }
isRValue()274 bool isRValue() const { return getValueKind() == VK_RValue; }
isXValue()275 bool isXValue() const { return getValueKind() == VK_XValue; }
isGLValue()276 bool isGLValue() const { return getValueKind() != VK_RValue; }
277
278 enum LValueClassification {
279 LV_Valid,
280 LV_NotObjectType,
281 LV_IncompleteVoidType,
282 LV_DuplicateVectorComponents,
283 LV_InvalidExpression,
284 LV_InvalidMessageExpression,
285 LV_MemberFunction,
286 LV_SubObjCPropertySetting,
287 LV_ClassTemporary,
288 LV_ArrayTemporary
289 };
290 /// Reasons why an expression might not be an l-value.
291 LValueClassification ClassifyLValue(ASTContext &Ctx) const;
292
293 enum isModifiableLvalueResult {
294 MLV_Valid,
295 MLV_NotObjectType,
296 MLV_IncompleteVoidType,
297 MLV_DuplicateVectorComponents,
298 MLV_InvalidExpression,
299 MLV_LValueCast, // Specialized form of MLV_InvalidExpression.
300 MLV_IncompleteType,
301 MLV_ConstQualified,
302 MLV_ConstQualifiedField,
303 MLV_ConstAddrSpace,
304 MLV_ArrayType,
305 MLV_NoSetterProperty,
306 MLV_MemberFunction,
307 MLV_SubObjCPropertySetting,
308 MLV_InvalidMessageExpression,
309 MLV_ClassTemporary,
310 MLV_ArrayTemporary
311 };
312 /// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type,
313 /// does not have an incomplete type, does not have a const-qualified type,
314 /// and if it is a structure or union, does not have any member (including,
315 /// recursively, any member or element of all contained aggregates or unions)
316 /// with a const-qualified type.
317 ///
318 /// \param Loc [in,out] - A source location which *may* be filled
319 /// in with the location of the expression making this a
320 /// non-modifiable lvalue, if specified.
321 isModifiableLvalueResult
322 isModifiableLvalue(ASTContext &Ctx, SourceLocation *Loc = nullptr) const;
323
324 /// The return type of classify(). Represents the C++11 expression
325 /// taxonomy.
326 class Classification {
327 public:
328 /// The various classification results. Most of these mean prvalue.
329 enum Kinds {
330 CL_LValue,
331 CL_XValue,
332 CL_Function, // Functions cannot be lvalues in C.
333 CL_Void, // Void cannot be an lvalue in C.
334 CL_AddressableVoid, // Void expression whose address can be taken in C.
335 CL_DuplicateVectorComponents, // A vector shuffle with dupes.
336 CL_MemberFunction, // An expression referring to a member function
337 CL_SubObjCPropertySetting,
338 CL_ClassTemporary, // A temporary of class type, or subobject thereof.
339 CL_ArrayTemporary, // A temporary of array type.
340 CL_ObjCMessageRValue, // ObjC message is an rvalue
341 CL_PRValue // A prvalue for any other reason, of any other type
342 };
343 /// The results of modification testing.
344 enum ModifiableType {
345 CM_Untested, // testModifiable was false.
346 CM_Modifiable,
347 CM_RValue, // Not modifiable because it's an rvalue
348 CM_Function, // Not modifiable because it's a function; C++ only
349 CM_LValueCast, // Same as CM_RValue, but indicates GCC cast-as-lvalue ext
350 CM_NoSetterProperty,// Implicit assignment to ObjC property without setter
351 CM_ConstQualified,
352 CM_ConstQualifiedField,
353 CM_ConstAddrSpace,
354 CM_ArrayType,
355 CM_IncompleteType
356 };
357
358 private:
359 friend class Expr;
360
361 unsigned short Kind;
362 unsigned short Modifiable;
363
Classification(Kinds k,ModifiableType m)364 explicit Classification(Kinds k, ModifiableType m)
365 : Kind(k), Modifiable(m)
366 {}
367
368 public:
Classification()369 Classification() {}
370
getKind()371 Kinds getKind() const { return static_cast<Kinds>(Kind); }
getModifiable()372 ModifiableType getModifiable() const {
373 assert(Modifiable != CM_Untested && "Did not test for modifiability.");
374 return static_cast<ModifiableType>(Modifiable);
375 }
isLValue()376 bool isLValue() const { return Kind == CL_LValue; }
isXValue()377 bool isXValue() const { return Kind == CL_XValue; }
isGLValue()378 bool isGLValue() const { return Kind <= CL_XValue; }
isPRValue()379 bool isPRValue() const { return Kind >= CL_Function; }
isRValue()380 bool isRValue() const { return Kind >= CL_XValue; }
isModifiable()381 bool isModifiable() const { return getModifiable() == CM_Modifiable; }
382
383 /// Create a simple, modifiably lvalue
makeSimpleLValue()384 static Classification makeSimpleLValue() {
385 return Classification(CL_LValue, CM_Modifiable);
386 }
387
388 };
389 /// Classify - Classify this expression according to the C++11
390 /// expression taxonomy.
391 ///
392 /// C++11 defines ([basic.lval]) a new taxonomy of expressions to replace the
393 /// old lvalue vs rvalue. This function determines the type of expression this
394 /// is. There are three expression types:
395 /// - lvalues are classical lvalues as in C++03.
396 /// - prvalues are equivalent to rvalues in C++03.
397 /// - xvalues are expressions yielding unnamed rvalue references, e.g. a
398 /// function returning an rvalue reference.
399 /// lvalues and xvalues are collectively referred to as glvalues, while
400 /// prvalues and xvalues together form rvalues.
Classify(ASTContext & Ctx)401 Classification Classify(ASTContext &Ctx) const {
402 return ClassifyImpl(Ctx, nullptr);
403 }
404
405 /// ClassifyModifiable - Classify this expression according to the
406 /// C++11 expression taxonomy, and see if it is valid on the left side
407 /// of an assignment.
408 ///
409 /// This function extends classify in that it also tests whether the
410 /// expression is modifiable (C99 6.3.2.1p1).
411 /// \param Loc A source location that might be filled with a relevant location
412 /// if the expression is not modifiable.
ClassifyModifiable(ASTContext & Ctx,SourceLocation & Loc)413 Classification ClassifyModifiable(ASTContext &Ctx, SourceLocation &Loc) const{
414 return ClassifyImpl(Ctx, &Loc);
415 }
416
417 /// getValueKindForType - Given a formal return or parameter type,
418 /// give its value kind.
getValueKindForType(QualType T)419 static ExprValueKind getValueKindForType(QualType T) {
420 if (const ReferenceType *RT = T->getAs<ReferenceType>())
421 return (isa<LValueReferenceType>(RT)
422 ? VK_LValue
423 : (RT->getPointeeType()->isFunctionType()
424 ? VK_LValue : VK_XValue));
425 return VK_RValue;
426 }
427
428 /// getValueKind - The value kind that this expression produces.
getValueKind()429 ExprValueKind getValueKind() const {
430 return static_cast<ExprValueKind>(ExprBits.ValueKind);
431 }
432
433 /// getObjectKind - The object kind that this expression produces.
434 /// Object kinds are meaningful only for expressions that yield an
435 /// l-value or x-value.
getObjectKind()436 ExprObjectKind getObjectKind() const {
437 return static_cast<ExprObjectKind>(ExprBits.ObjectKind);
438 }
439
isOrdinaryOrBitFieldObject()440 bool isOrdinaryOrBitFieldObject() const {
441 ExprObjectKind OK = getObjectKind();
442 return (OK == OK_Ordinary || OK == OK_BitField);
443 }
444
445 /// setValueKind - Set the value kind produced by this expression.
setValueKind(ExprValueKind Cat)446 void setValueKind(ExprValueKind Cat) { ExprBits.ValueKind = Cat; }
447
448 /// setObjectKind - Set the object kind produced by this expression.
setObjectKind(ExprObjectKind Cat)449 void setObjectKind(ExprObjectKind Cat) { ExprBits.ObjectKind = Cat; }
450
451 private:
452 Classification ClassifyImpl(ASTContext &Ctx, SourceLocation *Loc) const;
453
454 public:
455
456 /// Returns true if this expression is a gl-value that
457 /// potentially refers to a bit-field.
458 ///
459 /// In C++, whether a gl-value refers to a bitfield is essentially
460 /// an aspect of the value-kind type system.
refersToBitField()461 bool refersToBitField() const { return getObjectKind() == OK_BitField; }
462
463 /// If this expression refers to a bit-field, retrieve the
464 /// declaration of that bit-field.
465 ///
466 /// Note that this returns a non-null pointer in subtly different
467 /// places than refersToBitField returns true. In particular, this can
468 /// return a non-null pointer even for r-values loaded from
469 /// bit-fields, but it will return null for a conditional bit-field.
470 FieldDecl *getSourceBitField();
471
getSourceBitField()472 const FieldDecl *getSourceBitField() const {
473 return const_cast<Expr*>(this)->getSourceBitField();
474 }
475
476 Decl *getReferencedDeclOfCallee();
getReferencedDeclOfCallee()477 const Decl *getReferencedDeclOfCallee() const {
478 return const_cast<Expr*>(this)->getReferencedDeclOfCallee();
479 }
480
481 /// If this expression is an l-value for an Objective C
482 /// property, find the underlying property reference expression.
483 const ObjCPropertyRefExpr *getObjCProperty() const;
484
485 /// Check if this expression is the ObjC 'self' implicit parameter.
486 bool isObjCSelfExpr() const;
487
488 /// Returns whether this expression refers to a vector element.
489 bool refersToVectorElement() const;
490
491 /// Returns whether this expression refers to a matrix element.
refersToMatrixElement()492 bool refersToMatrixElement() const {
493 return getObjectKind() == OK_MatrixComponent;
494 }
495
496 /// Returns whether this expression refers to a global register
497 /// variable.
498 bool refersToGlobalRegisterVar() const;
499
500 /// Returns whether this expression has a placeholder type.
hasPlaceholderType()501 bool hasPlaceholderType() const {
502 return getType()->isPlaceholderType();
503 }
504
505 /// Returns whether this expression has a specific placeholder type.
hasPlaceholderType(BuiltinType::Kind K)506 bool hasPlaceholderType(BuiltinType::Kind K) const {
507 assert(BuiltinType::isPlaceholderTypeKind(K));
508 if (const BuiltinType *BT = dyn_cast<BuiltinType>(getType()))
509 return BT->getKind() == K;
510 return false;
511 }
512
513 /// isKnownToHaveBooleanValue - Return true if this is an integer expression
514 /// that is known to return 0 or 1. This happens for _Bool/bool expressions
515 /// but also int expressions which are produced by things like comparisons in
516 /// C.
517 ///
518 /// \param Semantic If true, only return true for expressions that are known
519 /// to be semantically boolean, which might not be true even for expressions
520 /// that are known to evaluate to 0/1. For instance, reading an unsigned
521 /// bit-field with width '1' will evaluate to 0/1, but doesn't necessarily
522 /// semantically correspond to a bool.
523 bool isKnownToHaveBooleanValue(bool Semantic = true) const;
524
525 /// isIntegerConstantExpr - Return true if this expression is a valid integer
526 /// constant expression, and, if so, return its value in Result. If not a
527 /// valid i-c-e, return false and fill in Loc (if specified) with the location
528 /// of the invalid expression.
529 ///
530 /// Note: This does not perform the implicit conversions required by C++11
531 /// [expr.const]p5.
532 bool isIntegerConstantExpr(llvm::APSInt &Result, const ASTContext &Ctx,
533 SourceLocation *Loc = nullptr,
534 bool isEvaluated = true) const;
535 bool isIntegerConstantExpr(const ASTContext &Ctx,
536 SourceLocation *Loc = nullptr) const;
537
538 /// isCXX98IntegralConstantExpr - Return true if this expression is an
539 /// integral constant expression in C++98. Can only be used in C++.
540 bool isCXX98IntegralConstantExpr(const ASTContext &Ctx) const;
541
542 /// isCXX11ConstantExpr - Return true if this expression is a constant
543 /// expression in C++11. Can only be used in C++.
544 ///
545 /// Note: This does not perform the implicit conversions required by C++11
546 /// [expr.const]p5.
547 bool isCXX11ConstantExpr(const ASTContext &Ctx, APValue *Result = nullptr,
548 SourceLocation *Loc = nullptr) const;
549
550 /// isPotentialConstantExpr - Return true if this function's definition
551 /// might be usable in a constant expression in C++11, if it were marked
552 /// constexpr. Return false if the function can never produce a constant
553 /// expression, along with diagnostics describing why not.
554 static bool isPotentialConstantExpr(const FunctionDecl *FD,
555 SmallVectorImpl<
556 PartialDiagnosticAt> &Diags);
557
558 /// isPotentialConstantExprUnevaluted - Return true if this expression might
559 /// be usable in a constant expression in C++11 in an unevaluated context, if
560 /// it were in function FD marked constexpr. Return false if the function can
561 /// never produce a constant expression, along with diagnostics describing
562 /// why not.
563 static bool isPotentialConstantExprUnevaluated(Expr *E,
564 const FunctionDecl *FD,
565 SmallVectorImpl<
566 PartialDiagnosticAt> &Diags);
567
568 /// isConstantInitializer - Returns true if this expression can be emitted to
569 /// IR as a constant, and thus can be used as a constant initializer in C.
570 /// If this expression is not constant and Culprit is non-null,
571 /// it is used to store the address of first non constant expr.
572 bool isConstantInitializer(ASTContext &Ctx, bool ForRef,
573 const Expr **Culprit = nullptr) const;
574
575 /// EvalStatus is a struct with detailed info about an evaluation in progress.
576 struct EvalStatus {
577 /// Whether the evaluated expression has side effects.
578 /// For example, (f() && 0) can be folded, but it still has side effects.
579 bool HasSideEffects;
580
581 /// Whether the evaluation hit undefined behavior.
582 /// For example, 1.0 / 0.0 can be folded to Inf, but has undefined behavior.
583 /// Likewise, INT_MAX + 1 can be folded to INT_MIN, but has UB.
584 bool HasUndefinedBehavior;
585
586 /// Diag - If this is non-null, it will be filled in with a stack of notes
587 /// indicating why evaluation failed (or why it failed to produce a constant
588 /// expression).
589 /// If the expression is unfoldable, the notes will indicate why it's not
590 /// foldable. If the expression is foldable, but not a constant expression,
591 /// the notes will describes why it isn't a constant expression. If the
592 /// expression *is* a constant expression, no notes will be produced.
593 SmallVectorImpl<PartialDiagnosticAt> *Diag;
594
EvalStatusEvalStatus595 EvalStatus()
596 : HasSideEffects(false), HasUndefinedBehavior(false), Diag(nullptr) {}
597
598 // hasSideEffects - Return true if the evaluated expression has
599 // side effects.
hasSideEffectsEvalStatus600 bool hasSideEffects() const {
601 return HasSideEffects;
602 }
603 };
604
605 /// EvalResult is a struct with detailed info about an evaluated expression.
606 struct EvalResult : EvalStatus {
607 /// Val - This is the value the expression can be folded to.
608 APValue Val;
609
610 // isGlobalLValue - Return true if the evaluated lvalue expression
611 // is global.
612 bool isGlobalLValue() const;
613 };
614
615 /// EvaluateAsRValue - Return true if this is a constant which we can fold to
616 /// an rvalue using any crazy technique (that has nothing to do with language
617 /// standards) that we want to, even if the expression has side-effects. If
618 /// this function returns true, it returns the folded constant in Result. If
619 /// the expression is a glvalue, an lvalue-to-rvalue conversion will be
620 /// applied.
621 bool EvaluateAsRValue(EvalResult &Result, const ASTContext &Ctx,
622 bool InConstantContext = false) const;
623
624 /// EvaluateAsBooleanCondition - Return true if this is a constant
625 /// which we can fold and convert to a boolean condition using
626 /// any crazy technique that we want to, even if the expression has
627 /// side-effects.
628 bool EvaluateAsBooleanCondition(bool &Result, const ASTContext &Ctx,
629 bool InConstantContext = false) const;
630
631 enum SideEffectsKind {
632 SE_NoSideEffects, ///< Strictly evaluate the expression.
633 SE_AllowUndefinedBehavior, ///< Allow UB that we can give a value, but not
634 ///< arbitrary unmodeled side effects.
635 SE_AllowSideEffects ///< Allow any unmodeled side effect.
636 };
637
638 /// EvaluateAsInt - Return true if this is a constant which we can fold and
639 /// convert to an integer, using any crazy technique that we want to.
640 bool EvaluateAsInt(EvalResult &Result, const ASTContext &Ctx,
641 SideEffectsKind AllowSideEffects = SE_NoSideEffects,
642 bool InConstantContext = false) const;
643
644 /// EvaluateAsFloat - Return true if this is a constant which we can fold and
645 /// convert to a floating point value, using any crazy technique that we
646 /// want to.
647 bool EvaluateAsFloat(llvm::APFloat &Result, const ASTContext &Ctx,
648 SideEffectsKind AllowSideEffects = SE_NoSideEffects,
649 bool InConstantContext = false) const;
650
651 /// EvaluateAsFloat - Return true if this is a constant which we can fold and
652 /// convert to a fixed point value.
653 bool EvaluateAsFixedPoint(EvalResult &Result, const ASTContext &Ctx,
654 SideEffectsKind AllowSideEffects = SE_NoSideEffects,
655 bool InConstantContext = false) const;
656
657 /// isEvaluatable - Call EvaluateAsRValue to see if this expression can be
658 /// constant folded without side-effects, but discard the result.
659 bool isEvaluatable(const ASTContext &Ctx,
660 SideEffectsKind AllowSideEffects = SE_NoSideEffects) const;
661
662 /// HasSideEffects - This routine returns true for all those expressions
663 /// which have any effect other than producing a value. Example is a function
664 /// call, volatile variable read, or throwing an exception. If
665 /// IncludePossibleEffects is false, this call treats certain expressions with
666 /// potential side effects (such as function call-like expressions,
667 /// instantiation-dependent expressions, or invocations from a macro) as not
668 /// having side effects.
669 bool HasSideEffects(const ASTContext &Ctx,
670 bool IncludePossibleEffects = true) const;
671
672 /// Determine whether this expression involves a call to any function
673 /// that is not trivial.
674 bool hasNonTrivialCall(const ASTContext &Ctx) const;
675
676 /// EvaluateKnownConstInt - Call EvaluateAsRValue and return the folded
677 /// integer. This must be called on an expression that constant folds to an
678 /// integer.
679 llvm::APSInt EvaluateKnownConstInt(
680 const ASTContext &Ctx,
681 SmallVectorImpl<PartialDiagnosticAt> *Diag = nullptr) const;
682
683 llvm::APSInt EvaluateKnownConstIntCheckOverflow(
684 const ASTContext &Ctx,
685 SmallVectorImpl<PartialDiagnosticAt> *Diag = nullptr) const;
686
687 void EvaluateForOverflow(const ASTContext &Ctx) const;
688
689 /// EvaluateAsLValue - Evaluate an expression to see if we can fold it to an
690 /// lvalue with link time known address, with no side-effects.
691 bool EvaluateAsLValue(EvalResult &Result, const ASTContext &Ctx,
692 bool InConstantContext = false) const;
693
694 /// EvaluateAsInitializer - Evaluate an expression as if it were the
695 /// initializer of the given declaration. Returns true if the initializer
696 /// can be folded to a constant, and produces any relevant notes. In C++11,
697 /// notes will be produced if the expression is not a constant expression.
698 bool EvaluateAsInitializer(APValue &Result, const ASTContext &Ctx,
699 const VarDecl *VD,
700 SmallVectorImpl<PartialDiagnosticAt> &Notes) const;
701
702 /// EvaluateWithSubstitution - Evaluate an expression as if from the context
703 /// of a call to the given function with the given arguments, inside an
704 /// unevaluated context. Returns true if the expression could be folded to a
705 /// constant.
706 bool EvaluateWithSubstitution(APValue &Value, ASTContext &Ctx,
707 const FunctionDecl *Callee,
708 ArrayRef<const Expr*> Args,
709 const Expr *This = nullptr) const;
710
711 /// Indicates how the constant expression will be used.
712 enum ConstExprUsage { EvaluateForCodeGen, EvaluateForMangling };
713
714 /// Evaluate an expression that is required to be a constant expression.
715 bool EvaluateAsConstantExpr(EvalResult &Result, ConstExprUsage Usage,
716 const ASTContext &Ctx,
717 bool InPlace = false) const;
718
719 /// If the current Expr is a pointer, this will try to statically
720 /// determine the number of bytes available where the pointer is pointing.
721 /// Returns true if all of the above holds and we were able to figure out the
722 /// size, false otherwise.
723 ///
724 /// \param Type - How to evaluate the size of the Expr, as defined by the
725 /// "type" parameter of __builtin_object_size
726 bool tryEvaluateObjectSize(uint64_t &Result, ASTContext &Ctx,
727 unsigned Type) const;
728
729 /// Enumeration used to describe the kind of Null pointer constant
730 /// returned from \c isNullPointerConstant().
731 enum NullPointerConstantKind {
732 /// Expression is not a Null pointer constant.
733 NPCK_NotNull = 0,
734
735 /// Expression is a Null pointer constant built from a zero integer
736 /// expression that is not a simple, possibly parenthesized, zero literal.
737 /// C++ Core Issue 903 will classify these expressions as "not pointers"
738 /// once it is adopted.
739 /// http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#903
740 NPCK_ZeroExpression,
741
742 /// Expression is a Null pointer constant built from a literal zero.
743 NPCK_ZeroLiteral,
744
745 /// Expression is a C++11 nullptr.
746 NPCK_CXX11_nullptr,
747
748 /// Expression is a GNU-style __null constant.
749 NPCK_GNUNull
750 };
751
752 /// Enumeration used to describe how \c isNullPointerConstant()
753 /// should cope with value-dependent expressions.
754 enum NullPointerConstantValueDependence {
755 /// Specifies that the expression should never be value-dependent.
756 NPC_NeverValueDependent = 0,
757
758 /// Specifies that a value-dependent expression of integral or
759 /// dependent type should be considered a null pointer constant.
760 NPC_ValueDependentIsNull,
761
762 /// Specifies that a value-dependent expression should be considered
763 /// to never be a null pointer constant.
764 NPC_ValueDependentIsNotNull
765 };
766
767 /// isNullPointerConstant - C99 6.3.2.3p3 - Test if this reduces down to
768 /// a Null pointer constant. The return value can further distinguish the
769 /// kind of NULL pointer constant that was detected.
770 NullPointerConstantKind isNullPointerConstant(
771 ASTContext &Ctx,
772 NullPointerConstantValueDependence NPC) const;
773
774 /// isOBJCGCCandidate - Return true if this expression may be used in a read/
775 /// write barrier.
776 bool isOBJCGCCandidate(ASTContext &Ctx) const;
777
778 /// Returns true if this expression is a bound member function.
779 bool isBoundMemberFunction(ASTContext &Ctx) const;
780
781 /// Given an expression of bound-member type, find the type
782 /// of the member. Returns null if this is an *overloaded* bound
783 /// member expression.
784 static QualType findBoundMemberType(const Expr *expr);
785
786 /// Skip past any invisble AST nodes which might surround this
787 /// statement, such as ExprWithCleanups or ImplicitCastExpr nodes,
788 /// but also injected CXXMemberExpr and CXXConstructExpr which represent
789 /// implicit conversions.
790 Expr *IgnoreUnlessSpelledInSource();
IgnoreUnlessSpelledInSource()791 const Expr *IgnoreUnlessSpelledInSource() const {
792 return const_cast<Expr *>(this)->IgnoreUnlessSpelledInSource();
793 }
794
795 /// Skip past any implicit casts which might surround this expression until
796 /// reaching a fixed point. Skips:
797 /// * ImplicitCastExpr
798 /// * FullExpr
799 Expr *IgnoreImpCasts() LLVM_READONLY;
IgnoreImpCasts()800 const Expr *IgnoreImpCasts() const {
801 return const_cast<Expr *>(this)->IgnoreImpCasts();
802 }
803
804 /// Skip past any casts which might surround this expression until reaching
805 /// a fixed point. Skips:
806 /// * CastExpr
807 /// * FullExpr
808 /// * MaterializeTemporaryExpr
809 /// * SubstNonTypeTemplateParmExpr
810 Expr *IgnoreCasts() LLVM_READONLY;
IgnoreCasts()811 const Expr *IgnoreCasts() const {
812 return const_cast<Expr *>(this)->IgnoreCasts();
813 }
814
815 /// Skip past any implicit AST nodes which might surround this expression
816 /// until reaching a fixed point. Skips:
817 /// * What IgnoreImpCasts() skips
818 /// * MaterializeTemporaryExpr
819 /// * CXXBindTemporaryExpr
820 Expr *IgnoreImplicit() LLVM_READONLY;
IgnoreImplicit()821 const Expr *IgnoreImplicit() const {
822 return const_cast<Expr *>(this)->IgnoreImplicit();
823 }
824
825 /// Skip past any implicit AST nodes which might surround this expression
826 /// until reaching a fixed point. Same as IgnoreImplicit, except that it
827 /// also skips over implicit calls to constructors and conversion functions.
828 ///
829 /// FIXME: Should IgnoreImplicit do this?
830 Expr *IgnoreImplicitAsWritten() LLVM_READONLY;
IgnoreImplicitAsWritten()831 const Expr *IgnoreImplicitAsWritten() const {
832 return const_cast<Expr *>(this)->IgnoreImplicitAsWritten();
833 }
834
835 /// Skip past any parentheses which might surround this expression until
836 /// reaching a fixed point. Skips:
837 /// * ParenExpr
838 /// * UnaryOperator if `UO_Extension`
839 /// * GenericSelectionExpr if `!isResultDependent()`
840 /// * ChooseExpr if `!isConditionDependent()`
841 /// * ConstantExpr
842 Expr *IgnoreParens() LLVM_READONLY;
IgnoreParens()843 const Expr *IgnoreParens() const {
844 return const_cast<Expr *>(this)->IgnoreParens();
845 }
846
847 /// Skip past any parentheses and implicit casts which might surround this
848 /// expression until reaching a fixed point.
849 /// FIXME: IgnoreParenImpCasts really ought to be equivalent to
850 /// IgnoreParens() + IgnoreImpCasts() until reaching a fixed point. However
851 /// this is currently not the case. Instead IgnoreParenImpCasts() skips:
852 /// * What IgnoreParens() skips
853 /// * What IgnoreImpCasts() skips
854 /// * MaterializeTemporaryExpr
855 /// * SubstNonTypeTemplateParmExpr
856 Expr *IgnoreParenImpCasts() LLVM_READONLY;
IgnoreParenImpCasts()857 const Expr *IgnoreParenImpCasts() const {
858 return const_cast<Expr *>(this)->IgnoreParenImpCasts();
859 }
860
861 /// Skip past any parentheses and casts which might surround this expression
862 /// until reaching a fixed point. Skips:
863 /// * What IgnoreParens() skips
864 /// * What IgnoreCasts() skips
865 Expr *IgnoreParenCasts() LLVM_READONLY;
IgnoreParenCasts()866 const Expr *IgnoreParenCasts() const {
867 return const_cast<Expr *>(this)->IgnoreParenCasts();
868 }
869
870 /// Skip conversion operators. If this Expr is a call to a conversion
871 /// operator, return the argument.
872 Expr *IgnoreConversionOperator() LLVM_READONLY;
IgnoreConversionOperator()873 const Expr *IgnoreConversionOperator() const {
874 return const_cast<Expr *>(this)->IgnoreConversionOperator();
875 }
876
877 /// Skip past any parentheses and lvalue casts which might surround this
878 /// expression until reaching a fixed point. Skips:
879 /// * What IgnoreParens() skips
880 /// * What IgnoreCasts() skips, except that only lvalue-to-rvalue
881 /// casts are skipped
882 /// FIXME: This is intended purely as a temporary workaround for code
883 /// that hasn't yet been rewritten to do the right thing about those
884 /// casts, and may disappear along with the last internal use.
885 Expr *IgnoreParenLValueCasts() LLVM_READONLY;
IgnoreParenLValueCasts()886 const Expr *IgnoreParenLValueCasts() const {
887 return const_cast<Expr *>(this)->IgnoreParenLValueCasts();
888 }
889
890 /// Skip past any parenthese and casts which do not change the value
891 /// (including ptr->int casts of the same size) until reaching a fixed point.
892 /// Skips:
893 /// * What IgnoreParens() skips
894 /// * CastExpr which do not change the value
895 /// * SubstNonTypeTemplateParmExpr
896 Expr *IgnoreParenNoopCasts(const ASTContext &Ctx) LLVM_READONLY;
IgnoreParenNoopCasts(const ASTContext & Ctx)897 const Expr *IgnoreParenNoopCasts(const ASTContext &Ctx) const {
898 return const_cast<Expr *>(this)->IgnoreParenNoopCasts(Ctx);
899 }
900
901 /// Skip past any parentheses and derived-to-base casts until reaching a
902 /// fixed point. Skips:
903 /// * What IgnoreParens() skips
904 /// * CastExpr which represent a derived-to-base cast (CK_DerivedToBase,
905 /// CK_UncheckedDerivedToBase and CK_NoOp)
906 Expr *ignoreParenBaseCasts() LLVM_READONLY;
ignoreParenBaseCasts()907 const Expr *ignoreParenBaseCasts() const {
908 return const_cast<Expr *>(this)->ignoreParenBaseCasts();
909 }
910
911 /// Determine whether this expression is a default function argument.
912 ///
913 /// Default arguments are implicitly generated in the abstract syntax tree
914 /// by semantic analysis for function calls, object constructions, etc. in
915 /// C++. Default arguments are represented by \c CXXDefaultArgExpr nodes;
916 /// this routine also looks through any implicit casts to determine whether
917 /// the expression is a default argument.
918 bool isDefaultArgument() const;
919
920 /// Determine whether the result of this expression is a
921 /// temporary object of the given class type.
922 bool isTemporaryObject(ASTContext &Ctx, const CXXRecordDecl *TempTy) const;
923
924 /// Whether this expression is an implicit reference to 'this' in C++.
925 bool isImplicitCXXThis() const;
926
927 static bool hasAnyTypeDependentArguments(ArrayRef<Expr *> Exprs);
928
929 /// For an expression of class type or pointer to class type,
930 /// return the most derived class decl the expression is known to refer to.
931 ///
932 /// If this expression is a cast, this method looks through it to find the
933 /// most derived decl that can be inferred from the expression.
934 /// This is valid because derived-to-base conversions have undefined
935 /// behavior if the object isn't dynamically of the derived type.
936 const CXXRecordDecl *getBestDynamicClassType() const;
937
938 /// Get the inner expression that determines the best dynamic class.
939 /// If this is a prvalue, we guarantee that it is of the most-derived type
940 /// for the object itself.
941 const Expr *getBestDynamicClassTypeExpr() const;
942
943 /// Walk outwards from an expression we want to bind a reference to and
944 /// find the expression whose lifetime needs to be extended. Record
945 /// the LHSs of comma expressions and adjustments needed along the path.
946 const Expr *skipRValueSubobjectAdjustments(
947 SmallVectorImpl<const Expr *> &CommaLHS,
948 SmallVectorImpl<SubobjectAdjustment> &Adjustments) const;
skipRValueSubobjectAdjustments()949 const Expr *skipRValueSubobjectAdjustments() const {
950 SmallVector<const Expr *, 8> CommaLHSs;
951 SmallVector<SubobjectAdjustment, 8> Adjustments;
952 return skipRValueSubobjectAdjustments(CommaLHSs, Adjustments);
953 }
954
955 /// Checks that the two Expr's will refer to the same value as a comparison
956 /// operand. The caller must ensure that the values referenced by the Expr's
957 /// are not modified between E1 and E2 or the result my be invalid.
958 static bool isSameComparisonOperand(const Expr* E1, const Expr* E2);
959
classof(const Stmt * T)960 static bool classof(const Stmt *T) {
961 return T->getStmtClass() >= firstExprConstant &&
962 T->getStmtClass() <= lastExprConstant;
963 }
964 };
965
966 //===----------------------------------------------------------------------===//
967 // Wrapper Expressions.
968 //===----------------------------------------------------------------------===//
969
970 /// FullExpr - Represents a "full-expression" node.
971 class FullExpr : public Expr {
972 protected:
973 Stmt *SubExpr;
974
FullExpr(StmtClass SC,Expr * subexpr)975 FullExpr(StmtClass SC, Expr *subexpr)
976 : Expr(SC, subexpr->getType(), subexpr->getValueKind(),
977 subexpr->getObjectKind()),
978 SubExpr(subexpr) {
979 setDependence(computeDependence(this));
980 }
FullExpr(StmtClass SC,EmptyShell Empty)981 FullExpr(StmtClass SC, EmptyShell Empty)
982 : Expr(SC, Empty) {}
983 public:
getSubExpr()984 const Expr *getSubExpr() const { return cast<Expr>(SubExpr); }
getSubExpr()985 Expr *getSubExpr() { return cast<Expr>(SubExpr); }
986
987 /// As with any mutator of the AST, be very careful when modifying an
988 /// existing AST to preserve its invariants.
setSubExpr(Expr * E)989 void setSubExpr(Expr *E) { SubExpr = E; }
990
classof(const Stmt * T)991 static bool classof(const Stmt *T) {
992 return T->getStmtClass() >= firstFullExprConstant &&
993 T->getStmtClass() <= lastFullExprConstant;
994 }
995 };
996
997 /// ConstantExpr - An expression that occurs in a constant context and
998 /// optionally the result of evaluating the expression.
999 class ConstantExpr final
1000 : public FullExpr,
1001 private llvm::TrailingObjects<ConstantExpr, APValue, uint64_t> {
1002 static_assert(std::is_same<uint64_t, llvm::APInt::WordType>::value,
1003 "ConstantExpr assumes that llvm::APInt::WordType is uint64_t "
1004 "for tail-allocated storage");
1005 friend TrailingObjects;
1006 friend class ASTStmtReader;
1007 friend class ASTStmtWriter;
1008
1009 public:
1010 /// Describes the kind of result that can be tail-allocated.
1011 enum ResultStorageKind { RSK_None, RSK_Int64, RSK_APValue };
1012
1013 private:
numTrailingObjects(OverloadToken<APValue>)1014 size_t numTrailingObjects(OverloadToken<APValue>) const {
1015 return ConstantExprBits.ResultKind == ConstantExpr::RSK_APValue;
1016 }
numTrailingObjects(OverloadToken<uint64_t>)1017 size_t numTrailingObjects(OverloadToken<uint64_t>) const {
1018 return ConstantExprBits.ResultKind == ConstantExpr::RSK_Int64;
1019 }
1020
Int64Result()1021 uint64_t &Int64Result() {
1022 assert(ConstantExprBits.ResultKind == ConstantExpr::RSK_Int64 &&
1023 "invalid accessor");
1024 return *getTrailingObjects<uint64_t>();
1025 }
Int64Result()1026 const uint64_t &Int64Result() const {
1027 return const_cast<ConstantExpr *>(this)->Int64Result();
1028 }
APValueResult()1029 APValue &APValueResult() {
1030 assert(ConstantExprBits.ResultKind == ConstantExpr::RSK_APValue &&
1031 "invalid accessor");
1032 return *getTrailingObjects<APValue>();
1033 }
APValueResult()1034 APValue &APValueResult() const {
1035 return const_cast<ConstantExpr *>(this)->APValueResult();
1036 }
1037
1038 ConstantExpr(Expr *SubExpr, ResultStorageKind StorageKind,
1039 bool IsImmediateInvocation);
1040 ConstantExpr(EmptyShell Empty, ResultStorageKind StorageKind);
1041
1042 public:
1043 static ConstantExpr *Create(const ASTContext &Context, Expr *E,
1044 const APValue &Result);
1045 static ConstantExpr *Create(const ASTContext &Context, Expr *E,
1046 ResultStorageKind Storage = RSK_None,
1047 bool IsImmediateInvocation = false);
1048 static ConstantExpr *CreateEmpty(const ASTContext &Context,
1049 ResultStorageKind StorageKind);
1050
1051 static ResultStorageKind getStorageKind(const APValue &Value);
1052 static ResultStorageKind getStorageKind(const Type *T,
1053 const ASTContext &Context);
1054
getBeginLoc()1055 SourceLocation getBeginLoc() const LLVM_READONLY {
1056 return SubExpr->getBeginLoc();
1057 }
getEndLoc()1058 SourceLocation getEndLoc() const LLVM_READONLY {
1059 return SubExpr->getEndLoc();
1060 }
1061
classof(const Stmt * T)1062 static bool classof(const Stmt *T) {
1063 return T->getStmtClass() == ConstantExprClass;
1064 }
1065
SetResult(APValue Value,const ASTContext & Context)1066 void SetResult(APValue Value, const ASTContext &Context) {
1067 MoveIntoResult(Value, Context);
1068 }
1069 void MoveIntoResult(APValue &Value, const ASTContext &Context);
1070
getResultAPValueKind()1071 APValue::ValueKind getResultAPValueKind() const {
1072 return static_cast<APValue::ValueKind>(ConstantExprBits.APValueKind);
1073 }
getResultStorageKind()1074 ResultStorageKind getResultStorageKind() const {
1075 return static_cast<ResultStorageKind>(ConstantExprBits.ResultKind);
1076 }
isImmediateInvocation()1077 bool isImmediateInvocation() const {
1078 return ConstantExprBits.IsImmediateInvocation;
1079 }
hasAPValueResult()1080 bool hasAPValueResult() const {
1081 return ConstantExprBits.APValueKind != APValue::None;
1082 }
1083 APValue getAPValueResult() const;
getResultAsAPValue()1084 APValue &getResultAsAPValue() const { return APValueResult(); }
1085 llvm::APSInt getResultAsAPSInt() const;
1086 // Iterators
children()1087 child_range children() { return child_range(&SubExpr, &SubExpr+1); }
children()1088 const_child_range children() const {
1089 return const_child_range(&SubExpr, &SubExpr + 1);
1090 }
1091 };
1092
1093 //===----------------------------------------------------------------------===//
1094 // Primary Expressions.
1095 //===----------------------------------------------------------------------===//
1096
1097 /// OpaqueValueExpr - An expression referring to an opaque object of a
1098 /// fixed type and value class. These don't correspond to concrete
1099 /// syntax; instead they're used to express operations (usually copy
1100 /// operations) on values whose source is generally obvious from
1101 /// context.
1102 class OpaqueValueExpr : public Expr {
1103 friend class ASTStmtReader;
1104 Expr *SourceExpr;
1105
1106 public:
1107 OpaqueValueExpr(SourceLocation Loc, QualType T, ExprValueKind VK,
1108 ExprObjectKind OK = OK_Ordinary, Expr *SourceExpr = nullptr)
Expr(OpaqueValueExprClass,T,VK,OK)1109 : Expr(OpaqueValueExprClass, T, VK, OK), SourceExpr(SourceExpr) {
1110 setIsUnique(false);
1111 OpaqueValueExprBits.Loc = Loc;
1112 setDependence(computeDependence(this));
1113 }
1114
1115 /// Given an expression which invokes a copy constructor --- i.e. a
1116 /// CXXConstructExpr, possibly wrapped in an ExprWithCleanups ---
1117 /// find the OpaqueValueExpr that's the source of the construction.
1118 static const OpaqueValueExpr *findInCopyConstruct(const Expr *expr);
1119
OpaqueValueExpr(EmptyShell Empty)1120 explicit OpaqueValueExpr(EmptyShell Empty)
1121 : Expr(OpaqueValueExprClass, Empty) {}
1122
1123 /// Retrieve the location of this expression.
getLocation()1124 SourceLocation getLocation() const { return OpaqueValueExprBits.Loc; }
1125
getBeginLoc()1126 SourceLocation getBeginLoc() const LLVM_READONLY {
1127 return SourceExpr ? SourceExpr->getBeginLoc() : getLocation();
1128 }
getEndLoc()1129 SourceLocation getEndLoc() const LLVM_READONLY {
1130 return SourceExpr ? SourceExpr->getEndLoc() : getLocation();
1131 }
getExprLoc()1132 SourceLocation getExprLoc() const LLVM_READONLY {
1133 return SourceExpr ? SourceExpr->getExprLoc() : getLocation();
1134 }
1135
children()1136 child_range children() {
1137 return child_range(child_iterator(), child_iterator());
1138 }
1139
children()1140 const_child_range children() const {
1141 return const_child_range(const_child_iterator(), const_child_iterator());
1142 }
1143
1144 /// The source expression of an opaque value expression is the
1145 /// expression which originally generated the value. This is
1146 /// provided as a convenience for analyses that don't wish to
1147 /// precisely model the execution behavior of the program.
1148 ///
1149 /// The source expression is typically set when building the
1150 /// expression which binds the opaque value expression in the first
1151 /// place.
getSourceExpr()1152 Expr *getSourceExpr() const { return SourceExpr; }
1153
setIsUnique(bool V)1154 void setIsUnique(bool V) {
1155 assert((!V || SourceExpr) &&
1156 "unique OVEs are expected to have source expressions");
1157 OpaqueValueExprBits.IsUnique = V;
1158 }
1159
isUnique()1160 bool isUnique() const { return OpaqueValueExprBits.IsUnique; }
1161
classof(const Stmt * T)1162 static bool classof(const Stmt *T) {
1163 return T->getStmtClass() == OpaqueValueExprClass;
1164 }
1165 };
1166
1167 /// A reference to a declared variable, function, enum, etc.
1168 /// [C99 6.5.1p2]
1169 ///
1170 /// This encodes all the information about how a declaration is referenced
1171 /// within an expression.
1172 ///
1173 /// There are several optional constructs attached to DeclRefExprs only when
1174 /// they apply in order to conserve memory. These are laid out past the end of
1175 /// the object, and flags in the DeclRefExprBitfield track whether they exist:
1176 ///
1177 /// DeclRefExprBits.HasQualifier:
1178 /// Specifies when this declaration reference expression has a C++
1179 /// nested-name-specifier.
1180 /// DeclRefExprBits.HasFoundDecl:
1181 /// Specifies when this declaration reference expression has a record of
1182 /// a NamedDecl (different from the referenced ValueDecl) which was found
1183 /// during name lookup and/or overload resolution.
1184 /// DeclRefExprBits.HasTemplateKWAndArgsInfo:
1185 /// Specifies when this declaration reference expression has an explicit
1186 /// C++ template keyword and/or template argument list.
1187 /// DeclRefExprBits.RefersToEnclosingVariableOrCapture
1188 /// Specifies when this declaration reference expression (validly)
1189 /// refers to an enclosed local or a captured variable.
1190 class DeclRefExpr final
1191 : public Expr,
1192 private llvm::TrailingObjects<DeclRefExpr, NestedNameSpecifierLoc,
1193 NamedDecl *, ASTTemplateKWAndArgsInfo,
1194 TemplateArgumentLoc> {
1195 friend class ASTStmtReader;
1196 friend class ASTStmtWriter;
1197 friend TrailingObjects;
1198
1199 /// The declaration that we are referencing.
1200 ValueDecl *D;
1201
1202 /// Provides source/type location info for the declaration name
1203 /// embedded in D.
1204 DeclarationNameLoc DNLoc;
1205
numTrailingObjects(OverloadToken<NestedNameSpecifierLoc>)1206 size_t numTrailingObjects(OverloadToken<NestedNameSpecifierLoc>) const {
1207 return hasQualifier();
1208 }
1209
numTrailingObjects(OverloadToken<NamedDecl * >)1210 size_t numTrailingObjects(OverloadToken<NamedDecl *>) const {
1211 return hasFoundDecl();
1212 }
1213
numTrailingObjects(OverloadToken<ASTTemplateKWAndArgsInfo>)1214 size_t numTrailingObjects(OverloadToken<ASTTemplateKWAndArgsInfo>) const {
1215 return hasTemplateKWAndArgsInfo();
1216 }
1217
1218 /// Test whether there is a distinct FoundDecl attached to the end of
1219 /// this DRE.
hasFoundDecl()1220 bool hasFoundDecl() const { return DeclRefExprBits.HasFoundDecl; }
1221
1222 DeclRefExpr(const ASTContext &Ctx, NestedNameSpecifierLoc QualifierLoc,
1223 SourceLocation TemplateKWLoc, ValueDecl *D,
1224 bool RefersToEnlosingVariableOrCapture,
1225 const DeclarationNameInfo &NameInfo, NamedDecl *FoundD,
1226 const TemplateArgumentListInfo *TemplateArgs, QualType T,
1227 ExprValueKind VK, NonOdrUseReason NOUR);
1228
1229 /// Construct an empty declaration reference expression.
DeclRefExpr(EmptyShell Empty)1230 explicit DeclRefExpr(EmptyShell Empty) : Expr(DeclRefExprClass, Empty) {}
1231
1232 public:
1233 DeclRefExpr(const ASTContext &Ctx, ValueDecl *D,
1234 bool RefersToEnclosingVariableOrCapture, QualType T,
1235 ExprValueKind VK, SourceLocation L,
1236 const DeclarationNameLoc &LocInfo = DeclarationNameLoc(),
1237 NonOdrUseReason NOUR = NOUR_None);
1238
1239 static DeclRefExpr *
1240 Create(const ASTContext &Context, NestedNameSpecifierLoc QualifierLoc,
1241 SourceLocation TemplateKWLoc, ValueDecl *D,
1242 bool RefersToEnclosingVariableOrCapture, SourceLocation NameLoc,
1243 QualType T, ExprValueKind VK, NamedDecl *FoundD = nullptr,
1244 const TemplateArgumentListInfo *TemplateArgs = nullptr,
1245 NonOdrUseReason NOUR = NOUR_None);
1246
1247 static DeclRefExpr *
1248 Create(const ASTContext &Context, NestedNameSpecifierLoc QualifierLoc,
1249 SourceLocation TemplateKWLoc, ValueDecl *D,
1250 bool RefersToEnclosingVariableOrCapture,
1251 const DeclarationNameInfo &NameInfo, QualType T, ExprValueKind VK,
1252 NamedDecl *FoundD = nullptr,
1253 const TemplateArgumentListInfo *TemplateArgs = nullptr,
1254 NonOdrUseReason NOUR = NOUR_None);
1255
1256 /// Construct an empty declaration reference expression.
1257 static DeclRefExpr *CreateEmpty(const ASTContext &Context, bool HasQualifier,
1258 bool HasFoundDecl,
1259 bool HasTemplateKWAndArgsInfo,
1260 unsigned NumTemplateArgs);
1261
getDecl()1262 ValueDecl *getDecl() { return D; }
getDecl()1263 const ValueDecl *getDecl() const { return D; }
setDecl(ValueDecl * NewD)1264 void setDecl(ValueDecl *NewD) { D = NewD; }
1265
getNameInfo()1266 DeclarationNameInfo getNameInfo() const {
1267 return DeclarationNameInfo(getDecl()->getDeclName(), getLocation(), DNLoc);
1268 }
1269
getLocation()1270 SourceLocation getLocation() const { return DeclRefExprBits.Loc; }
setLocation(SourceLocation L)1271 void setLocation(SourceLocation L) { DeclRefExprBits.Loc = L; }
1272 SourceLocation getBeginLoc() const LLVM_READONLY;
1273 SourceLocation getEndLoc() const LLVM_READONLY;
1274
1275 /// Determine whether this declaration reference was preceded by a
1276 /// C++ nested-name-specifier, e.g., \c N::foo.
hasQualifier()1277 bool hasQualifier() const { return DeclRefExprBits.HasQualifier; }
1278
1279 /// If the name was qualified, retrieves the nested-name-specifier
1280 /// that precedes the name, with source-location information.
getQualifierLoc()1281 NestedNameSpecifierLoc getQualifierLoc() const {
1282 if (!hasQualifier())
1283 return NestedNameSpecifierLoc();
1284 return *getTrailingObjects<NestedNameSpecifierLoc>();
1285 }
1286
1287 /// If the name was qualified, retrieves the nested-name-specifier
1288 /// that precedes the name. Otherwise, returns NULL.
getQualifier()1289 NestedNameSpecifier *getQualifier() const {
1290 return getQualifierLoc().getNestedNameSpecifier();
1291 }
1292
1293 /// Get the NamedDecl through which this reference occurred.
1294 ///
1295 /// This Decl may be different from the ValueDecl actually referred to in the
1296 /// presence of using declarations, etc. It always returns non-NULL, and may
1297 /// simple return the ValueDecl when appropriate.
1298
getFoundDecl()1299 NamedDecl *getFoundDecl() {
1300 return hasFoundDecl() ? *getTrailingObjects<NamedDecl *>() : D;
1301 }
1302
1303 /// Get the NamedDecl through which this reference occurred.
1304 /// See non-const variant.
getFoundDecl()1305 const NamedDecl *getFoundDecl() const {
1306 return hasFoundDecl() ? *getTrailingObjects<NamedDecl *>() : D;
1307 }
1308
hasTemplateKWAndArgsInfo()1309 bool hasTemplateKWAndArgsInfo() const {
1310 return DeclRefExprBits.HasTemplateKWAndArgsInfo;
1311 }
1312
1313 /// Retrieve the location of the template keyword preceding
1314 /// this name, if any.
getTemplateKeywordLoc()1315 SourceLocation getTemplateKeywordLoc() const {
1316 if (!hasTemplateKWAndArgsInfo())
1317 return SourceLocation();
1318 return getTrailingObjects<ASTTemplateKWAndArgsInfo>()->TemplateKWLoc;
1319 }
1320
1321 /// Retrieve the location of the left angle bracket starting the
1322 /// explicit template argument list following the name, if any.
getLAngleLoc()1323 SourceLocation getLAngleLoc() const {
1324 if (!hasTemplateKWAndArgsInfo())
1325 return SourceLocation();
1326 return getTrailingObjects<ASTTemplateKWAndArgsInfo>()->LAngleLoc;
1327 }
1328
1329 /// Retrieve the location of the right angle bracket ending the
1330 /// explicit template argument list following the name, if any.
getRAngleLoc()1331 SourceLocation getRAngleLoc() const {
1332 if (!hasTemplateKWAndArgsInfo())
1333 return SourceLocation();
1334 return getTrailingObjects<ASTTemplateKWAndArgsInfo>()->RAngleLoc;
1335 }
1336
1337 /// Determines whether the name in this declaration reference
1338 /// was preceded by the template keyword.
hasTemplateKeyword()1339 bool hasTemplateKeyword() const { return getTemplateKeywordLoc().isValid(); }
1340
1341 /// Determines whether this declaration reference was followed by an
1342 /// explicit template argument list.
hasExplicitTemplateArgs()1343 bool hasExplicitTemplateArgs() const { return getLAngleLoc().isValid(); }
1344
1345 /// Copies the template arguments (if present) into the given
1346 /// structure.
copyTemplateArgumentsInto(TemplateArgumentListInfo & List)1347 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const {
1348 if (hasExplicitTemplateArgs())
1349 getTrailingObjects<ASTTemplateKWAndArgsInfo>()->copyInto(
1350 getTrailingObjects<TemplateArgumentLoc>(), List);
1351 }
1352
1353 /// Retrieve the template arguments provided as part of this
1354 /// template-id.
getTemplateArgs()1355 const TemplateArgumentLoc *getTemplateArgs() const {
1356 if (!hasExplicitTemplateArgs())
1357 return nullptr;
1358 return getTrailingObjects<TemplateArgumentLoc>();
1359 }
1360
1361 /// Retrieve the number of template arguments provided as part of this
1362 /// template-id.
getNumTemplateArgs()1363 unsigned getNumTemplateArgs() const {
1364 if (!hasExplicitTemplateArgs())
1365 return 0;
1366 return getTrailingObjects<ASTTemplateKWAndArgsInfo>()->NumTemplateArgs;
1367 }
1368
template_arguments()1369 ArrayRef<TemplateArgumentLoc> template_arguments() const {
1370 return {getTemplateArgs(), getNumTemplateArgs()};
1371 }
1372
1373 /// Returns true if this expression refers to a function that
1374 /// was resolved from an overloaded set having size greater than 1.
hadMultipleCandidates()1375 bool hadMultipleCandidates() const {
1376 return DeclRefExprBits.HadMultipleCandidates;
1377 }
1378 /// Sets the flag telling whether this expression refers to
1379 /// a function that was resolved from an overloaded set having size
1380 /// greater than 1.
1381 void setHadMultipleCandidates(bool V = true) {
1382 DeclRefExprBits.HadMultipleCandidates = V;
1383 }
1384
1385 /// Is this expression a non-odr-use reference, and if so, why?
isNonOdrUse()1386 NonOdrUseReason isNonOdrUse() const {
1387 return static_cast<NonOdrUseReason>(DeclRefExprBits.NonOdrUseReason);
1388 }
1389
1390 /// Does this DeclRefExpr refer to an enclosing local or a captured
1391 /// variable?
refersToEnclosingVariableOrCapture()1392 bool refersToEnclosingVariableOrCapture() const {
1393 return DeclRefExprBits.RefersToEnclosingVariableOrCapture;
1394 }
1395
classof(const Stmt * T)1396 static bool classof(const Stmt *T) {
1397 return T->getStmtClass() == DeclRefExprClass;
1398 }
1399
1400 // Iterators
children()1401 child_range children() {
1402 return child_range(child_iterator(), child_iterator());
1403 }
1404
children()1405 const_child_range children() const {
1406 return const_child_range(const_child_iterator(), const_child_iterator());
1407 }
1408 };
1409
1410 /// Used by IntegerLiteral/FloatingLiteral to store the numeric without
1411 /// leaking memory.
1412 ///
1413 /// For large floats/integers, APFloat/APInt will allocate memory from the heap
1414 /// to represent these numbers. Unfortunately, when we use a BumpPtrAllocator
1415 /// to allocate IntegerLiteral/FloatingLiteral nodes the memory associated with
1416 /// the APFloat/APInt values will never get freed. APNumericStorage uses
1417 /// ASTContext's allocator for memory allocation.
1418 class APNumericStorage {
1419 union {
1420 uint64_t VAL; ///< Used to store the <= 64 bits integer value.
1421 uint64_t *pVal; ///< Used to store the >64 bits integer value.
1422 };
1423 unsigned BitWidth;
1424
hasAllocation()1425 bool hasAllocation() const { return llvm::APInt::getNumWords(BitWidth) > 1; }
1426
1427 APNumericStorage(const APNumericStorage &) = delete;
1428 void operator=(const APNumericStorage &) = delete;
1429
1430 protected:
APNumericStorage()1431 APNumericStorage() : VAL(0), BitWidth(0) { }
1432
getIntValue()1433 llvm::APInt getIntValue() const {
1434 unsigned NumWords = llvm::APInt::getNumWords(BitWidth);
1435 if (NumWords > 1)
1436 return llvm::APInt(BitWidth, NumWords, pVal);
1437 else
1438 return llvm::APInt(BitWidth, VAL);
1439 }
1440 void setIntValue(const ASTContext &C, const llvm::APInt &Val);
1441 };
1442
1443 class APIntStorage : private APNumericStorage {
1444 public:
getValue()1445 llvm::APInt getValue() const { return getIntValue(); }
setValue(const ASTContext & C,const llvm::APInt & Val)1446 void setValue(const ASTContext &C, const llvm::APInt &Val) {
1447 setIntValue(C, Val);
1448 }
1449 };
1450
1451 class APFloatStorage : private APNumericStorage {
1452 public:
getValue(const llvm::fltSemantics & Semantics)1453 llvm::APFloat getValue(const llvm::fltSemantics &Semantics) const {
1454 return llvm::APFloat(Semantics, getIntValue());
1455 }
setValue(const ASTContext & C,const llvm::APFloat & Val)1456 void setValue(const ASTContext &C, const llvm::APFloat &Val) {
1457 setIntValue(C, Val.bitcastToAPInt());
1458 }
1459 };
1460
1461 class IntegerLiteral : public Expr, public APIntStorage {
1462 SourceLocation Loc;
1463
1464 /// Construct an empty integer literal.
IntegerLiteral(EmptyShell Empty)1465 explicit IntegerLiteral(EmptyShell Empty)
1466 : Expr(IntegerLiteralClass, Empty) { }
1467
1468 public:
1469 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy,
1470 // or UnsignedLongLongTy
1471 IntegerLiteral(const ASTContext &C, const llvm::APInt &V, QualType type,
1472 SourceLocation l);
1473
1474 /// Returns a new integer literal with value 'V' and type 'type'.
1475 /// \param type - either IntTy, LongTy, LongLongTy, UnsignedIntTy,
1476 /// UnsignedLongTy, or UnsignedLongLongTy which should match the size of V
1477 /// \param V - the value that the returned integer literal contains.
1478 static IntegerLiteral *Create(const ASTContext &C, const llvm::APInt &V,
1479 QualType type, SourceLocation l);
1480 /// Returns a new empty integer literal.
1481 static IntegerLiteral *Create(const ASTContext &C, EmptyShell Empty);
1482
getBeginLoc()1483 SourceLocation getBeginLoc() const LLVM_READONLY { return Loc; }
getEndLoc()1484 SourceLocation getEndLoc() const LLVM_READONLY { return Loc; }
1485
1486 /// Retrieve the location of the literal.
getLocation()1487 SourceLocation getLocation() const { return Loc; }
1488
setLocation(SourceLocation Location)1489 void setLocation(SourceLocation Location) { Loc = Location; }
1490
classof(const Stmt * T)1491 static bool classof(const Stmt *T) {
1492 return T->getStmtClass() == IntegerLiteralClass;
1493 }
1494
1495 // Iterators
children()1496 child_range children() {
1497 return child_range(child_iterator(), child_iterator());
1498 }
children()1499 const_child_range children() const {
1500 return const_child_range(const_child_iterator(), const_child_iterator());
1501 }
1502 };
1503
1504 class FixedPointLiteral : public Expr, public APIntStorage {
1505 SourceLocation Loc;
1506 unsigned Scale;
1507
1508 /// \brief Construct an empty fixed-point literal.
FixedPointLiteral(EmptyShell Empty)1509 explicit FixedPointLiteral(EmptyShell Empty)
1510 : Expr(FixedPointLiteralClass, Empty) {}
1511
1512 public:
1513 FixedPointLiteral(const ASTContext &C, const llvm::APInt &V, QualType type,
1514 SourceLocation l, unsigned Scale);
1515
1516 // Store the int as is without any bit shifting.
1517 static FixedPointLiteral *CreateFromRawInt(const ASTContext &C,
1518 const llvm::APInt &V,
1519 QualType type, SourceLocation l,
1520 unsigned Scale);
1521
1522 /// Returns an empty fixed-point literal.
1523 static FixedPointLiteral *Create(const ASTContext &C, EmptyShell Empty);
1524
getBeginLoc()1525 SourceLocation getBeginLoc() const LLVM_READONLY { return Loc; }
getEndLoc()1526 SourceLocation getEndLoc() const LLVM_READONLY { return Loc; }
1527
1528 /// \brief Retrieve the location of the literal.
getLocation()1529 SourceLocation getLocation() const { return Loc; }
1530
setLocation(SourceLocation Location)1531 void setLocation(SourceLocation Location) { Loc = Location; }
1532
getScale()1533 unsigned getScale() const { return Scale; }
setScale(unsigned S)1534 void setScale(unsigned S) { Scale = S; }
1535
classof(const Stmt * T)1536 static bool classof(const Stmt *T) {
1537 return T->getStmtClass() == FixedPointLiteralClass;
1538 }
1539
1540 std::string getValueAsString(unsigned Radix) const;
1541
1542 // Iterators
children()1543 child_range children() {
1544 return child_range(child_iterator(), child_iterator());
1545 }
children()1546 const_child_range children() const {
1547 return const_child_range(const_child_iterator(), const_child_iterator());
1548 }
1549 };
1550
1551 class CharacterLiteral : public Expr {
1552 public:
1553 enum CharacterKind {
1554 Ascii,
1555 Wide,
1556 UTF8,
1557 UTF16,
1558 UTF32
1559 };
1560
1561 private:
1562 unsigned Value;
1563 SourceLocation Loc;
1564 public:
1565 // type should be IntTy
CharacterLiteral(unsigned value,CharacterKind kind,QualType type,SourceLocation l)1566 CharacterLiteral(unsigned value, CharacterKind kind, QualType type,
1567 SourceLocation l)
1568 : Expr(CharacterLiteralClass, type, VK_RValue, OK_Ordinary), Value(value),
1569 Loc(l) {
1570 CharacterLiteralBits.Kind = kind;
1571 setDependence(ExprDependence::None);
1572 }
1573
1574 /// Construct an empty character literal.
CharacterLiteral(EmptyShell Empty)1575 CharacterLiteral(EmptyShell Empty) : Expr(CharacterLiteralClass, Empty) { }
1576
getLocation()1577 SourceLocation getLocation() const { return Loc; }
getKind()1578 CharacterKind getKind() const {
1579 return static_cast<CharacterKind>(CharacterLiteralBits.Kind);
1580 }
1581
getBeginLoc()1582 SourceLocation getBeginLoc() const LLVM_READONLY { return Loc; }
getEndLoc()1583 SourceLocation getEndLoc() const LLVM_READONLY { return Loc; }
1584
getValue()1585 unsigned getValue() const { return Value; }
1586
setLocation(SourceLocation Location)1587 void setLocation(SourceLocation Location) { Loc = Location; }
setKind(CharacterKind kind)1588 void setKind(CharacterKind kind) { CharacterLiteralBits.Kind = kind; }
setValue(unsigned Val)1589 void setValue(unsigned Val) { Value = Val; }
1590
classof(const Stmt * T)1591 static bool classof(const Stmt *T) {
1592 return T->getStmtClass() == CharacterLiteralClass;
1593 }
1594
1595 // Iterators
children()1596 child_range children() {
1597 return child_range(child_iterator(), child_iterator());
1598 }
children()1599 const_child_range children() const {
1600 return const_child_range(const_child_iterator(), const_child_iterator());
1601 }
1602 };
1603
1604 class FloatingLiteral : public Expr, private APFloatStorage {
1605 SourceLocation Loc;
1606
1607 FloatingLiteral(const ASTContext &C, const llvm::APFloat &V, bool isexact,
1608 QualType Type, SourceLocation L);
1609
1610 /// Construct an empty floating-point literal.
1611 explicit FloatingLiteral(const ASTContext &C, EmptyShell Empty);
1612
1613 public:
1614 static FloatingLiteral *Create(const ASTContext &C, const llvm::APFloat &V,
1615 bool isexact, QualType Type, SourceLocation L);
1616 static FloatingLiteral *Create(const ASTContext &C, EmptyShell Empty);
1617
getValue()1618 llvm::APFloat getValue() const {
1619 return APFloatStorage::getValue(getSemantics());
1620 }
setValue(const ASTContext & C,const llvm::APFloat & Val)1621 void setValue(const ASTContext &C, const llvm::APFloat &Val) {
1622 assert(&getSemantics() == &Val.getSemantics() && "Inconsistent semantics");
1623 APFloatStorage::setValue(C, Val);
1624 }
1625
1626 /// Get a raw enumeration value representing the floating-point semantics of
1627 /// this literal (32-bit IEEE, x87, ...), suitable for serialisation.
getRawSemantics()1628 llvm::APFloatBase::Semantics getRawSemantics() const {
1629 return static_cast<llvm::APFloatBase::Semantics>(
1630 FloatingLiteralBits.Semantics);
1631 }
1632
1633 /// Set the raw enumeration value representing the floating-point semantics of
1634 /// this literal (32-bit IEEE, x87, ...), suitable for serialisation.
setRawSemantics(llvm::APFloatBase::Semantics Sem)1635 void setRawSemantics(llvm::APFloatBase::Semantics Sem) {
1636 FloatingLiteralBits.Semantics = Sem;
1637 }
1638
1639 /// Return the APFloat semantics this literal uses.
getSemantics()1640 const llvm::fltSemantics &getSemantics() const {
1641 return llvm::APFloatBase::EnumToSemantics(
1642 static_cast<llvm::APFloatBase::Semantics>(
1643 FloatingLiteralBits.Semantics));
1644 }
1645
1646 /// Set the APFloat semantics this literal uses.
setSemantics(const llvm::fltSemantics & Sem)1647 void setSemantics(const llvm::fltSemantics &Sem) {
1648 FloatingLiteralBits.Semantics = llvm::APFloatBase::SemanticsToEnum(Sem);
1649 }
1650
isExact()1651 bool isExact() const { return FloatingLiteralBits.IsExact; }
setExact(bool E)1652 void setExact(bool E) { FloatingLiteralBits.IsExact = E; }
1653
1654 /// getValueAsApproximateDouble - This returns the value as an inaccurate
1655 /// double. Note that this may cause loss of precision, but is useful for
1656 /// debugging dumps, etc.
1657 double getValueAsApproximateDouble() const;
1658
getLocation()1659 SourceLocation getLocation() const { return Loc; }
setLocation(SourceLocation L)1660 void setLocation(SourceLocation L) { Loc = L; }
1661
getBeginLoc()1662 SourceLocation getBeginLoc() const LLVM_READONLY { return Loc; }
getEndLoc()1663 SourceLocation getEndLoc() const LLVM_READONLY { return Loc; }
1664
classof(const Stmt * T)1665 static bool classof(const Stmt *T) {
1666 return T->getStmtClass() == FloatingLiteralClass;
1667 }
1668
1669 // Iterators
children()1670 child_range children() {
1671 return child_range(child_iterator(), child_iterator());
1672 }
children()1673 const_child_range children() const {
1674 return const_child_range(const_child_iterator(), const_child_iterator());
1675 }
1676 };
1677
1678 /// ImaginaryLiteral - We support imaginary integer and floating point literals,
1679 /// like "1.0i". We represent these as a wrapper around FloatingLiteral and
1680 /// IntegerLiteral classes. Instances of this class always have a Complex type
1681 /// whose element type matches the subexpression.
1682 ///
1683 class ImaginaryLiteral : public Expr {
1684 Stmt *Val;
1685 public:
ImaginaryLiteral(Expr * val,QualType Ty)1686 ImaginaryLiteral(Expr *val, QualType Ty)
1687 : Expr(ImaginaryLiteralClass, Ty, VK_RValue, OK_Ordinary), Val(val) {
1688 setDependence(ExprDependence::None);
1689 }
1690
1691 /// Build an empty imaginary literal.
ImaginaryLiteral(EmptyShell Empty)1692 explicit ImaginaryLiteral(EmptyShell Empty)
1693 : Expr(ImaginaryLiteralClass, Empty) { }
1694
getSubExpr()1695 const Expr *getSubExpr() const { return cast<Expr>(Val); }
getSubExpr()1696 Expr *getSubExpr() { return cast<Expr>(Val); }
setSubExpr(Expr * E)1697 void setSubExpr(Expr *E) { Val = E; }
1698
getBeginLoc()1699 SourceLocation getBeginLoc() const LLVM_READONLY {
1700 return Val->getBeginLoc();
1701 }
getEndLoc()1702 SourceLocation getEndLoc() const LLVM_READONLY { return Val->getEndLoc(); }
1703
classof(const Stmt * T)1704 static bool classof(const Stmt *T) {
1705 return T->getStmtClass() == ImaginaryLiteralClass;
1706 }
1707
1708 // Iterators
children()1709 child_range children() { return child_range(&Val, &Val+1); }
children()1710 const_child_range children() const {
1711 return const_child_range(&Val, &Val + 1);
1712 }
1713 };
1714
1715 /// StringLiteral - This represents a string literal expression, e.g. "foo"
1716 /// or L"bar" (wide strings). The actual string data can be obtained with
1717 /// getBytes() and is NOT null-terminated. The length of the string data is
1718 /// determined by calling getByteLength().
1719 ///
1720 /// The C type for a string is always a ConstantArrayType. In C++, the char
1721 /// type is const qualified, in C it is not.
1722 ///
1723 /// Note that strings in C can be formed by concatenation of multiple string
1724 /// literal pptokens in translation phase #6. This keeps track of the locations
1725 /// of each of these pieces.
1726 ///
1727 /// Strings in C can also be truncated and extended by assigning into arrays,
1728 /// e.g. with constructs like:
1729 /// char X[2] = "foobar";
1730 /// In this case, getByteLength() will return 6, but the string literal will
1731 /// have type "char[2]".
1732 class StringLiteral final
1733 : public Expr,
1734 private llvm::TrailingObjects<StringLiteral, unsigned, SourceLocation,
1735 char> {
1736 friend class ASTStmtReader;
1737 friend TrailingObjects;
1738
1739 /// StringLiteral is followed by several trailing objects. They are in order:
1740 ///
1741 /// * A single unsigned storing the length in characters of this string. The
1742 /// length in bytes is this length times the width of a single character.
1743 /// Always present and stored as a trailing objects because storing it in
1744 /// StringLiteral would increase the size of StringLiteral by sizeof(void *)
1745 /// due to alignment requirements. If you add some data to StringLiteral,
1746 /// consider moving it inside StringLiteral.
1747 ///
1748 /// * An array of getNumConcatenated() SourceLocation, one for each of the
1749 /// token this string is made of.
1750 ///
1751 /// * An array of getByteLength() char used to store the string data.
1752
1753 public:
1754 enum StringKind { Ascii, Wide, UTF8, UTF16, UTF32 };
1755
1756 private:
numTrailingObjects(OverloadToken<unsigned>)1757 unsigned numTrailingObjects(OverloadToken<unsigned>) const { return 1; }
numTrailingObjects(OverloadToken<SourceLocation>)1758 unsigned numTrailingObjects(OverloadToken<SourceLocation>) const {
1759 return getNumConcatenated();
1760 }
1761
numTrailingObjects(OverloadToken<char>)1762 unsigned numTrailingObjects(OverloadToken<char>) const {
1763 return getByteLength();
1764 }
1765
getStrDataAsChar()1766 char *getStrDataAsChar() { return getTrailingObjects<char>(); }
getStrDataAsChar()1767 const char *getStrDataAsChar() const { return getTrailingObjects<char>(); }
1768
getStrDataAsUInt16()1769 const uint16_t *getStrDataAsUInt16() const {
1770 return reinterpret_cast<const uint16_t *>(getTrailingObjects<char>());
1771 }
1772
getStrDataAsUInt32()1773 const uint32_t *getStrDataAsUInt32() const {
1774 return reinterpret_cast<const uint32_t *>(getTrailingObjects<char>());
1775 }
1776
1777 /// Build a string literal.
1778 StringLiteral(const ASTContext &Ctx, StringRef Str, StringKind Kind,
1779 bool Pascal, QualType Ty, const SourceLocation *Loc,
1780 unsigned NumConcatenated);
1781
1782 /// Build an empty string literal.
1783 StringLiteral(EmptyShell Empty, unsigned NumConcatenated, unsigned Length,
1784 unsigned CharByteWidth);
1785
1786 /// Map a target and string kind to the appropriate character width.
1787 static unsigned mapCharByteWidth(TargetInfo const &Target, StringKind SK);
1788
1789 /// Set one of the string literal token.
setStrTokenLoc(unsigned TokNum,SourceLocation L)1790 void setStrTokenLoc(unsigned TokNum, SourceLocation L) {
1791 assert(TokNum < getNumConcatenated() && "Invalid tok number");
1792 getTrailingObjects<SourceLocation>()[TokNum] = L;
1793 }
1794
1795 public:
1796 /// This is the "fully general" constructor that allows representation of
1797 /// strings formed from multiple concatenated tokens.
1798 static StringLiteral *Create(const ASTContext &Ctx, StringRef Str,
1799 StringKind Kind, bool Pascal, QualType Ty,
1800 const SourceLocation *Loc,
1801 unsigned NumConcatenated);
1802
1803 /// Simple constructor for string literals made from one token.
Create(const ASTContext & Ctx,StringRef Str,StringKind Kind,bool Pascal,QualType Ty,SourceLocation Loc)1804 static StringLiteral *Create(const ASTContext &Ctx, StringRef Str,
1805 StringKind Kind, bool Pascal, QualType Ty,
1806 SourceLocation Loc) {
1807 return Create(Ctx, Str, Kind, Pascal, Ty, &Loc, 1);
1808 }
1809
1810 /// Construct an empty string literal.
1811 static StringLiteral *CreateEmpty(const ASTContext &Ctx,
1812 unsigned NumConcatenated, unsigned Length,
1813 unsigned CharByteWidth);
1814
getString()1815 StringRef getString() const {
1816 assert(getCharByteWidth() == 1 &&
1817 "This function is used in places that assume strings use char");
1818 return StringRef(getStrDataAsChar(), getByteLength());
1819 }
1820
1821 /// Allow access to clients that need the byte representation, such as
1822 /// ASTWriterStmt::VisitStringLiteral().
getBytes()1823 StringRef getBytes() const {
1824 // FIXME: StringRef may not be the right type to use as a result for this.
1825 return StringRef(getStrDataAsChar(), getByteLength());
1826 }
1827
1828 void outputString(raw_ostream &OS) const;
1829
getCodeUnit(size_t i)1830 uint32_t getCodeUnit(size_t i) const {
1831 assert(i < getLength() && "out of bounds access");
1832 switch (getCharByteWidth()) {
1833 case 1:
1834 return static_cast<unsigned char>(getStrDataAsChar()[i]);
1835 case 2:
1836 return getStrDataAsUInt16()[i];
1837 case 4:
1838 return getStrDataAsUInt32()[i];
1839 }
1840 llvm_unreachable("Unsupported character width!");
1841 }
1842
getByteLength()1843 unsigned getByteLength() const { return getCharByteWidth() * getLength(); }
getLength()1844 unsigned getLength() const { return *getTrailingObjects<unsigned>(); }
getCharByteWidth()1845 unsigned getCharByteWidth() const { return StringLiteralBits.CharByteWidth; }
1846
getKind()1847 StringKind getKind() const {
1848 return static_cast<StringKind>(StringLiteralBits.Kind);
1849 }
1850
isAscii()1851 bool isAscii() const { return getKind() == Ascii; }
isWide()1852 bool isWide() const { return getKind() == Wide; }
isUTF8()1853 bool isUTF8() const { return getKind() == UTF8; }
isUTF16()1854 bool isUTF16() const { return getKind() == UTF16; }
isUTF32()1855 bool isUTF32() const { return getKind() == UTF32; }
isPascal()1856 bool isPascal() const { return StringLiteralBits.IsPascal; }
1857
containsNonAscii()1858 bool containsNonAscii() const {
1859 for (auto c : getString())
1860 if (!isASCII(c))
1861 return true;
1862 return false;
1863 }
1864
containsNonAsciiOrNull()1865 bool containsNonAsciiOrNull() const {
1866 for (auto c : getString())
1867 if (!isASCII(c) || !c)
1868 return true;
1869 return false;
1870 }
1871
1872 /// getNumConcatenated - Get the number of string literal tokens that were
1873 /// concatenated in translation phase #6 to form this string literal.
getNumConcatenated()1874 unsigned getNumConcatenated() const {
1875 return StringLiteralBits.NumConcatenated;
1876 }
1877
1878 /// Get one of the string literal token.
getStrTokenLoc(unsigned TokNum)1879 SourceLocation getStrTokenLoc(unsigned TokNum) const {
1880 assert(TokNum < getNumConcatenated() && "Invalid tok number");
1881 return getTrailingObjects<SourceLocation>()[TokNum];
1882 }
1883
1884 /// getLocationOfByte - Return a source location that points to the specified
1885 /// byte of this string literal.
1886 ///
1887 /// Strings are amazingly complex. They can be formed from multiple tokens
1888 /// and can have escape sequences in them in addition to the usual trigraph
1889 /// and escaped newline business. This routine handles this complexity.
1890 ///
1891 SourceLocation
1892 getLocationOfByte(unsigned ByteNo, const SourceManager &SM,
1893 const LangOptions &Features, const TargetInfo &Target,
1894 unsigned *StartToken = nullptr,
1895 unsigned *StartTokenByteOffset = nullptr) const;
1896
1897 typedef const SourceLocation *tokloc_iterator;
1898
tokloc_begin()1899 tokloc_iterator tokloc_begin() const {
1900 return getTrailingObjects<SourceLocation>();
1901 }
1902
tokloc_end()1903 tokloc_iterator tokloc_end() const {
1904 return getTrailingObjects<SourceLocation>() + getNumConcatenated();
1905 }
1906
getBeginLoc()1907 SourceLocation getBeginLoc() const LLVM_READONLY { return *tokloc_begin(); }
getEndLoc()1908 SourceLocation getEndLoc() const LLVM_READONLY { return *(tokloc_end() - 1); }
1909
classof(const Stmt * T)1910 static bool classof(const Stmt *T) {
1911 return T->getStmtClass() == StringLiteralClass;
1912 }
1913
1914 // Iterators
children()1915 child_range children() {
1916 return child_range(child_iterator(), child_iterator());
1917 }
children()1918 const_child_range children() const {
1919 return const_child_range(const_child_iterator(), const_child_iterator());
1920 }
1921 };
1922
1923 /// [C99 6.4.2.2] - A predefined identifier such as __func__.
1924 class PredefinedExpr final
1925 : public Expr,
1926 private llvm::TrailingObjects<PredefinedExpr, Stmt *, Expr *,
1927 TypeSourceInfo *> {
1928 friend class ASTStmtReader;
1929 friend TrailingObjects;
1930
1931 // PredefinedExpr is optionally followed by a single trailing
1932 // "Stmt *" for the predefined identifier. It is present if and only if
1933 // hasFunctionName() is true and is always a "StringLiteral *".
1934 // It can also be followed by a Expr* in the case of a
1935 // __builtin_unique_stable_name with an expression, or TypeSourceInfo * if
1936 // __builtin_unique_stable_name with a type.
1937
1938 public:
1939 enum IdentKind {
1940 Func,
1941 Function,
1942 LFunction, // Same as Function, but as wide string.
1943 FuncDName,
1944 FuncSig,
1945 LFuncSig, // Same as FuncSig, but as as wide string
1946 PrettyFunction,
1947 /// The same as PrettyFunction, except that the
1948 /// 'virtual' keyword is omitted for virtual member functions.
1949 PrettyFunctionNoVirtual,
1950 UniqueStableNameType,
1951 UniqueStableNameExpr,
1952 };
1953
1954 private:
1955 PredefinedExpr(SourceLocation L, QualType FNTy, IdentKind IK,
1956 StringLiteral *SL);
1957 PredefinedExpr(SourceLocation L, QualType FNTy, IdentKind IK,
1958 TypeSourceInfo *Info);
1959 PredefinedExpr(SourceLocation L, QualType FNTy, IdentKind IK,
1960 Expr *E);
1961
1962 explicit PredefinedExpr(EmptyShell Empty, bool HasFunctionName);
1963
1964 /// True if this PredefinedExpr has storage for a function name.
hasFunctionName()1965 bool hasFunctionName() const { return PredefinedExprBits.HasFunctionName; }
1966
setFunctionName(StringLiteral * SL)1967 void setFunctionName(StringLiteral *SL) {
1968 assert(hasFunctionName() &&
1969 "This PredefinedExpr has no storage for a function name!");
1970 *getTrailingObjects<Stmt *>() = SL;
1971 }
1972
setTypeSourceInfo(TypeSourceInfo * Info)1973 void setTypeSourceInfo(TypeSourceInfo *Info) {
1974 assert(!hasFunctionName() && getIdentKind() == UniqueStableNameType &&
1975 "TypeSourceInfo only valid for UniqueStableName of a Type");
1976 *getTrailingObjects<TypeSourceInfo *>() = Info;
1977 }
1978
setExpr(Expr * E)1979 void setExpr(Expr *E) {
1980 assert(!hasFunctionName() && getIdentKind() == UniqueStableNameExpr &&
1981 "TypeSourceInfo only valid for UniqueStableName of n Expression.");
1982 *getTrailingObjects<Expr *>() = E;
1983 }
1984
numTrailingObjects(OverloadToken<Stmt * >)1985 size_t numTrailingObjects(OverloadToken<Stmt *>) const {
1986 return hasFunctionName();
1987 }
1988
numTrailingObjects(OverloadToken<TypeSourceInfo * >)1989 size_t numTrailingObjects(OverloadToken<TypeSourceInfo *>) const {
1990 return getIdentKind() == UniqueStableNameType && !hasFunctionName();
1991 }
numTrailingObjects(OverloadToken<Expr * >)1992 size_t numTrailingObjects(OverloadToken<Expr *>) const {
1993 return getIdentKind() == UniqueStableNameExpr && !hasFunctionName();
1994 }
1995
1996 public:
1997 /// Create a PredefinedExpr.
1998 static PredefinedExpr *Create(const ASTContext &Ctx, SourceLocation L,
1999 QualType FNTy, IdentKind IK, StringLiteral *SL);
2000 static PredefinedExpr *Create(const ASTContext &Ctx, SourceLocation L,
2001 QualType FNTy, IdentKind IK, StringLiteral *SL,
2002 TypeSourceInfo *Info);
2003 static PredefinedExpr *Create(const ASTContext &Ctx, SourceLocation L,
2004 QualType FNTy, IdentKind IK, StringLiteral *SL,
2005 Expr *E);
2006
2007 /// Create an empty PredefinedExpr.
2008 static PredefinedExpr *CreateEmpty(const ASTContext &Ctx,
2009 bool HasFunctionName);
2010
getIdentKind()2011 IdentKind getIdentKind() const {
2012 return static_cast<IdentKind>(PredefinedExprBits.Kind);
2013 }
2014
getLocation()2015 SourceLocation getLocation() const { return PredefinedExprBits.Loc; }
setLocation(SourceLocation L)2016 void setLocation(SourceLocation L) { PredefinedExprBits.Loc = L; }
2017
getFunctionName()2018 StringLiteral *getFunctionName() {
2019 return hasFunctionName()
2020 ? static_cast<StringLiteral *>(*getTrailingObjects<Stmt *>())
2021 : nullptr;
2022 }
2023
getFunctionName()2024 const StringLiteral *getFunctionName() const {
2025 return hasFunctionName()
2026 ? static_cast<StringLiteral *>(*getTrailingObjects<Stmt *>())
2027 : nullptr;
2028 }
2029
getTypeSourceInfo()2030 TypeSourceInfo *getTypeSourceInfo() {
2031 assert(!hasFunctionName() && getIdentKind() == UniqueStableNameType &&
2032 "TypeSourceInfo only valid for UniqueStableName of a Type");
2033 return *getTrailingObjects<TypeSourceInfo *>();
2034 }
2035
getTypeSourceInfo()2036 const TypeSourceInfo *getTypeSourceInfo() const {
2037 assert(!hasFunctionName() && getIdentKind() == UniqueStableNameType &&
2038 "TypeSourceInfo only valid for UniqueStableName of a Type");
2039 return *getTrailingObjects<TypeSourceInfo *>();
2040 }
2041
getExpr()2042 Expr *getExpr() {
2043 assert(!hasFunctionName() && getIdentKind() == UniqueStableNameExpr &&
2044 "TypeSourceInfo only valid for UniqueStableName of n Expression.");
2045 return *getTrailingObjects<Expr *>();
2046 }
2047
getExpr()2048 const Expr *getExpr() const {
2049 assert(!hasFunctionName() && getIdentKind() == UniqueStableNameExpr &&
2050 "TypeSourceInfo only valid for UniqueStableName of n Expression.");
2051 return *getTrailingObjects<Expr *>();
2052 }
2053
2054 static StringRef getIdentKindName(IdentKind IK);
2055 static std::string ComputeName(IdentKind IK, const Decl *CurrentDecl);
2056 static std::string ComputeName(ASTContext &Context, IdentKind IK,
2057 const QualType Ty);
2058
getBeginLoc()2059 SourceLocation getBeginLoc() const { return getLocation(); }
getEndLoc()2060 SourceLocation getEndLoc() const { return getLocation(); }
2061
classof(const Stmt * T)2062 static bool classof(const Stmt *T) {
2063 return T->getStmtClass() == PredefinedExprClass;
2064 }
2065
2066 // Iterators
children()2067 child_range children() {
2068 return child_range(getTrailingObjects<Stmt *>(),
2069 getTrailingObjects<Stmt *>() + hasFunctionName());
2070 }
2071
children()2072 const_child_range children() const {
2073 return const_child_range(getTrailingObjects<Stmt *>(),
2074 getTrailingObjects<Stmt *>() + hasFunctionName());
2075 }
2076 };
2077
2078 /// ParenExpr - This represents a parethesized expression, e.g. "(1)". This
2079 /// AST node is only formed if full location information is requested.
2080 class ParenExpr : public Expr {
2081 SourceLocation L, R;
2082 Stmt *Val;
2083 public:
ParenExpr(SourceLocation l,SourceLocation r,Expr * val)2084 ParenExpr(SourceLocation l, SourceLocation r, Expr *val)
2085 : Expr(ParenExprClass, val->getType(), val->getValueKind(),
2086 val->getObjectKind()),
2087 L(l), R(r), Val(val) {
2088 setDependence(computeDependence(this));
2089 }
2090
2091 /// Construct an empty parenthesized expression.
ParenExpr(EmptyShell Empty)2092 explicit ParenExpr(EmptyShell Empty)
2093 : Expr(ParenExprClass, Empty) { }
2094
getSubExpr()2095 const Expr *getSubExpr() const { return cast<Expr>(Val); }
getSubExpr()2096 Expr *getSubExpr() { return cast<Expr>(Val); }
setSubExpr(Expr * E)2097 void setSubExpr(Expr *E) { Val = E; }
2098
getBeginLoc()2099 SourceLocation getBeginLoc() const LLVM_READONLY { return L; }
getEndLoc()2100 SourceLocation getEndLoc() const LLVM_READONLY { return R; }
2101
2102 /// Get the location of the left parentheses '('.
getLParen()2103 SourceLocation getLParen() const { return L; }
setLParen(SourceLocation Loc)2104 void setLParen(SourceLocation Loc) { L = Loc; }
2105
2106 /// Get the location of the right parentheses ')'.
getRParen()2107 SourceLocation getRParen() const { return R; }
setRParen(SourceLocation Loc)2108 void setRParen(SourceLocation Loc) { R = Loc; }
2109
classof(const Stmt * T)2110 static bool classof(const Stmt *T) {
2111 return T->getStmtClass() == ParenExprClass;
2112 }
2113
2114 // Iterators
children()2115 child_range children() { return child_range(&Val, &Val+1); }
children()2116 const_child_range children() const {
2117 return const_child_range(&Val, &Val + 1);
2118 }
2119 };
2120
2121 /// UnaryOperator - This represents the unary-expression's (except sizeof and
2122 /// alignof), the postinc/postdec operators from postfix-expression, and various
2123 /// extensions.
2124 ///
2125 /// Notes on various nodes:
2126 ///
2127 /// Real/Imag - These return the real/imag part of a complex operand. If
2128 /// applied to a non-complex value, the former returns its operand and the
2129 /// later returns zero in the type of the operand.
2130 ///
2131 class UnaryOperator final
2132 : public Expr,
2133 private llvm::TrailingObjects<UnaryOperator, FPOptionsOverride> {
2134 Stmt *Val;
2135
numTrailingObjects(OverloadToken<FPOptionsOverride>)2136 size_t numTrailingObjects(OverloadToken<FPOptionsOverride>) const {
2137 return UnaryOperatorBits.HasFPFeatures ? 1 : 0;
2138 }
2139
getTrailingFPFeatures()2140 FPOptionsOverride &getTrailingFPFeatures() {
2141 assert(UnaryOperatorBits.HasFPFeatures);
2142 return *getTrailingObjects<FPOptionsOverride>();
2143 }
2144
getTrailingFPFeatures()2145 const FPOptionsOverride &getTrailingFPFeatures() const {
2146 assert(UnaryOperatorBits.HasFPFeatures);
2147 return *getTrailingObjects<FPOptionsOverride>();
2148 }
2149
2150 public:
2151 typedef UnaryOperatorKind Opcode;
2152
2153 protected:
2154 UnaryOperator(const ASTContext &Ctx, Expr *input, Opcode opc, QualType type,
2155 ExprValueKind VK, ExprObjectKind OK, SourceLocation l,
2156 bool CanOverflow, FPOptionsOverride FPFeatures);
2157
2158 /// Build an empty unary operator.
UnaryOperator(bool HasFPFeatures,EmptyShell Empty)2159 explicit UnaryOperator(bool HasFPFeatures, EmptyShell Empty)
2160 : Expr(UnaryOperatorClass, Empty) {
2161 UnaryOperatorBits.Opc = UO_AddrOf;
2162 UnaryOperatorBits.HasFPFeatures = HasFPFeatures;
2163 }
2164
2165 public:
2166 static UnaryOperator *CreateEmpty(const ASTContext &C, bool hasFPFeatures);
2167
2168 static UnaryOperator *Create(const ASTContext &C, Expr *input, Opcode opc,
2169 QualType type, ExprValueKind VK,
2170 ExprObjectKind OK, SourceLocation l,
2171 bool CanOverflow, FPOptionsOverride FPFeatures);
2172
getOpcode()2173 Opcode getOpcode() const {
2174 return static_cast<Opcode>(UnaryOperatorBits.Opc);
2175 }
setOpcode(Opcode Opc)2176 void setOpcode(Opcode Opc) { UnaryOperatorBits.Opc = Opc; }
2177
getSubExpr()2178 Expr *getSubExpr() const { return cast<Expr>(Val); }
setSubExpr(Expr * E)2179 void setSubExpr(Expr *E) { Val = E; }
2180
2181 /// getOperatorLoc - Return the location of the operator.
getOperatorLoc()2182 SourceLocation getOperatorLoc() const { return UnaryOperatorBits.Loc; }
setOperatorLoc(SourceLocation L)2183 void setOperatorLoc(SourceLocation L) { UnaryOperatorBits.Loc = L; }
2184
2185 /// Returns true if the unary operator can cause an overflow. For instance,
2186 /// signed int i = INT_MAX; i++;
2187 /// signed char c = CHAR_MAX; c++;
2188 /// Due to integer promotions, c++ is promoted to an int before the postfix
2189 /// increment, and the result is an int that cannot overflow. However, i++
2190 /// can overflow.
canOverflow()2191 bool canOverflow() const { return UnaryOperatorBits.CanOverflow; }
setCanOverflow(bool C)2192 void setCanOverflow(bool C) { UnaryOperatorBits.CanOverflow = C; }
2193
2194 // Get the FP contractability status of this operator. Only meaningful for
2195 // operations on floating point types.
isFPContractableWithinStatement(const LangOptions & LO)2196 bool isFPContractableWithinStatement(const LangOptions &LO) const {
2197 return getFPFeaturesInEffect(LO).allowFPContractWithinStatement();
2198 }
2199
2200 // Get the FENV_ACCESS status of this operator. Only meaningful for
2201 // operations on floating point types.
isFEnvAccessOn(const LangOptions & LO)2202 bool isFEnvAccessOn(const LangOptions &LO) const {
2203 return getFPFeaturesInEffect(LO).getAllowFEnvAccess();
2204 }
2205
2206 /// isPostfix - Return true if this is a postfix operation, like x++.
isPostfix(Opcode Op)2207 static bool isPostfix(Opcode Op) {
2208 return Op == UO_PostInc || Op == UO_PostDec;
2209 }
2210
2211 /// isPrefix - Return true if this is a prefix operation, like --x.
isPrefix(Opcode Op)2212 static bool isPrefix(Opcode Op) {
2213 return Op == UO_PreInc || Op == UO_PreDec;
2214 }
2215
isPrefix()2216 bool isPrefix() const { return isPrefix(getOpcode()); }
isPostfix()2217 bool isPostfix() const { return isPostfix(getOpcode()); }
2218
isIncrementOp(Opcode Op)2219 static bool isIncrementOp(Opcode Op) {
2220 return Op == UO_PreInc || Op == UO_PostInc;
2221 }
isIncrementOp()2222 bool isIncrementOp() const {
2223 return isIncrementOp(getOpcode());
2224 }
2225
isDecrementOp(Opcode Op)2226 static bool isDecrementOp(Opcode Op) {
2227 return Op == UO_PreDec || Op == UO_PostDec;
2228 }
isDecrementOp()2229 bool isDecrementOp() const {
2230 return isDecrementOp(getOpcode());
2231 }
2232
isIncrementDecrementOp(Opcode Op)2233 static bool isIncrementDecrementOp(Opcode Op) { return Op <= UO_PreDec; }
isIncrementDecrementOp()2234 bool isIncrementDecrementOp() const {
2235 return isIncrementDecrementOp(getOpcode());
2236 }
2237
isArithmeticOp(Opcode Op)2238 static bool isArithmeticOp(Opcode Op) {
2239 return Op >= UO_Plus && Op <= UO_LNot;
2240 }
isArithmeticOp()2241 bool isArithmeticOp() const { return isArithmeticOp(getOpcode()); }
2242
2243 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it
2244 /// corresponds to, e.g. "sizeof" or "[pre]++"
2245 static StringRef getOpcodeStr(Opcode Op);
2246
2247 /// Retrieve the unary opcode that corresponds to the given
2248 /// overloaded operator.
2249 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix);
2250
2251 /// Retrieve the overloaded operator kind that corresponds to
2252 /// the given unary opcode.
2253 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc);
2254
getBeginLoc()2255 SourceLocation getBeginLoc() const LLVM_READONLY {
2256 return isPostfix() ? Val->getBeginLoc() : getOperatorLoc();
2257 }
getEndLoc()2258 SourceLocation getEndLoc() const LLVM_READONLY {
2259 return isPostfix() ? getOperatorLoc() : Val->getEndLoc();
2260 }
getExprLoc()2261 SourceLocation getExprLoc() const { return getOperatorLoc(); }
2262
classof(const Stmt * T)2263 static bool classof(const Stmt *T) {
2264 return T->getStmtClass() == UnaryOperatorClass;
2265 }
2266
2267 // Iterators
children()2268 child_range children() { return child_range(&Val, &Val+1); }
children()2269 const_child_range children() const {
2270 return const_child_range(&Val, &Val + 1);
2271 }
2272
2273 /// Is FPFeatures in Trailing Storage?
hasStoredFPFeatures()2274 bool hasStoredFPFeatures() const { return UnaryOperatorBits.HasFPFeatures; }
2275
2276 protected:
2277 /// Get FPFeatures from trailing storage
getStoredFPFeatures()2278 FPOptionsOverride getStoredFPFeatures() const {
2279 return getTrailingFPFeatures();
2280 }
2281
2282 /// Set FPFeatures in trailing storage, used only by Serialization
setStoredFPFeatures(FPOptionsOverride F)2283 void setStoredFPFeatures(FPOptionsOverride F) { getTrailingFPFeatures() = F; }
2284
2285 public:
2286 // Get the FP features status of this operator. Only meaningful for
2287 // operations on floating point types.
getFPFeaturesInEffect(const LangOptions & LO)2288 FPOptions getFPFeaturesInEffect(const LangOptions &LO) const {
2289 if (UnaryOperatorBits.HasFPFeatures)
2290 return getStoredFPFeatures().applyOverrides(LO);
2291 return FPOptions::defaultWithoutTrailingStorage(LO);
2292 }
getFPOptionsOverride()2293 FPOptionsOverride getFPOptionsOverride() const {
2294 if (UnaryOperatorBits.HasFPFeatures)
2295 return getStoredFPFeatures();
2296 return FPOptionsOverride();
2297 }
2298
2299 friend TrailingObjects;
2300 friend class ASTReader;
2301 friend class ASTStmtReader;
2302 friend class ASTStmtWriter;
2303 };
2304
2305 /// Helper class for OffsetOfExpr.
2306
2307 // __builtin_offsetof(type, identifier(.identifier|[expr])*)
2308 class OffsetOfNode {
2309 public:
2310 /// The kind of offsetof node we have.
2311 enum Kind {
2312 /// An index into an array.
2313 Array = 0x00,
2314 /// A field.
2315 Field = 0x01,
2316 /// A field in a dependent type, known only by its name.
2317 Identifier = 0x02,
2318 /// An implicit indirection through a C++ base class, when the
2319 /// field found is in a base class.
2320 Base = 0x03
2321 };
2322
2323 private:
2324 enum { MaskBits = 2, Mask = 0x03 };
2325
2326 /// The source range that covers this part of the designator.
2327 SourceRange Range;
2328
2329 /// The data describing the designator, which comes in three
2330 /// different forms, depending on the lower two bits.
2331 /// - An unsigned index into the array of Expr*'s stored after this node
2332 /// in memory, for [constant-expression] designators.
2333 /// - A FieldDecl*, for references to a known field.
2334 /// - An IdentifierInfo*, for references to a field with a given name
2335 /// when the class type is dependent.
2336 /// - A CXXBaseSpecifier*, for references that look at a field in a
2337 /// base class.
2338 uintptr_t Data;
2339
2340 public:
2341 /// Create an offsetof node that refers to an array element.
OffsetOfNode(SourceLocation LBracketLoc,unsigned Index,SourceLocation RBracketLoc)2342 OffsetOfNode(SourceLocation LBracketLoc, unsigned Index,
2343 SourceLocation RBracketLoc)
2344 : Range(LBracketLoc, RBracketLoc), Data((Index << 2) | Array) {}
2345
2346 /// Create an offsetof node that refers to a field.
OffsetOfNode(SourceLocation DotLoc,FieldDecl * Field,SourceLocation NameLoc)2347 OffsetOfNode(SourceLocation DotLoc, FieldDecl *Field, SourceLocation NameLoc)
2348 : Range(DotLoc.isValid() ? DotLoc : NameLoc, NameLoc),
2349 Data(reinterpret_cast<uintptr_t>(Field) | OffsetOfNode::Field) {}
2350
2351 /// Create an offsetof node that refers to an identifier.
OffsetOfNode(SourceLocation DotLoc,IdentifierInfo * Name,SourceLocation NameLoc)2352 OffsetOfNode(SourceLocation DotLoc, IdentifierInfo *Name,
2353 SourceLocation NameLoc)
2354 : Range(DotLoc.isValid() ? DotLoc : NameLoc, NameLoc),
2355 Data(reinterpret_cast<uintptr_t>(Name) | Identifier) {}
2356
2357 /// Create an offsetof node that refers into a C++ base class.
OffsetOfNode(const CXXBaseSpecifier * Base)2358 explicit OffsetOfNode(const CXXBaseSpecifier *Base)
2359 : Range(), Data(reinterpret_cast<uintptr_t>(Base) | OffsetOfNode::Base) {}
2360
2361 /// Determine what kind of offsetof node this is.
getKind()2362 Kind getKind() const { return static_cast<Kind>(Data & Mask); }
2363
2364 /// For an array element node, returns the index into the array
2365 /// of expressions.
getArrayExprIndex()2366 unsigned getArrayExprIndex() const {
2367 assert(getKind() == Array);
2368 return Data >> 2;
2369 }
2370
2371 /// For a field offsetof node, returns the field.
getField()2372 FieldDecl *getField() const {
2373 assert(getKind() == Field);
2374 return reinterpret_cast<FieldDecl *>(Data & ~(uintptr_t)Mask);
2375 }
2376
2377 /// For a field or identifier offsetof node, returns the name of
2378 /// the field.
2379 IdentifierInfo *getFieldName() const;
2380
2381 /// For a base class node, returns the base specifier.
getBase()2382 CXXBaseSpecifier *getBase() const {
2383 assert(getKind() == Base);
2384 return reinterpret_cast<CXXBaseSpecifier *>(Data & ~(uintptr_t)Mask);
2385 }
2386
2387 /// Retrieve the source range that covers this offsetof node.
2388 ///
2389 /// For an array element node, the source range contains the locations of
2390 /// the square brackets. For a field or identifier node, the source range
2391 /// contains the location of the period (if there is one) and the
2392 /// identifier.
getSourceRange()2393 SourceRange getSourceRange() const LLVM_READONLY { return Range; }
getBeginLoc()2394 SourceLocation getBeginLoc() const LLVM_READONLY { return Range.getBegin(); }
getEndLoc()2395 SourceLocation getEndLoc() const LLVM_READONLY { return Range.getEnd(); }
2396 };
2397
2398 /// OffsetOfExpr - [C99 7.17] - This represents an expression of the form
2399 /// offsetof(record-type, member-designator). For example, given:
2400 /// @code
2401 /// struct S {
2402 /// float f;
2403 /// double d;
2404 /// };
2405 /// struct T {
2406 /// int i;
2407 /// struct S s[10];
2408 /// };
2409 /// @endcode
2410 /// we can represent and evaluate the expression @c offsetof(struct T, s[2].d).
2411
2412 class OffsetOfExpr final
2413 : public Expr,
2414 private llvm::TrailingObjects<OffsetOfExpr, OffsetOfNode, Expr *> {
2415 SourceLocation OperatorLoc, RParenLoc;
2416 // Base type;
2417 TypeSourceInfo *TSInfo;
2418 // Number of sub-components (i.e. instances of OffsetOfNode).
2419 unsigned NumComps;
2420 // Number of sub-expressions (i.e. array subscript expressions).
2421 unsigned NumExprs;
2422
numTrailingObjects(OverloadToken<OffsetOfNode>)2423 size_t numTrailingObjects(OverloadToken<OffsetOfNode>) const {
2424 return NumComps;
2425 }
2426
2427 OffsetOfExpr(const ASTContext &C, QualType type,
2428 SourceLocation OperatorLoc, TypeSourceInfo *tsi,
2429 ArrayRef<OffsetOfNode> comps, ArrayRef<Expr*> exprs,
2430 SourceLocation RParenLoc);
2431
OffsetOfExpr(unsigned numComps,unsigned numExprs)2432 explicit OffsetOfExpr(unsigned numComps, unsigned numExprs)
2433 : Expr(OffsetOfExprClass, EmptyShell()),
2434 TSInfo(nullptr), NumComps(numComps), NumExprs(numExprs) {}
2435
2436 public:
2437
2438 static OffsetOfExpr *Create(const ASTContext &C, QualType type,
2439 SourceLocation OperatorLoc, TypeSourceInfo *tsi,
2440 ArrayRef<OffsetOfNode> comps,
2441 ArrayRef<Expr*> exprs, SourceLocation RParenLoc);
2442
2443 static OffsetOfExpr *CreateEmpty(const ASTContext &C,
2444 unsigned NumComps, unsigned NumExprs);
2445
2446 /// getOperatorLoc - Return the location of the operator.
getOperatorLoc()2447 SourceLocation getOperatorLoc() const { return OperatorLoc; }
setOperatorLoc(SourceLocation L)2448 void setOperatorLoc(SourceLocation L) { OperatorLoc = L; }
2449
2450 /// Return the location of the right parentheses.
getRParenLoc()2451 SourceLocation getRParenLoc() const { return RParenLoc; }
setRParenLoc(SourceLocation R)2452 void setRParenLoc(SourceLocation R) { RParenLoc = R; }
2453
getTypeSourceInfo()2454 TypeSourceInfo *getTypeSourceInfo() const {
2455 return TSInfo;
2456 }
setTypeSourceInfo(TypeSourceInfo * tsi)2457 void setTypeSourceInfo(TypeSourceInfo *tsi) {
2458 TSInfo = tsi;
2459 }
2460
getComponent(unsigned Idx)2461 const OffsetOfNode &getComponent(unsigned Idx) const {
2462 assert(Idx < NumComps && "Subscript out of range");
2463 return getTrailingObjects<OffsetOfNode>()[Idx];
2464 }
2465
setComponent(unsigned Idx,OffsetOfNode ON)2466 void setComponent(unsigned Idx, OffsetOfNode ON) {
2467 assert(Idx < NumComps && "Subscript out of range");
2468 getTrailingObjects<OffsetOfNode>()[Idx] = ON;
2469 }
2470
getNumComponents()2471 unsigned getNumComponents() const {
2472 return NumComps;
2473 }
2474
getIndexExpr(unsigned Idx)2475 Expr* getIndexExpr(unsigned Idx) {
2476 assert(Idx < NumExprs && "Subscript out of range");
2477 return getTrailingObjects<Expr *>()[Idx];
2478 }
2479
getIndexExpr(unsigned Idx)2480 const Expr *getIndexExpr(unsigned Idx) const {
2481 assert(Idx < NumExprs && "Subscript out of range");
2482 return getTrailingObjects<Expr *>()[Idx];
2483 }
2484
setIndexExpr(unsigned Idx,Expr * E)2485 void setIndexExpr(unsigned Idx, Expr* E) {
2486 assert(Idx < NumComps && "Subscript out of range");
2487 getTrailingObjects<Expr *>()[Idx] = E;
2488 }
2489
getNumExpressions()2490 unsigned getNumExpressions() const {
2491 return NumExprs;
2492 }
2493
getBeginLoc()2494 SourceLocation getBeginLoc() const LLVM_READONLY { return OperatorLoc; }
getEndLoc()2495 SourceLocation getEndLoc() const LLVM_READONLY { return RParenLoc; }
2496
classof(const Stmt * T)2497 static bool classof(const Stmt *T) {
2498 return T->getStmtClass() == OffsetOfExprClass;
2499 }
2500
2501 // Iterators
children()2502 child_range children() {
2503 Stmt **begin = reinterpret_cast<Stmt **>(getTrailingObjects<Expr *>());
2504 return child_range(begin, begin + NumExprs);
2505 }
children()2506 const_child_range children() const {
2507 Stmt *const *begin =
2508 reinterpret_cast<Stmt *const *>(getTrailingObjects<Expr *>());
2509 return const_child_range(begin, begin + NumExprs);
2510 }
2511 friend TrailingObjects;
2512 };
2513
2514 /// UnaryExprOrTypeTraitExpr - expression with either a type or (unevaluated)
2515 /// expression operand. Used for sizeof/alignof (C99 6.5.3.4) and
2516 /// vec_step (OpenCL 1.1 6.11.12).
2517 class UnaryExprOrTypeTraitExpr : public Expr {
2518 union {
2519 TypeSourceInfo *Ty;
2520 Stmt *Ex;
2521 } Argument;
2522 SourceLocation OpLoc, RParenLoc;
2523
2524 public:
UnaryExprOrTypeTraitExpr(UnaryExprOrTypeTrait ExprKind,TypeSourceInfo * TInfo,QualType resultType,SourceLocation op,SourceLocation rp)2525 UnaryExprOrTypeTraitExpr(UnaryExprOrTypeTrait ExprKind, TypeSourceInfo *TInfo,
2526 QualType resultType, SourceLocation op,
2527 SourceLocation rp)
2528 : Expr(UnaryExprOrTypeTraitExprClass, resultType, VK_RValue, OK_Ordinary),
2529 OpLoc(op), RParenLoc(rp) {
2530 assert(ExprKind <= UETT_Last && "invalid enum value!");
2531 UnaryExprOrTypeTraitExprBits.Kind = ExprKind;
2532 assert(static_cast<unsigned>(ExprKind) ==
2533 UnaryExprOrTypeTraitExprBits.Kind &&
2534 "UnaryExprOrTypeTraitExprBits.Kind overflow!");
2535 UnaryExprOrTypeTraitExprBits.IsType = true;
2536 Argument.Ty = TInfo;
2537 setDependence(computeDependence(this));
2538 }
2539
2540 UnaryExprOrTypeTraitExpr(UnaryExprOrTypeTrait ExprKind, Expr *E,
2541 QualType resultType, SourceLocation op,
2542 SourceLocation rp);
2543
2544 /// Construct an empty sizeof/alignof expression.
UnaryExprOrTypeTraitExpr(EmptyShell Empty)2545 explicit UnaryExprOrTypeTraitExpr(EmptyShell Empty)
2546 : Expr(UnaryExprOrTypeTraitExprClass, Empty) { }
2547
getKind()2548 UnaryExprOrTypeTrait getKind() const {
2549 return static_cast<UnaryExprOrTypeTrait>(UnaryExprOrTypeTraitExprBits.Kind);
2550 }
setKind(UnaryExprOrTypeTrait K)2551 void setKind(UnaryExprOrTypeTrait K) {
2552 assert(K <= UETT_Last && "invalid enum value!");
2553 UnaryExprOrTypeTraitExprBits.Kind = K;
2554 assert(static_cast<unsigned>(K) == UnaryExprOrTypeTraitExprBits.Kind &&
2555 "UnaryExprOrTypeTraitExprBits.Kind overflow!");
2556 }
2557
isArgumentType()2558 bool isArgumentType() const { return UnaryExprOrTypeTraitExprBits.IsType; }
getArgumentType()2559 QualType getArgumentType() const {
2560 return getArgumentTypeInfo()->getType();
2561 }
getArgumentTypeInfo()2562 TypeSourceInfo *getArgumentTypeInfo() const {
2563 assert(isArgumentType() && "calling getArgumentType() when arg is expr");
2564 return Argument.Ty;
2565 }
getArgumentExpr()2566 Expr *getArgumentExpr() {
2567 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type");
2568 return static_cast<Expr*>(Argument.Ex);
2569 }
getArgumentExpr()2570 const Expr *getArgumentExpr() const {
2571 return const_cast<UnaryExprOrTypeTraitExpr*>(this)->getArgumentExpr();
2572 }
2573
setArgument(Expr * E)2574 void setArgument(Expr *E) {
2575 Argument.Ex = E;
2576 UnaryExprOrTypeTraitExprBits.IsType = false;
2577 }
setArgument(TypeSourceInfo * TInfo)2578 void setArgument(TypeSourceInfo *TInfo) {
2579 Argument.Ty = TInfo;
2580 UnaryExprOrTypeTraitExprBits.IsType = true;
2581 }
2582
2583 /// Gets the argument type, or the type of the argument expression, whichever
2584 /// is appropriate.
getTypeOfArgument()2585 QualType getTypeOfArgument() const {
2586 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType();
2587 }
2588
getOperatorLoc()2589 SourceLocation getOperatorLoc() const { return OpLoc; }
setOperatorLoc(SourceLocation L)2590 void setOperatorLoc(SourceLocation L) { OpLoc = L; }
2591
getRParenLoc()2592 SourceLocation getRParenLoc() const { return RParenLoc; }
setRParenLoc(SourceLocation L)2593 void setRParenLoc(SourceLocation L) { RParenLoc = L; }
2594
getBeginLoc()2595 SourceLocation getBeginLoc() const LLVM_READONLY { return OpLoc; }
getEndLoc()2596 SourceLocation getEndLoc() const LLVM_READONLY { return RParenLoc; }
2597
classof(const Stmt * T)2598 static bool classof(const Stmt *T) {
2599 return T->getStmtClass() == UnaryExprOrTypeTraitExprClass;
2600 }
2601
2602 // Iterators
2603 child_range children();
2604 const_child_range children() const;
2605 };
2606
2607 //===----------------------------------------------------------------------===//
2608 // Postfix Operators.
2609 //===----------------------------------------------------------------------===//
2610
2611 /// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting.
2612 class ArraySubscriptExpr : public Expr {
2613 enum { LHS, RHS, END_EXPR };
2614 Stmt *SubExprs[END_EXPR];
2615
lhsIsBase()2616 bool lhsIsBase() const { return getRHS()->getType()->isIntegerType(); }
2617
2618 public:
ArraySubscriptExpr(Expr * lhs,Expr * rhs,QualType t,ExprValueKind VK,ExprObjectKind OK,SourceLocation rbracketloc)2619 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, ExprValueKind VK,
2620 ExprObjectKind OK, SourceLocation rbracketloc)
2621 : Expr(ArraySubscriptExprClass, t, VK, OK) {
2622 SubExprs[LHS] = lhs;
2623 SubExprs[RHS] = rhs;
2624 ArrayOrMatrixSubscriptExprBits.RBracketLoc = rbracketloc;
2625 setDependence(computeDependence(this));
2626 }
2627
2628 /// Create an empty array subscript expression.
ArraySubscriptExpr(EmptyShell Shell)2629 explicit ArraySubscriptExpr(EmptyShell Shell)
2630 : Expr(ArraySubscriptExprClass, Shell) { }
2631
2632 /// An array access can be written A[4] or 4[A] (both are equivalent).
2633 /// - getBase() and getIdx() always present the normalized view: A[4].
2634 /// In this case getBase() returns "A" and getIdx() returns "4".
2635 /// - getLHS() and getRHS() present the syntactic view. e.g. for
2636 /// 4[A] getLHS() returns "4".
2637 /// Note: Because vector element access is also written A[4] we must
2638 /// predicate the format conversion in getBase and getIdx only on the
2639 /// the type of the RHS, as it is possible for the LHS to be a vector of
2640 /// integer type
getLHS()2641 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); }
getLHS()2642 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); }
setLHS(Expr * E)2643 void setLHS(Expr *E) { SubExprs[LHS] = E; }
2644
getRHS()2645 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); }
getRHS()2646 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); }
setRHS(Expr * E)2647 void setRHS(Expr *E) { SubExprs[RHS] = E; }
2648
getBase()2649 Expr *getBase() { return lhsIsBase() ? getLHS() : getRHS(); }
getBase()2650 const Expr *getBase() const { return lhsIsBase() ? getLHS() : getRHS(); }
2651
getIdx()2652 Expr *getIdx() { return lhsIsBase() ? getRHS() : getLHS(); }
getIdx()2653 const Expr *getIdx() const { return lhsIsBase() ? getRHS() : getLHS(); }
2654
getBeginLoc()2655 SourceLocation getBeginLoc() const LLVM_READONLY {
2656 return getLHS()->getBeginLoc();
2657 }
getEndLoc()2658 SourceLocation getEndLoc() const { return getRBracketLoc(); }
2659
getRBracketLoc()2660 SourceLocation getRBracketLoc() const {
2661 return ArrayOrMatrixSubscriptExprBits.RBracketLoc;
2662 }
setRBracketLoc(SourceLocation L)2663 void setRBracketLoc(SourceLocation L) {
2664 ArrayOrMatrixSubscriptExprBits.RBracketLoc = L;
2665 }
2666
getExprLoc()2667 SourceLocation getExprLoc() const LLVM_READONLY {
2668 return getBase()->getExprLoc();
2669 }
2670
classof(const Stmt * T)2671 static bool classof(const Stmt *T) {
2672 return T->getStmtClass() == ArraySubscriptExprClass;
2673 }
2674
2675 // Iterators
children()2676 child_range children() {
2677 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR);
2678 }
children()2679 const_child_range children() const {
2680 return const_child_range(&SubExprs[0], &SubExprs[0] + END_EXPR);
2681 }
2682 };
2683
2684 /// MatrixSubscriptExpr - Matrix subscript expression for the MatrixType
2685 /// extension.
2686 /// MatrixSubscriptExpr can be either incomplete (only Base and RowIdx are set
2687 /// so far, the type is IncompleteMatrixIdx) or complete (Base, RowIdx and
2688 /// ColumnIdx refer to valid expressions). Incomplete matrix expressions only
2689 /// exist during the initial construction of the AST.
2690 class MatrixSubscriptExpr : public Expr {
2691 enum { BASE, ROW_IDX, COLUMN_IDX, END_EXPR };
2692 Stmt *SubExprs[END_EXPR];
2693
2694 public:
MatrixSubscriptExpr(Expr * Base,Expr * RowIdx,Expr * ColumnIdx,QualType T,SourceLocation RBracketLoc)2695 MatrixSubscriptExpr(Expr *Base, Expr *RowIdx, Expr *ColumnIdx, QualType T,
2696 SourceLocation RBracketLoc)
2697 : Expr(MatrixSubscriptExprClass, T, Base->getValueKind(),
2698 OK_MatrixComponent) {
2699 SubExprs[BASE] = Base;
2700 SubExprs[ROW_IDX] = RowIdx;
2701 SubExprs[COLUMN_IDX] = ColumnIdx;
2702 ArrayOrMatrixSubscriptExprBits.RBracketLoc = RBracketLoc;
2703 setDependence(computeDependence(this));
2704 }
2705
2706 /// Create an empty matrix subscript expression.
MatrixSubscriptExpr(EmptyShell Shell)2707 explicit MatrixSubscriptExpr(EmptyShell Shell)
2708 : Expr(MatrixSubscriptExprClass, Shell) {}
2709
isIncomplete()2710 bool isIncomplete() const {
2711 bool IsIncomplete = hasPlaceholderType(BuiltinType::IncompleteMatrixIdx);
2712 assert((SubExprs[COLUMN_IDX] || IsIncomplete) &&
2713 "expressions without column index must be marked as incomplete");
2714 return IsIncomplete;
2715 }
getBase()2716 Expr *getBase() { return cast<Expr>(SubExprs[BASE]); }
getBase()2717 const Expr *getBase() const { return cast<Expr>(SubExprs[BASE]); }
setBase(Expr * E)2718 void setBase(Expr *E) { SubExprs[BASE] = E; }
2719
getRowIdx()2720 Expr *getRowIdx() { return cast<Expr>(SubExprs[ROW_IDX]); }
getRowIdx()2721 const Expr *getRowIdx() const { return cast<Expr>(SubExprs[ROW_IDX]); }
setRowIdx(Expr * E)2722 void setRowIdx(Expr *E) { SubExprs[ROW_IDX] = E; }
2723
getColumnIdx()2724 Expr *getColumnIdx() { return cast_or_null<Expr>(SubExprs[COLUMN_IDX]); }
getColumnIdx()2725 const Expr *getColumnIdx() const {
2726 assert(!isIncomplete() &&
2727 "cannot get the column index of an incomplete expression");
2728 return cast<Expr>(SubExprs[COLUMN_IDX]);
2729 }
setColumnIdx(Expr * E)2730 void setColumnIdx(Expr *E) { SubExprs[COLUMN_IDX] = E; }
2731
getBeginLoc()2732 SourceLocation getBeginLoc() const LLVM_READONLY {
2733 return getBase()->getBeginLoc();
2734 }
2735
getEndLoc()2736 SourceLocation getEndLoc() const { return getRBracketLoc(); }
2737
getExprLoc()2738 SourceLocation getExprLoc() const LLVM_READONLY {
2739 return getBase()->getExprLoc();
2740 }
2741
getRBracketLoc()2742 SourceLocation getRBracketLoc() const {
2743 return ArrayOrMatrixSubscriptExprBits.RBracketLoc;
2744 }
setRBracketLoc(SourceLocation L)2745 void setRBracketLoc(SourceLocation L) {
2746 ArrayOrMatrixSubscriptExprBits.RBracketLoc = L;
2747 }
2748
classof(const Stmt * T)2749 static bool classof(const Stmt *T) {
2750 return T->getStmtClass() == MatrixSubscriptExprClass;
2751 }
2752
2753 // Iterators
children()2754 child_range children() {
2755 return child_range(&SubExprs[0], &SubExprs[0] + END_EXPR);
2756 }
children()2757 const_child_range children() const {
2758 return const_child_range(&SubExprs[0], &SubExprs[0] + END_EXPR);
2759 }
2760 };
2761
2762 /// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]).
2763 /// CallExpr itself represents a normal function call, e.g., "f(x, 2)",
2764 /// while its subclasses may represent alternative syntax that (semantically)
2765 /// results in a function call. For example, CXXOperatorCallExpr is
2766 /// a subclass for overloaded operator calls that use operator syntax, e.g.,
2767 /// "str1 + str2" to resolve to a function call.
2768 class CallExpr : public Expr {
2769 enum { FN = 0, PREARGS_START = 1 };
2770
2771 /// The number of arguments in the call expression.
2772 unsigned NumArgs;
2773
2774 /// The location of the right parenthese. This has a different meaning for
2775 /// the derived classes of CallExpr.
2776 SourceLocation RParenLoc;
2777
2778 // CallExpr store some data in trailing objects. However since CallExpr
2779 // is used a base of other expression classes we cannot use
2780 // llvm::TrailingObjects. Instead we manually perform the pointer arithmetic
2781 // and casts.
2782 //
2783 // The trailing objects are in order:
2784 //
2785 // * A single "Stmt *" for the callee expression.
2786 //
2787 // * An array of getNumPreArgs() "Stmt *" for the pre-argument expressions.
2788 //
2789 // * An array of getNumArgs() "Stmt *" for the argument expressions.
2790 //
2791 // Note that we store the offset in bytes from the this pointer to the start
2792 // of the trailing objects. It would be perfectly possible to compute it
2793 // based on the dynamic kind of the CallExpr. However 1.) we have plenty of
2794 // space in the bit-fields of Stmt. 2.) It was benchmarked to be faster to
2795 // compute this once and then load the offset from the bit-fields of Stmt,
2796 // instead of re-computing the offset each time the trailing objects are
2797 // accessed.
2798
2799 /// Return a pointer to the start of the trailing array of "Stmt *".
getTrailingStmts()2800 Stmt **getTrailingStmts() {
2801 return reinterpret_cast<Stmt **>(reinterpret_cast<char *>(this) +
2802 CallExprBits.OffsetToTrailingObjects);
2803 }
getTrailingStmts()2804 Stmt *const *getTrailingStmts() const {
2805 return const_cast<CallExpr *>(this)->getTrailingStmts();
2806 }
2807
2808 /// Map a statement class to the appropriate offset in bytes from the
2809 /// this pointer to the trailing objects.
2810 static unsigned offsetToTrailingObjects(StmtClass SC);
2811
2812 public:
2813 enum class ADLCallKind : bool { NotADL, UsesADL };
2814 static constexpr ADLCallKind NotADL = ADLCallKind::NotADL;
2815 static constexpr ADLCallKind UsesADL = ADLCallKind::UsesADL;
2816
2817 protected:
2818 /// Build a call expression, assuming that appropriate storage has been
2819 /// allocated for the trailing objects.
2820 CallExpr(StmtClass SC, Expr *Fn, ArrayRef<Expr *> PreArgs,
2821 ArrayRef<Expr *> Args, QualType Ty, ExprValueKind VK,
2822 SourceLocation RParenLoc, unsigned MinNumArgs, ADLCallKind UsesADL);
2823
2824 /// Build an empty call expression, for deserialization.
2825 CallExpr(StmtClass SC, unsigned NumPreArgs, unsigned NumArgs,
2826 EmptyShell Empty);
2827
2828 /// Return the size in bytes needed for the trailing objects.
2829 /// Used by the derived classes to allocate the right amount of storage.
sizeOfTrailingObjects(unsigned NumPreArgs,unsigned NumArgs)2830 static unsigned sizeOfTrailingObjects(unsigned NumPreArgs, unsigned NumArgs) {
2831 return (1 + NumPreArgs + NumArgs) * sizeof(Stmt *);
2832 }
2833
getPreArg(unsigned I)2834 Stmt *getPreArg(unsigned I) {
2835 assert(I < getNumPreArgs() && "Prearg access out of range!");
2836 return getTrailingStmts()[PREARGS_START + I];
2837 }
getPreArg(unsigned I)2838 const Stmt *getPreArg(unsigned I) const {
2839 assert(I < getNumPreArgs() && "Prearg access out of range!");
2840 return getTrailingStmts()[PREARGS_START + I];
2841 }
setPreArg(unsigned I,Stmt * PreArg)2842 void setPreArg(unsigned I, Stmt *PreArg) {
2843 assert(I < getNumPreArgs() && "Prearg access out of range!");
2844 getTrailingStmts()[PREARGS_START + I] = PreArg;
2845 }
2846
getNumPreArgs()2847 unsigned getNumPreArgs() const { return CallExprBits.NumPreArgs; }
2848
2849 public:
2850 /// Create a call expression. Fn is the callee expression, Args is the
2851 /// argument array, Ty is the type of the call expression (which is *not*
2852 /// the return type in general), VK is the value kind of the call expression
2853 /// (lvalue, rvalue, ...), and RParenLoc is the location of the right
2854 /// parenthese in the call expression. MinNumArgs specifies the minimum
2855 /// number of arguments. The actual number of arguments will be the greater
2856 /// of Args.size() and MinNumArgs. This is used in a few places to allocate
2857 /// enough storage for the default arguments. UsesADL specifies whether the
2858 /// callee was found through argument-dependent lookup.
2859 ///
2860 /// Note that you can use CreateTemporary if you need a temporary call
2861 /// expression on the stack.
2862 static CallExpr *Create(const ASTContext &Ctx, Expr *Fn,
2863 ArrayRef<Expr *> Args, QualType Ty, ExprValueKind VK,
2864 SourceLocation RParenLoc, unsigned MinNumArgs = 0,
2865 ADLCallKind UsesADL = NotADL);
2866
2867 /// Create a temporary call expression with no arguments in the memory
2868 /// pointed to by Mem. Mem must points to at least sizeof(CallExpr)
2869 /// + sizeof(Stmt *) bytes of storage, aligned to alignof(CallExpr):
2870 ///
2871 /// \code{.cpp}
2872 /// alignas(CallExpr) char Buffer[sizeof(CallExpr) + sizeof(Stmt *)];
2873 /// CallExpr *TheCall = CallExpr::CreateTemporary(Buffer, etc);
2874 /// \endcode
2875 static CallExpr *CreateTemporary(void *Mem, Expr *Fn, QualType Ty,
2876 ExprValueKind VK, SourceLocation RParenLoc,
2877 ADLCallKind UsesADL = NotADL);
2878
2879 /// Create an empty call expression, for deserialization.
2880 static CallExpr *CreateEmpty(const ASTContext &Ctx, unsigned NumArgs,
2881 EmptyShell Empty);
2882
getCallee()2883 Expr *getCallee() { return cast<Expr>(getTrailingStmts()[FN]); }
getCallee()2884 const Expr *getCallee() const { return cast<Expr>(getTrailingStmts()[FN]); }
setCallee(Expr * F)2885 void setCallee(Expr *F) { getTrailingStmts()[FN] = F; }
2886
getADLCallKind()2887 ADLCallKind getADLCallKind() const {
2888 return static_cast<ADLCallKind>(CallExprBits.UsesADL);
2889 }
2890 void setADLCallKind(ADLCallKind V = UsesADL) {
2891 CallExprBits.UsesADL = static_cast<bool>(V);
2892 }
usesADL()2893 bool usesADL() const { return getADLCallKind() == UsesADL; }
2894
getCalleeDecl()2895 Decl *getCalleeDecl() { return getCallee()->getReferencedDeclOfCallee(); }
getCalleeDecl()2896 const Decl *getCalleeDecl() const {
2897 return getCallee()->getReferencedDeclOfCallee();
2898 }
2899
2900 /// If the callee is a FunctionDecl, return it. Otherwise return null.
getDirectCallee()2901 FunctionDecl *getDirectCallee() {
2902 return dyn_cast_or_null<FunctionDecl>(getCalleeDecl());
2903 }
getDirectCallee()2904 const FunctionDecl *getDirectCallee() const {
2905 return dyn_cast_or_null<FunctionDecl>(getCalleeDecl());
2906 }
2907
2908 /// getNumArgs - Return the number of actual arguments to this call.
getNumArgs()2909 unsigned getNumArgs() const { return NumArgs; }
2910
2911 /// Retrieve the call arguments.
getArgs()2912 Expr **getArgs() {
2913 return reinterpret_cast<Expr **>(getTrailingStmts() + PREARGS_START +
2914 getNumPreArgs());
2915 }
getArgs()2916 const Expr *const *getArgs() const {
2917 return reinterpret_cast<const Expr *const *>(
2918 getTrailingStmts() + PREARGS_START + getNumPreArgs());
2919 }
2920
2921 /// getArg - Return the specified argument.
getArg(unsigned Arg)2922 Expr *getArg(unsigned Arg) {
2923 assert(Arg < getNumArgs() && "Arg access out of range!");
2924 return getArgs()[Arg];
2925 }
getArg(unsigned Arg)2926 const Expr *getArg(unsigned Arg) const {
2927 assert(Arg < getNumArgs() && "Arg access out of range!");
2928 return getArgs()[Arg];
2929 }
2930
2931 /// setArg - Set the specified argument.
setArg(unsigned Arg,Expr * ArgExpr)2932 void setArg(unsigned Arg, Expr *ArgExpr) {
2933 assert(Arg < getNumArgs() && "Arg access out of range!");
2934 getArgs()[Arg] = ArgExpr;
2935 }
2936
2937 /// Reduce the number of arguments in this call expression. This is used for
2938 /// example during error recovery to drop extra arguments. There is no way
2939 /// to perform the opposite because: 1.) We don't track how much storage
2940 /// we have for the argument array 2.) This would potentially require growing
2941 /// the argument array, something we cannot support since the arguments are
2942 /// stored in a trailing array.
shrinkNumArgs(unsigned NewNumArgs)2943 void shrinkNumArgs(unsigned NewNumArgs) {
2944 assert((NewNumArgs <= getNumArgs()) &&
2945 "shrinkNumArgs cannot increase the number of arguments!");
2946 NumArgs = NewNumArgs;
2947 }
2948
2949 /// Bluntly set a new number of arguments without doing any checks whatsoever.
2950 /// Only used during construction of a CallExpr in a few places in Sema.
2951 /// FIXME: Find a way to remove it.
setNumArgsUnsafe(unsigned NewNumArgs)2952 void setNumArgsUnsafe(unsigned NewNumArgs) { NumArgs = NewNumArgs; }
2953
2954 typedef ExprIterator arg_iterator;
2955 typedef ConstExprIterator const_arg_iterator;
2956 typedef llvm::iterator_range<arg_iterator> arg_range;
2957 typedef llvm::iterator_range<const_arg_iterator> const_arg_range;
2958
arguments()2959 arg_range arguments() { return arg_range(arg_begin(), arg_end()); }
arguments()2960 const_arg_range arguments() const {
2961 return const_arg_range(arg_begin(), arg_end());
2962 }
2963
arg_begin()2964 arg_iterator arg_begin() {
2965 return getTrailingStmts() + PREARGS_START + getNumPreArgs();
2966 }
arg_end()2967 arg_iterator arg_end() { return arg_begin() + getNumArgs(); }
2968
arg_begin()2969 const_arg_iterator arg_begin() const {
2970 return getTrailingStmts() + PREARGS_START + getNumPreArgs();
2971 }
arg_end()2972 const_arg_iterator arg_end() const { return arg_begin() + getNumArgs(); }
2973
2974 /// This method provides fast access to all the subexpressions of
2975 /// a CallExpr without going through the slower virtual child_iterator
2976 /// interface. This provides efficient reverse iteration of the
2977 /// subexpressions. This is currently used for CFG construction.
getRawSubExprs()2978 ArrayRef<Stmt *> getRawSubExprs() {
2979 return llvm::makeArrayRef(getTrailingStmts(),
2980 PREARGS_START + getNumPreArgs() + getNumArgs());
2981 }
2982
2983 /// getNumCommas - Return the number of commas that must have been present in
2984 /// this function call.
getNumCommas()2985 unsigned getNumCommas() const { return getNumArgs() ? getNumArgs() - 1 : 0; }
2986
2987 /// getBuiltinCallee - If this is a call to a builtin, return the builtin ID
2988 /// of the callee. If not, return 0.
2989 unsigned getBuiltinCallee() const;
2990
2991 /// Returns \c true if this is a call to a builtin which does not
2992 /// evaluate side-effects within its arguments.
2993 bool isUnevaluatedBuiltinCall(const ASTContext &Ctx) const;
2994
2995 /// getCallReturnType - Get the return type of the call expr. This is not
2996 /// always the type of the expr itself, if the return type is a reference
2997 /// type.
2998 QualType getCallReturnType(const ASTContext &Ctx) const;
2999
3000 /// Returns the WarnUnusedResultAttr that is either declared on the called
3001 /// function, or its return type declaration.
3002 const Attr *getUnusedResultAttr(const ASTContext &Ctx) const;
3003
3004 /// Returns true if this call expression should warn on unused results.
hasUnusedResultAttr(const ASTContext & Ctx)3005 bool hasUnusedResultAttr(const ASTContext &Ctx) const {
3006 return getUnusedResultAttr(Ctx) != nullptr;
3007 }
3008
getRParenLoc()3009 SourceLocation getRParenLoc() const { return RParenLoc; }
setRParenLoc(SourceLocation L)3010 void setRParenLoc(SourceLocation L) { RParenLoc = L; }
3011
3012 SourceLocation getBeginLoc() const LLVM_READONLY;
3013 SourceLocation getEndLoc() const LLVM_READONLY;
3014
3015 /// Return true if this is a call to __assume() or __builtin_assume() with
3016 /// a non-value-dependent constant parameter evaluating as false.
3017 bool isBuiltinAssumeFalse(const ASTContext &Ctx) const;
3018
3019 /// Used by Sema to implement MSVC-compatible delayed name lookup.
3020 /// (Usually Exprs themselves should set dependence).
markDependentForPostponedNameLookup()3021 void markDependentForPostponedNameLookup() {
3022 setDependence(getDependence() | ExprDependence::TypeValueInstantiation);
3023 }
3024
isCallToStdMove()3025 bool isCallToStdMove() const {
3026 const FunctionDecl *FD = getDirectCallee();
3027 return getNumArgs() == 1 && FD && FD->isInStdNamespace() &&
3028 FD->getIdentifier() && FD->getIdentifier()->isStr("move");
3029 }
3030
classof(const Stmt * T)3031 static bool classof(const Stmt *T) {
3032 return T->getStmtClass() >= firstCallExprConstant &&
3033 T->getStmtClass() <= lastCallExprConstant;
3034 }
3035
3036 // Iterators
children()3037 child_range children() {
3038 return child_range(getTrailingStmts(), getTrailingStmts() + PREARGS_START +
3039 getNumPreArgs() + getNumArgs());
3040 }
3041
children()3042 const_child_range children() const {
3043 return const_child_range(getTrailingStmts(),
3044 getTrailingStmts() + PREARGS_START +
3045 getNumPreArgs() + getNumArgs());
3046 }
3047 };
3048
3049 /// Extra data stored in some MemberExpr objects.
3050 struct MemberExprNameQualifier {
3051 /// The nested-name-specifier that qualifies the name, including
3052 /// source-location information.
3053 NestedNameSpecifierLoc QualifierLoc;
3054
3055 /// The DeclAccessPair through which the MemberDecl was found due to
3056 /// name qualifiers.
3057 DeclAccessPair FoundDecl;
3058 };
3059
3060 /// MemberExpr - [C99 6.5.2.3] Structure and Union Members. X->F and X.F.
3061 ///
3062 class MemberExpr final
3063 : public Expr,
3064 private llvm::TrailingObjects<MemberExpr, MemberExprNameQualifier,
3065 ASTTemplateKWAndArgsInfo,
3066 TemplateArgumentLoc> {
3067 friend class ASTReader;
3068 friend class ASTStmtReader;
3069 friend class ASTStmtWriter;
3070 friend TrailingObjects;
3071
3072 /// Base - the expression for the base pointer or structure references. In
3073 /// X.F, this is "X".
3074 Stmt *Base;
3075
3076 /// MemberDecl - This is the decl being referenced by the field/member name.
3077 /// In X.F, this is the decl referenced by F.
3078 ValueDecl *MemberDecl;
3079
3080 /// MemberDNLoc - Provides source/type location info for the
3081 /// declaration name embedded in MemberDecl.
3082 DeclarationNameLoc MemberDNLoc;
3083
3084 /// MemberLoc - This is the location of the member name.
3085 SourceLocation MemberLoc;
3086
numTrailingObjects(OverloadToken<MemberExprNameQualifier>)3087 size_t numTrailingObjects(OverloadToken<MemberExprNameQualifier>) const {
3088 return hasQualifierOrFoundDecl();
3089 }
3090
numTrailingObjects(OverloadToken<ASTTemplateKWAndArgsInfo>)3091 size_t numTrailingObjects(OverloadToken<ASTTemplateKWAndArgsInfo>) const {
3092 return hasTemplateKWAndArgsInfo();
3093 }
3094
hasQualifierOrFoundDecl()3095 bool hasQualifierOrFoundDecl() const {
3096 return MemberExprBits.HasQualifierOrFoundDecl;
3097 }
3098
hasTemplateKWAndArgsInfo()3099 bool hasTemplateKWAndArgsInfo() const {
3100 return MemberExprBits.HasTemplateKWAndArgsInfo;
3101 }
3102
3103 MemberExpr(Expr *Base, bool IsArrow, SourceLocation OperatorLoc,
3104 ValueDecl *MemberDecl, const DeclarationNameInfo &NameInfo,
3105 QualType T, ExprValueKind VK, ExprObjectKind OK,
3106 NonOdrUseReason NOUR);
MemberExpr(EmptyShell Empty)3107 MemberExpr(EmptyShell Empty)
3108 : Expr(MemberExprClass, Empty), Base(), MemberDecl() {}
3109
3110 public:
3111 static MemberExpr *Create(const ASTContext &C, Expr *Base, bool IsArrow,
3112 SourceLocation OperatorLoc,
3113 NestedNameSpecifierLoc QualifierLoc,
3114 SourceLocation TemplateKWLoc, ValueDecl *MemberDecl,
3115 DeclAccessPair FoundDecl,
3116 DeclarationNameInfo MemberNameInfo,
3117 const TemplateArgumentListInfo *TemplateArgs,
3118 QualType T, ExprValueKind VK, ExprObjectKind OK,
3119 NonOdrUseReason NOUR);
3120
3121 /// Create an implicit MemberExpr, with no location, qualifier, template
3122 /// arguments, and so on. Suitable only for non-static member access.
CreateImplicit(const ASTContext & C,Expr * Base,bool IsArrow,ValueDecl * MemberDecl,QualType T,ExprValueKind VK,ExprObjectKind OK)3123 static MemberExpr *CreateImplicit(const ASTContext &C, Expr *Base,
3124 bool IsArrow, ValueDecl *MemberDecl,
3125 QualType T, ExprValueKind VK,
3126 ExprObjectKind OK) {
3127 return Create(C, Base, IsArrow, SourceLocation(), NestedNameSpecifierLoc(),
3128 SourceLocation(), MemberDecl,
3129 DeclAccessPair::make(MemberDecl, MemberDecl->getAccess()),
3130 DeclarationNameInfo(), nullptr, T, VK, OK, NOUR_None);
3131 }
3132
3133 static MemberExpr *CreateEmpty(const ASTContext &Context, bool HasQualifier,
3134 bool HasFoundDecl,
3135 bool HasTemplateKWAndArgsInfo,
3136 unsigned NumTemplateArgs);
3137
setBase(Expr * E)3138 void setBase(Expr *E) { Base = E; }
getBase()3139 Expr *getBase() const { return cast<Expr>(Base); }
3140
3141 /// Retrieve the member declaration to which this expression refers.
3142 ///
3143 /// The returned declaration will be a FieldDecl or (in C++) a VarDecl (for
3144 /// static data members), a CXXMethodDecl, or an EnumConstantDecl.
getMemberDecl()3145 ValueDecl *getMemberDecl() const { return MemberDecl; }
setMemberDecl(ValueDecl * D)3146 void setMemberDecl(ValueDecl *D) { MemberDecl = D; }
3147
3148 /// Retrieves the declaration found by lookup.
getFoundDecl()3149 DeclAccessPair getFoundDecl() const {
3150 if (!hasQualifierOrFoundDecl())
3151 return DeclAccessPair::make(getMemberDecl(),
3152 getMemberDecl()->getAccess());
3153 return getTrailingObjects<MemberExprNameQualifier>()->FoundDecl;
3154 }
3155
3156 /// Determines whether this member expression actually had
3157 /// a C++ nested-name-specifier prior to the name of the member, e.g.,
3158 /// x->Base::foo.
hasQualifier()3159 bool hasQualifier() const { return getQualifier() != nullptr; }
3160
3161 /// If the member name was qualified, retrieves the
3162 /// nested-name-specifier that precedes the member name, with source-location
3163 /// information.
getQualifierLoc()3164 NestedNameSpecifierLoc getQualifierLoc() const {
3165 if (!hasQualifierOrFoundDecl())
3166 return NestedNameSpecifierLoc();
3167 return getTrailingObjects<MemberExprNameQualifier>()->QualifierLoc;
3168 }
3169
3170 /// If the member name was qualified, retrieves the
3171 /// nested-name-specifier that precedes the member name. Otherwise, returns
3172 /// NULL.
getQualifier()3173 NestedNameSpecifier *getQualifier() const {
3174 return getQualifierLoc().getNestedNameSpecifier();
3175 }
3176
3177 /// Retrieve the location of the template keyword preceding
3178 /// the member name, if any.
getTemplateKeywordLoc()3179 SourceLocation getTemplateKeywordLoc() const {
3180 if (!hasTemplateKWAndArgsInfo())
3181 return SourceLocation();
3182 return getTrailingObjects<ASTTemplateKWAndArgsInfo>()->TemplateKWLoc;
3183 }
3184
3185 /// Retrieve the location of the left angle bracket starting the
3186 /// explicit template argument list following the member name, if any.
getLAngleLoc()3187 SourceLocation getLAngleLoc() const {
3188 if (!hasTemplateKWAndArgsInfo())
3189 return SourceLocation();
3190 return getTrailingObjects<ASTTemplateKWAndArgsInfo>()->LAngleLoc;
3191 }
3192
3193 /// Retrieve the location of the right angle bracket ending the
3194 /// explicit template argument list following the member name, if any.
getRAngleLoc()3195 SourceLocation getRAngleLoc() const {
3196 if (!hasTemplateKWAndArgsInfo())
3197 return SourceLocation();
3198 return getTrailingObjects<ASTTemplateKWAndArgsInfo>()->RAngleLoc;
3199 }
3200
3201 /// Determines whether the member name was preceded by the template keyword.
hasTemplateKeyword()3202 bool hasTemplateKeyword() const { return getTemplateKeywordLoc().isValid(); }
3203
3204 /// Determines whether the member name was followed by an
3205 /// explicit template argument list.
hasExplicitTemplateArgs()3206 bool hasExplicitTemplateArgs() const { return getLAngleLoc().isValid(); }
3207
3208 /// Copies the template arguments (if present) into the given
3209 /// structure.
copyTemplateArgumentsInto(TemplateArgumentListInfo & List)3210 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const {
3211 if (hasExplicitTemplateArgs())
3212 getTrailingObjects<ASTTemplateKWAndArgsInfo>()->copyInto(
3213 getTrailingObjects<TemplateArgumentLoc>(), List);
3214 }
3215
3216 /// Retrieve the template arguments provided as part of this
3217 /// template-id.
getTemplateArgs()3218 const TemplateArgumentLoc *getTemplateArgs() const {
3219 if (!hasExplicitTemplateArgs())
3220 return nullptr;
3221
3222 return getTrailingObjects<TemplateArgumentLoc>();
3223 }
3224
3225 /// Retrieve the number of template arguments provided as part of this
3226 /// template-id.
getNumTemplateArgs()3227 unsigned getNumTemplateArgs() const {
3228 if (!hasExplicitTemplateArgs())
3229 return 0;
3230
3231 return getTrailingObjects<ASTTemplateKWAndArgsInfo>()->NumTemplateArgs;
3232 }
3233
template_arguments()3234 ArrayRef<TemplateArgumentLoc> template_arguments() const {
3235 return {getTemplateArgs(), getNumTemplateArgs()};
3236 }
3237
3238 /// Retrieve the member declaration name info.
getMemberNameInfo()3239 DeclarationNameInfo getMemberNameInfo() const {
3240 return DeclarationNameInfo(MemberDecl->getDeclName(),
3241 MemberLoc, MemberDNLoc);
3242 }
3243
getOperatorLoc()3244 SourceLocation getOperatorLoc() const { return MemberExprBits.OperatorLoc; }
3245
isArrow()3246 bool isArrow() const { return MemberExprBits.IsArrow; }
setArrow(bool A)3247 void setArrow(bool A) { MemberExprBits.IsArrow = A; }
3248
3249 /// getMemberLoc - Return the location of the "member", in X->F, it is the
3250 /// location of 'F'.
getMemberLoc()3251 SourceLocation getMemberLoc() const { return MemberLoc; }
setMemberLoc(SourceLocation L)3252 void setMemberLoc(SourceLocation L) { MemberLoc = L; }
3253
3254 SourceLocation getBeginLoc() const LLVM_READONLY;
3255 SourceLocation getEndLoc() const LLVM_READONLY;
3256
getExprLoc()3257 SourceLocation getExprLoc() const LLVM_READONLY { return MemberLoc; }
3258
3259 /// Determine whether the base of this explicit is implicit.
isImplicitAccess()3260 bool isImplicitAccess() const {
3261 return getBase() && getBase()->isImplicitCXXThis();
3262 }
3263
3264 /// Returns true if this member expression refers to a method that
3265 /// was resolved from an overloaded set having size greater than 1.
hadMultipleCandidates()3266 bool hadMultipleCandidates() const {
3267 return MemberExprBits.HadMultipleCandidates;
3268 }
3269 /// Sets the flag telling whether this expression refers to
3270 /// a method that was resolved from an overloaded set having size
3271 /// greater than 1.
3272 void setHadMultipleCandidates(bool V = true) {
3273 MemberExprBits.HadMultipleCandidates = V;
3274 }
3275
3276 /// Returns true if virtual dispatch is performed.
3277 /// If the member access is fully qualified, (i.e. X::f()), virtual
3278 /// dispatching is not performed. In -fapple-kext mode qualified
3279 /// calls to virtual method will still go through the vtable.
performsVirtualDispatch(const LangOptions & LO)3280 bool performsVirtualDispatch(const LangOptions &LO) const {
3281 return LO.AppleKext || !hasQualifier();
3282 }
3283
3284 /// Is this expression a non-odr-use reference, and if so, why?
3285 /// This is only meaningful if the named member is a static member.
isNonOdrUse()3286 NonOdrUseReason isNonOdrUse() const {
3287 return static_cast<NonOdrUseReason>(MemberExprBits.NonOdrUseReason);
3288 }
3289
classof(const Stmt * T)3290 static bool classof(const Stmt *T) {
3291 return T->getStmtClass() == MemberExprClass;
3292 }
3293
3294 // Iterators
children()3295 child_range children() { return child_range(&Base, &Base+1); }
children()3296 const_child_range children() const {
3297 return const_child_range(&Base, &Base + 1);
3298 }
3299 };
3300
3301 /// CompoundLiteralExpr - [C99 6.5.2.5]
3302 ///
3303 class CompoundLiteralExpr : public Expr {
3304 /// LParenLoc - If non-null, this is the location of the left paren in a
3305 /// compound literal like "(int){4}". This can be null if this is a
3306 /// synthesized compound expression.
3307 SourceLocation LParenLoc;
3308
3309 /// The type as written. This can be an incomplete array type, in
3310 /// which case the actual expression type will be different.
3311 /// The int part of the pair stores whether this expr is file scope.
3312 llvm::PointerIntPair<TypeSourceInfo *, 1, bool> TInfoAndScope;
3313 Stmt *Init;
3314 public:
CompoundLiteralExpr(SourceLocation lparenloc,TypeSourceInfo * tinfo,QualType T,ExprValueKind VK,Expr * init,bool fileScope)3315 CompoundLiteralExpr(SourceLocation lparenloc, TypeSourceInfo *tinfo,
3316 QualType T, ExprValueKind VK, Expr *init, bool fileScope)
3317 : Expr(CompoundLiteralExprClass, T, VK, OK_Ordinary),
3318 LParenLoc(lparenloc), TInfoAndScope(tinfo, fileScope), Init(init) {
3319 setDependence(computeDependence(this));
3320 }
3321
3322 /// Construct an empty compound literal.
CompoundLiteralExpr(EmptyShell Empty)3323 explicit CompoundLiteralExpr(EmptyShell Empty)
3324 : Expr(CompoundLiteralExprClass, Empty) { }
3325
getInitializer()3326 const Expr *getInitializer() const { return cast<Expr>(Init); }
getInitializer()3327 Expr *getInitializer() { return cast<Expr>(Init); }
setInitializer(Expr * E)3328 void setInitializer(Expr *E) { Init = E; }
3329
isFileScope()3330 bool isFileScope() const { return TInfoAndScope.getInt(); }
setFileScope(bool FS)3331 void setFileScope(bool FS) { TInfoAndScope.setInt(FS); }
3332
getLParenLoc()3333 SourceLocation getLParenLoc() const { return LParenLoc; }
setLParenLoc(SourceLocation L)3334 void setLParenLoc(SourceLocation L) { LParenLoc = L; }
3335
getTypeSourceInfo()3336 TypeSourceInfo *getTypeSourceInfo() const {
3337 return TInfoAndScope.getPointer();
3338 }
setTypeSourceInfo(TypeSourceInfo * tinfo)3339 void setTypeSourceInfo(TypeSourceInfo *tinfo) {
3340 TInfoAndScope.setPointer(tinfo);
3341 }
3342
getBeginLoc()3343 SourceLocation getBeginLoc() const LLVM_READONLY {
3344 // FIXME: Init should never be null.
3345 if (!Init)
3346 return SourceLocation();
3347 if (LParenLoc.isInvalid())
3348 return Init->getBeginLoc();
3349 return LParenLoc;
3350 }
getEndLoc()3351 SourceLocation getEndLoc() const LLVM_READONLY {
3352 // FIXME: Init should never be null.
3353 if (!Init)
3354 return SourceLocation();
3355 return Init->getEndLoc();
3356 }
3357
classof(const Stmt * T)3358 static bool classof(const Stmt *T) {
3359 return T->getStmtClass() == CompoundLiteralExprClass;
3360 }
3361
3362 // Iterators
children()3363 child_range children() { return child_range(&Init, &Init+1); }
children()3364 const_child_range children() const {
3365 return const_child_range(&Init, &Init + 1);
3366 }
3367 };
3368
3369 /// CastExpr - Base class for type casts, including both implicit
3370 /// casts (ImplicitCastExpr) and explicit casts that have some
3371 /// representation in the source code (ExplicitCastExpr's derived
3372 /// classes).
3373 class CastExpr : public Expr {
3374 Stmt *Op;
3375
3376 bool CastConsistency() const;
3377
path_buffer()3378 const CXXBaseSpecifier * const *path_buffer() const {
3379 return const_cast<CastExpr*>(this)->path_buffer();
3380 }
3381 CXXBaseSpecifier **path_buffer();
3382
3383 protected:
CastExpr(StmtClass SC,QualType ty,ExprValueKind VK,const CastKind kind,Expr * op,unsigned BasePathSize)3384 CastExpr(StmtClass SC, QualType ty, ExprValueKind VK, const CastKind kind,
3385 Expr *op, unsigned BasePathSize)
3386 : Expr(SC, ty, VK, OK_Ordinary), Op(op) {
3387 CastExprBits.Kind = kind;
3388 CastExprBits.PartOfExplicitCast = false;
3389 CastExprBits.BasePathSize = BasePathSize;
3390 assert((CastExprBits.BasePathSize == BasePathSize) &&
3391 "BasePathSize overflow!");
3392 setDependence(computeDependence(this));
3393 assert(CastConsistency());
3394 }
3395
3396 /// Construct an empty cast.
CastExpr(StmtClass SC,EmptyShell Empty,unsigned BasePathSize)3397 CastExpr(StmtClass SC, EmptyShell Empty, unsigned BasePathSize)
3398 : Expr(SC, Empty) {
3399 CastExprBits.PartOfExplicitCast = false;
3400 CastExprBits.BasePathSize = BasePathSize;
3401 assert((CastExprBits.BasePathSize == BasePathSize) &&
3402 "BasePathSize overflow!");
3403 }
3404
3405 public:
getCastKind()3406 CastKind getCastKind() const { return (CastKind) CastExprBits.Kind; }
setCastKind(CastKind K)3407 void setCastKind(CastKind K) { CastExprBits.Kind = K; }
3408
3409 static const char *getCastKindName(CastKind CK);
getCastKindName()3410 const char *getCastKindName() const { return getCastKindName(getCastKind()); }
3411
getSubExpr()3412 Expr *getSubExpr() { return cast<Expr>(Op); }
getSubExpr()3413 const Expr *getSubExpr() const { return cast<Expr>(Op); }
setSubExpr(Expr * E)3414 void setSubExpr(Expr *E) { Op = E; }
3415
3416 /// Retrieve the cast subexpression as it was written in the source
3417 /// code, looking through any implicit casts or other intermediate nodes
3418 /// introduced by semantic analysis.
3419 Expr *getSubExprAsWritten();
getSubExprAsWritten()3420 const Expr *getSubExprAsWritten() const {
3421 return const_cast<CastExpr *>(this)->getSubExprAsWritten();
3422 }
3423
3424 /// If this cast applies a user-defined conversion, retrieve the conversion
3425 /// function that it invokes.
3426 NamedDecl *getConversionFunction() const;
3427
3428 typedef CXXBaseSpecifier **path_iterator;
3429 typedef const CXXBaseSpecifier *const *path_const_iterator;
path_empty()3430 bool path_empty() const { return path_size() == 0; }
path_size()3431 unsigned path_size() const { return CastExprBits.BasePathSize; }
path_begin()3432 path_iterator path_begin() { return path_buffer(); }
path_end()3433 path_iterator path_end() { return path_buffer() + path_size(); }
path_begin()3434 path_const_iterator path_begin() const { return path_buffer(); }
path_end()3435 path_const_iterator path_end() const { return path_buffer() + path_size(); }
3436
path()3437 llvm::iterator_range<path_iterator> path() {
3438 return llvm::make_range(path_begin(), path_end());
3439 }
path()3440 llvm::iterator_range<path_const_iterator> path() const {
3441 return llvm::make_range(path_begin(), path_end());
3442 }
3443
getTargetUnionField()3444 const FieldDecl *getTargetUnionField() const {
3445 assert(getCastKind() == CK_ToUnion);
3446 return getTargetFieldForToUnionCast(getType(), getSubExpr()->getType());
3447 }
3448
3449 static const FieldDecl *getTargetFieldForToUnionCast(QualType unionType,
3450 QualType opType);
3451 static const FieldDecl *getTargetFieldForToUnionCast(const RecordDecl *RD,
3452 QualType opType);
3453
classof(const Stmt * T)3454 static bool classof(const Stmt *T) {
3455 return T->getStmtClass() >= firstCastExprConstant &&
3456 T->getStmtClass() <= lastCastExprConstant;
3457 }
3458
3459 // Iterators
children()3460 child_range children() { return child_range(&Op, &Op+1); }
children()3461 const_child_range children() const { return const_child_range(&Op, &Op + 1); }
3462 };
3463
3464 /// ImplicitCastExpr - Allows us to explicitly represent implicit type
3465 /// conversions, which have no direct representation in the original
3466 /// source code. For example: converting T[]->T*, void f()->void
3467 /// (*f)(), float->double, short->int, etc.
3468 ///
3469 /// In C, implicit casts always produce rvalues. However, in C++, an
3470 /// implicit cast whose result is being bound to a reference will be
3471 /// an lvalue or xvalue. For example:
3472 ///
3473 /// @code
3474 /// class Base { };
3475 /// class Derived : public Base { };
3476 /// Derived &&ref();
3477 /// void f(Derived d) {
3478 /// Base& b = d; // initializer is an ImplicitCastExpr
3479 /// // to an lvalue of type Base
3480 /// Base&& r = ref(); // initializer is an ImplicitCastExpr
3481 /// // to an xvalue of type Base
3482 /// }
3483 /// @endcode
3484 class ImplicitCastExpr final
3485 : public CastExpr,
3486 private llvm::TrailingObjects<ImplicitCastExpr, CXXBaseSpecifier *> {
3487
ImplicitCastExpr(QualType ty,CastKind kind,Expr * op,unsigned BasePathLength,ExprValueKind VK)3488 ImplicitCastExpr(QualType ty, CastKind kind, Expr *op,
3489 unsigned BasePathLength, ExprValueKind VK)
3490 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, BasePathLength) { }
3491
3492 /// Construct an empty implicit cast.
ImplicitCastExpr(EmptyShell Shell,unsigned PathSize)3493 explicit ImplicitCastExpr(EmptyShell Shell, unsigned PathSize)
3494 : CastExpr(ImplicitCastExprClass, Shell, PathSize) { }
3495
3496 public:
3497 enum OnStack_t { OnStack };
ImplicitCastExpr(OnStack_t _,QualType ty,CastKind kind,Expr * op,ExprValueKind VK)3498 ImplicitCastExpr(OnStack_t _, QualType ty, CastKind kind, Expr *op,
3499 ExprValueKind VK)
3500 : CastExpr(ImplicitCastExprClass, ty, VK, kind, op, 0) {
3501 }
3502
isPartOfExplicitCast()3503 bool isPartOfExplicitCast() const { return CastExprBits.PartOfExplicitCast; }
setIsPartOfExplicitCast(bool PartOfExplicitCast)3504 void setIsPartOfExplicitCast(bool PartOfExplicitCast) {
3505 CastExprBits.PartOfExplicitCast = PartOfExplicitCast;
3506 }
3507
3508 static ImplicitCastExpr *Create(const ASTContext &Context, QualType T,
3509 CastKind Kind, Expr *Operand,
3510 const CXXCastPath *BasePath,
3511 ExprValueKind Cat);
3512
3513 static ImplicitCastExpr *CreateEmpty(const ASTContext &Context,
3514 unsigned PathSize);
3515
getBeginLoc()3516 SourceLocation getBeginLoc() const LLVM_READONLY {
3517 return getSubExpr()->getBeginLoc();
3518 }
getEndLoc()3519 SourceLocation getEndLoc() const LLVM_READONLY {
3520 return getSubExpr()->getEndLoc();
3521 }
3522
classof(const Stmt * T)3523 static bool classof(const Stmt *T) {
3524 return T->getStmtClass() == ImplicitCastExprClass;
3525 }
3526
3527 friend TrailingObjects;
3528 friend class CastExpr;
3529 };
3530
3531 /// ExplicitCastExpr - An explicit cast written in the source
3532 /// code.
3533 ///
3534 /// This class is effectively an abstract class, because it provides
3535 /// the basic representation of an explicitly-written cast without
3536 /// specifying which kind of cast (C cast, functional cast, static
3537 /// cast, etc.) was written; specific derived classes represent the
3538 /// particular style of cast and its location information.
3539 ///
3540 /// Unlike implicit casts, explicit cast nodes have two different
3541 /// types: the type that was written into the source code, and the
3542 /// actual type of the expression as determined by semantic
3543 /// analysis. These types may differ slightly. For example, in C++ one
3544 /// can cast to a reference type, which indicates that the resulting
3545 /// expression will be an lvalue or xvalue. The reference type, however,
3546 /// will not be used as the type of the expression.
3547 class ExplicitCastExpr : public CastExpr {
3548 /// TInfo - Source type info for the (written) type
3549 /// this expression is casting to.
3550 TypeSourceInfo *TInfo;
3551
3552 protected:
ExplicitCastExpr(StmtClass SC,QualType exprTy,ExprValueKind VK,CastKind kind,Expr * op,unsigned PathSize,TypeSourceInfo * writtenTy)3553 ExplicitCastExpr(StmtClass SC, QualType exprTy, ExprValueKind VK,
3554 CastKind kind, Expr *op, unsigned PathSize,
3555 TypeSourceInfo *writtenTy)
3556 : CastExpr(SC, exprTy, VK, kind, op, PathSize), TInfo(writtenTy) {}
3557
3558 /// Construct an empty explicit cast.
ExplicitCastExpr(StmtClass SC,EmptyShell Shell,unsigned PathSize)3559 ExplicitCastExpr(StmtClass SC, EmptyShell Shell, unsigned PathSize)
3560 : CastExpr(SC, Shell, PathSize) { }
3561
3562 public:
3563 /// getTypeInfoAsWritten - Returns the type source info for the type
3564 /// that this expression is casting to.
getTypeInfoAsWritten()3565 TypeSourceInfo *getTypeInfoAsWritten() const { return TInfo; }
setTypeInfoAsWritten(TypeSourceInfo * writtenTy)3566 void setTypeInfoAsWritten(TypeSourceInfo *writtenTy) { TInfo = writtenTy; }
3567
3568 /// getTypeAsWritten - Returns the type that this expression is
3569 /// casting to, as written in the source code.
getTypeAsWritten()3570 QualType getTypeAsWritten() const { return TInfo->getType(); }
3571
classof(const Stmt * T)3572 static bool classof(const Stmt *T) {
3573 return T->getStmtClass() >= firstExplicitCastExprConstant &&
3574 T->getStmtClass() <= lastExplicitCastExprConstant;
3575 }
3576 };
3577
3578 /// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style
3579 /// cast in C++ (C++ [expr.cast]), which uses the syntax
3580 /// (Type)expr. For example: @c (int)f.
3581 class CStyleCastExpr final
3582 : public ExplicitCastExpr,
3583 private llvm::TrailingObjects<CStyleCastExpr, CXXBaseSpecifier *> {
3584 SourceLocation LPLoc; // the location of the left paren
3585 SourceLocation RPLoc; // the location of the right paren
3586
CStyleCastExpr(QualType exprTy,ExprValueKind vk,CastKind kind,Expr * op,unsigned PathSize,TypeSourceInfo * writtenTy,SourceLocation l,SourceLocation r)3587 CStyleCastExpr(QualType exprTy, ExprValueKind vk, CastKind kind, Expr *op,
3588 unsigned PathSize, TypeSourceInfo *writtenTy,
3589 SourceLocation l, SourceLocation r)
3590 : ExplicitCastExpr(CStyleCastExprClass, exprTy, vk, kind, op, PathSize,
3591 writtenTy), LPLoc(l), RPLoc(r) {}
3592
3593 /// Construct an empty C-style explicit cast.
CStyleCastExpr(EmptyShell Shell,unsigned PathSize)3594 explicit CStyleCastExpr(EmptyShell Shell, unsigned PathSize)
3595 : ExplicitCastExpr(CStyleCastExprClass, Shell, PathSize) { }
3596
3597 public:
3598 static CStyleCastExpr *Create(const ASTContext &Context, QualType T,
3599 ExprValueKind VK, CastKind K,
3600 Expr *Op, const CXXCastPath *BasePath,
3601 TypeSourceInfo *WrittenTy, SourceLocation L,
3602 SourceLocation R);
3603
3604 static CStyleCastExpr *CreateEmpty(const ASTContext &Context,
3605 unsigned PathSize);
3606
getLParenLoc()3607 SourceLocation getLParenLoc() const { return LPLoc; }
setLParenLoc(SourceLocation L)3608 void setLParenLoc(SourceLocation L) { LPLoc = L; }
3609
getRParenLoc()3610 SourceLocation getRParenLoc() const { return RPLoc; }
setRParenLoc(SourceLocation L)3611 void setRParenLoc(SourceLocation L) { RPLoc = L; }
3612
getBeginLoc()3613 SourceLocation getBeginLoc() const LLVM_READONLY { return LPLoc; }
getEndLoc()3614 SourceLocation getEndLoc() const LLVM_READONLY {
3615 return getSubExpr()->getEndLoc();
3616 }
3617
classof(const Stmt * T)3618 static bool classof(const Stmt *T) {
3619 return T->getStmtClass() == CStyleCastExprClass;
3620 }
3621
3622 friend TrailingObjects;
3623 friend class CastExpr;
3624 };
3625
3626 /// A builtin binary operation expression such as "x + y" or "x <= y".
3627 ///
3628 /// This expression node kind describes a builtin binary operation,
3629 /// such as "x + y" for integer values "x" and "y". The operands will
3630 /// already have been converted to appropriate types (e.g., by
3631 /// performing promotions or conversions).
3632 ///
3633 /// In C++, where operators may be overloaded, a different kind of
3634 /// expression node (CXXOperatorCallExpr) is used to express the
3635 /// invocation of an overloaded operator with operator syntax. Within
3636 /// a C++ template, whether BinaryOperator or CXXOperatorCallExpr is
3637 /// used to store an expression "x + y" depends on the subexpressions
3638 /// for x and y. If neither x or y is type-dependent, and the "+"
3639 /// operator resolves to a built-in operation, BinaryOperator will be
3640 /// used to express the computation (x and y may still be
3641 /// value-dependent). If either x or y is type-dependent, or if the
3642 /// "+" resolves to an overloaded operator, CXXOperatorCallExpr will
3643 /// be used to express the computation.
3644 class BinaryOperator : public Expr {
3645 enum { LHS, RHS, END_EXPR };
3646 Stmt *SubExprs[END_EXPR];
3647
3648 public:
3649 typedef BinaryOperatorKind Opcode;
3650
3651 protected:
3652 size_t offsetOfTrailingStorage() const;
3653
3654 /// Return a pointer to the trailing FPOptions
getTrailingFPFeatures()3655 FPOptionsOverride *getTrailingFPFeatures() {
3656 assert(BinaryOperatorBits.HasFPFeatures);
3657 return reinterpret_cast<FPOptionsOverride *>(
3658 reinterpret_cast<char *>(this) + offsetOfTrailingStorage());
3659 }
getTrailingFPFeatures()3660 const FPOptionsOverride *getTrailingFPFeatures() const {
3661 assert(BinaryOperatorBits.HasFPFeatures);
3662 return reinterpret_cast<const FPOptionsOverride *>(
3663 reinterpret_cast<const char *>(this) + offsetOfTrailingStorage());
3664 }
3665
3666 /// Build a binary operator, assuming that appropriate storage has been
3667 /// allocated for the trailing objects when needed.
3668 BinaryOperator(const ASTContext &Ctx, Expr *lhs, Expr *rhs, Opcode opc,
3669 QualType ResTy, ExprValueKind VK, ExprObjectKind OK,
3670 SourceLocation opLoc, FPOptionsOverride FPFeatures);
3671
3672 /// Construct an empty binary operator.
BinaryOperator(EmptyShell Empty)3673 explicit BinaryOperator(EmptyShell Empty) : Expr(BinaryOperatorClass, Empty) {
3674 BinaryOperatorBits.Opc = BO_Comma;
3675 }
3676
3677 public:
3678 static BinaryOperator *CreateEmpty(const ASTContext &C, bool hasFPFeatures);
3679
3680 static BinaryOperator *Create(const ASTContext &C, Expr *lhs, Expr *rhs,
3681 Opcode opc, QualType ResTy, ExprValueKind VK,
3682 ExprObjectKind OK, SourceLocation opLoc,
3683 FPOptionsOverride FPFeatures);
getExprLoc()3684 SourceLocation getExprLoc() const { return getOperatorLoc(); }
getOperatorLoc()3685 SourceLocation getOperatorLoc() const { return BinaryOperatorBits.OpLoc; }
setOperatorLoc(SourceLocation L)3686 void setOperatorLoc(SourceLocation L) { BinaryOperatorBits.OpLoc = L; }
3687
getOpcode()3688 Opcode getOpcode() const {
3689 return static_cast<Opcode>(BinaryOperatorBits.Opc);
3690 }
setOpcode(Opcode Opc)3691 void setOpcode(Opcode Opc) { BinaryOperatorBits.Opc = Opc; }
3692
getLHS()3693 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); }
setLHS(Expr * E)3694 void setLHS(Expr *E) { SubExprs[LHS] = E; }
getRHS()3695 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); }
setRHS(Expr * E)3696 void setRHS(Expr *E) { SubExprs[RHS] = E; }
3697
getBeginLoc()3698 SourceLocation getBeginLoc() const LLVM_READONLY {
3699 return getLHS()->getBeginLoc();
3700 }
getEndLoc()3701 SourceLocation getEndLoc() const LLVM_READONLY {
3702 return getRHS()->getEndLoc();
3703 }
3704
3705 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it
3706 /// corresponds to, e.g. "<<=".
3707 static StringRef getOpcodeStr(Opcode Op);
3708
getOpcodeStr()3709 StringRef getOpcodeStr() const { return getOpcodeStr(getOpcode()); }
3710
3711 /// Retrieve the binary opcode that corresponds to the given
3712 /// overloaded operator.
3713 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO);
3714
3715 /// Retrieve the overloaded operator kind that corresponds to
3716 /// the given binary opcode.
3717 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc);
3718
3719 /// predicates to categorize the respective opcodes.
isPtrMemOp(Opcode Opc)3720 static bool isPtrMemOp(Opcode Opc) {
3721 return Opc == BO_PtrMemD || Opc == BO_PtrMemI;
3722 }
isPtrMemOp()3723 bool isPtrMemOp() const { return isPtrMemOp(getOpcode()); }
3724
isMultiplicativeOp(Opcode Opc)3725 static bool isMultiplicativeOp(Opcode Opc) {
3726 return Opc >= BO_Mul && Opc <= BO_Rem;
3727 }
isMultiplicativeOp()3728 bool isMultiplicativeOp() const { return isMultiplicativeOp(getOpcode()); }
isAdditiveOp(Opcode Opc)3729 static bool isAdditiveOp(Opcode Opc) { return Opc == BO_Add || Opc==BO_Sub; }
isAdditiveOp()3730 bool isAdditiveOp() const { return isAdditiveOp(getOpcode()); }
isShiftOp(Opcode Opc)3731 static bool isShiftOp(Opcode Opc) { return Opc == BO_Shl || Opc == BO_Shr; }
isShiftOp()3732 bool isShiftOp() const { return isShiftOp(getOpcode()); }
3733
isBitwiseOp(Opcode Opc)3734 static bool isBitwiseOp(Opcode Opc) { return Opc >= BO_And && Opc <= BO_Or; }
isBitwiseOp()3735 bool isBitwiseOp() const { return isBitwiseOp(getOpcode()); }
3736
isRelationalOp(Opcode Opc)3737 static bool isRelationalOp(Opcode Opc) { return Opc >= BO_LT && Opc<=BO_GE; }
isRelationalOp()3738 bool isRelationalOp() const { return isRelationalOp(getOpcode()); }
3739
isEqualityOp(Opcode Opc)3740 static bool isEqualityOp(Opcode Opc) { return Opc == BO_EQ || Opc == BO_NE; }
isEqualityOp()3741 bool isEqualityOp() const { return isEqualityOp(getOpcode()); }
3742
isComparisonOp(Opcode Opc)3743 static bool isComparisonOp(Opcode Opc) { return Opc >= BO_Cmp && Opc<=BO_NE; }
isComparisonOp()3744 bool isComparisonOp() const { return isComparisonOp(getOpcode()); }
3745
isCommaOp(Opcode Opc)3746 static bool isCommaOp(Opcode Opc) { return Opc == BO_Comma; }
isCommaOp()3747 bool isCommaOp() const { return isCommaOp(getOpcode()); }
3748
negateComparisonOp(Opcode Opc)3749 static Opcode negateComparisonOp(Opcode Opc) {
3750 switch (Opc) {
3751 default:
3752 llvm_unreachable("Not a comparison operator.");
3753 case BO_LT: return BO_GE;
3754 case BO_GT: return BO_LE;
3755 case BO_LE: return BO_GT;
3756 case BO_GE: return BO_LT;
3757 case BO_EQ: return BO_NE;
3758 case BO_NE: return BO_EQ;
3759 }
3760 }
3761
reverseComparisonOp(Opcode Opc)3762 static Opcode reverseComparisonOp(Opcode Opc) {
3763 switch (Opc) {
3764 default:
3765 llvm_unreachable("Not a comparison operator.");
3766 case BO_LT: return BO_GT;
3767 case BO_GT: return BO_LT;
3768 case BO_LE: return BO_GE;
3769 case BO_GE: return BO_LE;
3770 case BO_EQ:
3771 case BO_NE:
3772 return Opc;
3773 }
3774 }
3775
isLogicalOp(Opcode Opc)3776 static bool isLogicalOp(Opcode Opc) { return Opc == BO_LAnd || Opc==BO_LOr; }
isLogicalOp()3777 bool isLogicalOp() const { return isLogicalOp(getOpcode()); }
3778
isAssignmentOp(Opcode Opc)3779 static bool isAssignmentOp(Opcode Opc) {
3780 return Opc >= BO_Assign && Opc <= BO_OrAssign;
3781 }
isAssignmentOp()3782 bool isAssignmentOp() const { return isAssignmentOp(getOpcode()); }
3783
isCompoundAssignmentOp(Opcode Opc)3784 static bool isCompoundAssignmentOp(Opcode Opc) {
3785 return Opc > BO_Assign && Opc <= BO_OrAssign;
3786 }
isCompoundAssignmentOp()3787 bool isCompoundAssignmentOp() const {
3788 return isCompoundAssignmentOp(getOpcode());
3789 }
getOpForCompoundAssignment(Opcode Opc)3790 static Opcode getOpForCompoundAssignment(Opcode Opc) {
3791 assert(isCompoundAssignmentOp(Opc));
3792 if (Opc >= BO_AndAssign)
3793 return Opcode(unsigned(Opc) - BO_AndAssign + BO_And);
3794 else
3795 return Opcode(unsigned(Opc) - BO_MulAssign + BO_Mul);
3796 }
3797
isShiftAssignOp(Opcode Opc)3798 static bool isShiftAssignOp(Opcode Opc) {
3799 return Opc == BO_ShlAssign || Opc == BO_ShrAssign;
3800 }
isShiftAssignOp()3801 bool isShiftAssignOp() const {
3802 return isShiftAssignOp(getOpcode());
3803 }
3804
3805 // Return true if a binary operator using the specified opcode and operands
3806 // would match the 'p = (i8*)nullptr + n' idiom for casting a pointer-sized
3807 // integer to a pointer.
3808 static bool isNullPointerArithmeticExtension(ASTContext &Ctx, Opcode Opc,
3809 Expr *LHS, Expr *RHS);
3810
classof(const Stmt * S)3811 static bool classof(const Stmt *S) {
3812 return S->getStmtClass() >= firstBinaryOperatorConstant &&
3813 S->getStmtClass() <= lastBinaryOperatorConstant;
3814 }
3815
3816 // Iterators
children()3817 child_range children() {
3818 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR);
3819 }
children()3820 const_child_range children() const {
3821 return const_child_range(&SubExprs[0], &SubExprs[0] + END_EXPR);
3822 }
3823
3824 /// Set and fetch the bit that shows whether FPFeatures needs to be
3825 /// allocated in Trailing Storage
setHasStoredFPFeatures(bool B)3826 void setHasStoredFPFeatures(bool B) { BinaryOperatorBits.HasFPFeatures = B; }
hasStoredFPFeatures()3827 bool hasStoredFPFeatures() const { return BinaryOperatorBits.HasFPFeatures; }
3828
3829 /// Get FPFeatures from trailing storage
getStoredFPFeatures()3830 FPOptionsOverride getStoredFPFeatures() const {
3831 assert(hasStoredFPFeatures());
3832 return *getTrailingFPFeatures();
3833 }
3834 /// Set FPFeatures in trailing storage, used only by Serialization
setStoredFPFeatures(FPOptionsOverride F)3835 void setStoredFPFeatures(FPOptionsOverride F) {
3836 assert(BinaryOperatorBits.HasFPFeatures);
3837 *getTrailingFPFeatures() = F;
3838 }
3839
3840 // Get the FP features status of this operator. Only meaningful for
3841 // operations on floating point types.
getFPFeaturesInEffect(const LangOptions & LO)3842 FPOptions getFPFeaturesInEffect(const LangOptions &LO) const {
3843 if (BinaryOperatorBits.HasFPFeatures)
3844 return getStoredFPFeatures().applyOverrides(LO);
3845 return FPOptions::defaultWithoutTrailingStorage(LO);
3846 }
3847
3848 // This is used in ASTImporter
getFPFeatures(const LangOptions & LO)3849 FPOptionsOverride getFPFeatures(const LangOptions &LO) const {
3850 if (BinaryOperatorBits.HasFPFeatures)
3851 return getStoredFPFeatures();
3852 return FPOptionsOverride();
3853 }
3854
3855 // Get the FP contractability status of this operator. Only meaningful for
3856 // operations on floating point types.
isFPContractableWithinStatement(const LangOptions & LO)3857 bool isFPContractableWithinStatement(const LangOptions &LO) const {
3858 return getFPFeaturesInEffect(LO).allowFPContractWithinStatement();
3859 }
3860
3861 // Get the FENV_ACCESS status of this operator. Only meaningful for
3862 // operations on floating point types.
isFEnvAccessOn(const LangOptions & LO)3863 bool isFEnvAccessOn(const LangOptions &LO) const {
3864 return getFPFeaturesInEffect(LO).getAllowFEnvAccess();
3865 }
3866
3867 protected:
3868 BinaryOperator(const ASTContext &Ctx, Expr *lhs, Expr *rhs, Opcode opc,
3869 QualType ResTy, ExprValueKind VK, ExprObjectKind OK,
3870 SourceLocation opLoc, FPOptionsOverride FPFeatures,
3871 bool dead2);
3872
3873 /// Construct an empty BinaryOperator, SC is CompoundAssignOperator.
BinaryOperator(StmtClass SC,EmptyShell Empty)3874 BinaryOperator(StmtClass SC, EmptyShell Empty) : Expr(SC, Empty) {
3875 BinaryOperatorBits.Opc = BO_MulAssign;
3876 }
3877
3878 /// Return the size in bytes needed for the trailing objects.
3879 /// Used to allocate the right amount of storage.
sizeOfTrailingObjects(bool HasFPFeatures)3880 static unsigned sizeOfTrailingObjects(bool HasFPFeatures) {
3881 return HasFPFeatures * sizeof(FPOptionsOverride);
3882 }
3883 };
3884
3885 /// CompoundAssignOperator - For compound assignments (e.g. +=), we keep
3886 /// track of the type the operation is performed in. Due to the semantics of
3887 /// these operators, the operands are promoted, the arithmetic performed, an
3888 /// implicit conversion back to the result type done, then the assignment takes
3889 /// place. This captures the intermediate type which the computation is done
3890 /// in.
3891 class CompoundAssignOperator : public BinaryOperator {
3892 QualType ComputationLHSType;
3893 QualType ComputationResultType;
3894
3895 /// Construct an empty CompoundAssignOperator.
CompoundAssignOperator(const ASTContext & C,EmptyShell Empty,bool hasFPFeatures)3896 explicit CompoundAssignOperator(const ASTContext &C, EmptyShell Empty,
3897 bool hasFPFeatures)
3898 : BinaryOperator(CompoundAssignOperatorClass, Empty) {}
3899
3900 protected:
CompoundAssignOperator(const ASTContext & C,Expr * lhs,Expr * rhs,Opcode opc,QualType ResType,ExprValueKind VK,ExprObjectKind OK,SourceLocation OpLoc,FPOptionsOverride FPFeatures,QualType CompLHSType,QualType CompResultType)3901 CompoundAssignOperator(const ASTContext &C, Expr *lhs, Expr *rhs, Opcode opc,
3902 QualType ResType, ExprValueKind VK, ExprObjectKind OK,
3903 SourceLocation OpLoc, FPOptionsOverride FPFeatures,
3904 QualType CompLHSType, QualType CompResultType)
3905 : BinaryOperator(C, lhs, rhs, opc, ResType, VK, OK, OpLoc, FPFeatures,
3906 true),
3907 ComputationLHSType(CompLHSType), ComputationResultType(CompResultType) {
3908 assert(isCompoundAssignmentOp() &&
3909 "Only should be used for compound assignments");
3910 }
3911
3912 public:
3913 static CompoundAssignOperator *CreateEmpty(const ASTContext &C,
3914 bool hasFPFeatures);
3915
3916 static CompoundAssignOperator *
3917 Create(const ASTContext &C, Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy,
3918 ExprValueKind VK, ExprObjectKind OK, SourceLocation opLoc,
3919 FPOptionsOverride FPFeatures, QualType CompLHSType = QualType(),
3920 QualType CompResultType = QualType());
3921
3922 // The two computation types are the type the LHS is converted
3923 // to for the computation and the type of the result; the two are
3924 // distinct in a few cases (specifically, int+=ptr and ptr-=ptr).
getComputationLHSType()3925 QualType getComputationLHSType() const { return ComputationLHSType; }
setComputationLHSType(QualType T)3926 void setComputationLHSType(QualType T) { ComputationLHSType = T; }
3927
getComputationResultType()3928 QualType getComputationResultType() const { return ComputationResultType; }
setComputationResultType(QualType T)3929 void setComputationResultType(QualType T) { ComputationResultType = T; }
3930
classof(const Stmt * S)3931 static bool classof(const Stmt *S) {
3932 return S->getStmtClass() == CompoundAssignOperatorClass;
3933 }
3934 };
3935
offsetOfTrailingStorage()3936 inline size_t BinaryOperator::offsetOfTrailingStorage() const {
3937 assert(BinaryOperatorBits.HasFPFeatures);
3938 return isa<CompoundAssignOperator>(this) ? sizeof(CompoundAssignOperator)
3939 : sizeof(BinaryOperator);
3940 }
3941
3942 /// AbstractConditionalOperator - An abstract base class for
3943 /// ConditionalOperator and BinaryConditionalOperator.
3944 class AbstractConditionalOperator : public Expr {
3945 SourceLocation QuestionLoc, ColonLoc;
3946 friend class ASTStmtReader;
3947
3948 protected:
AbstractConditionalOperator(StmtClass SC,QualType T,ExprValueKind VK,ExprObjectKind OK,SourceLocation qloc,SourceLocation cloc)3949 AbstractConditionalOperator(StmtClass SC, QualType T, ExprValueKind VK,
3950 ExprObjectKind OK, SourceLocation qloc,
3951 SourceLocation cloc)
3952 : Expr(SC, T, VK, OK), QuestionLoc(qloc), ColonLoc(cloc) {}
3953
AbstractConditionalOperator(StmtClass SC,EmptyShell Empty)3954 AbstractConditionalOperator(StmtClass SC, EmptyShell Empty)
3955 : Expr(SC, Empty) { }
3956
3957 public:
3958 // getCond - Return the expression representing the condition for
3959 // the ?: operator.
3960 Expr *getCond() const;
3961
3962 // getTrueExpr - Return the subexpression representing the value of
3963 // the expression if the condition evaluates to true.
3964 Expr *getTrueExpr() const;
3965
3966 // getFalseExpr - Return the subexpression representing the value of
3967 // the expression if the condition evaluates to false. This is
3968 // the same as getRHS.
3969 Expr *getFalseExpr() const;
3970
getQuestionLoc()3971 SourceLocation getQuestionLoc() const { return QuestionLoc; }
getColonLoc()3972 SourceLocation getColonLoc() const { return ColonLoc; }
3973
classof(const Stmt * T)3974 static bool classof(const Stmt *T) {
3975 return T->getStmtClass() == ConditionalOperatorClass ||
3976 T->getStmtClass() == BinaryConditionalOperatorClass;
3977 }
3978 };
3979
3980 /// ConditionalOperator - The ?: ternary operator. The GNU "missing
3981 /// middle" extension is a BinaryConditionalOperator.
3982 class ConditionalOperator : public AbstractConditionalOperator {
3983 enum { COND, LHS, RHS, END_EXPR };
3984 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides.
3985
3986 friend class ASTStmtReader;
3987 public:
ConditionalOperator(Expr * cond,SourceLocation QLoc,Expr * lhs,SourceLocation CLoc,Expr * rhs,QualType t,ExprValueKind VK,ExprObjectKind OK)3988 ConditionalOperator(Expr *cond, SourceLocation QLoc, Expr *lhs,
3989 SourceLocation CLoc, Expr *rhs, QualType t,
3990 ExprValueKind VK, ExprObjectKind OK)
3991 : AbstractConditionalOperator(ConditionalOperatorClass, t, VK, OK, QLoc,
3992 CLoc) {
3993 SubExprs[COND] = cond;
3994 SubExprs[LHS] = lhs;
3995 SubExprs[RHS] = rhs;
3996 setDependence(computeDependence(this));
3997 }
3998
3999 /// Build an empty conditional operator.
ConditionalOperator(EmptyShell Empty)4000 explicit ConditionalOperator(EmptyShell Empty)
4001 : AbstractConditionalOperator(ConditionalOperatorClass, Empty) { }
4002
4003 // getCond - Return the expression representing the condition for
4004 // the ?: operator.
getCond()4005 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); }
4006
4007 // getTrueExpr - Return the subexpression representing the value of
4008 // the expression if the condition evaluates to true.
getTrueExpr()4009 Expr *getTrueExpr() const { return cast<Expr>(SubExprs[LHS]); }
4010
4011 // getFalseExpr - Return the subexpression representing the value of
4012 // the expression if the condition evaluates to false. This is
4013 // the same as getRHS.
getFalseExpr()4014 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); }
4015
getLHS()4016 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); }
getRHS()4017 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); }
4018
getBeginLoc()4019 SourceLocation getBeginLoc() const LLVM_READONLY {
4020 return getCond()->getBeginLoc();
4021 }
getEndLoc()4022 SourceLocation getEndLoc() const LLVM_READONLY {
4023 return getRHS()->getEndLoc();
4024 }
4025
classof(const Stmt * T)4026 static bool classof(const Stmt *T) {
4027 return T->getStmtClass() == ConditionalOperatorClass;
4028 }
4029
4030 // Iterators
children()4031 child_range children() {
4032 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR);
4033 }
children()4034 const_child_range children() const {
4035 return const_child_range(&SubExprs[0], &SubExprs[0] + END_EXPR);
4036 }
4037 };
4038
4039 /// BinaryConditionalOperator - The GNU extension to the conditional
4040 /// operator which allows the middle operand to be omitted.
4041 ///
4042 /// This is a different expression kind on the assumption that almost
4043 /// every client ends up needing to know that these are different.
4044 class BinaryConditionalOperator : public AbstractConditionalOperator {
4045 enum { COMMON, COND, LHS, RHS, NUM_SUBEXPRS };
4046
4047 /// - the common condition/left-hand-side expression, which will be
4048 /// evaluated as the opaque value
4049 /// - the condition, expressed in terms of the opaque value
4050 /// - the left-hand-side, expressed in terms of the opaque value
4051 /// - the right-hand-side
4052 Stmt *SubExprs[NUM_SUBEXPRS];
4053 OpaqueValueExpr *OpaqueValue;
4054
4055 friend class ASTStmtReader;
4056 public:
BinaryConditionalOperator(Expr * common,OpaqueValueExpr * opaqueValue,Expr * cond,Expr * lhs,Expr * rhs,SourceLocation qloc,SourceLocation cloc,QualType t,ExprValueKind VK,ExprObjectKind OK)4057 BinaryConditionalOperator(Expr *common, OpaqueValueExpr *opaqueValue,
4058 Expr *cond, Expr *lhs, Expr *rhs,
4059 SourceLocation qloc, SourceLocation cloc,
4060 QualType t, ExprValueKind VK, ExprObjectKind OK)
4061 : AbstractConditionalOperator(BinaryConditionalOperatorClass, t, VK, OK,
4062 qloc, cloc),
4063 OpaqueValue(opaqueValue) {
4064 SubExprs[COMMON] = common;
4065 SubExprs[COND] = cond;
4066 SubExprs[LHS] = lhs;
4067 SubExprs[RHS] = rhs;
4068 assert(OpaqueValue->getSourceExpr() == common && "Wrong opaque value");
4069 setDependence(computeDependence(this));
4070 }
4071
4072 /// Build an empty conditional operator.
BinaryConditionalOperator(EmptyShell Empty)4073 explicit BinaryConditionalOperator(EmptyShell Empty)
4074 : AbstractConditionalOperator(BinaryConditionalOperatorClass, Empty) { }
4075
4076 /// getCommon - Return the common expression, written to the
4077 /// left of the condition. The opaque value will be bound to the
4078 /// result of this expression.
getCommon()4079 Expr *getCommon() const { return cast<Expr>(SubExprs[COMMON]); }
4080
4081 /// getOpaqueValue - Return the opaque value placeholder.
getOpaqueValue()4082 OpaqueValueExpr *getOpaqueValue() const { return OpaqueValue; }
4083
4084 /// getCond - Return the condition expression; this is defined
4085 /// in terms of the opaque value.
getCond()4086 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); }
4087
4088 /// getTrueExpr - Return the subexpression which will be
4089 /// evaluated if the condition evaluates to true; this is defined
4090 /// in terms of the opaque value.
getTrueExpr()4091 Expr *getTrueExpr() const {
4092 return cast<Expr>(SubExprs[LHS]);
4093 }
4094
4095 /// getFalseExpr - Return the subexpression which will be
4096 /// evaluated if the condnition evaluates to false; this is
4097 /// defined in terms of the opaque value.
getFalseExpr()4098 Expr *getFalseExpr() const {
4099 return cast<Expr>(SubExprs[RHS]);
4100 }
4101
getBeginLoc()4102 SourceLocation getBeginLoc() const LLVM_READONLY {
4103 return getCommon()->getBeginLoc();
4104 }
getEndLoc()4105 SourceLocation getEndLoc() const LLVM_READONLY {
4106 return getFalseExpr()->getEndLoc();
4107 }
4108
classof(const Stmt * T)4109 static bool classof(const Stmt *T) {
4110 return T->getStmtClass() == BinaryConditionalOperatorClass;
4111 }
4112
4113 // Iterators
children()4114 child_range children() {
4115 return child_range(SubExprs, SubExprs + NUM_SUBEXPRS);
4116 }
children()4117 const_child_range children() const {
4118 return const_child_range(SubExprs, SubExprs + NUM_SUBEXPRS);
4119 }
4120 };
4121
getCond()4122 inline Expr *AbstractConditionalOperator::getCond() const {
4123 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this))
4124 return co->getCond();
4125 return cast<BinaryConditionalOperator>(this)->getCond();
4126 }
4127
getTrueExpr()4128 inline Expr *AbstractConditionalOperator::getTrueExpr() const {
4129 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this))
4130 return co->getTrueExpr();
4131 return cast<BinaryConditionalOperator>(this)->getTrueExpr();
4132 }
4133
getFalseExpr()4134 inline Expr *AbstractConditionalOperator::getFalseExpr() const {
4135 if (const ConditionalOperator *co = dyn_cast<ConditionalOperator>(this))
4136 return co->getFalseExpr();
4137 return cast<BinaryConditionalOperator>(this)->getFalseExpr();
4138 }
4139
4140 /// AddrLabelExpr - The GNU address of label extension, representing &&label.
4141 class AddrLabelExpr : public Expr {
4142 SourceLocation AmpAmpLoc, LabelLoc;
4143 LabelDecl *Label;
4144 public:
AddrLabelExpr(SourceLocation AALoc,SourceLocation LLoc,LabelDecl * L,QualType t)4145 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelDecl *L,
4146 QualType t)
4147 : Expr(AddrLabelExprClass, t, VK_RValue, OK_Ordinary), AmpAmpLoc(AALoc),
4148 LabelLoc(LLoc), Label(L) {
4149 setDependence(ExprDependence::None);
4150 }
4151
4152 /// Build an empty address of a label expression.
AddrLabelExpr(EmptyShell Empty)4153 explicit AddrLabelExpr(EmptyShell Empty)
4154 : Expr(AddrLabelExprClass, Empty) { }
4155
getAmpAmpLoc()4156 SourceLocation getAmpAmpLoc() const { return AmpAmpLoc; }
setAmpAmpLoc(SourceLocation L)4157 void setAmpAmpLoc(SourceLocation L) { AmpAmpLoc = L; }
getLabelLoc()4158 SourceLocation getLabelLoc() const { return LabelLoc; }
setLabelLoc(SourceLocation L)4159 void setLabelLoc(SourceLocation L) { LabelLoc = L; }
4160
getBeginLoc()4161 SourceLocation getBeginLoc() const LLVM_READONLY { return AmpAmpLoc; }
getEndLoc()4162 SourceLocation getEndLoc() const LLVM_READONLY { return LabelLoc; }
4163
getLabel()4164 LabelDecl *getLabel() const { return Label; }
setLabel(LabelDecl * L)4165 void setLabel(LabelDecl *L) { Label = L; }
4166
classof(const Stmt * T)4167 static bool classof(const Stmt *T) {
4168 return T->getStmtClass() == AddrLabelExprClass;
4169 }
4170
4171 // Iterators
children()4172 child_range children() {
4173 return child_range(child_iterator(), child_iterator());
4174 }
children()4175 const_child_range children() const {
4176 return const_child_range(const_child_iterator(), const_child_iterator());
4177 }
4178 };
4179
4180 /// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}).
4181 /// The StmtExpr contains a single CompoundStmt node, which it evaluates and
4182 /// takes the value of the last subexpression.
4183 ///
4184 /// A StmtExpr is always an r-value; values "returned" out of a
4185 /// StmtExpr will be copied.
4186 class StmtExpr : public Expr {
4187 Stmt *SubStmt;
4188 SourceLocation LParenLoc, RParenLoc;
4189 public:
StmtExpr(CompoundStmt * SubStmt,QualType T,SourceLocation LParenLoc,SourceLocation RParenLoc,unsigned TemplateDepth)4190 StmtExpr(CompoundStmt *SubStmt, QualType T, SourceLocation LParenLoc,
4191 SourceLocation RParenLoc, unsigned TemplateDepth)
4192 : Expr(StmtExprClass, T, VK_RValue, OK_Ordinary), SubStmt(SubStmt),
4193 LParenLoc(LParenLoc), RParenLoc(RParenLoc) {
4194 setDependence(computeDependence(this, TemplateDepth));
4195 // FIXME: A templated statement expression should have an associated
4196 // DeclContext so that nested declarations always have a dependent context.
4197 StmtExprBits.TemplateDepth = TemplateDepth;
4198 }
4199
4200 /// Build an empty statement expression.
StmtExpr(EmptyShell Empty)4201 explicit StmtExpr(EmptyShell Empty) : Expr(StmtExprClass, Empty) { }
4202
getSubStmt()4203 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); }
getSubStmt()4204 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); }
setSubStmt(CompoundStmt * S)4205 void setSubStmt(CompoundStmt *S) { SubStmt = S; }
4206
getBeginLoc()4207 SourceLocation getBeginLoc() const LLVM_READONLY { return LParenLoc; }
getEndLoc()4208 SourceLocation getEndLoc() const LLVM_READONLY { return RParenLoc; }
4209
getLParenLoc()4210 SourceLocation getLParenLoc() const { return LParenLoc; }
setLParenLoc(SourceLocation L)4211 void setLParenLoc(SourceLocation L) { LParenLoc = L; }
getRParenLoc()4212 SourceLocation getRParenLoc() const { return RParenLoc; }
setRParenLoc(SourceLocation L)4213 void setRParenLoc(SourceLocation L) { RParenLoc = L; }
4214
getTemplateDepth()4215 unsigned getTemplateDepth() const { return StmtExprBits.TemplateDepth; }
4216
classof(const Stmt * T)4217 static bool classof(const Stmt *T) {
4218 return T->getStmtClass() == StmtExprClass;
4219 }
4220
4221 // Iterators
children()4222 child_range children() { return child_range(&SubStmt, &SubStmt+1); }
children()4223 const_child_range children() const {
4224 return const_child_range(&SubStmt, &SubStmt + 1);
4225 }
4226 };
4227
4228 /// ShuffleVectorExpr - clang-specific builtin-in function
4229 /// __builtin_shufflevector.
4230 /// This AST node represents a operator that does a constant
4231 /// shuffle, similar to LLVM's shufflevector instruction. It takes
4232 /// two vectors and a variable number of constant indices,
4233 /// and returns the appropriately shuffled vector.
4234 class ShuffleVectorExpr : public Expr {
4235 SourceLocation BuiltinLoc, RParenLoc;
4236
4237 // SubExprs - the list of values passed to the __builtin_shufflevector
4238 // function. The first two are vectors, and the rest are constant
4239 // indices. The number of values in this list is always
4240 // 2+the number of indices in the vector type.
4241 Stmt **SubExprs;
4242 unsigned NumExprs;
4243
4244 public:
4245 ShuffleVectorExpr(const ASTContext &C, ArrayRef<Expr*> args, QualType Type,
4246 SourceLocation BLoc, SourceLocation RP);
4247
4248 /// Build an empty vector-shuffle expression.
ShuffleVectorExpr(EmptyShell Empty)4249 explicit ShuffleVectorExpr(EmptyShell Empty)
4250 : Expr(ShuffleVectorExprClass, Empty), SubExprs(nullptr) { }
4251
getBuiltinLoc()4252 SourceLocation getBuiltinLoc() const { return BuiltinLoc; }
setBuiltinLoc(SourceLocation L)4253 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; }
4254
getRParenLoc()4255 SourceLocation getRParenLoc() const { return RParenLoc; }
setRParenLoc(SourceLocation L)4256 void setRParenLoc(SourceLocation L) { RParenLoc = L; }
4257
getBeginLoc()4258 SourceLocation getBeginLoc() const LLVM_READONLY { return BuiltinLoc; }
getEndLoc()4259 SourceLocation getEndLoc() const LLVM_READONLY { return RParenLoc; }
4260
classof(const Stmt * T)4261 static bool classof(const Stmt *T) {
4262 return T->getStmtClass() == ShuffleVectorExprClass;
4263 }
4264
4265 /// getNumSubExprs - Return the size of the SubExprs array. This includes the
4266 /// constant expression, the actual arguments passed in, and the function
4267 /// pointers.
getNumSubExprs()4268 unsigned getNumSubExprs() const { return NumExprs; }
4269
4270 /// Retrieve the array of expressions.
getSubExprs()4271 Expr **getSubExprs() { return reinterpret_cast<Expr **>(SubExprs); }
4272
4273 /// getExpr - Return the Expr at the specified index.
getExpr(unsigned Index)4274 Expr *getExpr(unsigned Index) {
4275 assert((Index < NumExprs) && "Arg access out of range!");
4276 return cast<Expr>(SubExprs[Index]);
4277 }
getExpr(unsigned Index)4278 const Expr *getExpr(unsigned Index) const {
4279 assert((Index < NumExprs) && "Arg access out of range!");
4280 return cast<Expr>(SubExprs[Index]);
4281 }
4282
4283 void setExprs(const ASTContext &C, ArrayRef<Expr *> Exprs);
4284
getShuffleMaskIdx(const ASTContext & Ctx,unsigned N)4285 llvm::APSInt getShuffleMaskIdx(const ASTContext &Ctx, unsigned N) const {
4286 assert((N < NumExprs - 2) && "Shuffle idx out of range!");
4287 return getExpr(N+2)->EvaluateKnownConstInt(Ctx);
4288 }
4289
4290 // Iterators
children()4291 child_range children() {
4292 return child_range(&SubExprs[0], &SubExprs[0]+NumExprs);
4293 }
children()4294 const_child_range children() const {
4295 return const_child_range(&SubExprs[0], &SubExprs[0] + NumExprs);
4296 }
4297 };
4298
4299 /// ConvertVectorExpr - Clang builtin function __builtin_convertvector
4300 /// This AST node provides support for converting a vector type to another
4301 /// vector type of the same arity.
4302 class ConvertVectorExpr : public Expr {
4303 private:
4304 Stmt *SrcExpr;
4305 TypeSourceInfo *TInfo;
4306 SourceLocation BuiltinLoc, RParenLoc;
4307
4308 friend class ASTReader;
4309 friend class ASTStmtReader;
ConvertVectorExpr(EmptyShell Empty)4310 explicit ConvertVectorExpr(EmptyShell Empty) : Expr(ConvertVectorExprClass, Empty) {}
4311
4312 public:
ConvertVectorExpr(Expr * SrcExpr,TypeSourceInfo * TI,QualType DstType,ExprValueKind VK,ExprObjectKind OK,SourceLocation BuiltinLoc,SourceLocation RParenLoc)4313 ConvertVectorExpr(Expr *SrcExpr, TypeSourceInfo *TI, QualType DstType,
4314 ExprValueKind VK, ExprObjectKind OK,
4315 SourceLocation BuiltinLoc, SourceLocation RParenLoc)
4316 : Expr(ConvertVectorExprClass, DstType, VK, OK), SrcExpr(SrcExpr),
4317 TInfo(TI), BuiltinLoc(BuiltinLoc), RParenLoc(RParenLoc) {
4318 setDependence(computeDependence(this));
4319 }
4320
4321 /// getSrcExpr - Return the Expr to be converted.
getSrcExpr()4322 Expr *getSrcExpr() const { return cast<Expr>(SrcExpr); }
4323
4324 /// getTypeSourceInfo - Return the destination type.
getTypeSourceInfo()4325 TypeSourceInfo *getTypeSourceInfo() const {
4326 return TInfo;
4327 }
setTypeSourceInfo(TypeSourceInfo * ti)4328 void setTypeSourceInfo(TypeSourceInfo *ti) {
4329 TInfo = ti;
4330 }
4331
4332 /// getBuiltinLoc - Return the location of the __builtin_convertvector token.
getBuiltinLoc()4333 SourceLocation getBuiltinLoc() const { return BuiltinLoc; }
4334
4335 /// getRParenLoc - Return the location of final right parenthesis.
getRParenLoc()4336 SourceLocation getRParenLoc() const { return RParenLoc; }
4337
getBeginLoc()4338 SourceLocation getBeginLoc() const LLVM_READONLY { return BuiltinLoc; }
getEndLoc()4339 SourceLocation getEndLoc() const LLVM_READONLY { return RParenLoc; }
4340
classof(const Stmt * T)4341 static bool classof(const Stmt *T) {
4342 return T->getStmtClass() == ConvertVectorExprClass;
4343 }
4344
4345 // Iterators
children()4346 child_range children() { return child_range(&SrcExpr, &SrcExpr+1); }
children()4347 const_child_range children() const {
4348 return const_child_range(&SrcExpr, &SrcExpr + 1);
4349 }
4350 };
4351
4352 /// ChooseExpr - GNU builtin-in function __builtin_choose_expr.
4353 /// This AST node is similar to the conditional operator (?:) in C, with
4354 /// the following exceptions:
4355 /// - the test expression must be a integer constant expression.
4356 /// - the expression returned acts like the chosen subexpression in every
4357 /// visible way: the type is the same as that of the chosen subexpression,
4358 /// and all predicates (whether it's an l-value, whether it's an integer
4359 /// constant expression, etc.) return the same result as for the chosen
4360 /// sub-expression.
4361 class ChooseExpr : public Expr {
4362 enum { COND, LHS, RHS, END_EXPR };
4363 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides.
4364 SourceLocation BuiltinLoc, RParenLoc;
4365 bool CondIsTrue;
4366 public:
ChooseExpr(SourceLocation BLoc,Expr * cond,Expr * lhs,Expr * rhs,QualType t,ExprValueKind VK,ExprObjectKind OK,SourceLocation RP,bool condIsTrue)4367 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, QualType t,
4368 ExprValueKind VK, ExprObjectKind OK, SourceLocation RP,
4369 bool condIsTrue)
4370 : Expr(ChooseExprClass, t, VK, OK), BuiltinLoc(BLoc), RParenLoc(RP),
4371 CondIsTrue(condIsTrue) {
4372 SubExprs[COND] = cond;
4373 SubExprs[LHS] = lhs;
4374 SubExprs[RHS] = rhs;
4375
4376 setDependence(computeDependence(this));
4377 }
4378
4379 /// Build an empty __builtin_choose_expr.
ChooseExpr(EmptyShell Empty)4380 explicit ChooseExpr(EmptyShell Empty) : Expr(ChooseExprClass, Empty) { }
4381
4382 /// isConditionTrue - Return whether the condition is true (i.e. not
4383 /// equal to zero).
isConditionTrue()4384 bool isConditionTrue() const {
4385 assert(!isConditionDependent() &&
4386 "Dependent condition isn't true or false");
4387 return CondIsTrue;
4388 }
setIsConditionTrue(bool isTrue)4389 void setIsConditionTrue(bool isTrue) { CondIsTrue = isTrue; }
4390
isConditionDependent()4391 bool isConditionDependent() const {
4392 return getCond()->isTypeDependent() || getCond()->isValueDependent();
4393 }
4394
4395 /// getChosenSubExpr - Return the subexpression chosen according to the
4396 /// condition.
getChosenSubExpr()4397 Expr *getChosenSubExpr() const {
4398 return isConditionTrue() ? getLHS() : getRHS();
4399 }
4400
getCond()4401 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); }
setCond(Expr * E)4402 void setCond(Expr *E) { SubExprs[COND] = E; }
getLHS()4403 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); }
setLHS(Expr * E)4404 void setLHS(Expr *E) { SubExprs[LHS] = E; }
getRHS()4405 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); }
setRHS(Expr * E)4406 void setRHS(Expr *E) { SubExprs[RHS] = E; }
4407
getBuiltinLoc()4408 SourceLocation getBuiltinLoc() const { return BuiltinLoc; }
setBuiltinLoc(SourceLocation L)4409 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; }
4410
getRParenLoc()4411 SourceLocation getRParenLoc() const { return RParenLoc; }
setRParenLoc(SourceLocation L)4412 void setRParenLoc(SourceLocation L) { RParenLoc = L; }
4413
getBeginLoc()4414 SourceLocation getBeginLoc() const LLVM_READONLY { return BuiltinLoc; }
getEndLoc()4415 SourceLocation getEndLoc() const LLVM_READONLY { return RParenLoc; }
4416
classof(const Stmt * T)4417 static bool classof(const Stmt *T) {
4418 return T->getStmtClass() == ChooseExprClass;
4419 }
4420
4421 // Iterators
children()4422 child_range children() {
4423 return child_range(&SubExprs[0], &SubExprs[0]+END_EXPR);
4424 }
children()4425 const_child_range children() const {
4426 return const_child_range(&SubExprs[0], &SubExprs[0] + END_EXPR);
4427 }
4428 };
4429
4430 /// GNUNullExpr - Implements the GNU __null extension, which is a name
4431 /// for a null pointer constant that has integral type (e.g., int or
4432 /// long) and is the same size and alignment as a pointer. The __null
4433 /// extension is typically only used by system headers, which define
4434 /// NULL as __null in C++ rather than using 0 (which is an integer
4435 /// that may not match the size of a pointer).
4436 class GNUNullExpr : public Expr {
4437 /// TokenLoc - The location of the __null keyword.
4438 SourceLocation TokenLoc;
4439
4440 public:
GNUNullExpr(QualType Ty,SourceLocation Loc)4441 GNUNullExpr(QualType Ty, SourceLocation Loc)
4442 : Expr(GNUNullExprClass, Ty, VK_RValue, OK_Ordinary), TokenLoc(Loc) {
4443 setDependence(ExprDependence::None);
4444 }
4445
4446 /// Build an empty GNU __null expression.
GNUNullExpr(EmptyShell Empty)4447 explicit GNUNullExpr(EmptyShell Empty) : Expr(GNUNullExprClass, Empty) { }
4448
4449 /// getTokenLocation - The location of the __null token.
getTokenLocation()4450 SourceLocation getTokenLocation() const { return TokenLoc; }
setTokenLocation(SourceLocation L)4451 void setTokenLocation(SourceLocation L) { TokenLoc = L; }
4452
getBeginLoc()4453 SourceLocation getBeginLoc() const LLVM_READONLY { return TokenLoc; }
getEndLoc()4454 SourceLocation getEndLoc() const LLVM_READONLY { return TokenLoc; }
4455
classof(const Stmt * T)4456 static bool classof(const Stmt *T) {
4457 return T->getStmtClass() == GNUNullExprClass;
4458 }
4459
4460 // Iterators
children()4461 child_range children() {
4462 return child_range(child_iterator(), child_iterator());
4463 }
children()4464 const_child_range children() const {
4465 return const_child_range(const_child_iterator(), const_child_iterator());
4466 }
4467 };
4468
4469 /// Represents a call to the builtin function \c __builtin_va_arg.
4470 class VAArgExpr : public Expr {
4471 Stmt *Val;
4472 llvm::PointerIntPair<TypeSourceInfo *, 1, bool> TInfo;
4473 SourceLocation BuiltinLoc, RParenLoc;
4474 public:
VAArgExpr(SourceLocation BLoc,Expr * e,TypeSourceInfo * TInfo,SourceLocation RPLoc,QualType t,bool IsMS)4475 VAArgExpr(SourceLocation BLoc, Expr *e, TypeSourceInfo *TInfo,
4476 SourceLocation RPLoc, QualType t, bool IsMS)
4477 : Expr(VAArgExprClass, t, VK_RValue, OK_Ordinary), Val(e),
4478 TInfo(TInfo, IsMS), BuiltinLoc(BLoc), RParenLoc(RPLoc) {
4479 setDependence(computeDependence(this));
4480 }
4481
4482 /// Create an empty __builtin_va_arg expression.
VAArgExpr(EmptyShell Empty)4483 explicit VAArgExpr(EmptyShell Empty)
4484 : Expr(VAArgExprClass, Empty), Val(nullptr), TInfo(nullptr, false) {}
4485
getSubExpr()4486 const Expr *getSubExpr() const { return cast<Expr>(Val); }
getSubExpr()4487 Expr *getSubExpr() { return cast<Expr>(Val); }
setSubExpr(Expr * E)4488 void setSubExpr(Expr *E) { Val = E; }
4489
4490 /// Returns whether this is really a Win64 ABI va_arg expression.
isMicrosoftABI()4491 bool isMicrosoftABI() const { return TInfo.getInt(); }
setIsMicrosoftABI(bool IsMS)4492 void setIsMicrosoftABI(bool IsMS) { TInfo.setInt(IsMS); }
4493
getWrittenTypeInfo()4494 TypeSourceInfo *getWrittenTypeInfo() const { return TInfo.getPointer(); }
setWrittenTypeInfo(TypeSourceInfo * TI)4495 void setWrittenTypeInfo(TypeSourceInfo *TI) { TInfo.setPointer(TI); }
4496
getBuiltinLoc()4497 SourceLocation getBuiltinLoc() const { return BuiltinLoc; }
setBuiltinLoc(SourceLocation L)4498 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; }
4499
getRParenLoc()4500 SourceLocation getRParenLoc() const { return RParenLoc; }
setRParenLoc(SourceLocation L)4501 void setRParenLoc(SourceLocation L) { RParenLoc = L; }
4502
getBeginLoc()4503 SourceLocation getBeginLoc() const LLVM_READONLY { return BuiltinLoc; }
getEndLoc()4504 SourceLocation getEndLoc() const LLVM_READONLY { return RParenLoc; }
4505
classof(const Stmt * T)4506 static bool classof(const Stmt *T) {
4507 return T->getStmtClass() == VAArgExprClass;
4508 }
4509
4510 // Iterators
children()4511 child_range children() { return child_range(&Val, &Val+1); }
children()4512 const_child_range children() const {
4513 return const_child_range(&Val, &Val + 1);
4514 }
4515 };
4516
4517 /// Represents a function call to one of __builtin_LINE(), __builtin_COLUMN(),
4518 /// __builtin_FUNCTION(), or __builtin_FILE().
4519 class SourceLocExpr final : public Expr {
4520 SourceLocation BuiltinLoc, RParenLoc;
4521 DeclContext *ParentContext;
4522
4523 public:
4524 enum IdentKind { Function, File, Line, Column };
4525
4526 SourceLocExpr(const ASTContext &Ctx, IdentKind Type, SourceLocation BLoc,
4527 SourceLocation RParenLoc, DeclContext *Context);
4528
4529 /// Build an empty call expression.
SourceLocExpr(EmptyShell Empty)4530 explicit SourceLocExpr(EmptyShell Empty) : Expr(SourceLocExprClass, Empty) {}
4531
4532 /// Return the result of evaluating this SourceLocExpr in the specified
4533 /// (and possibly null) default argument or initialization context.
4534 APValue EvaluateInContext(const ASTContext &Ctx,
4535 const Expr *DefaultExpr) const;
4536
4537 /// Return a string representing the name of the specific builtin function.
4538 StringRef getBuiltinStr() const;
4539
getIdentKind()4540 IdentKind getIdentKind() const {
4541 return static_cast<IdentKind>(SourceLocExprBits.Kind);
4542 }
4543
isStringType()4544 bool isStringType() const {
4545 switch (getIdentKind()) {
4546 case File:
4547 case Function:
4548 return true;
4549 case Line:
4550 case Column:
4551 return false;
4552 }
4553 llvm_unreachable("unknown source location expression kind");
4554 }
isIntType()4555 bool isIntType() const LLVM_READONLY { return !isStringType(); }
4556
4557 /// If the SourceLocExpr has been resolved return the subexpression
4558 /// representing the resolved value. Otherwise return null.
getParentContext()4559 const DeclContext *getParentContext() const { return ParentContext; }
getParentContext()4560 DeclContext *getParentContext() { return ParentContext; }
4561
getLocation()4562 SourceLocation getLocation() const { return BuiltinLoc; }
getBeginLoc()4563 SourceLocation getBeginLoc() const { return BuiltinLoc; }
getEndLoc()4564 SourceLocation getEndLoc() const { return RParenLoc; }
4565
children()4566 child_range children() {
4567 return child_range(child_iterator(), child_iterator());
4568 }
4569
children()4570 const_child_range children() const {
4571 return const_child_range(child_iterator(), child_iterator());
4572 }
4573
classof(const Stmt * T)4574 static bool classof(const Stmt *T) {
4575 return T->getStmtClass() == SourceLocExprClass;
4576 }
4577
4578 private:
4579 friend class ASTStmtReader;
4580 };
4581
4582 /// Describes an C or C++ initializer list.
4583 ///
4584 /// InitListExpr describes an initializer list, which can be used to
4585 /// initialize objects of different types, including
4586 /// struct/class/union types, arrays, and vectors. For example:
4587 ///
4588 /// @code
4589 /// struct foo x = { 1, { 2, 3 } };
4590 /// @endcode
4591 ///
4592 /// Prior to semantic analysis, an initializer list will represent the
4593 /// initializer list as written by the user, but will have the
4594 /// placeholder type "void". This initializer list is called the
4595 /// syntactic form of the initializer, and may contain C99 designated
4596 /// initializers (represented as DesignatedInitExprs), initializations
4597 /// of subobject members without explicit braces, and so on. Clients
4598 /// interested in the original syntax of the initializer list should
4599 /// use the syntactic form of the initializer list.
4600 ///
4601 /// After semantic analysis, the initializer list will represent the
4602 /// semantic form of the initializer, where the initializations of all
4603 /// subobjects are made explicit with nested InitListExpr nodes and
4604 /// C99 designators have been eliminated by placing the designated
4605 /// initializations into the subobject they initialize. Additionally,
4606 /// any "holes" in the initialization, where no initializer has been
4607 /// specified for a particular subobject, will be replaced with
4608 /// implicitly-generated ImplicitValueInitExpr expressions that
4609 /// value-initialize the subobjects. Note, however, that the
4610 /// initializer lists may still have fewer initializers than there are
4611 /// elements to initialize within the object.
4612 ///
4613 /// After semantic analysis has completed, given an initializer list,
4614 /// method isSemanticForm() returns true if and only if this is the
4615 /// semantic form of the initializer list (note: the same AST node
4616 /// may at the same time be the syntactic form).
4617 /// Given the semantic form of the initializer list, one can retrieve
4618 /// the syntactic form of that initializer list (when different)
4619 /// using method getSyntacticForm(); the method returns null if applied
4620 /// to a initializer list which is already in syntactic form.
4621 /// Similarly, given the syntactic form (i.e., an initializer list such
4622 /// that isSemanticForm() returns false), one can retrieve the semantic
4623 /// form using method getSemanticForm().
4624 /// Since many initializer lists have the same syntactic and semantic forms,
4625 /// getSyntacticForm() may return NULL, indicating that the current
4626 /// semantic initializer list also serves as its syntactic form.
4627 class InitListExpr : public Expr {
4628 // FIXME: Eliminate this vector in favor of ASTContext allocation
4629 typedef ASTVector<Stmt *> InitExprsTy;
4630 InitExprsTy InitExprs;
4631 SourceLocation LBraceLoc, RBraceLoc;
4632
4633 /// The alternative form of the initializer list (if it exists).
4634 /// The int part of the pair stores whether this initializer list is
4635 /// in semantic form. If not null, the pointer points to:
4636 /// - the syntactic form, if this is in semantic form;
4637 /// - the semantic form, if this is in syntactic form.
4638 llvm::PointerIntPair<InitListExpr *, 1, bool> AltForm;
4639
4640 /// Either:
4641 /// If this initializer list initializes an array with more elements than
4642 /// there are initializers in the list, specifies an expression to be used
4643 /// for value initialization of the rest of the elements.
4644 /// Or
4645 /// If this initializer list initializes a union, specifies which
4646 /// field within the union will be initialized.
4647 llvm::PointerUnion<Expr *, FieldDecl *> ArrayFillerOrUnionFieldInit;
4648
4649 public:
4650 InitListExpr(const ASTContext &C, SourceLocation lbraceloc,
4651 ArrayRef<Expr*> initExprs, SourceLocation rbraceloc);
4652
4653 /// Build an empty initializer list.
InitListExpr(EmptyShell Empty)4654 explicit InitListExpr(EmptyShell Empty)
4655 : Expr(InitListExprClass, Empty), AltForm(nullptr, true) { }
4656
getNumInits()4657 unsigned getNumInits() const { return InitExprs.size(); }
4658
4659 /// Retrieve the set of initializers.
getInits()4660 Expr **getInits() { return reinterpret_cast<Expr **>(InitExprs.data()); }
4661
4662 /// Retrieve the set of initializers.
getInits()4663 Expr * const *getInits() const {
4664 return reinterpret_cast<Expr * const *>(InitExprs.data());
4665 }
4666
inits()4667 ArrayRef<Expr *> inits() {
4668 return llvm::makeArrayRef(getInits(), getNumInits());
4669 }
4670
inits()4671 ArrayRef<Expr *> inits() const {
4672 return llvm::makeArrayRef(getInits(), getNumInits());
4673 }
4674
getInit(unsigned Init)4675 const Expr *getInit(unsigned Init) const {
4676 assert(Init < getNumInits() && "Initializer access out of range!");
4677 return cast_or_null<Expr>(InitExprs[Init]);
4678 }
4679
getInit(unsigned Init)4680 Expr *getInit(unsigned Init) {
4681 assert(Init < getNumInits() && "Initializer access out of range!");
4682 return cast_or_null<Expr>(InitExprs[Init]);
4683 }
4684
setInit(unsigned Init,Expr * expr)4685 void setInit(unsigned Init, Expr *expr) {
4686 assert(Init < getNumInits() && "Initializer access out of range!");
4687 InitExprs[Init] = expr;
4688
4689 if (expr)
4690 setDependence(getDependence() | expr->getDependence());
4691 }
4692
4693 /// Reserve space for some number of initializers.
4694 void reserveInits(const ASTContext &C, unsigned NumInits);
4695
4696 /// Specify the number of initializers
4697 ///
4698 /// If there are more than @p NumInits initializers, the remaining
4699 /// initializers will be destroyed. If there are fewer than @p
4700 /// NumInits initializers, NULL expressions will be added for the
4701 /// unknown initializers.
4702 void resizeInits(const ASTContext &Context, unsigned NumInits);
4703
4704 /// Updates the initializer at index @p Init with the new
4705 /// expression @p expr, and returns the old expression at that
4706 /// location.
4707 ///
4708 /// When @p Init is out of range for this initializer list, the
4709 /// initializer list will be extended with NULL expressions to
4710 /// accommodate the new entry.
4711 Expr *updateInit(const ASTContext &C, unsigned Init, Expr *expr);
4712
4713 /// If this initializer list initializes an array with more elements
4714 /// than there are initializers in the list, specifies an expression to be
4715 /// used for value initialization of the rest of the elements.
getArrayFiller()4716 Expr *getArrayFiller() {
4717 return ArrayFillerOrUnionFieldInit.dyn_cast<Expr *>();
4718 }
getArrayFiller()4719 const Expr *getArrayFiller() const {
4720 return const_cast<InitListExpr *>(this)->getArrayFiller();
4721 }
4722 void setArrayFiller(Expr *filler);
4723
4724 /// Return true if this is an array initializer and its array "filler"
4725 /// has been set.
hasArrayFiller()4726 bool hasArrayFiller() const { return getArrayFiller(); }
4727
4728 /// If this initializes a union, specifies which field in the
4729 /// union to initialize.
4730 ///
4731 /// Typically, this field is the first named field within the
4732 /// union. However, a designated initializer can specify the
4733 /// initialization of a different field within the union.
getInitializedFieldInUnion()4734 FieldDecl *getInitializedFieldInUnion() {
4735 return ArrayFillerOrUnionFieldInit.dyn_cast<FieldDecl *>();
4736 }
getInitializedFieldInUnion()4737 const FieldDecl *getInitializedFieldInUnion() const {
4738 return const_cast<InitListExpr *>(this)->getInitializedFieldInUnion();
4739 }
setInitializedFieldInUnion(FieldDecl * FD)4740 void setInitializedFieldInUnion(FieldDecl *FD) {
4741 assert((FD == nullptr
4742 || getInitializedFieldInUnion() == nullptr
4743 || getInitializedFieldInUnion() == FD)
4744 && "Only one field of a union may be initialized at a time!");
4745 ArrayFillerOrUnionFieldInit = FD;
4746 }
4747
4748 // Explicit InitListExpr's originate from source code (and have valid source
4749 // locations). Implicit InitListExpr's are created by the semantic analyzer.
4750 // FIXME: This is wrong; InitListExprs created by semantic analysis have
4751 // valid source locations too!
isExplicit()4752 bool isExplicit() const {
4753 return LBraceLoc.isValid() && RBraceLoc.isValid();
4754 }
4755
4756 // Is this an initializer for an array of characters, initialized by a string
4757 // literal or an @encode?
4758 bool isStringLiteralInit() const;
4759
4760 /// Is this a transparent initializer list (that is, an InitListExpr that is
4761 /// purely syntactic, and whose semantics are that of the sole contained
4762 /// initializer)?
4763 bool isTransparent() const;
4764
4765 /// Is this the zero initializer {0} in a language which considers it
4766 /// idiomatic?
4767 bool isIdiomaticZeroInitializer(const LangOptions &LangOpts) const;
4768
getLBraceLoc()4769 SourceLocation getLBraceLoc() const { return LBraceLoc; }
setLBraceLoc(SourceLocation Loc)4770 void setLBraceLoc(SourceLocation Loc) { LBraceLoc = Loc; }
getRBraceLoc()4771 SourceLocation getRBraceLoc() const { return RBraceLoc; }
setRBraceLoc(SourceLocation Loc)4772 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; }
4773
isSemanticForm()4774 bool isSemanticForm() const { return AltForm.getInt(); }
getSemanticForm()4775 InitListExpr *getSemanticForm() const {
4776 return isSemanticForm() ? nullptr : AltForm.getPointer();
4777 }
isSyntacticForm()4778 bool isSyntacticForm() const {
4779 return !AltForm.getInt() || !AltForm.getPointer();
4780 }
getSyntacticForm()4781 InitListExpr *getSyntacticForm() const {
4782 return isSemanticForm() ? AltForm.getPointer() : nullptr;
4783 }
4784
setSyntacticForm(InitListExpr * Init)4785 void setSyntacticForm(InitListExpr *Init) {
4786 AltForm.setPointer(Init);
4787 AltForm.setInt(true);
4788 Init->AltForm.setPointer(this);
4789 Init->AltForm.setInt(false);
4790 }
4791
hadArrayRangeDesignator()4792 bool hadArrayRangeDesignator() const {
4793 return InitListExprBits.HadArrayRangeDesignator != 0;
4794 }
4795 void sawArrayRangeDesignator(bool ARD = true) {
4796 InitListExprBits.HadArrayRangeDesignator = ARD;
4797 }
4798
4799 SourceLocation getBeginLoc() const LLVM_READONLY;
4800 SourceLocation getEndLoc() const LLVM_READONLY;
4801
classof(const Stmt * T)4802 static bool classof(const Stmt *T) {
4803 return T->getStmtClass() == InitListExprClass;
4804 }
4805
4806 // Iterators
children()4807 child_range children() {
4808 const_child_range CCR = const_cast<const InitListExpr *>(this)->children();
4809 return child_range(cast_away_const(CCR.begin()),
4810 cast_away_const(CCR.end()));
4811 }
4812
children()4813 const_child_range children() const {
4814 // FIXME: This does not include the array filler expression.
4815 if (InitExprs.empty())
4816 return const_child_range(const_child_iterator(), const_child_iterator());
4817 return const_child_range(&InitExprs[0], &InitExprs[0] + InitExprs.size());
4818 }
4819
4820 typedef InitExprsTy::iterator iterator;
4821 typedef InitExprsTy::const_iterator const_iterator;
4822 typedef InitExprsTy::reverse_iterator reverse_iterator;
4823 typedef InitExprsTy::const_reverse_iterator const_reverse_iterator;
4824
begin()4825 iterator begin() { return InitExprs.begin(); }
begin()4826 const_iterator begin() const { return InitExprs.begin(); }
end()4827 iterator end() { return InitExprs.end(); }
end()4828 const_iterator end() const { return InitExprs.end(); }
rbegin()4829