1//===- ExprObjC.cpp - (ObjC) Expression AST Node Implementation -----------===//
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 implements the subclesses of Expr class declared in ExprObjC.h
10//
11//===----------------------------------------------------------------------===//
12
13#include "clang/AST/ExprObjC.h"
14#include "clang/AST/ASTContext.h"
15#include "clang/AST/ComputeDependence.h"
16#include "clang/AST/DependenceFlags.h"
17#include "clang/AST/SelectorLocationsKind.h"
18#include "clang/AST/Type.h"
19#include "clang/AST/TypeLoc.h"
20#include "llvm/ADT/SmallVector.h"
21#include "llvm/Support/ErrorHandling.h"
22#include <algorithm>
23#include <cassert>
24#include <cstdint>
25
26using namespace clang;
27
28ObjCArrayLiteral::ObjCArrayLiteral(ArrayRef<Expr *> Elements, QualType T,
29 ObjCMethodDecl *Method, SourceRange SR)
30 : Expr(ObjCArrayLiteralClass, T, VK_PRValue, OK_Ordinary),
31 NumElements(Elements.size()), Range(SR), ArrayWithObjectsMethod(Method) {
32 Expr **SaveElements = getElements();
33 for (unsigned I = 0, N = Elements.size(); I != N; ++I)
34 SaveElements[I] = Elements[I];
35
36 setDependence(computeDependence(E: this));
37}
38
39ObjCArrayLiteral *ObjCArrayLiteral::Create(const ASTContext &C,
40 ArrayRef<Expr *> Elements,
41 QualType T, ObjCMethodDecl *Method,
42 SourceRange SR) {
43 void *Mem = C.Allocate(Size: totalSizeToAlloc<Expr *>(Counts: Elements.size()));
44 return new (Mem) ObjCArrayLiteral(Elements, T, Method, SR);
45}
46
47ObjCArrayLiteral *ObjCArrayLiteral::CreateEmpty(const ASTContext &C,
48 unsigned NumElements) {
49 void *Mem = C.Allocate(Size: totalSizeToAlloc<Expr *>(Counts: NumElements));
50 return new (Mem) ObjCArrayLiteral(EmptyShell(), NumElements);
51}
52
53ObjCDictionaryLiteral::ObjCDictionaryLiteral(ArrayRef<ObjCDictionaryElement> VK,
54 bool HasPackExpansions, QualType T,
55 ObjCMethodDecl *method,
56 SourceRange SR)
57 : Expr(ObjCDictionaryLiteralClass, T, VK_PRValue, OK_Ordinary),
58 NumElements(VK.size()), HasPackExpansions(HasPackExpansions), Range(SR),
59 DictWithObjectsMethod(method) {
60 KeyValuePair *KeyValues = getTrailingObjects<KeyValuePair>();
61 ExpansionData *Expansions =
62 HasPackExpansions ? getTrailingObjects<ExpansionData>() : nullptr;
63 for (unsigned I = 0; I < NumElements; I++) {
64 KeyValues[I].Key = VK[I].Key;
65 KeyValues[I].Value = VK[I].Value;
66 if (Expansions) {
67 Expansions[I].EllipsisLoc = VK[I].EllipsisLoc;
68 if (VK[I].NumExpansions)
69 Expansions[I].NumExpansionsPlusOne = *VK[I].NumExpansions + 1;
70 else
71 Expansions[I].NumExpansionsPlusOne = 0;
72 }
73 }
74 setDependence(computeDependence(E: this));
75}
76
77ObjCDictionaryLiteral *
78ObjCDictionaryLiteral::Create(const ASTContext &C,
79 ArrayRef<ObjCDictionaryElement> VK,
80 bool HasPackExpansions, QualType T,
81 ObjCMethodDecl *method, SourceRange SR) {
82 void *Mem = C.Allocate(Size: totalSizeToAlloc<KeyValuePair, ExpansionData>(
83 Counts: VK.size(), Counts: HasPackExpansions ? VK.size() : 0));
84 return new (Mem) ObjCDictionaryLiteral(VK, HasPackExpansions, T, method, SR);
85}
86
87ObjCDictionaryLiteral *
88ObjCDictionaryLiteral::CreateEmpty(const ASTContext &C, unsigned NumElements,
89 bool HasPackExpansions) {
90 void *Mem = C.Allocate(Size: totalSizeToAlloc<KeyValuePair, ExpansionData>(
91 Counts: NumElements, Counts: HasPackExpansions ? NumElements : 0));
92 return new (Mem)
93 ObjCDictionaryLiteral(EmptyShell(), NumElements, HasPackExpansions);
94}
95
96QualType ObjCPropertyRefExpr::getReceiverType(const ASTContext &ctx) const {
97 if (isClassReceiver())
98 return ctx.getObjCInterfaceType(Decl: getClassReceiver());
99
100 if (isSuperReceiver())
101 return getSuperReceiverType();
102
103 return getBase()->getType();
104}
105
106ObjCMessageExpr::ObjCMessageExpr(QualType T, ExprValueKind VK,
107 SourceLocation LBracLoc,
108 SourceLocation SuperLoc, bool IsInstanceSuper,
109 QualType SuperType, Selector Sel,
110 ArrayRef<SourceLocation> SelLocs,
111 SelectorLocationsKind SelLocsK,
112 ObjCMethodDecl *Method, ArrayRef<Expr *> Args,
113 SourceLocation RBracLoc, bool isImplicit)
114 : Expr(ObjCMessageExprClass, T, VK, OK_Ordinary),
115 SelectorOrMethod(
116 reinterpret_cast<uintptr_t>(Method ? Method : Sel.getAsOpaquePtr())),
117 Kind(IsInstanceSuper ? SuperInstance : SuperClass),
118 HasMethod(Method != nullptr), IsDelegateInitCall(false),
119 IsImplicit(isImplicit), SuperLoc(SuperLoc), LBracLoc(LBracLoc),
120 RBracLoc(RBracLoc) {
121 initArgsAndSelLocs(Args, SelLocs, SelLocsK);
122 setReceiverPointer(SuperType.getAsOpaquePtr());
123 setDependence(computeDependence(E: this));
124}
125
126ObjCMessageExpr::ObjCMessageExpr(QualType T, ExprValueKind VK,
127 SourceLocation LBracLoc,
128 TypeSourceInfo *Receiver, Selector Sel,
129 ArrayRef<SourceLocation> SelLocs,
130 SelectorLocationsKind SelLocsK,
131 ObjCMethodDecl *Method, ArrayRef<Expr *> Args,
132 SourceLocation RBracLoc, bool isImplicit)
133 : Expr(ObjCMessageExprClass, T, VK, OK_Ordinary),
134 SelectorOrMethod(
135 reinterpret_cast<uintptr_t>(Method ? Method : Sel.getAsOpaquePtr())),
136 Kind(Class), HasMethod(Method != nullptr), IsDelegateInitCall(false),
137 IsImplicit(isImplicit), LBracLoc(LBracLoc), RBracLoc(RBracLoc) {
138 initArgsAndSelLocs(Args, SelLocs, SelLocsK);
139 setReceiverPointer(Receiver);
140 setDependence(computeDependence(E: this));
141}
142
143ObjCMessageExpr::ObjCMessageExpr(QualType T, ExprValueKind VK,
144 SourceLocation LBracLoc, Expr *Receiver,
145 Selector Sel, ArrayRef<SourceLocation> SelLocs,
146 SelectorLocationsKind SelLocsK,
147 ObjCMethodDecl *Method, ArrayRef<Expr *> Args,
148 SourceLocation RBracLoc, bool isImplicit)
149 : Expr(ObjCMessageExprClass, T, VK, OK_Ordinary),
150 SelectorOrMethod(
151 reinterpret_cast<uintptr_t>(Method ? Method : Sel.getAsOpaquePtr())),
152 Kind(Instance), HasMethod(Method != nullptr), IsDelegateInitCall(false),
153 IsImplicit(isImplicit), LBracLoc(LBracLoc), RBracLoc(RBracLoc) {
154 initArgsAndSelLocs(Args, SelLocs, SelLocsK);
155 setReceiverPointer(Receiver);
156 setDependence(computeDependence(E: this));
157}
158
159void ObjCMessageExpr::initArgsAndSelLocs(ArrayRef<Expr *> Args,
160 ArrayRef<SourceLocation> SelLocs,
161 SelectorLocationsKind SelLocsK) {
162 setNumArgs(Args.size());
163 Expr **MyArgs = getArgs();
164 for (unsigned I = 0; I != Args.size(); ++I)
165 MyArgs[I] = Args[I];
166
167 SelLocsKind = SelLocsK;
168 if (!isImplicit()) {
169 if (SelLocsK == SelLoc_NonStandard)
170 std::copy(first: SelLocs.begin(), last: SelLocs.end(), result: getStoredSelLocs());
171 }
172}
173
174ObjCMessageExpr *
175ObjCMessageExpr::Create(const ASTContext &Context, QualType T, ExprValueKind VK,
176 SourceLocation LBracLoc, SourceLocation SuperLoc,
177 bool IsInstanceSuper, QualType SuperType, Selector Sel,
178 ArrayRef<SourceLocation> SelLocs,
179 ObjCMethodDecl *Method, ArrayRef<Expr *> Args,
180 SourceLocation RBracLoc, bool isImplicit) {
181 assert((!SelLocs.empty() || isImplicit) &&
182 "No selector locs for non-implicit message");
183 ObjCMessageExpr *Mem;
184 SelectorLocationsKind SelLocsK = SelectorLocationsKind();
185 if (isImplicit)
186 Mem = alloc(C: Context, NumArgs: Args.size(), NumStoredSelLocs: 0);
187 else
188 Mem = alloc(C: Context, Args, RBraceLoc: RBracLoc, SelLocs, Sel, SelLocsK);
189 return new (Mem) ObjCMessageExpr(T, VK, LBracLoc, SuperLoc, IsInstanceSuper,
190 SuperType, Sel, SelLocs, SelLocsK, Method,
191 Args, RBracLoc, isImplicit);
192}
193
194ObjCMessageExpr *
195ObjCMessageExpr::Create(const ASTContext &Context, QualType T, ExprValueKind VK,
196 SourceLocation LBracLoc, TypeSourceInfo *Receiver,
197 Selector Sel, ArrayRef<SourceLocation> SelLocs,
198 ObjCMethodDecl *Method, ArrayRef<Expr *> Args,
199 SourceLocation RBracLoc, bool isImplicit) {
200 assert((!SelLocs.empty() || isImplicit) &&
201 "No selector locs for non-implicit message");
202 ObjCMessageExpr *Mem;
203 SelectorLocationsKind SelLocsK = SelectorLocationsKind();
204 if (isImplicit)
205 Mem = alloc(C: Context, NumArgs: Args.size(), NumStoredSelLocs: 0);
206 else
207 Mem = alloc(C: Context, Args, RBraceLoc: RBracLoc, SelLocs, Sel, SelLocsK);
208 return new (Mem)
209 ObjCMessageExpr(T, VK, LBracLoc, Receiver, Sel, SelLocs, SelLocsK, Method,
210 Args, RBracLoc, isImplicit);
211}
212
213ObjCMessageExpr *
214ObjCMessageExpr::Create(const ASTContext &Context, QualType T, ExprValueKind VK,
215 SourceLocation LBracLoc, Expr *Receiver, Selector Sel,
216 ArrayRef<SourceLocation> SelLocs,
217 ObjCMethodDecl *Method, ArrayRef<Expr *> Args,
218 SourceLocation RBracLoc, bool isImplicit) {
219 assert((!SelLocs.empty() || isImplicit) &&
220 "No selector locs for non-implicit message");
221 ObjCMessageExpr *Mem;
222 SelectorLocationsKind SelLocsK = SelectorLocationsKind();
223 if (isImplicit)
224 Mem = alloc(C: Context, NumArgs: Args.size(), NumStoredSelLocs: 0);
225 else
226 Mem = alloc(C: Context, Args, RBraceLoc: RBracLoc, SelLocs, Sel, SelLocsK);
227 return new (Mem)
228 ObjCMessageExpr(T, VK, LBracLoc, Receiver, Sel, SelLocs, SelLocsK, Method,
229 Args, RBracLoc, isImplicit);
230}
231
232ObjCMessageExpr *ObjCMessageExpr::CreateEmpty(const ASTContext &Context,
233 unsigned NumArgs,
234 unsigned NumStoredSelLocs) {
235 ObjCMessageExpr *Mem = alloc(C: Context, NumArgs, NumStoredSelLocs);
236 return new (Mem) ObjCMessageExpr(EmptyShell(), NumArgs);
237}
238
239ObjCMessageExpr *ObjCMessageExpr::alloc(const ASTContext &C,
240 ArrayRef<Expr *> Args,
241 SourceLocation RBraceLoc,
242 ArrayRef<SourceLocation> SelLocs,
243 Selector Sel,
244 SelectorLocationsKind &SelLocsK) {
245 SelLocsK = hasStandardSelectorLocs(Sel, SelLocs, Args, EndLoc: RBraceLoc);
246 unsigned NumStoredSelLocs =
247 (SelLocsK == SelLoc_NonStandard) ? SelLocs.size() : 0;
248 return alloc(C, NumArgs: Args.size(), NumStoredSelLocs);
249}
250
251ObjCMessageExpr *ObjCMessageExpr::alloc(const ASTContext &C, unsigned NumArgs,
252 unsigned NumStoredSelLocs) {
253 return (ObjCMessageExpr *)C.Allocate(
254 Size: totalSizeToAlloc<void *, SourceLocation>(Counts: NumArgs + 1, Counts: NumStoredSelLocs),
255 Align: alignof(ObjCMessageExpr));
256}
257
258void ObjCMessageExpr::getSelectorLocs(
259 SmallVectorImpl<SourceLocation> &SelLocs) const {
260 for (unsigned i = 0, e = getNumSelectorLocs(); i != e; ++i)
261 SelLocs.push_back(Elt: getSelectorLoc(Index: i));
262}
263
264
265QualType ObjCMessageExpr::getCallReturnType(ASTContext &Ctx) const {
266 if (const ObjCMethodDecl *MD = getMethodDecl()) {
267 QualType QT = MD->getReturnType();
268 if (QT == Ctx.getObjCInstanceType()) {
269 // instancetype corresponds to expression types.
270 return getType();
271 }
272 return QT;
273 }
274 return Ctx.getReferenceQualifiedType(this);
275}
276
277SourceRange ObjCMessageExpr::getReceiverRange() const {
278 switch (getReceiverKind()) {
279 case Instance:
280 return getInstanceReceiver()->getSourceRange();
281
282 case Class:
283 return getClassReceiverTypeInfo()->getTypeLoc().getSourceRange();
284
285 case SuperInstance:
286 case SuperClass:
287 return getSuperLoc();
288 }
289
290 llvm_unreachable("Invalid ReceiverKind!");
291}
292
293Selector ObjCMessageExpr::getSelector() const {
294 if (HasMethod)
295 return reinterpret_cast<const ObjCMethodDecl *>(SelectorOrMethod)
296 ->getSelector();
297 return Selector(SelectorOrMethod);
298}
299
300QualType ObjCMessageExpr::getReceiverType() const {
301 switch (getReceiverKind()) {
302 case Instance:
303 return getInstanceReceiver()->getType();
304 case Class:
305 return getClassReceiver();
306 case SuperInstance:
307 case SuperClass:
308 return getSuperType();
309 }
310
311 llvm_unreachable("unexpected receiver kind");
312}
313
314ObjCInterfaceDecl *ObjCMessageExpr::getReceiverInterface() const {
315 QualType T = getReceiverType();
316
317 if (const ObjCObjectPointerType *Ptr = T->getAs<ObjCObjectPointerType>())
318 return Ptr->getInterfaceDecl();
319
320 if (const ObjCObjectType *Ty = T->getAs<ObjCObjectType>())
321 return Ty->getInterface();
322
323 return nullptr;
324}
325
326Stmt::child_range ObjCMessageExpr::children() {
327 Stmt **begin;
328 if (getReceiverKind() == Instance)
329 begin = reinterpret_cast<Stmt **>(getTrailingObjects<void *>());
330 else
331 begin = reinterpret_cast<Stmt **>(getArgs());
332 return child_range(begin,
333 reinterpret_cast<Stmt **>(getArgs() + getNumArgs()));
334}
335
336Stmt::const_child_range ObjCMessageExpr::children() const {
337 auto Children = const_cast<ObjCMessageExpr *>(this)->children();
338 return const_child_range(Children.begin(), Children.end());
339}
340
341StringRef ObjCBridgedCastExpr::getBridgeKindName() const {
342 switch (getBridgeKind()) {
343 case OBC_Bridge:
344 return "__bridge";
345 case OBC_BridgeTransfer:
346 return "__bridge_transfer";
347 case OBC_BridgeRetained:
348 return "__bridge_retained";
349 }
350
351 llvm_unreachable("Invalid BridgeKind!");
352}
353

source code of clang/lib/AST/ExprObjC.cpp