Bug Summary

File:clang/lib/Sema/SemaType.cpp
Warning:line 8355, column 24
Called C++ object pointer is null

Annotated Source Code

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clang -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name SemaType.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -analyzer-config-compatibility-mode=true -mrelocation-model pic -pic-level 2 -mthread-model posix -mframe-pointer=none -relaxed-aliasing -fmath-errno -fno-rounding-math -masm-verbose -mconstructor-aliases -munwind-tables -target-cpu x86-64 -dwarf-column-info -fno-split-dwarf-inlining -debugger-tuning=gdb -ffunction-sections -fdata-sections -resource-dir /usr/lib/llvm-10/lib/clang/10.0.0 -D CLANG_VENDOR="Debian " -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/build-llvm/tools/clang/lib/Sema -I /build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema -I /build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/include -I /build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/build-llvm/tools/clang/include -I /build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/build-llvm/include -I /build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/llvm/include -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/x86_64-linux-gnu/c++/6.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/6.3.0/../../../../include/c++/6.3.0/backward -internal-isystem /usr/local/include -internal-isystem /usr/lib/llvm-10/lib/clang/10.0.0/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O2 -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-comment -std=c++14 -fdeprecated-macro -fdebug-compilation-dir /build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/build-llvm/tools/clang/lib/Sema -fdebug-prefix-map=/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd=. -ferror-limit 19 -fmessage-length 0 -fvisibility-inlines-hidden -stack-protector 2 -fgnuc-version=4.2.1 -fobjc-runtime=gcc -fno-common -fdiagnostics-show-option -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -faddrsig -o /tmp/scan-build-2020-01-13-084841-49055-1 -x c++ /build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp
1//===--- SemaType.cpp - Semantic Analysis for Types -----------------------===//
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 type-related semantic analysis.
10//
11//===----------------------------------------------------------------------===//
12
13#include "TypeLocBuilder.h"
14#include "clang/AST/ASTConsumer.h"
15#include "clang/AST/ASTContext.h"
16#include "clang/AST/ASTMutationListener.h"
17#include "clang/AST/ASTStructuralEquivalence.h"
18#include "clang/AST/CXXInheritance.h"
19#include "clang/AST/DeclObjC.h"
20#include "clang/AST/DeclTemplate.h"
21#include "clang/AST/Expr.h"
22#include "clang/AST/TypeLoc.h"
23#include "clang/AST/TypeLocVisitor.h"
24#include "clang/Basic/PartialDiagnostic.h"
25#include "clang/Basic/TargetInfo.h"
26#include "clang/Lex/Preprocessor.h"
27#include "clang/Sema/DeclSpec.h"
28#include "clang/Sema/DelayedDiagnostic.h"
29#include "clang/Sema/Lookup.h"
30#include "clang/Sema/ScopeInfo.h"
31#include "clang/Sema/SemaInternal.h"
32#include "clang/Sema/Template.h"
33#include "clang/Sema/TemplateInstCallback.h"
34#include "llvm/ADT/SmallPtrSet.h"
35#include "llvm/ADT/SmallString.h"
36#include "llvm/ADT/StringSwitch.h"
37#include "llvm/Support/ErrorHandling.h"
38
39using namespace clang;
40
41enum TypeDiagSelector {
42 TDS_Function,
43 TDS_Pointer,
44 TDS_ObjCObjOrBlock
45};
46
47/// isOmittedBlockReturnType - Return true if this declarator is missing a
48/// return type because this is a omitted return type on a block literal.
49static bool isOmittedBlockReturnType(const Declarator &D) {
50 if (D.getContext() != DeclaratorContext::BlockLiteralContext ||
51 D.getDeclSpec().hasTypeSpecifier())
52 return false;
53
54 if (D.getNumTypeObjects() == 0)
55 return true; // ^{ ... }
56
57 if (D.getNumTypeObjects() == 1 &&
58 D.getTypeObject(0).Kind == DeclaratorChunk::Function)
59 return true; // ^(int X, float Y) { ... }
60
61 return false;
62}
63
64/// diagnoseBadTypeAttribute - Diagnoses a type attribute which
65/// doesn't apply to the given type.
66static void diagnoseBadTypeAttribute(Sema &S, const ParsedAttr &attr,
67 QualType type) {
68 TypeDiagSelector WhichType;
69 bool useExpansionLoc = true;
70 switch (attr.getKind()) {
71 case ParsedAttr::AT_ObjCGC:
72 WhichType = TDS_Pointer;
73 break;
74 case ParsedAttr::AT_ObjCOwnership:
75 WhichType = TDS_ObjCObjOrBlock;
76 break;
77 default:
78 // Assume everything else was a function attribute.
79 WhichType = TDS_Function;
80 useExpansionLoc = false;
81 break;
82 }
83
84 SourceLocation loc = attr.getLoc();
85 StringRef name = attr.getAttrName()->getName();
86
87 // The GC attributes are usually written with macros; special-case them.
88 IdentifierInfo *II = attr.isArgIdent(0) ? attr.getArgAsIdent(0)->Ident
89 : nullptr;
90 if (useExpansionLoc && loc.isMacroID() && II) {
91 if (II->isStr("strong")) {
92 if (S.findMacroSpelling(loc, "__strong")) name = "__strong";
93 } else if (II->isStr("weak")) {
94 if (S.findMacroSpelling(loc, "__weak")) name = "__weak";
95 }
96 }
97
98 S.Diag(loc, diag::warn_type_attribute_wrong_type) << name << WhichType
99 << type;
100}
101
102// objc_gc applies to Objective-C pointers or, otherwise, to the
103// smallest available pointer type (i.e. 'void*' in 'void**').
104#define OBJC_POINTER_TYPE_ATTRS_CASELISTcase ParsedAttr::AT_ObjCGC: case ParsedAttr::AT_ObjCOwnership \
105 case ParsedAttr::AT_ObjCGC: \
106 case ParsedAttr::AT_ObjCOwnership
107
108// Calling convention attributes.
109#define CALLING_CONV_ATTRS_CASELISTcase ParsedAttr::AT_CDecl: case ParsedAttr::AT_FastCall: case
ParsedAttr::AT_StdCall: case ParsedAttr::AT_ThisCall: case ParsedAttr
::AT_RegCall: case ParsedAttr::AT_Pascal: case ParsedAttr::AT_SwiftCall
: case ParsedAttr::AT_VectorCall: case ParsedAttr::AT_AArch64VectorPcs
: case ParsedAttr::AT_MSABI: case ParsedAttr::AT_SysVABI: case
ParsedAttr::AT_Pcs: case ParsedAttr::AT_IntelOclBicc: case ParsedAttr
::AT_PreserveMost: case ParsedAttr::AT_PreserveAll
\
110 case ParsedAttr::AT_CDecl: \
111 case ParsedAttr::AT_FastCall: \
112 case ParsedAttr::AT_StdCall: \
113 case ParsedAttr::AT_ThisCall: \
114 case ParsedAttr::AT_RegCall: \
115 case ParsedAttr::AT_Pascal: \
116 case ParsedAttr::AT_SwiftCall: \
117 case ParsedAttr::AT_VectorCall: \
118 case ParsedAttr::AT_AArch64VectorPcs: \
119 case ParsedAttr::AT_MSABI: \
120 case ParsedAttr::AT_SysVABI: \
121 case ParsedAttr::AT_Pcs: \
122 case ParsedAttr::AT_IntelOclBicc: \
123 case ParsedAttr::AT_PreserveMost: \
124 case ParsedAttr::AT_PreserveAll
125
126// Function type attributes.
127#define FUNCTION_TYPE_ATTRS_CASELISTcase ParsedAttr::AT_NSReturnsRetained: case ParsedAttr::AT_NoReturn
: case ParsedAttr::AT_Regparm: case ParsedAttr::AT_AnyX86NoCallerSavedRegisters
: case ParsedAttr::AT_AnyX86NoCfCheck: case ParsedAttr::AT_CDecl
: case ParsedAttr::AT_FastCall: case ParsedAttr::AT_StdCall: case
ParsedAttr::AT_ThisCall: case ParsedAttr::AT_RegCall: case ParsedAttr
::AT_Pascal: case ParsedAttr::AT_SwiftCall: case ParsedAttr::
AT_VectorCall: case ParsedAttr::AT_AArch64VectorPcs: case ParsedAttr
::AT_MSABI: case ParsedAttr::AT_SysVABI: case ParsedAttr::AT_Pcs
: case ParsedAttr::AT_IntelOclBicc: case ParsedAttr::AT_PreserveMost
: case ParsedAttr::AT_PreserveAll
\
128 case ParsedAttr::AT_NSReturnsRetained: \
129 case ParsedAttr::AT_NoReturn: \
130 case ParsedAttr::AT_Regparm: \
131 case ParsedAttr::AT_AnyX86NoCallerSavedRegisters: \
132 case ParsedAttr::AT_AnyX86NoCfCheck: \
133 CALLING_CONV_ATTRS_CASELISTcase ParsedAttr::AT_CDecl: case ParsedAttr::AT_FastCall: case
ParsedAttr::AT_StdCall: case ParsedAttr::AT_ThisCall: case ParsedAttr
::AT_RegCall: case ParsedAttr::AT_Pascal: case ParsedAttr::AT_SwiftCall
: case ParsedAttr::AT_VectorCall: case ParsedAttr::AT_AArch64VectorPcs
: case ParsedAttr::AT_MSABI: case ParsedAttr::AT_SysVABI: case
ParsedAttr::AT_Pcs: case ParsedAttr::AT_IntelOclBicc: case ParsedAttr
::AT_PreserveMost: case ParsedAttr::AT_PreserveAll
134
135// Microsoft-specific type qualifiers.
136#define MS_TYPE_ATTRS_CASELISTcase ParsedAttr::AT_Ptr32: case ParsedAttr::AT_Ptr64: case ParsedAttr
::AT_SPtr: case ParsedAttr::AT_UPtr
\
137 case ParsedAttr::AT_Ptr32: \
138 case ParsedAttr::AT_Ptr64: \
139 case ParsedAttr::AT_SPtr: \
140 case ParsedAttr::AT_UPtr
141
142// Nullability qualifiers.
143#define NULLABILITY_TYPE_ATTRS_CASELISTcase ParsedAttr::AT_TypeNonNull: case ParsedAttr::AT_TypeNullable
: case ParsedAttr::AT_TypeNullUnspecified
\
144 case ParsedAttr::AT_TypeNonNull: \
145 case ParsedAttr::AT_TypeNullable: \
146 case ParsedAttr::AT_TypeNullUnspecified
147
148namespace {
149 /// An object which stores processing state for the entire
150 /// GetTypeForDeclarator process.
151 class TypeProcessingState {
152 Sema &sema;
153
154 /// The declarator being processed.
155 Declarator &declarator;
156
157 /// The index of the declarator chunk we're currently processing.
158 /// May be the total number of valid chunks, indicating the
159 /// DeclSpec.
160 unsigned chunkIndex;
161
162 /// Whether there are non-trivial modifications to the decl spec.
163 bool trivial;
164
165 /// Whether we saved the attributes in the decl spec.
166 bool hasSavedAttrs;
167
168 /// The original set of attributes on the DeclSpec.
169 SmallVector<ParsedAttr *, 2> savedAttrs;
170
171 /// A list of attributes to diagnose the uselessness of when the
172 /// processing is complete.
173 SmallVector<ParsedAttr *, 2> ignoredTypeAttrs;
174
175 /// Attributes corresponding to AttributedTypeLocs that we have not yet
176 /// populated.
177 // FIXME: The two-phase mechanism by which we construct Types and fill
178 // their TypeLocs makes it hard to correctly assign these. We keep the
179 // attributes in creation order as an attempt to make them line up
180 // properly.
181 using TypeAttrPair = std::pair<const AttributedType*, const Attr*>;
182 SmallVector<TypeAttrPair, 8> AttrsForTypes;
183 bool AttrsForTypesSorted = true;
184
185 /// MacroQualifiedTypes mapping to macro expansion locations that will be
186 /// stored in a MacroQualifiedTypeLoc.
187 llvm::DenseMap<const MacroQualifiedType *, SourceLocation> LocsForMacros;
188
189 /// Flag to indicate we parsed a noderef attribute. This is used for
190 /// validating that noderef was used on a pointer or array.
191 bool parsedNoDeref;
192
193 public:
194 TypeProcessingState(Sema &sema, Declarator &declarator)
195 : sema(sema), declarator(declarator),
196 chunkIndex(declarator.getNumTypeObjects()), trivial(true),
197 hasSavedAttrs(false), parsedNoDeref(false) {}
198
199 Sema &getSema() const {
200 return sema;
201 }
202
203 Declarator &getDeclarator() const {
204 return declarator;
205 }
206
207 bool isProcessingDeclSpec() const {
208 return chunkIndex == declarator.getNumTypeObjects();
209 }
210
211 unsigned getCurrentChunkIndex() const {
212 return chunkIndex;
213 }
214
215 void setCurrentChunkIndex(unsigned idx) {
216 assert(idx <= declarator.getNumTypeObjects())((idx <= declarator.getNumTypeObjects()) ? static_cast<
void> (0) : __assert_fail ("idx <= declarator.getNumTypeObjects()"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 216, __PRETTY_FUNCTION__))
;
217 chunkIndex = idx;
218 }
219
220 ParsedAttributesView &getCurrentAttributes() const {
221 if (isProcessingDeclSpec())
222 return getMutableDeclSpec().getAttributes();
223 return declarator.getTypeObject(chunkIndex).getAttrs();
224 }
225
226 /// Save the current set of attributes on the DeclSpec.
227 void saveDeclSpecAttrs() {
228 // Don't try to save them multiple times.
229 if (hasSavedAttrs) return;
230
231 DeclSpec &spec = getMutableDeclSpec();
232 for (ParsedAttr &AL : spec.getAttributes())
233 savedAttrs.push_back(&AL);
234 trivial &= savedAttrs.empty();
235 hasSavedAttrs = true;
236 }
237
238 /// Record that we had nowhere to put the given type attribute.
239 /// We will diagnose such attributes later.
240 void addIgnoredTypeAttr(ParsedAttr &attr) {
241 ignoredTypeAttrs.push_back(&attr);
242 }
243
244 /// Diagnose all the ignored type attributes, given that the
245 /// declarator worked out to the given type.
246 void diagnoseIgnoredTypeAttrs(QualType type) const {
247 for (auto *Attr : ignoredTypeAttrs)
248 diagnoseBadTypeAttribute(getSema(), *Attr, type);
249 }
250
251 /// Get an attributed type for the given attribute, and remember the Attr
252 /// object so that we can attach it to the AttributedTypeLoc.
253 QualType getAttributedType(Attr *A, QualType ModifiedType,
254 QualType EquivType) {
255 QualType T =
256 sema.Context.getAttributedType(A->getKind(), ModifiedType, EquivType);
257 AttrsForTypes.push_back({cast<AttributedType>(T.getTypePtr()), A});
258 AttrsForTypesSorted = false;
259 return T;
260 }
261
262 /// Completely replace the \c auto in \p TypeWithAuto by
263 /// \p Replacement. Also replace \p TypeWithAuto in \c TypeAttrPair if
264 /// necessary.
265 QualType ReplaceAutoType(QualType TypeWithAuto, QualType Replacement) {
266 QualType T = sema.ReplaceAutoType(TypeWithAuto, Replacement);
267 if (auto *AttrTy = TypeWithAuto->getAs<AttributedType>()) {
268 // Attributed type still should be an attributed type after replacement.
269 auto *NewAttrTy = cast<AttributedType>(T.getTypePtr());
270 for (TypeAttrPair &A : AttrsForTypes) {
271 if (A.first == AttrTy)
272 A.first = NewAttrTy;
273 }
274 AttrsForTypesSorted = false;
275 }
276 return T;
277 }
278
279 /// Extract and remove the Attr* for a given attributed type.
280 const Attr *takeAttrForAttributedType(const AttributedType *AT) {
281 if (!AttrsForTypesSorted) {
282 llvm::stable_sort(AttrsForTypes, llvm::less_first());
283 AttrsForTypesSorted = true;
284 }
285
286 // FIXME: This is quadratic if we have lots of reuses of the same
287 // attributed type.
288 for (auto It = std::partition_point(
289 AttrsForTypes.begin(), AttrsForTypes.end(),
290 [=](const TypeAttrPair &A) { return A.first < AT; });
291 It != AttrsForTypes.end() && It->first == AT; ++It) {
292 if (It->second) {
293 const Attr *Result = It->second;
294 It->second = nullptr;
295 return Result;
296 }
297 }
298
299 llvm_unreachable("no Attr* for AttributedType*")::llvm::llvm_unreachable_internal("no Attr* for AttributedType*"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 299)
;
300 }
301
302 SourceLocation
303 getExpansionLocForMacroQualifiedType(const MacroQualifiedType *MQT) const {
304 auto FoundLoc = LocsForMacros.find(MQT);
305 assert(FoundLoc != LocsForMacros.end() &&((FoundLoc != LocsForMacros.end() && "Unable to find macro expansion location for MacroQualifedType"
) ? static_cast<void> (0) : __assert_fail ("FoundLoc != LocsForMacros.end() && \"Unable to find macro expansion location for MacroQualifedType\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 306, __PRETTY_FUNCTION__))
306 "Unable to find macro expansion location for MacroQualifedType")((FoundLoc != LocsForMacros.end() && "Unable to find macro expansion location for MacroQualifedType"
) ? static_cast<void> (0) : __assert_fail ("FoundLoc != LocsForMacros.end() && \"Unable to find macro expansion location for MacroQualifedType\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 306, __PRETTY_FUNCTION__))
;
307 return FoundLoc->second;
308 }
309
310 void setExpansionLocForMacroQualifiedType(const MacroQualifiedType *MQT,
311 SourceLocation Loc) {
312 LocsForMacros[MQT] = Loc;
313 }
314
315 void setParsedNoDeref(bool parsed) { parsedNoDeref = parsed; }
316
317 bool didParseNoDeref() const { return parsedNoDeref; }
318
319 ~TypeProcessingState() {
320 if (trivial) return;
321
322 restoreDeclSpecAttrs();
323 }
324
325 private:
326 DeclSpec &getMutableDeclSpec() const {
327 return const_cast<DeclSpec&>(declarator.getDeclSpec());
328 }
329
330 void restoreDeclSpecAttrs() {
331 assert(hasSavedAttrs)((hasSavedAttrs) ? static_cast<void> (0) : __assert_fail
("hasSavedAttrs", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 331, __PRETTY_FUNCTION__))
;
332
333 getMutableDeclSpec().getAttributes().clearListOnly();
334 for (ParsedAttr *AL : savedAttrs)
335 getMutableDeclSpec().getAttributes().addAtEnd(AL);
336 }
337 };
338} // end anonymous namespace
339
340static void moveAttrFromListToList(ParsedAttr &attr,
341 ParsedAttributesView &fromList,
342 ParsedAttributesView &toList) {
343 fromList.remove(&attr);
344 toList.addAtEnd(&attr);
345}
346
347/// The location of a type attribute.
348enum TypeAttrLocation {
349 /// The attribute is in the decl-specifier-seq.
350 TAL_DeclSpec,
351 /// The attribute is part of a DeclaratorChunk.
352 TAL_DeclChunk,
353 /// The attribute is immediately after the declaration's name.
354 TAL_DeclName
355};
356
357static void processTypeAttrs(TypeProcessingState &state, QualType &type,
358 TypeAttrLocation TAL, ParsedAttributesView &attrs);
359
360static bool handleFunctionTypeAttr(TypeProcessingState &state, ParsedAttr &attr,
361 QualType &type);
362
363static bool handleMSPointerTypeQualifierAttr(TypeProcessingState &state,
364 ParsedAttr &attr, QualType &type);
365
366static bool handleObjCGCTypeAttr(TypeProcessingState &state, ParsedAttr &attr,
367 QualType &type);
368
369static bool handleObjCOwnershipTypeAttr(TypeProcessingState &state,
370 ParsedAttr &attr, QualType &type);
371
372static bool handleObjCPointerTypeAttr(TypeProcessingState &state,
373 ParsedAttr &attr, QualType &type) {
374 if (attr.getKind() == ParsedAttr::AT_ObjCGC)
375 return handleObjCGCTypeAttr(state, attr, type);
376 assert(attr.getKind() == ParsedAttr::AT_ObjCOwnership)((attr.getKind() == ParsedAttr::AT_ObjCOwnership) ? static_cast
<void> (0) : __assert_fail ("attr.getKind() == ParsedAttr::AT_ObjCOwnership"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 376, __PRETTY_FUNCTION__))
;
377 return handleObjCOwnershipTypeAttr(state, attr, type);
378}
379
380/// Given the index of a declarator chunk, check whether that chunk
381/// directly specifies the return type of a function and, if so, find
382/// an appropriate place for it.
383///
384/// \param i - a notional index which the search will start
385/// immediately inside
386///
387/// \param onlyBlockPointers Whether we should only look into block
388/// pointer types (vs. all pointer types).
389static DeclaratorChunk *maybeMovePastReturnType(Declarator &declarator,
390 unsigned i,
391 bool onlyBlockPointers) {
392 assert(i <= declarator.getNumTypeObjects())((i <= declarator.getNumTypeObjects()) ? static_cast<void
> (0) : __assert_fail ("i <= declarator.getNumTypeObjects()"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 392, __PRETTY_FUNCTION__))
;
393
394 DeclaratorChunk *result = nullptr;
395
396 // First, look inwards past parens for a function declarator.
397 for (; i != 0; --i) {
398 DeclaratorChunk &fnChunk = declarator.getTypeObject(i-1);
399 switch (fnChunk.Kind) {
400 case DeclaratorChunk::Paren:
401 continue;
402
403 // If we find anything except a function, bail out.
404 case DeclaratorChunk::Pointer:
405 case DeclaratorChunk::BlockPointer:
406 case DeclaratorChunk::Array:
407 case DeclaratorChunk::Reference:
408 case DeclaratorChunk::MemberPointer:
409 case DeclaratorChunk::Pipe:
410 return result;
411
412 // If we do find a function declarator, scan inwards from that,
413 // looking for a (block-)pointer declarator.
414 case DeclaratorChunk::Function:
415 for (--i; i != 0; --i) {
416 DeclaratorChunk &ptrChunk = declarator.getTypeObject(i-1);
417 switch (ptrChunk.Kind) {
418 case DeclaratorChunk::Paren:
419 case DeclaratorChunk::Array:
420 case DeclaratorChunk::Function:
421 case DeclaratorChunk::Reference:
422 case DeclaratorChunk::Pipe:
423 continue;
424
425 case DeclaratorChunk::MemberPointer:
426 case DeclaratorChunk::Pointer:
427 if (onlyBlockPointers)
428 continue;
429
430 LLVM_FALLTHROUGH[[gnu::fallthrough]];
431
432 case DeclaratorChunk::BlockPointer:
433 result = &ptrChunk;
434 goto continue_outer;
435 }
436 llvm_unreachable("bad declarator chunk kind")::llvm::llvm_unreachable_internal("bad declarator chunk kind"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 436)
;
437 }
438
439 // If we run out of declarators doing that, we're done.
440 return result;
441 }
442 llvm_unreachable("bad declarator chunk kind")::llvm::llvm_unreachable_internal("bad declarator chunk kind"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 442)
;
443
444 // Okay, reconsider from our new point.
445 continue_outer: ;
446 }
447
448 // Ran out of chunks, bail out.
449 return result;
450}
451
452/// Given that an objc_gc attribute was written somewhere on a
453/// declaration *other* than on the declarator itself (for which, use
454/// distributeObjCPointerTypeAttrFromDeclarator), and given that it
455/// didn't apply in whatever position it was written in, try to move
456/// it to a more appropriate position.
457static void distributeObjCPointerTypeAttr(TypeProcessingState &state,
458 ParsedAttr &attr, QualType type) {
459 Declarator &declarator = state.getDeclarator();
460
461 // Move it to the outermost normal or block pointer declarator.
462 for (unsigned i = state.getCurrentChunkIndex(); i != 0; --i) {
463 DeclaratorChunk &chunk = declarator.getTypeObject(i-1);
464 switch (chunk.Kind) {
465 case DeclaratorChunk::Pointer:
466 case DeclaratorChunk::BlockPointer: {
467 // But don't move an ARC ownership attribute to the return type
468 // of a block.
469 DeclaratorChunk *destChunk = nullptr;
470 if (state.isProcessingDeclSpec() &&
471 attr.getKind() == ParsedAttr::AT_ObjCOwnership)
472 destChunk = maybeMovePastReturnType(declarator, i - 1,
473 /*onlyBlockPointers=*/true);
474 if (!destChunk) destChunk = &chunk;
475
476 moveAttrFromListToList(attr, state.getCurrentAttributes(),
477 destChunk->getAttrs());
478 return;
479 }
480
481 case DeclaratorChunk::Paren:
482 case DeclaratorChunk::Array:
483 continue;
484
485 // We may be starting at the return type of a block.
486 case DeclaratorChunk::Function:
487 if (state.isProcessingDeclSpec() &&
488 attr.getKind() == ParsedAttr::AT_ObjCOwnership) {
489 if (DeclaratorChunk *dest = maybeMovePastReturnType(
490 declarator, i,
491 /*onlyBlockPointers=*/true)) {
492 moveAttrFromListToList(attr, state.getCurrentAttributes(),
493 dest->getAttrs());
494 return;
495 }
496 }
497 goto error;
498
499 // Don't walk through these.
500 case DeclaratorChunk::Reference:
501 case DeclaratorChunk::MemberPointer:
502 case DeclaratorChunk::Pipe:
503 goto error;
504 }
505 }
506 error:
507
508 diagnoseBadTypeAttribute(state.getSema(), attr, type);
509}
510
511/// Distribute an objc_gc type attribute that was written on the
512/// declarator.
513static void distributeObjCPointerTypeAttrFromDeclarator(
514 TypeProcessingState &state, ParsedAttr &attr, QualType &declSpecType) {
515 Declarator &declarator = state.getDeclarator();
516
517 // objc_gc goes on the innermost pointer to something that's not a
518 // pointer.
519 unsigned innermost = -1U;
520 bool considerDeclSpec = true;
521 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) {
522 DeclaratorChunk &chunk = declarator.getTypeObject(i);
523 switch (chunk.Kind) {
524 case DeclaratorChunk::Pointer:
525 case DeclaratorChunk::BlockPointer:
526 innermost = i;
527 continue;
528
529 case DeclaratorChunk::Reference:
530 case DeclaratorChunk::MemberPointer:
531 case DeclaratorChunk::Paren:
532 case DeclaratorChunk::Array:
533 case DeclaratorChunk::Pipe:
534 continue;
535
536 case DeclaratorChunk::Function:
537 considerDeclSpec = false;
538 goto done;
539 }
540 }
541 done:
542
543 // That might actually be the decl spec if we weren't blocked by
544 // anything in the declarator.
545 if (considerDeclSpec) {
546 if (handleObjCPointerTypeAttr(state, attr, declSpecType)) {
547 // Splice the attribute into the decl spec. Prevents the
548 // attribute from being applied multiple times and gives
549 // the source-location-filler something to work with.
550 state.saveDeclSpecAttrs();
551 declarator.getMutableDeclSpec().getAttributes().takeOneFrom(
552 declarator.getAttributes(), &attr);
553 return;
554 }
555 }
556
557 // Otherwise, if we found an appropriate chunk, splice the attribute
558 // into it.
559 if (innermost != -1U) {
560 moveAttrFromListToList(attr, declarator.getAttributes(),
561 declarator.getTypeObject(innermost).getAttrs());
562 return;
563 }
564
565 // Otherwise, diagnose when we're done building the type.
566 declarator.getAttributes().remove(&attr);
567 state.addIgnoredTypeAttr(attr);
568}
569
570/// A function type attribute was written somewhere in a declaration
571/// *other* than on the declarator itself or in the decl spec. Given
572/// that it didn't apply in whatever position it was written in, try
573/// to move it to a more appropriate position.
574static void distributeFunctionTypeAttr(TypeProcessingState &state,
575 ParsedAttr &attr, QualType type) {
576 Declarator &declarator = state.getDeclarator();
577
578 // Try to push the attribute from the return type of a function to
579 // the function itself.
580 for (unsigned i = state.getCurrentChunkIndex(); i != 0; --i) {
581 DeclaratorChunk &chunk = declarator.getTypeObject(i-1);
582 switch (chunk.Kind) {
583 case DeclaratorChunk::Function:
584 moveAttrFromListToList(attr, state.getCurrentAttributes(),
585 chunk.getAttrs());
586 return;
587
588 case DeclaratorChunk::Paren:
589 case DeclaratorChunk::Pointer:
590 case DeclaratorChunk::BlockPointer:
591 case DeclaratorChunk::Array:
592 case DeclaratorChunk::Reference:
593 case DeclaratorChunk::MemberPointer:
594 case DeclaratorChunk::Pipe:
595 continue;
596 }
597 }
598
599 diagnoseBadTypeAttribute(state.getSema(), attr, type);
600}
601
602/// Try to distribute a function type attribute to the innermost
603/// function chunk or type. Returns true if the attribute was
604/// distributed, false if no location was found.
605static bool distributeFunctionTypeAttrToInnermost(
606 TypeProcessingState &state, ParsedAttr &attr,
607 ParsedAttributesView &attrList, QualType &declSpecType) {
608 Declarator &declarator = state.getDeclarator();
609
610 // Put it on the innermost function chunk, if there is one.
611 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) {
612 DeclaratorChunk &chunk = declarator.getTypeObject(i);
613 if (chunk.Kind != DeclaratorChunk::Function) continue;
614
615 moveAttrFromListToList(attr, attrList, chunk.getAttrs());
616 return true;
617 }
618
619 return handleFunctionTypeAttr(state, attr, declSpecType);
620}
621
622/// A function type attribute was written in the decl spec. Try to
623/// apply it somewhere.
624static void distributeFunctionTypeAttrFromDeclSpec(TypeProcessingState &state,
625 ParsedAttr &attr,
626 QualType &declSpecType) {
627 state.saveDeclSpecAttrs();
628
629 // C++11 attributes before the decl specifiers actually appertain to
630 // the declarators. Move them straight there. We don't support the
631 // 'put them wherever you like' semantics we allow for GNU attributes.
632 if (attr.isCXX11Attribute()) {
633 moveAttrFromListToList(attr, state.getCurrentAttributes(),
634 state.getDeclarator().getAttributes());
635 return;
636 }
637
638 // Try to distribute to the innermost.
639 if (distributeFunctionTypeAttrToInnermost(
640 state, attr, state.getCurrentAttributes(), declSpecType))
641 return;
642
643 // If that failed, diagnose the bad attribute when the declarator is
644 // fully built.
645 state.addIgnoredTypeAttr(attr);
646}
647
648/// A function type attribute was written on the declarator. Try to
649/// apply it somewhere.
650static void distributeFunctionTypeAttrFromDeclarator(TypeProcessingState &state,
651 ParsedAttr &attr,
652 QualType &declSpecType) {
653 Declarator &declarator = state.getDeclarator();
654
655 // Try to distribute to the innermost.
656 if (distributeFunctionTypeAttrToInnermost(
657 state, attr, declarator.getAttributes(), declSpecType))
658 return;
659
660 // If that failed, diagnose the bad attribute when the declarator is
661 // fully built.
662 declarator.getAttributes().remove(&attr);
663 state.addIgnoredTypeAttr(attr);
664}
665
666/// Given that there are attributes written on the declarator
667/// itself, try to distribute any type attributes to the appropriate
668/// declarator chunk.
669///
670/// These are attributes like the following:
671/// int f ATTR;
672/// int (f ATTR)();
673/// but not necessarily this:
674/// int f() ATTR;
675static void distributeTypeAttrsFromDeclarator(TypeProcessingState &state,
676 QualType &declSpecType) {
677 // Collect all the type attributes from the declarator itself.
678 assert(!state.getDeclarator().getAttributes().empty() &&((!state.getDeclarator().getAttributes().empty() && "declarator has no attrs!"
) ? static_cast<void> (0) : __assert_fail ("!state.getDeclarator().getAttributes().empty() && \"declarator has no attrs!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 679, __PRETTY_FUNCTION__))
679 "declarator has no attrs!")((!state.getDeclarator().getAttributes().empty() && "declarator has no attrs!"
) ? static_cast<void> (0) : __assert_fail ("!state.getDeclarator().getAttributes().empty() && \"declarator has no attrs!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 679, __PRETTY_FUNCTION__))
;
680 // The called functions in this loop actually remove things from the current
681 // list, so iterating over the existing list isn't possible. Instead, make a
682 // non-owning copy and iterate over that.
683 ParsedAttributesView AttrsCopy{state.getDeclarator().getAttributes()};
684 for (ParsedAttr &attr : AttrsCopy) {
685 // Do not distribute C++11 attributes. They have strict rules for what
686 // they appertain to.
687 if (attr.isCXX11Attribute())
688 continue;
689
690 switch (attr.getKind()) {
691 OBJC_POINTER_TYPE_ATTRS_CASELISTcase ParsedAttr::AT_ObjCGC: case ParsedAttr::AT_ObjCOwnership:
692 distributeObjCPointerTypeAttrFromDeclarator(state, attr, declSpecType);
693 break;
694
695 FUNCTION_TYPE_ATTRS_CASELISTcase ParsedAttr::AT_NSReturnsRetained: case ParsedAttr::AT_NoReturn
: case ParsedAttr::AT_Regparm: case ParsedAttr::AT_AnyX86NoCallerSavedRegisters
: case ParsedAttr::AT_AnyX86NoCfCheck: case ParsedAttr::AT_CDecl
: case ParsedAttr::AT_FastCall: case ParsedAttr::AT_StdCall: case
ParsedAttr::AT_ThisCall: case ParsedAttr::AT_RegCall: case ParsedAttr
::AT_Pascal: case ParsedAttr::AT_SwiftCall: case ParsedAttr::
AT_VectorCall: case ParsedAttr::AT_AArch64VectorPcs: case ParsedAttr
::AT_MSABI: case ParsedAttr::AT_SysVABI: case ParsedAttr::AT_Pcs
: case ParsedAttr::AT_IntelOclBicc: case ParsedAttr::AT_PreserveMost
: case ParsedAttr::AT_PreserveAll
:
696 distributeFunctionTypeAttrFromDeclarator(state, attr, declSpecType);
697 break;
698
699 MS_TYPE_ATTRS_CASELISTcase ParsedAttr::AT_Ptr32: case ParsedAttr::AT_Ptr64: case ParsedAttr
::AT_SPtr: case ParsedAttr::AT_UPtr
:
700 // Microsoft type attributes cannot go after the declarator-id.
701 continue;
702
703 NULLABILITY_TYPE_ATTRS_CASELISTcase ParsedAttr::AT_TypeNonNull: case ParsedAttr::AT_TypeNullable
: case ParsedAttr::AT_TypeNullUnspecified
:
704 // Nullability specifiers cannot go after the declarator-id.
705
706 // Objective-C __kindof does not get distributed.
707 case ParsedAttr::AT_ObjCKindOf:
708 continue;
709
710 default:
711 break;
712 }
713 }
714}
715
716/// Add a synthetic '()' to a block-literal declarator if it is
717/// required, given the return type.
718static void maybeSynthesizeBlockSignature(TypeProcessingState &state,
719 QualType declSpecType) {
720 Declarator &declarator = state.getDeclarator();
721
722 // First, check whether the declarator would produce a function,
723 // i.e. whether the innermost semantic chunk is a function.
724 if (declarator.isFunctionDeclarator()) {
725 // If so, make that declarator a prototyped declarator.
726 declarator.getFunctionTypeInfo().hasPrototype = true;
727 return;
728 }
729
730 // If there are any type objects, the type as written won't name a
731 // function, regardless of the decl spec type. This is because a
732 // block signature declarator is always an abstract-declarator, and
733 // abstract-declarators can't just be parentheses chunks. Therefore
734 // we need to build a function chunk unless there are no type
735 // objects and the decl spec type is a function.
736 if (!declarator.getNumTypeObjects() && declSpecType->isFunctionType())
737 return;
738
739 // Note that there *are* cases with invalid declarators where
740 // declarators consist solely of parentheses. In general, these
741 // occur only in failed efforts to make function declarators, so
742 // faking up the function chunk is still the right thing to do.
743
744 // Otherwise, we need to fake up a function declarator.
745 SourceLocation loc = declarator.getBeginLoc();
746
747 // ...and *prepend* it to the declarator.
748 SourceLocation NoLoc;
749 declarator.AddInnermostTypeInfo(DeclaratorChunk::getFunction(
750 /*HasProto=*/true,
751 /*IsAmbiguous=*/false,
752 /*LParenLoc=*/NoLoc,
753 /*ArgInfo=*/nullptr,
754 /*NumParams=*/0,
755 /*EllipsisLoc=*/NoLoc,
756 /*RParenLoc=*/NoLoc,
757 /*RefQualifierIsLvalueRef=*/true,
758 /*RefQualifierLoc=*/NoLoc,
759 /*MutableLoc=*/NoLoc, EST_None,
760 /*ESpecRange=*/SourceRange(),
761 /*Exceptions=*/nullptr,
762 /*ExceptionRanges=*/nullptr,
763 /*NumExceptions=*/0,
764 /*NoexceptExpr=*/nullptr,
765 /*ExceptionSpecTokens=*/nullptr,
766 /*DeclsInPrototype=*/None, loc, loc, declarator));
767
768 // For consistency, make sure the state still has us as processing
769 // the decl spec.
770 assert(state.getCurrentChunkIndex() == declarator.getNumTypeObjects() - 1)((state.getCurrentChunkIndex() == declarator.getNumTypeObjects
() - 1) ? static_cast<void> (0) : __assert_fail ("state.getCurrentChunkIndex() == declarator.getNumTypeObjects() - 1"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 770, __PRETTY_FUNCTION__))
;
771 state.setCurrentChunkIndex(declarator.getNumTypeObjects());
772}
773
774static void diagnoseAndRemoveTypeQualifiers(Sema &S, const DeclSpec &DS,
775 unsigned &TypeQuals,
776 QualType TypeSoFar,
777 unsigned RemoveTQs,
778 unsigned DiagID) {
779 // If this occurs outside a template instantiation, warn the user about
780 // it; they probably didn't mean to specify a redundant qualifier.
781 typedef std::pair<DeclSpec::TQ, SourceLocation> QualLoc;
782 for (QualLoc Qual : {QualLoc(DeclSpec::TQ_const, DS.getConstSpecLoc()),
783 QualLoc(DeclSpec::TQ_restrict, DS.getRestrictSpecLoc()),
784 QualLoc(DeclSpec::TQ_volatile, DS.getVolatileSpecLoc()),
785 QualLoc(DeclSpec::TQ_atomic, DS.getAtomicSpecLoc())}) {
786 if (!(RemoveTQs & Qual.first))
787 continue;
788
789 if (!S.inTemplateInstantiation()) {
790 if (TypeQuals & Qual.first)
791 S.Diag(Qual.second, DiagID)
792 << DeclSpec::getSpecifierName(Qual.first) << TypeSoFar
793 << FixItHint::CreateRemoval(Qual.second);
794 }
795
796 TypeQuals &= ~Qual.first;
797 }
798}
799
800/// Return true if this is omitted block return type. Also check type
801/// attributes and type qualifiers when returning true.
802static bool checkOmittedBlockReturnType(Sema &S, Declarator &declarator,
803 QualType Result) {
804 if (!isOmittedBlockReturnType(declarator))
805 return false;
806
807 // Warn if we see type attributes for omitted return type on a block literal.
808 SmallVector<ParsedAttr *, 2> ToBeRemoved;
809 for (ParsedAttr &AL : declarator.getMutableDeclSpec().getAttributes()) {
810 if (AL.isInvalid() || !AL.isTypeAttr())
811 continue;
812 S.Diag(AL.getLoc(),
813 diag::warn_block_literal_attributes_on_omitted_return_type)
814 << AL;
815 ToBeRemoved.push_back(&AL);
816 }
817 // Remove bad attributes from the list.
818 for (ParsedAttr *AL : ToBeRemoved)
819 declarator.getMutableDeclSpec().getAttributes().remove(AL);
820
821 // Warn if we see type qualifiers for omitted return type on a block literal.
822 const DeclSpec &DS = declarator.getDeclSpec();
823 unsigned TypeQuals = DS.getTypeQualifiers();
824 diagnoseAndRemoveTypeQualifiers(S, DS, TypeQuals, Result, (unsigned)-1,
825 diag::warn_block_literal_qualifiers_on_omitted_return_type);
826 declarator.getMutableDeclSpec().ClearTypeQualifiers();
827
828 return true;
829}
830
831/// Apply Objective-C type arguments to the given type.
832static QualType applyObjCTypeArgs(Sema &S, SourceLocation loc, QualType type,
833 ArrayRef<TypeSourceInfo *> typeArgs,
834 SourceRange typeArgsRange,
835 bool failOnError = false) {
836 // We can only apply type arguments to an Objective-C class type.
837 const auto *objcObjectType = type->getAs<ObjCObjectType>();
838 if (!objcObjectType || !objcObjectType->getInterface()) {
839 S.Diag(loc, diag::err_objc_type_args_non_class)
840 << type
841 << typeArgsRange;
842
843 if (failOnError)
844 return QualType();
845 return type;
846 }
847
848 // The class type must be parameterized.
849 ObjCInterfaceDecl *objcClass = objcObjectType->getInterface();
850 ObjCTypeParamList *typeParams = objcClass->getTypeParamList();
851 if (!typeParams) {
852 S.Diag(loc, diag::err_objc_type_args_non_parameterized_class)
853 << objcClass->getDeclName()
854 << FixItHint::CreateRemoval(typeArgsRange);
855
856 if (failOnError)
857 return QualType();
858
859 return type;
860 }
861
862 // The type must not already be specialized.
863 if (objcObjectType->isSpecialized()) {
864 S.Diag(loc, diag::err_objc_type_args_specialized_class)
865 << type
866 << FixItHint::CreateRemoval(typeArgsRange);
867
868 if (failOnError)
869 return QualType();
870
871 return type;
872 }
873
874 // Check the type arguments.
875 SmallVector<QualType, 4> finalTypeArgs;
876 unsigned numTypeParams = typeParams->size();
877 bool anyPackExpansions = false;
878 for (unsigned i = 0, n = typeArgs.size(); i != n; ++i) {
879 TypeSourceInfo *typeArgInfo = typeArgs[i];
880 QualType typeArg = typeArgInfo->getType();
881
882 // Type arguments cannot have explicit qualifiers or nullability.
883 // We ignore indirect sources of these, e.g. behind typedefs or
884 // template arguments.
885 if (TypeLoc qual = typeArgInfo->getTypeLoc().findExplicitQualifierLoc()) {
886 bool diagnosed = false;
887 SourceRange rangeToRemove;
888 if (auto attr = qual.getAs<AttributedTypeLoc>()) {
889 rangeToRemove = attr.getLocalSourceRange();
890 if (attr.getTypePtr()->getImmediateNullability()) {
891 typeArg = attr.getTypePtr()->getModifiedType();
892 S.Diag(attr.getBeginLoc(),
893 diag::err_objc_type_arg_explicit_nullability)
894 << typeArg << FixItHint::CreateRemoval(rangeToRemove);
895 diagnosed = true;
896 }
897 }
898
899 if (!diagnosed) {
900 S.Diag(qual.getBeginLoc(), diag::err_objc_type_arg_qualified)
901 << typeArg << typeArg.getQualifiers().getAsString()
902 << FixItHint::CreateRemoval(rangeToRemove);
903 }
904 }
905
906 // Remove qualifiers even if they're non-local.
907 typeArg = typeArg.getUnqualifiedType();
908
909 finalTypeArgs.push_back(typeArg);
910
911 if (typeArg->getAs<PackExpansionType>())
912 anyPackExpansions = true;
913
914 // Find the corresponding type parameter, if there is one.
915 ObjCTypeParamDecl *typeParam = nullptr;
916 if (!anyPackExpansions) {
917 if (i < numTypeParams) {
918 typeParam = typeParams->begin()[i];
919 } else {
920 // Too many arguments.
921 S.Diag(loc, diag::err_objc_type_args_wrong_arity)
922 << false
923 << objcClass->getDeclName()
924 << (unsigned)typeArgs.size()
925 << numTypeParams;
926 S.Diag(objcClass->getLocation(), diag::note_previous_decl)
927 << objcClass;
928
929 if (failOnError)
930 return QualType();
931
932 return type;
933 }
934 }
935
936 // Objective-C object pointer types must be substitutable for the bounds.
937 if (const auto *typeArgObjC = typeArg->getAs<ObjCObjectPointerType>()) {
938 // If we don't have a type parameter to match against, assume
939 // everything is fine. There was a prior pack expansion that
940 // means we won't be able to match anything.
941 if (!typeParam) {
942 assert(anyPackExpansions && "Too many arguments?")((anyPackExpansions && "Too many arguments?") ? static_cast
<void> (0) : __assert_fail ("anyPackExpansions && \"Too many arguments?\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 942, __PRETTY_FUNCTION__))
;
943 continue;
944 }
945
946 // Retrieve the bound.
947 QualType bound = typeParam->getUnderlyingType();
948 const auto *boundObjC = bound->getAs<ObjCObjectPointerType>();
949
950 // Determine whether the type argument is substitutable for the bound.
951 if (typeArgObjC->isObjCIdType()) {
952 // When the type argument is 'id', the only acceptable type
953 // parameter bound is 'id'.
954 if (boundObjC->isObjCIdType())
955 continue;
956 } else if (S.Context.canAssignObjCInterfaces(boundObjC, typeArgObjC)) {
957 // Otherwise, we follow the assignability rules.
958 continue;
959 }
960
961 // Diagnose the mismatch.
962 S.Diag(typeArgInfo->getTypeLoc().getBeginLoc(),
963 diag::err_objc_type_arg_does_not_match_bound)
964 << typeArg << bound << typeParam->getDeclName();
965 S.Diag(typeParam->getLocation(), diag::note_objc_type_param_here)
966 << typeParam->getDeclName();
967
968 if (failOnError)
969 return QualType();
970
971 return type;
972 }
973
974 // Block pointer types are permitted for unqualified 'id' bounds.
975 if (typeArg->isBlockPointerType()) {
976 // If we don't have a type parameter to match against, assume
977 // everything is fine. There was a prior pack expansion that
978 // means we won't be able to match anything.
979 if (!typeParam) {
980 assert(anyPackExpansions && "Too many arguments?")((anyPackExpansions && "Too many arguments?") ? static_cast
<void> (0) : __assert_fail ("anyPackExpansions && \"Too many arguments?\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 980, __PRETTY_FUNCTION__))
;
981 continue;
982 }
983
984 // Retrieve the bound.
985 QualType bound = typeParam->getUnderlyingType();
986 if (bound->isBlockCompatibleObjCPointerType(S.Context))
987 continue;
988
989 // Diagnose the mismatch.
990 S.Diag(typeArgInfo->getTypeLoc().getBeginLoc(),
991 diag::err_objc_type_arg_does_not_match_bound)
992 << typeArg << bound << typeParam->getDeclName();
993 S.Diag(typeParam->getLocation(), diag::note_objc_type_param_here)
994 << typeParam->getDeclName();
995
996 if (failOnError)
997 return QualType();
998
999 return type;
1000 }
1001
1002 // Dependent types will be checked at instantiation time.
1003 if (typeArg->isDependentType()) {
1004 continue;
1005 }
1006
1007 // Diagnose non-id-compatible type arguments.
1008 S.Diag(typeArgInfo->getTypeLoc().getBeginLoc(),
1009 diag::err_objc_type_arg_not_id_compatible)
1010 << typeArg << typeArgInfo->getTypeLoc().getSourceRange();
1011
1012 if (failOnError)
1013 return QualType();
1014
1015 return type;
1016 }
1017
1018 // Make sure we didn't have the wrong number of arguments.
1019 if (!anyPackExpansions && finalTypeArgs.size() != numTypeParams) {
1020 S.Diag(loc, diag::err_objc_type_args_wrong_arity)
1021 << (typeArgs.size() < typeParams->size())
1022 << objcClass->getDeclName()
1023 << (unsigned)finalTypeArgs.size()
1024 << (unsigned)numTypeParams;
1025 S.Diag(objcClass->getLocation(), diag::note_previous_decl)
1026 << objcClass;
1027
1028 if (failOnError)
1029 return QualType();
1030
1031 return type;
1032 }
1033
1034 // Success. Form the specialized type.
1035 return S.Context.getObjCObjectType(type, finalTypeArgs, { }, false);
1036}
1037
1038QualType Sema::BuildObjCTypeParamType(const ObjCTypeParamDecl *Decl,
1039 SourceLocation ProtocolLAngleLoc,
1040 ArrayRef<ObjCProtocolDecl *> Protocols,
1041 ArrayRef<SourceLocation> ProtocolLocs,
1042 SourceLocation ProtocolRAngleLoc,
1043 bool FailOnError) {
1044 QualType Result = QualType(Decl->getTypeForDecl(), 0);
1045 if (!Protocols.empty()) {
1046 bool HasError;
1047 Result = Context.applyObjCProtocolQualifiers(Result, Protocols,
1048 HasError);
1049 if (HasError) {
1050 Diag(SourceLocation(), diag::err_invalid_protocol_qualifiers)
1051 << SourceRange(ProtocolLAngleLoc, ProtocolRAngleLoc);
1052 if (FailOnError) Result = QualType();
1053 }
1054 if (FailOnError && Result.isNull())
1055 return QualType();
1056 }
1057
1058 return Result;
1059}
1060
1061QualType Sema::BuildObjCObjectType(QualType BaseType,
1062 SourceLocation Loc,
1063 SourceLocation TypeArgsLAngleLoc,
1064 ArrayRef<TypeSourceInfo *> TypeArgs,
1065 SourceLocation TypeArgsRAngleLoc,
1066 SourceLocation ProtocolLAngleLoc,
1067 ArrayRef<ObjCProtocolDecl *> Protocols,
1068 ArrayRef<SourceLocation> ProtocolLocs,
1069 SourceLocation ProtocolRAngleLoc,
1070 bool FailOnError) {
1071 QualType Result = BaseType;
1072 if (!TypeArgs.empty()) {
1073 Result = applyObjCTypeArgs(*this, Loc, Result, TypeArgs,
1074 SourceRange(TypeArgsLAngleLoc,
1075 TypeArgsRAngleLoc),
1076 FailOnError);
1077 if (FailOnError && Result.isNull())
1078 return QualType();
1079 }
1080
1081 if (!Protocols.empty()) {
1082 bool HasError;
1083 Result = Context.applyObjCProtocolQualifiers(Result, Protocols,
1084 HasError);
1085 if (HasError) {
1086 Diag(Loc, diag::err_invalid_protocol_qualifiers)
1087 << SourceRange(ProtocolLAngleLoc, ProtocolRAngleLoc);
1088 if (FailOnError) Result = QualType();
1089 }
1090 if (FailOnError && Result.isNull())
1091 return QualType();
1092 }
1093
1094 return Result;
1095}
1096
1097TypeResult Sema::actOnObjCProtocolQualifierType(
1098 SourceLocation lAngleLoc,
1099 ArrayRef<Decl *> protocols,
1100 ArrayRef<SourceLocation> protocolLocs,
1101 SourceLocation rAngleLoc) {
1102 // Form id<protocol-list>.
1103 QualType Result = Context.getObjCObjectType(
1104 Context.ObjCBuiltinIdTy, { },
1105 llvm::makeArrayRef(
1106 (ObjCProtocolDecl * const *)protocols.data(),
1107 protocols.size()),
1108 false);
1109 Result = Context.getObjCObjectPointerType(Result);
1110
1111 TypeSourceInfo *ResultTInfo = Context.CreateTypeSourceInfo(Result);
1112 TypeLoc ResultTL = ResultTInfo->getTypeLoc();
1113
1114 auto ObjCObjectPointerTL = ResultTL.castAs<ObjCObjectPointerTypeLoc>();
1115 ObjCObjectPointerTL.setStarLoc(SourceLocation()); // implicit
1116
1117 auto ObjCObjectTL = ObjCObjectPointerTL.getPointeeLoc()
1118 .castAs<ObjCObjectTypeLoc>();
1119 ObjCObjectTL.setHasBaseTypeAsWritten(false);
1120 ObjCObjectTL.getBaseLoc().initialize(Context, SourceLocation());
1121
1122 // No type arguments.
1123 ObjCObjectTL.setTypeArgsLAngleLoc(SourceLocation());
1124 ObjCObjectTL.setTypeArgsRAngleLoc(SourceLocation());
1125
1126 // Fill in protocol qualifiers.
1127 ObjCObjectTL.setProtocolLAngleLoc(lAngleLoc);
1128 ObjCObjectTL.setProtocolRAngleLoc(rAngleLoc);
1129 for (unsigned i = 0, n = protocols.size(); i != n; ++i)
1130 ObjCObjectTL.setProtocolLoc(i, protocolLocs[i]);
1131
1132 // We're done. Return the completed type to the parser.
1133 return CreateParsedType(Result, ResultTInfo);
1134}
1135
1136TypeResult Sema::actOnObjCTypeArgsAndProtocolQualifiers(
1137 Scope *S,
1138 SourceLocation Loc,
1139 ParsedType BaseType,
1140 SourceLocation TypeArgsLAngleLoc,
1141 ArrayRef<ParsedType> TypeArgs,
1142 SourceLocation TypeArgsRAngleLoc,
1143 SourceLocation ProtocolLAngleLoc,
1144 ArrayRef<Decl *> Protocols,
1145 ArrayRef<SourceLocation> ProtocolLocs,
1146 SourceLocation ProtocolRAngleLoc) {
1147 TypeSourceInfo *BaseTypeInfo = nullptr;
1148 QualType T = GetTypeFromParser(BaseType, &BaseTypeInfo);
1149 if (T.isNull())
1150 return true;
1151
1152 // Handle missing type-source info.
1153 if (!BaseTypeInfo)
1154 BaseTypeInfo = Context.getTrivialTypeSourceInfo(T, Loc);
1155
1156 // Extract type arguments.
1157 SmallVector<TypeSourceInfo *, 4> ActualTypeArgInfos;
1158 for (unsigned i = 0, n = TypeArgs.size(); i != n; ++i) {
1159 TypeSourceInfo *TypeArgInfo = nullptr;
1160 QualType TypeArg = GetTypeFromParser(TypeArgs[i], &TypeArgInfo);
1161 if (TypeArg.isNull()) {
1162 ActualTypeArgInfos.clear();
1163 break;
1164 }
1165
1166 assert(TypeArgInfo && "No type source info?")((TypeArgInfo && "No type source info?") ? static_cast
<void> (0) : __assert_fail ("TypeArgInfo && \"No type source info?\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 1166, __PRETTY_FUNCTION__))
;
1167 ActualTypeArgInfos.push_back(TypeArgInfo);
1168 }
1169
1170 // Build the object type.
1171 QualType Result = BuildObjCObjectType(
1172 T, BaseTypeInfo->getTypeLoc().getSourceRange().getBegin(),
1173 TypeArgsLAngleLoc, ActualTypeArgInfos, TypeArgsRAngleLoc,
1174 ProtocolLAngleLoc,
1175 llvm::makeArrayRef((ObjCProtocolDecl * const *)Protocols.data(),
1176 Protocols.size()),
1177 ProtocolLocs, ProtocolRAngleLoc,
1178 /*FailOnError=*/false);
1179
1180 if (Result == T)
1181 return BaseType;
1182
1183 // Create source information for this type.
1184 TypeSourceInfo *ResultTInfo = Context.CreateTypeSourceInfo(Result);
1185 TypeLoc ResultTL = ResultTInfo->getTypeLoc();
1186
1187 // For id<Proto1, Proto2> or Class<Proto1, Proto2>, we'll have an
1188 // object pointer type. Fill in source information for it.
1189 if (auto ObjCObjectPointerTL = ResultTL.getAs<ObjCObjectPointerTypeLoc>()) {
1190 // The '*' is implicit.
1191 ObjCObjectPointerTL.setStarLoc(SourceLocation());
1192 ResultTL = ObjCObjectPointerTL.getPointeeLoc();
1193 }
1194
1195 if (auto OTPTL = ResultTL.getAs<ObjCTypeParamTypeLoc>()) {
1196 // Protocol qualifier information.
1197 if (OTPTL.getNumProtocols() > 0) {
1198 assert(OTPTL.getNumProtocols() == Protocols.size())((OTPTL.getNumProtocols() == Protocols.size()) ? static_cast<
void> (0) : __assert_fail ("OTPTL.getNumProtocols() == Protocols.size()"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 1198, __PRETTY_FUNCTION__))
;
1199 OTPTL.setProtocolLAngleLoc(ProtocolLAngleLoc);
1200 OTPTL.setProtocolRAngleLoc(ProtocolRAngleLoc);
1201 for (unsigned i = 0, n = Protocols.size(); i != n; ++i)
1202 OTPTL.setProtocolLoc(i, ProtocolLocs[i]);
1203 }
1204
1205 // We're done. Return the completed type to the parser.
1206 return CreateParsedType(Result, ResultTInfo);
1207 }
1208
1209 auto ObjCObjectTL = ResultTL.castAs<ObjCObjectTypeLoc>();
1210
1211 // Type argument information.
1212 if (ObjCObjectTL.getNumTypeArgs() > 0) {
1213 assert(ObjCObjectTL.getNumTypeArgs() == ActualTypeArgInfos.size())((ObjCObjectTL.getNumTypeArgs() == ActualTypeArgInfos.size())
? static_cast<void> (0) : __assert_fail ("ObjCObjectTL.getNumTypeArgs() == ActualTypeArgInfos.size()"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 1213, __PRETTY_FUNCTION__))
;
1214 ObjCObjectTL.setTypeArgsLAngleLoc(TypeArgsLAngleLoc);
1215 ObjCObjectTL.setTypeArgsRAngleLoc(TypeArgsRAngleLoc);
1216 for (unsigned i = 0, n = ActualTypeArgInfos.size(); i != n; ++i)
1217 ObjCObjectTL.setTypeArgTInfo(i, ActualTypeArgInfos[i]);
1218 } else {
1219 ObjCObjectTL.setTypeArgsLAngleLoc(SourceLocation());
1220 ObjCObjectTL.setTypeArgsRAngleLoc(SourceLocation());
1221 }
1222
1223 // Protocol qualifier information.
1224 if (ObjCObjectTL.getNumProtocols() > 0) {
1225 assert(ObjCObjectTL.getNumProtocols() == Protocols.size())((ObjCObjectTL.getNumProtocols() == Protocols.size()) ? static_cast
<void> (0) : __assert_fail ("ObjCObjectTL.getNumProtocols() == Protocols.size()"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 1225, __PRETTY_FUNCTION__))
;
1226 ObjCObjectTL.setProtocolLAngleLoc(ProtocolLAngleLoc);
1227 ObjCObjectTL.setProtocolRAngleLoc(ProtocolRAngleLoc);
1228 for (unsigned i = 0, n = Protocols.size(); i != n; ++i)
1229 ObjCObjectTL.setProtocolLoc(i, ProtocolLocs[i]);
1230 } else {
1231 ObjCObjectTL.setProtocolLAngleLoc(SourceLocation());
1232 ObjCObjectTL.setProtocolRAngleLoc(SourceLocation());
1233 }
1234
1235 // Base type.
1236 ObjCObjectTL.setHasBaseTypeAsWritten(true);
1237 if (ObjCObjectTL.getType() == T)
1238 ObjCObjectTL.getBaseLoc().initializeFullCopy(BaseTypeInfo->getTypeLoc());
1239 else
1240 ObjCObjectTL.getBaseLoc().initialize(Context, Loc);
1241
1242 // We're done. Return the completed type to the parser.
1243 return CreateParsedType(Result, ResultTInfo);
1244}
1245
1246static OpenCLAccessAttr::Spelling
1247getImageAccess(const ParsedAttributesView &Attrs) {
1248 for (const ParsedAttr &AL : Attrs)
1249 if (AL.getKind() == ParsedAttr::AT_OpenCLAccess)
1250 return static_cast<OpenCLAccessAttr::Spelling>(AL.getSemanticSpelling());
1251 return OpenCLAccessAttr::Keyword_read_only;
1252}
1253
1254/// Convert the specified declspec to the appropriate type
1255/// object.
1256/// \param state Specifies the declarator containing the declaration specifier
1257/// to be converted, along with other associated processing state.
1258/// \returns The type described by the declaration specifiers. This function
1259/// never returns null.
1260static QualType ConvertDeclSpecToType(TypeProcessingState &state) {
1261 // FIXME: Should move the logic from DeclSpec::Finish to here for validity
1262 // checking.
1263
1264 Sema &S = state.getSema();
1265 Declarator &declarator = state.getDeclarator();
1266 DeclSpec &DS = declarator.getMutableDeclSpec();
1267 SourceLocation DeclLoc = declarator.getIdentifierLoc();
1268 if (DeclLoc.isInvalid())
1
Taking false branch
1269 DeclLoc = DS.getBeginLoc();
1270
1271 ASTContext &Context = S.Context;
1272
1273 QualType Result;
1274 switch (DS.getTypeSpecType()) {
2
Control jumps to 'case 29:' at line 1585
1275 case DeclSpec::TST_void:
1276 Result = Context.VoidTy;
1277 break;
1278 case DeclSpec::TST_char:
1279 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified)
1280 Result = Context.CharTy;
1281 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed)
1282 Result = Context.SignedCharTy;
1283 else {
1284 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned &&((DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && "Unknown TSS value"
) ? static_cast<void> (0) : __assert_fail ("DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && \"Unknown TSS value\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 1285, __PRETTY_FUNCTION__))
1285 "Unknown TSS value")((DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && "Unknown TSS value"
) ? static_cast<void> (0) : __assert_fail ("DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && \"Unknown TSS value\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 1285, __PRETTY_FUNCTION__))
;
1286 Result = Context.UnsignedCharTy;
1287 }
1288 break;
1289 case DeclSpec::TST_wchar:
1290 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified)
1291 Result = Context.WCharTy;
1292 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) {
1293 S.Diag(DS.getTypeSpecSignLoc(), diag::ext_wchar_t_sign_spec)
1294 << DS.getSpecifierName(DS.getTypeSpecType(),
1295 Context.getPrintingPolicy());
1296 Result = Context.getSignedWCharType();
1297 } else {
1298 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned &&((DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && "Unknown TSS value"
) ? static_cast<void> (0) : __assert_fail ("DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && \"Unknown TSS value\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 1299, __PRETTY_FUNCTION__))
1299 "Unknown TSS value")((DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && "Unknown TSS value"
) ? static_cast<void> (0) : __assert_fail ("DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && \"Unknown TSS value\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 1299, __PRETTY_FUNCTION__))
;
1300 S.Diag(DS.getTypeSpecSignLoc(), diag::ext_wchar_t_sign_spec)
1301 << DS.getSpecifierName(DS.getTypeSpecType(),
1302 Context.getPrintingPolicy());
1303 Result = Context.getUnsignedWCharType();
1304 }
1305 break;
1306 case DeclSpec::TST_char8:
1307 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified &&((DS.getTypeSpecSign() == DeclSpec::TSS_unspecified &&
"Unknown TSS value") ? static_cast<void> (0) : __assert_fail
("DS.getTypeSpecSign() == DeclSpec::TSS_unspecified && \"Unknown TSS value\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 1308, __PRETTY_FUNCTION__))
1308 "Unknown TSS value")((DS.getTypeSpecSign() == DeclSpec::TSS_unspecified &&
"Unknown TSS value") ? static_cast<void> (0) : __assert_fail
("DS.getTypeSpecSign() == DeclSpec::TSS_unspecified && \"Unknown TSS value\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 1308, __PRETTY_FUNCTION__))
;
1309 Result = Context.Char8Ty;
1310 break;
1311 case DeclSpec::TST_char16:
1312 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified &&((DS.getTypeSpecSign() == DeclSpec::TSS_unspecified &&
"Unknown TSS value") ? static_cast<void> (0) : __assert_fail
("DS.getTypeSpecSign() == DeclSpec::TSS_unspecified && \"Unknown TSS value\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 1313, __PRETTY_FUNCTION__))
1313 "Unknown TSS value")((DS.getTypeSpecSign() == DeclSpec::TSS_unspecified &&
"Unknown TSS value") ? static_cast<void> (0) : __assert_fail
("DS.getTypeSpecSign() == DeclSpec::TSS_unspecified && \"Unknown TSS value\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 1313, __PRETTY_FUNCTION__))
;
1314 Result = Context.Char16Ty;
1315 break;
1316 case DeclSpec::TST_char32:
1317 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified &&((DS.getTypeSpecSign() == DeclSpec::TSS_unspecified &&
"Unknown TSS value") ? static_cast<void> (0) : __assert_fail
("DS.getTypeSpecSign() == DeclSpec::TSS_unspecified && \"Unknown TSS value\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 1318, __PRETTY_FUNCTION__))
1318 "Unknown TSS value")((DS.getTypeSpecSign() == DeclSpec::TSS_unspecified &&
"Unknown TSS value") ? static_cast<void> (0) : __assert_fail
("DS.getTypeSpecSign() == DeclSpec::TSS_unspecified && \"Unknown TSS value\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 1318, __PRETTY_FUNCTION__))
;
1319 Result = Context.Char32Ty;
1320 break;
1321 case DeclSpec::TST_unspecified:
1322 // If this is a missing declspec in a block literal return context, then it
1323 // is inferred from the return statements inside the block.
1324 // The declspec is always missing in a lambda expr context; it is either
1325 // specified with a trailing return type or inferred.
1326 if (S.getLangOpts().CPlusPlus14 &&
1327 declarator.getContext() == DeclaratorContext::LambdaExprContext) {
1328 // In C++1y, a lambda's implicit return type is 'auto'.
1329 Result = Context.getAutoDeductType();
1330 break;
1331 } else if (declarator.getContext() ==
1332 DeclaratorContext::LambdaExprContext ||
1333 checkOmittedBlockReturnType(S, declarator,
1334 Context.DependentTy)) {
1335 Result = Context.DependentTy;
1336 break;
1337 }
1338
1339 // Unspecified typespec defaults to int in C90. However, the C90 grammar
1340 // [C90 6.5] only allows a decl-spec if there was *some* type-specifier,
1341 // type-qualifier, or storage-class-specifier. If not, emit an extwarn.
1342 // Note that the one exception to this is function definitions, which are
1343 // allowed to be completely missing a declspec. This is handled in the
1344 // parser already though by it pretending to have seen an 'int' in this
1345 // case.
1346 if (S.getLangOpts().ImplicitInt) {
1347 // In C89 mode, we only warn if there is a completely missing declspec
1348 // when one is not allowed.
1349 if (DS.isEmpty()) {
1350 S.Diag(DeclLoc, diag::ext_missing_declspec)
1351 << DS.getSourceRange()
1352 << FixItHint::CreateInsertion(DS.getBeginLoc(), "int");
1353 }
1354 } else if (!DS.hasTypeSpecifier()) {
1355 // C99 and C++ require a type specifier. For example, C99 6.7.2p2 says:
1356 // "At least one type specifier shall be given in the declaration
1357 // specifiers in each declaration, and in the specifier-qualifier list in
1358 // each struct declaration and type name."
1359 if (S.getLangOpts().CPlusPlus && !DS.isTypeSpecPipe()) {
1360 S.Diag(DeclLoc, diag::err_missing_type_specifier)
1361 << DS.getSourceRange();
1362
1363 // When this occurs in C++ code, often something is very broken with the
1364 // value being declared, poison it as invalid so we don't get chains of
1365 // errors.
1366 declarator.setInvalidType(true);
1367 } else if ((S.getLangOpts().OpenCLVersion >= 200 ||
1368 S.getLangOpts().OpenCLCPlusPlus) &&
1369 DS.isTypeSpecPipe()) {
1370 S.Diag(DeclLoc, diag::err_missing_actual_pipe_type)
1371 << DS.getSourceRange();
1372 declarator.setInvalidType(true);
1373 } else {
1374 S.Diag(DeclLoc, diag::ext_missing_type_specifier)
1375 << DS.getSourceRange();
1376 }
1377 }
1378
1379 LLVM_FALLTHROUGH[[gnu::fallthrough]];
1380 case DeclSpec::TST_int: {
1381 if (DS.getTypeSpecSign() != DeclSpec::TSS_unsigned) {
1382 switch (DS.getTypeSpecWidth()) {
1383 case DeclSpec::TSW_unspecified: Result = Context.IntTy; break;
1384 case DeclSpec::TSW_short: Result = Context.ShortTy; break;
1385 case DeclSpec::TSW_long: Result = Context.LongTy; break;
1386 case DeclSpec::TSW_longlong:
1387 Result = Context.LongLongTy;
1388
1389 // 'long long' is a C99 or C++11 feature.
1390 if (!S.getLangOpts().C99) {
1391 if (S.getLangOpts().CPlusPlus)
1392 S.Diag(DS.getTypeSpecWidthLoc(),
1393 S.getLangOpts().CPlusPlus11 ?
1394 diag::warn_cxx98_compat_longlong : diag::ext_cxx11_longlong);
1395 else
1396 S.Diag(DS.getTypeSpecWidthLoc(), diag::ext_c99_longlong);
1397 }
1398 break;
1399 }
1400 } else {
1401 switch (DS.getTypeSpecWidth()) {
1402 case DeclSpec::TSW_unspecified: Result = Context.UnsignedIntTy; break;
1403 case DeclSpec::TSW_short: Result = Context.UnsignedShortTy; break;
1404 case DeclSpec::TSW_long: Result = Context.UnsignedLongTy; break;
1405 case DeclSpec::TSW_longlong:
1406 Result = Context.UnsignedLongLongTy;
1407
1408 // 'long long' is a C99 or C++11 feature.
1409 if (!S.getLangOpts().C99) {
1410 if (S.getLangOpts().CPlusPlus)
1411 S.Diag(DS.getTypeSpecWidthLoc(),
1412 S.getLangOpts().CPlusPlus11 ?
1413 diag::warn_cxx98_compat_longlong : diag::ext_cxx11_longlong);
1414 else
1415 S.Diag(DS.getTypeSpecWidthLoc(), diag::ext_c99_longlong);
1416 }
1417 break;
1418 }
1419 }
1420 break;
1421 }
1422 case DeclSpec::TST_accum: {
1423 switch (DS.getTypeSpecWidth()) {
1424 case DeclSpec::TSW_short:
1425 Result = Context.ShortAccumTy;
1426 break;
1427 case DeclSpec::TSW_unspecified:
1428 Result = Context.AccumTy;
1429 break;
1430 case DeclSpec::TSW_long:
1431 Result = Context.LongAccumTy;
1432 break;
1433 case DeclSpec::TSW_longlong:
1434 llvm_unreachable("Unable to specify long long as _Accum width")::llvm::llvm_unreachable_internal("Unable to specify long long as _Accum width"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 1434)
;
1435 }
1436
1437 if (DS.getTypeSpecSign() == DeclSpec::TSS_unsigned)
1438 Result = Context.getCorrespondingUnsignedType(Result);
1439
1440 if (DS.isTypeSpecSat())
1441 Result = Context.getCorrespondingSaturatedType(Result);
1442
1443 break;
1444 }
1445 case DeclSpec::TST_fract: {
1446 switch (DS.getTypeSpecWidth()) {
1447 case DeclSpec::TSW_short:
1448 Result = Context.ShortFractTy;
1449 break;
1450 case DeclSpec::TSW_unspecified:
1451 Result = Context.FractTy;
1452 break;
1453 case DeclSpec::TSW_long:
1454 Result = Context.LongFractTy;
1455 break;
1456 case DeclSpec::TSW_longlong:
1457 llvm_unreachable("Unable to specify long long as _Fract width")::llvm::llvm_unreachable_internal("Unable to specify long long as _Fract width"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 1457)
;
1458 }
1459
1460 if (DS.getTypeSpecSign() == DeclSpec::TSS_unsigned)
1461 Result = Context.getCorrespondingUnsignedType(Result);
1462
1463 if (DS.isTypeSpecSat())
1464 Result = Context.getCorrespondingSaturatedType(Result);
1465
1466 break;
1467 }
1468 case DeclSpec::TST_int128:
1469 if (!S.Context.getTargetInfo().hasInt128Type() &&
1470 !(S.getLangOpts().OpenMP && S.getLangOpts().OpenMPIsDevice))
1471 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_type_unsupported)
1472 << "__int128";
1473 if (DS.getTypeSpecSign() == DeclSpec::TSS_unsigned)
1474 Result = Context.UnsignedInt128Ty;
1475 else
1476 Result = Context.Int128Ty;
1477 break;
1478 case DeclSpec::TST_float16:
1479 // CUDA host and device may have different _Float16 support, therefore
1480 // do not diagnose _Float16 usage to avoid false alarm.
1481 // ToDo: more precise diagnostics for CUDA.
1482 if (!S.Context.getTargetInfo().hasFloat16Type() && !S.getLangOpts().CUDA &&
1483 !(S.getLangOpts().OpenMP && S.getLangOpts().OpenMPIsDevice))
1484 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_type_unsupported)
1485 << "_Float16";
1486 Result = Context.Float16Ty;
1487 break;
1488 case DeclSpec::TST_half: Result = Context.HalfTy; break;
1489 case DeclSpec::TST_float: Result = Context.FloatTy; break;
1490 case DeclSpec::TST_double:
1491 if (DS.getTypeSpecWidth() == DeclSpec::TSW_long)
1492 Result = Context.LongDoubleTy;
1493 else
1494 Result = Context.DoubleTy;
1495 break;
1496 case DeclSpec::TST_float128:
1497 if (!S.Context.getTargetInfo().hasFloat128Type() &&
1498 !(S.getLangOpts().OpenMP && S.getLangOpts().OpenMPIsDevice))
1499 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_type_unsupported)
1500 << "__float128";
1501 Result = Context.Float128Ty;
1502 break;
1503 case DeclSpec::TST_bool: Result = Context.BoolTy; break; // _Bool or bool
1504 break;
1505 case DeclSpec::TST_decimal32: // _Decimal32
1506 case DeclSpec::TST_decimal64: // _Decimal64
1507 case DeclSpec::TST_decimal128: // _Decimal128
1508 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_decimal_unsupported);
1509 Result = Context.IntTy;
1510 declarator.setInvalidType(true);
1511 break;
1512 case DeclSpec::TST_class:
1513 case DeclSpec::TST_enum:
1514 case DeclSpec::TST_union:
1515 case DeclSpec::TST_struct:
1516 case DeclSpec::TST_interface: {
1517 TagDecl *D = dyn_cast_or_null<TagDecl>(DS.getRepAsDecl());
1518 if (!D) {
1519 // This can happen in C++ with ambiguous lookups.
1520 Result = Context.IntTy;
1521 declarator.setInvalidType(true);
1522 break;
1523 }
1524
1525 // If the type is deprecated or unavailable, diagnose it.
1526 S.DiagnoseUseOfDecl(D, DS.getTypeSpecTypeNameLoc());
1527
1528 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 &&((DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex
() == 0 && DS.getTypeSpecSign() == 0 && "No qualifiers on tag names!"
) ? static_cast<void> (0) : __assert_fail ("DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && DS.getTypeSpecSign() == 0 && \"No qualifiers on tag names!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 1529, __PRETTY_FUNCTION__))
1529 DS.getTypeSpecSign() == 0 && "No qualifiers on tag names!")((DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex
() == 0 && DS.getTypeSpecSign() == 0 && "No qualifiers on tag names!"
) ? static_cast<void> (0) : __assert_fail ("DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && DS.getTypeSpecSign() == 0 && \"No qualifiers on tag names!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 1529, __PRETTY_FUNCTION__))
;
1530
1531 // TypeQuals handled by caller.
1532 Result = Context.getTypeDeclType(D);
1533
1534 // In both C and C++, make an ElaboratedType.
1535 ElaboratedTypeKeyword Keyword
1536 = ElaboratedType::getKeywordForTypeSpec(DS.getTypeSpecType());
1537 Result = S.getElaboratedType(Keyword, DS.getTypeSpecScope(), Result,
1538 DS.isTypeSpecOwned() ? D : nullptr);
1539 break;
1540 }
1541 case DeclSpec::TST_typename: {
1542 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 &&((DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex
() == 0 && DS.getTypeSpecSign() == 0 && "Can't handle qualifiers on typedef names yet!"
) ? static_cast<void> (0) : __assert_fail ("DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && DS.getTypeSpecSign() == 0 && \"Can't handle qualifiers on typedef names yet!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 1544, __PRETTY_FUNCTION__))
1543 DS.getTypeSpecSign() == 0 &&((DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex
() == 0 && DS.getTypeSpecSign() == 0 && "Can't handle qualifiers on typedef names yet!"
) ? static_cast<void> (0) : __assert_fail ("DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && DS.getTypeSpecSign() == 0 && \"Can't handle qualifiers on typedef names yet!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 1544, __PRETTY_FUNCTION__))
1544 "Can't handle qualifiers on typedef names yet!")((DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex
() == 0 && DS.getTypeSpecSign() == 0 && "Can't handle qualifiers on typedef names yet!"
) ? static_cast<void> (0) : __assert_fail ("DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && DS.getTypeSpecSign() == 0 && \"Can't handle qualifiers on typedef names yet!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 1544, __PRETTY_FUNCTION__))
;
1545 Result = S.GetTypeFromParser(DS.getRepAsType());
1546 if (Result.isNull()) {
1547 declarator.setInvalidType(true);
1548 }
1549
1550 // TypeQuals handled by caller.
1551 break;
1552 }
1553 case DeclSpec::TST_typeofType:
1554 // FIXME: Preserve type source info.
1555 Result = S.GetTypeFromParser(DS.getRepAsType());
1556 assert(!Result.isNull() && "Didn't get a type for typeof?")((!Result.isNull() && "Didn't get a type for typeof?"
) ? static_cast<void> (0) : __assert_fail ("!Result.isNull() && \"Didn't get a type for typeof?\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 1556, __PRETTY_FUNCTION__))
;
1557 if (!Result->isDependentType())
1558 if (const TagType *TT = Result->getAs<TagType>())
1559 S.DiagnoseUseOfDecl(TT->getDecl(), DS.getTypeSpecTypeLoc());
1560 // TypeQuals handled by caller.
1561 Result = Context.getTypeOfType(Result);
1562 break;
1563 case DeclSpec::TST_typeofExpr: {
1564 Expr *E = DS.getRepAsExpr();
1565 assert(E && "Didn't get an expression for typeof?")((E && "Didn't get an expression for typeof?") ? static_cast
<void> (0) : __assert_fail ("E && \"Didn't get an expression for typeof?\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 1565, __PRETTY_FUNCTION__))
;
1566 // TypeQuals handled by caller.
1567 Result = S.BuildTypeofExprType(E, DS.getTypeSpecTypeLoc());
1568 if (Result.isNull()) {
1569 Result = Context.IntTy;
1570 declarator.setInvalidType(true);
1571 }
1572 break;
1573 }
1574 case DeclSpec::TST_decltype: {
1575 Expr *E = DS.getRepAsExpr();
1576 assert(E && "Didn't get an expression for decltype?")((E && "Didn't get an expression for decltype?") ? static_cast
<void> (0) : __assert_fail ("E && \"Didn't get an expression for decltype?\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 1576, __PRETTY_FUNCTION__))
;
1577 // TypeQuals handled by caller.
1578 Result = S.BuildDecltypeType(E, DS.getTypeSpecTypeLoc());
1579 if (Result.isNull()) {
1580 Result = Context.IntTy;
1581 declarator.setInvalidType(true);
1582 }
1583 break;
1584 }
1585 case DeclSpec::TST_underlyingType:
1586 Result = S.GetTypeFromParser(DS.getRepAsType());
1587 assert(!Result.isNull() && "Didn't get a type for __underlying_type?")((!Result.isNull() && "Didn't get a type for __underlying_type?"
) ? static_cast<void> (0) : __assert_fail ("!Result.isNull() && \"Didn't get a type for __underlying_type?\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 1587, __PRETTY_FUNCTION__))
;
3
'?' condition is true
1588 Result = S.BuildUnaryTransformType(Result,
4
Calling 'Sema::BuildUnaryTransformType'
1589 UnaryTransformType::EnumUnderlyingType,
1590 DS.getTypeSpecTypeLoc());
1591 if (Result.isNull()) {
1592 Result = Context.IntTy;
1593 declarator.setInvalidType(true);
1594 }
1595 break;
1596
1597 case DeclSpec::TST_auto:
1598 Result = Context.getAutoType(QualType(), AutoTypeKeyword::Auto, false);
1599 break;
1600
1601 case DeclSpec::TST_auto_type:
1602 Result = Context.getAutoType(QualType(), AutoTypeKeyword::GNUAutoType, false);
1603 break;
1604
1605 case DeclSpec::TST_decltype_auto:
1606 Result = Context.getAutoType(QualType(), AutoTypeKeyword::DecltypeAuto,
1607 /*IsDependent*/ false);
1608 break;
1609
1610 case DeclSpec::TST_unknown_anytype:
1611 Result = Context.UnknownAnyTy;
1612 break;
1613
1614 case DeclSpec::TST_atomic:
1615 Result = S.GetTypeFromParser(DS.getRepAsType());
1616 assert(!Result.isNull() && "Didn't get a type for _Atomic?")((!Result.isNull() && "Didn't get a type for _Atomic?"
) ? static_cast<void> (0) : __assert_fail ("!Result.isNull() && \"Didn't get a type for _Atomic?\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 1616, __PRETTY_FUNCTION__))
;
1617 Result = S.BuildAtomicType(Result, DS.getTypeSpecTypeLoc());
1618 if (Result.isNull()) {
1619 Result = Context.IntTy;
1620 declarator.setInvalidType(true);
1621 }
1622 break;
1623
1624#define GENERIC_IMAGE_TYPE(ImgType, Id) \
1625 case DeclSpec::TST_##ImgType##_t: \
1626 switch (getImageAccess(DS.getAttributes())) { \
1627 case OpenCLAccessAttr::Keyword_write_only: \
1628 Result = Context.Id##WOTy; \
1629 break; \
1630 case OpenCLAccessAttr::Keyword_read_write: \
1631 Result = Context.Id##RWTy; \
1632 break; \
1633 case OpenCLAccessAttr::Keyword_read_only: \
1634 Result = Context.Id##ROTy; \
1635 break; \
1636 case OpenCLAccessAttr::SpellingNotCalculated: \
1637 llvm_unreachable("Spelling not yet calculated")::llvm::llvm_unreachable_internal("Spelling not yet calculated"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 1637)
; \
1638 } \
1639 break;
1640#include "clang/Basic/OpenCLImageTypes.def"
1641
1642 case DeclSpec::TST_error:
1643 Result = Context.IntTy;
1644 declarator.setInvalidType(true);
1645 break;
1646 }
1647
1648 if (S.getLangOpts().OpenCL &&
1649 S.checkOpenCLDisabledTypeDeclSpec(DS, Result))
1650 declarator.setInvalidType(true);
1651
1652 bool IsFixedPointType = DS.getTypeSpecType() == DeclSpec::TST_accum ||
1653 DS.getTypeSpecType() == DeclSpec::TST_fract;
1654
1655 // Only fixed point types can be saturated
1656 if (DS.isTypeSpecSat() && !IsFixedPointType)
1657 S.Diag(DS.getTypeSpecSatLoc(), diag::err_invalid_saturation_spec)
1658 << DS.getSpecifierName(DS.getTypeSpecType(),
1659 Context.getPrintingPolicy());
1660
1661 // Handle complex types.
1662 if (DS.getTypeSpecComplex() == DeclSpec::TSC_complex) {
1663 if (S.getLangOpts().Freestanding)
1664 S.Diag(DS.getTypeSpecComplexLoc(), diag::ext_freestanding_complex);
1665 Result = Context.getComplexType(Result);
1666 } else if (DS.isTypeAltiVecVector()) {
1667 unsigned typeSize = static_cast<unsigned>(Context.getTypeSize(Result));
1668 assert(typeSize > 0 && "type size for vector must be greater than 0 bits")((typeSize > 0 && "type size for vector must be greater than 0 bits"
) ? static_cast<void> (0) : __assert_fail ("typeSize > 0 && \"type size for vector must be greater than 0 bits\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 1668, __PRETTY_FUNCTION__))
;
1669 VectorType::VectorKind VecKind = VectorType::AltiVecVector;
1670 if (DS.isTypeAltiVecPixel())
1671 VecKind = VectorType::AltiVecPixel;
1672 else if (DS.isTypeAltiVecBool())
1673 VecKind = VectorType::AltiVecBool;
1674 Result = Context.getVectorType(Result, 128/typeSize, VecKind);
1675 }
1676
1677 // FIXME: Imaginary.
1678 if (DS.getTypeSpecComplex() == DeclSpec::TSC_imaginary)
1679 S.Diag(DS.getTypeSpecComplexLoc(), diag::err_imaginary_not_supported);
1680
1681 // Before we process any type attributes, synthesize a block literal
1682 // function declarator if necessary.
1683 if (declarator.getContext() == DeclaratorContext::BlockLiteralContext)
1684 maybeSynthesizeBlockSignature(state, Result);
1685
1686 // Apply any type attributes from the decl spec. This may cause the
1687 // list of type attributes to be temporarily saved while the type
1688 // attributes are pushed around.
1689 // pipe attributes will be handled later ( at GetFullTypeForDeclarator )
1690 if (!DS.isTypeSpecPipe())
1691 processTypeAttrs(state, Result, TAL_DeclSpec, DS.getAttributes());
1692
1693 // Apply const/volatile/restrict qualifiers to T.
1694 if (unsigned TypeQuals = DS.getTypeQualifiers()) {
1695 // Warn about CV qualifiers on function types.
1696 // C99 6.7.3p8:
1697 // If the specification of a function type includes any type qualifiers,
1698 // the behavior is undefined.
1699 // C++11 [dcl.fct]p7:
1700 // The effect of a cv-qualifier-seq in a function declarator is not the
1701 // same as adding cv-qualification on top of the function type. In the
1702 // latter case, the cv-qualifiers are ignored.
1703 if (TypeQuals && Result->isFunctionType()) {
1704 diagnoseAndRemoveTypeQualifiers(
1705 S, DS, TypeQuals, Result, DeclSpec::TQ_const | DeclSpec::TQ_volatile,
1706 S.getLangOpts().CPlusPlus
1707 ? diag::warn_typecheck_function_qualifiers_ignored
1708 : diag::warn_typecheck_function_qualifiers_unspecified);
1709 // No diagnostic for 'restrict' or '_Atomic' applied to a
1710 // function type; we'll diagnose those later, in BuildQualifiedType.
1711 }
1712
1713 // C++11 [dcl.ref]p1:
1714 // Cv-qualified references are ill-formed except when the
1715 // cv-qualifiers are introduced through the use of a typedef-name
1716 // or decltype-specifier, in which case the cv-qualifiers are ignored.
1717 //
1718 // There don't appear to be any other contexts in which a cv-qualified
1719 // reference type could be formed, so the 'ill-formed' clause here appears
1720 // to never happen.
1721 if (TypeQuals && Result->isReferenceType()) {
1722 diagnoseAndRemoveTypeQualifiers(
1723 S, DS, TypeQuals, Result,
1724 DeclSpec::TQ_const | DeclSpec::TQ_volatile | DeclSpec::TQ_atomic,
1725 diag::warn_typecheck_reference_qualifiers);
1726 }
1727
1728 // C90 6.5.3 constraints: "The same type qualifier shall not appear more
1729 // than once in the same specifier-list or qualifier-list, either directly
1730 // or via one or more typedefs."
1731 if (!S.getLangOpts().C99 && !S.getLangOpts().CPlusPlus
1732 && TypeQuals & Result.getCVRQualifiers()) {
1733 if (TypeQuals & DeclSpec::TQ_const && Result.isConstQualified()) {
1734 S.Diag(DS.getConstSpecLoc(), diag::ext_duplicate_declspec)
1735 << "const";
1736 }
1737
1738 if (TypeQuals & DeclSpec::TQ_volatile && Result.isVolatileQualified()) {
1739 S.Diag(DS.getVolatileSpecLoc(), diag::ext_duplicate_declspec)
1740 << "volatile";
1741 }
1742
1743 // C90 doesn't have restrict nor _Atomic, so it doesn't force us to
1744 // produce a warning in this case.
1745 }
1746
1747 QualType Qualified = S.BuildQualifiedType(Result, DeclLoc, TypeQuals, &DS);
1748
1749 // If adding qualifiers fails, just use the unqualified type.
1750 if (Qualified.isNull())
1751 declarator.setInvalidType(true);
1752 else
1753 Result = Qualified;
1754 }
1755
1756 assert(!Result.isNull() && "This function should not return a null type")((!Result.isNull() && "This function should not return a null type"
) ? static_cast<void> (0) : __assert_fail ("!Result.isNull() && \"This function should not return a null type\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 1756, __PRETTY_FUNCTION__))
;
1757 return Result;
1758}
1759
1760static std::string getPrintableNameForEntity(DeclarationName Entity) {
1761 if (Entity)
1762 return Entity.getAsString();
1763
1764 return "type name";
1765}
1766
1767QualType Sema::BuildQualifiedType(QualType T, SourceLocation Loc,
1768 Qualifiers Qs, const DeclSpec *DS) {
1769 if (T.isNull())
1770 return QualType();
1771
1772 // Ignore any attempt to form a cv-qualified reference.
1773 if (T->isReferenceType()) {
1774 Qs.removeConst();
1775 Qs.removeVolatile();
1776 }
1777
1778 // Enforce C99 6.7.3p2: "Types other than pointer types derived from
1779 // object or incomplete types shall not be restrict-qualified."
1780 if (Qs.hasRestrict()) {
1781 unsigned DiagID = 0;
1782 QualType ProblemTy;
1783
1784 if (T->isAnyPointerType() || T->isReferenceType() ||
1785 T->isMemberPointerType()) {
1786 QualType EltTy;
1787 if (T->isObjCObjectPointerType())
1788 EltTy = T;
1789 else if (const MemberPointerType *PTy = T->getAs<MemberPointerType>())
1790 EltTy = PTy->getPointeeType();
1791 else
1792 EltTy = T->getPointeeType();
1793
1794 // If we have a pointer or reference, the pointee must have an object
1795 // incomplete type.
1796 if (!EltTy->isIncompleteOrObjectType()) {
1797 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee;
1798 ProblemTy = EltTy;
1799 }
1800 } else if (!T->isDependentType()) {
1801 DiagID = diag::err_typecheck_invalid_restrict_not_pointer;
1802 ProblemTy = T;
1803 }
1804
1805 if (DiagID) {
1806 Diag(DS ? DS->getRestrictSpecLoc() : Loc, DiagID) << ProblemTy;
1807 Qs.removeRestrict();
1808 }
1809 }
1810
1811 return Context.getQualifiedType(T, Qs);
1812}
1813
1814QualType Sema::BuildQualifiedType(QualType T, SourceLocation Loc,
1815 unsigned CVRAU, const DeclSpec *DS) {
1816 if (T.isNull())
1817 return QualType();
1818
1819 // Ignore any attempt to form a cv-qualified reference.
1820 if (T->isReferenceType())
1821 CVRAU &=
1822 ~(DeclSpec::TQ_const | DeclSpec::TQ_volatile | DeclSpec::TQ_atomic);
1823
1824 // Convert from DeclSpec::TQ to Qualifiers::TQ by just dropping TQ_atomic and
1825 // TQ_unaligned;
1826 unsigned CVR = CVRAU & ~(DeclSpec::TQ_atomic | DeclSpec::TQ_unaligned);
1827
1828 // C11 6.7.3/5:
1829 // If the same qualifier appears more than once in the same
1830 // specifier-qualifier-list, either directly or via one or more typedefs,
1831 // the behavior is the same as if it appeared only once.
1832 //
1833 // It's not specified what happens when the _Atomic qualifier is applied to
1834 // a type specified with the _Atomic specifier, but we assume that this
1835 // should be treated as if the _Atomic qualifier appeared multiple times.
1836 if (CVRAU & DeclSpec::TQ_atomic && !T->isAtomicType()) {
1837 // C11 6.7.3/5:
1838 // If other qualifiers appear along with the _Atomic qualifier in a
1839 // specifier-qualifier-list, the resulting type is the so-qualified
1840 // atomic type.
1841 //
1842 // Don't need to worry about array types here, since _Atomic can't be
1843 // applied to such types.
1844 SplitQualType Split = T.getSplitUnqualifiedType();
1845 T = BuildAtomicType(QualType(Split.Ty, 0),
1846 DS ? DS->getAtomicSpecLoc() : Loc);
1847 if (T.isNull())
1848 return T;
1849 Split.Quals.addCVRQualifiers(CVR);
1850 return BuildQualifiedType(T, Loc, Split.Quals);
1851 }
1852
1853 Qualifiers Q = Qualifiers::fromCVRMask(CVR);
1854 Q.setUnaligned(CVRAU & DeclSpec::TQ_unaligned);
1855 return BuildQualifiedType(T, Loc, Q, DS);
1856}
1857
1858/// Build a paren type including \p T.
1859QualType Sema::BuildParenType(QualType T) {
1860 return Context.getParenType(T);
1861}
1862
1863/// Given that we're building a pointer or reference to the given
1864static QualType inferARCLifetimeForPointee(Sema &S, QualType type,
1865 SourceLocation loc,
1866 bool isReference) {
1867 // Bail out if retention is unrequired or already specified.
1868 if (!type->isObjCLifetimeType() ||
1869 type.getObjCLifetime() != Qualifiers::OCL_None)
1870 return type;
1871
1872 Qualifiers::ObjCLifetime implicitLifetime = Qualifiers::OCL_None;
1873
1874 // If the object type is const-qualified, we can safely use
1875 // __unsafe_unretained. This is safe (because there are no read
1876 // barriers), and it'll be safe to coerce anything but __weak* to
1877 // the resulting type.
1878 if (type.isConstQualified()) {
1879 implicitLifetime = Qualifiers::OCL_ExplicitNone;
1880
1881 // Otherwise, check whether the static type does not require
1882 // retaining. This currently only triggers for Class (possibly
1883 // protocol-qualifed, and arrays thereof).
1884 } else if (type->isObjCARCImplicitlyUnretainedType()) {
1885 implicitLifetime = Qualifiers::OCL_ExplicitNone;
1886
1887 // If we are in an unevaluated context, like sizeof, skip adding a
1888 // qualification.
1889 } else if (S.isUnevaluatedContext()) {
1890 return type;
1891
1892 // If that failed, give an error and recover using __strong. __strong
1893 // is the option most likely to prevent spurious second-order diagnostics,
1894 // like when binding a reference to a field.
1895 } else {
1896 // These types can show up in private ivars in system headers, so
1897 // we need this to not be an error in those cases. Instead we
1898 // want to delay.
1899 if (S.DelayedDiagnostics.shouldDelayDiagnostics()) {
1900 S.DelayedDiagnostics.add(
1901 sema::DelayedDiagnostic::makeForbiddenType(loc,
1902 diag::err_arc_indirect_no_ownership, type, isReference));
1903 } else {
1904 S.Diag(loc, diag::err_arc_indirect_no_ownership) << type << isReference;
1905 }
1906 implicitLifetime = Qualifiers::OCL_Strong;
1907 }
1908 assert(implicitLifetime && "didn't infer any lifetime!")((implicitLifetime && "didn't infer any lifetime!") ?
static_cast<void> (0) : __assert_fail ("implicitLifetime && \"didn't infer any lifetime!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 1908, __PRETTY_FUNCTION__))
;
1909
1910 Qualifiers qs;
1911 qs.addObjCLifetime(implicitLifetime);
1912 return S.Context.getQualifiedType(type, qs);
1913}
1914
1915static std::string getFunctionQualifiersAsString(const FunctionProtoType *FnTy){
1916 std::string Quals = FnTy->getMethodQuals().getAsString();
1917
1918 switch (FnTy->getRefQualifier()) {
1919 case RQ_None:
1920 break;
1921
1922 case RQ_LValue:
1923 if (!Quals.empty())
1924 Quals += ' ';
1925 Quals += '&';
1926 break;
1927
1928 case RQ_RValue:
1929 if (!Quals.empty())
1930 Quals += ' ';
1931 Quals += "&&";
1932 break;
1933 }
1934
1935 return Quals;
1936}
1937
1938namespace {
1939/// Kinds of declarator that cannot contain a qualified function type.
1940///
1941/// C++98 [dcl.fct]p4 / C++11 [dcl.fct]p6:
1942/// a function type with a cv-qualifier or a ref-qualifier can only appear
1943/// at the topmost level of a type.
1944///
1945/// Parens and member pointers are permitted. We don't diagnose array and
1946/// function declarators, because they don't allow function types at all.
1947///
1948/// The values of this enum are used in diagnostics.
1949enum QualifiedFunctionKind { QFK_BlockPointer, QFK_Pointer, QFK_Reference };
1950} // end anonymous namespace
1951
1952/// Check whether the type T is a qualified function type, and if it is,
1953/// diagnose that it cannot be contained within the given kind of declarator.
1954static bool checkQualifiedFunction(Sema &S, QualType T, SourceLocation Loc,
1955 QualifiedFunctionKind QFK) {
1956 // Does T refer to a function type with a cv-qualifier or a ref-qualifier?
1957 const FunctionProtoType *FPT = T->getAs<FunctionProtoType>();
1958 if (!FPT ||
1959 (FPT->getMethodQuals().empty() && FPT->getRefQualifier() == RQ_None))
1960 return false;
1961
1962 S.Diag(Loc, diag::err_compound_qualified_function_type)
1963 << QFK << isa<FunctionType>(T.IgnoreParens()) << T
1964 << getFunctionQualifiersAsString(FPT);
1965 return true;
1966}
1967
1968bool Sema::CheckQualifiedFunctionForTypeId(QualType T, SourceLocation Loc) {
1969 const FunctionProtoType *FPT = T->getAs<FunctionProtoType>();
1970 if (!FPT ||
1971 (FPT->getMethodQuals().empty() && FPT->getRefQualifier() == RQ_None))
1972 return false;
1973
1974 Diag(Loc, diag::err_qualified_function_typeid)
1975 << T << getFunctionQualifiersAsString(FPT);
1976 return true;
1977}
1978
1979// Helper to deduce addr space of a pointee type in OpenCL mode.
1980static QualType deduceOpenCLPointeeAddrSpace(Sema &S, QualType PointeeType) {
1981 if (!PointeeType->isUndeducedAutoType() && !PointeeType->isDependentType() &&
1982 !PointeeType->isSamplerT() &&
1983 !PointeeType.hasAddressSpace())
1984 PointeeType = S.getASTContext().getAddrSpaceQualType(
1985 PointeeType,
1986 S.getLangOpts().OpenCLCPlusPlus || S.getLangOpts().OpenCLVersion == 200
1987 ? LangAS::opencl_generic
1988 : LangAS::opencl_private);
1989 return PointeeType;
1990}
1991
1992/// Build a pointer type.
1993///
1994/// \param T The type to which we'll be building a pointer.
1995///
1996/// \param Loc The location of the entity whose type involves this
1997/// pointer type or, if there is no such entity, the location of the
1998/// type that will have pointer type.
1999///
2000/// \param Entity The name of the entity that involves the pointer
2001/// type, if known.
2002///
2003/// \returns A suitable pointer type, if there are no
2004/// errors. Otherwise, returns a NULL type.
2005QualType Sema::BuildPointerType(QualType T,
2006 SourceLocation Loc, DeclarationName Entity) {
2007 if (T->isReferenceType()) {
2008 // C++ 8.3.2p4: There shall be no ... pointers to references ...
2009 Diag(Loc, diag::err_illegal_decl_pointer_to_reference)
2010 << getPrintableNameForEntity(Entity) << T;
2011 return QualType();
2012 }
2013
2014 if (T->isFunctionType() && getLangOpts().OpenCL) {
2015 Diag(Loc, diag::err_opencl_function_pointer);
2016 return QualType();
2017 }
2018
2019 if (checkQualifiedFunction(*this, T, Loc, QFK_Pointer))
2020 return QualType();
2021
2022 assert(!T->isObjCObjectType() && "Should build ObjCObjectPointerType")((!T->isObjCObjectType() && "Should build ObjCObjectPointerType"
) ? static_cast<void> (0) : __assert_fail ("!T->isObjCObjectType() && \"Should build ObjCObjectPointerType\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 2022, __PRETTY_FUNCTION__))
;
2023
2024 // In ARC, it is forbidden to build pointers to unqualified pointers.
2025 if (getLangOpts().ObjCAutoRefCount)
2026 T = inferARCLifetimeForPointee(*this, T, Loc, /*reference*/ false);
2027
2028 if (getLangOpts().OpenCL)
2029 T = deduceOpenCLPointeeAddrSpace(*this, T);
2030
2031 // Build the pointer type.
2032 return Context.getPointerType(T);
2033}
2034
2035/// Build a reference type.
2036///
2037/// \param T The type to which we'll be building a reference.
2038///
2039/// \param Loc The location of the entity whose type involves this
2040/// reference type or, if there is no such entity, the location of the
2041/// type that will have reference type.
2042///
2043/// \param Entity The name of the entity that involves the reference
2044/// type, if known.
2045///
2046/// \returns A suitable reference type, if there are no
2047/// errors. Otherwise, returns a NULL type.
2048QualType Sema::BuildReferenceType(QualType T, bool SpelledAsLValue,
2049 SourceLocation Loc,
2050 DeclarationName Entity) {
2051 assert(Context.getCanonicalType(T) != Context.OverloadTy &&((Context.getCanonicalType(T) != Context.OverloadTy &&
"Unresolved overloaded function type") ? static_cast<void
> (0) : __assert_fail ("Context.getCanonicalType(T) != Context.OverloadTy && \"Unresolved overloaded function type\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 2052, __PRETTY_FUNCTION__))
2052 "Unresolved overloaded function type")((Context.getCanonicalType(T) != Context.OverloadTy &&
"Unresolved overloaded function type") ? static_cast<void
> (0) : __assert_fail ("Context.getCanonicalType(T) != Context.OverloadTy && \"Unresolved overloaded function type\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 2052, __PRETTY_FUNCTION__))
;
2053
2054 // C++0x [dcl.ref]p6:
2055 // If a typedef (7.1.3), a type template-parameter (14.3.1), or a
2056 // decltype-specifier (7.1.6.2) denotes a type TR that is a reference to a
2057 // type T, an attempt to create the type "lvalue reference to cv TR" creates
2058 // the type "lvalue reference to T", while an attempt to create the type
2059 // "rvalue reference to cv TR" creates the type TR.
2060 bool LValueRef = SpelledAsLValue || T->getAs<LValueReferenceType>();
2061
2062 // C++ [dcl.ref]p4: There shall be no references to references.
2063 //
2064 // According to C++ DR 106, references to references are only
2065 // diagnosed when they are written directly (e.g., "int & &"),
2066 // but not when they happen via a typedef:
2067 //
2068 // typedef int& intref;
2069 // typedef intref& intref2;
2070 //
2071 // Parser::ParseDeclaratorInternal diagnoses the case where
2072 // references are written directly; here, we handle the
2073 // collapsing of references-to-references as described in C++0x.
2074 // DR 106 and 540 introduce reference-collapsing into C++98/03.
2075
2076 // C++ [dcl.ref]p1:
2077 // A declarator that specifies the type "reference to cv void"
2078 // is ill-formed.
2079 if (T->isVoidType()) {
2080 Diag(Loc, diag::err_reference_to_void);
2081 return QualType();
2082 }
2083
2084 if (checkQualifiedFunction(*this, T, Loc, QFK_Reference))
2085 return QualType();
2086
2087 // In ARC, it is forbidden to build references to unqualified pointers.
2088 if (getLangOpts().ObjCAutoRefCount)
2089 T = inferARCLifetimeForPointee(*this, T, Loc, /*reference*/ true);
2090
2091 if (getLangOpts().OpenCL)
2092 T = deduceOpenCLPointeeAddrSpace(*this, T);
2093
2094 // Handle restrict on references.
2095 if (LValueRef)
2096 return Context.getLValueReferenceType(T, SpelledAsLValue);
2097 return Context.getRValueReferenceType(T);
2098}
2099
2100/// Build a Read-only Pipe type.
2101///
2102/// \param T The type to which we'll be building a Pipe.
2103///
2104/// \param Loc We do not use it for now.
2105///
2106/// \returns A suitable pipe type, if there are no errors. Otherwise, returns a
2107/// NULL type.
2108QualType Sema::BuildReadPipeType(QualType T, SourceLocation Loc) {
2109 return Context.getReadPipeType(T);
2110}
2111
2112/// Build a Write-only Pipe type.
2113///
2114/// \param T The type to which we'll be building a Pipe.
2115///
2116/// \param Loc We do not use it for now.
2117///
2118/// \returns A suitable pipe type, if there are no errors. Otherwise, returns a
2119/// NULL type.
2120QualType Sema::BuildWritePipeType(QualType T, SourceLocation Loc) {
2121 return Context.getWritePipeType(T);
2122}
2123
2124/// Check whether the specified array size makes the array type a VLA. If so,
2125/// return true, if not, return the size of the array in SizeVal.
2126static bool isArraySizeVLA(Sema &S, Expr *ArraySize, llvm::APSInt &SizeVal) {
2127 // If the size is an ICE, it certainly isn't a VLA. If we're in a GNU mode
2128 // (like gnu99, but not c99) accept any evaluatable value as an extension.
2129 class VLADiagnoser : public Sema::VerifyICEDiagnoser {
2130 public:
2131 VLADiagnoser() : Sema::VerifyICEDiagnoser(true) {}
2132
2133 void diagnoseNotICE(Sema &S, SourceLocation Loc, SourceRange SR) override {
2134 }
2135
2136 void diagnoseFold(Sema &S, SourceLocation Loc, SourceRange SR) override {
2137 S.Diag(Loc, diag::ext_vla_folded_to_constant) << SR;
2138 }
2139 } Diagnoser;
2140
2141 return S.VerifyIntegerConstantExpression(ArraySize, &SizeVal, Diagnoser,
2142 S.LangOpts.GNUMode ||
2143 S.LangOpts.OpenCL).isInvalid();
2144}
2145
2146/// Build an array type.
2147///
2148/// \param T The type of each element in the array.
2149///
2150/// \param ASM C99 array size modifier (e.g., '*', 'static').
2151///
2152/// \param ArraySize Expression describing the size of the array.
2153///
2154/// \param Brackets The range from the opening '[' to the closing ']'.
2155///
2156/// \param Entity The name of the entity that involves the array
2157/// type, if known.
2158///
2159/// \returns A suitable array type, if there are no errors. Otherwise,
2160/// returns a NULL type.
2161QualType Sema::BuildArrayType(QualType T, ArrayType::ArraySizeModifier ASM,
2162 Expr *ArraySize, unsigned Quals,
2163 SourceRange Brackets, DeclarationName Entity) {
2164
2165 SourceLocation Loc = Brackets.getBegin();
2166 if (getLangOpts().CPlusPlus) {
2167 // C++ [dcl.array]p1:
2168 // T is called the array element type; this type shall not be a reference
2169 // type, the (possibly cv-qualified) type void, a function type or an
2170 // abstract class type.
2171 //
2172 // C++ [dcl.array]p3:
2173 // When several "array of" specifications are adjacent, [...] only the
2174 // first of the constant expressions that specify the bounds of the arrays
2175 // may be omitted.
2176 //
2177 // Note: function types are handled in the common path with C.
2178 if (T->isReferenceType()) {
2179 Diag(Loc, diag::err_illegal_decl_array_of_references)
2180 << getPrintableNameForEntity(Entity) << T;
2181 return QualType();
2182 }
2183
2184 if (T->isVoidType() || T->isIncompleteArrayType()) {
2185 Diag(Loc, diag::err_illegal_decl_array_incomplete_type) << T;
2186 return QualType();
2187 }
2188
2189 if (RequireNonAbstractType(Brackets.getBegin(), T,
2190 diag::err_array_of_abstract_type))
2191 return QualType();
2192
2193 // Mentioning a member pointer type for an array type causes us to lock in
2194 // an inheritance model, even if it's inside an unused typedef.
2195 if (Context.getTargetInfo().getCXXABI().isMicrosoft())
2196 if (const MemberPointerType *MPTy = T->getAs<MemberPointerType>())
2197 if (!MPTy->getClass()->isDependentType())
2198 (void)isCompleteType(Loc, T);
2199
2200 } else {
2201 // C99 6.7.5.2p1: If the element type is an incomplete or function type,
2202 // reject it (e.g. void ary[7], struct foo ary[7], void ary[7]())
2203 if (RequireCompleteType(Loc, T,
2204 diag::err_illegal_decl_array_incomplete_type))
2205 return QualType();
2206 }
2207
2208 if (T->isFunctionType()) {
2209 Diag(Loc, diag::err_illegal_decl_array_of_functions)
2210 << getPrintableNameForEntity(Entity) << T;
2211 return QualType();
2212 }
2213
2214 if (const RecordType *EltTy = T->getAs<RecordType>()) {
2215 // If the element type is a struct or union that contains a variadic
2216 // array, accept it as a GNU extension: C99 6.7.2.1p2.
2217 if (EltTy->getDecl()->hasFlexibleArrayMember())
2218 Diag(Loc, diag::ext_flexible_array_in_array) << T;
2219 } else if (T->isObjCObjectType()) {
2220 Diag(Loc, diag::err_objc_array_of_interfaces) << T;
2221 return QualType();
2222 }
2223
2224 // Do placeholder conversions on the array size expression.
2225 if (ArraySize && ArraySize->hasPlaceholderType()) {
2226 ExprResult Result = CheckPlaceholderExpr(ArraySize);
2227 if (Result.isInvalid()) return QualType();
2228 ArraySize = Result.get();
2229 }
2230
2231 // Do lvalue-to-rvalue conversions on the array size expression.
2232 if (ArraySize && !ArraySize->isRValue()) {
2233 ExprResult Result = DefaultLvalueConversion(ArraySize);
2234 if (Result.isInvalid())
2235 return QualType();
2236
2237 ArraySize = Result.get();
2238 }
2239
2240 // C99 6.7.5.2p1: The size expression shall have integer type.
2241 // C++11 allows contextual conversions to such types.
2242 if (!getLangOpts().CPlusPlus11 &&
2243 ArraySize && !ArraySize->isTypeDependent() &&
2244 !ArraySize->getType()->isIntegralOrUnscopedEnumerationType()) {
2245 Diag(ArraySize->getBeginLoc(), diag::err_array_size_non_int)
2246 << ArraySize->getType() << ArraySize->getSourceRange();
2247 return QualType();
2248 }
2249
2250 llvm::APSInt ConstVal(Context.getTypeSize(Context.getSizeType()));
2251 if (!ArraySize) {
2252 if (ASM == ArrayType::Star)
2253 T = Context.getVariableArrayType(T, nullptr, ASM, Quals, Brackets);
2254 else
2255 T = Context.getIncompleteArrayType(T, ASM, Quals);
2256 } else if (ArraySize->isTypeDependent() || ArraySize->isValueDependent()) {
2257 T = Context.getDependentSizedArrayType(T, ArraySize, ASM, Quals, Brackets);
2258 } else if ((!T->isDependentType() && !T->isIncompleteType() &&
2259 !T->isConstantSizeType()) ||
2260 isArraySizeVLA(*this, ArraySize, ConstVal)) {
2261 // Even in C++11, don't allow contextual conversions in the array bound
2262 // of a VLA.
2263 if (getLangOpts().CPlusPlus11 &&
2264 !ArraySize->getType()->isIntegralOrUnscopedEnumerationType()) {
2265 Diag(ArraySize->getBeginLoc(), diag::err_array_size_non_int)
2266 << ArraySize->getType() << ArraySize->getSourceRange();
2267 return QualType();
2268 }
2269
2270 // C99: an array with an element type that has a non-constant-size is a VLA.
2271 // C99: an array with a non-ICE size is a VLA. We accept any expression
2272 // that we can fold to a non-zero positive value as an extension.
2273 T = Context.getVariableArrayType(T, ArraySize, ASM, Quals, Brackets);
2274 } else {
2275 // C99 6.7.5.2p1: If the expression is a constant expression, it shall
2276 // have a value greater than zero.
2277 if (ConstVal.isSigned() && ConstVal.isNegative()) {
2278 if (Entity)
2279 Diag(ArraySize->getBeginLoc(), diag::err_decl_negative_array_size)
2280 << getPrintableNameForEntity(Entity) << ArraySize->getSourceRange();
2281 else
2282 Diag(ArraySize->getBeginLoc(), diag::err_typecheck_negative_array_size)
2283 << ArraySize->getSourceRange();
2284 return QualType();
2285 }
2286 if (ConstVal == 0) {
2287 // GCC accepts zero sized static arrays. We allow them when
2288 // we're not in a SFINAE context.
2289 Diag(ArraySize->getBeginLoc(), isSFINAEContext()
2290 ? diag::err_typecheck_zero_array_size
2291 : diag::ext_typecheck_zero_array_size)
2292 << ArraySize->getSourceRange();
2293
2294 if (ASM == ArrayType::Static) {
2295 Diag(ArraySize->getBeginLoc(),
2296 diag::warn_typecheck_zero_static_array_size)
2297 << ArraySize->getSourceRange();
2298 ASM = ArrayType::Normal;
2299 }
2300 } else if (!T->isDependentType() && !T->isVariablyModifiedType() &&
2301 !T->isIncompleteType() && !T->isUndeducedType()) {
2302 // Is the array too large?
2303 unsigned ActiveSizeBits
2304 = ConstantArrayType::getNumAddressingBits(Context, T, ConstVal);
2305 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) {
2306 Diag(ArraySize->getBeginLoc(), diag::err_array_too_large)
2307 << ConstVal.toString(10) << ArraySize->getSourceRange();
2308 return QualType();
2309 }
2310 }
2311
2312 T = Context.getConstantArrayType(T, ConstVal, ArraySize, ASM, Quals);
2313 }
2314
2315 // OpenCL v1.2 s6.9.d: variable length arrays are not supported.
2316 if (getLangOpts().OpenCL && T->isVariableArrayType()) {
2317 Diag(Loc, diag::err_opencl_vla);
2318 return QualType();
2319 }
2320
2321 if (T->isVariableArrayType() && !Context.getTargetInfo().isVLASupported()) {
2322 // CUDA device code and some other targets don't support VLAs.
2323 targetDiag(Loc, (getLangOpts().CUDA && getLangOpts().CUDAIsDevice)
2324 ? diag::err_cuda_vla
2325 : diag::err_vla_unsupported)
2326 << ((getLangOpts().CUDA && getLangOpts().CUDAIsDevice)
2327 ? CurrentCUDATarget()
2328 : CFT_InvalidTarget);
2329 }
2330
2331 // If this is not C99, extwarn about VLA's and C99 array size modifiers.
2332 if (!getLangOpts().C99) {
2333 if (T->isVariableArrayType()) {
2334 // Prohibit the use of VLAs during template argument deduction.
2335 if (isSFINAEContext()) {
2336 Diag(Loc, diag::err_vla_in_sfinae);
2337 return QualType();
2338 }
2339 // Just extwarn about VLAs.
2340 else
2341 Diag(Loc, diag::ext_vla);
2342 } else if (ASM != ArrayType::Normal || Quals != 0)
2343 Diag(Loc,
2344 getLangOpts().CPlusPlus? diag::err_c99_array_usage_cxx
2345 : diag::ext_c99_array_usage) << ASM;
2346 }
2347
2348 if (T->isVariableArrayType()) {
2349 // Warn about VLAs for -Wvla.
2350 Diag(Loc, diag::warn_vla_used);
2351 }
2352
2353 // OpenCL v2.0 s6.12.5 - Arrays of blocks are not supported.
2354 // OpenCL v2.0 s6.16.13.1 - Arrays of pipe type are not supported.
2355 // OpenCL v2.0 s6.9.b - Arrays of image/sampler type are not supported.
2356 if (getLangOpts().OpenCL) {
2357 const QualType ArrType = Context.getBaseElementType(T);
2358 if (ArrType->isBlockPointerType() || ArrType->isPipeType() ||
2359 ArrType->isSamplerT() || ArrType->isImageType()) {
2360 Diag(Loc, diag::err_opencl_invalid_type_array) << ArrType;
2361 return QualType();
2362 }
2363 }
2364
2365 return T;
2366}
2367
2368QualType Sema::BuildVectorType(QualType CurType, Expr *SizeExpr,
2369 SourceLocation AttrLoc) {
2370 // The base type must be integer (not Boolean or enumeration) or float, and
2371 // can't already be a vector.
2372 if (!CurType->isDependentType() &&
2373 (!CurType->isBuiltinType() || CurType->isBooleanType() ||
2374 (!CurType->isIntegerType() && !CurType->isRealFloatingType()))) {
2375 Diag(AttrLoc, diag::err_attribute_invalid_vector_type) << CurType;
2376 return QualType();
2377 }
2378
2379 if (SizeExpr->isTypeDependent() || SizeExpr->isValueDependent())
2380 return Context.getDependentVectorType(CurType, SizeExpr, AttrLoc,
2381 VectorType::GenericVector);
2382
2383 llvm::APSInt VecSize(32);
2384 if (!SizeExpr->isIntegerConstantExpr(VecSize, Context)) {
2385 Diag(AttrLoc, diag::err_attribute_argument_type)
2386 << "vector_size" << AANT_ArgumentIntegerConstant
2387 << SizeExpr->getSourceRange();
2388 return QualType();
2389 }
2390
2391 if (CurType->isDependentType())
2392 return Context.getDependentVectorType(CurType, SizeExpr, AttrLoc,
2393 VectorType::GenericVector);
2394
2395 unsigned VectorSize = static_cast<unsigned>(VecSize.getZExtValue() * 8);
2396 unsigned TypeSize = static_cast<unsigned>(Context.getTypeSize(CurType));
2397
2398 if (VectorSize == 0) {
2399 Diag(AttrLoc, diag::err_attribute_zero_size) << SizeExpr->getSourceRange();
2400 return QualType();
2401 }
2402
2403 // vecSize is specified in bytes - convert to bits.
2404 if (VectorSize % TypeSize) {
2405 Diag(AttrLoc, diag::err_attribute_invalid_size)
2406 << SizeExpr->getSourceRange();
2407 return QualType();
2408 }
2409
2410 if (VectorType::isVectorSizeTooLarge(VectorSize / TypeSize)) {
2411 Diag(AttrLoc, diag::err_attribute_size_too_large)
2412 << SizeExpr->getSourceRange();
2413 return QualType();
2414 }
2415
2416 return Context.getVectorType(CurType, VectorSize / TypeSize,
2417 VectorType::GenericVector);
2418}
2419
2420/// Build an ext-vector type.
2421///
2422/// Run the required checks for the extended vector type.
2423QualType Sema::BuildExtVectorType(QualType T, Expr *ArraySize,
2424 SourceLocation AttrLoc) {
2425 // Unlike gcc's vector_size attribute, we do not allow vectors to be defined
2426 // in conjunction with complex types (pointers, arrays, functions, etc.).
2427 //
2428 // Additionally, OpenCL prohibits vectors of booleans (they're considered a
2429 // reserved data type under OpenCL v2.0 s6.1.4), we don't support selects
2430 // on bitvectors, and we have no well-defined ABI for bitvectors, so vectors
2431 // of bool aren't allowed.
2432 if ((!T->isDependentType() && !T->isIntegerType() &&
2433 !T->isRealFloatingType()) ||
2434 T->isBooleanType()) {
2435 Diag(AttrLoc, diag::err_attribute_invalid_vector_type) << T;
2436 return QualType();
2437 }
2438
2439 if (!ArraySize->isTypeDependent() && !ArraySize->isValueDependent()) {
2440 llvm::APSInt vecSize(32);
2441 if (!ArraySize->isIntegerConstantExpr(vecSize, Context)) {
2442 Diag(AttrLoc, diag::err_attribute_argument_type)
2443 << "ext_vector_type" << AANT_ArgumentIntegerConstant
2444 << ArraySize->getSourceRange();
2445 return QualType();
2446 }
2447
2448 // Unlike gcc's vector_size attribute, the size is specified as the
2449 // number of elements, not the number of bytes.
2450 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue());
2451
2452 if (vectorSize == 0) {
2453 Diag(AttrLoc, diag::err_attribute_zero_size)
2454 << ArraySize->getSourceRange();
2455 return QualType();
2456 }
2457
2458 if (VectorType::isVectorSizeTooLarge(vectorSize)) {
2459 Diag(AttrLoc, diag::err_attribute_size_too_large)
2460 << ArraySize->getSourceRange();
2461 return QualType();
2462 }
2463
2464 return Context.getExtVectorType(T, vectorSize);
2465 }
2466
2467 return Context.getDependentSizedExtVectorType(T, ArraySize, AttrLoc);
2468}
2469
2470bool Sema::CheckFunctionReturnType(QualType T, SourceLocation Loc) {
2471 if (T->isArrayType() || T->isFunctionType()) {
2472 Diag(Loc, diag::err_func_returning_array_function)
2473 << T->isFunctionType() << T;
2474 return true;
2475 }
2476
2477 // Functions cannot return half FP.
2478 if (T->isHalfType() && !getLangOpts().HalfArgsAndReturns) {
2479 Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 1 <<
2480 FixItHint::CreateInsertion(Loc, "*");
2481 return true;
2482 }
2483
2484 // Methods cannot return interface types. All ObjC objects are
2485 // passed by reference.
2486 if (T->isObjCObjectType()) {
2487 Diag(Loc, diag::err_object_cannot_be_passed_returned_by_value)
2488 << 0 << T << FixItHint::CreateInsertion(Loc, "*");
2489 return true;
2490 }
2491
2492 if (T.hasNonTrivialToPrimitiveDestructCUnion() ||
2493 T.hasNonTrivialToPrimitiveCopyCUnion())
2494 checkNonTrivialCUnion(T, Loc, NTCUC_FunctionReturn,
2495 NTCUK_Destruct|NTCUK_Copy);
2496
2497 // C++2a [dcl.fct]p12:
2498 // A volatile-qualified return type is deprecated
2499 if (T.isVolatileQualified() && getLangOpts().CPlusPlus2a)
2500 Diag(Loc, diag::warn_deprecated_volatile_return) << T;
2501
2502 return false;
2503}
2504
2505/// Check the extended parameter information. Most of the necessary
2506/// checking should occur when applying the parameter attribute; the
2507/// only other checks required are positional restrictions.
2508static void checkExtParameterInfos(Sema &S, ArrayRef<QualType> paramTypes,
2509 const FunctionProtoType::ExtProtoInfo &EPI,
2510 llvm::function_ref<SourceLocation(unsigned)> getParamLoc) {
2511 assert(EPI.ExtParameterInfos && "shouldn't get here without param infos")((EPI.ExtParameterInfos && "shouldn't get here without param infos"
) ? static_cast<void> (0) : __assert_fail ("EPI.ExtParameterInfos && \"shouldn't get here without param infos\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 2511, __PRETTY_FUNCTION__))
;
2512
2513 bool hasCheckedSwiftCall = false;
2514 auto checkForSwiftCC = [&](unsigned paramIndex) {
2515 // Only do this once.
2516 if (hasCheckedSwiftCall) return;
2517 hasCheckedSwiftCall = true;
2518 if (EPI.ExtInfo.getCC() == CC_Swift) return;
2519 S.Diag(getParamLoc(paramIndex), diag::err_swift_param_attr_not_swiftcall)
2520 << getParameterABISpelling(EPI.ExtParameterInfos[paramIndex].getABI());
2521 };
2522
2523 for (size_t paramIndex = 0, numParams = paramTypes.size();
2524 paramIndex != numParams; ++paramIndex) {
2525 switch (EPI.ExtParameterInfos[paramIndex].getABI()) {
2526 // Nothing interesting to check for orindary-ABI parameters.
2527 case ParameterABI::Ordinary:
2528 continue;
2529
2530 // swift_indirect_result parameters must be a prefix of the function
2531 // arguments.
2532 case ParameterABI::SwiftIndirectResult:
2533 checkForSwiftCC(paramIndex);
2534 if (paramIndex != 0 &&
2535 EPI.ExtParameterInfos[paramIndex - 1].getABI()
2536 != ParameterABI::SwiftIndirectResult) {
2537 S.Diag(getParamLoc(paramIndex),
2538 diag::err_swift_indirect_result_not_first);
2539 }
2540 continue;
2541
2542 case ParameterABI::SwiftContext:
2543 checkForSwiftCC(paramIndex);
2544 continue;
2545
2546 // swift_error parameters must be preceded by a swift_context parameter.
2547 case ParameterABI::SwiftErrorResult:
2548 checkForSwiftCC(paramIndex);
2549 if (paramIndex == 0 ||
2550 EPI.ExtParameterInfos[paramIndex - 1].getABI() !=
2551 ParameterABI::SwiftContext) {
2552 S.Diag(getParamLoc(paramIndex),
2553 diag::err_swift_error_result_not_after_swift_context);
2554 }
2555 continue;
2556 }
2557 llvm_unreachable("bad ABI kind")::llvm::llvm_unreachable_internal("bad ABI kind", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 2557)
;
2558 }
2559}
2560
2561QualType Sema::BuildFunctionType(QualType T,
2562 MutableArrayRef<QualType> ParamTypes,
2563 SourceLocation Loc, DeclarationName Entity,
2564 const FunctionProtoType::ExtProtoInfo &EPI) {
2565 bool Invalid = false;
2566
2567 Invalid |= CheckFunctionReturnType(T, Loc);
2568
2569 for (unsigned Idx = 0, Cnt = ParamTypes.size(); Idx < Cnt; ++Idx) {
2570 // FIXME: Loc is too inprecise here, should use proper locations for args.
2571 QualType ParamType = Context.getAdjustedParameterType(ParamTypes[Idx]);
2572 if (ParamType->isVoidType()) {
2573 Diag(Loc, diag::err_param_with_void_type);
2574 Invalid = true;
2575 } else if (ParamType->isHalfType() && !getLangOpts().HalfArgsAndReturns) {
2576 // Disallow half FP arguments.
2577 Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 0 <<
2578 FixItHint::CreateInsertion(Loc, "*");
2579 Invalid = true;
2580 }
2581
2582 // C++2a [dcl.fct]p4:
2583 // A parameter with volatile-qualified type is deprecated
2584 if (ParamType.isVolatileQualified() && getLangOpts().CPlusPlus2a)
2585 Diag(Loc, diag::warn_deprecated_volatile_param) << ParamType;
2586
2587 ParamTypes[Idx] = ParamType;
2588 }
2589
2590 if (EPI.ExtParameterInfos) {
2591 checkExtParameterInfos(*this, ParamTypes, EPI,
2592 [=](unsigned i) { return Loc; });
2593 }
2594
2595 if (EPI.ExtInfo.getProducesResult()) {
2596 // This is just a warning, so we can't fail to build if we see it.
2597 checkNSReturnsRetainedReturnType(Loc, T);
2598 }
2599
2600 if (Invalid)
2601 return QualType();
2602
2603 return Context.getFunctionType(T, ParamTypes, EPI);
2604}
2605
2606/// Build a member pointer type \c T Class::*.
2607///
2608/// \param T the type to which the member pointer refers.
2609/// \param Class the class type into which the member pointer points.
2610/// \param Loc the location where this type begins
2611/// \param Entity the name of the entity that will have this member pointer type
2612///
2613/// \returns a member pointer type, if successful, or a NULL type if there was
2614/// an error.
2615QualType Sema::BuildMemberPointerType(QualType T, QualType Class,
2616 SourceLocation Loc,
2617 DeclarationName Entity) {
2618 // Verify that we're not building a pointer to pointer to function with
2619 // exception specification.
2620 if (CheckDistantExceptionSpec(T)) {
2621 Diag(Loc, diag::err_distant_exception_spec);
2622 return QualType();
2623 }
2624
2625 // C++ 8.3.3p3: A pointer to member shall not point to ... a member
2626 // with reference type, or "cv void."
2627 if (T->isReferenceType()) {
2628 Diag(Loc, diag::err_illegal_decl_mempointer_to_reference)
2629 << getPrintableNameForEntity(Entity) << T;
2630 return QualType();
2631 }
2632
2633 if (T->isVoidType()) {
2634 Diag(Loc, diag::err_illegal_decl_mempointer_to_void)
2635 << getPrintableNameForEntity(Entity);
2636 return QualType();
2637 }
2638
2639 if (!Class->isDependentType() && !Class->isRecordType()) {
2640 Diag(Loc, diag::err_mempointer_in_nonclass_type) << Class;
2641 return QualType();
2642 }
2643
2644 // Adjust the default free function calling convention to the default method
2645 // calling convention.
2646 bool IsCtorOrDtor =
2647 (Entity.getNameKind() == DeclarationName::CXXConstructorName) ||
2648 (Entity.getNameKind() == DeclarationName::CXXDestructorName);
2649 if (T->isFunctionType())
2650 adjustMemberFunctionCC(T, /*IsStatic=*/false, IsCtorOrDtor, Loc);
2651
2652 return Context.getMemberPointerType(T, Class.getTypePtr());
2653}
2654
2655/// Build a block pointer type.
2656///
2657/// \param T The type to which we'll be building a block pointer.
2658///
2659/// \param Loc The source location, used for diagnostics.
2660///
2661/// \param Entity The name of the entity that involves the block pointer
2662/// type, if known.
2663///
2664/// \returns A suitable block pointer type, if there are no
2665/// errors. Otherwise, returns a NULL type.
2666QualType Sema::BuildBlockPointerType(QualType T,
2667 SourceLocation Loc,
2668 DeclarationName Entity) {
2669 if (!T->isFunctionType()) {
2670 Diag(Loc, diag::err_nonfunction_block_type);
2671 return QualType();
2672 }
2673
2674 if (checkQualifiedFunction(*this, T, Loc, QFK_BlockPointer))
2675 return QualType();
2676
2677 if (getLangOpts().OpenCL)
2678 T = deduceOpenCLPointeeAddrSpace(*this, T);
2679
2680 return Context.getBlockPointerType(T);
2681}
2682
2683QualType Sema::GetTypeFromParser(ParsedType Ty, TypeSourceInfo **TInfo) {
2684 QualType QT = Ty.get();
2685 if (QT.isNull()) {
2686 if (TInfo) *TInfo = nullptr;
2687 return QualType();
2688 }
2689
2690 TypeSourceInfo *DI = nullptr;
2691 if (const LocInfoType *LIT = dyn_cast<LocInfoType>(QT)) {
2692 QT = LIT->getType();
2693 DI = LIT->getTypeSourceInfo();
2694 }
2695
2696 if (TInfo) *TInfo = DI;
2697 return QT;
2698}
2699
2700static void transferARCOwnershipToDeclaratorChunk(TypeProcessingState &state,
2701 Qualifiers::ObjCLifetime ownership,
2702 unsigned chunkIndex);
2703
2704/// Given that this is the declaration of a parameter under ARC,
2705/// attempt to infer attributes and such for pointer-to-whatever
2706/// types.
2707static void inferARCWriteback(TypeProcessingState &state,
2708 QualType &declSpecType) {
2709 Sema &S = state.getSema();
2710 Declarator &declarator = state.getDeclarator();
2711
2712 // TODO: should we care about decl qualifiers?
2713
2714 // Check whether the declarator has the expected form. We walk
2715 // from the inside out in order to make the block logic work.
2716 unsigned outermostPointerIndex = 0;
2717 bool isBlockPointer = false;
2718 unsigned numPointers = 0;
2719 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) {
2720 unsigned chunkIndex = i;
2721 DeclaratorChunk &chunk = declarator.getTypeObject(chunkIndex);
2722 switch (chunk.Kind) {
2723 case DeclaratorChunk::Paren:
2724 // Ignore parens.
2725 break;
2726
2727 case DeclaratorChunk::Reference:
2728 case DeclaratorChunk::Pointer:
2729 // Count the number of pointers. Treat references
2730 // interchangeably as pointers; if they're mis-ordered, normal
2731 // type building will discover that.
2732 outermostPointerIndex = chunkIndex;
2733 numPointers++;
2734 break;
2735
2736 case DeclaratorChunk::BlockPointer:
2737 // If we have a pointer to block pointer, that's an acceptable
2738 // indirect reference; anything else is not an application of
2739 // the rules.
2740 if (numPointers != 1) return;
2741 numPointers++;
2742 outermostPointerIndex = chunkIndex;
2743 isBlockPointer = true;
2744
2745 // We don't care about pointer structure in return values here.
2746 goto done;
2747
2748 case DeclaratorChunk::Array: // suppress if written (id[])?
2749 case DeclaratorChunk::Function:
2750 case DeclaratorChunk::MemberPointer:
2751 case DeclaratorChunk::Pipe:
2752 return;
2753 }
2754 }
2755 done:
2756
2757 // If we have *one* pointer, then we want to throw the qualifier on
2758 // the declaration-specifiers, which means that it needs to be a
2759 // retainable object type.
2760 if (numPointers == 1) {
2761 // If it's not a retainable object type, the rule doesn't apply.
2762 if (!declSpecType->isObjCRetainableType()) return;
2763
2764 // If it already has lifetime, don't do anything.
2765 if (declSpecType.getObjCLifetime()) return;
2766
2767 // Otherwise, modify the type in-place.
2768 Qualifiers qs;
2769
2770 if (declSpecType->isObjCARCImplicitlyUnretainedType())
2771 qs.addObjCLifetime(Qualifiers::OCL_ExplicitNone);
2772 else
2773 qs.addObjCLifetime(Qualifiers::OCL_Autoreleasing);
2774 declSpecType = S.Context.getQualifiedType(declSpecType, qs);
2775
2776 // If we have *two* pointers, then we want to throw the qualifier on
2777 // the outermost pointer.
2778 } else if (numPointers == 2) {
2779 // If we don't have a block pointer, we need to check whether the
2780 // declaration-specifiers gave us something that will turn into a
2781 // retainable object pointer after we slap the first pointer on it.
2782 if (!isBlockPointer && !declSpecType->isObjCObjectType())
2783 return;
2784
2785 // Look for an explicit lifetime attribute there.
2786 DeclaratorChunk &chunk = declarator.getTypeObject(outermostPointerIndex);
2787 if (chunk.Kind != DeclaratorChunk::Pointer &&
2788 chunk.Kind != DeclaratorChunk::BlockPointer)
2789 return;
2790 for (const ParsedAttr &AL : chunk.getAttrs())
2791 if (AL.getKind() == ParsedAttr::AT_ObjCOwnership)
2792 return;
2793
2794 transferARCOwnershipToDeclaratorChunk(state, Qualifiers::OCL_Autoreleasing,
2795 outermostPointerIndex);
2796
2797 // Any other number of pointers/references does not trigger the rule.
2798 } else return;
2799
2800 // TODO: mark whether we did this inference?
2801}
2802
2803void Sema::diagnoseIgnoredQualifiers(unsigned DiagID, unsigned Quals,
2804 SourceLocation FallbackLoc,
2805 SourceLocation ConstQualLoc,
2806 SourceLocation VolatileQualLoc,
2807 SourceLocation RestrictQualLoc,
2808 SourceLocation AtomicQualLoc,
2809 SourceLocation UnalignedQualLoc) {
2810 if (!Quals)
2811 return;
2812
2813 struct Qual {
2814 const char *Name;
2815 unsigned Mask;
2816 SourceLocation Loc;
2817 } const QualKinds[5] = {
2818 { "const", DeclSpec::TQ_const, ConstQualLoc },
2819 { "volatile", DeclSpec::TQ_volatile, VolatileQualLoc },
2820 { "restrict", DeclSpec::TQ_restrict, RestrictQualLoc },
2821 { "__unaligned", DeclSpec::TQ_unaligned, UnalignedQualLoc },
2822 { "_Atomic", DeclSpec::TQ_atomic, AtomicQualLoc }
2823 };
2824
2825 SmallString<32> QualStr;
2826 unsigned NumQuals = 0;
2827 SourceLocation Loc;
2828 FixItHint FixIts[5];
2829
2830 // Build a string naming the redundant qualifiers.
2831 for (auto &E : QualKinds) {
2832 if (Quals & E.Mask) {
2833 if (!QualStr.empty()) QualStr += ' ';
2834 QualStr += E.Name;
2835
2836 // If we have a location for the qualifier, offer a fixit.
2837 SourceLocation QualLoc = E.Loc;
2838 if (QualLoc.isValid()) {
2839 FixIts[NumQuals] = FixItHint::CreateRemoval(QualLoc);
2840 if (Loc.isInvalid() ||
2841 getSourceManager().isBeforeInTranslationUnit(QualLoc, Loc))
2842 Loc = QualLoc;
2843 }
2844
2845 ++NumQuals;
2846 }
2847 }
2848
2849 Diag(Loc.isInvalid() ? FallbackLoc : Loc, DiagID)
2850 << QualStr << NumQuals << FixIts[0] << FixIts[1] << FixIts[2] << FixIts[3];
2851}
2852
2853// Diagnose pointless type qualifiers on the return type of a function.
2854static void diagnoseRedundantReturnTypeQualifiers(Sema &S, QualType RetTy,
2855 Declarator &D,
2856 unsigned FunctionChunkIndex) {
2857 if (D.getTypeObject(FunctionChunkIndex).Fun.hasTrailingReturnType()) {
2858 // FIXME: TypeSourceInfo doesn't preserve location information for
2859 // qualifiers.
2860 S.diagnoseIgnoredQualifiers(diag::warn_qual_return_type,
2861 RetTy.getLocalCVRQualifiers(),
2862 D.getIdentifierLoc());
2863 return;
2864 }
2865
2866 for (unsigned OuterChunkIndex = FunctionChunkIndex + 1,
2867 End = D.getNumTypeObjects();
2868 OuterChunkIndex != End; ++OuterChunkIndex) {
2869 DeclaratorChunk &OuterChunk = D.getTypeObject(OuterChunkIndex);
2870 switch (OuterChunk.Kind) {
2871 case DeclaratorChunk::Paren:
2872 continue;
2873
2874 case DeclaratorChunk::Pointer: {
2875 DeclaratorChunk::PointerTypeInfo &PTI = OuterChunk.Ptr;
2876 S.diagnoseIgnoredQualifiers(
2877 diag::warn_qual_return_type,
2878 PTI.TypeQuals,
2879 SourceLocation(),
2880 SourceLocation::getFromRawEncoding(PTI.ConstQualLoc),
2881 SourceLocation::getFromRawEncoding(PTI.VolatileQualLoc),
2882 SourceLocation::getFromRawEncoding(PTI.RestrictQualLoc),
2883 SourceLocation::getFromRawEncoding(PTI.AtomicQualLoc),
2884 SourceLocation::getFromRawEncoding(PTI.UnalignedQualLoc));
2885 return;
2886 }
2887
2888 case DeclaratorChunk::Function:
2889 case DeclaratorChunk::BlockPointer:
2890 case DeclaratorChunk::Reference:
2891 case DeclaratorChunk::Array:
2892 case DeclaratorChunk::MemberPointer:
2893 case DeclaratorChunk::Pipe:
2894 // FIXME: We can't currently provide an accurate source location and a
2895 // fix-it hint for these.
2896 unsigned AtomicQual = RetTy->isAtomicType() ? DeclSpec::TQ_atomic : 0;
2897 S.diagnoseIgnoredQualifiers(diag::warn_qual_return_type,
2898 RetTy.getCVRQualifiers() | AtomicQual,
2899 D.getIdentifierLoc());
2900 return;
2901 }
2902
2903 llvm_unreachable("unknown declarator chunk kind")::llvm::llvm_unreachable_internal("unknown declarator chunk kind"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 2903)
;
2904 }
2905
2906 // If the qualifiers come from a conversion function type, don't diagnose
2907 // them -- they're not necessarily redundant, since such a conversion
2908 // operator can be explicitly called as "x.operator const int()".
2909 if (D.getName().getKind() == UnqualifiedIdKind::IK_ConversionFunctionId)
2910 return;
2911
2912 // Just parens all the way out to the decl specifiers. Diagnose any qualifiers
2913 // which are present there.
2914 S.diagnoseIgnoredQualifiers(diag::warn_qual_return_type,
2915 D.getDeclSpec().getTypeQualifiers(),
2916 D.getIdentifierLoc(),
2917 D.getDeclSpec().getConstSpecLoc(),
2918 D.getDeclSpec().getVolatileSpecLoc(),
2919 D.getDeclSpec().getRestrictSpecLoc(),
2920 D.getDeclSpec().getAtomicSpecLoc(),
2921 D.getDeclSpec().getUnalignedSpecLoc());
2922}
2923
2924static QualType GetDeclSpecTypeForDeclarator(TypeProcessingState &state,
2925 TypeSourceInfo *&ReturnTypeInfo) {
2926 Sema &SemaRef = state.getSema();
2927 Declarator &D = state.getDeclarator();
2928 QualType T;
2929 ReturnTypeInfo = nullptr;
2930
2931 // The TagDecl owned by the DeclSpec.
2932 TagDecl *OwnedTagDecl = nullptr;
2933
2934 switch (D.getName().getKind()) {
2935 case UnqualifiedIdKind::IK_ImplicitSelfParam:
2936 case UnqualifiedIdKind::IK_OperatorFunctionId:
2937 case UnqualifiedIdKind::IK_Identifier:
2938 case UnqualifiedIdKind::IK_LiteralOperatorId:
2939 case UnqualifiedIdKind::IK_TemplateId:
2940 T = ConvertDeclSpecToType(state);
2941
2942 if (!D.isInvalidType() && D.getDeclSpec().isTypeSpecOwned()) {
2943 OwnedTagDecl = cast<TagDecl>(D.getDeclSpec().getRepAsDecl());
2944 // Owned declaration is embedded in declarator.
2945 OwnedTagDecl->setEmbeddedInDeclarator(true);
2946 }
2947 break;
2948
2949 case UnqualifiedIdKind::IK_ConstructorName:
2950 case UnqualifiedIdKind::IK_ConstructorTemplateId:
2951 case UnqualifiedIdKind::IK_DestructorName:
2952 // Constructors and destructors don't have return types. Use
2953 // "void" instead.
2954 T = SemaRef.Context.VoidTy;
2955 processTypeAttrs(state, T, TAL_DeclSpec,
2956 D.getMutableDeclSpec().getAttributes());
2957 break;
2958
2959 case UnqualifiedIdKind::IK_DeductionGuideName:
2960 // Deduction guides have a trailing return type and no type in their
2961 // decl-specifier sequence. Use a placeholder return type for now.
2962 T = SemaRef.Context.DependentTy;
2963 break;
2964
2965 case UnqualifiedIdKind::IK_ConversionFunctionId:
2966 // The result type of a conversion function is the type that it
2967 // converts to.
2968 T = SemaRef.GetTypeFromParser(D.getName().ConversionFunctionId,
2969 &ReturnTypeInfo);
2970 break;
2971 }
2972
2973 if (!D.getAttributes().empty())
2974 distributeTypeAttrsFromDeclarator(state, T);
2975
2976 // C++11 [dcl.spec.auto]p5: reject 'auto' if it is not in an allowed context.
2977 if (DeducedType *Deduced = T->getContainedDeducedType()) {
2978 AutoType *Auto = dyn_cast<AutoType>(Deduced);
2979 int Error = -1;
2980
2981 // Is this a 'auto' or 'decltype(auto)' type (as opposed to __auto_type or
2982 // class template argument deduction)?
2983 bool IsCXXAutoType =
2984 (Auto && Auto->getKeyword() != AutoTypeKeyword::GNUAutoType);
2985 bool IsDeducedReturnType = false;
2986
2987 switch (D.getContext()) {
2988 case DeclaratorContext::LambdaExprContext:
2989 // Declared return type of a lambda-declarator is implicit and is always
2990 // 'auto'.
2991 break;
2992 case DeclaratorContext::ObjCParameterContext:
2993 case DeclaratorContext::ObjCResultContext:
2994 case DeclaratorContext::PrototypeContext:
2995 Error = 0;
2996 break;
2997 case DeclaratorContext::LambdaExprParameterContext:
2998 // In C++14, generic lambdas allow 'auto' in their parameters.
2999 if (!SemaRef.getLangOpts().CPlusPlus14 ||
3000 !Auto || Auto->getKeyword() != AutoTypeKeyword::Auto)
3001 Error = 16;
3002 else {
3003 // If auto is mentioned in a lambda parameter context, convert it to a
3004 // template parameter type.
3005 sema::LambdaScopeInfo *LSI = SemaRef.getCurLambda();
3006 assert(LSI && "No LambdaScopeInfo on the stack!")((LSI && "No LambdaScopeInfo on the stack!") ? static_cast
<void> (0) : __assert_fail ("LSI && \"No LambdaScopeInfo on the stack!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 3006, __PRETTY_FUNCTION__))
;
3007 const unsigned TemplateParameterDepth = LSI->AutoTemplateParameterDepth;
3008 const unsigned AutoParameterPosition = LSI->TemplateParams.size();
3009 const bool IsParameterPack = D.hasEllipsis();
3010
3011 // Create the TemplateTypeParmDecl here to retrieve the corresponding
3012 // template parameter type. Template parameters are temporarily added
3013 // to the TU until the associated TemplateDecl is created.
3014 TemplateTypeParmDecl *CorrespondingTemplateParam =
3015 TemplateTypeParmDecl::Create(
3016 SemaRef.Context, SemaRef.Context.getTranslationUnitDecl(),
3017 /*KeyLoc*/ SourceLocation(), /*NameLoc*/ D.getBeginLoc(),
3018 TemplateParameterDepth, AutoParameterPosition,
3019 /*Identifier*/ nullptr, false, IsParameterPack);
3020 CorrespondingTemplateParam->setImplicit();
3021 LSI->TemplateParams.push_back(CorrespondingTemplateParam);
3022 // Replace the 'auto' in the function parameter with this invented
3023 // template type parameter.
3024 // FIXME: Retain some type sugar to indicate that this was written
3025 // as 'auto'.
3026 T = state.ReplaceAutoType(
3027 T, QualType(CorrespondingTemplateParam->getTypeForDecl(), 0));
3028 }
3029 break;
3030 case DeclaratorContext::MemberContext: {
3031 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static ||
3032 D.isFunctionDeclarator())
3033 break;
3034 bool Cxx = SemaRef.getLangOpts().CPlusPlus;
3035 switch (cast<TagDecl>(SemaRef.CurContext)->getTagKind()) {
3036 case TTK_Enum: llvm_unreachable("unhandled tag kind")::llvm::llvm_unreachable_internal("unhandled tag kind", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 3036)
;
3037 case TTK_Struct: Error = Cxx ? 1 : 2; /* Struct member */ break;
3038 case TTK_Union: Error = Cxx ? 3 : 4; /* Union member */ break;
3039 case TTK_Class: Error = 5; /* Class member */ break;
3040 case TTK_Interface: Error = 6; /* Interface member */ break;
3041 }
3042 if (D.getDeclSpec().isFriendSpecified())
3043 Error = 20; // Friend type
3044 break;
3045 }
3046 case DeclaratorContext::CXXCatchContext:
3047 case DeclaratorContext::ObjCCatchContext:
3048 Error = 7; // Exception declaration
3049 break;
3050 case DeclaratorContext::TemplateParamContext:
3051 if (isa<DeducedTemplateSpecializationType>(Deduced))
3052 Error = 19; // Template parameter
3053 else if (!SemaRef.getLangOpts().CPlusPlus17)
3054 Error = 8; // Template parameter (until C++17)
3055 break;
3056 case DeclaratorContext::BlockLiteralContext:
3057 Error = 9; // Block literal
3058 break;
3059 case DeclaratorContext::TemplateArgContext:
3060 // Within a template argument list, a deduced template specialization
3061 // type will be reinterpreted as a template template argument.
3062 if (isa<DeducedTemplateSpecializationType>(Deduced) &&
3063 !D.getNumTypeObjects() &&
3064 D.getDeclSpec().getParsedSpecifiers() == DeclSpec::PQ_TypeSpecifier)
3065 break;
3066 LLVM_FALLTHROUGH[[gnu::fallthrough]];
3067 case DeclaratorContext::TemplateTypeArgContext:
3068 Error = 10; // Template type argument
3069 break;
3070 case DeclaratorContext::AliasDeclContext:
3071 case DeclaratorContext::AliasTemplateContext:
3072 Error = 12; // Type alias
3073 break;
3074 case DeclaratorContext::TrailingReturnContext:
3075 case DeclaratorContext::TrailingReturnVarContext:
3076 if (!SemaRef.getLangOpts().CPlusPlus14 || !IsCXXAutoType)
3077 Error = 13; // Function return type
3078 IsDeducedReturnType = true;
3079 break;
3080 case DeclaratorContext::ConversionIdContext:
3081 if (!SemaRef.getLangOpts().CPlusPlus14 || !IsCXXAutoType)
3082 Error = 14; // conversion-type-id
3083 IsDeducedReturnType = true;
3084 break;
3085 case DeclaratorContext::FunctionalCastContext:
3086 if (isa<DeducedTemplateSpecializationType>(Deduced))
3087 break;
3088 LLVM_FALLTHROUGH[[gnu::fallthrough]];
3089 case DeclaratorContext::TypeNameContext:
3090 Error = 15; // Generic
3091 break;
3092 case DeclaratorContext::FileContext:
3093 case DeclaratorContext::BlockContext:
3094 case DeclaratorContext::ForContext:
3095 case DeclaratorContext::InitStmtContext:
3096 case DeclaratorContext::ConditionContext:
3097 // FIXME: P0091R3 (erroneously) does not permit class template argument
3098 // deduction in conditions, for-init-statements, and other declarations
3099 // that are not simple-declarations.
3100 break;
3101 case DeclaratorContext::CXXNewContext:
3102 // FIXME: P0091R3 does not permit class template argument deduction here,
3103 // but we follow GCC and allow it anyway.
3104 if (!IsCXXAutoType && !isa<DeducedTemplateSpecializationType>(Deduced))
3105 Error = 17; // 'new' type
3106 break;
3107 case DeclaratorContext::KNRTypeListContext:
3108 Error = 18; // K&R function parameter
3109 break;
3110 }
3111
3112 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef)
3113 Error = 11;
3114
3115 // In Objective-C it is an error to use 'auto' on a function declarator
3116 // (and everywhere for '__auto_type').
3117 if (D.isFunctionDeclarator() &&
3118 (!SemaRef.getLangOpts().CPlusPlus11 || !IsCXXAutoType))
3119 Error = 13;
3120
3121 bool HaveTrailing = false;
3122
3123 // C++11 [dcl.spec.auto]p2: 'auto' is always fine if the declarator
3124 // contains a trailing return type. That is only legal at the outermost
3125 // level. Check all declarator chunks (outermost first) anyway, to give
3126 // better diagnostics.
3127 // We don't support '__auto_type' with trailing return types.
3128 // FIXME: Should we only do this for 'auto' and not 'decltype(auto)'?
3129 if (SemaRef.getLangOpts().CPlusPlus11 && IsCXXAutoType &&
3130 D.hasTrailingReturnType()) {
3131 HaveTrailing = true;
3132 Error = -1;
3133 }
3134
3135 SourceRange AutoRange = D.getDeclSpec().getTypeSpecTypeLoc();
3136 if (D.getName().getKind() == UnqualifiedIdKind::IK_ConversionFunctionId)
3137 AutoRange = D.getName().getSourceRange();
3138
3139 if (Error != -1) {
3140 unsigned Kind;
3141 if (Auto) {
3142 switch (Auto->getKeyword()) {
3143 case AutoTypeKeyword::Auto: Kind = 0; break;
3144 case AutoTypeKeyword::DecltypeAuto: Kind = 1; break;
3145 case AutoTypeKeyword::GNUAutoType: Kind = 2; break;
3146 }
3147 } else {
3148 assert(isa<DeducedTemplateSpecializationType>(Deduced) &&((isa<DeducedTemplateSpecializationType>(Deduced) &&
"unknown auto type") ? static_cast<void> (0) : __assert_fail
("isa<DeducedTemplateSpecializationType>(Deduced) && \"unknown auto type\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 3149, __PRETTY_FUNCTION__))
3149 "unknown auto type")((isa<DeducedTemplateSpecializationType>(Deduced) &&
"unknown auto type") ? static_cast<void> (0) : __assert_fail
("isa<DeducedTemplateSpecializationType>(Deduced) && \"unknown auto type\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 3149, __PRETTY_FUNCTION__))
;
3150 Kind = 3;
3151 }
3152
3153 auto *DTST = dyn_cast<DeducedTemplateSpecializationType>(Deduced);
3154 TemplateName TN = DTST ? DTST->getTemplateName() : TemplateName();
3155
3156 SemaRef.Diag(AutoRange.getBegin(), diag::err_auto_not_allowed)
3157 << Kind << Error << (int)SemaRef.getTemplateNameKindForDiagnostics(TN)
3158 << QualType(Deduced, 0) << AutoRange;
3159 if (auto *TD = TN.getAsTemplateDecl())
3160 SemaRef.Diag(TD->getLocation(), diag::note_template_decl_here);
3161
3162 T = SemaRef.Context.IntTy;
3163 D.setInvalidType(true);
3164 } else if (Auto && !HaveTrailing &&
3165 D.getContext() != DeclaratorContext::LambdaExprContext) {
3166 // If there was a trailing return type, we already got
3167 // warn_cxx98_compat_trailing_return_type in the parser.
3168 SemaRef.Diag(AutoRange.getBegin(),
3169 D.getContext() ==
3170 DeclaratorContext::LambdaExprParameterContext
3171 ? diag::warn_cxx11_compat_generic_lambda
3172 : IsDeducedReturnType
3173 ? diag::warn_cxx11_compat_deduced_return_type
3174 : diag::warn_cxx98_compat_auto_type_specifier)
3175 << AutoRange;
3176 }
3177 }
3178
3179 if (SemaRef.getLangOpts().CPlusPlus &&
3180 OwnedTagDecl && OwnedTagDecl->isCompleteDefinition()) {
3181 // Check the contexts where C++ forbids the declaration of a new class
3182 // or enumeration in a type-specifier-seq.
3183 unsigned DiagID = 0;
3184 switch (D.getContext()) {
3185 case DeclaratorContext::TrailingReturnContext:
3186 case DeclaratorContext::TrailingReturnVarContext:
3187 // Class and enumeration definitions are syntactically not allowed in
3188 // trailing return types.
3189 llvm_unreachable("parser should not have allowed this")::llvm::llvm_unreachable_internal("parser should not have allowed this"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 3189)
;
3190 break;
3191 case DeclaratorContext::FileContext:
3192 case DeclaratorContext::MemberContext:
3193 case DeclaratorContext::BlockContext:
3194 case DeclaratorContext::ForContext:
3195 case DeclaratorContext::InitStmtContext:
3196 case DeclaratorContext::BlockLiteralContext:
3197 case DeclaratorContext::LambdaExprContext:
3198 // C++11 [dcl.type]p3:
3199 // A type-specifier-seq shall not define a class or enumeration unless
3200 // it appears in the type-id of an alias-declaration (7.1.3) that is not
3201 // the declaration of a template-declaration.
3202 case DeclaratorContext::AliasDeclContext:
3203 break;
3204 case DeclaratorContext::AliasTemplateContext:
3205 DiagID = diag::err_type_defined_in_alias_template;
3206 break;
3207 case DeclaratorContext::TypeNameContext:
3208 case DeclaratorContext::FunctionalCastContext:
3209 case DeclaratorContext::ConversionIdContext:
3210 case DeclaratorContext::TemplateParamContext:
3211 case DeclaratorContext::CXXNewContext:
3212 case DeclaratorContext::CXXCatchContext:
3213 case DeclaratorContext::ObjCCatchContext:
3214 case DeclaratorContext::TemplateArgContext:
3215 case DeclaratorContext::TemplateTypeArgContext:
3216 DiagID = diag::err_type_defined_in_type_specifier;
3217 break;
3218 case DeclaratorContext::PrototypeContext:
3219 case DeclaratorContext::LambdaExprParameterContext:
3220 case DeclaratorContext::ObjCParameterContext:
3221 case DeclaratorContext::ObjCResultContext:
3222 case DeclaratorContext::KNRTypeListContext:
3223 // C++ [dcl.fct]p6:
3224 // Types shall not be defined in return or parameter types.
3225 DiagID = diag::err_type_defined_in_param_type;
3226 break;
3227 case DeclaratorContext::ConditionContext:
3228 // C++ 6.4p2:
3229 // The type-specifier-seq shall not contain typedef and shall not declare
3230 // a new class or enumeration.
3231 DiagID = diag::err_type_defined_in_condition;
3232 break;
3233 }
3234
3235 if (DiagID != 0) {
3236 SemaRef.Diag(OwnedTagDecl->getLocation(), DiagID)
3237 << SemaRef.Context.getTypeDeclType(OwnedTagDecl);
3238 D.setInvalidType(true);
3239 }
3240 }
3241
3242 assert(!T.isNull() && "This function should not return a null type")((!T.isNull() && "This function should not return a null type"
) ? static_cast<void> (0) : __assert_fail ("!T.isNull() && \"This function should not return a null type\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 3242, __PRETTY_FUNCTION__))
;
3243 return T;
3244}
3245
3246/// Produce an appropriate diagnostic for an ambiguity between a function
3247/// declarator and a C++ direct-initializer.
3248static void warnAboutAmbiguousFunction(Sema &S, Declarator &D,
3249 DeclaratorChunk &DeclType, QualType RT) {
3250 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun;
3251 assert(FTI.isAmbiguous && "no direct-initializer / function ambiguity")((FTI.isAmbiguous && "no direct-initializer / function ambiguity"
) ? static_cast<void> (0) : __assert_fail ("FTI.isAmbiguous && \"no direct-initializer / function ambiguity\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 3251, __PRETTY_FUNCTION__))
;
3252
3253 // If the return type is void there is no ambiguity.
3254 if (RT->isVoidType())
3255 return;
3256
3257 // An initializer for a non-class type can have at most one argument.
3258 if (!RT->isRecordType() && FTI.NumParams > 1)
3259 return;
3260
3261 // An initializer for a reference must have exactly one argument.
3262 if (RT->isReferenceType() && FTI.NumParams != 1)
3263 return;
3264
3265 // Only warn if this declarator is declaring a function at block scope, and
3266 // doesn't have a storage class (such as 'extern') specified.
3267 if (!D.isFunctionDeclarator() ||
3268 D.getFunctionDefinitionKind() != FDK_Declaration ||
3269 !S.CurContext->isFunctionOrMethod() ||
3270 D.getDeclSpec().getStorageClassSpec()
3271 != DeclSpec::SCS_unspecified)
3272 return;
3273
3274 // Inside a condition, a direct initializer is not permitted. We allow one to
3275 // be parsed in order to give better diagnostics in condition parsing.
3276 if (D.getContext() == DeclaratorContext::ConditionContext)
3277 return;
3278
3279 SourceRange ParenRange(DeclType.Loc, DeclType.EndLoc);
3280
3281 S.Diag(DeclType.Loc,
3282 FTI.NumParams ? diag::warn_parens_disambiguated_as_function_declaration
3283 : diag::warn_empty_parens_are_function_decl)
3284 << ParenRange;
3285
3286 // If the declaration looks like:
3287 // T var1,
3288 // f();
3289 // and name lookup finds a function named 'f', then the ',' was
3290 // probably intended to be a ';'.
3291 if (!D.isFirstDeclarator() && D.getIdentifier()) {
3292 FullSourceLoc Comma(D.getCommaLoc(), S.SourceMgr);
3293 FullSourceLoc Name(D.getIdentifierLoc(), S.SourceMgr);
3294 if (Comma.getFileID() != Name.getFileID() ||
3295 Comma.getSpellingLineNumber() != Name.getSpellingLineNumber()) {
3296 LookupResult Result(S, D.getIdentifier(), SourceLocation(),
3297 Sema::LookupOrdinaryName);
3298 if (S.LookupName(Result, S.getCurScope()))
3299 S.Diag(D.getCommaLoc(), diag::note_empty_parens_function_call)
3300 << FixItHint::CreateReplacement(D.getCommaLoc(), ";")
3301 << D.getIdentifier();
3302 Result.suppressDiagnostics();
3303 }
3304 }
3305
3306 if (FTI.NumParams > 0) {
3307 // For a declaration with parameters, eg. "T var(T());", suggest adding
3308 // parens around the first parameter to turn the declaration into a
3309 // variable declaration.
3310 SourceRange Range = FTI.Params[0].Param->getSourceRange();
3311 SourceLocation B = Range.getBegin();
3312 SourceLocation E = S.getLocForEndOfToken(Range.getEnd());
3313 // FIXME: Maybe we should suggest adding braces instead of parens
3314 // in C++11 for classes that don't have an initializer_list constructor.
3315 S.Diag(B, diag::note_additional_parens_for_variable_declaration)
3316 << FixItHint::CreateInsertion(B, "(")
3317 << FixItHint::CreateInsertion(E, ")");
3318 } else {
3319 // For a declaration without parameters, eg. "T var();", suggest replacing
3320 // the parens with an initializer to turn the declaration into a variable
3321 // declaration.
3322 const CXXRecordDecl *RD = RT->getAsCXXRecordDecl();
3323
3324 // Empty parens mean value-initialization, and no parens mean
3325 // default initialization. These are equivalent if the default
3326 // constructor is user-provided or if zero-initialization is a
3327 // no-op.
3328 if (RD && RD->hasDefinition() &&
3329 (RD->isEmpty() || RD->hasUserProvidedDefaultConstructor()))
3330 S.Diag(DeclType.Loc, diag::note_empty_parens_default_ctor)
3331 << FixItHint::CreateRemoval(ParenRange);
3332 else {
3333 std::string Init =
3334 S.getFixItZeroInitializerForType(RT, ParenRange.getBegin());
3335 if (Init.empty() && S.LangOpts.CPlusPlus11)
3336 Init = "{}";
3337 if (!Init.empty())
3338 S.Diag(DeclType.Loc, diag::note_empty_parens_zero_initialize)
3339 << FixItHint::CreateReplacement(ParenRange, Init);
3340 }
3341 }
3342}
3343
3344/// Produce an appropriate diagnostic for a declarator with top-level
3345/// parentheses.
3346static void warnAboutRedundantParens(Sema &S, Declarator &D, QualType T) {
3347 DeclaratorChunk &Paren = D.getTypeObject(D.getNumTypeObjects() - 1);
3348 assert(Paren.Kind == DeclaratorChunk::Paren &&((Paren.Kind == DeclaratorChunk::Paren && "do not have redundant top-level parentheses"
) ? static_cast<void> (0) : __assert_fail ("Paren.Kind == DeclaratorChunk::Paren && \"do not have redundant top-level parentheses\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 3349, __PRETTY_FUNCTION__))
3349 "do not have redundant top-level parentheses")((Paren.Kind == DeclaratorChunk::Paren && "do not have redundant top-level parentheses"
) ? static_cast<void> (0) : __assert_fail ("Paren.Kind == DeclaratorChunk::Paren && \"do not have redundant top-level parentheses\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 3349, __PRETTY_FUNCTION__))
;
3350
3351 // This is a syntactic check; we're not interested in cases that arise
3352 // during template instantiation.
3353 if (S.inTemplateInstantiation())
3354 return;
3355
3356 // Check whether this could be intended to be a construction of a temporary
3357 // object in C++ via a function-style cast.
3358 bool CouldBeTemporaryObject =
3359 S.getLangOpts().CPlusPlus && D.isExpressionContext() &&
3360 !D.isInvalidType() && D.getIdentifier() &&
3361 D.getDeclSpec().getParsedSpecifiers() == DeclSpec::PQ_TypeSpecifier &&
3362 (T->isRecordType() || T->isDependentType()) &&
3363 D.getDeclSpec().getTypeQualifiers() == 0 && D.isFirstDeclarator();
3364
3365 bool StartsWithDeclaratorId = true;
3366 for (auto &C : D.type_objects()) {
3367 switch (C.Kind) {
3368 case DeclaratorChunk::Paren:
3369 if (&C == &Paren)
3370 continue;
3371 LLVM_FALLTHROUGH[[gnu::fallthrough]];
3372 case DeclaratorChunk::Pointer:
3373 StartsWithDeclaratorId = false;
3374 continue;
3375
3376 case DeclaratorChunk::Array:
3377 if (!C.Arr.NumElts)
3378 CouldBeTemporaryObject = false;
3379 continue;
3380
3381 case DeclaratorChunk::Reference:
3382 // FIXME: Suppress the warning here if there is no initializer; we're
3383 // going to give an error anyway.
3384 // We assume that something like 'T (&x) = y;' is highly likely to not
3385 // be intended to be a temporary object.
3386 CouldBeTemporaryObject = false;
3387 StartsWithDeclaratorId = false;
3388 continue;
3389
3390 case DeclaratorChunk::Function:
3391 // In a new-type-id, function chunks require parentheses.
3392 if (D.getContext() == DeclaratorContext::CXXNewContext)
3393 return;
3394 // FIXME: "A(f())" deserves a vexing-parse warning, not just a
3395 // redundant-parens warning, but we don't know whether the function
3396 // chunk was syntactically valid as an expression here.
3397 CouldBeTemporaryObject = false;
3398 continue;
3399
3400 case DeclaratorChunk::BlockPointer:
3401 case DeclaratorChunk::MemberPointer:
3402 case DeclaratorChunk::Pipe:
3403 // These cannot appear in expressions.
3404 CouldBeTemporaryObject = false;
3405 StartsWithDeclaratorId = false;
3406 continue;
3407 }
3408 }
3409
3410 // FIXME: If there is an initializer, assume that this is not intended to be
3411 // a construction of a temporary object.
3412
3413 // Check whether the name has already been declared; if not, this is not a
3414 // function-style cast.
3415 if (CouldBeTemporaryObject) {
3416 LookupResult Result(S, D.getIdentifier(), SourceLocation(),
3417 Sema::LookupOrdinaryName);
3418 if (!S.LookupName(Result, S.getCurScope()))
3419 CouldBeTemporaryObject = false;
3420 Result.suppressDiagnostics();
3421 }
3422
3423 SourceRange ParenRange(Paren.Loc, Paren.EndLoc);
3424
3425 if (!CouldBeTemporaryObject) {
3426 // If we have A (::B), the parentheses affect the meaning of the program.
3427 // Suppress the warning in that case. Don't bother looking at the DeclSpec
3428 // here: even (e.g.) "int ::x" is visually ambiguous even though it's
3429 // formally unambiguous.
3430 if (StartsWithDeclaratorId && D.getCXXScopeSpec().isValid()) {
3431 for (NestedNameSpecifier *NNS = D.getCXXScopeSpec().getScopeRep(); NNS;
3432 NNS = NNS->getPrefix()) {
3433 if (NNS->getKind() == NestedNameSpecifier::Global)
3434 return;
3435 }
3436 }
3437
3438 S.Diag(Paren.Loc, diag::warn_redundant_parens_around_declarator)
3439 << ParenRange << FixItHint::CreateRemoval(Paren.Loc)
3440 << FixItHint::CreateRemoval(Paren.EndLoc);
3441 return;
3442 }
3443
3444 S.Diag(Paren.Loc, diag::warn_parens_disambiguated_as_variable_declaration)
3445 << ParenRange << D.getIdentifier();
3446 auto *RD = T->getAsCXXRecordDecl();
3447 if (!RD || !RD->hasDefinition() || RD->hasNonTrivialDestructor())
3448 S.Diag(Paren.Loc, diag::note_raii_guard_add_name)
3449 << FixItHint::CreateInsertion(Paren.Loc, " varname") << T
3450 << D.getIdentifier();
3451 // FIXME: A cast to void is probably a better suggestion in cases where it's
3452 // valid (when there is no initializer and we're not in a condition).
3453 S.Diag(D.getBeginLoc(), diag::note_function_style_cast_add_parentheses)
3454 << FixItHint::CreateInsertion(D.getBeginLoc(), "(")
3455 << FixItHint::CreateInsertion(S.getLocForEndOfToken(D.getEndLoc()), ")");
3456 S.Diag(Paren.Loc, diag::note_remove_parens_for_variable_declaration)
3457 << FixItHint::CreateRemoval(Paren.Loc)
3458 << FixItHint::CreateRemoval(Paren.EndLoc);
3459}
3460
3461/// Helper for figuring out the default CC for a function declarator type. If
3462/// this is the outermost chunk, then we can determine the CC from the
3463/// declarator context. If not, then this could be either a member function
3464/// type or normal function type.
3465static CallingConv getCCForDeclaratorChunk(
3466 Sema &S, Declarator &D, const ParsedAttributesView &AttrList,
3467 const DeclaratorChunk::FunctionTypeInfo &FTI, unsigned ChunkIndex) {
3468 assert(D.getTypeObject(ChunkIndex).Kind == DeclaratorChunk::Function)((D.getTypeObject(ChunkIndex).Kind == DeclaratorChunk::Function
) ? static_cast<void> (0) : __assert_fail ("D.getTypeObject(ChunkIndex).Kind == DeclaratorChunk::Function"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 3468, __PRETTY_FUNCTION__))
;
3469
3470 // Check for an explicit CC attribute.
3471 for (const ParsedAttr &AL : AttrList) {
3472 switch (AL.getKind()) {
3473 CALLING_CONV_ATTRS_CASELISTcase ParsedAttr::AT_CDecl: case ParsedAttr::AT_FastCall: case
ParsedAttr::AT_StdCall: case ParsedAttr::AT_ThisCall: case ParsedAttr
::AT_RegCall: case ParsedAttr::AT_Pascal: case ParsedAttr::AT_SwiftCall
: case ParsedAttr::AT_VectorCall: case ParsedAttr::AT_AArch64VectorPcs
: case ParsedAttr::AT_MSABI: case ParsedAttr::AT_SysVABI: case
ParsedAttr::AT_Pcs: case ParsedAttr::AT_IntelOclBicc: case ParsedAttr
::AT_PreserveMost: case ParsedAttr::AT_PreserveAll
: {
3474 // Ignore attributes that don't validate or can't apply to the
3475 // function type. We'll diagnose the failure to apply them in
3476 // handleFunctionTypeAttr.
3477 CallingConv CC;
3478 if (!S.CheckCallingConvAttr(AL, CC) &&
3479 (!FTI.isVariadic || supportsVariadicCall(CC))) {
3480 return CC;
3481 }
3482 break;
3483 }
3484
3485 default:
3486 break;
3487 }
3488 }
3489
3490 bool IsCXXInstanceMethod = false;
3491
3492 if (S.getLangOpts().CPlusPlus) {
3493 // Look inwards through parentheses to see if this chunk will form a
3494 // member pointer type or if we're the declarator. Any type attributes
3495 // between here and there will override the CC we choose here.
3496 unsigned I = ChunkIndex;
3497 bool FoundNonParen = false;
3498 while (I && !FoundNonParen) {
3499 --I;
3500 if (D.getTypeObject(I).Kind != DeclaratorChunk::Paren)
3501 FoundNonParen = true;
3502 }
3503
3504 if (FoundNonParen) {
3505 // If we're not the declarator, we're a regular function type unless we're
3506 // in a member pointer.
3507 IsCXXInstanceMethod =
3508 D.getTypeObject(I).Kind == DeclaratorChunk::MemberPointer;
3509 } else if (D.getContext() == DeclaratorContext::LambdaExprContext) {
3510 // This can only be a call operator for a lambda, which is an instance
3511 // method.
3512 IsCXXInstanceMethod = true;
3513 } else {
3514 // We're the innermost decl chunk, so must be a function declarator.
3515 assert(D.isFunctionDeclarator())((D.isFunctionDeclarator()) ? static_cast<void> (0) : __assert_fail
("D.isFunctionDeclarator()", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 3515, __PRETTY_FUNCTION__))
;
3516
3517 // If we're inside a record, we're declaring a method, but it could be
3518 // explicitly or implicitly static.
3519 IsCXXInstanceMethod =
3520 D.isFirstDeclarationOfMember() &&
3521 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef &&
3522 !D.isStaticMember();
3523 }
3524 }
3525
3526 CallingConv CC = S.Context.getDefaultCallingConvention(FTI.isVariadic,
3527 IsCXXInstanceMethod);
3528
3529 // Attribute AT_OpenCLKernel affects the calling convention for SPIR
3530 // and AMDGPU targets, hence it cannot be treated as a calling
3531 // convention attribute. This is the simplest place to infer
3532 // calling convention for OpenCL kernels.
3533 if (S.getLangOpts().OpenCL) {
3534 for (const ParsedAttr &AL : D.getDeclSpec().getAttributes()) {
3535 if (AL.getKind() == ParsedAttr::AT_OpenCLKernel) {
3536 CC = CC_OpenCLKernel;
3537 break;
3538 }
3539 }
3540 }
3541
3542 return CC;
3543}
3544
3545namespace {
3546 /// A simple notion of pointer kinds, which matches up with the various
3547 /// pointer declarators.
3548 enum class SimplePointerKind {
3549 Pointer,
3550 BlockPointer,
3551 MemberPointer,
3552 Array,
3553 };
3554} // end anonymous namespace
3555
3556IdentifierInfo *Sema::getNullabilityKeyword(NullabilityKind nullability) {
3557 switch (nullability) {
3558 case NullabilityKind::NonNull:
3559 if (!Ident__Nonnull)
3560 Ident__Nonnull = PP.getIdentifierInfo("_Nonnull");
3561 return Ident__Nonnull;
3562
3563 case NullabilityKind::Nullable:
3564 if (!Ident__Nullable)
3565 Ident__Nullable = PP.getIdentifierInfo("_Nullable");
3566 return Ident__Nullable;
3567
3568 case NullabilityKind::Unspecified:
3569 if (!Ident__Null_unspecified)
3570 Ident__Null_unspecified = PP.getIdentifierInfo("_Null_unspecified");
3571 return Ident__Null_unspecified;
3572 }
3573 llvm_unreachable("Unknown nullability kind.")::llvm::llvm_unreachable_internal("Unknown nullability kind."
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 3573)
;
3574}
3575
3576/// Retrieve the identifier "NSError".
3577IdentifierInfo *Sema::getNSErrorIdent() {
3578 if (!Ident_NSError)
3579 Ident_NSError = PP.getIdentifierInfo("NSError");
3580
3581 return Ident_NSError;
3582}
3583
3584/// Check whether there is a nullability attribute of any kind in the given
3585/// attribute list.
3586static bool hasNullabilityAttr(const ParsedAttributesView &attrs) {
3587 for (const ParsedAttr &AL : attrs) {
3588 if (AL.getKind() == ParsedAttr::AT_TypeNonNull ||
3589 AL.getKind() == ParsedAttr::AT_TypeNullable ||
3590 AL.getKind() == ParsedAttr::AT_TypeNullUnspecified)
3591 return true;
3592 }
3593
3594 return false;
3595}
3596
3597namespace {
3598 /// Describes the kind of a pointer a declarator describes.
3599 enum class PointerDeclaratorKind {
3600 // Not a pointer.
3601 NonPointer,
3602 // Single-level pointer.
3603 SingleLevelPointer,
3604 // Multi-level pointer (of any pointer kind).
3605 MultiLevelPointer,
3606 // CFFooRef*
3607 MaybePointerToCFRef,
3608 // CFErrorRef*
3609 CFErrorRefPointer,
3610 // NSError**
3611 NSErrorPointerPointer,
3612 };
3613
3614 /// Describes a declarator chunk wrapping a pointer that marks inference as
3615 /// unexpected.
3616 // These values must be kept in sync with diagnostics.
3617 enum class PointerWrappingDeclaratorKind {
3618 /// Pointer is top-level.
3619 None = -1,
3620 /// Pointer is an array element.
3621 Array = 0,
3622 /// Pointer is the referent type of a C++ reference.
3623 Reference = 1
3624 };
3625} // end anonymous namespace
3626
3627/// Classify the given declarator, whose type-specified is \c type, based on
3628/// what kind of pointer it refers to.
3629///
3630/// This is used to determine the default nullability.
3631static PointerDeclaratorKind
3632classifyPointerDeclarator(Sema &S, QualType type, Declarator &declarator,
3633 PointerWrappingDeclaratorKind &wrappingKind) {
3634 unsigned numNormalPointers = 0;
3635
3636 // For any dependent type, we consider it a non-pointer.
3637 if (type->isDependentType())
3638 return PointerDeclaratorKind::NonPointer;
3639
3640 // Look through the declarator chunks to identify pointers.
3641 for (unsigned i = 0, n = declarator.getNumTypeObjects(); i != n; ++i) {
3642 DeclaratorChunk &chunk = declarator.getTypeObject(i);
3643 switch (chunk.Kind) {
3644 case DeclaratorChunk::Array:
3645 if (numNormalPointers == 0)
3646 wrappingKind = PointerWrappingDeclaratorKind::Array;
3647 break;
3648
3649 case DeclaratorChunk::Function:
3650 case DeclaratorChunk::Pipe:
3651 break;
3652
3653 case DeclaratorChunk::BlockPointer:
3654 case DeclaratorChunk::MemberPointer:
3655 return numNormalPointers > 0 ? PointerDeclaratorKind::MultiLevelPointer
3656 : PointerDeclaratorKind::SingleLevelPointer;
3657
3658 case DeclaratorChunk::Paren:
3659 break;
3660
3661 case DeclaratorChunk::Reference:
3662 if (numNormalPointers == 0)
3663 wrappingKind = PointerWrappingDeclaratorKind::Reference;
3664 break;
3665
3666 case DeclaratorChunk::Pointer:
3667 ++numNormalPointers;
3668 if (numNormalPointers > 2)
3669 return PointerDeclaratorKind::MultiLevelPointer;
3670 break;
3671 }
3672 }
3673
3674 // Then, dig into the type specifier itself.
3675 unsigned numTypeSpecifierPointers = 0;
3676 do {
3677 // Decompose normal pointers.
3678 if (auto ptrType = type->getAs<PointerType>()) {
3679 ++numNormalPointers;
3680
3681 if (numNormalPointers > 2)
3682 return PointerDeclaratorKind::MultiLevelPointer;
3683
3684 type = ptrType->getPointeeType();
3685 ++numTypeSpecifierPointers;
3686 continue;
3687 }
3688
3689 // Decompose block pointers.
3690 if (type->getAs<BlockPointerType>()) {
3691 return numNormalPointers > 0 ? PointerDeclaratorKind::MultiLevelPointer
3692 : PointerDeclaratorKind::SingleLevelPointer;
3693 }
3694
3695 // Decompose member pointers.
3696 if (type->getAs<MemberPointerType>()) {
3697 return numNormalPointers > 0 ? PointerDeclaratorKind::MultiLevelPointer
3698 : PointerDeclaratorKind::SingleLevelPointer;
3699 }
3700
3701 // Look at Objective-C object pointers.
3702 if (auto objcObjectPtr = type->getAs<ObjCObjectPointerType>()) {
3703 ++numNormalPointers;
3704 ++numTypeSpecifierPointers;
3705
3706 // If this is NSError**, report that.
3707 if (auto objcClassDecl = objcObjectPtr->getInterfaceDecl()) {
3708 if (objcClassDecl->getIdentifier() == S.getNSErrorIdent() &&
3709 numNormalPointers == 2 && numTypeSpecifierPointers < 2) {
3710 return PointerDeclaratorKind::NSErrorPointerPointer;
3711 }
3712 }
3713
3714 break;
3715 }
3716
3717 // Look at Objective-C class types.
3718 if (auto objcClass = type->getAs<ObjCInterfaceType>()) {
3719 if (objcClass->getInterface()->getIdentifier() == S.getNSErrorIdent()) {
3720 if (numNormalPointers == 2 && numTypeSpecifierPointers < 2)
3721 return PointerDeclaratorKind::NSErrorPointerPointer;
3722 }
3723
3724 break;
3725 }
3726
3727 // If at this point we haven't seen a pointer, we won't see one.
3728 if (numNormalPointers == 0)
3729 return PointerDeclaratorKind::NonPointer;
3730
3731 if (auto recordType = type->getAs<RecordType>()) {
3732 RecordDecl *recordDecl = recordType->getDecl();
3733
3734 bool isCFError = false;
3735 if (S.CFError) {
3736 // If we already know about CFError, test it directly.
3737 isCFError = (S.CFError == recordDecl);
3738 } else {
3739 // Check whether this is CFError, which we identify based on its bridge
3740 // to NSError. CFErrorRef used to be declared with "objc_bridge" but is
3741 // now declared with "objc_bridge_mutable", so look for either one of
3742 // the two attributes.
3743 if (recordDecl->getTagKind() == TTK_Struct && numNormalPointers > 0) {
3744 IdentifierInfo *bridgedType = nullptr;
3745 if (auto bridgeAttr = recordDecl->getAttr<ObjCBridgeAttr>())
3746 bridgedType = bridgeAttr->getBridgedType();
3747 else if (auto bridgeAttr =
3748 recordDecl->getAttr<ObjCBridgeMutableAttr>())
3749 bridgedType = bridgeAttr->getBridgedType();
3750
3751 if (bridgedType == S.getNSErrorIdent()) {
3752 S.CFError = recordDecl;
3753 isCFError = true;
3754 }
3755 }
3756 }
3757
3758 // If this is CFErrorRef*, report it as such.
3759 if (isCFError && numNormalPointers == 2 && numTypeSpecifierPointers < 2) {
3760 return PointerDeclaratorKind::CFErrorRefPointer;
3761 }
3762 break;
3763 }
3764
3765 break;
3766 } while (true);
3767
3768 switch (numNormalPointers) {
3769 case 0:
3770 return PointerDeclaratorKind::NonPointer;
3771
3772 case 1:
3773 return PointerDeclaratorKind::SingleLevelPointer;
3774
3775 case 2:
3776 return PointerDeclaratorKind::MaybePointerToCFRef;
3777
3778 default:
3779 return PointerDeclaratorKind::MultiLevelPointer;
3780 }
3781}
3782
3783static FileID getNullabilityCompletenessCheckFileID(Sema &S,
3784 SourceLocation loc) {
3785 // If we're anywhere in a function, method, or closure context, don't perform
3786 // completeness checks.
3787 for (DeclContext *ctx = S.CurContext; ctx; ctx = ctx->getParent()) {
3788 if (ctx->isFunctionOrMethod())
3789 return FileID();
3790
3791 if (ctx->isFileContext())
3792 break;
3793 }
3794
3795 // We only care about the expansion location.
3796 loc = S.SourceMgr.getExpansionLoc(loc);
3797 FileID file = S.SourceMgr.getFileID(loc);
3798 if (file.isInvalid())
3799 return FileID();
3800
3801 // Retrieve file information.
3802 bool invalid = false;
3803 const SrcMgr::SLocEntry &sloc = S.SourceMgr.getSLocEntry(file, &invalid);
3804 if (invalid || !sloc.isFile())
3805 return FileID();
3806
3807 // We don't want to perform completeness checks on the main file or in
3808 // system headers.
3809 const SrcMgr::FileInfo &fileInfo = sloc.getFile();
3810 if (fileInfo.getIncludeLoc().isInvalid())
3811 return FileID();
3812 if (fileInfo.getFileCharacteristic() != SrcMgr::C_User &&
3813 S.Diags.getSuppressSystemWarnings()) {
3814 return FileID();
3815 }
3816
3817 return file;
3818}
3819
3820/// Creates a fix-it to insert a C-style nullability keyword at \p pointerLoc,
3821/// taking into account whitespace before and after.
3822static void fixItNullability(Sema &S, DiagnosticBuilder &Diag,
3823 SourceLocation PointerLoc,
3824 NullabilityKind Nullability) {
3825 assert(PointerLoc.isValid())((PointerLoc.isValid()) ? static_cast<void> (0) : __assert_fail
("PointerLoc.isValid()", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 3825, __PRETTY_FUNCTION__))
;
3826 if (PointerLoc.isMacroID())
3827 return;
3828
3829 SourceLocation FixItLoc = S.getLocForEndOfToken(PointerLoc);
3830 if (!FixItLoc.isValid() || FixItLoc == PointerLoc)
3831 return;
3832
3833 const char *NextChar = S.SourceMgr.getCharacterData(FixItLoc);
3834 if (!NextChar)
3835 return;
3836
3837 SmallString<32> InsertionTextBuf{" "};
3838 InsertionTextBuf += getNullabilitySpelling(Nullability);
3839 InsertionTextBuf += " ";
3840 StringRef InsertionText = InsertionTextBuf.str();
3841
3842 if (isWhitespace(*NextChar)) {
3843 InsertionText = InsertionText.drop_back();
3844 } else if (NextChar[-1] == '[') {
3845 if (NextChar[0] == ']')
3846 InsertionText = InsertionText.drop_back().drop_front();
3847 else
3848 InsertionText = InsertionText.drop_front();
3849 } else if (!isIdentifierBody(NextChar[0], /*allow dollar*/true) &&
3850 !isIdentifierBody(NextChar[-1], /*allow dollar*/true)) {
3851 InsertionText = InsertionText.drop_back().drop_front();
3852 }
3853
3854 Diag << FixItHint::CreateInsertion(FixItLoc, InsertionText);
3855}
3856
3857static void emitNullabilityConsistencyWarning(Sema &S,
3858 SimplePointerKind PointerKind,
3859 SourceLocation PointerLoc,
3860 SourceLocation PointerEndLoc) {
3861 assert(PointerLoc.isValid())((PointerLoc.isValid()) ? static_cast<void> (0) : __assert_fail
("PointerLoc.isValid()", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 3861, __PRETTY_FUNCTION__))
;
3862
3863 if (PointerKind == SimplePointerKind::Array) {
3864 S.Diag(PointerLoc, diag::warn_nullability_missing_array);
3865 } else {
3866 S.Diag(PointerLoc, diag::warn_nullability_missing)
3867 << static_cast<unsigned>(PointerKind);
3868 }
3869
3870 auto FixItLoc = PointerEndLoc.isValid() ? PointerEndLoc : PointerLoc;
3871 if (FixItLoc.isMacroID())
3872 return;
3873
3874 auto addFixIt = [&](NullabilityKind Nullability) {
3875 auto Diag = S.Diag(FixItLoc, diag::note_nullability_fix_it);
3876 Diag << static_cast<unsigned>(Nullability);
3877 Diag << static_cast<unsigned>(PointerKind);
3878 fixItNullability(S, Diag, FixItLoc, Nullability);
3879 };
3880 addFixIt(NullabilityKind::Nullable);
3881 addFixIt(NullabilityKind::NonNull);
3882}
3883
3884/// Complains about missing nullability if the file containing \p pointerLoc
3885/// has other uses of nullability (either the keywords or the \c assume_nonnull
3886/// pragma).
3887///
3888/// If the file has \e not seen other uses of nullability, this particular
3889/// pointer is saved for possible later diagnosis. See recordNullabilitySeen().
3890static void
3891checkNullabilityConsistency(Sema &S, SimplePointerKind pointerKind,
3892 SourceLocation pointerLoc,
3893 SourceLocation pointerEndLoc = SourceLocation()) {
3894 // Determine which file we're performing consistency checking for.
3895 FileID file = getNullabilityCompletenessCheckFileID(S, pointerLoc);
3896 if (file.isInvalid())
3897 return;
3898
3899 // If we haven't seen any type nullability in this file, we won't warn now
3900 // about anything.
3901 FileNullability &fileNullability = S.NullabilityMap[file];
3902 if (!fileNullability.SawTypeNullability) {
3903 // If this is the first pointer declarator in the file, and the appropriate
3904 // warning is on, record it in case we need to diagnose it retroactively.
3905 diag::kind diagKind;
3906 if (pointerKind == SimplePointerKind::Array)
3907 diagKind = diag::warn_nullability_missing_array;
3908 else
3909 diagKind = diag::warn_nullability_missing;
3910
3911 if (fileNullability.PointerLoc.isInvalid() &&
3912 !S.Context.getDiagnostics().isIgnored(diagKind, pointerLoc)) {
3913 fileNullability.PointerLoc = pointerLoc;
3914 fileNullability.PointerEndLoc = pointerEndLoc;
3915 fileNullability.PointerKind = static_cast<unsigned>(pointerKind);
3916 }
3917
3918 return;
3919 }
3920
3921 // Complain about missing nullability.
3922 emitNullabilityConsistencyWarning(S, pointerKind, pointerLoc, pointerEndLoc);
3923}
3924
3925/// Marks that a nullability feature has been used in the file containing
3926/// \p loc.
3927///
3928/// If this file already had pointer types in it that were missing nullability,
3929/// the first such instance is retroactively diagnosed.
3930///
3931/// \sa checkNullabilityConsistency
3932static void recordNullabilitySeen(Sema &S, SourceLocation loc) {
3933 FileID file = getNullabilityCompletenessCheckFileID(S, loc);
3934 if (file.isInvalid())
3935 return;
3936
3937 FileNullability &fileNullability = S.NullabilityMap[file];
3938 if (fileNullability.SawTypeNullability)
3939 return;
3940 fileNullability.SawTypeNullability = true;
3941
3942 // If we haven't seen any type nullability before, now we have. Retroactively
3943 // diagnose the first unannotated pointer, if there was one.
3944 if (fileNullability.PointerLoc.isInvalid())
3945 return;
3946
3947 auto kind = static_cast<SimplePointerKind>(fileNullability.PointerKind);
3948 emitNullabilityConsistencyWarning(S, kind, fileNullability.PointerLoc,
3949 fileNullability.PointerEndLoc);
3950}
3951
3952/// Returns true if any of the declarator chunks before \p endIndex include a
3953/// level of indirection: array, pointer, reference, or pointer-to-member.
3954///
3955/// Because declarator chunks are stored in outer-to-inner order, testing
3956/// every chunk before \p endIndex is testing all chunks that embed the current
3957/// chunk as part of their type.
3958///
3959/// It is legal to pass the result of Declarator::getNumTypeObjects() as the
3960/// end index, in which case all chunks are tested.
3961static bool hasOuterPointerLikeChunk(const Declarator &D, unsigned endIndex) {
3962 unsigned i = endIndex;
3963 while (i != 0) {
3964 // Walk outwards along the declarator chunks.
3965 --i;
3966 const DeclaratorChunk &DC = D.getTypeObject(i);
3967 switch (DC.Kind) {
3968 case DeclaratorChunk::Paren:
3969 break;
3970 case DeclaratorChunk::Array:
3971 case DeclaratorChunk::Pointer:
3972 case DeclaratorChunk::Reference:
3973 case DeclaratorChunk::MemberPointer:
3974 return true;
3975 case DeclaratorChunk::Function:
3976 case DeclaratorChunk::BlockPointer:
3977 case DeclaratorChunk::Pipe:
3978 // These are invalid anyway, so just ignore.
3979 break;
3980 }
3981 }
3982 return false;
3983}
3984
3985static bool IsNoDerefableChunk(DeclaratorChunk Chunk) {
3986 return (Chunk.Kind == DeclaratorChunk::Pointer ||
3987 Chunk.Kind == DeclaratorChunk::Array);
3988}
3989
3990template<typename AttrT>
3991static AttrT *createSimpleAttr(ASTContext &Ctx, ParsedAttr &AL) {
3992 AL.setUsedAsTypeAttr();
3993 return ::new (Ctx) AttrT(Ctx, AL);
3994}
3995
3996static Attr *createNullabilityAttr(ASTContext &Ctx, ParsedAttr &Attr,
3997 NullabilityKind NK) {
3998 switch (NK) {
3999 case NullabilityKind::NonNull:
4000 return createSimpleAttr<TypeNonNullAttr>(Ctx, Attr);
4001
4002 case NullabilityKind::Nullable:
4003 return createSimpleAttr<TypeNullableAttr>(Ctx, Attr);
4004
4005 case NullabilityKind::Unspecified:
4006 return createSimpleAttr<TypeNullUnspecifiedAttr>(Ctx, Attr);
4007 }
4008 llvm_unreachable("unknown NullabilityKind")::llvm::llvm_unreachable_internal("unknown NullabilityKind", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 4008)
;
4009}
4010
4011// Diagnose whether this is a case with the multiple addr spaces.
4012// Returns true if this is an invalid case.
4013// ISO/IEC TR 18037 S5.3 (amending C99 6.7.3): "No type shall be qualified
4014// by qualifiers for two or more different address spaces."
4015static bool DiagnoseMultipleAddrSpaceAttributes(Sema &S, LangAS ASOld,
4016 LangAS ASNew,
4017 SourceLocation AttrLoc) {
4018 if (ASOld != LangAS::Default) {
4019 if (ASOld != ASNew) {
4020 S.Diag(AttrLoc, diag::err_attribute_address_multiple_qualifiers);
4021 return true;
4022 }
4023 // Emit a warning if they are identical; it's likely unintended.
4024 S.Diag(AttrLoc,
4025 diag::warn_attribute_address_multiple_identical_qualifiers);
4026 }
4027 return false;
4028}
4029
4030static TypeSourceInfo *
4031GetTypeSourceInfoForDeclarator(TypeProcessingState &State,
4032 QualType T, TypeSourceInfo *ReturnTypeInfo);
4033
4034static TypeSourceInfo *GetFullTypeForDeclarator(TypeProcessingState &state,
4035 QualType declSpecType,
4036 TypeSourceInfo *TInfo) {
4037 // The TypeSourceInfo that this function returns will not be a null type.
4038 // If there is an error, this function will fill in a dummy type as fallback.
4039 QualType T = declSpecType;
4040 Declarator &D = state.getDeclarator();
4041 Sema &S = state.getSema();
4042 ASTContext &Context = S.Context;
4043 const LangOptions &LangOpts = S.getLangOpts();
4044
4045 // The name we're declaring, if any.
4046 DeclarationName Name;
4047 if (D.getIdentifier())
4048 Name = D.getIdentifier();
4049
4050 // Does this declaration declare a typedef-name?
4051 bool IsTypedefName =
4052 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef ||
4053 D.getContext() == DeclaratorContext::AliasDeclContext ||
4054 D.getContext() == DeclaratorContext::AliasTemplateContext;
4055
4056 // Does T refer to a function type with a cv-qualifier or a ref-qualifier?
4057 bool IsQualifiedFunction = T->isFunctionProtoType() &&
4058 (!T->castAs<FunctionProtoType>()->getMethodQuals().empty() ||
4059 T->castAs<FunctionProtoType>()->getRefQualifier() != RQ_None);
4060
4061 // If T is 'decltype(auto)', the only declarators we can have are parens
4062 // and at most one function declarator if this is a function declaration.
4063 // If T is a deduced class template specialization type, we can have no
4064 // declarator chunks at all.
4065 if (auto *DT = T->getAs<DeducedType>()) {
4066 const AutoType *AT = T->getAs<AutoType>();
4067 bool IsClassTemplateDeduction = isa<DeducedTemplateSpecializationType>(DT);
4068 if ((AT && AT->isDecltypeAuto()) || IsClassTemplateDeduction) {
4069 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) {
4070 unsigned Index = E - I - 1;
4071 DeclaratorChunk &DeclChunk = D.getTypeObject(Index);
4072 unsigned DiagId = IsClassTemplateDeduction
4073 ? diag::err_deduced_class_template_compound_type
4074 : diag::err_decltype_auto_compound_type;
4075 unsigned DiagKind = 0;
4076 switch (DeclChunk.Kind) {
4077 case DeclaratorChunk::Paren:
4078 // FIXME: Rejecting this is a little silly.
4079 if (IsClassTemplateDeduction) {
4080 DiagKind = 4;
4081 break;
4082 }
4083 continue;
4084 case DeclaratorChunk::Function: {
4085 if (IsClassTemplateDeduction) {
4086 DiagKind = 3;
4087 break;
4088 }
4089 unsigned FnIndex;
4090 if (D.isFunctionDeclarationContext() &&
4091 D.isFunctionDeclarator(FnIndex) && FnIndex == Index)
4092 continue;
4093 DiagId = diag::err_decltype_auto_function_declarator_not_declaration;
4094 break;
4095 }
4096 case DeclaratorChunk::Pointer:
4097 case DeclaratorChunk::BlockPointer:
4098 case DeclaratorChunk::MemberPointer:
4099 DiagKind = 0;
4100 break;
4101 case DeclaratorChunk::Reference:
4102 DiagKind = 1;
4103 break;
4104 case DeclaratorChunk::Array:
4105 DiagKind = 2;
4106 break;
4107 case DeclaratorChunk::Pipe:
4108 break;
4109 }
4110
4111 S.Diag(DeclChunk.Loc, DiagId) << DiagKind;
4112 D.setInvalidType(true);
4113 break;
4114 }
4115 }
4116 }
4117
4118 // Determine whether we should infer _Nonnull on pointer types.
4119 Optional<NullabilityKind> inferNullability;
4120 bool inferNullabilityCS = false;
4121 bool inferNullabilityInnerOnly = false;
4122 bool inferNullabilityInnerOnlyComplete = false;
4123
4124 // Are we in an assume-nonnull region?
4125 bool inAssumeNonNullRegion = false;
4126 SourceLocation assumeNonNullLoc = S.PP.getPragmaAssumeNonNullLoc();
4127 if (assumeNonNullLoc.isValid()) {
4128 inAssumeNonNullRegion = true;
4129 recordNullabilitySeen(S, assumeNonNullLoc);
4130 }
4131
4132 // Whether to complain about missing nullability specifiers or not.
4133 enum {
4134 /// Never complain.
4135 CAMN_No,
4136 /// Complain on the inner pointers (but not the outermost
4137 /// pointer).
4138 CAMN_InnerPointers,
4139 /// Complain about any pointers that don't have nullability
4140 /// specified or inferred.
4141 CAMN_Yes
4142 } complainAboutMissingNullability = CAMN_No;
4143 unsigned NumPointersRemaining = 0;
4144 auto complainAboutInferringWithinChunk = PointerWrappingDeclaratorKind::None;
4145
4146 if (IsTypedefName) {
4147 // For typedefs, we do not infer any nullability (the default),
4148 // and we only complain about missing nullability specifiers on
4149 // inner pointers.
4150 complainAboutMissingNullability = CAMN_InnerPointers;
4151
4152 if (T->canHaveNullability(/*ResultIfUnknown*/false) &&
4153 !T->getNullability(S.Context)) {
4154 // Note that we allow but don't require nullability on dependent types.
4155 ++NumPointersRemaining;
4156 }
4157
4158 for (unsigned i = 0, n = D.getNumTypeObjects(); i != n; ++i) {
4159 DeclaratorChunk &chunk = D.getTypeObject(i);
4160 switch (chunk.Kind) {
4161 case DeclaratorChunk::Array:
4162 case DeclaratorChunk::Function:
4163 case DeclaratorChunk::Pipe:
4164 break;
4165
4166 case DeclaratorChunk::BlockPointer:
4167 case DeclaratorChunk::MemberPointer:
4168 ++NumPointersRemaining;
4169 break;
4170
4171 case DeclaratorChunk::Paren:
4172 case DeclaratorChunk::Reference:
4173 continue;
4174
4175 case DeclaratorChunk::Pointer:
4176 ++NumPointersRemaining;
4177 continue;
4178 }
4179 }
4180 } else {
4181 bool isFunctionOrMethod = false;
4182 switch (auto context = state.getDeclarator().getContext()) {
4183 case DeclaratorContext::ObjCParameterContext:
4184 case DeclaratorContext::ObjCResultContext:
4185 case DeclaratorContext::PrototypeContext:
4186 case DeclaratorContext::TrailingReturnContext:
4187 case DeclaratorContext::TrailingReturnVarContext:
4188 isFunctionOrMethod = true;
4189 LLVM_FALLTHROUGH[[gnu::fallthrough]];
4190
4191 case DeclaratorContext::MemberContext:
4192 if (state.getDeclarator().isObjCIvar() && !isFunctionOrMethod) {
4193 complainAboutMissingNullability = CAMN_No;
4194 break;
4195 }
4196
4197 // Weak properties are inferred to be nullable.
4198 if (state.getDeclarator().isObjCWeakProperty() && inAssumeNonNullRegion) {
4199 inferNullability = NullabilityKind::Nullable;
4200 break;
4201 }
4202
4203 LLVM_FALLTHROUGH[[gnu::fallthrough]];
4204
4205 case DeclaratorContext::FileContext:
4206 case DeclaratorContext::KNRTypeListContext: {
4207 complainAboutMissingNullability = CAMN_Yes;
4208
4209 // Nullability inference depends on the type and declarator.
4210 auto wrappingKind = PointerWrappingDeclaratorKind::None;
4211 switch (classifyPointerDeclarator(S, T, D, wrappingKind)) {
4212 case PointerDeclaratorKind::NonPointer:
4213 case PointerDeclaratorKind::MultiLevelPointer:
4214 // Cannot infer nullability.
4215 break;
4216
4217 case PointerDeclaratorKind::SingleLevelPointer:
4218 // Infer _Nonnull if we are in an assumes-nonnull region.
4219 if (inAssumeNonNullRegion) {
4220 complainAboutInferringWithinChunk = wrappingKind;
4221 inferNullability = NullabilityKind::NonNull;
4222 inferNullabilityCS =
4223 (context == DeclaratorContext::ObjCParameterContext ||
4224 context == DeclaratorContext::ObjCResultContext);
4225 }
4226 break;
4227
4228 case PointerDeclaratorKind::CFErrorRefPointer:
4229 case PointerDeclaratorKind::NSErrorPointerPointer:
4230 // Within a function or method signature, infer _Nullable at both
4231 // levels.
4232 if (isFunctionOrMethod && inAssumeNonNullRegion)
4233 inferNullability = NullabilityKind::Nullable;
4234 break;
4235
4236 case PointerDeclaratorKind::MaybePointerToCFRef:
4237 if (isFunctionOrMethod) {
4238 // On pointer-to-pointer parameters marked cf_returns_retained or
4239 // cf_returns_not_retained, if the outer pointer is explicit then
4240 // infer the inner pointer as _Nullable.
4241 auto hasCFReturnsAttr =
4242 [](const ParsedAttributesView &AttrList) -> bool {
4243 return AttrList.hasAttribute(ParsedAttr::AT_CFReturnsRetained) ||
4244 AttrList.hasAttribute(ParsedAttr::AT_CFReturnsNotRetained);
4245 };
4246 if (const auto *InnermostChunk = D.getInnermostNonParenChunk()) {
4247 if (hasCFReturnsAttr(D.getAttributes()) ||
4248 hasCFReturnsAttr(InnermostChunk->getAttrs()) ||
4249 hasCFReturnsAttr(D.getDeclSpec().getAttributes())) {
4250 inferNullability = NullabilityKind::Nullable;
4251 inferNullabilityInnerOnly = true;
4252 }
4253 }
4254 }
4255 break;
4256 }
4257 break;
4258 }
4259
4260 case DeclaratorContext::ConversionIdContext:
4261 complainAboutMissingNullability = CAMN_Yes;
4262 break;
4263
4264 case DeclaratorContext::AliasDeclContext:
4265 case DeclaratorContext::AliasTemplateContext:
4266 case DeclaratorContext::BlockContext:
4267 case DeclaratorContext::BlockLiteralContext:
4268 case DeclaratorContext::ConditionContext:
4269 case DeclaratorContext::CXXCatchContext:
4270 case DeclaratorContext::CXXNewContext:
4271 case DeclaratorContext::ForContext:
4272 case DeclaratorContext::InitStmtContext:
4273 case DeclaratorContext::LambdaExprContext:
4274 case DeclaratorContext::LambdaExprParameterContext:
4275 case DeclaratorContext::ObjCCatchContext:
4276 case DeclaratorContext::TemplateParamContext:
4277 case DeclaratorContext::TemplateArgContext:
4278 case DeclaratorContext::TemplateTypeArgContext:
4279 case DeclaratorContext::TypeNameContext:
4280 case DeclaratorContext::FunctionalCastContext:
4281 // Don't infer in these contexts.
4282 break;
4283 }
4284 }
4285
4286 // Local function that returns true if its argument looks like a va_list.
4287 auto isVaList = [&S](QualType T) -> bool {
4288 auto *typedefTy = T->getAs<TypedefType>();
4289 if (!typedefTy)
4290 return false;
4291 TypedefDecl *vaListTypedef = S.Context.getBuiltinVaListDecl();
4292 do {
4293 if (typedefTy->getDecl() == vaListTypedef)
4294 return true;
4295 if (auto *name = typedefTy->getDecl()->getIdentifier())
4296 if (name->isStr("va_list"))
4297 return true;
4298 typedefTy = typedefTy->desugar()->getAs<TypedefType>();
4299 } while (typedefTy);
4300 return false;
4301 };
4302
4303 // Local function that checks the nullability for a given pointer declarator.
4304 // Returns true if _Nonnull was inferred.
4305 auto inferPointerNullability =
4306 [&](SimplePointerKind pointerKind, SourceLocation pointerLoc,
4307 SourceLocation pointerEndLoc,
4308 ParsedAttributesView &attrs, AttributePool &Pool) -> ParsedAttr * {
4309 // We've seen a pointer.
4310 if (NumPointersRemaining > 0)
4311 --NumPointersRemaining;
4312
4313 // If a nullability attribute is present, there's nothing to do.
4314 if (hasNullabilityAttr(attrs))
4315 return nullptr;
4316
4317 // If we're supposed to infer nullability, do so now.
4318 if (inferNullability && !inferNullabilityInnerOnlyComplete) {
4319 ParsedAttr::Syntax syntax = inferNullabilityCS
4320 ? ParsedAttr::AS_ContextSensitiveKeyword
4321 : ParsedAttr::AS_Keyword;
4322 ParsedAttr *nullabilityAttr = Pool.create(
4323 S.getNullabilityKeyword(*inferNullability), SourceRange(pointerLoc),
4324 nullptr, SourceLocation(), nullptr, 0, syntax);
4325
4326 attrs.addAtEnd(nullabilityAttr);
4327
4328 if (inferNullabilityCS) {
4329 state.getDeclarator().getMutableDeclSpec().getObjCQualifiers()
4330 ->setObjCDeclQualifier(ObjCDeclSpec::DQ_CSNullability);
4331 }
4332
4333 if (pointerLoc.isValid() &&
4334 complainAboutInferringWithinChunk !=
4335 PointerWrappingDeclaratorKind::None) {
4336 auto Diag =
4337 S.Diag(pointerLoc, diag::warn_nullability_inferred_on_nested_type);
4338 Diag << static_cast<int>(complainAboutInferringWithinChunk);
4339 fixItNullability(S, Diag, pointerLoc, NullabilityKind::NonNull);
4340 }
4341
4342 if (inferNullabilityInnerOnly)
4343 inferNullabilityInnerOnlyComplete = true;
4344 return nullabilityAttr;
4345 }
4346
4347 // If we're supposed to complain about missing nullability, do so
4348 // now if it's truly missing.
4349 switch (complainAboutMissingNullability) {
4350 case CAMN_No:
4351 break;
4352
4353 case CAMN_InnerPointers:
4354 if (NumPointersRemaining == 0)
4355 break;
4356 LLVM_FALLTHROUGH[[gnu::fallthrough]];
4357
4358 case CAMN_Yes:
4359 checkNullabilityConsistency(S, pointerKind, pointerLoc, pointerEndLoc);
4360 }
4361 return nullptr;
4362 };
4363
4364 // If the type itself could have nullability but does not, infer pointer
4365 // nullability and perform consistency checking.
4366 if (S.CodeSynthesisContexts.empty()) {
4367 if (T->canHaveNullability(/*ResultIfUnknown*/false) &&
4368 !T->getNullability(S.Context)) {
4369 if (isVaList(T)) {
4370 // Record that we've seen a pointer, but do nothing else.
4371 if (NumPointersRemaining > 0)
4372 --NumPointersRemaining;
4373 } else {
4374 SimplePointerKind pointerKind = SimplePointerKind::Pointer;
4375 if (T->isBlockPointerType())
4376 pointerKind = SimplePointerKind::BlockPointer;
4377 else if (T->isMemberPointerType())
4378 pointerKind = SimplePointerKind::MemberPointer;
4379
4380 if (auto *attr = inferPointerNullability(
4381 pointerKind, D.getDeclSpec().getTypeSpecTypeLoc(),
4382 D.getDeclSpec().getEndLoc(),
4383 D.getMutableDeclSpec().getAttributes(),
4384 D.getMutableDeclSpec().getAttributePool())) {
4385 T = state.getAttributedType(
4386 createNullabilityAttr(Context, *attr, *inferNullability), T, T);
4387 }
4388 }
4389 }
4390
4391 if (complainAboutMissingNullability == CAMN_Yes &&
4392 T->isArrayType() && !T->getNullability(S.Context) && !isVaList(T) &&
4393 D.isPrototypeContext() &&
4394 !hasOuterPointerLikeChunk(D, D.getNumTypeObjects())) {
4395 checkNullabilityConsistency(S, SimplePointerKind::Array,
4396 D.getDeclSpec().getTypeSpecTypeLoc());
4397 }
4398 }
4399
4400 bool ExpectNoDerefChunk =
4401 state.getCurrentAttributes().hasAttribute(ParsedAttr::AT_NoDeref);
4402
4403 // Walk the DeclTypeInfo, building the recursive type as we go.
4404 // DeclTypeInfos are ordered from the identifier out, which is
4405 // opposite of what we want :).
4406 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) {
4407 unsigned chunkIndex = e - i - 1;
4408 state.setCurrentChunkIndex(chunkIndex);
4409 DeclaratorChunk &DeclType = D.getTypeObject(chunkIndex);
4410 IsQualifiedFunction &= DeclType.Kind == DeclaratorChunk::Paren;
4411 switch (DeclType.Kind) {
4412 case DeclaratorChunk::Paren:
4413 if (i == 0)
4414 warnAboutRedundantParens(S, D, T);
4415 T = S.BuildParenType(T);
4416 break;
4417 case DeclaratorChunk::BlockPointer:
4418 // If blocks are disabled, emit an error.
4419 if (!LangOpts.Blocks)
4420 S.Diag(DeclType.Loc, diag::err_blocks_disable) << LangOpts.OpenCL;
4421
4422 // Handle pointer nullability.
4423 inferPointerNullability(SimplePointerKind::BlockPointer, DeclType.Loc,
4424 DeclType.EndLoc, DeclType.getAttrs(),
4425 state.getDeclarator().getAttributePool());
4426
4427 T = S.BuildBlockPointerType(T, D.getIdentifierLoc(), Name);
4428 if (DeclType.Cls.TypeQuals || LangOpts.OpenCL) {
4429 // OpenCL v2.0, s6.12.5 - Block variable declarations are implicitly
4430 // qualified with const.
4431 if (LangOpts.OpenCL)
4432 DeclType.Cls.TypeQuals |= DeclSpec::TQ_const;
4433 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Cls.TypeQuals);
4434 }
4435 break;
4436 case DeclaratorChunk::Pointer:
4437 // Verify that we're not building a pointer to pointer to function with
4438 // exception specification.
4439 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) {
4440 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec);
4441 D.setInvalidType(true);
4442 // Build the type anyway.
4443 }
4444
4445 // Handle pointer nullability
4446 inferPointerNullability(SimplePointerKind::Pointer, DeclType.Loc,
4447 DeclType.EndLoc, DeclType.getAttrs(),
4448 state.getDeclarator().getAttributePool());
4449
4450 if (LangOpts.ObjC && T->getAs<ObjCObjectType>()) {
4451 T = Context.getObjCObjectPointerType(T);
4452 if (DeclType.Ptr.TypeQuals)
4453 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals);
4454 break;
4455 }
4456
4457 // OpenCL v2.0 s6.9b - Pointer to image/sampler cannot be used.
4458 // OpenCL v2.0 s6.13.16.1 - Pointer to pipe cannot be used.
4459 // OpenCL v2.0 s6.12.5 - Pointers to Blocks are not allowed.
4460 if (LangOpts.OpenCL) {
4461 if (T->isImageType() || T->isSamplerT() || T->isPipeType() ||
4462 T->isBlockPointerType()) {
4463 S.Diag(D.getIdentifierLoc(), diag::err_opencl_pointer_to_type) << T;
4464 D.setInvalidType(true);
4465 }
4466 }
4467
4468 T = S.BuildPointerType(T, DeclType.Loc, Name);
4469 if (DeclType.Ptr.TypeQuals)
4470 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals);
4471 break;
4472 case DeclaratorChunk::Reference: {
4473 // Verify that we're not building a reference to pointer to function with
4474 // exception specification.
4475 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) {
4476 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec);
4477 D.setInvalidType(true);
4478 // Build the type anyway.
4479 }
4480 T = S.BuildReferenceType(T, DeclType.Ref.LValueRef, DeclType.Loc, Name);
4481
4482 if (DeclType.Ref.HasRestrict)
4483 T = S.BuildQualifiedType(T, DeclType.Loc, Qualifiers::Restrict);
4484 break;
4485 }
4486 case DeclaratorChunk::Array: {
4487 // Verify that we're not building an array of pointers to function with
4488 // exception specification.
4489 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) {
4490 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec);
4491 D.setInvalidType(true);
4492 // Build the type anyway.
4493 }
4494 DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr;
4495 Expr *ArraySize = static_cast<Expr*>(ATI.NumElts);
4496 ArrayType::ArraySizeModifier ASM;
4497 if (ATI.isStar)
4498 ASM = ArrayType::Star;
4499 else if (ATI.hasStatic)
4500 ASM = ArrayType::Static;
4501 else
4502 ASM = ArrayType::Normal;
4503 if (ASM == ArrayType::Star && !D.isPrototypeContext()) {
4504 // FIXME: This check isn't quite right: it allows star in prototypes
4505 // for function definitions, and disallows some edge cases detailed
4506 // in http://gcc.gnu.org/ml/gcc-patches/2009-02/msg00133.html
4507 S.Diag(DeclType.Loc, diag::err_array_star_outside_prototype);
4508 ASM = ArrayType::Normal;
4509 D.setInvalidType(true);
4510 }
4511
4512 // C99 6.7.5.2p1: The optional type qualifiers and the keyword static
4513 // shall appear only in a declaration of a function parameter with an
4514 // array type, ...
4515 if (ASM == ArrayType::Static || ATI.TypeQuals) {
4516 if (!(D.isPrototypeContext() ||
4517 D.getContext() == DeclaratorContext::KNRTypeListContext)) {
4518 S.Diag(DeclType.Loc, diag::err_array_static_outside_prototype) <<
4519 (ASM == ArrayType::Static ? "'static'" : "type qualifier");
4520 // Remove the 'static' and the type qualifiers.
4521 if (ASM == ArrayType::Static)
4522 ASM = ArrayType::Normal;
4523 ATI.TypeQuals = 0;
4524 D.setInvalidType(true);
4525 }
4526
4527 // C99 6.7.5.2p1: ... and then only in the outermost array type
4528 // derivation.
4529 if (hasOuterPointerLikeChunk(D, chunkIndex)) {
4530 S.Diag(DeclType.Loc, diag::err_array_static_not_outermost) <<
4531 (ASM == ArrayType::Static ? "'static'" : "type qualifier");
4532 if (ASM == ArrayType::Static)
4533 ASM = ArrayType::Normal;
4534 ATI.TypeQuals = 0;
4535 D.setInvalidType(true);
4536 }
4537 }
4538 const AutoType *AT = T->getContainedAutoType();
4539 // Allow arrays of auto if we are a generic lambda parameter.
4540 // i.e. [](auto (&array)[5]) { return array[0]; }; OK
4541 if (AT &&
4542 D.getContext() != DeclaratorContext::LambdaExprParameterContext) {
4543 // We've already diagnosed this for decltype(auto).
4544 if (!AT->isDecltypeAuto())
4545 S.Diag(DeclType.Loc, diag::err_illegal_decl_array_of_auto)
4546 << getPrintableNameForEntity(Name) << T;
4547 T = QualType();
4548 break;
4549 }
4550
4551 // Array parameters can be marked nullable as well, although it's not
4552 // necessary if they're marked 'static'.
4553 if (complainAboutMissingNullability == CAMN_Yes &&
4554 !hasNullabilityAttr(DeclType.getAttrs()) &&
4555 ASM != ArrayType::Static &&
4556 D.isPrototypeContext() &&
4557 !hasOuterPointerLikeChunk(D, chunkIndex)) {
4558 checkNullabilityConsistency(S, SimplePointerKind::Array, DeclType.Loc);
4559 }
4560
4561 T = S.BuildArrayType(T, ASM, ArraySize, ATI.TypeQuals,
4562 SourceRange(DeclType.Loc, DeclType.EndLoc), Name);
4563 break;
4564 }
4565 case DeclaratorChunk::Function: {
4566 // If the function declarator has a prototype (i.e. it is not () and
4567 // does not have a K&R-style identifier list), then the arguments are part
4568 // of the type, otherwise the argument list is ().
4569 DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun;
4570 IsQualifiedFunction =
4571 FTI.hasMethodTypeQualifiers() || FTI.hasRefQualifier();
4572
4573 // Check for auto functions and trailing return type and adjust the
4574 // return type accordingly.
4575 if (!D.isInvalidType()) {
4576 // trailing-return-type is only required if we're declaring a function,
4577 // and not, for instance, a pointer to a function.
4578 if (D.getDeclSpec().hasAutoTypeSpec() &&
4579 !FTI.hasTrailingReturnType() && chunkIndex == 0) {
4580 if (!S.getLangOpts().CPlusPlus14) {
4581 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(),
4582 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto
4583 ? diag::err_auto_missing_trailing_return
4584 : diag::err_deduced_return_type);
4585 T = Context.IntTy;
4586 D.setInvalidType(true);
4587 } else {
4588 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(),
4589 diag::warn_cxx11_compat_deduced_return_type);
4590 }
4591 } else if (FTI.hasTrailingReturnType()) {
4592 // T must be exactly 'auto' at this point. See CWG issue 681.
4593 if (isa<ParenType>(T)) {
4594 S.Diag(D.getBeginLoc(), diag::err_trailing_return_in_parens)
4595 << T << D.getSourceRange();
4596 D.setInvalidType(true);
4597 } else if (D.getName().getKind() ==
4598 UnqualifiedIdKind::IK_DeductionGuideName) {
4599 if (T != Context.DependentTy) {
4600 S.Diag(D.getDeclSpec().getBeginLoc(),
4601 diag::err_deduction_guide_with_complex_decl)
4602 << D.getSourceRange();
4603 D.setInvalidType(true);
4604 }
4605 } else if (D.getContext() != DeclaratorContext::LambdaExprContext &&
4606 (T.hasQualifiers() || !isa<AutoType>(T) ||
4607 cast<AutoType>(T)->getKeyword() !=
4608 AutoTypeKeyword::Auto)) {
4609 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(),
4610 diag::err_trailing_return_without_auto)
4611 << T << D.getDeclSpec().getSourceRange();
4612 D.setInvalidType(true);
4613 }
4614 T = S.GetTypeFromParser(FTI.getTrailingReturnType(), &TInfo);
4615 if (T.isNull()) {
4616 // An error occurred parsing the trailing return type.
4617 T = Context.IntTy;
4618 D.setInvalidType(true);
4619 }
4620 } else {
4621 // This function type is not the type of the entity being declared,
4622 // so checking the 'auto' is not the responsibility of this chunk.
4623 }
4624 }
4625
4626 // C99 6.7.5.3p1: The return type may not be a function or array type.
4627 // For conversion functions, we'll diagnose this particular error later.
4628 if (!D.isInvalidType() && (T->isArrayType() || T->isFunctionType()) &&
4629 (D.getName().getKind() !=
4630 UnqualifiedIdKind::IK_ConversionFunctionId)) {
4631 unsigned diagID = diag::err_func_returning_array_function;
4632 // Last processing chunk in block context means this function chunk
4633 // represents the block.
4634 if (chunkIndex == 0 &&
4635 D.getContext() == DeclaratorContext::BlockLiteralContext)
4636 diagID = diag::err_block_returning_array_function;
4637 S.Diag(DeclType.Loc, diagID) << T->isFunctionType() << T;
4638 T = Context.IntTy;
4639 D.setInvalidType(true);
4640 }
4641
4642 // Do not allow returning half FP value.
4643 // FIXME: This really should be in BuildFunctionType.
4644 if (T->isHalfType()) {
4645 if (S.getLangOpts().OpenCL) {
4646 if (!S.getOpenCLOptions().isEnabled("cl_khr_fp16")) {
4647 S.Diag(D.getIdentifierLoc(), diag::err_opencl_invalid_return)
4648 << T << 0 /*pointer hint*/;
4649 D.setInvalidType(true);
4650 }
4651 } else if (!S.getLangOpts().HalfArgsAndReturns) {
4652 S.Diag(D.getIdentifierLoc(),
4653 diag::err_parameters_retval_cannot_have_fp16_type) << 1;
4654 D.setInvalidType(true);
4655 }
4656 }
4657
4658 if (LangOpts.OpenCL) {
4659 // OpenCL v2.0 s6.12.5 - A block cannot be the return value of a
4660 // function.
4661 if (T->isBlockPointerType() || T->isImageType() || T->isSamplerT() ||
4662 T->isPipeType()) {
4663 S.Diag(D.getIdentifierLoc(), diag::err_opencl_invalid_return)
4664 << T << 1 /*hint off*/;
4665 D.setInvalidType(true);
4666 }
4667 // OpenCL doesn't support variadic functions and blocks
4668 // (s6.9.e and s6.12.5 OpenCL v2.0) except for printf.
4669 // We also allow here any toolchain reserved identifiers.
4670 if (FTI.isVariadic &&
4671 !(D.getIdentifier() &&
4672 ((D.getIdentifier()->getName() == "printf" &&
4673 (LangOpts.OpenCLCPlusPlus || LangOpts.OpenCLVersion >= 120)) ||
4674 D.getIdentifier()->getName().startswith("__")))) {
4675 S.Diag(D.getIdentifierLoc(), diag::err_opencl_variadic_function);
4676 D.setInvalidType(true);
4677 }
4678 }
4679
4680 // Methods cannot return interface types. All ObjC objects are
4681 // passed by reference.
4682 if (T->isObjCObjectType()) {
4683 SourceLocation DiagLoc, FixitLoc;
4684 if (TInfo) {
4685 DiagLoc = TInfo->getTypeLoc().getBeginLoc();
4686 FixitLoc = S.getLocForEndOfToken(TInfo->getTypeLoc().getEndLoc());
4687 } else {
4688 DiagLoc = D.getDeclSpec().getTypeSpecTypeLoc();
4689 FixitLoc = S.getLocForEndOfToken(D.getDeclSpec().getEndLoc());
4690 }
4691 S.Diag(DiagLoc, diag::err_object_cannot_be_passed_returned_by_value)
4692 << 0 << T
4693 << FixItHint::CreateInsertion(FixitLoc, "*");
4694
4695 T = Context.getObjCObjectPointerType(T);
4696 if (TInfo) {
4697 TypeLocBuilder TLB;
4698 TLB.pushFullCopy(TInfo->getTypeLoc());
4699 ObjCObjectPointerTypeLoc TLoc = TLB.push<ObjCObjectPointerTypeLoc>(T);
4700 TLoc.setStarLoc(FixitLoc);
4701 TInfo = TLB.getTypeSourceInfo(Context, T);
4702 }
4703
4704 D.setInvalidType(true);
4705 }
4706
4707 // cv-qualifiers on return types are pointless except when the type is a
4708 // class type in C++.
4709 if ((T.getCVRQualifiers() || T->isAtomicType()) &&
4710 !(S.getLangOpts().CPlusPlus &&
4711 (T->isDependentType() || T->isRecordType()))) {
4712 if (T->isVoidType() && !S.getLangOpts().CPlusPlus &&
4713 D.getFunctionDefinitionKind() == FDK_Definition) {
4714 // [6.9.1/3] qualified void return is invalid on a C
4715 // function definition. Apparently ok on declarations and
4716 // in C++ though (!)
4717 S.Diag(DeclType.Loc, diag::err_func_returning_qualified_void) << T;
4718 } else
4719 diagnoseRedundantReturnTypeQualifiers(S, T, D, chunkIndex);
4720
4721 // C++2a [dcl.fct]p12:
4722 // A volatile-qualified return type is deprecated
4723 if (T.isVolatileQualified() && S.getLangOpts().CPlusPlus2a)
4724 S.Diag(DeclType.Loc, diag::warn_deprecated_volatile_return) << T;
4725 }
4726
4727 // Objective-C ARC ownership qualifiers are ignored on the function
4728 // return type (by type canonicalization). Complain if this attribute
4729 // was written here.
4730 if (T.getQualifiers().hasObjCLifetime()) {
4731 SourceLocation AttrLoc;
4732 if (chunkIndex + 1 < D.getNumTypeObjects()) {
4733 DeclaratorChunk ReturnTypeChunk = D.getTypeObject(chunkIndex + 1);
4734 for (const ParsedAttr &AL : ReturnTypeChunk.getAttrs()) {
4735 if (AL.getKind() == ParsedAttr::AT_ObjCOwnership) {
4736 AttrLoc = AL.getLoc();
4737 break;
4738 }
4739 }
4740 }
4741 if (AttrLoc.isInvalid()) {
4742 for (const ParsedAttr &AL : D.getDeclSpec().getAttributes()) {
4743 if (AL.getKind() == ParsedAttr::AT_ObjCOwnership) {
4744 AttrLoc = AL.getLoc();
4745 break;
4746 }
4747 }
4748 }
4749
4750 if (AttrLoc.isValid()) {
4751 // The ownership attributes are almost always written via
4752 // the predefined
4753 // __strong/__weak/__autoreleasing/__unsafe_unretained.
4754 if (AttrLoc.isMacroID())
4755 AttrLoc =
4756 S.SourceMgr.getImmediateExpansionRange(AttrLoc).getBegin();
4757
4758 S.Diag(AttrLoc, diag::warn_arc_lifetime_result_type)
4759 << T.getQualifiers().getObjCLifetime();
4760 }
4761 }
4762
4763 if (LangOpts.CPlusPlus && D.getDeclSpec().hasTagDefinition()) {
4764 // C++ [dcl.fct]p6:
4765 // Types shall not be defined in return or parameter types.
4766 TagDecl *Tag = cast<TagDecl>(D.getDeclSpec().getRepAsDecl());
4767 S.Diag(Tag->getLocation(), diag::err_type_defined_in_result_type)
4768 << Context.getTypeDeclType(Tag);
4769 }
4770
4771 // Exception specs are not allowed in typedefs. Complain, but add it
4772 // anyway.
4773 if (IsTypedefName && FTI.getExceptionSpecType() && !LangOpts.CPlusPlus17)
4774 S.Diag(FTI.getExceptionSpecLocBeg(),
4775 diag::err_exception_spec_in_typedef)
4776 << (D.getContext() == DeclaratorContext::AliasDeclContext ||
4777 D.getContext() == DeclaratorContext::AliasTemplateContext);
4778
4779 // If we see "T var();" or "T var(T());" at block scope, it is probably
4780 // an attempt to initialize a variable, not a function declaration.
4781 if (FTI.isAmbiguous)
4782 warnAboutAmbiguousFunction(S, D, DeclType, T);
4783
4784 FunctionType::ExtInfo EI(
4785 getCCForDeclaratorChunk(S, D, DeclType.getAttrs(), FTI, chunkIndex));
4786
4787 if (!FTI.NumParams && !FTI.isVariadic && !LangOpts.CPlusPlus
4788 && !LangOpts.OpenCL) {
4789 // Simple void foo(), where the incoming T is the result type.
4790 T = Context.getFunctionNoProtoType(T, EI);
4791 } else {
4792 // We allow a zero-parameter variadic function in C if the
4793 // function is marked with the "overloadable" attribute. Scan
4794 // for this attribute now.
4795 if (!FTI.NumParams && FTI.isVariadic && !LangOpts.CPlusPlus)
4796 if (!D.getAttributes().hasAttribute(ParsedAttr::AT_Overloadable))
4797 S.Diag(FTI.getEllipsisLoc(), diag::err_ellipsis_first_param);
4798
4799 if (FTI.NumParams && FTI.Params[0].Param == nullptr) {
4800 // C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function
4801 // definition.
4802 S.Diag(FTI.Params[0].IdentLoc,
4803 diag::err_ident_list_in_fn_declaration);
4804 D.setInvalidType(true);
4805 // Recover by creating a K&R-style function type.
4806 T = Context.getFunctionNoProtoType(T, EI);
4807 break;
4808 }
4809
4810 FunctionProtoType::ExtProtoInfo EPI;
4811 EPI.ExtInfo = EI;
4812 EPI.Variadic = FTI.isVariadic;
4813 EPI.EllipsisLoc = FTI.getEllipsisLoc();
4814 EPI.HasTrailingReturn = FTI.hasTrailingReturnType();
4815 EPI.TypeQuals.addCVRUQualifiers(
4816 FTI.MethodQualifiers ? FTI.MethodQualifiers->getTypeQualifiers()
4817 : 0);
4818 EPI.RefQualifier = !FTI.hasRefQualifier()? RQ_None
4819 : FTI.RefQualifierIsLValueRef? RQ_LValue
4820 : RQ_RValue;
4821
4822 // Otherwise, we have a function with a parameter list that is
4823 // potentially variadic.
4824 SmallVector<QualType, 16> ParamTys;
4825 ParamTys.reserve(FTI.NumParams);
4826
4827 SmallVector<FunctionProtoType::ExtParameterInfo, 16>
4828 ExtParameterInfos(FTI.NumParams);
4829 bool HasAnyInterestingExtParameterInfos = false;
4830
4831 for (unsigned i = 0, e = FTI.NumParams; i != e; ++i) {
4832 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.Params[i].Param);
4833 QualType ParamTy = Param->getType();
4834 assert(!ParamTy.isNull() && "Couldn't parse type?")((!ParamTy.isNull() && "Couldn't parse type?") ? static_cast
<void> (0) : __assert_fail ("!ParamTy.isNull() && \"Couldn't parse type?\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 4834, __PRETTY_FUNCTION__))
;
4835
4836 // Look for 'void'. void is allowed only as a single parameter to a
4837 // function with no other parameters (C99 6.7.5.3p10). We record
4838 // int(void) as a FunctionProtoType with an empty parameter list.
4839 if (ParamTy->isVoidType()) {
4840 // If this is something like 'float(int, void)', reject it. 'void'
4841 // is an incomplete type (C99 6.2.5p19) and function decls cannot
4842 // have parameters of incomplete type.
4843 if (FTI.NumParams != 1 || FTI.isVariadic) {
4844 S.Diag(DeclType.Loc, diag::err_void_only_param);
4845 ParamTy = Context.IntTy;
4846 Param->setType(ParamTy);
4847 } else if (FTI.Params[i].Ident) {
4848 // Reject, but continue to parse 'int(void abc)'.
4849 S.Diag(FTI.Params[i].IdentLoc, diag::err_param_with_void_type);
4850 ParamTy = Context.IntTy;
4851 Param->setType(ParamTy);
4852 } else {
4853 // Reject, but continue to parse 'float(const void)'.
4854 if (ParamTy.hasQualifiers())
4855 S.Diag(DeclType.Loc, diag::err_void_param_qualified);
4856
4857 // Do not add 'void' to the list.
4858 break;
4859 }
4860 } else if (ParamTy->isHalfType()) {
4861 // Disallow half FP parameters.
4862 // FIXME: This really should be in BuildFunctionType.
4863 if (S.getLangOpts().OpenCL) {
4864 if (!S.getOpenCLOptions().isEnabled("cl_khr_fp16")) {
4865 S.Diag(Param->getLocation(),
4866 diag::err_opencl_half_param) << ParamTy;
4867 D.setInvalidType();
4868 Param->setInvalidDecl();
4869 }
4870 } else if (!S.getLangOpts().HalfArgsAndReturns) {
4871 S.Diag(Param->getLocation(),
4872 diag::err_parameters_retval_cannot_have_fp16_type) << 0;
4873 D.setInvalidType();
4874 }
4875 } else if (!FTI.hasPrototype) {
4876 if (ParamTy->isPromotableIntegerType()) {
4877 ParamTy = Context.getPromotedIntegerType(ParamTy);
4878 Param->setKNRPromoted(true);
4879 } else if (const BuiltinType* BTy = ParamTy->getAs<BuiltinType>()) {
4880 if (BTy->getKind() == BuiltinType::Float) {
4881 ParamTy = Context.DoubleTy;
4882 Param->setKNRPromoted(true);
4883 }
4884 }
4885 }
4886
4887 if (LangOpts.ObjCAutoRefCount && Param->hasAttr<NSConsumedAttr>()) {
4888 ExtParameterInfos[i] = ExtParameterInfos[i].withIsConsumed(true);
4889 HasAnyInterestingExtParameterInfos = true;
4890 }
4891
4892 if (auto attr = Param->getAttr<ParameterABIAttr>()) {
4893 ExtParameterInfos[i] =
4894 ExtParameterInfos[i].withABI(attr->getABI());
4895 HasAnyInterestingExtParameterInfos = true;
4896 }
4897
4898 if (Param->hasAttr<PassObjectSizeAttr>()) {
4899 ExtParameterInfos[i] = ExtParameterInfos[i].withHasPassObjectSize();
4900 HasAnyInterestingExtParameterInfos = true;
4901 }
4902
4903 if (Param->hasAttr<NoEscapeAttr>()) {
4904 ExtParameterInfos[i] = ExtParameterInfos[i].withIsNoEscape(true);
4905 HasAnyInterestingExtParameterInfos = true;
4906 }
4907
4908 ParamTys.push_back(ParamTy);
4909 }
4910
4911 if (HasAnyInterestingExtParameterInfos) {
4912 EPI.ExtParameterInfos = ExtParameterInfos.data();
4913 checkExtParameterInfos(S, ParamTys, EPI,
4914 [&](unsigned i) { return FTI.Params[i].Param->getLocation(); });
4915 }
4916
4917 SmallVector<QualType, 4> Exceptions;
4918 SmallVector<ParsedType, 2> DynamicExceptions;
4919 SmallVector<SourceRange, 2> DynamicExceptionRanges;
4920 Expr *NoexceptExpr = nullptr;
4921
4922 if (FTI.getExceptionSpecType() == EST_Dynamic) {
4923 // FIXME: It's rather inefficient to have to split into two vectors
4924 // here.
4925 unsigned N = FTI.getNumExceptions();
4926 DynamicExceptions.reserve(N);
4927 DynamicExceptionRanges.reserve(N);
4928 for (unsigned I = 0; I != N; ++I) {
4929 DynamicExceptions.push_back(FTI.Exceptions[I].Ty);
4930 DynamicExceptionRanges.push_back(FTI.Exceptions[I].Range);
4931 }
4932 } else if (isComputedNoexcept(FTI.getExceptionSpecType())) {
4933 NoexceptExpr = FTI.NoexceptExpr;
4934 }
4935
4936 S.checkExceptionSpecification(D.isFunctionDeclarationContext(),
4937 FTI.getExceptionSpecType(),
4938 DynamicExceptions,
4939 DynamicExceptionRanges,
4940 NoexceptExpr,
4941 Exceptions,
4942 EPI.ExceptionSpec);
4943
4944 // FIXME: Set address space from attrs for C++ mode here.
4945 // OpenCLCPlusPlus: A class member function has an address space.
4946 auto IsClassMember = [&]() {
4947 return (!state.getDeclarator().getCXXScopeSpec().isEmpty() &&
4948 state.getDeclarator()
4949 .getCXXScopeSpec()
4950 .getScopeRep()
4951 ->getKind() == NestedNameSpecifier::TypeSpec) ||
4952 state.getDeclarator().getContext() ==
4953 DeclaratorContext::MemberContext ||
4954 state.getDeclarator().getContext() ==
4955 DeclaratorContext::LambdaExprContext;
4956 };
4957
4958 if (state.getSema().getLangOpts().OpenCLCPlusPlus && IsClassMember()) {
4959 LangAS ASIdx = LangAS::Default;
4960 // Take address space attr if any and mark as invalid to avoid adding
4961 // them later while creating QualType.
4962 if (FTI.MethodQualifiers)
4963 for (ParsedAttr &attr : FTI.MethodQualifiers->getAttributes()) {
4964 LangAS ASIdxNew = attr.asOpenCLLangAS();
4965 if (DiagnoseMultipleAddrSpaceAttributes(S, ASIdx, ASIdxNew,
4966 attr.getLoc()))
4967 D.setInvalidType(true);
4968 else
4969 ASIdx = ASIdxNew;
4970 }
4971 // If a class member function's address space is not set, set it to
4972 // __generic.
4973 LangAS AS =
4974 (ASIdx == LangAS::Default ? S.getDefaultCXXMethodAddrSpace()
4975 : ASIdx);
4976 EPI.TypeQuals.addAddressSpace(AS);
4977 }
4978 T = Context.getFunctionType(T, ParamTys, EPI);
4979 }
4980 break;
4981 }
4982 case DeclaratorChunk::MemberPointer: {
4983 // The scope spec must refer to a class, or be dependent.
4984 CXXScopeSpec &SS = DeclType.Mem.Scope();
4985 QualType ClsType;
4986
4987 // Handle pointer nullability.
4988 inferPointerNullability(SimplePointerKind::MemberPointer, DeclType.Loc,
4989 DeclType.EndLoc, DeclType.getAttrs(),
4990 state.getDeclarator().getAttributePool());
4991
4992 if (SS.isInvalid()) {
4993 // Avoid emitting extra errors if we already errored on the scope.
4994 D.setInvalidType(true);
4995 } else if (S.isDependentScopeSpecifier(SS) ||
4996 dyn_cast_or_null<CXXRecordDecl>(S.computeDeclContext(SS))) {
4997 NestedNameSpecifier *NNS = SS.getScopeRep();
4998 NestedNameSpecifier *NNSPrefix = NNS->getPrefix();
4999 switch (NNS->getKind()) {
5000 case NestedNameSpecifier::Identifier:
5001 ClsType = Context.getDependentNameType(ETK_None, NNSPrefix,
5002 NNS->getAsIdentifier());
5003 break;
5004
5005 case NestedNameSpecifier::Namespace:
5006 case NestedNameSpecifier::NamespaceAlias:
5007 case NestedNameSpecifier::Global:
5008 case NestedNameSpecifier::Super:
5009 llvm_unreachable("Nested-name-specifier must name a type")::llvm::llvm_unreachable_internal("Nested-name-specifier must name a type"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 5009)
;
5010
5011 case NestedNameSpecifier::TypeSpec:
5012 case NestedNameSpecifier::TypeSpecWithTemplate:
5013 ClsType = QualType(NNS->getAsType(), 0);
5014 // Note: if the NNS has a prefix and ClsType is a nondependent
5015 // TemplateSpecializationType, then the NNS prefix is NOT included
5016 // in ClsType; hence we wrap ClsType into an ElaboratedType.
5017 // NOTE: in particular, no wrap occurs if ClsType already is an
5018 // Elaborated, DependentName, or DependentTemplateSpecialization.
5019 if (NNSPrefix && isa<TemplateSpecializationType>(NNS->getAsType()))
5020 ClsType = Context.getElaboratedType(ETK_None, NNSPrefix, ClsType);
5021 break;
5022 }
5023 } else {
5024 S.Diag(DeclType.Mem.Scope().getBeginLoc(),
5025 diag::err_illegal_decl_mempointer_in_nonclass)
5026 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name")
5027 << DeclType.Mem.Scope().getRange();
5028 D.setInvalidType(true);
5029 }
5030
5031 if (!ClsType.isNull())
5032 T = S.BuildMemberPointerType(T, ClsType, DeclType.Loc,
5033 D.getIdentifier());
5034 if (T.isNull()) {
5035 T = Context.IntTy;
5036 D.setInvalidType(true);
5037 } else if (DeclType.Mem.TypeQuals) {
5038 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Mem.TypeQuals);
5039 }
5040 break;
5041 }
5042
5043 case DeclaratorChunk::Pipe: {
5044 T = S.BuildReadPipeType(T, DeclType.Loc);
5045 processTypeAttrs(state, T, TAL_DeclSpec,
5046 D.getMutableDeclSpec().getAttributes());
5047 break;
5048 }
5049 }
5050
5051 if (T.isNull()) {
5052 D.setInvalidType(true);
5053 T = Context.IntTy;
5054 }
5055
5056 // See if there are any attributes on this declarator chunk.
5057 processTypeAttrs(state, T, TAL_DeclChunk, DeclType.getAttrs());
5058
5059 if (DeclType.Kind != DeclaratorChunk::Paren) {
5060 if (ExpectNoDerefChunk && !IsNoDerefableChunk(DeclType))
5061 S.Diag(DeclType.Loc, diag::warn_noderef_on_non_pointer_or_array);
5062
5063 ExpectNoDerefChunk = state.didParseNoDeref();
5064 }
5065 }
5066
5067 if (ExpectNoDerefChunk)
5068 S.Diag(state.getDeclarator().getBeginLoc(),
5069 diag::warn_noderef_on_non_pointer_or_array);
5070
5071 // GNU warning -Wstrict-prototypes
5072 // Warn if a function declaration is without a prototype.
5073 // This warning is issued for all kinds of unprototyped function
5074 // declarations (i.e. function type typedef, function pointer etc.)
5075 // C99 6.7.5.3p14:
5076 // The empty list in a function declarator that is not part of a definition
5077 // of that function specifies that no information about the number or types
5078 // of the parameters is supplied.
5079 if (!LangOpts.CPlusPlus && D.getFunctionDefinitionKind() == FDK_Declaration) {
5080 bool IsBlock = false;
5081 for (const DeclaratorChunk &DeclType : D.type_objects()) {
5082 switch (DeclType.Kind) {
5083 case DeclaratorChunk::BlockPointer:
5084 IsBlock = true;
5085 break;
5086 case DeclaratorChunk::Function: {
5087 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun;
5088 // We supress the warning when there's no LParen location, as this
5089 // indicates the declaration was an implicit declaration, which gets
5090 // warned about separately via -Wimplicit-function-declaration.
5091 if (FTI.NumParams == 0 && !FTI.isVariadic && FTI.getLParenLoc().isValid())
5092 S.Diag(DeclType.Loc, diag::warn_strict_prototypes)
5093 << IsBlock
5094 << FixItHint::CreateInsertion(FTI.getRParenLoc(), "void");
5095 IsBlock = false;
5096 break;
5097 }
5098 default:
5099 break;
5100 }
5101 }
5102 }
5103
5104 assert(!T.isNull() && "T must not be null after this point")((!T.isNull() && "T must not be null after this point"
) ? static_cast<void> (0) : __assert_fail ("!T.isNull() && \"T must not be null after this point\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 5104, __PRETTY_FUNCTION__))
;
5105
5106 if (LangOpts.CPlusPlus && T->isFunctionType()) {
5107 const FunctionProtoType *FnTy = T->getAs<FunctionProtoType>();
5108 assert(FnTy && "Why oh why is there not a FunctionProtoType here?")((FnTy && "Why oh why is there not a FunctionProtoType here?"
) ? static_cast<void> (0) : __assert_fail ("FnTy && \"Why oh why is there not a FunctionProtoType here?\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 5108, __PRETTY_FUNCTION__))
;
5109
5110 // C++ 8.3.5p4:
5111 // A cv-qualifier-seq shall only be part of the function type
5112 // for a nonstatic member function, the function type to which a pointer
5113 // to member refers, or the top-level function type of a function typedef
5114 // declaration.
5115 //
5116 // Core issue 547 also allows cv-qualifiers on function types that are
5117 // top-level template type arguments.
5118 enum { NonMember, Member, DeductionGuide } Kind = NonMember;
5119 if (D.getName().getKind() == UnqualifiedIdKind::IK_DeductionGuideName)
5120 Kind = DeductionGuide;
5121 else if (!D.getCXXScopeSpec().isSet()) {
5122 if ((D.getContext() == DeclaratorContext::MemberContext ||
5123 D.getContext() == DeclaratorContext::LambdaExprContext) &&
5124 !D.getDeclSpec().isFriendSpecified())
5125 Kind = Member;
5126 } else {
5127 DeclContext *DC = S.computeDeclContext(D.getCXXScopeSpec());
5128 if (!DC || DC->isRecord())
5129 Kind = Member;
5130 }
5131
5132 // C++11 [dcl.fct]p6 (w/DR1417):
5133 // An attempt to specify a function type with a cv-qualifier-seq or a
5134 // ref-qualifier (including by typedef-name) is ill-formed unless it is:
5135 // - the function type for a non-static member function,
5136 // - the function type to which a pointer to member refers,
5137 // - the top-level function type of a function typedef declaration or
5138 // alias-declaration,
5139 // - the type-id in the default argument of a type-parameter, or
5140 // - the type-id of a template-argument for a type-parameter
5141 //
5142 // FIXME: Checking this here is insufficient. We accept-invalid on:
5143 //
5144 // template<typename T> struct S { void f(T); };
5145 // S<int() const> s;
5146 //
5147 // ... for instance.
5148 if (IsQualifiedFunction &&
5149 !(Kind == Member &&
5150 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) &&
5151 !IsTypedefName &&
5152 D.getContext() != DeclaratorContext::TemplateArgContext &&
5153 D.getContext() != DeclaratorContext::TemplateTypeArgContext) {
5154 SourceLocation Loc = D.getBeginLoc();
5155 SourceRange RemovalRange;
5156 unsigned I;
5157 if (D.isFunctionDeclarator(I)) {
5158 SmallVector<SourceLocation, 4> RemovalLocs;
5159 const DeclaratorChunk &Chunk = D.getTypeObject(I);
5160 assert(Chunk.Kind == DeclaratorChunk::Function)((Chunk.Kind == DeclaratorChunk::Function) ? static_cast<void
> (0) : __assert_fail ("Chunk.Kind == DeclaratorChunk::Function"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 5160, __PRETTY_FUNCTION__))
;
5161
5162 if (Chunk.Fun.hasRefQualifier())
5163 RemovalLocs.push_back(Chunk.Fun.getRefQualifierLoc());
5164
5165 if (Chunk.Fun.hasMethodTypeQualifiers())
5166 Chunk.Fun.MethodQualifiers->forEachQualifier(
5167 [&](DeclSpec::TQ TypeQual, StringRef QualName,
5168 SourceLocation SL) { RemovalLocs.push_back(SL); });
5169
5170 if (!RemovalLocs.empty()) {
5171 llvm::sort(RemovalLocs,
5172 BeforeThanCompare<SourceLocation>(S.getSourceManager()));
5173 RemovalRange = SourceRange(RemovalLocs.front(), RemovalLocs.back());
5174 Loc = RemovalLocs.front();
5175 }
5176 }
5177
5178 S.Diag(Loc, diag::err_invalid_qualified_function_type)
5179 << Kind << D.isFunctionDeclarator() << T
5180 << getFunctionQualifiersAsString(FnTy)
5181 << FixItHint::CreateRemoval(RemovalRange);
5182
5183 // Strip the cv-qualifiers and ref-qualifiers from the type.
5184 FunctionProtoType::ExtProtoInfo EPI = FnTy->getExtProtoInfo();
5185 EPI.TypeQuals.removeCVRQualifiers();
5186 EPI.RefQualifier = RQ_None;
5187
5188 T = Context.getFunctionType(FnTy->getReturnType(), FnTy->getParamTypes(),
5189 EPI);
5190 // Rebuild any parens around the identifier in the function type.
5191 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) {
5192 if (D.getTypeObject(i).Kind != DeclaratorChunk::Paren)
5193 break;
5194 T = S.BuildParenType(T);
5195 }
5196 }
5197 }
5198
5199 // Apply any undistributed attributes from the declarator.
5200 processTypeAttrs(state, T, TAL_DeclName, D.getAttributes());
5201
5202 // Diagnose any ignored type attributes.
5203 state.diagnoseIgnoredTypeAttrs(T);
5204
5205 // C++0x [dcl.constexpr]p9:
5206 // A constexpr specifier used in an object declaration declares the object
5207 // as const.
5208 if (D.getDeclSpec().getConstexprSpecifier() == CSK_constexpr &&
5209 T->isObjectType())
5210 T.addConst();
5211
5212 // C++2a [dcl.fct]p4:
5213 // A parameter with volatile-qualified type is deprecated
5214 if (T.isVolatileQualified() && S.getLangOpts().CPlusPlus2a &&
5215 (D.getContext() == DeclaratorContext::PrototypeContext ||
5216 D.getContext() == DeclaratorContext::LambdaExprParameterContext))
5217 S.Diag(D.getIdentifierLoc(), diag::warn_deprecated_volatile_param) << T;
5218
5219 // If there was an ellipsis in the declarator, the declaration declares a
5220 // parameter pack whose type may be a pack expansion type.
5221 if (D.hasEllipsis()) {
5222 // C++0x [dcl.fct]p13:
5223 // A declarator-id or abstract-declarator containing an ellipsis shall
5224 // only be used in a parameter-declaration. Such a parameter-declaration
5225 // is a parameter pack (14.5.3). [...]
5226 switch (D.getContext()) {
5227 case DeclaratorContext::PrototypeContext:
5228 case DeclaratorContext::LambdaExprParameterContext:
5229 // C++0x [dcl.fct]p13:
5230 // [...] When it is part of a parameter-declaration-clause, the
5231 // parameter pack is a function parameter pack (14.5.3). The type T
5232 // of the declarator-id of the function parameter pack shall contain
5233 // a template parameter pack; each template parameter pack in T is
5234 // expanded by the function parameter pack.
5235 //
5236 // We represent function parameter packs as function parameters whose
5237 // type is a pack expansion.
5238 if (!T->containsUnexpandedParameterPack()) {
5239 S.Diag(D.getEllipsisLoc(),
5240 diag::err_function_parameter_pack_without_parameter_packs)
5241 << T << D.getSourceRange();
5242 D.setEllipsisLoc(SourceLocation());
5243 } else {
5244 T = Context.getPackExpansionType(T, None);
5245 }
5246 break;
5247 case DeclaratorContext::TemplateParamContext:
5248 // C++0x [temp.param]p15:
5249 // If a template-parameter is a [...] is a parameter-declaration that
5250 // declares a parameter pack (8.3.5), then the template-parameter is a
5251 // template parameter pack (14.5.3).
5252 //
5253 // Note: core issue 778 clarifies that, if there are any unexpanded
5254 // parameter packs in the type of the non-type template parameter, then
5255 // it expands those parameter packs.
5256 if (T->containsUnexpandedParameterPack())
5257 T = Context.getPackExpansionType(T, None);
5258 else
5259 S.Diag(D.getEllipsisLoc(),
5260 LangOpts.CPlusPlus11
5261 ? diag::warn_cxx98_compat_variadic_templates
5262 : diag::ext_variadic_templates);
5263 break;
5264
5265 case DeclaratorContext::FileContext:
5266 case DeclaratorContext::KNRTypeListContext:
5267 case DeclaratorContext::ObjCParameterContext: // FIXME: special diagnostic
5268 // here?
5269 case DeclaratorContext::ObjCResultContext: // FIXME: special diagnostic
5270 // here?
5271 case DeclaratorContext::TypeNameContext:
5272 case DeclaratorContext::FunctionalCastContext:
5273 case DeclaratorContext::CXXNewContext:
5274 case DeclaratorContext::AliasDeclContext:
5275 case DeclaratorContext::AliasTemplateContext:
5276 case DeclaratorContext::MemberContext:
5277 case DeclaratorContext::BlockContext:
5278 case DeclaratorContext::ForContext:
5279 case DeclaratorContext::InitStmtContext:
5280 case DeclaratorContext::ConditionContext:
5281 case DeclaratorContext::CXXCatchContext:
5282 case DeclaratorContext::ObjCCatchContext:
5283 case DeclaratorContext::BlockLiteralContext:
5284 case DeclaratorContext::LambdaExprContext:
5285 case DeclaratorContext::ConversionIdContext:
5286 case DeclaratorContext::TrailingReturnContext:
5287 case DeclaratorContext::TrailingReturnVarContext:
5288 case DeclaratorContext::TemplateArgContext:
5289 case DeclaratorContext::TemplateTypeArgContext:
5290 // FIXME: We may want to allow parameter packs in block-literal contexts
5291 // in the future.
5292 S.Diag(D.getEllipsisLoc(),
5293 diag::err_ellipsis_in_declarator_not_parameter);
5294 D.setEllipsisLoc(SourceLocation());
5295 break;
5296 }
5297 }
5298
5299 assert(!T.isNull() && "T must not be null at the end of this function")((!T.isNull() && "T must not be null at the end of this function"
) ? static_cast<void> (0) : __assert_fail ("!T.isNull() && \"T must not be null at the end of this function\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 5299, __PRETTY_FUNCTION__))
;
5300 if (D.isInvalidType())
5301 return Context.getTrivialTypeSourceInfo(T);
5302
5303 return GetTypeSourceInfoForDeclarator(state, T, TInfo);
5304}
5305
5306/// GetTypeForDeclarator - Convert the type for the specified
5307/// declarator to Type instances.
5308///
5309/// The result of this call will never be null, but the associated
5310/// type may be a null type if there's an unrecoverable error.
5311TypeSourceInfo *Sema::GetTypeForDeclarator(Declarator &D, Scope *S) {
5312 // Determine the type of the declarator. Not all forms of declarator
5313 // have a type.
5314
5315 TypeProcessingState state(*this, D);
5316
5317 TypeSourceInfo *ReturnTypeInfo = nullptr;
5318 QualType T = GetDeclSpecTypeForDeclarator(state, ReturnTypeInfo);
5319 if (D.isPrototypeContext() && getLangOpts().ObjCAutoRefCount)
5320 inferARCWriteback(state, T);
5321
5322 return GetFullTypeForDeclarator(state, T, ReturnTypeInfo);
5323}
5324
5325static void transferARCOwnershipToDeclSpec(Sema &S,
5326 QualType &declSpecTy,
5327 Qualifiers::ObjCLifetime ownership) {
5328 if (declSpecTy->isObjCRetainableType() &&
5329 declSpecTy.getObjCLifetime() == Qualifiers::OCL_None) {
5330 Qualifiers qs;
5331 qs.addObjCLifetime(ownership);
5332 declSpecTy = S.Context.getQualifiedType(declSpecTy, qs);
5333 }
5334}
5335
5336static void transferARCOwnershipToDeclaratorChunk(TypeProcessingState &state,
5337 Qualifiers::ObjCLifetime ownership,
5338 unsigned chunkIndex) {
5339 Sema &S = state.getSema();
5340 Declarator &D = state.getDeclarator();
5341
5342 // Look for an explicit lifetime attribute.
5343 DeclaratorChunk &chunk = D.getTypeObject(chunkIndex);
5344 if (chunk.getAttrs().hasAttribute(ParsedAttr::AT_ObjCOwnership))
5345 return;
5346
5347 const char *attrStr = nullptr;
5348 switch (ownership) {
5349 case Qualifiers::OCL_None: llvm_unreachable("no ownership!")::llvm::llvm_unreachable_internal("no ownership!", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 5349)
;
5350 case Qualifiers::OCL_ExplicitNone: attrStr = "none"; break;
5351 case Qualifiers::OCL_Strong: attrStr = "strong"; break;
5352 case Qualifiers::OCL_Weak: attrStr = "weak"; break;
5353 case Qualifiers::OCL_Autoreleasing: attrStr = "autoreleasing"; break;
5354 }
5355
5356 IdentifierLoc *Arg = new (S.Context) IdentifierLoc;
5357 Arg->Ident = &S.Context.Idents.get(attrStr);
5358 Arg->Loc = SourceLocation();
5359
5360 ArgsUnion Args(Arg);
5361
5362 // If there wasn't one, add one (with an invalid source location
5363 // so that we don't make an AttributedType for it).
5364 ParsedAttr *attr = D.getAttributePool().create(
5365 &S.Context.Idents.get("objc_ownership"), SourceLocation(),
5366 /*scope*/ nullptr, SourceLocation(),
5367 /*args*/ &Args, 1, ParsedAttr::AS_GNU);
5368 chunk.getAttrs().addAtEnd(attr);
5369 // TODO: mark whether we did this inference?
5370}
5371
5372/// Used for transferring ownership in casts resulting in l-values.
5373static void transferARCOwnership(TypeProcessingState &state,
5374 QualType &declSpecTy,
5375 Qualifiers::ObjCLifetime ownership) {
5376 Sema &S = state.getSema();
5377 Declarator &D = state.getDeclarator();
5378
5379 int inner = -1;
5380 bool hasIndirection = false;
5381 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) {
5382 DeclaratorChunk &chunk = D.getTypeObject(i);
5383 switch (chunk.Kind) {
5384 case DeclaratorChunk::Paren:
5385 // Ignore parens.
5386 break;
5387
5388 case DeclaratorChunk::Array:
5389 case DeclaratorChunk::Reference:
5390 case DeclaratorChunk::Pointer:
5391 if (inner != -1)
5392 hasIndirection = true;
5393 inner = i;
5394 break;
5395
5396 case DeclaratorChunk::BlockPointer:
5397 if (inner != -1)
5398 transferARCOwnershipToDeclaratorChunk(state, ownership, i);
5399 return;
5400
5401 case DeclaratorChunk::Function:
5402 case DeclaratorChunk::MemberPointer:
5403 case DeclaratorChunk::Pipe:
5404 return;
5405 }
5406 }
5407
5408 if (inner == -1)
5409 return;
5410
5411 DeclaratorChunk &chunk = D.getTypeObject(inner);
5412 if (chunk.Kind == DeclaratorChunk::Pointer) {
5413 if (declSpecTy->isObjCRetainableType())
5414 return transferARCOwnershipToDeclSpec(S, declSpecTy, ownership);
5415 if (declSpecTy->isObjCObjectType() && hasIndirection)
5416 return transferARCOwnershipToDeclaratorChunk(state, ownership, inner);
5417 } else {
5418 assert(chunk.Kind == DeclaratorChunk::Array ||((chunk.Kind == DeclaratorChunk::Array || chunk.Kind == DeclaratorChunk
::Reference) ? static_cast<void> (0) : __assert_fail ("chunk.Kind == DeclaratorChunk::Array || chunk.Kind == DeclaratorChunk::Reference"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 5419, __PRETTY_FUNCTION__))
5419 chunk.Kind == DeclaratorChunk::Reference)((chunk.Kind == DeclaratorChunk::Array || chunk.Kind == DeclaratorChunk
::Reference) ? static_cast<void> (0) : __assert_fail ("chunk.Kind == DeclaratorChunk::Array || chunk.Kind == DeclaratorChunk::Reference"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 5419, __PRETTY_FUNCTION__))
;
5420 return transferARCOwnershipToDeclSpec(S, declSpecTy, ownership);
5421 }
5422}
5423
5424TypeSourceInfo *Sema::GetTypeForDeclaratorCast(Declarator &D, QualType FromTy) {
5425 TypeProcessingState state(*this, D);
5426
5427 TypeSourceInfo *ReturnTypeInfo = nullptr;
5428 QualType declSpecTy = GetDeclSpecTypeForDeclarator(state, ReturnTypeInfo);
5429
5430 if (getLangOpts().ObjC) {
5431 Qualifiers::ObjCLifetime ownership = Context.getInnerObjCOwnership(FromTy);
5432 if (ownership != Qualifiers::OCL_None)
5433 transferARCOwnership(state, declSpecTy, ownership);
5434 }
5435
5436 return GetFullTypeForDeclarator(state, declSpecTy, ReturnTypeInfo);
5437}
5438
5439static void fillAttributedTypeLoc(AttributedTypeLoc TL,
5440 TypeProcessingState &State) {
5441 TL.setAttr(State.takeAttrForAttributedType(TL.getTypePtr()));
5442}
5443
5444namespace {
5445 class TypeSpecLocFiller : public TypeLocVisitor<TypeSpecLocFiller> {
5446 ASTContext &Context;
5447 TypeProcessingState &State;
5448 const DeclSpec &DS;
5449
5450 public:
5451 TypeSpecLocFiller(ASTContext &Context, TypeProcessingState &State,
5452 const DeclSpec &DS)
5453 : Context(Context), State(State), DS(DS) {}
5454
5455 void VisitAttributedTypeLoc(AttributedTypeLoc TL) {
5456 Visit(TL.getModifiedLoc());
5457 fillAttributedTypeLoc(TL, State);
5458 }
5459 void VisitMacroQualifiedTypeLoc(MacroQualifiedTypeLoc TL) {
5460 Visit(TL.getInnerLoc());
5461 TL.setExpansionLoc(
5462 State.getExpansionLocForMacroQualifiedType(TL.getTypePtr()));
5463 }
5464 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) {
5465 Visit(TL.getUnqualifiedLoc());
5466 }
5467 void VisitTypedefTypeLoc(TypedefTypeLoc TL) {
5468 TL.setNameLoc(DS.getTypeSpecTypeLoc());
5469 }
5470 void VisitObjCInterfaceTypeLoc(ObjCInterfaceTypeLoc TL) {
5471 TL.setNameLoc(DS.getTypeSpecTypeLoc());
5472 // FIXME. We should have DS.getTypeSpecTypeEndLoc(). But, it requires
5473 // addition field. What we have is good enough for dispay of location
5474 // of 'fixit' on interface name.
5475 TL.setNameEndLoc(DS.getEndLoc());
5476 }
5477 void VisitObjCObjectTypeLoc(ObjCObjectTypeLoc TL) {
5478 TypeSourceInfo *RepTInfo = nullptr;
5479 Sema::GetTypeFromParser(DS.getRepAsType(), &RepTInfo);
5480 TL.copy(RepTInfo->getTypeLoc());
5481 }
5482 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) {
5483 TypeSourceInfo *RepTInfo = nullptr;
5484 Sema::GetTypeFromParser(DS.getRepAsType(), &RepTInfo);
5485 TL.copy(RepTInfo->getTypeLoc());
5486 }
5487 void VisitTemplateSpecializationTypeLoc(TemplateSpecializationTypeLoc TL) {
5488 TypeSourceInfo *TInfo = nullptr;
5489 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
5490
5491 // If we got no declarator info from previous Sema routines,
5492 // just fill with the typespec loc.
5493 if (!TInfo) {
5494 TL.initialize(Context, DS.getTypeSpecTypeNameLoc());
5495 return;
5496 }
5497
5498 TypeLoc OldTL = TInfo->getTypeLoc();
5499 if (TInfo->getType()->getAs<ElaboratedType>()) {
5500 ElaboratedTypeLoc ElabTL = OldTL.castAs<ElaboratedTypeLoc>();
5501 TemplateSpecializationTypeLoc NamedTL = ElabTL.getNamedTypeLoc()
5502 .castAs<TemplateSpecializationTypeLoc>();
5503 TL.copy(NamedTL);
5504 } else {
5505 TL.copy(OldTL.castAs<TemplateSpecializationTypeLoc>());
5506 assert(TL.getRAngleLoc() == OldTL.castAs<TemplateSpecializationTypeLoc>().getRAngleLoc())((TL.getRAngleLoc() == OldTL.castAs<TemplateSpecializationTypeLoc
>().getRAngleLoc()) ? static_cast<void> (0) : __assert_fail
("TL.getRAngleLoc() == OldTL.castAs<TemplateSpecializationTypeLoc>().getRAngleLoc()"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 5506, __PRETTY_FUNCTION__))
;
5507 }
5508
5509 }
5510 void VisitTypeOfExprTypeLoc(TypeOfExprTypeLoc TL) {
5511 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofExpr)((DS.getTypeSpecType() == DeclSpec::TST_typeofExpr) ? static_cast
<void> (0) : __assert_fail ("DS.getTypeSpecType() == DeclSpec::TST_typeofExpr"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 5511, __PRETTY_FUNCTION__))
;
5512 TL.setTypeofLoc(DS.getTypeSpecTypeLoc());
5513 TL.setParensRange(DS.getTypeofParensRange());
5514 }
5515 void VisitTypeOfTypeLoc(TypeOfTypeLoc TL) {
5516 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofType)((DS.getTypeSpecType() == DeclSpec::TST_typeofType) ? static_cast
<void> (0) : __assert_fail ("DS.getTypeSpecType() == DeclSpec::TST_typeofType"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 5516, __PRETTY_FUNCTION__))
;
5517 TL.setTypeofLoc(DS.getTypeSpecTypeLoc());
5518 TL.setParensRange(DS.getTypeofParensRange());
5519 assert(DS.getRepAsType())((DS.getRepAsType()) ? static_cast<void> (0) : __assert_fail
("DS.getRepAsType()", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 5519, __PRETTY_FUNCTION__))
;
5520 TypeSourceInfo *TInfo = nullptr;
5521 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
5522 TL.setUnderlyingTInfo(TInfo);
5523 }
5524 void VisitUnaryTransformTypeLoc(UnaryTransformTypeLoc TL) {
5525 // FIXME: This holds only because we only have one unary transform.
5526 assert(DS.getTypeSpecType() == DeclSpec::TST_underlyingType)((DS.getTypeSpecType() == DeclSpec::TST_underlyingType) ? static_cast
<void> (0) : __assert_fail ("DS.getTypeSpecType() == DeclSpec::TST_underlyingType"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 5526, __PRETTY_FUNCTION__))
;
5527 TL.setKWLoc(DS.getTypeSpecTypeLoc());
5528 TL.setParensRange(DS.getTypeofParensRange());
5529 assert(DS.getRepAsType())((DS.getRepAsType()) ? static_cast<void> (0) : __assert_fail
("DS.getRepAsType()", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 5529, __PRETTY_FUNCTION__))
;
5530 TypeSourceInfo *TInfo = nullptr;
5531 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
5532 TL.setUnderlyingTInfo(TInfo);
5533 }
5534 void VisitBuiltinTypeLoc(BuiltinTypeLoc TL) {
5535 // By default, use the source location of the type specifier.
5536 TL.setBuiltinLoc(DS.getTypeSpecTypeLoc());
5537 if (TL.needsExtraLocalData()) {
5538 // Set info for the written builtin specifiers.
5539 TL.getWrittenBuiltinSpecs() = DS.getWrittenBuiltinSpecs();
5540 // Try to have a meaningful source location.
5541 if (TL.getWrittenSignSpec() != TSS_unspecified)
5542 TL.expandBuiltinRange(DS.getTypeSpecSignLoc());
5543 if (TL.getWrittenWidthSpec() != TSW_unspecified)
5544 TL.expandBuiltinRange(DS.getTypeSpecWidthRange());
5545 }
5546 }
5547 void VisitElaboratedTypeLoc(ElaboratedTypeLoc TL) {
5548 ElaboratedTypeKeyword Keyword
5549 = TypeWithKeyword::getKeywordForTypeSpec(DS.getTypeSpecType());
5550 if (DS.getTypeSpecType() == TST_typename) {
5551 TypeSourceInfo *TInfo = nullptr;
5552 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
5553 if (TInfo) {
5554 TL.copy(TInfo->getTypeLoc().castAs<ElaboratedTypeLoc>());
5555 return;
5556 }
5557 }
5558 TL.setElaboratedKeywordLoc(Keyword != ETK_None
5559 ? DS.getTypeSpecTypeLoc()
5560 : SourceLocation());
5561 const CXXScopeSpec& SS = DS.getTypeSpecScope();
5562 TL.setQualifierLoc(SS.getWithLocInContext(Context));
5563 Visit(TL.getNextTypeLoc().getUnqualifiedLoc());
5564 }
5565 void VisitDependentNameTypeLoc(DependentNameTypeLoc TL) {
5566 assert(DS.getTypeSpecType() == TST_typename)((DS.getTypeSpecType() == TST_typename) ? static_cast<void
> (0) : __assert_fail ("DS.getTypeSpecType() == TST_typename"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 5566, __PRETTY_FUNCTION__))
;
5567 TypeSourceInfo *TInfo = nullptr;
5568 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
5569 assert(TInfo)((TInfo) ? static_cast<void> (0) : __assert_fail ("TInfo"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 5569, __PRETTY_FUNCTION__))
;
5570 TL.copy(TInfo->getTypeLoc().castAs<DependentNameTypeLoc>());
5571 }
5572 void VisitDependentTemplateSpecializationTypeLoc(
5573 DependentTemplateSpecializationTypeLoc TL) {
5574 assert(DS.getTypeSpecType() == TST_typename)((DS.getTypeSpecType() == TST_typename) ? static_cast<void
> (0) : __assert_fail ("DS.getTypeSpecType() == TST_typename"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 5574, __PRETTY_FUNCTION__))
;
5575 TypeSourceInfo *TInfo = nullptr;
5576 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
5577 assert(TInfo)((TInfo) ? static_cast<void> (0) : __assert_fail ("TInfo"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 5577, __PRETTY_FUNCTION__))
;
5578 TL.copy(
5579 TInfo->getTypeLoc().castAs<DependentTemplateSpecializationTypeLoc>());
5580 }
5581 void VisitTagTypeLoc(TagTypeLoc TL) {
5582 TL.setNameLoc(DS.getTypeSpecTypeNameLoc());
5583 }
5584 void VisitAtomicTypeLoc(AtomicTypeLoc TL) {
5585 // An AtomicTypeLoc can come from either an _Atomic(...) type specifier
5586 // or an _Atomic qualifier.
5587 if (DS.getTypeSpecType() == DeclSpec::TST_atomic) {
5588 TL.setKWLoc(DS.getTypeSpecTypeLoc());
5589 TL.setParensRange(DS.getTypeofParensRange());
5590
5591 TypeSourceInfo *TInfo = nullptr;
5592 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
5593 assert(TInfo)((TInfo) ? static_cast<void> (0) : __assert_fail ("TInfo"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 5593, __PRETTY_FUNCTION__))
;
5594 TL.getValueLoc().initializeFullCopy(TInfo->getTypeLoc());
5595 } else {
5596 TL.setKWLoc(DS.getAtomicSpecLoc());
5597 // No parens, to indicate this was spelled as an _Atomic qualifier.
5598 TL.setParensRange(SourceRange());
5599 Visit(TL.getValueLoc());
5600 }
5601 }
5602
5603 void VisitPipeTypeLoc(PipeTypeLoc TL) {
5604 TL.setKWLoc(DS.getTypeSpecTypeLoc());
5605
5606 TypeSourceInfo *TInfo = nullptr;
5607 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo);
5608 TL.getValueLoc().initializeFullCopy(TInfo->getTypeLoc());
5609 }
5610
5611 void VisitTypeLoc(TypeLoc TL) {
5612 // FIXME: add other typespec types and change this to an assert.
5613 TL.initialize(Context, DS.getTypeSpecTypeLoc());
5614 }
5615 };
5616
5617 class DeclaratorLocFiller : public TypeLocVisitor<DeclaratorLocFiller> {
5618 ASTContext &Context;
5619 TypeProcessingState &State;
5620 const DeclaratorChunk &Chunk;
5621
5622 public:
5623 DeclaratorLocFiller(ASTContext &Context, TypeProcessingState &State,
5624 const DeclaratorChunk &Chunk)
5625 : Context(Context), State(State), Chunk(Chunk) {}
5626
5627 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) {
5628 llvm_unreachable("qualified type locs not expected here!")::llvm::llvm_unreachable_internal("qualified type locs not expected here!"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 5628)
;
5629 }
5630 void VisitDecayedTypeLoc(DecayedTypeLoc TL) {
5631 llvm_unreachable("decayed type locs not expected here!")::llvm::llvm_unreachable_internal("decayed type locs not expected here!"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 5631)
;
5632 }
5633
5634 void VisitAttributedTypeLoc(AttributedTypeLoc TL) {
5635 fillAttributedTypeLoc(TL, State);
5636 }
5637 void VisitAdjustedTypeLoc(AdjustedTypeLoc TL) {
5638 // nothing
5639 }
5640 void VisitBlockPointerTypeLoc(BlockPointerTypeLoc TL) {
5641 assert(Chunk.Kind == DeclaratorChunk::BlockPointer)((Chunk.Kind == DeclaratorChunk::BlockPointer) ? static_cast<
void> (0) : __assert_fail ("Chunk.Kind == DeclaratorChunk::BlockPointer"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 5641, __PRETTY_FUNCTION__))
;
5642 TL.setCaretLoc(Chunk.Loc);
5643 }
5644 void VisitPointerTypeLoc(PointerTypeLoc TL) {
5645 assert(Chunk.Kind == DeclaratorChunk::Pointer)((Chunk.Kind == DeclaratorChunk::Pointer) ? static_cast<void
> (0) : __assert_fail ("Chunk.Kind == DeclaratorChunk::Pointer"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 5645, __PRETTY_FUNCTION__))
;
5646 TL.setStarLoc(Chunk.Loc);
5647 }
5648 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) {
5649 assert(Chunk.Kind == DeclaratorChunk::Pointer)((Chunk.Kind == DeclaratorChunk::Pointer) ? static_cast<void
> (0) : __assert_fail ("Chunk.Kind == DeclaratorChunk::Pointer"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 5649, __PRETTY_FUNCTION__))
;
5650 TL.setStarLoc(Chunk.Loc);
5651 }
5652 void VisitMemberPointerTypeLoc(MemberPointerTypeLoc TL) {
5653 assert(Chunk.Kind == DeclaratorChunk::MemberPointer)((Chunk.Kind == DeclaratorChunk::MemberPointer) ? static_cast
<void> (0) : __assert_fail ("Chunk.Kind == DeclaratorChunk::MemberPointer"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 5653, __PRETTY_FUNCTION__))
;
5654 const CXXScopeSpec& SS = Chunk.Mem.Scope();
5655 NestedNameSpecifierLoc NNSLoc = SS.getWithLocInContext(Context);
5656
5657 const Type* ClsTy = TL.getClass();
5658 QualType ClsQT = QualType(ClsTy, 0);
5659 TypeSourceInfo *ClsTInfo = Context.CreateTypeSourceInfo(ClsQT, 0);
5660 // Now copy source location info into the type loc component.
5661 TypeLoc ClsTL = ClsTInfo->getTypeLoc();
5662 switch (NNSLoc.getNestedNameSpecifier()->getKind()) {
5663 case NestedNameSpecifier::Identifier:
5664 assert(isa<DependentNameType>(ClsTy) && "Unexpected TypeLoc")((isa<DependentNameType>(ClsTy) && "Unexpected TypeLoc"
) ? static_cast<void> (0) : __assert_fail ("isa<DependentNameType>(ClsTy) && \"Unexpected TypeLoc\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 5664, __PRETTY_FUNCTION__))
;
5665 {
5666 DependentNameTypeLoc DNTLoc = ClsTL.castAs<DependentNameTypeLoc>();
5667 DNTLoc.setElaboratedKeywordLoc(SourceLocation());
5668 DNTLoc.setQualifierLoc(NNSLoc.getPrefix());
5669 DNTLoc.setNameLoc(NNSLoc.getLocalBeginLoc());
5670 }
5671 break;
5672
5673 case NestedNameSpecifier::TypeSpec:
5674 case NestedNameSpecifier::TypeSpecWithTemplate:
5675 if (isa<ElaboratedType>(ClsTy)) {
5676 ElaboratedTypeLoc ETLoc = ClsTL.castAs<ElaboratedTypeLoc>();
5677 ETLoc.setElaboratedKeywordLoc(SourceLocation());
5678 ETLoc.setQualifierLoc(NNSLoc.getPrefix());
5679 TypeLoc NamedTL = ETLoc.getNamedTypeLoc();
5680 NamedTL.initializeFullCopy(NNSLoc.getTypeLoc());
5681 } else {
5682 ClsTL.initializeFullCopy(NNSLoc.getTypeLoc());
5683 }
5684 break;
5685
5686 case NestedNameSpecifier::Namespace:
5687 case NestedNameSpecifier::NamespaceAlias:
5688 case NestedNameSpecifier::Global:
5689 case NestedNameSpecifier::Super:
5690 llvm_unreachable("Nested-name-specifier must name a type")::llvm::llvm_unreachable_internal("Nested-name-specifier must name a type"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 5690)
;
5691 }
5692
5693 // Finally fill in MemberPointerLocInfo fields.
5694 TL.setStarLoc(Chunk.Loc);
5695 TL.setClassTInfo(ClsTInfo);
5696 }
5697 void VisitLValueReferenceTypeLoc(LValueReferenceTypeLoc TL) {
5698 assert(Chunk.Kind == DeclaratorChunk::Reference)((Chunk.Kind == DeclaratorChunk::Reference) ? static_cast<
void> (0) : __assert_fail ("Chunk.Kind == DeclaratorChunk::Reference"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 5698, __PRETTY_FUNCTION__))
;
5699 // 'Amp' is misleading: this might have been originally
5700 /// spelled with AmpAmp.
5701 TL.setAmpLoc(Chunk.Loc);
5702 }
5703 void VisitRValueReferenceTypeLoc(RValueReferenceTypeLoc TL) {
5704 assert(Chunk.Kind == DeclaratorChunk::Reference)((Chunk.Kind == DeclaratorChunk::Reference) ? static_cast<
void> (0) : __assert_fail ("Chunk.Kind == DeclaratorChunk::Reference"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 5704, __PRETTY_FUNCTION__))
;
5705 assert(!Chunk.Ref.LValueRef)((!Chunk.Ref.LValueRef) ? static_cast<void> (0) : __assert_fail
("!Chunk.Ref.LValueRef", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 5705, __PRETTY_FUNCTION__))
;
5706 TL.setAmpAmpLoc(Chunk.Loc);
5707 }
5708 void VisitArrayTypeLoc(ArrayTypeLoc TL) {
5709 assert(Chunk.Kind == DeclaratorChunk::Array)((Chunk.Kind == DeclaratorChunk::Array) ? static_cast<void
> (0) : __assert_fail ("Chunk.Kind == DeclaratorChunk::Array"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 5709, __PRETTY_FUNCTION__))
;
5710 TL.setLBracketLoc(Chunk.Loc);
5711 TL.setRBracketLoc(Chunk.EndLoc);
5712 TL.setSizeExpr(static_cast<Expr*>(Chunk.Arr.NumElts));
5713 }
5714 void VisitFunctionTypeLoc(FunctionTypeLoc TL) {
5715 assert(Chunk.Kind == DeclaratorChunk::Function)((Chunk.Kind == DeclaratorChunk::Function) ? static_cast<void
> (0) : __assert_fail ("Chunk.Kind == DeclaratorChunk::Function"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 5715, __PRETTY_FUNCTION__))
;
5716 TL.setLocalRangeBegin(Chunk.Loc);
5717 TL.setLocalRangeEnd(Chunk.EndLoc);
5718
5719 const DeclaratorChunk::FunctionTypeInfo &FTI = Chunk.Fun;
5720 TL.setLParenLoc(FTI.getLParenLoc());
5721 TL.setRParenLoc(FTI.getRParenLoc());
5722 for (unsigned i = 0, e = TL.getNumParams(), tpi = 0; i != e; ++i) {
5723 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.Params[i].Param);
5724 TL.setParam(tpi++, Param);
5725 }
5726 TL.setExceptionSpecRange(FTI.getExceptionSpecRange());
5727 }
5728 void VisitParenTypeLoc(ParenTypeLoc TL) {
5729 assert(Chunk.Kind == DeclaratorChunk::Paren)((Chunk.Kind == DeclaratorChunk::Paren) ? static_cast<void
> (0) : __assert_fail ("Chunk.Kind == DeclaratorChunk::Paren"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 5729, __PRETTY_FUNCTION__))
;
5730 TL.setLParenLoc(Chunk.Loc);
5731 TL.setRParenLoc(Chunk.EndLoc);
5732 }
5733 void VisitPipeTypeLoc(PipeTypeLoc TL) {
5734 assert(Chunk.Kind == DeclaratorChunk::Pipe)((Chunk.Kind == DeclaratorChunk::Pipe) ? static_cast<void>
(0) : __assert_fail ("Chunk.Kind == DeclaratorChunk::Pipe", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 5734, __PRETTY_FUNCTION__))
;
5735 TL.setKWLoc(Chunk.Loc);
5736 }
5737 void VisitMacroQualifiedTypeLoc(MacroQualifiedTypeLoc TL) {
5738 TL.setExpansionLoc(Chunk.Loc);
5739 }
5740
5741 void VisitTypeLoc(TypeLoc TL) {
5742 llvm_unreachable("unsupported TypeLoc kind in declarator!")::llvm::llvm_unreachable_internal("unsupported TypeLoc kind in declarator!"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 5742)
;
5743 }
5744 };
5745} // end anonymous namespace
5746
5747static void fillAtomicQualLoc(AtomicTypeLoc ATL, const DeclaratorChunk &Chunk) {
5748 SourceLocation Loc;
5749 switch (Chunk.Kind) {
5750 case DeclaratorChunk::Function:
5751 case DeclaratorChunk::Array:
5752 case DeclaratorChunk::Paren:
5753 case DeclaratorChunk::Pipe:
5754 llvm_unreachable("cannot be _Atomic qualified")::llvm::llvm_unreachable_internal("cannot be _Atomic qualified"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 5754)
;
5755
5756 case DeclaratorChunk::Pointer:
5757 Loc = SourceLocation::getFromRawEncoding(Chunk.Ptr.AtomicQualLoc);
5758 break;
5759
5760 case DeclaratorChunk::BlockPointer:
5761 case DeclaratorChunk::Reference:
5762 case DeclaratorChunk::MemberPointer:
5763 // FIXME: Provide a source location for the _Atomic keyword.
5764 break;
5765 }
5766
5767 ATL.setKWLoc(Loc);
5768 ATL.setParensRange(SourceRange());
5769}
5770
5771static void
5772fillDependentAddressSpaceTypeLoc(DependentAddressSpaceTypeLoc DASTL,
5773 const ParsedAttributesView &Attrs) {
5774 for (const ParsedAttr &AL : Attrs) {
5775 if (AL.getKind() == ParsedAttr::AT_AddressSpace) {
5776 DASTL.setAttrNameLoc(AL.getLoc());
5777 DASTL.setAttrExprOperand(AL.getArgAsExpr(0));
5778 DASTL.setAttrOperandParensRange(SourceRange());
5779 return;
5780 }
5781 }
5782
5783 llvm_unreachable(::llvm::llvm_unreachable_internal("no address_space attribute found at the expected location!"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 5784)
5784 "no address_space attribute found at the expected location!")::llvm::llvm_unreachable_internal("no address_space attribute found at the expected location!"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 5784)
;
5785}
5786
5787/// Create and instantiate a TypeSourceInfo with type source information.
5788///
5789/// \param T QualType referring to the type as written in source code.
5790///
5791/// \param ReturnTypeInfo For declarators whose return type does not show
5792/// up in the normal place in the declaration specifiers (such as a C++
5793/// conversion function), this pointer will refer to a type source information
5794/// for that return type.
5795static TypeSourceInfo *
5796GetTypeSourceInfoForDeclarator(TypeProcessingState &State,
5797 QualType T, TypeSourceInfo *ReturnTypeInfo) {
5798 Sema &S = State.getSema();
5799 Declarator &D = State.getDeclarator();
5800
5801 TypeSourceInfo *TInfo = S.Context.CreateTypeSourceInfo(T);
5802 UnqualTypeLoc CurrTL = TInfo->getTypeLoc().getUnqualifiedLoc();
5803
5804 // Handle parameter packs whose type is a pack expansion.
5805 if (isa<PackExpansionType>(T)) {
5806 CurrTL.castAs<PackExpansionTypeLoc>().setEllipsisLoc(D.getEllipsisLoc());
5807 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc();
5808 }
5809
5810 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) {
5811 // An AtomicTypeLoc might be produced by an atomic qualifier in this
5812 // declarator chunk.
5813 if (AtomicTypeLoc ATL = CurrTL.getAs<AtomicTypeLoc>()) {
5814 fillAtomicQualLoc(ATL, D.getTypeObject(i));
5815 CurrTL = ATL.getValueLoc().getUnqualifiedLoc();
5816 }
5817
5818 while (MacroQualifiedTypeLoc TL = CurrTL.getAs<MacroQualifiedTypeLoc>()) {
5819 TL.setExpansionLoc(
5820 State.getExpansionLocForMacroQualifiedType(TL.getTypePtr()));
5821 CurrTL = TL.getNextTypeLoc().getUnqualifiedLoc();
5822 }
5823
5824 while (AttributedTypeLoc TL = CurrTL.getAs<AttributedTypeLoc>()) {
5825 fillAttributedTypeLoc(TL, State);
5826 CurrTL = TL.getNextTypeLoc().getUnqualifiedLoc();
5827 }
5828
5829 while (DependentAddressSpaceTypeLoc TL =
5830 CurrTL.getAs<DependentAddressSpaceTypeLoc>()) {
5831 fillDependentAddressSpaceTypeLoc(TL, D.getTypeObject(i).getAttrs());
5832 CurrTL = TL.getPointeeTypeLoc().getUnqualifiedLoc();
5833 }
5834
5835 // FIXME: Ordering here?
5836 while (AdjustedTypeLoc TL = CurrTL.getAs<AdjustedTypeLoc>())
5837 CurrTL = TL.getNextTypeLoc().getUnqualifiedLoc();
5838
5839 DeclaratorLocFiller(S.Context, State, D.getTypeObject(i)).Visit(CurrTL);
5840 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc();
5841 }
5842
5843 // If we have different source information for the return type, use
5844 // that. This really only applies to C++ conversion functions.
5845 if (ReturnTypeInfo) {
5846 TypeLoc TL = ReturnTypeInfo->getTypeLoc();
5847 assert(TL.getFullDataSize() == CurrTL.getFullDataSize())((TL.getFullDataSize() == CurrTL.getFullDataSize()) ? static_cast
<void> (0) : __assert_fail ("TL.getFullDataSize() == CurrTL.getFullDataSize()"
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 5847, __PRETTY_FUNCTION__))
;
5848 memcpy(CurrTL.getOpaqueData(), TL.getOpaqueData(), TL.getFullDataSize());
5849 } else {
5850 TypeSpecLocFiller(S.Context, State, D.getDeclSpec()).Visit(CurrTL);
5851 }
5852
5853 return TInfo;
5854}
5855
5856/// Create a LocInfoType to hold the given QualType and TypeSourceInfo.
5857ParsedType Sema::CreateParsedType(QualType T, TypeSourceInfo *TInfo) {
5858 // FIXME: LocInfoTypes are "transient", only needed for passing to/from Parser
5859 // and Sema during declaration parsing. Try deallocating/caching them when
5860 // it's appropriate, instead of allocating them and keeping them around.
5861 LocInfoType *LocT = (LocInfoType*)BumpAlloc.Allocate(sizeof(LocInfoType),
5862 TypeAlignment);
5863 new (LocT) LocInfoType(T, TInfo);
5864 assert(LocT->getTypeClass() != T->getTypeClass() &&((LocT->getTypeClass() != T->getTypeClass() && "LocInfoType's TypeClass conflicts with an existing Type class"
) ? static_cast<void> (0) : __assert_fail ("LocT->getTypeClass() != T->getTypeClass() && \"LocInfoType's TypeClass conflicts with an existing Type class\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 5865, __PRETTY_FUNCTION__))
5865 "LocInfoType's TypeClass conflicts with an existing Type class")((LocT->getTypeClass() != T->getTypeClass() && "LocInfoType's TypeClass conflicts with an existing Type class"
) ? static_cast<void> (0) : __assert_fail ("LocT->getTypeClass() != T->getTypeClass() && \"LocInfoType's TypeClass conflicts with an existing Type class\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 5865, __PRETTY_FUNCTION__))
;
5866 return ParsedType::make(QualType(LocT, 0));
5867}
5868
5869void LocInfoType::getAsStringInternal(std::string &Str,
5870 const PrintingPolicy &Policy) const {
5871 llvm_unreachable("LocInfoType leaked into the type system; an opaque TypeTy*"::llvm::llvm_unreachable_internal("LocInfoType leaked into the type system; an opaque TypeTy*"
" was used directly instead of getting the QualType through"
" GetTypeFromParser", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 5873)
5872 " was used directly instead of getting the QualType through"::llvm::llvm_unreachable_internal("LocInfoType leaked into the type system; an opaque TypeTy*"
" was used directly instead of getting the QualType through"
" GetTypeFromParser", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 5873)
5873 " GetTypeFromParser")::llvm::llvm_unreachable_internal("LocInfoType leaked into the type system; an opaque TypeTy*"
" was used directly instead of getting the QualType through"
" GetTypeFromParser", "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 5873)
;
5874}
5875
5876TypeResult Sema::ActOnTypeName(Scope *S, Declarator &D) {
5877 // C99 6.7.6: Type names have no identifier. This is already validated by
5878 // the parser.
5879 assert(D.getIdentifier() == nullptr &&((D.getIdentifier() == nullptr && "Type name should have no identifier!"
) ? static_cast<void> (0) : __assert_fail ("D.getIdentifier() == nullptr && \"Type name should have no identifier!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 5880, __PRETTY_FUNCTION__))
5880 "Type name should have no identifier!")((D.getIdentifier() == nullptr && "Type name should have no identifier!"
) ? static_cast<void> (0) : __assert_fail ("D.getIdentifier() == nullptr && \"Type name should have no identifier!\""
, "/build/llvm-toolchain-snapshot-10~++20200112100611+7fa5290d5bd/clang/lib/Sema/SemaType.cpp"
, 5880, __PRETTY_FUNCTION__))
;
5881
5882 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
5883 QualType T = TInfo->getType();
5884 if (D.isInvalidType())
5885 return true;
5886
5887 // Make sure there are no unused decl attributes on the declarator.
5888 // We don't want to do this for ObjC parameters because we're going
5889 // to apply them to the actual parameter declaration.
5890 // Likewise, we don't want to do this for alias declarations, because
5891 // we are actually going to build a declaration from this eventually.
5892 if (D.getContext() != DeclaratorContext::ObjCParameterContext &&
5893 D.getContext() != DeclaratorContext::AliasDeclContext &&
5894 D.getContext() != DeclaratorContext::AliasTemplateContext)
5895 checkUnusedDeclAttributes(D);
5896
5897 if (getLangOpts().CPlusPlus) {
5898 // Check that there are no default arguments (C++ only).
5899 CheckExtraCXXDefaultArguments(D);
5900 }
5901
5902 return CreateParsedType(T, TInfo);
5903}
5904
5905ParsedType Sema::ActOnObjCInstanceType(SourceLocation Loc) {
5906 QualType T = Context.getObjCInstanceType();
5907 TypeSourceInfo *TInfo = Context.getTrivialTypeSourceInfo(T, Loc);
5908 return CreateParsedType(T, TInfo);
5909}
5910
5911//===----------------------------------------------------------------------===//
5912// Type Attribute Processing
5913//===----------------------------------------------------------------------===//
5914
5915/// Build an AddressSpace index from a constant expression and diagnose any
5916/// errors related to invalid address_spaces. Returns true on successfully
5917/// building an AddressSpace index.
5918static bool BuildAddressSpaceIndex(Sema &S, LangAS &ASIdx,
5919 const Expr *AddrSpace,
5920 SourceLocation AttrLoc) {
5921 if (!AddrSpace->isValueDependent()) {
5922 llvm::APSInt addrSpace(32);
5923 if (!AddrSpace->isIntegerConstantExpr(addrSpace, S.Context)) {
5924 S.Diag(AttrLoc, diag::err_attribute_argument_type)
5925 << "'address_space'" << AANT_ArgumentIntegerConstant
5926 << AddrSpace->getSourceRange();
5927 return false;
5928 }
5929
5930 // Bounds checking.
5931 if (addrSpace.isSigned()) {
5932 if (addrSpace.isNegative()) {
5933 S.Diag(AttrLoc, diag::err_attribute_address_space_negative)
5934 << AddrSpace->getSourceRange();
5935 return false;
5936 }
5937 addrSpace.setIsSigned(false);
5938 }
5939
5940 llvm::APSInt max(addrSpace.getBitWidth());
5941 max =
5942 Qualifiers::MaxAddressSpace - (unsigned)LangAS::FirstTargetAddressSpace;
5943 if (addrSpace > max) {
5944 S.Diag(AttrLoc, diag::err_attribute_address_space_too_high)
5945 << (unsigned)max.getZExtValue() << AddrSpace->getSourceRange();
5946 return false;
5947 }
5948
5949 ASIdx =
5950 getLangASFromTargetAS(static_cast<unsigned>(addrSpace.getZExtValue()));
5951 return true;
5952 }
5953
5954 // Default value for DependentAddressSpaceTypes
5955 ASIdx = LangAS::Default;
5956 return true;
5957}
5958
5959/// BuildAddressSpaceAttr - Builds a DependentAddressSpaceType if an expression
5960/// is uninstantiated. If instantiated it will apply the appropriate address
5961/// space to the type. This function allows dependent template variables to be
5962/// used in conjunction with the address_space attribute
5963QualType Sema::BuildAddressSpaceAttr(QualType &T, LangAS ASIdx, Expr *AddrSpace,
5964 SourceLocation AttrLoc) {
5965 if (!AddrSpace->isValueDependent()) {
5966 if (DiagnoseMultipleAddrSpaceAttributes(*this, T.getAddressSpace(), ASIdx,
5967 AttrLoc))
5968 return QualType();
5969
5970 return Context.getAddrSpaceQualType(T, ASIdx);
5971 }
5972
5973 // A check with similar intentions as checking if a type already has an
5974 // address space except for on a dependent types, basically if the
5975 // current type is already a DependentAddressSpaceType then its already
5976 // lined up to have another address space on it and we can't have
5977 // multiple address spaces on the one pointer indirection
5978 if (T->getAs<DependentAddressSpaceType>()) {
5979 Diag(AttrLoc, diag::err_attribute_address_multiple_qualifiers);
5980 return QualType();
5981 }
5982
5983 return Context.getDependentAddressSpaceType(T, AddrSpace, AttrLoc);
5984}
5985
5986QualType Sema::BuildAddressSpaceAttr(QualType &T, Expr *AddrSpace,
5987 SourceLocation AttrLoc) {
5988 LangAS ASIdx;
5989 if (!BuildAddressSpaceIndex(*this, ASIdx, AddrSpace, AttrLoc))
5990 return QualType();
5991 return BuildAddressSpaceAttr(T, ASIdx, AddrSpace, AttrLoc);
5992}
5993
5994/// HandleAddressSpaceTypeAttribute - Process an address_space attribute on the
5995/// specified type. The attribute contains 1 argument, the id of the address
5996/// space for the type.
5997static void HandleAddressSpaceTypeAttribute(QualType &Type,
5998 const ParsedAttr &Attr,
5999 TypeProcessingState &State) {
6000 Sema &S = State.getSema();
6001
6002 // ISO/IEC TR 18037 S5.3 (amending C99 6.7.3): "A function type shall not be
6003 // qualified by an address-space qualifier."
6004 if (Type->isFunctionType()) {
6005 S.Dia