Bug Summary

File:tools/clang/lib/AST/NestedNameSpecifier.cpp
Warning:line 493, column 3
Null pointer passed as an argument to a 'nonnull' parameter

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 NestedNameSpecifier.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 -analyzer-config-compatibility-mode=true -mrelocation-model pic -pic-level 2 -mthread-model posix -relaxed-aliasing -fmath-errno -masm-verbose -mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu x86-64 -dwarf-column-info -debugger-tuning=gdb -momit-leaf-frame-pointer -ffunction-sections -fdata-sections -resource-dir /usr/lib/llvm-9/lib/clang/9.0.0 -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-9~svn361465/build-llvm/tools/clang/lib/AST -I /build/llvm-toolchain-snapshot-9~svn361465/tools/clang/lib/AST -I /build/llvm-toolchain-snapshot-9~svn361465/tools/clang/include -I /build/llvm-toolchain-snapshot-9~svn361465/build-llvm/tools/clang/include -I /build/llvm-toolchain-snapshot-9~svn361465/build-llvm/include -I /build/llvm-toolchain-snapshot-9~svn361465/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/include/clang/9.0.0/include/ -internal-isystem /usr/local/include -internal-isystem /usr/lib/llvm-9/lib/clang/9.0.0/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++11 -fdeprecated-macro -fdebug-compilation-dir /build/llvm-toolchain-snapshot-9~svn361465/build-llvm/tools/clang/lib/AST -fdebug-prefix-map=/build/llvm-toolchain-snapshot-9~svn361465=. -ferror-limit 19 -fmessage-length 0 -fvisibility-inlines-hidden -stack-protector 2 -fobjc-runtime=gcc -fno-common -fdiagnostics-show-option -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -o /tmp/scan-build-2019-05-24-031927-21217-1 -x c++ /build/llvm-toolchain-snapshot-9~svn361465/tools/clang/lib/AST/NestedNameSpecifier.cpp -faddrsig

/build/llvm-toolchain-snapshot-9~svn361465/tools/clang/include/clang/AST/NestedNameSpecifier.h

1//===- NestedNameSpecifier.h - C++ nested name specifiers -------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file defines the NestedNameSpecifier class, which represents
10// a C++ nested-name-specifier.
11//
12//===----------------------------------------------------------------------===//
13
14#ifndef LLVM_CLANG_AST_NESTEDNAMESPECIFIER_H
15#define LLVM_CLANG_AST_NESTEDNAMESPECIFIER_H
16
17#include "clang/Basic/Diagnostic.h"
18#include "clang/Basic/SourceLocation.h"
19#include "llvm/ADT/FoldingSet.h"
20#include "llvm/ADT/PointerIntPair.h"
21#include "llvm/Support/Compiler.h"
22#include <cstdint>
23#include <cstdlib>
24#include <utility>
25
26namespace clang {
27
28class ASTContext;
29class CXXRecordDecl;
30class IdentifierInfo;
31class LangOptions;
32class NamespaceAliasDecl;
33class NamespaceDecl;
34struct PrintingPolicy;
35class Type;
36class TypeLoc;
37
38/// Represents a C++ nested name specifier, such as
39/// "\::std::vector<int>::".
40///
41/// C++ nested name specifiers are the prefixes to qualified
42/// names. For example, "foo::" in "foo::x" is a nested name
43/// specifier. Nested name specifiers are made up of a sequence of
44/// specifiers, each of which can be a namespace, type, identifier
45/// (for dependent names), decltype specifier, or the global specifier ('::').
46/// The last two specifiers can only appear at the start of a
47/// nested-namespace-specifier.
48class NestedNameSpecifier : public llvm::FoldingSetNode {
49 /// Enumeration describing
50 enum StoredSpecifierKind {
51 StoredIdentifier = 0,
52 StoredDecl = 1,
53 StoredTypeSpec = 2,
54 StoredTypeSpecWithTemplate = 3
55 };
56
57 /// The nested name specifier that precedes this nested name
58 /// specifier.
59 ///
60 /// The pointer is the nested-name-specifier that precedes this
61 /// one. The integer stores one of the first four values of type
62 /// SpecifierKind.
63 llvm::PointerIntPair<NestedNameSpecifier *, 2, StoredSpecifierKind> Prefix;
64
65 /// The last component in the nested name specifier, which
66 /// can be an identifier, a declaration, or a type.
67 ///
68 /// When the pointer is NULL, this specifier represents the global
69 /// specifier '::'. Otherwise, the pointer is one of
70 /// IdentifierInfo*, Namespace*, or Type*, depending on the kind of
71 /// specifier as encoded within the prefix.
72 void* Specifier = nullptr;
73
74public:
75 /// The kind of specifier that completes this nested name
76 /// specifier.
77 enum SpecifierKind {
78 /// An identifier, stored as an IdentifierInfo*.
79 Identifier,
80
81 /// A namespace, stored as a NamespaceDecl*.
82 Namespace,
83
84 /// A namespace alias, stored as a NamespaceAliasDecl*.
85 NamespaceAlias,
86
87 /// A type, stored as a Type*.
88 TypeSpec,
89
90 /// A type that was preceded by the 'template' keyword,
91 /// stored as a Type*.
92 TypeSpecWithTemplate,
93
94 /// The global specifier '::'. There is no stored value.
95 Global,
96
97 /// Microsoft's '__super' specifier, stored as a CXXRecordDecl* of
98 /// the class it appeared in.
99 Super
100 };
101
102private:
103 /// Builds the global specifier.
104 NestedNameSpecifier() : Prefix(nullptr, StoredIdentifier) {}
105
106 /// Copy constructor used internally to clone nested name
107 /// specifiers.
108 NestedNameSpecifier(const NestedNameSpecifier &Other) = default;
109
110 /// Either find or insert the given nested name specifier
111 /// mockup in the given context.
112 static NestedNameSpecifier *FindOrInsert(const ASTContext &Context,
113 const NestedNameSpecifier &Mockup);
114
115public:
116 NestedNameSpecifier &operator=(const NestedNameSpecifier &) = delete;
117
118 /// Builds a specifier combining a prefix and an identifier.
119 ///
120 /// The prefix must be dependent, since nested name specifiers
121 /// referencing an identifier are only permitted when the identifier
122 /// cannot be resolved.
123 static NestedNameSpecifier *Create(const ASTContext &Context,
124 NestedNameSpecifier *Prefix,
125 IdentifierInfo *II);
126
127 /// Builds a nested name specifier that names a namespace.
128 static NestedNameSpecifier *Create(const ASTContext &Context,
129 NestedNameSpecifier *Prefix,
130 const NamespaceDecl *NS);
131
132 /// Builds a nested name specifier that names a namespace alias.
133 static NestedNameSpecifier *Create(const ASTContext &Context,
134 NestedNameSpecifier *Prefix,
135 NamespaceAliasDecl *Alias);
136
137 /// Builds a nested name specifier that names a type.
138 static NestedNameSpecifier *Create(const ASTContext &Context,
139 NestedNameSpecifier *Prefix,
140 bool Template, const Type *T);
141
142 /// Builds a specifier that consists of just an identifier.
143 ///
144 /// The nested-name-specifier is assumed to be dependent, but has no
145 /// prefix because the prefix is implied by something outside of the
146 /// nested name specifier, e.g., in "x->Base::f", the "x" has a dependent
147 /// type.
148 static NestedNameSpecifier *Create(const ASTContext &Context,
149 IdentifierInfo *II);
150
151 /// Returns the nested name specifier representing the global
152 /// scope.
153 static NestedNameSpecifier *GlobalSpecifier(const ASTContext &Context);
154
155 /// Returns the nested name specifier representing the __super scope
156 /// for the given CXXRecordDecl.
157 static NestedNameSpecifier *SuperSpecifier(const ASTContext &Context,
158 CXXRecordDecl *RD);
159
160 /// Return the prefix of this nested name specifier.
161 ///
162 /// The prefix contains all of the parts of the nested name
163 /// specifier that preced this current specifier. For example, for a
164 /// nested name specifier that represents "foo::bar::", the current
165 /// specifier will contain "bar::" and the prefix will contain
166 /// "foo::".
167 NestedNameSpecifier *getPrefix() const { return Prefix.getPointer(); }
168
169 /// Determine what kind of nested name specifier is stored.
170 SpecifierKind getKind() const;
171
172 /// Retrieve the identifier stored in this nested name
173 /// specifier.
174 IdentifierInfo *getAsIdentifier() const {
175 if (Prefix.getInt() == StoredIdentifier)
176 return (IdentifierInfo *)Specifier;
177
178 return nullptr;
179 }
180
181 /// Retrieve the namespace stored in this nested name
182 /// specifier.
183 NamespaceDecl *getAsNamespace() const;
184
185 /// Retrieve the namespace alias stored in this nested name
186 /// specifier.
187 NamespaceAliasDecl *getAsNamespaceAlias() const;
188
189 /// Retrieve the record declaration stored in this nested name
190 /// specifier.
191 CXXRecordDecl *getAsRecordDecl() const;
192
193 /// Retrieve the type stored in this nested name specifier.
194 const Type *getAsType() const {
195 if (Prefix.getInt() == StoredTypeSpec ||
196 Prefix.getInt() == StoredTypeSpecWithTemplate)
197 return (const Type *)Specifier;
198
199 return nullptr;
200 }
201
202 /// Whether this nested name specifier refers to a dependent
203 /// type or not.
204 bool isDependent() const;
205
206 /// Whether this nested name specifier involves a template
207 /// parameter.
208 bool isInstantiationDependent() const;
209
210 /// Whether this nested-name-specifier contains an unexpanded
211 /// parameter pack (for C++11 variadic templates).
212 bool containsUnexpandedParameterPack() const;
213
214 /// Print this nested name specifier to the given output stream. If
215 /// `ResolveTemplateArguments` is true, we'll print actual types, e.g.
216 /// `ns::SomeTemplate<int, MyClass>` instead of
217 /// `ns::SomeTemplate<Container::value_type, T>`.
218 void print(raw_ostream &OS, const PrintingPolicy &Policy,
219 bool ResolveTemplateArguments = false) const;
220
221 void Profile(llvm::FoldingSetNodeID &ID) const {
222 ID.AddPointer(Prefix.getOpaqueValue());
223 ID.AddPointer(Specifier);
224 }
225
226 /// Dump the nested name specifier to standard output to aid
227 /// in debugging.
228 void dump(const LangOptions &LO) const;
229 void dump() const;
230 void dump(llvm::raw_ostream &OS) const;
231 void dump(llvm::raw_ostream &OS, const LangOptions &LO) const;
232};
233
234/// A C++ nested-name-specifier augmented with source location
235/// information.
236class NestedNameSpecifierLoc {
237 NestedNameSpecifier *Qualifier = nullptr;
238 void *Data = nullptr;
239
240 /// Determines the data length for the last component in the
241 /// given nested-name-specifier.
242 static unsigned getLocalDataLength(NestedNameSpecifier *Qualifier);
243
244 /// Determines the data length for the entire
245 /// nested-name-specifier.
246 static unsigned getDataLength(NestedNameSpecifier *Qualifier);
247
248public:
249 /// Construct an empty nested-name-specifier.
250 NestedNameSpecifierLoc() = default;
251
252 /// Construct a nested-name-specifier with source location information
253 /// from
254 NestedNameSpecifierLoc(NestedNameSpecifier *Qualifier, void *Data)
255 : Qualifier(Qualifier), Data(Data) {}
256
257 /// Evaluates true when this nested-name-specifier location is
258 /// non-empty.
259 explicit operator bool() const { return Qualifier; }
260
261 /// Evaluates true when this nested-name-specifier location is
262 /// empty.
263 bool hasQualifier() const { return Qualifier; }
264
265 /// Retrieve the nested-name-specifier to which this instance
266 /// refers.
267 NestedNameSpecifier *getNestedNameSpecifier() const {
268 return Qualifier;
269 }
270
271 /// Retrieve the opaque pointer that refers to source-location data.
272 void *getOpaqueData() const { return Data; }
273
274 /// Retrieve the source range covering the entirety of this
275 /// nested-name-specifier.
276 ///
277 /// For example, if this instance refers to a nested-name-specifier
278 /// \c \::std::vector<int>::, the returned source range would cover
279 /// from the initial '::' to the last '::'.
280 SourceRange getSourceRange() const LLVM_READONLY__attribute__((__pure__));
281
282 /// Retrieve the source range covering just the last part of
283 /// this nested-name-specifier, not including the prefix.
284 ///
285 /// For example, if this instance refers to a nested-name-specifier
286 /// \c \::std::vector<int>::, the returned source range would cover
287 /// from "vector" to the last '::'.
288 SourceRange getLocalSourceRange() const;
289
290 /// Retrieve the location of the beginning of this
291 /// nested-name-specifier.
292 SourceLocation getBeginLoc() const {
293 return getSourceRange().getBegin();
294 }
295
296 /// Retrieve the location of the end of this
297 /// nested-name-specifier.
298 SourceLocation getEndLoc() const {
299 return getSourceRange().getEnd();
300 }
301
302 /// Retrieve the location of the beginning of this
303 /// component of the nested-name-specifier.
304 SourceLocation getLocalBeginLoc() const {
305 return getLocalSourceRange().getBegin();
306 }
307
308 /// Retrieve the location of the end of this component of the
309 /// nested-name-specifier.
310 SourceLocation getLocalEndLoc() const {
311 return getLocalSourceRange().getEnd();
312 }
313
314 /// Return the prefix of this nested-name-specifier.
315 ///
316 /// For example, if this instance refers to a nested-name-specifier
317 /// \c \::std::vector<int>::, the prefix is \c \::std::. Note that the
318 /// returned prefix may be empty, if this is the first component of
319 /// the nested-name-specifier.
320 NestedNameSpecifierLoc getPrefix() const {
321 if (!Qualifier)
322 return *this;
323
324 return NestedNameSpecifierLoc(Qualifier->getPrefix(), Data);
325 }
326
327 /// For a nested-name-specifier that refers to a type,
328 /// retrieve the type with source-location information.
329 TypeLoc getTypeLoc() const;
330
331 /// Determines the data length for the entire
332 /// nested-name-specifier.
333 unsigned getDataLength() const { return getDataLength(Qualifier); }
334
335 friend bool operator==(NestedNameSpecifierLoc X,
336 NestedNameSpecifierLoc Y) {
337 return X.Qualifier == Y.Qualifier && X.Data == Y.Data;
338 }
339
340 friend bool operator!=(NestedNameSpecifierLoc X,
341 NestedNameSpecifierLoc Y) {
342 return !(X == Y);
343 }
344};
345
346/// Class that aids in the construction of nested-name-specifiers along
347/// with source-location information for all of the components of the
348/// nested-name-specifier.
349class NestedNameSpecifierLocBuilder {
350 /// The current representation of the nested-name-specifier we're
351 /// building.
352 NestedNameSpecifier *Representation = nullptr;
353
354 /// Buffer used to store source-location information for the
355 /// nested-name-specifier.
356 ///
357 /// Note that we explicitly manage the buffer (rather than using a
358 /// SmallVector) because \c Declarator expects it to be possible to memcpy()
359 /// a \c CXXScopeSpec, and CXXScopeSpec uses a NestedNameSpecifierLocBuilder.
360 char *Buffer = nullptr;
1
Null pointer value stored to field 'Buffer'
361
362 /// The size of the buffer used to store source-location information
363 /// for the nested-name-specifier.
364 unsigned BufferSize = 0;
365
366 /// The capacity of the buffer used to store source-location
367 /// information for the nested-name-specifier.
368 unsigned BufferCapacity = 0;
369
370public:
371 NestedNameSpecifierLocBuilder() = default;
372 NestedNameSpecifierLocBuilder(const NestedNameSpecifierLocBuilder &Other);
373
374 NestedNameSpecifierLocBuilder &
375 operator=(const NestedNameSpecifierLocBuilder &Other);
376
377 ~NestedNameSpecifierLocBuilder() {
378 if (BufferCapacity)
379 free(Buffer);
380 }
381
382 /// Retrieve the representation of the nested-name-specifier.
383 NestedNameSpecifier *getRepresentation() const { return Representation; }
384
385 /// Extend the current nested-name-specifier by another
386 /// nested-name-specifier component of the form 'type::'.
387 ///
388 /// \param Context The AST context in which this nested-name-specifier
389 /// resides.
390 ///
391 /// \param TemplateKWLoc The location of the 'template' keyword, if present.
392 ///
393 /// \param TL The TypeLoc that describes the type preceding the '::'.
394 ///
395 /// \param ColonColonLoc The location of the trailing '::'.
396 void Extend(ASTContext &Context, SourceLocation TemplateKWLoc, TypeLoc TL,
397 SourceLocation ColonColonLoc);
398
399 /// Extend the current nested-name-specifier by another
400 /// nested-name-specifier component of the form 'identifier::'.
401 ///
402 /// \param Context The AST context in which this nested-name-specifier
403 /// resides.
404 ///
405 /// \param Identifier The identifier.
406 ///
407 /// \param IdentifierLoc The location of the identifier.
408 ///
409 /// \param ColonColonLoc The location of the trailing '::'.
410 void Extend(ASTContext &Context, IdentifierInfo *Identifier,
411 SourceLocation IdentifierLoc, SourceLocation ColonColonLoc);
412
413 /// Extend the current nested-name-specifier by another
414 /// nested-name-specifier component of the form 'namespace::'.
415 ///
416 /// \param Context The AST context in which this nested-name-specifier
417 /// resides.
418 ///
419 /// \param Namespace The namespace.
420 ///
421 /// \param NamespaceLoc The location of the namespace name.
422 ///
423 /// \param ColonColonLoc The location of the trailing '::'.
424 void Extend(ASTContext &Context, NamespaceDecl *Namespace,
425 SourceLocation NamespaceLoc, SourceLocation ColonColonLoc);
426
427 /// Extend the current nested-name-specifier by another
428 /// nested-name-specifier component of the form 'namespace-alias::'.
429 ///
430 /// \param Context The AST context in which this nested-name-specifier
431 /// resides.
432 ///
433 /// \param Alias The namespace alias.
434 ///
435 /// \param AliasLoc The location of the namespace alias
436 /// name.
437 ///
438 /// \param ColonColonLoc The location of the trailing '::'.
439 void Extend(ASTContext &Context, NamespaceAliasDecl *Alias,
440 SourceLocation AliasLoc, SourceLocation ColonColonLoc);
441
442 /// Turn this (empty) nested-name-specifier into the global
443 /// nested-name-specifier '::'.
444 void MakeGlobal(ASTContext &Context, SourceLocation ColonColonLoc);
445
446 /// Turns this (empty) nested-name-specifier into '__super'
447 /// nested-name-specifier.
448 ///
449 /// \param Context The AST context in which this nested-name-specifier
450 /// resides.
451 ///
452 /// \param RD The declaration of the class in which nested-name-specifier
453 /// appeared.
454 ///
455 /// \param SuperLoc The location of the '__super' keyword.
456 /// name.
457 ///
458 /// \param ColonColonLoc The location of the trailing '::'.
459 void MakeSuper(ASTContext &Context, CXXRecordDecl *RD,
460 SourceLocation SuperLoc, SourceLocation ColonColonLoc);
461
462 /// Make a new nested-name-specifier from incomplete source-location
463 /// information.
464 ///
465 /// This routine should be used very, very rarely, in cases where we
466 /// need to synthesize a nested-name-specifier. Most code should instead use
467 /// \c Adopt() with a proper \c NestedNameSpecifierLoc.
468 void MakeTrivial(ASTContext &Context, NestedNameSpecifier *Qualifier,
469 SourceRange R);
470
471 /// Adopt an existing nested-name-specifier (with source-range
472 /// information).
473 void Adopt(NestedNameSpecifierLoc Other);
474
475 /// Retrieve the source range covered by this nested-name-specifier.
476 SourceRange getSourceRange() const LLVM_READONLY__attribute__((__pure__)) {
477 return NestedNameSpecifierLoc(Representation, Buffer).getSourceRange();
478 }
479
480 /// Retrieve a nested-name-specifier with location information,
481 /// copied into the given AST context.
482 ///
483 /// \param Context The context into which this nested-name-specifier will be
484 /// copied.
485 NestedNameSpecifierLoc getWithLocInContext(ASTContext &Context) const;
486
487 /// Retrieve a nested-name-specifier with location
488 /// information based on the information in this builder.
489 ///
490 /// This loc will contain references to the builder's internal data and may
491 /// be invalidated by any change to the builder.
492 NestedNameSpecifierLoc getTemporary() const {
493 return NestedNameSpecifierLoc(Representation, Buffer);
494 }
495
496 /// Clear out this builder, and prepare it to build another
497 /// nested-name-specifier with source-location information.
498 void Clear() {
499 Representation = nullptr;
500 BufferSize = 0;
501 }
502
503 /// Retrieve the underlying buffer.
504 ///
505 /// \returns A pair containing a pointer to the buffer of source-location
506 /// data and the size of the source-location data that resides in that
507 /// buffer.
508 std::pair<char *, unsigned> getBuffer() const {
509 return std::make_pair(Buffer, BufferSize);
510 }
511};
512
513/// Insertion operator for diagnostics. This allows sending
514/// NestedNameSpecifiers into a diagnostic with <<.
515inline const DiagnosticBuilder &operator<<(const DiagnosticBuilder &DB,
516 NestedNameSpecifier *NNS) {
517 DB.AddTaggedVal(reinterpret_cast<intptr_t>(NNS),
518 DiagnosticsEngine::ak_nestednamespec);
519 return DB;
520}
521
522} // namespace clang
523
524#endif // LLVM_CLANG_AST_NESTEDNAMESPECIFIER_H

/build/llvm-toolchain-snapshot-9~svn361465/tools/clang/lib/AST/NestedNameSpecifier.cpp

1//===- NestedNameSpecifier.cpp - C++ nested name specifiers ---------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file defines the NestedNameSpecifier class, which represents
10// a C++ nested-name-specifier.
11//
12//===----------------------------------------------------------------------===//
13
14#include "clang/AST/NestedNameSpecifier.h"
15#include "clang/AST/ASTContext.h"
16#include "clang/AST/Decl.h"
17#include "clang/AST/DeclCXX.h"
18#include "clang/AST/DeclTemplate.h"
19#include "clang/AST/PrettyPrinter.h"
20#include "clang/AST/TemplateName.h"
21#include "clang/AST/Type.h"
22#include "clang/AST/TypeLoc.h"
23#include "clang/Basic/LLVM.h"
24#include "clang/Basic/LangOptions.h"
25#include "clang/Basic/SourceLocation.h"
26#include "llvm/ADT/FoldingSet.h"
27#include "llvm/ADT/SmallVector.h"
28#include "llvm/Support/Casting.h"
29#include "llvm/Support/Compiler.h"
30#include "llvm/Support/ErrorHandling.h"
31#include "llvm/Support/raw_ostream.h"
32#include <algorithm>
33#include <cassert>
34#include <cstdlib>
35#include <cstring>
36
37using namespace clang;
38
39NestedNameSpecifier *
40NestedNameSpecifier::FindOrInsert(const ASTContext &Context,
41 const NestedNameSpecifier &Mockup) {
42 llvm::FoldingSetNodeID ID;
43 Mockup.Profile(ID);
44
45 void *InsertPos = nullptr;
46 NestedNameSpecifier *NNS
47 = Context.NestedNameSpecifiers.FindNodeOrInsertPos(ID, InsertPos);
48 if (!NNS) {
49 NNS =
50 new (Context, alignof(NestedNameSpecifier)) NestedNameSpecifier(Mockup);
51 Context.NestedNameSpecifiers.InsertNode(NNS, InsertPos);
52 }
53
54 return NNS;
55}
56
57NestedNameSpecifier *
58NestedNameSpecifier::Create(const ASTContext &Context,
59 NestedNameSpecifier *Prefix, IdentifierInfo *II) {
60 assert(II && "Identifier cannot be NULL")((II && "Identifier cannot be NULL") ? static_cast<
void> (0) : __assert_fail ("II && \"Identifier cannot be NULL\""
, "/build/llvm-toolchain-snapshot-9~svn361465/tools/clang/lib/AST/NestedNameSpecifier.cpp"
, 60, __PRETTY_FUNCTION__))
;
61 assert((!Prefix || Prefix->isDependent()) && "Prefix must be dependent")(((!Prefix || Prefix->isDependent()) && "Prefix must be dependent"
) ? static_cast<void> (0) : __assert_fail ("(!Prefix || Prefix->isDependent()) && \"Prefix must be dependent\""
, "/build/llvm-toolchain-snapshot-9~svn361465/tools/clang/lib/AST/NestedNameSpecifier.cpp"
, 61, __PRETTY_FUNCTION__))
;
62
63 NestedNameSpecifier Mockup;
64 Mockup.Prefix.setPointer(Prefix);
65 Mockup.Prefix.setInt(StoredIdentifier);
66 Mockup.Specifier = II;
67 return FindOrInsert(Context, Mockup);
68}
69
70NestedNameSpecifier *
71NestedNameSpecifier::Create(const ASTContext &Context,
72 NestedNameSpecifier *Prefix,
73 const NamespaceDecl *NS) {
74 assert(NS && "Namespace cannot be NULL")((NS && "Namespace cannot be NULL") ? static_cast<
void> (0) : __assert_fail ("NS && \"Namespace cannot be NULL\""
, "/build/llvm-toolchain-snapshot-9~svn361465/tools/clang/lib/AST/NestedNameSpecifier.cpp"
, 74, __PRETTY_FUNCTION__))
;
75 assert((!Prefix ||(((!Prefix || (Prefix->getAsType() == nullptr && Prefix
->getAsIdentifier() == nullptr)) && "Broken nested name specifier"
) ? static_cast<void> (0) : __assert_fail ("(!Prefix || (Prefix->getAsType() == nullptr && Prefix->getAsIdentifier() == nullptr)) && \"Broken nested name specifier\""
, "/build/llvm-toolchain-snapshot-9~svn361465/tools/clang/lib/AST/NestedNameSpecifier.cpp"
, 78, __PRETTY_FUNCTION__))
76 (Prefix->getAsType() == nullptr &&(((!Prefix || (Prefix->getAsType() == nullptr && Prefix
->getAsIdentifier() == nullptr)) && "Broken nested name specifier"
) ? static_cast<void> (0) : __assert_fail ("(!Prefix || (Prefix->getAsType() == nullptr && Prefix->getAsIdentifier() == nullptr)) && \"Broken nested name specifier\""
, "/build/llvm-toolchain-snapshot-9~svn361465/tools/clang/lib/AST/NestedNameSpecifier.cpp"
, 78, __PRETTY_FUNCTION__))
77 Prefix->getAsIdentifier() == nullptr)) &&(((!Prefix || (Prefix->getAsType() == nullptr && Prefix
->getAsIdentifier() == nullptr)) && "Broken nested name specifier"
) ? static_cast<void> (0) : __assert_fail ("(!Prefix || (Prefix->getAsType() == nullptr && Prefix->getAsIdentifier() == nullptr)) && \"Broken nested name specifier\""
, "/build/llvm-toolchain-snapshot-9~svn361465/tools/clang/lib/AST/NestedNameSpecifier.cpp"
, 78, __PRETTY_FUNCTION__))
78 "Broken nested name specifier")(((!Prefix || (Prefix->getAsType() == nullptr && Prefix
->getAsIdentifier() == nullptr)) && "Broken nested name specifier"
) ? static_cast<void> (0) : __assert_fail ("(!Prefix || (Prefix->getAsType() == nullptr && Prefix->getAsIdentifier() == nullptr)) && \"Broken nested name specifier\""
, "/build/llvm-toolchain-snapshot-9~svn361465/tools/clang/lib/AST/NestedNameSpecifier.cpp"
, 78, __PRETTY_FUNCTION__))
;
79 NestedNameSpecifier Mockup;
80 Mockup.Prefix.setPointer(Prefix);
81 Mockup.Prefix.setInt(StoredDecl);
82 Mockup.Specifier = const_cast<NamespaceDecl *>(NS);
83 return FindOrInsert(Context, Mockup);
84}
85
86NestedNameSpecifier *
87NestedNameSpecifier::Create(const ASTContext &Context,
88 NestedNameSpecifier *Prefix,
89 NamespaceAliasDecl *Alias) {
90 assert(Alias && "Namespace alias cannot be NULL")((Alias && "Namespace alias cannot be NULL") ? static_cast
<void> (0) : __assert_fail ("Alias && \"Namespace alias cannot be NULL\""
, "/build/llvm-toolchain-snapshot-9~svn361465/tools/clang/lib/AST/NestedNameSpecifier.cpp"
, 90, __PRETTY_FUNCTION__))
;
91 assert((!Prefix ||(((!Prefix || (Prefix->getAsType() == nullptr && Prefix
->getAsIdentifier() == nullptr)) && "Broken nested name specifier"
) ? static_cast<void> (0) : __assert_fail ("(!Prefix || (Prefix->getAsType() == nullptr && Prefix->getAsIdentifier() == nullptr)) && \"Broken nested name specifier\""
, "/build/llvm-toolchain-snapshot-9~svn361465/tools/clang/lib/AST/NestedNameSpecifier.cpp"
, 94, __PRETTY_FUNCTION__))
92 (Prefix->getAsType() == nullptr &&(((!Prefix || (Prefix->getAsType() == nullptr && Prefix
->getAsIdentifier() == nullptr)) && "Broken nested name specifier"
) ? static_cast<void> (0) : __assert_fail ("(!Prefix || (Prefix->getAsType() == nullptr && Prefix->getAsIdentifier() == nullptr)) && \"Broken nested name specifier\""
, "/build/llvm-toolchain-snapshot-9~svn361465/tools/clang/lib/AST/NestedNameSpecifier.cpp"
, 94, __PRETTY_FUNCTION__))
93 Prefix->getAsIdentifier() == nullptr)) &&(((!Prefix || (Prefix->getAsType() == nullptr && Prefix
->getAsIdentifier() == nullptr)) && "Broken nested name specifier"
) ? static_cast<void> (0) : __assert_fail ("(!Prefix || (Prefix->getAsType() == nullptr && Prefix->getAsIdentifier() == nullptr)) && \"Broken nested name specifier\""
, "/build/llvm-toolchain-snapshot-9~svn361465/tools/clang/lib/AST/NestedNameSpecifier.cpp"
, 94, __PRETTY_FUNCTION__))
94 "Broken nested name specifier")(((!Prefix || (Prefix->getAsType() == nullptr && Prefix
->getAsIdentifier() == nullptr)) && "Broken nested name specifier"
) ? static_cast<void> (0) : __assert_fail ("(!Prefix || (Prefix->getAsType() == nullptr && Prefix->getAsIdentifier() == nullptr)) && \"Broken nested name specifier\""
, "/build/llvm-toolchain-snapshot-9~svn361465/tools/clang/lib/AST/NestedNameSpecifier.cpp"
, 94, __PRETTY_FUNCTION__))
;
95 NestedNameSpecifier Mockup;
96 Mockup.Prefix.setPointer(Prefix);
97 Mockup.Prefix.setInt(StoredDecl);
98 Mockup.Specifier = Alias;
99 return FindOrInsert(Context, Mockup);
100}
101
102NestedNameSpecifier *
103NestedNameSpecifier::Create(const ASTContext &Context,
104 NestedNameSpecifier *Prefix,
105 bool Template, const Type *T) {
106 assert(T && "Type cannot be NULL")((T && "Type cannot be NULL") ? static_cast<void>
(0) : __assert_fail ("T && \"Type cannot be NULL\"",
"/build/llvm-toolchain-snapshot-9~svn361465/tools/clang/lib/AST/NestedNameSpecifier.cpp"
, 106, __PRETTY_FUNCTION__))
;
107 NestedNameSpecifier Mockup;
108 Mockup.Prefix.setPointer(Prefix);
109 Mockup.Prefix.setInt(Template? StoredTypeSpecWithTemplate : StoredTypeSpec);
110 Mockup.Specifier = const_cast<Type*>(T);
111 return FindOrInsert(Context, Mockup);
112}
113
114NestedNameSpecifier *
115NestedNameSpecifier::Create(const ASTContext &Context, IdentifierInfo *II) {
116 assert(II && "Identifier cannot be NULL")((II && "Identifier cannot be NULL") ? static_cast<
void> (0) : __assert_fail ("II && \"Identifier cannot be NULL\""
, "/build/llvm-toolchain-snapshot-9~svn361465/tools/clang/lib/AST/NestedNameSpecifier.cpp"
, 116, __PRETTY_FUNCTION__))
;
117 NestedNameSpecifier Mockup;
118 Mockup.Prefix.setPointer(nullptr);
119 Mockup.Prefix.setInt(StoredIdentifier);
120 Mockup.Specifier = II;
121 return FindOrInsert(Context, Mockup);
122}
123
124NestedNameSpecifier *
125NestedNameSpecifier::GlobalSpecifier(const ASTContext &Context) {
126 if (!Context.GlobalNestedNameSpecifier)
127 Context.GlobalNestedNameSpecifier =
128 new (Context, alignof(NestedNameSpecifier)) NestedNameSpecifier();
129 return Context.GlobalNestedNameSpecifier;
130}
131
132NestedNameSpecifier *
133NestedNameSpecifier::SuperSpecifier(const ASTContext &Context,
134 CXXRecordDecl *RD) {
135 NestedNameSpecifier Mockup;
136 Mockup.Prefix.setPointer(nullptr);
137 Mockup.Prefix.setInt(StoredDecl);
138 Mockup.Specifier = RD;
139 return FindOrInsert(Context, Mockup);
140}
141
142NestedNameSpecifier::SpecifierKind NestedNameSpecifier::getKind() const {
143 if (!Specifier)
144 return Global;
145
146 switch (Prefix.getInt()) {
147 case StoredIdentifier:
148 return Identifier;
149
150 case StoredDecl: {
151 NamedDecl *ND = static_cast<NamedDecl *>(Specifier);
152 if (isa<CXXRecordDecl>(ND))
153 return Super;
154 return isa<NamespaceDecl>(ND) ? Namespace : NamespaceAlias;
155 }
156
157 case StoredTypeSpec:
158 return TypeSpec;
159
160 case StoredTypeSpecWithTemplate:
161 return TypeSpecWithTemplate;
162 }
163
164 llvm_unreachable("Invalid NNS Kind!")::llvm::llvm_unreachable_internal("Invalid NNS Kind!", "/build/llvm-toolchain-snapshot-9~svn361465/tools/clang/lib/AST/NestedNameSpecifier.cpp"
, 164)
;
165}
166
167/// Retrieve the namespace stored in this nested name specifier.
168NamespaceDecl *NestedNameSpecifier::getAsNamespace() const {
169 if (Prefix.getInt() == StoredDecl)
170 return dyn_cast<NamespaceDecl>(static_cast<NamedDecl *>(Specifier));
171
172 return nullptr;
173}
174
175/// Retrieve the namespace alias stored in this nested name specifier.
176NamespaceAliasDecl *NestedNameSpecifier::getAsNamespaceAlias() const {
177 if (Prefix.getInt() == StoredDecl)
178 return dyn_cast<NamespaceAliasDecl>(static_cast<NamedDecl *>(Specifier));
179
180 return nullptr;
181}
182
183/// Retrieve the record declaration stored in this nested name specifier.
184CXXRecordDecl *NestedNameSpecifier::getAsRecordDecl() const {
185 switch (Prefix.getInt()) {
186 case StoredIdentifier:
187 return nullptr;
188
189 case StoredDecl:
190 return dyn_cast<CXXRecordDecl>(static_cast<NamedDecl *>(Specifier));
191
192 case StoredTypeSpec:
193 case StoredTypeSpecWithTemplate:
194 return getAsType()->getAsCXXRecordDecl();
195 }
196
197 llvm_unreachable("Invalid NNS Kind!")::llvm::llvm_unreachable_internal("Invalid NNS Kind!", "/build/llvm-toolchain-snapshot-9~svn361465/tools/clang/lib/AST/NestedNameSpecifier.cpp"
, 197)
;
198}
199
200/// Whether this nested name specifier refers to a dependent
201/// type or not.
202bool NestedNameSpecifier::isDependent() const {
203 switch (getKind()) {
204 case Identifier:
205 // Identifier specifiers always represent dependent types
206 return true;
207
208 case Namespace:
209 case NamespaceAlias:
210 case Global:
211 return false;
212
213 case Super: {
214 CXXRecordDecl *RD = static_cast<CXXRecordDecl *>(Specifier);
215 for (const auto &Base : RD->bases())
216 if (Base.getType()->isDependentType())
217 return true;
218
219 return false;
220 }
221
222 case TypeSpec:
223 case TypeSpecWithTemplate:
224 return getAsType()->isDependentType();
225 }
226
227 llvm_unreachable("Invalid NNS Kind!")::llvm::llvm_unreachable_internal("Invalid NNS Kind!", "/build/llvm-toolchain-snapshot-9~svn361465/tools/clang/lib/AST/NestedNameSpecifier.cpp"
, 227)
;
228}
229
230/// Whether this nested name specifier refers to a dependent
231/// type or not.
232bool NestedNameSpecifier::isInstantiationDependent() const {
233 switch (getKind()) {
234 case Identifier:
235 // Identifier specifiers always represent dependent types
236 return true;
237
238 case Namespace:
239 case NamespaceAlias:
240 case Global:
241 case Super:
242 return false;
243
244 case TypeSpec:
245 case TypeSpecWithTemplate:
246 return getAsType()->isInstantiationDependentType();
247 }
248
249 llvm_unreachable("Invalid NNS Kind!")::llvm::llvm_unreachable_internal("Invalid NNS Kind!", "/build/llvm-toolchain-snapshot-9~svn361465/tools/clang/lib/AST/NestedNameSpecifier.cpp"
, 249)
;
250}
251
252bool NestedNameSpecifier::containsUnexpandedParameterPack() const {
253 switch (getKind()) {
254 case Identifier:
255 return getPrefix() && getPrefix()->containsUnexpandedParameterPack();
256
257 case Namespace:
258 case NamespaceAlias:
259 case Global:
260 case Super:
261 return false;
262
263 case TypeSpec:
264 case TypeSpecWithTemplate:
265 return getAsType()->containsUnexpandedParameterPack();
266 }
267
268 llvm_unreachable("Invalid NNS Kind!")::llvm::llvm_unreachable_internal("Invalid NNS Kind!", "/build/llvm-toolchain-snapshot-9~svn361465/tools/clang/lib/AST/NestedNameSpecifier.cpp"
, 268)
;
269}
270
271/// Print this nested name specifier to the given output
272/// stream.
273void NestedNameSpecifier::print(raw_ostream &OS, const PrintingPolicy &Policy,
274 bool ResolveTemplateArguments) const {
275 if (getPrefix())
276 getPrefix()->print(OS, Policy);
277
278 switch (getKind()) {
279 case Identifier:
280 OS << getAsIdentifier()->getName();
281 break;
282
283 case Namespace:
284 if (getAsNamespace()->isAnonymousNamespace())
285 return;
286
287 OS << getAsNamespace()->getName();
288 break;
289
290 case NamespaceAlias:
291 OS << getAsNamespaceAlias()->getName();
292 break;
293
294 case Global:
295 break;
296
297 case Super:
298 OS << "__super";
299 break;
300
301 case TypeSpecWithTemplate:
302 OS << "template ";
303 // Fall through to print the type.
304 LLVM_FALLTHROUGH[[clang::fallthrough]];
305
306 case TypeSpec: {
307 const auto *Record =
308 dyn_cast_or_null<ClassTemplateSpecializationDecl>(getAsRecordDecl());
309 if (ResolveTemplateArguments && Record) {
310 // Print the type trait with resolved template parameters.
311 Record->printName(OS);
312 printTemplateArgumentList(OS, Record->getTemplateArgs().asArray(),
313 Policy);
314 break;
315 }
316 const Type *T = getAsType();
317
318 PrintingPolicy InnerPolicy(Policy);
319 InnerPolicy.SuppressScope = true;
320
321 // Nested-name-specifiers are intended to contain minimally-qualified
322 // types. An actual ElaboratedType will not occur, since we'll store
323 // just the type that is referred to in the nested-name-specifier (e.g.,
324 // a TypedefType, TagType, etc.). However, when we are dealing with
325 // dependent template-id types (e.g., Outer<T>::template Inner<U>),
326 // the type requires its own nested-name-specifier for uniqueness, so we
327 // suppress that nested-name-specifier during printing.
328 assert(!isa<ElaboratedType>(T) &&((!isa<ElaboratedType>(T) && "Elaborated type in nested-name-specifier"
) ? static_cast<void> (0) : __assert_fail ("!isa<ElaboratedType>(T) && \"Elaborated type in nested-name-specifier\""
, "/build/llvm-toolchain-snapshot-9~svn361465/tools/clang/lib/AST/NestedNameSpecifier.cpp"
, 329, __PRETTY_FUNCTION__))
329 "Elaborated type in nested-name-specifier")((!isa<ElaboratedType>(T) && "Elaborated type in nested-name-specifier"
) ? static_cast<void> (0) : __assert_fail ("!isa<ElaboratedType>(T) && \"Elaborated type in nested-name-specifier\""
, "/build/llvm-toolchain-snapshot-9~svn361465/tools/clang/lib/AST/NestedNameSpecifier.cpp"
, 329, __PRETTY_FUNCTION__))
;
330 if (const TemplateSpecializationType *SpecType
331 = dyn_cast<TemplateSpecializationType>(T)) {
332 // Print the template name without its corresponding
333 // nested-name-specifier.
334 SpecType->getTemplateName().print(OS, InnerPolicy, true);
335
336 // Print the template argument list.
337 printTemplateArgumentList(OS, SpecType->template_arguments(),
338 InnerPolicy);
339 } else {
340 // Print the type normally
341 QualType(T, 0).print(OS, InnerPolicy);
342 }
343 break;
344 }
345 }
346
347 OS << "::";
348}
349
350LLVM_DUMP_METHOD__attribute__((noinline)) __attribute__((__used__)) void NestedNameSpecifier::dump(const LangOptions &LO) const {
351 dump(llvm::errs(), LO);
352}
353
354LLVM_DUMP_METHOD__attribute__((noinline)) __attribute__((__used__)) void NestedNameSpecifier::dump() const { dump(llvm::errs()); }
355
356LLVM_DUMP_METHOD__attribute__((noinline)) __attribute__((__used__)) void NestedNameSpecifier::dump(llvm::raw_ostream &OS) const {
357 LangOptions LO;
358 dump(OS, LO);
359}
360
361LLVM_DUMP_METHOD__attribute__((noinline)) __attribute__((__used__)) void NestedNameSpecifier::dump(llvm::raw_ostream &OS,
362 const LangOptions &LO) const {
363 print(OS, PrintingPolicy(LO));
364}
365
366unsigned
367NestedNameSpecifierLoc::getLocalDataLength(NestedNameSpecifier *Qualifier) {
368 assert(Qualifier && "Expected a non-NULL qualifier")((Qualifier && "Expected a non-NULL qualifier") ? static_cast
<void> (0) : __assert_fail ("Qualifier && \"Expected a non-NULL qualifier\""
, "/build/llvm-toolchain-snapshot-9~svn361465/tools/clang/lib/AST/NestedNameSpecifier.cpp"
, 368, __PRETTY_FUNCTION__))
;
369
370 // Location of the trailing '::'.
371 unsigned Length = sizeof(unsigned);
372
373 switch (Qualifier->getKind()) {
374 case NestedNameSpecifier::Global:
375 // Nothing more to add.
376 break;
377
378 case NestedNameSpecifier::Identifier:
379 case NestedNameSpecifier::Namespace:
380 case NestedNameSpecifier::NamespaceAlias:
381 case NestedNameSpecifier::Super:
382 // The location of the identifier or namespace name.
383 Length += sizeof(unsigned);
384 break;
385
386 case NestedNameSpecifier::TypeSpecWithTemplate:
387 case NestedNameSpecifier::TypeSpec:
388 // The "void*" that points at the TypeLoc data.
389 // Note: the 'template' keyword is part of the TypeLoc.
390 Length += sizeof(void *);
391 break;
392 }
393
394 return Length;
395}
396
397unsigned
398NestedNameSpecifierLoc::getDataLength(NestedNameSpecifier *Qualifier) {
399 unsigned Length = 0;
400 for (; Qualifier; Qualifier = Qualifier->getPrefix())
401 Length += getLocalDataLength(Qualifier);
402 return Length;
403}
404
405/// Load a (possibly unaligned) source location from a given address
406/// and offset.
407static SourceLocation LoadSourceLocation(void *Data, unsigned Offset) {
408 unsigned Raw;
409 memcpy(&Raw, static_cast<char *>(Data) + Offset, sizeof(unsigned));
410 return SourceLocation::getFromRawEncoding(Raw);
411}
412
413/// Load a (possibly unaligned) pointer from a given address and
414/// offset.
415static void *LoadPointer(void *Data, unsigned Offset) {
416 void *Result;
417 memcpy(&Result, static_cast<char *>(Data) + Offset, sizeof(void*));
418 return Result;
419}
420
421SourceRange NestedNameSpecifierLoc::getSourceRange() const {
422 if (!Qualifier)
423 return SourceRange();
424
425 NestedNameSpecifierLoc First = *this;
426 while (NestedNameSpecifierLoc Prefix = First.getPrefix())
427 First = Prefix;
428
429 return SourceRange(First.getLocalSourceRange().getBegin(),
430 getLocalSourceRange().getEnd());
431}
432
433SourceRange NestedNameSpecifierLoc::getLocalSourceRange() const {
434 if (!Qualifier)
435 return SourceRange();
436
437 unsigned Offset = getDataLength(Qualifier->getPrefix());
438 switch (Qualifier->getKind()) {
439 case NestedNameSpecifier::Global:
440 return LoadSourceLocation(Data, Offset);
441
442 case NestedNameSpecifier::Identifier:
443 case NestedNameSpecifier::Namespace:
444 case NestedNameSpecifier::NamespaceAlias:
445 case NestedNameSpecifier::Super:
446 return SourceRange(LoadSourceLocation(Data, Offset),
447 LoadSourceLocation(Data, Offset + sizeof(unsigned)));
448
449 case NestedNameSpecifier::TypeSpecWithTemplate:
450 case NestedNameSpecifier::TypeSpec: {
451 // The "void*" that points at the TypeLoc data.
452 // Note: the 'template' keyword is part of the TypeLoc.
453 void *TypeData = LoadPointer(Data, Offset);
454 TypeLoc TL(Qualifier->getAsType(), TypeData);
455 return SourceRange(TL.getBeginLoc(),
456 LoadSourceLocation(Data, Offset + sizeof(void*)));
457 }
458 }
459
460 llvm_unreachable("Invalid NNS Kind!")::llvm::llvm_unreachable_internal("Invalid NNS Kind!", "/build/llvm-toolchain-snapshot-9~svn361465/tools/clang/lib/AST/NestedNameSpecifier.cpp"
, 460)
;
461}
462
463TypeLoc NestedNameSpecifierLoc::getTypeLoc() const {
464 if (Qualifier->getKind() != NestedNameSpecifier::TypeSpec &&
465 Qualifier->getKind() != NestedNameSpecifier::TypeSpecWithTemplate)
466 return TypeLoc();
467
468 // The "void*" that points at the TypeLoc data.
469 unsigned Offset = getDataLength(Qualifier->getPrefix());
470 void *TypeData = LoadPointer(Data, Offset);
471 return TypeLoc(Qualifier->getAsType(), TypeData);
472}
473
474static void Append(char *Start, char *End, char *&Buffer, unsigned &BufferSize,
475 unsigned &BufferCapacity) {
476 if (Start == End)
8
Assuming 'Start' is not equal to 'End'
9
Taking false branch
477 return;
478
479 if (BufferSize + (End - Start) > BufferCapacity) {
10
Assuming the condition is false
11
Taking false branch
480 // Reallocate the buffer.
481 unsigned NewCapacity = std::max(
482 (unsigned)(BufferCapacity ? BufferCapacity * 2 : sizeof(void *) * 2),
483 (unsigned)(BufferSize + (End - Start)));
484 char *NewBuffer = static_cast<char *>(llvm::safe_malloc(NewCapacity));
485 if (BufferCapacity) {
486 memcpy(NewBuffer, Buffer, BufferSize);
487 free(Buffer);
488 }
489 Buffer = NewBuffer;
490 BufferCapacity = NewCapacity;
491 }
492
493 memcpy(Buffer + BufferSize, Start, End - Start);
12
Null pointer passed as an argument to a 'nonnull' parameter
494 BufferSize += End-Start;
495}
496
497/// Save a source location to the given buffer.
498static void SaveSourceLocation(SourceLocation Loc, char *&Buffer,
499 unsigned &BufferSize, unsigned &BufferCapacity) {
500 unsigned Raw = Loc.getRawEncoding();
501 Append(reinterpret_cast<char *>(&Raw),
502 reinterpret_cast<char *>(&Raw) + sizeof(unsigned),
503 Buffer, BufferSize, BufferCapacity);
504}
505
506/// Save a pointer to the given buffer.
507static void SavePointer(void *Ptr, char *&Buffer, unsigned &BufferSize,
508 unsigned &BufferCapacity) {
509 Append(reinterpret_cast<char *>(&Ptr),
510 reinterpret_cast<char *>(&Ptr) + sizeof(void *),
511 Buffer, BufferSize, BufferCapacity);
512}
513
514NestedNameSpecifierLocBuilder::
515NestedNameSpecifierLocBuilder(const NestedNameSpecifierLocBuilder &Other)
516 : Representation(Other.Representation) {
517 if (!Other.Buffer)
2
Assuming the condition is false
3
Taking false branch
518 return;
519
520 if (Other.BufferCapacity == 0) {
4
Assuming the condition is false
5
Taking false branch
521 // Shallow copy is okay.
522 Buffer = Other.Buffer;
523 BufferSize = Other.BufferSize;
524 return;
525 }
526
527 // Deep copy
528 Append(Other.Buffer, Other.Buffer + Other.BufferSize, Buffer, BufferSize,
6
Passing value via 3rd parameter 'Buffer'
7
Calling 'Append'
529 BufferCapacity);
530}
531
532NestedNameSpecifierLocBuilder &
533NestedNameSpecifierLocBuilder::
534operator=(const NestedNameSpecifierLocBuilder &Other) {
535 Representation = Other.Representation;
536
537 if (Buffer && Other.Buffer && BufferCapacity >= Other.BufferSize) {
538 // Re-use our storage.
539 BufferSize = Other.BufferSize;
540 memcpy(Buffer, Other.Buffer, BufferSize);
541 return *this;
542 }
543
544 // Free our storage, if we have any.
545 if (BufferCapacity) {
546 free(Buffer);
547 BufferCapacity = 0;
548 }
549
550 if (!Other.Buffer) {
551 // Empty.
552 Buffer = nullptr;
553 BufferSize = 0;
554 return *this;
555 }
556
557 if (Other.BufferCapacity == 0) {
558 // Shallow copy is okay.
559 Buffer = Other.Buffer;
560 BufferSize = Other.BufferSize;
561 return *this;
562 }
563
564 // Deep copy.
565 BufferSize = 0;
566 Append(Other.Buffer, Other.Buffer + Other.BufferSize, Buffer, BufferSize,
567 BufferCapacity);
568 return *this;
569}
570
571void NestedNameSpecifierLocBuilder::Extend(ASTContext &Context,
572 SourceLocation TemplateKWLoc,
573 TypeLoc TL,
574 SourceLocation ColonColonLoc) {
575 Representation = NestedNameSpecifier::Create(Context, Representation,
576 TemplateKWLoc.isValid(),
577 TL.getTypePtr());
578
579 // Push source-location info into the buffer.
580 SavePointer(TL.getOpaqueData(), Buffer, BufferSize, BufferCapacity);
581 SaveSourceLocation(ColonColonLoc, Buffer, BufferSize, BufferCapacity);
582}
583
584void NestedNameSpecifierLocBuilder::Extend(ASTContext &Context,
585 IdentifierInfo *Identifier,
586 SourceLocation IdentifierLoc,
587 SourceLocation ColonColonLoc) {
588 Representation = NestedNameSpecifier::Create(Context, Representation,
589 Identifier);
590
591 // Push source-location info into the buffer.
592 SaveSourceLocation(IdentifierLoc, Buffer, BufferSize, BufferCapacity);
593 SaveSourceLocation(ColonColonLoc, Buffer, BufferSize, BufferCapacity);
594}
595
596void NestedNameSpecifierLocBuilder::Extend(ASTContext &Context,
597 NamespaceDecl *Namespace,
598 SourceLocation NamespaceLoc,
599 SourceLocation ColonColonLoc) {
600 Representation = NestedNameSpecifier::Create(Context, Representation,
601 Namespace);
602
603 // Push source-location info into the buffer.
604 SaveSourceLocation(NamespaceLoc, Buffer, BufferSize, BufferCapacity);
605 SaveSourceLocation(ColonColonLoc, Buffer, BufferSize, BufferCapacity);
606}
607
608void NestedNameSpecifierLocBuilder::Extend(ASTContext &Context,
609 NamespaceAliasDecl *Alias,
610 SourceLocation AliasLoc,
611 SourceLocation ColonColonLoc) {
612 Representation = NestedNameSpecifier::Create(Context, Representation, Alias);
613
614 // Push source-location info into the buffer.
615 SaveSourceLocation(AliasLoc, Buffer, BufferSize, BufferCapacity);
616 SaveSourceLocation(ColonColonLoc, Buffer, BufferSize, BufferCapacity);
617}
618
619void NestedNameSpecifierLocBuilder::MakeGlobal(ASTContext &Context,
620 SourceLocation ColonColonLoc) {
621 assert(!Representation && "Already have a nested-name-specifier!?")((!Representation && "Already have a nested-name-specifier!?"
) ? static_cast<void> (0) : __assert_fail ("!Representation && \"Already have a nested-name-specifier!?\""
, "/build/llvm-toolchain-snapshot-9~svn361465/tools/clang/lib/AST/NestedNameSpecifier.cpp"
, 621, __PRETTY_FUNCTION__))
;
622 Representation = NestedNameSpecifier::GlobalSpecifier(Context);
623
624 // Push source-location info into the buffer.
625 SaveSourceLocation(ColonColonLoc, Buffer, BufferSize, BufferCapacity);
626}
627
628void NestedNameSpecifierLocBuilder::MakeSuper(ASTContext &Context,
629 CXXRecordDecl *RD,
630 SourceLocation SuperLoc,
631 SourceLocation ColonColonLoc) {
632 Representation = NestedNameSpecifier::SuperSpecifier(Context, RD);
633
634 // Push source-location info into the buffer.
635 SaveSourceLocation(SuperLoc, Buffer, BufferSize, BufferCapacity);
636 SaveSourceLocation(ColonColonLoc, Buffer, BufferSize, BufferCapacity);
637}
638
639void NestedNameSpecifierLocBuilder::MakeTrivial(ASTContext &Context,
640 NestedNameSpecifier *Qualifier,
641 SourceRange R) {
642 Representation = Qualifier;
643
644 // Construct bogus (but well-formed) source information for the
645 // nested-name-specifier.
646 BufferSize = 0;
647 SmallVector<NestedNameSpecifier *, 4> Stack;
648 for (NestedNameSpecifier *NNS = Qualifier; NNS; NNS = NNS->getPrefix())
649 Stack.push_back(NNS);
650 while (!Stack.empty()) {
651 NestedNameSpecifier *NNS = Stack.pop_back_val();
652 switch (NNS->getKind()) {
653 case NestedNameSpecifier::Identifier:
654 case NestedNameSpecifier::Namespace:
655 case NestedNameSpecifier::NamespaceAlias:
656 SaveSourceLocation(R.getBegin(), Buffer, BufferSize, BufferCapacity);
657 break;
658
659 case NestedNameSpecifier::TypeSpec:
660 case NestedNameSpecifier::TypeSpecWithTemplate: {
661 TypeSourceInfo *TSInfo
662 = Context.getTrivialTypeSourceInfo(QualType(NNS->getAsType(), 0),
663 R.getBegin());
664 SavePointer(TSInfo->getTypeLoc().getOpaqueData(), Buffer, BufferSize,
665 BufferCapacity);
666 break;
667 }
668
669 case NestedNameSpecifier::Global:
670 case NestedNameSpecifier::Super:
671 break;
672 }
673
674 // Save the location of the '::'.
675 SaveSourceLocation(Stack.empty()? R.getEnd() : R.getBegin(),
676 Buffer, BufferSize, BufferCapacity);
677 }
678}
679
680void NestedNameSpecifierLocBuilder::Adopt(NestedNameSpecifierLoc Other) {
681 if (BufferCapacity)
682 free(Buffer);
683
684 if (!Other) {
685 Representation = nullptr;
686 BufferSize = 0;
687 return;
688 }
689
690 // Rather than copying the data (which is wasteful), "adopt" the
691 // pointer (which points into the ASTContext) but set the capacity to zero to
692 // indicate that we don't own it.
693 Representation = Other.getNestedNameSpecifier();
694 Buffer = static_cast<char *>(Other.getOpaqueData());
695 BufferSize = Other.getDataLength();
696 BufferCapacity = 0;
697}
698
699NestedNameSpecifierLoc
700NestedNameSpecifierLocBuilder::getWithLocInContext(ASTContext &Context) const {
701 if (!Representation)
702 return NestedNameSpecifierLoc();
703
704 // If we adopted our data pointer from elsewhere in the AST context, there's
705 // no need to copy the memory.
706 if (BufferCapacity == 0)
707 return NestedNameSpecifierLoc(Representation, Buffer);
708
709 // FIXME: After copying the source-location information, should we free
710 // our (temporary) buffer and adopt the ASTContext-allocated memory?
711 // Doing so would optimize repeated calls to getWithLocInContext().
712 void *Mem = Context.Allocate(BufferSize, alignof(void *));
713 memcpy(Mem, Buffer, BufferSize);
714 return NestedNameSpecifierLoc(Representation, Mem);
715}