Bug Summary

File:tools/clang/lib/AST/NestedNameSpecifier.cpp
Warning:line 478, column 3
Null pointer passed as an argument to a 'nonnull' parameter

Annotated Source Code

1//===- NestedNameSpecifier.cpp - C++ nested name specifiers ---------------===//
2//
3// The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file defines the NestedNameSpecifier class, which represents
11// a C++ nested-name-specifier.
12//
13//===----------------------------------------------------------------------===//
14
15#include "clang/AST/NestedNameSpecifier.h"
16#include "clang/AST/ASTContext.h"
17#include "clang/AST/Decl.h"
18#include "clang/AST/DeclCXX.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")(static_cast <bool> (II && "Identifier cannot be NULL"
) ? void (0) : __assert_fail ("II && \"Identifier cannot be NULL\""
, "/build/llvm-toolchain-snapshot-6.0~svn320940/tools/clang/lib/AST/NestedNameSpecifier.cpp"
, 60, __extension__ __PRETTY_FUNCTION__))
;
61 assert((!Prefix || Prefix->isDependent()) && "Prefix must be dependent")(static_cast <bool> ((!Prefix || Prefix->isDependent
()) && "Prefix must be dependent") ? void (0) : __assert_fail
("(!Prefix || Prefix->isDependent()) && \"Prefix must be dependent\""
, "/build/llvm-toolchain-snapshot-6.0~svn320940/tools/clang/lib/AST/NestedNameSpecifier.cpp"
, 61, __extension__ __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")(static_cast <bool> (NS && "Namespace cannot be NULL"
) ? void (0) : __assert_fail ("NS && \"Namespace cannot be NULL\""
, "/build/llvm-toolchain-snapshot-6.0~svn320940/tools/clang/lib/AST/NestedNameSpecifier.cpp"
, 74, __extension__ __PRETTY_FUNCTION__))
;
75 assert((!Prefix ||(static_cast <bool> ((!Prefix || (Prefix->getAsType(
) == nullptr && Prefix->getAsIdentifier() == nullptr
)) && "Broken nested name specifier") ? void (0) : __assert_fail
("(!Prefix || (Prefix->getAsType() == nullptr && Prefix->getAsIdentifier() == nullptr)) && \"Broken nested name specifier\""
, "/build/llvm-toolchain-snapshot-6.0~svn320940/tools/clang/lib/AST/NestedNameSpecifier.cpp"
, 78, __extension__ __PRETTY_FUNCTION__))
76 (Prefix->getAsType() == nullptr &&(static_cast <bool> ((!Prefix || (Prefix->getAsType(
) == nullptr && Prefix->getAsIdentifier() == nullptr
)) && "Broken nested name specifier") ? void (0) : __assert_fail
("(!Prefix || (Prefix->getAsType() == nullptr && Prefix->getAsIdentifier() == nullptr)) && \"Broken nested name specifier\""
, "/build/llvm-toolchain-snapshot-6.0~svn320940/tools/clang/lib/AST/NestedNameSpecifier.cpp"
, 78, __extension__ __PRETTY_FUNCTION__))
77 Prefix->getAsIdentifier() == nullptr)) &&(static_cast <bool> ((!Prefix || (Prefix->getAsType(
) == nullptr && Prefix->getAsIdentifier() == nullptr
)) && "Broken nested name specifier") ? void (0) : __assert_fail
("(!Prefix || (Prefix->getAsType() == nullptr && Prefix->getAsIdentifier() == nullptr)) && \"Broken nested name specifier\""
, "/build/llvm-toolchain-snapshot-6.0~svn320940/tools/clang/lib/AST/NestedNameSpecifier.cpp"
, 78, __extension__ __PRETTY_FUNCTION__))
78 "Broken nested name specifier")(static_cast <bool> ((!Prefix || (Prefix->getAsType(
) == nullptr && Prefix->getAsIdentifier() == nullptr
)) && "Broken nested name specifier") ? void (0) : __assert_fail
("(!Prefix || (Prefix->getAsType() == nullptr && Prefix->getAsIdentifier() == nullptr)) && \"Broken nested name specifier\""
, "/build/llvm-toolchain-snapshot-6.0~svn320940/tools/clang/lib/AST/NestedNameSpecifier.cpp"
, 78, __extension__ __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")(static_cast <bool> (Alias && "Namespace alias cannot be NULL"
) ? void (0) : __assert_fail ("Alias && \"Namespace alias cannot be NULL\""
, "/build/llvm-toolchain-snapshot-6.0~svn320940/tools/clang/lib/AST/NestedNameSpecifier.cpp"
, 90, __extension__ __PRETTY_FUNCTION__))
;
91 assert((!Prefix ||(static_cast <bool> ((!Prefix || (Prefix->getAsType(
) == nullptr && Prefix->getAsIdentifier() == nullptr
)) && "Broken nested name specifier") ? void (0) : __assert_fail
("(!Prefix || (Prefix->getAsType() == nullptr && Prefix->getAsIdentifier() == nullptr)) && \"Broken nested name specifier\""
, "/build/llvm-toolchain-snapshot-6.0~svn320940/tools/clang/lib/AST/NestedNameSpecifier.cpp"
, 94, __extension__ __PRETTY_FUNCTION__))
92 (Prefix->getAsType() == nullptr &&(static_cast <bool> ((!Prefix || (Prefix->getAsType(
) == nullptr && Prefix->getAsIdentifier() == nullptr
)) && "Broken nested name specifier") ? void (0) : __assert_fail
("(!Prefix || (Prefix->getAsType() == nullptr && Prefix->getAsIdentifier() == nullptr)) && \"Broken nested name specifier\""
, "/build/llvm-toolchain-snapshot-6.0~svn320940/tools/clang/lib/AST/NestedNameSpecifier.cpp"
, 94, __extension__ __PRETTY_FUNCTION__))
93 Prefix->getAsIdentifier() == nullptr)) &&(static_cast <bool> ((!Prefix || (Prefix->getAsType(
) == nullptr && Prefix->getAsIdentifier() == nullptr
)) && "Broken nested name specifier") ? void (0) : __assert_fail
("(!Prefix || (Prefix->getAsType() == nullptr && Prefix->getAsIdentifier() == nullptr)) && \"Broken nested name specifier\""
, "/build/llvm-toolchain-snapshot-6.0~svn320940/tools/clang/lib/AST/NestedNameSpecifier.cpp"
, 94, __extension__ __PRETTY_FUNCTION__))
94 "Broken nested name specifier")(static_cast <bool> ((!Prefix || (Prefix->getAsType(
) == nullptr && Prefix->getAsIdentifier() == nullptr
)) && "Broken nested name specifier") ? void (0) : __assert_fail
("(!Prefix || (Prefix->getAsType() == nullptr && Prefix->getAsIdentifier() == nullptr)) && \"Broken nested name specifier\""
, "/build/llvm-toolchain-snapshot-6.0~svn320940/tools/clang/lib/AST/NestedNameSpecifier.cpp"
, 94, __extension__ __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")(static_cast <bool> (T && "Type cannot be NULL"
) ? void (0) : __assert_fail ("T && \"Type cannot be NULL\""
, "/build/llvm-toolchain-snapshot-6.0~svn320940/tools/clang/lib/AST/NestedNameSpecifier.cpp"
, 106, __extension__ __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")(static_cast <bool> (II && "Identifier cannot be NULL"
) ? void (0) : __assert_fail ("II && \"Identifier cannot be NULL\""
, "/build/llvm-toolchain-snapshot-6.0~svn320940/tools/clang/lib/AST/NestedNameSpecifier.cpp"
, 116, __extension__ __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-6.0~svn320940/tools/clang/lib/AST/NestedNameSpecifier.cpp"
, 164)
;
165}
166
167/// \brief 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/// \brief 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/// \brief 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-6.0~svn320940/tools/clang/lib/AST/NestedNameSpecifier.cpp"
, 197)
;
198}
199
200/// \brief 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-6.0~svn320940/tools/clang/lib/AST/NestedNameSpecifier.cpp"
, 227)
;
228}
229
230/// \brief 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-6.0~svn320940/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-6.0~svn320940/tools/clang/lib/AST/NestedNameSpecifier.cpp"
, 268)
;
269}
270
271/// \brief Print this nested name specifier to the given output
272/// stream.
273void
274NestedNameSpecifier::print(raw_ostream &OS,
275 const PrintingPolicy &Policy) const {
276 if (getPrefix())
277 getPrefix()->print(OS, Policy);
278
279 switch (getKind()) {
280 case Identifier:
281 OS << getAsIdentifier()->getName();
282 break;
283
284 case Namespace:
285 if (getAsNamespace()->isAnonymousNamespace())
286 return;
287
288 OS << getAsNamespace()->getName();
289 break;
290
291 case NamespaceAlias:
292 OS << getAsNamespaceAlias()->getName();
293 break;
294
295 case Global:
296 break;
297
298 case Super:
299 OS << "__super";
300 break;
301
302 case TypeSpecWithTemplate:
303 OS << "template ";
304 // Fall through to print the type.
305 LLVM_FALLTHROUGH[[clang::fallthrough]];
306
307 case TypeSpec: {
308 const Type *T = getAsType();
309
310 PrintingPolicy InnerPolicy(Policy);
311 InnerPolicy.SuppressScope = true;
312
313 // Nested-name-specifiers are intended to contain minimally-qualified
314 // types. An actual ElaboratedType will not occur, since we'll store
315 // just the type that is referred to in the nested-name-specifier (e.g.,
316 // a TypedefType, TagType, etc.). However, when we are dealing with
317 // dependent template-id types (e.g., Outer<T>::template Inner<U>),
318 // the type requires its own nested-name-specifier for uniqueness, so we
319 // suppress that nested-name-specifier during printing.
320 assert(!isa<ElaboratedType>(T) &&(static_cast <bool> (!isa<ElaboratedType>(T) &&
"Elaborated type in nested-name-specifier") ? void (0) : __assert_fail
("!isa<ElaboratedType>(T) && \"Elaborated type in nested-name-specifier\""
, "/build/llvm-toolchain-snapshot-6.0~svn320940/tools/clang/lib/AST/NestedNameSpecifier.cpp"
, 321, __extension__ __PRETTY_FUNCTION__))
321 "Elaborated type in nested-name-specifier")(static_cast <bool> (!isa<ElaboratedType>(T) &&
"Elaborated type in nested-name-specifier") ? void (0) : __assert_fail
("!isa<ElaboratedType>(T) && \"Elaborated type in nested-name-specifier\""
, "/build/llvm-toolchain-snapshot-6.0~svn320940/tools/clang/lib/AST/NestedNameSpecifier.cpp"
, 321, __extension__ __PRETTY_FUNCTION__))
;
322 if (const TemplateSpecializationType *SpecType
323 = dyn_cast<TemplateSpecializationType>(T)) {
324 // Print the template name without its corresponding
325 // nested-name-specifier.
326 SpecType->getTemplateName().print(OS, InnerPolicy, true);
327
328 // Print the template argument list.
329 printTemplateArgumentList(OS, SpecType->template_arguments(),
330 InnerPolicy);
331 } else {
332 // Print the type normally
333 QualType(T, 0).print(OS, InnerPolicy);
334 }
335 break;
336 }
337 }
338
339 OS << "::";
340}
341
342void NestedNameSpecifier::dump(const LangOptions &LO) const {
343 print(llvm::errs(), PrintingPolicy(LO));
344}
345
346LLVM_DUMP_METHOD__attribute__((noinline)) __attribute__((__used__)) void NestedNameSpecifier::dump() const {
347 LangOptions LO;
348 print(llvm::errs(), PrintingPolicy(LO));
349}
350
351unsigned
352NestedNameSpecifierLoc::getLocalDataLength(NestedNameSpecifier *Qualifier) {
353 assert(Qualifier && "Expected a non-NULL qualifier")(static_cast <bool> (Qualifier && "Expected a non-NULL qualifier"
) ? void (0) : __assert_fail ("Qualifier && \"Expected a non-NULL qualifier\""
, "/build/llvm-toolchain-snapshot-6.0~svn320940/tools/clang/lib/AST/NestedNameSpecifier.cpp"
, 353, __extension__ __PRETTY_FUNCTION__))
;
354
355 // Location of the trailing '::'.
356 unsigned Length = sizeof(unsigned);
357
358 switch (Qualifier->getKind()) {
359 case NestedNameSpecifier::Global:
360 // Nothing more to add.
361 break;
362
363 case NestedNameSpecifier::Identifier:
364 case NestedNameSpecifier::Namespace:
365 case NestedNameSpecifier::NamespaceAlias:
366 case NestedNameSpecifier::Super:
367 // The location of the identifier or namespace name.
368 Length += sizeof(unsigned);
369 break;
370
371 case NestedNameSpecifier::TypeSpecWithTemplate:
372 case NestedNameSpecifier::TypeSpec:
373 // The "void*" that points at the TypeLoc data.
374 // Note: the 'template' keyword is part of the TypeLoc.
375 Length += sizeof(void *);
376 break;
377 }
378
379 return Length;
380}
381
382unsigned
383NestedNameSpecifierLoc::getDataLength(NestedNameSpecifier *Qualifier) {
384 unsigned Length = 0;
385 for (; Qualifier; Qualifier = Qualifier->getPrefix())
386 Length += getLocalDataLength(Qualifier);
387 return Length;
388}
389
390/// \brief Load a (possibly unaligned) source location from a given address
391/// and offset.
392static SourceLocation LoadSourceLocation(void *Data, unsigned Offset) {
393 unsigned Raw;
394 memcpy(&Raw, static_cast<char *>(Data) + Offset, sizeof(unsigned));
395 return SourceLocation::getFromRawEncoding(Raw);
396}
397
398/// \brief Load a (possibly unaligned) pointer from a given address and
399/// offset.
400static void *LoadPointer(void *Data, unsigned Offset) {
401 void *Result;
402 memcpy(&Result, static_cast<char *>(Data) + Offset, sizeof(void*));
403 return Result;
404}
405
406SourceRange NestedNameSpecifierLoc::getSourceRange() const {
407 if (!Qualifier)
408 return SourceRange();
409
410 NestedNameSpecifierLoc First = *this;
411 while (NestedNameSpecifierLoc Prefix = First.getPrefix())
412 First = Prefix;
413
414 return SourceRange(First.getLocalSourceRange().getBegin(),
415 getLocalSourceRange().getEnd());
416}
417
418SourceRange NestedNameSpecifierLoc::getLocalSourceRange() const {
419 if (!Qualifier)
420 return SourceRange();
421
422 unsigned Offset = getDataLength(Qualifier->getPrefix());
423 switch (Qualifier->getKind()) {
424 case NestedNameSpecifier::Global:
425 return LoadSourceLocation(Data, Offset);
426
427 case NestedNameSpecifier::Identifier:
428 case NestedNameSpecifier::Namespace:
429 case NestedNameSpecifier::NamespaceAlias:
430 case NestedNameSpecifier::Super:
431 return SourceRange(LoadSourceLocation(Data, Offset),
432 LoadSourceLocation(Data, Offset + sizeof(unsigned)));
433
434 case NestedNameSpecifier::TypeSpecWithTemplate:
435 case NestedNameSpecifier::TypeSpec: {
436 // The "void*" that points at the TypeLoc data.
437 // Note: the 'template' keyword is part of the TypeLoc.
438 void *TypeData = LoadPointer(Data, Offset);
439 TypeLoc TL(Qualifier->getAsType(), TypeData);
440 return SourceRange(TL.getBeginLoc(),
441 LoadSourceLocation(Data, Offset + sizeof(void*)));
442 }
443 }
444
445 llvm_unreachable("Invalid NNS Kind!")::llvm::llvm_unreachable_internal("Invalid NNS Kind!", "/build/llvm-toolchain-snapshot-6.0~svn320940/tools/clang/lib/AST/NestedNameSpecifier.cpp"
, 445)
;
446}
447
448TypeLoc NestedNameSpecifierLoc::getTypeLoc() const {
449 assert((Qualifier->getKind() == NestedNameSpecifier::TypeSpec ||(static_cast <bool> ((Qualifier->getKind() == NestedNameSpecifier
::TypeSpec || Qualifier->getKind() == NestedNameSpecifier::
TypeSpecWithTemplate) && "Nested-name-specifier location is not a type"
) ? void (0) : __assert_fail ("(Qualifier->getKind() == NestedNameSpecifier::TypeSpec || Qualifier->getKind() == NestedNameSpecifier::TypeSpecWithTemplate) && \"Nested-name-specifier location is not a type\""
, "/build/llvm-toolchain-snapshot-6.0~svn320940/tools/clang/lib/AST/NestedNameSpecifier.cpp"
, 451, __extension__ __PRETTY_FUNCTION__))
450 Qualifier->getKind() == NestedNameSpecifier::TypeSpecWithTemplate) &&(static_cast <bool> ((Qualifier->getKind() == NestedNameSpecifier
::TypeSpec || Qualifier->getKind() == NestedNameSpecifier::
TypeSpecWithTemplate) && "Nested-name-specifier location is not a type"
) ? void (0) : __assert_fail ("(Qualifier->getKind() == NestedNameSpecifier::TypeSpec || Qualifier->getKind() == NestedNameSpecifier::TypeSpecWithTemplate) && \"Nested-name-specifier location is not a type\""
, "/build/llvm-toolchain-snapshot-6.0~svn320940/tools/clang/lib/AST/NestedNameSpecifier.cpp"
, 451, __extension__ __PRETTY_FUNCTION__))
451 "Nested-name-specifier location is not a type")(static_cast <bool> ((Qualifier->getKind() == NestedNameSpecifier
::TypeSpec || Qualifier->getKind() == NestedNameSpecifier::
TypeSpecWithTemplate) && "Nested-name-specifier location is not a type"
) ? void (0) : __assert_fail ("(Qualifier->getKind() == NestedNameSpecifier::TypeSpec || Qualifier->getKind() == NestedNameSpecifier::TypeSpecWithTemplate) && \"Nested-name-specifier location is not a type\""
, "/build/llvm-toolchain-snapshot-6.0~svn320940/tools/clang/lib/AST/NestedNameSpecifier.cpp"
, 451, __extension__ __PRETTY_FUNCTION__))
;
452
453 // The "void*" that points at the TypeLoc data.
454 unsigned Offset = getDataLength(Qualifier->getPrefix());
455 void *TypeData = LoadPointer(Data, Offset);
456 return TypeLoc(Qualifier->getAsType(), TypeData);
457}
458
459static void Append(char *Start, char *End, char *&Buffer, unsigned &BufferSize,
460 unsigned &BufferCapacity) {
461 if (Start == End)
6
Taking false branch
462 return;
463
464 if (BufferSize + (End - Start) > BufferCapacity) {
7
Taking false branch
465 // Reallocate the buffer.
466 unsigned NewCapacity = std::max(
467 (unsigned)(BufferCapacity ? BufferCapacity * 2 : sizeof(void *) * 2),
468 (unsigned)(BufferSize + (End - Start)));
469 char *NewBuffer = static_cast<char *>(malloc(NewCapacity));
470 if (BufferCapacity) {
471 memcpy(NewBuffer, Buffer, BufferSize);
472 free(Buffer);
473 }
474 Buffer = NewBuffer;
475 BufferCapacity = NewCapacity;
476 }
477
478 memcpy(Buffer + BufferSize, Start, End - Start);
8
Null pointer passed as an argument to a 'nonnull' parameter
479 BufferSize += End-Start;
480}
481
482/// \brief Save a source location to the given buffer.
483static void SaveSourceLocation(SourceLocation Loc, char *&Buffer,
484 unsigned &BufferSize, unsigned &BufferCapacity) {
485 unsigned Raw = Loc.getRawEncoding();
486 Append(reinterpret_cast<char *>(&Raw),
487 reinterpret_cast<char *>(&Raw) + sizeof(unsigned),
488 Buffer, BufferSize, BufferCapacity);
489}
490
491/// \brief Save a pointer to the given buffer.
492static void SavePointer(void *Ptr, char *&Buffer, unsigned &BufferSize,
493 unsigned &BufferCapacity) {
494 Append(reinterpret_cast<char *>(&Ptr),
495 reinterpret_cast<char *>(&Ptr) + sizeof(void *),
496 Buffer, BufferSize, BufferCapacity);
497}
498
499NestedNameSpecifierLocBuilder::
500NestedNameSpecifierLocBuilder(const NestedNameSpecifierLocBuilder &Other)
501 : Representation(Other.Representation) {
502 if (!Other.Buffer)
1
Assuming the condition is false
2
Taking false branch
503 return;
504
505 if (Other.BufferCapacity == 0) {
3
Assuming the condition is false
4
Taking false branch
506 // Shallow copy is okay.
507 Buffer = Other.Buffer;
508 BufferSize = Other.BufferSize;
509 return;
510 }
511
512 // Deep copy
513 Append(Other.Buffer, Other.Buffer + Other.BufferSize, Buffer, BufferSize,
5
Calling 'Append'
514 BufferCapacity);
515}
516
517NestedNameSpecifierLocBuilder &
518NestedNameSpecifierLocBuilder::
519operator=(const NestedNameSpecifierLocBuilder &Other) {
520 Representation = Other.Representation;
521
522 if (Buffer && Other.Buffer && BufferCapacity >= Other.BufferSize) {
523 // Re-use our storage.
524 BufferSize = Other.BufferSize;
525 memcpy(Buffer, Other.Buffer, BufferSize);
526 return *this;
527 }
528
529 // Free our storage, if we have any.
530 if (BufferCapacity) {
531 free(Buffer);
532 BufferCapacity = 0;
533 }
534
535 if (!Other.Buffer) {
536 // Empty.
537 Buffer = nullptr;
538 BufferSize = 0;
539 return *this;
540 }
541
542 if (Other.BufferCapacity == 0) {
543 // Shallow copy is okay.
544 Buffer = Other.Buffer;
545 BufferSize = Other.BufferSize;
546 return *this;
547 }
548
549 // Deep copy.
550 Append(Other.Buffer, Other.Buffer + Other.BufferSize, Buffer, BufferSize,
551 BufferCapacity);
552 return *this;
553}
554
555void NestedNameSpecifierLocBuilder::Extend(ASTContext &Context,
556 SourceLocation TemplateKWLoc,
557 TypeLoc TL,
558 SourceLocation ColonColonLoc) {
559 Representation = NestedNameSpecifier::Create(Context, Representation,
560 TemplateKWLoc.isValid(),
561 TL.getTypePtr());
562
563 // Push source-location info into the buffer.
564 SavePointer(TL.getOpaqueData(), Buffer, BufferSize, BufferCapacity);
565 SaveSourceLocation(ColonColonLoc, Buffer, BufferSize, BufferCapacity);
566}
567
568void NestedNameSpecifierLocBuilder::Extend(ASTContext &Context,
569 IdentifierInfo *Identifier,
570 SourceLocation IdentifierLoc,
571 SourceLocation ColonColonLoc) {
572 Representation = NestedNameSpecifier::Create(Context, Representation,
573 Identifier);
574
575 // Push source-location info into the buffer.
576 SaveSourceLocation(IdentifierLoc, Buffer, BufferSize, BufferCapacity);
577 SaveSourceLocation(ColonColonLoc, Buffer, BufferSize, BufferCapacity);
578}
579
580void NestedNameSpecifierLocBuilder::Extend(ASTContext &Context,
581 NamespaceDecl *Namespace,
582 SourceLocation NamespaceLoc,
583 SourceLocation ColonColonLoc) {
584 Representation = NestedNameSpecifier::Create(Context, Representation,
585 Namespace);
586
587 // Push source-location info into the buffer.
588 SaveSourceLocation(NamespaceLoc, Buffer, BufferSize, BufferCapacity);
589 SaveSourceLocation(ColonColonLoc, Buffer, BufferSize, BufferCapacity);
590}
591
592void NestedNameSpecifierLocBuilder::Extend(ASTContext &Context,
593 NamespaceAliasDecl *Alias,
594 SourceLocation AliasLoc,
595 SourceLocation ColonColonLoc) {
596 Representation = NestedNameSpecifier::Create(Context, Representation, Alias);
597
598 // Push source-location info into the buffer.
599 SaveSourceLocation(AliasLoc, Buffer, BufferSize, BufferCapacity);
600 SaveSourceLocation(ColonColonLoc, Buffer, BufferSize, BufferCapacity);
601}
602
603void NestedNameSpecifierLocBuilder::MakeGlobal(ASTContext &Context,
604 SourceLocation ColonColonLoc) {
605 assert(!Representation && "Already have a nested-name-specifier!?")(static_cast <bool> (!Representation && "Already have a nested-name-specifier!?"
) ? void (0) : __assert_fail ("!Representation && \"Already have a nested-name-specifier!?\""
, "/build/llvm-toolchain-snapshot-6.0~svn320940/tools/clang/lib/AST/NestedNameSpecifier.cpp"
, 605, __extension__ __PRETTY_FUNCTION__))
;
606 Representation = NestedNameSpecifier::GlobalSpecifier(Context);
607
608 // Push source-location info into the buffer.
609 SaveSourceLocation(ColonColonLoc, Buffer, BufferSize, BufferCapacity);
610}
611
612void NestedNameSpecifierLocBuilder::MakeSuper(ASTContext &Context,
613 CXXRecordDecl *RD,
614 SourceLocation SuperLoc,
615 SourceLocation ColonColonLoc) {
616 Representation = NestedNameSpecifier::SuperSpecifier(Context, RD);
617
618 // Push source-location info into the buffer.
619 SaveSourceLocation(SuperLoc, Buffer, BufferSize, BufferCapacity);
620 SaveSourceLocation(ColonColonLoc, Buffer, BufferSize, BufferCapacity);
621}
622
623void NestedNameSpecifierLocBuilder::MakeTrivial(ASTContext &Context,
624 NestedNameSpecifier *Qualifier,
625 SourceRange R) {
626 Representation = Qualifier;
627
628 // Construct bogus (but well-formed) source information for the
629 // nested-name-specifier.
630 BufferSize = 0;
631 SmallVector<NestedNameSpecifier *, 4> Stack;
632 for (NestedNameSpecifier *NNS = Qualifier; NNS; NNS = NNS->getPrefix())
633 Stack.push_back(NNS);
634 while (!Stack.empty()) {
635 NestedNameSpecifier *NNS = Stack.pop_back_val();
636 switch (NNS->getKind()) {
637 case NestedNameSpecifier::Identifier:
638 case NestedNameSpecifier::Namespace:
639 case NestedNameSpecifier::NamespaceAlias:
640 SaveSourceLocation(R.getBegin(), Buffer, BufferSize, BufferCapacity);
641 break;
642
643 case NestedNameSpecifier::TypeSpec:
644 case NestedNameSpecifier::TypeSpecWithTemplate: {
645 TypeSourceInfo *TSInfo
646 = Context.getTrivialTypeSourceInfo(QualType(NNS->getAsType(), 0),
647 R.getBegin());
648 SavePointer(TSInfo->getTypeLoc().getOpaqueData(), Buffer, BufferSize,
649 BufferCapacity);
650 break;
651 }
652
653 case NestedNameSpecifier::Global:
654 case NestedNameSpecifier::Super:
655 break;
656 }
657
658 // Save the location of the '::'.
659 SaveSourceLocation(Stack.empty()? R.getEnd() : R.getBegin(),
660 Buffer, BufferSize, BufferCapacity);
661 }
662}
663
664void NestedNameSpecifierLocBuilder::Adopt(NestedNameSpecifierLoc Other) {
665 if (BufferCapacity)
666 free(Buffer);
667
668 if (!Other) {
669 Representation = nullptr;
670 BufferSize = 0;
671 return;
672 }
673
674 // Rather than copying the data (which is wasteful), "adopt" the
675 // pointer (which points into the ASTContext) but set the capacity to zero to
676 // indicate that we don't own it.
677 Representation = Other.getNestedNameSpecifier();
678 Buffer = static_cast<char *>(Other.getOpaqueData());
679 BufferSize = Other.getDataLength();
680 BufferCapacity = 0;
681}
682
683NestedNameSpecifierLoc
684NestedNameSpecifierLocBuilder::getWithLocInContext(ASTContext &Context) const {
685 if (!Representation)
686 return NestedNameSpecifierLoc();
687
688 // If we adopted our data pointer from elsewhere in the AST context, there's
689 // no need to copy the memory.
690 if (BufferCapacity == 0)
691 return NestedNameSpecifierLoc(Representation, Buffer);
692
693 // FIXME: After copying the source-location information, should we free
694 // our (temporary) buffer and adopt the ASTContext-allocated memory?
695 // Doing so would optimize repeated calls to getWithLocInContext().
696 void *Mem = Context.Allocate(BufferSize, alignof(void *));
697 memcpy(Mem, Buffer, BufferSize);
698 return NestedNameSpecifierLoc(Representation, Mem);
699}