Bug Summary

File:tools/clang/lib/Frontend/PrintPreprocessedOutput.cpp
Warning:line 892, column 3
Use of memory after it is freed

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 PrintPreprocessedOutput.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-eagerly-assume -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 -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-7/lib/clang/7.0.0 -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-7~svn329677/build-llvm/tools/clang/lib/Frontend -I /build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Frontend -I /build/llvm-toolchain-snapshot-7~svn329677/tools/clang/include -I /build/llvm-toolchain-snapshot-7~svn329677/build-llvm/tools/clang/include -I /build/llvm-toolchain-snapshot-7~svn329677/build-llvm/include -I /build/llvm-toolchain-snapshot-7~svn329677/include -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/c++/7.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/x86_64-linux-gnu/c++/7.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/x86_64-linux-gnu/c++/7.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/c++/7.3.0/backward -internal-isystem /usr/include/clang/7.0.0/include/ -internal-isystem /usr/local/include -internal-isystem /usr/lib/llvm-7/lib/clang/7.0.0/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-7~svn329677/build-llvm/tools/clang/lib/Frontend -ferror-limit 19 -fmessage-length 0 -fvisibility-inlines-hidden -fobjc-runtime=gcc -fno-common -fdiagnostics-show-option -vectorize-loops -vectorize-slp -analyzer-checker optin.performance.Padding -analyzer-output=html -analyzer-config stable-report-filename=true -o /tmp/scan-build-2018-04-11-031539-24776-1 -x c++ /build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Frontend/PrintPreprocessedOutput.cpp

/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Frontend/PrintPreprocessedOutput.cpp

1//===--- PrintPreprocessedOutput.cpp - Implement the -E mode --------------===//
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 code simply runs the preprocessor on the input file and prints out the
11// result. This is the traditional behavior of the -E option.
12//
13//===----------------------------------------------------------------------===//
14
15#include "clang/Frontend/Utils.h"
16#include "clang/Basic/CharInfo.h"
17#include "clang/Basic/Diagnostic.h"
18#include "clang/Basic/SourceManager.h"
19#include "clang/Frontend/PreprocessorOutputOptions.h"
20#include "clang/Lex/MacroInfo.h"
21#include "clang/Lex/PPCallbacks.h"
22#include "clang/Lex/Pragma.h"
23#include "clang/Lex/Preprocessor.h"
24#include "clang/Lex/TokenConcatenation.h"
25#include "llvm/ADT/STLExtras.h"
26#include "llvm/ADT/SmallString.h"
27#include "llvm/ADT/StringRef.h"
28#include "llvm/Support/ErrorHandling.h"
29#include "llvm/Support/raw_ostream.h"
30#include <cstdio>
31using namespace clang;
32
33/// PrintMacroDefinition - Print a macro definition in a form that will be
34/// properly accepted back as a definition.
35static void PrintMacroDefinition(const IdentifierInfo &II, const MacroInfo &MI,
36 Preprocessor &PP, raw_ostream &OS) {
37 OS << "#define " << II.getName();
38
39 if (MI.isFunctionLike()) {
40 OS << '(';
41 if (!MI.param_empty()) {
42 MacroInfo::param_iterator AI = MI.param_begin(), E = MI.param_end();
43 for (; AI+1 != E; ++AI) {
44 OS << (*AI)->getName();
45 OS << ',';
46 }
47
48 // Last argument.
49 if ((*AI)->getName() == "__VA_ARGS__")
50 OS << "...";
51 else
52 OS << (*AI)->getName();
53 }
54
55 if (MI.isGNUVarargs())
56 OS << "..."; // #define foo(x...)
57
58 OS << ')';
59 }
60
61 // GCC always emits a space, even if the macro body is empty. However, do not
62 // want to emit two spaces if the first token has a leading space.
63 if (MI.tokens_empty() || !MI.tokens_begin()->hasLeadingSpace())
64 OS << ' ';
65
66 SmallString<128> SpellingBuffer;
67 for (const auto &T : MI.tokens()) {
68 if (T.hasLeadingSpace())
69 OS << ' ';
70
71 OS << PP.getSpelling(T, SpellingBuffer);
72 }
73}
74
75//===----------------------------------------------------------------------===//
76// Preprocessed token printer
77//===----------------------------------------------------------------------===//
78
79namespace {
80class PrintPPOutputPPCallbacks : public PPCallbacks {
81 Preprocessor &PP;
82 SourceManager &SM;
83 TokenConcatenation ConcatInfo;
84public:
85 raw_ostream &OS;
86private:
87 unsigned CurLine;
88
89 bool EmittedTokensOnThisLine;
90 bool EmittedDirectiveOnThisLine;
91 SrcMgr::CharacteristicKind FileType;
92 SmallString<512> CurFilename;
93 bool Initialized;
94 bool DisableLineMarkers;
95 bool DumpDefines;
96 bool DumpIncludeDirectives;
97 bool UseLineDirectives;
98 bool IsFirstFileEntered;
99public:
100 PrintPPOutputPPCallbacks(Preprocessor &pp, raw_ostream &os, bool lineMarkers,
101 bool defines, bool DumpIncludeDirectives,
102 bool UseLineDirectives)
103 : PP(pp), SM(PP.getSourceManager()), ConcatInfo(PP), OS(os),
104 DisableLineMarkers(lineMarkers), DumpDefines(defines),
105 DumpIncludeDirectives(DumpIncludeDirectives),
106 UseLineDirectives(UseLineDirectives) {
107 CurLine = 0;
108 CurFilename += "<uninit>";
109 EmittedTokensOnThisLine = false;
110 EmittedDirectiveOnThisLine = false;
111 FileType = SrcMgr::C_User;
112 Initialized = false;
113 IsFirstFileEntered = false;
114 }
115
116 void setEmittedTokensOnThisLine() { EmittedTokensOnThisLine = true; }
117 bool hasEmittedTokensOnThisLine() const { return EmittedTokensOnThisLine; }
118
119 void setEmittedDirectiveOnThisLine() { EmittedDirectiveOnThisLine = true; }
120 bool hasEmittedDirectiveOnThisLine() const {
121 return EmittedDirectiveOnThisLine;
122 }
123
124 bool startNewLineIfNeeded(bool ShouldUpdateCurrentLine = true);
125
126 void FileChanged(SourceLocation Loc, FileChangeReason Reason,
127 SrcMgr::CharacteristicKind FileType,
128 FileID PrevFID) override;
129 void InclusionDirective(SourceLocation HashLoc, const Token &IncludeTok,
130 StringRef FileName, bool IsAngled,
131 CharSourceRange FilenameRange, const FileEntry *File,
132 StringRef SearchPath, StringRef RelativePath,
133 const Module *Imported) override;
134 void Ident(SourceLocation Loc, StringRef str) override;
135 void PragmaMessage(SourceLocation Loc, StringRef Namespace,
136 PragmaMessageKind Kind, StringRef Str) override;
137 void PragmaDebug(SourceLocation Loc, StringRef DebugType) override;
138 void PragmaDiagnosticPush(SourceLocation Loc, StringRef Namespace) override;
139 void PragmaDiagnosticPop(SourceLocation Loc, StringRef Namespace) override;
140 void PragmaDiagnostic(SourceLocation Loc, StringRef Namespace,
141 diag::Severity Map, StringRef Str) override;
142 void PragmaWarning(SourceLocation Loc, StringRef WarningSpec,
143 ArrayRef<int> Ids) override;
144 void PragmaWarningPush(SourceLocation Loc, int Level) override;
145 void PragmaWarningPop(SourceLocation Loc) override;
146 void PragmaAssumeNonNullBegin(SourceLocation Loc) override;
147 void PragmaAssumeNonNullEnd(SourceLocation Loc) override;
148
149 bool HandleFirstTokOnLine(Token &Tok);
150
151 /// Move to the line of the provided source location. This will
152 /// return true if the output stream required adjustment or if
153 /// the requested location is on the first line.
154 bool MoveToLine(SourceLocation Loc) {
155 PresumedLoc PLoc = SM.getPresumedLoc(Loc);
156 if (PLoc.isInvalid())
157 return false;
158 return MoveToLine(PLoc.getLine()) || (PLoc.getLine() == 1);
159 }
160 bool MoveToLine(unsigned LineNo);
161
162 bool AvoidConcat(const Token &PrevPrevTok, const Token &PrevTok,
163 const Token &Tok) {
164 return ConcatInfo.AvoidConcat(PrevPrevTok, PrevTok, Tok);
165 }
166 void WriteLineInfo(unsigned LineNo, const char *Extra=nullptr,
167 unsigned ExtraLen=0);
168 bool LineMarkersAreDisabled() const { return DisableLineMarkers; }
169 void HandleNewlinesInToken(const char *TokStr, unsigned Len);
170
171 /// MacroDefined - This hook is called whenever a macro definition is seen.
172 void MacroDefined(const Token &MacroNameTok,
173 const MacroDirective *MD) override;
174
175 /// MacroUndefined - This hook is called whenever a macro #undef is seen.
176 void MacroUndefined(const Token &MacroNameTok,
177 const MacroDefinition &MD,
178 const MacroDirective *Undef) override;
179
180 void BeginModule(const Module *M);
181 void EndModule(const Module *M);
182};
183} // end anonymous namespace
184
185void PrintPPOutputPPCallbacks::WriteLineInfo(unsigned LineNo,
186 const char *Extra,
187 unsigned ExtraLen) {
188 startNewLineIfNeeded(/*ShouldUpdateCurrentLine=*/false);
189
190 // Emit #line directives or GNU line markers depending on what mode we're in.
191 if (UseLineDirectives) {
192 OS << "#line" << ' ' << LineNo << ' ' << '"';
193 OS.write_escaped(CurFilename);
194 OS << '"';
195 } else {
196 OS << '#' << ' ' << LineNo << ' ' << '"';
197 OS.write_escaped(CurFilename);
198 OS << '"';
199
200 if (ExtraLen)
201 OS.write(Extra, ExtraLen);
202
203 if (FileType == SrcMgr::C_System)
204 OS.write(" 3", 2);
205 else if (FileType == SrcMgr::C_ExternCSystem)
206 OS.write(" 3 4", 4);
207 }
208 OS << '\n';
209}
210
211/// MoveToLine - Move the output to the source line specified by the location
212/// object. We can do this by emitting some number of \n's, or be emitting a
213/// #line directive. This returns false if already at the specified line, true
214/// if some newlines were emitted.
215bool PrintPPOutputPPCallbacks::MoveToLine(unsigned LineNo) {
216 // If this line is "close enough" to the original line, just print newlines,
217 // otherwise print a #line directive.
218 if (LineNo-CurLine <= 8) {
219 if (LineNo-CurLine == 1)
220 OS << '\n';
221 else if (LineNo == CurLine)
222 return false; // Spelling line moved, but expansion line didn't.
223 else {
224 const char *NewLines = "\n\n\n\n\n\n\n\n";
225 OS.write(NewLines, LineNo-CurLine);
226 }
227 } else if (!DisableLineMarkers) {
228 // Emit a #line or line marker.
229 WriteLineInfo(LineNo, nullptr, 0);
230 } else {
231 // Okay, we're in -P mode, which turns off line markers. However, we still
232 // need to emit a newline between tokens on different lines.
233 startNewLineIfNeeded(/*ShouldUpdateCurrentLine=*/false);
234 }
235
236 CurLine = LineNo;
237 return true;
238}
239
240bool
241PrintPPOutputPPCallbacks::startNewLineIfNeeded(bool ShouldUpdateCurrentLine) {
242 if (EmittedTokensOnThisLine || EmittedDirectiveOnThisLine) {
243 OS << '\n';
244 EmittedTokensOnThisLine = false;
245 EmittedDirectiveOnThisLine = false;
246 if (ShouldUpdateCurrentLine)
247 ++CurLine;
248 return true;
249 }
250
251 return false;
252}
253
254/// FileChanged - Whenever the preprocessor enters or exits a #include file
255/// it invokes this handler. Update our conception of the current source
256/// position.
257void PrintPPOutputPPCallbacks::FileChanged(SourceLocation Loc,
258 FileChangeReason Reason,
259 SrcMgr::CharacteristicKind NewFileType,
260 FileID PrevFID) {
261 // Unless we are exiting a #include, make sure to skip ahead to the line the
262 // #include directive was at.
263 SourceManager &SourceMgr = SM;
264
265 PresumedLoc UserLoc = SourceMgr.getPresumedLoc(Loc);
266 if (UserLoc.isInvalid())
267 return;
268
269 unsigned NewLine = UserLoc.getLine();
270
271 if (Reason == PPCallbacks::EnterFile) {
272 SourceLocation IncludeLoc = UserLoc.getIncludeLoc();
273 if (IncludeLoc.isValid())
274 MoveToLine(IncludeLoc);
275 } else if (Reason == PPCallbacks::SystemHeaderPragma) {
276 // GCC emits the # directive for this directive on the line AFTER the
277 // directive and emits a bunch of spaces that aren't needed. This is because
278 // otherwise we will emit a line marker for THIS line, which requires an
279 // extra blank line after the directive to avoid making all following lines
280 // off by one. We can do better by simply incrementing NewLine here.
281 NewLine += 1;
282 }
283
284 CurLine = NewLine;
285
286 CurFilename.clear();
287 CurFilename += UserLoc.getFilename();
288 FileType = NewFileType;
289
290 if (DisableLineMarkers) {
291 startNewLineIfNeeded(/*ShouldUpdateCurrentLine=*/false);
292 return;
293 }
294
295 if (!Initialized) {
296 WriteLineInfo(CurLine);
297 Initialized = true;
298 }
299
300 // Do not emit an enter marker for the main file (which we expect is the first
301 // entered file). This matches gcc, and improves compatibility with some tools
302 // which track the # line markers as a way to determine when the preprocessed
303 // output is in the context of the main file.
304 if (Reason == PPCallbacks::EnterFile && !IsFirstFileEntered) {
305 IsFirstFileEntered = true;
306 return;
307 }
308
309 switch (Reason) {
310 case PPCallbacks::EnterFile:
311 WriteLineInfo(CurLine, " 1", 2);
312 break;
313 case PPCallbacks::ExitFile:
314 WriteLineInfo(CurLine, " 2", 2);
315 break;
316 case PPCallbacks::SystemHeaderPragma:
317 case PPCallbacks::RenameFile:
318 WriteLineInfo(CurLine);
319 break;
320 }
321}
322
323void PrintPPOutputPPCallbacks::InclusionDirective(SourceLocation HashLoc,
324 const Token &IncludeTok,
325 StringRef FileName,
326 bool IsAngled,
327 CharSourceRange FilenameRange,
328 const FileEntry *File,
329 StringRef SearchPath,
330 StringRef RelativePath,
331 const Module *Imported) {
332 // In -dI mode, dump #include directives prior to dumping their content or
333 // interpretation.
334 if (DumpIncludeDirectives) {
335 startNewLineIfNeeded();
336 MoveToLine(HashLoc);
337 const std::string TokenText = PP.getSpelling(IncludeTok);
338 assert(!TokenText.empty())(static_cast <bool> (!TokenText.empty()) ? void (0) : __assert_fail
("!TokenText.empty()", "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Frontend/PrintPreprocessedOutput.cpp"
, 338, __extension__ __PRETTY_FUNCTION__))
;
339 OS << "#" << TokenText << " "
340 << (IsAngled ? '<' : '"') << FileName << (IsAngled ? '>' : '"')
341 << " /* clang -E -dI */";
342 setEmittedDirectiveOnThisLine();
343 startNewLineIfNeeded();
344 }
345
346 // When preprocessing, turn implicit imports into module import pragmas.
347 if (Imported) {
348 switch (IncludeTok.getIdentifierInfo()->getPPKeywordID()) {
349 case tok::pp_include:
350 case tok::pp_import:
351 case tok::pp_include_next:
352 startNewLineIfNeeded();
353 MoveToLine(HashLoc);
354 OS << "#pragma clang module import " << Imported->getFullModuleName(true)
355 << " /* clang -E: implicit import for "
356 << "#" << PP.getSpelling(IncludeTok) << " "
357 << (IsAngled ? '<' : '"') << FileName << (IsAngled ? '>' : '"')
358 << " */";
359 // Since we want a newline after the pragma, but not a #<line>, start a
360 // new line immediately.
361 EmittedTokensOnThisLine = true;
362 startNewLineIfNeeded();
363 break;
364
365 case tok::pp___include_macros:
366 // #__include_macros has no effect on a user of a preprocessed source
367 // file; the only effect is on preprocessing.
368 //
369 // FIXME: That's not *quite* true: it causes the module in question to
370 // be loaded, which can affect downstream diagnostics.
371 break;
372
373 default:
374 llvm_unreachable("unknown include directive kind")::llvm::llvm_unreachable_internal("unknown include directive kind"
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Frontend/PrintPreprocessedOutput.cpp"
, 374)
;
375 break;
376 }
377 }
378}
379
380/// Handle entering the scope of a module during a module compilation.
381void PrintPPOutputPPCallbacks::BeginModule(const Module *M) {
382 startNewLineIfNeeded();
383 OS << "#pragma clang module begin " << M->getFullModuleName(true);
384 setEmittedDirectiveOnThisLine();
385}
386
387/// Handle leaving the scope of a module during a module compilation.
388void PrintPPOutputPPCallbacks::EndModule(const Module *M) {
389 startNewLineIfNeeded();
390 OS << "#pragma clang module end /*" << M->getFullModuleName(true) << "*/";
391 setEmittedDirectiveOnThisLine();
392}
393
394/// Ident - Handle #ident directives when read by the preprocessor.
395///
396void PrintPPOutputPPCallbacks::Ident(SourceLocation Loc, StringRef S) {
397 MoveToLine(Loc);
398
399 OS.write("#ident ", strlen("#ident "));
400 OS.write(S.begin(), S.size());
401 EmittedTokensOnThisLine = true;
402}
403
404/// MacroDefined - This hook is called whenever a macro definition is seen.
405void PrintPPOutputPPCallbacks::MacroDefined(const Token &MacroNameTok,
406 const MacroDirective *MD) {
407 const MacroInfo *MI = MD->getMacroInfo();
408 // Only print out macro definitions in -dD mode.
409 if (!DumpDefines ||
410 // Ignore __FILE__ etc.
411 MI->isBuiltinMacro()) return;
412
413 MoveToLine(MI->getDefinitionLoc());
414 PrintMacroDefinition(*MacroNameTok.getIdentifierInfo(), *MI, PP, OS);
415 setEmittedDirectiveOnThisLine();
416}
417
418void PrintPPOutputPPCallbacks::MacroUndefined(const Token &MacroNameTok,
419 const MacroDefinition &MD,
420 const MacroDirective *Undef) {
421 // Only print out macro definitions in -dD mode.
422 if (!DumpDefines) return;
423
424 MoveToLine(MacroNameTok.getLocation());
425 OS << "#undef " << MacroNameTok.getIdentifierInfo()->getName();
426 setEmittedDirectiveOnThisLine();
427}
428
429static void outputPrintable(raw_ostream &OS, StringRef Str) {
430 for (unsigned char Char : Str) {
431 if (isPrintable(Char) && Char != '\\' && Char != '"')
432 OS << (char)Char;
433 else // Output anything hard as an octal escape.
434 OS << '\\'
435 << (char)('0' + ((Char >> 6) & 7))
436 << (char)('0' + ((Char >> 3) & 7))
437 << (char)('0' + ((Char >> 0) & 7));
438 }
439}
440
441void PrintPPOutputPPCallbacks::PragmaMessage(SourceLocation Loc,
442 StringRef Namespace,
443 PragmaMessageKind Kind,
444 StringRef Str) {
445 startNewLineIfNeeded();
446 MoveToLine(Loc);
447 OS << "#pragma ";
448 if (!Namespace.empty())
449 OS << Namespace << ' ';
450 switch (Kind) {
451 case PMK_Message:
452 OS << "message(\"";
453 break;
454 case PMK_Warning:
455 OS << "warning \"";
456 break;
457 case PMK_Error:
458 OS << "error \"";
459 break;
460 }
461
462 outputPrintable(OS, Str);
463 OS << '"';
464 if (Kind == PMK_Message)
465 OS << ')';
466 setEmittedDirectiveOnThisLine();
467}
468
469void PrintPPOutputPPCallbacks::PragmaDebug(SourceLocation Loc,
470 StringRef DebugType) {
471 startNewLineIfNeeded();
472 MoveToLine(Loc);
473
474 OS << "#pragma clang __debug ";
475 OS << DebugType;
476
477 setEmittedDirectiveOnThisLine();
478}
479
480void PrintPPOutputPPCallbacks::
481PragmaDiagnosticPush(SourceLocation Loc, StringRef Namespace) {
482 startNewLineIfNeeded();
483 MoveToLine(Loc);
484 OS << "#pragma " << Namespace << " diagnostic push";
485 setEmittedDirectiveOnThisLine();
486}
487
488void PrintPPOutputPPCallbacks::
489PragmaDiagnosticPop(SourceLocation Loc, StringRef Namespace) {
490 startNewLineIfNeeded();
491 MoveToLine(Loc);
492 OS << "#pragma " << Namespace << " diagnostic pop";
493 setEmittedDirectiveOnThisLine();
494}
495
496void PrintPPOutputPPCallbacks::PragmaDiagnostic(SourceLocation Loc,
497 StringRef Namespace,
498 diag::Severity Map,
499 StringRef Str) {
500 startNewLineIfNeeded();
501 MoveToLine(Loc);
502 OS << "#pragma " << Namespace << " diagnostic ";
503 switch (Map) {
504 case diag::Severity::Remark:
505 OS << "remark";
506 break;
507 case diag::Severity::Warning:
508 OS << "warning";
509 break;
510 case diag::Severity::Error:
511 OS << "error";
512 break;
513 case diag::Severity::Ignored:
514 OS << "ignored";
515 break;
516 case diag::Severity::Fatal:
517 OS << "fatal";
518 break;
519 }
520 OS << " \"" << Str << '"';
521 setEmittedDirectiveOnThisLine();
522}
523
524void PrintPPOutputPPCallbacks::PragmaWarning(SourceLocation Loc,
525 StringRef WarningSpec,
526 ArrayRef<int> Ids) {
527 startNewLineIfNeeded();
528 MoveToLine(Loc);
529 OS << "#pragma warning(" << WarningSpec << ':';
530 for (ArrayRef<int>::iterator I = Ids.begin(), E = Ids.end(); I != E; ++I)
531 OS << ' ' << *I;
532 OS << ')';
533 setEmittedDirectiveOnThisLine();
534}
535
536void PrintPPOutputPPCallbacks::PragmaWarningPush(SourceLocation Loc,
537 int Level) {
538 startNewLineIfNeeded();
539 MoveToLine(Loc);
540 OS << "#pragma warning(push";
541 if (Level >= 0)
542 OS << ", " << Level;
543 OS << ')';
544 setEmittedDirectiveOnThisLine();
545}
546
547void PrintPPOutputPPCallbacks::PragmaWarningPop(SourceLocation Loc) {
548 startNewLineIfNeeded();
549 MoveToLine(Loc);
550 OS << "#pragma warning(pop)";
551 setEmittedDirectiveOnThisLine();
552}
553
554void PrintPPOutputPPCallbacks::
555PragmaAssumeNonNullBegin(SourceLocation Loc) {
556 startNewLineIfNeeded();
557 MoveToLine(Loc);
558 OS << "#pragma clang assume_nonnull begin";
559 setEmittedDirectiveOnThisLine();
560}
561
562void PrintPPOutputPPCallbacks::
563PragmaAssumeNonNullEnd(SourceLocation Loc) {
564 startNewLineIfNeeded();
565 MoveToLine(Loc);
566 OS << "#pragma clang assume_nonnull end";
567 setEmittedDirectiveOnThisLine();
568}
569
570/// HandleFirstTokOnLine - When emitting a preprocessed file in -E mode, this
571/// is called for the first token on each new line. If this really is the start
572/// of a new logical line, handle it and return true, otherwise return false.
573/// This may not be the start of a logical line because the "start of line"
574/// marker is set for spelling lines, not expansion ones.
575bool PrintPPOutputPPCallbacks::HandleFirstTokOnLine(Token &Tok) {
576 // Figure out what line we went to and insert the appropriate number of
577 // newline characters.
578 if (!MoveToLine(Tok.getLocation()))
579 return false;
580
581 // Print out space characters so that the first token on a line is
582 // indented for easy reading.
583 unsigned ColNo = SM.getExpansionColumnNumber(Tok.getLocation());
584
585 // The first token on a line can have a column number of 1, yet still expect
586 // leading white space, if a macro expansion in column 1 starts with an empty
587 // macro argument, or an empty nested macro expansion. In this case, move the
588 // token to column 2.
589 if (ColNo == 1 && Tok.hasLeadingSpace())
590 ColNo = 2;
591
592 // This hack prevents stuff like:
593 // #define HASH #
594 // HASH define foo bar
595 // From having the # character end up at column 1, which makes it so it
596 // is not handled as a #define next time through the preprocessor if in
597 // -fpreprocessed mode.
598 if (ColNo <= 1 && Tok.is(tok::hash))
599 OS << ' ';
600
601 // Otherwise, indent the appropriate number of spaces.
602 for (; ColNo > 1; --ColNo)
603 OS << ' ';
604
605 return true;
606}
607
608void PrintPPOutputPPCallbacks::HandleNewlinesInToken(const char *TokStr,
609 unsigned Len) {
610 unsigned NumNewlines = 0;
611 for (; Len; --Len, ++TokStr) {
612 if (*TokStr != '\n' &&
613 *TokStr != '\r')
614 continue;
615
616 ++NumNewlines;
617
618 // If we have \n\r or \r\n, skip both and count as one line.
619 if (Len != 1 &&
620 (TokStr[1] == '\n' || TokStr[1] == '\r') &&
621 TokStr[0] != TokStr[1]) {
622 ++TokStr;
623 --Len;
624 }
625 }
626
627 if (NumNewlines == 0) return;
628
629 CurLine += NumNewlines;
630}
631
632
633namespace {
634struct UnknownPragmaHandler : public PragmaHandler {
635 const char *Prefix;
636 PrintPPOutputPPCallbacks *Callbacks;
637
638 // Set to true if tokens should be expanded
639 bool ShouldExpandTokens;
640
641 UnknownPragmaHandler(const char *prefix, PrintPPOutputPPCallbacks *callbacks,
642 bool RequireTokenExpansion)
643 : Prefix(prefix), Callbacks(callbacks),
644 ShouldExpandTokens(RequireTokenExpansion) {}
645 void HandlePragma(Preprocessor &PP, PragmaIntroducerKind Introducer,
646 Token &PragmaTok) override {
647 // Figure out what line we went to and insert the appropriate number of
648 // newline characters.
649 Callbacks->startNewLineIfNeeded();
650 Callbacks->MoveToLine(PragmaTok.getLocation());
651 Callbacks->OS.write(Prefix, strlen(Prefix));
652
653 if (ShouldExpandTokens) {
654 // The first token does not have expanded macros. Expand them, if
655 // required.
656 auto Toks = llvm::make_unique<Token[]>(1);
657 Toks[0] = PragmaTok;
658 PP.EnterTokenStream(std::move(Toks), /*NumToks=*/1,
659 /*DisableMacroExpansion=*/false);
660 PP.Lex(PragmaTok);
661 }
662 Token PrevToken;
663 Token PrevPrevToken;
664 PrevToken.startToken();
665 PrevPrevToken.startToken();
666
667 // Read and print all of the pragma tokens.
668 while (PragmaTok.isNot(tok::eod)) {
669 if (PragmaTok.hasLeadingSpace() ||
670 Callbacks->AvoidConcat(PrevPrevToken, PrevToken, PragmaTok))
671 Callbacks->OS << ' ';
672 std::string TokSpell = PP.getSpelling(PragmaTok);
673 Callbacks->OS.write(&TokSpell[0], TokSpell.size());
674
675 PrevPrevToken = PrevToken;
676 PrevToken = PragmaTok;
677
678 if (ShouldExpandTokens)
679 PP.Lex(PragmaTok);
680 else
681 PP.LexUnexpandedToken(PragmaTok);
682 }
683 Callbacks->setEmittedDirectiveOnThisLine();
684 }
685};
686} // end anonymous namespace
687
688
689static void PrintPreprocessedTokens(Preprocessor &PP, Token &Tok,
690 PrintPPOutputPPCallbacks *Callbacks,
691 raw_ostream &OS) {
692 bool DropComments = PP.getLangOpts().TraditionalCPP &&
693 !PP.getCommentRetentionState();
694
695 char Buffer[256];
696 Token PrevPrevTok, PrevTok;
697 PrevPrevTok.startToken();
698 PrevTok.startToken();
699 while (1) {
700 if (Callbacks->hasEmittedDirectiveOnThisLine()) {
701 Callbacks->startNewLineIfNeeded();
702 Callbacks->MoveToLine(Tok.getLocation());
703 }
704
705 // If this token is at the start of a line, emit newlines if needed.
706 if (Tok.isAtStartOfLine() && Callbacks->HandleFirstTokOnLine(Tok)) {
707 // done.
708 } else if (Tok.hasLeadingSpace() ||
709 // If we haven't emitted a token on this line yet, PrevTok isn't
710 // useful to look at and no concatenation could happen anyway.
711 (Callbacks->hasEmittedTokensOnThisLine() &&
712 // Don't print "-" next to "-", it would form "--".
713 Callbacks->AvoidConcat(PrevPrevTok, PrevTok, Tok))) {
714 OS << ' ';
715 }
716
717 if (DropComments && Tok.is(tok::comment)) {
718 // Skip comments. Normally the preprocessor does not generate
719 // tok::comment nodes at all when not keeping comments, but under
720 // -traditional-cpp the lexer keeps /all/ whitespace, including comments.
721 SourceLocation StartLoc = Tok.getLocation();
722 Callbacks->MoveToLine(StartLoc.getLocWithOffset(Tok.getLength()));
723 } else if (Tok.is(tok::eod)) {
724 // Don't print end of directive tokens, since they are typically newlines
725 // that mess up our line tracking. These come from unknown pre-processor
726 // directives or hash-prefixed comments in standalone assembly files.
727 PP.Lex(Tok);
728 continue;
729 } else if (Tok.is(tok::annot_module_include)) {
730 // PrintPPOutputPPCallbacks::InclusionDirective handles producing
731 // appropriate output here. Ignore this token entirely.
732 PP.Lex(Tok);
733 continue;
734 } else if (Tok.is(tok::annot_module_begin)) {
735 // FIXME: We retrieve this token after the FileChanged callback, and
736 // retrieve the module_end token before the FileChanged callback, so
737 // we render this within the file and render the module end outside the
738 // file, but this is backwards from the token locations: the module_begin
739 // token is at the include location (outside the file) and the module_end
740 // token is at the EOF location (within the file).
741 Callbacks->BeginModule(
742 reinterpret_cast<Module *>(Tok.getAnnotationValue()));
743 PP.Lex(Tok);
744 continue;
745 } else if (Tok.is(tok::annot_module_end)) {
746 Callbacks->EndModule(
747 reinterpret_cast<Module *>(Tok.getAnnotationValue()));
748 PP.Lex(Tok);
749 continue;
750 } else if (IdentifierInfo *II = Tok.getIdentifierInfo()) {
751 OS << II->getName();
752 } else if (Tok.isLiteral() && !Tok.needsCleaning() &&
753 Tok.getLiteralData()) {
754 OS.write(Tok.getLiteralData(), Tok.getLength());
755 } else if (Tok.getLength() < llvm::array_lengthof(Buffer)) {
756 const char *TokPtr = Buffer;
757 unsigned Len = PP.getSpelling(Tok, TokPtr);
758 OS.write(TokPtr, Len);
759
760 // Tokens that can contain embedded newlines need to adjust our current
761 // line number.
762 if (Tok.getKind() == tok::comment || Tok.getKind() == tok::unknown)
763 Callbacks->HandleNewlinesInToken(TokPtr, Len);
764 } else {
765 std::string S = PP.getSpelling(Tok);
766 OS.write(&S[0], S.size());
767
768 // Tokens that can contain embedded newlines need to adjust our current
769 // line number.
770 if (Tok.getKind() == tok::comment || Tok.getKind() == tok::unknown)
771 Callbacks->HandleNewlinesInToken(&S[0], S.size());
772 }
773 Callbacks->setEmittedTokensOnThisLine();
774
775 if (Tok.is(tok::eof)) break;
776
777 PrevPrevTok = PrevTok;
778 PrevTok = Tok;
779 PP.Lex(Tok);
780 }
781}
782
783typedef std::pair<const IdentifierInfo *, MacroInfo *> id_macro_pair;
784static int MacroIDCompare(const id_macro_pair *LHS, const id_macro_pair *RHS) {
785 return LHS->first->getName().compare(RHS->first->getName());
786}
787
788static void DoPrintMacros(Preprocessor &PP, raw_ostream *OS) {
789 // Ignore unknown pragmas.
790 PP.IgnorePragmas();
791
792 // -dM mode just scans and ignores all tokens in the files, then dumps out
793 // the macro table at the end.
794 PP.EnterMainSourceFile();
795
796 Token Tok;
797 do PP.Lex(Tok);
798 while (Tok.isNot(tok::eof));
799
800 SmallVector<id_macro_pair, 128> MacrosByID;
801 for (Preprocessor::macro_iterator I = PP.macro_begin(), E = PP.macro_end();
802 I != E; ++I) {
803 auto *MD = I->second.getLatest();
804 if (MD && MD->isDefined())
805 MacrosByID.push_back(id_macro_pair(I->first, MD->getMacroInfo()));
806 }
807 llvm::array_pod_sort(MacrosByID.begin(), MacrosByID.end(), MacroIDCompare);
808
809 for (unsigned i = 0, e = MacrosByID.size(); i != e; ++i) {
810 MacroInfo &MI = *MacrosByID[i].second;
811 // Ignore computed macros like __LINE__ and friends.
812 if (MI.isBuiltinMacro()) continue;
813
814 PrintMacroDefinition(*MacrosByID[i].first, MI, PP, *OS);
815 *OS << '\n';
816 }
817}
818
819/// DoPrintPreprocessedInput - This implements -E mode.
820///
821void clang::DoPrintPreprocessedInput(Preprocessor &PP, raw_ostream *OS,
822 const PreprocessorOutputOptions &Opts) {
823 // Show macros with no output is handled specially.
824 if (!Opts.ShowCPP) {
1
Assuming the condition is false
2
Taking false branch
825 assert(Opts.ShowMacros && "Not yet implemented!")(static_cast <bool> (Opts.ShowMacros && "Not yet implemented!"
) ? void (0) : __assert_fail ("Opts.ShowMacros && \"Not yet implemented!\""
, "/build/llvm-toolchain-snapshot-7~svn329677/tools/clang/lib/Frontend/PrintPreprocessedOutput.cpp"
, 825, __extension__ __PRETTY_FUNCTION__))
;
826 DoPrintMacros(PP, OS);
827 return;
828 }
829
830 // Inform the preprocessor whether we want it to retain comments or not, due
831 // to -C or -CC.
832 PP.SetCommentRetentionState(Opts.ShowComments, Opts.ShowMacroComments);
833
834 PrintPPOutputPPCallbacks *Callbacks = new PrintPPOutputPPCallbacks(
3
Memory is allocated
835 PP, *OS, !Opts.ShowLineMarkers, Opts.ShowMacros,
4
Assuming the condition is false
836 Opts.ShowIncludeDirectives, Opts.UseLineDirectives);
837
838 // Expand macros in pragmas with -fms-extensions. The assumption is that
839 // the majority of pragmas in such a file will be Microsoft pragmas.
840 // Remember the handlers we will add so that we can remove them later.
841 std::unique_ptr<UnknownPragmaHandler> MicrosoftExtHandler(
842 new UnknownPragmaHandler(
843 "#pragma", Callbacks,
844 /*RequireTokenExpansion=*/PP.getLangOpts().MicrosoftExt));
845
846 std::unique_ptr<UnknownPragmaHandler> GCCHandler(new UnknownPragmaHandler(
847 "#pragma GCC", Callbacks,
848 /*RequireTokenExpansion=*/PP.getLangOpts().MicrosoftExt));
849
850 std::unique_ptr<UnknownPragmaHandler> ClangHandler(new UnknownPragmaHandler(
851 "#pragma clang", Callbacks,
852 /*RequireTokenExpansion=*/PP.getLangOpts().MicrosoftExt));
853
854 PP.AddPragmaHandler(MicrosoftExtHandler.get());
855 PP.AddPragmaHandler("GCC", GCCHandler.get());
856 PP.AddPragmaHandler("clang", ClangHandler.get());
857
858 // The tokens after pragma omp need to be expanded.
859 //
860 // OpenMP [2.1, Directive format]
861 // Preprocessing tokens following the #pragma omp are subject to macro
862 // replacement.
863 std::unique_ptr<UnknownPragmaHandler> OpenMPHandler(
864 new UnknownPragmaHandler("#pragma omp", Callbacks,
865 /*RequireTokenExpansion=*/true));
866 PP.AddPragmaHandler("omp", OpenMPHandler.get());
867
868 PP.addPPCallbacks(std::unique_ptr<PPCallbacks>(Callbacks));
5
Calling '~unique_ptr'
10
Returning from '~unique_ptr'
869
870 // After we have configured the preprocessor, enter the main file.
871 PP.EnterMainSourceFile();
872
873 // Consume all of the tokens that come from the predefines buffer. Those
874 // should not be emitted into the output and are guaranteed to be at the
875 // start.
876 const SourceManager &SourceMgr = PP.getSourceManager();
877 Token Tok;
878 do {
879 PP.Lex(Tok);
880 if (Tok.is(tok::eof) || !Tok.getLocation().isFileID())
11
Taking true branch
881 break;
12
Execution continues on line 892
882
883 PresumedLoc PLoc = SourceMgr.getPresumedLoc(Tok.getLocation());
884 if (PLoc.isInvalid())
885 break;
886
887 if (strcmp(PLoc.getFilename(), "<built-in>"))
888 break;
889 } while (true);
890
891 // Read all the preprocessed tokens, printing them out to the stream.
892 PrintPreprocessedTokens(PP, Tok, Callbacks, *OS);
13
Use of memory after it is freed
893 *OS << '\n';
894
895 // Remove the handlers we just added to leave the preprocessor in a sane state
896 // so that it can be reused (for example by a clang::Parser instance).
897 PP.RemovePragmaHandler(MicrosoftExtHandler.get());
898 PP.RemovePragmaHandler("GCC", GCCHandler.get());
899 PP.RemovePragmaHandler("clang", ClangHandler.get());
900 PP.RemovePragmaHandler("omp", OpenMPHandler.get());
901}

/usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/c++/7.3.0/bits/unique_ptr.h

1// unique_ptr implementation -*- C++ -*-
2
3// Copyright (C) 2008-2017 Free Software Foundation, Inc.
4//
5// This file is part of the GNU ISO C++ Library. This library is free
6// software; you can redistribute it and/or modify it under the
7// terms of the GNU General Public License as published by the
8// Free Software Foundation; either version 3, or (at your option)
9// any later version.
10
11// This library is distributed in the hope that it will be useful,
12// but WITHOUT ANY WARRANTY; without even the implied warranty of
13// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14// GNU General Public License for more details.
15
16// Under Section 7 of GPL version 3, you are granted additional
17// permissions described in the GCC Runtime Library Exception, version
18// 3.1, as published by the Free Software Foundation.
19
20// You should have received a copy of the GNU General Public License and
21// a copy of the GCC Runtime Library Exception along with this program;
22// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23// <http://www.gnu.org/licenses/>.
24
25/** @file bits/unique_ptr.h
26 * This is an internal header file, included by other library headers.
27 * Do not attempt to use it directly. @headername{memory}
28 */
29
30#ifndef _UNIQUE_PTR_H1
31#define _UNIQUE_PTR_H1 1
32
33#include <bits/c++config.h>
34#include <debug/assertions.h>
35#include <type_traits>
36#include <utility>
37#include <tuple>
38#include <bits/stl_function.h>
39#include <bits/functional_hash.h>
40
41namespace std _GLIBCXX_VISIBILITY(default)__attribute__ ((__visibility__ ("default")))
42{
43_GLIBCXX_BEGIN_NAMESPACE_VERSION
44
45 /**
46 * @addtogroup pointer_abstractions
47 * @{
48 */
49
50#if _GLIBCXX_USE_DEPRECATED1
51 template<typename> class auto_ptr;
52#endif
53
54 /// Primary template of default_delete, used by unique_ptr
55 template<typename _Tp>
56 struct default_delete
57 {
58 /// Default constructor
59 constexpr default_delete() noexcept = default;
60
61 /** @brief Converting constructor.
62 *
63 * Allows conversion from a deleter for arrays of another type, @p _Up,
64 * only if @p _Up* is convertible to @p _Tp*.
65 */
66 template<typename _Up, typename = typename
67 enable_if<is_convertible<_Up*, _Tp*>::value>::type>
68 default_delete(const default_delete<_Up>&) noexcept { }
69
70 /// Calls @c delete @p __ptr
71 void
72 operator()(_Tp* __ptr) const
73 {
74 static_assert(!is_void<_Tp>::value,
75 "can't delete pointer to incomplete type");
76 static_assert(sizeof(_Tp)>0,
77 "can't delete pointer to incomplete type");
78 delete __ptr;
8
Memory is released
79 }
80 };
81
82 // _GLIBCXX_RESOLVE_LIB_DEFECTS
83 // DR 740 - omit specialization for array objects with a compile time length
84 /// Specialization for arrays, default_delete.
85 template<typename _Tp>
86 struct default_delete<_Tp[]>
87 {
88 public:
89 /// Default constructor
90 constexpr default_delete() noexcept = default;
91
92 /** @brief Converting constructor.
93 *
94 * Allows conversion from a deleter for arrays of another type, such as
95 * a const-qualified version of @p _Tp.
96 *
97 * Conversions from types derived from @c _Tp are not allowed because
98 * it is unsafe to @c delete[] an array of derived types through a
99 * pointer to the base type.
100 */
101 template<typename _Up, typename = typename
102 enable_if<is_convertible<_Up(*)[], _Tp(*)[]>::value>::type>
103 default_delete(const default_delete<_Up[]>&) noexcept { }
104
105 /// Calls @c delete[] @p __ptr
106 template<typename _Up>
107 typename enable_if<is_convertible<_Up(*)[], _Tp(*)[]>::value>::type
108 operator()(_Up* __ptr) const
109 {
110 static_assert(sizeof(_Tp)>0,
111 "can't delete pointer to incomplete type");
112 delete [] __ptr;
113 }
114 };
115
116 template <typename _Tp, typename _Dp>
117 class __uniq_ptr_impl
118 {
119 template <typename _Up, typename _Ep, typename = void>
120 struct _Ptr
121 {
122 using type = _Up*;
123 };
124
125 template <typename _Up, typename _Ep>
126 struct
127 _Ptr<_Up, _Ep, __void_t<typename remove_reference<_Ep>::type::pointer>>
128 {
129 using type = typename remove_reference<_Ep>::type::pointer;
130 };
131
132 public:
133 using _DeleterConstraint = enable_if<
134 __and_<__not_<is_pointer<_Dp>>,
135 is_default_constructible<_Dp>>::value>;
136
137 using pointer = typename _Ptr<_Tp, _Dp>::type;
138
139 __uniq_ptr_impl() = default;
140 __uniq_ptr_impl(pointer __p) : _M_t() { _M_ptr() = __p; }
141
142 template<typename _Del>
143 __uniq_ptr_impl(pointer __p, _Del&& __d)
144 : _M_t(__p, std::forward<_Del>(__d)) { }
145
146 pointer& _M_ptr() { return std::get<0>(_M_t); }
147 pointer _M_ptr() const { return std::get<0>(_M_t); }
148 _Dp& _M_deleter() { return std::get<1>(_M_t); }
149 const _Dp& _M_deleter() const { return std::get<1>(_M_t); }
150
151 private:
152 tuple<pointer, _Dp> _M_t;
153 };
154
155 /// 20.7.1.2 unique_ptr for single objects.
156 template <typename _Tp, typename _Dp = default_delete<_Tp>>
157 class unique_ptr
158 {
159 template <class _Up>
160 using _DeleterConstraint =
161 typename __uniq_ptr_impl<_Tp, _Up>::_DeleterConstraint::type;
162
163 __uniq_ptr_impl<_Tp, _Dp> _M_t;
164
165 public:
166 using pointer = typename __uniq_ptr_impl<_Tp, _Dp>::pointer;
167 using element_type = _Tp;
168 using deleter_type = _Dp;
169
170 // helper template for detecting a safe conversion from another
171 // unique_ptr
172 template<typename _Up, typename _Ep>
173 using __safe_conversion_up = __and_<
174 is_convertible<typename unique_ptr<_Up, _Ep>::pointer, pointer>,
175 __not_<is_array<_Up>>,
176 __or_<__and_<is_reference<deleter_type>,
177 is_same<deleter_type, _Ep>>,
178 __and_<__not_<is_reference<deleter_type>>,
179 is_convertible<_Ep, deleter_type>>
180 >
181 >;
182
183 // Constructors.
184
185 /// Default constructor, creates a unique_ptr that owns nothing.
186 template <typename _Up = _Dp,
187 typename = _DeleterConstraint<_Up>>
188 constexpr unique_ptr() noexcept
189 : _M_t()
190 { }
191
192 /** Takes ownership of a pointer.
193 *
194 * @param __p A pointer to an object of @c element_type
195 *
196 * The deleter will be value-initialized.
197 */
198 template <typename _Up = _Dp,
199 typename = _DeleterConstraint<_Up>>
200 explicit
201 unique_ptr(pointer __p) noexcept
202 : _M_t(__p)
203 { }
204
205 /** Takes ownership of a pointer.
206 *
207 * @param __p A pointer to an object of @c element_type
208 * @param __d A reference to a deleter.
209 *
210 * The deleter will be initialized with @p __d
211 */
212 unique_ptr(pointer __p,
213 typename conditional<is_reference<deleter_type>::value,
214 deleter_type, const deleter_type&>::type __d) noexcept
215 : _M_t(__p, __d) { }
216
217 /** Takes ownership of a pointer.
218 *
219 * @param __p A pointer to an object of @c element_type
220 * @param __d An rvalue reference to a deleter.
221 *
222 * The deleter will be initialized with @p std::move(__d)
223 */
224 unique_ptr(pointer __p,
225 typename remove_reference<deleter_type>::type&& __d) noexcept
226 : _M_t(std::move(__p), std::move(__d))
227 { static_assert(!std::is_reference<deleter_type>::value,
228 "rvalue deleter bound to reference"); }
229
230 /// Creates a unique_ptr that owns nothing.
231 template <typename _Up = _Dp,
232 typename = _DeleterConstraint<_Up>>
233 constexpr unique_ptr(nullptr_t) noexcept : unique_ptr() { }
234
235 // Move constructors.
236
237 /// Move constructor.
238 unique_ptr(unique_ptr&& __u) noexcept
239 : _M_t(__u.release(), std::forward<deleter_type>(__u.get_deleter())) { }
240
241 /** @brief Converting constructor from another type
242 *
243 * Requires that the pointer owned by @p __u is convertible to the
244 * type of pointer owned by this object, @p __u does not own an array,
245 * and @p __u has a compatible deleter type.
246 */
247 template<typename _Up, typename _Ep, typename = _Require<
248 __safe_conversion_up<_Up, _Ep>,
249 typename conditional<is_reference<_Dp>::value,
250 is_same<_Ep, _Dp>,
251 is_convertible<_Ep, _Dp>>::type>>
252 unique_ptr(unique_ptr<_Up, _Ep>&& __u) noexcept
253 : _M_t(__u.release(), std::forward<_Ep>(__u.get_deleter()))
254 { }
255
256#if _GLIBCXX_USE_DEPRECATED1
257 /// Converting constructor from @c auto_ptr
258 template<typename _Up, typename = _Require<
259 is_convertible<_Up*, _Tp*>, is_same<_Dp, default_delete<_Tp>>>>
260 unique_ptr(auto_ptr<_Up>&& __u) noexcept;
261#endif
262
263 /// Destructor, invokes the deleter if the stored pointer is not null.
264 ~unique_ptr() noexcept
265 {
266 auto& __ptr = _M_t._M_ptr();
267 if (__ptr != nullptr)
6
Taking true branch
268 get_deleter()(__ptr);
7
Calling 'default_delete::operator()'
9
Returning; memory was released via 2nd parameter
269 __ptr = pointer();
270 }
271
272 // Assignment.
273
274 /** @brief Move assignment operator.
275 *
276 * @param __u The object to transfer ownership from.
277 *
278 * Invokes the deleter first if this object owns a pointer.
279 */
280 unique_ptr&
281 operator=(unique_ptr&& __u) noexcept
282 {
283 reset(__u.release());
284 get_deleter() = std::forward<deleter_type>(__u.get_deleter());
285 return *this;
286 }
287
288 /** @brief Assignment from another type.
289 *
290 * @param __u The object to transfer ownership from, which owns a
291 * convertible pointer to a non-array object.
292 *
293 * Invokes the deleter first if this object owns a pointer.
294 */
295 template<typename _Up, typename _Ep>
296 typename enable_if< __and_<
297 __safe_conversion_up<_Up, _Ep>,
298 is_assignable<deleter_type&, _Ep&&>
299 >::value,
300 unique_ptr&>::type
301 operator=(unique_ptr<_Up, _Ep>&& __u) noexcept
302 {
303 reset(__u.release());
304 get_deleter() = std::forward<_Ep>(__u.get_deleter());
305 return *this;
306 }
307
308 /// Reset the %unique_ptr to empty, invoking the deleter if necessary.
309 unique_ptr&
310 operator=(nullptr_t) noexcept
311 {
312 reset();
313 return *this;
314 }
315
316 // Observers.
317
318 /// Dereference the stored pointer.
319 typename add_lvalue_reference<element_type>::type
320 operator*() const
321 {
322 __glibcxx_assert(get() != pointer());
323 return *get();
324 }
325
326 /// Return the stored pointer.
327 pointer
328 operator->() const noexcept
329 {
330 _GLIBCXX_DEBUG_PEDASSERT(get() != pointer());
331 return get();
332 }
333
334 /// Return the stored pointer.
335 pointer
336 get() const noexcept
337 { return _M_t._M_ptr(); }
338
339 /// Return a reference to the stored deleter.
340 deleter_type&
341 get_deleter() noexcept
342 { return _M_t._M_deleter(); }
343
344 /// Return a reference to the stored deleter.
345 const deleter_type&
346 get_deleter() const noexcept
347 { return _M_t._M_deleter(); }
348
349 /// Return @c true if the stored pointer is not null.
350 explicit operator bool() const noexcept
351 { return get() == pointer() ? false : true; }
352
353 // Modifiers.
354
355 /// Release ownership of any stored pointer.
356 pointer
357 release() noexcept
358 {
359 pointer __p = get();
360 _M_t._M_ptr() = pointer();
361 return __p;
362 }
363
364 /** @brief Replace the stored pointer.
365 *
366 * @param __p The new pointer to store.
367 *
368 * The deleter will be invoked if a pointer is already owned.
369 */
370 void
371 reset(pointer __p = pointer()) noexcept
372 {
373 using std::swap;
374 swap(_M_t._M_ptr(), __p);
375 if (__p != pointer())
376 get_deleter()(__p);
377 }
378
379 /// Exchange the pointer and deleter with another object.
380 void
381 swap(unique_ptr& __u) noexcept
382 {
383 using std::swap;
384 swap(_M_t, __u._M_t);
385 }
386
387 // Disable copy from lvalue.
388 unique_ptr(const unique_ptr&) = delete;
389 unique_ptr& operator=(const unique_ptr&) = delete;
390 };
391
392 /// 20.7.1.3 unique_ptr for array objects with a runtime length
393 // [unique.ptr.runtime]
394 // _GLIBCXX_RESOLVE_LIB_DEFECTS
395 // DR 740 - omit specialization for array objects with a compile time length
396 template<typename _Tp, typename _Dp>
397 class unique_ptr<_Tp[], _Dp>
398 {
399 template <typename _Up>
400 using _DeleterConstraint =
401 typename __uniq_ptr_impl<_Tp, _Up>::_DeleterConstraint::type;
402
403 __uniq_ptr_impl<_Tp, _Dp> _M_t;
404
405 template<typename _Up>
406 using __remove_cv = typename remove_cv<_Up>::type;
407
408 // like is_base_of<_Tp, _Up> but false if unqualified types are the same
409 template<typename _Up>
410 using __is_derived_Tp
411 = __and_< is_base_of<_Tp, _Up>,
412 __not_<is_same<__remove_cv<_Tp>, __remove_cv<_Up>>> >;
413
414 public:
415 using pointer = typename __uniq_ptr_impl<_Tp, _Dp>::pointer;
416 using element_type = _Tp;
417 using deleter_type = _Dp;
418
419 // helper template for detecting a safe conversion from another
420 // unique_ptr
421 template<typename _Up, typename _Ep,
422 typename _Up_up = unique_ptr<_Up, _Ep>,
423 typename _Up_element_type = typename _Up_up::element_type>
424 using __safe_conversion_up = __and_<
425 is_array<_Up>,
426 is_same<pointer, element_type*>,
427 is_same<typename _Up_up::pointer, _Up_element_type*>,
428 is_convertible<_Up_element_type(*)[], element_type(*)[]>,
429 __or_<__and_<is_reference<deleter_type>, is_same<deleter_type, _Ep>>,
430 __and_<__not_<is_reference<deleter_type>>,
431 is_convertible<_Ep, deleter_type>>>
432 >;
433
434 // helper template for detecting a safe conversion from a raw pointer
435 template<typename _Up>
436 using __safe_conversion_raw = __and_<
437 __or_<__or_<is_same<_Up, pointer>,
438 is_same<_Up, nullptr_t>>,
439 __and_<is_pointer<_Up>,
440 is_same<pointer, element_type*>,
441 is_convertible<
442 typename remove_pointer<_Up>::type(*)[],
443 element_type(*)[]>
444 >
445 >
446 >;
447
448 // Constructors.
449
450 /// Default constructor, creates a unique_ptr that owns nothing.
451 template <typename _Up = _Dp,
452 typename = _DeleterConstraint<_Up>>
453 constexpr unique_ptr() noexcept
454 : _M_t()
455 { }
456
457 /** Takes ownership of a pointer.
458 *
459 * @param __p A pointer to an array of a type safely convertible
460 * to an array of @c element_type
461 *
462 * The deleter will be value-initialized.
463 */
464 template<typename _Up,
465 typename _Vp = _Dp,
466 typename = _DeleterConstraint<_Vp>,
467 typename = typename enable_if<
468 __safe_conversion_raw<_Up>::value, bool>::type>
469 explicit
470 unique_ptr(_Up __p) noexcept
471 : _M_t(__p)
472 { }
473
474 /** Takes ownership of a pointer.
475 *
476 * @param __p A pointer to an array of a type safely convertible
477 * to an array of @c element_type
478 * @param __d A reference to a deleter.
479 *
480 * The deleter will be initialized with @p __d
481 */
482 template<typename _Up,
483 typename = typename enable_if<
484 __safe_conversion_raw<_Up>::value, bool>::type>
485 unique_ptr(_Up __p,
486 typename conditional<is_reference<deleter_type>::value,
487 deleter_type, const deleter_type&>::type __d) noexcept
488 : _M_t(__p, __d) { }
489
490 /** Takes ownership of a pointer.
491 *
492 * @param __p A pointer to an array of a type safely convertible
493 * to an array of @c element_type
494 * @param __d A reference to a deleter.
495 *
496 * The deleter will be initialized with @p std::move(__d)
497 */
498 template<typename _Up,
499 typename = typename enable_if<
500 __safe_conversion_raw<_Up>::value, bool>::type>
501 unique_ptr(_Up __p, typename
502 remove_reference<deleter_type>::type&& __d) noexcept
503 : _M_t(std::move(__p), std::move(__d))
504 { static_assert(!is_reference<deleter_type>::value,
505 "rvalue deleter bound to reference"); }
506
507 /// Move constructor.
508 unique_ptr(unique_ptr&& __u) noexcept
509 : _M_t(__u.release(), std::forward<deleter_type>(__u.get_deleter())) { }
510
511 /// Creates a unique_ptr that owns nothing.
512 template <typename _Up = _Dp,
513 typename = _DeleterConstraint<_Up>>
514 constexpr unique_ptr(nullptr_t) noexcept : unique_ptr() { }
515
516 template<typename _Up, typename _Ep,
517 typename = _Require<__safe_conversion_up<_Up, _Ep>>>
518 unique_ptr(unique_ptr<_Up, _Ep>&& __u) noexcept
519 : _M_t(__u.release(), std::forward<_Ep>(__u.get_deleter()))
520 { }
521
522 /// Destructor, invokes the deleter if the stored pointer is not null.
523 ~unique_ptr()
524 {
525 auto& __ptr = _M_t._M_ptr();
526 if (__ptr != nullptr)
527 get_deleter()(__ptr);
528 __ptr = pointer();
529 }
530
531 // Assignment.
532
533 /** @brief Move assignment operator.
534 *
535 * @param __u The object to transfer ownership from.
536 *
537 * Invokes the deleter first if this object owns a pointer.
538 */
539 unique_ptr&
540 operator=(unique_ptr&& __u) noexcept
541 {
542 reset(__u.release());
543 get_deleter() = std::forward<deleter_type>(__u.get_deleter());
544 return *this;
545 }
546
547 /** @brief Assignment from another type.
548 *
549 * @param __u The object to transfer ownership from, which owns a
550 * convertible pointer to an array object.
551 *
552 * Invokes the deleter first if this object owns a pointer.
553 */
554 template<typename _Up, typename _Ep>
555 typename
556 enable_if<__and_<__safe_conversion_up<_Up, _Ep>,
557 is_assignable<deleter_type&, _Ep&&>
558 >::value,
559 unique_ptr&>::type
560 operator=(unique_ptr<_Up, _Ep>&& __u) noexcept
561 {
562 reset(__u.release());
563 get_deleter() = std::forward<_Ep>(__u.get_deleter());
564 return *this;
565 }
566
567 /// Reset the %unique_ptr to empty, invoking the deleter if necessary.
568 unique_ptr&
569 operator=(nullptr_t) noexcept
570 {
571 reset();
572 return *this;
573 }
574
575 // Observers.
576
577 /// Access an element of owned array.
578 typename std::add_lvalue_reference<element_type>::type
579 operator[](size_t __i) const
580 {
581 __glibcxx_assert(get() != pointer());
582 return get()[__i];
583 }
584
585 /// Return the stored pointer.
586 pointer
587 get() const noexcept
588 { return _M_t._M_ptr(); }
589
590 /// Return a reference to the stored deleter.
591 deleter_type&
592 get_deleter() noexcept
593 { return _M_t._M_deleter(); }
594
595 /// Return a reference to the stored deleter.
596 const deleter_type&
597 get_deleter() const noexcept
598 { return _M_t._M_deleter(); }
599
600 /// Return @c true if the stored pointer is not null.
601 explicit operator bool() const noexcept
602 { return get() == pointer() ? false : true; }
603
604 // Modifiers.
605
606 /// Release ownership of any stored pointer.
607 pointer
608 release() noexcept
609 {
610 pointer __p = get();
611 _M_t._M_ptr() = pointer();
612 return __p;
613 }
614
615 /** @brief Replace the stored pointer.
616 *
617 * @param __p The new pointer to store.
618 *
619 * The deleter will be invoked if a pointer is already owned.
620 */
621 template <typename _Up,
622 typename = _Require<
623 __or_<is_same<_Up, pointer>,
624 __and_<is_same<pointer, element_type*>,
625 is_pointer<_Up>,
626 is_convertible<
627 typename remove_pointer<_Up>::type(*)[],
628 element_type(*)[]
629 >
630 >
631 >
632 >>
633 void
634 reset(_Up __p) noexcept
635 {
636 pointer __ptr = __p;
637 using std::swap;
638 swap(_M_t._M_ptr(), __ptr);
639 if (__ptr != nullptr)
640 get_deleter()(__ptr);
641 }
642
643 void reset(nullptr_t = nullptr) noexcept
644 {
645 reset(pointer());
646 }
647
648 /// Exchange the pointer and deleter with another object.
649 void
650 swap(unique_ptr& __u) noexcept
651 {
652 using std::swap;
653 swap(_M_t, __u._M_t);
654 }
655
656 // Disable copy from lvalue.
657 unique_ptr(const unique_ptr&) = delete;
658 unique_ptr& operator=(const unique_ptr&) = delete;
659 };
660
661 template<typename _Tp, typename _Dp>
662 inline
663#if __cplusplus201103L > 201402L || !defined(__STRICT_ANSI__1) // c++1z or gnu++11
664 // Constrained free swap overload, see p0185r1
665 typename enable_if<__is_swappable<_Dp>::value>::type
666#else
667 void
668#endif
669 swap(unique_ptr<_Tp, _Dp>& __x,
670 unique_ptr<_Tp, _Dp>& __y) noexcept
671 { __x.swap(__y); }
672
673#if __cplusplus201103L > 201402L || !defined(__STRICT_ANSI__1) // c++1z or gnu++11
674 template<typename _Tp, typename _Dp>
675 typename enable_if<!__is_swappable<_Dp>::value>::type
676 swap(unique_ptr<_Tp, _Dp>&,
677 unique_ptr<_Tp, _Dp>&) = delete;
678#endif
679
680 template<typename _Tp, typename _Dp,
681 typename _Up, typename _Ep>
682 inline bool
683 operator==(const unique_ptr<_Tp, _Dp>& __x,
684 const unique_ptr<_Up, _Ep>& __y)
685 { return __x.get() == __y.get(); }
686
687 template<typename _Tp, typename _Dp>
688 inline bool
689 operator==(const unique_ptr<_Tp, _Dp>& __x, nullptr_t) noexcept
690 { return !__x; }
691
692 template<typename _Tp, typename _Dp>
693 inline bool
694 operator==(nullptr_t, const unique_ptr<_Tp, _Dp>& __x) noexcept
695 { return !__x; }
696
697 template<typename _Tp, typename _Dp,
698 typename _Up, typename _Ep>
699 inline bool
700 operator!=(const unique_ptr<_Tp, _Dp>& __x,
701 const unique_ptr<_Up, _Ep>& __y)
702 { return __x.get() != __y.get(); }
703
704 template<typename _Tp, typename _Dp>
705 inline bool
706 operator!=(const unique_ptr<_Tp, _Dp>& __x, nullptr_t) noexcept
707 { return (bool)__x; }
708
709 template<typename _Tp, typename _Dp>
710 inline bool
711 operator!=(nullptr_t, const unique_ptr<_Tp, _Dp>& __x) noexcept
712 { return (bool)__x; }
713
714 template<typename _Tp, typename _Dp,
715 typename _Up, typename _Ep>
716 inline bool
717 operator<(const unique_ptr<_Tp, _Dp>& __x,
718 const unique_ptr<_Up, _Ep>& __y)
719 {
720 typedef typename
721 std::common_type<typename unique_ptr<_Tp, _Dp>::pointer,
722 typename unique_ptr<_Up, _Ep>::pointer>::type _CT;
723 return std::less<_CT>()(__x.get(), __y.get());
724 }
725
726 template<typename _Tp, typename _Dp>
727 inline bool
728 operator<(const unique_ptr<_Tp, _Dp>& __x, nullptr_t)
729 { return std::less<typename unique_ptr<_Tp, _Dp>::pointer>()(__x.get(),
730 nullptr); }
731
732 template<typename _Tp, typename _Dp>
733 inline bool
734 operator<(nullptr_t, const unique_ptr<_Tp, _Dp>& __x)
735 { return std::less<typename unique_ptr<_Tp, _Dp>::pointer>()(nullptr,
736 __x.get()); }
737
738 template<typename _Tp, typename _Dp,
739 typename _Up, typename _Ep>
740 inline bool
741 operator<=(const unique_ptr<_Tp, _Dp>& __x,
742 const unique_ptr<_Up, _Ep>& __y)
743 { return !(__y < __x); }
744
745 template<typename _Tp, typename _Dp>
746 inline bool
747 operator<=(const unique_ptr<_Tp, _Dp>& __x, nullptr_t)
748 { return !(nullptr < __x); }
749
750 template<typename _Tp, typename _Dp>
751 inline bool
752 operator<=(nullptr_t, const unique_ptr<_Tp, _Dp>& __x)
753 { return !(__x < nullptr); }
754
755 template<typename _Tp, typename _Dp,
756 typename _Up, typename _Ep>
757 inline bool
758 operator>(const unique_ptr<_Tp, _Dp>& __x,
759 const unique_ptr<_Up, _Ep>& __y)
760 { return (__y < __x); }
761
762 template<typename _Tp, typename _Dp>
763 inline bool
764 operator>(const unique_ptr<_Tp, _Dp>& __x, nullptr_t)
765 { return std::less<typename unique_ptr<_Tp, _Dp>::pointer>()(nullptr,
766 __x.get()); }
767
768 template<typename _Tp, typename _Dp>
769 inline bool
770 operator>(nullptr_t, const unique_ptr<_Tp, _Dp>& __x)
771 { return std::less<typename unique_ptr<_Tp, _Dp>::pointer>()(__x.get(),
772 nullptr); }
773
774 template<typename _Tp, typename _Dp,
775 typename _Up, typename _Ep>
776 inline bool
777 operator>=(const unique_ptr<_Tp, _Dp>& __x,
778 const unique_ptr<_Up, _Ep>& __y)
779 { return !(__x < __y); }
780
781 template<typename _Tp, typename _Dp>
782 inline bool
783 operator>=(const unique_ptr<_Tp, _Dp>& __x, nullptr_t)
784 { return !(__x < nullptr); }
785
786 template<typename _Tp, typename _Dp>
787 inline bool
788 operator>=(nullptr_t, const unique_ptr<_Tp, _Dp>& __x)
789 { return !(nullptr < __x); }
790
791 /// std::hash specialization for unique_ptr.
792 template<typename _Tp, typename _Dp>
793 struct hash<unique_ptr<_Tp, _Dp>>
794 : public __hash_base<size_t, unique_ptr<_Tp, _Dp>>,
795 private __poison_hash<typename unique_ptr<_Tp, _Dp>::pointer>
796 {
797 size_t
798 operator()(const unique_ptr<_Tp, _Dp>& __u) const noexcept
799 {
800 typedef unique_ptr<_Tp, _Dp> _UP;
801 return std::hash<typename _UP::pointer>()(__u.get());
802 }
803 };
804
805#if __cplusplus201103L > 201103L
806
807#define __cpp_lib_make_unique 201304
808
809 template<typename _Tp>
810 struct _MakeUniq
811 { typedef unique_ptr<_Tp> __single_object; };
812
813 template<typename _Tp>
814 struct _MakeUniq<_Tp[]>
815 { typedef unique_ptr<_Tp[]> __array; };
816
817 template<typename _Tp, size_t _Bound>
818 struct _MakeUniq<_Tp[_Bound]>
819 { struct __invalid_type { }; };
820
821 /// std::make_unique for single objects
822 template<typename _Tp, typename... _Args>
823 inline typename _MakeUniq<_Tp>::__single_object
824 make_unique(_Args&&... __args)
825 { return unique_ptr<_Tp>(new _Tp(std::forward<_Args>(__args)...)); }
826
827 /// std::make_unique for arrays of unknown bound
828 template<typename _Tp>
829 inline typename _MakeUniq<_Tp>::__array
830 make_unique(size_t __num)
831 { return unique_ptr<_Tp>(new remove_extent_t<_Tp>[__num]()); }
832
833 /// Disable std::make_unique for arrays of known bound
834 template<typename _Tp, typename... _Args>
835 inline typename _MakeUniq<_Tp>::__invalid_type
836 make_unique(_Args&&...) = delete;
837#endif
838
839 // @} group pointer_abstractions
840
841_GLIBCXX_END_NAMESPACE_VERSION
842} // namespace
843
844#endif /* _UNIQUE_PTR_H */