1//===--- MemoryBuffer.cpp - Memory Buffer implementation ------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file implements the MemoryBuffer interface.
10//
11//===----------------------------------------------------------------------===//
12
13#include "llvm/Support/MemoryBuffer.h"
14#include "llvm/ADT/STLExtras.h"
15#include "llvm/ADT/SmallString.h"
16#include "llvm/Config/config.h"
17#include "llvm/Support/Alignment.h"
18#include "llvm/Support/Errc.h"
19#include "llvm/Support/Error.h"
20#include "llvm/Support/ErrorHandling.h"
21#include "llvm/Support/FileSystem.h"
22#include "llvm/Support/MathExtras.h"
23#include "llvm/Support/Process.h"
24#include "llvm/Support/Program.h"
25#include "llvm/Support/SmallVectorMemoryBuffer.h"
26#include <algorithm>
27#include <cassert>
28#include <cstring>
29#include <new>
30#include <sys/types.h>
31#include <system_error>
32#if !defined(_MSC_VER) && !defined(__MINGW32__)
33#include <unistd.h>
34#else
35#include <io.h>
36#endif
37
38#ifdef __MVS__
39#include "llvm/Support/AutoConvert.h"
40#endif
41using namespace llvm;
42
43//===----------------------------------------------------------------------===//
44// MemoryBuffer implementation itself.
45//===----------------------------------------------------------------------===//
46
47MemoryBuffer::~MemoryBuffer() = default;
48
49/// init - Initialize this MemoryBuffer as a reference to externally allocated
50/// memory, memory that we know is already null terminated.
51void MemoryBuffer::init(const char *BufStart, const char *BufEnd,
52 bool RequiresNullTerminator) {
53 assert((!RequiresNullTerminator || BufEnd[0] == 0) &&
54 "Buffer is not null terminated!");
55 BufferStart = BufStart;
56 BufferEnd = BufEnd;
57}
58
59//===----------------------------------------------------------------------===//
60// MemoryBufferMem implementation.
61//===----------------------------------------------------------------------===//
62
63/// CopyStringRef - Copies contents of a StringRef into a block of memory and
64/// null-terminates it.
65static void CopyStringRef(char *Memory, StringRef Data) {
66 if (!Data.empty())
67 memcpy(dest: Memory, src: Data.data(), n: Data.size());
68 Memory[Data.size()] = 0; // Null terminate string.
69}
70
71namespace {
72struct NamedBufferAlloc {
73 const Twine &Name;
74 NamedBufferAlloc(const Twine &Name) : Name(Name) {}
75};
76} // namespace
77
78void *operator new(size_t N, const NamedBufferAlloc &Alloc) {
79 SmallString<256> NameBuf;
80 StringRef NameRef = Alloc.Name.toStringRef(Out&: NameBuf);
81
82 char *Mem = static_cast<char *>(operator new(N + sizeof(size_t) +
83 NameRef.size() + 1));
84 *reinterpret_cast<size_t *>(Mem + N) = NameRef.size();
85 CopyStringRef(Memory: Mem + N + sizeof(size_t), Data: NameRef);
86 return Mem;
87}
88
89namespace {
90/// MemoryBufferMem - Named MemoryBuffer pointing to a block of memory.
91template<typename MB>
92class MemoryBufferMem : public MB {
93public:
94 MemoryBufferMem(StringRef InputData, bool RequiresNullTerminator) {
95 MemoryBuffer::init(BufStart: InputData.begin(), BufEnd: InputData.end(),
96 RequiresNullTerminator);
97 }
98
99 /// Disable sized deallocation for MemoryBufferMem, because it has
100 /// tail-allocated data.
101 void operator delete(void *p) { ::operator delete(p); }
102
103 StringRef getBufferIdentifier() const override {
104 // The name is stored after the class itself.
105 return StringRef(reinterpret_cast<const char *>(this + 1) + sizeof(size_t),
106 *reinterpret_cast<const size_t *>(this + 1));
107 }
108
109 MemoryBuffer::BufferKind getBufferKind() const override {
110 return MemoryBuffer::MemoryBuffer_Malloc;
111 }
112};
113} // namespace
114
115template <typename MB>
116static ErrorOr<std::unique_ptr<MB>>
117getFileAux(const Twine &Filename, uint64_t MapSize, uint64_t Offset,
118 bool IsText, bool RequiresNullTerminator, bool IsVolatile,
119 std::optional<Align> Alignment);
120
121std::unique_ptr<MemoryBuffer>
122MemoryBuffer::getMemBuffer(StringRef InputData, StringRef BufferName,
123 bool RequiresNullTerminator) {
124 auto *Ret = new (NamedBufferAlloc(BufferName))
125 MemoryBufferMem<MemoryBuffer>(InputData, RequiresNullTerminator);
126 return std::unique_ptr<MemoryBuffer>(Ret);
127}
128
129std::unique_ptr<MemoryBuffer>
130MemoryBuffer::getMemBuffer(MemoryBufferRef Ref, bool RequiresNullTerminator) {
131 return std::unique_ptr<MemoryBuffer>(getMemBuffer(
132 InputData: Ref.getBuffer(), BufferName: Ref.getBufferIdentifier(), RequiresNullTerminator));
133}
134
135static ErrorOr<std::unique_ptr<WritableMemoryBuffer>>
136getMemBufferCopyImpl(StringRef InputData, const Twine &BufferName) {
137 auto Buf =
138 WritableMemoryBuffer::getNewUninitMemBuffer(Size: InputData.size(), BufferName);
139 if (!Buf)
140 return make_error_code(E: errc::not_enough_memory);
141 // Calling memcpy with null src/dst is UB, and an empty StringRef is
142 // represented with {nullptr, 0}.
143 llvm::copy(Range&: InputData, Out: Buf->getBufferStart());
144 return std::move(Buf);
145}
146
147std::unique_ptr<MemoryBuffer>
148MemoryBuffer::getMemBufferCopy(StringRef InputData, const Twine &BufferName) {
149 auto Buf = getMemBufferCopyImpl(InputData, BufferName);
150 if (Buf)
151 return std::move(*Buf);
152 return nullptr;
153}
154
155ErrorOr<std::unique_ptr<MemoryBuffer>>
156MemoryBuffer::getFileOrSTDIN(const Twine &Filename, bool IsText,
157 bool RequiresNullTerminator,
158 std::optional<Align> Alignment) {
159 SmallString<256> NameBuf;
160 StringRef NameRef = Filename.toStringRef(Out&: NameBuf);
161
162 if (NameRef == "-")
163 return getSTDIN();
164 return getFile(Filename, IsText, RequiresNullTerminator,
165 /*IsVolatile=*/false, Alignment);
166}
167
168ErrorOr<std::unique_ptr<MemoryBuffer>>
169MemoryBuffer::getFileSlice(const Twine &FilePath, uint64_t MapSize,
170 uint64_t Offset, bool IsVolatile,
171 std::optional<Align> Alignment) {
172 return getFileAux<MemoryBuffer>(Filename: FilePath, MapSize, Offset, /*IsText=*/false,
173 /*RequiresNullTerminator=*/false, IsVolatile,
174 Alignment);
175}
176
177//===----------------------------------------------------------------------===//
178// MemoryBuffer::getFile implementation.
179//===----------------------------------------------------------------------===//
180
181namespace {
182
183template <typename MB>
184constexpr sys::fs::mapped_file_region::mapmode Mapmode =
185 sys::fs::mapped_file_region::readonly;
186template <>
187constexpr sys::fs::mapped_file_region::mapmode Mapmode<MemoryBuffer> =
188 sys::fs::mapped_file_region::readonly;
189template <>
190constexpr sys::fs::mapped_file_region::mapmode Mapmode<WritableMemoryBuffer> =
191 sys::fs::mapped_file_region::priv;
192template <>
193constexpr sys::fs::mapped_file_region::mapmode
194 Mapmode<WriteThroughMemoryBuffer> = sys::fs::mapped_file_region::readwrite;
195
196/// Memory maps a file descriptor using sys::fs::mapped_file_region.
197///
198/// This handles converting the offset into a legal offset on the platform.
199template<typename MB>
200class MemoryBufferMMapFile : public MB {
201 sys::fs::mapped_file_region MFR;
202
203 static uint64_t getLegalMapOffset(uint64_t Offset) {
204 return Offset & ~(sys::fs::mapped_file_region::alignment() - 1);
205 }
206
207 static uint64_t getLegalMapSize(uint64_t Len, uint64_t Offset) {
208 return Len + (Offset - getLegalMapOffset(Offset));
209 }
210
211 const char *getStart(uint64_t Len, uint64_t Offset) {
212 return MFR.const_data() + (Offset - getLegalMapOffset(Offset));
213 }
214
215public:
216 MemoryBufferMMapFile(bool RequiresNullTerminator, sys::fs::file_t FD, uint64_t Len,
217 uint64_t Offset, std::error_code &EC)
218 : MFR(FD, Mapmode<MB>, getLegalMapSize(Len, Offset),
219 getLegalMapOffset(Offset), EC) {
220 if (!EC) {
221 const char *Start = getStart(Len, Offset);
222 MemoryBuffer::init(BufStart: Start, BufEnd: Start + Len, RequiresNullTerminator);
223 }
224 }
225
226 /// Disable sized deallocation for MemoryBufferMMapFile, because it has
227 /// tail-allocated data.
228 void operator delete(void *p) { ::operator delete(p); }
229
230 StringRef getBufferIdentifier() const override {
231 // The name is stored after the class itself.
232 return StringRef(reinterpret_cast<const char *>(this + 1) + sizeof(size_t),
233 *reinterpret_cast<const size_t *>(this + 1));
234 }
235
236 MemoryBuffer::BufferKind getBufferKind() const override {
237 return MemoryBuffer::MemoryBuffer_MMap;
238 }
239
240 void dontNeedIfMmap() override { MFR.dontNeed(); }
241};
242} // namespace
243
244static ErrorOr<std::unique_ptr<WritableMemoryBuffer>>
245getMemoryBufferForStream(sys::fs::file_t FD, const Twine &BufferName) {
246 SmallString<sys::fs::DefaultReadChunkSize> Buffer;
247 if (Error E = sys::fs::readNativeFileToEOF(FileHandle: FD, Buffer))
248 return errorToErrorCode(Err: std::move(E));
249 return getMemBufferCopyImpl(InputData: Buffer, BufferName);
250}
251
252ErrorOr<std::unique_ptr<MemoryBuffer>>
253MemoryBuffer::getFile(const Twine &Filename, bool IsText,
254 bool RequiresNullTerminator, bool IsVolatile,
255 std::optional<Align> Alignment) {
256 return getFileAux<MemoryBuffer>(Filename, /*MapSize=*/-1, /*Offset=*/0,
257 IsText, RequiresNullTerminator, IsVolatile,
258 Alignment);
259}
260
261template <typename MB>
262static ErrorOr<std::unique_ptr<MB>>
263getOpenFileImpl(sys::fs::file_t FD, const Twine &Filename, uint64_t FileSize,
264 uint64_t MapSize, int64_t Offset, bool RequiresNullTerminator,
265 bool IsVolatile, std::optional<Align> Alignment);
266
267template <typename MB>
268static ErrorOr<std::unique_ptr<MB>>
269getFileAux(const Twine &Filename, uint64_t MapSize, uint64_t Offset,
270 bool IsText, bool RequiresNullTerminator, bool IsVolatile,
271 std::optional<Align> Alignment) {
272 Expected<sys::fs::file_t> FDOrErr = sys::fs::openNativeFileForRead(
273 Name: Filename, Flags: IsText ? sys::fs::OF_TextWithCRLF : sys::fs::OF_None);
274 if (!FDOrErr)
275 return errorToErrorCode(Err: FDOrErr.takeError());
276 sys::fs::file_t FD = *FDOrErr;
277 auto Ret = getOpenFileImpl<MB>(FD, Filename, /*FileSize=*/-1, MapSize, Offset,
278 RequiresNullTerminator, IsVolatile, Alignment);
279 sys::fs::closeFile(F&: FD);
280 return Ret;
281}
282
283ErrorOr<std::unique_ptr<WritableMemoryBuffer>>
284WritableMemoryBuffer::getFile(const Twine &Filename, bool IsVolatile,
285 std::optional<Align> Alignment) {
286 return getFileAux<WritableMemoryBuffer>(
287 Filename, /*MapSize=*/-1, /*Offset=*/0, /*IsText=*/false,
288 /*RequiresNullTerminator=*/false, IsVolatile, Alignment);
289}
290
291ErrorOr<std::unique_ptr<WritableMemoryBuffer>>
292WritableMemoryBuffer::getFileSlice(const Twine &Filename, uint64_t MapSize,
293 uint64_t Offset, bool IsVolatile,
294 std::optional<Align> Alignment) {
295 return getFileAux<WritableMemoryBuffer>(
296 Filename, MapSize, Offset, /*IsText=*/false,
297 /*RequiresNullTerminator=*/false, IsVolatile, Alignment);
298}
299
300std::unique_ptr<WritableMemoryBuffer>
301WritableMemoryBuffer::getNewUninitMemBuffer(size_t Size,
302 const Twine &BufferName,
303 std::optional<Align> Alignment) {
304 using MemBuffer = MemoryBufferMem<WritableMemoryBuffer>;
305
306 // Use 16-byte alignment if no alignment is specified.
307 Align BufAlign = Alignment.value_or(u: Align(16));
308
309 // Allocate space for the MemoryBuffer, the data and the name. It is important
310 // that MemoryBuffer and data are aligned so PointerIntPair works with them.
311 SmallString<256> NameBuf;
312 StringRef NameRef = BufferName.toStringRef(Out&: NameBuf);
313
314 size_t StringLen = sizeof(MemBuffer) + sizeof(size_t) + NameRef.size() + 1;
315 size_t RealLen = StringLen + Size + 1 + BufAlign.value();
316 if (RealLen <= Size) // Check for rollover.
317 return nullptr;
318 char *Mem = static_cast<char*>(operator new(RealLen, std::nothrow));
319 if (!Mem)
320 return nullptr;
321
322 // The name is stored after the class itself.
323 *reinterpret_cast<size_t *>(Mem + sizeof(MemBuffer)) = NameRef.size();
324 CopyStringRef(Memory: Mem + sizeof(MemBuffer) + sizeof(size_t), Data: NameRef);
325
326 // The buffer begins after the name and must be aligned.
327 char *Buf = (char *)alignAddr(Addr: Mem + StringLen, Alignment: BufAlign);
328 Buf[Size] = 0; // Null terminate buffer.
329
330 auto *Ret = new (Mem) MemBuffer(StringRef(Buf, Size), true);
331 return std::unique_ptr<WritableMemoryBuffer>(Ret);
332}
333
334std::unique_ptr<WritableMemoryBuffer>
335WritableMemoryBuffer::getNewMemBuffer(size_t Size, const Twine &BufferName) {
336 auto SB = WritableMemoryBuffer::getNewUninitMemBuffer(Size, BufferName);
337 if (!SB)
338 return nullptr;
339 memset(s: SB->getBufferStart(), c: 0, n: Size);
340 return SB;
341}
342
343static bool shouldUseMmap(sys::fs::file_t FD,
344 size_t FileSize,
345 size_t MapSize,
346 off_t Offset,
347 bool RequiresNullTerminator,
348 int PageSize,
349 bool IsVolatile) {
350 // mmap may leave the buffer without null terminator if the file size changed
351 // by the time the last page is mapped in, so avoid it if the file size is
352 // likely to change.
353 if (IsVolatile && RequiresNullTerminator)
354 return false;
355
356 // We don't use mmap for small files because this can severely fragment our
357 // address space.
358 if (MapSize < 4 * 4096 || MapSize < (unsigned)PageSize)
359 return false;
360
361 if (!RequiresNullTerminator)
362 return true;
363
364 // If we don't know the file size, use fstat to find out. fstat on an open
365 // file descriptor is cheaper than stat on a random path.
366 // FIXME: this chunk of code is duplicated, but it avoids a fstat when
367 // RequiresNullTerminator = false and MapSize != -1.
368 if (FileSize == size_t(-1)) {
369 sys::fs::file_status Status;
370 if (sys::fs::status(FD, Result&: Status))
371 return false;
372 FileSize = Status.getSize();
373 }
374
375 // If we need a null terminator and the end of the map is inside the file,
376 // we cannot use mmap.
377 size_t End = Offset + MapSize;
378 assert(End <= FileSize);
379 if (End != FileSize)
380 return false;
381
382 // Don't try to map files that are exactly a multiple of the system page size
383 // if we need a null terminator.
384 if ((FileSize & (PageSize -1)) == 0)
385 return false;
386
387#if defined(__CYGWIN__)
388 // Don't try to map files that are exactly a multiple of the physical page size
389 // if we need a null terminator.
390 // FIXME: We should reorganize again getPageSize() on Win32.
391 if ((FileSize & (4096 - 1)) == 0)
392 return false;
393#endif
394
395 return true;
396}
397
398static ErrorOr<std::unique_ptr<WriteThroughMemoryBuffer>>
399getReadWriteFile(const Twine &Filename, uint64_t FileSize, uint64_t MapSize,
400 uint64_t Offset) {
401 Expected<sys::fs::file_t> FDOrErr = sys::fs::openNativeFileForReadWrite(
402 Name: Filename, Disp: sys::fs::CD_OpenExisting, Flags: sys::fs::OF_None);
403 if (!FDOrErr)
404 return errorToErrorCode(Err: FDOrErr.takeError());
405 sys::fs::file_t FD = *FDOrErr;
406
407 // Default is to map the full file.
408 if (MapSize == uint64_t(-1)) {
409 // If we don't know the file size, use fstat to find out. fstat on an open
410 // file descriptor is cheaper than stat on a random path.
411 if (FileSize == uint64_t(-1)) {
412 sys::fs::file_status Status;
413 std::error_code EC = sys::fs::status(FD, Result&: Status);
414 if (EC)
415 return EC;
416
417 // If this not a file or a block device (e.g. it's a named pipe
418 // or character device), we can't mmap it, so error out.
419 sys::fs::file_type Type = Status.type();
420 if (Type != sys::fs::file_type::regular_file &&
421 Type != sys::fs::file_type::block_file)
422 return make_error_code(E: errc::invalid_argument);
423
424 FileSize = Status.getSize();
425 }
426 MapSize = FileSize;
427 }
428
429 std::error_code EC;
430 std::unique_ptr<WriteThroughMemoryBuffer> Result(
431 new (NamedBufferAlloc(Filename))
432 MemoryBufferMMapFile<WriteThroughMemoryBuffer>(false, FD, MapSize,
433 Offset, EC));
434 if (EC)
435 return EC;
436 return std::move(Result);
437}
438
439ErrorOr<std::unique_ptr<WriteThroughMemoryBuffer>>
440WriteThroughMemoryBuffer::getFile(const Twine &Filename, int64_t FileSize) {
441 return getReadWriteFile(Filename, FileSize, MapSize: FileSize, Offset: 0);
442}
443
444/// Map a subrange of the specified file as a WritableMemoryBuffer.
445ErrorOr<std::unique_ptr<WriteThroughMemoryBuffer>>
446WriteThroughMemoryBuffer::getFileSlice(const Twine &Filename, uint64_t MapSize,
447 uint64_t Offset) {
448 return getReadWriteFile(Filename, FileSize: -1, MapSize, Offset);
449}
450
451template <typename MB>
452static ErrorOr<std::unique_ptr<MB>>
453getOpenFileImpl(sys::fs::file_t FD, const Twine &Filename, uint64_t FileSize,
454 uint64_t MapSize, int64_t Offset, bool RequiresNullTerminator,
455 bool IsVolatile, std::optional<Align> Alignment) {
456 static int PageSize = sys::Process::getPageSizeEstimate();
457
458 // Default is to map the full file.
459 if (MapSize == uint64_t(-1)) {
460 // If we don't know the file size, use fstat to find out. fstat on an open
461 // file descriptor is cheaper than stat on a random path.
462 if (FileSize == uint64_t(-1)) {
463 sys::fs::file_status Status;
464 std::error_code EC = sys::fs::status(FD, Result&: Status);
465 if (EC)
466 return EC;
467
468 // If this not a file or a block device (e.g. it's a named pipe
469 // or character device), we can't trust the size. Create the memory
470 // buffer by copying off the stream.
471 sys::fs::file_type Type = Status.type();
472 if (Type != sys::fs::file_type::regular_file &&
473 Type != sys::fs::file_type::block_file)
474 return getMemoryBufferForStream(FD, BufferName: Filename);
475
476 FileSize = Status.getSize();
477 }
478 MapSize = FileSize;
479 }
480
481 if (shouldUseMmap(FD, FileSize, MapSize, Offset, RequiresNullTerminator,
482 PageSize, IsVolatile)) {
483 std::error_code EC;
484 std::unique_ptr<MB> Result(
485 new (NamedBufferAlloc(Filename)) MemoryBufferMMapFile<MB>(
486 RequiresNullTerminator, FD, MapSize, Offset, EC));
487 if (!EC)
488 return std::move(Result);
489 }
490
491#ifdef __MVS__
492 // Set codepage auto-conversion for z/OS.
493 if (auto EC = llvm::enableAutoConversion(FD))
494 return EC;
495#endif
496
497 auto Buf =
498 WritableMemoryBuffer::getNewUninitMemBuffer(Size: MapSize, BufferName: Filename, Alignment);
499 if (!Buf) {
500 // Failed to create a buffer. The only way it can fail is if
501 // new(std::nothrow) returns 0.
502 return make_error_code(E: errc::not_enough_memory);
503 }
504
505 // Read until EOF, zero-initialize the rest.
506 MutableArrayRef<char> ToRead = Buf->getBuffer();
507 while (!ToRead.empty()) {
508 Expected<size_t> ReadBytes =
509 sys::fs::readNativeFileSlice(FileHandle: FD, Buf: ToRead, Offset);
510 if (!ReadBytes)
511 return errorToErrorCode(Err: ReadBytes.takeError());
512 if (*ReadBytes == 0) {
513 std::memset(s: ToRead.data(), c: 0, n: ToRead.size());
514 break;
515 }
516 ToRead = ToRead.drop_front(N: *ReadBytes);
517 Offset += *ReadBytes;
518 }
519
520 return std::move(Buf);
521}
522
523ErrorOr<std::unique_ptr<MemoryBuffer>>
524MemoryBuffer::getOpenFile(sys::fs::file_t FD, const Twine &Filename,
525 uint64_t FileSize, bool RequiresNullTerminator,
526 bool IsVolatile, std::optional<Align> Alignment) {
527 return getOpenFileImpl<MemoryBuffer>(FD, Filename, FileSize, MapSize: FileSize, Offset: 0,
528 RequiresNullTerminator, IsVolatile,
529 Alignment);
530}
531
532ErrorOr<std::unique_ptr<MemoryBuffer>> MemoryBuffer::getOpenFileSlice(
533 sys::fs::file_t FD, const Twine &Filename, uint64_t MapSize, int64_t Offset,
534 bool IsVolatile, std::optional<Align> Alignment) {
535 assert(MapSize != uint64_t(-1));
536 return getOpenFileImpl<MemoryBuffer>(FD, Filename, FileSize: -1, MapSize, Offset, RequiresNullTerminator: false,
537 IsVolatile, Alignment);
538}
539
540ErrorOr<std::unique_ptr<MemoryBuffer>> MemoryBuffer::getSTDIN() {
541 // Read in all of the data from stdin, we cannot mmap stdin.
542 //
543 // FIXME: That isn't necessarily true, we should try to mmap stdin and
544 // fallback if it fails.
545 sys::ChangeStdinMode(Flags: sys::fs::OF_Text);
546
547 return getMemoryBufferForStream(FD: sys::fs::getStdinHandle(), BufferName: "<stdin>");
548}
549
550ErrorOr<std::unique_ptr<MemoryBuffer>>
551MemoryBuffer::getFileAsStream(const Twine &Filename) {
552 Expected<sys::fs::file_t> FDOrErr =
553 sys::fs::openNativeFileForRead(Name: Filename, Flags: sys::fs::OF_None);
554 if (!FDOrErr)
555 return errorToErrorCode(Err: FDOrErr.takeError());
556 sys::fs::file_t FD = *FDOrErr;
557 ErrorOr<std::unique_ptr<MemoryBuffer>> Ret =
558 getMemoryBufferForStream(FD, BufferName: Filename);
559 sys::fs::closeFile(F&: FD);
560 return Ret;
561}
562
563MemoryBufferRef MemoryBuffer::getMemBufferRef() const {
564 StringRef Data = getBuffer();
565 StringRef Identifier = getBufferIdentifier();
566 return MemoryBufferRef(Data, Identifier);
567}
568
569SmallVectorMemoryBuffer::~SmallVectorMemoryBuffer() = default;
570

source code of llvm/lib/Support/MemoryBuffer.cpp