LCOV - code coverage report
Current view: top level - lib/Support - MemoryBuffer.cpp (source / functions) Hit Total Coverage
Test: llvm-toolchain.info Lines: 155 168 92.3 %
Date: 2018-06-17 00:07:59 Functions: 39 54 72.2 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : //===--- MemoryBuffer.cpp - Memory Buffer implementation ------------------===//
       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 implements the MemoryBuffer interface.
      11             : //
      12             : //===----------------------------------------------------------------------===//
      13             : 
      14             : #include "llvm/Support/MemoryBuffer.h"
      15             : #include "llvm/ADT/SmallString.h"
      16             : #include "llvm/Config/config.h"
      17             : #include "llvm/Support/Errc.h"
      18             : #include "llvm/Support/Errno.h"
      19             : #include "llvm/Support/FileSystem.h"
      20             : #include "llvm/Support/MathExtras.h"
      21             : #include "llvm/Support/Path.h"
      22             : #include "llvm/Support/Process.h"
      23             : #include "llvm/Support/Program.h"
      24             : #include "llvm/Support/SmallVectorMemoryBuffer.h"
      25             : #include <cassert>
      26             : #include <cerrno>
      27             : #include <cstring>
      28             : #include <new>
      29             : #include <sys/types.h>
      30             : #include <system_error>
      31             : #if !defined(_MSC_VER) && !defined(__MINGW32__)
      32             : #include <unistd.h>
      33             : #else
      34             : #include <io.h>
      35             : #endif
      36             : using namespace llvm;
      37             : 
      38             : //===----------------------------------------------------------------------===//
      39             : // MemoryBuffer implementation itself.
      40             : //===----------------------------------------------------------------------===//
      41             : 
      42      873089 : MemoryBuffer::~MemoryBuffer() { }
      43             : 
      44             : /// init - Initialize this MemoryBuffer as a reference to externally allocated
      45             : /// memory, memory that we know is already null terminated.
      46     1167400 : void MemoryBuffer::init(const char *BufStart, const char *BufEnd,
      47             :                         bool RequiresNullTerminator) {
      48             :   assert((!RequiresNullTerminator || BufEnd[0] == 0) &&
      49             :          "Buffer is not null terminated!");
      50     1167400 :   BufferStart = BufStart;
      51     1167400 :   BufferEnd = BufEnd;
      52     1167400 : }
      53             : 
      54             : //===----------------------------------------------------------------------===//
      55             : // MemoryBufferMem implementation.
      56             : //===----------------------------------------------------------------------===//
      57             : 
      58             : /// CopyStringRef - Copies contents of a StringRef into a block of memory and
      59             : /// null-terminates it.
      60             : static void CopyStringRef(char *Memory, StringRef Data) {
      61     1167069 :   if (!Data.empty())
      62     1129354 :     memcpy(Memory, Data.data(), Data.size());
      63     1167069 :   Memory[Data.size()] = 0; // Null terminate string.
      64             : }
      65             : 
      66             : namespace {
      67             : struct NamedBufferAlloc {
      68             :   const Twine &Name;
      69      339279 :   NamedBufferAlloc(const Twine &Name) : Name(Name) {}
      70             : };
      71             : }
      72             : 
      73      339285 : void *operator new(size_t N, const NamedBufferAlloc &Alloc) {
      74             :   SmallString<256> NameBuf;
      75      339285 :   StringRef NameRef = Alloc.Name.toStringRef(NameBuf);
      76             : 
      77      339280 :   char *Mem = static_cast<char *>(operator new(N + NameRef.size() + 1));
      78      339280 :   CopyStringRef(Mem + N, NameRef);
      79      339280 :   return Mem;
      80             : }
      81             : 
      82             : namespace {
      83             : /// MemoryBufferMem - Named MemoryBuffer pointing to a block of memory.
      84             : template<typename MB>
      85     2254837 : class MemoryBufferMem : public MB {
      86             : public:
      87     1102605 :   MemoryBufferMem(StringRef InputData, bool RequiresNullTerminator) {
      88     1377421 :     MemoryBuffer::init(InputData.begin(), InputData.end(),
      89             :                        RequiresNullTerminator);
      90             :   }
      91             : 
      92             :   /// Disable sized deallocation for MemoryBufferMem, because it has
      93             :   /// tail-allocated data.
      94      843174 :   void operator delete(void *p) { ::operator delete(p); }
      95             : 
      96      845007 :   StringRef getBufferIdentifier() const override {
      97             :     // The name is stored after the class itself.
      98     1690014 :     return StringRef(reinterpret_cast<const char *>(this + 1));
      99             :   }
     100             : 
     101           2 :   MemoryBuffer::BufferKind getBufferKind() const override {
     102           2 :     return MemoryBuffer::MemoryBuffer_Malloc;
     103             :   }
     104             : };
     105             : }
     106             : 
     107             : template <typename MB>
     108             : static ErrorOr<std::unique_ptr<MB>>
     109             : getFileAux(const Twine &Filename, int64_t FileSize, uint64_t MapSize,
     110             :            uint64_t Offset, bool RequiresNullTerminator, bool IsVolatile);
     111             : 
     112             : std::unique_ptr<MemoryBuffer>
     113      274820 : MemoryBuffer::getMemBuffer(StringRef InputData, StringRef BufferName,
     114             :                            bool RequiresNullTerminator) {
     115      274828 :   auto *Ret = new (NamedBufferAlloc(BufferName))
     116      549640 :       MemoryBufferMem<MemoryBuffer>(InputData, RequiresNullTerminator);
     117      274828 :   return std::unique_ptr<MemoryBuffer>(Ret);
     118             : }
     119             : 
     120             : std::unique_ptr<MemoryBuffer>
     121       37670 : MemoryBuffer::getMemBuffer(MemoryBufferRef Ref, bool RequiresNullTerminator) {
     122             :   return std::unique_ptr<MemoryBuffer>(getMemBuffer(
     123       37670 :       Ref.getBuffer(), Ref.getBufferIdentifier(), RequiresNullTerminator));
     124             : }
     125             : 
     126             : static ErrorOr<std::unique_ptr<WritableMemoryBuffer>>
     127      411107 : getMemBufferCopyImpl(StringRef InputData, const Twine &BufferName) {
     128      411107 :   auto Buf = WritableMemoryBuffer::getNewUninitMemBuffer(InputData.size(), BufferName);
     129      411107 :   if (!Buf)
     130             :     return make_error_code(errc::not_enough_memory);
     131      411107 :   memcpy(Buf->getBufferStart(), InputData.data(), InputData.size());
     132             :   return std::move(Buf);
     133             : }
     134             : 
     135             : std::unique_ptr<MemoryBuffer>
     136      220878 : MemoryBuffer::getMemBufferCopy(StringRef InputData, const Twine &BufferName) {
     137      220878 :   auto Buf = getMemBufferCopyImpl(InputData, BufferName);
     138      220878 :   if (Buf)
     139             :     return std::move(*Buf);
     140             :   return nullptr;
     141             : }
     142             : 
     143             : ErrorOr<std::unique_ptr<MemoryBuffer>>
     144      164430 : MemoryBuffer::getFileOrSTDIN(const Twine &Filename, int64_t FileSize,
     145             :                              bool RequiresNullTerminator) {
     146             :   SmallString<256> NameBuf;
     147      164430 :   StringRef NameRef = Filename.toStringRef(NameBuf);
     148             : 
     149             :   if (NameRef == "-")
     150       87261 :     return getSTDIN();
     151       77169 :   return getFile(Filename, FileSize, RequiresNullTerminator);
     152             : }
     153             : 
     154             : ErrorOr<std::unique_ptr<MemoryBuffer>>
     155           9 : MemoryBuffer::getFileSlice(const Twine &FilePath, uint64_t MapSize, 
     156             :                            uint64_t Offset, bool IsVolatile) {
     157             :   return getFileAux<MemoryBuffer>(FilePath, -1, MapSize, Offset, false,
     158           9 :                                   IsVolatile);
     159             : }
     160             : 
     161             : //===----------------------------------------------------------------------===//
     162             : // MemoryBuffer::getFile implementation.
     163             : //===----------------------------------------------------------------------===//
     164             : 
     165             : namespace {
     166             : /// Memory maps a file descriptor using sys::fs::mapped_file_region.
     167             : ///
     168             : /// This handles converting the offset into a legal offset on the platform.
     169             : template<typename MB>
     170       60765 : class MemoryBufferMMapFile : public MB {
     171             :   sys::fs::mapped_file_region MFR;
     172             : 
     173             :   static uint64_t getLegalMapOffset(uint64_t Offset) {
     174      128918 :     return Offset & ~(sys::fs::mapped_file_region::alignment() - 1);
     175             :   }
     176             : 
     177             :   static uint64_t getLegalMapSize(uint64_t Len, uint64_t Offset) {
     178       64459 :     return Len + (Offset - getLegalMapOffset(Offset));
     179             :   }
     180             : 
     181             :   const char *getStart(uint64_t Len, uint64_t Offset) {
     182      128918 :     return MFR.const_data() + (Offset - getLegalMapOffset(Offset));
     183             :   }
     184             : 
     185             : public:
     186       64459 :   MemoryBufferMMapFile(bool RequiresNullTerminator, int FD, uint64_t Len,
     187             :                        uint64_t Offset, std::error_code &EC)
     188             :       : MFR(FD, MB::Mapmode, getLegalMapSize(Len, Offset),
     189      128918 :             getLegalMapOffset(Offset), EC) {
     190       64459 :     if (!EC) {
     191             :       const char *Start = getStart(Len, Offset);
     192       64459 :       MemoryBuffer::init(Start, Start + Len, RequiresNullTerminator);
     193             :     }
     194       64459 :   }
     195             : 
     196             :   /// Disable sized deallocation for MemoryBufferMMapFile, because it has
     197             :   /// tail-allocated data.
     198       29667 :   void operator delete(void *p) { ::operator delete(p); }
     199             : 
     200       71122 :   StringRef getBufferIdentifier() const override {
     201             :     // The name is stored after the class itself.
     202      142244 :     return StringRef(reinterpret_cast<const char *>(this + 1));
     203             :   }
     204             : 
     205           0 :   MemoryBuffer::BufferKind getBufferKind() const override {
     206           0 :     return MemoryBuffer::MemoryBuffer_MMap;
     207             :   }
     208             : };
     209             : }
     210             : 
     211             : static ErrorOr<std::unique_ptr<WritableMemoryBuffer>>
     212      190229 : getMemoryBufferForStream(int FD, const Twine &BufferName) {
     213      190229 :   const ssize_t ChunkSize = 4096*4;
     214             :   SmallString<ChunkSize> Buffer;
     215             :   ssize_t ReadBytes;
     216             :   // Read into Buffer until we hit EOF.
     217             :   do {
     218    13617488 :     Buffer.reserve(Buffer.size() + ChunkSize);
     219    13617488 :     ReadBytes = sys::RetryAfterSignal(-1, ::read, FD, Buffer.end(), ChunkSize);
     220    13617488 :     if (ReadBytes == -1)
     221           0 :       return std::error_code(errno, std::generic_category());
     222    13617488 :     Buffer.set_size(Buffer.size() + ReadBytes);
     223    13617488 :   } while (ReadBytes != 0);
     224             : 
     225      190229 :   return getMemBufferCopyImpl(Buffer, BufferName);
     226             : }
     227             : 
     228             : 
     229             : ErrorOr<std::unique_ptr<MemoryBuffer>>
     230      108848 : MemoryBuffer::getFile(const Twine &Filename, int64_t FileSize,
     231             :                       bool RequiresNullTerminator, bool IsVolatile) {
     232             :   return getFileAux<MemoryBuffer>(Filename, FileSize, FileSize, 0,
     233      108848 :                                   RequiresNullTerminator, IsVolatile);
     234             : }
     235             : 
     236             : template <typename MB>
     237             : static ErrorOr<std::unique_ptr<MB>>
     238             : getOpenFileImpl(int FD, const Twine &Filename, uint64_t FileSize,
     239             :                 uint64_t MapSize, int64_t Offset, bool RequiresNullTerminator,
     240             :                 bool IsVolatile);
     241             : 
     242             : template <typename MB>
     243             : static ErrorOr<std::unique_ptr<MB>>
     244      134143 : getFileAux(const Twine &Filename, int64_t FileSize, uint64_t MapSize,
     245             :            uint64_t Offset, bool RequiresNullTerminator, bool IsVolatile) {
     246             :   int FD;
     247      134143 :   std::error_code EC = sys::fs::openFileForRead(Filename, FD, sys::fs::OF_None);
     248             : 
     249      134143 :   if (EC)
     250             :     return EC;
     251             : 
     252      105275 :   auto Ret = getOpenFileImpl<MB>(FD, Filename, FileSize, MapSize, Offset,
     253             :                                  RequiresNullTerminator, IsVolatile);
     254      105275 :   close(FD);
     255             :   return Ret;
     256             : }
     257             : 
     258             : ErrorOr<std::unique_ptr<WritableMemoryBuffer>>
     259         370 : WritableMemoryBuffer::getFile(const Twine &Filename, int64_t FileSize,
     260             :                               bool IsVolatile) {
     261             :   return getFileAux<WritableMemoryBuffer>(Filename, FileSize, FileSize, 0,
     262             :                                           /*RequiresNullTerminator*/ false,
     263         370 :                                           IsVolatile);
     264             : }
     265             : 
     266             : ErrorOr<std::unique_ptr<WritableMemoryBuffer>>
     267       24916 : WritableMemoryBuffer::getFileSlice(const Twine &Filename, uint64_t MapSize,
     268             :                                    uint64_t Offset, bool IsVolatile) {
     269             :   return getFileAux<WritableMemoryBuffer>(Filename, -1, MapSize, Offset, false,
     270       24916 :                                           IsVolatile);
     271             : }
     272             : 
     273             : std::unique_ptr<WritableMemoryBuffer>
     274      827790 : WritableMemoryBuffer::getNewUninitMemBuffer(size_t Size, const Twine &BufferName) {
     275             :   using MemBuffer = MemoryBufferMem<WritableMemoryBuffer>;
     276             :   // Allocate space for the MemoryBuffer, the data and the name. It is important
     277             :   // that MemoryBuffer and data are aligned so PointerIntPair works with them.
     278             :   // TODO: Is 16-byte alignment enough?  We copy small object files with large
     279             :   // alignment expectations into this buffer.
     280             :   SmallString<256> NameBuf;
     281      827790 :   StringRef NameRef = BufferName.toStringRef(NameBuf);
     282             :   size_t AlignedStringLen = alignTo(sizeof(MemBuffer) + NameRef.size() + 1, 16);
     283      827789 :   size_t RealLen = AlignedStringLen + Size + 1;
     284      827789 :   char *Mem = static_cast<char*>(operator new(RealLen, std::nothrow));
     285      827789 :   if (!Mem)
     286             :     return nullptr;
     287             : 
     288             :   // The name is stored after the class itself.
     289      827789 :   CopyStringRef(Mem + sizeof(MemBuffer), NameRef);
     290             : 
     291             :   // The buffer begins after the name and must be aligned.
     292      827789 :   char *Buf = Mem + AlignedStringLen;
     293      827789 :   Buf[Size] = 0; // Null terminate buffer.
     294             : 
     295             :   auto *Ret = new (Mem) MemBuffer(StringRef(Buf, Size), true);
     296             :   return std::unique_ptr<WritableMemoryBuffer>(Ret);
     297             : }
     298             : 
     299             : std::unique_ptr<WritableMemoryBuffer>
     300        7267 : WritableMemoryBuffer::getNewMemBuffer(size_t Size, const Twine &BufferName) {
     301        7267 :   auto SB = WritableMemoryBuffer::getNewUninitMemBuffer(Size, BufferName);
     302        7267 :   if (!SB)
     303             :     return nullptr;
     304        7267 :   memset(SB->getBufferStart(), 0, Size);
     305             :   return SB;
     306             : }
     307             : 
     308      473030 : static bool shouldUseMmap(int FD,
     309             :                           size_t FileSize,
     310             :                           size_t MapSize,
     311             :                           off_t Offset,
     312             :                           bool RequiresNullTerminator,
     313             :                           int PageSize,
     314             :                           bool IsVolatile) {
     315             :   // mmap may leave the buffer without null terminator if the file size changed
     316             :   // by the time the last page is mapped in, so avoid it if the file size is
     317             :   // likely to change.
     318      473030 :   if (IsVolatile)
     319             :     return false;
     320             : 
     321             :   // We don't use mmap for small files because this can severely fragment our
     322             :   // address space.
     323      469330 :   if (MapSize < 4 * 4096 || MapSize < (unsigned)PageSize)
     324             :     return false;
     325             : 
     326       64509 :   if (!RequiresNullTerminator)
     327             :     return true;
     328             : 
     329             :   // If we don't know the file size, use fstat to find out.  fstat on an open
     330             :   // file descriptor is cheaper than stat on a random path.
     331             :   // FIXME: this chunk of code is duplicated, but it avoids a fstat when
     332             :   // RequiresNullTerminator = false and MapSize != -1.
     333       62839 :   if (FileSize == size_t(-1)) {
     334           0 :     sys::fs::file_status Status;
     335           0 :     if (sys::fs::status(FD, Status))
     336           0 :       return false;
     337           0 :     FileSize = Status.getSize();
     338             :   }
     339             : 
     340             :   // If we need a null terminator and the end of the map is inside the file,
     341             :   // we cannot use mmap.
     342       62839 :   size_t End = Offset + MapSize;
     343             :   assert(End <= FileSize);
     344       62839 :   if (End != FileSize)
     345             :     return false;
     346             : 
     347             :   // Don't try to map files that are exactly a multiple of the system page size
     348             :   // if we need a null terminator.
     349       62839 :   if ((FileSize & (PageSize -1)) == 0)
     350             :     return false;
     351             : 
     352             : #if defined(__CYGWIN__)
     353             :   // Don't try to map files that are exactly a multiple of the physical page size
     354             :   // if we need a null terminator.
     355             :   // FIXME: We should reorganize again getPageSize() on Win32.
     356             :   if ((FileSize & (4096 - 1)) == 0)
     357             :     return false;
     358             : #endif
     359             : 
     360       62788 :   return true;
     361             : }
     362             : 
     363             : static ErrorOr<std::unique_ptr<WriteThroughMemoryBuffer>>
     364           1 : getReadWriteFile(const Twine &Filename, uint64_t FileSize, uint64_t MapSize,
     365             :                  uint64_t Offset) {
     366             :   int FD;
     367             :   std::error_code EC = sys::fs::openFileForReadWrite(
     368           1 :       Filename, FD, sys::fs::CD_OpenExisting, sys::fs::OF_None);
     369             : 
     370           1 :   if (EC)
     371             :     return EC;
     372             : 
     373             :   // Default is to map the full file.
     374           1 :   if (MapSize == uint64_t(-1)) {
     375             :     // If we don't know the file size, use fstat to find out.  fstat on an open
     376             :     // file descriptor is cheaper than stat on a random path.
     377           1 :     if (FileSize == uint64_t(-1)) {
     378           1 :       sys::fs::file_status Status;
     379           1 :       std::error_code EC = sys::fs::status(FD, Status);
     380           1 :       if (EC)
     381           0 :         return EC;
     382             : 
     383             :       // If this not a file or a block device (e.g. it's a named pipe
     384             :       // or character device), we can't mmap it, so error out.
     385           1 :       sys::fs::file_type Type = Status.type();
     386           2 :       if (Type != sys::fs::file_type::regular_file &&
     387           1 :           Type != sys::fs::file_type::block_file)
     388             :         return make_error_code(errc::invalid_argument);
     389             : 
     390           1 :       FileSize = Status.getSize();
     391             :     }
     392             :     MapSize = FileSize;
     393             :   }
     394             : 
     395             :   std::unique_ptr<WriteThroughMemoryBuffer> Result(
     396           1 :       new (NamedBufferAlloc(Filename))
     397             :           MemoryBufferMMapFile<WriteThroughMemoryBuffer>(false, FD, MapSize,
     398           1 :                                                          Offset, EC));
     399           1 :   if (EC)
     400             :     return EC;
     401             :   return std::move(Result);
     402             : }
     403             : 
     404             : ErrorOr<std::unique_ptr<WriteThroughMemoryBuffer>>
     405           1 : WriteThroughMemoryBuffer::getFile(const Twine &Filename, int64_t FileSize) {
     406           1 :   return getReadWriteFile(Filename, FileSize, FileSize, 0);
     407             : }
     408             : 
     409             : /// Map a subrange of the specified file as a WritableMemoryBuffer.
     410             : ErrorOr<std::unique_ptr<WriteThroughMemoryBuffer>>
     411           0 : WriteThroughMemoryBuffer::getFileSlice(const Twine &Filename, uint64_t MapSize,
     412             :                                        uint64_t Offset) {
     413           0 :   return getReadWriteFile(Filename, -1, MapSize, Offset);
     414             : }
     415             : 
     416             : template <typename MB>
     417             : static ErrorOr<std::unique_ptr<MB>>
     418      473077 : getOpenFileImpl(int FD, const Twine &Filename, uint64_t FileSize,
     419             :                 uint64_t MapSize, int64_t Offset, bool RequiresNullTerminator,
     420             :                 bool IsVolatile) {
     421      473077 :   static int PageSize = sys::Process::getPageSize();
     422             : 
     423             :   // Default is to map the full file.
     424      473077 :   if (MapSize == uint64_t(-1)) {
     425             :     // If we don't know the file size, use fstat to find out.  fstat on an open
     426             :     // file descriptor is cheaper than stat on a random path.
     427      139001 :     if (FileSize == uint64_t(-1)) {
     428      139001 :       sys::fs::file_status Status;
     429      139001 :       std::error_code EC = sys::fs::status(FD, Status);
     430      139001 :       if (EC)
     431          47 :         return EC;
     432             : 
     433             :       // If this not a file or a block device (e.g. it's a named pipe
     434             :       // or character device), we can't trust the size. Create the memory
     435             :       // buffer by copying off the stream.
     436      139001 :       sys::fs::file_type Type = Status.type();
     437      278002 :       if (Type != sys::fs::file_type::regular_file &&
     438      139001 :           Type != sys::fs::file_type::block_file)
     439          94 :         return getMemoryBufferForStream(FD, Filename);
     440             : 
     441      138954 :       FileSize = Status.getSize();
     442             :     }
     443             :     MapSize = FileSize;
     444             :   }
     445             : 
     446      473030 :   if (shouldUseMmap(FD, FileSize, MapSize, Offset, RequiresNullTerminator,
     447             :                     PageSize, IsVolatile)) {
     448             :     std::error_code EC;
     449       64458 :     std::unique_ptr<MB> Result(
     450       64458 :         new (NamedBufferAlloc(Filename)) MemoryBufferMMapFile<MB>(
     451             :             RequiresNullTerminator, FD, MapSize, Offset, EC));
     452       64458 :     if (!EC)
     453             :       return std::move(Result);
     454             :   }
     455             : 
     456      408572 :   auto Buf = WritableMemoryBuffer::getNewUninitMemBuffer(MapSize, Filename);
     457      408571 :   if (!Buf) {
     458             :     // Failed to create a buffer. The only way it can fail is if
     459             :     // new(std::nothrow) returns 0.
     460             :     return make_error_code(errc::not_enough_memory);
     461             :   }
     462             : 
     463      408571 :   char *BufPtr = Buf.get()->getBufferStart();
     464             : 
     465      408571 :   size_t BytesLeft = MapSize;
     466             : #ifndef HAVE_PREAD
     467             :   if (lseek(FD, Offset, SEEK_SET) == -1)
     468             :     return std::error_code(errno, std::generic_category());
     469             : #endif
     470             : 
     471     1224725 :   while (BytesLeft) {
     472             : #ifdef HAVE_PREAD
     473      408093 :     ssize_t NumRead = sys::RetryAfterSignal(-1, ::pread, FD, BufPtr, BytesLeft,
     474      816187 :                                             MapSize - BytesLeft + Offset);
     475             : #else
     476             :     ssize_t NumRead = sys::RetryAfterSignal(-1, ::read, FD, BufPtr, BytesLeft);
     477             : #endif
     478      408094 :     if (NumRead == -1) {
     479             :       // Error while reading.
     480           0 :       return std::error_code(errno, std::generic_category());
     481             :     }
     482      408094 :     if (NumRead == 0) {
     483          17 :       memset(BufPtr, 0, BytesLeft); // zero-initialize rest of the buffer.
     484          17 :       break;
     485             :     }
     486      408077 :     BytesLeft -= NumRead;
     487      408077 :     BufPtr += NumRead;
     488             :   }
     489             : 
     490             :   return std::move(Buf);
     491             : }
     492             : 
     493             : ErrorOr<std::unique_ptr<MemoryBuffer>>
     494      367800 : MemoryBuffer::getOpenFile(int FD, const Twine &Filename, uint64_t FileSize,
     495             :                           bool RequiresNullTerminator, bool IsVolatile) {
     496             :   return getOpenFileImpl<MemoryBuffer>(FD, Filename, FileSize, FileSize, 0,
     497      367800 :                          RequiresNullTerminator, IsVolatile);
     498             : }
     499             : 
     500             : ErrorOr<std::unique_ptr<MemoryBuffer>>
     501           2 : MemoryBuffer::getOpenFileSlice(int FD, const Twine &Filename, uint64_t MapSize,
     502             :                                int64_t Offset, bool IsVolatile) {
     503             :   assert(MapSize != uint64_t(-1));
     504             :   return getOpenFileImpl<MemoryBuffer>(FD, Filename, -1, MapSize, Offset, false,
     505           2 :                                        IsVolatile);
     506             : }
     507             : 
     508       87791 : ErrorOr<std::unique_ptr<MemoryBuffer>> MemoryBuffer::getSTDIN() {
     509             :   // Read in all of the data from stdin, we cannot mmap stdin.
     510             :   //
     511             :   // FIXME: That isn't necessarily true, we should try to mmap stdin and
     512             :   // fallback if it fails.
     513       87791 :   sys::ChangeStdinToBinary();
     514             : 
     515      175582 :   return getMemoryBufferForStream(0, "<stdin>");
     516             : }
     517             : 
     518             : ErrorOr<std::unique_ptr<MemoryBuffer>>
     519      102391 : MemoryBuffer::getFileAsStream(const Twine &Filename) {
     520             :   int FD;
     521      102391 :   std::error_code EC = sys::fs::openFileForRead(Filename, FD, sys::fs::OF_None);
     522      102391 :   if (EC)
     523             :     return EC;
     524             :   ErrorOr<std::unique_ptr<MemoryBuffer>> Ret =
     525      204782 :       getMemoryBufferForStream(FD, Filename);
     526      102391 :   close(FD);
     527             :   return Ret;
     528             : }
     529             : 
     530       47826 : MemoryBufferRef MemoryBuffer::getMemBufferRef() const {
     531             :   StringRef Data = getBuffer();
     532       47826 :   StringRef Identifier = getBufferIdentifier();
     533       47826 :   return MemoryBufferRef(Data, Identifier);
     534             : }
     535             : 
     536           0 : void MemoryBuffer::anchor() {}
     537           0 : void SmallVectorMemoryBuffer::anchor() {}

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