MemoryBuffer.cpp File Reference

#include "llvm/Support/MemoryBuffer.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/Config/config.h"
#include "llvm/Support/Alignment.h"
#include "llvm/Support/Errc.h"
#include "llvm/Support/Error.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Process.h"
#include "llvm/Support/Program.h"
#include "llvm/Support/SmallVectorMemoryBuffer.h"
#include <algorithm>
#include <cassert>
#include <cstring>
#include <new>
#include <sys/types.h>
#include <system_error>
#include <unistd.h>

Go to the source code of this file.

Functions
static void	CopyStringRef (char *Memory, StringRef Data)
	CopyStringRef - Copies contents of a StringRef into a block of memory and null-terminates it.
void *	operator new (size_t N, const NamedBufferAlloc &Alloc)
template<typename MB >
static ErrorOr< std::unique_ptr< MB > >	getFileAux (const Twine &Filename, uint64_t MapSize, uint64_t Offset, bool IsText, bool RequiresNullTerminator, bool IsVolatile, std::optional< Align > Alignment)
static ErrorOr< std::unique_ptr< WritableMemoryBuffer > >	getMemBufferCopyImpl (StringRef InputData, const Twine &BufferName)
static ErrorOr< std::unique_ptr< WritableMemoryBuffer > >	getMemoryBufferForStream (sys::fs::file_t FD, const Twine &BufferName)
template<typename MB >
static ErrorOr< std::unique_ptr< MB > >	getOpenFileImpl (sys::fs::file_t FD, const Twine &Filename, uint64_t FileSize, uint64_t MapSize, int64_t Offset, bool RequiresNullTerminator, bool IsVolatile, std::optional< Align > Alignment)
static bool	shouldUseMmap (sys::fs::file_t FD, size_t FileSize, size_t MapSize, off_t Offset, bool RequiresNullTerminator, int PageSize, bool IsVolatile)
static ErrorOr< std::unique_ptr< WriteThroughMemoryBuffer > >	getReadWriteFile (const Twine &Filename, uint64_t FileSize, uint64_t MapSize, uint64_t Offset)

Function Documentation

CopyStringRef()

static void CopyStringRef ( char *  Memory, StringRef  Data  )

static

CopyStringRef - Copies contents of a StringRef into a block of memory and null-terminates it.

Definition at line 64 of file MemoryBuffer.cpp.

References llvm::Data.

Referenced by llvm::WritableMemoryBuffer::getNewUninitMemBuffer(), and operator new().

getFileAux()

template<typename MB >

static ErrorOr< std::unique_ptr< MB > > getFileAux ( const Twine &  Filename, uint64_t  MapSize, uint64_t  Offset, bool  IsText, bool  RequiresNullTerminator, bool  IsVolatile, std::optional< Align >  Alignment  )

static

Definition at line 276 of file MemoryBuffer.cpp.

References llvm::sys::fs::closeFile(), llvm::errorToErrorCode(), llvm::sys::fs::OF_None, llvm::sys::fs::OF_TextWithCRLF, llvm::Offset, llvm::sys::fs::openNativeFileForRead(), and llvm::Expected< T >::takeError().

getMemBufferCopyImpl()

static ErrorOr< std::unique_ptr< WritableMemoryBuffer > > getMemBufferCopyImpl ( StringRef  InputData, const Twine &  BufferName  )

static

Definition at line 143 of file MemoryBuffer.cpp.

References llvm::copy(), llvm::WritableMemoryBuffer::getNewUninitMemBuffer(), llvm::make_error_code(), llvm::not_enough_memory, and llvm::StringRef::size().

Referenced by llvm::MemoryBuffer::getMemBufferCopy(), and getMemoryBufferForStream().

getMemoryBufferForStream()

static ErrorOr< std::unique_ptr< WritableMemoryBuffer > > getMemoryBufferForStream ( sys::fs::file_t  FD, const Twine &  BufferName  )

static

Definition at line 252 of file MemoryBuffer.cpp.

References llvm::errorToErrorCode(), getMemBufferCopyImpl(), and llvm::sys::fs::readNativeFileToEOF().

Referenced by llvm::MemoryBuffer::getFileAsStream(), getOpenFileImpl(), and llvm::MemoryBuffer::getSTDIN().

getOpenFileImpl()

template<typename MB >

static ErrorOr< std::unique_ptr< MB > > getOpenFileImpl ( sys::fs::file_t  FD, const Twine &  Filename, uint64_t  FileSize, uint64_t  MapSize, int64_t  Offset, bool  RequiresNullTerminator, bool  IsVolatile, std::optional< Align >  Alignment  )

static

Definition at line 472 of file MemoryBuffer.cpp.

References llvm::sys::fs::block_file, llvm::MutableArrayRef< T >::data(), llvm::MutableArrayRef< T >::drop_front(), llvm::ArrayRef< T >::empty(), llvm::errorToErrorCode(), llvm::ErrorOr< T >::getError(), getMemoryBufferForStream(), llvm::WritableMemoryBuffer::getNewUninitMemBuffer(), llvm::sys::Process::getPageSizeEstimate(), llvm::make_error_code(), llvm::not_enough_memory, llvm::Offset, PageSize, llvm::sys::fs::readNativeFileSlice(), llvm::sys::fs::regular_file, shouldUseMmap(), llvm::ArrayRef< T >::size(), llvm::sys::fs::status(), and llvm::Expected< T >::takeError().

getReadWriteFile()

static ErrorOr< std::unique_ptr< WriteThroughMemoryBuffer > > getReadWriteFile ( const Twine &  Filename, uint64_t  FileSize, uint64_t  MapSize, uint64_t  Offset  )

static

Definition at line 418 of file MemoryBuffer.cpp.

References llvm::sys::fs::block_file, llvm::sys::fs::CD_OpenExisting, llvm::errorToErrorCode(), llvm::invalid_argument, llvm::make_error_code(), llvm::sys::fs::OF_None, llvm::Offset, llvm::sys::fs::openNativeFileForReadWrite(), llvm::sys::fs::regular_file, llvm::sys::fs::status(), and llvm::Expected< T >::takeError().

Referenced by llvm::WriteThroughMemoryBuffer::getFile(), and llvm::WriteThroughMemoryBuffer::getFileSlice().

operator new()

void * operator new	(	size_t	N,
		const NamedBufferAlloc &	Alloc
	)

Definition at line 77 of file MemoryBuffer.cpp.

References llvm::Alloc, CopyStringRef(), N, llvm::report_bad_alloc_error(), and llvm::StringRef::size().

shouldUseMmap()

static bool shouldUseMmap ( sys::fs::file_t  FD, size_t  FileSize, size_t  MapSize, off_t  Offset, bool  RequiresNullTerminator, int  PageSize, bool  IsVolatile  )

static

Definition at line 357 of file MemoryBuffer.cpp.

References assert(), End, llvm::Offset, PageSize, and llvm::sys::fs::status().

Referenced by getOpenFileImpl().