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[Support/MemoryBuffer] Introduce a boolean parameter (false by default) 'IsVolatile' for the open file functions.

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This provides a hint that the file may be changing often so mmap is avoided.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208007 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Argyrios Kyrtzidis
2014-05-05 21:55:51 +00:00
parent 73ebb5abaf
commit 32b6099a77
2 changed files with 50 additions and 24 deletions
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24
include/llvm/Support/MemoryBuffer.h
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@@ -67,34 +67,46 @@ public:
/// MemoryBuffer if successful, otherwise returning null. If FileSize is
/// specified, this means that the client knows that the file exists and that
/// it has the specified size.
///
/// \param IsVolatile true indicates that the file may be changing often.
static error_code getFile(Twine Filename, OwningPtr<MemoryBuffer> &Result,
int64_t FileSize = -1,
bool RequiresNullTerminator = true);
bool RequiresNullTerminator = true,
bool IsVolatile = false);
static error_code getFile(Twine Filename,
std::unique_ptr<MemoryBuffer> &Result,
int64_t FileSize = -1,
bool RequiresNullTerminator = true);
bool RequiresNullTerminator = true,
bool IsVolatile = false);
/// Given an already-open file descriptor, map some slice of it into a
/// MemoryBuffer. The slice is specified by an \p Offset and \p MapSize.
/// Since this is in the middle of a file, the buffer is not null terminated.
///
/// \param IsVolatile true indicates that the file may be changing often.
static error_code getOpenFileSlice(int FD, const char *Filename,
OwningPtr<MemoryBuffer> &Result,
uint64_t MapSize, int64_t Offset);
uint64_t MapSize, int64_t Offset,
bool IsVolatile = false);
static error_code getOpenFileSlice(int FD, const char *Filename,
std::unique_ptr<MemoryBuffer> &Result,
uint64_t MapSize, int64_t Offset);
uint64_t MapSize, int64_t Offset,
bool IsVolatile = false);
/// Given an already-open file descriptor, read the file and return a
/// MemoryBuffer.
///
/// \param IsVolatile true indicates that the file may be changing often.
static error_code getOpenFile(int FD, const char *Filename,
OwningPtr<MemoryBuffer> &Result,
uint64_t FileSize,
bool RequiresNullTerminator = true);
bool RequiresNullTerminator = true,
bool IsVolatile = false);
static error_code getOpenFile(int FD, const char *Filename,
std::unique_ptr<MemoryBuffer> &Result,
uint64_t FileSize,
bool RequiresNullTerminator = true);
bool RequiresNullTerminator = true,
bool IsVolatile = false);
/// getMemBuffer - Open the specified memory range as a MemoryBuffer. Note
/// that InputData must be null terminated if RequiresNullTerminator is true.