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add a MemoryBuffer::getOpenFile method, which turns an open

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file descriptor into a MemoryBuffer (and closes the FD).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120065 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2010-11-23 22:20:27 +00:00
parent 67ff104e7e
commit 7cf705461c
2 changed files with 16 additions and 4 deletions
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13
include/llvm/Support/MemoryBuffer.h
View File

@ -60,13 +60,18 @@ 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.
static MemoryBuffer *getFile(StringRef Filename,
std::string *ErrStr = 0,
static MemoryBuffer *getFile(StringRef Filename, std::string *ErrStr = 0,
int64_t FileSize = -1);
static MemoryBuffer *getFile(const char *Filename,
std::string *ErrStr = 0,
static MemoryBuffer *getFile(const char *Filename, std::string *ErrStr = 0,
int64_t FileSize = -1);
/// getOpenFile - Given an already-open file descriptor, read the file and
/// return a MemoryBuffer. This takes ownership of the descriptor,
/// immediately closing it after reading the file.
static MemoryBuffer *getOpenFile(int FD, const char *Filename,
std::string *ErrStr = 0,
int64_t FileSize = -1);
/// getMemBuffer - Open the specified memory range as a MemoryBuffer. Note
/// that InputData must be null terminated.
static MemoryBuffer *getMemBuffer(StringRef InputData,

7
lib/Support/MemoryBuffer.cpp
View File

@ -187,6 +187,7 @@ public:
MemoryBuffer *MemoryBuffer::getFile(StringRef Filename, std::string *ErrStr,
int64_t FileSize) {
// Ensure the path is null terminated.
SmallString<256> PathBuf(Filename.begin(), Filename.end());
return MemoryBuffer::getFile(PathBuf.c_str(), ErrStr, FileSize);
}
@ -202,6 +203,12 @@ MemoryBuffer *MemoryBuffer::getFile(const char *Filename, std::string *ErrStr,
if (ErrStr) *ErrStr = sys::StrError();
return 0;
}
return getOpenFile(FD, Filename, ErrStr, FileSize);
}
MemoryBuffer *MemoryBuffer::getOpenFile(int FD, const char *Filename,
std::string *ErrStr, int64_t FileSize) {
FileCloser FC(FD); // Close FD on return.
// If we don't know the file size, use fstat to find out. fstat on an open