#include "llvm/Support/MemoryBuffer.h"
#include "llvm/ADT/OwningPtr.h"
#include "llvm/ADT/SmallString.h"
+#include "llvm/System/Errno.h"
#include "llvm/System/Path.h"
#include "llvm/System/Process.h"
#include "llvm/System/Program.h"
/// successfully.
void MemoryBuffer::initCopyOf(const char *BufStart, const char *BufEnd) {
size_t Size = BufEnd-BufStart;
- BufferStart = (char *)malloc((Size+1) * sizeof(char));
+ BufferStart = (char *)malloc(Size+1);
BufferEnd = BufferStart+Size;
memcpy(const_cast<char*>(BufferStart), BufStart, Size);
*const_cast<char*>(BufferEnd) = 0; // Null terminate buffer.
class MemoryBufferMem : public MemoryBuffer {
std::string FileID;
public:
- MemoryBufferMem(const char *Start, const char *End, const char *FID,
- bool Copy = false)
+ MemoryBufferMem(StringRef InputData, StringRef FID, bool Copy = false)
: FileID(FID) {
if (!Copy)
- init(Start, End);
+ init(InputData.data(), InputData.data()+InputData.size());
else
- initCopyOf(Start, End);
+ initCopyOf(InputData.data(), InputData.data()+InputData.size());
}
virtual const char *getBufferIdentifier() const {
/// getMemBuffer - Open the specified memory range as a MemoryBuffer. Note
/// that EndPtr[0] must be a null byte and be accessible!
-MemoryBuffer *MemoryBuffer::getMemBuffer(const char *StartPtr,
- const char *EndPtr,
+MemoryBuffer *MemoryBuffer::getMemBuffer(StringRef InputData,
const char *BufferName) {
- return new MemoryBufferMem(StartPtr, EndPtr, BufferName);
+ return new MemoryBufferMem(InputData, BufferName);
}
/// getMemBufferCopy - Open the specified memory range as a MemoryBuffer,
/// copying the contents and taking ownership of it. This has no requirements
/// on EndPtr[0].
-MemoryBuffer *MemoryBuffer::getMemBufferCopy(const char *StartPtr,
- const char *EndPtr,
+MemoryBuffer *MemoryBuffer::getMemBufferCopy(StringRef InputData,
const char *BufferName) {
- return new MemoryBufferMem(StartPtr, EndPtr, BufferName, true);
+ return new MemoryBufferMem(InputData, BufferName, true);
}
/// getNewUninitMemBuffer - Allocate a new MemoryBuffer of the specified size
/// initialize the memory allocated by this method. The memory is owned by
/// the MemoryBuffer object.
MemoryBuffer *MemoryBuffer::getNewUninitMemBuffer(size_t Size,
- const char *BufferName) {
- char *Buf = (char *)malloc((Size+1) * sizeof(char));
+ StringRef BufferName) {
+ char *Buf = (char *)malloc(Size+1);
if (!Buf) return 0;
Buf[Size] = 0;
- MemoryBufferMem *SB = new MemoryBufferMem(Buf, Buf+Size, BufferName);
+ MemoryBufferMem *SB = new MemoryBufferMem(StringRef(Buf, Size), BufferName);
// The memory for this buffer is owned by the MemoryBuffer.
SB->MustDeleteBuffer = true;
return SB;
/// if the Filename is "-". If an error occurs, this returns null and fills
/// in *ErrStr with a reason. If stdin is empty, this API (unlike getSTDIN)
/// returns an empty buffer.
-MemoryBuffer *MemoryBuffer::getFileOrSTDIN(const char *Filename,
+MemoryBuffer *MemoryBuffer::getFileOrSTDIN(StringRef Filename,
std::string *ErrStr,
- int64_t FileSize) {
- if (Filename[0] != '-' || Filename[1] != 0)
- return getFile(Filename, ErrStr, FileSize);
- MemoryBuffer *M = getSTDIN();
- if (M) return M;
-
- // If stdin was empty, M is null. Cons up an empty memory buffer now.
- const char *EmptyStr = "";
- return MemoryBuffer::getMemBuffer(EmptyStr, EmptyStr, "<stdin>");
+ int64_t FileSize,
+ struct stat *FileInfo) {
+ if (Filename == "-")
+ return getSTDIN();
+ return getFile(Filename, ErrStr, FileSize, FileInfo);
}
//===----------------------------------------------------------------------===//
class MemoryBufferMMapFile : public MemoryBuffer {
std::string Filename;
public:
- MemoryBufferMMapFile(const char *filename, const char *Pages, uint64_t Size)
+ MemoryBufferMMapFile(StringRef filename, const char *Pages, uint64_t Size)
: Filename(filename) {
init(Pages, Pages+Size);
}
sys::Path::UnMapFilePages(getBufferStart(), getBufferSize());
}
};
+
+/// FileCloser - RAII object to make sure an FD gets closed properly.
+class FileCloser {
+ int FD;
+public:
+ FileCloser(int FD) : FD(FD) {}
+ ~FileCloser() { ::close(FD); }
+};
}
-MemoryBuffer *MemoryBuffer::getFile(const char *Filename, std::string *ErrStr,
- int64_t FileSize) {
+MemoryBuffer *MemoryBuffer::getFile(StringRef Filename, std::string *ErrStr,
+ int64_t FileSize, struct stat *FileInfo) {
int OpenFlags = 0;
#ifdef O_BINARY
OpenFlags |= O_BINARY; // Open input file in binary mode on win32.
#endif
- int FD = ::open(Filename, O_RDONLY|OpenFlags);
+ SmallString<256> PathBuf(Filename.begin(), Filename.end());
+ int FD = ::open(PathBuf.c_str(), O_RDONLY|OpenFlags);
if (FD == -1) {
- if (ErrStr) *ErrStr = "could not open file";
+ if (ErrStr) *ErrStr = sys::StrError();
return 0;
}
+ FileCloser FC(FD); // Close FD on return.
// If we don't know the file size, use fstat to find out. fstat on an open
// file descriptor is cheaper than stat on a random path.
- if (FileSize == -1) {
- struct stat FileInfo;
+ if (FileSize == -1 || FileInfo) {
+ struct stat MyFileInfo;
+ struct stat *FileInfoPtr = FileInfo? FileInfo : &MyFileInfo;
+
// TODO: This should use fstat64 when available.
- if (fstat(FD, &FileInfo) == -1) {
- if (ErrStr) *ErrStr = "could not get file length";
- ::close(FD);
+ if (fstat(FD, FileInfoPtr) == -1) {
+ if (ErrStr) *ErrStr = sys::StrError();
return 0;
}
- FileSize = FileInfo.st_size;
+ FileSize = FileInfoPtr->st_size;
}
// for small files, because this can severely fragment our address space. Also
// don't try to map files that are exactly a multiple of the system page size,
// as the file would not have the required null terminator.
+ //
+ // FIXME: Can we just mmap an extra page in the latter case?
if (FileSize >= 4096*4 &&
(FileSize & (sys::Process::GetPageSize()-1)) != 0) {
if (const char *Pages = sys::Path::MapInFilePages(FD, FileSize)) {
// Close the file descriptor, now that the whole file is in memory.
- ::close(FD);
return new MemoryBufferMMapFile(Filename, Pages, FileSize);
}
}
if (!Buf) {
// Failed to create a buffer.
if (ErrStr) *ErrStr = "could not allocate buffer";
- ::close(FD);
return 0;
}
OwningPtr<MemoryBuffer> SB(Buf);
char *BufPtr = const_cast<char*>(SB->getBufferStart());
-
+
size_t BytesLeft = FileSize;
while (BytesLeft) {
ssize_t NumRead = ::read(FD, BufPtr, BytesLeft);
- if (NumRead != -1) {
- BytesLeft -= NumRead;
- BufPtr += NumRead;
- } else if (errno == EINTR) {
- // try again
- } else {
- // error reading.
- close(FD);
- if (ErrStr) *ErrStr = "error reading file data";
+ if (NumRead == -1) {
+ if (errno == EINTR)
+ continue;
+ // Error while reading.
+ if (ErrStr) *ErrStr = sys::StrError();
return 0;
+ } else if (NumRead == 0) {
+ // We hit EOF early, truncate and terminate buffer.
+ Buf->BufferEnd = BufPtr;
+ *BufPtr = 0;
+ return SB.take();
}
+ BytesLeft -= NumRead;
+ BufPtr += NumRead;
}
- close(FD);
-
+
return SB.take();
}
std::vector<char> FileData;
// Read in all of the data from stdin, we cannot mmap stdin.
+ //
+ // FIXME: That isn't necessarily true, we should try to mmap stdin and
+ // fallback if it fails.
sys::Program::ChangeStdinToBinary();
size_t ReadBytes;
do {
FileData.push_back(0); // &FileData[Size] is invalid. So is &*FileData.end().
size_t Size = FileData.size();
- if (Size <= 1)
- return 0;
MemoryBuffer *B = new STDINBufferFile();
B->initCopyOf(&FileData[0], &FileData[Size-1]);
return B;
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