#include "llvm/Support/MemoryBuffer.h"
#include "llvm/ADT/OwningPtr.h"
#include "llvm/ADT/SmallString.h"
+#include "llvm/Support/MathExtras.h"
+#include "llvm/System/Errno.h"
#include "llvm/System/Path.h"
#include "llvm/System/Process.h"
#include "llvm/System/Program.h"
// MemoryBuffer implementation itself.
//===----------------------------------------------------------------------===//
-MemoryBuffer::~MemoryBuffer() {
- if (MustDeleteBuffer)
- free((void*)BufferStart);
-}
-
-/// initCopyOf - Initialize this source buffer with a copy of the specified
-/// memory range. We make the copy so that we can null terminate it
-/// successfully.
-void MemoryBuffer::initCopyOf(const char *BufStart, const char *BufEnd) {
- size_t Size = BufEnd-BufStart;
- BufferStart = (char *)malloc((Size+1) * sizeof(char));
- BufferEnd = BufferStart+Size;
- memcpy(const_cast<char*>(BufferStart), BufStart, Size);
- *const_cast<char*>(BufferEnd) = 0; // Null terminate buffer.
- MustDeleteBuffer = true;
-}
+MemoryBuffer::~MemoryBuffer() { }
/// init - Initialize this MemoryBuffer as a reference to externally allocated
/// memory, memory that we know is already null terminated.
assert(BufEnd[0] == 0 && "Buffer is not null terminated!");
BufferStart = BufStart;
BufferEnd = BufEnd;
- MustDeleteBuffer = false;
}
//===----------------------------------------------------------------------===//
// MemoryBufferMem implementation.
//===----------------------------------------------------------------------===//
+/// CopyStringRef - Copies contents of a StringRef into a block of memory and
+/// null-terminates it.
+static void CopyStringRef(char *Memory, StringRef Data) {
+ memcpy(Memory, Data.data(), Data.size());
+ Memory[Data.size()] = 0; // Null terminate string.
+}
+
+/// GetNamedBuffer - Allocates a new MemoryBuffer with Name copied after it.
+template <typename T>
+static T* GetNamedBuffer(StringRef Buffer, StringRef Name) {
+ char *Mem = static_cast<char*>(operator new(sizeof(T) + Name.size() + 1));
+ CopyStringRef(Mem + sizeof(T), Name);
+ return new (Mem) T(Buffer);
+}
+
namespace {
+/// MemoryBufferMem - Named MemoryBuffer pointing to a block of memory.
class MemoryBufferMem : public MemoryBuffer {
- std::string FileID;
public:
- MemoryBufferMem(const char *Start, const char *End, const char *FID,
- bool Copy = false)
- : FileID(FID) {
- if (!Copy)
- init(Start, End);
- else
- initCopyOf(Start, End);
+ MemoryBufferMem(StringRef InputData) {
+ init(InputData.begin(), InputData.end());
}
-
+
virtual const char *getBufferIdentifier() const {
- return FileID.c_str();
+ // The name is stored after the class itself.
+ return reinterpret_cast<const char*>(this + 1);
}
};
}
/// 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,
- const char *BufferName) {
- return new MemoryBufferMem(StartPtr, EndPtr, BufferName);
+MemoryBuffer *MemoryBuffer::getMemBuffer(StringRef InputData,
+ StringRef BufferName) {
+ return GetNamedBuffer<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,
- const char *BufferName) {
- return new MemoryBufferMem(StartPtr, EndPtr, BufferName, true);
+MemoryBuffer *MemoryBuffer::getMemBufferCopy(StringRef InputData,
+ StringRef BufferName) {
+ MemoryBuffer *Buf = getNewUninitMemBuffer(InputData.size(), BufferName);
+ if (!Buf) return 0;
+ memcpy(const_cast<char*>(Buf->getBufferStart()), InputData.data(),
+ InputData.size());
+ return Buf;
}
/// getNewUninitMemBuffer - Allocate a new MemoryBuffer of the specified size
-/// that is completely initialized to zeros. Note that the caller should
-/// initialize the memory allocated by this method. The memory is owned by
-/// the MemoryBuffer object.
+/// that is not initialized. Note that the caller should 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));
- if (!Buf) return 0;
- Buf[Size] = 0;
- MemoryBufferMem *SB = new MemoryBufferMem(Buf, Buf+Size, BufferName);
- // The memory for this buffer is owned by the MemoryBuffer.
- SB->MustDeleteBuffer = true;
- return SB;
+ StringRef BufferName) {
+ // Allocate space for the MemoryBuffer, the data and the name. It is important
+ // that MemoryBuffer and data are aligned so PointerIntPair works with them.
+ size_t AlignedStringLen =
+ RoundUpToAlignment(sizeof(MemoryBufferMem) + BufferName.size() + 1,
+ sizeof(void*)); // TODO: Is sizeof(void*) enough?
+ size_t RealLen = AlignedStringLen + Size + 1;
+ char *Mem = static_cast<char*>(operator new(RealLen, std::nothrow));
+ if (!Mem) return 0;
+
+ // The name is stored after the class itself.
+ CopyStringRef(Mem + sizeof(MemoryBufferMem), BufferName);
+
+ // The buffer begins after the name and must be aligned.
+ char *Buf = Mem + AlignedStringLen;
+ Buf[Size] = 0; // Null terminate buffer.
+
+ return new (Mem) MemoryBufferMem(StringRef(Buf, Size));
}
/// getNewMemBuffer - Allocate a new MemoryBuffer of the specified size that
/// is completely initialized to zeros. Note that the caller should
/// initialize the memory allocated by this method. The memory is owned by
/// the MemoryBuffer object.
-MemoryBuffer *MemoryBuffer::getNewMemBuffer(size_t Size,
- const char *BufferName) {
+MemoryBuffer *MemoryBuffer::getNewMemBuffer(size_t Size, StringRef BufferName) {
MemoryBuffer *SB = getNewUninitMemBuffer(Size, BufferName);
if (!SB) return 0;
- memset(const_cast<char*>(SB->getBufferStart()), 0, Size+1);
+ memset(const_cast<char*>(SB->getBufferStart()), 0, Size);
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(StringRef Filename,
+ std::string *ErrStr,
+ int64_t FileSize) {
+ if (Filename == "-")
+ return getSTDIN(ErrStr);
+ return getFile(Filename, ErrStr, FileSize);
+}
+
MemoryBuffer *MemoryBuffer::getFileOrSTDIN(const char *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>");
+ if (strcmp(Filename, "-") == 0)
+ return getSTDIN(ErrStr);
+ return getFile(Filename, ErrStr, FileSize);
}
//===----------------------------------------------------------------------===//
/// MemoryBufferMMapFile - This represents a file that was mapped in with the
/// sys::Path::MapInFilePages method. When destroyed, it calls the
/// sys::Path::UnMapFilePages method.
-class MemoryBufferMMapFile : public MemoryBuffer {
- std::string Filename;
+class MemoryBufferMMapFile : public MemoryBufferMem {
public:
- MemoryBufferMMapFile(const char *filename, const char *Pages, uint64_t Size)
- : Filename(filename) {
- init(Pages, Pages+Size);
- }
-
- virtual const char *getBufferIdentifier() const {
- return Filename.c_str();
- }
-
+ MemoryBufferMMapFile(StringRef Buffer)
+ : MemoryBufferMem(Buffer) { }
+
~MemoryBufferMMapFile() {
sys::Path::UnMapFilePages(getBufferStart(), getBufferSize());
}
};
+
+/// FileCloser - RAII object to make sure an FD gets closed properly.
+class FileCloser {
+ int FD;
+public:
+ explicit FileCloser(int FD) : FD(FD) {}
+ ~FileCloser() { ::close(FD); }
+};
+}
+
+MemoryBuffer *MemoryBuffer::getFile(StringRef Filename, std::string *ErrStr,
+ int64_t FileSize) {
+ SmallString<256> PathBuf(Filename.begin(), Filename.end());
+ return MemoryBuffer::getFile(PathBuf.c_str(), ErrStr, FileSize);
}
MemoryBuffer *MemoryBuffer::getFile(const char *Filename, std::string *ErrStr,
int64_t FileSize) {
- int OpenFlags = 0;
+ int OpenFlags = O_RDONLY;
#ifdef O_BINARY
OpenFlags |= O_BINARY; // Open input file in binary mode on win32.
#endif
- int FD = ::open(Filename, O_RDONLY|OpenFlags);
+ int FD = ::open(Filename, 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.
struct stat FileInfo;
// TODO: This should use fstat64 when available.
if (fstat(FD, &FileInfo) == -1) {
- if (ErrStr) *ErrStr = "could not get file length";
- ::close(FD);
+ if (ErrStr) *ErrStr = sys::StrError();
return 0;
}
FileSize = FileInfo.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);
+ return GetNamedBuffer<MemoryBufferMMapFile>(StringRef(Pages, FileSize),
+ Filename);
}
}
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 > 0) {
- BytesLeft -= NumRead;
- BufPtr += NumRead;
- } else if (NumRead == -1 && 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();
}
// MemoryBuffer::getSTDIN implementation.
//===----------------------------------------------------------------------===//
-namespace {
-class STDINBufferFile : public MemoryBuffer {
-public:
- virtual const char *getBufferIdentifier() const {
- return "<stdin>";
- }
-};
-}
-
-MemoryBuffer *MemoryBuffer::getSTDIN() {
- char Buffer[4096*4];
-
- std::vector<char> FileData;
-
+MemoryBuffer *MemoryBuffer::getSTDIN(std::string *ErrStr) {
// 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;
+
+ const ssize_t ChunkSize = 4096*4;
+ SmallString<ChunkSize> Buffer;
+ ssize_t ReadBytes;
+ // Read into Buffer until we hit EOF.
do {
- ReadBytes = fread(Buffer, sizeof(char), sizeof(Buffer), stdin);
- FileData.insert(FileData.end(), Buffer, Buffer+ReadBytes);
- } while (ReadBytes == sizeof(Buffer));
+ Buffer.reserve(Buffer.size() + ChunkSize);
+ ReadBytes = read(0, Buffer.end(), ChunkSize);
+ if (ReadBytes == -1) {
+ if (errno == EINTR) continue;
+ if (ErrStr) *ErrStr = sys::StrError();
+ return 0;
+ }
+ Buffer.set_size(Buffer.size() + ReadBytes);
+ } while (ReadBytes != 0);
- 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;
+ return getMemBufferCopy(Buffer, "<stdin>");
}
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