#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"
+#include "llvm/Support/MathExtras.h"
+#include "llvm/Support/Errno.h"
+#include "llvm/Support/Path.h"
+#include "llvm/Support/Process.h"
+#include "llvm/Support/Program.h"
+#include "llvm/Support/system_error.h"
#include <cassert>
#include <cstdio>
#include <cstring>
#include <cerrno>
+#include <new>
#include <sys/types.h>
#include <sys/stat.h>
#if !defined(_MSC_VER) && !defined(__MINGW32__)
#include <fcntl.h>
using namespace llvm;
+namespace { const llvm::error_code success; }
+
//===----------------------------------------------------------------------===//
// 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);
- 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(StringRef InputData, StringRef FID, bool Copy = false)
- : FileID(FID) {
- if (!Copy)
- init(InputData.data(), InputData.data()+InputData.size());
- else
- initCopyOf(InputData.data(), InputData.data()+InputData.size());
+ 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(StringRef InputData,
- const char *BufferName) {
- return new MemoryBufferMem(InputData, BufferName);
+ 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(StringRef InputData,
- const char *BufferName) {
- return new MemoryBufferMem(InputData, BufferName, true);
+ 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,
StringRef BufferName) {
- char *Buf = (char *)malloc(Size+1);
- if (!Buf) return 0;
- Buf[Size] = 0;
- MemoryBufferMem *SB = new MemoryBufferMem(StringRef(Buf, Size), BufferName);
- // The memory for this buffer is owned by the MemoryBuffer.
- SB->MustDeleteBuffer = true;
- return SB;
+ // 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,
- struct stat *FileInfo) {
+error_code MemoryBuffer::getFileOrSTDIN(StringRef Filename,
+ OwningPtr<MemoryBuffer> &result,
+ int64_t FileSize) {
if (Filename == "-")
- return getSTDIN();
- return getFile(Filename, ErrStr, FileSize, FileInfo);
+ return getSTDIN(result);
+ return getFile(Filename, result, FileSize);
+}
+
+error_code MemoryBuffer::getFileOrSTDIN(const char *Filename,
+ OwningPtr<MemoryBuffer> &result,
+ int64_t FileSize) {
+ if (strcmp(Filename, "-") == 0)
+ return getSTDIN(result);
+ return getFile(Filename, result, 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(StringRef 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());
}
class FileCloser {
int FD;
public:
- FileCloser(int FD) : FD(FD) {}
+ explicit FileCloser(int FD) : FD(FD) {}
~FileCloser() { ::close(FD); }
};
}
-MemoryBuffer *MemoryBuffer::getFile(StringRef Filename, std::string *ErrStr,
- int64_t FileSize, struct stat *FileInfo) {
- int OpenFlags = 0;
+error_code MemoryBuffer::getFile(StringRef Filename,
+ OwningPtr<MemoryBuffer> &result,
+ int64_t FileSize) {
+ // Ensure the path is null terminated.
+ SmallString<256> PathBuf(Filename.begin(), Filename.end());
+ return MemoryBuffer::getFile(PathBuf.c_str(), result, FileSize);
+}
+
+error_code MemoryBuffer::getFile(const char *Filename,
+ OwningPtr<MemoryBuffer> &result,
+ int64_t FileSize) {
+ int OpenFlags = O_RDONLY;
#ifdef O_BINARY
OpenFlags |= O_BINARY; // Open input file in binary mode on win32.
#endif
- SmallString<256> PathBuf(Filename.begin(), Filename.end());
- int FD = ::open(PathBuf.c_str(), O_RDONLY|OpenFlags);
+ int FD = ::open(Filename, OpenFlags);
if (FD == -1) {
- if (ErrStr) *ErrStr = sys::StrError();
- return 0;
+ return error_code(errno, posix_category());
}
+
+ return getOpenFile(FD, Filename, result, FileSize);
+}
+
+error_code MemoryBuffer::getOpenFile(int FD, const char *Filename,
+ OwningPtr<MemoryBuffer> &result,
+ 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
// file descriptor is cheaper than stat on a random path.
- if (FileSize == -1 || FileInfo) {
- struct stat MyFileInfo;
- struct stat *FileInfoPtr = FileInfo? FileInfo : &MyFileInfo;
-
+ if (FileSize == -1) {
+ struct stat FileInfo;
// TODO: This should use fstat64 when available.
- if (fstat(FD, FileInfoPtr) == -1) {
- if (ErrStr) *ErrStr = sys::StrError();
- return 0;
+ if (fstat(FD, &FileInfo) == -1) {
+ return error_code(errno, posix_category());
}
- FileSize = FileInfoPtr->st_size;
+ FileSize = FileInfo.st_size;
}
-
-
+
+
// If the file is large, try to use mmap to read it in. We don't use mmap
// 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,
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.
- return new MemoryBufferMMapFile(Filename, Pages, FileSize);
+ result.reset(GetNamedBuffer<MemoryBufferMMapFile>(
+ StringRef(Pages, FileSize), Filename));
+ return success;
}
}
MemoryBuffer *Buf = MemoryBuffer::getNewUninitMemBuffer(FileSize, Filename);
if (!Buf) {
- // Failed to create a buffer.
- if (ErrStr) *ErrStr = "could not allocate buffer";
- return 0;
+ // Failed to create a buffer. The only way it can fail is if
+ // new(std::nothrow) returns 0.
+ return make_error_code(errc::not_enough_memory);
}
OwningPtr<MemoryBuffer> SB(Buf);
if (errno == EINTR)
continue;
// Error while reading.
- if (ErrStr) *ErrStr = sys::StrError();
- return 0;
+ return error_code(errno, posix_category());
} else if (NumRead == 0) {
// We hit EOF early, truncate and terminate buffer.
Buf->BufferEnd = BufPtr;
*BufPtr = 0;
- return SB.take();
+ result.swap(SB);
+ return success;
}
BytesLeft -= NumRead;
BufPtr += NumRead;
}
- return SB.take();
+ result.swap(SB);
+ return success;
}
//===----------------------------------------------------------------------===//
// 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;
-
+error_code MemoryBuffer::getSTDIN(OwningPtr<MemoryBuffer> &result) {
// 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));
-
- FileData.push_back(0); // &FileData[Size] is invalid. So is &*FileData.end().
- size_t Size = FileData.size();
- MemoryBuffer *B = new STDINBufferFile();
- B->initCopyOf(&FileData[0], &FileData[Size-1]);
- return B;
+ Buffer.reserve(Buffer.size() + ChunkSize);
+ ReadBytes = read(0, Buffer.end(), ChunkSize);
+ if (ReadBytes == -1) {
+ if (errno == EINTR) continue;
+ return error_code(errno, posix_category());
+ }
+ Buffer.set_size(Buffer.size() + ReadBytes);
+ } while (ReadBytes != 0);
+
+ result.reset(getMemBufferCopy(Buffer, "<stdin>"));
+ return success;
}
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