#include "llvm/Support/MemoryBuffer.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/Config/config.h"
+#include "llvm/Support/Errc.h"
#include "llvm/Support/Errno.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/Program.h"
#include <cassert>
#include <cerrno>
-#include <cstdio>
#include <cstring>
#include <new>
#include <sys/types.h>
#include <io.h>
#endif
using namespace llvm;
-using std::error_code;
//===----------------------------------------------------------------------===//
// MemoryBuffer implementation itself.
/// 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());
+ if (!Data.empty())
+ memcpy(Memory, Data.data(), Data.size());
Memory[Data.size()] = 0; // Null terminate string.
}
namespace {
struct NamedBufferAlloc {
- StringRef Name;
- NamedBufferAlloc(StringRef Name) : Name(Name) {}
+ const Twine &Name;
+ NamedBufferAlloc(const Twine &Name) : Name(Name) {}
};
}
void *operator new(size_t N, const NamedBufferAlloc &Alloc) {
- char *Mem = static_cast<char *>(operator new(N + Alloc.Name.size() + 1));
- CopyStringRef(Mem + N, Alloc.Name);
+ SmallString<256> NameBuf;
+ StringRef NameRef = Alloc.Name.toStringRef(NameBuf);
+
+ char *Mem = static_cast<char *>(operator new(N + NameRef.size() + 1));
+ CopyStringRef(Mem + N, NameRef);
return Mem;
}
};
}
-/// getMemBuffer - Open the specified memory range as a MemoryBuffer. Note
-/// that InputData must be a null terminated if RequiresNullTerminator is true!
-MemoryBuffer *MemoryBuffer::getMemBuffer(StringRef InputData,
- StringRef BufferName,
- bool RequiresNullTerminator) {
- return new (NamedBufferAlloc(BufferName))
+static ErrorOr<std::unique_ptr<MemoryBuffer>>
+getFileAux(const Twine &Filename, int64_t FileSize, uint64_t MapSize,
+ uint64_t Offset, bool RequiresNullTerminator, bool IsVolatileSize);
+
+std::unique_ptr<MemoryBuffer>
+MemoryBuffer::getMemBuffer(StringRef InputData, StringRef BufferName,
+ bool RequiresNullTerminator) {
+ auto *Ret = new (NamedBufferAlloc(BufferName))
MemoryBufferMem(InputData, RequiresNullTerminator);
+ return std::unique_ptr<MemoryBuffer>(Ret);
+}
+
+std::unique_ptr<MemoryBuffer>
+MemoryBuffer::getMemBuffer(MemoryBufferRef Ref, bool RequiresNullTerminator) {
+ return std::unique_ptr<MemoryBuffer>(getMemBuffer(
+ Ref.getBuffer(), Ref.getBufferIdentifier(), RequiresNullTerminator));
}
-/// 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,
- StringRef BufferName) {
- MemoryBuffer *Buf = getNewUninitMemBuffer(InputData.size(), BufferName);
- if (!Buf) return nullptr;
+std::unique_ptr<MemoryBuffer>
+MemoryBuffer::getMemBufferCopy(StringRef InputData, const Twine &BufferName) {
+ std::unique_ptr<MemoryBuffer> Buf =
+ getNewUninitMemBuffer(InputData.size(), BufferName);
+ if (!Buf)
+ return nullptr;
memcpy(const_cast<char*>(Buf->getBufferStart()), InputData.data(),
InputData.size());
return Buf;
}
-/// getNewUninitMemBuffer - Allocate a new MemoryBuffer of the specified size
-/// 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) {
+std::unique_ptr<MemoryBuffer>
+MemoryBuffer::getNewUninitMemBuffer(size_t Size, const Twine &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.
// TODO: Is 16-byte alignment enough? We copy small object files with large
// alignment expectations into this buffer.
+ SmallString<256> NameBuf;
+ StringRef NameRef = BufferName.toStringRef(NameBuf);
size_t AlignedStringLen =
- RoundUpToAlignment(sizeof(MemoryBufferMem) + BufferName.size() + 1, 16);
+ RoundUpToAlignment(sizeof(MemoryBufferMem) + NameRef.size() + 1, 16);
size_t RealLen = AlignedStringLen + Size + 1;
char *Mem = static_cast<char*>(operator new(RealLen, std::nothrow));
- if (!Mem) return nullptr;
+ if (!Mem)
+ return nullptr;
// The name is stored after the class itself.
- CopyStringRef(Mem + sizeof(MemoryBufferMem), BufferName);
+ CopyStringRef(Mem + sizeof(MemoryBufferMem), NameRef);
// 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), true);
+ auto *Ret = new (Mem) MemoryBufferMem(StringRef(Buf, Size), true);
+ return std::unique_ptr<MemoryBuffer>(Ret);
}
-/// 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, StringRef BufferName) {
- MemoryBuffer *SB = getNewUninitMemBuffer(Size, BufferName);
- if (!SB) return nullptr;
+std::unique_ptr<MemoryBuffer>
+MemoryBuffer::getNewMemBuffer(size_t Size, StringRef BufferName) {
+ std::unique_ptr<MemoryBuffer> SB = getNewUninitMemBuffer(Size, BufferName);
+ if (!SB)
+ return nullptr;
memset(const_cast<char*>(SB->getBufferStart()), 0, Size);
return SB;
}
+ErrorOr<std::unique_ptr<MemoryBuffer>>
+MemoryBuffer::getFileOrSTDIN(const Twine &Filename, int64_t FileSize,
+ bool RequiresNullTerminator) {
+ SmallString<256> NameBuf;
+ StringRef NameRef = Filename.toStringRef(NameBuf);
-/// getFileOrSTDIN - Open the specified file as a MemoryBuffer, or open stdin
-/// 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.
-error_code MemoryBuffer::getFileOrSTDIN(StringRef Filename,
- std::unique_ptr<MemoryBuffer> &Result,
- int64_t FileSize) {
- if (Filename == "-")
- return getSTDIN(Result);
- return getFile(Filename, Result, FileSize);
+ if (NameRef == "-")
+ return getSTDIN();
+ return getFile(Filename, FileSize, RequiresNullTerminator);
+}
+
+ErrorOr<std::unique_ptr<MemoryBuffer>>
+MemoryBuffer::getFileSlice(const Twine &FilePath, uint64_t MapSize,
+ uint64_t Offset) {
+ return getFileAux(FilePath, -1, MapSize, Offset, false, false);
}
public:
MemoryBufferMMapFile(bool RequiresNullTerminator, int FD, uint64_t Len,
- uint64_t Offset, error_code EC)
- : MFR(FD, false, sys::fs::mapped_file_region::readonly,
+ uint64_t Offset, std::error_code &EC)
+ : MFR(FD, sys::fs::mapped_file_region::readonly,
getLegalMapSize(Len, Offset), getLegalMapOffset(Offset), EC) {
if (!EC) {
const char *Start = getStart(Len, Offset);
};
}
-static error_code getMemoryBufferForStream(int FD,
- StringRef BufferName,
- std::unique_ptr<MemoryBuffer> &Result) {
+static ErrorOr<std::unique_ptr<MemoryBuffer>>
+getMemoryBufferForStream(int FD, const Twine &BufferName) {
const ssize_t ChunkSize = 4096*4;
SmallString<ChunkSize> Buffer;
ssize_t ReadBytes;
ReadBytes = read(FD, Buffer.end(), ChunkSize);
if (ReadBytes == -1) {
if (errno == EINTR) continue;
- return error_code(errno, std::generic_category());
+ return std::error_code(errno, std::generic_category());
}
Buffer.set_size(Buffer.size() + ReadBytes);
} while (ReadBytes != 0);
- Result.reset(MemoryBuffer::getMemBufferCopy(Buffer, BufferName));
- return error_code();
+ return MemoryBuffer::getMemBufferCopy(Buffer, BufferName);
}
-static error_code getFileAux(const char *Filename,
- std::unique_ptr<MemoryBuffer> &Result,
- int64_t FileSize,
- bool RequiresNullTerminator,
- bool IsVolatileSize);
-
-error_code MemoryBuffer::getFile(Twine Filename,
- std::unique_ptr<MemoryBuffer> &Result,
- int64_t FileSize,
- bool RequiresNullTerminator,
- bool IsVolatileSize) {
- // Ensure the path is null terminated.
- SmallString<256> PathBuf;
- StringRef NullTerminatedName = Filename.toNullTerminatedStringRef(PathBuf);
- return getFileAux(NullTerminatedName.data(), Result, FileSize,
+
+ErrorOr<std::unique_ptr<MemoryBuffer>>
+MemoryBuffer::getFile(const Twine &Filename, int64_t FileSize,
+ bool RequiresNullTerminator, bool IsVolatileSize) {
+ return getFileAux(Filename, FileSize, FileSize, 0,
RequiresNullTerminator, IsVolatileSize);
}
-static error_code getOpenFileImpl(int FD, const char *Filename,
- std::unique_ptr<MemoryBuffer> &Result,
- uint64_t FileSize, uint64_t MapSize,
- int64_t Offset, bool RequiresNullTerminator,
- bool IsVolatileSize);
+static ErrorOr<std::unique_ptr<MemoryBuffer>>
+getOpenFileImpl(int FD, const Twine &Filename, uint64_t FileSize,
+ uint64_t MapSize, int64_t Offset, bool RequiresNullTerminator,
+ bool IsVolatileSize);
-static error_code getFileAux(const char *Filename,
- std::unique_ptr<MemoryBuffer> &Result, int64_t FileSize,
- bool RequiresNullTerminator,
- bool IsVolatileSize) {
+static ErrorOr<std::unique_ptr<MemoryBuffer>>
+getFileAux(const Twine &Filename, int64_t FileSize, uint64_t MapSize,
+ uint64_t Offset, bool RequiresNullTerminator, bool IsVolatileSize) {
int FD;
- error_code EC = sys::fs::openFileForRead(Filename, FD);
+ std::error_code EC = sys::fs::openFileForRead(Filename, FD);
if (EC)
return EC;
- error_code ret = getOpenFileImpl(FD, Filename, Result, FileSize, FileSize, 0,
- RequiresNullTerminator, IsVolatileSize);
+ ErrorOr<std::unique_ptr<MemoryBuffer>> Ret =
+ getOpenFileImpl(FD, Filename, FileSize, MapSize, Offset,
+ RequiresNullTerminator, IsVolatileSize);
close(FD);
- return ret;
+ return Ret;
}
static bool shouldUseMmap(int FD,
if ((FileSize & (PageSize -1)) == 0)
return false;
+#if defined(__CYGWIN__)
+ // Don't try to map files that are exactly a multiple of the physical page size
+ // if we need a null terminator.
+ // FIXME: We should reorganize again getPageSize() on Win32.
+ if ((FileSize & (4096 - 1)) == 0)
+ return false;
+#endif
+
return true;
}
-static error_code getOpenFileImpl(int FD, const char *Filename,
- std::unique_ptr<MemoryBuffer> &Result,
- uint64_t FileSize, uint64_t MapSize,
- int64_t Offset, bool RequiresNullTerminator,
- bool IsVolatileSize) {
- static int PageSize = sys::process::get_self()->page_size();
+static ErrorOr<std::unique_ptr<MemoryBuffer>>
+getOpenFileImpl(int FD, const Twine &Filename, uint64_t FileSize,
+ uint64_t MapSize, int64_t Offset, bool RequiresNullTerminator,
+ bool IsVolatileSize) {
+ static int PageSize = sys::Process::getPageSize();
// Default is to map the full file.
if (MapSize == uint64_t(-1)) {
// file descriptor is cheaper than stat on a random path.
if (FileSize == uint64_t(-1)) {
sys::fs::file_status Status;
- error_code EC = sys::fs::status(FD, Status);
+ std::error_code EC = sys::fs::status(FD, Status);
if (EC)
return EC;
sys::fs::file_type Type = Status.type();
if (Type != sys::fs::file_type::regular_file &&
Type != sys::fs::file_type::block_file)
- return getMemoryBufferForStream(FD, Filename, Result);
+ return getMemoryBufferForStream(FD, Filename);
FileSize = Status.getSize();
}
if (shouldUseMmap(FD, FileSize, MapSize, Offset, RequiresNullTerminator,
PageSize, IsVolatileSize)) {
- error_code EC;
- Result.reset(new (NamedBufferAlloc(Filename)) MemoryBufferMMapFile(
- RequiresNullTerminator, FD, MapSize, Offset, EC));
+ std::error_code EC;
+ std::unique_ptr<MemoryBuffer> Result(
+ new (NamedBufferAlloc(Filename))
+ MemoryBufferMMapFile(RequiresNullTerminator, FD, MapSize, Offset, EC));
if (!EC)
- return error_code();
+ return std::move(Result);
}
- MemoryBuffer *Buf = MemoryBuffer::getNewUninitMemBuffer(MapSize, Filename);
+ std::unique_ptr<MemoryBuffer> Buf =
+ MemoryBuffer::getNewUninitMemBuffer(MapSize, Filename);
if (!Buf) {
// Failed to create a buffer. The only way it can fail is if
// new(std::nothrow) returns 0.
- return std::make_error_code(std::errc::not_enough_memory);
+ return make_error_code(errc::not_enough_memory);
}
- std::unique_ptr<MemoryBuffer> SB(Buf);
- char *BufPtr = const_cast<char*>(SB->getBufferStart());
+ char *BufPtr = const_cast<char *>(Buf->getBufferStart());
size_t BytesLeft = MapSize;
#ifndef HAVE_PREAD
if (lseek(FD, Offset, SEEK_SET) == -1)
- return error_code(errno, std::generic_category());
+ return std::error_code(errno, std::generic_category());
#endif
while (BytesLeft) {
if (errno == EINTR)
continue;
// Error while reading.
- return error_code(errno, std::generic_category());
+ return std::error_code(errno, std::generic_category());
}
if (NumRead == 0) {
memset(BufPtr, 0, BytesLeft); // zero-initialize rest of the buffer.
BufPtr += NumRead;
}
- Result.swap(SB);
- return error_code();
+ return std::move(Buf);
}
-error_code MemoryBuffer::getOpenFile(int FD, const char *Filename,
- std::unique_ptr<MemoryBuffer> &Result,
- uint64_t FileSize,
- bool RequiresNullTerminator,
- bool IsVolatileSize) {
- return getOpenFileImpl(FD, Filename, Result, FileSize, FileSize, 0,
+ErrorOr<std::unique_ptr<MemoryBuffer>>
+MemoryBuffer::getOpenFile(int FD, const Twine &Filename, uint64_t FileSize,
+ bool RequiresNullTerminator, bool IsVolatileSize) {
+ return getOpenFileImpl(FD, Filename, FileSize, FileSize, 0,
RequiresNullTerminator, IsVolatileSize);
}
-error_code MemoryBuffer::getOpenFileSlice(int FD, const char *Filename,
- std::unique_ptr<MemoryBuffer> &Result,
- uint64_t MapSize, int64_t Offset,
- bool IsVolatileSize) {
- return getOpenFileImpl(FD, Filename, Result, -1, MapSize, Offset, false,
- IsVolatileSize);
+ErrorOr<std::unique_ptr<MemoryBuffer>>
+MemoryBuffer::getOpenFileSlice(int FD, const Twine &Filename, uint64_t MapSize,
+ int64_t Offset) {
+ assert(MapSize != uint64_t(-1));
+ return getOpenFileImpl(FD, Filename, -1, MapSize, Offset, false,
+ /*IsVolatileSize*/ false);
}
-//===----------------------------------------------------------------------===//
-// MemoryBuffer::getSTDIN implementation.
-//===----------------------------------------------------------------------===//
-
-error_code MemoryBuffer::getSTDIN(std::unique_ptr<MemoryBuffer> &Result) {
+ErrorOr<std::unique_ptr<MemoryBuffer>> MemoryBuffer::getSTDIN() {
// 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::ChangeStdinToBinary();
- return getMemoryBufferForStream(0, "<stdin>", Result);
+ return getMemoryBufferForStream(0, "<stdin>");
+}
+
+MemoryBufferRef MemoryBuffer::getMemBufferRef() const {
+ StringRef Data = getBuffer();
+ StringRef Identifier = getBufferIdentifier();
+ return MemoryBufferRef(Data, Identifier);
}
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