#include "llvm/Support/Path.h"
#include "llvm/Support/Process.h"
#include "llvm/Support/Program.h"
+#include "llvm/Support/SmallVectorMemoryBuffer.h"
#include <cassert>
#include <cerrno>
-#include <cstdio>
#include <cstring>
#include <new>
#include <sys/types.h>
/// 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;
}
namespace {
/// MemoryBufferMem - Named MemoryBuffer pointing to a block of memory.
-class MemoryBufferMem : public MemoryBuffer {
+template<typename MB>
+class MemoryBufferMem : public MB {
public:
MemoryBufferMem(StringRef InputData, bool RequiresNullTerminator) {
- init(InputData.begin(), InputData.end(), RequiresNullTerminator);
+ MemoryBuffer::init(InputData.begin(), InputData.end(),
+ RequiresNullTerminator);
}
- const char *getBufferIdentifier() const override {
- // The name is stored after the class itself.
- return reinterpret_cast<const char*>(this + 1);
+ /// Disable sized deallocation for MemoryBufferMem, because it has
+ /// tail-allocated data.
+ void operator delete(void *p) { ::operator delete(p); }
+
+ StringRef getBufferIdentifier() const override {
+ // The name is stored after the class itself.
+ return StringRef(reinterpret_cast<const char *>(this + 1));
}
- BufferKind getBufferKind() const override {
- return MemoryBuffer_Malloc;
+ MemoryBuffer::BufferKind getBufferKind() const override {
+ return MemoryBuffer::MemoryBuffer_Malloc;
}
};
}
-/// 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))
- MemoryBufferMem(InputData, RequiresNullTerminator);
+template <typename MB>
+static ErrorOr<std::unique_ptr<MB>>
+getFileAux(const Twine &Filename, int64_t FileSize, uint64_t MapSize,
+ uint64_t Offset, bool RequiresNullTerminator, bool IsVolatile);
+
+std::unique_ptr<MemoryBuffer>
+MemoryBuffer::getMemBuffer(StringRef InputData, StringRef BufferName,
+ bool RequiresNullTerminator) {
+ auto *Ret = new (NamedBufferAlloc(BufferName))
+ MemoryBufferMem<MemoryBuffer>(InputData, RequiresNullTerminator);
+ return std::unique_ptr<MemoryBuffer>(Ret);
}
-/// 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;
- memcpy(const_cast<char*>(Buf->getBufferStart()), InputData.data(),
- InputData.size());
- return Buf;
+std::unique_ptr<MemoryBuffer>
+MemoryBuffer::getMemBuffer(MemoryBufferRef Ref, bool RequiresNullTerminator) {
+ return std::unique_ptr<MemoryBuffer>(getMemBuffer(
+ Ref.getBuffer(), Ref.getBufferIdentifier(), RequiresNullTerminator));
}
-/// 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) {
- // 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.
- size_t AlignedStringLen =
- RoundUpToAlignment(sizeof(MemoryBufferMem) + BufferName.size() + 1, 16);
- size_t RealLen = AlignedStringLen + Size + 1;
- char *Mem = static_cast<char*>(operator new(RealLen, std::nothrow));
- if (!Mem) return nullptr;
-
- // 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), true);
+static ErrorOr<std::unique_ptr<WritableMemoryBuffer>>
+getMemBufferCopyImpl(StringRef InputData, const Twine &BufferName) {
+ auto Buf = WritableMemoryBuffer::getNewUninitMemBuffer(InputData.size(), BufferName);
+ if (!Buf)
+ return make_error_code(errc::not_enough_memory);
+ memcpy(Buf->getBufferStart(), InputData.data(), InputData.size());
+ return std::move(Buf);
}
-/// getNewMemBuffer - Allocate a new zero-initialized MemoryBuffer of the
-/// specified size. Note that the caller need not 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;
- memset(const_cast<char*>(SB->getBufferStart()), 0, Size);
- return SB;
+std::unique_ptr<MemoryBuffer>
+MemoryBuffer::getMemBufferCopy(StringRef InputData, const Twine &BufferName) {
+ auto Buf = getMemBufferCopyImpl(InputData, BufferName);
+ if (Buf)
+ return std::move(*Buf);
+ return nullptr;
}
ErrorOr<std::unique_ptr<MemoryBuffer>>
-MemoryBuffer::getFileOrSTDIN(StringRef Filename, int64_t FileSize) {
- if (Filename == "-")
+MemoryBuffer::getFileOrSTDIN(const Twine &Filename, int64_t FileSize,
+ bool RequiresNullTerminator) {
+ SmallString<256> NameBuf;
+ StringRef NameRef = Filename.toStringRef(NameBuf);
+
+ if (NameRef == "-")
return getSTDIN();
- return getFile(Filename, FileSize);
+ return getFile(Filename, FileSize, RequiresNullTerminator);
}
+ErrorOr<std::unique_ptr<MemoryBuffer>>
+MemoryBuffer::getFileSlice(const Twine &FilePath, uint64_t MapSize,
+ uint64_t Offset, bool IsVolatile) {
+ return getFileAux<MemoryBuffer>(FilePath, -1, MapSize, Offset, false,
+ IsVolatile);
+}
//===----------------------------------------------------------------------===//
// MemoryBuffer::getFile implementation.
//===----------------------------------------------------------------------===//
namespace {
-/// \brief Memory maps a file descriptor using sys::fs::mapped_file_region.
+/// Memory maps a file descriptor using sys::fs::mapped_file_region.
///
/// This handles converting the offset into a legal offset on the platform.
-class MemoryBufferMMapFile : public MemoryBuffer {
+template<typename MB>
+class MemoryBufferMMapFile : public MB {
sys::fs::mapped_file_region MFR;
static uint64_t getLegalMapOffset(uint64_t Offset) {
public:
MemoryBufferMMapFile(bool RequiresNullTerminator, int FD, uint64_t Len,
- uint64_t Offset, std::error_code EC)
- : MFR(FD, false, sys::fs::mapped_file_region::readonly,
- getLegalMapSize(Len, Offset), getLegalMapOffset(Offset), EC) {
+ uint64_t Offset, std::error_code &EC)
+ : MFR(FD, MB::Mapmode, getLegalMapSize(Len, Offset),
+ getLegalMapOffset(Offset), EC) {
if (!EC) {
const char *Start = getStart(Len, Offset);
- init(Start, Start + Len, RequiresNullTerminator);
+ MemoryBuffer::init(Start, Start + Len, RequiresNullTerminator);
}
}
- const char *getBufferIdentifier() const override {
+ /// Disable sized deallocation for MemoryBufferMMapFile, because it has
+ /// tail-allocated data.
+ void operator delete(void *p) { ::operator delete(p); }
+
+ StringRef getBufferIdentifier() const override {
// The name is stored after the class itself.
- return reinterpret_cast<const char *>(this + 1);
+ return StringRef(reinterpret_cast<const char *>(this + 1));
}
- BufferKind getBufferKind() const override {
- return MemoryBuffer_MMap;
+ MemoryBuffer::BufferKind getBufferKind() const override {
+ return MemoryBuffer::MemoryBuffer_MMap;
}
};
}
-static ErrorOr<std::unique_ptr<MemoryBuffer>>
-getMemoryBufferForStream(int FD, StringRef BufferName) {
+static ErrorOr<std::unique_ptr<WritableMemoryBuffer>>
+getMemoryBufferForStream(int FD, const Twine &BufferName) {
const ssize_t ChunkSize = 4096*4;
SmallString<ChunkSize> Buffer;
ssize_t ReadBytes;
Buffer.set_size(Buffer.size() + ReadBytes);
} while (ReadBytes != 0);
- std::unique_ptr<MemoryBuffer> Ret(
- MemoryBuffer::getMemBufferCopy(Buffer, BufferName));
- return std::move(Ret);
+ return getMemBufferCopyImpl(Buffer, BufferName);
}
-static ErrorOr<std::unique_ptr<MemoryBuffer>>
-getFileAux(const char *Filename, int64_t FileSize, bool RequiresNullTerminator,
- bool IsVolatileSize);
ErrorOr<std::unique_ptr<MemoryBuffer>>
-MemoryBuffer::getFile(Twine Filename, 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(), FileSize, RequiresNullTerminator,
- IsVolatileSize);
+MemoryBuffer::getFile(const Twine &Filename, int64_t FileSize,
+ bool RequiresNullTerminator, bool IsVolatile) {
+ return getFileAux<MemoryBuffer>(Filename, FileSize, FileSize, 0,
+ RequiresNullTerminator, IsVolatile);
}
-static ErrorOr<std::unique_ptr<MemoryBuffer>>
-getOpenFileImpl(int FD, const char *Filename, uint64_t FileSize,
+template <typename MB>
+static ErrorOr<std::unique_ptr<MB>>
+getOpenFileImpl(int FD, const Twine &Filename, uint64_t FileSize,
uint64_t MapSize, int64_t Offset, bool RequiresNullTerminator,
- bool IsVolatileSize);
+ bool IsVolatile);
-static ErrorOr<std::unique_ptr<MemoryBuffer>>
-getFileAux(const char *Filename, int64_t FileSize, bool RequiresNullTerminator,
- bool IsVolatileSize) {
+template <typename MB>
+static ErrorOr<std::unique_ptr<MB>>
+getFileAux(const Twine &Filename, int64_t FileSize, uint64_t MapSize,
+ uint64_t Offset, bool RequiresNullTerminator, bool IsVolatile) {
int FD;
- std::error_code EC = sys::fs::openFileForRead(Filename, FD);
+ std::error_code EC = sys::fs::openFileForRead(Filename, FD, sys::fs::OF_None);
+
if (EC)
return EC;
- ErrorOr<std::unique_ptr<MemoryBuffer>> Ret =
- getOpenFileImpl(FD, Filename, FileSize, FileSize, 0,
- RequiresNullTerminator, IsVolatileSize);
+ auto Ret = getOpenFileImpl<MB>(FD, Filename, FileSize, MapSize, Offset,
+ RequiresNullTerminator, IsVolatile);
close(FD);
return Ret;
}
+ErrorOr<std::unique_ptr<WritableMemoryBuffer>>
+WritableMemoryBuffer::getFile(const Twine &Filename, int64_t FileSize,
+ bool IsVolatile) {
+ return getFileAux<WritableMemoryBuffer>(Filename, FileSize, FileSize, 0,
+ /*RequiresNullTerminator*/ false,
+ IsVolatile);
+}
+
+ErrorOr<std::unique_ptr<WritableMemoryBuffer>>
+WritableMemoryBuffer::getFileSlice(const Twine &Filename, uint64_t MapSize,
+ uint64_t Offset, bool IsVolatile) {
+ return getFileAux<WritableMemoryBuffer>(Filename, -1, MapSize, Offset, false,
+ IsVolatile);
+}
+
+std::unique_ptr<WritableMemoryBuffer>
+WritableMemoryBuffer::getNewUninitMemBuffer(size_t Size, const Twine &BufferName) {
+ using MemBuffer = MemoryBufferMem<WritableMemoryBuffer>;
+ // 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 = alignTo(sizeof(MemBuffer) + NameRef.size() + 1, 16);
+ size_t RealLen = AlignedStringLen + Size + 1;
+ char *Mem = static_cast<char*>(operator new(RealLen, std::nothrow));
+ if (!Mem)
+ return nullptr;
+
+ // The name is stored after the class itself.
+ CopyStringRef(Mem + sizeof(MemBuffer), NameRef);
+
+ // The buffer begins after the name and must be aligned.
+ char *Buf = Mem + AlignedStringLen;
+ Buf[Size] = 0; // Null terminate buffer.
+
+ auto *Ret = new (Mem) MemBuffer(StringRef(Buf, Size), true);
+ return std::unique_ptr<WritableMemoryBuffer>(Ret);
+}
+
+std::unique_ptr<WritableMemoryBuffer>
+WritableMemoryBuffer::getNewMemBuffer(size_t Size, const Twine &BufferName) {
+ auto SB = WritableMemoryBuffer::getNewUninitMemBuffer(Size, BufferName);
+ if (!SB)
+ return nullptr;
+ memset(SB->getBufferStart(), 0, Size);
+ return SB;
+}
+
static bool shouldUseMmap(int FD,
size_t FileSize,
size_t MapSize,
off_t Offset,
bool RequiresNullTerminator,
int PageSize,
- bool IsVolatileSize) {
+ bool IsVolatile) {
// mmap may leave the buffer without null terminator if the file size changed
// by the time the last page is mapped in, so avoid it if the file size is
// likely to change.
- if (IsVolatileSize)
+ if (IsVolatile)
return false;
// We don't use mmap for small files because this can severely fragment our
if (!RequiresNullTerminator)
return true;
-
// 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.
// FIXME: this chunk of code is duplicated, but it avoids a fstat when
return true;
}
-static ErrorOr<std::unique_ptr<MemoryBuffer>>
-getOpenFileImpl(int FD, const char *Filename, uint64_t FileSize,
+static ErrorOr<std::unique_ptr<WriteThroughMemoryBuffer>>
+getReadWriteFile(const Twine &Filename, uint64_t FileSize, uint64_t MapSize,
+ uint64_t Offset) {
+ int FD;
+ std::error_code EC = sys::fs::openFileForReadWrite(
+ Filename, FD, sys::fs::CD_OpenExisting, sys::fs::OF_None);
+
+ if (EC)
+ return EC;
+
+ // Default is to map the full file.
+ if (MapSize == uint64_t(-1)) {
+ // 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 == uint64_t(-1)) {
+ sys::fs::file_status Status;
+ std::error_code EC = sys::fs::status(FD, Status);
+ if (EC)
+ return EC;
+
+ // If this not a file or a block device (e.g. it's a named pipe
+ // or character device), we can't mmap it, so error out.
+ sys::fs::file_type Type = Status.type();
+ if (Type != sys::fs::file_type::regular_file &&
+ Type != sys::fs::file_type::block_file)
+ return make_error_code(errc::invalid_argument);
+
+ FileSize = Status.getSize();
+ }
+ MapSize = FileSize;
+ }
+
+ std::unique_ptr<WriteThroughMemoryBuffer> Result(
+ new (NamedBufferAlloc(Filename))
+ MemoryBufferMMapFile<WriteThroughMemoryBuffer>(false, FD, MapSize,
+ Offset, EC));
+ if (EC)
+ return EC;
+ return std::move(Result);
+}
+
+ErrorOr<std::unique_ptr<WriteThroughMemoryBuffer>>
+WriteThroughMemoryBuffer::getFile(const Twine &Filename, int64_t FileSize) {
+ return getReadWriteFile(Filename, FileSize, FileSize, 0);
+}
+
+/// Map a subrange of the specified file as a WritableMemoryBuffer.
+ErrorOr<std::unique_ptr<WriteThroughMemoryBuffer>>
+WriteThroughMemoryBuffer::getFileSlice(const Twine &Filename, uint64_t MapSize,
+ uint64_t Offset) {
+ return getReadWriteFile(Filename, -1, MapSize, Offset);
+}
+
+template <typename MB>
+static ErrorOr<std::unique_ptr<MB>>
+getOpenFileImpl(int FD, const Twine &Filename, uint64_t FileSize,
uint64_t MapSize, int64_t Offset, bool RequiresNullTerminator,
- bool IsVolatileSize) {
- static int PageSize = sys::process::get_self()->page_size();
+ bool IsVolatile) {
+ static int PageSize = sys::Process::getPageSize();
// Default is to map the full file.
if (MapSize == uint64_t(-1)) {
}
if (shouldUseMmap(FD, FileSize, MapSize, Offset, RequiresNullTerminator,
- PageSize, IsVolatileSize)) {
+ PageSize, IsVolatile)) {
std::error_code EC;
- std::unique_ptr<MemoryBuffer> Result(
- new (NamedBufferAlloc(Filename))
- MemoryBufferMMapFile(RequiresNullTerminator, FD, MapSize, Offset, EC));
+ std::unique_ptr<MB> Result(
+ new (NamedBufferAlloc(Filename)) MemoryBufferMMapFile<MB>(
+ RequiresNullTerminator, FD, MapSize, Offset, EC));
if (!EC)
return std::move(Result);
}
- MemoryBuffer *Buf = MemoryBuffer::getNewUninitMemBuffer(MapSize, Filename);
+ auto Buf = WritableMemoryBuffer::getNewUninitMemBuffer(MapSize, Filename);
if (!Buf) {
// 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);
}
- std::unique_ptr<MemoryBuffer> SB(Buf);
- char *BufPtr = const_cast<char*>(SB->getBufferStart());
+ char *BufPtr = Buf.get()->getBufferStart();
size_t BytesLeft = MapSize;
#ifndef HAVE_PREAD
BufPtr += NumRead;
}
- return std::move(SB);
+ return std::move(Buf);
}
ErrorOr<std::unique_ptr<MemoryBuffer>>
-MemoryBuffer::getOpenFile(int FD, const char *Filename, uint64_t FileSize,
- bool RequiresNullTerminator, bool IsVolatileSize) {
- return getOpenFileImpl(FD, Filename, FileSize, FileSize, 0,
- RequiresNullTerminator, IsVolatileSize);
+MemoryBuffer::getOpenFile(int FD, const Twine &Filename, uint64_t FileSize,
+ bool RequiresNullTerminator, bool IsVolatile) {
+ return getOpenFileImpl<MemoryBuffer>(FD, Filename, FileSize, FileSize, 0,
+ RequiresNullTerminator, IsVolatile);
}
ErrorOr<std::unique_ptr<MemoryBuffer>>
-MemoryBuffer::getOpenFileSlice(int FD, const char *Filename, uint64_t MapSize,
- int64_t Offset, bool IsVolatileSize) {
- return getOpenFileImpl(FD, Filename, -1, MapSize, Offset, false,
- IsVolatileSize);
+MemoryBuffer::getOpenFileSlice(int FD, const Twine &Filename, uint64_t MapSize,
+ int64_t Offset, bool IsVolatile) {
+ assert(MapSize != uint64_t(-1));
+ return getOpenFileImpl<MemoryBuffer>(FD, Filename, -1, MapSize, Offset, false,
+ IsVolatile);
}
ErrorOr<std::unique_ptr<MemoryBuffer>> MemoryBuffer::getSTDIN() {
return getMemoryBufferForStream(0, "<stdin>");
}
+
+ErrorOr<std::unique_ptr<MemoryBuffer>>
+MemoryBuffer::getFileAsStream(const Twine &Filename) {
+ int FD;
+ std::error_code EC = sys::fs::openFileForRead(Filename, FD, sys::fs::OF_None);
+ if (EC)
+ return EC;
+ ErrorOr<std::unique_ptr<MemoryBuffer>> Ret =
+ getMemoryBufferForStream(FD, Filename);
+ close(FD);
+ return Ret;
+}
+
+MemoryBufferRef MemoryBuffer::getMemBufferRef() const {
+ StringRef Data = getBuffer();
+ StringRef Identifier = getBufferIdentifier();
+ return MemoryBufferRef(Data, Identifier);
+}
+
+void MemoryBuffer::anchor() {}
+void SmallVectorMemoryBuffer::anchor() {}
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