#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/DataTypes.h"
+#include "llvm/Support/ErrorOr.h"
+#include "llvm/Support/FileSystem.h"
namespace llvm {
-
-class error_code;
-template<class T> class OwningPtr;
-
/// FileOutputBuffer - This interface provides simple way to create an in-memory
-/// buffer which will be written to a file. During the lifetime of these
+/// buffer which will be written to a file. During the lifetime of these
/// objects, the content or existence of the specified file is undefined. That
/// is, creating an OutputBuffer for a file may immediately remove the file.
-/// If the FileOutputBuffer is committed, the target file's content will become
-/// the buffer content at the time of the commit. If the FileOutputBuffer is
+/// If the FileOutputBuffer is committed, the target file's content will become
+/// the buffer content at the time of the commit. If the FileOutputBuffer is
/// not committed, the file will be deleted in the FileOutputBuffer destructor.
class FileOutputBuffer {
public:
enum {
F_executable = 1 /// set the 'x' bit on the resulting file
- };
+ };
/// Factory method to create an OutputBuffer object which manages a read/write
/// buffer of the specified size. When committed, the buffer will be written
- /// to the file at the specified path.
- static error_code create(StringRef FilePath, size_t Size,
- OwningPtr<FileOutputBuffer> &Result,
- unsigned Flags=0);
-
+ /// to the file at the specified path.
+ static ErrorOr<std::unique_ptr<FileOutputBuffer>>
+ create(StringRef FilePath, size_t Size, unsigned Flags = 0);
/// Returns a pointer to the start of the buffer.
- uint8_t *getBufferStart() const {
- return BufferStart;
+ uint8_t *getBufferStart() {
+ return (uint8_t*)Region->data();
}
-
+
/// Returns a pointer to the end of the buffer.
- uint8_t *getBufferEnd() const {
- return BufferEnd;
+ uint8_t *getBufferEnd() {
+ return (uint8_t*)Region->data() + Region->size();
}
-
+
/// Returns size of the buffer.
size_t getBufferSize() const {
- return BufferEnd - BufferStart;
+ return Region->size();
}
-
+
/// Returns path where file will show up if buffer is committed.
StringRef getPath() const {
return FinalPath;
}
-
- /// Flushes the content of the buffer to its file and deallocates the
+
+ /// Flushes the content of the buffer to its file and deallocates the
/// buffer. If commit() is not called before this object's destructor
/// is called, the file is deleted in the destructor. The optional parameter
/// is used if it turns out you want the file size to be smaller than
/// initially requested.
- error_code commit(int64_t NewSmallerSize = -1);
-
+ std::error_code commit();
+
/// If this object was previously committed, the destructor just deletes
/// this object. If this object was not committed, the destructor
/// deallocates the buffer and the target file is never written.
~FileOutputBuffer();
-
-protected:
- FileOutputBuffer(const FileOutputBuffer &); // DO NOT IMPLEMENT
- FileOutputBuffer &operator=(const FileOutputBuffer &); // DO NOT IMPLEMENT
- FileOutputBuffer(uint8_t *Start, uint8_t *End,
- StringRef Path, StringRef TempPath);
-
- uint8_t *BufferStart;
- uint8_t *BufferEnd;
+private:
+ FileOutputBuffer(const FileOutputBuffer &) = delete;
+ FileOutputBuffer &operator=(const FileOutputBuffer &) = delete;
+
+ FileOutputBuffer(std::unique_ptr<llvm::sys::fs::mapped_file_region> R,
+ StringRef Path, StringRef TempPath);
+
+ std::unique_ptr<llvm::sys::fs::mapped_file_region> Region;
SmallString<128> FinalPath;
SmallString<128> TempPath;
};
-
-
-
} // end namespace llvm
#endif