if (Size > (size_t)(OutBufEnd - OutBufCur))
return write(Str.data(), Size);
- memcpy(OutBufCur, Str.data(), Size);
- OutBufCur += Size;
+ if (Size) {
+ memcpy(OutBufCur, Str.data(), Size);
+ OutBufCur += Size;
+ }
return *this;
}
// Formatted output, see the leftJustify() function in Support/Format.h.
raw_ostream &operator<<(const FormattedString &);
-
+
// Formatted output, see the formatHex() function in Support/Format.h.
raw_ostream &operator<<(const FormattedNumber &);
-
+
/// indent - Insert 'NumSpaces' spaces.
raw_ostream &indent(unsigned NumSpaces);
-
/// Changes the foreground color of text that will be output from this point
/// forward.
/// @param Color ANSI color to use, the special SAVEDCOLOR can be used to
/// outputting colored text, or before program exit.
virtual raw_ostream &resetColor() { return *this; }
- /// Reverses the forground and background colors.
+ /// Reverses the foreground and background colors.
virtual raw_ostream &reverseColor() { return *this; }
/// This function determines if this stream is connected to a "tty" or
void copy_to_buffer(const char *Ptr, size_t Size);
};
+/// An abstract base class for streams implementations that also support a
+/// pwrite operation. This is useful for code that can mostly stream out data,
+/// but needs to patch in a header that needs to know the output size.
+class raw_pwrite_stream : public raw_ostream {
+ virtual void pwrite_impl(const char *Ptr, size_t Size, uint64_t Offset) = 0;
+
+public:
+ explicit raw_pwrite_stream(bool Unbuffered = false)
+ : raw_ostream(Unbuffered) {}
+ void pwrite(const char *Ptr, size_t Size, uint64_t Offset) {
+#ifndef NDBEBUG
+ uint64_t Pos = tell();
+ // /dev/null always reports a pos of 0, so we cannot perform this check
+ // in that case.
+ if (Pos)
+ assert(Size + Offset <= Pos && "We don't support extending the stream");
+#endif
+ pwrite_impl(Ptr, Size, Offset);
+ }
+};
+
//===----------------------------------------------------------------------===//
// File Output Streams
//===----------------------------------------------------------------------===//
/// A raw_ostream that writes to a file descriptor.
///
-class raw_fd_ostream : public raw_ostream {
+class raw_fd_ostream : public raw_pwrite_stream {
int FD;
bool ShouldClose;
uint64_t pos;
+ bool SupportsSeeking;
+
/// See raw_ostream::write_impl.
void write_impl(const char *Ptr, size_t Size) override;
+ void pwrite_impl(const char *Ptr, size_t Size, uint64_t Offset) override;
+
/// Return the current position within the stream, not counting the bytes
/// currently in the buffer.
uint64_t current_pos() const override { return pos; }
/// this closes the file when the stream is destroyed.
raw_fd_ostream(int fd, bool shouldClose, bool unbuffered=false);
- ~raw_fd_ostream();
+ ~raw_fd_ostream() override;
/// Manually flush the stream and close the file. Note that this does not call
/// fsync.
void close();
+ bool supportsSeeking() { return SupportsSeeking; }
+
/// Flushes the stream and repositions the underlying file descriptor position
/// to the offset specified from the beginning of the file.
uint64_t seek(uint64_t off);
/// Return the current position within the stream, not counting the bytes
/// currently in the buffer.
uint64_t current_pos() const override { return OS.size(); }
+
public:
explicit raw_string_ostream(std::string &O) : OS(O) {}
- ~raw_string_ostream();
+ ~raw_string_ostream() override;
/// Flushes the stream contents to the target string and returns the string's
/// reference.
/// A raw_ostream that writes to an SmallVector or SmallString. This is a
/// simple adaptor class. This class does not encounter output errors.
-class raw_svector_ostream : public raw_ostream {
+/// raw_svector_ostream operates without a buffer, delegating all memory
+/// management to the SmallString. Thus the SmallString is always up-to-date,
+/// may be used directly and there is no need to call flush().
+class raw_svector_ostream : public raw_pwrite_stream {
SmallVectorImpl<char> &OS;
/// See raw_ostream::write_impl.
void write_impl(const char *Ptr, size_t Size) override;
- /// Return the current position within the stream, not counting the bytes
- /// currently in the buffer.
+ void pwrite_impl(const char *Ptr, size_t Size, uint64_t Offset) override;
+
+ /// Return the current position within the stream.
uint64_t current_pos() const override;
+
public:
/// Construct a new raw_svector_ostream.
///
/// \param O The vector to write to; this should generally have at least 128
/// bytes free to avoid any extraneous memory overhead.
- explicit raw_svector_ostream(SmallVectorImpl<char> &O);
- ~raw_svector_ostream();
+ explicit raw_svector_ostream(SmallVectorImpl<char> &O) : OS(O) {
+ SetUnbuffered();
+ }
+ ~raw_svector_ostream() override {}
- /// This is called when the SmallVector we're appending to is changed outside
- /// of the raw_svector_ostream's control. It is only safe to do this if the
- /// raw_svector_ostream has previously been flushed.
- void resync();
+ void flush() = delete;
- /// Flushes the stream contents to the target vector and return a StringRef
- /// for the vector contents.
- StringRef str();
+ /// Return a StringRef for the vector contents.
+ StringRef str() { return StringRef(OS.data(), OS.size()); }
};
/// A raw_ostream that discards all output.
-class raw_null_ostream : public raw_ostream {
+class raw_null_ostream : public raw_pwrite_stream {
/// See raw_ostream::write_impl.
void write_impl(const char *Ptr, size_t size) override;
+ void pwrite_impl(const char *Ptr, size_t Size, uint64_t Offset) override;
/// Return the current position within the stream, not counting the bytes
/// currently in the buffer.
public:
explicit raw_null_ostream() {}
- ~raw_null_ostream();
+ ~raw_null_ostream() override;
+};
+
+class buffer_ostream : public raw_svector_ostream {
+ raw_ostream &OS;
+ SmallVector<char, 0> Buffer;
+
+public:
+ buffer_ostream(raw_ostream &OS) : raw_svector_ostream(Buffer), OS(OS) {}
+ ~buffer_ostream() { OS << str(); }
};
} // end llvm namespace
projects / oota-llvm.git / blobdiff