-//===--- raw_ostream.h - Raw output stream --------------------------------===//
+//===--- raw_ostream.h - Raw output stream ----------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
namespace llvm {
class format_object_base;
-
+ template <typename T>
+ class SmallVectorImpl;
+
/// raw_ostream - This class implements an extremely fast bulk output stream
/// that can *only* output to a stream. It does not support seeking, reopening,
/// rewinding, line buffered disciplines etc. It is a simple buffer that outputs
/// a chunk at a time.
class raw_ostream {
-protected:
+private:
+ /// The buffer is handled in such a way that the buffer is
+ /// uninitialized, unbuffered, or out of space when OutBufCur >=
+ /// OutBufEnd. Thus a single comparison suffices to determine if we
+ /// need to take the slow path to write a single character.
+ ///
+ /// The buffer is in one of three states:
+ /// 1. Unbuffered (Unbuffered == true)
+ /// 1. Uninitialized (Unbuffered == false && OutBufStart == 0).
+ /// 2. Buffered (Unbuffered == false && OutBufStart != 0 &&
+ /// OutBufEnd - OutBufStart >= 64).
char *OutBufStart, *OutBufEnd, *OutBufCur;
+ bool Unbuffered;
+
public:
- raw_ostream() {
+ // color order matches ANSI escape sequence, don't change
+ enum Colors {
+ BLACK=0,
+ RED,
+ GREEN,
+ YELLOW,
+ BLUE,
+ MAGENTA,
+ CYAN,
+ WHITE,
+ SAVEDCOLOR
+ };
+
+ explicit raw_ostream(bool unbuffered=false) : Unbuffered(unbuffered) {
// Start out ready to flush.
OutBufStart = OutBufEnd = OutBufCur = 0;
}
- virtual ~raw_ostream() {}
-
+
+ virtual ~raw_ostream() {
+ delete [] OutBufStart;
+ }
+
+ /// tell - Return the current offset with the file.
+ uint64_t tell() { return current_pos() + GetNumBytesInBuffer(); }
+
//===--------------------------------------------------------------------===//
// Configuration Interface
//===--------------------------------------------------------------------===//
-
+
/// SetBufferSize - Set the internal buffer size to the specified amount
/// instead of the default.
- void SetBufferSize(unsigned Size) {
+ void SetBufferSize(unsigned Size=4096) {
assert(Size >= 64 &&
"Buffer size must be somewhat large for invariants to hold");
flush();
-
+
delete [] OutBufStart;
OutBufStart = new char[Size];
OutBufEnd = OutBufStart+Size;
OutBufCur = OutBufStart;
+ Unbuffered = false;
}
-
+
+ /// SetUnbuffered - Set the streams buffering status. When
+ /// unbuffered the stream will flush after every write. This routine
+ /// will also flush the buffer immediately when the stream is being
+ /// set to unbuffered.
+ void SetUnbuffered() {
+ flush();
+
+ delete [] OutBufStart;
+ OutBufStart = OutBufEnd = OutBufCur = 0;
+ Unbuffered = true;
+ }
+
+ unsigned GetNumBytesInBuffer() const {
+ return OutBufCur - OutBufStart;
+ }
+
//===--------------------------------------------------------------------===//
// Data Output Interface
//===--------------------------------------------------------------------===//
-
+
void flush() {
if (OutBufCur != OutBufStart)
- flush_impl();
+ flush_nonempty();
}
-
+
raw_ostream &operator<<(char C) {
if (OutBufCur >= OutBufEnd)
- flush_impl();
+ return write(C);
*OutBufCur++ = C;
return *this;
}
-
+
raw_ostream &operator<<(unsigned char C) {
if (OutBufCur >= OutBufEnd)
- flush_impl();
+ return write(C);
*OutBufCur++ = C;
return *this;
}
-
+
raw_ostream &operator<<(signed char C) {
if (OutBufCur >= OutBufEnd)
- flush_impl();
+ return write(C);
*OutBufCur++ = C;
return *this;
}
-
+
raw_ostream &operator<<(const char *Str) {
- return write(Str, strlen(Str));
+ // Inline fast path, particulary for constant strings where a
+ // sufficiently smart compiler will simplify strlen.
+
+ unsigned Size = strlen(Str);
+
+ // Make sure we can use the fast path.
+ if (OutBufCur+Size > OutBufEnd)
+ return write(Str, Size);
+
+ memcpy(OutBufCur, Str, Size);
+ OutBufCur += Size;
+ return *this;
}
-
+
raw_ostream &operator<<(const std::string& Str) {
- return write(Str.data(), Str.length());
+ write(Str.data(), Str.length());
+ return *this;
}
-
+
raw_ostream &operator<<(unsigned long N);
raw_ostream &operator<<(long N);
raw_ostream &operator<<(unsigned long long N);
raw_ostream &operator<<(long long N);
-
+ raw_ostream &operator<<(const void *P);
raw_ostream &operator<<(unsigned int N) {
- return this->operator<<(static_cast<unsigned long>(N));
+ this->operator<<(static_cast<unsigned long>(N));
+ return *this;
}
-
+
raw_ostream &operator<<(int N) {
- return this->operator<<(static_cast<long>(N));
+ this->operator<<(static_cast<long>(N));
+ return *this;
}
raw_ostream &operator<<(double N) {
- return this->operator<<(ftostr(N));
+ this->operator<<(ftostr(N));
+ return *this;
}
-
+
+ raw_ostream &write(unsigned char C);
raw_ostream &write(const char *Ptr, unsigned Size);
-
- // Formatted output, see the format() function below.
+
+ // Formatted output, see the format() function in Support/Format.h.
raw_ostream &operator<<(const format_object_base &Fmt);
-
+
+ /// Changes the foreground color of text that will be output from this point
+ /// forward.
+ /// @param colors ANSI color to use, the special SAVEDCOLOR can be used to
+ /// change only the bold attribute, and keep colors untouched
+ /// @param bold bold/brighter text, default false
+ /// @param bg if true change the background, default: change foreground
+ /// @returns itself so it can be used within << invocations
+ virtual raw_ostream &changeColor(enum Colors colors, bool bold=false,
+ bool bg=false) { return *this; }
+
+ /// Resets the colors to terminal defaults. Call this when you are done
+ /// outputting colored text, or before program exit.
+ virtual raw_ostream &resetColor() { return *this; }
+
//===--------------------------------------------------------------------===//
// Subclass Interface
//===--------------------------------------------------------------------===//
-protected:
-
- /// flush_impl - The is the piece of the class that is implemented by
- /// subclasses. This outputs the currently buffered data and resets the
- /// buffer to empty.
- virtual void flush_impl() = 0;
-
- /// HandleFlush - A stream's implementation of flush should call this after
- /// emitting the bytes to the data sink.
- void HandleFlush() {
- if (OutBufStart == 0)
- SetBufferSize(4096);
- OutBufCur = OutBufStart;
- }
private:
+ /// write_impl - The is the piece of the class that is implemented
+ /// by subclasses. This writes the \args Size bytes starting at
+ /// \arg Ptr to the underlying stream.
+ ///
+ /// \invariant { Size > 0 }
+ virtual void write_impl(const char *Ptr, unsigned Size) = 0;
+
// An out of line virtual method to provide a home for the class vtable.
virtual void handle();
-};
-
-//===----------------------------------------------------------------------===//
-// Formatted Output
-//===----------------------------------------------------------------------===//
-/// format_object_base - This is a helper class used for handling formatted
-/// output. It is the abstract base class of a templated derived class.
-class format_object_base {
-protected:
- const char *Fmt;
- virtual void home(); // Out of line virtual method.
-public:
- format_object_base(const char *fmt) : Fmt(fmt) {}
- virtual ~format_object_base() {}
-
- /// print - Format the object into the specified buffer. On success, this
- /// returns the length of the formatted string. If the buffer is too small,
- /// this returns a length to retry with, which will be larger than BufferSize.
- virtual unsigned print(char *Buffer, unsigned BufferSize) const = 0;
-};
-
-/// format_object - This is a templated helper class used by the format function
-/// that captures the object to be formated and the format string. When
-/// actually printed, this synthesizes the string into a temporary buffer
-/// provided and returns whether or not it is big enough.
-template <typename T>
- class format_object : public format_object_base {
- T Val;
-public:
- format_object(const char *fmt, const T &val)
- : format_object_base(fmt), Val(val) {
- }
-
- /// print - Format the object into the specified buffer. On success, this
- /// returns the length of the formatted string. If the buffer is too small,
- /// this returns a length to retry with, which will be larger than BufferSize.
- virtual unsigned print(char *Buffer, unsigned BufferSize) const {
- int N = snprintf(Buffer, BufferSize-1, Fmt, Val);
- if (N < 0) // VC++ and old GlibC return negative on overflow.
- return BufferSize*2;
- if (unsigned(N) >= BufferSize-1)// Other impls yield number of bytes needed.
- return N+1;
- // If N is positive and <= BufferSize-1, then the string fit, yay.
- return N;
- }
+ /// current_pos - Return the current position within the stream, not
+ /// counting the bytes currently in the buffer.
+ virtual uint64_t current_pos() = 0;
+
+ //===--------------------------------------------------------------------===//
+ // Private Interface
+ //===--------------------------------------------------------------------===//
+private:
+ /// flush_nonempty - Flush the current buffer, which is known to be
+ /// non-empty. This outputs the currently buffered data and resets
+ /// the buffer to empty.
+ void flush_nonempty();
};
-/// format - This is a helper function that is used to produce formatted output.
-/// This is typically used like: OS << format("%0.4f", myfloat) << '\n';
-template <typename T>
-inline format_object<T> format(const char *Fmt, const T &Val) {
- return format_object<T>(Fmt, Val);
-}
-
//===----------------------------------------------------------------------===//
// File Output Streams
//===----------------------------------------------------------------------===//
-
+
/// raw_fd_ostream - A raw_ostream that writes to a file descriptor.
///
class raw_fd_ostream : public raw_ostream {
int FD;
bool ShouldClose;
+ uint64_t pos;
+
+ /// write_impl - See raw_ostream::write_impl.
+ virtual void write_impl(const char *Ptr, unsigned Size);
+
+ /// current_pos - Return the current position within the stream, not
+ /// counting the bytes currently in the buffer.
+ virtual uint64_t current_pos() { return pos; }
+
public:
- /// raw_fd_ostream - Open the specified file for writing. If an error occurs,
- /// information about the error is put into ErrorInfo, and the stream should
- /// be immediately destroyed.
- raw_fd_ostream(const char *Filename, std::string &ErrorInfo);
-
+ /// raw_fd_ostream - Open the specified file for writing. If an
+ /// error occurs, information about the error is put into ErrorInfo,
+ /// and the stream should be immediately destroyed; the string will
+ /// be empty if no error occurred.
+ ///
+ /// \param Filename - The file to open. If this is "-" then the
+ /// stream will use stdout instead.
+ /// \param Binary - The file should be opened in binary mode on
+ /// platforms that support this distinction.
+ raw_fd_ostream(const char *Filename, bool Binary, std::string &ErrorInfo);
+
/// raw_fd_ostream ctor - FD is the file descriptor that this writes to. If
- /// ShouldClose is true, this closes the file when
- raw_fd_ostream(int fd, bool shouldClose) : FD(fd), ShouldClose(shouldClose) {}
+ /// ShouldClose is true, this closes the file when the stream is destroyed.
+ raw_fd_ostream(int fd, bool shouldClose,
+ bool unbuffered=false) : raw_ostream(unbuffered), FD(fd),
+ ShouldClose(shouldClose) {}
~raw_fd_ostream();
-
- /// flush_impl - The is the piece of the class that is implemented by
- /// subclasses. This outputs the currently buffered data and resets the
- /// buffer to empty.
- virtual void flush_impl();
+
+ /// close - Manually flush the stream and close the file.
+ void close();
+
+ /// tell - Return the current offset with the file.
+ uint64_t tell() { return pos + GetNumBytesInBuffer(); }
+
+ /// seek - Flushes the stream and repositions the underlying file descriptor
+ /// positition to the offset specified from the beginning of the file.
+ uint64_t seek(uint64_t off);
+
+ virtual raw_ostream &changeColor(enum Colors colors, bool bold=false,
+ bool bg=false);
+ virtual raw_ostream &resetColor();
};
-
+
/// raw_stdout_ostream - This is a stream that always prints to stdout.
///
class raw_stdout_ostream : public raw_fd_ostream {
public:
raw_stderr_ostream();
};
-
+
/// outs() - This returns a reference to a raw_ostream for standard output.
/// Use it like: outs() << "foo" << "bar";
raw_ostream &outs();
/// errs() - This returns a reference to a raw_ostream for standard error.
/// Use it like: errs() << "foo" << "bar";
raw_ostream &errs();
-
-
+
+
//===----------------------------------------------------------------------===//
-// Bridge Output Streams
+// Output Stream Adaptors
//===----------------------------------------------------------------------===//
-
+
/// raw_os_ostream - A raw_ostream that writes to an std::ostream. This is a
/// simple adaptor class.
class raw_os_ostream : public raw_ostream {
std::ostream &OS;
+
+ /// write_impl - See raw_ostream::write_impl.
+ virtual void write_impl(const char *Ptr, unsigned Size);
+
+ /// current_pos - Return the current position within the stream, not
+ /// counting the bytes currently in the buffer.
+ virtual uint64_t current_pos();
+
public:
raw_os_ostream(std::ostream &O) : OS(O) {}
-
- /// flush_impl - The is the piece of the class that is implemented by
- /// subclasses. This outputs the currently buffered data and resets the
- /// buffer to empty.
- virtual void flush_impl();
+ ~raw_os_ostream();
+
+ /// tell - Return the current offset with the stream.
+ uint64_t tell();
};
-
+
+/// raw_string_ostream - A raw_ostream that writes to an std::string. This is a
+/// simple adaptor class.
+class raw_string_ostream : public raw_ostream {
+ std::string &OS;
+
+ /// write_impl - See raw_ostream::write_impl.
+ virtual void write_impl(const char *Ptr, unsigned Size);
+
+ /// current_pos - Return the current position within the stream, not
+ /// counting the bytes currently in the buffer.
+ virtual uint64_t current_pos() { return OS.size(); }
+public:
+ raw_string_ostream(std::string &O) : OS(O) {}
+ ~raw_string_ostream();
+
+ /// tell - Return the current offset with the stream.
+ uint64_t tell() { return OS.size() + GetNumBytesInBuffer(); }
+
+ /// str - Flushes the stream contents to the target string and returns
+ /// the string's reference.
+ std::string& str() {
+ flush();
+ return OS;
+ }
+};
+
+/// raw_svector_ostream - A raw_ostream that writes to an SmallVector or
+/// SmallString. This is a simple adaptor class.
+class raw_svector_ostream : public raw_ostream {
+ SmallVectorImpl<char> &OS;
+
+ /// write_impl - See raw_ostream::write_impl.
+ virtual void write_impl(const char *Ptr, unsigned Size);
+
+ /// current_pos - Return the current position within the stream, not
+ /// counting the bytes currently in the buffer.
+ virtual uint64_t current_pos();
+public:
+ raw_svector_ostream(SmallVectorImpl<char> &O) : OS(O) {}
+ ~raw_svector_ostream();
+
+ /// tell - Return the current offset with the stream.
+ uint64_t tell();
+};
+
} // end llvm namespace
#endif
projects / oota-llvm.git / blobdiff