-//===--- raw_ostream.h - Raw output stream --------------------------------===//
+//===--- raw_ostream.h - Raw output stream ----------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
#define LLVM_SUPPORT_RAW_OSTREAM_H
#include "llvm/ADT/StringExtras.h"
+#include "llvm/ADT/StringRef.h"
#include <cassert>
#include <cstring>
#include <string>
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:
+ // Do not implement. raw_ostream is noncopyable.
+ void operator=(const raw_ostream &);
+ raw_ostream(const raw_ostream &);
+
+ /// 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 (BufferMode == Unbuffered)
+ /// 1. Uninitialized (BufferMode != Unbuffered && OutBufStart == 0).
+ /// 2. Buffered (BufferMode != Unbuffered && OutBufStart != 0 &&
+ /// OutBufEnd - OutBufStart >= 64).
+ ///
+ /// If buffered, then the raw_ostream owns the buffer if (BufferMode ==
+ /// InternalBuffer); otherwise the buffer has been set via SetBuffer and is
+ /// managed by the subclass.
+ ///
+ /// If a subclass installs an external buffer using SetBuffer then it can wait
+ /// for a \see write_impl() call to handle the data which has been put into
+ /// this buffer.
char *OutBufStart, *OutBufEnd, *OutBufCur;
+
+ enum BufferKind {
+ Unbuffered = 0,
+ InternalBuffer,
+ ExternalBuffer
+ } BufferMode;
+
+ /// Error This flag is true if an error of any kind has been detected.
+ ///
+ bool Error;
+
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)
+ : BufferMode(unbuffered ? Unbuffered : InternalBuffer), Error(false) {
// Start out ready to flush.
OutBufStart = OutBufEnd = OutBufCur = 0;
}
- virtual ~raw_ostream() {}
-
+
+ virtual ~raw_ostream();
+
+ /// tell - Return the current offset with the file.
+ uint64_t tell() { return current_pos() + GetNumBytesInBuffer(); }
+
+ /// has_error - Return the value of the flag in this raw_ostream indicating
+ /// whether an output error has been encountered.
+ bool has_error() const {
+ return Error;
+ }
+
+ /// clear_error - Set the flag read by has_error() to false. If the error
+ /// flag is set at the time when this raw_ostream's destructor is called,
+ /// llvm_report_error is called to report the error. Use clear_error()
+ /// after handling the error to avoid this behavior.
+ void clear_error() {
+ Error = false;
+ }
+
//===--------------------------------------------------------------------===//
// Configuration Interface
//===--------------------------------------------------------------------===//
-
- /// SetBufferSize - Set the internal buffer size to the specified amount
- /// instead of the default.
- void SetBufferSize(unsigned Size) {
- assert(Size >= 64 &&
- "Buffer size must be somewhat large for invariants to hold");
+
+ /// SetBuffered - Set the stream to be buffered, with an automatically
+ /// determined buffer size.
+ void SetBuffered();
+
+ /// SetBufferSize - Set the stream to be buffered, using the
+ /// specified buffer size.
+ void SetBufferSize(size_t Size) {
flush();
-
- delete [] OutBufStart;
- OutBufStart = new char[Size];
- OutBufEnd = OutBufStart+Size;
- OutBufCur = OutBufStart;
+ SetBufferAndMode(new char[Size], Size, InternalBuffer);
}
-
+
+ size_t GetBufferSize() {
+ // If we're supposed to be buffered but haven't actually gotten around
+ // to allocating the buffer yet, return the value that would be used.
+ if (!Unbuffered && !OutBufStart)
+ return preferred_buffer_size();
+
+ // Otherwise just return the size of the allocated buffer.
+ return OutBufEnd - OutBufStart;
+ }
+
+ /// SetUnbuffered - Set the stream to be unbuffered. 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();
+ SetBufferAndMode(0, 0, Unbuffered);
+ }
+
+ size_t 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 StringRef &Str) {
+ // Inline fast path, particularly for strings with a known length.
+ size_t Size = Str.size();
+
+ // Make sure we can use the fast path.
+ if (OutBufCur+Size > OutBufEnd)
+ return write(Str.data(), Size);
+
+ memcpy(OutBufCur, Str.data(), Size);
+ OutBufCur += Size;
+ 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.
+
+ this->operator<<(StringRef(Str));
+ return *this;
}
-
- raw_ostream &operator<<(const std::string& Str) {
- return write(Str.data(), Str.length());
+
+ raw_ostream &operator<<(const std::string &Str) {
+ // Avoid the fast path, it would only increase code size for a marginal win.
+
+ 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(const char *Ptr, unsigned Size);
-
- // Formatted output, see the format() function below.
+
+ /// write_hex - Output \arg N in hexadecimal, without any prefix or padding.
+ raw_ostream &write_hex(unsigned long long N);
+
+ raw_ostream &write(unsigned char C);
+ raw_ostream &write(const char *Ptr, size_t Size);
+
+ // 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.
+ ///
+ /// This function is guaranteed to only be called at a point at which it is
+ /// safe for the subclass to install a new buffer via SetBuffer.
+ ///
+ /// \arg Ptr - The start of the data to be written. For buffered streams this
+ /// is guaranteed to be the start of the buffer.
+ /// \arg Size - The number of bytes to be written.
+ ///
+ /// \invariant { Size > 0 }
+ virtual void write_impl(const char *Ptr, size_t 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 {
+ /// current_pos - Return the current position within the stream, not
+ /// counting the bytes currently in the buffer.
+ virtual uint64_t current_pos() = 0;
+
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;
+ /// SetBuffer - Use the provided buffer as the raw_ostream buffer. This is
+ /// intended for use only by subclasses which can arrange for the output to go
+ /// directly into the desired output buffer, instead of being copied on each
+ /// flush.
+ void SetBuffer(char *BufferStart, size_t Size) {
+ SetBufferAndMode(BufferStart, Size, ExternalBuffer);
}
+
+ /// preferred_buffer_size - Return an efficient buffer size for the
+ /// underlying output mechanism.
+ virtual size_t preferred_buffer_size();
+
+ /// error_detected - Set the flag indicating that an output error has
+ /// been encountered.
+ void error_detected() { Error = true; }
+
+ /// getBufferStart - Return the beginning of the current stream buffer, or 0
+ /// if the stream is unbuffered.
+ const char *getBufferStart() const { return OutBufStart; }
+
+ //===--------------------------------------------------------------------===//
+ // Private Interface
+ //===--------------------------------------------------------------------===//
+private:
+ /// SetBufferAndMode - Install the given buffer and mode.
+ void SetBufferAndMode(char *BufferStart, size_t Size, BufferKind Mode);
+
+ /// 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();
+
+ /// copy_to_buffer - Copy data into the buffer. Size must not be
+ /// greater than the number of unused bytes in the buffer.
+ void copy_to_buffer(const char *Ptr, size_t Size);
};
-/// 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, size_t 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; }
+
+ /// preferred_buffer_size - Determine an efficient buffer size.
+ virtual size_t preferred_buffer_size();
+
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.
+ /// \param Force - Don't consider the case where the file already
+ /// exists to be an error.
+ raw_fd_ostream(const char *Filename, bool Binary, bool Force,
+ 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();
+
+ /// 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();
-
-
+
+/// nulls() - This returns a reference to a raw_ostream which simply discards
+/// output.
+raw_ostream &nulls();
+
//===----------------------------------------------------------------------===//
-// Bridge Output Streams
+// Output Stream Adaptors
//===----------------------------------------------------------------------===//
-
+
/// raw_os_ostream - A raw_ostream that writes to an std::ostream. This is a
-/// simple adaptor class.
+/// simple adaptor class. It does not check for output errors; clients should
+/// use the underlying stream to detect errors.
class raw_os_ostream : public raw_ostream {
std::ostream &OS;
+
+ /// write_impl - See raw_ostream::write_impl.
+ virtual void write_impl(const char *Ptr, size_t 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();
};
-
+
+/// raw_string_ostream - A raw_ostream that writes to an std::string. This is a
+/// simple adaptor class. This class does not encounter output errors.
+class raw_string_ostream : public raw_ostream {
+ std::string &OS;
+
+ /// write_impl - See raw_ostream::write_impl.
+ virtual void write_impl(const char *Ptr, size_t 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:
+ explicit raw_string_ostream(std::string &O) : OS(O) {}
+ ~raw_string_ostream();
+
+ /// 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. This class does not
+/// encounter output errors.
+class raw_svector_ostream : public raw_ostream {
+ SmallVectorImpl<char> &OS;
+
+ /// write_impl - See raw_ostream::write_impl.
+ virtual void write_impl(const char *Ptr, size_t Size);
+
+ /// current_pos - Return the current position within the stream, not
+ /// counting the bytes currently in the buffer.
+ virtual uint64_t current_pos();
+public:
+ /// Construct a new raw_svector_ostream.
+ ///
+ /// \arg O - The vector to write to; this *must* have at least 128 bytes of
+ /// free space in it.
+ explicit raw_svector_ostream(SmallVectorImpl<char> &O);
+ ~raw_svector_ostream();
+};
+
+/// raw_null_ostream - A raw_ostream that discards all output.
+class raw_null_ostream : public raw_ostream {
+ /// write_impl - See raw_ostream::write_impl.
+ virtual void write_impl(const char *Ptr, size_t size);
+
+ /// current_pos - Return the current position within the stream, not
+ /// counting the bytes currently in the buffer.
+ virtual uint64_t current_pos();
+
+public:
+ explicit raw_null_ostream() {}
+ ~raw_null_ostream();
+};
+
} // end llvm namespace
#endif
projects / oota-llvm.git / blobdiff