llvm-6502/include/llvm/Support/raw_ostream.h
2009-06-04 07:09:50 +00:00

378 lines
12 KiB
C++

//===--- raw_ostream.h - Raw output stream ----------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the raw_ostream class.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_SUPPORT_RAW_OSTREAM_H
#define LLVM_SUPPORT_RAW_OSTREAM_H
#include "llvm/ADT/StringExtras.h"
#include <cassert>
#include <cstring>
#include <string>
#include <iosfwd>
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 {
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:
// 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() {
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=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_nonempty();
}
raw_ostream &operator<<(char C) {
if (OutBufCur >= OutBufEnd)
return write(C);
*OutBufCur++ = C;
return *this;
}
raw_ostream &operator<<(unsigned char C) {
if (OutBufCur >= OutBufEnd)
return write(C);
*OutBufCur++ = C;
return *this;
}
raw_ostream &operator<<(signed char C) {
if (OutBufCur >= OutBufEnd)
return write(C);
*OutBufCur++ = C;
return *this;
}
raw_ostream &operator<<(const char *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) {
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) {
this->operator<<(static_cast<unsigned long>(N));
return *this;
}
raw_ostream &operator<<(int N) {
this->operator<<(static_cast<long>(N));
return *this;
}
raw_ostream &operator<<(double 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 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
//===--------------------------------------------------------------------===//
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();
/// 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();
};
//===----------------------------------------------------------------------===//
// 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; 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 the stream is destroyed.
raw_fd_ostream(int fd, bool shouldClose,
bool unbuffered=false) : raw_ostream(unbuffered), FD(fd),
ShouldClose(shouldClose) {}
~raw_fd_ostream();
/// 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 {
// An out of line virtual method to provide a home for the class vtable.
virtual void handle();
public:
raw_stdout_ostream();
};
/// raw_stderr_ostream - This is a stream that always prints to stderr.
///
class raw_stderr_ostream : public raw_fd_ostream {
// An out of line virtual method to provide a home for the class vtable.
virtual void handle();
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();
//===----------------------------------------------------------------------===//
// 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) {}
~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