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//===-- llvm/CodeGen/FormattedStream.h - Formatted streams ------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains raw_ostream implementations for streams to do
// things like pretty-print comments.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CODEGEN_ASMSTREAM_H
#define LLVM_CODEGEN_ASMSTREAM_H
#include "llvm/Support/raw_ostream.h"
namespace llvm
{
/// raw_asm_fd_ostream - Formatted raw_fd_ostream to handle
/// asm-specific constructs
///
class formatted_raw_ostream : public raw_ostream {
private:
/// TheStream - The real stream we output to
///
raw_ostream &TheStream;
/// Column - The current output column of the stream
///
unsigned Column;
virtual void write_impl(const char *Ptr, unsigned Size) {
ComputeColumn(Ptr, Size);
TheStream.write(Ptr, Size);
}
/// current_pos - Return the current position within the stream,
/// not counting the bytes currently in the buffer.
virtual uint64_t current_pos() {
// This has the same effect as calling TheStream.current_pos(),
// but that interface is private.
return TheStream.tell() - TheStream.GetNumBytesInBuffer();
}
/// ComputeColumn - Examine the current output and figure out
/// which column we end up in after output.
///
void ComputeColumn(const char *Ptr, unsigned Size);
public:
/// formatted_raw_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.
formatted_raw_ostream(raw_ostream &Stream)
: raw_ostream(), TheStream(Stream), Column(0) {}
/// PadToColumn - Align the output to some column number
///
/// \param NewCol - The column to move to
/// \param MinPad - The minimum space to give after the most
/// recent I/O, even if the current column + minpad > newcol
///
void PadToColumn(unsigned NewCol, unsigned MinPad = 0);
};
/// Column - An I/O manipulator to advance the output to a certain column
///
class Column {
private:
/// Col - The column to move to
///
unsigned int Col;
public:
explicit Column(unsigned int c)
: Col(c) {}
/// operator() - Make Column a functor invokable by a stream
/// output operator.
///
formatted_raw_ostream &operator()(formatted_raw_ostream &Out) const {
// Make at least one space before the next output
Out.PadToColumn(Col, 1);
return(Out);
}
};
/// operator<< - Support coulmn-setting in formatted streams.
///
inline formatted_raw_ostream &operator<<(formatted_raw_ostream &Out,
const Column &Func)
{
return(Func(Out));
}
}
#endif
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