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duplication. Also, make setStream honor the old DeleteStream flag. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76075 91177308-0d34-0410-b5e6-96231b3b80d8
129 lines
4.3 KiB
C++
129 lines
4.3 KiB
C++
//===-- llvm/CodeGen/FormattedStream.h - Formatted streams ------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains raw_ostream implementations for streams to do
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// things like pretty-print comments.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SUPPORT_FORMATTEDSTREAM_H
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#define LLVM_SUPPORT_FORMATTEDSTREAM_H
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#include "llvm/Support/raw_ostream.h"
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namespace llvm
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{
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/// formatted_raw_ostream - Formatted raw_fd_ostream to handle
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/// asm-specific constructs.
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///
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class formatted_raw_ostream : public raw_ostream {
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public:
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/// DELETE_STREAM - Tell the destructor to delete the held stream.
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///
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const static bool DELETE_STREAM = true;
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/// PRESERVE_STREAM - Tell the destructor to not delete the held
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/// stream.
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///
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const static bool PRESERVE_STREAM = false;
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private:
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/// TheStream - The real stream we output to. We set it to be
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/// unbuffered, since we're already doing our own buffering.
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///
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raw_ostream *TheStream;
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/// DeleteStream - Do we need to delete TheStream in the
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/// destructor?
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///
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bool DeleteStream;
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/// Column - The current output column of the stream. The column
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/// scheme is zero-based.
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///
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unsigned Column;
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virtual void write_impl(const char *Ptr, size_t Size) {
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ComputeColumn(Ptr, Size);
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TheStream->write(Ptr, Size);
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}
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/// current_pos - Return the current position within the stream,
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/// not counting the bytes currently in the buffer.
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virtual uint64_t current_pos() {
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// This has the same effect as calling TheStream.current_pos(),
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// but that interface is private.
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return TheStream->tell() - TheStream->GetNumBytesInBuffer();
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}
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/// ComputeColumn - Examine the current output and figure out
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/// which column we end up in after output.
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///
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void ComputeColumn(const char *Ptr, size_t Size);
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public:
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/// formatted_raw_ostream - Open the specified file for
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/// writing. If an error occurs, information about the error is
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/// put into ErrorInfo, and the stream should be immediately
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/// destroyed; the string will be empty if no error occurred.
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///
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/// As a side effect, the given Stream is set to be Unbuffered.
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/// This is because formatted_raw_ostream does its own buffering,
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/// so it doesn't want another layer of buffering to be happening
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/// underneath it.
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///
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formatted_raw_ostream(raw_ostream &Stream, bool Delete = false)
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: raw_ostream(), TheStream(0), DeleteStream(false), Column(0) {
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setStream(Stream, Delete);
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}
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explicit formatted_raw_ostream()
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: raw_ostream(), TheStream(0), DeleteStream(false), Column(0) {}
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~formatted_raw_ostream() {
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if (DeleteStream)
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delete TheStream;
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}
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void setStream(raw_ostream &Stream, bool Delete = false) {
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if (DeleteStream)
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delete TheStream;
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TheStream = &Stream;
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DeleteStream = Delete;
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// This formatted_raw_ostream inherits from raw_ostream, so it'll do its
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// own buffering, and it doesn't need or want TheStream to do another
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// layer of buffering underneath. Resize the buffer to what TheStream
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// had been using, and tell TheStream not to do its own buffering.
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TheStream->flush();
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if (size_t BufferSize = TheStream->GetNumBytesInBuffer())
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SetBufferSize(BufferSize);
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TheStream->SetUnbuffered();
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}
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/// PadToColumn - Align the output to some column number.
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///
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/// \param NewCol - The column to move to.
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/// \param MinPad - The minimum space to give after the most
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/// recent I/O, even if the current column + minpad > newcol.
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///
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void PadToColumn(unsigned NewCol, unsigned MinPad = 0);
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};
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/// fouts() - This returns a reference to a formatted_raw_ostream for
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/// standard output. Use it like: fouts() << "foo" << "bar";
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formatted_raw_ostream &fouts();
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/// ferrs() - This returns a reference to a formatted_raw_ostream for
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/// standard error. Use it like: ferrs() << "foo" << "bar";
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formatted_raw_ostream &ferrs();
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} // end llvm namespace
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#endif
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