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62fe47a337
hooks as they're no longer needed. The major change with this patch is to make formatted_raw_ostream usable by any client of raw_ostream. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75283 91177308-0d34-0410-b5e6-96231b3b80d8
107 lines
3.3 KiB
C++
107 lines
3.3 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_CODEGEN_ASMSTREAM_H
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#define LLVM_CODEGEN_ASMSTREAM_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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/// raw_asm_fd_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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private:
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/// TheStream - The real stream we output to
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///
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raw_ostream &TheStream;
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/// Column - The current output column of the stream
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///
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unsigned Column;
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virtual void write_impl(const char *Ptr, unsigned 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, unsigned 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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/// \param Filename - The file to open. If this is "-" then the
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/// stream will use stdout instead.
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/// \param Binary - The file should be opened in binary mode on
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/// platforms that support this distinction.
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formatted_raw_ostream(raw_ostream &Stream)
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: raw_ostream(), TheStream(Stream), Column(0) {}
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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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/// Column - An I/O manipulator to advance the output to a certain column
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///
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class Column {
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private:
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/// Col - The column to move to
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///
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unsigned int Col;
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public:
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explicit Column(unsigned int c)
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: Col(c) {}
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/// operator() - Make Column a functor invokable by a stream
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/// output operator.
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///
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formatted_raw_ostream &operator()(formatted_raw_ostream &Out) const {
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// Make at least one space before the next output
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Out.PadToColumn(Col, 1);
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return(Out);
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}
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};
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/// operator<< - Support coulmn-setting in formatted streams.
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///
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inline formatted_raw_ostream &operator<<(formatted_raw_ostream &Out,
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const Column &Func)
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{
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return(Func(Out));
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}
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}
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#endif
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