f785676f2a
all of the features in the current working draft of the upcoming C++ standard, provisionally named C++1y. The code generator's performance is greatly increased, and the loop auto-vectorizer is now enabled at -Os and -O2 in addition to -O3. The PowerPC backend has made several major improvements to code generation quality and compile time, and the X86, SPARC, ARM32, Aarch64 and SystemZ backends have all seen major feature work. Release notes for llvm and clang can be found here: <http://llvm.org/releases/3.4/docs/ReleaseNotes.html> <http://llvm.org/releases/3.4/tools/clang/docs/ReleaseNotes.html> MFC after: 1 month
107 lines
3.4 KiB
C++
107 lines
3.4 KiB
C++
//===-- llvm/Support/FormattedStream.cpp - 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 the implementation of formatted_raw_ostream.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/FormattedStream.h"
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#include <algorithm>
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using namespace llvm;
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/// UpdatePosition - Examine the given char sequence and figure out which
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/// column we end up in after output, and how many line breaks are contained.
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///
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static void UpdatePosition(std::pair<unsigned, unsigned> &Position, const char *Ptr, size_t Size) {
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unsigned &Column = Position.first;
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unsigned &Line = Position.second;
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// Keep track of the current column and line by scanning the string for
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// special characters
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for (const char *End = Ptr + Size; Ptr != End; ++Ptr) {
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++Column;
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switch (*Ptr) {
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case '\n':
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Line += 1;
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case '\r':
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Column = 0;
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break;
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case '\t':
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// Assumes tab stop = 8 characters.
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Column += (8 - (Column & 0x7)) & 0x7;
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break;
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}
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}
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}
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/// ComputePosition - Examine the current output and update line and column
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/// counts.
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void formatted_raw_ostream::ComputePosition(const char *Ptr, size_t Size) {
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// If our previous scan pointer is inside the buffer, assume we already
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// scanned those bytes. This depends on raw_ostream to not change our buffer
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// in unexpected ways.
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if (Ptr <= Scanned && Scanned <= Ptr + Size)
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// Scan all characters added since our last scan to determine the new
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// column.
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UpdatePosition(Position, Scanned, Size - (Scanned - Ptr));
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else
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UpdatePosition(Position, Ptr, Size);
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// Update the scanning pointer.
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Scanned = Ptr + Size;
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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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///
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formatted_raw_ostream &formatted_raw_ostream::PadToColumn(unsigned NewCol) {
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// Figure out what's in the buffer and add it to the column count.
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ComputePosition(getBufferStart(), GetNumBytesInBuffer());
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// Output spaces until we reach the desired column.
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indent(std::max(int(NewCol - getColumn()), 1));
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return *this;
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}
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void formatted_raw_ostream::write_impl(const char *Ptr, size_t Size) {
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// Figure out what's in the buffer and add it to the column count.
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ComputePosition(Ptr, Size);
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// Write the data to the underlying stream (which is unbuffered, so
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// the data will be immediately written out).
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TheStream->write(Ptr, Size);
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// Reset the scanning pointer.
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Scanned = 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 &llvm::fouts() {
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static formatted_raw_ostream S(outs());
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return S;
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}
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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 &llvm::ferrs() {
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static formatted_raw_ostream S(errs());
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return S;
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}
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/// fdbgs() - This returns a reference to a formatted_raw_ostream for
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/// the debug stream. Use it like: fdbgs() << "foo" << "bar";
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formatted_raw_ostream &llvm::fdbgs() {
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static formatted_raw_ostream S(dbgs());
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return S;
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}
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