108 lines
3.4 KiB
C++
108 lines
3.4 KiB
C++
//===-- llvm/Support/FormattedStream.cpp - 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 the implementation of formatted_raw_ostream.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/Support/Debug.h"
|
|
#include "llvm/Support/FormattedStream.h"
|
|
#include "llvm/Support/raw_ostream.h"
|
|
#include <algorithm>
|
|
|
|
using namespace llvm;
|
|
|
|
/// UpdatePosition - Examine the given char sequence and figure out which
|
|
/// column we end up in after output, and how many line breaks are contained.
|
|
///
|
|
static void UpdatePosition(std::pair<unsigned, unsigned> &Position, const char *Ptr, size_t Size) {
|
|
unsigned &Column = Position.first;
|
|
unsigned &Line = Position.second;
|
|
|
|
// Keep track of the current column and line by scanning the string for
|
|
// special characters
|
|
for (const char *End = Ptr + Size; Ptr != End; ++Ptr) {
|
|
++Column;
|
|
switch (*Ptr) {
|
|
case '\n':
|
|
Line += 1;
|
|
case '\r':
|
|
Column = 0;
|
|
break;
|
|
case '\t':
|
|
// Assumes tab stop = 8 characters.
|
|
Column += (8 - (Column & 0x7)) & 0x7;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/// ComputePosition - Examine the current output and update line and column
|
|
/// counts.
|
|
void formatted_raw_ostream::ComputePosition(const char *Ptr, size_t Size) {
|
|
// If our previous scan pointer is inside the buffer, assume we already
|
|
// scanned those bytes. This depends on raw_ostream to not change our buffer
|
|
// in unexpected ways.
|
|
if (Ptr <= Scanned && Scanned <= Ptr + Size)
|
|
// Scan all characters added since our last scan to determine the new
|
|
// column.
|
|
UpdatePosition(Position, Scanned, Size - (Scanned - Ptr));
|
|
else
|
|
UpdatePosition(Position, Ptr, Size);
|
|
|
|
// Update the scanning pointer.
|
|
Scanned = Ptr + Size;
|
|
}
|
|
|
|
/// PadToColumn - Align the output to some column number.
|
|
///
|
|
/// \param NewCol - The column to move to.
|
|
///
|
|
formatted_raw_ostream &formatted_raw_ostream::PadToColumn(unsigned NewCol) {
|
|
// Figure out what's in the buffer and add it to the column count.
|
|
ComputePosition(getBufferStart(), GetNumBytesInBuffer());
|
|
|
|
// Output spaces until we reach the desired column.
|
|
indent(std::max(int(NewCol - getColumn()), 1));
|
|
return *this;
|
|
}
|
|
|
|
void formatted_raw_ostream::write_impl(const char *Ptr, size_t Size) {
|
|
// Figure out what's in the buffer and add it to the column count.
|
|
ComputePosition(Ptr, Size);
|
|
|
|
// Write the data to the underlying stream (which is unbuffered, so
|
|
// the data will be immediately written out).
|
|
TheStream->write(Ptr, Size);
|
|
|
|
// Reset the scanning pointer.
|
|
Scanned = nullptr;
|
|
}
|
|
|
|
/// fouts() - This returns a reference to a formatted_raw_ostream for
|
|
/// standard output. Use it like: fouts() << "foo" << "bar";
|
|
formatted_raw_ostream &llvm::fouts() {
|
|
static formatted_raw_ostream S(outs());
|
|
return S;
|
|
}
|
|
|
|
/// ferrs() - This returns a reference to a formatted_raw_ostream for
|
|
/// standard error. Use it like: ferrs() << "foo" << "bar";
|
|
formatted_raw_ostream &llvm::ferrs() {
|
|
static formatted_raw_ostream S(errs());
|
|
return S;
|
|
}
|
|
|
|
/// fdbgs() - This returns a reference to a formatted_raw_ostream for
|
|
/// the debug stream. Use it like: fdbgs() << "foo" << "bar";
|
|
formatted_raw_ostream &llvm::fdbgs() {
|
|
static formatted_raw_ostream S(dbgs());
|
|
return S;
|
|
}
|