//
//===----------------------------------------------------------------------===//
+#include "llvm/Support/Debug.h"
#include "llvm/Support/FormattedStream.h"
#include <algorithm>
using namespace llvm;
-/// ComputeColumn - Examine the current output and figure out which
-/// column we end up in after output.
+/// UpdatePosition - Examine the given char sequence and figure out which
+/// column we end up in after output, and how many line breaks are contained.
///
-void formatted_raw_ostream::ComputeColumn() {
- // Keep track of the current column by scanning the string for
- // special characters
-
- // The buffer may have been allocated underneath us.
- if (Scanned == 0 && GetNumBytesInBuffer() != 0) {
- Scanned = begin();
- }
+static void UpdatePosition(std::pair<unsigned, unsigned> &Position, const char *Ptr, size_t Size) {
+ unsigned &Column = Position.first;
+ unsigned &Line = Position.second;
- while (Scanned != end()) {
- ++ColumnScanned;
- if (*Scanned == '\n' || *Scanned == '\r')
- ColumnScanned = 0;
- else if (*Scanned == '\t')
+ // 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.
- ColumnScanned += (8 - (ColumnScanned & 0x7)) & 0x7;
- ++Scanned;
+ 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.
-/// \param MinPad - The minimum space to give after the most recent
-/// I/O, even if the current column + minpad > newcol.
///
-void formatted_raw_ostream::PadToColumn(unsigned NewCol, unsigned MinPad) {
+formatted_raw_ostream &formatted_raw_ostream::PadToColumn(unsigned NewCol) {
// Figure out what's in the buffer and add it to the column count.
- ComputeColumn();
+ ComputePosition(getBufferStart(), GetNumBytesInBuffer());
// Output spaces until we reach the desired column.
- unsigned num = NewCol - ColumnScanned;
- if (NewCol < ColumnScanned || num < MinPad)
- num = MinPad;
+ indent(std::max(int(NewCol - getColumn()), 1));
+ return *this;
+}
- // Keep a buffer of spaces handy to speed up processing.
- const char *Spaces = " "
- " ";
+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);
- assert(num < MAX_COLUMN_PAD && "Unexpectedly large column padding");
+ // Write the data to the underlying stream (which is unbuffered, so
+ // the data will be immediately written out).
+ TheStream->write(Ptr, Size);
- write(Spaces, num);
+ // Reset the scanning pointer.
+ Scanned = 0;
}
/// fouts() - This returns a reference to a formatted_raw_ostream for
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;
+}