-//===-- llvm/CodeGen/AsmStream.cpp - AsmStream Framework --------*- C++ -*-===//
+//===-- llvm/Support/FormattedStream.cpp - Formatted streams ----*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
-// This file was developed by the LLVM research group and is distributed under
-// the University of Illinois Open Source License. See LICENSE.TXT for details.
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
-// This file contains instantiations of "standard" AsmOStreams.
+// This file contains the implementation of formatted_raw_ostream.
//
//===----------------------------------------------------------------------===//
+#include "llvm/Support/Debug.h"
#include "llvm/Support/FormattedStream.h"
+#include <algorithm>
-namespace llvm {
- /// ComputeColumn - Examine the current output and figure out which
- /// column we end up in after output.
- ///
- void formatted_raw_ostream::ComputeColumn(const char *Ptr, unsigned Size)
- {
- // Keep track of the current column by scanning the string for
- // special characters
+using namespace llvm;
- // Find the last newline. This is our column start. If there
- // is no newline, start with the current column.
- const char *nlpos = NULL;
- for (const char *pos = Ptr + Size, *epos = Ptr; pos > epos; --pos) {
- if (*(pos-1) == '\n') {
- nlpos = pos-1;
- // The newline will be counted, setting this to zero. We
- // need to do it this way in case nlpos is Ptr.
- Column = -1;
- break;
- }
- }
-
- if (nlpos == NULL) {
- nlpos = Ptr;
- }
+/// 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;
- // Walk through looking for tabs and advance column as appropriate
- for (const char *pos = nlpos, *epos = Ptr + Size; pos != epos; ++pos) {
- ++Column;
- if (*pos == '\t') {
- // Advance to next tab stop (every eight characters)
- Column += ((8 - (Column & 0x7)) & 0x7);
- assert(!(Column & 0x3) && "Column out of alignment");
- }
+ // 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;
}
}
+}
- /// 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)
- {
- flush();
+/// 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);
- // Output spaces until we reach the desired column
- unsigned num = NewCol - Column;
- if (NewCol < Column || num < MinPad) {
- num = MinPad;
- }
+ // Update the scanning pointer.
+ Scanned = Ptr + Size;
+}
- // TODO: Write a whole string at a time
- while (num-- > 0) {
- write(' ');
- }
- }
+/// 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;
}
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