Make changes suggested by Chris and eliminate newly-added raw_ostream

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

2 files changed, 74 insertions, 1 deletions

diff --git a/lib/Support/FormattedStream.cpp b/lib/Support/FormattedStream.cpp
new file mode 100644
index 0000000..d471d53
--- /dev/null
+++ b/lib/Support/FormattedStream.cpp
@@ -0,0 +1,74 @@
+//===-- llvm/CodeGen/AsmStream.cpp - AsmStream Framework --------*- 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 contains instantiations of "standard" AsmOStreams.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Support/FormattedStream.h"
+
+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
+
+    // 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;
+    }
+
+    // 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");
+      }
+    }
+  }
+
+  /// 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();
+
+    // Output spaces until we reach the desired column
+    unsigned num = NewCol - Column;
+    if (NewCol < Column || num < MinPad) {
+      num = MinPad;
+    }
+
+    // TODO: Write a whole string at a time
+    while (num-- > 0) {
+      write(' ');
+    }
+  }
+}
diff --git a/lib/Support/raw_ostream.cpp b/lib/Support/raw_ostream.cpp
index 403300f..42e6fda 100644
--- a/lib/Support/raw_ostream.cpp
+++ b/lib/Support/raw_ostream.cpp
@@ -120,7 +120,6 @@ raw_ostream &raw_ostream::operator<<(const void *P) {
 
 void raw_ostream::flush_nonempty() {
   assert(OutBufCur > OutBufStart && "Invalid call to flush_nonempty.");
-  AboutToFlush();
   write_impl(OutBufStart, OutBufCur - OutBufStart);
   OutBufCur = OutBufStart;    
 }