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Don't allow formatted_ostream to be unbuffered, even if its underlying buffer

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is.
 - The problem is that formatted_ostream forces its underlying buffer to be
   unbuffered, so if some client happens to wrap a formatted_ostream around
   something, but still use the underlying stream, then we can end up writing on
   a fully unbuffered output (which was never intended to be unbuffered).

 - This makes clang (and presumably llvm-gcc) -emit-llvm -S a mere 10x faster.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82434 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Daniel Dunbar 2009-09-21 03:56:00 +00:00
parent 93c6c77340
commit cc1c702f62
1 changed files with 6 additions and 1 deletions
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7
include/llvm/Support/FormattedStream.h
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@ -105,10 +105,15 @@ namespace llvm
// own buffering, and it doesn't need or want TheStream to do another
// layer of buffering underneath. Resize the buffer to what TheStream
// had been using, and tell TheStream not to do its own buffering.
//
// If the underlying stream is unbuffered, just use its preferred buffer
// size. We can't treat this as an honest wish for unbuffered output,
// because it could very well be a stream we previously forced to be
// unbuffered.
if (size_t BufferSize = TheStream->GetBufferSize())
SetBufferSize(BufferSize);
else
SetUnbuffered();
SetBuffered();
TheStream->SetUnbuffered();
Scanned = 0;