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raw_ostream: Put all exceptional conditions in raw_ostream::write

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under a single branch.

Also, add a FIXME for formatted output.

llvm-svn: 67069
This commit is contained in:
Daniel Dunbar 2009-03-17 01:36:56 +00:00
parent 0dccb325d1
commit 2cc1ec75e1
1 changed files with 30 additions and 18 deletions
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48
lib/Support/raw_ostream.cpp
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@ -123,30 +123,36 @@ void raw_ostream::flush_nonempty() {
}
raw_ostream &raw_ostream::write(unsigned char C) {
if (Unbuffered) {
write_impl(reinterpret_cast<char*>(&C), 1);
return *this;
// Group exceptional cases into a single branch.
if (OutBufCur >= OutBufEnd) {
if (Unbuffered) {
write_impl(reinterpret_cast<char*>(&C), 1);
return *this;
}
if (!OutBufStart)
SetBufferSize();
else
flush_nonempty();
}
if (!OutBufStart)
SetBufferSize();
else if (OutBufCur >= OutBufEnd)
flush_nonempty();
*OutBufCur++ = C;
return *this;
}
raw_ostream &raw_ostream::write(const char *Ptr, unsigned Size) {
if (Unbuffered) {
write_impl(Ptr, Size);
return *this;
}
// Group exceptional cases into a single branch.
if (OutBufCur+Size > OutBufEnd) {
if (Unbuffered) {
write_impl(Ptr, Size);
return *this;
}
if (!OutBufStart)
SetBufferSize();
else if (OutBufCur+Size > OutBufEnd)
flush_nonempty();
if (!OutBufStart)
SetBufferSize();
else
flush_nonempty();
}
// Handle short strings specially, memcpy isn't very good at very short
// strings.
@ -176,8 +182,14 @@ raw_ostream &raw_ostream::write(const char *Ptr, unsigned Size) {
// Formatted output.
raw_ostream &raw_ostream::operator<<(const format_object_base &Fmt) {
// If we have more than a few bytes left in our output buffer, try formatting
// directly onto its end.
// If we have more than a few bytes left in our output buffer, try
// formatting directly onto its end.
//
// FIXME: This test is a bit silly, since if we don't have enough
// space in the buffer we will have to flush the formatted output
// anyway. We should just flush upfront in such cases, and use the
// whole buffer as our scratch pad. Note, however, that this case is
// also necessary for correctness on unbuffered streams.
unsigned NextBufferSize = 127;
if (OutBufEnd-OutBufCur > 3) {
unsigned BufferBytesLeft = OutBufEnd-OutBufCur;