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Prior to this, we wrote to the log every time the << operator
was used, which meant that only these parts of the log statement
were serialized. If the thread was preempted, or especially with
multiple CPUs the debug output was hard to decipher. Instead, we
buffer up the log statements. To avoid allocations we'll attempt
to use stack space, which covers most log statements.
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This was supposed to be the foundation for some kind of pre-kernel
environment, but nobody is working on it right now, so let's move
everything back into the kernel and remove all the confusion.
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LogStream::operator<<(const LogStream&, long) was implemented in
AK/LogStream.cpp but the declaration was missing from the header.
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Our C++ code generator tools have been relying on host-side dbg() being
forwarded to stdout until now. Now they use out() instead.
Hopefully this will make it easier and more enticing to use streams in
userspace programs as well. :^)
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You can now #include <AK/Forward.h> to get most of the AK types as
forward declarations.
Header dependency explosion is one of the main contributors to compile
times at the moment, so this is a step towards smaller include graphs.
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As suggested by Joshua, this commit adds the 2-clause BSD license as a
comment block to the top of every source file.
For the first pass, I've just added myself for simplicity. I encourage
everyone to add themselves as copyright holders of any file they've
added or modified in some significant way. If I've added myself in
error somewhere, feel free to replace it with the appropriate copyright
holder instead.
Going forward, all new source files should include a license header.
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Let's simplify things. There is now only KERNEL.
To see if you're on Serenity, check if __serenity__ is defined.
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This has been an annoyingly missing feature for some time.
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This didn't end up getting used, so let's get rid of it.
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Using the new get_process_name() syscall, we can automatically prefix
all userspace debug logging.
Hopefully this is more helpful than annoying. We'll find out! :^)
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Qt had a pretty good name for this concept, so let's steal it. :^)
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This is very handy for the DebugLogStream implementation, among others. :^)
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Meet TStyle. It allows you to write things like this:
dbg() << TStyle(TStyle::Red, TStyle::Bold) << "Hello, friends!";
Any style used will be reset along with the newline emitted when the dbg()
temporary goes out of scope. :^)
This can definitely be improved, but I think it's a decent place to start.
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The first implementation class is DebugLogStream, which can be used like so:
dbg() << "Hello friends, I am " << m_years << " years old!";
Note that it will automatically print a newline when the object created by
dbg() goes out of scope.
This API will grow and evolve, so let's see what we end up with :^)
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