More work on decoupling the general runtime from Interpreter. The goal
is becoming clearer. Interpreter should be one possible way to execute
code inside a VM. In the future we might have other ways :^)
Okay, my vision here is improving. Interpreter should be a thing that
executes an AST. The scope stack is irrelevant to the VM proper,
so we can move that to the Interpreter. Same with execute_statement().
This patch moves the exception state, call stack and scope stack from
Interpreter to VM. I'm doing this to help myself discover what the
split between Interpreter and VM should be, by shuffling things around
and seeing what falls where.
With these changes, we no longer have a persistent lexical environment
for the current global object on the Interpreter's call stack. Instead,
we push/pop that environment on Interpreter::run() enter/exit.
Since it should only be used to find the global "this", and not for
variable storage (that goes directly into the global object instead!),
I had to insert some short-circuiting when walking the environment
parent chain during variable lookup.
Note that this is a "stepping stone" commit, not a final design.
Similar to Process, we need to make Thread refcounted. This will solve
problems that will appear once we schedule threads on more than one
processor. This allows us to hold onto threads without necessarily
holding the scheduler lock for the entire duration.
These are supposed to be both functions and macros. I'm not sure
how to provide the functions at the same time as the macros,
as they collide with each other and cause compile errors.
However, some ports fully expect them to be functions.
For example, OpenSSH stores them into structures as function
pointers.
This patchset makes it possible for the shell to format the current
buffer of the line editor live, with somewhat accurate cursor tracking.
Since this feature is pretty goofy at best, let's keep it off by default
for now :^)
In /proc/PID/fds we get not only file name, but also additional information
about file type, state etc. This commit makes `lsof' command separate these
components. When you are filtering files by file name, only actual file name
is checked (not additional data).
I put this into the <AK/PrintfImplementation.h> header in the hope that
it could be re-used by the printf implementation. That would not be
super trivial though, so I am not doing that now.
