This can't arise from a clean build, but it can happen if you have
products lingering in a search path and then either rebuild one of
the modules in the cycle, or change the search paths.
The way this is implemented is for each module to track whether its
imports have all been resolved. If, when loading a module, one of its
dependencies hasn't resolved all of its imports yet, then we know
there's a cycle.
This doesn't produce the best diagnostics, but it's hard to get into
this state in the first place, so that's probably okay.
https://bugs.swift.org/browse/SR-7483
... instead of an array of compiler arguments. This is good enough
for seeing what's going on, and it saves significant time for long
argument strings, because it doesn't create and destroy so many
xpc strings, and more of the string copying that happens is on a large
contiguous string instead of many small strings.
rdar://39538847
This code was an experiment in how to collect information after a crash,
that did not end up being used. It's unclear how much it has bitrotted
at this point, since it has no tests and was not designed with automated
testing in mind. Parts of it interfere with some changes I want to make
to the underlying tracing mechanism, so I am finally removing it. This
also lets us remove the buffer copying in the parts of tracing used by
the compile notifications, improving performance.
For rdar://39538847
This provides a very rudimentary way to check the end-to-end performance
of simple sourcekitd requests. A sample invocation might be
```
sourcekitd-test -time-request -repeat-request=10 -dont-print-response -req= ...
```
This is useful because the embedded platforms may have the same toolchain version but they contain
different stdlibs. We need to make sure the XPC service name is unique between them, otherwise we may load
and use the incorrect toolchain service.
rdar://39077520
Stop filtering out diagnostics with invalid locations in the editor
diagnostic consumer, and instead capture them separately so that we can
include them in did-compile notifications.
rdar://39225000
The only interesting change here is that I stopped filtering out
non-note diagnostics from outside the "inputs". This matches better how
code-completion gets inputs, and shouldn't hurt anything else since only
the tracing code will look at diagnostics that aren't in specific
buffers anyway.
rdar://38438512
Notifications that we want to print for testing (e.g. with FileCheck)
are now buffered and drained explicitly from the queue that performs
requests. This should prevent output intervleaving and ensure that we
actually print all the notifications that have been posted before
exiting (observed as rare test failures).
rdar://39048773
When enabled, send a notification before/after every "compilation",
which for now means `performSema`. This piggy-backs and modifies some
existing code that we had for "tracing" operations in sourcekitd that
unfortunately was untested. At least now some of the basic parts are
tested via the new notifications.
Part of rdar://38438512
This is how it was used in all but one place anyway, and makes it easier
to understand. It also aligns better with some further refactoring I
want to do...
