We scan the target's initial allocation pool, and all 16kB heap allocations. We check each pointer-aligned offset within those areas, and try to read it as Swift metadata and get a name from it. If that fails, quietly move on. It's very unlikely for some random memory to look enough like Swift metadata for this to produce a name, so this works very well to print the generic metadata instantiated in the remote process without requiring `SWIFT_DEBUG_ENABLE_METADATA_ALLOCATION_ITERATION`.
rdar://161120936
In DarwinRemoteProcess's early return when libswiftCore.dylib isn't loaded in the process, we hadn't initialized all stored properties yet, which means our deinit didn't run. This leaked the task. This is especially bad when forking a corpse, as the system has a very limited number of corpses available.
Add a Cleanup helper to manage resources that need explicit cleanup. This is a noncopyable struct which takes a cleanup function and calls it whenever a new value is set or when the struct is destroyed. Use this for the DarwinRemoteProcess properties that need explicit cleanup. This allows us to remove DarwinRemoteProcess's deinit and always run these cleanups regardless of how we exit the initializer.
While we're here, fix the truncations of buffer in getAllProcesses.
rdar://151170155
It seems that a recent change to the compiler will now optimize the
initializer and then the SIL verifier will fail due to the unintialized
member when the initializer is throwing and will never return without
initializing the member unless the initialization fails.
* [Concurrency] Initial steps for startSynchronously for Task
* [Concurrency] Rename to _startSynchronously while in development
* [Concurrency] StartSynchronously special executor to avoid switching
* startSynchronously bring back more info output
* [Concurrency] startSynchronously with more custom executor tests
* add missing ABI additions to test for x86
* [Concurrency] gyb generate _startSynchronously
* [Concurrency] %import dispatch for Linux startSynchronously test
* [Concurrency] Add TaskGroup.startTaskSynchronously funcs
* [Concurrency] DispatchSerialQueue does not exist on linux still
When we locate libswiftCore.dylib in the remote process, check for failure and give up immediately if we don't find one. If the process doesn't have Swift, there's no point in trying to inspect anything in it.
rdar://143978694
