Commit Graph

13 Commits

Author SHA1 Message Date
Lioncash
6ac955a0b4 hle/service: Default constructors and destructors in the cpp file where applicable
When a destructor isn't defaulted into a cpp file, it can cause the use
of forward declarations to seemingly fail to compile for non-obvious
reasons. It also allows inlining of the construction/destruction logic
all over the place where a constructor or destructor is invoked, which
can lead to code bloat. This isn't so much a worry here, given the
services won't be created and destroyed frequently.

The cause of the above mentioned non-obvious errors can be demonstrated
as follows:

------- Demonstrative example, if you know how the described error happens, skip forwards -------

Assume we have the following in the header, which we'll call "thing.h":

\#include <memory>

// Forward declaration. For example purposes, assume the definition
// of Object is in some header named "object.h"
class Object;

class Thing {
public:
    // assume no constructors or destructors are specified here,
    // or the constructors/destructors are defined as:
    //
    // Thing() = default;
    // ~Thing() = default;
    //

    // ... Some interface member functions would be defined here

private:
    std::shared_ptr<Object> obj;
};

If this header is included in a cpp file, (which we'll call "main.cpp"),
this will result in a compilation error, because even though no
destructor is specified, the destructor will still need to be generated by
the compiler because std::shared_ptr's destructor is *not* trivial (in
other words, it does something other than nothing), as std::shared_ptr's
destructor needs to do two things:

1. Decrement the shared reference count of the object being pointed to,
   and if the reference count decrements to zero,

2. Free the Object instance's memory (aka deallocate the memory it's
   pointing to).

And so the compiler generates the code for the destructor doing this inside main.cpp.

Now, keep in mind, the Object forward declaration is not a complete type. All it
does is tell the compiler "a type named Object exists" and allows us to
use the name in certain situations to avoid a header dependency. So the
compiler needs to generate destruction code for Object, but the compiler
doesn't know *how* to destruct it. A forward declaration doesn't tell
the compiler anything about Object's constructor or destructor. So, the
compiler will issue an error in this case because it's undefined
behavior to try and deallocate (or construct) an incomplete type and
std::shared_ptr and std::unique_ptr make sure this isn't the case
internally.

Now, if we had defaulted the destructor in "thing.cpp", where we also
include "object.h", this would never be an issue, as the destructor
would only have its code generated in one place, and it would be in a
place where the full class definition of Object would be visible to the
compiler.

---------------------- End example ----------------------------

Given these service classes are more than certainly going to change in
the future, this defaults the constructors and destructors into the
relevant cpp files to make the construction and destruction of all of
the services consistent and unlikely to run into cases where forward
declarations are indirectly causing compilation errors. It also has the
plus of avoiding the need to rebuild several services if destruction
logic changes, since it would only be necessary to recompile the single
cpp file.
2018-09-10 23:55:31 -04:00
Lioncash
0cbcd6ec9a kernel: Eliminate kernel global state
As means to pave the way for getting rid of global state within core,
This eliminates kernel global state by removing all globals. Instead
this introduces a KernelCore class which acts as a kernel instance. This
instance lives in the System class, which keeps its lifetime contained
to the lifetime of the System class.

This also forces the kernel types to actually interact with the main
kernel instance itself instead of having transient kernel state placed
all over several translation units, keeping everything together. It also
has a nice consequence of making dependencies much more explicit.

This also makes our initialization a tad bit more correct. Previously we
were creating a kernel process before the actual kernel was initialized,
which doesn't really make much sense.

The KernelCore class itself follows the PImpl idiom, which allows
keeping all the implementation details sealed away from everything else,
which forces the use of the exposed API and allows us to avoid any
unnecessary inclusions within the main kernel header.
2018-08-28 22:31:51 -04:00
Lioncash
c061c2bf3c hle/service: Make constructors explicit where applicable
Prevents implicit construction and makes these lingering non-explicit
constructors consistent with the rest of the other classes in services.
2018-07-19 12:25:02 -04:00
James Rowe
638956aa81 Rename logging macro back to LOG_* 2018-07-02 21:45:47 -04:00
mailwl
61fbf5c8e6 Stub IUser::AttachAvailabilityChangeEvent 2018-06-06 19:05:11 +03:00
mailwl
bb081dd1d2 Correct function results 2018-06-04 14:43:02 +03:00
mailwl
019778707d Service/nfp:user : stub some functions.
Used by Zelda: BoTW
2018-06-04 12:39:43 +03:00
Hexagon12
0984e9d601 Updated nfp with more service names 2018-05-13 13:08:58 +03:00
David Marcec
abc23416e8 Switched to NGLOG_WARNING 2018-04-26 20:03:12 -07:00
David Marcec
27650499bc GetIUserInterface->CreateUserInterface, Added todos and stub logs. Playreport->PlayReport. 2018-04-22 19:02:18 -07:00
David Marcec
f3137d3bc1 Implemented GetIUserInterface properly, Playreport and SSL::SetInterfaceVersion. Fixed ipc issues with IAudioDevice(wrong ids) 2018-04-21 22:04:24 -07:00
Lioncash
ccca5e7c28 service: Use nested namespace specifiers where applicable
Tidies up namespace declarations
2018-04-19 22:20:28 -04:00
bunnei
deaf6f9e35 service: Add NFP module interface.
service: Initialize NFP service.

Log: Add NFP service as a log subtype.
2018-03-29 21:22:44 -04:00