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.

6 files changed, 9 insertions, 0 deletions

diff --git a/src/core/hle/service/spl/csrng.cpp b/src/core/hle/service/spl/csrng.cpp
index b9e6b799d..674928798 100644
--- a/src/core/hle/service/spl/csrng.cpp
+++ b/src/core/hle/service/spl/csrng.cpp
@@ -13,4 +13,6 @@ CSRNG::CSRNG(std::shared_ptr<Module> module) : Module::Interface(std::move(modul
     RegisterHandlers(functions);
 }
 
+CSRNG::~CSRNG() = default;
+
 } // namespace Service::SPL
diff --git a/src/core/hle/service/spl/csrng.h b/src/core/hle/service/spl/csrng.h
index 3f849b5a7..764d5ceb0 100644
--- a/src/core/hle/service/spl/csrng.h
+++ b/src/core/hle/service/spl/csrng.h
@@ -11,6 +11,7 @@ namespace Service::SPL {
 class CSRNG final : public Module::Interface {
 public:
     explicit CSRNG(std::shared_ptr<Module> module);
+    ~CSRNG() override;
 };
 
 } // namespace Service::SPL
diff --git a/src/core/hle/service/spl/module.cpp b/src/core/hle/service/spl/module.cpp
index 3f5a342a7..0d8441fb1 100644
--- a/src/core/hle/service/spl/module.cpp
+++ b/src/core/hle/service/spl/module.cpp
@@ -16,6 +16,8 @@ namespace Service::SPL {
 Module::Interface::Interface(std::shared_ptr<Module> module, const char* name)
     : ServiceFramework(name), module(std::move(module)) {}
 
+Module::Interface::~Interface() = default;
+
 void Module::Interface::GetRandomBytes(Kernel::HLERequestContext& ctx) {
     IPC::RequestParser rp{ctx};
 
diff --git a/src/core/hle/service/spl/module.h b/src/core/hle/service/spl/module.h
index f24d998e8..48fda6099 100644
--- a/src/core/hle/service/spl/module.h
+++ b/src/core/hle/service/spl/module.h
@@ -13,6 +13,7 @@ public:
     class Interface : public ServiceFramework<Interface> {
     public:
         explicit Interface(std::shared_ptr<Module> module, const char* name);
+        ~Interface() override;
 
         void GetRandomBytes(Kernel::HLERequestContext& ctx);
 
diff --git a/src/core/hle/service/spl/spl.cpp b/src/core/hle/service/spl/spl.cpp
index bb1e03342..70cb41905 100644
--- a/src/core/hle/service/spl/spl.cpp
+++ b/src/core/hle/service/spl/spl.cpp
@@ -42,4 +42,6 @@ SPL::SPL(std::shared_ptr<Module> module) : Module::Interface(std::move(module),
     RegisterHandlers(functions);
 }
 
+SPL::~SPL() = default;
+
 } // namespace Service::SPL
diff --git a/src/core/hle/service/spl/spl.h b/src/core/hle/service/spl/spl.h
index 69c4c1747..3637d1623 100644
--- a/src/core/hle/service/spl/spl.h
+++ b/src/core/hle/service/spl/spl.h
@@ -11,6 +11,7 @@ namespace Service::SPL {
 class SPL final : public Module::Interface {
 public:
     explicit SPL(std::shared_ptr<Module> module);
+    ~SPL() override;
 };
 
 } // namespace Service::SPL