HLE: Revamp error handling throrough the HLE code

All service calls in the CTR OS return result codes indicating the
success or failure of the call. Previous to this commit, Citra's HLE
emulation of services and the kernel universally either ignored errors
or returned dummy -1 error codes.

This commit makes an initial effort to provide an infrastructure for
error reporting and propagation which can be use going forward to make
HLE calls accurately return errors as the original system. A few parts
of the code have been updated to use the new system where applicable.

One part of this effort is the definition of the `ResultCode` type,
which provides facilities for constructing and parsing error codes in
the structured format used by the CTR.

The `ResultVal` type builds on `ResultCode` by providing a container for
values returned by function that can report errors. It enforces that
correct error checking will be done on function returns by preventing
the use of the return value if the function returned an error code.

Currently this change is mostly internal since errors are still
suppressed on the ARM<->HLE border, as a temporary compatibility hack.
As functionality is implemented and tested this hack can be eventually
removed.

1 files changed, 4 insertions, 4 deletions

diff --git a/src/core/hle/kernel/event.h b/src/core/hle/kernel/event.h
index 6add7289..6c17ed23 100644
--- a/src/core/hle/kernel/event.h
+++ b/src/core/hle/kernel/event.h
@@ -17,7 +17,7 @@ namespace Kernel {
  * @param locked Boolean locked value to set event
  * @return Result of operation, 0 on success, otherwise error code
  */
-Result SetEventLocked(const Handle handle, const bool locked);
+ResultCode SetEventLocked(const Handle handle, const bool locked);
 
 /**
  * Hackish function to set an events permanent lock state, used to pass through synch blocks
@@ -25,21 +25,21 @@ Result SetEventLocked(const Handle handle, const bool locked);
  * @param permanent_locked Boolean permanent locked value to set event
  * @return Result of operation, 0 on success, otherwise error code
  */
-Result SetPermanentLock(Handle handle, const bool permanent_locked);
+ResultCode SetPermanentLock(Handle handle, const bool permanent_locked);
 
 /**
  * Signals an event
  * @param handle Handle to event to signal
  * @return Result of operation, 0 on success, otherwise error code
  */
-Result SignalEvent(const Handle handle);
+ResultCode SignalEvent(const Handle handle);
 
 /**
  * Clears an event
  * @param handle Handle to event to clear
  * @return Result of operation, 0 on success, otherwise error code
  */
-Result ClearEvent(Handle handle);
+ResultCode ClearEvent(Handle handle);
 
 /**
  * Creates an event