Merge pull request #63652 from apple/rokhinip/88093007-remove-dead-code-compatibility

Remove dead code around the Deadline Task Status record from the compatibility library

Author: rokhinip

stdlib/toolchain/Compatibility56/CompatibilityOverrideConcurrency.def

@@ -343,7 +343,10 @@ OVERRIDE_TASK_STATUS(task_escalate, JobPriority,
                      swift::, (AsyncTask *task, JobPriority newPriority),
                      (task, newPriority))
 
-OVERRIDE_TASK_STATUS(task_getNearestDeadline, NearestTaskDeadline,
+/// We need to keep this entry due to ABI requirements but this overrideable
+/// function is not used at all so we will change the function definition to
+/// return void instead.
+OVERRIDE_TASK_STATUS(task_getNearestDeadline, void,
                      SWIFT_EXPORT_FROM(swift_Concurrency), SWIFT_CC(swift),
                      swift::, (AsyncTask *task), (task))
 

stdlib/toolchain/Compatibility56/include/Concurrency/TaskStatus.h

@@ -76,22 +76,6 @@ class TaskStatusRecord {
   void spliceParent(TaskStatusRecord *newParent) { Parent = newParent; }
 };
 
-/// A deadline for the task.  If this is reached, the task will be
-/// automatically cancelled.  The deadline can also be queried and used
-/// in other ways.
-struct TaskDeadline {
-  // FIXME: I don't really know what this should look like right now.
-  // It's probably target-specific.
-  uint64_t Value;
-
-  bool operator==(const TaskDeadline &other) const {
-    return Value == other.Value;
-  }
-  bool operator<(const TaskDeadline &other) const {
-    return Value < other.Value;
-  }
-};
-
 /// A status record which states that a task has one or
 /// more active child tasks.
 class ChildTaskStatusRecord : public TaskStatusRecord {

stdlib/toolchain/Compatibility56/include/Runtime/Concurrency.h

@@ -51,24 +51,6 @@ struct AsyncTaskAndContext {
   AsyncContext *InitialContext;
 };
 
-/// This should have the same representation as an enum like this:
-///    enum NearestTaskDeadline {
-///      case none
-///      case alreadyCancelled
-///      case active(TaskDeadline)
-///    }
-/// TODO: decide what this interface should really be.
-struct NearestTaskDeadline {
-  enum Kind : uint8_t {
-    None,
-    AlreadyCancelled,
-    Active
-  };
-
-  TaskDeadline Value;
-  Kind ValueKind;
-};
-
 
 /// Caution: not all future-initializing functions actually throw, so
 /// this signature may be incorrect.