挂起函数/方法在kotlin的引擎盖下是如何工作的?

这个问题的目的是了解悬挂方法是如何在引擎盖下工作的,以及 IntrinsicsKt.getCOROUTINE_SUSPENDED(); ?

在下面的字节码中,您将看到一段代码

if (var10000.resultingBlockingOp-IoAF18A((Continuation)$continuation) == var4) {
               return var4;
            }

其中var4是

Object var4 = IntrinsicsKt.getCOROUTINE_SUSPENDED();

如果函数返回,那么协程将如何执行?

在 invokeSuspend 方法,这是否意味着挂起方法在后台通过递归工作?

class CoroutineExplanatoryUseCase {
    private val coroutineExplanatoryRepo: CoroutineExplanatoryRepo = CoroutineExplanatoryRepo()

    suspend fun simpleOp() {
        coroutineExplanatoryRepo.simpleBlockingOp()
    }

    suspend fun resultingBlockingOp() {
        coroutineExplanatoryRepo.resultingBlockingOp()
    }

}

生成的字节码

public final class CoroutineExplanatoryUseCase {
   private final CoroutineExplanatoryRepo coroutineExplanatoryRepo = new CoroutineExplanatoryRepo();

   @Nullable
   public final Object simpleOp(@NotNull Continuation $completion) {
      Object var10000 = this.coroutineExplanatoryRepo.simpleBlockingOp($completion);
      return var10000 == IntrinsicsKt.getCOROUTINE_SUSPENDED() ? var10000 : Unit.INSTANCE;
   }

   @Nullable
   public final Object resultingBlockingOp(@NotNull Continuation var1) {
      Object $continuation;
      label20: {
         if (var1 instanceof <undefinedtype>) {
            $continuation = (<undefinedtype>)var1;
            if ((((<undefinedtype>)$continuation).label & Integer.MIN_VALUE) != 0) {
               ((<undefinedtype>)$continuation).label -= Integer.MIN_VALUE;
               break label20;
            }
         }

         $continuation = new ContinuationImpl(var1) {
            // $FF: synthetic field
            Object result;
            int label;

            @Nullable
            public final Object invokeSuspend(@NotNull Object $result) {
               this.result = $result;
               this.label |= Integer.MIN_VALUE;
               return CoroutineExplanatoryUseCase.this.resultingBlockingOp(this);
            }
         };
      }

      Object $result = ((<undefinedtype>)$continuation).result;
      Object var4 = IntrinsicsKt.getCOROUTINE_SUSPENDED();
      switch (((<undefinedtype>)$continuation).label) {
         case 0:
            ResultKt.throwOnFailure($result);
            CoroutineExplanatoryRepo var10000 = this.coroutineExplanatoryRepo;
            ((<undefinedtype>)$continuation).label = 1;
            if (var10000.resultingBlockingOp-IoAF18A((Continuation)$continuation) == var4) {
               return var4;
            }
            break;
         case 1:
            ResultKt.throwOnFailure($result);
            ((Result)$result).unbox-impl();
            break;
         default:
            throw new IllegalStateException("call to 'resume' before 'invoke' with coroutine");
      }

      return Unit.INSTANCE;
   }
}