From a8703e65d818ad4d51e26d7b5826539cbd3e1c81 Mon Sep 17 00:00:00 2001
From: Andrew Clark <acdlite@fb.com>
Date: Thu, 17 Nov 2016 13:11:16 +0000
Subject: [PATCH] Switch over primary effect types only

This avoids the need to create an export for every combination of bits.
---
 .../shared/fiber/ReactFiberScheduler.js       | 43 ++++++-------------
 .../shared/fiber/ReactTypeOfSideEffect.js     | 17 +-------
 2 files changed, 13 insertions(+), 47 deletions(-)

diff --git a/src/renderers/shared/fiber/ReactFiberScheduler.js b/src/renderers/shared/fiber/ReactFiberScheduler.js
index d3e0c976c2875..272ebe09f91b2 100644
--- a/src/renderers/shared/fiber/ReactFiberScheduler.js
+++ b/src/renderers/shared/fiber/ReactFiberScheduler.js
@@ -41,19 +41,7 @@ var {
   PlacementAndUpdate,
   Deletion,
   Callback,
-  PlacementAndCallback,
-  UpdateAndCallback,
-  PlacementAndUpdateAndCallback,
-  DeletionAndCallback,
   Err,
-  PlacementAndErr,
-  UpdateAndErr,
-  PlacementAndUpdateAndErr,
-  DeletionAndErr,
-  PlacementAndCallbackAndErr,
-  UpdateAndCallbackAndErr,
-  PlacementAndUpdateAndCallbackAndErr,
-  DeletionAndCallbackAndErr,
 } = require('ReactTypeOfSideEffect');
 
 var {
@@ -173,44 +161,37 @@ module.exports = function<T, P, I, TI, C>(config : HostConfig<T, P, I, TI, C>) {
     // ref unmounts.
     let effectfulFiber = finishedWork.firstEffect;
     while (effectfulFiber) {
-      switch (effectfulFiber.effectTag) {
-        case Placement:
-        case PlacementAndCallback:
-        case PlacementAndErr:
-        case PlacementAndCallbackAndErr: {
+      // The following switch statement is only concerned about placement,
+      // updates, and deletions. To avoid needing to add a case for every
+      // possible bitmap value, we remove the secondary effects from the
+      // effect tag and switch on that value.
+      let primaryEffectTag = effectfulFiber.effectTag & ~(Callback | Err);
+      switch (primaryEffectTag) {
+        case Placement: {
           commitInsertion(effectfulFiber);
           // Clear the "placement" from effect tag so that we know that this is inserted, before
           // any life-cycles like componentDidMount gets called.
-          effectfulFiber.effectTag ^= Placement;
+          effectfulFiber.effectTag &= ~Placement;
           break;
         }
-        case PlacementAndUpdate:
-        case PlacementAndUpdateAndCallback:
-        case PlacementAndUpdateAndErr:
-        case PlacementAndUpdateAndCallbackAndErr: {
+        case PlacementAndUpdate: {
           // Placement
           commitInsertion(effectfulFiber);
           // Clear the "placement" from effect tag so that we know that this is inserted, before
           // any life-cycles like componentDidMount gets called.
-          effectfulFiber.effectTag ^= Placement;
+          effectfulFiber.effectTag &= ~Placement;
 
           // Update
           const current = effectfulFiber.alternate;
           commitWork(current, effectfulFiber);
           break;
         }
-        case Update:
-        case UpdateAndErr:
-        case UpdateAndCallback:
-        case UpdateAndCallbackAndErr: {
+        case Update: {
           const current = effectfulFiber.alternate;
           commitWork(current, effectfulFiber);
           break;
         }
-        case Deletion:
-        case DeletionAndCallback:
-        case DeletionAndErr:
-        case DeletionAndCallbackAndErr: {
+        case Deletion: {
           commitDeletion(effectfulFiber);
           break;
         }
diff --git a/src/renderers/shared/fiber/ReactTypeOfSideEffect.js b/src/renderers/shared/fiber/ReactTypeOfSideEffect.js
index 0fe4b468918fc..f8dc19407c8d3 100644
--- a/src/renderers/shared/fiber/ReactTypeOfSideEffect.js
+++ b/src/renderers/shared/fiber/ReactTypeOfSideEffect.js
@@ -12,9 +12,7 @@
 
 'use strict';
 
-export type TypeOfSideEffect =
-  0 | 1 | 2 | 3 | 4 | 8 | 9 | 10 | 11 | 12 | 16 | 17 | 18 | 19 | 20 | 24 | 25 |
-  26 | 27 | 28;
+export type TypeOfSideEffect = 0 | 1 | 2 | 3 | 4 | 8 | 16;
 
 module.exports = {
   NoEffect: 0,                                // 0b00000
@@ -23,18 +21,5 @@ module.exports = {
   PlacementAndUpdate: 3,                      // 0b00011
   Deletion: 4,                                // 0b00100
   Callback: 8,                                // 0b01000
-  PlacementAndCallback: 9,                    // 0b01001
-  UpdateAndCallback: 10,                      // 0b01010
-  PlacementAndUpdateAndCallback: 11,          // 0b01011
-  DeletionAndCallback: 12,                    // 0b01100
   Err: 16,                                    // 0b10000
-  PlacementAndErr: 17,                        // 0b10001
-  UpdateAndErr: 18,                           // 0b10010
-  PlacementAndUpdateAndErr: 19,               // 0b10011
-  DeletionAndErr: 20,                         // 0b10100
-  CallbackAndErr: 24,                         // 0b11000
-  PlacementAndCallbackAndErr: 25,             // 0b11001
-  UpdateAndCallbackAndErr: 26,                // 0b11010
-  PlacementAndUpdateAndCallbackAndErr: 27,    // 0b11011
-  DeletionAndCallbackAndErr: 28,              // 0b11100
 };