From e9ff6d8bcacdc5d2727901f637614007e86f86cc Mon Sep 17 00:00:00 2001
From: Joshua Gross <joshuagross@fb.com>
Date: Wed, 31 Mar 2021 21:29:13 -0700
Subject: [PATCH] Print ShadowView hash when displaying instructions

Summary:
When displaying instructions in debug logs, also print ShadowView hash to make it easier to reconstruct a series of events.

Changelog: [Internal]

Reviewed By: mdvacca

Differential Revision: D27492938

fbshipit-source-id: 276a080a4afcfb4aa0aafc215e2ccd56ef849fcf
---
 .../animations/LayoutAnimationKeyFrameManager.cpp | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/ReactCommon/react/renderer/animations/LayoutAnimationKeyFrameManager.cpp b/ReactCommon/react/renderer/animations/LayoutAnimationKeyFrameManager.cpp
index 1300702bf0b..e30e9899f4c 100644
--- a/ReactCommon/react/renderer/animations/LayoutAnimationKeyFrameManager.cpp
+++ b/ReactCommon/react/renderer/animations/LayoutAnimationKeyFrameManager.cpp
@@ -60,8 +60,19 @@ static std::string GetMutationInstructionString(
 void PrintMutationInstruction(
     std::string message,
     ShadowViewMutation const &mutation) {
-  LOG(ERROR) << message
-             << " Mutation: " << GetMutationInstructionString(mutation);
+  [&](std::ostream &stream) -> std::ostream & {
+    stream << message
+           << " Mutation: " << GetMutationInstructionString(mutation);
+    if (mutation.oldChildShadowView.tag != 0) {
+      stream << " old hash: ##"
+             << std::hash<ShadowView>{}(mutation.oldChildShadowView);
+    }
+    if (mutation.newChildShadowView.tag != 0) {
+      stream << " new hash: ##"
+             << std::hash<ShadowView>{}(mutation.newChildShadowView);
+    }
+    return stream;
+  }(LOG(ERROR));
 }
 void PrintMutationInstructionRelative(
     std::string message,