overlaytopleft/games-fps/gzdoom/files/0026-Add-Missing-Read-Barriers-to-Map-Get-Functions.patch

From 7f0b52de6fcddf98dc07ca3aa1c34e8b03e0416c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ricardo=20Lu=C3=ADs=20Vaz=20Silva?= <ricolvs123@gmail.com>
Date: Wed, 18 Jan 2023 21:05:47 -0300
Subject: [PATCH 26/51] Add Missing Read Barriers to Map Get Functions

---
 src/common/scripting/core/maps.cpp | 22 ++++++++++++++++++----
 1 file changed, 18 insertions(+), 4 deletions(-)

diff --git a/src/common/scripting/core/maps.cpp b/src/common/scripting/core/maps.cpp
index bfc2b676d..b6ae925c6 100644
--- a/src/common/scripting/core/maps.cpp
+++ b/src/common/scripting/core/maps.cpp
@@ -118,8 +118,16 @@ template<typename M> unsigned int MapCountUsed(M * self)
 template<typename M> expand_types_vm<typename M::ValueType> MapGet(M * self,expand_types_vm<typename M::KeyType> key)
 {
     typename M::ValueType * v = self->CheckKey(key);
-    if (v) {
-        return *v;
+    if (v)
+    {
+        if constexpr(std::is_same_v<typename M::ValueType, DObject*>)
+        {
+            return GC::ReadBarrier(*v);
+        }
+        else
+        {
+            return *v;
+        }
     }
     else
     {
@@ -149,7 +157,6 @@ template<typename M> int MapCheckKey(M * self, expand_types_vm<typename M::KeyTy
     return self->CheckKey(key) != nullptr;
 }
 
-
 //==========================================================================
 //
 // MapInsert
@@ -240,7 +247,14 @@ template<typename I> void MapIteratorGetKeyString(I * self, FString &out)
 
 template<typename I> expand_types_vm<typename I::ValueType> MapIteratorGetValue(I * self)
 {
-    return self->GetValue();
+    if constexpr(std::is_same_v<typename I::ValueType, DObject*>)
+    {
+        return GC::ReadBarrier(self->GetValue());
+    }
+    else
+    {
+        return self->GetValue();
+    }
 }
 
 template<typename I> void MapIteratorGetValueString(I * self, FString &out)
-- 
2.39.3