[llvm] 1ea8d12 - [ORC] Add missing lock to CompileOnDemandLayer::getPerDylibResources.

[Lang Hames via llvm-commits]

Author: Lang Hames
Date: 2021-09-26T18:35:58-07:00
New Revision: 1ea8d12510b9e1b208a7541c86e1b02a9a3db0e2

URL: https://github.com/llvm/llvm-project/commit/1ea8d12510b9e1b208a7541c86e1b02a9a3db0e2
DIFF: https://github.com/llvm/llvm-project/commit/1ea8d12510b9e1b208a7541c86e1b02a9a3db0e2.diff

LOG: [ORC] Add missing lock to CompileOnDemandLayer::getPerDylibResources.

The getPerDylibResources method may be called concurrently from multiple
threads, so we need to protect access to the underlying map.

Possible for fix https://llvm.org/PR51064

Added: 
    

Modified: 
    llvm/lib/ExecutionEngine/Orc/CompileOnDemandLayer.cpp

Removed: 
    


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diff  --git a/llvm/lib/ExecutionEngine/Orc/CompileOnDemandLayer.cpp b/llvm/lib/ExecutionEngine/Orc/CompileOnDemandLayer.cpp
index 5b73c0e2fbc8..9ff6cec8c6c5 100644
--- a/llvm/lib/ExecutionEngine/Orc/CompileOnDemandLayer.cpp
+++ b/llvm/lib/ExecutionEngine/Orc/CompileOnDemandLayer.cpp
@@ -184,6 +184,8 @@ void CompileOnDemandLayer::emit(
 
 CompileOnDemandLayer::PerDylibResources &
 CompileOnDemandLayer::getPerDylibResources(JITDylib &TargetD) {
+  std::lock_guard<std::mutex> Lock(CODLayerMutex);
+
   auto I = DylibResources.find(&TargetD);
   if (I == DylibResources.end()) {
     auto &ImplD =