kotlin-fork/compiler/ir/backend.jvm/LockPriority.md

Priority of locks in parallel runs of the JVM IR backend

To avoid deadlocks in backend code, please make sure that a lock that comes earlier in the list never gets acquired by a thread that already holds one of the locks that come later.

1. JvmBackendContext.inlineMethodGenerationLock. Used to prevent concurrent generation of inline functions.
2. Global IrLock instance. Used in SymbolTable, lazyVar instances in IrLazyDeclaration, Fir2IrLazyDeclaration subclasses, Fir2IrDeclarationStorage.
3. • lock in ClassBuilderAndSourceFileList.asBytes.
   • lock on methodNode in InlineCodegen.cloneMethodNode.
   • Locks protecting InlineCache maps.