asking if a method has a hasBaselineSaveLSRegistersAnnotation triggers classloading (and thus GC) when GC is disabled during OSR

Stack trace copied from http://jikesrvm.anu.edu.au/cattrack/results/piccolo.watson.ibm.com/core-ppc64/4664/development/Opt_1/javalex/JLex.Main

We have to be able to answer this question in an uninterruptible fashion.

– Stack –
at Lorg/jikesrvm/VM; _assertionFailure(Ljava/lang/String;Ljava/lang/String;)V at line 627
at Lorg/jikesrvm/VM; _assert(ZLjava/lang/String;Ljava/lang/String;)V at line 610
at Lorg/jikesrvm/VM; _assert(Z)V at line 588
at Lorg/jikesrvm/scheduler/greenthreads/GreenProcessor; failIfThreadSwitchingDisabled()V at line 629
at Lorg/jikesrvm/scheduler/greenthreads/GreenThread; morph(Z)V at line 473
at Lorg/jikesrvm/scheduler/greenthreads/GreenThread; yield()V at line 399
at Lorg/jikesrvm/scheduler/greenthreads/GreenScheduler; yieldInternal()V at line 637
at Lorg/jikesrvm/scheduler/Scheduler; yield()V at line 280
at Lorg/jikesrvm/mm/mminterface/Handshake; requestAndAwaitCompletion(I)V at line 72
at Lorg/jikesrvm/mm/mminterface/CollectorThread; collect(Lorg/jikesrvm/mm/mminterface/Handshake;I)V at line 272
at Lorg/jikesrvm/mm/mmtk/Collection; triggerCollectionStatic(I)V at line 127
at Lorg/jikesrvm/mm/mmtk/Collection; triggerCollection(I)V at line 79
at Lorg/mmtk/plan/Plan; poll(ZLorg/mmtk/policy/Space;)Z at line 891
at Lorg/mmtk/policy/Space; acquire(I)Lorg/vmmagic/unboxed/Address; at line 397
at Lorg/mmtk/utility/alloc/BumpPointer; allocSlowOnce(III)Lorg/vmmagic/unboxed/Address; at line 263
at Lorg/mmtk/utility/alloc/Allocator; allocSlowInline(III)Lorg/vmmagic/unboxed/Address; at line 229
at Lorg/mmtk/utility/alloc/BumpPointer; allocSlow(Lorg/vmmagic/unboxed/Address;Lorg/vmmagic/unboxed/Address;II)Lorg/vmmagic/unboxed/Address; at line 172
at Lorg/mmtk/utility/alloc/BumpPointer; alloc(III)Lorg/vmmagic/unboxed/Address; at line 146
at Lorg/mmtk/plan/generational/GenMutator; alloc(IIIII)Lorg/vmmagic/unboxed/Address; at line 88
at Lorg/mmtk/plan/generational/marksweep/GenMSMutator; alloc(IIIII)Lorg/vmmagic/unboxed/Address; at line 90
at Lorg/jikesrvm/mm/mminterface/MemoryManager; allocateSpace(Lorg/jikesrvm/mm/mminterface/Selected$Mutator;IIIII)Lorg/vmmagic/unboxed/Address; at line 742
at Lorg/jikesrvm/mm/mminterface/MemoryManager; allocateArrayInternal(IILorg/jikesrvm/objectmodel/TIB;IIII)Ljava/lang/Object; at line 717
at Lorg/jikesrvm/mm/mminterface/MemoryManager; allocateArray(IIILorg/jikesrvm/objectmodel/TIB;IIII)Ljava/lang/Object; at line 683
at Lorg/jikesrvm/runtime/RuntimeEntrypoints; resolvedNewArray(IIILorg/jikesrvm/objectmodel/TIB;IIII)Ljava/lang/Object; at line 378
at Lorg/jikesrvm/classloader/UTF8Convert; toUTF8(Ljava/lang/String[B at line 322
at Lorg/jikesrvm/classloader/Atom; equals(Ljava/lang/Object;)Z at line 919
at Lorg/jikesrvm/util/ImmutableEntryHashMapRVM; same(Ljava/lang/Object;Ljava/lang/Object;)Z at line 73
at Lorg/jikesrvm/util/AbstractHashMapRVM; get(Ljava/lang/Object;)Ljava/lang/Object; at line 67
at Lorg/jikesrvm/classloader/Atom; findOrCreate([BIILjava/lang/String;)Lorg/jikesrvm/classloader/Atom; at line 171
at Lorg/jikesrvm/classloader/Atom; parseForParameterTypes(Ljava/lang/ClassLoader[Lorg/jikesrvm/classloader/TypeReference; at line 550
at Lorg/jikesrvm/classloader/MethodReference; <init>(Lorg/jikesrvm/classloader/TypeReference;Lorg/jikesrvm/classloader/Atom;Lorg/jikesrvm/classloader/Atom;I)V at line 58
at Lorg/jikesrvm/classloader/MemberReference; findOrCreate(Lorg/jikesrvm/classloader/TypeReference;Lorg/jikesrvm/classloader/Atom;Lorg/jikesrvm/classloader/Atom;)Lorg/jikesrvm/classloader/MemberReference; at line 93
at Lorg/jikesrvm/classloader/RVMClass; readClass(Lorg/jikesrvm/classloader/TypeReference;Ljava/io/DataInputStream;)Lorg/jikesrvm/classloader/RVMClass; at line 1389
at Lorg/jikesrvm/classloader/RVMClassLoader; defineClassInternal(Ljava/lang/String;Ljava/io/InputStream;Ljava/lang/ClassLoader;)Lorg/jikesrvm/classloader/RVMType; at line 336
at Lorg/jikesrvm/classloader/RVMClassLoader; defineClassInternal(Ljava/lang/String;[BIILjava/lang/ClassLoader;)Lorg/jikesrvm/classloader/RVMType; at line 307
at Ljava/lang/VMClassLoader; defineClass(Ljava/lang/ClassLoader;Ljava/lang/String;[BIILjava/security/ProtectionDomain;)Ljava/lang/Class; at line 99
at <invisible method>
at Lorg/jikesrvm/runtime/Reflection; invoke(Lorg/jikesrvm/classloader/RVMMethod;Ljava/lang/Object;[Ljava/lang/Object;Z)Ljava/lang/Object; at line 128
at Lorg/jikesrvm/runtime/Reflection; invoke(Lorg/jikesrvm/classloader/RVMMethod;Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object; at line 45
at Ljava/lang/reflect/VMCommonLibrarySupport; invokeStatic(Ljava/lang/Object;[Ljava/lang/Object;Lorg/jikesrvm/classloader/RVMMethod;Ljava/lang/reflect/Method;Lorg/jikesrvm/classloader/RVMClass;)Ljava/lang/Object; at line 202
at Ljava/lang/reflect/VMCommonLibrarySupport; invoke(Ljava/lang/Object;[Ljava/lang/Object;Lorg/jikesrvm/classloader/RVMMethod;Ljava/lang/reflect/Method;Lorg/jikesrvm/classloader/RVMClass;)Ljava/lang/Object; at line 171
at Ljava/lang/reflect/VMMethod; invoke(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object; at line 80
at Ljava/lang/reflect/Method; invoke(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object; at line 331
at Ljava/lang/reflect/Proxy$ClassFactory; generate(Ljava/lang/ClassLoader;)Ljava/lang/Class; at line 1269
at Ljava/lang/reflect/Proxy; getProxyClass(Ljava/lang/ClassLoader;[Ljava/lang/Class;)Ljava/lang/Class; at line 278
at Ljava/lang/reflect/Proxy; newProxyInstance(Ljava/lang/ClassLoader;[Ljava/lang/Class;Ljava/lang/reflect/InvocationHandler;)Ljava/lang/Object; at line 321
at Lorg/jikesrvm/classloader/RVMAnnotation; createValue()Ljava/lang/annotation/Annotation; at line 127
at Lorg/jikesrvm/classloader/RVMAnnotation; getValue()Ljava/lang/annotation/Annotation; at line 107
at Lorg/jikesrvm/classloader/AnnotatedElement; toAnnotations(Ljava/lang/Object[Ljava/lang/annotation/Annotation; at line 140
at Lorg/jikesrvm/classloader/AnnotatedElement; getDeclaredAnnotationsInternal()[Ljava/lang/annotation/Annotation; at line 105
at Lorg/jikesrvm/classloader/AnnotatedElement; getAnnotationsInternal()[Ljava/lang/annotation/Annotation; at line 90
at Lorg/jikesrvm/classloader/AnnotatedElement; getAnnotation(Ljava/lang/Class;)Ljava/lang/annotation/Annotation; at line 154
at Lorg/jikesrvm/classloader/AnnotatedElement; isAnnotationPresent(Ljava/lang/Class;)Z at line 166
at Lorg/jikesrvm/classloader/AnnotatedElement; hasBaselineSaveLSRegistersAnnotation()Z at line 296
at Lorg/jikesrvm/osr/ppc/BaselineExecutionStateExtractor; extractState(Lorg/jikesrvm/scheduler/RVMThread;Lorg/vmmagic/unboxed/Offset;Lorg/vmmagic/unboxed/Offset;I)Lorg/jikesrvm/osr/ExecutionState; at line 167
at Lorg/jikesrvm/adaptive/OnStackReplacementPlan; execute()V at line 111
at Lorg/jikesrvm/adaptive/recompilation/CompilationThread; run()V at line 57
at Lorg/jikesrvm/scheduler/RVMThread; startoff()V at line 627