JDK-8172970 : TESTBUG: need test coverage for the JVMTI functions allowed in the start phase
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: jvmti
  • Affected Version: 9
  • Priority: P2
  • Status: Resolved
  • Resolution: Fixed
  • OS: generic
  • CPU: generic
  • Submitted: 2017-01-18
  • Updated: 2019-09-09
  • Resolved: 2017-05-03
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JDK 10
10 b21Fixed
Related Reports
Relates :  
JDK-8172261 - [JVMTI] Specification for early VM start event needs to lower expectations in relation to class loading
Relates :  
JDK-8146454 - Add support for module aware agents
Relates :  
JDK-8214105 - [TESTBUG] Bit test is always false in serviceability/jvmti/StartPhase/AllowedFunctions
Description
It was discovered in the review of the 8172261 that there are no test coverage for the JVM TI functions allowed in the start phase. It is especially important to have such coverage for the early start phase when the can_generate_early_vmstart capability was possessed.
Comments
The following JVMTI spec fragment lists the functions that operate in the start phase. The following functions operate in the start or live phases: GetCurrentThread SetThreadLocalStorage GetThreadLocalStorage GetTag SetTag GetClassSignature GetClassStatus GetSourceFileName GetClassModifiers GetClassMethods GetClassFields GetImplementedInterfaces GetClassVersionNumbers GetConstantPool IsInterface IsArrayClass IsModifiableClass GetClassLoader GetSourceDebugExtension GetObjectSize GetObjectHashCode GetFieldName GetFieldDeclaringClass GetFieldModifiers IsFieldSynthetic GetMethodName GetMethodDeclaringClass GetMethodModifiers GetMaxLocals GetArgumentsSize GetLineNumberTable GetMethodLocation GetBytecodes IsMethodNative IsMethodSynthetic IsMethodObsolete SetJNIFunctionTable GetJNIFunctionTable GetCurrentThreadCpuTimerInfo GetCurrentThreadCpuTime It would be enough to cover most of the functions above, not necessarily all of them. I think, it is Ok to not cover the following functions from the above list: SetJNIFunctionTable GetJNIFunctionTable GetCurrentThreadCpuTimerInfo GetCurrentThreadCpuTime GetSourceDebugExtension GetImplementedInterfaces GetClassVersionNumbers GetConstantPool GetClassLoader GetTag SetTag GetObjectSize GetObjectHashCode GetLineNumberTable GetMethodLocation GetBytecodes The functions that operate in any phase do not have to be covered by this enhancement.
03-05-2017