JDK-8038418 : New tests development for type profiling and speculation
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: compiler
  • Affected Version: 8
  • Priority: P2
  • Status: Resolved
  • Resolution: Fixed
  • Submitted: 2013-10-22
  • Updated: 2014-07-29
  • Resolved: 2014-04-11
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JDK 8 JDK 9
8u20Fixed 9 b11Fixed
Related Reports
Blocks :  
JDK-8039597 - WhiteBox :: clean type profiling data
Relates :  
JDK-8039975 - SIGSEGV in MethodData::next_data(ProfileData*)
Description
New tests should be created to cover new type profiling points added by JDK-8026251, JDK-8023657, JDK-8026054 and type speculation by JDK-8024070.
These changes add type profiling for:
 1. reference parameters on method entries (JDK-8026251),
 2. reference arguments at an invoke (JDK-8023657),
 3. return values of reference types from an invoke (JDK-8026054).

The speculative types are used for:
 1. checkcast, instanceof, aastore
 2. receiver at invokes
 3. System.arraycopy()
 4. Class.isInstance()
 5. patterns of the form: if (a.getClass() == D.class)