JDK-8219579 : Remove redundant signature parsing from the verifier
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: runtime
  • Affected Version: 13
  • Priority: P4
  • Status: Resolved
  • Resolution: Fixed
  • Submitted: 2019-02-22
  • Updated: 2021-07-16
  • Resolved: 2019-03-14
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JDK 13
13 b13Fixed
Related Reports
Relates :  
JDK-8270837 - fix typos in test TestSigParse.java
Relates :  
JDK-8059357 - ClassVerifier redundantly checks constant pool entries multiple times
Description
Both ClassFileParser and the split verifier check that field and method signatures, found in constant pool NameAndType entries, are valid.  The redundant checks should be removed from the verifier.
Comments
On a selection of small to medium startup tests, this removes about 5-10% of instructions retired in Verifier::verify when instrumenting , with a statistically significant improvement in number of instructions executed ranging from 0.1-0.5% on the total when benchmarking. Wallclock improvements are typically in the noise in most tests, but all metrics point in the right direction.
07-03-2019