Integrated: 8306842: Classfile API performance improvements

[Adam Sotona]

On Wed, 26 Apr 2023 15:04:50 GMT, Adam Sotona <asotona at openjdk.org> wrote:

> Following improvements implemented:
> - Switch over `String` replaced with switch single char
> - Binary search for frames in `StackMapGenerator`
> - `StackMapGenerator.rawHandlers` with pre-calculated offsets
> - `ClassEntry` is caching `ClassDesc` symbol
> - Caching of type symbols in `NameAndTypeEntry` and `MethodTypeEntry`
> - Caching `MethodTypeDesc` in `MethodInfo` implementations
> - `StackMapGenerator` and `Utils` delegating to cached `MethodTypeDesc` instead of custom parsing
> 
> No API change.
> 
> Benchmarks show stack map generation improved by 21% and code generation from symbols improved by 30%.
> 
> 
> Benchmark                     Mode  Cnt       Score       Error  Units
> GenerateStackMaps.benchmark  thrpt   10  407931.202 ± 13101.023  ops/s
> RebuildMethodBodies.shared   thrpt    4   10258.597 ±   383.699  ops/s
> RebuildMethodBodies.unshared thrpt    4    7224.543 ±   256.800  ops/s
> 
> 
> 
> Benchmark                     Mode  Cnt       Score      Error  Units
> GenerateStackMaps.benchmark  thrpt   10  495101.110 ± 2389.628  ops/s
> RebuildMethodBodies.shared    thrpt   4   13380.272 ±  810.113  ops/s
> RebuildMethodBodies.unshared  thrpt   4    9399.863 ±  557.060  ops/s

This pull request has now been integrated.

Changeset: f4f5542f
Author:    Adam Sotona <asotona at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/f4f5542f8d49dbb756f52a281b745c3c2bbc9829
Stats:     589 lines in 28 files changed: 383 ins; 90 del; 116 mod

8306842: Classfile API performance improvements

Reviewed-by: redestad

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PR: https://git.openjdk.org/jdk/pull/13671