In the Throwable::printStackTrace method, StringBuilder is created multiple times to build String. By sharing StringBuilder to build String, object allocation and copying are reduced.
In the scenario without suppressed and ourCause, unused IdentityHashMap is not created. Through these optimizations, the performance of `new Exception().printStackTrace()` can be improved by about 10%. ------------- Commit messages: - lineBuffer, from @liach - bug fix - bug fix - from @liach - Update src/java.base/share/classes/java/lang/Throwable.java - from @liach - Remove redundant toString - from @liach - from @liach - from @liach - ... and 2 more: https://git.openjdk.org/jdk/compare/82c24944...a68c6932 Changes: https://git.openjdk.org/jdk/pull/24864/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24864&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8355636 Stats: 252 lines in 3 files changed: 223 ins; 8 del; 21 mod Patch: https://git.openjdk.org/jdk/pull/24864.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/24864/head:pull/24864 PR: https://git.openjdk.org/jdk/pull/24864
