> The JDK codebase re-created many variants of checkIndex(`grep -I -r > 'cehckIndex' jdk/`). A notable variant is java.nio.Buffer.checkIndex, which > annotated with @IntrinsicCandidate and it only has a corresponding C1 > intrinsic version. > > In fact, there is an utility method > `jdk.internal.util.Preconditions.checkIndex`(wrapped by > java.lang.Objects.checkIndex) that behaves the same as these variants of > checkIndex, we can replace these re-created variants of checkIndex by > Objects.checkIndex, it would significantly reduce duplicated code and enjoys > performance improvement because Preconditions.checkIndex is > @IntrinsicCandidate and it has a corresponding intrinsic method in HotSpot. > > But, the problem is currently HotSpot only implements the C2 version of > Preconditions.checkIndex. To reuse it global-widely in JDK code, I think we > can firstly implement its C1 counterpart. There are also a few kinds of stuff > we can do later: > > 1. Replace all variants of checkIndex by Objects.checkIndex in the whole JDK > codebase. > 2. Remove Buffer.checkIndex and obsolete/deprecate InlineNIOCheckIndex flag > > Testing: cds, compiler and jdk
Yi Yang has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains eight commits: - x86_32 fails - build failed - cmp clobbers its left argument on x86_32 - better check1-4 - AssertionError when expected exception was not thrown - remove InlineNIOCheckIndex flag - remove java_nio_Buffer in javaClasses.hpp - consolidate ------------- Changes: https://git.openjdk.java.net/jdk/pull/3615/files Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3615&range=10 Stats: 338 lines in 11 files changed: 242 ins; 78 del; 18 mod Patch: https://git.openjdk.java.net/jdk/pull/3615.diff Fetch: git fetch https://git.openjdk.java.net/jdk pull/3615/head:pull/3615 PR: https://git.openjdk.java.net/jdk/pull/3615
