> Please review this change re-implementing the FieldInfo data structure. > > The FieldInfo array is an old data structure storing fields metadata. It has > poor extension capabilities, a complex management code because of lack of > strong typing and semantic overloading, and a poor memory efficiency. > > The new implementation uses a compressed stream to store those metadata, > achieving better memory density and providing flexible extensibility, while > exposing a strongly typed set of data when uncompressed. The stream is > compressed using the unsigned5 encoding, which alreay present in the JDK > (because of pack200) and the JVM (because JIT compulers use it to comrpess > debugging information). > > More technical details are available in the CR: > https://bugs.openjdk.org/browse/JDK-8292818 > > Those changes include a re-organisation of fields' flags, splitting the > previous heterogeneous AccessFlags field into three distincts flag > categories: immutable flags from the class file, immutable fields defined by > the JVM, and finally mutable flags defined by the JVM. > > The SA, CI, and JVMCI, which all used to access the old FieldInfo array, have > been updated too to deal with the new FieldInfo format. > > Tested with mach5, tier 1 to 7. > > Thank you.
Frederic Parain has updated the pull request incrementally with one additional commit since the last revision: SA and JVMCI fixes ------------- Changes: - all: https://git.openjdk.org/jdk/pull/12855/files - new: https://git.openjdk.org/jdk/pull/12855/files/12b4f1b4..f81337f7 Webrevs: - full: https://webrevs.openjdk.org/?repo=jdk&pr=12855&range=04 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=12855&range=03-04 Stats: 130 lines in 13 files changed: 14 ins; 46 del; 70 mod Patch: https://git.openjdk.org/jdk/pull/12855.diff Fetch: git fetch https://git.openjdk.org/jdk pull/12855/head:pull/12855 PR: https://git.openjdk.org/jdk/pull/12855
