AOT cache uses pointer compression to store 64-bit pointers in 32 bits. Currently the compression algorithm is simply (base + narrowPtr). However, in [JDK-8376125](https://bugs.openjdk.org/browse/JDK-8376125), we may change it to (base + narrowPtr << 3).
This RFE changed the encoded pointer from an u4 to (thanks to @jdksjolen for the idea): enum class narrowPtr : u4; This allows better tracking of where the encoded pointers are stored. Also, we can distinguish between byte offsets vs encoded pointers -- they currently have the same numerical values but after [JDK-8376125](https://bugs.openjdk.org/browse/JDK-8376125), they will be different. Also minor clean up in ArchiveBuilder to change some `uintx` to `size_t`, which is used by `pointer_delta()`. ------------- Commit messages: - more clean up - updated filemap to use narrowPtr - clean up - Use: enum class narrowPtr : u4; - step6 - step5 - step4 - step3 - step2 - step1 Changes: https://git.openjdk.org/jdk/pull/29590/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=29590&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8377307 Stats: 471 lines in 26 files changed: 234 ins; 96 del; 141 mod Patch: https://git.openjdk.org/jdk/pull/29590.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/29590/head:pull/29590 PR: https://git.openjdk.org/jdk/pull/29590
