> Background, from JBS: > > src/java.base/share/native/libverify/check_code.c: In function > 'read_all_code': > src/java.base/share/native/libverify/check_code.c:942:5: error: 'lengths' may > be used uninitialized [-Werror=maybe-uninitialized] > 942 | check_and_push(context, lengths, VM_MALLOC_BLK); > | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > src/java.base/share/native/libverify/check_code.c:4145:13: note: by argument > 2 of type 'const void *' to 'check_and_push' declared here > 4145 | static void check_and_push(context_type *context, const void *ptr, > int kind) > | ^~~~~~~~~~~~~~ > > > Because the second argument of check_and_push is "const void*" GCC assumes > that the malloc:ed data, which has not yet been initialized, will not be/can > not be modified later which in turn suggests it may be used without ever > being initialized. > > The same general issue was addressed in > [JDK-8266168](https://bugs.openjdk.java.net/browse/JDK-8266168), presumably > for GCC 11.1. > > > Details: > > Instead of sprinkling more calloc calls around or using pragmas/gcc > attributes I chose to change the check_and_push function to take a > (non-const) void* argument, and provide a new wrapper function > `check_and_push_const` which handles the const argument case. For the > (non-const) VM_MALLOC_BKP that means the pointer never needs to go through a > const conversion. > > To avoid having multiple ways of solving the same problem I also chose to > revert the change made in JDK-8266168, reverting the calloc back to a malloc > call. > > Testing: > > tier1 + builds-tier{2,3,4,5}
Mikael Vidstedt has updated the pull request incrementally with 50 additional commits since the last revision: - Spell out check_and_push_malloc_block - Fix code - 8282773: Refactor parsing of integer VM options Reviewed-by: dholmes, kbarrett - 8283274: Improve @jvms usage in java.base Reviewed-by: iris - 8283188: Build time regression caused by JDK-8278917 Reviewed-by: kbarrett, tschatzl - 8283320: Error message for Windows libraries always points to --with-msvcr-dll no matter the actual file name Reviewed-by: erikj, ihse - 8283056: show abstract machine code in hs-err for all VM crashes Reviewed-by: thartmann, dholmes - 8282727: Parallel: Remove PSPromotionManager::_totally_drain Reviewed-by: tschatzl, kbarrett - 8281146: Replace StringCoding.hasNegatives with countPositives Co-authored-by: Lutz Schmidt <l...@openjdk.org> Co-authored-by: Martin Doerr <mdo...@openjdk.org> Reviewed-by: kvn, lucy, rriggs - 8282602: Refactor awt classes javadoc to use @throws instead of @exception Reviewed-by: aivanov, prr - ... and 40 more: https://git.openjdk.java.net/jdk/compare/baf72097...eb04d78a ------------- Changes: - all: https://git.openjdk.java.net/jdk/pull/7794/files - new: https://git.openjdk.java.net/jdk/pull/7794/files/baf72097..eb04d78a Webrevs: - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7794&range=01 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7794&range=00-01 Stats: 5146 lines in 353 files changed: 2567 ins; 553 del; 2026 mod Patch: https://git.openjdk.java.net/jdk/pull/7794.diff Fetch: git fetch https://git.openjdk.java.net/jdk pull/7794/head:pull/7794 PR: https://git.openjdk.java.net/jdk/pull/7794
