RFR: 8352420: [ubsan] codeBuffer.cpp:984:27: runtime error: applying non-zero offset 18446744073709486080 to null pointer [v2]

[Vladimir Kozlov]

On Thu, 20 Mar 2025 20:06:49 GMT, Doug Simon <dnsimon at openjdk.org> wrote:

>> This PR addresses undefined behavior in CodeBuffer by making `verify_section_allocation` return early for a partially initialized CodeBuffer.
>
> Doug Simon has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - initialize _total_start with nullptr instead of 0
>  - moved initialization of _total_start and _total_size

And you don't need them in [initialize(address code_start, csize_t code_size)](https://github.com/openjdk/jdk/blob/master/src/hotspot/share/asm/codeBuffer.hpp#L487)

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PR Review: https://git.openjdk.org/jdk/pull/24118#pullrequestreview-2704068027