RFR: 8316694: Implement relocation of nmethod within CodeCache [v4]

[Evgeny Astigeevich]

On Mon, 17 Mar 2025 20:33:09 GMT, Chad Rakoczy <duke at openjdk.org> wrote:

>> make/hotspot/lib/CompileJvm.gmk line 201:
>> 
>>> 199:     DISABLED_WARNINGS_gcc_jvmtiTagMap.cpp := stringop-overflow, \
>>> 200:     DISABLED_WARNINGS_gcc_macroAssembler_ppc_sha.cpp := unused-const-variable, \
>>> 201:     DISABLED_WARNINGS_gcc_nmethod.cpp := class-memaccess, \
>> 
>> Why you need this?
>
> Without I get the following error
> 
> error: ‘void* memcpy(void*, const void*, size_t)’ writing to an object of non-trivially copyable type ‘class nmethod’; use copy-assignment or copy-initialization instead [-Werror=class-memaccess]

@chadrako See https://en.cppreference.com/w/cpp/language/classes#Trivially_copyable_class

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PR Review Comment: https://git.openjdk.org/jdk/pull/23573#discussion_r1999721739