8331298: avoid alignment checks in UBSAN enabled build

[MBaesken]

Currently we run into some alignment related issues when building with '--enable-ubsan' . Those errors already occur in the build. Fixing them might take some time and maybe also some discussion if it is worth the effort ,
So for now the alignment related checks should be disabled to get the UBSAN build working.
Example :

/jdk/src/hotspot/cpu/x86/macroAssembler_x86.hpp:128:13: runtime error: store to misaligned address 0x15099c3cf4ce for type 'int', which requires 4 byte alignment
0x15099c3cf4ce: note: pointer points here
00 80 0f 86 00 00 00 00 3d 06 00 00 80 76 60 3d 07 00 00 80 76 40 3d 08 00 00 80 76 20 3d 1e 00
^
#0 0x1509b3b04f10 in MacroAssembler::pd_patch_instruction(unsigned char*, unsigned char*, char const*, int) /jdk/src/hotspot/cpu/x86/macroAssembler_x86.hpp:128
#1 0x1509b3b04f10 in Label::patch_instructions(MacroAssembler*) /jdk/src/hotspot/share/asm/assembler.cpp:201
#2 0x1509b940b6d8 in VM_Version_StubGenerator::generate_get_cpu_info() /jdk/src/hotspot/cpu/x86/vm_version_x86.cpp:381
#3 0x1509b94059bd in VM_Version::initialize() /jdk/src/hotspot/cpu/x86/vm_version_x86.cpp:2138
#4 0x1509b93fb56e in VM_Version_init() /jdk/src/hotspot/share/runtime/vm_version.cpp:32
#5 0x1509b61ef947 in init_globals() /jdk/src/hotspot/share/runtime/init.cpp:126
#6 0x1509b8fb0e29 in Threads::create_vm(JavaVMInitArgs*, bool*) /jdk/src/hotspot/share/runtime/threads.cpp:553
#7 0x1509b67da3d7 in JNI_CreateJavaVM_inner /jdk/src/hotspot/share/prims/jni.cpp:3581
#8 0x1509b67da3d7 in JNI_CreateJavaVM /jdk/src/hotspot/share/prims/jni.cpp:3672
#9 0x1509c0eed957 in InitializeJVM /jdk/src/java.base/share/native/libjli/java.c:1550
#10 0x1509c0eed957 in JavaMain /jdk/src/java.base/share/native/libjli/java.c:491
... (rest of output omitted)

---

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Issue

• JDK-8331298: avoid alignment checks in UBSAN enabled build (Bug - P4)

Reviewers

• Erik Joelsson (@erikj79 - Reviewer)
• Martin Doerr (@TheRealMDoerr - Reviewer)

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[bridgekeeper]

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[openjdk]

@MBaesken This change now passes all automated pre-integration checks.

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8331298: avoid alignment checks in UBSAN enabled build

Reviewed-by: erikj, mdoerr

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[mlbridge]

Webrevs

• 00: Full (606638c1)

[TheRealMDoerr]

I wish we could fix all UB, but that seems unrealistic for the time being. LGTM.

[MBaesken]

Thanks for the reviews !

/integrate

[openjdk]

Going to push as commit 60b61e5.
Since your change was applied there have been 7 commits pushed to the master branch:

• b128bd7: 8331021: Deprecate and then obsolete the DontYieldALot flag
• 819f3d6: 8330748: ByteArrayOutputStream.writeTo(OutputStream) pins carrier
• eb88343: 8331164: createJMHBundle.sh download jars fail when url needed to be redirected
• 9b423a8: 8330253: Remove verify_consistent_lock_order
• 4e42294: 8329004: Update Libpng to 1.6.43
• bdcc240: 8331087: Move immutable nmethod data from CodeCache
• 8b8fb64: 8324776: runtime/os/TestTransparentHugePageUsage.java fails with The usage of THP is not enough

Your commit was automatically rebased without conflicts.

[openjdk]

@MBaesken Pushed as commit 60b61e5.

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