Bytecode cache: compile-time layout asserts (replacing the layout dump); canonical NaN constants - #521

Merged

dylan-conway merged 8 commits into

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claude/bytecode-layout-check

Aug 27, 2026

Commits on Aug 27, 2026

CI: compare bytecode cache record layouts in their own job, from per-build layout artifacts
dylan-conway
committed
e537f3e
CachedTypes.cpp: -Wms-bitfield-padding as an error, so a bit-field MSVC would pack differently fails the Itanium build
dylan-conway
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65cac8e
dump-bytecode-cache-layout: entry headers are what derives from GenericCacheEntry (a \w*CacheEntry pattern also matched JSC::SpecialPropertyCacheEntry, which clang-cl lays out in this TU)
dylan-conway
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32d83b5
CachedTypes: every record placed in a payload is padding-free (has_unique_object_representations) and has an asserted size
dylan-conway
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2a1467f
guard __has_warning with defined() so non-clang preprocessors still parse the line
dylan-conway
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34ba093
BytecodeGenerator: a folded NaN constant is the canonical NaN, not the host CPU's (x86 and ARM disagree on the sign of 0/0)
dylan-conway
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4d49914
guard the CachedWebAssemblySourceProvider size assert with ENABLE(WEBASSEMBLY)
dylan-conway
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f98dd25
Remove the record-layout dump and its CI comparison; the static_asserts in CachedTypes.cpp cover it at compile time
dylan-conway
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18ff9a9