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Cranelift: Traps need not be considered GC safepoints anymore #8810

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merged 1 commit into from
Jun 14, 2024

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@fitzgen fitzgen commented Jun 14, 2024

After #8809, the mutator cannot resume from a trap so we don't need to consider them safepoints, as no GC-managed references are live after the trap. The one exception being the debugtrap CLIF instruction, which is technically still a resumable trap, but which exists only for emitting the equivalent of an int3 breakpoint instruction for pausing in a debugger to inspect state, and should never be used for mutator-collector interactions.

After bytecodealliance#8809, the mutator cannot
resume from a trap so we don't need to consider them safepoints, as no
GC-managed references are live after the trap. The one exception being the
`debugtrap` CLIF instruction, which is technically still a resumable trap, but
which exists only for emitting the equivalent of an `int3` breakpoint
instruction for pausing in a debugger to inspect state, and should never be used
for mutator-collector interactions.
@fitzgen fitzgen requested a review from a team as a code owner June 14, 2024 19:43
@fitzgen fitzgen requested review from cfallin and removed request for a team June 14, 2024 19:43
@fitzgen fitzgen added this pull request to the merge queue Jun 14, 2024
Merged via the queue into bytecodealliance:main with commit 9c5ec3e Jun 14, 2024
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@fitzgen fitzgen deleted the traps-are-not-safepoints branch June 14, 2024 20:10
fitzgen added a commit to fitzgen/wasmtime that referenced this pull request Jun 14, 2024
github-merge-queue bot pushed a commit that referenced this pull request Jun 14, 2024
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2 participants