[threads] Update the fuzzer for shared types#6771
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kripken
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Jul 18, 2024
scripts/fuzz_opt.py
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| # The shared-everything feature is new and we want to fuzz it, but it | ||
| # also currently disables fuzzing V8, so disable it half the time. | ||
| if random.random() < 0.5: |
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Skipping V8 is pretty significant, how about 0.9 here?
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Sure, I guess in my local fuzzing I can always comment this out.
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| static HeapType sharedTrivialStruct = []() { | ||
| TypeBuilder builder(1); | ||
| builder[0] = Struct{}; | ||
| builder[0].setShared(); | ||
| return (*builder.build())[0]; | ||
| }(); | ||
| auto ht = share == Shared ? sharedTrivialStruct : trivialStruct; |
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Suggested change
| static HeapType sharedTrivialStruct = []() { | |
| TypeBuilder builder(1); | |
| builder[0] = Struct{}; | |
| builder[0].setShared(); | |
| return (*builder.build())[0]; | |
| }(); | |
| auto ht = share == Shared ? sharedTrivialStruct : trivialStruct; | |
| static HeapType makeSharedTrivialStruct = []() { | |
| TypeBuilder builder(1); | |
| builder[0] = Struct{}; | |
| builder[0].setShared(); | |
| return (*builder.build())[0]; | |
| }(); | |
| auto ht = share == Shared ? makeSharedTrivialStruct() : trivialStruct; |
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(also below, if this makes sense)
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Note the () after the lambda expression making this an IIFE meant to be executed once when the static local is initialized.
| auto child = children[i]; | ||
| if (child.isRef() && child.getHeapType() == HeapType::ext && | ||
| if (child.isRef() && child.getHeapType().isBasic() && | ||
| child.getHeapType().getBasic(Unshared) == HeapType::ext && |
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Perhaps we should have a helper for this common pattern of x.isBasic() && x.getHeapType.getBasic(Unshared) == Y, something like x.isEqualToUnsharedBasic(Y)?
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How about doing this as a follow-up? It could apply more broadly than just in these files.
kripken
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Jul 18, 2024
| auto child = children[i]; | ||
| if (child.isRef() && child.getHeapType() == HeapType::ext && | ||
| if (child.isRef() && child.getHeapType().isBasic() && | ||
| child.getHeapType().getBasic(Unshared) == HeapType::ext && |
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This abbreviates a common pattern where we first had to check whether a heap type was basic, then if it was, get its unshared version and compare it to some expected BasicHeapType. Suggested in #6771 (comment).
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This abbreviates a common pattern where we first had to check whether a heap type was basic, then if it was, get its unshared version and compare it to some expected BasicHeapType. Suggested in #6771 (comment).
Update the fuzzer to both handle shared types in initial contents and create and use new shared types without crashing or producing invalid modules. Since V8 does not have a complete implementation of shared-everything-threads yet, disable fuzzing V8 when shared-everything is enabled. To avoid losing too much coverage of V8, disable shared-everything in the fuzzer more frequently than other features.
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This abbreviates a common pattern where we first had to check whether a heap type was basic, then if it was, get its unshared version and compare it to some expected BasicHeapType. Suggested in #6771 (comment).
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This abbreviates a common pattern where we first had to check whether a heap type was basic, then if it was, get its unshared version and compare it to some expected BasicHeapType. Suggested in #6771 (comment).
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This abbreviates a common pattern where we first had to check whether a heap type was basic, then if it was, get its unshared version and compare it to some expected BasicHeapType. Suggested in #6771 (comment).
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Update the fuzzer to both handle shared types in initial contents and
create and use new shared types without crashing or producing invalid
modules. Since V8 does not have a complete implementation of
shared-everything-threads yet, disable fuzzing V8 when shared-everything
is enabled. To avoid losing too much coverage of V8, disable
shared-everything in the fuzzer more frequently than other features.