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compiler panic on indexing empty literal arrays #4001

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ritzdorf opened this issue Apr 25, 2024 · 0 comments · May be fixed by #4034
Open

compiler panic on indexing empty literal arrays #4001

ritzdorf opened this issue Apr 25, 2024 · 0 comments · May be fixed by #4034
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bug - type 0 compiler halts or panics instead of generating code sev - low

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@ritzdorf
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Version Information

  • vyper Version (output of vyper --version OR linkable commit hash vyperlang/vyper@): b43ffac

Issue Description

Indexing an empty array is not caught by the type checker and causes the
code generation to fail with a compiler panic.

POC

Compiling the following contract will cause a compiler panic:

@external
def bar(x:uint128):
    a:uint128 = empty(DynArray[uint128,2])[0]
vyper.exceptions.TypeCheckFailure: indexing into zero array not allowed
@cyberthirst cyberthirst transferred this issue from another repository May 4, 2024
@charles-cooper charles-cooper transferred this issue from another repository May 4, 2024
@charles-cooper charles-cooper added the bug - type 0 compiler halts or panics instead of generating code label May 4, 2024
@charles-cooper charles-cooper changed the title Indexing Empty Arrays Not Prevented compiler panic on indexing empty literal arrays May 4, 2024
@cyberthirst cyberthirst mentioned this issue May 5, 2024
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@tserg tserg linked a pull request May 20, 2024 that will close this issue
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bug - type 0 compiler halts or panics instead of generating code sev - low
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fix[ux]: indexing empty literal arrays tserg/vyper
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@charles-cooper @ritzdorf