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[BUG] Using a default value for a List of functions attribute of a struct leads to an OOB error upon access. #3285

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thatstoasty opened this issue Jul 22, 2024 · 1 comment
Open

[BUG] Using a default value for a List of functions attribute of a struct leads to an OOB error upon access. #3285

thatstoasty opened this issue Jul 22, 2024 · 1 comment
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bug Something isn't working mojo-repo Tag all issues with this label

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@thatstoasty
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thatstoasty commented Jul 22, 2024 •
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Bug description

Given a Struct like

struct A():
    var funcs: List[fn() -> None]

Specifying a default argument value for funcs in the __init__() function signature leads to an OOB error when attempting to access the functions.

Steps to reproduce

Example

fn test() -> None:
    return None


struct Dummy():
    var funcs: List[fn() -> None]

    fn __init__(inout self, funcs: List[fn() -> None] = List[fn() -> None](test)):
        self.funcs = funcs

fn main() raises:
    var d = Dummy()
    for func in d.funcs:
        func[]()

System information

- What OS did you do install Mojo on ? MacOS 14.5
- Provide version information for Mojo by pasting the output of `mojo -v` mojo 2024.7.2205 (9b0e6242)
- Provide Modular CLI version by pasting the output of `modular -v` modular 0.7.1 (28ddab26)
@thatstoasty thatstoasty added bug Something isn't working mojo-repo Tag all issues with this label labels Jul 22, 2024
@thatstoasty
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Possibly related to #3126, but this issue still persists. It seems like it has something to do with compile time. When the List of functions is given as a default argument, the pointers to the functions show up as 0x0 when inspecting the List in the debugger. But they only show up as 0x0 when iterating over the list, the pointer addresses look correct up until that point.

@thatstoasty thatstoasty mentioned this issue Sep 5, 2024
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@thatstoasty