Fixing a memory leak of xmlEntityPtr in librsvg
Librsvg fixed a memory leak issue caused by mishandling xmlEntityPtr instances in SVG parsing. A wrapper struct with Rust's Drop trait was used for automatic resource deallocation, improving memory management efficiency.
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Librsvg, a library for parsing and rendering SVG files, faced a memory leak issue related to xmlEntityPtr when handling invalid XML documents with entity definitions. The bug was identified and fixed by ensuring proper memory management of xmlEntityPtr instances stored in a hash table. Initially, manual freeing of entities was implemented, but a refactor overlooked early exits due to errors during parsing, causing the memory leak. The solution involved creating a wrapper struct around xmlEntityPtr and implementing the Drop trait to handle automatic resource deallocation by Rust. By updating the hash table to store values using the wrapper, Rust could manage memory correctly, preventing leaks. This approach simplified the code and ensured proper handling of external resources. The importance of wrapping external resources for automatic memory management was highlighted, emphasizing the benefits of leveraging Rust's capabilities for efficient resource handling.
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4 commentshttps://chatgpt.com/share/70af56e3-2fde-4dab-8b59-d05960dadd...
Just asking if there's a problem and asking Chat GPT to rank the error leads the memory leak error to be categorized as low criticality though.
https://chatgpt.com/share/68eb706a-05eb-44ca-8e2b-abc97c0422...
Pretty promising though that it was able to point out the problem even without pointing it out and it definitely caught the memory leak issue.
Claude 3.5 Sonnet was able to figure it out right away without pointing it out though.
Rust: drop
C++: T::~T()
C#: using + dispose
Java: try-with + autocloseable, or finally
Go: defer
Haskell: bracket
JavaScript: finally
Python: finally or with + __exit__
I wonder if it would be possible in Rust to do some magic at the Rust/C border in order to trick old C code into living inside an arena that is invisible to it?
As I get older my eyes strain more and all of this power packed into a single character really just puts me off. It seems like a strategy to emphasize writing code quickly rather than correctly, which is odd, given that this is opposite to the value proposition these languages purport to bring.
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