Remove unnecessary string conversions in error message construction #5826

ShaharNaveh · 2025-06-23T08:47:08Z

There are a lot more places where we can remove the call of .to_owned(), but this is just a start.

Did it here for a couple of files just to show how much code we can remove.

Summary by CodeRabbit

Refactor
- Simplified error message creation across multiple modules by removing redundant string conversions.
- Enhanced internal functions to accept more flexible string inputs for error messages.
- Improved efficiency and clarity in error handling without changing user-facing behavior or messages.

coderabbitai · 2025-06-23T08:47:15Z

Walkthrough

This change removes unnecessary string conversions (such as .into(), .to_owned(), and .to_string()) from error message construction throughout the codebase. Error messages are now passed as string slices directly to exception constructors, and some function signatures are updated to accept any impl Into<String> type for error messages. No logic or control flow is altered.

Changes

File(s)	Change Summary
stdlib/src/array.rs, stdlib/src/hashlib.rs	Removed redundant `.into()` calls from error message construction.
vm/src/buffer.rs	Removed `.to_owned()` from error messages; updated `new_struct_error` to accept `impl Into<String>`.
vm/src/builtins/classmethod.rs, vm/src/builtins/object.rs, vm/src/builtins/staticmethod.rs	Simplified error message construction by removing `.into()` on string literals.
vm/src/builtins/module.rs	Removed `.into()` from error message in module representation error.
vm/src/exceptions.rs	Uniformly removed `.to_owned()` from error messages; simplified string formatting in one instance.
vm/src/format.rs	Removed `.to_owned()` from error message construction in formatting errors.
vm/src/sequence.rs	Removed `.to_owned()` from memory error message.
vm/src/signal.rs	Simplified error creation by removing `.to_owned()` from error message.
vm/src/stdlib/io.rs	Uniformly removed `.to_owned()` from error messages in IO-related exceptions.
vm/src/vm/vm_new.rs	Updated exception constructors to accept `impl Into<String>` for error messages.
vm/src/vm/vm_ops.rs	Removed `.to_owned()` from error messages; minor refactoring of chained method calls.
vm/src/warn.rs	Removed `.to_string()`/`.to_owned()` from warning and type error messages.
wasm/lib/src/convert.rs	Removed unnecessary `.into()` conversions for error messages.
wasm/lib/src/js_module.rs	Removed `.to_owned()` from error messages in JS module errors.
wasm/lib/src/browser_module.rs	Removed `.into()` from error message in fetch response format error.

Sequence Diagram(s)

sequenceDiagram
    participant Caller
    participant ExceptionConstructor
    Note over Caller,ExceptionConstructor: Previous flow
    Caller->>ExceptionConstructor: new_type_error("msg".to_owned())
    Note over Caller,ExceptionConstructor: New flow
    Caller->>ExceptionConstructor: new_type_error("msg")

Possibly related PRs

RustPython/RustPython#5814: Refactored VirtualMachine exception constructors using a macro, which relates to this PR's changes in error message argument handling in the same functions.

Suggested reviewers

youknowone

Poem

A bunny with a string in paw,
Hopped through code and saw a flaw—
"No need to own, just pass along!
A borrowed slice will do no wrong."
Now errors flow with lighter cheer,
The code is clean, the message clear!
🐇✨

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Reviewing files that changed from the base of the PR and between ebc88bc and 324b8be.

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wasm/lib/src/convert.rs (1 hunks)

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wasm/lib/src/convert.rs

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youknowone · 2025-06-24T01:28:02Z

vm/src/vm/vm_new.rs

+    pub fn new_exception_msg(
+        &self,
+        exc_type: PyTypeRef,
+        msg: impl Into<String>,
+    ) -> PyBaseExceptionRef {
+        self.new_exception(exc_type, vec![self.ctx.new_str(msg.into()).into()])


I couldn't find the issue but we once discussed about this changes. We needed a cut to to reduce binary size. I think most of new_*_error is simple wrappers of this function. Then reverting only this one and new_exception_msg_dict to using String will be good enough keep the balance of DX and having a single code to create params for new_exception.

If one of the goals of the project is to reduce the binary size, I think this PR should be closed then.

I'm all for a clean, and better code as long as it's not hurting the goals of the project:)

If you think it's a good compromise then I'll implement your suggestions, but I'm afraid that you don't want to offend me by just closing the PR lol

I think the most outer wrappers becomes more cleaner by your way. By only turning new_exception_msg and new_exception_msg_dict back to take only String, other changes will not affect binary size.
They are small functions, so must be inlined before.

The binary sizes:

target main branch diff

debug 226548kb (222M) 226620kb (222M) +72kb

relase 21836kb (22M) 21828kb (22M) -8kb

This change actually reduces the binary size on the release target? can you please verify that that's also the case on your machine?

Interesting.

Build command: cargo build --release --no-default-features (because binary size tweaks usually wants less features)

Before patch: 15196432

After patch: 15213472

It increased 17kb for me.

I rebased this patch on current main before build. My arch is aarch64-apple-darwin

Oh, I built mine on aarch64-linux-android with cargo build (so with the default features).

I can recheck it without the default features, but I don't see the point in that as I assume the majority of RustPython users are not running on an android.

How should I proceed with this PR, if at all?

I am good with reverting only new_exception_msg and new_exception_msg_dict but keeping anything else as you did.

Before patch: 15212688

After patch: 15200016

ShaharNaveh added 6 commits June 23, 2025 11:23

Make new_X_error recv impl Into<String>

e7923f6

Maks the rest of the methods to be generic

485dea2

remove to_owned

93de8d8

Remove .to_owned() from more files

8d7deb2

Make new_struct_error to be generic as well

9e83d43

Remove .to_owned() from more places

704cc8f

coderabbitai bot changed the title ~~@coderabbitai~~ Remove unnecessary string conversions in error message construction Jun 23, 2025

Resolve wasm errors

2eefb81

youknowone reviewed Jun 24, 2025

View reviewed changes

ShaharNaveh added 3 commits June 24, 2025 17:44

Merge remote-tracking branch 'upstream/main' into cln-msg-generic-string

628ee03

Revert changes to new_exception_msg and new_exception_msg_dict

ebc88bc

fix wasm

324b8be

ShaharNaveh requested a review from youknowone June 24, 2025 16:36

youknowone approved these changes Jun 24, 2025

View reviewed changes

youknowone merged commit ab09de8 into RustPython:main Jun 24, 2025
12 checks passed

ShaharNaveh mentioned this pull request Jun 25, 2025

Remove redundent to_owned() and to_string() calls #5836

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target	main	branch	diff
debug	226548kb (222M)	226620kb (222M)	+72kb
relase	21836kb (22M)	21828kb (22M)	-8kb

Remove unnecessary string conversions in error message construction #5826

Remove unnecessary string conversions in error message construction #5826

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