checker: detect recursive `.str()` method calls by medvednikov · Pull Request #27926 · vlang/v

medvednikov · 2026-07-23T19:20:11Z

Summary

Detect infinite recursive .str() method calls when .str() is called explicitly (e.g. n.str()) on the same receiver, not just through string interpolation
Previously, only string interpolation ('${n}') inside a .str() method was caught; explicit n.str() calls caused a segfault at runtime instead of a compile error
Add test case for sum type with recursive .str() in a match else branch

Closes #27923

chatgpt-codex-connector · 2026-07-23T19:20:15Z

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GGRei · 2026-07-24T08:48:59Z

@codex review

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Use the already-unwrapped `left_expr` instead of `node.left` so that `(n).str()` is also caught as recursive. Fix existing alias `str()` tests that were silently recursive (would segfault if actually called at runtime) by casting to the underlying array type.

chatgpt-codex-connector · 2026-07-25T07:58:41Z

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GGRei · 2026-07-25T08:10:52Z

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medvednikov · 2026-07-25T08:27:13Z

Verdict

Request changes. On the current head, 85d4911c79, the first review’s two problems are fixed, but the second review identifies two real P2 correctness issues that remain in the checker. The PR is still open with two commits and no newer fix after that review.

Findings

P2 — The check rejects valid, terminating recursion on mutable receivers

The new condition rejects every call to receiver.str() from that receiver’s str() method. It considers only the method name, receiver identifier, and type; it does not account for a mutable receiver changing state before the recursive call.

For example, this has a base case and makes progress:

struct Countdown {
mut:
    remaining int
}

fn (mut c Countdown) str() string {
    if c.remaining == 0 {
        return ''
    }
    c.remaining--
    return c.str()
}

The new guard would reject the final line even though the recursion terminates. Mutable str() methods are valid V—the repository already has pub fn (mut w Writer) str() string—so this is not an inherently invalid receiver form.

The practical minimum would be to avoid this diagnostic for mutable receivers and add a positive regression test. More generally, the PR description says it detects infinite recursion, while the implementation currently bans syntactic self-recursion regardless of progress.

P2 — Dereferencing a pointer receiver bypasses the diagnostic

For a pointer receiver:

struct Foo {}

fn (f &Foo) str() string {
    return (*f).str()
}

method_call removes only parentheses, leaving (*f) as an ast.PrefixExpr; therefore the left_expr is ast.Ident requirement is false and the diagnostic is skipped.

The remaining method-resolution path still looks up str on the underlying receiver type and records the method’s declared pointer receiver, so this expression targets the same method rather than an unrelated built-in.

The receiver normalization should recognize an explicit dereference of the current receiver, or use a helper that canonicalizes supported same-receiver forms. A dedicated (*f).str() negative test should accompany the fix.

Test coverage gap

The latest commit specifically changed the implementation so (n).str() is caught, but the only new checker test still exercises plain n.str(). There is no regression case for the parenthesized form that prompted the change.

I would add either another branch or a separate fixture containing:

fn (n Num) str() string {
    return (n).str()
}

This is not a current implementation failure, but it leaves the recent fix unprotected.

Comments and recent commits

The initial commit, 156b3f7c28, added the direct-call check and the sum-type regression test.

The first automated review raised:

Parenthesized receivers bypassing the check.
Existing alias-array str() fixtures now being rejected.

Commit 85d4911c79 addresses both: it switches to the already-unwrapped left_expr and explicitly casts the aliases to []Value before invoking the underlying array formatter. The commit also clarifies that the old alias implementations were silently recursive rather than valid delegation.

A second automated review of 85d4911c79 then raised the mutable-terminating-recursion and pointer-dereference cases above. I agree with both findings. The remaining conversation is review-trigger/quota bot traffic; there is no substantive human technical discussion yet.

Recommendation: keep the first two comments considered addressed, request changes for the two current P2 findings, and request the missing parenthesized-receiver regression test. CI and check results were not considered.

… str check - Don't flag recursive `.str()` on mutable receivers, since they can have terminating recursion through state changes. - Detect `(*f).str()` as a recursive call by recognizing dereference prefix expressions targeting the receiver. - Add parenthesized `(v).str()` regression test to the test fixture.

chatgpt-codex-connector · 2026-07-25T08:32:59Z

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Unwrap parentheses inside dereference expressions so `(*(f)).str()` is caught alongside `(*f).str()`. Add test cases for both pointer dereference forms.

GGRei · 2026-07-25T09:41:23Z

Alex, Should I keep running Codex reviews or not?

medvednikov · 2026-07-25T20:03:24Z

@codex review

@GGRei i got it now, thanks :)

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Recognize `(&f).str()` as recursive in addition to `(*f).str()` by accepting both `.mul` and `.amp` prefix operators in the receiver check.

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Peel through consecutive dereference and address-of prefix expressions (with parentheses) in a loop so forms like `(*(&q)).str()` are caught.

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…rsive str check - Unwrap same-type casts (e.g. `Alias(a).str()`) in the receiver normalization loop so they don't bypass the diagnostic. - Remove the `!rec_mut` blanket exemption: a mutable receiver calling `.str()` on itself without prior mutation is still infinite recursion.

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medvednikov · 2026-07-25T23:30:55Z

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…check - Detect recursion through local receiver aliases (`alias := f; alias.str()`) by resolving the variable's initializer expression. - Detect recursion through interface conversions (`Stringer(f).str()`) by unwrapping casts to interface types. - Document the recursive `.str()` restriction in doc/docs.md.

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Trace variable aliases transitively with a cycle guard so that `a := f; b := a; b.str()` is detected as recursive.

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…str check When a local copy is declared `mut`, it may have been modified before the `.str()` call, so stop following the alias chain at that point. This allows valid patterns like `mut next := c; next = ...; next.str()` while still catching immutable aliases.

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Propagate `is_changed` to the scope variable when `fail_if_immutable` marks a variable as changed, so the recursive str check can distinguish `mut alias := f; alias.str()` (unchanged, still recursive) from `mut next := f; next = ...; next.str()` (changed, may terminate).

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Handle ast.AsCast expressions in both the direct receiver and alias initializer normalization loops so that patterns like (Stringer(f) as Foo).str() inside Foo.str are correctly detected as recursive calls.

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Regenerate the .out file from the actual compiler output to fix stale line numbers and column offsets that drifted as test cases were added across commits.

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When a mutable variable is initialized with a default value and then reassigned from the receiver, Var.expr still holds the initializer and alias tracing stops. Detect this by falling back to a type+mutation check: if the variable is mutable, was changed, and has the same type as the receiver, treat it as a potential receiver alias. Also make the failcompile fence in docs.md self-contained by including the Color struct definition so check-md validates against the actual recursive str diagnostic.

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medvednikov · 2026-07-26T09:33:59Z

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checker: detect recursive .str() method calls on explicit method calls

156b3f7

Closes #27923

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checker: normalize parenthesized dereferences in recursive str check

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Unwrap parentheses inside dereference expressions so `(*(f)).str()` is caught alongside `(*f).str()`. Add test cases for both pointer dereference forms.

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checker: detect recursive .str() through address-of receiver

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Recognize `(&f).str()` as recursive in addition to `(*f).str()` by accepting both `.mul` and `.amp` prefix operators in the receiver check.

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checker: normalize nested */& wrappers in recursive str check

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Peel through consecutive dereference and address-of prefix expressions (with parentheses) in a loop so forms like `(*(&q)).str()` are caught.

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checker: follow multi-hop receiver aliases in recursive str check

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Trace variable aliases transitively with a cycle guard so that `a := f; b := a; b.str()` is detected as recursive.

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checker: unwrap as-casts in recursive str receiver checks

c8a5728

Handle ast.AsCast expressions in both the direct receiver and alias initializer normalization loops so that patterns like (Stringer(f) as Foo).str() inside Foo.str are correctly detected as recursive calls.

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checker: regenerate fixture locations for recursive str error test

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checker: address recursive str review feedback

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checker: preserve recursive str mutation paths

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checker: preserve recursive str alias provenance

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checker: honor branch reachability in recursive str

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checker: tighten recursive str progress analysis

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checker: retain recursive str block progress

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checker: refine recursive str alias provenance

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checker: preserve recursive str branch progress

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checker: ignore no-op helper mutations

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checker: distinguish recursive str storage effects

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medvednikov merged commit c669ee1 into master Jul 26, 2026
65 of 95 checks passed

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medvednikov commented Jul 23, 2026

Summary

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Verdict

Findings

P2 — The check rejects valid, terminating recursion on mutable receivers

P2 — Dereferencing a pointer receiver bypasses the diagnostic

Test coverage gap

Comments and recent commits

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