Class UnusedMethodArgument

Detects method calls where an argument is always the same constant or contract field, suggesting removal of the redundant parameter for gas optimization.

Why is this bad?

Passing the same value every damn time wastes gas and clutters the code. If an argument is always self.a or a literal like 42, just hardcode it inside the method.

What it checks

  • Arguments that are always the same contract field (self.x, self.y, etc.).
  • Arguments that are always the same literal (e.g., true, 42, "fixed_string").

Example

contract C {
  a: Int = 0;
  receive() { self.nextA(self.a); }
  receive("whatever") { self.nextA(self.a); }
  fun nextA(a: Int): Int {
    return a + 1; // Bad: `self.a` is always passed, so the parameter is useless
  }
}

Use instead:

contract C {
  a: Int = 0;
  receive() { self.nextA(); }
  receive("whatever") { self.nextA(); }
  fun nextA(): Int {
    return self.a + 1; // OK: Use `self.a` directly
  }
}

Hierarchy (view full)

Constructors

constructor

Properties

category ctx severity

Accessors

id kind shareImportedWarnings usesSouffle

Methods

check getCategory getSeverity makeWarning skipUnused

Constructors

constructor

Properties

category

category: Category = Category.OPTIMIZATION

Readonlyctx

ctx: MistiContext

severity

severity: Severity = Severity.LOW

Accessors

id

  • get id(): string

  • Gets the short identifier of the detector, used in analyzer warnings.

    Returns string

    The unique identifier of the detector.

kind

shareImportedWarnings

  • get shareImportedWarnings(): WarningsBehavior

  • Defines the behavior of warnings generated by this detector when working with multiple projects within a single Tact configuration.

    Here are the available options:

    1. "union" Leave this value if you don't care about warnings generated in other projects.
    2. "intersect" If the warning is generated for some source location of the imported file, it should be generated by each of the projects. Example: Constants from an imported file should not be reported iff they are unused in all the projects, so you need "intersect".

    Returns WarningsBehavior

usesSouffle

  • get usesSouffle(): boolean

  • Checks whether this detector needs the Soufflé binary to be executed.

    Returns boolean

Methods

check

getCategory

getSeverity

ProtectedmakeWarning

ProtectedskipUnused

Settings

Member Visibility

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Why is this bad?What it checksExample
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