pi-lens/rules/tree-sitter-queries/c/no-redundant-pointer-ops.yml

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# S3491: Redundant pointer operator sequences should be removed
id: no-redundant-pointer-ops
name: Redundant Pointer Operator Sequences
severity: error
category: maintainability
defect_class: correctness
inline_tier: blocking
language: c

message: "redundant pointer operator sequence — simplify by removing canceling operators"

description: |
  Sequences like `*&x` or `&*p` are no-ops and reduce readability.
  They should be simplified to just the underlying expression.

  ✅ FIX: Remove the canceling operators

  ```c
  int y = x;   // instead of *&x
  int *q = p;  // instead of &*p
  ```

query: |
  [
    (pointer_expression
      "*"
      (pointer_expression
        "&"
        (_) @VAR)) @EXPR
    (pointer_expression
      "&"
      (pointer_expression
        "*"
        (_) @VAR)) @EXPR
  ]

metavars:
  - VAR
  - EXPR

tags:
  - maintainability
  - c
  - suspicious
  - readability

examples:
  bad: |
    int y = *&x;   // BAD - cancels out
    int *q = &*p;  // BAD - cancels out

  good: |
    int y = x;     // GOOD
    int *q = p;    // GOOD

has_fix: true
fix_action: simplify_pointer_ops