Report warnings if *unchecked-math* and boxing happens


  • Type: Enhancement Enhancement
  • Status: Closed Closed
  • Priority: Major Major
  • Resolution: Completed
  • Affects Version/s: Release 1.6
  • Fix Version/s: Release 1.7
  • Component/s: None
  • Labels:
  • Patch:
    Code and Test
  • Approval:


Currently, it is difficult to tell that the compiler is using boxed math unless you look at the generated bytecode. The proposed enhancement here is to emit new warnings if *unchecked-math* is on and boxed math is occurring.

Approach: In the compiler, when compiling a StaticMethodExpr, if *unchecked-math* is true and the class is clojure.lang.Numbers and one of the parameters of static method is of type java.lang.Object or java.lang.Number, then emit a warning at compile-time.

In addition, there is a new WarnBoxedMath Java annotation - a small number of methods on Numbers with Object parameters use this annotation to indicate that warning should not take place. The same annotation can be (but is not currently) used to mark methods on Numbers without Object/Number params that should warn. See boxedmath.txt for a list of methods and categories.

Patch: clj-1325-v3.patch

Screened by:

  1. boxed.diff
    27/Mar/14 11:06 AM
    6 kB
    Alex Miller
  2. boxedmath.txt
    14/May/14 2:29 PM
    9 kB
    Alex Miller
  3. clj-1325.patch
    14/May/14 2:39 PM
    11 kB
    Alex Miller
  4. clj-1325-v2.patch
    16/May/14 11:19 AM
    11 kB
    Alex Miller
  5. clj-1325-v3.patch
    16/May/14 11:51 AM
    11 kB
    Alex Miller



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