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better warning + don't remove non-trivial initializer expression for unused variables

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This commit is contained in:
Irmen de Jong 2022-12-24 17:22:30 +01:00
parent 1860f66de5
commit b526e132a7
1 changed files with 20 additions and 6 deletions
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26
codeOptimizers/src/prog8/optimizer/UnusedCodeRemover.kt
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@ -120,12 +120,26 @@ class UnusedCodeRemover(private val program: Program,
if(singleUse is AssignTarget) {
val assignment = singleUse.parent as Assignment
if(assignment.origin==AssignmentOrigin.VARINIT) {
if(!decl.definingModule.isLibrary)
errors.warn("removing unused variable '${decl.name}'", decl.position)
return listOf(
IAstModification.Remove(decl, parent as IStatementContainer),
IAstModification.Remove(assignment, assignment.parent as IStatementContainer)
)
if(assignment.value.isSimple) {
// remove the vardecl
if(!decl.definingModule.isLibrary)
errors.warn("removing unused variable '${decl.name}'", decl.position)
return listOf(
IAstModification.Remove(decl, parent as IStatementContainer),
IAstModification.Remove(assignment, assignment.parent as IStatementContainer)
)
} else if(assignment.value is IFunctionCall) {
// replace the unused variable's initializer function call by a void
errors.warn("replaced unused variable '${decl.name}' with void call, maybe this can be removed altogether", decl.position)
val fcall = assignment.value as IFunctionCall
val voidCall = FunctionCallStatement(fcall.target, fcall.args, true, fcall.position)
return listOf(
IAstModification.ReplaceNode(decl, voidCall, parent),
IAstModification.Remove(assignment, assignment.parent as IStatementContainer)
)
} else {
errors.warn("variable '${decl.name}' is unused but has non-trivial initialization assignment. Leaving this in but maybe it can be removed altogether", decl.position)
}
}
}
}