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Don't emit warnings if an unused variable was assigned a simple expression

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This commit is contained in:
Karol Stasiak 2018-03-06 00:20:50 +01:00
parent 92dd5d6913
commit 9634ea9516
2 changed files with 23 additions and 3 deletions
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12
src/main/scala/millfork/node/opt/UnusedGlobalVariables.scala
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@ -68,7 +68,17 @@ object UnusedGlobalVariables extends NodeOptimization {
case s: VariableDeclarationStatement =>
if (globalsToRemove(s.name)) None else Some(s)
case s@ExpressionStatement(FunctionCallExpression(op, VariableExpression(n) :: params)) if op.endsWith("=") =>
if (globalsToRemove(n)) params.map(ExpressionStatement) else Some(s)
if (globalsToRemove(n)) {
params.flatMap {
case VariableExpression(_) => None
case LiteralExpression(_, _) => None
case x => Some(ExpressionStatement(x))
}
} else Some(s)
case s@Assignment(VariableExpression(n), VariableExpression(_)) =>
if (globalsToRemove(n)) Nil else Some(s)
case s@Assignment(VariableExpression(n), LiteralExpression(_, _)) =>
if (globalsToRemove(n)) Nil else Some(s)
case s@Assignment(VariableExpression(n), expr) =>
if (globalsToRemove(n)) Some(ExpressionStatement(expr)) else Some(s)
case s@Assignment(SeparateBytesExpression(VariableExpression(h), VariableExpression(l)), expr) =>

14
src/main/scala/millfork/node/opt/UnusedLocalVariables.scala
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@ -74,11 +74,21 @@ object UnusedLocalVariables extends NodeOptimization {
removeVariables(statements, localsToRemove)
}
def removeVariables(statements: List[Statement], localsToRemove: Set[String]): List[Statement] = statements.flatMap {
def removeVariables(statements: List[Statement], localsToRemove: Set[String]): List[Statement] = if (localsToRemove.isEmpty) statements else statements.flatMap {
case s: VariableDeclarationStatement =>
if (localsToRemove(s.name)) None else Some(s)
case s@ExpressionStatement(FunctionCallExpression(op, VariableExpression(n) :: params)) if op.endsWith("=") =>
if (localsToRemove(n)) params.map(ExpressionStatement) else Some(s)
if (localsToRemove(n)) {
params.flatMap {
case VariableExpression(_) => None
case LiteralExpression(_, _) => None
case x => Some(ExpressionStatement(x))
}
} else Some(s)
case s@Assignment(VariableExpression(n), VariableExpression(_)) =>
if (localsToRemove(n)) Nil else Some(s)
case s@Assignment(VariableExpression(n), LiteralExpression(_, _)) =>
if (localsToRemove(n)) Nil else Some(s)
case s@Assignment(VariableExpression(n), expr) =>
if (localsToRemove(n)) Some(ExpressionStatement(expr)) else Some(s)
case s@Assignment(SeparateBytesExpression(VariableExpression(h), VariableExpression(l)), expr) =>