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Better removal of unused local variables

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This commit is contained in:
Karol Stasiak 2019-07-31 23:36:38 +02:00
parent a1eef66e5c
commit 7ded8376d8
1 changed files with 9 additions and 9 deletions
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18
src/main/scala/millfork/node/opt/UnusedLocalVariables.scala
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@ -74,7 +74,7 @@ object UnusedLocalVariables extends NodeOptimization {
case s: ArrayDeclarationStatement =>
if (localsToRemove(s.name)) None else Some(s)
case s@ExpressionStatement(FunctionCallExpression(op, VariableExpression(n) :: params)) if op.endsWith("=") =>
if (localsToRemove(n)) {
if (localsToRemove(extractThingName(n))) {
params.flatMap {
case VariableExpression(_) => None
case LiteralExpression(_, _) => None
@ -82,14 +82,14 @@ object UnusedLocalVariables extends NodeOptimization {
}
} else Some(s)
case s@Assignment(VariableExpression(n), VariableExpression(_)) =>
if (localsToRemove(n)) Nil else Some(s)
if (localsToRemove(extractThingName(n))) Nil else Some(s)
case s@Assignment(VariableExpression(n), LiteralExpression(_, _)) =>
if (localsToRemove(n)) Nil else Some(s)
if (localsToRemove(extractThingName(n))) Nil else Some(s)
case s@Assignment(VariableExpression(n), expr) =>
if (localsToRemove(n)) Some(ExpressionStatement(expr).pos(s.position)) else Some(s)
if (localsToRemove(extractThingName(n))) Some(ExpressionStatement(expr).pos(s.position)) else Some(s)
case s@Assignment(SeparateBytesExpression(he@VariableExpression(h), le@VariableExpression(l)), expr) =>
if (localsToRemove(h)) {
if (localsToRemove(l))
if (localsToRemove(extractThingName(h))) {
if (localsToRemove(extractThingName(l)))
Some(ExpressionStatement(expr).pos(s.position))
else
Some(Assignment(
@ -100,7 +100,7 @@ object UnusedLocalVariables extends NodeOptimization {
expr
).pos(s.position))
} else {
if (localsToRemove(l))
if (localsToRemove(extractThingName(l)))
Some(Assignment(
SeparateBytesExpression(
VariableExpression(h).pos(he.position),
@ -112,13 +112,13 @@ object UnusedLocalVariables extends NodeOptimization {
Some(s)
}
case s@Assignment(SeparateBytesExpression(h, VariableExpression(l)), expr) =>
if (localsToRemove(l)) Some(Assignment(
if (localsToRemove(extractThingName(l))) Some(Assignment(
SeparateBytesExpression(h, BlackHoleExpression).pos(h.position),
expr
).pos(s.position))
else Some(s)
case s@Assignment(SeparateBytesExpression(he@VariableExpression(h), l), expr) =>
if (localsToRemove(h)) Some(Assignment(
if (localsToRemove(extractThingName(h))) Some(Assignment(
SeparateBytesExpression(BlackHoleExpression, l).pos(he.position), expr
).pos(s.position))
else Some(s)