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Convert BitMaskTransformer to Kotlin

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master
Graham 5 years ago
parent 8ac16d722b
commit 5b032c980f
2 changed files with 68 additions and 79 deletions
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  1. 79
      deob-ast/src/main/java/dev/openrs2/deob/ast/transform/BitMaskTransformer.java
  2. 68
      deob-ast/src/main/java/dev/openrs2/deob/ast/transform/BitMaskTransformer.kt

79
deob-ast/src/main/java/dev/openrs2/deob/ast/transform/BitMaskTransformer.java
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package dev.openrs2.deob.ast.transform;
import com.github.javaparser.ast.CompilationUnit;
import com.github.javaparser.ast.Node;
import com.github.javaparser.ast.expr.BinaryExpr;
import com.github.javaparser.ast.expr.IntegerLiteralExpr;
import com.google.common.collect.ImmutableSet;
import dev.openrs2.deob.ast.util.ExprUtils;
import dev.openrs2.deob.ast.util.NodeUtils;
public final class BitMaskTransformer extends Transformer {
private static final ImmutableSet<BinaryExpr.Operator> SHIFT_OPS = ImmutableSet.of(
BinaryExpr.Operator.SIGNED_RIGHT_SHIFT,
BinaryExpr.Operator.UNSIGNED_RIGHT_SHIFT
);
private static final ImmutableSet<BinaryExpr.Operator> BITWISE_OPS = ImmutableSet.of(
BinaryExpr.Operator.BINARY_AND,
BinaryExpr.Operator.BINARY_OR,
BinaryExpr.Operator.XOR
);
@Override
public void transform(CompilationUnit unit) {
NodeUtils.walk(unit, Node.TreeTraversal.POSTORDER, BinaryExpr.class, expr -> {
var shiftOp = expr.getOperator();
var left = expr.getLeft();
var shamtExpr = expr.getRight();
if (!SHIFT_OPS.contains(shiftOp) || !left.isBinaryExpr() || !shamtExpr.isIntegerLiteralExpr()) {
return;
}
var bitwiseExpr = left.asBinaryExpr();
var bitwiseOp = bitwiseExpr.getOperator();
var argExpr = bitwiseExpr.getLeft();
var maskExpr = bitwiseExpr.getRight();
if (!BITWISE_OPS.contains(bitwiseOp) || !ExprUtils.isIntegerOrLongLiteral(maskExpr)) {
return;
}
var shamt = shamtExpr.asIntegerLiteralExpr().asInt();
if (maskExpr.isIntegerLiteralExpr()) {
var mask = maskExpr.asIntegerLiteralExpr().asInt();
switch (shiftOp) {
case SIGNED_RIGHT_SHIFT:
mask >>= shamt;
break;
case UNSIGNED_RIGHT_SHIFT:
mask >>>= shamt;
break;
default:
throw new IllegalStateException();
}
maskExpr = new IntegerLiteralExpr(mask);
} else {
var mask = maskExpr.asLongLiteralExpr().asLong();
switch (shiftOp) {
case SIGNED_RIGHT_SHIFT:
mask >>= shamt;
break;
case UNSIGNED_RIGHT_SHIFT:
mask >>>= shamt;
break;
default:
throw new IllegalStateException();
}
maskExpr = ExprUtils.createLong(mask);
}
expr.replace(new BinaryExpr(new BinaryExpr(argExpr.clone(), shamtExpr.clone(), shiftOp), maskExpr, bitwiseOp));
});
}
}

68
deob-ast/src/main/java/dev/openrs2/deob/ast/transform/BitMaskTransformer.kt
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@ -0,0 +1,68 @@
package dev.openrs2.deob.ast.transform
import com.github.javaparser.ast.CompilationUnit
import com.github.javaparser.ast.Node
import com.github.javaparser.ast.expr.BinaryExpr
import com.github.javaparser.ast.expr.IntegerLiteralExpr
import dev.openrs2.deob.ast.util.ExprUtils
import dev.openrs2.deob.ast.util.NodeUtils
class BitMaskTransformer : Transformer() {
override fun transform(unit: CompilationUnit) {
NodeUtils.walk(unit, Node.TreeTraversal.POSTORDER, BinaryExpr::class.java) { expr ->
val shiftOp = expr.operator
val left = expr.left
val shamtExpr = expr.right
if (!SHIFT_OPS.contains(shiftOp) || !left.isBinaryExpr || !shamtExpr.isIntegerLiteralExpr) {
return@walk
}
val bitwiseExpr = left.asBinaryExpr()
val bitwiseOp = bitwiseExpr.operator
val argExpr = bitwiseExpr.left
var maskExpr = bitwiseExpr.right
if (!BITWISE_OPS.contains(bitwiseOp) || !ExprUtils.isIntegerOrLongLiteral(maskExpr)) {
return@walk
}
val shamt = shamtExpr.asIntegerLiteralExpr().asInt()
if (maskExpr.isIntegerLiteralExpr) {
var mask = maskExpr.asIntegerLiteralExpr().asInt()
mask = when (shiftOp) {
BinaryExpr.Operator.SIGNED_RIGHT_SHIFT -> mask shr shamt
BinaryExpr.Operator.UNSIGNED_RIGHT_SHIFT -> mask ushr shamt
else -> throw IllegalStateException()
}
maskExpr = IntegerLiteralExpr(mask)
} else {
var mask = maskExpr.asLongLiteralExpr().asLong()
mask = when (shiftOp) {
BinaryExpr.Operator.SIGNED_RIGHT_SHIFT -> mask shr shamt
BinaryExpr.Operator.UNSIGNED_RIGHT_SHIFT -> mask ushr shamt
else -> throw IllegalStateException()
}
maskExpr = ExprUtils.createLong(mask)
}
expr.replace(BinaryExpr(BinaryExpr(argExpr.clone(), shamtExpr.clone(), shiftOp), maskExpr, bitwiseOp))
}
}
companion object {
private val SHIFT_OPS = setOf(
BinaryExpr.Operator.SIGNED_RIGHT_SHIFT,
BinaryExpr.Operator.UNSIGNED_RIGHT_SHIFT
)
private val BITWISE_OPS = setOf(
BinaryExpr.Operator.BINARY_AND,
BinaryExpr.Operator.BINARY_OR,
BinaryExpr.Operator.XOR
)
}
}
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