Open-source multiplayer game server compatible with the RuneScape client
https://www.openrs2.org/
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73 lines
2.6 KiB
73 lines
2.6 KiB
package dev.openrs2.deob.ast.transform
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import com.github.javaparser.ast.CompilationUnit
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import com.github.javaparser.ast.expr.BinaryExpr
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import com.github.javaparser.ast.expr.IntegerLiteralExpr
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import dev.openrs2.deob.ast.util.checkedAsInt
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import dev.openrs2.deob.ast.util.checkedAsLong
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import dev.openrs2.deob.ast.util.isIntegerOrLongLiteral
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import dev.openrs2.deob.ast.util.toLongLiteralExpr
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import dev.openrs2.deob.ast.util.walk
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class BitMaskTransformer : Transformer() {
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override fun transformUnit(
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units: Map<String, CompilationUnit>,
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unit: CompilationUnit
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) {
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unit.walk { expr: BinaryExpr ->
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val shiftOp = expr.operator
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val left = expr.left
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val shamtExpr = expr.right
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if (shiftOp !in SHIFT_OPS || !left.isBinaryExpr || !shamtExpr.isIntegerLiteralExpr) {
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return@walk
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}
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val bitwiseExpr = left.asBinaryExpr()
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val bitwiseOp = bitwiseExpr.operator
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val argExpr = bitwiseExpr.left
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var maskExpr = bitwiseExpr.right
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if (bitwiseOp !in BITWISE_OPS || !maskExpr.isIntegerOrLongLiteral()) {
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return@walk
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}
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val shamt = shamtExpr.asIntegerLiteralExpr().checkedAsInt()
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if (maskExpr.isIntegerLiteralExpr) {
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var mask = maskExpr.asIntegerLiteralExpr().checkedAsInt()
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mask = when (shiftOp) {
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BinaryExpr.Operator.SIGNED_RIGHT_SHIFT -> mask shr shamt
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BinaryExpr.Operator.UNSIGNED_RIGHT_SHIFT -> mask ushr shamt
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else -> error("Invalid shiftOp")
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}
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maskExpr = IntegerLiteralExpr(mask.toString())
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} else {
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var mask = maskExpr.asLongLiteralExpr().checkedAsLong()
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mask = when (shiftOp) {
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BinaryExpr.Operator.SIGNED_RIGHT_SHIFT -> mask shr shamt
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BinaryExpr.Operator.UNSIGNED_RIGHT_SHIFT -> mask ushr shamt
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else -> error("Invalid shiftOp")
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}
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maskExpr = mask.toLongLiteralExpr()
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}
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expr.replace(BinaryExpr(BinaryExpr(argExpr.clone(), shamtExpr.clone(), shiftOp), maskExpr, bitwiseOp))
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}
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}
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private companion object {
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private val SHIFT_OPS = setOf(
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BinaryExpr.Operator.SIGNED_RIGHT_SHIFT,
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BinaryExpr.Operator.UNSIGNED_RIGHT_SHIFT
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)
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private val BITWISE_OPS = setOf(
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BinaryExpr.Operator.BINARY_AND,
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BinaryExpr.Operator.BINARY_OR,
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BinaryExpr.Operator.XOR
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)
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}
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}
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