Open-source multiplayer game server compatible with the RuneScape client
https://www.openrs2.org/
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90 lines
2.9 KiB
90 lines
2.9 KiB
package dev.openrs2.deob.analysis
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import dev.openrs2.asm.MemberDesc
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import dev.openrs2.asm.classpath.ClassPath
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import org.objectweb.asm.Opcodes
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import org.objectweb.asm.tree.AbstractInsnNode
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import org.objectweb.asm.tree.ClassNode
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import org.objectweb.asm.tree.FieldInsnNode
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import org.objectweb.asm.tree.MethodNode
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import org.objectweb.asm.tree.analysis.Frame
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class FieldWriteAnalyzer(
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private val clazz: ClassNode,
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private val method: MethodNode,
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private val classPath: ClassPath,
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private val frames: Array<Frame<ThisValue>>
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) : DataFlowAnalyzer<Map<MemberDesc, FieldWriteCount>>(clazz.name, method) {
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override fun createEntrySet(): Map<MemberDesc, FieldWriteCount> {
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val set = mutableMapOf<MemberDesc, FieldWriteCount>()
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for (field in clazz.fields) {
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set[MemberDesc(field)] = FieldWriteCount.NEVER
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}
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return set
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}
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override fun createInitialSet(): Map<MemberDesc, FieldWriteCount> {
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return emptyMap()
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}
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override fun join(
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set1: Map<MemberDesc, FieldWriteCount>,
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set2: Map<MemberDesc, FieldWriteCount>
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): Map<MemberDesc, FieldWriteCount> {
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if (set1 == set2) {
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return set1
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}
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val set = mutableMapOf<MemberDesc, FieldWriteCount>()
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for (member in set1.keys union set2.keys) {
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val count1 = set1[member]
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val count2 = set2[member]
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set[member] = when {
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count1 == null && count2 != null -> count2
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count2 == null && count1 != null -> count1
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count1 == count2 -> count1!!
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else -> FieldWriteCount.UNKNOWN
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}
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}
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return set
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}
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override fun transfer(
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set: Map<MemberDesc, FieldWriteCount>,
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insn: AbstractInsnNode
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): Map<MemberDesc, FieldWriteCount> {
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if (insn !is FieldInsnNode) {
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return set
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} else if (insn.opcode != Opcodes.PUTFIELD && insn.opcode != Opcodes.PUTSTATIC) {
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return set
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}
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val member = MemberDesc(insn)
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val declaredOwner = classPath[insn.owner]!!.resolveField(member)!!.name
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if (declaredOwner != clazz.name) {
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return set
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}
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val isThis = if (insn.opcode == Opcodes.PUTFIELD) {
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val insnIndex = method.instructions.indexOf(insn)
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val frame = frames[insnIndex]
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frame.getStack(frame.stackSize - 2).isThis
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} else {
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true
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}
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val count = set.getOrDefault(member, FieldWriteCount.NEVER)
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return when {
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isThis && count == FieldWriteCount.NEVER -> set.plus(Pair(member, FieldWriteCount.EXACTLY_ONCE))
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isThis && count == FieldWriteCount.EXACTLY_ONCE -> set.plus(Pair(member, FieldWriteCount.UNKNOWN))
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// save an allocation if count is already set to UNKNOWN
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count == FieldWriteCount.UNKNOWN -> set
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else -> set.plus(Pair(member, FieldWriteCount.UNKNOWN))
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}
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}
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}
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