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definition/src/main/java/dev/su5ed/sinytra/adapter/patch/transformer/LVTSnapshot.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,102 @@ | ||
| package dev.su5ed.sinytra.adapter.patch.transformer; | ||
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| import dev.su5ed.sinytra.adapter.patch.util.AdapterUtil; | ||
| import dev.su5ed.sinytra.adapter.patch.util.SingleValueHandle; | ||
| import it.unimi.dsi.fastutil.ints.Int2IntArrayMap; | ||
| import it.unimi.dsi.fastutil.ints.Int2IntMap; | ||
| import it.unimi.dsi.fastutil.ints.IntArraySet; | ||
| import it.unimi.dsi.fastutil.ints.IntSet; | ||
| import org.jetbrains.annotations.NotNull; | ||
| import org.objectweb.asm.Type; | ||
| import org.objectweb.asm.tree.MethodNode; | ||
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|
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| import java.util.ArrayList; | ||
| import java.util.Arrays; | ||
| import java.util.Collections; | ||
| import java.util.Comparator; | ||
| import java.util.List; | ||
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| public class LVTSnapshot { | ||
| private final List<LocalVar> locals; | ||
| private final int[] vars; | ||
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| public LVTSnapshot(List<LocalVar> locals, int[] vars) { | ||
| this.locals = locals; | ||
| this.vars = vars; | ||
| } | ||
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| public void applyDifference(MethodNode newNode) { | ||
| final LVTSnapshot newLVT = take(newNode); | ||
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| // A new local var was removed | ||
| // Shift all other vars after it | ||
| final List<LocalVar> removed = new ArrayList<>(this.locals); | ||
| removed.removeIf(newLVT.locals::contains); | ||
| int[] newVars = Arrays.copyOf(this.vars, this.vars.length); | ||
| for (LocalVar local : removed) { | ||
| for (int i = 0; i < newVars.length; i++) { | ||
| if (newVars[i] > local.index) { | ||
| newVars[i] -= local.desc.getSize(); | ||
| } | ||
| } | ||
| newNode.localVariables.forEach(node -> { | ||
| if (node.index > local.index) { | ||
| node.index -= local.desc.getSize(); | ||
| } | ||
| }); | ||
| } | ||
|
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| // A new local var was added | ||
| // Shift all other vars after it, including the one that was replaced | ||
| final List<LocalVar> added = new ArrayList<>(newLVT.locals); | ||
| added.removeIf(this.locals::contains); | ||
| for (LocalVar local : added) { | ||
| for (int i = 0; i < newVars.length; i++) { | ||
| if (newVars[i] >= local.index) { | ||
| newVars[i] += local.desc.getSize(); | ||
| } | ||
| } | ||
| newNode.localVariables.forEach(node -> { | ||
| if (node.index >= local.index) { | ||
| node.index += local.desc.getSize(); | ||
| } | ||
| }); | ||
| } | ||
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| final Int2IntMap old2New = new Int2IntArrayMap(); | ||
| for (int i = 0; i < this.vars.length; i++) { | ||
| old2New.put(this.vars[i], newVars[i]); | ||
| } | ||
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| newNode.instructions.forEach(insn -> { | ||
| SingleValueHandle<Integer> handle = AdapterUtil.handleLocalVarInsnValue(insn); | ||
| if (handle != null) { | ||
| final int idx = handle.get(); | ||
| handle.set(old2New.getOrDefault(idx, idx)); | ||
| } | ||
| }); | ||
| } | ||
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| public static LVTSnapshot take(MethodNode node) { | ||
| final List<LocalVar> locals = new ArrayList<>(); | ||
| final IntSet vars = new IntArraySet(); | ||
| node.localVariables.forEach(local -> locals.add(new LocalVar(local.name, Type.getType(local.desc), local.index))); | ||
| node.instructions.forEach(insn -> { | ||
| SingleValueHandle<Integer> handle = AdapterUtil.handleLocalVarInsnValue(insn); | ||
| if (handle != null) { | ||
| vars.add((int) handle.get()); | ||
| } | ||
| }); | ||
| final int[] varsArray = vars.toIntArray(); | ||
| Arrays.sort(varsArray); | ||
| Collections.sort(locals); | ||
| return new LVTSnapshot(locals, varsArray); | ||
| } | ||
|
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| public record LocalVar(String name, Type desc, int index) implements Comparable<LocalVar> { | ||
| @Override | ||
| public int compareTo(@NotNull LVTSnapshot.LocalVar o) { | ||
| return Comparator.<Integer>naturalOrder().compare(this.index, o.index); | ||
| } | ||
| } | ||
| } |
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