forked from openrs2/openrs2
parent
862c79e31c
commit
db785e38d0
@ -1,173 +0,0 @@ |
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package dev.openrs2.asm; |
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|
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import java.util.ArrayList; |
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import java.util.Arrays; |
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import java.util.HashSet; |
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import java.util.List; |
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import java.util.stream.Collectors; |
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|
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import org.objectweb.asm.Opcodes; |
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import org.objectweb.asm.Type; |
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import org.objectweb.asm.tree.AbstractInsnNode; |
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import org.objectweb.asm.tree.AnnotationNode; |
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import org.objectweb.asm.tree.FrameNode; |
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import org.objectweb.asm.tree.IincInsnNode; |
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import org.objectweb.asm.tree.LabelNode; |
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import org.objectweb.asm.tree.MethodNode; |
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import org.objectweb.asm.tree.VarInsnNode; |
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import org.objectweb.asm.tree.analysis.Analyzer; |
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import org.objectweb.asm.tree.analysis.AnalyzerException; |
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import org.objectweb.asm.tree.analysis.BasicInterpreter; |
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public final class MethodNodeUtils { |
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private static int localIndex(int access, List<Type> argTypes, int argIndex) { |
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var localIndex = 0; |
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if ((access & Opcodes.ACC_STATIC) == 0) { |
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localIndex++; |
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} |
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for (int i = 0; i < argIndex; i++) { |
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localIndex += argTypes.get(i).getSize(); |
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} |
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return localIndex; |
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} |
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private static int remap(int i, Type argType, int localIndex) { |
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if (i >= localIndex) { |
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return i - argType.getSize(); |
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} |
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return i; |
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} |
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private static List<Integer> remapAll(List<Integer> indexes, Type argType, int localIndex) { |
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return indexes.stream() |
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.map(i -> remap(i, argType, localIndex)) |
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.collect(Collectors.toList()); |
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} |
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public static void removeArgument(MethodNode method, int argIndex) { |
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/* remove argument from the signature */ |
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var type = Type.getType(method.desc); |
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var argTypes = new ArrayList<>(Arrays.asList(type.getArgumentTypes())); |
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var argType = argTypes.remove(argIndex); |
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method.desc = Type.getMethodDescriptor(type.getReturnType(), argTypes.toArray(Type[]::new)); |
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if (method.signature != null) { |
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throw new UnsupportedOperationException("Signatures unsupported"); |
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} |
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/* calculate index of the local we're removing */ |
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var localIndex = localIndex(method.access, argTypes, argIndex); |
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/* remove ParameterNode */ |
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if (method.parameters != null) { |
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method.parameters.remove(argIndex); |
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} |
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|
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/* remove annotations */ |
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if (method.visibleAnnotableParameterCount != 0) { |
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throw new UnsupportedOperationException("Non-zero visibleAnnotableParameterCount unsupported"); |
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} |
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if (method.visibleParameterAnnotations != null) { |
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@SuppressWarnings("unchecked") |
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var annotations = (List<AnnotationNode>[]) new List<?>[method.visibleParameterAnnotations.length - 1]; |
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System.arraycopy(method.visibleParameterAnnotations, 0, annotations, 0, argIndex); |
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System.arraycopy(method.visibleParameterAnnotations, argIndex + 1, annotations, argIndex, method.visibleParameterAnnotations.length - argIndex - 1); |
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method.visibleParameterAnnotations = annotations; |
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} |
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if (method.invisibleAnnotableParameterCount != 0) { |
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throw new UnsupportedOperationException("Non-zero invisibleAnnotableParameterCount unsupported"); |
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} |
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if (method.invisibleParameterAnnotations != null) { |
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@SuppressWarnings("unchecked") |
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var annotations = (List<AnnotationNode>[]) new List<?>[method.invisibleParameterAnnotations.length - 1]; |
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System.arraycopy(method.invisibleParameterAnnotations, 0, annotations, 0, argIndex); |
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System.arraycopy(method.invisibleParameterAnnotations, argIndex + 1, annotations, argIndex, method.invisibleParameterAnnotations.length - argIndex - 1); |
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method.invisibleParameterAnnotations = annotations; |
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} |
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/* reduce maxLocals */ |
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method.maxLocals -= argType.getSize(); |
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/* remap locals */ |
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if (method.localVariables != null) { |
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method.localVariables.removeIf(v -> v.index == localIndex); |
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method.localVariables.forEach(v -> v.index = remap(v.index, argType, localIndex)); |
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} |
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if (method.visibleLocalVariableAnnotations != null) { |
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method.visibleLocalVariableAnnotations.removeIf(v -> v.index.contains(localIndex)); |
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method.visibleLocalVariableAnnotations.forEach(v -> v.index = remapAll(v.index, argType, localIndex)); |
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} |
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if (method.invisibleLocalVariableAnnotations != null) { |
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method.invisibleLocalVariableAnnotations.removeIf(v -> v.index.contains(localIndex)); |
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method.invisibleLocalVariableAnnotations.forEach(v -> v.index = remapAll(v.index, argType, localIndex)); |
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} |
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for (var insn : method.instructions) { |
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switch (insn.getType()) { |
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case AbstractInsnNode.VAR_INSN: |
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var varInsn = (VarInsnNode) insn; |
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varInsn.var = remap(varInsn.var, argType, localIndex); |
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break; |
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case AbstractInsnNode.IINC_INSN: |
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var iincInsn = (IincInsnNode) insn; |
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iincInsn.var = remap(iincInsn.var, argType, localIndex); |
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break; |
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case AbstractInsnNode.FRAME: |
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var frame = (FrameNode) insn; |
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if (frame.type != Opcodes.F_NEW) { |
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throw new UnsupportedOperationException("Only F_NEW frames are supported"); |
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} |
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for (int i = 0; i < argType.getSize(); i++) { |
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frame.local.remove(localIndex); |
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} |
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break; |
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} |
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} |
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} |
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public static void removeDeadCode(String owner, MethodNode method) throws AnalyzerException { |
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boolean changed; |
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do { |
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changed = false; |
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var analyzer = new Analyzer<>(new BasicInterpreter()); |
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var frames = analyzer.analyze(owner, method); |
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var deadLabels = new HashSet<LabelNode>(); |
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var i = 0; |
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for (var it = method.instructions.iterator(); it.hasNext(); ) { |
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var insn = it.next(); |
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if (frames[i++] != null) { |
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continue; |
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} |
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if (insn.getType() == AbstractInsnNode.LABEL) { |
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deadLabels.add((LabelNode) insn); |
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} else { |
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it.remove(); |
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changed = true; |
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} |
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} |
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if (method.tryCatchBlocks.removeIf(tryCatch -> deadLabels.contains(tryCatch.start) && deadLabels.contains(tryCatch.end))) { |
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changed = true; |
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} |
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} while (changed); |
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} |
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public static boolean hasCode(MethodNode method) { |
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return (method.access & (Opcodes.ACC_NATIVE | Opcodes.ACC_ABSTRACT)) == 0; |
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} |
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private MethodNodeUtils() { |
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/* empty */ |
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} |
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} |
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@ -0,0 +1,134 @@ |
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package dev.openrs2.asm |
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import org.objectweb.asm.Opcodes |
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import org.objectweb.asm.Type |
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import org.objectweb.asm.tree.* |
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import org.objectweb.asm.tree.analysis.Analyzer |
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import org.objectweb.asm.tree.analysis.AnalyzerException |
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import org.objectweb.asm.tree.analysis.BasicInterpreter |
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import org.objectweb.asm.tree.analysis.BasicValue |
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private fun localIndex(access: Int, argTypes: Array<Type>, argIndex: Int): Int { |
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var localIndex = 0 |
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if (access and Opcodes.ACC_STATIC == 0) { |
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localIndex++ |
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} |
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for (i in 0 until argIndex) { |
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localIndex += argTypes[i].size |
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} |
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return localIndex |
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} |
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private fun remap(i: Int, argType: Type, localIndex: Int): Int { |
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return if (i >= localIndex) { |
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i - argType.size |
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} else { |
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i |
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} |
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} |
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private fun remapAll(indexes: List<Int>, argType: Type, localIndex: Int): MutableList<Int> { |
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return indexes.map { remap(it, argType, localIndex) }.toMutableList() |
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} |
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fun MethodNode.removeArgument(argIndex: Int) { |
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// remove argument from the descriptor |
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val type = Type.getType(desc) |
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val argType = type.argumentTypes[argIndex] |
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val argTypes = type.argumentTypes.filterIndexed { index, _ -> index != argIndex }.toTypedArray() |
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desc = Type.getMethodDescriptor(type.returnType, *argTypes) |
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// the client doesn't use signatures so don't bother with them |
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if (signature != null) { |
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throw UnsupportedOperationException("Signatures unsupported") |
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} |
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parameters?.removeAt(argIndex) |
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// remove annotations |
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if (visibleAnnotableParameterCount != 0) { |
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throw UnsupportedOperationException("Non-zero visibleAnnotableParameterCount unsupported") |
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} |
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if (visibleParameterAnnotations != null) { |
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visibleParameterAnnotations = |
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visibleParameterAnnotations.filterIndexed { index, _ -> index != argIndex }.toTypedArray() |
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} |
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if (invisibleAnnotableParameterCount != 0) { |
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throw UnsupportedOperationException("Non-zero invisibleAnnotableParameterCount unsupported") |
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} |
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if (invisibleParameterAnnotations != null) { |
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invisibleParameterAnnotations = |
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invisibleParameterAnnotations.filterIndexed { index, _ -> index != argIndex }.toTypedArray() |
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} |
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// remap locals |
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val localIndex = localIndex(access, argTypes, argIndex) |
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maxLocals -= argType.size |
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if (localVariables != null) { |
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localVariables.removeIf { it.index == localIndex } |
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localVariables.forEach { it.index = remap(it.index, argType, localIndex) } |
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} |
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if (visibleLocalVariableAnnotations != null) { |
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visibleLocalVariableAnnotations.removeIf { it.index.contains(localIndex) } |
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visibleLocalVariableAnnotations.forEach { it.index = remapAll(it.index, argType, localIndex) } |
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} |
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if (invisibleLocalVariableAnnotations != null) { |
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invisibleLocalVariableAnnotations.removeIf { it.index.contains(localIndex) } |
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invisibleLocalVariableAnnotations.forEach { it.index = remapAll(it.index, argType, localIndex) } |
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} |
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for (insn in instructions) { |
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when (insn) { |
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is VarInsnNode -> insn.`var` = remap(insn.`var`, argType, localIndex) |
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is IincInsnNode -> insn.`var` = remap(insn.`var`, argType, localIndex) |
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is FrameNode -> { |
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if (insn.type != Opcodes.F_NEW) { |
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throw UnsupportedOperationException("Only F_NEW frames are supported") |
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} |
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for (i in 0 until argType.size) { |
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insn.local.removeAt(localIndex) |
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} |
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} |
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} |
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} |
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} |
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@Throws(AnalyzerException::class) |
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fun MethodNode.removeDeadCode(owner: String) { |
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var changed: Boolean |
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do { |
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changed = false |
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val analyzer = Analyzer<BasicValue>(BasicInterpreter()) |
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val frames = analyzer.analyze(owner, this) |
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val deadLabels = mutableSetOf<LabelNode>() |
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val it = instructions.iterator() |
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var i = 0 |
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for (insn in it) { |
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if (frames[i++] != null) { |
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continue |
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} |
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if (insn is LabelNode) { |
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deadLabels.add(insn) |
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} else { |
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it.remove() |
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changed = true |
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} |
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} |
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changed = changed or tryCatchBlocks.removeIf { deadLabels.contains(it.start) && deadLabels.contains(it.end) } |
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} while (changed) |
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} |
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fun MethodNode.hasCode(): Boolean { |
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return access and (Opcodes.ACC_NATIVE or Opcodes.ACC_ABSTRACT) == 0 |
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} |
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