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feat: findFirstFreeIndex method
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1 changed files with 17 additions and 8 deletions
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@ -71,16 +71,25 @@ public class StackUtils implements Opcodes {
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* @return the index value of the new local variable
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*/
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public static int addLocalVariable(MethodNode method, String name, String desc, LabelNode start, LabelNode end) {
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final int targetIndex =
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method.localVariables
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.stream()
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.max(Comparator.comparingInt(v -> v.index))
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.map(var -> var.desc.equals("J") || var.desc.equals("D")
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? var.index + 2 //skip two if long or double - major java moment
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: var.index + 1)
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.orElse(0);
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final int targetIndex = findFirstFreeIndex(method);
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LocalVariableNode variable = new LocalVariableNode(name, desc, null, start, end, targetIndex);
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method.localVariables.add(variable);
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return targetIndex;
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}
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/**
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* Finds the first free index in the given {@link MethodNode}.
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* Used to create variables.
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* @param method the method to look in
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* @return the found index
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*/
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public static int findFirstFreeIndex(MethodNode method) {
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return method.localVariables
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.stream()
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.max(Comparator.comparingInt(v -> v.index))
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.map(var -> var.desc.equals("J") || var.desc.equals("D")
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? var.index + 2 //skip two if long or double - major java moment
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: var.index + 1)
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.orElse(0);
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}
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}
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