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feat: findFirstFreeIndex method

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zaaarf 2024-04-20 10:33:50 +02:00
parent d06b6211bc
commit 8f6f5615ce
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1 changed files with 17 additions and 8 deletions
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19
src/main/java/ftbsc/lll/utils/StackUtils.java
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@ -71,16 +71,25 @@ public class StackUtils implements Opcodes {
* @return the index value of the new local variable
*/
public static int addLocalVariable(MethodNode method, String name, String desc, LabelNode start, LabelNode end) {
final int targetIndex =
method.localVariables
final int targetIndex = findFirstFreeIndex(method);
LocalVariableNode variable = new LocalVariableNode(name, desc, null, start, end, targetIndex);
method.localVariables.add(variable);
return targetIndex;
}
/**
* Finds the first free index in the given {@link MethodNode}.
* Used to create variables.
* @param method the method to look in
* @return the found index
*/
public static int findFirstFreeIndex(MethodNode method) {
return method.localVariables
.stream()
.max(Comparator.comparingInt(v -> v.index))
.map(var -> var.desc.equals("J") || var.desc.equals("D")
? var.index + 2 //skip two if long or double - major java moment
: var.index + 1)
.orElse(0);
LocalVariableNode variable = new LocalVariableNode(name, desc, null, start, end, targetIndex);
method.localVariables.add(variable);
return targetIndex;
}
}