diff options
Diffstat (limited to 'src/main/java/ftbsc/lll/tools/InsnSequence.java')
-rw-r--r-- | src/main/java/ftbsc/lll/tools/InsnSequence.java | 138 |
1 files changed, 0 insertions, 138 deletions
diff --git a/src/main/java/ftbsc/lll/tools/InsnSequence.java b/src/main/java/ftbsc/lll/tools/InsnSequence.java deleted file mode 100644 index d00292e..0000000 --- a/src/main/java/ftbsc/lll/tools/InsnSequence.java +++ /dev/null @@ -1,138 +0,0 @@ -package ftbsc.lll.tools; - -import ftbsc.lll.exceptions.InstructionMismatchException; -import org.objectweb.asm.tree.AbstractInsnNode; -import org.objectweb.asm.tree.InsnList; - -import java.util.Objects; - -/** - * Represents a sequence of instructions contained within two given nodes. - * Extends {@link InsnList}, but provides additional flexibility and features. - */ -public class InsnSequence extends InsnList { - /** - * Public constructor. - * This creates an empty sequence. - */ - public InsnSequence() { - super(); - } - - /** - * Public constructor for list with single item. - * Must be given a single non-null node. - * @param node the node in question - */ - public InsnSequence(AbstractInsnNode node) { - super(); - this.add(node); - } - - /** - * Public constructor. - * Must be given two non-null, connected nodes. - * @param startNode the starting node of the pattern - * @param endNode the first node of the pattern - */ - public InsnSequence(AbstractInsnNode startNode, AbstractInsnNode endNode) { - Objects.requireNonNull(startNode); - Objects.requireNonNull(endNode); - for(; startNode != null; startNode = startNode.getNext()) { - this.add(startNode); - if(startNode == endNode) break; - } - if(startNode == null) - throw new InstructionMismatchException("Nodes" + getFirst() + " and " + getLast() + " are not connected."); - } - - /** - * Extends the existing get function from InsnList to allow for negative indexes. - * @param index the index of the instruction that must be returned - * @return the instruction whose index is given - */ - @Override - public AbstractInsnNode get(int index) { - if(index >= 0) - return super.get(index); - index = Math.abs(index); - if(index > size()) - throw new IndexOutOfBoundsException(); - return super.get(size() - index); - } - - /** - * Adds an array of nodes to the list. - * @param nodes the nodes to add - */ - public void add(AbstractInsnNode... nodes) { - for(AbstractInsnNode node : nodes) - this.add(node); - } - - /** - * Wraps InsnList's add() to throw an exception - * when given null values. - * @param node to add - */ - @Override - public void add(AbstractInsnNode node) { - Objects.requireNonNull(node); - super.add(node); - } - - /** - * Replaces a node with another one. Mostly used internally. - * @param oldNode node to replace - * @param newNode new node - */ - public void replaceNode(AbstractInsnNode oldNode, AbstractInsnNode newNode) { - super.insert(oldNode, newNode); - super.remove(oldNode); - } - - /** - * Replaces n occurrences of said opcode with the given node. - * @param opcode the opcode to replace - * @param newNode the replacement node - * @param amount how many occurrences to replace, set to 0 to replace all - * @return true if anything was changed, false otherwise - */ - public boolean replace(int opcode, AbstractInsnNode newNode, int amount) { - return replace(opcode, newNode, amount, false); - } - - /** - * Replaces n occurrences of said opcode with the given node. - * @param opcode the opcode to replace - * @param newNode the replacement node - * @param reverse whether the search should be done from the end - * @param amount how many occurrences to replace, set to 0 to replace all - * @return true if anything was changed, false otherwise - */ - public boolean replace(int opcode, AbstractInsnNode newNode, int amount, boolean reverse) { - boolean changed = false; - for(AbstractInsnNode cur = this.getFirst(); - cur != null && cur.getPrevious() != this.getLast() && cur.getNext() != this.getFirst(); - cur = reverse ? cur.getPrevious() : cur.getNext()) { - if(cur.getOpcode() == opcode) { - this.replaceNode(cur, newNode); - changed = true; - amount--; // will go to negative if it was already 0, causing it to go on until for loop finishes - if(amount == 0) - return changed; - } - } - return changed; - } - - /** - * Cut a number of nodes from the list. - * @param amount how many nodes to cut - * @param reverse true if should cut from the end, false otherwise - */ - public void cut(int amount, boolean reverse) { - for(int i = 0; i < amount; i++) - this.remove(reverse ? getLast() : getFirst()); - } -} |