/**
* Append another list to this one. Consumes argument list, i.e., it becomes empty.
*
* @param il list to append to end of this list
* @return instruction handle of the <B>first</B> appended instruction
*/
public InstructionHandle append(InstructionList il) {
if (il == null) {
throw new ClassGenException("Appending null InstructionList");
}
if (il.isEmpty()) {
return null;
}
if (isEmpty()) {
start = il.start;
end = il.end;
length = il.length;
il.clear();
return start;
} else {
return append(end, il); // was end.instruction
}
}
/**
* Insert another list before Instruction handle ih contained in this list. Consumes argument
* list, i.e., it becomes empty.
*
* @param ih where to append the instruction list
* @param il Instruction list to insert
* @return instruction handle of the first inserted instruction
*/
public InstructionHandle insert(InstructionHandle ih, InstructionList il) {
if (il == null) {
throw new ClassGenException("Inserting null InstructionList");
}
if (il.isEmpty()) {
return ih;
}
InstructionHandle prev = ih.prev, ret = il.start;
ih.prev = il.end;
il.end.next = ih;
il.start.prev = prev;
if (prev != null) {
prev.next = il.start;
} else {
start = il.start; // Update start ...
}
length += il.length; // Update length
il.clear();
return ret;
}
/**
* Append another list after instruction (handle) ih contained in this list. Consumes argument
* list, i.e., it becomes empty.
*
* @param ih where to append the instruction list
* @param il Instruction list to append to this one
* @return instruction handle pointing to the <B>first</B> appended instruction
*/
public InstructionHandle append(InstructionHandle ih, InstructionList il) {
if (il == null) {
throw new ClassGenException("Appending null InstructionList");
}
if (il.isEmpty()) {
return ih;
}
InstructionHandle next = ih.next, ret = il.start;
ih.next = il.start;
il.start.prev = ih;
il.end.next = next;
if (next != null) {
next.prev = il.end;
} else {
end = il.end; // Update end ...
}
length += il.length; // Update length
il.clear();
return ret;
}
