/**
* Extracts and returns the source position information out of an instruction list.
*
* @param insns {@code non-null;} instructions to convert
* @param howMuch how much information should be included; one of the static constants defined by
* this class
* @return {@code non-null;} the positions list
*/
public static PositionList make(DalvInsnList insns, int howMuch) {
switch (howMuch) {
case NONE:
{
return EMPTY;
}
case LINES:
case IMPORTANT:
{
// Valid.
break;
}
default:
{
throw new IllegalArgumentException("bogus howMuch");
}
}
SourcePosition noInfo = SourcePosition.NO_INFO;
SourcePosition cur = noInfo;
int sz = insns.size();
PositionList.Entry[] arr = new PositionList.Entry[sz];
boolean lastWasTarget = false;
int at = 0;
for (int i = 0; i < sz; i++) {
DalvInsn insn = insns.get(i);
if (insn instanceof CodeAddress) {
lastWasTarget = true;
;
continue;
}
SourcePosition pos = insn.getPosition();
if (pos.equals(noInfo) || pos.sameLine(cur)) {
continue;
}
if ((howMuch == IMPORTANT) && !lastWasTarget) {
continue;
}
cur = pos;
arr[at] = new PositionList.Entry(insn.getAddress(), pos);
at++;
lastWasTarget = false;
}
PositionList result = new PositionList(at);
for (int i = 0; i < at; i++) {
result.set(i, arr[i]);
}
result.setImmutable();
return result;
}
