void get(Phase* phase, size_t* dagSlot, size_t* level = nullptr) {
MOZ_ASSERT(!done());
*dagSlot = activeSlot;
*phase = descendants.empty() ? Phase(current) : descendants.front();
if (level)
*level = phaseExtra[*phase].depth + baseLevel;
}
void advance() {
MOZ_ASSERT(!done());
if (!descendants.empty()) {
// Currently iterating over a multiparented subtree.
descendants.popFront();
if (!descendants.empty())
return;
// Just before leaving the last child, reset the iterator to look
// at "main" phases (in PHASE_DAG_NONE) instead of multiparented
// subtree phases.
++current;
activeSlot = PHASE_DAG_NONE;
baseLevel = 0;
return;
}
if (phaseExtra[current].dagSlot != PHASE_DAG_NONE) {
// The current phase has a shared subtree. Load them up into
// 'descendants' and advance to the first child.
activeSlot = phaseExtra[current].dagSlot;
descendants = dagDescendants[activeSlot].all();
MOZ_ASSERT(!descendants.empty());
baseLevel += phaseExtra[current].depth + 1;
return;
}
++current;
}
void advance() {
MOZ_ASSERT(!done());
if (!descendants.empty()) {
descendants.popFront();
if (!descendants.empty())
return;
++current;
activeSlot = PHASE_DAG_NONE;
baseLevel = 0;
return;
}
if (phaseExtra[current].dagSlot != PHASE_DAG_NONE) {
activeSlot = phaseExtra[current].dagSlot;
descendants = dagDescendants[activeSlot].all();
MOZ_ASSERT(!descendants.empty());
baseLevel += phaseExtra[current].depth + 1;
return;
}
++current;
}