// Check if this pass is suitable for the current LPPassManager, if
// available. This pass P is not suitable for a LPPassManager if P
// is not preserving higher level analysis info used by other
// LPPassManager passes. In such case, pop LPPassManager from the
// stack. This will force assignPassManager() to create new
// LPPassManger as expected.
void LoopPass::preparePassManager(PMStack &PMS) {
// Find LPPassManager
while (!PMS.empty() &&
PMS.top()->getPassManagerType() > PMT_LoopPassManager)
PMS.pop();
// If this pass is destroying high level information that is used
// by other passes that are managed by LPM then do not insert
// this pass in current LPM. Use new LPPassManager.
if (PMS.top()->getPassManagerType() == PMT_LoopPassManager &&
!PMS.top()->preserveHigherLevelAnalysis(this))
PMS.pop();
}
/// Assign pass manager to manage this pass.
void LoopPass::assignPassManager(PMStack &PMS,
PassManagerType PreferredType) {
// Find LPPassManager
while (!PMS.empty() &&
PMS.top()->getPassManagerType() > PMT_LoopPassManager)
PMS.pop();
LPPassManager *LPPM;
if (PMS.top()->getPassManagerType() == PMT_LoopPassManager)
LPPM = (LPPassManager*)PMS.top();
else {
// Create new Loop Pass Manager if it does not exist.
assert (!PMS.empty() && "Unable to create Loop Pass Manager");
PMDataManager *PMD = PMS.top();
// [1] Create new Loop Pass Manager
LPPM = new LPPassManager();
LPPM->populateInheritedAnalysis(PMS);
// [2] Set up new manager's top level manager
PMTopLevelManager *TPM = PMD->getTopLevelManager();
TPM->addIndirectPassManager(LPPM);
// [3] Assign manager to manage this new manager. This may create
// and push new managers into PMS
Pass *P = LPPM->getAsPass();
TPM->schedulePass(P);
// [4] Push new manager into PMS
PMS.push(LPPM);
}
LPPM->add(this);
}
/// Assign pass manager to manage this pass.
void CallGraphSCCPass::assignPassManager(PMStack &PMS,
PassManagerType PreferredType) {
// Find CGPassManager
while (!PMS.empty() &&
PMS.top()->getPassManagerType() > PMT_CallGraphPassManager)
PMS.pop();
assert (!PMS.empty() && "Unable to handle Call Graph Pass");
CGPassManager *CGP = dynamic_cast<CGPassManager *>(PMS.top());
// Create new Call Graph SCC Pass Manager if it does not exist.
if (!CGP) {
assert (!PMS.empty() && "Unable to create Call Graph Pass Manager");
PMDataManager *PMD = PMS.top();
// [1] Create new Call Graph Pass Manager
CGP = new CGPassManager(PMD->getDepth() + 1);
// [2] Set up new manager's top level manager
PMTopLevelManager *TPM = PMD->getTopLevelManager();
TPM->addIndirectPassManager(CGP);
// [3] Assign manager to manage this new manager. This may create
// and push new managers into PMS
Pass *P = dynamic_cast<Pass *>(CGP);
TPM->schedulePass(P);
// [4] Push new manager into PMS
PMS.push(CGP);
}
CGP->add(this);
}