class LoopPass : public Pass {
public:
- // runOnLoop - THis method should be implemented by the subclass to perform
+ explicit LoopPass(intptr_t pid) : Pass(pid) {}
+
+ // runOnLoop - This method should be implemented by the subclass to perform
// whatever action is necessary for the specfied Loop.
virtual bool runOnLoop (Loop *L, LPPassManager &LPM) = 0;
virtual bool runOnFunctionBody (Function &F, LPPassManager &LPM) {
return false;
}
+ // Initialization and finalization hooks.
+ virtual bool doInitialization(Loop *L, LPPassManager &LPM) {
+ return false;
+ }
+
+ // Finalization hook does not supply Loop because at this time
+ // loop nest is completely different.
+ virtual bool doFinalization() { return false; }
+
+ // 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 preparePassManager(PMStack &PMS);
+
/// Assign pass manager to manager this pass
virtual void assignPassManager(PMStack &PMS,
- PassManagerType PMT = PMT_LoopPassManager);
+ PassManagerType PMT = PMT_LoopPassManager);
+ /// Return what kind of Pass Manager can manage this pass.
+ virtual PassManagerType getPotentialPassManagerType() const {
+ return PMT_LoopPassManager;
+ }
};
class LPPassManager : public FunctionPass, public PMDataManager {
public:
+ static char ID;
LPPassManager(int Depth);
/// run - Execute all of the passes scheduled for execution. Keep track of
bool runOnFunction(Function &F);
/// Pass Manager itself does not invalidate any analysis info.
- void getAnalysisUsage(AnalysisUsage &Info) const {
- // LPPassManager needs LoopInfo. In the long term LoopInfo class will
- // be consumed by LPPassManager.
- Info.addRequired<LoopInfo>();
- Info.setPreservesAll();
- }
+ // LPPassManager needs LoopInfo.
+ void getAnalysisUsage(AnalysisUsage &Info) const;
virtual const char *getPassName() const {
return "Loop Pass Manager";
}
public:
- // Delete loop from the loop queue. This is used by Loop pass to inform
- // Loop Pass Manager that it should skip rest of the passes for this loop.
+ // Delete loop from the loop queue and loop nest (LoopInfo).
void deleteLoopFromQueue(Loop *L);
+
+ // Inset loop into the loop nest(LoopInfo) and loop queue(LQ).
+ void insertLoop(Loop *L, Loop *ParentLoop);
// Reoptimize this loop. LPPassManager will re-insert this loop into the
// queue. This allows LoopPass to change loop nest for the loop. This
// utility may send LPPassManager into infinite loops so use caution.
void redoLoop(Loop *L);
+
private:
std::deque<Loop *> LQ;
bool skipThisLoop;
bool redoThisLoop;
+ LoopInfo *LI;
+ Loop *CurrentLoop;
};
} // End llvm namespace