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//===- LoopPass.h - LoopPass class ----------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by Devang Patel and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines LoopPass class. All loop optimization
// and transformation passes are derived from LoopPass.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LOOP_PASS_H
#define LLVM_LOOP_PASS_H
#include "llvm/Analysis/LoopInfo.h"
#include "llvm/Pass.h"
#include "llvm/PassManagers.h"
#include "llvm/Function.h"
namespace llvm {
class LPPassManager;
class Loop;
class Function;
class LoopQueue;
class LoopPass : public Pass {
public:
// 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;
}
/// Assign pass manager to manager this pass
virtual void assignPassManager(PMStack &PMS,
PassManagerType PMT = PMT_LoopPassManager);
};
class LPPassManager : public FunctionPass, public PMDataManager {
public:
LPPassManager(int Depth);
~LPPassManager();
/// run - Execute all of the passes scheduled for execution. Keep track of
/// whether any of the passes modifies the module, and if so, return true.
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();
}
virtual const char *getPassName() const {
return "Loop Pass Manager";
}
// Print passes managed by this manager
void dumpPassStructure(unsigned Offset) {
llvm::cerr << std::string(Offset*2, ' ') << "Loop Pass Manager\n";
for (unsigned Index = 0; Index < getNumContainedPasses(); ++Index) {
Pass *P = getContainedPass(Index);
P->dumpPassStructure(Offset + 1);
dumpLastUses(P, Offset+1);
}
}
Pass *getContainedPass(unsigned N) {
assert ( N < PassVector.size() && "Pass number out of range!");
Pass *FP = static_cast<Pass *>(PassVector[N]);
return FP;
}
virtual PassManagerType getPassManagerType() {
return PMT_LoopPassManager;
}
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.
void deleteLoopFromQueue(Loop *L);
// 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:
LoopQueue *LQ;
bool skipThisLoop;
bool redoThisLoop;
};
} // End llvm namespace
#endif
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