mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-21 03:29:40 +00:00
is recoded to use IntervalIterators. IntervalIterators can now maintain their own memory or let an external entity do it. Loop depth is a new user of IntervalPartition for calculating the loop nesting depth of a basic block TODO: add IntervalPartition capability to split intervals between the looping portion and the "tail" portion. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@69 91177308-0d34-0410-b5e6-96231b3b80d8
97 lines
3.4 KiB
C++
97 lines
3.4 KiB
C++
//===- IntervalPartition.h - Interval partition Calculation ------*- C++ -*--=//
|
|
//
|
|
// This file contains the declaration of the cfg::IntervalPartition class, which
|
|
// calculates and represents the interval partition of a method, or a
|
|
// preexisting interval partition.
|
|
//
|
|
// In this way, the interval partition may be used to reduce a flow graph down
|
|
// to its degenerate single node interval partition (unless it is irreducible).
|
|
//
|
|
// TODO: The IntervalPartition class should take a bool parameter that tells
|
|
// whether it should add the "tails" of an interval to an interval itself or if
|
|
// they should be represented as distinct intervals.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_INTERVAL_PARTITION_H
|
|
#define LLVM_INTERVAL_PARTITION_H
|
|
|
|
#include "llvm/Analysis/Interval.h"
|
|
#include <map>
|
|
|
|
class Method;
|
|
|
|
namespace cfg {
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// IntervalPartition - This class builds and holds an "interval partition" for
|
|
// a method. This partition divides the control flow graph into a set of
|
|
// maximal intervals, as defined with the properties above. Intuitively, a
|
|
// BasicBlock is a (possibly nonexistent) loop with a "tail" of non looping
|
|
// nodes following it.
|
|
//
|
|
class IntervalPartition {
|
|
typedef map<BasicBlock*, Interval*> IntervalMapTy;
|
|
IntervalMapTy IntervalMap;
|
|
|
|
typedef vector<Interval*> IntervalListTy;
|
|
IntervalListTy IntervalList;
|
|
Interval *RootInterval;
|
|
|
|
public:
|
|
typedef IntervalListTy::iterator iterator;
|
|
|
|
public:
|
|
// IntervalPartition ctor - Build the partition for the specified method
|
|
IntervalPartition(Method *M);
|
|
|
|
// IntervalPartition ctor - Build a reduced interval partition from an
|
|
// existing interval graph. This takes an additional boolean parameter to
|
|
// distinguish it from a copy constructor. Always pass in false for now.
|
|
//
|
|
IntervalPartition(IntervalPartition &I, bool);
|
|
|
|
// Destructor - Free memory
|
|
~IntervalPartition();
|
|
|
|
// getRootInterval() - Return the root interval that contains the starting
|
|
// block of the method.
|
|
inline Interval *getRootInterval() { return RootInterval; }
|
|
|
|
// isDegeneratePartition() - Returns true if the interval partition contains
|
|
// a single interval, and thus cannot be simplified anymore.
|
|
bool isDegeneratePartition() { return size() == 1; }
|
|
|
|
// TODO: isIrreducible - look for triangle graph.
|
|
|
|
// getBlockInterval - Return the interval that a basic block exists in.
|
|
inline Interval *getBlockInterval(BasicBlock *BB) {
|
|
IntervalMapTy::iterator I = IntervalMap.find(BB);
|
|
return I != IntervalMap.end() ? I->second : 0;
|
|
}
|
|
|
|
// Iterators to iterate over all of the intervals in the method
|
|
inline iterator begin() { return IntervalList.begin(); }
|
|
inline iterator end() { return IntervalList.end(); }
|
|
inline unsigned size() { return IntervalList.size(); }
|
|
|
|
private:
|
|
// addIntervalToPartition - Add an interval to the internal list of intervals,
|
|
// and then add mappings from all of the basic blocks in the interval to the
|
|
// interval itself (in the IntervalMap).
|
|
//
|
|
void addIntervalToPartition(Interval *I);
|
|
|
|
// updatePredecessors - Interval generation only sets the successor fields of
|
|
// the interval data structures. After interval generation is complete,
|
|
// run through all of the intervals and propogate successor info as
|
|
// predecessor info.
|
|
//
|
|
void updatePredecessors(Interval *Int);
|
|
};
|
|
|
|
} // End namespace cfg
|
|
|
|
#endif
|