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//===- llvm/Analysis/Interval.h - Interval Class Declaration ----*- C++ -*-===//
//
// This file contains the declaration of the Interval class, which
// represents a set of CFG nodes and is a portion of an interval partition.
//
// Intervals have some interesting and useful properties, including the
// following:
// 1. The header node of an interval dominates all of the elements of the
// interval
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_INTERVAL_H
#define LLVM_INTERVAL_H
#include <vector>
#include <iosfwd>
class BasicBlock;
//===----------------------------------------------------------------------===//
//
// Interval Class - An Interval is a set of nodes defined such that every node
// in the interval has all of its predecessors in the interval (except for the
// header)
//
class Interval {
// HeaderNode - The header BasicBlock, which dominates all BasicBlocks in this
// interval. Also, any loops in this interval must go through the HeaderNode.
//
BasicBlock *HeaderNode;
public:
typedef std::vector<BasicBlock*>::iterator succ_iterator;
typedef std::vector<BasicBlock*>::iterator pred_iterator;
typedef std::vector<BasicBlock*>::iterator node_iterator;
inline Interval(BasicBlock *Header) : HeaderNode(Header) {
Nodes.push_back(Header);
}
inline Interval(const Interval &I) // copy ctor
: HeaderNode(I.HeaderNode), Nodes(I.Nodes), Successors(I.Successors) {}
inline BasicBlock *getHeaderNode() const { return HeaderNode; }
// Nodes - The basic blocks in this interval.
//
std::vector<BasicBlock*> Nodes;
// Successors - List of BasicBlocks that are reachable directly from nodes in
// this interval, but are not in the interval themselves.
// These nodes neccesarily must be header nodes for other intervals.
//
std::vector<BasicBlock*> Successors;
// Predecessors - List of BasicBlocks that have this Interval's header block
// as one of their successors.
//
std::vector<BasicBlock*> Predecessors;
// contains - Find out if a basic block is in this interval
inline bool contains(BasicBlock *BB) const {
for (unsigned i = 0; i < Nodes.size(); ++i)
if (Nodes[i] == BB) return true;
return false;
// I don't want the dependency on <algorithm>
//return find(Nodes.begin(), Nodes.end(), BB) != Nodes.end();
}
// isSuccessor - find out if a basic block is a successor of this Interval
inline bool isSuccessor(BasicBlock *BB) const {
for (unsigned i = 0; i < Successors.size(); ++i)
if (Successors[i] == BB) return true;
return false;
// I don't want the dependency on <algorithm>
//return find(Successors.begin(), Successors.end(), BB) != Successors.end();
}
// Equality operator. It is only valid to compare two intervals from the same
// partition, because of this, all we have to check is the header node for
// equality.
//
inline bool operator==(const Interval &I) const {
return HeaderNode == I.HeaderNode;
}
// isLoop - Find out if there is a back edge in this interval...
bool isLoop() const;
// print - Show contents in human readable format...
void print(std::ostream &O) const;
};
// succ_begin/succ_end - define methods so that Intervals may be used
// just like BasicBlocks can with the succ_* functions, and *::succ_iterator.
//
inline Interval::succ_iterator succ_begin(Interval *I) {
return I->Successors.begin();
}
inline Interval::succ_iterator succ_end(Interval *I) {
return I->Successors.end();
}
// pred_begin/pred_end - define methods so that Intervals may be used
// just like BasicBlocks can with the pred_* functions, and *::pred_iterator.
//
inline Interval::pred_iterator pred_begin(Interval *I) {
return I->Predecessors.begin();
}
inline Interval::pred_iterator pred_end(Interval *I) {
return I->Predecessors.end();
}
#endif
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