mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-13 20:32:21 +00:00
4dd88f6fbf
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
116 lines
3.7 KiB
C++
116 lines
3.7 KiB
C++
//===- llvm/Analysis/Interval.h - Interval Class Declaration -----*- C++ -*--=//
|
|
//
|
|
// This file contains the declaration of the cfg::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>
|
|
|
|
class BasicBlock;
|
|
|
|
namespace cfg {
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// 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 vector<BasicBlock*>::iterator succ_iterator;
|
|
typedef vector<BasicBlock*>::iterator pred_iterator;
|
|
typedef 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.
|
|
//
|
|
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.
|
|
//
|
|
vector<BasicBlock*> Successors;
|
|
|
|
// Predecessors - List of BasicBlocks that have this Interval's header block
|
|
// as one of their successors.
|
|
//
|
|
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;
|
|
};
|
|
|
|
|
|
// succ_begin/succ_end - define global functions 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 global functions 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();
|
|
}
|
|
|
|
} // End namespace cfg
|
|
|
|
#endif
|