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