CriticalPathBBMoveNodeSelector.hh

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/*
    Copyright (c) 2002-2009 Tampere University.
 
    This file is part of TTA-Based Codesign Environment (TCE).
 
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/**
 * @file CriticalPathBBMoveNodeSelector.hh
 *
 * Declaration of CriticalPathBBMoveNodeSelector class.
 *
 * @author Pekka Jääskeläinen 2007 (pekka.jaaskelainen-no.spam-tut.fi)
 * @note rating: red
 */
 
#ifndef TTA_CRITICAL_PATH_BB_MOVE_NODE_SELECTOR_HH
#define TTA_CRITICAL_PATH_BB_MOVE_NODE_SELECTOR_HH
 
#ifdef _GLIBCXX_DEBUG
/* If enabled, the priority list crashes with error 
   "elements in iterator range [__first, __last) do not form a heap
   with respect to the predicate __comp" when calling readyList_.pop() in 
   CriticalPathBBMoveNodeSelector::candidates().
 
   It's probably caused by a situation in which a node's priority changes
   during scheduling and the priority list does not notify the change before
   pop() is called and it detects a malformed heap (a parent node larger than
   a child node), or something.
 
   @todo This needs to be fixed at some point somehow as it might result in
         weird errors in some machines or undeterministic schedule.
*/
#undef _GLIBCXX_DEBUG
#endif
 
#include "MoveNodeSelector.hh"
#include "ReadyMoveNodeGroupList.hh"
 
class DataDependenceGraph;
 
namespace TTAProgram {
    class BasicBlock;
}
 
namespace TTAMachine {
    class Machine;
}
 
/**
 * Selects move nodes from a basic block and prioritizes move nodes on
 * the critical path of the data dependence graph.
 */
class CriticalPathBBMoveNodeSelector : public MoveNodeSelector {
public:
    CriticalPathBBMoveNodeSelector(
        TTAProgram::BasicBlock& bb, const TTAMachine::Machine& machine);
    CriticalPathBBMoveNodeSelector(
        DataDependenceGraph& bigDDG, TTAProgram::BasicBlock& bb,
        const TTAMachine::Machine& machine);
    CriticalPathBBMoveNodeSelector(
        DataDependenceGraph& ddg, const TTAMachine::Machine &machine);
 
    virtual ~CriticalPathBBMoveNodeSelector();
 
    virtual MoveNodeGroup candidates();
    virtual void notifyScheduled(MoveNode& node);
 
    virtual DataDependenceGraph& dataDependenceGraph();
 
    void mightBeReady(MoveNode& node);
 
private:
    bool isReadyToBeScheduled(MoveNode& node) const;
 
    /// Initializes ready list from nodes that are ready.
    void initializeReadylist();
 
    /// The data dependence graph built from the basic block.
    DataDependenceGraph* ddg_;
    /// The prioritized ready list.
    ReadyMoveNodeGroupList readyList_;
    // whether owns the DDG?
    bool ddgOwned_;
};
 
#endif