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533 lines
16 KiB
C++
533 lines
16 KiB
C++
/* -*-C++-*-
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****************************************************************************
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* File:
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* SchedGraph.h
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*
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* Purpose:
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* Scheduling graph based on SSA graph plus extra dependence edges
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* capturing dependences due to machine resources (machine registers,
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* CC registers, and any others).
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*
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* Strategy:
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* This graph tries to leverage the SSA graph as much as possible,
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* but captures the extra dependences through a common interface.
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*
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* History:
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* 7/20/01 - Vikram Adve - Created
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***************************************************************************/
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#ifndef LLVM_CODEGEN_SCHEDGRAPH_H
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#define LLVM_CODEGEN_SCHEDGRAPH_H
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#include "llvm/Support/NonCopyable.h"
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#include "llvm/Support/HashExtras.h"
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#include "llvm/Support/GraphTraits.h"
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#include <hash_map>
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class Value;
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class Instruction;
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class TerminatorInst;
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class BasicBlock;
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class Method;
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class TargetMachine;
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class SchedGraphEdge;
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class SchedGraphNode;
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class SchedGraph;
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class RegToRefVecMap;
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class MachineInstr;
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/******************** Exported Data Types and Constants ********************/
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typedef int ResourceId;
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const ResourceId InvalidResourceId = -1;
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//*********************** Public Class Declarations ************************/
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class SchedGraphEdge: public NonCopyable {
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public:
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enum SchedGraphEdgeDepType {
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CtrlDep, MemoryDep, DefUseDep, MachineRegister, MachineResource
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};
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enum DataDepOrderType {
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TrueDep, AntiDep, OutputDep, NonDataDep
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};
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protected:
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SchedGraphNode* src;
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SchedGraphNode* sink;
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SchedGraphEdgeDepType depType;
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DataDepOrderType depOrderType;
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int minDelay; // cached latency (assumes fixed target arch)
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union {
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const Value* val;
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int machineRegNum;
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ResourceId resourceId;
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};
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public:
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// For all constructors, if minDelay is unspecified, minDelay is
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// set to _src->getLatency().
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// constructor for CtrlDep or MemoryDep edges, selected by 3rd argument
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/*ctor*/ SchedGraphEdge(SchedGraphNode* _src,
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SchedGraphNode* _sink,
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SchedGraphEdgeDepType _depType,
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DataDepOrderType _depOrderType =TrueDep,
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int _minDelay = -1);
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// constructor for explicit def-use or memory def-use edge
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/*ctor*/ SchedGraphEdge(SchedGraphNode* _src,
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SchedGraphNode* _sink,
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const Value* _val,
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DataDepOrderType _depOrderType =TrueDep,
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int _minDelay = -1);
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// constructor for machine register dependence
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/*ctor*/ SchedGraphEdge(SchedGraphNode* _src,
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SchedGraphNode* _sink,
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unsigned int _regNum,
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DataDepOrderType _depOrderType =TrueDep,
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int _minDelay = -1);
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// constructor for any other machine resource dependences.
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// DataDepOrderType is always NonDataDep. It it not an argument to
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// avoid overloading ambiguity with previous constructor.
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/*ctor*/ SchedGraphEdge(SchedGraphNode* _src,
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SchedGraphNode* _sink,
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ResourceId _resourceId,
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int _minDelay = -1);
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/*dtor*/ ~SchedGraphEdge();
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SchedGraphNode* getSrc () const { return src; }
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SchedGraphNode* getSink () const { return sink; }
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int getMinDelay () const { return minDelay; }
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SchedGraphEdgeDepType getDepType () const { return depType; }
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const Value* getValue () const {
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assert(depType == DefUseDep || depType == MemoryDep); return val;
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}
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int getMachineReg () const {
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assert(depType == MachineRegister); return machineRegNum;
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}
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int getResourceId () const {
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assert(depType == MachineResource); return resourceId;
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}
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public:
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//
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// Debugging support
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//
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friend ostream& operator<<(ostream& os, const SchedGraphEdge& edge);
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void dump (int indent=0) const;
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private:
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// disable default ctor
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/*ctor*/ SchedGraphEdge(); // DO NOT IMPLEMENT
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};
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class SchedGraphNode: public NonCopyable {
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private:
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unsigned int nodeId;
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const Instruction* instr;
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const MachineInstr* minstr;
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vector<SchedGraphEdge*> inEdges;
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vector<SchedGraphEdge*> outEdges;
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int latency;
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public:
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typedef vector<SchedGraphEdge*>:: iterator iterator;
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typedef vector<SchedGraphEdge*>::const_iterator const_iterator;
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typedef vector<SchedGraphEdge*>:: reverse_iterator reverse_iterator;
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typedef vector<SchedGraphEdge*>::const_reverse_iterator const_reverse_iterator;
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public:
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//
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// Accessor methods
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//
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unsigned int getNodeId () const { return nodeId; }
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const Instruction* getInstr () const { return instr; }
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const MachineInstr* getMachineInstr () const { return minstr; }
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int getLatency () const { return latency; }
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unsigned int getNumInEdges () const { return inEdges.size(); }
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unsigned int getNumOutEdges () const { return outEdges.size(); }
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bool isDummyNode () const { return (minstr == NULL); }
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//
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// Iterators
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//
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iterator beginInEdges () { return inEdges.begin(); }
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iterator endInEdges () { return inEdges.end(); }
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iterator beginOutEdges () { return outEdges.begin(); }
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iterator endOutEdges () { return outEdges.end(); }
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const_iterator beginInEdges () const { return inEdges.begin(); }
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const_iterator endInEdges () const { return inEdges.end(); }
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const_iterator beginOutEdges () const { return outEdges.begin(); }
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const_iterator endOutEdges () const { return outEdges.end(); }
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public:
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//
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// Debugging support
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//
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friend ostream& operator<<(ostream& os, const SchedGraphNode& node);
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void dump (int indent=0) const;
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private:
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friend class SchedGraph; // give access for ctor and dtor
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friend class SchedGraphEdge; // give access for adding edges
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void addInEdge (SchedGraphEdge* edge);
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void addOutEdge (SchedGraphEdge* edge);
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void removeInEdge (const SchedGraphEdge* edge);
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void removeOutEdge (const SchedGraphEdge* edge);
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// disable default constructor and provide a ctor for single-block graphs
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/*ctor*/ SchedGraphNode(); // DO NOT IMPLEMENT
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/*ctor*/ SchedGraphNode (unsigned int _nodeId,
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const Instruction* _instr,
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const MachineInstr* _minstr,
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const TargetMachine& _target);
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/*dtor*/ ~SchedGraphNode ();
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};
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class SchedGraph :
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public NonCopyable,
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private hash_map<const MachineInstr*, SchedGraphNode*>
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{
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private:
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vector<const BasicBlock*> bbVec; // basic blocks included in the graph
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SchedGraphNode* graphRoot; // the root and leaf are not inserted
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SchedGraphNode* graphLeaf; // in the hash_map (see getNumNodes())
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public:
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typedef hash_map<const MachineInstr*, SchedGraphNode*>::iterator iterator;
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typedef hash_map<const MachineInstr*, SchedGraphNode*>::const_iterator const_iterator;
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public:
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//
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// Accessor methods
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//
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const vector<const BasicBlock*>& getBasicBlocks() const { return bbVec; }
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const unsigned int getNumNodes() const { return size()+2; }
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SchedGraphNode* getRoot() const { return graphRoot; }
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SchedGraphNode* getLeaf() const { return graphLeaf; }
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SchedGraphNode* getGraphNodeForInstr(const MachineInstr* minstr) const {
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const_iterator onePair = this->find(minstr);
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return (onePair != this->end())? (*onePair).second : NULL;
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}
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//
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// Delete nodes or edges from the graph.
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//
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void eraseNode (SchedGraphNode* node);
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void eraseIncomingEdges (SchedGraphNode* node,
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bool addDummyEdges = true);
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void eraseOutgoingEdges (SchedGraphNode* node,
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bool addDummyEdges = true);
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void eraseIncidentEdges (SchedGraphNode* node,
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bool addDummyEdges = true);
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//
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// Unordered iterators.
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// Return values is pair<const MachineIntr*,SchedGraphNode*>.
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//
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iterator begin() {
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return hash_map<const MachineInstr*, SchedGraphNode*>::begin();
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}
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iterator end() {
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return hash_map<const MachineInstr*, SchedGraphNode*>::end();
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}
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const_iterator begin() const {
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return hash_map<const MachineInstr*, SchedGraphNode*>::begin();
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}
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const_iterator end() const {
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return hash_map<const MachineInstr*, SchedGraphNode*>::end();
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}
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//
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// Ordered iterators.
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// Return values is pair<const MachineIntr*,SchedGraphNode*>.
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//
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// void postord_init();
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// postorder_iterator postord_begin();
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// postorder_iterator postord_end();
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// const_postorder_iterator postord_begin() const;
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// const_postorder_iterator postord_end() const;
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//
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// Debugging support
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//
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void dump () const;
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private:
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friend class SchedGraphSet; // give access to ctor
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// disable default constructor and provide a ctor for single-block graphs
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/*ctor*/ SchedGraph (); // DO NOT IMPLEMENT
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/*ctor*/ SchedGraph (const BasicBlock* bb,
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const TargetMachine& target);
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/*dtor*/ ~SchedGraph ();
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inline void noteGraphNodeForInstr (const MachineInstr* minstr,
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SchedGraphNode* node)
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{
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assert((*this)[minstr] == NULL);
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(*this)[minstr] = node;
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}
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//
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// Graph builder
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//
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void buildGraph (const TargetMachine& target);
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void buildNodesforVMInstr (const TargetMachine& target,
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const Instruction* instr);
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void addEdgesForInstruction (const MachineInstr& minstr,
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RegToRefVecMap& regToRefVecMap,
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const TargetMachine& target);
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void addCDEdges (const TerminatorInst* term,
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const TargetMachine& target);
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void addMemEdges (const vector<const Instruction*>& memVec,
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const TargetMachine& target);
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void addMachineRegEdges (RegToRefVecMap& regToRefVecMap,
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const TargetMachine& target);
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void addSSAEdge (SchedGraphNode* node,
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const Value* val,
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const TargetMachine& target);
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void addNonSSAEdgesForValue (const Instruction* instr,
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const TargetMachine& target);
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void addDummyEdges ();
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};
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class SchedGraphSet :
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public NonCopyable,
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private hash_map<const BasicBlock*, SchedGraph*>
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{
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private:
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const Method* method;
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public:
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typedef hash_map<const BasicBlock*, SchedGraph*>::iterator iterator;
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typedef hash_map<const BasicBlock*, SchedGraph*>::const_iterator const_iterator;
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public:
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/*ctor*/ SchedGraphSet (const Method* _method,
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const TargetMachine& target);
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/*dtor*/ ~SchedGraphSet ();
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//
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// Accessors
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//
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SchedGraph* getGraphForBasicBlock (const BasicBlock* bb) const {
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const_iterator onePair = this->find(bb);
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return (onePair != this->end())? (*onePair).second : NULL;
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}
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//
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// Iterators
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//
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iterator begin() {
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return hash_map<const BasicBlock*, SchedGraph*>::begin();
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}
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iterator end() {
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return hash_map<const BasicBlock*, SchedGraph*>::end();
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}
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const_iterator begin() const {
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return hash_map<const BasicBlock*, SchedGraph*>::begin();
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}
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const_iterator end() const {
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return hash_map<const BasicBlock*, SchedGraph*>::end();
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}
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//
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// Debugging support
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//
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void dump () const;
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private:
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inline void noteGraphForBlock(const BasicBlock* bb, SchedGraph* graph) {
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assert((*this)[bb] == NULL);
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(*this)[bb] = graph;
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}
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//
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// Graph builder
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//
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void buildGraphsForMethod (const Method *method,
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const TargetMachine& target);
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};
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//********************** Sched Graph Iterators *****************************/
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// Ok to make it a template because it shd get instantiated at most twice:
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// for <SchedGraphNode, SchedGraphNode::iterator> and
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// for <const SchedGraphNode, SchedGraphNode::const_iterator>.
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//
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template <class _NodeType, class _EdgeType, class _EdgeIter>
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class PredIterator: public std::bidirectional_iterator<_NodeType, ptrdiff_t> {
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protected:
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_EdgeIter oi;
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public:
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typedef PredIterator<_NodeType, _EdgeType, _EdgeIter> _Self;
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inline PredIterator(_EdgeIter startEdge) : oi(startEdge) {}
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inline bool operator==(const _Self& x) const { return oi == x.oi; }
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inline bool operator!=(const _Self& x) const { return !operator==(x); }
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// operator*() differs for pred or succ iterator
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inline _NodeType* operator*() const { return (*oi)->getSrc(); }
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inline _NodeType* operator->() const { return operator*(); }
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inline _EdgeType* getEdge() const { return *(oi); }
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inline _Self &operator++() { ++oi; return *this; } // Preincrement
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inline _Self operator++(int) { // Postincrement
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_Self tmp(*this); ++*this; return tmp;
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}
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inline _Self &operator--() { --oi; return *this; } // Predecrement
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inline _Self operator--(int) { // Postdecrement
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_Self tmp = *this; --*this; return tmp;
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}
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};
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template <class _NodeType, class _EdgeType, class _EdgeIter>
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class SuccIterator: public std::bidirectional_iterator<_NodeType, ptrdiff_t> {
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protected:
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_EdgeIter oi;
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public:
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typedef SuccIterator<_NodeType, _EdgeType, _EdgeIter> _Self;
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inline SuccIterator(_EdgeIter startEdge) : oi(startEdge) {}
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inline bool operator==(const _Self& x) const { return oi == x.oi; }
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inline bool operator!=(const _Self& x) const { return !operator==(x); }
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inline _NodeType* operator*() const { return (*oi)->getSink(); }
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inline _NodeType* operator->() const { return operator*(); }
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inline _EdgeType* getEdge() const { return *(oi); }
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inline _Self &operator++() { ++oi; return *this; } // Preincrement
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inline _Self operator++(int) { // Postincrement
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_Self tmp(*this); ++*this; return tmp;
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}
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inline _Self &operator--() { --oi; return *this; } // Predecrement
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inline _Self operator--(int) { // Postdecrement
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_Self tmp = *this; --*this; return tmp;
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}
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};
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//
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// sg_pred_iterator
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// sg_pred_const_iterator
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//
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typedef PredIterator<SchedGraphNode, SchedGraphEdge, SchedGraphNode::iterator>
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sg_pred_iterator;
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typedef PredIterator<const SchedGraphNode, const SchedGraphEdge,SchedGraphNode::const_iterator>
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sg_pred_const_iterator;
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inline sg_pred_iterator pred_begin( SchedGraphNode *N) {
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return sg_pred_iterator(N->beginInEdges());
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}
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inline sg_pred_iterator pred_end( SchedGraphNode *N) {
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return sg_pred_iterator(N->endInEdges());
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}
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inline sg_pred_const_iterator pred_begin(const SchedGraphNode *N) {
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return sg_pred_const_iterator(N->beginInEdges());
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}
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inline sg_pred_const_iterator pred_end( const SchedGraphNode *N) {
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return sg_pred_const_iterator(N->endInEdges());
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}
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//
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// sg_succ_iterator
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// sg_succ_const_iterator
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//
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typedef SuccIterator<SchedGraphNode, SchedGraphEdge, SchedGraphNode::iterator>
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sg_succ_iterator;
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typedef SuccIterator<const SchedGraphNode, const SchedGraphEdge,SchedGraphNode::const_iterator>
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sg_succ_const_iterator;
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inline sg_succ_iterator succ_begin( SchedGraphNode *N) {
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return sg_succ_iterator(N->beginOutEdges());
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}
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inline sg_succ_iterator succ_end( SchedGraphNode *N) {
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return sg_succ_iterator(N->endOutEdges());
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}
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inline sg_succ_const_iterator succ_begin(const SchedGraphNode *N) {
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return sg_succ_const_iterator(N->beginOutEdges());
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}
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inline sg_succ_const_iterator succ_end( const SchedGraphNode *N) {
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return sg_succ_const_iterator(N->endOutEdges());
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}
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// Provide specializations of GraphTraits to be able to use graph iterators on
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// the scheduling graph!
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//
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template <> struct GraphTraits<SchedGraph*> {
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typedef SchedGraphNode NodeType;
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typedef sg_succ_iterator ChildIteratorType;
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static inline NodeType *getEntryNode(SchedGraph *SG) { return SG->getRoot(); }
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static inline ChildIteratorType child_begin(NodeType *N) {
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return succ_begin(N);
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}
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static inline ChildIteratorType child_end(NodeType *N) {
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return succ_end(N);
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}
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};
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template <> struct GraphTraits<const SchedGraph*> {
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typedef const SchedGraphNode NodeType;
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typedef sg_succ_const_iterator ChildIteratorType;
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static inline NodeType *getEntryNode(const SchedGraph *SG) {
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return SG->getRoot();
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}
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static inline ChildIteratorType child_begin(NodeType *N) {
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return succ_begin(N);
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}
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static inline ChildIteratorType child_end(NodeType *N) {
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return succ_end(N);
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}
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};
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//************************ External Functions *****************************/
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ostream& operator<<(ostream& os, const SchedGraphEdge& edge);
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ostream& operator<<(ostream& os, const SchedGraphNode& node);
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/***************************************************************************/
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#endif
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