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256 lines
8.3 KiB
C++
256 lines
8.3 KiB
C++
//===- DependenceGraph.h - Dependence graph for a function ------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file provides an explicit representation for the dependence graph
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// of a function, with one node per instruction and one edge per dependence.
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// Dependences include both data and control dependences.
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//
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// Each dep. graph node (class DepGraphNode) keeps lists of incoming and
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// outgoing dependence edges.
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//
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// Each dep. graph edge (class Dependence) keeps a pointer to one end-point
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// of the dependence. This saves space and is important because dep. graphs
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// can grow quickly. It works just fine because the standard idiom is to
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// start with a known node and enumerate the dependences to or from that node.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ANALYSIS_DEPENDENCEGRAPH_H
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#define LLVM_ANALYSIS_DEPENDENCEGRAPH_H
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#include "Support/hash_map"
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#include <cassert>
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#include <iosfwd>
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#include <utility>
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#include <vector>
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namespace llvm {
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class Instruction;
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class Function;
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class Dependence;
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class DepGraphNode;
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class DependenceGraph;
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//----------------------------------------------------------------------------
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/// enum DependenceType - The standard data dependence types
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///
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enum DependenceType {
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NoDependence = 0x0,
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TrueDependence = 0x1,
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AntiDependence = 0x2,
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OutputDependence = 0x4,
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ControlDependence = 0x8, // from a terminator to some other instr.
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IncomingFlag = 0x10 // is this an incoming or outgoing dep?
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};
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//----------------------------------------------------------------------------
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/// Dependence Class - A representation of a simple (non-loop-related)
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/// dependence.
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///
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class Dependence {
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DepGraphNode* toOrFromNode;
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unsigned char depType;
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public:
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Dependence(DepGraphNode* toOrFromN, DependenceType type, bool isIncoming)
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: toOrFromNode(toOrFromN),
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depType(type | (isIncoming? IncomingFlag : 0x0)) { }
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Dependence(const Dependence& D) : toOrFromNode(D.toOrFromNode),
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depType(D.depType) { }
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bool operator==(const Dependence& D) const {
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return toOrFromNode == D.toOrFromNode && depType == D.depType;
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}
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/// Get information about the type of dependence.
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///
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unsigned getDepType() const {
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return depType;
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}
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/// Get source or sink depending on what type of node this is!
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///
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DepGraphNode* getSrc() {
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assert(depType & IncomingFlag); return toOrFromNode;
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}
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const DepGraphNode* getSrc() const {
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assert(depType & IncomingFlag); return toOrFromNode;
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}
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DepGraphNode* getSink() {
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assert(! (depType & IncomingFlag)); return toOrFromNode;
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}
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const DepGraphNode* getSink() const {
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assert(! (depType & IncomingFlag)); return toOrFromNode;
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}
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/// Debugging support methods
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///
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void print(std::ostream &O) const;
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// Default constructor: Do not use directly except for graph builder code
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//
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Dependence() : toOrFromNode(NULL), depType(NoDependence) { }
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};
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#ifdef SUPPORTING_LOOP_DEPENDENCES
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struct LoopDependence: public Dependence {
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DependenceDirection dir;
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int distance;
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short level;
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LoopInfo* enclosingLoop;
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};
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#endif
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//----------------------------------------------------------------------------
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/// DepGraphNode Class - A representation of a single node in a dependence
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/// graph, corresponding to a single instruction.
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///
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class DepGraphNode {
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Instruction* instr;
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std::vector<Dependence> inDeps;
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std::vector<Dependence> outDeps;
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friend class DependenceGraph;
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typedef std::vector<Dependence>:: iterator iterator;
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typedef std::vector<Dependence>::const_iterator const_iterator;
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iterator inDepBegin() { return inDeps.begin(); }
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const_iterator inDepBegin() const { return inDeps.begin(); }
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iterator inDepEnd() { return inDeps.end(); }
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const_iterator inDepEnd() const { return inDeps.end(); }
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iterator outDepBegin() { return outDeps.begin(); }
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const_iterator outDepBegin() const { return outDeps.begin(); }
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iterator outDepEnd() { return outDeps.end(); }
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const_iterator outDepEnd() const { return outDeps.end(); }
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public:
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DepGraphNode(Instruction& I) : instr(&I) { }
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Instruction& getInstr() { return *instr; }
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const Instruction& getInstr() const { return *instr; }
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/// Debugging support methods
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///
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void print(std::ostream &O) const;
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};
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//----------------------------------------------------------------------------
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/// DependenceGraph Class - A representation of a dependence graph for a
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/// procedure. The primary query operation here is to look up a DepGraphNode for
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/// a particular instruction, and then use the in/out dependence iterators
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/// for the node.
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///
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class DependenceGraph {
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DependenceGraph(const DependenceGraph&); // DO NOT IMPLEMENT
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void operator=(const DependenceGraph&); // DO NOT IMPLEMENT
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typedef hash_map<Instruction*, DepGraphNode*> DepNodeMapType;
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typedef DepNodeMapType:: iterator map_iterator;
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typedef DepNodeMapType::const_iterator const_map_iterator;
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DepNodeMapType depNodeMap;
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inline DepGraphNode* getNodeInternal(Instruction& inst,
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bool createIfMissing = false) {
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map_iterator I = depNodeMap.find(&inst);
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if (I == depNodeMap.end())
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return (!createIfMissing)? NULL :
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depNodeMap.insert(
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std::make_pair(&inst, new DepGraphNode(inst))).first->second;
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else
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return I->second;
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}
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public:
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typedef std::vector<Dependence>:: iterator iterator;
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typedef std::vector<Dependence>::const_iterator const_iterator;
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public:
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DependenceGraph() { }
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~DependenceGraph();
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/// Get the graph node for an instruction. There will be one if and
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/// only if there are any dependences incident on this instruction.
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/// If there is none, these methods will return NULL.
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///
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DepGraphNode* getNode(Instruction& inst, bool createIfMissing = false) {
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return getNodeInternal(inst, createIfMissing);
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}
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const DepGraphNode* getNode(const Instruction& inst) const {
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return const_cast<DependenceGraph*>(this)
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->getNodeInternal(const_cast<Instruction&>(inst));
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}
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iterator inDepBegin(DepGraphNode& T) {
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return T.inDeps.begin();
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}
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const_iterator inDepBegin (const DepGraphNode& T) const {
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return T.inDeps.begin();
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}
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iterator inDepEnd(DepGraphNode& T) {
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return T.inDeps.end();
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}
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const_iterator inDepEnd(const DepGraphNode& T) const {
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return T.inDeps.end();
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}
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iterator outDepBegin(DepGraphNode& F) {
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return F.outDeps.begin();
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}
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const_iterator outDepBegin(const DepGraphNode& F) const {
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return F.outDeps.begin();
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}
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iterator outDepEnd(DepGraphNode& F) {
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return F.outDeps.end();
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}
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const_iterator outDepEnd(const DepGraphNode& F) const {
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return F.outDeps.end();
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}
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/// Debugging support methods
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///
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void print(const Function& func, std::ostream &O) const;
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public:
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/// AddSimpleDependence - adding and modifying the dependence graph.
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/// These should to be used only by dependence analysis implementations.
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///
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void AddSimpleDependence(Instruction& fromI, Instruction& toI,
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DependenceType depType) {
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DepGraphNode* fromNode = getNodeInternal(fromI, /*create*/ true);
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DepGraphNode* toNode = getNodeInternal(toI, /*create*/ true);
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fromNode->outDeps.push_back(Dependence(toNode, depType, false));
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toNode-> inDeps. push_back(Dependence(fromNode, depType, true));
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}
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#ifdef SUPPORTING_LOOP_DEPENDENCES
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// This interface is a placeholder to show what information is needed.
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// It will probably change when it starts being used.
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void AddLoopDependence(Instruction& fromI,
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Instruction& toI,
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DependenceType depType,
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DependenceDirection dir,
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int distance,
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short level,
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LoopInfo* enclosingLoop);
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#endif // SUPPORTING_LOOP_DEPENDENCES
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};
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} // End llvm namespace
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#endif
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