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llvm-svn: 20732
579 lines
22 KiB
C++
579 lines
22 KiB
C++
//===- DSGraph.h - Represent a collection of data structures ----*- 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 header defines the data structure graph (DSGraph) and the
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// ReachabilityCloner class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ANALYSIS_DSGRAPH_H
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#define LLVM_ANALYSIS_DSGRAPH_H
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#include "llvm/Analysis/DataStructure/DSNode.h"
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#include "llvm/ADT/hash_map"
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#include "llvm/ADT/EquivalenceClasses.h"
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#include <list>
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namespace llvm {
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class GlobalValue;
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//===----------------------------------------------------------------------===//
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/// DSScalarMap - An instance of this class is used to keep track of all of
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/// which DSNode each scalar in a function points to. This is specialized to
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/// keep track of globals with nodes in the function, and to keep track of the
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/// unique DSNodeHandle being used by the scalar map.
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///
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/// This class is crucial to the efficiency of DSA with some large SCC's. In
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/// these cases, the cost of iterating over the scalar map dominates the cost
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/// of DSA. In all of these cases, the DSA phase is really trying to identify
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/// globals or unique node handles active in the function.
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///
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class DSScalarMap {
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typedef hash_map<Value*, DSNodeHandle> ValueMapTy;
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ValueMapTy ValueMap;
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typedef hash_set<GlobalValue*> GlobalSetTy;
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GlobalSetTy GlobalSet;
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EquivalenceClasses<GlobalValue*> &GlobalECs;
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public:
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DSScalarMap(EquivalenceClasses<GlobalValue*> &ECs) : GlobalECs(ECs) {}
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EquivalenceClasses<GlobalValue*> &getGlobalECs() const { return GlobalECs; }
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// Compatibility methods: provide an interface compatible with a map of
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// Value* to DSNodeHandle's.
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typedef ValueMapTy::const_iterator const_iterator;
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typedef ValueMapTy::iterator iterator;
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iterator begin() { return ValueMap.begin(); }
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iterator end() { return ValueMap.end(); }
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const_iterator begin() const { return ValueMap.begin(); }
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const_iterator end() const { return ValueMap.end(); }
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GlobalValue *getLeaderForGlobal(GlobalValue *GV) const {
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EquivalenceClasses<GlobalValue*>::iterator ECI = GlobalECs.findValue(GV);
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if (ECI == GlobalECs.end()) return GV;
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return *GlobalECs.findLeader(ECI);
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}
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iterator find(Value *V) {
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iterator I = ValueMap.find(V);
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if (I != ValueMap.end()) return I;
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if (GlobalValue *GV = dyn_cast<GlobalValue>(V)) {
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// If this is a global, check to see if it is equivalenced to something
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// in the map.
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GlobalValue *Leader = getLeaderForGlobal(GV);
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if (Leader != GV)
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I = ValueMap.find((Value*)Leader);
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}
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return I;
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}
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const_iterator find(Value *V) const {
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const_iterator I = ValueMap.find(V);
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if (I != ValueMap.end()) return I;
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if (GlobalValue *GV = dyn_cast<GlobalValue>(V)) {
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// If this is a global, check to see if it is equivalenced to something
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// in the map.
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GlobalValue *Leader = getLeaderForGlobal(GV);
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if (Leader != GV)
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I = ValueMap.find((Value*)Leader);
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}
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return I;
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}
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unsigned count(Value *V) const { return ValueMap.find(V) != ValueMap.end(); }
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void erase(Value *V) { erase(ValueMap.find(V)); }
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void eraseIfExists(Value *V) {
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iterator I = find(V);
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if (I != end()) erase(I);
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}
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/// replaceScalar - When an instruction needs to be modified, this method can
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/// be used to update the scalar map to remove the old and insert the new.
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///
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void replaceScalar(Value *Old, Value *New) {
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iterator I = find(Old);
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assert(I != end() && "Old value is not in the map!");
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ValueMap.insert(std::make_pair(New, I->second));
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erase(I);
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}
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/// copyScalarIfExists - If Old exists in the scalar map, make New point to
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/// whatever Old did.
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void copyScalarIfExists(Value *Old, Value *New) {
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iterator I = find(Old);
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if (I != end())
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ValueMap.insert(std::make_pair(New, I->second));
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}
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/// operator[] - Return the DSNodeHandle for the specified value, creating a
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/// new null handle if there is no entry yet.
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DSNodeHandle &operator[](Value *V) {
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iterator I = ValueMap.find(V);
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if (I != ValueMap.end())
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return I->second; // Return value if already exists.
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if (GlobalValue *GV = dyn_cast<GlobalValue>(V)) {
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// If the node doesn't exist, check to see if it's a global that is
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// equated to another global in the program.
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EquivalenceClasses<GlobalValue*>::iterator ECI = GlobalECs.findValue(GV);
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if (ECI != GlobalECs.end()) {
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GlobalValue *Leader = *GlobalECs.findLeader(ECI);
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if (Leader != GV)
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return operator[]((Value*)Leader);
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}
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// Okay, this is either not an equivalenced global or it is the leader, it
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// will be inserted into the scalar map now.
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GlobalSet.insert(GV);
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}
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return ValueMap.insert(std::make_pair(V, DSNodeHandle())).first->second;
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}
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void erase(iterator I) {
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assert(I != ValueMap.end() && "Cannot erase end!");
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if (GlobalValue *GV = dyn_cast<GlobalValue>(I->first))
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GlobalSet.erase(GV);
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ValueMap.erase(I);
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}
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void clear() {
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ValueMap.clear();
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GlobalSet.clear();
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}
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// Access to the global set: the set of all globals currently in the
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// scalar map.
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typedef GlobalSetTy::const_iterator global_iterator;
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global_iterator global_begin() const { return GlobalSet.begin(); }
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global_iterator global_end() const { return GlobalSet.end(); }
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unsigned global_size() const { return GlobalSet.size(); }
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unsigned global_count(GlobalValue *GV) const { return GlobalSet.count(GV); }
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};
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//===----------------------------------------------------------------------===//
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/// DSGraph - The graph that represents a function.
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///
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class DSGraph {
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public:
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// Public data-type declarations...
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typedef DSScalarMap ScalarMapTy;
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typedef hash_map<Function*, DSNodeHandle> ReturnNodesTy;
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typedef ilist<DSNode> NodeListTy;
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/// NodeMapTy - This data type is used when cloning one graph into another to
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/// keep track of the correspondence between the nodes in the old and new
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/// graphs.
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typedef hash_map<const DSNode*, DSNodeHandle> NodeMapTy;
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// InvNodeMapTy - This data type is used to represent the inverse of a node
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// map.
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typedef hash_multimap<DSNodeHandle, const DSNode*> InvNodeMapTy;
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private:
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DSGraph *GlobalsGraph; // Pointer to the common graph of global objects
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bool PrintAuxCalls; // Should this graph print the Aux calls vector?
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NodeListTy Nodes;
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ScalarMapTy ScalarMap;
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// ReturnNodes - A return value for every function merged into this graph.
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// Each DSGraph may have multiple functions merged into it at any time, which
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// is used for representing SCCs.
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//
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ReturnNodesTy ReturnNodes;
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// FunctionCalls - This list maintains a single entry for each call
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// instruction in the current graph. The first entry in the vector is the
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// scalar that holds the return value for the call, the second is the function
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// scalar being invoked, and the rest are pointer arguments to the function.
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// This vector is built by the Local graph and is never modified after that.
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//
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std::list<DSCallSite> FunctionCalls;
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// AuxFunctionCalls - This vector contains call sites that have been processed
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// by some mechanism. In pratice, the BU Analysis uses this vector to hold
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// the _unresolved_ call sites, because it cannot modify FunctionCalls.
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//
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std::list<DSCallSite> AuxFunctionCalls;
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/// TD - This is the target data object for the machine this graph is
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/// constructed for.
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const TargetData &TD;
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void operator=(const DSGraph &); // DO NOT IMPLEMENT
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DSGraph(const DSGraph&); // DO NOT IMPLEMENT
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public:
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// Create a new, empty, DSGraph.
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DSGraph(EquivalenceClasses<GlobalValue*> &ECs, const TargetData &td)
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: GlobalsGraph(0), PrintAuxCalls(false), ScalarMap(ECs), TD(td) {}
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// Compute the local DSGraph
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DSGraph(EquivalenceClasses<GlobalValue*> &ECs, const TargetData &TD,
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Function &F, DSGraph *GlobalsGraph);
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// Copy ctor - If you want to capture the node mapping between the source and
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// destination graph, you may optionally do this by specifying a map to record
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// this into.
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//
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// Note that a copied graph does not retain the GlobalsGraph pointer of the
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// source. You need to set a new GlobalsGraph with the setGlobalsGraph
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// method.
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//
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DSGraph(const DSGraph &DSG, EquivalenceClasses<GlobalValue*> &ECs);
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DSGraph(const DSGraph &DSG, NodeMapTy &NodeMap,
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EquivalenceClasses<GlobalValue*> &ECs);
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~DSGraph();
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DSGraph *getGlobalsGraph() const { return GlobalsGraph; }
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void setGlobalsGraph(DSGraph *G) { GlobalsGraph = G; }
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/// getGlobalECs - Return the set of equivalence classes that the global
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/// variables in the program form.
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EquivalenceClasses<GlobalValue*> &getGlobalECs() const {
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return ScalarMap.getGlobalECs();
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}
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/// getTargetData - Return the TargetData object for the current target.
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///
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const TargetData &getTargetData() const { return TD; }
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/// setPrintAuxCalls - If you call this method, the auxillary call vector will
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/// be printed instead of the standard call vector to the dot file.
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///
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void setPrintAuxCalls() { PrintAuxCalls = true; }
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bool shouldPrintAuxCalls() const { return PrintAuxCalls; }
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/// node_iterator/begin/end - Iterate over all of the nodes in the graph. Be
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/// extremely careful with these methods because any merging of nodes could
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/// cause the node to be removed from this list. This means that if you are
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/// iterating over nodes and doing something that could cause _any_ node to
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/// merge, your node_iterators into this graph can be invalidated.
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typedef NodeListTy::iterator node_iterator;
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node_iterator node_begin() { return Nodes.begin(); }
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node_iterator node_end() { return Nodes.end(); }
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typedef NodeListTy::const_iterator node_const_iterator;
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node_const_iterator node_begin() const { return Nodes.begin(); }
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node_const_iterator node_end() const { return Nodes.end(); }
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/// getFunctionNames - Return a space separated list of the name of the
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/// functions in this graph (if any)
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///
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std::string getFunctionNames() const;
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/// addNode - Add a new node to the graph.
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///
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void addNode(DSNode *N) { Nodes.push_back(N); }
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void unlinkNode(DSNode *N) { Nodes.remove(N); }
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/// getScalarMap - Get a map that describes what the nodes the scalars in this
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/// function point to...
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///
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ScalarMapTy &getScalarMap() { return ScalarMap; }
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const ScalarMapTy &getScalarMap() const { return ScalarMap; }
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/// getFunctionCalls - Return the list of call sites in the original local
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/// graph...
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///
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const std::list<DSCallSite> &getFunctionCalls() const { return FunctionCalls;}
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std::list<DSCallSite> &getFunctionCalls() { return FunctionCalls;}
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/// getAuxFunctionCalls - Get the call sites as modified by whatever passes
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/// have been run.
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///
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std::list<DSCallSite> &getAuxFunctionCalls() { return AuxFunctionCalls; }
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const std::list<DSCallSite> &getAuxFunctionCalls() const {
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return AuxFunctionCalls;
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}
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// Function Call iteration
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typedef std::list<DSCallSite>::const_iterator fc_iterator;
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fc_iterator fc_begin() const { return FunctionCalls.begin(); }
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fc_iterator fc_end() const { return FunctionCalls.end(); }
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// Aux Function Call iteration
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typedef std::list<DSCallSite>::const_iterator afc_iterator;
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afc_iterator afc_begin() const { return AuxFunctionCalls.begin(); }
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afc_iterator afc_end() const { return AuxFunctionCalls.end(); }
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/// getNodeForValue - Given a value that is used or defined in the body of the
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/// current function, return the DSNode that it points to.
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///
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DSNodeHandle &getNodeForValue(Value *V) { return ScalarMap[V]; }
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const DSNodeHandle &getNodeForValue(Value *V) const {
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ScalarMapTy::const_iterator I = ScalarMap.find(V);
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assert(I != ScalarMap.end() &&
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"Use non-const lookup function if node may not be in the map");
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return I->second;
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}
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/// retnodes_* iterator methods: expose iteration over return nodes in the
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/// graph, which are also the set of functions incorporated in this graph.
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typedef ReturnNodesTy::const_iterator retnodes_iterator;
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retnodes_iterator retnodes_begin() const { return ReturnNodes.begin(); }
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retnodes_iterator retnodes_end() const { return ReturnNodes.end(); }
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/// getReturnNodes - Return the mapping of functions to their return nodes for
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/// this graph.
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///
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const ReturnNodesTy &getReturnNodes() const { return ReturnNodes; }
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ReturnNodesTy &getReturnNodes() { return ReturnNodes; }
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/// getReturnNodeFor - Return the return node for the specified function.
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///
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DSNodeHandle &getReturnNodeFor(Function &F) {
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ReturnNodesTy::iterator I = ReturnNodes.find(&F);
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assert(I != ReturnNodes.end() && "F not in this DSGraph!");
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return I->second;
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}
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const DSNodeHandle &getReturnNodeFor(Function &F) const {
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ReturnNodesTy::const_iterator I = ReturnNodes.find(&F);
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assert(I != ReturnNodes.end() && "F not in this DSGraph!");
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return I->second;
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}
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/// containsFunction - Return true if this DSGraph contains information for
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/// the specified function.
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bool containsFunction(Function *F) const {
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return ReturnNodes.count(F);
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}
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/// getGraphSize - Return the number of nodes in this graph.
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///
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unsigned getGraphSize() const {
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return Nodes.size();
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}
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/// addObjectToGraph - This method can be used to add global, stack, and heap
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/// objects to the graph. This can be used when updating DSGraphs due to the
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/// introduction of new temporary objects. The new object is not pointed to
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/// and does not point to any other objects in the graph. Note that this
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/// method initializes the type of the DSNode to the declared type of the
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/// object if UseDeclaredType is true, otherwise it leaves the node type as
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/// void.
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DSNode *addObjectToGraph(Value *Ptr, bool UseDeclaredType = true);
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/// print - Print a dot graph to the specified ostream...
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///
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void print(std::ostream &O) const;
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/// dump - call print(std::cerr), for use from the debugger...
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///
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void dump() const;
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/// viewGraph - Emit a dot graph, run 'dot', run gv on the postscript file,
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/// then cleanup. For use from the debugger.
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///
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void viewGraph() const;
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void writeGraphToFile(std::ostream &O, const std::string &GraphName) const;
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/// maskNodeTypes - Apply a mask to all of the node types in the graph. This
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/// is useful for clearing out markers like Incomplete.
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///
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void maskNodeTypes(unsigned Mask) {
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for (node_iterator I = node_begin(), E = node_end(); I != E; ++I)
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I->maskNodeTypes(Mask);
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}
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void maskIncompleteMarkers() { maskNodeTypes(~DSNode::Incomplete); }
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// markIncompleteNodes - Traverse the graph, identifying nodes that may be
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// modified by other functions that have not been resolved yet. This marks
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// nodes that are reachable through three sources of "unknownness":
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// Global Variables, Function Calls, and Incoming Arguments
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//
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// For any node that may have unknown components (because something outside
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// the scope of current analysis may have modified it), the 'Incomplete' flag
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// is added to the NodeType.
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//
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enum MarkIncompleteFlags {
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MarkFormalArgs = 1, IgnoreFormalArgs = 0,
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IgnoreGlobals = 2, MarkGlobalsIncomplete = 0,
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};
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void markIncompleteNodes(unsigned Flags);
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// removeDeadNodes - Use a reachability analysis to eliminate subgraphs that
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// are unreachable. This often occurs because the data structure doesn't
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// "escape" into it's caller, and thus should be eliminated from the caller's
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// graph entirely. This is only appropriate to use when inlining graphs.
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//
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enum RemoveDeadNodesFlags {
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RemoveUnreachableGlobals = 1, KeepUnreachableGlobals = 0,
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};
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void removeDeadNodes(unsigned Flags);
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/// CloneFlags enum - Bits that may be passed into the cloneInto method to
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/// specify how to clone the function graph.
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enum CloneFlags {
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StripAllocaBit = 1 << 0, KeepAllocaBit = 0,
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DontCloneCallNodes = 1 << 1, CloneCallNodes = 0,
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DontCloneAuxCallNodes = 1 << 2, CloneAuxCallNodes = 0,
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StripModRefBits = 1 << 3, KeepModRefBits = 0,
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StripIncompleteBit = 1 << 4, KeepIncompleteBit = 0,
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};
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void updateFromGlobalGraph();
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/// computeNodeMapping - Given roots in two different DSGraphs, traverse the
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/// nodes reachable from the two graphs, computing the mapping of nodes from
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/// the first to the second graph.
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///
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static void computeNodeMapping(const DSNodeHandle &NH1,
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const DSNodeHandle &NH2, NodeMapTy &NodeMap,
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bool StrictChecking = true);
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/// computeGToGGMapping - Compute the mapping of nodes in the graph to nodes
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/// in the globals graph.
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void computeGToGGMapping(NodeMapTy &NodeMap);
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/// computeGGToGMapping - Compute the mapping of nodes in the global
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/// graph to nodes in this graph.
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void computeGGToGMapping(InvNodeMapTy &InvNodeMap);
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/// computeCalleeCallerMapping - Given a call from a function in the current
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/// graph to the 'Callee' function (which lives in 'CalleeGraph'), compute the
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/// mapping of nodes from the callee to nodes in the caller.
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void computeCalleeCallerMapping(DSCallSite CS, const Function &Callee,
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DSGraph &CalleeGraph, NodeMapTy &NodeMap);
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/// cloneInto - Clone the specified DSGraph into the current graph. The
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/// translated ScalarMap for the old function is filled into the OldValMap
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/// member, and the translated ReturnNodes map is returned into ReturnNodes.
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/// OldNodeMap contains a mapping from the original nodes to the newly cloned
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/// nodes.
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///
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/// The CloneFlags member controls various aspects of the cloning process.
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///
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void cloneInto(const DSGraph &G, ScalarMapTy &OldValMap,
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ReturnNodesTy &OldReturnNodes, NodeMapTy &OldNodeMap,
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unsigned CloneFlags = 0);
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/// getFunctionArgumentsForCall - Given a function that is currently in this
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/// graph, return the DSNodeHandles that correspond to the pointer-compatible
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/// function arguments. The vector is filled in with the return value (or
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/// null if it is not pointer compatible), followed by all of the
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/// pointer-compatible arguments.
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void getFunctionArgumentsForCall(Function *F,
|
|
std::vector<DSNodeHandle> &Args) const;
|
|
|
|
/// mergeInGraph - This graph merges in the minimal number of
|
|
/// nodes from G2 into 'this' graph, merging the bindings specified by the
|
|
/// call site (in this graph) with the bindings specified by the vector in G2.
|
|
/// If the StripAlloca's argument is 'StripAllocaBit' then Alloca markers are
|
|
/// removed from nodes.
|
|
///
|
|
void mergeInGraph(const DSCallSite &CS, std::vector<DSNodeHandle> &Args,
|
|
const DSGraph &G2, unsigned CloneFlags);
|
|
|
|
/// mergeInGraph - This method is the same as the above method, but the
|
|
/// argument bindings are provided by using the formal arguments of F.
|
|
///
|
|
void mergeInGraph(const DSCallSite &CS, Function &F, const DSGraph &Graph,
|
|
unsigned CloneFlags);
|
|
|
|
/// getCallSiteForArguments - Get the arguments and return value bindings for
|
|
/// the specified function in the current graph.
|
|
///
|
|
DSCallSite getCallSiteForArguments(Function &F) const;
|
|
|
|
/// getDSCallSiteForCallSite - Given an LLVM CallSite object that is live in
|
|
/// the context of this graph, return the DSCallSite for it.
|
|
DSCallSite getDSCallSiteForCallSite(CallSite CS) const;
|
|
|
|
// Methods for checking to make sure graphs are well formed...
|
|
void AssertNodeInGraph(const DSNode *N) const {
|
|
assert((!N || N->getParentGraph() == this) &&
|
|
"AssertNodeInGraph: Node is not in graph!");
|
|
}
|
|
void AssertNodeContainsGlobal(const DSNode *N, GlobalValue *GV) const;
|
|
|
|
void AssertCallSiteInGraph(const DSCallSite &CS) const;
|
|
void AssertCallNodesInGraph() const;
|
|
void AssertAuxCallNodesInGraph() const;
|
|
|
|
void AssertGraphOK() const;
|
|
|
|
/// removeTriviallyDeadNodes - After the graph has been constructed, this
|
|
/// method removes all unreachable nodes that are created because they got
|
|
/// merged with other nodes in the graph. This is used as the first step of
|
|
/// removeDeadNodes.
|
|
///
|
|
void removeTriviallyDeadNodes();
|
|
};
|
|
|
|
|
|
/// ReachabilityCloner - This class is used to incrementally clone and merge
|
|
/// nodes from a non-changing source graph into a potentially mutating
|
|
/// destination graph. Nodes are only cloned over on demand, either in
|
|
/// responds to a merge() or getClonedNH() call. When a node is cloned over,
|
|
/// all of the nodes reachable from it are automatically brought over as well.
|
|
///
|
|
class ReachabilityCloner {
|
|
DSGraph &Dest;
|
|
const DSGraph &Src;
|
|
|
|
/// BitsToKeep - These bits are retained from the source node when the
|
|
/// source nodes are merged into the destination graph.
|
|
unsigned BitsToKeep;
|
|
unsigned CloneFlags;
|
|
|
|
// NodeMap - A mapping from nodes in the source graph to the nodes that
|
|
// represent them in the destination graph.
|
|
DSGraph::NodeMapTy NodeMap;
|
|
public:
|
|
ReachabilityCloner(DSGraph &dest, const DSGraph &src, unsigned cloneFlags)
|
|
: Dest(dest), Src(src), CloneFlags(cloneFlags) {
|
|
assert(&Dest != &Src && "Cannot clone from graph to same graph!");
|
|
BitsToKeep = ~DSNode::DEAD;
|
|
if (CloneFlags & DSGraph::StripAllocaBit)
|
|
BitsToKeep &= ~DSNode::AllocaNode;
|
|
if (CloneFlags & DSGraph::StripModRefBits)
|
|
BitsToKeep &= ~(DSNode::Modified | DSNode::Read);
|
|
if (CloneFlags & DSGraph::StripIncompleteBit)
|
|
BitsToKeep &= ~DSNode::Incomplete;
|
|
}
|
|
|
|
DSNodeHandle getClonedNH(const DSNodeHandle &SrcNH);
|
|
|
|
void merge(const DSNodeHandle &NH, const DSNodeHandle &SrcNH);
|
|
|
|
/// mergeCallSite - Merge the nodes reachable from the specified src call
|
|
/// site into the nodes reachable from DestCS.
|
|
///
|
|
void mergeCallSite(const DSCallSite &DestCS, const DSCallSite &SrcCS);
|
|
|
|
bool clonedAnyNodes() const { return !NodeMap.empty(); }
|
|
|
|
/// hasClonedNode - Return true if the specified node has been cloned from
|
|
/// the source graph into the destination graph.
|
|
bool hasClonedNode(const DSNode *N) {
|
|
return NodeMap.count(N);
|
|
}
|
|
|
|
void destroy() { NodeMap.clear(); }
|
|
};
|
|
|
|
} // End llvm namespace
|
|
|
|
#endif
|