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//===-- EquivClassGraphs.h - Merge equiv-class graphs -----------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This pass is the same as the complete bottom-up graphs, but with functions
// partitioned into equivalence classes and a single merged DS graph for all
// functions in an equivalence class. After this merging, graphs are inlined
// bottom-up on the SCCs of the final (CBU) call graph.
//
//===----------------------------------------------------------------------===//
#include "llvm/Analysis/DataStructure/DataStructure.h"
#include "llvm/Analysis/DataStructure/DSGraph.h"
#include "llvm/ADT/EquivalenceClasses.h"
#include "llvm/ADT/STLExtras.h"
#include <vector>
#include <map>
#include <ext/hash_map>
namespace llvm {
class Module;
class Function;
/// EquivClassGraphs - This is the same as the complete bottom-up graphs, but
/// with functions partitioned into equivalence classes and a single merged
/// DS graph for all functions in an equivalence class. After this merging,
/// graphs are inlined bottom-up on the SCCs of the final (CBU) call graph.
///
struct EquivClassGraphs : public ModulePass {
CompleteBUDataStructures *CBU;
DSGraph *GlobalsGraph;
// DSInfo - one graph for each function.
hash_map<const Function*, DSGraph*> DSInfo;
/// ActualCallees - The actual functions callable from indirect call sites.
///
hash_multimap<Instruction*, Function*> ActualCallees;
// Equivalence class where functions that can potentially be called via the
// same function pointer are in the same class.
EquivalenceClasses<Function*> FuncECs;
/// OneCalledFunction - For each indirect call, we keep track of one
/// target of the call. This is used to find equivalence class called by
/// a call site.
std::map<DSNode*, Function *> OneCalledFunction;
public:
/// EquivClassGraphs - Computes the equivalence classes and then the
/// folded DS graphs for each class.
///
virtual bool runOnModule(Module &M);
/// getDSGraph - Return the data structure graph for the specified function.
/// This returns the folded graph. The folded graph is the same as the CBU
/// graph iff the function is in a singleton equivalence class AND all its
/// callees also have the same folded graph as the CBU graph.
///
DSGraph &getDSGraph(const Function &F) const {
hash_map<const Function*, DSGraph*>::const_iterator I = DSInfo.find(&F);
assert(I != DSInfo.end() && "No graph computed for that function!");
return *I->second;
}
/// ContainsDSGraphFor - Return true if we have a graph for the specified
/// function.
bool ContainsDSGraphFor(const Function &F) const {
return DSInfo.find(&F) != DSInfo.end();
}
/// getSomeCalleeForCallSite - Return any one callee function at
/// a call site.
///
Function *getSomeCalleeForCallSite(const CallSite &CS) const;
DSGraph &getGlobalsGraph() const {
return *GlobalsGraph;
}
typedef hash_multimap<Instruction*, Function*> ActualCalleesTy;
const ActualCalleesTy &getActualCallees() const {
return ActualCallees;
}
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
AU.setPreservesAll();
AU.addRequired<CompleteBUDataStructures>();
}
private:
void buildIndirectFunctionSets(Module &M);
unsigned processSCC(DSGraph &FG, std::vector<DSGraph*> &Stack,
unsigned &NextID,
std::map<DSGraph*, unsigned> &ValMap);
void processGraph(DSGraph &FG);
DSGraph &getOrCreateGraph(Function &F);
};
}; // end llvm namespace
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