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//===- DataStructure.h - Build data structure 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.
//
//===----------------------------------------------------------------------===//
//
// Implement the LLVM data structure analysis library.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_ANALYSIS_DATA_STRUCTURE_H
#define LLVM_ANALYSIS_DATA_STRUCTURE_H
#include "llvm/Pass.h"
#include "llvm/Target/TargetData.h"
#include "llvm/ADT/hash_set"
namespace llvm {
class Type;
class Instruction;
class DSGraph;
class DSNode;
// FIXME: move this stuff to a private header
namespace DataStructureAnalysis {
/// isPointerType - Return true if this first class type is big enough to hold
/// a pointer.
///
bool isPointerType(const Type *Ty);
}
// LocalDataStructures - The analysis that computes the local data structure
// graphs for all of the functions in the program.
//
// FIXME: This should be a Function pass that can be USED by a Pass, and would
// be automatically preserved. Until we can do that, this is a Pass.
//
class LocalDataStructures : public Pass {
// DSInfo, one graph for each function
hash_map<Function*, DSGraph*> DSInfo;
DSGraph *GlobalsGraph;
public:
~LocalDataStructures() { releaseMemory(); }
virtual bool run(Module &M);
bool hasGraph(const Function &F) const {
return DSInfo.find(const_cast<Function*>(&F)) != DSInfo.end();
}
/// getDSGraph - Return the data structure graph for the specified function.
///
DSGraph &getDSGraph(const Function &F) const {
hash_map<Function*, DSGraph*>::const_iterator I =
DSInfo.find(const_cast<Function*>(&F));
assert(I != DSInfo.end() && "Function not in module!");
return *I->second;
}
DSGraph &getGlobalsGraph() const { return *GlobalsGraph; }
/// print - Print out the analysis results...
///
void print(std::ostream &O, const Module *M) const;
/// releaseMemory - if the pass pipeline is done with this pass, we can
/// release our memory...
///
virtual void releaseMemory();
/// getAnalysisUsage - This obviously provides a data structure graph.
///
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
AU.setPreservesAll();
AU.addRequired<TargetData>();
}
};
/// BUDataStructures - The analysis that computes the interprocedurally closed
/// data structure graphs for all of the functions in the program. This pass
/// only performs a "Bottom Up" propagation (hence the name).
///
class BUDataStructures : public Pass {
protected:
// DSInfo, one graph for each function
hash_map<Function*, DSGraph*> DSInfo;
DSGraph *GlobalsGraph;
hash_multimap<Instruction*, Function*> ActualCallees;
public:
~BUDataStructures() { releaseMemory(); }
virtual bool run(Module &M);
bool hasGraph(const Function &F) const {
return DSInfo.find(const_cast<Function*>(&F)) != DSInfo.end();
}
/// getDSGraph - Return the data structure graph for the specified function.
///
DSGraph &getDSGraph(const Function &F) const {
hash_map<Function*, DSGraph*>::const_iterator I =
DSInfo.find(const_cast<Function*>(&F));
assert(I != DSInfo.end() && "Function not in module!");
return *I->second;
}
DSGraph &getGlobalsGraph() const { return *GlobalsGraph; }
/// print - Print out the analysis results...
///
void print(std::ostream &O, const Module *M) const;
/// releaseMemory - if the pass pipeline is done with this pass, we can
/// release our memory...
///
virtual void releaseMemory();
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
AU.setPreservesAll();
AU.addRequired<LocalDataStructures>();
}
typedef hash_multimap<Instruction*, Function*> ActualCalleesTy;
const ActualCalleesTy &getActualCallees() const {
return ActualCallees;
}
private:
void calculateGraph(DSGraph &G);
void calculateReachableGraphs(Function *F);
DSGraph &getOrCreateGraph(Function *F);
unsigned calculateGraphs(Function *F, std::vector<Function*> &Stack,
unsigned &NextID,
hash_map<Function*, unsigned> &ValMap);
};
/// TDDataStructures - Analysis that computes new data structure graphs
/// for each function using the closed graphs for the callers computed
/// by the bottom-up pass.
///
class TDDataStructures : public Pass {
// DSInfo, one graph for each function
hash_map<Function*, DSGraph*> DSInfo;
hash_set<Function*> ArgsRemainIncomplete;
DSGraph *GlobalsGraph;
public:
~TDDataStructures() { releaseMyMemory(); }
virtual bool run(Module &M);
bool hasGraph(const Function &F) const {
return DSInfo.find(const_cast<Function*>(&F)) != DSInfo.end();
}
/// getDSGraph - Return the data structure graph for the specified function.
///
DSGraph &getDSGraph(const Function &F) const {
hash_map<Function*, DSGraph*>::const_iterator I =
DSInfo.find(const_cast<Function*>(&F));
assert(I != DSInfo.end() && "Function not in module!");
return *I->second;
}
DSGraph &getGlobalsGraph() const { return *GlobalsGraph; }
/// print - Print out the analysis results...
///
void print(std::ostream &O, const Module *M) const;
/// If the pass pipeline is done with this pass, we can release our memory...
///
virtual void releaseMyMemory();
/// getAnalysisUsage - This obviously provides a data structure graph.
///
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
AU.setPreservesAll();
AU.addRequired<BUDataStructures>();
}
private:
void markReachableFunctionsExternallyAccessible(DSNode *N,
hash_set<DSNode*> &Visited);
void inlineGraphIntoCallees(DSGraph &G);
DSGraph &getOrCreateDSGraph(Function &F);
void ComputePostOrder(Function &F, hash_set<DSGraph*> &Visited,
std::vector<DSGraph*> &PostOrder,
const BUDataStructures::ActualCalleesTy &ActualCallees);
};
/// CompleteBUDataStructures - This is the exact same as the bottom-up graphs,
/// but we use take a completed call graph and inline all indirect callees into
/// their callers graphs, making the result more useful for things like pool
/// allocation.
///
struct CompleteBUDataStructures : public BUDataStructures {
virtual bool run(Module &M);
bool hasGraph(const Function &F) const {
return DSInfo.find(const_cast<Function*>(&F)) != DSInfo.end();
}
/// getDSGraph - Return the data structure graph for the specified function.
///
DSGraph &getDSGraph(const Function &F) const {
hash_map<Function*, DSGraph*>::const_iterator I =
DSInfo.find(const_cast<Function*>(&F));
assert(I != DSInfo.end() && "Function not in module!");
return *I->second;
}
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
AU.setPreservesAll();
AU.addRequired<BUDataStructures>();
// FIXME: TEMPORARY (remove once finalization of indirect call sites in the
// globals graph has been implemented in the BU pass)
AU.addRequired<TDDataStructures>();
}
/// print - Print out the analysis results...
///
void print(std::ostream &O, const Module *M) const;
private:
unsigned calculateSCCGraphs(DSGraph &FG, std::vector<DSGraph*> &Stack,
unsigned &NextID,
hash_map<DSGraph*, unsigned> &ValMap);
DSGraph &getOrCreateGraph(Function &F);
void processGraph(DSGraph &G);
};
} // End llvm namespace
#endif
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