X-Git-Url: http://plrg.eecs.uci.edu/git/?p=oota-llvm.git;a=blobdiff_plain;f=include%2Fllvm%2FAnalysis%2FCallGraph.h;h=386b39e6b105582986e73d0b3eee078cfec85030;hp=00c804c4caf8556ed623067cb233ca6d29e3869b;hb=8037485f166c333d82a1174d70121af0f488bce5;hpb=fec2c2bf5ea14679f8a2d74a72bdec76f05fa001 diff --git a/include/llvm/Analysis/CallGraph.h b/include/llvm/Analysis/CallGraph.h index 00c804c4caf..386b39e6b10 100644 --- a/include/llvm/Analysis/CallGraph.h +++ b/include/llvm/Analysis/CallGraph.h @@ -53,9 +53,11 @@ #include "llvm/ADT/GraphTraits.h" #include "llvm/ADT/STLExtras.h" +#include "llvm/IR/Function.h" #include "llvm/Pass.h" #include "llvm/Support/CallSite.h" -#include "llvm/System/IncludeFile.h" +#include "llvm/Support/IncludeFile.h" +#include "llvm/Support/ValueHandle.h" #include namespace llvm { @@ -64,124 +66,156 @@ class Function; class Module; class CallGraphNode; -//===----------------------------------------------------------------------===// -// CallGraph class definition -// -class CallGraph { -protected: - Module *Mod; // The module this call graph represents +/// \brief The basic data container for the call graph and the \c ModulePass +/// which produces it. +/// +/// This class exposes both the interface to the call graph container and the +/// module pass which runs over a module of IR and produces the call graph. +/// +/// The core call graph itself can also be updated to reflect changes to the IR. +class CallGraph : public ModulePass { + Module *M; typedef std::map FunctionMapTy; - FunctionMapTy FunctionMap; // Map from a function to its node + + /// \brief A map from \c Function* to \c CallGraphNode*. + FunctionMapTy FunctionMap; + + /// \brief Root is root of the call graph, or the external node if a 'main' + /// function couldn't be found. + CallGraphNode *Root; + + /// \brief This node has edges to all external functions and those internal + /// functions that have their address taken. + CallGraphNode *ExternalCallingNode; + + /// \brief This node has edges to it from all functions making indirect calls + /// or calling an external function. + CallGraphNode *CallsExternalNode; + + /// \brief Replace the function represented by this node by another. + /// + /// This does not rescan the body of the function, so it is suitable when + /// splicing the body of one function to another while also updating all + /// callers from the old function to the new. + void spliceFunction(const Function *From, const Function *To); + + /// \brief Add a function to the call graph, and link the node to all of the + /// functions that it calls. + void addToCallGraph(Function *F); public: static char ID; // Class identification, replacement for typeinfo - //===--------------------------------------------------------------------- - // Accessors... - // + typedef FunctionMapTy::iterator iterator; typedef FunctionMapTy::const_iterator const_iterator; - /// getModule - Return the module the call graph corresponds to. - /// - Module &getModule() const { return *Mod; } + /// \brief Returns the module the call graph corresponds to. + Module &getModule() const { return *M; } inline iterator begin() { return FunctionMap.begin(); } inline iterator end() { return FunctionMap.end(); } inline const_iterator begin() const { return FunctionMap.begin(); } inline const_iterator end() const { return FunctionMap.end(); } - // Subscripting operators, return the call graph node for the provided - // function + /// \brief Returns the call graph node for the provided function. inline const CallGraphNode *operator[](const Function *F) const { const_iterator I = FunctionMap.find(F); assert(I != FunctionMap.end() && "Function not in callgraph!"); return I->second; } + + /// \brief Returns the call graph node for the provided function. inline CallGraphNode *operator[](const Function *F) { const_iterator I = FunctionMap.find(F); assert(I != FunctionMap.end() && "Function not in callgraph!"); return I->second; } - /// Returns the CallGraphNode which is used to represent undetermined calls - /// into the callgraph. Override this if you want behavioral inheritance. - virtual CallGraphNode* getExternalCallingNode() const { return 0; } + /// \brief Returns the \c CallGraphNode which is used to represent + /// undetermined calls into the callgraph. + CallGraphNode *getExternalCallingNode() const { return ExternalCallingNode; } + + CallGraphNode *getCallsExternalNode() const { return CallsExternalNode; } - /// Return the root/main method in the module, or some other root node, such - /// as the externalcallingnode. Overload these if you behavioral - /// inheritance. - virtual CallGraphNode* getRoot() { return 0; } - virtual const CallGraphNode* getRoot() const { return 0; } + /// \brief Returns the root/main method in the module, or some other root + /// node, such as the externalcallingnode. + CallGraphNode *getRoot() { return Root; } + const CallGraphNode *getRoot() const { return Root; } //===--------------------------------------------------------------------- // Functions to keep a call graph up to date with a function that has been // modified. // - /// removeFunctionFromModule - Unlink the function from this module, returning - /// it. Because this removes the function from the module, the call graph - /// node is destroyed. This is only valid if the function does not call any - /// other functions (ie, there are no edges in it's CGN). The easiest way to - /// do this is to dropAllReferences before calling this. + /// \brief Unlink the function from this module, returning it. /// + /// Because this removes the function from the module, the call graph node is + /// destroyed. This is only valid if the function does not call any other + /// functions (ie, there are no edges in it's CGN). The easiest way to do + /// this is to dropAllReferences before calling this. Function *removeFunctionFromModule(CallGraphNode *CGN); - Function *removeFunctionFromModule(Function *F) { - return removeFunctionFromModule((*this)[F]); - } - /// changeFunction - This method changes the function associated with this - /// CallGraphNode, for use by transformations that need to change the - /// prototype of a Function (thus they must create a new Function and move the - /// old code over). - void changeFunction(Function *OldF, Function *NewF); - - /// getOrInsertFunction - This method is identical to calling operator[], but - /// it will insert a new CallGraphNode for the specified function if one does - /// not already exist. + /// \brief Similar to operator[], but this will insert a new CallGraphNode for + /// \c F if one does not already exist. CallGraphNode *getOrInsertFunction(const Function *F); + CallGraph(); + virtual ~CallGraph() { releaseMemory(); } + //===--------------------------------------------------------------------- - // Pass infrastructure interface glue code... + // Implementation of the ModulePass interface needed here. // -protected: - CallGraph() {} - -public: - virtual ~CallGraph() { destroy(); } - /// initialize - Call this method before calling other methods, - /// re/initializes the state of the CallGraph. - /// - void initialize(Module &M); + virtual void getAnalysisUsage(AnalysisUsage &AU) const; + virtual bool runOnModule(Module &M); + virtual void releaseMemory(); - virtual void print(std::ostream &o, const Module *M) const; - void print(std::ostream *o, const Module *M) const { if (o) print(*o, M); } + void print(raw_ostream &o, const Module *) const; void dump() const; - -protected: - // destroy - Release memory for the call graph - virtual void destroy(); }; -//===----------------------------------------------------------------------===// -// CallGraphNode class definition -// +/// \brief A node in the call graph for a module. +/// +/// Typically represents a function in the call graph. There are also special +/// "null" nodes used to represent theoretical entries in the call graph. class CallGraphNode { - Function *F; - typedef std::pair CallRecord; + friend class CallGraph; + + AssertingVH F; + +public: + /// \brief A pair of the calling instruction (a call or invoke) + /// and the call graph node being called. + typedef std::pair CallRecord; + +private: std::vector CalledFunctions; - CallGraphNode(const CallGraphNode &); // Do not implement + /// \brief The number of times that this CallGraphNode occurs in the + /// CalledFunctions array of this or other CallGraphNodes. + unsigned NumReferences; + + CallGraphNode(const CallGraphNode &) LLVM_DELETED_FUNCTION; + void operator=(const CallGraphNode &) LLVM_DELETED_FUNCTION; + + void DropRef() { --NumReferences; } + void AddRef() { ++NumReferences; } + public: - //===--------------------------------------------------------------------- - // Accessor methods... - // + typedef std::vector CalledFunctionsVector; + + /// \brief Creates a node for the specified function. + inline CallGraphNode(Function *F) : F(F), NumReferences(0) {} + + ~CallGraphNode() { + assert(NumReferences == 0 && "Node deleted while references remain"); + } typedef std::vector::iterator iterator; typedef std::vector::const_iterator const_iterator; - // getFunction - Return the function that this call graph node represents... + /// \brief Returns the function that this call graph node represents. Function *getFunction() const { return F; } inline iterator begin() { return CalledFunctions.begin(); } @@ -191,59 +225,84 @@ public: inline bool empty() const { return CalledFunctions.empty(); } inline unsigned size() const { return (unsigned)CalledFunctions.size(); } - // Subscripting operator - Return the i'th called function... - // + /// \brief Returns the number of other CallGraphNodes in this CallGraph that + /// reference this node in their callee list. + unsigned getNumReferences() const { return NumReferences; } + + /// \brief Returns the i'th called function. CallGraphNode *operator[](unsigned i) const { + assert(i < CalledFunctions.size() && "Invalid index"); return CalledFunctions[i].second; } - /// dump - Print out this call graph node. - /// + /// \brief Print out this call graph node. void dump() const; - void print(std::ostream &OS) const; - void print(std::ostream *OS) const { if (OS) print(*OS); } + void print(raw_ostream &OS) const; //===--------------------------------------------------------------------- // Methods to keep a call graph up to date with a function that has been // modified // - /// removeAllCalledFunctions - As the name implies, this removes all edges - /// from this CallGraphNode to any functions it calls. + /// \brief Removes all edges from this CallGraphNode to any functions it + /// calls. void removeAllCalledFunctions() { - CalledFunctions.clear(); + while (!CalledFunctions.empty()) { + CalledFunctions.back().second->DropRef(); + CalledFunctions.pop_back(); + } } - /// addCalledFunction add a function to the list of functions called by this - /// one. + /// \brief Moves all the callee information from N to this node. + void stealCalledFunctionsFrom(CallGraphNode *N) { + assert(CalledFunctions.empty() && + "Cannot steal callsite information if I already have some"); + std::swap(CalledFunctions, N->CalledFunctions); + } + + /// \brief Adds a function to the list of functions called by this one. void addCalledFunction(CallSite CS, CallGraphNode *M) { - CalledFunctions.push_back(std::make_pair(CS, M)); + assert(!CS.getInstruction() || + !CS.getCalledFunction() || + !CS.getCalledFunction()->isIntrinsic()); + CalledFunctions.push_back(std::make_pair(CS.getInstruction(), M)); + M->AddRef(); } - /// removeCallEdgeTo - This method removes a *single* edge to the specified - /// callee function. Note that this method takes linear time, so it should be - /// used sparingly. - void removeCallEdgeTo(CallGraphNode *Callee); + void removeCallEdge(iterator I) { + I->second->DropRef(); + *I = CalledFunctions.back(); + CalledFunctions.pop_back(); + } - /// removeCallEdgeFor - This method removes the edge in the node for the - /// specified call site. Note that this method takes linear time, so it - /// should be used sparingly. + /// \brief Removes the edge in the node for the specified call site. + /// + /// Note that this method takes linear time, so it should be used sparingly. void removeCallEdgeFor(CallSite CS); - /// removeAnyCallEdgeTo - This method removes any call edges from this node to - /// the specified callee function. This takes more time to execute than - /// removeCallEdgeTo, so it should not be used unless necessary. + /// \brief Removes all call edges from this node to the specified callee + /// function. + /// + /// This takes more time to execute than removeCallEdgeTo, so it should not + /// be used unless necessary. void removeAnyCallEdgeTo(CallGraphNode *Callee); - /// replaceCallSite - Make the edge in the node for Old CallSite be for - /// New CallSite instead. Note that this method takes linear time, so it - /// should be used sparingly. - void replaceCallSite(CallSite Old, CallSite New); + /// \brief Removes one edge associated with a null callsite from this node to + /// the specified callee function. + void removeOneAbstractEdgeTo(CallGraphNode *Callee); - friend class CallGraph; + /// \brief Replaces the edge in the node for the specified call site with a + /// new one. + /// + /// Note that this method takes linear time, so it should be used sparingly. + void replaceCallEdge(CallSite CS, CallSite NewCS, CallGraphNode *NewNode); - // CallGraphNode ctor - Create a node for the specified function. - inline CallGraphNode(Function *f) : F(f) {} + /// \brief A special function that should only be used by the CallGraph class. + // + // FIXME: Make this private? + void allReferencesDropped() { + NumReferences = 0; + } }; //===----------------------------------------------------------------------===// @@ -256,7 +315,7 @@ public: template <> struct GraphTraits { typedef CallGraphNode NodeType; - typedef std::pair CGNPairTy; + typedef CallGraphNode::CallRecord CGNPairTy; typedef std::pointer_to_unary_function CGNDerefFun; static NodeType *getEntryNode(CallGraphNode *CGN) { return CGN; }