#ifndef LLVM_ANALYSIS_CALLGRAPH_H
#define LLVM_ANALYSIS_CALLGRAPH_H
+#include "llvm/Function.h"
+#include "llvm/Pass.h"
#include "llvm/ADT/GraphTraits.h"
#include "llvm/ADT/STLExtras.h"
-#include "llvm/Pass.h"
#include "llvm/Support/CallSite.h"
+#include "llvm/Support/ValueHandle.h"
#include "llvm/System/IncludeFile.h"
#include <map>
public:
static char ID; // Class identification, replacement for typeinfo
//===---------------------------------------------------------------------
- // Accessors...
+ // Accessors.
//
typedef FunctionMapTy::iterator iterator;
typedef FunctionMapTy::const_iterator const_iterator;
/// 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; }
+ virtual CallGraphNode* getCallsExternalNode() const { return 0; }
/// Return the root/main method in the module, or some other root node, such
/// as the externalcallingnode. Overload these if you behavioral
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.
CallGraphNode *getOrInsertFunction(const Function *F);
//===---------------------------------------------------------------------
- // Pass infrastructure interface glue code...
+ // Pass infrastructure interface glue code.
//
protected:
CallGraph() {}
///
void initialize(Module &M);
- 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, Module *) const;
void dump() const;
-
protected:
// destroy - Release memory for the call graph
virtual void destroy();
};
//===----------------------------------------------------------------------===//
-// CallGraphNode class definition
+// CallGraphNode class definition.
//
class CallGraphNode {
- Function *F;
- typedef std::pair<CallSite,CallGraphNode*> CallRecord;
+ AssertingVH<Function> F;
+
+ // CallRecord - This is a pair of the calling instruction (a call or invoke)
+ // and the callgraph node being called.
+public:
+ typedef std::pair<WeakVH, CallGraphNode*> CallRecord;
+private:
std::vector<CallRecord> CalledFunctions;
-
- CallGraphNode(const CallGraphNode &); // Do not implement
+
+ /// NumReferences - This is the number of times that this CallGraphNode occurs
+ /// in the CalledFunctions array of this or other CallGraphNodes.
+ unsigned NumReferences;
+
+ CallGraphNode(const CallGraphNode &); // DO NOT IMPLEMENT
+ void operator=(const CallGraphNode &); // DO NOT IMPLEMENT
+
+ void DropRef() { --NumReferences; }
+ void AddRef() { ++NumReferences; }
public:
typedef std::vector<CallRecord> CalledFunctionsVector;
+
+ // CallGraphNode ctor - Create a node for the specified function.
+ inline CallGraphNode(Function *f) : F(f), NumReferences(0) {}
+ ~CallGraphNode() {
+ assert(NumReferences == 0 && "Node deleted while references remain");
+ }
+
//===---------------------------------------------------------------------
- // Accessor methods...
+ // Accessor methods.
//
typedef std::vector<CallRecord>::iterator iterator;
typedef std::vector<CallRecord>::const_iterator const_iterator;
- // getFunction - Return the function that this call graph node represents...
+ // getFunction - Return the function that this call graph node represents.
Function *getFunction() const { return F; }
inline iterator begin() { return CalledFunctions.begin(); }
inline bool empty() const { return CalledFunctions.empty(); }
inline unsigned size() const { return (unsigned)CalledFunctions.size(); }
- // Subscripting operator - Return the i'th called function...
+ /// getNumReferences - Return the number of other CallGraphNodes in this
+ /// CallGraph that reference this node in their callee list.
+ unsigned getNumReferences() const { return NumReferences; }
+
+ // Subscripting operator - Return 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.
///
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
/// removeAllCalledFunctions - As the name implies, this 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();
+ }
}
+
+ /// stealCalledFunctionsFrom - Move 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);
+ }
+
/// addCalledFunction - Add 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));
+ CalledFunctions.push_back(std::make_pair(CS.getInstruction(), M));
+ M->AddRef();
}
+ 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.
/// removeOneAbstractEdgeTo - Remove one edge associated with a null callsite
/// from this node to the specified callee function.
void removeOneAbstractEdgeTo(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);
-
- friend class CallGraph;
-
- // CallGraphNode ctor - Create a node for the specified function.
- inline CallGraphNode(Function *f) : F(f) {}
+
+ /// replaceCallEdge - This method 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);
+
+ /// allReferencesDropped - This is a special function that should only be
+ /// used by the CallGraph class.
+ void allReferencesDropped() {
+ NumReferences = 0;
+ }
};
//===----------------------------------------------------------------------===//
template <> struct GraphTraits<CallGraphNode*> {
typedef CallGraphNode NodeType;
- typedef std::pair<CallSite, CallGraphNode*> CGNPairTy;
+ typedef CallGraphNode::CallRecord CGNPairTy;
typedef std::pointer_to_unary_function<CGNPairTy, CallGraphNode*> CGNDerefFun;
static NodeType *getEntryNode(CallGraphNode *CGN) { return CGN; }
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