//
// 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 file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
#include "llvm/Analysis/CallGraph.h"
#include "llvm/Module.h"
#include "llvm/Instructions.h"
+#include "llvm/IntrinsicInst.h"
#include "llvm/Support/CallSite.h"
-#include "llvm/Support/Streams.h"
-#include <ostream>
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/raw_ostream.h"
using namespace llvm;
-/// isOnlyADirectCall - Return true if this callsite is *just* a direct call to
-/// the specified function. Specifically return false if the callsite also
-/// takes the address of the function.
-static bool isOnlyADirectCall(Function *F, CallSite CS) {
- if (!CS.getInstruction()) return false;
- for (CallSite::arg_iterator I = CS.arg_begin(), E = CS.arg_end(); I != E; ++I)
- if (*I == F) return false;
- return true;
-}
-
namespace {
//===----------------------------------------------------------------------===//
// BasicCallGraph class definition
//
-class BasicCallGraph : public CallGraph, public ModulePass {
+class BasicCallGraph : public ModulePass, public CallGraph {
// Root is root of the call graph, or the external node if a 'main' function
// couldn't be found.
//
CallGraphNode *CallsExternalNode;
public:
- BasicCallGraph() : Root(0), ExternalCallingNode(0), CallsExternalNode(0) {}
+ static char ID; // Class identification, replacement for typeinfo
+ BasicCallGraph() : ModulePass(ID), Root(0),
+ ExternalCallingNode(0), CallsExternalNode(0) {
+ initializeBasicCallGraphPass(*PassRegistry::getPassRegistry());
+ }
// runOnModule - Compute the call graph for the specified module.
virtual bool runOnModule(Module &M) {
CallsExternalNode = new CallGraphNode(0);
Root = 0;
- // Add every function to the call graph...
+ // Add every function to the call graph.
for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
addToCallGraph(I);
AU.setPreservesAll();
}
- void print(std::ostream *o, const Module *M) const {
- if (o) print(*o, M);
- }
-
- virtual void print(std::ostream &o, const Module *M) const {
- o << "CallGraph Root is: ";
+ virtual void print(raw_ostream &OS, const Module *) const {
+ OS << "CallGraph Root is: ";
if (Function *F = getRoot()->getFunction())
- o << F->getName() << "\n";
- else
- o << "<<null function: 0x" << getRoot() << ">>\n";
+ OS << F->getName() << "\n";
+ else {
+ OS << "<<null function: 0x" << getRoot() << ">>\n";
+ }
- CallGraph::print(o, M);
+ CallGraph::print(OS, 0);
}
virtual void releaseMemory() {
destroy();
}
- /// dump - Print out this call graph.
- ///
- inline void dump() const {
- print(cerr, Mod);
+ /// getAdjustedAnalysisPointer - This method is used when a pass implements
+ /// an analysis interface through multiple inheritance. If needed, it should
+ /// override this to adjust the this pointer as needed for the specified pass
+ /// info.
+ virtual void *getAdjustedAnalysisPointer(AnalysisID PI) {
+ if (PI == &CallGraph::ID)
+ return (CallGraph*)this;
+ return this;
}
-
+
CallGraphNode* getExternalCallingNode() const { return ExternalCallingNode; }
CallGraphNode* getCallsExternalNode() const { return CallsExternalNode; }
CallGraphNode *Node = getOrInsertFunction(F);
// If this function has external linkage, anything could call it.
- if (!F->hasInternalLinkage()) {
+ if (!F->hasLocalLinkage()) {
ExternalCallingNode->addCalledFunction(CallSite(), Node);
// Found the entry point?
}
}
+ // If this function has its address taken, anything could call it.
+ if (F->hasAddressTaken())
+ ExternalCallingNode->addCalledFunction(CallSite(), Node);
+
// If this function is not defined in this translation unit, it could call
// anything.
- if (F->isDeclaration() && !F->getIntrinsicID())
+ if (F->isDeclaration() && !F->isIntrinsic())
Node->addCalledFunction(CallSite(), CallsExternalNode);
- // Loop over all of the users of the function... looking for callers...
- //
- bool isUsedExternally = false;
- for (Value::use_iterator I = F->use_begin(), E = F->use_end(); I != E; ++I){
- if (Instruction *Inst = dyn_cast<Instruction>(*I)) {
- CallSite CS = CallSite::get(Inst);
- if (isOnlyADirectCall(F, CS))
- getOrInsertFunction(Inst->getParent()->getParent())
- ->addCalledFunction(CS, Node);
- else
- isUsedExternally = true;
- } else if (GlobalValue *GV = dyn_cast<GlobalValue>(*I)) {
- for (Value::use_iterator I = GV->use_begin(), E = GV->use_end();
- I != E; ++I)
- if (Instruction *Inst = dyn_cast<Instruction>(*I)) {
- CallSite CS = CallSite::get(Inst);
- if (isOnlyADirectCall(F, CS))
- getOrInsertFunction(Inst->getParent()->getParent())
- ->addCalledFunction(CS, Node);
- else
- isUsedExternally = true;
- } else {
- isUsedExternally = true;
- }
- } else { // Can't classify the user!
- isUsedExternally = true;
- }
- }
- if (isUsedExternally)
- ExternalCallingNode->addCalledFunction(CallSite(), Node);
-
- // Look for an indirect function call.
+ // Look for calls by this function.
for (Function::iterator BB = F->begin(), BBE = F->end(); BB != BBE; ++BB)
for (BasicBlock::iterator II = BB->begin(), IE = BB->end();
II != IE; ++II) {
- CallSite CS = CallSite::get(II);
- if (CS.getInstruction() && !CS.getCalledFunction())
- Node->addCalledFunction(CS, CallsExternalNode);
+ CallSite CS(cast<Value>(II));
+ if (CS && !isa<IntrinsicInst>(II)) {
+ const Function *Callee = CS.getCalledFunction();
+ if (Callee)
+ Node->addCalledFunction(CS, getOrInsertFunction(Callee));
+ else
+ Node->addCalledFunction(CS, CallsExternalNode);
+ }
}
}
// destroy - Release memory for the call graph
virtual void destroy() {
/// CallsExternalNode is not in the function map, delete it explicitly.
- delete CallsExternalNode;
- CallsExternalNode = 0;
+ if (CallsExternalNode) {
+ CallsExternalNode->allReferencesDropped();
+ delete CallsExternalNode;
+ CallsExternalNode = 0;
+ }
CallGraph::destroy();
}
};
-RegisterAnalysisGroup<CallGraph> X("Call Graph");
-RegisterPass<BasicCallGraph> Y("basiccg", "Basic CallGraph Construction");
-RegisterAnalysisGroup<CallGraph, true> Z(Y);
-
} //End anonymous namespace
+INITIALIZE_ANALYSIS_GROUP(CallGraph, "Call Graph", BasicCallGraph)
+INITIALIZE_AG_PASS(BasicCallGraph, CallGraph, "basiccg",
+ "Basic CallGraph Construction", false, true, true)
+
+char CallGraph::ID = 0;
+char BasicCallGraph::ID = 0;
+
void CallGraph::initialize(Module &M) {
Mod = &M;
}
void CallGraph::destroy() {
- if (!FunctionMap.empty()) {
- for (FunctionMapTy::iterator I = FunctionMap.begin(), E = FunctionMap.end();
- I != E; ++I)
- delete I->second;
- FunctionMap.clear();
- }
+ if (FunctionMap.empty()) return;
+
+ // Reset all node's use counts to zero before deleting them to prevent an
+ // assertion from firing.
+#ifndef NDEBUG
+ for (FunctionMapTy::iterator I = FunctionMap.begin(), E = FunctionMap.end();
+ I != E; ++I)
+ I->second->allReferencesDropped();
+#endif
+
+ for (FunctionMapTy::iterator I = FunctionMap.begin(), E = FunctionMap.end();
+ I != E; ++I)
+ delete I->second;
+ FunctionMap.clear();
}
-void CallGraph::print(std::ostream &OS, const Module *M) const {
+void CallGraph::print(raw_ostream &OS, Module*) const {
for (CallGraph::const_iterator I = begin(), E = end(); I != E; ++I)
I->second->print(OS);
}
-
void CallGraph::dump() const {
- print(cerr, 0);
+ print(dbgs(), 0);
}
//===----------------------------------------------------------------------===//
// is to dropAllReferences before calling this.
//
Function *CallGraph::removeFunctionFromModule(CallGraphNode *CGN) {
- assert(CGN->CalledFunctions.empty() && "Cannot remove function from call "
+ assert(CGN->empty() && "Cannot remove function from call "
"graph if it references other functions!");
Function *F = CGN->getFunction(); // Get the function for the call graph node
delete CGN; // Delete the call graph node for this func
return 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 CallGraph::changeFunction(Function *OldF, Function *NewF) {
- iterator I = FunctionMap.find(OldF);
- CallGraphNode *&New = FunctionMap[NewF];
- assert(I != FunctionMap.end() && I->second && !New &&
- "OldF didn't exist in CG or NewF already does!");
- New = I->second;
- New->F = NewF;
+/// spliceFunction - 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 the old function to the new while also updating all
+/// callers from old to new.
+///
+void CallGraph::spliceFunction(const Function *From, const Function *To) {
+ assert(FunctionMap.count(From) && "No CallGraphNode for function!");
+ assert(!FunctionMap.count(To) &&
+ "Pointing CallGraphNode at a function that already exists");
+ FunctionMapTy::iterator I = FunctionMap.find(From);
+ I->second->F = const_cast<Function*>(To);
+ FunctionMap[To] = I->second;
FunctionMap.erase(I);
}
return CGN = new CallGraphNode(const_cast<Function*>(F));
}
-void CallGraphNode::print(std::ostream &OS) const {
+void CallGraphNode::print(raw_ostream &OS) const {
if (Function *F = getFunction())
- OS << "Call graph node for function: '" << F->getName() <<"'\n";
+ OS << "Call graph node for function: '" << F->getName() << "'";
else
- OS << "Call graph node <<null function: 0x" << this << ">>:\n";
+ OS << "Call graph node <<null function>>";
+
+ OS << "<<" << this << ">> #uses=" << getNumReferences() << '\n';
- for (const_iterator I = begin(), E = end(); I != E; ++I)
- if (I->second->getFunction())
- OS << " Calls function '" << I->second->getFunction()->getName() <<"'\n";
- else
- OS << " Calls external node\n";
- OS << "\n";
+ for (const_iterator I = begin(), E = end(); I != E; ++I) {
+ OS << " CS<" << I->first << "> calls ";
+ if (Function *FI = I->second->getFunction())
+ OS << "function '" << FI->getName() <<"'\n";
+ else
+ OS << "external node\n";
+ }
+ OS << '\n';
}
-void CallGraphNode::dump() const { print(cerr); }
-
-void CallGraphNode::removeCallEdgeTo(CallGraphNode *Callee) {
- for (unsigned i = CalledFunctions.size(); ; --i) {
- assert(i && "Cannot find callee to remove!");
- if (CalledFunctions[i-1].second == Callee) {
- CalledFunctions.erase(CalledFunctions.begin()+i-1);
+void CallGraphNode::dump() const { print(dbgs()); }
+
+/// 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.
+void CallGraphNode::removeCallEdgeFor(CallSite CS) {
+ for (CalledFunctionsVector::iterator I = CalledFunctions.begin(); ; ++I) {
+ assert(I != CalledFunctions.end() && "Cannot find callsite to remove!");
+ if (I->first == CS.getInstruction()) {
+ I->second->DropRef();
+ *I = CalledFunctions.back();
+ CalledFunctions.pop_back();
return;
}
}
void CallGraphNode::removeAnyCallEdgeTo(CallGraphNode *Callee) {
for (unsigned i = 0, e = CalledFunctions.size(); i != e; ++i)
if (CalledFunctions[i].second == Callee) {
+ Callee->DropRef();
CalledFunctions[i] = CalledFunctions.back();
CalledFunctions.pop_back();
--i; --e;
}
}
+/// removeOneAbstractEdgeTo - Remove one edge associated with a null callsite
+/// from this node to the specified callee function.
+void CallGraphNode::removeOneAbstractEdgeTo(CallGraphNode *Callee) {
+ for (CalledFunctionsVector::iterator I = CalledFunctions.begin(); ; ++I) {
+ assert(I != CalledFunctions.end() && "Cannot find callee to remove!");
+ CallRecord &CR = *I;
+ if (CR.second == Callee && CR.first == 0) {
+ Callee->DropRef();
+ *I = CalledFunctions.back();
+ CalledFunctions.pop_back();
+ return;
+ }
+ }
+}
+
+/// 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 CallGraphNode::replaceCallEdge(CallSite CS,
+ CallSite NewCS, CallGraphNode *NewNode){
+ for (CalledFunctionsVector::iterator I = CalledFunctions.begin(); ; ++I) {
+ assert(I != CalledFunctions.end() && "Cannot find callsite to remove!");
+ if (I->first == CS.getInstruction()) {
+ I->second->DropRef();
+ I->first = NewCS.getInstruction();
+ I->second = NewNode;
+ NewNode->AddRef();
+ return;
+ }
+ }
+}
+
// Enuse that users of CallGraph.h also link with this file
DEFINING_FILE_FOR(CallGraph)
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