//
// 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/Module.h"
#include "llvm/Instructions.h"
#include "llvm/Support/CallSite.h"
-#include <iostream>
+#include "llvm/Support/Compiler.h"
+#include "llvm/Support/Streams.h"
+#include <ostream>
using namespace llvm;
-void llvm::BasicCallGraphStub() {}
-
-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 VISIBILITY_HIDDEN BasicCallGraph : public CallGraph, public ModulePass {
// 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) {}
- ~BasicCallGraph() { destroy(); }
+ static char ID; // Class identification, replacement for typeinfo
+ BasicCallGraph() : ModulePass(&ID), Root(0),
+ ExternalCallingNode(0), CallsExternalNode(0) {}
// runOnModule - Compute the call graph for the specified module.
virtual bool runOnModule(Module &M) {
- destroy();
CallGraph::initialize(M);
ExternalCallingNode = getOrInsertFunction(0);
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: ";
if (Function *F = getRoot()->getFunction())
/// dump - Print out this call graph.
///
inline void dump() const {
- print(std::cerr, Mod);
+ print(cerr, Mod);
}
CallGraphNode* getExternalCallingNode() const { return ExternalCallingNode; }
void addToCallGraph(Function *F) {
CallGraphNode *Node = getOrInsertFunction(F);
- // If this function has external linkage, anything could call it...
+ // If this function has external linkage, anything could call it.
if (!F->hasInternalLinkage()) {
- ExternalCallingNode->addCalledFunction(Node);
+ ExternalCallingNode->addCalledFunction(CallSite(), Node);
// Found the entry point?
if (F->getName() == "main") {
// If this function is not defined in this translation unit, it could call
// anything.
- if (F->isExternal() && !F->getIntrinsicID())
- Node->addCalledFunction(CallsExternalNode);
+ if (F->isDeclaration() && !F->isIntrinsic())
+ Node->addCalledFunction(CallSite(), CallsExternalNode);
- // Loop over all of the users of the function... looking for callers...
- //
+ // Loop over all of the users of the function, looking for non-call uses.
bool isUsedExternally = false;
- for (Value::use_iterator I = F->use_begin(), E = F->use_end(); I != E; ++I){
+ for (Value::use_iterator I = F->use_begin(), E = F->use_end();
+ I != E && !isUsedExternally; ++I) {
if (Instruction *Inst = dyn_cast<Instruction>(*I)) {
- if (isOnlyADirectCall(F, CallSite::get(Inst)))
- getOrInsertFunction(Inst->getParent()->getParent())
- ->addCalledFunction(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)) {
- if (isOnlyADirectCall(F, CallSite::get(Inst)))
- getOrInsertFunction(Inst->getParent()->getParent())
- ->addCalledFunction(Node);
- else
- isUsedExternally = true;
- } else {
- isUsedExternally = true;
- }
- } else { // Can't classify the user!
+ CallSite CS = CallSite::get(Inst);
+ // Not a call? Or F being passed as a parameter not as the callee?
+ isUsedExternally = !CS.getInstruction() || I.getOperandNo();
+ } else { // User is not a direct call!
isUsedExternally = true;
}
}
if (isUsedExternally)
- ExternalCallingNode->addCalledFunction(Node);
+ 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(CallsExternalNode);
+ CallSite CS = CallSite::get(II);
+ if (CS.getInstruction()) {
+ 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() {
- if (!CallsExternalNode) {
- delete CallsExternalNode;
- CallsExternalNode = 0;
- }
+ /// CallsExternalNode is not in the function map, delete it explicitly.
+ delete CallsExternalNode;
+ CallsExternalNode = 0;
+ CallGraph::destroy();
}
};
-RegisterAnalysisGroup<CallGraph> X("Call Graph");
-RegisterOpt<BasicCallGraph> Y("basiccg", "Basic CallGraph Construction");
-RegisterAnalysisGroup<CallGraph, BasicCallGraph, true> Z;
-
} //End anonymous namespace
+static RegisterAnalysisGroup<CallGraph> X("Call Graph");
+static RegisterPass<BasicCallGraph>
+Y("basiccg", "Basic CallGraph Construction", false, true);
+static RegisterAnalysisGroup<CallGraph, true> Z(Y);
+
+char CallGraph::ID = 0;
+char BasicCallGraph::ID = 0;
+
void CallGraph::initialize(Module &M) {
- destroy();
Mod = &M;
}
void CallGraph::destroy() {
- if(!FunctionMap.size()) {
+ if (!FunctionMap.empty()) {
for (FunctionMapTy::iterator I = FunctionMap.begin(), E = FunctionMap.end();
I != E; ++I)
delete I->second;
}
void CallGraph::dump() const {
- print(std::cerr, 0);
+ print(cerr, 0);
}
//===----------------------------------------------------------------------===//
return CGN = new CallGraphNode(const_cast<Function*>(F));
}
-
-
-void CallGraph::stub() {}
-
void CallGraphNode::print(std::ostream &OS) const {
if (Function *F = getFunction())
OS << "Call graph node for function: '" << F->getName() <<"'\n";
OS << "Call graph node <<null function: 0x" << this << ">>:\n";
for (const_iterator I = begin(), E = end(); I != E; ++I)
- if ((*I)->getFunction())
- OS << " Calls function '" << (*I)->getFunction()->getName() << "'\n";
+ if (I->second->getFunction())
+ OS << " Calls function '" << I->second->getFunction()->getName() <<"'\n";
else
OS << " Calls external node\n";
OS << "\n";
}
-void CallGraphNode::dump() const { print(std::cerr); }
+void CallGraphNode::dump() const { print(cerr); }
-void CallGraphNode::removeCallEdgeTo(CallGraphNode *Callee) {
+/// 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 (unsigned i = CalledFunctions.size(); ; --i) {
- assert(i && "Cannot find callee to remove!");
- if (CalledFunctions[i-1] == Callee) {
+ assert(i && "Cannot find callsite to remove!");
+ if (CalledFunctions[i-1].first == CS) {
CalledFunctions.erase(CalledFunctions.begin()+i-1);
return;
}
}
}
+
// 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.
void CallGraphNode::removeAnyCallEdgeTo(CallGraphNode *Callee) {
for (unsigned i = 0, e = CalledFunctions.size(); i != e; ++i)
- if (CalledFunctions[i] == Callee) {
+ if (CalledFunctions[i].second == Callee) {
CalledFunctions[i] = CalledFunctions.back();
CalledFunctions.pop_back();
--i; --e;
}
}
+
+/// 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 CallGraphNode::replaceCallSite(CallSite Old, CallSite New) {
+ for (unsigned i = CalledFunctions.size(); ; --i) {
+ assert(i && "Cannot find callsite to replace!");
+ if (CalledFunctions[i-1].first == Old) {
+ CalledFunctions[i-1].first = New;
+ return;
+ }
+ }
+}
+
+// Enuse that users of CallGraph.h also link with this file
+DEFINING_FILE_FOR(CallGraph)
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