mirror of
https://github.com/RPCSX/llvm.git
synced 2024-12-03 01:12:59 +00:00
ce665bd2e2
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@115996 91177308-0d34-0410-b5e6-96231b3b80d8
325 lines
11 KiB
C++
325 lines
11 KiB
C++
//===- CallGraph.cpp - Build a Module's call graph ------------------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file implements the CallGraph class and provides the BasicCallGraph
|
|
// default implementation.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#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/Debug.h"
|
|
#include "llvm/Support/raw_ostream.h"
|
|
using namespace llvm;
|
|
|
|
namespace {
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// BasicCallGraph class definition
|
|
//
|
|
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 *Root;
|
|
|
|
// ExternalCallingNode - This node has edges to all external functions and
|
|
// those internal functions that have their address taken.
|
|
CallGraphNode *ExternalCallingNode;
|
|
|
|
// CallsExternalNode - This node has edges to it from all functions making
|
|
// indirect calls or calling an external function.
|
|
CallGraphNode *CallsExternalNode;
|
|
|
|
public:
|
|
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) {
|
|
CallGraph::initialize(M);
|
|
|
|
ExternalCallingNode = getOrInsertFunction(0);
|
|
CallsExternalNode = new CallGraphNode(0);
|
|
Root = 0;
|
|
|
|
// Add every function to the call graph.
|
|
for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
|
|
addToCallGraph(I);
|
|
|
|
// If we didn't find a main function, use the external call graph node
|
|
if (Root == 0) Root = ExternalCallingNode;
|
|
|
|
return false;
|
|
}
|
|
|
|
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
|
|
AU.setPreservesAll();
|
|
}
|
|
|
|
virtual void print(raw_ostream &OS, const Module *) const {
|
|
OS << "CallGraph Root is: ";
|
|
if (Function *F = getRoot()->getFunction())
|
|
OS << F->getName() << "\n";
|
|
else {
|
|
OS << "<<null function: 0x" << getRoot() << ">>\n";
|
|
}
|
|
|
|
CallGraph::print(OS, 0);
|
|
}
|
|
|
|
virtual void releaseMemory() {
|
|
destroy();
|
|
}
|
|
|
|
/// 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; }
|
|
|
|
// getRoot - Return the root of the call graph, which is either main, or if
|
|
// main cannot be found, the external node.
|
|
//
|
|
CallGraphNode *getRoot() { return Root; }
|
|
const CallGraphNode *getRoot() const { return Root; }
|
|
|
|
private:
|
|
//===---------------------------------------------------------------------
|
|
// Implementation of CallGraph construction
|
|
//
|
|
|
|
// addToCallGraph - Add a function to the call graph, and link the node to all
|
|
// of the functions that it calls.
|
|
//
|
|
void addToCallGraph(Function *F) {
|
|
CallGraphNode *Node = getOrInsertFunction(F);
|
|
|
|
// If this function has external linkage, anything could call it.
|
|
if (!F->hasLocalLinkage()) {
|
|
ExternalCallingNode->addCalledFunction(CallSite(), Node);
|
|
|
|
// Found the entry point?
|
|
if (F->getName() == "main") {
|
|
if (Root) // Found multiple external mains? Don't pick one.
|
|
Root = ExternalCallingNode;
|
|
else
|
|
Root = Node; // Found a main, keep track of it!
|
|
}
|
|
}
|
|
|
|
// Loop over all of the users of the function, looking for non-call uses.
|
|
for (Value::use_iterator I = F->use_begin(), E = F->use_end(); I != E; ++I){
|
|
User *U = *I;
|
|
if ((!isa<CallInst>(U) && !isa<InvokeInst>(U))
|
|
|| !CallSite(cast<Instruction>(U)).isCallee(I)) {
|
|
// Not a call, or being used as a parameter rather than as the callee.
|
|
ExternalCallingNode->addCalledFunction(CallSite(), Node);
|
|
break;
|
|
}
|
|
}
|
|
|
|
// If this function is not defined in this translation unit, it could call
|
|
// anything.
|
|
if (F->isDeclaration() && !F->isIntrinsic())
|
|
Node->addCalledFunction(CallSite(), CallsExternalNode);
|
|
|
|
// 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(cast<Value>(II));
|
|
if (CS && !isa<DbgInfoIntrinsic>(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.
|
|
if (CallsExternalNode) {
|
|
CallsExternalNode->allReferencesDropped();
|
|
delete CallsExternalNode;
|
|
CallsExternalNode = 0;
|
|
}
|
|
CallGraph::destroy();
|
|
}
|
|
};
|
|
|
|
} //End anonymous namespace
|
|
|
|
INITIALIZE_ANALYSIS_GROUP(CallGraph, "Call Graph")
|
|
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()) 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(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(dbgs(), 0);
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Implementations of public modification methods
|
|
//
|
|
|
|
// 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.
|
|
//
|
|
Function *CallGraph::removeFunctionFromModule(CallGraphNode *CGN) {
|
|
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
|
|
FunctionMap.erase(F); // Remove the call graph node from the map
|
|
|
|
Mod->getFunctionList().remove(F);
|
|
return F;
|
|
}
|
|
|
|
// 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 *CallGraph::getOrInsertFunction(const Function *F) {
|
|
CallGraphNode *&CGN = FunctionMap[F];
|
|
if (CGN) return CGN;
|
|
|
|
assert((!F || F->getParent() == Mod) && "Function not in current module!");
|
|
return CGN = new CallGraphNode(const_cast<Function*>(F));
|
|
}
|
|
|
|
void CallGraphNode::print(raw_ostream &OS) const {
|
|
if (Function *F = getFunction())
|
|
OS << "Call graph node for function: '" << F->getName() << "'";
|
|
else
|
|
OS << "Call graph node <<null function>>";
|
|
|
|
OS << "<<" << this << ">> #uses=" << getNumReferences() << '\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(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;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
// 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].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)
|