namespace {
struct FunctionAttrs : public CallGraphSCCPass {
static char ID; // Pass identification, replacement for typeid
- FunctionAttrs() : CallGraphSCCPass(&ID) {}
+ FunctionAttrs() : CallGraphSCCPass(ID) {
+ initializeFunctionAttrsPass(*PassRegistry::getPassRegistry());
+ }
// runOnSCC - Analyze the SCC, performing the transformation if possible.
- bool runOnSCC(std::vector<CallGraphNode *> &SCC);
+ bool runOnSCC(CallGraphSCC &SCC);
// AddReadAttrs - Deduce readonly/readnone attributes for the SCC.
- bool AddReadAttrs(const std::vector<CallGraphNode *> &SCC);
+ bool AddReadAttrs(const CallGraphSCC &SCC);
// AddNoCaptureAttrs - Deduce nocapture attributes for the SCC.
- bool AddNoCaptureAttrs(const std::vector<CallGraphNode *> &SCC);
+ bool AddNoCaptureAttrs(const CallGraphSCC &SCC);
// IsFunctionMallocLike - Does this function allocate new memory?
bool IsFunctionMallocLike(Function *F,
SmallPtrSet<Function*, 8> &) const;
// AddNoAliasAttrs - Deduce noalias attributes for the SCC.
- bool AddNoAliasAttrs(const std::vector<CallGraphNode *> &SCC);
+ bool AddNoAliasAttrs(const CallGraphSCC &SCC);
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
AU.setPreservesCFG();
}
char FunctionAttrs::ID = 0;
-static RegisterPass<FunctionAttrs>
-X("functionattrs", "Deduce function attributes");
+INITIALIZE_PASS_BEGIN(FunctionAttrs, "functionattrs",
+ "Deduce function attributes", false, false)
+INITIALIZE_AG_DEPENDENCY(CallGraph)
+INITIALIZE_PASS_END(FunctionAttrs, "functionattrs",
+ "Deduce function attributes", false, false)
Pass *llvm::createFunctionAttrsPass() { return new FunctionAttrs(); }
/// memory that is local to the function. Global constants are considered
/// local to all functions.
bool FunctionAttrs::PointsToLocalMemory(Value *V) {
- SmallVector<Value*, 8> Worklist;
- unsigned MaxLookup = 4;
+ SmallVector<Value*, 16> Worklist;
+ unsigned MaxLookup = 8;
Worklist.push_back(V);
}
/// AddReadAttrs - Deduce readonly/readnone attributes for the SCC.
-bool FunctionAttrs::AddReadAttrs(const std::vector<CallGraphNode *> &SCC) {
+bool FunctionAttrs::AddReadAttrs(const CallGraphSCC &SCC) {
SmallPtrSet<Function*, 8> SCCNodes;
// Fill SCCNodes with the elements of the SCC. Used for quickly
// looking up whether a given CallGraphNode is in this SCC.
- for (unsigned i = 0, e = SCC.size(); i != e; ++i)
- SCCNodes.insert(SCC[i]->getFunction());
+ for (CallGraphSCC::iterator I = SCC.begin(), E = SCC.end(); I != E; ++I)
+ SCCNodes.insert((*I)->getFunction());
// Check if any of the functions in the SCC read or write memory. If they
// write memory then they can't be marked readnone or readonly.
bool ReadsMemory = false;
- for (unsigned i = 0, e = SCC.size(); i != e; ++i) {
- Function *F = SCC[i]->getFunction();
+ for (CallGraphSCC::iterator I = SCC.begin(), E = SCC.end(); I != E; ++I) {
+ Function *F = (*I)->getFunction();
if (F == 0)
// External node - may write memory. Just give up.
// Some instructions can be ignored even if they read or write memory.
// Detect these now, skipping to the next instruction if one is found.
- CallSite CS = CallSite::get(I);
- if (CS.getInstruction() && CS.getCalledFunction()) {
+ CallSite CS(cast<Value>(I));
+ if (CS && CS.getCalledFunction()) {
// Ignore calls to functions in the same SCC.
if (SCCNodes.count(CS.getCalledFunction()))
continue;
// Ignore intrinsics that only access local memory.
if (unsigned id = CS.getCalledFunction()->getIntrinsicID())
- if (AliasAnalysis::getModRefBehavior(id) ==
+ if (AliasAnalysis::getIntrinsicModRefBehavior(id) ==
AliasAnalysis::AccessesArguments) {
// Check that all pointer arguments point to local memory.
for (CallSite::arg_iterator CI = CS.arg_begin(), CE = CS.arg_end();
CI != CE; ++CI) {
Value *Arg = *CI;
- if (isa<PointerType>(Arg->getType()) && !PointsToLocalMemory(Arg))
+ if (Arg->getType()->isPointerTy() && !PointsToLocalMemory(Arg))
// Writes memory. Just give up.
return false;
}
// Success! Functions in this SCC do not access memory, or only read memory.
// Give them the appropriate attribute.
bool MadeChange = false;
- for (unsigned i = 0, e = SCC.size(); i != e; ++i) {
- Function *F = SCC[i]->getFunction();
+ for (CallGraphSCC::iterator I = SCC.begin(), E = SCC.end(); I != E; ++I) {
+ Function *F = (*I)->getFunction();
if (F->doesNotAccessMemory())
// Already perfect!
}
/// AddNoCaptureAttrs - Deduce nocapture attributes for the SCC.
-bool FunctionAttrs::AddNoCaptureAttrs(const std::vector<CallGraphNode *> &SCC) {
+bool FunctionAttrs::AddNoCaptureAttrs(const CallGraphSCC &SCC) {
bool Changed = false;
// Check each function in turn, determining which pointer arguments are not
// captured.
- for (unsigned i = 0, e = SCC.size(); i != e; ++i) {
- Function *F = SCC[i]->getFunction();
+ for (CallGraphSCC::iterator I = SCC.begin(), E = SCC.end(); I != E; ++I) {
+ Function *F = (*I)->getFunction();
if (F == 0)
// External node - skip it;
continue;
for (Function::arg_iterator A = F->arg_begin(), E = F->arg_end(); A!=E; ++A)
- if (isa<PointerType>(A->getType()) && !A->hasNoCaptureAttr() &&
+ if (A->getType()->isPointerTy() && !A->hasNoCaptureAttr() &&
!PointerMayBeCaptured(A, true, /*StoreCaptures=*/false)) {
A->addAttr(Attribute::NoCapture);
++NumNoCapture;
}
/// AddNoAliasAttrs - Deduce noalias attributes for the SCC.
-bool FunctionAttrs::AddNoAliasAttrs(const std::vector<CallGraphNode *> &SCC) {
+bool FunctionAttrs::AddNoAliasAttrs(const CallGraphSCC &SCC) {
SmallPtrSet<Function*, 8> SCCNodes;
// Fill SCCNodes with the elements of the SCC. Used for quickly
// looking up whether a given CallGraphNode is in this SCC.
- for (unsigned i = 0, e = SCC.size(); i != e; ++i)
- SCCNodes.insert(SCC[i]->getFunction());
+ for (CallGraphSCC::iterator I = SCC.begin(), E = SCC.end(); I != E; ++I)
+ SCCNodes.insert((*I)->getFunction());
// Check each function in turn, determining which functions return noalias
// pointers.
- for (unsigned i = 0, e = SCC.size(); i != e; ++i) {
- Function *F = SCC[i]->getFunction();
+ for (CallGraphSCC::iterator I = SCC.begin(), E = SCC.end(); I != E; ++I) {
+ Function *F = (*I)->getFunction();
if (F == 0)
// External node - skip it;
// We annotate noalias return values, which are only applicable to
// pointer types.
- if (!isa<PointerType>(F->getReturnType()))
+ if (!F->getReturnType()->isPointerTy())
continue;
if (!IsFunctionMallocLike(F, SCCNodes))
}
bool MadeChange = false;
- for (unsigned i = 0, e = SCC.size(); i != e; ++i) {
- Function *F = SCC[i]->getFunction();
- if (F->doesNotAlias(0) || !isa<PointerType>(F->getReturnType()))
+ for (CallGraphSCC::iterator I = SCC.begin(), E = SCC.end(); I != E; ++I) {
+ Function *F = (*I)->getFunction();
+ if (F->doesNotAlias(0) || !F->getReturnType()->isPointerTy())
continue;
F->setDoesNotAlias(0);
return MadeChange;
}
-bool FunctionAttrs::runOnSCC(std::vector<CallGraphNode *> &SCC) {
+bool FunctionAttrs::runOnSCC(CallGraphSCC &SCC) {
bool Changed = AddReadAttrs(SCC);
Changed |= AddNoCaptureAttrs(SCC);
Changed |= AddNoAliasAttrs(SCC);
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