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Implement and use new method Function::hasAddressTaken().
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73164 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -395,6 +395,10 @@ public:
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/// including any contained basic blocks.
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///
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void dropAllReferences();
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/// hasAddressTaken - returns true if there are any uses of this function
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/// other than direct calls or invokes to it.
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bool hasAddressTaken() const;
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};
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inline ValueSymbolTable *
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@ -127,18 +127,9 @@ bool ArgPromotion::PromoteArguments(CallGraphNode *CGN) {
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// Second check: make sure that all callers are direct callers. We can't
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// transform functions that have indirect callers.
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for (Value::use_iterator UI = F->use_begin(), E = F->use_end();
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UI != E; ++UI) {
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CallSite CS = CallSite::get(*UI);
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if (!CS.getInstruction()) // "Taking the address" of the function
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if (F->hasAddressTaken())
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return false;
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// Ensure that this call site is CALLING the function, not passing it as
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// an argument.
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if (!CS.isCallee(UI))
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return false;
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}
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// Check to see which arguments are promotable. If an argument is promotable,
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// add it to ArgsToPromote.
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SmallPtrSet<Argument*, 8> ArgsToPromote;
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@ -175,15 +175,8 @@ bool DAE::DeleteDeadVarargs(Function &Fn) {
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if (Fn.isDeclaration() || !Fn.hasLocalLinkage()) return false;
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// Ensure that the function is only directly called.
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for (Value::use_iterator I = Fn.use_begin(), E = Fn.use_end(); I != E; ++I) {
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// If this use is anything other than a call site, give up.
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CallSite CS = CallSite::get(*I);
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Instruction *TheCall = CS.getInstruction();
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if (!TheCall) return false; // Not a direct call site?
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// The addr of this function is passed to the call.
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if (!CS.isCallee(I)) return false;
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}
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if (Fn.hasAddressTaken())
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return false;
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// Okay, we know we can transform this function if safe. Scan its body
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// looking for calls to llvm.vastart.
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@ -1769,22 +1769,6 @@ bool GlobalOpt::ProcessInternalGlobal(GlobalVariable *GV,
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return false;
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}
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/// OnlyCalledDirectly - Return true if the specified function is only called
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/// directly. In other words, its address is never taken.
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static bool OnlyCalledDirectly(Function *F) {
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for (Value::use_iterator UI = F->use_begin(), E = F->use_end(); UI != E;++UI){
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Instruction *User = dyn_cast<Instruction>(*UI);
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if (!User) return false;
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if (!isa<CallInst>(User) && !isa<InvokeInst>(User)) return false;
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// See if the function address is passed as an argument.
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for (User::op_iterator i = User->op_begin() + 1, e = User->op_end();
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i != e; ++i)
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if (*i == F) return false;
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}
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return true;
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}
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/// ChangeCalleesToFastCall - Walk all of the direct calls of the specified
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/// function, changing them to FastCC.
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static void ChangeCalleesToFastCall(Function *F) {
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@ -1830,7 +1814,7 @@ bool GlobalOpt::OptimizeFunctions(Module &M) {
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++NumFnDeleted;
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} else if (F->hasLocalLinkage()) {
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if (F->getCallingConv() == CallingConv::C && !F->isVarArg() &&
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OnlyCalledDirectly(F)) {
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!F->hasAddressTaken()) {
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// If this function has C calling conventions, is not a varargs
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// function, and is only called directly, promote it to use the Fast
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// calling convention.
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@ -1841,7 +1825,7 @@ bool GlobalOpt::OptimizeFunctions(Module &M) {
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}
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if (F->getAttributes().hasAttrSomewhere(Attribute::Nest) &&
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OnlyCalledDirectly(F)) {
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!F->hasAddressTaken()) {
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// The function is not used by a trampoline intrinsic, so it is safe
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// to remove the 'nest' attribute.
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RemoveNestAttribute(F);
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@ -364,4 +364,15 @@ Function *Intrinsic::getDeclaration(Module *M, ID id, const Type **Tys,
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#include "llvm/Intrinsics.gen"
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#undef GET_LLVM_INTRINSIC_FOR_GCC_BUILTIN
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/// hasAddressTaken - returns true if there are any uses of this function
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/// other than direct calls or invokes to it.
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bool Function::hasAddressTaken() const {
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for (Value::use_const_iterator I = use_begin(), E = use_end(); I != E; ++I) {
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if (I.getOperandNo() != 0 ||
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(!isa<CallInst>(*I) && !isa<InvokeInst>(*I)))
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return true;
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}
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return false;
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}
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// vim: sw=2 ai
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