///
bool hasAddressTaken(const User** = 0) const;
- /// callsFunctionThatReturnsTwice - Return true if the function has a call to
- /// setjmp or other function that gcc recognizes as "returning twice".
- bool callsFunctionThatReturnsTwice() const;
-
private:
// Shadow Value::setValueSubclassData with a private forwarding method so that
// subclasses cannot accidentally use it.
/// analyzeFunction - Fill in the current structure with information gleaned
/// from the specified function.
void CodeMetrics::analyzeFunction(Function *F, const TargetData *TD) {
- // If this function contains a call to setjmp or _setjmp, never inline
- // it. This is a hack because we depend on the user marking their local
- // variables as volatile if they are live across a setjmp call, and they
- // probably won't do this in callers.
- if (F->callsFunctionThatReturnsTwice())
- callsSetJmp = true;
+ // If this function contains a call that "returns twice" (e.g., setjmp or
+ // _setjmp), never inline it. This is a hack because we depend on the user
+ // marking their local variables as volatile if they are live across a setjmp
+ // call, and they probably won't do this in callers.
+ callsSetJmp = F->hasFnAttr(Attribute::ReturnsTwice);
// Look at the size of the callee.
for (Function::const_iterator BB = F->begin(), E = F->end(); BB != E; ++BB)
}
// Determine if there is a call to setjmp in the machine function.
- MF->setCallsSetJmp(Fn.callsFunctionThatReturnsTwice());
+ MF->setCallsSetJmp(Fn.hasFnAttr(Attribute::ReturnsTwice));
// Replace forward-declared registers with the registers containing
// the desired value.
// Finally, if this function contains no non-escaping allocas, or calls
// setjmp, mark all calls in the function as eligible for tail calls
//(there is no stack memory for them to access).
- if (!FunctionContainsEscapingAllocas && !F.callsFunctionThatReturnsTwice())
+ if (!FunctionContainsEscapingAllocas && !F.hasFnAttr(Attribute::ReturnsTwice))
for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ++I)
if (CallInst *CI = dyn_cast<CallInst>(I)) {
return false;
}
-/// callsFunctionThatReturnsTwice - Return true if the function has a call to
-/// setjmp or other function that gcc recognizes as "returning twice".
-///
-/// FIXME: Remove after <rdar://problem/8031714> is fixed.
-/// FIXME: Is the above FIXME valid?
-bool Function::callsFunctionThatReturnsTwice() const {
- static const char *const ReturnsTwiceFns[] = {
- "_setjmp",
- "setjmp",
- "sigsetjmp",
- "setjmp_syscall",
- "savectx",
- "qsetjmp",
- "vfork",
- "getcontext"
- };
-
- for (const_inst_iterator I = inst_begin(this), E = inst_end(this); I != E;
- ++I) {
- const CallInst* callInst = dyn_cast<CallInst>(&*I);
- if (!callInst)
- continue;
- if (callInst->canReturnTwice())
- return true;
-
- // check for known function names.
- // FIXME: move this to clang.
- Function *F = callInst->getCalledFunction();
- if (!F)
- continue;
- StringRef Name = F->getName();
- for (unsigned J = 0, e = array_lengthof(ReturnsTwiceFns); J != e; ++J) {
- if (Name == ReturnsTwiceFns[J])
- return true;
- }
- }
-
- return false;
-}
-
// vim: sw=2 ai