diff options
Diffstat (limited to 'lib/VMCore/Function.cpp')
| -rw-r--r-- | lib/VMCore/Function.cpp | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/lib/VMCore/Function.cpp b/lib/VMCore/Function.cpp index be0f056..bb8f62a 100644 --- a/lib/VMCore/Function.cpp +++ b/lib/VMCore/Function.cpp @@ -402,6 +402,7 @@ Function *Intrinsic::getDeclaration(Module *M, ID id, ArrayRef<Type*> Tys) { bool Function::hasAddressTaken(const User* *PutOffender) const { for (Value::const_use_iterator I = use_begin(), E = use_end(); I != E; ++I) { const User *U = *I; + // FIXME: Check for blockaddress, which does not take the address. if (!isa<CallInst>(U) && !isa<InvokeInst>(U)) return PutOffender ? (*PutOffender = U, true) : true; ImmutableCallSite CS(cast<Instruction>(U)); @@ -411,6 +412,20 @@ bool Function::hasAddressTaken(const User* *PutOffender) const { return false; } +bool Function::isDefTriviallyDead() const { + // Check the linkage + if (!hasLinkOnceLinkage() && !hasLocalLinkage() && + !hasAvailableExternallyLinkage()) + return false; + + // Check if the function is used by anything other than a blockaddress. + for (Value::const_use_iterator I = use_begin(), E = use_end(); I != E; ++I) + if (!isa<BlockAddress>(*I)) + return false; + + return true; +} + /// callsFunctionThatReturnsTwice - Return true if the function has a call to /// setjmp or other function that gcc recognizes as "returning twice". bool Function::callsFunctionThatReturnsTwice() const { |