+/// Returns true if this function should be rewritten to include safepoint
+/// polls and parseable call sites. The main point of this function is to be
+/// an extension point for custom logic.
+static bool shouldRewriteFunction(Function &F) {
+ // TODO: This should check the GCStrategy
+ if (F.hasGC()) {
+ const std::string StatepointExampleName("statepoint-example");
+ return StatepointExampleName == F.getGC();
+ } else
+ return false;
+}
+
+// TODO: These should become properties of the GCStrategy, possibly with
+// command line overrides.
+static bool enableEntrySafepoints(Function &F) { return !NoEntry; }
+static bool enableBackedgeSafepoints(Function &F) { return !NoBackedge; }
+static bool enableCallSafepoints(Function &F) { return !NoCall; }
+
+// Normalize basic block to make it ready to be target of invoke statepoint.
+// Ensure that 'BB' does not have phi nodes. It may require spliting it.
+static BasicBlock *normalizeForInvokeSafepoint(BasicBlock *BB,
+ BasicBlock *InvokeParent) {
+ BasicBlock *ret = BB;
+
+ if (!BB->getUniquePredecessor()) {
+ ret = SplitBlockPredecessors(BB, InvokeParent, "");
+ }
+
+ // Now that 'ret' has unique predecessor we can safely remove all phi nodes
+ // from it
+ FoldSingleEntryPHINodes(ret);
+ assert(!isa<PHINode>(ret->begin()));
+
+ return ret;
+}
+