================
@@ -3361,6 +3382,194 @@ void PPCAIXAsmPrinter::emitModuleCommandLines(Module
&M) {
OutStreamer->emitXCOFFCInfoSym(".GCC.command.line", RSOS.str());
}
+static bool TOCRestoreNeeded(const GlobalIFunc &GI) {
+ auto IsLocalFunc = [&](const Value *V) {
+ if (!isa<Function>(V))
+ return false;
+ auto *F = cast<Function>(V);
+
+ // static functions are local
+ if (F->getLinkage() == GlobalValue::InternalLinkage)
+ return true;
+ // for now, declarations we treat as potentially non-local
+ if (F->isDeclarationForLinker())
+ return false;
+ // hidden visibility definitions cannot be preempted, so treat as local.
+ if (F->getVisibility() == GlobalValue::HiddenVisibility)
+ return true;
+
+ return false;
+ };
+
+ if (!IFuncLocal.empty()) {
+ ArrayRef<std::string> List = IFuncLocal;
+ // special case of -ifunc-local=1
+ if (List.size() == 1 && List[0].compare("1") == 0)
+ return false;
+ StringRef IFuncName = GI.getName();
+ if (any_of(List, [&](const std::string &Element) {
+ return Element.size() == IFuncName.size() &&
+ Element.compare(IFuncName.data()) == 0;
+ }))
+ return false;
+ }
+
+ // if one of the return values of the resolver function is not a
+ // local function, then we have to conservatively do a TOC save/restore.
+ auto *Resolver = GI.getResolverFunction();
----------------
w2yehia wrote:
the resolver can be preempted so only walk the body if it's not preemtible.
double check that it's valid to have a preemptible resolver.
https://github.com/llvm/llvm-project/pull/153049
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