[llvm] [llvm][ARM][AArch64] Add attributes to synthetic functions. (PR #83153)

[via llvm-commits]

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@@ -378,6 +380,40 @@ Function *Function::createWithDefaultAttr(FunctionType *Ty,
   }
   if (M->getModuleFlag("function_return_thunk_extern"))
     B.addAttribute(Attribute::FnRetThunkExtern);
+
+  Triple T(M->getTargetTriple());
+
+  auto Profile = llvm::ARM::parseArchProfile(T.getArchName());
+  if ((T.isArmT32() && Profile == llvm::ARM::ProfileKind::M) || T.isAArch64()) {
+    // Check if the module attribute is present and not zero.
+    auto isModuleAttributeSet = [&](const StringRef &ModAttr) -> bool {
+      const auto *Attr =
+          mdconst::extract_or_null<ConstantInt>(M->getModuleFlag(ModAttr));
+      return Attr && Attr->getZExtValue();
+    };
+
+    auto AddAttributeIfSet = [&](const StringRef &ModAttr) {
+      if (isModuleAttributeSet(ModAttr))
+        B.addAttribute(ModAttr, "true");
+    };
+
+    StringRef SignType = "none";
+    if (isModuleAttributeSet("sign-return-address"))
+      SignType = "non-leaf";
+    if (isModuleAttributeSet("sign-return-address-all"))
+      SignType = "all";
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DanielKristofKiss wrote:

#83635 is about the verification.

https://github.com/llvm/llvm-project/pull/83153