================
@@ -4912,3 +4922,279 @@ void AutoType::Profile(llvm::FoldingSetNodeID &ID, 
const ASTContext &Context) {
   Profile(ID, Context, getDeducedType(), getKeyword(), isDependentType(),
           getTypeConstraintConcept(), getTypeConstraintArguments());
 }
+
+FunctionEffect::~FunctionEffect() = default;
+
+bool FunctionEffect::diagnoseConversion(bool Adding, QualType OldType,
+                                        FunctionEffectSet OldFX,
+                                        QualType NewType,
+                                        FunctionEffectSet NewFX) const {
+  return false;
+}
+
+bool FunctionEffect::diagnoseRedeclaration(bool Adding,
+                                           const FunctionDecl &OldFunction,
+                                           FunctionEffectSet OldFX,
+                                           const FunctionDecl &NewFunction,
+                                           FunctionEffectSet NewFX) const {
+  return false;
+}
+
+bool FunctionEffect::diagnoseMethodOverride(bool Adding,
+                                            const CXXMethodDecl &OldMethod,
+                                            FunctionEffectSet OldFX,
+                                            const CXXMethodDecl &NewMethod,
+                                            FunctionEffectSet NewFX) const {
+  return false;
+}
+
+bool FunctionEffect::canInferOnDecl(const Decl *Caller,
+                                    FunctionEffectSet CallerFX) const {
+  return false;
+}
+
+bool FunctionEffect::diagnoseFunctionCall(bool Direct, const Decl *Caller,
+                                          FunctionEffectSet CallerFX,
+                                          CalleeDeclOrType Callee,
+                                          FunctionEffectSet CalleeFX) const {
+  return false;
+}
+
+const NoLockNoAllocEffect &NoLockNoAllocEffect::nolock_instance() {
+  static NoLockNoAllocEffect global(kNoLockTrue, "nolock");
+  return global;
+}
----------------
Sirraide wrote:

> detect that a function is declared nolock(false) or noalloc(false) (by 
> examining the function's type sugar) and short-circuit any attempt to infer 
> the attribute.

Well, is that only *functions* or *function types* as well, though? Because 
functions would still have the `nolock` *attribute*, which then would store 
that data and could be used for inference. If it’s function types as well, then 
one option would be to store two bits instead of one, but I agree that that 
sounds a bit messy and we might want to think a bit more about it in that case. 
(I’d also have to double-check how/where attributes are stored on types)

https://github.com/llvm/llvm-project/pull/84983
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