src: simplify SlicedArguments

Re-use the existing `MaybeStackBuffer` logic for `SlicedArguments`.

PR-URL: #25745
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

Author: addaleax

src/inspector_js_api.cc

@@ -139,7 +139,7 @@ void CallAndPauseOnStart(const FunctionCallbackInfo<v8::Value>& args) {
   env->inspector_agent()->PauseOnNextJavascriptStatement("Break on start");
   v8::MaybeLocal<v8::Value> retval =
       args[0].As<v8::Function>()->Call(env->context(), args[1],
-                                       call_args.size(), call_args.data());
+                                       call_args.length(), call_args.out());
   if (!retval.IsEmpty()) {
     args.GetReturnValue().Set(retval.ToLocalChecked());
   }
@@ -164,8 +164,8 @@ void InspectorConsoleCall(const FunctionCallbackInfo<Value>& info) {
                                v8::True(isolate)).FromJust());
       CHECK(!inspector_method.As<Function>()->Call(context,
                                                    info.Holder(),
-                                                   call_args.size(),
-                                                   call_args.data()).IsEmpty());
+                                                   call_args.length(),
+                                                   call_args.out()).IsEmpty());
     }
     CHECK(config_object->Delete(context, in_call_key).FromJust());
   }
@@ -174,8 +174,8 @@ void InspectorConsoleCall(const FunctionCallbackInfo<Value>& info) {
   CHECK(node_method->IsFunction());
   node_method.As<Function>()->Call(context,
                                    info.Holder(),
-                                   call_args.size(),
-                                   call_args.data()).FromMaybe(Local<Value>());
+                                   call_args.length(),
+                                   call_args.out()).FromMaybe(Local<Value>());
 }
 
 static void* GetAsyncTask(int64_t asyncId) {

src/node_perf.cc

@@ -344,10 +344,10 @@ void TimerFunctionCall(const FunctionCallbackInfo<Value>& args) {
   v8::MaybeLocal<Value> ret;
 
   if (is_construct_call) {
-    ret = fn->NewInstance(context, call_args.size(), call_args.data())
+    ret = fn->NewInstance(context, call_args.length(), call_args.out())
         .FromMaybe(Local<Object>());
   } else {
-    ret = fn->Call(context, args.This(), call_args.size(), call_args.data());
+    ret = fn->Call(context, args.This(), call_args.length(), call_args.out());
   }
 
   uint64_t end = PERFORMANCE_NOW();

src/util-inl.h

@@ -455,6 +455,17 @@ v8::MaybeLocal<v8::Value> ToV8Value(v8::Local<v8::Context> context,
   return v8::Number::New(isolate, static_cast<double>(number));
 }
 
+SlicedArguments::SlicedArguments(
+    const v8::FunctionCallbackInfo<v8::Value>& args, size_t start) {
+  const size_t length = static_cast<size_t>(args.Length());
+  if (start >= length) return;
+  const size_t size = length - start;
+
+  AllocateSufficientStorage(size);
+  for (size_t i = 0; i < size; ++i)
+    (*this)[i] = args[i + start];
+}
+
 }  // namespace node
 
 #endif  // defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS

src/util.h

@@ -629,37 +629,12 @@ constexpr T RoundUp(T a, T b) {
 #define MUST_USE_RESULT
 #endif
 
-class SlicedArguments {
+class SlicedArguments : public MaybeStackBuffer<v8::Local<v8::Value>> {
  public:
   inline explicit SlicedArguments(
       const v8::FunctionCallbackInfo<v8::Value>& args, size_t start = 0);
-  inline size_t size() const { return size_; }
-  inline v8::Local<v8::Value>* data() { return data_; }
-
- private:
-  size_t size_;
-  v8::Local<v8::Value>* data_;
-  v8::Local<v8::Value> fixed_[64];
-  std::vector<v8::Local<v8::Value>> dynamic_;
 };
 
-SlicedArguments::SlicedArguments(
-    const v8::FunctionCallbackInfo<v8::Value>& args, size_t start)
-    : size_(0), data_(fixed_) {
-  const size_t length = static_cast<size_t>(args.Length());
-  if (start >= length) return;
-  const size_t size = length - start;
-
-  if (size > arraysize(fixed_)) {
-    dynamic_.resize(size);
-    data_ = dynamic_.data();
-  }
-
-  for (size_t i = 0; i < size; ++i) data_[i] = args[i + start];
-
-  size_ = size;
-}
-
 }  // namespace node
 
 #endif  // defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS