add v8::PropertyCallbackInfo (#68)

src/binding.cc

@@ -21,6 +21,9 @@ static_assert(sizeof(v8::PromiseRejectMessage) == sizeof(size_t) * 3,
 
 static_assert(sizeof(v8::Locker) == sizeof(size_t) * 2, "Locker size mismatch");
 
+static_assert(sizeof(v8::ReturnValue<v8::Value>) == sizeof(size_t) * 1,
+              "ReturnValue size mismatch");
+
 extern "C" {
 
 void v8__V8__SetFlagsFromCommandLine(int* argc, char** argv) {
@@ -272,11 +275,10 @@ v8::Isolate* v8__FunctionCallbackInfo__GetIsolate(
   return self->GetIsolate();
 }
 
-v8::ReturnValue<v8::Value>* v8__FunctionCallbackInfo__GetReturnValue(
-    v8::FunctionCallbackInfo<v8::Value>* self) {
-  v8::ReturnValue<v8::Value>* rv =
-      new v8::ReturnValue<v8::Value>(self->GetReturnValue());
-  return rv;
+void v8__FunctionCallbackInfo__GetReturnValue(
+    v8::FunctionCallbackInfo<v8::Value>* self,
+    v8::ReturnValue<v8::Value>* out) {
+  *out = self->GetReturnValue();
 }
 
 void v8__ReturnValue__Set(v8::ReturnValue<v8::Value>* self,
@@ -395,6 +397,22 @@ v8::Value* v8__PromiseRejectMessage__GetValue(
   return local_to_ptr(self.GetValue());
 }
 
+v8::Isolate* v8__PropertyCallbackInfo__GetIsolate(
+    const v8::PropertyCallbackInfo<v8::Value>* self) {
+  return self->GetIsolate();
+}
+
+v8::Object* v8__PropertyCallbackInfo__This(
+    const v8::PropertyCallbackInfo<v8::Value>* self) {
+  return local_to_ptr(self->This());
+}
+
+void v8__PropertyCallbackInfo__GetReturnValue(
+    const v8::PropertyCallbackInfo<v8::Value>* self,
+    v8::ReturnValue<v8::Value>* out) {
+  *out = self->GetReturnValue();
+}
+
 v8::Platform* v8__platform__NewDefaultPlatform() {
   // TODO: support optional arguments.
   return v8::platform::NewDefaultPlatform().release();

src/function.rs

@@ -3,6 +3,7 @@ use crate::Context;
 use crate::Isolate;
 use crate::Local;
 use crate::Value;
+use std::mem::MaybeUninit;
 
 extern "C" {
   fn v8__Function__New(
@@ -32,7 +33,8 @@ extern "C" {
   fn v8__FunctionCallbackInfo__Length(info: &FunctionCallbackInfo) -> int;
   fn v8__FunctionCallbackInfo__GetReturnValue(
     info: &FunctionCallbackInfo,
-  ) -> *mut ReturnValue;
+    out: *mut ReturnValue,
+  );
 
   fn v8__ReturnValue__Set(rv: *mut ReturnValue, value: *mut Value) -> ();
   fn v8__ReturnValue__Get(rv: *mut ReturnValue) -> *mut Value;
@@ -40,7 +42,7 @@ extern "C" {
 }
 
 #[repr(C)]
-pub struct ReturnValue(Opaque);
+pub struct ReturnValue([usize; 1]);
 
 /// In V8 ReturnValue<> has a type parameter, but
 /// it turns out that in most of the APIs it's ReturnValue<Value>
@@ -76,8 +78,12 @@ pub struct FunctionCallbackInfo(Opaque);
 impl FunctionCallbackInfo {
   /// The ReturnValue for the call.
   #[allow(clippy::mut_from_ref)]
-  pub fn get_return_value(&self) -> &mut ReturnValue {
-    unsafe { &mut *v8__FunctionCallbackInfo__GetReturnValue(&*self) }
+  pub fn get_return_value(&self) -> ReturnValue {
+    let mut rv = MaybeUninit::<ReturnValue>::uninit();
+    unsafe {
+      v8__FunctionCallbackInfo__GetReturnValue(&*self, rv.as_mut_ptr());
+      rv.assume_init()
+    }
   }
 
   /// The current Isolate.

src/lib.rs

@@ -21,6 +21,7 @@ mod number;
 mod object;
 mod primitives;
 mod promise;
+mod property;
 mod script;
 mod string;
 mod support;
@@ -37,7 +38,9 @@ pub mod V8;
 
 pub use context::Context;
 pub use exception::*;
-pub use function::{Function, FunctionCallbackInfo, FunctionTemplate};
+pub use function::{
+  Function, FunctionCallbackInfo, FunctionTemplate, ReturnValue,
+};
 pub use handle_scope::HandleScope;
 pub use isolate::Isolate;
 pub use isolate::OwnedIsolate;
@@ -51,6 +54,7 @@ pub use promise::{
   Promise, PromiseRejectEvent, PromiseRejectMessage, PromiseResolver,
   PromiseState,
 };
+pub use property::PropertyCallbackInfo;
 pub use script::{Script, ScriptOrigin};
 pub use string::NewStringType;
 pub use string::String;

src/property.rs

@@ -0,0 +1,39 @@
+use crate::isolate::Isolate;
+use crate::support::Opaque;
+use crate::Local;
+use crate::Object;
+use crate::ReturnValue;
+use std::mem::MaybeUninit;
+
+extern "C" {
+  fn v8__PropertyCallbackInfo__GetIsolate(
+    info: &PropertyCallbackInfo,
+  ) -> &mut Isolate;
+  fn v8__PropertyCallbackInfo__This(info: &PropertyCallbackInfo)
+    -> *mut Object;
+  fn v8__PropertyCallbackInfo__GetReturnValue(
+    info: &PropertyCallbackInfo,
+    out: *mut ReturnValue,
+  );
+}
+
+#[repr(C)]
+pub struct PropertyCallbackInfo(Opaque);
+
+impl PropertyCallbackInfo {
+  pub fn get_return_value(&self) -> ReturnValue {
+    let mut rv = MaybeUninit::<ReturnValue>::uninit();
+    unsafe {
+      v8__PropertyCallbackInfo__GetReturnValue(self, rv.as_mut_ptr());
+      rv.assume_init()
+    }
+  }
+
+  pub fn get_isolate(&self) -> &Isolate {
+    unsafe { v8__PropertyCallbackInfo__GetIsolate(self) }
+  }
+
+  pub fn this(&self) -> Local<Object> {
+    unsafe { Local::from_raw(v8__PropertyCallbackInfo__This(self)).unwrap() }
+  }
+}

tests/test_api.rs

@@ -483,7 +483,7 @@ extern "C" fn fn_callback(info: &FunctionCallbackInfo) {
     context.enter();
     let s = v8_str(&isolate, "Hello callback!");
     let value: Local<v8::Value> = s.into();
-    let rv = info.get_return_value();
+    let rv = &mut info.get_return_value();
     let rv_value = rv.get();
     assert!(rv_value.is_undefined());
     rv.set(value);