Basic support for Local<Number> and Local<Integer> (#23)

BUILD.gn

@@ -13,6 +13,7 @@ v8_static_library("rusty_v8") {
     "src/platform/mod.cc",
     "src/platform/task.cc",
     "src/string_buffer.cc",
+    "src/value.cc",
   ]
   deps = [
     ":v8",

src/handle_scope.cc

@@ -18,4 +18,8 @@ void v8__HandleScope__CONSTRUCT(uninit_t<HandleScope>& buf, Isolate* isolate) {
 void v8__HandleScope__DESTRUCT(HandleScope& self) {
   self.~HandleScope();
 }
+
+Isolate* v8__HandleScope__GetIsolate(const HandleScope& self) {
+  return self.GetIsolate();
+}
 }

src/handle_scope.rs

@@ -1,63 +1,40 @@
-use std::mem::drop;
+use std::marker::PhantomData;
 use std::mem::MaybeUninit;
 
 use crate::isolate::CxxIsolate;
 use crate::isolate::LockedIsolate;
-use crate::support::Scope;
 
 extern "C" {
   fn v8__HandleScope__CONSTRUCT(
-    buf: &mut MaybeUninit<CxxHandleScope>,
+    buf: &mut MaybeUninit<HandleScope>,
     isolate: &mut CxxIsolate,
   );
-  fn v8__HandleScope__DESTRUCT(this: &mut CxxHandleScope);
+  fn v8__HandleScope__DESTRUCT(this: &mut HandleScope);
+  fn v8__HandleScope__GetIsolate<'sc>(
+    this: &'sc HandleScope,
+  ) -> &'sc mut CxxIsolate;
 }
 
 #[repr(C)]
-pub struct CxxHandleScope([usize; 3]);
+pub struct HandleScope<'sc>([usize; 3], PhantomData<&'sc mut ()>);
 
-pub struct HandleScope<'a, P> {
-  parent: &'a mut P,
-  cxx_handle_scope: MaybeUninit<CxxHandleScope>,
-}
-
-impl<'a, 'b, P> LockedIsolate for Scope<'a, HandleScope<'b, P>>
+impl<'sc> HandleScope<'sc> {
+  pub fn enter<P>(parent: &mut P, mut f: impl FnMut(&mut HandleScope<'_>) -> ())
   where
     P: LockedIsolate,
   {
-  fn cxx_isolate(&mut self) -> &mut CxxIsolate {
-    self.0.parent.cxx_isolate()
-  }
-}
-
-impl<'a, P> HandleScope<'a, P>
-where
-  P: LockedIsolate,
-{
-  pub fn new(parent: &'a mut P) -> Self {
-    Self {
-      parent,
-      cxx_handle_scope: MaybeUninit::uninit(),
-    }
-  }
-
-  pub fn enter(&mut self, mut f: impl FnMut(&mut Scope<Self>) -> ()) {
-    unsafe {
-      v8__HandleScope__CONSTRUCT(
-        &mut self.cxx_handle_scope,
-        self.parent.cxx_isolate(),
-      )
-    };
-
-    let mut scope = Scope::new(self);
+    let mut scope: MaybeUninit<Self> = MaybeUninit::uninit();
+    unsafe { v8__HandleScope__CONSTRUCT(&mut scope, parent.cxx_isolate()) };
+    let mut scope = unsafe { &mut *(&mut scope as *mut _ as *mut HandleScope) };
     f(&mut scope);
-    drop(scope);
 
-    unsafe {
-      v8__HandleScope__DESTRUCT(
-        &mut *(&mut self.cxx_handle_scope as *mut _ as *mut CxxHandleScope),
-      )
-    };
+    unsafe { v8__HandleScope__DESTRUCT(&mut scope) };
+  }
+}
+
+impl<'sc> LockedIsolate for HandleScope<'sc> {
+  fn cxx_isolate(&mut self) -> &mut CxxIsolate {
+    unsafe { v8__HandleScope__GetIsolate(self) }
   }
 }
 
@@ -66,17 +43,29 @@ mod tests {
   use super::*;
   use crate::array_buffer::Allocator;
   use crate::isolate::*;
+  use crate::Integer;
   use crate::Locker;
+  use crate::Number;
 
   #[test]
+  #[allow(clippy::float_cmp)]
   fn test_handle_scope() {
     let g = crate::test_util::setup();
     let mut params = CreateParams::new();
     params.set_array_buffer_allocator(Allocator::new_default_allocator());
-    let isolate = Isolate::new(params);
-    let mut locker = Locker::new(&isolate);
-    HandleScope::new(&mut locker).enter(|scope| {
-      HandleScope::new(scope).enter(|_scope| {});
+    let mut isolate = Isolate::new(params);
+    let mut locker = Locker::new(&mut isolate);
+    HandleScope::enter(&mut locker, |scope| {
+      let l1 = Integer::new(scope, -123);
+      let l2 = Integer::new_from_unsigned(scope, 456);
+      HandleScope::enter(scope, |scope2| {
+        let l3 = Number::new(scope2, 78.9);
+        assert_eq!(l1.value(), -123);
+        assert_eq!(l2.value(), 456);
+        assert_eq!(l3.value(), 78.9);
+        assert_eq!(Number::value(&l1), -123f64);
+        assert_eq!(Number::value(&l2), 456f64);
+      });
     });
     drop(g);
   }

src/isolate.rs

@@ -1,4 +1,5 @@
 use std::ops::Deref;
+use std::ops::DerefMut;
 
 use crate::array_buffer::Allocator;
 use crate::support::Delete;
@@ -43,11 +44,17 @@ impl Drop for Isolate {
 
 impl Deref for Isolate {
   type Target = CxxIsolate;
-  fn deref(&self) -> &CxxIsolate {
+  fn deref(&self) -> &Self::Target {
     self.0
   }
 }
 
+impl DerefMut for Isolate {
+  fn deref_mut(&mut self) -> &mut Self::Target {
+    &mut self.0
+  }
+}
+
 #[repr(C)]
 pub struct CreateParams(Opaque);
 

src/lib.rs

@@ -13,6 +13,7 @@ pub mod array_buffer;
 pub mod handle_scope;
 pub mod inspector;
 pub mod isolate;
+pub mod local;
 pub mod locker;
 pub mod platform;
 pub mod string_buffer;
@@ -25,8 +26,12 @@ mod test_util;
 // C++ namespace "v8::V8".
 #[allow(non_snake_case)]
 pub mod V8;
+pub mod value;
 
+pub use handle_scope::HandleScope;
 pub use isolate::Isolate;
+pub use local::Local;
 pub use locker::Locker;
 pub use string_buffer::StringBuffer;
 pub use string_view::StringView;
+pub use value::{Integer, Number};

src/local.rs

@@ -0,0 +1,20 @@
+use std::ops::Deref;
+
+pub struct Local<'sc, T>(&'sc T);
+
+impl<'sc, T> Local<'sc, T> {
+  pub unsafe fn from_raw(ptr: *const T) -> Option<Self> {
+    if ptr.is_null() {
+      None
+    } else {
+      Some(Self(&*ptr))
+    }
+  }
+}
+
+impl<'sc, T> Deref for Local<'sc, T> {
+  type Target = T;
+  fn deref(&self) -> &T {
+    &self.0
+  }
+}

src/locker.rs

@@ -14,7 +14,10 @@ use crate::isolate::LockedIsolate;
 // }
 
 extern "C" {
-  fn v8__Locker__CONSTRUCT(buf: &mut MaybeUninit<Locker>, isolate: &CxxIsolate);
+  fn v8__Locker__CONSTRUCT(
+    buf: &mut MaybeUninit<Locker>,
+    isolate: &mut CxxIsolate,
+  );
   fn v8__Locker__DESTRUCT(this: &mut Locker);
 }
 
@@ -27,7 +30,7 @@ pub struct Locker<'a> {
 }
 
 impl<'a> Locker<'a> {
-  pub fn new(isolate: &CxxIsolate) -> Self {
+  pub fn new(isolate: &mut CxxIsolate) -> Self {
     let mut buf = MaybeUninit::<Self>::uninit();
     unsafe {
       v8__Locker__CONSTRUCT(&mut buf, isolate);

src/support.rs

@@ -178,24 +178,3 @@ impl<F> FieldOffset<F> {
       .unwrap()
   }
 }
-
-pub struct Scope<'a, T>(pub(crate) &'a mut T);
-
-impl<'a, T> Scope<'a, T> {
-  pub(crate) fn new(inner: &'a mut T) -> Self {
-    Self(inner)
-  }
-}
-
-impl<'a, T> Deref for Scope<'a, T> {
-  type Target = T;
-  fn deref(&self) -> &Self::Target {
-    &self.0
-  }
-}
-
-impl<'a, T> DerefMut for Scope<'a, T> {
-  fn deref_mut(&mut self) -> &mut Self::Target {
-    &mut self.0
-  }
-}

src/value.cc

@@ -0,0 +1,27 @@
+#include <cstdint>
+
+#include "v8/include/v8.h"
+
+using namespace v8;
+
+extern "C" {
+Number* v8__Number__New(Isolate* isolate, double value) {
+  return *Number::New(isolate, value);
+}
+
+double v8__Number__Value(const Number& self) {
+  return self.Value();
+}
+
+Integer* v8__Integer__New(Isolate* isolate, int32_t value) {
+  return *Integer::New(isolate, value);
+}
+
+Integer* v8__Integer__NewFromUnsigned(Isolate* isolate, uint32_t value) {
+  return *Integer::NewFromUnsigned(isolate, value);
+}
+
+int64_t v8__Integer__Value(const Integer& self) {
+  return self.Value();
+}
+}

src/value.rs

@@ -0,0 +1,73 @@
+use std::ops::Deref;
+
+use crate::isolate::CxxIsolate;
+use crate::isolate::LockedIsolate;
+use crate::support::Opaque;
+use crate::HandleScope;
+use crate::Local;
+
+extern "C" {
+  fn v8__Number__New(isolate: &mut CxxIsolate, value: f64) -> *const Number;
+  fn v8__Number__Value(this: &Number) -> f64;
+  fn v8__Integer__New(isolate: &mut CxxIsolate, value: i32) -> *const Integer;
+  fn v8__Integer__NewFromUnsigned(
+    isolate: &mut CxxIsolate,
+    value: u32,
+  ) -> *const Integer;
+  fn v8__Integer__Value(this: &Integer) -> i64;
+}
+
+#[repr(C)]
+pub struct Number(Opaque);
+
+impl Number {
+  pub fn new<'sc>(
+    scope: &mut HandleScope<'sc>,
+    value: f64,
+  ) -> Local<'sc, Number> {
+    unsafe {
+      let local = v8__Number__New(scope.cxx_isolate(), value);
+      Local::from_raw(local).unwrap()
+    }
+  }
+
+  pub fn value(&self) -> f64 {
+    unsafe { v8__Number__Value(self) }
+  }
+}
+
+#[repr(C)]
+pub struct Integer(Opaque);
+
+impl Integer {
+  pub fn new<'sc>(
+    scope: &mut HandleScope<'sc>,
+    value: i32,
+  ) -> Local<'sc, Integer> {
+    unsafe {
+      let local = v8__Integer__New(scope.cxx_isolate(), value);
+      Local::from_raw(local).unwrap()
+    }
+  }
+
+  pub fn new_from_unsigned<'sc>(
+    scope: &mut HandleScope<'sc>,
+    value: u32,
+  ) -> Local<'sc, Integer> {
+    unsafe {
+      let local = v8__Integer__NewFromUnsigned(scope.cxx_isolate(), value);
+      Local::from_raw(local).unwrap()
+    }
+  }
+
+  pub fn value(&self) -> i64 {
+    unsafe { v8__Integer__Value(self) }
+  }
+}
+
+impl Deref for Integer {
+  type Target = Number;
+  fn deref(&self) -> &Self::Target {
+    unsafe { &*(self as *const _ as *const Number) }
+  }
+}