Add v8::Map bindings (#872)

Support v8::Map operations (`new`, `clear`, `get`, `set`, `has`,
and `delete`).

src/binding.cc

@@ -1240,8 +1240,40 @@ const v8::External* v8__External__New(v8::Isolate* isolate, void* value) {
 
 void* v8__External__Value(const v8::External& self) { return self.Value(); }
 
+const v8::Map* v8__Map__New(v8::Isolate* isolate) {
+  return local_to_ptr(v8::Map::New(isolate));
+}
+
 size_t v8__Map__Size(const v8::Map& self) { return self.Size(); }
 
+void v8__Map__Clear(const v8::Map& self) {
+  return ptr_to_local(&self)->Clear();
+}
+
+const v8::Value* v8__Map__Get(const v8::Map& self, const v8::Context& context,
+                              const v8::Value& key) {
+  return maybe_local_to_ptr(
+      ptr_to_local(&self)->Get(ptr_to_local(&context), ptr_to_local(&key)));
+}
+
+v8::Map* v8__Map__Set(const v8::Map& self, const v8::Context& context,
+                      const v8::Value& key, const v8::Value& value) {
+  return maybe_local_to_ptr(ptr_to_local(&self)->Set(
+      ptr_to_local(&context), ptr_to_local(&key), ptr_to_local(&value)));
+}
+
+MaybeBool v8__Map__Has(const v8::Map& self, const v8::Context& context,
+                       const v8::Value& key) {
+  return maybe_to_maybe_bool(
+      ptr_to_local(&self)->Has(ptr_to_local(&context), ptr_to_local(&key)));
+}
+
+MaybeBool v8__Map__Delete(const v8::Map& self, const v8::Context& context,
+                          const v8::Value& key) {
+  return maybe_to_maybe_bool(
+      ptr_to_local(&self)->Delete(ptr_to_local(&context), ptr_to_local(&key)));
+}
+
 const v8::Array* v8__Map__As__Array(const v8::Map& self) {
   return local_to_ptr(self.AsArray());
 }
@@ -2437,8 +2469,8 @@ void v8__WasmStreaming__Abort(WasmStreamingSharedPtr* self,
   self->inner->Abort(ptr_to_maybe_local(exception));
 }
 
-void v8__WasmStreaming__SetUrl(WasmStreamingSharedPtr* self,
-                               const char* url, size_t len) {
+void v8__WasmStreaming__SetUrl(WasmStreamingSharedPtr* self, const char* url,
+                               size_t len) {
   self->inner->SetUrl(url, len);
 }
 
@@ -2478,7 +2510,8 @@ void v8__HeapProfiler__TakeHeapSnapshot(v8::Isolate* isolate,
 
 // This is necessary for v8__internal__GetIsolateFromHeapObject() to be
 // reliable enough for our purposes.
-#if UINTPTR_MAX == 0xffffffffffffffff && !(defined V8_SHARED_RO_HEAP or defined V8_COMPRESS_POINTERS)
+#if UINTPTR_MAX == 0xffffffffffffffff && \
+    !(defined V8_SHARED_RO_HEAP or defined V8_COMPRESS_POINTERS)
 #error V8 must be built with either the 'v8_enable_pointer_compression' or \
 'v8_enable_shared_ro_heap' feature enabled.
 #endif
@@ -2782,18 +2815,20 @@ bool v8__ValueDeserializer__ReadRawBytes(v8::ValueDeserializer* self,
 // v8::CompiledWasmModule
 
 extern "C" {
-const v8::WasmModuleObject* v8__WasmModuleObject__FromCompiledModule(v8::Isolate* isolate,
-                                                                     const v8::CompiledWasmModule* compiled_module) {
-  return maybe_local_to_ptr(v8::WasmModuleObject::FromCompiledModule(isolate, *compiled_module));
+const v8::WasmModuleObject* v8__WasmModuleObject__FromCompiledModule(
+    v8::Isolate* isolate, const v8::CompiledWasmModule* compiled_module) {
+  return maybe_local_to_ptr(
+      v8::WasmModuleObject::FromCompiledModule(isolate, *compiled_module));
 }
 
-v8::CompiledWasmModule* v8__WasmModuleObject__GetCompiledModule(const v8::WasmModuleObject* self) {
+v8::CompiledWasmModule* v8__WasmModuleObject__GetCompiledModule(
+    const v8::WasmModuleObject* self) {
   v8::CompiledWasmModule cwm = ptr_to_local(self)->GetCompiledModule();
   return new v8::CompiledWasmModule(std::move(cwm));
 }
 
-const uint8_t* v8__CompiledWasmModule__GetWireBytesRef(v8::CompiledWasmModule* self,
-                                                       size_t* length) {
+const uint8_t* v8__CompiledWasmModule__GetWireBytesRef(
+    v8::CompiledWasmModule* self, size_t* length) {
   v8::MemorySpan<const uint8_t> span = self->GetWireBytesRef();
   *length = span.size();
   return span.data();

src/object.rs

@@ -148,6 +148,29 @@ extern "C" {
     length: usize,
   ) -> *const Array;
   fn v8__Array__Length(array: *const Array) -> u32;
+  fn v8__Map__New(isolate: *mut Isolate) -> *const Map;
+  fn v8__Map__Clear(this: *const Map);
+  fn v8__Map__Get(
+    this: *const Map,
+    context: *const Context,
+    key: *const Value,
+  ) -> *const Value;
+  fn v8__Map__Set(
+    this: *const Map,
+    context: *const Context,
+    key: *const Value,
+    value: *const Value,
+  ) -> *const Map;
+  fn v8__Map__Has(
+    this: *const Map,
+    context: *const Context,
+    key: *const Value,
+  ) -> MaybeBool;
+  fn v8__Map__Delete(
+    this: *const Map,
+    context: *const Context,
+    key: *const Value,
+  ) -> MaybeBool;
   fn v8__Map__Size(map: *const Map) -> usize;
   fn v8__Map__As__Array(this: *const Map) -> *const Array;
 }
@@ -586,9 +609,59 @@ impl Array {
 }
 
 impl Map {
+  pub fn new<'s>(scope: &mut HandleScope<'s>) -> Local<'s, Map> {
+    unsafe { scope.cast_local(|sd| v8__Map__New(sd.get_isolate_ptr())) }
+      .unwrap()
+  }
+
   pub fn size(&self) -> usize {
     unsafe { v8__Map__Size(self) }
   }
+
+  pub fn clear(&self) {
+    unsafe { v8__Map__Clear(self) }
+  }
+
+  pub fn get<'s>(
+    &self,
+    scope: &mut HandleScope<'s>,
+    key: Local<Value>,
+  ) -> Option<Local<'s, Value>> {
+    unsafe {
+      scope.cast_local(|sd| v8__Map__Get(self, sd.get_current_context(), &*key))
+    }
+  }
+
+  pub fn set<'s>(
+    &self,
+    scope: &mut HandleScope<'s>,
+    key: Local<Value>,
+    value: Local<Value>,
+  ) -> Option<Local<'s, Map>> {
+    unsafe {
+      scope.cast_local(|sd| {
+        v8__Map__Set(self, sd.get_current_context(), &*key, &*value)
+      })
+    }
+  }
+
+  pub fn has(
+    &self,
+    scope: &mut HandleScope,
+    key: Local<Value>,
+  ) -> Option<bool> {
+    unsafe { v8__Map__Has(self, &*scope.get_current_context(), &*key) }.into()
+  }
+
+  pub fn delete(
+    &self,
+    scope: &mut HandleScope,
+    key: Local<Value>,
+  ) -> Option<bool> {
+    unsafe { v8__Map__Delete(self, &*scope.get_current_context(), &*key) }
+      .into()
+  }
+
   /// Returns an array of length size() * 2, where index N is the Nth key and
   /// index N + 1 is the Nth value.
   pub fn as_array<'s>(&self, scope: &mut HandleScope<'s>) -> Local<'s, Array> {

tests/test_api.rs

@@ -1556,6 +1556,50 @@ fn object() {
   }
 }
 
+#[test]
+fn map() {
+  let _setup_guard = setup();
+  let isolate = &mut v8::Isolate::new(Default::default());
+  {
+    let scope = &mut v8::HandleScope::new(isolate);
+    let context = v8::Context::new(scope);
+    let scope = &mut v8::ContextScope::new(scope, context);
+
+    let map = v8::Map::new(scope);
+    assert_eq!(map.size(), 0);
+
+    let undefined = v8::undefined(scope).into();
+
+    {
+      let key = v8::Object::new(scope).into();
+      let value = v8::Integer::new(scope, 1337).into();
+      assert_eq!(map.has(scope, key), Some(false));
+      assert_eq!(map.get(scope, key), Some(undefined));
+      assert_eq!(map.set(scope, key, value), Some(map));
+
+      assert_eq!(map.has(scope, key), Some(true));
+      assert_eq!(map.size(), 1);
+      assert_eq!(map.get(scope, key), Some(value));
+    }
+
+    map.clear();
+    assert_eq!(map.size(), 0);
+
+    {
+      let key = v8::String::new(scope, "key").unwrap().into();
+      let value = v8::Integer::new(scope, 42).into();
+
+      assert_eq!(map.delete(scope, key), Some(false));
+
+      map.set(scope, key, value);
+      assert_eq!(map.size(), 1);
+
+      assert_eq!(map.delete(scope, key), Some(true));
+      assert_eq!(map.size(), 0);
+    }
+  }
+}
+
 #[test]
 fn array() {
   let _setup_guard = setup();