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Unified Diff: mojo/public/bindings/js/v8_core.cc

Issue 59153005: Begin implementing V8 bindings for Mojo (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src
Patch Set: spelling Created 7 years, 1 month ago
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Index: mojo/public/bindings/js/v8_core.cc
diff --git a/mojo/public/bindings/js/v8_core.cc b/mojo/public/bindings/js/v8_core.cc
new file mode 100644
index 0000000000000000000000000000000000000000..69ce205b637236ba3d8f11ccdbdf8b31798e6ff8
--- /dev/null
+++ b/mojo/public/bindings/js/v8_core.cc
@@ -0,0 +1,177 @@
+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "mojo/public/bindings/js/v8_core.h"
+
+#include "mojo/public/bindings/js/v8_array_buffer.h"
+#include "mojo/public/bindings/js/v8_conversions.h"
+#include "mojo/public/bindings/js/v8_exceptions.h"
+#include "mojo/public/bindings/js/v8_per_isolate_data.h"
+
+namespace mojo {
+namespace js {
+
+namespace {
+
+static WrapperInfo g_handle_wrapper_info = {};
Aaron Boodman 2013/11/09 08:26:02 We aren't supposed to have non-primitive static da
abarth-chromium 2013/11/09 08:52:37 WrapperInfo is POD. It doesn't have any static in
Aaron Boodman 2013/11/09 21:12:12 It seems like that should be OK logically, but I v
+
+bool ToHandleArray(v8::Isolate* isolate,
+ v8::Handle<v8::Value> value,
+ std::vector<mojo::Handle>* handles) {
+ if (!value->IsArray()) {
Aaron Boodman 2013/11/09 08:26:02 It seems like Wrapper<std::vector<mojo::Handle>> s
abarth-chromium 2013/11/09 08:52:37 Good point.
+ ThrowTypeError(isolate, "Expected array argument.");
+ return false;
+ }
+ if (!ToNativeArray(v8::Handle<v8::Array>::Cast(value), handles)) {
+ ThrowTypeError(isolate, "Expected an array of mojo::Handles.");
+ return false;
+ }
+ return true;
+}
+
+void CloseCallback(const v8::FunctionCallbackInfo<v8::Value>& info) {
Aaron Boodman 2013/11/09 08:26:02 I think the term 'callback' here is confusing beca
abarth-chromium 2013/11/09 08:52:37 Sorry, that's terminology from the Blink bindings
+ v8::Isolate* isolate = info.GetIsolate();
+ mojo::Handle handle = Wrapper<Handle>::ToNativeUnchecked(info.Holder());
+
+ MojoResult result = mojo::Close(handle);
+ info.GetReturnValue().Set(Wrapper<MojoResult>::ToObject(isolate, result));
+}
+
+void WaitCallback(const v8::FunctionCallbackInfo<v8::Value>& info) {
+ v8::Isolate* isolate = info.GetIsolate();
+
+ if (info.Length() < 2)
Aaron Boodman 2013/11/09 08:26:02 In my experience, this kind of code quickly gets i
abarth-chromium 2013/11/09 08:52:37 Ok. I'll work something up along those lines.
+ return ThrowTypeError(isolate, kInsufficientArguments);
+
+ mojo::Handle handle = Wrapper<Handle>::ToNativeUnchecked(info.Holder());
+ MojoWaitFlags flags = Wrapper<MojoWaitFlags>::ToNative(info[0]);
+ MojoDeadline deadline = Wrapper<MojoDeadline>::ToNative(info[1]);
+
+ MojoResult result = mojo::Wait(handle, flags, deadline);
+ info.GetReturnValue().Set(Wrapper<MojoResult>::ToObject(isolate, result));
+}
+
+void WriteMessageCallback(const v8::FunctionCallbackInfo<v8::Value>& info) {
+ v8::Isolate* isolate = info.GetIsolate();
+
+ if (info.Length() < 3)
+ return ThrowTypeError(isolate, kInsufficientArguments);
+
+ mojo::Handle handle = Wrapper<Handle>::ToNativeUnchecked(info.Holder());
+
+ if (!info[0]->IsArrayBufferView())
+ return ThrowTypeError(isolate, "Expected an ArrayBufferView.");
+ BufferView buffer(isolate, v8::Handle<v8::ArrayBufferView>::Cast(info[0]));
Aaron Boodman 2013/11/09 08:26:02 It would be cool if BufferView could again have a
abarth-chromium 2013/11/09 08:52:37 Ok. I'll have to do some more work to make Buffer
+
+ std::vector<mojo::Handle> handles;
+ if (!ToHandleArray(isolate, info[1], &handles))
+ return;
+
+ MojoWaitFlags flags = Wrapper<MojoWaitFlags>::ToNative(info[2]);
+
+ MojoResult result = mojo::WriteMessage(handle,
+ buffer.bytes(),
+ buffer.num_bytes(),
+ handles.data(),
+ handles.size(),
+ flags);
+
+ info.GetReturnValue().Set(Wrapper<MojoResult>::ToObject(isolate, result));
+}
+
+void ReadMessageCallback(const v8::FunctionCallbackInfo<v8::Value>& info) {
+ v8::Isolate* isolate = info.GetIsolate();
+
+ if (info.Length() < 3)
+ return ThrowTypeError(isolate, kInsufficientArguments);
+
+ mojo::Handle handle = Wrapper<Handle>::ToNativeUnchecked(info.Holder());
+
+ if (!info[0]->IsArrayBufferView())
+ return ThrowTypeError(isolate, "Expected an ArrayBufferView.");
+ BufferView buffer(isolate, v8::Handle<v8::ArrayBufferView>::Cast(info[0]));
+
+ std::vector<mojo::Handle> handles(info[1]->Uint32Value());
+
+ MojoWaitFlags flags = Wrapper<MojoWaitFlags>::ToNative(info[2]);
+
+ uint32_t num_bytes = buffer.num_bytes();
+ uint32_t num_handles = handles.size();
+ MojoResult result = mojo::ReadMessage(handle,
+ buffer.bytes(),
+ &num_bytes,
+ handles.data(),
+ &num_handles,
+ flags);
+ handles.resize(num_handles);
+
+ // TODO(abarth): We should benchmark this codepath to make sure it's ok to
+ // allocate all this memory on each read.
+
+ v8::Handle<v8::Object> object = v8::Object::New();
+ object->Set(v8::String::NewSymbol("result"),
+ Wrapper<MojoResult>::ToObject(isolate, result));
+ object->Set(v8::String::NewSymbol("bytesRead"),
+ Wrapper<uint32_t>::ToObject(isolate, num_bytes));
+ object->Set(v8::String::NewSymbol("handles"),
+ ToObjectArray(isolate, handles));
+ info.GetReturnValue().Set(object);
+}
+
+// TODO(abarth): Implement these functions. Unlike the functions above,
+// these functions don't operate on an individual handle.
+//
+// MojoResult WaitMany(const Handle* handles,
+// const MojoWaitFlags* flags,
+// uint32_t num_handles,
+// MojoDeadline deadline);
+// MojoResult CreateMessagePipe(Handle* handle_0, Handle* handle_1);
+
+}
+
+v8::Local<v8::ObjectTemplate> Wrapper<mojo::Handle>::CreateTemplate() {
+ v8::Local<v8::ObjectTemplate> handle_template = v8::ObjectTemplate::New();
+ handle_template->SetInternalFieldCount(kNumberOfInternalFields);
+ handle_template->Set(v8::String::NewSymbol("close"),
+ v8::FunctionTemplate::New(CloseCallback));
+ handle_template->Set(v8::String::NewSymbol("wait"),
+ v8::FunctionTemplate::New(WaitCallback));
+ handle_template->Set(v8::String::NewSymbol("writeMessage"),
+ v8::FunctionTemplate::New(WriteMessageCallback));
+ handle_template->Set(v8::String::NewSymbol("readMessage"),
+ v8::FunctionTemplate::New(ReadMessageCallback));
+ return handle_template;
+}
+
+bool Wrapper<mojo::Handle>::HasInstance(v8::Handle<v8::Object> object) {
+ return WrapperInfo::From(object) == &g_handle_wrapper_info;
+}
+
+v8::Handle<v8::Object> Wrapper<mojo::Handle>::ToObject(
+ v8::Isolate* isolate, mojo::Handle handle) {
+ V8PerIsolateData* data = V8PerIsolateData::From(isolate);
+ v8::Local<v8::Object> object = data->handle_template()->NewInstance();
+ object->SetAlignedPointerInInternalField(
+ kWrapperInfoIndex, &g_handle_wrapper_info);
+ object->SetInternalField(
+ kEncodedValueIndex, v8::Integer::NewFromUnsigned(handle.value, isolate));
+ return object;
+}
+
+mojo::Handle Wrapper<mojo::Handle>::ToNative(
+ v8::Handle<v8::Object> object) {
+ if (!HasInstance(object))
+ return mojo::kInvalidHandle;
+ return ToNativeUnchecked(object);
+}
+
+mojo::Handle Wrapper<mojo::Handle>::ToNativeUnchecked(
+ v8::Handle<v8::Object> object) {
+ v8::Handle<v8::Value> field = object->GetInternalField(kEncodedValueIndex);
+ mojo::Handle handle = { field->Uint32Value() };
+ return handle;
+}
+
+} // namespace js
+} // mojo

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