1
0
Fork 0
mirror of https://github.com/denoland/deno.git synced 2024-12-22 23:34:47 -05:00
denoland-deno/core/libdeno/binding.cc
2019-09-15 22:12:12 +02:00

597 lines
20 KiB
C++

// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <algorithm>
#include <iostream>
#include <string>
#ifdef _WIN32
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif
#include <io.h>
#include <windows.h>
#endif // _WIN32
#include "v8/include/v8.h"
#include "v8/src/base/logging.h"
#include "deno.h"
#include "exceptions.h"
#include "internal.h"
#define GLOBAL_IMPORT_BUF_SIZE 1024
namespace deno {
std::vector<InternalFieldData*> deserialized_data;
void DeserializeInternalFields(v8::Local<v8::Object> holder, int index,
v8::StartupData payload, void* data) {
DCHECK_NULL(data);
if (payload.raw_size == 0) {
holder->SetAlignedPointerInInternalField(index, nullptr);
return;
}
InternalFieldData* embedder_field = new InternalFieldData{0};
memcpy(embedder_field, payload.data, payload.raw_size);
holder->SetAlignedPointerInInternalField(index, embedder_field);
deserialized_data.push_back(embedder_field);
}
v8::StartupData SerializeInternalFields(v8::Local<v8::Object> holder, int index,
void* data) {
DCHECK_NULL(data);
InternalFieldData* embedder_field = static_cast<InternalFieldData*>(
holder->GetAlignedPointerFromInternalField(index));
if (embedder_field == nullptr) return {nullptr, 0};
int size = sizeof(*embedder_field);
char* payload = new char[size];
// We simply use memcpy to serialize the content.
memcpy(payload, embedder_field, size);
return {payload, size};
}
// Extracts a C string from a v8::V8 Utf8Value.
const char* ToCString(const v8::String::Utf8Value& value) {
return *value ? *value : "<string conversion failed>";
}
void PromiseRejectCallback(v8::PromiseRejectMessage promise_reject_message) {
auto* isolate = v8::Isolate::GetCurrent();
DenoIsolate* d = static_cast<DenoIsolate*>(isolate->GetData(0));
DCHECK_EQ(d->isolate_, isolate);
v8::HandleScope handle_scope(d->isolate_);
auto error = promise_reject_message.GetValue();
auto context = d->context_.Get(d->isolate_);
auto promise = promise_reject_message.GetPromise();
v8::Context::Scope context_scope(context);
int promise_id = promise->GetIdentityHash();
switch (promise_reject_message.GetEvent()) {
case v8::kPromiseRejectWithNoHandler:
// Insert the error into the pending_promise_map_ using the promise's id
// as the key.
d->pending_promise_map_.emplace(std::piecewise_construct,
std::make_tuple(promise_id),
std::make_tuple(d->isolate_, error));
break;
case v8::kPromiseHandlerAddedAfterReject:
d->pending_promise_map_.erase(promise_id);
break;
case v8::kPromiseRejectAfterResolved:
break;
case v8::kPromiseResolveAfterResolved:
// Should not warn. See #1272
break;
default:
CHECK(false && "unreachable");
}
}
void Print(const v8::FunctionCallbackInfo<v8::Value>& args) {
auto* isolate = args.GetIsolate();
int argsLen = args.Length();
if (argsLen < 1 || argsLen > 2) {
ThrowInvalidArgument(isolate);
}
v8::HandleScope handle_scope(isolate);
bool is_err = args.Length() >= 2 ? args[1]->BooleanValue(isolate) : false;
FILE* file = is_err ? stderr : stdout;
#ifdef _WIN32
int fd = _fileno(file);
if (fd < 0) return;
HANDLE h = reinterpret_cast<HANDLE>(_get_osfhandle(fd));
if (h == INVALID_HANDLE_VALUE) return;
DWORD mode;
if (GetConsoleMode(h, &mode)) {
// Print to Windows console. Since the Windows API generally doesn't support
// UTF-8 encoded text, we have to use `WriteConsoleW()` which uses UTF-16.
v8::String::Value str(isolate, args[0]);
auto str_len = static_cast<size_t>(str.length());
auto str_wchars = reinterpret_cast<WCHAR*>(*str);
// WriteConsoleW has some limit to how many characters can be written at
// once, which is unspecified but low enough to be encountered in practice.
// Therefore we break up the write into chunks of 8kb if necessary.
size_t chunk_start = 0;
while (chunk_start < str_len) {
size_t chunk_end = std::min(chunk_start + 8192, str_len);
// Do not break in the middle of a surrogate pair. Note that `chunk_end`
// points to the start of the next chunk, so we check whether it contains
// the second half of a surrogate pair (a.k.a. "low surrogate").
if (chunk_end < str_len && str_wchars[chunk_end] >= 0xdc00 &&
str_wchars[chunk_end] <= 0xdfff) {
--chunk_end;
}
// Write to the console.
DWORD chunk_len = static_cast<DWORD>(chunk_end - chunk_start);
DWORD _;
WriteConsoleW(h, &str_wchars[chunk_start], chunk_len, &_, nullptr);
chunk_start = chunk_end;
}
return;
}
#endif // _WIN32
v8::String::Utf8Value str(isolate, args[0]);
fwrite(*str, sizeof(**str), str.length(), file);
fflush(file);
}
void ErrorToJSON(const v8::FunctionCallbackInfo<v8::Value>& args) {
CHECK_EQ(args.Length(), 1);
auto* isolate = args.GetIsolate();
DenoIsolate* d = DenoIsolate::FromIsolate(isolate);
auto context = d->context_.Get(d->isolate_);
v8::HandleScope handle_scope(isolate);
auto json_string = EncodeExceptionAsJSON(context, args[0]);
args.GetReturnValue().Set(v8_str(json_string.c_str()));
}
v8::Local<v8::Uint8Array> ImportBuf(DenoIsolate* d, deno_buf buf) {
if (buf.data_ptr == nullptr) {
return v8::Local<v8::Uint8Array>();
}
// To avoid excessively allocating new ArrayBuffers, we try to reuse a single
// global ArrayBuffer. The caveat is that users must extract data from it
// before the next tick. We only do this for ArrayBuffers less than 1024
// bytes.
v8::Local<v8::ArrayBuffer> ab;
void* data;
if (buf.data_len > GLOBAL_IMPORT_BUF_SIZE) {
// Simple case. We allocate a new ArrayBuffer for this.
ab = v8::ArrayBuffer::New(d->isolate_, buf.data_len);
data = ab->GetContents().Data();
} else {
// Fast case. We reuse the global ArrayBuffer.
if (d->global_import_buf_.IsEmpty()) {
// Lazily initialize it.
DCHECK_NULL(d->global_import_buf_ptr_);
ab = v8::ArrayBuffer::New(d->isolate_, GLOBAL_IMPORT_BUF_SIZE);
d->global_import_buf_.Reset(d->isolate_, ab);
d->global_import_buf_ptr_ = ab->GetContents().Data();
} else {
DCHECK(d->global_import_buf_ptr_);
ab = d->global_import_buf_.Get(d->isolate_);
}
data = d->global_import_buf_ptr_;
}
memcpy(data, buf.data_ptr, buf.data_len);
auto view = v8::Uint8Array::New(ab, 0, buf.data_len);
return view;
}
// Sets the recv_ callback.
void Recv(const v8::FunctionCallbackInfo<v8::Value>& args) {
v8::Isolate* isolate = args.GetIsolate();
DenoIsolate* d = DenoIsolate::FromIsolate(isolate);
DCHECK_EQ(d->isolate_, isolate);
v8::HandleScope handle_scope(isolate);
if (!d->recv_.IsEmpty()) {
isolate->ThrowException(v8_str("Deno.core.recv already called."));
return;
}
v8::Local<v8::Value> v = args[0];
CHECK(v->IsFunction());
v8::Local<v8::Function> func = v8::Local<v8::Function>::Cast(v);
d->recv_.Reset(isolate, func);
}
void Send(const v8::FunctionCallbackInfo<v8::Value>& args) {
v8::Isolate* isolate = args.GetIsolate();
DenoIsolate* d = DenoIsolate::FromIsolate(isolate);
DCHECK_EQ(d->isolate_, isolate);
v8::HandleScope handle_scope(isolate);
deno_buf control = {nullptr, 0};
int32_t op_id = 0;
if (args[0]->IsInt32()) {
auto context = d->context_.Get(isolate);
op_id = args[0]->Int32Value(context).FromJust();
}
if (args[1]->IsArrayBufferView()) {
auto view = v8::Local<v8::ArrayBufferView>::Cast(args[1]);
auto data =
reinterpret_cast<uint8_t*>(view->Buffer()->GetContents().Data());
control = {data + view->ByteOffset(), view->ByteLength()};
}
PinnedBuf zero_copy =
args[2]->IsArrayBufferView()
? PinnedBuf(v8::Local<v8::ArrayBufferView>::Cast(args[2]))
: PinnedBuf();
DCHECK_NULL(d->current_args_);
d->current_args_ = &args;
d->recv_cb_(d->user_data_, op_id, control, zero_copy.IntoRaw());
if (d->current_args_ == nullptr) {
// This indicates that deno_repond() was called already.
} else {
// Asynchronous.
d->current_args_ = nullptr;
}
}
v8::ScriptOrigin ModuleOrigin(v8::Isolate* isolate,
v8::Local<v8::Value> resource_name) {
return v8::ScriptOrigin(resource_name, v8::Local<v8::Integer>(),
v8::Local<v8::Integer>(), v8::Local<v8::Boolean>(),
v8::Local<v8::Integer>(), v8::Local<v8::Value>(),
v8::Local<v8::Boolean>(), v8::Local<v8::Boolean>(),
v8::True(isolate));
}
deno_mod DenoIsolate::RegisterModule(bool main, const char* name,
const char* source) {
v8::Isolate::Scope isolate_scope(isolate_);
v8::Locker locker(isolate_);
v8::HandleScope handle_scope(isolate_);
auto context = context_.Get(isolate_);
v8::Context::Scope context_scope(context);
v8::Local<v8::String> name_str = v8_str(name);
v8::Local<v8::String> source_str = v8_str(source);
auto origin = ModuleOrigin(isolate_, name_str);
v8::ScriptCompiler::Source source_(source_str, origin);
v8::TryCatch try_catch(isolate_);
auto maybe_module = v8::ScriptCompiler::CompileModule(isolate_, &source_);
if (try_catch.HasCaught()) {
CHECK(maybe_module.IsEmpty());
HandleException(context, try_catch.Exception());
return 0;
}
auto module = maybe_module.ToLocalChecked();
int id = module->GetIdentityHash();
std::vector<std::string> import_specifiers;
for (int i = 0; i < module->GetModuleRequestsLength(); ++i) {
v8::Local<v8::String> specifier = module->GetModuleRequest(i);
v8::String::Utf8Value specifier_utf8(isolate_, specifier);
import_specifiers.push_back(*specifier_utf8);
}
mods_.emplace(
std::piecewise_construct, std::make_tuple(id),
std::make_tuple(isolate_, module, main, name, import_specifiers));
mods_by_name_[name] = id;
return id;
}
void Shared(v8::Local<v8::Name> property,
const v8::PropertyCallbackInfo<v8::Value>& info) {
v8::Isolate* isolate = info.GetIsolate();
DenoIsolate* d = DenoIsolate::FromIsolate(isolate);
DCHECK_EQ(d->isolate_, isolate);
v8::Locker locker(d->isolate_);
v8::EscapableHandleScope handle_scope(isolate);
if (d->shared_.data_ptr == nullptr) {
return;
}
v8::Local<v8::SharedArrayBuffer> ab;
if (d->shared_ab_.IsEmpty()) {
// Lazily initialize the persistent external ArrayBuffer.
ab = v8::SharedArrayBuffer::New(isolate, d->shared_.data_ptr,
d->shared_.data_len,
v8::ArrayBufferCreationMode::kExternalized);
d->shared_ab_.Reset(isolate, ab);
}
auto shared_ab = d->shared_ab_.Get(isolate);
info.GetReturnValue().Set(shared_ab);
}
void DenoIsolate::ClearModules() {
for (auto it = mods_.begin(); it != mods_.end(); it++) {
it->second.handle.Reset();
}
mods_.clear();
mods_by_name_.clear();
}
bool Execute(v8::Local<v8::Context> context, const char* js_filename,
const char* js_source) {
auto* isolate = context->GetIsolate();
v8::Isolate::Scope isolate_scope(isolate);
v8::HandleScope handle_scope(isolate);
v8::Context::Scope context_scope(context);
auto source = v8_str(js_source);
auto name = v8_str(js_filename);
v8::TryCatch try_catch(isolate);
v8::ScriptOrigin origin(name);
auto script = v8::Script::Compile(context, source, &origin);
if (script.IsEmpty()) {
DCHECK(try_catch.HasCaught());
HandleException(context, try_catch.Exception());
return false;
}
auto result = script.ToLocalChecked()->Run(context);
if (result.IsEmpty()) {
DCHECK(try_catch.HasCaught());
HandleException(context, try_catch.Exception());
return false;
}
return true;
}
static inline v8::Local<v8::Boolean> v8_bool(bool v) {
return v8::Boolean::New(v8::Isolate::GetCurrent(), v);
}
void EvalContext(const v8::FunctionCallbackInfo<v8::Value>& args) {
v8::Isolate* isolate = args.GetIsolate();
DenoIsolate* d = DenoIsolate::FromIsolate(isolate);
v8::EscapableHandleScope handleScope(isolate);
auto context = d->context_.Get(isolate);
v8::Context::Scope context_scope(context);
if (!(args[0]->IsString())) {
ThrowInvalidArgument(isolate);
return;
}
auto source = args[0].As<v8::String>();
auto output = v8::Array::New(isolate, 2);
/**
* output[0] = result
* output[1] = ErrorInfo | null
* ErrorInfo = {
* thrown: Error | any,
* isNativeError: boolean,
* isCompileError: boolean,
* }
*/
v8::TryCatch try_catch(isolate);
auto name = v8_str("<unknown>");
v8::ScriptOrigin origin(name);
auto script = v8::Script::Compile(context, source, &origin);
if (script.IsEmpty()) {
CHECK(try_catch.HasCaught());
auto exception = try_catch.Exception();
CHECK(output->Set(context, 0, v8::Null(isolate)).FromJust());
auto errinfo_obj = v8::Object::New(isolate);
CHECK(errinfo_obj->Set(context, v8_str("isCompileError"), v8_bool(true))
.FromJust());
CHECK(errinfo_obj
->Set(context, v8_str("isNativeError"),
v8_bool(exception->IsNativeError()))
.FromJust());
CHECK(errinfo_obj->Set(context, v8_str("thrown"), exception).FromJust());
CHECK(output->Set(context, 1, errinfo_obj).FromJust());
args.GetReturnValue().Set(output);
return;
}
auto result = script.ToLocalChecked()->Run(context);
if (result.IsEmpty()) {
CHECK(try_catch.HasCaught());
auto exception = try_catch.Exception();
CHECK(output->Set(context, 0, v8::Null(isolate)).FromJust());
auto errinfo_obj = v8::Object::New(isolate);
CHECK(errinfo_obj->Set(context, v8_str("isCompileError"), v8_bool(false))
.FromJust());
CHECK(errinfo_obj
->Set(context, v8_str("isNativeError"),
v8_bool(exception->IsNativeError()))
.FromJust());
CHECK(errinfo_obj->Set(context, v8_str("thrown"), exception).FromJust());
CHECK(output->Set(context, 1, errinfo_obj).FromJust());
args.GetReturnValue().Set(output);
return;
}
CHECK(output->Set(context, 0, result.ToLocalChecked()).FromJust());
CHECK(output->Set(context, 1, v8::Null(isolate)).FromJust());
args.GetReturnValue().Set(output);
}
void QueueMicrotask(const v8::FunctionCallbackInfo<v8::Value>& args) {
v8::Isolate* isolate = args.GetIsolate();
if (!(args[0]->IsFunction())) {
ThrowInvalidArgument(isolate);
return;
}
isolate->EnqueueMicrotask(args[0].As<v8::Function>());
}
void InitializeContext(v8::Isolate* isolate, v8::Local<v8::Context> context) {
v8::HandleScope handle_scope(isolate);
v8::Context::Scope context_scope(context);
auto global = context->Global();
auto deno_val = v8::Object::New(isolate);
CHECK(global->Set(context, deno::v8_str("Deno"), deno_val).FromJust());
auto core_val = v8::Object::New(isolate);
CHECK(deno_val->Set(context, deno::v8_str("core"), core_val).FromJust());
auto print_tmpl = v8::FunctionTemplate::New(isolate, Print);
auto print_val = print_tmpl->GetFunction(context).ToLocalChecked();
CHECK(core_val->Set(context, deno::v8_str("print"), print_val).FromJust());
auto recv_tmpl = v8::FunctionTemplate::New(isolate, Recv);
auto recv_val = recv_tmpl->GetFunction(context).ToLocalChecked();
CHECK(core_val->Set(context, deno::v8_str("recv"), recv_val).FromJust());
auto send_tmpl = v8::FunctionTemplate::New(isolate, Send);
auto send_val = send_tmpl->GetFunction(context).ToLocalChecked();
CHECK(core_val->Set(context, deno::v8_str("send"), send_val).FromJust());
auto eval_context_tmpl = v8::FunctionTemplate::New(isolate, EvalContext);
auto eval_context_val =
eval_context_tmpl->GetFunction(context).ToLocalChecked();
CHECK(core_val->Set(context, deno::v8_str("evalContext"), eval_context_val)
.FromJust());
auto error_to_json_tmpl = v8::FunctionTemplate::New(isolate, ErrorToJSON);
auto error_to_json_val =
error_to_json_tmpl->GetFunction(context).ToLocalChecked();
CHECK(core_val->Set(context, deno::v8_str("errorToJSON"), error_to_json_val)
.FromJust());
CHECK(core_val->SetAccessor(context, deno::v8_str("shared"), Shared)
.FromJust());
// Direct bindings on `window`.
auto queue_microtask_tmpl =
v8::FunctionTemplate::New(isolate, QueueMicrotask);
auto queue_microtask_val =
queue_microtask_tmpl->GetFunction(context).ToLocalChecked();
CHECK(
global->Set(context, deno::v8_str("queueMicrotask"), queue_microtask_val)
.FromJust());
}
void MessageCallback(v8::Local<v8::Message> message,
v8::Local<v8::Value> data) {
auto* isolate = message->GetIsolate();
DenoIsolate* d = static_cast<DenoIsolate*>(isolate->GetData(0));
v8::HandleScope handle_scope(isolate);
auto context = d->context_.Get(isolate);
HandleExceptionMessage(context, message);
}
void HostInitializeImportMetaObjectCallback(v8::Local<v8::Context> context,
v8::Local<v8::Module> module,
v8::Local<v8::Object> meta) {
auto* isolate = context->GetIsolate();
DenoIsolate* d = DenoIsolate::FromIsolate(isolate);
v8::Isolate::Scope isolate_scope(isolate);
CHECK(!module.IsEmpty());
deno_mod id = module->GetIdentityHash();
CHECK_NE(id, 0);
auto* info = d->GetModuleInfo(id);
const char* url = info->name.c_str();
const bool main = info->main;
meta->CreateDataProperty(context, v8_str("url"), v8_str(url)).ToChecked();
meta->CreateDataProperty(context, v8_str("main"), v8_bool(main)).ToChecked();
}
v8::MaybeLocal<v8::Promise> HostImportModuleDynamicallyCallback(
v8::Local<v8::Context> context, v8::Local<v8::ScriptOrModule> referrer,
v8::Local<v8::String> specifier) {
auto* isolate = context->GetIsolate();
DenoIsolate* d = DenoIsolate::FromIsolate(isolate);
v8::Isolate::Scope isolate_scope(isolate);
v8::Context::Scope context_scope(context);
v8::EscapableHandleScope handle_scope(isolate);
v8::String::Utf8Value specifier_str(isolate, specifier);
auto referrer_name = referrer->GetResourceName();
v8::String::Utf8Value referrer_name_str(isolate, referrer_name);
// TODO(ry) I'm not sure what HostDefinedOptions is for or if we're ever going
// to use it. For now we check that it is not used. This check may need to be
// changed in the future.
auto host_defined_options = referrer->GetHostDefinedOptions();
CHECK_EQ(host_defined_options->Length(), 0);
v8::Local<v8::Promise::Resolver> resolver =
v8::Promise::Resolver::New(context).ToLocalChecked();
deno_dyn_import_id import_id = d->next_dyn_import_id_++;
d->dyn_import_map_.emplace(std::piecewise_construct,
std::make_tuple(import_id),
std::make_tuple(d->isolate_, resolver));
d->dyn_import_cb_(d->user_data_, *specifier_str, *referrer_name_str,
import_id);
auto promise = resolver->GetPromise();
return handle_scope.Escape(promise);
}
void DenoIsolate::AddIsolate(v8::Isolate* isolate) {
isolate_ = isolate;
isolate_->SetCaptureStackTraceForUncaughtExceptions(
true, 10, v8::StackTrace::kDetailed);
isolate_->SetPromiseRejectCallback(deno::PromiseRejectCallback);
isolate_->SetData(0, this);
isolate_->AddMessageListener(MessageCallback);
isolate->SetHostInitializeImportMetaObjectCallback(
HostInitializeImportMetaObjectCallback);
isolate->SetHostImportModuleDynamicallyCallback(
HostImportModuleDynamicallyCallback);
}
} // namespace deno