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binding.cc
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binding.cc
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// Copyright 2018 the Deno authors. All rights reserved. MIT license.
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <string>
#include "third_party/v8/include/libplatform/libplatform.h"
#include "third_party/v8/include/v8.h"
#include "third_party/v8/src/base/logging.h"
#include "deno.h"
#include "internal.h"
namespace deno {
static bool skip_onerror = false;
Deno* FromIsolate(v8::Isolate* isolate) {
return static_cast<Deno*>(isolate->GetData(0));
}
// Extracts a C string from a v8::V8 Utf8Value.
const char* ToCString(const v8::String::Utf8Value& value) {
return *value ? *value : "<string conversion failed>";
}
static inline v8::Local<v8::String> v8_str(const char* x) {
return v8::String::NewFromUtf8(v8::Isolate::GetCurrent(), x,
v8::NewStringType::kNormal)
.ToLocalChecked();
}
void HandleExceptionStr(v8::Local<v8::Context> context,
v8::Local<v8::Value> exception,
std::string* exception_str) {
auto* isolate = context->GetIsolate();
v8::HandleScope handle_scope(isolate);
v8::Context::Scope context_scope(context);
auto message = v8::Exception::CreateMessage(isolate, exception);
auto onerrorStr = v8::String::NewFromUtf8(isolate, "onerror");
auto onerror = context->Global()->Get(onerrorStr);
auto stack_trace = message->GetStackTrace();
auto line =
v8::Integer::New(isolate, message->GetLineNumber(context).FromJust());
auto column =
v8::Integer::New(isolate, message->GetStartColumn(context).FromJust());
if (skip_onerror == false) {
if (onerror->IsFunction()) {
// window.onerror is set so we try to handle the exception in javascript.
auto func = v8::Local<v8::Function>::Cast(onerror);
v8::Local<v8::Value> args[5];
args[0] = exception->ToString();
args[1] = message->GetScriptResourceName();
args[2] = line;
args[3] = column;
args[4] = exception;
func->Call(context->Global(), 5, args);
/* message, source, lineno, colno, error */
}
}
char buf[12 * 1024];
if (!stack_trace.IsEmpty()) {
// No javascript onerror handler, but we do have a stack trace. Format it
// into a string and add to last_exception.
std::string msg;
v8::String::Utf8Value exceptionStr(isolate, exception);
msg += ToCString(exceptionStr);
msg += "\n";
for (int i = 0; i < stack_trace->GetFrameCount(); ++i) {
auto frame = stack_trace->GetFrame(i);
v8::String::Utf8Value script_name(isolate, frame->GetScriptName());
int l = frame->GetLineNumber();
int c = frame->GetColumn();
snprintf(buf, sizeof(buf), "%s %d:%d\n", ToCString(script_name), l, c);
msg += buf;
}
*exception_str += msg;
} else {
// No javascript onerror handler, no stack trace. Format the little info we
// have into a string and add to last_exception.
v8::String::Utf8Value exceptionStr(isolate, exception);
v8::String::Utf8Value script_name(isolate,
message->GetScriptResourceName());
v8::String::Utf8Value line_str(isolate, line);
v8::String::Utf8Value col_str(isolate, column);
snprintf(buf, sizeof(buf), "%s\n%s %s:%s\n", ToCString(exceptionStr),
ToCString(script_name), ToCString(line_str), ToCString(col_str));
*exception_str += buf;
}
}
void HandleException(v8::Local<v8::Context> context,
v8::Local<v8::Value> exception) {
v8::Isolate* isolate = context->GetIsolate();
Deno* d = FromIsolate(isolate);
std::string exception_str;
HandleExceptionStr(context, exception, &exception_str);
if (d != nullptr) {
d->last_exception = exception_str;
} else {
printf("Pre-Deno Exception %s\n", exception_str.c_str());
}
}
/*
bool AbortOnUncaughtExceptionCallback(v8::Isolate* isolate) {
return true;
}
void MessageCallback2(Local<Message> message, v8::Local<v8::Value> data) {
printf("MessageCallback2\n\n");
}
void FatalErrorCallback2(const char* location, const char* message) {
printf("FatalErrorCallback2\n");
}
*/
void ExitOnPromiseRejectCallback(
v8::PromiseRejectMessage promise_reject_message) {
auto* isolate = v8::Isolate::GetCurrent();
Deno* d = static_cast<Deno*>(isolate->GetData(0));
DCHECK_EQ(d->isolate, isolate);
v8::HandleScope handle_scope(d->isolate);
auto exception = promise_reject_message.GetValue();
auto context = d->context.Get(d->isolate);
HandleException(context, exception);
}
void Print(const v8::FunctionCallbackInfo<v8::Value>& args) {
CHECK_EQ(args.Length(), 1);
auto* isolate = args.GetIsolate();
v8::HandleScope handle_scope(isolate);
v8::String::Utf8Value str(isolate, args[0]);
const char* cstr = ToCString(str);
printf("%s\n", cstr);
fflush(stdout);
}
static v8::Local<v8::Uint8Array> ImportBuf(v8::Isolate* isolate, deno_buf buf) {
if (buf.alloc_ptr == nullptr) {
// If alloc_ptr isn't set, we memcpy.
// This is currently used for flatbuffers created in Rust.
auto ab = v8::ArrayBuffer::New(isolate, buf.data_len);
memcpy(ab->GetContents().Data(), buf.data_ptr, buf.data_len);
auto view = v8::Uint8Array::New(ab, 0, buf.data_len);
return view;
} else {
auto ab = v8::ArrayBuffer::New(
isolate, reinterpret_cast<void*>(buf.alloc_ptr), buf.alloc_len,
v8::ArrayBufferCreationMode::kInternalized);
auto view =
v8::Uint8Array::New(ab, buf.data_ptr - buf.alloc_ptr, buf.data_len);
return view;
}
}
static deno_buf ExportBuf(v8::Isolate* isolate,
v8::Local<v8::ArrayBufferView> view) {
auto ab = view->Buffer();
auto contents = ab->Externalize();
deno_buf buf;
buf.alloc_ptr = reinterpret_cast<uint8_t*>(contents.Data());
buf.alloc_len = contents.ByteLength();
buf.data_ptr = buf.alloc_ptr + view->ByteOffset();
buf.data_len = view->ByteLength();
// Prevent JS from modifying buffer contents after exporting.
ab->Neuter();
return buf;
}
static void FreeBuf(deno_buf buf) { free(buf.alloc_ptr); }
// Sets the recv callback.
void Recv(const v8::FunctionCallbackInfo<v8::Value>& args) {
v8::Isolate* isolate = args.GetIsolate();
Deno* d = reinterpret_cast<Deno*>(isolate->GetData(0));
DCHECK_EQ(d->isolate, isolate);
v8::HandleScope handle_scope(isolate);
if (!d->recv.IsEmpty()) {
isolate->ThrowException(v8_str("deno.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();
Deno* d = static_cast<Deno*>(isolate->GetData(0));
DCHECK_EQ(d->isolate, isolate);
v8::Locker locker(d->isolate);
v8::EscapableHandleScope handle_scope(isolate);
CHECK_EQ(args.Length(), 1);
v8::Local<v8::Value> ab_v = args[0];
CHECK(ab_v->IsArrayBufferView());
auto buf = ExportBuf(isolate, v8::Local<v8::ArrayBufferView>::Cast(ab_v));
DCHECK_EQ(d->currentArgs, nullptr);
d->currentArgs = &args;
d->cb(d, buf);
// Buffer is only valid until the end of the callback.
// TODO(piscisaureus):
// It's possible that data in the buffer is needed after the callback
// returns, e.g. when the handler offloads work to a thread pool, therefore
// make the callback responsible for releasing the buffer.
FreeBuf(buf);
d->currentArgs = nullptr;
}
bool ExecuteV8StringSource(v8::Local<v8::Context> context,
const char* js_filename,
v8::Local<v8::String> source) {
auto* isolate = context->GetIsolate();
v8::Isolate::Scope isolate_scope(isolate);
v8::HandleScope handle_scope(isolate);
v8::Context::Scope context_scope(context);
v8::TryCatch try_catch(isolate);
auto name = v8_str(js_filename);
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;
}
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);
auto source = v8_str(js_source);
return ExecuteV8StringSource(context, js_filename, source);
}
void InitializeContext(v8::Isolate* isolate, v8::Local<v8::Context> context,
const char* js_filename, const std::string& js_source,
const std::string* source_map) {
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 print_tmpl = v8::FunctionTemplate::New(isolate, Print);
auto print_val = print_tmpl->GetFunction(context).ToLocalChecked();
CHECK(deno_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(deno_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(deno_val->Set(context, deno::v8_str("send"), send_val).FromJust());
skip_onerror = true;
{
auto source = deno::v8_str(js_source.c_str());
CHECK(global->Set(context, deno::v8_str("mainSource"), source).FromJust());
bool r = deno::ExecuteV8StringSource(context, js_filename, source);
CHECK(r);
if (source_map != nullptr) {
CHECK_GT(source_map->length(), 1u);
std::string set_source_map = "setMainSourceMap( " + *source_map + " )";
CHECK_GT(set_source_map.length(), source_map->length());
r = deno::Execute(context, "set_source_map.js", set_source_map.c_str());
CHECK(r);
}
}
skip_onerror = false;
}
void AddIsolate(Deno* d, v8::Isolate* isolate) {
d->isolate = isolate;
// Leaving this code here because it will probably be useful later on, but
// disabling it now as I haven't got tests for the desired behavior.
// d->isolate->SetCaptureStackTraceForUncaughtExceptions(true);
// d->isolate->SetAbortOnUncaughtExceptionCallback(AbortOnUncaughtExceptionCallback);
// d->isolate->AddMessageListener(MessageCallback2);
// d->isolate->SetFatalErrorHandler(FatalErrorCallback2);
d->isolate->SetPromiseRejectCallback(deno::ExitOnPromiseRejectCallback);
d->isolate->SetData(0, d);
}
} // namespace deno
extern "C" {
void deno_init() {
// v8::V8::InitializeICUDefaultLocation(argv[0]);
// v8::V8::InitializeExternalStartupData(argv[0]);
auto* p = v8::platform::CreateDefaultPlatform();
v8::V8::InitializePlatform(p);
v8::V8::Initialize();
}
void* deno_get_data(Deno* d) { return d->data; }
const char* deno_v8_version() { return v8::V8::GetVersion(); }
// TODO(ry) Remove these when we call deno_reply_start from Rust.
static char** global_argv;
static int global_argc;
char** deno_argv() { return global_argv; }
int deno_argc() { return global_argc; }
void deno_set_flags(int* argc, char** argv) {
v8::V8::SetFlagsFromCommandLine(argc, argv, true);
// TODO(ry) Remove these when we call deno_reply_start from Rust.
global_argc = *argc;
global_argv = reinterpret_cast<char**>(malloc(*argc * sizeof(char*)));
for (int i = 0; i < *argc; i++) {
global_argv[i] = strdup(argv[i]);
}
}
const char* deno_last_exception(Deno* d) { return d->last_exception.c_str(); }
int deno_execute(Deno* d, const char* js_filename, const char* js_source) {
auto* isolate = d->isolate;
v8::Locker locker(isolate);
v8::Isolate::Scope isolate_scope(isolate);
v8::HandleScope handle_scope(isolate);
auto context = d->context.Get(d->isolate);
return deno::Execute(context, js_filename, js_source) ? 1 : 0;
}
int deno_send(Deno* d, deno_buf buf) {
v8::Locker locker(d->isolate);
v8::Isolate::Scope isolate_scope(d->isolate);
v8::HandleScope handle_scope(d->isolate);
auto context = d->context.Get(d->isolate);
v8::Context::Scope context_scope(context);
v8::TryCatch try_catch(d->isolate);
auto recv = d->recv.Get(d->isolate);
if (recv.IsEmpty()) {
d->last_exception = "deno.recv has not been called.";
return 0;
}
v8::Local<v8::Value> args[1];
args[0] = deno::ImportBuf(d->isolate, buf);
recv->Call(context->Global(), 1, args);
if (try_catch.HasCaught()) {
deno::HandleException(context, try_catch.Exception());
return 0;
}
return 1;
}
void deno_set_response(Deno* d, deno_buf buf) {
auto ab = deno::ImportBuf(d->isolate, buf);
d->currentArgs->GetReturnValue().Set(ab);
}
void deno_delete(Deno* d) {
d->isolate->Dispose();
delete d;
}
void deno_terminate_execution(Deno* d) { d->isolate->TerminateExecution(); }
} // extern "C"