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// Copyright 2018 Ryan Dahl <ry@tinyclouds.org>
// All rights reserved. MIT License.
// Hint: --trace_serializer is a useful debugging flag.
#include <fstream>
#include "deno.h"
#include "file_util.h"
#include "internal.h"
#include "third_party/v8/include/v8.h"
#include "third_party/v8/src/base/logging.h"
namespace deno {
v8::StartupData SerializeInternalFields(v8::Local<v8::Object> holder, int index,
void* data) {
DCHECK_EQ(data, nullptr);
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};
}
v8::StartupData MakeSnapshot(const char* js_filename, const char* js_source) {
auto* creator = new v8::SnapshotCreator(external_references);
auto* isolate = creator->GetIsolate();
v8::Isolate::Scope isolate_scope(isolate);
{
v8::HandleScope handle_scope(isolate);
auto context = v8::Context::New(isolate);
InitializeContext(isolate, context, js_filename, js_source);
creator->SetDefaultContext(context, v8::SerializeInternalFieldsCallback(
SerializeInternalFields, nullptr));
}
auto snapshot_blob =
creator->CreateBlob(v8::SnapshotCreator::FunctionCodeHandling::kClear);
return snapshot_blob;
}
class StartupDataCppWriter {
public:
StartupDataCppWriter(const char* name, const char* filename,
const std::string& data)
: name_(name),
filename_(filename),
data_(data),
file_(filename_, std::ios::binary) {}
bool Write() {
if (file_.bad()) {
return false;
}
WritePrefix();
WriteData();
WriteSuffix();
file_.close();
// printf("Wrote %s %d %s \n", name_, data_.size(), filename_);
return !file_.bad();
}
private:
void WritePrefix() {
file_ << "// Autogenerated snapshot file. Do not edit.\n\n";
file_ << "#include \"third_party/v8/include/v8.h\"\n\n";
file_ << "namespace deno { \n\n";
}
void WriteSuffix() {
char buffer[500];
snprintf(buffer, sizeof(buffer), "v8::StartupData* StartupBlob_%s() {\n",
name_);
file_ << buffer;
snprintf(buffer, sizeof(buffer), " return &%s_blob;\n", name_);
file_ << buffer;
file_ << "}\n\n";
file_ << "} // namespace deno\n\n";
}
void WriteData() {
char buffer[500];
file_ << BinaryContentAsC(name_, data_);
snprintf(buffer, sizeof(buffer),
"static v8::StartupData %s_blob = { %s_data, %s_size };\n", name_,
name_, name_);
file_ << buffer;
}
const char* name_;
const char* filename_;
std::string data_;
std::ofstream file_;
};
} // namespace deno
int main(int argc, char** argv) {
const char* js_fn = argv[1];
const char* snapshot_out_cc = argv[2];
v8::V8::SetFlagsFromCommandLine(&argc, argv, true);
CHECK_EQ(argc, 3);
CHECK_NE(js_fn, nullptr);
CHECK_NE(snapshot_out_cc, nullptr);
std::string js_source;
CHECK(deno::ReadFileToString(js_fn, &js_source));
deno_init();
auto snapshot_blob = deno::MakeSnapshot(js_fn, js_source.c_str());
std::string snapshot_str(snapshot_blob.data, snapshot_blob.raw_size);
deno::StartupDataCppWriter writer("snapshot", snapshot_out_cc, snapshot_str);
CHECK(writer.Write());
}
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