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// Copyright 2018 the Deno authors. 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 std::string& js_source,
const std::string* source_map) {
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, source_map);
creator->SetDefaultContext(context, v8::SerializeInternalFieldsCallback(
SerializeInternalFields, nullptr));
}
auto snapshot_blob =
creator->CreateBlob(v8::SnapshotCreator::FunctionCodeHandling::kClear);
return snapshot_blob;
}
} // namespace deno
int main(int argc, char** argv) {
const char* snapshot_out_bin = argv[1];
const char* js_fn = argv[2];
const char* source_map_fn = argv[3]; // Optional.
v8::V8::SetFlagsFromCommandLine(&argc, argv, true);
CHECK_NE(js_fn, nullptr);
CHECK_NE(snapshot_out_bin, nullptr);
std::string js_source;
CHECK(deno::ReadFileToString(js_fn, &js_source));
std::string source_map;
if (source_map_fn != nullptr) {
CHECK_EQ(argc, 4);
CHECK(deno::ReadFileToString(source_map_fn, &source_map));
}
deno_init();
auto snapshot_blob = deno::MakeSnapshot(
js_fn, js_source, source_map_fn != nullptr ? &source_map : nullptr);
std::string snapshot_str(snapshot_blob.data, snapshot_blob.raw_size);
std::ofstream file_(snapshot_out_bin, std::ios::binary);
file_ << snapshot_str;
file_.close();
return file_.bad();
}
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