mirror of
https://github.com/denoland/deno
synced 2024-10-13 03:22:31 +00:00
76 lines
2.4 KiB
C++
76 lines
2.4 KiB
C++
// Copyright 2018 the Deno authors. All rights reserved. MIT license.
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// Hint: --trace_serializer is a useful debugging flag.
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#include <fstream>
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#include "deno.h"
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#include "file_util.h"
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#include "internal.h"
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#include "third_party/v8/include/v8.h"
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#include "third_party/v8/src/base/logging.h"
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namespace deno {
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v8::StartupData SerializeInternalFields(v8::Local<v8::Object> holder, int index,
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void* data) {
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DCHECK_EQ(data, nullptr);
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InternalFieldData* embedder_field = static_cast<InternalFieldData*>(
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holder->GetAlignedPointerFromInternalField(index));
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if (embedder_field == nullptr) return {nullptr, 0};
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int size = sizeof(*embedder_field);
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char* payload = new char[size];
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// We simply use memcpy to serialize the content.
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memcpy(payload, embedder_field, size);
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return {payload, size};
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}
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v8::StartupData MakeSnapshot(const char* js_filename,
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const std::string& js_source,
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const std::string* source_map) {
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auto* creator = new v8::SnapshotCreator(external_references);
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auto* isolate = creator->GetIsolate();
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v8::Isolate::Scope isolate_scope(isolate);
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{
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v8::HandleScope handle_scope(isolate);
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auto context = v8::Context::New(isolate);
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InitializeContext(isolate, context, js_filename, js_source, source_map);
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creator->SetDefaultContext(context, v8::SerializeInternalFieldsCallback(
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SerializeInternalFields, nullptr));
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}
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auto snapshot_blob =
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creator->CreateBlob(v8::SnapshotCreator::FunctionCodeHandling::kClear);
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return snapshot_blob;
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}
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} // namespace deno
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int main(int argc, char** argv) {
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const char* snapshot_out_bin = argv[1];
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const char* js_fn = argv[2];
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const char* source_map_fn = argv[3]; // Optional.
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v8::V8::SetFlagsFromCommandLine(&argc, argv, true);
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CHECK_NE(js_fn, nullptr);
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CHECK_NE(snapshot_out_bin, nullptr);
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std::string js_source;
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CHECK(deno::ReadFileToString(js_fn, &js_source));
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std::string source_map;
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if (source_map_fn != nullptr) {
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CHECK_EQ(argc, 4);
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CHECK(deno::ReadFileToString(source_map_fn, &source_map));
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}
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deno_init();
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auto snapshot_blob = deno::MakeSnapshot(
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js_fn, js_source, source_map_fn != nullptr ? &source_map : nullptr);
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std::string snapshot_str(snapshot_blob.data, snapshot_blob.raw_size);
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std::ofstream file_(snapshot_out_bin, std::ios::binary);
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file_ << snapshot_str;
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file_.close();
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return file_.bad();
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}
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