run_V8_from_snapshot.cpp

#include <stdlib.h>
#include <jni.h>
#include <libplatform/libplatform.h>
#include <v8.h>
//...
void runV8(JNIEnv *env, jobject instance, jobjectArray args) {
    const char *path_to_snapshot = "";// Get path from args
    const char *source_code = "";// Get source code from args
    v8::V8::InitializeICU();
    v8::V8::InitializeExternalStartupData(path_to_snapshot);
    std::unique_ptr<v8::Platform> platform = v8::platform::NewDefaultPlatform();
    v8::V8::InitializePlatform(platform.get());
    v8::V8::Initialize();

    v8::SnapshotCreator snapshot;
    v8::Isolate *isolate = snapshot.GetIsolate();
    {
        v8::Isolate::Scope isolate_scope(isolate);
        // Create a stack-allocated handle scope.
        v8::HandleScope handle_scope(isolate);
        // Create a new context.
        v8::Local<v8::Context> context = v8::Context::New(isolate);
        // Enter the context for compiling and running the script.
        v8::Context::Scope context_scope(context);
        // Create a string containing the JavaScript source code.
        v8::Local<v8::String> source = v8::String::NewFromUtf8(
                isolate, source_code, v8::NewStringType::kNormal).ToLocalChecked();
        // Compile the source code.
        v8::Local<v8::Script> script = v8::Script::Compile(
                context, source).ToLocalChecked();
        // Run the script to get the result.
        v8::Local<v8::Value> result = script->Run(context).ToLocalChecked();
        // Convert the result to an UTF8 string and print it.
        v8::String::Utf8Value utf8(isolate, result);

        printf("%s\n", *utf8);
        snapshot.SetDefaultContext(context);
    }

    v8::StartupData startupDataBlob = snapshot.CreateBlob(
            v8::SnapshotCreator::FunctionCodeHandling::kKeep);

    /*writeBinaryFile(
        "/path_to_write/snapshot.bin",
        startupDataBlob.raw_size,
        startupDataBlob.data);*/

    // Dispose the isolate and tear down V8.
    isolate->Dispose();
    v8::V8::Dispose();
    v8::V8::ShutdownPlatform();
}