x-context.cpp

#include <string.h>
#include <stdlib.h>

#include "include/libplatform/libplatform.h"
#include "include/v8.h"

using namespace v8;

class ArrayBufferAllocator : public v8::ArrayBuffer::Allocator {
 public:
  inline virtual void* Allocate(size_t length) override {
    void* data = AllocateUninitialized(length);
    return data == NULL ? data : memset(data, 0, length);
  }
  inline virtual void* AllocateUninitialized(size_t length) override { return malloc(length); }
  inline virtual void Free(void* data, size_t) override { free(data); }
};



int main(int argc, char ** argv)
{
      v8::V8::InitializeICU();
      auto platform = v8::platform::CreateDefaultPlatform();
      v8::V8::InitializePlatform(platform);
      v8::V8::Initialize();

      v8::Isolate::CreateParams create_params;
      create_params.array_buffer_allocator = (v8::ArrayBuffer::Allocator *) new ArrayBufferAllocator();

      auto i = v8::Isolate::New(create_params);

      {
	v8::Isolate::Scope is(i);
	v8::HandleScope hs(i);
	auto got = v8::ObjectTemplate::New(i);


	auto c = v8::Context::New(i, nullptr, got);
	{
	  v8::Context::Scope cs(c);
	  auto s = v8::Script::Compile(c, v8::String::NewFromUtf8(i,"a=function(){return b;}")).ToLocalChecked();
	  
	  (void)s->Run(c);	
	}

// THIS WORKS
	//(void)c->Global()->Set(c,String::NewFromUtf8(i,"b"), String::NewFromUtf8(i,"HELLO"));
	//auto a_val = c->Global()->Get(c, String::NewFromUtf8(i,"a")).ToLocalChecked();
	//auto a_func = Local<Function>::Cast(a_val);
	//auto result = a_func->Call(c, c->Global(), 0, nullptr);
	//printf("result: %s\n", *String::Utf8Value(result.ToLocalChecked()));


	

	auto c2 = v8::Context::New(i, nullptr, got);
	{
	  Context::Scope cs2(c2);
	  (void)c2->Global()->Set(c2,String::NewFromUtf8(i,"b"), String::NewFromUtf8(i,"HELLO"));
	  auto a_val2 = c2->Global()->Get(c, String::NewFromUtf8(i,"a")).ToLocalChecked();
	  auto a_func2 = Local<Function>::Cast(a_val2);
	  auto result2 = a_func2->Call(c2, c2->Global(), 0, nullptr);
	  printf("result: %s\n", *String::Utf8Value(result2.ToLocalChecked()));
	}
      }
}