Exception in Isolate::Scope's destructor

[Nikolas Kovacs]

Hi,

I am upgrading the version of v8 I am embedding into my program. I am having an issue that I cannot figure out how to solve. The issue is that, when building in debug mode, the Isolate::Scope object's destructor throws the following exception.

```
Exception thrown: read access violation.

this was 0x21000000001.
```

For reference, I am on Windows 10 and I am using clang-cl and libc++ that is built with v8.
The following is my build arguments for building v8 from source

```

is_debug = true

v8_enable_verify_heap = false

v8_enable_single_generation = false

v8_enable_shared_ro_heap = true

v8_enable_webassembly = true

v8_enable_maglev = true

v8_enable_turbofan = true

v8_enable_debug_code = true

v8_enable_debugging_features = true

v8_enable_direct_handle = false

v8_enable_direct_local = false

v8_enable_disassember = true

target_cpu = "x64"

enable_iterator_debugging = true

v8_enable_slow_dchecks = false

v8_use_external_startup_data = false

v8_enable_sandbox = true

v8_enable_pointer_compression = true

v8_enable_pointer_compression_shared_cage = true

v8_enable_31bit_smis_on_64bit_arch = true

```

Below is a reproducible example:

```cpp

#include <v8.h>

#include <libplatform/libplatform.h>

#include <memory>

int main() {

    std::unique_ptr<v8::Platform> platform = v8::platform::NewDefaultPlatform();

    v8::V8::InitializePlatform(platform.get());

    v8::V8::Initialize();

    v8::Isolate::CreateParams create_params;

    create_params.array_buffer_allocator = v8::ArrayBuffer::Allocator::NewDefaultAllocator();

    v8::Isolate* isolate = v8::Isolate::New(create_params);

    {

        v8::Isolate::Scope isolate_scope{ isolate };

        v8::HandleScope handle_scope{ isolate };

    }

    return 0;

}
```

[Nikolas Kovacs]

This is using v8 12.7.224.18 503eb7e9a50b0211f8db54ea362ea06ef56c940d, but I also experienced it with 12.8.374.11 57fb77ac624960f08296dbba8ef5b82ab5184287

[Ben Noordhuis]

You build V8 with is_debug=true so make sure your own code is also
compiled with -DV8_ENABLE_CHECKS, otherwise there will be an ABI
mismatch between your code and V8's.

(I have a todo to create a CL that detects that but I haven't gotten
around to it yet.)

[Nikolas Kovacs]

Much appreciated. This resolved my problem.