Hi, all, I am embedding v8 into a c++ program, and when trying to
initialize an Isolate again, the program crashes.
The way I was doing is made an v8::Isolate as a member field of an JsEngine
instance, then call ~JsEngine() and renew a JsEngine instance. In
~JsEngine(), I do stuff like disposed Isolate, shutdown platform, etc.
This can be reproduced by some modification to samples/hello-world.cc as
following:
int main(int argc, char* argv[]) {
>
> // Initialize V8.
>
> v8::V8::InitializeICUDefaultLocation(argv[0]);
>
> v8::V8::InitializeExternalStartupData(argv[0]);
>
> std::unique_ptr<v8::Platform> platform =
>> v8::platform::NewDefaultPlatform();
>
> v8::V8::InitializePlatform(platform.get());
>
> v8::V8::Initialize();
>
>
>> // Create a new Isolate and make it the current one.
>
> 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);
>
>
// -------------------------------------------------
> // ignore. evaluate some js strings here.
>
> // --------------------------------------------------
> // Dispose the isolate and tear down V8.
>
> isolate->Dispose();
>
> v8::V8::Dispose();
>
> v8::V8::ShutdownPlatform();
>
> delete create_params.array_buffer_allocator;
>
>
>> // --------------------------------------------------
> // do it again for testing
>
> // --------------------------------------------------
> v8::V8::InitializeICUDefaultLocation(argv[0]);
>
> v8::V8::InitializeExternalStartupData(argv[0]);
>
> std::unique_ptr<v8::Platform> platform2 =
>> v8::platform::NewDefaultPlatform();
>
> v8::V8::InitializePlatform(platform2.get());
>
> v8::V8::Initialize();
>
>
>> // Create a new Isolate and make it the current one.
>
> v8::Isolate::CreateParams create_params2;
>
> create_params2.array_buffer_allocator =
>
> v8::ArrayBuffer::Allocator::NewDefaultAllocator();
>
> v8::Isolate* isolate2 = v8::Isolate::New(create_params2); // crash here.
>
>
> return 0;
>
> }
>
> The output is like this:
> Hello, World!
>
> 3 + 4 = 7
>
> Segmentation fault (core dumped)
>
>
>
The backtrace looks like this:
>
#0 __GI___pthread_mutex_lock (mutex=0x128) at
> ../nptl/pthread_mutex_lock.c:67
#1 0x00000000007f2073 in
> v8::internal::wasm::WasmEngine::AddIsolate(v8::internal::Isolate*) ()
#2 0x00000000004cadd8 in
> v8::internal::Isolate::Init(v8::internal::ReadOnlyDeserializer*,
> v8::internal::StartupDeserializer*) ()
#3 0x00000000004cb2b9 in
> v8::internal::Isolate::InitWithSnapshot(v8::internal::ReadOnlyDeserializer*,
> v8::internal::StartupDeserializer*) ()
#4 0x00000000007d4735 in
> v8::internal::Snapshot::Initialize(v8::internal::Isolate*) ()
#5 0x000000000044abf2 in v8::Isolate::Initialize(v8::Isolate*,
> v8::Isolate::CreateParams const&) ()
#6 0x000000000044ad42 in v8::Isolate::New(v8::Isolate::CreateParams
> const&) ()
#7 0x0000000000414a4e in main ()
(gdb) q
Why this behavior will crash, and how to avoid this?
Any hints would be great, Thanks in advance!
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