re-add deprecated cppgc api (#1611)

.gn

@@ -40,6 +40,8 @@ default_args = {
 
   v8_enable_pointer_compression = false
 
+  v8_imminent_deprecation_warnings = false
+
   # This flag speeds up the performance of fork/execve on Linux systems for
   # embedders which use it (like Node.js). It works by marking the pages that
   # V8 allocates as MADV_DONTFORK. Without MADV_DONTFORK, the Linux kernel

src/binding.cc

@@ -3888,13 +3888,25 @@ void v8__Object__Wrap(v8::Isolate* isolate, const v8::Object& wrapper,
                    tag);
 }
 
+v8::CppHeap* v8__Isolate__GetCppHeap(v8::Isolate* isolate) {
+  return isolate->GetCppHeap();
+}
+
+void v8__Isolate__AttachCppHeap(v8::Isolate* isolate, v8::CppHeap* cpp_heap) {
+  isolate->AttachCppHeap(cpp_heap);
+}
+
+void v8__Isolate__DetachCppHeap(v8::Isolate* isolate) {
+  isolate->DetachCppHeap();
+}
+
 void cppgc__initialize_process(v8::Platform* platform) {
   cppgc::InitializeProcess(platform->GetPageAllocator());
 }
 
 void cppgc__shutdown_process() { cppgc::ShutdownProcess(); }
 
-v8::CppHeap* cppgc__heap__create(v8::Platform* platform,
+v8::CppHeap* v8__CppHeap__Create(v8::Platform* platform,
                                  cppgc::Heap::MarkingType marking_support,
                                  cppgc::Heap::SweepingType sweeping_support) {
   v8::CppHeapCreateParams params{{}};
@@ -3904,11 +3916,9 @@ v8::CppHeap* cppgc__heap__create(v8::Platform* platform,
   return heap.release();
 }
 
-v8::CppHeap* v8__Isolate__GetCppHeap(v8::Isolate* isolate) {
+void v8__CppHeap__Terminate(v8::CppHeap* cpp_heap) { cpp_heap->Terminate(); }
-  return isolate->GetCppHeap();
-}
 
-void cppgc__heap__DELETE(v8::CppHeap* self) { delete self; }
+void v8__CppHeap__DELETE(v8::CppHeap* self) { delete self; }
 
 void cppgc__heap__enable_detached_garbage_collections_for_testing(
     v8::CppHeap* heap) {

src/cppgc.rs

@@ -14,12 +14,13 @@ extern "C" {
   fn cppgc__initialize_process(platform: *mut Platform);
   fn cppgc__shutdown_process();
 
-  fn cppgc__heap__create(
+  fn v8__CppHeap__Create(
     platform: *mut Platform,
     marking_support: MarkingType,
     sweeping_support: SweepingType,
   ) -> *mut Heap;
-  fn cppgc__heap__DELETE(heap: *mut Heap);
+  fn v8__CppHeap__Terminate(heap: *mut Heap);
+  fn v8__CppHeap__DELETE(heap: *mut Heap);
   fn cppgc__make_garbage_collectable(
     heap: *mut Heap,
     size: usize,
@@ -226,7 +227,9 @@ pub struct Heap(Opaque);
 
 impl Drop for Heap {
   fn drop(&mut self) {
-    unsafe { cppgc__heap__DELETE(self) }
+    unsafe {
+      v8__CppHeap__DELETE(self);
+    }
   }
 }
 
@@ -236,7 +239,7 @@ impl Heap {
     params: HeapCreateParams,
   ) -> UniqueRef<Heap> {
     unsafe {
-      UniqueRef::from_raw(cppgc__heap__create(
+      UniqueRef::from_raw(v8__CppHeap__Create(
         &*platform as *const Platform as *mut _,
         params.marking_support,
         params.sweeping_support,
@@ -263,6 +266,12 @@ impl Heap {
       );
     }
   }
+
+  pub fn terminate(&mut self) {
+    unsafe {
+      v8__CppHeap__Terminate(self);
+    }
+  }
 }
 
 /// Base trait for managed objects.

src/isolate.rs

@@ -18,6 +18,7 @@ use crate::support::MapFnFrom;
 use crate::support::MapFnTo;
 use crate::support::Opaque;
 use crate::support::ToCFn;
+use crate::support::UniqueRef;
 use crate::support::UnitType;
 use crate::wasm::trampoline;
 use crate::wasm::WasmStreaming;
@@ -467,6 +468,8 @@ extern "C" {
     change_in_bytes: i64,
   ) -> i64;
   fn v8__Isolate__GetCppHeap(isolate: *mut Isolate) -> *mut Heap;
+  fn v8__Isolate__AttachCppHeap(isolate: *mut Isolate, cpp_heap: *mut Heap);
+  fn v8__Isolate__DetachCppHeap(isolate: *mut Isolate);
   fn v8__Isolate__SetPrepareStackTraceCallback(
     isolate: *mut Isolate,
     callback: PrepareStackTraceCallback,
@@ -1219,10 +1222,21 @@ impl Isolate {
     }
   }
 
+  #[inline(always)]
   pub fn get_cpp_heap(&mut self) -> Option<&Heap> {
     unsafe { v8__Isolate__GetCppHeap(self).as_ref() }
   }
 
+  #[inline(always)]
+  pub fn attach_cpp_heap(&mut self, cpp_heap: &mut UniqueRef<Heap>) {
+    unsafe { v8__Isolate__AttachCppHeap(self, cpp_heap.deref_mut()) }
+  }
+
+  #[inline(always)]
+  pub fn detach_cpp_heap(&mut self) {
+    unsafe { v8__Isolate__DetachCppHeap(self) }
+  }
+
   #[inline(always)]
   pub fn set_oom_error_handler(&mut self, callback: OomErrorCallback) {
     unsafe { v8__Isolate__SetOOMErrorHandler(self, callback) };

tests/test_cppgc.rs

@@ -94,13 +94,14 @@ fn cppgc_object_wrap() {
 
   {
     // Create a managed heap.
-    let heap = v8::cppgc::Heap::create(
+    let mut heap = v8::cppgc::Heap::create(
       guard.platform.clone(),
       v8::cppgc::HeapCreateParams::default(),
     );
-    let isolate =
+    let isolate = &mut v8::Isolate::new(v8::CreateParams::default());
-      &mut v8::Isolate::new(v8::CreateParams::default().cpp_heap(heap));
+    isolate.attach_cpp_heap(&mut heap);
 
+    {
       let handle_scope = &mut v8::HandleScope::new(isolate);
       let context = v8::Context::new(handle_scope, Default::default());
       let scope = &mut v8::ContextScope::new(handle_scope, context);
@@ -133,8 +134,9 @@ fn cppgc_object_wrap() {
 
       assert_eq!(DROP_COUNT.load(Ordering::SeqCst), 0);
 
-    scope
+      scope.request_garbage_collection_for_testing(
-      .request_garbage_collection_for_testing(v8::GarbageCollectionType::Full);
+        v8::GarbageCollectionType::Full,
+      );
 
       assert!(TRACE_COUNT.load(Ordering::SeqCst) > 0);
       assert_eq!(DROP_COUNT.load(Ordering::SeqCst), 1);
@@ -146,11 +148,17 @@ fn cppgc_object_wrap() {
     "#,
       );
 
-    scope
+      scope.request_garbage_collection_for_testing(
-      .request_garbage_collection_for_testing(v8::GarbageCollectionType::Full);
+        v8::GarbageCollectionType::Full,
+      );
 
       assert_eq!(DROP_COUNT.load(Ordering::SeqCst), 3);
     }
+
+    isolate.detach_cpp_heap();
+    heap.terminate();
+    drop(heap);
+  }
 }
 
 fn execute_script(