Expose more GC-triggering API to the C part

In addition to `mmtk_{disable,enable}_collection`, we also expose an API
`mmtk_is_collection_enabled` for the Ruby runtime to implement
`GC.disable` and `GC.enable`.

We also expose the `force` and `exhaustive` parameters of
`MMTK::handle_user_collection_request` to the C part so that `GC.start`
can force a GC even when the user disabled GC.

Author: wks

mmtk/Cargo.toml

@@ -12,7 +12,7 @@ edition = "2021"
 # Metadata for the Ruby repository
 [package.metadata.ci-repos.ruby]
 repo = "mmtk/ruby" # This is used by actions/checkout, so the format is "owner/repo", not URL.
-rev = "9bb8f4b0393c5f942e1d486b227eafc60e9c8219"
+rev = "e390bc74f4540ddbf7408cb0a6430051eeed407c"
 
 [lib]
 name = "mmtk_ruby"

mmtk/src/api.rs

@@ -203,6 +203,11 @@ pub extern "C" fn mmtk_disable_collection() {
     BINDING_FAST.gc_enabled.store(false, Ordering::Relaxed);
 }
 
+#[no_mangle]
+pub extern "C" fn mmtk_is_collection_enabled() -> bool {
+    BINDING_FAST.gc_enabled.load(Ordering::Relaxed)
+}
+
 #[no_mangle]
 pub extern "C" fn mmtk_plan_name() -> *const libc::c_char {
     crate::binding().get_plan_name_c()
@@ -246,8 +251,12 @@ pub extern "C" fn mmtk_is_mmtk_object(addr: Address) -> bool {
 }
 
 #[no_mangle]
-pub extern "C" fn mmtk_handle_user_collection_request(tls: VMMutatorThread) {
-    memory_manager::handle_user_collection_request::<Ruby>(mmtk(), tls);
+pub extern "C" fn mmtk_handle_user_collection_request(
+    tls: VMMutatorThread,
+    force: bool,
+    exhaustive: bool,
+) {
+    crate::mmtk().handle_user_collection_request(tls, force, exhaustive);
 }
 
 #[no_mangle]