Add thread operations and improve thread initialization logic

crates/core/src/objects/object_manager.rs

@@ -522,4 +522,54 @@ impl ObjectManager {
 		}
 		constructor_object
 	}
+
+	pub fn new_thread_group(
+		&mut self,
+		thread_group_class: Arc<RuntimeClass>,
+		name: ObjectReference,
+		max_priority: jint,
+	) -> ObjectReference {
+		let tg_object = self.new_object(thread_group_class);
+		{
+			let obj = tg_object.lock();
+			obj.set_field("name", name.into());
+			obj.set_field("maxPriority", max_priority.into());
+		}
+		tg_object
+	}
+	pub fn new_holder(
+		&mut self,
+		holder_class: Arc<RuntimeClass>,
+		group: ObjectReference,
+		priority: jint,
+		status: jint,
+	) -> ObjectReference {
+		let holder_object = self.new_object(holder_class);
+		{
+			let obj = holder_object.lock();
+			obj.set_field("group", group.into());
+			obj.set_field("priority", priority.into());
+			obj.set_field("threadStatus", status.into());
+		}
+		holder_object
+	}
+
+	pub fn new_thread(
+		&mut self,
+		thread_class: Arc<RuntimeClass>,
+		eetop: jlong,
+		tid: jlong,
+		name: ObjectReference,
+		holder: ObjectReference,
+	) -> ObjectReference {
+		let tg_object = self.new_object(thread_class);
+		{
+			let obj = tg_object.lock();
+			obj.set_field("eetop", eetop.into());
+			obj.set_field("tid", tid.into());
+			obj.set_field("name", name.into());
+			obj.set_field("holder", holder.into());
+		}
+		tg_object
+	}
 }

crates/core/src/thread.rs

@@ -22,8 +22,8 @@ use std::cell::RefCell;
 use std::collections::VecDeque;
 use std::ops::{Add, Deref};
 use std::ptr::null_mut;
-use std::sync::Arc;
 use std::sync::atomic::{AtomicU64, Ordering};
+use std::sync::{Arc, OnceLock};
 
 use std::thread;
 use std::vec::IntoIter;
@@ -46,12 +46,12 @@ pub struct VmThread {
 	pub frame_stack: Mutex<Vec<Frame>>,
 	pub gc: Arc<RwLock<ObjectManager>>,
 	pub jni_env: JNIEnv,
+	pub mirror: OnceLock<u32>,
 }
 
 impl VmThread {
 	pub fn new(vm: Arc<Vm>, loader: Option<LoaderRef>) -> Arc<Self> {
-		static NEXT_ID: AtomicU64 = AtomicU64::new(0);
-		let id = ThreadId(NEXT_ID.fetch_add(1, Ordering::SeqCst));
+		let id = ThreadId(vm.NEXT_ID.fetch_add(1, Ordering::SeqCst));
 
 		let loader = loader.unwrap_or(vm.loader.clone());
 		let gc = vm.gc.clone();
@@ -64,6 +64,7 @@ impl VmThread {
 				frame_stack: Default::default(),
 				gc,
 				jni_env,
+				mirror: Default::default(),
 			}
 		})
 	}
@@ -286,7 +287,7 @@ impl VmThread {
 	}
 
 	pub fn invoke(&self, method_reference: MethodRef, args: Vec<Value>) -> MethodCallResult {
-		if self.gc.read().objects.len() > 2230 {
+		if self.gc.read().objects.len() > 2235 {
 			INIT_LOGGER.call_once(|| {
 				env_logger::Builder::from_default_env()
 					.filter_level(LevelFilter::Trace)
@@ -320,9 +321,9 @@ impl VmThread {
 	pub fn invoke_native(&self, method: &MethodRef, mut args: Vec<Value>) -> MethodCallResult {
 		let symbol_name = generate_jni_method_name(method, false);
 
-		if symbol_name.contains("Java_jdk_internal_misc_Signal_handle0") {
+		if symbol_name.contains("Java_jdk_internal_misc_Unsafe_getLongVolatile") {
 			return Err(VmError::Debug(
-				"RoastVM specific implementation required for Java_jdk_internal_misc_Signal_handle0",
+				"RoastVM specific implementation required for Java_jdk_internal_misc_Unsafe_getLongVolatile",
 			));
 		}
 
@@ -601,4 +602,26 @@ impl VmThread {
 		gc.get_interned_string(utf)
 			.unwrap_or_else(|| gc.new_string(byte_array_class, string_class, utf))
 	}
+
+	pub fn bootstrap_mirror(&self) {
+		let thread_id = self.id.0 as jlong;
+		let main = self.intern_string("main");
+		let system = self.intern_string("system");
+		let thread_klass = self.get_class("java/lang/Thread").unwrap();
+		let thread_group_klass = self.get_class("java/lang/ThreadGroup").unwrap();
+		let field_holder_klass = self.get_class("java/lang/Thread$FieldHolder").unwrap();
+		let group = self
+			.gc
+			.write()
+			.new_thread_group(thread_group_klass, system, 10 as jint);
+		let holder = self
+			.gc
+			.write()
+			.new_holder(field_holder_klass, group, 5 as jint, 5 as jint);
+		let thread = self
+			.gc
+			.write()
+			.new_thread(thread_klass, thread_id, thread_id, main, holder);
+		self.mirror.set(thread.lock().id).unwrap();
+	}
 }

crates/core/src/vm.rs

@@ -21,6 +21,7 @@ use imp::Library;
 use log::trace;
 use parking_lot::{Mutex, RwLock};
 use std::sync::Arc;
+use std::sync::atomic::AtomicU64;
 
 type NativeLibraries = Arc<RwLock<Vec<(String, Library)>>>;
 
@@ -34,6 +35,7 @@ pub struct Vm {
 	pub native_libraries: NativeLibraries,
 	pub gc: Arc<RwLock<ObjectManager>>,
 	pub safent: RwLock<UnsafeSupport>,
+	pub NEXT_ID: AtomicU64,
 }
 
 impl Vm {
@@ -47,6 +49,7 @@ impl Vm {
 			native_libraries: Arc::new(RwLock::new(Vec::new())),
 			gc: Default::default(),
 			safent: Default::default(),
+			NEXT_ID: AtomicU64::new(0),
 		});
 
 		// Create main thread
@@ -160,6 +163,10 @@ impl Vm {
 			name: "initPhase1".to_string(),
 			desc: MethodDescriptor::void(),
 		};
+		self.threads
+			.get(&self.main_thread_id)
+			.unwrap()
+			.bootstrap_mirror();
 		thread.invoke(phase1ref, Vec::new())?;
 		panic!("HOLY FUCKING SHIT, DID WE PHASE 1!?");
 		Ok(())

crates/roast-vm-sys/src/lib.rs

@@ -2,12 +2,14 @@
 
 mod CDS;
 mod class;
-mod memaccess;
 mod misc_unsafe;
 mod object;
 mod reflection;
 mod runtime;
+mod scoped_memory_access;
+mod signal;
 mod system;
+mod thread;
 
 use jni::objects::{JClass, JObject, JString};
 use jni::strings::JNIString;

crates/roast-vm-sys/src/misc_unsafe.rs

@@ -571,3 +571,42 @@ pub unsafe extern "system" fn Java_jdk_internal_misc_Unsafe_fullFence(
 ) {
 	std::sync::atomic::fence(std::sync::atomic::Ordering::SeqCst);
 }
+
+#[unsafe(no_mangle)]
+pub unsafe extern "system" fn Java_jdk_internal_misc_Unsafe_getLongVolatile(
+	env: *mut JNIEnv,
+	_unsafe_obj: jobject,
+	obj: jobject,
+	offset: jlong,
+) -> jlong {
+	let thread = &*get_thread(env);
+	let reference = thread.gc.read().get(obj as u32);
+
+	match reference {
+		ReferenceKind::ArrayReference(array_ref) => {
+			if let ArrayReference::Long(arr) = array_ref {
+				let guard = arr.lock();
+				let index = (offset / 8) as usize;
+				guard.backing[index]
+			} else {
+				panic!("getLongVolatile on non-long array")
+			}
+		}
+		ReferenceKind::ObjectReference(obj_ref) => {
+			let key = thread
+				.vm
+				.safent
+				.read()
+				.resolve_field(offset)
+				.expect("unregistered field offset");
+			let guard = obj_ref.lock();
+			guard
+				.fields
+				.get(&key.field_name)
+				.unwrap()
+				.clone()
+				.try_into_jlong()
+				.unwrap()
+		}
+	}
+}

crates/roast-vm-sys/src/signal.rs

@@ -0,0 +1,11 @@
+use jni::sys::{JNIEnv, jclass, jint, jlong};
+#[unsafe(no_mangle)]
+unsafe extern "system" fn Java_jdk_internal_misc_Signal_handle0(
+	_env: *mut JNIEnv,
+	_cls: jclass,
+	_sig: jint,
+	_handler: jlong,
+) -> jlong {
+	// Return 0 (SIG_DFL) - pretend no previous handler existed
+	0
+}

crates/roast-vm-sys/src/thread.rs

@@ -0,0 +1,22 @@
+use crate::get_thread;
+use jni::sys::{JNIEnv, jclass, jint, jlong, jobject};
+use std::sync::atomic::Ordering;
+
+#[unsafe(no_mangle)]
+unsafe extern "system" fn Java_java_lang_Thread_currentThread(
+	env: *mut JNIEnv,
+	_cls: jclass,
+) -> jobject {
+	let thread = &*get_thread(env);
+	let thread_id_obj = thread.mirror.get().unwrap();
+	*thread_id_obj as jobject
+}
+
+#[unsafe(no_mangle)]
+unsafe extern "system" fn Java_java_lang_Thread_getNextThreadIdOffset(
+	env: *mut JNIEnv,
+	_cls: jclass,
+) -> jlong {
+	let thread = &*get_thread(env);
+	thread.vm.NEXT_ID.fetch_add(1, Ordering::Relaxed) as jlong
+}