Add simple java.lang.Thread.currentThread native implementation

fernandezseb · Jan 27, 2024 · e1f18ff · e1f18ff
1 parent c705569
commit e1f18ff
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Showing 4 changed files with 18 additions and 1 deletion.
diff --git a/src/Library/java/lang/Thread.cpp b/src/Library/java/lang/Thread.cpp
@@ -17,5 +17,15 @@
 
 JCALL void lib_java_lang_Thread_registerNatives(NATIVE_ARGS)
 {
+    registerNative("java/lang/Thread/currentThread", "()Ljava/lang/Thread;", lib_java_lang_Thread_currentThread);
+}
+
+JCALL void lib_java_lang_Thread_currentThread(NATIVE_ARGS)
+{
+    // TODO: Maybe check if an object was already created?
+    ClassInfo* threadClass = VM->getClass("java/lang/Thread", thread);
+    const u4 objectReference = heap->createObject(threadClass, VM);
+    StackFrame* returnFrame = thread->getTopFrameNonNative();
+    returnFrame->pushObject(objectReference);
 }
 
diff --git a/src/Library/java/lang/Thread.h b/src/Library/java/lang/Thread.h
@@ -2,4 +2,5 @@
 
 #include "Library/NativeDefs.h"
 
-JCALL void lib_java_lang_Thread_registerNatives(NATIVE_ARGS);
+JCALL void lib_java_lang_Thread_registerNatives(NATIVE_ARGS);
+JCALL void lib_java_lang_Thread_currentThread(NATIVE_ARGS);
diff --git a/src/VM/JavaStack.h b/src/VM/JavaStack.h
@@ -79,6 +79,11 @@ struct StackFrame {
         operands.emplace_back(VariableType_FLOAT, std::bit_cast<u4>(value));
     }
 
+    void pushObject(const u4 objectRef)
+    {
+        operands.emplace_back(VariableType_REFERENCE, objectRef);
+    }
+
     [[nodiscard]] Variable peekOperand() const
     {
         return operands.back();

diff --git a/src/VM/VM.cpp b/src/VM/VM.cpp
@@ -40,6 +40,7 @@ void VM::start()
     getClass("java/lang/Class", &m_mainThread);
     getClass("java/lang/String", &m_mainThread);
     getClass("java/lang/System", &m_mainThread);
+    getClass("java/lang/Thread", &m_mainThread);
 }
 
 std::vector<Variable> VM::createVariableForDescriptor(const char* descriptor)