jvm源码解读--10 enum WKID 枚举
源码中对于枚举类型WKID的使用
static bool initialize_wk_klass(WKID id, int init_opt, TRAPS); static void initialize_wk_klasses_until(WKID limit_id, WKID &start_id, TRAPS); static void initialize_wk_klasses_through(WKID end_id, WKID &start_id, TRAPS) { int limit = (int)end_id + 1; initialize_wk_klasses_until((WKID) limit, start_id, THREAD);
这个是宏定义,类似于以下简码
int main() { enum EM{ day1,b1=day1, day2,b2=day2, }; std::cout << "day2的值为:" << std::endl; std::cout << EM::day2 << std::endl; std::cout << "b1 的值为:" << std::endl; std::cout << EM::b1 << std::endl; return 0; } 打印结果 day2的值为: 1 b1 的值为: 0
能看出来,这个枚举非常特殊,
那么看WKID
enum WKID { NO_WKID = 0, /* well-known classes */ Object_klass_knum, java_lang_Object_knum = Object_klass_knum, String_klass_knum, java_lang_String_knum = String_klass_knum, Class_klass_knum, java_lang_Class_knum = Class_klass_knum, Cloneable_klass_knum, java_lang_Cloneable_knum = Cloneable_klass_knum, ClassLoader_klass_knum, java_lang_ClassLoader_knum = Cloneable_klass_knum, Serializable_klass_knum, java_io_Serializable_knum = Serializable_klass_knum, System_klass_knum, java_lang_System_knum = System_klass_knum, Throwable_klass_knum, java_lang_Throwable_knum = Throwable_klass_knum, Error_klass_knum, java_lang_Error_knum = Error_klass_knum, ThreadDeath_klass_knum, java_lang_ThreadDeath_knum = ThreadDeath_klass_knum, Exception_klass_knum, java_lang_Exception_knum = Exception_klass_knum,, RuntimeException_klass_knum, java_lang_RuntimeException_knum = RuntimeException_klass_knum, SecurityManager_klass_knum, java_lang_SecurityManager_knum = SecurityManager_klass_knum, ProtectionDomain_klass_knum, java_security_ProtectionDomain_knum = ProtectionDomain_klass_knum, AccessControlContext_klass_knum, java_security_AccessControlContext_knum = AccessControlContext_klass_knum, ClassNotFoundException_klass_knum, java_lang_ClassNotFoundException_knum = ClassNotFoundException_klass_knum, NoClassDefFoundError_klass_knum, java_lang_NoClassDefFoundError_knum = NoClassDefFoundError_klass_knum, LinkageError_klass_knum, java_lang_LinkageError_knum = LinkageError_klass_knum, ClassCastException_klass_knum, java_lang_ClassCastException_knum = ClassCastException_klass_knum, ArrayStoreException_klass_knum, java_lang_ArrayStoreException_knum = ArrayStoreException_klass_knum, VirtualMachineError_klass_knum, java_lang_VirtualMachineError_knum = VirtualMachineError_klass_knum, OutOfMemoryError_klass_knum, java_lang_OutOfMemoryError_knum = OutOfMemoryError_klass_knum, StackOverflowError_klass_knum, java_lang_StackOverflowError_knum = StackOverflowError_klass_knum, IllegalMonitorStateException_klass_knum, java_lang_IllegalMonitorStateException_knum = IllegalMonitorStateException_klass_knum, Reference_klass_knum, java_lang_ref_Reference_knum = Reference_klass_knum, /* load ref klasses and set reference types */ SoftReference_klass_knum, java_lang_ref_SoftReference_knum = SoftReference_klass_knum, WeakReference_klass_knum, java_lang_ref_WeakReference_knum = WeakReference_klass_knum, FinalReference_klass_knum, java_lang_ref_FinalReference_knum = FinalReference_klass_knum, PhantomReference_klass_knum, java_lang_ref_PhantomReference_knum = PhantomReference_klass_knum, Finalizer_klass_knum, java_lang_ref_Finalizer_knum = Finalizer_klass_knum, Thread_klass_knum, java_lang_Thread_knum = Thread_klass_knum, ThreadGroup_klass_knum, java_lang_ThreadGroup_knum = ThreadGroup_klass_knum, Properties_klass_knum, java_util_Properties_knum = Properties_klass_knum, reflect_AccessibleObject_klass_knum, java_lang_reflect_AccessibleObject_knum = reflect_AccessibleObject_klass_knum, reflect_Field_klass_knum, java_lang_reflect_Field_knum = reflect_Field_klass_knum, reflect_Parameter_klass_knum, java_lang_reflect_Parameter_knum = reflect_Parameter_klass_knum, reflect_Method_klass_knum, java_lang_reflect_Method_knum = reflect_Method_klass_knum, reflect_Constructor_klass_knum, java_lang_reflect_Constructor_knum = reflect_Constructor_klass_knum, /* NOTE: needed too early in bootstrapping process to have checks based on JDK version */ /* Universe::is_gte_jdk14x_version( is not set up by this point. */ /* It's okay if this turns out to be NULL in non-1.4 JDKs. */ reflect_MagicAccessorImpl_klass_knum, sun_reflect_MagicAccessorImpl_knum = reflect_MagicAccessorImpl_klass_knum, reflect_MethodAccessorImpl_klass_knum, sun_reflect_MethodAccessorImpl_knum = reflect_MethodAccessorImpl_klass_knum, reflect_ConstructorAccessorImpl_klass_knum, sun_reflect_ConstructorAccessorImpl_knum = reflect_ConstructorAccessorImpl_klass_knum, reflect_DelegatingClassLoader_klass_knum, sun_reflect_DelegatingClassLoader_knum = reflect_DelegatingClassLoader_klass_knum, reflect_ConstantPool_klass_knum, sun_reflect_ConstantPool_knum = reflect_ConstantPool_klass_knum, reflect_UnsafeStaticFieldAccessorImpl_klass_knum, sun_reflect_UnsafeStaticFieldAccessorImpl_knum = reflect_UnsafeStaticFieldAccessorImpl_klass_knum, reflect_CallerSensitive_klass_knum, sun_reflect_CallerSensitive_knum = reflect_CallerSensitive_klass_knum, /* support for dynamic typing; it's OK if these are NULL in earlier JDKs */ DirectMethodHandle_klass_knum, java_lang_invoke_DirectMethodHandle_knum = DirectMethodHandle_klass_knum, MethodHandle_klass_knum, java_lang_invoke_MethodHandle_knum = MethodHandle_klass_knum, MemberName_klass_knum, java_lang_invoke_MemberName_knum = MemberName_klass_knum, MethodHandleNatives_klass_knum, java_lang_invoke_MethodHandleNatives_knum = MethodHandleNatives_klass_knum, LambdaForm_klass_knum, java_lang_invoke_LambdaForm_knum = LambdaForm_klass_knum, MethodType_klass_knum, java_lang_invoke_MethodType_knum = MethodType_klass_knum, BootstrapMethodError_klass_knum, java_lang_BootstrapMethodError_knum = BootstrapMethodError_klass_knum, CallSite_klass_knum, java_lang_invoke_CallSite_knum = CallSite_klass_knum, ConstantCallSite_klass_knum, java_lang_invoke_ConstantCallSite_knum = ConstantCallSite_klass_knum, MutableCallSite_klass_knum, java_lang_invoke_MutableCallSite_knum = MutableCallSite_klass_knum, VolatileCallSite_klass_knum, java_lang_invoke_VolatileCallSite_knum = VolatileCallSite_klass_knum, /* Note: MethodHandle must be first, and VolatileCallSite last in group */ StringBuffer_klass_knum, java_lang_StringBuffer_knum = StringBuffer_klass_knum, StringBuilder_klass_knum, java_lang_StringBuilder_knum = StringBuilder_klass_knum, misc_Unsafe_klass_knum, sun_misc_Unsafe_knum = misc_Unsafe_klass_knum, /* It's NULL in non-1.4 JDKs. */ StackTraceElement_klass_knum, java_lang_StackTraceElement_knum = StackTraceElement_klass_knum, /* Universe::is_gte_jdk14x_version( is not set up by this point. */ /* It's okay if this turns out to be NULL in non-1.4 JDKs. */ nio_Buffer_klass_knum, java_nio_Buffer_knum = nio_Buffer_klass_knum, /* load boxing klasses */ Boolean_klass_knum, java_lang_Boolean_knum = Boolean_klass_knum, Character_klass_knum, java_lang_Character_knum = Character_klass_knum, Float_klass_knum, java_lang_Float_knum = Float_klass_knum, Double_klass_knum, java_lang_Double_knum = Double_klass_knum, Byte_klass_knum, java_lang_Byte_knum = Byte_klass_knum, Short_klass_knum, java_lang_Short_knum = Short_klass_knum, Integer_klass_knum, java_lang_Integer_knum = Integer_klass_knum, Long_klass_knum, java_lang_Long_knum = Long_klass_knum, //68 /*end*/ WKID_LIMIT, //69 FIRST_WKID = NO_WKID + 1 };
这个宏是之前是看不懂的,今天顺利的解决了,通过clion的replace R 功能,替换,先将代码写道一个cpp文件中,全部替换就行了
public: enum WKID { NO_WKID = 0, #define WK_KLASS_ENUM(name, symbol, ignore_o) WK_KLASS_ENUM_NAME(name), WK_KLASS_ENUM_NAME(symbol) = WK_KLASS_ENUM_NAME(name), WK_KLASSES_DO(WK_KLASS_ENUM) #undef WK_KLASS_ENUM WKID_LIMIT, FIRST_WKID = NO_WKID + 1 };
这里非常重要的是
#define WK_KLASS_ENUM(name, symbol, ignore_o) WK_KLASS_ENUM_NAME(name), WK_KLASS_ENUM_NAME(symbol) = WK_KLASS_ENUM_NAME(name),
//
这个一行看成两部分,用 空格作为区分
