Java Main如何被执行? - iceAeterna - 博客园



Java Main如何被执行? - iceAeterna - 博客园

Java Main如何被执行?

  java应用程序的启动在在/hotspot/src/share/tools/launcher/java.c的main()函数中,而在虚拟机初始化过程中,将创建并启动Java的Main线程。最后将调用JNIEnv的CallStaticVoidMethod()来执行main方法。

CallStaticVoidMethod()对应的jni函数为jni_CallStaticVoidMethod,定义在/hotspot/src/share/vm/prims/jni.cpp中,而jni_CallStaticVoidMethod()又调用了jni_invoke_static(),jni_invoke_static()通过JavaCalls的call()发起对Java方法的调用

  所有来自虚拟机对Java函数的调用最终都将由JavaCalls模块来完成,JavaCalls将通过call_helper()来执行Java方法并返回调用结果,并最终调用StubRoutines::call_stub()来执行Java方法


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