#ifdef JAVAW

char **__initenv;

int WINAPI
WinMain(HINSTANCE inst, HINSTANCE previnst, LPSTR cmdline, int cmdshow)
{
    int margc;
    char** margv;
    const jboolean const_javaw = JNI_TRUE;

    __initenv = _environ;

#else /* JAVAW */
int
main(int argc, char **argv)
{
    int margc;
    char** margv;
    const jboolean const_javaw = JNI_FALSE;
#endif /* JAVAW */
#ifdef _WIN32
    {
        int i = 0;
        if (getenv(JLDEBUG_ENV_ENTRY) != NULL) {
            printf("Windows original main args:\n");
            for (i = 0 ; i < __argc ; i++) {
                printf("wwwd_args[%d] = %s\n", i, __argv[i]);
            }
        }
    }
    JLI_CmdToArgs(GetCommandLine());
    margc = JLI_GetStdArgc();
    // add one more to mark the end
    margv = (char **)JLI_MemAlloc((margc + 1) * (sizeof(char *)));
    {
        int i = 0;
        StdArg *stdargs = JLI_GetStdArgs();
        for (i = 0 ; i < margc ; i++) {
            margv[i] = stdargs[i].arg;
        }
        margv[i] = NULL;
    }
#else /* *NIXES */
    margc = argc;
    margv = argv;
#endif /* WIN32 */
    return JLI_Launch(margc, margv,
                   sizeof(const_jargs) / sizeof(char *), const_jargs,
                   sizeof(const_appclasspath) / sizeof(char *), const_appclasspath,
                   FULL_VERSION,
                   DOT_VERSION,
                   (const_progname != NULL) ? const_progname : *margv,
                   (const_launcher != NULL) ? const_launcher : *margv,
                   (const_jargs != NULL) ? JNI_TRUE : JNI_FALSE,
                   const_cpwildcard, const_javaw, const_ergo_class);
}

/*
 * Entry point.
 */
int
JLI_Launch(int argc, char ** argv,              /* main argc, argc */
        int jargc, const char** jargv,          /* java args */
        int appclassc, const char** appclassv,  /* app classpath */
        const char* fullversion,                /* full version defined */
        const char* dotversion,                 /* dot version defined */
        const char* pname,                      /* program name */
        const char* lname,                      /* launcher name */
        jboolean javaargs,                      /* JAVA_ARGS */
        jboolean cpwildcard,                    /* classpath wildcard*/
        jboolean javaw,                         /* windows-only javaw */
        jint ergo                               /* ergonomics class policy */
)
{
    ......

    /*
     * Make sure the specified version of the JRE is running.
     *
     * There are three things to note about the SelectVersion() routine:
     *  1) If the version running isn't correct, this routine doesn't
     *     return (either the correct version has been exec'd or an error
     *     was issued).
     *  2) Argc and Argv in this scope are *not* altered by this routine.
     *     It is the responsibility of subsequent code to ignore the
     *     arguments handled by this routine.
     *  3) As a side-effect, the variable "main_class" is guaranteed to
     *     be set (if it should ever be set).  This isn't exactly the
     *     poster child for structured programming, but it is a small
     *     price to pay for not processing a jar file operand twice.
     *     (Note: This side effect has been disabled.  See comment on
     *     bugid 5030265 below.)
     */
    // 选择jre版本
    // 查找main_class
    SelectVersion(argc, argv, &main_class);

    // 解析jrepath, jvmpath, jvmcfg
    CreateExecutionEnvironment(&argc, &argv,
                               jrepath, sizeof(jrepath),
                               jvmpath, sizeof(jvmpath),
                               jvmcfg,  sizeof(jvmcfg));

    ifn.CreateJavaVM = 0;
    ifn.GetDefaultJavaVMInitArgs = 0;

    ......

    // 加载虚拟机函数
    if (!LoadJavaVM(jvmpath, &ifn)) {
        return(6);
    }
    
    ......

    JLI_TraceLauncher("%ld micro seconds to LoadJavaVM\n",
             (long)(jint)Counter2Micros(end-start));

    ++argv;
    --argc;

    if (IsJavaArgs()) {
        /* Preprocess wrapper arguments */
        TranslateApplicationArgs(jargc, jargv, &argc, &argv);
        if (!AddApplicationOptions(appclassc, appclassv)) {
            return(1);
        }
    } else {
        /* Set default CLASSPATH */
        cpath = getenv("CLASSPATH");
        if (cpath == NULL) {
            cpath = ".";
        }
        SetClassPath(cpath);
    }

    /* Parse command line options; if the return value of
     * ParseArguments is false, the program should exit.
     */
    // 参数初始化
    if (!ParseArguments(&argc, &argv, &mode, &what, &ret, jrepath))
    {
        return(ret);
    }

    /* Override class path if -jar flag was specified */
    if (mode == LM_JAR) {
        SetClassPath(what);     /* Override class path */
    }

    /* set the -Dsun.java.command pseudo property */
    SetJavaCommandLineProp(what, argc, argv);

    /* Set the -Dsun.java.launcher pseudo property */
    SetJavaLauncherProp();

    /* set the -Dsun.java.launcher.* platform properties */
    SetJavaLauncherPlatformProps();

    // 虚拟机初始化
    return JVMInit(&ifn, threadStackSize, argc, argv, mode, what, ret);
}

static jboolean
GetJREPath(char *path, jint pathsize, const char * arch, jboolean speculative)
{
    char libjava[MAXPATHLEN];

    if (GetApplicationHome(path, pathsize)) {
        /* Is JRE co-located with the application? */
        JLI_Snprintf(libjava, sizeof(libjava), "%s/lib/%s/" JAVA_DLL, path, arch);
        if (access(libjava, F_OK) == 0) {
            JLI_TraceLauncher("JRE path is %s\n", path);
            return JNI_TRUE;
        }

        /* Does the app ship a private JRE in <apphome>/jre directory? */
        JLI_Snprintf(libjava, sizeof(libjava), "%s/jre/lib/%s/" JAVA_DLL, path, arch);
        if (access(libjava, F_OK) == 0) {
            JLI_StrCat(path, "/jre");
            JLI_TraceLauncher("JRE path is %s\n", path);
            return JNI_TRUE;
        }
    }

    if (!speculative)
      JLI_ReportErrorMessage(JRE_ERROR8 JAVA_DLL);
    return JNI_FALSE;
}

jboolean
LoadJavaVM(const char *jvmpath, InvocationFunctions *ifn)
{
    void *libjvm;

    JLI_TraceLauncher("JVM path is %s\n", jvmpath);

    libjvm = dlopen(jvmpath, RTLD_NOW + RTLD_GLOBAL);
    if (libjvm == NULL) {
#if defined(__solaris__) && defined(__sparc) && !defined(_LP64) /* i.e. 32-bit sparc */
      FILE * fp;
      Elf32_Ehdr elf_head;
      int count;
      int location;

      fp = fopen(jvmpath, "r");
      if (fp == NULL) {
        JLI_ReportErrorMessage(DLL_ERROR2, jvmpath, dlerror());
        return JNI_FALSE;
      }

      /* read in elf header */
      count = fread((void*)(&elf_head), sizeof(Elf32_Ehdr), 1, fp);
      fclose(fp);
      if (count < 1) {
        JLI_ReportErrorMessage(DLL_ERROR2, jvmpath, dlerror());
        return JNI_FALSE;
      }

      /*
       * Check for running a server vm (compiled with -xarch=v8plus)
       * on a stock v8 processor.  In this case, the machine type in
       * the elf header would not be included the architecture list
       * provided by the isalist command, which is turn is gotten from
       * sysinfo.  This case cannot occur on 64-bit hardware and thus
       * does not have to be checked for in binaries with an LP64 data
       * model.
       */
      if (elf_head.e_machine == EM_SPARC32PLUS) {
        char buf[257];  /* recommended buffer size from sysinfo man
                           page */
        long length;
        char* location;

        length = sysinfo(SI_ISALIST, buf, 257);
        if (length > 0) {
            location = JLI_StrStr(buf, "sparcv8plus ");
          if (location == NULL) {
            JLI_ReportErrorMessage(JVM_ERROR3);
            return JNI_FALSE;
          }
        }
      }
#endif
        JLI_ReportErrorMessage(DLL_ERROR1, __LINE__);
        JLI_ReportErrorMessage(DLL_ERROR2, jvmpath, dlerror());
        return JNI_FALSE;
    }

    ifn->CreateJavaVM = (CreateJavaVM_t)
        dlsym(libjvm, "JNI_CreateJavaVM");
    if (ifn->CreateJavaVM == NULL) {
        JLI_ReportErrorMessage(DLL_ERROR2, jvmpath, dlerror());
        return JNI_FALSE;
    }

    ifn->GetDefaultJavaVMInitArgs = (GetDefaultJavaVMInitArgs_t)
        dlsym(libjvm, "JNI_GetDefaultJavaVMInitArgs");
    if (ifn->GetDefaultJavaVMInitArgs == NULL) {
        JLI_ReportErrorMessage(DLL_ERROR2, jvmpath, dlerror());
        return JNI_FALSE;
    }

    ifn->GetCreatedJavaVMs = (GetCreatedJavaVMs_t)
        dlsym(libjvm, "JNI_GetCreatedJavaVMs");
    if (ifn->GetCreatedJavaVMs == NULL) {
        JLI_ReportErrorMessage(DLL_ERROR2, jvmpath, dlerror());
        return JNI_FALSE;
    }

    return JNI_TRUE;
}

int
JVMInit(InvocationFunctions* ifn, jlong threadStackSize,
        int argc, char **argv,
        int mode, char *what, int ret)
{
    ShowSplashScreen();
    return ContinueInNewThread(ifn, threadStackSize, argc, argv, mode, what, ret);
}

int
ContinueInNewThread(InvocationFunctions* ifn, jlong threadStackSize,
                    int argc, char **argv,
                    int mode, char *what, int ret)
{

    /*
     * If user doesn't specify stack size, check if VM has a preference.
     * Note that HotSpot no longer supports JNI_VERSION_1_1 but it will
     * return its default stack size through the init args structure.
     */
    if (threadStackSize == 0) {
      struct JDK1_1InitArgs args1_1;
      memset((void*)&args1_1, 0, sizeof(args1_1));
      args1_1.version = JNI_VERSION_1_1;
      ifn->GetDefaultJavaVMInitArgs(&args1_1);  /* ignore return value */
      if (args1_1.javaStackSize > 0) {
         threadStackSize = args1_1.javaStackSize;
      }
    }

    { /* Create a new thread to create JVM and invoke main method */
      JavaMainArgs args;
      int rslt;

      args.argc = argc;
      args.argv = argv;
      args.mode = mode;
      args.what = what;
      args.ifn = *ifn;

      rslt = ContinueInNewThread0(JavaMain, threadStackSize, (void*)&args);
      /* If the caller has deemed there is an error we
       * simply return that, otherwise we return the value of
       * the callee
       */
      return (ret != 0) ? ret : rslt;
    }
}

JNI_IMPORT_OR_EXPORT_ jint JNICALL JNI_CreateJavaVM(JavaVM **vm, void **penv, void *args) {
#ifndef USDT2
  HS_DTRACE_PROBE3(hotspot_jni, CreateJavaVM__entry, vm, penv, args);
#else /* USDT2 */
  HOTSPOT_JNI_CREATEJAVAVM_ENTRY(
                                 (void **) vm, penv, args);
#endif /* USDT2 */

  jint result = JNI_ERR;
  DT_RETURN_MARK(CreateJavaVM, jint, (const jint&)result);

#if defined(ZERO) && defined(ASSERT)
  {
    jint a = 0xcafebabe;
    jint b = Atomic::xchg(0xdeadbeef, &a);
    void *c = &a;
    void *d = Atomic::xchg_ptr(&b, &c);
    assert(a == (jint) 0xdeadbeef && b == (jint) 0xcafebabe, "Atomic::xchg() works");
    assert(c == &b && d == &a, "Atomic::xchg_ptr() works");
  }
#endif // ZERO && ASSERT

  if (Atomic::xchg(1, &vm_created) == 1) {
    return JNI_EEXIST;   // already created, or create attempt in progress
  }
  if (Atomic::xchg(0, &safe_to_recreate_vm) == 0) {
    return JNI_ERR;  // someone tried and failed and retry not allowed.
  }

  assert(vm_created == 1, "vm_created is true during the creation");


  bool can_try_again = true;

  result = Threads::create_vm((JavaVMInitArgs*) args, &can_try_again);
  if (result == JNI_OK) {
    JavaThread *thread = JavaThread::current();
    /* thread is thread_in_vm here */
    *vm = (JavaVM *)(&main_vm);
    *(JNIEnv**)penv = thread->jni_environment();

    // Tracks the time application was running before GC
    RuntimeService::record_application_start();

    // Notify JVMTI
    if (JvmtiExport::should_post_thread_life()) {
       JvmtiExport::post_thread_start(thread);
    }

    EventThreadStart event;
    if (event.should_commit()) {
      event.set_javalangthread(java_lang_Thread::thread_id(thread->threadObj()));
      event.commit();
    }

#ifndef PRODUCT
  #ifndef TARGET_OS_FAMILY_windows
    #define CALL_TEST_FUNC_WITH_WRAPPER_IF_NEEDED(f) f()
  #endif

    // Check if we should compile all classes on bootclasspath
    if (CompileTheWorld) ClassLoader::compile_the_world();
    if (ReplayCompiles) ciReplay::replay(thread);

    // Some platforms (like Win*) need a wrapper around these test
    // functions in order to properly handle error conditions.
    CALL_TEST_FUNC_WITH_WRAPPER_IF_NEEDED(test_error_handler);
    CALL_TEST_FUNC_WITH_WRAPPER_IF_NEEDED(execute_internal_vm_tests);
#endif

    // Since this is not a JVM_ENTRY we have to set the thread state manually before leaving.
    ThreadStateTransition::transition_and_fence(thread, _thread_in_vm, _thread_in_native);
  } else {
    if (can_try_again) {
      // reset safe_to_recreate_vm to 1 so that retrial would be possible
      safe_to_recreate_vm = 1;
    }

    // Creation failed. We must reset vm_created
    *vm = 0;
    *(JNIEnv**)penv = 0;
    // reset vm_created last to avoid race condition. Use OrderAccess to
    // control both compiler and architectural-based reordering.
    OrderAccess::release_store(&vm_created, 0);
  }

  return result;
}

void vm_init_globals() {
  check_ThreadShadow();
  basic_types_init();
  eventlog_init();
  mutex_init();
  chunkpool_init();
  perfMemory_init();
}

jint init_globals() {
  HandleMark hm;
  management_init();
  bytecodes_init();
  classLoader_init();
  codeCache_init();
  VM_Version_init();
  os_init_globals();
  stubRoutines_init1();
  jint status = universe_init();  // dependent on codeCache_init and
                                  // stubRoutines_init1 and metaspace_init.
  if (status != JNI_OK)
    return status;

  interpreter_init();  // before any methods loaded
  invocationCounter_init();  // before any methods loaded
  marksweep_init();
  accessFlags_init();
  templateTable_init();
  InterfaceSupport_init();
  SharedRuntime::generate_stubs();
  universe2_init();  // dependent on codeCache_init and stubRoutines_init1
  referenceProcessor_init();
  jni_handles_init();
#if INCLUDE_VM_STRUCTS
  vmStructs_init();
#endif // INCLUDE_VM_STRUCTS

  vtableStubs_init();
  InlineCacheBuffer_init();
  compilerOracle_init();
  compilationPolicy_init();
  compileBroker_init();
  VMRegImpl::set_regName();

  if (!universe_post_init()) {
    return JNI_ERR;
  }
  javaClasses_init();   // must happen after vtable initialization
  stubRoutines_init2(); // note: StubRoutines need 2-phase init

  // All the flags that get adjusted by VM_Version_init and os::init_2
  // have been set so dump the flags now.
  if (PrintFlagsFinal) {
    CommandLineFlags::printFlags(tty, false);
  }

  return JNI_OK;
}