JAVA中的JVM怎么載入函數(shù)

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JVM 載入函數(shù)

/*

 * Load a jvm from "jvmpath" and initialize the invocation functions.

 */

jboolean

LoadJavaVM(const char *jvmpath, InvocationFunctions *ifn)

{

    HINSTANCE handle;

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

    /*

     * The Microsoft C Runtime Library needs to be loaded first.  A copy is

     * assumed to be present in the "JRE path" directory.  If it is not found

     * there (or "JRE path" fails to resolve), skip the explicit load and let

     * nature take its course, which is likely to be a failure to execute.

     *

     */

    LoadMSVCRT();

    /* Load the Java VM DLL */

    if ((handle = LoadLibrary(jvmpath)) == 0) {

        JLI_ReportErrorMessage(DLL_ERROR4, (char *)jvmpath);

        return JNI_FALSE;

    }

    /* Now get the function addresses */

    ifn->CreateJavaVM =

        (void *)GetProcAddress(handle, "JNI_CreateJavaVM");

    //初始化默認(rèn)參數(shù)

    ifn->GetDefaultJavaVMInitArgs =

        (void *)GetProcAddress(handle, "JNI_GetDefaultJavaVMInitArgs");

    if (ifn->CreateJavaVM == 0 || ifn->GetDefaultJavaVMInitArgs == 0) {

        JLI_ReportErrorMessage(JNI_ERROR1, (char *)jvmpath);

        return JNI_FALSE;

    }

    return JNI_TRUE;

}

//默認(rèn)參數(shù)結(jié)構(gòu)

/*

 * This structure is used by the launcher to get the default thread

 * stack size from the VM using JNI_GetDefaultJavaVMInitArgs() with a

 * version of 1.1.  As it is not supported otherwise, it has been removed

 * from jni.h

 */

typedef struct JDK1_1InitArgs {

    jint version;

    char **properties;

    jint checkSource;

    jint nativeStackSize;

    jint javaStackSize;

    jint minHeapSize;

    jint maxHeapSize;

    jint verifyMode;

    char *classpath;

    jint (JNICALL *vfprintf)(FILE *fp, const char *format, va_list args);

    void (JNICALL *exit)(jint code);

    void (JNICALL *abort)(void);

    jint enableClassGC;

    jint enableVerboseGC;

    jint disableAsyncGC;

    jint verbose;

    jboolean debugging;

    jint debugPort;

} JDK1_1InitArgs;

//工具函數(shù)，用于跟蹤jvm

void

JLI_TraceLauncher(const char* fmt, ...)

{

    va_list vl;

    if (_launcher_debug != JNI_TRUE) return;

    va_start(vl, fmt);

    vprintf(fmt,vl);

    va_end(vl);

    fflush(stdout);

}

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