| /* |
| * (c) Copyright IBM Corp., 2000, 2001 |
| * All Rights Reserved. |
| */ |
| |
| /**
|
| * globals.c
|
| *
|
| * This file contains the global struct allocation routines for the
|
| * SWT library.
|
| *
|
| */
|
|
|
| #include <malloc.h>
|
| #include <assert.h>
|
| #include <memory.h>
|
| #include <jni.h>
|
| #include "globals.h"
|
| #include "library.h"
|
|
|
| static void CreateLibGlobals(JNIEnv * env);
|
| static void DestroyLibGlobals(JNIEnv * env);
|
| static GLOBAL_TABLE * JNICALL GetGlobals(void);
|
|
|
| /* Place holder for all globals */
|
| GLOBALS globals = {0};
|
| GLOBAL_TABLE globals_table = {{
|
| 0, 0, 0, 0, 0, 0, 0, 0, /* 8 */
|
| 0, 0, 0, 0, 0, 0, 0, 0, /* 16 */
|
| 0, 0, 0, 0, 0, 0, 0, 0, /* 24 */
|
| 0, 0, 0, 0, 0, 0, 0, 0, /* 32 */
|
| 0, 0, 0, 0, 0, 0, 0, 0, /* 40 */
|
| 0, 0, 0, 0, 0, 0, 0, 0, /* 48 */
|
| 0, 0, 0, 0, 0, 0, 0, 0, /* 56 */
|
| 0, 0, 0, 0, 0, 0, 0, &globals, /* 64 */
|
| }};
|
| GetGlobalsFunc getGlobals = &GetGlobals;
|
| unsigned int vm_library = 0;
|
|
|
| /*
|
| * Hook the library load.
|
| */
|
| JNIEXPORT jint JNICALL JNI_OnLoad(JavaVM *vm, void *reserved)
|
| {
|
| JNIEnv * env;
|
|
|
| (*vm)->GetEnv(vm, (void **)&env, JNI_VERSION_1_2);
|
| vm_library = OpenLibrary("jvm");
|
| DEBUG_PRINTF(("VM Shared library -> %d\n", vm_library));
|
|
|
| if (vm_library != 0) {
|
| unsigned int func = LibraryLookupName(vm_library, "MdCurrentJNIGlobals");
|
| if (func == 0) func = LibraryLookupName(vm_library, "_MdCurrentJNIGlobals@0");
|
|
|
| DEBUG_PRINTF(("Function address -> %x\n", func));
|
| if (func != 0) getGlobals = (GetGlobalsFunc)func;
|
| }
|
| CreateLibGlobals(env);
|
| return JNI_VERSION_1_2;
|
| }
|
|
|
| /*
|
| * Hook the library unload.
|
| */
|
| JNIEXPORT void JNICALL JNI_OnUnload(JavaVM *vm, void *reserved)
|
| {
|
| JNIEnv * env;
|
|
|
| (*vm)->GetEnv(vm, (void **)&env, JNI_VERSION_1_2);
|
| DestroyLibGlobals(env);
|
| CloseLibrary(vm_library);
|
| }
|
|
|
| /*
|
| * Allocate and initialize a SWT GLOBALS struct.
|
| */
|
| static void CreateLibGlobals(JNIEnv * env)
|
| {
|
| GLOBALS * globs = GET_GLOBALS();
|
| if (globs != NULL && globs == &globals) return;
|
|
|
| globs = (GLOBALS *)malloc(sizeof(GLOBALS));
|
| if (!globs)
|
| {
|
| jclass hExcClass = (*env)->FindClass(env, "java/lang/OutOfMemoryError");
|
| assert(hExcClass);
|
| (*env)->ThrowNew(env, hExcClass, "Unable to allocate globals in onLoad");
|
| return;
|
| }
|
| memset(globs, 0, sizeof(GLOBALS));
|
|
|
| /* Start of initialization code. */
|
| globs->multidata = 1;
|
| globs->vajava = vm_library != 0 &&
|
| (LibraryLookupName(vm_library, "_MdCurrentJavaVM@0") != 0 ||
|
| LibraryLookupName(vm_library, "MdCurrentJavaVM") != 0);
|
| /* End of initialization code. */
|
|
|
| SET_GLOBALS(globs);
|
| }
|
|
|
| /*
|
| * Free a SWT GLOBALS struct.
|
| */
|
| static void DestroyLibGlobals(JNIEnv * env)
|
| {
|
| GLOBALS * globs = GET_GLOBALS();
|
| if (globs && (globs != &globals))
|
| {
|
| /* Start of cleanup code. */
|
| /* End of cleanup code. */
|
|
|
| free(globs);
|
|
|
| SET_GLOBALS(NULL);
|
| }
|
| }
|
|
|
| /* Note that the function below do not make
|
| * the vm reentrant but allow the multidata code
|
| * to work in non reentrant VMs.
|
| */
|
| /* Answer the table of globals associated with the current. */
|
| static GLOBAL_TABLE * JNICALL GetGlobals(void)
|
| {
|
| return &globals_table;
|
| }
|
