/* All JVM fatal error exits lead here (e.g. we need to kill the VM). */
static void
jniFatalError(JNIEnv *env, const char *msg, jvmtiError error, int exit_code)
{
JavaVM *vm;
char buf[512];
gdata->vmDead = JNI_TRUE;
if ( msg==NULL )
msg = "UNKNOWN REASON";
vm = gdata->jvm;
if ( env==NULL && vm!=NULL ) {
jint rc = (*((*vm)->GetEnv))(vm, (void **)&env, JNI_VERSION_1_2);
if (rc != JNI_OK ) {
env = NULL;
}
}
if ( error != JVMTI_ERROR_NONE ) {
(void)snprintf(buf, sizeof(buf), "JDWP %s, jvmtiError=%s(%d)",
msg, jvmtiErrorText(error), error);
} else {
(void)snprintf(buf, sizeof(buf), "JDWP %s", buf);
}
if (env != NULL) {
(*((*env)->FatalError))(env, buf);
} else {
/* Should rarely ever reach here, means VM is really dead */
print_message(stderr, "ERROR: JDWP: ", "\n",
"Can't call JNI FatalError(NULL, \"%s\")", buf);
}
forceExit(exit_code);
}
static jvmtiError
set_event_notification(jvmtiEventMode mode, EventIndex ei)
{
jvmtiError error;
error = JVMTI_FUNC_PTR(gdata->jvmti,SetEventNotificationMode)
(gdata->jvmti, mode, eventIndex2jvmti(ei), NULL);
if (error != JVMTI_ERROR_NONE) {
ERROR_MESSAGE(("JDWP unable to configure initial JVMTI event %s: %s(%d)",
eventText(ei), jvmtiErrorText(error), error));
}
return error;
}
/* All normal exit doors lead here */
void
debugInit_exit(jvmtiError error, const char *msg)
{
enum exit_codes { EXIT_NO_ERRORS = 0, EXIT_JVMTI_ERROR = 1, EXIT_TRANSPORT_ERROR = 2 };
// Prepare to exit. Log error and finish logging
LOG_MISC(("Exiting with error %s(%d): %s", jvmtiErrorText(error), error,
((msg == NULL) ? "" : msg)));
// coredump requested by command line. Keep JVMTI data dirty
if (error != JVMTI_ERROR_NONE && docoredump) {
LOG_MISC(("Dumping core as requested by command line"));
finish_logging();
abort();
}
finish_logging();
// Cleanup the JVMTI if we have one
if (gdata != NULL) {
gdata->vmDead = JNI_TRUE;
if (gdata->jvmti != NULL) {
// Dispose of jvmti (gdata->jvmti becomes NULL)
disposeEnvironment(gdata->jvmti);
}
}
// We are here with no errors. Kill entire process and exit with zero exit code
if (error == JVMTI_ERROR_NONE) {
forceExit(EXIT_NO_ERRORS);
return;
}
// No transport initilized.
// As we don't have any details here exiting with separate exit code
if (error == AGENT_ERROR_TRANSPORT_INIT) {
forceExit(EXIT_TRANSPORT_ERROR);
return;
}
// We have JVMTI error. Call hotspot jni_FatalError handler
jniFatalError(NULL, msg, error, EXIT_JVMTI_ERROR);
// hotspot calls os:abort() so we should never reach code below,
// but guard against possible hotspot changes
// Last chance to die, this kills the entire process.
forceExit(EXIT_JVMTI_ERROR);
}
static void
disposeEnvironment(jvmtiEnv *jvmti_env)
{
jvmtiError error;
error = JVMTI_FUNC_PTR(jvmti_env,DisposeEnvironment)(jvmti_env);
if ( error == JVMTI_ERROR_MUST_POSSESS_CAPABILITY )
error = JVMTI_ERROR_NONE; /* Hack! FIXUP when JVMTI has disposeEnv */
/* What should error return say? */
if (error != JVMTI_ERROR_NONE) {
ERROR_MESSAGE(("JDWP unable to dispose of JVMTI environment: %s(%d)",
jvmtiErrorText(error), error));
}
gdata->jvmti = NULL;
}
/* All normal exit doors lead here */
void
debugInit_exit(jvmtiError error, const char *msg)
{
int exit_code = 0;
/* Pick an error code */
if ( error != JVMTI_ERROR_NONE ) {
exit_code = 1;
if ( docoredump ) {
finish_logging(exit_code);
abort();
}
}
if ( msg==NULL ) {
msg = "";
}
LOG_MISC(("Exiting with error %s(%d): %s", jvmtiErrorText(error), error, msg));
gdata->vmDead = JNI_TRUE;
/* Let's try and cleanup the JVMTI, if we even have one */
if ( gdata->jvmti != NULL ) {
/* Dispose of jvmti (gdata->jvmti becomes NULL) */
disposeEnvironment(gdata->jvmti);
}
/* Finish up logging. We reach here if JDWP is doing the exiting. */
finish_logging(exit_code); /* Only first call matters */
/* Let's give the JNI a FatalError if non-exit 0, which is historic way */
if ( exit_code != 0 ) {
JNIEnv *env = NULL;
jniFatalError(env, msg, error, exit_code);
}
/* Last chance to die, this kills the entire process. */
forceExit(exit_code);
}
/* OnLoad startup:
* Returning JNI_ERR will cause the java_g VM to core dump, be careful.
*/
JNIEXPORT jint JNICALL
DEF_Agent_OnLoad(JavaVM *vm, char *options, void *reserved)
{
jvmtiError error;
jvmtiCapabilities needed_capabilities;
jvmtiCapabilities potential_capabilities;
jint jvmtiCompileTimeMajorVersion;
jint jvmtiCompileTimeMinorVersion;
jint jvmtiCompileTimeMicroVersion;
/* See if it's already loaded */
if ( gdata!=NULL && gdata->isLoaded==JNI_TRUE ) {
ERROR_MESSAGE(("Cannot load this JVM TI agent twice, check your java command line for duplicate jdwp options."));
return JNI_ERR;
}
/* If gdata is defined and the VM died, why are we here? */
if ( gdata!=NULL && gdata->vmDead ) {
ERROR_MESSAGE(("JDWP unable to load, VM died"));
return JNI_ERR;
}
/* Get global data area */
gdata = get_gdata();
if (gdata == NULL) {
ERROR_MESSAGE(("JDWP unable to allocate memory"));
return JNI_ERR;
}
gdata->isLoaded = JNI_TRUE;
/* Start filling in gdata */
gdata->jvm = vm;
vmInitialized = JNI_FALSE;
gdata->vmDead = JNI_FALSE;
/* Get the JVMTI Env, IMPORTANT: Do this first! For jvmtiAllocate(). */
error = JVM_FUNC_PTR(vm,GetEnv)
(vm, (void **)&(gdata->jvmti), JVMTI_VERSION_1);
if (error != JNI_OK) {
ERROR_MESSAGE(("JDWP unable to access JVMTI Version 1 (0x%x),"
" is your J2SE a 1.5 or newer version?"
" JNIEnv's GetEnv() returned %d",
JVMTI_VERSION_1, error));
forceExit(1); /* Kill entire process, no core dump */
}
/* Check to make sure the version of jvmti.h we compiled with
* matches the runtime version we are using.
*/
jvmtiCompileTimeMajorVersion = ( JVMTI_VERSION & JVMTI_VERSION_MASK_MAJOR )
>> JVMTI_VERSION_SHIFT_MAJOR;
jvmtiCompileTimeMinorVersion = ( JVMTI_VERSION & JVMTI_VERSION_MASK_MINOR )
>> JVMTI_VERSION_SHIFT_MINOR;
jvmtiCompileTimeMicroVersion = ( JVMTI_VERSION & JVMTI_VERSION_MASK_MICRO )
>> JVMTI_VERSION_SHIFT_MICRO;
/* Check for compatibility */
if ( !compatible_versions(jvmtiMajorVersion(), jvmtiMinorVersion(),
jvmtiCompileTimeMajorVersion, jvmtiCompileTimeMinorVersion) ) {
ERROR_MESSAGE(("This jdwp native library will not work with this VM's "
"version of JVMTI (%d.%d.%d), it needs JVMTI %d.%d[.%d].",
jvmtiMajorVersion(),
jvmtiMinorVersion(),
jvmtiMicroVersion(),
jvmtiCompileTimeMajorVersion,
jvmtiCompileTimeMinorVersion,
jvmtiCompileTimeMicroVersion));
/* Do not let VM get a fatal error, we don't want a core dump here. */
forceExit(1); /* Kill entire process, no core dump wanted */
}
/* Parse input options */
if (!parseOptions(options)) {
/* No message necessary, should have been printed out already */
/* Do not let VM get a fatal error, we don't want a core dump here. */
forceExit(1); /* Kill entire process, no core dump wanted */
}
LOG_MISC(("Onload: %s", options));
/* Get potential capabilities */
(void)memset(&potential_capabilities,0,sizeof(potential_capabilities));
error = JVMTI_FUNC_PTR(gdata->jvmti,GetPotentialCapabilities)
(gdata->jvmti, &potential_capabilities);
if (error != JVMTI_ERROR_NONE) {
ERROR_MESSAGE(("JDWP unable to get potential JVMTI capabilities: %s(%d)",
jvmtiErrorText(error), error));
return JNI_ERR;
}
/* Fill in ones that we must have */
(void)memset(&needed_capabilities,0,sizeof(needed_capabilities));
needed_capabilities.can_access_local_variables = 1;
needed_capabilities.can_generate_single_step_events = 1;
needed_capabilities.can_generate_exception_events = 1;
needed_capabilities.can_generate_frame_pop_events = 1;
needed_capabilities.can_generate_breakpoint_events = 1;
needed_capabilities.can_suspend = 1;
needed_capabilities.can_generate_method_entry_events = 1;
needed_capabilities.can_generate_method_exit_events = 1;
needed_capabilities.can_generate_garbage_collection_events = 1;
needed_capabilities.can_maintain_original_method_order = 1;
needed_capabilities.can_generate_monitor_events = 1;
needed_capabilities.can_tag_objects = 1;
/* And what potential ones that would be nice to have */
needed_capabilities.can_force_early_return
= potential_capabilities.can_force_early_return;
needed_capabilities.can_generate_field_modification_events
= potential_capabilities.can_generate_field_modification_events;
needed_capabilities.can_generate_field_access_events
= potential_capabilities.can_generate_field_access_events;
needed_capabilities.can_get_bytecodes
= potential_capabilities.can_get_bytecodes;
needed_capabilities.can_get_synthetic_attribute
= potential_capabilities.can_get_synthetic_attribute;
needed_capabilities.can_get_owned_monitor_info
= potential_capabilities.can_get_owned_monitor_info;
needed_capabilities.can_get_current_contended_monitor
= potential_capabilities.can_get_current_contended_monitor;
needed_capabilities.can_get_monitor_info
= potential_capabilities.can_get_monitor_info;
needed_capabilities.can_pop_frame
= potential_capabilities.can_pop_frame;
needed_capabilities.can_redefine_classes
= potential_capabilities.can_redefine_classes;
needed_capabilities.can_redefine_any_class
= potential_capabilities.can_redefine_any_class;
needed_capabilities.can_get_owned_monitor_stack_depth_info
= potential_capabilities.can_get_owned_monitor_stack_depth_info;
needed_capabilities.can_get_constant_pool
= potential_capabilities.can_get_constant_pool;
{
needed_capabilities.can_get_source_debug_extension = 1;
needed_capabilities.can_get_source_file_name = 1;
needed_capabilities.can_get_line_numbers = 1;
needed_capabilities.can_signal_thread
= potential_capabilities.can_signal_thread;
}
/* Add the capabilities */
error = JVMTI_FUNC_PTR(gdata->jvmti,AddCapabilities)
(gdata->jvmti, &needed_capabilities);
if (error != JVMTI_ERROR_NONE) {
ERROR_MESSAGE(("JDWP unable to get necessary JVMTI capabilities."));
forceExit(1); /* Kill entire process, no core dump wanted */
}
/* Initialize event number mapping tables */
eventIndexInit();
/* Set the initial JVMTI event notifications */
error = set_event_notification(JVMTI_ENABLE, EI_VM_DEATH);
if (error != JVMTI_ERROR_NONE) {
return JNI_ERR;
}
error = set_event_notification(JVMTI_ENABLE, EI_VM_INIT);
if (error != JVMTI_ERROR_NONE) {
return JNI_ERR;
}
if (initOnUncaught || (initOnException != NULL)) {
error = set_event_notification(JVMTI_ENABLE, EI_EXCEPTION);
if (error != JVMTI_ERROR_NONE) {
return JNI_ERR;
}
}
/* Set callbacks just for 3 functions */
(void)memset(&(gdata->callbacks),0,sizeof(gdata->callbacks));
gdata->callbacks.VMInit = &cbEarlyVMInit;
gdata->callbacks.VMDeath = &cbEarlyVMDeath;
gdata->callbacks.Exception = &cbEarlyException;
error = JVMTI_FUNC_PTR(gdata->jvmti,SetEventCallbacks)
(gdata->jvmti, &(gdata->callbacks), sizeof(gdata->callbacks));
if (error != JVMTI_ERROR_NONE) {
ERROR_MESSAGE(("JDWP unable to set JVMTI event callbacks: %s(%d)",
jvmtiErrorText(error), error));
return JNI_ERR;
}
LOG_MISC(("OnLoad: DONE"));
return JNI_OK;
}