JDK14/Java14源码在线阅读
/*
* Copyright (c) 1998, 2019, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
#include <ctype.h>
#include "util.h"
#include "commonRef.h"
#include "debugDispatch.h"
#include "eventHandler.h"
#include "eventHelper.h"
#include "threadControl.h"
#include "stepControl.h"
#include "transport.h"
#include "classTrack.h"
#include "debugLoop.h"
#include "bag.h"
#include "invoker.h"
#include "sys.h"
/* How the options get to OnLoad: */
#define XRUN "-Xrunjdwp"
#define AGENTLIB "-agentlib:jdwp"
/* Debug version defaults */
#ifdef DEBUG
#define DEFAULT_ASSERT_ON JNI_TRUE
#define DEFAULT_ASSERT_FATAL JNI_TRUE
#define DEFAULT_LOGFILE "jdwp.log"
#else
#define DEFAULT_ASSERT_ON JNI_FALSE
#define DEFAULT_ASSERT_FATAL JNI_FALSE
#define DEFAULT_LOGFILE NULL
#endif
static jboolean vmInitialized;
static jrawMonitorID initMonitor;
static jboolean initComplete;
static jbyte currentSessionID;
/*
* Options set through the OnLoad options string. All of these values
* are set once at VM startup and never reset.
*/
static jboolean isServer = JNI_FALSE; /* Listens for connecting debuggers? */
static jboolean isStrict = JNI_FALSE; /* Unused */
static jboolean useStandardAlloc = JNI_FALSE; /* Use standard malloc/free? */
static struct bag *transports; /* of TransportSpec */
static jboolean initOnStartup = JNI_TRUE; /* init immediately */
static char *initOnException = NULL; /* init when this exception thrown */
static jboolean initOnUncaught = JNI_FALSE; /* init when uncaught exc thrown */
static char *launchOnInit = NULL; /* launch this app during init */
static jboolean suspendOnInit = JNI_TRUE; /* suspend all app threads after init */
static jboolean dopause = JNI_FALSE; /* pause for debugger attach */
static jboolean docoredump = JNI_FALSE; /* core dump on exit */
static char *logfile = NULL; /* Name of logfile (if logging) */
static unsigned logflags = 0; /* Log flags */
static char *names; /* strings derived from OnLoad options */
static jboolean allowStartViaJcmd = JNI_FALSE; /* if true we allow the debugging to be started via a jcmd */
static jboolean startedViaJcmd = JNI_FALSE; /* if false, we have not yet started debugging via a jcmd */
/*
* Elements of the transports bag
*/
typedef struct TransportSpec {
char *name;
char *address;
long timeout;
char *allow;
} TransportSpec;
/*
* Forward Refs
*/
static void JNICALL cbEarlyVMInit(jvmtiEnv*, JNIEnv *, jthread);
static void JNICALL cbEarlyVMDeath(jvmtiEnv*, JNIEnv *);
static void JNICALL cbEarlyException(jvmtiEnv*, JNIEnv *,
jthread, jmethodID, jlocation, jobject, jmethodID, jlocation);
static void initialize(JNIEnv *env, jthread thread, EventIndex triggering_ei);
static jboolean parseOptions(char *str);
/*
* Phase 1: Initial load.
*
* OnLoad is called by the VM immediately after the back-end
* library is loaded. We can do very little in this function since
* the VM has not completed initialization. So, we parse the JDWP
* options and set up a simple initial event callbacks for JVMTI events.
* When a triggering event occurs, that callback will begin debugger initialization.
*/
/* Get a static area to hold the Global Data */
static BackendGlobalData *
get_gdata(void)
{
static BackendGlobalData s;
(void)memset(&s, 0, sizeof(BackendGlobalData));
return &s;
}
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;
}
typedef struct {
int major;
int minor;
} version_type;
typedef struct {
version_type runtime;
version_type compiletime;
} compatible_versions_type;
/*
* List of explicitly compatible JVMTI versions, specified as
* { runtime version, compile-time version } pairs. -1 is a wildcard.
*/
static int nof_compatible_versions = 3;
static compatible_versions_type compatible_versions_list[] = {
/*
* FIXUP: Allow version 0 to be compatible with anything
* Special check for FCS of 1.0.
*/
{ { 0, -1 }, { -1, -1 } },
{ { -1, -1 }, { 0, -1 } },
/*
* 1.2 is runtime compatible with 1.1 -- just make sure to check the
* version before using any new 1.2 features
*/
{ { 1, 1 }, { 1, 2 } }
};
/* Logic to determine JVMTI version compatibility */
static jboolean
compatible_versions(jint major_runtime, jint minor_runtime,
jint major_compiletime, jint minor_compiletime)
{
/*
* First check to see if versions are explicitly compatible via the
* list specified above.
*/
int i;
for (i = 0; i < nof_compatible_versions; ++i) {
version_type runtime = compatible_versions_list[i].runtime;
version_type comptime = compatible_versions_list[i].compiletime;
if ((major_runtime == runtime.major || runtime.major == -1) &&
(minor_runtime == runtime.minor || runtime.minor == -1) &&
(major_compiletime == comptime.major || comptime.major == -1) &&
(minor_compiletime == comptime.minor || comptime.minor == -1)) {
return JNI_TRUE;
}
}
return major_runtime == major_compiletime &&
minor_runtime >= minor_compiletime;
}
/* 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;
}
JNIEXPORT void JNICALL
DEF_Agent_OnUnload(JavaVM *vm)
{
gdata->isLoaded = JNI_FALSE;
/* Cleanup, but make sure VM is alive before using JNI, and
* make sure JVMTI environment is ok before deallocating
* memory allocated through JVMTI, which all of it is.
*/
/*
* Close transport before exit
*/
if (transport_is_open()) {
transport_close();
}
}
/*
* Phase 2: Initial events. Phase 2 consists of waiting for the
* event that triggers full initialization. Under normal circumstances
* (initOnStartup == TRUE) this is the JVMTI_EVENT_VM_INIT event.
* Otherwise, we delay initialization until the app throws a
* particular exception. The triggering event invokes
* the bulk of the initialization, including creation of threads and
* monitors, transport setup, and installation of a new event callback which
* handles the complete set of events.
*
* Since the triggering event comes in on an application thread, some of the
* initialization is difficult to do here. Specifically, this thread along
* with all other app threads may need to be suspended until a debugger
* connects. These kinds of tasks are left to the third phase which is
* invoked by one of the spawned debugger threads, the event handler.
*/
/*
* Wait for a triggering event; then kick off debugger
* initialization. A different event callback will be installed by
* debugger initialization, and this function will not be called
* again.
*/
/*
* TO DO: Decide whether we need to protect this code with
* a lock. It might be too early to create a monitor safely (?).
*/
static void JNICALL
cbEarlyVMInit(jvmtiEnv *jvmti_env, JNIEnv *env, jthread thread)
{
LOG_CB(("cbEarlyVMInit"));
if ( gdata->vmDead ) {
EXIT_ERROR(AGENT_ERROR_INTERNAL,"VM dead at VM_INIT time");
}
if (initOnStartup)
initialize(env, thread, EI_VM_INIT);
vmInitialized = JNI_TRUE;
LOG_MISC(("END cbEarlyVMInit"));
}
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;
}
static void JNICALL
cbEarlyVMDeath(jvmtiEnv *jvmti_env, JNIEnv *env)
{
LOG_CB(("cbEarlyVMDeath"));
if ( gdata->vmDead ) {
EXIT_ERROR(AGENT_ERROR_INTERNAL,"VM died more than once");
}
disposeEnvironment(jvmti_env);
gdata->jvmti = NULL;
gdata->jvm = NULL;
gdata->vmDead = JNI_TRUE;
LOG_MISC(("END cbEarlyVMDeath"));
}
static void JNICALL
cbEarlyException(jvmtiEnv *jvmti_env, JNIEnv *env,
jthread thread, jmethodID method, jlocation location,
jobject exception,
jmethodID catch_method, jlocation catch_location)
{
jvmtiError error;
jthrowable currentException;
LOG_CB(("cbEarlyException: thread=%p", thread));
if ( gdata->vmDead ) {
EXIT_ERROR(AGENT_ERROR_INTERNAL,"VM dead at initial Exception event");
}
if (!vmInitialized) {
LOG_MISC(("VM is not initialized yet"));
return;
}
/*
* We want to preserve any current exception that might get wiped
* out during event handling (e.g. JNI calls). We have to rely on
* space for the local reference on the current frame because
* doing a PushLocalFrame here might itself generate an exception.
*/
currentException = JNI_FUNC_PTR(env,ExceptionOccurred)(env);
JNI_FUNC_PTR(env,ExceptionClear)(env);
if (initOnUncaught && catch_method == NULL) {
LOG_MISC(("Initializing on uncaught exception"));
initialize(env, thread, EI_EXCEPTION);
} else if (initOnException != NULL) {
jclass clazz;
/* Get class of exception thrown */
clazz = JNI_FUNC_PTR(env,GetObjectClass)(env, exception);
if ( clazz != NULL ) {
char *signature = NULL;
/* initing on throw, check */
error = classSignature(clazz, &signature, NULL);
LOG_MISC(("Checking specific exception: looking for %s, got %s",
initOnException, signature));
if ( (error==JVMTI_ERROR_NONE) &&
(strcmp(signature, initOnException) == 0)) {
LOG_MISC(("Initializing on specific exception"));
initialize(env, thread, EI_EXCEPTION);
} else {
error = AGENT_ERROR_INTERNAL; /* Just to cause restore */
}
if ( signature != NULL ) {
jvmtiDeallocate(signature);
}
} else {
error = AGENT_ERROR_INTERNAL; /* Just to cause restore */
}
/* If initialize didn't happen, we need to restore things */
if ( error != JVMTI_ERROR_NONE ) {
/*
* Restore exception state from before callback call
*/
LOG_MISC(("No initialization, didn't find right exception"));
if (currentException != NULL) {
JNI_FUNC_PTR(env,Throw)(env, currentException);
} else {
JNI_FUNC_PTR(env,ExceptionClear)(env);
}
}
}
LOG_MISC(("END cbEarlyException"));
}
typedef struct EnumerateArg {
jboolean isServer;
jdwpError error;
jint startCount;
} EnumerateArg;
static jboolean
startTransport(void *item, void *arg)
{
TransportSpec *transport = item;
EnumerateArg *enumArg = arg;
jdwpError serror;
LOG_MISC(("Begin startTransport"));
serror = transport_startTransport(enumArg->isServer, transport->name,
transport->address, transport->timeout,
transport->allow);
if (serror != JDWP_ERROR(NONE)) {
ERROR_MESSAGE(("JDWP Transport %s failed to initialize, %s(%d)",
transport->name, jdwpErrorText(serror), serror));
enumArg->error = serror;
} else {
/* (Don't overwrite any previous error) */
enumArg->startCount++;
}
LOG_MISC(("End startTransport"));
return JNI_TRUE; /* Always continue, even if there was an error */
}
static void
signalInitComplete(void)
{
/*
* Initialization is complete
*/
LOG_MISC(("signal initialization complete"));
debugMonitorEnter(initMonitor);
initComplete = JNI_TRUE;
debugMonitorNotifyAll(initMonitor);
debugMonitorExit(initMonitor);
}
/*
* Determine if initialization is complete.
*/
jboolean
debugInit_isInitComplete(void)
{
return initComplete;
}
/*
* Wait for all initialization to complete.
*/
void
debugInit_waitInitComplete(void)
{
debugMonitorEnter(initMonitor);
while (!initComplete) {
debugMonitorWait(initMonitor);
}
debugMonitorExit(initMonitor);
}
/* All process exit() calls come from here */
void
forceExit(int exit_code)
{
/* make sure the transport is closed down before we exit() */
transport_close();
exit(exit_code);
}
/* 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", msg);
}
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);
}
/*
* Initialize debugger back end modules
*/
static void
initialize(JNIEnv *env, jthread thread, EventIndex triggering_ei)
{
jvmtiError error;
EnumerateArg arg;
jbyte suspendPolicy;
LOG_MISC(("Begin initialize()"));
currentSessionID = 0;
initComplete = JNI_FALSE;
if ( gdata->vmDead ) {
EXIT_ERROR(AGENT_ERROR_INTERNAL,"VM dead at initialize() time");
}
/* Turn off the initial JVMTI event notifications */
error = set_event_notification(JVMTI_DISABLE, EI_EXCEPTION);
if (error != JVMTI_ERROR_NONE) {
EXIT_ERROR(error, "unable to disable JVMTI event notification");
}
error = set_event_notification(JVMTI_DISABLE, EI_VM_INIT);
if (error != JVMTI_ERROR_NONE) {
EXIT_ERROR(error, "unable to disable JVMTI event notification");
}
error = set_event_notification(JVMTI_DISABLE, EI_VM_DEATH);
if (error != JVMTI_ERROR_NONE) {
EXIT_ERROR(error, "unable to disable JVMTI event notification");
}
/* Remove initial event callbacks */
(void)memset(&(gdata->callbacks),0,sizeof(gdata->callbacks));
error = JVMTI_FUNC_PTR(gdata->jvmti,SetEventCallbacks)
(gdata->jvmti, &(gdata->callbacks), sizeof(gdata->callbacks));
if (error != JVMTI_ERROR_NONE) {
EXIT_ERROR(error, "unable to clear JVMTI callbacks");
}
commonRef_initialize();
util_initialize(env);
threadControl_initialize();
stepControl_initialize();
invoker_initialize();
debugDispatch_initialize();
classTrack_initialize(env);
debugLoop_initialize();
initMonitor = debugMonitorCreate("JDWP Initialization Monitor");
/*
* Initialize transports
*/
arg.isServer = isServer;
arg.error = JDWP_ERROR(NONE);
arg.startCount = 0;
transport_initialize();
(void)bagEnumerateOver(transports, startTransport, &arg);
/*
* Exit with an error only if
* 1) none of the transports was successfully started, and
* 2) the application has not yet started running
*/
if ((arg.error != JDWP_ERROR(NONE)) &&
(arg.startCount == 0) &&
initOnStartup) {
EXIT_ERROR(map2jvmtiError(arg.error), "No transports initialized");
}
eventHandler_initialize(currentSessionID);
signalInitComplete();
transport_waitForConnection();
suspendPolicy = suspendOnInit ? JDWP_SUSPEND_POLICY(ALL)
: JDWP_SUSPEND_POLICY(NONE);
if (triggering_ei == EI_VM_INIT) {
LOG_MISC(("triggering_ei == EI_VM_INIT"));
eventHelper_reportVMInit(env, currentSessionID, thread, suspendPolicy);
} else {
/*
* TO DO: Kludgy way of getting the triggering event to the
* just-attached debugger. It would be nice to make this a little
* cleaner. There is also a race condition where other events
* can get in the queue (from other not-yet-suspended threads)
* before this one does. (Also need to handle allocation error below?)
*/
EventInfo info;
struct bag *initEventBag;
LOG_MISC(("triggering_ei != EI_VM_INIT"));
initEventBag = eventHelper_createEventBag();
(void)memset(&info,0,sizeof(info));
info.ei = triggering_ei;
eventHelper_recordEvent(&info, 0, suspendPolicy, initEventBag);
(void)eventHelper_reportEvents(currentSessionID, initEventBag);
bagDestroyBag(initEventBag);
}
if ( gdata->vmDead ) {
EXIT_ERROR(AGENT_ERROR_INTERNAL,"VM dead before initialize() completes");
}
LOG_MISC(("End initialize()"));
}
/*
* Restore all static data to the initialized state so that another
* debugger can connect properly later.
*/
void
debugInit_reset(JNIEnv *env)
{
EnumerateArg arg;
LOG_MISC(("debugInit_reset() beginning"));
currentSessionID++;
initComplete = JNI_FALSE;
eventHandler_reset(currentSessionID);
transport_reset();
debugDispatch_reset();
invoker_reset();
stepControl_reset();
threadControl_reset();
util_reset();
commonRef_reset(env);
classTrack_reset();
/*
* If this is a server, we are now ready to accept another connection.
* If it's a client, then we've cleaned up some (more should be added
* later) and we're done.
*/
if (isServer) {
arg.isServer = JNI_TRUE;
arg.error = JDWP_ERROR(NONE);
arg.startCount = 0;
(void)bagEnumerateOver(transports, startTransport, &arg);
signalInitComplete();
transport_waitForConnection();
} else {
signalInitComplete(); /* Why? */
}
LOG_MISC(("debugInit_reset() completed."));
}
char *
debugInit_launchOnInit(void)
{
return launchOnInit;
}
jboolean
debugInit_suspendOnInit(void)
{
return suspendOnInit;
}
/*
* code below is shamelessly swiped from hprof.
*/
static int
get_tok(char **src, char *buf, int buflen, char sep)
{
int i;
char *p = *src;
for (i = 0; i < buflen; i++) {
if (p[i] == 0 || p[i] == sep) {
buf[i] = 0;
if (p[i] == sep) {
i++;
}
*src += i;
return i;
}
buf[i] = p[i];
}
/* overflow */
return 0;
}
static void
printUsage(void)
{
TTY_MESSAGE((
" Java Debugger JDWP Agent Library\n"
" --------------------------------\n"
"\n"
" (see http://java.sun.com/products/jpda for more information)\n"
"\n"
"jdwp usage: java " AGENTLIB "=[help]|[<option>=<value>, ...]\n"
"\n"
"Option Name and Value Description Default\n"
"--------------------- ----------- -------\n"
"suspend=y|n wait on startup? y\n"
"transport=<name> transport spec none\n"
"address=<listen/attach address> transport spec \"\"\n"
"server=y|n listen for debugger? n\n"
"launch=<command line> run debugger on event none\n"
"onthrow=<exception name> debug on throw none\n"
"onuncaught=y|n debug on any uncaught? n\n"
"timeout=<timeout value> for listen/attach in milliseconds n\n"
"mutf8=y|n output modified utf-8 n\n"
"quiet=y|n control over terminal messages n\n"));
TTY_MESSAGE((
"Obsolete Options\n"
"----------------\n"
"strict=y|n\n"
"stdalloc=y|n\n"
"\n"
"Examples\n"
"--------\n"
" - Using sockets connect to a debugger at a specific address:\n"
" java " AGENTLIB "=transport=dt_socket,address=localhost:8000 ...\n"
" - Using sockets listen for a debugger to attach:\n"
" java " AGENTLIB "=transport=dt_socket,server=y,suspend=y ...\n"
"\n"
"Notes\n"
"-----\n"
" - A timeout value of 0 (the default) is no timeout.\n"
"\n"
"Warnings\n"
"--------\n"
" - The older " XRUN " interface can still be used, but will be removed in\n"
" a future release, for example:\n"
" java " XRUN ":[help]|[<option>=<value>, ...]\n"
));
#ifdef DEBUG
TTY_MESSAGE((
"\n"
"Debugging Options Description Default\n"
"----------------- ----------- -------\n"
"pause=y|n pause to debug PID n\n"
"coredump=y|n coredump at exit n\n"
"errorexit=y|n exit on any error n\n"
"logfile=filename name of log file none\n"
"logflags=flags log flags (bitmask) none\n"
" JVM calls = 0x001\n"
" JNI calls = 0x002\n"
" JVMTI calls = 0x004\n"
" misc events = 0x008\n"
" step logs = 0x010\n"
" locations = 0x020\n"
" callbacks = 0x040\n"
" errors = 0x080\n"
" everything = 0xfff"));
TTY_MESSAGE((
"debugflags=flags debug flags (bitmask) none\n"
" USE_ITERATE_THROUGH_HEAP 0x01\n"
"\n"
"Environment Variables\n"
"---------------------\n"
"_JAVA_JDWP_OPTIONS\n"
" Options can be added externally via this environment variable.\n"
" Anything contained in it will get a comma prepended to it (if needed),\n"
" then it will be added to the end of the options supplied via the\n"
" " XRUN " or " AGENTLIB " command line option.\n"
));
#endif
}
static jboolean checkAddress(void *bagItem, void *arg)
{
TransportSpec *spec = (TransportSpec *)bagItem;
if (spec->address == NULL) {
ERROR_MESSAGE(("JDWP Non-server transport %s must have a connection "
"address specified through the 'address=' option",
spec->name));
return JNI_FALSE;
} else {
return JNI_TRUE;
}
}
static char *
add_to_options(char *options, char *new_options)
{
size_t originalLength;
char *combinedOptions;
/*
* Allocate enough space for both strings and
* comma in between.
*/
originalLength = strlen(options);
combinedOptions = jvmtiAllocate((jint)originalLength + 1 +
(jint)strlen(new_options) + 1);
if (combinedOptions == NULL) {
return NULL;
}
(void)strcpy(combinedOptions, options);
(void)strcat(combinedOptions, ",");
(void)strcat(combinedOptions, new_options);
return combinedOptions;
}
static jboolean
get_boolean(char **pstr, jboolean *answer)
{
char buf[80];
*answer = JNI_FALSE;
/*LINTED*/
if (get_tok(pstr, buf, (int)sizeof(buf), ',')) {
if (strcmp(buf, "y") == 0) {
*answer = JNI_TRUE;
return JNI_TRUE;
} else if (strcmp(buf, "n") == 0) {
*answer = JNI_FALSE;
return JNI_TRUE;
}
}
return JNI_FALSE;
}
/* atexit() callback */
static void
atexit_finish_logging(void)
{
/* Normal exit(0) (not _exit()) may only reach here */
finish_logging(); /* Only first call matters */
}
static jboolean
parseOptions(char *options)
{
TransportSpec *currentTransport = NULL;
char *end;
char *current;
int length;
char *str;
char *errmsg;
jboolean onJcmd = JNI_FALSE;
/* Set defaults */
gdata->assertOn = DEFAULT_ASSERT_ON;
gdata->assertFatal = DEFAULT_ASSERT_FATAL;
logfile = DEFAULT_LOGFILE;
/* Options being NULL will end up being an error. */
if (options == NULL) {
options = "";
}
/* Check for "help" BEFORE we add any environmental settings */
if ((strcmp(options, "help")) == 0) {
printUsage();
forceExit(0); /* Kill entire process, no core dump wanted */
}
/* These buffers are never freed */
{
char *envOptions;
/*
* Add environmentally specified options.
*/
envOptions = getenv("_JAVA_JDWP_OPTIONS");
if (envOptions != NULL) {
options = add_to_options(options, envOptions);
if ( options==NULL ) {
EXIT_ERROR(AGENT_ERROR_OUT_OF_MEMORY,"options");
}
}
/*
* Allocate a buffer for names derived from option strings. It should
* never be longer than the original options string itself.
* Also keep a copy of the options in gdata->options.
*/
length = (int)strlen(options);
gdata->options = jvmtiAllocate(length + 1);
if (gdata->options == NULL) {
EXIT_ERROR(AGENT_ERROR_OUT_OF_MEMORY,"options");
}
(void)strcpy(gdata->options, options);
names = jvmtiAllocate(length + 1);
if (names == NULL) {
EXIT_ERROR(AGENT_ERROR_OUT_OF_MEMORY,"options");
}
transports = bagCreateBag(sizeof(TransportSpec), 3);
if (transports == NULL) {
EXIT_ERROR(AGENT_ERROR_OUT_OF_MEMORY,"transports");
}
}
current = names;
end = names + length;
str = options;
while (*str) {
char buf[100];
/*LINTED*/
if (!get_tok(&str, buf, (int)sizeof(buf), '=')) {
goto syntax_error;
}
if (strcmp(buf, "transport") == 0) {
currentTransport = bagAdd(transports);
/*LINTED*/
if (!get_tok(&str, current, (int)(end - current), ',')) {
goto syntax_error;
}
currentTransport->name = current;
currentTransport->address = NULL;
currentTransport->allow = NULL;
currentTransport->timeout = 0L;
current += strlen(current) + 1;
} else if (strcmp(buf, "address") == 0) {
if (currentTransport == NULL) {
errmsg = "address specified without transport";
goto bad_option_with_errmsg;
}
/*LINTED*/
if (!get_tok(&str, current, (int)(end - current), ',')) {
goto syntax_error;
}
currentTransport->address = current;
current += strlen(current) + 1;
} else if (strcmp(buf, "allow") == 0) {
if (currentTransport == NULL) {
errmsg = "allow specified without transport";
goto bad_option_with_errmsg;
}
/*LINTED*/
if (!get_tok(&str, current, (int)(end - current), ',')) {
goto syntax_error;
}
currentTransport->allow = current;
current += strlen(current) + 1;
} else if (strcmp(buf, "timeout") == 0) {
if (currentTransport == NULL) {
errmsg = "timeout specified without transport";
goto bad_option_with_errmsg;
}
/*LINTED*/
if (!get_tok(&str, current, (int)(end - current), ',')) {
goto syntax_error;
}
currentTransport->timeout = atol(current);
current += strlen(current) + 1;
} else if (strcmp(buf, "launch") == 0) {
/*LINTED*/
if (!get_tok(&str, current, (int)(end - current), ',')) {
goto syntax_error;
}
launchOnInit = current;
current += strlen(current) + 1;
} else if (strcmp(buf, "onthrow") == 0) {
/* Read class name and convert in place to a signature */
*current = 'L';
/*LINTED*/
if (!get_tok(&str, current + 1, (int)(end - current - 1), ',')) {
goto syntax_error;
}
initOnException = current;
while (*current != '\0') {
if (*current == '.') {
*current = '/';
}
current++;
}
*current++ = ';';
*current++ = '\0';
} else if (strcmp(buf, "assert") == 0) {
/*LINTED*/
if (!get_tok(&str, current, (int)(end - current), ',')) {
goto syntax_error;
}
if (strcmp(current, "y") == 0) {
gdata->assertOn = JNI_TRUE;
gdata->assertFatal = JNI_FALSE;
} else if (strcmp(current, "fatal") == 0) {
gdata->assertOn = JNI_TRUE;
gdata->assertFatal = JNI_TRUE;
} else if (strcmp(current, "n") == 0) {
gdata->assertOn = JNI_FALSE;
gdata->assertFatal = JNI_FALSE;
} else {
goto syntax_error;
}
current += strlen(current) + 1;
} else if (strcmp(buf, "pause") == 0) {
if ( !get_boolean(&str, &dopause) ) {
goto syntax_error;
}
if ( dopause ) {
do_pause();
}
} else if (strcmp(buf, "coredump") == 0) {
if ( !get_boolean(&str, &docoredump) ) {
goto syntax_error;
}
} else if (strcmp(buf, "errorexit") == 0) {
if ( !get_boolean(&str, &(gdata->doerrorexit)) ) {
goto syntax_error;
}
} else if (strcmp(buf, "exitpause") == 0) {
errmsg = "The exitpause option removed, use -XX:OnError";
goto bad_option_with_errmsg;
} else if (strcmp(buf, "precrash") == 0) {
errmsg = "The precrash option removed, use -XX:OnError";
goto bad_option_with_errmsg;
} else if (strcmp(buf, "logfile") == 0) {
/*LINTED*/
if (!get_tok(&str, current, (int)(end - current), ',')) {
goto syntax_error;
}
logfile = current;
current += strlen(current) + 1;
} else if (strcmp(buf, "logflags") == 0) {
/*LINTED*/
if (!get_tok(&str, current, (int)(end - current), ',')) {
goto syntax_error;
}
/*LINTED*/
logflags = (unsigned)strtol(current, NULL, 0);
} else if (strcmp(buf, "debugflags") == 0) {
/*LINTED*/
if (!get_tok(&str, current, (int)(end - current), ',')) {
goto syntax_error;
}
/*LINTED*/
gdata->debugflags = (unsigned)strtol(current, NULL, 0);
} else if ( strcmp(buf, "suspend")==0 ) {
if ( !get_boolean(&str, &suspendOnInit) ) {
goto syntax_error;
}
} else if ( strcmp(buf, "server")==0 ) {
if ( !get_boolean(&str, &isServer) ) {
goto syntax_error;
}
} else if ( strcmp(buf, "strict")==0 ) { /* Obsolete, but accept it */
if ( !get_boolean(&str, &isStrict) ) {
goto syntax_error;
}
} else if ( strcmp(buf, "quiet")==0 ) {
if ( !get_boolean(&str, &(gdata->quiet)) ) {
goto syntax_error;
}
} else if ( strcmp(buf, "onuncaught")==0 ) {
if ( !get_boolean(&str, &initOnUncaught) ) {
goto syntax_error;
}
} else if ( strcmp(buf, "mutf8")==0 ) {
if ( !get_boolean(&str, &(gdata->modifiedUtf8)) ) {
goto syntax_error;
}
} else if ( strcmp(buf, "stdalloc")==0 ) { /* Obsolete, but accept it */
if ( !get_boolean(&str, &useStandardAlloc) ) {
goto syntax_error;
}
} else if (strcmp(buf, "onjcmd") == 0) {
if (!get_boolean(&str, &onJcmd)) {
goto syntax_error;
}
} else {
goto syntax_error;
}
}
/* Setup logging now */
if ( logfile!=NULL ) {
setup_logging(logfile, logflags);
(void)atexit(&atexit_finish_logging);
}
if (bagSize(transports) == 0) {
errmsg = "no transport specified";
goto bad_option_with_errmsg;
}
/*
/**代码未完, 请加载全部代码(NowJava.com).**/
关注时代Java
关注时代Java