/* * Copyright (c) 2002, 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. * * 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 "salibproc.h" #include "sun_jvm_hotspot_debugger_proc_ProcDebuggerLocal.h" #include #include #include #include #include #include #include #include "cds.h" #define CHECK_EXCEPTION_(value) if(env->ExceptionOccurred()) { return value; } #define CHECK_EXCEPTION if(env->ExceptionOccurred()) { return;} #define THROW_NEW_DEBUGGER_EXCEPTION_(str, value) { throwNewDebuggerException(env, str); return value; } #define THROW_NEW_DEBUGGER_EXCEPTION(str) { throwNewDebuggerException(env, str); return;} #define SYMBOL_BUF_SIZE 256 #define ERR_MSG_SIZE (PATH_MAX + 256) // debug modes static int _libsaproc_debug = 0; static void print_debug(const char* format,...) { if (_libsaproc_debug) { va_list alist; va_start(alist, format); fputs("libsaproc DEBUG: ", stderr); vfprintf(stderr, format, alist); va_end(alist); } } struct Debugger { JNIEnv* env; jobject this_obj; }; struct DebuggerWithObject : Debugger { jobject obj; }; struct DebuggerWith2Objects : DebuggerWithObject { jobject obj2; }; /* * Portions of user thread level detail gathering code is from pstack source * code. See pstack.c in Solaris 2.8 user commands source code. */ static void throwNewDebuggerException(JNIEnv* env, const char* errMsg) { jclass clazz = env->FindClass("sun/jvm/hotspot/debugger/DebuggerException"); CHECK_EXCEPTION; env->ThrowNew(clazz, errMsg); } // JNI ids for some fields, methods // libproc handler pointer static jfieldID p_ps_prochandle_ID = 0; // libthread.so dlopen handle, thread agent ptr and function pointers static jfieldID libthread_db_handle_ID = 0; static jfieldID p_td_thragent_t_ID = 0; static jfieldID p_td_init_ID = 0; static jfieldID p_td_ta_new_ID = 0; static jfieldID p_td_ta_delete_ID = 0; static jfieldID p_td_ta_thr_iter_ID = 0; static jfieldID p_td_thr_get_info_ID = 0; static jfieldID p_td_ta_map_id2thr_ID = 0; static jfieldID p_td_thr_getgregs_ID = 0; // reg index fields static jfieldID pcRegIndex_ID = 0; static jfieldID fpRegIndex_ID = 0; // part of the class sharing workaround static jfieldID classes_jsa_fd_ID = 0; static jfieldID p_file_map_header_ID = 0; // method ids static jmethodID getThreadForThreadId_ID = 0; static jmethodID createSenderFrame_ID = 0; static jmethodID createLoadObject_ID = 0; static jmethodID createClosestSymbol_ID = 0; static jmethodID listAdd_ID = 0; /* * Functions we need from libthread_db */ typedef td_err_e (*p_td_init_t)(void); typedef td_err_e (*p_td_ta_new_t)(void *, td_thragent_t **); typedef td_err_e (*p_td_ta_delete_t)(td_thragent_t *); typedef td_err_e (*p_td_ta_thr_iter_t)(const td_thragent_t *, td_thr_iter_f *, void *, td_thr_state_e, int, sigset_t *, unsigned); typedef td_err_e (*p_td_thr_get_info_t)(const td_thrhandle_t *, td_thrinfo_t *); typedef td_err_e (*p_td_ta_map_id2thr_t)(const td_thragent_t *, thread_t, td_thrhandle_t *); typedef td_err_e (*p_td_thr_getgregs_t)(const td_thrhandle_t *, prgregset_t); static void clear_libthread_db_ptrs(JNIEnv* env, jobject this_obj) { // release libthread_db agent, if we had created p_td_ta_delete_t p_td_ta_delete = 0; p_td_ta_delete = (p_td_ta_delete_t) env->GetLongField(this_obj, p_td_ta_delete_ID); td_thragent_t *p_td_thragent_t = 0; p_td_thragent_t = (td_thragent_t*) env->GetLongField(this_obj, p_td_thragent_t_ID); if (p_td_thragent_t != 0 && p_td_ta_delete != 0) { p_td_ta_delete(p_td_thragent_t); } // dlclose libthread_db.so void* libthread_db_handle = (void*) env->GetLongField(this_obj, libthread_db_handle_ID); if (libthread_db_handle != 0) { dlclose(libthread_db_handle); } env->SetLongField(this_obj, libthread_db_handle_ID, (jlong)0); env->SetLongField(this_obj, p_td_init_ID, (jlong)0); env->SetLongField(this_obj, p_td_ta_new_ID, (jlong)0); env->SetLongField(this_obj, p_td_ta_delete_ID, (jlong)0); env->SetLongField(this_obj, p_td_ta_thr_iter_ID, (jlong)0); env->SetLongField(this_obj, p_td_thr_get_info_ID, (jlong)0); env->SetLongField(this_obj, p_td_ta_map_id2thr_ID, (jlong)0); env->SetLongField(this_obj, p_td_thr_getgregs_ID, (jlong)0); } static void detach_internal(JNIEnv* env, jobject this_obj) { // clear libthread_db stuff clear_libthread_db_ptrs(env, this_obj); // release ptr to ps_prochandle jlong p_ps_prochandle; p_ps_prochandle = env->GetLongField(this_obj, p_ps_prochandle_ID); if (p_ps_prochandle != 0L) { Prelease((struct ps_prochandle*) p_ps_prochandle, PRELEASE_CLEAR); } // part of the class sharing workaround int classes_jsa_fd = env->GetIntField(this_obj, classes_jsa_fd_ID); if (classes_jsa_fd != -1) { close(classes_jsa_fd); CDSFileMapHeaderBase* pheader = (CDSFileMapHeaderBase*) env->GetLongField(this_obj, p_file_map_header_ID); if (pheader != NULL) { free(pheader); } } } // Is it okay to ignore libthread_db failure? Set env var to ignore // libthread_db failure. You can still debug, but will miss threads // related functionality. static bool sa_ignore_threaddb = (getenv("SA_IGNORE_THREADDB") != 0); #define HANDLE_THREADDB_FAILURE(msg) \ if (sa_ignore_threaddb) { \ printf("libsaproc WARNING: %s\n", msg); \ return; \ } else { \ THROW_NEW_DEBUGGER_EXCEPTION(msg); \ } #define HANDLE_THREADDB_FAILURE_(msg, ret) \ if (sa_ignore_threaddb) { \ printf("libsaproc WARNING: %s\n", msg); \ return ret; \ } else { \ THROW_NEW_DEBUGGER_EXCEPTION_(msg, ret); \ } static const char * alt_root = NULL; static int alt_root_len = -1; #define SA_ALTROOT "SA_ALTROOT" static void init_alt_root() { if (alt_root_len == -1) { alt_root = getenv(SA_ALTROOT); if (alt_root) alt_root_len = strlen(alt_root); else alt_root_len = 0; } } // This function is a complete substitute for the open system call // since it's also used to override open calls from libproc to // implement as a pathmap style facility for the SA. If libproc // starts using other interfaces then this might have to extended to // cover other calls. extern "C" JNIEXPORT int JNICALL libsaproc_open(const char * name, int oflag, ...) { if (oflag == O_RDONLY) { init_alt_root(); if (_libsaproc_debug) { printf("libsaproc DEBUG: libsaproc_open %s\n", name); } if (alt_root_len > 0) { int fd = -1; char alt_path[PATH_MAX+1]; strcpy(alt_path, alt_root); strcat(alt_path, name); fd = open(alt_path, O_RDONLY); if (fd >= 0) { if (_libsaproc_debug) { printf("libsaproc DEBUG: libsaproc_open substituted %s\n", alt_path); } return fd; } if (strrchr(name, '/')) { strcpy(alt_path, alt_root); strcat(alt_path, strrchr(name, '/')); fd = open(alt_path, O_RDONLY); if (fd >= 0) { if (_libsaproc_debug) { printf("libsaproc DEBUG: libsaproc_open substituted %s\n", alt_path); } return fd; } } } } { mode_t mode; va_list ap; va_start(ap, oflag); mode = va_arg(ap, mode_t); va_end(ap); return open(name, oflag, mode); } } static void * pathmap_dlopen(const char * name, int mode) { init_alt_root(); if (_libsaproc_debug) { printf("libsaproc DEBUG: pathmap_dlopen %s\n", name); } void * handle = NULL; if (alt_root_len > 0) { char alt_path[PATH_MAX+1]; strcpy(alt_path, alt_root); strcat(alt_path, name); handle = dlopen(alt_path, mode); if (_libsaproc_debug && handle) { printf("libsaproc DEBUG: pathmap_dlopen substituted %s\n", alt_path); } if (handle == NULL && strrchr(name, '/')) { strcpy(alt_path, alt_root); strcat(alt_path, strrchr(name, '/')); handle = dlopen(alt_path, mode); if (_libsaproc_debug && handle) { printf("libsaproc DEBUG: pathmap_dlopen substituted %s\n", alt_path); } } } if (handle == NULL) { handle = dlopen(name, mode); } if (_libsaproc_debug) { printf("libsaproc DEBUG: pathmap_dlopen %s return 0x%lx\n", name, (unsigned long) handle); } return handle; } // libproc and libthread_db callback functions extern "C" { static int init_libthread_db_ptrs(void *cd, const prmap_t *pmp, const char *object_name) { Debugger* dbg = (Debugger*) cd; JNIEnv* env = dbg->env; jobject this_obj = dbg->this_obj; struct ps_prochandle* ph = (struct ps_prochandle*) env->GetLongField(this_obj, p_ps_prochandle_ID); char *s1 = 0, *s2 = 0; char libthread_db[PATH_MAX]; if (strstr(object_name, "/libthread.so.") == NULL) return (0); /* * We found a libthread. * dlopen() the matching libthread_db and get the thread agent handle. */ if (Pstatus(ph)->pr_dmodel == PR_MODEL_NATIVE) { (void) strcpy(libthread_db, object_name); s1 = (char*) strstr(object_name, ".so."); s2 = (char*) strstr(libthread_db, ".so."); (void) strcpy(s2, "_db"); s2 += 3; (void) strcpy(s2, s1); } else { #ifdef _LP64 /* * The victim process is 32-bit, we are 64-bit. * We have to find the 64-bit version of libthread_db * that matches the victim's 32-bit version of libthread. */ (void) strcpy(libthread_db, object_name); s1 = (char*) strstr(object_name, "/libthread.so."); s2 = (char*) strstr(libthread_db, "/libthread.so."); (void) strcpy(s2, "/64"); s2 += 3; (void) strcpy(s2, s1); s1 = (char*) strstr(s1, ".so."); s2 = (char*) strstr(s2, ".so."); (void) strcpy(s2, "_db"); s2 += 3; (void) strcpy(s2, s1); #else return (0); #endif /* _LP64 */ } void* libthread_db_handle = 0; if ((libthread_db_handle = pathmap_dlopen(libthread_db, RTLD_LAZY|RTLD_LOCAL)) == NULL) { char errMsg[PATH_MAX + 256]; sprintf(errMsg, "Can't load %s!", libthread_db); HANDLE_THREADDB_FAILURE_(errMsg, 0); } env->SetLongField(this_obj, libthread_db_handle_ID, (jlong)(uintptr_t)libthread_db_handle); void* tmpPtr = 0; tmpPtr = dlsym(libthread_db_handle, "td_init"); if (tmpPtr == 0) { HANDLE_THREADDB_FAILURE_("dlsym failed on td_init!", 0); } env->SetLongField(this_obj, p_td_init_ID, (jlong)(uintptr_t) tmpPtr); tmpPtr =dlsym(libthread_db_handle, "td_ta_new"); if (tmpPtr == 0) { HANDLE_THREADDB_FAILURE_("dlsym failed on td_ta_new!", 0); } env->SetLongField(this_obj, p_td_ta_new_ID, (jlong)(uintptr_t) tmpPtr); tmpPtr = dlsym(libthread_db_handle, "td_ta_delete"); if (tmpPtr == 0) { HANDLE_THREADDB_FAILURE_("dlsym failed on td_ta_delete!", 0); } env->SetLongField(this_obj, p_td_ta_delete_ID, (jlong)(uintptr_t) tmpPtr); tmpPtr = dlsym(libthread_db_handle, "td_ta_thr_iter"); if (tmpPtr == 0) { HANDLE_THREADDB_FAILURE_("dlsym failed on td_ta_thr_iter!", 0); } env->SetLongField(this_obj, p_td_ta_thr_iter_ID, (jlong)(uintptr_t) tmpPtr); tmpPtr = dlsym(libthread_db_handle, "td_thr_get_info"); if (tmpPtr == 0) { HANDLE_THREADDB_FAILURE_("dlsym failed on td_thr_get_info!", 0); } env->SetLongField(this_obj, p_td_thr_get_info_ID, (jlong)(uintptr_t) tmpPtr); tmpPtr = dlsym(libthread_db_handle, "td_ta_map_id2thr"); if (tmpPtr == 0) { HANDLE_THREADDB_FAILURE_("dlsym failed on td_ta_map_id2thr!", 0); } env->SetLongField(this_obj, p_td_ta_map_id2thr_ID, (jlong)(uintptr_t) tmpPtr); tmpPtr = dlsym(libthread_db_handle, "td_thr_getgregs"); if (tmpPtr == 0) { HANDLE_THREADDB_FAILURE_("dlsym failed on td_thr_getgregs!", 0); } env->SetLongField(this_obj, p_td_thr_getgregs_ID, (jlong)(uintptr_t) tmpPtr); return 1; } static int fill_thread_list(const td_thrhandle_t *p_td_thragent_t, void* cd) { DebuggerWithObject* dbgo = (DebuggerWithObject*) cd; JNIEnv* env = dbgo->env; jobject this_obj = dbgo->this_obj; jobject list = dbgo->obj; td_thrinfo_t thrinfo; p_td_thr_get_info_t p_td_thr_get_info = (p_td_thr_get_info_t) env->GetLongField(this_obj, p_td_thr_get_info_ID); if (p_td_thr_get_info(p_td_thragent_t, &thrinfo) != TD_OK) return (0); jobject threadProxy = env->CallObjectMethod(this_obj, getThreadForThreadId_ID, (jlong)(uintptr_t) thrinfo.ti_tid); CHECK_EXCEPTION_(1); env->CallBooleanMethod(list, listAdd_ID, threadProxy); CHECK_EXCEPTION_(1); return 0; } static int fill_load_object_list(void *cd, const prmap_t* pmp, const char* obj_name) { if (obj_name) { DebuggerWithObject* dbgo = (DebuggerWithObject*) cd; JNIEnv* env = dbgo->env; jobject this_obj = dbgo->this_obj; jobject list = dbgo->obj; jstring objectName = env->NewStringUTF(obj_name); CHECK_EXCEPTION_(1); jlong mapSize = (jlong) pmp->pr_size; jobject sharedObject = env->CallObjectMethod(this_obj, createLoadObject_ID, objectName, mapSize, (jlong)(uintptr_t)pmp->pr_vaddr); CHECK_EXCEPTION_(1); env->CallBooleanMethod(list, listAdd_ID, sharedObject); CHECK_EXCEPTION_(1); } return 0; } // Pstack_iter() proc_stack_f callback prior to Nevada-B159 static int fill_cframe_list(void *cd, const prgregset_t regs, uint_t argc, const long *argv) { DebuggerWith2Objects* dbgo2 = (DebuggerWith2Objects*) cd; JNIEnv* env = dbgo2->env; jobject this_obj = dbgo2->this_obj; jobject curFrame = dbgo2->obj2; jint pcRegIndex = env->GetIntField(this_obj, pcRegIndex_ID); jint fpRegIndex = env->GetIntField(this_obj, fpRegIndex_ID); jlong pc = (jlong) (uintptr_t) regs[pcRegIndex]; jlong fp = (jlong) (uintptr_t) regs[fpRegIndex]; dbgo2->obj2 = env->CallObjectMethod(this_obj, createSenderFrame_ID, curFrame, pc, fp); CHECK_EXCEPTION_(1); if (dbgo2->obj == 0) { dbgo2->obj = dbgo2->obj2; } return 0; } // Pstack_iter() proc_stack_f callback in Nevada-B159 or later /*ARGSUSED*/ static int wrapper_fill_cframe_list(void *cd, const prgregset_t regs, uint_t argc, const long *argv, int frame_flags, int sig) { return(fill_cframe_list(cd, regs, argc, argv)); } //--------------------------------------------------------------- // Part of the class sharing workaround: // // With class sharing, pages are mapped from classes.jsa file. // The read-only class sharing pages are mapped as MAP_SHARED, // PROT_READ pages. These pages are not dumped into core dump. // With this workaround, these pages are read from classes.jsa. static bool read_jboolean(struct ps_prochandle* ph, psaddr_t addr, jboolean* pvalue) { jboolean i; if (ps_pread(ph, addr, &i, sizeof(i)) == PS_OK) { *pvalue = i; return true; } else { return false; } } static bool read_pointer(struct ps_prochandle* ph, psaddr_t addr, uintptr_t* pvalue) { uintptr_t uip; if (ps_pread(ph, addr, &uip, sizeof(uip)) == PS_OK) { *pvalue = uip; return true; } else { return false; } } static bool read_string(struct ps_prochandle* ph, psaddr_t addr, char* buf, size_t size) { char ch = ' '; size_t i = 0; while (ch != '\0') { if (ps_pread(ph, addr, &ch, sizeof(ch)) != PS_OK) return false; if (i < size - 1) { buf[i] = ch; } else { // smaller buffer return false; } i++; addr++; } buf[i] = '\0'; return true; } #define USE_SHARED_SPACES_SYM "UseSharedSpaces" // mangled symbol name for Arguments::SharedArchivePath #define SHARED_ARCHIVE_PATH_SYM "__1cJArgumentsRSharedArchivePath_" static int init_classsharing_workaround(void *cd, const prmap_t* pmap, const char* obj_name) { Debugger* dbg = (Debugger*) cd; JNIEnv* env = dbg->env; jobject this_obj = dbg->this_obj; const char* jvm_name = 0; if ((jvm_name = strstr(obj_name, "libjvm.so")) != NULL) { jvm_name = obj_name; } else { return 0; } struct ps_prochandle* ph = (struct ps_prochandle*) env->GetLongField(this_obj, p_ps_prochandle_ID); // initialize classes.jsa file descriptor field. dbg->env->SetIntField(this_obj, classes_jsa_fd_ID, -1); // check whether class sharing is on by reading variable "UseSharedSpaces" psaddr_t useSharedSpacesAddr = 0; ps_pglobal_lookup(ph, jvm_name, USE_SHARED_SPACES_SYM, &useSharedSpacesAddr); if (useSharedSpacesAddr == 0) { THROW_NEW_DEBUGGER_EXCEPTION_("can't find 'UseSharedSpaces' flag\n", 1); } // read the value of the flag "UseSharedSpaces" // Since hotspot types are not available to build this library. So // equivalent type "jboolean" is used to read the value of "UseSharedSpaces" // which is same as hotspot type "bool". jboolean value = 0; if (read_jboolean(ph, useSharedSpacesAddr, &value) != true) { THROW_NEW_DEBUGGER_EXCEPTION_("can't read 'UseSharedSpaces' flag", 1); } else if ((int)value == 0) { print_debug("UseSharedSpaces is false, assuming -Xshare:off!\n"); return 1; } char classes_jsa[PATH_MAX]; psaddr_t sharedArchivePathAddrAddr = 0; ps_pglobal_lookup(ph, jvm_name, SHARED_ARCHIVE_PATH_SYM, &sharedArchivePathAddrAddr); if (sharedArchivePathAddrAddr == 0) { print_debug("can't find symbol 'Arguments::SharedArchivePath'\n"); THROW_NEW_DEBUGGER_EXCEPTION_("can't get shared archive path from debuggee", 1); } uintptr_t sharedArchivePathAddr = 0; if (read_pointer(ph, sharedArchivePathAddrAddr, &sharedArchivePathAddr) != true) { print_debug("can't find read pointer 'Arguments::SharedArchivePath'\n"); THROW_NEW_DEBUGGER_EXCEPTION_("can't get shared archive path from debuggee", 1); } if (read_string(ph, (psaddr_t)sharedArchivePathAddr, classes_jsa, sizeof(classes_jsa)) != true) { print_debug("can't find read 'Arguments::SharedArchivePath' value\n"); THROW_NEW_DEBUGGER_EXCEPTION_("can't get shared archive path from debuggee", 1); } print_debug("looking for %s\n", classes_jsa); // open the classes.jsa int fd = libsaproc_open(classes_jsa, O_RDONLY); if (fd < 0) { char errMsg[ERR_MSG_SIZE]; sprintf(errMsg, "can't open shared archive file %s", classes_jsa); THROW_NEW_DEBUGGER_EXCEPTION_(errMsg, 1); } else { print_debug("opened shared archive file %s\n", classes_jsa); } // parse classes.jsa CDSFileMapHeaderBase* pheader = (CDSFileMapHeaderBase*) malloc(sizeof(CDSFileMapHeaderBase)); if (pheader == NULL) { close(fd); THROW_NEW_DEBUGGER_EXCEPTION_("can't allocate memory for shared file map header", 1); } memset(pheader, 0, sizeof(CDSFileMapHeaderBase)); // read CDSFileMapHeaderBase size_t n = read(fd, pheader, sizeof(CDSFileMapHeaderBase)); if (n != sizeof(CDSFileMapHeaderBase)) { char errMsg[ERR_MSG_SIZE]; sprintf(errMsg, "unable to read shared archive file map header from %s", classes_jsa); close(fd); free(pheader); THROW_NEW_DEBUGGER_EXCEPTION_(errMsg, 1); } // check file magic if (pheader->_magic != CDS_ARCHIVE_MAGIC) { char errMsg[ERR_MSG_SIZE]; sprintf(errMsg, "%s has bad shared archive magic 0x%x, expecting 0x%x", classes_jsa, pheader->_magic, CDS_ARCHIVE_MAGIC); close(fd); free(pheader); THROW_NEW_DEBUGGER_EXCEPTION_(errMsg, 1); } // check version if (pheader->_version != CURRENT_CDS_ARCHIVE_VERSION) { char errMsg[ERR_MSG_SIZE]; sprintf(errMsg, "%s has wrong shared archive version %d, expecting %d", classes_jsa, pheader->_version, CURRENT_CDS_ARCHIVE_VERSION); close(fd); free(pheader); THROW_NEW_DEBUGGER_EXCEPTION_(errMsg, 1); } if (_libsaproc_debug) { for (int m = 0; m < NUM_CDS_REGIONS; m++) { print_debug("shared file offset %d mapped at 0x%lx, size = %ld, read only? = %d\n", pheader->_space[m]._file_offset, pheader->_space[m]._addr._base, pheader->_space[m]._used, pheader->_space[m]._read_only); } } // FIXME: For now, omitting other checks such as VM version etc. // store class archive file fd and map header in debugger object fields dbg->env->SetIntField(this_obj, classes_jsa_fd_ID, fd); dbg->env->SetLongField(this_obj, p_file_map_header_ID, (jlong)(uintptr_t) pheader); return 1; } } // extern "C" // error messages for proc_arg_grab failure codes. The messages are // modified versions of comments against corresponding #defines in // libproc.h. static const char* proc_arg_grab_errmsgs[] = { "", /* G_NOPROC */ "No such process", /* G_NOCORE */ "No such core file", /* G_NOPROCORCORE */ "No such process or core", /* G_NOEXEC */ "Cannot locate executable file", /* G_ZOMB */ "Zombie processs", /* G_PERM */ "No permission to attach", /* G_BUSY */ "Another process has already attached", /* G_SYS */ "System process - can not attach", /* G_SELF */ "Process is self - can't debug myself!", /* G_INTR */ "Interrupt received while grabbing", /* G_LP64 */ "debuggee is 64 bit, use java -d64 for debugger", /* G_FORMAT */ "File is not an ELF format core file - corrupted core?", /* G_ELF */ "Libelf error while parsing an ELF file", /* G_NOTE */ "Required PT_NOTE Phdr not present - corrupted core?", }; static void attach_internal(JNIEnv* env, jobject this_obj, jstring cmdLine, jboolean isProcess) { jboolean isCopy; int gcode; const char* cmdLine_cstr = env->GetStringUTFChars(cmdLine, &isCopy); char errMsg[ERR_MSG_SIZE]; td_err_e te; CHECK_EXCEPTION; if (cmdLine_cstr == NULL) { return; } // some older versions of libproc.so crash when trying to attach 32 bit // debugger to 64 bit core file. check and throw error. #ifndef _LP64 errno = 0; strtol(cmdLine_cstr, NULL, 10); if (errno) { // core file int core_fd; if ((core_fd = open64(cmdLine_cstr, O_RDONLY)) >= 0) { Elf32_Ehdr e32; if (pread64(core_fd, &e32, sizeof (e32), 0) == sizeof (e32) && memcmp(&e32.e_ident[EI_MAG0], ELFMAG, SELFMAG) == 0 && e32.e_type == ET_CORE && e32.e_ident[EI_CLASS] == ELFCLASS64) { close(core_fd); env->ReleaseStringUTFChars(cmdLine, cmdLine_cstr); THROW_NEW_DEBUGGER_EXCEPTION("debuggee is 64 bit, use java -d64 for debugger"); } close(core_fd); } // all other conditions are handled by libproc.so. } #endif // connect to process/core ps_prochandle_t* ph = proc_arg_grab(cmdLine_cstr, (isProcess? PR_ARG_PIDS : PR_ARG_CORES), PGRAB_FORCE, &gcode, NULL); env->ReleaseStringUTFChars(cmdLine, cmdLine_cstr); if (! ph) { if (gcode > 0 && gcode < sizeof(proc_arg_grab_errmsgs)/sizeof(const char*)) { snprintf(errMsg, ERR_MSG_SIZE, "Attach failed : %s", proc_arg_grab_errmsgs[gcode]); THROW_NEW_DEBUGGER_EXCEPTION(errMsg); } else { if (_libsaproc_debug && gcode == G_STRANGE) { perror("libsaproc DEBUG: "); } if (isProcess) { THROW_NEW_DEBUGGER_EXCEPTION("Not able to attach to process!"); } else { THROW_NEW_DEBUGGER_EXCEPTION("Not able to attach to core file!"); } } } // even though libproc.so supports 64 bit debugger and 32 bit debuggee, we don't // support such cross-bit-debugging. check for that combination and throw error. #ifdef _LP64 int data_model; if (ps_pdmodel(ph, &data_model) != PS_OK) { Prelease(ph, PRELEASE_CLEAR); THROW_NEW_DEBUGGER_EXCEPTION("can't determine debuggee data model (ILP32? or LP64?)"); } if (data_model == PR_MODEL_ILP32) { Prelease(ph, PRELEASE_CLEAR); THROW_NEW_DEBUGGER_EXCEPTION("debuggee is 32 bit, use 32 bit java for debugger"); } #endif env->SetLongField(this_obj, p_ps_prochandle_ID, (jlong)(uintptr_t)ph); Debugger dbg; dbg.env = env; dbg.this_obj = this_obj; jthrowable exception = 0; if (! isProcess) { /* * With class sharing, shared perm. gen heap is allocated in with MAP_SHARED|PROT_READ. * These pages are mapped from the file "classes.jsa". MAP_SHARED pages are not dumped * in Solaris core.To read shared heap pages, we have to read classes.jsa file. */ Pobject_iter(ph, init_classsharing_workaround, &dbg); exception = env->ExceptionOccurred(); if (exception) { env->ExceptionClear(); detach_internal(env, this_obj); env->Throw(exception); return; } } /* * Iterate over the process mappings looking * for libthread and then dlopen the appropriate * libthread_db and get function pointers. */ Pobject_iter(ph, init_libthread_db_ptrs, &dbg); exception = env->ExceptionOccurred(); if (exception) { env->ExceptionClear(); if (!sa_ignore_threaddb) { detach_internal(env, this_obj); env->Throw(exception); } return; } // init libthread_db and create thread_db agent p_td_init_t p_td_init = (p_td_init_t) env->GetLongField(this_obj, p_td_init_ID); if (p_td_init == 0) { if (!sa_ignore_threaddb) { detach_internal(env, this_obj); } HANDLE_THREADDB_FAILURE("Did not find libthread in target process/core!"); } te = p_td_init(); if (te != TD_OK) { if (!sa_ignore_threaddb) { detach_internal(env, this_obj); } snprintf(errMsg, ERR_MSG_SIZE, "Can't initialize thread_db! td_init failed: %d", te); HANDLE_THREADDB_FAILURE(errMsg); } p_td_ta_new_t p_td_ta_new = (p_td_ta_new_t) env->GetLongField(this_obj, p_td_ta_new_ID); td_thragent_t *p_td_thragent_t = 0; te = p_td_ta_new(ph, &p_td_thragent_t); if (te != TD_OK) { if (!sa_ignore_threaddb) { detach_internal(env, this_obj); } snprintf(errMsg, ERR_MSG_SIZE, "Can't create thread_db agent! td_ta_new failed: %d", te); HANDLE_THREADDB_FAILURE(errMsg); } env->SetLongField(this_obj, p_td_thragent_t_ID, (jlong)(uintptr_t) p_td_thragent_t); } /* * Class: sun_jvm_hotspot_debugger_proc_ProcDebuggerLocal * Method: attach0 * Signature: (Ljava/lang/String;)V * Description: process detach */ JNIEXPORT void JNICALL Java_sun_jvm_hotspot_debugger_proc_ProcDebuggerLocal_attach0__Ljava_lang_String_2 (JNIEnv *env, jobject this_obj, jstring pid) { attach_internal(env, this_obj, pid, JNI_TRUE); } /* * Class: sun_jvm_hotspot_debugger_proc_ProcDebuggerLocal * Method: attach0 * Signature: (Ljava/lang/String;Ljava/lang/String;)V * Description: core file detach */ JNIEXPORT void JNICALL Java_sun_jvm_hotspot_debugger_proc_ProcDebuggerLocal_attach0__Ljava_lang_String_2Ljava_lang_String_2 (JNIEnv *env, jobject this_obj, jstring executable, jstring corefile) { // ignore executable file name, libproc.so can detect a.out name anyway. attach_internal(env, this_obj, corefile, JNI_FALSE); } /* * Class: sun_jvm_hotspot_debugger_proc_ProcDebuggerLocal * Method: detach0 * Signature: ()V * Description: process/core file detach */ JNIEXPORT void JNICALL Java_sun_jvm_hotspot_debugger_proc_ProcDebuggerLocal_detach0 (JNIEnv *env, jobject this_obj) { detach_internal(env, this_obj); } /* * Class: sun_jvm_hotspot_debugger_proc_ProcDebuggerLocal * Method: getRemoteProcessAddressSize0 * Signature: ()I * Description: get process/core address size */ JNIEXPORT jint JNICALL Java_sun_jvm_hotspot_debugger_proc_ProcDebuggerLocal_getRemoteProcessAddressSize0 (JNIEnv *env, jobject this_obj) { jlong p_ps_prochandle; p_ps_prochandle = env->GetLongField(this_obj, p_ps_prochandle_ID); int data_model = PR_MODEL_ILP32; ps_pdmodel((struct ps_prochandle*) p_ps_prochandle, &data_model); print_debug("debuggee is %d bit\n", data_model == PR_MODEL_ILP32? 32 : 64); return (jint) data_model == PR_MODEL_ILP32? 32 : 64; } /* * Class: sun_jvm_hotspot_debugger_proc_ProcDebuggerLocal * Method: getPageSize0 * Signature: ()I * Description: get process/core page size */ JNIEXPORT jint JNICALL Java_sun_jvm_hotspot_debugger_proc_ProcDebuggerLocal_getPageSize0 (JNIEnv *env, jobject this_obj) { /* We are not yet attached to a java process or core file. getPageSize is called from the constructor of ProcDebuggerLocal. The following won't work! jlong p_ps_prochandle; p_ps_prochandle = env->GetLongField(this_obj, p_ps_prochandle_ID); CHECK_EXCEPTION_(-1); struct ps_prochandle* prochandle = (struct ps_prochandle*) p_ps_prochandle; return (Pstate(prochandle) == PS_DEAD) ? Pgetauxval(prochandle, AT_PAGESZ) : getpagesize(); So even though core may have been generated with a different page size settings, for now call getpagesize. */ return getpagesize(); } /* * Class: sun_jvm_hotspot_debugger_proc_ProcDebuggerLocal * Method: getThreadIntegerRegisterSet0 * Signature: (J)[J * Description: get gregset for a given thread specified by thread id */ JNIEXPORT jlongArray JNICALL Java_sun_jvm_hotspot_debugger_proc_ProcDebuggerLocal_getThreadIntegerRegisterSet0 (JNIEnv *env, jobject this_obj, jlong tid) { char errMsg[ERR_MSG_SIZE]; td_err_e te; // map the thread id to thread handle p_td_ta_map_id2thr_t p_td_ta_map_id2thr = (p_td_ta_map_id2thr_t) env->GetLongField(this_obj, p_td_ta_map_id2thr_ID); td_thragent_t* p_td_thragent_t = (td_thragent_t*) env->GetLongField(this_obj, p_td_thragent_t_ID); if (p_td_thragent_t == 0) { return 0; } td_thrhandle_t thr_handle; te = p_td_ta_map_id2thr(p_td_thragent_t, (thread_t) tid, &thr_handle); if (te != TD_OK) { snprintf(errMsg, ERR_MSG_SIZE, "can't map thread id to thread handle! td_ta_map_id2thr failed: %d", te); THROW_NEW_DEBUGGER_EXCEPTION_(errMsg, 0); } p_td_thr_getgregs_t p_td_thr_getgregs = (p_td_thr_getgregs_t) env->GetLongField(this_obj, p_td_thr_getgregs_ID); prgregset_t gregs; p_td_thr_getgregs(&thr_handle, gregs); jlongArray res = env->NewLongArray(NPRGREG); CHECK_EXCEPTION_(0); jboolean isCopy; jlong* ptr = env->GetLongArrayElements(res, &isCopy); CHECK_EXCEPTION_(NULL); for (int i = 0; i < NPRGREG; i++) { ptr[i] = (jlong) (uintptr_t) gregs[i]; } env->ReleaseLongArrayElements(res, ptr, JNI_COMMIT); return res; } /* * Class: sun_jvm_hotspot_debugger_proc_ProcDebuggerLocal * Method: fillThreadList0 * Signature: (Ljava/util/List;)V * Description: fills thread list of the debuggee process/core */ JNIEXPORT void JNICALL Java_sun_jvm_hotspot_debugger_proc_ProcDebuggerLocal_fillThreadList0 (JNIEnv *env, jobject this_obj, jobject list) { td_thragent_t* p_td_thragent_t = (td_thragent_t*) env->GetLongField(this_obj, p_td_thragent_t_ID); if (p_td_thragent_t == 0) { return; } p_td_ta_thr_iter_t p_td_ta_thr_iter = (p_td_ta_thr_iter_t) env->GetLongField(this_obj, p_td_ta_thr_iter_ID); DebuggerWithObject dbgo; dbgo.env = env; dbgo.this_obj = this_obj; dbgo.obj = list; p_td_ta_thr_iter(p_td_thragent_t, fill_thread_list, &dbgo, TD_THR_ANY_STATE, TD_THR_LOWEST_PRIORITY, TD_SIGNO_MASK, TD_THR_ANY_USER_FLAGS); } /* * Class: sun_jvm_hotspot_debugger_proc_ProcDebuggerLocal * Method: fillCFrameList0 * Signature: ([J)Lsun/jvm/hotspot/debugger/proc/ProcCFrame; * Description: fills CFrame list for a given thread */ JNIEXPORT jobject JNICALL Java_sun_jvm_hotspot_debugger_proc_ProcDebuggerLocal_fillCFrameList0 (JNIEnv *env, jobject this_obj, jlongArray regsArray) { jlong p_ps_prochandle = env->GetLongField(this_obj, p_ps_prochandle_ID); DebuggerWith2Objects dbgo2; dbgo2.env = env; dbgo2.this_obj = this_obj; dbgo2.obj = NULL; dbgo2.obj2 = NULL; jboolean isCopy; jlong* ptr = env->GetLongArrayElements(regsArray, &isCopy); CHECK_EXCEPTION_(0); prgregset_t gregs; for (int i = 0; i < NPRGREG; i++) { gregs[i] = (uintptr_t) ptr[i]; } env->ReleaseLongArrayElements(regsArray, ptr, JNI_ABORT); CHECK_EXCEPTION_(0); Pstack_iter((struct ps_prochandle*) p_ps_prochandle, gregs, wrapper_fill_cframe_list, &dbgo2); return dbgo2.obj; } /* * Class: sun_jvm_hotspot_debugger_proc_ProcDebuggerLocal * Method: fillLoadObjectList0 * Signature: (Ljava/util/List;)V * Description: fills shared objects of the debuggee process/core */ JNIEXPORT void JNICALL Java_sun_jvm_hotspot_debugger_proc_ProcDebuggerLocal_fillLoadObjectList0 (JNIEnv *env, jobject this_obj, jobject list) { DebuggerWithObject dbgo; dbgo.env = env; dbgo.this_obj = this_obj; dbgo.obj = list; jlong p_ps_prochandle = env->GetLongField(this_obj, p_ps_prochandle_ID); Pobject_iter((struct ps_prochandle*) p_ps_prochandle, fill_load_object_list, &dbgo); } /* * Class: sun_jvm_hotspot_debugger_proc_ProcDebuggerLocal * Method: readBytesFromProcess0 * Signature: (JJ)[B * Description: read bytes from debuggee process/core */ JNIEXPORT jbyteArray JNICALL Java_sun_jvm_hotspot_debugger_proc_ProcDebuggerLocal_readBytesFromProcess0 (JNIEnv *env, jobject this_obj, jlong address, jlong numBytes) { jbyteArray array = env->NewByteArray(numBytes); CHECK_EXCEPTION_(0); jboolean isCopy; jbyte* bufPtr = env->GetByteArrayElements(array, &isCopy); CHECK_EXCEPTION_(0); jlong p_ps_prochandle = env->GetLongField(this_obj, p_ps_prochandle_ID); ps_err_e ret = ps_pread((struct ps_prochandle*) p_ps_prochandle, (psaddr_t)address, bufPtr, (size_t)numBytes); if (ret != PS_OK) { // part of the class sharing workaround. try shared heap area int classes_jsa_fd = env->GetIntField(this_obj, classes_jsa_fd_ID); if (classes_jsa_fd != -1 && address != (jlong)0) { print_debug("read failed at 0x%lx, attempting shared heap area\n", (long) address); CDSFileMapHeaderBase* pheader = (CDSFileMapHeaderBase*) env->GetLongField(this_obj, p_file_map_header_ID); // walk through the shared mappings -- we just have 9 of them. // so, linear walking is okay. for (int m = 0; m < NUM_CDS_REGIONS; m++) { // We can skip the non-read-only maps. These are mapped as MAP_PRIVATE // and hence will be read by libproc. Besides, the file copy may be // stale because the process might have modified those pages. if (pheader->_space[m]._read_only) { jlong baseAddress = (jlong) (uintptr_t) pheader->_space[m]._addr._base; size_t usedSize = pheader->_space[m]._used; if (address >= baseAddress && address < (baseAddress + usedSize)) { // the given address falls in this shared heap area print_debug("found shared map at 0x%lx\n", (long) baseAddress); // If more data is asked than actually mapped from file, we need to zero fill // till the end-of-page boundary. But, java array new does that for us. we just // need to read as much as data available. #define MIN2(x, y) (((x) < (y))? (x) : (y)) jlong diff = address - baseAddress; jlong bytesToRead = MIN2(numBytes, usedSize - diff); off_t offset = pheader->_space[m]._file_offset + off_t(diff); ssize_t bytesRead = pread(classes_jsa_fd, bufPtr, bytesToRead, offset); if (bytesRead != bytesToRead) { env->ReleaseByteArrayElements(array, bufPtr, JNI_ABORT); print_debug("shared map read failed\n"); return jbyteArray(0); } else { print_debug("shared map read succeeded\n"); env->ReleaseByteArrayElements(array, bufPtr, 0); return array; } } // is in current map } // is read only map } // for shared maps } // classes_jsa_fd != -1 env->ReleaseByteArrayElements(array, bufPtr, JNI_ABORT); return jbyteArray(0); } else { env->ReleaseByteArrayElements(array, bufPtr, 0); return array; } } /* * Class: sun_jvm_hotspot_debugger_proc_ProcDebuggerLocal * Method: writeBytesToProcess0 * Signature: (JJ[B)V * Description: write bytes into debugger process */ JNIEXPORT void JNICALL Java_sun_jvm_hotspot_debugger_proc_ProcDebuggerLocal_writeBytesToProcess0 (JNIEnv *env, jobject this_obj, jlong address, jlong numBytes, jbyteArray data) { char errMsg[ERR_MSG_SIZE]; ps_err_e pe; jlong p_ps_prochandle = env->GetLongField(this_obj, p_ps_prochandle_ID); jboolean isCopy; jbyte* ptr = env->GetByteArrayElements(data, &isCopy); CHECK_EXCEPTION; pe = ps_pwrite((struct ps_prochandle*) p_ps_prochandle, address, ptr, numBytes); if (pe != PS_OK) { snprintf(errMsg, ERR_MSG_SIZE, "Process write failed! ps_pwrite failed: %d", pe); env->ReleaseByteArrayElements(data, ptr, JNI_ABORT); THROW_NEW_DEBUGGER_EXCEPTION(errMsg); } env->ReleaseByteArrayElements(data, ptr, JNI_ABORT); } /* * Class: sun_jvm_hotspot_debugger_proc_ProcDebuggerLocal * Method: suspend0 * Signature: ()V */ JNIEXPORT void JNICALL Java_sun_jvm_hotspot_debugger_proc_ProcDebuggerLocal_suspend0 (JNIEnv *env, jobject this_obj) { jlong p_ps_prochandle = env->GetLongField(this_obj, p_ps_prochandle_ID); // for now don't check return value. revisit this again. Pstop((struct ps_prochandle*) p_ps_prochandle, 1000); } /* * Class: sun_jvm_hotspot_debugger_proc_ProcDebuggerLocal * Method: resume0 * Signature: ()V */ JNIEXPORT void JNICALL Java_sun_jvm_hotspot_debugger_proc_ProcDebuggerLocal_resume0 (JNIEnv *env, jobject this_obj) { jlong p_ps_prochandle = env->GetLongField(this_obj, p_ps_prochandle_ID); // for now don't check return value. revisit this again. Psetrun((struct ps_prochandle*) p_ps_prochandle, 0, PRCFAULT|PRSTOP); } /* * Class: sun_jvm_hotspot_debugger_proc_ProcDebuggerLocal * Method: lookupByName0 * Signature: (Ljava/lang/String;Ljava/lang/String;)J * Description: symbol lookup by name */ JNIEXPORT jlong JNICALL Java_sun_jvm_hotspot_debugger_proc_ProcDebuggerLocal_lookupByName0 (JNIEnv *env, jobject this_obj, jstring objectName, jstring symbolName) { jlong p_ps_prochandle; p_ps_prochandle = env->GetLongField(this_obj, p_ps_prochandle_ID); jboolean isCopy; const char* objectName_cstr = NULL; if (objectName != NULL) { objectName_cstr = env->GetStringUTFChars(objectName, &isCopy); CHECK_EXCEPTION_(0); } else { objectName_cstr = PR_OBJ_EVERY; } const char* symbolName_cstr = env->GetStringUTFChars(symbolName, &isCopy); CHECK_EXCEPTION_(0); psaddr_t symbol_addr = (psaddr_t) 0; ps_pglobal_lookup((struct ps_prochandle*) p_ps_prochandle, objectName_cstr, symbolName_cstr, &symbol_addr); if (symbol_addr == 0) { print_debug("lookup for %s in %s failed\n", symbolName_cstr, objectName_cstr); } if (objectName_cstr != PR_OBJ_EVERY) { env->ReleaseStringUTFChars(objectName, objectName_cstr); } env->ReleaseStringUTFChars(symbolName, symbolName_cstr); return (jlong) (uintptr_t) symbol_addr; } /* * Class: sun_jvm_hotspot_debugger_proc_ProcDebuggerLocal * Method: lookupByAddress0 * Signature: (J)Lsun/jvm/hotspot/debugger/cdbg/ClosestSymbol; * Description: lookup symbol name for a given address */ JNIEXPORT jobject JNICALL Java_sun_jvm_hotspot_debugger_proc_ProcDebuggerLocal_lookupByAddress0 (JNIEnv *env, jobject this_obj, jlong address) { jlong p_ps_prochandle; p_ps_prochandle = env->GetLongField(this_obj, p_ps_prochandle_ID); char nameBuf[SYMBOL_BUF_SIZE + 1]; GElf_Sym sym; int res = Plookup_by_addr((struct ps_prochandle*) p_ps_prochandle, (uintptr_t) address, nameBuf, sizeof(nameBuf), &sym, NULL); if (res != 0) { // failed return 0; } jstring resSym = env->NewStringUTF(nameBuf); CHECK_EXCEPTION_(0); return env->CallObjectMethod(this_obj, createClosestSymbol_ID, resSym, (address - sym.st_value)); } /* * Class: sun_jvm_hotspot_debugger_proc_ProcDebuggerLocal * Method: demangle0 * Signature: (Ljava/lang/String;)Ljava/lang/String; */ JNIEXPORT jstring JNICALL Java_sun_jvm_hotspot_debugger_proc_ProcDebuggerLocal_demangle0 (JNIEnv *env, jobject this_object, jstring name) { jboolean isCopy; const char* ptr = env->GetStringUTFChars(name, &isCopy); CHECK_EXCEPTION_(NULL); char buf[2*SYMBOL_BUF_SIZE + 1]; jstring res = 0; if (cplus_demangle((char*) ptr, buf, sizeof(buf)) != DEMANGLE_ESPACE) { res = env->NewStringUTF(buf); } else { res = name; } env->ReleaseStringUTFChars(name, ptr); return res; } /* * Class: sun_jvm_hotspot_debugger_proc_ProcDebuggerLocal * Method: initIDs * Signature: ()V * Description: get JNI ids for fields and methods of ProcDebuggerLocal class */ JNIEXPORT void JNICALL Java_sun_jvm_hotspot_debugger_proc_ProcDebuggerLocal_initIDs (JNIEnv *env, jclass clazz) { _libsaproc_debug = getenv("LIBSAPROC_DEBUG") != NULL; if (_libsaproc_debug) { // propagate debug mode to libproc.so static const char* var = "LIBPROC_DEBUG=1"; putenv((char*)var); } void* libproc_handle = dlopen("libproc.so", RTLD_LAZY | RTLD_GLOBAL); if (libproc_handle == 0) THROW_NEW_DEBUGGER_EXCEPTION("can't load libproc.so, if you are using Solaris 5.7 or below, copy libproc.so from 5.8!"); p_ps_prochandle_ID = env->GetFieldID(clazz, "p_ps_prochandle", "J"); CHECK_EXCEPTION; libthread_db_handle_ID = env->GetFieldID(clazz, "libthread_db_handle", "J"); CHECK_EXCEPTION; p_td_thragent_t_ID = env->GetFieldID(clazz, "p_td_thragent_t", "J"); CHECK_EXCEPTION; p_td_init_ID = env->GetFieldID(clazz, "p_td_init", "J"); CHECK_EXCEPTION; p_td_ta_new_ID = env->GetFieldID(clazz, "p_td_ta_new", "J"); CHECK_EXCEPTION; p_td_ta_delete_ID = env->GetFieldID(clazz, "p_td_ta_delete", "J"); CHECK_EXCEPTION; p_td_ta_thr_iter_ID = env->GetFieldID(clazz, "p_td_ta_thr_iter", "J"); CHECK_EXCEPTION; p_td_thr_get_info_ID = env->GetFieldID(clazz, "p_td_thr_get_info", "J"); CHECK_EXCEPTION; p_td_ta_map_id2thr_ID = env->GetFieldID(clazz, "p_td_ta_map_id2thr", "J"); CHECK_EXCEPTION; p_td_thr_getgregs_ID = env->GetFieldID(clazz, "p_td_thr_getgregs", "J"); CHECK_EXCEPTION; getThreadForThreadId_ID = env->GetMethodID(clazz, "getThreadForThreadId", "(J)Lsun/jvm/hotspot/debugger/ThreadProxy;"); CHECK_EXCEPTION; pcRegIndex_ID = env->GetFieldID(clazz, "pcRegIndex", "I"); CHECK_EXCEPTION; fpRegIndex_ID = env->GetFieldID(clazz, "fpRegIndex", "I"); CHECK_EXCEPTION; createSenderFrame_ID = env->GetMethodID(clazz, "createSenderFrame", "(Lsun/jvm/hotspot/debugger/proc/ProcCFrame;JJ)Lsun/jvm/hotspot/debugger/proc/ProcCFrame;"); CHECK_EXCEPTION; createLoadObject_ID = env->GetMethodID(clazz, "createLoadObject", "(Ljava/lang/String;JJ)Lsun/jvm/hotspot/debugger/cdbg/LoadObject;"); CHECK_EXCEPTION; createClosestSymbol_ID = env->GetMethodID(clazz, "createClosestSymbol", "(Ljava/lang/String;J)Lsun/jvm/hotspot/debugger/cdbg/ClosestSymbol;"); CHECK_EXCEPTION; jclass list_clazz = env->FindClass("java/util/List"); CHECK_EXCEPTION; listAdd_ID = env->GetMethodID(list_clazz, "add", "(Ljava/lang/Object;)Z"); CHECK_EXCEPTION; // part of the class sharing workaround classes_jsa_fd_ID = env->GetFieldID(clazz, "classes_jsa_fd", "I"); CHECK_EXCEPTION; p_file_map_header_ID = env->GetFieldID(clazz, "p_file_map_header", "J"); CHECK_EXCEPTION; }