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Java example source code file (BsdDebuggerLocal.c)

This example Java source code file (BsdDebuggerLocal.c) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

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can\'t, check_exception, check_exception_, java_sun_jvm_hotspot_debugger_bsd_bsddebuggerlocal_attach0__ljava_lang_string_2ljava_lang_string_2, java_sun_jvm_hotspot_debugger_bsd_bsddebuggerlocal_getthreadintegerregisterset0, jnicall, jnienv, jniexport, ljava\/util\/list, nprgreg, null, reg_index, throw_new_debugger_exception, throw_new_debugger_exception_

The BsdDebuggerLocal.c Java example source code

/*
 * Copyright (c) 2002, 2007, 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 <stdlib.h>
#include <jni.h>
#include "libproc.h"

#if defined(x86_64) && !defined(amd64)
#define amd64 1
#endif

#ifdef i386
#include "sun_jvm_hotspot_debugger_x86_X86ThreadContext.h"
#endif

#ifdef amd64
#include "sun_jvm_hotspot_debugger_amd64_AMD64ThreadContext.h"
#endif

#if defined(sparc) || defined(sparcv9)
#include "sun_jvm_hotspot_debugger_sparc_SPARCThreadContext.h"
#endif

static jfieldID p_ps_prochandle_ID = 0;
static jfieldID threadList_ID = 0;
static jfieldID loadObjectList_ID = 0;

static jmethodID createClosestSymbol_ID = 0;
static jmethodID createLoadObject_ID = 0;
static jmethodID getThreadForThreadId_ID = 0;
static jmethodID listAdd_ID = 0;

#define CHECK_EXCEPTION_(value) if ((*env)->ExceptionOccurred(env)) { return value; }
#define CHECK_EXCEPTION if ((*env)->ExceptionOccurred(env)) { return;}
#define THROW_NEW_DEBUGGER_EXCEPTION_(str, value) { throw_new_debugger_exception(env, str); return value; }
#define THROW_NEW_DEBUGGER_EXCEPTION(str) { throw_new_debugger_exception(env, str); return;}

static void throw_new_debugger_exception(JNIEnv* env, const char* errMsg) {
  (*env)->ThrowNew(env, (*env)->FindClass(env, "sun/jvm/hotspot/debugger/DebuggerException"), errMsg);
}

static struct ps_prochandle* get_proc_handle(JNIEnv* env, jobject this_obj) {
  jlong ptr = (*env)->GetLongField(env, this_obj, p_ps_prochandle_ID);
  return (struct ps_prochandle*)(intptr_t)ptr;
}

/*
 * Class:     sun_jvm_hotspot_debugger_bsd_BsdDebuggerLocal
 * Method:    init0
 * Signature: ()V
 */
JNIEXPORT void JNICALL Java_sun_jvm_hotspot_debugger_bsd_BsdDebuggerLocal_init0
  (JNIEnv *env, jclass cls) {
  jclass listClass;

  if (init_libproc(getenv("LIBSAPROC_DEBUG") != NULL) != true) {
     THROW_NEW_DEBUGGER_EXCEPTION("can't initialize libproc");
  }

  // fields we use
  p_ps_prochandle_ID = (*env)->GetFieldID(env, cls, "p_ps_prochandle", "J");
  CHECK_EXCEPTION;
  threadList_ID = (*env)->GetFieldID(env, cls, "threadList", "Ljava/util/List;");
  CHECK_EXCEPTION;
  loadObjectList_ID = (*env)->GetFieldID(env, cls, "loadObjectList", "Ljava/util/List;");
  CHECK_EXCEPTION;

  // methods we use
  createClosestSymbol_ID = (*env)->GetMethodID(env, cls, "createClosestSymbol",
                    "(Ljava/lang/String;J)Lsun/jvm/hotspot/debugger/cdbg/ClosestSymbol;");
  CHECK_EXCEPTION;
  createLoadObject_ID = (*env)->GetMethodID(env, cls, "createLoadObject",
                    "(Ljava/lang/String;JJ)Lsun/jvm/hotspot/debugger/cdbg/LoadObject;");
  CHECK_EXCEPTION;
  getThreadForThreadId_ID = (*env)->GetMethodID(env, cls, "getThreadForThreadId",
                                                     "(J)Lsun/jvm/hotspot/debugger/ThreadProxy;");
  CHECK_EXCEPTION;
  // java.util.List method we call
  listClass = (*env)->FindClass(env, "java/util/List");
  CHECK_EXCEPTION;
  listAdd_ID = (*env)->GetMethodID(env, listClass, "add", "(Ljava/lang/Object;)Z");
  CHECK_EXCEPTION;
}

JNIEXPORT jint JNICALL Java_sun_jvm_hotspot_debugger_bsd_BsdDebuggerLocal_getAddressSize
  (JNIEnv *env, jclass cls)
{
#ifdef _LP64
 return 8;
#else
 return 4;
#endif

}


static void fillThreadsAndLoadObjects(JNIEnv* env, jobject this_obj, struct ps_prochandle* ph) {
  int n = 0, i = 0;

  // add threads
  n = get_num_threads(ph);
  for (i = 0; i < n; i++) {
    jobject thread;
    jobject threadList;
    lwpid_t lwpid;

    lwpid = get_lwp_id(ph, i);
    thread = (*env)->CallObjectMethod(env, this_obj, getThreadForThreadId_ID,
                                      (jlong)lwpid);
    CHECK_EXCEPTION;
    threadList = (*env)->GetObjectField(env, this_obj, threadList_ID);
    CHECK_EXCEPTION;
    (*env)->CallBooleanMethod(env, threadList, listAdd_ID, thread);
    CHECK_EXCEPTION;
  }

  // add load objects
  n = get_num_libs(ph);
  for (i = 0; i < n; i++) {
     uintptr_t base;
     const char* name;
     jobject loadObject;
     jobject loadObjectList;

     base = get_lib_base(ph, i);
     name = get_lib_name(ph, i);
     loadObject = (*env)->CallObjectMethod(env, this_obj, createLoadObject_ID,
                                   (*env)->NewStringUTF(env, name), (jlong)0, (jlong)base);
     CHECK_EXCEPTION;
     loadObjectList = (*env)->GetObjectField(env, this_obj, loadObjectList_ID);
     CHECK_EXCEPTION;
     (*env)->CallBooleanMethod(env, loadObjectList, listAdd_ID, loadObject);
     CHECK_EXCEPTION;
  }
}

/*
 * Class:     sun_jvm_hotspot_debugger_bsd_BsdDebuggerLocal
 * Method:    attach0
 * Signature: (I)V
 */
JNIEXPORT void JNICALL Java_sun_jvm_hotspot_debugger_bsd_BsdDebuggerLocal_attach0__I
  (JNIEnv *env, jobject this_obj, jint jpid) {

  struct ps_prochandle* ph;
  if ( (ph = Pgrab(jpid)) == NULL) {
    THROW_NEW_DEBUGGER_EXCEPTION("Can't attach to the process");
  }
  (*env)->SetLongField(env, this_obj, p_ps_prochandle_ID, (jlong)(intptr_t)ph);
  fillThreadsAndLoadObjects(env, this_obj, ph);
}

/*
 * Class:     sun_jvm_hotspot_debugger_bsd_BsdDebuggerLocal
 * Method:    attach0
 * Signature: (Ljava/lang/String;Ljava/lang/String;)V
 */
JNIEXPORT void JNICALL Java_sun_jvm_hotspot_debugger_bsd_BsdDebuggerLocal_attach0__Ljava_lang_String_2Ljava_lang_String_2
  (JNIEnv *env, jobject this_obj, jstring execName, jstring coreName) {
  const char *execName_cstr;
  const char *coreName_cstr;
  jboolean isCopy;
  struct ps_prochandle* ph;

  execName_cstr = (*env)->GetStringUTFChars(env, execName, &isCopy);
  CHECK_EXCEPTION;
  coreName_cstr = (*env)->GetStringUTFChars(env, coreName, &isCopy);
  CHECK_EXCEPTION;

  if ( (ph = Pgrab_core(execName_cstr, coreName_cstr)) == NULL) {
    (*env)->ReleaseStringUTFChars(env, execName, execName_cstr);
    (*env)->ReleaseStringUTFChars(env, coreName, coreName_cstr);
    THROW_NEW_DEBUGGER_EXCEPTION("Can't attach to the core file");
  }
  (*env)->SetLongField(env, this_obj, p_ps_prochandle_ID, (jlong)(intptr_t)ph);
  (*env)->ReleaseStringUTFChars(env, execName, execName_cstr);
  (*env)->ReleaseStringUTFChars(env, coreName, coreName_cstr);
  fillThreadsAndLoadObjects(env, this_obj, ph);
}

/*
 * Class:     sun_jvm_hotspot_debugger_bsd_BsdDebuggerLocal
 * Method:    detach0
 * Signature: ()V
 */
JNIEXPORT void JNICALL Java_sun_jvm_hotspot_debugger_bsd_BsdDebuggerLocal_detach0
  (JNIEnv *env, jobject this_obj) {
  struct ps_prochandle* ph = get_proc_handle(env, this_obj);
  if (ph != NULL) {
     Prelease(ph);
  }
}

/*
 * Class:     sun_jvm_hotspot_debugger_bsd_BsdDebuggerLocal
 * Method:    lookupByName0
 * Signature: (Ljava/lang/String;Ljava/lang/String;)J
 */
JNIEXPORT jlong JNICALL Java_sun_jvm_hotspot_debugger_bsd_BsdDebuggerLocal_lookupByName0
  (JNIEnv *env, jobject this_obj, jstring objectName, jstring symbolName) {
  const char *objectName_cstr, *symbolName_cstr;
  jlong addr;
  jboolean isCopy;
  struct ps_prochandle* ph = get_proc_handle(env, this_obj);

  objectName_cstr = NULL;
  if (objectName != NULL) {
    objectName_cstr = (*env)->GetStringUTFChars(env, objectName, &isCopy);
    CHECK_EXCEPTION_(0);
  }
  symbolName_cstr = (*env)->GetStringUTFChars(env, symbolName, &isCopy);
  CHECK_EXCEPTION_(0);

  addr = (jlong) lookup_symbol(ph, objectName_cstr, symbolName_cstr);

  if (objectName_cstr != NULL) {
    (*env)->ReleaseStringUTFChars(env, objectName, objectName_cstr);
  }
  (*env)->ReleaseStringUTFChars(env, symbolName, symbolName_cstr);
  return addr;
}

/*
 * Class:     sun_jvm_hotspot_debugger_bsd_BsdDebuggerLocal
 * Method:    lookupByAddress0
 * Signature: (J)Lsun/jvm/hotspot/debugger/cdbg/ClosestSymbol;
 */
JNIEXPORT jobject JNICALL Java_sun_jvm_hotspot_debugger_bsd_BsdDebuggerLocal_lookupByAddress0
  (JNIEnv *env, jobject this_obj, jlong addr) {
  uintptr_t offset;
  const char* sym = NULL;

  struct ps_prochandle* ph = get_proc_handle(env, this_obj);
  sym = symbol_for_pc(ph, (uintptr_t) addr, &offset);
  if (sym == NULL) return 0;
  return (*env)->CallObjectMethod(env, this_obj, createClosestSymbol_ID,
                          (*env)->NewStringUTF(env, sym), (jlong)offset);
}

/*
 * Class:     sun_jvm_hotspot_debugger_bsd_BsdDebuggerLocal
 * Method:    readBytesFromProcess0
 * Signature: (JJ)Lsun/jvm/hotspot/debugger/ReadResult;
 */
JNIEXPORT jbyteArray JNICALL Java_sun_jvm_hotspot_debugger_bsd_BsdDebuggerLocal_readBytesFromProcess0
  (JNIEnv *env, jobject this_obj, jlong addr, jlong numBytes) {

  jboolean isCopy;
  jbyteArray array;
  jbyte *bufPtr;
  ps_err_e err;

  array = (*env)->NewByteArray(env, numBytes);
  CHECK_EXCEPTION_(0);
  bufPtr = (*env)->GetByteArrayElements(env, array, &isCopy);
  CHECK_EXCEPTION_(0);

  err = ps_pread(get_proc_handle(env, this_obj), (psaddr_t) (uintptr_t)addr, bufPtr, numBytes);
  (*env)->ReleaseByteArrayElements(env, array, bufPtr, 0);
  return (err == PS_OK)? array : 0;
}

JNIEXPORT jlongArray JNICALL Java_sun_jvm_hotspot_debugger_bsd_BsdDebuggerLocal_getThreadIntegerRegisterSet0
  (JNIEnv *env, jobject this_obj, jint lwp_id) {

  struct reg gregs;
  jboolean isCopy;
  jlongArray array;
  jlong *regs;

  struct ps_prochandle* ph = get_proc_handle(env, this_obj);
  if (get_lwp_regs(ph, lwp_id, &gregs) != true) {
     THROW_NEW_DEBUGGER_EXCEPTION_("get_thread_regs failed for a lwp", 0);
  }

#undef NPRGREG
#ifdef i386
#define NPRGREG sun_jvm_hotspot_debugger_x86_X86ThreadContext_NPRGREG
#endif
#ifdef ia64
#define NPRGREG IA64_REG_COUNT
#endif
#ifdef amd64
#define NPRGREG sun_jvm_hotspot_debugger_amd64_AMD64ThreadContext_NPRGREG
#endif
#if defined(sparc) || defined(sparcv9)
#define NPRGREG sun_jvm_hotspot_debugger_sparc_SPARCThreadContext_NPRGREG
#endif

  array = (*env)->NewLongArray(env, NPRGREG);
  CHECK_EXCEPTION_(0);
  regs = (*env)->GetLongArrayElements(env, array, &isCopy);

#undef REG_INDEX

#ifdef i386
#define REG_INDEX(reg) sun_jvm_hotspot_debugger_x86_X86ThreadContext_##reg

  regs[REG_INDEX(GS)]  = (uintptr_t) gregs.r_gs;
  regs[REG_INDEX(FS)]  = (uintptr_t) gregs.r_fs;
  regs[REG_INDEX(ES)]  = (uintptr_t) gregs.r_es;
  regs[REG_INDEX(DS)]  = (uintptr_t) gregs.r_ds;
  regs[REG_INDEX(EDI)] = (uintptr_t) gregs.r_edi;
  regs[REG_INDEX(ESI)] = (uintptr_t) gregs.r_esi;
  regs[REG_INDEX(FP)] = (uintptr_t) gregs.r_ebp;
  regs[REG_INDEX(SP)] = (uintptr_t) gregs.r_isp;
  regs[REG_INDEX(EBX)] = (uintptr_t) gregs.r_ebx;
  regs[REG_INDEX(EDX)] = (uintptr_t) gregs.r_edx;
  regs[REG_INDEX(ECX)] = (uintptr_t) gregs.r_ecx;
  regs[REG_INDEX(EAX)] = (uintptr_t) gregs.r_eax;
  regs[REG_INDEX(PC)] = (uintptr_t) gregs.r_eip;
  regs[REG_INDEX(CS)]  = (uintptr_t) gregs.r_cs;
  regs[REG_INDEX(SS)]  = (uintptr_t) gregs.r_ss;

#endif /* i386 */

#if ia64
  regs = (*env)->GetLongArrayElements(env, array, &isCopy);
  int i;
  for (i = 0; i < NPRGREG; i++ ) {
    regs[i] = 0xDEADDEAD;
  }
#endif /* ia64 */

#ifdef amd64
#define REG_INDEX(reg) sun_jvm_hotspot_debugger_amd64_AMD64ThreadContext_##reg

  regs[REG_INDEX(R15)] = gregs.r_r15;
  regs[REG_INDEX(R14)] = gregs.r_r14;
  regs[REG_INDEX(R13)] = gregs.r_r13;
  regs[REG_INDEX(R12)] = gregs.r_r12;
  regs[REG_INDEX(RBP)] = gregs.r_rbp;
  regs[REG_INDEX(RBX)] = gregs.r_rbx;
  regs[REG_INDEX(R11)] = gregs.r_r11;
  regs[REG_INDEX(R10)] = gregs.r_r10;
  regs[REG_INDEX(R9)] = gregs.r_r9;
  regs[REG_INDEX(R8)] = gregs.r_r8;
  regs[REG_INDEX(RAX)] = gregs.r_rax;
  regs[REG_INDEX(RCX)] = gregs.r_rcx;
  regs[REG_INDEX(RDX)] = gregs.r_rdx;
  regs[REG_INDEX(RSI)] = gregs.r_rsi;
  regs[REG_INDEX(RDI)] = gregs.r_rdi;
  regs[REG_INDEX(RIP)] = gregs.r_rip;
  regs[REG_INDEX(CS)] = gregs.r_cs;
  regs[REG_INDEX(RSP)] = gregs.r_rsp;
  regs[REG_INDEX(SS)] = gregs.r_ss;
//  regs[REG_INDEX(FSBASE)] = gregs.fs_base;
//  regs[REG_INDEX(GSBASE)] = gregs.gs_base;
//  regs[REG_INDEX(DS)] = gregs.ds;
//  regs[REG_INDEX(ES)] = gregs.es;
//  regs[REG_INDEX(FS)] = gregs.fs;
//  regs[REG_INDEX(GS)] = gregs.gs;

#endif /* amd64 */

#if defined(sparc) || defined(sparcv9)

#define REG_INDEX(reg) sun_jvm_hotspot_debugger_sparc_SPARCThreadContext_##reg

#ifdef _LP64
  regs[REG_INDEX(R_PSR)] = gregs.tstate;
  regs[REG_INDEX(R_PC)]  = gregs.tpc;
  regs[REG_INDEX(R_nPC)] = gregs.tnpc;
  regs[REG_INDEX(R_Y)]   = gregs.y;
#else
  regs[REG_INDEX(R_PSR)] = gregs.psr;
  regs[REG_INDEX(R_PC)]  = gregs.pc;
  regs[REG_INDEX(R_nPC)] = gregs.npc;
  regs[REG_INDEX(R_Y)]   = gregs.y;
#endif
  regs[REG_INDEX(R_G0)]  =            0 ;
  regs[REG_INDEX(R_G1)]  = gregs.u_regs[0];
  regs[REG_INDEX(R_G2)]  = gregs.u_regs[1];
  regs[REG_INDEX(R_G3)]  = gregs.u_regs[2];
  regs[REG_INDEX(R_G4)]  = gregs.u_regs[3];
  regs[REG_INDEX(R_G5)]  = gregs.u_regs[4];
  regs[REG_INDEX(R_G6)]  = gregs.u_regs[5];
  regs[REG_INDEX(R_G7)]  = gregs.u_regs[6];
  regs[REG_INDEX(R_O0)]  = gregs.u_regs[7];
  regs[REG_INDEX(R_O1)]  = gregs.u_regs[8];
  regs[REG_INDEX(R_O2)]  = gregs.u_regs[ 9];
  regs[REG_INDEX(R_O3)]  = gregs.u_regs[10];
  regs[REG_INDEX(R_O4)]  = gregs.u_regs[11];
  regs[REG_INDEX(R_O5)]  = gregs.u_regs[12];
  regs[REG_INDEX(R_O6)]  = gregs.u_regs[13];
  regs[REG_INDEX(R_O7)]  = gregs.u_regs[14];
#endif /* sparc */


  (*env)->ReleaseLongArrayElements(env, array, regs, JNI_COMMIT);
  return array;
}

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