/*

 * Copyright (c) 2003, 2018, 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 <stdio.h>

#include <string.h>

#include "jvmti.h"

#include "agent_common.h"

#include "JVMTITools.h"

extern "C" {

#define PASSED 0

#define STATUS_FAILED 2

typedef struct {

    const char *name;

    const char *sig;

    jint value;

} var_info;

typedef struct {

    jboolean isObsolete;

    const char *name;

    const char *sig;

    jint line;

    jint count;

    var_info *vars;

} frame_info;

static jvmtiEnv *jvmti = NULL;

static jvmtiCapabilities caps;

static jvmtiEventCallbacks callbacks;

static jint result = PASSED;

static jboolean printdump = JNI_FALSE;

static jbyteArray classBytes;

static jmethodID midCheckPoint = NULL;

static jmethodID midRun = NULL;

static jint framesExpected = 0;

static jint framesCount = 0;

static const char *cls_exp = "Lnsk/jvmti/RedefineClasses/redefclass019a;";

static var_info run[] = {

    {"this", "Lnsk/jvmti/RedefineClasses/redefclass019a;", 0}

};

static var_info checkPoint[] = {

    {"this", "Lnsk/jvmti/RedefineClasses/redefclass019a;", 0}

};

static var_info chain1[] = {

    {"this", "Lnsk/jvmti/RedefineClasses/redefclass019a;", 0},

    {"localInt1", "I", 2},

    {"localInt2", "I", 3333}

};

static var_info chain2[] = {

    {"this", "Lnsk/jvmti/RedefineClasses/redefclass019a;", 0}

};

static var_info chain3[] = {

    {"this", "Lnsk/jvmti/RedefineClasses/redefclass019a;", 0}

};

static frame_info frames[] = {

    {JNI_TRUE,  "checkPoint", "()V", 115, 1, checkPoint},

    {JNI_FALSE, "chain3",     "()V", 49, 1, chain3},

    {JNI_FALSE, "chain2",     "()V", 44, 1, chain2},

    {JNI_FALSE, "chain1",     "()V", 39, 3, chain1},

    {JNI_FALSE, "run",        "()V", 32, 1, run},

};

void check(jvmtiEnv *jvmti_env, jthread thr, jmethodID mid, jint i) {

    jvmtiError err;

    jclass cls;

    jlocation loc;

    char *sigClass, *name = NULL, *sig = NULL, *generic;

    jboolean is_obsolete;

    jvmtiLineNumberEntry *lines = NULL;

    jvmtiLocalVariableEntry *table = NULL;

    jint line = -1;

    jint entryCount = 0;

    jint varValue = -1;

    jint j, k;

    if (i >= (jint) (sizeof(frames)/sizeof(frame_info))) {

        printf("(pop %d) too many frames\n", i);

        result = STATUS_FAILED;

        return;

    }

    err = jvmti_env->GetFrameLocation(thr, 0, &mid, &loc);

    if (err != JVMTI_ERROR_NONE) {

        printf("(GetClassSignature#%d) unexpected error: %s (%d)\n",

               i, TranslateError(err), err);

        result = STATUS_FAILED;

    }

    err = jvmti_env->GetMethodDeclaringClass(mid, &cls);

    if (err != JVMTI_ERROR_NONE) {

        printf("(GetMethodDeclaringClass#%d) unexpected error: %s (%d)\n",

               i, TranslateError(err), err);

        result = STATUS_FAILED;

    }

    err = jvmti_env->GetClassSignature(cls, &sigClass, &generic);

    if (err != JVMTI_ERROR_NONE) {

        printf("(GetClassSignature#%d) unexpected error: %s (%d)\n",

               i, TranslateError(err), err);

        result = STATUS_FAILED;

    }

    if (sigClass == NULL || strcmp(sigClass, cls_exp) != 0) {

        printf("(pop %d) wrong class sig: \"%s\",", i, sigClass);

        printf(" expected: \"%s\"\n", cls_exp);

        if (sigClass != NULL) {

            jvmti_env->Deallocate((unsigned char*)sigClass);

        }

        result = STATUS_FAILED;

    } else {

        err = jvmti_env->GetMethodName(mid, &name, &sig, &generic);

        if (err != JVMTI_ERROR_NONE) {

            printf("(GetMethodName#%d) unexpected error: %s (%d)\n",

                   i, TranslateError(err), err);

            result = STATUS_FAILED;

        }

        err = jvmti_env->IsMethodObsolete(mid, &is_obsolete);

        if (err != JVMTI_ERROR_NONE) {

            printf("(IsMethodObsolete#%d) unexpected error: %s (%d)\n",

                   i, TranslateError(err), err);

            result = STATUS_FAILED;

        }

        if (printdump == JNI_TRUE) {

            printf(">>> pop %d: \"%s.%s%s\"%s\n", i, sigClass, name, sig,

                (is_obsolete == JNI_TRUE) ? " (obsolete)" : "");

        }

        if (frames[i].isObsolete != is_obsolete) {

            printf("(pop %d) %s obsolete method\n", i,

                (is_obsolete == JNI_TRUE) ? "unexpected" : "should be");

            result = STATUS_FAILED;

        }

        if (name == NULL || strcmp(name, frames[i].name) != 0) {

            printf("(pop %d) wrong method name: \"%s\",", i, name);

            printf(" expected: \"%s\"\n", frames[i].name);

            result = STATUS_FAILED;

        }

        if (sig == NULL || strcmp(sig, frames[i].sig) != 0) {

            printf("(pop %d) wrong method sig: \"%s\",", i, sig);

            printf(" expected: \"%s\"\n", frames[i].sig);

            result = STATUS_FAILED;

        }

        err = jvmti_env->GetLineNumberTable(mid,

            &entryCount, &lines);

        if (err != JVMTI_ERROR_NONE) {

            printf("(GetClassSignature#%d) unexpected error: %s (%d)\n",

                   i, TranslateError(err), err);

            result = STATUS_FAILED;

        }

        if (lines != NULL && entryCount > 0) {

            for (k = 0; k < entryCount; k++) {

                if (loc < lines[k].start_location) {

                    break;

                }

            }

            line = lines[k-1].line_number;

        }

        if (line != frames[i].line) {

            printf("(pop %d) wrong line number: %d, expected: %d\n",

                   i, line, frames[i].line);

            result = STATUS_FAILED;

        }

        err = jvmti_env->GetLocalVariableTable(mid,

            &entryCount, &table);

        if (err != JVMTI_ERROR_NONE) {

            printf("(GetLocalVariableTable#%d) unexpected error: %s (%d)\n",

                   i, TranslateError(err), err);

            result = STATUS_FAILED;

        }

        if (frames[i].count != entryCount) {

            printf("(pop %d) wrong number of locals: %d, expected: %d\n",

                   i, entryCount, frames[i].count);

            result = STATUS_FAILED;

        }

        if (table != NULL) {

            for (k = 0; k < frames[i].count; k++) {

                for (j = 0; j < entryCount; j++) {

                    if (strcmp(table[j].name, frames[i].vars[k].name) == 0 &&

                        strcmp(table[j].signature, frames[i].vars[k].sig) == 0) {

                        if (table[j].signature[0] == 'I') {

                            err = jvmti_env->GetLocalInt(thr, 0,

                                table[j].slot, &varValue);

                            if (err != JVMTI_ERROR_NONE) {

                                printf("(GetLocalInt#%d) unexpected error: %s (%d)\n",

                                       i, TranslateError(err), err);

                                result = STATUS_FAILED;

                            }

                            if (printdump == JNI_TRUE) {

                                printf(">>>   var: \"%s %s\"",

                                       table[j].name, table[j].signature);

                                printf(", value: %d\n", varValue);

                            }

                            if (varValue != frames[i].vars[k].value) {

                                printf("(pop %d) wrong local var value: %d,",

                                       i, varValue);

                                printf(" expected: %d\n", frames[i].vars[k].value);

                                result = STATUS_FAILED;

                            }

                        } else if (printdump == JNI_TRUE) {

                            printf(">>>   var: \"%s %s\"\n",

                                   table[j].name, table[j].signature);

                        }

                        break;

                    }

                }

                if (j == entryCount) {

                    printf("(pop %d) var \"%s %s\" not found\n",

                           i, frames[i].vars[k].name, frames[i].vars[k].sig);

                    result = STATUS_FAILED;

                }

            }

        }

    }

    if (sigClass != NULL) {

        jvmti_env->Deallocate((unsigned char*)sigClass);

    }

    if (name != NULL) {

        jvmti_env->Deallocate((unsigned char*)name);

    }

    if (sig != NULL) {

        jvmti_env->Deallocate((unsigned char*)sig);

    }

    if (lines != NULL) {

        jvmti_env->Deallocate((unsigned char*)lines);

    }

    if (table != NULL) {

        for (j = 0; j < entryCount; j++) {

            jvmti_env->Deallocate((unsigned char*)(table[j].name));

            jvmti_env->Deallocate((unsigned char*)(table[j].signature));

        }

        jvmti_env->Deallocate((unsigned char*)table);

    }

}

void JNICALL Breakpoint(jvmtiEnv *jvmti_env, JNIEnv *env,

        jthread thread, jmethodID method, jlocation location) {

    jvmtiError err;

    jclass klass;

    jvmtiClassDefinition classDef;

    if (midCheckPoint != method) {

        printf("bp: don't know where we get called from\n");

        result = STATUS_FAILED;

        return;

    }

    if (printdump == JNI_TRUE) {

        printf(">>> breakpoint in checkPoint\n");

    }

    err = jvmti_env->ClearBreakpoint(midCheckPoint, 0);

    if (err != JVMTI_ERROR_NONE) {

        printf("(ClearBreakpoint) unexpected error: %s (%d)\n",

               TranslateError(err), err);

        result = STATUS_FAILED;

    }

    err = jvmti_env->GetMethodDeclaringClass(method, &klass);

    if (err != JVMTI_ERROR_NONE) {

        printf("(GetMethodDeclaringClass) unexpected error: %s (%d)\n",

               TranslateError(err), err);

        result = STATUS_FAILED;

        return;

    }

    classDef.klass = klass;

    classDef.class_bytes = (unsigned char *)

    if (printdump == JNI_TRUE) {

        printf(">>> about to call RedefineClasses\n");

    }

    err = jvmti_env->RedefineClasses(1, &classDef);

    if (err != JVMTI_ERROR_NONE) {

        printf("(RedefineClasses) unexpected error: %s (%d)\n",

               TranslateError(err), err);

        result = STATUS_FAILED;

    }

    err = jvmti_env->NotifyFramePop(thread, 0);

    if (err != JVMTI_ERROR_NONE) {

        printf("(NotifyFramePop) unexpected error: %s (%d)\n",

               TranslateError(err), err);

        result = STATUS_FAILED;

    }

}

void JNICALL FramePop(jvmtiEnv *jvmti_env, JNIEnv *env, jthread thread,

        jmethodID method, jboolean wasPopedByException) {

    jvmtiError err;

    check(jvmti_env, thread, method, framesCount);

    framesCount++;

    if (method != midRun) {

        err = jvmti_env->NotifyFramePop(thread, 1);

        if (err != JVMTI_ERROR_NONE) {

            printf("(NotifyFramePop#%d) unexpected error: %s (%d)\n",

                   framesCount, TranslateError(err), err);

            result = STATUS_FAILED;

        }

    } else {

        if (printdump == JNI_TRUE) {

            printf(">>> poped %d frames till method \"run()\"\n",

                   framesCount);

        }

    }

}

#ifdef STATIC_BUILD

JNIEXPORT jint JNICALL Agent_OnLoad_redefclass019(JavaVM *jvm, char *options, void *reserved) {

    return Agent_Initialize(jvm, options, reserved);

}

JNIEXPORT jint JNICALL Agent_OnAttach_redefclass019(JavaVM *jvm, char *options, void *reserved) {

    return Agent_Initialize(jvm, options, reserved);

}

JNIEXPORT jint JNI_OnLoad_redefclass019(JavaVM *jvm, char *options, void *reserved) {

    return JNI_VERSION_1_8;

}

#endif

jint Agent_Initialize(JavaVM *jvm, char *options, void *reserved) {

    jvmtiError err;

    jint res;

    if (options != NULL && strcmp(options, "printdump") == 0) {

        printdump = JNI_TRUE;

    }

    if (res != JNI_OK || jvmti == NULL) {

        printf("Wrong result of a valid call to GetEnv!\n");

        return JNI_ERR;

    }

    err = jvmti->GetPotentialCapabilities(&caps);

    if (err != JVMTI_ERROR_NONE) {

        printf("(GetPotentialCapabilities) unexpected error: %s (%d)\n",

               TranslateError(err), err);

        return JNI_ERR;

    }

    err = jvmti->AddCapabilities(&caps);

    if (err != JVMTI_ERROR_NONE) {

        printf("(AddCapabilities) unexpected error: %s (%d)\n",

               TranslateError(err), err);

        return JNI_ERR;

    }

    err = jvmti->GetCapabilities(&caps);

    if (err != JVMTI_ERROR_NONE) {

        printf("(GetCapabilities) unexpected error: %s (%d)\n",

               TranslateError(err), err);

        return JNI_ERR;

    }

    if (!caps.can_redefine_classes) {

        printf("Warning: RedefineClasses is not implemented\n");

    }

    if (!caps.can_get_line_numbers) {

        printf("Warning: GetLineNumberTable is not implemented\n");

    }

    if (!caps.can_access_local_variables) {

        printf("Warning: access to local variables is not implemented\n");

    }

    if (caps.can_generate_breakpoint_events &&

            caps.can_generate_frame_pop_events) {

        callbacks.Breakpoint = &Breakpoint;

        callbacks.FramePop = &FramePop;

        err = jvmti->SetEventCallbacks(&callbacks, sizeof(callbacks));

        if (err != JVMTI_ERROR_NONE) {

            printf("(SetEventCallbacks) unexpected error: %s (%d)\n",

                   TranslateError(err), err);

            return JNI_ERR;

        }

    } else {

        printf("Warning: Breakpoint event is not implemented\n");

    }

    return JNI_OK;

}

JNIEXPORT void JNICALL

Java_nsk_jvmti_RedefineClasses_redefclass019_getReady(JNIEnv *env, jclass cls,

        jclass clazz, jbyteArray bytes, jint depth) {

    jvmtiError err;

    if (jvmti == NULL) {

        printf("JVMTI client was not properly loaded!\n");

        result = STATUS_FAILED;

        return;

    }

    if (!caps.can_redefine_classes ||

        !caps.can_generate_breakpoint_events ||

        !caps.can_generate_frame_pop_events ||

        !caps.can_get_line_numbers ||

        !caps.can_access_local_variables) return;

    if (midRun == NULL) {

        printf("Cannot find Method ID for method run\n");

        result = STATUS_FAILED;

        return;

    }

    if (midCheckPoint == NULL) {

        printf("Cannot find Method ID for method checkPoint\n");

        result = STATUS_FAILED;

        return;

    }

    err = jvmti->SetBreakpoint(midCheckPoint, 0);

    if (err != JVMTI_ERROR_NONE) {

        printf("(SetBreakpoint) unexpected error: %s (%d)\n",

               TranslateError(err), err);

        result = STATUS_FAILED;

        return;

    }

    err = jvmti->SetEventNotificationMode(JVMTI_ENABLE,

        JVMTI_EVENT_BREAKPOINT, NULL);

    if (err != JVMTI_ERROR_NONE) {

        printf("Failed to enable BREAKPOINT event: %s (%d)\n",

               TranslateError(err), err);

        result = STATUS_FAILED;

        return;

    }

    err = jvmti->SetEventNotificationMode(JVMTI_ENABLE,

        JVMTI_EVENT_FRAME_POP, NULL);

    if (err != JVMTI_ERROR_NONE) {

        printf("Failed to enable FRAME_POP event: %s (%d)\n",

               TranslateError(err), err);

        result = STATUS_FAILED;

    } else {

        framesExpected = depth;

    }

}

JNIEXPORT jint JNICALL

Java_nsk_jvmti_RedefineClasses_redefclass019_check(JNIEnv *env, jclass cls) {

    if (framesCount != framesExpected) {

        printf("Wrong number of frames: %d, expected: %d\n",

            framesCount, framesExpected);

        result = STATUS_FAILED;

    }

    return result;

}

}