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Java example source code file (StackFrameImpl.c)

This example Java source code file (StackFrameImpl.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.

Learn more about this Java project at its project page.

Java - Java tags/keywords

end_with_local_refs, frameid, framenumber, jdwp_error, jdwp_tag, jni_true, jnienv, jvmti_error_none, jvmti_func_ptr, mod_static, packetinputstream, packetoutputstream, stackframe_cmds, with_local_refs

The StackFrameImpl.c Java example source code

/*
 * Copyright (c) 1998, 2005, 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 "util.h"
#include "StackFrameImpl.h"
#include "inStream.h"
#include "outStream.h"
#include "threadControl.h"
#include "FrameID.h"

static jdwpError
validateThreadFrame(jthread thread, FrameID frame)
{
    jvmtiError error;
    jdwpError  serror;
    jint count;
    error = threadControl_suspendCount(thread, &count);
    if ( error == JVMTI_ERROR_NONE ) {
        if ( count > 0 ) {
            serror = validateFrameID(thread, frame);
        } else {
            serror = JDWP_ERROR(THREAD_NOT_SUSPENDED);
        }
    } else {
        serror =  map2jdwpError(error);
    }
    return serror;
}

static jdwpError
writeVariableValue(JNIEnv *env, PacketOutputStream *out, jthread thread,
                   FrameNumber fnum, jint slot, jbyte typeKey)
{
    jvmtiError error;
    jvalue value;

    if (isObjectTag(typeKey)) {

        WITH_LOCAL_REFS(env, 1) {

            error = JVMTI_FUNC_PTR(gdata->jvmti,GetLocalObject)
                        (gdata->jvmti, thread, fnum, slot, &value.l);

            if (error != JVMTI_ERROR_NONE) {
                outStream_setError(out, map2jdwpError(error));
            } else {
                (void)outStream_writeByte(out, specificTypeKey(env, value.l));
                (void)outStream_writeObjectRef(env, out, value.l);
            }

        } END_WITH_LOCAL_REFS(env);

    } else {
        /*
         * For primitive types, the type key is bounced back as is.
         */
        (void)outStream_writeByte(out, typeKey);
        switch (typeKey) {
            case JDWP_TAG(BYTE): {
                    jint intValue;
                    error = JVMTI_FUNC_PTR(gdata->jvmti,GetLocalInt)
                                (gdata->jvmti, thread, fnum, slot, &intValue);
                    (void)outStream_writeByte(out, (jbyte)intValue);
                    break;
                }

            case JDWP_TAG(CHAR): {
                    jint intValue;
                    error = JVMTI_FUNC_PTR(gdata->jvmti,GetLocalInt)
                                (gdata->jvmti, thread, fnum, slot, &intValue);
                    (void)outStream_writeChar(out, (jchar)intValue);
                    break;
                }

            case JDWP_TAG(FLOAT):
                error = JVMTI_FUNC_PTR(gdata->jvmti,GetLocalFloat)
                                (gdata->jvmti, thread, fnum, slot, &value.f);
                (void)outStream_writeFloat(out, value.f);
                break;

            case JDWP_TAG(DOUBLE):
                error = JVMTI_FUNC_PTR(gdata->jvmti,GetLocalDouble)
                                (gdata->jvmti, thread, fnum, slot, &value.d);
                (void)outStream_writeDouble(out, value.d);
                break;

            case JDWP_TAG(INT):
                error = JVMTI_FUNC_PTR(gdata->jvmti,GetLocalInt)
                                (gdata->jvmti, thread, fnum, slot, &value.i);
                (void)outStream_writeInt(out, value.i);
                break;

            case JDWP_TAG(LONG):
                error = JVMTI_FUNC_PTR(gdata->jvmti,GetLocalLong)
                                (gdata->jvmti, thread, fnum, slot, &value.j);
                (void)outStream_writeLong(out, value.j);
                break;

            case JDWP_TAG(SHORT): {
                jint intValue;
                error = JVMTI_FUNC_PTR(gdata->jvmti,GetLocalInt)
                                (gdata->jvmti, thread, fnum, slot, &intValue);
                (void)outStream_writeShort(out, (jshort)intValue);
                break;
            }

            case JDWP_TAG(BOOLEAN):{
                jint intValue;
                error = JVMTI_FUNC_PTR(gdata->jvmti,GetLocalInt)
                                (gdata->jvmti, thread, fnum, slot, &intValue);
                (void)outStream_writeBoolean(out, (jboolean)intValue);
                break;
            }

            default:
                return JDWP_ERROR(INVALID_TAG);
        }
    }

    return map2jdwpError(error);
}

static jdwpError
readVariableValue(JNIEnv *env, PacketInputStream *in, jthread thread,
                  FrameNumber fnum, jint slot, jbyte typeKey)
{
    jvmtiError error;
    jvalue value;

    if (isObjectTag(typeKey)) {

        value.l = inStream_readObjectRef(env, in);

        error = JVMTI_FUNC_PTR(gdata->jvmti,SetLocalObject)
                        (gdata->jvmti, thread, fnum, slot, value.l);

    } else {
        switch (typeKey) {
            case JDWP_TAG(BYTE):
                value.b = inStream_readByte(in);
                error = JVMTI_FUNC_PTR(gdata->jvmti,SetLocalInt)
                                (gdata->jvmti, thread, fnum, slot, value.b);
                break;

            case JDWP_TAG(CHAR):
                value.c = inStream_readChar(in);
                error = JVMTI_FUNC_PTR(gdata->jvmti,SetLocalInt)
                                (gdata->jvmti, thread, fnum, slot, value.c);
                break;

            case JDWP_TAG(FLOAT):
                value.f = inStream_readFloat(in);
                error = JVMTI_FUNC_PTR(gdata->jvmti,SetLocalFloat)
                                (gdata->jvmti, thread, fnum, slot, value.f);
                break;

            case JDWP_TAG(DOUBLE):
                value.d = inStream_readDouble(in);
                error = JVMTI_FUNC_PTR(gdata->jvmti,SetLocalDouble)
                                (gdata->jvmti, thread, fnum, slot, value.d);
                break;

            case JDWP_TAG(INT):
                value.i = inStream_readInt(in);
                error = JVMTI_FUNC_PTR(gdata->jvmti,SetLocalInt)
                                (gdata->jvmti, thread, fnum, slot, value.i);
                break;

            case JDWP_TAG(LONG):
                value.j = inStream_readLong(in);
                error = JVMTI_FUNC_PTR(gdata->jvmti,SetLocalLong)
                                (gdata->jvmti, thread, fnum, slot, value.j);
                break;

            case JDWP_TAG(SHORT):
                value.s = inStream_readShort(in);
                error = JVMTI_FUNC_PTR(gdata->jvmti,SetLocalInt)
                                (gdata->jvmti, thread, fnum, slot, value.s);
                break;

            case JDWP_TAG(BOOLEAN):
                value.z = inStream_readBoolean(in);
                error = JVMTI_FUNC_PTR(gdata->jvmti,SetLocalInt)
                                (gdata->jvmti, thread, fnum, slot, value.z);
                break;

            default:
                return JDWP_ERROR(INVALID_TAG);
        }
    }

    return map2jdwpError(error);
}

static jboolean
getValues(PacketInputStream *in, PacketOutputStream *out)
{
    JNIEnv *env;
    int i;
    jdwpError serror;
    jthread thread;
    FrameID frame;
    jint variableCount;

    env = getEnv();

    thread = inStream_readThreadRef(env, in);
    if (inStream_error(in)) {
        return JNI_TRUE;
    }
    frame = inStream_readFrameID(in);
    if (inStream_error(in)) {
        return JNI_TRUE;
    }
    variableCount = inStream_readInt(in);
    if (inStream_error(in)) {
        return JNI_TRUE;
    }

    /*
     * Validate the frame id
     */
    serror = validateThreadFrame(thread, frame);
    if (serror != JDWP_ERROR(NONE)) {
        outStream_setError(out, serror);
        return JNI_TRUE;
    }

    (void)outStream_writeInt(out, variableCount);
    for (i = 0; (i < variableCount) && !outStream_error(out); i++) {
        jint slot;
        jbyte typeKey;
        FrameNumber fnum;

        slot = inStream_readInt(in);
        if (inStream_error(in))
            break;
        typeKey = inStream_readByte(in);
        if (inStream_error(in))
            break;

        fnum = getFrameNumber(frame);
        serror = writeVariableValue(env, out, thread, fnum, slot, typeKey);
        if (serror != JDWP_ERROR(NONE)) {
            outStream_setError(out, serror);
            break;
        }
    }

    return JNI_TRUE;
}

static jboolean
setValues(PacketInputStream *in, PacketOutputStream *out)
{
    JNIEnv *env;
    jint i;
    jdwpError serror;
    jthread thread;
    FrameID frame;
    jint variableCount;

    env = getEnv();

    thread = inStream_readThreadRef(env, in);
    if (inStream_error(in)) {
        return JNI_TRUE;
    }
    frame = inStream_readFrameID(in);
    if (inStream_error(in)) {
        return JNI_TRUE;
    }
    variableCount = inStream_readInt(in);
    if (inStream_error(in)) {
        return JNI_TRUE;
    }

    /*
     * Validate the frame id
     */
    serror = validateThreadFrame(thread, frame);
    if (serror != JDWP_ERROR(NONE)) {
        outStream_setError(out, serror);
        return JNI_TRUE;
    }

    for (i = 0; (i < variableCount) && !inStream_error(in); i++) {

        jint slot;
        jbyte typeKey;
        FrameNumber fnum;

        slot = inStream_readInt(in);
        if (inStream_error(in)) {
            return JNI_TRUE;
        }
        typeKey = inStream_readByte(in);
        if (inStream_error(in)) {
            return JNI_TRUE;
        }

        fnum = getFrameNumber(frame);
        serror = readVariableValue(env, in, thread, fnum, slot, typeKey);
        if (serror != JDWP_ERROR(NONE))
            break;
    }

    if (serror != JDWP_ERROR(NONE)) {
        outStream_setError(out, serror);
    }

    return JNI_TRUE;
}

static jboolean
thisObject(PacketInputStream *in, PacketOutputStream *out)
{
    JNIEnv *env;
    jdwpError serror;
    jthread thread;
    FrameID frame;

    env = getEnv();

    thread = inStream_readThreadRef(env, in);
    if (inStream_error(in)) {
        return JNI_TRUE;
    }

    frame = inStream_readFrameID(in);
    if (inStream_error(in)) {
        return JNI_TRUE;
    }

    /*
     * Validate the frame id
     */
    serror = validateThreadFrame(thread, frame);
    if (serror != JDWP_ERROR(NONE)) {
        outStream_setError(out, serror);
        return JNI_TRUE;
    }

    WITH_LOCAL_REFS(env, 2) {

        jvmtiError error;
        jmethodID method;
        jlocation location;
        FrameNumber fnum;

        /*
         * Find out if the given frame is for a static or native method.
         */
        fnum = getFrameNumber(frame);
        error = JVMTI_FUNC_PTR(gdata->jvmti,GetFrameLocation)
                (gdata->jvmti, thread, fnum, &method, &location);
        if (error == JVMTI_ERROR_NONE) {

            jint modifiers;

            error = methodModifiers(method, &modifiers);
            if (error == JVMTI_ERROR_NONE) {

                jobject this_object;

                /*
                 * Return null for static or native methods; otherwise, the JVM
                 * spec guarantees that "this" is in slot 0
                 */
                if (modifiers & (MOD_STATIC | MOD_NATIVE)) {
                    this_object = NULL;
                    (void)outStream_writeByte(out, specificTypeKey(env, this_object));
                    (void)outStream_writeObjectRef(env, out, this_object);
                } else {
                    error = JVMTI_FUNC_PTR(gdata->jvmti,GetLocalObject)
                                (gdata->jvmti, thread, fnum, 0, &this_object);
                    if (error == JVMTI_ERROR_NONE) {
                        (void)outStream_writeByte(out, specificTypeKey(env, this_object));
                        (void)outStream_writeObjectRef(env, out, this_object);
                    }
                }

            }
        }
        serror = map2jdwpError(error);

    } END_WITH_LOCAL_REFS(env);

    if (serror != JDWP_ERROR(NONE))
        outStream_setError(out, serror);

    return JNI_TRUE;
}

static jboolean
popFrames(PacketInputStream *in, PacketOutputStream *out)
{
    jvmtiError error;
    jdwpError serror;
    jthread thread;
    FrameID frame;
    FrameNumber fnum;

    thread = inStream_readThreadRef(getEnv(), in);
    if (inStream_error(in)) {
        return JNI_TRUE;
    }

    frame = inStream_readFrameID(in);
    if (inStream_error(in)) {
        return JNI_TRUE;
    }

    /*
     * Validate the frame id
     */
    serror = validateThreadFrame(thread, frame);
    if (serror != JDWP_ERROR(NONE)) {
        outStream_setError(out, serror);
        return JNI_TRUE;
    }

    if (threadControl_isDebugThread(thread)) {
        outStream_setError(out, JDWP_ERROR(INVALID_THREAD));
        return JNI_TRUE;
    }

    fnum = getFrameNumber(frame);
    error = threadControl_popFrames(thread, fnum);
    if (error != JVMTI_ERROR_NONE) {
        serror = map2jdwpError(error);
        outStream_setError(out, serror);
    }
    return JNI_TRUE;
}

void *StackFrame_Cmds[] = { (void *)0x4
    ,(void *)getValues
    ,(void *)setValues
    ,(void *)thisObject
    ,(void *)popFrames
};

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