C++ (Cpp) MEMBER_OFFSET_COPY Examples

Example #1

File: xposed.cpp Project: ShiningDrops/Xposed

static void xposedInitMemberOffsets() {
    PTR_gDvmJit = dlsym(RTLD_DEFAULT, "gDvmJit");

    if (PTR_gDvmJit == NULL) {
        offsetMode = MEMBER_OFFSET_MODE_NO_JIT;
    } else {
        offsetMode = MEMBER_OFFSET_MODE_WITH_JIT;
    }
    ALOGD("Using structure member offsets for mode %s", xposedOffsetModesDesc[offsetMode]);

    MEMBER_OFFSET_COPY(Thread, jniLocalRefTable);
    MEMBER_OFFSET_COPY(Thread, status);
    MEMBER_OFFSET_COPY(Thread, jniEnv);
    MEMBER_OFFSET_COPY(DvmJitGlobals, codeCacheFull);
}

Example #2

File: xposed.cpp Project: BillKalin/Xposed

static bool xposedInitMemberOffsets(JNIEnv* env) {
    PTR_gDvmJit = dlsym(RTLD_DEFAULT, "gDvmJit");

    if (PTR_gDvmJit == NULL) {
        offsetMode = MEMBER_OFFSET_MODE_NO_JIT;
    } else {
        offsetMode = MEMBER_OFFSET_MODE_WITH_JIT;
    }
    ALOGD("Using structure member offsets for mode %s", xposedOffsetModesDesc[offsetMode]);

    MEMBER_OFFSET_COPY(DvmJitGlobals, codeCacheFull);

    int overrideCodeCacheFull = xposedReadIntConfig(XPOSED_OVERRIDE_JIT_RESET_OFFSET, -1);
    if (overrideCodeCacheFull > 0 && overrideCodeCacheFull < 0x400) {
        ALOGI("Offset for DvmJitGlobals.codeCacheFull is overridden, new value is 0x%x", overrideCodeCacheFull);
        MEMBER_OFFSET_VAR(DvmJitGlobals, codeCacheFull) = overrideCodeCacheFull;
    }

    // detect offset of ArrayObject->contents
    jintArray dummyArray = env->NewIntArray(1);
    if (dummyArray == NULL) {
        ALOGE("Could allocate int array for testing");
        dvmLogExceptionStackTrace();
        env->ExceptionClear();
        return false;
    }

    jint* dummyArrayElements = env->GetIntArrayElements(dummyArray, NULL);
    arrayContentsOffset = (size_t)dummyArrayElements - (size_t)dvmDecodeIndirectRef(dvmThreadSelf(), dummyArray);
    env->ReleaseIntArrayElements(dummyArray,dummyArrayElements, 0);
    env->DeleteLocalRef(dummyArray);

    if (arrayContentsOffset < 12 || arrayContentsOffset > 128) {
        ALOGE("Detected strange offset %d of ArrayObject->contents", arrayContentsOffset);
        return false;
    }

    return true;
}