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Editorial Team
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Asked: 2026-06-03T18:31:53+00:00

I found an article by Vikram Aggarwal that talks about linking Assembly code into

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I found an article by Vikram Aggarwal that talks about linking Assembly code into Android’s NDK, which even has some example code which shows how to connect the C++ code with Assembly.
( see http://www.eggwall.com/2011/09/android-arm-assembly-calling-assembly.html )

My problem is that I want to use the same function but instead of calling it from JNI stub class, I want to call my Assembly function from my private class.

But on compilation, I get the error:

error: 'armFunction' was not declared in this scope

Has anyone tried this or have any idea how to resolve this ?

Edit:

Makefile:

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := quake3

# I want ARM, not thumb.
LOCAL_ARM_MODE := arm    

LOCAL_SRC_FILES := \
    multiple.s \
    macros.h \
    math/Vector2.cpp\
    math/Vector3.cpp\
    math/plane.cpp\
    engine/frustum.cpp\
    engine/BoundingVolume.cpp\
    engine/camera.cpp\
    camera-proxy.cpp\

LOCAL_CFLAGS := -DANDROID_NDK \
                -DDISABLE_IMPORTGL \

LOCAL_LDLIBS := -lGLESv1_CM -ldl -llog
#LOCAL_LDLIBS := -llog -lGLESv2

APP_STL := gnustl_static
APP_CPPFLAGS := -S -frtti -fexceptions
APP_ABI := armeabi armeabi-v7a

include $(BUILD_SHARED_LIBRARY)

Function call in cpp file:

void
Java_surreal_quake3_engine_Camera9_nativeGetDirection(JNIEnv* env, jobject thiz)
{
    //Camera* camera = (Camera*) env->GetIntField(thiz, pointerID);

    // get the _Z as the Vector3 java object
    jfieldID vector_fID = env->GetFieldID(cls, "_Z", "Lsurreal/libs/math/Vector3;");
    jobject vector_obj = env->GetObjectField(thiz, vector_fID);

    // call the setter methods on the _vecEye
        //jclass vectorClass = env->FindClass("surreal/libs/math/Vector3");
    jmethodID vector3_set = env->GetMethodID(vector3Class, "set"/*method-name*/, "(FFF)V" /*method-signature*/);
    env->CallVoidMethod(vector_obj, vector3_set, camera->getZ().x, camera->getZ().y, camera->getZ().z);

    int result = armFunction();
}
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1 Answer

  1. Editorial Team

    Looking at the code of the class, it seems like you call the function, but I can’t see any declaration of it, so it is not recognized. So you need to have a declaration of the function’s prototype before calling it (in the C++ class):

    Something like:

    int armFunction(void); // << declaration

void Java_surreal_quake3_engine_Camera9_nativeGetDirection(JNIEnv* env, jobject thiz)
{
    // snip - snap
    int result = armFunction(); // << your function call
}
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