jna wrapping shared .so library - access class

Question

I have an opensource shared library called libmbc.so. I am interested in using this library in a java implementation which should be able to reproduce a behavior already tested in c++. Ideally I aim to have access to a class in this library called MBCNodal, and call its member functions in the java wrapper. If I unroll the content of the shared library with nm -gC libmbc.so, I obtain the following

                 U __assert_fail@@GLIBC_2.2.5
                 U bind@@GLIBC_2.2.5
000000000020e278 B __bss_start
                 U close@@GLIBC_2.2.5
                 U connect@@GLIBC_2.2.5
                 w __cxa_finalize@@GLIBC_2.2.5
                 U __cxa_pure_virtual@@CXXABI_1.3
                 U __cxa_rethrow@@CXXABI_1.3
000000000020e278 D _edata
000000000020e280 B _end
                 U __errno_location@@GLIBC_2.2.5
0000000000009ab0 T _fini
                 U fprintf@@GLIBC_2.2.5
                 U freeaddrinfo@@GLIBC_2.2.5
                 U free@@GLIBC_2.2.5
                 U fwrite@@GLIBC_2.2.5
                 U getaddrinfo@@GLIBC_2.2.5
                 w __gmon_start__
                 U __gxx_personality_v0@@CXXABI_1.3
0000000000003db8 T _init
                 w _ITM_deregisterTMCloneTable
                 w _ITM_registerTMCloneTable
                 w _Jv_RegisterClasses
                 U malloc@@GLIBC_2.2.5
0000000000004670 T mbc_check_cmd
000000000020e27c B mbc_dummy
00000000000046c0 T mbc_get_cmd
0000000000004850 T mbc_inet_init
0000000000005f60 T mbc_modal_destroy
0000000000005690 T mbc_modal_get_motion
0000000000005a40 T mbc_modal_init
0000000000005b90 T mbc_modal_negotiate_request
0000000000005db0 T mbc_modal_negotiate_response
00000000000058d0 T mbc_modal_put_forces
00000000000055d0 T mbc_nodal_destroy
0000000000004970 T mbc_nodal_get_motion
0000000000004c30 T mbc_nodal_init
00000000000051d0 T mbc_nodal_negotiate_request
00000000000053f0 T mbc_nodal_negotiate_response
0000000000004b30 T mbc_nodal_put_forces
0000000000004720 T mbc_put_cmd
00000000000048f0 T mbc_unix_init
00000000000097a0 T mbdyn_host2inet_addr
0000000000009980 T mbdyn_make_inet_socket
0000000000009890 T mbdyn_make_inet_socket_type
0000000000009aa0 T mbdyn_make_named_socket
00000000000099a0 T mbdyn_make_named_socket_type
                 U recv@@GLIBC_2.2.5
                 U send@@GLIBC_2.2.5
                 U snprintf@@GLIBC_2.2.5
                 U socket@@GLIBC_2.2.5
                 U stderr@@GLIBC_2.2.5
                 U stdout@@GLIBC_2.2.5
                 U strerror@@GLIBC_2.2.5
                 U strlen@@GLIBC_2.2.5
                 U strncpy@@GLIBC_2.2.5
                 U _Unwind_Resume@@GCC_3.0
                 U usleep@@GLIBC_2.2.5
                 U operator delete(void*, unsigned long)@@CXXABI_1.3.9
0000000000006000 T MBCBase::SetTimeout(int)
0000000000006010 T MBCBase::SetVerbose(bool)
0000000000007710 T MBCBase::DynamicsLabel()
0000000000006020 T MBCBase::SetDataAndNext(bool)
0000000000007a20 T MBCBase::F(unsigned char)
0000000000007bf0 T MBCBase::M(unsigned char)
00000000000064b0 T MBCBase::Init(char const*)
0000000000006510 T MBCBase::Init(char const*, unsigned short)
00000000000062b0 T MBCBase::SetStatus(MBCBase::Status)
00000000000063e0 T MBCBase::MBCBase()
00000000000063e0 T MBCBase::MBCBase()
0000000000006490 T MBCBase::~MBCBase()
0000000000006400 T MBCBase::~MBCBase()
0000000000006400 T MBCBase::~MBCBase()
0000000000009310 T MBCModal::Initialize(MBCBase::Rot, unsigned int)
0000000000009490 T MBCModal::DynamicsLabel()
00000000000094b0 T MBCModal::F(unsigned char)
00000000000094d0 T MBCModal::M(unsigned char)
0000000000009730 T MBCModal::P(unsigned int)
00000000000093a0 T MBCModal::MBCModal(MBCBase::Rot, unsigned int)
00000000000092c0 T MBCModal::MBCModal()
00000000000093a0 T MBCModal::MBCModal(MBCBase::Rot, unsigned int)
00000000000092c0 T MBCModal::MBCModal()
0000000000006470 T MBCModal::~MBCModal()
0000000000006450 T MBCModal::~MBCModal()
0000000000006450 T MBCModal::~MBCModal()
0000000000007d40 T MBCNodal::Initialize(MBCBase::Rot, unsigned int, bool, MBCBase::Rot, bool)
0000000000008e60 T MBCNodal::DynamicsLabel(unsigned int)
0000000000007f20 T MBCNodal::DynamicsLabel()
0000000000007f40 T MBCNodal::F(unsigned char)
0000000000009110 T MBCNodal::F(unsigned int, unsigned char)
0000000000007f60 T MBCNodal::M(unsigned char)
0000000000009220 T MBCNodal::M(unsigned int, unsigned char)
0000000000007e00 T MBCNodal::MBCNodal(MBCBase::Rot, unsigned int, bool, MBCBase::Rot, bool)
0000000000007cf0 T MBCNodal::MBCNodal()
0000000000007e00 T MBCNodal::MBCNodal(MBCBase::Rot, unsigned int, bool, MBCBase::Rot, bool)
0000000000007cf0 T MBCNodal::MBCNodal()
0000000000006430 T MBCNodal::~MBCNodal()
0000000000006410 T MBCNodal::~MBCNodal()
0000000000006410 T MBCNodal::~MBCNodal()
00000000000077c0 T MBCBase::GetRefNodeF() const
0000000000007870 T MBCBase::GetRefNodeM() const
0000000000006780 T MBCBase::GetRefNodeR() const
00000000000066d0 T MBCBase::GetRefNodeX() const
0000000000006050 T MBCBase::bDataAndNext() const
0000000000006a20 T MBCBase::GetRefNodeXP() const
0000000000007660 T MBCBase::DynamicsLabel() const
0000000000006100 T MBCBase::GetRefNodeRot() const
0000000000006bb0 T MBCBase::GetRefNodeXPP() const
0000000000006150 T MBCBase::bAccelerations() const
0000000000006ad0 T MBCBase::GetRefNodeOmega() const
0000000000006860 T MBCBase::GetRefNodeTheta() const
0000000000006620 T MBCBase::KinematicsLabel() const
0000000000006c90 T MBCBase::GetRefNodeOmegaP() const
0000000000006940 T MBCBase::GetRefNodeEuler123() const
0000000000007950 T MBCBase::F(unsigned char) const
0000000000007af0 T MBCBase::M(unsigned char) const
0000000000006e60 T MBCBase::R(unsigned char, unsigned char) const
0000000000006d90 T MBCBase::X(unsigned char) const
00000000000075b0 T MBCBase::GetRefNodeDynamicsLabel() const
00000000000065a0 T MBCBase::GetRefNodeKinematicsLabel() const
00000000000071b0 T MBCBase::XP(unsigned char) const
0000000000007380 T MBCBase::XPP(unsigned char) const
0000000000007280 T MBCBase::Omega(unsigned char) const
0000000000006fb0 T MBCBase::Theta(unsigned char) const
0000000000006580 T MBCBase::GetCmd() const
0000000000006080 T MBCBase::GetRot() const
0000000000007480 T MBCBase::OmegaP(unsigned char) const
0000000000006190 T MBCBase::bLabels() const
00000000000060c0 T MBCBase::bRefNode() const
0000000000006030 T MBCBase::bVerbose() const
00000000000070b0 T MBCBase::Euler123(unsigned char) const
0000000000006070 T MBCBase::GetStatus() const
0000000000005fd0 T MBCModal::GetBasePtr() const
0000000000009480 T MBCModal::DynamicsLabel() const
0000000000005fe0 T MBCModal::GetRefNodePtr() const
00000000000093f0 T MBCModal::KinematicsLabel() const
00000000000094a0 T MBCModal::F(unsigned char) const
00000000000094c0 T MBCModal::M(unsigned char) const
00000000000096c0 T MBCModal::P(unsigned int) const
00000000000095a0 T MBCModal::Q(unsigned int) const
0000000000009410 T MBCModal::R(unsigned char, unsigned char) const
0000000000009400 T MBCModal::X(unsigned char) const
0000000000009600 T MBCModal::QP(unsigned int) const
0000000000009440 T MBCModal::XP(unsigned char) const
0000000000009460 T MBCModal::XPP(unsigned char) const
0000000000009670 T MBCModal::GetP() const
0000000000009520 T MBCModal::GetQ() const
00000000000063a0 T MBCModal::Close() const
0000000000009560 T MBCModal::GetQP() const
0000000000009450 T MBCModal::Omega(unsigned char) const
0000000000009420 T MBCModal::Theta(unsigned char) const
0000000000009470 T MBCModal::OmegaP(unsigned char) const
0000000000005ff0 T MBCModal::GetType() const
0000000000009430 T MBCModal::Euler123(unsigned char) const
00000000000094e0 T MBCModal::GetModes() const
0000000000006280 T MBCModal::GetMotion() const
0000000000006350 T MBCModal::Negotiate() const
0000000000006240 T MBCModal::PutForces(bool) const
0000000000005fa0 T MBCNodal::GetBasePtr() const
0000000000008af0 T MBCNodal::GetEuler123(unsigned int) const
0000000000008140 T MBCNodal::GetEuler123() const
0000000000008dd0 T MBCNodal::DynamicsLabel(unsigned int) const
0000000000007f10 T MBCNodal::DynamicsLabel() const
0000000000005fb0 T MBCNodal::GetRefNodePtr() const
0000000000008910 T MBCNodal::KinematicsLabel(unsigned int) const
0000000000007e80 T MBCNodal::KinematicsLabel() const
0000000000008d60 T MBCNodal::GetDynamicsLabel() const
0000000000008880 T MBCNodal::GetKinematicsLabel(unsigned int) const
0000000000007fb0 T MBCNodal::GetKinematicsLabel() const
0000000000007f30 T MBCNodal::F(unsigned char) const
00000000000090a0 T MBCNodal::F(unsigned int, unsigned char) const
0000000000007f50 T MBCNodal::M(unsigned char) const
0000000000009180 T MBCNodal::M(unsigned int, unsigned char) const
0000000000007ea0 T MBCNodal::R(unsigned char, unsigned char) const
00000000000083d0 T MBCNodal::R(unsigned int, unsigned char, unsigned char) const
0000000000007e90 T MBCNodal::X(unsigned char) const
0000000000008360 T MBCNodal::X(unsigned int, unsigned char) const
0000000000007ed0 T MBCNodal::XP(unsigned char) const
0000000000008600 T MBCNodal::XP(unsigned int, unsigned char) const
0000000000007ef0 T MBCNodal::XPP(unsigned char) const
0000000000008710 T MBCNodal::XPP(unsigned int, unsigned char) const
0000000000008fa0 T MBCNodal::GetF(unsigned int) const
0000000000008ef0 T MBCNodal::GetF() const
0000000000009010 T MBCNodal::GetM(unsigned int) const
0000000000008f30 T MBCNodal::GetM() const
00000000000089f0 T MBCNodal::GetR(unsigned int) const
0000000000008060 T MBCNodal::GetR() const
00000000000089a0 T MBCNodal::GetX(unsigned int) const
0000000000008020 T MBCNodal::GetX() const
0000000000006310 T MBCNodal::Close() const
0000000000008b70 T MBCNodal::GetXP(unsigned int) const
00000000000081b0 T MBCNodal::GetXP() const
0000000000007ee0 T MBCNodal::Omega(unsigned char) const
0000000000008670 T MBCNodal::Omega(unsigned int, unsigned char) const
0000000000007eb0 T MBCNodal::Theta(unsigned char) const
00000000000084a0 T MBCNodal::Theta(unsigned int, unsigned char) const
0000000000008c40 T MBCNodal::GetXPP(unsigned int) const
0000000000008260 T MBCNodal::GetXPP() const
0000000000007f00 T MBCNodal::OmegaP(unsigned char) const
00000000000087b0 T MBCNodal::OmegaP(unsigned int, unsigned char) const
0000000000005fc0 T MBCNodal::GetType() const
0000000000007ec0 T MBCNodal::Euler123(unsigned char) const
0000000000008550 T MBCNodal::Euler123(unsigned int, unsigned char) const
0000000000007f70 T MBCNodal::GetNodes() const
0000000000008bc0 T MBCNodal::GetOmega(unsigned int) const
00000000000081f0 T MBCNodal::GetOmega() const
0000000000008a70 T MBCNodal::GetTheta(unsigned int) const
00000000000080d0 T MBCNodal::GetTheta() const
0000000000006210 T MBCNodal::GetMotion() const
0000000000008cc0 T MBCNodal::GetOmegaP(unsigned int) const
00000000000082d0 T MBCNodal::GetOmegaP() const
00000000000062c0 T MBCNodal::Negotiate() const
00000000000061d0 T MBCNodal::PutForces(bool) const
000000000020dc48 V typeinfo for MBCBase
000000000020dc70 V typeinfo for MBCModal
000000000020dc58 V typeinfo for MBCNodal
000000000000b468 V typeinfo name for MBCBase
000000000000b488 V typeinfo name for MBCModal
000000000000b478 V typeinfo name for MBCNodal
000000000020dc88 V vtable for MBCBase
000000000020dd38 V vtable for MBCModal
000000000020dce0 V vtable for MBCNodal
                 U vtable for __cxxabiv1::__class_type_info@@CXXABI_1.3
                 U vtable for __cxxabiv1::__si_class_type_info@@CXXABI_1.3

Therefore I have the feeling that the MBCNodal class is somehow accessible with JNA. But I don't manage to figure out how?

I wish not to modify the library implementation. I have the source code of both .h and .cpp. But I don't know how it was compiled in order to produce the libmbc.so.

thanks for your help.

Edit:

here is a sample code on how I load the library and access the extern methods:

private interface Wrapper extends Library {

        Wrapper INSTANCE = Native.loadLibrary( C_LIBRARY_PATH, Wrapper.class );

        Pointer mbc_nodal_init(Pointer ptr, int refnode, int nodes, int label, int rot, int accels);

        int mbc_nodal_get_motion(Pointer ptr);

        int mbc_nodal_negotiate_request(Pointer ptr);

        int mbc_nodal_put_forces(Pointer ptr, int converged);


    }

jna wrapping shared .so library - access class

Answers (1)

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