No Symbols Loaded: libmex.pdb not loaded (throw_segv_longjmp_seh_filter() = EXCEPTION_CONTINUE_SEARCH : C++ exception)

问题

In order to create a MEX function and use it in my MATLAB code, like this:

[pow,index] = mx_minimum_power(A11,A12,A13,A22,A23,A33);

I've created the file mx_minimum_power.cpp and written the following code in it:

#include <math.h>
#include <complex>
#include "mex.h"
#include "matrix.h"
#include "cvm.h"
#include "blas.h"
#include "cfun.h"

using std::complex;
using namespace cvm;

/* The gateway function */
void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[])
{
    const int arraysize = 62172;
    const int matrixDimention = 3;
    float *inMatrixA11 = (float *)mxGetPr(prhs[0]);
    complex<float> *inMatrixA12 = (complex<float> *)mxGetPr(prhs[1]);
    complex<float> *inMatrixA13 = (complex<float> *)mxGetPr(prhs[2]);
    float *inMatrixA22 = (float *)mxGetPr(prhs[3]);
    complex<float> *inMatrixA23 = (complex<float> *)mxGetPr(prhs[4]);
    float *inMatrixA33 = (float *)mxGetPr(prhs[5]);
    basic_schmatrix< float, complex<float> > A(matrixDimention);
    int i = 0;
    for (i = 0; i < arraysize; i++)
    {
        A.set(1, 1, inMatrixA11[i]);
        A.set(1, 2, inMatrixA12[i]);
        A.set(1, 3, inMatrixA13[i]);
        A.set(2, 2, inMatrixA22[i]);
        A.set(2, 3, inMatrixA23[i]);
        A.set(3, 3, inMatrixA33[i]);
    }
}

And then in order to be able to debug the code, I've created the mx_minimum_power.pdb and mx_minimum_power.mexw64 files, using the following code in the Matlab Command Window:

mex -g mx_minimum_power.cpp cvm_em64t_debug.lib

The files blas.h, cfun.h, cvm.h and cvm_em64t_debug.lib are in the same directory as mx_minimum_power.cpp.
They are the headers and library files of the CVM Class Library.

Then I've attached MATLAB.exe to Visual Studio 2013, using the way explained here.
and have set a breakpoint at line40:

When I run my MATLAB code, there's no error until the specified line.

But if I click on the Step Over button, I'll encounter the following message:

With the following information added to the Output:

First-chance exception at 0x000007FEFCAE9E5D in MATLAB.exe: Microsoft C++ exception: cvm::cvmexception at memory location 0x0000000004022570.
> throw_segv_longjmp_seh_filter()
throw_segv_longjmp_seh_filter(): C++ exception
< throw_segv_longjmp_seh_filter() = EXCEPTION_CONTINUE_SEARCH

Can you suggest me why libmex.pdb is needed at that line and how should I solve the issue?

If I stop debugging, I'll get the following information in MATLAB Command Window:

Unexpected Standard exception from MEX file.
What() is:First index value 0 is out of [1,4) range

Right before pressing the step over button, we have the following values for A11[0],A12[0],A13[0],A22[0],A23[0],A33[0]:

that are just right as my expectations, according to what MATLAB passes to the MEX function:

Maybe the problem is because of wrong allocation for matrix A, it is as follows just before pressing the step over button.

回答1:

The problem occurs because we have the following code in lines 48 to 53 of the cvm.h file:

// 5.7 0-based indexing
#if defined (CVM_ZERO_BASED)
#   define CVM0 TINT_ZERO //!< Index base, 1  by default or 0 when \c CVM_ZERO_BASED is defined
#else
#   define CVM0 TINT_ONE  //!< Index base, 1  by default or 0 when \c CVM_ZERO_BASED is defined
#endif

That makes CVM0 = 1 by default. So if we press the Step Into(F11) button at the specified line two times, we will get into line 34883 of the file cvm.h:

basic_schmatrix& set(tint nRow, tint nCol, TC c) throw(cvmexception)
{
    this->_set_at(nRow - CVM0, nCol - CVM0, c);
    return *this;
}

Press Step Into(F11) at line this->_set_at(nRow - CVM0, nCol - CVM0, c); and you'll go to the definition of the function _set_at:

// sets both elements to keep matrix hermitian, checks ranges
// zero based
void _set_at(tint nRow, tint nCol, TC val) throw(cvmexception)
{
    _check_lt_ge(CVM_OUTOFRANGE_LTGE1, nRow, CVM0, this->msize() + CVM0);
    _check_lt_ge(CVM_OUTOFRANGE_LTGE2, nCol, CVM0, this->nsize() + CVM0);
    if (nRow == nCol && _abs(val.imag()) > basic_cvmMachMin<TR>()) { // only reals on main diagonal
        throw cvmexception(CVM_BREAKS_HERMITIANITY, "real number");
    }
    this->get()[this->ld() * nCol + nRow] = val;
    if (nRow != nCol) {
        this->get()[this->ld() * nRow + nCol] = _conjugate(val);
    }
}

pressing Step Over(F10) button,you'll get the result:

so in order to get nRow=1 and nCol=1 and not nRow=0 and nCol=0, which is out of the range [1,4), you should write that line of code as:

A.set(2, 2, inMatrixA11[i]);

来源：https://stackoverflow.com/questions/39416779/no-symbols-loaded-libmex-pdb-not-loaded-throw-segv-longjmp-seh-filter-exce

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matlab

exception

visual-c++

mex

pdb-files