[Swig-user] Crash when calling virtual methods

[Lönnstedt P. <pet...@sa...>]

Hi,

I am performing a test by developing an example in Eclipse on Linux (CentOS) in C++ (gcc-4.1.2-46) that I call from Java (java-1.6.0-openjdk). The example works fine on Windows XP.

In my test program in Java: When my class calls an implented virtual method (declared pure virtual in the base class) I get the following error:


#  SIGSEGV (0xb) at pc=0x0028f1f2, pid=31174, tid=3086662544
#
# Java VM: OpenJDK Server VM (1.6.0-b09 mixed mode linux-x86)
# Problematic frame:
# C  [libSwigTestSharedLib.so+0x11f2]  Java_exampleJNI_JavaCircle_1perimeter+0x12
#
# An error report file with more information is saved as:
# /home/stpeln/swig/example_test/workspace/SwigTest/hs_err_pid31174.log
#
# If you would like to submit a bug report, please visit:
#   http://icedtea.classpath.org/bugzilla
# The crash happened outside the Java Virtual Machine in native code.
# See problematic frame for where to report the bug.

There is no problem to call non-virtual methods that are implemented in the base class as well as methods implemented in the class itself.

Another problem is that when I declare static members, swig wraps this in order but my Java code cannot even load the generated library (the System.loadLibrary command fails).

This is my C++ code:

#ifndef __test_shape_h
#define __test_shape_h

class JavaShape {
public:
  JavaShape();
  virtual ~JavaShape();
  double  x, y;
  void    move(double dx, double dy);
  virtual double area() = 0;
  virtual double perimeter() = 0;
};

#endif




#ifndef __test_circle_h
#define __test_circle_h

#include "test_shape.h"

class JavaCircle : public JavaShape {
private:
  double radius;
public:
  JavaCircle(double r);
  // Implemented in this class:
  virtual double area();
  virtual double perimeter();
  int myInt();
};

#endif

This is my Java code:

JavaCircle myCircle = new JavaCircle(3);
// This works fine.
myCircle.move(1.0, 2.0);
myCircle.myInt();
// This crashes the program:
myCircle.area();


Would be great if anyone has an explanation for this!

Thanks,

/ Petter