Hi there,
i am not sure this is a C++ problem or that of the gdb I am using.
basically i could not step into a class function with correct
'this' pointer.
I either got
this = <incomplete type> or
this = <error type>
as shown in the screen copy below.
The problem seems to narrow down to the
usage of <stdio.h>. If this line is commented out, everything is ok.
I can see the 'this' pointer when steping into the
'Image' constructor.
however, whenever <stdio.h> is there, i am in trouble. I tried <cstdio>
or extern "C". same problems persist.
I am not sure whether only 'stdio.h' makes trouble or all old style
c header files.
Your help will be greatly appreciated.
Thanks in advance,
Wenqing
---------------------------debug session----------------------------
/lhome/wen/usc/philemon/samples% gdb waveFT
GDB is free software and you are welcome to distribute copies of it
under certain conditions; type "show copying" to see the conditions.
There is absolutely no warranty for GDB; type "show warranty" for
details.
GDB 4.16 (sparc-sun-solaris2.5), Copyright 1996 Free Software
Foundation, Inc...
(gdb) list
1 #include <cstdio>
2
3 #include "WWimage.hh"
4
5
6
7
8 int main (int argc, char **argv)
9 {
10 char *program = argv[0];
(gdb)
11
12 int hsize = 512;
13 int vsize = 512;
14
15 // Load the image to be coded
16 Image *image = new Image ("myfile.img", hsize, vsize);
17
18 //std::printf("this is good\n");
19 delete image;
20
(gdb) break 16
Breakpoint 1 at 0x1098c: file waveFT.cc, line 16.
(gdb) run
Starting program: /lhome/wen/usc/philemon/samples/waveFT
..login SOLARIS 2.x
warning: Unable to find dynamic linker breakpoint function.
warning: GDB will be unable to debug shared library initializers
warning: and track explicitly loaded dynamic code.
Breakpoint 1, main (argc=1, argv=0xeffff20c) at waveFT.cc:16
16 Image *image = new Image ("myfile.img", hsize, vsize);
(gdb) step
Image::Image (this=<incomplete type>, filename=0x10cf8 "myfile.img",
new_hsize=512,
new_vsize=512) at WWimage.cc:28
28 Image::Image (const char *filename, int new_hsize, int
new_vsize) :
(gdb)
----------------------------------------------------------------------------------------------
//-----------main function--------------------------
#include <cstdio>
#include "WWimage.hh"
int main (int argc, char **argv)
{
char *program = argv[0];
int hsize = 512;
int vsize = 512;
// Load the image to be coded
Image *image = new Image ("myfile.img", hsize, vsize);
//std::printf("this is good\n");
delete image;
return 0;
}
-------------------WWimage.hh--------------------------------------
ifndef _IMAGE_
#define _IMAGE_
class Image {
public:
// Loads an image of size hsize by vsize from the specified file
// The file is assumed to contain an image in raw byte format
Image (const char *filename, int hsize, int vsize = -1);
~Image();// { delete [] value;}
private:
int hsize;
int vsize;
float * value;
};
#endif
------------------WWimage.cc-------------------------------------------------------
#include <iostream>
#include "WWimage.hh"
Image::Image (const char *filename, int new_hsize, int new_vsize) :
hsize(new_hsize), vsize(new_vsize)
{
if (hsize == -1)
hsize = vsize = 0;
if (vsize == -1)
vsize = hsize;
value = new float [hsize*vsize];
if (!value )
cout << "Can't allocate memory for image" << endl;
}
Image::~Image() {
delete [] value;
}
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