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Article #1117

Bug in gcc 2.2.2 fuer C++ ??

#1117
From: Harald Leszke
Date: Mon, 09 Nov 1992 20:13
275 lines
5876 bytes
Hello!
I would like to implement an one time linked list in C++.
Every objekt is represented, by an struct 'node', containing data and link to 
the next objekt.
By assigning '=' the list is set empty and the new nodes are copied.
'+=' means, the nodes of the second list are copied and concatenated to the 
first list.

No problem using AT&T CC, but gcc has some serious problems at runtime.
Can anybody help ? 
Any patch aviable ?

Thanks in advance.
     
           Harald Leszke.


Runlisting:

Script started on Mon Nov  9 20:39:07 1992
warning: could not update utmp entry
21 (.../diploma/c++)>gcc -g -v gcc_test.cc
Reading specs from /usr/gnu/lib/gcc-lib/sun4/2.2.2/specs
gcc version 2.2.2
 /usr/gnu/lib/gcc-lib/sun4/2.2.2/cpp -lang-c++ -v -undef -D__GNUC__=2 -D__GNUG__=2 -D__cplusplus -Dsparc -Dsun -Dunix -D__sparc__ -D__sun__ -D__unix__ -D__sparc -D__sun -D__unix -g gcc_test.cc /usr/tmp/cca09048.i
GNU CPP version 2.2.2 (sparc)
 /usr/gnu/lib/gcc-lib/sun4/2.2.2/cc1plus /usr/tmp/cca09048.i -quiet -dumpbase gcc_test.cc -g -version -o /usr/tmp/cca09048.s
GNU C++ version 2.2.2 (sparc) compiled by GNU C version 2.2.2.
 as -o gcc_test.o /usr/tmp/cca09048.s
 /usr/gnu/lib/gcc-lib/sun4/2.2.2/ld -e start -dc -dp /lib/crt0.o -L/usr/gnu/lib/gcc-lib/sun4/2.2.2 -L/usr/gnu/lib gcc_test.o -lgcc -lc -lg -lgcc
22 (.../diploma/c++)>a.out
Wenn man diese Printanweisung auskommentiert -> Bus Error. 
Liste zwei:
100
99
98
Liste eins+zwei:
100
99
98
100
Die Liste hat nicht so viele Elemente!23 (.../diploma/c++)>
23 (.../diploma/c++)>/usr/lang/CC gcc
gcc_test.cc   gcc_test.cc~  gcc_test.s    
23 (.../diploma/c++)>/usr/lang/CC gcc_test.cc
24 (.../diploma/c++)>a.out
Wenn man diese Printanweisung auskommentiert -> Bus Error. 
Liste zwei:
100
99
98
Liste eins+zwei:
100
99
98
100
99
98
25 (.../diploma/c++)>^Dexit
script done on Mon Nov  9 20:42:54 1992



Listing:  ( Sorry comments and output in german language. )
========


#include<stdio.h> 
#include<stdlib.h> 
typedef int was;


class s_list {
  private: struct node{
                       node *next;
		       was   data;
		     };

  private:
    node *first;
    node *last;
    int   members;
    node *ack;
    int ack_nr;

  public:

    s_list();  // Constructor.
    ~s_list(); // Destructor

    was get(int);
    void append(was);

    s_list operator = (const s_list );
    s_list operator += (const s_list );
};


    s_list::s_list()
    {
      first=NULL;
      last=NULL;
      members=0;
      ack=NULL;
      ack_nr=0;
     };

   s_list::~s_list()
     {
       node *tmp1,*tmp2;
       
       tmp1=first;
       while(tmp1!=NULL)
	 {
	   tmp2=tmp1;
	   tmp1=(*tmp1).next;
	   delete(tmp2);
	 }
     }

    was s_list::get(int wo)
     {
       int count;
       node *searchnode;

       if (wo>members)
         {
	   printf("Die Liste hat nicht so viele Elemente!");
	   exit(1);
	 };
       if (wo<1)
         {
	   printf("Die Liste hat keine Elemente vor 1!");
	   exit(1);
	 };

       if (members==0)
         {
	   printf("Die Liste ist leer!");
	   exit(1);
	 };

      searchnode=first;
      for(count=1; count <wo; count++) searchnode=(*searchnode).next;

      return (*searchnode).data;
     }

    
    void s_list::append(was data)
     { 
       node *tmp,*tmp2;

       tmp2=last;
       tmp=new (node) ;
       (*tmp).data=data; 
       (*tmp).next=NULL;

       if(last!=NULL)
         {
	   (*last).next=tmp;
	   last=tmp;
	 }
       else
	 {
	   last=tmp;
	   first=tmp;
	   ack=tmp;
	   ack_nr=1;
	 }
       members++;
      }

    // insert fuegt an der Stelle ein, dh. insert(~,7) fuegt ~ bei 7 ein, das
    // ehemalige Element 7 ist jetzt Nummer 8. 




    s_list s_list::operator += (const s_list ein)
     {
       node *tmpein;

       if (ein.members==0) return *this;
       tmpein=ein.first;
       while(tmpein!=NULL)
         {
	   append((*tmpein).data);
	   tmpein=(*tmpein).next;
	 }

       return *this;
     }


   s_list s_list::operator =  (const s_list ein)
     {
       node *tmpein;

// Lassen wir den alten Schrott im Speicher haengen, da er den Fehler nicht 
// beruehert.

      first=NULL;
      last=NULL;
      members=0;
      ack=NULL;
      ack_nr=0;

       if (ein.members==0) return *this;  // neues anhaengen
       tmpein=ein.first;
       while(tmpein!=NULL)
         {
	   append((*tmpein).data);
	   tmpein=(*tmpein).next;
	 }

       return *this;
     }

  
main()
{
  s_list eins,zwei;
  int count;

  for (count=0;count<3;count++)
      {eins.append(100-count);};
  printf("Comenting this line out -> Bus Error. \n");

  zwei=eins;                // Wird mit append zugewiesen tritt der Fehler 
                            // nicht auf.
  printf("Liste zwei:\n");
  for (count=1;count<4;count++)
    printf("%i\n",zwei.get(count));

  zwei+=eins;

  printf("Liste eins+zwei:\n");
  for (count=1;count<7;count++)
    printf("%i\n",zwei.get(count));

}




























--
Harald Leszke,Goerzalle 131/305,D-1000 Berlin 45, Tel: +49 (0)30 8178570

Wer mit 18 noch kein Kommunist ist, hat kein Herz!
	Und wer mit 28 noch Kommunist ist, hat keinen Verstand.
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Message-ID: <1992Nov9.201321.22871@cs.tu-berlin.de>
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Path: arc1-ca.pugleaf.net!sparky!uunet!stanford.edu!agate!spool.mu.edu!sol.ctr.columbia.edu!zaphod.mps.ohio-state.edu!cis.ohio-state.edu!cs.tu-berlin.DE!leszke
From: leszke@cs.tu-berlin.DE (Harald Leszke)
Subject: Bug in gcc 2.2.2 fuer C++ ??
Message-ID: <1992Nov9.201321.22871@cs.tu-berlin.de>
Sender: gnulists@ai.mit.edu
Organization: Techn. University of Berlin, Germany
Distribution: gnu
Date: Mon, 9 Nov 1992 20:13:21 GMT
Approved: bug-g++@prep.ai.mit.edu
Lines: 276