Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!mit-eddie!uw-beaver!uw-june!june.cs.washington.edu!klaiber
From: klaiber@june.cs.washington.edu (Alexander Klaiber)
Newsgroups: gnu.g++.bug
Subject: g++ 1.36.1 bug
Keywords: new, ___builtin_new, clobber stack
Message-ID: <9823@june.cs.washington.edu>
Date: 16 Nov 89 10:51:03 GMT
Sender: klaiber@cs.washington.edu
Reply-To: klaiber@june.cs.washington.edu (Alexander Klaiber)
Organization: U of Washington, Computer Science, Seattle
Lines: 64


I ran into a bug related to the "new" operation:

=============================================================================

    #include "stdio.h"

    class Foo {
    private:
	char* name;
    public:
	Foo(char* s);
	check(int, Foo* f, int);
    };


    Foo::Foo(char* s) {
	name = s;
    }


    Foo::check(int a, Foo* f, int b) {
	printf("%d %d %d\n", a, (int)f, b);
    }


    main() {
	Foo a("test");
	a.check(1, new Foo("crash"), 2);
    }

    -------------------------------------------------------------------------

    [uw-larry - 120] % g++ main.c
    [uw-larry - 121] % a.out
    1 148520 148520

=============================================================================

Apparently the stack gets clobbered by the "new" operation.  If I change
the main program as show below, things work fine

=============================================================================

    main() {
	Foo a("test");
	Foo* b = new Foo("crash");
	a.check(1, b, 2);
    }

    -------------------------------------------------------------------------

    [uw-larry - 124] % g++ other.c
    [uw-larry - 125] % a.out
    1 148520 2

=============================================================================

g++ version 1.36.1 (based on GCC 1.36)
Sun3, os3

Any help would be **GREATLY** appreciated...

	Alex