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digitalmars.D.bugs - [Issue 4554] New: accepts-invalid Cyclic constructor calls cause stack overflow

reply d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=4554

           Summary: accepts-invalid Cyclic constructor calls cause stack
                    overflow
           Product: D
           Version: D2
          Platform: Other
        OS/Version: Windows
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: andrej.mitrovich gmail.com



13:45:41 PDT ---
On this page:

http://www.digitalmars.com/d/2.0/class.html

It states "It is illegal for constructors to mutually call each other". This
will compile and cause a stack overflow:

import std.stdio;

class C {
    this() { this(1); }
    this(int i) { this(); }    // illegal, cyclic constructor calls
}

void main() {
    C c = new C;
}

object.Error: Stack Overflow

Isn't it possible to make this a compiler error? Or maybe this is a form of a
halting-problem and can't be fixed? :)

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Aug 01 2010
next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=4554


Don <clugdbug yahoo.com.au> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |clugdbug yahoo.com.au





 On this page:
 
 http://www.digitalmars.com/d/2.0/class.html
 
 It states "It is illegal for constructors to mutually call each other". This
 will compile and cause a stack overflow:
 
 import std.stdio;
 
 class C {
     this() { this(1); }
     this(int i) { this(); }    // illegal, cyclic constructor calls
 }
 
 void main() {
     C c = new C;
 }
 
 object.Error: Stack Overflow
 
 Isn't it possible to make this a compiler error? Or maybe this is a form of a
 halting-problem and can't be fixed? :)


I guess the compiler could set up a dependency tree of constructor calls, and
check for cycles. Quite a bit of work.

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Aug 13 2010
prev sibling next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=4554


Andrej Mitrovic <andrej.mitrovich gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |INVALID



11:20:47 PST ---
Page now reads:
"It is illegal for constructors to mutually call each other, although the
compiler is not required to detect it."

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Jan 29 2012
prev sibling next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=4554


yebblies <yebblies gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
                 CC|                            |yebblies gmail.com
           Platform|Other                       |All
         Resolution|INVALID                     |
         OS/Version|Windows                     |All
           Severity|normal                      |enhancement



I think this is worth asking for.

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Jan 30 2012
prev sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=4554


Walter Bright <bugzilla digitalmars.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |RESOLVED
                 CC|                            |bugzilla digitalmars.com
         Resolution|                            |WONTFIX



01:22:00 PST ---
It's technically not a solvable problem in the general case. I think it's the
halting problem.

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