Hello all,
I have a class member, which calls another member from the same class. The
problem I'm experiencing is that the nested function executes fine, but
causes a segmentation fault as it exits. I've traced it to the point in the
code just before the line following the nested function is to be called, or
conversely right after the last line of the nested function.
What might be my problem? I'm hoping someone can give me some guidance on
what sort of things to check. I can't even think where to start.
d
14  11688 
deancoo wrote: I have a class member, which calls another member from the same class. The
problem I'm experiencing is that the nested function executes fine, but
causes a segmentation fault as it exits. I've traced it to the point in the
code just before the line following the nested function is to be called, or
conversely right after the last line of the nested function.
What might be my problem? I'm hoping someone can give me some guidance on
what sort of things to check. I can't even think where to start.
Sounds like a garden variety memory overrun problem. You stomp over your
own call stack, most likely. Check writing beyond the bounds of an array.
V
deancoo schrieb: Hello all,
I have a class member, which calls another member from the same class. The
problem I'm experiencing is that the nested function executes fine, but
causes a segmentation fault as it exits. I've traced it to the point in the
code just before the line following the nested function is to be called, or
conversely right after the last line of the nested function.
What might be my problem? I'm hoping someone can give me some guidance on
what sort of things to check. I can't even think where to start.
you've corrupted your stack somehow.
look for overflows in arrays on the stack and the like.
"deancoo" <s2*******@yaho o.ca> wrote in message
news:UhB2e.1347 78$gJ3.30063@cl grps13... Hello all,
I have a class member, which calls another member from the same class.
The problem I'm experiencing is that the nested function executes fine,
but causes a segmentation fault as it exits. I've traced it to the point
in the code just before the line following the nested function is to be
called, or conversely right after the last line of the nested function.
What might be my problem? I'm hoping someone can give me some guidance on
what sort of things to check. I can't even think where to start.
d
Found the problem, the function was previously defined to return something,
later I changed that to void by removing the 'return' statement only (dumb
me). Anyway, that's what happens when a function that's defined to return
something doesn't.
Thanks for your comments,
d
"deancoo" <s2*******@yaho o.ca> wrote in message
news:SyB2e.1347 83$gJ3.116805@c lgrps13...
"deancoo" <s2*******@yaho o.ca> wrote in message
news:UhB2e.1347 78$gJ3.30063@cl grps13... Hello all,
I have a class member, which calls another member from the same class.
The problem I'm experiencing is that the nested function executes fine,
but causes a segmentation fault as it exits. I've traced it to the point
in the code just before the line following the nested function is to be
called, or conversely right after the last line of the nested function.
What might be my problem? I'm hoping someone can give me some guidance
on what sort of things to check. I can't even think where to start.
d
Found the problem, the function was previously defined to return
something, later I changed that to void by removing the 'return' statement
only (dumb me). Anyway, that's what happens when a function that's
defined to return something doesn't.
Thanks for your comments,
d
You removed the return statement, but the function still specified a return
type? That shouldn't even compile! I'd get a new compiler if it does.
-Howard
"deancoo" <s2*******@yaho o.ca> wrote in
news:UhB2e.1347 78$gJ3.30063@cl grps13: Hello all,
I have a class member, which calls another member from the same class.
The problem I'm experiencing is that the nested function executes
fine, but causes a segmentation fault as it exits. I've traced it to
the point in the code just before the line following the nested
function is to be called, or conversely right after the last line of
the nested function.
What might be my problem? I'm hoping someone can give me some
guidance on what sort of things to check. I can't even think where to
start.
[Note: platform specific answer, but hopefully generic enough....]
A couple of possibilities:
1) You've probably overrun one of your local variables, causing some
portion of your call stack to be stomped on. When your function attempts
to return to the calling site, the return address is scrambled. Check all
accesses to your local variables via a pointer. Also check if you have any
arrays as local variables and ensure that you haven't accessed beyond the
bounds of your array. That sort of thing.
2) A destructor of a local variable is going bad, and causing a segfault.
3) Something during the construction of the return value of your function
may be causing a segfault.
deancoo wrote: [...]
Found the problem, the function was previously defined to return something,
later I changed that to void by removing the 'return' statement only (dumb
me). Anyway, that's what happens when a function that's defined to return
something doesn't.
It's called "undefined behaviour", and you got a very good example of it.
Unfortunately, you can't easily say that when the function returns with
a bang, it's because it falls off its end when defined to return some
object. FWIW, you could get nothing special -- it's allowed just like
anything else.
V
Howard wrote: [...]
You removed the return statement, but the function still specified a return
type? That shouldn't even compile! I'd get a new compiler if it does.
Why shouldn't it compile? Which part of the Standard says that a program
that has such function is ill-formed? While you're looking for it, check
out 6.6.3/2, the last sentence.
V
"Howard" <al*****@hotmai l.com> wrote in message
news:1C******** **********@bgtn sc04-news.ops.worldn et.att.net...
"deancoo" <s2*******@yaho o.ca> wrote in message
news:SyB2e.1347 83$gJ3.116805@c lgrps13...
"deancoo" <s2*******@yaho o.ca> wrote in message
news:UhB2e.1347 78$gJ3.30063@cl grps13... Hello all,
I have a class member, which calls another member from the same class.
The problem I'm experiencing is that the nested function executes fine,
but causes a segmentation fault as it exits. I've traced it to the
point in the code just before the line following the nested function is
to be called, or conversely right after the last line of the nested
function.
What might be my problem? I'm hoping someone can give me some guidance
on what sort of things to check. I can't even think where to start.
d
Found the problem, the function was previously defined to return
something, later I changed that to void by removing the 'return'
statement only (dumb me). Anyway, that's what happens when a function
that's defined to return something doesn't.
Thanks for your comments,
d
You removed the return statement, but the function still specified a
return type? That shouldn't even compile! I'd get a new compiler if it
does.
-Howard
gcc 3.4.3
"Victor Bazarov" <v.********@com Acast.net> wrote in message
news:CF******** **********@news read1.mlpsca01. us.to.verio.net ... Howard wrote: [...]
You removed the return statement, but the function still specified a
return type? That shouldn't even compile! I'd get a new compiler if it
does.
Why shouldn't it compile? Which part of the Standard says that a program
that has such function is ill-formed? While you're looking for it, check
out 6.6.3/2, the last sentence.
V
I don't have a copy of the Standard, but Stroustrup's book "The C++
Programming Language", in section 7.3, states: "A value must be returned
from a function that is not declared void". Obviously, stating that
something is required doesn't neccessarily mean that the standard dictates
that a program that does not meet such a requirement is ill-formed, but
surely in this case it is...? My compiler(s) certainly won't let it
compile, and I can't see any reason why any compiler _would_ allow it.
-Howard This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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