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another bug description

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git-svn-id: svn+q:///qpdf/trunk@974 71b93d88-0707-0410-a8cf-f5a4172ac649
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Jay Berkenbilt 2010-06-06 12:34:27 +00:00
parent 7559934b02
commit 909d1d5602
1 changed files with 44 additions and 0 deletions
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Bug
===
* There is a memory leak that happens whenever object A refers to
object B which refers back to object A. We have the following
pattern:
#include "PointerHolder.hh"
class A
{
public:
PointerHolder<A> a;
};
int main()
{
A a1;
a1.a = new A();
a1.a.getPointer()->a = new A();
a1.a.getPointer()->a.getPointer()->a = a1.a;
return 0;
}
In order to fix this, we have to explicitly break circular
references, but we have to do this at a time that doesn't
completely destroy performance.
To debug, configure with
./configure --disable-shared --disable-test-compare-images \
CFLAGS=-g CXXFLAGS=-g
Current code causes test failures. linearize segfaults on
hybrid-xref.pdf, and the test suite fails in various places. Maybe
because we don't do any kind of loop detection?
Use valgrind --leak-check=full to see leak details.
The file memory-leak.pdf is a minimal case that shows the problem.
Files in trace having tracing to show which objects haven't been
allocated.
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====