stringstream overwriting memory

ineya · 10-13-2009, 12:37 PM

I'm looking at a very strange problem in my work.
I'm working on a application, which runs on mips embedded device - this is making things difficult, because my favorite - 'valgrind' is not available here, and also electric fence has troubles to run.

I have:

static std::string s = "blahblah";

and

int SomeClass::someMethod()
{
stringstream h;
h << "Test";
}

and somehow the string 's' gets overwritten after calling stringstream:

perator<<.

I suspect something bad has happened to stringstream or some allocator, which it is using prior to using operator<<. But I'm now struggling how to detect what is the cause.

Can you recommend any approach or give any advice how to track this down?

Mara · 10-13-2009, 03:22 PM

But which 's' is overwritten? std::string or stringstream?

ineya · 10-14-2009, 12:41 AM

my bad, I didn't notice, that I used the same identified for both,
string 's' gets overwritten

Code:

static std::string s = "blahblah";

int SomeClass::someMethod()
{
  stringstream h;
  h << "Test"; // after this line the string s is overwritten or cut by few characters
}

smeezekitty · 10-14-2009, 12:54 AM

this related?:http://www.gamedev.net/community/for...opic_id=338873

lutusp · 10-14-2009, 01:44 AM

Quote:

Originally Posted by ineya

I'm looking at a very strange problem in my work.
I'm working on a application, which runs on mips embedded device - this is making things difficult, because my favorite - 'valgrind' is not available here, and also electric fence has troubles to run.

I have:

static std::string s = "blahblah";

and

int SomeClass::someMethod()
{
stringstream s;
s << "Test";
}

and somehow the string 's' gets overwritten after calling stringstream:

perator<<.

I suspect something bad has happened to stringstream or some allocator, which it is using prior to using operator<<. But I'm now struggling how to detect what is the cause.

Can you recommend any approach or give any advice how to track this down?

You have two entities labeled 's' -- a string and a stringstream. Which one is being overwritten? You don't say. And you don't make their respective namespaces clear -- is the static string 's' a member of the class "SomeClass" or something else? Also, what Java version is in use?

To put this simply, if you think you're confused, consider how we feel -- we have much less reliable information than you do.

ineya · 10-14-2009, 12:43 PM

Problem was bug in toolchain,.. I found that by huge luck, not sure how would I get there just by debugging.