When I make this call

format(" %3.3f"w, avgFPS);

my program immediately crashes with an access violation error. The debugger out is different between x86 and x86-64.

I've made all sanity checks, so I need some other suggestions.

On Saturday, 16 October 2021 at 22:47:09 UTC, solidstate1991 wrote:

format(" %3.3f"w, avgFPS);

I think it would be helpful to know what type avgFPS is and what you do with the output of format(). Access violation is mostly an access to a null pointer.

On Saturday, 16 October 2021 at 22:47:09 UTC, solidstate1991 wrote:

format(" %3.3f"w, avgFPS);

what is the type of avgFPS?

On Sunday, 17 October 2021 at 05:22:17 UTC, russhy wrote:

format(" %3.3f"w, avgFPS);

I's a double, but I've tried to pass it as real and float too, with the same exact error being generated.

On Sunday, 17 October 2021 at 12:53:07 UTC, solidstate1991 wrote:

format(" %3.3f"w, avgFPS);

then it's likely that some memory corruption prior to format() has broken the GC, and format's allocation of a string is what's failing. Try sprinkling @safe and and see what it complains about; try valgrind; try reducing your problem. I don't think we can help you more without a way to replicate the fault.

On Sunday, 17 October 2021 at 13:03:46 UTC, jfondren wrote:

I ran Valgrind, and I've noticed some possible leakage in a library I've written, but I'll check for it further once I'll have a bit more time.

On 10/16/21 6:47 PM, solidstate1991 wrote:

format(" %3.3f"w, avgFPS);

FYI, solidstate figured this out. It was because of an out-of-bounds index on BitArray.

But that irks me. Why wouldn't BitArray do a bounds check? And then I remembered -- Phobos is built in release mode even when your app is not.

I literally cannot request from the compiler that BitArray enforce its contracts without rebuilding the library completely. I never want to build code that doesn't have bounds checks.

How can we fix this?

-Steve

On Sunday, 17 October 2021 at 21:00:19 UTC, Steven Schveighoffer wrote:

format(" %3.3f"w, avgFPS);

contracts ?

bound checks should be in the body and conditionally compiled with version(D_NoBoundsChecks){} else {}

then same problem because it's not a function template I guess.
someone should make it a function template then.

On 10/18/21 8:35 AM, user1234 wrote:

format(" %3.3f"w, avgFPS);

Even a template may not help, if the compiler decides it's already been instantiated.

-Steve