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Eclipse indexing wrongly [message #1022322]

Thu, 21 March 2013 17:11

David W

Messages: 16
Registered: March 2013

Junior Member

Hi

I posted this under different category eariler.

I've found a problem and I think it might be an eclipse bug.

I am on redhat 5 x64 running juno. The following code prints out checkpoint2. However, eclipse grayed out checkpoint1 and checkpoint2 . Appraently, eclipse uses a different ULONG_MAX value as from the gcc compiler. Is this a bug from eclipse?

#include <stdio.h>
#include <limits.h>

int main()
{
printf("%llu\n", (unsigned long long) ULONG_MAX);
/* prints 18446744073709551615 and checkpoint2 */

#if (ULONG_MAX >> 31) == 1 <---- grayed out
printf("checkpoint1\n");
#elif (ULONG_MAX >> 63) == 1 <---- grayed out
printf("checkpoint2\n");
#else
printf("checkpoint3\n");
#endif

return 0;
}

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Re: Eclipse indexing wrongly [message #1022474 is a reply to message #1022322]

Fri, 22 March 2013 00:06

David W

Messages: 16
Registered: March 2013

Junior Member

Can someone confirm? I am not sure if I am doing something stupid...

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Re: Eclipse indexing wrongly [message #1022718 is a reply to message #1022322]

Fri, 22 March 2013 12:16

Axel Mueller

Messages: 1973
Registered: July 2009

Senior Member

According to the MSDN help page http://msdn.microsoft.com/en-us/library/ew2hz0yd.aspx
"The translation represents type int the same as type long"

This code here will work (I tried it with gcc and Eclipse on Windows)

#if (UINT_MAX >> 31 == 1)
  dfd
#endif

Before you ask
- search this forum
- see the FAQ http://wiki.eclipse.org/CDT/User/FAQ
- google

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Re: Eclipse indexing wrongly [message #1022837 is a reply to message #1022322]

Fri, 22 March 2013 16:05

Klaus km

Messages: 142
Registered: November 2011

Senior Member

Hello David,

you probably know that Eclipse and CDT are written in Java?
The biggest integer Data Type in Java is long, which is a 64 Bit SIGNED type. This is the reason, why the Editor grayed out the 'if' wrongly, because CDT internally is using "long".

Try out this example, it's using the biggest number, which CDT (and Java) could save in a primitive Data Type "long". In this example checkpoint2 is not grayed out:

#include <stdio.h>
#include <limits.h>

#define TEST_MAX 0x7fffffffffffffffUL

int main() {
printf("%llu\n", (unsigned long long) TEST_MAX);

#if TEST_MAX == 0xffffffffUL +1
printf("checkpoint1\n");
#elif (TEST_MAX >> 62) == 1
printf("checkpoint2\n");
#else
printf("checkpoint3\n");
#endif

return 0;
}

Could you please check Bugzilla, maybe there is already a Bug-Entry about this problem, but if not please add a new bug.

Bugzilla: https://bugs.eclipse.org/bugs/

Java-Data Types: http://docs.oracle.com/javase/tutorial/java/nutsandbolts/datatypes.html

regards,
Klaus

CDT User Guide
CDT User FAQ

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Re: Eclipse indexing wrongly [message #1022869 is a reply to message #1022837]

Fri, 22 March 2013 17:20

David W

Messages: 16
Registered: March 2013

Junior Member

Hi Klaus

Thanks. I don't see an existing bug so I created one last week, ID 403404.

I used your example and yes the checkpoint2 is NOT grayed out.

My case is not as simple as printing out "checkpoinsts". I actually have some typedef within each if condition. Wrongly grayed out means the typedef declaration within the if statement will NOT be known and so the indexing throughout the whole program fails.

Is there a quick fix that we can do to avoid this situation?

Thanks

David

[Updated on: Fri, 22 March 2013 17:21]

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Re: Eclipse indexing wrongly [message #1022880 is a reply to message #1022869]

Fri, 22 March 2013 17:59

Klaus km

Messages: 142
Registered: November 2011

Senior Member

Quote:

Is there a quick fix that we can do to avoid this situation?

Not that I know of.

If you have a central header you could add your own define (for 32Bit/64Bit) and then use this new define in your code - but you must change your source...

regards,
Klaus

CDT User Guide
CDT User FAQ

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