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I have just received a report from a user that NQC programs containing
subroutines do not execute correctly against the Spybot platform. I have
confirmed that this is a problem with all versions of NQC which support the
Spybot brick.
This program:
#define SpyReturn asm { 0xF6 }
sub test()
{
// int i = 15;
PlayTone(400, 50);
// if (i < 30) SpyReturn;
Wait(50);
// SpyReturn;
}
sub test2()
{
PlayTone(800, 50);
Wait(50);
// SpyReturn;
}
sub test3()
{
PlayTone(1000, 50);
Wait(50);
// SpyReturn;
}
task main()
{
PlaySound(SOUND_FAST_UP);
Wait(100);
test();
PlaySound(SOUND_DOUBLE_BEEP);
}
generates essentially identical code for both the RCX2 and Spybot targets (the
only difference being subroutine & task numbers:
*** Task 8 = main
000 pwr ABC, 7 13 07 02 07
004 dir ABC, Fwd e1 87
006 plays 5 51 05
008 wait 100 43 02 64 00
012 calls 128 17 00
014 plays 1 51 01
*** Sub 128 = test
000 playt 400, 50 23 90 01 32
004 wait 50 43 02 32 00
*** Sub 129 = test2
000 playt 800, 50 23 20 03 32
004 wait 50 43 02 32 00
*** Sub 130 = test3
000 playt 1000, 50 23 e8 03 32
004 wait 50 43 02 32 00
Total size: 40 bytes
On the RCX2 platform this code executes correctly. On the Spybot platform it
does not. After executing the code in the first subroutine (128) instead of
returning to the code in task 8 (main) the code in all subsequent subroutines
will execute in order before finally returning to the line in task 8 following
the call statement.
Until I can release a new beta of NQC 3.0 the workaround is to define a macro
#define SpyReturn asm { 0xF6 }
use SpyReturn instead of return, and make sure you end all your subroutines with
SpyReturn;
John Hansen
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