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Herbert
Joined: 20 Jul 2008
Posts: 32
Location: Brisbane, Australia
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| Missing address for a goto in the C/ASM Listing |
 Posted: Fri Dec 26, 2008 9:07 pm |
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Does anybody have any thoughts on the following observations, please. Compiler is PCWH V4.079, developing for a 18F2620.
After a successful compile the C/ASM listing shows the following (with a lot of gumpf taken out)
| Code: |
1034: GOTO 1058
.................... case AAA : Switch_to_AA();
1038: CALL 0264
.................... break;
103C: MOVLB 3
103E: BRA 1054
.................... case BBB : Switch_to_BB();
1040: BRA 0FE6
.................... break;
1042: MOVLB 3
1044: BRA 1054
.................... case CC : Switch_to_CCC();
1046: BRA 0FFC
.................... break;
1048: MOVLB 3
104A: BRA 1054
.................... case External_Port : Switch_to_External();
104C: BRA 1012
.................... break;
104E: MOVLB 3
1050: BRA 1054
1052: MOVLB 3
.................... }
.................... }
1054: MOVLB 0
1056: RETLW 00
....................
.................... {
.................... int8 DDD[6];
....................
.................... If ( GGG < HHH)
*
1084: MOVF 53,W
1086: SUBLW 09
1088: BNC 10D2
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The GoTo refers to an address 1058, which does not exist in the listing. The addresses jump from 1056 to 1084, with nothing in between. A search of the C/ASM listing only shows a reference to it in the goto.
Also notice that addresses in the rest of the listing are not always sequential. Blocks of addresses can be in totally different positions, is this normal?
Trying to chase a problem where the position of a bit of code determines how other bits of code execute. I expect its a pointer problem, but seeing a listing with missing addresses is a bit of a concern. |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Fri Dec 26, 2008 11:30 pm |
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To see all the CCS library code, comment out the #nolist statement near
the start of the 18F2620.h file. Example:
| Quote: | //////// Standard Header file for the PIC18F2620 device ///
#device PIC18F2620
// #nolist |
Then re-compile and look at the .LST file again. |
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andrewg
Joined: 17 Aug 2005
Posts: 316
Location: Perth, Western Australia
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| Re: Missing address for a goto in the C/ASM Listing |
| Posted: Sat Dec 27, 2008 12:02 am |
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| Herbert wrote: | | Also notice that addresses in the rest of the listing are not always sequential. Blocks of addresses can be in totally different positions, is this normal? |
Yes. The compiler will reorder code to achieve a more optimal arrangement.
_________________
Andrew |
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Herbert
Joined: 20 Jul 2008
Posts: 32
Location: Brisbane, Australia
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| Posted: Sun Dec 28, 2008 7:09 pm |
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| Thanks very much PCM and Andrewg. Feel better now! It starts to make more sense. |
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