[sdcc-devel] [ sdcc-Bugs-1957716 ] Absolute memory overlap detection by SDCC

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Bugs item #1957716, was opened at 2008-05-05 07:40
Message generated for change (Comment added) made by maartenbrock
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Category: assembler
>Group: fixed
>Status: Closed
>Resolution: Fixed
Priority: 5
Private: No
Submitted By: BLRCalvin (blrcalvin)
Assigned to: Maarten Brock (maartenbrock)
Summary: Absolute memory overlap detection by SDCC

Initial Comment:
Hello, 
 
I am using SDCC 2.8.0 #5117 (Mar 23 2008) for MCS51 port. 
 
In the usermanual under sec 3.5, Absolute addressing, it is mentioned that the linker will detect the overlaps if variables are provided with initializers. I expect the linker to throw an error for the following piece of code but it is not giving any error. 
 
volatile __code __at (0x2000) char dummy = 'a'; 
 
volatile __code __at (0x2000) char dummy1 = 'b'; 
 
int main() 
{ 
 
if( dummy == dummy1 ) return 1; 
 
return 0; 
 
} 
 
compiler options: sdcc -mmcs51 example.c 
 
Expected behaviour: Linker should throw error while trying to allocate variables dummy and dummy1 at the same address 0x2000.

Current behaviour: No error. 
Currently, the code generated in .rst file is as follows:

                150 	.area CSEG    (CODE)
                151 	.area CONST   (CODE)
                152 	.area XINIT   (CODE)
                153 	.area CABS    (ABS,CODE)
   2000         154 	.org 0x2000
   2000         155 _dummy:
   2000 61      156 	.db #0x61
   2000         157 	.org 0x2000
   2000         158 _dummy1:
   2000 62      159 	.db #0x62

 
Regards, 
Raghu. 

----------------------------------------------------------------------

>Comment By: Maarten Brock (maartenbrock)
Date: 2008-05-08 00:27

Message:
Logged In: YES 
user_id=888171
Originator: NO

Fixed in SDCC 2.8.1 #5154.

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