[Tinyos-8051wg] Re: [Tinyos-2.0wg] Bug in nesC 1.2alpha10

[Cory Sharp]

Just for the record... A reasonable alternative is to define generic
components of the form MyComponent(max_clients) instead of
MyComponent(special_string).  In practice, instantiation of those
components looks like

    new MyComponent(uniqueCount(special_string))

instead of

    new MyComponent(special_string)

This is what the timer system does for VirtualizeTimerC and it works
fine.  I even assert this should be the standard practice since the
max_clients form seems more general.  The special_string form doesn't
provide any additional abstraction for the use-cases I've heard so
far.

Cory

On 5/20/05, Joe Polastre <joe.polastre at gmail.com> wrote:
> I believe there is a bug in the new nesC with passing strings into a component.
> 
> I think that if you pass in a string and the string is used in
> "uniqueCount", nesC is evaluating uniqueCount at the time that file is
> processed rather than waiting until the full program is processed and
> then assigning uniqueCount values.
> 
> To see the bug, compile apps/TestSPI for telosb.  You will get the
> "comparison is always false due to limited range of data type" even
> though the uniqueCount value should equal 2!
> 
> -Joe
> 
> $ make telosb
> mkdir -p build/telosb
>     compiling TestSPIC to a telosb binary
> ncc -o build/telosb/main.exe -Os -O -mdisable-hwmul
> -I/home/polastre/cvs/tinyos-2.x/tos/lib/CC2420Radio
> -I/home/polastre/cvs/tinyos-2.x/tos/../beta/STM25P/STM25P -Wall
> -Wshadow -DDEF_TOS_AM_GROUP=0x7d -Wnesc-all -target=telosb
> -fnesc-cfile=build/telosb/app.c -board=  TestSPIC.nc -lm
> nesc1: warning: calls to SoftwareInit.init in RealMain are uncombined
> C:/PROGRA~1/UCB/cygwin/home/polastre/cvs/tinyos-2.x/tos/interfaces/BusArbitration.nc:
> In function `BusArbitrationM$0$busReleased$runTask':
> C:/PROGRA~1/UCB/cygwin/home/polastre/cvs/tinyos-2.x/tos/interfaces/BusArbitration.nc:49:
> warning: comparison is always false due to limited range of data type
>     compiled TestSPIC to build/telosb/main.exe
>             3320 bytes in ROM
>               52 bytes in RAM
> msp430-objcopy --output-target=ihex build/telosb/main.exe build/telosb/main.ihex
>     writing TOS image
> 
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