I have encountered an internal compiler error when compiling a particular bit of code for the 8051 (mcs51) using the large memory model and a re-entrant function.
If the small memory model is used or if the function is made
non-reentrant, then it compiles successfully (although the generated
code is incorrect! I will post separately about the code generation
error).
However, this particular re-entrant function has no local variables,
parameters, or return value. I think that SDCC is, however, creating a
temporary stack variable for the value of the "(now - updated)"
expression, and perhaps it is confused since SDCC thought it was not
going to require storage for any local variables.
Compiler Error
==============
$ ~/bin/sdcc/bin/sdcc -mmcs51 -c --model-small bad.c
$ ~/bin/sdcc/bin/sdcc -mmcs51 -c --model-large bad.c
bad.c:16: error 9: FATAL Compiler Internal Error in file 'gen.c' line
number '441' : getFreePtr should never reach here
Contact Author with source code
SDCC version
============
I am using SDCC svn revision 5287, though I also tested rev 5252, which
also exhibits the same error.
$ ~/bin/sdcc/bin/sdcc --version SDCC : mcs51 2.8.4 #5287 (Dec 16 2008)
(UNIX)
Source Code (bad.c)
===================
------------------------------------------------------------
#include <stdint.h>
uint32_t sleep_timer_get(void);
int32_t remaining;
uint32_t updated;
uint32_t now;
static void do_test(void) __reentrant
{
while (1)
{
now = sleep_timer_get();
remaining -= (now - updated) & 0xFF;
updated = now;
}
}
------------------------------------------------------------
Regards,
Colin
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