On 12/27/22 07:58, Herman ten Brugge wrote:
On 12/27/22 05:45, Levo D wrote:
I'm messing around with tcc. I don't need this to be fixed, I just
thought someone may want the report. I'm trying to figure out how
fast the tcc backend is for my compiler.
I seem to hit an infinite loop on mac osx venture. I built tcc
earlier this month (Dec 2022). I suspect it's an overflow bug. Here's
how to reproduce, on linux x86-64 it errors out at a smaller number.
Run the following python script (I copied it below)
https://bolinlang.com/genc.py
python3 ./genc.py 2200000 4
Create object files then try to link. It'll loop forever
tcc -c *.c
tcc *.o
You can try building it straight which will build but won't execute
$ tcc *.c
$ ./a.out
dyld[4330]: dyld cache '(null)' not loaded: syscall to map cache into
shared region failed
dyld[4330]: Library not loaded: /usr/lib/libSystem.B.dylib
Referenced from: <no uuid> /private/tmp/t/test/a.out
Reason: tried: '/usr/lib/libSystem.B.dylib' (no such file),
'/System/Volumes/Preboot/Cryptexes/OS/usr/lib/libSystem.B.dylib' (no
such file), '/usr/lib/libSystem.B.dylib' (no such file, no dyld
cache), '/usr/local/lib/libSystem.B.dylib' (no such file)
Abort trap: 6
Using a smaller number everything works fine. I'll repeat that I'm
just playing around and don't need this to work. Here's a copy paste
of the python script
I fixed the forever loop.
The code now compiles but does not run. I get:
dyld[74088]: dyld cache
'/System/Library/dyld/dyld_shared_cache_arm64e' not loaded: syscall to
map cache into shared region failed
dyld[74088]: Library not loaded: '/usr/lib/libSystem.B.dylib'
Referenced from: '/Users/hermantb/tinycc/tst/a.out'
Reason: tried: '/usr/lib/libSystem.B.dylib' (no such file),
'/usr/local/lib/libSystem.B.dylib' (no such file)
Abort trap: 6
Probably because the bss section is larger then 4G.
I also tried to compile you code with gcc/clang on fedora(x86_64) and
also get overflow reports when compiling.
So probably there is a limit some where. I did not check.
So if gcc/clang cannot compile the code tcc can fail as well.
I updated the python script. I can now run:
$ python3 ./genc.py 100000000 100
$ tcc -bench -c *.c
* 78156 idents, 1157015 lines, 28090333 bytes
* 91.295 s, 12673 lines/s, 0.3 MB/s
* text 11784304, data.rw 0, data.ro 0, bss 4000000 bytes
$ tcc -bench *.o
* 0 idents, 0 lines, 1 bytes
* 3.383 s, 0 lines/s, 0.0 MB/s
* text 0, data.rw 0, data.ro 0, bss 0 bytes
updated lines in script:
29c29
< file.write(f"\tstatic int array[{nextFunctionIndex}];\n")
---
> file.write(f"\tstatic int
array[{nextFunctionIndex-functionStartIndex}];\n")
33c33
< r = math.floor(random.random()*nextFunctionIndex)
---
> r =
math.floor(random.random()*(nextFunctionIndex-functionStartIndex))
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