Re: [Tinycc-devel] Large files causes infinite loop on mac
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 220 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: /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 1 100
$ 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 400 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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Re: [Tinycc-devel] Large files causes infinite loop on mac
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 220 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: /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. ___ Tinycc-devel mailing list Tinycc-devel@nongnu.org https://lists.nongnu.org/mailman/listinfo/tinycc-devel
[Tinycc-devel] Large files causes infinite loop on mac
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 220 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: /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
import sys, math, random
if len(sys.argv) != 3:
print("Error: example usage lineAmount fileAmount", file=sys.stderr)
exit(0)
random.seed(32384)
lineAmount=int(sys.argv[1])
fileAmount=int(sys.argv[2])
nextOpenIndex=0
nextFunctionIndex=0
fileIndex=0
file=0
functionNumbers=[]
functionStartIndex=0
for i in range(0, lineAmount):
if i == nextOpenIndex:
if fileIndex != 0:
file.close()
file=open(f"file{fileIndex}.c", "wt")
fileIndex += 1
nextOpenIndex = math.ceil((fileIndex/fileAmount)*lineAmount)
if i == nextFunctionIndex:
functionStartIndex = i
file.write(f"int test{i}() {{\n")
nextFunctionIndex = min(nextFunctionIndex +
math.floor(random.random()*1600)+500, nextOpenIndex)
file.write(f"\tstatic int array[{nextFunctionIndex}];\n")
functionNumbers.append(i)
file.write(f"\tarray[{i-functionStartIndex}] = {i*3};\n")
if i == nextFunctionIndex-1:
r = math.floor(random.random()*nextFunctionIndex)
file.write(f"\treturn array[{r}];\n")
file.write(f"}}\n")
for i in functionNumbers:
file.write(f"int test{i}();\n")
file.write("int main() {\n")
for i in functionNumbers:
file.write(f"\ttest{i}();\n")
file.write("}\n")
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