[Tinycc-devel] Large files causes infinite loop on mac

[Levo D]

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

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")