[Tinycc-devel] Stack Exhaustion on commit 5201312cb242ea943848fcf864adacc44d3d190f

[Zhuo Zhang]

With TinyCC commit 5201312cb242ea943848fcf864adacc44d3d190f, there is a stack 
exhaustion bug. 

Btw, for my previous bug, I think it can be fixed by adding one more check at 
lines 8446 in tccgen.c. 

$ cat test.c
int main() {
  {
    struct {
      struct {};
    } a();
  }
  a();
}

$ ./tcc -c -o tcc.o test.c 
==8431==ERROR: AddressSanitizer: stack-overflow on address 0x7ffdb1afaff8 (pc 
0x000000616a88 bp 0x7ffdb1afb010 sp 0x7ffdb1afb000 T0)
    #0 0x616a87  (/root/git/tinycc/tcc+0x616a87)
    #1 0x616d08  (/root/git/tinycc/tcc+0x616d08)
    #2 0x616d08  (/root/git/tinycc/tcc+0x616d08)
    #3 0x616d08  (/root/git/tinycc/tcc+0x616d08)
    #4 0x616d08  (/root/git/tinycc/tcc+0x616d08)
    #5 0x616d08  (/root/git/tinycc/tcc+0x616d08)
    #6 0x616d08  (/root/git/tinycc/tcc+0x616d08)
    #7 0x616d08  (/root/git/tinycc/tcc+0x616d08)
    #8 0x616d08  (/root/git/tinycc/tcc+0x616d08)
    #9 0x616d08  (/root/git/tinycc/tcc+0x616d08)
    #10 0x616d08  (/root/git/tinycc/tcc+0x616d08)
    #11 0x616d08  (/root/git/tinycc/tcc+0x616d08)
    #12 0x616d08  (/root/git/tinycc/tcc+0x616d08)
    #13 0x616d08  (/root/git/tinycc/tcc+0x616d08)
    …...
    #249 0x616d08  (/root/git/tinycc/tcc+0x616d08)

SUMMARY: AddressSanitizer: stack-overflow (/root/git/tinycc/tcc+0x616a87)
==8431==ABORTING