Hello!
I am writing to report a potential bug I encountered when playing with the
GIMPLE IR. I enabled the ASan and would like to print out all ASAN_MARK
statements for the following simple code:
int main(int argc ,char **argv)
{
int stack_array[100];
stack_array[1] = 100;
stack_array[argc + 12]; // an ASan check, namely, ASAN_MARK, will
be inserted at this point
}
And I am using the following code snippet (basically derived from this
post
<https://stackoverflow.com/questions/29346772/print-called-function-name-using-gcc-plugin>)
to print out all function calls, including ASAN_MARK:
if (is_gimple_call(stmt)){
tree current_fn_decl = gimple_call_fndecl(stmt);
const char* name = get_name(current_fn_decl);
cerr << " Function : " << name << " is called \n";
}
However, I note that some internal exceptions are encountered, when I
use gcc version 7.4, 8.3, and also 9.3:
test.c: In function ‘main’:
test.c:9:5: internal compiler error: Segmentation fault
9 | int main(int argc ,char **argv)
| ^~~~
0xab88bf crash_signal
../../gcc-9.3.0/gcc/toplev.c:326
0xcfc836 location_wrapper_p(tree_node const*)
../../gcc-9.3.0/gcc/tree.h:3812
0xcfc836 tree_nop_conversion
../../gcc-9.3.0/gcc/tree.c:12850
0xcfc836 tree_strip_nop_conversions(tree_node*)
../../gcc-9.3.0/gcc/tree.c:12888
0xcfc836 get_name(tree_node*)
../../gcc-9.3.0/gcc/tree.c:12559
0x7f9466d86bb7 execute
/home/shuaiw/work/sanitizer_reduction_gcc/demo/walk_gimple/walk_gimple.cc:61
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
Makefile:10: recipe for target 'test' failed
make: *** [test] Error 1
I think the issue is due to ASAN_MARK, because when I comment out that
particular array access which induces the ASAN_MARK, all other function
calls, including ASan related functions, __builtin___asan_init
and __builtin___asan_version_mismatch_check_v8, and be smoothly printed out
with no issue.
Can I interpret it as a bug or somewhat? Any suggestions are welcomed.
Thank you very much.
Best,
Shuai
