Date: Tue, 15 Jul 2014 17:11:15 +0400 From: "Ivan A. Kosarev" <ivan@ivan-labs.com> To: freebsd-current@freebsd.org Subject: Demangling issues with libcxxrt.so.1 on v9.2 Message-ID: <53C52873.5050309@ivan-labs.com>
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Hello everybody,
It seems there are problems with demandling some kinds of names with
libcxxrt.so.1 on FreeBSD 9.2 (I didn't test other versions yet).
This program:
---
#include <stdio.h>
#include <stdlib.h>
extern "C" char* __cxa_demangle(const char* mangled_name,
char* buf, size_t* n, int* status);
void test(const char *mangled) {
int status = 0;
char *DemangledName = __cxa_demangle(mangled, NULL, NULL, &status);
printf("%s: status %d", mangled, status);
if(status == 0)
printf("; demangled: '%s'", DemangledName);
free(DemangledName);
printf("\n");
}
int main(void) {
test("_Z9NullDerefPi");
test("_ZL9NullDerefPi");
test("_ZN8DeepFreeILi0EE4freeEPc");
test("_ZN8DeepFreeILi13EE4freeEPc");
test("_ZN8DeepFreeILi36EE4freeEPc");
return 0;
}
---
outputs:
---
_Z9NullDerefPi: status 0; demangled: 'NullDeref(int*)'
_ZL9NullDerefPi: status -2
_ZN8DeepFreeILi0EE4freeEPc: status 0; demangled: 'DeepFree<0E>::free(char*)'
_ZN8DeepFreeILi13EE4freeEPc: status 0; demangled:
'DeepFree<13E>::free(char*)'
_ZN8DeepFreeILi36EE4freeEPc: status 0; demangled:
'DeepFree<36E>::free(char*)'
---
Note that it fails to demangle the local name in the 2nd line and adds
extra 'E' character in DeepFree<...E>s.
The case with the local name is not critical, but the case with
DeepFree<...E> prevents LLVM's address sanitizer tests from passing on
FreeBSD so the question is: is there a chance the defect will be
resolved any time soon or should I try to prepare a fix to speed up the
process?
Thanks a lot.
--
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