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From: "zhan3299 at purdue dot edu" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/98972] New: internal compiler error: Segmentation fault
 signal terminated program cc1plus
Date: Fri, 05 Feb 2021 03:38:03 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98972

            Bug ID: 98972
           Summary: internal compiler error: Segmentation fault signal
                    terminated program cc1plus
           Product: gcc
           Version: 10.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zhan3299 at purdue dot edu
  Target Milestone: ---

Hi,=20

I have a crafted .cc program named crash1.cc. When I use both gcc-10 and g+=
+-10
compile it, an internal compiler error occurs. I run it on Ubuntu 20.04 x64.

Details are attached.


--- crash1.cc starts ----
constexpr const short f() { return 1.2345 * 0 / 01e9; try {  enum s {  }  a=
[] =3D
{ 0 };; __attribute__ ((noinline(2))); a || -1ULL; } catch (int x) { int a[=
] =3D
{ 0 }; struct s {  }; struct t: s {} ; try { (x %=3D 0); (x =3D=3D 0); l:; =
} catch
(int x) { auto x =3D f();  struct s {}; struct l: s {} t; 0 - 0; 0 + 0; } [=
] (
union s {} ) {};f; (sizeof(x) =3D=3D __builtin_popcount(x)); if (sizeof ((v=
oid)
sizeof(char[1 - 2 * x]))) { register const ; extern void; ; asm("" : "=3Da"=
(x),
"=3Dd"(x) : "r" (x), "0" (x), "1" (x));  void; } else { for (unsigned int i=
 =3D
f(); i < .1; i++) { for (unsigned int i =3D (x =3D=3D 0); i < &&l; i++) { ;
__builtin_inf(); __builtin_alloca(1); alignof(x); ;  class s {  } ; asm
volatile ("" :  :  : ); ; }; int a[] =3D {};; x; ;  class s {  } ; const ; =
x; ~-1
- 0; }; 0 << 0 >> 0; &f; s; __builtin_constant_p(2); ;;  struct s restrict ;
struct t: s {} ; }; }  class &&l {  } ;; } void T( int *x) { f(); }
--- crash1.cc ends ---


--- g++-10 version starts ---
root@c0d53067e55a:~/docker_share/gcc# g++-10 --version
g++-10 (Ubuntu 10.2.0-5ubuntu1~20.04) 10.2.0
Copyright (C) 2020 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

root@c0d53067e55a:~/docker_share/gcc# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 20.04.2 LTS
Release:        20.04
Codename:       focal
--- g++-10 version ends ---


--- g++-10 crash log starts ---
root@c0d53067e55a:~/docker_share/gcc# g++-10 crash1.cc
crash1.cc: In function 'constexpr const short int f()':
crash1.cc:1:55: warning: 'try' in 'constexpr' function only available with
'-std=3Dc++2a' or '-std=3Dgnu++2a'
    1 | constexpr const short f() { return 1.2345 * 0 / 01e9; try {  enum s=
 {=20
}  a[] =3D { 0 };; __attribute__ ((noinline(2))); a || -1ULL; } catch (int =
x) {
int a[] =3D { 0 }; struct s {  }; struct t: s {} ; try { (x %=3D 0); (x =3D=
=3D 0); l:;
} catch (int x) { auto x =3D f();  struct s {}; struct l: s {} t; 0 - 0; 0 =
+ 0; }
[] ( union s {} ) {};f; (sizeof(x) =3D=3D __builtin_popcount(x)); if (sizeof
((void) sizeof(char[1 - 2 * x]))) { register const ; extern void; ; asm("" :
"=3Da"(x), "=3Dd"(x) : "r" (x), "0" (x), "1" (x));  void; } else { for (uns=
igned
int i =3D f(); i < .1; i++) { for (unsigned int i =3D (x =3D=3D 0); i < &&l=
; i++) { ;
__builtin_inf(); __builtin_alloca(1); alignof(x); ;  class s {  } ; asm
volatile ("" :  :  : ); ; }; int a[] =3D {};; x; ;  class s {  } ; const ; =
x; ~-1
- 0; }; 0 << 0 >> 0; &f; s; __builtin_constant_p(2); ;;  struct s restrict ;
struct t: s {} ; }; }  class &&l {  } ;; } void T( int *x) { f(); }
      |                                                       ^~~
crash1.cc:1:83: error: invalid conversion from 'int' to 'f()::s' [-fpermiss=
ive]
    1 | constexpr const short f() { return 1.2345 * 0 / 01e9; try {  enum s=
 {=20
}  a[] =3D { 0 };; __attribute__ ((noinline(2))); a || -1ULL; } catch (int =
x) {
int a[] =3D { 0 }; struct s {  }; struct t: s {} ; try { (x %=3D 0); (x =3D=
=3D 0); l:;
} catch (int x) { auto x =3D f();  struct s {}; struct l: s {} t; 0 - 0; 0 =
+ 0; }
[] ( union s {} ) {};f; (sizeof(x) =3D=3D __builtin_popcount(x)); if (sizeof
((void) sizeof(char[1 - 2 * x]))) { register const ; extern void; ; asm("" :
"=3Da"(x), "=3Dd"(x) : "r" (x), "0" (x), "1" (x));  void; } else { for (uns=
igned
int i =3D f(); i < .1; i++) { for (unsigned int i =3D (x =3D=3D 0); i < &&l=
; i++) { ;
__builtin_inf(); __builtin_alloca(1); alignof(x); ;  class s {  } ; asm
volatile ("" :  :  : ); ; }; int a[] =3D {};; x; ;  class s {  } ; const ; =
x; ~-1
- 0; }; 0 << 0 >> 0; &f; s; __builtin_constant_p(2); ;;  struct s restrict ;
struct t: s {} ; }; }  class &&l {  } ;; } void T( int *x) { f(); }
      |=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
          ^
      |=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
          |
      |=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
          int
crash1.cc:1:89: warning: attributes at the beginning of statement are ignor=
ed
[-Wattributes]
    1 | constexpr const short f() { return 1.2345 * 0 / 01e9; try {  enum s=
 {=20
}  a[] =3D { 0 };; __attribute__ ((noinline(2))); a || -1ULL; } catch (int =
x) {
int a[] =3D { 0 }; struct s {  }; struct t: s {} ; try { (x %=3D 0); (x =3D=
=3D 0); l:;
} catch (int x) { auto x =3D f();  struct s {}; struct l: s {} t; 0 - 0; 0 =
+ 0; }
[] ( union s {} ) {};f; (sizeof(x) =3D=3D __builtin_popcount(x)); if (sizeof
((void) sizeof(char[1 - 2 * x]))) { register const ; extern void; ; asm("" :
"=3Da"(x), "=3Dd"(x) : "r" (x), "0" (x), "1" (x));  void; } else { for (uns=
igned
int i =3D f(); i < .1; i++) { for (unsigned int i =3D (x =3D=3D 0); i < &&l=
; i++) { ;
__builtin_inf(); __builtin_alloca(1); alignof(x); ;  class s {  } ; asm
volatile ("" :  :  : ); ; }; int a[] =3D {};; x; ;  class s {  } ; const ; =
x; ~-1
- 0; }; 0 << 0 >> 0; &f; s; __builtin_constant_p(2); ;;  struct s restrict ;
struct t: s {} ; }; }  class &&l {  } ;; } void T( int *x) { f(); }
      |=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
                ^~~~~~~~~~~~~
crash1.cc:1:199: warning: 'try' in 'constexpr' function only available with
'-std=3Dc++2a' or '-std=3Dgnu++2a'
    1 | constexpr const short f() { return 1.2345 * 0 / 01e9; try {  enum s=
 {=20
}  a[] =3D { 0 };; __attribute__ ((noinline(2))); a || -1ULL; } catch (int =
x) {
int a[] =3D { 0 }; struct s {  }; struct t: s {} ; try { (x %=3D 0); (x =3D=
=3D 0); l:;
} catch (int x) { auto x =3D f();  struct s {}; struct l: s {} t; 0 - 0; 0 =
+ 0; }
[] ( union s {} ) {};f; (sizeof(x) =3D=3D __builtin_popcount(x)); if (sizeof
((void) sizeof(char[1 - 2 * x]))) { register const ; extern void; ; asm("" :
"=3Da"(x), "=3Dd"(x) : "r" (x), "0" (x), "1" (x));  void; } else { for (uns=
igned
int i =3D f(); i < .1; i++) { for (unsigned int i =3D (x =3D=3D 0); i < &&l=
; i++) { ;
__builtin_inf(); __builtin_alloca(1); alignof(x); ;  class s {  } ; asm
volatile ("" :  :  : ); ; }; int a[] =3D {};; x; ;  class s {  } ; const ; =
x; ~-1
- 0; }; 0 << 0 >> 0; &f; s; __builtin_constant_p(2); ;;  struct s restrict ;
struct t: s {} ; }; }  class &&l {  } ;; } void T( int *x) { f(); }
      |=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20
                                              ^~~
crash1.cc:1:208: warning: division by zero [-Wdiv-by-zero]
    1 | constexpr const short f() { return 1.2345 * 0 / 01e9; try {  enum s=
 {=20
}  a[] =3D { 0 };; __attribute__ ((noinline(2))); a || -1ULL; } catch (int =
x) {
int a[] =3D { 0 }; struct s {  }; struct t: s {} ; try { (x %=3D 0); (x =3D=
=3D 0); l:;
} catch (int x) { auto x =3D f();  struct s {}; struct l: s {} t; 0 - 0; 0 =
+ 0; }
[] ( union s {} ) {};f; (sizeof(x) =3D=3D __builtin_popcount(x)); if (sizeof
((void) sizeof(char[1 - 2 * x]))) { register const ; extern void; ; asm("" :
"=3Da"(x), "=3Dd"(x) : "r" (x), "0" (x), "1" (x));  void; } else { for (uns=
igned
int i =3D f(); i < .1; i++) { for (unsigned int i =3D (x =3D=3D 0); i < &&l=
; i++) { ;
__builtin_inf(); __builtin_alloca(1); alignof(x); ;  class s {  } ; asm
volatile ("" :  :  : ); ; }; int a[] =3D {};; x; ;  class s {  } ; const ; =
x; ~-1
- 0; }; 0 << 0 >> 0; &f; s; __builtin_constant_p(2); ;;  struct s restrict ;
struct t: s {} ; }; }  class &&l {  } ;; } void T( int *x) { f(); }
      |=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20
                                                     ~~^~~~
crash1.cc:1:252: error: redeclaration of 'auto x' [-fpermissive]
    1 | n 1.2345 * 0 / 01e9; try {  enum s {  }  a[] =3D { 0 };; __attribut=
e__
((noinline(2))); a || -1ULL; } catch (int x) { int a[] =3D { 0 }; struct s =
{  };
struct t: s {} ; try { (x %=3D 0); (x =3D=3D 0); l:; } catch (int x) { auto=
 x =3D f();=20
struct s {}; struct l: s {} t; 0 - 0; 0 + 0; } [] ( union s {} ) {};f;
(sizeof(x) =3D=3D __builtin_popcount(x)); if (sizeof ((void) sizeof(char[1 =
- 2 *
x]))) { register const ; extern void; ; asm("" : "=3Da"(x), "=3Dd"(x) : "r"=
 (x),
"0" (x), "1" (x));  void; } else { for (unsigned int i =3D f(); i < .1; i++=
) {
for (unsigned int i =3D (x =3D=3D 0); i < &&l; i++) { ; __builtin_inf();
__builtin_alloca(1); alignof(x); ;  class s {  } ; asm volatile ("" :  :  :=
 );
; }; int a[] =3D {};; x; ;  class s {  } ; const ; x; ~-1 - 0; }; 0 << 0 >>=
 0;
&f; s; __builtin_constant_p(2); ;;  struct s restrict ; struct t: s {} ; };=
 }=20
class &&l {  } ;; } void T( int *x) { f(); }
      |=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20
                                                                  ^

crash1.cc:1:242: note: 'int x' previously declared here
    1 | () { return 1.2345 * 0 / 01e9; try {  enum s {  }  a[] =3D { 0 };;
__attribute__ ((noinline(2))); a || -1ULL; } catch (int x) { int a[] =3D { =
0 };
struct s {  }; struct t: s {} ; try { (x %=3D 0); (x =3D=3D 0); l:; } catch=
 (int x) {
auto x =3D f();  struct s {}; struct l: s {} t; 0 - 0; 0 + 0; } [] ( union =
s {} )
{};f; (sizeof(x) =3D=3D __builtin_popcount(x)); if (sizeof ((void) sizeof(c=
har[1 -
2 * x]))) { register const ; extern void; ; asm("" : "=3Da"(x), "=3Dd"(x) :=
 "r"
(x), "0" (x), "1" (x));  void; } else { for (unsigned int i =3D f(); i < .1=
; i++)
{ for (unsigned int i =3D (x =3D=3D 0); i < &&l; i++) { ; __builtin_inf();
__builtin_alloca(1); alignof(x); ;  class s {  } ; asm volatile ("" :  :  :=
 );
; }; int a[] =3D {};; x; ;  class s {  } ; const ; x; ~-1 - 0; }; 0 << 0 >>=
 0;
&f; s; __builtin_constant_p(2); ;;  struct s restrict ; struct t: s {} ; };=
 }=20
class &&l {  } ;; } void T( int *x) { f(); }
      |=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20
                                                                  ^

crash1.cc:1:322: error: types may not be defined in parameter types
    1 | (noinline(2))); a || -1ULL; } catch (int x) { int a[] =3D { 0 }; st=
ruct s
{  }; struct t: s {} ; try { (x %=3D 0); (x =3D=3D 0); l:; } catch (int x) =
{ auto x =3D
f();  struct s {}; struct l: s {} t; 0 - 0; 0 + 0; } [] ( union s {} ) {};f;
(sizeof(x) =3D=3D __builtin_popcount(x)); if (sizeof ((void) sizeof(char[1 =
- 2 *
x]))) { register const ; extern void; ; asm("" : "=3Da"(x), "=3Dd"(x) : "r"=
 (x),
"0" (x), "1" (x));  void; } else { for (unsigned int i =3D f(); i < .1; i++=
) {
for (unsigned int i =3D (x =3D=3D 0); i < &&l; i++) { ; __builtin_inf();
__builtin_alloca(1); alignof(x); ;  class s {  } ; asm volatile ("" :  :  :=
 );
; }; int a[] =3D {};; x; ;  class s {  } ; const ; x; ~-1 - 0; }; 0 << 0 >>=
 0;
&f; s; __builtin_constant_p(2); ;;  struct s restrict ; struct t: s {} ; };=
 }=20
class &&l {  } ;; } void T( int *x) { f(); }
      |=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20
                                                                  ^

g++-10: internal compiler error: Segmentation fault signal terminated progr=
am
cc1plus
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-10/README.Bugs> for instructions.
--- g++-10 crash log ends ---=