File: vtable-may-alias.cpp

package info (click to toggle)
llvm-toolchain-21 1%3A21.1.6-3
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid
  • size: 2,245,028 kB
  • sloc: cpp: 7,619,726; ansic: 1,434,018; asm: 1,058,748; python: 252,740; f90: 94,671; objc: 70,685; lisp: 42,813; pascal: 18,401; sh: 8,601; ml: 5,111; perl: 4,720; makefile: 3,675; awk: 3,523; javascript: 2,409; xml: 892; fortran: 770
file content (25 lines) | stat: -rw-r--r-- 431 bytes parent folder | download | duplicates (37) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
 
// RUN: %clangxx_cfi -o %t %s
// RUN: %run %t

// In this example, both __typeid_A_global_addr and __typeid_B_global_addr will
// refer to the same address. Make sure that the compiler does not assume that
// they do not alias.

struct A {
  virtual void f() = 0;
};

struct B : A {
  virtual void f() {}
};

__attribute__((weak)) void foo(void *p) {
  B *b = (B *)p;
  A *a = (A *)b;
  a->f();
}

int main() {
  B b;
  foo(&b);
}