lib/msan/lit_tests/no_sanitize_memory_prop.cc

   1 // RUN: %clangxx_msan -m64 -O0 %s -o %t && %t >%t.out 2>&1
   2 // RUN: %clangxx_msan -m64 -O1 %s -o %t && not %t >%t.out 2>&1
   3 // RUN: FileCheck %s < %t.out
   4 // RUN: %clangxx_msan -m64 -O2 %s -o %t && not %t >%t.out 2>&1
   5 // RUN: FileCheck %s < %t.out
   6 // RUN: %clangxx_msan -m64 -O3 %s -o %t && not %t >%t.out 2>&1
   7 // RUN: FileCheck %s < %t.out
   8
   9 // Test that (no_sanitize_memory) functions propagate shadow.
  10
  11 // Note that at -O0 there is no report, because 'x' in 'f' is spilled to the
  12 // stack, and then loaded back as a fully initialiazed value (due to
  13 // no_sanitize_memory attribute).
  14
  15 #include <stdlib.h>
  16 #include <stdio.h>
  17
  18 __attribute__((noinline))
  19 __attribute__((no_sanitize_memory))
  20 int f(int x) {
  21   return x;
  22 }
  23
  24 int main(void) {
  25   int x;
  26   int * volatile p = &x;
  27   int y = f(*p);
  28   // CHECK: WARNING: MemorySanitizer: use-of-uninitialized-value
  29   // CHECK: {{#0 0x.* in main .*no_sanitize_memory_prop.cc:}}[[@LINE+1]]
  30   if (y)
  31     exit(0);
  32   return 0;
  33 }