lib/lsan/lit_tests/TestCases/use_registers.cc

   1 // Test that registers of running threads are included in the root set.
   2 // RUN: LSAN_BASE="report_objects=1:use_stacks=0"
   3 // RUN: %clangxx_lsan -pthread %s -o %t
   4 // RUN: LSAN_OPTIONS=$LSAN_BASE:"use_registers=0" not %t 2>&1 | FileCheck %s
   5 // RUN: LSAN_OPTIONS=$LSAN_BASE:"use_registers=1" %t 2>&1
   6 // RUN: LSAN_OPTIONS="" %t 2>&1
   7
   8 #include <assert.h>
   9 #include <pthread.h>
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12
  13 extern "C"
  14 void *registers_thread_func(void *arg) {
  15   int *sync = reinterpret_cast<int *>(arg);
  16   void *p = malloc(1337);
  17   // To store the pointer, choose a register which is unlikely to be reused by
  18   // a function call.
  19 #if defined(__i386__)
  20   asm ( "mov %0, %%esi"
  21       :
  22       : "r" (p)
  23       );
  24 #elif defined(__x86_64__)
  25   asm ( "mov %0, %%r15"
  26       :
  27       : "r" (p)
  28       );
  29 #else
  30 #error "Test is not supported on this architecture."
  31 #endif
  32   fprintf(stderr, "Test alloc: %p.\n", p);
  33   fflush(stderr);
  34   __sync_fetch_and_xor(sync, 1);
  35   while (true)
  36     pthread_yield();
  37 }
  38
  39 int main() {
  40   int sync = 0;
  41   pthread_t thread_id;
  42   int res = pthread_create(&thread_id, 0, registers_thread_func, &sync);
  43   assert(res == 0);
  44   while (!__sync_fetch_and_xor(&sync, 0))
  45     pthread_yield();
  46   return 0;
  47 }
  48 // CHECK: Test alloc: [[ADDR:.*]].
  49 // CHECK: Directly leaked 1337 byte object at [[ADDR]]
  50 // CHECK: LeakSanitizer: detected memory leaks
  51 // CHECK: SUMMARY: {{(Leak|Address)}}Sanitizer: