src/compiler-rt/test/lsan/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=$LSAN_BASE:"use_registers=0" not %run %t 2>&1 | FileCheck %s
   5 // RUN: LSAN_OPTIONS=$LSAN_BASE:"use_registers=1" %run %t 2>&1
   6 // RUN: LSAN_OPTIONS="" %run %t 2>&1
   7
   8 #include <assert.h>
   9 #include <pthread.h>
  10 #include <sched.h>
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13
  14 extern "C"
  15 void *registers_thread_func(void *arg) {
  16   int *sync = reinterpret_cast<int *>(arg);
  17   void *p = malloc(1337);
  18   // To store the pointer, choose a register which is unlikely to be reused by
  19   // a function call.
  20 #if defined(__i386__)
  21   asm ( "mov %0, %%esi"
  22       :
  23       : "r" (p)
  24       );
  25 #elif defined(__x86_64__)
  26   asm ( "mov %0, %%r15"
  27       :
  28       : "r" (p)
  29       );
  30 #elif defined(__mips__)
  31   asm ( "move $16, %0"
  32       :
  33       : "r" (p)
  34       );
  35 #else
  36 #error "Test is not supported on this architecture."
  37 #endif
  38   fprintf(stderr, "Test alloc: %p.\n", p);
  39   fflush(stderr);
  40   __sync_fetch_and_xor(sync, 1);
  41   while (true)
  42     sched_yield();
  43 }
  44
  45 int main() {
  46   int sync = 0;
  47   pthread_t thread_id;
  48   int res = pthread_create(&thread_id, 0, registers_thread_func, &sync);
  49   assert(res == 0);
  50   while (!__sync_fetch_and_xor(&sync, 0))
  51     sched_yield();
  52   return 0;
  53 }
  54 // CHECK: Test alloc: [[ADDR:.*]].
  55 // CHECK: LeakSanitizer: detected memory leaks
  56 // CHECK: [[ADDR]] (1337 bytes)
  57 // CHECK: SUMMARY: {{(Leak|Address)}}Sanitizer: