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