text: // Test that registers of running threads are included in the root set.
  // RUN: %clangxx_lsan -pthread %s -o %t
  // RUN: %env_lsan_opts="report_objects=1:use_stacks=0:use_registers=0" not %run %t 2>&1 | FileCheck %s
  // RUN: %env_lsan_opts="report_objects=1:use_stacks=0:use_registers=1" %run %t 2>&1
  // RUN: %env_lsan_opts="" %run %t 2>&1
  
  // FIXME: Support more platforms.
  // REQUIRES: x86-target-arch && linux
  
  #include "sanitizer_common/print_address.h"
  #include <assert.h>
  #include <pthread.h>
  #include <sched.h>
  #include <stdio.h>
  #include <stdlib.h>
  
  extern "C" void *registers_thread_func(void *arg) {
    int *sync = reinterpret_cast<int *>(arg);
    void *p = malloc(1337);
    print_address("Test alloc: ", 1, p);
    fflush(stderr);
  
    // To store the pointer, choose a register which is unlikely to be reused by
    // a function call.
  #if defined(__i386__)
    asm(R"(
      movd %0, %%xmm0
      mov $0, %0
    )"
        :
        : "r"(p));
  #elif defined(__x86_64__)
    asm(R"(
      movq %0, %%xmm0
      mov $0, %0
    )"
        :
        : "r"(p));
  #else
  #error "Test is not supported on this architecture."
  #endif
  
    __sync_fetch_and_xor(sync, 1);
    while (true)
      sched_yield();
  }
  
  int main() {
    int sync = 0;
    pthread_t thread_id;
    int res = pthread_create(&thread_id, 0, registers_thread_func, &sync);
    assert(res == 0);
    while (!__sync_fetch_and_xor(&sync, 0))
      sched_yield();
    return 0;
  }
  // CHECK: Test alloc: [[ADDR:0x[0-9,a-f]+]]
  // CHECK: LeakSanitizer: detected memory leaks
  // CHECK: [[ADDR]] (1337 bytes)
  // CHECK: SUMMARY: {{(Leak|Address)}}Sanitizer:
  