1// Test that registers of running threads are included in the root set.
2// RUN: %clangxx_lsan -pthread %s -o %t
3// RUN: %env_lsan_opts="report_objects=1:use_stacks=0:use_registers=0" not %run %t 2>&1 | FileCheck %s
4// RUN: %env_lsan_opts="report_objects=1:use_stacks=0:use_registers=1" %run %t 2>&1
5// RUN: %env_lsan_opts="" %run %t 2>&1
6
7// FIXME: Support more platforms.
8// REQUIRES: x86-target-arch && linux
9
10#include "sanitizer_common/print_address.h"
11#include <assert.h>
12#include <pthread.h>
13#include <sched.h>
14#include <stdio.h>
15#include <stdlib.h>
16
17extern "C" void *registers_thread_func(void *arg) {
18 int *sync = reinterpret_cast<int *>(arg);
19 void *p = malloc(size: 1337);
20 print_address("Test alloc: ", 1, p);
21 fflush(stderr);
22
23 // To store the pointer, choose a register which is unlikely to be reused by
24 // a function call.
25#if defined(__i386__)
26 asm(R"(
27 movd %0, %%xmm0
28 mov $0, %0
29 )"
30 :
31 : "r"(p));
32#elif defined(__x86_64__)
33 asm(R"(
34 movq %0, %%xmm0
35 mov $0, %0
36 )"
37 :
38 : "r"(p));
39#else
40#error "Test is not supported on this architecture."
41#endif
42
43 __sync_fetch_and_xor(sync, 1);
44 while (true)
45 sched_yield();
46}
47
48int main() {
49 int sync = 0;
50 pthread_t thread_id;
51 int res = pthread_create(newthread: &thread_id, attr: 0, start_routine: registers_thread_func, arg: &sync);
52 assert(res == 0);
53 while (!__sync_fetch_and_xor(&sync, 0))
54 sched_yield();
55 return 0;
56}
57// CHECK: Test alloc: [[ADDR:0x[0-9,a-f]+]]
58// CHECK: LeakSanitizer: detected memory leaks
59// CHECK: [[ADDR]] (1337 bytes)
60// CHECK: SUMMARY: {{.*}}Sanitizer:
61

source code of compiler-rt/test/lsan/TestCases/use_registers_extra.cpp