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 
17 extern "C" void *registers_thread_func(void *arg) {
18   int *sync = reinterpret_cast<int *>(arg);
19   void *p = malloc(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 
48 int main() {
49   int sync = 0;
50   pthread_t thread_id;
51   int res = pthread_create(&thread_id, 0, registers_thread_func, &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: {{(Leak|Address)}}Sanitizer:
61