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#include "sanitizer_common/print_address.h"
8#include <assert.h>
9#include <pthread.h>
10#include <sched.h>
11#include <stdio.h>
12#include <stdlib.h>
13
14int sync = 0;
15
16extern "C" void *registers_thread_func(void *) {
17 void *p = malloc(size: 1337);
18 print_address("Test alloc: ", 1, p);
19 fflush(stderr);
20
21 while(true) {
22 // To store the pointer, choose a register which is unlikely to be reused by
23 // a function call.
24#if defined(__i386__) || defined(__i686__)
25 asm("mov %0, %%edi"
26 :
27 : "r"(p));
28#elif defined(__x86_64__)
29 asm("mov %0, %%r15"
30 :
31 : "r"(p));
32#elif defined(__mips__)
33 asm("move $16, %0"
34 :
35 : "r"(p));
36#elif defined(__arm__)
37 asm("mov r5, %0"
38 :
39 : "r"(p));
40#elif defined(__aarch64__)
41 // x9-10 are used. x11-12 are probably used.
42 // So we pick x13 to be safe and x14 as a backup.
43 // (x13 known to be used on Ubuntu Focal)
44 asm("mov x13, %0\n"
45 "mov x14, %0"
46 :
47 : "r"(p));
48#elif defined(__loongarch_lp64)
49 asm("move $s8, %0" : : "r"(p));
50#elif defined(__powerpc__)
51 asm("mr 30, %0"
52 :
53 : "r"(p));
54#elif defined(__s390x__)
55 asm("lgr %%r10, %0"
56 :
57 : "r"(p));
58#elif defined(__riscv)
59 asm("mv s11, %0"
60 :
61 : "r"(p));
62#else
63#error "Test is not supported on this architecture."
64#endif
65 __sync_fetch_and_xor(&sync, 1);
66 }
67}
68
69int main() {
70 pthread_t thread_id;
71 int res = pthread_create(newthread: &thread_id, attr: 0, start_routine: registers_thread_func, arg: nullptr);
72 assert(res == 0);
73 while (!__sync_fetch_and_xor(&sync, 0))
74 sched_yield();
75 return 0;
76}
77// CHECK: Test alloc: [[ADDR:0x[0-9,a-f]+]]
78// CHECK: LeakSanitizer: detected memory leaks
79// CHECK: [[ADDR]] (1337 bytes)
80// CHECK: SUMMARY: {{.*}}Sanitizer:
81

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