compiler-rt/test/lsan/TestCases/use_registers.cpp

   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
  14 extern "C" void *registers_thread_func(void *arg) {
  15   int *sync = reinterpret_cast<int *>(arg);
  16   void *p = malloc(1337);
  17   print_address("Test alloc: ", 1, p);
  18   fflush(stderr);
  19
  20   // To store the pointer, choose a register which is unlikely to be reused by
  21   // a function call.
  22 #if defined(__i386__) || defined(__i686__)
  23   asm("mov %0, %%edi"
  24       :
  25       : "r"(p));
  26 #elif defined(__x86_64__)
  27   asm("mov %0, %%r15"
  28       :
  29       : "r"(p));
  30 #elif defined(__mips__)
  31   asm("move $16, %0"
  32       :
  33       : "r"(p));
  34 #elif defined(__arm__)
  35   asm("mov r5, %0"
  36       :
  37       : "r"(p));
  38 #elif defined(__aarch64__)
  39   // x9-10 are used. x11-12 are probably used.
  40   // So we pick x13 to be safe and x14 as a backup.
  41   // (x13 known to be used on Ubuntu Focal)
  42   asm("mov x13, %0\n"
  43       "mov x14, %0"
  44       :
  45       : "r"(p));
  46 #elif defined(__loongarch_lp64)
  47   asm("move $s8, %0" : : "r"(p));
  48 #elif defined(__powerpc__)
  49   asm("mr 30, %0"
  50       :
  51       : "r"(p));
  52 #elif defined(__s390x__)
  53   asm("lgr %%r10, %0"
  54       :
  55       : "r"(p));
  56 #elif defined(__riscv)
  57   asm("mv s11, %0"
  58       :
  59       : "r"(p));
  60 #else
  61 #error "Test is not supported on this architecture."
  62 #endif
  63   __sync_fetch_and_xor(sync, 1);
  64   while (true)
  65     sched_yield();
  66 }
  67
  68 int main() {
  69   int sync = 0;
  70   pthread_t thread_id;
  71   int res = pthread_create(&thread_id, 0, registers_thread_func, &sync);
  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: