compiler-rt/test/tsan/java_heap_init.cpp

   1 // RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
   2 #include "java.h"
   3 #include <errno.h>
   4 #include <sys/mman.h>
   5
   6 int main() {
   7   // Test that munmap interceptor resets meta shadow for the memory range.
   8   // Previously __tsan_java_move failed because it encountered non-zero meta
   9   // shadow for the destination.
  10   int const kHeapSize = 1024 * 1024;
  11   jptr jheap = (jptr)mmap(0, kHeapSize, PROT_READ | PROT_WRITE,
  12       MAP_ANON | MAP_PRIVATE, -1, 0);
  13   if (jheap == (jptr)MAP_FAILED)
  14     return printf("mmap failed with %d\n", errno);
  15   __atomic_store_n((int*)jheap, 1, __ATOMIC_RELEASE);
  16   munmap((void*)jheap, kHeapSize);
  17   jheap = (jptr)mmap((void*)jheap, kHeapSize, PROT_READ | PROT_WRITE,
  18       MAP_ANON | MAP_PRIVATE, -1, 0);
  19   if (jheap == (jptr)MAP_FAILED)
  20     return printf("second mmap failed with %d\n", errno);
  21   __tsan_java_init(jheap, kHeapSize);
  22   __tsan_java_move(jheap + 16, jheap, 16);
  23   fprintf(stderr, "DONE\n");
  24   return __tsan_java_fini();
  25 }
  26
  27 // CHECK-NOT: WARNING: ThreadSanitizer: data race
  28 // CHECK: DONE