llvm-project

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// RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
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#include "java.h"
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jptr varaddr;
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jptr varaddr2;
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void *Thread(void *p) {
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  barrier_wait(&barrier);
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  *(int*)varaddr2 = 42;
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  return 0;
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}
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int main() {
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  barrier_init(&barrier, 2);
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  int const kHeapSize = 1024 * 1024;
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  jptr jheap = (jptr)malloc(kHeapSize + 8) + 8;
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  __tsan_java_init(jheap, kHeapSize);
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  const int kBlockSize = 64;
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  int const kMove = 1024;
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  __tsan_java_alloc(jheap, kBlockSize);
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  varaddr = jheap + 16;
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  varaddr2 = varaddr + kMove;
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  pthread_t th;
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  pthread_create(&th, 0, Thread, 0);
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  *(int*)varaddr = 43;
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  __tsan_java_move(varaddr, varaddr2, kBlockSize);
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  barrier_wait(&barrier);
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  pthread_join(th, 0);
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  __tsan_java_free(varaddr2, kBlockSize);
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  fprintf(stderr, "DONE\n");
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  return __tsan_java_fini();
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}
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// Note: there is a race on the moved object (which we used to detect),
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// but now __tsan_java_move resets the object shadow, so we don't detect it anymore.
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// CHECK-NOT: WARNING: ThreadSanitizer: data race
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// CHECK: DONE
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