test/hotspot/gtest/gc/shared/test_collectedHeap.cpp

/*
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#include "precompiled.hpp"
#include "gc/shared/collectedHeap.hpp"
#include "unittest.hpp"

TEST_VM(CollectedHeap, is_in) {
  CollectedHeap* heap = Universe::heap();

  uintptr_t epsilon = (uintptr_t) MinObjAlignment;
  uintptr_t heap_start = (uintptr_t) heap->reserved_region().start();
  uintptr_t heap_end = (uintptr_t) heap->reserved_region().end();

  // Test that NULL is not in the heap.
  ASSERT_FALSE(heap->is_in(NULL)) << "NULL is unexpectedly in the heap";

  // Test that a pointer to before the heap start is reported as outside the heap.
  ASSERT_GE(heap_start, ((uintptr_t) NULL + epsilon))
          << "Sanity check - heap should not start at 0";

  void* before_heap = (void*) (heap_start - epsilon);
  ASSERT_FALSE(heap->is_in(before_heap)) << "before_heap: " << p2i(before_heap)
          << " is unexpectedly in the heap";

  // Test that a pointer to after the heap end is reported as outside the heap.
  ASSERT_LE(heap_end, ((uintptr_t)-1 - epsilon))
          << "Sanity check - heap should not end at the end of address space";

  void* after_heap = (void*) (heap_end + epsilon);
  ASSERT_FALSE(heap->is_in(after_heap)) << "after_heap: " << p2i(after_heap)
          << " is unexpectedly in the heap";
}