node/deps/v8/test/cctest/test-list.cc

// Copyright 2009 the V8 project authors. All rights reserved.
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#include <stdlib.h>
#include <string.h>
#include "v8.h"
#include "cctest.h"

using namespace v8::internal;

// Use a testing allocator that clears memory before deletion.
class ZeroingAllocationPolicy {
 public:
  static void* New(size_t size) {
    // Stash the size in the first word to use for Delete.
    size_t true_size = size + sizeof(size_t);
    size_t* result = reinterpret_cast<size_t*>(malloc(true_size));
    if (result == NULL) return result;
    *result = true_size;
    return result + 1;
  }

  static void Delete(void* ptr) {
    size_t* true_ptr = reinterpret_cast<size_t*>(ptr) - 1;
    memset(true_ptr, 0, *true_ptr);
    free(true_ptr);
  }
};

// Check that we can add (a reference to) an element of the list
// itself.
TEST(ListAdd) {
  // Add elements to the list to grow it to its capacity.
  List<int, ZeroingAllocationPolicy> list(4);
  list.Add(1);
  list.Add(2);
  list.Add(3);
  list.Add(4);

  // Add an existing element, the backing store should have to grow.
  list.Add(list[0]);
  ASSERT(list[4] == 1);
}