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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozmemory.h"
#include "gtest/gtest.h"
// We want to ensure that various functions are hooked properly and that
// allocations are getting routed through jemalloc. The strategy
// pursued below relies on jemalloc_info_ptr knowing about the pointers
// returned by the allocator. If the function has been hooked correctly,
// then jemalloc_info_ptr returns a TagLiveAlloc tag, or TagUnknown
// otherwise.
// We could also check the hooking of |free| and similar functions: once
// we free() the returned pointer, jemalloc_info_ptr would return a tag
// that is not TagLiveAlloc. However, in the GTests environment, with
// other threads running in the background, it is possible for some of
// them to get a new allocation at the same location we just freed, and
// jemalloc_info_ptr would return a TagLiveAlloc tag.
#define ASSERT_ALLOCATION_HAPPENED(lambda) \
ASSERT_TRUE(ValidateHookedAllocation(lambda, free));
// We do run the risk of OOM'ing when we allocate something...all we can
// do is try to allocate something so small that OOM'ing is unlikely.
const size_t kAllocAmount = 16;
static bool ValidateHookedAllocation(void* (*aAllocator)(void),
void (*aFreeFunction)(void*)) {
void* p = aAllocator();
if (!p) {
return false;
}
jemalloc_ptr_info_t info;
jemalloc_ptr_info(p, &info);
// Regardless of whether that call succeeded or failed, we are done with
// the allocated buffer now.
aFreeFunction(p);
return (info.tag == PtrInfoTag::TagLiveAlloc);
}
TEST(AllocReplacement, malloc_check)
{
ASSERT_ALLOCATION_HAPPENED([] { return malloc(kAllocAmount); });
}
TEST(AllocReplacement, calloc_check)
{
ASSERT_ALLOCATION_HAPPENED([] { return calloc(1, kAllocAmount); });
}
TEST(AllocReplacement, realloc_check)
{
ASSERT_ALLOCATION_HAPPENED([] { return realloc(nullptr, kAllocAmount); });
}
#if defined(HAVE_POSIX_MEMALIGN)
TEST(AllocReplacement, posix_memalign_check)
{
ASSERT_ALLOCATION_HAPPENED([] {
void* p = nullptr;
int result = posix_memalign(&p, sizeof(void*), kAllocAmount);
if (result != 0) {
return static_cast<void*>(nullptr);
}
return p;
});
}
#endif
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