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