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Diffstat (limited to '')
-rw-r--r-- | xpcom/tests/gtest/TestAllocReplacement.cpp | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/xpcom/tests/gtest/TestAllocReplacement.cpp b/xpcom/tests/gtest/TestAllocReplacement.cpp new file mode 100644 index 0000000000..4b2c41b0f3 --- /dev/null +++ b/xpcom/tests/gtest/TestAllocReplacement.cpp @@ -0,0 +1,106 @@ +/* -*- 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 + +#if defined(XP_WIN) +# include <windows.h> + +# undef ASSERT_ALLOCATION_HAPPENED +# define ASSERT_ALLOCATION_HAPPENED(lambda) \ + ASSERT_TRUE(ValidateHookedAllocation( \ + lambda, [](void* p) { HeapFree(GetProcessHeap(), 0, p); })); + +TEST(AllocReplacement, HeapAlloc_check) +{ + ASSERT_ALLOCATION_HAPPENED([] { + HANDLE h = GetProcessHeap(); + return HeapAlloc(h, 0, kAllocAmount); + }); +} + +TEST(AllocReplacement, HeapReAlloc_check) +{ + ASSERT_ALLOCATION_HAPPENED([] { + HANDLE h = GetProcessHeap(); + void* p = HeapAlloc(h, 0, kAllocAmount / 2); + + if (!p) { + return static_cast<void*>(nullptr); + } + + return HeapReAlloc(h, 0, p, kAllocAmount); + }); +} +#endif |