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Diffstat (limited to 'absl/base/internal/malloc_hook.h')
| -rw-r--r-- | absl/base/internal/malloc_hook.h | 284 |
1 files changed, 0 insertions, 284 deletions
diff --git a/absl/base/internal/malloc_hook.h b/absl/base/internal/malloc_hook.h deleted file mode 100644 index 6b006eda..00000000 --- a/absl/base/internal/malloc_hook.h +++ /dev/null @@ -1,284 +0,0 @@ -// -// Copyright 2017 The Abseil Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. -// - -// Some of our malloc implementations can invoke the following hooks whenever -// memory is allocated or deallocated. MallocHook is thread-safe, and things -// you do before calling AddFooHook(MyHook) are visible to any resulting calls -// to MyHook. Hooks must be thread-safe. If you write: -// -// CHECK(MallocHook::AddNewHook(&MyNewHook)); -// -// MyNewHook will be invoked in subsequent calls in the current thread, but -// there are no guarantees on when it might be invoked in other threads. -// -// There are a limited number of slots available for each hook type. Add*Hook -// will return false if there are no slots available. Remove*Hook will return -// false if the given hook was not already installed. -// -// The order in which individual hooks are called in Invoke*Hook is undefined. -// -// It is safe for a hook to remove itself within Invoke*Hook and add other -// hooks. Any hooks added inside a hook invocation (for the same hook type) -// will not be invoked for the current invocation. -// -// One important user of these hooks is the heap profiler. -// -// CAVEAT: If you add new MallocHook::Invoke* calls then those calls must be -// directly in the code of the (de)allocation function that is provided to the -// user and that function must have an ABSL_ATTRIBUTE_SECTION(malloc_hook) -// attribute. -// -// Note: the Invoke*Hook() functions are defined in malloc_hook-inl.h. If you -// need to invoke a hook (which you shouldn't unless you're part of tcmalloc), -// be sure to #include malloc_hook-inl.h in addition to malloc_hook.h. -// -// NOTE FOR C USERS: If you want to use malloc_hook functionality from -// a C program, #include malloc_hook_c.h instead of this file. -// -// IWYU pragma: private, include "base/malloc_hook.h" - -#ifndef ABSL_BASE_INTERNAL_MALLOC_HOOK_H_ -#define ABSL_BASE_INTERNAL_MALLOC_HOOK_H_ - -#include <sys/types.h> -#include <cstddef> - -#include "absl/base/config.h" -#include "absl/base/internal/malloc_hook_c.h" -#include "absl/base/port.h" - -namespace absl { -namespace base_internal { - -// Note: malloc_hook_c.h defines MallocHook_*Hook and -// MallocHook_{Add,Remove}*Hook. The version of these inside the MallocHook -// class are defined in terms of the malloc_hook_c version. See malloc_hook_c.h -// for details of these types/functions. - -class MallocHook { - public: - // The NewHook is invoked whenever an object is being allocated. - // Object pointer and size are passed in. - // It may be passed null pointer if the allocator returned null. - typedef MallocHook_NewHook NewHook; - static bool AddNewHook(NewHook hook); - static bool RemoveNewHook(NewHook hook); - inline static void InvokeNewHook(const void* ptr, size_t size); - - // The DeleteHook is invoked whenever an object is being deallocated. - // Object pointer is passed in. - // It may be passed null pointer if the caller is trying to delete null. - typedef MallocHook_DeleteHook DeleteHook; - static bool AddDeleteHook(DeleteHook hook); - static bool RemoveDeleteHook(DeleteHook hook); - inline static void InvokeDeleteHook(const void* ptr); - - // The SampledNewHook is invoked for some subset of object allocations - // according to the sampling policy of an allocator such as tcmalloc. - // SampledAlloc has the following fields: - // * AllocHandle handle: to be set to an effectively unique value (in this - // process) by allocator. - // * size_t allocated_size: space actually used by allocator to host the - // object. Not necessarily equal to the requested size due to alignment - // and other reasons. - // * double weight: the expected number of allocations matching this profile - // that this sample represents. - // * int stack_depth and const void* stack: invocation stack for - // the allocation. - // The allocator invoking the hook should record the handle value and later - // call InvokeSampledDeleteHook() with that value. - typedef MallocHook_SampledNewHook SampledNewHook; - typedef MallocHook_SampledAlloc SampledAlloc; - static bool AddSampledNewHook(SampledNewHook hook); - static bool RemoveSampledNewHook(SampledNewHook hook); - inline static void InvokeSampledNewHook(const SampledAlloc* sampled_alloc); - - // The SampledDeleteHook is invoked whenever an object previously chosen - // by an allocator for sampling is being deallocated. - // The handle identifying the object --as previously chosen by - // InvokeSampledNewHook()-- is passed in. - typedef MallocHook_SampledDeleteHook SampledDeleteHook; - typedef MallocHook_AllocHandle AllocHandle; - static bool AddSampledDeleteHook(SampledDeleteHook hook); - static bool RemoveSampledDeleteHook(SampledDeleteHook hook); - inline static void InvokeSampledDeleteHook(AllocHandle handle); - - // The PreMmapHook is invoked with mmap's or mmap64's arguments just - // before the mmap/mmap64 call is actually made. Such a hook may be useful - // in memory limited contexts, to catch allocations that will exceed - // a memory limit, and take outside actions to increase that limit. - typedef MallocHook_PreMmapHook PreMmapHook; - static bool AddPreMmapHook(PreMmapHook hook); - static bool RemovePreMmapHook(PreMmapHook hook); - inline static void InvokePreMmapHook(const void* start, - size_t size, - int protection, - int flags, - int fd, - off_t offset); - - // The MmapReplacement is invoked with mmap's arguments and place to put the - // result into after the PreMmapHook but before the mmap/mmap64 call is - // actually made. - // The MmapReplacement should return true if it handled the call, or false - // if it is still necessary to call mmap/mmap64. - // This should be used only by experts, and users must be be - // extremely careful to avoid recursive calls to mmap. The replacement - // should be async signal safe. - // Only one MmapReplacement is supported. After setting an MmapReplacement - // you must call RemoveMmapReplacement before calling SetMmapReplacement - // again. - typedef MallocHook_MmapReplacement MmapReplacement; - static bool SetMmapReplacement(MmapReplacement hook); - static bool RemoveMmapReplacement(MmapReplacement hook); - inline static bool InvokeMmapReplacement(const void* start, - size_t size, - int protection, - int flags, - int fd, - off_t offset, - void** result); - - - // The MmapHook is invoked with mmap's return value and arguments whenever - // a region of memory has been just mapped. - // It may be passed MAP_FAILED if the mmap failed. - typedef MallocHook_MmapHook MmapHook; - static bool AddMmapHook(MmapHook hook); - static bool RemoveMmapHook(MmapHook hook); - inline static void InvokeMmapHook(const void* result, - const void* start, - size_t size, - int protection, - int flags, - int fd, - off_t offset); - - // The MunmapReplacement is invoked with munmap's arguments and place to put - // the result into just before the munmap call is actually made. - // The MunmapReplacement should return true if it handled the call, or false - // if it is still necessary to call munmap. - // This should be used only by experts. The replacement should be - // async signal safe. - // Only one MunmapReplacement is supported. After setting an - // MunmapReplacement you must call RemoveMunmapReplacement before - // calling SetMunmapReplacement again. - typedef MallocHook_MunmapReplacement MunmapReplacement; - static bool SetMunmapReplacement(MunmapReplacement hook); - static bool RemoveMunmapReplacement(MunmapReplacement hook); - inline static bool InvokeMunmapReplacement(const void* start, - size_t size, - int* result); - - // The MunmapHook is invoked with munmap's arguments just before the munmap - // call is actually made. - // TODO(maxim): Rename this to PreMunmapHook for consistency with PreMmapHook - // and PreSbrkHook. - typedef MallocHook_MunmapHook MunmapHook; - static bool AddMunmapHook(MunmapHook hook); - static bool RemoveMunmapHook(MunmapHook hook); - inline static void InvokeMunmapHook(const void* start, size_t size); - - // The MremapHook is invoked with mremap's return value and arguments - // whenever a region of memory has been just remapped. - typedef MallocHook_MremapHook MremapHook; - static bool AddMremapHook(MremapHook hook); - static bool RemoveMremapHook(MremapHook hook); - inline static void InvokeMremapHook(const void* result, - const void* old_addr, - size_t old_size, - size_t new_size, - int flags, - const void* new_addr); - - // The PreSbrkHook is invoked with sbrk's argument just before sbrk is called - // -- except when the increment is 0. This is because sbrk(0) is often called - // to get the top of the memory stack, and is not actually a - // memory-allocation call. It may be useful in memory-limited contexts, - // to catch allocations that will exceed the limit and take outside - // actions to increase such a limit. - typedef MallocHook_PreSbrkHook PreSbrkHook; - static bool AddPreSbrkHook(PreSbrkHook hook); - static bool RemovePreSbrkHook(PreSbrkHook hook); - inline static void InvokePreSbrkHook(ptrdiff_t increment); - - // The SbrkHook is invoked with sbrk's result and argument whenever sbrk - // has just executed -- except when the increment is 0. - // This is because sbrk(0) is often called to get the top of the memory stack, - // and is not actually a memory-allocation call. - typedef MallocHook_SbrkHook SbrkHook; - static bool AddSbrkHook(SbrkHook hook); - static bool RemoveSbrkHook(SbrkHook hook); - inline static void InvokeSbrkHook(const void* result, ptrdiff_t increment); - - // Pointer to a absl::GetStackTrace implementation, following the API in - // base/stacktrace.h. - using GetStackTraceFn = int (*)(void**, int, int); - - // Get the current stack trace. Try to skip all routines up to and - // including the caller of MallocHook::Invoke*. - // Use "skip_count" (similarly to absl::GetStackTrace from stacktrace.h) - // as a hint about how many routines to skip if better information - // is not available. - // Stack trace is filled into *result up to the size of max_depth. - // The actual number of stack frames filled is returned. - static int GetCallerStackTrace(void** result, int max_depth, int skip_count, - GetStackTraceFn get_stack_trace_fn); - -#if ABSL_HAVE_MMAP - // Unhooked versions of mmap() and munmap(). These should be used - // only by experts, since they bypass heapchecking, etc. - // Note: These do not run hooks, but they still use the MmapReplacement - // and MunmapReplacement. - static void* UnhookedMMap(void* start, size_t size, int protection, int flags, - int fd, off_t offset); - static int UnhookedMUnmap(void* start, size_t size); -#endif - - private: - // Slow path versions of Invoke*Hook. - static void InvokeNewHookSlow(const void* ptr, - size_t size) ABSL_ATTRIBUTE_COLD; - static void InvokeDeleteHookSlow(const void* ptr) ABSL_ATTRIBUTE_COLD; - static void InvokeSampledNewHookSlow(const SampledAlloc* sampled_alloc) - ABSL_ATTRIBUTE_COLD; - static void InvokeSampledDeleteHookSlow(AllocHandle handle) - ABSL_ATTRIBUTE_COLD; - static void InvokePreMmapHookSlow(const void* start, size_t size, - int protection, int flags, int fd, - off_t offset) ABSL_ATTRIBUTE_COLD; - static void InvokeMmapHookSlow(const void* result, const void* start, - size_t size, int protection, int flags, int fd, - off_t offset) ABSL_ATTRIBUTE_COLD; - static bool InvokeMmapReplacementSlow(const void* start, size_t size, - int protection, int flags, int fd, - off_t offset, - void** result) ABSL_ATTRIBUTE_COLD; - static void InvokeMunmapHookSlow(const void* ptr, - size_t size) ABSL_ATTRIBUTE_COLD; - static bool InvokeMunmapReplacementSlow(const void* ptr, size_t size, - int* result) ABSL_ATTRIBUTE_COLD; - static void InvokeMremapHookSlow(const void* result, const void* old_addr, - size_t old_size, size_t new_size, int flags, - const void* new_addr) ABSL_ATTRIBUTE_COLD; - static void InvokePreSbrkHookSlow(ptrdiff_t increment) ABSL_ATTRIBUTE_COLD; - static void InvokeSbrkHookSlow(const void* result, - ptrdiff_t increment) ABSL_ATTRIBUTE_COLD; -}; - -} // namespace base_internal -} // namespace absl -#endif // ABSL_BASE_INTERNAL_MALLOC_HOOK_H_ |