71 lines
2.8 KiB
C++
71 lines
2.8 KiB
C++
// Copyright 2016 The Chromium Authors
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_ALLOCATOR_PARTITION_ALLOCATOR_OOM_H_
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#define BASE_ALLOCATOR_PARTITION_ALLOCATOR_OOM_H_
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#include <cstddef>
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#include "base/allocator/partition_allocator/allocation_guard.h"
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#include "base/allocator/partition_allocator/partition_alloc_base/compiler_specific.h"
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#include "base/allocator/partition_allocator/partition_alloc_base/component_export.h"
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#include "build/build_config.h"
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#if BUILDFLAG(IS_WIN)
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#include "base/allocator/partition_allocator/partition_alloc_base/win/windows_types.h"
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#endif
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namespace partition_alloc {
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// Terminates process. Should be called only for out of memory errors.
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// |size| is the size of the failed allocation, or 0 if not known.
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// Crash reporting classifies such crashes as OOM.
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// Must be allocation-safe.
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PA_COMPONENT_EXPORT(PARTITION_ALLOC)
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void TerminateBecauseOutOfMemory(size_t size);
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// Records the size of the allocation that caused the current OOM crash, for
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// consumption by Breakpad.
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// TODO: this can be removed when Breakpad is no longer supported.
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PA_COMPONENT_EXPORT(PARTITION_ALLOC) extern size_t g_oom_size;
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#if BUILDFLAG(IS_WIN)
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namespace win {
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// Custom Windows exception code chosen to indicate an out of memory error.
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// See https://msdn.microsoft.com/en-us/library/het71c37.aspx.
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// "To make sure that you do not define a code that conflicts with an existing
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// exception code" ... "The resulting error code should therefore have the
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// highest four bits set to hexadecimal E."
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// 0xe0000008 was chosen arbitrarily, as 0x00000008 is ERROR_NOT_ENOUGH_MEMORY.
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const DWORD kOomExceptionCode = 0xe0000008;
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} // namespace win
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#endif
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namespace internal {
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// The crash is generated in a PA_NOINLINE function so that we can classify the
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// crash as an OOM solely by analyzing the stack trace. It is tagged as
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// PA_NOT_TAIL_CALLED to ensure that its parent function stays on the stack.
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[[noreturn]] PA_NOT_TAIL_CALLED PA_COMPONENT_EXPORT(
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PARTITION_ALLOC) void OnNoMemory(size_t size);
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// OOM_CRASH(size) - Specialization of IMMEDIATE_CRASH which will raise a custom
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// exception on Windows to signal this is OOM and not a normal assert.
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// OOM_CRASH(size) is called by users of PageAllocator (including
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// PartitionAlloc) to signify an allocation failure from the platform.
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#define OOM_CRASH(size) \
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do { \
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/* Raising an exception might allocate, allow that. */ \
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::partition_alloc::ScopedAllowAllocations guard{}; \
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::partition_alloc::internal::OnNoMemory(size); \
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} while (0)
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} // namespace internal
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} // namespace partition_alloc
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#endif // BASE_ALLOCATOR_PARTITION_ALLOCATOR_OOM_H_
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