memory_allocator.h | Explore in Territory

// Copyright 2009 Google LLC
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
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// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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#ifndef GOOGLE_BREAKPAD_COMMON_MEMORY_ALLOCATOR_H_
#define GOOGLE_BREAKPAD_COMMON_MEMORY_ALLOCATOR_H_

#include <stdint.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/mman.h>

#include <memory>
#include <vector>

#if defined(MEMORY_SANITIZER)
#include <sanitizer/msan_interface.h>
#endif

#ifdef __APPLE__
#define sys_mmap …
#define sys_munmap …
#define MAP_ANONYMOUS …
#else
#include "third_party/lss/linux_syscall_support.h"
#endif

namespace google_breakpad {

// This is very simple allocator which fetches pages from the kernel directly.
// Thus, it can be used even when the heap may be corrupted.
//
// There is no free operation. The pages are only freed when the object is
// destroyed.
class PageAllocator { … };

// Wrapper to use with STL containers
template <typename T>
struct PageStdAllocator { … };

// A wasteful vector is a std::vector, except that it allocates memory from a
// PageAllocator. It's wasteful because, when resizing, it always allocates a
// whole new array since the PageAllocator doesn't support realloc.
template<class T>
class wasteful_vector : public std::vector<T, PageStdAllocator<T> > { … };

// auto_wasteful_vector allocates space on the stack for N entries to avoid
// using the PageAllocator for small data, while still allowing for larger data.
template<class T, unsigned int N>
class auto_wasteful_vector : public wasteful_vector<T> { … };

}  // namespace google_breakpad

inline void* operator new(size_t nbytes,
                          google_breakpad::PageAllocator& allocator) { … }

#endif  // GOOGLE_BREAKPAD_COMMON_MEMORY_ALLOCATOR_H_
chromium/third_party/breakpad/breakpad/src/common/memory_allocator.h
