mirror of
https://github.com/matrix-construct/construct
synced 2024-08-23 01:54:46 +02:00
369 lines
7 KiB
C++
369 lines
7 KiB
C++
// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies. The
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// full license for this software is available in the LICENSE file.
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// Uncomment or -D this #define to enable our own crude but simple ability to
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// profile dynamic memory usage. Global `new` and `delete` will be captured
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// here by this definition file into thread_local counters accessible via
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// ircd::allocator::profile. This feature allows the developer to find out if
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// allocations are occurring during some scope by sampling the counters.
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//
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// #define RB_PROF_ALLOC
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bool
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__attribute__((weak))
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ircd::allocator::trim(const size_t &pad)
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noexcept
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{
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return false;
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}
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ircd::string_view
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__attribute__((weak))
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ircd::allocator::get(const string_view &key,
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const mutable_buffer &buf)
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{
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return {};
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}
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ircd::string_view
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__attribute__((weak))
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ircd::allocator::set(const string_view &key,
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const string_view &val,
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const mutable_buffer &cur)
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{
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return {};
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}
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//
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// allocator::state
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//
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void
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ircd::allocator::state::deallocate(const uint &pos,
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const size_type &n)
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{
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for(size_t i(0); i < n; ++i)
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{
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assert(test(pos + i));
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btc(pos + i);
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}
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last = pos;
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}
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uint
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ircd::allocator::state::allocate(const size_type &n,
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const uint &hint)
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{
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const auto ret
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{
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allocate(std::nothrow, n, hint)
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};
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if(unlikely(ret >= size))
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throw std::bad_alloc();
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return ret;
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}
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uint
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ircd::allocator::state::allocate(std::nothrow_t,
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const size_type &n,
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const uint &hint)
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{
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const auto next(this->next(n));
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if(unlikely(next >= size)) // No block of n was found anywhere (next is past-the-end)
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return next;
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for(size_t i(0); i < n; ++i)
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{
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assert(!test(next + i));
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bts(next + i);
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}
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last = next + n;
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return next;
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}
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uint
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ircd::allocator::state::next(const size_t &n)
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const
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{
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uint ret(last), rem(n);
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for(; ret < size && rem; ++ret)
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if(test(ret))
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rem = n;
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else
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--rem;
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if(likely(!rem))
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return ret - n;
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for(ret = 0, rem = n; ret < last && rem; ++ret)
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if(test(ret))
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rem = n;
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else
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--rem;
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if(unlikely(rem)) // The allocator should throw std::bad_alloc if !rem
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return size;
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return ret - n;
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}
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bool
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ircd::allocator::state::available(const size_t &n)
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const
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{
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return this->next(n) < size;
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}
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//
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// allocator::scope
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//
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decltype(ircd::allocator::scope::current)
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ircd::allocator::scope::current;
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ircd::allocator::scope::scope(alloc_closure ac,
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realloc_closure rc,
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free_closure fc)
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:theirs
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{
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current
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}
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,user_alloc
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{
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std::move(ac)
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}
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,user_realloc
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{
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std::move(rc)
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}
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,user_free
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{
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std::move(fc)
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}
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{
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// If an allocator::scope instance already exists somewhere
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// up the stack, *current will already be set. We only install
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// our global hook handlers at the first instance ctor and
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// uninstall it after that first instance dtors.
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if(!current)
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hook_init();
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current = this;
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}
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ircd::allocator::scope::~scope()
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noexcept
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{
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assert(current);
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current = theirs;
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// Reinstall the pre-existing hooks after our last scope instance
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// has destructed (the first to have constructed). We know this when
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// current becomes null.
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if(!current)
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hook_fini();
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}
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void
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__attribute__((weak))
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ircd::allocator::scope::hook_init()
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noexcept
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{
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}
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void
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__attribute__((weak))
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ircd::allocator::scope::hook_fini()
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noexcept
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{
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}
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//
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// allocator::profile
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//
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thread_local ircd::allocator::profile
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ircd::allocator::profile::this_thread
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{};
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ircd::allocator::profile
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ircd::allocator::operator-(const profile &a,
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const profile &b)
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{
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profile ret(a);
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ret -= b;
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return ret;
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}
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ircd::allocator::profile
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ircd::allocator::operator+(const profile &a,
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const profile &b)
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{
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profile ret(a);
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ret += b;
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return ret;
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}
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ircd::allocator::profile &
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ircd::allocator::operator-=(profile &a,
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const profile &b)
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{
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a.alloc_count -= b.alloc_count;
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a.free_count -= b.free_count;
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a.alloc_bytes -= b.alloc_bytes;
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a.free_bytes -= b.free_bytes;
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return a;
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}
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ircd::allocator::profile &
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ircd::allocator::operator+=(profile &a,
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const profile &b)
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{
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a.alloc_count += b.alloc_count;
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a.free_count += b.free_count;
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a.alloc_bytes += b.alloc_bytes;
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a.free_bytes += b.free_bytes;
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return a;
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}
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//
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// aligned_alloc
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//
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std::unique_ptr<char, decltype(&std::free)>
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ircd::allocator::aligned_alloc(const size_t &alignment_,
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const size_t &size_)
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{
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static const size_t &align_default
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{
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16
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};
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const size_t &alignment
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{
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alignment_?: align_default
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};
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const size_t &size
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{
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size_ % alignment == 0? size_: size_ + (alignment - (size_ % alignment))
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};
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assert(size % alignment == 0);
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assert(size < size_ + alignment);
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assert(alignment % sizeof(void *) == 0);
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void *ret;
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switch(int errc(::posix_memalign(&ret, alignment, size)); errc)
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{
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case 0:
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break;
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case int(std::errc::not_enough_memory):
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throw std::bad_alloc{};
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default:
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throw std::system_error
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{
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errc, std::system_category()
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};
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}
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assert(ret != nullptr);
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assert(uintptr_t(ret) % alignment == 0);
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#ifdef RB_PROF_ALLOC
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auto &this_thread(ircd::allocator::profile::this_thread);
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this_thread.alloc_bytes += size;
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this_thread.alloc_count++;
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#endif
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return
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{
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reinterpret_cast<char *>(ret), &std::free
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};
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}
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#ifdef RB_PROF_ALLOC // --------------------------------------------------
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void *
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__attribute__((alloc_size(1), malloc, returns_nonnull))
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operator new(const size_t size)
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{
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void *const &ptr(::malloc(size));
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if(unlikely(!ptr))
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throw std::bad_alloc();
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auto &this_thread(ircd::allocator::profile::this_thread);
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this_thread.alloc_bytes += size;
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this_thread.alloc_count++;
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return ptr;
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}
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void
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operator delete(void *const ptr)
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{
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::free(ptr);
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auto &this_thread(ircd::allocator::profile::this_thread);
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this_thread.free_count++;
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}
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void
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operator delete(void *const ptr,
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const size_t size)
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{
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::free(ptr);
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auto &this_thread(ircd::allocator::profile::this_thread);
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this_thread.free_bytes += size;
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this_thread.free_count++;
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}
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#endif // RB_PROF_ALLOC --------------------------------------------------
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//
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// Linker symbol wrapping hook
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//
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extern "C" void *__real_malloc(size_t size);
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extern "C" void *__real_calloc(size_t nmemb, size_t size);
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extern "C" void *__real_realloc(void *ptr, size_t size);
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extern "C" void __real_free(void *ptr);
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extern "C" void *
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__wrap_malloc(size_t size)
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{
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return __real_malloc(size);
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}
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extern "C" void *
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__wrap_calloc(size_t nmemb, size_t size)
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{
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return __real_calloc(nmemb, size);
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}
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extern "C" void *
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__wrap_realloc(void *ptr, size_t size)
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{
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return __real_realloc(ptr, size);
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}
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extern "C" void
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__wrap_free(void *ptr)
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{
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return __real_free(ptr);
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}
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