7c79f05cd4
This PR improves the `Promise` API by considering how dropped promises can lead to never-finished tasks.
92 lines
3.5 KiB
C++
92 lines
3.5 KiB
C++
/*
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Copyright (c) 2018 Microsoft Corporation. All rights reserved.
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Released under Apache 2.0 license as described in the file LICENSE.
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Author: Leonardo de Moura
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*/
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#pragma once
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#include <functional>
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#include <vector>
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#include <unordered_map>
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#include "runtime/object.h"
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namespace lean {
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typedef lean_object * object_offset;
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class LEAN_EXPORT object_compactor {
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struct max_sharing_table;
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friend struct max_sharing_hash;
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friend struct max_sharing_eq;
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std::unordered_map<object*, object_offset, std::hash<object*>, std::equal_to<object*>> m_obj_table;
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std::unique_ptr<max_sharing_table> m_max_sharing_table;
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std::vector<object*> m_todo;
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std::vector<object_offset> m_tmp;
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// On-disk base address used for `mmap`ing compacted regions without relocations
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// References within the compacted region are rewritten by subtracting `m_begin` and adding `m_base_addr`
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// In the simplest case `base_addr == nullptr`, we get region-relative pointers
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void * m_base_addr;
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void * m_begin;
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void * m_end;
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void * m_capacity;
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size_t capacity() const { return static_cast<char*>(m_capacity) - static_cast<char*>(m_begin); }
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void save(object * o, object * new_o);
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void save_max_sharing(object * o, object * new_o, size_t new_o_sz);
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void * alloc(size_t sz);
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object_offset to_offset(object * o);
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void insert_terminator(object * o);
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object * copy_object(object * o);
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bool insert_constructor(object * o);
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bool insert_array(object * o);
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void insert_sarray(object * o);
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void insert_string(object * o);
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bool insert_thunk(object * o);
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bool insert_task(object * o);
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bool insert_promise(object * o);
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bool insert_ref(object * o);
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void insert_mpz(object * o);
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public:
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object_compactor(void * base_addr = nullptr);
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object_compactor(object_compactor const &) = delete;
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object_compactor(object_compactor &&) = delete;
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~object_compactor();
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object_compactor operator=(object_compactor const &) = delete;
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object_compactor operator=(object_compactor &&) = delete;
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void operator()(object * o);
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size_t size() const { return static_cast<char*>(m_end) - static_cast<char*>(m_begin); }
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void const * data() const { return m_begin; }
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};
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class LEAN_EXPORT compacted_region {
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// see `object_compactor::m_base_addr`
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void * m_base_addr;
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bool m_is_mmap;
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std::function<void()> m_free_data;
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void * m_begin;
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void * m_next;
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void * m_end;
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void move(size_t d);
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void move(object * o);
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object * fix_object_ptr(object * o);
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void fix_constructor(object * o);
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void fix_array(object * o);
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void fix_thunk(object * o);
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void fix_ref(object * o);
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void fix_task(object * o);
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void fix_promise(object * o);
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void fix_mpz(object * o);
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public:
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/* Creates a compacted object region using the given region in memory.
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This object takes ownership of the region. */
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compacted_region(size_t sz, void * data, void * base_addr, bool is_mmap, std::function<void()> free_data);
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/* Creates a compacted object region using the object_compactor current state.
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It creates a copy of the compacted region generated by the object compactor. */
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explicit compacted_region(object_compactor const & c);
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compacted_region(compacted_region const &) = delete;
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compacted_region(compacted_region &&) = delete;
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~compacted_region();
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compacted_region operator=(compacted_region const &) = delete;
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compacted_region operator=(compacted_region &&) = delete;
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object * read();
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bool is_memory_mapped() const { return m_is_mmap; }
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};
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}
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