47 lines
2.3 KiB
C
47 lines
2.3 KiB
C
// Just an idea I had so that we can start with a small arena and increase on an as-needed basis,
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// this way allocations are always extremely fast.
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// The full structure is 80B, and because we use bootstrapping, we only need a little extra memory for storing
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// the `next_arenas` pointers
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// DO NOT MERGE WITH `Arena`, we need fixed size arenas so that we can back
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// `ArenaArray`s.
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struct ExpandableArena {
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u8* current_point = nullptr;
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u8* memory_base = nullptr;
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u8* first_uncommitted_page = nullptr;
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u16 alignment = CPU_REGISTER_WIDTH_BYTES;
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Arena_Reserve reserve_size = Arena_Reserve::Size_64K;
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Arena_Flags flags = Arena_Flags::None;
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u32 initial_commit_page_count = ARENA_DEFAULT_COMMIT_PAGE_COUNT;
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// Note that this downcasts to Arena*, so can be initialized in the same way.
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Arena* current;
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Array<Arena*> next_arenas;
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#if BUILD_DEBUG
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string info;
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string file_path;
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string function_name;
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s32 line_number;
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#endif
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};
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#if BUILD_DEBUG
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#define bootstrap_expandable_arena(_reserve_) \
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bootstrap_expandable_arena_internal((_reserve_), (s32)ARENA_DEFAULT_COMMIT_PAGE_COUNT, __FILE__, __FUNCTION__, __LINE__)
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#else
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#define bootstrap_expandable_arena(_reserve_) \
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bootstrap_expandable_arena_internal((_reserve_), (s32)ARENA_DEFAULT_COMMIT_PAGE_COUNT)
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#endif
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ExpandableArena* bootstrap_expandable_arena_internal (Arena_Reserve new_reserve=Arena_Reserve::Size_64K, s32 commit_page_count=ARENA_DEFAULT_COMMIT_PAGE_COUNT,
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string file_path="", string function_name="", s32 line_number=0);
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// ExpandableArena* bootstrap_expandable_arena_internal (Arena_Reserve starting_reserve=Arena_Reserve::Size_64K, s32 commit_page_count=8);
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void* expandable_arena_allocator_proc (Allocator_Mode mode, s64 requested_size, s64 old_size, void* old_memory, void* allocator_data);
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bool is_valid (ExpandableArena* arena);
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void* expandable_arena_alloc (ExpandableArena* arena_ex, s64 byte_count);
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u8* expandable_arena_start (ExpandableArena* arena_ex);
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Allocator allocator (ExpandableArena* arena_ex);
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void arena_reset_to (ExpandableArena* arena_ex, Arena* last_arena, u8* starting_point);
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void arena_reset (ExpandableArena* arena_ex, bool free_extra_pages);
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force_inline void arena_delete (ExpandableArena* arena_ex);
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