68 lines
2.2 KiB
C++
68 lines
2.2 KiB
C++
#if OS_WINDOWS
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// This file is included in Arena.cpp, so we don't need to include headers here.
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void platform_init (Arena* arena, s64 new_reserve) {
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s64 page_aligned_reserve_size = Align_To_Page_Size(new_reserve);
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void* address_start =
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VirtualAlloc(nullptr, (u64)page_aligned_reserve_size, MEM_RESERVE, PAGE_READWRITE);
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if (address_start == nullptr) {
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// get error value and string?
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s32 error_code = GetLastError();
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return;
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// #TODO(LOG) log_error("In Arena:platform_init, VirtualAlloc failed with code %d\n", error_code)
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}
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arena->memory_base = (u8*)address_start;
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}
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void extend_committed_pages (Arena* arena, u8* end) {
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s64 delta = end - arena->first_uncommitted_page;
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Assert(delta >= 0);
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s64 size = Align_To_Page_Size(delta);
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VirtualAlloc(arena->first_uncommitted_page, (u64)size, MEM_COMMIT, PAGE_READWRITE);
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// arena_lock_pages(arena, arena->first_uncommitted_page, size);
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arena->first_uncommitted_page += size;
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}
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void free_pages_down_to (Arena* arena, s64 pages_to_keep) {
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if (arena == nullptr) return;
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Assert(pages_to_keep >= 1); // Always keep one page because we bootstrap a lot.
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s64 bytes_to_keep = pages_to_keep * PLATFORM_MEMORY_PAGE_SIZE;
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if (bytes_to_keep >= reserve_size(arena)) {
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Assert(false); // Break in debug builds, but release we just do nothing.
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return; // just do nothing here. Maybe we should assert?
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}
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u64 bytes_committed = (u64)(arena->first_uncommitted_page - arena->memory_base);
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if (bytes_to_keep > (s64)bytes_committed) {
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return; // nothing to free
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}
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u8* start_address = arena->memory_base + bytes_to_keep;
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u64 bytes_to_decommit = (u64)(arena->first_uncommitted_page - start_address);
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// arena_unlock_pages(arena, start_address, (s64)bytes_to_decommit);
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VirtualFree(start_address, bytes_to_decommit, MEM_DECOMMIT);
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arena->first_uncommitted_page = start_address;
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}
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void arena_delete (Arena* arena) {
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if (!is_valid(arena)) return;
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bool arena_was_boostrapped = (arena->flags & Arena_Flags::Is_Bootstrapped) == Arena_Flags::Is_Bootstrapped;
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VirtualFree(arena->memory_base, 0, MEM_RELEASE);
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if (!arena_was_boostrapped) {
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arena->memory_base = nullptr;
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}
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}
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#endif
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