Protocol Buffers - Google's data interchange format (grpc依赖)
https://developers.google.com/protocol-buffers/
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51 lines
1.6 KiB
51 lines
1.6 KiB
// Protocol Buffers - Google's data interchange format |
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// Copyright 2023 Google LLC. All rights reserved. |
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// |
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// Use of this source code is governed by a BSD-style |
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// license that can be found in the LICENSE file or at |
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// https://developers.google.com/open-source/licenses/bsd |
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#ifndef UPB_MEM_INTERNAL_ARENA_H_ |
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#define UPB_MEM_INTERNAL_ARENA_H_ |
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#include "upb/mem/arena.h" |
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// Must be last. |
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#include "upb/port/def.inc" |
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typedef struct _upb_MemBlock _upb_MemBlock; |
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// LINT.IfChange(struct_definition) |
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struct upb_Arena { |
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_upb_ArenaHead head; |
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// upb_alloc* together with a low bit which signals if there is an initial |
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// block. |
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uintptr_t block_alloc; |
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// When multiple arenas are fused together, each arena points to a parent |
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// arena (root points to itself). The root tracks how many live arenas |
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// reference it. |
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// The low bit is tagged: |
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// 0: pointer to parent |
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// 1: count, left shifted by one |
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UPB_ATOMIC(uintptr_t) parent_or_count; |
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// All nodes that are fused together are in a singly-linked list. |
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UPB_ATOMIC(upb_Arena*) next; // NULL at end of list. |
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// The last element of the linked list. This is present only as an |
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// optimization, so that we do not have to iterate over all members for every |
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// fuse. Only significant for an arena root. In other cases it is ignored. |
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UPB_ATOMIC(upb_Arena*) tail; // == self when no other list members. |
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// Linked list of blocks to free/cleanup. Atomic only for the benefit of |
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// upb_Arena_SpaceAllocated(). |
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UPB_ATOMIC(_upb_MemBlock*) blocks; |
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}; |
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// LINT.ThenChange(//depot/google3/third_party/upb/bits/typescript/arena.ts) |
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#include "upb/port/undef.inc" |
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#endif /* UPB_MEM_INTERNAL_ARENA_H_ */
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