Protocol Buffers - Google's data interchange format (grpc依赖)
https://developers.google.com/protocol-buffers/
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80 lines
2.6 KiB
80 lines
2.6 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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/* upb_Arena is a specific allocator implementation that uses arena allocation. |
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* The user provides an allocator that will be used to allocate the underlying |
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* arena blocks. Arenas by nature do not require the individual allocations |
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* to be freed. However the Arena does allow users to register cleanup |
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* functions that will run when the arena is destroyed. |
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* |
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* A upb_Arena is *not* thread-safe. |
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* |
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* You could write a thread-safe arena allocator that satisfies the |
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* upb_alloc interface, but it would not be as efficient for the |
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* single-threaded case. */ |
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#ifndef UPB_MEM_ARENA_H_ |
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#define UPB_MEM_ARENA_H_ |
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#include <stddef.h> |
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#include <stdint.h> |
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#include "upb/mem/alloc.h" |
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#include "upb/mem/internal/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_Arena upb_Arena; |
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#ifdef __cplusplus |
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extern "C" { |
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#endif |
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// Creates an arena from the given initial block (if any -- n may be 0). |
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// Additional blocks will be allocated from |alloc|. If |alloc| is NULL, this |
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// is a fixed-size arena and cannot grow. |
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UPB_API upb_Arena* upb_Arena_Init(void* mem, size_t n, upb_alloc* alloc); |
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UPB_API void upb_Arena_Free(upb_Arena* a); |
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UPB_API bool upb_Arena_Fuse(upb_Arena* a, upb_Arena* b); |
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bool upb_Arena_IncRefFor(upb_Arena* a, const void* owner); |
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void upb_Arena_DecRefFor(upb_Arena* a, const void* owner); |
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size_t upb_Arena_SpaceAllocated(upb_Arena* a); |
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uint32_t upb_Arena_DebugRefCount(upb_Arena* a); |
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UPB_API_INLINE upb_Arena* upb_Arena_New(void) { |
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return upb_Arena_Init(NULL, 0, &upb_alloc_global); |
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} |
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UPB_API_INLINE void* upb_Arena_Malloc(struct upb_Arena* a, size_t size) { |
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return UPB_PRIVATE(_upb_Arena_Malloc)(a, size); |
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} |
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UPB_API_INLINE void* upb_Arena_Realloc(upb_Arena* a, void* ptr, size_t oldsize, |
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size_t size) { |
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return UPB_PRIVATE(_upb_Arena_Realloc)(a, ptr, oldsize, size); |
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} |
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// Shrinks the last alloc from arena. |
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// REQUIRES: (ptr, oldsize) was the last malloc/realloc from this arena. |
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// We could also add a upb_Arena_TryShrinkLast() which is simply a no-op if |
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// this was not the last alloc. |
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UPB_API_INLINE void upb_Arena_ShrinkLast(upb_Arena* a, void* ptr, |
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size_t oldsize, size_t size) { |
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UPB_PRIVATE(_upb_Arena_ShrinkLast)(a, ptr, oldsize, size); |
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} |
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#ifdef __cplusplus |
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} /* extern "C" */ |
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#endif |
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#include "upb/port/undef.inc" |
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#endif /* UPB_MEM_ARENA_H_ */
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