Now that :minitable depends on :hash, we may as well put the extreg there also. PiperOrigin-RevId: 490620348pull/13171/head
Eric Salo
2 years ago
committed by
Copybara-Service
parent
9c6223c058
commit
4f098fd54c
8 changed files with 115 additions and 106 deletions
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/*
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* Copyright (c) 2009-2021, Google LLC |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions are met: |
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* * Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* * Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* * Neither the name of Google LLC nor the |
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* names of its contributors may be used to endorse or promote products |
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* derived from this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL Google LLC BE LIABLE FOR ANY DIRECT, |
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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#ifndef UPB_MINI_TABLE_EXTENSION_REGISTRY_H_ |
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#define UPB_MINI_TABLE_EXTENSION_REGISTRY_H_ |
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#include "upb/mem/arena.h" |
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#include "upb/mini_table/types.h" |
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// Must be last.
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#include "upb/port/def.inc" |
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#ifdef __cplusplus |
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extern "C" { |
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#endif |
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/* Extension registry: a dynamic data structure that stores a map of:
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* (upb_MiniTable, number) -> extension info |
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* |
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* upb_decode() uses upb_ExtensionRegistry to look up extensions while parsing |
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* binary format. |
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* |
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* upb_ExtensionRegistry is part of the mini-table (msglayout) family of |
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* objects. Like all mini-table objects, it is suitable for reflection-less |
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* builds that do not want to expose names into the binary. |
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* |
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* Unlike most mini-table types, upb_ExtensionRegistry requires dynamic memory |
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* allocation and dynamic initialization: |
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* * If reflection is being used, then upb_DefPool will construct an appropriate |
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* upb_ExtensionRegistry automatically. |
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* * For a mini-table only build, the user must manually construct the |
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* upb_ExtensionRegistry and populate it with all of the extensions the user |
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* cares about. |
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* * A third alternative is to manually unpack relevant extensions after the |
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* main parse is complete, similar to how Any works. This is perhaps the |
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* nicest solution from the perspective of reducing dependencies, avoiding |
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* dynamic memory allocation, and avoiding the need to parse uninteresting |
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* extensions. The downsides are: |
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* (1) parse errors are not caught during the main parse |
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* (2) the CPU hit of parsing comes during access, which could cause an |
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* undesirable stutter in application performance. |
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* |
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* Users cannot directly get or put into this map. Users can only add the |
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* extensions from a generated module and pass the extension registry to the |
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* binary decoder. |
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* |
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* A upb_DefPool provides a upb_ExtensionRegistry, so any users who use |
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* reflection do not need to populate a upb_ExtensionRegistry directly. |
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*/ |
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typedef struct upb_ExtensionRegistry upb_ExtensionRegistry; |
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// Creates a upb_ExtensionRegistry in the given arena.
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// The arena must outlive any use of the extreg.
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upb_ExtensionRegistry* upb_ExtensionRegistry_New(upb_Arena* arena); |
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// Adds the given extension info for the array |e| of size |count| into the
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// registry. If there are any errors, the entire array is backed out.
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// The extensions must outlive the registry.
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// Possible errors include OOM or an extension number that already exists.
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// TODO: There is currently no way to determine the exact reason for failure.
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bool upb_ExtensionRegistry_AddArray(upb_ExtensionRegistry* r, |
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const upb_MiniTableExtension** e, |
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size_t count); |
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// Looks up the extension (if any) defined for message type |t| and field
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// number |num|. Returns the extension if found, otherwise NULL.
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const upb_MiniTableExtension* upb_ExtensionRegistry_Lookup( |
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const upb_ExtensionRegistry* r, const upb_MiniTable* t, uint32_t num); |
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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_MINI_TABLE_EXTENSION_REGISTRY_H_ */ |
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