protobuf

Protocol Buffers - Google's data interchange format (grpc依赖) https://developers.google.com/protocol-buffers/

Joshua Haberman d22d6d71ed Refactored message accessors to share a common set of functions instead of duplicating logic. Prior to this CL, there were several different code paths for reading/writing message data. Generated code, MiniTable accessors, and reflection all performed direct manipulation of the bits and bytes in a message, but they all had distinct implementations that did not share much of any code. This divergence meant that they could easily have different behavior, bugs could creep into one but not another, and we would need three different sets of tests to get full test coverage. This also made it very difficult to change the internal representation in any way, since it would require updating many places in the code. With this CL, the three different APIs for accessing message data now all share a common set of functions. The common functions all take a `upb_MiniTableField` as the canonical description of a field's type and layout. The lowest-level functions are very branchy, as they must test for every possible variation in the field type (field vs oneof, hasbit vs no-hasbit, different field sizes, whether a nonzero default value exists, extension vs. regular field), however these functions are declared inline and designed to be very optimizable when values are known at compile time. In generated accessors, for example, we can declare constant `upb_MiniTableField` instances so that all values can constant-propagate, and we can get fully specialized code even though we are calling a generic function. On the other hand, when we use the generic functions from reflection, we get runtime branches since values are not known at compile time. But even the function is written to still be as efficient as possible even when used from reflection. For example, we use memcpy() calls with constant length so that the compiler can optimize these into inline loads/stores without having to make an out-of-line call to memcpy(). In this way, this CL should be a benefit to both correctness and performance. It will also make it easier to change the message representation, for example to optimize the encoder by giving hasbits to all fields. Note that we have not completely consolidated all access in this CL: 1. Some functions outside of get/set such as clear and hazzers are not yet unified. 2. The encoder and decoder still touch the message without going through the common functions. The encoder and decoder require a bit more specialized code to get good performance when reading/writing fields en masse. PiperOrigin-RevId: 490016095		2 years ago
..
base	move the wire type definitions into upb/wire/ where they belong	2 years ago
collections	fix --config=lexan builds that were broken by cl/489989481	2 years ago
fuzz	Fixed clang-format.	3 years ago
hash	replace and repair the integer hash table iterator:	2 years ago
io	consolidate some general parsing functions into upb/lex/	2 years ago
json	implement upb_Map_Next() as the new upb_Map iterator	2 years ago
lex	consolidate some general parsing functions into upb/lex/	2 years ago
mem	clean up the arena code a bit more:	2 years ago
message	Refactored message accessors to share a common set of functions instead of duplicating logic.	2 years ago
mini_table	Refactored message accessors to share a common set of functions instead of duplicating logic.	2 years ago
port	Refactored message accessors to share a common set of functions instead of duplicating logic.	2 years ago
reflection	Refactored message accessors to share a common set of functions instead of duplicating logic.	2 years ago
text	implement upb_Map_Next() as the new upb_Map iterator	2 years ago
util	implement upb_Map_Next() as the new upb_Map iterator	2 years ago
wire	Refactored message accessors to share a common set of functions instead of duplicating logic.	2 years ago
alloc.h	create mem/ subdir for all arena code	2 years ago
arena.h	create mem/ subdir for all arena code	2 years ago
array.h	create collections/ subdir for all array and map code	2 years ago
collections.h	create collections/ subdir for all array and map code	2 years ago
conformance_upb.c	move portability stuff into upb/port/	2 years ago
conformance_upb_failures.txt	Copybara import of the project:	2 years ago
decode.h	create wire/ subdir for all wire-format code	2 years ago
decode_fast.h	create wire/ subdir for all wire-format code	2 years ago
def.h	- All of reflection now lives in upb/reflection/	2 years ago
def.hpp	- All of reflection now lives in upb/reflection/	2 years ago
empty.proto	Internal change	3 years ago
encode.h	create wire/ subdir for all wire-format code	2 years ago
extension_registry.c	clean up the :mini_table build target	2 years ago
extension_registry.h	clean up the :mini_table build target	2 years ago
fuzz_test_util.cc	clean up the :mini_table build target	2 years ago
fuzz_test_util.h	clean up the :mini_table build target	2 years ago
json_decode.h	move (most of) the json code into its own subdir	2 years ago
json_encode.h	move (most of) the json code into its own subdir	2 years ago
map.h	create collections/ subdir for all array and map code	2 years ago
mini_table.h	remove upb_MtDataEncoder from the public surface	2 years ago
msg.h	clean up the :mini_table build target	2 years ago
msg_internal.h	clean up the :mini_table build target	2 years ago
proto3_test.cc	stop requiring extension fields to have a synthetic oneof	2 years ago
proto3_test.proto	stop requiring extension fields to have a synthetic oneof	2 years ago
reflection.h	- All of reflection now lives in upb/reflection/	2 years ago
reflection.hpp	- All of reflection now lives in upb/reflection/	2 years ago
status.h	create base/ subdir and expand :status build target to :base	2 years ago
string_view.h	create base/ subdir and expand :status build target to :base	2 years ago
test.proto	Add upb_Message_DeleteUnknown API.	2 years ago
test_cpp.cc	create base/ subdir and expand :status build target to :base	2 years ago
test_cpp.proto	Moved tests into the main source tree.	3 years ago
test_generated_code.cc	move portability stuff into upb/port/	2 years ago
text_encode.h	create text/ subdir for all text-format code	2 years ago
upb.h	create base/ subdir and expand :status build target to :base	2 years ago
upb.hpp	clean up the arena code a bit more:	2 years ago