Crate names must not contain '-'. So we replace any '-' by a '_' to form a valid crate name.
Bazel supports many special characters as target names: !%-@^_"#$&'()*-+,;<=>?[]{|}~/. We don't have to support all of them in Protobuf Rust, but '-' seems used widely enough and is a common alternative to '_' in naming.
PiperOrigin-RevId: 602963206
Before this change if a field type was defined in a imported .proto file then our codegen would not generate the field. After this change such fields are correctly generated (see tests). This change is rather trivial as all the supporting infra has been implemented as part of the .proto -> crate mapping CLs.
PiperOrigin-RevId: 601443383
To satisfy the layering check, we need to depend on :gtest for the headers, in
addition to :gtest_main which provides the main() function.
There are a bunch of formatting changes as a side effect of this, but they
should be harmless.
PiperOrigin-RevId: 594318263
This CL implements Maps for scalar types for the C++ runtime. It's orthogonal to cl/580453646. This CL is constrained by having to force template instantiation of proto2::Map<K, V>. Put differently, a Rust protobuf::Map<K, V> implementation needs to call 'extern "C"' functions with both key and value type in the function name (e.g. __pb_rust_Map_i32_f64_get()). We use macros to generate a Map implementation for every (K,V)-pair. An alternative would have been to use vtables.
Luckily a key in a protobuf map can only be integer types, bool and string. So the number of key types is bounded by the specification, while the number of value types is not i.e. any protobuf message can be a value in a map. Given these constraints we introduce one 'MapKeyOps' trait per key type e.g. MapKeyBOOLOps or MapKeyI32Ops. These traits need to be implemented for every value type e.g. 'impl MapKeyBOOLOps for i32' will implement 'Map::<bool, i32>'. In particular the MapKeyOps traits can also be implemented for generated messages without violating the orphan rule.
This CL also contains significant changes to the UPB runtime so that both upb.rs and cpp.rs export a similar interface to simplify the implementation in map.rs and the generated code.
This CL does not yet implement the Proxied trait.
PiperOrigin-RevId: 582951914
This makes a few changes:
- It changes generated messages to reference message innards as a type in `__runtime` instead of branching on what fields should be there. That results in much less bifurcation in gencode and lets runtime-agnostic code reference raw message innards.
- It adds a generic mechanism for creating vtable-based mutators. These vtables point to thunks generated for interacting with C++ or upb fields. Right now, the design results in 2-word (msg+vtable) mutators for C++ and 3-word mutators (msg+arena+vtable) for UPB. See upb.rs for an explanation of the design options. I chose the `RawMessage+&Arena` design for mutator data as opposed to a `&MessageInner` design because it did not result in extra-indirection layout changes for message mutators. We could revisit this in the future with performance data, since this results in all field mutators being 3 words large instead of the register-friendly 2 words.
- And lastly, as a nearby change that touches on many of the same topics, it adds some extra SAFETY comments for Send/Sync in message gencode.
PiperOrigin-RevId: 559483437
Only emit has_field() if the field support presence. Only emit field_opt() getter if the field is both optional and supports presence.
PiperOrigin-RevId: 555133374
If a proto_library has more than one srcs, we designate the first one as the primary (that file will be passed to rustc as the crate root). All other files will represent (internal) submodules of the crate.
In general, Rust users won't see which .proto file a message came from, they will only see a crate corresponding to the entire proto_library, and in it public submodules for all `package` statements in all .proto files in the proto_library sources. Therefore in this CL we reexport all messages from non primary sources into their corresponding public modules (= packages declared in their owning .proto files).
Besides the common case this CL also handles .proto files without package statement, and a subset of behaviors needed for public import functionality.
PiperOrigin-RevId: 549543321
Before this CL all messages were generated in the top-level crate module. With
this change we generate messages under the module specified by the package
declaration in the .proto file.
Dots are interpreted as submodule separator in consistency with how C++
namespaces are handled.
Note that name of the proto_library target still remains to be used as the crate name. This CL only adds crate submodules dependeing on the specified package.
PiperOrigin-RevId: 524235162
In this CL I'd like to call existing C++ Protobuf API from the V0 Rust API. Since parts of the C++ API are defined inline and using (obviously) C++ name mangling, we need to create a "thunks.cc" file that:
1) Generates code for C++ API function we use from Rust
2) Exposes these functions without any name mangling (meaning using `extern "C"`)
In this CL we add Bazel logic to generate "thunks" file, compile it, and propagate its object to linking. We also add logic to protoc to generate this "thunks" file.
The protoc logic is rather rudimentary still. I hope to focus on protoc code quality in my followup work on V0 Rust API using C++ kernel.
PiperOrigin-RevId: 523479839
This turns out to be quite of a yak shave to be able to perfectly test both kernels without having to pass extra Blaze flags.
PiperOrigin-RevId: 521850709
In this CL we're adding the barebones infrastructure to generate Rust proto messages using UPB as a backend. The API is what we call a V0, not yet production-quality, not yet rigorously designed, just something to enable parallel work.
The interesting part of switching backend between UPB and C++ will come in a followup.
PiperOrigin-RevId: 517089760
The internal design is consistent with other <lang>_proto_library rules. rust_proto_library attaches rust_proto_library_aspect on its `deps` attribute. The aspect traverses the dependency, and when it visits proto_library (detected by ProtoInfo provider) it registers 2 actions:
1) to run protoc with Rust backend to emit gencode
2) to compile the gencode using Rustc
Action (2) gets the Rust proto runtime as an input as well.
Coming in a followup is support and test coverage for proto_library.deps.
PiperOrigin-RevId: 514521285
