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

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Fixed layering check violations once and for all in upb bootstrapping. Our bootstrapping setup compiles multiple versions of the generated code for `descriptor.proto` and `plugin.proto`, one for each stage of the bootstrap. For source files (`.c`), we can always select the correct version of the file in the BUILD rules, but for header files we need to make sure the correct stage's file is always selected via `#include`. Previously we used `cc_library(includes=[])` to make it appear as though our bootstrapped headers had the same names as the "real" headers. This allowed a lot of the code to be agnostic to whether a bootstrap header was being used, which simplified things because we did not have to change the code performing the `#include`. Unfortunately, due to build system limitations, this sometimes led to the incorrect header getting included. This should not have been possible, because we had a clean BUILD graph that should have removed all ambiguity about which header should be available. But in non-sandboxed builds, the compiler was able to find headers that were not actually in `deps=[]`, and worse it preferred those headers over the headers that actually were in `deps=[]`. This led to unintended results and errors about layering check violations. This CL fixes the problem by removing all use of `includes=[]`. We now spell a full pathname to all bootstrap headers, so this class of errors is no longer possible. Unfortunately this adds some complexity, as we have to hard-code these full paths in several places. A nice improvement in this CL is that `bootstrap_upb_proto_library()` can now only be used for bootstrapping; it only exposes the `descriptor_bootstrap.h` / `plugin_bootstrap.h` files. Anyone wanting to use the normal `net/proto2/proto/descriptor.upb.h` file should depend on `//net/proto2/proto:descriptor_upb_c_proto` target instead. PiperOrigin-RevId: 664953196
4 months ago
#ifndef THIRD_PARTY_UPB_UPB_GENERATOR_PLUGIN_BOOTSTRAP_H_
#define THIRD_PARTY_UPB_UPB_GENERATOR_PLUGIN_BOOTSTRAP_H_
// IWYU pragma: begin_exports
#if defined(UPB_BOOTSTRAP_STAGE) && UPB_BOOTSTRAP_STAGE == 0
// This header is checked in.
#include "upb_generator/stage0/google/protobuf/compiler/plugin.upb.h"
#elif UPB_BOOTSTRAP_STAGE == 1
// This header is generated at build time by the bootstrapping process.
#include "upb_generator/stage1/google/protobuf/compiler/plugin.upb.h"
#else
// This is the normal header, generated by upb_c_proto_library().
#include "google/protobuf/compiler/plugin.upb.h"
#endif
// IWYU pragma: end_exports
#endif // THIRD_PARTY_UPB_UPB_GENERATOR_PLUGIN_BOOTSTRAP_H_