When generating headers from libraries that export functions as `extern "C"`
but still use namespaces (C-compatible C++ libraries), we want to generate
a Sandboxed API that includes fully-qualified namespace names as well.
In addition, we want the generated API to have the same source order as the
original library. Not only is this less surprising when reading the generated
code, it's also more accurate. Previously, we'd bundle all definitions in a
namespace and sort those alphabetically, but for code that relies on symbols
from another namespace to be available, generation will fail:
```c++
namespace zzz {
using entity_count_t = uint64_t;
} // namespace zzz
namespace sheep_counter {
using sheep_count_t = :💤:entity_count_t;
extern "C" void IncreaseSheepCounter(sheep_count_t increment);
} // namespace sheep_counter
```
PiperOrigin-RevId: 486586024
Change-Id: I419c9db8e9cb5b904364b353e2dc3d7f1030fab3
An `absl::StatusCode` of `kCancelled` now indicates warnings inside the emitter.
PiperOrigin-RevId: 485851898
Change-Id: I10a57cbc1b6c2d4b708c3c19aa0fa71451845a22
The libclang based header generator disallows functions that pass structs (or
more generally "record types") by value. While this can be implemented, the
such functions as emitted by the clang_generator never worked.
We should revisit this when we implement support for passing 128-bit integer
types directly, as those will work the same as small structs.
PiperOrigin-RevId: 485522603
Change-Id: Iae8284720da52496d7a48fe3ca3c3c8605e6d19d
This makes it easier to write tests with expected compilation/parsing failures.
PiperOrigin-RevId: 485331205
Change-Id: Ia545934849d38bded9320537c71e970fb4730cb6
Follow-up changes might be required to fully fix up the contrib sandboxes.
PiperOrigin-RevId: 482475998
Change-Id: Iff631eb838a024b2f047a1be61bb27e35a8ff2f4
When not requesting any particular function, `sapi_library()` will try and
make available _all_ functions it finds. In this case, system headers should
be skipped to avoid inflating the API surface. Standard library functions
can still be manually requested by adding them to the `functions` (Bazel)/
`FUNCTIONS` (CMake) argument.
PiperOrigin-RevId: 472272506
Change-Id: I8f8d79796d3044e598eebb7f87ce4cf464b47ed7
`BUILD_TESTING` is a CMake provided option and we should use similar naming,
just like how Abseil does it.
- `SAPI_ENABLE_TESTS` -> `SAPI_BUILD_TESTING`
- `SAPI_ENABLE_CONTRIB_TESTS` -> `SAPI_CONTRIB_BUILD_TESTING`
- `SAPI_ENABLE_EXAMPLES` -> `SAPI_BUILD_EXAMPLES`
Drive-by:
- Fix option name in GitHub action
PiperOrigin-RevId: 443305932
Change-Id: Ice2b42be1229a0f9ae7c2ceda9ce87187baf22c4
Including the `CTest` modules ensures that the `BUILD_TESTING` option is
defined and automatically calls `enable_testing()` if needed. It does not
change the default or introduce any dependencies on its own.
This follows what Abseil already does in their top-level `CMakeLists.txt`.
PiperOrigin-RevId: 443305646
Change-Id: If067c17470f497437c7748aab4aab5227c26e84f
The corresponding command-line option `sapi_isystem` will be ignored for
compatibility.
PiperOrigin-RevId: 439806387
Change-Id: I8ad6d7feed2fba5fca9940281f03cfc757ada5be
This change introduces an experimental `generator_version` attribute to the
`sapi_library()` rule. Version `1` will select the current interface
generator, which is based on libclang and Python. Setting the attribute to
version `2`, will select the newer interface generator written in C++ that
uses a full clang compiler frontend for parsing. Both emit equivalent header
output, differences in parsing and/or edge cases notwithstanding.
The default, as of now, is still the old version `1` generator.
Note: CMake allows to select the new interface generator globally by setting
`SAPI_ENABLE_GENERATOR`.
PiperOrigin-RevId: 438765013
Change-Id: I69c49a6bcf1751724edb0bce5c3b2beea2097138
This adds a workspace rule that inspects the current system first and
downloads a suitable version of LLVM/Clang from GitHub if it can't
find one. In the latter case, the necessary parts are build from source,
which can take a while (~10-15m, depending on the build machine).
In order to be found, LLVM/Clang system libraries must be version 11
or higher. On Debian/Ubuntu, install `llvm-13-dev` and `libclang-13-dev`.
The new `llvm_config.bzl` implements this logic. It is loosely based on
upstream's https://github.com/llvm/llvm-project/blob/main/utils/bazel/configure.bzl.
Note that due to the way Bazel separates local repositories, we have to
duplictate some of this code.
PiperOrigin-RevId: 438759950
Change-Id: Ia65f473b4cdef6507e3816bf09794ea10963d87a
This uses the Google formatting style to format the prototype comments, with an
internal line length of 75, which accomodates the indentation in the generated
API class.
PiperOrigin-RevId: 435303665
Change-Id: I4dcdf0ed773a79ebc55ead3843f07ca8556fd985
This implements a custom compilation database to conditionally add the correct
language flags to the compiler frontend. Otherwise, a C header might receive
`--std=c++17` and fail.
Note: All headers are always processed in C++ mode. We expect that headers of
well-behaved C libraries contain `#ifdef __cplusplus`/`extern "C" {}` guards.
PiperOrigin-RevId: 435302048
Change-Id: Ib84e6e1f301ba434999846a012b3f8c16884648e
The enclosing type is enough to reconstruct the AST when writing the header and this
change avoids emitting the same struct twice.
PiperOrigin-RevId: 435300029
Change-Id: I34bd660db5ba5c68b64cce73ecf2f026727ac57b
This is a follow up to fa9e6e8a5c.
Drive-by:
- Replace deprecated calls to `getNameAsString()`
PiperOrigin-RevId: 435287759
Change-Id: I81d8c2f93b1ab23c781421b114779b7a241e4a7e
There are a lot of internal users depending on the old behavior of the
libclang-based generator.
PiperOrigin-RevId: 432281224
Change-Id: If82333fc3001f52de59e57a874f28bf8815d0877
Raw `SAPI_RAW_PCHECK` may dump core, depending on environment settings
(issue #89).
This is undesirable in the face of invalid command-line arguments.
Signed-off-by: Christian Blichmann <cblichmann@google.com>
Only externally visible changes should be a few changed includes as well as
some formatting changes.
PiperOrigin-RevId: 353226662
Change-Id: Iebf5be13774efcbd94c5d5a17b9b27e47275b229
This change should make it less confusing where utility code comes from.
Having it in two places made sense when we were debating whether to publish
Sandbox2 separately, but not any longer.
Follow-up changes will move `sandbox2/util.h` and rename the remaining
`sandbox2/util` folder.
PiperOrigin-RevId: 351601640
Change-Id: I6256845261f610e590c25e2c59851cc51da2d778
This also allows to install `libclang1` instead of `libclang1-dev` as
one of the build dependencies on Ubuntu/Debian.
Signed-off-by: Christian Blichmann <cblichmann@google.com>
- Ubuntu 18.04 ships with GCC 7, which needs `std::move()` when returning an `absl::StatusOr<>`
- Ignore C++ AST nodes of type `cindex.TypeKind.UNEXPOSED` in Python generator
- Remove default values in `ubuntu-cmake.yml`
PiperOrigin-RevId: 347605109
Change-Id: Ibe167249ecf4ef1af1654d63c2e067fc02e5782d
This allows resource-constrained environments to benefit from the
space savings of dynamic linking. This is not meant to be used in
the general case.
PiperOrigin-RevId: 347398828
Change-Id: Ia634959148a31159878f48c44255dd733424a2b8
This change allows us to emit forward declarations to classes that are
templated. For headers generated by the proto compiler this is sometimes
necessary.
Note:
- This will only emit types for a single level of template instantiations.
That is, template template arguments are not supported.
- Typedefs only occurring in template arguments will be fully desugared
and thus will not be available under their aliased name in the generated
API code. This is consistent with the Python based generator (which
does not emit these at all and relies on text extraction).
Signed-off-by: Christian Blichmann <cblichmann@google.com>
