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Shuffle around the wiggle crates (#1414)

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* Shuffle around the wiggle crates

This commit reorganizes the wiggle crates slightly by performing the
following transforms:

* The `crates/wiggle` crate, previously named `wiggle`, was moved to
  `crates/wiggle/crates/macro` and is renamed to `wiggle-macro`.

* The `crates/wiggle/crates/runtime` crate, previously named
  `wiggle-runtime`, was moved to `crates/wiggle` and is renamed to
  `wiggle`.

* The new `wiggle` crate depends on `wiggle-macro` and reexports the macro.

The goal here is that consumers only deal with the `wiggle` crate
itself. No more crates depend on `wiggle-runtime` and all dependencies
are entirely on just the `wiggle` crate.

* Remove the `crates/wiggle/crates` directory

Move everything into `crates/wiggle` directly, like `wasi-common`

* Add wiggle-macro to test-all script

* Fixup a test
This commit is contained in:
Alex Crichton
2020-03-26 18:34:50 -05:00
committed by GitHub
parent 6fa9be7767
commit a628dc315e
47 changed files with 802 additions and 800 deletions
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26
crates/wiggle/macro/Cargo.toml Normal file
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[package]
name = "wiggle-macro"
version = "0.13.0"
authors = ["Pat Hickey <phickey@fastly.com>", "Jakub Konka <kubkon@jakubkonka.com>", "Alex Crichton <alex@alexcrichton.com>"]
edition = "2018"
license = "Apache-2.0 WITH LLVM-exception"
description = "Wiggle code generator"
categories = ["wasm"]
keywords = ["webassembly", "wasm"]
repository = "https://github.com/bytecodealliance/wasmtime"
readme = "README.md"
include = ["src/**/*", "LICENSE"]
[lib]
proc-macro = true
[dependencies]
wiggle-generate = { path = "../generate", version = "0.13.0" }
witx = { path = "../../wasi-common/wig/WASI/tools/witx", version = "0.8.4" }
syn = { version = "1.0", features = ["full"] }
[dev-dependencies]
wiggle = { path = ".." }
[features]
wiggle_metadata = []

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crates/wiggle/macro/LICENSE Normal file
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crates/wiggle/macro/src/lib.rs Normal file
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extern crate proc_macro;
use proc_macro::TokenStream;
use syn::parse_macro_input;
/// This macro expands to a set of `pub` Rust modules:
///
/// * The `types` module contains definitions for each `typename` declared in
/// the witx document. Type names are translated to the Rust-idiomatic
/// CamelCase.
///
/// * For each `module` defined in the witx document, a Rust module is defined
/// containing definitions for that module. Module names are teanslated to the
/// Rust-idiomatic snake\_case.
///
/// * For each `@interface func` defined in a witx module, an abi-level
/// function is generated which takes ABI-level arguments, along with a
/// "context" struct (whose type is given by the `ctx` field in the
/// macro invocation) and a `GuestMemory` implementation.
///
/// * A public "module trait" is defined (called the module name, in
/// SnakeCase) which has a `&self` method for each function in the
/// module. These methods takes idiomatic Rust types for each argument
/// and return `Result<($return_types),$error_type>`
///
/// Arguments are provided using Rust struct value syntax.
///
/// * `witx` takes a list of string literal paths. Paths are relative to the
/// CARGO_MANIFEST_DIR of the crate where the macro is invoked.
/// * `ctx` takes a type name. This type must implement all of the module
/// traits
///
/// ## Example
///
/// ```
/// use wiggle::{GuestPtr, GuestErrorType};
///
/// /// The test witx file `arrays.witx` lives in the test directory. For a
/// /// full-fledged example with runtime tests, see `tests/arrays.rs` and
/// /// the rest of the files in that directory.
/// wiggle::from_witx!({
/// witx: ["../tests/arrays.witx"],
/// ctx: YourCtxType,
/// });
///
/// /// The `ctx` type for this wiggle invocation.
/// pub struct YourCtxType {}
///
/// /// `arrays.witx` contains one module called `arrays`. So, we must
/// /// implement this one method trait for our ctx type:
/// impl arrays::Arrays for YourCtxType {
/// /// The arrays module has two methods, shown here.
/// /// Note that the `GuestPtr` type comes from `wiggle`,
/// /// whereas the witx-defined types like `Excuse` and `Errno` come
/// /// from the `pub mod types` emitted by the `wiggle::from_witx!`
/// /// invocation above.
/// fn reduce_excuses(&self, _a: &GuestPtr<[GuestPtr<types::Excuse>]>)
/// -> Result<types::Excuse, types::Errno> {
/// unimplemented!()
/// }
/// fn populate_excuses(&self, _a: &GuestPtr<[GuestPtr<types::Excuse>]>)
/// -> Result<(), types::Errno> {
/// unimplemented!()
/// }
/// }
///
/// /// For all types used in the `Error` position of a `Result` in the module
/// /// traits, you must implement `GuestErrorType` which tells wiggle-generated
/// /// code how to determine if a method call has been successful, as well as
/// /// how to translate a wiggle runtime error into an ABI-level error.
/// impl<'a> GuestErrorType<'a> for types::Errno {
/// type Context = YourCtxType;
/// fn success() -> Self {
/// unimplemented!()
/// }
/// fn from_error(_e: wiggle::GuestError, _c: &Self::Context) -> Self {
/// unimplemented!()
/// }
/// }
///
/// # fn main() { println!("this fools doc tests into compiling the above outside a function body")
/// # }
/// ```
#[proc_macro]
pub fn from_witx(args: TokenStream) -> TokenStream {
let mut config = parse_macro_input!(args as wiggle_generate::Config);
config.witx.make_paths_relative_to(
std::env::var("CARGO_MANIFEST_DIR").expect("CARGO_MANIFEST_DIR env var"),
);
#[cfg(feature = "wiggle_metadata")]
{
config.emit_metadata = true;
}
let doc = witx::load(&config.witx.paths).expect("loading witx");
TokenStream::from(wiggle_generate::generate(&doc, &config))
}