5953215bac
* Auto-generate shims for old `wasi_unstable` module This commit is effectively just doing what #707 already did, but applying it to the `snapshot_0` module as well. The end result is the same, where we cut down on all the boilerplate in `snapshot_0` and bring it in line with the main `wasi_snapshot_preview1` implementation. The goal here is to make it easier to change the two in tandem since they're both doing the same thing. * Migrate `wasi_common::hostcalls` to a macro This commit migrates the `hostcalls` module to being auto-generated by a macro rather than duplicating a handwritten signature for each wasi syscall. * Auto-generate snapshot_0's `hostcalls` module Similar to the previous commit, but for `snapshot_0` * Delete the `wasi-common-cbindgen` crate This is no longer needed with the hostcalls macro now, we can easily fold the definition of the cbindgen macro into the same crate. * Rustfmt * Fix windows build errors * Rustfmt * Remove now no-longer-necessary code * rustfmt
66 lines
1.8 KiB
Rust
66 lines
1.8 KiB
Rust
use proc_macro2::{Ident, Literal, TokenStream, TokenTree};
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/// Given the input tokens to a macro invocation, return the path to the
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/// witx file to process.
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pub(crate) fn witx_path_from_args(args: TokenStream) -> (String, String) {
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let mut strings = Vec::new();
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for arg in args {
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if let TokenTree::Literal(literal) = arg {
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let parsed = parse_string_literal(literal);
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strings.push(parsed);
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} else {
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panic!("arguments must be string literals");
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}
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}
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if strings.len() != 2 {
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panic!("expected two string literals");
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}
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let phase = &strings[0];
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let id = &strings[1];
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let path = witx_path(phase, id);
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(path, phase.clone())
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}
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fn witx_path(phase: &str, id: &str) -> String {
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let root = env!("CARGO_MANIFEST_DIR");
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format!("{}/WASI/phases/{}/witx/{}.witx", root, phase, id)
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}
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// Convert a `Literal` holding a string literal into the `String`.
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//
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// FIXME: It feels like there should be an easier way to do this.
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fn parse_string_literal(literal: Literal) -> String {
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let s = literal.to_string();
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assert!(
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s.starts_with('"') && s.ends_with('"'),
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"string literal must be enclosed in double-quotes"
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);
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let trimmed = s[1..s.len() - 1].to_owned();
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assert!(
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!trimmed.contains('"'),
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"string literal must not contain embedded quotes for now"
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);
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assert!(
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!trimmed.contains('\\'),
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"string literal must not contain embedded backslashes for now"
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);
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trimmed
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}
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pub fn param_name(param: &witx::InterfaceFuncParam) -> Ident {
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quote::format_ident!(
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"{}",
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match param.name.as_str() {
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"in" | "type" => format!("r#{}", param.name.as_str()),
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s => s.to_string(),
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}
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)
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}
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