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https://github.com/italicsjenga/agb.git
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Add a simple entrypoint macro
This commit is contained in:
Gwilym Kuiper
parent
b1516a07ab
commit
e6447cb08f
123
agb-entrypoint/Cargo.lock
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123
agb-entrypoint/Cargo.lock
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# This file is automatically @generated by Cargo.
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# It is not intended for manual editing.
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version = 3
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[[package]]
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name = "agb-entrypoint"
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version = "0.6.0"
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dependencies = [
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"proc-macro2",
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"quote",
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"rand",
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"syn",
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]
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[[package]]
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name = "cfg-if"
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version = "1.0.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
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[[package]]
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name = "getrandom"
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version = "0.2.3"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "7fcd999463524c52659517fe2cea98493cfe485d10565e7b0fb07dbba7ad2753"
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dependencies = [
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"cfg-if",
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"libc",
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"wasi",
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]
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[[package]]
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name = "libc"
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version = "0.2.98"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "320cfe77175da3a483efed4bc0adc1968ca050b098ce4f2f1c13a56626128790"
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[[package]]
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name = "ppv-lite86"
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version = "0.2.10"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "ac74c624d6b2d21f425f752262f42188365d7b8ff1aff74c82e45136510a4857"
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[[package]]
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name = "proc-macro2"
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version = "1.0.28"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "5c7ed8b8c7b886ea3ed7dde405212185f423ab44682667c8c6dd14aa1d9f6612"
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dependencies = [
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"unicode-xid",
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]
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[[package]]
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name = "quote"
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version = "1.0.9"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "c3d0b9745dc2debf507c8422de05d7226cc1f0644216dfdfead988f9b1ab32a7"
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dependencies = [
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"proc-macro2",
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]
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[[package]]
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name = "rand"
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version = "0.8.4"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "2e7573632e6454cf6b99d7aac4ccca54be06da05aca2ef7423d22d27d4d4bcd8"
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dependencies = [
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"libc",
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"rand_chacha",
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"rand_core",
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"rand_hc",
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]
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[[package]]
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name = "rand_chacha"
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version = "0.3.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
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dependencies = [
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"ppv-lite86",
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"rand_core",
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]
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[[package]]
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name = "rand_core"
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version = "0.6.3"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "d34f1408f55294453790c48b2f1ebbb1c5b4b7563eb1f418bcfcfdbb06ebb4e7"
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dependencies = [
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"getrandom",
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]
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[[package]]
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name = "rand_hc"
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version = "0.3.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "d51e9f596de227fda2ea6c84607f5558e196eeaf43c986b724ba4fb8fdf497e7"
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dependencies = [
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"rand_core",
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]
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[[package]]
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name = "syn"
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version = "1.0.74"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "1873d832550d4588c3dbc20f01361ab00bfe741048f71e3fecf145a7cc18b29c"
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dependencies = [
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"proc-macro2",
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"quote",
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"unicode-xid",
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]
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[[package]]
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name = "unicode-xid"
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version = "0.2.2"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "8ccb82d61f80a663efe1f787a51b16b5a51e3314d6ac365b08639f52387b33f3"
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[[package]]
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name = "wasi"
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version = "0.10.2+wasi-snapshot-preview1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "fd6fbd9a79829dd1ad0cc20627bf1ed606756a7f77edff7b66b7064f9cb327c6"
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16
agb-entrypoint/Cargo.toml
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16
agb-entrypoint/Cargo.toml
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@ -0,0 +1,16 @@
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[package]
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name = "agb-entrypoint"
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version = "0.6.0"
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authors = ["Gwilym Kuiper <gw@ilym.me>"]
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edition = "2018"
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license = "MPL-2.0"
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description = "Macro for declaring the entrypoint for a game using the agb library"
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[lib]
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proc-macro = true
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[dependencies]
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syn = { version = "1.0.73", features = ["full", "extra-traits"] }
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proc-macro2 = "1.0.27"
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quote = "1.0.9"
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rand = "0.8.4"
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60
agb-entrypoint/src/lib.rs
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60
agb-entrypoint/src/lib.rs
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// This macro is based very heavily on the entry one in rust-embedded
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use proc_macro::TokenStream;
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use proc_macro2::Span;
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use quote::quote;
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use syn::{ItemFn, ReturnType, Type, Visibility, Ident};
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use rand;
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use rand::Rng;
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#[proc_macro_attribute]
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pub fn entry(args: TokenStream, input: TokenStream) -> TokenStream {
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let f: ItemFn = syn::parse(input).expect("#[agb::entry] must be applied to a function");
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// Check that the function signature is correct
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assert!(
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f.sig.constness.is_none()
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&& f.vis == Visibility::Inherited
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&& f.sig.abi.is_none()
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&& f.sig.inputs.is_empty()
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&& f.sig.generics.params.is_empty()
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&& f.sig.generics.where_clause.is_none()
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&& match f.sig.output {
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ReturnType::Type(_, ref ty) => match **ty {
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Type::Never(_) => true,
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_ => false,
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},
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_ => false,
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},
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"#[agb::entry] must have signature [unsafe] fn () -> !"
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);
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assert!(args.to_string() == "", "Must pass no args to entrypoint");
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let fn_name = random_ident();
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let attrs = f.attrs;
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let stmts = f.block.stmts;
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quote!(
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#[export_name = "main"]
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#(#attrs)*
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pub fn #fn_name() -> ! {
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#(#stmts)*
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}
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).into()
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}
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fn random_ident() -> Ident {
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let mut rng = rand::thread_rng();
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Ident::new(
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&(0..16).map(|i| {
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if i == 0 || rng.gen() {
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('a' as u8 + rng.gen::<u8>() % 25) as char
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} else {
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('0' as u8 + rng.gen::<u8>() % 10) as char
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}
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}).collect::<String>(),
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Span::call_site()
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)
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}
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