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//! Syntax extensions in the Rust compiler.
#![doc(html_root_url = "https://doc.rust-lang.org/nightly/")]
#![deny(rust_2018_idioms)]
#![deny(unused_lifetimes)]
#![feature(in_band_lifetimes)]
#![feature(proc_macro_diagnostic)]
#![feature(proc_macro_internals)]
#![feature(proc_macro_span)]
#![feature(decl_macro)]
#![feature(nll)]
#![feature(rustc_diagnostic_macros)]
#![recursion_limit="256"]
extern crate proc_macro;
mod error_codes;
mod asm;
mod assert;
mod cfg;
mod compile_error;
mod concat;
mod concat_idents;
mod env;
mod format;
mod format_foreign;
mod global_asm;
mod log_syntax;
mod proc_macro_server;
mod test;
mod test_case;
mod trace_macros;
pub mod deriving;
pub mod proc_macro_decls;
pub mod proc_macro_impl;
use rustc_data_structures::sync::Lrc;
use syntax::ast;
use syntax::attr::Stability;
use syntax::ext::base::MacroExpanderFn;
use syntax::ext::base::{NamedSyntaxExtension, SyntaxExtension, SyntaxExtensionKind};
use syntax::edition::Edition;
use syntax::symbol::{sym, Symbol};
const EXPLAIN_ASM: &str =
"inline assembly is not stable enough for use and is subject to change";
const EXPLAIN_GLOBAL_ASM: &str =
"`global_asm!` is not stable enough for use and is subject to change";
const EXPLAIN_CUSTOM_TEST_FRAMEWORKS: &str =
"custom test frameworks are an unstable feature";
const EXPLAIN_LOG_SYNTAX: &str =
"`log_syntax!` is not stable enough for use and is subject to change";
const EXPLAIN_CONCAT_IDENTS: &str =
"`concat_idents` is not stable enough for use and is subject to change";
const EXPLAIN_FORMAT_ARGS_NL: &str =
"`format_args_nl` is only for internal language use and is subject to change";
const EXPLAIN_TRACE_MACROS: &str =
"`trace_macros` is not stable enough for use and is subject to change";
const EXPLAIN_UNSTABLE_COLUMN: &str =
"internal implementation detail of the `column` macro";
pub fn register_builtins(resolver: &mut dyn syntax::ext::base::Resolver,
user_exts: Vec<NamedSyntaxExtension>,
edition: Edition) {
deriving::register_builtin_derives(resolver, edition);
let mut register = |name, ext| {
resolver.add_builtin(ast::Ident::with_empty_ctxt(name), Lrc::new(ext));
};
macro_rules! register {
($( $name:ident: $f:expr, )*) => { $(
register(sym::$name, SyntaxExtension::default(
SyntaxExtensionKind::LegacyBang(Box::new($f as MacroExpanderFn)), edition
));
)* }
}
macro_rules! register_unstable {
($( [$feature:expr, $reason:expr, $issue:expr] $name:ident: $f:expr, )*) => { $(
register(sym::$name, SyntaxExtension {
stability: Some(Stability::unstable(
$feature, Some(Symbol::intern($reason)), $issue
)),
..SyntaxExtension::default(
SyntaxExtensionKind::LegacyBang(Box::new($f as MacroExpanderFn)), edition
)
});
)* }
}
use syntax::ext::source_util::*;
register! {
line: expand_line,
column: expand_column,
file: expand_file,
stringify: expand_stringify,
include: expand_include,
include_str: expand_include_str,
include_bytes: expand_include_bytes,
module_path: expand_mod,
cfg: cfg::expand_cfg,
concat: concat::expand_syntax_ext,
env: env::expand_env,
option_env: env::expand_option_env,
compile_error: compile_error::expand_compile_error,
assert: assert::expand_assert,
}
register_unstable! {
[sym::__rust_unstable_column, EXPLAIN_UNSTABLE_COLUMN, 0]
__rust_unstable_column: expand_column,
[sym::asm, EXPLAIN_ASM, 29722]
asm: asm::expand_asm,
[sym::global_asm, EXPLAIN_GLOBAL_ASM, 35119]
global_asm: global_asm::expand_global_asm,
[sym::concat_idents, EXPLAIN_CONCAT_IDENTS, 29599]
concat_idents: concat_idents::expand_syntax_ext,
[sym::log_syntax, EXPLAIN_LOG_SYNTAX, 29598]
log_syntax: log_syntax::expand_syntax_ext,
[sym::trace_macros, EXPLAIN_TRACE_MACROS, 29598]
trace_macros: trace_macros::expand_trace_macros,
}
let allow_internal_unstable = Some([sym::test, sym::rustc_attrs][..].into());
register(sym::test_case, SyntaxExtension {
stability: Some(Stability::unstable(
sym::custom_test_frameworks,
Some(Symbol::intern(EXPLAIN_CUSTOM_TEST_FRAMEWORKS)),
50297,
)),
allow_internal_unstable: allow_internal_unstable.clone(),
..SyntaxExtension::default(
SyntaxExtensionKind::LegacyAttr(Box::new(test_case::expand)), edition
)
});
register(sym::test, SyntaxExtension {
allow_internal_unstable: allow_internal_unstable.clone(),
..SyntaxExtension::default(
SyntaxExtensionKind::LegacyAttr(Box::new(test::expand_test)), edition
)
});
register(sym::bench, SyntaxExtension {
allow_internal_unstable,
..SyntaxExtension::default(
SyntaxExtensionKind::LegacyAttr(Box::new(test::expand_bench)), edition
)
});
let allow_internal_unstable = Some([sym::fmt_internals][..].into());
register(sym::format_args, SyntaxExtension {
allow_internal_unstable: allow_internal_unstable.clone(),
..SyntaxExtension::default(
SyntaxExtensionKind::LegacyBang(Box::new(format::expand_format_args)), edition
)
});
register(sym::format_args_nl, SyntaxExtension {
stability: Some(Stability::unstable(
sym::format_args_nl,
Some(Symbol::intern(EXPLAIN_FORMAT_ARGS_NL)),
0,
)),
allow_internal_unstable,
..SyntaxExtension::default(
SyntaxExtensionKind::LegacyBang(Box::new(format::expand_format_args_nl)), edition
)
});
for (name, ext) in user_exts {
register(name, ext);
}
}
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