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#![feature(rustc_private)]
// NOTE: For the example to compile, you will need to first run the following:
// rustup component add rustc-dev
extern crate rustc;
extern crate rustc_error_codes;
extern crate rustc_errors;
extern crate rustc_hash;
extern crate rustc_hir;
extern crate rustc_interface;
extern crate rustc_session;
extern crate rustc_span;
use rustc_errors::registry;
use rustc_hash::{FxHashMap, FxHashSet};
use rustc_session::config;
use rustc_span::source_map;
use std::path;
use std::process;
use std::str;
fn main() {
let out = process::Command::new("rustc")
.arg("--print=sysroot")
.current_dir(".")
.output()
.unwrap();
let sysroot = str::from_utf8(&out.stdout).unwrap().trim();
let config = rustc_interface::Config {
// Command line options
opts: config::Options {
maybe_sysroot: Some(path::PathBuf::from(sysroot)),
..config::Options::default()
},
// cfg! configuration in addition to the default ones
crate_cfg: FxHashSet::default(), // FxHashSet<(String, Option<String>)>
input: config::Input::Str {
name: source_map::FileName::Custom("main.rs".to_string()),
input: "static HELLO: &str = \"Hello, world!\"; fn main() { println!(\"{}\", HELLO); }"
.to_string(),
},
input_path: None, // Option<PathBuf>
output_dir: None, // Option<PathBuf>
output_file: None, // Option<PathBuf>
file_loader: None, // Option<Box<dyn FileLoader + Send + Sync>>
diagnostic_output: rustc_session::DiagnosticOutput::Default,
// Set to capture stderr output during compiler execution
stderr: None, // Option<Arc<Mutex<Vec<u8>>>>
crate_name: None, // Option<String>
lint_caps: FxHashMap::default(), // FxHashMap<lint::LintId, lint::Level>
// This is a callback from the driver that is called when we're registering lints;
// it is called during plugin registration when we have the LintStore in a non-shared state.
//
// Note that if you find a Some here you probably want to call that function in the new
// function being registered.
register_lints: None, // Option<Box<dyn Fn(&Session, &mut LintStore) + Send + Sync>>
// This is a callback from the driver that is called just after we have populated
// the list of queries.
//
// The second parameter is local providers and the third parameter is external providers.
override_queries: None, // Option<fn(&Session, &mut ty::query::Providers<'_>, &mut ty::query::Providers<'_>)>
// Registry of diagnostics codes.
registry: registry::Registry::new(&rustc_error_codes::DIAGNOSTICS),
};
rustc_interface::run_compiler(config, |compiler| {
compiler.enter(|queries| {
// Parse the program and print the syntax tree.
let parse = queries.parse().unwrap().take();
println!("{:#?}", parse);
// Analyze the program and inspect the types of definitions.
queries.global_ctxt().unwrap().take().enter(|tcx| {
for (_, item) in &tcx.hir().krate().items {
match item.kind {
rustc_hir::ItemKind::Static(_, _, _) | rustc_hir::ItemKind::Fn(_, _, _) => {
let name = item.ident;
let ty = tcx.type_of(tcx.hir().local_def_id(item.hir_id));
println!("{:?}:\t{:?}", name, ty)
}
_ => (),
}
}
})
});
});
}
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