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Diffstat (limited to 'src/doc/rustc-dev-guide/examples/rustc-driver-example.rs')
-rw-r--r-- | src/doc/rustc-dev-guide/examples/rustc-driver-example.rs | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/src/doc/rustc-dev-guide/examples/rustc-driver-example.rs b/src/doc/rustc-dev-guide/examples/rustc-driver-example.rs new file mode 100644 index 000000000..4203fe96a --- /dev/null +++ b/src/doc/rustc-dev-guide/examples/rustc-driver-example.rs @@ -0,0 +1,94 @@ +#![feature(rustc_private)] + +// NOTE: For the example to compile, you will need to first run the following: +// rustup component add rustc-dev llvm-tools-preview + +// version: 1.62.0-nightly (7c4b47696 2022-04-30) + +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 std::{path, process, str}; + +use rustc_errors::registry; +use rustc_hash::{FxHashMap, FxHashSet}; +use rustc_session::config::{self, CheckCfg}; +use rustc_span::source_map; + +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>)> + crate_check_cfg: CheckCfg::default(), // CheckCfg + input: config::Input::Str { + name: source_map::FileName::Custom("main.rs".into()), + input: r#" +static HELLO: &str = "Hello, world!"; +fn main() { + println!("{HELLO}"); +} +"# + .into(), + }, + 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, + lint_caps: FxHashMap::default(), // FxHashMap<lint::LintId, lint::Level> + // This is a callback from the driver that is called when [`ParseSess`] is created. + parse_sess_created: None, //Option<Box<dyn FnOnce(&mut ParseSess) + Send>> + // 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), + make_codegen_backend: None, + }; + 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 id in tcx.hir().items() { + let hir = tcx.hir(); + let item = hir.item(id); + match item.kind { + rustc_hir::ItemKind::Static(_, _, _) | rustc_hir::ItemKind::Fn(_, _, _) => { + let name = item.ident; + let ty = tcx.type_of(hir.local_def_id(item.hir_id())); + println!("{name:?}:\t{ty:?}") + } + _ => (), + } + } + }) + }); + }); +} |