Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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:?}")
+                        }
+                        _ => (),
+                    }
+                }
+            })
+        });
+    });
+}