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Diffstat (limited to 'src/doc/rustc-dev-guide/examples/rustc-driver-getting-diagnostics.rs')
-rw-r--r-- | src/doc/rustc-dev-guide/examples/rustc-driver-getting-diagnostics.rs | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/src/doc/rustc-dev-guide/examples/rustc-driver-getting-diagnostics.rs b/src/doc/rustc-dev-guide/examples/rustc-driver-getting-diagnostics.rs new file mode 100644 index 000000000..1d3a4034e --- /dev/null +++ b/src/doc/rustc-dev-guide/examples/rustc-driver-getting-diagnostics.rs @@ -0,0 +1,96 @@ +#![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 rustc_errors::registry; +use rustc_session::config::{self, CheckCfg}; +use rustc_span::source_map; +use std::io; +use std::path; +use std::process; +use std::str; +use std::sync; + +// Buffer diagnostics in a Vec<u8>. +#[derive(Clone)] +pub struct DiagnosticSink(sync::Arc<sync::Mutex<Vec<u8>>>); + +impl io::Write for DiagnosticSink { + fn write(&mut self, buf: &[u8]) -> io::Result<usize> { + self.0.lock().unwrap().write(buf) + } + fn flush(&mut self) -> io::Result<()> { + self.0.lock().unwrap().flush() + } +} + +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 buffer = sync::Arc::new(sync::Mutex::new(Vec::new())); + let config = rustc_interface::Config { + opts: config::Options { + maybe_sysroot: Some(path::PathBuf::from(sysroot)), + // Configure the compiler to emit diagnostics in compact JSON format. + error_format: config::ErrorOutputType::Json { + pretty: false, + json_rendered: rustc_errors::emitter::HumanReadableErrorType::Default( + rustc_errors::emitter::ColorConfig::Never, + ), + }, + ..config::Options::default() + }, + // This program contains a type error. + input: config::Input::Str { + name: source_map::FileName::Custom("main.rs".into()), + input: " +fn main() { + let x: &str = 1; +} +" + .into(), + }, + // Redirect the diagnostic output of the compiler to a buffer. + diagnostic_output: rustc_session::DiagnosticOutput::Raw(Box::from(DiagnosticSink( + buffer.clone(), + ))), + crate_cfg: rustc_hash::FxHashSet::default(), + crate_check_cfg: CheckCfg::default(), + input_path: None, + output_dir: None, + output_file: None, + file_loader: None, + lint_caps: rustc_hash::FxHashMap::default(), + parse_sess_created: None, + register_lints: None, + override_queries: None, + registry: registry::Registry::new(&rustc_error_codes::DIAGNOSTICS), + make_codegen_backend: None, + }; + rustc_interface::run_compiler(config, |compiler| { + compiler.enter(|queries| { + queries.global_ctxt().unwrap().take().enter(|tcx| { + // Run the analysis phase on the local crate to trigger the type error. + let _ = tcx.analysis(()); + }); + }); + }); + // Read buffered diagnostics. + let diagnostics = String::from_utf8(buffer.lock().unwrap().clone()).unwrap(); + println!("{diagnostics}"); +} |