6515ac9d3f
Add more APIs to retrieve information about types, and add more instance resolution options. Make `Instance::body()` return an Option<Body>, since not every instance might have an available body. For example, foreign instances, virtual instances, dependencies.
149 lines
4.4 KiB
Rust
149 lines
4.4 KiB
Rust
// run-pass
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//! Sanity check Stable MIR Visitor
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// ignore-stage1
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// ignore-cross-compile
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// ignore-remote
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// ignore-windows-gnu mingw has troubles with linking https://github.com/rust-lang/rust/pull/116837
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// edition: 2021
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#![feature(rustc_private)]
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#![feature(assert_matches)]
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#![feature(control_flow_enum)]
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extern crate rustc_middle;
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#[macro_use]
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extern crate rustc_smir;
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extern crate rustc_driver;
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extern crate rustc_interface;
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extern crate stable_mir;
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use std::collections::HashSet;
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use rustc_middle::ty::TyCtxt;
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use rustc_smir::rustc_internal;
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use stable_mir::*;
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use stable_mir::mir::MirVisitor;
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use std::io::Write;
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use std::ops::ControlFlow;
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const CRATE_NAME: &str = "input";
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fn test_visitor(_tcx: TyCtxt<'_>) -> ControlFlow<()> {
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let main_fn = stable_mir::entry_fn();
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let main_body = main_fn.unwrap().body();
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let main_visitor = TestVisitor::collect(&main_body);
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assert!(main_visitor.ret_val.is_some());
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assert!(main_visitor.args.is_empty());
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assert!(main_visitor.tys.contains(&main_visitor.ret_val.unwrap().ty));
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assert!(!main_visitor.calls.is_empty());
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let exit_fn = main_visitor.calls.last().unwrap();
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assert!(exit_fn.mangled_name().contains("exit_fn"), "Unexpected last function: {exit_fn:?}");
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let exit_body = exit_fn.body().unwrap();
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let exit_visitor = TestVisitor::collect(&exit_body);
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assert!(exit_visitor.ret_val.is_some());
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assert_eq!(exit_visitor.args.len(), 1);
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assert!(exit_visitor.tys.contains(&exit_visitor.ret_val.unwrap().ty));
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assert!(exit_visitor.tys.contains(&exit_visitor.args[0].ty));
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ControlFlow::Continue(())
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}
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struct TestVisitor<'a> {
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pub body: &'a mir::Body,
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pub tys: HashSet<ty::Ty>,
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pub ret_val: Option<mir::LocalDecl>,
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pub args: Vec<mir::LocalDecl>,
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pub calls: Vec<mir::mono::Instance>
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}
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impl<'a> TestVisitor<'a> {
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fn collect(body: &'a mir::Body) -> TestVisitor<'a> {
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let mut visitor = TestVisitor {
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body: &body,
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tys: Default::default(),
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ret_val: None,
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args: vec![],
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calls: vec![],
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};
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visitor.visit_body(&body);
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visitor
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}
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}
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impl<'a> mir::MirVisitor for TestVisitor<'a> {
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fn visit_ty(&mut self, ty: &ty::Ty, _location: mir::visit::Location) {
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self.tys.insert(*ty);
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self.super_ty(ty)
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}
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fn visit_ret_decl(&mut self, local: mir::Local, decl: &mir::LocalDecl) {
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assert!(local == mir::RETURN_LOCAL);
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assert!(self.ret_val.is_none());
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self.ret_val = Some(decl.clone());
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self.super_ret_decl(local, decl);
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}
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fn visit_arg_decl(&mut self, local: mir::Local, decl: &mir::LocalDecl) {
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self.args.push(decl.clone());
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assert_eq!(local, self.args.len());
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self.super_arg_decl(local, decl);
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}
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fn visit_terminator(&mut self, term: &mir::Terminator, location: mir::visit::Location) {
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if let mir::TerminatorKind::Call { func, .. } = &term.kind {
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let ty::TyKind::RigidTy(ty) = func.ty(self.body.locals()).kind() else { unreachable!
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() };
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let ty::RigidTy::FnDef(def, args) = ty else { unreachable!() };
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self.calls.push(mir::mono::Instance::resolve(def, &args).unwrap());
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}
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self.super_terminator(term, location);
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}
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}
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/// This test will generate and analyze a dummy crate using the stable mir.
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/// For that, it will first write the dummy crate into a file.
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/// Then it will create a `StableMir` using custom arguments and then
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/// it will run the compiler.
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fn main() {
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let path = "sim_visitor_input.rs";
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generate_input(&path).unwrap();
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let args = vec![
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"rustc".to_string(),
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"-Cpanic=abort".to_string(),
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"--crate-name".to_string(),
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CRATE_NAME.to_string(),
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path.to_string(),
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];
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run!(args, tcx, test_visitor(tcx)).unwrap();
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}
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fn generate_input(path: &str) -> std::io::Result<()> {
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let mut file = std::fs::File::create(path)?;
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write!(
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file,
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r#"
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fn main() -> std::process::ExitCode {{
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let inputs = Inputs::new();
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let total = inputs.values.iter().sum();
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exit_fn(total)
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}}
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fn exit_fn(code: u8) -> std::process::ExitCode {{
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std::process::ExitCode::from(code)
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}}
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struct Inputs {{
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values: [u8; 3],
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}}
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impl Inputs {{
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fn new() -> Inputs {{
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Inputs {{ values: [0, 1, 2] }}
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}}
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}}
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"#
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)?;
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Ok(())
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}
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