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|
// run-pass
//! Sanity check Stable MIR Visitor
// ignore-stage1
// ignore-cross-compile
// ignore-remote
// ignore-windows-gnu mingw has troubles with linking https://github.com/rust-lang/rust/pull/116837
// edition: 2021
#![feature(rustc_private)]
#![feature(assert_matches)]
#![feature(control_flow_enum)]
extern crate rustc_middle;
#[macro_use]
extern crate rustc_smir;
extern crate rustc_driver;
extern crate rustc_interface;
extern crate stable_mir;
use std::collections::HashSet;
use rustc_middle::ty::TyCtxt;
use rustc_smir::rustc_internal;
use stable_mir::*;
use stable_mir::mir::MirVisitor;
use std::io::Write;
use std::ops::ControlFlow;
const CRATE_NAME: &str = "input";
fn test_visitor(_tcx: TyCtxt<'_>) -> ControlFlow<()> {
let main_fn = stable_mir::entry_fn();
let main_body = main_fn.unwrap().body();
let main_visitor = TestVisitor::collect(&main_body);
assert!(main_visitor.ret_val.is_some());
assert!(main_visitor.args.is_empty());
assert!(main_visitor.tys.contains(&main_visitor.ret_val.unwrap().ty));
assert!(!main_visitor.calls.is_empty());
let exit_fn = main_visitor.calls.last().unwrap();
assert!(exit_fn.mangled_name().contains("exit_fn"), "Unexpected last function: {exit_fn:?}");
let exit_body = exit_fn.body().unwrap();
let exit_visitor = TestVisitor::collect(&exit_body);
assert!(exit_visitor.ret_val.is_some());
assert_eq!(exit_visitor.args.len(), 1);
assert!(exit_visitor.tys.contains(&exit_visitor.ret_val.unwrap().ty));
assert!(exit_visitor.tys.contains(&exit_visitor.args[0].ty));
ControlFlow::Continue(())
}
struct TestVisitor<'a> {
pub body: &'a mir::Body,
pub tys: HashSet<ty::Ty>,
pub ret_val: Option<mir::LocalDecl>,
pub args: Vec<mir::LocalDecl>,
pub calls: Vec<mir::mono::Instance>
}
impl<'a> TestVisitor<'a> {
fn collect(body: &'a mir::Body) -> TestVisitor<'a> {
let mut visitor = TestVisitor {
body: &body,
tys: Default::default(),
ret_val: None,
args: vec![],
calls: vec![],
};
visitor.visit_body(&body);
visitor
}
}
impl<'a> mir::MirVisitor for TestVisitor<'a> {
fn visit_ty(&mut self, ty: &ty::Ty, _location: mir::visit::Location) {
self.tys.insert(*ty);
self.super_ty(ty)
}
fn visit_ret_decl(&mut self, local: mir::Local, decl: &mir::LocalDecl) {
assert!(local == mir::RETURN_LOCAL);
assert!(self.ret_val.is_none());
self.ret_val = Some(decl.clone());
self.super_ret_decl(local, decl);
}
fn visit_arg_decl(&mut self, local: mir::Local, decl: &mir::LocalDecl) {
self.args.push(decl.clone());
assert_eq!(local, self.args.len());
self.super_arg_decl(local, decl);
}
fn visit_terminator(&mut self, term: &mir::Terminator, location: mir::visit::Location) {
if let mir::TerminatorKind::Call { func, .. } = &term.kind {
let ty::TyKind::RigidTy(ty) = func.ty(self.body.locals()).unwrap().kind() else {
unreachable!
() };
let ty::RigidTy::FnDef(def, args) = ty else { unreachable!() };
self.calls.push(mir::mono::Instance::resolve(def, &args).unwrap());
}
self.super_terminator(term, location);
}
}
/// This test will generate and analyze a dummy crate using the stable mir.
/// For that, it will first write the dummy crate into a file.
/// Then it will create a `StableMir` using custom arguments and then
/// it will run the compiler.
fn main() {
let path = "sim_visitor_input.rs";
generate_input(&path).unwrap();
let args = vec![
"rustc".to_string(),
"-Cpanic=abort".to_string(),
"--crate-name".to_string(),
CRATE_NAME.to_string(),
path.to_string(),
];
run!(args, tcx, test_visitor(tcx)).unwrap();
}
fn generate_input(path: &str) -> std::io::Result<()> {
let mut file = std::fs::File::create(path)?;
write!(
file,
r#"
fn main() -> std::process::ExitCode {{
let inputs = Inputs::new();
let total = inputs.values.iter().sum();
exit_fn(total)
}}
fn exit_fn(code: u8) -> std::process::ExitCode {{
std::process::ExitCode::from(code)
}}
struct Inputs {{
values: [u8; 3],
}}
impl Inputs {{
fn new() -> Inputs {{
Inputs {{ values: [0, 1, 2] }}
}}
}}
"#
)?;
Ok(())
}
|
