87 lines
2.1 KiB
Rust
87 lines
2.1 KiB
Rust
// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
|
|
// file at the top-level directory of this distribution and at
|
|
// http://rust-lang.org/COPYRIGHT.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
|
|
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
|
|
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
|
|
// option. This file may not be copied, modified, or distributed
|
|
// except according to those terms.
|
|
|
|
//! Span debugger
|
|
//!
|
|
//! This module shows spans for all expressions in the crate
|
|
//! to help with compiler debugging.
|
|
|
|
use std::str::FromStr;
|
|
|
|
use ast;
|
|
use errors;
|
|
use visit;
|
|
use visit::Visitor;
|
|
|
|
enum Mode {
|
|
Expression,
|
|
Pattern,
|
|
Type,
|
|
}
|
|
|
|
impl FromStr for Mode {
|
|
type Err = ();
|
|
fn from_str(s: &str) -> Result<Mode, ()> {
|
|
let mode = match s {
|
|
"expr" => Mode::Expression,
|
|
"pat" => Mode::Pattern,
|
|
"ty" => Mode::Type,
|
|
_ => return Err(())
|
|
};
|
|
Ok(mode)
|
|
}
|
|
}
|
|
|
|
struct ShowSpanVisitor<'a> {
|
|
span_diagnostic: &'a errors::Handler,
|
|
mode: Mode,
|
|
}
|
|
|
|
impl<'a> Visitor<'a> for ShowSpanVisitor<'a> {
|
|
fn visit_expr(&mut self, e: &'a ast::Expr) {
|
|
if let Mode::Expression = self.mode {
|
|
self.span_diagnostic.span_warn(e.span, "expression");
|
|
}
|
|
visit::walk_expr(self, e);
|
|
}
|
|
|
|
fn visit_pat(&mut self, p: &'a ast::Pat) {
|
|
if let Mode::Pattern = self.mode {
|
|
self.span_diagnostic.span_warn(p.span, "pattern");
|
|
}
|
|
visit::walk_pat(self, p);
|
|
}
|
|
|
|
fn visit_ty(&mut self, t: &'a ast::Ty) {
|
|
if let Mode::Type = self.mode {
|
|
self.span_diagnostic.span_warn(t.span, "type");
|
|
}
|
|
visit::walk_ty(self, t);
|
|
}
|
|
|
|
fn visit_mac(&mut self, mac: &'a ast::Mac) {
|
|
visit::walk_mac(self, mac);
|
|
}
|
|
}
|
|
|
|
pub fn run(span_diagnostic: &errors::Handler,
|
|
mode: &str,
|
|
krate: &ast::Crate) {
|
|
let mode = match mode.parse().ok() {
|
|
Some(mode) => mode,
|
|
None => return
|
|
};
|
|
let mut v = ShowSpanVisitor {
|
|
span_diagnostic,
|
|
mode,
|
|
};
|
|
visit::walk_crate(&mut v, krate);
|
|
}
|