Move a bunch of stuff from Session to syntax::errors

The intention here is that Session is a very thin wrapper over the error handling infra.

src/librustc/session/mod.rs

@@ -64,14 +64,10 @@ pub struct Session {
     pub crate_metadata: RefCell<Vec<String>>,
     pub features: RefCell<feature_gate::Features>,
 
-    pub delayed_span_bug: RefCell<Option<(codemap::Span, String)>>,
-
     /// The maximum recursion limit for potentially infinitely recursive
     /// operations such as auto-dereference and monomorphization.
     pub recursion_limit: Cell<usize>,
 
-    pub can_print_warnings: bool,
-
     /// The metadata::creader module may inject an allocator dependency if it
     /// didn't already find one, and this tracks what was injected.
     pub injected_allocator: Cell<Option<ast::CrateNum>>,
@@ -85,21 +81,12 @@ pub struct Session {
 
 impl Session {
     pub fn span_fatal(&self, sp: Span, msg: &str) -> ! {
-        if self.opts.treat_err_as_bug {
-            self.span_bug(sp, msg);
-        }
         panic!(self.diagnostic().span_fatal(sp, msg))
     }
     pub fn span_fatal_with_code(&self, sp: Span, msg: &str, code: &str) -> ! {
-        if self.opts.treat_err_as_bug {
-            self.span_bug(sp, msg);
-        }
         panic!(self.diagnostic().span_fatal_with_code(sp, msg, code))
     }
     pub fn fatal(&self, msg: &str) -> ! {
-        if self.opts.treat_err_as_bug {
-            self.bug(msg);
-        }
         panic!(self.diagnostic().fatal(msg))
     }
     pub fn span_err_or_warn(&self, is_warning: bool, sp: Span, msg: &str) {
@@ -110,9 +97,6 @@ impl Session {
         }
     }
     pub fn span_err(&self, sp: Span, msg: &str) {
-        if self.opts.treat_err_as_bug {
-            self.span_bug(sp, msg);
-        }
         match split_msg_into_multilines(msg) {
             Some(msg) => self.diagnostic().span_err(sp, &msg[..]),
             None => self.diagnostic().span_err(sp, msg)
@@ -126,18 +110,12 @@ impl Session {
                       See RFC 1214 for details."));
     }
     pub fn span_err_with_code(&self, sp: Span, msg: &str, code: &str) {
-        if self.opts.treat_err_as_bug {
-            self.span_bug(sp, msg);
-        }
         match split_msg_into_multilines(msg) {
             Some(msg) => self.diagnostic().span_err_with_code(sp, &msg[..], code),
             None => self.diagnostic().span_err_with_code(sp, msg, code)
         }
     }
     pub fn err(&self, msg: &str) {
-        if self.opts.treat_err_as_bug {
-            self.bug(msg);
-        }
         self.diagnostic().err(msg)
     }
     pub fn err_count(&self) -> usize {
@@ -148,14 +126,6 @@ impl Session {
     }
     pub fn abort_if_errors(&self) {
         self.diagnostic().abort_if_errors();
-
-        let delayed_bug = self.delayed_span_bug.borrow();
-        match *delayed_bug {
-            Some((span, ref errmsg)) => {
-                self.diagnostic().span_bug(span, errmsg);
-            },
-            _ => {}
-        }
     }
     pub fn abort_if_new_errors<F>(&self, mut f: F)
         where F: FnMut()
@@ -167,19 +137,13 @@ impl Session {
         }
     }
     pub fn span_warn(&self, sp: Span, msg: &str) {
-        if self.can_print_warnings {
+        self.diagnostic().span_warn(sp, msg)
-            self.diagnostic().span_warn(sp, msg)
-        }
     }
     pub fn span_warn_with_code(&self, sp: Span, msg: &str, code: &str) {
-        if self.can_print_warnings {
+        self.diagnostic().span_warn_with_code(sp, msg, code)
-            self.diagnostic().span_warn_with_code(sp, msg, code)
-        }
     }
     pub fn warn(&self, msg: &str) {
-        if self.can_print_warnings {
+        self.diagnostic().warn(msg)
-            self.diagnostic().warn(msg)
-        }
     }
     pub fn opt_span_warn(&self, opt_sp: Option<Span>, msg: &str) {
         match opt_sp {
@@ -223,8 +187,7 @@ impl Session {
     }
     /// Delay a span_bug() call until abort_if_errors()
     pub fn delay_span_bug(&self, sp: Span, msg: &str) {
-        let mut delayed = self.delayed_span_bug.borrow_mut();
+        self.diagnostic().delay_span_bug(sp, msg)
-        *delayed = Some((sp, msg.to_string()));
     }
     pub fn span_bug(&self, sp: Span, msg: &str) -> ! {
         self.diagnostic().span_bug(sp, msg)
@@ -270,8 +233,7 @@ impl Session {
     // This exists to help with refactoring to eliminate impossible
     // cases later on
     pub fn impossible_case(&self, sp: Span, msg: &str) -> ! {
-        self.span_bug(sp,
+        self.span_bug(sp, &format!("impossible case reached: {}", msg));
-                      &format!("impossible case reached: {}", msg));
     }
     pub fn verbose(&self) -> bool { self.opts.debugging_opts.verbose }
     pub fn time_passes(&self) -> bool { self.opts.debugging_opts.time_passes }
@@ -414,10 +376,15 @@ pub fn build_session(sopts: config::Options,
         .map(|&(_, ref level)| *level != lint::Allow)
         .last()
         .unwrap_or(true);
+    let treat_err_as_bug = sopts.treat_err_as_bug;
 
     let codemap = Rc::new(codemap::CodeMap::new());
     let diagnostic_handler =
-        errors::Handler::new(sopts.color, Some(registry), can_print_warnings, codemap.clone());
+        errors::Handler::new(sopts.color,
+                             Some(registry),
+                             can_print_warnings,
+                             treat_err_as_bug,
+                             codemap.clone());
 
     build_session_(sopts, local_crate_source_file, diagnostic_handler, codemap, cstore)
 }
@@ -450,13 +417,6 @@ pub fn build_session_(sopts: config::Options,
         }
     );
 
-    let can_print_warnings = sopts.lint_opts
-        .iter()
-        .filter(|&&(ref key, _)| *key == "warnings")
-        .map(|&(_, ref level)| *level != lint::Allow)
-        .last()
-        .unwrap_or(true);
-
     let sess = Session {
         target: target_cfg,
         host: host,
@@ -477,10 +437,8 @@ pub fn build_session_(sopts: config::Options,
         crate_types: RefCell::new(Vec::new()),
         dependency_formats: RefCell::new(FnvHashMap()),
         crate_metadata: RefCell::new(Vec::new()),
-        delayed_span_bug: RefCell::new(None),
         features: RefCell::new(feature_gate::Features::new()),
         recursion_limit: Cell::new(64),
-        can_print_warnings: can_print_warnings,
         next_node_id: Cell::new(1),
         injected_allocator: Cell::new(None),
         available_macros: RefCell::new(HashSet::new()),
@@ -489,13 +447,6 @@ pub fn build_session_(sopts: config::Options,
     sess
 }
 
-// Seems out of place, but it uses session, so I'm putting it here
-pub fn expect<T, M>(sess: &Session, opt: Option<T>, msg: M) -> T where
-    M: FnOnce() -> String,
-{
-    errors::expect(sess.diagnostic(), opt, msg)
-}
-
 pub fn early_error(color: errors::ColorConfig, msg: &str) -> ! {
     let mut emitter = BasicEmitter::stderr(color);
     emitter.emit(None, msg, None, errors::Level::Fatal);

src/librustc_trans/back/write.rs

@@ -862,7 +862,7 @@ fn run_work_multithreaded(sess: &Session,
         futures.push(rx);
 
         thread::Builder::new().name(format!("codegen-{}", i)).spawn(move || {
-            let diag_handler = Handler::with_emitter(true, box diag_emitter);
+            let diag_handler = Handler::with_emitter(true, false, box diag_emitter);
 
             // Must construct cgcx inside the proc because it has non-Send
             // fields.

src/librustc_trans/trans/callee.rs

@@ -20,7 +20,6 @@ pub use self::CallArgs::*;
 
 use arena::TypedArena;
 use back::link;
-use session;
 use llvm::{self, ValueRef, get_params};
 use middle::cstore::LOCAL_CRATE;
 use middle::def;
@@ -57,6 +56,7 @@ use rustc_front::hir;
 
 use syntax::abi as synabi;
 use syntax::ast;
+use syntax::errors;
 use syntax::ptr::P;
 
 #[derive(Copy, Clone)]
@@ -412,8 +412,8 @@ pub fn trans_fn_ref_with_substs<'a, 'tcx>(
             Some(n) => n,
             None => { return false; }
         };
-        let map_node = session::expect(
+        let map_node = errors::expect(
-            &tcx.sess,
+            &tcx.sess.diagnostic(),
             tcx.map.find(node_id),
             || "local item should be in ast map".to_string());
 

src/librustc_trans/trans/monomorphize.rs

@@ -9,7 +9,6 @@
 // except according to those terms.
 
 use back::link::exported_name;
-use session;
 use llvm::ValueRef;
 use llvm;
 use middle::def_id::DefId;
@@ -32,6 +31,7 @@ use rustc_front::hir;
 use syntax::abi;
 use syntax::ast;
 use syntax::attr;
+use syntax::errors;
 use std::hash::{Hasher, Hash, SipHasher};
 
 pub fn monomorphic_fn<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>,
@@ -83,8 +83,8 @@ pub fn monomorphic_fn<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>,
            hash_id);
 
 
-    let map_node = session::expect(
+    let map_node = errors::expect(
-        ccx.sess(),
+        ccx.sess().diagnostic(),
         ccx.tcx().map.find(fn_node_id),
         || {
             format!("while monomorphizing {:?}, couldn't find it in \

src/libsyntax/parse/mod.rs

@@ -49,7 +49,7 @@ pub struct ParseSess {
 impl ParseSess {
     pub fn new() -> ParseSess {
         let cm = Rc::new(CodeMap::new());
-        let handler = Handler::new(ColorConfig::Auto, None, true, cm.clone());
+        let handler = Handler::new(ColorConfig::Auto, None, true, false, cm.clone());
         ParseSess::with_span_handler(handler, cm)
     }