Remove export_name query

Part of #47320

src/librustc_trans_utils/diagnostics.rs

@@ -1,38 +0,0 @@
-// Copyright 2017 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.
-
-#![allow(non_snake_case)]
-
-register_long_diagnostics! {
-
-E0558: r##"
-The `export_name` attribute was malformed.
-
-Erroneous code example:
-
-```ignore (error-emitted-at-codegen-which-cannot-be-handled-by-compile_fail)
-#[export_name] // error: export_name attribute has invalid format
-pub fn something() {}
-
-fn main() {}
-```
-
-The `export_name` attribute expects a string in order to determine the name of
-the exported symbol. Example:
-
-```
-#[export_name = "some_function"] // ok!
-pub fn something() {}
-
-fn main() {}
-```
-"##,
-
-}

src/librustc_trans_utils/lib.rs

@@ -37,7 +37,6 @@ extern crate rustc;
 extern crate rustc_back;
 extern crate rustc_mir;
 extern crate rustc_incremental;
-#[macro_use]
 extern crate syntax;
 extern crate syntax_pos;
 extern crate rustc_data_structures;
@@ -46,7 +45,6 @@ pub extern crate rustc as __rustc;
 
 use rustc::ty::TyCtxt;
 
-pub mod diagnostics;
 pub mod link;
 pub mod trans_crate;
 pub mod symbol_names;

src/librustc_trans_utils/symbol_names.rs

@@ -120,27 +120,9 @@ pub fn provide(providers: &mut Providers) {
         def_symbol_name,
         symbol_name,
 
-        export_name: |tcx, id| {
-            tcx.get_attrs(id).iter().fold(None, |ia, attr| {
-                if attr.check_name("export_name") {
-                    if let s @ Some(_) = attr.value_str() {
-                        s
-                    } else {
-                        struct_span_err!(tcx.sess, attr.span, E0558,
-                                         "export_name attribute has invalid format")
-                            .span_label(attr.span, "did you mean #[export_name=\"*\"]?")
-                            .emit();
-                        None
-                    }
-                } else {
-                    ia
-                }
-            })
-        },
-
         contains_extern_indicator: |tcx, id| {
             attr::contains_name(&tcx.get_attrs(id), "no_mangle") ||
-                tcx.export_name(id).is_some()
+                tcx.trans_fn_attrs(id).export_name.is_some()
         },
 
         ..*providers
@@ -287,7 +269,7 @@ fn compute_symbol_name<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>, instance: Instance
         return tcx.item_name(def_id).to_string();
     }
 
-    if let Some(name) = tcx.export_name(def_id) {
+    if let Some(name) = tcx.trans_fn_attrs(def_id).export_name {
         // Use provided name
         return name.to_string();
     }

src/librustc_trans_utils/trans_crate.rs

@@ -233,7 +233,6 @@ impl TransCrate for MetadataOnlyTransCrate {
                 MonoItem::Fn(inst) => {
                     let def_id = inst.def_id();
                     if def_id.is_local()  {
-                        let _ = tcx.export_name(def_id);
                         let _ = tcx.contains_extern_indicator(def_id);
                         let _ = inst.def.is_inline(tcx);
                         let _ = tcx.trans_fn_attrs(def_id);