Auto merge of #27507 - eefriedman:link-section, r=alexcrichton

Fixes #27467.

src/librustc_trans/trans/base.rs

@@ -2032,6 +2032,23 @@ pub fn update_linkage(ccx: &CrateContext,
     }
 }
 
+fn set_global_section(ccx: &CrateContext, llval: ValueRef, i: &ast::Item) {
+    match attr::first_attr_value_str_by_name(&i.attrs,
+                                             "link_section") {
+        Some(sect) => {
+            if contains_null(&sect) {
+                ccx.sess().fatal(&format!("Illegal null byte in link_section value: `{}`",
+                                            &sect));
+            }
+            unsafe {
+                let buf = CString::new(sect.as_bytes()).unwrap();
+                llvm::LLVMSetSection(llval, buf.as_ptr());
+            }
+        },
+        None => ()
+    }
+}
+
 pub fn trans_item(ccx: &CrateContext, item: &ast::Item) {
     let _icx = push_ctxt("trans_item");
 
@@ -2054,6 +2071,7 @@ pub fn trans_item(ccx: &CrateContext, item: &ast::Item) {
                 } else {
                     trans_fn(ccx, &**decl, &**body, llfn, empty_substs, item.id, &item.attrs);
                 }
+                set_global_section(ccx, llfn, item);
                 update_linkage(ccx, llfn, Some(item.id),
                                if is_origin { OriginalTranslation } else { InlinedCopy });
 
@@ -2103,6 +2121,7 @@ pub fn trans_item(ccx: &CrateContext, item: &ast::Item) {
           v.visit_expr(&**expr);
 
           let g = consts::trans_static(ccx, m, expr, item.id, &item.attrs);
+          set_global_section(ccx, g, item);
           update_linkage(ccx, g, Some(item.id), OriginalTranslation);
       },
       ast::ItemForeignMod(ref foreign_mod) => {
@@ -2387,21 +2406,6 @@ pub fn get_item_val(ccx: &CrateContext, id: ast::NodeId) -> ValueRef {
                 _ => ccx.sess().bug("get_item_val: weird result in table")
             };
 
-            match attr::first_attr_value_str_by_name(&i.attrs,
-                                                     "link_section") {
-                Some(sect) => {
-                    if contains_null(&sect) {
-                        ccx.sess().fatal(&format!("Illegal null byte in link_section value: `{}`",
-                                                 &sect));
-                    }
-                    unsafe {
-                        let buf = CString::new(sect.as_bytes()).unwrap();
-                        llvm::LLVMSetSection(v, buf.as_ptr());
-                    }
-                },
-                None => ()
-            }
-
             v
         }
 

src/test/codegen/link_section.rs

+// Copyright 2015 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.
+
+// compile-flags: -C no-prepopulate-passes
+
+// CHECK: @VAR1 = constant i32 1, section ".test_one"
+#[no_mangle]
+#[link_section = ".test_one"]
+pub static VAR1: u32 = 1;
+
+pub enum E {
+    A(u32),
+    B(f32)
+}
+
+// CHECK: @VAR2 = constant {{.*}} { i32 0, i32 666, {{.*}} }, section ".test_two"
+#[no_mangle]
+#[link_section = ".test_two"]
+pub static VAR2: E = E::A(666);
+
+// CHECK: @VAR3 = constant {{.*}} { i32 1, float 1.000000e+00, {{.*}} }, section ".test_three"
+#[no_mangle]
+#[link_section = ".test_three"]
+pub static VAR3: E = E::B(1.);
+
+// CHECK: define void @fn1() {{.*}} section ".test_four" {
+#[no_mangle]
+#[link_section = ".test_four"]
+pub fn fn1() {}