Support upgrading the alignment of a global variable

patches/0023-core-Ignore-failing-tests.patch

@@ -46,24 +46,4 @@ index 4bc44e9..8e3c7a4 100644
 
  #[test]
  fn cell_allows_array_cycle() {
-diff --git a/library/core/tests/slice.rs b/library/core/tests/slice.rs
-index 3e00e0a..8e5663b 100644
---- a/library/core/tests/slice.rs
-+++ b/library/core/tests/slice.rs
-@@ -2108,6 +2108,7 @@ fn test_copy_within_panics_src_out_of_bounds() {
-     bytes.copy_within(usize::MAX..=usize::MAX, 0);
- }
-
-+/*
- #[test]
- fn test_is_sorted() {
-     let empty: [i32; 0] = [];
-@@ -2122,6 +2123,7 @@ fn test_is_sorted() {
-     assert!(!["c", "bb", "aaa"].is_sorted());
-     assert!(["c", "bb", "aaa"].is_sorted_by_key(|s| s.len()));
- }
-+*/
-
- #[test]
- fn test_slice_run_destructors() {
 -- 2.21.0 (Apple Git-122)

src/consts.rs

@@ -35,7 +35,12 @@ impl<'gcc, 'tcx> StaticMethods for CodegenCx<'gcc, 'tcx> {
         // following:
         for (value, variable) in &*self.const_globals.borrow() {
             if format!("{:?}", value) == format!("{:?}", cv) {
-                // TODO(antoyo): upgrade alignment.
+                if let Some(global_variable) = self.global_lvalues.borrow().get(variable) {
+                    let alignment = align.bits() as i32;
+                    if alignment > global_variable.get_alignment() {
+                        global_variable.set_alignment(alignment);
+                    }
+                }
                 return *variable;
             }
         }
@@ -182,7 +187,9 @@ impl<'gcc, 'tcx> CodegenCx<'gcc, 'tcx> {
         // globally.
         global.global_set_initializer_rvalue(cv);
         // TODO(antoyo): set unnamed address.
-        global.get_address(None)
+        let rvalue = global.get_address(None);
+        self.global_lvalues.borrow_mut().insert(rvalue, global);
+        rvalue
     }
 
     pub fn get_static(&self, def_id: DefId) -> LValue<'gcc> {

src/context.rs

@@ -83,6 +83,9 @@ pub struct CodegenCx<'gcc, 'tcx> {
 
     /// Cache of emitted const globals (value -> global)
     pub const_globals: RefCell<FxHashMap<RValue<'gcc>, RValue<'gcc>>>,
+    /// Map from the address of a global variable (rvalue) to the global variable itself (lvalue).
+    /// TODO(antoyo): remove when the rustc API is fixed.
+    pub global_lvalues: RefCell<FxHashMap<RValue<'gcc>, LValue<'gcc>>>,
 
     /// Cache of constant strings,
     pub const_cstr_cache: RefCell<FxHashMap<Symbol, LValue<'gcc>>>,
@@ -195,6 +198,7 @@ impl<'gcc, 'tcx> CodegenCx<'gcc, 'tcx> {
             function_instances: Default::default(),
             vtables: Default::default(),
             const_globals: Default::default(),
+            global_lvalues: Default::default(),
             const_cstr_cache: Default::default(),
             globals: Default::default(),
             scalar_types: Default::default(),