Sync from rust faae5f1

Author: bjorn3

example/mini_core.rs

@@ -465,6 +465,36 @@ pub fn panic(_msg: &'static str) -> ! {
     }
 }
 
+macro_rules! panic_const {
+    ($($lang:ident = $message:expr,)+) => {
+        #[cfg(not(bootstrap))]
+        pub mod panic_const {
+            use super::*;
+
+            $(
+                #[track_caller]
+                #[lang = stringify!($lang)]
+                pub fn $lang() -> ! {
+                    panic($message);
+                }
+            )+
+        }
+    }
+}
+
+panic_const! {
+    panic_const_add_overflow = "attempt to add with overflow",
+    panic_const_sub_overflow = "attempt to subtract with overflow",
+    panic_const_mul_overflow = "attempt to multiply with overflow",
+    panic_const_div_overflow = "attempt to divide with overflow",
+    panic_const_rem_overflow = "attempt to calculate the remainder with overflow",
+    panic_const_neg_overflow = "attempt to negate with overflow",
+    panic_const_shr_overflow = "attempt to shift right with overflow",
+    panic_const_shl_overflow = "attempt to shift left with overflow",
+    panic_const_div_by_zero = "attempt to divide by zero",
+    panic_const_rem_by_zero = "attempt to calculate the remainder with a divisor of zero",
+}
+
 #[lang = "panic_bounds_check"]
 #[track_caller]
 fn panic_bounds_check(index: usize, len: usize) -> ! {

src/base.rs

@@ -372,8 +372,14 @@ fn codegen_fn_body(fx: &mut FunctionCx<'_, '_, '_>, start_block: Block) {
                         );
                     }
                     _ => {
-                        let msg_str = msg.description();
-                        codegen_panic(fx, msg_str, source_info);
+                        let location = fx.get_caller_location(source_info).load_scalar(fx);
+
+                        codegen_panic_inner(
+                            fx,
+                            msg.panic_function(),
+                            &[location],
+                            Some(source_info.span),
+                        );
                     }
                 }
             }
@@ -957,20 +963,6 @@ pub(crate) fn codegen_operand<'tcx>(
     }
 }
 
-pub(crate) fn codegen_panic<'tcx>(
-    fx: &mut FunctionCx<'_, '_, 'tcx>,
-    msg_str: &str,
-    source_info: mir::SourceInfo,
-) {
-    let location = fx.get_caller_location(source_info).load_scalar(fx);
-
-    let msg_ptr = fx.anonymous_str(msg_str);
-    let msg_len = fx.bcx.ins().iconst(fx.pointer_type, i64::try_from(msg_str.len()).unwrap());
-    let args = [msg_ptr, msg_len, location];
-
-    codegen_panic_inner(fx, rustc_hir::LangItem::Panic, &args, Some(source_info.span));
-}
-
 pub(crate) fn codegen_panic_nounwind<'tcx>(
     fx: &mut FunctionCx<'_, '_, 'tcx>,
     msg_str: &str,

src/debuginfo/line_info.rs

@@ -89,11 +89,7 @@ impl DebugContext {
             match &source_file.name {
                 FileName::Real(path) => {
                     let (dir_path, file_name) =
-                        split_path_dir_and_file(if self.should_remap_filepaths {
-                            path.remapped_path_if_available()
-                        } else {
-                            path.local_path_if_available()
-                        });
+                        split_path_dir_and_file(path.to_path(self.filename_display_preference));
                     let dir_name = osstr_as_utf8_bytes(dir_path.as_os_str());
                     let file_name = osstr_as_utf8_bytes(file_name);
 
@@ -115,14 +111,7 @@ impl DebugContext {
                 filename => {
                     let dir_id = line_program.default_directory();
                     let dummy_file_name = LineString::new(
-                        filename
-                            .display(if self.should_remap_filepaths {
-                                FileNameDisplayPreference::Remapped
-                            } else {
-                                FileNameDisplayPreference::Local
-                            })
-                            .to_string()
-                            .into_bytes(),
+                        filename.display(self.filename_display_preference).to_string().into_bytes(),
                         line_program.encoding(),
                         line_strings,
                     );

src/debuginfo/mod.rs

@@ -42,7 +42,7 @@ pub(crate) struct DebugContext {
     namespace_map: DefIdMap<UnitEntryId>,
     array_size_type: UnitEntryId,
 
-    should_remap_filepaths: bool,
+    filename_display_preference: FileNameDisplayPreference,
 }
 
 pub(crate) struct FunctionDebugContext {
@@ -84,22 +84,18 @@ impl DebugContext {
 
         let mut dwarf = DwarfUnit::new(encoding);
 
-        let should_remap_filepaths = tcx.sess.should_prefer_remapped_for_codegen();
+        use rustc_session::config::RemapPathScopeComponents;
+
+        let filename_display_preference =
+            tcx.sess.filename_display_preference(RemapPathScopeComponents::DEBUGINFO);
 
         let producer = producer(tcx.sess);
-        let comp_dir = tcx
-            .sess
-            .opts
-            .working_dir
-            .to_string_lossy(if should_remap_filepaths {
-                FileNameDisplayPreference::Remapped
-            } else {
-                FileNameDisplayPreference::Local
-            })
-            .into_owned();
+        let comp_dir =
+            tcx.sess.opts.working_dir.to_string_lossy(filename_display_preference).to_string();
+
         let (name, file_info) = match tcx.sess.local_crate_source_file() {
             Some(path) => {
-                let name = path.to_string_lossy().into_owned();
+                let name = path.to_string_lossy(filename_display_preference).to_string();
                 (name, None)
             }
             None => (tcx.crate_name(LOCAL_CRATE).to_string(), None),
@@ -156,7 +152,7 @@ impl DebugContext {
             stack_pointer_register,
             namespace_map: DefIdMap::default(),
             array_size_type,
-            should_remap_filepaths,
+            filename_display_preference,
         }
     }